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// Copyright 2017 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_WASM_MEMORY_H_
#define V8_WASM_MEMORY_H_
#include "src/flags.h"
#include "src/handles.h"
#include "src/objects/js-array.h"
namespace v8 {
namespace internal {
namespace wasm {
class WasmAllocationTracker {
public:
WasmAllocationTracker() {}
~WasmAllocationTracker();
// ReserveAddressSpace attempts to increase the reserved address space counter
// to determine whether there is enough headroom to allocate another guarded
// Wasm memory. Returns true if successful (meaning it is okay to go ahead and
// allocate the buffer), false otherwise.
bool ReserveAddressSpace(size_t num_bytes);
// Reduces the address space counter so that the space can be reused.
void ReleaseAddressSpace(size_t num_bytes);
private:
std::atomic_size_t allocated_address_space_{0};
DISALLOW_COPY_AND_ASSIGN(WasmAllocationTracker);
};
Handle<JSArrayBuffer> NewArrayBuffer(
Isolate*, size_t size, bool require_guard_regions,
SharedFlag shared = SharedFlag::kNotShared);
Handle<JSArrayBuffer> SetupArrayBuffer(
Isolate*, void* allocation_base, size_t allocation_length,
void* backing_store, size_t size, bool is_external,
bool enable_guard_regions, SharedFlag shared = SharedFlag::kNotShared);
void DetachMemoryBuffer(Isolate* isolate, Handle<JSArrayBuffer> buffer,
bool free_memory);
} // namespace wasm
} // namespace internal
} // namespace v8
#endif // V8_WASM_MODULE_H_
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