1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
// Copyright 2012 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_HEAP_MARK_COMPACT_INL_H_
#define V8_HEAP_MARK_COMPACT_INL_H_
#include "src/heap/mark-compact.h"
#include "src/heap/slots-buffer.h"
#include "src/isolate.h"
namespace v8 {
namespace internal {
void MarkCompactCollector::PushBlack(HeapObject* obj) {
DCHECK(Marking::IsBlack(Marking::MarkBitFrom(obj)));
if (marking_deque_.Push(obj)) {
MemoryChunk::IncrementLiveBytesFromGC(obj, obj->Size());
} else {
Marking::BlackToGrey(obj);
}
}
void MarkCompactCollector::UnshiftBlack(HeapObject* obj) {
DCHECK(Marking::IsBlack(Marking::MarkBitFrom(obj)));
if (!marking_deque_.Unshift(obj)) {
MemoryChunk::IncrementLiveBytesFromGC(obj, -obj->Size());
Marking::BlackToGrey(obj);
}
}
void MarkCompactCollector::MarkObject(HeapObject* obj, MarkBit mark_bit) {
DCHECK(Marking::MarkBitFrom(obj) == mark_bit);
if (Marking::IsWhite(mark_bit)) {
Marking::WhiteToBlack(mark_bit);
DCHECK(obj->GetIsolate()->heap()->Contains(obj));
PushBlack(obj);
}
}
void MarkCompactCollector::SetMark(HeapObject* obj, MarkBit mark_bit) {
DCHECK(Marking::IsWhite(mark_bit));
DCHECK(Marking::MarkBitFrom(obj) == mark_bit);
Marking::WhiteToBlack(mark_bit);
MemoryChunk::IncrementLiveBytesFromGC(obj, obj->Size());
}
bool MarkCompactCollector::IsMarked(Object* obj) {
DCHECK(obj->IsHeapObject());
HeapObject* heap_object = HeapObject::cast(obj);
return Marking::IsBlackOrGrey(Marking::MarkBitFrom(heap_object));
}
void MarkCompactCollector::RecordSlot(HeapObject* object, Object** slot,
Object* target) {
Page* target_page = Page::FromAddress(reinterpret_cast<Address>(target));
if (target_page->IsEvacuationCandidate() &&
!ShouldSkipEvacuationSlotRecording(object)) {
if (!SlotsBuffer::AddTo(slots_buffer_allocator_,
target_page->slots_buffer_address(), slot,
SlotsBuffer::FAIL_ON_OVERFLOW)) {
EvictPopularEvacuationCandidate(target_page);
}
}
}
void MarkCompactCollector::ForceRecordSlot(HeapObject* object, Object** slot,
Object* target) {
Page* target_page = Page::FromAddress(reinterpret_cast<Address>(target));
if (target_page->IsEvacuationCandidate() &&
!ShouldSkipEvacuationSlotRecording(object)) {
CHECK(SlotsBuffer::AddTo(slots_buffer_allocator_,
target_page->slots_buffer_address(), slot,
SlotsBuffer::IGNORE_OVERFLOW));
}
}
void CodeFlusher::AddCandidate(SharedFunctionInfo* shared_info) {
if (GetNextCandidate(shared_info) == NULL) {
SetNextCandidate(shared_info, shared_function_info_candidates_head_);
shared_function_info_candidates_head_ = shared_info;
}
}
void CodeFlusher::AddCandidate(JSFunction* function) {
DCHECK(function->code() == function->shared()->code());
if (GetNextCandidate(function)->IsUndefined()) {
SetNextCandidate(function, jsfunction_candidates_head_);
jsfunction_candidates_head_ = function;
}
}
void CodeFlusher::AddOptimizedCodeMap(SharedFunctionInfo* code_map_holder) {
if (GetNextCodeMap(code_map_holder)->IsUndefined()) {
SetNextCodeMap(code_map_holder, optimized_code_map_holder_head_);
optimized_code_map_holder_head_ = code_map_holder;
}
}
JSFunction** CodeFlusher::GetNextCandidateSlot(JSFunction* candidate) {
return reinterpret_cast<JSFunction**>(
HeapObject::RawField(candidate, JSFunction::kNextFunctionLinkOffset));
}
JSFunction* CodeFlusher::GetNextCandidate(JSFunction* candidate) {
Object* next_candidate = candidate->next_function_link();
return reinterpret_cast<JSFunction*>(next_candidate);
}
void CodeFlusher::SetNextCandidate(JSFunction* candidate,
JSFunction* next_candidate) {
candidate->set_next_function_link(next_candidate, UPDATE_WEAK_WRITE_BARRIER);
}
void CodeFlusher::ClearNextCandidate(JSFunction* candidate, Object* undefined) {
DCHECK(undefined->IsUndefined());
candidate->set_next_function_link(undefined, SKIP_WRITE_BARRIER);
}
SharedFunctionInfo* CodeFlusher::GetNextCandidate(
SharedFunctionInfo* candidate) {
Object* next_candidate = candidate->code()->gc_metadata();
return reinterpret_cast<SharedFunctionInfo*>(next_candidate);
}
void CodeFlusher::SetNextCandidate(SharedFunctionInfo* candidate,
SharedFunctionInfo* next_candidate) {
candidate->code()->set_gc_metadata(next_candidate);
}
void CodeFlusher::ClearNextCandidate(SharedFunctionInfo* candidate) {
candidate->code()->set_gc_metadata(NULL, SKIP_WRITE_BARRIER);
}
SharedFunctionInfo* CodeFlusher::GetNextCodeMap(SharedFunctionInfo* holder) {
FixedArray* code_map = FixedArray::cast(holder->optimized_code_map());
Object* next_map = code_map->get(SharedFunctionInfo::kNextMapIndex);
return reinterpret_cast<SharedFunctionInfo*>(next_map);
}
void CodeFlusher::SetNextCodeMap(SharedFunctionInfo* holder,
SharedFunctionInfo* next_holder) {
FixedArray* code_map = FixedArray::cast(holder->optimized_code_map());
code_map->set(SharedFunctionInfo::kNextMapIndex, next_holder);
}
void CodeFlusher::ClearNextCodeMap(SharedFunctionInfo* holder) {
FixedArray* code_map = FixedArray::cast(holder->optimized_code_map());
code_map->set_undefined(SharedFunctionInfo::kNextMapIndex);
}
} // namespace internal
} // namespace v8
#endif // V8_HEAP_MARK_COMPACT_INL_H_
|
