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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/execution/isolate.h"
#include "src/wasm/streaming-decoder.h"
#include "src/wasm/wasm-engine.h"
#include "src/wasm/wasm-objects-inl.h"
#include "src/wasm/wasm-serialization.h"
namespace v8 {
namespace internal {
namespace wasm {
class V8_EXPORT_PRIVATE SyncStreamingDecoder : public StreamingDecoder {
public:
SyncStreamingDecoder(Isolate* isolate, const WasmFeatures& enabled,
Handle<Context> context,
const char* api_method_name_for_errors,
std::shared_ptr<CompilationResultResolver> resolver)
: isolate_(isolate),
enabled_(enabled),
context_(context),
api_method_name_for_errors_(api_method_name_for_errors),
resolver_(resolver) {}
// The buffer passed into OnBytesReceived is owned by the caller.
void OnBytesReceived(base::Vector<const uint8_t> bytes) override {
buffer_.emplace_back(bytes.size());
CHECK_EQ(buffer_.back().size(), bytes.size());
std::memcpy(buffer_.back().data(), bytes.data(), bytes.size());
buffer_size_ += bytes.size();
}
void Finish(bool can_use_compiled_module) override {
// We copy all received chunks into one byte buffer.
auto bytes = std::make_unique<uint8_t[]>(buffer_size_);
uint8_t* destination = bytes.get();
for (auto& chunk : buffer_) {
std::memcpy(destination, chunk.data(), chunk.size());
destination += chunk.size();
}
CHECK_EQ(destination - bytes.get(), buffer_size_);
// Check if we can deserialize the module from cache.
if (can_use_compiled_module && deserializing()) {
HandleScope scope(isolate_);
SaveAndSwitchContext saved_context(isolate_, *context_);
MaybeHandle<WasmModuleObject> module_object = DeserializeNativeModule(
isolate_, compiled_module_bytes_,
base::Vector<const uint8_t>(bytes.get(), buffer_size_),
base::VectorOf(url()));
if (!module_object.is_null()) {
Handle<WasmModuleObject> module = module_object.ToHandleChecked();
resolver_->OnCompilationSucceeded(module);
return;
}
}
// Compile the received bytes synchronously.
ModuleWireBytes wire_bytes(bytes.get(), bytes.get() + buffer_size_);
ErrorThrower thrower(isolate_, api_method_name_for_errors_);
MaybeHandle<WasmModuleObject> module_object =
GetWasmEngine()->SyncCompile(isolate_, enabled_, &thrower, wire_bytes);
if (thrower.error()) {
resolver_->OnCompilationFailed(thrower.Reify());
return;
}
Handle<WasmModuleObject> module = module_object.ToHandleChecked();
resolver_->OnCompilationSucceeded(module);
}
void Abort() override {
// Abort is fully handled by the API, we only clear the buffer.
buffer_.clear();
}
void NotifyCompilationEnded() override { buffer_.clear(); }
void NotifyNativeModuleCreated(
const std::shared_ptr<NativeModule>&) override {
// This function is only called from the {AsyncCompileJob}.
UNREACHABLE();
}
private:
Isolate* isolate_;
const WasmFeatures enabled_;
Handle<Context> context_;
const char* api_method_name_for_errors_;
std::shared_ptr<CompilationResultResolver> resolver_;
std::vector<std::vector<uint8_t>> buffer_;
size_t buffer_size_ = 0;
};
std::unique_ptr<StreamingDecoder> StreamingDecoder::CreateSyncStreamingDecoder(
Isolate* isolate, const WasmFeatures& enabled, Handle<Context> context,
const char* api_method_name_for_errors,
std::shared_ptr<CompilationResultResolver> resolver) {
return std::make_unique<SyncStreamingDecoder>(isolate, enabled, context,
api_method_name_for_errors,
std::move(resolver));
}
} // namespace wasm
} // namespace internal
} // namespace v8
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