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
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
/*
* Copyright (C) 2017-2024 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "Subspace.h"
#include "AlignedMemoryAllocator.h"
#include "AllocatorInlines.h"
#include "JSCellInlines.h"
#include "LocalAllocatorInlines.h"
#include "MarkedSpaceInlines.h"
#include "SubspaceInlines.h"
#include <wtf/RAMSize.h>
namespace JSC {
CompleteSubspace::CompleteSubspace(CString name, JSC::Heap& heap, const HeapCellType& heapCellType, AlignedMemoryAllocator* alignedMemoryAllocator)
: Subspace(SubspaceKind::CompleteSubspace, name, heap)
{
initialize(heapCellType, alignedMemoryAllocator);
}
CompleteSubspace::~CompleteSubspace() = default;
Allocator CompleteSubspace::allocatorForNonInline(size_t size, AllocatorForMode mode)
{
return allocatorFor(size, mode);
}
Allocator CompleteSubspace::allocatorForSlow(size_t size)
{
size_t index = MarkedSpace::sizeClassToIndex(size);
size_t sizeClass = MarkedSpace::s_sizeClassForSizeStep[index];
if (!sizeClass)
return Allocator();
// This is written in such a way that it's OK for the JIT threads to end up here if they want
// to generate code that uses some allocator that hadn't been used yet. Note that a possibly-
// just-as-good solution would be to return null if we're in the JIT since the JIT treats null
// allocator as "please always take the slow path". But, that could lead to performance
// surprises and the algorithm here is pretty easy. Only this code has to hold the lock, to
// prevent simultaneously BlockDirectory creations from multiple threads. This code ensures
// that any "forEachAllocator" traversals will only see this allocator after it's initialized
// enough: it will have
Locker locker { m_space.directoryLock() };
if (Allocator allocator = m_allocatorForSizeStep[index])
return allocator;
if (false)
dataLog("Creating BlockDirectory/LocalAllocator for ", m_name, ", ", attributes(), ", ", sizeClass, ".\n");
std::unique_ptr<BlockDirectory> uniqueDirectory = makeUnique<BlockDirectory>(sizeClass);
BlockDirectory* directory = uniqueDirectory.get();
m_directories.append(WTFMove(uniqueDirectory));
directory->setSubspace(this);
m_space.addBlockDirectory(locker, directory);
std::unique_ptr<LocalAllocator> uniqueLocalAllocator =
makeUnique<LocalAllocator>(directory);
LocalAllocator* localAllocator = uniqueLocalAllocator.get();
m_localAllocators.append(WTFMove(uniqueLocalAllocator));
Allocator allocator(localAllocator);
index = MarkedSpace::sizeClassToIndex(sizeClass);
for (;;) {
if (MarkedSpace::s_sizeClassForSizeStep[index] != sizeClass)
break;
m_allocatorForSizeStep[index] = allocator;
if (!index--)
break;
}
directory->setNextDirectoryInSubspace(m_firstDirectory);
m_alignedMemoryAllocator->registerDirectory(m_space.heap(), directory);
WTF::storeStoreFence();
m_firstDirectory = directory;
return allocator;
}
void* CompleteSubspace::allocateSlow(VM& vm, size_t size, GCDeferralContext* deferralContext, AllocationFailureMode failureMode)
{
void* result = tryAllocateSlow(vm, size, deferralContext);
if (failureMode == AllocationFailureMode::Assert)
RELEASE_ASSERT(result);
return result;
}
void* CompleteSubspace::tryAllocateSlow(VM& vm, size_t size, GCDeferralContext* deferralContext)
{
if constexpr (validateDFGDoesGC)
vm.verifyCanGC();
sanitizeStackForVM(vm);
if (Allocator allocator = allocatorForNonInline(size, AllocatorForMode::EnsureAllocator))
return allocator.allocate(vm.heap, allocator.cellSize(), deferralContext, AllocationFailureMode::ReturnNull);
if (size <= Options::preciseAllocationCutoff()
&& size <= MarkedSpace::largeCutoff) {
dataLog("FATAL: attampting to allocate small object using large allocation.\n");
dataLog("Requested allocation size: ", size, "\n");
RELEASE_ASSERT_NOT_REACHED();
}
vm.heap.collectIfNecessaryOrDefer(deferralContext);
if (UNLIKELY(Options::maxHeapSizeAsRAMSizeMultiple())) {
if (vm.heap.capacity() > Options::maxHeapSizeAsRAMSizeMultiple() * WTF::ramSize())
return nullptr;
}
size = WTF::roundUpToMultipleOf<MarkedSpace::sizeStep>(size);
PreciseAllocation* allocation = PreciseAllocation::tryCreate(vm.heap, size, this, m_space.m_preciseAllocations.size());
if (!allocation)
return nullptr;
m_preciseAllocations.append(allocation);
m_space.registerPreciseAllocation(allocation, /* isNewAllocation */ true);
return allocation->cell();
}
void* CompleteSubspace::reallocatePreciseAllocationNonVirtual(VM& vm, HeapCell* oldCell, size_t size, GCDeferralContext* deferralContext, AllocationFailureMode failureMode)
{
if constexpr (validateDFGDoesGC)
vm.verifyCanGC();
// The following conditions are met in Butterfly for example.
ASSERT(oldCell->isPreciseAllocation());
PreciseAllocation* oldAllocation = &oldCell->preciseAllocation();
ASSERT(oldAllocation->cellSize() <= size);
ASSERT(oldAllocation->weakSet().isTriviallyDestructible());
ASSERT(oldAllocation->attributes().destruction == DoesNotNeedDestruction);
ASSERT(oldAllocation->attributes().cellKind == HeapCell::Auxiliary);
ASSERT(size > MarkedSpace::largeCutoff);
sanitizeStackForVM(vm);
if (size <= Options::preciseAllocationCutoff()
&& size <= MarkedSpace::largeCutoff) {
dataLog("FATAL: attampting to allocate small object using large allocation.\n");
dataLog("Requested allocation size: ", size, "\n");
RELEASE_ASSERT_NOT_REACHED();
}
vm.heap.collectIfNecessaryOrDefer(deferralContext);
size = WTF::roundUpToMultipleOf<MarkedSpace::sizeStep>(size);
size_t difference = size - oldAllocation->cellSize();
unsigned oldIndexInSpace = oldAllocation->indexInSpace();
if (oldAllocation->isOnList())
oldAllocation->remove();
PreciseAllocation* allocation = oldAllocation->tryReallocate(size, this);
if (!allocation) {
RELEASE_ASSERT(failureMode != AllocationFailureMode::Assert);
m_preciseAllocations.append(oldAllocation);
return nullptr;
}
ASSERT(oldIndexInSpace == allocation->indexInSpace());
// If reallocation changes the address, we should update HashSet.
if (oldAllocation != allocation) {
if (auto* set = m_space.preciseAllocationSet()) {
set->remove(oldAllocation->cell());
set->add(allocation->cell());
}
}
m_space.m_preciseAllocations[oldIndexInSpace] = allocation;
vm.heap.didAllocate(difference);
m_space.m_capacity += difference;
m_preciseAllocations.append(allocation);
return allocation->cell();
}
} // namespace JSC
|
