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// Copyright 2023 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.
#if !V8_ENABLE_WEBASSEMBLY
#error This header should only be included if WebAssembly is enabled.
#endif // !V8_ENABLE_WEBASSEMBLY
#ifndef V8_WASM_WELL_KNOWN_IMPORTS_H_
#define V8_WASM_WELL_KNOWN_IMPORTS_H_
#include <memory>
#include "src/base/atomicops.h"
#include "src/base/platform/mutex.h"
#include "src/base/vector.h"
#include "src/common/globals.h"
namespace v8::internal::wasm {
enum class WellKnownImport : uint8_t {
kUninstantiated,
kGeneric,
kStringToLowerCaseStringref,
};
class NativeModule;
// For debugging/tracing.
const char* WellKnownImportName(WellKnownImport wki);
class WellKnownImportsList {
public:
enum class UpdateResult : bool { kFoundIncompatibility, kOK };
WellKnownImportsList() = default;
// Regular initialization. Allocates size-dependent internal data.
void Initialize(int size) {
#if DEBUG
DCHECK_EQ(-1, size_);
size_ = size;
#endif
static_assert(static_cast<int>(WellKnownImport::kUninstantiated) == 0);
statuses_ = std::make_unique<std::atomic<WellKnownImport>[]>(size);
#if !defined(__cpp_lib_atomic_value_initialization) || \
__cpp_lib_atomic_value_initialization < 201911L
for (int i = 0; i < size; i++) {
std::atomic_init(&statuses_.get()[i], WellKnownImport::kUninstantiated);
}
#endif
}
// Intended for deserialization. Does not check consistency with code.
void Initialize(base::Vector<const WellKnownImport> entries);
WellKnownImport get(int index) const {
DCHECK_LT(index, size_);
return statuses_[index].load(std::memory_order_relaxed);
}
V8_WARN_UNUSED_RESULT UpdateResult
Update(base::Vector<WellKnownImport> entries);
// If you need this mutex and the NativeModule's allocation_mutex_, always
// get the latter first.
base::Mutex* mutex() { return &mutex_; }
private:
// This mutex guards {statuses_}, for operations that need to ensure that
// they see a consistent view of {statutes_} for some period of time.
base::Mutex mutex_;
std::unique_ptr<std::atomic<WellKnownImport>[]> statuses_;
#if DEBUG
int size_{-1};
#endif
};
} // namespace v8::internal::wasm
#endif // V8_WASM_WELL_KNOWN_IMPORTS_H_
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