firefox-main/js/src/builtin/ModuleObject.cpp (file symbol)

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "builtin/ModuleObject.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/ScopeExit.h"
#include "builtin/Promise.h"
#include "builtin/SelfHostingDefines.h"
#include "frontend/ParseNode.h"
#include "frontend/ParserAtom.h" // TaggedParserAtomIndex, ParserAtomsTable, ParserAtom
#include "frontend/SharedContext.h"
#include "frontend/Stencil.h"
#include "gc/GCContext.h"
#include "gc/Tracer.h"
#include "js/ColumnNumber.h" // JS::ColumnNumberOneOrigin, JS::LimitedColumnNumberOneOrigin
#include "js/friend/ErrorMessages.h" // JSMSG_*
#include "js/Modules.h" // JS::GetModulePrivate, JS::ModuleDynamicImportHook, JS::ModuleType
#include "vm/EqualityOperations.h" // js::SameValue
#include "vm/Interpreter.h" // Execute, Lambda, ReportRuntimeLexicalError
#include "vm/ModuleBuilder.h" // js::ModuleBuilder
#include "vm/Modules.h"
#include "vm/PlainObject.h" // js::PlainObject
#include "vm/PromiseObject.h" // js::PromiseObject
#include "vm/SharedStencil.h" // js::GCThingIndex
#include "vm/StringType.h" // js::IdToPrintableUTF8
#include "wasm/WasmJS.h" // js::WasmModuleObject
#include "gc/GCContext-inl.h"
#include "vm/EnvironmentObject-inl.h" // EnvironmentObject::setAliasedBinding
#include "vm/JSObject-inl.h"
#include "vm/JSScript-inl.h"
#include "vm/List-inl.h"
#include "vm/NativeObject-inl.h"
using namespace js;
using mozilla::Maybe;
using mozilla::Nothing;
using mozilla::Some;
using mozilla::Span;
static_assert(ModuleStatus::New < ModuleStatus::Unlinked &&
ModuleStatus::Unlinked < ModuleStatus::Linking &&
ModuleStatus::Linking < ModuleStatus::Linked &&
ModuleStatus::Linked < ModuleStatus::Evaluating &&
ModuleStatus::Evaluating < ModuleStatus::EvaluatingAsync &&
ModuleStatus::EvaluatingAsync < ModuleStatus::Evaluated &&
ModuleStatus::Evaluated < ModuleStatus::Evaluated_Error,
"Module statuses are ordered incorrectly");
static Value StringOrNullValue(JSString* maybeString) {
return maybeString ? StringValue(maybeString) : NullValue();
}
static Value ModuleTypeToValue(JS::ModuleType moduleType) {
static_assert(size_t(JS::ModuleType::Limit) <= INT32_MAX);
return Int32Value(int32_t(moduleType));
}
static JS::ModuleType ValueToModuleType(const Value& value) {
int32_t i = value.toInt32();
MOZ_ASSERT(i >= 0 && i <= int32_t(JS::ModuleType::Limit));
return static_cast<JS::ModuleType>(i);
}
static Value ImportPhaseToValue(ImportPhase phase) {
static_assert(size_t(ImportPhase::Limit) <= INT32_MAX);
return Int32Value(int32_t(phase));
}
static ImportPhase ValueToImportPhase(const Value& value) {
int32_t i = value.toInt32();
MOZ_ASSERT(i >= 0 && i <= int32_t(ImportPhase::Limit));
return static_cast<ImportPhase>(i);
}
#define DEFINE_ATOM_ACCESSOR_METHOD(cls, name, slot) \
JSAtom* cls::name() const { \
Value value = getReservedSlot(slot); \
return &value.toString()->asAtom(); \
}
#define DEFINE_ATOM_OR_NULL_ACCESSOR_METHOD(cls, name, slot) \
JSAtom* cls::name() const { \
Value value = getReservedSlot(slot); \
if (value.isNull()) { \
return nullptr; \
} \
return &value.toString()->asAtom(); \
}
///////////////////////////////////////////////////////////////////////////
// ImportEntry
ImportEntry::ImportEntry(Handle<ModuleRequestObject*> moduleRequest,
Handle<JSAtom*> maybeImportName,
Handle<JSAtom*> localName, uint32_t lineNumber,
JS::ColumnNumberOneOrigin columnNumber)
: moduleRequest_(moduleRequest),
importName_(maybeImportName),
localName_(localName),
lineNumber_(lineNumber),
columnNumber_(columnNumber) {}
void ImportEntry::trace(JSTracer* trc) {
TraceEdge(trc, &moduleRequest_, "ImportEntry::moduleRequest_");
TraceEdge(trc, &importName_, "ImportEntry::importName_");
TraceEdge(trc, &localName_, "ImportEntry::localName_");
}
///////////////////////////////////////////////////////////////////////////
// ExportEntry
ExportEntry::ExportEntry(Handle<JSAtom*> maybeExportName,
Handle<ModuleRequestObject*> moduleRequest,
Handle<JSAtom*> maybeImportName,
Handle<JSAtom*> maybeLocalName, uint32_t lineNumber,
JS::ColumnNumberOneOrigin columnNumber)
: exportName_(maybeExportName),
moduleRequest_(moduleRequest),
importName_(maybeImportName),
localName_(maybeLocalName),
lineNumber_(lineNumber),
columnNumber_(columnNumber) {
// Line and column numbers are optional for export entries since direct
// entries are checked at parse time.
}
void ExportEntry::trace(JSTracer* trc) {
TraceEdge(trc, &exportName_, "ExportEntry::exportName_");
TraceEdge(trc, &moduleRequest_, "ExportEntry::moduleRequest_");
TraceEdge(trc, &importName_, "ExportEntry::importName_");
TraceEdge(trc, &localName_, "ExportEntry::localName_");
}
///////////////////////////////////////////////////////////////////////////
// RequestedModule
/* static */
RequestedModule::RequestedModule(Handle<ModuleRequestObject*> moduleRequest,
uint32_t lineNumber,
JS::ColumnNumberOneOrigin columnNumber)
: moduleRequest_(moduleRequest),
lineNumber_(lineNumber),
columnNumber_(columnNumber) {}
void RequestedModule::trace(JSTracer* trc) {
TraceEdge(trc, &moduleRequest_, "RequestedModule::moduleRequest_");
}
///////////////////////////////////////////////////////////////////////////
// ResolvedBindingObject
/* static */ const JSClass ResolvedBindingObject::class_ = {
"ResolvedBinding",
JSCLASS_HAS_RESERVED_SLOTS(ResolvedBindingObject::SlotCount),
};
ModuleObject* ResolvedBindingObject::module() const {
Value value = getReservedSlot(ModuleSlot);
return &value.toObject().as<ModuleObject>();
}
JSAtom* ResolvedBindingObject::bindingName() const {
Value value = getReservedSlot(BindingNameSlot);
return &value.toString()->asAtom();
}
/* static */
bool ResolvedBindingObject::isInstance(HandleValue value) {
return value.isObject() && value.toObject().is<ResolvedBindingObject>();
}
/* static */
ResolvedBindingObject* ResolvedBindingObject::create(
JSContext* cx, Handle<ModuleObject*> module, Handle<JSAtom*> bindingName) {
ResolvedBindingObject* self =
NewObjectWithGivenProto<ResolvedBindingObject>(cx, nullptr);
if (!self) {
return nullptr;
}
self->initReservedSlot(ModuleSlot, ObjectValue(*module));
self->initReservedSlot(BindingNameSlot, StringValue(bindingName));
return self;
}
///////////////////////////////////////////////////////////////////////////
// ImportAttribute
ImportAttribute::ImportAttribute(Handle<JSAtom*> key, Handle<JSString*> value)
: key_(key), value_(value) {}
void ImportAttribute::trace(JSTracer* trc) {
TraceEdge(trc, &key_, "ImportAttribute::key_");
TraceEdge(trc, &value_, "ImportAttribute::value_");
}
///////////////////////////////////////////////////////////////////////////
// ModuleRequestObject
/* static */ const JSClass ModuleRequestObject::class_ = {
"ModuleRequest",
JSCLASS_HAS_RESERVED_SLOTS(ModuleRequestObject::SlotCount),
};
DEFINE_ATOM_OR_NULL_ACCESSOR_METHOD(ModuleRequestObject, specifier,
SpecifierSlot)
JS::ModuleType ModuleRequestObject::moduleType() const {
return ValueToModuleType(getReservedSlot(ModuleTypeSlot));
}
ImportPhase ModuleRequestObject::phase() const {
return ValueToImportPhase(getReservedSlot(PhaseSlot));
}
static bool GetModuleType(JSContext* cx,
Handle<ImportAttributeVector> maybeAttributes,
JS::ModuleType& moduleType) {
for (const ImportAttribute& importAttribute : maybeAttributes) {
if (importAttribute.key() == cx->names().type) {
Rooted<JSLinearString*> typeStr(
cx, importAttribute.value()->ensureLinear(cx));
if (!typeStr) {
return false;
}
if (js::EqualStrings(typeStr, cx->names().json)) {
moduleType = JS::ModuleType::JSON;
} else if (js::EqualStrings(typeStr, cx->names().css)) {
moduleType = JS::ModuleType::CSS;
}
#ifdef NIGHTLY_BUILD
else if (JS::Prefs::experimental_import_bytes() &&
js::EqualStrings(typeStr, cx->names().bytes)) {
moduleType = JS::ModuleType::Bytes;
}
#endif
else if (JS::Prefs::experimental_import_text() &&
js::EqualStrings(typeStr, cx->names().text)) {
moduleType = JS::ModuleType::Text;
} else {
moduleType = JS::ModuleType::Unknown;
}
return true;
}
}
moduleType = JS::ModuleType::JavaScript;
return true;
}
/* static */
bool ModuleRequestObject::isInstance(HandleValue value) {
return value.isObject() && value.toObject().is<ModuleRequestObject>();
}
/* static */
ModuleRequestObject* ModuleRequestObject::create(
JSContext* cx, Handle<JSAtom*> specifier,
Handle<ImportAttributeVector> maybeAttributes, ImportPhase phase) {
JS::ModuleType moduleType = JS::ModuleType::JavaScript;
if (!GetModuleType(cx, maybeAttributes, moduleType)) {
return nullptr;
}
return create(cx, specifier, moduleType, phase);
}
/* static */
ModuleRequestObject* ModuleRequestObject::create(JSContext* cx,
Handle<JSAtom*> specifier,
JS::ModuleType moduleType,
ImportPhase phase) {
ModuleRequestObject* self =
NewObjectWithGivenProto<ModuleRequestObject>(cx, nullptr);
if (!self) {
return nullptr;
}
self->initReservedSlot(SpecifierSlot, StringOrNullValue(specifier));
self->initReservedSlot(ModuleTypeSlot, ModuleTypeToValue(moduleType));
self->initReservedSlot(PhaseSlot, ImportPhaseToValue(phase));
return self;
}
void ModuleRequestObject::setFirstUnsupportedAttributeKey(Handle<JSAtom*> key) {
initReservedSlot(FirstUnsupportedAttributeKeySlot, StringOrNullValue(key));
}
bool ModuleRequestObject::hasFirstUnsupportedAttributeKey() const {
return !getReservedSlot(FirstUnsupportedAttributeKeySlot).isNullOrUndefined();
}
JSAtom* ModuleRequestObject::getFirstUnsupportedAttributeKey() const {
if (!hasFirstUnsupportedAttributeKey()) {
return nullptr;
}
return &getReservedSlot(FirstUnsupportedAttributeKeySlot)
.toString()
->asAtom();
}
///////////////////////////////////////////////////////////////////////////
// IndirectBindingMap
IndirectBindingMap::Binding::Binding(ModuleEnvironmentObject* environment,
jsid targetName, PropertyInfo prop)
: environment(environment),
#ifdef DEBUG
targetName(targetName),
#endif
prop(prop) {
}
void IndirectBindingMap::trace(JSTracer* trc) {
if (!map_) {
return;
}
for (auto iter = map_->modIter(); !iter.done(); iter.next()) {
Binding& b = iter.get().value();
TraceEdge(trc, &b.environment, "module bindings environment");
#ifdef DEBUG
TraceEdge(trc, &b.targetName, "module bindings target name");
#endif
mozilla::DebugOnly<jsid> prev(iter.get().key());
TraceEdge(trc, &iter.get().mutableKey(), "module bindings binding name");
MOZ_ASSERT(iter.get().key() == prev);
}
}
bool IndirectBindingMap::put(JSContext* cx, HandleId name,
Handle<ModuleEnvironmentObject*> environment,
HandleId targetName) {
if (!map_) {
map_.emplace(cx->zone());
}
mozilla::Maybe<PropertyInfo> prop = environment->lookup(cx, targetName);
MOZ_ASSERT(prop.isSome());
if (!map_->put(name, Binding(environment, targetName, *prop))) {
ReportOutOfMemory(cx);
return false;
}
return true;
}
bool IndirectBindingMap::lookup(jsid name, ModuleEnvironmentObject** envOut,
mozilla::Maybe<PropertyInfo>* propOut) const {
if (!map_) {
return false;
}
auto ptr = map_->lookup(name);
if (!ptr) {
return false;
}
const Binding& binding = ptr->value();
MOZ_ASSERT(binding.environment);
MOZ_ASSERT(
binding.environment->containsPure(binding.targetName, binding.prop));
*envOut = binding.environment;
*propOut = Some(binding.prop);
return true;
}
///////////////////////////////////////////////////////////////////////////
// ModuleNamespaceObject
/* static */
constexpr ModuleNamespaceObject::ProxyHandler
ModuleNamespaceObject::proxyHandler;
/* static */
bool ModuleNamespaceObject::isInstance(HandleValue value) {
return value.isObject() && value.toObject().is<ModuleNamespaceObject>();
}
/* static */
ModuleNamespaceObject* ModuleNamespaceObject::create(
JSContext* cx, Handle<ModuleObject*> module,
MutableHandle<UniquePtr<ExportNameVector>> exports,
MutableHandle<UniquePtr<IndirectBindingMap>> bindings) {
RootedValue priv(cx, ObjectValue(*module));
ProxyOptions options;
options.setLazyProto(true);
RootedObject object(
cx, NewProxyObject(cx, &proxyHandler, priv, nullptr, options));
if (!object) {
return nullptr;
}
SetProxyReservedSlot(object, ExportsSlot,
PrivateValue(exports.get().release()));
AddCellMemory(object, sizeof(ExportNameVector), MemoryUse::ModuleExports);
SetProxyReservedSlot(object, BindingsSlot,
PrivateValue(bindings.get().release()));
AddCellMemory(object, sizeof(IndirectBindingMap),
MemoryUse::ModuleBindingMap);
return &object->as<ModuleNamespaceObject>();
}
ModuleObject& ModuleNamespaceObject::module() {
return GetProxyPrivate(this).toObject().as<ModuleObject>();
}
const ExportNameVector& ModuleNamespaceObject::exports() const {
Value value = GetProxyReservedSlot(this, ExportsSlot);
auto* exports = static_cast<ExportNameVector*>(value.toPrivate());
MOZ_ASSERT(exports);
return *exports;
}
ExportNameVector& ModuleNamespaceObject::mutableExports() {
// Get a non-const reference for tracing/destruction. Do not actually mutate
// this vector! This would be incorrect without adding barriers.
return const_cast<ExportNameVector&>(exports());
}
IndirectBindingMap& ModuleNamespaceObject::bindings() {
Value value = GetProxyReservedSlot(this, BindingsSlot);
auto* bindings = static_cast<IndirectBindingMap*>(value.toPrivate());
MOZ_ASSERT(bindings);
return *bindings;
}
bool ModuleNamespaceObject::hasExports() const {
// Exports may not be present if we hit OOM in initialization.
return !GetProxyReservedSlot(this, ExportsSlot).isUndefined();
}
bool ModuleNamespaceObject::hasBindings() const {
// Import bindings may not be present if we hit OOM in initialization.
return !GetProxyReservedSlot(this, BindingsSlot).isUndefined();
}
bool ModuleNamespaceObject::addBinding(JSContext* cx,
Handle<JSAtom*> exportedName,
Handle<ModuleObject*> targetModule,
Handle<JSAtom*> targetName) {
Rooted<ModuleEnvironmentObject*> environment(
cx, &targetModule->initialEnvironment());
RootedId exportedNameId(cx, AtomToId(exportedName));
RootedId targetNameId(cx, AtomToId(targetName));
return bindings().put(cx, exportedNameId, environment, targetNameId);
}
constexpr char ModuleNamespaceObject::ProxyHandler::family = 0;
static void ReportUninitializedModuleBinding(JSContext* cx, HandleId id) {
// Module export names are property keys and may not be identifier names,
// so use IdIsPropertyKey rather than IdIsIdentifier.
if (UniqueChars printable =
IdToPrintableUTF8(cx, id, IdToPrintableBehavior::IdIsPropertyKey)) {
JS_ReportErrorNumberUTF8(cx, GetErrorMessage, nullptr,
JSMSG_UNINITIALIZED_LEXICAL, printable.get());
}
}
bool ModuleNamespaceObject::ProxyHandler::getPrototype(
JSContext* cx, HandleObject proxy, MutableHandleObject protop) const {
protop.set(nullptr);
return true;
}
bool ModuleNamespaceObject::ProxyHandler::setPrototype(
JSContext* cx, HandleObject proxy, HandleObject proto,
ObjectOpResult& result) const {
if (!proto) {
return result.succeed();
}
return result.failCantSetProto();
}
bool ModuleNamespaceObject::ProxyHandler::getPrototypeIfOrdinary(
JSContext* cx, HandleObject proxy, bool* isOrdinary,
MutableHandleObject protop) const {
*isOrdinary = false;
return true;
}
bool ModuleNamespaceObject::ProxyHandler::setImmutablePrototype(
JSContext* cx, HandleObject proxy, bool* succeeded) const {
*succeeded = true;
return true;
}
bool ModuleNamespaceObject::ProxyHandler::isExtensible(JSContext* cx,
HandleObject proxy,
bool* extensible) const {
*extensible = false;
return true;
}
bool ModuleNamespaceObject::ProxyHandler::preventExtensions(
JSContext* cx, HandleObject proxy, ObjectOpResult& result) const {
result.succeed();
return true;
}
bool ModuleNamespaceObject::ProxyHandler::getOwnPropertyDescriptor(
JSContext* cx, HandleObject proxy, HandleId id,
MutableHandle<mozilla::Maybe<PropertyDescriptor>> desc) const {
Rooted<ModuleNamespaceObject*> ns(cx, &proxy->as<ModuleNamespaceObject>());
if (id.isSymbol()) {
if (id.isWellKnownSymbol(JS::SymbolCode::toStringTag)) {
desc.set(Some(PropertyDescriptor::Data(StringValue(cx->names().Module))));
return true;
}
desc.reset();
return true;
}
const IndirectBindingMap& bindings = ns->bindings();
ModuleEnvironmentObject* env;
mozilla::Maybe<PropertyInfo> prop;
if (!bindings.lookup(id, &env, &prop)) {
// Not found.
desc.reset();
return true;
}
RootedValue value(cx, env->getSlot(prop->slot()));
if (value.isMagic(JS_UNINITIALIZED_LEXICAL)) {
ReportUninitializedModuleBinding(cx, id);
return false;
}
desc.set(
Some(PropertyDescriptor::Data(value, {JS::PropertyAttribute::Enumerable,
JS::PropertyAttribute::Writable})));
return true;
}
static bool ValidatePropertyDescriptor(
JSContext* cx, Handle<PropertyDescriptor> desc, bool expectedWritable,
bool expectedEnumerable, bool expectedConfigurable,
HandleValue expectedValue, ObjectOpResult& result) {
if (desc.isAccessorDescriptor()) {
return result.fail(JSMSG_CANT_REDEFINE_PROP);
}
if (desc.hasWritable() && desc.writable() != expectedWritable) {
return result.fail(JSMSG_CANT_REDEFINE_PROP);
}
if (desc.hasEnumerable() && desc.enumerable() != expectedEnumerable) {
return result.fail(JSMSG_CANT_REDEFINE_PROP);
}
if (desc.hasConfigurable() && desc.configurable() != expectedConfigurable) {
return result.fail(JSMSG_CANT_REDEFINE_PROP);
}
if (desc.hasValue()) {
bool same;
if (!SameValue(cx, desc.value(), expectedValue, &same)) {
return false;
}
if (!same) {
return result.fail(JSMSG_CANT_REDEFINE_PROP);
}
}
return result.succeed();
}
bool ModuleNamespaceObject::ProxyHandler::defineProperty(
JSContext* cx, HandleObject proxy, HandleId id,
Handle<PropertyDescriptor> desc, ObjectOpResult& result) const {
if (id.isSymbol()) {
if (id.isWellKnownSymbol(JS::SymbolCode::toStringTag)) {
RootedValue value(cx, StringValue(cx->names().Module));
return ValidatePropertyDescriptor(cx, desc, false, false, false, value,
result);
}
return result.fail(JSMSG_CANT_DEFINE_PROP_OBJECT_NOT_EXTENSIBLE);
}
const IndirectBindingMap& bindings =
proxy->as<ModuleNamespaceObject>().bindings();
ModuleEnvironmentObject* env;
mozilla::Maybe<PropertyInfo> prop;
if (!bindings.lookup(id, &env, &prop)) {
return result.fail(JSMSG_CANT_DEFINE_PROP_OBJECT_NOT_EXTENSIBLE);
}
RootedValue value(cx, env->getSlot(prop->slot()));
if (value.isMagic(JS_UNINITIALIZED_LEXICAL)) {
ReportUninitializedModuleBinding(cx, id);
return false;
}
return ValidatePropertyDescriptor(cx, desc, true, true, false, value, result);
}
bool ModuleNamespaceObject::ProxyHandler::has(JSContext* cx, HandleObject proxy,
HandleId id, bool* bp) const {
Rooted<ModuleNamespaceObject*> ns(cx, &proxy->as<ModuleNamespaceObject>());
if (id.isSymbol()) {
*bp = id.isWellKnownSymbol(JS::SymbolCode::toStringTag);
return true;
}
*bp = ns->bindings().has(id);
return true;
}
bool ModuleNamespaceObject::ProxyHandler::get(JSContext* cx, HandleObject proxy,
HandleValue receiver, HandleId id,
MutableHandleValue vp) const {
Rooted<ModuleNamespaceObject*> ns(cx, &proxy->as<ModuleNamespaceObject>());
if (id.isSymbol()) {
if (id.isWellKnownSymbol(JS::SymbolCode::toStringTag)) {
vp.setString(cx->names().Module);
return true;
}
vp.setUndefined();
return true;
}
ModuleEnvironmentObject* env;
mozilla::Maybe<PropertyInfo> prop;
if (!ns->bindings().lookup(id, &env, &prop)) {
vp.setUndefined();
return true;
}
RootedValue value(cx, env->getSlot(prop->slot()));
if (value.isMagic(JS_UNINITIALIZED_LEXICAL)) {
ReportUninitializedModuleBinding(cx, id);
return false;
}
vp.set(value);
return true;
}
bool ModuleNamespaceObject::ProxyHandler::set(JSContext* cx, HandleObject proxy,
HandleId id, HandleValue v,
HandleValue receiver,
ObjectOpResult& result) const {
return result.failReadOnly();
}
bool ModuleNamespaceObject::ProxyHandler::delete_(
JSContext* cx, HandleObject proxy, HandleId id,
ObjectOpResult& result) const {
Rooted<ModuleNamespaceObject*> ns(cx, &proxy->as<ModuleNamespaceObject>());
if (id.isSymbol()) {
if (id.isWellKnownSymbol(JS::SymbolCode::toStringTag)) {
return result.failCantDelete();
}
return result.succeed();
}
if (ns->bindings().has(id)) {
return result.failCantDelete();
}
return result.succeed();
}
bool ModuleNamespaceObject::ProxyHandler::ownPropertyKeys(
JSContext* cx, HandleObject proxy, MutableHandleIdVector props) const {
Rooted<ModuleNamespaceObject*> ns(cx, &proxy->as<ModuleNamespaceObject>());
uint32_t count = ns->exports().length();
if (!props.reserve(props.length() + count + 1)) {
return false;
}
for (JSAtom* atom : ns->exports()) {
props.infallibleAppend(AtomToId(atom));
}
props.infallibleAppend(
PropertyKey::Symbol(cx->wellKnownSymbols().toStringTag));
return true;
}
void ModuleNamespaceObject::ProxyHandler::trace(JSTracer* trc,
JSObject* proxy) const {
auto& self = proxy->as<ModuleNamespaceObject>();
if (self.hasExports()) {
self.mutableExports().trace(trc);
}
if (self.hasBindings()) {
self.bindings().trace(trc);
}
}
void ModuleNamespaceObject::ProxyHandler::finalize(JS::GCContext* gcx,
JSObject* proxy) const {
auto& self = proxy->as<ModuleNamespaceObject>();
if (self.hasExports()) {
gcx->delete_(proxy, &self.mutableExports(), MemoryUse::ModuleExports);
}
if (self.hasBindings()) {
gcx->delete_(proxy, &self.bindings(), MemoryUse::ModuleBindingMap);
}
}
// 9.6.3 IncrementModuleAsyncEvaluationCount()
static uint32_t IncrementModuleAsyncEvaluationCount(JSRuntime* rt) {
if (rt->pendingAsyncModuleEvaluations == 0) {
// From the spec NOTE:
// An implementation may unobservably reset [[ModuleAsyncEvaluationCount]]
// to 0 whenever there are no pending modules.
rt->moduleAsyncEvaluatingPostOrder = 0;
}
uint32_t ordinal = rt->moduleAsyncEvaluatingPostOrder;
MOZ_ASSERT(ordinal != ASYNC_EVALUATING_POST_ORDER_DONE);
MOZ_ASSERT(ordinal != ASYNC_EVALUATING_POST_ORDER_UNSET);
MOZ_ASSERT(ordinal < ASYNC_EVALUATING_POST_ORDER_MAX_VALUE);
rt->moduleAsyncEvaluatingPostOrder++;
MOZ_ASSERT(rt->pendingAsyncModuleEvaluations < MAX_UINT32);
rt->pendingAsyncModuleEvaluations++;
return ordinal;
}
bool AsyncEvaluationOrder::isUnset() const {
return value == ASYNC_EVALUATING_POST_ORDER_UNSET;
}
bool AsyncEvaluationOrder::isDone() const {
return value == ASYNC_EVALUATING_POST_ORDER_DONE;
}
bool AsyncEvaluationOrder::isInteger() const {
return value <= ASYNC_EVALUATING_POST_ORDER_MAX_VALUE;
}
uint32_t AsyncEvaluationOrder::get() const {
MOZ_ASSERT(isInteger());
return value;
}
void AsyncEvaluationOrder::set(JSRuntime* rt) {
MOZ_ASSERT(isUnset());
value = IncrementModuleAsyncEvaluationCount(rt);
}
void AsyncEvaluationOrder::setDone(JSRuntime* rt) {
MOZ_ASSERT(isInteger());
MOZ_ASSERT(rt->pendingAsyncModuleEvaluations > 0);
rt->pendingAsyncModuleEvaluations--;
value = ASYNC_EVALUATING_POST_ORDER_DONE;
}
///////////////////////////////////////////////////////////////////////////
// AbstractModuleSourceObject
static bool AbstractModuleSourceConstructor(JSContext* cx, unsigned argc,
Value* vp) {
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
JSMSG_ABSTRACT_MODULE_SOURCE_CTOR);
return false;
}
static bool AbstractModuleSource_toStringTagGetter(JSContext* cx, unsigned argc,
Value* vp) {
CallArgs args = CallArgsFromVp(argc, vp);
// Step 2. If O is not an Object, return undefined.
if (!args.thisv().isObject()) {
args.rval().setUndefined();
return true;
}
// Step 1. Let O be the this value.
JSObject* obj = &args.thisv().toObject();
// Step 3. Let module be HostGetModuleSourceModuleRecord(O).
// Note: We currently only support source phase imports for wasm modules,
// and this is the only place HostGetModuleSourceModuleRecord is used in
// the specification. Rather than implement the full specification
// we just check the object type and then return "WebAssembly.Module".
if (!obj->is<WasmModuleObject>()) {
// Step 4. If module is not-a-source, return undefined.
args.rval().setUndefined();
return true;
}
// Step 5. Let name be module.GetModuleSourceKind().
JSAtom* name = Atomize(cx, WasmModuleObject::class_.name,
strlen(WasmModuleObject::class_.name));
if (!name) {
return false;
}
// Step 6. Assert: name is a String.
// (not applicable in our implementation)
// Step 7. Return name.
args.rval().setString(name);
return true;
}
static const JSPropertySpec abstract_module_source_proto_accessors[] = {
JS_SYM_GET(toStringTag, AbstractModuleSource_toStringTagGetter, 0),
JS_PS_END,
};
static JSObject* CreateAbstractModuleSourcePrototype(JSContext* cx,
JSProtoKey key) {
return GlobalObject::createBlankPrototype(
cx, cx->global(), &AbstractModuleSourceObject::class_);
}
static const ClassSpec AbstractModuleSourceObjectClassSpec = {
GenericCreateConstructor<AbstractModuleSourceConstructor, 0,
gc::AllocKind::FUNCTION>,
CreateAbstractModuleSourcePrototype,
nullptr,
nullptr,
nullptr,
abstract_module_source_proto_accessors,
nullptr,
ClassSpec::DontDefineConstructor,
};
/* static */ const JSClass AbstractModuleSourceObject::class_ = {
"AbstractModuleSource",
JSCLASS_HAS_CACHED_PROTO(JSProto_AbstractModuleSource),
JS_NULL_CLASS_OPS,
&AbstractModuleSourceObjectClassSpec,
};
///////////////////////////////////////////////////////////////////////////
// SyntheticModuleFields
// The fields of a synthetic module record, as described in:
class js::SyntheticModuleFields {
public:
ExportNameVector exportNames;
public:
void trace(JSTracer* trc);
};
void SyntheticModuleFields::trace(JSTracer* trc) { exportNames.trace(trc); }
///////////////////////////////////////////////////////////////////////////
// CyclicModuleFields
// The fields of a cyclic module record, as described in:
class js::CyclicModuleFields {
public:
ModuleStatus status = ModuleStatus::New;
bool hasTopLevelAwait : 1;
private:
// Flag bits that determine whether other fields are present.
bool hasDfsAncestorIndex : 1;
bool hasPendingAsyncDependencies : 1;
// Fields whose presence is conditional on the flag bits above.
uint32_t dfsAncestorIndex = 0;
uint32_t pendingAsyncDependencies = 0;
// Fields describing the layout of exportEntries.
uint32_t indirectExportEntriesStart = 0;
uint32_t starExportEntriesStart = 0;
public:
HeapPtr<Value> evaluationError;
HeapPtr<JSObject*> metaObject;
HeapPtr<ScriptSourceObject*> scriptSourceObject;
RequestedModuleVector requestedModules;
LoadedModuleMap loadedModules;
ImportEntryVector importEntries;
ExportEntryVector exportEntries;
IndirectBindingMap importBindings;
UniquePtr<FunctionDeclarationVector> functionDeclarations;
AsyncEvaluationOrder asyncEvaluationOrder;
HeapPtr<PromiseObject*> topLevelCapability;
HeapPtr<ListObject*> asyncParentModules;
HeapPtr<ModuleObject*> cycleRoot;
public:
CyclicModuleFields();
void trace(JSTracer* trc);
void initExportEntries(MutableHandle<ExportEntryVector> allEntries,
uint32_t localExportCount,
uint32_t indirectExportCount,
uint32_t starExportCount);
Span<const ExportEntry> localExportEntries() const;
Span<const ExportEntry> indirectExportEntries() const;
Span<const ExportEntry> starExportEntries() const;
void setDfsAncestorIndex(uint32_t index);
Maybe<uint32_t> maybeDfsAncestorIndex() const;
void clearDfsAncestorIndex();
void setPendingAsyncDependencies(uint32_t newValue);
Maybe<uint32_t> maybePendingAsyncDependencies() const;
};
CyclicModuleFields::CyclicModuleFields()
: hasTopLevelAwait(false),
hasDfsAncestorIndex(false),
hasPendingAsyncDependencies(false) {}
void CyclicModuleFields::trace(JSTracer* trc) {
TraceEdge(trc, &evaluationError, "CyclicModuleFields::evaluationError");
TraceEdge(trc, &metaObject, "CyclicModuleFields::metaObject");
TraceEdge(trc, &scriptSourceObject, "CyclicModuleFields::scriptSourceObject");
requestedModules.trace(trc);
loadedModules.trace(trc);
importEntries.trace(trc);
exportEntries.trace(trc);
importBindings.trace(trc);
TraceEdge(trc, &topLevelCapability, "CyclicModuleFields::topLevelCapability");
TraceEdge(trc, &asyncParentModules, "CyclicModuleFields::asyncParentModules");
TraceEdge(trc, &cycleRoot, "CyclicModuleFields::cycleRoot");
}
void CyclicModuleFields::initExportEntries(
MutableHandle<ExportEntryVector> allEntries, uint32_t localExportCount,
uint32_t indirectExportCount, uint32_t starExportCount) {
MOZ_ASSERT(allEntries.length() ==
localExportCount + indirectExportCount + starExportCount);
exportEntries = std::move(allEntries.get());
indirectExportEntriesStart = localExportCount;
starExportEntriesStart = indirectExportEntriesStart + indirectExportCount;
}
Span<const ExportEntry> CyclicModuleFields::localExportEntries() const {
MOZ_ASSERT(indirectExportEntriesStart <= exportEntries.length());
return Span(exportEntries.begin(),
exportEntries.begin() + indirectExportEntriesStart);
}
Span<const ExportEntry> CyclicModuleFields::indirectExportEntries() const {
MOZ_ASSERT(indirectExportEntriesStart <= starExportEntriesStart);
MOZ_ASSERT(starExportEntriesStart <= exportEntries.length());
return Span(exportEntries.begin() + indirectExportEntriesStart,
exportEntries.begin() + starExportEntriesStart);
}
Span<const ExportEntry> CyclicModuleFields::starExportEntries() const {
MOZ_ASSERT(starExportEntriesStart <= exportEntries.length());
return Span(exportEntries.begin() + starExportEntriesStart,
exportEntries.end());
}
void CyclicModuleFields::setDfsAncestorIndex(uint32_t index) {
dfsAncestorIndex = index;
hasDfsAncestorIndex = true;
}
Maybe<uint32_t> CyclicModuleFields::maybeDfsAncestorIndex() const {
return hasDfsAncestorIndex ? Some(dfsAncestorIndex) : Nothing();
}
void CyclicModuleFields::clearDfsAncestorIndex() {
dfsAncestorIndex = 0;
hasDfsAncestorIndex = false;
}
void CyclicModuleFields::setPendingAsyncDependencies(uint32_t newValue) {
pendingAsyncDependencies = newValue;
hasPendingAsyncDependencies = true;
}
Maybe<uint32_t> CyclicModuleFields::maybePendingAsyncDependencies() const {
return hasPendingAsyncDependencies ? Some(pendingAsyncDependencies)
: Nothing();
}
///////////////////////////////////////////////////////////////////////////
// ModuleObject
/* static */ const JSClassOps ModuleObject::classOps_ = {
.finalize = ModuleObject::finalize,
.trace = ModuleObject::trace,
};
/* static */ const JSClass ModuleObject::class_ = {
"Module",
JSCLASS_HAS_RESERVED_SLOTS(ModuleObject::SlotCount) |
JSCLASS_BACKGROUND_FINALIZE,
&ModuleObject::classOps_,
};
/* static */
bool ModuleObject::isInstance(HandleValue value) {
return value.isObject() && value.toObject().is<ModuleObject>();
}
bool ModuleObject::hasCyclicModuleFields() const {
bool result = !getReservedSlot(CyclicModuleFieldsSlot).isUndefined();
MOZ_ASSERT_IF(result, !hasSyntheticModuleFields());
return result;
}
CyclicModuleFields* ModuleObject::cyclicModuleFields() {
MOZ_ASSERT(hasCyclicModuleFields());
void* ptr = getReservedSlot(CyclicModuleFieldsSlot).toPrivate();
MOZ_ASSERT(ptr);
return static_cast<CyclicModuleFields*>(ptr);
}
const CyclicModuleFields* ModuleObject::cyclicModuleFields() const {
return const_cast<ModuleObject*>(this)->cyclicModuleFields();
}
Span<const RequestedModule> ModuleObject::requestedModules() const {
return cyclicModuleFields()->requestedModules;
}
Span<const ImportEntry> ModuleObject::importEntries() const {
return cyclicModuleFields()->importEntries;
}
Span<const ExportEntry> ModuleObject::localExportEntries() const {
return cyclicModuleFields()->localExportEntries();
}
Span<const ExportEntry> ModuleObject::indirectExportEntries() const {
return cyclicModuleFields()->indirectExportEntries();
}
Span<const ExportEntry> ModuleObject::starExportEntries() const {
return cyclicModuleFields()->starExportEntries();
}
const ExportNameVector& ModuleObject::syntheticExportNames() const {
return syntheticModuleFields()->exportNames;
}
void ModuleObject::initFunctionDeclarations(
UniquePtr<FunctionDeclarationVector> decls) {
cyclicModuleFields()->functionDeclarations = std::move(decls);
}
/* static */
ModuleObject* ModuleObject::create(JSContext* cx) {
Rooted<UniquePtr<CyclicModuleFields>> fields(cx);
fields = cx->make_unique<CyclicModuleFields>();
if (!fields) {
return nullptr;
}
ModuleObject* self = NewObjectWithGivenProto<ModuleObject>(cx, nullptr);
if (!self) {
return nullptr;
}
InitReservedSlot(self, CyclicModuleFieldsSlot, fields.release(),
MemoryUse::ModuleCyclicFields);
return self;
}
/* static */
ModuleObject* ModuleObject::createSynthetic(
JSContext* cx, MutableHandle<ExportNameVector> exportNames) {
Rooted<UniquePtr<SyntheticModuleFields>> syntheticFields(cx);
syntheticFields = cx->make_unique<SyntheticModuleFields>();
if (!syntheticFields) {
return nullptr;
}
ModuleObject* self = NewObjectWithGivenProto<ModuleObject>(cx, nullptr);
if (!self) {
return nullptr;
}
InitReservedSlot(self, SyntheticModuleFieldsSlot, syntheticFields.release(),
MemoryUse::ModuleSyntheticFields);
self->syntheticModuleFields()->exportNames = std::move(exportNames.get());
return self;
}
/* static */
void ModuleObject::finalize(JS::GCContext* gcx, JSObject* obj) {
ModuleObject* self = &obj->as<ModuleObject>();
if (self->hasCyclicModuleFields()) {
gcx->delete_(obj, self->cyclicModuleFields(),
MemoryUse::ModuleCyclicFields);
}
if (self->hasSyntheticModuleFields()) {
gcx->delete_(obj, self->syntheticModuleFields(),
MemoryUse::ModuleSyntheticFields);
}
}
ModuleEnvironmentObject& ModuleObject::initialEnvironment() const {
Value value = getReservedSlot(EnvironmentSlot);
return value.toObject().as<ModuleEnvironmentObject>();
}
ModuleEnvironmentObject* ModuleObject::environment() const {
// Note that this it's valid to call this even if there was an error
// evaluating the module.
// According to the spec the environment record is created during linking, but
// we create it earlier than that.
if (status() < ModuleStatus::Linked) {
return nullptr;
}
return &initialEnvironment();
}
IndirectBindingMap& ModuleObject::importBindings() {
return cyclicModuleFields()->importBindings;
}
ModuleNamespaceObject* ModuleObject::namespace_() {
Value value = getReservedSlot(NamespaceSlot);
if (value.isUndefined()) {
return nullptr;
}
return &value.toObject().as<ModuleNamespaceObject>();
}
ScriptSourceObject* ModuleObject::scriptSourceObject() const {
return cyclicModuleFields()->scriptSourceObject;
}
JSObject* ModuleObject::moduleSource() const {
Value value = getReservedSlot(ModuleSourceSlot);
if (value.isUndefined()) {
return nullptr;
}
return &value.toObject();
}
void ModuleObject::initAsyncSlots(JSContext* cx, bool hasTopLevelAwait,
Handle<ListObject*> asyncParentModules) {
cyclicModuleFields()->hasTopLevelAwait = hasTopLevelAwait;
cyclicModuleFields()->asyncParentModules = asyncParentModules;
}
void ModuleObject::initScriptSlots(HandleScript script) {
MOZ_ASSERT(script);
MOZ_ASSERT(script->sourceObject());
MOZ_ASSERT(script->filename());
initReservedSlot(ScriptSlot, PrivateGCThingValue(script));
cyclicModuleFields()->scriptSourceObject = script->sourceObject();
}
void ModuleObject::initModuleSourceSlot(HandleObject moduleSource) {
initReservedSlot(ModuleSourceSlot, ObjectValue(*moduleSource));
}
void ModuleObject::initScriptSourceObject(ScriptSourceObject* sso) {
cyclicModuleFields()->scriptSourceObject = sso;
}
void ModuleObject::setInitialEnvironment(
Handle<ModuleEnvironmentObject*> initialEnvironment) {
initReservedSlot(EnvironmentSlot, ObjectValue(*initialEnvironment));
}
void ModuleObject::initImportExportData(
MutableHandle<RequestedModuleVector> requestedModules,
MutableHandle<ImportEntryVector> importEntries,
MutableHandle<ExportEntryVector> exportEntries, uint32_t localExportCount,
uint32_t indirectExportCount, uint32_t starExportCount) {
cyclicModuleFields()->requestedModules = std::move(requestedModules.get());
cyclicModuleFields()->importEntries = std::move(importEntries.get());
cyclicModuleFields()->initExportEntries(exportEntries, localExportCount,
indirectExportCount, starExportCount);
}
/* static */
bool ModuleObject::Freeze(JSContext* cx, Handle<ModuleObject*> self) {
return FreezeObject(cx, self);
}
#ifdef DEBUG
/* static */ inline bool ModuleObject::AssertFrozen(
JSContext* cx, Handle<ModuleObject*> self) {
bool frozen = false;
if (!TestIntegrityLevel(cx, self, IntegrityLevel::Frozen, &frozen)) {
return false;
}
MOZ_ASSERT(frozen);
return true;
}
#endif
JSScript* ModuleObject::maybeScript() const {
Value value = getReservedSlot(ScriptSlot);
if (value.isUndefined()) {
return nullptr;
}
BaseScript* script = value.toGCThing()->as<BaseScript>();
MOZ_ASSERT(script->hasBytecode(),
"Module scripts should always have bytecode");
return script->asJSScript();
}
JSScript* ModuleObject::script() const {
JSScript* ptr = maybeScript();
MOZ_RELEASE_ASSERT(ptr);
return ptr;
}
const char* ModuleObject::filename() const {
// The ScriptSlot will be cleared once the module is evaluated, so we try to
// get the filename from cyclicModuleFields().
// TODO: Bug 1885483: Provide filename for JSON modules
if (!hasCyclicModuleFields()) {
return "(JSON module)";
}
ScriptSourceObject* sso = cyclicModuleFields()->scriptSourceObject;
if (!sso->hasSource()) {
// TODO: Bug 2030454: Return the wasm module filename once we support
// evaluation phase imports.
return "(unknown)";
}
return sso->source()->filename();
}
static inline void AssertValidModuleStatus(ModuleStatus status) {
MOZ_ASSERT(status >= ModuleStatus::New &&
status <= ModuleStatus::Evaluated_Error);
}
ModuleStatus ModuleObject::status() const {
// Always return `ModuleStatus::Evaluated` so we can assert a module's status
// without checking which kind it is, even though synthetic modules don't have
// this field according to the spec.
if (hasSyntheticModuleFields()) {
return ModuleStatus::Evaluated;
}
ModuleStatus status = cyclicModuleFields()->status;
AssertValidModuleStatus(status);
if (status == ModuleStatus::Evaluated_Error) {
return ModuleStatus::Evaluated;
}
return status;
}
void ModuleObject::setStatus(ModuleStatus newStatus) {
AssertValidModuleStatus(newStatus);
// Note that under OOM conditions we can fail the module linking process even
// after modules have been marked as linked.
MOZ_ASSERT((status() <= ModuleStatus::Linked &&
(newStatus == ModuleStatus::Unlinked ||
newStatus == ModuleStatus::New)) ||
newStatus > status(),
"New module status inconsistent with current status");
cyclicModuleFields()->status = newStatus;
}
bool ModuleObject::hasTopLevelAwait() const {
return cyclicModuleFields()->hasTopLevelAwait;
}
AsyncEvaluationOrder& ModuleObject::asyncEvaluationOrder() {
return cyclicModuleFields()->asyncEvaluationOrder;
}
AsyncEvaluationOrder const& ModuleObject::asyncEvaluationOrder() const {
return cyclicModuleFields()->asyncEvaluationOrder;
}
Maybe<uint32_t> ModuleObject::maybeDfsAncestorIndex() const {
return cyclicModuleFields()->maybeDfsAncestorIndex();
}
uint32_t ModuleObject::dfsAncestorIndex() const {
return maybeDfsAncestorIndex().value();
}
void ModuleObject::setDfsAncestorIndex(uint32_t index) {
cyclicModuleFields()->setDfsAncestorIndex(index);
}
void ModuleObject::clearDfsAncestorIndex() {
cyclicModuleFields()->clearDfsAncestorIndex();
}
PromiseObject* ModuleObject::maybeTopLevelCapability() const {
return cyclicModuleFields()->topLevelCapability;
}
PromiseObject* ModuleObject::topLevelCapability() const {
PromiseObject* capability = maybeTopLevelCapability();
MOZ_RELEASE_ASSERT(capability);
return capability;
}
// static
PromiseObject* ModuleObject::createTopLevelCapability(
JSContext* cx, Handle<ModuleObject*> module) {
MOZ_ASSERT(!module->maybeTopLevelCapability());
Rooted<PromiseObject*> resultPromise(cx, CreatePromiseObjectForAsync(cx));
if (!resultPromise) {
return nullptr;
}
module->setInitialTopLevelCapability(resultPromise);
return resultPromise;
}
void ModuleObject::setInitialTopLevelCapability(
Handle<PromiseObject*> capability) {
cyclicModuleFields()->topLevelCapability = capability;
}
ListObject* ModuleObject::asyncParentModules() const {
return cyclicModuleFields()->asyncParentModules;
}
bool ModuleObject::appendAsyncParentModule(JSContext* cx,
Handle<ModuleObject*> self,
Handle<ModuleObject*> parent) {
Rooted<Value> parentValue(cx, ObjectValue(*parent));
return self->asyncParentModules()->append(cx, parentValue);
}
Maybe<uint32_t> ModuleObject::maybePendingAsyncDependencies() const {
return cyclicModuleFields()->maybePendingAsyncDependencies();
}
uint32_t ModuleObject::pendingAsyncDependencies() const {
return maybePendingAsyncDependencies().value();
}
void ModuleObject::setPendingAsyncDependencies(uint32_t newValue) {
cyclicModuleFields()->setPendingAsyncDependencies(newValue);
}
void ModuleObject::setCycleRoot(ModuleObject* cycleRoot) {
cyclicModuleFields()->cycleRoot = cycleRoot;
}
ModuleObject* ModuleObject::getCycleRoot() const {
MOZ_RELEASE_ASSERT(cyclicModuleFields()->cycleRoot);
return cyclicModuleFields()->cycleRoot;
}
bool ModuleObject::hasCycleRoot() const {
return bool(cyclicModuleFields()->cycleRoot);
}
LoadedModuleMap& ModuleObject::loadedModules() {
return cyclicModuleFields()->loadedModules;
}
const LoadedModuleMap& ModuleObject::loadedModules() const {
return cyclicModuleFields()->loadedModules;
}
bool ModuleObject::hasSyntheticModuleFields() const {
bool result = !getReservedSlot(SyntheticModuleFieldsSlot).isUndefined();
MOZ_ASSERT_IF(result, !hasCyclicModuleFields());
return result;
}
SyntheticModuleFields* ModuleObject::syntheticModuleFields() {
MOZ_ASSERT(!hasCyclicModuleFields());
void* ptr = getReservedSlot(SyntheticModuleFieldsSlot).toPrivate();
MOZ_ASSERT(ptr);
return static_cast<SyntheticModuleFields*>(ptr);
}
const SyntheticModuleFields* ModuleObject::syntheticModuleFields() const {
return const_cast<ModuleObject*>(this)->syntheticModuleFields();
}
bool ModuleObject::hasTopLevelCapability() const {
return cyclicModuleFields()->topLevelCapability;
}
bool ModuleObject::hadEvaluationError() const {
if (hasSyntheticModuleFields()) {
return false;
}
ModuleStatus fullStatus = cyclicModuleFields()->status;
return fullStatus == ModuleStatus::Evaluated_Error;
}
void ModuleObject::setEvaluationError(HandleValue newValue) {
MOZ_ASSERT(status() != ModuleStatus::Unlinked &&
status() != ModuleStatus::New);
MOZ_ASSERT(!hadEvaluationError());
cyclicModuleFields()->status = ModuleStatus::Evaluated_Error;
cyclicModuleFields()->evaluationError = newValue;
MOZ_ASSERT(status() == ModuleStatus::Evaluated);
MOZ_ASSERT(hadEvaluationError());
}
Value ModuleObject::maybeEvaluationError() const {
return cyclicModuleFields()->evaluationError;
}
Value ModuleObject::evaluationError() const {
MOZ_ASSERT(hadEvaluationError());
return maybeEvaluationError();
}
JSObject* ModuleObject::metaObject() const {
return cyclicModuleFields()->metaObject;
}
void ModuleObject::setMetaObject(JSObject* obj) {
MOZ_ASSERT(obj);
MOZ_ASSERT(!metaObject());
cyclicModuleFields()->metaObject = obj;
}
#ifdef DEBUG
void ModuleObject::setPreload(bool isPreload) {
setReservedSlot(PreloadSlot, BooleanValue(isPreload));
}
bool ModuleObject::isPreload() const {
return getReservedSlot(PreloadSlot).toBoolean();
}
#endif
/* static */
void ModuleObject::trace(JSTracer* trc, JSObject* obj) {
ModuleObject& module = obj->as<ModuleObject>();
if (module.hasCyclicModuleFields()) {
module.cyclicModuleFields()->trace(trc);
}
if (module.hasSyntheticModuleFields()) {
module.syntheticModuleFields()->trace(trc);
}
}
/* static */
bool ModuleObject::instantiateFunctionDeclarations(JSContext* cx,
Handle<ModuleObject*> self) {
#ifdef DEBUG
MOZ_ASSERT(self->status() == ModuleStatus::Linking);
if (!AssertFrozen(cx, self)) {
return false;
}
#endif
// |self| initially manages this vector.
UniquePtr<FunctionDeclarationVector>& funDecls =
self->cyclicModuleFields()->functionDeclarations;
if (!funDecls) {
JS_ReportErrorASCII(
cx, "Module function declarations have already been instantiated");
return false;
}
Rooted<ModuleEnvironmentObject*> env(cx, &self->initialEnvironment());
RootedObject obj(cx);
RootedValue value(cx);
RootedFunction fun(cx);
Rooted<PropertyName*> name(cx);
for (GCThingIndex funIndex : *funDecls) {
fun.set(self->script()->getFunction(funIndex));
obj = Lambda(cx, fun, env);
if (!obj) {
return false;
}
name = fun->fullExplicitName()->asPropertyName();
value = ObjectValue(*obj);
if (!SetProperty(cx, env, name, value)) {
return false;
}
}
// Free the vector, now its contents are no longer needed.
funDecls.reset();
return true;
}
/* static */
bool ModuleObject::execute(JSContext* cx, Handle<ModuleObject*> self) {
#ifdef DEBUG
MOZ_ASSERT(self->status() == ModuleStatus::Evaluating ||
self->status() == ModuleStatus::EvaluatingAsync ||
self->status() == ModuleStatus::Evaluated);
MOZ_ASSERT(!self->hadEvaluationError());
if (!AssertFrozen(cx, self)) {
return false;
}
#endif
RootedScript script(cx, self->script());
auto guardA = mozilla::MakeScopeExit([&] {
if (self->hasTopLevelAwait()) {
// Handled in AsyncModuleExecutionFulfilled and
// AsyncModuleExecutionRejected.
return;
}
ModuleObject::onTopLevelEvaluationFinished(self);
});
Rooted<ModuleEnvironmentObject*> env(cx, self->environment());
if (!env) {
JS_ReportErrorASCII(cx,
"Module declarations have not yet been instantiated");
return false;
}
Rooted<Value> ignored(cx);
return Execute(cx, script, env, &ignored);
}
/* static */
void ModuleObject::onTopLevelEvaluationFinished(ModuleObject* module) {
// ScriptSlot is used by debugger to access environments during evaluating
// the top-level script.
// Clear the reference at exit to prevent us keeping this alive unnecessarily.
module->setReservedSlot(ScriptSlot, UndefinedValue());
}
/* static */
ModuleNamespaceObject* ModuleObject::createNamespace(
JSContext* cx, Handle<ModuleObject*> self,
MutableHandle<UniquePtr<ExportNameVector>> exports) {
MOZ_ASSERT(!self->namespace_());
Rooted<UniquePtr<IndirectBindingMap>> bindings(cx);
bindings = cx->make_unique<IndirectBindingMap>();
if (!bindings) {
return nullptr;
}
auto* ns = ModuleNamespaceObject::create(cx, self, exports, &bindings);
if (!ns) {
return nullptr;
}
self->initReservedSlot(NamespaceSlot, ObjectValue(*ns));
return ns;
}
/* static */
bool ModuleObject::createEnvironment(JSContext* cx,
Handle<ModuleObject*> self) {
Rooted<ModuleEnvironmentObject*> env(
cx, ModuleEnvironmentObject::create(cx, self));
if (!env) {
return false;
}
self->setInitialEnvironment(env);
return true;
}
/*static*/
bool ModuleObject::createSyntheticEnvironment(JSContext* cx,
Handle<ModuleObject*> self,
JS::HandleVector<Value> values) {
Rooted<ModuleEnvironmentObject*> env(
cx, ModuleEnvironmentObject::createSynthetic(cx, self));
if (!env) {
return false;
}
// We expect one property per synthetic value plus one for the *namespace*
// binding.
MOZ_ASSERT(env->shape()->propMapLength() == values.length() + 1);
for (uint32_t i = 0; i < values.length(); i++) {
env->setAliasedBinding(env->firstSyntheticValueSlot() + i, values[i]);
}
self->setInitialEnvironment(env);
return true;
}
/* static */
bool ModuleObject::createWasmEnvironment(JSContext* cx,
Handle<ModuleObject*> self) {
Rooted<ModuleEnvironmentObject*> env(
cx, ModuleEnvironmentObject::createForWasmModule(cx, self));
if (!env) {
return false;
}
self->setInitialEnvironment(env);
return true;
}
///////////////////////////////////////////////////////////////////////////
// GraphLoadingStateRecordObject
GraphLoadingStateRecord::GraphLoadingStateRecord(
JS::LoadModuleResolvedCallback resolved,
JS::LoadModuleRejectedCallback rejected)
: resolved(resolved), rejected(rejected) {}
void GraphLoadingStateRecord::trace(JSTracer* trc) { visited.trace(trc); }
/* static */
const JSClass GraphLoadingStateRecordObject::class_ = {
"GraphLoadingStateRecordObject",
JSCLASS_HAS_RESERVED_SLOTS(GraphLoadingStateRecordObject::SlotCount) |
JSCLASS_BACKGROUND_FINALIZE,
&GraphLoadingStateRecordObject::classOps_,
};
static_assert(GraphLoadingStateRecordObject::StateSlot == 0);
/* static */
const JSClassOps GraphLoadingStateRecordObject::classOps_ = {
.finalize = GraphLoadingStateRecordObject::finalize,
.trace = GraphLoadingStateRecordObject::trace,
};
/* static */
GraphLoadingStateRecordObject* GraphLoadingStateRecordObject::create(
JSContext* cx, bool isLoading, uint32_t pendingModulesCount,
JS::LoadModuleResolvedCallback resolved,
JS::LoadModuleRejectedCallback rejected, Handle<Value> hostDefined) {
Rooted<GraphLoadingStateRecordObject*> self(
cx, NewObjectWithGivenProto<GraphLoadingStateRecordObject>(cx, nullptr));
if (!self) {
return nullptr;
}
auto* state = cx->new_<GraphLoadingStateRecord>(resolved, rejected);
if (!state) {
ReportOutOfMemory(cx);
return nullptr;
}
InitReservedSlot(self, StateSlot, state, MemoryUse::GraphLoadingStateRecord);
self->initReservedSlot(IsLoadingSlot, Int32Value(isLoading));
self->initReservedSlot(PendingModulesCountSlot,
Int32Value(pendingModulesCount));
self->initReservedSlot(HostDefinedSlot, hostDefined);
return self;
}
/* static */
GraphLoadingStateRecordObject* GraphLoadingStateRecordObject::create(
JSContext* cx, bool isLoading, uint32_t pendingModulesCount,
Handle<PromiseObject*> promise, Handle<Value> hostDefined) {
Rooted<GraphLoadingStateRecordObject*> self(
cx, NewObjectWithGivenProto<GraphLoadingStateRecordObject>(cx, nullptr));
if (!self) {
return nullptr;
}
auto* state = cx->new_<GraphLoadingStateRecord>();
if (!state) {
ReportOutOfMemory(cx);
return nullptr;
}
InitReservedSlot(self, StateSlot, state, MemoryUse::GraphLoadingStateRecord);
self->initReservedSlot(PromiseSlot, ObjectValue(*promise));
self->initReservedSlot(IsLoadingSlot, Int32Value(isLoading));
self->initReservedSlot(PendingModulesCountSlot,
Int32Value(pendingModulesCount));
self->initReservedSlot(HostDefinedSlot, hostDefined);
return self;
}
VisitedModuleSet& GraphLoadingStateRecordObject::visited() {
GraphLoadingStateRecord* state = static_cast<GraphLoadingStateRecord*>(
getReservedSlot(StateSlot).toPrivate());
MOZ_ASSERT(state);
return state->visited;
}
PromiseObject* GraphLoadingStateRecordObject::promise() {
if (getReservedSlot(PromiseSlot).isUndefined()) {
return nullptr;
}
return &getReservedSlot(PromiseSlot).toObject().as<PromiseObject>();
}
bool GraphLoadingStateRecordObject::isLoading() {
return getReservedSlot(IsLoadingSlot).toInt32();
}
void GraphLoadingStateRecordObject::setIsLoading(bool isLoading) {
setReservedSlot(IsLoadingSlot, Int32Value(isLoading));
}
uint32_t GraphLoadingStateRecordObject::pendingModulesCount() {
return getReservedSlot(PendingModulesCountSlot).toInt32();
}
void GraphLoadingStateRecordObject::setPendingModulesCount(uint32_t count) {
setReservedSlot(PendingModulesCountSlot, Int32Value(count));
}
Value GraphLoadingStateRecordObject::hostDefined() {
return getReservedSlot(HostDefinedSlot);
}
bool GraphLoadingStateRecordObject::resolved(
JSContext* cx, JS::Handle<JS::Value> hostDefined) {
if (promise()) {
Rooted<PromiseObject*> promiseObj(cx, promise());
return AsyncFunctionReturned(cx, promiseObj, UndefinedHandleValue);
}
GraphLoadingStateRecord* state = static_cast<GraphLoadingStateRecord*>(
getReservedSlot(StateSlot).toPrivate());
MOZ_ASSERT(state);
MOZ_ASSERT(state->resolved);
return state->resolved(cx, hostDefined);
}
bool GraphLoadingStateRecordObject::rejected(JSContext* cx,
JS::Handle<JS::Value> hostDefined,
Handle<JS::Value> error) {
if (promise()) {
Rooted<PromiseObject*> promiseObj(cx, promise());
return AsyncFunctionThrown(cx, promiseObj, error);
}
GraphLoadingStateRecord* state = static_cast<GraphLoadingStateRecord*>(
getReservedSlot(StateSlot).toPrivate());
MOZ_ASSERT(state);
MOZ_ASSERT(state->rejected);
return state->rejected(cx, hostDefined, error);
}
/* static */
void GraphLoadingStateRecordObject::finalize(JS::GCContext* gcx,
JSObject* obj) {
auto* self = &obj->as<GraphLoadingStateRecordObject>();
Value stateValue = self->getReservedSlot(StateSlot);
if (!stateValue.isUndefined()) {
auto* state = static_cast<GraphLoadingStateRecord*>(stateValue.toPrivate());
gcx->delete_(obj, state, MemoryUse::GraphLoadingStateRecord);
}
}
/* static */
void GraphLoadingStateRecordObject::trace(JSTracer* trc, JSObject* obj) {
GraphLoadingStateRecordObject* self =
&obj->as<GraphLoadingStateRecordObject>();
Value stateValue = self->getReservedSlot(StateSlot);
if (!stateValue.isUndefined()) {
GraphLoadingStateRecord* state =
static_cast<GraphLoadingStateRecord*>(stateValue.toPrivate());
state->trace(trc);
}
}
///////////////////////////////////////////////////////////////////////////
// ModuleBuilder
ModuleBuilder::ModuleBuilder(FrontendContext* fc,
const frontend::EitherParser& eitherParser)
: fc_(fc),
eitherParser_(eitherParser),
requestedModuleIndexes_(fc),
importEntries_(fc),
exportEntries_(fc),
exportNames_(fc) {}
bool ModuleBuilder::noteFunctionDeclaration(FrontendContext* fc,
uint32_t funIndex) {
if (!functionDecls_.emplaceBack(funIndex)) {
js::ReportOutOfMemory(fc);
return false;
}
return true;
}
void ModuleBuilder::noteAsync(frontend::StencilModuleMetadata& metadata) {
metadata.isAsync = true;
}
bool ModuleBuilder::buildTables(frontend::StencilModuleMetadata& metadata) {
// 15.2.1.17.1 ParseModule, Steps 4-11.
// Step 4.
metadata.moduleRequests = std::move(moduleRequests_);
metadata.requestedModules = std::move(requestedModules_);
// Step 5.
if (!metadata.importEntries.reserve(importEntries_.count())) {
js::ReportOutOfMemory(fc_);
return false;
}
for (auto iter = importEntries_.iter(); !iter.done(); iter.next()) {
frontend::StencilModuleEntry& entry = iter.get().value();
metadata.importEntries.infallibleAppend(entry);
}
// Steps 6-11.
for (const frontend::StencilModuleEntry& exp : exportEntries_) {
if (!exp.moduleRequest) {
frontend::StencilModuleEntry* importEntry = importEntryFor(exp.localName);
if (!importEntry) {
if (!metadata.localExportEntries.append(exp)) {
js::ReportOutOfMemory(fc_);
return false;
}
} else {
// All names should have already been marked as used-by-stencil.
bool isSourcePhase =
metadata.moduleRequests[importEntry->moduleRequest.value()].phase ==
ImportPhase::Source;
if (isSourcePhase) {
// A source-phase import binds the module-source object as a local
// lexical, so re-exporting it is a local export.
if (!metadata.localExportEntries.append(exp)) {
js::ReportOutOfMemory(fc_);
return false;
}
} else if (!importEntry->importName) {
// This is a re-export of an imported module namespace object.
auto entry = frontend::StencilModuleEntry::exportNamespaceFromEntry(
importEntry->moduleRequest, exp.exportName, exp.lineno,
exp.column);
if (!metadata.indirectExportEntries.append(entry)) {
js::ReportOutOfMemory(fc_);
return false;
}
} else {
auto entry = frontend::StencilModuleEntry::exportFromEntry(
importEntry->moduleRequest, importEntry->importName,
exp.exportName, exp.lineno, exp.column);
if (!metadata.indirectExportEntries.append(entry)) {
js::ReportOutOfMemory(fc_);
return false;
}
}
}
} else if (!exp.importName && !exp.exportName) {
if (!metadata.starExportEntries.append(exp)) {
js::ReportOutOfMemory(fc_);
return false;
}
} else {
if (!metadata.indirectExportEntries.append(exp)) {
js::ReportOutOfMemory(fc_);
return false;
}
}
}
return true;
}
void ModuleBuilder::finishFunctionDecls(
frontend::StencilModuleMetadata& metadata) {
metadata.functionDecls = std::move(functionDecls_);
}
bool frontend::StencilModuleMetadata::createModuleRequestObjects(
JSContext* cx, CompilationAtomCache& atomCache,
MutableHandle<ModuleRequestVector> output) const {
if (!output.reserve(moduleRequests.length())) {
ReportOutOfMemory(cx);
return false;
}
Rooted<ModuleRequestObject*> object(cx);
for (const StencilModuleRequest& request : moduleRequests) {
object = createModuleRequestObject(cx, atomCache, request);
if (!object) {
return false;
}
output.infallibleEmplaceBack(object);
}
return true;
}
ModuleRequestObject* frontend::StencilModuleMetadata::createModuleRequestObject(
JSContext* cx, CompilationAtomCache& atomCache,
const StencilModuleRequest& request) const {
uint32_t numberOfAttributes = request.attributes.length();
Rooted<ImportAttributeVector> attributes(cx);
if (numberOfAttributes > 0) {
if (!attributes.reserve(numberOfAttributes)) {
ReportOutOfMemory(cx);
return nullptr;
}
Rooted<JSAtom*> attributeKey(cx);
Rooted<JSAtom*> attributeValue(cx);
for (uint32_t j = 0; j < numberOfAttributes; ++j) {
attributeKey = atomCache.getExistingAtomAt(cx, request.attributes[j].key);
attributeValue =
atomCache.getExistingAtomAt(cx, request.attributes[j].value);
attributes.infallibleEmplaceBack(attributeKey, attributeValue);
}
}
Rooted<JSAtom*> specifier(cx,
atomCache.getExistingAtomAt(cx, request.specifier));
MOZ_ASSERT(specifier);
Rooted<ModuleRequestObject*> moduleRequestObject(
cx,
ModuleRequestObject::create(cx, specifier, attributes, request.phase));
if (!moduleRequestObject) {
return nullptr;
}
if (request.firstUnsupportedAttributeKey) {
Rooted<JSAtom*> unsupportedAttributeKey(
cx,
atomCache.getExistingAtomAt(cx, request.firstUnsupportedAttributeKey));
moduleRequestObject->setFirstUnsupportedAttributeKey(
unsupportedAttributeKey);
}
return moduleRequestObject;
}
bool frontend::StencilModuleMetadata::createImportEntries(
JSContext* cx, CompilationAtomCache& atomCache,
Handle<ModuleRequestVector> moduleRequests,
MutableHandle<ImportEntryVector> output) const {
if (!output.reserve(importEntries.length())) {
ReportOutOfMemory(cx);
return false;
}
for (const StencilModuleEntry& entry : importEntries) {
Rooted<ModuleRequestObject*> moduleRequest(cx);
moduleRequest = moduleRequests[entry.moduleRequest.value()].get();
MOZ_ASSERT(moduleRequest);
Rooted<JSAtom*> localName(cx);
if (entry.localName) {
localName = atomCache.getExistingAtomAt(cx, entry.localName);
MOZ_ASSERT(localName);
}
Rooted<JSAtom*> importName(cx);
if (entry.importName) {
importName = atomCache.getExistingAtomAt(cx, entry.importName);
MOZ_ASSERT(importName);
}
MOZ_ASSERT(!entry.exportName);
output.infallibleEmplaceBack(moduleRequest, importName, localName,
entry.lineno, entry.column);
}
return true;
}
bool frontend::StencilModuleMetadata::createExportEntries(
JSContext* cx, frontend::CompilationAtomCache& atomCache,
Handle<ModuleRequestVector> moduleRequests,
const frontend::StencilModuleMetadata::EntryVector& input,
MutableHandle<ExportEntryVector> output) const {
if (!output.reserve(output.length() + input.length())) {
ReportOutOfMemory(cx);
return false;
}
for (const frontend::StencilModuleEntry& entry : input) {
Rooted<JSAtom*> exportName(cx);
if (entry.exportName) {
exportName = atomCache.getExistingAtomAt(cx, entry.exportName);
MOZ_ASSERT(exportName);
}
Rooted<ModuleRequestObject*> moduleRequestObject(cx);
if (entry.moduleRequest) {
moduleRequestObject = moduleRequests[entry.moduleRequest.value()].get();
MOZ_ASSERT(moduleRequestObject);
}
Rooted<JSAtom*> localName(cx);
if (entry.localName) {
localName = atomCache.getExistingAtomAt(cx, entry.localName);
MOZ_ASSERT(localName);
}
Rooted<JSAtom*> importName(cx);
if (entry.importName) {
importName = atomCache.getExistingAtomAt(cx, entry.importName);
MOZ_ASSERT(importName);
}
output.infallibleEmplaceBack(exportName, moduleRequestObject, importName,
localName, entry.lineno, entry.column);
}
return true;
}
bool frontend::StencilModuleMetadata::createRequestedModules(
JSContext* cx, CompilationAtomCache& atomCache,
Handle<ModuleRequestVector> moduleRequests,
MutableHandle<RequestedModuleVector> output) const {
if (!output.reserve(requestedModules.length())) {
ReportOutOfMemory(cx);
return false;
}
for (const frontend::StencilModuleEntry& entry : requestedModules) {
Rooted<ModuleRequestObject*> moduleRequest(cx);
moduleRequest = moduleRequests[entry.moduleRequest.value()].get();
MOZ_ASSERT(moduleRequest);
MOZ_ASSERT(!entry.localName);
MOZ_ASSERT(!entry.importName);
MOZ_ASSERT(!entry.exportName);
output.infallibleEmplaceBack(moduleRequest, entry.lineno, entry.column);
}
return true;
}
// Use StencilModuleMetadata data to fill in ModuleObject
bool frontend::StencilModuleMetadata::initModule(
JSContext* cx, FrontendContext* fc,
frontend::CompilationAtomCache& atomCache,
JS::Handle<ModuleObject*> module) const {
Rooted<ModuleRequestVector> moduleRequestsVector(cx);
if (!createModuleRequestObjects(cx, atomCache, &moduleRequestsVector)) {
return false;
}
Rooted<RequestedModuleVector> requestedModulesVector(cx);
if (!createRequestedModules(cx, atomCache, moduleRequestsVector,
&requestedModulesVector)) {
return false;
}
Rooted<ImportEntryVector> importEntriesVector(cx);
if (!createImportEntries(cx, atomCache, moduleRequestsVector,
&importEntriesVector)) {
return false;
}
Rooted<ExportEntryVector> exportEntriesVector(cx);
if (!createExportEntries(cx, atomCache, moduleRequestsVector,
localExportEntries, &exportEntriesVector)) {
return false;
}
if (!createExportEntries(cx, atomCache, moduleRequestsVector,
indirectExportEntries, &exportEntriesVector)) {
return false;
}
if (!createExportEntries(cx, atomCache, moduleRequestsVector,
starExportEntries, &exportEntriesVector)) {
return false;
}
// Copy the vector of declarations to the ModuleObject.
auto functionDeclsCopy = MakeUnique<FunctionDeclarationVector>();
if (!functionDeclsCopy || !functionDeclsCopy->appendAll(functionDecls)) {
js::ReportOutOfMemory(fc);
return false;
}
module->initFunctionDeclarations(std::move(functionDeclsCopy));
Rooted<ListObject*> asyncParentModulesList(cx, ListObject::create(cx));
if (!asyncParentModulesList) {
return false;
}
module->initAsyncSlots(cx, isAsync, asyncParentModulesList);
module->initImportExportData(
&requestedModulesVector, &importEntriesVector, &exportEntriesVector,
localExportEntries.length(), indirectExportEntries.length(),
starExportEntries.length());
return true;
}
bool ModuleBuilder::processAttributes(frontend::StencilModuleRequest& request,
frontend::ListNode* attributeList) {
using namespace js::frontend;
for (ParseNode* attributeItem : attributeList->contents()) {
BinaryNode* attribute = &attributeItem->as<BinaryNode>();
MOZ_ASSERT(attribute->isKind(ParseNodeKind::ImportAttribute));
auto key = attribute->left()->as<NameNode>().atom();
markUsedByStencil(key);
// Note: This should be driven by a host hook
// (HostGetSupportedImportAttributes), however the infrastructure of said
// host hook is deeply unclear, and so right now embedders will not have
// the ability to alter or extend the set of supported attributes.
if (key == TaggedParserAtomIndex::WellKnown::type()) {
auto value = attribute->right()->as<NameNode>().atom();
markUsedByStencil(value);
StencilModuleImportAttribute attributeStencil(key, value);
if (!request.attributes.append(attributeStencil)) {
js::ReportOutOfMemory(fc_);
return false;
}
} else {
if (!request.firstUnsupportedAttributeKey) {
request.firstUnsupportedAttributeKey = key;
}
}
}
return true;
}
bool ModuleBuilder::processImport(frontend::BinaryNode* importNode) {
using namespace js::frontend;
MOZ_ASSERT(importNode->isKind(ParseNodeKind::ImportDecl) ||
importNode->isKind(ParseNodeKind::ImportSourceDecl));
auto* moduleRequest = &importNode->right()->as<BinaryNode>();
MOZ_ASSERT(moduleRequest->isKind(ParseNodeKind::ImportModuleRequest));
auto* moduleSpec = &moduleRequest->left()->as<NameNode>();
MOZ_ASSERT(moduleSpec->isKind(ParseNodeKind::StringExpr));
auto specifier = moduleSpec->atom();
if (importNode->isKind(ParseNodeKind::ImportSourceDecl)) {
auto* localNameNode = &importNode->left()->as<NameNode>();
MOZ_ASSERT(localNameNode->isKind(ParseNodeKind::Name));
MaybeModuleRequestIndex moduleRequestIndex =
appendModuleRequest(specifier, nullptr, ImportPhase::Source);
if (!moduleRequestIndex.isSome()) {
return false;
}
if (!maybeAppendRequestedModule(moduleRequestIndex, moduleSpec)) {
return false;
}
auto localName = localNameNode->atom();
markUsedByStencil(localName);
uint32_t line;
JS::LimitedColumnNumberOneOrigin column;
eitherParser_.computeLineAndColumn(localNameNode->pn_pos.begin, &line,
&column);
auto entry = StencilModuleEntry::importNamespaceEntry(
moduleRequestIndex, localName, line, JS::ColumnNumberOneOrigin(column));
return importEntries_.put(localName, entry);
}
auto* specList = &importNode->left()->as<ListNode>();
MOZ_ASSERT(specList->isKind(ParseNodeKind::ImportSpecList));
auto* attributeList = &moduleRequest->right()->as<ListNode>();
MOZ_ASSERT(attributeList->isKind(ParseNodeKind::ImportAttributeList));
MaybeModuleRequestIndex moduleRequestIndex =
appendModuleRequest(specifier, attributeList);
if (!moduleRequestIndex.isSome()) {
return false;
}
if (!maybeAppendRequestedModule(moduleRequestIndex, moduleSpec)) {
return false;
}
for (ParseNode* item : specList->contents()) {
uint32_t line;
JS::LimitedColumnNumberOneOrigin column;
eitherParser_.computeLineAndColumn(item->pn_pos.begin, &line, &column);
StencilModuleEntry entry;
TaggedParserAtomIndex localName;
if (item->isKind(ParseNodeKind::ImportSpec)) {
auto* spec = &item->as<BinaryNode>();
auto* importNameNode = &spec->left()->as<NameNode>();
auto* localNameNode = &spec->right()->as<NameNode>();
auto importName = importNameNode->atom();
localName = localNameNode->atom();
markUsedByStencil(localName);
markUsedByStencil(importName);
entry = StencilModuleEntry::importEntry(
moduleRequestIndex, localName, importName, line,
JS::ColumnNumberOneOrigin(column));
} else {
MOZ_ASSERT(item->isKind(ParseNodeKind::ImportNamespaceSpec));
auto* spec = &item->as<UnaryNode>();
auto* localNameNode = &spec->kid()->as<NameNode>();
localName = localNameNode->atom();
markUsedByStencil(localName);
entry = StencilModuleEntry::importNamespaceEntry(
moduleRequestIndex, localName, line,
JS::ColumnNumberOneOrigin(column));
}
if (!importEntries_.put(localName, entry)) {
return false;
}
}
return true;
}
bool ModuleBuilder::processExport(frontend::ParseNode* exportNode) {
using namespace js::frontend;
MOZ_ASSERT(exportNode->isKind(ParseNodeKind::ExportStmt) ||
exportNode->isKind(ParseNodeKind::ExportDefaultStmt));
bool isDefault = exportNode->isKind(ParseNodeKind::ExportDefaultStmt);
ParseNode* kid = isDefault ? exportNode->as<BinaryNode>().left()
: exportNode->as<UnaryNode>().kid();
if (isDefault && exportNode->as<BinaryNode>().right()) {
// This is an export default containing an expression.
auto localName = TaggedParserAtomIndex::WellKnown::default_();
auto exportName = TaggedParserAtomIndex::WellKnown::default_();
return appendExportEntry(exportName, localName);
}
switch (kid->getKind()) {
case ParseNodeKind::ExportSpecList: {
MOZ_ASSERT(!isDefault);
for (ParseNode* item : kid->as<ListNode>().contents()) {
BinaryNode* spec = &item->as<BinaryNode>();
MOZ_ASSERT(spec->isKind(ParseNodeKind::ExportSpec));
NameNode* localNameNode = &spec->left()->as<NameNode>();
NameNode* exportNameNode = &spec->right()->as<NameNode>();
auto localName = localNameNode->atom();
auto exportName = exportNameNode->atom();
if (!appendExportEntry(exportName, localName, spec)) {
return false;
}
}
break;
}
case ParseNodeKind::ClassDecl: {
const ClassNode& cls = kid->as<ClassNode>();
MOZ_ASSERT(cls.names());
auto localName = cls.names()->innerBinding()->atom();
auto exportName =
isDefault ? TaggedParserAtomIndex::WellKnown::default_() : localName;
if (!appendExportEntry(exportName, localName)) {
return false;
}
break;
}
case ParseNodeKind::VarStmt:
case ParseNodeKind::ConstDecl:
case ParseNodeKind::LetDecl: {
for (ParseNode* binding : kid->as<ListNode>().contents()) {
if (binding->isKind(ParseNodeKind::AssignExpr)) {
binding = binding->as<AssignmentNode>().left();
} else {
MOZ_ASSERT(binding->isKind(ParseNodeKind::Name));
}
if (binding->isKind(ParseNodeKind::Name)) {
auto localName = binding->as<NameNode>().atom();
auto exportName = isDefault
? TaggedParserAtomIndex::WellKnown::default_()
: localName;
if (!appendExportEntry(exportName, localName)) {
return false;
}
} else if (binding->isKind(ParseNodeKind::ArrayExpr)) {
if (!processExportArrayBinding(&binding->as<ListNode>())) {
return false;
}
} else {
MOZ_ASSERT(binding->isKind(ParseNodeKind::ObjectExpr));
if (!processExportObjectBinding(&binding->as<ListNode>())) {
return false;
}
}
}
break;
}
case ParseNodeKind::Function: {
FunctionBox* box = kid->as<FunctionNode>().funbox();
MOZ_ASSERT(!box->isArrow());
auto localName = box->explicitName();
auto exportName =
isDefault ? TaggedParserAtomIndex::WellKnown::default_() : localName;
if (!appendExportEntry(exportName, localName)) {
return false;
}
break;
}
default:
MOZ_CRASH("Unexpected parse node");
}
return true;
}
bool ModuleBuilder::processExportBinding(frontend::ParseNode* binding) {
using namespace js::frontend;
if (binding->isKind(ParseNodeKind::Name)) {
auto name = binding->as<NameNode>().atom();
return appendExportEntry(name, name);
}
if (binding->isKind(ParseNodeKind::ArrayExpr)) {
return processExportArrayBinding(&binding->as<ListNode>());
}
MOZ_ASSERT(binding->isKind(ParseNodeKind::ObjectExpr));
return processExportObjectBinding(&binding->as<ListNode>());
}
bool ModuleBuilder::processExportArrayBinding(frontend::ListNode* array) {
using namespace js::frontend;
MOZ_ASSERT(array->isKind(ParseNodeKind::ArrayExpr));
for (ParseNode* node : array->contents()) {
if (node->isKind(ParseNodeKind::Elision)) {
continue;
}
if (node->isKind(ParseNodeKind::Spread)) {
node = node->as<UnaryNode>().kid();
} else if (node->isKind(ParseNodeKind::AssignExpr)) {
node = node->as<AssignmentNode>().left();
}
if (!processExportBinding(node)) {
return false;
}
}
return true;
}
bool ModuleBuilder::processExportObjectBinding(frontend::ListNode* obj) {
using namespace js::frontend;
MOZ_ASSERT(obj->isKind(ParseNodeKind::ObjectExpr));
for (ParseNode* node : obj->contents()) {
MOZ_ASSERT(node->isKind(ParseNodeKind::MutateProto) ||
node->isKind(ParseNodeKind::PropertyDefinition) ||
node->isKind(ParseNodeKind::Shorthand) ||
node->isKind(ParseNodeKind::Spread));
ParseNode* target;
if (node->isKind(ParseNodeKind::Spread)) {
target = node->as<UnaryNode>().kid();
} else {
if (node->isKind(ParseNodeKind::MutateProto)) {
target = node->as<UnaryNode>().kid();
} else {
target = node->as<BinaryNode>().right();
}
if (target->isKind(ParseNodeKind::AssignExpr)) {
target = target->as<AssignmentNode>().left();
}
}
if (!processExportBinding(target)) {
return false;
}
}
return true;
}
bool ModuleBuilder::processExportFrom(frontend::BinaryNode* exportNode) {
using namespace js::frontend;
MOZ_ASSERT(exportNode->isKind(ParseNodeKind::ExportFromStmt));
auto* specList = &exportNode->left()->as<ListNode>();
MOZ_ASSERT(specList->isKind(ParseNodeKind::ExportSpecList));
auto* moduleRequest = &exportNode->right()->as<BinaryNode>();
MOZ_ASSERT(moduleRequest->isKind(ParseNodeKind::ImportModuleRequest));
auto* moduleSpec = &moduleRequest->left()->as<NameNode>();
MOZ_ASSERT(moduleSpec->isKind(ParseNodeKind::StringExpr));
auto* attributeList = &moduleRequest->right()->as<ListNode>();
MOZ_ASSERT(attributeList->isKind(ParseNodeKind::ImportAttributeList));
auto specifier = moduleSpec->atom();
MaybeModuleRequestIndex moduleRequestIndex =
appendModuleRequest(specifier, attributeList);
if (!moduleRequestIndex.isSome()) {
return false;
}
if (!maybeAppendRequestedModule(moduleRequestIndex, moduleSpec)) {
return false;
}
for (ParseNode* spec : specList->contents()) {
uint32_t line;
JS::LimitedColumnNumberOneOrigin column;
eitherParser_.computeLineAndColumn(spec->pn_pos.begin, &line, &column);
StencilModuleEntry entry;
if (spec->isKind(ParseNodeKind::ExportSpec)) {
auto* importNameNode = &spec->as<BinaryNode>().left()->as<NameNode>();
auto* exportNameNode = &spec->as<BinaryNode>().right()->as<NameNode>();
auto importName = importNameNode->atom();
auto exportName = exportNameNode->atom();
MOZ_ASSERT(exportNames_.has(exportName));
markUsedByStencil(importName);
markUsedByStencil(exportName);
entry = StencilModuleEntry::exportFromEntry(
moduleRequestIndex, importName, exportName, line,
JS::ColumnNumberOneOrigin(column));
} else if (spec->isKind(ParseNodeKind::ExportNamespaceSpec)) {
auto* exportNameNode = &spec->as<UnaryNode>().kid()->as<NameNode>();
auto exportName = exportNameNode->atom();
MOZ_ASSERT(exportNames_.has(exportName));
markUsedByStencil(exportName);
entry = StencilModuleEntry::exportNamespaceFromEntry(
moduleRequestIndex, exportName, line,
JS::ColumnNumberOneOrigin(column));
} else {
MOZ_ASSERT(spec->isKind(ParseNodeKind::ExportBatchSpecStmt));
entry = StencilModuleEntry::exportBatchFromEntry(
moduleRequestIndex, line, JS::ColumnNumberOneOrigin(column));
}
if (!exportEntries_.append(entry)) {
return false;
}
}
return true;
}
frontend::StencilModuleEntry* ModuleBuilder::importEntryFor(
frontend::TaggedParserAtomIndex localName) const {
MOZ_ASSERT(localName);
auto ptr = importEntries_.lookup(localName);
if (!ptr) {
return nullptr;
}
return &ptr->value();
}
ModuleBuilder::NoteExportedNameResult ModuleBuilder::noteExportedName(
frontend::TaggedParserAtomIndex name) {
MOZ_ASSERT(name);
auto addPtr = exportNames_.lookupForAdd(name);
if (addPtr) {
return NoteExportedNameResult::AlreadyDeclared;
}
if (!exportNames_.add(addPtr, name)) {
return NoteExportedNameResult::OutOfMemory;
}
return NoteExportedNameResult::Success;
}
bool ModuleBuilder::appendExportEntry(
frontend::TaggedParserAtomIndex exportName,
frontend::TaggedParserAtomIndex localName, frontend::ParseNode* node) {
MOZ_ASSERT(exportNames_.has(exportName));
uint32_t line = 0;
JS::LimitedColumnNumberOneOrigin column;
if (node) {
eitherParser_.computeLineAndColumn(node->pn_pos.begin, &line, &column);
}
markUsedByStencil(localName);
markUsedByStencil(exportName);
auto entry = frontend::StencilModuleEntry::exportAsEntry(
localName, exportName, line, JS::ColumnNumberOneOrigin(column));
return exportEntries_.append(entry);
}
frontend::MaybeModuleRequestIndex ModuleBuilder::appendModuleRequest(
frontend::TaggedParserAtomIndex specifier,
frontend::ListNode* attributeList, ImportPhase phase) {
markUsedByStencil(specifier);
auto request = frontend::StencilModuleRequest(specifier);
request.phase = phase;
if (phase == ImportPhase::Evaluation) {
if (!processAttributes(request, attributeList)) {
return MaybeModuleRequestIndex();
}
}
if (auto ptr = moduleRequestIndexes_.lookup(request)) {
return MaybeModuleRequestIndex(ptr->value());
}
uint32_t index = moduleRequests_.length();
if (!moduleRequests_.append(request) ||
!moduleRequestIndexes_.put(request, index)) {
js::ReportOutOfMemory(fc_);
return MaybeModuleRequestIndex();
}
return MaybeModuleRequestIndex(index);
}
bool ModuleBuilder::maybeAppendRequestedModule(
MaybeModuleRequestIndex moduleRequest, frontend::ParseNode* node) {
uint32_t index = moduleRequest.value();
if (requestedModuleIndexes_.has(index)) {
return true;
}
uint32_t line;
JS::LimitedColumnNumberOneOrigin column;
eitherParser_.computeLineAndColumn(node->pn_pos.begin, &line, &column);
auto entry = frontend::StencilModuleEntry::requestedModule(
moduleRequest, line, JS::ColumnNumberOneOrigin(column));
if (!requestedModules_.append(entry)) {
js::ReportOutOfMemory(fc_);
return false;
}
return requestedModuleIndexes_.put(index);
}
void ModuleBuilder::markUsedByStencil(frontend::TaggedParserAtomIndex name) {
// Imported/exported identifiers must be atomized.
eitherParser_.parserAtoms().markUsedByStencil(
name, frontend::ParserAtom::Atomize::Yes);
}
JSObject* js::GetOrCreateModuleMetaObject(JSContext* cx,
HandleObject moduleArg) {
Handle<ModuleObject*> module = moduleArg.as<ModuleObject>();
if (JSObject* obj = module->metaObject()) {
return obj;
}
RootedObject metaObject(cx, NewPlainObjectWithProto(cx, nullptr));
if (!metaObject) {
return nullptr;
}
JS::ModuleMetadataHook func = cx->runtime()->moduleMetadataHook;
if (!func) {
JS_ReportErrorASCII(cx, "Module metadata hook not set");
return nullptr;
}
if (!func(cx, module, metaObject)) {
return nullptr;
}
module->setMetaObject(metaObject);
return metaObject;
}
bool ModuleObject::topLevelCapabilityResolve(JSContext* cx,
Handle<ModuleObject*> module) {
RootedValue rval(cx);
Rooted<PromiseObject*> promise(cx, module->topLevelCapability());
return AsyncFunctionReturned(cx, promise, rval);
}
bool ModuleObject::topLevelCapabilityReject(JSContext* cx,
Handle<ModuleObject*> module,
HandleValue error) {
Rooted<PromiseObject*> promise(cx, module->topLevelCapability());
return AsyncFunctionThrown(cx, promise, error);
}