mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-10-21 01:05:45 +00:00
3a10644021
Backed out changeset 83c87140dc3d (bug 888600) Backed out changeset 2efb9b1753f6 (bug 888600) Backed out changeset af5303781961 (bug 888600) Backed out changeset 79ef59047e63 (bug 888600) Backed out changeset 30d568d628dd (bug 888600) Backed out changeset c7bd4c6c9741 (bug 888600) --HG-- extra : histedit_source : 791b22f6770f4fead2f909478a93d65d85829fe0%2Cbb387309e90f53e1dde45dcf8cf4ebedcc6e5c5e
510 lines
14 KiB
C++
510 lines
14 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 "nsJSUtils.h"
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#include "jsapi.h"
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#include "jsfriendapi.h"
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#include "nsIScriptContext.h"
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#include "nsIScriptGlobalObject.h"
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#include "nsIXPConnect.h"
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#include "nsCOMPtr.h"
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#include "nsIScriptSecurityManager.h"
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#include "nsPIDOMWindow.h"
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#include "GeckoProfiler.h"
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#include "nsJSPrincipals.h"
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#include "xpcpublic.h"
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#include "nsContentUtils.h"
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#include "nsGlobalWindow.h"
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#include "mozilla/CycleCollectedJSContext.h"
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#include "mozilla/dom/BindingUtils.h"
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#include "mozilla/dom/Date.h"
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#include "mozilla/dom/Element.h"
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#include "mozilla/dom/ScriptSettings.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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bool
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nsJSUtils::GetCallingLocation(JSContext* aContext, nsACString& aFilename,
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uint32_t* aLineno, uint32_t* aColumn)
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{
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JS::AutoFilename filename;
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if (!JS::DescribeScriptedCaller(aContext, &filename, aLineno, aColumn)) {
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return false;
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}
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aFilename.Assign(filename.get());
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return true;
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}
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bool
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nsJSUtils::GetCallingLocation(JSContext* aContext, nsAString& aFilename,
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uint32_t* aLineno, uint32_t* aColumn)
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{
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JS::AutoFilename filename;
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if (!JS::DescribeScriptedCaller(aContext, &filename, aLineno, aColumn)) {
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return false;
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}
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aFilename.Assign(NS_ConvertUTF8toUTF16(filename.get()));
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return true;
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}
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nsIScriptGlobalObject *
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nsJSUtils::GetStaticScriptGlobal(JSObject* aObj)
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{
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if (!aObj)
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return nullptr;
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return xpc::WindowGlobalOrNull(aObj);
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}
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nsIScriptContext *
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nsJSUtils::GetStaticScriptContext(JSObject* aObj)
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{
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nsIScriptGlobalObject *nativeGlobal = GetStaticScriptGlobal(aObj);
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if (!nativeGlobal)
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return nullptr;
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return nativeGlobal->GetScriptContext();
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}
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uint64_t
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nsJSUtils::GetCurrentlyRunningCodeInnerWindowID(JSContext *aContext)
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{
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if (!aContext)
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return 0;
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nsGlobalWindowInner* win = xpc::CurrentWindowOrNull(aContext);
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return win ? win->WindowID() : 0;
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}
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nsresult
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nsJSUtils::CompileFunction(AutoJSAPI& jsapi,
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JS::AutoObjectVector& aScopeChain,
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JS::CompileOptions& aOptions,
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const nsACString& aName,
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uint32_t aArgCount,
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const char** aArgArray,
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const nsAString& aBody,
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JSObject** aFunctionObject)
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{
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JSContext* cx = jsapi.cx();
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MOZ_ASSERT(js::GetEnterCompartmentDepth(cx) > 0);
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MOZ_ASSERT_IF(aScopeChain.length() != 0,
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js::IsObjectInContextCompartment(aScopeChain[0], cx));
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// Do the junk Gecko is supposed to do before calling into JSAPI.
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for (size_t i = 0; i < aScopeChain.length(); ++i) {
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JS::ExposeObjectToActiveJS(aScopeChain[i]);
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}
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// Compile.
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JS::Rooted<JSFunction*> fun(cx);
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if (!JS::CompileFunction(cx, aScopeChain, aOptions,
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PromiseFlatCString(aName).get(),
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aArgCount, aArgArray,
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PromiseFlatString(aBody).get(),
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aBody.Length(), &fun))
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{
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return NS_ERROR_FAILURE;
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}
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*aFunctionObject = JS_GetFunctionObject(fun);
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return NS_OK;
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}
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static nsresult
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EvaluationExceptionToNSResult(JSContext* aCx)
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{
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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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nsJSUtils::ExecutionContext::ExecutionContext(JSContext* aCx,
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JS::Handle<JSObject*> aGlobal)
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:
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#ifdef MOZ_GECKO_PROFILER
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mAutoProfilerLabel("nsJSUtils::ExecutionContext", /* dynamicStr */ nullptr,
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__LINE__, js::ProfileEntry::Category::JS),
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#endif
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mCx(aCx)
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, mCompartment(aCx, aGlobal)
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, mRetValue(aCx)
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, mScopeChain(aCx)
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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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, mWantsReturnValue(false)
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, mExpectScopeChain(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::GetGlobalForObjectCrossCompartment(aGlobal) == 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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void
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nsJSUtils::ExecutionContext::SetScopeChain(
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const JS::AutoObjectVector& aScopeChain)
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{
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if (mSkip) {
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return;
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}
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#ifdef DEBUG
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mExpectScopeChain = true;
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#endif
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// Now make sure to wrap the scope chain into the right compartment.
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if (!mScopeChain.reserve(aScopeChain.length())) {
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mSkip = true;
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mRv = NS_ERROR_OUT_OF_MEMORY;
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return;
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}
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for (size_t i = 0; i < aScopeChain.length(); ++i) {
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JS::ExposeObjectToActiveJS(aScopeChain[i]);
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mScopeChain.infallibleAppend(aScopeChain[i]);
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if (!JS_WrapObject(mCx, mScopeChain[i])) {
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mSkip = true;
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mRv = NS_ERROR_OUT_OF_MEMORY;
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return;
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}
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}
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}
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nsresult
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nsJSUtils::ExecutionContext::JoinAndExec(void **aOffThreadToken,
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JS::MutableHandle<JSScript*> aScript)
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{
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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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MOZ_ASSERT(!mExpectScopeChain);
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aScript.set(JS::FinishOffThreadScript(mCx, *aOffThreadToken));
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*aOffThreadToken = nullptr; // Mark the token as having been finished.
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if (!aScript) {
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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 && !StartIncrementalEncoding(mCx, aScript)) {
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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 (!JS_ExecuteScript(mCx, mScopeChain, aScript)) {
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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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nsresult
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nsJSUtils::ExecutionContext::CompileAndExec(JS::CompileOptions& aCompileOptions,
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JS::SourceBufferHolder& aSrcBuf,
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JS::MutableHandle<JSScript*> aScript)
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{
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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 = !aCompileOptions.noScriptRval;
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#endif
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bool compiled = true;
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if (mScopeChain.length() == 0) {
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compiled = JS::Compile(mCx, aCompileOptions, aSrcBuf, aScript);
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} else {
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compiled = JS::CompileForNonSyntacticScope(mCx, aCompileOptions, aSrcBuf, aScript);
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}
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MOZ_ASSERT_IF(compiled, aScript);
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if (!compiled) {
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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 && !StartIncrementalEncoding(mCx, aScript)) {
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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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MOZ_ASSERT(!mCoerceToString || mWantsReturnValue);
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if (!JS_ExecuteScript(mCx, mScopeChain, aScript, &mRetValue)) {
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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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nsresult
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nsJSUtils::ExecutionContext::CompileAndExec(JS::CompileOptions& aCompileOptions,
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const nsAString& aScript)
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{
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MOZ_ASSERT(!mEncodeBytecode, "A JSScript is needed for calling FinishIncrementalEncoding");
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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::SourceBufferHolder srcBuf(flatScript.get(), aScript.Length(),
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JS::SourceBufferHolder::NoOwnership);
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JS::Rooted<JSScript*> script(mCx);
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return CompileAndExec(aCompileOptions, srcBuf, &script);
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}
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nsresult
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nsJSUtils::ExecutionContext::DecodeAndExec(JS::CompileOptions& aCompileOptions,
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mozilla::Vector<uint8_t>& aBytecodeBuf,
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size_t aBytecodeIndex)
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{
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MOZ_ASSERT(!mEncodeBytecode, "A JSScript is needed for calling FinishIncrementalEncoding");
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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<JSScript*> script(mCx);
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JS::TranscodeResult tr = JS::DecodeScript(mCx, aBytecodeBuf, &script, aBytecodeIndex);
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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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tr != JS::TranscodeResult_Failure_WrongCompileOption);
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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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if (!JS_ExecuteScript(mCx, mScopeChain, 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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return mRv;
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}
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nsresult
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nsJSUtils::ExecutionContext::DecodeJoinAndExec(void **aOffThreadToken)
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{
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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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MOZ_ASSERT(!mExpectScopeChain);
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JS::Rooted<JSScript*> script(mCx);
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script.set(JS::FinishOffThreadScriptDecoder(mCx, *aOffThreadToken));
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*aOffThreadToken = nullptr; // Mark the token as having been finished.
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if (!script || !JS_ExecuteScript(mCx, mScopeChain, 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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return NS_OK;
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}
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nsresult
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nsJSUtils::ExecutionContext::ExtractReturnValue(JS::MutableHandle<JS::Value> aRetValue)
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{
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MOZ_ASSERT(aRetValue.isUndefined());
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if (mSkip) {
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// Repeat earlier result, as NS_SUCCESS_DOM_SCRIPT_EVALUATION_THREW are not
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// failures cases.
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#ifdef DEBUG
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mWantsReturnValue = false;
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#endif
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return mRv;
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}
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MOZ_ASSERT(mWantsReturnValue);
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#ifdef DEBUG
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mWantsReturnValue = false;
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#endif
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if (mCoerceToString && !mRetValue.isUndefined()) {
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JSString* str = JS::ToString(mCx, mRetValue);
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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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mRetValue.set(JS::StringValue(str));
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}
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aRetValue.set(mRetValue);
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return NS_OK;
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}
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nsresult
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nsJSUtils::CompileModule(JSContext* aCx,
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JS::SourceBufferHolder& aSrcBuf,
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JS::Handle<JSObject*> aEvaluationGlobal,
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JS::CompileOptions &aCompileOptions,
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JS::MutableHandle<JSObject*> aModule)
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{
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AUTO_PROFILER_LABEL("nsJSUtils::CompileModule", JS);
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MOZ_ASSERT(aCx == nsContentUtils::GetCurrentJSContext());
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MOZ_ASSERT(aSrcBuf.get());
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MOZ_ASSERT(js::GetGlobalForObjectCrossCompartment(aEvaluationGlobal) ==
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aEvaluationGlobal);
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MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx) == aEvaluationGlobal);
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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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NS_ENSURE_TRUE(xpc::Scriptability::Get(aEvaluationGlobal).Allowed(), NS_OK);
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if (!JS::CompileModule(aCx, aCompileOptions, aSrcBuf, aModule)) {
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return NS_ERROR_FAILURE;
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}
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return NS_OK;
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}
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nsresult
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nsJSUtils::InitModuleSourceElement(JSContext* aCx,
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JS::Handle<JSObject*> aModule,
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nsIScriptElement* aElement)
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{
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JS::Rooted<JS::Value> value(aCx);
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nsresult rv = nsContentUtils::WrapNative(aCx, aElement, &value,
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/* aAllowWrapping = */ true);
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if (NS_FAILED(rv)) {
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return rv;
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}
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MOZ_ASSERT(value.isObject());
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JS::Rooted<JSObject*> object(aCx, &value.toObject());
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JS::Rooted<JSScript*> script(aCx, JS::GetModuleScript(aModule));
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if (!JS::InitScriptSourceElement(aCx, script, object, nullptr)) {
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return NS_ERROR_FAILURE;
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}
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return NS_OK;
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}
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nsresult
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nsJSUtils::ModuleInstantiate(JSContext* aCx, JS::Handle<JSObject*> aModule)
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{
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AUTO_PROFILER_LABEL("nsJSUtils::ModuleInstantiate", JS);
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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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NS_ENSURE_TRUE(xpc::Scriptability::Get(aModule).Allowed(), NS_OK);
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if (!JS::ModuleInstantiate(aCx, aModule)) {
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return NS_ERROR_FAILURE;
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}
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return NS_OK;
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}
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nsresult
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nsJSUtils::ModuleEvaluate(JSContext* aCx, JS::Handle<JSObject*> aModule)
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{
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AUTO_PROFILER_LABEL("nsJSUtils::ModuleEvaluate", JS);
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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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NS_ENSURE_TRUE(xpc::Scriptability::Get(aModule).Allowed(), NS_OK);
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if (!JS::ModuleEvaluate(aCx, aModule)) {
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return NS_ERROR_FAILURE;
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}
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return NS_OK;
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}
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/* static */
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bool
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nsJSUtils::GetScopeChainForElement(JSContext* aCx,
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mozilla::dom::Element* aElement,
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JS::AutoObjectVector& aScopeChain)
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{
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for (nsINode* cur = aElement; cur; cur = cur->GetScopeChainParent()) {
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JS::RootedValue val(aCx);
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if (!GetOrCreateDOMReflector(aCx, cur, &val)) {
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return false;
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}
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if (!aScopeChain.append(&val.toObject())) {
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return false;
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}
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}
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return true;
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}
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/* static */
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void
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nsJSUtils::ResetTimeZone()
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{
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JS::ResetTimeZone();
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}
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//
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// nsDOMJSUtils.h
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//
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bool nsAutoJSString::init(const JS::Value &v)
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{
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// Note: it's okay to use danger::GetJSContext here instead of AutoJSAPI,
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// because the init() call below is careful not to run script (for instance,
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// it only calls JS::ToString for non-object values).
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JSContext* cx = danger::GetJSContext();
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if (!init(cx, v)) {
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JS_ClearPendingException(cx);
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return false;
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}
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return true;
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}
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