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// Copyright 2019 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/objects/synthetic-module.h"
#include "src/api/api-inl.h"
#include "src/builtins/accessors.h"
#include "src/objects/js-generator-inl.h"
#include "src/objects/module-inl.h"
#include "src/objects/objects-inl.h"
#include "src/objects/shared-function-info.h"
#include "src/objects/synthetic-module-inl.h"
#include "src/utils/ostreams.h"
namespace v8 {
namespace internal {
// Implements SetSyntheticModuleBinding:
// https://heycam.github.io/webidl/#setsyntheticmoduleexport
Maybe<bool> SyntheticModule::SetExport(Isolate* isolate,
Handle<SyntheticModule> module,
Handle<String> export_name,
Handle<Object> export_value) {
Handle<ObjectHashTable> exports(module->exports(), isolate);
Handle<Object> export_object(exports->Lookup(export_name), isolate);
if (!export_object->IsCell()) {
isolate->Throw(*isolate->factory()->NewReferenceError(
MessageTemplate::kModuleExportUndefined, export_name));
return Nothing<bool>();
}
// Spec step 2: Set the mutable binding of export_name to export_value
Cell::cast(*export_object).set_value(*export_value);
return Just(true);
}
void SyntheticModule::SetExportStrict(Isolate* isolate,
Handle<SyntheticModule> module,
Handle<String> export_name,
Handle<Object> export_value) {
Handle<ObjectHashTable> exports(module->exports(), isolate);
Handle<Object> export_object(exports->Lookup(export_name), isolate);
CHECK(export_object->IsCell());
Maybe<bool> set_export_result =
SetExport(isolate, module, export_name, export_value);
CHECK(set_export_result.FromJust());
}
// Implements Synthetic Module Record's ResolveExport concrete method:
// https://heycam.github.io/webidl/#smr-resolveexport
MaybeHandle<Cell> SyntheticModule::ResolveExport(
Isolate* isolate, Handle<SyntheticModule> module,
Handle<String> module_specifier, Handle<String> export_name,
MessageLocation loc, bool must_resolve) {
Handle<Object> object(module->exports().Lookup(export_name), isolate);
if (object->IsCell()) return Handle<Cell>::cast(object);
if (!must_resolve) return MaybeHandle<Cell>();
return isolate->ThrowAt<Cell>(
isolate->factory()->NewSyntaxError(MessageTemplate::kUnresolvableExport,
module_specifier, export_name),
&loc);
}
// Implements Synthetic Module Record's Instantiate concrete method :
// https://heycam.github.io/webidl/#smr-instantiate
bool SyntheticModule::PrepareInstantiate(Isolate* isolate,
Handle<SyntheticModule> module,
v8::Local<v8::Context> context) {
Handle<ObjectHashTable> exports(module->exports(), isolate);
Handle<FixedArray> export_names(module->export_names(), isolate);
// Spec step 7: For each export_name in module->export_names...
for (int i = 0, n = export_names->length(); i < n; ++i) {
// Spec step 7.1: Create a new mutable binding for export_name.
// Spec step 7.2: Initialize the new mutable binding to undefined.
Handle<Cell> cell =
isolate->factory()->NewCell(isolate->factory()->undefined_value());
Handle<String> name(String::cast(export_names->get(i)), isolate);
CHECK(exports->Lookup(name).IsTheHole(isolate));
exports = ObjectHashTable::Put(exports, name, cell);
}
module->set_exports(*exports);
return true;
}
// Second step of module instantiation. No real work to do for SyntheticModule
// as there are no imports or indirect exports to resolve;
// just update status.
bool SyntheticModule::FinishInstantiate(Isolate* isolate,
Handle<SyntheticModule> module) {
module->SetStatus(kLinked);
return true;
}
// Implements Synthetic Module Record's Evaluate concrete method:
// https://heycam.github.io/webidl/#smr-evaluate
MaybeHandle<Object> SyntheticModule::Evaluate(Isolate* isolate,
Handle<SyntheticModule> module) {
module->SetStatus(kEvaluating);
v8::Module::SyntheticModuleEvaluationSteps evaluation_steps =
FUNCTION_CAST<v8::Module::SyntheticModuleEvaluationSteps>(
module->evaluation_steps().foreign_address());
v8::Local<v8::Value> result;
if (!evaluation_steps(
Utils::ToLocal(Handle<Context>::cast(isolate->native_context())),
Utils::ToLocal(Handle<Module>::cast(module)))
.ToLocal(&result)) {
isolate->PromoteScheduledException();
module->RecordError(isolate, isolate->pending_exception());
return MaybeHandle<Object>();
}
module->SetStatus(kEvaluated);
Handle<Object> result_from_callback = Utils::OpenHandle(*result);
Handle<JSPromise> capability;
if (result_from_callback->IsJSPromise()) {
capability = Handle<JSPromise>::cast(result_from_callback);
} else {
// The host's evaluation steps should have returned a resolved Promise,
// but as an allowance to hosts that have not yet finished the migration
// to top-level await, create a Promise if the callback result didn't give
// us one.
capability = isolate->factory()->NewJSPromise();
JSPromise::Resolve(capability, isolate->factory()->undefined_value())
.ToHandleChecked();
}
module->set_top_level_capability(*capability);
return result_from_callback;
}
} // namespace internal
} // namespace v8
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