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block_pass.c
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/*
+----------------------------------------------------------------------+
| Zend OPcache |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2015 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| [email protected] so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andi Gutmans <[email protected]> |
| Zeev Suraski <[email protected]> |
| Stanislav Malyshev <[email protected]> |
| Dmitry Stogov <[email protected]> |
+----------------------------------------------------------------------+
*/
#include "php.h"
#include "Optimizer/zend_optimizer.h"
#include "Optimizer/zend_optimizer_internal.h"
#include "zend_API.h"
#include "zend_constants.h"
#include "zend_execute.h"
#include "zend_vm.h"
#define DEBUG_BLOCKPASS 0
/* Checks if a constant (like "true") may be replaced by its value */
int zend_optimizer_get_persistent_constant(zend_string *name, zval *result, int copy)
{
zend_constant *c;
char *lookup_name;
int retval = 1;
ALLOCA_FLAG(use_heap);
if ((c = zend_hash_find_ptr(EG(zend_constants), name)) == NULL) {
lookup_name = DO_ALLOCA(ZSTR_LEN(name) + 1);
memcpy(lookup_name, ZSTR_VAL(name), ZSTR_LEN(name) + 1);
zend_str_tolower(lookup_name, ZSTR_LEN(name));
if ((c = zend_hash_str_find_ptr(EG(zend_constants), lookup_name, ZSTR_LEN(name))) != NULL) {
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) {
ZVAL_COPY_VALUE(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_optimizer_ctx *ctx)
{
zend_op *opline;
zend_op *end = op_array->opcodes + op_array->last;
zend_code_block *blocks, *cur_block;
uint32_t opno = 0;
memset(cfg, 0, sizeof(zend_cfg));
blocks = cfg->blocks = zend_arena_calloc(&ctx->arena, 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_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;
case ZEND_JMP:
case ZEND_DECLARE_ANON_CLASS:
case ZEND_DECLARE_ANON_INHERITED_CLASS:
START_BLOCK_OP(ZEND_OP1(opline).opline_num);
/* break missing intentionally */
case ZEND_RETURN:
case ZEND_RETURN_BY_REF:
case ZEND_GENERATOR_RETURN:
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_R:
case ZEND_FE_RESET_RW:
case ZEND_NEW:
case ZEND_JMP_SET:
case ZEND_COALESCE:
case ZEND_ASSERT_CHECK:
START_BLOCK_OP(ZEND_OP2(opline).opline_num);
START_BLOCK_OP(opno + 1);
break;
case ZEND_FE_FETCH_R:
case ZEND_FE_FETCH_RW:
START_BLOCK_OP(opline->extended_value);
START_BLOCK_OP(opno + 1);
break;
}
opno++;
opline++;
}
/* first find block start points */
if (op_array->last_try_catch) {
int i;
cfg->try = zend_arena_calloc(&ctx->arena, op_array->last_try_catch, sizeof(zend_code_block *));
cfg->catch = zend_arena_calloc(&ctx->arena, 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;
}
}
/* 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:
case ZEND_RETURN_BY_REF:
case ZEND_GENERATOR_RETURN:
case ZEND_EXIT:
case ZEND_THROW:
break;
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;
case ZEND_JMP:
cur_block->op1_to = &blocks[ZEND_OP1(opline).opline_num];
break;
case ZEND_DECLARE_ANON_CLASS:
case ZEND_DECLARE_ANON_INHERITED_CLASS:
cur_block->op1_to = &blocks[ZEND_OP1(opline).opline_num];
cur_block->follow_to = &blocks[opno];
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_FE_FETCH_R:
case ZEND_FE_FETCH_RW:
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_R:
case ZEND_FE_RESET_RW:
case ZEND_NEW:
case ZEND_JMP_SET:
case ZEND_COALESCE:
case ZEND_ASSERT_CHECK:
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 = zend_arena_alloc(&ctx->arena, sizeof(zend_block_source)); \
__t->next = tob->sources; \
tob->sources = __t; \
__t->from = fromb; \
} \
}
#define DEL_SOURCE(cs) do { \
*(cs) = (*(cs))->next; \
} while (0)
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->protected && 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;
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, zend_optimizer_ctx *ctx)
{
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, zend_optimizer_ctx *ctx)
{
if (block->access) {
return;
}
block->access = 1;
if (block->op1_to) {
zend_access_path(block->op1_to, ctx);
ADD_SOURCE(block, block->op1_to);
}
if (block->op2_to) {
zend_access_path(block->op2_to, ctx);
ADD_SOURCE(block, block->op2_to);
}
if (block->ext_to) {
zend_access_path(block->ext_to, ctx);
ADD_SOURCE(block, block->ext_to);
}
if (block->follow_to) {
zend_access_path(block->follow_to, ctx);
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_optimizer_ctx *ctx)
{
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) {
if (!start && b->access) {
start = b;
}
b->access = 0;
b->sources = NULL;
b = b->next;
}
/* Walk thorough all paths */
zend_access_path(start, ctx);
/* 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], ctx);
}
}
}
}
/* Data dependencies macros */
#define VAR_NUM_EX(op) VAR_NUM((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)
#define convert_to_string_safe(v) \
if (Z_TYPE_P((v)) == IS_NULL) { \
ZVAL_STRINGL((v), "", 0); \
} else { \
convert_to_string((v)); \
}
static void strip_nop(zend_code_block *block, zend_optimizer_ctx *ctx)
{
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, ctx);
}
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, zend_cfg *cfg, zend_optimizer_ctx *ctx)
{
zend_op *opline = block->start_opline;
zend_op *end, *last_op = NULL;
zend_op **Tsource = cfg->Tsource;
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, ctx);
}
return;
}
block->start_opline++;
block->start_opline_no++;
block->len--;
}
/* we track data dependencies only insight a single basic block */
memset(Tsource, 0, (op_array->last_var + 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|IS_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_LIST &&
(opline->opcode != ZEND_FE_RESET_R || opline->opcode != ZEND_FE_RESET_RW) &&
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);
zend_optimizer_update_op1_const(op_array, opline, &c);
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|IS_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);
zend_optimizer_update_op2_const(op_array, opline, &c);
literal_dtor(&ZEND_OP1_LITERAL(src));
MAKE_NOP(src);
}
/* T = CAST(X, String), ECHO(T) => NOP, ECHO(X) */
if (opline->opcode == ZEND_ECHO &&
ZEND_OP1_TYPE(opline) & (IS_TMP_VAR|IS_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 = 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_optimizer_get_persistent_constant(Z_STR_P(arg), &c, 0 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((function = zend_hash_find_ptr(EG(function_table), Z_STR_P(arg))) != NULL) {
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_optimizer_get_persistent_constant(Z_STR_P(arg), &c, 1 ELS_CC) != 0) {
literal_dtor(arg);
MAKE_NOP(sv);
MAKE_NOP(fcall);
ZEND_OP1_LITERAL(opline) = zend_optimizer_add_literal(op_array, &c);
/* 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_STR_P(arg))) {
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)
* CASE(TRUE, X) => BOOL(X)
* CASE(FALSE, X) => BOOL_NOT(X)
*/
if (opline->opcode == ZEND_IS_EQUAL ||
opline->opcode == ZEND_IS_NOT_EQUAL ||
/* CASE variable will be deleted later by FREE, so we can't optimize it */
(opline->opcode == ZEND_CASE && (ZEND_OP1_TYPE(opline) & (IS_CONST|IS_CV)))) {
if (ZEND_OP1_TYPE(opline) == IS_CONST &&
(Z_TYPE(ZEND_OP1_LITERAL(opline)) == IS_FALSE ||
Z_TYPE(ZEND_OP1_LITERAL(opline)) == IS_TRUE)) {
/* T = IS_EQUAL(TRUE, X) => T = BOOL(X) */
/* T = IS_EQUAL(FALSE, X) => T = BOOL_NOT(X) */
/* T = IS_NOT_EQUAL(TRUE, X) => T = BOOL_NOT(X) */
/* T = IS_NOT_EQUAL(FALSE, X) => T = BOOL(X) */
/* Optimization of comparison with "null" is not safe,
* because ("0" == null) is not equal to !("0")
*/
opline->opcode =
((opline->opcode != ZEND_IS_NOT_EQUAL) == ((Z_TYPE(ZEND_OP1_LITERAL(opline))) == IS_TRUE)) ?
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_FALSE ||
Z_TYPE(ZEND_OP2_LITERAL(opline)) == IS_TRUE)) {
/* T = IS_EQUAL(X, TRUE) => T = BOOL(X) */
/* T = IS_EQUAL(X, FALSE) => T = BOOL_NOT(X) */
/* T = IS_NOT_EQUAL(X, TRUE) => T = BOOL_NOT(X) */
/* T = IS_NOT_EQUAL(X, FALSE) => T = BOOL(X) */
/* Optimization of comparison with "null" is not safe,
* because ("0" == null) is not equal to !("0")
*/
opline->opcode =
((opline->opcode != ZEND_IS_NOT_EQUAL) == ((Z_TYPE(ZEND_OP2_LITERAL(opline))) == IS_TRUE)) ?
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|IS_VAR)) &&
VAR_SOURCE(opline->op1) != NULL &&
(!used_ext[VAR_NUM(ZEND_OP1(opline).var)] ||
((ZEND_RESULT_TYPE(opline) & (IS_TMP_VAR|IS_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, old_len;
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));
}
old_len = Z_STRLEN(ZEND_OP1_LITERAL(last_op));
l = old_len + Z_STRLEN(ZEND_OP1_LITERAL(opline));
if (!Z_REFCOUNTED(ZEND_OP1_LITERAL(last_op))) {
zend_string *tmp = zend_string_alloc(l, 0);
memcpy(ZSTR_VAL(tmp), Z_STRVAL(ZEND_OP1_LITERAL(last_op)), old_len);
Z_STR(ZEND_OP1_LITERAL(last_op)) = tmp;
} else {
Z_STR(ZEND_OP1_LITERAL(last_op)) = zend_string_extend(Z_STR(ZEND_OP1_LITERAL(last_op)), l, 0);
}
Z_TYPE_INFO(ZEND_OP1_LITERAL(last_op)) = IS_STRING_EX;
memcpy(Z_STRVAL(ZEND_OP1_LITERAL(last_op)) + old_len, 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));
Z_STR(ZEND_OP1_LITERAL(opline)) = zend_new_interned_string(Z_STR(ZEND_OP1_LITERAL(last_op)));
if (!Z_REFCOUNTED(ZEND_OP1_LITERAL(opline))) {
Z_TYPE_FLAGS(ZEND_OP1_LITERAL(opline)) &= ~ (IS_TYPE_REFCOUNTED | IS_TYPE_COPYABLE);
}
ZVAL_NULL(&ZEND_OP1_LITERAL(last_op));
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_FAST_CONCAT) &&
ZEND_OP2_TYPE(VAR_SOURCE(opline->op1)) == IS_CONST &&
ZEND_RESULT(VAR_SOURCE(opline->op1)).var == ZEND_OP1(opline).var) {
/* compress consecutive CONCAT/ADD_STRING/ADD_CHARs */
zend_op *src = VAR_SOURCE(opline->op1);
int l, old_len;
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);
COPY_NODE(opline->op1, src->op1);
old_len = Z_STRLEN(ZEND_OP2_LITERAL(src));
l = old_len + Z_STRLEN(ZEND_OP2_LITERAL(opline));
if (!Z_REFCOUNTED(ZEND_OP2_LITERAL(src))) {
zend_string *tmp = zend_string_alloc(l, 0);
memcpy(ZSTR_VAL(tmp), Z_STRVAL(ZEND_OP2_LITERAL(src)), old_len);
Z_STR(ZEND_OP2_LITERAL(last_op)) = tmp;
} else {
Z_STR(ZEND_OP2_LITERAL(src)) = zend_string_extend(Z_STR(ZEND_OP2_LITERAL(src)), l, 0);
}
Z_TYPE_INFO(ZEND_OP2_LITERAL(last_op)) = IS_STRING_EX;
memcpy(Z_STRVAL(ZEND_OP2_LITERAL(src)) + old_len, Z_STRVAL(ZEND_OP2_LITERAL(opline)), Z_STRLEN(ZEND_OP2_LITERAL(opline)));
Z_STRVAL(ZEND_OP2_LITERAL(src))[l] = '\0';
zend_string_release(Z_STR(ZEND_OP2_LITERAL(opline)));
Z_STR(ZEND_OP2_LITERAL(opline)) = zend_new_interned_string(Z_STR(ZEND_OP2_LITERAL(src)));
if (!Z_REFCOUNTED(ZEND_OP2_LITERAL(opline))) {
Z_TYPE_FLAGS(ZEND_OP2_LITERAL(opline)) &= ~ (IS_TYPE_REFCOUNTED | IS_TYPE_COPYABLE);
}
ZVAL_NULL(&ZEND_OP2_LITERAL(src));
MAKE_NOP(src);
} 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_FAST_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 */
binary_op_type binary_op = get_binary_op(opline->opcode);
zval result;
int er;
if ((opline->opcode == ZEND_DIV || opline->opcode == ZEND_MOD) &&
zval_get_long(&ZEND_OP2_LITERAL(opline)) == 0) {
if (RESULT_USED(opline)) {
SET_VAR_SOURCE(opline);
}
opline++;
continue;
} else if ((opline->opcode == ZEND_SL || opline->opcode == ZEND_SR) &&
zval_get_long(&ZEND_OP2_LITERAL(opline)) < 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)) == SUCCESS) {
literal_dtor(&ZEND_OP1_LITERAL(opline));
literal_dtor(&ZEND_OP2_LITERAL(opline));
opline->opcode = ZEND_QM_ASSIGN;
SET_UNUSED(opline->op2);
zend_optimizer_update_op1_const(op_array, opline, &result);
}
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) {
unary_op(&result, &ZEND_OP1_LITERAL(opline));
literal_dtor(&ZEND_OP1_LITERAL(opline));
} else {
/* BOOL */
result = ZEND_OP1_LITERAL(opline);
convert_to_boolean(&result);
ZVAL_NULL(&ZEND_OP1_LITERAL(opline));
}
opline->opcode = ZEND_QM_ASSIGN;
zend_optimizer_update_op1_const(op_array, opline, &result);
} else if ((opline->opcode == ZEND_RETURN || opline->opcode == ZEND_EXIT) &&
(ZEND_OP1_TYPE(opline) & (IS_TMP_VAR|IS_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_CONCAT || opline->opcode == ZEND_FAST_CONCAT) {
if ((ZEND_OP1_TYPE(opline) & (IS_TMP_VAR|IS_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);
MAKE_NOP(src);
}
if ((ZEND_OP2_TYPE(opline) & (IS_TMP_VAR|IS_VAR)) &&
VAR_SOURCE(opline->op2) &&
VAR_SOURCE(opline->op2)->opcode == ZEND_CAST &&
VAR_SOURCE(opline->op2)->extended_value == IS_STRING) {
/* convert T1 = CAST(STRING, X), T2 = CONCAT(Y, T1) to T2 = CONCAT(Y,X) */
zend_op *src = VAR_SOURCE(opline->op2);
VAR_UNSET(opline->op2);
COPY_NODE(opline->op2, src->op1);
MAKE_NOP(src);
}
if (ZEND_OP1_TYPE(opline) == IS_CONST &&
Z_TYPE(ZEND_OP1_LITERAL(opline)) == IS_STRING &&
Z_STRLEN(ZEND_OP1_LITERAL(opline)) == 0) {
/* convert CONCAT('', X) => CAST(STRING, X) */
literal_dtor(&ZEND_OP1_LITERAL(opline));
opline->opcode = ZEND_CAST;