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DEFINITIONS
This source file includes following definitions.
- zend_get_persistent_constant
- print_block
- find_code_blocks
- replace_source
- del_source
- delete_code_block
- zend_access_path
- zend_rebuild_access_path
- strip_nop
- zend_optimize_block
- assemble_code_blocks
- zend_jmp_optimization
- zend_t_usage
- zend_block_optimization
#define DEBUG_BLOCKPASS 0
/* Checks if a constant (like "true") may be replaced by its value */
static int zend_get_persistent_constant(char *name, uint name_len, zval *result, int copy TSRMLS_DC ELS_DC)
{
zend_constant *c;
char *lookup_name;
int retval = 1;
ALLOCA_FLAG(use_heap);
if (zend_hash_find(EG(zend_constants), name, name_len + 1, (void **) &c) == FAILURE) {
lookup_name = DO_ALLOCA(name_len + 1);
memcpy(lookup_name, name, name_len + 1);
zend_str_tolower(lookup_name, name_len);
if (zend_hash_find(EG(zend_constants), lookup_name, name_len + 1, (void **) &c) == SUCCESS) {
if (!(c->flags & CONST_CT_SUBST) || (c->flags & CONST_CS)) {
retval = 0;
}
} else {
retval = 0;
}
FREE_ALLOCA(lookup_name);
}
if (retval) {
if (c->flags & CONST_PERSISTENT) {
*result = c->value;
if (copy) {
zval_copy_ctor(result);
}
} else {
retval = 0;
}
}
return retval;
}
#if DEBUG_BLOCKPASS
# define BLOCK_REF(b) b?op_array->opcodes-b->start_opline:-1
static inline void print_block(zend_code_block *block, zend_op *opcodes, char *txt)
{
fprintf(stderr, "%sBlock: %d-%d (%d)", txt, block->start_opline - opcodes, block->start_opline - opcodes + block->len - 1, block->len);
if (!block->access) {
fprintf(stderr, " unused");
}
if (block->op1_to) {
fprintf(stderr, " 1: %d", block->op1_to->start_opline - opcodes);
}
if (block->op2_to) {
fprintf(stderr, " 2: %d", block->op2_to->start_opline - opcodes);
}
if (block->ext_to) {
fprintf(stderr, " e: %d", block->ext_to->start_opline - opcodes);
}
if (block->follow_to) {
fprintf(stderr, " f: %d", block->follow_to->start_opline - opcodes);
}
if (block->sources) {
zend_block_source *bs = block->sources;
fprintf(stderr, " s:");
while (bs) {
fprintf(stderr, " %d", bs->from->start_opline - opcodes);
bs = bs->next;
}
}
fprintf(stderr, "\n");
fflush(stderr);
}
#else
#define print_block(a,b,c)
#endif
#define START_BLOCK_OP(opno) blocks[opno].start_opline = &op_array->opcodes[opno]; blocks[opno].start_opline_no = opno; blocks[opno].access = 1
/* find code blocks in op_array
code block is a set of opcodes with single flow of control, i.e. without jmps,
branches, etc. */
static int find_code_blocks(zend_op_array *op_array, zend_cfg *cfg)
{
zend_op *opline;
zend_op *end = op_array->opcodes + op_array->last;
zend_code_block *blocks, *cur_block;
zend_uint opno = 0;
memset(cfg, 0, sizeof(zend_cfg));
blocks = cfg->blocks = ecalloc(op_array->last + 2, sizeof(zend_code_block));
opline = op_array->opcodes;
blocks[0].start_opline = opline;
blocks[0].start_opline_no = 0;
while (opline < end) {
switch((unsigned)opline->opcode) {
case ZEND_BRK:
case ZEND_CONT:
#if ZEND_EXTENSION_API_NO >= PHP_5_3_X_API_NO
case ZEND_GOTO:
#endif
/* would not optimize non-optimized BRK/CONTs - we cannot
really know where it jumps, so these optimizations are
too dangerous */
efree(blocks);
return 0;
#if ZEND_EXTENSION_API_NO > PHP_5_4_X_API_NO
case ZEND_FAST_CALL:
START_BLOCK_OP(ZEND_OP1(opline).opline_num);
if (opline->extended_value) {
START_BLOCK_OP(ZEND_OP2(opline).opline_num);
}
START_BLOCK_OP(opno + 1);
break;
case ZEND_FAST_RET:
if (opline->extended_value) {
START_BLOCK_OP(ZEND_OP2(opline).opline_num);
}
START_BLOCK_OP(opno + 1);
break;
#endif
case ZEND_JMP:
START_BLOCK_OP(ZEND_OP1(opline).opline_num);
/* break missing intentionally */
case ZEND_RETURN:
#if ZEND_EXTENSION_API_NO > PHP_5_3_X_API_NO
case ZEND_RETURN_BY_REF:
#endif
#if ZEND_EXTENSION_API_NO > PHP_5_4_X_API_NO
case ZEND_GENERATOR_RETURN:
#endif
case ZEND_EXIT:
case ZEND_THROW:
/* start new block from this+1 */
START_BLOCK_OP(opno + 1);
break;
/* TODO: if conditional jmp depends on constant,
don't start block that won't be executed */
case ZEND_CATCH:
START_BLOCK_OP(opline->extended_value);
START_BLOCK_OP(opno + 1);
break;
case ZEND_JMPZNZ:
START_BLOCK_OP(opline->extended_value);
case ZEND_JMPZ:
case ZEND_JMPNZ:
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
case ZEND_FE_RESET:
case ZEND_NEW:
#if ZEND_EXTENSION_API_NO >= PHP_5_3_X_API_NO
case ZEND_JMP_SET:
#endif
#if ZEND_EXTENSION_API_NO > PHP_5_3_X_API_NO
case ZEND_JMP_SET_VAR:
#endif
START_BLOCK_OP(ZEND_OP2(opline).opline_num);
START_BLOCK_OP(opno + 1);
break;
case ZEND_FE_FETCH:
START_BLOCK_OP(ZEND_OP2(opline).opline_num);
START_BLOCK_OP(opno + 2);
break;
}
opno++;
opline++;
}
/* first find block start points */
if (op_array->last_try_catch) {
int i;
cfg->try = ecalloc(op_array->last_try_catch, sizeof(zend_code_block *));
cfg->catch = ecalloc(op_array->last_try_catch, sizeof(zend_code_block *));
for (i = 0; i< op_array->last_try_catch; i++) {
cfg->try[i] = &blocks[op_array->try_catch_array[i].try_op];
cfg->catch[i] = &blocks[op_array->try_catch_array[i].catch_op];
START_BLOCK_OP(op_array->try_catch_array[i].try_op);
START_BLOCK_OP(op_array->try_catch_array[i].catch_op);
blocks[op_array->try_catch_array[i].try_op].protected = 1;
}
}
/* Currently, we don't optimize op_arrays with BRK/CONT/GOTO opcodes,
* but, we have to keep brk_cont_array to avoid memory leaks during
* exception handling */
if (op_array->last_brk_cont) {
int i, j;
j = 0;
for (i = 0; i< op_array->last_brk_cont; i++) {
if (op_array->brk_cont_array[i].start >= 0 &&
(op_array->opcodes[op_array->brk_cont_array[i].brk].opcode == ZEND_FREE ||
op_array->opcodes[op_array->brk_cont_array[i].brk].opcode == ZEND_SWITCH_FREE)) {
int parent = op_array->brk_cont_array[i].parent;
while (parent >= 0 &&
op_array->brk_cont_array[parent].start < 0 &&
op_array->opcodes[op_array->brk_cont_array[parent].brk].opcode != ZEND_FREE &&
op_array->opcodes[op_array->brk_cont_array[parent].brk].opcode != ZEND_SWITCH_FREE) {
parent = op_array->brk_cont_array[parent].parent;
}
op_array->brk_cont_array[i].parent = parent;
j++;
}
}
if (j) {
cfg->loop_start = ecalloc(op_array->last_brk_cont, sizeof(zend_code_block *));
cfg->loop_cont = ecalloc(op_array->last_brk_cont, sizeof(zend_code_block *));
cfg->loop_brk = ecalloc(op_array->last_brk_cont, sizeof(zend_code_block *));
j = 0;
for (i = 0; i< op_array->last_brk_cont; i++) {
if (op_array->brk_cont_array[i].start >= 0 &&
(op_array->opcodes[op_array->brk_cont_array[i].brk].opcode == ZEND_FREE ||
op_array->opcodes[op_array->brk_cont_array[i].brk].opcode == ZEND_SWITCH_FREE)) {
if (i != j) {
op_array->brk_cont_array[j] = op_array->brk_cont_array[i];
}
cfg->loop_start[j] = &blocks[op_array->brk_cont_array[j].start];
cfg->loop_cont[j] = &blocks[op_array->brk_cont_array[j].cont];
cfg->loop_brk[j] = &blocks[op_array->brk_cont_array[j].brk];
START_BLOCK_OP(op_array->brk_cont_array[j].start);
START_BLOCK_OP(op_array->brk_cont_array[j].cont);
START_BLOCK_OP(op_array->brk_cont_array[j].brk);
blocks[op_array->brk_cont_array[j].start].protected = 1;
blocks[op_array->brk_cont_array[j].brk].protected = 1;
j++;
}
}
op_array->last_brk_cont = j;
} else {
efree(op_array->brk_cont_array);
op_array->brk_cont_array = NULL;
op_array->last_brk_cont = 0;
}
}
/* Build CFG (Control Flow Graph) */
cur_block = blocks;
for (opno = 1; opno < op_array->last; opno++) {
if (blocks[opno].start_opline) {
/* found new block start */
cur_block->len = blocks[opno].start_opline - cur_block->start_opline;
cur_block->next = &blocks[opno];
/* what is the last OP of previous block? */
opline = blocks[opno].start_opline - 1;
if (opline->opcode == ZEND_OP_DATA) {
opline--;
}
switch((unsigned)opline->opcode) {
case ZEND_RETURN:
#if ZEND_EXTENSION_API_NO > PHP_5_3_X_API_NO
case ZEND_RETURN_BY_REF:
#endif
#if ZEND_EXTENSION_API_NO > PHP_5_4_X_API_NO
case ZEND_GENERATOR_RETURN:
#endif
case ZEND_EXIT:
case ZEND_THROW:
break;
#if ZEND_EXTENSION_API_NO > PHP_5_4_X_API_NO
case ZEND_FAST_CALL:
if (opline->extended_value) {
cur_block->op2_to = &blocks[ZEND_OP2(opline).opline_num];
}
cur_block->op1_to = &blocks[ZEND_OP1(opline).opline_num];
break;
case ZEND_FAST_RET:
if (opline->extended_value) {
cur_block->op2_to = &blocks[ZEND_OP2(opline).opline_num];
}
break;
#endif
case ZEND_JMP:
cur_block->op1_to = &blocks[ZEND_OP1(opline).opline_num];
break;
case ZEND_JMPZNZ:
cur_block->op2_to = &blocks[ZEND_OP2(opline).opline_num];
cur_block->ext_to = &blocks[opline->extended_value];
break;
case ZEND_CATCH:
cur_block->ext_to = &blocks[opline->extended_value];
cur_block->follow_to = &blocks[opno];
break;
case ZEND_JMPZ:
case ZEND_JMPNZ:
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
case ZEND_FE_RESET:
case ZEND_NEW:
#if ZEND_EXTENSION_API_NO >= PHP_5_3_X_API_NO
case ZEND_JMP_SET:
#endif
#if ZEND_EXTENSION_API_NO > PHP_5_3_X_API_NO
case ZEND_JMP_SET_VAR:
#endif
case ZEND_FE_FETCH:
cur_block->op2_to = &blocks[ZEND_OP2(opline).opline_num];
/* break missing intentionally */
default:
/* next block follows this */
cur_block->follow_to = &blocks[opno];
break;
}
print_block(cur_block, op_array->opcodes, "");
cur_block = cur_block->next;
}
}
cur_block->len = end - cur_block->start_opline;
cur_block->next = &blocks[op_array->last + 1];
print_block(cur_block, op_array->opcodes, "");
return 1;
}
/* CFG back references management */
#define ADD_SOURCE(fromb, tob) { \
zend_block_source *__s = tob->sources; \
while (__s && __s->from != fromb) __s = __s->next; \
if (__s == NULL) { \
zend_block_source *__t = emalloc(sizeof(zend_block_source)); \
__t->next = tob->sources; \
tob->sources = __t; \
__t->from = fromb; \
} \
}
#define DEL_SOURCE(cs) { \
zend_block_source *__ns = (*cs)->next; \
efree(*cs); \
*cs = __ns; \
}
static inline void replace_source(zend_block_source *list, zend_code_block *old, zend_code_block *new)
{
/* replace all references to 'old' in 'list' with 'new' */
zend_block_source **cs;
int found = 0;
for (cs = &list; *cs; cs = &((*cs)->next)) {
if ((*cs)->from == new) {
if (found) {
DEL_SOURCE(cs);
} else {
found = 1;
}
}
if ((*cs)->from == old) {
if (found) {
DEL_SOURCE(cs);
} else {
(*cs)->from = new;
found = 1;
}
}
}
}
static inline void del_source(zend_code_block *from, zend_code_block *to)
{
/* delete source 'from' from 'to'-s sources list */
zend_block_source **cs = &to->sources;
if (to->sources == NULL) {
to->access = 0;
return;
}
while (*cs) {
if ((*cs)->from == from) {
DEL_SOURCE(cs);
break;
}
cs = &((*cs)->next);
}
if (to->sources == NULL) {
/* 'to' has no more sources - it's unused, will be stripped */
to->access = 0;
return;
}
if (to->sources->next == NULL) {
/* source to only one block */
zend_code_block *from_block = to->sources->from;
if (from_block->access && from_block->follow_to == to &&
from_block->op1_to == NULL &&
from_block->op2_to == NULL &&
from_block->ext_to == NULL) {
/* this block follows it's only predecessor - we can join them */
zend_op *new_to = from_block->start_opline + from_block->len;
if (new_to != to->start_opline) {
/* move block to new location */
memmove(new_to, to->start_opline, sizeof(zend_op)*to->len);
}
/* join blocks' lengths */
from_block->len += to->len;
/* move 'to'`s references to 'from' */
to->start_opline = NULL;
to->access = 0;
efree(to->sources);
to->sources = NULL;
from_block->follow_to = to->follow_to;
if (to->op1_to) {
from_block->op1_to = to->op1_to;
replace_source(to->op1_to->sources, to, from_block);
}
if (to->op2_to) {
from_block->op2_to = to->op2_to;
replace_source(to->op2_to->sources, to, from_block);
}
if (to->ext_to) {
from_block->ext_to = to->ext_to;
replace_source(to->ext_to->sources, to, from_block);
}
if (to->follow_to) {
replace_source(to->follow_to->sources, to, from_block);
}
/* remove "to" from list */
}
}
}
static void delete_code_block(zend_code_block *block)
{
if (block->protected) {
return;
}
if (block->follow_to) {
zend_block_source *bs = block->sources;
while (bs) {
zend_code_block *from_block = bs->from;
zend_code_block *to = block->follow_to;
if (from_block->op1_to == block) {
from_block->op1_to = to;
ADD_SOURCE(from_block, to);
}
if (from_block->op2_to == block) {
from_block->op2_to = to;
ADD_SOURCE(from_block, to);
}
if (from_block->ext_to == block) {
from_block->ext_to = to;
ADD_SOURCE(from_block, to);
}
if (from_block->follow_to == block) {
from_block->follow_to = to;
ADD_SOURCE(from_block, to);
}
bs = bs->next;
}
}
block->access = 0;
}
static void zend_access_path(zend_code_block *block)
{
if (block->access) {
return;
}
block->access = 1;
if (block->op1_to) {
zend_access_path(block->op1_to);
ADD_SOURCE(block, block->op1_to);
}
if (block->op2_to) {
zend_access_path(block->op2_to);
ADD_SOURCE(block, block->op2_to);
}
if (block->ext_to) {
zend_access_path(block->ext_to);
ADD_SOURCE(block, block->ext_to);
}
if (block->follow_to) {
zend_access_path(block->follow_to);
ADD_SOURCE(block, block->follow_to);
}
}
/* Traverse CFG, mark reachable basic blocks and build back references */
static void zend_rebuild_access_path(zend_cfg *cfg, zend_op_array *op_array, int find_start)
{
zend_code_block *blocks = cfg->blocks;
zend_code_block *start = find_start? NULL : blocks;
zend_code_block *b;
/* Mark all blocks as unaccessible and destroy back references */
b = blocks;
while (b != NULL) {
zend_block_source *cs;
if (!start && b->access) {
start = b;
}
b->access = 0;
cs = b->sources;
while (cs) {
zend_block_source *n = cs->next;
efree(cs);
cs = n;
}
b->sources = NULL;
b = b->next;
}
/* Walk thorough all paths */
zend_access_path(start);
/* Add brk/cont paths */
if (op_array->last_brk_cont) {
int i;
for (i=0; i< op_array->last_brk_cont; i++) {
zend_access_path(cfg->loop_start[i]);
zend_access_path(cfg->loop_cont[i]);
zend_access_path(cfg->loop_brk[i]);
}
}
/* Add exception paths */
if (op_array->last_try_catch) {
int i;
for (i=0; i< op_array->last_try_catch; i++) {
if (!cfg->catch[i]->access) {
zend_access_path(cfg->catch[i]);
}
}
}
}
/* Data dependencies macros */
#if ZEND_EXTENSION_API_NO > PHP_5_3_X_API_NO
# define VAR_NUM_EX(op) ((op ## _type & (IS_TMP_VAR|IS_VAR))?VAR_NUM((op).var):(op).var)
# define VAR_SOURCE(op) Tsource[VAR_NUM(op.var)]
# define SET_VAR_SOURCE(opline) Tsource[VAR_NUM(opline->result.var)] = opline
# define VAR_UNSET(op) do { if (op ## _type & (IS_TMP_VAR|IS_VAR)) {VAR_SOURCE(op) = NULL;}} while (0)
#else
# define VAR_NUM_EX(op) ((op).op_type == IS_TMP_VAR || (op).op_type == IS_VAR? VAR_NUM((op).u.var) : (op).u.var)
# define VAR_SOURCE(op) Tsource[VAR_NUM(op.u.var)]
# define SET_VAR_SOURCE(opline) Tsource[VAR_NUM(ZEND_RESULT(opline).var)] = opline
# define VAR_UNSET(op) do { if ((op).op_type == IS_TMP_VAR || (op).op_type == IS_VAR) {VAR_SOURCE(op) = NULL;}} while (0)
#endif
#define convert_to_string_safe(v) \
if (Z_TYPE_P((v)) == IS_NULL) { \
ZVAL_STRINGL((v), "", 0, 1); \
} else { \
convert_to_string((v)); \
}
static void strip_nop(zend_code_block *block)
{
zend_op *opline = block->start_opline;
zend_op *end, *new_end;
/* remove leading NOPs */
while (block->len > 0 && block->start_opline->opcode == ZEND_NOP) {
if (block->len == 1) {
/* this block is all NOPs, join with following block */
if (block->follow_to) {
delete_code_block(block);
}
return;
}
block->start_opline++;
block->start_opline_no++;
block->len--;
}
/* strip the inside NOPs */
opline = new_end = block->start_opline;
end = opline + block->len;
while (opline < end) {
zend_op *src;
int len = 0;
while (opline < end && opline->opcode == ZEND_NOP) {
opline++;
}
src = opline;
while (opline < end && opline->opcode != ZEND_NOP) {
opline++;
}
len = opline - src;
/* move up non-NOP opcodes */
memmove(new_end, src, len*sizeof(zend_op));
new_end += len;
}
block->len = new_end - block->start_opline;
}
static void zend_optimize_block(zend_code_block *block, zend_op_array *op_array, char *used_ext TSRMLS_DC)
{
zend_op *opline = block->start_opline;
zend_op *end, *last_op = NULL;
zend_op **Tsource = NULL;
print_block(block, op_array->opcodes, "Opt ");
/* remove leading NOPs */
while (block->len > 0 && block->start_opline->opcode == ZEND_NOP) {
if (block->len == 1) {
/* this block is all NOPs, join with following block */
if (block->follow_to) {
delete_code_block(block);
}
return;
}
block->start_opline++;
block->start_opline_no++;
block->len--;
}
/* we track data dependencies only insight a single basic block */
if (op_array->T) {
Tsource = ecalloc(op_array->T, sizeof(zend_op *));
}
opline = block->start_opline;
end = opline + block->len;
while ((op_array->T) && (opline < end)) {
/* strip X = QM_ASSIGN(const) */
if (ZEND_OP1_TYPE(opline) == IS_TMP_VAR &&
VAR_SOURCE(opline->op1) &&
VAR_SOURCE(opline->op1)->opcode == ZEND_QM_ASSIGN &&
ZEND_OP1_TYPE(VAR_SOURCE(opline->op1)) == IS_CONST &&
opline->opcode != ZEND_CASE && /* CASE _always_ expects variable */
opline->opcode != ZEND_FETCH_DIM_TMP_VAR && /* in 5.1, FETCH_DIM_TMP_VAR expects T */
opline->opcode != ZEND_FE_RESET &&
opline->opcode != ZEND_FREE
) {
zend_op *src = VAR_SOURCE(opline->op1);
zval c = ZEND_OP1_LITERAL(src);
VAR_UNSET(opline->op1);
zval_copy_ctor(&c);
update_op1_const(op_array, opline, &c TSRMLS_CC);
literal_dtor(&ZEND_OP1_LITERAL(src));
MAKE_NOP(src);
}
/* T = QM_ASSIGN(C), F(T) => NOP, F(C) */
if (ZEND_OP2_TYPE(opline) == IS_TMP_VAR &&
VAR_SOURCE(opline->op2) &&
VAR_SOURCE(opline->op2)->opcode == ZEND_QM_ASSIGN &&
ZEND_OP1_TYPE(VAR_SOURCE(opline->op2)) == IS_CONST) {
zend_op *src = VAR_SOURCE(opline->op2);
zval c = ZEND_OP1_LITERAL(src);
VAR_UNSET(opline->op2);
zval_copy_ctor(&c);
update_op2_const(op_array, opline, &c TSRMLS_CC);
literal_dtor(&ZEND_OP1_LITERAL(src));
MAKE_NOP(src);
}
/* T = PRINT(X), F(T) => ECHO(X), F(1) */
if (ZEND_OP1_TYPE(opline) == IS_TMP_VAR &&
VAR_SOURCE(opline->op1) &&
VAR_SOURCE(opline->op1)->opcode == ZEND_PRINT &&
opline->opcode != ZEND_CASE && opline->opcode != ZEND_FREE) {
ZEND_OP1_TYPE(opline) = IS_CONST;
LITERAL_LONG(opline->op1, 1);
}
if (ZEND_OP2_TYPE(opline) == IS_TMP_VAR &&
VAR_SOURCE(opline->op2) &&
VAR_SOURCE(opline->op2)->opcode == ZEND_PRINT) {
ZEND_OP2_TYPE(opline) = IS_CONST;
LITERAL_LONG(opline->op2, 1);
}
/* T = CAST(X, String), ECHO(T) => NOP, ECHO(X) */
if ((opline->opcode == ZEND_ECHO || opline->opcode == ZEND_PRINT) &&
ZEND_OP1_TYPE(opline) == IS_TMP_VAR &&
VAR_SOURCE(opline->op1) &&
VAR_SOURCE(opline->op1)->opcode == ZEND_CAST &&
VAR_SOURCE(opline->op1)->extended_value == IS_STRING) {
zend_op *src = VAR_SOURCE(opline->op1);
COPY_NODE(opline->op1, src->op1);
MAKE_NOP(src);
}
/* T = PRINT(X), FREE(T) => ECHO(X) */
if (opline->opcode == ZEND_FREE &&
ZEND_OP1_TYPE(opline) == IS_TMP_VAR &&
VAR_SOURCE(opline->op1)) {
zend_op *src = VAR_SOURCE(opline->op1);
if (src->opcode == ZEND_PRINT) {
src->opcode = ZEND_ECHO;
ZEND_RESULT_TYPE(src) = IS_UNUSED;
MAKE_NOP(opline);
}
}
/* T = BOOL(X), FREE(T) => NOP */
if (opline->opcode == ZEND_FREE &&
ZEND_OP1_TYPE(opline) == IS_TMP_VAR &&
VAR_SOURCE(opline->op1)) {
zend_op *src = VAR_SOURCE(opline->op1);
if (src->opcode == ZEND_BOOL) {
if (ZEND_OP1_TYPE(src) == IS_CONST) {
literal_dtor(&ZEND_OP1_LITERAL(src));
}
MAKE_NOP(src);
MAKE_NOP(opline);
}
}
#if 0
/* pre-evaluate functions:
constant(x)
defined(x)
function_exists(x)
extension_loaded(x)
BAD: interacts badly with Accelerator
*/
if((ZEND_OP1_TYPE(opline) & IS_VAR) &&
VAR_SOURCE(opline->op1) && VAR_SOURCE(opline->op1)->opcode == ZEND_DO_CF_FCALL &&
VAR_SOURCE(opline->op1)->extended_value == 1) {
zend_op *fcall = VAR_SOURCE(opline->op1);
zend_op *sv = fcall-1;
if(sv >= block->start_opline && sv->opcode == ZEND_SEND_VAL &&
ZEND_OP1_TYPE(sv) == IS_CONST && Z_TYPE(OPLINE_OP1_LITERAL(sv)) == IS_STRING &&
Z_LVAL(OPLINE_OP2_LITERAL(sv)) == 1
) {
zval *arg = &OPLINE_OP1_LITERAL(sv);
char *fname = FUNCTION_CACHE->funcs[Z_LVAL(ZEND_OP1_LITERAL(fcall))].function_name;
int flen = FUNCTION_CACHE->funcs[Z_LVAL(ZEND_OP1_LITERAL(fcall))].name_len;
if(flen == sizeof("defined")-1 && zend_binary_strcasecmp(fname, flen, "defined", sizeof("defined")-1) == 0) {
zval c;
if(zend_get_persistent_constant(Z_STRVAL_P(arg), Z_STRLEN_P(arg), &c, 0 TSRMLS_CC ELS_CC) != 0) {
literal_dtor(arg);
MAKE_NOP(sv);
MAKE_NOP(fcall);
LITERAL_BOOL(opline->op1, 1);
ZEND_OP1_TYPE(opline) = IS_CONST;
}
} else if((flen == sizeof("function_exists")-1 && zend_binary_strcasecmp(fname, flen, "function_exists", sizeof("function_exists")-1) == 0) ||
(flen == sizeof("is_callable")-1 && zend_binary_strcasecmp(fname, flen, "is_callable", sizeof("is_callable")-1) == 0)
) {
zend_function *function;
if(zend_hash_find(EG(function_table), Z_STRVAL_P(arg), Z_STRLEN_P(arg)+1, (void **)&function) == SUCCESS) {
literal_dtor(arg);
MAKE_NOP(sv);
MAKE_NOP(fcall);
LITERAL_BOOL(opline->op1, 1);
ZEND_OP1_TYPE(opline) = IS_CONST;
}
} else if(flen == sizeof("constant")-1 && zend_binary_strcasecmp(fname, flen, "constant", sizeof("constant")-1) == 0) {
zval c;
if(zend_get_persistent_constant(Z_STRVAL_P(arg), Z_STRLEN_P(arg), &c, 1 TSRMLS_CC ELS_CC) != 0) {
literal_dtor(arg);
MAKE_NOP(sv);
MAKE_NOP(fcall);
ZEND_OP1_LITERAL(opline) = zend_optimizer_add_literal(op_array, &c TSRMLS_CC);
/* no copy ctor - get already copied it */
ZEND_OP1_TYPE(opline) = IS_CONST;
}
} else if(flen == sizeof("extension_loaded")-1 && zend_binary_strcasecmp(fname, flen, "extension_loaded", sizeof("extension_loaded")-1) == 0) {
if(zend_hash_exists(&module_registry, Z_STRVAL_P(arg), Z_STRLEN_P(arg)+1)) {
literal_dtor(arg);
MAKE_NOP(sv);
MAKE_NOP(fcall);
LITERAL_BOOL(opline->op1, 1);
ZEND_OP1_TYPE(opline) = IS_CONST;
}
}
}
}
#endif
/* IS_EQ(TRUE, X) => BOOL(X)
* IS_EQ(FALSE, X) => BOOL_NOT(X)
* IS_NOT_EQ(TRUE, X) => BOOL_NOT(X)
* IS_NOT_EQ(FALSE, X) => BOOL(X)
*/
if (opline->opcode == ZEND_IS_EQUAL ||
opline->opcode == ZEND_IS_NOT_EQUAL) {
if (ZEND_OP1_TYPE(opline) == IS_CONST &&
Z_TYPE(ZEND_OP1_LITERAL(opline)) == IS_BOOL) {
opline->opcode =
((opline->opcode == ZEND_IS_EQUAL) == Z_LVAL(ZEND_OP1_LITERAL(opline)))?
ZEND_BOOL : ZEND_BOOL_NOT;
COPY_NODE(opline->op1, opline->op2);
SET_UNUSED(opline->op2);
} else if (ZEND_OP2_TYPE(opline) == IS_CONST &&
Z_TYPE(ZEND_OP2_LITERAL(opline)) == IS_BOOL) {
opline->opcode =
((opline->opcode == ZEND_IS_EQUAL) == Z_LVAL(ZEND_OP2_LITERAL(opline)))?
ZEND_BOOL : ZEND_BOOL_NOT;
SET_UNUSED(opline->op2);
}
}
if ((opline->opcode == ZEND_BOOL ||
opline->opcode == ZEND_BOOL_NOT ||
opline->opcode == ZEND_JMPZ ||
opline->opcode == ZEND_JMPNZ ||
opline->opcode == ZEND_JMPZNZ) &&
ZEND_OP1_TYPE(opline) == IS_TMP_VAR &&
VAR_SOURCE(opline->op1) != NULL &&
!used_ext[VAR_NUM(ZEND_OP1(opline).var)] &&
VAR_SOURCE(opline->op1)->opcode == ZEND_BOOL_NOT) {
/* T = BOOL_NOT(X) + JMPZ(T) -> NOP, JMPNZ(X) */
zend_op *src = VAR_SOURCE(opline->op1);
COPY_NODE(opline->op1, src->op1);
switch (opline->opcode) {
case ZEND_BOOL:
/* T = BOOL_NOT(X) + BOOL(T) -> NOP, BOOL_NOT(X) */
opline->opcode = ZEND_BOOL_NOT;
break;
case ZEND_BOOL_NOT:
/* T = BOOL_NOT(X) + BOOL_BOOL(T) -> NOP, BOOL(X) */
opline->opcode = ZEND_BOOL;
break;
case ZEND_JMPZ:
/* T = BOOL_NOT(X) + JMPZ(T,L) -> NOP, JMPNZ(X,L) */
opline->opcode = ZEND_JMPNZ;
break;
case ZEND_JMPNZ:
/* T = BOOL_NOT(X) + JMPNZ(T,L) -> NOP, JMPZ(X,L) */
opline->opcode = ZEND_JMPZ;
break;
case ZEND_JMPZNZ:
{
/* T = BOOL_NOT(X) + JMPZNZ(T,L1,L2) -> NOP, JMPZNZ(X,L2,L1) */
int op_t;
zend_code_block *op_b;
op_t = opline->extended_value;
opline->extended_value = ZEND_OP2(opline).opline_num;
ZEND_OP2(opline).opline_num = op_t;
op_b = block->ext_to;
block->ext_to = block->op2_to;
block->op2_to = op_b;
}
break;
}
VAR_UNSET(opline->op1);
MAKE_NOP(src);
continue;
} else
#if 0
/* T = BOOL_NOT(X) + T = JMPZ_EX(T, X) -> T = BOOL_NOT(X), JMPNZ(X) */
if(0 && (opline->opcode == ZEND_JMPZ_EX ||
opline->opcode == ZEND_JMPNZ_EX) &&
ZEND_OP1_TYPE(opline) == IS_TMP_VAR &&
VAR_SOURCE(opline->op1) != NULL &&
VAR_SOURCE(opline->op1)->opcode == ZEND_BOOL_NOT &&
ZEND_OP1(opline).var == ZEND_RESULT(opline).var
) {
zend_op *src = VAR_SOURCE(opline->op1);
if(opline->opcode == ZEND_JMPZ_EX) {
opline->opcode = ZEND_JMPNZ;
} else {
opline->opcode = ZEND_JMPZ;
}
COPY_NODE(opline->op1, src->op1);
SET_UNUSED(opline->result);
continue;
} else
#endif
/* T = BOOL(X) + JMPZ(T) -> NOP, JMPZ(X) */
if ((opline->opcode == ZEND_BOOL ||
opline->opcode == ZEND_BOOL_NOT ||
opline->opcode == ZEND_JMPZ ||
opline->opcode == ZEND_JMPZ_EX ||
opline->opcode == ZEND_JMPNZ_EX ||
opline->opcode == ZEND_JMPNZ ||
opline->opcode == ZEND_JMPZNZ) &&
ZEND_OP1_TYPE(opline) == IS_TMP_VAR &&
VAR_SOURCE(opline->op1) != NULL &&
(!used_ext[VAR_NUM(ZEND_OP1(opline).var)] ||
(ZEND_RESULT_TYPE(opline) == IS_TMP_VAR &&
ZEND_RESULT(opline).var == ZEND_OP1(opline).var)) &&
(VAR_SOURCE(opline->op1)->opcode == ZEND_BOOL ||
VAR_SOURCE(opline->op1)->opcode == ZEND_QM_ASSIGN)) {
zend_op *src = VAR_SOURCE(opline->op1);
COPY_NODE(opline->op1, src->op1);
VAR_UNSET(opline->op1);
MAKE_NOP(src);
continue;
} else if (last_op && opline->opcode == ZEND_ECHO &&
last_op->opcode == ZEND_ECHO &&
ZEND_OP1_TYPE(opline) == IS_CONST &&
Z_TYPE(ZEND_OP1_LITERAL(opline)) != IS_DOUBLE &&
ZEND_OP1_TYPE(last_op) == IS_CONST &&
Z_TYPE(ZEND_OP1_LITERAL(last_op)) != IS_DOUBLE) {
/* compress consecutive ECHO's.
* Float to string conversion may be affected by current
* locale setting.
*/
int l;
if (Z_TYPE(ZEND_OP1_LITERAL(opline)) != IS_STRING) {
convert_to_string_safe(&ZEND_OP1_LITERAL(opline));
}
if (Z_TYPE(ZEND_OP1_LITERAL(last_op)) != IS_STRING) {
convert_to_string_safe(&ZEND_OP1_LITERAL(last_op));
}
l = Z_STRLEN(ZEND_OP1_LITERAL(opline)) + Z_STRLEN(ZEND_OP1_LITERAL(last_op));
if (IS_INTERNED(Z_STRVAL(ZEND_OP1_LITERAL(last_op)))) {
char *tmp = emalloc(l + 1);
memcpy(tmp, Z_STRVAL(ZEND_OP1_LITERAL(last_op)), l + 1);
Z_STRVAL(ZEND_OP1_LITERAL(last_op)) = tmp;
} else {
Z_STRVAL(ZEND_OP1_LITERAL(last_op)) = erealloc(Z_STRVAL(ZEND_OP1_LITERAL(last_op)), l + 1);
}
memcpy(Z_STRVAL(ZEND_OP1_LITERAL(last_op))+Z_STRLEN(ZEND_OP1_LITERAL(last_op)), Z_STRVAL(ZEND_OP1_LITERAL(opline)), Z_STRLEN(ZEND_OP1_LITERAL(opline)));
Z_STRVAL(ZEND_OP1_LITERAL(last_op))[l] = '\0';
zval_dtor(&ZEND_OP1_LITERAL(opline));
#if ZEND_EXTENSION_API_NO > PHP_5_3_X_API_NO
Z_STRVAL(ZEND_OP1_LITERAL(opline)) = (char*)zend_new_interned_string(Z_STRVAL(ZEND_OP1_LITERAL(last_op)), l + 1, 1 TSRMLS_CC);
Z_TYPE(ZEND_OP1_LITERAL(last_op)) = IS_NULL;
#else
Z_STRVAL(ZEND_OP1_LITERAL(opline)) = Z_STRVAL(ZEND_OP1_LITERAL(last_op));
#endif
Z_STRLEN(ZEND_OP1_LITERAL(opline)) = l;
MAKE_NOP(last_op);
} else if (opline->opcode == ZEND_CONCAT &&
ZEND_OP2_TYPE(opline) == IS_CONST &&
ZEND_OP1_TYPE(opline) == IS_TMP_VAR &&
VAR_SOURCE(opline->op1) &&
(VAR_SOURCE(opline->op1)->opcode == ZEND_CONCAT ||
VAR_SOURCE(opline->op1)->opcode == ZEND_ADD_STRING) &&
ZEND_OP2_TYPE(VAR_SOURCE(opline->op1)) == IS_CONST &&
ZEND_RESULT(VAR_SOURCE(opline->op1)).var == ZEND_OP1(opline).var) {
/* compress consecutive CONCATs */
zend_op *src = VAR_SOURCE(opline->op1);
int l;
if (Z_TYPE(ZEND_OP2_LITERAL(opline)) != IS_STRING) {
convert_to_string_safe(&ZEND_OP2_LITERAL(opline));
}
if (Z_TYPE(ZEND_OP2_LITERAL(src)) != IS_STRING) {
convert_to_string_safe(&ZEND_OP2_LITERAL(src));
}
VAR_UNSET(opline->op1);
if (ZEND_OP1_TYPE(src) == IS_UNUSED) {
/* 5.3 may use IS_UNUSED as first argument to ZEND_ADD_... */
opline->opcode = ZEND_ADD_STRING;
}
COPY_NODE(opline->op1, src->op1);
l = Z_STRLEN(ZEND_OP2_LITERAL(opline)) + Z_STRLEN(ZEND_OP2_LITERAL(src));
if (IS_INTERNED(Z_STRVAL(ZEND_OP2_LITERAL(src)))) {
char *tmp = emalloc(l + 1);
memcpy(tmp, Z_STRVAL(ZEND_OP2_LITERAL(src)), l + 1);
Z_STRVAL(ZEND_OP2_LITERAL(src)) = tmp;
} else {
Z_STRVAL(ZEND_OP2_LITERAL(src)) = erealloc(Z_STRVAL(ZEND_OP2_LITERAL(src)), l + 1);
}
memcpy(Z_STRVAL(ZEND_OP2_LITERAL(src))+Z_STRLEN(ZEND_OP2_LITERAL(src)), Z_STRVAL(ZEND_OP2_LITERAL(opline)), Z_STRLEN(ZEND_OP2_LITERAL(opline)));
Z_STRVAL(ZEND_OP2_LITERAL(src))[l] = '\0';
if (!IS_INTERNED(Z_STRVAL(ZEND_OP2_LITERAL(opline)))) {
efree(Z_STRVAL(ZEND_OP2_LITERAL(opline)));
}
#if ZEND_EXTENSION_API_NO > PHP_5_3_X_API_NO
Z_STRVAL(ZEND_OP2_LITERAL(opline)) = (char*)zend_new_interned_string(Z_STRVAL(ZEND_OP2_LITERAL(src)), l + 1, 1 TSRMLS_CC);
Z_TYPE(ZEND_OP2_LITERAL(src)) = IS_NULL;
#else
Z_STRVAL(ZEND_OP2_LITERAL(opline)) = Z_STRVAL(ZEND_OP2_LITERAL(src));
#endif
Z_STRLEN(ZEND_OP2_LITERAL(opline)) = l;
MAKE_NOP(src);
} else if ((opline->opcode == ZEND_ADD_STRING || opline->opcode == ZEND_ADD_VAR) && ZEND_OP1_TYPE(opline) == IS_CONST) {
/* convert ADD_STRING(C1, C2) to CONCAT(C1, C2) */
opline->opcode = ZEND_CONCAT;
continue;
} else if (opline->opcode == ZEND_ADD_CHAR && ZEND_OP1_TYPE(opline) == IS_CONST && ZEND_OP2_TYPE(opline) == IS_CONST) {
/* convert ADD_CHAR(C1, C2) to CONCAT(C1, C2) */
char c = (char)Z_LVAL(ZEND_OP2_LITERAL(opline));
ZVAL_STRINGL(&ZEND_OP2_LITERAL(opline), &c, 1, 1);
opline->opcode = ZEND_CONCAT;
continue;
} else if ((opline->opcode == ZEND_ADD ||
opline->opcode == ZEND_SUB ||
opline->opcode == ZEND_MUL ||
opline->opcode == ZEND_DIV ||
opline->opcode == ZEND_MOD ||
opline->opcode == ZEND_SL ||
opline->opcode == ZEND_SR ||
opline->opcode == ZEND_CONCAT ||
opline->opcode == ZEND_IS_EQUAL ||
opline->opcode == ZEND_IS_NOT_EQUAL ||
opline->opcode == ZEND_IS_SMALLER ||
opline->opcode == ZEND_IS_SMALLER_OR_EQUAL ||
opline->opcode == ZEND_IS_IDENTICAL ||
opline->opcode == ZEND_IS_NOT_IDENTICAL ||
opline->opcode == ZEND_BOOL_XOR ||
opline->opcode == ZEND_BW_OR ||
opline->opcode == ZEND_BW_AND ||
opline->opcode == ZEND_BW_XOR) &&
ZEND_OP1_TYPE(opline)==IS_CONST &&
ZEND_OP2_TYPE(opline)==IS_CONST) {
/* evaluate constant expressions */
int (*binary_op)(zval *result, zval *op1, zval *op2 TSRMLS_DC) = get_binary_op(opline->opcode);
zval result;
int er;
if ((opline->opcode == ZEND_DIV || opline->opcode == ZEND_MOD) &&
((Z_TYPE(ZEND_OP2_LITERAL(opline)) == IS_LONG &&
Z_LVAL(ZEND_OP2_LITERAL(opline)) == 0) ||
(Z_TYPE(ZEND_OP2_LITERAL(opline)) == IS_DOUBLE &&
Z_DVAL(ZEND_OP2_LITERAL(opline)) == 0.0))) {
if (RESULT_USED(opline)) {
SET_VAR_SOURCE(opline);
}
opline++;
continue;
}
er = EG(error_reporting);
EG(error_reporting) = 0;
if (binary_op(&result, &ZEND_OP1_LITERAL(opline), &ZEND_OP2_LITERAL(opline) TSRMLS_CC) == SUCCESS) {
PZ_SET_REFCOUNT_P(&result, 1);
PZ_UNSET_ISREF_P(&result);
literal_dtor(&ZEND_OP1_LITERAL(opline));
literal_dtor(&ZEND_OP2_LITERAL(opline));
opline->opcode = ZEND_QM_ASSIGN;
SET_UNUSED(opline->op2);
update_op1_const(op_array, opline, &result TSRMLS_CC);
}
EG(error_reporting) = er;
} else if ((opline->opcode == ZEND_BOOL ||
opline->opcode == ZEND_BOOL_NOT ||
opline->opcode == ZEND_BW_NOT) && ZEND_OP1_TYPE(opline) == IS_CONST) {
/* evaluate constant unary ops */
unary_op_type unary_op = get_unary_op(opline->opcode);
zval result;
if (unary_op) {
#if ZEND_EXTENSION_API_NO < PHP_5_3_X_API_NO
unary_op(&result, &ZEND_OP1_LITERAL(opline));
#else
unary_op(&result, &ZEND_OP1_LITERAL(opline) TSRMLS_CC);
#endif
literal_dtor(&ZEND_OP1_LITERAL(opline));
} else {
/* BOOL */
result = ZEND_OP1_LITERAL(opline);
convert_to_boolean(&result);
}
PZ_SET_REFCOUNT_P(&result, 1);
PZ_UNSET_ISREF_P(&result);
opline->opcode = ZEND_QM_ASSIGN;
update_op1_const(op_array, opline, &result TSRMLS_CC);
} else if ((opline->opcode == ZEND_RETURN || opline->opcode == ZEND_EXIT) &&
ZEND_OP1_TYPE(opline) == IS_TMP_VAR &&
VAR_SOURCE(opline->op1) &&
VAR_SOURCE(opline->op1)->opcode == ZEND_QM_ASSIGN) {
/* T = QM_ASSIGN(X), RETURN(T) to RETURN(X) */
zend_op *src = VAR_SOURCE(opline->op1);
VAR_UNSET(opline->op1);
COPY_NODE(opline->op1, src->op1);
MAKE_NOP(src);
} else if ((opline->opcode == ZEND_ADD_STRING ||
opline->opcode == ZEND_ADD_CHAR) &&
ZEND_OP1_TYPE(opline) == IS_TMP_VAR &&
VAR_SOURCE(opline->op1) &&
VAR_SOURCE(opline->op1)->opcode == ZEND_INIT_STRING) {
/* convert T = INIT_STRING(), T = ADD_STRING(T, X) to T = QM_ASSIGN(X) */
/* CHECKME: Remove ZEND_ADD_VAR optimization, since some conversions -
namely, BOOL(false)->string - don't allocate memory but use empty_string
and ADD_CHAR fails */
zend_op *src = VAR_SOURCE(opline->op1);
VAR_UNSET(opline->op1);
COPY_NODE(opline->op1, opline->op2);
if (opline->opcode == ZEND_ADD_CHAR) {
char c = (char)Z_LVAL(ZEND_OP2_LITERAL(opline));
ZVAL_STRINGL(&ZEND_OP1_LITERAL(opline), &c, 1, 1);
}
SET_UNUSED(opline->op2);
MAKE_NOP(src);
opline->opcode = ZEND_QM_ASSIGN;
} else if ((opline->opcode == ZEND_ADD_STRING ||
opline->opcode == ZEND_ADD_CHAR ||
opline->opcode == ZEND_ADD_VAR ||
opline->opcode == ZEND_CONCAT) &&
ZEND_OP1_TYPE(opline) == IS_TMP_VAR &&
VAR_SOURCE(opline->op1) &&
VAR_SOURCE(opline->op1)->opcode == ZEND_CONCAT &&
ZEND_OP2_TYPE(VAR_SOURCE(opline->op1)) == IS_CONST &&
Z_TYPE(ZEND_OP2_LITERAL(VAR_SOURCE(opline->op1))) == IS_STRING &&
Z_STRLEN(ZEND_OP2_LITERAL(VAR_SOURCE(opline->op1))) == 0) {
/* convert T = CONCAT(X,''), T = ADD_STRING(T, Y) to T = CONCAT(X,Y) */
zend_op *src = VAR_SOURCE(opline->op1);
VAR_UNSET(opline->op1);
COPY_NODE(opline->op1, src->op1);
if (opline->opcode == ZEND_ADD_CHAR) {
char c = (char)Z_LVAL(ZEND_OP2_LITERAL(opline));
ZVAL_STRINGL(&ZEND_OP2_LITERAL(opline), &c, 1, 1);
}
opline->opcode = ZEND_CONCAT;
literal_dtor(&ZEND_OP2_LITERAL(src)); /* will take care of empty_string too */
MAKE_NOP(src);
} else if (opline->opcode == ZEND_ADD_VAR &&
ZEND_OP1_TYPE(opline) == IS_TMP_VAR &&
VAR_SOURCE(opline->op1) &&
VAR_SOURCE(opline->op1)->opcode == ZEND_INIT_STRING) {
/* convert T = INIT_STRING(), T = ADD_VAR(T, X) to T = CAST(STRING, X) */
zend_op *src = VAR_SOURCE(opline->op1);
VAR_UNSET(opline->op1);
COPY_NODE(opline->op1, opline->op2);
SET_UNUSED(opline->op2);
MAKE_NOP(src);
opline->opcode = ZEND_CAST;
opline->extended_value = IS_STRING;
} else if ((opline->opcode == ZEND_ADD_STRING ||
opline->opcode == ZEND_ADD_CHAR ||
opline->opcode == ZEND_ADD_VAR ||
opline->opcode == ZEND_CONCAT) &&
ZEND_OP1_TYPE(opline) == IS_TMP_VAR &&
VAR_SOURCE(opline->op1) &&
VAR_SOURCE(opline->op1)->opcode == ZEND_CAST &&
VAR_SOURCE(opline->op1)->extended_value == IS_STRING) {
/* convert T1 = CAST(STRING, X), T2 = CONCAT(T1, Y) to T2 = CONCAT(X,Y) */
zend_op *src = VAR_SOURCE(opline->op1);
VAR_UNSET(opline->op1);
COPY_NODE(opline->op1, src->op1);
if (opline->opcode == ZEND_ADD_CHAR) {
char c = (char)Z_LVAL(ZEND_OP2_LITERAL(opline));
ZVAL_STRINGL(&ZEND_OP2_LITERAL(opline), &c, 1, 1);
}
opline->opcode = ZEND_CONCAT;
MAKE_NOP(src);
} else if (opline->opcode == ZEND_QM_ASSIGN &&
ZEND_OP1_TYPE(opline) == IS_TMP_VAR &&
ZEND_RESULT_TYPE(opline) == IS_TMP_VAR &&
ZEND_OP1(opline).var == ZEND_RESULT(opline).var) {
/* strip T = QM_ASSIGN(T) */
MAKE_NOP(opline);
} else if (opline->opcode == ZEND_BOOL &&
ZEND_OP1_TYPE(opline) == IS_TMP_VAR &&
VAR_SOURCE(opline->op1) &&
(VAR_SOURCE(opline->op1)->opcode == ZEND_IS_EQUAL ||
VAR_SOURCE(opline->op1)->opcode == ZEND_IS_NOT_EQUAL ||
VAR_SOURCE(opline->op1)->opcode == ZEND_IS_SMALLER ||
VAR_SOURCE(opline->op1)->opcode == ZEND_IS_SMALLER_OR_EQUAL ||
VAR_SOURCE(opline->op1)->opcode == ZEND_BOOL ||
VAR_SOURCE(opline->op1)->opcode == ZEND_IS_IDENTICAL ||
VAR_SOURCE(opline->op1)->opcode == ZEND_IS_NOT_IDENTICAL ||
VAR_SOURCE(opline->op1)->opcode == ZEND_ISSET_ISEMPTY_VAR ||
VAR_SOURCE(opline->op1)->opcode == ZEND_ISSET_ISEMPTY_DIM_OBJ) &&
!used_ext[VAR_NUM(ZEND_OP1(opline).var)]) {
/* T = IS_SMALLER(X, Y), T1 = BOOL(T) => T = IS_SMALLER(X, Y), T1 = QM_ASSIGN(T) */
zend_op *src = VAR_SOURCE(opline->op1);
COPY_NODE(src->result, opline->result);
SET_VAR_SOURCE(src);
MAKE_NOP(opline);
}
/* get variable source */
if (RESULT_USED(opline)) {
SET_VAR_SOURCE(opline);
}
if (opline->opcode != ZEND_NOP) {
last_op = opline;
}
opline++;
}
strip_nop(block);
if (op_array->T) {
efree(Tsource);
}
}
/* Rebuild plain (optimized) op_array from CFG */
static void assemble_code_blocks(zend_cfg *cfg, zend_op_array *op_array)
{
zend_code_block *blocks = cfg->blocks;
zend_op *new_opcodes = emalloc(op_array->last * sizeof(zend_op));
zend_op *opline = new_opcodes;
zend_code_block *cur_block = blocks;
/* Copy code of reachable blocks into a single buffer */
while (cur_block) {
if (cur_block->access) {
memcpy(opline, cur_block->start_opline, cur_block->len * sizeof(zend_op));
cur_block->start_opline = opline;
opline += cur_block->len;
if ((opline - 1)->opcode == ZEND_JMP) {
zend_code_block *next;
next = cur_block->next;
while (next && !next->access) {
next = next->next;
}
if (next && next == cur_block->op1_to) {
/* JMP to the next block - strip it */
cur_block->follow_to = cur_block->op1_to;
cur_block->op1_to = NULL;
MAKE_NOP((opline - 1));
opline--;
cur_block->len--;
}
}
} else {
/* this block will not be used, delete all constants there */
zend_op *_opl;
zend_op *end = cur_block->start_opline + cur_block->len;
for (_opl = cur_block->start_opline; _opl && _opl < end; _opl++) {
if (ZEND_OP1_TYPE(_opl) == IS_CONST) {
literal_dtor(&ZEND_OP1_LITERAL(_opl));
}
if (ZEND_OP2_TYPE(_opl) == IS_CONST) {
literal_dtor(&ZEND_OP2_LITERAL(_opl));
}
}
}
cur_block = cur_block->next;
}
if ((opline-1)->opcode == ZEND_THROW) {
/* if we finished with THROW, we need to add space between THROW and HANDLE to not confuse
zend_throw_internal */
MAKE_NOP(opline);
opline->lineno = opline[-1].lineno;
opline++;
}
#if ZEND_EXTENSION_API_NO < PHP_5_3_X_API_NO
MAKE_NOP(opline);
opline->opcode = ZEND_HANDLE_EXCEPTION;
opline->lineno = opline[-1].lineno;
opline++;
#endif
op_array->last = opline-new_opcodes;
/* adjust exception jump targets */
if (op_array->last_try_catch) {
int i, j;
for (i = 0, j = 0; i< op_array->last_try_catch; i++) {
if (cfg->try[i]->access) {
op_array->try_catch_array[j].try_op = cfg->try[i]->start_opline - new_opcodes;
op_array->try_catch_array[j].catch_op = cfg->catch[i]->start_opline - new_opcodes;
j++;
}
}
op_array->last_try_catch = j;
efree(cfg->try);
efree(cfg->catch);
}
/* adjust loop jump targets */
if (op_array->last_brk_cont) {
int i;
for (i = 0; i< op_array->last_brk_cont; i++) {
op_array->brk_cont_array[i].start = cfg->loop_start[i]->start_opline - new_opcodes;
op_array->brk_cont_array[i].cont = cfg->loop_cont[i]->start_opline - new_opcodes;
op_array->brk_cont_array[i].brk = cfg->loop_brk[i]->start_opline - new_opcodes;
}
efree(cfg->loop_start);
efree(cfg->loop_cont);
efree(cfg->loop_brk);
}
/* adjust jump targets */
for (cur_block = blocks; cur_block; cur_block = cur_block->next) {
if (!cur_block->access) {
continue;
}
opline = cur_block->start_opline + cur_block->len - 1;
if (opline->opcode == ZEND_OP_DATA) {
opline--;
}
if (cur_block->op1_to) {
ZEND_OP1(opline).opline_num = cur_block->op1_to->start_opline - new_opcodes;
}
if (cur_block->op2_to) {
ZEND_OP2(opline).opline_num = cur_block->op2_to->start_opline - new_opcodes;
}
if (cur_block->ext_to) {
opline->extended_value = cur_block->ext_to->start_opline - new_opcodes;
}
print_block(cur_block, new_opcodes, "Out ");
}
efree(op_array->opcodes);
op_array->opcodes = erealloc(new_opcodes, op_array->last * sizeof(zend_op));
#if ZEND_EXTENSION_API_NO >= PHP_5_3_X_API_NO
/* adjust early binding list */
if (op_array->early_binding != (zend_uint)-1) {
zend_uint *opline_num = &op_array->early_binding;
zend_op *end;
opline = op_array->opcodes;
end = opline + op_array->last;
while (opline < end) {
if (opline->opcode == ZEND_DECLARE_INHERITED_CLASS_DELAYED) {
*opline_num = opline - op_array->opcodes;
opline_num = &ZEND_RESULT(opline).opline_num;
}
++opline;
}
*opline_num = -1;
}
#endif
}
static void zend_jmp_optimization(zend_code_block *block, zend_op_array *op_array, zend_code_block *blocks TSRMLS_DC)
{
/* last_op is the last opcode of the current block */
zend_op *last_op = (block->start_opline + block->len - 1);
if (!block->len) {
return;
}
switch (last_op->opcode) {
case ZEND_JMP:
{
zend_op *target = block->op1_to->start_opline;
zend_code_block *next = block->next;
while (next && !next->access) {
/* find used one */
next = next->next;
}
/* JMP(next) -> NOP */
if (block->op1_to == next) {
block->follow_to = block->op1_to;
block->op1_to = NULL;
MAKE_NOP(last_op);
block->len--;
if (block->len == 0) {
/* this block is nothing but NOP now */
delete_code_block(block);
}
break;
}
if (((target->opcode == ZEND_JMP &&
block->op1_to != block->op1_to->op1_to) ||
target->opcode == ZEND_JMPZNZ) &&
!block->op1_to->protected) {
/* JMP L, L: JMP L1 -> JMP L1 */
/* JMP L, L: JMPZNZ L1,L2 -> JMPZNZ L1,L2 */
*last_op = *target;
#if ZEND_EXTENSION_API_NO < PHP_5_4_X_API_NO
if (ZEND_OP1_TYPE(last_op) == IS_CONST) {
zval_copy_ctor(&ZEND_OP1_LITERAL(last_op));
}
#else
if (ZEND_OP1_TYPE(last_op) == IS_CONST) {
zval zv = ZEND_OP1_LITERAL(last_op);
zval_copy_ctor(&zv);
last_op->op1.constant = zend_optimizer_add_literal(op_array, &zv TSRMLS_CC);
}
#endif
del_source(block, block->op1_to);
if (block->op1_to->op2_to) {
block->op2_to = block->op1_to->op2_to;
ADD_SOURCE(block, block->op2_to);
}
if (block->op1_to->ext_to) {
block->ext_to = block->op1_to->ext_to;
ADD_SOURCE(block, block->ext_to);
}
if (block->op1_to->op1_to) {
block->op1_to = block->op1_to->op1_to;
ADD_SOURCE(block, block->op1_to);
} else {
block->op1_to = NULL;
}
} else if (target->opcode == ZEND_RETURN ||
#if ZEND_EXTENSION_API_NO > PHP_5_3_X_API_NO
target->opcode == ZEND_RETURN_BY_REF ||
#endif
#if ZEND_EXTENSION_API_NO > PHP_5_4_X_API_NO
target->opcode == ZEND_FAST_RET ||
#endif
target->opcode == ZEND_EXIT) {
/* JMP L, L: RETURN to immediate RETURN */
*last_op = *target;
#if ZEND_EXTENSION_API_NO < PHP_5_4_X_API_NO
if (ZEND_OP1_TYPE(last_op) == IS_CONST) {
zval_copy_ctor(&ZEND_OP1_LITERAL(last_op));
}
#else
if (ZEND_OP1_TYPE(last_op) == IS_CONST) {
zval zv = ZEND_OP1_LITERAL(last_op);
zval_copy_ctor(&zv);
last_op->op1.constant = zend_optimizer_add_literal(op_array, &zv TSRMLS_CC);
}
#endif
del_source(block, block->op1_to);
block->op1_to = NULL;
#if 0
/* Temporarily disabled - see bug #0025274 */
} else if (0&& block->op1_to != block &&
block->op1_to != blocks &&
op_array->last_try_catch == 0 &&
target->opcode != ZEND_FREE &&
target->opcode != ZEND_SWITCH_FREE) {
/* Block Reordering (saves one JMP on each "for" loop iteration)
* It is disabled for some cases (ZEND_FREE/ZEND_SWITCH_FREE)
* which may break register allocation.
*/
zend_bool can_reorder = 0;
zend_block_source *cs = block->op1_to->sources;
/* the "target" block doesn't had any followed block */
while(cs) {
if (cs->from->follow_to == block->op1_to) {
can_reorder = 0;
break;
}
cs = cs->next;
}
if (can_reorder) {
next = block->op1_to;
/* the "target" block is not followed by current "block" */
while (next->follow_to != NULL) {
if (next->follow_to == block) {
can_reorder = 0;
break;
}
next = next->follow_to;
}
if (can_reorder) {
zend_code_block *prev = blocks;
while (prev->next != block->op1_to) {
prev = prev->next;
}
prev->next = next->next;
next->next = block->next;
block->next = block->op1_to;
block->follow_to = block->op1_to;
block->op1_to = NULL;
MAKE_NOP(last_op);
block->len--;
if(block->len == 0) {
/* this block is nothing but NOP now */
delete_code_block(block);
}
break;
}
}
#endif
}
}
break;
case ZEND_JMPZ:
case ZEND_JMPNZ:
/* constant conditional JMPs */
if (ZEND_OP1_TYPE(last_op) == IS_CONST) {
int should_jmp = zend_is_true(&ZEND_OP1_LITERAL(last_op));
if (last_op->opcode == ZEND_JMPZ) {
should_jmp = !should_jmp;
}
literal_dtor(&ZEND_OP1_LITERAL(last_op));
ZEND_OP1_TYPE(last_op) = IS_UNUSED;
if (should_jmp) {
/* JMPNZ(true) -> JMP */
last_op->opcode = ZEND_JMP;
COPY_NODE(last_op->op1, last_op->op2);
block->op1_to = block->op2_to;
del_source(block, block->follow_to);
block->op2_to = NULL;
block->follow_to = NULL;
} else {
/* JMPNZ(false) -> NOP */
MAKE_NOP(last_op);
del_source(block, block->op2_to);
block->op2_to = NULL;
}
break;
}
if (block->op2_to) {
zend_uchar same_type = ZEND_OP1_TYPE(last_op);
zend_uint same_var = VAR_NUM_EX(last_op->op1);
zend_op *target;
zend_op *target_end;
zend_code_block *target_block = block->op2_to;;
next_target:
target = target_block->start_opline;
target_end = target_block->start_opline + target_block->len;
while (target < target_end && target->opcode == ZEND_NOP) {
target++;
}
/* next block is only NOP's */
if (target == target_end) {
target_block = target_block->follow_to;
goto next_target;
} else if (target->opcode == INV_COND(last_op->opcode) &&
/* JMPZ(X, L), L: JMPNZ(X, L2) -> JMPZ(X, L+1) */
(ZEND_OP1_TYPE(target) & (IS_TMP_VAR|IS_CV)) &&
same_type == ZEND_OP1_TYPE(target) &&
same_var == VAR_NUM_EX(target->op1) &&
target_block->follow_to &&
!target_block->protected
) {
del_source(block, block->op2_to);
block->op2_to = target_block->follow_to;
ADD_SOURCE(block, block->op2_to);
} else if (target->opcode == INV_COND_EX(last_op->opcode) &&
(ZEND_OP1_TYPE(target) & (IS_TMP_VAR|IS_CV)) &&
same_type == ZEND_OP1_TYPE(target) &&
same_var == VAR_NUM_EX(target->op1) &&
target_block->follow_to &&
!target_block->protected) {
/* JMPZ(X, L), L: X = JMPNZ_EX(X, L2) -> JMPZ(X, L+1) */
last_op->opcode += 3;
last_op->result = target->result;
del_source(block, block->op2_to);
block->op2_to = target_block->follow_to;
ADD_SOURCE(block, block->op2_to);
} else if (target_block->op2_to &&
target->opcode == last_op->opcode &&
(ZEND_OP1_TYPE(target) & (IS_TMP_VAR|IS_CV)) &&
same_type == ZEND_OP1_TYPE(target) &&
same_var == VAR_NUM_EX(target->op1) &&
!target_block->protected) {
/* JMPZ(X, L), L: JMPZ(X, L2) -> JMPZ(X, L2) */
del_source(block, block->op2_to);
block->op2_to = target_block->op2_to;
ADD_SOURCE(block, block->op2_to);
} else if (target_block->op1_to &&
target->opcode == ZEND_JMP &&
!target_block->protected) {
/* JMPZ(X, L), L: JMP(L2) -> JMPZ(X, L2) */
del_source(block, block->op2_to);
block->op2_to = target_block->op1_to;
ADD_SOURCE(block, block->op2_to);
} else if (target_block->op2_to &&
target_block->ext_to &&
target->opcode == ZEND_JMPZNZ &&
(ZEND_OP1_TYPE(target) & (IS_TMP_VAR|IS_CV)) &&
same_type == ZEND_OP1_TYPE(target) &&
same_var == VAR_NUM_EX(target->op1) &&
!target_block->protected) {
/* JMPZ(X, L), L: JMPZNZ(X, L2, L3) -> JMPZ(X, L2) */
del_source(block, block->op2_to);
if (last_op->opcode == ZEND_JMPZ) {
block->op2_to = target_block->op2_to;
} else {
block->op2_to = target_block->ext_to;
}
ADD_SOURCE(block, block->op2_to);
}
}
if (block->follow_to &&
(last_op->opcode == ZEND_JMPZ || last_op->opcode == ZEND_JMPNZ)) {
zend_op *target;
zend_op *target_end;
while (1) {
target = block->follow_to->start_opline;
target_end = block->follow_to->start_opline + block->follow_to->len;
while (target < target_end && target->opcode == ZEND_NOP) {
target++;
}
/* next block is only NOP's */
if (target == target_end) {
del_source(block, block->follow_to);
block->follow_to = block->follow_to->follow_to;
ADD_SOURCE(block, block->follow_to);
} else {
break;
}
}
/* JMPZ(X,L1), JMP(L2) -> JMPZNZ(X,L1,L2) */
if (target->opcode == ZEND_JMP &&
block->follow_to->op1_to &&
!block->follow_to->protected) {
del_source(block, block->follow_to);
if (last_op->opcode == ZEND_JMPZ) {
block->ext_to = block->follow_to->op1_to;
ADD_SOURCE(block, block->ext_to);
} else {
block->ext_to = block->op2_to;
block->op2_to = block->follow_to->op1_to;
ADD_SOURCE(block, block->op2_to);
}
block->follow_to = NULL;
last_op->opcode = ZEND_JMPZNZ;
}
}
break;
case ZEND_JMPNZ_EX:
case ZEND_JMPZ_EX:
/* constant conditional JMPs */
if (ZEND_OP1_TYPE(last_op) == IS_CONST) {
int should_jmp = zend_is_true(&ZEND_OP1_LITERAL(last_op));
if (last_op->opcode == ZEND_JMPZ_EX) {
should_jmp = !should_jmp;
}
if (!should_jmp) {
/* T = JMPZ_EX(true,L) -> T = QM_ASSIGN(true)
* T = JMPNZ_EX(false,L) -> T = QM_ASSIGN(false)
*/
last_op->opcode = ZEND_QM_ASSIGN;
SET_UNUSED(last_op->op2);
del_source(block, block->op2_to);
block->op2_to = NULL;
}
break;
}
if (block->op2_to) {
zend_op *target, *target_end;
char *same_t=NULL;
zend_code_block *target_block;
int var_num = 0;
if (op_array->T >= (zend_uint)op_array->last_var) {
var_num = op_array->T;
} else {
var_num = op_array->last_var;
}
if (var_num <= 0) {
return;
}
same_t = ecalloc(var_num, sizeof(char));
if (same_t == NULL) {
return;
}
same_t[VAR_NUM_EX(last_op->op1)] |= ZEND_OP1_TYPE(last_op);
same_t[VAR_NUM_EX(last_op->result)] |= ZEND_RESULT_TYPE(last_op);
target_block = block->op2_to;
next_target_ex:
target = target_block->start_opline;
target_end = target_block->start_opline + target_block->len;
while (target < target_end && target->opcode == ZEND_NOP) {
target++;
}
/* next block is only NOP's */
if (target == target_end) {
target_block = target_block->follow_to;
goto next_target_ex;
} else if (target_block->op2_to &&
target->opcode == last_op->opcode-3 &&
(ZEND_OP1_TYPE(target) & (IS_TMP_VAR|IS_CV)) &&
(same_t[VAR_NUM_EX(target->op1)] & ZEND_OP1_TYPE(target)) != 0 &&
!target_block->protected) {
/* T = JMPZ_EX(X, L1), L1: JMPZ({X|T}, L2) -> T = JMPZ_EX(X, L2) */
del_source(block, block->op2_to);
block->op2_to = target_block->op2_to;
ADD_SOURCE(block, block->op2_to);
} else if (target_block->op2_to &&
target->opcode == INV_EX_COND(last_op->opcode) &&
(ZEND_OP1_TYPE(target) & (IS_TMP_VAR|IS_CV)) &&
(same_t[VAR_NUM_EX(target->op1)] & ZEND_OP1_TYPE(target)) != 0 &&
!target_block->protected) {
/* T = JMPZ_EX(X, L1), L1: JMPNZ({X|T1}, L2) -> T = JMPZ_EX(X, L1+1) */
del_source(block, block->op2_to);
block->op2_to = target_block->follow_to;
ADD_SOURCE(block, block->op2_to);
} else if (target_block->op2_to &&
target->opcode == INV_EX_COND_EX(last_op->opcode) &&
(ZEND_OP1_TYPE(target) & (IS_TMP_VAR|IS_CV)) &&
(same_t[VAR_NUM_EX(target->op1)] & ZEND_OP1_TYPE(target)) != 0 &&
(same_t[VAR_NUM_EX(target->result)] & ZEND_RESULT_TYPE(target)) != 0 &&
!target_block->protected) {
/* T = JMPZ_EX(X, L1), L1: T = JMPNZ_EX(T, L2) -> T = JMPZ_EX(X, L1+1) */
del_source(block, block->op2_to);
block->op2_to = target_block->follow_to;
ADD_SOURCE(block, block->op2_to);
} else if (target_block->op2_to &&
target->opcode == last_op->opcode &&
(ZEND_OP1_TYPE(target) & (IS_TMP_VAR|IS_CV)) &&
(same_t[VAR_NUM_EX(target->op1)] & ZEND_OP1_TYPE(target)) != 0 &&
(same_t[VAR_NUM_EX(target->result)] & ZEND_RESULT_TYPE(target)) != 0 &&
!target_block->protected) {
/* T = JMPZ_EX(X, L1), L1: T = JMPZ({X|T}, L2) -> T = JMPZ_EX(X, L2) */
del_source(block, block->op2_to);
block->op2_to = target_block->op2_to;
ADD_SOURCE(block, block->op2_to);
} else if (target_block->op1_to &&
target->opcode == ZEND_JMP &&
!target_block->protected) {
/* T = JMPZ_EX(X, L), L: JMP(L2) -> T = JMPZ(X, L2) */
del_source(block, block->op2_to);
block->op2_to = target_block->op1_to;
ADD_SOURCE(block, block->op2_to);
} else if (target_block->op2_to &&
target_block->ext_to &&
target->opcode == ZEND_JMPZNZ &&
(ZEND_OP1_TYPE(target) & (IS_TMP_VAR|IS_CV)) &&
(same_t[VAR_NUM_EX(target->op1)] & ZEND_OP1_TYPE(target)) != 0 &&
!target_block->protected) {
/* T = JMPZ_EX(X, L), L: JMPZNZ({X|T}, L2, L3) -> T = JMPZ_EX(X, L2) */
del_source(block, block->op2_to);
if (last_op->opcode == ZEND_JMPZ_EX) {
block->op2_to = target_block->op2_to;
} else {
block->op2_to = target_block->ext_to;
}
ADD_SOURCE(block, block->op2_to);
}
if (same_t != NULL) {
efree(same_t);
}
}
break;
case ZEND_JMPZNZ: {
zend_code_block *next = block->next;
while (next && !next->access) {
/* find first accessed one */
next = next->next;
}
if (ZEND_OP1_TYPE(last_op) == IS_CONST) {
if (!zend_is_true(&ZEND_OP1_LITERAL(last_op))) {
/* JMPZNZ(false,L1,L2) -> JMP(L1) */
zend_code_block *todel;
literal_dtor(&ZEND_OP1_LITERAL(last_op));
last_op->opcode = ZEND_JMP;
SET_UNUSED(last_op->op1);
SET_UNUSED(last_op->op2);
block->op1_to = block->op2_to;
todel = block->ext_to;
block->op2_to = NULL;
block->ext_to = NULL;
del_source(block, todel);
} else {
/* JMPZNZ(true,L1,L2) -> JMP(L2) */
zend_code_block *todel;
literal_dtor(&ZEND_OP1_LITERAL(last_op));
last_op->opcode = ZEND_JMP;
SET_UNUSED(last_op->op1);
SET_UNUSED(last_op->op2);
block->op1_to = block->ext_to;
todel = block->op2_to;
block->op2_to = NULL;
block->ext_to = NULL;
del_source(block, todel);
}
} else if (block->op2_to == block->ext_to) {
/* both goto the same one - it's JMP */
/* JMPZNZ(?,L,L) -> JMP(L) */
last_op->opcode = ZEND_JMP;
SET_UNUSED(last_op->op1);
SET_UNUSED(last_op->op2);
block->op1_to = block->op2_to;
block->op2_to = NULL;
block->ext_to = NULL;
} else if (block->op2_to == next) {
/* jumping to next on Z - can follow to it and jump only on NZ */
/* JMPZNZ(X,L1,L2) L1: -> JMPNZ(X,L2) */
last_op->opcode = ZEND_JMPNZ;
block->op2_to = block->ext_to;
block->follow_to = next;
block->ext_to = NULL;
/* no need to add source - it's block->op2_to */
} else if (block->ext_to == next) {
/* jumping to next on NZ - can follow to it and jump only on Z */
/* JMPZNZ(X,L1,L2) L2: -> JMPZ(X,L1) */
last_op->opcode = ZEND_JMPZ;
block->follow_to = next;
block->ext_to = NULL;
/* no need to add source - it's block->ext_to */
}
if (last_op->opcode == ZEND_JMPZNZ && block->op2_to) {
zend_uchar same_type = ZEND_OP1_TYPE(last_op);
zend_uchar same_var = VAR_NUM_EX(last_op->op1);
zend_op *target;
zend_op *target_end;
zend_code_block *target_block = block->op2_to;
next_target_znz:
target = target_block->start_opline;
target_end = target_block->start_opline + target_block->len;
while (target < target_end && target->opcode == ZEND_NOP) {
target++;
}
/* next block is only NOP's */
if (target == target_end) {
target_block = target_block->follow_to;
goto next_target_znz;
} else if (target_block->op2_to &&
(target->opcode == ZEND_JMPZ || target->opcode == ZEND_JMPZNZ) &&
(ZEND_OP1_TYPE(target) & (IS_TMP_VAR|IS_CV)) &&
same_type == ZEND_OP1_TYPE(target) &&
same_var == VAR_NUM_EX(target->op1) &&
!target_block->protected) {
/* JMPZNZ(X, L1, L2), L1: JMPZ(X, L3) -> JMPZNZ(X, L3, L2) */
del_source(block, block->op2_to);
block->op2_to = target_block->op2_to;
ADD_SOURCE(block, block->op2_to);
} else if (target->opcode == ZEND_JMPNZ &&
(ZEND_OP1_TYPE(target) & (IS_TMP_VAR|IS_CV)) &&
same_type == ZEND_OP1_TYPE(target) &&
same_var == VAR_NUM_EX(target->op1) &&
target_block->follow_to &&
!target_block->protected) {
/* JMPZNZ(X, L1, L2), L1: X = JMPNZ(X, L3) -> JMPZNZ(X, L1+1, L2) */
del_source(block, block->op2_to);
block->op2_to = target_block->follow_to;
ADD_SOURCE(block, block->op2_to);
} else if (target_block->op1_to &&
target->opcode == ZEND_JMP &&
!target_block->protected) {
/* JMPZNZ(X, L1, L2), L1: JMP(L3) -> JMPZNZ(X, L3, L2) */
del_source(block, block->op2_to);
block->op2_to = target_block->op1_to;
ADD_SOURCE(block, block->op2_to);
}
}
break;
}
}
}
/* Global data dependencies */
#if ZEND_EXTENSION_API_NO > PHP_5_3_X_API_NO
# define T_USAGE(op) do { \
if ((op ## _type & (IS_VAR | IS_TMP_VAR)) && \
!defined_here[VAR_NUM(op.var)] && !used_ext[VAR_NUM(op.var)]) { \
used_ext[VAR_NUM(op.var)] = 1; \
} \
} while (0)
# define NEVER_USED(op) ((op ## _type & (IS_VAR | IS_TMP_VAR)) && !usage[VAR_NUM(op.var)]) /* !used_ext[op.var] && */
# define RES_NEVER_USED(opline) (opline->result_type == IS_UNUSED || NEVER_USED(opline->result))
#else
# define T_USAGE(op) do { \
if ((op.op_type == IS_VAR || op.op_type == IS_TMP_VAR) && \
!defined_here[VAR_NUM(op.u.var)] && !used_ext[VAR_NUM(op.u.var)]) { \
used_ext[VAR_NUM(op.u.var)] = 1; \
} \
} while (0)
# define NEVER_USED(op) ((op.op_type == IS_VAR || op.op_type == IS_TMP_VAR) && !usage[VAR_NUM(op.u.var)]) /* !used_ext[op.u.var] && */
# define RES_NEVER_USED(opline) (ZEND_RESULT_TYPE(opline) == IS_UNUSED || NEVER_USED(opline->result))
#endif
/* Find a set of variables which are used outside of the block where they are
* defined. We won't apply some optimization patterns for sush variables. */
static void zend_t_usage(zend_code_block *block, zend_op_array *op_array, char *used_ext)
{
zend_code_block *next_block = block->next;
char *usage;
char *defined_here;
if (op_array->T == 0) {
/* shortcut - if no Ts, nothing to do */
return;
}
usage = ecalloc(op_array->T, 1);
defined_here = emalloc(op_array->T);
while (next_block) {
zend_op *opline = next_block->start_opline;
zend_op *end = opline + next_block->len;
if (!next_block->access) {
next_block = next_block->next;
continue;
}
memset(defined_here, 0, op_array->T);
while (opline<end) {
T_USAGE(opline->op1);
T_USAGE(opline->op2);
if (RESULT_USED(opline)) {
if (!defined_here[VAR_NUM(ZEND_RESULT(opline).var)] && !used_ext[VAR_NUM(ZEND_RESULT(opline).var)] &&
(opline->opcode == ZEND_RECV || opline->opcode == ZEND_RECV_INIT ||
(opline->opcode == ZEND_OP_DATA && ZEND_RESULT_TYPE(opline) == IS_TMP_VAR) ||
opline->opcode == ZEND_ADD_ARRAY_ELEMENT)) {
/* these opcodes use the result as argument */
used_ext[VAR_NUM(ZEND_RESULT(opline).var)] = 1;
}
defined_here[VAR_NUM(ZEND_RESULT(opline).var)] = 1;
}
opline++;
}
next_block = next_block->next;
}
#if DEBUG_BLOCKPASS
{
int i;
for (i = 0; i< op_array->T; i++) {
fprintf(stderr, "T%d: %c\n", i, used_ext[i] + '0');
}
}
#endif
while (block) {
zend_op *opline = block->start_opline + block->len - 1;
if (!block->access) {
block = block->next;
continue;
}
memcpy(usage, used_ext, op_array->T);
while (opline >= block->start_opline) {
/* usage checks */
if (RES_NEVER_USED(opline)) {
switch (opline->opcode) {
case ZEND_ASSIGN_ADD:
case ZEND_ASSIGN_SUB:
case ZEND_ASSIGN_MUL:
case ZEND_ASSIGN_DIV:
case ZEND_ASSIGN_MOD:
case ZEND_ASSIGN_SL:
case ZEND_ASSIGN_SR:
case ZEND_ASSIGN_CONCAT:
case ZEND_ASSIGN_BW_OR:
case ZEND_ASSIGN_BW_AND:
case ZEND_ASSIGN_BW_XOR:
case ZEND_PRE_INC:
case ZEND_PRE_DEC:
case ZEND_POST_INC:
case ZEND_POST_DEC:
case ZEND_ASSIGN:
case ZEND_ASSIGN_REF:
case ZEND_DO_FCALL:
case ZEND_DO_FCALL_BY_NAME:
if (ZEND_RESULT_TYPE(opline) == IS_VAR) {
#if ZEND_EXTENSION_API_NO > PHP_5_3_X_API_NO
ZEND_RESULT_TYPE(opline) |= EXT_TYPE_UNUSED;
#else
ZEND_RESULT(opline).EA.type |= EXT_TYPE_UNUSED;
#endif
}
break;
case ZEND_QM_ASSIGN:
case ZEND_BOOL:
case ZEND_BOOL_NOT:
if (ZEND_OP1_TYPE(opline) == IS_CONST) {
literal_dtor(&ZEND_OP1_LITERAL(opline));
}
MAKE_NOP(opline);
break;
case ZEND_PRINT:
opline->opcode = ZEND_ECHO;
ZEND_RESULT_TYPE(opline) = IS_UNUSED;
break;
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
opline->opcode -= 3;
SET_UNUSED(opline->result);
break;
}
}
if (opline->opcode == ZEND_RECV ||
opline->opcode == ZEND_RECV_INIT ||
opline->opcode == ZEND_ADD_ARRAY_ELEMENT) {
if (ZEND_OP1_TYPE(opline) == IS_VAR || ZEND_OP1_TYPE(opline) == IS_TMP_VAR) {
usage[VAR_NUM(ZEND_RESULT(opline).var)] = 1;
}
} else {
if (RESULT_USED(opline)) {
usage[VAR_NUM(ZEND_RESULT(opline).var)] = 0;
}
}
if (ZEND_OP1_TYPE(opline) == IS_VAR || ZEND_OP1_TYPE(opline) == IS_TMP_VAR) {
usage[VAR_NUM(ZEND_OP1(opline).var)] = 1;
}
if (ZEND_OP2_TYPE(opline) == IS_VAR || ZEND_OP2_TYPE(opline) == IS_TMP_VAR) {
usage[VAR_NUM(ZEND_OP2(opline).var)] = 1;
}
#if ZEND_EXTENSION_API_NO > PHP_5_3_X_API_NO
if ((ZEND_RESULT_TYPE(opline) & IS_VAR) &&
(ZEND_RESULT_TYPE(opline) & EXT_TYPE_UNUSED) &&
usage[VAR_NUM(ZEND_RESULT(opline).var)]) {
ZEND_RESULT_TYPE(opline) &= ~EXT_TYPE_UNUSED;
}
#else
if (ZEND_RESULT_TYPE(opline) == IS_VAR &&
usage[VAR_NUM(ZEND_RESULT(opline).var)] &&
(ZEND_RESULT(opline).EA.type & EXT_TYPE_UNUSED) != 0) {
ZEND_RESULT(opline).EA.type &= ~EXT_TYPE_UNUSED;
}
#endif
opline--;
}
block = block->next;
} /* end blocks */
efree(defined_here);
efree(usage);
}
#define PASSES 3
static void zend_block_optimization(zend_op_array *op_array TSRMLS_DC)
{
zend_cfg cfg;
zend_code_block *cur_block;
int pass;
char *usage;
#if DEBUG_BLOCKPASS
fprintf(stderr, "File %s func %s\n", op_array->filename, op_array->function_name? op_array->function_name : "main");
fflush(stderr);
#endif
#if ZEND_EXTENSION_API_NO > PHP_5_4_X_API_NO
if (op_array->has_finally_block) {
return;
}
#endif
/* Build CFG */
if (!find_code_blocks(op_array, &cfg)) {
return;
}
zend_rebuild_access_path(&cfg, op_array, 0);
/* full rebuild here to produce correct sources! */
usage = emalloc(op_array->T);
for (pass = 0; pass < PASSES; pass++) {
/* Compute data dependencies */
memset(usage, 0, op_array->T);
zend_t_usage(cfg.blocks, op_array, usage);
/* optimize each basic block separately */
for (cur_block = cfg.blocks; cur_block; cur_block = cur_block->next) {
if (!cur_block->access) {
continue;
}
zend_optimize_block(cur_block, op_array, usage TSRMLS_CC);
}
/* Jump optimization for each block */
for (cur_block = cfg.blocks; cur_block; cur_block = cur_block->next) {
if (!cur_block->access) {
continue;
}
zend_jmp_optimization(cur_block, op_array, cfg.blocks TSRMLS_CC);
}
/* Eliminate unreachable basic blocks */
zend_rebuild_access_path(&cfg, op_array, 1);
}
memset(usage, 0, op_array->T);
zend_t_usage(cfg.blocks, op_array, usage);
assemble_code_blocks(&cfg, op_array);
efree(usage);
/* Destroy CFG */
for (cur_block = cfg.blocks; cur_block; cur_block = cur_block->next) {
zend_block_source *cs = cur_block->sources;
while (cs) {
zend_block_source *n = cs->next;
efree(cs);
cs = n;
}
}
efree(cfg.blocks);
}