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ModuleLoaderBase.cpp
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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/ColumnNumber.h" // JS::ColumnNumberOneOrigin
#include "js/ContextOptions.h" // JS::ContextOptionsRef
#include "js/ErrorReport.h" // JSErrorBase
#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/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::CycleCollectedJSContext;
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::WaitingRequests
//////////////////////////////////////////////////////////////
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ModuleLoaderBase::WaitingRequests)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTION(ModuleLoaderBase::WaitingRequests, mWaiting)
NS_IMPL_CYCLE_COLLECTING_ADDREF(ModuleLoaderBase::WaitingRequests)
NS_IMPL_CYCLE_COLLECTING_RELEASE(ModuleLoaderBase::WaitingRequests)
//////////////////////////////////////////////////////////////
// ModuleLoaderBase
//////////////////////////////////////////////////////////////
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ModuleLoaderBase)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTION(ModuleLoaderBase, mFetchingModules, 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::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 = loader->HandleResolveFailure(
aCx, script, specifier, result.unwrapErr(), 0,
JS::ColumnNumberOneOrigin(), &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) {
MOZ_DIAGNOSTIC_ASSERT(aModuleRequest);
MOZ_DIAGNOSTIC_ASSERT(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 =
loader->HandleResolveFailure(aCx, script, specifier, result.unwrapErr(),
0, JS::ColumnNumberOneOrigin(), &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, specifierString, aPromise);
if (!request) {
// Throws TypeError if CreateDynamicImport returns nullptr.
JS_ReportErrorNumberASCII(aCx, js::GetErrorMessage, nullptr,
JSMSG_DYNAMIC_IMPORT_NOT_SUPPORTED);
return false;
}
loader->StartDynamicImport(request);
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());
MOZ_ASSERT_IF(
script->IsModuleScript(),
JS::GetModulePrivate(script->AsModuleScript()->ModuleRecord()) ==
aReferencingPrivate);
return script;
}
JS::Value PrivateFromLoadedScript(LoadedScript* aScript) {
if (!aScript) {
return JS::UndefinedValue();
}
return JS::PrivateValue(aScript);
}
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->IsPendingFetchingError());
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);
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() || aRequest->IsPendingFetchingError());
MOZ_ASSERT(!ModuleMapContainsURL(aRequest->mURI));
mFetchingModules.InsertOrUpdate(aRequest->mURI, nullptr);
}
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, call
// ModuleLoaded or LoadFailed to resume or fail them as appropriate.
MOZ_ASSERT(aRequest->mLoader == this);
LOG(
("ScriptLoadRequest (%p): Module fetch finished (script == %p, result == "
"%u)",
aRequest, aRequest->mModuleScript.get(), unsigned(aResult)));
RefPtr<WaitingRequests> waitingRequests;
if (!mFetchingModules.Remove(aRequest->mURI,
getter_AddRefs(waitingRequests))) {
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 (waitingRequests) {
LOG(("ScriptLoadRequest (%p): Resuming waiting requests", aRequest));
ResumeWaitingRequests(waitingRequests, bool(moduleScript));
}
}
void ModuleLoaderBase::ResumeWaitingRequests(WaitingRequests* aWaitingRequests,
bool aSuccess) {
for (ModuleLoadRequest* request : aWaitingRequests->mWaiting) {
ResumeWaitingRequest(request, aSuccess);
}
}
void ModuleLoaderBase::ResumeWaitingRequest(ModuleLoadRequest* aRequest,
bool aSuccess) {
if (aSuccess) {
aRequest->ModuleLoaded();
} else {
aRequest->LoadFailed();
}
}
void ModuleLoaderBase::WaitForModuleFetch(ModuleLoadRequest* aRequest) {
nsIURI* uri = aRequest->mURI;
MOZ_ASSERT(ModuleMapContainsURL(uri));
if (auto entry = mFetchingModules.Lookup(uri)) {
RefPtr<WaitingRequests> waitingRequests = entry.Data();
if (!waitingRequests) {
waitingRequests = new WaitingRequests();
mFetchingModules.InsertOrUpdate(uri, waitingRequests);
}
waitingRequests->mWaiting.AppendElement(aRequest);
return;
}
RefPtr<ModuleScript> ms;
MOZ_ALWAYS_TRUE(mFetchedModules.Get(uri, getter_AddRefs(ms)));
ResumeWaitingRequest(aRequest, bool(ms));
}
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->IsErrored()) {
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;
}
}
MOZ_ASSERT(aRequest->mLoadedScript->IsModuleScript());
MOZ_ASSERT(aRequest->mLoadedScript->GetFetchOptions() ==
aRequest->mFetchOptions);
MOZ_ASSERT(aRequest->mLoadedScript->GetURI() == aRequest->mURI);
aRequest->mLoadedScript->SetBaseURL(aRequest->mBaseURL);
RefPtr<ModuleScript> moduleScript =
aRequest->mLoadedScript->AsModuleScript();
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)) {
if (!aRequest->IsErrored()) {
aRequest->mModuleScript = nullptr;
return rv;
}
aRequest->ModuleErrored();
return NS_OK;
}
}
LOG(("ScriptLoadRequest (%p): module script == %p", aRequest,
aRequest->mModuleScript.get()));
return rv;
}
nsresult ModuleLoaderBase::GetResolveFailureMessage(ResolveError aError,
const nsAString& aSpecifier,
nsAString& aResult) {
AutoTArray<nsString, 1> errorParams;
errorParams.AppendElement(aSpecifier);
nsresult rv = nsContentUtils::FormatLocalizedString(
nsContentUtils::eDOM_PROPERTIES, ResolveErrorInfo::GetString(aError),
errorParams, aResult);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
nsresult ModuleLoaderBase::HandleResolveFailure(
JSContext* aCx, LoadedScript* aScript, const nsAString& aSpecifier,
ResolveError aError, uint32_t aLineNumber,
JS::ColumnNumberOneOrigin 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;
}
nsAutoString errorText;
nsresult rv = GetResolveFailureMessage(aError, aSpecifier, 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;
}
ResolveResult ModuleLoaderBase::ResolveModuleSpecifier(
LoadedScript* aScript, const nsAString& aSpecifier) {
// Import Maps are not supported on workers/worklets.
// See https://github.com/WICG/import-maps/issues/2
MOZ_ASSERT_IF(!NS_IsMainThread(), mImportMap == nullptr);
// Forward to the updated 'Resolve a module specifier' algorithm defined in
// the Import Maps spec.
return ImportMap::ResolveModuleSpecifier(mImportMap.get(), mLoader, aScript,
aSpecifier);
}
nsresult ModuleLoaderBase::ResolveRequestedModules(
ModuleLoadRequest* aRequest, nsCOMArray<nsIURI>* aUrlsOut) {
ModuleScript* ms = aRequest->mModuleScript;
AutoJSAPI jsapi;
if (!jsapi.Init(mGlobalObject)) {
return NS_ERROR_FAILURE;
}
JSContext* cx = jsapi.cx();
JS::Rooted<JSObject*> moduleRecord(cx, ms->ModuleRecord());
uint32_t length = JS::GetRequestedModulesCount(cx, moduleRecord);
for (uint32_t i = 0; i < length; i++) {
JS::Rooted<JSString*> str(
cx, JS::GetRequestedModuleSpecifier(cx, moduleRecord, i));
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;
JS::ColumnNumberOneOrigin columnNumber;
JS::GetRequestedModuleSourcePos(cx, moduleRecord, i, &lineNumber,
&columnNumber);
JS::Rooted<JS::Value> error(cx);
nsresult rv =
loader->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->IsFetching() || aRequest->IsCompiling());
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;
}
MOZ_ASSERT(aRequest->mAwaitingImports == 0);
aRequest->mAwaitingImports = urls.Count();
// For each url in urls, fetch a module script graph given url, module
// script's CORS setting, and module script's settings object.
for (auto* url : urls) {
StartFetchingModuleAndDependencies(aRequest, url);
}
}
void 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()));
}
MOZ_ASSERT(!childRequest->mWaitingParentRequest);
childRequest->mWaitingParentRequest = aParent;
nsresult rv = StartModuleLoad(childRequest);
if (NS_FAILED(rv)) {
MOZ_ASSERT(!childRequest->mModuleScript);
LOG(("ScriptLoadRequest (%p): rejecting %p", aParent,
childRequest.get()));
mLoader->ReportErrorToConsole(childRequest, rv);
childRequest->LoadFailed();
}
}
void ModuleLoadRequest::ChildLoadComplete(bool aSuccess) {
RefPtr<ModuleLoadRequest> parent = mWaitingParentRequest;
MOZ_ASSERT(parent);
MOZ_ASSERT(parent->mAwaitingImports != 0);
mWaitingParentRequest = nullptr;
parent->mAwaitingImports--;
if (parent->IsFinished()) {
MOZ_ASSERT_IF(!aSuccess, parent->IsErrored());
return;
}
if (!aSuccess) {
parent->ModuleErrored();
} else if (parent->mAwaitingImports == 0) {
parent->DependenciesLoaded();
}
}
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));
if (!jsapi.Init(mGlobalObject)) {
return;
}
FinishDynamicImport(jsapi.cx(), aRequest, aResult, nullptr);
}
/* static */
void ModuleLoaderBase::FinishDynamicImport(
JSContext* aCx, ModuleLoadRequest* aRequest, nsresult aResult,
JS::Handle<JSObject*> aEvaluationPromise) {
LOG(("ScriptLoadRequest (%p): Finish dynamic import %x %d", aRequest,
unsigned(aResult), JS_IsExceptionPending(aCx)));
MOZ_ASSERT(GetCurrentModuleLoader(aCx) == aRequest->mLoader);
// 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);
// Complete the dynamic import, report failures indicated by aResult or as a
// pending exception on the context.
if (!aRequest->mDynamicPromise) {
// Import has already been completed.
return;
}
if (NS_FAILED(aResult) &&
aResult != NS_SUCCESS_DOM_SCRIPT_EVALUATION_THREW_UNCATCHABLE) {
MOZ_ASSERT(!JS_IsExceptionPending(aCx));
nsAutoCString url;
aRequest->mURI->GetSpec(url);
JS_ReportErrorNumberASCII(aCx, js::GetErrorMessage, nullptr,
JSMSG_DYNAMIC_IMPORT_FAILED, url.get());
}
JS::Rooted<JS::Value> referencingScript(
aCx, PrivateFromLoadedScript(aRequest->mDynamicReferencingScript));
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() {
CancelAndClearDynamicImports();
for (const auto& entry : mFetchingModules) {
RefPtr<WaitingRequests> waitingRequests(entry.GetData());
if (waitingRequests) {
ResumeWaitingRequests(waitingRequests, false);
}