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coreboot-kgpe-d16/util/romcc/romcc.c

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#include <stdarg.h>
#include <errno.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>
#define DEBUG_ERROR_MESSAGES 0
#define DEBUG_COLOR_GRAPH 0
#define DEBUG_SCC 0
#define X86_4_8BIT_GPRS 1
#warning "FIXME static constant variables"
#warning "FIXME enable pointers"
#warning "FIXME enable string constants"
/* Control flow graph of a loop without goto.
*
* AAA
* +---/
* /
* / +--->CCC
* | | / \
* | | DDD EEE break;
* | | \ \
* | | FFF \
* \| / \ \
* |\ GGG HHH | continue;
* | \ \ | |
* | \ III | /
* | \ | / /
* | vvv /
* +----BBB /
* | /
* vv
* JJJ
*
*
* AAA
* +-----+ | +----+
* | \ | / |
* | BBB +-+ |
* | / \ / | |
* | CCC JJJ / /
* | / \ / /
* | DDD EEE / /
* | | +-/ /
* | FFF /
* | / \ /
* | GGG HHH /
* | | +-/
* | III
* +--+
*
*
* DFlocal(X) = { Y <- Succ(X) | idom(Y) != X }
* DFup(Z) = { Y <- DF(Z) | idom(Y) != X }
*
*
* [] == DFlocal(X) U DF(X)
* () == DFup(X)
*
* Dominator graph of the same nodes.
*
* AAA AAA: [ ] ()
* / \
* BBB JJJ BBB: [ JJJ ] ( JJJ ) JJJ: [ ] ()
* |
* CCC CCC: [ ] ( BBB, JJJ )
* / \
* DDD EEE DDD: [ ] ( BBB ) EEE: [ JJJ ] ()
* |
* FFF FFF: [ ] ( BBB )
* / \
* GGG HHH GGG: [ ] ( BBB ) HHH: [ BBB ] ()
* |
* III III: [ BBB ] ()
*
*
* BBB and JJJ are definitely the dominance frontier.
* Where do I place phi functions and how do I make that decision.
*
*/
static void die(char *fmt, ...)
{
va_list args;
va_start(args, fmt);
vfprintf(stderr, fmt, args);
va_end(args);
fflush(stdout);
fflush(stderr);
exit(1);
}
#define MALLOC_STRONG_DEBUG
static void *xmalloc(size_t size, const char *name)
{
void *buf;
buf = malloc(size);
if (!buf) {
die("Cannot malloc %ld bytes to hold %s: %s\n",
size + 0UL, name, strerror(errno));
}
return buf;
}
static void *xcmalloc(size_t size, const char *name)
{
void *buf;
buf = xmalloc(size, name);
memset(buf, 0, size);
return buf;
}
static void xfree(const void *ptr)
{
free((void *)ptr);
}
static char *xstrdup(const char *str)
{
char *new;
int len;
len = strlen(str);
new = xmalloc(len + 1, "xstrdup string");
memcpy(new, str, len);
new[len] = '\0';
return new;
}
static void xchdir(const char *path)
{
if (chdir(path) != 0) {
die("chdir to %s failed: %s\n",
path, strerror(errno));
}
}
static int exists(const char *dirname, const char *filename)
{
int does_exist = 1;
xchdir(dirname);
if (access(filename, O_RDONLY) < 0) {
if ((errno != EACCES) && (errno != EROFS)) {
does_exist = 0;
}
}
return does_exist;
}
static char *slurp_file(const char *dirname, const char *filename, off_t *r_size)
{
int fd;
char *buf;
off_t size, progress;
ssize_t result;
struct stat stats;
if (!filename) {
*r_size = 0;
return 0;
}
xchdir(dirname);
fd = open(filename, O_RDONLY);
if (fd < 0) {
die("Cannot open '%s' : %s\n",
filename, strerror(errno));
}
result = fstat(fd, &stats);
if (result < 0) {
die("Cannot stat: %s: %s\n",
filename, strerror(errno));
}
size = stats.st_size;
*r_size = size +1;
buf = xmalloc(size +2, filename);
buf[size] = '\n'; /* Make certain the file is newline terminated */
buf[size+1] = '\0'; /* Null terminate the file for good measure */
progress = 0;
while(progress < size) {
result = read(fd, buf + progress, size - progress);
if (result < 0) {
if ((errno == EINTR) || (errno == EAGAIN))
continue;
die("read on %s of %ld bytes failed: %s\n",
filename, (size - progress)+ 0UL, strerror(errno));
}
progress += result;
}
result = close(fd);
if (result < 0) {
die("Close of %s failed: %s\n",
filename, strerror(errno));
}
return buf;
}
/* Long on the destination platform */
typedef unsigned long ulong_t;
typedef long long_t;
struct file_state {
struct file_state *prev;
const char *basename;
char *dirname;
char *buf;
off_t size;
char *pos;
int line;
char *line_start;
};
struct hash_entry;
struct token {
int tok;
struct hash_entry *ident;
int str_len;
union {
ulong_t integer;
const char *str;
} val;
};
/* I have two classes of types:
* Operational types.
* Logical types. (The type the C standard says the operation is of)
*
* The operational types are:
* chars
* shorts
* ints
* longs
*
* floats
* doubles
* long doubles
*
* pointer
*/
/* Machine model.
* No memory is useable by the compiler.
* There is no floating point support.
* All operations take place in general purpose registers.
* There is one type of general purpose register.
* Unsigned longs are stored in that general purpose register.
*/
/* Operations on general purpose registers.
*/
#define OP_SMUL 0
#define OP_UMUL 1
#define OP_SDIV 2
#define OP_UDIV 3
#define OP_SMOD 4
#define OP_UMOD 5
#define OP_ADD 6
#define OP_SUB 7
#define OP_SL 8
#define OP_USR 9
#define OP_SSR 10
#define OP_AND 11
#define OP_XOR 12
#define OP_OR 13
#define OP_POS 14 /* Dummy positive operator don't use it */
#define OP_NEG 15
#define OP_INVERT 16
#define OP_EQ 20
#define OP_NOTEQ 21
#define OP_SLESS 22
#define OP_ULESS 23
#define OP_SMORE 24
#define OP_UMORE 25
#define OP_SLESSEQ 26
#define OP_ULESSEQ 27
#define OP_SMOREEQ 28
#define OP_UMOREEQ 29
#define OP_LFALSE 30 /* Test if the expression is logically false */
#define OP_LTRUE 31 /* Test if the expression is logcially true */
#define OP_LOAD 32
#define OP_STORE 33
#define OP_NOOP 34
#define OP_MIN_CONST 50
#define OP_MAX_CONST 59
#define IS_CONST_OP(X) (((X) >= OP_MIN_CONST) && ((X) <= OP_MAX_CONST))
#define OP_INTCONST 50
#define OP_BLOBCONST 51
/* For OP_BLOBCONST triple->type holds the layout and size
* information. u.blob holds a pointer to the raw binary
* data for the constant initializer.
*/
#define OP_ADDRCONST 52
/* For OP_ADDRCONST triple->type holds the type.
* triple->left holds the reference to the static variable.
* triple->u.cval holds an offset from that value.
*/
#define OP_WRITE 60
/* OP_WRITE moves one pseudo register to another.
* triple->left holds the destination pseudo register,
* must be an OP_DECL.
* triple->right holds the psuedo to move.
*/
#define OP_READ 61
/* OP_READ reads the value of a variable and makes
* it available for the pseudo operation.
* Useful for things like def-use chains.
* triple->left holds points to the triple to read from.
*/
#define OP_COPY 62
/* OP_COPY makes a copy of the psedo register or constant in op->left.
*/
/* Hard operations that I don't know if they are worth supporting */
#define OP_DEREF 65
/* OP_DEREF generates an lvalue from a pointer.
* triple->left holds the pointer value.
* OP_DEREF serves as a place holder to indicate all necessary
* checks have been done to indicate a value is an lvalue.
*/
#define OP_DOT 66
#define OP_VAL 67
/* OP_VAL returns the value of a subexpression of the current expression.
* Useful for operators that have side effects.
* triple->left holds the expression.
* triple->right holds the subexpression of triple->left that is the
* value of the expression.
*
* Not seen outside of expressions.
*/
#define OP_LAND 68
/* OP_LAND performs a C logical and between triple->left and triple->right.
* Not seen outside of expressions.
*/
#define OP_LOR 69
/* OP_LOR performs a C logical or between triple->left and triple->right.
* Not seen outside of expressions.
*/
#define OP_COND 70
/* OP_CODE performas a C ? : operation.
* triple->left holds the test.
* triple->right holds an OP_PRODUCT triple.
* triple->right->left holds the expression to evaluate if
* the test returns true.
* triple->right->right holds the expression to evaluate if
* the test returns false.
* Not seen outside of expressions.
*/
#define OP_COMMA 71
/* OP_COMMA performacs a C comma operation.
* That is triple->left is evaluated, then triple->right
* and the value of triple->right is returned.
* Not seen outside of expressions.
*/
#define OP_CALL 72
/* OP_CALL performs a procedure call.
* triple->left holda a pointer to the OP_LIST of a function
* triple->right holds a pointer either a single argument
* or a list of arguments. The list is formed by inserting
* OP_PRODUCT triples inbetween the argument values.
* Currently not seen outside of expressions.
*/
#define OP_PRODUCT 73
/* OP_PRODUCT is a utility triple, both triple->left and triple->right
* are used. Other opcodes OP_CALL, and OP_COND use it increase
* the number of triple pointers in a triple.
* Currently Not seen outside of expressions.
*/
/* statements */
#define OP_LIST 80
/* OP_LIST Holds a list of statements, and a result value.
* triple->left holds the list of statements.
* triple->right holds the value of the statements.
* triple->right must be the last statement in the list.
*/
#define OP_BRANCH 81 /* branch */
/* For branch instructions
* triple->left holds the branch target.
* triple->right holds the branch condition.
* triple->next holds where to branch to if the branch is not taken.
* The branch target can only be a decl...
*/
#define OP_LABEL 83
/* OP_LABEL is a triple that establishes an target for branches.
* triple->use is the list of all branches that use this label.
*/
#define OP_ADECL 84
/* OP_DECL is a triple that establishes an lvalue for assignments.
* triple->use is a list of statements that use the variable.
*/
#define OP_SDECL 85
/* OP_VAR is a triple that establishes a variable of static
* storage duration.
* triple->use is a list of statements that use the variable.
* triple->left holds the initializer expression.
*/
#define OP_PHI 86
/* OP_PHI is a triple used in SSA form code.
* It is used when multiple code paths merge and a variable needs
* a single assignment from any of those code paths.
* The operation is a cross between OP_DECL and OP_WRITE, which
* is what OP_PHI is geneared from.
*
* triple->left points to an array of pointers to triple.
* The size of the array is the number of control paths into the block
* in which OP_PHI resides. The elements of the array point to point
* to the variables OP_PHI is derived from.
*
* triple->right holds a pointer to the original OP_DECL node
*/
/* Architecture specific instructions */
#define OP_CMP 100
#define OP_TEST 101
#define OP_SET_EQ 102
#define OP_SET_NOTEQ 103
#define OP_SET_SLESS 104
#define OP_SET_ULESS 105
#define OP_SET_SMORE 106
#define OP_SET_UMORE 107
#define OP_SET_SLESSEQ 108
#define OP_SET_ULESSEQ 109
#define OP_SET_SMOREEQ 110
#define OP_SET_UMOREEQ 111
#define OP_JMP 112
#define OP_JMP_EQ 113
#define OP_JMP_NOTEQ 114
#define OP_JMP_SLESS 115
#define OP_JMP_ULESS 116
#define OP_JMP_SMORE 117
#define OP_JMP_UMORE 118
#define OP_JMP_SLESSEQ 119
#define OP_JMP_ULESSEQ 120
#define OP_JMP_SMOREEQ 121
#define OP_JMP_UMOREEQ 122
/* Builtin operators that it is just simpler to use the compiler for */
#define OP_INB 130
#define OP_INW 131
#define OP_INL 132
#define OP_OUTB 133
#define OP_OUTW 134
#define OP_OUTL 135
#define OP_BSF 136
#define OP_BSR 137
#warning "FIXME implement rdmsr wrmsr"
#if 0
/* I need to implement these but, I need to implment > 32bit return
* values first.
*/
#define OP_RDMSR 138
#define OP_WRMSR 139
#endif
#define OP_HLT 140
static const char *table_ops[] = {
[OP_SMUL ] = "smul",
[OP_UMUL ] = "umul",
[OP_SDIV ] = "sdiv",
[OP_UDIV ] = "udiv",
[OP_SMOD ] = "smod",
[OP_UMOD ] = "umod",
[OP_ADD ] = "add",
[OP_SUB ] = "sub",
[OP_SL ] = "sl",
[OP_USR ] = "usr",
[OP_SSR ] = "ssr",
[OP_AND ] = "and",
[OP_XOR ] = "xor",
[OP_OR ] = "or",
[OP_POS ] = "pos",
[OP_NEG ] = "neg",
[OP_INVERT ] = "invert",
[OP_EQ ] = "eq",
[OP_NOTEQ ] = "noteq",
[OP_SLESS ] = "sless",
[OP_ULESS ] = "uless",
[OP_SMORE ] = "smore",
[OP_UMORE ] = "umore",
[OP_SLESSEQ ] = "slesseq",
[OP_ULESSEQ ] = "ulesseq",
[OP_SMOREEQ ] = "smoreeq",
[OP_UMOREEQ ] = "umoreeq",
[OP_LFALSE ] = "lfalse",
[OP_LTRUE ] = "ltrue",
[OP_LOAD ] = "load",
[OP_STORE ] = "store",
[OP_NOOP ] = "noop",
[OP_INTCONST ] = "intconst",
[OP_BLOBCONST ] = "blobconst",
[OP_ADDRCONST ] = "addrconst",
[OP_WRITE ] = "write",
[OP_READ ] = "read",
[OP_COPY ] = "copy",
[OP_DEREF ] = "deref",
[OP_DOT ] = "dot",
[OP_VAL ] = "val",
[OP_LAND ] = "land",
[OP_LOR ] = "lor",
[OP_COND ] = "cond",
[OP_COMMA ] = "comma",
[OP_CALL ] = "call",
[OP_PRODUCT ] = "product",
[OP_LIST ] = "list",
[OP_BRANCH ] = "branch",
[OP_LABEL ] = "label",
[OP_ADECL ] = "adecl",
[OP_SDECL ] = "sdecl",
[OP_PHI ] = "phi",
[OP_CMP ] = "cmp",
[OP_TEST ] = "test",
[OP_SET_EQ ] = "set_eq",
[OP_SET_NOTEQ ] = "set_noteq",
[OP_SET_SLESS ] = "set_sless",
[OP_SET_ULESS ] = "set_uless",
[OP_SET_SMORE ] = "set_smore",
[OP_SET_SMORE ] = "set_umore",
[OP_SET_SLESSEQ] = "set_slesseq",
[OP_SET_ULESSEQ] = "set_ulesseq",
[OP_SET_SMOREEQ] = "set_smoreq",
[OP_SET_UMOREEQ] = "set_umoreq",
[OP_JMP ] = "jmp",
[OP_JMP_EQ ] = "jmp_eq",
[OP_JMP_NOTEQ ] = "jmp_noteq",
[OP_JMP_SLESS ] = "jmp_sless",
[OP_JMP_ULESS ] = "jmp_uless",
[OP_JMP_SMORE ] = "jmp_smore",
[OP_JMP_SMORE ] = "jmp_umore",
[OP_JMP_SLESSEQ] = "jmp_slesseq",
[OP_JMP_ULESSEQ] = "jmp_ulesseq",
[OP_JMP_SMOREEQ] = "jmp_smoreq",
[OP_JMP_UMOREEQ] = "jmp_umoreq",
[OP_INB ] = "__inb",
[OP_INW ] = "__inw",
[OP_INL ] = "__inl",
[OP_OUTB ] = "__outb",
[OP_OUTW ] = "__outw",
[OP_OUTL ] = "__outl",
[OP_BSF ] = "__bsf",
[OP_BSR ] = "__bsr",
[OP_HLT ] = "__hlt",
};
#define OP_MAX (sizeof(table_ops)/sizeof(table_ops[0]))
static const char *tops(int index)
{
static const char unknown[] = "unknown op";
if (index < 0) {
return unknown;
}
if (index > OP_MAX) {
return unknown;
}
return table_ops[index];
}
#warning "FIXME Finish defining struct type"
struct triple;
struct block;
struct triple_set {
struct triple_set *next;
struct triple *member;
};
struct triple {
struct triple *next, *prev;
struct triple_set *use;
struct type *type;
int op;
unsigned id; /* A scratch value and finally the register */
struct triple *left;
struct triple *right;
union {
ulong_t cval;
struct block *block;
void *blob;
} u;
const char *filename;
int line;
int col;
};
struct block_set {
struct block_set *next;
struct block *member;
};
struct block {
struct block *work_next;
struct block *left, *right;
struct triple *first, *last;
int users;
struct block_set *use;
struct block_set *idominates;
struct block_set *domfrontier;
struct block *idom;
struct block_set *ipdominates;
struct block_set *ipdomfrontier;
struct block *ipdom;
int vertex;
};
struct symbol {
struct symbol *next;
struct hash_entry *ident;
struct triple *def;
struct type *type;
int scope_depth;
};
struct macro {
struct hash_entry *ident;
char *buf;
int buf_len;
};
struct hash_entry {
struct hash_entry *next;
const char *name;
int name_len;
int tok;
struct macro *sym_define;
struct symbol *sym_label;
struct symbol *sym_struct;
struct symbol *sym_ident;
};
#define HASH_TABLE_SIZE 2048
struct compile_state {
struct triple *vars;
struct file_state *file;
struct token token[4];
struct hash_entry *hash_table[HASH_TABLE_SIZE];
struct hash_entry *i_continue;
struct hash_entry *i_break;
int scope_depth;
int if_depth, if_value;
int macro_line;
struct file_state *macro_file;
struct triple *main_function;
struct block *first_block, *last_block;
int last_vertex;
int debug;
int optimize;
};
#define MAX_REGISTERS 75
#define MAX_REG_EQUIVS 16
#define MAX_REGC 12
#define REG_UNSET 0
/* Provision for 8 register classes */
#define REGC_MASK ((1 << MAX_REGC) - 1)
#define ID_REG_CLASSES(ID) ((ID) & REGC_MASK)
#define ID_REG(ID) ((ID) >> MAX_REGC)
#define MK_REG_ID(REG, CLASSES) (((REG) << MAX_REGC) | ((CLASSES) & REGC_MASK))
static unsigned alloc_virtual_reg(void)
{
static unsigned virtual_reg = MAX_REGISTERS;
virtual_reg += 1;
return virtual_reg;
}
static unsigned arch_reg_regcm(struct compile_state *state, int reg);
static void arch_reg_equivs(
struct compile_state *state, unsigned *equiv, int reg);
static int arch_select_free_register(
struct compile_state *state, char *used, int classes);
static unsigned arch_regc_size(struct compile_state *state, int class);
static int arch_regcm_intersect(unsigned regcm1, unsigned regcm2);
static unsigned arch_type_to_regcm(struct compile_state *state, struct type *type);
static const char *arch_reg_str(int reg);
#define DEBUG_INTERMEDIATE_CODE 0x0001
#define DEBUG_CONTROL_FLOW 0x0002
#define DEBUG_BASIC_BLOCKS 0x0004
#define DEBUG_FDOMINATORS 0x0008
#define DEBUG_RDOMINATORS 0x0010
#define DEBUG_TRIPLES 0x0020
#define DEBUG_INTERFERENCE 0x0040
#define DEBUG_ARCH_CODE 0x0080
#define DEBUG_CODE_ELIMINATION 0x0100
#define GLOBAL_SCOPE_DEPTH 1
static void compile_file(struct compile_state *old_state, char *filename, int local);
static int get_col(struct file_state *file)
{
int col;
char *ptr, *end;
ptr = file->line_start;
end = file->pos;
for(col = 0; ptr < end; ptr++) {
if (*ptr != '\t') {
col++;
}
else {
col = (col & ~7) + 8;
}
}
return col;
}
static void loc(FILE *fp, struct compile_state *state, struct triple *triple)
{
int col;
if (triple) {
fprintf(fp, "%s:%d.%d: ",
triple->filename, triple->line, triple->col);
return;
}
if (!state->file) {
return;
}
col = get_col(state->file);
fprintf(fp, "%s:%d.%d: ",
state->file->basename, state->file->line, col);
}
static void __internal_error(struct compile_state *state, struct triple *ptr,
char *fmt, ...)
{
va_list args;
va_start(args, fmt);
loc(stderr, state, ptr);
fprintf(stderr, "Internal compiler error: ");
vfprintf(stderr, fmt, args);
fprintf(stderr, "\n");
va_end(args);
abort();
}
static void __internal_warning(struct compile_state *state, struct triple *ptr,
char *fmt, ...)
{
va_list args;
va_start(args, fmt);
loc(stderr, state, ptr);
fprintf(stderr, "Internal compiler warning: ");
vfprintf(stderr, fmt, args);
fprintf(stderr, "\n");
va_end(args);
}
static void __error(struct compile_state *state, struct triple *ptr,
char *fmt, ...)
{
va_list args;
va_start(args, fmt);
loc(stderr, state, ptr);
vfprintf(stderr, fmt, args);
va_end(args);
fprintf(stderr, "\n");
exit(1);
}
static void __warning(struct compile_state *state, struct triple *ptr,
char *fmt, ...)
{
va_list args;
va_start(args, fmt);
loc(stderr, state, ptr);
fprintf(stderr, "warning: ");
vfprintf(stderr, fmt, args);
fprintf(stderr, "\n");
va_end(args);
}
#if DEBUG_ERROR_MESSAGES
# define internal_error fprintf(stderr, "@ %s.%s:%d \t", __FILE__, __func__, __LINE__),__internal_error
# define internal_warning fprintf(stderr, "@ %s.%s:%d \t", __FILE__, __func__, __LINE__),__internal_warning
# define error fprintf(stderr, "@ %s.%s:%d \t", __FILE__, __func__, __LINE__),__error
# define warning fprintf(stderr, "@ %s.%s:%d \t", __FILE__, __func__, __LINE__),__warning
#else
# define internal_error __internal_error
# define internal_warning __internal_warning
# define error __error
# define warning __warning
#endif
#define FINISHME() warning(state, 0, "FINISHME @ %s.%s:%d", __FILE__, __func__, __LINE__)
static void valid_op(struct compile_state *state, struct triple *ptr)
{
char *fmt = "invalid op: %d";
if (ptr->op >= OP_MAX) {
internal_error(state, 0, fmt, ptr->op);
}
if (ptr->op < 0) {
internal_error(state, 0, fmt, ptr->op);
}
}
static void process_trigraphs(struct compile_state *state)
{
char *src, *dest, *end;
struct file_state *file;
file = state->file;
src = dest = file->buf;
end = file->buf + file->size;
while((end - src) >= 3) {
if ((src[0] == '?') && (src[1] == '?')) {
int c = -1;
switch(src[2]) {
case '=': c = '#'; break;
case '/': c = '\\'; break;
case '\'': c = '^'; break;
case '(': c = '['; break;
case ')': c = ']'; break;
case '!': c = '!'; break;
case '<': c = '{'; break;
case '>': c = '}'; break;
case '-': c = '~'; break;
}
if (c != -1) {
*dest++ = c;
src += 3;
}
else {
*dest++ = *src++;
}
}
else {
*dest++ = *src++;
}
}
while(src != end) {
*dest++ = *src++;
}
file->size = dest - file->buf;
}
static void splice_lines(struct compile_state *state)
{
char *src, *dest, *end;
struct file_state *file;
file = state->file;
src = dest = file->buf;
end = file->buf + file->size;
while((end - src) >= 2) {
if ((src[0] == '\\') && (src[1] == '\n')) {
src += 2;
}
else {
*dest++ = *src++;
}
}
while(src != end) {
*dest++ = *src++;
}
file->size = dest - file->buf;
}
static struct type void_type;
static void use_triple(struct triple *used, struct triple *user)
{
struct triple_set **ptr, *new;
if (!used)
return;
if (!user)
return;
ptr = &used->use;
while(*ptr) {
if ((*ptr)->member == user) {
return;
}
ptr = &(*ptr)->next;
}
/* Append new to the head of the list,
* copy_func and rename_block_variables
* depends on this.
*/
new = xcmalloc(sizeof(*new), "triple_set");
new->member = user;
new->next = used->use;
used->use = new;
}
static void unuse_triple(struct triple *used, struct triple *unuser)
{
struct triple_set *use, **ptr;
ptr = &used->use;
while(*ptr) {
use = *ptr;
if (use->member == unuser) {
*ptr = use->next;
xfree(use);
}
else {
ptr = &use->next;
}
}
}
static void push_triple(struct triple *used, struct triple *user)
{
struct triple_set *new;
if (!used)
return;
if (!user)
return;
/* Append new to the head of the list,
* it's the only sensible behavoir for a stack.
*/
new = xcmalloc(sizeof(*new), "triple_set");
new->member = user;
new->next = used->use;
used->use = new;
}
static void pop_triple(struct triple *used, struct triple *unuser)
{
struct triple_set *use, **ptr;
ptr = &used->use;
while(*ptr) {
use = *ptr;
if (use->member == unuser) {
*ptr = use->next;
xfree(use);
/* Only free one occurance from the stack */
return;
}
else {
ptr = &use->next;
}
}
}
/* The zero triple is used as a place holder when we are removing pointers
* from a triple. Having allows certain sanity checks to pass even
* when the original triple that was pointed to is gone.
*/
static struct triple zero_triple = {
.next = &zero_triple,
.prev = &zero_triple,
.use = 0,
.op = OP_INTCONST,
.id = -1, /* An invalid id */
.left = 0,
.right = 0,
.u = { .cval = 0, },
.filename = __FILE__,
.line = __LINE__,
};
static struct triple *build_triple(struct compile_state *state,
int op, struct type *type, struct triple *left, struct triple *right,
const char *filename, int line, int col)
{
struct triple *ret;
ret = xcmalloc(sizeof(*ret), "tripple");
ret->op = op;
ret->type = type;
ret->left = left;
ret->right = right;
ret->next = ret;
ret->prev = ret;
ret->filename = filename;
ret->line = line;
ret->col = col;
return ret;
}
static struct triple *triple(struct compile_state *state,
int op, struct type *type, struct triple *left, struct triple *right)
{
struct triple *ret;
const char *filename;
int line, col;
filename = 0;
line = 0;
col = 0;
if (state->file) {
filename = state->file->basename;
line = state->file->line;
col = get_col(state->file);
}
ret = build_triple(state, op, type, left, right, filename, line, col);
/* record the branch target was used */
if (ret->op == OP_BRANCH) {
if (!left || (left->op != OP_LABEL)) {
internal_error(state, 0, "branch not to label");
}
use_triple(left, ret);
}
return ret;
}
static void insert_triple(struct compile_state *state,
struct triple *first, struct triple *ptr)
{
if (ptr) {
if (ptr->next != ptr) {
internal_error(state, ptr, "expression already used");
}
ptr->next = first;
ptr->prev = first->prev;
ptr->prev->next = ptr;
ptr->next->prev = ptr;
if ((ptr->prev->op == OP_BRANCH) && (ptr->prev->right)) {
unuse_triple(first, ptr->prev);
use_triple(ptr, ptr->prev);
}
}
}
static struct triple *pre_triple(struct compile_state *state,
struct triple *base,
int op, struct type *type, struct triple *left, struct triple *right)
{
/* Careful this assumes it can do the easy thing to get the block */
struct triple *ret;
ret = build_triple(state, op, type, left, right,
base->filename, base->line, base->col);
ret->u.block = base->u.block;
insert_triple(state, base, ret);
return ret;
}
static struct triple *post_triple(struct compile_state *state,
struct triple *base,
int op, struct type *type, struct triple *left, struct triple *right)
{
/* Careful this assumes it can do the easy thing to get the block */
struct triple *ret;
ret = build_triple(state, op, type, left, right,
base->filename, base->line, base->col);
ret->u.block = base->u.block;
insert_triple(state, base->next, ret);
return ret;
}
static struct triple *label(struct compile_state *state)
{
/* Labels don't get a type */
struct triple *result;
result = triple(state, OP_LABEL, &void_type, 0, 0);
return result;
}
static int triple_is_pure(struct compile_state *state, struct triple *ins)
{
/* Does the triple have no side effects.
* I.e. Rexecuting the triple with the same arguments
* gives the same value.
*/
int pure;
switch(ins->op) {
case OP_SMUL: case OP_UMUL:
case OP_SDIV: case OP_UDIV:
case OP_SMOD: case OP_UMOD:
case OP_ADD: case OP_SUB:
case OP_SL:
case OP_USR: case OP_SSR:
case OP_AND:
case OP_XOR:
case OP_OR:
case OP_POS: case OP_NEG:
case OP_INVERT:
case OP_EQ: case OP_NOTEQ:
case OP_SLESS: case OP_ULESS: case OP_SMORE: case OP_UMORE:
case OP_SLESSEQ: case OP_ULESSEQ: case OP_SMOREEQ: case OP_UMOREEQ:
case OP_LFALSE: case OP_LTRUE:
case OP_NOOP:
case OP_INTCONST:
case OP_BLOBCONST:
case OP_ADDRCONST:
case OP_WRITE:
case OP_READ:
case OP_COPY:
case OP_BRANCH:
case OP_LABEL:
case OP_ADECL:
case OP_SDECL:
case OP_PHI:
case OP_CMP:
case OP_TEST:
case OP_SET_EQ: case OP_SET_NOTEQ:
case OP_SET_SLESS: case OP_SET_ULESS:
case OP_SET_SMORE: case OP_SET_UMORE:
case OP_SET_SLESSEQ: case OP_SET_ULESSEQ:
case OP_SET_SMOREEQ: case OP_SET_UMOREEQ:
case OP_JMP:
case OP_JMP_EQ: case OP_JMP_NOTEQ:
case OP_JMP_SLESS: case OP_JMP_ULESS:
case OP_JMP_SMORE: case OP_JMP_UMORE:
case OP_JMP_SLESSEQ: case OP_JMP_ULESSEQ:
case OP_JMP_SMOREEQ: case OP_JMP_UMOREEQ:
case OP_BSF: case OP_BSR:
pure = 1;
break;
case OP_LOAD: case OP_STORE:
case OP_INB: case OP_INW: case OP_INL:
case OP_OUTB: case OP_OUTW: case OP_OUTL:
case OP_HLT:
pure = 0;
break;
default:
internal_error(state, ins, "purity of %s not known",
tops(ins->op));
pure = 0;
break;
}
return pure;
}
static int triple_is_branch(struct triple *ins)
{
/* This function is used to determine which triples need
* a register.
*/
int is_branch = 0;
switch(ins->op) {
case OP_BRANCH:
case OP_JMP:
case OP_JMP_EQ: case OP_JMP_NOTEQ:
case OP_JMP_SLESS: case OP_JMP_ULESS:
case OP_JMP_SMORE: case OP_JMP_UMORE:
case OP_JMP_SLESSEQ: case OP_JMP_ULESSEQ:
case OP_JMP_SMOREEQ: case OP_JMP_UMOREEQ:
is_branch = 1;
break;
}
return is_branch;
}
static int triple_is_def(struct triple *ins)
{
/* This function is used to determine which triples need
* a register.
*/
int is_def = 1;
switch(ins->op) {
case OP_ADECL:
case OP_SDECL:
case OP_LABEL:
case OP_INTCONST:
case OP_BLOBCONST:
case OP_ADDRCONST:
case OP_STORE:
case OP_WRITE:
case OP_NOOP:
case OP_OUTB: case OP_OUTW: case OP_OUTL:
case OP_BRANCH:
case OP_JMP:
case OP_JMP_EQ: case OP_JMP_NOTEQ:
case OP_JMP_SLESS: case OP_JMP_ULESS:
case OP_JMP_SMORE: case OP_JMP_UMORE:
case OP_JMP_SLESSEQ: case OP_JMP_ULESSEQ:
case OP_JMP_SMOREEQ: case OP_JMP_UMOREEQ:
is_def = 0;
break;
}
return is_def;
}
static struct triple **triple_targ(struct compile_state *state,
struct triple *triple, struct triple **last)
{
struct triple **ret;
ret = 0;
switch(triple->op) {
case OP_BRANCH:
case OP_JMP:
case OP_JMP_EQ: case OP_JMP_NOTEQ:
case OP_JMP_SLESS: case OP_JMP_ULESS:
case OP_JMP_SMORE: case OP_JMP_UMORE:
case OP_JMP_SLESSEQ: case OP_JMP_ULESSEQ:
case OP_JMP_SMOREEQ: case OP_JMP_UMOREEQ:
if (!last) {
ret = &triple->left;
}
else if ((last == &triple->left) && triple->right) {
ret = &triple->next;
}
break;
}
return ret;
}
static struct triple **triple_rhs(struct compile_state *state,
struct triple *triple, struct triple **last)
{
struct triple **ret;
ret = 0;
switch(triple->op) {
/* binary operations */
case OP_SMUL: case OP_UMUL: case OP_SDIV: case OP_UDIV:
case OP_SMOD: case OP_UMOD: case OP_ADD: case OP_SUB:
case OP_SL: case OP_USR: case OP_SSR: case OP_AND:
case OP_XOR: case OP_OR: case OP_EQ: case OP_NOTEQ:
case OP_SLESS: case OP_ULESS: case OP_SMORE: case OP_UMORE:
case OP_SLESSEQ: case OP_ULESSEQ: case OP_SMOREEQ: case OP_UMOREEQ:
case OP_CMP:
case OP_OUTB: case OP_OUTW: case OP_OUTL:
#if 0
if (!triple->left) {
internal_error(state, triple, "left arg missing");
}
if (!triple->right) {
internal_error(state, triple, "right arg missing");
}
#endif
if (!last) {
ret = &triple->left;
}
else if (last == &triple->left){
ret = &triple->right;
}
break;
/* unary operations */
case OP_POS: case OP_NEG:
case OP_INVERT: case OP_LFALSE: case OP_LTRUE:
case OP_COPY:
case OP_TEST:
case OP_SET_EQ: case OP_SET_NOTEQ:
case OP_SET_SLESS: case OP_SET_ULESS:
case OP_SET_SMORE: case OP_SET_UMORE:
case OP_SET_SLESSEQ: case OP_SET_ULESSEQ:
case OP_SET_SMOREEQ: case OP_SET_UMOREEQ:
case OP_INB: case OP_INW: case OP_INL:
case OP_BSF: case OP_BSR:
#if 0
if (!triple->left) {
internal_error(state, triple, "left arg missing");
}
if (triple->right) {
internal_error(state, triple, "right arg present");
}
#endif
if (!last) {
ret = &triple->left;
}
break;
/* Writes */
case OP_WRITE:
case OP_STORE:
if (!last) {
ret = &triple->right;
}
break;
/* Reads */
case OP_READ:
if (!last) {
ret = &triple->left;
}
break;
/* Branches */
case OP_BRANCH:
case OP_JMP:
case OP_JMP_EQ: case OP_JMP_NOTEQ:
case OP_JMP_SLESS: case OP_JMP_ULESS:
case OP_JMP_SMORE: case OP_JMP_UMORE:
case OP_JMP_SLESSEQ: case OP_JMP_ULESSEQ:
case OP_JMP_SMOREEQ: case OP_JMP_UMOREEQ:
if (!last && triple->right) {
ret = &triple->right;
}
break;
/* Phi... */
case OP_PHI:
{
struct triple **slot;
struct block *block;
block = triple->u.block;
slot = (struct triple **)(triple->left);
if (!last) {
ret = slot;
}
else if ((last >= slot) && (last < (slot + block->users -1))) {
ret = last + 1;
}
break;
}
/* Loads */
case OP_LOAD:
/* address constant.. */
case OP_ADDRCONST:
if (!last) {
ret = &triple->left;
}
break;
/* Stores */
break;
/* Variables and labels */
case OP_ADECL: case OP_SDECL: case OP_LABEL:
/* Constants */
case OP_INTCONST:
case OP_BLOBCONST:
case OP_NOOP:
case OP_HLT:
/* These operations that have no rhs expression */
break;
default:
internal_error(state, 0, "unknown expression type: %d %s",
triple->op, tops(triple->op));
break;
}
return ret;
}
static struct triple **triple_lhs(struct compile_state *state,
struct triple *triple, struct triple **last)
{
struct triple **ret;
ret = 0;
switch(triple->op) {
/* binary operations */
case OP_SMUL: case OP_UMUL: case OP_SDIV: case OP_UDIV:
case OP_SMOD: case OP_UMOD: case OP_ADD: case OP_SUB:
case OP_SL: case OP_USR: case OP_SSR: case OP_AND:
case OP_XOR: case OP_OR: case OP_EQ: case OP_NOTEQ:
case OP_SLESS: case OP_ULESS: case OP_SMORE: case OP_UMORE:
case OP_SLESSEQ: case OP_ULESSEQ: case OP_SMOREEQ: case OP_UMOREEQ:
case OP_CMP:
case OP_OUTB: case OP_OUTW: case OP_OUTL:
/* unary operations */
case OP_POS: case OP_NEG:
case OP_INVERT: case OP_LFALSE: case OP_LTRUE:
case OP_COPY:
case OP_TEST:
case OP_SET_EQ: case OP_SET_NOTEQ:
case OP_SET_SLESS: case OP_SET_ULESS:
case OP_SET_SMORE: case OP_SET_UMORE:
case OP_SET_SLESSEQ: case OP_SET_ULESSEQ:
case OP_SET_SMOREEQ: case OP_SET_UMOREEQ:
case OP_INB: case OP_INW: case OP_INL:
case OP_BSF: case OP_BSR:
/* Variable reads */
case OP_READ: case OP_PHI:
/* Branches */
case OP_BRANCH:
case OP_JMP:
case OP_JMP_EQ: case OP_JMP_NOTEQ:
case OP_JMP_SLESS: case OP_JMP_ULESS:
case OP_JMP_SMORE: case OP_JMP_UMORE:
case OP_JMP_SLESSEQ: case OP_JMP_ULESSEQ:
case OP_JMP_SMOREEQ: case OP_JMP_UMOREEQ:
/* Loads */
case OP_LOAD:
/* Address constants */
case OP_ADDRCONST:
/* Variables and labels */
case OP_ADECL: case OP_SDECL: case OP_LABEL:
/* Constants */
case OP_INTCONST:
case OP_BLOBCONST:
case OP_NOOP:
case OP_HLT:
/* These expressions have no lhs expression */
break;
/* Writes */
case OP_WRITE:
/* Stores */
case OP_STORE:
if (!last) {
ret = &triple->left;
}
break;
default:
internal_error(state, 0, "unknown expression type: %d %s",
triple->op, tops(triple->op));
break;
}
return ret;
}
static void free_triple(struct compile_state *state, struct triple *ptr)
{
ptr->prev->next = ptr->next;
ptr->next->prev = ptr->prev;
if (ptr->use) {
internal_error(state, ptr, "ptr->use != 0");
}
if (ptr->op == OP_PHI) {
xfree(ptr->left);
}
memset(ptr, -1, sizeof(*ptr));
xfree(ptr);
}
static void release_triple(struct compile_state *state, struct triple *ptr)
{
struct triple_set *set, *next;
struct triple **expr;
/* Remove ptr from use chains where it is the user */
expr = triple_rhs(state, ptr, 0);
for(; expr; expr = triple_rhs(state, ptr, expr)) {
if (*expr) {
unuse_triple(*expr, ptr);
}
}
expr = triple_lhs(state, ptr, 0);
for(; expr; expr = triple_lhs(state, ptr, expr)) {
if (*expr) {
unuse_triple(*expr, ptr);
}
}
expr = triple_targ(state, ptr, 0);
for(; expr; expr = triple_targ(state, ptr, expr)) {
if (*expr) {
unuse_triple(*expr, ptr);
}
}
/* Reomve ptr from use chains where it is used */
for(set = ptr->use; set; set = next) {
next = set->next;
expr = triple_rhs(state, set->member, 0);
for(; expr; expr = triple_rhs(state, set->member, expr)) {
if (*expr == ptr) {
*expr = &zero_triple;
}
}
expr = triple_lhs(state, set->member, 0);
for(; expr; expr = triple_lhs(state, set->member, expr)) {
if (*expr == ptr) {
*expr = &zero_triple;
}
}
expr = triple_targ(state, set->member, 0);
for(; expr; expr = triple_targ(state, set->member, expr)) {
if (*expr == ptr) {
*expr = &zero_triple;
}
}
unuse_triple(ptr, set->member);
}
free_triple(state, ptr);
}
static void print_triple(struct compile_state *state, struct triple *ptr);
#define TOK_UNKNOWN 0
#define TOK_SPACE 1
#define TOK_SEMI 2
#define TOK_LBRACE 3
#define TOK_RBRACE 4
#define TOK_COMMA 5
#define TOK_EQ 6
#define TOK_COLON 7
#define TOK_LBRACKET 8
#define TOK_RBRACKET 9
#define TOK_LPAREN 10
#define TOK_RPAREN 11
#define TOK_STAR 12
#define TOK_DOTS 13
#define TOK_MORE 14
#define TOK_LESS 15
#define TOK_TIMESEQ 16
#define TOK_DIVEQ 17
#define TOK_MODEQ 18
#define TOK_PLUSEQ 19
#define TOK_MINUSEQ 20
#define TOK_SLEQ 21
#define TOK_SREQ 22
#define TOK_ANDEQ 23
#define TOK_XOREQ 24
#define TOK_OREQ 25
#define TOK_EQEQ 26
#define TOK_NOTEQ 27
#define TOK_QUEST 28
#define TOK_LOGOR 29
#define TOK_LOGAND 30
#define TOK_OR 31
#define TOK_AND 32
#define TOK_XOR 33
#define TOK_LESSEQ 34
#define TOK_MOREEQ 35
#define TOK_SL 36
#define TOK_SR 37
#define TOK_PLUS 38
#define TOK_MINUS 39
#define TOK_DIV 40
#define TOK_MOD 41
#define TOK_PLUSPLUS 42
#define TOK_MINUSMINUS 43
#define TOK_BANG 44
#define TOK_ARROW 45
#define TOK_DOT 46
#define TOK_TILDE 47
#define TOK_LIT_STRING 48
#define TOK_LIT_CHAR 49
#define TOK_LIT_INT 50
#define TOK_LIT_FLOAT 51
#define TOK_MACRO 52
#define TOK_CONCATENATE 53
#define TOK_IDENT 54
#define TOK_STRUCT_NAME 55
#define TOK_ENUM_CONST 56
#define TOK_TYPE_NAME 57
#define TOK_AUTO 58
#define TOK_BREAK 59
#define TOK_CASE 60
#define TOK_CHAR 61
#define TOK_CONST 62
#define TOK_CONTINUE 63
#define TOK_DEFAULT 64
#define TOK_DO 65
#define TOK_DOUBLE 66
#define TOK_ELSE 67
#define TOK_ENUM 68
#define TOK_EXTERN 69
#define TOK_FLOAT 70
#define TOK_FOR 71
#define TOK_GOTO 72
#define TOK_IF 73
#define TOK_INLINE 74
#define TOK_INT 75
#define TOK_LONG 76
#define TOK_REGISTER 77
#define TOK_RESTRICT 78
#define TOK_RETURN 79
#define TOK_SHORT 80
#define TOK_SIGNED 81
#define TOK_SIZEOF 82
#define TOK_STATIC 83
#define TOK_STRUCT 84
#define TOK_SWITCH 85
#define TOK_TYPEDEF 86
#define TOK_UNION 87
#define TOK_UNSIGNED 88
#define TOK_VOID 89
#define TOK_VOLATILE 90
#define TOK_WHILE 91
#define TOK_ASM 92
#define TOK_ATTRIBUTE 93
#define TOK_ALIGNOF 94
#define TOK_FIRST_KEYWORD TOK_AUTO
#define TOK_LAST_KEYWORD TOK_ALIGNOF
#define TOK_DEFINE 100
#define TOK_UNDEF 101
#define TOK_INCLUDE 102
#define TOK_LINE 103
#define TOK_ERROR 104
#define TOK_WARNING 105
#define TOK_PRAGMA 106
#define TOK_IFDEF 107
#define TOK_IFNDEF 108
#define TOK_ELIF 109
#define TOK_ENDIF 110
#define TOK_FIRST_MACRO TOK_DEFINE
#define TOK_LAST_MACRO TOK_ENDIF
#define TOK_EOF 111
static const char *tokens[] = {
[TOK_UNKNOWN ] = "unknown",
[TOK_SPACE ] = ":space:",
[TOK_SEMI ] = ";",
[TOK_LBRACE ] = "{",
[TOK_RBRACE ] = "}",
[TOK_COMMA ] = ",",
[TOK_EQ ] = "=",
[TOK_COLON ] = ":",
[TOK_LBRACKET ] = "[",
[TOK_RBRACKET ] = "]",
[TOK_LPAREN ] = "(",
[TOK_RPAREN ] = ")",
[TOK_STAR ] = "*",
[TOK_DOTS ] = "...",
[TOK_MORE ] = ">",
[TOK_LESS ] = "<",
[TOK_TIMESEQ ] = "*=",
[TOK_DIVEQ ] = "/=",
[TOK_MODEQ ] = "%=",
[TOK_PLUSEQ ] = "+=",
[TOK_MINUSEQ ] = "-=",
[TOK_SLEQ ] = "<<=",
[TOK_SREQ ] = ">>=",
[TOK_ANDEQ ] = "&=",
[TOK_XOREQ ] = "^=",
[TOK_OREQ ] = "|=",
[TOK_EQEQ ] = "==",
[TOK_NOTEQ ] = "!=",
[TOK_QUEST ] = "?",
[TOK_LOGOR ] = "||",
[TOK_LOGAND ] = "&&",
[TOK_OR ] = "|",
[TOK_AND ] = "&",
[TOK_XOR ] = "^",
[TOK_LESSEQ ] = "<=",
[TOK_MOREEQ ] = ">=",
[TOK_SL ] = "<<",
[TOK_SR ] = ">>",
[TOK_PLUS ] = "+",
[TOK_MINUS ] = "-",
[TOK_DIV ] = "/",
[TOK_MOD ] = "%",
[TOK_PLUSPLUS ] = "++",
[TOK_MINUSMINUS ] = "--",
[TOK_BANG ] = "!",
[TOK_ARROW ] = "->",
[TOK_DOT ] = ".",
[TOK_TILDE ] = "~",
[TOK_LIT_STRING ] = ":string:",
[TOK_IDENT ] = ":ident:",
[TOK_TYPE_NAME ] = ":typename:",
[TOK_LIT_CHAR ] = ":char:",
[TOK_LIT_INT ] = ":integer:",
[TOK_LIT_FLOAT ] = ":float:",
[TOK_MACRO ] = "#",
[TOK_CONCATENATE ] = "##",
[TOK_AUTO ] = "auto",
[TOK_BREAK ] = "break",
[TOK_CASE ] = "case",
[TOK_CHAR ] = "char",
[TOK_CONST ] = "const",
[TOK_CONTINUE ] = "continue",
[TOK_DEFAULT ] = "default",
[TOK_DO ] = "do",
[TOK_DOUBLE ] = "double",
[TOK_ELSE ] = "else",
[TOK_ENUM ] = "enum",
[TOK_EXTERN ] = "extern",
[TOK_FLOAT ] = "float",
[TOK_FOR ] = "for",
[TOK_GOTO ] = "goto",
[TOK_IF ] = "if",
[TOK_INLINE ] = "inline",
[TOK_INT ] = "int",
[TOK_LONG ] = "long",
[TOK_REGISTER ] = "register",
[TOK_RESTRICT ] = "restrict",
[TOK_RETURN ] = "return",
[TOK_SHORT ] = "short",
[TOK_SIGNED ] = "signed",
[TOK_SIZEOF ] = "sizeof",
[TOK_STATIC ] = "static",
[TOK_STRUCT ] = "struct",
[TOK_SWITCH ] = "switch",
[TOK_TYPEDEF ] = "typedef",
[TOK_UNION ] = "union",
[TOK_UNSIGNED ] = "unsigned",
[TOK_VOID ] = "void",
[TOK_VOLATILE ] = "volatile",
[TOK_WHILE ] = "while",
[TOK_ASM ] = "asm",
[TOK_ATTRIBUTE ] = "__attribute__",
[TOK_ALIGNOF ] = "__alignof__",
[TOK_DEFINE ] = "define",
[TOK_UNDEF ] = "undef",
[TOK_INCLUDE ] = "include",
[TOK_LINE ] = "line",
[TOK_ERROR ] = "error",
[TOK_WARNING ] = "warning",
[TOK_PRAGMA ] = "pragma",
[TOK_IFDEF ] = "ifdef",
[TOK_IFNDEF ] = "ifndef",
[TOK_ELIF ] = "elif",
[TOK_ENDIF ] = "endif",
[TOK_EOF ] = "EOF",
};
static unsigned int hash(const char *str, int str_len)
{
unsigned int hash;
const char *end;
end = str + str_len;
hash = 0;
for(; str < end; str++) {
hash = (hash *263) + *str;
}
hash = hash & (HASH_TABLE_SIZE -1);
return hash;
}
static struct hash_entry *lookup(
struct compile_state *state, const char *name, int name_len)
{
struct hash_entry *entry;
unsigned int index;
index = hash(name, name_len);
entry = state->hash_table[index];
while(entry &&
((entry->name_len != name_len) ||
(memcmp(entry->name, name, name_len) != 0))) {
entry = entry->next;
}
if (!entry) {
char *new_name;
/* Get a private copy of the name */
new_name = xmalloc(name_len + 1, "hash_name");
memcpy(new_name, name, name_len);
new_name[name_len] = '\0';
/* Create a new hash entry */
entry = xcmalloc(sizeof(*entry), "hash_entry");
entry->next = state->hash_table[index];
entry->name = new_name;
entry->name_len = name_len;
/* Place the new entry in the hash table */
state->hash_table[index] = entry;
}
return entry;
}
static void ident_to_keyword(struct compile_state *state, struct token *tk)
{
struct hash_entry *entry;
entry = tk->ident;
if (entry && ((entry->tok == TOK_TYPE_NAME) ||
(entry->tok == TOK_ENUM_CONST) ||
((entry->tok >= TOK_FIRST_KEYWORD) &&
(entry->tok <= TOK_LAST_KEYWORD)))) {
tk->tok = entry->tok;
}
}
static void ident_to_macro(struct compile_state *state, struct token *tk)
{
struct hash_entry *entry;
entry = tk->ident;
if (entry &&
(entry->tok >= TOK_FIRST_MACRO) &&
(entry->tok <= TOK_LAST_MACRO)) {
tk->tok = entry->tok;
}
}
static void hash_keyword(
struct compile_state *state, const char *keyword, int tok)
{
struct hash_entry *entry;
entry = lookup(state, keyword, strlen(keyword));
if (entry && entry->tok != TOK_UNKNOWN) {
die("keyword %s already hashed", keyword);
}
entry->tok = tok;
}
static void symbol(
struct compile_state *state, struct hash_entry *ident,
struct symbol **chain, struct triple *def, struct type *type)
{
struct symbol *sym;
if (*chain && ((*chain)->scope_depth == state->scope_depth)) {
error(state, 0, "%s already defined", ident->name);
}
sym = xcmalloc(sizeof(*sym), "symbol");
sym->ident = ident;
sym->def = def;
sym->type = type;
sym->scope_depth = state->scope_depth;
sym->next = *chain;
*chain = sym;
}
static void start_scope(struct compile_state *state)
{
state->scope_depth++;
}
static void end_scope_syms(struct symbol **chain, int depth)
{
struct symbol *sym, *next;
sym = *chain;
while(sym && (sym->scope_depth == depth)) {
next = sym->next;
xfree(sym);
sym = next;
}
*chain = sym;
}
static void end_scope(struct compile_state *state)
{
int i;
int depth;
/* Walk through the hash table and remove all symbols
* in the current scope.
*/
depth = state->scope_depth;
for(i = 0; i < HASH_TABLE_SIZE; i++) {
struct hash_entry *entry;
entry = state->hash_table[i];
while(entry) {
end_scope_syms(&entry->sym_label, depth);
end_scope_syms(&entry->sym_struct, depth);
end_scope_syms(&entry->sym_ident, depth);
entry = entry->next;
}
}
state->scope_depth = depth - 1;
}
static void register_keywords(struct compile_state *state)
{
hash_keyword(state, "auto", TOK_AUTO);
hash_keyword(state, "break", TOK_BREAK);
hash_keyword(state, "case", TOK_CASE);
hash_keyword(state, "char", TOK_CHAR);
hash_keyword(state, "const", TOK_CONST);
hash_keyword(state, "continue", TOK_CONTINUE);
hash_keyword(state, "default", TOK_DEFAULT);
hash_keyword(state, "do", TOK_DO);
hash_keyword(state, "double", TOK_DOUBLE);
hash_keyword(state, "else", TOK_ELSE);
hash_keyword(state, "enum", TOK_ENUM);
hash_keyword(state, "extern", TOK_EXTERN);
hash_keyword(state, "float", TOK_FLOAT);
hash_keyword(state, "for", TOK_FOR);
hash_keyword(state, "goto", TOK_GOTO);
hash_keyword(state, "if", TOK_IF);
hash_keyword(state, "inline", TOK_INLINE);
hash_keyword(state, "int", TOK_INT);
hash_keyword(state, "long", TOK_LONG);
hash_keyword(state, "register", TOK_REGISTER);
hash_keyword(state, "restrict", TOK_RESTRICT);
hash_keyword(state, "return", TOK_RETURN);
hash_keyword(state, "short", TOK_SHORT);
hash_keyword(state, "signed", TOK_SIGNED);
hash_keyword(state, "sizeof", TOK_SIZEOF);
hash_keyword(state, "static", TOK_STATIC);
hash_keyword(state, "struct", TOK_STRUCT);
hash_keyword(state, "switch", TOK_SWITCH);
hash_keyword(state, "typedef", TOK_TYPEDEF);
hash_keyword(state, "union", TOK_UNION);
hash_keyword(state, "unsigned", TOK_UNSIGNED);
hash_keyword(state, "void", TOK_VOID);
hash_keyword(state, "volatile", TOK_VOLATILE);
hash_keyword(state, "while", TOK_WHILE);
hash_keyword(state, "asm", TOK_ASM);
hash_keyword(state, "__attribute__", TOK_ATTRIBUTE);
hash_keyword(state, "__alignof__", TOK_ALIGNOF);
}
static void register_macro_keywords(struct compile_state *state)
{
hash_keyword(state, "define", TOK_DEFINE);
hash_keyword(state, "undef", TOK_UNDEF);
hash_keyword(state, "include", TOK_INCLUDE);
hash_keyword(state, "line", TOK_LINE);
hash_keyword(state, "error", TOK_ERROR);
hash_keyword(state, "warning", TOK_WARNING);
hash_keyword(state, "pragma", TOK_PRAGMA);
hash_keyword(state, "ifdef", TOK_IFDEF);
hash_keyword(state, "ifndef", TOK_IFNDEF);
hash_keyword(state, "elif", TOK_ELIF);
hash_keyword(state, "endif", TOK_ENDIF);
}
static int spacep(int c)
{
int ret = 0;
switch(c) {
case ' ':
case '\t':
case '\f':
case '\v':
case '\r':
case '\n':
ret = 1;
break;
}
return ret;
}
static int digitp(int c)
{
int ret = 0;
switch(c) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
ret = 1;
break;
}
return ret;
}
static int hexdigitp(int c)
{
int ret = 0;
switch(c) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
ret = 1;
break;
}
return ret;
}
static int hexdigval(int c)
{
int val = -1;
if ((c >= '0') && (c <= '9')) {
val = c - '0';
}
else if ((c >= 'A') && (c <= 'F')) {
val = 10 + (c - 'A');
}
else if ((c >= 'a') && (c <= 'f')) {
val = 10 + (c - 'a');
}
return val;
}
static int octdigitp(int c)
{
int ret = 0;
switch(c) {
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
ret = 1;
break;
}
return ret;
}
static int octdigval(int c)
{
int val = -1;
if ((c >= '0') && (c <= '7')) {
val = c - '0';
}
return val;
}
static int letterp(int c)
{
int ret = 0;
switch(c) {
case 'a': case 'b': case 'c': case 'd': case 'e':
case 'f': case 'g': case 'h': case 'i': case 'j':
case 'k': case 'l': case 'm': case 'n': case 'o':
case 'p': case 'q': case 'r': case 's': case 't':
case 'u': case 'v': case 'w': case 'x': case 'y':
case 'z':
case 'A': case 'B': case 'C': case 'D': case 'E':
case 'F': case 'G': case 'H': case 'I': case 'J':
case 'K': case 'L': case 'M': case 'N': case 'O':
case 'P': case 'Q': case 'R': case 'S': case 'T':
case 'U': case 'V': case 'W': case 'X': case 'Y':
case 'Z':
case '_':
ret = 1;
break;
}
return ret;
}
static int char_value(struct compile_state *state,
const signed char **strp, const signed char *end)
{
const signed char *str;
int c;
str = *strp;
c = *str++;
if ((c == '\\') && (str < end)) {
switch(*str) {
case 'n': c = '\n'; str++; break;
case 't': c = '\t'; str++; break;
case 'v': c = '\v'; str++; break;
case 'b': c = '\b'; str++; break;
case 'r': c = '\r'; str++; break;
case 'f': c = '\f'; str++; break;
case 'a': c = '\a'; str++; break;
case '\\': c = '\\'; str++; break;
case '?': c = '?'; str++; break;
case '\'': c = '\''; str++; break;
case '"': c = '"'; break;
case 'x':
c = 0;
str++;
while((str < end) && hexdigitp(*str)) {
c <<= 4;
c += hexdigval(*str);
str++;
}
break;
case '0': case '1': case '2': case '3':
case '4': case '5': case '6': case '7':
c = 0;
while((str < end) && octdigitp(*str)) {
c <<= 3;
c += octdigval(*str);
str++;
}
break;
default:
error(state, 0, "Invalid character constant");
break;
}
}
*strp = str;
return c;
}
static char *after_digits(char *ptr, char *end)
{
while((ptr < end) && digitp(*ptr)) {
ptr++;
}
return ptr;
}
static char *after_octdigits(char *ptr, char *end)
{
while((ptr < end) && octdigitp(*ptr)) {
ptr++;
}
return ptr;
}
static char *after_hexdigits(char *ptr, char *end)
{
while((ptr < end) && hexdigitp(*ptr)) {
ptr++;
}
return ptr;
}
static void save_string(struct compile_state *state,
struct token *tk, char *start, char *end, const char *id)
{
char *str;
int str_len;
/* Create a private copy of the string */
str_len = end - start + 1;
str = xmalloc(str_len + 1, id);
memcpy(str, start, str_len);
str[str_len] = '\0';
/* Store the copy in the token */
tk->val.str = str;
tk->str_len = str_len;
}
static void next_token(struct compile_state *state, int index)
{
struct file_state *file;
struct token *tk;
char *token;
int c, c1, c2, c3;
char *tokp, *end;
int tok;
next_token:
file = state->file;
tk = &state->token[index];
tk->str_len = 0;
tk->ident = 0;
token = tokp = file->pos;
end = file->buf + file->size;
tok = TOK_UNKNOWN;
c = -1;
if (tokp < end) {
c = *tokp;
}
c1 = -1;
if ((tokp + 1) < end) {
c1 = tokp[1];
}
c2 = -1;
if ((tokp + 2) < end) {
c2 = tokp[2];
}
c3 = -1;
if ((tokp + 3) < end) {
c3 = tokp[3];
}
if (tokp >= end) {
tok = TOK_EOF;
tokp = end;
}
/* Whitespace */
else if (spacep(c)) {
tok = TOK_SPACE;
while ((tokp < end) && spacep(c)) {
if (c == '\n') {
file->line++;
file->line_start = tokp + 1;
}
c = *(++tokp);
}
if (!spacep(c)) {
tokp--;
}
}
/* EOL Comments */
else if ((c == '/') && (c1 == '/')) {
tok = TOK_SPACE;
for(tokp += 2; tokp < end; tokp++) {
c = *tokp;
if (c == '\n') {
file->line++;
file->line_start = tokp +1;
break;
}
}
}
/* Comments */
else if ((c == '/') && (c1 == '*')) {
int line;
char *line_start;
line = file->line;
line_start = file->line_start;
for(tokp += 2; (end - tokp) >= 2; tokp++) {
c = *tokp;
if (c == '\n') {
line++;
line_start = tokp +1;
}
else if ((c == '*') && (tokp[1] == '/')) {
tok = TOK_SPACE;
tokp += 1;
break;
}
}
if (tok == TOK_UNKNOWN) {
error(state, 0, "unterminated comment");
}
file->line = line;
file->line_start = line_start;
}
/* string constants */
else if ((c == '"') ||
((c == 'L') && (c1 == '"'))) {
int line;
char *line_start;
int wchar;
line = file->line;
line_start = file->line_start;
wchar = 0;
if (c == 'L') {
wchar = 1;
tokp++;
}
for(tokp += 1; tokp < end; tokp++) {
c = *tokp;
if (c == '\n') {
line++;
line_start = tokp + 1;
}
else if ((c == '\\') && (tokp +1 < end)) {
tokp++;
}
else if (c == '"') {
tok = TOK_LIT_STRING;
break;
}
}
if (tok == TOK_UNKNOWN) {
error(state, 0, "unterminated string constant");
}
if (line != file->line) {
warning(state, 0, "multiline string constant");
}
file->line = line;
file->line_start = line_start;
/* Save the string value */
save_string(state, tk, token, tokp, "literal string");
}
/* character constants */
else if ((c == '\'') ||
((c == 'L') && (c1 == '\''))) {
int line;
char *line_start;
int wchar;
line = file->line;
line_start = file->line_start;
wchar = 0;
if (c == 'L') {
wchar = 1;
tokp++;
}
for(tokp += 1; tokp < end; tokp++) {
c = *tokp;
if (c == '\n') {
line++;
line_start = tokp + 1;
}
else if ((c == '\\') && (tokp +1 < end)) {
tokp++;
}
else if (c == '\'') {
tok = TOK_LIT_CHAR;
break;
}
}
if (tok == TOK_UNKNOWN) {
error(state, 0, "unterminated character constant");
}
if (line != file->line) {
warning(state, 0, "multiline character constant");
}
file->line = line;
file->line_start = line_start;
/* Save the character value */
save_string(state, tk, token, tokp, "literal character");
}
/* integer and floating constants
* Integer Constants
* {digits}
* 0[Xx]{hexdigits}
* 0{octdigit}+
*
* Floating constants
* {digits}.{digits}[Ee][+-]?{digits}
* {digits}.{digits}
* {digits}[Ee][+-]?{digits}
* .{digits}[Ee][+-]?{digits}
* .{digits}
*/
else if (digitp(c) || ((c == '.') && (digitp(c1)))) {
char *next, *new;
int is_float;
is_float = 0;
if (c != '.') {
next = after_digits(tokp, end);
}
else {
next = tokp;
}
if (next[0] == '.') {
new = after_digits(next, end);
is_float = (new != next);
next = new;
}
if ((next[0] == 'e') || (next[0] == 'E')) {
if (((next + 1) < end) &&
((next[1] == '+') || (next[1] == '-'))) {
next++;
}
new = after_digits(next, end);
is_float = (new != next);
next = new;
}
if (is_float) {
tok = TOK_LIT_FLOAT;
if ((next < end) && (
(next[0] == 'f') ||
(next[0] == 'F') ||
(next[0] == 'l') ||
(next[0] == 'L'))
) {
next++;
}
}
if (!is_float && digitp(c)) {
tok = TOK_LIT_INT;
if ((c == '0') && ((c1 == 'x') || (c1 == 'X'))) {
next = after_hexdigits(tokp + 2, end);
}
else if (c == '0') {
next = after_octdigits(tokp, end);
}
else {
next = after_digits(tokp, end);
}
/* crazy integer suffixes */
if ((next < end) &&
((next[0] == 'u') || (next[0] == 'U'))) {
next++;
if ((next < end) &&
((next[0] == 'l') || (next[0] == 'L'))) {
next++;
}
}
else if ((next < end) &&
((next[0] == 'l') || (next[0] == 'L'))) {
next++;
if ((next < end) &&
((next[0] == 'u') || (next[0] == 'U'))) {
next++;
}
}
}
tokp = next - 1;
/* Save the integer/floating point value */
save_string(state, tk, token, tokp, "literal number");
}
/* identifiers */
else if (letterp(c)) {
tok = TOK_IDENT;
for(tokp += 1; tokp < end; tokp++) {
c = *tokp;
if (!letterp(c) && !digitp(c)) {
break;
}
}
tokp -= 1;
tk->ident = lookup(state, token, tokp +1 - token);
}
/* C99 alternate macro characters */
else if ((c == '%') && (c1 == ':') && (c2 == '%') && (c3 == ':')) {
tokp += 3;
tok = TOK_CONCATENATE;
}
else if ((c == '.') && (c1 == '.') && (c2 == '.')) { tokp += 2; tok = TOK_DOTS; }
else if ((c == '<') && (c1 == '<') && (c2 == '=')) { tokp += 2; tok = TOK_SLEQ; }
else if ((c == '>') && (c1 == '>') && (c2 == '=')) { tokp += 2; tok = TOK_SREQ; }
else if ((c == '*') && (c1 == '=')) { tokp += 1; tok = TOK_TIMESEQ; }
else if ((c == '/') && (c1 == '=')) { tokp += 1; tok = TOK_DIVEQ; }
else if ((c == '%') && (c1 == '=')) { tokp += 1; tok = TOK_MODEQ; }
else if ((c == '+') && (c1 == '=')) { tokp += 1; tok = TOK_PLUSEQ; }
else if ((c == '-') && (c1 == '=')) { tokp += 1; tok = TOK_MINUSEQ; }
else if ((c == '&') && (c1 == '=')) { tokp += 1; tok = TOK_ANDEQ; }
else if ((c == '^') && (c1 == '=')) { tokp += 1; tok = TOK_XOREQ; }
else if ((c == '|') && (c1 == '=')) { tokp += 1; tok = TOK_OREQ; }
else if ((c == '=') && (c1 == '=')) { tokp += 1; tok = TOK_EQEQ; }
else if ((c == '!') && (c1 == '=')) { tokp += 1; tok = TOK_NOTEQ; }
else if ((c == '|') && (c1 == '|')) { tokp += 1; tok = TOK_LOGOR; }
else if ((c == '&') && (c1 == '&')) { tokp += 1; tok = TOK_LOGAND; }
else if ((c == '<') && (c1 == '=')) { tokp += 1; tok = TOK_LESSEQ; }
else if ((c == '>') && (c1 == '=')) { tokp += 1; tok = TOK_MOREEQ; }
else if ((c == '<') && (c1 == '<')) { tokp += 1; tok = TOK_SL; }
else if ((c == '>') && (c1 == '>')) { tokp += 1; tok = TOK_SR; }
else if ((c == '+') && (c1 == '+')) { tokp += 1; tok = TOK_PLUSPLUS; }
else if ((c == '-') && (c1 == '-')) { tokp += 1; tok = TOK_MINUSMINUS; }
else if ((c == '-') && (c1 == '>')) { tokp += 1; tok = TOK_ARROW; }
else if ((c == '<') && (c1 == ':')) { tokp += 1; tok = TOK_LBRACKET; }
else if ((c == ':') && (c1 == '>')) { tokp += 1; tok = TOK_RBRACKET; }
else if ((c == '<') && (c1 == '%')) { tokp += 1; tok = TOK_LBRACE; }
else if ((c == '%') && (c1 == '>')) { tokp += 1; tok = TOK_RBRACE; }
else if ((c == '%') && (c1 == ':')) { tokp += 1; tok = TOK_MACRO; }
else if ((c == '#') && (c1 == '#')) { tokp += 1; tok = TOK_CONCATENATE; }
else if (c == ';') { tok = TOK_SEMI; }
else if (c == '{') { tok = TOK_LBRACE; }
else if (c == '}') { tok = TOK_RBRACE; }
else if (c == ',') { tok = TOK_COMMA; }
else if (c == '=') { tok = TOK_EQ; }
else if (c == ':') { tok = TOK_COLON; }
else if (c == '[') { tok = TOK_LBRACKET; }
else if (c == ']') { tok = TOK_RBRACKET; }
else if (c == '(') { tok = TOK_LPAREN; }
else if (c == ')') { tok = TOK_RPAREN; }
else if (c == '*') { tok = TOK_STAR; }
else if (c == '>') { tok = TOK_MORE; }
else if (c == '<') { tok = TOK_LESS; }
else if (c == '?') { tok = TOK_QUEST; }
else if (c == '|') { tok = TOK_OR; }
else if (c == '&') { tok = TOK_AND; }
else if (c == '^') { tok = TOK_XOR; }
else if (c == '+') { tok = TOK_PLUS; }
else if (c == '-') { tok = TOK_MINUS; }
else if (c == '/') { tok = TOK_DIV; }
else if (c == '%') { tok = TOK_MOD; }
else if (c == '!') { tok = TOK_BANG; }
else if (c == '.') { tok = TOK_DOT; }
else if (c == '~') { tok = TOK_TILDE; }
else if (c == '#') { tok = TOK_MACRO; }
if (tok == TOK_MACRO) {
/* Only match preprocessor directives at the start of a line */
char *ptr;
for(ptr = file->line_start; spacep(*ptr); ptr++)
;
if (ptr != tokp) {
tok = TOK_UNKNOWN;
}
}
if (tok == TOK_UNKNOWN) {
error(state, 0, "unknown token");
}
file->pos = tokp + 1;
tk->tok = tok;
if (tok == TOK_IDENT) {
ident_to_keyword(state, tk);
}
/* Don't return space tokens. */
if (tok == TOK_SPACE) {
goto next_token;
}
}
static void compile_macro(struct compile_state *state, struct token *tk)
{
struct file_state *file;
struct hash_entry *ident;
ident = tk->ident;
file = xmalloc(sizeof(*file), "file_state");
file->basename = xstrdup(tk->ident->name);
file->dirname = xstrdup("");
file->size = ident->sym_define->buf_len;
file->buf = xmalloc(file->size +2, file->basename);
memcpy(file->buf, ident->sym_define->buf, file->size);
file->buf[file->size] = '\n';
file->buf[file->size + 1] = '\0';
file->pos = file->buf;
file->line_start = file->pos;
file->line = 1;
file->prev = state->file;
state->file = file;
}
static int mpeek(struct compile_state *state, int index)
{
struct token *tk;
int rescan;
tk = &state->token[index + 1];
if (tk->tok == -1) {
next_token(state, index + 1);
}
do {
rescan = 0;
if ((tk->tok == TOK_EOF) &&
(state->file != state->macro_file) &&
(state->file->prev)) {
struct file_state *file = state->file;
state->file = file->prev;
/* file->basename is used keep it */
xfree(file->dirname);
xfree(file->buf);
xfree(file);
next_token(state, index + 1);
rescan = 1;
}
else if (tk->ident && tk->ident->sym_define) {
compile_macro(state, tk);
next_token(state, index + 1);
rescan = 1;
}
} while(rescan);
/* Don't show the token on the next line */
if (state->macro_line < state->macro_file->line) {
return TOK_EOF;
}
return state->token[index +1].tok;
}
static void meat(struct compile_state *state, int index, int tok)
{
int next_tok;
int i;
next_tok = mpeek(state, index);
if (next_tok != tok) {
const char *name1, *name2;
name1 = tokens[next_tok];
name2 = "";
if (next_tok == TOK_IDENT) {
name2 = state->token[index + 1].ident->name;
}
error(state, 0, "found %s %s expected %s",
name1, name2, tokens[tok]);
}
/* Free the old token value */
if (state->token[index].str_len) {
memset((void *)(state->token[index].val.str), -1,
state->token[index].str_len);
xfree(state->token[index].val.str);
}
for(i = index; i < sizeof(state->token)/sizeof(state->token[0]) - 1; i++) {
state->token[i] = state->token[i + 1];
}
memset(&state->token[i], 0, sizeof(state->token[i]));
state->token[i].tok = -1;
}
static long_t mcexpr(struct compile_state *state, int index);
static long_t mprimary_expr(struct compile_state *state, int index)
{
long_t val;
int tok;
tok = mpeek(state, index);
while(state->token[index + 1].ident &&
state->token[index + 1].ident->sym_define) {
meat(state, index, tok);
compile_macro(state, &state->token[index]);
tok = mpeek(state, index);
}
switch(tok) {
case TOK_LPAREN:
meat(state, index, TOK_LPAREN);
val = mcexpr(state, index);
meat(state, index, TOK_RPAREN);
break;
case TOK_LIT_INT:
{
char *end;
meat(state, index, TOK_LIT_INT);
errno = 0;
val = strtol(state->token[index].val.str, &end, 0);
if (((val == LONG_MIN) || (val == LONG_MAX)) &&
(errno == ERANGE)) {
error(state, 0, "Integer constant to large");
}
break;
}
default:
meat(state, index, TOK_LIT_INT);
val = 0;
}
return val;
}
static long_t munary_expr(struct compile_state *state, int index)
{
long_t val;
switch(mpeek(state, index)) {
case TOK_PLUS:
meat(state, index, TOK_PLUS);
val = munary_expr(state, index);
val = + val;
break;
case TOK_MINUS:
meat(state, index, TOK_MINUS);
val = munary_expr(state, index);
val = - val;
break;
case TOK_TILDE:
meat(state, index, TOK_BANG);
val = munary_expr(state, index);
val = ~ val;
break;
case TOK_BANG:
meat(state, index, TOK_BANG);
val = munary_expr(state, index);
val = ! val;
break;
default:
val = mprimary_expr(state, index);
break;
}
return val;
}
static long_t mmul_expr(struct compile_state *state, int index)
{
long_t val;
int done;
val = munary_expr(state, index);
do {
long_t right;
done = 0;
switch(mpeek(state, index)) {
case TOK_STAR:
meat(state, index, TOK_STAR);
right = munary_expr(state, index);
val = val * right;
break;
case TOK_DIV:
meat(state, index, TOK_DIV);
right = munary_expr(state, index);
val = val / right;
break;
case TOK_MOD:
meat(state, index, TOK_MOD);
right = munary_expr(state, index);
val = val % right;
break;
default:
done = 1;
break;
}
} while(!done);
return val;
}
static long_t madd_expr(struct compile_state *state, int index)
{
long_t val;
int done;
val = mmul_expr(state, index);
do {
long_t right;
done = 0;
switch(mpeek(state, index)) {
case TOK_PLUS:
meat(state, index, TOK_PLUS);
right = mmul_expr(state, index);
val = val + right;
break;
case TOK_MINUS:
meat(state, index, TOK_MINUS);
right = mmul_expr(state, index);
val = val - right;
break;
default:
done = 1;
break;
}
} while(!done);
return val;
}
static long_t mshift_expr(struct compile_state *state, int index)
{
long_t val;
int done;
val = madd_expr(state, index);
do {
long_t right;
done = 0;
switch(mpeek(state, index)) {
case TOK_SL:
meat(state, index, TOK_SL);
right = madd_expr(state, index);
val = val << right;
break;
case TOK_SR:
meat(state, index, TOK_SR);
right = madd_expr(state, index);
val = val >> right;
break;
default:
done = 1;
break;
}
} while(!done);
return val;
}
static long_t mrel_expr(struct compile_state *state, int index)
{
long_t val;
int done;
val = mshift_expr(state, index);
do {
long_t right;
done = 0;
switch(mpeek(state, index)) {
case TOK_LESS:
meat(state, index, TOK_LESS);
right = mshift_expr(state, index);
val = val < right;
break;
case TOK_MORE:
meat(state, index, TOK_MORE);
right = mshift_expr(state, index);
val = val > right;
break;
case TOK_LESSEQ:
meat(state, index, TOK_LESSEQ);
right = mshift_expr(state, index);
val = val <= right;
break;
case TOK_MOREEQ:
meat(state, index, TOK_MOREEQ);
right = mshift_expr(state, index);
val = val >= right;
break;
default:
done = 1;
break;
}
} while(!done);
return val;
}
static long_t meq_expr(struct compile_state *state, int index)
{
long_t val;
int done;
val = mrel_expr(state, index);
do {
long_t right;
done = 0;
switch(mpeek(state, index)) {
case TOK_EQEQ:
meat(state, index, TOK_EQEQ);
right = mrel_expr(state, index);
val = val == right;
break;
case TOK_NOTEQ:
meat(state, index, TOK_NOTEQ);
right = mrel_expr(state, index);
val = val != right;
break;
default:
done = 1;
break;
}
} while(!done);
return val;
}
static long_t mand_expr(struct compile_state *state, int index)
{
long_t val;
val = meq_expr(state, index);
if (mpeek(state, index) == TOK_AND) {
long_t right;
meat(state, index, TOK_AND);
right = meq_expr(state, index);
val = val & right;
}
return val;
}
static long_t mxor_expr(struct compile_state *state, int index)
{
long_t val;
val = mand_expr(state, index);
if (mpeek(state, index) == TOK_XOR) {
long_t right;
meat(state, index, TOK_XOR);
right = mand_expr(state, index);
val = val ^ right;
}
return val;
}
static long_t mor_expr(struct compile_state *state, int index)
{
long_t val;
val = mxor_expr(state, index);
if (mpeek(state, index) == TOK_OR) {
long_t right;
meat(state, index, TOK_OR);
right = mxor_expr(state, index);
val = val | right;
}
return val;
}
static long_t mland_expr(struct compile_state *state, int index)
{
long_t val;
val = mor_expr(state, index);
if (mpeek(state, index) == TOK_LOGAND) {
long_t right;
meat(state, index, TOK_LOGAND);
right = mor_expr(state, index);
val = val && right;
}
return val;
}
static long_t mlor_expr(struct compile_state *state, int index)
{
long_t val;
val = mland_expr(state, index);
if (mpeek(state, index) == TOK_LOGOR) {
long_t right;
meat(state, index, TOK_LOGOR);
right = mland_expr(state, index);
val = val || right;
}
return val;
}
static long_t mcexpr(struct compile_state *state, int index)
{
return mlor_expr(state, index);
}
static void preprocess(struct compile_state *state, int index)
{
/* Doing much more with the preprocessor would require
* a parser and a major restructuring.
* Postpone that for later.
*/
struct file_state *file;
struct token *tk;
int line;
int tok;
file = state->file;
tk = &state->token[index];
state->macro_line = line = file->line;
state->macro_file = file;
next_token(state, index);
ident_to_macro(state, tk);
if (tk->tok == TOK_IDENT) {
error(state, 0, "undefined preprocessing directive `%s'",
tk->ident->name);
}
switch(tk->tok) {
case TOK_UNDEF:
case TOK_LINE:
case TOK_PRAGMA:
if (state->if_value < 0) {
break;
}
warning(state, 0, "Ignoring preprocessor directive: %s",
tk->ident->name);
break;
case TOK_ELIF:
error(state, 0, "#elif not supported");
#warning "FIXME multiple #elif and #else in an #if do not work properly"
if (state->if_depth == 0) {
error(state, 0, "#elif without #if");
}
/* If the #if was taken the #elif just disables the following code */
if (state->if_value >= 0) {
state->if_value = - state->if_value;
}
/* If the previous #if was not taken see if the #elif enables the
* trailing code.
*/
else if ((state->if_value < 0) &&
(state->if_depth == - state->if_value))
{
if (mcexpr(state, index) != 0) {
state->if_value = state->if_depth;
}
else {
state->if_value = - state->if_depth;
}
}
break;
case TOK_IF:
state->if_depth++;
if (state->if_value < 0) {
break;
}
if (mcexpr(state, index) != 0) {
state->if_value = state->if_depth;
}
else {
state->if_value = - state->if_depth;
}
break;
case TOK_IFNDEF:
state->if_depth++;
if (state->if_value < 0) {
break;
}
next_token(state, index);
if ((line != file->line) || (tk->tok != TOK_IDENT)) {
error(state, 0, "Invalid macro name");
}
if (tk->ident->sym_define == 0) {
state->if_value = state->if_depth;
}
else {
state->if_value = - state->if_depth;
}
break;
case TOK_IFDEF:
state->if_depth++;
if (state->if_value < 0) {
break;
}
next_token(state, index);
if ((line != file->line) || (tk->tok != TOK_IDENT)) {
error(state, 0, "Invalid macro name");
}
if (tk->ident->sym_define != 0) {
state->if_value = state->if_depth;
}
else {
state->if_value = - state->if_depth;
}
break;
case TOK_ELSE:
if (state->if_depth == 0) {
error(state, 0, "#else without #if");
}
if ((state->if_value >= 0) ||
((state->if_value < 0) &&
(state->if_depth == -state->if_value)))
{
state->if_value = - state->if_value;
}
break;
case TOK_ENDIF:
if (state->if_depth == 0) {
error(state, 0, "#endif without #if");
}
if ((state->if_value >= 0) ||
((state->if_value < 0) &&
(state->if_depth == -state->if_value)))
{
state->if_value = state->if_depth - 1;
}
state->if_depth--;
break;
case TOK_DEFINE:
{
struct hash_entry *ident;
struct macro *macro;
char *ptr;
if (state->if_value < 0) /* quit early when #if'd out */
break;
meat(state, index, TOK_IDENT);
ident = tk->ident;
if (*file->pos == '(') {
#warning "FIXME macros with arguments not supported"
error(state, 0, "Macros with arguments not supported");
}
/* Find the end of the line to get an estimate of
* the macro's length.
*/
for(ptr = file->pos; *ptr != '\n'; ptr++)
;
if (ident->sym_define != 0) {
error(state, 0, "macro %s already defined\n", ident->name);
}
macro = xmalloc(sizeof(*macro), "macro");
macro->ident = ident;
macro->buf_len = ptr - file->pos +1;
macro->buf = xmalloc(macro->buf_len +2, "macro buf");
memcpy(macro->buf, file->pos, macro->buf_len);
macro->buf[macro->buf_len] = '\n';
macro->buf[macro->buf_len +1] = '\0';
ident->sym_define = macro;
break;
}
case TOK_ERROR:
{
char *end;
int len;
/* Find the end of the line */
for(end = file->pos; *end != '\n'; end++)
;
len = (end - file->pos);
if (state->if_value >= 0) {
error(state, 0, "%*.*s", len, len, file->pos);
}
file->pos = end;
break;
}
case TOK_WARNING:
{
char *end;
int len;
/* Find the end of the line */
for(end = file->pos; *end != '\n'; end++)
;
len = (end - file->pos);
if (state->if_value >= 0) {
warning(state, 0, "%*.*s", len, len, file->pos);
}
file->pos = end;
break;
}
case TOK_INCLUDE:
{
char *name;
char *ptr;
int local;
local = 0;
name = 0;
next_token(state, index);
if (tk->tok == TOK_LIT_STRING) {
const char *token;
int name_len;
name = xmalloc(tk->str_len, "include");
token = tk->val.str +1;
name_len = tk->str_len -2;
if (*token == '"') {
token++;
name_len--;
}
memcpy(name, token, name_len);
name[name_len] = '\0';
local = 1;
}
else if (tk->tok == TOK_LESS) {
char *start, *end;
start = file->pos;
for(end = start; *end != '\n'; end++) {
if (*end == '>') {
break;
}
}
if (*end == '\n') {
error(state, 0, "Unterminated included directive");
}
name = xmalloc(end - start + 1, "include");
memcpy(name, start, end - start);
name[end - start] = '\0';
file->pos = end +1;
local = 0;
}
else {
error(state, 0, "Invalid include directive");
}
/* Error if there are any characters after the include */
for(ptr = file->pos; *ptr != '\n'; ptr++) {
if (!isspace(*ptr)) {
error(state, 0, "garbage after include directive");
}
}
if (state->if_value >= 0) {
compile_file(state, name, local);
}
xfree(name);
next_token(state, index);
return;
}
default:
/* Ignore # without a following ident */
if (tk->tok == TOK_IDENT) {
error(state, 0, "Invalid preprocessor directive: %s",
tk->ident->name);
}
break;
}
/* Consume the rest of the macro line */
do {
tok = mpeek(state, index);
meat(state, index, tok);
} while(tok != TOK_EOF);
return;
}
static void token(struct compile_state *state, int index)
{
struct file_state *file;
struct token *tk;
int rescan;
tk = &state->token[index];
next_token(state, index);
do {
rescan = 0;
file = state->file;
if (tk->tok == TOK_EOF && file->prev) {
state->file = file->prev;
/* file->basename is used keep it */
xfree(file->dirname);
xfree(file->buf);
xfree(file);
next_token(state, index);
rescan = 1;
}
else if (tk->tok == TOK_MACRO) {
preprocess(state, index);
rescan = 1;
}
else if (tk->ident && tk->ident->sym_define) {
compile_macro(state, tk);
next_token(state, index);
rescan = 1;
}
else if (state->if_value < 0) {
next_token(state, index);
rescan = 1;
}
} while(rescan);
}
static int peek(struct compile_state *state)
{
if (state->token[1].tok == -1) {
token(state, 1);
}
return state->token[1].tok;
}
static int peek2(struct compile_state *state)
{
if (state->token[1].tok == -1) {
token(state, 1);
}
if (state->token[2].tok == -1) {
token(state, 2);
}
return state->token[2].tok;
}
static void __eat(
const char *file, const char *func, int line,
struct compile_state *state, int tok)
{
int next_tok;
int i;
next_tok = peek(state);
if (next_tok != tok) {
const char *name1, *name2;
name1 = tokens[next_tok];
name2 = "";
if (next_tok == TOK_IDENT) {
name2 = state->token[1].ident->name;
}
internal_error(state, 0, "@ %s.%s:%d \tfound %s %s expected %s",
file, func, line,
name1, name2, tokens[tok]);
}
/* Free the old token value */
if (state->token[0].str_len) {
xfree((void *)(state->token[0].val.str));
}
for(i = 0; i < sizeof(state->token)/sizeof(state->token[0]) - 1; i++) {
state->token[i] = state->token[i + 1];
}
memset(&state->token[i], 0, sizeof(state->token[i]));
state->token[i].tok = -1;
}
#define eat(state, tok) __eat(__FILE__, __func__, __LINE__, state, tok)
#warning "FIXME do not hardcode the include paths"
static char *include_paths[] = {
"/home/eric/projects/linuxbios/checkin/solo/freebios2/src/include",
"/home/eric/projects/linuxbios/checkin/solo/freebios2/src/arch/i386/include",
"/home/eric/projects/linuxbios/checkin/solo/freebios2/src",
0
};
static void compile_file(struct compile_state *state, char *filename, int local)
{
char cwd[4096];
char *subdir, *base;
int subdir_len;
struct file_state *file;
char *basename;
file = xmalloc(sizeof(*file), "file_state");
base = strrchr(filename, '/');
subdir = filename;
if (base != 0) {
subdir_len = base - filename;
base++;
}
else {
base = filename;
subdir_len = 0;
}
basename = xmalloc(strlen(base) +1, "basename");
strcpy(basename, base);
file->basename = basename;
if (getcwd(cwd, sizeof(cwd)) == 0) {
die("cwd buffer to small");
}
if (subdir[0] == '/') {
file->dirname = xmalloc(subdir_len + 1, "dirname");
memcpy(file->dirname, subdir, subdir_len);
file->dirname[subdir_len] = '\0';
}
else {
char *dir;
int dirlen;
char **path;
/* Find the appropriate directory... */
dir = 0;
if (!state->file && exists(cwd, filename)) {
dir = cwd;
}
if (local && state->file && exists(state->file->dirname, filename)) {
dir = state->file->dirname;
}
for(path = include_paths; !dir && *path; path++) {
if (exists(*path, filename)) {
dir = *path;
}
}
if (!dir) {
error(state, 0, "Cannot find `%s'\n", filename);
}
dirlen = strlen(dir);
file->dirname = xmalloc(dirlen + 1 + subdir_len + 1, "dirname");
memcpy(file->dirname, dir, dirlen);
file->dirname[dirlen] = '/';
memcpy(file->dirname + dirlen + 1, subdir, subdir_len);
file->dirname[dirlen + 1 + subdir_len] = '\0';
}
file->buf = slurp_file(file->dirname, file->basename, &file->size);
xchdir(cwd);
file->pos = file->buf;
file->line_start = file->pos;
file->line = 1;
file->prev = state->file;
state->file = file;
process_trigraphs(state);
splice_lines(state);
}
/* visibility global/local */
/* static/auto duration */
/* typedef, register, inline */
#define STOR_SHIFT 0
#define STOR_MASK 0x000f
/* Visibility */
#define STOR_GLOBAL 0x0001
/* Duration */
#define STOR_PERM 0x0002
/* Storage specifiers */
#define STOR_AUTO 0x0000
#define STOR_STATIC 0x0002
#define STOR_EXTERN 0x0003
#define STOR_REGISTER 0x0004
#define STOR_TYPEDEF 0x0008
#define STOR_INLINE 0x000c
#define QUAL_SHIFT 4
#define QUAL_MASK 0x0070
#define QUAL_NONE 0x0000
#define QUAL_CONST 0x0010
#define QUAL_VOLATILE 0x0020
#define QUAL_RESTRICT 0x0040
#define TYPE_SHIFT 8
#define TYPE_MASK 0x1f00
#define TYPE_INTEGER(TYPE) (((TYPE) >= TYPE_CHAR) && ((TYPE) <= TYPE_ULLONG))
#define TYPE_ARITHMETIC(TYPE) (((TYPE) >= TYPE_CHAR) && ((TYPE) <= TYPE_LDOUBLE))
#define TYPE_UNSIGNED(TYPE) ((TYPE) & 0x0100)
#define TYPE_SIGNED(TYPE) (!TYPE_UNSIGNED(TYPE))
#define TYPE_MKUNSIGNED(TYPE) ((TYPE) | 0x0100)
#define TYPE_RANK(TYPE) ((TYPE) & ~0x0100)
#define TYPE_PTR(TYPE) (((TYPE) & TYPE_MASK) == TYPE_POINTER)
#define TYPE_DEFAULT 0x0000
#define TYPE_VOID 0x0100
#define TYPE_CHAR 0x0200
#define TYPE_UCHAR 0x0300
#define TYPE_SHORT 0x0400
#define TYPE_USHORT 0x0500
#define TYPE_INT 0x0600
#define TYPE_UINT 0x0700
#define TYPE_LONG 0x0800
#define TYPE_ULONG 0x0900
#define TYPE_LLONG 0x0a00 /* long long */
#define TYPE_ULLONG 0x0b00
#define TYPE_FLOAT 0x0c00
#define TYPE_DOUBLE 0x0d00
#define TYPE_LDOUBLE 0x0e00 /* long double */
#define TYPE_STRUCT 0x1000
#define TYPE_ENUM 0x1100
#define TYPE_POINTER 0x1200
/* For TYPE_POINTER:
* type->left holds the type pointed to.
*/
#define TYPE_FUNCTION 0x1300
/* For TYPE_FUNCTION:
* type->left holds the return type.
* type->right holds the...
*/
#define TYPE_PRODUCT 0x1400
/* TYPE_PRODUCT is a basic building block when defining structures
* type->left holds the type that appears first in memory.
* type->right holds the type that appears next in memory.
*/
#define TYPE_OVERLAP 0x1500
/* TYPE_OVERLAP is a basic building block when defining unions
* type->left and type->right holds to types that overlap
* each other in memory.
*/
#define TYPE_ARRAY 0x1600
/* TYPE_ARRAY is a basic building block when definitng arrays.
* type->left holds the type we are an array of.
* type-> holds the number of elements.
*/
#define ELEMENT_COUNT_UNSPECIFIED (~0UL)
struct type {
unsigned int type;
struct type *left, *right;
ulong_t elements;
struct hash_entry *ident;
};
static struct type *new_type(
unsigned int type, struct type *left, struct type *right)
{
struct type *result;
result = xmalloc(sizeof(*result), "type");
result->type = type;
result->left = left;
result->right = right;
result->ident = 0;
return result;
}
static struct type *clone_type(unsigned int specifiers, struct type *old)
{
struct type *result;
result = xmalloc(sizeof(*result), "type");
memcpy(result, old, sizeof(*result));
result->type &= TYPE_MASK;
result->type |= specifiers;
return result;
}
#define SIZEOF_SHORT 2
#define SIZEOF_INT 4
#define SIZEOF_LONG (sizeof(long_t))
#define ALIGNOF_SHORT 2
#define ALIGNOF_INT 4
#define ALIGNOF_LONG (sizeof(long_t))
#define MASK_UCHAR(X) ((X) & ((ulong_t)0xff))
#define MASK_USHORT(X) ((X) & (((ulong_t)1 << (SIZEOF_SHORT*8)) - 1))
static inline ulong_t mask_uint(ulong_t x)
{
if (SIZEOF_INT < SIZEOF_LONG) {
ulong_t mask = (((ulong_t)1) << ((ulong_t)(SIZEOF_INT*8))) -1;
x &= mask;
}
return x;
}
#define MASK_UINT(X) (mask_uint(X))
#define MASK_ULONG(X) (X)
static struct type void_type = { .type = TYPE_VOID };
static struct type char_type = { .type = TYPE_CHAR };
static struct type uchar_type = { .type = TYPE_UCHAR };
static struct type short_type = { .type = TYPE_SHORT };
static struct type ushort_type = { .type = TYPE_USHORT };
static struct type int_type = { .type = TYPE_INT };
static struct type uint_type = { .type = TYPE_UINT };
static struct type long_type = { .type = TYPE_LONG };
static struct type ulong_type = { .type = TYPE_ULONG };
static struct triple *variable(struct compile_state *state, struct type *type)
{
struct triple *result;
if ((type->type & STOR_MASK) != STOR_PERM) {
result = triple(state, OP_ADECL, type, 0, 0);
}
else {
result = triple(state, OP_SDECL, type, 0, 0);
}
return result;
}
static void stor_of(FILE *fp, struct type *type)
{
switch(type->type & STOR_MASK) {
case STOR_AUTO:
fprintf(fp, "auto ");
break;
case STOR_STATIC:
fprintf(fp, "static ");
break;
case STOR_EXTERN:
fprintf(fp, "extern ");
break;
case STOR_REGISTER:
fprintf(fp, "register ");
break;
case STOR_TYPEDEF:
fprintf(fp, "typedef ");
break;
case STOR_INLINE:
fprintf(fp, "inline ");
break;
}
}
static void qual_of(FILE *fp, struct type *type)
{
if (type->type & QUAL_CONST) {
fprintf(fp, " const");
}
if (type->type & QUAL_VOLATILE) {
fprintf(fp, " volatile");
}
if (type->type & QUAL_RESTRICT) {
fprintf(fp, " restrict");
}
}
static void name_of(FILE *fp, struct type *type)
{
stor_of(fp, type);
switch(type->type & TYPE_MASK) {
case TYPE_VOID:
fprintf(fp, "void");
qual_of(fp, type);
break;
case TYPE_CHAR:
fprintf(fp, "signed char");
qual_of(fp, type);
break;
case TYPE_UCHAR:
fprintf(fp, "unsigned char");
qual_of(fp, type);
break;
case TYPE_SHORT:
fprintf(fp, "signed short");
qual_of(fp, type);
break;
case TYPE_USHORT:
fprintf(fp, "unsigned short");
qual_of(fp, type);
break;
case TYPE_INT:
fprintf(fp, "signed int");
qual_of(fp, type);
break;
case TYPE_UINT:
fprintf(fp, "unsigned int");
qual_of(fp, type);
break;
case TYPE_LONG:
fprintf(fp, "signed long");
qual_of(fp, type);
break;
case TYPE_ULONG:
fprintf(fp, "unsigned long");
qual_of(fp, type);
break;
case TYPE_POINTER:
name_of(fp, type->left);
fprintf(fp, " * ");
qual_of(fp, type);
break;
case TYPE_PRODUCT:
case TYPE_OVERLAP:
name_of(fp, type->left);
fprintf(fp, ", ");
name_of(fp, type->right);
break;
case TYPE_ENUM:
fprintf(fp, "enum %s", type->ident->name);
qual_of(fp, type);
break;
case TYPE_STRUCT:
fprintf(fp, "struct %s", type->ident->name);
qual_of(fp, type);
break;
case TYPE_FUNCTION:
{
name_of(fp, type->left);
fprintf(fp, " (*)(");
name_of(fp, type->right);
fprintf(fp, ")");
break;
}
case TYPE_ARRAY:
name_of(fp, type->left);
fprintf(fp, " [%ld]", type->elements);
break;
default:
fprintf(fp, "????: %x", type->type & TYPE_MASK);
break;
}
}
static size_t align_of(struct compile_state *state, struct type *type)
{
size_t align;
align = 0;
switch(type->type & TYPE_MASK) {
case TYPE_VOID:
align = 1;
break;
case TYPE_CHAR:
case TYPE_UCHAR:
align = 1;
break;
case TYPE_SHORT:
case TYPE_USHORT:
align = ALIGNOF_SHORT;
break;
case TYPE_INT:
case TYPE_UINT:
case TYPE_ENUM:
align = ALIGNOF_INT;
break;
case TYPE_LONG:
case TYPE_ULONG:
case TYPE_POINTER:
align = ALIGNOF_LONG;
break;
case TYPE_PRODUCT:
case TYPE_OVERLAP:
{
size_t left_align, right_align;
left_align = align_of(state, type->left);
right_align = align_of(state, type->right);
align = (left_align >= right_align) ? left_align : right_align;
break;
}
case TYPE_ARRAY:
align = align_of(state, type->left);
break;
default:
error(state, 0, "alignof not yet defined for type\n");
break;
}
return align;
}
static size_t size_of(struct compile_state *state, struct type *type)
{
size_t size;
size = 0;
switch(type->type & TYPE_MASK) {
case TYPE_VOID:
size = 0;
break;
case TYPE_CHAR:
case TYPE_UCHAR:
size = 1;
break;
case TYPE_SHORT:
case TYPE_USHORT:
size = SIZEOF_SHORT;
break;
case TYPE_INT:
case TYPE_UINT:
case TYPE_ENUM:
size = SIZEOF_INT;
break;
case TYPE_LONG:
case TYPE_ULONG:
case TYPE_POINTER:
size = SIZEOF_LONG;
break;
case TYPE_PRODUCT:
{
size_t align, pad;
size = size_of(state, type->left);
while((type->right->type & TYPE_MASK) == TYPE_PRODUCT) {
type = type->right;
align = align_of(state, type->left);
pad = align - (size % align);
size = size + pad + size_of(state, type->left);
}
align = align_of(state, type->right);
pad = align - (size % align);
size = size + pad + sizeof(type->right);
break;
}
case TYPE_OVERLAP:
{
size_t size_left, size_right;
size_left = size_of(state, type->left);
size_right = size_of(state, type->right);
size = (size_left >= size_right)? size_left : size_right;
break;
}
case TYPE_ARRAY:
if (type->elements == ELEMENT_COUNT_UNSPECIFIED) {
internal_error(state, 0, "Invalid array type");
} else {
size = size_of(state, type->left) * type->elements;
}
break;
default:
error(state, 0, "sizeof not yet defined for type\n");
break;
}
return size;
}
static void arrays_complete(struct compile_state *state, struct type *type)
{
if ((type->type & TYPE_MASK) == TYPE_ARRAY) {
if (type->elements == ELEMENT_COUNT_UNSPECIFIED) {
error(state, 0, "array size not specified");
}
arrays_complete(state, type->left);
}
}
static unsigned int do_integral_promotion(unsigned int type)
{
type &= TYPE_MASK;
if (TYPE_INTEGER(type) &&
TYPE_RANK(type) < TYPE_RANK(TYPE_INT)) {
type = TYPE_INT;
}
return type;
}
static unsigned int do_arithmetic_conversion(
unsigned int left, unsigned int right)
{
left &= TYPE_MASK;
right &= TYPE_MASK;
if ((left == TYPE_LDOUBLE) || (right == TYPE_LDOUBLE)) {
return TYPE_LDOUBLE;
}
else if ((left == TYPE_DOUBLE) || (right == TYPE_DOUBLE)) {
return TYPE_DOUBLE;
}
else if ((left == TYPE_FLOAT) || (right == TYPE_FLOAT)) {
return TYPE_FLOAT;
}
left = do_integral_promotion(left);
right = do_integral_promotion(right);
/* If both operands have the same size done */
if (left == right) {
return left;
}
/* If both operands have the same signedness pick the larger */
else if (!!TYPE_UNSIGNED(left) == !!TYPE_UNSIGNED(right)) {
return (TYPE_RANK(left) >= TYPE_RANK(right)) ? left : right;
}
/* If the signed type can hold everything use it */
else if (TYPE_SIGNED(left) && (TYPE_RANK(left) > TYPE_RANK(right))) {
return left;
}
else if (TYPE_SIGNED(right) && (TYPE_RANK(right) > TYPE_RANK(left))) {
return right;
}
/* Convert to the unsigned type with the same rank as the signed type */
else if (TYPE_SIGNED(left)) {
return TYPE_MKUNSIGNED(left);
}
else {
return TYPE_MKUNSIGNED(right);
}
}
/* see if two types are the same except for qualifiers */
static int equiv_types(struct type *left, struct type *right)
{
unsigned int type;
/* Error if the basic types do not match */
if ((left->type & TYPE_MASK) != (right->type & TYPE_MASK)) {
return 0;
}
type = left->type & TYPE_MASK;
/* if the basic types match and it is an arithmetic type we are done */
if (TYPE_ARITHMETIC(type)) {
return 1;
}
/* If it is a pointer type recurse and keep testing */
if (type == TYPE_POINTER) {
return equiv_types(left->left, right->left);
}
else if (type == TYPE_ARRAY) {
return (left->elements == right->elements) &&
equiv_types(left->left, right->left);
}
/* test for struct/union equality */
else if (type == TYPE_STRUCT) {
return left->ident == right->ident;
}
/* Test for equivalent functions */
else if (type == TYPE_FUNCTION) {
return equiv_types(left->left, right->left) &&
equiv_types(left->right, right->right);
}
/* We only see TYPE_PRODUCT as part of function equivalence matching */
else if (type == TYPE_PRODUCT) {
return equiv_types(left->left, right->left) &&
equiv_types(left->right, right->right);
}
/* We should see TYPE_OVERLAP */
else {
return 0;
}
}
static int equiv_ptrs(struct type *left, struct type *right)
{
if (((left->type & TYPE_MASK) != TYPE_POINTER) ||
((right->type & TYPE_MASK) != TYPE_POINTER)) {
return 0;
}
return equiv_types(left->left, right->left);
}
static struct type *compatible_types(struct type *left, struct type *right)
{
struct type *result;
unsigned int type, qual_type;
/* Error if the basic types do not match */
if ((left->type & TYPE_MASK) != (right->type & TYPE_MASK)) {
return 0;
}
type = left->type & TYPE_MASK;
qual_type = (left->type & ~STOR_MASK) | (right->type & ~STOR_MASK);
result = 0;
/* if the basic types match and it is an arithmetic type we are done */
if (TYPE_ARITHMETIC(type)) {
result = new_type(qual_type, 0, 0);
}
/* If it is a pointer type recurse and keep testing */
else if (type == TYPE_POINTER) {
result = compatible_types(left->left, right->left);
if (result) {
result = new_type(qual_type, result, 0);
}
}
/* test for struct/union equality */
else if (type == TYPE_STRUCT) {
if (left->ident == right->ident) {
result = left;
}
}
/* Test for equivalent functions */
else if (type == TYPE_FUNCTION) {
struct type *lf, *rf;
lf = compatible_types(left->left, right->left);
rf = compatible_types(left->right, right->right);
if (lf && rf) {
result = new_type(qual_type, lf, rf);
}
}
/* We only see TYPE_PRODUCT as part of function equivalence matching */
else if (type == TYPE_PRODUCT) {
struct type *lf, *rf;
lf = compatible_types(left->left, right->left);
rf = compatible_types(left->right, right->right);
if (lf && rf) {
result = new_type(qual_type, lf, rf);
}
}
else {
/* Nothing else is compatible */
}
return result;
}
static struct type *compatible_ptrs(struct type *left, struct type *right)
{
struct type *result;
if (((left->type & TYPE_MASK) != TYPE_POINTER) ||
((right->type & TYPE_MASK) != TYPE_POINTER)) {
return 0;
}
result = compatible_types(left->left, right->left);
if (result) {
unsigned int qual_type;
qual_type = (left->type & ~STOR_MASK) | (right->type & ~STOR_MASK);
result = new_type(qual_type, result, 0);
}
return result;
}
static struct triple *integral_promotion(
struct compile_state *state, struct triple *def)
{
struct type *type;
type = def->type;
/* As all operations are carried out in registers
* the values are converted on load I just convert
* logical type of the operand.
*/
if (TYPE_INTEGER(type->type)) {
unsigned int int_type;
int_type = type->type & ~TYPE_MASK;
int_type |= do_integral_promotion(type->type);
if (int_type != type->type) {
def->type = new_type(int_type, 0, 0);
}
}
return def;
}
static void arithmetic(struct compile_state *state, struct triple *def)
{
if (!TYPE_ARITHMETIC(def->type->type)) {
error(state, def, "arithmetic type expexted");
}
}
static void ptr_arithmetic(struct compile_state *state, struct triple *def)
{
if (!TYPE_PTR(def->type->type) && !TYPE_ARITHMETIC(def->type->type)) {
error(state, def, "pointer or arithmetic type expected");
}
}
static int is_integral(struct triple *ins)
{
return TYPE_INTEGER(ins->type->type);
}
static void integral(struct compile_state *state, struct triple *def)
{
if (!is_integral(def)) {
error(state, 0, "integral type expected");
}
}
static void bool(struct compile_state *state, struct triple *def)
{
if (!TYPE_ARITHMETIC(def->type->type) &&
((def->type->type & TYPE_MASK) != TYPE_POINTER)) {
error(state, 0, "arithmetic or pointer type expected");
}
}
static int is_signed(struct type *type)
{
return !!TYPE_SIGNED(type->type);
}
/* Is this a stable variable location otherwise it must be a temporary */
static int is_stable(struct triple *def)
{
int ret;
ret = 0;
if (!def) {
return 0;
}
if ((def->op == OP_ADECL) ||
(def->op == OP_SDECL) ||
(def->op == OP_DEREF) ||
(def->op == OP_BLOBCONST)) {
ret = 1;
}
else if (def->op == OP_DOT) {
ret = is_stable(def->left);
}
return ret;
}
static int is_lvalue(struct triple *def)
{
int ret;
ret = 1;
if (!def) {
return 0;
}
if (!is_stable(def)) {
return 0;
}
if (def->type->type & QUAL_CONST) {
ret = 0;
}
else if (def->op == OP_DOT) {
ret = is_lvalue(def->left);
}
return ret;
}
static void lvalue(struct compile_state *state, struct triple *def)
{
if (!def) {
internal_error(state, def, "nothing where lvalue expected?");
}
if (!is_lvalue(def)) {
error(state, def, "lvalue expected");
}
}
static int is_pointer(struct triple *def)
{
return (def->type->type & TYPE_MASK) == TYPE_POINTER;
}
static void pointer(struct compile_state *state, struct triple *def)
{
if (!is_pointer(def)) {
error(state, def, "pointer expected");
}
}
static struct triple *int_const(
struct compile_state *state, struct type *type, ulong_t value)
{
struct triple *result;
switch(type->type & TYPE_MASK) {
case TYPE_CHAR:
case TYPE_INT: case TYPE_UINT:
case TYPE_LONG: case TYPE_ULONG:
break;
default:
internal_error(state, 0, "constant for unkown type");
}
result = triple(state, OP_INTCONST, type, 0, 0);
result->u.cval = value;
return result;
}
static struct triple *mk_addr_expr(
struct compile_state *state, struct triple *expr, ulong_t offset)
{
struct triple *result;
struct type *type;
lvalue(state, expr);
type = new_type(
TYPE_POINTER | (expr->type->type & QUAL_MASK),
expr->type, 0);
result = 0;
if (expr->op == OP_ADECL) {
error(state, expr, "address of auto variables not supported");
}
else if (expr->op == OP_SDECL) {
result = triple(state, OP_ADDRCONST, type, expr, 0);
result->u.cval = offset;
}
else if (expr->op == OP_DEREF) {
result = triple(state, OP_ADD, type,
expr->left,
int_const(state, &ulong_type, offset));
}
return result;
}
static struct triple *mk_deref_expr(
struct compile_state *state, struct triple *expr)
{
struct type *base_type;
pointer(state, expr);
base_type = expr->type->left;
if (!TYPE_PTR(base_type->type) && !TYPE_ARITHMETIC(base_type->type)) {
error(state, 0,
"Only pointer and arithmetic values can be dereferenced");
}
return triple(state, OP_DEREF, base_type, expr, 0);
}
static struct triple *read_expr(struct compile_state *state, struct triple *def)
{
int op;
if (!def) {
return 0;
}
if (!is_stable(def)) {
return def;
}
/* Tranform an array to a pointer to the first element */
#warning "CHECK_ME is this the right place to transform arrays to pointers?"
if ((def->type->type & TYPE_MASK) == TYPE_ARRAY) {
struct type *type;
type = new_type(
TYPE_POINTER | (def->type->type & QUAL_MASK),
def->type->left, 0);
return triple(state, OP_ADDRCONST, type, def, 0);
}
/* Only values in variables need to be read */
if (def->op == OP_ADECL) {
op = OP_READ;
}
else if ((def->op == OP_SDECL) || (def->op == OP_DEREF)) {
op = OP_LOAD;
}
else {
internal_error(state, 0, "unhandled read expr type");
op = -1;
}
return triple(state, op, def->type, def, 0);
}
static void write_compatible(struct compile_state *state,
struct type *dest, struct type *rval)
{
int compatible = 0;
/* Both operands have arithmetic type */
if (TYPE_ARITHMETIC(dest->type) && TYPE_ARITHMETIC(rval->type)) {
compatible = 1;
}
/* One operand is a pointer and the other is a pointer to void */
else if (((dest->type & TYPE_MASK) == TYPE_POINTER) &&
((rval->type & TYPE_MASK) == TYPE_POINTER) &&
(((dest->left->type & TYPE_MASK) == TYPE_VOID) ||
((rval->left->type & TYPE_MASK) == TYPE_VOID))) {
compatible = 1;
}
/* If both types are the same without qualifiers we are good */
else if (equiv_ptrs(dest, rval)) {
compatible = 1;
}
if (!compatible) {
error(state, 0, "Incompatible types in assignment");
}
}
static struct triple *write_expr(
struct compile_state *state, struct triple *dest, struct triple *rval)
{
struct triple *def;
int op;
def = 0;
if (!rval) {
internal_error(state, 0, "missing rval");
}
if (rval->op == OP_LIST) {
internal_error(state, 0, "expression of type OP_LIST?");
}
if (!is_lvalue(dest)) {
internal_error(state, 0, "writing to a non lvalue?");
}
write_compatible(state, dest->type, rval->type);
/* Now figure out which assignment operator to use */
op = -1;
if (dest->op == OP_ADECL) {
op = OP_WRITE;
}
else if ((dest->op == OP_SDECL) || (dest->op == OP_DEREF)) {
op = OP_STORE;
}
else {
internal_error(state, 0, "unimplemented lvalue type");
}
#warning "FIXME walk through a list of OP_DOT entries and generate a pointer addition"
def = triple(state, op, dest->type, dest, rval);
return def;
}
static struct triple *init_expr(
struct compile_state *state, struct triple *dest, struct triple *rval)
{
struct triple *def;
def = 0;
if (!rval) {
internal_error(state, 0, "missing rval");
}
if ((dest->type->type & STOR_MASK) != STOR_PERM) {
rval = read_expr(state, rval);
def = write_expr(state, dest, rval);
}
else {
/* Fill in the array size if necessary */
if (((dest->type->type & TYPE_MASK) == TYPE_ARRAY) &&
((rval->type->type & TYPE_MASK) == TYPE_ARRAY)) {
if (dest->type->elements == ELEMENT_COUNT_UNSPECIFIED) {
dest->type->elements = rval->type->elements;
}
}
if (!equiv_types(dest->type, rval->type)) {
error(state, 0, "Incompatible types in inializer");
}
dest->left = rval;
}
return def;
}
struct type *arithmetic_result(
struct compile_state *state, struct triple *left, struct triple *right)
{
struct type *type;
/* Sanity checks to ensure I am working with arithmetic types */
arithmetic(state, left);
arithmetic(state, right);
type = new_type(
do_arithmetic_conversion(
left->type->type,
right->type->type), 0, 0);
return type;
}
struct type *ptr_arithmetic_result(
struct compile_state *state, struct triple *left, struct triple *right)
{
struct type *type;
/* Sanity checks to ensure I am working with the proper types */
ptr_arithmetic(state, left);
arithmetic(state, right);
if (TYPE_ARITHMETIC(left->type->type) &&
TYPE_ARITHMETIC(right->type->type)) {
type = arithmetic_result(state, left, right);
}
else if (TYPE_PTR(left->type->type)) {
type = left->type;
}
else {
internal_error(state, 0, "huh?");
type = 0;
}
return type;
}
/* boolean helper function */
static struct triple *ltrue_expr(struct compile_state *state,
struct triple *expr)
{
switch(expr->op) {
case OP_LTRUE: case OP_LFALSE: case OP_EQ: case OP_NOTEQ:
case OP_SLESS: case OP_ULESS: case OP_SMORE: case OP_UMORE:
case OP_SLESSEQ: case OP_ULESSEQ: case OP_SMOREEQ: case OP_UMOREEQ:
/* If the expression is already boolean do nothing */
break;
default:
expr = triple(state, OP_LTRUE, &int_type, expr, 0);
break;
}
return expr;
}
static struct triple *lfalse_expr(struct compile_state *state,
struct triple *expr)
{
return triple(state, OP_LFALSE, &int_type, expr, 0);
}
static struct triple *cond_expr(
struct compile_state *state,
struct triple *test, struct triple *left, struct triple *right)
{
struct triple *def;
struct type *result_type;
unsigned int left_type, right_type;
bool(state, test);
left_type = left->type->type;
right_type = right->type->type;
result_type = 0;
/* Both operands have arithmetic type */
if (TYPE_ARITHMETIC(left_type) && TYPE_ARITHMETIC(right_type)) {
result_type = arithmetic_result(state, left, right);
}
/* Both operands have void type */
else if (((left_type & TYPE_MASK) == TYPE_VOID) &&
((right_type & TYPE_MASK) == TYPE_VOID)) {
result_type = &void_type;
}
/* pointers to the same type... */
else if ((result_type = compatible_ptrs(left->type, right->type))) {
;
}
/* Both operands are pointers and left is a pointer to void */
else if (((left_type & TYPE_MASK) == TYPE_POINTER) &&
((right_type & TYPE_MASK) == TYPE_POINTER) &&
((left->type->left->type & TYPE_MASK) == TYPE_VOID)) {
result_type = right->type;
}
/* Both operands are pointers and right is a pointer to void */
else if (((left_type & TYPE_MASK) == TYPE_POINTER) &&
((right_type & TYPE_MASK) == TYPE_POINTER) &&
((right->type->left->type & TYPE_MASK) == TYPE_VOID)) {
result_type = left->type;
}
if (!result_type) {
error(state, 0, "Incompatible types in conditional expression");
}
def = triple(state, OP_COND, result_type, test,
triple(state, OP_PRODUCT, &void_type, left, right));
return def;
}
static int expr_depth(struct compile_state *state, struct triple *triple)
{
int count;
count = 0;
if (!triple) {
return 0;
}
/* All of the internal helper ops that are not removed by
* flatten must be present here.
*/
if (triple->op == OP_READ) {
;
}
else if (triple->op == OP_DEREF) {
count = expr_depth(state, triple->left) - 1;
}
else if (triple->op == OP_VAL) {
count = expr_depth(state, triple->left) - 1;
}
else if (triple->op == OP_COMMA) {
int left, right;
left = expr_depth(state, triple->left);
right = expr_depth(state, triple->right);
count = (left >= right)? left : right;
}
else if (triple->op == OP_CALL) {
/* Don't figure the depth of a call just guess it is huge */
count = 1000;
}
else {
struct triple **expr;
expr = triple_rhs(state, triple, 0);
for(;expr; expr = triple_rhs(state, triple, expr)) {
int depth;
depth = expr_depth(state, *expr);
if (depth > count) {
count = depth;
}
}
}
return count + 1;
}
static struct triple *flatten(
struct compile_state *state, struct triple *first, struct triple *ptr);
static struct triple *flatten_rhs(
struct compile_state *state, struct triple *first, struct triple *ptr)
{
struct triple **left, **right, **last;
/* Only operations with a rhs should come here */
last = triple_lhs(state, ptr, 0);
if (last) {
internal_error(state, ptr, "unexpected rhs for: %d %s",
ptr->op, tops(ptr->op));
}
/* Collect up the rhs */
left = triple_rhs(state, ptr, 0);
right = last = 0;
if (left) {
right = triple_rhs(state, ptr, left);
}
if (right) {
last = triple_rhs(state, ptr, right);
}
if (last) {
internal_error(state, ptr, "too many rhs arguments for: %d %s",
ptr->op, tops(ptr->op));
}
if (left && right) {
if (expr_depth(state, *left) >= expr_depth(state, *right)) {
*left = flatten(state, first, *left);
*right = flatten(state, first, *right);
}
else {
*right = flatten(state, first, *right);
*left = flatten(state, first, *left);
}
use_triple(*left, ptr);
use_triple(*right, ptr);
}
else if (left) {
*left = flatten(state, first, *left);
use_triple(*left, ptr);
}
return ptr;
}
static struct triple *flatten_land(
struct compile_state *state, struct triple *first, struct triple *ptr)
{
struct triple *left, *right;
struct triple *val, *test, *jmp, *label1, *end;
/* Find the triples */
left = ptr->left;
right = ptr->right;
/* Generate the needed triples */
end = label(state);
/* Thread the triples together */
val = flatten(state, first, variable(state, ptr->type));
left = flatten(state, first, write_expr(state, val, left));
test = flatten(state, first,
lfalse_expr(state, read_expr(state, val)));
jmp = flatten(state, first,
triple(state, OP_BRANCH, &void_type, end, test));
label1 = flatten(state, first, label(state));
right = flatten(state, first, write_expr(state, val, right));
jmp->left = flatten(state, first, end);
/* Now give the caller something to chew on */
return read_expr(state, val);
}
static struct triple *flatten_lor(
struct compile_state *state, struct triple *first, struct triple *ptr)
{
struct triple *left, *right;
struct triple *val, *jmp, *label1, *end;
/* Find the triples */
left = ptr->left;
right = ptr->right;
/* Generate the needed triples */
end = label(state);
/* Thread the triples together */
val = flatten(state, first, variable(state, ptr->type));
left = flatten(state, first, write_expr(state, val, left));
jmp = flatten(state, first,
triple(state, OP_BRANCH, &void_type, end, left));
label1 = flatten(state, first, label(state));
right = flatten(state, first, write_expr(state, val, right));
jmp->left = flatten(state, first, end);
/* Now give the caller something to chew on */
return read_expr(state, val);
}
static struct triple *flatten_cond(
struct compile_state *state, struct triple *first, struct triple *ptr)
{
struct triple *test, *left, *right;
struct triple *val, *mv1, *jmp1, *label1, *mv2, *middle, *jmp2, *end;
if (ptr->right->op != OP_PRODUCT) {
internal_error(state, 0, "Improper conditional expression");
}
/* Find the triples */
test = ptr->left;
left = ptr->right->left;
right = ptr->right->right;
/* Generate the needed triples */
end = label(state);
middle = label(state);
/* Thread the triples together */
val = flatten(state, first, variable(state, ptr->type));
test = flatten(state, first, test);
jmp1 = flatten(state, first,
triple(state, OP_BRANCH, &void_type, middle, test));
label1 = flatten(state, first, label(state));
left = flatten(state, first, left);
mv1 = flatten(state, first, write_expr(state, val, left));
jmp2 = flatten(state, first,
triple(state, OP_BRANCH, &void_type, end, 0));
jmp1->left = flatten(state, first, middle);
right = flatten(state, first, right);
mv2 = flatten(state, first, write_expr(state, val, right));
jmp2->left = flatten(state, first, end);
/* Now give the caller something to chew on */
return read_expr(state, val);
}
struct triple *copy_func(struct compile_state *state, struct triple *ofunc)
{
struct triple *nfunc;
struct triple *nfirst, *ofirst;
struct triple *new, *old;
#if 0
fprintf(stdout, "\n");
loc(stdout, state, 0);
fprintf(stdout, "\n__________ copy_func _________\n");
print_triple(state, ofunc);
fprintf(stdout, "__________ copy_func _________ done\n\n");
#endif
/* Make a new copy of the old function */
nfunc = triple(state, OP_LIST, ofunc->type, 0, 0);
nfirst = 0;
ofirst = old = ofunc->left;
do {
struct triple *new;
new = build_triple(state, old->op, old->type, 0, 0,
old->filename, old->line, old->col);
if (IS_CONST_OP(new->op)) {
memcpy(&new->u, &old->u, sizeof(new->u));
}
#warning "WISHLIST find a way to handle SDECL without a special case..."
else if (new->op == OP_SDECL) {
new->left = old->left;
}
if (!nfirst) {
nfunc->left = nfirst = new;
}
else {
insert_triple(state, nfirst, new);
}
/* During the copy remember new as user of old */
use_triple(old, new);
/* Populate the return type if present */
if (old == ofunc->right) {
nfunc->right = new;
}
old = old->next;
} while(old != ofirst);
/* Make a second pass to fix up any unresolved references */
old = ofirst;
new = nfirst;
do {
/* Lookup where the copy is, to join pointers */
if (!new->left && old->left && old->left->use) {
new->left = old->left->use->member;
if (new->left == old) {
internal_error(state, 0, "new == old?");
}
}
if (!new->right && old->right && old->right->use) {
new->right = old->right->use->member;
if (new->right == old) {
internal_error(state, 0, "new == old?");
}
}
if (!new->left && old->left) {
internal_error(state, 0, "Could not copy left");
}
if (!new->right && old->right) {
internal_error(state, 0, "Could not copy right");
}
if (new->op != old->op) {
internal_error(state, 0, "Could not copy op?");
}
if (!new->next && old->next) {
internal_error(state, 0, "Could not copy next");
}
use_triple(new->left, new);
use_triple(new->right, new);
if (new->op == OP_BRANCH) {
if (new->right) {
use_triple(new->next, new);
}
}
old = old->next;
new = new->next;
} while((old != ofirst) && (new != nfirst));
/* Make a third pass to cleanup the extra useses */
old = ofirst;
new = nfirst;
do {
unuse_triple(old, new);
old = old->next;
new = new->next;
} while ((old != ofirst) && (new != nfirst));
return nfunc;
}
static struct triple *flatten_call(
struct compile_state *state, struct triple *first, struct triple *ptr)
{
/* Inline the function call */
struct triple *ofunc, *nfunc, *nfirst, *args, *param, *result;
struct triple *end, *nend;
int done;
/* Find the triples */
ofunc = ptr->left;
args = ptr->right;
if (ofunc->op != OP_LIST) {
internal_error(state, 0, "improper function");
}
nfunc = copy_func(state, ofunc);
nfirst = nfunc->left->next;
param = nfunc->left->next;
/* Prepend the parameter reading into the new function list */
while(args) {
struct triple *arg;
arg = args;
done = 1;
if (args->op == OP_PRODUCT) {
arg = args->left;
}
flatten(state, nfirst,
write_expr(state, param, arg));
param = param->next;
args = (args->op == OP_PRODUCT)? args->right : 0;
}
result = 0;
if ((nfunc->type->left->type & TYPE_MASK) != TYPE_VOID) {
result = read_expr(state, nfunc->right);
}
#if 0
fprintf(stdout, "\n");
loc(stdout, state, 0);
fprintf(stdout, "\n__________ flatten_call _________\n");
print_triple(state, nfunc);
fprintf(stdout, "__________ flatten_call _________ done\n\n");
#endif
/* Get rid of the extra triples */
nfirst = nfunc->left->next;
free_triple(state, nfunc->left);
nfunc->left = 0;
free_triple(state, nfunc);
/* Append the new function list onto the return list */
end = first->prev;
nend = nfirst->prev;
end->next = nfirst;
nfirst->prev = end;
nend->next = first;
first->prev = nend;
return result;
}
static struct triple *flatten(
struct compile_state *state, struct triple *first, struct triple *ptr)
{
struct triple *orig_ptr;
if (!ptr)
return 0;
do {
orig_ptr = ptr;
switch(ptr->op) {
case OP_WRITE:
case OP_STORE:
ptr->right = flatten(state, first, ptr->right);
ptr->left = flatten(state, first, ptr->left);
use_triple(ptr->left, ptr);
use_triple(ptr->right, ptr);
break;
case OP_COMMA:
ptr->left = flatten(state, first, ptr->left);
ptr = ptr->right;
break;
case OP_VAL:
ptr->left = flatten(state, first, ptr->left);
return ptr->right;
break;
case OP_LAND:
ptr = flatten_land(state, first, ptr);
break;
case OP_LOR:
ptr = flatten_lor(state, first, ptr);
break;
case OP_COND:
ptr = flatten_cond(state, first, ptr);
break;
case OP_CALL:
ptr = flatten_call(state, first, ptr);
break;
case OP_READ:
case OP_LOAD:
ptr->left = flatten(state, first, ptr->left);
use_triple(ptr->left, ptr);
break;
case OP_BRANCH:
use_triple(ptr->left, ptr);
use_triple(ptr->right, ptr);
if (ptr->next != ptr) {
use_triple(ptr->next, ptr);
}
break;
case OP_ADDRCONST:
ptr->left = flatten(state, first, ptr->left);
use_triple(ptr->left, ptr);
break;
case OP_BLOBCONST:
ptr = triple(state, OP_SDECL, ptr->type, ptr, 0);
use_triple(ptr->left, ptr);
break;
case OP_DEREF:
/* Since OP_DEREF is just a marker delete it when I flatten it */
ptr = ptr->left;
orig_ptr->left = 0;
free_triple(state, orig_ptr);
break;
case OP_PRODUCT:
case OP_DOT:
internal_error(state, 0, "unknown expression type: %d %s",
ptr->op, tops(ptr->op));
break;
case OP_SDECL:
case OP_ADECL:
/* Don't flatten already flattened decls */
if ((ptr->next != ptr) || (ptr->prev != ptr)) {
return ptr;
}
break;
default:
/* Flatten the easy cases we don't override */
ptr = flatten_rhs(state, first, ptr);
break;
}
} while(ptr && (ptr != orig_ptr));
insert_triple(state, first, ptr);
return ptr;
}
static void release_expr(struct compile_state *state, struct triple *expr)
{
struct triple *head;
head = label(state);
flatten(state, head, expr);
while(head->next != head) {
release_triple(state, head->next);
}
free_triple(state, head);
}
static int replace_rhs_use(struct compile_state *state,
struct triple *orig, struct triple *new, struct triple *use)
{
struct triple **expr;
int found;
found = 0;
expr = triple_rhs(state, use, 0);
for(;expr; expr = triple_rhs(state, use, expr)) {
if (*expr == orig) {
*expr = new;
found = 1;
}
}
if (found) {
unuse_triple(orig, use);
use_triple(new, use);
}
return found;
}
static int replace_lhs_use(struct compile_state *state,
struct triple *orig, struct triple *new, struct triple *use)
{
struct triple **expr;
int found;
found = 0;
expr = triple_lhs(state, use, 0);
for(;expr; expr = triple_lhs(state, use, expr)) {
if (*expr == orig) {
*expr = new;
found = 1;
}
}
if (found) {
unuse_triple(orig, use);
use_triple(new, use);
}
return found;
}
static void propogate_use(struct compile_state *state,
struct triple *orig, struct triple *new)
{
struct triple_set *user, *next;
for(user = orig->use; user; user = next) {
struct triple *use;
int found;
next = user->next;
use = user->member;
found = 0;
found |= replace_rhs_use(state, orig, new, use);
found |= replace_lhs_use(state, orig, new, use);
if (!found) {
internal_error(state, use, "use without use");
}
}
if (orig->use) {
internal_error(state, orig, "used after propogate_use");
}
}
/*
* Code generators
* ===========================
*/
static struct triple *mk_add_expr(
struct compile_state *state, struct triple *left, struct triple *right)
{
struct type *result_type;
/* Put pointer operands on the left */
if (is_pointer(right)) {
struct triple *tmp;
tmp = left;
left = right;
right = tmp;
}
result_type = ptr_arithmetic_result(state, left, right);
left = read_expr(state, left);
right = read_expr(state, right);
if (is_pointer(left)) {
right = triple(state,
is_signed(right->type)? OP_SMUL : OP_UMUL,
&ulong_type,
right,
int_const(state, &ulong_type,
size_of(state, left->type->left)));
}
return triple(state, OP_ADD, result_type, left, right);
}
static struct triple *mk_sub_expr(
struct compile_state *state, struct triple *left, struct triple *right)
{
struct type *result_type;
result_type = ptr_arithmetic_result(state, left, right);
left = read_expr(state, left);
right = read_expr(state, right);
if (is_pointer(left)) {
right = triple(state,
is_signed(right->type)? OP_SMUL : OP_UMUL,
&ulong_type,
right,
int_const(state, &ulong_type,
size_of(state, left->type->left)));
}
return triple(state, OP_SUB, result_type, left, right);
}
static struct triple *mk_pre_inc_expr(
struct compile_state *state, struct triple *def)
{
struct triple *val;
lvalue(state, def);
val = mk_add_expr(state, def, int_const(state, &int_type, 1));
return triple(state, OP_VAL, def->type,
write_expr(state, def, val),
val);
}
static struct triple *mk_pre_dec_expr(
struct compile_state *state, struct triple *def)
{
struct triple *val;
lvalue(state, def);
val = mk_sub_expr(state, def, int_const(state, &int_type, 1));
return triple(state, OP_VAL, def->type,
write_expr(state, def, val),
val);
}
static struct triple *mk_post_inc_expr(
struct compile_state *state, struct triple *def)
{
struct triple *val;
lvalue(state, def);
val = read_expr(state, def);
return triple(state, OP_VAL, def->type,
write_expr(state, def,
mk_add_expr(state, val, int_const(state, &int_type, 1)))
, val);
}
static struct triple *mk_post_dec_expr(
struct compile_state *state, struct triple *def)
{
struct triple *val;
lvalue(state, def);
val = read_expr(state, def);
return triple(state, OP_VAL, def->type,
write_expr(state, def,
mk_sub_expr(state, val, int_const(state, &int_type, 1)))
, val);
}
static struct triple *mk_subscript_expr(
struct compile_state *state, struct triple *left, struct triple *right)
{
left = read_expr(state, left);
right = read_expr(state, right);
if (!is_pointer(left) && !is_pointer(right)) {
error(state, left, "subscripted value is not a pointer");
}
return mk_deref_expr(state, mk_add_expr(state, left, right));
}
/*
* Compile time evaluation
* ===========================
*/
static int is_const(struct triple *ins)
{
return IS_CONST_OP(ins->op);
}
static int constants_equal(struct compile_state *state,
struct triple *left, struct triple *right)
{
int equal;
if (!is_const(left) || !is_const(right)) {
equal = 0;
}
else if (left->op != right->op) {
equal = 0;
}
else if (!equiv_types(left->type, right->type)) {
equal = 0;
}
else {
equal = 0;
switch(left->op) {
case OP_INTCONST:
if (left->u.cval == right->u.cval) {
equal = 1;
}
break;
case OP_BLOBCONST:
{
size_t lsize, rsize;
lsize = size_of(state, left->type);
rsize = size_of(state, right->type);
if (lsize != rsize) {
break;
}
if (memcmp(left->u.blob, right->u.blob, lsize) == 0) {
equal = 1;
}
break;
}
case OP_ADDRCONST:
if ((left->left == right->left) &&
(left->u.cval == right->u.cval)) {
equal = 1;
}
break;
default:
internal_error(state, left, "uknown constant type");
break;
}
}
return equal;
}
static int is_zero(struct triple *ins)
{
return is_const(ins) && (ins->u.cval == 0);
}
static int is_one(struct triple *ins)
{
return is_const(ins) && (ins->u.cval == 1);
}
static long_t bsr(ulong_t value)
{
int i;
for(i = (sizeof(ulong_t)*8) -1; i >= 0; i--) {
ulong_t mask;
mask = 1;
mask <<= i;
if (value & mask) {
return i;
}
}
return -1;
}
static long_t bsf(ulong_t value)
{
int i;
for(i = 0; i < (sizeof(ulong_t)*8); i++) {
ulong_t mask;
mask = 1;
mask <<= 1;
if (value & mask) {
return i;
}
}
return -1;
}
static long_t log2(ulong_t value)
{
return bsr(value);
}
static long_t tlog2(struct triple *ins)
{
return log2(ins->u.cval);
}
static int is_pow2(struct triple *ins)
{
ulong_t value, mask;
long_t log;
if (!is_const(ins)) {
return 0;
}
value = ins->u.cval;
log = log2(value);
if (log == -1) {
return 0;
}
mask = 1;
mask <<= log;
return ((value & mask) == value);
}
static ulong_t read_const(struct compile_state *state,
struct triple *ins, struct triple **expr)
{
struct triple *rhs;
rhs = *expr;
switch(rhs->type->type &TYPE_MASK) {
case TYPE_CHAR:
case TYPE_SHORT:
case TYPE_INT:
case TYPE_LONG:
case TYPE_UCHAR:
case TYPE_USHORT:
case TYPE_UINT:
case TYPE_ULONG:
case TYPE_POINTER:
break;
default:
internal_error(state, rhs, "bad type to read_const\n");
break;
}
return rhs->u.cval;
}
static long_t read_sconst(struct triple *ins, struct triple **expr)
{
struct triple *rhs;
rhs = *expr;
return (long_t)(rhs->u.cval);
}
static void unuse_rhs(struct compile_state *state, struct triple *ins)
{
struct triple **expr;
expr = triple_rhs(state, ins, 0);
for(;expr;expr = triple_rhs(state, ins, expr)) {
unuse_triple(*expr, ins);
*expr = 0;
}
}
static void check_lhs(struct compile_state *state, struct triple *ins)
{
struct triple **expr;
expr = triple_lhs(state, ins, 0);
for(;expr;expr = triple_lhs(state, ins, expr)) {
internal_error(state, ins, "unexpected lhs");
}
}
static void check_targ(struct compile_state *state, struct triple *ins)
{
struct triple **expr;
expr = triple_targ(state, ins, 0);
for(;expr;expr = triple_targ(state, ins, expr)) {
internal_error(state, ins, "unexpected targ");
}
}
static void wipe_ins(struct compile_state *state, struct triple *ins)
{
check_lhs(state, ins);
check_targ(state, ins);
unuse_rhs(state, ins);
if (ins->op == OP_PHI) {
xfree(ins->left);
ins->left = 0;
}
}
static void mkcopy(struct compile_state *state,
struct triple *ins, struct triple *rhs)
{
wipe_ins(state, ins);
ins->op = OP_COPY;
ins->left = rhs;
use_triple(ins->left, ins);
}
static void mkconst(struct compile_state *state,
struct triple *ins, ulong_t value)
{
if (!is_integral(ins) && !is_pointer(ins)) {
internal_error(state, ins, "unknown type to make constant\n");
}
wipe_ins(state, ins);
ins->op = OP_INTCONST;
ins->u.cval = value;
}
static void mkaddr_const(struct compile_state *state,
struct triple *ins, struct triple *sdecl, ulong_t value)
{
wipe_ins(state, ins);
ins->op = OP_ADDRCONST;
ins->left = sdecl;
ins->u.cval = value;
use_triple(sdecl, ins);
}
/* For those operations that cannot be simplified */
static void simplify_noop(struct compile_state *state, struct triple *ins)
{
return;
}
static void simplify_smul(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left) && !is_const(ins->right)) {
struct triple *tmp;
tmp = ins->left;
ins->left = ins->right;
ins->right = tmp;
}
if (is_const(ins->left) && is_const(ins->right)) {
long_t left, right;
left = read_sconst(ins, &ins->left);
right = read_sconst(ins, &ins->right);
mkconst(state, ins, left * right);
}
else if (is_zero(ins->right)) {
mkconst(state, ins, 0);
}
else if (is_one(ins->right)) {
mkcopy(state, ins, ins->left);
}
else if (is_pow2(ins->right)) {
struct triple *val;
val = int_const(state, ins->type, tlog2(ins->right));
ins->op = OP_SL;
insert_triple(state, ins, val);
unuse_triple(ins->right, ins);
use_triple(val, ins);
ins->right = val;
}
}
static void simplify_umul(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left) && !is_const(ins->right)) {
struct triple *tmp;
tmp = ins->left;
ins->left = ins->right;
ins->right = tmp;
}
if (is_const(ins->left) && is_const(ins->right)) {
ulong_t left, right;
left = read_const(state, ins, &ins->left);
right = read_const(state, ins, &ins->right);
mkconst(state, ins, left * right);
}
else if (is_zero(ins->right)) {
mkconst(state, ins, 0);
}
else if (is_one(ins->right)) {
mkcopy(state, ins, ins->left);
}
else if (is_pow2(ins->right)) {
struct triple *val;
val = int_const(state, ins->type, tlog2(ins->right));
ins->op = OP_SL;
insert_triple(state, ins, val);
unuse_triple(ins->right, ins);
use_triple(val, ins);
ins->right = val;
}
}
static void simplify_sdiv(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left) && is_const(ins->right)) {
long_t left, right;
left = read_sconst(ins, &ins->left);
right = read_sconst(ins, &ins->right);
mkconst(state, ins, left / right);
}
else if (is_zero(ins->left)) {
mkconst(state, ins, 0);
}
else if (is_zero(ins->right)) {
error(state, ins, "division by zero");
}
else if (is_one(ins->right)) {
mkcopy(state, ins, ins->left);
}
else if (is_pow2(ins->right)) {
struct triple *val;
val = int_const(state, ins->type, tlog2(ins->right));
ins->op = OP_SSR;
insert_triple(state, ins, val);
unuse_triple(ins->right, ins);
use_triple(val, ins);
ins->right = val;
}
}
static void simplify_udiv(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left) && is_const(ins->right)) {
ulong_t left, right;
left = read_const(state, ins, &ins->left);
right = read_const(state, ins, &ins->right);
mkconst(state, ins, left / right);
}
else if (is_zero(ins->left)) {
mkconst(state, ins, 0);
}
else if (is_zero(ins->right)) {
error(state, ins, "division by zero");
}
else if (is_one(ins->right)) {
mkcopy(state, ins, ins->left);
}
else if (is_pow2(ins->right)) {
struct triple *val;
val = int_const(state, ins->type, tlog2(ins->right));
ins->op = OP_USR;
insert_triple(state, ins, val);
unuse_triple(ins->right, ins);
use_triple(val, ins);
ins->right = val;
}
}
static void simplify_smod(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left) && is_const(ins->right)) {
long_t left, right;
left = read_const(state, ins, &ins->left);
right = read_const(state, ins, &ins->right);
mkconst(state, ins, left % right);
}
else if (is_zero(ins->left)) {
mkconst(state, ins, 0);
}
else if (is_zero(ins->right)) {
error(state, ins, "division by zero");
}
else if (is_one(ins->right)) {
mkconst(state, ins, 0);
}
else if (is_pow2(ins->right)) {
struct triple *val;
val = int_const(state, ins->type, ins->right->u.cval - 1);
ins->op = OP_AND;
insert_triple(state, ins, val);
unuse_triple(ins->right, ins);
use_triple(val, ins);
ins->right = val;
}
}
static void simplify_umod(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left) && is_const(ins->right)) {
ulong_t left, right;
left = read_const(state, ins, &ins->left);
right = read_const(state, ins, &ins->right);
mkconst(state, ins, left % right);
}
else if (is_zero(ins->left)) {
mkconst(state, ins, 0);
}
else if (is_zero(ins->right)) {
error(state, ins, "division by zero");
}
else if (is_one(ins->right)) {
mkconst(state, ins, 0);
}
else if (is_pow2(ins->right)) {
struct triple *val;
val = int_const(state, ins->type, ins->right->u.cval - 1);
ins->op = OP_AND;
insert_triple(state, ins, val);
unuse_triple(ins->right, ins);
use_triple(val, ins);
ins->right = val;
}
}
static void simplify_add(struct compile_state *state, struct triple *ins)
{
/* start with the pointer on the left */
if (is_pointer(ins->right)) {
struct triple *tmp;
tmp = ins->left;
ins->left = ins->right;
ins->right = tmp;
}
if (is_const(ins->left) && is_const(ins->right)) {
if (!is_pointer(ins->left)) {
ulong_t left, right;
left = read_const(state, ins, &ins->left);
right = read_const(state, ins, &ins->right);
mkconst(state, ins, left + right);
}
else {
struct triple *sdecl;
ulong_t left, right;
sdecl = ins->left->left;
left = ins->left->u.cval;
right = ins->right->u.cval;
mkaddr_const(state, ins, sdecl, left + right);
}
}
else if (is_const(ins->left) && !is_const(ins->right)) {
struct triple *tmp;
tmp = ins->right;
ins->right = ins->left;
ins->left = tmp;
}
}
static void simplify_sub(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left) && is_const(ins->right)) {
if (!is_pointer(ins->left)) {
ulong_t left, right;
left = read_const(state, ins, &ins->left);
right = read_const(state, ins, &ins->right);
mkconst(state, ins, left - right);
}
else {
struct triple *sdecl;
ulong_t left, right;
sdecl = ins->left->left;
left = ins->left->u.cval;
right = ins->right->u.cval;
mkaddr_const(state, ins, sdecl, left - right);
}
}
}
static void simplify_sl(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->right)) {
ulong_t right;
right = read_const(state, ins, &ins->right);
if (right >= (size_of(state, ins->type)*8)) {
warning(state, ins, "left shift count >= width of type");
}
}
if (is_const(ins->left) && is_const(ins->right)) {
ulong_t left, right;
left = read_const(state, ins, &ins->left);
right = read_const(state, ins, &ins->right);
mkconst(state, ins, left << right);
}
}
static void simplify_usr(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->right)) {
ulong_t right;
right = read_const(state, ins, &ins->right);
if (right >= (size_of(state, ins->type)*8)) {
warning(state, ins, "right shift count >= width of type");
}
}
if (is_const(ins->left) && is_const(ins->right)) {
ulong_t left, right;
left = read_const(state, ins, &ins->left);
right = read_const(state, ins, &ins->right);
mkconst(state, ins, left >> right);
}
}
static void simplify_ssr(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->right)) {
ulong_t right;
right = read_const(state, ins, &ins->right);
if (right >= (size_of(state, ins->type)*8)) {
warning(state, ins, "right shift count >= width of type");
}
}
if (is_const(ins->left) && is_const(ins->right)) {
long_t left, right;
left = read_sconst(ins, &ins->left);
right = read_sconst(ins, &ins->right);
mkconst(state, ins, left >> right);
}
}
static void simplify_and(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left) && is_const(ins->right)) {
ulong_t left, right;
left = read_const(state, ins, &ins->left);
right = read_const(state, ins, &ins->right);
mkconst(state, ins, left & right);
}
}
static void simplify_or(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left) && is_const(ins->right)) {
ulong_t left, right;
left = read_const(state, ins, &ins->left);
right = read_const(state, ins, &ins->right);
mkconst(state, ins, left | right);
}
}
static void simplify_xor(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left) && is_const(ins->right)) {
ulong_t left, right;
left = read_const(state, ins, &ins->left);
right = read_const(state, ins, &ins->right);
mkconst(state, ins, left ^ right);
}
}
static void simplify_pos(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left)) {
mkconst(state, ins, ins->left->u.cval);
}
else {
mkcopy(state, ins, ins->left);
}
}
static void simplify_neg(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left)) {
ulong_t left;
left = read_const(state, ins, &ins->left);
mkconst(state, ins, -left);
}
else if (ins->left->op == OP_NEG) {
mkcopy(state, ins, ins->left->left);
}
}
static void simplify_invert(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left)) {
ulong_t left;
left = read_const(state, ins, &ins->left);
mkconst(state, ins, ~left);
}
}
static void simplify_eq(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left) && is_const(ins->right)) {
ulong_t left, right;
left = read_const(state, ins, &ins->left);
right = read_const(state, ins, &ins->right);
mkconst(state, ins, left == right);
}
else if (ins->left == ins->right) {
mkconst(state, ins, 1);
}
}
static void simplify_noteq(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left) && is_const(ins->right)) {
ulong_t left, right;
left = read_const(state, ins, &ins->left);
right = read_const(state, ins, &ins->right);
mkconst(state, ins, left != right);
}
else if (ins->left == ins->right) {
mkconst(state, ins, 0);
}
}
static void simplify_sless(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left) && is_const(ins->right)) {
long_t left, right;
left = read_sconst(ins, &ins->left);
right = read_sconst(ins, &ins->right);
mkconst(state, ins, left < right);
}
else if (ins->left == ins->right) {
mkconst(state, ins, 0);
}
}
static void simplify_uless(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left) && is_const(ins->right)) {
ulong_t left, right;
left = read_const(state, ins, &ins->left);
right = read_const(state, ins, &ins->right);
mkconst(state, ins, left < right);
}
else if (is_zero(ins->left)) {
mkconst(state, ins, 1);
}
else if (ins->left == ins->right) {
mkconst(state, ins, 0);
}
}
static void simplify_smore(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left) && is_const(ins->right)) {
long_t left, right;
left = read_sconst(ins, &ins->left);
right = read_sconst(ins, &ins->right);
mkconst(state, ins, left > right);
}
else if (ins->left == ins->right) {
mkconst(state, ins, 0);
}
}
static void simplify_umore(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left) && is_const(ins->right)) {
ulong_t left, right;
left = read_const(state, ins, &ins->left);
right = read_const(state, ins, &ins->right);
mkconst(state, ins, left > right);
}
else if (is_zero(ins->right)) {
mkconst(state, ins, 1);
}
else if (ins->left == ins->right) {
mkconst(state, ins, 0);
}
}
static void simplify_slesseq(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left) && is_const(ins->right)) {
long_t left, right;
left = read_sconst(ins, &ins->left);
right = read_sconst(ins, &ins->right);
mkconst(state, ins, left <= right);
}
else if (ins->left == ins->right) {
mkconst(state, ins, 1);
}
}
static void simplify_ulesseq(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left) && is_const(ins->right)) {
ulong_t left, right;
left = read_const(state, ins, &ins->left);
right = read_const(state, ins, &ins->right);
mkconst(state, ins, left <= right);
}
else if (is_zero(ins->left)) {
mkconst(state, ins, 1);
}
else if (ins->left == ins->right) {
mkconst(state, ins, 1);
}
}
static void simplify_smoreeq(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left) && is_const(ins->right)) {
long_t left, right;
left = read_sconst(ins, &ins->left);
right = read_sconst(ins, &ins->right);
mkconst(state, ins, left >= right);
}
else if (ins->left == ins->right) {
mkconst(state, ins, 1);
}
}
static void simplify_umoreeq(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left) && is_const(ins->right)) {
ulong_t left, right;
left = read_const(state, ins, &ins->left);
right = read_const(state, ins, &ins->right);
mkconst(state, ins, left >= right);
}
else if (is_zero(ins->right)) {
mkconst(state, ins, 1);
}
else if (ins->left == ins->right) {
mkconst(state, ins, 1);
}
}
static void simplify_lfalse(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left)) {
ulong_t left;
left = read_const(state, ins, &ins->left);
mkconst(state, ins, left == 0);
}
/* Otherwise if I am the only user... */
else if ((ins->left->use->member == ins) && (ins->left->use->next == 0)) {
int need_copy = 1;
/* Invert a boolean operation */
switch(ins->left->op) {
case OP_LTRUE: ins->left->op = OP_LFALSE; break;
case OP_LFALSE: ins->left->op = OP_LTRUE; break;
case OP_EQ: ins->left->op = OP_NOTEQ; break;
case OP_NOTEQ: ins->left->op = OP_EQ; break;
case OP_SLESS: ins->left->op = OP_SMOREEQ; break;
case OP_ULESS: ins->left->op = OP_UMOREEQ; break;
case OP_SMORE: ins->left->op = OP_SLESSEQ; break;
case OP_UMORE: ins->left->op = OP_ULESSEQ; break;
case OP_SLESSEQ: ins->left->op = OP_SMORE; break;
case OP_ULESSEQ: ins->left->op = OP_UMORE; break;
case OP_SMOREEQ: ins->left->op = OP_SLESS; break;
case OP_UMOREEQ: ins->left->op = OP_ULESS; break;
default:
need_copy = 0;
break;
}
if (need_copy) {
mkcopy(state, ins, ins->left);
}
}
}
static void simplify_ltrue (struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left)) {
ulong_t left;
left = read_const(state, ins, &ins->left);
mkconst(state, ins, left != 0);
}
else switch(ins->left->op) {
case OP_LTRUE: case OP_LFALSE: case OP_EQ: case OP_NOTEQ:
case OP_SLESS: case OP_ULESS: case OP_SMORE: case OP_UMORE:
case OP_SLESSEQ: case OP_ULESSEQ: case OP_SMOREEQ: case OP_UMOREEQ:
mkcopy(state, ins, ins->left);
}
}
static void simplify_copy(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left)) {
switch(ins->left->op) {
case OP_INTCONST:
{
ulong_t left;
left = read_const(state, ins, &ins->left);
mkconst(state, ins, left);
break;
}
case OP_ADDRCONST:
{
struct triple *sdecl;
ulong_t offset;
sdecl = ins->left;
offset = ins->u.cval;
mkaddr_const(state, ins, sdecl, offset);
break;
}
default:
internal_error(state, ins, "uknown constant");
break;
}
}
}
static void simplify_dot(struct compile_state *state, struct triple *ins)
{
FINISHME();
}
static void simplify_branch(struct compile_state *state, struct triple *ins)
{
struct block *block;
if (ins->op != OP_BRANCH) {
internal_error(state, ins, "not branch");
}
if (ins->use != 0) {
internal_error(state, ins, "branch use");
}
#warning "FIXME implement simplify branch."
/* The challenge here with simplify branch is that I need to
* make modifications to the control flow graph as well
* as to the branch instruction itself.
*/
block = ins->u.block;
if (ins->right && is_const(ins->right)) {
ulong_t value;
value = read_const(state, ins, &ins->right);
unuse_triple(ins->right, ins);
ins->right = 0;
if (value) {
unuse_triple(ins->next, ins);
}
else {
unuse_triple(ins->left, ins);
ins->left = ins->next;
}
#warning "FIXME handle the case of making a branch unconditional"
}
if (ins->left == ins->next) {
unuse_triple(ins->left, ins);
if (ins->right) {
unuse_triple(ins->right, ins);
unuse_triple(ins->next, ins);
}
ins->op = OP_NOOP;
ins->left = 0;
ins->right = 0;
if (ins->use) {
internal_error(state, ins, "noop use != 0");
}
#warning "FIXME handle the case of killing a branch"
}
}
static void simplify_phi(struct compile_state *state, struct triple *ins)
{
struct triple **expr;
ulong_t value;
expr = triple_rhs(state, ins, 0);
if (!is_const(*expr)) {
return;
}
value = read_const(state, ins, expr);
for(;expr;expr = triple_rhs(state, ins, expr)) {
if (!is_const(*expr)) {
return;
}
if (value != read_const(state, ins, expr)) {
return;
}
}
mkconst(state, ins, value);
}
static void simplify_bsf(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left)) {
ulong_t left;
left = read_const(state, ins, &ins->left);
mkconst(state, ins, bsf(left));
}
}
static void simplify_bsr(struct compile_state *state, struct triple *ins)
{
if (is_const(ins->left)) {
ulong_t left;
left = read_const(state, ins, &ins->left);
mkconst(state, ins, bsr(left));
}
}
typedef void (*simplify_t)(struct compile_state *state, struct triple *ins);
static const simplify_t table_simplify[] = {
#if 0
#define simplify_smul simplify_noop
#define simplify_umul simplify_noop
#define simplify_sdiv simplify_noop
#define simplify_udiv simplify_noop
#define simplify_smod simplify_noop
#define simplify_umod simplify_noop
#endif
#if 0
#define simplify_add simplify_noop
#define simplify_sub simplify_noop
#endif
#if 0
#define simplify_sl simplify_noop
#define simplify_usr simplify_noop
#define simplify_ssr simplify_noop
#endif
#if 0
#define simplify_and simplify_noop
#define simplify_xor simplify_noop
#define simplify_or simplify_noop
#endif
#if 0
#define simplify_pos simplify_noop
#define simplify_neg simplify_noop
#define simplify_invert simplify_noop
#endif
#if 0
#define simplify_eq simplify_noop
#define simplify_noteq simplify_noop
#endif
#if 0
#define simplify_sless simplify_noop
#define simplify_uless simplify_noop
#define simplify_smore simplify_noop
#define simplify_umore simplify_noop
#endif
#if 0
#define simplify_slesseq simplify_noop
#define simplify_ulesseq simplify_noop
#define simplify_smoreeq simplify_noop
#define simplify_umoreeq simplify_noop
#endif
#if 0
#define simplify_lfalse simplify_noop
#endif
#if 0
#define simplify_ltrue simplify_noop
#endif
#if 0
#define simplify_copy simplify_noop
#endif
#if 0
#define simplify_dot simplify_noop
#endif
#if 0
#define simplify_branch simplify_noop
#endif
#if 0
#define simplify_phi simplify_noop
#endif
#if 0
#define simplify_bsf simplify_noop
#define simplify_bsr simplify_noop
#endif
[OP_SMUL ] = simplify_smul,
[OP_UMUL ] = simplify_umul,
[OP_SDIV ] = simplify_sdiv,
[OP_UDIV ] = simplify_udiv,
[OP_SMOD ] = simplify_smod,
[OP_UMOD ] = simplify_umod,
[OP_ADD ] = simplify_add,
[OP_SUB ] = simplify_sub,
[OP_SL ] = simplify_sl,
[OP_USR ] = simplify_usr,
[OP_SSR ] = simplify_ssr,
[OP_AND ] = simplify_and,
[OP_XOR ] = simplify_xor,
[OP_OR ] = simplify_or,
[OP_POS ] = simplify_pos,
[OP_NEG ] = simplify_neg,
[OP_INVERT ] = simplify_invert,
[OP_EQ ] = simplify_eq,
[OP_NOTEQ ] = simplify_noteq,
[OP_SLESS ] = simplify_sless,
[OP_ULESS ] = simplify_uless,
[OP_SMORE ] = simplify_smore,
[OP_UMORE ] = simplify_umore,
[OP_SLESSEQ ] = simplify_slesseq,
[OP_ULESSEQ ] = simplify_ulesseq,
[OP_SMOREEQ ] = simplify_smoreeq,
[OP_UMOREEQ ] = simplify_umoreeq,
[OP_LFALSE ] = simplify_lfalse,
[OP_LTRUE ] = simplify_ltrue,
[OP_LOAD ] = simplify_noop,
[OP_STORE ] = simplify_noop,
[OP_NOOP ] = simplify_noop,
[OP_INTCONST ] = simplify_noop,
[OP_BLOBCONST ] = simplify_noop,
[OP_ADDRCONST ] = simplify_noop,
[OP_WRITE ] = simplify_noop,
[OP_READ ] = simplify_noop,
[OP_COPY ] = simplify_copy,
[OP_DOT ] = simplify_dot,
[OP_LIST ] = simplify_noop,
[OP_BRANCH ] = simplify_branch,
[OP_LABEL ] = simplify_noop,
[OP_ADECL ] = simplify_noop,
[OP_SDECL ] = simplify_noop,
[OP_PHI ] = simplify_phi,
[OP_INB ] = simplify_noop,
[OP_INW ] = simplify_noop,
[OP_INL ] = simplify_noop,
[OP_OUTB ] = simplify_noop,
[OP_OUTW ] = simplify_noop,
[OP_OUTL ] = simplify_noop,
[OP_BSF ] = simplify_bsf,
[OP_BSR ] = simplify_bsr,
};
static void simplify(struct compile_state *state, struct triple *ins)
{
int op;
simplify_t do_simplify;
do {
op = ins->op;
do_simplify = 0;
if ((op < 0) || (op > sizeof(table_simplify)/sizeof(table_simplify[0]))) {
do_simplify = 0;
}
else {
do_simplify = table_simplify[op];
}
if (!do_simplify) {
internal_error(state, ins, "cannot simplify op: %d %s\n",
op, tops(op));
return;
}
do_simplify(state, ins);
} while(ins->op != op);
}
static void simplify_all(struct compile_state *state)
{
struct triple *ins, *first;
first = state->main_function->left;
ins = first;
do {
simplify(state, ins);
ins = ins->next;
} while(ins != first);
}
/*
* Builtins....
* ============================
*/
static void register_builtin_unary(struct compile_state *state,
const char *name, int op, struct type *result, struct type *a1type)
{
struct type *ftype, *rtype, *atype;
struct triple *def, *arg1, *work, *last, *first;
struct hash_entry *ident;
int name_len;
/* Dummy file state to get debug handling right */
struct file_state file;
memset(&file, 0, sizeof(file));
file.basename = name;
file.line = 1;
file.prev = state->file;
state->file = &file;
atype = a1type;
rtype = result;
ftype = new_type(TYPE_FUNCTION, rtype, atype);
/* Generate the needed triples */
def = triple(state, OP_LIST, ftype, 0, 0);
first = label(state);
def->left = first;
/* Now string them together into a list */
arg1 = 0;
if ((atype->type & TYPE_MASK) != TYPE_VOID) {
arg1 = flatten(state, first, variable(state, a1type));
}
def->right = 0;
if ((rtype->type & TYPE_MASK) != TYPE_VOID) {
def->right = flatten(state, first, variable(state, rtype));
}
work = triple(state, op, rtype, read_expr(state, arg1), 0);
if (def->right) {
work = write_expr(state, def->right, work);
}
work = flatten(state, first, work);
last = flatten(state, first, label(state));
name_len = strlen(name);
ident = lookup(state, name, name_len);
symbol(state, ident, &ident->sym_ident, def, ftype);
state->file = file.prev;
#if 0
fprintf(stdout, "\n");
loc(stdout, state, 0);
fprintf(stdout, "\n__________ builtin_unary _________\n");
print_triple(state, def);
fprintf(stdout, "__________ builtin_unary _________ done\n\n");
#endif
}
static void register_builtin_binary(struct compile_state *state,
const char *name, int op,
struct type *result, struct type *a1type, struct type *a2type)
{
struct type *ftype, *rtype, *atype;
struct triple *def, *arg1, *arg2, *work, *last, *first;
struct hash_entry *ident;
int name_len;
/* Dummy file state to get debug handling right */
struct file_state file;
memset(&file, 0, sizeof(file));
file.basename = name;
file.line = 1;
file.prev = state->file;
state->file = &file;
atype = new_type(TYPE_PRODUCT, a1type, a2type);
rtype = result;
ftype = new_type(TYPE_FUNCTION, rtype, atype);
/* Generate the needed triples */
def = triple(state, OP_LIST, ftype, 0, 0);
first = label(state);
def->left = first;
/* String them togher */
arg1 = flatten(state, first, variable(state, a1type));
arg2 = flatten(state, first, variable(state, a2type));
def->right = 0;
if ((rtype->type & TYPE_MASK) != TYPE_VOID) {
def->right = flatten(state, first, variable(state, rtype));
}
work = triple(state, op, rtype,
read_expr(state, arg1), read_expr(state, arg2));
if (def->right) {
work = write_expr(state, def->right, work);
}
work = flatten(state, first, work);
last = flatten(state, first, label(state));
name_len = strlen(name);
ident = lookup(state, name, name_len);
symbol(state, ident, &ident->sym_ident, def, ftype);
state->file = file.prev;
#if 0
fprintf(stdout, "\n");
loc(stdout, state, 0);
fprintf(stdout, "\n__________ builtin_binary _________\n");
print_triple(state, def);
fprintf(stdout, "__________ builtin_binary _________ done\n\n");
#endif
}
static void register_builtins(struct compile_state *state)
{
register_builtin_unary(state, "__builtin_inb", OP_INB,
&uchar_type, &ushort_type);
register_builtin_unary(state, "__builtin_inw", OP_INW,
&ushort_type, &ushort_type);
register_builtin_unary( state, "__builtin_inl", OP_INL,
&uint_type, &ushort_type);
register_builtin_binary(state, "__builtin_outb", OP_OUTB,
&void_type, &uchar_type, &ushort_type);
register_builtin_binary(state, "__builtin_outw", OP_OUTW,
&void_type, &ushort_type, &ushort_type);
register_builtin_binary(state, "__builtin_outl", OP_OUTL,
&void_type, &uint_type, &ushort_type);
register_builtin_unary(state, "__builtin_bsf", OP_BSF,
&int_type, &int_type);
register_builtin_unary(state, "__builtin_bsr", OP_BSR,
&int_type, &int_type);
register_builtin_unary(state, "__builtin_hlt", OP_HLT,
&void_type, &void_type);
}
static struct type *declarator(
struct compile_state *state, struct type *type,
struct hash_entry **ident, int need_ident);
static void decl(struct compile_state *state, struct triple *first);
static struct type *specifier_qualifier_list(struct compile_state *state);
static int isdecl_specifier(int tok);
static struct type *decl_specifiers(struct compile_state *state);
static int istype(int tok);
static struct triple *expr(struct compile_state *state);
static struct triple *assignment_expr(struct compile_state *state);
static struct type *type_name(struct compile_state *state);
static void statement(struct compile_state *state, struct triple *fist);
static struct triple *call_expr(
struct compile_state *state, struct triple *func)
{
struct triple *def, **next;
struct type *type;
if ((func->type->type & TYPE_MASK) != TYPE_FUNCTION) {
error(state, 0, "Called object is not a function");
}
if (func->op != OP_LIST) {
internal_error(state, 0, "improper function");
}
eat(state, TOK_LPAREN);
/* Find the return type without any specifiers */
type = clone_type(0, func->type->left);
def = triple(state, OP_CALL, type, func, 0);
next = &def->right;
if (peek(state) != TOK_RPAREN) {
struct triple *val;
struct type *param, *arg_type;
val = read_expr(state, assignment_expr(state));
param = func->type->right;
arg_type = param;
if ((param->type & TYPE_MASK) == TYPE_PRODUCT) {
arg_type = param->left;
}
else if ((param->type & TYPE_MASK) == TYPE_VOID) {
error(state, 0, "Too many arguments");
}
write_compatible(state, arg_type, val->type);
*next = val;
while(peek(state) == TOK_COMMA) {
eat(state, TOK_COMMA);
val = read_expr(state, assignment_expr(state));
if (arg_type == param) {
error(state, 0, "Too many arguments");
}
arg_type = param = param->right;
if ((param->type & TYPE_MASK) == TYPE_PRODUCT) {
arg_type = param->left;
}
write_compatible(state, arg_type, val->type);
*next = triple(state, OP_PRODUCT, &void_type, *next, val);
next = &((*next)->right);
}
}
eat(state, TOK_RPAREN);
return def;
}
static struct triple *character_constant(struct compile_state *state)
{
struct triple *def;
struct token *tk;
const signed char *str, *end;
int c;
int str_len;
eat(state, TOK_LIT_CHAR);
tk = &state->token[0];
str = tk->val.str + 1;
str_len = tk->str_len - 2;
if (str_len <= 0) {
error(state, 0, "empty character constant");
}
end = str + str_len;
c = char_value(state, &str, end);
if (str != end) {
error(state, 0, "multibyte character constant not supported");
}
def = int_const(state, &char_type, (ulong_t)((long_t)c));
return def;
}
static struct triple *string_constant(struct compile_state *state)
{
struct triple *def;
struct token *tk;
struct type *type;
const signed char *str, *end;
signed char *buf, *ptr;
int str_len;
buf = 0;
type = new_type(TYPE_ARRAY, &char_type, 0);
type->elements = 0;
/* The while loop handles string concatenation */
do {
eat(state, TOK_LIT_STRING);
tk = &state->token[0];
str = tk->val.str + 1;
str_len = tk->str_len - 2;
if (str_len <= 0) {
error(state, 0, "empty string constant");
}
end = str + str_len;
ptr = buf;
buf = xmalloc(type->elements + str_len + 1, "string_constant");
memcpy(buf, ptr, type->elements);
ptr = buf + type->elements;
do {
*ptr++ = char_value(state, &str, end);
} while(str < end);
type->elements = ptr - buf;
} while(peek(state) == TOK_LIT_STRING);
*ptr = '\0';
type->elements += 1;
def = triple(state, OP_BLOBCONST, type, 0, 0);
def->u.blob = buf;
return def;
}
static struct triple *integer_constant(struct compile_state *state)
{
struct triple *def;
unsigned long val;
struct token *tk;
char *end;
int u, l, decimal;
struct type *type;
eat(state, TOK_LIT_INT);
tk = &state->token[0];
errno = 0;
decimal = (tk->val.str[0] != '0');
val = strtoul(tk->val.str, &end, 0);
if ((val == ULONG_MAX) && (errno == ERANGE)) {
error(state, 0, "Integer constant to large");
}
u = l = 0;
if ((*end == 'u') || (*end == 'U')) {
u = 1;
end++;
}
if ((*end == 'l') || (*end == 'L')) {
l = 1;
end++;
}
if ((*end == 'u') || (*end == 'U')) {
u = 1;
end++;
}
if (*end) {
error(state, 0, "Junk at end of integer constant");
}
if (u && l) {
type = &ulong_type;
}
else if (l) {
type = &long_type;
if (!decimal && (val > LONG_MAX)) {
type = &ulong_type;
}
}
else if (u) {
type = &uint_type;
if (val > UINT_MAX) {
type = &ulong_type;
}
}
else {
type = &int_type;
if (!decimal && (val > INT_MAX) && (val <= UINT_MAX)) {
type = &uint_type;
}
else if (!decimal && (val > LONG_MAX)) {
type = &ulong_type;
}
else if (val > INT_MAX) {
type = &long_type;
}
}
def = int_const(state, type, val);
return def;
}
static struct triple *primary_expr(struct compile_state *state)
{
struct triple *def;
int tok;
tok = peek(state);
switch(tok) {
case TOK_IDENT:
{
struct hash_entry *ident;
/* Here ident is either:
* a varable name
* a function name
* an enumeration constant.
*/
eat(state, TOK_IDENT);
ident = state->token[0].ident;
if (!ident->sym_ident) {
error(state, 0, "%s undeclared", ident->name);
}
def = ident->sym_ident->def;
break;
}
case TOK_ENUM_CONST:
/* Here ident is an enumeration constant */
eat(state, TOK_ENUM_CONST);
def = 0;
FINISHME();
break;
case TOK_LPAREN:
eat(state, TOK_LPAREN);
def = expr(state);
eat(state, TOK_RPAREN);
break;
case TOK_LIT_INT:
def = integer_constant(state);
break;
case TOK_LIT_FLOAT:
eat(state, TOK_LIT_FLOAT);
error(state, 0, "Floating point constants not supported");
def = 0;
FINISHME();
break;
case TOK_LIT_CHAR:
def = character_constant(state);
break;
case TOK_LIT_STRING:
def = string_constant(state);
break;
default:
def = 0;
error(state, 0, "Unexpected token: %s\n", tokens[tok]);
}
return def;
}
static struct triple *postfix_expr(struct compile_state *state)
{
struct triple *def;
int postfix;
def = primary_expr(state);
do {
struct triple *left;
int tok;
postfix = 1;
left = def;
switch((tok = peek(state))) {
case TOK_LBRACKET:
eat(state, TOK_LBRACKET);
def = mk_subscript_expr(state, left, expr(state));
eat(state, TOK_RBRACKET);
break;
case TOK_LPAREN:
def = call_expr(state, def);
break;
case TOK_DOT:
eat(state, TOK_DOT);
eat(state, TOK_IDENT);
FINISHME();
break;
case TOK_ARROW:
eat(state, TOK_ARROW);
eat(state, TOK_IDENT);
FINISHME();
break;
case TOK_PLUSPLUS:
eat(state, TOK_PLUSPLUS);
def = mk_post_inc_expr(state, left);
break;
case TOK_MINUSMINUS:
eat(state, TOK_MINUSMINUS);
def = mk_post_dec_expr(state, left);
break;
default:
postfix = 0;
break;
}
} while(postfix);
return def;
}
static struct triple *cast_expr(struct compile_state *state);
static struct triple *unary_expr(struct compile_state *state)
{
struct triple *def, *right;
int tok;
switch((tok = peek(state))) {
case TOK_PLUSPLUS:
eat(state, TOK_PLUSPLUS);
def = mk_pre_inc_expr(state, unary_expr(state));
break;
case TOK_MINUSMINUS:
eat(state, TOK_MINUSMINUS);
def = mk_pre_dec_expr(state, unary_expr(state));
break;
case TOK_AND:
eat(state, TOK_AND);
def = mk_addr_expr(state, cast_expr(state), 0);
break;
case TOK_STAR:
eat(state, TOK_STAR);
def = mk_deref_expr(state, read_expr(state, cast_expr(state)));
break;
case TOK_PLUS:
eat(state, TOK_PLUS);
right = read_expr(state, cast_expr(state));
arithmetic(state, right);
def = integral_promotion(state, right);
break;
case TOK_MINUS:
eat(state, TOK_MINUS);
right = read_expr(state, cast_expr(state));
arithmetic(state, right);
def = integral_promotion(state, right);
def = triple(state, OP_NEG, def->type, def, 0);
break;
case TOK_TILDE:
eat(state, TOK_TILDE);
right = read_expr(state, cast_expr(state));
integral(state, right);
def = integral_promotion(state, right);
def = triple(state, OP_INVERT, def->type, def, 0);
break;
case TOK_BANG:
eat(state, TOK_BANG);
right = read_expr(state, cast_expr(state));
bool(state, right);
def = lfalse_expr(state, right);
break;
case TOK_SIZEOF:
{
struct type *type;
int tok1, tok2;
eat(state, TOK_SIZEOF);
tok1 = peek(state);
tok2 = peek2(state);
if ((tok1 == TOK_LPAREN) && istype(tok2)) {
eat(state, TOK_LPAREN);
type = type_name(state);
eat(state, TOK_RPAREN);
}
else {
struct triple *expr;
expr = unary_expr(state);
type = expr->type;
release_expr(state, expr);
}
def = int_const(state, &ulong_type, size_of(state, type));
break;
}
case TOK_ALIGNOF:
{
struct type *type;
int tok1, tok2;
eat(state, TOK_ALIGNOF);
tok1 = peek(state);
tok2 = peek2(state);
if ((tok1 == TOK_LPAREN) && istype(tok2)) {
eat(state, TOK_LPAREN);
type = type_name(state);
eat(state, TOK_RPAREN);
}
else {
struct triple *expr;
expr = unary_expr(state);
type = expr->type;
release_expr(state, expr);
}
def = int_const(state, &ulong_type, align_of(state, type));
break;
}
default:
def = postfix_expr(state);
break;
}
return def;
}
static struct triple *cast_expr(struct compile_state *state)
{
struct triple *def;
int tok1, tok2;
tok1 = peek(state);
tok2 = peek2(state);
if ((tok1 == TOK_LPAREN) && istype(tok2)) {
struct type *type;
eat(state, TOK_LPAREN);
type = type_name(state);
eat(state, TOK_RPAREN);
def = read_expr(state, cast_expr(state));
def = triple(state, OP_COPY, type, def, 0);
#warning "FIXME do I need an OP_CAST expr to be semantically correct here?"
}
else {
def = unary_expr(state);
}
return def;
}
static struct triple *mult_expr(struct compile_state *state)
{
struct triple *def;
int done;
def = cast_expr(state);
do {
struct triple *left, *right;
struct type *result_type;
int tok, op, sign;
done = 0;
switch(tok = (peek(state))) {
case TOK_STAR:
case TOK_DIV:
case TOK_MOD:
left = read_expr(state, def);
arithmetic(state, left);
eat(state, tok);
right = read_expr(state, cast_expr(state));
arithmetic(state, right);
result_type = arithmetic_result(state, left, right);
sign = is_signed(result_type);
op = -1;
switch(tok) {
case TOK_STAR: op = sign? OP_SMUL : OP_UMUL; break;
case TOK_DIV: op = sign? OP_SDIV : OP_UDIV; break;
case TOK_MOD: op = sign? OP_SMOD : OP_UMOD; break;
}
def = triple(state, op, result_type, left, right);
break;
default:
done = 1;
break;
}
} while(!done);
return def;
}
static struct triple *add_expr(struct compile_state *state)
{
struct triple *def;
int done;
def = mult_expr(state);
do {
done = 0;
switch( peek(state)) {
case TOK_PLUS:
eat(state, TOK_PLUS);
def = mk_add_expr(state, def, mult_expr(state));
break;
case TOK_MINUS:
eat(state, TOK_MINUS);
def = mk_sub_expr(state, def, mult_expr(state));
break;
default:
done = 1;
break;
}
} while(!done);
return def;
}
static struct triple *shift_expr(struct compile_state *state)
{
struct triple *def;
int done;
def = add_expr(state);
do {
struct triple *left, *right;
int tok, op;
done = 0;
switch((tok = peek(state))) {
case TOK_SL:
case TOK_SR:
left = read_expr(state, def);
integral(state, left);
left = integral_promotion(state, left);
eat(state, tok);
right = read_expr(state, add_expr(state));
integral(state, right);
right = integral_promotion(state, right);
op = (tok == TOK_SL)? OP_SL :
is_signed(left->type)? OP_SSR: OP_USR;
def = triple(state, op, left->type, left, right);
break;
default:
done = 1;
break;
}
} while(!done);
return def;
}
static struct triple *relational_expr(struct compile_state *state)
{
#warning "Extend relational exprs to work on more than arithmetic types"
struct triple *def;
int done;
def = shift_expr(state);
do {
struct triple *left, *right;
struct type *arg_type;
int tok, op, sign;
done = 0;
switch((tok = peek(state))) {
case TOK_LESS:
case TOK_MORE:
case TOK_LESSEQ:
case TOK_MOREEQ:
left = read_expr(state, def);
arithmetic(state, left);
eat(state, tok);
right = read_expr(state, shift_expr(state));
arithmetic(state, right);
arg_type = arithmetic_result(state, left, right);
sign = is_signed(arg_type);
op = -1;
switch(tok) {
case TOK_LESS: op = sign? OP_SLESS : OP_ULESS; break;
case TOK_MORE: op = sign? OP_SMORE : OP_UMORE; break;
case TOK_LESSEQ: op = sign? OP_SLESSEQ : OP_ULESSEQ; break;
case TOK_MOREEQ: op = sign? OP_SMOREEQ : OP_UMOREEQ; break;
}
def = triple(state, op, &int_type, left, right);
break;
default:
done = 1;
break;
}
} while(!done);
return def;
}
static struct triple *equality_expr(struct compile_state *state)
{
#warning "Extend equality exprs to work on more than arithmetic types"
struct triple *def;
int done;
def = relational_expr(state);
do {
struct triple *left, *right;
int tok, op;
done = 0;
switch((tok = peek(state))) {
case TOK_EQEQ:
case TOK_NOTEQ:
left = read_expr(state, def);
arithmetic(state, left);
eat(state, tok);
right = read_expr(state, relational_expr(state));
arithmetic(state, right);
op = (tok == TOK_EQEQ) ? OP_EQ: OP_NOTEQ;
def = triple(state, op, &int_type, left, right);
break;
default:
done = 1;
break;
}
} while(!done);
return def;
}
static struct triple *and_expr(struct compile_state *state)
{
struct triple *def;
def = equality_expr(state);
while(peek(state) == TOK_AND) {
struct triple *left, *right;
struct type *result_type;
left = read_expr(state, def);
integral(state, left);
eat(state, TOK_AND);
right = read_expr(state, equality_expr(state));
integral(state, right);
result_type = arithmetic_result(state, left, right);
def = triple(state, OP_AND, result_type, left, right);
}
return def;
}
static struct triple *xor_expr(struct compile_state *state)
{
struct triple *def;
def = and_expr(state);
while(peek(state) == TOK_XOR) {
struct triple *left, *right;
struct type *result_type;
left = read_expr(state, def);
integral(state, left);
eat(state, TOK_XOR);
right = read_expr(state, and_expr(state));
integral(state, right);
result_type = arithmetic_result(state, left, right);
def = triple(state, OP_XOR, result_type, left, right);
}
return def;
}
static struct triple *or_expr(struct compile_state *state)
{
struct triple *def;
def = xor_expr(state);
while(peek(state) == TOK_OR) {
struct triple *left, *right;
struct type *result_type;
left = read_expr(state, def);
integral(state, left);
eat(state, TOK_OR);
right = read_expr(state, xor_expr(state));
integral(state, right);
result_type = arithmetic_result(state, left, right);
def = triple(state, OP_OR, result_type, left, right);
}
return def;
}
static struct triple *land_expr(struct compile_state *state)
{
struct triple *def;
def = or_expr(state);
while(peek(state) == TOK_LOGAND) {
struct triple *left, *right;
left = read_expr(state, def);
bool(state, left);
eat(state, TOK_LOGAND);
right = read_expr(state, or_expr(state));
bool(state, right);
def = triple(state, OP_LAND, &int_type,
ltrue_expr(state, left),
ltrue_expr(state, right));
}
return def;
}
static struct triple *lor_expr(struct compile_state *state)
{
struct triple *def;
def = land_expr(state);
while(peek(state) == TOK_LOGOR) {
struct triple *left, *right;
left = read_expr(state, def);
bool(state, left);
eat(state, TOK_LOGOR);
right = read_expr(state, land_expr(state));
bool(state, right);
def = triple(state, OP_LOR, &int_type,
ltrue_expr(state, left),
ltrue_expr(state, right));
}
return def;
}
static struct triple *conditional_expr(struct compile_state *state)
{
struct triple *def;
def = lor_expr(state);
if (peek(state) == TOK_QUEST) {
struct triple *test, *left, *right;
bool(state, def);
test = ltrue_expr(state, read_expr(state, def));
eat(state, TOK_QUEST);
left = read_expr(state, expr(state));
eat(state, TOK_COLON);
right = read_expr(state, conditional_expr(state));
def = cond_expr(state, test, left, right);
}
return def;
}
static struct triple *eval_const_expr(
struct compile_state *state, struct triple *expr)
{
struct triple *def;
struct triple *head, *ptr;
head = label(state); /* dummy initial triple */
flatten(state, head, expr);
for(ptr = head->next; ptr != head; ptr = ptr->next) {
simplify(state, ptr);
}
/* Remove the constant value the tail of the list */
def = head->prev;
def->prev->next = def->next;
def->next->prev = def->prev;
def->next = def->prev = def;
if (!is_const(def)) {
internal_error(state, 0, "Not a constant expression");
}
/* Free the intermediate expressions */
while(head->next != head) {
release_triple(state, head->next);
}
free_triple(state, head);
return def;
}
static struct triple *constant_expr(struct compile_state *state)
{
return eval_const_expr(state, conditional_expr(state));
}
static struct triple *assignment_expr(struct compile_state *state)
{
struct triple *def, *left, *right;
int tok, op, sign;
/* The C grammer in K&R shows assignment expressions
* only taking unary expressions as input on their
* left hand side. But specifies the precedence of
* assignemnt as the lowest operator except for comma.
*
* Allowing conditional expressions on the left hand side
* of an assignement results in a grammar that accepts
* a larger set of statements than standard C. As long
* as the subset of the grammar that is standard C behaves
* correctly this should cause no problems.
*
* For the extra token strings accepted by the grammar
* none of them should produce a valid lvalue, so they
* should not produce functioning programs.
*
* GCC has this bug as well, so surprises should be minimal.
*/
def = conditional_expr(state);
left = def;
switch((tok = peek(state))) {
case TOK_EQ:
lvalue(state, left);
eat(state, TOK_EQ);
def = write_expr(state, left,
read_expr(state, assignment_expr(state)));
break;
case TOK_TIMESEQ:
case TOK_DIVEQ:
case TOK_MODEQ:
case TOK_PLUSEQ:
case TOK_MINUSEQ:
lvalue(state, left);
arithmetic(state, left);
eat(state, tok);
right = read_expr(state, assignment_expr(state));
arithmetic(state, right);
sign = is_signed(left->type);
op = -1;
switch(tok) {
case TOK_TIMESEQ: op = sign? OP_SMUL : OP_UMUL; break;
case TOK_DIVEQ: op = sign? OP_SDIV : OP_UDIV; break;
case TOK_MODEQ: op = sign? OP_SMOD : OP_UMOD; break;
case TOK_PLUSEQ: op = OP_ADD; break;
case TOK_MINUSEQ: op = OP_SUB; break;
}
def = write_expr(state, left,
triple(state, op, left->type,
read_expr(state, left), right));
break;
case TOK_SLEQ:
case TOK_SREQ:
case TOK_ANDEQ:
case TOK_XOREQ:
case TOK_OREQ:
lvalue(state, left);
integral(state, left);
eat(state, tok);
right = read_expr(state, assignment_expr(state));
integral(state, right);
right = integral_promotion(state, right);
sign = is_signed(left->type);
op = -1;
switch(tok) {
case TOK_SLEQ: op = OP_SL; break;
case TOK_SREQ: op = sign? OP_SSR: OP_USR; break;
case TOK_ANDEQ: op = OP_AND; break;
case TOK_XOREQ: op = OP_XOR; break;
case TOK_OREQ: op = OP_OR; break;
}
def = write_expr(state, left,
triple(state, op, left->type,
read_expr(state, left), right));
break;
}
return def;
}
static struct triple *expr(struct compile_state *state)
{
struct triple *def;
def = assignment_expr(state);
while(peek(state) == TOK_COMMA) {
struct triple *left, *right;
left = def;
eat(state, TOK_COMMA);
right = assignment_expr(state);
def = triple(state, OP_COMMA, right->type, left, right);
}
return def;
}
static void expr_statement(struct compile_state *state, struct triple *first)
{
if (peek(state) != TOK_SEMI) {
flatten(state, first, expr(state));
}
eat(state, TOK_SEMI);
}
static void if_statement(struct compile_state *state, struct triple *first)
{
struct triple *test, *jmp1, *jmp2, *middle, *end;
jmp1 = jmp2 = middle = 0;
eat(state, TOK_IF);
eat(state, TOK_LPAREN);
test = expr(state);
bool(state, test);
/* Cleanup and invert the test */
test = lfalse_expr(state, read_expr(state, test));
eat(state, TOK_RPAREN);
/* Generate the needed pieces */
middle = label(state);
jmp1 = triple(state, OP_BRANCH, &void_type, middle, test);
/* Thread the pieces together */
flatten(state, first, test);
flatten(state, first, jmp1);
flatten(state, first, label(state));
statement(state, first);
if (peek(state) == TOK_ELSE) {
eat(state, TOK_ELSE);
/* Generate the rest of the pieces */
end = label(state);
jmp2 = triple(state, OP_BRANCH, &void_type, end, 0);
/* Thread them together */
flatten(state, first, jmp2);
flatten(state, first, middle);
statement(state, first);
flatten(state, first, end);
}
else {
flatten(state, first, middle);
}
}
static void for_statement(struct compile_state *state, struct triple *first)
{
struct triple *head, *test, *tail, *jmp1, *jmp2, *end;
struct triple *label1, *label2, *label3;
struct hash_entry *ident;
eat(state, TOK_FOR);
eat(state, TOK_LPAREN);
head = test = tail = jmp1 = jmp2 = 0;
if (peek(state) != TOK_SEMI) {
head = expr(state);
}
eat(state, TOK_SEMI);
if (peek(state) != TOK_SEMI) {
test = expr(state);
bool(state, test);
test = ltrue_expr(state, read_expr(state, test));
}
eat(state, TOK_SEMI);
if (peek(state) != TOK_RPAREN) {
tail = expr(state);
}
eat(state, TOK_RPAREN);
/* Generate the needed pieces */
label1 = label(state);
label2 = label(state);
label3 = label(state);
if (test) {
jmp1 = triple(state, OP_BRANCH, &void_type, label3, 0);
jmp2 = triple(state, OP_BRANCH, &void_type, label1, test);
}
else {
jmp2 = triple(state, OP_BRANCH, &void_type, label1, 0);
}
end = label(state);
/* Remember where break and continue go */
start_scope(state);
ident = state->i_break;
symbol(state, ident, &ident->sym_ident, end, end->type);
ident = state->i_continue;
symbol(state, ident, &ident->sym_ident, label2, label2->type);
/* Now include the body */
flatten(state, first, head);
flatten(state, first, jmp1);
flatten(state, first, label1);
statement(state, first);
flatten(state, first, label2);
flatten(state, first, tail);
flatten(state, first, label3);
flatten(state, first, test);
flatten(state, first, jmp2);
flatten(state, first, end);
/* Cleanup the break/continue scope */
end_scope(state);
}
static void while_statement(struct compile_state *state, struct triple *first)
{
struct triple *label1, *test, *label2, *jmp1, *jmp2, *end;
struct hash_entry *ident;
eat(state, TOK_WHILE);
eat(state, TOK_LPAREN);
test = expr(state);
bool(state, test);
test = ltrue_expr(state, read_expr(state, test));
eat(state, TOK_RPAREN);
/* Generate the needed pieces */
label1 = label(state);
label2 = label(state);
jmp1 = triple(state, OP_BRANCH, &void_type, label2, 0);
jmp2 = triple(state, OP_BRANCH, &void_type, label1, test);
end = label(state);
/* Remember where break and continue go */
start_scope(state);
ident = state->i_break;
symbol(state, ident, &ident->sym_ident, end, end->type);
ident = state->i_continue;
symbol(state, ident, &ident->sym_ident, label2, label2->type);
/* Thread them together */
flatten(state, first, jmp1);
flatten(state, first, label1);
statement(state, first);
flatten(state, first, label2);
flatten(state, first, test);
flatten(state, first, jmp2);
flatten(state, first, end);
/* Cleanup the break/continue scope */
end_scope(state);
}
static void do_statement(struct compile_state *state, struct triple *first)
{
struct triple *label1, *label2, *test, *end;
struct hash_entry *ident;
eat(state, TOK_DO);
/* Generate the needed pieces */
label1 = label(state);
label2 = label(state);
end = label(state);
/* Remember where break and continue go */
start_scope(state);
ident = state->i_break;
symbol(state, ident, &ident->sym_ident, end, end->type);
ident = state->i_continue;
symbol(state, ident, &ident->sym_ident, label2, label2->type);
/* Now include the body */
flatten(state, first, label1);
statement(state, first);
/* Cleanup the break/continue scope */
end_scope(state);
/* Eat the rest of the loop */
eat(state, TOK_WHILE);
eat(state, TOK_LPAREN);
test = read_expr(state, expr(state));
bool(state, test);
eat(state, TOK_RPAREN);
eat(state, TOK_SEMI);
/* Thread the pieces together */
test = ltrue_expr(state, test);
flatten(state, first, label2);
flatten(state, first, test);
flatten(state, first,
triple(state, OP_BRANCH, &void_type, label1, test));
flatten(state, first, end);
}
static void return_statement(struct compile_state *state, struct triple *first)
{
struct triple *jmp, *mv, *dest, *var, *val;
int last;
eat(state, TOK_RETURN);
#warning "FIXME implement a more general excess branch elimination"
val = 0;
/* If we have a return value do some more work */
if (peek(state) != TOK_SEMI) {
val = read_expr(state, expr(state));
}
eat(state, TOK_SEMI);
/* See if this last statement in a function */
last = ((peek(state) == TOK_RBRACE) &&
(state->scope_depth == GLOBAL_SCOPE_DEPTH +2));
/* Find the return variable */
var = state->main_function->right;
/* Find the return destination */
dest = state->main_function->left->prev;
mv = jmp = 0;
/* If needed generate a jump instruction */
if (!last) {
jmp = triple(state, OP_BRANCH, &void_type, dest, 0);
}
/* If needed generate an assignment instruction */
if (val) {
mv = write_expr(state, var, val);
}
/* Now put the code together */
if (mv) {
flatten(state, first, mv);
flatten(state, first, jmp);
}
else if (jmp) {
flatten(state, first, jmp);
}
}
static void break_statement(struct compile_state *state, struct triple *first)
{
struct triple *dest;
eat(state, TOK_BREAK);
eat(state, TOK_SEMI);
if (!state->i_break->sym_ident) {
error(state, 0, "break statement not within loop or switch");
}
dest = state->i_break->sym_ident->def;
flatten(state, first, triple(state, OP_BRANCH, &void_type, dest, 0));
}
static void continue_statement(struct compile_state *state, struct triple *first)
{
struct triple *dest;
eat(state, TOK_CONTINUE);
eat(state, TOK_SEMI);
if (!state->i_continue->sym_ident) {
error(state, 0, "continue statement outside of a loop");
}
dest = state->i_continue->sym_ident->def;
flatten(state, first, triple(state, OP_BRANCH, &void_type, dest, 0));
}
static void goto_statement(struct compile_state *state, struct triple *first)
{
FINISHME();
eat(state, TOK_GOTO);
eat(state, TOK_IDENT);
eat(state, TOK_SEMI);
error(state, 0, "goto is not implemeted");
FINISHME();
}
static void labeled_statement(struct compile_state *state, struct triple *first)
{
FINISHME();
eat(state, TOK_IDENT);
eat(state, TOK_COLON);
statement(state, first);
error(state, 0, "labeled statements are not implemented");
FINISHME();
}
static void switch_statement(struct compile_state *state, struct triple *first)
{
FINISHME();
eat(state, TOK_SWITCH);
eat(state, TOK_LPAREN);
expr(state);
eat(state, TOK_RPAREN);
statement(state, first);
error(state, 0, "switch statements are not implemented");
FINISHME();
}
static void case_statement(struct compile_state *state, struct triple *first)
{
FINISHME();
eat(state, TOK_CASE);
constant_expr(state);
eat(state, TOK_COLON);
statement(state, first);
error(state, 0, "case statements are not implemented");
FINISHME();
}
static void default_statement(struct compile_state *state, struct triple *first)
{
FINISHME();
eat(state, TOK_DEFAULT);
eat(state, TOK_COLON);
statement(state, first);
error(state, 0, "default statements are not implemented");
FINISHME();
}
static void asm_statement(struct compile_state *state, struct triple *first)
{
FINISHME();
error(state, 0, "FIXME finish asm_statement");
}
static int isdecl(int tok)
{
switch(tok) {
case TOK_AUTO:
case TOK_REGISTER:
case TOK_STATIC:
case TOK_EXTERN:
case TOK_TYPEDEF:
case TOK_CONST:
case TOK_RESTRICT:
case TOK_VOLATILE:
case TOK_VOID:
case TOK_CHAR:
case TOK_SHORT:
case TOK_INT:
case TOK_LONG:
case TOK_FLOAT:
case TOK_DOUBLE:
case TOK_SIGNED:
case TOK_UNSIGNED:
case TOK_STRUCT:
case TOK_UNION:
case TOK_ENUM:
case TOK_TYPE_NAME: /* typedef name */
return 1;
default:
return 0;
}
}
static void compound_statement(struct compile_state *state, struct triple *first)
{
eat(state, TOK_LBRACE);
start_scope(state);
/* statement-list opt */
while (peek(state) != TOK_RBRACE) {
statement(state, first);
}
end_scope(state);
eat(state, TOK_RBRACE);
}
static void statement(struct compile_state *state, struct triple *first)
{
int tok;
tok = peek(state);
if (tok == TOK_LBRACE) {
compound_statement(state, first);
}
else if (tok == TOK_IF) {
if_statement(state, first);
}
else if (tok == TOK_FOR) {
for_statement(state, first);
}
else if (tok == TOK_WHILE) {
while_statement(state, first);
}
else if (tok == TOK_DO) {
do_statement(state, first);
}
else if (tok == TOK_RETURN) {
return_statement(state, first);
}
else if (tok == TOK_BREAK) {
break_statement(state, first);
}
else if (tok == TOK_CONTINUE) {
continue_statement(state, first);
}
else if (tok == TOK_GOTO) {
goto_statement(state, first);
}
else if (tok == TOK_SWITCH) {
switch_statement(state, first);
}
else if (tok == TOK_ASM) {
asm_statement(state, first);
}
else if ((tok == TOK_IDENT) && (peek2(state) == TOK_COLON)) {
labeled_statement(state, first);
}
else if (tok == TOK_CASE) {
case_statement(state, first);
}
else if (tok == TOK_DEFAULT) {
default_statement(state, first);
}
else if (isdecl(tok)) {
/* This handles C99 intermixing of statements and decls */
decl(state, first);
}
else {
expr_statement(state, first);
}
}
static struct type *param_decl(struct compile_state *state)
{
struct type *type;
struct hash_entry *ident;
/* Cheat so the declarator will know we are not global */
start_scope(state);
ident = 0;
type = decl_specifiers(state);
type = declarator(state, type, &ident, 0);
type->ident = ident;
end_scope(state);
return type;
}
static struct type *param_type_list(struct compile_state *state, struct type *type)
{
struct type *ftype, **next;
ftype = new_type(TYPE_FUNCTION, type, param_decl(state));
next = &ftype->right;
while(peek(state) == TOK_COMMA) {
eat(state, TOK_COMMA);
if (peek(state) == TOK_DOTS) {
eat(state, TOK_DOTS);
error(state, 0, "variadic functions not supported");
}
else {
*next = new_type(TYPE_PRODUCT, *next, param_decl(state));
next = &((*next)->right);
}
}
return ftype;
}
static struct type *type_name(struct compile_state *state)
{
struct type *type;
type = specifier_qualifier_list(state);
/* abstract-declarator (may consume no tokens) */
type = declarator(state, type, 0, 0);
return type;
}
static struct type *direct_declarator(
struct compile_state *state, struct type *type,
struct hash_entry **ident, int need_ident)
{
struct type *outer;
int op;
outer = 0;
arrays_complete(state, type);
switch(peek(state)) {
case TOK_IDENT:
eat(state, TOK_IDENT);
if (!ident) {
error(state, 0, "Unexpected identifier found");
}
/* The name of what we are declaring */
*ident = state->token[0].ident;
break;
case TOK_LPAREN:
eat(state, TOK_LPAREN);
outer = declarator(state, type, ident, need_ident);
eat(state, TOK_RPAREN);
break;
default:
if (need_ident) {
error(state, 0, "Identifier expected");
}
break;
}
do {
op = 1;
arrays_complete(state, type);
switch(peek(state)) {
case TOK_LPAREN:
eat(state, TOK_LPAREN);
type = param_type_list(state, type);
eat(state, TOK_RPAREN);
break;
case TOK_LBRACKET:
{
unsigned int qualifiers;
struct triple *value;
value = 0;
eat(state, TOK_LBRACKET);
if (peek(state) != TOK_RBRACKET) {
value = constant_expr(state);
integral(state, value);
}
eat(state, TOK_RBRACKET);
qualifiers = type->type & (QUAL_MASK | STOR_MASK);
type = new_type(TYPE_ARRAY | qualifiers, type, 0);
if (value) {
type->elements = value->u.cval;
free_triple(state, value);
} else {
type->elements = ELEMENT_COUNT_UNSPECIFIED;
op = 0;
}
}
break;
default:
op = 0;
break;
}
} while(op);
if (outer) {
struct type *inner;
arrays_complete(state, type);
FINISHME();
for(inner = outer; inner->left; inner = inner->left)
;
inner->left = type;
type = outer;
}
return type;
}
static struct type *declarator(
struct compile_state *state, struct type *type,
struct hash_entry **ident, int need_ident)
{
while(peek(state) == TOK_STAR) {
eat(state, TOK_STAR);
type = new_type(TYPE_POINTER | (type->type & STOR_MASK), type, 0);
}
type = direct_declarator(state, type, ident, need_ident);
return type;
}
static struct type *typedef_name(
struct compile_state *state, unsigned int specifiers)
{
struct hash_entry *ident;
struct type *type;
eat(state, TOK_TYPE_NAME);
ident = state->token[0].ident;
type = ident->sym_ident->type;
specifiers |= type->type & QUAL_MASK;
if ((specifiers & (STOR_MASK | QUAL_MASK)) !=
(type->type & (STOR_MASK | QUAL_MASK))) {
type = clone_type(specifiers, type);
}
FINISHME();
return type;
}
static struct type *enum_specifier(
struct compile_state *state, unsigned int specifiers)
{
int tok;
struct type *type;
type = 0;
FINISHME();
eat(state, TOK_ENUM);
tok = peek(state);
if (tok == TOK_IDENT) {
eat(state, TOK_IDENT);
}
if ((tok != TOK_IDENT) || (peek(state) == TOK_LBRACE)) {
eat(state, TOK_LBRACE);
do {
eat(state, TOK_IDENT);
if (peek(state) == TOK_EQ) {
eat(state, TOK_EQ);
constant_expr(state);
}
if (peek(state) == TOK_COMMA) {
eat(state, TOK_COMMA);
}
} while(peek(state) != TOK_RBRACE);
eat(state, TOK_RBRACE);
}
FINISHME();
return type;
}
#if 0
static struct type *struct_declarator(
struct compile_state *state, struct type *type, struct hash_entry **ident)
{
int tok;
#warning "struct_declarator is complicated because of bitfields, kill them?"
tok = peek(state);
if (tok != TOK_COLON) {
type = declarator(state, type, ident, 1);
}
if ((tok == TOK_COLON) || (peek(state) == TOK_COLON)) {
eat(state, TOK_COLON);
constant_expr(state);
}
FINISHME();
return type;
}
#endif
static struct type *struct_or_union_specifier(
struct compile_state *state, unsigned int specifiers)
{
struct type *type;
int tok;
FINISHME();
type = 0;
switch(peek(state)) {
case TOK_STRUCT:
eat(state, TOK_STRUCT);
break;
case TOK_UNION:
eat(state, TOK_UNION);
break;
default:
eat(state, TOK_STRUCT);
break;
}
tok = peek(state);
if (tok == TOK_IDENT) {
eat(state, TOK_IDENT);
FINISHME();
}
if ((tok != TOK_IDENT) || (peek(state) == TOK_LBRACE)) {
eat(state, TOK_LBRACE);
do {
struct type *base_type;
int done;
FINISHME();
base_type = specifier_qualifier_list(state);
do {
struct type *type;
struct hash_entry *ident;
done = 1;
type = declarator(state, base_type, &ident, 1);
if (peek(state) == TOK_COMMA) {
done = 0;
eat(state, TOK_COMMA);
}
} while(!done);
eat(state, TOK_SEMI);
} while(peek(state) != TOK_RBRACE);
eat(state, TOK_RBRACE);
}
FINISHME();
return type;
}
static unsigned int storage_class_specifier_opt(struct compile_state *state)
{
unsigned int specifiers;
switch(peek(state)) {
case TOK_AUTO:
eat(state, TOK_AUTO);
specifiers = STOR_AUTO;
break;
case TOK_REGISTER:
eat(state, TOK_REGISTER);
specifiers = STOR_REGISTER;
break;
case TOK_STATIC:
eat(state, TOK_STATIC);
specifiers = STOR_STATIC;
break;
case TOK_EXTERN:
eat(state, TOK_EXTERN);
specifiers = STOR_EXTERN;
break;
case TOK_TYPEDEF:
eat(state, TOK_TYPEDEF);
specifiers = STOR_TYPEDEF;
break;
default:
if (state->scope_depth <= GLOBAL_SCOPE_DEPTH) {
specifiers = STOR_STATIC;
}
else {
specifiers = STOR_AUTO;
}
}
return specifiers;
}
static unsigned int function_specifier_opt(struct compile_state *state)
{
/* Ignore the inline keyword */
unsigned int specifiers;
specifiers = 0;
switch(peek(state)) {
case TOK_INLINE:
eat(state, TOK_INLINE);
specifiers = STOR_INLINE;
}
return specifiers;
}
static unsigned int type_qualifiers(struct compile_state *state)
{
unsigned int specifiers;
int done;
done = 0;
specifiers = QUAL_NONE;
do {
switch(peek(state)) {
case TOK_CONST:
eat(state, TOK_CONST);
specifiers = QUAL_CONST;
break;
case TOK_VOLATILE:
eat(state, TOK_VOLATILE);
specifiers = QUAL_VOLATILE;
break;
case TOK_RESTRICT:
eat(state, TOK_RESTRICT);
specifiers = QUAL_RESTRICT;
break;
default:
done = 1;
break;
}
} while(!done);
return specifiers;
}
static struct type *type_specifier(
struct compile_state *state, unsigned int spec)
{
struct type *type;
type = 0;
switch(peek(state)) {
case TOK_VOID:
eat(state, TOK_VOID);
type = new_type(TYPE_VOID | spec, 0, 0);
break;
case TOK_CHAR:
eat(state, TOK_CHAR);
type = new_type(TYPE_CHAR | spec, 0, 0);
break;
case TOK_SHORT:
eat(state, TOK_SHORT);
if (peek(state) == TOK_INT) {
eat(state, TOK_INT);
}
type = new_type(TYPE_SHORT | spec, 0, 0);
break;
case TOK_INT:
eat(state, TOK_INT);
type = new_type(TYPE_INT | spec, 0, 0);
break;
case TOK_LONG:
eat(state, TOK_LONG);
switch(peek(state)) {
case TOK_LONG:
eat(state, TOK_LONG);
error(state, 0, "long long not supported");
break;
case TOK_DOUBLE:
eat(state, TOK_DOUBLE);
error(state, 0, "long double not supported");
break;
case TOK_INT:
eat(state, TOK_INT);
type = new_type(TYPE_LONG | spec, 0, 0);
break;
default:
type = new_type(TYPE_LONG | spec, 0, 0);
break;
}
break;
case TOK_FLOAT:
eat(state, TOK_FLOAT);
error(state, 0, "type float not supported");
break;
case TOK_DOUBLE:
eat(state, TOK_DOUBLE);
error(state, 0, "type double not supported");
break;
case TOK_SIGNED:
eat(state, TOK_SIGNED);
switch(peek(state)) {
case TOK_LONG:
eat(state, TOK_LONG);
switch(peek(state)) {
case TOK_LONG:
eat(state, TOK_LONG);
error(state, 0, "type long long not supported");
break;
case TOK_INT:
eat(state, TOK_INT);
type = new_type(TYPE_LONG | spec, 0, 0);
break;
default:
type = new_type(TYPE_LONG | spec, 0, 0);
break;
}
break;
case TOK_INT:
eat(state, TOK_INT);
type = new_type(TYPE_INT | spec, 0, 0);
break;
case TOK_SHORT:
eat(state, TOK_SHORT);
type = new_type(TYPE_SHORT | spec, 0, 0);
break;
case TOK_CHAR:
eat(state, TOK_CHAR);
type = new_type(TYPE_CHAR | spec, 0, 0);
break;
default:
type = new_type(TYPE_INT | spec, 0, 0);
break;
}
break;
case TOK_UNSIGNED:
eat(state, TOK_UNSIGNED);
switch(peek(state)) {
case TOK_LONG:
eat(state, TOK_LONG);
switch(peek(state)) {
case TOK_LONG:
eat(state, TOK_LONG);
error(state, 0, "unsigned long long not supported");
break;
case TOK_INT:
eat(state, TOK_INT);
type = new_type(TYPE_ULONG | spec, 0, 0);
break;
default:
type = new_type(TYPE_ULONG | spec, 0, 0);
break;
}
break;
case TOK_INT:
eat(state, TOK_INT);
type = new_type(TYPE_UINT | spec, 0, 0);
break;
case TOK_SHORT:
eat(state, TOK_SHORT);
type = new_type(TYPE_USHORT | spec, 0, 0);
break;
case TOK_CHAR:
eat(state, TOK_CHAR);
type = new_type(TYPE_UCHAR | spec, 0, 0);
break;
default:
type = new_type(TYPE_UINT | spec, 0, 0);
break;
}
break;
/* struct or union specifier */
case TOK_STRUCT:
case TOK_UNION:
type = struct_or_union_specifier(state, spec);
break;
/* enum-spefifier */
case TOK_ENUM:
type = enum_specifier(state, spec);
break;
/* typedef name */
case TOK_TYPE_NAME:
type = typedef_name(state, spec);
break;
default:
error(state, 0, "bad type specifier %s",
tokens[peek(state)]);
break;
}
return type;
}
static int istype(int tok)
{
switch(tok) {
case TOK_CONST:
case TOK_RESTRICT:
case TOK_VOLATILE:
case TOK_VOID:
case TOK_CHAR:
case TOK_SHORT:
case TOK_INT:
case TOK_LONG:
case TOK_FLOAT:
case TOK_DOUBLE:
case TOK_SIGNED:
case TOK_UNSIGNED:
case TOK_STRUCT:
case TOK_UNION:
case TOK_ENUM:
case TOK_TYPE_NAME:
return 1;
default:
return 0;
}
}
static struct type *specifier_qualifier_list(struct compile_state *state)
{
struct type *type;
unsigned int specifiers = 0;
/* type qualifiers */
specifiers |= type_qualifiers(state);
/* type specifier */
type = type_specifier(state, specifiers);
return type;
}
static int isdecl_specifier(int tok)
{
switch(tok) {
/* storage class specifier */
case TOK_AUTO:
case TOK_REGISTER:
case TOK_STATIC:
case TOK_EXTERN:
case TOK_TYPEDEF:
/* type qualifier */
case TOK_CONST:
case TOK_RESTRICT:
case TOK_VOLATILE:
/* type specifiers */
case TOK_VOID:
case TOK_CHAR:
case TOK_SHORT:
case TOK_INT:
case TOK_LONG:
case TOK_FLOAT:
case TOK_DOUBLE:
case TOK_SIGNED:
case TOK_UNSIGNED:
/* struct or union specifier */
case TOK_STRUCT:
case TOK_UNION:
/* enum-spefifier */
case TOK_ENUM:
/* typedef name */
case TOK_TYPE_NAME:
/* function specifiers */
case TOK_INLINE:
return 1;
default:
return 0;
}
}
static struct type *decl_specifiers(struct compile_state *state)
{
struct type *type;
unsigned int specifiers;
/* I am overly restrictive in the arragement of specifiers supported.
* C is overly flexible in this department it makes interpreting
* the parse tree difficult.
*/
specifiers = 0;
/* storage class specifier */
specifiers |= storage_class_specifier_opt(state);
/* function-specifier */
specifiers |= function_specifier_opt(state);
/* type qualifier */
specifiers |= type_qualifiers(state);
/* type specifier */
type = type_specifier(state, specifiers);
return type;
}
static unsigned designator(struct compile_state *state)
{
int tok;
unsigned index;
index = -1U;
do {
switch(peek(state)) {
case TOK_LBRACKET:
{
struct triple *value;
eat(state, TOK_LBRACKET);
value = constant_expr(state);
eat(state, TOK_RBRACKET);
index = value->u.cval;
break;
}
case TOK_DOT:
eat(state, TOK_DOT);
eat(state, TOK_IDENT);
error(state, 0, "Struct Designators not currently supported");
break;
default:
error(state, 0, "Invalid designator");
}
tok = peek(state);
} while((tok == TOK_LBRACKET) || (tok == TOK_DOT));
eat(state, TOK_EQ);
return index;
}
static struct triple *initializer(
struct compile_state *state, struct type *type)
{
struct triple *result;
if (peek(state) != TOK_LBRACE) {
result = assignment_expr(state);
}
else {
int comma;
unsigned index, max_index;
void *buf;
max_index = index = 0;
if ((type->type & TYPE_MASK) == TYPE_ARRAY) {
max_index = type->elements;
if (type->elements == ELEMENT_COUNT_UNSPECIFIED) {
type->elements = 0;
}
} else {
error(state, 0, "Struct initializers not currently supported");
}
buf = xcmalloc(size_of(state, type), "initializer");
eat(state, TOK_LBRACE);
do {
struct triple *value;
struct type *value_type;
size_t value_size;
int tok;
comma = 0;
tok = peek(state);
if ((tok == TOK_LBRACKET) || (tok == TOK_DOT)) {
index = designator(state);
}
if ((max_index != ELEMENT_COUNT_UNSPECIFIED) &&
(index > max_index)) {
error(state, 0, "element beyond bounds");
}
value_type = 0;
if ((type->type & TYPE_MASK) == TYPE_ARRAY) {
value_type = type->left;
}
value = eval_const_expr(state, initializer(state, value_type));
value_size = size_of(state, value_type);
if (((type->type & TYPE_MASK) == TYPE_ARRAY) &&
(max_index == ELEMENT_COUNT_UNSPECIFIED) &&
(type->elements <= index)) {
void *old_buf;
size_t old_size;
old_buf = buf;
old_size = size_of(state, type);
type->elements = index + 1;
buf = xmalloc(size_of(state, type), "initializer");
memcpy(buf, old_buf, old_size);
xfree(old_buf);
}
if (value->op == OP_BLOBCONST) {
memcpy((char *)buf + index * value_size, value->u.blob, value_size);
}
else if ((value->op == OP_INTCONST) && (value_size == 1)) {
*(((uint8_t *)buf) + index) = value->u.cval & 0xff;
}
else if ((value->op == OP_INTCONST) && (value_size == 2)) {
*(((uint16_t *)buf) + index) = value->u.cval & 0xffff;
}
else if ((value->op == OP_INTCONST) && (value_size == 4)) {
*(((uint32_t *)buf) + index) = value->u.cval & 0xffffffff;
}
else {
fprintf(stderr, "%d %d\n",
value->op, value_size);
internal_error(state, 0, "unhandled constant initializer");
}
if (peek(state) == TOK_COMMA) {
eat(state, TOK_COMMA);
comma = 1;
}
index += 1;
} while(comma && (peek(state) != TOK_RBRACE));
eat(state, TOK_RBRACE);
result = triple(state, OP_BLOBCONST, type, 0, 0);
result->u.blob = buf;
}
return result;
}
static struct triple *function_definition(
struct compile_state *state, struct type *type)
{
struct triple *def, *tmp, *first, *end;
struct hash_entry *ident;
struct type *param;
int i;
if ((type->type &TYPE_MASK) != TYPE_FUNCTION) {
error(state, 0, "Invalid function header");
}
/* Verify the function type */
if (((type->right->type & TYPE_MASK) != TYPE_VOID) &&
((type->right->type & TYPE_MASK) != TYPE_PRODUCT) &&
(type->right->ident == 0)) {
error(state, 0, "Invalid function parameters");
}
param = type->right;
i = 0;
while((param->type & TYPE_MASK) == TYPE_PRODUCT) {
i++;
if (!param->left->ident) {
error(state, 0, "No identifier for parameter %d\n", i);
}
param = param->right;
}
i++;
if (((param->type & TYPE_MASK) != TYPE_VOID) && !param->ident) {
error(state, 0, "No identifier for paramter %d\n", i);
}
/* Get a list of statements for this function. */
def = triple(state, OP_LIST, type, 0, 0);
/* Start a new scope for the passed parameters */
start_scope(state);
/* Put a label at the very start of a function */
first = label(state);
def->left = first;
/* Put a label at the very end of a function */
end = label(state);
flatten(state, first, end);
/* Walk through the parameters and create symbol table entries
* for them.
*/
param = type->right;
while((param->type & TYPE_MASK) == TYPE_PRODUCT) {
ident = param->left->ident;
tmp = variable(state, param->left);
symbol(state, ident, &ident->sym_ident, tmp, tmp->type);
flatten(state, end, tmp);
param = param->right;
}
if ((param->type & TYPE_MASK) != TYPE_VOID) {
/* And don't forget the last parameter */
ident = param->ident;
tmp = variable(state, param);
symbol(state, ident, &ident->sym_ident, tmp, tmp->type);
flatten(state, end, tmp);
}
/* Add a variable for the return value */
def->right = 0;
if ((type->left->type & TYPE_MASK) != TYPE_VOID) {
/* Remove all type qualifiers from the return type */
tmp = variable(state, clone_type(0, type->left));
flatten(state, end, tmp);
/* Remember where the return value is */
def->right = tmp;
}
/* Remember which function I am compiling.
* Also assume the last defined function is the main function.
*/
state->main_function = def;
/* Now get the actual function definition */
compound_statement(state, end);
/* Remove the parameter scope */
end_scope(state);
#if 0
fprintf(stdout, "\n");
loc(stdout, state, 0);
fprintf(stdout, "\n__________ function_definition _________\n");
print_triple(state, def);
fprintf(stdout, "__________ function_definition _________ done\n\n");
#endif
return def;
}
static struct triple *do_decl(struct compile_state *state,
struct type *type, struct hash_entry *ident)
{
struct triple *def;
def = 0;
/* Clean up the storage types used */
switch (type->type & STOR_MASK) {
case STOR_AUTO:
case STOR_STATIC:
/* These are the good types I am aiming for */
break;
case STOR_REGISTER:
type->type &= ~STOR_MASK;
type->type |= STOR_AUTO;
break;
case STOR_EXTERN:
type->type &= ~STOR_MASK;
type->type |= STOR_STATIC;
break;
case STOR_TYPEDEF:
#warning "FIXME support typedefs"
error(state, 0, "typedefs not currently supported");
break;
default:
internal_error(state, 0, "Undefined storage class");
}
if (((type->type & STOR_MASK) == STOR_STATIC) &&
((type->type & QUAL_CONST) == 0)) {
error(state, 0, "non const static variables not supported");
}
if (ident) {
def = variable(state, type);
symbol(state, ident, &ident->sym_ident, def, type);
}
return def;
}
static void decl(struct compile_state *state, struct triple *first)
{
struct type *base_type, *type;
struct hash_entry *ident;
struct triple *def;
int global;
global = (state->scope_depth <= GLOBAL_SCOPE_DEPTH);
base_type = decl_specifiers(state);
ident = 0;
type = declarator(state, base_type, &ident, 0);
if (global && ident && (peek(state) == TOK_LBRACE)) {
/* function */
def = function_definition(state, type);
symbol(state, ident, &ident->sym_ident, def, type);
}
else {
int done;
flatten(state, first, do_decl(state, type, ident));
/* type or variable definition */
do {
done = 1;
if (peek(state) == TOK_EQ) {
if (!ident) {
error(state, 0, "cannot assign to a type");
}
eat(state, TOK_EQ);
flatten(state, first,
init_expr(state,
ident->sym_ident->def,
initializer(state, type)));
}
arrays_complete(state, type);
if (peek(state) == TOK_COMMA) {
eat(state, TOK_COMMA);
ident = 0;
type = declarator(state, base_type, &ident, 0);
flatten(state, first, do_decl(state, type, ident));
done = 0;
}
} while(!done);
eat(state, TOK_SEMI);
}
}
static void decls(struct compile_state *state)
{
struct triple *list;
int tok;
list = label(state);
while(1) {
tok = peek(state);
if (tok == TOK_EOF) {
return;
}
if (tok == TOK_SPACE) {
eat(state, TOK_SPACE);
}
decl(state, list);
if (list->next != list) {
error(state, 0, "global variables not supported");
}
}
}
/*
* Data structurs for optimation.
*/
static void do_use_block(
struct block *used, struct block_set **head, struct block *user,
int front)
{
struct block_set **ptr, *new;
if (!used)
return;
if (!user)
return;
ptr = head;
while(*ptr) {
if ((*ptr)->member == user) {
return;
}
ptr = &(*ptr)->next;
}
new = xcmalloc(sizeof(*new), "block_set");
new->member = user;
if (front) {
new->next = *head;
*head = new;
}
else {
new->next = 0;
*ptr = new;
}
}
static void do_unuse_block(
struct block *used, struct block_set **head, struct block *unuser)
{
struct block_set *use, **ptr;
ptr = head;
while(*ptr) {
use = *ptr;
if (use->member == unuser) {
*ptr = use->next;
memset(use, -1, sizeof(*use));
xfree(use);
}
else {
ptr = &use->next;
}
}
}
static void use_block(struct block *used, struct block *user)
{
/* Append new to the head of the list, print_block
* depends on this.
*/
do_use_block(used, &used->use, user, 1);
used->users++;
}
static void unuse_block(struct block *used, struct block *unuser)
{
do_unuse_block(used, &used->use, unuser);
used->users--;
}
static void idom_block(struct block *idom, struct block *user)
{
do_use_block(idom, &idom->idominates, user, 0);
}
static void unidom_block(struct block *idom, struct block *unuser)
{
do_unuse_block(idom, &idom->idominates, unuser);
}
static void domf_block(struct block *block, struct block *domf)
{
do_use_block(block, &block->domfrontier, domf, 0);
}
static void undomf_block(struct block *block, struct block *undomf)
{
do_unuse_block(block, &block->domfrontier, undomf);
}
static void ipdom_block(struct block *ipdom, struct block *user)
{
do_use_block(ipdom, &ipdom->ipdominates, user, 0);
}
static void unipdom_block(struct block *ipdom, struct block *unuser)
{
do_unuse_block(ipdom, &ipdom->ipdominates, unuser);
}
static void ipdomf_block(struct block *block, struct block *ipdomf)
{
do_use_block(block, &block->ipdomfrontier, ipdomf, 0);
}
static void unipdomf_block(struct block *block, struct block *unipdomf)
{
do_unuse_block(block, &block->ipdomfrontier, unipdomf);
}
static int do_walk_triple(struct compile_state *state,
struct triple *ptr, int depth,
int (*cb)(struct compile_state *state, struct triple *ptr, int depth))
{
int result;
result = cb(state, ptr, depth);
if ((result == 0) && (ptr->op == OP_LIST)) {
struct triple *list;
list = ptr;
ptr = list->left;
do {
result = do_walk_triple(state, ptr, depth + 1, cb);
if (ptr->next->prev != ptr) {
internal_error(state, ptr->next, "bad prev");
}
ptr = ptr->next;
} while((result == 0) && (ptr != list->left));
}
return result;
}
static int walk_triple(
struct compile_state *state,
struct triple *ptr,
int (*cb)(struct compile_state *state, struct triple *ptr, int depth))
{
return do_walk_triple(state, ptr, 0, cb);
}
static void do_print_prefix(int depth)
{
int i;
for(i = 0; i < depth; i++) {
printf(" ");
}
}
#define PRINT_LIST 1
static int do_print_triple(struct compile_state *state, struct triple *ins, int depth)
{
int op;
op = ins->op;
if (op == OP_LIST) {
#if !PRINT_LIST
return 0;
#endif
}
else if ((op == OP_LABEL) && (ins->use)) {
printf("\n%p:\n", ins);
}
else if (op == OP_INTCONST) {
do_print_prefix(depth);
printf("(%p) %-7s %08lx @ %s:%d.%d\n",
ins, tops(ins->op), ins->u.cval,
ins->filename, ins->line, ins->col);
return 0;
}
else if (op == OP_SDECL) {
do_print_prefix(depth);
printf("(%p) %-7s %-10p @ %s:%d.%d\n",
ins, tops(ins->op), ins->left,
ins->filename, ins->line, ins->col);
do_print_triple(state, ins->left, depth + 1);
}
do_print_prefix(depth);
printf("%s(%p) %-7s %-10p %-10p @ %s:%d.%d\n",
(op == OP_LIST)? "list: ": "",
ins, tops(ins->op), ins->left, ins->right,
ins->filename, ins->line, ins->col);
if ((ins->op == OP_BRANCH) && ins->use) {
internal_error(state, ins, "branch used?");
}
#if 0
{
struct triple_set *user;
for(user = ins->use; user; user = user->next) {
printf("use: %p\n", user->member);
}
}
#endif
if (triple_is_branch(ins)) {
printf("\n");
}
return 0;
}
static void print_triple(struct compile_state *state, struct triple *ins)
{
walk_triple(state, ins, do_print_triple);
}
static void print_triples(struct compile_state *state)
{
print_triple(state, state->main_function);
}
struct cf_block {
struct block *block;
};
static void find_cf_blocks(struct cf_block *cf, struct block *block)
{
if (!block || (cf[block->vertex].block == block)) {
return;
}
cf[block->vertex].block = block;
find_cf_blocks(cf, block->left);
find_cf_blocks(cf, block->right);
}
static void print_control_flow(struct compile_state *state)
{
struct cf_block *cf;
int i;
printf("\ncontrol flow\n");
cf = xcmalloc(sizeof(*cf) * (state->last_vertex + 1), "cf_block");
find_cf_blocks(cf, state->first_block);
for(i = 1; i <= state->last_vertex; i++) {
struct block *block;
block = cf[i].block;
if (!block)
continue;
printf("(%p) %d:", block, block->vertex);
if (block->left) {
printf(" %d", block->left->vertex);
}
if (block->right && (block->right != block->left)) {
printf(" %d", block->right->vertex);
}
printf("\n");
}
xfree(cf);
}
static struct block *basic_block(struct compile_state *state,
struct triple *first)
{
struct block *block;
struct triple *ptr;
int op;
if (first->op != OP_LABEL) {
internal_error(state, 0, "block does not start with a label");
}
/* See if this basic block has already been setup */
if (first->u.block != 0) {
return first->u.block;
}
/* Allocate another basic block structure */
state->last_vertex += 1;
block = xcmalloc(sizeof(*block), "block");
block->first = block->last = first;
block->vertex = state->last_vertex;
ptr = first;
do {
if ((ptr != first) && (ptr->op == OP_LABEL) && ptr->use) {
break;
}
block->last = ptr;
/* If ptr->u is not used remember where the baic block is */
if (!is_const(ptr)) {
ptr->u.block = block;
}
if (ptr->op == OP_BRANCH) {
break;
}
ptr = ptr->next;
} while (ptr != state->main_function->left);
if (ptr == state->main_function->left)
return block;
op = ptr->op;
if (op == OP_LABEL) {
block->left = basic_block(state, ptr);
block->right = 0;
use_block(block->left, block);
}
else if (op == OP_BRANCH) {
block->left = 0;
/* Trace the branch target */
block->right = basic_block(state, ptr->left);
use_block(block->right, block);
/* If there is a test trace the branch as well */
if (ptr->right) {
block->left = basic_block(state, ptr->next);
use_block(block->left, block);
}
}
else {
internal_error(state, 0, "Bad basic block split");
}
return block;
}
static void walk_blocks(struct compile_state *state,
void (*cb)(struct compile_state *state, struct block *block, void *arg),
void *arg)
{
struct triple *ptr, *first;
struct block *last_block;
last_block = 0;
first = state->main_function->left;
ptr = first;
do {
struct block *block;
if (ptr->op == OP_LABEL) {
block = ptr->u.block;
if (block && (block != last_block)) {
cb(state, block, arg);
}
last_block = block;
}
ptr = ptr->next;
} while(ptr != first);
}
static void print_block(
struct compile_state *state, struct block *block, void *arg)
{
struct triple *ptr;
printf("\nblock: %p (%d), %p<-%p %p<-%p\n",
block,
block->vertex,
block->left,
block->left && block->left->use?block->left->use->member : 0,
block->right,
block->right && block->right->use?block->right->use->member : 0);
if (block->first->op == OP_LABEL) {
printf("%p:\n", block->first);
}
for(ptr = block->first; ; ptr = ptr->next) {
struct triple_set *user;
int op = ptr->op;
if (!IS_CONST_OP(op)) {
if (ptr->u.block != block) {
internal_error(state, ptr,
"Wrong block pointer: %p\n",
ptr->u.block);
}
}
if (op == OP_ADECL) {
for(user = ptr->use; user; user = user->next) {
if (!user->member->u.block) {
internal_error(state, user->member,
"Use %p not in a block?\n",
user->member);
}
}
}
if (op == OP_INTCONST) {
printf("(%p) %3d %-7s %08lx @ %s:%d.%d\n",
ptr, ID_REG(ptr->id), tops(ptr->op),
ptr->u.cval,
ptr->filename, ptr->line, ptr->col);
}
else if (op == OP_PHI) {
struct triple **slot;
struct block *block;
int edge;
block = ptr->u.block;
slot = (struct triple **)(ptr->left);
printf("(%p) %3d %-7s",
ptr, ID_REG(ptr->id), tops(ptr->op));
for(edge = 0; edge < block->users; edge++) {
printf(" %-10p", slot[edge]);
}
printf(" @%s:%d.%d\n",
ptr->filename, ptr->line, ptr->col);
}
else {
printf("(%p) %3d %-7s %-10p %-10p @ %s:%d.%d\n",
ptr, ID_REG(ptr->id), tops(ptr->op),
ptr->left, ptr->right,
ptr->filename, ptr->line, ptr->col);
}
/* Sanity checks... */
valid_op(state, ptr);
for(user = ptr->use; user; user = user->next) {
struct triple *use;
use = user->member;
valid_op(state, use);
if (!IS_CONST_OP(user->member->op) &&
!user->member->u.block) {
internal_error(state, user->member,
"Use %p not in a block?",
user->member);
}
}
if (ptr == block->last)
break;
}
printf("\n");
}
static void print_blocks(struct compile_state *state)
{
printf("--------------- blocks ---------------\n");
walk_blocks(state, print_block, 0);
}
static void prune_nonblock_triples(struct compile_state *state)
{
struct block *block;
struct triple *first, *ins;
/* Delete the triples not in a basic block */
first = state->main_function->left;
block = 0;
ins = first;
do {
if (ins->op == OP_LABEL) {
block = ins->u.block;
}
ins = ins->next;
if (!block) {
release_triple(state, ins->prev);
}
} while(ins != first);
}
static void setup_basic_blocks(struct compile_state *state)
{
/* Find the basic blocks */
state->last_vertex = 0;
state->first_block = basic_block(state, state->main_function->left);
/* Delete the triples not in a basic block */
prune_nonblock_triples(state);
/* Find the last basic block */
state->last_block = state->main_function->left->prev->u.block;
if (!state->last_block) {
internal_error(state, 0, "end not used?");
}
/* Insert an extra unused edge from start to the end
* This helps with reverse control flow calculations.
*/
use_block(state->first_block, state->last_block);
/* If we are debugging print what I have just done */
if (state->debug & DEBUG_BASIC_BLOCKS) {
print_blocks(state);
print_control_flow(state);
}
}
static void free_basic_block(struct compile_state *state, struct block *block)
{
struct block_set *entry, *next;
struct block *child;
if (!block) {
return;
}
if (block->vertex == -1) {
return;
}
block->vertex = -1;
if (block->left) {
unuse_block(block->left, block);
}
if (block->right) {
unuse_block(block->right, block);
}
if (block->idom) {
unidom_block(block->idom, block);
}
block->idom = 0;
if (block->ipdom) {
unipdom_block(block->ipdom, block);
}
block->ipdom = 0;
for(entry = block->use; entry; entry = next) {
next = entry->next;
child = entry->member;
unuse_block(block, child);
if (child->left == block) {
child->left = 0;
}
if (child->right == block) {
child->right = 0;
}
}
for(entry = block->idominates; entry; entry = next) {
next = entry->next;
child = entry->member;
unidom_block(block, child);
child->idom = 0;
}
for(entry = block->domfrontier; entry; entry = next) {
next = entry->next;
child = entry->member;
undomf_block(block, child);
}
for(entry = block->ipdominates; entry; entry = next) {
next = entry->next;
child = entry->member;
unipdom_block(block, child);
child->ipdom = 0;
}
for(entry = block->ipdomfrontier; entry; entry = next) {
next = entry->next;
child = entry->member;
unipdomf_block(block, child);
}
if (block->users != 0) {
internal_error(state, 0, "block still has users");
}
free_basic_block(state, block->left);
block->left = 0;
free_basic_block(state, block->right);
block->right = 0;
memset(block, -1, sizeof(*block));
xfree(block);
}
static void free_basic_blocks(struct compile_state *state)
{
struct triple *first, *ins;
free_basic_block(state, state->first_block);
state->last_vertex = 0;
state->first_block = state->last_block = 0;
first = state->main_function->left;
ins = first;
do {
if (!is_const(ins)) {
ins->u.block = 0;
}
ins = ins->next;
} while(ins != first);
}
struct sdom_block {
struct block *block;
struct sdom_block *sdominates;
struct sdom_block *sdom_next;
struct sdom_block *sdom;
struct sdom_block *label;
struct sdom_block *parent;
struct sdom_block *ancestor;
int vertex;
};
static void unsdom_block(struct sdom_block *block)
{
struct sdom_block **ptr;
if (!block->sdom_next) {
return;
}
ptr = &block->sdom->sdominates;
while(*ptr) {
if ((*ptr) == block) {
*ptr = block->sdom_next;
return;
}
ptr = &(*ptr)->sdom_next;
}
}
static void sdom_block(struct sdom_block *sdom, struct sdom_block *block)
{
unsdom_block(block);
block->sdom = sdom;
block->sdom_next = sdom->sdominates;
sdom->sdominates = block;
}
static int initialize_sdblock(struct sdom_block *sd,
struct block *parent, struct block *block, int vertex)
{
if (!block || (sd[block->vertex].block == block)) {
return vertex;
}
vertex += 1;
/* Renumber the blocks in a convinient fashion */
block->vertex = vertex;
sd[vertex].block = block;
sd[vertex].sdom = &sd[vertex];
sd[vertex].label = &sd[vertex];
sd[vertex].parent = parent? &sd[parent->vertex] : 0;
sd[vertex].ancestor = 0;
sd[vertex].vertex = vertex;
vertex = initialize_sdblock(sd, block, block->left, vertex);
vertex = initialize_sdblock(sd, block, block->right, vertex);
return vertex;
}
static int initialize_sdpblock(struct sdom_block *sd,
struct block *parent, struct block *block, int vertex)
{
struct block_set *user;
if (!block || (sd[block->vertex].block == block)) {
return vertex;
}
vertex += 1;
/* Renumber the blocks in a convinient fashion */
block->vertex = vertex;
sd[vertex].block = block;
sd[vertex].sdom = &sd[vertex];
sd[vertex].label = &sd[vertex];
sd[vertex].parent = parent? &sd[parent->vertex] : 0;
sd[vertex].ancestor = 0;
sd[vertex].vertex = vertex;
for(user = block->use; user; user = user->next) {
vertex = initialize_sdpblock(sd, block, user->member, vertex);
}
return vertex;
}
static void compress_ancestors(struct sdom_block *v)
{
/* This procedure assumes ancestor(v) != 0 */
/* if (ancestor(ancestor(v)) != 0) {
* compress(ancestor(ancestor(v)));
* if (semi(label(ancestor(v))) < semi(label(v))) {
* label(v) = label(ancestor(v));
* }
* ancestor(v) = ancestor(ancestor(v));
* }
*/
if (!v->ancestor) {
return;
}
if (v->ancestor->ancestor) {
compress_ancestors(v->ancestor->ancestor);
if (v->ancestor->label->sdom->vertex < v->label->sdom->vertex) {
v->label = v->ancestor->label;
}
v->ancestor = v->ancestor->ancestor;
}
}
static void compute_sdom(struct compile_state *state, struct sdom_block *sd)
{
int i;
/* // step 2
* for each v <= pred(w) {
* u = EVAL(v);
* if (semi[u] < semi[w] {
* semi[w] = semi[u];
* }
* }
* add w to bucket(vertex(semi[w]));
* LINK(parent(w), w);
*
* // step 3
* for each v <= bucket(parent(w)) {
* delete v from bucket(parent(w));
* u = EVAL(v);
* dom(v) = (semi[u] < semi[v]) ? u : parent(w);
* }
*/
for(i = state->last_vertex; i >= 2; i--) {
struct sdom_block *v, *parent, *next;
struct block_set *user;
struct block *block;
block = sd[i].block;
parent = sd[i].parent;
/* Step 2 */
for(user = block->use; user; user = user->next) {
struct sdom_block *v, *u;
v = &sd[user->member->vertex];
u = !(v->ancestor)? v : (compress_ancestors(v), v->label);
if (u->sdom->vertex < sd[i].sdom->vertex) {
sd[i].sdom = u->sdom;
}
}
sdom_block(sd[i].sdom, &sd[i]);
sd[i].ancestor = parent;
/* Step 3 */
for(v = parent->sdominates; v; v = next) {
struct sdom_block *u;
next = v->sdom_next;
unsdom_block(v);
u = (!v->ancestor) ? v : (compress_ancestors(v), v->label);
v->block->idom = (u->sdom->vertex < v->sdom->vertex)?
u->block : parent->block;
}
}
}
static void compute_spdom(struct compile_state *state, struct sdom_block *sd)
{
int i;
/* // step 2
* for each v <= pred(w) {
* u = EVAL(v);
* if (semi[u] < semi[w] {
* semi[w] = semi[u];
* }
* }
* add w to bucket(vertex(semi[w]));
* LINK(parent(w), w);
*
* // step 3
* for each v <= bucket(parent(w)) {
* delete v from bucket(parent(w));
* u = EVAL(v);
* dom(v) = (semi[u] < semi[v]) ? u : parent(w);
* }
*/
for(i = state->last_vertex; i >= 2; i--) {
struct sdom_block *u, *v, *parent, *next;
struct block *block;
block = sd[i].block;
parent = sd[i].parent;
/* Step 2 */
if (block->left) {
v = &sd[block->left->vertex];
u = !(v->ancestor)? v : (compress_ancestors(v), v->label);
if (u->sdom->vertex < sd[i].sdom->vertex) {
sd[i].sdom = u->sdom;
}
}
if (block->right && (block->right != block->left)) {
v = &sd[block->right->vertex];
u = !(v->ancestor)? v : (compress_ancestors(v), v->label);
if (u->sdom->vertex < sd[i].sdom->vertex) {
sd[i].sdom = u->sdom;
}
}
sdom_block(sd[i].sdom, &sd[i]);
sd[i].ancestor = parent;
/* Step 3 */
for(v = parent->sdominates; v; v = next) {
struct sdom_block *u;
next = v->sdom_next;
unsdom_block(v);
u = (!v->ancestor) ? v : (compress_ancestors(v), v->label);
v->block->ipdom = (u->sdom->vertex < v->sdom->vertex)?
u->block : parent->block;
}
}
}
static void compute_idom(struct compile_state *state, struct sdom_block *sd)
{
int i;
for(i = 2; i <= state->last_vertex; i++) {
struct block *block;
block = sd[i].block;
if (block->idom->vertex != sd[i].sdom->vertex) {
block->idom = block->idom->idom;
}
idom_block(block->idom, block);
}
sd[1].block->idom = 0;
}
static void compute_ipdom(struct compile_state *state, struct sdom_block *sd)
{
int i;
for(i = 2; i <= state->last_vertex; i++) {
struct block *block;
block = sd[i].block;
if (block->ipdom->vertex != sd[i].sdom->vertex) {
block->ipdom = block->ipdom->ipdom;
}
ipdom_block(block->ipdom, block);
}
sd[1].block->ipdom = 0;
}
/* Theorem 1:
* Every vertex of a flowgraph G = (V, E, r) except r has
* a unique immediate dominator.
* The edges {(idom(w), w) |w <= V - {r}} form a directed tree
* rooted at r, called the dominator tree of G, such that
* v dominates w if and only if v is a proper ancestor of w in
* the dominator tree.
*/
/* Lemma 1:
* If v and w are vertices of G such that v <= w,
* than any path from v to w must contain a common ancestor
* of v and w in T.
*/
/* Lemma 2: For any vertex w != r, idom(w) -> w */
/* Lemma 3: For any vertex w != r, sdom(w) -> w */
/* Lemma 4: For any vertex w != r, idom(w) -> sdom(w) */
/* Theorem 2:
* Let w != r. Suppose every u for which sdom(w) -> u -> w satisfies
* sdom(u) >= sdom(w). Then idom(w) = sdom(w).
*/
/* Theorem 3:
* Let w != r and let u be a vertex for which sdom(u) is
* minimum amoung vertices u satisfying sdom(w) -> u -> w.
* Then sdom(u) <= sdom(w) and idom(u) = idom(w).
*/
/* Lemma 5: Let vertices v,w satisfy v -> w.
* Then v -> idom(w) or idom(w) -> idom(v)
*/
static void find_immediate_dominators(struct compile_state *state)
{
struct sdom_block *sd;
/* w->sdom = min{v| there is a path v = v0,v1,...,vk = w such that:
* vi > w for (1 <= i <= k - 1}
*/
/* Theorem 4:
* For any vertex w != r.
* sdom(w) = min(
* {v|(v,w) <= E and v < w } U
* {sdom(u) | u > w and there is an edge (v, w) such that u -> v})
*/
/* Corollary 1:
* Let w != r and let u be a vertex for which sdom(u) is
* minimum amoung vertices u satisfying sdom(w) -> u -> w.
* Then:
* { sdom(w) if sdom(w) = sdom(u),
* idom(w) = {
* { idom(u) otherwise
*/
/* The algorithm consists of the following 4 steps.
* Step 1. Carry out a depth-first search of the problem graph.
* Number the vertices from 1 to N as they are reached during
* the search. Initialize the variables used in succeeding steps.
* Step 2. Compute the semidominators of all vertices by applying
* theorem 4. Carry out the computation vertex by vertex in
* decreasing order by number.
* Step 3. Implicitly define the immediate dominator of each vertex
* by applying Corollary 1.
* Step 4. Explicitly define the immediate dominator of each vertex,
* carrying out the computation vertex by vertex in increasing order
* by number.
*/
/* Step 1 initialize the basic block information */
sd = xcmalloc(sizeof(*sd) * (state->last_vertex + 1), "sdom_state");
initialize_sdblock(sd, 0, state->first_block, 0);
#if 0
sd[1].size = 0;
sd[1].label = 0;
sd[1].sdom = 0;
#endif
/* Step 2 compute the semidominators */
/* Step 3 implicitly define the immediate dominator of each vertex */
compute_sdom(state, sd);
/* Step 4 explicitly define the immediate dominator of each vertex */
compute_idom(state, sd);
xfree(sd);
}
static void find_post_dominators(struct compile_state *state)
{
struct sdom_block *sd;
/* Step 1 initialize the basic block information */
sd = xcmalloc(sizeof(*sd) * (state->last_vertex + 1), "sdom_state");
initialize_sdpblock(sd, 0, state->last_block, 0);
/* Step 2 compute the semidominators */
/* Step 3 implicitly define the immediate dominator of each vertex */
compute_spdom(state, sd);
/* Step 4 explicitly define the immediate dominator of each vertex */
compute_ipdom(state, sd);
xfree(sd);
}
static void find_block_domf(struct compile_state *state, struct block *block)
{
struct block *child;
struct block_set *user;
if (block->domfrontier != 0) {
internal_error(state, block->first, "domfrontier present?");
}
for(user = block->idominates; user; user = user->next) {
child = user->member;
if (child->idom != block) {
internal_error(state, block->first, "bad idom");
}
find_block_domf(state, child);
}
if (block->left && block->left->idom != block) {
domf_block(block, block->left);
}
if (block->right && block->right->idom != block) {
domf_block(block, block->right);
}
for(user = block->idominates; user; user = user->next) {
struct block_set *frontier;
child = user->member;
for(frontier = child->domfrontier; frontier; frontier = frontier->next) {
if (frontier->member->idom != block) {
domf_block(block, frontier->member);
}
}
}
}
static void find_block_ipdomf(struct compile_state *state, struct block *block)
{
struct block *child;
struct block_set *user;
if (block->ipdomfrontier != 0) {
internal_error(state, block->first, "ipdomfrontier present?");
}
for(user = block->ipdominates; user; user = user->next) {
child = user->member;
if (child->ipdom != block) {
internal_error(state, block->first, "bad ipdom");
}
find_block_ipdomf(state, child);
}
if (block->left && block->left->ipdom != block) {
ipdomf_block(block, block->left);
}
if (block->right && block->right->ipdom != block) {
ipdomf_block(block, block->right);
}
for(user = block->idominates; user; user = user->next) {
struct block_set *frontier;
child = user->member;
for(frontier = child->ipdomfrontier; frontier; frontier = frontier->next) {
if (frontier->member->ipdom != block) {
ipdomf_block(block, frontier->member);
}
}
}
}
static int print_dominated(
struct compile_state *state, struct block *block, int vertex)
{
struct block_set *user;
if (!block || (block->vertex != vertex + 1)) {
return vertex;
}
vertex += 1;
printf("%d:", block->vertex);
for(user = block->idominates; user; user = user->next) {
printf(" %d", user->member->vertex);
if (user->member->idom != block) {
internal_error(state, user->member->first, "bad idom");
}
}
printf("\n");
vertex = print_dominated(state, block->left, vertex);
vertex = print_dominated(state, block->right, vertex);
return vertex;
}
static void print_dominators(struct compile_state *state)
{
printf("\ndominates\n");
print_dominated(state, state->first_block, 0);
}
static int print_frontiers(
struct compile_state *state, struct block *block, int vertex)
{
struct block_set *user;
if (!block || (block->vertex != vertex + 1)) {
return vertex;
}
vertex += 1;
printf("%d:", block->vertex);
for(user = block->domfrontier; user; user = user->next) {
printf(" %d", user->member->vertex);
}
printf("\n");
vertex = print_frontiers(state, block->left, vertex);
vertex = print_frontiers(state, block->right, vertex);
return vertex;
}
static void print_dominance_frontiers(struct compile_state *state)
{
printf("\ndominance frontiers\n");
print_frontiers(state, state->first_block, 0);
}
static void analyze_idominators(struct compile_state *state)
{
/* Find the immediate dominators */
find_immediate_dominators(state);
/* Find the dominance frontiers */
find_block_domf(state, state->first_block);
/* If debuging print the print what I have just found */
if (state->debug & DEBUG_FDOMINATORS) {
print_dominators(state);
print_dominance_frontiers(state);
print_control_flow(state);
}
}
static int print_ipdominated(
struct compile_state *state, struct block *block, int vertex)
{
struct block_set *user;
if (!block || (block->vertex != vertex + 1)) {
return vertex;
}
vertex += 1;
printf("%d:", block->vertex);
for(user = block->ipdominates; user; user = user->next) {
printf(" %d", user->member->vertex);
if (user->member->ipdom != block) {
internal_error(state, user->member->first, "bad ipdom");
}
}
printf("\n");
for(user = block->use; user; user = user->next) {
vertex = print_ipdominated(state, user->member, vertex);
}
return vertex;
}
static void print_ipdominators(struct compile_state *state)
{
printf("\nipdominates\n");
print_ipdominated(state, state->last_block, 0);
}
static int print_pfrontiers(
struct compile_state *state, struct block *block, int vertex)
{
struct block_set *user;
if (!block || (block->vertex != vertex + 1)) {
return vertex;
}
vertex += 1;
printf("%d:", block->vertex);
for(user = block->ipdomfrontier; user; user = user->next) {
printf(" %d", user->member->vertex);
}
printf("\n");
for(user = block->use; user; user = user->next) {
vertex = print_pfrontiers(state, user->member, vertex);
}
return vertex;
}
static void print_ipdominance_frontiers(struct compile_state *state)
{
printf("\nipdominance frontiers\n");
print_pfrontiers(state, state->last_block, 0);
}
static void analyze_ipdominators(struct compile_state *state)
{
/* Find the post dominators */
find_post_dominators(state);
/* Find the control dependencies (post dominance frontiers) */
find_block_ipdomf(state, state->last_block);
/* If debuging print the print what I have just found */
if (state->debug & DEBUG_RDOMINATORS) {
print_ipdominators(state);
print_ipdominance_frontiers(state);
print_control_flow(state);
}
}
static void insert_phi_operations(struct compile_state *state)
{
size_t size;
struct triple *first;
int *has_already, *work;
struct block *work_list, **work_list_tail;
int iter;
struct triple *var;
size = sizeof(int) * (state->last_vertex + 1);
has_already = xcmalloc(size, "has_already");
work = xcmalloc(size, "work");
iter = 0;
first = state->main_function->left;
for(var = first->next; var != first ; var = var->next) {
struct block *block;
struct triple_set *user;
if ((var->op != OP_ADECL) || !var->use) {
continue;
}
iter += 1;
work_list = 0;
work_list_tail = &work_list;
for(user = var->use; user; user = user->next) {
if (user->member->op == OP_READ) {
continue;
}
if (user->member->op != OP_WRITE) {
internal_error(state, user->member,
"bad variable access");
}
block = user->member->u.block;
if (!block) {
warning(state, user->member, "dead code");
}
work[block->vertex] = iter;
*work_list_tail = block;
block->work_next = 0;
work_list_tail = &block->work_next;
}
for(block = work_list; block; block = block->work_next) {
struct block_set *df;
for(df = block->domfrontier; df; df = df->next) {
struct triple *phi;
struct block *front;
int in_edges;
front = df->member;
if (has_already[front->vertex] >= iter) {
continue;
}
/* Count how many edges flow into this block */
in_edges = front->users;
/* Insert a phi function for this variable */
phi = xcmalloc(in_edges * sizeof(*phi),"phi");
phi = triple(state, OP_PHI, var->type,
phi, var);
phi->filename = front->first->filename;
phi->line = front->first->line;
phi->col = front->first->col;
phi->u.block = front;
use_triple(var, phi);
/* Insert the phi functions immediately after the label */
insert_triple(state, front->first->next, phi);
if (front->first == front->last) {
front->last = front->first->next;
}
has_already[front->vertex] = iter;
/* If necessary plan to visit the basic block */
if (work[front->vertex] >= iter) {
continue;
}
work[front->vertex] = iter;
*work_list_tail = front;
front->work_next = 0;
work_list_tail = &front->work_next;
}
}
}
xfree(has_already);
xfree(work);
}
/*
* C(V)
* S(V)
*/
static void fixup_block_phi_variables(
struct compile_state *state, struct block *parent, struct block *block)
{
struct block_set *set;
struct triple *ptr;
int edge;
if (!parent || !block)
return;
/* Find the edge I am coming in on */
edge = 0;
for(set = block->use; set; set = set->next, edge++) {
if (set->member == parent) {
break;
}
}
if (!set) {
internal_error(state, 0, "phi input is not on a control predecessor");
}
for(ptr = block->first; ; ptr = ptr->next) {
if (ptr->op == OP_PHI) {
struct triple *var, *val, **slot;
var = ptr->right;
/* Find the current value of the variable */
val = var->use->member;
if ((val->op == OP_WRITE) || (val->op == OP_READ)) {
internal_error(state, val, "bad value in phi");
}
slot = (struct triple **)(ptr->left);
slot += edge;
if ((*slot != 0) && (*slot != val)) {
internal_error(state, ptr, "phi already bound on this edge");
}
*slot = val;
use_triple(val, ptr);
}
if (ptr == block->last) {
break;
}
}
}
static void rename_block_variables(
struct compile_state *state, struct block *block)
{
struct block_set *user;
struct triple *ptr, *next, *last;
int done;
if (!block)
return;
last = block->first;
done = 0;
for(ptr = block->first; !done; ptr = next) {
next = ptr->next;
if (ptr == block->last) {
done = 1;
}
/* RHS(A) */
if (ptr->op == OP_READ) {
struct triple *var, *val;
var = ptr->left;
unuse_triple(var, ptr);
if (!var->use) {
error(state, ptr, "variable used without being set");
}
/* Find the current value of the variable */
val = var->use->member;
if ((val->op == OP_WRITE) || (val->op == OP_READ)) {
internal_error(state, val, "bad value in read");
}
propogate_use(state, ptr, val);
release_triple(state, ptr);
continue;
}
/* LHS(A) */
if (ptr->op == OP_WRITE) {
struct triple *var, *val;
var = ptr->left;
val = ptr->right;
if ((val->op == OP_WRITE) || (val->op == OP_READ)) {
internal_error(state, val, "bad value in write");
}
propogate_use(state, ptr, val);
unuse_triple(var, ptr);
/* Push OP_WRITE ptr->right onto a stack of variable uses */
push_triple(var, val);
}
if (ptr->op == OP_PHI) {
struct triple *var;
var = ptr->right;
/* Push OP_PHI onto a stack of variable uses */
push_triple(var, ptr);
}
last = ptr;
}
block->last = last;
/* Fixup PHI functions in the cf successors */
fixup_block_phi_variables(state, block, block->left);
fixup_block_phi_variables(state, block, block->right);
/* rename variables in the dominated nodes */
for(user = block->idominates; user; user = user->next) {
rename_block_variables(state, user->member);
}
/* pop the renamed variable stack */
last = block->first;
done = 0;
for(ptr = block->first; !done ; ptr = next) {
next = ptr->next;
if (ptr == block->last) {
done = 1;
}
if (ptr->op == OP_WRITE) {
struct triple *var;
var = ptr->left;
/* Pop OP_WRITE ptr->right from the stack of variable uses */
pop_triple(var, ptr->right);
release_triple(state, ptr);
continue;
}
if (ptr->op == OP_PHI) {
struct triple *var;
var = ptr->right;
/* Pop OP_WRITE ptr->right from the stack of variable uses */
pop_triple(var, ptr);
}
last = ptr;
}
block->last = last;
}
static void prune_block_variables(struct compile_state *state,
struct block *block)
{
struct block_set *user;
struct triple *next, *last, *ptr;
int done;
last = block->first;
done = 0;
for(ptr = block->first; !done; ptr = next) {
next = ptr->next;
if (ptr == block->last) {
done = 1;
}
if (ptr->op == OP_ADECL) {
struct triple_set *user, *next;
for(user = ptr->use; user; user = next) {
struct triple *use;
next = user->next;
use = user->member;
if (use->op != OP_PHI) {
internal_error(state, use, "decl still used");
}
if (use->right != ptr) {
internal_error(state, use, "bad phi use of decl");
}
unuse_triple(ptr, use);
use->right = 0;
}
release_triple(state, ptr);
continue;
}
last = ptr;
}
block->last = last;
for(user = block->idominates; user; user = user->next) {
prune_block_variables(state, user->member);
}
}
static void transform_to_ssa_form(struct compile_state *state)
{
insert_phi_operations(state);
#if 0
printf("@%s:%d\n", __FILE__, __LINE__);
print_blocks(state);
#endif
rename_block_variables(state, state->first_block);
prune_block_variables(state, state->first_block);
}
static void transform_from_ssa_form(struct compile_state *state)
{
/* To get out of ssa form we insert moves on the incoming
* edges to blocks containting phi functions.
*/
struct triple *first;
struct triple *phi, *next;
/* Walk all of the operations to find the phi functions */
first = state->main_function->left;
for(phi = first->next; phi != first ; phi = next) {
struct block_set *set;
struct block *block;
struct triple **slot;
struct triple *var, *read;
int edge;
next = phi->next;
if (phi->op != OP_PHI) {
continue;
}
block = phi->u.block;
slot = (struct triple **)(phi->left);
/* A variable to replace the phi function */
var = post_triple(state, phi, OP_ADECL, phi->type, 0,0);
/* A read of the single value that is set into the variable */
read = post_triple(state, var, OP_READ, phi->type, var, 0);
use_triple(var, read);
/* Replaces uses of the phi with variable reads */
propogate_use(state, phi, read);
/* Walk all of the incoming edges/blocks and insert moves.
*/
for(edge = 0, set = block->use; set; set = set->next, edge++) {
struct block *eblock;
struct triple *move;
struct triple *val;
eblock = set->member;
val = slot[edge];
unuse_triple(val, phi);
if (val == phi) {
continue;
}
move = post_triple(state,
val, OP_WRITE, phi->type, var, val);
use_triple(val, move);
use_triple(var, move);
}
release_triple(state, phi);
}
}
static void insert_copies_to_phi(struct compile_state *state)
{
/* To get out of ssa form we insert moves on the incoming
* edges to blocks containting phi functions.
*/
struct triple *first;
struct triple *phi;
/* Walk all of the operations to find the phi functions */
first = state->main_function->left;
for(phi = first->next; phi != first ; phi = phi->next) {
struct block_set *set;
struct block *block;
struct triple **slot;
int edge;
if (phi->op != OP_PHI) {
continue;
}
if (ID_REG(phi->id) == REG_UNSET) {
phi->id = MK_REG_ID(alloc_virtual_reg(),
ID_REG_CLASSES(phi->id));
}
block = phi->u.block;
slot = (struct triple **)(phi->left);
/* Walk all of the incoming edges/blocks and insert moves.
*/
for(edge = 0, set = block->use; set; set = set->next, edge++) {
struct block *eblock;
struct triple *move;
struct triple *val;
struct triple *ptr;
eblock = set->member;
val = slot[edge];
if (val == phi) {
continue;
}
move = build_triple(state, OP_COPY, phi->type, val, 0,
val->filename, val->line, val->col);
move->u.block = eblock;
move->id = phi->id;
use_triple(val, move);
slot[edge] = move;
unuse_triple(val, phi);
use_triple(move, phi);
/* Walk through the block backwards to find
* an appropriate location for the OP_COPY.
*/
for(ptr = eblock->last; ptr != eblock->first; ptr = ptr->prev) {
struct triple **expr;
if ((ptr == phi) || (ptr == val)) {
goto out;
}
expr = triple_rhs(state, ptr, 0);
for(;expr; expr = triple_rhs(state, ptr, expr)) {
if ((*expr) == phi) {
goto out;
}
}
}
out:
if (triple_is_branch(ptr)) {
internal_error(state, ptr,
"Could not insert write to phi");
}
insert_triple(state, ptr->next, move);
if (eblock->last == ptr) {
eblock->last = move;
}
}
}
}
struct triple_reg_set {
struct triple_reg_set *next;
struct triple *member;
struct triple *new;
};
struct reg_block {
struct block *block;
struct triple_reg_set *in;
struct triple_reg_set *out;
int vertex;
};
static int do_triple_set(struct triple_reg_set **head,
struct triple *member, struct triple *new_member)
{
struct triple_reg_set **ptr, *new;
if (!member)
return 0;
ptr = head;
while(*ptr) {
if ((*ptr)->member == member) {
return 0;
}
ptr = &(*ptr)->next;
}
new = xcmalloc(sizeof(*new), "triple_set");
new->member = member;
new->new = new_member;
new->next = *head;
*head = new;
return 1;
}
static void do_triple_unset(struct triple_reg_set **head, struct triple *member)
{
struct triple_reg_set *entry, **ptr;
ptr = head;
while(*ptr) {
entry = *ptr;
if (entry->member == member) {
*ptr = entry->next;
xfree(entry);
return;
}
else {
ptr = &entry->next;
}
}
}
static int in_triple(struct reg_block *rb, struct triple *in)
{
return do_triple_set(&rb->in, in, 0);
}
static void unin_triple(struct reg_block *rb, struct triple *unin)
{
do_triple_unset(&rb->in, unin);
}
static int out_triple(struct reg_block *rb, struct triple *out)
{
return do_triple_set(&rb->out, out, 0);
}
static void unout_triple(struct reg_block *rb, struct triple *unout)
{
do_triple_unset(&rb->out, unout);
}
static int initialize_regblock(struct reg_block *blocks,
struct block *block, int vertex)
{
struct block_set *user;
if (!block || (blocks[block->vertex].block == block)) {
return vertex;
}
vertex += 1;
/* Renumber the blocks in a convinient fashion */
block->vertex = vertex;
blocks[vertex].block = block;
blocks[vertex].vertex = vertex;
for(user = block->use; user; user = user->next) {
vertex = initialize_regblock(blocks, user->member, vertex);
}
return vertex;
}
static int phi_in(struct compile_state *state, struct reg_block *blocks,
struct reg_block *rb, struct block *suc)
{
/* Read the conditional input set of a successor block
* (i.e. the input to the phi nodes) and place it in the
* current blocks output set.
*/
struct block_set *set;
struct triple *ptr;
int edge;
int done, change;
change = 0;
/* Find the edge I am coming in on */
for(edge = 0, set = suc->use; set; set = set->next, edge++) {
if (set->member == rb->block) {
break;
}
}
if (!set) {
internal_error(state, 0, "Not coming on a control edge?");
}
for(done = 0, ptr = suc->first; !done; ptr = ptr->next) {
struct triple **slot, *expr, *ptr2;
int out_change, done2;
done = (ptr == suc->last);
if (ptr->op != OP_PHI) {
continue;
}
slot = (struct triple **)(ptr->left);
expr = slot[edge];
out_change = out_triple(rb, expr);
if (!out_change) {
continue;
}
/* If we don't define the variable also plast it
* in the current blocks input set.
*/
ptr2 = rb->block->first;
for(done2 = 0; !done2; ptr2 = ptr2->next) {
if (ptr2 == expr) {
break;
}
done2 = (ptr2 == rb->block->last);
}
if (!done2) {
continue;
}
change |= in_triple(rb, expr);
}
return change;
}
static int reg_in(struct compile_state *state, struct reg_block *blocks,
struct reg_block *rb, struct block *suc)
{
struct triple_reg_set *in_set;
int change;
change = 0;
/* Read the input set of a successor block
* and place it in the current blocks output set.
*/
in_set = blocks[suc->vertex].in;
for(; in_set; in_set = in_set->next) {
int out_change, done;
struct triple *first, *last, *ptr;
out_change = out_triple(rb, in_set->member);
if (!out_change) {
continue;
}
/* If we don't define the variable also place it
* in the current blocks input set.
*/
first = rb->block->first;
last = rb->block->last;
done = 0;
for(ptr = first; !done; ptr = ptr->next) {
if (ptr == in_set->member) {
break;
}
done = (ptr == last);
}
if (!done) {
continue;
}
change |= in_triple(rb, in_set->member);
}
change |= phi_in(state, blocks, rb, suc);
return change;
}
static int use_in(struct compile_state *state, struct reg_block *rb)
{
/* Find the variables we use but don't define and add
* it to the current blocks input set.
*/
#warning "FIXME is this O(N^2) algorithm bad?"
struct block *block;
struct triple *ptr;
int done;
int change;
block = rb->block;
change = 0;
for(done = 0, ptr = block->last; !done; ptr = ptr->prev) {
struct triple **expr;
done = (ptr == block->first);
/* The variable a phi function uses depends on the
* control flow, and is handled in phi_in, not
* here.
*/
if (ptr->op == OP_PHI) {
continue;
}
expr = triple_rhs(state, ptr, 0);
for(;expr; expr = triple_rhs(state, ptr, expr)) {
struct triple *rhs, *test;
int tdone;
rhs = *expr;
/* See if rhs is defined in this block */
for(tdone = 0, test = ptr; !tdone; test = test->prev) {
tdone = (test == block->first);
if (test == rhs) {
rhs = 0;
break;
}
}
/* If the triple is not a definition skip it. */
if (!triple_is_def(ptr)) {
continue;
}
/* If I still have a valid rhs add it to in */
change |= in_triple(rb, rhs);
}
}
return change;
}
static struct reg_block *compute_variable_lifetimes(
struct compile_state *state)
{
struct reg_block *blocks;
int change;
blocks = xcmalloc(
sizeof(*blocks)*(state->last_vertex + 1), "reg_block");
initialize_regblock(blocks, state->last_block, 0);
do {
int i;
change = 0;
for(i = 1; i <= state->last_vertex; i++) {
struct reg_block *rb;
rb = &blocks[i];
/* Add the left successor's input set to in */
if (rb->block->left) {
change |= reg_in(state, blocks, rb, rb->block->left);
}
/* Add the right successor's input set to in */
if ((rb->block->right) &&
(rb->block->right != rb->block->left)) {
change |= reg_in(state, blocks, rb, rb->block->right);
}
/* Add use to in... */
change |= use_in(state, rb);
}
} while(change);
return blocks;
}
static void free_variable_lifetimes(
struct compile_state *state, struct reg_block *blocks)
{
int i;
/* free in_set && out_set on each block */
for(i = 1; i <= state->last_vertex; i++) {
struct triple_reg_set *entry, *next;
struct reg_block *rb;
rb = &blocks[i];
for(entry = rb->in; entry ; entry = next) {
next = entry->next;
do_triple_unset(&rb->in, entry->member);
}
for(entry = rb->out; entry; entry = next) {
next = entry->next;
do_triple_unset(&rb->out, entry->member);
}
}
xfree(blocks);
}
typedef struct triple *(*wvl_cb_t)(
struct compile_state *state,
struct reg_block *blocks, struct triple_reg_set *live,
struct reg_block *rb, struct triple *ins, void *arg);
static void walk_variable_lifetimes(struct compile_state *state,
struct reg_block *blocks, wvl_cb_t cb, void *arg)
{
int i;
for(i = 1; i <= state->last_vertex; i++) {
struct triple_reg_set *live;
struct triple_reg_set *entry, *next;
struct triple *ptr, *prev;
struct reg_block *rb;
struct block *block;
int done;
/* Get the blocks */
rb = &blocks[i];
block = rb->block;
/* Copy out into live */
live = 0;
for(entry = rb->out; entry; entry = next) {
next = entry->next;
do_triple_set(&live, entry->member, entry->new);
}
/* Walk through the basic block calculating live */
for(done = 0, ptr = block->last; !done; ptr = prev) {
struct triple **expr;
prev = ptr->prev;
done = (ptr == block->first);
/* Remove the current definition from live */
do_triple_unset(&live, ptr);
/* If the current instruction was deleted continue */
if (!cb(state, blocks, live, rb, ptr, arg)) {
if (block->last == ptr) {
block->last = prev;
}
continue;
}
/* Add the current uses to live.
*
* It is safe to skip phi functions because they do
* not have any block local uses, and the block
* output sets already properly account for what
* control flow depedent uses phi functions do have.
*/
if (ptr->op == OP_PHI) {
continue;
}
expr = triple_rhs(state, ptr, 0);
for(;expr; expr = triple_rhs(state, ptr, expr)) {
/* If the triple is not a definition skip it. */
if (!triple_is_def(*expr)) {
continue;
}
do_triple_set(&live, *expr, 0);
}
}
/* Free live */
for(entry = live; entry; entry = next) {
next = entry->next;
do_triple_unset(&live, entry->member);
}
}
}
static int count_triples(struct compile_state *state)
{
struct triple *first, *ins;
int triples = 0;
first = state->main_function->left;
ins = first;
do {
triples++;
ins = ins->next;
} while (ins != first);
return triples;
}
struct dead_triple {
struct triple *triple;
struct dead_triple *work_next;
struct block *block;
int color;
int flags;
#define TRIPLE_FLAG_ALIVE 1
};
static void awaken(
struct compile_state *state,
struct dead_triple *dtriple, struct triple **expr,
struct dead_triple ***work_list_tail)
{
struct triple *triple;
struct dead_triple *dt;
if (!expr) {
return;
}
triple = *expr;
if (!triple) {
return;
}
if (triple->id <= 0) {
internal_error(state, triple, "bad triple id: %d",
triple->id);
}
if (triple->op == OP_NOOP) {
internal_warning(state, triple, "awakening noop?");
return;
}
dt = &dtriple[triple->id];
if (!(dt->flags & TRIPLE_FLAG_ALIVE)) {
dt->flags |= TRIPLE_FLAG_ALIVE;
if (!dt->work_next) {
**work_list_tail = dt;
*work_list_tail = &dt->work_next;
}
}
}
static void eliminate_inefectual_code(struct compile_state *state)
{
struct block *block;
struct dead_triple *dtriple, *work_list, **work_list_tail, *dt;
int triples, i;
struct triple *first, *ins;
/* Setup the work list */
work_list = 0;
work_list_tail = &work_list;
first = state->main_function->left;
/* Count how many triples I have */
triples = count_triples(state);
/* Now put then in an array and mark all of the triples dead */
dtriple = xcmalloc(sizeof(*dtriple) * (triples + 1), "dtriples");
ins = first;
i = 1;
block = 0;
do {
if (ins->op == OP_LABEL) {
block = ins->u.block;
}
dtriple[i].triple = ins;
dtriple[i].block = block;
dtriple[i].flags = 0;
dtriple[i].color = ins->id;
ins->id = i;
/* See if it is an operation we always keep */
#warning "FIXME handle the case of killing a branch instruction"
if (!triple_is_pure(state, ins) || triple_is_branch(ins)) {
awaken(state, dtriple, &ins, &work_list_tail);
}
i++;
ins = ins->next;
} while(ins != first);
while(work_list) {
struct dead_triple *dt;
struct block_set *user;
struct triple **expr;
dt = work_list;
work_list = dt->work_next;
if (!work_list) {
work_list_tail = &work_list;
}
/* Wake up the data depencencies of this triple */
expr = 0;
do {
expr = triple_rhs(state, dt->triple, expr);
awaken(state, dtriple, expr, &work_list_tail);
} while(expr);
do {
expr = triple_lhs(state, dt->triple, expr);
awaken(state, dtriple, expr, &work_list_tail);
} while(expr);
/* Wake up the forward control dependencies */
do {
expr = triple_targ(state, dt->triple, expr);
awaken(state, dtriple, expr, &work_list_tail);
} while(expr);
/* Wake up the reverse control dependencies of this triple */
for(user = dt->block->ipdomfrontier; user; user = user->next) {
awaken(state, dtriple, &user->member->last, &work_list_tail);
}
}
for(dt = &dtriple[1]; dt <= &dtriple[triples]; dt++) {
if ((dt->triple->op == OP_NOOP) &&
(dt->flags & TRIPLE_FLAG_ALIVE)) {
internal_error(state, dt->triple, "noop effective?");
}
dt->triple->id = dt->color; /* Restore the color */
if (!(dt->flags & TRIPLE_FLAG_ALIVE)) {
#warning "FIXME handle the case of killing a basic block"
if (dt->block->first == dt->triple) {
continue;
}
if (dt->block->last == dt->triple) {
dt->block->last = dt->triple->prev;
}
release_triple(state, dt->triple);
}
}
xfree(dtriple);
}
struct live_range_edge;
struct live_range {
struct live_range_edge *edges;
struct triple *def;
unsigned color;
unsigned classes;
unsigned degree;
struct live_range *group_next, **group_prev;
};
struct live_range_edge {
struct live_range_edge *next;
struct live_range *node;
};
#define LRE_HASH_SIZE 2048
struct lre_hash {
struct lre_hash *next;
struct live_range *left;
struct live_range *right;
};
struct reg_state {
struct lre_hash *hash[LRE_HASH_SIZE];
struct reg_block *blocks;
struct live_range *lr;
struct live_range *low, **low_tail;
struct live_range *high, **high_tail;
unsigned ranges;
};
static unsigned regc_max_size(struct compile_state *state, int classes)
{
unsigned max_size;
int i;
max_size = 0;
for(i = 0; i < MAX_REGC; i++) {
if (classes & (1 << i)) {
unsigned size;
size = arch_regc_size(state, i);
if (size > max_size) {
max_size = size;
}
}
}
return max_size;
}
static int reg_is_reg(struct compile_state *state, int reg1, int reg2)
{
unsigned equivs[MAX_REG_EQUIVS];
int i;
if ((reg1 < 0) || (reg1 >= MAX_REGISTERS)) {
internal_error(state, 0, "invalid register");
}
if ((reg2 < 0) || (reg2 >= MAX_REGISTERS)) {
internal_error(state, 0, "invalid register");
}
arch_reg_equivs(state, equivs, reg1);
for(i = 0; (i < MAX_REG_EQUIVS) && equivs[i] != REG_UNSET; i++) {
if (equivs[i] == reg2) {
return 1;
}
}
return 0;
}
static void reg_fill_used(struct compile_state *state, char *used, int reg)
{
unsigned equivs[MAX_REG_EQUIVS];
int i;
arch_reg_equivs(state, equivs, reg);
for(i = 0; (i < MAX_REG_EQUIVS) && equivs[i] != REG_UNSET; i++) {
used[equivs[i]] = 1;
}
return;
}
static unsigned int hash_live_edge(
struct live_range *left, struct live_range *right)
{
unsigned int hash, val;
unsigned long lval, rval;
lval = ((unsigned long)left)/sizeof(struct live_range);
rval = ((unsigned long)right)/sizeof(struct live_range);
hash = 0;
while(lval) {
val = lval & 0xff;
lval >>= 8;
hash = (hash *263) + val;
}
while(rval) {
val = rval & 0xff;
rval >>= 8;
hash = (hash *263) + val;
}
hash = hash & (LRE_HASH_SIZE - 1);
return hash;
}
static struct lre_hash **lre_probe(struct reg_state *rstate,
struct live_range *left, struct live_range *right)
{
struct lre_hash **ptr;
unsigned int index;
/* Ensure left <= right */
if (left > right) {
struct live_range *tmp;
tmp = left;
left = right;
right = tmp;
}
index = hash_live_edge(left, right);
ptr = &rstate->hash[index];
while((*ptr) && ((*ptr)->left != left) && ((*ptr)->right != right)) {
ptr = &(*ptr)->next;
}
return ptr;
}
static int interfere(struct reg_state *rstate,
struct live_range *left, struct live_range *right)
{
struct lre_hash **ptr;
ptr = lre_probe(rstate, left, right);
return ptr && *ptr;
}
static void add_live_edge(struct reg_state *rstate,
struct live_range *left, struct live_range *right)
{
/* FIXME the memory allocation overhead is noticeable here... */
struct lre_hash **ptr, *new_hash;
struct live_range_edge *edge;
if (left == right) {
return;
}
if ((left == &rstate->lr[0]) || (right == &rstate->lr[0])) {
return;
}
/* Ensure left <= right */
if (left > right) {
struct live_range *tmp;
tmp = left;
left = right;
right = tmp;
}
ptr = lre_probe(rstate, left, right);
if (*ptr) {
return;
}
new_hash = xmalloc(sizeof(*new_hash), "lre_hash");
new_hash->next = *ptr;
new_hash->left = left;
new_hash->right = right;
*ptr = new_hash;
edge = xmalloc(sizeof(*edge), "live_range_edge");
edge->next = left->edges;
edge->node = right;
left->edges = edge;
left->degree += 1;
edge = xmalloc(sizeof(*edge), "live_range_edge");
edge->next = right->edges;
edge->node = left;
right->edges = edge;
right->degree += 1;
}
static void remove_live_edge(struct reg_state *rstate,
struct live_range *left, struct live_range *right)
{
struct live_range_edge *edge, **ptr;
struct lre_hash **hptr, *entry;
hptr = lre_probe(rstate, left, right);
if (!hptr || !*hptr) {
return;
}
entry = *hptr;
*hptr = entry->next;
xfree(entry);
for(ptr = &left->edges; *ptr; ptr = &(*ptr)->next) {
edge = *ptr;
if (edge->node == right) {
*ptr = edge->next;
memset(edge, 0, sizeof(*edge));
xfree(edge);
break;
}
}
for(ptr = &right->edges; *ptr; ptr = &(*ptr)->next) {
edge = *ptr;
if (edge->node == left) {
*ptr = edge->next;
memset(edge, 0, sizeof(*edge));
xfree(edge);
break;
}
}
}
static void remove_live_edges(struct reg_state *rstate, struct live_range *range)
{
struct live_range_edge *edge, *next;
for(edge = range->edges; edge; edge = next) {
next = edge->next;
remove_live_edge(rstate, range, edge->node);
}
}
/* Interference graph...
*
* new(n) --- Return a graph with n nodes but no edges.
* add(g,x,y) --- Return a graph including g with an between x and y
* interfere(g, x, y) --- Return true if there exists an edge between the nodes
* x and y in the graph g
* degree(g, x) --- Return the degree of the node x in the graph g
* neighbors(g, x, f) --- Apply function f to each neighbor of node x in the graph g
*
* Implement with a hash table && a set of adjcency vectors.
* The hash table supports constant time implementations of add and interfere.
* The adjacency vectors support an efficient implementation of neighbors.
*/
/*
* +---------------------------------------------------+
* | +--------------+ |
* v v | |
* renumber -> build graph -> colalesce -> spill_costs -> simplify -> select
*
* -- In simplify implment optimistic coloring... (No backtracking)
* -- Implement Rematerialization it is the only form of spilling we can perform
* Essentially this means dropping a constant from a register because
* we can regenerate it later.
*
* --- Very conservative colalescing (don't colalesce just mark the opportunities)
* coalesce at phi points...
* --- Bias coloring if at all possible do the coalesing a compile time.
*
*
*/
static void different_colored(
struct compile_state *state, struct reg_state *rstate,
struct triple *parent, struct triple *ins)
{
struct live_range *lr;
struct triple **expr;
lr = &rstate->lr[ins->id];
expr = triple_rhs(state, ins, 0);
for(;expr; expr = triple_rhs(state, ins, expr)) {
struct live_range *lr2;
if ((*expr == parent) || (*expr == ins)) {
continue;
}
lr2 = &rstate->lr[(*expr)->id];
if (lr->color == lr2->color) {
internal_error(state, ins, "live range too big");
}
}
}
static void initialize_live_ranges(
struct compile_state *state, struct reg_state *rstate)
{
struct triple *ins, *first;
size_t size;
int i;
first = state->main_function->left;
/* First count how many live ranges I will need.
*/
rstate->ranges = count_triples(state);
size = sizeof(rstate->lr[0]) * (rstate->ranges + 1);
rstate->lr = xcmalloc(size, "live_range");
/* Setup the dummy live range */
rstate->lr[0].classes = 0;
rstate->lr[0].color = REG_UNSET;
rstate->lr[0].def = 0;
i = 0;
ins = first;
do {
unsigned color, classes;
/* Find the architecture specific color information */
color = ID_REG(ins->id);
classes = ID_REG_CLASSES(ins->id);
if ((color != REG_UNSET) && (color < MAX_REGISTERS)) {
classes = arch_reg_regcm(state, color);
}
/* If the triple is a variable definition give it a live range. */
if (triple_is_def(ins)) {
i++;
ins->id = i;
rstate->lr[i].def = ins;
rstate->lr[i].color = color;
rstate->lr[i].classes = classes;
rstate->lr[i].degree = 0;
if (!classes) {
internal_error(state, ins,
"live range without a class");
}
}
/* Otherwise give the triple the dummy live range. */
else {
ins->id = 0;
}
ins = ins->next;
} while(ins != first);
rstate->ranges = i;
/* Make a second pass to handle achitecture specific register
* constraints.
*/
ins = first;
do {
struct live_range *lr;
lr = &rstate->lr[ins->id];
if (lr->color != REG_UNSET) {
struct triple **expr;
/* This assumes the virtual register is only
* used by one input operation.
*/
expr = triple_rhs(state, ins, 0);
for(;expr; expr = triple_rhs(state, ins, expr)) {
struct live_range *lr2;
if (ins == *expr) {
continue;
}
lr2 = &rstate->lr[(*expr)->id];
if (lr->color == lr2->color) {
different_colored(state, rstate,
ins, *expr);
(*expr)->id = ins->id;
}
}
}
ins = ins->next;
} while(ins != first);
/* Make a third pass and forget the virtual registers */
for(i = 1; i <= rstate->ranges; i++) {
if (rstate->lr[i].color >= MAX_REGISTERS) {
rstate->lr[i].color = REG_UNSET;
}
}
}
static struct triple *graph_ins(
struct compile_state *state,
struct reg_block *blocks, struct triple_reg_set *live,
struct reg_block *rb, struct triple *ins, void *arg)
{
struct reg_state *rstate = arg;
struct live_range *def;
struct triple_reg_set *entry;
/* If the triple does not start a live range
* we do not have a definition to add to
* the interference graph.
*/
if (ins->id <= 0) {
return ins;
}
def = &rstate->lr[ins->id];
/* Create an edge between ins and everything that is
* alive, unless the live_range cannot share
* a physical register with ins.
*/
for(entry = live; entry; entry = entry->next) {
struct live_range *lr;
lr= &rstate->lr[entry->member->id];
if (!arch_regcm_intersect(def->classes, lr->classes)) {
continue;
}
add_live_edge(rstate, def, lr);
}
return ins;
}
static struct triple *print_interference_ins(
struct compile_state *state,
struct reg_block *blocks, struct triple_reg_set *live,
struct reg_block *rb, struct triple *ins, void *arg)
{
struct reg_state *rstate = arg;
struct live_range *lr;
lr = &rstate->lr[ins->id];
if ((ins->op == OP_LABEL) && (ins->use)) {
printf("\n%p:\n", ins);
}
else if (ins->op == OP_INTCONST) {
printf("(%p) %-7s %08lx @ %s:%d.%d\n",
ins, tops(ins->op), ins->u.cval,
ins->filename, ins->line, ins->col);
}
else {
printf("(%p) %-7s %-10p %-10p @ %s:%d.%d\n",
ins, tops(ins->op), ins->left, ins->right,
ins->filename, ins->line, ins->col);
}
if (live) {
struct triple_reg_set *entry;
printf(" live:");
for(entry = live; entry; entry = entry->next) {
printf(" %-10p", entry->member);
}
printf("\n");
}
if (lr->edges) {
struct live_range_edge *entry;
printf(" edges:");
for(entry = lr->edges; entry; entry = entry->next) {
printf(" %-10p", entry->node->def);
}
printf("\n");
}
if (triple_is_branch(ins)) {
printf("\n");
}
return ins;
}
#if DEBUG_COLOR_GRAPH > 1
#define cgdebug_printf(...) fprintf(stdout, __VA_ARGS__)
#define cgdebug_flush() fflush(stdout)
#elif DEBUG_COLOR_GRAPH == 1
#define cgdebug_printf(...) fprintf(stderr, __VA_ARGS__)
#define cgdebug_flush() fflush(stderr)
#else
#define cgdebug_printf(...)
#define cgdebug_flush()
#endif
static void select_free_color(struct compile_state *state,
struct reg_state *rstate, struct live_range *range)
{
struct triple_set *entry;
struct live_range *phi;
struct live_range_edge *edge;
char used[MAX_REGISTERS];
struct triple **expr;
/* If a color is already assigned don't change it */
if (range->color != REG_UNSET) {
return;
}
/* Instead of doing just the trivial color select here I try
* a few extra things because a good color selection will help reduce
* copies.
*/
/* Find the registers currently in use */
memset(used, 0, sizeof(used));
for(edge = range->edges; edge; edge = edge->next) {
if (edge->node->color == REG_UNSET) {
continue;
}
reg_fill_used(state, used, edge->node->color);
}
#if DEBUG_COLOR_GRAPH > 1
{
int i;
i = 0;
for(edge = range->edges; edge; edge = edge->next) {
i++;
}
cgdebug_printf("\n%s edges: %d @%s:%d.%d\n",
tops(range->def->op), i,
range->def->filename, range->def->line, range->def->col);
for(i = 0; i < MAX_REGISTERS; i++) {
if (used[i]) {
cgdebug_printf("used: %s\n",
arch_reg_str(i));
}
}
}
#endif
/* If I feed into an expression reuse it's color.
* This should help remove copies in the case of 2 register instructions
* and phi functions.
*/
phi = 0;
entry = range->def->use;
for(;(range->color == REG_UNSET) && entry; entry = entry->next) {
struct live_range *lr;
lr = &rstate->lr[entry->member->id];
if (entry->member->id == 0) {
continue;
}
if (!phi && (lr->def->op == OP_PHI) &&
!interfere(rstate, range, lr)) {
phi = lr;
}
if ((lr->color == REG_UNSET) ||
((lr->classes & range->classes) == 0) ||
(used[lr->color])) {
continue;
}
if (interfere(rstate, range, lr)) {
continue;
}
range->color = lr->color;
}
/* If I feed into a phi function reuse it's color of the color
* of something else that feeds into the phi function.
*/
if (phi) {
if (phi->color != REG_UNSET) {
if (used[phi->color]) {
range->color = phi->color;
}
}
else {
expr = triple_rhs(state, phi->def, 0);
for(; expr; expr = triple_rhs(state, phi->def, expr)) {
struct live_range *lr;
lr = &rstate->lr[(*expr)->id];
if ((lr->color == REG_UNSET) ||
((lr->classes & range->classes) == 0) ||
(used[lr->color])) {
continue;
}
if (interfere(rstate, range, lr)) {
continue;
}
range->color = lr->color;
}
}
}
/* If I don't interfere with a rhs node reuse it's color */
if (range->color == REG_UNSET) {
expr = triple_rhs(state, range->def, 0);
for(; expr; expr = triple_rhs(state, range->def, expr)) {
struct live_range *lr;
lr = &rstate->lr[(*expr)->id];
if ((lr->color == -1) ||
((lr->classes & range->classes) == 0) ||
(used[lr->color])) {
continue;
}
if (interfere(rstate, range, lr)) {
continue;
}
range->color = lr->color;
break;
}
}
/* If I have not opportunitically picked a useful color
* pick the first color that is free.
*/
if (range->color == REG_UNSET) {
range->color =
arch_select_free_register(state, used, range->classes);
}
if (range->color == REG_UNSET) {
int i;
for(edge = range->edges; edge; edge = edge->next) {
if (edge->node->color == REG_UNSET) {
continue;
}
warning(state, edge->node->def, "reg %s",
arch_reg_str(edge->node->color));
}
warning(state, range->def, "classes: %x",
range->classes);
for(i = 0; i < MAX_REGISTERS; i++) {
if (used[i]) {
warning(state, range->def, "used: %s",
arch_reg_str(i));
}
}
#if DEBUG_COLOR_GRAPH < 2
error(state, range->def, "too few registers");
#else
internal_error(state, range->def, "too few registers");
#endif
}
range->classes = arch_reg_regcm(state, range->color);
return;
}
static void color_graph(struct compile_state *state, struct reg_state *rstate)
{
struct live_range_edge *edge;
struct live_range *range;
if (rstate->low) {
cgdebug_printf("Lo: ");
range = rstate->low;
if (*range->group_prev != range) {
internal_error(state, 0, "lo: *prev != range?");
}
*range->group_prev = range->group_next;
if (range->group_next) {
range->group_next->group_prev = range->group_prev;
}
if (&range->group_next == rstate->low_tail) {
rstate->low_tail = range->group_prev;
}
if (rstate->low == range) {
internal_error(state, 0, "low: next != prev?");
}
}
else if (rstate->high) {
cgdebug_printf("Hi: ");
range = rstate->high;
if (*range->group_prev != range) {
internal_error(state, 0, "hi: *prev != range?");
}
*range->group_prev = range->group_next;
if (range->group_next) {
range->group_next->group_prev = range->group_prev;
}
if (&range->group_next == rstate->high_tail) {
rstate->high_tail = range->group_prev;
}
if (rstate->high == range) {
internal_error(state, 0, "high: next != prev?");
}
}
else {
return;
}
cgdebug_printf(" %d\n", range - rstate->lr);
range->group_prev = 0;
for(edge = range->edges; edge; edge = edge->next) {
struct live_range *node;
node = edge->node;
/* Move nodes from the high to the low list */
if (node->group_prev && (node->color == REG_UNSET) &&
(node->degree == regc_max_size(state, node->classes))) {
if (*node->group_prev != node) {
internal_error(state, 0, "move: *prev != node?");
}
*node->group_prev = node->group_next;
if (node->group_next) {
node->group_next->group_prev = node->group_prev;
}
if (&node->group_next == rstate->high_tail) {
rstate->high_tail = node->group_prev;
}
cgdebug_printf("Moving...%d to low\n", node - rstate->lr);
node->group_prev = rstate->low_tail;
node->group_next = 0;
*rstate->low_tail = node;
rstate->low_tail = &node->group_next;
if (*node->group_prev != node) {
internal_error(state, 0, "move2: *prev != node?");
}
}
node->degree -= 1;
}
color_graph(state, rstate);
cgdebug_printf("Coloring %d @%s:%d.%d:",
range - rstate->lr,
range->def->filename, range->def->line, range->def->col);
cgdebug_flush();
select_free_color(state, rstate, range);
if (range->color == -1) {
internal_error(state, range->def, "select_free_color did not?");
}
cgdebug_printf(" %s\n", arch_reg_str(range->color));
}
static void color_triples(struct compile_state *state, struct reg_state *rstate)
{
struct live_range *lr;
struct triple *first, *triple;
first = state->main_function->left;
triple = first;
do {
if ((triple->id < 0) || (triple->id > rstate->ranges)) {
internal_error(state, triple,
"triple without a live range");
}
lr = &rstate->lr[triple->id];
triple->id = MK_REG_ID(lr->color, 0);
triple = triple->next;
} while (triple != first);
}
static void print_interference_block(
struct compile_state *state, struct block *block, void *arg)
{
struct reg_state *rstate = arg;
struct reg_block *rb;
struct triple *ptr;
int phi_present;
int done;
rb = &rstate->blocks[block->vertex];
printf("\nblock: %p (%d), %p<-%p %p<-%p\n",
block,
block->vertex,
block->left,
block->left && block->left->use?block->left->use->member : 0,
block->right,
block->right && block->right->use?block->right->use->member : 0);
if (rb->in) {
struct triple_reg_set *in_set;
printf(" in:");
for(in_set = rb->in; in_set; in_set = in_set->next) {
printf(" %-10p", in_set->member);
}
printf("\n");
}
phi_present = 0;
for(done = 0, ptr = block->first; !done; ptr = ptr->next) {
done = (ptr == block->last);
if (ptr->op == OP_PHI) {
phi_present = 1;
break;
}
}
if (phi_present) {
int edge;
for(edge = 0; edge < block->users; edge++) {
printf(" in(%d):", edge);
for(done = 0, ptr = block->first; !done; ptr = ptr->next) {
struct triple **slot;
done = (ptr == block->last);
if (ptr->op != OP_PHI) {
continue;
}
slot = (struct triple **)(ptr->left);
printf(" %-10p", slot[edge]);
}
printf("\n");
}
}
if (block->first->op == OP_LABEL) {
printf("%p:\n", block->first);
}
for(done = 0, ptr = block->first; !done; ptr = ptr->next) {
struct triple_set *user;
struct live_range *lr;
int op;
op = ptr->op;
done = (ptr == block->last);
lr = &rstate->lr[ptr->id];
if (!IS_CONST_OP(op)) {
if (ptr->u.block != block) {
internal_error(state, ptr,
"Wrong block pointer: %p",
ptr->u.block);
}
}
if (op == OP_ADECL) {
for(user = ptr->use; user; user = user->next) {
struct live_range *lr;
lr = &rstate->lr[user->member->id];
if (!user->member->u.block) {
internal_error(state, user->member,
"Use %p not in a block?",
user->member);
}
}
}
if (op == OP_INTCONST) {
printf("(%p) %3d %-7s %08lx @ %s:%d.%d\n",
ptr, lr->color, tops(ptr->op), ptr->u.cval,
ptr->filename, ptr->line, ptr->col);
}
else if (op == OP_PHI) {
struct triple **slot;
struct block *block;
int edge;
block = ptr->u.block;
slot = (struct triple **)(ptr->left);
printf("(%p) %3d %-7s",
ptr, lr->color, tops(ptr->op));
for(edge = 0; edge < block->users; edge++) {
printf(" %-10p", slot[edge]);
}
printf(" @%s:%d.%d\n",
ptr->filename, ptr->line, ptr->col);
}
else {
printf("(%p) %3d %-7s %-10p %-10p @ %s:%d.%d\n",
ptr, lr->color, tops(ptr->op), ptr->left, ptr->right,
ptr->filename, ptr->line, ptr->col);
}
if (lr->edges > 0) {
struct live_range_edge *edge;
printf(" ");
for(edge = lr->edges; edge; edge = edge->next) {
printf(" %-10p", edge->node->def);
}
printf("\n");
}
/* Do a bunch of sanity checks */
valid_op(state, ptr);
if ((ptr->id < 0) || (ptr->id > rstate->ranges)) {
internal_error(state, ptr, "Invalid triple id: %d",
ptr->id);
}
for(user = ptr->use; user; user = user->next) {
struct triple *use;
struct live_range *ulr;
use = user->member;
valid_op(state, use);
if ((use->id < 0) || (use->id > rstate->ranges)) {
internal_error(state, use, "Invalid triple id: %d",
use->id);
}
ulr = &rstate->lr[user->member->id];
if (!IS_CONST_OP(user->member->op) &&
!user->member->u.block) {
internal_error(state, user->member,
"Use %p not in a block?",
user->member);
}
}
}
if (rb->out) {
struct triple_reg_set *out_set;
printf(" out:");
for(out_set = rb->out; out_set; out_set = out_set->next) {
printf(" %-10p", out_set->member);
}
printf("\n");
}
printf("\n");
}
static struct live_range *merge_sort_lr(
struct live_range *first, struct live_range *last)
{
struct live_range *mid, *join, **join_tail, *pick;
size_t size;
size = (last - first) + 1;
if (size >= 2) {
mid = first + size/2;
first = merge_sort_lr(first, mid -1);
mid = merge_sort_lr(mid, last);
join = 0;
join_tail = &join;
/* merge the two lists */
while(first && mid) {
if (first->degree <= mid->degree) {
pick = first;
first = first->group_next;
if (first) {
first->group_prev = 0;
}
}
else {
pick = mid;
mid = mid->group_next;
if (mid) {
mid->group_prev = 0;
}
}
pick->group_next = 0;
pick->group_prev = join_tail;
*join_tail = pick;
join_tail = &pick->group_next;
}
/* Splice the remaining list */
pick = (first)? first : mid;
*join_tail = pick;
pick->group_prev = join_tail;
}
else {
if (!first->def) {
first = 0;
}
join = first;
}
return join;
}
static void allocate_registers(struct compile_state *state)
{
struct reg_state rstate;
struct live_range **point, **next;
int i;
/* Clear out the reg_state */
memset(&rstate, 0, sizeof(rstate));
/* Compute the variable lifetimes */
rstate.blocks = compute_variable_lifetimes(state);
/* Allocate and initialize the live ranges */
initialize_live_ranges(state, &rstate);
/* Compute the interference graph */
walk_variable_lifetimes(
state, rstate.blocks, graph_ins, &rstate);
/* Display the interference graph if desired */
if (state->debug & DEBUG_INTERFERENCE) {
printf("\nlive variables by block\n");
walk_blocks(state, print_interference_block, &rstate);
printf("\nlive variables by instruction\n");
walk_variable_lifetimes(
state, rstate.blocks,
print_interference_ins, &rstate);
}
/* Do not perform coalescing! It is a neat idea but it limits what
* we can do later. It has no benefits that decrease register pressure.
* It only decreases instruction count.
*
* It might be worth testing this reducing the number of
* live_ragnes as opposed to splitting them seems to help.
*/
/* Build the groups low and high. But with the nodes
* first sorted by degree order.
*/
rstate.low_tail = &rstate.low;
rstate.high_tail = &rstate.high;
rstate.high = merge_sort_lr(&rstate.lr[1], &rstate.lr[rstate.ranges]);
rstate.high->group_prev = &rstate.high;
for(point = &rstate.high; *point; point = &(*point)->group_next)
;
rstate.high_tail = point;
/* Walk through the high list and move everything that needs
* to be onto low.
*/
for(point = &rstate.high; *point; point = next) {
struct live_range *range;
next = &(*point)->group_next;
range = *point;
/* If it has a low degree or it already has a color
* place the node in low.
*/
if ((range->degree < regc_max_size(state, range->classes)) ||
(range->color != REG_UNSET)) {
cgdebug_printf("Lo: %5d degree %5d%s\n",
range - rstate.lr, range->degree,
(range->color != REG_UNSET) ? " (colored)": "");
*range->group_prev = range->group_next;
if (range->group_next) {
range->group_next->group_prev = range->group_prev;
}
if (&range->group_next == rstate.high_tail) {
rstate.high_tail = range->group_prev;
}
range->group_prev = rstate.low_tail;
range->group_next = 0;
*rstate.low_tail = range;
rstate.low_tail = &range->group_next;
next = point;
}
else {
cgdebug_printf("hi: %5d degree %5d%s\n",
range - rstate.lr, range->degree,
(range->color != REG_UNSET) ? " (colored)": "");
}
}
/* Color the live_ranges */
color_graph(state, &rstate);
/* Move the colors from the graph to the triples */
color_triples(state, &rstate);
/* Free the edges on each node */
for(i = 1; i <= rstate.ranges; i++) {
remove_live_edges(&rstate, &rstate.lr[i]);
}
xfree(rstate.lr);
/* Free the variable lifetime information */
free_variable_lifetimes(state, rstate.blocks);
}
/* Sparce Conditional Constant Propogation
* =========================================
*/
struct ssa_edge;
struct flow_block;
struct lattice_node {
struct triple *def;
struct ssa_edge *out;
struct flow_block *fblock;
struct triple *val;
/* lattice high val && !is_const(val)
* lattice const is_const(val)
* lattice low val == 0
*/
struct triple scratch;
};
struct ssa_edge {
struct lattice_node *src;
struct lattice_node *dst;
struct ssa_edge *work_next;
struct ssa_edge *work_prev;
struct ssa_edge *out_next;
};
struct flow_edge {
struct flow_block *src;
struct flow_block *dst;
struct flow_edge *work_next;
struct flow_edge *work_prev;
struct flow_edge *in_next;
struct flow_edge *out_next;
int executable;
};
struct flow_block {
struct block *block;
struct flow_edge *in;
struct flow_edge *out;
struct flow_edge left, right;
};
struct scc_state {
struct lattice_node *lattice;
struct ssa_edge *ssa_edges;
struct flow_block *flow_blocks;
struct flow_edge *flow_work_list;
struct ssa_edge *ssa_work_list;
};
static void scc_add_fedge(struct compile_state *state, struct scc_state *scc,
struct flow_edge *fedge)
{
if (!scc->flow_work_list) {
scc->flow_work_list = fedge;
fedge->work_next = fedge->work_prev = fedge;
}
else {
struct flow_edge *ftail;
ftail = scc->flow_work_list->work_prev;
fedge->work_next = ftail->work_next;
fedge->work_prev = ftail;
fedge->work_next->work_prev = fedge;
fedge->work_prev->work_next = fedge;
}
}
static struct flow_edge *scc_next_fedge(
struct compile_state *state, struct scc_state *scc)
{
struct flow_edge *fedge;
fedge = scc->flow_work_list;
if (fedge) {
fedge->work_next->work_prev = fedge->work_prev;
fedge->work_prev->work_next = fedge->work_next;
if (fedge->work_next != fedge) {
scc->flow_work_list = fedge->work_next;
} else {
scc->flow_work_list = 0;
}
}
return fedge;
}
static void scc_add_sedge(struct compile_state *state, struct scc_state *scc,
struct ssa_edge *sedge)
{
if (!scc->ssa_work_list) {
scc->ssa_work_list = sedge;
sedge->work_next = sedge->work_prev = sedge;
}
else {
struct ssa_edge *stail;
stail = scc->ssa_work_list->work_prev;
sedge->work_next = stail->work_next;
sedge->work_prev = stail;
sedge->work_next->work_prev = sedge;
sedge->work_prev->work_next = sedge;
}
}
static struct ssa_edge *scc_next_sedge(
struct compile_state *state, struct scc_state *scc)
{
struct ssa_edge *sedge;
sedge = scc->ssa_work_list;
if (sedge) {
sedge->work_next->work_prev = sedge->work_prev;
sedge->work_prev->work_next = sedge->work_next;
if (sedge->work_next != sedge) {
scc->ssa_work_list = sedge->work_next;
} else {
scc->ssa_work_list = 0;
}
}
return sedge;
}
static void initialize_scc_state(
struct compile_state *state, struct scc_state *scc)
{
int ins_count, ssa_edge_count;
int ins_index, ssa_edge_index, fblock_index;
struct triple *first, *ins;
struct block *block;
struct flow_block *fblock;
memset(scc, 0, sizeof(*scc));
/* Inialize pass zero find out how much memory we need */
first = state->main_function->left;
ins = first;
ins_count = ssa_edge_count = 0;
do {
struct triple_set *edge;
ins_count += 1;
for(edge = ins->use; edge; edge = edge->next) {
ssa_edge_count++;
}
ins = ins->next;
} while(ins != first);
#if DEBUG_SCC
fprintf(stderr, "ins_count: %d ssa_edge_count: %d vertex_count: %d\n",
ins_count, ssa_edge_count, state->last_vertex);
#endif
scc->lattice =
xcmalloc(sizeof(*scc->lattice)*(ins_count + 1), "lattice");
scc->ssa_edges =
xcmalloc(sizeof(*scc->ssa_edges)*(ssa_edge_count + 1), "ssa_edges");
scc->flow_blocks =
xcmalloc(sizeof(*scc->flow_blocks)*(state->last_vertex + 1),
"flow_blocks");
/* Initialize pass one collect up the nodes */
fblock = 0;
block = 0;
ins_index = ssa_edge_index = fblock_index = 0;
ins = first;
do {
ins->id = 0;
if ((ins->op == OP_LABEL) && (block != ins->u.block)) {
block = ins->u.block;
if (!block) {
internal_error(state, ins, "label without block");
}
fblock_index += 1;
block->vertex = fblock_index;
fblock = &scc->flow_blocks[fblock_index];
fblock->block = block;
}
{
struct lattice_node *lnode;
ins_index += 1;
ins->id = ins_index;
lnode = &scc->lattice[ins_index];
lnode->def = ins;
lnode->out = 0;
lnode->fblock = fblock;
lnode->val = ins; /* LATTICE HIGH */
}
ins = ins->next;
} while(ins != first);
/* Initialize pass two collect up the edges */
block = 0;
fblock = 0;
ins = first;
do {
if ((ins->op == OP_LABEL) && (block != ins->u.block)) {
struct flow_edge *fedge, **ftail;
struct block_set *bedge;
block = ins->u.block;
fblock = &scc->flow_blocks[block->vertex];
fblock->in = 0;
fblock->out = 0;
ftail = &fblock->out;
if (block->left) {
fblock->left.dst = &scc->flow_blocks[block->left->vertex];
if (fblock->left.dst->block != block->left) {
internal_error(state, 0, "block mismatch");
}
fblock->left.out_next = 0;
*ftail = &fblock->left;
ftail = &fblock->left.out_next;
}
if (block->right) {
fblock->right.dst = &scc->flow_blocks[block->right->vertex];
if (fblock->right.dst->block != block->right) {
internal_error(state, 0, "block mismatch");
}
fblock->right.out_next = 0;
*ftail = &fblock->right;
ftail = &fblock->right.out_next;
}
for(fedge = fblock->out; fedge; fedge = fedge->out_next) {
fedge->src = fblock;
fedge->work_next = fedge->work_prev = fedge;
fedge->executable = 0;
}
ftail = &fblock->in;
for(bedge = block->use; bedge; bedge = bedge->next) {
struct block *src_block;
struct flow_block *sfblock;
struct flow_edge *sfedge;
src_block = bedge->member;
sfblock = &scc->flow_blocks[src_block->vertex];
sfedge = 0;
if (src_block->left == block) {
sfedge = &sfblock->left;
} else {
sfedge = &sfblock->right;
}
*ftail = sfedge;
ftail = &sfedge->in_next;
sfedge->in_next = 0;
}
}
{
struct triple_set *edge;
struct ssa_edge **stail;
struct lattice_node *lnode;
lnode = &scc->lattice[ins->id];
lnode->out = 0;
stail = &lnode->out;
for(edge = ins->use; edge; edge = edge->next) {
struct ssa_edge *sedge;
ssa_edge_index += 1;
sedge = &scc->ssa_edges[ssa_edge_index];
*stail = sedge;
stail = &sedge->out_next;
sedge->src = lnode;
sedge->dst = &scc->lattice[edge->member->id];
sedge->work_next = sedge->work_prev = sedge;
sedge->out_next = 0;
}
}
ins = ins->next;
} while(ins != first);
/* Setup a dummy block 0 as a node above the start node */
{
struct flow_block *fblock, *dst;
struct flow_edge *fedge;
fblock = &scc->flow_blocks[0];
fblock->block = 0;
fblock->in = 0;
fblock->out = &fblock->left;
dst = &scc->flow_blocks[state->first_block->vertex];
fedge = &fblock->left;
fedge->src = fblock;
fedge->dst = dst;
fedge->work_next = fedge;
fedge->work_prev = fedge;
fedge->in_next = fedge->dst->in;
fedge->out_next = 0;
fedge->executable = 0;
fedge->dst->in = fedge;
/* Initialize the work lists */
scc->flow_work_list = 0;
scc->ssa_work_list = 0;
scc_add_fedge(state, scc, fedge);
}
#if DEBUG_SCC
fprintf(stderr, "ins_index: %d ssa_edge_index: %d fblock_index: %d\n",
ins_index, ssa_edge_index, fblock_index);
#endif
}
static void free_scc_state(
struct compile_state *state, struct scc_state *scc)
{
xfree(scc->flow_blocks);
xfree(scc->ssa_edges);
xfree(scc->lattice);
}
static struct lattice_node *triple_to_lattice(
struct compile_state *state, struct scc_state *scc, struct triple *ins)
{
if (ins->id <= 0) {
internal_error(state, ins, "bad id");
}
return &scc->lattice[ins->id];
}
static void scc_visit_phi(struct compile_state *state, struct scc_state *scc,
struct lattice_node *lnode)
{
struct lattice_node *tmp;
struct triple **slot;
struct flow_edge *fedge;
int index;
if (lnode->def->op != OP_PHI) {
internal_error(state, lnode->def, "not phi");
}
/* default to lattice high */
lnode->val = lnode->def;
slot = (struct triple **)lnode->def->left;
index = 0;
for(fedge = lnode->fblock->in; fedge; index++, fedge = fedge->in_next) {
if (!fedge->executable) {
continue;
}
if (!slot[index]) {
internal_error(state, lnode->def, "no phi value");
}
tmp = triple_to_lattice(state, scc, slot[index]);
/* meet(X, lattice low) = lattice low */
if (!tmp->val) {
lnode->val = 0;
}
/* meet(X, lattice high) = X */
else if (!tmp->val) {
lnode->val = lnode->val;
}
/* meet(lattice high, X) = X */
else if (!is_const(lnode->val)) {
lnode->val = tmp->val;
}
/* meet(const, const) = const or lattice low */
else if (!constants_equal(state, lnode->val, tmp->val)) {
lnode->val = 0;
}
if (!lnode->val) {
break;
}
}
/* Do I need to update any work lists here? */
#if DEBUG_SCC
fprintf(stderr, "phi: %d -> %s\n",
lnode->def->id,
(!lnode->val)? "lo": is_const(lnode->val)? "const": "hi");
#endif
}
static int compute_lnode_val(struct compile_state *state, struct scc_state *scc,
struct lattice_node *lnode)
{
int changed;
struct triple old_buf, *old;
struct triple **dexpr, **vexpr;
/* Store the original value */
if (lnode->val) {
old = &old_buf;
memcpy(old, lnode->val, sizeof(*old));
} else {
old = 0;
}
/* Reinitialize the value */
memset(&lnode->scratch, 0, sizeof(lnode->scratch));
lnode->val = &lnode->scratch;
lnode->val->next = &lnode->scratch;
lnode->val->prev = &lnode->scratch;
lnode->val->use = 0;
lnode->val->type = lnode->def->type;
lnode->val->op = lnode->def->op;
lnode->val->left = 0;
lnode->val->right = 0;
lnode->val->filename = lnode->def->filename;
lnode->val->line = lnode->def->line;
lnode->val->col = lnode->def->col;
if (lnode->def->op != OP_STORE) {
check_lhs(state, lnode->def);
}
dexpr = triple_rhs(state, lnode->def, 0);
vexpr = triple_rhs(state, lnode->val, 0);
while(dexpr && vexpr) {
struct lattice_node *tmp;
tmp = triple_to_lattice(state, scc, *dexpr);
*vexpr = (tmp->val)? tmp->val : tmp->def;
dexpr = triple_rhs(state, lnode->def, dexpr);
vexpr = triple_rhs(state, lnode->val, vexpr);
}
if (is_const(lnode->val)) {
memcpy(&lnode->val->u, &lnode->def->u, sizeof(lnode->def->u));
}
else if (lnode->val->op == OP_BRANCH) {
lnode->val->left = lnode->def->left;
lnode->val->next = lnode->def->next;
}
else if (lnode->val->op == OP_SDECL) {
lnode->val->left = lnode->def->left;
}
/* Recompute the value */
#warning "FIXME see if simplify does anything bad"
/* So far it looks like only the strength reduction
* optimization are things I need to worry about.
*/
simplify(state, lnode->val);
/* Cleanup my value */
if (lnode->scratch.use) {
internal_error(state, lnode->def, "scratch used?");
}
if ((lnode->scratch.prev != &lnode->scratch) ||
((lnode->scratch.next != &lnode->scratch) &&
((lnode->def->op != OP_BRANCH) ||
(lnode->scratch.next != lnode->def->next)))) {
internal_error(state, lnode->def, "scratch in list?");
}
/* undo any uses... */
vexpr = triple_rhs(state, lnode->val, 0);
for(;vexpr;vexpr = triple_rhs(state, lnode->val, vexpr)) {
unuse_triple(*vexpr, lnode->val);
}
if (!is_const(lnode->val)) {
dexpr = triple_rhs(state, lnode->def, 0);
for(;dexpr;dexpr = triple_rhs(state, lnode->def, dexpr)) {
struct lattice_node *tmp;
tmp = triple_to_lattice(state, scc, *dexpr);
if (!tmp->val) {
lnode->val = 0;
}
}
}
if (lnode->val &&
(lnode->val->op == lnode->def->op) &&
(lnode->val->left == lnode->def->left) &&
(lnode->val->right == lnode->def->right) &&
(((memcmp(&lnode->val->u, &lnode->def->u, sizeof(lnode->def->u)) == 0) &&
is_const(lnode->val)) || !is_const(lnode->val))) {
lnode->val = lnode->def;
}
/* Find the cases that are always lattice lo */
if (lnode->val &&
triple_is_def(lnode->val) &&
!triple_is_pure(state, lnode->val)) {
lnode->val = 0;
}
#if 1
if (lnode->val &&
(lnode->val->op == OP_SDECL) &&
(lnode->val != lnode->def)) {
internal_error(state, lnode->def, "bad sdecl");
}
#endif
/* See if the lattice value has changed */
changed = 1;
if (!old && !lnode->val) {
changed = 0;
}
if (changed && lnode->val && !is_const(lnode->val)) {
changed = 0;
}
if (changed &&
lnode->val && old &&
(lnode->val->op == old->op) &&
(lnode->val->left == old->left) &&
(lnode->val->right == old->right) &&
(memcmp(&lnode->val->u, &old->u, sizeof(old->u)) == 0)) {
changed = 0;
}
return changed;
}
static void scc_visit_branch(struct compile_state *state, struct scc_state *scc,
struct lattice_node *lnode)
{
struct lattice_node *cond;
#if DEBUG_SCC
{
struct flow_edge *fedge;
fprintf(stderr, "branch: %d (",
lnode->def->id);
for(fedge = lnode->fblock->out; fedge; fedge = fedge->out_next) {
fprintf(stderr, " %d", fedge->dst->block->vertex);
}
fprintf(stderr, " )");
if (lnode->def->right) {
fprintf(stderr, " <- %d",
lnode->def->right->id);
}
fprintf(stderr, "\n");
}
#endif
if (lnode->def->op != OP_BRANCH) {
internal_error(state, lnode->def, "not branch");
}
/* This only applies to conditional branches */
if (lnode->def->right == 0) {
return;
}
cond = triple_to_lattice(state, scc, lnode->def->right);
if (cond->val && !is_const(cond->val)) {
#warning "FIXME do I need to do something here?"
warning(state, cond->def, "condition not constant?");
return;
}
if (cond->val == 0) {
scc_add_fedge(state, scc, cond->fblock->out);
scc_add_fedge(state, scc, cond->fblock->out->out_next);
}
else if (cond->val->u.cval) {
scc_add_fedge(state, scc, cond->fblock->out->out_next);
} else {
scc_add_fedge(state, scc, cond->fblock->out);
}
}
static void scc_visit_expr(struct compile_state *state, struct scc_state *scc,
struct lattice_node *lnode)
{
int changed;
changed = compute_lnode_val(state, scc, lnode);
#if DEBUG_SCC
{
struct triple **expr;
fprintf(stderr, "expr: %3d %10s (",
lnode->def->id, tops(lnode->def->op));
expr = triple_rhs(state, lnode->def, 0);
for(;expr;expr = triple_rhs(state, lnode->def, expr)) {
fprintf(stderr, " %d", (*expr)->id);
}
fprintf(stderr, " ) -> %s\n",
(!lnode->val)? "lo": is_const(lnode->val)? "const": "hi");
}
#endif
if (lnode->def->op == OP_BRANCH) {
scc_visit_branch(state, scc, lnode);
}
else if (changed) {
struct ssa_edge *sedge;
for(sedge = lnode->out; sedge; sedge = sedge->out_next) {
scc_add_sedge(state, scc, sedge);
}
}
}
static void scc_writeback_values(
struct compile_state *state, struct scc_state *scc)
{
struct triple *first, *ins;
first = state->main_function->left;
ins = first;
do {
struct lattice_node *lnode;
lnode = triple_to_lattice(state, scc, ins);
#if DEBUG_SCC
if (lnode->val && !is_const(lnode->val)) {
warning(state, lnode->def,
"lattice node still high?");
}
#endif
if (lnode->val && (lnode->val != ins)) {
/* See if it something I know how to write back */
switch(lnode->val->op) {
case OP_INTCONST:
mkconst(state, ins, lnode->val->u.cval);
break;
case OP_ADDRCONST:
mkaddr_const(state, ins,
lnode->val->left, lnode->val->u.cval);
break;
default:
/* By default don't copy the changes,
* recompute them in place instead.
*/
simplify(state, ins);
break;
}
}
ins = ins->next;
} while(ins != first);
}
static void scc_transform(struct compile_state *state)
{
struct scc_state scc;
initialize_scc_state(state, &scc);
while(scc.flow_work_list || scc.ssa_work_list) {
struct flow_edge *fedge;
struct ssa_edge *sedge;
struct flow_edge *fptr;
while((fedge = scc_next_fedge(state, &scc))) {
struct block *block;
struct triple *ptr;
struct flow_block *fblock;
int time;
int done;
if (fedge->executable) {
continue;
}
if (!fedge->dst) {
internal_error(state, 0, "fedge without dst");
}
if (!fedge->src) {
internal_error(state, 0, "fedge without src");
}
fedge->executable = 1;
fblock = fedge->dst;
block = fblock->block;
time = 0;
for(fptr = fblock->in; fptr; fptr = fptr->in_next) {
if (fptr->executable) {
time++;
}
}
#if DEBUG_SCC
fprintf(stderr, "vertex: %d time: %d\n",
block->vertex, time);
#endif
done = 0;
for(ptr = block->first; !done; ptr = ptr->next) {
struct lattice_node *lnode;
done = (ptr == block->last);
lnode = &scc.lattice[ptr->id];
if (ptr->op == OP_PHI) {
scc_visit_phi(state, &scc, lnode);
}
else if (time == 1) {
scc_visit_expr(state, &scc, lnode);
}
}
if (fblock->out && !fblock->out->out_next) {
scc_add_fedge(state, &scc, fblock->out);
}
}
while((sedge = scc_next_sedge(state, &scc))) {
struct lattice_node *lnode;
struct flow_block *fblock;
lnode = sedge->dst;
fblock = lnode->fblock;
#if DEBUG_SCC
fprintf(stderr, "sedge: %5d (%5d -> %5d)\n",
sedge - scc.ssa_edges,
sedge->src->def->id,
sedge->dst->def->id);
#endif
if (lnode->def->op == OP_PHI) {
scc_visit_phi(state, &scc, lnode);
}
else {
for(fptr = fblock->in; fptr; fptr = fptr->in_next) {
if (fptr->executable) {
break;
}
}
if (fptr) {
scc_visit_expr(state, &scc, lnode);
}
}
}
}
scc_writeback_values(state, &scc);
/* FINISH ME move constants from scratch values into the tree */
free_scc_state(state, &scc);
}
static void transform_to_arch_instructions(struct compile_state *state);
static void optimize(struct compile_state *state)
{
if (state->debug & DEBUG_TRIPLES) {
print_triples(state);
}
/* Analize the intermediate code */
setup_basic_blocks(state);
analyze_idominators(state);
analyze_ipdominators(state);
/* Transform the code to ssa form */
transform_to_ssa_form(state);
/* Do strength reduction and simple constant optimizations */
if (state->optimize >= 1) {
simplify_all(state);
}
/* Propogate constants throughout the code */
if (state->optimize >= 2) {
scc_transform(state);
transform_from_ssa_form(state);
free_basic_blocks(state);
setup_basic_blocks(state);
analyze_idominators(state);
analyze_ipdominators(state);
transform_to_ssa_form(state);
}
#warning "WISHLIST implement single use constants (least possible register pressure)"
#warning "WISHLIST implement induction variable elimination"
#warning "WISHLIST implement strength reduction"
/* Select architecture instructions and an initial partial
* coloring based on architecture constraints.
*/
transform_to_arch_instructions(state);
if (state->debug & DEBUG_ARCH_CODE) {
printf("After transform_to_arch_instructions\n");
print_blocks(state);
print_control_flow(state);
}
eliminate_inefectual_code(state);
if (state->debug & DEBUG_CODE_ELIMINATION) {
printf("After eliminate_inefectual_code\n");
print_blocks(state);
print_control_flow(state);
}
/* Color all of the variables to see if they will fit in registers */
insert_copies_to_phi(state);
allocate_registers(state);
if (state->debug & DEBUG_INTERMEDIATE_CODE) {
print_blocks(state);
}
if (state->debug & DEBUG_CONTROL_FLOW) {
print_control_flow(state);
}
/* Remove the optimization information.
* This is more to check for memory consistency than to free memory.
*/
free_basic_blocks(state);
}
/* The x86 register classes */
#define REGC_FLAGS 0
#define REGC_GPR8 1
#define REGC_GPR16 2
#define REGC_GPR32 3
#define REGC_GPR64 4
#define REGC_MMX 5
#define REGC_XMM 6
#define REGC_GPR32_8 7
#define REGC_GPR16_8 8
#define LAST_REGC REGC_GPR16_8
#if LAST_REGC >= MAX_REGC
#error "MAX_REGC is to low"
#endif
/* Register class masks */
#define REGCM_FLAGS (1 << REGC_FLAGS)
#define REGCM_GPR8 (1 << REGC_GPR8)
#define REGCM_GPR16 (1 << REGC_GPR16)
#define REGCM_GPR32 (1 << REGC_GPR32)
#define REGCM_GPR64 (1 << REGC_GPR64)
#define REGCM_MMX (1 << REGC_MMX)
#define REGCM_XMM (1 << REGC_XMM)
#define REGCM_GPR32_8 (1 << REGC_GPR32_8)
#define REGCM_GPR16_8 (1 << REGC_GPR16_8)
/* The x86 registers */
#define REG_EFLAGS 1
#define REGC_FLAGS_FIRST REG_EFLAGS
#define REGC_FLAGS_LAST REG_EFLAGS
#define REG_AL 2
#define REG_BL 3
#define REG_CL 4
#define REG_DL 5
#define REG_AH 6
#define REG_BH 7
#define REG_CH 8
#define REG_DH 9
#define REGC_GPR8_FIRST REG_AL
#if X86_4_8BIT_GPRS
#define REGC_GPR8_LAST REG_DL
#else
#define REGC_GPR8_LAST REG_DH
#endif
#define REG_AX 10
#define REG_BX 11
#define REG_CX 12
#define REG_DX 13
#define REG_SI 14
#define REG_DI 15
#define REG_BP 16
#define REG_SP 17
#define REGC_GPR16_FIRST REG_AX
#define REGC_GPR16_LAST REG_SP
#define REG_EAX 18
#define REG_EBX 19
#define REG_ECX 20
#define REG_EDX 21
#define REG_ESI 22
#define REG_EDI 23
#define REG_EBP 24
#define REG_ESP 25
#define REGC_GPR32_FIRST REG_EAX
#define REGC_GPR32_LAST REG_ESP
#define REG_EDXEAX 26
#define REGC_GPR64_FIRST REG_EDXEAX
#define REGC_GPR64_LAST REG_EDXEAX
#define REG_MMX0 27
#define REG_MMX1 28
#define REG_MMX2 29
#define REG_MMX3 30
#define REG_MMX4 31
#define REG_MMX5 32
#define REG_MMX6 33
#define REG_MMX7 34
#define REGC_MMX_FIRST REG_MMX0
#define REGC_MMX_LAST REG_MMX7
#define REG_XMM0 35
#define REG_XMM1 36
#define REG_XMM2 37
#define REG_XMM3 38
#define REG_XMM4 39
#define REG_XMM5 40
#define REG_XMM6 41
#define REG_XMM7 42
#define REGC_XMM_FIRST REG_XMM0
#define REGC_XMM_LAST REG_XMM7
#warning "WISHLIST figure out how to use pinsrw and pextrw to better use extended regs"
#define LAST_REG REG_XMM7
#define REGC_GPR32_8_FIRST REG_EAX
#define REGC_GPR32_8_LAST REG_EDX
#define REGC_GPR16_8_FIRST REG_AX
#define REGC_GPR16_8_LAST REG_DX
#if LAST_REG >= MAX_REGISTERS
#error "MAX_REGISTERS to low"
#endif
static unsigned arch_regc_size(struct compile_state *state, int class)
{
static unsigned regc_size[LAST_REGC +1] = {
[REGC_FLAGS] = REGC_FLAGS_LAST - REGC_FLAGS_FIRST + 1,
[REGC_GPR8] = REGC_GPR8_LAST - REGC_GPR8_FIRST + 1,
[REGC_GPR16] = REGC_GPR16_LAST - REGC_GPR16_FIRST + 1,
[REGC_GPR32] = REGC_GPR32_LAST - REGC_GPR32_FIRST + 1,
[REGC_GPR64] = REGC_GPR64_LAST - REGC_GPR64_FIRST + 1,
[REGC_MMX] = REGC_MMX_LAST - REGC_MMX_FIRST + 1,
[REGC_XMM] = REGC_XMM_LAST - REGC_XMM_FIRST + 1,
[REGC_GPR32_8] = REGC_GPR32_8_LAST - REGC_GPR32_8_FIRST + 1,
[REGC_GPR16_8] = REGC_GPR16_8_LAST - REGC_GPR16_8_FIRST + 1,
};
if ((class < 0) || (class > LAST_REGC)) {
return 0;
}
return regc_size[class];
}
static int arch_regcm_intersect(unsigned regcm1, unsigned regcm2)
{
/* See if two register classes may have overlapping registers */
unsigned gpr_mask = REGCM_GPR8 | REGCM_GPR16_8 | REGCM_GPR16 |
REGCM_GPR32_8 | REGCM_GPR32 | REGCM_GPR64;
return (regcm1 & regcm2) ||
((regcm1 & gpr_mask) && (regcm2 & gpr_mask));
}
static void arch_reg_equivs(
struct compile_state *state, unsigned *equiv, int reg)
{
if ((reg < 0) || (reg > LAST_REG)) {
internal_error(state, 0, "invalid register");
}
*equiv++ = reg;
switch(reg) {
case REG_AL:
case REG_AH:
*equiv++ = REG_AX;
*equiv++ = REG_EAX;
*equiv++ = REG_EDXEAX;
break;
case REG_BL:
case REG_BH:
*equiv++ = REG_BX;
*equiv++ = REG_EBX;
break;
case REG_CL:
case REG_CH:
*equiv++ = REG_CX;
*equiv++ = REG_ECX;
break;
case REG_DL:
case REG_DH:
*equiv++ = REG_DX;
*equiv++ = REG_EDX;
*equiv++ = REG_EDXEAX;
break;
case REG_AX:
*equiv++ = REG_AL;
*equiv++ = REG_AH;
*equiv++ = REG_EAX;
*equiv++ = REG_EDXEAX;
break;
case REG_BX:
*equiv++ = REG_BL;
*equiv++ = REG_BH;
*equiv++ = REG_EBX;
break;
case REG_CX:
*equiv++ = REG_CL;
*equiv++ = REG_CH;
*equiv++ = REG_ECX;
break;
case REG_DX:
*equiv++ = REG_DL;
*equiv++ = REG_DH;
*equiv++ = REG_EDX;
*equiv++ = REG_EDXEAX;
break;
case REG_SI:
*equiv++ = REG_ESI;
break;
case REG_DI:
*equiv++ = REG_EDI;
break;
case REG_BP:
*equiv++ = REG_EBP;
break;
case REG_SP:
*equiv++ = REG_ESP;
break;
case REG_EAX:
*equiv++ = REG_AL;
*equiv++ = REG_AH;
*equiv++ = REG_AX;
*equiv++ = REG_EDXEAX;
break;
case REG_EBX:
*equiv++ = REG_BL;
*equiv++ = REG_BH;
*equiv++ = REG_BX;
break;
case REG_ECX:
*equiv++ = REG_CL;
*equiv++ = REG_CH;
*equiv++ = REG_CX;
break;
case REG_EDX:
*equiv++ = REG_DL;
*equiv++ = REG_DH;
*equiv++ = REG_DX;
*equiv++ = REG_EDXEAX;
break;
case REG_ESI:
*equiv++ = REG_SI;
break;
case REG_EDI:
*equiv++ = REG_DI;
break;
case REG_EBP:
*equiv++ = REG_BP;
break;
case REG_ESP:
*equiv++ = REG_SP;
break;
case REG_EDXEAX:
*equiv++ = REG_AL;
*equiv++ = REG_AH;
*equiv++ = REG_DL;
*equiv++ = REG_DH;
*equiv++ = REG_AX;
*equiv++ = REG_DX;
*equiv++ = REG_EAX;
*equiv++ = REG_EDX;
break;
}
*equiv++ = REG_UNSET;
}
static unsigned arch_reg_regcm(struct compile_state *state, int reg)
{
static const struct {
int first, last;
} bound[LAST_REGC + 1] = {
[REGC_FLAGS] = { REGC_FLAGS_FIRST, REGC_FLAGS_LAST },
[REGC_GPR8] = { REGC_GPR8_FIRST, REGC_GPR8_LAST },
[REGC_GPR16] = { REGC_GPR16_FIRST, REGC_GPR16_LAST },
[REGC_GPR32] = { REGC_GPR32_FIRST, REGC_GPR32_LAST },
[REGC_GPR64] = { REGC_GPR64_FIRST, REGC_GPR64_LAST },
[REGC_MMX] = { REGC_MMX_FIRST, REGC_MMX_LAST },
[REGC_XMM] = { REGC_XMM_FIRST, REGC_XMM_LAST },
[REGC_GPR32_8] = { REGC_GPR32_8_FIRST, REGC_GPR32_8_LAST },
[REGC_GPR16_8] = { REGC_GPR16_8_FIRST, REGC_GPR16_8_LAST },
};
unsigned mask;
int class;
mask = 0;
for(class = 0; class <= LAST_REGC; class++) {
if ((reg >= bound[class].first) &&
(reg <= bound[class].last)) {
mask |= (1 << class);
}
}
if (!mask) {
internal_error(state, 0, "reg %d not in any class", reg);
}
return mask;
}
static int do_select_reg(struct compile_state *state,
char *used, int reg, unsigned classes)
{
unsigned mask;
if (used[reg]) {
return REG_UNSET;
}
mask = arch_reg_regcm(state, reg);
return (classes & mask) ? reg : REG_UNSET;
}
static int arch_select_free_register(
struct compile_state *state, char *used, int classes)
{
/* Preference: flags, 8bit gprs, 32bit gprs, other 32bit reg
* other types of registers.
*/
int i, reg;
reg = REG_UNSET;
for(i = REGC_FLAGS_FIRST; (reg == REG_UNSET) && (i <= REGC_FLAGS_LAST); i++) {
reg = do_select_reg(state, used, i, classes);
}
for(i = REGC_GPR8_FIRST; (reg == REG_UNSET) && (i <= REGC_GPR8_LAST); i++) {
reg = do_select_reg(state, used, i, classes);
}
for(i = REGC_GPR32_FIRST; (reg == REG_UNSET) && (i <= REGC_GPR32_LAST); i++) {
reg = do_select_reg(state, used, i, classes);
}
for(i = REGC_MMX_FIRST; (reg == REG_UNSET) && (i <= REGC_MMX_LAST); i++) {
reg = do_select_reg(state, used, i, classes);
}
for(i = REGC_XMM_FIRST; (reg == REG_UNSET) && (i <= REGC_XMM_LAST); i++) {
reg = do_select_reg(state, used, i, classes);
}
for(i = REGC_GPR16_FIRST; (reg == REG_UNSET) && (i <= REGC_GPR16_LAST); i++) {
reg = do_select_reg(state, used, i, classes);
}
for(i = REGC_GPR64_FIRST; (reg == REG_UNSET) && (i <= REGC_GPR64_LAST); i++) {
reg = do_select_reg(state, used, i, classes);
}
return reg;
}
static unsigned arch_type_to_regcm(struct compile_state *state, struct type *type)
{
#warning "FIXME force types smaller (if legal) before I get here"
int use_mmx = 0;
int use_sse = 0;
unsigned avail_mask;
unsigned mask;
avail_mask = REGCM_GPR8 | REGCM_GPR16_8 | REGCM_GPR16 |
REGCM_GPR32 | REGCM_GPR32_8 | REGCM_GPR64;
#if 1
/* Don't enable 8 bit values until I can force both operands
* to be 8bits simultaneously.
*/
avail_mask &= ~(REGCM_GPR8 | REGCM_GPR16_8 | REGCM_GPR16);
#endif
if (use_mmx) {
avail_mask |= REGCM_MMX;
}
if (use_sse) {
avail_mask |= REGCM_XMM;
}
mask = 0;
switch(type->type & TYPE_MASK) {
case TYPE_ARRAY:
case TYPE_VOID:
mask = 0;
break;
case TYPE_CHAR:
case TYPE_UCHAR:
mask = REGCM_GPR8 |
REGCM_GPR16_8 | REGCM_GPR16 |
REGCM_GPR32 | REGCM_GPR32_8 |
REGCM_GPR64 |
REGCM_MMX | REGCM_XMM;
break;
case TYPE_SHORT:
case TYPE_USHORT:
mask = REGCM_GPR16 | REGCM_GPR16_8 |
REGCM_GPR32 | REGCM_GPR32_8 |
REGCM_GPR64 |
REGCM_MMX | REGCM_XMM;
break;
case TYPE_INT:
case TYPE_UINT:
case TYPE_LONG:
case TYPE_ULONG:
case TYPE_POINTER:
mask = REGCM_GPR32 | REGCM_GPR32_8 |
REGCM_GPR64 | REGCM_MMX | REGCM_XMM;
break;
default:
internal_error(state, 0, "no register class for type");
break;
}
mask &= avail_mask;
return mask;
}
static void get_imm32(struct triple *ins, struct triple **expr)
{
struct triple *imm;
if ((*expr)->op != OP_COPY) {
return;
}
imm = (*expr)->left;
while(imm->op == OP_COPY) {
imm = imm->left;
}
if (imm->op != OP_INTCONST) {
return;
}
*expr = imm;
unuse_triple(*expr, ins);
use_triple(*expr, ins);
}
static void get_imm8(struct triple *ins, struct triple **expr)
{
struct triple *imm;
if ((*expr)->op != OP_COPY) {
return;
}
imm = (*expr)->left;
while(imm->op == OP_COPY) {
imm = imm->left;
}
if (imm->op != OP_INTCONST) {
return;
}
/* For imm8 only a sufficienlty small constant can be used */
if (imm->u.cval > 0xff) {
return;
}
*expr = imm;
unuse_triple(*expr, ins);
use_triple(*expr, ins);
}
static struct triple *pre_copy(struct compile_state *state,
struct triple *ins, struct triple **expr,
unsigned reg, unsigned mask)
{
/* Carefully insert enough operations so that I can
* enter any operation with a GPR32.
*/
struct triple *in;
/* See if I can directly reach the result from a GPR32 */
if (mask & (REGCM_GPR32 | REGCM_GPR16 | REGCM_MMX | REGCM_XMM)) {
in = triple(state, OP_COPY, (*expr)->type, *expr, 0);
}
/* If it is a byte value force a earlier copy to a GPR32_8 */
else if (mask & REGCM_GPR8) {
struct triple *tmp;
tmp = triple(state, OP_COPY, (*expr)->type, *expr, 0);
tmp->filename = ins->filename;
tmp->line = ins->line;
tmp->col = ins->col;
tmp->u.block = ins->u.block;
tmp->id = MK_REG_ID(REG_UNSET, REGCM_GPR32_8 | REGCM_GPR16_8);
use_triple(tmp->left, tmp);
insert_triple(state, ins, tmp);
in = triple(state, OP_COPY, tmp->type, tmp, 0);
}
else {
internal_error(state, ins, "bad copy type");
in = 0;
}
in->filename = ins->filename;
in->line = ins->line;
in->col = ins->col;
in->u.block = ins->u.block;
in->id = MK_REG_ID(reg, mask);
unuse_triple(*expr, ins);
*expr = in;
use_triple(in->left, in);
use_triple(in, ins);
insert_triple(state, ins, in);
return in;
}
static struct triple *post_copy(struct compile_state *state, struct triple *ins)
{
struct triple_set *entry, *next;
struct triple *out, *label;
struct block *block;
label = ins;
while(label->op != OP_LABEL) {
label = label->prev;
}
block = label->u.block;
out = triple(state, OP_COPY, ins->type, ins, 0);
out->filename = ins->filename;
out->line = ins->line;
out->col = ins->col;
out->u.block = block;
out->id = MK_REG_ID(REG_UNSET,
arch_type_to_regcm(state, ins->type));
use_triple(ins, out);
insert_triple(state, ins->next, out);
if (block->last == ins) {
block->last = out;
}
/* Get the users of ins to use out instead */
for(entry = ins->use; entry; entry = next) {
next = entry->next;
if (entry->member == out) {
continue;
}
replace_rhs_use(state, ins, out, entry->member);
}
return out;
}
static void fixup_branches(struct compile_state *state,
struct triple *cmp, struct triple *use, int jmp_op)
{
struct triple_set *entry, *next;
for(entry = use->use; entry; entry = next) {
next = entry->next;
if (entry->member->op == OP_COPY) {
fixup_branches(state, cmp, entry->member, jmp_op);
}
else if (entry->member->op == OP_BRANCH) {
struct triple *branch, *test;
branch = entry->member;
test = pre_triple(state, branch,
cmp->op, cmp->type, cmp->left, cmp->right);
test->id = MK_REG_ID(REG_EFLAGS, REGCM_FLAGS);
unuse_triple(branch->right, branch);
branch->right = test;
branch->op = jmp_op;
use_triple(branch->right, branch);
}
}
}
static void bool_cmp(struct compile_state *state,
struct triple *ins, int cmp_op, int jmp_op, int set_op)
{
struct block *block;
struct triple_set *entry, *next;
struct triple *set, *tmp1, *tmp2;
#warning "WISHLIST implement an expression simplifier to reduce the use of set?"
block = ins->u.block;
/* Put a barrier up before the cmp which preceeds the
* copy instruction. If a set actually occurs this gives
* us a chance to move variables in registers out of the way.
*/
/* Modify the comparison operator */
ins->op = cmp_op;
ins->id = MK_REG_ID(REG_EFLAGS, REGCM_FLAGS);
if (cmp_op == OP_CMP) {
get_imm32(ins, &ins->right);
}
/* Generate the instruction sequence that will transform the
* result of the comparison into a logical value.
*/
tmp1 = triple(state, set_op, ins->type, ins, 0);
tmp1->filename = ins->filename;
tmp1->line = ins->line;
tmp1->col = ins->col;
tmp1->u.block = block;
tmp1->id = MK_REG_ID(REG_UNSET, REGCM_GPR8);
use_triple(ins, tmp1);
insert_triple(state, ins->next, tmp1);
tmp2 = triple(state, OP_COPY, ins->type, tmp1, 0);
tmp2->filename = ins->filename;
tmp2->line = ins->line;
tmp2->col = ins->col;
tmp2->u.block = block;
tmp2->id = MK_REG_ID(REG_UNSET,
REGCM_GPR32 | REGCM_GPR32_8 | REGCM_GPR16 | REGCM_GPR16_8 | REGCM_GPR8);
use_triple(tmp1, tmp2);
insert_triple(state, tmp1->next, tmp2);
if (block->last == ins) {
block->last = tmp2;
}
set = tmp2;
for(entry = ins->use; entry; entry = next) {
next = entry->next;
if (entry->member == tmp1) {
continue;
}
replace_rhs_use(state, ins, set, entry->member);
}
fixup_branches(state, ins, set, jmp_op);
}
static void transform_to_arch_instructions(struct compile_state *state)
{
/* Transform from generic 3 address instructions
* to archtecture specific instructions.
* And apply architecture specific constrains to instructions.
* Copies are inserted to preserve the register flexibility
* of 3 address instructions.
*/
struct triple *ins, *first, *next;
struct triple *in, *in2;
first = state->main_function->left;
ins = first;
do {
next = ins->next;
ins->id = MK_REG_ID(REG_UNSET, arch_type_to_regcm(state, ins->type));
switch(ins->op) {
case OP_INTCONST:
case OP_ADDRCONST:
ins->id = 0;
post_copy(state, ins);
break;
case OP_NOOP:
case OP_SDECL:
case OP_BLOBCONST:
case OP_LABEL:
ins->id = 0;
break;
/* instructions that can be used as is */
case OP_COPY:
case OP_PHI:
break;
case OP_STORE:
{
unsigned mask;
ins->id = 0;
switch(ins->type->type & TYPE_MASK) {
case TYPE_CHAR: case TYPE_UCHAR:
mask = REGCM_GPR8;
break;
case TYPE_SHORT: case TYPE_USHORT:
mask = REGCM_GPR16;
break;
case TYPE_INT: case TYPE_UINT:
case TYPE_LONG: case TYPE_ULONG:
case TYPE_POINTER:
mask = REGCM_GPR32;
break;
default:
internal_error(state, ins, "unknown type in store");
mask = 0;
break;
}
in = pre_copy(state, ins, &ins->right, REG_UNSET, mask);
break;
}
case OP_LOAD:
switch(ins->type->type & TYPE_MASK) {
case TYPE_CHAR: case TYPE_UCHAR:
ins->id = MK_REG_ID(REG_UNSET, REGCM_GPR8);
break;
case TYPE_SHORT:
case TYPE_USHORT:
ins->id = MK_REG_ID(REG_UNSET, REGCM_GPR16);
break;
case TYPE_INT:
case TYPE_UINT:
case TYPE_LONG:
case TYPE_ULONG:
case TYPE_POINTER:
ins->id = MK_REG_ID(REG_UNSET, REGCM_GPR32);
break;
default:
internal_error(state, ins, "unknown type in load");
break;
}
break;
case OP_ADD:
case OP_SUB:
case OP_AND:
case OP_XOR:
case OP_OR:
get_imm32(ins, &ins->right);
in = pre_copy(state, ins, &ins->left,
alloc_virtual_reg(), ID_REG_CLASSES(ins->id));
ins->id = in->id;
break;
case OP_SL:
case OP_SSR:
case OP_USR:
get_imm8(ins, &ins->right);
in = pre_copy(state, ins, &ins->left,
alloc_virtual_reg(), ID_REG_CLASSES(ins->id));
ins->id = in->id;
if (!IS_CONST_OP(ins->right->op)) {
in2 = pre_copy(state, ins, &ins->right,
REG_CL, REGCM_GPR8);
}
break;
case OP_INVERT:
case OP_NEG:
in = pre_copy(state, ins, &ins->left,
alloc_virtual_reg(), ID_REG_CLASSES(ins->id));
ins->id = in->id;
break;
case OP_SMUL:
get_imm32(ins, &ins->right);
in = pre_copy(state, ins, &ins->left,
alloc_virtual_reg(), ID_REG_CLASSES(ins->id));
ins->id = in->id;
if (!IS_CONST_OP(ins->right->op)) {
in2 = pre_copy(state, ins, &ins->right,
REG_UNSET, REGCM_GPR32);
}
break;
case OP_EQ:
bool_cmp(state, ins, OP_CMP, OP_JMP_EQ, OP_SET_EQ);
break;
case OP_NOTEQ:
bool_cmp(state, ins, OP_CMP, OP_JMP_NOTEQ, OP_SET_NOTEQ);
break;
case OP_SLESS:
bool_cmp(state, ins, OP_CMP, OP_JMP_SLESS, OP_SET_SLESS);
break;
case OP_ULESS:
bool_cmp(state, ins, OP_CMP, OP_JMP_ULESS, OP_SET_ULESS);
break;
case OP_SMORE:
bool_cmp(state, ins, OP_CMP, OP_JMP_SMORE, OP_SET_SMORE);
break;
case OP_UMORE:
bool_cmp(state, ins, OP_CMP, OP_JMP_UMORE, OP_SET_UMORE);
break;
case OP_SLESSEQ:
bool_cmp(state, ins, OP_CMP, OP_JMP_SLESSEQ, OP_SET_SLESSEQ);
break;
case OP_ULESSEQ:
bool_cmp(state, ins, OP_CMP, OP_JMP_ULESSEQ, OP_SET_ULESSEQ);
break;
case OP_SMOREEQ:
bool_cmp(state, ins, OP_CMP, OP_JMP_SMOREEQ, OP_SET_SMOREEQ);
break;
case OP_UMOREEQ:
bool_cmp(state, ins, OP_CMP, OP_JMP_UMOREEQ, OP_SET_UMOREEQ);
break;
case OP_LTRUE:
bool_cmp(state, ins, OP_TEST, OP_JMP_NOTEQ, OP_SET_NOTEQ);
break;
case OP_LFALSE:
bool_cmp(state, ins, OP_TEST, OP_JMP_EQ, OP_SET_EQ);
break;
case OP_BRANCH:
if (ins->right) {
internal_error(state, ins, "bad branch test");
}
ins->op = OP_JMP;
break;
case OP_INB:
case OP_INW:
case OP_INL:
get_imm8(ins, &ins->left);
switch(ins->op) {
case OP_INB: ins->id = MK_REG_ID(REG_AL, REGCM_GPR8); break;
case OP_INW: ins->id = MK_REG_ID(REG_AX, REGCM_GPR16); break;
case OP_INL: ins->id = MK_REG_ID(REG_EAX, REGCM_GPR32); break;
}
if (!IS_CONST_OP(ins->left->op)) {
in = pre_copy(state, ins, &ins->left,
REG_DX, REGCM_GPR16);
}
break;
case OP_OUTB:
case OP_OUTW:
case OP_OUTL:
{
unsigned reg, mask;
get_imm8(ins, &ins->right);
switch(ins->op) {
case OP_OUTB: reg = REG_AL; mask = REGCM_GPR8; break;
case OP_OUTW: reg = REG_AX; mask = REGCM_GPR16; break;
case OP_OUTL: reg = REG_EAX; mask = REGCM_GPR32; break;
default: reg = REG_UNSET; mask = 0; break;
}
in = pre_copy(state, ins, &ins->left, reg, mask);
if (!IS_CONST_OP(ins->right->op)) {
in2 = pre_copy(state, ins, &ins->right,
REG_DX, REGCM_GPR16);
}
break;
}
case OP_BSF:
case OP_BSR:
in = pre_copy(state, ins, &ins->left,
REG_UNSET, REGCM_GPR32);
ins->id = MK_REG_ID(REG_UNSET, REGCM_GPR32 | REGCM_GPR32_8);
break;
/* Already transformed instructions */
case OP_CMP:
case OP_TEST:
ins->id = MK_REG_ID(REG_EFLAGS, REGCM_FLAGS);
break;
case OP_JMP_EQ: case OP_JMP_NOTEQ:
case OP_JMP_SLESS: case OP_JMP_ULESS:
case OP_JMP_SMORE: case OP_JMP_UMORE:
case OP_JMP_SLESSEQ: case OP_JMP_ULESSEQ:
case OP_JMP_SMOREEQ: case OP_JMP_UMOREEQ:
case OP_SET_EQ: case OP_SET_NOTEQ:
case OP_SET_SLESS: case OP_SET_ULESS:
case OP_SET_SMORE: case OP_SET_UMORE:
case OP_SET_SLESSEQ: case OP_SET_ULESSEQ:
case OP_SET_SMOREEQ: case OP_SET_UMOREEQ:
break;
default:
internal_error(state, ins, "unhandled ins: %d %s\n",
ins->op, tops(ins->op));
break;
}
ins = next;
} while(ins != first);
}
static void generate_local_labels(struct compile_state *state)
{
struct triple *first, *label;
int label_counter;
label_counter = 0;
first = state->main_function->left;
label = first;
do {
if ((label->op == OP_LABEL) ||
(label->op == OP_SDECL)) {
if (label->use) {
label->u.cval = ++label_counter;
} else {
label->u.cval = 0;
}
}
label = label->next;
} while(label != first);
}
static int check_reg(struct compile_state *state,
struct triple *triple, int classes)
{
unsigned mask;
int reg;
reg = ID_REG(triple->id);
if (reg == REG_UNSET) {
internal_error(state, triple, "register not set");
}
if (ID_REG_CLASSES(triple->id)) {
internal_error(state, triple, "class specifier present");
}
mask = arch_reg_regcm(state, reg);
if (!(classes & mask)) {
internal_error(state, triple, "reg %d in wrong class",
reg);
}
return reg;
}
static const char *arch_reg_str(int reg)
{
static const char *regs[] = {
"%bad_register",
"%eflags",
"%al", "%bl", "%cl", "%dl", "%ah", "%bh", "%ch", "%dh",
"%ax", "%bx", "%cx", "%dx", "%si", "%di", "%bp", "%sp",
"%eax", "%ebx", "%ecx", "%edx", "%esi", "%edi", "%ebp", "%esp",
"%edx:%eax",
"%mm0", "%mm1", "%mm2", "%mm3", "%mm4", "%mm5", "%mm6", "%mm7",
"%xmm0", "%xmm1", "%xmm2", "%xmm3",
"%xmm4", "%xmm5", "%xmm6", "%xmm7",
};
if (!((reg >= REG_EFLAGS) && (reg <= REG_XMM7))) {
reg = 0;
}
return regs[reg];
}
static const char *reg(struct compile_state *state, struct triple *triple,
int classes)
{
int reg;
reg = check_reg(state, triple, classes);
return arch_reg_str(reg);
}
const char *type_suffix(struct compile_state *state, struct type *type)
{
const char *suffix;
switch(size_of(state, type)) {
case 1: suffix = "b"; break;
case 2: suffix = "w"; break;
case 4: suffix = "l"; break;
default:
internal_error(state, 0, "unknown suffix");
suffix = 0;
break;
}
return suffix;
}
static void print_binary_op(struct compile_state *state,
const char *op, struct triple *ins, FILE *fp)
{
unsigned mask;
mask = REGCM_GPR32 | REGCM_GPR16 | REGCM_GPR8;
if (ins->left->id != ins->id) {
internal_error(state, ins, "invalid register assignment");
}
if (IS_CONST_OP(ins->right->op)) {
fprintf(fp, "\t%s $%lu, %s\n",
op,
ins->right->u.cval,
reg(state, ins->left, mask));
}
else {
unsigned lmask, rmask;
int lreg, rreg;
lreg = check_reg(state, ins->left, mask);
rreg = check_reg(state, ins->right, mask);
lmask = arch_reg_regcm(state, lreg);
rmask = arch_reg_regcm(state, rreg);
mask = lmask & rmask;
fprintf(fp, "\t%s %s, %s\n",
op,
reg(state, ins->right, mask),
reg(state, ins->left, mask));
}
}
static void print_unary_op(struct compile_state *state,
const char *op, struct triple *ins, FILE *fp)
{
unsigned mask;
mask = REGCM_GPR32 | REGCM_GPR16 | REGCM_GPR8;
fprintf(fp, "\t%s %s\n",
op,
reg(state, ins->left, mask));
}
static void print_op_shift(struct compile_state *state,
const char *op, struct triple *ins, FILE *fp)
{
unsigned mask;
mask = REGCM_GPR32 | REGCM_GPR16 | REGCM_GPR8;
if (ins->left->id != ins->id) {
internal_error(state, ins, "invalid register assignment");
}
if (IS_CONST_OP(ins->right->op)) {
fprintf(fp, "\t%s $%lu, %s\n",
op,
ins->right->u.cval,
reg(state, ins->left, mask));
}
else {
fprintf(fp, "\t%s %s, %s\n",
op,
reg(state, ins->right, REGCM_GPR8),
reg(state, ins->left, mask));
}
}
static void print_op_in(struct compile_state *state, struct triple *ins, FILE *fp)
{
const char *op;
int mask;
int dreg;
mask = 0;
switch(ins->op) {
case OP_INB: op = "inb", mask = REGCM_GPR8; break;
case OP_INW: op = "inw", mask = REGCM_GPR16; break;
case OP_INL: op = "inl", mask = REGCM_GPR32; break;
default:
internal_error(state, ins, "not an in operation");
op = 0;
break;
}
dreg = check_reg(state, ins, mask);
if (!reg_is_reg(state, dreg, REG_EAX)) {
internal_error(state, ins, "dst != %%eax");
}
if (IS_CONST_OP(ins->left->op)) {
fprintf(fp, "\t%s $%lu, %s\n",
op, ins->left->u.cval,
reg(state, ins, mask));
}
else {
int addr_reg;
addr_reg = check_reg(state, ins->left, REGCM_GPR16);
if (!reg_is_reg(state, addr_reg, REG_DX)) {
internal_error(state, ins, "src != %%dx");
}
fprintf(fp, "\t%s %s, %s\n",
op,
reg(state, ins->left, REGCM_GPR16),
reg(state, ins, mask));
}
}
static void print_op_out(struct compile_state *state, struct triple *ins, FILE *fp)
{
const char *op;
int mask;
int lreg;
mask = 0;
switch(ins->op) {
case OP_OUTB: op = "outb", mask = REGCM_GPR8; break;
case OP_OUTW: op = "outw", mask = REGCM_GPR16; break;
case OP_OUTL: op = "outl", mask = REGCM_GPR32; break;
default:
internal_error(state, ins, "not an out operation");
op = 0;
break;
}
lreg = check_reg(state, ins->left, mask);
if (!reg_is_reg(state, lreg, REG_EAX)) {
internal_error(state, ins, "src != %%eax");
}
if (IS_CONST_OP(ins->right->op)) {
fprintf(fp, "\t%s %s, $%lu\n",
op, reg(state, ins->left, mask),
ins->right->u.cval);
}
else {
int addr_reg;
addr_reg = check_reg(state, ins->right, REGCM_GPR16);
if (!reg_is_reg(state, addr_reg, REG_DX)) {
internal_error(state, ins, "dst != %%dx");
}
fprintf(fp, "\t%s %s, %s\n",
op,
reg(state, ins->left, mask),
reg(state, ins->right, REGCM_GPR16));
}
}
static void print_op_move(struct compile_state *state,
struct triple *ins, FILE *fp)
{
/* op_move is complex because there are many types
* of registers we can move between.
*/
int omit_copy = 1; /* Is it o.k. to omit a noop copy? */
struct triple *dst, *src;
if (ins->op == OP_COPY) {
src = ins->left;
dst = ins;
}
else if (ins->op == OP_WRITE) {
dst = ins->left;
src = ins->right;
}
else {
internal_error(state, ins, "unknown move operation");
src = dst = 0;
}
if (!IS_CONST_OP(src->op)) {
int src_reg, dst_reg;
int src_regcm, dst_regcm;
src_reg = ID_REG(src->id);
dst_reg = ID_REG(dst->id);
src_regcm = arch_reg_regcm(state, src_reg);
dst_regcm = arch_reg_regcm(state, dst_reg);
/* If the class is the same just move the register */
if (src_regcm & dst_regcm &
(REGCM_GPR8 | REGCM_GPR16 | REGCM_GPR32)) {
if ((src_reg != dst_reg) || !omit_copy) {
fprintf(fp, "\tmov %s, %s\n",
reg(state, src, src_regcm),
reg(state, dst, dst_regcm));
}
}
/* Move 32bit to 16bit */
else if ((src_regcm & REGCM_GPR32) &&
(dst_regcm & REGCM_GPR16)) {
src_reg = (src_reg - REGC_GPR32_FIRST) + REGC_GPR16_FIRST;
if ((src_reg != dst_reg) || !omit_copy) {
fprintf(fp, "\tmovw %s, %s\n",
arch_reg_str(src_reg),
arch_reg_str(dst_reg));
}
}
/* Move 32bit to 8bit */
else if ((src_regcm & REGCM_GPR32_8) &&
(dst_regcm & REGCM_GPR8))
{
src_reg = (src_reg - REGC_GPR32_8_FIRST) + REGC_GPR8_FIRST;
if ((src_reg != dst_reg) || !omit_copy) {
fprintf(fp, "\tmovb %s, %s\n",
arch_reg_str(src_reg),
arch_reg_str(dst_reg));
}
}
/* Move 16bit to 8bit */
else if ((src_regcm & REGCM_GPR16_8) &&
(dst_regcm & REGCM_GPR8))
{
src_reg = (src_reg - REGC_GPR16_8_FIRST) + REGC_GPR8_FIRST;
if ((src_reg != dst_reg) || !omit_copy) {
fprintf(fp, "\tmovb %s, %s\n",
arch_reg_str(src_reg),
arch_reg_str(dst_reg));
}
}
/* Move 8/16bit to 16/32bit */
else if ((src_regcm & (REGCM_GPR8 | REGCM_GPR16)) &&
(dst_regcm & (REGC_GPR16 | REGCM_GPR32))) {
const char *op;
op = is_signed(src->type)? "movsx": "movzx";
fprintf(fp, "\t%s %s, %s\n",
op,
reg(state, src, src_regcm),
reg(state, dst, dst_regcm));
}
/* Move between sse registers */
else if ((src_regcm & dst_regcm & REGCM_XMM)) {
if ((src_reg != dst_reg) || !omit_copy) {
fprintf(fp, "\tmovdqa %s %s\n",
reg(state, src, src_regcm),
reg(state, dst, dst_regcm));
}
}
/* Move between mmx registers or mmx & sse registers */
else if ((src_regcm & (REGCM_MMX | REGCM_XMM)) &&
(dst_regcm & (REGCM_MMX | REGCM_XMM))) {
if ((src_reg != dst_reg) || !omit_copy) {
fprintf(fp, "\tmovq %s %s\n",
reg(state, src, src_regcm),
reg(state, dst, dst_regcm));
}
}
/* Move between 32bit gprs & mmx/sse registers */
else if ((src_regcm & (REGCM_GPR32 | REGCM_MMX | REGCM_XMM)) &&
(dst_regcm & (REGCM_GPR32 | REGCM_MMX | REGCM_XMM))) {
fprintf(fp, "\tmovd %s, %s\n",
reg(state, src, src_regcm),
reg(state, dst, dst_regcm));
}
else {
internal_error(state, ins, "unknown copy type");
}
}
else switch(src->op) {
case OP_INTCONST:
{
long_t value;
value = (long_t)(src->u.cval);
fprintf(fp, "\tmov $%ld, %s\n",
value,
reg(state, dst, REGCM_GPR32 | REGCM_GPR16 | REGCM_GPR8));
break;
}
case OP_ADDRCONST:
fprintf(fp, "\tmov $L%lu+%lu, %s\n",
src->left->u.cval,
src->u.cval,
reg(state, dst, REGCM_GPR32));
break;
default:
internal_error(state, ins, "uknown copy operation");
}
}
static void print_op_load(struct compile_state *state,
struct triple *ins, FILE *fp)
{
struct triple *dst, *src;
dst = ins;
src = ins->left;
if (is_const(src) || is_const(dst)) {
internal_error(state, ins, "unknown load operation");
}
fprintf(fp, "\tmov (%s), %s\n",
reg(state, src, REGCM_GPR32),
reg(state, dst, REGCM_GPR8 | REGCM_GPR16 | REGCM_GPR32));
}
static void print_op_store(struct compile_state *state,
struct triple *ins, FILE *fp)
{
struct triple *dst, *src;
dst = ins->left;
src = ins->right;
if (is_const(src) && (src->op == OP_INTCONST)) {
long_t value;
value = (long_t)(src->u.cval);
fprintf(fp, "\tmov%s $%ld, (%s)\n",
type_suffix(state, src->type),
value,
reg(state, dst, REGCM_GPR32));
}
else if (is_const(dst) && (dst->op == OP_INTCONST)) {
fprintf(fp, "\tmov%s %s, 0x%08lx\n",
type_suffix(state, src->type),
reg(state, src, REGCM_GPR8 | REGCM_GPR16 | REGCM_GPR32),
dst->u.cval);
}
else {
if (is_const(src) || is_const(dst)) {
internal_error(state, ins, "unknown store operation");
}
fprintf(fp, "\tmov%s %s, (%s)\n",
type_suffix(state, src->type),
reg(state, src, REGCM_GPR8 | REGCM_GPR16 | REGCM_GPR32),
reg(state, dst, REGCM_GPR32));
}
}
static void print_op_smul(struct compile_state *state,
struct triple *ins, FILE *fp)
{
if (!IS_CONST_OP(ins->right->op)) {
fprintf(fp, "\timul %s, %s\n",
reg(state, ins->right, REGCM_GPR32),
reg(state, ins->left, REGCM_GPR32));
}
else {
fprintf(fp, "\timul $%ld, %s\n",
ins->right->u.cval,
reg(state, ins->left, REGCM_GPR32));
}
}
static void print_op_cmp(struct compile_state *state,
struct triple *ins, FILE *fp)
{
unsigned mask;
int dreg;
mask = REGCM_GPR32 | REGCM_GPR16 | REGCM_GPR8;
dreg = check_reg(state, ins, REGCM_FLAGS);
if (!reg_is_reg(state, dreg, REG_EFLAGS)) {
internal_error(state, ins, "bad dest register for cmp");
}
if (IS_CONST_OP(ins->right->op)) {
fprintf(fp, "\tcmp $%lu, %s\n",
ins->right->u.cval,
reg(state, ins->left, mask));
}
else {
unsigned lmask, rmask;
int lreg, rreg;
lreg = check_reg(state, ins->left, mask);
rreg = check_reg(state, ins->right, mask);
lmask = arch_reg_regcm(state, lreg);
rmask = arch_reg_regcm(state, rreg);
mask = lmask & rmask;
fprintf(fp, "\tcmp %s, %s\n",
reg(state, ins->right, mask),
reg(state, ins->left, mask));
}
}
static void print_op_test(struct compile_state *state,
struct triple *ins, FILE *fp)
{
unsigned mask;
mask = REGCM_GPR32 | REGCM_GPR16 | REGCM_GPR8;
fprintf(fp, "\ttest %s, %s\n",
reg(state, ins->left, mask),
reg(state, ins->left, mask));
}
static void print_op_branch(struct compile_state *state,
struct triple *branch, FILE *fp)
{
const char *bop = "j";
if (branch->op == OP_JMP) {
if (branch->right) {
internal_error(state, branch, "jmp with condition?");
}
bop = "jmp";
}
else {
if (!branch->right) {
internal_error(state, branch, "jmpcc without condition?");
}
check_reg(state, branch->right, REGCM_FLAGS);
if ((branch->right->op != OP_CMP) &&
(branch->right->op != OP_TEST)) {
internal_error(state, branch, "bad branch test");
}
#warning "FIXME I have observed instructions between the test and branch instructions"
if (branch->right->next != branch) {
internal_error(state, branch, "branch does not follow test");
}
switch(branch->op) {
case OP_JMP_EQ: bop = "jz"; break;
case OP_JMP_NOTEQ: bop = "jnz"; break;
case OP_JMP_SLESS: bop = "jl"; break;
case OP_JMP_ULESS: bop = "jb"; break;
case OP_JMP_SMORE: bop = "jg"; break;
case OP_JMP_UMORE: bop = "ja"; break;
case OP_JMP_SLESSEQ: bop = "jle"; break;
case OP_JMP_ULESSEQ: bop = "jbe"; break;
case OP_JMP_SMOREEQ: bop = "jge"; break;
case OP_JMP_UMOREEQ: bop = "jae"; break;
default:
internal_error(state, branch, "Invalid branch op");
break;
}
}
fprintf(fp, "\t%s L%lu\n",
bop, branch->left->u.cval);
}
static void print_op_set(struct compile_state *state,
struct triple *set, FILE *fp)
{
const char *sop = "set";
if (!set->left) {
internal_error(state, set, "setcc without condition?");
}
check_reg(state, set->left, REGCM_FLAGS);
if ((set->left->op != OP_CMP) &&
(set->left->op != OP_TEST)) {
internal_error(state, set, "bad set test");
}
if (set->left->next != set) {
internal_error(state, set, "set does not follow test");
}
switch(set->op) {
case OP_SET_EQ: sop = "setz"; break;
case OP_SET_NOTEQ: sop = "setnz"; break;
case OP_SET_SLESS: sop = "setl"; break;
case OP_SET_ULESS: sop = "setb"; break;
case OP_SET_SMORE: sop = "setg"; break;
case OP_SET_UMORE: sop = "seta"; break;
case OP_SET_SLESSEQ: sop = "setle"; break;
case OP_SET_ULESSEQ: sop = "setbe"; break;
case OP_SET_SMOREEQ: sop = "setge"; break;
case OP_SET_UMOREEQ: sop = "setae"; break;
default:
internal_error(state, set, "Invalid set op");
break;
}
fprintf(fp, "\t%s %s\n",
sop, reg(state, set, REGCM_GPR8));
}
static void print_op_bit_scan(struct compile_state *state,
struct triple *ins, FILE *fp)
{
const char *op;
switch(ins->op) {
case OP_BSF: op = "bsf"; break;
case OP_BSR: op = "bsr"; break;
default:
internal_error(state, ins, "unknown bit scan");
op = 0;
break;
}
fprintf(fp,
"\t%s %s, %s\n"
"\tjnz 1f\n"
"\tmovl $-1, %s\n"
"1:\n",
op,
reg(state, ins->left, REGCM_GPR32),
reg(state, ins, REGCM_GPR32),
reg(state, ins, REGCM_GPR32));
}
static void print_const(struct compile_state *state,
struct triple *ins, FILE *fp)
{
switch(ins->op) {
case OP_INTCONST:
switch(ins->type->type & TYPE_MASK) {
case TYPE_CHAR:
case TYPE_UCHAR:
fprintf(fp, ".byte 0x%02lx\n", ins->u.cval);
break;
case TYPE_SHORT:
case TYPE_USHORT:
fprintf(fp, ".short 0x%04lx\n", ins->u.cval);
break;
case TYPE_INT:
case TYPE_UINT:
case TYPE_LONG:
case TYPE_ULONG:
fprintf(fp, ".int %lu\n", ins->u.cval);
break;
default:
internal_error(state, ins, "Unknown constant type");
}
break;
case OP_BLOBCONST:
{
unsigned char *blob;
size_t size, i;
size = size_of(state, ins->type);
blob = ins->u.blob;
for(i = 0; i < size; i++) {
fprintf(fp, ".byte 0x%02x\n",
blob[i]);
}
break;
}
#if 0
case OP_ADDRCONST:
fprintf(fp, ".int $L%lu+%lu",
ins->left->u.cval,
ins->u.cval);
break;
#endif
default:
internal_error(state, ins, "Unknown constant type");
break;
}
}
static void print_sdecl(struct compile_state *state,
struct triple *ins, FILE *fp)
{
fprintf(fp, ".section \".rom.data\"\n");
fprintf(fp, ".balign %d\n", align_of(state, ins->type));
fprintf(fp, "L%lu:\n", ins->u.cval);
print_const(state, ins->left, fp);
fprintf(fp, ".section \".rom.text\"\n");
}
static void print_instruction(struct compile_state *state,
struct triple *ins, FILE *fp)
{
/* Assumption: after I have exted the register allocator
* everything is in a valid register.
*/
switch(ins->op) {
case OP_ADD: print_binary_op(state, "add", ins, fp); break;
case OP_SUB: print_binary_op(state, "sub", ins, fp); break;
case OP_AND: print_binary_op(state, "and", ins, fp); break;
case OP_XOR: print_binary_op(state, "xor", ins, fp); break;
case OP_OR: print_binary_op(state, "or", ins, fp); break;
case OP_SL: print_op_shift(state, "shl", ins, fp); break;
case OP_USR: print_op_shift(state, "shr", ins, fp); break;
case OP_SSR: print_op_shift(state, "sar", ins, fp); break;
case OP_POS: break;
case OP_NEG: print_unary_op(state, "neg", ins, fp); break;
case OP_INVERT: print_unary_op(state, "not", ins, fp); break;
case OP_INTCONST:
case OP_ADDRCONST:
/* Don't generate anything here for constants */
case OP_PHI:
/* Don't generate anything for variable declarations. */
break;
case OP_SDECL:
print_sdecl(state, ins, fp);
break;
case OP_WRITE:
case OP_COPY:
print_op_move(state, ins, fp);
break;
case OP_LOAD:
print_op_load(state, ins, fp);
break;
case OP_STORE:
print_op_store(state, ins, fp);
break;
case OP_SMUL:
print_op_smul(state, ins, fp);
break;
case OP_CMP: print_op_cmp(state, ins, fp); break;
case OP_TEST: print_op_test(state, ins, fp); break;
case OP_JMP:
case OP_JMP_EQ: case OP_JMP_NOTEQ:
case OP_JMP_SLESS: case OP_JMP_ULESS:
case OP_JMP_SMORE: case OP_JMP_UMORE:
case OP_JMP_SLESSEQ: case OP_JMP_ULESSEQ:
case OP_JMP_SMOREEQ: case OP_JMP_UMOREEQ:
print_op_branch(state, ins, fp);
break;
case OP_SET_EQ: case OP_SET_NOTEQ:
case OP_SET_SLESS: case OP_SET_ULESS:
case OP_SET_SMORE: case OP_SET_UMORE:
case OP_SET_SLESSEQ: case OP_SET_ULESSEQ:
case OP_SET_SMOREEQ: case OP_SET_UMOREEQ:
print_op_set(state, ins, fp);
break;
case OP_INB: case OP_INW: case OP_INL:
print_op_in(state, ins, fp);
break;
case OP_OUTB: case OP_OUTW: case OP_OUTL:
print_op_out(state, ins, fp);
break;
case OP_BSF:
case OP_BSR:
print_op_bit_scan(state, ins, fp);
break;
case OP_HLT:
fprintf(fp, "\thlt\n");
break;
case OP_LABEL:
if (!ins->use) {
return;
}
fprintf(fp, "L%lu:\n", ins->u.cval);
break;
/* Operations I am not yet certain how to handle */
case OP_UMUL:
case OP_SDIV: case OP_UDIV:
case OP_SMOD: case OP_UMOD:
/* Operations that should never get here */
case OP_LTRUE: case OP_LFALSE: case OP_EQ: case OP_NOTEQ:
case OP_SLESS: case OP_ULESS: case OP_SMORE: case OP_UMORE:
case OP_SLESSEQ: case OP_ULESSEQ: case OP_SMOREEQ: case OP_UMOREEQ:
default:
internal_error(state, ins, "unknown op: %d %s",
ins->op, tops(ins->op));
break;
}
}
static void print_instructions(struct compile_state *state)
{
struct triple *first, *ins;
int print_location;
int last_line;
int last_col;
const char *last_filename;
FILE *fp;
print_location = 1;
last_line = -1;
last_col = -1;
last_filename = 0;
fp = stdout;
fprintf(fp, ".section \".rom.text\"\n");
first = state->main_function->left;
ins = first;
do {
if (print_location &&
((last_filename != ins->filename) ||
(last_line != ins->line) ||
(last_col != ins->col))) {
fprintf(fp, "\t/* %s:%d */\n",
ins->filename, ins->line);
last_filename = ins->filename;
last_line = ins->line;
last_col = ins->col;
}
print_instruction(state, ins, fp);
ins = ins->next;
} while(ins != first);
}
static void generate_code(struct compile_state *state)
{
generate_local_labels(state);
print_instructions(state);
}
static void print_tokens(struct compile_state *state)
{
struct token *tk;
tk = &state->token[0];
do {
#if 1
token(state, 0);
#else
next_token(state, 0);
#endif
loc(stdout, state, 0);
printf("%s <- `%s'\n",
tokens[tk->tok],
tk->ident ? tk->ident->name :
tk->str_len ? tk->val.str : "");
} while(tk->tok != TOK_EOF);
}
static void compile(char *filename, int debug, int opt)
{
int i;
struct compile_state state;
memset(&state, 0, sizeof(state));
state.file = 0;
for(i = 0; i < sizeof(state.token)/sizeof(state.token[0]); i++) {
memset(&state.token[i], 0, sizeof(state.token[i]));
state.token[i].tok = -1;
}
/* Remember the debug settings */
state.debug = debug;
state.optimize = opt;
/* Prep the preprocessor */
state.if_depth = 0;
state.if_value = 0;
/* register the C keywords */
register_keywords(&state);
/* register the keywords the macro preprocessor knows */
register_macro_keywords(&state);
/* Memorize where some special keywords are. */
state.i_continue = lookup(&state, "continue", 8);
state.i_break = lookup(&state, "break", 5);
/* Enter the globl definition scope */
start_scope(&state);
register_builtins(&state);
compile_file(&state, filename, 1);
#if 0
print_tokens(&state);
#endif
decls(&state);
/* Exit the global definition scope */
end_scope(&state);
/* Now that basic compilation has happened
* optimize the intermediate code
*/
optimize(&state);
generate_code(&state);
if (state.debug) {
fprintf(stderr, "done\n");
}
}
static void version(void)
{
printf("romcc " VERSION " released " RELEASE_DATE "\n");
}
static void usage(void)
{
version();
printf(
"Usage: romcc <source>.c\n"
"Compile a C source file without using ram\n"
);
}
static void arg_error(char *fmt, ...)
{
va_list args;
va_start(args, fmt);
vfprintf(stderr, fmt, args);
va_end(args);
usage();
exit(1);
}
int main(int argc, char **argv)
{
char *filename;
int last_argc;
int debug;
int optimize;
optimize = 0;
debug = 0;
last_argc = -1;
while((argc > 1) && (argc != last_argc)) {
last_argc = argc;
if (strncmp(argv[1], "--debug=", 8) == 0) {
debug = atoi(argv[1] + 8);
argv++;
argc--;
}
else if ((strcmp(argv[1],"-O") == 0) ||
(strcmp(argv[1], "-O1") == 0)) {
optimize = 1;
argv++;
argc--;
}
else if (strcmp(argv[1],"-O2") == 0) {
optimize = 2;
argv++;
argc--;
}
}
if (argc != 2) {
arg_error("Wrong argument count %d\n", argc);
}
filename = argv[1];
compile(filename, debug, optimize);
return 0;
}
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