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// 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/heap-allocator.h"
#include "src/base/logging.h"
#include "src/common/globals.h"
#include "src/execution/isolate.h"
#include "src/heap/heap-allocator-inl.h"
#include "src/heap/heap-inl.h"
#include "src/logging/counters.h"
namespace v8 {
namespace internal {
class Heap;
HeapAllocator::HeapAllocator(Heap* heap) : heap_(heap) {}
void HeapAllocator::Setup() {
for (int i = FIRST_SPACE; i <= LAST_SPACE; ++i) {
spaces_[i] = heap_->space(i);
}
shared_old_allocator_ = heap_->shared_space_allocator_.get();
shared_lo_space_ = heap_->shared_lo_allocation_space();
}
void HeapAllocator::SetReadOnlySpace(ReadOnlySpace* read_only_space) {
read_only_space_ = read_only_space;
}
AllocationResult HeapAllocator::AllocateRawLargeInternal(
int size_in_bytes, AllocationType allocation, AllocationOrigin origin,
AllocationAlignment alignment) {
DCHECK_GT(size_in_bytes, heap_->MaxRegularHeapObjectSize(allocation));
switch (allocation) {
case AllocationType::kYoung:
return new_lo_space()->AllocateRaw(size_in_bytes);
case AllocationType::kOld:
return lo_space()->AllocateRaw(size_in_bytes);
case AllocationType::kCode:
return code_lo_space()->AllocateRaw(size_in_bytes);
case AllocationType::kSharedOld:
return shared_lo_space()->AllocateRawBackground(
heap_->main_thread_local_heap(), size_in_bytes);
case AllocationType::kMap:
case AllocationType::kReadOnly:
case AllocationType::kSharedMap:
UNREACHABLE();
}
}
namespace {
constexpr AllocationSpace AllocationTypeToGCSpace(AllocationType type) {
switch (type) {
case AllocationType::kYoung:
return NEW_SPACE;
case AllocationType::kOld:
case AllocationType::kCode:
case AllocationType::kMap:
// OLD_SPACE indicates full GC.
return OLD_SPACE;
case AllocationType::kReadOnly:
case AllocationType::kSharedMap:
case AllocationType::kSharedOld:
UNREACHABLE();
}
}
} // namespace
AllocationResult HeapAllocator::AllocateRawWithLightRetrySlowPath(
int size, AllocationType allocation, AllocationOrigin origin,
AllocationAlignment alignment) {
AllocationResult result = AllocateRaw(size, allocation, origin, alignment);
if (!result.IsFailure()) {
return result;
}
// Two GCs before returning failure.
for (int i = 0; i < 2; i++) {
if (IsSharedAllocationType(allocation)) {
heap_->CollectGarbageShared(heap_->main_thread_local_heap(),
GarbageCollectionReason::kAllocationFailure);
} else {
AllocationSpace space_to_gc = AllocationTypeToGCSpace(allocation);
heap_->CollectGarbage(space_to_gc,
GarbageCollectionReason::kAllocationFailure);
}
result = AllocateRaw(size, allocation, origin, alignment);
if (!result.IsFailure()) {
return result;
}
}
return result;
}
AllocationResult HeapAllocator::AllocateRawWithRetryOrFailSlowPath(
int size, AllocationType allocation, AllocationOrigin origin,
AllocationAlignment alignment) {
AllocationResult result =
AllocateRawWithLightRetrySlowPath(size, allocation, origin, alignment);
if (!result.IsFailure()) return result;
if (IsSharedAllocationType(allocation)) {
heap_->CollectGarbageShared(heap_->main_thread_local_heap(),
GarbageCollectionReason::kLastResort);
// We need always_allocate() to be true both on the client- and
// server-isolate. It is used in both code paths.
AlwaysAllocateScope shared_scope(
heap_->isolate()->shared_space_isolate()->heap());
AlwaysAllocateScope client_scope(heap_);
result = AllocateRaw(size, allocation, origin, alignment);
} else {
heap_->CollectAllAvailableGarbage(GarbageCollectionReason::kLastResort);
AlwaysAllocateScope scope(heap_);
result = AllocateRaw(size, allocation, origin, alignment);
}
if (!result.IsFailure()) {
return result;
}
V8::FatalProcessOutOfMemory(heap_->isolate(), "CALL_AND_RETRY_LAST",
V8::kHeapOOM);
}
#ifdef DEBUG
void HeapAllocator::IncrementObjectCounters() {
heap_->isolate()->counters()->objs_since_last_full()->Increment();
heap_->isolate()->counters()->objs_since_last_young()->Increment();
}
#endif // DEBUG
#ifdef V8_ENABLE_ALLOCATION_TIMEOUT
// static
void HeapAllocator::InitializeOncePerProcess() {
SetAllocationGcInterval(v8_flags.gc_interval);
}
// static
void HeapAllocator::SetAllocationGcInterval(int allocation_gc_interval) {
allocation_gc_interval_.store(allocation_gc_interval,
std::memory_order_relaxed);
}
// static
std::atomic<int> HeapAllocator::allocation_gc_interval_{-1};
void HeapAllocator::SetAllocationTimeout(int allocation_timeout) {
// See `allocation_timeout_` for description. We map negative values to 0 to
// avoid underflows as allocation decrements this value as well.
allocation_timeout_ = std::max(0, allocation_timeout);
}
void HeapAllocator::UpdateAllocationTimeout() {
if (v8_flags.random_gc_interval > 0) {
const int new_timeout = allocation_timeout_ <= 0
? heap_->isolate()->fuzzer_rng()->NextInt(
v8_flags.random_gc_interval + 1)
: allocation_timeout_;
// Reset the allocation timeout, but make sure to allow at least a few
// allocations after a collection. The reason for this is that we have a lot
// of allocation sequences and we assume that a garbage collection will
// allow the subsequent allocation attempts to go through.
constexpr int kFewAllocationsHeadroom = 6;
allocation_timeout_ = std::max(kFewAllocationsHeadroom, new_timeout);
return;
}
int interval = allocation_gc_interval_.load(std::memory_order_relaxed);
if (interval >= 0) {
allocation_timeout_ = interval;
}
}
#endif // V8_ENABLE_ALLOCATION_TIMEOUT
} // namespace internal
} // namespace v8
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