mirror of
https://github.com/mozilla/gecko-dev.git
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305 lines
8.3 KiB
C++
305 lines
8.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* This is not a generated file. It contains common utility functions
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* invoked from the JavaScript code generated from IDL interfaces.
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* The goal of the utility functions is to cut down on the size of
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* the generated code itself.
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*/
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#include "mozilla/dom/JSExecutionContext.h"
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#include <utility>
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#include "ErrorList.h"
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#include "MainThreadUtils.h"
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#include "js/CompilationAndEvaluation.h"
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#include "js/CompileOptions.h"
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#include "js/Conversions.h"
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#include "js/experimental/JSStencil.h"
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#include "js/HeapAPI.h"
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#include "js/OffThreadScriptCompilation.h"
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#include "js/ProfilingCategory.h"
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#include "js/Promise.h"
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#include "js/SourceText.h"
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#include "js/Transcoding.h"
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#include "js/Value.h"
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#include "js/Wrapper.h"
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#include "jsapi.h"
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#include "mozilla/CycleCollectedJSContext.h"
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#include "mozilla/Likely.h"
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#include "nsContentUtils.h"
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#include "nsTPromiseFlatString.h"
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#include "xpcpublic.h"
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#if !defined(DEBUG) && !defined(MOZ_ENABLE_JS_DUMP)
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# include "mozilla/StaticPrefs_browser.h"
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#endif
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using namespace mozilla;
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using namespace mozilla::dom;
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static nsresult EvaluationExceptionToNSResult(JSContext* aCx) {
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if (JS_IsExceptionPending(aCx)) {
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return NS_SUCCESS_DOM_SCRIPT_EVALUATION_THREW;
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}
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return NS_SUCCESS_DOM_SCRIPT_EVALUATION_THREW_UNCATCHABLE;
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}
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JSExecutionContext::JSExecutionContext(
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JSContext* aCx, JS::Handle<JSObject*> aGlobal,
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JS::CompileOptions& aCompileOptions,
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JS::Handle<JS::Value> aDebuggerPrivateValue,
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JS::Handle<JSScript*> aDebuggerIntroductionScript)
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: mAutoProfilerLabel("JSExecutionContext",
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/* dynamicStr */ nullptr,
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JS::ProfilingCategoryPair::JS),
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mCx(aCx),
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mRealm(aCx, aGlobal),
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mRetValue(aCx),
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mScript(aCx),
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mCompileOptions(aCompileOptions),
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mDebuggerPrivateValue(aCx, aDebuggerPrivateValue),
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mDebuggerIntroductionScript(aCx, aDebuggerIntroductionScript),
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mRv(NS_OK),
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mSkip(false),
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mCoerceToString(false),
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mEncodeBytecode(false)
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#ifdef DEBUG
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,
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mWantsReturnValue(false),
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mScriptUsed(false)
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#endif
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{
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MOZ_ASSERT(aCx == nsContentUtils::GetCurrentJSContext());
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MOZ_ASSERT(NS_IsMainThread());
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MOZ_ASSERT(CycleCollectedJSContext::Get() &&
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CycleCollectedJSContext::Get()->MicroTaskLevel());
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MOZ_ASSERT(mRetValue.isUndefined());
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MOZ_ASSERT(JS_IsGlobalObject(aGlobal));
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if (MOZ_UNLIKELY(!xpc::Scriptability::Get(aGlobal).Allowed())) {
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mSkip = true;
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mRv = NS_OK;
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}
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}
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nsresult JSExecutionContext::JoinOffThread(
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JS::OffThreadToken** aOffThreadToken) {
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if (mSkip) {
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return mRv;
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}
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MOZ_ASSERT(!mWantsReturnValue);
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JS::Rooted<JS::InstantiationStorage> storage(mCx);
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RefPtr<JS::Stencil> stencil = JS::FinishOffThreadStencil(
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mCx, *aOffThreadToken, storage.address());
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*aOffThreadToken = nullptr; // Mark the token as having been finished.
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if (!stencil) {
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mSkip = true;
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mRv = EvaluationExceptionToNSResult(mCx);
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return mRv;
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}
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return InstantiateStencil(std::move(stencil), storage.address());
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}
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template <typename Unit>
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nsresult JSExecutionContext::InternalCompile(JS::SourceText<Unit>& aSrcBuf) {
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if (mSkip) {
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return mRv;
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}
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MOZ_ASSERT(aSrcBuf.get());
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MOZ_ASSERT(mRetValue.isUndefined());
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#ifdef DEBUG
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mWantsReturnValue = !mCompileOptions.noScriptRval;
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#endif
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RefPtr<JS::Stencil> stencil =
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CompileGlobalScriptToStencil(mCx, mCompileOptions, aSrcBuf);
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if (!stencil) {
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mSkip = true;
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mRv = EvaluationExceptionToNSResult(mCx);
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return mRv;
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}
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return InstantiateStencil(std::move(stencil));
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}
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nsresult JSExecutionContext::Compile(JS::SourceText<char16_t>& aSrcBuf) {
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return InternalCompile(aSrcBuf);
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}
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nsresult JSExecutionContext::Compile(JS::SourceText<Utf8Unit>& aSrcBuf) {
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return InternalCompile(aSrcBuf);
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}
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nsresult JSExecutionContext::Compile(const nsAString& aScript) {
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if (mSkip) {
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return mRv;
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}
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const nsPromiseFlatString& flatScript = PromiseFlatString(aScript);
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JS::SourceText<char16_t> srcBuf;
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if (!srcBuf.init(mCx, flatScript.get(), flatScript.Length(),
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JS::SourceOwnership::Borrowed)) {
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mSkip = true;
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mRv = EvaluationExceptionToNSResult(mCx);
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return mRv;
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}
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return Compile(srcBuf);
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}
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nsresult JSExecutionContext::Decode(mozilla::Vector<uint8_t>& aBytecodeBuf,
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size_t aBytecodeIndex) {
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if (mSkip) {
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return mRv;
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}
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JS::DecodeOptions decodeOptions(mCompileOptions);
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decodeOptions.borrowBuffer = true;
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JS::TranscodeRange range(aBytecodeBuf.begin() + aBytecodeIndex,
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aBytecodeBuf.length() - aBytecodeIndex);
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MOZ_ASSERT(!mWantsReturnValue);
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RefPtr<JS::Stencil> stencil;
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JS::TranscodeResult tr =
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JS::DecodeStencil(mCx, decodeOptions, range, getter_AddRefs(stencil));
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// These errors are external parameters which should be handled before the
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// decoding phase, and which are the only reasons why you might want to
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// fallback on decoding failures.
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MOZ_ASSERT(tr != JS::TranscodeResult::Failure_BadBuildId);
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if (tr != JS::TranscodeResult::Ok) {
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mSkip = true;
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mRv = NS_ERROR_DOM_JS_DECODING_ERROR;
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return mRv;
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}
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return InstantiateStencil(std::move(stencil));
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}
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nsresult JSExecutionContext::InstantiateStencil(
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RefPtr<JS::Stencil>&& aStencil, JS::InstantiationStorage* aStorage) {
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JS::InstantiateOptions instantiateOptions(mCompileOptions);
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JS::Rooted<JSScript*> script(
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mCx, JS::InstantiateGlobalStencil(mCx, instantiateOptions, aStencil,
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aStorage));
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if (!script) {
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mSkip = true;
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mRv = EvaluationExceptionToNSResult(mCx);
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return mRv;
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}
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if (mEncodeBytecode) {
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if (!JS::StartIncrementalEncoding(mCx, std::move(aStencil))) {
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mSkip = true;
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mRv = EvaluationExceptionToNSResult(mCx);
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return mRv;
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}
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}
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MOZ_ASSERT(!mScript);
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mScript.set(script);
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if (instantiateOptions.deferDebugMetadata) {
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if (!JS::UpdateDebugMetadata(mCx, mScript, instantiateOptions,
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mDebuggerPrivateValue, nullptr,
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mDebuggerIntroductionScript, nullptr)) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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}
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return NS_OK;
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}
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JSScript* JSExecutionContext::GetScript() {
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#ifdef DEBUG
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MOZ_ASSERT(!mSkip);
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MOZ_ASSERT(mScript);
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mScriptUsed = true;
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#endif
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return MaybeGetScript();
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}
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JSScript* JSExecutionContext::MaybeGetScript() { return mScript; }
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nsresult JSExecutionContext::ExecScript() {
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if (mSkip) {
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return mRv;
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}
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MOZ_ASSERT(mScript);
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if (!JS_ExecuteScript(mCx, mScript)) {
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mSkip = true;
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mRv = EvaluationExceptionToNSResult(mCx);
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return mRv;
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}
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return NS_OK;
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}
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static bool IsPromiseValue(JSContext* aCx, JS::Handle<JS::Value> aValue) {
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if (!aValue.isObject()) {
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return false;
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}
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// We only care about Promise here, so CheckedUnwrapStatic is fine.
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JS::Rooted<JSObject*> obj(aCx, js::CheckedUnwrapStatic(&aValue.toObject()));
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if (!obj) {
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return false;
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}
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return JS::IsPromiseObject(obj);
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}
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nsresult JSExecutionContext::ExecScript(
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JS::MutableHandle<JS::Value> aRetValue) {
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if (mSkip) {
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aRetValue.setUndefined();
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return mRv;
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}
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MOZ_ASSERT(mScript);
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MOZ_ASSERT(mWantsReturnValue);
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if (!JS_ExecuteScript(mCx, mScript, aRetValue)) {
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mSkip = true;
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mRv = EvaluationExceptionToNSResult(mCx);
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return mRv;
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}
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#ifdef DEBUG
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mWantsReturnValue = false;
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#endif
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if (mCoerceToString && IsPromiseValue(mCx, aRetValue)) {
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// We're a javascript: url and we should treat Promise return values as
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// undefined.
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//
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// Once bug 1477821 is fixed this code might be able to go away, or will
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// become enshrined in the spec, depending.
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aRetValue.setUndefined();
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}
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if (mCoerceToString && !aRetValue.isUndefined()) {
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JSString* str = JS::ToString(mCx, aRetValue);
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if (!str) {
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// ToString can be a function call, so an exception can be raised while
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// executing the function.
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mSkip = true;
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return EvaluationExceptionToNSResult(mCx);
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}
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aRetValue.set(JS::StringValue(str));
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}
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return NS_OK;
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}
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