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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/cppgc/virtual-memory.h"
#include "include/cppgc/platform.h"
#include "src/base/macros.h"
namespace cppgc {
namespace internal {
VirtualMemory::VirtualMemory(PageAllocator* page_allocator, size_t size,
size_t alignment, void* hint)
: page_allocator_(page_allocator) {
DCHECK_NOT_NULL(page_allocator);
DCHECK(IsAligned(size, page_allocator->CommitPageSize()));
const size_t page_size = page_allocator_->AllocatePageSize();
start_ = page_allocator->AllocatePages(hint, RoundUp(size, page_size),
RoundUp(alignment, page_size),
PageAllocator::kNoAccess);
if (start_) {
size_ = RoundUp(size, page_size);
}
}
VirtualMemory::~VirtualMemory() V8_NOEXCEPT {
if (IsReserved()) {
page_allocator_->FreePages(start_, size_);
}
}
VirtualMemory::VirtualMemory(VirtualMemory&& other) V8_NOEXCEPT
: page_allocator_(std::move(other.page_allocator_)),
start_(std::move(other.start_)),
size_(std::move(other.size_)) {
other.Reset();
}
VirtualMemory& VirtualMemory::operator=(VirtualMemory&& other) V8_NOEXCEPT {
DCHECK(!IsReserved());
page_allocator_ = std::move(other.page_allocator_);
start_ = std::move(other.start_);
size_ = std::move(other.size_);
other.Reset();
return *this;
}
void VirtualMemory::Reset() {
start_ = nullptr;
size_ = 0;
}
} // namespace internal
} // namespace cppgc
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