Line data    Source code

       1             : // Copyright 2009 the V8 project authors. All rights reserved.
       2             : // Use of this source code is governed by a BSD-style license that can be
       3             : // found in the LICENSE file.
       4             : 
       5             : #include "src/regexp/regexp-stack.h"
       6             : 
       7             : #include "src/isolate.h"
       8             : 
       9             : namespace v8 {
      10             : namespace internal {
      11             : 
      12      598982 : RegExpStackScope::RegExpStackScope(Isolate* isolate)
      13      598982 :     : regexp_stack_(isolate->regexp_stack()) {
      14             :   // Initialize, if not already initialized.
      15      598982 :   regexp_stack_->EnsureCapacity(0);
      16      598982 : }
      17             : 
      18             : 
      19      598982 : RegExpStackScope::~RegExpStackScope() {
      20             :   // Reset the buffer if it has grown.
      21      598982 :   regexp_stack_->Reset();
      22      598982 : }
      23             : 
      24      109998 : RegExpStack::RegExpStack() : isolate_(nullptr) {}
      25             : 
      26       53365 : RegExpStack::~RegExpStack() {
      27       53365 :   thread_local_.Free();
      28       53365 : }
      29             : 
      30             : 
      31       24163 : char* RegExpStack::ArchiveStack(char* to) {
      32             :   size_t size = sizeof(thread_local_);
      33       24163 :   MemCopy(reinterpret_cast<void*>(to), &thread_local_, size);
      34       24163 :   thread_local_ = ThreadLocal();
      35       24163 :   return to + size;
      36             : }
      37             : 
      38             : 
      39       24163 : char* RegExpStack::RestoreStack(char* from) {
      40             :   size_t size = sizeof(thread_local_);
      41       24163 :   MemCopy(&thread_local_, reinterpret_cast<void*>(from), size);
      42       24163 :   return from + size;
      43             : }
      44             : 
      45             : 
      46      598982 : void RegExpStack::Reset() {
      47      598982 :   if (thread_local_.memory_size_ > kMinimumStackSize) {
      48         143 :     DeleteArray(thread_local_.memory_);
      49         143 :     thread_local_ = ThreadLocal();
      50             :   }
      51      598982 : }
      52             : 
      53             : 
      54       59221 : void RegExpStack::ThreadLocal::Free() {
      55       59221 :   if (memory_size_ > 0) {
      56        4678 :     DeleteArray(memory_);
      57             :     Clear();
      58             :   }
      59       59221 : }
      60             : 
      61             : 
      62      599425 : Address RegExpStack::EnsureCapacity(size_t size) {
      63      599425 :   if (size > kMaximumStackSize) return nullptr;
      64      599419 :   if (size < kMinimumStackSize) size = kMinimumStackSize;
      65      599419 :   if (thread_local_.memory_size_ < size) {
      66        6197 :     Address new_memory = NewArray<byte>(static_cast<int>(size));
      67        6197 :     if (thread_local_.memory_size_ > 0) {
      68             :       // Copy original memory into top of new memory.
      69         437 :       MemCopy(reinterpret_cast<void*>(new_memory + size -
      70         437 :                                       thread_local_.memory_size_),
      71             :               reinterpret_cast<void*>(thread_local_.memory_),
      72         437 :               thread_local_.memory_size_);
      73         437 :       DeleteArray(thread_local_.memory_);
      74             :     }
      75        6197 :     thread_local_.memory_ = new_memory;
      76        6197 :     thread_local_.memory_size_ = size;
      77        6197 :     thread_local_.limit_ = new_memory + kStackLimitSlack * kPointerSize;
      78             :   }
      79      599419 :   return thread_local_.memory_ + thread_local_.memory_size_;
      80             : }
      81             : 
      82             : 
      83             : }  // namespace internal
      84             : }  // namespace v8