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dis-bench / src /php /php-src /Zend /Optimizer /zend_optimizer.c
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/*
+----------------------------------------------------------------------+
| Zend OPcache |
+----------------------------------------------------------------------+
| Copyright (c) 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: |
| https://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 |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andi Gutmans <andi@php.net> |
| Zeev Suraski <zeev@php.net> |
| Stanislav Malyshev <stas@zend.com> |
| Dmitry Stogov <dmitry@php.net> |
+----------------------------------------------------------------------+
*/
#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"
#include "zend_cfg.h"
#include "zend_func_info.h"
#include "zend_call_graph.h"
#include "zend_inference.h"
#include "zend_dump.h"
#include "php.h"
#ifndef ZEND_OPTIMIZER_MAX_REGISTERED_PASSES
# define ZEND_OPTIMIZER_MAX_REGISTERED_PASSES 32
#endif
struct {
zend_optimizer_pass_t pass[ZEND_OPTIMIZER_MAX_REGISTERED_PASSES];
int last;
} zend_optimizer_registered_passes = {{NULL}, 0};
void zend_optimizer_collect_constant(zend_optimizer_ctx *ctx, zval *name, zval* value)
{
if (!ctx->constants) {
ctx->constants = zend_arena_alloc(&ctx->arena, sizeof(HashTable));
zend_hash_init(ctx->constants, 16, NULL, zval_ptr_dtor_nogc, 0);
}
if (zend_hash_add(ctx->constants, Z_STR_P(name), value)) {
Z_TRY_ADDREF_P(value);
}
}
zend_result zend_optimizer_eval_binary_op(zval *result, uint8_t opcode, zval *op1, zval *op2) /* {{{ */
{
if (zend_binary_op_produces_error(opcode, op1, op2)) {
return FAILURE;
}
binary_op_type binary_op = get_binary_op(opcode);
return binary_op(result, op1, op2);
}
/* }}} */
zend_result zend_optimizer_eval_unary_op(zval *result, uint8_t opcode, zval *op1) /* {{{ */
{
unary_op_type unary_op = get_unary_op(opcode);
if (unary_op) {
if (zend_unary_op_produces_error(opcode, op1)) {
return FAILURE;
}
return unary_op(result, op1);
} else { /* ZEND_BOOL */
ZVAL_BOOL(result, zend_is_true(op1));
return SUCCESS;
}
}
/* }}} */
zend_result zend_optimizer_eval_cast(zval *result, uint32_t type, zval *op1) /* {{{ */
{
if (zend_try_ct_eval_cast(result, type, op1)) {
return SUCCESS;
}
return FAILURE;
}
/* }}} */
zend_result zend_optimizer_eval_strlen(zval *result, const zval *op1) /* {{{ */
{
if (Z_TYPE_P(op1) != IS_STRING) {
return FAILURE;
}
ZVAL_LONG(result, Z_STRLEN_P(op1));
return SUCCESS;
}
/* }}} */
zend_result zend_optimizer_eval_special_func_call(
zval *result, zend_string *name, zend_string *arg) {
if (zend_string_equals_literal(name, "function_exists") ||
zend_string_equals_literal(name, "is_callable")) {
zend_string *lc_name = zend_string_tolower(arg);
zend_internal_function *func = zend_hash_find_ptr(EG(function_table), lc_name);
zend_string_release_ex(lc_name, 0);
if (func && func->type == ZEND_INTERNAL_FUNCTION
&& func->module->type == MODULE_PERSISTENT
#ifdef ZEND_WIN32
&& func->module->handle == NULL
#endif
) {
ZVAL_TRUE(result);
return SUCCESS;
}
return FAILURE;
}
if (zend_string_equals_literal(name, "extension_loaded")) {
zend_string *lc_name = zend_string_tolower(arg);
zend_module_entry *m = zend_hash_find_ptr(&module_registry, lc_name);
zend_string_release_ex(lc_name, 0);
if (!m) {
if (PG(enable_dl)) {
return FAILURE;
}
ZVAL_FALSE(result);
return SUCCESS;
}
if (m->type == MODULE_PERSISTENT
#ifdef ZEND_WIN32
&& m->handle == NULL
#endif
) {
ZVAL_TRUE(result);
return SUCCESS;
}
return FAILURE;
}
if (zend_string_equals_literal(name, "constant")) {
return zend_optimizer_get_persistent_constant(arg, result, 1) ? SUCCESS : FAILURE;
}
if (zend_string_equals_literal(name, "dirname")) {
if (!IS_ABSOLUTE_PATH(ZSTR_VAL(arg), ZSTR_LEN(arg))) {
return FAILURE;
}
zend_string *dirname = zend_string_init(ZSTR_VAL(arg), ZSTR_LEN(arg), 0);
ZSTR_LEN(dirname) = zend_dirname(ZSTR_VAL(dirname), ZSTR_LEN(dirname));
if (IS_ABSOLUTE_PATH(ZSTR_VAL(dirname), ZSTR_LEN(dirname))) {
ZVAL_STR(result, dirname);
return SUCCESS;
}
zend_string_release_ex(dirname, 0);
return FAILURE;
}
if (zend_string_equals_literal(name, "ini_get")) {
zend_ini_entry *ini_entry = zend_hash_find_ptr(EG(ini_directives), arg);
if (!ini_entry) {
if (PG(enable_dl)) {
return FAILURE;
}
ZVAL_FALSE(result);
} else if (ini_entry->modifiable != ZEND_INI_SYSTEM) {
return FAILURE;
} else if (ini_entry->value) {
ZVAL_STR_COPY(result, ini_entry->value);
} else {
ZVAL_EMPTY_STRING(result);
}
return SUCCESS;
}
return FAILURE;
}
bool zend_optimizer_get_collected_constant(HashTable *constants, zval *name, zval* value)
{
zval *val;
if ((val = zend_hash_find(constants, Z_STR_P(name))) != NULL) {
ZVAL_COPY(value, val);
return 1;
}
return 0;
}
void zend_optimizer_convert_to_free_op1(zend_op_array *op_array, zend_op *opline)
{
if (opline->op1_type == IS_CV) {
opline->opcode = ZEND_CHECK_VAR;
SET_UNUSED(opline->op2);
SET_UNUSED(opline->result);
opline->extended_value = 0;
} else if (opline->op1_type & (IS_TMP_VAR|IS_VAR)) {
opline->opcode = ZEND_FREE;
SET_UNUSED(opline->op2);
SET_UNUSED(opline->result);
opline->extended_value = 0;
} else {
ZEND_ASSERT(opline->op1_type == IS_CONST);
literal_dtor(&ZEND_OP1_LITERAL(opline));
MAKE_NOP(opline);
}
}
int zend_optimizer_add_literal(zend_op_array *op_array, const zval *zv)
{
int i = op_array->last_literal;
op_array->last_literal++;
op_array->literals = (zval*)erealloc(op_array->literals, op_array->last_literal * sizeof(zval));
ZVAL_COPY_VALUE(&op_array->literals[i], zv);
Z_EXTRA(op_array->literals[i]) = 0;
return i;
}
static inline int zend_optimizer_add_literal_string(zend_op_array *op_array, zend_string *str) {
zval zv;
ZVAL_STR(&zv, str);
zend_string_hash_val(str);
return zend_optimizer_add_literal(op_array, &zv);
}
static inline void drop_leading_backslash(zval *val) {
if (Z_STRVAL_P(val)[0] == '\\') {
zend_string *str = zend_string_init(Z_STRVAL_P(val) + 1, Z_STRLEN_P(val) - 1, 0);
zval_ptr_dtor_nogc(val);
ZVAL_STR(val, str);
}
}
static inline uint32_t alloc_cache_slots(zend_op_array *op_array, uint32_t num) {
uint32_t ret = op_array->cache_size;
op_array->cache_size += num * sizeof(void *);
return ret;
}
#define REQUIRES_STRING(val) do { \
if (Z_TYPE_P(val) != IS_STRING) { \
return 0; \
} \
} while (0)
#define TO_STRING_NOWARN(val) do { \
if (Z_TYPE_P(val) >= IS_ARRAY) { \
return 0; \
} \
convert_to_string(val); \
} while (0)
bool zend_optimizer_update_op1_const(zend_op_array *op_array,
zend_op *opline,
zval *val)
{
switch (opline->opcode) {
case ZEND_OP_DATA:
switch ((opline-1)->opcode) {
case ZEND_ASSIGN_OBJ_REF:
case ZEND_ASSIGN_STATIC_PROP_REF:
return 0;
}
opline->op1.constant = zend_optimizer_add_literal(op_array, val);
break;
case ZEND_FREE:
case ZEND_CHECK_VAR:
MAKE_NOP(opline);
zval_ptr_dtor_nogc(val);
return 1;
case ZEND_SEND_VAR_EX:
case ZEND_SEND_FUNC_ARG:
case ZEND_FETCH_DIM_W:
case ZEND_FETCH_DIM_RW:
case ZEND_FETCH_DIM_FUNC_ARG:
case ZEND_FETCH_DIM_UNSET:
case ZEND_FETCH_LIST_W:
case ZEND_ASSIGN_DIM:
case ZEND_RETURN_BY_REF:
case ZEND_INSTANCEOF:
case ZEND_MAKE_REF:
case ZEND_SEPARATE:
case ZEND_SEND_VAR_NO_REF:
case ZEND_SEND_VAR_NO_REF_EX:
return 0;
case ZEND_CATCH:
REQUIRES_STRING(val);
drop_leading_backslash(val);
opline->op1.constant = zend_optimizer_add_literal(op_array, val);
opline->extended_value = alloc_cache_slots(op_array, 1) | (opline->extended_value & ZEND_LAST_CATCH);
zend_optimizer_add_literal_string(op_array, zend_string_tolower(Z_STR_P(val)));
break;
case ZEND_DEFINED:
REQUIRES_STRING(val);
drop_leading_backslash(val);
opline->op1.constant = zend_optimizer_add_literal(op_array, val);
opline->extended_value = alloc_cache_slots(op_array, 1);
zend_optimizer_add_literal_string(op_array, zend_string_tolower(Z_STR_P(val)));
break;
case ZEND_NEW:
REQUIRES_STRING(val);
drop_leading_backslash(val);
opline->op1.constant = zend_optimizer_add_literal(op_array, val);
opline->op2.num = alloc_cache_slots(op_array, 1);
zend_optimizer_add_literal_string(op_array, zend_string_tolower(Z_STR_P(val)));
break;
case ZEND_INIT_STATIC_METHOD_CALL:
REQUIRES_STRING(val);
drop_leading_backslash(val);
opline->op1.constant = zend_optimizer_add_literal(op_array, val);
if (opline->op2_type != IS_CONST) {
opline->result.num = alloc_cache_slots(op_array, 1);
}
zend_optimizer_add_literal_string(op_array, zend_string_tolower(Z_STR_P(val)));
break;
case ZEND_FETCH_CLASS_CONSTANT:
REQUIRES_STRING(val);
drop_leading_backslash(val);
opline->op1.constant = zend_optimizer_add_literal(op_array, val);
if (opline->op2_type != IS_CONST) {
opline->extended_value = alloc_cache_slots(op_array, 1);
}
zend_optimizer_add_literal_string(op_array, zend_string_tolower(Z_STR_P(val)));
break;
case ZEND_ASSIGN_OP:
case ZEND_ASSIGN_DIM_OP:
case ZEND_ASSIGN_OBJ_OP:
break;
case ZEND_ASSIGN_STATIC_PROP_OP:
case ZEND_ASSIGN_STATIC_PROP:
case ZEND_ASSIGN_STATIC_PROP_REF:
case ZEND_FETCH_STATIC_PROP_R:
case ZEND_FETCH_STATIC_PROP_W:
case ZEND_FETCH_STATIC_PROP_RW:
case ZEND_FETCH_STATIC_PROP_IS:
case ZEND_FETCH_STATIC_PROP_UNSET:
case ZEND_FETCH_STATIC_PROP_FUNC_ARG:
case ZEND_UNSET_STATIC_PROP:
case ZEND_ISSET_ISEMPTY_STATIC_PROP:
case ZEND_PRE_INC_STATIC_PROP:
case ZEND_PRE_DEC_STATIC_PROP:
case ZEND_POST_INC_STATIC_PROP:
case ZEND_POST_DEC_STATIC_PROP:
TO_STRING_NOWARN(val);
opline->op1.constant = zend_optimizer_add_literal(op_array, val);
if (opline->op2_type == IS_CONST && (opline->extended_value & ~ZEND_FETCH_OBJ_FLAGS) + sizeof(void*) == op_array->cache_size) {
op_array->cache_size += sizeof(void *);
} else {
opline->extended_value = alloc_cache_slots(op_array, 3) | (opline->extended_value & ZEND_FETCH_OBJ_FLAGS);
}
break;
case ZEND_SEND_VAR:
opline->opcode = ZEND_SEND_VAL;
opline->op1.constant = zend_optimizer_add_literal(op_array, val);
break;
case ZEND_CASE:
opline->opcode = ZEND_IS_EQUAL;
opline->op1.constant = zend_optimizer_add_literal(op_array, val);
break;
case ZEND_CASE_STRICT:
opline->opcode = ZEND_IS_IDENTICAL;
opline->op1.constant = zend_optimizer_add_literal(op_array, val);
break;
case ZEND_VERIFY_RETURN_TYPE:
/* This would require a non-local change.
* zend_optimizer_replace_by_const() supports this. */
return 0;
case ZEND_COPY_TMP:
case ZEND_FETCH_CLASS_NAME:
return 0;
case ZEND_ECHO:
{
zval zv;
if (Z_TYPE_P(val) != IS_STRING && zend_optimizer_eval_cast(&zv, IS_STRING, val) == SUCCESS) {
zval_ptr_dtor_nogc(val);
val = &zv;
}
opline->op1.constant = zend_optimizer_add_literal(op_array, val);
if (Z_TYPE_P(val) == IS_STRING && Z_STRLEN_P(val) == 0) {
MAKE_NOP(opline);
return 1;
}
/* TODO: In a subsequent pass, *after* this step and compacting nops, combine consecutive ZEND_ECHOs using the block information from ssa->cfg */
/* (e.g. for ext/opcache/tests/opt/sccp_010.phpt) */
break;
}
case ZEND_CONCAT:
case ZEND_FAST_CONCAT:
case ZEND_FETCH_R:
case ZEND_FETCH_W:
case ZEND_FETCH_RW:
case ZEND_FETCH_IS:
case ZEND_FETCH_UNSET:
case ZEND_FETCH_FUNC_ARG:
case ZEND_ISSET_ISEMPTY_VAR:
case ZEND_UNSET_VAR:
TO_STRING_NOWARN(val);
if (opline->opcode == ZEND_CONCAT && opline->op2_type == IS_CONST) {
opline->opcode = ZEND_FAST_CONCAT;
}
ZEND_FALLTHROUGH;
default:
opline->op1.constant = zend_optimizer_add_literal(op_array, val);
break;
}
opline->op1_type = IS_CONST;
if (Z_TYPE(ZEND_OP1_LITERAL(opline)) == IS_STRING) {
zend_string_hash_val(Z_STR(ZEND_OP1_LITERAL(opline)));
}
return 1;
}
bool zend_optimizer_update_op2_const(zend_op_array *op_array,
zend_op *opline,
zval *val)
{
zval tmp;
switch (opline->opcode) {
case ZEND_ASSIGN_REF:
case ZEND_FAST_CALL:
return 0;
case ZEND_FETCH_CLASS:
case ZEND_INSTANCEOF:
REQUIRES_STRING(val);
drop_leading_backslash(val);
opline->op2.constant = zend_optimizer_add_literal(op_array, val);
zend_optimizer_add_literal_string(op_array, zend_string_tolower(Z_STR_P(val)));
opline->extended_value = alloc_cache_slots(op_array, 1);
break;
case ZEND_INIT_FCALL_BY_NAME:
REQUIRES_STRING(val);
drop_leading_backslash(val);
opline->op2.constant = zend_optimizer_add_literal(op_array, val);
zend_optimizer_add_literal_string(op_array, zend_string_tolower(Z_STR_P(val)));
opline->result.num = alloc_cache_slots(op_array, 1);
break;
case ZEND_ASSIGN_STATIC_PROP:
case ZEND_ASSIGN_STATIC_PROP_REF:
case ZEND_FETCH_STATIC_PROP_R:
case ZEND_FETCH_STATIC_PROP_W:
case ZEND_FETCH_STATIC_PROP_RW:
case ZEND_FETCH_STATIC_PROP_IS:
case ZEND_FETCH_STATIC_PROP_UNSET:
case ZEND_FETCH_STATIC_PROP_FUNC_ARG:
case ZEND_UNSET_STATIC_PROP:
case ZEND_ISSET_ISEMPTY_STATIC_PROP:
case ZEND_PRE_INC_STATIC_PROP:
case ZEND_PRE_DEC_STATIC_PROP:
case ZEND_POST_INC_STATIC_PROP:
case ZEND_POST_DEC_STATIC_PROP:
case ZEND_ASSIGN_STATIC_PROP_OP:
REQUIRES_STRING(val);
drop_leading_backslash(val);
opline->op2.constant = zend_optimizer_add_literal(op_array, val);
zend_optimizer_add_literal_string(op_array, zend_string_tolower(Z_STR_P(val)));
if (opline->op1_type != IS_CONST) {
opline->extended_value = alloc_cache_slots(op_array, 1) | (opline->extended_value & (ZEND_RETURNS_FUNCTION|ZEND_ISEMPTY|ZEND_FETCH_OBJ_FLAGS));
}
break;
case ZEND_INIT_FCALL:
REQUIRES_STRING(val);
if (Z_REFCOUNT_P(val) == 1) {
zend_str_tolower(Z_STRVAL_P(val), Z_STRLEN_P(val));
} else {
ZVAL_STR(&tmp, zend_string_tolower(Z_STR_P(val)));
zval_ptr_dtor_nogc(val);
val = &tmp;
}
opline->op2.constant = zend_optimizer_add_literal(op_array, val);
opline->result.num = alloc_cache_slots(op_array, 1);
break;
case ZEND_INIT_DYNAMIC_CALL:
if (Z_TYPE_P(val) == IS_STRING) {
if (zend_memrchr(Z_STRVAL_P(val), ':', Z_STRLEN_P(val))) {
return 0;
}
if (zend_optimizer_classify_function(Z_STR_P(val), opline->extended_value)) {
/* Dynamic call to various special functions must stay dynamic,
* otherwise would drop a warning */
return 0;
}
opline->opcode = ZEND_INIT_FCALL_BY_NAME;
drop_leading_backslash(val);
opline->op2.constant = zend_optimizer_add_literal(op_array, val);
zend_optimizer_add_literal_string(op_array, zend_string_tolower(Z_STR_P(val)));
opline->result.num = alloc_cache_slots(op_array, 1);
} else {
opline->op2.constant = zend_optimizer_add_literal(op_array, val);
}
break;
case ZEND_INIT_METHOD_CALL:
REQUIRES_STRING(val);
opline->op2.constant = zend_optimizer_add_literal(op_array, val);
zend_optimizer_add_literal_string(op_array, zend_string_tolower(Z_STR_P(val)));
opline->result.num = alloc_cache_slots(op_array, 2);
break;
case ZEND_INIT_STATIC_METHOD_CALL:
REQUIRES_STRING(val);
opline->op2.constant = zend_optimizer_add_literal(op_array, val);
zend_optimizer_add_literal_string(op_array, zend_string_tolower(Z_STR_P(val)));
if (opline->op1_type != IS_CONST) {
opline->result.num = alloc_cache_slots(op_array, 2);
}
break;
case ZEND_ASSIGN_OBJ:
case ZEND_ASSIGN_OBJ_REF:
case ZEND_FETCH_OBJ_R:
case ZEND_FETCH_OBJ_W:
case ZEND_FETCH_OBJ_RW:
case ZEND_FETCH_OBJ_IS:
case ZEND_FETCH_OBJ_UNSET:
case ZEND_FETCH_OBJ_FUNC_ARG:
case ZEND_UNSET_OBJ:
case ZEND_PRE_INC_OBJ:
case ZEND_PRE_DEC_OBJ:
case ZEND_POST_INC_OBJ:
case ZEND_POST_DEC_OBJ:
TO_STRING_NOWARN(val);
opline->op2.constant = zend_optimizer_add_literal(op_array, val);
opline->extended_value = alloc_cache_slots(op_array, 3);
break;
case ZEND_ASSIGN_OBJ_OP:
TO_STRING_NOWARN(val);
opline->op2.constant = zend_optimizer_add_literal(op_array, val);
ZEND_ASSERT((opline + 1)->opcode == ZEND_OP_DATA);
(opline + 1)->extended_value = alloc_cache_slots(op_array, 3);
break;
case ZEND_ISSET_ISEMPTY_PROP_OBJ:
TO_STRING_NOWARN(val);
opline->op2.constant = zend_optimizer_add_literal(op_array, val);
opline->extended_value = alloc_cache_slots(op_array, 3) | (opline->extended_value & ZEND_ISEMPTY);
break;
case ZEND_ASSIGN_DIM_OP:
case ZEND_ISSET_ISEMPTY_DIM_OBJ:
case ZEND_ASSIGN_DIM:
case ZEND_UNSET_DIM:
case ZEND_FETCH_DIM_R:
case ZEND_FETCH_DIM_W:
case ZEND_FETCH_DIM_RW:
case ZEND_FETCH_DIM_IS:
case ZEND_FETCH_DIM_FUNC_ARG:
case ZEND_FETCH_DIM_UNSET:
case ZEND_FETCH_LIST_R:
case ZEND_FETCH_LIST_W:
if (Z_TYPE_P(val) == IS_STRING) {
zend_ulong index;
if (ZEND_HANDLE_NUMERIC(Z_STR_P(val), index)) {
ZVAL_LONG(&tmp, index);
opline->op2.constant = zend_optimizer_add_literal(op_array, &tmp);
zend_string_hash_val(Z_STR_P(val));
zend_optimizer_add_literal(op_array, val);
Z_EXTRA(op_array->literals[opline->op2.constant]) = ZEND_EXTRA_VALUE;
break;
}
}
opline->op2.constant = zend_optimizer_add_literal(op_array, val);
break;
case ZEND_ADD_ARRAY_ELEMENT:
case ZEND_INIT_ARRAY:
if (Z_TYPE_P(val) == IS_STRING) {
zend_ulong index;
if (ZEND_HANDLE_NUMERIC(Z_STR_P(val), index)) {
zval_ptr_dtor_nogc(val);
ZVAL_LONG(val, index);
}
}
opline->op2.constant = zend_optimizer_add_literal(op_array, val);
break;
case ZEND_ROPE_INIT:
case ZEND_ROPE_ADD:
case ZEND_ROPE_END:
case ZEND_CONCAT:
case ZEND_FAST_CONCAT:
TO_STRING_NOWARN(val);
if (opline->opcode == ZEND_CONCAT && opline->op1_type == IS_CONST) {
opline->opcode = ZEND_FAST_CONCAT;
}
ZEND_FALLTHROUGH;
default:
opline->op2.constant = zend_optimizer_add_literal(op_array, val);
break;
}
opline->op2_type = IS_CONST;
if (Z_TYPE(ZEND_OP2_LITERAL(opline)) == IS_STRING) {
zend_string_hash_val(Z_STR(ZEND_OP2_LITERAL(opline)));
}
return 1;
}
bool zend_optimizer_replace_by_const(zend_op_array *op_array,
zend_op *opline,
uint8_t type,
uint32_t var,
zval *val)
{
zend_op *end = op_array->opcodes + op_array->last;
while (opline < end) {
if (opline->op1_type == type &&
opline->op1.var == var) {
switch (opline->opcode) {
/* In most cases IS_TMP_VAR operand may be used only once.
* The operands are usually destroyed by the opcode handler.
* However, there are some exception which keep the operand alive. In that case
* we want to try to replace all uses of the temporary.
*/
case ZEND_FETCH_LIST_R:
case ZEND_CASE:
case ZEND_CASE_STRICT:
case ZEND_SWITCH_LONG:
case ZEND_SWITCH_STRING:
case ZEND_MATCH:
case ZEND_MATCH_ERROR:
case ZEND_JMP_NULL: {
zend_op *end = op_array->opcodes + op_array->last;
while (opline < end) {
if (opline->op1_type == type && opline->op1.var == var) {
/* If this opcode doesn't keep the operand alive, we're done. Check
* this early, because op replacement may modify the opline. */
bool is_last = opline->opcode != ZEND_FETCH_LIST_R
&& opline->opcode != ZEND_CASE
&& opline->opcode != ZEND_CASE_STRICT
&& opline->opcode != ZEND_SWITCH_LONG
&& opline->opcode != ZEND_SWITCH_STRING
&& opline->opcode != ZEND_MATCH
&& opline->opcode != ZEND_MATCH_ERROR
&& opline->opcode != ZEND_JMP_NULL
&& (opline->opcode != ZEND_FREE
|| opline->extended_value != ZEND_FREE_ON_RETURN);
Z_TRY_ADDREF_P(val);
if (!zend_optimizer_update_op1_const(op_array, opline, val)) {
zval_ptr_dtor(val);
return 0;
}
if (is_last) {
break;
}
}
opline++;
}
zval_ptr_dtor_nogc(val);
return 1;
}
case ZEND_VERIFY_RETURN_TYPE: {
zend_arg_info *ret_info = op_array->arg_info - 1;
if (!ZEND_TYPE_CONTAINS_CODE(ret_info->type, Z_TYPE_P(val))
|| (op_array->fn_flags & ZEND_ACC_RETURN_REFERENCE)) {
return 0;
}
MAKE_NOP(opline);
/* zend_handle_loops_and_finally may inserts other oplines */
do {
++opline;
} while (opline->opcode != ZEND_RETURN && opline->opcode != ZEND_RETURN_BY_REF);
ZEND_ASSERT(opline->op1.var == var);
break;
}
default:
break;
}
return zend_optimizer_update_op1_const(op_array, opline, val);
}
if (opline->op2_type == type &&
opline->op2.var == var) {
return zend_optimizer_update_op2_const(op_array, opline, val);
}
opline++;
}
return 1;
}
/* Update jump offsets after a jump was migrated to another opline */
void zend_optimizer_migrate_jump(zend_op_array *op_array, zend_op *new_opline, zend_op *opline) {
switch (new_opline->opcode) {
case ZEND_JMP:
case ZEND_FAST_CALL:
ZEND_SET_OP_JMP_ADDR(new_opline, new_opline->op1, ZEND_OP1_JMP_ADDR(opline));
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_JMP_SET:
case ZEND_COALESCE:
case ZEND_ASSERT_CHECK:
case ZEND_JMP_NULL:
case ZEND_BIND_INIT_STATIC_OR_JMP:
case ZEND_JMP_FRAMELESS:
ZEND_SET_OP_JMP_ADDR(new_opline, new_opline->op2, ZEND_OP2_JMP_ADDR(opline));
break;
case ZEND_FE_FETCH_R:
case ZEND_FE_FETCH_RW:
new_opline->extended_value = ZEND_OPLINE_NUM_TO_OFFSET(op_array, new_opline, ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value));
break;
case ZEND_CATCH:
if (!(opline->extended_value & ZEND_LAST_CATCH)) {
ZEND_SET_OP_JMP_ADDR(new_opline, new_opline->op2, ZEND_OP2_JMP_ADDR(opline));
}
break;
case ZEND_SWITCH_LONG:
case ZEND_SWITCH_STRING:
case ZEND_MATCH:
{
HashTable *jumptable = Z_ARRVAL(ZEND_OP2_LITERAL(opline));
zval *zv;
ZEND_HASH_FOREACH_VAL(jumptable, zv) {
Z_LVAL_P(zv) = ZEND_OPLINE_NUM_TO_OFFSET(op_array, new_opline, ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, Z_LVAL_P(zv)));
} ZEND_HASH_FOREACH_END();
new_opline->extended_value = ZEND_OPLINE_NUM_TO_OFFSET(op_array, new_opline, ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value));
break;
}
}
}
/* Shift jump offsets based on shiftlist */
void zend_optimizer_shift_jump(zend_op_array *op_array, zend_op *opline, uint32_t *shiftlist) {
switch (opline->opcode) {
case ZEND_JMP:
case ZEND_FAST_CALL:
ZEND_SET_OP_JMP_ADDR(opline, opline->op1, ZEND_OP1_JMP_ADDR(opline) - shiftlist[ZEND_OP1_JMP_ADDR(opline) - op_array->opcodes]);
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_JMP_SET:
case ZEND_COALESCE:
case ZEND_ASSERT_CHECK:
case ZEND_JMP_NULL:
case ZEND_BIND_INIT_STATIC_OR_JMP:
case ZEND_JMP_FRAMELESS:
ZEND_SET_OP_JMP_ADDR(opline, opline->op2, ZEND_OP2_JMP_ADDR(opline) - shiftlist[ZEND_OP2_JMP_ADDR(opline) - op_array->opcodes]);
break;
case ZEND_CATCH:
if (!(opline->extended_value & ZEND_LAST_CATCH)) {
ZEND_SET_OP_JMP_ADDR(opline, opline->op2, ZEND_OP2_JMP_ADDR(opline) - shiftlist[ZEND_OP2_JMP_ADDR(opline) - op_array->opcodes]);
}
break;
case ZEND_FE_FETCH_R:
case ZEND_FE_FETCH_RW:
opline->extended_value = ZEND_OPLINE_NUM_TO_OFFSET(op_array, opline, ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value) - shiftlist[ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value)]);
break;
case ZEND_SWITCH_LONG:
case ZEND_SWITCH_STRING:
case ZEND_MATCH:
{
HashTable *jumptable = Z_ARRVAL(ZEND_OP2_LITERAL(opline));
zval *zv;
ZEND_HASH_FOREACH_VAL(jumptable, zv) {
Z_LVAL_P(zv) = ZEND_OPLINE_NUM_TO_OFFSET(op_array, opline, ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, Z_LVAL_P(zv)) - shiftlist[ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, Z_LVAL_P(zv))]);
} ZEND_HASH_FOREACH_END();
opline->extended_value = ZEND_OPLINE_NUM_TO_OFFSET(op_array, opline, ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value) - shiftlist[ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value)]);
break;
}
}
}
static bool zend_optimizer_ignore_class(zval *ce_zv, zend_string *filename)
{
zend_class_entry *ce = Z_PTR_P(ce_zv);
if (ce->ce_flags & ZEND_ACC_PRELOADED) {
Bucket *ce_bucket = (Bucket*)((uintptr_t)ce_zv - XtOffsetOf(Bucket, val));
size_t offset = ce_bucket - EG(class_table)->arData;
if (offset < EG(persistent_classes_count)) {
return false;
}
}
return ce->type == ZEND_USER_CLASS
&& (!ce->info.user.filename || ce->info.user.filename != filename);
}
static bool zend_optimizer_ignore_function(zval *fbc_zv, zend_string *filename)
{
zend_function *fbc = Z_PTR_P(fbc_zv);
if (fbc->type == ZEND_INTERNAL_FUNCTION) {
return false;
} else if (fbc->type == ZEND_USER_FUNCTION) {
if (fbc->op_array.fn_flags & ZEND_ACC_PRELOADED) {
Bucket *fbc_bucket = (Bucket*)((uintptr_t)fbc_zv - XtOffsetOf(Bucket, val));
size_t offset = fbc_bucket - EG(function_table)->arData;
if (offset < EG(persistent_functions_count)) {
return false;
}
}
return !fbc->op_array.filename || fbc->op_array.filename != filename;
} else {
ZEND_ASSERT(fbc->type == ZEND_EVAL_CODE);
return true;
}
}
zend_class_entry *zend_optimizer_get_class_entry(
const zend_script *script, const zend_op_array *op_array, zend_string *lcname) {
zend_class_entry *ce = script ? zend_hash_find_ptr(&script->class_table, lcname) : NULL;
if (ce) {
return ce;
}
zval *ce_zv = zend_hash_find(CG(class_table), lcname);
if (ce_zv && !zend_optimizer_ignore_class(ce_zv, op_array ? op_array->filename : NULL)) {
return Z_PTR_P(ce_zv);
}
if (op_array && op_array->scope && zend_string_equals_ci(op_array->scope->name, lcname)) {
return op_array->scope;
}
return NULL;
}
zend_class_entry *zend_optimizer_get_class_entry_from_op1(
const zend_script *script, const zend_op_array *op_array, const zend_op *opline) {
if (opline->op1_type == IS_CONST) {
zval *op1 = CRT_CONSTANT(opline->op1);
if (Z_TYPE_P(op1) == IS_STRING) {
return zend_optimizer_get_class_entry(script, op_array, Z_STR_P(op1 + 1));
}
} else if (opline->op1_type == IS_UNUSED && op_array->scope
&& !(op_array->scope->ce_flags & ZEND_ACC_TRAIT)
&& ((opline->op1.num & ZEND_FETCH_CLASS_MASK) == ZEND_FETCH_CLASS_SELF
|| ((opline->op1.num & ZEND_FETCH_CLASS_MASK) == ZEND_FETCH_CLASS_STATIC
&& (op_array->scope->ce_flags & ZEND_ACC_FINAL)))) {
return op_array->scope;
}
return NULL;
}
const zend_class_constant *zend_fetch_class_const_info(
const zend_script *script, const zend_op_array *op_array, const zend_op *opline, bool *is_prototype) {
const zend_class_entry *ce = NULL;
bool is_static_reference = false;
if (!opline || !op_array || opline->op2_type != IS_CONST || Z_TYPE_P(CRT_CONSTANT(opline->op2)) != IS_STRING) {
return NULL;
}
if (opline->op1_type == IS_CONST) {
zval *op1 = CRT_CONSTANT(opline->op1);
if (Z_TYPE_P(op1) == IS_STRING) {
if (script) {
ce = zend_optimizer_get_class_entry(script, op_array, Z_STR_P(op1 + 1));
} else {
zval *ce_zv = zend_hash_find(EG(class_table), Z_STR_P(op1 + 1));
if (ce_zv && !zend_optimizer_ignore_class(ce_zv, op_array->filename)) {
ce = Z_PTR_P(ce_zv);
}
}
}
} else if (opline->op1_type == IS_UNUSED
&& op_array->scope && !(op_array->scope->ce_flags & ZEND_ACC_TRAIT)
&& !(op_array->fn_flags & ZEND_ACC_TRAIT_CLONE)) {
int fetch_type = opline->op1.num & ZEND_FETCH_CLASS_MASK;
if (fetch_type == ZEND_FETCH_CLASS_SELF) {
ce = op_array->scope;
} else if (fetch_type == ZEND_FETCH_CLASS_STATIC) {
ce = op_array->scope;
is_static_reference = true;
} else if (fetch_type == ZEND_FETCH_CLASS_PARENT) {
if (op_array->scope->ce_flags & ZEND_ACC_LINKED) {
ce = op_array->scope->parent;
}
}
}
if (!ce || (ce->ce_flags & ZEND_ACC_TRAIT)) {
return NULL;
}
zend_class_constant *const_info = zend_hash_find_ptr(&ce->constants_table, Z_STR_P(CRT_CONSTANT(opline->op2)));
if (!const_info) {
return NULL;
}
if ((ZEND_CLASS_CONST_FLAGS(const_info) & ZEND_ACC_DEPRECATED)
|| ((ZEND_CLASS_CONST_FLAGS(const_info) & ZEND_ACC_PPP_MASK) != ZEND_ACC_PUBLIC && const_info->ce != op_array->scope)) {
return NULL;
}
*is_prototype = is_static_reference
&& !(const_info->ce->ce_flags & ZEND_ACC_FINAL) && !(ZEND_CLASS_CONST_FLAGS(const_info) & ZEND_ACC_FINAL);
return const_info;
}
zend_function *zend_optimizer_get_called_func(
zend_script *script, zend_op_array *op_array, zend_op *opline, bool *is_prototype)
{
*is_prototype = 0;
switch (opline->opcode) {
case ZEND_INIT_FCALL:
{
zend_string *function_name = Z_STR_P(CRT_CONSTANT(opline->op2));
zend_function *func;
zval *func_zv;
if (script && (func = zend_hash_find_ptr(&script->function_table, function_name)) != NULL) {
return func;
} else if ((func_zv = zend_hash_find(EG(function_table), function_name)) != NULL) {
if (!zend_optimizer_ignore_function(func_zv, op_array->filename)) {
return Z_PTR_P(func_zv);
}
}
break;
}
case ZEND_INIT_FCALL_BY_NAME:
case ZEND_INIT_NS_FCALL_BY_NAME:
if (opline->op2_type == IS_CONST && Z_TYPE_P(CRT_CONSTANT(opline->op2)) == IS_STRING) {
zval *function_name = CRT_CONSTANT(opline->op2) + 1;
zend_function *func;
zval *func_zv;
if (script && (func = zend_hash_find_ptr(&script->function_table, Z_STR_P(function_name)))) {
return func;
} else if ((func_zv = zend_hash_find(EG(function_table), Z_STR_P(function_name))) != NULL) {
if (!zend_optimizer_ignore_function(func_zv, op_array->filename)) {
return Z_PTR_P(func_zv);
}
}
}
break;
case ZEND_INIT_STATIC_METHOD_CALL:
if (opline->op2_type == IS_CONST && Z_TYPE_P(CRT_CONSTANT(opline->op2)) == IS_STRING) {
zend_class_entry *ce = zend_optimizer_get_class_entry_from_op1(
script, op_array, opline);
if (ce) {
zend_string *func_name = Z_STR_P(CRT_CONSTANT(opline->op2) + 1);
zend_function *fbc = zend_hash_find_ptr(&ce->function_table, func_name);
if (fbc) {
bool is_public = (fbc->common.fn_flags & ZEND_ACC_PUBLIC) != 0;
bool same_scope = fbc->common.scope == op_array->scope;
if (is_public || same_scope) {
return fbc;
}
}
}
}
break;
case ZEND_INIT_METHOD_CALL:
if (opline->op1_type == IS_UNUSED
&& opline->op2_type == IS_CONST && Z_TYPE_P(CRT_CONSTANT(opline->op2)) == IS_STRING
&& op_array->scope
&& !(op_array->fn_flags & ZEND_ACC_TRAIT_CLONE)
&& !(op_array->scope->ce_flags & ZEND_ACC_TRAIT)) {
zend_string *method_name = Z_STR_P(CRT_CONSTANT(opline->op2) + 1);
zend_function *fbc = zend_hash_find_ptr(
&op_array->scope->function_table, method_name);
if (fbc) {
bool is_private = (fbc->common.fn_flags & ZEND_ACC_PRIVATE) != 0;
if (is_private) {
/* Only use private method if in the same scope. We can't even use it
* as a prototype, as it may be overridden with changed signature. */
bool same_scope = fbc->common.scope == op_array->scope;
return same_scope ? fbc : NULL;
}
/* Prototype methods are potentially overridden. fbc still contains useful type information.
* Some optimizations may not be applied, like inlining or inferring the send-mode of superfluous args.
* A method cannot be overridden if the class or method is final. */
if ((fbc->common.fn_flags & ZEND_ACC_FINAL) == 0 &&
(fbc->common.scope->ce_flags & ZEND_ACC_FINAL) == 0) {
*is_prototype = true;
}
return fbc;
}
}
break;
case ZEND_INIT_PARENT_PROPERTY_HOOK_CALL: {
zend_class_entry *scope = op_array->scope;
ZEND_ASSERT(scope != NULL);
if ((scope->ce_flags & ZEND_ACC_LINKED) && scope->parent) {
zend_class_entry *parent_scope = scope->parent;
zend_string *prop_name = Z_STR_P(CRT_CONSTANT(opline->op1));
zend_property_hook_kind hook_kind = opline->op2.num;
zend_property_info *prop_info = zend_get_property_info(parent_scope, prop_name, /* silent */ true);
if (prop_info
&& prop_info != ZEND_WRONG_PROPERTY_INFO
&& !(prop_info->flags & ZEND_ACC_PRIVATE)
&& prop_info->hooks) {
zend_function *fbc = prop_info->hooks[hook_kind];
if (fbc) {
*is_prototype = false;
return fbc;
}
}
}
break;
}
case ZEND_NEW:
{
zend_class_entry *ce = zend_optimizer_get_class_entry_from_op1(
script, op_array, opline);
if (ce && ce->type == ZEND_USER_CLASS) {
return ce->constructor;
}
break;
}
}
return NULL;
}
uint32_t zend_optimizer_classify_function(zend_string *name, uint32_t num_args) {
if (zend_string_equals_literal(name, "extract")) {
return ZEND_FUNC_INDIRECT_VAR_ACCESS;
} else if (zend_string_equals_literal(name, "compact")) {
return ZEND_FUNC_INDIRECT_VAR_ACCESS;
} else if (zend_string_equals_literal(name, "get_defined_vars")) {
return ZEND_FUNC_INDIRECT_VAR_ACCESS;
} else if (zend_string_equals_literal(name, "db2_execute")) {
return ZEND_FUNC_INDIRECT_VAR_ACCESS;
} else if (zend_string_equals_literal(name, "func_num_args")) {
return ZEND_FUNC_VARARG;
} else if (zend_string_equals_literal(name, "func_get_arg")) {
return ZEND_FUNC_VARARG;
} else if (zend_string_equals_literal(name, "func_get_args")) {
return ZEND_FUNC_VARARG;
} else {
return 0;
}
}
zend_op *zend_optimizer_get_loop_var_def(const zend_op_array *op_array, zend_op *free_opline) {
uint32_t var = free_opline->op1.var;
ZEND_ASSERT(zend_optimizer_is_loop_var_free(free_opline));
while (--free_opline >= op_array->opcodes) {
if ((free_opline->result_type & (IS_TMP_VAR|IS_VAR)) && free_opline->result.var == var) {
return free_opline;
}
}
return NULL;
}
static void zend_optimize(zend_op_array *op_array,
zend_optimizer_ctx *ctx)
{
if (op_array->type == ZEND_EVAL_CODE) {
return;
}
if (ctx->debug_level & ZEND_DUMP_BEFORE_OPTIMIZER) {
zend_dump_op_array(op_array, ZEND_DUMP_LIVE_RANGES, "before optimizer", NULL);
}
/* pass 1 (Simple local optimizations)
* - persistent constant substitution (true, false, null, etc)
* - constant casting (ADD expects numbers, CONCAT strings, etc)
* - constant expression evaluation
* - optimize constant conditional JMPs
* - pre-evaluate constant function calls
* - eliminate FETCH $GLOBALS followed by FETCH_DIM/UNSET_DIM/ISSET_ISEMPTY_DIM
*/
if (ZEND_OPTIMIZER_PASS_1 & ctx->optimization_level) {
zend_optimizer_pass1(op_array, ctx);
if (ctx->debug_level & ZEND_DUMP_AFTER_PASS_1) {
zend_dump_op_array(op_array, 0, "after pass 1", NULL);
}
}
/* pass 3: (Jump optimization)
* - optimize series of JMPs
*/
if (ZEND_OPTIMIZER_PASS_3 & ctx->optimization_level) {
zend_optimizer_pass3(op_array, ctx);
if (ctx->debug_level & ZEND_DUMP_AFTER_PASS_3) {
zend_dump_op_array(op_array, 0, "after pass 3", NULL);
}
}
/* pass 4:
* - INIT_FCALL_BY_NAME -> DO_FCALL
*/
if (ZEND_OPTIMIZER_PASS_4 & ctx->optimization_level) {
zend_optimize_func_calls(op_array, ctx);
if (ctx->debug_level & ZEND_DUMP_AFTER_PASS_4) {
zend_dump_op_array(op_array, 0, "after pass 4", NULL);
}
}
/* pass 5:
* - CFG optimization
*/
if (ZEND_OPTIMIZER_PASS_5 & ctx->optimization_level) {
zend_optimize_cfg(op_array, ctx);
if (ctx->debug_level & ZEND_DUMP_AFTER_PASS_5) {
zend_dump_op_array(op_array, 0, "after pass 5", NULL);
}
}
/* pass 6:
* - DFA optimization
*/
if ((ZEND_OPTIMIZER_PASS_6 & ctx->optimization_level) &&
!(ZEND_OPTIMIZER_PASS_7 & ctx->optimization_level)) {
zend_optimize_dfa(op_array, ctx);
if (ctx->debug_level & ZEND_DUMP_AFTER_PASS_6) {
zend_dump_op_array(op_array, 0, "after pass 6", NULL);
}
}
/* pass 9:
* - Optimize temp variables usage
*/
if ((ZEND_OPTIMIZER_PASS_9 & ctx->optimization_level) &&
!(ZEND_OPTIMIZER_PASS_7 & ctx->optimization_level)) {
zend_optimize_temporary_variables(op_array, ctx);
if (ctx->debug_level & ZEND_DUMP_AFTER_PASS_9) {
zend_dump_op_array(op_array, 0, "after pass 9", NULL);
}
}
/* pass 10:
* - remove NOPs
*/
if (((ZEND_OPTIMIZER_PASS_10|ZEND_OPTIMIZER_PASS_5) & ctx->optimization_level) == ZEND_OPTIMIZER_PASS_10) {
zend_optimizer_nop_removal(op_array, ctx);
if (ctx->debug_level & ZEND_DUMP_AFTER_PASS_10) {
zend_dump_op_array(op_array, 0, "after pass 10", NULL);
}
}
/* pass 11:
* - Compact literals table
*/
if ((ZEND_OPTIMIZER_PASS_11 & ctx->optimization_level) &&
(!(ZEND_OPTIMIZER_PASS_6 & ctx->optimization_level) ||
!(ZEND_OPTIMIZER_PASS_7 & ctx->optimization_level))) {
zend_optimizer_compact_literals(op_array, ctx);
if (ctx->debug_level & ZEND_DUMP_AFTER_PASS_11) {
zend_dump_op_array(op_array, 0, "after pass 11", NULL);
}
}
if ((ZEND_OPTIMIZER_PASS_13 & ctx->optimization_level) &&
(!(ZEND_OPTIMIZER_PASS_6 & ctx->optimization_level) ||
!(ZEND_OPTIMIZER_PASS_7 & ctx->optimization_level))) {
zend_optimizer_compact_vars(op_array);
if (ctx->debug_level & ZEND_DUMP_AFTER_PASS_13) {
zend_dump_op_array(op_array, 0, "after pass 13", NULL);
}
}
if (ZEND_OPTIMIZER_PASS_7 & ctx->optimization_level) {
return;
}
if (ctx->debug_level & ZEND_DUMP_AFTER_OPTIMIZER) {
zend_dump_op_array(op_array, 0, "after optimizer", NULL);
}
}
static void zend_revert_pass_two(zend_op_array *op_array)
{
zend_op *opline, *end;
ZEND_ASSERT((op_array->fn_flags & ZEND_ACC_DONE_PASS_TWO) != 0);
opline = op_array->opcodes;
end = opline + op_array->last;
while (opline < end) {
if (opline->op1_type == IS_CONST) {
ZEND_PASS_TWO_UNDO_CONSTANT(op_array, opline, opline->op1);
}
if (opline->op2_type == IS_CONST) {
ZEND_PASS_TWO_UNDO_CONSTANT(op_array, opline, opline->op2);
}
/* reset smart branch flags IS_SMART_BRANCH_JMP[N]Z */
opline->result_type &= (IS_TMP_VAR|IS_VAR|IS_CV|IS_CONST);
opline++;
}
#if !ZEND_USE_ABS_CONST_ADDR
if (op_array->literals) {
zval *literals = emalloc(sizeof(zval) * op_array->last_literal);
memcpy(literals, op_array->literals, sizeof(zval) * op_array->last_literal);
op_array->literals = literals;
}
#endif
op_array->fn_flags &= ~ZEND_ACC_DONE_PASS_TWO;
}
static void zend_redo_pass_two(zend_op_array *op_array)
{
zend_op *opline, *end;
#if ZEND_USE_ABS_JMP_ADDR && !ZEND_USE_ABS_CONST_ADDR
zend_op *old_opcodes = op_array->opcodes;
#endif
ZEND_ASSERT((op_array->fn_flags & ZEND_ACC_DONE_PASS_TWO) == 0);
#if !ZEND_USE_ABS_CONST_ADDR
if (op_array->last_literal) {
op_array->opcodes = (zend_op *) erealloc(op_array->opcodes,
ZEND_MM_ALIGNED_SIZE_EX(sizeof(zend_op) * op_array->last, 16) +
sizeof(zval) * op_array->last_literal);
memcpy(((char*)op_array->opcodes) + ZEND_MM_ALIGNED_SIZE_EX(sizeof(zend_op) * op_array->last, 16),
op_array->literals, sizeof(zval) * op_array->last_literal);
efree(op_array->literals);
op_array->literals = (zval*)(((char*)op_array->opcodes) + ZEND_MM_ALIGNED_SIZE_EX(sizeof(zend_op) * op_array->last, 16));
} else {
if (op_array->literals) {
efree(op_array->literals);
}
op_array->literals = NULL;
}
#endif
opline = op_array->opcodes;
end = opline + op_array->last;
while (opline < end) {
if (opline->op1_type == IS_CONST) {
ZEND_PASS_TWO_UPDATE_CONSTANT(op_array, opline, opline->op1);
}
if (opline->op2_type == IS_CONST) {
ZEND_PASS_TWO_UPDATE_CONSTANT(op_array, opline, opline->op2);
}
/* fix jumps to point to new array */
switch (opline->opcode) {
#if ZEND_USE_ABS_JMP_ADDR && !ZEND_USE_ABS_CONST_ADDR
case ZEND_JMP:
case ZEND_FAST_CALL:
opline->op1.jmp_addr = &op_array->opcodes[opline->op1.jmp_addr - old_opcodes];
break;
case ZEND_JMPZ:
case ZEND_JMPNZ:
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
case ZEND_JMP_SET:
case ZEND_COALESCE:
case ZEND_FE_RESET_R:
case ZEND_FE_RESET_RW:
case ZEND_ASSERT_CHECK:
case ZEND_JMP_NULL:
case ZEND_BIND_INIT_STATIC_OR_JMP:
case ZEND_JMP_FRAMELESS:
opline->op2.jmp_addr = &op_array->opcodes[opline->op2.jmp_addr - old_opcodes];
break;
case ZEND_CATCH:
if (!(opline->extended_value & ZEND_LAST_CATCH)) {
opline->op2.jmp_addr = &op_array->opcodes[opline->op2.jmp_addr - old_opcodes];
}
break;
case ZEND_FE_FETCH_R:
case ZEND_FE_FETCH_RW:
case ZEND_SWITCH_LONG:
case ZEND_SWITCH_STRING:
case ZEND_MATCH:
/* relative extended_value don't have to be changed */
break;
#endif
case ZEND_IS_IDENTICAL:
case ZEND_IS_NOT_IDENTICAL:
case ZEND_IS_EQUAL:
case ZEND_IS_NOT_EQUAL:
case ZEND_IS_SMALLER:
case ZEND_IS_SMALLER_OR_EQUAL:
case ZEND_CASE:
case ZEND_CASE_STRICT:
case ZEND_ISSET_ISEMPTY_CV:
case ZEND_ISSET_ISEMPTY_VAR:
case ZEND_ISSET_ISEMPTY_DIM_OBJ:
case ZEND_ISSET_ISEMPTY_PROP_OBJ:
case ZEND_ISSET_ISEMPTY_STATIC_PROP:
case ZEND_INSTANCEOF:
case ZEND_TYPE_CHECK:
case ZEND_DEFINED:
case ZEND_IN_ARRAY:
case ZEND_ARRAY_KEY_EXISTS:
if (opline->result_type & IS_TMP_VAR) {
/* reinitialize result_type of smart branch instructions */
if (opline + 1 < end) {
if ((opline+1)->opcode == ZEND_JMPZ
&& (opline+1)->op1_type == IS_TMP_VAR
&& (opline+1)->op1.var == opline->result.var) {
opline->result_type = IS_SMART_BRANCH_JMPZ | IS_TMP_VAR;
} else if ((opline+1)->opcode == ZEND_JMPNZ
&& (opline+1)->op1_type == IS_TMP_VAR
&& (opline+1)->op1.var == opline->result.var) {
opline->result_type = IS_SMART_BRANCH_JMPNZ | IS_TMP_VAR;
}
}
}
break;
}
ZEND_VM_SET_OPCODE_HANDLER(opline);
opline++;
}
op_array->fn_flags |= ZEND_ACC_DONE_PASS_TWO;
}
static void zend_redo_pass_two_ex(zend_op_array *op_array, zend_ssa *ssa)
{
zend_op *opline, *end;
#if ZEND_USE_ABS_JMP_ADDR && !ZEND_USE_ABS_CONST_ADDR
zend_op *old_opcodes = op_array->opcodes;
#endif
ZEND_ASSERT((op_array->fn_flags & ZEND_ACC_DONE_PASS_TWO) == 0);
#if !ZEND_USE_ABS_CONST_ADDR
if (op_array->last_literal) {
op_array->opcodes = (zend_op *) erealloc(op_array->opcodes,
ZEND_MM_ALIGNED_SIZE_EX(sizeof(zend_op) * op_array->last, 16) +
sizeof(zval) * op_array->last_literal);
memcpy(((char*)op_array->opcodes) + ZEND_MM_ALIGNED_SIZE_EX(sizeof(zend_op) * op_array->last, 16),
op_array->literals, sizeof(zval) * op_array->last_literal);
efree(op_array->literals);
op_array->literals = (zval*)(((char*)op_array->opcodes) + ZEND_MM_ALIGNED_SIZE_EX(sizeof(zend_op) * op_array->last, 16));
} else {
if (op_array->literals) {
efree(op_array->literals);
}
op_array->literals = NULL;
}
#endif
opline = op_array->opcodes;
end = opline + op_array->last;
while (opline < end) {
zend_ssa_op *ssa_op = &ssa->ops[opline - op_array->opcodes];
uint32_t op1_info = opline->op1_type == IS_UNUSED ? 0 : (OP1_INFO() & (MAY_BE_UNDEF|MAY_BE_ANY|MAY_BE_REF|MAY_BE_ARRAY_OF_ANY|MAY_BE_ARRAY_KEY_ANY));
uint32_t op2_info = opline->op1_type == IS_UNUSED ? 0 : (OP2_INFO() & (MAY_BE_UNDEF|MAY_BE_ANY|MAY_BE_REF|MAY_BE_ARRAY_OF_ANY|MAY_BE_ARRAY_KEY_ANY));
uint32_t res_info =
(opline->opcode == ZEND_PRE_INC ||
opline->opcode == ZEND_PRE_DEC ||
opline->opcode == ZEND_POST_INC ||
opline->opcode == ZEND_POST_DEC) ?
((ssa->ops[opline - op_array->opcodes].op1_def >= 0) ? (OP1_DEF_INFO() & (MAY_BE_UNDEF|MAY_BE_ANY|MAY_BE_REF|MAY_BE_ARRAY_OF_ANY|MAY_BE_ARRAY_KEY_ANY)) : MAY_BE_ANY) :
(opline->result_type == IS_UNUSED ? 0 : (RES_INFO() & (MAY_BE_UNDEF|MAY_BE_ANY|MAY_BE_REF|MAY_BE_ARRAY_OF_ANY|MAY_BE_ARRAY_KEY_ANY)));
if (opline->op1_type == IS_CONST) {
ZEND_PASS_TWO_UPDATE_CONSTANT(op_array, opline, opline->op1);
}
if (opline->op2_type == IS_CONST) {
ZEND_PASS_TWO_UPDATE_CONSTANT(op_array, opline, opline->op2);
}
/* fix jumps to point to new array */
switch (opline->opcode) {
#if ZEND_USE_ABS_JMP_ADDR && !ZEND_USE_ABS_CONST_ADDR
case ZEND_JMP:
case ZEND_FAST_CALL:
opline->op1.jmp_addr = &op_array->opcodes[opline->op1.jmp_addr - old_opcodes];
break;
case ZEND_JMPZ:
case ZEND_JMPNZ:
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
case ZEND_JMP_SET:
case ZEND_COALESCE:
case ZEND_FE_RESET_R:
case ZEND_FE_RESET_RW:
case ZEND_ASSERT_CHECK:
case ZEND_JMP_NULL:
case ZEND_BIND_INIT_STATIC_OR_JMP:
case ZEND_JMP_FRAMELESS:
opline->op2.jmp_addr = &op_array->opcodes[opline->op2.jmp_addr - old_opcodes];
break;
case ZEND_CATCH:
if (!(opline->extended_value & ZEND_LAST_CATCH)) {
opline->op2.jmp_addr = &op_array->opcodes[opline->op2.jmp_addr - old_opcodes];
}
break;
case ZEND_FE_FETCH_R:
case ZEND_FE_FETCH_RW:
case ZEND_SWITCH_LONG:
case ZEND_SWITCH_STRING:
case ZEND_MATCH:
/* relative extended_value don't have to be changed */
break;
#endif
case ZEND_IS_IDENTICAL:
case ZEND_IS_NOT_IDENTICAL:
case ZEND_IS_EQUAL:
case ZEND_IS_NOT_EQUAL:
case ZEND_IS_SMALLER:
case ZEND_IS_SMALLER_OR_EQUAL:
case ZEND_CASE:
case ZEND_CASE_STRICT:
case ZEND_ISSET_ISEMPTY_CV:
case ZEND_ISSET_ISEMPTY_VAR:
case ZEND_ISSET_ISEMPTY_DIM_OBJ:
case ZEND_ISSET_ISEMPTY_PROP_OBJ:
case ZEND_ISSET_ISEMPTY_STATIC_PROP:
case ZEND_INSTANCEOF:
case ZEND_TYPE_CHECK:
case ZEND_DEFINED:
case ZEND_IN_ARRAY:
case ZEND_ARRAY_KEY_EXISTS:
if (opline->result_type & IS_TMP_VAR) {
/* reinitialize result_type of smart branch instructions */
if (opline + 1 < end) {
if ((opline+1)->opcode == ZEND_JMPZ
&& (opline+1)->op1_type == IS_TMP_VAR
&& (opline+1)->op1.var == opline->result.var) {
opline->result_type = IS_SMART_BRANCH_JMPZ | IS_TMP_VAR;
} else if ((opline+1)->opcode == ZEND_JMPNZ
&& (opline+1)->op1_type == IS_TMP_VAR
&& (opline+1)->op1.var == opline->result.var) {
opline->result_type = IS_SMART_BRANCH_JMPNZ | IS_TMP_VAR;
}
}
}
break;
}
#ifdef ZEND_VERIFY_TYPE_INFERENCE
if (ssa_op->op1_use >= 0) {
opline->op1_use_type = ssa->var_info[ssa_op->op1_use].type;
}
if (ssa_op->op2_use >= 0) {
opline->op2_use_type = ssa->var_info[ssa_op->op2_use].type;
}
if (ssa_op->result_use >= 0) {
opline->result_use_type = ssa->var_info[ssa_op->result_use].type;
}
if (ssa_op->op1_def >= 0) {
opline->op1_def_type = ssa->var_info[ssa_op->op1_def].type;
}
if (ssa_op->op2_def >= 0) {
opline->op2_def_type = ssa->var_info[ssa_op->op2_def].type;
}
if (ssa_op->result_def >= 0) {
opline->result_def_type = ssa->var_info[ssa_op->result_def].type;
}
#endif
zend_vm_set_opcode_handler_ex(opline, op1_info, op2_info, res_info);
opline++;
}
op_array->fn_flags |= ZEND_ACC_DONE_PASS_TWO;
}
static void zend_optimize_op_array(zend_op_array *op_array,
zend_optimizer_ctx *ctx)
{
/* Revert pass_two() */
zend_revert_pass_two(op_array);
/* Do actual optimizations */
zend_optimize(op_array, ctx);
/* Redo pass_two() */
zend_redo_pass_two(op_array);
if (op_array->live_range) {
zend_recalc_live_ranges(op_array, NULL);
}
}
static void zend_adjust_fcall_stack_size(zend_op_array *op_array, zend_optimizer_ctx *ctx)
{
zend_function *func;
zend_op *opline, *end;
opline = op_array->opcodes;
end = opline + op_array->last;
while (opline < end) {
if (opline->opcode == ZEND_INIT_FCALL) {
func = zend_hash_find_ptr(
&ctx->script->function_table,
Z_STR_P(RT_CONSTANT(opline, opline->op2)));
if (func) {
opline->op1.num = zend_vm_calc_used_stack(opline->extended_value, func);
}
}
opline++;
}
}
static void zend_adjust_fcall_stack_size_graph(zend_op_array *op_array)
{
zend_func_info *func_info = ZEND_FUNC_INFO(op_array);
if (func_info) {
zend_call_info *call_info =func_info->callee_info;
while (call_info) {
zend_op *opline = call_info->caller_init_opline;
if (opline && call_info->callee_func && opline->opcode == ZEND_INIT_FCALL) {
ZEND_ASSERT(!call_info->is_prototype);
opline->op1.num = zend_vm_calc_used_stack(opline->extended_value, call_info->callee_func);
}
call_info = call_info->next_callee;
}
}
}
static bool needs_live_range(zend_op_array *op_array, zend_op *def_opline) {
zend_func_info *func_info = ZEND_FUNC_INFO(op_array);
zend_ssa_op *ssa_op = &func_info->ssa.ops[def_opline - op_array->opcodes];
int ssa_var = ssa_op->result_def;
if (ssa_var < 0) {
/* Be conservative. */
return 1;
}
/* If the variable is used by a PHI, this may be the assignment of the final branch of a
* ternary/etc structure. While this is where the live range starts, the value from the other
* branch may also be used. As such, use the type of the PHI node for the following check. */
if (func_info->ssa.vars[ssa_var].phi_use_chain) {
ssa_var = func_info->ssa.vars[ssa_var].phi_use_chain->ssa_var;
}
uint32_t type = func_info->ssa.var_info[ssa_var].type;
return (type & (MAY_BE_STRING|MAY_BE_ARRAY|MAY_BE_OBJECT|MAY_BE_RESOURCE|MAY_BE_REF)) != 0;
}
static void zend_foreach_op_array_helper(
zend_op_array *op_array, zend_op_array_func_t func, void *context) {
func(op_array, context);
for (uint32_t i = 0; i < op_array->num_dynamic_func_defs; i++) {
zend_foreach_op_array_helper(op_array->dynamic_func_defs[i], func, context);
}
}
void zend_foreach_op_array(zend_script *script, zend_op_array_func_t func, void *context)
{
zval *zv;
zend_op_array *op_array;
zend_foreach_op_array_helper(&script->main_op_array, func, context);
ZEND_HASH_MAP_FOREACH_PTR(&script->function_table, op_array) {
zend_foreach_op_array_helper(op_array, func, context);
} ZEND_HASH_FOREACH_END();
ZEND_HASH_MAP_FOREACH_VAL(&script->class_table, zv) {
if (Z_TYPE_P(zv) == IS_ALIAS_PTR) {
continue;
}
zend_class_entry *ce = Z_CE_P(zv);
ZEND_HASH_MAP_FOREACH_PTR(&ce->function_table, op_array) {
if (op_array->scope == ce
&& op_array->type == ZEND_USER_FUNCTION
&& !(op_array->fn_flags & ZEND_ACC_ABSTRACT)
&& !(op_array->fn_flags & ZEND_ACC_TRAIT_CLONE)) {
zend_foreach_op_array_helper(op_array, func, context);
}
} ZEND_HASH_FOREACH_END();
zend_property_info *property;
ZEND_HASH_MAP_FOREACH_PTR(&ce->properties_info, property) {
zend_function **hooks = property->hooks;
if (property->ce == ce && property->hooks) {
for (uint32_t i = 0; i < ZEND_PROPERTY_HOOK_COUNT; i++) {
zend_function *hook = hooks[i];
if (hook && hook->common.scope == ce && !(hooks[i]->op_array.fn_flags & ZEND_ACC_TRAIT_CLONE)) {
zend_foreach_op_array_helper(&hooks[i]->op_array, func, context);
}
}
}
} ZEND_HASH_FOREACH_END();
} ZEND_HASH_FOREACH_END();
}
static void step_optimize_op_array(zend_op_array *op_array, void *context) {
zend_optimize_op_array(op_array, (zend_optimizer_ctx *) context);
}
static void step_adjust_fcall_stack_size(zend_op_array *op_array, void *context) {
zend_adjust_fcall_stack_size(op_array, (zend_optimizer_ctx *) context);
}
static void step_dump_after_optimizer(zend_op_array *op_array, void *context) {
zend_dump_op_array(op_array, ZEND_DUMP_LIVE_RANGES, "after optimizer", NULL);
}
static void zend_optimizer_call_registered_passes(zend_script *script, void *ctx) {
for (int i = 0; i < zend_optimizer_registered_passes.last; i++) {
if (!zend_optimizer_registered_passes.pass[i]) {
continue;
}
zend_optimizer_registered_passes.pass[i](script, ctx);
}
}
ZEND_API void zend_optimize_script(zend_script *script, zend_long optimization_level, zend_long debug_level)
{
zend_op_array *op_array;
zend_string *name;
zend_optimizer_ctx ctx;
zval *zv;
ctx.arena = zend_arena_create(64 * 1024);
ctx.script = script;
ctx.constants = NULL;
ctx.optimization_level = optimization_level;
ctx.debug_level = debug_level;
if ((ZEND_OPTIMIZER_PASS_6 & optimization_level) &&
(ZEND_OPTIMIZER_PASS_7 & optimization_level)) {
/* Optimize using call-graph */
zend_call_graph call_graph;
zend_build_call_graph(&ctx.arena, script, &call_graph);
int i;
zend_func_info *func_info;
for (i = 0; i < call_graph.op_arrays_count; i++) {
zend_revert_pass_two(call_graph.op_arrays[i]);
zend_optimize(call_graph.op_arrays[i], &ctx);
}
zend_analyze_call_graph(&ctx.arena, script, &call_graph);
for (i = 0; i < call_graph.op_arrays_count; i++) {
func_info = ZEND_FUNC_INFO(call_graph.op_arrays[i]);
if (func_info) {
func_info->call_map = zend_build_call_map(&ctx.arena, func_info, call_graph.op_arrays[i]);
if (call_graph.op_arrays[i]->fn_flags & ZEND_ACC_HAS_RETURN_TYPE) {
zend_init_func_return_info(call_graph.op_arrays[i], script, &func_info->return_info);
}
}
}
for (i = 0; i < call_graph.op_arrays_count; i++) {
func_info = ZEND_FUNC_INFO(call_graph.op_arrays[i]);
if (func_info) {
if (zend_dfa_analyze_op_array(call_graph.op_arrays[i], &ctx, &func_info->ssa) == SUCCESS) {
func_info->flags = func_info->ssa.cfg.flags;
} else {
ZEND_SET_FUNC_INFO(call_graph.op_arrays[i], NULL);
}
}
}
//TODO: perform inner-script inference???
for (i = 0; i < call_graph.op_arrays_count; i++) {
func_info = ZEND_FUNC_INFO(call_graph.op_arrays[i]);
if (func_info) {
zend_dfa_optimize_op_array(call_graph.op_arrays[i], &ctx, &func_info->ssa, func_info->call_map);
}
}
if (debug_level & ZEND_DUMP_AFTER_PASS_7) {
for (i = 0; i < call_graph.op_arrays_count; i++) {
zend_dump_op_array(call_graph.op_arrays[i], 0, "after pass 7", NULL);
}
}
if (ZEND_OPTIMIZER_PASS_9 & optimization_level) {
for (i = 0; i < call_graph.op_arrays_count; i++) {
zend_optimize_temporary_variables(call_graph.op_arrays[i], &ctx);
if (debug_level & ZEND_DUMP_AFTER_PASS_9) {
zend_dump_op_array(call_graph.op_arrays[i], 0, "after pass 9", NULL);
}
}
}
if (ZEND_OPTIMIZER_PASS_11 & optimization_level) {
for (i = 0; i < call_graph.op_arrays_count; i++) {
zend_optimizer_compact_literals(call_graph.op_arrays[i], &ctx);
if (debug_level & ZEND_DUMP_AFTER_PASS_11) {
zend_dump_op_array(call_graph.op_arrays[i], 0, "after pass 11", NULL);
}
}
}
if (ZEND_OPTIMIZER_PASS_13 & optimization_level) {
for (i = 0; i < call_graph.op_arrays_count; i++) {
zend_optimizer_compact_vars(call_graph.op_arrays[i]);
if (debug_level & ZEND_DUMP_AFTER_PASS_13) {
zend_dump_op_array(call_graph.op_arrays[i], 0, "after pass 13", NULL);
}
}
}
if (ZEND_OPTIMIZER_PASS_12 & optimization_level) {
for (i = 0; i < call_graph.op_arrays_count; i++) {
zend_adjust_fcall_stack_size_graph(call_graph.op_arrays[i]);
}
}
for (i = 0; i < call_graph.op_arrays_count; i++) {
op_array = call_graph.op_arrays[i];
func_info = ZEND_FUNC_INFO(op_array);
if (func_info && func_info->ssa.var_info) {
zend_redo_pass_two_ex(op_array, &func_info->ssa);
if (op_array->live_range) {
zend_recalc_live_ranges(op_array, needs_live_range);
}
} else {
zend_redo_pass_two(op_array);
if (op_array->live_range) {
zend_recalc_live_ranges(op_array, NULL);
}
}
}
for (i = 0; i < call_graph.op_arrays_count; i++) {
ZEND_SET_FUNC_INFO(call_graph.op_arrays[i], NULL);
}
} else {
zend_foreach_op_array(script, step_optimize_op_array, &ctx);
if (ZEND_OPTIMIZER_PASS_12 & optimization_level) {
zend_foreach_op_array(script, step_adjust_fcall_stack_size, &ctx);
}
}
ZEND_HASH_MAP_FOREACH_VAL(&script->class_table, zv) {
if (Z_TYPE_P(zv) == IS_ALIAS_PTR) {
continue;
}
zend_class_entry *ce = Z_CE_P(zv);
ZEND_HASH_MAP_FOREACH_STR_KEY_PTR(&ce->function_table, name, op_array) {
if (op_array->scope != ce && op_array->type == ZEND_USER_FUNCTION) {
zend_op_array *orig_op_array =
zend_hash_find_ptr(&op_array->scope->function_table, name);
ZEND_ASSERT(orig_op_array != NULL);
if (orig_op_array != op_array) {
uint32_t fn_flags = op_array->fn_flags;
zend_function *prototype = op_array->prototype;
HashTable *ht = op_array->static_variables;
*op_array = *orig_op_array;
op_array->fn_flags = fn_flags;
op_array->prototype = prototype;
op_array->static_variables = ht;
}
}
} ZEND_HASH_FOREACH_END();
} ZEND_HASH_FOREACH_END();
zend_optimizer_call_registered_passes(script, &ctx);
if ((debug_level & ZEND_DUMP_AFTER_OPTIMIZER) &&
(ZEND_OPTIMIZER_PASS_7 & optimization_level)) {
zend_foreach_op_array(script, step_dump_after_optimizer, NULL);
}
if (ctx.constants) {
zend_hash_destroy(ctx.constants);
}
zend_arena_destroy(ctx.arena);
}
ZEND_API int zend_optimizer_register_pass(zend_optimizer_pass_t pass)
{
if (!pass) {
return -1;
}
if (zend_optimizer_registered_passes.last == ZEND_OPTIMIZER_MAX_REGISTERED_PASSES) {
return -1;
}
zend_optimizer_registered_passes.pass[
zend_optimizer_registered_passes.last++] = pass;
return zend_optimizer_registered_passes.last;
}
ZEND_API void zend_optimizer_unregister_pass(int idx)
{
zend_optimizer_registered_passes.pass[idx-1] = NULL;
}
zend_result zend_optimizer_startup(void)
{
return zend_func_info_startup();
}
zend_result zend_optimizer_shutdown(void)
{
return zend_func_info_shutdown();
}