/* [<][>][^][v][top][bottom][index][help] */
DEFINITIONS
This source file includes following definitions.
- zend_optimizer_lookup_cv
- zend_optimizer_add_literal
- update_op1_const
- update_op2_const
- replace_tmp_by_const
- zend_optimizer
/*
+----------------------------------------------------------------------+
| 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 |
| license@php.net so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andi Gutmans <andi@zend.com> |
| Zeev Suraski <zeev@zend.com> |
| Stanislav Malyshev <stas@zend.com> |
| Dmitry Stogov <dmitry@zend.com> |
+----------------------------------------------------------------------+
*/
#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"
#define OPTIMIZATION_LEVEL \
ZCG(accel_directives).optimization_level
#if ZEND_EXTENSION_API_NO >= PHP_5_5_X_API_NO
static int zend_optimizer_lookup_cv(zend_op_array *op_array, char* name, int name_len)
{
int i = 0;
ulong hash_value = zend_inline_hash_func(name, name_len+1);
while (i < op_array->last_var) {
if (op_array->vars[i].name == name ||
(op_array->vars[i].hash_value == hash_value &&
op_array->vars[i].name_len == name_len &&
memcmp(op_array->vars[i].name, name, name_len) == 0)) {
return i;
}
i++;
}
i = op_array->last_var;
op_array->last_var++;
op_array->vars = erealloc(op_array->vars, op_array->last_var * sizeof(zend_compiled_variable));
if (IS_INTERNED(name)) {
op_array->vars[i].name = name;
} else {
op_array->vars[i].name = estrndup(name, name_len);
}
op_array->vars[i].name_len = name_len;
op_array->vars[i].hash_value = hash_value;
return i;
}
#endif
#if ZEND_EXTENSION_API_NO > PHP_5_3_X_API_NO
int zend_optimizer_add_literal(zend_op_array *op_array, const zval *zv TSRMLS_DC)
{
int i = op_array->last_literal;
op_array->last_literal++;
if (i >= CG(context).literals_size) {
CG(context).literals_size += 16; /* FIXME */
op_array->literals = (zend_literal*)erealloc(op_array->literals, CG(context).literals_size * sizeof(zend_literal));
}
op_array->literals[i].constant = *zv;
op_array->literals[i].hash_value = 0;
op_array->literals[i].cache_slot = -1;
Z_SET_REFCOUNT(op_array->literals[i].constant, 2);
Z_SET_ISREF(op_array->literals[i].constant);
return i;
}
# define LITERAL_LONG(op, val) do { \
zval _c; \
ZVAL_LONG(&_c, val); \
op.constant = zend_optimizer_add_literal(op_array, &_c TSRMLS_CC); \
} while (0)
# define LITERAL_BOOL(op, val) do { \
zval _c; \
ZVAL_BOOL(&_c, val); \
op.constant = zend_optimizer_add_literal(op_array, &_c TSRMLS_CC); \
} while (0)
# define literal_dtor(zv) do { \
zval_dtor(zv); \
Z_TYPE_P(zv) = IS_NULL; \
} while (0)
#define COPY_NODE(target, src) do { \
target ## _type = src ## _type; \
target = src; \
} while (0)
#else
# define LITERAL_LONG(op, val) ZVAL_LONG(&op.u.constant, val)
# define LITERAL_BOOL(op, val) ZVAL_BOOL(&op.u.constant, val)
# define literal_dtor(zv) zval_dtor(zv)
#define COPY_NODE(target, src) do { \
target = src; \
} while (0)
#endif
static void update_op1_const(zend_op_array *op_array,
zend_op *opline,
zval *val TSRMLS_DC)
{
if (opline->opcode == ZEND_FREE) {
MAKE_NOP(opline);
zval_dtor(val);
} else {
ZEND_OP1_TYPE(opline) = IS_CONST;
#if ZEND_EXTENSION_API_NO > PHP_5_3_X_API_NO
if (Z_TYPE_P(val) == IS_STRING) {
switch (opline->opcode) {
case ZEND_INIT_STATIC_METHOD_CALL:
case ZEND_CATCH:
case ZEND_FETCH_CONSTANT:
opline->op1.constant = zend_optimizer_add_literal(op_array, val TSRMLS_CC);
Z_HASH_P(&ZEND_OP1_LITERAL(opline)) = zend_hash_func(Z_STRVAL(ZEND_OP1_LITERAL(opline)), Z_STRLEN(ZEND_OP1_LITERAL(opline)) + 1);
op_array->literals[opline->op1.constant].cache_slot = op_array->last_cache_slot++;
zend_str_tolower(Z_STRVAL_P(val), Z_STRLEN_P(val));
zend_optimizer_add_literal(op_array, val TSRMLS_CC);
op_array->literals[opline->op1.constant+1].hash_value = zend_hash_func(Z_STRVAL(op_array->literals[opline->op1.constant+1].constant), Z_STRLEN(op_array->literals[opline->op1.constant+1].constant) + 1);
break;
case ZEND_DO_FCALL:
zend_str_tolower(Z_STRVAL_P(val), Z_STRLEN_P(val));
opline->op1.constant = zend_optimizer_add_literal(op_array, val TSRMLS_CC);
Z_HASH_P(&ZEND_OP1_LITERAL(opline)) = zend_hash_func(Z_STRVAL(ZEND_OP1_LITERAL(opline)), Z_STRLEN(ZEND_OP1_LITERAL(opline)) + 1);
op_array->literals[opline->op1.constant].cache_slot = op_array->last_cache_slot++;
break;
default:
opline->op1.constant = zend_optimizer_add_literal(op_array, val TSRMLS_CC);
Z_HASH_P(&ZEND_OP1_LITERAL(opline)) = zend_hash_func(Z_STRVAL(ZEND_OP1_LITERAL(opline)), Z_STRLEN(ZEND_OP1_LITERAL(opline)) + 1);
break;
}
} else {
opline->op1.constant = zend_optimizer_add_literal(op_array, val TSRMLS_CC);
}
#else
ZEND_OP1_LITERAL(opline) = *val;
#endif
}
}
static void update_op2_const(zend_op_array *op_array,
zend_op *opline,
zval *val TSRMLS_DC)
{
ZEND_OP2_TYPE(opline) = IS_CONST;
#if ZEND_EXTENSION_API_NO > PHP_5_3_X_API_NO
opline->op2.constant = zend_optimizer_add_literal(op_array, val TSRMLS_CC);
if (Z_TYPE_P(val) == IS_STRING) {
Z_HASH_P(&ZEND_OP2_LITERAL(opline)) = zend_hash_func(Z_STRVAL(ZEND_OP2_LITERAL(opline)), Z_STRLEN(ZEND_OP2_LITERAL(opline)) + 1);
switch (opline->opcode) {
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_FETCH_CLASS:
case ZEND_INIT_FCALL_BY_NAME:
/*case ZEND_INIT_NS_FCALL_BY_NAME:*/
case ZEND_UNSET_VAR:
case ZEND_ISSET_ISEMPTY_VAR:
case ZEND_ADD_INTERFACE:
case ZEND_ADD_TRAIT:
op_array->literals[opline->op2.constant].cache_slot = op_array->last_cache_slot++;
zend_str_tolower(Z_STRVAL_P(val), Z_STRLEN_P(val));
zend_optimizer_add_literal(op_array, val TSRMLS_CC);
op_array->literals[opline->op2.constant+1].hash_value = zend_hash_func(Z_STRVAL(op_array->literals[opline->op2.constant+1].constant), Z_STRLEN(op_array->literals[opline->op2.constant+1].constant) + 1);
break;
case ZEND_INIT_METHOD_CALL:
case ZEND_INIT_STATIC_METHOD_CALL:
zend_str_tolower(Z_STRVAL_P(val), Z_STRLEN_P(val));
zend_optimizer_add_literal(op_array, val TSRMLS_CC);
op_array->literals[opline->op2.constant+1].hash_value = zend_hash_func(Z_STRVAL(op_array->literals[opline->op2.constant+1].constant), Z_STRLEN(op_array->literals[opline->op2.constant+1].constant) + 1);
/* break missing intentionally */
/*case ZEND_FETCH_CONSTANT:*/
case ZEND_ASSIGN_OBJ:
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_ISSET_ISEMPTY_PROP_OBJ:
op_array->literals[opline->op2.constant].cache_slot = op_array->last_cache_slot;
op_array->last_cache_slot += 2;
break;
case ZEND_ASSIGN_ADD:
case ZEND_ASSIGN_SUB:
case ZEND_ASSIGN_MUL:
case ZEND_ASSIGN_DIV:
case ZEND_ASSIGN_MOD:
case ZEND_ASSIGN_SL:
case ZEND_ASSIGN_SR:
case ZEND_ASSIGN_CONCAT:
case ZEND_ASSIGN_BW_OR:
case ZEND_ASSIGN_BW_AND:
case ZEND_ASSIGN_BW_XOR:
if (opline->extended_value == ZEND_ASSIGN_OBJ) {
op_array->literals[opline->op2.constant].cache_slot = op_array->last_cache_slot;
op_array->last_cache_slot += 2;
}
break;
#if ZEND_EXTENSION_API_NO >= PHP_5_4_X_API_NO
case ZEND_OP_DATA:
if ((opline-1)->opcode == ZEND_ASSIGN_DIM ||
((opline-1)->extended_value == ZEND_ASSIGN_DIM &&
((opline-1)->opcode == ZEND_ASSIGN_ADD ||
(opline-1)->opcode == ZEND_ASSIGN_SUB ||
(opline-1)->opcode == ZEND_ASSIGN_MUL ||
(opline-1)->opcode == ZEND_ASSIGN_DIV ||
(opline-1)->opcode == ZEND_ASSIGN_MOD ||
(opline-1)->opcode == ZEND_ASSIGN_SL ||
(opline-1)->opcode == ZEND_ASSIGN_SR ||
(opline-1)->opcode == ZEND_ASSIGN_CONCAT ||
(opline-1)->opcode == ZEND_ASSIGN_BW_OR ||
(opline-1)->opcode == ZEND_ASSIGN_BW_AND ||
(opline-1)->opcode == ZEND_ASSIGN_BW_XOR))) {
goto check_numeric;
}
break;
case ZEND_ISSET_ISEMPTY_DIM_OBJ:
case ZEND_ADD_ARRAY_ELEMENT:
case ZEND_INIT_ARRAY:
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_DIM_TMP_VAR:
check_numeric:
{
ulong index;
int numeric = 0;
ZEND_HANDLE_NUMERIC_EX(Z_STRVAL_P(val), Z_STRLEN_P(val)+1, index, numeric = 1);
if (numeric) {
zval_dtor(val);
ZVAL_LONG(val, index);
op_array->literals[opline->op2.constant].constant = *val;
}
}
break;
#endif
default:
break;
}
}
#else
ZEND_OP2_LITERAL(opline) = *val;
#endif
}
static void replace_tmp_by_const(zend_op_array *op_array,
zend_op *opline,
zend_uint var,
zval *val
TSRMLS_DC)
{
zend_op *end = op_array->opcodes + op_array->last;
while (opline < end) {
if (ZEND_OP1_TYPE(opline) == IS_TMP_VAR &&
ZEND_OP1(opline).var == var) {
/* In most cases IS_TMP_VAR operand may be used only once.
* The operands are usually destroyed by the opcode handler.
* ZEND_CASE is an exception, that keeps operand unchanged,
* and allows its reuse. The number of ZEND_CASE instructions
* usually terminated by ZEND_FREE that finally kills the value.
*/
if (opline->opcode == ZEND_CASE || opline->opcode == ZEND_FREE) {
zend_op *m, *n;
int brk = op_array->last_brk_cont;
zend_bool in_switch = 0;
while (brk--) {
if (op_array->brk_cont_array[brk].start <= (opline - op_array->opcodes) &&
op_array->brk_cont_array[brk].brk > (opline - op_array->opcodes)) {
in_switch = 1;
break;
}
}
if (!in_switch) {
MAKE_NOP(opline);
zval_dtor(val);
break;
}
m = opline;
n = op_array->opcodes + op_array->brk_cont_array[brk].brk + 1;
while (m < n) {
if (ZEND_OP1_TYPE(m) == IS_TMP_VAR &&
ZEND_OP1(m).var == var) {
if (m->opcode == ZEND_CASE) {
zval old_val;
old_val = *val;
zval_copy_ctor(val);
update_op1_const(op_array, m, val TSRMLS_CC);
*val = old_val;
} else if (m->opcode == ZEND_FREE) {
MAKE_NOP(m);
} else {
ZEND_ASSERT(0);
}
}
m++;
}
zval_dtor(val);
break;
} else {
update_op1_const(op_array, opline, val TSRMLS_CC);
break;
}
}
if (ZEND_OP2_TYPE(opline) == IS_TMP_VAR &&
ZEND_OP2(opline).var == var) {
update_op2_const(op_array, opline, val TSRMLS_CC);
/* TMP_VAR may be used only once */
break;
}
opline++;
}
}
#include "Optimizer/nop_removal.c"
#include "Optimizer/block_pass.c"
#include "Optimizer/optimize_temp_vars_5.c"
void zend_optimizer(zend_op_array *op_array TSRMLS_DC)
{
if (op_array->type == ZEND_EVAL_CODE ||
(op_array->fn_flags & ZEND_ACC_INTERACTIVE)) {
return;
}
/* pass 1
* - substitute persistent constants (true, false, null, etc)
* - perform compile-time evaluation of constant binary and unary operations
* - optimize series of ADD_STRING and/or ADD_CHAR
* - convert CAST(IS_BOOL,x) into BOOL(x)
* - convert INTI_FCALL_BY_NAME + DO_FCALL_BY_NAME into DO_FCALL
*/
#include "Optimizer/pass1_5.c"
/* pass 2:
* - convert non-numeric constants to numeric constants in numeric operators
* - optimize constant conditional JMPs
* - optimize static BRKs and CONTs
*/
#include "Optimizer/pass2.c"
/* pass 3:
* - optimize $i = $i+expr to $i+=expr
* - optimize series of JMPs
* - change $i++ to ++$i where possible
*/
#include "Optimizer/pass3.c"
/* pass 5:
* - CFG optimization
*/
#include "Optimizer/pass5.c"
/* pass 9:
* - Optimize temp variables usage
*/
#include "Optimizer/pass9.c"
/* pass 10:
* - remove NOPs
*/
#include "Optimizer/pass10.c"
}