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// Copyright 2018 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/wasm/wasm-engine.h"
#include "src/code-tracer.h"
#include "src/compilation-statistics.h"
#include "src/objects-inl.h"
#include "src/objects/js-promise.h"
#include "src/wasm/module-compiler.h"
#include "src/wasm/module-decoder.h"
#include "src/wasm/streaming-decoder.h"
#include "src/wasm/wasm-objects.h"
namespace v8 {
namespace internal {
namespace wasm {
WasmEngine::WasmEngine(std::unique_ptr<WasmCodeManager> code_manager)
: code_manager_(std::move(code_manager)) {}
WasmEngine::~WasmEngine() = default;
bool WasmEngine::SyncValidate(Isolate* isolate, const ModuleWireBytes& bytes) {
// TODO(titzer): remove dependency on the isolate.
if (bytes.start() == nullptr || bytes.length() == 0) return false;
ModuleResult result = SyncDecodeWasmModule(isolate, bytes.start(),
bytes.end(), true, kWasmOrigin);
return result.ok();
}
MaybeHandle<WasmModuleObject> WasmEngine::SyncCompileTranslatedAsmJs(
Isolate* isolate, ErrorThrower* thrower, const ModuleWireBytes& bytes,
Handle<Script> asm_js_script,
Vector<const byte> asm_js_offset_table_bytes) {
ModuleResult result = SyncDecodeWasmModule(isolate, bytes.start(),
bytes.end(), false, kAsmJsOrigin);
CHECK(!result.failed());
// Transfer ownership of the WasmModule to the {Managed<WasmModule>} generated
// in {CompileToModuleObject}.
return CompileToModuleObject(isolate, thrower, std::move(result.val), bytes,
asm_js_script, asm_js_offset_table_bytes);
}
MaybeHandle<WasmModuleObject> WasmEngine::SyncCompile(
Isolate* isolate, ErrorThrower* thrower, const ModuleWireBytes& bytes) {
ModuleResult result = SyncDecodeWasmModule(isolate, bytes.start(),
bytes.end(), false, kWasmOrigin);
if (result.failed()) {
thrower->CompileFailed("Wasm decoding failed", result);
return {};
}
// Transfer ownership of the WasmModule to the {Managed<WasmModule>} generated
// in {CompileToModuleObject}.
return CompileToModuleObject(isolate, thrower, std::move(result.val), bytes,
Handle<Script>(), Vector<const byte>());
}
MaybeHandle<WasmInstanceObject> WasmEngine::SyncInstantiate(
Isolate* isolate, ErrorThrower* thrower,
Handle<WasmModuleObject> module_object, MaybeHandle<JSReceiver> imports,
MaybeHandle<JSArrayBuffer> memory) {
return InstantiateToInstanceObject(isolate, thrower, module_object, imports,
memory);
}
void WasmEngine::AsyncInstantiate(
Isolate* isolate, std::unique_ptr<InstantiationResultResolver> resolver,
Handle<WasmModuleObject> module_object, MaybeHandle<JSReceiver> imports) {
ErrorThrower thrower(isolate, nullptr);
// Instantiate a TryCatch so that caught exceptions won't progagate out.
// They will still be set as pending exceptions on the isolate.
// TODO(clemensh): Avoid TryCatch, use Execution::TryCall internally to invoke
// start function and report thrown exception explicitly via out argument.
v8::TryCatch catcher(reinterpret_cast<v8::Isolate*>(isolate));
catcher.SetVerbose(false);
catcher.SetCaptureMessage(false);
MaybeHandle<WasmInstanceObject> instance_object = SyncInstantiate(
isolate, &thrower, module_object, imports, Handle<JSArrayBuffer>::null());
if (!instance_object.is_null()) {
resolver->OnInstantiationSucceeded(instance_object.ToHandleChecked());
return;
}
// We either have a pending exception (if the start function threw), or an
// exception in the ErrorThrower.
DCHECK_EQ(1, isolate->has_pending_exception() + thrower.error());
if (thrower.error()) {
resolver->OnInstantiationFailed(thrower.Reify());
} else {
// The start function has thrown an exception. We have to move the
// exception to the promise chain.
Handle<Object> exception(isolate->pending_exception(), isolate);
isolate->clear_pending_exception();
DCHECK(*isolate->external_caught_exception_address());
*isolate->external_caught_exception_address() = false;
resolver->OnInstantiationFailed(exception);
}
}
void WasmEngine::AsyncCompile(
Isolate* isolate, std::unique_ptr<CompilationResultResolver> resolver,
const ModuleWireBytes& bytes, bool is_shared) {
if (!FLAG_wasm_async_compilation) {
// Asynchronous compilation disabled; fall back on synchronous compilation.
ErrorThrower thrower(isolate, "WasmCompile");
MaybeHandle<WasmModuleObject> module_object;
if (is_shared) {
// Make a copy of the wire bytes to avoid concurrent modification.
std::unique_ptr<uint8_t[]> copy(new uint8_t[bytes.length()]);
memcpy(copy.get(), bytes.start(), bytes.length());
i::wasm::ModuleWireBytes bytes_copy(copy.get(),
copy.get() + bytes.length());
module_object = SyncCompile(isolate, &thrower, bytes_copy);
} else {
// The wire bytes are not shared, OK to use them directly.
module_object = SyncCompile(isolate, &thrower, bytes);
}
if (thrower.error()) {
resolver->OnCompilationFailed(thrower.Reify());
return;
}
Handle<WasmModuleObject> module = module_object.ToHandleChecked();
resolver->OnCompilationSucceeded(module);
return;
}
if (FLAG_wasm_test_streaming) {
std::shared_ptr<StreamingDecoder> streaming_decoder =
isolate->wasm_engine()->StartStreamingCompilation(
isolate, handle(isolate->context(), isolate), std::move(resolver));
streaming_decoder->OnBytesReceived(bytes.module_bytes());
streaming_decoder->Finish();
return;
}
// Make a copy of the wire bytes in case the user program changes them
// during asynchronous compilation.
std::unique_ptr<byte[]> copy(new byte[bytes.length()]);
memcpy(copy.get(), bytes.start(), bytes.length());
AsyncCompileJob* job = CreateAsyncCompileJob(
isolate, std::move(copy), bytes.length(),
handle(isolate->context(), isolate), std::move(resolver));
job->Start();
}
std::shared_ptr<StreamingDecoder> WasmEngine::StartStreamingCompilation(
Isolate* isolate, Handle<Context> context,
std::unique_ptr<CompilationResultResolver> resolver) {
AsyncCompileJob* job =
CreateAsyncCompileJob(isolate, std::unique_ptr<byte[]>(nullptr), 0,
context, std::move(resolver));
return job->CreateStreamingDecoder();
}
CompilationStatistics* WasmEngine::GetOrCreateTurboStatistics() {
base::LockGuard<base::Mutex> guard(&mutex_);
if (compilation_stats_ == nullptr) {
compilation_stats_.reset(new CompilationStatistics());
}
return compilation_stats_.get();
}
void WasmEngine::DumpAndResetTurboStatistics() {
base::LockGuard<base::Mutex> guard(&mutex_);
if (compilation_stats_ != nullptr) {
StdoutStream os;
os << AsPrintableStatistics{*compilation_stats_.get(), false} << std::endl;
}
compilation_stats_.reset();
}
CodeTracer* WasmEngine::GetCodeTracer() {
base::LockGuard<base::Mutex> guard(&mutex_);
if (code_tracer_ == nullptr) code_tracer_.reset(new CodeTracer(-1));
return code_tracer_.get();
}
void WasmEngine::Register(CancelableTaskManager* task_manager) {
task_managers_.emplace_back(task_manager);
}
void WasmEngine::Unregister(CancelableTaskManager* task_manager) {
task_managers_.remove(task_manager);
}
AsyncCompileJob* WasmEngine::CreateAsyncCompileJob(
Isolate* isolate, std::unique_ptr<byte[]> bytes_copy, size_t length,
Handle<Context> context,
std::unique_ptr<CompilationResultResolver> resolver) {
AsyncCompileJob* job = new AsyncCompileJob(
isolate, std::move(bytes_copy), length, context, std::move(resolver));
// Pass ownership to the unique_ptr in {jobs_}.
jobs_[job] = std::unique_ptr<AsyncCompileJob>(job);
return job;
}
std::unique_ptr<AsyncCompileJob> WasmEngine::RemoveCompileJob(
AsyncCompileJob* job) {
auto item = jobs_.find(job);
DCHECK(item != jobs_.end());
std::unique_ptr<AsyncCompileJob> result = std::move(item->second);
jobs_.erase(item);
return result;
}
void WasmEngine::AbortCompileJobsOnIsolate(Isolate* isolate) {
// Iterate over a copy of {jobs_}, because {job->Abort} modifies {jobs_}.
std::vector<AsyncCompileJob*> isolate_jobs;
for (auto& entry : jobs_) {
if (entry.first->isolate() != isolate) continue;
isolate_jobs.push_back(entry.first);
}
for (auto* job : isolate_jobs) job->Abort();
}
void WasmEngine::TearDown() {
// Cancel all registered task managers.
for (auto task_manager : task_managers_) {
task_manager->CancelAndWait();
}
// Cancel all AsyncCompileJobs.
jobs_.clear();
}
} // namespace wasm
} // namespace internal
} // namespace v8
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