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pass2.c
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/*
+----------------------------------------------------------------------+
| Zend OPcache |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2017 The PHP Group |
+----------------------------------------------------------------------+
| This source file is subject to version 3.01 of the PHP license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.php.net/license/3_01.txt |
| If you did not receive a copy of the PHP license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| [email protected] so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andi Gutmans <[email protected]> |
| Zeev Suraski <[email protected]> |
| Stanislav Malyshev <[email protected]> |
| Dmitry Stogov <[email protected]> |
+----------------------------------------------------------------------+
*/
/* pass 2:
* - convert non-numeric constants to numeric constants in numeric operators
* - optimize constant conditional JMPs
*/
#include "php.h"
#include "Optimizer/zend_optimizer.h"
#include "Optimizer/zend_optimizer_internal.h"
#include "zend_API.h"
#include "zend_constants.h"
#include "zend_execute.h"
#include "zend_vm.h"
void zend_optimizer_pass2(zend_op_array *op_array)
{
zend_op *opline;
zend_op *end = op_array->opcodes + op_array->last;
opline = op_array->opcodes;
while (opline < end) {
switch (opline->opcode) {
case ZEND_ADD:
case ZEND_SUB:
case ZEND_MUL:
case ZEND_DIV:
case ZEND_POW:
if (opline->op1_type == IS_CONST) {
if (Z_TYPE(ZEND_OP1_LITERAL(opline)) == IS_STRING) {
/* don't optimise if it should produce a runtime numeric string error */
if (is_numeric_string(Z_STRVAL(ZEND_OP1_LITERAL(opline)), Z_STRLEN(ZEND_OP1_LITERAL(opline)), NULL, NULL, 0)) {
convert_scalar_to_number(&ZEND_OP1_LITERAL(opline));
}
}
}
/* break missing *intentionally* - the assign_op's may only optimize op2 */
case ZEND_ASSIGN_ADD:
case ZEND_ASSIGN_SUB:
case ZEND_ASSIGN_MUL:
case ZEND_ASSIGN_DIV:
case ZEND_ASSIGN_POW:
if (opline->extended_value != 0) {
/* object tristate op - don't attempt to optimize it! */
break;
}
if (opline->op2_type == IS_CONST) {
if (Z_TYPE(ZEND_OP2_LITERAL(opline)) == IS_STRING) {
/* don't optimise if it should produce a runtime numeric string error */
if (is_numeric_string(Z_STRVAL(ZEND_OP2_LITERAL(opline)), Z_STRLEN(ZEND_OP2_LITERAL(opline)), NULL, NULL, 0)) {
convert_scalar_to_number(&ZEND_OP2_LITERAL(opline));
}
}
}
break;
case ZEND_MOD:
case ZEND_SL:
case ZEND_SR:
if (opline->op1_type == IS_CONST) {
if (Z_TYPE(ZEND_OP1_LITERAL(opline)) != IS_LONG) {
/* don't optimise if it should produce a runtime numeric string error */
if (!(Z_TYPE(ZEND_OP1_LITERAL(opline)) == IS_STRING
&& !is_numeric_string(Z_STRVAL(ZEND_OP1_LITERAL(opline)), Z_STRLEN(ZEND_OP1_LITERAL(opline)), NULL, NULL, 0))) {
convert_to_long(&ZEND_OP1_LITERAL(opline));
}
}
}
/* break missing *intentionally - the assign_op's may only optimize op2 */
case ZEND_ASSIGN_MOD:
case ZEND_ASSIGN_SL:
case ZEND_ASSIGN_SR:
if (opline->extended_value != 0) {
/* object tristate op - don't attempt to optimize it! */
break;
}
if (opline->op2_type == IS_CONST) {
if (Z_TYPE(ZEND_OP2_LITERAL(opline)) != IS_LONG) {
/* don't optimise if it should produce a runtime numeric string error */
if (!(Z_TYPE(ZEND_OP2_LITERAL(opline)) == IS_STRING
&& !is_numeric_string(Z_STRVAL(ZEND_OP2_LITERAL(opline)), Z_STRLEN(ZEND_OP2_LITERAL(opline)), NULL, NULL, 0))) {
convert_to_long(&ZEND_OP2_LITERAL(opline));
}
}
}
break;
case ZEND_CONCAT:
case ZEND_FAST_CONCAT:
if (opline->op1_type == IS_CONST) {
if (Z_TYPE(ZEND_OP1_LITERAL(opline)) != IS_STRING) {
convert_to_string(&ZEND_OP1_LITERAL(opline));
}
}
/* break missing *intentionally - the assign_op's may only optimize op2 */
case ZEND_ASSIGN_CONCAT:
if (opline->extended_value != 0) {
/* object tristate op - don't attempt to optimize it! */
break;
}
if (opline->op2_type == IS_CONST) {
if (Z_TYPE(ZEND_OP2_LITERAL(opline)) != IS_STRING) {
convert_to_string(&ZEND_OP2_LITERAL(opline));
}
}
break;
case ZEND_JMPZ_EX:
case ZEND_JMPNZ_EX:
/* convert Ti = JMPZ_EX(Ti, L) to JMPZ(Ti, L) */
#if 0
/* Disabled unsafe pattern: in conjunction with
* ZEND_VM_SMART_BRANCH() this may improperly eliminate
* assignment to Ti.
*/
if (opline->op1_type == IS_TMP_VAR &&
opline->result_type == IS_TMP_VAR &&
opline->op1.var == opline->result.var) {
opline->opcode -= 3;
SET_UNUSED(opline->result);
} else
#endif
/* convert Ti = JMPZ_EX(C, L) => Ti = QM_ASSIGN(C)
in case we know it wouldn't jump */
if (opline->op1_type == IS_CONST) {
int should_jmp = zend_is_true(&ZEND_OP1_LITERAL(opline));
if (opline->opcode == ZEND_JMPZ_EX) {
should_jmp = !should_jmp;
}
if (!should_jmp) {
opline->opcode = ZEND_QM_ASSIGN;
SET_UNUSED(opline->op2);
}
}
break;
case ZEND_JMPZ:
case ZEND_JMPNZ:
if (opline->op1_type == IS_CONST) {
int should_jmp = zend_is_true(&ZEND_OP1_LITERAL(opline));
if (opline->opcode == ZEND_JMPZ) {
should_jmp = !should_jmp;
}
literal_dtor(&ZEND_OP1_LITERAL(opline));
opline->op1_type = IS_UNUSED;
if (should_jmp) {
opline->opcode = ZEND_JMP;
COPY_NODE(opline->op1, opline->op2);
} else {
MAKE_NOP(opline);
}
break;
}
if ((opline + 1)->opcode == ZEND_JMP) {
/* JMPZ(X, L1), JMP(L2) => JMPZNZ(X, L1, L2) */
/* JMPNZ(X, L1), JMP(L2) => JMPZNZ(X, L2, L1) */
if (ZEND_OP2_JMP_ADDR(opline) == ZEND_OP1_JMP_ADDR(opline + 1)) {
/* JMPZ(X, L1), JMP(L1) => NOP, JMP(L1) */
if (opline->op1_type == IS_CV) {
opline->opcode = ZEND_CHECK_VAR;
opline->op2.num = 0;
} else if (opline->op1_type & (IS_TMP_VAR|IS_VAR)) {
opline->opcode = ZEND_FREE;
opline->op2.num = 0;
} else {
MAKE_NOP(opline);
}
} else {
if (opline->opcode == ZEND_JMPZ) {
opline->extended_value = ZEND_OPLINE_TO_OFFSET(opline, ZEND_OP1_JMP_ADDR(opline + 1));
} else {
opline->extended_value = ZEND_OPLINE_TO_OFFSET(opline, ZEND_OP2_JMP_ADDR(opline));
ZEND_SET_OP_JMP_ADDR(opline, opline->op2, ZEND_OP1_JMP_ADDR(opline + 1));
}
opline->opcode = ZEND_JMPZNZ;
}
}
break;
case ZEND_JMPZNZ:
if (opline->op1_type == IS_CONST) {
zend_op *target_opline;
if (zend_is_true(&ZEND_OP1_LITERAL(opline))) {
target_opline = ZEND_OFFSET_TO_OPLINE(opline, opline->extended_value); /* JMPNZ */
} else {
target_opline = ZEND_OP2_JMP_ADDR(opline); /* JMPZ */
}
literal_dtor(&ZEND_OP1_LITERAL(opline));
ZEND_SET_OP_JMP_ADDR(opline, opline->op1, target_opline);
opline->op1_type = IS_UNUSED;
opline->opcode = ZEND_JMP;
}
break;
}
opline++;
}
}