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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/v8.h" | |
6 | |
7 #include "src/regexp-stack.h" | |
8 | |
9 namespace v8 { | |
10 namespace internal { | |
11 | |
12 RegExpStackScope::RegExpStackScope(Isolate* isolate) | |
13 : regexp_stack_(isolate->regexp_stack()) { | |
14 // Initialize, if not already initialized. | |
15 regexp_stack_->EnsureCapacity(0); | |
16 } | |
17 | |
18 | |
19 RegExpStackScope::~RegExpStackScope() { | |
20 // Reset the buffer if it has grown. | |
21 regexp_stack_->Reset(); | |
22 } | |
23 | |
24 | |
25 RegExpStack::RegExpStack() | |
26 : isolate_(NULL) { | |
27 } | |
28 | |
29 | |
30 RegExpStack::~RegExpStack() { | |
31 thread_local_.Free(); | |
32 } | |
33 | |
34 | |
35 char* RegExpStack::ArchiveStack(char* to) { | |
36 size_t size = sizeof(thread_local_); | |
37 MemCopy(reinterpret_cast<void*>(to), &thread_local_, size); | |
38 thread_local_ = ThreadLocal(); | |
39 return to + size; | |
40 } | |
41 | |
42 | |
43 char* RegExpStack::RestoreStack(char* from) { | |
44 size_t size = sizeof(thread_local_); | |
45 MemCopy(&thread_local_, reinterpret_cast<void*>(from), size); | |
46 return from + size; | |
47 } | |
48 | |
49 | |
50 void RegExpStack::Reset() { | |
51 if (thread_local_.memory_size_ > kMinimumStackSize) { | |
52 DeleteArray(thread_local_.memory_); | |
53 thread_local_ = ThreadLocal(); | |
54 } | |
55 } | |
56 | |
57 | |
58 void RegExpStack::ThreadLocal::Free() { | |
59 if (memory_size_ > 0) { | |
60 DeleteArray(memory_); | |
61 Clear(); | |
62 } | |
63 } | |
64 | |
65 | |
66 Address RegExpStack::EnsureCapacity(size_t size) { | |
67 if (size > kMaximumStackSize) return NULL; | |
68 if (size < kMinimumStackSize) size = kMinimumStackSize; | |
69 if (thread_local_.memory_size_ < size) { | |
70 Address new_memory = NewArray<byte>(static_cast<int>(size)); | |
71 if (thread_local_.memory_size_ > 0) { | |
72 // Copy original memory into top of new memory. | |
73 MemCopy(reinterpret_cast<void*>(new_memory + size - | |
74 thread_local_.memory_size_), | |
75 reinterpret_cast<void*>(thread_local_.memory_), | |
76 thread_local_.memory_size_); | |
77 DeleteArray(thread_local_.memory_); | |
78 } | |
79 thread_local_.memory_ = new_memory; | |
80 thread_local_.memory_size_ = size; | |
81 thread_local_.limit_ = new_memory + kStackLimitSlack * kPointerSize; | |
82 } | |
83 return thread_local_.memory_ + thread_local_.memory_size_; | |
84 } | |
85 | |
86 | |
87 } // namespace internal | |
88 } // namespace v8 | |
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