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
|
// Copyright 2020 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.
#include "src/heap/cppgc/heap-base.h"
#include "include/cppgc/heap-consistency.h"
#include "src/base/platform/platform.h"
#include "src/base/sanitizer/lsan-page-allocator.h"
#include "src/heap/base/stack.h"
#include "src/heap/cppgc/globals.h"
#include "src/heap/cppgc/heap-object-header.h"
#include "src/heap/cppgc/heap-page.h"
#include "src/heap/cppgc/heap-statistics-collector.h"
#include "src/heap/cppgc/heap-visitor.h"
#include "src/heap/cppgc/marker.h"
#include "src/heap/cppgc/marking-verifier.h"
#include "src/heap/cppgc/object-view.h"
#include "src/heap/cppgc/page-memory.h"
#include "src/heap/cppgc/prefinalizer-handler.h"
#include "src/heap/cppgc/stats-collector.h"
namespace cppgc {
namespace internal {
namespace {
class ObjectSizeCounter : private HeapVisitor<ObjectSizeCounter> {
friend class HeapVisitor<ObjectSizeCounter>;
public:
size_t GetSize(RawHeap& heap) {
Traverse(heap);
return accumulated_size_;
}
private:
static size_t ObjectSize(const HeapObjectHeader& header) {
return ObjectView(header).Size();
}
bool VisitHeapObjectHeader(HeapObjectHeader& header) {
if (header.IsFree()) return true;
accumulated_size_ += ObjectSize(header);
return true;
}
size_t accumulated_size_ = 0;
};
} // namespace
HeapBase::HeapBase(
std::shared_ptr<cppgc::Platform> platform,
const std::vector<std::unique_ptr<CustomSpaceBase>>& custom_spaces,
StackSupport stack_support)
: raw_heap_(this, custom_spaces),
platform_(std::move(platform)),
#if defined(LEAK_SANITIZER)
lsan_page_allocator_(std::make_unique<v8::base::LsanPageAllocator>(
platform_->GetPageAllocator())),
#endif // LEAK_SANITIZER
#if defined(CPPGC_CAGED_HEAP)
caged_heap_(this, page_allocator()),
page_backend_(std::make_unique<PageBackend>(&caged_heap_.allocator())),
#else // !CPPGC_CAGED_HEAP
page_backend_(std::make_unique<PageBackend>(page_allocator())),
#endif // !CPPGC_CAGED_HEAP
stats_collector_(std::make_unique<StatsCollector>(platform_.get())),
stack_(std::make_unique<heap::base::Stack>(
v8::base::Stack::GetStackStart())),
prefinalizer_handler_(std::make_unique<PreFinalizerHandler>(*this)),
compactor_(raw_heap_),
object_allocator_(&raw_heap_, page_backend_.get(),
stats_collector_.get()),
sweeper_(*this),
stack_support_(stack_support) {
stats_collector_->RegisterObserver(
&allocation_observer_for_PROCESS_HEAP_STATISTICS_);
}
HeapBase::~HeapBase() = default;
PageAllocator* HeapBase::page_allocator() const {
#if defined(LEAK_SANITIZER)
return lsan_page_allocator_.get();
#else // !LEAK_SANITIZER
return platform_->GetPageAllocator();
#endif // !LEAK_SANITIZER
}
size_t HeapBase::ObjectPayloadSize() const {
return ObjectSizeCounter().GetSize(const_cast<RawHeap&>(raw_heap()));
}
void HeapBase::AdvanceIncrementalGarbageCollectionOnAllocationIfNeeded() {
if (marker_) marker_->AdvanceMarkingOnAllocation();
}
void HeapBase::ExecutePreFinalizers() {
// Pre finalizers are forbidden from allocating objects.
cppgc::subtle::DisallowGarbageCollectionScope no_gc_scope(*this);
prefinalizer_handler_->InvokePreFinalizers();
}
void HeapBase::Terminate() {
DCHECK(!IsMarking());
CHECK(!in_disallow_gc_scope());
sweeper().FinishIfRunning();
constexpr size_t kMaxTerminationGCs = 20;
size_t gc_count = 0;
do {
CHECK_LT(gc_count++, kMaxTerminationGCs);
// Clear root sets.
strong_persistent_region_.ClearAllUsedNodes();
weak_persistent_region_.ClearAllUsedNodes();
{
PersistentRegionLock guard;
strong_cross_thread_persistent_region_.ClearAllUsedNodes();
weak_cross_thread_persistent_region_.ClearAllUsedNodes();
}
stats_collector()->NotifyMarkingStarted(
GarbageCollector::Config::CollectionType::kMajor,
GarbageCollector::Config::IsForcedGC::kForced);
object_allocator().ResetLinearAllocationBuffers();
stats_collector()->NotifyMarkingCompleted(0);
ExecutePreFinalizers();
sweeper().Start(
{Sweeper::SweepingConfig::SweepingType::kAtomic,
Sweeper::SweepingConfig::CompactableSpaceHandling::kSweep});
sweeper().NotifyDoneIfNeeded();
} while (strong_persistent_region_.NodesInUse() > 0);
object_allocator().Terminate();
disallow_gc_scope_++;
CHECK_EQ(0u, strong_persistent_region_.NodesInUse());
CHECK_EQ(0u, weak_persistent_region_.NodesInUse());
CHECK_EQ(0u, strong_cross_thread_persistent_region_.NodesInUse());
CHECK_EQ(0u, weak_cross_thread_persistent_region_.NodesInUse());
}
HeapStatistics HeapBase::CollectStatistics(
HeapStatistics::DetailLevel detail_level) {
if (detail_level == HeapStatistics::DetailLevel::kBrief) {
return {stats_collector_->allocated_memory_size(),
stats_collector_->resident_memory_size(),
stats_collector_->allocated_object_size(),
HeapStatistics::DetailLevel::kBrief,
{},
{}};
}
sweeper_.FinishIfRunning();
object_allocator_.ResetLinearAllocationBuffers();
return HeapStatisticsCollector().CollectDetailedStatistics(this);
}
} // namespace internal
} // namespace cppgc
|
