mirror of
https://github.com/php/php-src.git
synced 2025-01-24 04:33:39 +08:00
01b3fc03c3
1. Update: http://www.php.net/license/3_01.txt to https, as there is anyway server header "Location:" to https. 2. Update few license 3.0 to 3.01 as 3.0 states "php 5.1.1, 4.1.1, and earlier". 3. In some license comments is "at through the world-wide-web" while most is without "at", so deleted. 4. fixed indentation in some files before |
106 lines
3.7 KiB
C
106 lines
3.7 KiB
C
/*
|
|
+----------------------------------------------------------------------+
|
|
| 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> |
|
|
+----------------------------------------------------------------------+
|
|
*/
|
|
|
|
/* pass 10:
|
|
* - remove NOPs
|
|
*/
|
|
|
|
#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_nop_removal(zend_op_array *op_array, zend_optimizer_ctx *ctx)
|
|
{
|
|
zend_op *end, *opline;
|
|
uint32_t new_count, i, shift;
|
|
int j;
|
|
uint32_t *shiftlist;
|
|
ALLOCA_FLAG(use_heap);
|
|
|
|
shiftlist = (uint32_t *)do_alloca(sizeof(uint32_t) * op_array->last, use_heap);
|
|
i = new_count = shift = 0;
|
|
end = op_array->opcodes + op_array->last;
|
|
for (opline = op_array->opcodes; opline < end; opline++) {
|
|
|
|
/* Kill JMP-over-NOP-s */
|
|
if (opline->opcode == ZEND_JMP && ZEND_OP1_JMP_ADDR(opline) > op_array->opcodes + i) {
|
|
/* check if there are only NOPs under the branch */
|
|
zend_op *target = ZEND_OP1_JMP_ADDR(opline) - 1;
|
|
|
|
while (target->opcode == ZEND_NOP) {
|
|
target--;
|
|
}
|
|
if (target == opline) {
|
|
/* only NOPs */
|
|
opline->opcode = ZEND_NOP;
|
|
}
|
|
}
|
|
|
|
shiftlist[i++] = shift;
|
|
if (opline->opcode == ZEND_NOP) {
|
|
shift++;
|
|
} else {
|
|
if (shift) {
|
|
zend_op *new_opline = op_array->opcodes + new_count;
|
|
|
|
*new_opline = *opline;
|
|
zend_optimizer_migrate_jump(op_array, new_opline, opline);
|
|
}
|
|
new_count++;
|
|
}
|
|
}
|
|
|
|
if (shift) {
|
|
op_array->last = new_count;
|
|
end = op_array->opcodes + op_array->last;
|
|
|
|
/* update JMPs */
|
|
for (opline = op_array->opcodes; opline<end; opline++) {
|
|
zend_optimizer_shift_jump(op_array, opline, shiftlist);
|
|
}
|
|
|
|
/* update try/catch array */
|
|
for (j = 0; j < op_array->last_try_catch; j++) {
|
|
op_array->try_catch_array[j].try_op -= shiftlist[op_array->try_catch_array[j].try_op];
|
|
op_array->try_catch_array[j].catch_op -= shiftlist[op_array->try_catch_array[j].catch_op];
|
|
if (op_array->try_catch_array[j].finally_op) {
|
|
op_array->try_catch_array[j].finally_op -= shiftlist[op_array->try_catch_array[j].finally_op];
|
|
op_array->try_catch_array[j].finally_end -= shiftlist[op_array->try_catch_array[j].finally_end];
|
|
}
|
|
}
|
|
|
|
/* update early binding list */
|
|
if (op_array->fn_flags & ZEND_ACC_EARLY_BINDING) {
|
|
uint32_t *opline_num = &ctx->script->first_early_binding_opline;
|
|
|
|
ZEND_ASSERT(op_array == &ctx->script->main_op_array);
|
|
do {
|
|
*opline_num -= shiftlist[*opline_num];
|
|
opline_num = &op_array->opcodes[*opline_num].result.opline_num;
|
|
} while (*opline_num != (uint32_t)-1);
|
|
}
|
|
}
|
|
free_alloca(shiftlist, use_heap);
|
|
}
|