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-rw-r--r--js/loader/LoadedScript.cpp289
1 files changed, 289 insertions, 0 deletions
diff --git a/js/loader/LoadedScript.cpp b/js/loader/LoadedScript.cpp
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index 0000000000..7ddd04168e
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+++ b/js/loader/LoadedScript.cpp
@@ -0,0 +1,289 @@
+/* -*- 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 "LoadedScript.h"
+
+#include "mozilla/HoldDropJSObjects.h"
+#include "mozilla/UniquePtr.h" // mozilla::UniquePtr
+
+#include "mozilla/dom/ScriptLoadContext.h" // ScriptLoadContext
+#include "jsfriendapi.h"
+#include "js/Modules.h" // JS::{Get,Set}ModulePrivate
+#include "LoadContextBase.h" // LoadContextBase
+
+namespace JS::loader {
+
+//////////////////////////////////////////////////////////////
+// LoadedScript
+//////////////////////////////////////////////////////////////
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(LoadedScript)
+ NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(LoadedScript)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(LoadedScript)
+ NS_IMPL_CYCLE_COLLECTION_UNLINK(mFetchOptions)
+ NS_IMPL_CYCLE_COLLECTION_UNLINK(mBaseURL)
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(LoadedScript)
+ NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mFetchOptions)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(LoadedScript)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(LoadedScript)
+
+LoadedScript::LoadedScript(ScriptKind aKind,
+ mozilla::dom::ReferrerPolicy aReferrerPolicy,
+ ScriptFetchOptions* aFetchOptions, nsIURI* aURI)
+ : mKind(aKind),
+ mReferrerPolicy(aReferrerPolicy),
+ mFetchOptions(aFetchOptions),
+ mURI(aURI),
+ mDataType(DataType::eUnknown),
+ mReceivedScriptTextLength(0),
+ mBytecodeOffset(0) {
+ MOZ_ASSERT(mFetchOptions);
+ MOZ_ASSERT(mURI);
+}
+
+LoadedScript::~LoadedScript() { mozilla::DropJSObjects(this); }
+
+void LoadedScript::AssociateWithScript(JSScript* aScript) {
+ // Verify that the rewritten URL is available when manipulating LoadedScript.
+ MOZ_ASSERT(mBaseURL);
+
+ // Set a JSScript's private value to point to this object. The JS engine will
+ // increment our reference count by calling HostAddRefTopLevelScript(). This
+ // is decremented by HostReleaseTopLevelScript() below when the JSScript dies.
+
+ MOZ_ASSERT(JS::GetScriptPrivate(aScript).isUndefined());
+ JS::SetScriptPrivate(aScript, JS::PrivateValue(this));
+}
+
+nsresult LoadedScript::GetScriptSource(JSContext* aCx,
+ MaybeSourceText* aMaybeSource,
+ LoadContextBase* aMaybeLoadContext) {
+ // If there's no script text, we try to get it from the element
+ bool isWindowContext =
+ aMaybeLoadContext && aMaybeLoadContext->IsWindowContext();
+ if (isWindowContext && aMaybeLoadContext->AsWindowContext()->mIsInline) {
+ nsAutoString inlineData;
+ auto* scriptLoadContext = aMaybeLoadContext->AsWindowContext();
+ scriptLoadContext->GetScriptElement()->GetScriptText(inlineData);
+
+ size_t nbytes = inlineData.Length() * sizeof(char16_t);
+ JS::UniqueTwoByteChars chars(
+ static_cast<char16_t*>(JS_malloc(aCx, nbytes)));
+ if (!chars) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+
+ memcpy(chars.get(), inlineData.get(), nbytes);
+
+ SourceText<char16_t> srcBuf;
+ if (!srcBuf.init(aCx, std::move(chars), inlineData.Length())) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+
+ aMaybeSource->construct<SourceText<char16_t>>(std::move(srcBuf));
+ return NS_OK;
+ }
+
+ size_t length = ScriptTextLength();
+ if (IsUTF16Text()) {
+ JS::UniqueTwoByteChars chars;
+ chars.reset(ScriptText<char16_t>().extractOrCopyRawBuffer());
+ if (!chars) {
+ JS_ReportOutOfMemory(aCx);
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+
+ SourceText<char16_t> srcBuf;
+ if (!srcBuf.init(aCx, std::move(chars), length)) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+
+ aMaybeSource->construct<SourceText<char16_t>>(std::move(srcBuf));
+ return NS_OK;
+ }
+
+ MOZ_ASSERT(IsUTF8Text());
+ mozilla::UniquePtr<Utf8Unit[], JS::FreePolicy> chars;
+ chars.reset(ScriptText<Utf8Unit>().extractOrCopyRawBuffer());
+ if (!chars) {
+ JS_ReportOutOfMemory(aCx);
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+
+ SourceText<Utf8Unit> srcBuf;
+ if (!srcBuf.init(aCx, std::move(chars), length)) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+
+ aMaybeSource->construct<SourceText<Utf8Unit>>(std::move(srcBuf));
+ return NS_OK;
+}
+
+inline void CheckModuleScriptPrivate(LoadedScript* script,
+ const JS::Value& aPrivate) {
+#ifdef DEBUG
+ if (script->IsModuleScript()) {
+ JSObject* module = script->AsModuleScript()->mModuleRecord.unbarrieredGet();
+ MOZ_ASSERT_IF(module, JS::GetModulePrivate(module) == aPrivate);
+ }
+#endif
+}
+
+void HostAddRefTopLevelScript(const JS::Value& aPrivate) {
+ // Increment the reference count of a LoadedScript object that is now pointed
+ // to by a JSScript. The reference count is decremented by
+ // HostReleaseTopLevelScript() below.
+
+ auto script = static_cast<LoadedScript*>(aPrivate.toPrivate());
+ CheckModuleScriptPrivate(script, aPrivate);
+ script->AddRef();
+}
+
+void HostReleaseTopLevelScript(const JS::Value& aPrivate) {
+ // Decrement the reference count of a LoadedScript object that was pointed to
+ // by a JSScript. The reference count was originally incremented by
+ // HostAddRefTopLevelScript() above.
+
+ auto script = static_cast<LoadedScript*>(aPrivate.toPrivate());
+ CheckModuleScriptPrivate(script, aPrivate);
+ script->Release();
+}
+
+//////////////////////////////////////////////////////////////
+// EventScript
+//////////////////////////////////////////////////////////////
+
+EventScript::EventScript(mozilla::dom::ReferrerPolicy aReferrerPolicy,
+ ScriptFetchOptions* aFetchOptions, nsIURI* aURI)
+ : LoadedScript(ScriptKind::eEvent, aReferrerPolicy, aFetchOptions, aURI) {
+ // EventScripts are not using ScriptLoadRequest, and mBaseURL and mURI are
+ // the same thing.
+ SetBaseURL(aURI);
+}
+
+//////////////////////////////////////////////////////////////
+// ClassicScript
+//////////////////////////////////////////////////////////////
+
+ClassicScript::ClassicScript(mozilla::dom::ReferrerPolicy aReferrerPolicy,
+ ScriptFetchOptions* aFetchOptions, nsIURI* aURI)
+ : LoadedScript(ScriptKind::eClassic, aReferrerPolicy, aFetchOptions, aURI) {
+}
+
+//////////////////////////////////////////////////////////////
+// ModuleScript
+//////////////////////////////////////////////////////////////
+
+NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED_0(ModuleScript, LoadedScript)
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(ModuleScript)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(ModuleScript, LoadedScript)
+ tmp->UnlinkModuleRecord();
+ tmp->mParseError.setUndefined();
+ tmp->mErrorToRethrow.setUndefined();
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(ModuleScript, LoadedScript)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(ModuleScript, LoadedScript)
+ NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mModuleRecord)
+ NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mParseError)
+ NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mErrorToRethrow)
+NS_IMPL_CYCLE_COLLECTION_TRACE_END
+
+ModuleScript::ModuleScript(mozilla::dom::ReferrerPolicy aReferrerPolicy,
+ ScriptFetchOptions* aFetchOptions, nsIURI* aURI)
+ : LoadedScript(ScriptKind::eModule, aReferrerPolicy, aFetchOptions, aURI),
+ mDebuggerDataInitialized(false) {
+ MOZ_ASSERT(!ModuleRecord());
+ MOZ_ASSERT(!HasParseError());
+ MOZ_ASSERT(!HasErrorToRethrow());
+}
+
+void ModuleScript::Shutdown() {
+ if (mModuleRecord) {
+ JS::ClearModuleEnvironment(mModuleRecord);
+ }
+
+ UnlinkModuleRecord();
+}
+
+void ModuleScript::UnlinkModuleRecord() {
+ // Remove the module record's pointer to this object if present and decrement
+ // our reference count. The reference is added by SetModuleRecord() below.
+ //
+ // This takes care not to trigger gray unmarking because this takes a lot of
+ // time when we're tearing down the entire page. This is safe because we are
+ // only writing undefined into the module private, so it won't create any
+ // black-gray edges.
+ if (mModuleRecord) {
+ JSObject* module = mModuleRecord.unbarrieredGet();
+ MOZ_ASSERT(JS::GetModulePrivate(module).toPrivate() == this);
+ JS::ClearModulePrivate(module);
+ mModuleRecord = nullptr;
+ }
+}
+
+ModuleScript::~ModuleScript() {
+ // The object may be destroyed without being unlinked first.
+ UnlinkModuleRecord();
+}
+
+void ModuleScript::SetModuleRecord(JS::Handle<JSObject*> aModuleRecord) {
+ MOZ_ASSERT(!mModuleRecord);
+ MOZ_ASSERT_IF(IsModuleScript(), !AsModuleScript()->HasParseError());
+ MOZ_ASSERT_IF(IsModuleScript(), !AsModuleScript()->HasErrorToRethrow());
+
+ mModuleRecord = aModuleRecord;
+
+ // Make module's host defined field point to this object. The JS engine will
+ // increment our reference count by calling HostAddRefTopLevelScript(). This
+ // is decremented when the field is cleared in UnlinkModuleRecord() above or
+ // when the module record dies.
+ MOZ_ASSERT(JS::GetModulePrivate(mModuleRecord).isUndefined());
+ JS::SetModulePrivate(mModuleRecord, JS::PrivateValue(this));
+
+ mozilla::HoldJSObjects(this);
+}
+
+void ModuleScript::SetParseError(const JS::Value& aError) {
+ MOZ_ASSERT(!aError.isUndefined());
+ MOZ_ASSERT(!HasParseError());
+ MOZ_ASSERT(!HasErrorToRethrow());
+
+ UnlinkModuleRecord();
+ mParseError = aError;
+ mozilla::HoldJSObjects(this);
+}
+
+void ModuleScript::SetErrorToRethrow(const JS::Value& aError) {
+ MOZ_ASSERT(!aError.isUndefined());
+
+ // This is only called after SetModuleRecord() or SetParseError() so we don't
+ // need to call HoldJSObjects() here.
+ MOZ_ASSERT(ModuleRecord() || HasParseError());
+
+ mErrorToRethrow = aError;
+}
+
+void ModuleScript::SetDebuggerDataInitialized() {
+ MOZ_ASSERT(ModuleRecord());
+ MOZ_ASSERT(!mDebuggerDataInitialized);
+
+ mDebuggerDataInitialized = true;
+}
+
+} // namespace JS::loader
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