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ModuleLoaderBase.cpp
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "GeckoProfiler.h"
#include "LoadedScript.h"
#include "ModuleLoadRequest.h"
#include "ScriptLoadRequest.h"
#include "mozilla/dom/ScriptSettings.h" // AutoJSAPI
#include "mozilla/dom/ScriptTrace.h"
#include "js/Array.h" // JS::GetArrayLength
#include "js/CompilationAndEvaluation.h"
#include "js/ContextOptions.h" // JS::ContextOptionsRef
#include "js/friend/ErrorMessages.h" // js::GetErrorMessage, JSMSG_*
#include "js/Modules.h" // JS::FinishDynamicModuleImport, JS::{G,S}etModuleResolveHook, JS::Get{ModulePrivate,ModuleScript,RequestedModule{s,Specifier,SourcePos}}, JS::SetModule{DynamicImport,Metadata}Hook
#include "js/OffThreadScriptCompilation.h"
#include "js/PropertyAndElement.h" // JS_DefineProperty, JS_GetElement
#include "js/SourceText.h"
#include "mozilla/BasePrincipal.h"
#include "mozilla/dom/AutoEntryScript.h"
#include "mozilla/dom/ScriptLoadContext.h"
#include "mozilla/CycleCollectedJSContext.h" // nsAutoMicroTask
#include "mozilla/Preferences.h"
#include "mozilla/StaticPrefs_dom.h"
#include "nsContentUtils.h"
#include "nsICacheInfoChannel.h" // nsICacheInfoChannel
#include "nsNetUtil.h" // NS_NewURI
#include "xpcpublic.h"
using mozilla::Err;
using mozilla::Preferences;
using mozilla::UniquePtr;
using mozilla::WrapNotNull;
using mozilla::dom::AutoJSAPI;
namespace JS::loader {
mozilla::LazyLogModule ModuleLoaderBase::gCspPRLog("CSP");
mozilla::LazyLogModule ModuleLoaderBase::gModuleLoaderBaseLog(
"ModuleLoaderBase");
#undef LOG
#define LOG(args) \
MOZ_LOG(ModuleLoaderBase::gModuleLoaderBaseLog, mozilla::LogLevel::Debug, \
args)
#define LOG_ENABLED() \
MOZ_LOG_TEST(ModuleLoaderBase::gModuleLoaderBaseLog, mozilla::LogLevel::Debug)
// ModuleLoaderBase
//////////////////////////////////////////////////////////////
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ModuleLoaderBase)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTION(ModuleLoaderBase, mFetchedModules,
mDynamicImportRequests, mGlobalObject, mEventTarget,
mLoader)
NS_IMPL_CYCLE_COLLECTING_ADDREF(ModuleLoaderBase)
NS_IMPL_CYCLE_COLLECTING_RELEASE(ModuleLoaderBase)
// static
void ModuleLoaderBase::EnsureModuleHooksInitialized() {
AutoJSAPI jsapi;
jsapi.Init();
JSRuntime* rt = JS_GetRuntime(jsapi.cx());
if (JS::GetModuleResolveHook(rt)) {
return;
}
JS::SetModuleResolveHook(rt, HostResolveImportedModule);
JS::SetModuleMetadataHook(rt, HostPopulateImportMeta);
JS::SetScriptPrivateReferenceHooks(rt, HostAddRefTopLevelScript,
HostReleaseTopLevelScript);
JS::SetSupportedAssertionsHook(rt, HostGetSupportedImportAssertions);
JS::SetModuleDynamicImportHook(rt, HostImportModuleDynamically);
}
// 8.1.3.8.1 HostResolveImportedModule(referencingModule, moduleRequest)
/**
* Implement the HostResolveImportedModule abstract operation.
*
* Resolve a module specifier string and look this up in the module
* map, returning the result. This is only called for previously
* loaded modules and always succeeds.
*
* @param aReferencingPrivate A JS::Value which is either undefined
* or contains a LoadedScript private pointer.
* @param aModuleRequest A module request object.
* @returns module This is set to the module found.
*/
// static
JSObject* ModuleLoaderBase::HostResolveImportedModule(
JSContext* aCx, JS::Handle<JS::Value> aReferencingPrivate,
JS::Handle<JSObject*> aModuleRequest) {
JS::Rooted<JSObject*> module(aCx);
{
// LoadedScript should only live in this block, otherwise it will be a GC
// hazard
RefPtr<LoadedScript> script(
GetLoadedScriptOrNull(aCx, aReferencingPrivate));
JS::Rooted<JSString*> specifierString(
aCx, JS::GetModuleRequestSpecifier(aCx, aModuleRequest));
if (!specifierString) {
return nullptr;
}
// Let url be the result of resolving a module specifier given referencing
// module script and specifier.
nsAutoJSString string;
if (!string.init(aCx, specifierString)) {
return nullptr;
}
RefPtr<ModuleLoaderBase> loader = GetCurrentModuleLoader(aCx);
if (!loader) {
return nullptr;
}
auto result = loader->ResolveModuleSpecifier(script, string);
// This cannot fail because resolving a module specifier must have been
// previously successful with these same two arguments.
MOZ_ASSERT(result.isOk());
nsCOMPtr<nsIURI> uri = result.unwrap();
MOZ_ASSERT(uri, "Failed to resolve previously-resolved module specifier");
// Let resolved module script be moduleMap[url]. (This entry must exist for
// us to have gotten to this point.)
ModuleScript* ms = loader->GetFetchedModule(uri);
MOZ_ASSERT(ms, "Resolved module not found in module map");
MOZ_ASSERT(!ms->HasParseError());
MOZ_ASSERT(ms->ModuleRecord());
module.set(ms->ModuleRecord());
}
return module;
}
// static
bool ModuleLoaderBase::ImportMetaResolve(JSContext* cx, unsigned argc,
Value* vp) {
CallArgs args = CallArgsFromVp(argc, vp);
RootedValue modulePrivate(
cx, js::GetFunctionNativeReserved(&args.callee(), ModulePrivateSlot));
// https://html.spec.whatwg.org/#hostgetimportmetaproperties
// Step 4.1. Set specifier to ? ToString(specifier).
//
// https://tc39.es/ecma262/#sec-tostring
RootedValue v(cx, args.get(ImportMetaResolveSpecifierArg));
RootedString specifier(cx, JS::ToString(cx, v));
if (!specifier) {
return false;
}
// Step 4.2, 4.3 are implemented in ImportMetaResolveImpl.
RootedString url(cx, ImportMetaResolveImpl(cx, modulePrivate, specifier));
if (!url) {
return false;
}
// Step 4.4. Return the serialization of url.
args.rval().setString(url);
return true;
}
// static
JSString* ModuleLoaderBase::ImportMetaResolveImpl(
JSContext* aCx, JS::Handle<JS::Value> aReferencingPrivate,
JS::Handle<JSString*> aSpecifier) {
RootedString urlString(aCx);
{
// ModuleScript should only live in this block, otherwise it will be a GC
// hazard
RefPtr<ModuleScript> script =
static_cast<ModuleScript*>(aReferencingPrivate.toPrivate());
MOZ_ASSERT(script->IsModuleScript());
MOZ_ASSERT(JS::GetModulePrivate(script->ModuleRecord()) ==
aReferencingPrivate);
RefPtr<ModuleLoaderBase> loader = GetCurrentModuleLoader(aCx);
if (!loader) {
return nullptr;
}
nsAutoJSString specifier;
if (!specifier.init(aCx, aSpecifier)) {
return nullptr;
}
auto result = loader->ResolveModuleSpecifier(script, specifier);
if (result.isErr()) {
JS::Rooted<JS::Value> error(aCx);
nsresult rv = HandleResolveFailure(aCx, script, specifier,
result.unwrapErr(), 0, 0, &error);
if (NS_FAILED(rv)) {
JS_ReportOutOfMemory(aCx);
return nullptr;
}
JS_SetPendingException(aCx, error);
return nullptr;
}
nsCOMPtr<nsIURI> uri = result.unwrap();
nsAutoCString url;
MOZ_ALWAYS_SUCCEEDS(uri->GetAsciiSpec(url));
urlString.set(JS_NewStringCopyZ(aCx, url.get()));
}
return urlString;
}
// static
bool ModuleLoaderBase::HostPopulateImportMeta(
JSContext* aCx, JS::Handle<JS::Value> aReferencingPrivate,
JS::Handle<JSObject*> aMetaObject) {
RefPtr<ModuleScript> script =
static_cast<ModuleScript*>(aReferencingPrivate.toPrivate());
MOZ_ASSERT(script->IsModuleScript());
MOZ_ASSERT(JS::GetModulePrivate(script->ModuleRecord()) ==
aReferencingPrivate);
nsAutoCString url;
MOZ_DIAGNOSTIC_ASSERT(script->BaseURL());
MOZ_ALWAYS_SUCCEEDS(script->BaseURL()->GetAsciiSpec(url));
JS::Rooted<JSString*> urlString(aCx, JS_NewStringCopyZ(aCx, url.get()));
if (!urlString) {
JS_ReportOutOfMemory(aCx);
return false;
}
// https://html.spec.whatwg.org/#import-meta-url
if (!JS_DefineProperty(aCx, aMetaObject, "url", urlString,
JSPROP_ENUMERATE)) {
return false;
}
// https://html.spec.whatwg.org/#import-meta-resolve
// Define 'resolve' function on the import.meta object.
JSFunction* resolveFunc = js::DefineFunctionWithReserved(
aCx, aMetaObject, "resolve", ImportMetaResolve, ImportMetaResolveNumArgs,
JSPROP_ENUMERATE);
if (!resolveFunc) {
return false;
}
// Store the 'active script' of the meta object into the function slot.
// https://html.spec.whatwg.org/#active-script
RootedObject resolveFuncObj(aCx, JS_GetFunctionObject(resolveFunc));
js::SetFunctionNativeReserved(resolveFuncObj, ModulePrivateSlot,
aReferencingPrivate);
return true;
}
// static
bool ModuleLoaderBase::HostImportModuleDynamically(
JSContext* aCx, JS::Handle<JS::Value> aReferencingPrivate,
JS::Handle<JSObject*> aModuleRequest, JS::Handle<JSObject*> aPromise) {
RefPtr<LoadedScript> script(GetLoadedScriptOrNull(aCx, aReferencingPrivate));
JS::Rooted<JSString*> specifierString(
aCx, JS::GetModuleRequestSpecifier(aCx, aModuleRequest));
if (!specifierString) {
return false;
}
// Attempt to resolve the module specifier.
nsAutoJSString specifier;
if (!specifier.init(aCx, specifierString)) {
return false;
}
RefPtr<ModuleLoaderBase> loader = GetCurrentModuleLoader(aCx);
if (!loader) {
return false;
}
auto result = loader->ResolveModuleSpecifier(script, specifier);
if (result.isErr()) {
JS::Rooted<JS::Value> error(aCx);
nsresult rv = HandleResolveFailure(aCx, script, specifier,
result.unwrapErr(), 0, 0, &error);
if (NS_FAILED(rv)) {
JS_ReportOutOfMemory(aCx);
return false;
}
JS_SetPendingException(aCx, error);
return false;
}
// Create a new top-level load request.
nsCOMPtr<nsIURI> uri = result.unwrap();
RefPtr<ModuleLoadRequest> request = loader->CreateDynamicImport(
aCx, uri, script, aReferencingPrivate, specifierString, aPromise);
if (!request) {
JS_ReportErrorASCII(aCx, "Dynamic import not supported in this context");
return false;
}
loader->StartDynamicImport(request);
return true;
}
bool ModuleLoaderBase::HostGetSupportedImportAssertions(
JSContext* aCx, JS::ImportAssertionVector& aValues) {
MOZ_ASSERT(aValues.empty());
if (!aValues.reserve(1)) {
JS_ReportOutOfMemory(aCx);
return false;
}
aValues.infallibleAppend(JS::ImportAssertion::Type);
return true;
}
// static
ModuleLoaderBase* ModuleLoaderBase::GetCurrentModuleLoader(JSContext* aCx) {
auto reportError = mozilla::MakeScopeExit([aCx]() {
JS_ReportErrorASCII(aCx, "No ScriptLoader found for the current context");
});
JS::Rooted<JSObject*> object(aCx, JS::CurrentGlobalOrNull(aCx));
if (!object) {
return nullptr;
}
nsIGlobalObject* global = xpc::NativeGlobal(object);
if (!global) {
return nullptr;
}
ModuleLoaderBase* loader = global->GetModuleLoader(aCx);
if (!loader) {
return nullptr;
}
MOZ_ASSERT(loader->mGlobalObject == global);
reportError.release();
return loader;
}
// static
LoadedScript* ModuleLoaderBase::GetLoadedScriptOrNull(
JSContext* aCx, JS::Handle<JS::Value> aReferencingPrivate) {
if (aReferencingPrivate.isUndefined()) {
return nullptr;
}
auto* script = static_cast<LoadedScript*>(aReferencingPrivate.toPrivate());
if (script->IsEventScript()) {
return nullptr;
}
MOZ_ASSERT_IF(
script->IsModuleScript(),
JS::GetModulePrivate(script->AsModuleScript()->ModuleRecord()) ==
aReferencingPrivate);
return script;
}
nsresult ModuleLoaderBase::StartModuleLoad(ModuleLoadRequest* aRequest) {
return StartOrRestartModuleLoad(aRequest, RestartRequest::No);
}
nsresult ModuleLoaderBase::RestartModuleLoad(ModuleLoadRequest* aRequest) {
return StartOrRestartModuleLoad(aRequest, RestartRequest::Yes);
}
nsresult ModuleLoaderBase::StartOrRestartModuleLoad(ModuleLoadRequest* aRequest,
RestartRequest aRestart) {
MOZ_ASSERT(aRequest->mLoader == this);
MOZ_ASSERT(aRequest->IsFetching());
aRequest->SetUnknownDataType();
// If we're restarting the request, the module should already be in the
// "fetching" map.
MOZ_ASSERT_IF(aRestart == RestartRequest::Yes,
IsModuleFetching(aRequest->mURI));
// Check with the derived class whether we should load this module.
nsresult rv = NS_OK;
if (!CanStartLoad(aRequest, &rv)) {
return rv;
}
// Check whether the module has been fetched or is currently being fetched,
// and if so wait for it rather than starting a new fetch.
ModuleLoadRequest* request = aRequest->AsModuleRequest();
if (aRestart == RestartRequest::No && ModuleMapContainsURL(request->mURI)) {
LOG(("ScriptLoadRequest (%p): Waiting for module fetch", aRequest));
WaitForModuleFetch(request->mURI)
->Then(mEventTarget, __func__, request,
&ModuleLoadRequest::ModuleLoaded,
&ModuleLoadRequest::LoadFailed);
return NS_OK;
}
rv = StartFetch(aRequest);
NS_ENSURE_SUCCESS(rv, rv);
// We successfully started fetching a module so put its URL in the module
// map and mark it as fetching.
if (aRestart == RestartRequest::No) {
SetModuleFetchStarted(aRequest->AsModuleRequest());
}
return NS_OK;
}
bool ModuleLoaderBase::ModuleMapContainsURL(nsIURI* aURL) const {
return IsModuleFetching(aURL) || IsModuleFetched(aURL);
}
bool ModuleLoaderBase::IsModuleFetching(nsIURI* aURL) const {
return mFetchingModules.Contains(aURL);
}
bool ModuleLoaderBase::IsModuleFetched(nsIURI* aURL) const {
return mFetchedModules.Contains(aURL);
}
nsresult ModuleLoaderBase::GetFetchedModuleURLs(nsTArray<nsCString>& aURLs) {
for (const auto& entry : mFetchedModules) {
nsIURI* uri = entry.GetData()->BaseURL();
nsAutoCString spec;
nsresult rv = uri->GetSpec(spec);
NS_ENSURE_SUCCESS(rv, rv);
aURLs.AppendElement(spec);
}
return NS_OK;
}
void ModuleLoaderBase::SetModuleFetchStarted(ModuleLoadRequest* aRequest) {
// Update the module map to indicate that a module is currently being fetched.
MOZ_ASSERT(aRequest->IsFetching());
MOZ_ASSERT(!ModuleMapContainsURL(aRequest->mURI));
mFetchingModules.InsertOrUpdate(
aRequest->mURI, RefPtr<mozilla::GenericNonExclusivePromise::Private>{});
}
void ModuleLoaderBase::SetModuleFetchFinishedAndResumeWaitingRequests(
ModuleLoadRequest* aRequest, nsresult aResult) {
// Update module map with the result of fetching a single module script.
//
// If any requests for the same URL are waiting on this one to complete, they
// will have ModuleLoaded or LoadFailed on them when the promise is
// resolved/rejected. This is set up in StartLoad.
MOZ_ASSERT(aRequest->mLoader == this);
LOG(
("ScriptLoadRequest (%p): Module fetch finished (script == %p, result == "
"%u)",
aRequest, aRequest->mModuleScript.get(), unsigned(aResult)));
RefPtr<mozilla::GenericNonExclusivePromise::Private> promise;
if (!mFetchingModules.Remove(aRequest->mURI, getter_AddRefs(promise))) {
LOG(
("ScriptLoadRequest (%p): Key not found in mFetchingModules, "
"assuming we have an inline module or have finished fetching already",
aRequest));
return;
}
RefPtr<ModuleScript> moduleScript(aRequest->mModuleScript);
MOZ_ASSERT(NS_FAILED(aResult) == !moduleScript);
mFetchedModules.InsertOrUpdate(aRequest->mURI, RefPtr{moduleScript});
if (promise) {
if (moduleScript) {
LOG(("ScriptLoadRequest (%p): resolving %p", aRequest, promise.get()));
promise->Resolve(true, __func__);
} else {
LOG(("ScriptLoadRequest (%p): rejecting %p", aRequest, promise.get()));
promise->Reject(aResult, __func__);
}
}
}
RefPtr<mozilla::GenericNonExclusivePromise>
ModuleLoaderBase::WaitForModuleFetch(nsIURI* aURL) {
MOZ_ASSERT(ModuleMapContainsURL(aURL));
nsURIHashKey key(aURL);
if (auto entry = mFetchingModules.Lookup(aURL)) {
if (!entry.Data()) {
entry.Data() = new mozilla::GenericNonExclusivePromise::Private(__func__);
}
return entry.Data();
}
RefPtr<ModuleScript> ms;
MOZ_ALWAYS_TRUE(mFetchedModules.Get(aURL, getter_AddRefs(ms)));
if (!ms) {
return mozilla::GenericNonExclusivePromise::CreateAndReject(
NS_ERROR_FAILURE, __func__);
}
return mozilla::GenericNonExclusivePromise::CreateAndResolve(true, __func__);
}
ModuleScript* ModuleLoaderBase::GetFetchedModule(nsIURI* aURL) const {
if (LOG_ENABLED()) {
nsAutoCString url;
aURL->GetAsciiSpec(url);
LOG(("GetFetchedModule %s", url.get()));
}
bool found;
ModuleScript* ms = mFetchedModules.GetWeak(aURL, &found);
MOZ_ASSERT(found);
return ms;
}
nsresult ModuleLoaderBase::OnFetchComplete(ModuleLoadRequest* aRequest,
nsresult aRv) {
MOZ_ASSERT(aRequest->mLoader == this);
MOZ_ASSERT(!aRequest->mModuleScript);
nsresult rv = aRv;
if (NS_SUCCEEDED(rv)) {
rv = CreateModuleScript(aRequest);
// If a module script was created, it should either have a module record
// object or a parse error.
if (ModuleScript* ms = aRequest->mModuleScript) {
MOZ_DIAGNOSTIC_ASSERT(bool(ms->ModuleRecord()) != ms->HasParseError());
}
aRequest->ClearScriptSource();
if (NS_FAILED(rv)) {
aRequest->LoadFailed();
return rv;
}
}
MOZ_ASSERT(NS_SUCCEEDED(rv) == bool(aRequest->mModuleScript));
SetModuleFetchFinishedAndResumeWaitingRequests(aRequest, rv);
if (aRequest->mModuleScript && !aRequest->mModuleScript->HasParseError()) {
StartFetchingModuleDependencies(aRequest);
}
return NS_OK;
}
nsresult ModuleLoaderBase::CreateModuleScript(ModuleLoadRequest* aRequest) {
MOZ_ASSERT(!aRequest->mModuleScript);
MOZ_ASSERT(aRequest->mBaseURL);
LOG(("ScriptLoadRequest (%p): Create module script", aRequest));
AutoJSAPI jsapi;
if (!jsapi.Init(mGlobalObject)) {
return NS_ERROR_FAILURE;
}
nsresult rv;
{
JSContext* cx = jsapi.cx();
JS::Rooted<JSObject*> module(cx);
JS::CompileOptions options(cx);
JS::RootedScript introductionScript(cx);
rv = mLoader->FillCompileOptionsForRequest(cx, aRequest, &options,
&introductionScript);
if (NS_SUCCEEDED(rv)) {
JS::Rooted<JSObject*> global(cx, mGlobalObject->GetGlobalJSObject());
rv = CompileFetchedModule(cx, global, options, aRequest, &module);
}
MOZ_DIAGNOSTIC_ASSERT(NS_SUCCEEDED(rv) == (module != nullptr));
if (module) {
JS::RootedValue privateValue(cx);
JS::RootedScript moduleScript(cx, JS::GetModuleScript(module));
JS::InstantiateOptions instantiateOptions(options);
if (!JS::UpdateDebugMetadata(cx, moduleScript, instantiateOptions,
privateValue, nullptr, introductionScript,
nullptr)) {
return NS_ERROR_OUT_OF_MEMORY;
}
}
RefPtr<ModuleScript> moduleScript =
new ModuleScript(aRequest->mFetchOptions, aRequest->mBaseURL);
aRequest->mModuleScript = moduleScript;
if (!module) {
LOG(("ScriptLoadRequest (%p): compilation failed (%d)", aRequest,
unsigned(rv)));
JS::Rooted<JS::Value> error(cx);
if (!jsapi.HasException() || !jsapi.StealException(&error) ||
error.isUndefined()) {
aRequest->mModuleScript = nullptr;
return NS_ERROR_FAILURE;
}
moduleScript->SetParseError(error);
aRequest->ModuleErrored();
return NS_OK;
}
moduleScript->SetModuleRecord(module);
// Validate requested modules and treat failure to resolve module specifiers
// the same as a parse error.
rv = ResolveRequestedModules(aRequest, nullptr);
if (NS_FAILED(rv)) {
aRequest->ModuleErrored();
return NS_OK;
}
}
LOG(("ScriptLoadRequest (%p): module script == %p", aRequest,
aRequest->mModuleScript.get()));
return rv;
}
nsresult ModuleLoaderBase::HandleResolveFailure(
JSContext* aCx, LoadedScript* aScript, const nsAString& aSpecifier,
ResolveError aError, uint32_t aLineNumber, uint32_t aColumnNumber,
JS::MutableHandle<JS::Value> aErrorOut) {
JS::Rooted<JSString*> filename(aCx);
if (aScript) {
nsAutoCString url;
aScript->BaseURL()->GetAsciiSpec(url);
filename = JS_NewStringCopyZ(aCx, url.get());
} else {
filename = JS_NewStringCopyZ(aCx, "(unknown)");
}
if (!filename) {
return NS_ERROR_OUT_OF_MEMORY;
}
AutoTArray<nsString, 1> errorParams;
errorParams.AppendElement(aSpecifier);
nsAutoString errorText;
nsresult rv = nsContentUtils::FormatLocalizedString(
nsContentUtils::eDOM_PROPERTIES, ResolveErrorInfo::GetString(aError),
errorParams, errorText);
NS_ENSURE_SUCCESS(rv, rv);
JS::Rooted<JSString*> string(aCx, JS_NewUCStringCopyZ(aCx, errorText.get()));
if (!string) {
return NS_ERROR_OUT_OF_MEMORY;
}
if (!JS::CreateError(aCx, JSEXN_TYPEERR, nullptr, filename, aLineNumber,
aColumnNumber, nullptr, string, JS::NothingHandleValue,
aErrorOut)) {
return NS_ERROR_OUT_OF_MEMORY;
}
return NS_OK;
}
// Helper for getting import maps pref across main thread and workers
bool ImportMapsEnabled() {
if (NS_IsMainThread()) {
return mozilla::StaticPrefs::dom_importMaps_enabled();
}
return false;
}
ResolveResult ModuleLoaderBase::ResolveModuleSpecifier(
LoadedScript* aScript, const nsAString& aSpecifier) {
// If import map is enabled, forward to the updated 'Resolve a module
// specifier' algorithm defined in Import maps spec.
//
// Once import map is enabled by default,
// ModuleLoaderBase::ResolveModuleSpecifier should be replaced by
// ImportMap::ResolveModuleSpecifier.
if (ImportMapsEnabled()) {
return ImportMap::ResolveModuleSpecifier(mImportMap.get(), mLoader, aScript,
aSpecifier);
}
// The following module specifiers are allowed by the spec:
// - a valid absolute URL
// - a valid relative URL that starts with "/", "./" or "../"
//
// Bareword module specifiers are handled in Import maps.
nsCOMPtr<nsIURI> uri;
nsresult rv = NS_NewURI(getter_AddRefs(uri), aSpecifier);
if (NS_SUCCEEDED(rv)) {
return WrapNotNull(uri);
}
if (rv != NS_ERROR_MALFORMED_URI) {
return Err(ResolveError::Failure);
}
if (!StringBeginsWith(aSpecifier, u"/"_ns) &&
!StringBeginsWith(aSpecifier, u"./"_ns) &&
!StringBeginsWith(aSpecifier, u"../"_ns)) {
return Err(ResolveError::FailureMayBeBare);
}
// Get the document's base URL if we don't have a referencing script here.
nsCOMPtr<nsIURI> baseURL;
if (aScript) {
baseURL = aScript->BaseURL();
} else {
baseURL = mLoader->GetBaseURI();
}
rv = NS_NewURI(getter_AddRefs(uri), aSpecifier, nullptr, baseURL);
if (NS_SUCCEEDED(rv)) {
return WrapNotNull(uri);
}
return Err(ResolveError::Failure);
}
nsresult ModuleLoaderBase::ResolveRequestedModules(
ModuleLoadRequest* aRequest, nsCOMArray<nsIURI>* aUrlsOut) {
ModuleScript* ms = aRequest->mModuleScript;
AutoJSAPI jsapi;
if (!jsapi.Init(ms->ModuleRecord())) {
return NS_ERROR_FAILURE;
}
JSContext* cx = jsapi.cx();
JS::Rooted<JSObject*> moduleRecord(cx, ms->ModuleRecord());
JS::Rooted<JSObject*> requestedModules(cx);
requestedModules = JS::GetRequestedModules(cx, moduleRecord);
MOZ_ASSERT(requestedModules);
uint32_t length;
if (!JS::GetArrayLength(cx, requestedModules, &length)) {
return NS_ERROR_FAILURE;
}
JS::Rooted<JS::Value> requestedModule(cx);
for (uint32_t i = 0; i < length; i++) {
if (!JS_GetElement(cx, requestedModules, i, &requestedModule)) {
return NS_ERROR_FAILURE;
}
JS::Rooted<JSString*> str(
cx, JS::GetRequestedModuleSpecifier(cx, requestedModule));
MOZ_ASSERT(str);
nsAutoJSString specifier;
if (!specifier.init(cx, str)) {
return NS_ERROR_FAILURE;
}
// Let url be the result of resolving a module specifier given module script
// and requested.
ModuleLoaderBase* loader = aRequest->mLoader;
auto result = loader->ResolveModuleSpecifier(ms, specifier);
if (result.isErr()) {
uint32_t lineNumber = 0;
uint32_t columnNumber = 0;
JS::GetRequestedModuleSourcePos(cx, requestedModule, &lineNumber,
&columnNumber);
JS::Rooted<JS::Value> error(cx);
nsresult rv = HandleResolveFailure(cx, ms, specifier, result.unwrapErr(),
lineNumber, columnNumber, &error);
NS_ENSURE_SUCCESS(rv, rv);
ms->SetParseError(error);
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsIURI> uri = result.unwrap();
if (aUrlsOut) {
aUrlsOut->AppendElement(uri.forget());
}
}
return NS_OK;
}
void ModuleLoaderBase::StartFetchingModuleDependencies(
ModuleLoadRequest* aRequest) {
LOG(("ScriptLoadRequest (%p): Start fetching module dependencies", aRequest));
if (aRequest->IsCanceled()) {
return;
}
MOZ_ASSERT(aRequest->mModuleScript);
MOZ_ASSERT(!aRequest->mModuleScript->HasParseError());
MOZ_ASSERT(!aRequest->IsReadyToRun());
auto visitedSet = aRequest->mVisitedSet;
MOZ_ASSERT(visitedSet->Contains(aRequest->mURI));
aRequest->mState = ModuleLoadRequest::State::LoadingImports;
nsCOMArray<nsIURI> urls;
nsresult rv = ResolveRequestedModules(aRequest, &urls);
if (NS_FAILED(rv)) {
aRequest->mModuleScript = nullptr;
aRequest->ModuleErrored();
return;
}
// Remove already visited URLs from the list. Put unvisited URLs into the
// visited set.
int32_t i = 0;
while (i < urls.Count()) {
nsIURI* url = urls[i];
if (visitedSet->Contains(url)) {
urls.RemoveObjectAt(i);
} else {
visitedSet->PutEntry(url);
i++;
}
}
if (urls.Count() == 0) {
// There are no descendants to load so this request is ready.
aRequest->DependenciesLoaded();
return;
}
// For each url in urls, fetch a module script graph given url, module
// script's CORS setting, and module script's settings object.
nsTArray<RefPtr<mozilla::GenericPromise>> importsReady;
for (auto* url : urls) {
RefPtr<mozilla::GenericPromise> childReady =
StartFetchingModuleAndDependencies(aRequest, url);
importsReady.AppendElement(childReady);
}
// Wait for all imports to become ready.
RefPtr<mozilla::GenericPromise::AllPromiseType> allReady =
mozilla::GenericPromise::All(mEventTarget, importsReady);
allReady->Then(mEventTarget, __func__, aRequest,
&ModuleLoadRequest::DependenciesLoaded,
&ModuleLoadRequest::ModuleErrored);
}
RefPtr<mozilla::GenericPromise>
ModuleLoaderBase::StartFetchingModuleAndDependencies(ModuleLoadRequest* aParent,
nsIURI* aURI) {
MOZ_ASSERT(aURI);
RefPtr<ModuleLoadRequest> childRequest = CreateStaticImport(aURI, aParent);
aParent->mImports.AppendElement(childRequest);
if (LOG_ENABLED()) {
nsAutoCString url1;
aParent->mURI->GetAsciiSpec(url1);
nsAutoCString url2;
aURI->GetAsciiSpec(url2);
LOG(("ScriptLoadRequest (%p): Start fetching dependency %p", aParent,
childRequest.get()));
LOG(("StartFetchingModuleAndDependencies \"%s\" -> \"%s\"", url1.get(),
url2.get()));
}
RefPtr<mozilla::GenericPromise> ready = childRequest->mReady.Ensure(__func__);
nsresult rv = StartModuleLoad(childRequest);
if (NS_FAILED(rv)) {
MOZ_ASSERT(!childRequest->mModuleScript);
LOG(("ScriptLoadRequest (%p): rejecting %p", aParent,
&childRequest->mReady));
mLoader->ReportErrorToConsole(childRequest, rv);
childRequest->mReady.Reject(rv, __func__);
return ready;
}
return ready;
}
void ModuleLoaderBase::StartDynamicImport(ModuleLoadRequest* aRequest) {
MOZ_ASSERT(aRequest->mLoader == this);
LOG(("ScriptLoadRequest (%p): Start dynamic import", aRequest));
mDynamicImportRequests.AppendElement(aRequest);
nsresult rv = StartModuleLoad(aRequest);
if (NS_FAILED(rv)) {
mLoader->ReportErrorToConsole(aRequest, rv);
FinishDynamicImportAndReject(aRequest, rv);
}
}
void ModuleLoaderBase::FinishDynamicImportAndReject(ModuleLoadRequest* aRequest,
nsresult aResult) {
AutoJSAPI jsapi;
MOZ_ASSERT(NS_FAILED(aResult));
MOZ_ALWAYS_TRUE(jsapi.Init(aRequest->mDynamicPromise));
FinishDynamicImport(jsapi.cx(), aRequest, aResult, nullptr);
}
void ModuleLoaderBase::FinishDynamicImport(
JSContext* aCx, ModuleLoadRequest* aRequest, nsresult aResult,
JS::Handle<JSObject*> aEvaluationPromise) {
// If aResult is a failed result, we don't have an EvaluationPromise. If it
// succeeded, evaluationPromise may still be null, but in this case it will
// be handled by rejecting the dynamic module import promise in the JSAPI.
MOZ_ASSERT_IF(NS_FAILED(aResult), !aEvaluationPromise);
LOG(("ScriptLoadRequest (%p): Finish dynamic import %x %d", aRequest,
unsigned(aResult), JS_IsExceptionPending(aCx)));
// Complete the dynamic import, report failures indicated by aResult or as a
// pending exception on the context.
if (NS_FAILED(aResult) &&
aResult != NS_SUCCESS_DOM_SCRIPT_EVALUATION_THREW_UNCATCHABLE) {
MOZ_ASSERT(!JS_IsExceptionPending(aCx));
JS_ReportErrorNumberUC(aCx, js::GetErrorMessage, nullptr,
JSMSG_DYNAMIC_IMPORT_FAILED);
}
JS::Rooted<JS::Value> referencingScript(aCx,
aRequest->mDynamicReferencingPrivate);
JS::Rooted<JSString*> specifier(aCx, aRequest->mDynamicSpecifier);
JS::Rooted<JSObject*> promise(aCx, aRequest->mDynamicPromise);
JS::Rooted<JSObject*> moduleRequest(aCx,
JS::CreateModuleRequest(aCx, specifier));
JS::FinishDynamicModuleImport(aCx, aEvaluationPromise, referencingScript,
moduleRequest, promise);
// FinishDynamicModuleImport clears any pending exception.
MOZ_ASSERT(!JS_IsExceptionPending(aCx));
aRequest->ClearDynamicImport();
}
ModuleLoaderBase::ModuleLoaderBase(ScriptLoaderInterface* aLoader,
nsIGlobalObject* aGlobalObject,
nsISerialEventTarget* aEventTarget)
: mGlobalObject(aGlobalObject),
mEventTarget(aEventTarget),
mLoader(aLoader) {
MOZ_ASSERT(mGlobalObject);
MOZ_ASSERT(mEventTarget);
MOZ_ASSERT(mLoader);
EnsureModuleHooksInitialized();
}
ModuleLoaderBase::~ModuleLoaderBase() {
mDynamicImportRequests.CancelRequestsAndClear();
LOG(("ModuleLoaderBase::~ModuleLoaderBase %p", this));
}
void ModuleLoaderBase::Shutdown() {
MOZ_ASSERT(mFetchingModules.IsEmpty());
for (const auto& entry : mFetchedModules) {
entry.GetData()->Shutdown();
}
mFetchedModules.Clear();
mGlobalObject = nullptr;
mEventTarget = nullptr;
mLoader = nullptr;
}