If input string was cons-string it might undergo short-circuiting during GC. This does not change input start if underlying seq-string (first element of cons-string) does not move but this makes input-string pointer on the native regexp's frame invalid. R=lrn@chromium.org Review URL: http://codereview.chromium.org/8343001 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9697 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
1291 lines
42 KiB
C++
1291 lines
42 KiB
C++
// Copyright 2011 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "v8.h"
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#if defined(V8_TARGET_ARCH_IA32)
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#include "unicode.h"
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#include "log.h"
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#include "regexp-stack.h"
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#include "macro-assembler.h"
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#include "regexp-macro-assembler.h"
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#include "ia32/regexp-macro-assembler-ia32.h"
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namespace v8 {
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namespace internal {
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#ifndef V8_INTERPRETED_REGEXP
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/*
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* This assembler uses the following register assignment convention
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* - edx : current character. Must be loaded using LoadCurrentCharacter
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* before using any of the dispatch methods.
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* - edi : current position in input, as negative offset from end of string.
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* Please notice that this is the byte offset, not the character offset!
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* - esi : end of input (points to byte after last character in input).
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* - ebp : frame pointer. Used to access arguments, local variables and
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* RegExp registers.
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* - esp : points to tip of C stack.
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* - ecx : points to tip of backtrack stack
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*
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* The registers eax and ebx are free to use for computations.
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*
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* Each call to a public method should retain this convention.
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* The stack will have the following structure:
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* - Isolate* isolate (Address of the current isolate)
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* - direct_call (if 1, direct call from JavaScript code, if 0
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* call through the runtime system)
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* - stack_area_base (High end of the memory area to use as
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* backtracking stack)
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* - int* capture_array (int[num_saved_registers_], for output).
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* - end of input (Address of end of string)
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* - start of input (Address of first character in string)
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* - start index (character index of start)
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* - String* input_string (location of a handle containing the string)
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* --- frame alignment (if applicable) ---
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* - return address
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* ebp-> - old ebp
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* - backup of caller esi
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* - backup of caller edi
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* - backup of caller ebx
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* - Offset of location before start of input (effectively character
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* position -1). Used to initialize capture registers to a non-position.
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* - register 0 ebp[-4] (Only positions must be stored in the first
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* - register 1 ebp[-8] num_saved_registers_ registers)
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* - ...
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*
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* The first num_saved_registers_ registers are initialized to point to
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* "character -1" in the string (i.e., char_size() bytes before the first
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* character of the string). The remaining registers starts out as garbage.
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*
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* The data up to the return address must be placed there by the calling
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* code, by calling the code entry as cast to a function with the signature:
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* int (*match)(String* input_string,
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* int start_index,
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* Address start,
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* Address end,
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* int* capture_output_array,
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* bool at_start,
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* byte* stack_area_base,
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* bool direct_call)
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*/
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#define __ ACCESS_MASM(masm_)
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RegExpMacroAssemblerIA32::RegExpMacroAssemblerIA32(
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Mode mode,
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int registers_to_save)
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: masm_(new MacroAssembler(Isolate::Current(), NULL, kRegExpCodeSize)),
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mode_(mode),
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num_registers_(registers_to_save),
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num_saved_registers_(registers_to_save),
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entry_label_(),
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start_label_(),
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success_label_(),
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backtrack_label_(),
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exit_label_() {
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ASSERT_EQ(0, registers_to_save % 2);
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__ jmp(&entry_label_); // We'll write the entry code later.
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__ bind(&start_label_); // And then continue from here.
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}
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RegExpMacroAssemblerIA32::~RegExpMacroAssemblerIA32() {
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delete masm_;
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// Unuse labels in case we throw away the assembler without calling GetCode.
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entry_label_.Unuse();
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start_label_.Unuse();
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success_label_.Unuse();
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backtrack_label_.Unuse();
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exit_label_.Unuse();
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check_preempt_label_.Unuse();
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stack_overflow_label_.Unuse();
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}
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int RegExpMacroAssemblerIA32::stack_limit_slack() {
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return RegExpStack::kStackLimitSlack;
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}
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void RegExpMacroAssemblerIA32::AdvanceCurrentPosition(int by) {
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if (by != 0) {
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__ add(edi, Immediate(by * char_size()));
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}
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}
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void RegExpMacroAssemblerIA32::AdvanceRegister(int reg, int by) {
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ASSERT(reg >= 0);
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ASSERT(reg < num_registers_);
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if (by != 0) {
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__ add(register_location(reg), Immediate(by));
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}
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}
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void RegExpMacroAssemblerIA32::Backtrack() {
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CheckPreemption();
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// Pop Code* offset from backtrack stack, add Code* and jump to location.
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Pop(ebx);
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__ add(ebx, Immediate(masm_->CodeObject()));
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__ jmp(ebx);
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}
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void RegExpMacroAssemblerIA32::Bind(Label* label) {
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__ bind(label);
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}
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void RegExpMacroAssemblerIA32::CheckCharacter(uint32_t c, Label* on_equal) {
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__ cmp(current_character(), c);
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BranchOrBacktrack(equal, on_equal);
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}
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void RegExpMacroAssemblerIA32::CheckCharacterGT(uc16 limit, Label* on_greater) {
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__ cmp(current_character(), limit);
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BranchOrBacktrack(greater, on_greater);
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}
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void RegExpMacroAssemblerIA32::CheckAtStart(Label* on_at_start) {
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Label not_at_start;
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// Did we start the match at the start of the string at all?
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__ cmp(Operand(ebp, kStartIndex), Immediate(0));
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BranchOrBacktrack(not_equal, ¬_at_start);
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// If we did, are we still at the start of the input?
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__ lea(eax, Operand(esi, edi, times_1, 0));
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__ cmp(eax, Operand(ebp, kInputStart));
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BranchOrBacktrack(equal, on_at_start);
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__ bind(¬_at_start);
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}
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void RegExpMacroAssemblerIA32::CheckNotAtStart(Label* on_not_at_start) {
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// Did we start the match at the start of the string at all?
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__ cmp(Operand(ebp, kStartIndex), Immediate(0));
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BranchOrBacktrack(not_equal, on_not_at_start);
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// If we did, are we still at the start of the input?
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__ lea(eax, Operand(esi, edi, times_1, 0));
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__ cmp(eax, Operand(ebp, kInputStart));
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BranchOrBacktrack(not_equal, on_not_at_start);
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}
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void RegExpMacroAssemblerIA32::CheckCharacterLT(uc16 limit, Label* on_less) {
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__ cmp(current_character(), limit);
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BranchOrBacktrack(less, on_less);
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}
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void RegExpMacroAssemblerIA32::CheckCharacters(Vector<const uc16> str,
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int cp_offset,
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Label* on_failure,
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bool check_end_of_string) {
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#ifdef DEBUG
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// If input is ASCII, don't even bother calling here if the string to
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// match contains a non-ascii character.
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if (mode_ == ASCII) {
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ASSERT(String::IsAscii(str.start(), str.length()));
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}
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#endif
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int byte_length = str.length() * char_size();
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int byte_offset = cp_offset * char_size();
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if (check_end_of_string) {
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// Check that there are at least str.length() characters left in the input.
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__ cmp(edi, Immediate(-(byte_offset + byte_length)));
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BranchOrBacktrack(greater, on_failure);
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}
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if (on_failure == NULL) {
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// Instead of inlining a backtrack, (re)use the global backtrack target.
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on_failure = &backtrack_label_;
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}
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// Do one character test first to minimize loading for the case that
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// we don't match at all (loading more than one character introduces that
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// chance of reading unaligned and reading across cache boundaries).
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// If the first character matches, expect a larger chance of matching the
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// string, and start loading more characters at a time.
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if (mode_ == ASCII) {
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__ cmpb(Operand(esi, edi, times_1, byte_offset),
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static_cast<int8_t>(str[0]));
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} else {
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// Don't use 16-bit immediate. The size changing prefix throws off
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// pre-decoding.
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__ movzx_w(eax,
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Operand(esi, edi, times_1, byte_offset));
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__ cmp(eax, static_cast<int32_t>(str[0]));
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}
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BranchOrBacktrack(not_equal, on_failure);
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__ lea(ebx, Operand(esi, edi, times_1, 0));
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for (int i = 1, n = str.length(); i < n;) {
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if (mode_ == ASCII) {
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if (i <= n - 4) {
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int combined_chars =
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(static_cast<uint32_t>(str[i + 0]) << 0) |
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(static_cast<uint32_t>(str[i + 1]) << 8) |
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(static_cast<uint32_t>(str[i + 2]) << 16) |
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(static_cast<uint32_t>(str[i + 3]) << 24);
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__ cmp(Operand(ebx, byte_offset + i), Immediate(combined_chars));
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i += 4;
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} else {
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__ cmpb(Operand(ebx, byte_offset + i),
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static_cast<int8_t>(str[i]));
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i += 1;
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}
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} else {
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ASSERT(mode_ == UC16);
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if (i <= n - 2) {
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__ cmp(Operand(ebx, byte_offset + i * sizeof(uc16)),
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Immediate(*reinterpret_cast<const int*>(&str[i])));
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i += 2;
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} else {
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// Avoid a 16-bit immediate operation. It uses the length-changing
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// 0x66 prefix which causes pre-decoder misprediction and pipeline
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// stalls. See
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// "Intel(R) 64 and IA-32 Architectures Optimization Reference Manual"
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// (248966.pdf) section 3.4.2.3 "Length-Changing Prefixes (LCP)"
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__ movzx_w(eax,
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Operand(ebx, byte_offset + i * sizeof(uc16)));
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__ cmp(eax, static_cast<int32_t>(str[i]));
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i += 1;
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}
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}
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BranchOrBacktrack(not_equal, on_failure);
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}
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}
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void RegExpMacroAssemblerIA32::CheckGreedyLoop(Label* on_equal) {
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Label fallthrough;
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__ cmp(edi, Operand(backtrack_stackpointer(), 0));
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__ j(not_equal, &fallthrough);
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__ add(backtrack_stackpointer(), Immediate(kPointerSize)); // Pop.
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BranchOrBacktrack(no_condition, on_equal);
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__ bind(&fallthrough);
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}
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void RegExpMacroAssemblerIA32::CheckNotBackReferenceIgnoreCase(
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int start_reg,
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Label* on_no_match) {
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Label fallthrough;
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__ mov(edx, register_location(start_reg)); // Index of start of capture
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__ mov(ebx, register_location(start_reg + 1)); // Index of end of capture
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__ sub(ebx, edx); // Length of capture.
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// The length of a capture should not be negative. This can only happen
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// if the end of the capture is unrecorded, or at a point earlier than
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// the start of the capture.
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BranchOrBacktrack(less, on_no_match);
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// If length is zero, either the capture is empty or it is completely
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// uncaptured. In either case succeed immediately.
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__ j(equal, &fallthrough);
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if (mode_ == ASCII) {
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Label success;
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Label fail;
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Label loop_increment;
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// Save register contents to make the registers available below.
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__ push(edi);
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__ push(backtrack_stackpointer());
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// After this, the eax, ecx, and edi registers are available.
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__ add(edx, esi); // Start of capture
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__ add(edi, esi); // Start of text to match against capture.
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__ add(ebx, edi); // End of text to match against capture.
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Label loop;
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__ bind(&loop);
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__ movzx_b(eax, Operand(edi, 0));
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__ cmpb_al(Operand(edx, 0));
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__ j(equal, &loop_increment);
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// Mismatch, try case-insensitive match (converting letters to lower-case).
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__ or_(eax, 0x20); // Convert match character to lower-case.
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__ lea(ecx, Operand(eax, -'a'));
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__ cmp(ecx, static_cast<int32_t>('z' - 'a')); // Is eax a lowercase letter?
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__ j(above, &fail);
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// Also convert capture character.
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__ movzx_b(ecx, Operand(edx, 0));
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__ or_(ecx, 0x20);
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__ cmp(eax, ecx);
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__ j(not_equal, &fail);
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__ bind(&loop_increment);
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// Increment pointers into match and capture strings.
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__ add(edx, Immediate(1));
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__ add(edi, Immediate(1));
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// Compare to end of match, and loop if not done.
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__ cmp(edi, ebx);
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__ j(below, &loop);
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__ jmp(&success);
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__ bind(&fail);
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// Restore original values before failing.
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__ pop(backtrack_stackpointer());
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__ pop(edi);
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BranchOrBacktrack(no_condition, on_no_match);
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__ bind(&success);
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// Restore original value before continuing.
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__ pop(backtrack_stackpointer());
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// Drop original value of character position.
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__ add(esp, Immediate(kPointerSize));
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// Compute new value of character position after the matched part.
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__ sub(edi, esi);
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} else {
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ASSERT(mode_ == UC16);
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// Save registers before calling C function.
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__ push(esi);
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__ push(edi);
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__ push(backtrack_stackpointer());
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__ push(ebx);
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static const int argument_count = 4;
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__ PrepareCallCFunction(argument_count, ecx);
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// Put arguments into allocated stack area, last argument highest on stack.
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// Parameters are
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// Address byte_offset1 - Address captured substring's start.
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// Address byte_offset2 - Address of current character position.
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// size_t byte_length - length of capture in bytes(!)
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// Isolate* isolate
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// Set isolate.
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__ mov(Operand(esp, 3 * kPointerSize),
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Immediate(ExternalReference::isolate_address()));
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// Set byte_length.
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__ mov(Operand(esp, 2 * kPointerSize), ebx);
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// Set byte_offset2.
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// Found by adding negative string-end offset of current position (edi)
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// to end of string.
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__ add(edi, esi);
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__ mov(Operand(esp, 1 * kPointerSize), edi);
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// Set byte_offset1.
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// Start of capture, where edx already holds string-end negative offset.
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__ add(edx, esi);
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__ mov(Operand(esp, 0 * kPointerSize), edx);
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{
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AllowExternalCallThatCantCauseGC scope(masm_);
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ExternalReference compare =
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ExternalReference::re_case_insensitive_compare_uc16(masm_->isolate());
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__ CallCFunction(compare, argument_count);
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}
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// Pop original values before reacting on result value.
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__ pop(ebx);
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__ pop(backtrack_stackpointer());
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__ pop(edi);
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__ pop(esi);
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// Check if function returned non-zero for success or zero for failure.
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__ or_(eax, eax);
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BranchOrBacktrack(zero, on_no_match);
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// On success, increment position by length of capture.
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__ add(edi, ebx);
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}
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__ bind(&fallthrough);
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}
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void RegExpMacroAssemblerIA32::CheckNotBackReference(
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int start_reg,
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Label* on_no_match) {
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Label fallthrough;
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Label success;
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Label fail;
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|
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// Find length of back-referenced capture.
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__ mov(edx, register_location(start_reg));
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__ mov(eax, register_location(start_reg + 1));
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__ sub(eax, edx); // Length to check.
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// Fail on partial or illegal capture (start of capture after end of capture).
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BranchOrBacktrack(less, on_no_match);
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// Succeed on empty capture (including no capture)
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__ j(equal, &fallthrough);
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// Check that there are sufficient characters left in the input.
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|
__ mov(ebx, edi);
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__ add(ebx, eax);
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BranchOrBacktrack(greater, on_no_match);
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// Save register to make it available below.
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__ push(backtrack_stackpointer());
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// Compute pointers to match string and capture string
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__ lea(ebx, Operand(esi, edi, times_1, 0)); // Start of match.
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__ add(edx, esi); // Start of capture.
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__ lea(ecx, Operand(eax, ebx, times_1, 0)); // End of match
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Label loop;
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__ bind(&loop);
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if (mode_ == ASCII) {
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__ movzx_b(eax, Operand(edx, 0));
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__ cmpb_al(Operand(ebx, 0));
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} else {
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ASSERT(mode_ == UC16);
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__ movzx_w(eax, Operand(edx, 0));
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__ cmpw_ax(Operand(ebx, 0));
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}
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__ j(not_equal, &fail);
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|
// Increment pointers into capture and match string.
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|
__ add(edx, Immediate(char_size()));
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__ add(ebx, Immediate(char_size()));
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// Check if we have reached end of match area.
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__ cmp(ebx, ecx);
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__ j(below, &loop);
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__ jmp(&success);
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|
|
__ bind(&fail);
|
|
// Restore backtrack stackpointer.
|
|
__ pop(backtrack_stackpointer());
|
|
BranchOrBacktrack(no_condition, on_no_match);
|
|
|
|
__ bind(&success);
|
|
// Move current character position to position after match.
|
|
__ mov(edi, ecx);
|
|
__ sub(edi, esi);
|
|
// Restore backtrack stackpointer.
|
|
__ pop(backtrack_stackpointer());
|
|
|
|
__ bind(&fallthrough);
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::CheckNotRegistersEqual(int reg1,
|
|
int reg2,
|
|
Label* on_not_equal) {
|
|
__ mov(eax, register_location(reg1));
|
|
__ cmp(eax, register_location(reg2));
|
|
BranchOrBacktrack(not_equal, on_not_equal);
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::CheckNotCharacter(uint32_t c,
|
|
Label* on_not_equal) {
|
|
__ cmp(current_character(), c);
|
|
BranchOrBacktrack(not_equal, on_not_equal);
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::CheckCharacterAfterAnd(uint32_t c,
|
|
uint32_t mask,
|
|
Label* on_equal) {
|
|
__ mov(eax, current_character());
|
|
__ and_(eax, mask);
|
|
__ cmp(eax, c);
|
|
BranchOrBacktrack(equal, on_equal);
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::CheckNotCharacterAfterAnd(uint32_t c,
|
|
uint32_t mask,
|
|
Label* on_not_equal) {
|
|
__ mov(eax, current_character());
|
|
__ and_(eax, mask);
|
|
__ cmp(eax, c);
|
|
BranchOrBacktrack(not_equal, on_not_equal);
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::CheckNotCharacterAfterMinusAnd(
|
|
uc16 c,
|
|
uc16 minus,
|
|
uc16 mask,
|
|
Label* on_not_equal) {
|
|
ASSERT(minus < String::kMaxUC16CharCode);
|
|
__ lea(eax, Operand(current_character(), -minus));
|
|
__ and_(eax, mask);
|
|
__ cmp(eax, c);
|
|
BranchOrBacktrack(not_equal, on_not_equal);
|
|
}
|
|
|
|
|
|
bool RegExpMacroAssemblerIA32::CheckSpecialCharacterClass(uc16 type,
|
|
Label* on_no_match) {
|
|
// Range checks (c in min..max) are generally implemented by an unsigned
|
|
// (c - min) <= (max - min) check
|
|
switch (type) {
|
|
case 's':
|
|
// Match space-characters
|
|
if (mode_ == ASCII) {
|
|
// ASCII space characters are '\t'..'\r' and ' '.
|
|
Label success;
|
|
__ cmp(current_character(), ' ');
|
|
__ j(equal, &success);
|
|
// Check range 0x09..0x0d
|
|
__ lea(eax, Operand(current_character(), -'\t'));
|
|
__ cmp(eax, '\r' - '\t');
|
|
BranchOrBacktrack(above, on_no_match);
|
|
__ bind(&success);
|
|
return true;
|
|
}
|
|
return false;
|
|
case 'S':
|
|
// Match non-space characters.
|
|
if (mode_ == ASCII) {
|
|
// ASCII space characters are '\t'..'\r' and ' '.
|
|
__ cmp(current_character(), ' ');
|
|
BranchOrBacktrack(equal, on_no_match);
|
|
__ lea(eax, Operand(current_character(), -'\t'));
|
|
__ cmp(eax, '\r' - '\t');
|
|
BranchOrBacktrack(below_equal, on_no_match);
|
|
return true;
|
|
}
|
|
return false;
|
|
case 'd':
|
|
// Match ASCII digits ('0'..'9')
|
|
__ lea(eax, Operand(current_character(), -'0'));
|
|
__ cmp(eax, '9' - '0');
|
|
BranchOrBacktrack(above, on_no_match);
|
|
return true;
|
|
case 'D':
|
|
// Match non ASCII-digits
|
|
__ lea(eax, Operand(current_character(), -'0'));
|
|
__ cmp(eax, '9' - '0');
|
|
BranchOrBacktrack(below_equal, on_no_match);
|
|
return true;
|
|
case '.': {
|
|
// Match non-newlines (not 0x0a('\n'), 0x0d('\r'), 0x2028 and 0x2029)
|
|
__ mov(eax, current_character());
|
|
__ xor_(eax, Immediate(0x01));
|
|
// See if current character is '\n'^1 or '\r'^1, i.e., 0x0b or 0x0c
|
|
__ sub(eax, Immediate(0x0b));
|
|
__ cmp(eax, 0x0c - 0x0b);
|
|
BranchOrBacktrack(below_equal, on_no_match);
|
|
if (mode_ == UC16) {
|
|
// Compare original value to 0x2028 and 0x2029, using the already
|
|
// computed (current_char ^ 0x01 - 0x0b). I.e., check for
|
|
// 0x201d (0x2028 - 0x0b) or 0x201e.
|
|
__ sub(eax, Immediate(0x2028 - 0x0b));
|
|
__ cmp(eax, 0x2029 - 0x2028);
|
|
BranchOrBacktrack(below_equal, on_no_match);
|
|
}
|
|
return true;
|
|
}
|
|
case 'w': {
|
|
if (mode_ != ASCII) {
|
|
// Table is 128 entries, so all ASCII characters can be tested.
|
|
__ cmp(current_character(), Immediate('z'));
|
|
BranchOrBacktrack(above, on_no_match);
|
|
}
|
|
ASSERT_EQ(0, word_character_map[0]); // Character '\0' is not a word char.
|
|
ExternalReference word_map = ExternalReference::re_word_character_map();
|
|
__ test_b(current_character(),
|
|
Operand::StaticArray(current_character(), times_1, word_map));
|
|
BranchOrBacktrack(zero, on_no_match);
|
|
return true;
|
|
}
|
|
case 'W': {
|
|
Label done;
|
|
if (mode_ != ASCII) {
|
|
// Table is 128 entries, so all ASCII characters can be tested.
|
|
__ cmp(current_character(), Immediate('z'));
|
|
__ j(above, &done);
|
|
}
|
|
ASSERT_EQ(0, word_character_map[0]); // Character '\0' is not a word char.
|
|
ExternalReference word_map = ExternalReference::re_word_character_map();
|
|
__ test_b(current_character(),
|
|
Operand::StaticArray(current_character(), times_1, word_map));
|
|
BranchOrBacktrack(not_zero, on_no_match);
|
|
if (mode_ != ASCII) {
|
|
__ bind(&done);
|
|
}
|
|
return true;
|
|
}
|
|
// Non-standard classes (with no syntactic shorthand) used internally.
|
|
case '*':
|
|
// Match any character.
|
|
return true;
|
|
case 'n': {
|
|
// Match newlines (0x0a('\n'), 0x0d('\r'), 0x2028 or 0x2029).
|
|
// The opposite of '.'.
|
|
__ mov(eax, current_character());
|
|
__ xor_(eax, Immediate(0x01));
|
|
// See if current character is '\n'^1 or '\r'^1, i.e., 0x0b or 0x0c
|
|
__ sub(eax, Immediate(0x0b));
|
|
__ cmp(eax, 0x0c - 0x0b);
|
|
if (mode_ == ASCII) {
|
|
BranchOrBacktrack(above, on_no_match);
|
|
} else {
|
|
Label done;
|
|
BranchOrBacktrack(below_equal, &done);
|
|
ASSERT_EQ(UC16, mode_);
|
|
// Compare original value to 0x2028 and 0x2029, using the already
|
|
// computed (current_char ^ 0x01 - 0x0b). I.e., check for
|
|
// 0x201d (0x2028 - 0x0b) or 0x201e.
|
|
__ sub(eax, Immediate(0x2028 - 0x0b));
|
|
__ cmp(eax, 1);
|
|
BranchOrBacktrack(above, on_no_match);
|
|
__ bind(&done);
|
|
}
|
|
return true;
|
|
}
|
|
// No custom implementation (yet): s(UC16), S(UC16).
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::Fail() {
|
|
ASSERT(FAILURE == 0); // Return value for failure is zero.
|
|
__ Set(eax, Immediate(0));
|
|
__ jmp(&exit_label_);
|
|
}
|
|
|
|
|
|
Handle<HeapObject> RegExpMacroAssemblerIA32::GetCode(Handle<String> source) {
|
|
// Finalize code - write the entry point code now we know how many
|
|
// registers we need.
|
|
|
|
// Entry code:
|
|
__ bind(&entry_label_);
|
|
|
|
// Tell the system that we have a stack frame. Because the type is MANUAL, no
|
|
// code is generated.
|
|
FrameScope scope(masm_, StackFrame::MANUAL);
|
|
|
|
// Actually emit code to start a new stack frame.
|
|
__ push(ebp);
|
|
__ mov(ebp, esp);
|
|
// Save callee-save registers. Order here should correspond to order of
|
|
// kBackup_ebx etc.
|
|
__ push(esi);
|
|
__ push(edi);
|
|
__ push(ebx); // Callee-save on MacOS.
|
|
__ push(Immediate(0)); // Make room for "input start - 1" constant.
|
|
|
|
// Check if we have space on the stack for registers.
|
|
Label stack_limit_hit;
|
|
Label stack_ok;
|
|
|
|
ExternalReference stack_limit =
|
|
ExternalReference::address_of_stack_limit(masm_->isolate());
|
|
__ mov(ecx, esp);
|
|
__ sub(ecx, Operand::StaticVariable(stack_limit));
|
|
// Handle it if the stack pointer is already below the stack limit.
|
|
__ j(below_equal, &stack_limit_hit);
|
|
// Check if there is room for the variable number of registers above
|
|
// the stack limit.
|
|
__ cmp(ecx, num_registers_ * kPointerSize);
|
|
__ j(above_equal, &stack_ok);
|
|
// Exit with OutOfMemory exception. There is not enough space on the stack
|
|
// for our working registers.
|
|
__ mov(eax, EXCEPTION);
|
|
__ jmp(&exit_label_);
|
|
|
|
__ bind(&stack_limit_hit);
|
|
CallCheckStackGuardState(ebx);
|
|
__ or_(eax, eax);
|
|
// If returned value is non-zero, we exit with the returned value as result.
|
|
__ j(not_zero, &exit_label_);
|
|
|
|
__ bind(&stack_ok);
|
|
// Load start index for later use.
|
|
__ mov(ebx, Operand(ebp, kStartIndex));
|
|
|
|
// Allocate space on stack for registers.
|
|
__ sub(esp, Immediate(num_registers_ * kPointerSize));
|
|
// Load string length.
|
|
__ mov(esi, Operand(ebp, kInputEnd));
|
|
// Load input position.
|
|
__ mov(edi, Operand(ebp, kInputStart));
|
|
// Set up edi to be negative offset from string end.
|
|
__ sub(edi, esi);
|
|
|
|
// Set eax to address of char before start of the string.
|
|
// (effectively string position -1).
|
|
__ neg(ebx);
|
|
if (mode_ == UC16) {
|
|
__ lea(eax, Operand(edi, ebx, times_2, -char_size()));
|
|
} else {
|
|
__ lea(eax, Operand(edi, ebx, times_1, -char_size()));
|
|
}
|
|
// Store this value in a local variable, for use when clearing
|
|
// position registers.
|
|
__ mov(Operand(ebp, kInputStartMinusOne), eax);
|
|
|
|
if (num_saved_registers_ > 0) { // Always is, if generated from a regexp.
|
|
// Fill saved registers with initial value = start offset - 1
|
|
// Fill in stack push order, to avoid accessing across an unwritten
|
|
// page (a problem on Windows).
|
|
__ mov(ecx, kRegisterZero);
|
|
Label init_loop;
|
|
__ bind(&init_loop);
|
|
__ mov(Operand(ebp, ecx, times_1, +0), eax);
|
|
__ sub(ecx, Immediate(kPointerSize));
|
|
__ cmp(ecx, kRegisterZero - num_saved_registers_ * kPointerSize);
|
|
__ j(greater, &init_loop);
|
|
}
|
|
// Ensure that we have written to each stack page, in order. Skipping a page
|
|
// on Windows can cause segmentation faults. Assuming page size is 4k.
|
|
const int kPageSize = 4096;
|
|
const int kRegistersPerPage = kPageSize / kPointerSize;
|
|
for (int i = num_saved_registers_ + kRegistersPerPage - 1;
|
|
i < num_registers_;
|
|
i += kRegistersPerPage) {
|
|
__ mov(register_location(i), eax); // One write every page.
|
|
}
|
|
|
|
|
|
// Initialize backtrack stack pointer.
|
|
__ mov(backtrack_stackpointer(), Operand(ebp, kStackHighEnd));
|
|
// Load previous char as initial value of current-character.
|
|
Label at_start;
|
|
__ cmp(Operand(ebp, kStartIndex), Immediate(0));
|
|
__ j(equal, &at_start);
|
|
LoadCurrentCharacterUnchecked(-1, 1); // Load previous char.
|
|
__ jmp(&start_label_);
|
|
__ bind(&at_start);
|
|
__ mov(current_character(), '\n');
|
|
__ jmp(&start_label_);
|
|
|
|
|
|
// Exit code:
|
|
if (success_label_.is_linked()) {
|
|
// Save captures when successful.
|
|
__ bind(&success_label_);
|
|
if (num_saved_registers_ > 0) {
|
|
// copy captures to output
|
|
__ mov(ebx, Operand(ebp, kRegisterOutput));
|
|
__ mov(ecx, Operand(ebp, kInputEnd));
|
|
__ mov(edx, Operand(ebp, kStartIndex));
|
|
__ sub(ecx, Operand(ebp, kInputStart));
|
|
if (mode_ == UC16) {
|
|
__ lea(ecx, Operand(ecx, edx, times_2, 0));
|
|
} else {
|
|
__ add(ecx, edx);
|
|
}
|
|
for (int i = 0; i < num_saved_registers_; i++) {
|
|
__ mov(eax, register_location(i));
|
|
// Convert to index from start of string, not end.
|
|
__ add(eax, ecx);
|
|
if (mode_ == UC16) {
|
|
__ sar(eax, 1); // Convert byte index to character index.
|
|
}
|
|
__ mov(Operand(ebx, i * kPointerSize), eax);
|
|
}
|
|
}
|
|
__ mov(eax, Immediate(SUCCESS));
|
|
}
|
|
// Exit and return eax
|
|
__ bind(&exit_label_);
|
|
// Skip esp past regexp registers.
|
|
__ lea(esp, Operand(ebp, kBackup_ebx));
|
|
// Restore callee-save registers.
|
|
__ pop(ebx);
|
|
__ pop(edi);
|
|
__ pop(esi);
|
|
// Exit function frame, restore previous one.
|
|
__ pop(ebp);
|
|
__ ret(0);
|
|
|
|
// Backtrack code (branch target for conditional backtracks).
|
|
if (backtrack_label_.is_linked()) {
|
|
__ bind(&backtrack_label_);
|
|
Backtrack();
|
|
}
|
|
|
|
Label exit_with_exception;
|
|
|
|
// Preempt-code
|
|
if (check_preempt_label_.is_linked()) {
|
|
SafeCallTarget(&check_preempt_label_);
|
|
|
|
__ push(backtrack_stackpointer());
|
|
__ push(edi);
|
|
|
|
CallCheckStackGuardState(ebx);
|
|
__ or_(eax, eax);
|
|
// If returning non-zero, we should end execution with the given
|
|
// result as return value.
|
|
__ j(not_zero, &exit_label_);
|
|
|
|
__ pop(edi);
|
|
__ pop(backtrack_stackpointer());
|
|
// String might have moved: Reload esi from frame.
|
|
__ mov(esi, Operand(ebp, kInputEnd));
|
|
SafeReturn();
|
|
}
|
|
|
|
// Backtrack stack overflow code.
|
|
if (stack_overflow_label_.is_linked()) {
|
|
SafeCallTarget(&stack_overflow_label_);
|
|
// Reached if the backtrack-stack limit has been hit.
|
|
|
|
Label grow_failed;
|
|
// Save registers before calling C function
|
|
__ push(esi);
|
|
__ push(edi);
|
|
|
|
// Call GrowStack(backtrack_stackpointer())
|
|
static const int num_arguments = 3;
|
|
__ PrepareCallCFunction(num_arguments, ebx);
|
|
__ mov(Operand(esp, 2 * kPointerSize),
|
|
Immediate(ExternalReference::isolate_address()));
|
|
__ lea(eax, Operand(ebp, kStackHighEnd));
|
|
__ mov(Operand(esp, 1 * kPointerSize), eax);
|
|
__ mov(Operand(esp, 0 * kPointerSize), backtrack_stackpointer());
|
|
ExternalReference grow_stack =
|
|
ExternalReference::re_grow_stack(masm_->isolate());
|
|
__ CallCFunction(grow_stack, num_arguments);
|
|
// If return NULL, we have failed to grow the stack, and
|
|
// must exit with a stack-overflow exception.
|
|
__ or_(eax, eax);
|
|
__ j(equal, &exit_with_exception);
|
|
// Otherwise use return value as new stack pointer.
|
|
__ mov(backtrack_stackpointer(), eax);
|
|
// Restore saved registers and continue.
|
|
__ pop(edi);
|
|
__ pop(esi);
|
|
SafeReturn();
|
|
}
|
|
|
|
if (exit_with_exception.is_linked()) {
|
|
// If any of the code above needed to exit with an exception.
|
|
__ bind(&exit_with_exception);
|
|
// Exit with Result EXCEPTION(-1) to signal thrown exception.
|
|
__ mov(eax, EXCEPTION);
|
|
__ jmp(&exit_label_);
|
|
}
|
|
|
|
CodeDesc code_desc;
|
|
masm_->GetCode(&code_desc);
|
|
Handle<Code> code =
|
|
masm_->isolate()->factory()->NewCode(code_desc,
|
|
Code::ComputeFlags(Code::REGEXP),
|
|
masm_->CodeObject());
|
|
PROFILE(masm_->isolate(), RegExpCodeCreateEvent(*code, *source));
|
|
return Handle<HeapObject>::cast(code);
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::GoTo(Label* to) {
|
|
BranchOrBacktrack(no_condition, to);
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::IfRegisterGE(int reg,
|
|
int comparand,
|
|
Label* if_ge) {
|
|
__ cmp(register_location(reg), Immediate(comparand));
|
|
BranchOrBacktrack(greater_equal, if_ge);
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::IfRegisterLT(int reg,
|
|
int comparand,
|
|
Label* if_lt) {
|
|
__ cmp(register_location(reg), Immediate(comparand));
|
|
BranchOrBacktrack(less, if_lt);
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::IfRegisterEqPos(int reg,
|
|
Label* if_eq) {
|
|
__ cmp(edi, register_location(reg));
|
|
BranchOrBacktrack(equal, if_eq);
|
|
}
|
|
|
|
|
|
RegExpMacroAssembler::IrregexpImplementation
|
|
RegExpMacroAssemblerIA32::Implementation() {
|
|
return kIA32Implementation;
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::LoadCurrentCharacter(int cp_offset,
|
|
Label* on_end_of_input,
|
|
bool check_bounds,
|
|
int characters) {
|
|
ASSERT(cp_offset >= -1); // ^ and \b can look behind one character.
|
|
ASSERT(cp_offset < (1<<30)); // Be sane! (And ensure negation works)
|
|
if (check_bounds) {
|
|
CheckPosition(cp_offset + characters - 1, on_end_of_input);
|
|
}
|
|
LoadCurrentCharacterUnchecked(cp_offset, characters);
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::PopCurrentPosition() {
|
|
Pop(edi);
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::PopRegister(int register_index) {
|
|
Pop(eax);
|
|
__ mov(register_location(register_index), eax);
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::PushBacktrack(Label* label) {
|
|
Push(Immediate::CodeRelativeOffset(label));
|
|
CheckStackLimit();
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::PushCurrentPosition() {
|
|
Push(edi);
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::PushRegister(int register_index,
|
|
StackCheckFlag check_stack_limit) {
|
|
__ mov(eax, register_location(register_index));
|
|
Push(eax);
|
|
if (check_stack_limit) CheckStackLimit();
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::ReadCurrentPositionFromRegister(int reg) {
|
|
__ mov(edi, register_location(reg));
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::ReadStackPointerFromRegister(int reg) {
|
|
__ mov(backtrack_stackpointer(), register_location(reg));
|
|
__ add(backtrack_stackpointer(), Operand(ebp, kStackHighEnd));
|
|
}
|
|
|
|
void RegExpMacroAssemblerIA32::SetCurrentPositionFromEnd(int by) {
|
|
Label after_position;
|
|
__ cmp(edi, -by * char_size());
|
|
__ j(greater_equal, &after_position, Label::kNear);
|
|
__ mov(edi, -by * char_size());
|
|
// On RegExp code entry (where this operation is used), the character before
|
|
// the current position is expected to be already loaded.
|
|
// We have advanced the position, so it's safe to read backwards.
|
|
LoadCurrentCharacterUnchecked(-1, 1);
|
|
__ bind(&after_position);
|
|
}
|
|
|
|
void RegExpMacroAssemblerIA32::SetRegister(int register_index, int to) {
|
|
ASSERT(register_index >= num_saved_registers_); // Reserved for positions!
|
|
__ mov(register_location(register_index), Immediate(to));
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::Succeed() {
|
|
__ jmp(&success_label_);
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::WriteCurrentPositionToRegister(int reg,
|
|
int cp_offset) {
|
|
if (cp_offset == 0) {
|
|
__ mov(register_location(reg), edi);
|
|
} else {
|
|
__ lea(eax, Operand(edi, cp_offset * char_size()));
|
|
__ mov(register_location(reg), eax);
|
|
}
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::ClearRegisters(int reg_from, int reg_to) {
|
|
ASSERT(reg_from <= reg_to);
|
|
__ mov(eax, Operand(ebp, kInputStartMinusOne));
|
|
for (int reg = reg_from; reg <= reg_to; reg++) {
|
|
__ mov(register_location(reg), eax);
|
|
}
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::WriteStackPointerToRegister(int reg) {
|
|
__ mov(eax, backtrack_stackpointer());
|
|
__ sub(eax, Operand(ebp, kStackHighEnd));
|
|
__ mov(register_location(reg), eax);
|
|
}
|
|
|
|
|
|
// Private methods:
|
|
|
|
void RegExpMacroAssemblerIA32::CallCheckStackGuardState(Register scratch) {
|
|
static const int num_arguments = 3;
|
|
__ PrepareCallCFunction(num_arguments, scratch);
|
|
// RegExp code frame pointer.
|
|
__ mov(Operand(esp, 2 * kPointerSize), ebp);
|
|
// Code* of self.
|
|
__ mov(Operand(esp, 1 * kPointerSize), Immediate(masm_->CodeObject()));
|
|
// Next address on the stack (will be address of return address).
|
|
__ lea(eax, Operand(esp, -kPointerSize));
|
|
__ mov(Operand(esp, 0 * kPointerSize), eax);
|
|
ExternalReference check_stack_guard =
|
|
ExternalReference::re_check_stack_guard_state(masm_->isolate());
|
|
__ CallCFunction(check_stack_guard, num_arguments);
|
|
}
|
|
|
|
|
|
// Helper function for reading a value out of a stack frame.
|
|
template <typename T>
|
|
static T& frame_entry(Address re_frame, int frame_offset) {
|
|
return reinterpret_cast<T&>(Memory::int32_at(re_frame + frame_offset));
|
|
}
|
|
|
|
|
|
int RegExpMacroAssemblerIA32::CheckStackGuardState(Address* return_address,
|
|
Code* re_code,
|
|
Address re_frame) {
|
|
Isolate* isolate = frame_entry<Isolate*>(re_frame, kIsolate);
|
|
ASSERT(isolate == Isolate::Current());
|
|
if (isolate->stack_guard()->IsStackOverflow()) {
|
|
isolate->StackOverflow();
|
|
return EXCEPTION;
|
|
}
|
|
|
|
// If not real stack overflow the stack guard was used to interrupt
|
|
// execution for another purpose.
|
|
|
|
// If this is a direct call from JavaScript retry the RegExp forcing the call
|
|
// through the runtime system. Currently the direct call cannot handle a GC.
|
|
if (frame_entry<int>(re_frame, kDirectCall) == 1) {
|
|
return RETRY;
|
|
}
|
|
|
|
// Prepare for possible GC.
|
|
HandleScope handles(isolate);
|
|
Handle<Code> code_handle(re_code);
|
|
|
|
Handle<String> subject(frame_entry<String*>(re_frame, kInputString));
|
|
|
|
// Current string.
|
|
bool is_ascii = subject->IsAsciiRepresentationUnderneath();
|
|
|
|
ASSERT(re_code->instruction_start() <= *return_address);
|
|
ASSERT(*return_address <=
|
|
re_code->instruction_start() + re_code->instruction_size());
|
|
|
|
MaybeObject* result = Execution::HandleStackGuardInterrupt();
|
|
|
|
if (*code_handle != re_code) { // Return address no longer valid
|
|
int delta = code_handle->address() - re_code->address();
|
|
// Overwrite the return address on the stack.
|
|
*return_address += delta;
|
|
}
|
|
|
|
if (result->IsException()) {
|
|
return EXCEPTION;
|
|
}
|
|
|
|
Handle<String> subject_tmp = subject;
|
|
int slice_offset = 0;
|
|
|
|
// Extract the underlying string and the slice offset.
|
|
if (StringShape(*subject_tmp).IsCons()) {
|
|
subject_tmp = Handle<String>(ConsString::cast(*subject_tmp)->first());
|
|
} else if (StringShape(*subject_tmp).IsSliced()) {
|
|
SlicedString* slice = SlicedString::cast(*subject_tmp);
|
|
subject_tmp = Handle<String>(slice->parent());
|
|
slice_offset = slice->offset();
|
|
}
|
|
|
|
// String might have changed.
|
|
if (subject_tmp->IsAsciiRepresentation() != is_ascii) {
|
|
// If we changed between an ASCII and an UC16 string, the specialized
|
|
// code cannot be used, and we need to restart regexp matching from
|
|
// scratch (including, potentially, compiling a new version of the code).
|
|
return RETRY;
|
|
}
|
|
|
|
// Otherwise, the content of the string might have moved. It must still
|
|
// be a sequential or external string with the same content.
|
|
// Update the start and end pointers in the stack frame to the current
|
|
// location (whether it has actually moved or not).
|
|
ASSERT(StringShape(*subject_tmp).IsSequential() ||
|
|
StringShape(*subject_tmp).IsExternal());
|
|
|
|
// The original start address of the characters to match.
|
|
const byte* start_address = frame_entry<const byte*>(re_frame, kInputStart);
|
|
|
|
// Find the current start address of the same character at the current string
|
|
// position.
|
|
int start_index = frame_entry<int>(re_frame, kStartIndex);
|
|
const byte* new_address = StringCharacterPosition(*subject_tmp,
|
|
start_index + slice_offset);
|
|
|
|
if (start_address != new_address) {
|
|
// If there is a difference, update the object pointer and start and end
|
|
// addresses in the RegExp stack frame to match the new value.
|
|
const byte* end_address = frame_entry<const byte* >(re_frame, kInputEnd);
|
|
int byte_length = static_cast<int>(end_address - start_address);
|
|
frame_entry<const String*>(re_frame, kInputString) = *subject;
|
|
frame_entry<const byte*>(re_frame, kInputStart) = new_address;
|
|
frame_entry<const byte*>(re_frame, kInputEnd) = new_address + byte_length;
|
|
} else if (frame_entry<const String*>(re_frame, kInputString) != *subject) {
|
|
// Subject string might have been a ConsString that underwent
|
|
// short-circuiting during GC. That will not change start_address but
|
|
// will change pointer inside the subject handle.
|
|
frame_entry<const String*>(re_frame, kInputString) = *subject;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
Operand RegExpMacroAssemblerIA32::register_location(int register_index) {
|
|
ASSERT(register_index < (1<<30));
|
|
if (num_registers_ <= register_index) {
|
|
num_registers_ = register_index + 1;
|
|
}
|
|
return Operand(ebp, kRegisterZero - register_index * kPointerSize);
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::CheckPosition(int cp_offset,
|
|
Label* on_outside_input) {
|
|
__ cmp(edi, -cp_offset * char_size());
|
|
BranchOrBacktrack(greater_equal, on_outside_input);
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::BranchOrBacktrack(Condition condition,
|
|
Label* to) {
|
|
if (condition < 0) { // No condition
|
|
if (to == NULL) {
|
|
Backtrack();
|
|
return;
|
|
}
|
|
__ jmp(to);
|
|
return;
|
|
}
|
|
if (to == NULL) {
|
|
__ j(condition, &backtrack_label_);
|
|
return;
|
|
}
|
|
__ j(condition, to);
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::SafeCall(Label* to) {
|
|
Label return_to;
|
|
__ push(Immediate::CodeRelativeOffset(&return_to));
|
|
__ jmp(to);
|
|
__ bind(&return_to);
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::SafeReturn() {
|
|
__ pop(ebx);
|
|
__ add(ebx, Immediate(masm_->CodeObject()));
|
|
__ jmp(ebx);
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::SafeCallTarget(Label* name) {
|
|
__ bind(name);
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::Push(Register source) {
|
|
ASSERT(!source.is(backtrack_stackpointer()));
|
|
// Notice: This updates flags, unlike normal Push.
|
|
__ sub(backtrack_stackpointer(), Immediate(kPointerSize));
|
|
__ mov(Operand(backtrack_stackpointer(), 0), source);
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::Push(Immediate value) {
|
|
// Notice: This updates flags, unlike normal Push.
|
|
__ sub(backtrack_stackpointer(), Immediate(kPointerSize));
|
|
__ mov(Operand(backtrack_stackpointer(), 0), value);
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::Pop(Register target) {
|
|
ASSERT(!target.is(backtrack_stackpointer()));
|
|
__ mov(target, Operand(backtrack_stackpointer(), 0));
|
|
// Notice: This updates flags, unlike normal Pop.
|
|
__ add(backtrack_stackpointer(), Immediate(kPointerSize));
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::CheckPreemption() {
|
|
// Check for preemption.
|
|
Label no_preempt;
|
|
ExternalReference stack_limit =
|
|
ExternalReference::address_of_stack_limit(masm_->isolate());
|
|
__ cmp(esp, Operand::StaticVariable(stack_limit));
|
|
__ j(above, &no_preempt);
|
|
|
|
SafeCall(&check_preempt_label_);
|
|
|
|
__ bind(&no_preempt);
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::CheckStackLimit() {
|
|
Label no_stack_overflow;
|
|
ExternalReference stack_limit =
|
|
ExternalReference::address_of_regexp_stack_limit(masm_->isolate());
|
|
__ cmp(backtrack_stackpointer(), Operand::StaticVariable(stack_limit));
|
|
__ j(above, &no_stack_overflow);
|
|
|
|
SafeCall(&stack_overflow_label_);
|
|
|
|
__ bind(&no_stack_overflow);
|
|
}
|
|
|
|
|
|
void RegExpMacroAssemblerIA32::LoadCurrentCharacterUnchecked(int cp_offset,
|
|
int characters) {
|
|
if (mode_ == ASCII) {
|
|
if (characters == 4) {
|
|
__ mov(current_character(), Operand(esi, edi, times_1, cp_offset));
|
|
} else if (characters == 2) {
|
|
__ movzx_w(current_character(), Operand(esi, edi, times_1, cp_offset));
|
|
} else {
|
|
ASSERT(characters == 1);
|
|
__ movzx_b(current_character(), Operand(esi, edi, times_1, cp_offset));
|
|
}
|
|
} else {
|
|
ASSERT(mode_ == UC16);
|
|
if (characters == 2) {
|
|
__ mov(current_character(),
|
|
Operand(esi, edi, times_1, cp_offset * sizeof(uc16)));
|
|
} else {
|
|
ASSERT(characters == 1);
|
|
__ movzx_w(current_character(),
|
|
Operand(esi, edi, times_1, cp_offset * sizeof(uc16)));
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
#undef __
|
|
|
|
#endif // V8_INTERPRETED_REGEXP
|
|
|
|
}} // namespace v8::internal
|
|
|
|
#endif // V8_TARGET_ARCH_IA32
|