blob: 9d88ac6d203d12f6fd8a949879748fef362e4424 [file] [log] [blame]
// Copyright 2015 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-js.h"
#include <cinttypes>
#include <cstring>
#include "src/api/api-inl.h"
#include "src/api/api-natives.h"
#include "src/ast/ast.h"
#include "src/base/overflowing-math.h"
#include "src/common/assert-scope.h"
#include "src/execution/execution.h"
#include "src/execution/isolate.h"
#include "src/handles/handles.h"
#include "src/heap/factory.h"
#include "src/init/v8.h"
#include "src/objects/js-promise-inl.h"
#include "src/objects/objects-inl.h"
#include "src/objects/templates.h"
#include "src/parsing/parse-info.h"
#include "src/tasks/task-utils.h"
#include "src/trap-handler/trap-handler.h"
#include "src/wasm/streaming-decoder.h"
#include "src/wasm/wasm-engine.h"
#include "src/wasm/wasm-limits.h"
#include "src/wasm/wasm-memory.h"
#include "src/wasm/wasm-objects-inl.h"
#include "src/wasm/wasm-serialization.h"
using v8::internal::wasm::ErrorThrower;
namespace v8 {
class WasmStreaming::WasmStreamingImpl {
public:
WasmStreamingImpl(
Isolate* isolate, const char* api_method_name,
std::shared_ptr<internal::wasm::CompilationResultResolver> resolver)
: isolate_(isolate), resolver_(std::move(resolver)) {
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate_);
auto enabled_features = i::wasm::WasmFeaturesFromIsolate(i_isolate);
streaming_decoder_ = i_isolate->wasm_engine()->StartStreamingCompilation(
i_isolate, enabled_features, handle(i_isolate->context(), i_isolate),
api_method_name, resolver_);
}
void OnBytesReceived(const uint8_t* bytes, size_t size) {
streaming_decoder_->OnBytesReceived(i::VectorOf(bytes, size));
}
void Finish() { streaming_decoder_->Finish(); }
void Abort(MaybeLocal<Value> exception) {
i::HandleScope scope(reinterpret_cast<i::Isolate*>(isolate_));
streaming_decoder_->Abort();
// If no exception value is provided, we do not reject the promise. This can
// happen when streaming compilation gets aborted when no script execution
// is allowed anymore, e.g. when a browser tab gets refreshed.
if (exception.IsEmpty()) return;
resolver_->OnCompilationFailed(
Utils::OpenHandle(*exception.ToLocalChecked()));
}
bool SetCompiledModuleBytes(const uint8_t* bytes, size_t size) {
if (!i::wasm::IsSupportedVersion({bytes, size})) return false;
return streaming_decoder_->SetCompiledModuleBytes({bytes, size});
}
void SetClient(std::shared_ptr<Client> client) {
// There are no other event notifications so just pass client to decoder.
// Wrap the client with a callback to trigger the callback in a new
// foreground task.
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate_);
v8::Platform* platform = i::V8::GetCurrentPlatform();
std::shared_ptr<TaskRunner> foreground_task_runner =
platform->GetForegroundTaskRunner(isolate_);
streaming_decoder_->SetModuleCompiledCallback(
[client, i_isolate, foreground_task_runner](
const std::shared_ptr<i::wasm::NativeModule>& native_module) {
foreground_task_runner->PostTask(
i::MakeCancelableTask(i_isolate, [client, native_module] {
client->OnModuleCompiled(Utils::Convert(native_module));
}));
});
}
private:
Isolate* const isolate_;
std::shared_ptr<internal::wasm::StreamingDecoder> streaming_decoder_;
std::shared_ptr<internal::wasm::CompilationResultResolver> resolver_;
};
WasmStreaming::WasmStreaming(std::unique_ptr<WasmStreamingImpl> impl)
: impl_(std::move(impl)) {}
// The destructor is defined here because we have a unique_ptr with forward
// declaration.
WasmStreaming::~WasmStreaming() = default;
void WasmStreaming::OnBytesReceived(const uint8_t* bytes, size_t size) {
impl_->OnBytesReceived(bytes, size);
}
void WasmStreaming::Finish() { impl_->Finish(); }
void WasmStreaming::Abort(MaybeLocal<Value> exception) {
impl_->Abort(exception);
}
bool WasmStreaming::SetCompiledModuleBytes(const uint8_t* bytes, size_t size) {
return impl_->SetCompiledModuleBytes(bytes, size);
}
void WasmStreaming::SetClient(std::shared_ptr<Client> client) {
impl_->SetClient(client);
}
// static
std::shared_ptr<WasmStreaming> WasmStreaming::Unpack(Isolate* isolate,
Local<Value> value) {
i::HandleScope scope(reinterpret_cast<i::Isolate*>(isolate));
auto managed =
i::Handle<i::Managed<WasmStreaming>>::cast(Utils::OpenHandle(*value));
return managed->get();
}
namespace {
#define ASSIGN(type, var, expr) \
Local<type> var; \
do { \
if (!expr.ToLocal(&var)) { \
DCHECK(i_isolate->has_scheduled_exception()); \
return; \
} else { \
DCHECK(!i_isolate->has_scheduled_exception()); \
} \
} while (false)
// Like an ErrorThrower, but turns all pending exceptions into scheduled
// exceptions when going out of scope. Use this in API methods.
// Note that pending exceptions are not necessarily created by the ErrorThrower,
// but e.g. by the wasm start function. There might also be a scheduled
// exception, created by another API call (e.g. v8::Object::Get). But there
// should never be both pending and scheduled exceptions.
class ScheduledErrorThrower : public ErrorThrower {
public:
ScheduledErrorThrower(i::Isolate* isolate, const char* context)
: ErrorThrower(isolate, context) {}
~ScheduledErrorThrower();
};
ScheduledErrorThrower::~ScheduledErrorThrower() {
// There should never be both a pending and a scheduled exception.
DCHECK(!isolate()->has_scheduled_exception() ||
!isolate()->has_pending_exception());
// Don't throw another error if there is already a scheduled error.
if (isolate()->has_scheduled_exception()) {
Reset();
} else if (isolate()->has_pending_exception()) {
Reset();
isolate()->OptionalRescheduleException(false);
} else if (error()) {
isolate()->ScheduleThrow(*Reify());
}
}
i::Handle<i::String> v8_str(i::Isolate* isolate, const char* str) {
return isolate->factory()->NewStringFromAsciiChecked(str);
}
Local<String> v8_str(Isolate* isolate, const char* str) {
return Utils::ToLocal(v8_str(reinterpret_cast<i::Isolate*>(isolate), str));
}
#define GET_FIRST_ARGUMENT_AS(Type) \
i::MaybeHandle<i::Wasm##Type##Object> GetFirstArgumentAs##Type( \
const v8::FunctionCallbackInfo<v8::Value>& args, \
ErrorThrower* thrower) { \
i::Handle<i::Object> arg0 = Utils::OpenHandle(*args[0]); \
if (!arg0->IsWasm##Type##Object()) { \
thrower->TypeError("Argument 0 must be a WebAssembly." #Type); \
return {}; \
} \
Local<Object> obj = Local<Object>::Cast(args[0]); \
return i::Handle<i::Wasm##Type##Object>::cast( \
v8::Utils::OpenHandle(*obj)); \
}
GET_FIRST_ARGUMENT_AS(Module)
GET_FIRST_ARGUMENT_AS(Memory)
GET_FIRST_ARGUMENT_AS(Table)
GET_FIRST_ARGUMENT_AS(Global)
#undef GET_FIRST_ARGUMENT_AS
i::wasm::ModuleWireBytes GetFirstArgumentAsBytes(
const v8::FunctionCallbackInfo<v8::Value>& args, ErrorThrower* thrower,
bool* is_shared) {
const uint8_t* start = nullptr;
size_t length = 0;
v8::Local<v8::Value> source = args[0];
if (source->IsArrayBuffer()) {
// A raw array buffer was passed.
Local<ArrayBuffer> buffer = Local<ArrayBuffer>::Cast(source);
ArrayBuffer::Contents contents = buffer->GetContents();
start = reinterpret_cast<const uint8_t*>(contents.Data());
length = contents.ByteLength();
*is_shared = buffer->IsSharedArrayBuffer();
} else if (source->IsTypedArray()) {
// A TypedArray was passed.
Local<TypedArray> array = Local<TypedArray>::Cast(source);
Local<ArrayBuffer> buffer = array->Buffer();
ArrayBuffer::Contents contents = buffer->GetContents();
start =
reinterpret_cast<const uint8_t*>(contents.Data()) + array->ByteOffset();
length = array->ByteLength();
*is_shared = buffer->IsSharedArrayBuffer();
} else {
thrower->TypeError("Argument 0 must be a buffer source");
}
DCHECK_IMPLIES(length, start != nullptr);
if (length == 0) {
thrower->CompileError("BufferSource argument is empty");
}
if (length > i::wasm::kV8MaxWasmModuleSize) {
thrower->RangeError("buffer source exceeds maximum size of %zu (is %zu)",
i::wasm::kV8MaxWasmModuleSize, length);
}
if (thrower->error()) return i::wasm::ModuleWireBytes(nullptr, nullptr);
return i::wasm::ModuleWireBytes(start, start + length);
}
i::MaybeHandle<i::JSReceiver> GetValueAsImports(Local<Value> arg,
ErrorThrower* thrower) {
if (arg->IsUndefined()) return {};
if (!arg->IsObject()) {
thrower->TypeError("Argument 1 must be an object");
return {};
}
Local<Object> obj = Local<Object>::Cast(arg);
return i::Handle<i::JSReceiver>::cast(v8::Utils::OpenHandle(*obj));
}
namespace {
// This class resolves the result of WebAssembly.compile. It just places the
// compilation result in the supplied {promise}.
class AsyncCompilationResolver : public i::wasm::CompilationResultResolver {
public:
AsyncCompilationResolver(i::Isolate* isolate, i::Handle<i::JSPromise> promise)
: promise_(isolate->global_handles()->Create(*promise)) {
i::GlobalHandles::AnnotateStrongRetainer(promise_.location(),
kGlobalPromiseHandle);
}
~AsyncCompilationResolver() override {
i::GlobalHandles::Destroy(promise_.location());
}
void OnCompilationSucceeded(i::Handle<i::WasmModuleObject> result) override {
if (finished_) return;
finished_ = true;
i::MaybeHandle<i::Object> promise_result =
i::JSPromise::Resolve(promise_, result);
CHECK_EQ(promise_result.is_null(),
promise_->GetIsolate()->has_pending_exception());
}
void OnCompilationFailed(i::Handle<i::Object> error_reason) override {
if (finished_) return;
finished_ = true;
i::MaybeHandle<i::Object> promise_result =
i::JSPromise::Reject(promise_, error_reason);
CHECK_EQ(promise_result.is_null(),
promise_->GetIsolate()->has_pending_exception());
}
private:
static constexpr char kGlobalPromiseHandle[] =
"AsyncCompilationResolver::promise_";
bool finished_ = false;
i::Handle<i::JSPromise> promise_;
};
constexpr char AsyncCompilationResolver::kGlobalPromiseHandle[];
// This class resolves the result of WebAssembly.instantiate(module, imports).
// It just places the instantiation result in the supplied {promise}.
class InstantiateModuleResultResolver
: public i::wasm::InstantiationResultResolver {
public:
InstantiateModuleResultResolver(i::Isolate* isolate,
i::Handle<i::JSPromise> promise)
: promise_(isolate->global_handles()->Create(*promise)) {
i::GlobalHandles::AnnotateStrongRetainer(promise_.location(),
kGlobalPromiseHandle);
}
~InstantiateModuleResultResolver() override {
i::GlobalHandles::Destroy(promise_.location());
}
void OnInstantiationSucceeded(
i::Handle<i::WasmInstanceObject> instance) override {
i::MaybeHandle<i::Object> promise_result =
i::JSPromise::Resolve(promise_, instance);
CHECK_EQ(promise_result.is_null(),
promise_->GetIsolate()->has_pending_exception());
}
void OnInstantiationFailed(i::Handle<i::Object> error_reason) override {
i::MaybeHandle<i::Object> promise_result =
i::JSPromise::Reject(promise_, error_reason);
CHECK_EQ(promise_result.is_null(),
promise_->GetIsolate()->has_pending_exception());
}
private:
static constexpr char kGlobalPromiseHandle[] =
"InstantiateModuleResultResolver::promise_";
i::Handle<i::JSPromise> promise_;
};
constexpr char InstantiateModuleResultResolver::kGlobalPromiseHandle[];
// This class resolves the result of WebAssembly.instantiate(bytes, imports).
// For that it creates a new {JSObject} which contains both the provided
// {WasmModuleObject} and the resulting {WebAssemblyInstanceObject} itself.
class InstantiateBytesResultResolver
: public i::wasm::InstantiationResultResolver {
public:
InstantiateBytesResultResolver(i::Isolate* isolate,
i::Handle<i::JSPromise> promise,
i::Handle<i::WasmModuleObject> module)
: isolate_(isolate),
promise_(isolate_->global_handles()->Create(*promise)),
module_(isolate_->global_handles()->Create(*module)) {
i::GlobalHandles::AnnotateStrongRetainer(promise_.location(),
kGlobalPromiseHandle);
i::GlobalHandles::AnnotateStrongRetainer(module_.location(),
kGlobalModuleHandle);
}
~InstantiateBytesResultResolver() override {
i::GlobalHandles::Destroy(promise_.location());
i::GlobalHandles::Destroy(module_.location());
}
void OnInstantiationSucceeded(
i::Handle<i::WasmInstanceObject> instance) override {
// The result is a JSObject with 2 fields which contain the
// WasmInstanceObject and the WasmModuleObject.
i::Handle<i::JSObject> result =
isolate_->factory()->NewJSObject(isolate_->object_function());
i::Handle<i::String> instance_name =
isolate_->factory()
->NewStringFromOneByte(i::StaticCharVector("instance"))
.ToHandleChecked();
i::Handle<i::String> module_name =
isolate_->factory()
->NewStringFromOneByte(i::StaticCharVector("module"))
.ToHandleChecked();
i::JSObject::AddProperty(isolate_, result, instance_name, instance,
i::NONE);
i::JSObject::AddProperty(isolate_, result, module_name, module_, i::NONE);
i::MaybeHandle<i::Object> promise_result =
i::JSPromise::Resolve(promise_, result);
CHECK_EQ(promise_result.is_null(), isolate_->has_pending_exception());
}
void OnInstantiationFailed(i::Handle<i::Object> error_reason) override {
i::MaybeHandle<i::Object> promise_result =
i::JSPromise::Reject(promise_, error_reason);
CHECK_EQ(promise_result.is_null(), isolate_->has_pending_exception());
}
private:
static constexpr char kGlobalPromiseHandle[] =
"InstantiateBytesResultResolver::promise_";
static constexpr char kGlobalModuleHandle[] =
"InstantiateBytesResultResolver::module_";
i::Isolate* isolate_;
i::Handle<i::JSPromise> promise_;
i::Handle<i::WasmModuleObject> module_;
};
constexpr char InstantiateBytesResultResolver::kGlobalPromiseHandle[];
constexpr char InstantiateBytesResultResolver::kGlobalModuleHandle[];
// This class is the {CompilationResultResolver} for
// WebAssembly.instantiate(bytes, imports). When compilation finishes,
// {AsyncInstantiate} is started on the compilation result.
class AsyncInstantiateCompileResultResolver
: public i::wasm::CompilationResultResolver {
public:
AsyncInstantiateCompileResultResolver(
i::Isolate* isolate, i::Handle<i::JSPromise> promise,
i::MaybeHandle<i::JSReceiver> maybe_imports)
: isolate_(isolate),
promise_(isolate_->global_handles()->Create(*promise)),
maybe_imports_(maybe_imports.is_null()
? maybe_imports
: isolate_->global_handles()->Create(
*maybe_imports.ToHandleChecked())) {
i::GlobalHandles::AnnotateStrongRetainer(promise_.location(),
kGlobalPromiseHandle);
if (!maybe_imports_.is_null()) {
i::GlobalHandles::AnnotateStrongRetainer(
maybe_imports_.ToHandleChecked().location(), kGlobalImportsHandle);
}
}
~AsyncInstantiateCompileResultResolver() override {
i::GlobalHandles::Destroy(promise_.location());
if (!maybe_imports_.is_null()) {
i::GlobalHandles::Destroy(maybe_imports_.ToHandleChecked().location());
}
}
void OnCompilationSucceeded(i::Handle<i::WasmModuleObject> result) override {
if (finished_) return;
finished_ = true;
isolate_->wasm_engine()->AsyncInstantiate(
isolate_,
base::make_unique<InstantiateBytesResultResolver>(isolate_, promise_,
result),
result, maybe_imports_);
}
void OnCompilationFailed(i::Handle<i::Object> error_reason) override {
if (finished_) return;
finished_ = true;
i::MaybeHandle<i::Object> promise_result =
i::JSPromise::Reject(promise_, error_reason);
CHECK_EQ(promise_result.is_null(), isolate_->has_pending_exception());
}
private:
static constexpr char kGlobalPromiseHandle[] =
"AsyncInstantiateCompileResultResolver::promise_";
static constexpr char kGlobalImportsHandle[] =
"AsyncInstantiateCompileResultResolver::module_";
bool finished_ = false;
i::Isolate* isolate_;
i::Handle<i::JSPromise> promise_;
i::MaybeHandle<i::JSReceiver> maybe_imports_;
};
constexpr char AsyncInstantiateCompileResultResolver::kGlobalPromiseHandle[];
constexpr char AsyncInstantiateCompileResultResolver::kGlobalImportsHandle[];
std::string ToString(const char* name) { return std::string(name); }
std::string ToString(const i::Handle<i::String> name) {
return std::string("Property '") + name->ToCString().get() + "'";
}
// Web IDL: '[EnforceRange] unsigned long'
// Previously called ToNonWrappingUint32 in the draft WebAssembly JS spec.
// https://heycam.github.io/webidl/#EnforceRange
template <typename T>
bool EnforceUint32(T argument_name, Local<v8::Value> v, Local<Context> context,
ErrorThrower* thrower, uint32_t* res) {
double double_number;
if (!v->NumberValue(context).To(&double_number)) {
thrower->TypeError("%s must be convertible to a number",
ToString(argument_name).c_str());
return false;
}
if (!std::isfinite(double_number)) {
thrower->TypeError("%s must be convertible to a valid number",
ToString(argument_name).c_str());
return false;
}
if (double_number < 0) {
thrower->TypeError("%s must be non-negative",
ToString(argument_name).c_str());
return false;
}
if (double_number > std::numeric_limits<uint32_t>::max()) {
thrower->TypeError("%s must be in the unsigned long range",
ToString(argument_name).c_str());
return false;
}
*res = static_cast<uint32_t>(double_number);
return true;
}
} // namespace
// WebAssembly.compile(bytes) -> Promise
void WebAssemblyCompile(const v8::FunctionCallbackInfo<v8::Value>& args) {
constexpr const char* kAPIMethodName = "WebAssembly.compile()";
v8::Isolate* isolate = args.GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
HandleScope scope(isolate);
ScheduledErrorThrower thrower(i_isolate, kAPIMethodName);
if (!i::wasm::IsWasmCodegenAllowed(i_isolate, i_isolate->native_context())) {
thrower.CompileError("Wasm code generation disallowed by embedder");
}
Local<Context> context = isolate->GetCurrentContext();
ASSIGN(Promise::Resolver, promise_resolver, Promise::Resolver::New(context));
Local<Promise> promise = promise_resolver->GetPromise();
v8::ReturnValue<v8::Value> return_value = args.GetReturnValue();
return_value.Set(promise);
std::shared_ptr<i::wasm::CompilationResultResolver> resolver(
new AsyncCompilationResolver(i_isolate, Utils::OpenHandle(*promise)));
bool is_shared = false;
auto bytes = GetFirstArgumentAsBytes(args, &thrower, &is_shared);
if (thrower.error()) {
resolver->OnCompilationFailed(thrower.Reify());
return;
}
// Asynchronous compilation handles copying wire bytes if necessary.
auto enabled_features = i::wasm::WasmFeaturesFromIsolate(i_isolate);
i_isolate->wasm_engine()->AsyncCompile(i_isolate, enabled_features,
std::move(resolver), bytes, is_shared,
kAPIMethodName);
}
void WasmStreamingCallbackForTesting(
const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
HandleScope scope(isolate);
ScheduledErrorThrower thrower(i_isolate, "WebAssembly.compile()");
std::shared_ptr<v8::WasmStreaming> streaming =
v8::WasmStreaming::Unpack(args.GetIsolate(), args.Data());
bool is_shared = false;
i::wasm::ModuleWireBytes bytes =
GetFirstArgumentAsBytes(args, &thrower, &is_shared);
if (thrower.error()) {
streaming->Abort(Utils::ToLocal(thrower.Reify()));
return;
}
streaming->OnBytesReceived(bytes.start(), bytes.length());
streaming->Finish();
CHECK(!thrower.error());
}
void WasmStreamingPromiseFailedCallback(
const v8::FunctionCallbackInfo<v8::Value>& args) {
std::shared_ptr<v8::WasmStreaming> streaming =
v8::WasmStreaming::Unpack(args.GetIsolate(), args.Data());
streaming->Abort(args[0]);
}
// WebAssembly.compileStreaming(Promise<Response>) -> Promise
void WebAssemblyCompileStreaming(
const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
HandleScope scope(isolate);
const char* const kAPIMethodName = "WebAssembly.compileStreaming()";
ScheduledErrorThrower thrower(i_isolate, kAPIMethodName);
Local<Context> context = isolate->GetCurrentContext();
// Create and assign the return value of this function.
ASSIGN(Promise::Resolver, result_resolver, Promise::Resolver::New(context));
Local<Promise> promise = result_resolver->GetPromise();
v8::ReturnValue<v8::Value> return_value = args.GetReturnValue();
return_value.Set(promise);
// Prepare the CompilationResultResolver for the compilation.
auto resolver = std::make_shared<AsyncCompilationResolver>(
i_isolate, Utils::OpenHandle(*promise));
if (!i::wasm::IsWasmCodegenAllowed(i_isolate, i_isolate->native_context())) {
thrower.CompileError("Wasm code generation disallowed by embedder");
resolver->OnCompilationFailed(thrower.Reify());
return;
}
// Allocate the streaming decoder in a Managed so we can pass it to the
// embedder.
i::Handle<i::Managed<WasmStreaming>> data =
i::Managed<WasmStreaming>::Allocate(
i_isolate, 0,
base::make_unique<WasmStreaming::WasmStreamingImpl>(
isolate, kAPIMethodName, resolver));
DCHECK_NOT_NULL(i_isolate->wasm_streaming_callback());
ASSIGN(
v8::Function, compile_callback,
v8::Function::New(context, i_isolate->wasm_streaming_callback(),
Utils::ToLocal(i::Handle<i::Object>::cast(data)), 1));
ASSIGN(
v8::Function, reject_callback,
v8::Function::New(context, WasmStreamingPromiseFailedCallback,
Utils::ToLocal(i::Handle<i::Object>::cast(data)), 1));
// The parameter may be of type {Response} or of type {Promise<Response>}.
// Treat either case of parameter as Promise.resolve(parameter)
// as per https://www.w3.org/2001/tag/doc/promises-guide#resolve-arguments
// Ending with:
// return Promise.resolve(parameter).then(compile_callback);
ASSIGN(Promise::Resolver, input_resolver, Promise::Resolver::New(context));
if (!input_resolver->Resolve(context, args[0]).IsJust()) return;
// We do not have any use of the result here. The {compile_callback} will
// start streaming compilation, which will eventually resolve the promise we
// set as result value.
USE(input_resolver->GetPromise()->Then(context, compile_callback,
reject_callback));
}
// WebAssembly.validate(bytes) -> bool
void WebAssemblyValidate(const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
HandleScope scope(isolate);
ScheduledErrorThrower thrower(i_isolate, "WebAssembly.validate()");
bool is_shared = false;
auto bytes = GetFirstArgumentAsBytes(args, &thrower, &is_shared);
v8::ReturnValue<v8::Value> return_value = args.GetReturnValue();
if (thrower.error()) {
if (thrower.wasm_error()) thrower.Reset(); // Clear error.
return_value.Set(v8::False(isolate));
return;
}
auto enabled_features = i::wasm::WasmFeaturesFromIsolate(i_isolate);
bool validated = false;
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());
validated = i_isolate->wasm_engine()->SyncValidate(
i_isolate, enabled_features, bytes_copy);
} else {
// The wire bytes are not shared, OK to use them directly.
validated = i_isolate->wasm_engine()->SyncValidate(i_isolate,
enabled_features, bytes);
}
return_value.Set(Boolean::New(isolate, validated));
}
// new WebAssembly.Module(bytes) -> WebAssembly.Module
void WebAssemblyModule(const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
if (i_isolate->wasm_module_callback()(args)) return;
HandleScope scope(isolate);
ScheduledErrorThrower thrower(i_isolate, "WebAssembly.Module()");
if (!args.IsConstructCall()) {
thrower.TypeError("WebAssembly.Module must be invoked with 'new'");
return;
}
if (!i::wasm::IsWasmCodegenAllowed(i_isolate, i_isolate->native_context())) {
thrower.CompileError("Wasm code generation disallowed by embedder");
return;
}
bool is_shared = false;
auto bytes = GetFirstArgumentAsBytes(args, &thrower, &is_shared);
if (thrower.error()) {
return;
}
auto enabled_features = i::wasm::WasmFeaturesFromIsolate(i_isolate);
i::MaybeHandle<i::Object> module_obj;
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_obj = i_isolate->wasm_engine()->SyncCompile(
i_isolate, enabled_features, &thrower, bytes_copy);
} else {
// The wire bytes are not shared, OK to use them directly.
module_obj = i_isolate->wasm_engine()->SyncCompile(
i_isolate, enabled_features, &thrower, bytes);
}
if (module_obj.is_null()) return;
v8::ReturnValue<v8::Value> return_value = args.GetReturnValue();
return_value.Set(Utils::ToLocal(module_obj.ToHandleChecked()));
}
// WebAssembly.Module.imports(module) -> Array<Import>
void WebAssemblyModuleImports(const v8::FunctionCallbackInfo<v8::Value>& args) {
HandleScope scope(args.GetIsolate());
v8::Isolate* isolate = args.GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
ScheduledErrorThrower thrower(i_isolate, "WebAssembly.Module.imports()");
auto maybe_module = GetFirstArgumentAsModule(args, &thrower);
if (thrower.error()) return;
auto imports = i::wasm::GetImports(i_isolate, maybe_module.ToHandleChecked());
args.GetReturnValue().Set(Utils::ToLocal(imports));
}
// WebAssembly.Module.exports(module) -> Array<Export>
void WebAssemblyModuleExports(const v8::FunctionCallbackInfo<v8::Value>& args) {
HandleScope scope(args.GetIsolate());
v8::Isolate* isolate = args.GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
ScheduledErrorThrower thrower(i_isolate, "WebAssembly.Module.exports()");
auto maybe_module = GetFirstArgumentAsModule(args, &thrower);
if (thrower.error()) return;
auto exports = i::wasm::GetExports(i_isolate, maybe_module.ToHandleChecked());
args.GetReturnValue().Set(Utils::ToLocal(exports));
}
// WebAssembly.Module.customSections(module, name) -> Array<Section>
void WebAssemblyModuleCustomSections(
const v8::FunctionCallbackInfo<v8::Value>& args) {
HandleScope scope(args.GetIsolate());
v8::Isolate* isolate = args.GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
ScheduledErrorThrower thrower(i_isolate,
"WebAssembly.Module.customSections()");
auto maybe_module = GetFirstArgumentAsModule(args, &thrower);
if (thrower.error()) return;
if (args[1]->IsUndefined()) {
thrower.TypeError("Argument 1 is required");
return;
}
i::MaybeHandle<i::Object> maybe_name =
i::Object::ToString(i_isolate, Utils::OpenHandle(*args[1]));
i::Handle<i::Object> name;
if (!maybe_name.ToHandle(&name)) return;
auto custom_sections =
i::wasm::GetCustomSections(i_isolate, maybe_module.ToHandleChecked(),
i::Handle<i::String>::cast(name), &thrower);
if (thrower.error()) return;
args.GetReturnValue().Set(Utils::ToLocal(custom_sections));
}
MaybeLocal<Value> WebAssemblyInstantiateImpl(Isolate* isolate,
Local<Value> module,
Local<Value> ffi) {
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
i::MaybeHandle<i::Object> instance_object;
{
ScheduledErrorThrower thrower(i_isolate, "WebAssembly.Instance()");
// TODO(ahaas): These checks on the module should not be necessary here They
// are just a workaround for https://crbug.com/837417.
i::Handle<i::Object> module_obj = Utils::OpenHandle(*module);
if (!module_obj->IsWasmModuleObject()) {
thrower.TypeError("Argument 0 must be a WebAssembly.Module object");
return {};
}
i::MaybeHandle<i::JSReceiver> maybe_imports =
GetValueAsImports(ffi, &thrower);
if (thrower.error()) return {};
instance_object = i_isolate->wasm_engine()->SyncInstantiate(
i_isolate, &thrower, i::Handle<i::WasmModuleObject>::cast(module_obj),
maybe_imports, i::MaybeHandle<i::JSArrayBuffer>());
}
DCHECK_EQ(instance_object.is_null(), i_isolate->has_scheduled_exception());
if (instance_object.is_null()) return {};
return Utils::ToLocal(instance_object.ToHandleChecked());
}
// new WebAssembly.Instance(module, imports) -> WebAssembly.Instance
void WebAssemblyInstance(const v8::FunctionCallbackInfo<v8::Value>& args) {
Isolate* isolate = args.GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
i_isolate->CountUsage(
v8::Isolate::UseCounterFeature::kWebAssemblyInstantiation);
HandleScope scope(args.GetIsolate());
if (i_isolate->wasm_instance_callback()(args)) return;
ScheduledErrorThrower thrower(i_isolate, "WebAssembly.Instance()");
if (!args.IsConstructCall()) {
thrower.TypeError("WebAssembly.Instance must be invoked with 'new'");
return;
}
GetFirstArgumentAsModule(args, &thrower);
if (thrower.error()) return;
// If args.Length < 2, this will be undefined - see FunctionCallbackInfo.
// We'll check for that in WebAssemblyInstantiateImpl.
Local<Value> data = args[1];
Local<Value> instance;
if (WebAssemblyInstantiateImpl(isolate, args[0], data).ToLocal(&instance)) {
args.GetReturnValue().Set(instance);
}
}
void WebAssemblyInstantiateStreaming(
const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
i_isolate->CountUsage(
v8::Isolate::UseCounterFeature::kWebAssemblyInstantiation);
HandleScope scope(isolate);
Local<Context> context = isolate->GetCurrentContext();
const char* const kAPIMethodName = "WebAssembly.instantiateStreaming()";
ScheduledErrorThrower thrower(i_isolate, kAPIMethodName);
// Create and assign the return value of this function.
ASSIGN(Promise::Resolver, result_resolver, Promise::Resolver::New(context));
Local<Promise> promise = result_resolver->GetPromise();
v8::ReturnValue<v8::Value> return_value = args.GetReturnValue();
return_value.Set(promise);
// Create an InstantiateResultResolver in case there is an issue with the
// passed parameters.
std::unique_ptr<i::wasm::InstantiationResultResolver> resolver(
new InstantiateModuleResultResolver(i_isolate,
Utils::OpenHandle(*promise)));
if (!i::wasm::IsWasmCodegenAllowed(i_isolate, i_isolate->native_context())) {
thrower.CompileError("Wasm code generation disallowed by embedder");
resolver->OnInstantiationFailed(thrower.Reify());
return;
}
// If args.Length < 2, this will be undefined - see FunctionCallbackInfo.
Local<Value> ffi = args[1];
i::MaybeHandle<i::JSReceiver> maybe_imports =
GetValueAsImports(ffi, &thrower);
if (thrower.error()) {
resolver->OnInstantiationFailed(thrower.Reify());
return;
}
// We start compilation now, we have no use for the
// {InstantiationResultResolver}.
resolver.reset();
std::shared_ptr<i::wasm::CompilationResultResolver> compilation_resolver(
new AsyncInstantiateCompileResultResolver(
i_isolate, Utils::OpenHandle(*promise), maybe_imports));
// Allocate the streaming decoder in a Managed so we can pass it to the
// embedder.
i::Handle<i::Managed<WasmStreaming>> data =
i::Managed<WasmStreaming>::Allocate(
i_isolate, 0,
base::make_unique<WasmStreaming::WasmStreamingImpl>(
isolate, kAPIMethodName, compilation_resolver));
DCHECK_NOT_NULL(i_isolate->wasm_streaming_callback());
ASSIGN(
v8::Function, compile_callback,
v8::Function::New(context, i_isolate->wasm_streaming_callback(),
Utils::ToLocal(i::Handle<i::Object>::cast(data)), 1));
ASSIGN(
v8::Function, reject_callback,
v8::Function::New(context, WasmStreamingPromiseFailedCallback,
Utils::ToLocal(i::Handle<i::Object>::cast(data)), 1));
// The parameter may be of type {Response} or of type {Promise<Response>}.
// Treat either case of parameter as Promise.resolve(parameter)
// as per https://www.w3.org/2001/tag/doc/promises-guide#resolve-arguments
// Ending with:
// return Promise.resolve(parameter).then(compile_callback);
ASSIGN(Promise::Resolver, input_resolver, Promise::Resolver::New(context));
if (!input_resolver->Resolve(context, args[0]).IsJust()) return;
// We do not have any use of the result here. The {compile_callback} will
// start streaming compilation, which will eventually resolve the promise we
// set as result value.
USE(input_resolver->GetPromise()->Then(context, compile_callback,
reject_callback));
}
// WebAssembly.instantiate(module, imports) -> WebAssembly.Instance
// WebAssembly.instantiate(bytes, imports) ->
// {module: WebAssembly.Module, instance: WebAssembly.Instance}
void WebAssemblyInstantiate(const v8::FunctionCallbackInfo<v8::Value>& args) {
constexpr const char* kAPIMethodName = "WebAssembly.instantiate()";
v8::Isolate* isolate = args.GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
i_isolate->CountUsage(
v8::Isolate::UseCounterFeature::kWebAssemblyInstantiation);
ScheduledErrorThrower thrower(i_isolate, kAPIMethodName);
HandleScope scope(isolate);
Local<Context> context = isolate->GetCurrentContext();
ASSIGN(Promise::Resolver, promise_resolver, Promise::Resolver::New(context));
Local<Promise> promise = promise_resolver->GetPromise();
args.GetReturnValue().Set(promise);
std::unique_ptr<i::wasm::InstantiationResultResolver> resolver(
new InstantiateModuleResultResolver(i_isolate,
Utils::OpenHandle(*promise)));
Local<Value> first_arg_value = args[0];
i::Handle<i::Object> first_arg = Utils::OpenHandle(*first_arg_value);
if (!first_arg->IsJSObject()) {
thrower.TypeError(
"Argument 0 must be a buffer source or a WebAssembly.Module object");
resolver->OnInstantiationFailed(thrower.Reify());
return;
}
// If args.Length < 2, this will be undefined - see FunctionCallbackInfo.
Local<Value> ffi = args[1];
i::MaybeHandle<i::JSReceiver> maybe_imports =
GetValueAsImports(ffi, &thrower);
if (thrower.error()) {
resolver->OnInstantiationFailed(thrower.Reify());
return;
}
if (first_arg->IsWasmModuleObject()) {
i::Handle<i::WasmModuleObject> module_obj =
i::Handle<i::WasmModuleObject>::cast(first_arg);
i_isolate->wasm_engine()->AsyncInstantiate(i_isolate, std::move(resolver),
module_obj, maybe_imports);
return;
}
bool is_shared = false;
auto bytes = GetFirstArgumentAsBytes(args, &thrower, &is_shared);
if (thrower.error()) {
resolver->OnInstantiationFailed(thrower.Reify());
return;
}
// We start compilation now, we have no use for the
// {InstantiationResultResolver}.
resolver.reset();
std::shared_ptr<i::wasm::CompilationResultResolver> compilation_resolver(
new AsyncInstantiateCompileResultResolver(
i_isolate, Utils::OpenHandle(*promise), maybe_imports));
// The first parameter is a buffer source, we have to check if we are allowed
// to compile it.
if (!i::wasm::IsWasmCodegenAllowed(i_isolate, i_isolate->native_context())) {
thrower.CompileError("Wasm code generation disallowed by embedder");
compilation_resolver->OnCompilationFailed(thrower.Reify());
return;
}
// Asynchronous compilation handles copying wire bytes if necessary.
auto enabled_features = i::wasm::WasmFeaturesFromIsolate(i_isolate);
i_isolate->wasm_engine()->AsyncCompile(i_isolate, enabled_features,
std::move(compilation_resolver), bytes,
is_shared, kAPIMethodName);
}
bool GetIntegerProperty(v8::Isolate* isolate, ErrorThrower* thrower,
Local<Context> context, v8::Local<v8::Value> value,
i::Handle<i::String> property_name, int64_t* result,
int64_t lower_bound, uint64_t upper_bound) {
uint32_t number;
if (!EnforceUint32(property_name, value, context, thrower, &number)) {
return false;
}
if (number < lower_bound) {
thrower->RangeError("Property '%s': value %" PRIu32
" is below the lower bound %" PRIx64,
property_name->ToCString().get(), number, lower_bound);
return false;
}
if (number > upper_bound) {
thrower->RangeError("Property '%s': value %" PRIu32
" is above the upper bound %" PRIu64,
property_name->ToCString().get(), number, upper_bound);
return false;
}
*result = static_cast<int64_t>(number);
return true;
}
bool GetOptionalIntegerProperty(v8::Isolate* isolate, ErrorThrower* thrower,
Local<Context> context,
Local<v8::Object> object,
Local<String> property, bool* has_property,
int64_t* result, int64_t lower_bound,
uint64_t upper_bound) {
v8::Local<v8::Value> value;
if (!object->Get(context, property).ToLocal(&value)) {
return false;
}
// Web IDL: dictionary presence
// https://heycam.github.io/webidl/#dfn-present
if (value->IsUndefined()) {
if (has_property != nullptr) *has_property = false;
return true;
}
if (has_property != nullptr) *has_property = true;
i::Handle<i::String> property_name = v8::Utils::OpenHandle(*property);
return GetIntegerProperty(isolate, thrower, context, value, property_name,
result, lower_bound, upper_bound);
}
// Fetch 'initial' or 'minimum' property from object. If both are provided,
// 'initial' is used.
// TODO(aseemgarg): change behavior when the following bug is resolved:
// https://github.com/WebAssembly/js-types/issues/6
bool GetInitialOrMinimumProperty(v8::Isolate* isolate, ErrorThrower* thrower,
Local<Context> context,
Local<v8::Object> object, int64_t* result,
int64_t lower_bound, uint64_t upper_bound) {
bool has_initial = false;
if (!GetOptionalIntegerProperty(isolate, thrower, context, object,
v8_str(isolate, "initial"), &has_initial,
result, lower_bound, upper_bound)) {
return false;
}
auto enabled_features = i::wasm::WasmFeaturesFromFlags();
if (!has_initial && enabled_features.type_reflection) {
if (!GetOptionalIntegerProperty(isolate, thrower, context, object,
v8_str(isolate, "minimum"), &has_initial,
result, lower_bound, upper_bound)) {
return false;
}
}
if (!has_initial) {
// TODO(aseemgarg): update error message when the spec issue is resolved.
thrower->TypeError("Property 'initial' is required");
return false;
}
return true;
}
// new WebAssembly.Table(args) -> WebAssembly.Table
void WebAssemblyTable(const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
HandleScope scope(isolate);
ScheduledErrorThrower thrower(i_isolate, "WebAssembly.Module()");
if (!args.IsConstructCall()) {
thrower.TypeError("WebAssembly.Table must be invoked with 'new'");
return;
}
if (!args[0]->IsObject()) {
thrower.TypeError("Argument 0 must be a table descriptor");
return;
}
Local<Context> context = isolate->GetCurrentContext();
Local<v8::Object> descriptor = Local<Object>::Cast(args[0]);
i::wasm::ValueType type;
// The descriptor's 'element'.
{
v8::MaybeLocal<v8::Value> maybe =
descriptor->Get(context, v8_str(isolate, "element"));
v8::Local<v8::Value> value;
if (!maybe.ToLocal(&value)) return;
v8::Local<v8::String> string;
if (!value->ToString(context).ToLocal(&string)) return;
auto enabled_features = i::wasm::WasmFeaturesFromFlags();
if (string->StringEquals(v8_str(isolate, "anyfunc"))) {
type = i::wasm::kWasmAnyFunc;
} else if (enabled_features.anyref &&
string->StringEquals(v8_str(isolate, "anyref"))) {
type = i::wasm::kWasmAnyRef;
} else {
thrower.TypeError("Descriptor property 'element' must be 'anyfunc'");
return;
}
}
int64_t initial = 0;
if (!GetInitialOrMinimumProperty(isolate, &thrower, context, descriptor,
&initial, 0,
i::wasm::max_table_init_entries())) {
return;
}
// The descriptor's 'maximum'.
int64_t maximum = -1;
bool has_maximum = true;
if (!GetOptionalIntegerProperty(
isolate, &thrower, context, descriptor, v8_str(isolate, "maximum"),
&has_maximum, &maximum, initial, i::wasm::max_table_init_entries())) {
return;
}
i::Handle<i::FixedArray> fixed_array;
i::Handle<i::JSObject> table_obj = i::WasmTableObject::New(
i_isolate, type, static_cast<uint32_t>(initial), has_maximum,
static_cast<uint32_t>(maximum), &fixed_array);
v8::ReturnValue<v8::Value> return_value = args.GetReturnValue();
return_value.Set(Utils::ToLocal(table_obj));
}
void WebAssemblyMemory(const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
HandleScope scope(isolate);
ScheduledErrorThrower thrower(i_isolate, "WebAssembly.Memory()");
if (!args.IsConstructCall()) {
thrower.TypeError("WebAssembly.Memory must be invoked with 'new'");
return;
}
if (!args[0]->IsObject()) {
thrower.TypeError("Argument 0 must be a memory descriptor");
return;
}
Local<Context> context = isolate->GetCurrentContext();
Local<v8::Object> descriptor = Local<Object>::Cast(args[0]);
int64_t initial = 0;
if (!GetInitialOrMinimumProperty(isolate, &thrower, context, descriptor,
&initial, 0, i::wasm::max_mem_pages())) {
return;
}
// The descriptor's 'maximum'.
int64_t maximum = -1;
if (!GetOptionalIntegerProperty(isolate, &thrower, context, descriptor,
v8_str(isolate, "maximum"), nullptr, &maximum,
initial, i::wasm::kSpecMaxWasmMemoryPages)) {
return;
}
bool is_shared_memory = false;
auto enabled_features = i::wasm::WasmFeaturesFromIsolate(i_isolate);
if (enabled_features.threads) {
// Shared property of descriptor
Local<String> shared_key = v8_str(isolate, "shared");
v8::MaybeLocal<v8::Value> maybe_value =
descriptor->Get(context, shared_key);
v8::Local<v8::Value> value;
if (maybe_value.ToLocal(&value)) {
is_shared_memory = value->BooleanValue(isolate);
}
// Throw TypeError if shared is true, and the descriptor has no "maximum"
if (is_shared_memory && maximum == -1) {
thrower.TypeError(
"If shared is true, maximum property should be defined.");
return;
}
}
i::Handle<i::JSObject> memory_obj;
if (!i::WasmMemoryObject::New(i_isolate, static_cast<uint32_t>(initial),
static_cast<uint32_t>(maximum),
is_shared_memory)
.ToHandle(&memory_obj)) {
thrower.RangeError("could not allocate memory");
return;
}
if (is_shared_memory) {
i::Handle<i::JSArrayBuffer> buffer(
i::Handle<i::WasmMemoryObject>::cast(memory_obj)->array_buffer(),
i_isolate);
Maybe<bool> result =
buffer->SetIntegrityLevel(buffer, i::FROZEN, i::kDontThrow);
if (!result.FromJust()) {
thrower.TypeError(
"Status of setting SetIntegrityLevel of buffer is false.");
return;
}
}
args.GetReturnValue().Set(Utils::ToLocal(memory_obj));
}
// Determines the type encoded in a value type property (e.g. type reflection).
// Returns false if there was an exception, true upon success. On success the
// outgoing {type} is set accordingly, or set to {wasm::kWasmStmt} in case the
// type could not be properly recognized.
bool GetValueType(Isolate* isolate, MaybeLocal<Value> maybe,
Local<Context> context, i::wasm::ValueType* type,
i::wasm::WasmFeatures enabled_features) {
v8::Local<v8::Value> value;
if (!maybe.ToLocal(&value)) return false;
v8::Local<v8::String> string;
if (!value->ToString(context).ToLocal(&string)) return false;
if (string->StringEquals(v8_str(isolate, "i32"))) {
*type = i::wasm::kWasmI32;
} else if (string->StringEquals(v8_str(isolate, "f32"))) {
*type = i::wasm::kWasmF32;
} else if (string->StringEquals(v8_str(isolate, "i64"))) {
*type = i::wasm::kWasmI64;
} else if (string->StringEquals(v8_str(isolate, "f64"))) {
*type = i::wasm::kWasmF64;
} else if (enabled_features.anyref &&
string->StringEquals(v8_str(isolate, "anyref"))) {
*type = i::wasm::kWasmAnyRef;
} else if (enabled_features.anyref &&
string->StringEquals(v8_str(isolate, "anyfunc"))) {
*type = i::wasm::kWasmAnyFunc;
} else {
// Unrecognized type.
*type = i::wasm::kWasmStmt;
}
return true;
}
// WebAssembly.Global
void WebAssemblyGlobal(const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
HandleScope scope(isolate);
ScheduledErrorThrower thrower(i_isolate, "WebAssembly.Global()");
if (!args.IsConstructCall()) {
thrower.TypeError("WebAssembly.Global must be invoked with 'new'");
return;
}
if (!args[0]->IsObject()) {
thrower.TypeError("Argument 0 must be a global descriptor");
return;
}
Local<Context> context = isolate->GetCurrentContext();
Local<v8::Object> descriptor = Local<Object>::Cast(args[0]);
auto enabled_features = i::wasm::WasmFeaturesFromIsolate(i_isolate);
// The descriptor's 'mutable'.
bool is_mutable = false;
{
Local<String> mutable_key = v8_str(isolate, "mutable");
v8::MaybeLocal<v8::Value> maybe = descriptor->Get(context, mutable_key);
v8::Local<v8::Value> value;
if (maybe.ToLocal(&value)) {
is_mutable = value->BooleanValue(isolate);
}
}
// The descriptor's type, called 'value'. It is called 'value' because this
// descriptor is planned to be re-used as the global's type for reflection,
// so calling it 'type' is redundant.
i::wasm::ValueType type;
{
v8::MaybeLocal<v8::Value> maybe =
descriptor->Get(context, v8_str(isolate, "value"));
if (!GetValueType(isolate, maybe, context, &type, enabled_features)) return;
if (type == i::wasm::kWasmStmt) {
thrower.TypeError(
"Descriptor property 'value' must be 'i32', 'i64', 'f32', or "
"'f64'");
return;
}
}
const uint32_t offset = 0;
i::MaybeHandle<i::WasmGlobalObject> maybe_global_obj =
i::WasmGlobalObject::New(i_isolate, i::MaybeHandle<i::JSArrayBuffer>(),
i::MaybeHandle<i::FixedArray>(), type, offset,
is_mutable);
i::Handle<i::WasmGlobalObject> global_obj;
if (!maybe_global_obj.ToHandle(&global_obj)) {
thrower.RangeError("could not allocate memory");
return;
}
// Convert value to a WebAssembly value, the default value is 0.
Local<v8::Value> value = Local<Value>::Cast(args[1]);
switch (type) {
case i::wasm::kWasmI32: {
int32_t i32_value = 0;
if (!value->IsUndefined()) {
v8::Local<v8::Int32> int32_value;
if (!value->ToInt32(context).ToLocal(&int32_value)) return;
if (!int32_value->Int32Value(context).To(&i32_value)) return;
}
global_obj->SetI32(i32_value);
break;
}
case i::wasm::kWasmI64: {
int64_t i64_value = 0;
if (!value->IsUndefined()) {
if (!enabled_features.bigint) {
thrower.TypeError("Can't set the value of i64 WebAssembly.Global");
return;
}
v8::Local<v8::BigInt> bigint_value;
if (!value->ToBigInt(context).ToLocal(&bigint_value)) return;
i64_value = bigint_value->Int64Value();
}
global_obj->SetI64(i64_value);
break;
}
case i::wasm::kWasmF32: {
float f32_value = 0;
if (!value->IsUndefined()) {
double f64_value = 0;
v8::Local<v8::Number> number_value;
if (!value->ToNumber(context).ToLocal(&number_value)) return;
if (!number_value->NumberValue(context).To(&f64_value)) return;
f32_value = static_cast<float>(f64_value);
}
global_obj->SetF32(f32_value);
break;
}
case i::wasm::kWasmF64: {
double f64_value = 0;
if (!value->IsUndefined()) {
v8::Local<v8::Number> number_value;
if (!value->ToNumber(context).ToLocal(&number_value)) return;
if (!number_value->NumberValue(context).To(&f64_value)) return;
}
global_obj->SetF64(f64_value);
break;
}
case i::wasm::kWasmAnyRef: {
if (args.Length() < 2) {
// When no inital value is provided, we have to use the WebAssembly
// default value 'null', and not the JS default value 'undefined'.
global_obj->SetAnyRef(i_isolate->factory()->null_value());
break;
}
global_obj->SetAnyRef(Utils::OpenHandle(*value));
break;
}
case i::wasm::kWasmAnyFunc: {
if (args.Length() < 2) {
// When no inital value is provided, we have to use the WebAssembly
// default value 'null', and not the JS default value 'undefined'.
global_obj->SetAnyFunc(i_isolate, i_isolate->factory()->null_value());
break;
}
if (!global_obj->SetAnyFunc(i_isolate, Utils::OpenHandle(*value))) {
thrower.TypeError(
"The value of anyfunc globals must be null or an "
"exported function");
}
break;
}
default:
UNREACHABLE();
}
i::Handle<i::JSObject> global_js_object(global_obj);
args.GetReturnValue().Set(Utils::ToLocal(global_js_object));
}
// WebAssembly.Exception
void WebAssemblyException(const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
HandleScope scope(isolate);
ScheduledErrorThrower thrower(i_isolate, "WebAssembly.Exception()");
thrower.TypeError("WebAssembly.Exception cannot be called");
}
// WebAssembly.Function
void WebAssemblyFunction(const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
HandleScope scope(isolate);
ScheduledErrorThrower thrower(i_isolate, "WebAssembly.Function()");
if (!args.IsConstructCall()) {
thrower.TypeError("WebAssembly.Function must be invoked with 'new'");
return;
}
if (!args[0]->IsObject()) {
thrower.TypeError("Argument 0 must be a function type");
return;
}
Local<Object> function_type = Local<Object>::Cast(args[0]);
Local<Context> context = isolate->GetCurrentContext();
auto enabled_features = i::wasm::WasmFeaturesFromIsolate(i_isolate);
// Load the 'parameters' property of the function type.
Local<String> parameters_key = v8_str(isolate, "parameters");
v8::MaybeLocal<v8::Value> parameters_maybe =
function_type->Get(context, parameters_key);
v8::Local<v8::Value> parameters_value;
if (!parameters_maybe.ToLocal(&parameters_value)) return;
// TODO(7742): Allow any iterable, not just {Array} here.
if (!parameters_value->IsArray()) {
thrower.TypeError("Argument 0 must be a function type with 'parameters'");
return;
}
Local<Array> parameters = parameters_value.As<Array>();
uint32_t parameters_len = parameters->Length();
if (parameters_len > i::wasm::kV8MaxWasmFunctionParams) {
thrower.TypeError("Argument 0 contains too many parameters");
return;
}
// Load the 'results' property of the function type.
Local<String> results_key = v8_str(isolate, "results");
v8::MaybeLocal<v8::Value> results_maybe =
function_type->Get(context, results_key);
v8::Local<v8::Value> results_value;
if (!results_maybe.ToLocal(&results_value)) return;
// TODO(7742): Allow any iterable, not just {Array} here.
if (!results_value->IsArray()) {
thrower.TypeError("Argument 0 must be a function type with 'results'");
return;
}
Local<Array> results = results_value.As<Array>();
uint32_t results_len = results->Length();
if (results_len > (enabled_features.mv
? i::wasm::kV8MaxWasmFunctionMultiReturns
: i::wasm::kV8MaxWasmFunctionReturns)) {
thrower.TypeError("Argument 0 contains too many results");
return;
}
// Decode the function type and construct a signature.
i::Zone zone(i_isolate->allocator(), ZONE_NAME);
i::wasm::FunctionSig::Builder builder(&zone, parameters_len, results_len);
for (uint32_t i = 0; i < parameters_len; ++i) {
i::wasm::ValueType type;
MaybeLocal<Value> maybe = parameters->Get(context, i);
if (!GetValueType(isolate, maybe, context, &type, enabled_features)) return;
if (type == i::wasm::kWasmStmt) {
thrower.TypeError(
"Argument 0 parameter type at index #%u must be a value type", i);
return;
}
builder.AddParam(type);
}
for (uint32_t i = 0; i < results_len; ++i) {
i::wasm::ValueType type;
MaybeLocal<Value> maybe = results->Get(context, i);
if (!GetValueType(isolate, maybe, context, &type, enabled_features)) return;
if (type == i::wasm::kWasmStmt) {
thrower.TypeError(
"Argument 0 result type at index #%u must be a value type", i);
return;
}
builder.AddReturn(type);
}
if (!args[1]->IsFunction()) {
thrower.TypeError("Argument 1 must be a function");
return;
}
i::wasm::FunctionSig* sig = builder.Build();
i::Handle<i::JSReceiver> callable =
Utils::OpenHandle(*args[1].As<Function>());
i::Handle<i::JSFunction> result =
i::WasmJSFunction::New(i_isolate, sig, callable);
args.GetReturnValue().Set(Utils::ToLocal(result));
}
constexpr const char* kName_WasmGlobalObject = "WebAssembly.Global";
constexpr const char* kName_WasmMemoryObject = "WebAssembly.Memory";
constexpr const char* kName_WasmInstanceObject = "WebAssembly.Instance";
constexpr const char* kName_WasmTableObject = "WebAssembly.Table";
#define EXTRACT_THIS(var, WasmType) \
i::Handle<i::WasmType> var; \
{ \
i::Handle<i::Object> this_arg = Utils::OpenHandle(*args.This()); \
if (!this_arg->Is##WasmType()) { \
thrower.TypeError("Receiver is not a %s", kName_##WasmType); \
return; \
} \
var = i::Handle<i::WasmType>::cast(this_arg); \
}
void WebAssemblyInstanceGetExports(
const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
HandleScope scope(isolate);
ScheduledErrorThrower thrower(i_isolate, "WebAssembly.Instance.exports()");
EXTRACT_THIS(receiver, WasmInstanceObject);
i::Handle<i::JSObject> exports_object(receiver->exports_object(), i_isolate);
args.GetReturnValue().Set(Utils::ToLocal(exports_object));
}
void WebAssemblyTableGetLength(
const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
HandleScope scope(isolate);
ScheduledErrorThrower thrower(i_isolate, "WebAssembly.Table.length()");
EXTRACT_THIS(receiver, WasmTableObject);
args.GetReturnValue().Set(
v8::Number::New(isolate, receiver->current_length()));
}
// WebAssembly.Table.grow(num) -> num
void WebAssemblyTableGrow(const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
HandleScope scope(isolate);
ScheduledErrorThrower thrower(i_isolate, "WebAssembly.Table.grow()");
Local<Context> context = isolate->GetCurrentContext();
EXTRACT_THIS(receiver, WasmTableObject);
uint32_t grow_by;
if (!EnforceUint32("Argument 0", args[0], context, &thrower, &grow_by)) {
return;
}
int old_size = i::WasmTableObject::Grow(i_isolate, receiver, grow_by,
i_isolate->factory()->null_value());
if (old_size < 0) {
thrower.RangeError("failed to grow table by %u", grow_by);
return;
}
v8::ReturnValue<v8::Value> return_value = args.GetReturnValue();
return_value.Set(old_size);
}
// WebAssembly.Table.get(num) -> JSFunction
void WebAssemblyTableGet(const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
HandleScope scope(isolate);
ScheduledErrorThrower thrower(i_isolate, "WebAssembly.Table.get()");
Local<Context> context = isolate->GetCurrentContext();
EXTRACT_THIS(receiver, WasmTableObject);
uint32_t index;
if (!EnforceUint32("Argument 0", args[0], context, &thrower, &index)) {
return;
}
if (!i::WasmTableObject::IsInBounds(i_isolate, receiver, index)) {
thrower.RangeError("invalid index %u into function table", index);
return;
}
i::Handle<i::Object> result =
i::WasmTableObject::Get(i_isolate, receiver, index);
v8::ReturnValue<v8::Value> return_value = args.GetReturnValue();
return_value.Set(Utils::ToLocal(result));
}
// WebAssembly.Table.set(num, JSFunction)
void WebAssemblyTableSet(const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
HandleScope scope(isolate);
ScheduledErrorThrower thrower(i_isolate, "WebAssembly.Table.set()");
Local<Context> context = isolate->GetCurrentContext();
EXTRACT_THIS(table_object, WasmTableObject);
// Parameter 0.
uint32_t index;
if (!EnforceUint32("Argument 0", args[0], context, &thrower, &index)) {
return;
}
if (!i::WasmTableObject::IsInBounds(i_isolate, table_object, index)) {
thrower.RangeError("invalid index %u into function table", index);
return;
}
i::Handle<i::Object> element = Utils::OpenHandle(*args[1]);
if (!i::WasmTableObject::IsValidElement(i_isolate, table_object, element)) {
thrower.TypeError("Argument 1 must be null or a WebAssembly function");
return;
}
i::WasmTableObject::Set(i_isolate, table_object, index, element);
}
// WebAssembly.Table.type(WebAssembly.Table) -> TableType
void WebAssemblyTableGetType(const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
HandleScope scope(isolate);
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
ScheduledErrorThrower thrower(i_isolate, "WebAssembly.Table.type()");
auto maybe_table = GetFirstArgumentAsTable(args, &thrower);
if (thrower.error()) return;
i::Handle<i::WasmTableObject> table = maybe_table.ToHandleChecked();
v8::Local<v8::Object> ret = v8::Object::New(isolate);
Local<String> element;
auto enabled_features = i::wasm::WasmFeaturesFromFlags();
if (table->type() == i::wasm::ValueType::kWasmAnyFunc) {
element = v8_str(isolate, "anyfunc");
} else if (enabled_features.anyref &&
table->type() == i::wasm::ValueType::kWasmAnyRef) {
element = v8_str(isolate, "anyref");
} else {
UNREACHABLE();
}
// TODO(aseemgarg): update anyfunc to funcref
if (!ret->CreateDataProperty(isolate->GetCurrentContext(),
v8_str(isolate, "element"), element)
.IsJust()) {
return;
}
uint32_t curr_size = table->current_length();
DCHECK_LE(curr_size, std::numeric_limits<uint32_t>::max());
if (!ret->CreateDataProperty(isolate->GetCurrentContext(),
v8_str(isolate, "minimum"),
v8::Integer::NewFromUnsigned(
isolate, static_cast<uint32_t>(curr_size)))
.IsJust()) {
return;
}
if (!table->maximum_length().IsUndefined()) {
uint64_t max_size = table->maximum_length().Number();
DCHECK_LE(max_size, std::numeric_limits<uint32_t>::max());
if (!ret->CreateDataProperty(isolate->GetCurrentContext(),
v8_str(isolate, "maximum"),
v8::Integer::NewFromUnsigned(
isolate, static_cast<uint32_t>(max_size)))
.IsJust()) {
return;
}
}
v8::ReturnValue<v8::Value> return_value = args.GetReturnValue();
return_value.Set(ret);
}
// WebAssembly.Memory.grow(num) -> num
void WebAssemblyMemoryGrow(const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
HandleScope scope(isolate);
ScheduledErrorThrower thrower(i_isolate, "WebAssembly.Memory.grow()");
Local<Context> context = isolate->GetCurrentContext();
EXTRACT_THIS(receiver, WasmMemoryObject);
uint32_t delta_size;
if (!EnforceUint32("Argument 0", args[0], context, &thrower, &delta_size)) {
return;
}
uint64_t max_size64 = receiver->maximum_pages();
if (max_size64 > uint64_t{i::wasm::max_mem_pages()}) {
max_size64 = i::wasm::max_mem_pages();
}
i::Handle<i::JSArrayBuffer> old_buffer(receiver->array_buffer(), i_isolate);
DCHECK_LE(max_size64, std::numeric_limits<uint32_t>::max());
uint64_t old_size64 = old_buffer->byte_length() / i::wasm::kWasmPageSize;
uint64_t new_size64 = old_size64 + static_cast<uint64_t>(delta_size);
if (new_size64 > max_size64) {
thrower.RangeError("Maximum memory size exceeded");
return;
}
int32_t ret = i::WasmMemoryObject::Grow(i_isolate, receiver, delta_size);
if (ret == -1) {
thrower.RangeError("Unable to grow instance memory.");
return;
}
v8::ReturnValue<v8::Value> return_value = args.GetReturnValue();
return_value.Set(ret);
}
// WebAssembly.Memory.buffer -> ArrayBuffer
void WebAssemblyMemoryGetBuffer(
const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
HandleScope scope(isolate);
ScheduledErrorThrower thrower(i_isolate, "WebAssembly.Memory.buffer");
EXTRACT_THIS(receiver, WasmMemoryObject);
i::Handle<i::Object> buffer_obj(receiver->array_buffer(), i_isolate);
DCHECK(buffer_obj->IsJSArrayBuffer());
i::Handle<i::JSArrayBuffer> buffer(i::JSArrayBuffer::cast(*buffer_obj),
i_isolate);
if (buffer->is_shared()) {
// TODO(gdeepti): More needed here for when cached buffer, and current
// buffer are out of sync, handle that here when bounds checks, and Grow
// are handled correctly.
Maybe<bool> result =
buffer->SetIntegrityLevel(buffer, i::FROZEN, i::kDontThrow);
if (!result.FromJust()) {
thrower.TypeError(
"Status of setting SetIntegrityLevel of buffer is false.");
}
}
v8::ReturnValue<v8::Value> return_value = args.GetReturnValue();
return_value.Set(Utils::ToLocal(buffer));
}
// WebAssembly.Memory.type(WebAssembly.Memory) -> MemoryType
void WebAssemblyMemoryGetType(const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
HandleScope scope(isolate);
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
ScheduledErrorThrower thrower(i_isolate, "WebAssembly.Memory.type()");
auto maybe_memory = GetFirstArgumentAsMemory(args, &thrower);
if (thrower.error()) return;
i::Handle<i::WasmMemoryObject> memory = maybe_memory.ToHandleChecked();
v8::Local<v8::Object> ret = v8::Object::New(isolate);
i::Handle<i::JSArrayBuffer> buffer(memory->array_buffer(), i_isolate);
size_t curr_size = buffer->byte_length() / i::wasm::kWasmPageSize;
DCHECK_LE(curr_size, std::numeric_limits<uint32_t>::max());
if (!ret->CreateDataProperty(isolate->GetCurrentContext(),
v8_str(isolate, "minimum"),
v8::Integer::NewFromUnsigned(
isolate, static_cast<uint32_t>(curr_size)))
.IsJust()) {
return;
}
if (memory->has_maximum_pages()) {
uint64_t max_size = memory->maximum_pages();
DCHECK_LE(max_size, std::numeric_limits<uint32_t>::max());
if (!ret->CreateDataProperty(isolate->GetCurrentContext(),
v8_str(isolate, "maximum"),
v8::Integer::NewFromUnsigned(
isolate, static_cast<uint32_t>(max_size)))
.IsJust()) {
return;
}
}
v8::ReturnValue<v8::Value> return_value = args.GetReturnValue();
return_value.Set(ret);
}
void WebAssemblyGlobalGetValueCommon(
const v8::FunctionCallbackInfo<v8::Value>& args, const char* name) {
v8::Isolate* isolate = args.GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
HandleScope scope(isolate);
ScheduledErrorThrower thrower(i_isolate, name);
EXTRACT_THIS(receiver, WasmGlobalObject);
v8::ReturnValue<v8::Value> return_value = args.GetReturnValue();
switch (receiver->type()) {
case i::wasm::kWasmI32:
return_value.Set(receiver->GetI32());
break;
case i::wasm::kWasmI64: {
auto enabled_features = i::wasm::WasmFeaturesFromIsolate(i_isolate);
if (enabled_features.bigint) {
Local<BigInt> value = BigInt::New(isolate, receiver->GetI64());
return_value.Set(value);
} else {
thrower.TypeError("Can't get the value of i64 WebAssembly.Global");
}
break;
}
case i::wasm::kWasmF32:
return_value.Set(receiver->GetF32());
break;
case i::wasm::kWasmF64:
return_value.Set(receiver->GetF64());
break;
case i::wasm::kWasmAnyRef:
case i::wasm::kWasmAnyFunc:
case i::wasm::kWasmExceptRef:
return_value.Set(Utils::ToLocal(receiver->GetRef()));
break;
default:
UNREACHABLE();
}
}
// WebAssembly.Global.valueOf() -> num
void WebAssemblyGlobalValueOf(const v8::FunctionCallbackInfo<v8::Value>& args) {
return WebAssemblyGlobalGetValueCommon(args, "WebAssembly.Global.valueOf()");
}
// get WebAssembly.Global.value -> num
void WebAssemblyGlobalGetValue(
const v8::FunctionCallbackInfo<v8::Value>& args) {
return WebAssemblyGlobalGetValueCommon(args, "get WebAssembly.Global.value");
}
// set WebAssembly.Global.value(num)
void WebAssemblyGlobalSetValue(
const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
HandleScope scope(isolate);
Local<Context> context = isolate->GetCurrentContext();
ScheduledErrorThrower thrower(i_isolate, "set WebAssembly.Global.value");
EXTRACT_THIS(receiver, WasmGlobalObject);
if (!receiver->is_mutable()) {
thrower.TypeError("Can't set the value of an immutable global.");
return;
}
if (args[0]->IsUndefined()) {
thrower.TypeError("Argument 0 is required");
return;
}
switch (receiver->type()) {
case i::wasm::kWasmI32: {
int32_t i32_value = 0;
if (!args[0]->Int32Value(context).To(&i32_value)) return;
receiver->SetI32(i32_value);
break;
}
case i::wasm::kWasmI64: {
auto enabled_features = i::wasm::WasmFeaturesFromIsolate(i_isolate);
if (enabled_features.bigint) {
v8::Local<v8::BigInt> bigint_value;
if (!args[0]->ToBigInt(context).ToLocal(&bigint_value)) return;
receiver->SetI64(bigint_value->Int64Value());
} else {
thrower.TypeError("Can't set the value of i64 WebAssembly.Global");
}
break;
}
case i::wasm::kWasmF32: {
double f64_value = 0;
if (!args[0]->NumberValue(context).To(&f64_value)) return;
receiver->SetF32(static_cast<float>(f64_value));
break;
}
case i::wasm::kWasmF64: {
double f64_value = 0;
if (!args[0]->NumberValue(context).To(&f64_value)) return;
receiver->SetF64(f64_value);
break;
}
case i::wasm::kWasmAnyRef:
case i::wasm::kWasmExceptRef: {
receiver->SetAnyRef(Utils::OpenHandle(*args[0]));
break;
}
case i::wasm::kWasmAnyFunc: {
if (!receiver->SetAnyFunc(i_isolate, Utils::OpenHandle(*args[0]))) {
thrower.TypeError(
"value of an anyfunc reference must be either null or an "
"exported function");
}
break;
}
default:
UNREACHABLE();
}
}
// WebAssembly.Global.type(WebAssembly.Global) -> GlobalType
void WebAssemblyGlobalGetType(const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
HandleScope scope(isolate);
i::Isolate* i_isolate = reinterpret_cast<i::Isolate*>(isolate);
ScheduledErrorThrower thrower(i_isolate, "WebAssembly.Global.type()");
auto maybe_global = GetFirstArgumentAsGlobal(args, &thrower);
if (thrower.error()) return;
i::Handle<i::WasmGlobalObject> global = maybe_global.ToHandleChecked();
v8::Local<v8::Object> ret = v8::Object::New(isolate);
if (!ret->CreateDataProperty(isolate->GetCurrentContext(),
v8_str(isolate, "mutable"),
v8::Boolean::New(isolate, global->is_mutable()))
.IsJust()) {
return;
}
Local<String> type;
switch (global->type()) {
case i::wasm::kWasmI32: {
type = v8_str(isolate, "i32");
break;
}
case i::wasm::kWasmI64: {
type = v8_str(isolate, "i64");
break;
}
case i::wasm::kWasmF32: {
type = v8_str(isolate, "f32");
break;
}
case i::wasm::kWasmF64: {
type = v8_str(isolate, "f64");
break;
}
case i::wasm::kWasmAnyRef: {
type = v8_str(isolate, "anyref");
break;
}
default:
UNREACHABLE();
}
if (!ret->CreateDataProperty(isolate->GetCurrentContext(),
v8_str(isolate, "value"), type)
.IsJust()) {
return;
}
v8::ReturnValue<v8::Value> return_value = args.GetReturnValue();
return_value.Set(ret);
}
} // namespace
// TODO(titzer): we use the API to create the function template because the
// internal guts are too ugly to replicate here.
static i::Handle<i::FunctionTemplateInfo> NewFunctionTemplate(
i::Isolate* i_isolate, FunctionCallback func) {
Isolate* isolate = reinterpret_cast<Isolate*>(i_isolate);
Local<FunctionTemplate> templ = FunctionTemplate::New(isolate, func);
templ->ReadOnlyPrototype();
return v8::Utils::OpenHandle(*templ);
}
static i::Handle<i::ObjectTemplateInfo> NewObjectTemplate(
i::Isolate* i_isolate) {
Isolate* isolate = reinterpret_cast<Isolate*>(i_isolate);
Local<ObjectTemplate> templ = ObjectTemplate::New(isolate);
return v8::Utils::OpenHandle(*templ);
}
namespace internal {
Handle<JSFunction> CreateFunc(Isolate* isolate, Handle<String> name,
FunctionCallback func) {
Handle<FunctionTemplateInfo> temp = NewFunctionTemplate(isolate, func);
Handle<JSFunction> function =
ApiNatives::InstantiateFunction(temp, name).ToHandleChecked();
DCHECK(function->shared().HasSharedName());
return function;
}
Handle<JSFunction> InstallFunc(Isolate* isolate, Handle<JSObject> object,
const char* str, FunctionCallback func,
int length = 0,
PropertyAttributes attributes = NONE) {
Handle<String> name = v8_str(isolate, str);
Handle<JSFunction> function = CreateFunc(isolate, name, func);
function->shared().set_length(length);
JSObject::AddProperty(isolate, object, name, function, attributes);
return function;
}
Handle<JSFunction> InstallConstructorFunc(Isolate* isolate,
Handle<JSObject> object,
const char* str,
FunctionCallback func) {
return InstallFunc(isolate, object, str, func, 1, DONT_ENUM);
}
Handle<String> GetterName(Isolate* isolate, Handle<String> name) {
return Name::ToFunctionName(isolate, name, isolate->factory()->get_string())
.ToHandleChecked();
}
void InstallGetter(Isolate* isolate, Handle<JSObject> object, const char* str,
FunctionCallback func) {
Handle<String> name = v8_str(isolate, str);
Handle<JSFunction> function =
CreateFunc(isolate, GetterName(isolate, name), func);
Utils::ToLocal(object)->SetAccessorProperty(Utils::ToLocal(name),
Utils::ToLocal(function),
Local<Function>(), v8::None);
}
Handle<String> SetterName(Isolate* isolate, Handle<String> name) {
return Name::ToFunctionName(isolate, name, isolate->factory()->set_string())
.ToHandleChecked();
}
void InstallGetterSetter(Isolate* isolate, Handle<JSObject> object,
const char* str, FunctionCallback getter,
FunctionCallback setter) {
Handle<String> name = v8_str(isolate, str);
Handle<JSFunction> getter_func =
CreateFunc(isolate, GetterName(isolate, name), getter);
Handle<JSFunction> setter_func =
CreateFunc(isolate, SetterName(isolate, name), setter);
setter_func->shared().set_length(1);
v8::PropertyAttribute attributes = v8::None;
Utils::ToLocal(object)->SetAccessorProperty(
Utils::ToLocal(name), Utils::ToLocal(getter_func),
Utils::ToLocal(setter_func), attributes);
}
// Assigns a dummy instance template to the given constructor function. Used to
// make sure the implicit receivers for the constructors in this file have an
// instance type different from the internal one, they allocate the resulting
// object explicitly and ignore implicit receiver.
void SetDummyInstanceTemplate(Isolate* isolate, Handle<JSFunction> fun) {
Handle<ObjectTemplateInfo> instance_template = NewObjectTemplate(isolate);
FunctionTemplateInfo::SetInstanceTemplate(
isolate, handle(fun->shared().get_api_func_data(), isolate),
instance_template);
}
// static
void WasmJs::Install(Isolate* isolate, bool exposed_on_global_object) {
Handle<JSGlobalObject> global = isolate->global_object();
Handle<Context> context(global->native_context(), isolate);
// Install the JS API once only.
Object prev = context->get(Context::WASM_MODULE_CONSTRUCTOR_INDEX);
if (!prev.IsUndefined(isolate)) {
DCHECK(prev.IsJSFunction());
return;
}
Factory* factory = isolate->factory();
// Setup WebAssembly
Handle<String> name = v8_str(isolate, "WebAssembly");
NewFunctionArgs args = NewFunctionArgs::ForFunctionWithoutCode(
name, isolate->strict_function_map(), LanguageMode::kStrict);
Handle<JSFunction> cons = factory->NewFunction(args);
JSFunction::SetPrototype(cons, isolate->initial_object_prototype());
Handle<JSObject> webassembly =
factory->NewJSObject(cons, AllocationType::kOld);
PropertyAttributes ro_attributes =
static_cast<PropertyAttributes>(DONT_ENUM | READ_ONLY);
JSObject::AddProperty(isolate, webassembly, factory->to_string_tag_symbol(),
name, ro_attributes);
InstallFunc(isolate, webassembly, "compile", WebAssemblyCompile, 1);
InstallFunc(isolate, webassembly, "validate", WebAssemblyValidate, 1);
InstallFunc(isolate, webassembly, "instantiate", WebAssemblyInstantiate, 1);
if (FLAG_wasm_test_streaming) {
isolate->set_wasm_streaming_callback(WasmStreamingCallbackForTesting);
}
if (isolate->wasm_streaming_callback() != nullptr) {
InstallFunc(isolate, webassembly, "compileStreaming",
WebAssemblyCompileStreaming, 1);
InstallFunc(isolate, webassembly, "instantiateStreaming",
WebAssemblyInstantiateStreaming, 1);
}
// Expose the API on the global object if configured to do so.
if (exposed_on_global_object) {
JSObject::AddProperty(isolate, global, name, webassembly, DONT_ENUM);
}
// Setup Module
Handle<JSFunction> module_constructor =
InstallConstructorFunc(isolate, webassembly, "Module", WebAssemblyModule);
context->set_wasm_module_constructor(*module_constructor);
SetDummyInstanceTemplate(isolate, module_constructor);
JSFunction::EnsureHasInitialMap(module_constructor);
Handle<JSObject> module_proto(
JSObject::cast(module_constructor->instance_prototype()), isolate);
Handle<Map> module_map =
isolate->factory()->NewMap(i::WASM_MODULE_TYPE, WasmModuleObject::kSize);
JSFunction::SetInitialMap(module_constructor, module_map, module_proto);
InstallFunc(isolate, module_constructor, "imports", WebAssemblyModuleImports,
1);
InstallFunc(isolate, module_constructor, "exports", WebAssemblyModuleExports,
1);
InstallFunc(isolate, module_constructor, "customSections",
WebAssemblyModuleCustomSections, 2);
JSObject::AddProperty(isolate, module_proto, factory->to_string_tag_symbol(),
v8_str(isolate, "WebAssembly.Module"), ro_attributes);
// Setup Instance
Handle<JSFunction> instance_constructor = InstallConstructorFunc(
isolate, webassembly, "Instance", WebAssemblyInstance);
context->set_wasm_instance_constructor(*instance_constructor);
SetDummyInstanceTemplate(isolate, instance_constructor);
JSFunction::EnsureHasInitialMap(instance_constructor);
Handle<JSObject> instance_proto(
JSObject::cast(instance_constructor->instance_prototype()), isolate);
Handle<Map> instance_map = isolate->factory()->NewMap(
i::WASM_INSTANCE_TYPE, WasmInstanceObject::kSize);
JSFunction::SetInitialMap(instance_constructor, instance_map, instance_proto);
InstallGetter(isolate, instance_proto, "exports",
WebAssemblyInstanceGetExports);
JSObject::AddProperty(isolate, instance_proto,
factory->to_string_tag_symbol(),
v8_str(isolate, "WebAssembly.Instance"), ro_attributes);
// The context is not set up completely yet. That's why we cannot use
// {WasmFeaturesFromIsolate} and have to use {WasmFeaturesFromFlags} instead.
auto enabled_features = i::wasm::WasmFeaturesFromFlags();
// Setup Table
Handle<JSFunction> table_constructor =
InstallConstructorFunc(isolate, webassembly, "Table", WebAssemblyTable);
context->set_wasm_table_constructor(*table_constructor);
SetDummyInstanceTemplate(isolate, table_constructor);
JSFunction::EnsureHasInitialMap(table_constructor);
Handle<JSObject> table_proto(
JSObject::cast(table_constructor->instance_prototype()), isolate);
Handle<Map> table_map =
isolate->factory()->NewMap(i::WASM_TABLE_TYPE, WasmTableObject::kSize);
JSFunction::SetInitialMap(table_constructor, table_map, table_proto);
InstallGetter(isolate, table_proto, "length", WebAssemblyTableGetLength);
InstallFunc(isolate, table_proto, "grow", WebAssemblyTableGrow, 1);
InstallFunc(isolate, table_proto, "get", WebAssemblyTableGet, 1);
InstallFunc(isolate, table_proto, "set", WebAssemblyTableSet, 2);
if (enabled_features.type_reflection) {
InstallFunc(isolate, table_constructor, "type", WebAssemblyTableGetType, 1);
}
JSObject::AddProperty(isolate, table_proto, factory->to_string_tag_symbol(),
v8_str(isolate, "WebAssembly.Table"), ro_attributes);
// Setup Memory
Handle<JSFunction> memory_constructor =
InstallConstructorFunc(isolate, webassembly, "Memory", WebAssemblyMemory);
context->set_wasm_memory_constructor(*memory_constructor);
SetDummyInstanceTemplate(isolate, memory_constructor);
JSFunction::EnsureHasInitialMap(memory_constructor);
Handle<JSObject> memory_proto(
JSObject::cast(memory_constructor->instance_prototype()), isolate);
Handle<Map> memory_map =
isolate->factory()->NewMap(i::WASM_MEMORY_TYPE, WasmMemoryObject::kSize);
JSFunction::SetInitialMap(memory_constructor, memory_map, memory_proto);
InstallFunc(isolate, memory_proto, "grow", WebAssemblyMemoryGrow, 1);
InstallGetter(isolate, memory_proto, "buffer", WebAssemblyMemoryGetBuffer);
if (enabled_features.type_reflection) {
InstallFunc(isolate, memory_constructor, "type", WebAssemblyMemoryGetType,
1);
}
JSObject::AddProperty(isolate, memory_proto, factory->to_string_tag_symbol(),
v8_str(isolate, "WebAssembly.Memory"), ro_attributes);
// Setup Global
Handle<JSFunction> global_constructor =
InstallConstructorFunc(isolate, webassembly, "Global", WebAssemblyGlobal);
context->set_wasm_global_constructor(*global_constructor);
SetDummyInstanceTemplate(isolate, global_constructor);
JSFunction::EnsureHasInitialMap(global_constructor);
Handle<JSObject> global_proto(
JSObject::cast(global_constructor->instance_prototype()), isolate);
Handle<Map> global_map =
isolate->factory()->NewMap(i::WASM_GLOBAL_TYPE, WasmGlobalObject::kSize);
JSFunction::SetInitialMap(global_constructor, global_map, global_proto);
InstallFunc(isolate, global_proto, "valueOf", WebAssemblyGlobalValueOf, 0);
InstallGetterSetter(isolate, global_proto, "value", WebAssemblyGlobalGetValue,
WebAssemblyGlobalSetValue);
if (enabled_features.type_reflection) {
InstallFunc(isolate, global_constructor, "type", WebAssemblyGlobalGetType,
1);
}
JSObject::AddProperty(isolate, global_proto, factory->to_string_tag_symbol(),
v8_str(isolate, "WebAssembly.Global"), ro_attributes);
// Setup Exception
if (enabled_features.eh) {
Handle<JSFunction> exception_constructor = InstallConstructorFunc(
isolate, webassembly, "Exception", WebAssemblyException);
context->set_wasm_exception_constructor(*exception_constructor);
SetDummyInstanceTemplate(isolate, exception_constructor);
JSFunction::EnsureHasInitialMap(exception_constructor);
Handle<JSObject> exception_proto(
JSObject::cast(exception_constructor->instance_prototype()), isolate);
Handle<Map> exception_map = isolate->factory()->NewMap(
i::WASM_EXCEPTION_TYPE, WasmExceptionObject::kSize);
JSFunction::SetInitialMap(exception_constructor, exception_map,
exception_proto);
}
// Setup Function
if (enabled_features.type_reflection) {
Handle<JSFunction> function_constructor = InstallConstructorFunc(
isolate, webassembly, "Function", WebAssemblyFunction);
context->set_wasm_function_constructor(*function_constructor);
SetDummyInstanceTemplate(isolate, function_constructor);
JSFunction::EnsureHasInitialMap(function_constructor);
Handle<JSObject> function_proto(
JSObject::cast(function_constructor->instance_prototype()), isolate);
Handle<Map> function_map = isolate->factory()->CreateSloppyFunctionMap(
FUNCTION_WITHOUT_PROTOTYPE, MaybeHandle<JSFunction>());
CHECK(JSObject::SetPrototype(
function_proto,
handle(context->function_function().prototype(), isolate), false,
kDontThrow)
.FromJust());
JSFunction::SetInitialMap(function_constructor, function_map,
function_proto);
// Make all exported functions an instance of {WebAssembly.Function}.
context->set_wasm_exported_function_map(*function_map);
} else {
// Make all exported functions an instance of {Function}.
Handle<Map> function_map = isolate->sloppy_function_without_prototype_map();
context->set_wasm_exported_function_map(*function_map);
}
// Setup errors
Handle<JSFunction> compile_error(
isolate->native_context()->wasm_compile_error_function(), isolate);
JSObject::AddProperty(isolate, webassembly,
isolate->factory()->CompileError_string(),
compile_error, DONT_ENUM);
Handle<JSFunction> link_error(
isolate->native_context()->wasm_link_error_function(), isolate);
JSObject::AddProperty(isolate, webassembly,
isolate->factory()->LinkError_string(), link_error,
DONT_ENUM);
Handle<JSFunction> runtime_error(
isolate->native_context()->wasm_runtime_error_function(), isolate);
JSObject::AddProperty(isolate, webassembly,
isolate->factory()->RuntimeError_string(),
runtime_error, DONT_ENUM);
}
#undef ASSIGN
#undef EXTRACT_THIS
} // namespace internal
} // namespace v8