gecko-dev/dom/base/nsJSUtils.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/. */
/**
* This is not a generated file. It contains common utility functions
* invoked from the JavaScript code generated from IDL interfaces.
* The goal of the utility functions is to cut down on the size of
* the generated code itself.
*/
#include "nsJSUtils.h"
#include "jsapi.h"
#include "jsfriendapi.h"
#include "js/CompilationAndEvaluation.h"
#include "js/Modules.h" // JS::CompileModule{,DontInflate}, JS::GetModuleScript, JS::Module{Instantiate,Evaluate}
#include "js/OffThreadScriptCompilation.h"
#include "js/SourceText.h"
#include "nsIScriptContext.h"
#include "nsIScriptElement.h"
#include "nsIScriptGlobalObject.h"
#include "nsIXPConnect.h"
#include "nsCOMPtr.h"
#include "nsIScriptSecurityManager.h"
#include "nsPIDOMWindow.h"
#include "GeckoProfiler.h"
#include "nsJSPrincipals.h"
#include "xpcpublic.h"
#include "nsContentUtils.h"
#include "nsGlobalWindow.h"
#include "nsXBLPrototypeBinding.h"
#include "mozilla/CycleCollectedJSContext.h"
#include "mozilla/StaticPrefs_browser.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/Date.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/Utf8.h" // mozilla::Utf8Unit
using namespace mozilla;
using namespace mozilla::dom;
bool nsJSUtils::GetCallingLocation(JSContext* aContext, nsACString& aFilename,
uint32_t* aLineno, uint32_t* aColumn) {
JS::AutoFilename filename;
if (!JS::DescribeScriptedCaller(aContext, &filename, aLineno, aColumn)) {
return false;
}
aFilename.Assign(filename.get());
return true;
}
bool nsJSUtils::GetCallingLocation(JSContext* aContext, nsAString& aFilename,
uint32_t* aLineno, uint32_t* aColumn) {
JS::AutoFilename filename;
if (!JS::DescribeScriptedCaller(aContext, &filename, aLineno, aColumn)) {
return false;
}
aFilename.Assign(NS_ConvertUTF8toUTF16(filename.get()));
return true;
}
uint64_t nsJSUtils::GetCurrentlyRunningCodeInnerWindowID(JSContext* aContext) {
if (!aContext) return 0;
nsGlobalWindowInner* win = xpc::CurrentWindowOrNull(aContext);
return win ? win->WindowID() : 0;
}
nsresult nsJSUtils::CompileFunction(AutoJSAPI& jsapi,
JS::HandleVector<JSObject*> aScopeChain,
JS::CompileOptions& aOptions,
const nsACString& aName, uint32_t aArgCount,
const char** aArgArray,
const nsAString& aBody,
JSObject** aFunctionObject) {
JSContext* cx = jsapi.cx();
MOZ_ASSERT(js::GetContextRealm(cx));
MOZ_ASSERT_IF(aScopeChain.length() != 0,
js::IsObjectInContextCompartment(aScopeChain[0], cx));
// Do the junk Gecko is supposed to do before calling into JSAPI.
for (size_t i = 0; i < aScopeChain.length(); ++i) {
JS::ExposeObjectToActiveJS(aScopeChain[i]);
}
// Compile.
const nsPromiseFlatString& flatBody = PromiseFlatString(aBody);
JS::SourceText<char16_t> source;
if (!source.init(cx, flatBody.get(), flatBody.Length(),
JS::SourceOwnership::Borrowed)) {
return NS_ERROR_FAILURE;
}
JS::Rooted<JSFunction*> fun(
cx, JS::CompileFunction(cx, aScopeChain, aOptions,
PromiseFlatCString(aName).get(), aArgCount,
aArgArray, source));
if (!fun) {
return NS_ERROR_FAILURE;
}
*aFunctionObject = JS_GetFunctionObject(fun);
return NS_OK;
}
static nsresult EvaluationExceptionToNSResult(JSContext* aCx) {
if (JS_IsExceptionPending(aCx)) {
return NS_SUCCESS_DOM_SCRIPT_EVALUATION_THREW;
}
return NS_SUCCESS_DOM_SCRIPT_EVALUATION_THREW_UNCATCHABLE;
}
nsJSUtils::ExecutionContext::ExecutionContext(JSContext* aCx,
JS::Handle<JSObject*> aGlobal)
:
#ifdef MOZ_GECKO_PROFILER
mAutoProfilerLabel("nsJSUtils::ExecutionContext",
/* dynamicStr */ nullptr,
JS::ProfilingCategoryPair::JS),
#endif
mCx(aCx),
mRealm(aCx, aGlobal),
mRetValue(aCx),
mScopeChain(aCx),
mScript(aCx),
mRv(NS_OK),
mSkip(false),
mCoerceToString(false),
mEncodeBytecode(false)
#ifdef DEBUG
,
mWantsReturnValue(false),
mExpectScopeChain(false),
mScriptUsed(false)
#endif
{
MOZ_ASSERT(aCx == nsContentUtils::GetCurrentJSContext());
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(CycleCollectedJSContext::Get() &&
CycleCollectedJSContext::Get()->MicroTaskLevel());
MOZ_ASSERT(mRetValue.isUndefined());
MOZ_ASSERT(JS_IsGlobalObject(aGlobal));
if (MOZ_UNLIKELY(!xpc::Scriptability::Get(aGlobal).Allowed())) {
mSkip = true;
mRv = NS_OK;
}
}
void nsJSUtils::ExecutionContext::SetScopeChain(
JS::HandleVector<JSObject*> aScopeChain) {
if (mSkip) {
return;
}
#ifdef DEBUG
mExpectScopeChain = true;
#endif
// Now make sure to wrap the scope chain into the right compartment.
if (!mScopeChain.reserve(aScopeChain.length())) {
mSkip = true;
mRv = NS_ERROR_OUT_OF_MEMORY;
return;
}
for (size_t i = 0; i < aScopeChain.length(); ++i) {
JS::ExposeObjectToActiveJS(aScopeChain[i]);
mScopeChain.infallibleAppend(aScopeChain[i]);
if (!JS_WrapObject(mCx, mScopeChain[i])) {
mSkip = true;
mRv = NS_ERROR_OUT_OF_MEMORY;
return;
}
}
}
nsresult nsJSUtils::ExecutionContext::JoinCompile(
JS::OffThreadToken** aOffThreadToken) {
if (mSkip) {
return mRv;
}
MOZ_ASSERT(!mWantsReturnValue);
MOZ_ASSERT(!mExpectScopeChain);
MOZ_ASSERT(!mScript);
mScript.set(JS::FinishOffThreadScript(mCx, *aOffThreadToken));
*aOffThreadToken = nullptr; // Mark the token as having been finished.
if (!mScript) {
mSkip = true;
mRv = EvaluationExceptionToNSResult(mCx);
return mRv;
}
if (mEncodeBytecode && !StartIncrementalEncoding(mCx, mScript)) {
mSkip = true;
mRv = EvaluationExceptionToNSResult(mCx);
return mRv;
}
return NS_OK;
}
static JSScript* CompileScript(
JSContext* aCx, JS::Handle<JS::StackGCVector<JSObject*>> aScopeChain,
JS::CompileOptions& aCompileOptions, JS::SourceText<char16_t>& aSrcBuf) {
return aScopeChain.length() == 0
? JS::Compile(aCx, aCompileOptions, aSrcBuf)
: JS::CompileForNonSyntacticScope(aCx, aCompileOptions, aSrcBuf);
}
static JSScript* CompileScript(
JSContext* aCx, JS::Handle<JS::StackGCVector<JSObject*>> aScopeChain,
JS::CompileOptions& aCompileOptions, JS::SourceText<Utf8Unit>& aSrcBuf) {
// Once the UTF-8 overloads don't inflate, we can get rid of these two
// |CompileScript| overloads and just call the JSAPI directly in the one
// caller.
return aScopeChain.length() == 0
? JS::CompileDontInflate(aCx, aCompileOptions, aSrcBuf)
: JS::CompileForNonSyntacticScopeDontInflate(aCx, aCompileOptions,
aSrcBuf);
}
template <typename Unit>
nsresult nsJSUtils::ExecutionContext::InternalCompile(
JS::CompileOptions& aCompileOptions, JS::SourceText<Unit>& aSrcBuf) {
if (mSkip) {
return mRv;
}
MOZ_ASSERT(aSrcBuf.get());
MOZ_ASSERT(mRetValue.isUndefined());
#ifdef DEBUG
mWantsReturnValue = !aCompileOptions.noScriptRval;
#endif
MOZ_ASSERT(!mScript);
mScript = CompileScript(mCx, mScopeChain, aCompileOptions, aSrcBuf);
if (!mScript) {
mSkip = true;
mRv = EvaluationExceptionToNSResult(mCx);
return mRv;
}
if (mEncodeBytecode && !StartIncrementalEncoding(mCx, mScript)) {
mSkip = true;
mRv = EvaluationExceptionToNSResult(mCx);
return mRv;
}
return NS_OK;
}
nsresult nsJSUtils::ExecutionContext::Compile(
JS::CompileOptions& aCompileOptions, JS::SourceText<char16_t>& aSrcBuf) {
return InternalCompile(aCompileOptions, aSrcBuf);
}
nsresult nsJSUtils::ExecutionContext::Compile(
JS::CompileOptions& aCompileOptions, JS::SourceText<Utf8Unit>& aSrcBuf) {
return InternalCompile(aCompileOptions, aSrcBuf);
}
nsresult nsJSUtils::ExecutionContext::Compile(
JS::CompileOptions& aCompileOptions, const nsAString& aScript) {
if (mSkip) {
return mRv;
}
const nsPromiseFlatString& flatScript = PromiseFlatString(aScript);
JS::SourceText<char16_t> srcBuf;
if (!srcBuf.init(mCx, flatScript.get(), flatScript.Length(),
JS::SourceOwnership::Borrowed)) {
mSkip = true;
mRv = EvaluationExceptionToNSResult(mCx);
return mRv;
}
return Compile(aCompileOptions, srcBuf);
}
nsresult nsJSUtils::ExecutionContext::Decode(
JS::CompileOptions& aCompileOptions, mozilla::Vector<uint8_t>& aBytecodeBuf,
size_t aBytecodeIndex) {
if (mSkip) {
return mRv;
}
MOZ_ASSERT(!mWantsReturnValue);
JS::TranscodeResult tr =
JS::DecodeScript(mCx, aBytecodeBuf, &mScript, aBytecodeIndex);
// These errors are external parameters which should be handled before the
// decoding phase, and which are the only reasons why you might want to
// fallback on decoding failures.
MOZ_ASSERT(tr != JS::TranscodeResult_Failure_BadBuildId &&
tr != JS::TranscodeResult_Failure_WrongCompileOption);
if (tr != JS::TranscodeResult_Ok) {
mSkip = true;
mRv = NS_ERROR_DOM_JS_DECODING_ERROR;
return mRv;
}
return mRv;
}
nsresult nsJSUtils::ExecutionContext::JoinDecode(
JS::OffThreadToken** aOffThreadToken) {
if (mSkip) {
return mRv;
}
MOZ_ASSERT(!mWantsReturnValue);
MOZ_ASSERT(!mExpectScopeChain);
mScript.set(JS::FinishOffThreadScriptDecoder(mCx, *aOffThreadToken));
*aOffThreadToken = nullptr; // Mark the token as having been finished.
if (!mScript) {
mSkip = true;
mRv = EvaluationExceptionToNSResult(mCx);
return mRv;
}
return NS_OK;
}
nsresult nsJSUtils::ExecutionContext::JoinDecodeBinAST(
JS::OffThreadToken** aOffThreadToken) {
#ifdef JS_BUILD_BINAST
if (mSkip) {
return mRv;
}
MOZ_ASSERT(!mWantsReturnValue);
MOZ_ASSERT(!mExpectScopeChain);
mScript.set(JS::FinishOffThreadBinASTDecode(mCx, *aOffThreadToken));
*aOffThreadToken = nullptr; // Mark the token as having been finished.
if (!mScript) {
mSkip = true;
mRv = EvaluationExceptionToNSResult(mCx);
return mRv;
}
if (mEncodeBytecode && !StartIncrementalEncoding(mCx, mScript)) {
mSkip = true;
mRv = EvaluationExceptionToNSResult(mCx);
return mRv;
}
return NS_OK;
#else
return NS_ERROR_NOT_IMPLEMENTED;
#endif
}
nsresult nsJSUtils::ExecutionContext::DecodeBinAST(
JS::CompileOptions& aCompileOptions, const uint8_t* aBuf, size_t aLength) {
#ifdef JS_BUILD_BINAST
MOZ_ASSERT(mScopeChain.length() == 0,
"BinAST decoding is not supported in non-syntactic scopes");
if (mSkip) {
return mRv;
}
MOZ_ASSERT(aBuf);
MOZ_ASSERT(mRetValue.isUndefined());
# ifdef DEBUG
mWantsReturnValue = !aCompileOptions.noScriptRval;
# endif
mScript.set(JS::DecodeBinAST(mCx, aCompileOptions, aBuf, aLength));
if (!mScript) {
mSkip = true;
mRv = EvaluationExceptionToNSResult(mCx);
return mRv;
}
if (mEncodeBytecode && !StartIncrementalEncoding(mCx, mScript)) {
mSkip = true;
mRv = EvaluationExceptionToNSResult(mCx);
return mRv;
}
return NS_OK;
#else
return NS_ERROR_NOT_IMPLEMENTED;
#endif
}
JSScript* nsJSUtils::ExecutionContext::GetScript() {
#ifdef DEBUG
MOZ_ASSERT(!mSkip);
MOZ_ASSERT(mScript);
mScriptUsed = true;
#endif
return MaybeGetScript();
}
JSScript* nsJSUtils::ExecutionContext::MaybeGetScript() { return mScript; }
nsresult nsJSUtils::ExecutionContext::ExecScript() {
if (mSkip) {
return mRv;
}
MOZ_ASSERT(mScript);
if (!JS_ExecuteScript(mCx, mScopeChain, mScript)) {
mSkip = true;
mRv = EvaluationExceptionToNSResult(mCx);
return mRv;
}
return NS_OK;
}
static bool IsPromiseValue(JSContext* aCx, JS::Handle<JS::Value> aValue) {
if (!aValue.isObject()) {
return false;
}
// We only care about Promise here, so CheckedUnwrapStatic is fine.
JS::Rooted<JSObject*> obj(aCx, js::CheckedUnwrapStatic(&aValue.toObject()));
if (!obj) {
return false;
}
return JS::IsPromiseObject(obj);
}
nsresult nsJSUtils::ExecutionContext::ExecScript(
JS::MutableHandle<JS::Value> aRetValue) {
if (mSkip) {
aRetValue.setUndefined();
return mRv;
}
MOZ_ASSERT(mScript);
MOZ_ASSERT(mWantsReturnValue);
if (!JS_ExecuteScript(mCx, mScopeChain, mScript, aRetValue)) {
mSkip = true;
mRv = EvaluationExceptionToNSResult(mCx);
return mRv;
}
#ifdef DEBUG
mWantsReturnValue = false;
#endif
if (mCoerceToString && IsPromiseValue(mCx, aRetValue)) {
// We're a javascript: url and we should treat Promise return values as
// undefined.
//
// Once bug 1477821 is fixed this code might be able to go away, or will
// become enshrined in the spec, depending.
aRetValue.setUndefined();
}
if (mCoerceToString && !aRetValue.isUndefined()) {
JSString* str = JS::ToString(mCx, aRetValue);
if (!str) {
// ToString can be a function call, so an exception can be raised while
// executing the function.
mSkip = true;
return EvaluationExceptionToNSResult(mCx);
}
aRetValue.set(JS::StringValue(str));
}
return NS_OK;
}
static JSObject* CompileModule(JSContext* aCx,
JS::CompileOptions& aCompileOptions,
JS::SourceText<char16_t>& aSrcBuf) {
return JS::CompileModule(aCx, aCompileOptions, aSrcBuf);
}
static JSObject* CompileModule(JSContext* aCx,
JS::CompileOptions& aCompileOptions,
JS::SourceText<Utf8Unit>& aSrcBuf) {
// Once compile-UTF-8-without-inflating is stable, it'll be renamed to remove
// the "DontInflate" suffix, these two overloads can be removed, and
// |JS::CompileModule| can be used in the sole caller below.
return JS::CompileModuleDontInflate(aCx, aCompileOptions, aSrcBuf);
}
template <typename Unit>
static nsresult CompileJSModule(JSContext* aCx, JS::SourceText<Unit>& aSrcBuf,
JS::Handle<JSObject*> aEvaluationGlobal,
JS::CompileOptions& aCompileOptions,
JS::MutableHandle<JSObject*> aModule) {
AUTO_PROFILER_LABEL("nsJSUtils::CompileModule", JS);
MOZ_ASSERT(aCx == nsContentUtils::GetCurrentJSContext());
MOZ_ASSERT(aSrcBuf.get());
MOZ_ASSERT(JS_IsGlobalObject(aEvaluationGlobal));
MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx) == aEvaluationGlobal);
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(CycleCollectedJSContext::Get() &&
CycleCollectedJSContext::Get()->MicroTaskLevel());
NS_ENSURE_TRUE(xpc::Scriptability::Get(aEvaluationGlobal).Allowed(), NS_OK);
JSObject* module = CompileModule(aCx, aCompileOptions, aSrcBuf);
if (!module) {
return NS_ERROR_FAILURE;
}
aModule.set(module);
return NS_OK;
}
nsresult nsJSUtils::CompileModule(JSContext* aCx,
JS::SourceText<char16_t>& aSrcBuf,
JS::Handle<JSObject*> aEvaluationGlobal,
JS::CompileOptions& aCompileOptions,
JS::MutableHandle<JSObject*> aModule) {
return CompileJSModule(aCx, aSrcBuf, aEvaluationGlobal, aCompileOptions,
aModule);
}
nsresult nsJSUtils::CompileModule(JSContext* aCx,
JS::SourceText<Utf8Unit>& aSrcBuf,
JS::Handle<JSObject*> aEvaluationGlobal,
JS::CompileOptions& aCompileOptions,
JS::MutableHandle<JSObject*> aModule) {
return CompileJSModule(aCx, aSrcBuf, aEvaluationGlobal, aCompileOptions,
aModule);
}
nsresult nsJSUtils::InitModuleSourceElement(JSContext* aCx,
JS::Handle<JSObject*> aModule,
nsIScriptElement* aElement) {
JS::Rooted<JS::Value> value(aCx);
nsresult rv = nsContentUtils::WrapNative(aCx, aElement, &value,
/* aAllowWrapping = */ true);
if (NS_FAILED(rv)) {
return rv;
}
MOZ_ASSERT(value.isObject());
JS::Rooted<JSObject*> object(aCx, &value.toObject());
JS::Rooted<JSScript*> script(aCx, JS::GetModuleScript(aModule));
if (!JS::InitScriptSourceElement(aCx, script, object, nullptr)) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
nsresult nsJSUtils::ModuleInstantiate(JSContext* aCx,
JS::Handle<JSObject*> aModule) {
AUTO_PROFILER_LABEL("nsJSUtils::ModuleInstantiate", JS);
MOZ_ASSERT(aCx == nsContentUtils::GetCurrentJSContext());
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(CycleCollectedJSContext::Get() &&
CycleCollectedJSContext::Get()->MicroTaskLevel());
NS_ENSURE_TRUE(xpc::Scriptability::Get(aModule).Allowed(), NS_OK);
if (!JS::ModuleInstantiate(aCx, aModule)) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
nsresult nsJSUtils::ModuleEvaluate(JSContext* aCx,
JS::Handle<JSObject*> aModule) {
AUTO_PROFILER_LABEL("nsJSUtils::ModuleEvaluate", JS);
MOZ_ASSERT(aCx == nsContentUtils::GetCurrentJSContext());
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(CycleCollectedJSContext::Get() &&
CycleCollectedJSContext::Get()->MicroTaskLevel());
NS_ENSURE_TRUE(xpc::Scriptability::Get(aModule).Allowed(), NS_OK);
if (!JS::ModuleEvaluate(aCx, aModule)) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
static bool AddScopeChainItem(JSContext* aCx, nsINode* aNode,
JS::MutableHandleVector<JSObject*> aScopeChain) {
JS::RootedValue val(aCx);
if (!GetOrCreateDOMReflector(aCx, aNode, &val)) {
return false;
}
if (!aScopeChain.append(&val.toObject())) {
return false;
}
return true;
}
/* static */
bool nsJSUtils::GetScopeChainForElement(
JSContext* aCx, Element* aElement,
JS::MutableHandleVector<JSObject*> aScopeChain) {
for (nsINode* cur = aElement; cur; cur = cur->GetScopeChainParent()) {
if (!AddScopeChainItem(aCx, cur, aScopeChain)) {
return false;
}
}
return true;
}
/* static */
bool nsJSUtils::GetScopeChainForXBL(
JSContext* aCx, Element* aElement,
const nsXBLPrototypeBinding& aProtoBinding,
JS::MutableHandleVector<JSObject*> aScopeChain) {
if (!aElement) {
return true;
}
if (!aProtoBinding.SimpleScopeChain()) {
return GetScopeChainForElement(aCx, aElement, aScopeChain);
}
if (!AddScopeChainItem(aCx, aElement, aScopeChain)) {
return false;
}
if (!AddScopeChainItem(aCx, aElement->OwnerDoc(), aScopeChain)) {
return false;
}
return true;
}
/* static */
void nsJSUtils::ResetTimeZone() { JS::ResetTimeZone(); }
/* static */
bool nsJSUtils::DumpEnabled() {
#if defined(DEBUG) || defined(MOZ_ENABLE_JS_DUMP)
return true;
#else
return StaticPrefs::browser_dom_window_dump_enabled();
#endif
}
//
// nsDOMJSUtils.h
//
bool nsAutoJSString::init(const JS::Value& v) {
// Note: it's okay to use danger::GetJSContext here instead of AutoJSAPI,
// because the init() call below is careful not to run script (for instance,
// it only calls JS::ToString for non-object values).
JSContext* cx = danger::GetJSContext();
if (!init(cx, v)) {
JS_ClearPendingException(cx);
return false;
}
return true;
}