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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 |
| [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 "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"
#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};
static void zend_optimizer_zval_dtor_wrapper(zval *zvalue)
{
zval_ptr_dtor_nogc(zvalue);
}
void zend_optimizer_collect_constant(zend_optimizer_ctx *ctx, zval *name, zval* value)
{
zval val;
if (!ctx->constants) {
ctx->constants = zend_arena_alloc(&ctx->arena, sizeof(HashTable));
zend_hash_init(ctx->constants, 16, NULL, zend_optimizer_zval_dtor_wrapper, 0);
}
ZVAL_COPY(&val, value);
zend_hash_add(ctx->constants, Z_STR_P(name), &val);
}
int zend_optimizer_eval_binary_op(zval *result, zend_uchar 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);
}
/* }}} */
int zend_optimizer_eval_unary_op(zval *result, zend_uchar 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;
}
}
/* }}} */
int zend_optimizer_eval_cast(zval *result, uint32_t type, zval *op1) /* {{{ */
{
switch (type) {
case IS_NULL:
ZVAL_NULL(result);
return SUCCESS;
case _IS_BOOL:
ZVAL_BOOL(result, zval_is_true(op1));
return SUCCESS;
case IS_LONG:
ZVAL_LONG(result, zval_get_long(op1));
return SUCCESS;
case IS_DOUBLE:
ZVAL_DOUBLE(result, zval_get_double(op1));
return SUCCESS;
case IS_STRING:
/* Conversion from double to string takes into account run-time
'precision' setting and cannot be evaluated at compile-time */
if (Z_TYPE_P(op1) != IS_ARRAY && Z_TYPE_P(op1) != IS_DOUBLE) {
ZVAL_STR(result, zval_get_string(op1));
return SUCCESS;
}
break;
case IS_ARRAY:
ZVAL_COPY(result, op1);
convert_to_array(result);
return SUCCESS;
}
return FAILURE;
}
/* }}} */
int zend_optimizer_eval_strlen(zval *result, zval *op1) /* {{{ */
{
if (Z_TYPE_P(op1) != IS_STRING) {
return FAILURE;
}
ZVAL_LONG(result, Z_STRLEN_P(op1));
return SUCCESS;
}
/* }}} */
int 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;
}
int zend_optimizer_add_literal(zend_op_array *op_array, 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)
int 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:
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_SEPARATE:
case ZEND_SEND_VAR_NO_REF:
case ZEND_SEND_VAR_NO_REF_EX:
return 0;
case ZEND_VERIFY_RETURN_TYPE:
/* This would require a non-local change.
* zend_optimizer_replace_by_const() supports this. */
return 0;
case ZEND_CASE:
case ZEND_CASE_STRICT:
case ZEND_FETCH_LIST_R:
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:
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;
}
int 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:
if ((opline + 1)->opcode == ZEND_INSTANCEOF &&
(opline + 1)->op2.var == opline->result.var) {
return 0;
}
ZEND_FALLTHROUGH;
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:
case ZEND_ASSIGN_OBJ_OP:
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_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;
}
int zend_optimizer_replace_by_const(zend_op_array *op_array,
zend_op *opline,
zend_uchar 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) {
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_SEPARATE:
case ZEND_RETURN_BY_REF:
return 0;
case ZEND_SEND_VAR:
opline->extended_value = 0;
opline->opcode = ZEND_SEND_VAL;
break;
case ZEND_SEND_VAR_EX:
case ZEND_SEND_FUNC_ARG:
opline->extended_value = 0;
opline->opcode = ZEND_SEND_VAL_EX;
break;
case ZEND_SEND_VAR_NO_REF:
return 0;
case ZEND_SEND_VAR_NO_REF_EX:
opline->opcode = ZEND_SEND_VAL;
break;
case ZEND_SEND_USER:
opline->opcode = ZEND_SEND_VAL_EX;
break;
/* In most cases IS_TMP_VAR operand may be used only once.
* The operands are usually destroyed by the opcode handler.
* ZEND_CASE[_STRICT] and ZEND_FETCH_LIST_R are exceptions, they keeps operand
* unchanged, and allows its reuse. these instructions
* usually terminated by ZEND_FREE that finally kills the value.
*/
case ZEND_FETCH_LIST_R: {
zend_op *m = opline;
do {
if (m->opcode == ZEND_FETCH_LIST_R &&
m->op1_type == type &&
m->op1.var == var) {
zval v;
ZVAL_COPY(&v, val);
if (Z_TYPE(v) == IS_STRING) {
zend_string_hash_val(Z_STR(v));
}
m->op1.constant = zend_optimizer_add_literal(op_array, &v);
m->op1_type = IS_CONST;
}
m++;
} while (m->opcode != ZEND_FREE || m->op1_type != type || m->op1.var != var);
ZEND_ASSERT(m->opcode == ZEND_FREE && m->op1_type == type && m->op1.var == var);
MAKE_NOP(m);
zval_ptr_dtor_nogc(val);
return 1;
}
case ZEND_SWITCH_LONG:
case ZEND_SWITCH_STRING:
case ZEND_MATCH:
case ZEND_CASE:
case ZEND_CASE_STRICT: {
zend_op *end = op_array->opcodes + op_array->last;
while (opline < end) {
if (opline->op1_type == type && opline->op1.var == var) {
if (
opline->opcode == ZEND_CASE
|| opline->opcode == ZEND_CASE_STRICT
|| opline->opcode == ZEND_SWITCH_LONG
|| opline->opcode == ZEND_SWITCH_STRING
|| opline->opcode == ZEND_MATCH
) {
zval v;
if (opline->opcode == ZEND_CASE) {
opline->opcode = ZEND_IS_EQUAL;
} else if (opline->opcode == ZEND_CASE_STRICT) {
opline->opcode = ZEND_IS_IDENTICAL;
}
ZVAL_COPY(&v, val);
if (Z_TYPE(v) == IS_STRING) {
zend_string_hash_val(Z_STR(v));
}
opline->op1.constant = zend_optimizer_add_literal(op_array, &v);
opline->op1_type = IS_CONST;
} else if (opline->opcode == ZEND_FREE) {
if (opline->extended_value == ZEND_FREE_SWITCH) {
/* We found the end of the switch. */
MAKE_NOP(opline);
break;
}
ZEND_ASSERT(opline->extended_value == ZEND_FREE_ON_RETURN);
MAKE_NOP(opline);
} else {
ZEND_UNREACHABLE();
}
}
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_JMPZNZ:
new_opline->extended_value = ZEND_OPLINE_NUM_TO_OFFSET(op_array, new_opline, ZEND_OFFSET_TO_OPLINE_NUM(op_array, opline, opline->extended_value));
ZEND_FALLTHROUGH;
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:
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_JMPZNZ:
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)]);
ZEND_FALLTHROUGH;
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:
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;
}
}
}
zend_class_entry *zend_optimizer_get_class_entry(const zend_script *script, zend_string *lcname) {
zend_class_entry *ce = script ? zend_hash_find_ptr(&script->class_table, lcname) : NULL;
if (ce) {
return ce;
}
ce = zend_hash_find_ptr(CG(class_table), lcname);
if (ce && ce->type == ZEND_INTERNAL_CLASS) {
return ce;
}
return NULL;
}
static zend_class_entry *get_class_entry_from_op1(
zend_script *script, zend_op_array *op_array, 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, 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) {
return op_array->scope;
}
return NULL;
}
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;
if (script && (func = zend_hash_find_ptr(&script->function_table, function_name)) != NULL) {
return func;
} else if ((func = zend_hash_find_ptr(EG(function_table), function_name)) != NULL) {
if (func->type == ZEND_INTERNAL_FUNCTION) {
return func;
} else if (func->type == ZEND_USER_FUNCTION &&
func->op_array.filename &&
func->op_array.filename == op_array->filename) {
return func;
}
}
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;
if (script && (func = zend_hash_find_ptr(&script->function_table, Z_STR_P(function_name)))) {
return func;
} else if ((func = zend_hash_find_ptr(EG(function_table), Z_STR_P(function_name))) != NULL) {
if (func->type == ZEND_INTERNAL_FUNCTION) {
return func;
} else if (func->type == ZEND_USER_FUNCTION &&
func->op_array.filename &&
func->op_array.filename == op_array->filename) {
return func;
}
}
}
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 = 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;
bool is_final = (fbc->common.fn_flags & ZEND_ACC_FINAL) != 0;
bool same_scope = fbc->common.scope == op_array->scope;
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. */
return same_scope ? fbc : NULL;
}
/* If the method is non-final, it may be overridden,
* but only with a compatible method signature. */
*is_prototype = !is_final;
return fbc;
}
}
break;
case ZEND_NEW:
{
zend_class_entry *ce = 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_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);
}
}