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111 lines
3.9 KiB
C
111 lines
3.9 KiB
C
/*
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+----------------------------------------------------------------------+
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| Zend OPcache |
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+----------------------------------------------------------------------+
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| Copyright (c) 1998-2017 The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.php.net/license/3_01.txt |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Andi Gutmans <andi@zend.com> |
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| Zeev Suraski <zeev@zend.com> |
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| Stanislav Malyshev <stas@zend.com> |
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| Dmitry Stogov <dmitry@zend.com> |
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+----------------------------------------------------------------------+
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*/
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/* pass 10:
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* - remove NOPs
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*/
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#include "php.h"
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#include "Optimizer/zend_optimizer.h"
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#include "Optimizer/zend_optimizer_internal.h"
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#include "zend_API.h"
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#include "zend_constants.h"
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#include "zend_execute.h"
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#include "zend_vm.h"
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void zend_optimizer_nop_removal(zend_op_array *op_array)
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{
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zend_op *end, *opline;
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uint32_t new_count, i, shift;
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int j;
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uint32_t *shiftlist;
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ALLOCA_FLAG(use_heap);
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shiftlist = (uint32_t *)do_alloca(sizeof(uint32_t) * op_array->last, use_heap);
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i = new_count = shift = 0;
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end = op_array->opcodes + op_array->last;
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for (opline = op_array->opcodes; opline < end; opline++) {
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/* Kill JMP-over-NOP-s */
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if (opline->opcode == ZEND_JMP && ZEND_OP1_JMP_ADDR(opline) > op_array->opcodes + i) {
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/* check if there are only NOPs under the branch */
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zend_op *target = ZEND_OP1_JMP_ADDR(opline) - 1;
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while (target->opcode == ZEND_NOP) {
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target--;
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}
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if (target == opline) {
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/* only NOPs */
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opline->opcode = ZEND_NOP;
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}
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}
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shiftlist[i++] = shift;
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if (opline->opcode == ZEND_NOP) {
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shift++;
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} else {
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if (shift) {
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zend_op *new_opline = op_array->opcodes + new_count;
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*new_opline = *opline;
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zend_optimizer_migrate_jump(op_array, new_opline, opline);
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}
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new_count++;
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}
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}
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if (shift) {
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op_array->last = new_count;
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end = op_array->opcodes + op_array->last;
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/* update JMPs */
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for (opline = op_array->opcodes; opline<end; opline++) {
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zend_optimizer_shift_jump(op_array, opline, shiftlist);
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}
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/* update brk/cont array */
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for (j = 0; j < op_array->last_live_range; j++) {
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op_array->live_range[j].start -= shiftlist[op_array->live_range[j].start];
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op_array->live_range[j].end -= shiftlist[op_array->live_range[j].end];
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}
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/* update try/catch array */
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for (j = 0; j < op_array->last_try_catch; j++) {
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op_array->try_catch_array[j].try_op -= shiftlist[op_array->try_catch_array[j].try_op];
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op_array->try_catch_array[j].catch_op -= shiftlist[op_array->try_catch_array[j].catch_op];
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if (op_array->try_catch_array[j].finally_op) {
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op_array->try_catch_array[j].finally_op -= shiftlist[op_array->try_catch_array[j].finally_op];
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op_array->try_catch_array[j].finally_end -= shiftlist[op_array->try_catch_array[j].finally_end];
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}
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}
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/* update early binding list */
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if (op_array->early_binding != (uint32_t)-1) {
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uint32_t *opline_num = &op_array->early_binding;
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do {
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*opline_num -= shiftlist[*opline_num];
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opline_num = &ZEND_RESULT(&op_array->opcodes[*opline_num]).opline_num;
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} while (*opline_num != (uint32_t)-1);
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}
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}
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free_alloca(shiftlist, use_heap);
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}
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