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240 lines
7.5 KiB
C
240 lines
7.5 KiB
C
/*
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+----------------------------------------------------------------------+
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| Zend OPcache |
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+----------------------------------------------------------------------+
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| Copyright (c) 1998-2014 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 2:
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* - convert non-numeric constants to numeric constants in numeric operators
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* - optimize constant conditional JMPs
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* - optimize static BRKs and CONTs
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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_pass2(zend_op_array *op_array TSRMLS_DC)
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{
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zend_op *opline;
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zend_op *end = op_array->opcodes + op_array->last;
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opline = op_array->opcodes;
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while (opline < end) {
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switch (opline->opcode) {
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case ZEND_ADD:
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case ZEND_SUB:
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case ZEND_MUL:
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case ZEND_DIV:
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if (ZEND_OP1_TYPE(opline) == IS_CONST) {
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if (Z_TYPE(ZEND_OP1_LITERAL(opline)) == IS_STRING) {
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convert_scalar_to_number(&ZEND_OP1_LITERAL(opline) TSRMLS_CC);
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}
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}
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/* break missing *intentionally* - the assign_op's may only optimize op2 */
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case ZEND_ASSIGN_ADD:
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case ZEND_ASSIGN_SUB:
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case ZEND_ASSIGN_MUL:
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case ZEND_ASSIGN_DIV:
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if (opline->extended_value != 0) {
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/* object tristate op - don't attempt to optimize it! */
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break;
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}
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if (ZEND_OP2_TYPE(opline) == IS_CONST) {
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if (Z_TYPE(ZEND_OP2_LITERAL(opline)) == IS_STRING) {
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convert_scalar_to_number(&ZEND_OP2_LITERAL(opline) TSRMLS_CC);
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}
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}
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break;
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case ZEND_MOD:
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case ZEND_SL:
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case ZEND_SR:
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if (ZEND_OP1_TYPE(opline) == IS_CONST) {
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if (Z_TYPE(ZEND_OP1_LITERAL(opline)) != IS_LONG) {
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convert_to_long(&ZEND_OP1_LITERAL(opline));
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}
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}
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/* break missing *intentionally - the assign_op's may only optimize op2 */
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case ZEND_ASSIGN_MOD:
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case ZEND_ASSIGN_SL:
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case ZEND_ASSIGN_SR:
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if (opline->extended_value != 0) {
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/* object tristate op - don't attempt to optimize it! */
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break;
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}
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if (ZEND_OP2_TYPE(opline) == IS_CONST) {
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if (Z_TYPE(ZEND_OP2_LITERAL(opline)) != IS_LONG) {
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convert_to_long(&ZEND_OP2_LITERAL(opline));
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}
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}
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break;
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case ZEND_CONCAT:
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if (ZEND_OP1_TYPE(opline) == IS_CONST) {
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if (Z_TYPE(ZEND_OP1_LITERAL(opline)) != IS_STRING) {
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convert_to_string(&ZEND_OP1_LITERAL(opline));
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}
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}
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/* break missing *intentionally - the assign_op's may only optimize op2 */
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case ZEND_ASSIGN_CONCAT:
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if (opline->extended_value != 0) {
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/* object tristate op - don't attempt to optimize it! */
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break;
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}
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if (ZEND_OP2_TYPE(opline) == IS_CONST) {
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if (Z_TYPE(ZEND_OP2_LITERAL(opline)) != IS_STRING) {
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convert_to_string(&ZEND_OP2_LITERAL(opline));
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}
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}
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break;
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case ZEND_JMPZ_EX:
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case ZEND_JMPNZ_EX:
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/* convert Ti = JMPZ_EX(Ti, L) to JMPZ(Ti, L) */
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if (0 && /* FIXME: temporary disable unsafe pattern */
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ZEND_OP1_TYPE(opline) == IS_TMP_VAR &&
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ZEND_RESULT_TYPE(opline) == IS_TMP_VAR &&
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ZEND_OP1(opline).var == ZEND_RESULT(opline).var) {
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opline->opcode -= 3;
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/* convert Ti = JMPZ_EX(C, L) => Ti = QM_ASSIGN(C)
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in case we know it wouldn't jump */
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} else if (ZEND_OP1_TYPE(opline) == IS_CONST) {
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int should_jmp = zend_is_true(&ZEND_OP1_LITERAL(opline) TSRMLS_CC);
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if (opline->opcode == ZEND_JMPZ_EX) {
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should_jmp = !should_jmp;
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}
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if (!should_jmp) {
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opline->opcode = ZEND_QM_ASSIGN;
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SET_UNUSED(opline->op2);
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}
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}
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break;
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case ZEND_JMPZ:
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case ZEND_JMPNZ:
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if (ZEND_OP1_TYPE(opline) == IS_CONST) {
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int should_jmp = zend_is_true(&ZEND_OP1_LITERAL(opline) TSRMLS_CC);
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if (opline->opcode == ZEND_JMPZ) {
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should_jmp = !should_jmp;
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}
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literal_dtor(&ZEND_OP1_LITERAL(opline));
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ZEND_OP1_TYPE(opline) = IS_UNUSED;
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if (should_jmp) {
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opline->opcode = ZEND_JMP;
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COPY_NODE(opline->op1, opline->op2);
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} else {
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MAKE_NOP(opline);
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}
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break;
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}
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if ((opline + 1)->opcode == ZEND_JMP) {
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/* JMPZ(X, L1), JMP(L2) => JMPZNZ(X, L1, L2) */
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/* JMPNZ(X, L1), JMP(L2) => JMPZNZ(X, L2, L1) */
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if (ZEND_OP2(opline).opline_num == ZEND_OP1(opline + 1).opline_num) {
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/* JMPZ(X, L1), JMP(L1) => NOP, JMP(L1) */
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MAKE_NOP(opline);
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} else {
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if (opline->opcode == ZEND_JMPZ) {
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opline->extended_value = ZEND_OP1(opline + 1).opline_num;
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} else {
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opline->extended_value = ZEND_OP2(opline).opline_num;
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COPY_NODE(opline->op2, (opline + 1)->op1);
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}
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opline->opcode = ZEND_JMPZNZ;
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}
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}
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break;
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case ZEND_JMPZNZ:
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if (ZEND_OP1_TYPE(opline) == IS_CONST) {
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int opline_num;
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if (zend_is_true(&ZEND_OP1_LITERAL(opline) TSRMLS_CC)) {
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opline_num = opline->extended_value; /* JMPNZ */
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} else {
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opline_num = ZEND_OP2(opline).opline_num; /* JMPZ */
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}
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literal_dtor(&ZEND_OP1_LITERAL(opline));
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ZEND_OP1(opline).opline_num = opline_num;
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ZEND_OP1_TYPE(opline) = IS_UNUSED;
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opline->opcode = ZEND_JMP;
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}
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break;
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case ZEND_BRK:
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case ZEND_CONT:
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{
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zend_brk_cont_element *jmp_to;
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int array_offset;
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int nest_levels;
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int dont_optimize = 0;
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if (ZEND_OP2_TYPE(opline) != IS_CONST) {
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break;
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}
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convert_to_long(&ZEND_OP2_LITERAL(opline));
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nest_levels = ZEND_OP2_LITERAL(opline).value.lval;
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array_offset = ZEND_OP1(opline).opline_num;
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while (1) {
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if (array_offset == -1) {
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dont_optimize = 1; /* don't optimize this bogus break/continue, let the executor shout */
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break;
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}
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jmp_to = &op_array->brk_cont_array[array_offset];
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array_offset = jmp_to->parent;
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if (--nest_levels > 0) {
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if (opline->opcode == ZEND_BRK &&
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op_array->opcodes[jmp_to->brk].opcode == ZEND_FREE) {
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dont_optimize = 1;
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break;
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}
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} else {
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break;
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}
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}
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if (dont_optimize) {
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break;
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}
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/* optimize - convert to a JMP */
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switch (opline->opcode) {
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case ZEND_BRK:
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MAKE_NOP(opline);
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ZEND_OP1(opline).opline_num = jmp_to->brk;
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break;
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case ZEND_CONT:
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MAKE_NOP(opline);
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ZEND_OP1(opline).opline_num = jmp_to->cont;
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break;
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}
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opline->opcode = ZEND_JMP;
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/* MAKE_NOP() already set op1 and op2 to IS_UNUSED */
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}
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break;
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}
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opline++;
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}
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}
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