https://github.com/mozilla/gecko-dev
Tip revision: 79bc6fa50f588d5ebc6daa726ebebf88a4e4c3c6 authored by Nika Layzell on 21 March 2024, 19:35:40 UTC
Bug 1886852 - Avoid registering unnecessary MessageManager listeners when SHIP is enabled, r=smaug, a=dsmith
Bug 1886852 - Avoid registering unnecessary MessageManager listeners when SHIP is enabled, r=smaug, a=dsmith
Tip revision: 79bc6fa
jsapi.cpp
/* -*- 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/. */
/*
* JavaScript API.
*/
#include "jsapi.h"
#include "mozilla/FloatingPoint.h"
#include "mozilla/Maybe.h"
#include "mozilla/PodOperations.h"
#include "mozilla/Sprintf.h"
#include <algorithm>
#include <cstdarg>
#ifdef __linux__
# include <dlfcn.h>
#endif
#include <iterator>
#include <stdarg.h>
#include <string.h>
#include "jsexn.h"
#include "jsfriendapi.h"
#include "jsmath.h"
#include "jstypes.h"
#include "builtin/AtomicsObject.h"
#include "builtin/Eval.h"
#include "builtin/JSON.h"
#include "builtin/Promise.h"
#include "builtin/Symbol.h"
#include "frontend/BytecodeCompiler.h"
#include "frontend/FrontendContext.h" // AutoReportFrontendContext
#include "gc/GC.h"
#include "gc/GCContext.h"
#include "gc/Marking.h"
#include "gc/PublicIterators.h"
#include "jit/JitSpewer.h"
#include "js/CallAndConstruct.h" // JS::IsCallable
#include "js/CharacterEncoding.h"
#include "js/CompileOptions.h"
#include "js/ContextOptions.h" // JS::ContextOptions{,Ref}
#include "js/Conversions.h"
#include "js/ErrorInterceptor.h"
#include "js/friend/ErrorMessages.h" // js::GetErrorMessage, JSMSG_*
#include "js/friend/StackLimits.h" // js::AutoCheckRecursionLimit
#include "js/GlobalObject.h"
#include "js/Initialization.h"
#include "js/Interrupt.h"
#include "js/JSON.h"
#include "js/LocaleSensitive.h"
#include "js/MemoryCallbacks.h"
#include "js/MemoryFunctions.h"
#include "js/PropertySpec.h"
#include "js/Proxy.h"
#include "js/ScriptPrivate.h"
#include "js/StableStringChars.h"
#include "js/Stack.h" // JS::NativeStackSize, JS::NativeStackLimitMax, JS::GetNativeStackLimit
#include "js/StreamConsumer.h"
#include "js/String.h" // JS::MaxStringLength
#include "js/Symbol.h"
#include "js/TelemetryTimers.h"
#include "js/Utility.h"
#include "js/WaitCallbacks.h"
#include "js/WasmModule.h"
#include "js/Wrapper.h"
#include "js/WrapperCallbacks.h"
#include "proxy/DOMProxy.h"
#include "util/StringBuffer.h"
#include "util/Text.h"
#include "vm/BoundFunctionObject.h"
#include "vm/EnvironmentObject.h"
#include "vm/ErrorObject.h"
#include "vm/ErrorReporting.h"
#include "vm/FunctionPrefixKind.h"
#include "vm/Interpreter.h"
#include "vm/JSAtom.h"
#include "vm/JSAtomState.h"
#include "vm/JSContext.h"
#include "vm/JSFunction.h"
#include "vm/JSObject.h"
#include "vm/JSScript.h"
#include "vm/PlainObject.h" // js::PlainObject
#include "vm/PromiseObject.h" // js::PromiseObject
#include "vm/Runtime.h"
#include "vm/SavedStacks.h"
#include "vm/StringType.h"
#include "vm/Time.h"
#include "vm/ToSource.h"
#include "vm/WrapperObject.h"
#include "wasm/WasmModule.h"
#include "wasm/WasmProcess.h"
#include "builtin/Promise-inl.h"
#include "debugger/DebugAPI-inl.h"
#include "vm/Compartment-inl.h"
#include "vm/Interpreter-inl.h"
#include "vm/IsGivenTypeObject-inl.h" // js::IsGivenTypeObject
#include "vm/JSAtom-inl.h"
#include "vm/JSFunction-inl.h"
#include "vm/JSScript-inl.h"
#include "vm/NativeObject-inl.h"
#include "vm/SavedStacks-inl.h"
#include "vm/StringType-inl.h"
using namespace js;
using mozilla::Maybe;
using mozilla::PodCopy;
using mozilla::Some;
using JS::AutoStableStringChars;
using JS::CompileOptions;
using JS::ReadOnlyCompileOptions;
using JS::SourceText;
// See preprocessor definition of JS_BITS_PER_WORD in jstypes.h; make sure
// JS_64BIT (used internally) agrees with it
#ifdef JS_64BIT
static_assert(JS_BITS_PER_WORD == 64, "values must be in sync");
#else
static_assert(JS_BITS_PER_WORD == 32, "values must be in sync");
#endif
JS_PUBLIC_API void JS::CallArgs::reportMoreArgsNeeded(JSContext* cx,
const char* fnname,
unsigned required,
unsigned actual) {
char requiredArgsStr[40];
SprintfLiteral(requiredArgsStr, "%u", required);
char actualArgsStr[40];
SprintfLiteral(actualArgsStr, "%u", actual);
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
JSMSG_MORE_ARGS_NEEDED, fnname, requiredArgsStr,
required == 1 ? "" : "s", actualArgsStr);
}
static bool ErrorTakesArguments(unsigned msg) {
MOZ_ASSERT(msg < JSErr_Limit);
unsigned argCount = js_ErrorFormatString[msg].argCount;
MOZ_ASSERT(argCount <= 2);
return argCount == 1 || argCount == 2;
}
static bool ErrorTakesObjectArgument(unsigned msg) {
MOZ_ASSERT(msg < JSErr_Limit);
unsigned argCount = js_ErrorFormatString[msg].argCount;
MOZ_ASSERT(argCount <= 2);
return argCount == 2;
}
bool JS::ObjectOpResult::reportError(JSContext* cx, HandleObject obj,
HandleId id) {
static_assert(unsigned(OkCode) == unsigned(JSMSG_NOT_AN_ERROR),
"unsigned value of OkCode must not be an error code");
MOZ_ASSERT(code_ != Uninitialized);
MOZ_ASSERT(!ok());
cx->check(obj);
if (code_ == JSMSG_OBJECT_NOT_EXTENSIBLE) {
RootedValue val(cx, ObjectValue(*obj));
return ReportValueError(cx, code_, JSDVG_IGNORE_STACK, val, nullptr);
}
if (ErrorTakesArguments(code_)) {
UniqueChars propName =
IdToPrintableUTF8(cx, id, IdToPrintableBehavior::IdIsPropertyKey);
if (!propName) {
return false;
}
if (code_ == JSMSG_SET_NON_OBJECT_RECEIVER) {
// We know that the original receiver was a primitive, so unbox it.
RootedValue val(cx, ObjectValue(*obj));
if (!obj->is<ProxyObject>()) {
if (!Unbox(cx, obj, &val)) {
return false;
}
}
return ReportValueError(cx, code_, JSDVG_IGNORE_STACK, val, nullptr,
propName.get());
}
if (ErrorTakesObjectArgument(code_)) {
JSObject* unwrapped = js::CheckedUnwrapStatic(obj);
const char* name = unwrapped ? unwrapped->getClass()->name : "Object";
JS_ReportErrorNumberUTF8(cx, GetErrorMessage, nullptr, code_, name,
propName.get());
return false;
}
JS_ReportErrorNumberUTF8(cx, GetErrorMessage, nullptr, code_,
propName.get());
return false;
}
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, code_);
return false;
}
bool JS::ObjectOpResult::reportError(JSContext* cx, HandleObject obj) {
MOZ_ASSERT(code_ != Uninitialized);
MOZ_ASSERT(!ok());
MOZ_ASSERT(!ErrorTakesArguments(code_));
cx->check(obj);
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr, code_);
return false;
}
JS_PUBLIC_API bool JS::ObjectOpResult::failCantRedefineProp() {
return fail(JSMSG_CANT_REDEFINE_PROP);
}
JS_PUBLIC_API bool JS::ObjectOpResult::failReadOnly() {
return fail(JSMSG_READ_ONLY);
}
JS_PUBLIC_API bool JS::ObjectOpResult::failGetterOnly() {
return fail(JSMSG_GETTER_ONLY);
}
JS_PUBLIC_API bool JS::ObjectOpResult::failCantDelete() {
return fail(JSMSG_CANT_DELETE);
}
JS_PUBLIC_API bool JS::ObjectOpResult::failCantSetInterposed() {
return fail(JSMSG_CANT_SET_INTERPOSED);
}
JS_PUBLIC_API bool JS::ObjectOpResult::failCantDefineWindowElement() {
return fail(JSMSG_CANT_DEFINE_WINDOW_ELEMENT);
}
JS_PUBLIC_API bool JS::ObjectOpResult::failCantDeleteWindowElement() {
return fail(JSMSG_CANT_DELETE_WINDOW_ELEMENT);
}
JS_PUBLIC_API bool JS::ObjectOpResult::failCantDefineWindowNamedProperty() {
return fail(JSMSG_CANT_DEFINE_WINDOW_NAMED_PROPERTY);
}
JS_PUBLIC_API bool JS::ObjectOpResult::failCantDeleteWindowNamedProperty() {
return fail(JSMSG_CANT_DELETE_WINDOW_NAMED_PROPERTY);
}
JS_PUBLIC_API bool JS::ObjectOpResult::failCantDefineWindowNonConfigurable() {
return fail(JSMSG_CANT_DEFINE_WINDOW_NC);
}
JS_PUBLIC_API bool JS::ObjectOpResult::failCantPreventExtensions() {
return fail(JSMSG_CANT_PREVENT_EXTENSIONS);
}
JS_PUBLIC_API bool JS::ObjectOpResult::failCantSetProto() {
return fail(JSMSG_CANT_SET_PROTO);
}
JS_PUBLIC_API bool JS::ObjectOpResult::failNoNamedSetter() {
return fail(JSMSG_NO_NAMED_SETTER);
}
JS_PUBLIC_API bool JS::ObjectOpResult::failNoIndexedSetter() {
return fail(JSMSG_NO_INDEXED_SETTER);
}
JS_PUBLIC_API bool JS::ObjectOpResult::failNotDataDescriptor() {
return fail(JSMSG_NOT_DATA_DESCRIPTOR);
}
JS_PUBLIC_API bool JS::ObjectOpResult::failInvalidDescriptor() {
return fail(JSMSG_INVALID_DESCRIPTOR);
}
JS_PUBLIC_API bool JS::ObjectOpResult::failBadArrayLength() {
return fail(JSMSG_BAD_ARRAY_LENGTH);
}
JS_PUBLIC_API bool JS::ObjectOpResult::failBadIndex() {
return fail(JSMSG_BAD_INDEX);
}
JS_PUBLIC_API int64_t JS_Now() { return PRMJ_Now(); }
JS_PUBLIC_API Value JS_GetEmptyStringValue(JSContext* cx) {
return StringValue(cx->runtime()->emptyString);
}
JS_PUBLIC_API JSString* JS_GetEmptyString(JSContext* cx) {
MOZ_ASSERT(cx->emptyString());
return cx->emptyString();
}
namespace js {
void AssertHeapIsIdle() { MOZ_ASSERT(!JS::RuntimeHeapIsBusy()); }
} // namespace js
static void AssertHeapIsIdleOrIterating() {
MOZ_ASSERT(!JS::RuntimeHeapIsCollecting());
}
JS_PUBLIC_API bool JS_ValueToObject(JSContext* cx, HandleValue value,
MutableHandleObject objp) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(value);
if (value.isNullOrUndefined()) {
objp.set(nullptr);
return true;
}
JSObject* obj = ToObject(cx, value);
if (!obj) {
return false;
}
objp.set(obj);
return true;
}
JS_PUBLIC_API JSFunction* JS_ValueToFunction(JSContext* cx, HandleValue value) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(value);
return ReportIfNotFunction(cx, value);
}
JS_PUBLIC_API JSFunction* JS_ValueToConstructor(JSContext* cx,
HandleValue value) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(value);
return ReportIfNotFunction(cx, value);
}
JS_PUBLIC_API JSString* JS_ValueToSource(JSContext* cx, HandleValue value) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(value);
return ValueToSource(cx, value);
}
JS_PUBLIC_API bool JS_DoubleIsInt32(double d, int32_t* ip) {
return mozilla::NumberIsInt32(d, ip);
}
JS_PUBLIC_API JSType JS_TypeOfValue(JSContext* cx, HandleValue value) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(value);
return TypeOfValue(value);
}
JS_PUBLIC_API bool JS_IsBuiltinEvalFunction(JSFunction* fun) {
return IsAnyBuiltinEval(fun);
}
JS_PUBLIC_API bool JS_IsBuiltinFunctionConstructor(JSFunction* fun) {
return fun->isBuiltinFunctionConstructor();
}
JS_PUBLIC_API bool JS_ObjectIsBoundFunction(JSObject* obj) {
return obj->is<BoundFunctionObject>();
}
JS_PUBLIC_API JSObject* JS_GetBoundFunctionTarget(JSObject* obj) {
return obj->is<BoundFunctionObject>()
? obj->as<BoundFunctionObject>().getTarget()
: nullptr;
}
/************************************************************************/
// Prevent functions from being discarded by linker, so that they are callable
// when debugging.
static void PreventDiscardingFunctions() {
if (reinterpret_cast<uintptr_t>(&PreventDiscardingFunctions) == 1) {
// Never executed.
memset((void*)&js::debug::GetMarkInfo, 0, 1);
memset((void*)&js::debug::GetMarkWordAddress, 0, 1);
memset((void*)&js::debug::GetMarkMask, 0, 1);
}
}
JS_PUBLIC_API JSContext* JS_NewContext(uint32_t maxbytes,
JSRuntime* parentRuntime) {
MOZ_ASSERT(JS::detail::libraryInitState == JS::detail::InitState::Running,
"must call JS_Init prior to creating any JSContexts");
// Prevent linker from discarding unused debug functions.
PreventDiscardingFunctions();
// Make sure that all parent runtimes are the topmost parent.
while (parentRuntime && parentRuntime->parentRuntime) {
parentRuntime = parentRuntime->parentRuntime;
}
return NewContext(maxbytes, parentRuntime);
}
JS_PUBLIC_API void JS_DestroyContext(JSContext* cx) { DestroyContext(cx); }
JS_PUBLIC_API void* JS_GetContextPrivate(JSContext* cx) { return cx->data; }
JS_PUBLIC_API void JS_SetContextPrivate(JSContext* cx, void* data) {
cx->data = data;
}
JS_PUBLIC_API void JS_SetFutexCanWait(JSContext* cx) {
cx->fx.setCanWait(true);
}
JS_PUBLIC_API JSRuntime* JS_GetParentRuntime(JSContext* cx) {
return cx->runtime()->parentRuntime ? cx->runtime()->parentRuntime
: cx->runtime();
}
JS_PUBLIC_API JSRuntime* JS_GetRuntime(JSContext* cx) { return cx->runtime(); }
JS_PUBLIC_API JS::ContextOptions& JS::ContextOptionsRef(JSContext* cx) {
return cx->options();
}
JS::ContextOptions& JS::ContextOptions::setFuzzing(bool flag) {
#ifdef FUZZING
fuzzing_ = flag;
#endif
return *this;
}
JS_PUBLIC_API const char* JS_GetImplementationVersion(void) {
return "JavaScript-C" MOZILLA_VERSION;
}
JS_PUBLIC_API void JS_SetDestroyZoneCallback(JSContext* cx,
JSDestroyZoneCallback callback) {
cx->runtime()->destroyZoneCallback = callback;
}
JS_PUBLIC_API void JS_SetDestroyCompartmentCallback(
JSContext* cx, JSDestroyCompartmentCallback callback) {
cx->runtime()->destroyCompartmentCallback = callback;
}
JS_PUBLIC_API void JS_SetSizeOfIncludingThisCompartmentCallback(
JSContext* cx, JSSizeOfIncludingThisCompartmentCallback callback) {
cx->runtime()->sizeOfIncludingThisCompartmentCallback = callback;
}
JS_PUBLIC_API void JS_SetErrorInterceptorCallback(
JSRuntime* rt, JSErrorInterceptor* callback) {
#if defined(NIGHTLY_BUILD)
rt->errorInterception.interceptor = callback;
#endif // defined(NIGHTLY_BUILD)
}
JS_PUBLIC_API JSErrorInterceptor* JS_GetErrorInterceptorCallback(
JSRuntime* rt) {
#if defined(NIGHTLY_BUILD)
return rt->errorInterception.interceptor;
#else // !NIGHTLY_BUILD
return nullptr;
#endif // defined(NIGHTLY_BUILD)
}
JS_PUBLIC_API Maybe<JSExnType> JS_GetErrorType(const JS::Value& val) {
// All errors are objects.
if (!val.isObject()) {
return mozilla::Nothing();
}
const JSObject& obj = val.toObject();
// All errors are `ErrorObject`.
if (!obj.is<js::ErrorObject>()) {
// Not one of the primitive errors.
return mozilla::Nothing();
}
const js::ErrorObject& err = obj.as<js::ErrorObject>();
return mozilla::Some(err.type());
}
JS_PUBLIC_API void JS_SetWrapObjectCallbacks(
JSContext* cx, const JSWrapObjectCallbacks* callbacks) {
cx->runtime()->wrapObjectCallbacks = callbacks;
}
JS_PUBLIC_API Realm* JS::EnterRealm(JSContext* cx, JSObject* target) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
MOZ_DIAGNOSTIC_ASSERT(!js::IsCrossCompartmentWrapper(target));
Realm* oldRealm = cx->realm();
cx->enterRealmOf(target);
return oldRealm;
}
JS_PUBLIC_API void JS::LeaveRealm(JSContext* cx, JS::Realm* oldRealm) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->leaveRealm(oldRealm);
}
JSAutoRealm::JSAutoRealm(JSContext* cx, JSObject* target)
: cx_(cx), oldRealm_(cx->realm()) {
MOZ_DIAGNOSTIC_ASSERT(!js::IsCrossCompartmentWrapper(target));
AssertHeapIsIdleOrIterating();
cx_->enterRealmOf(target);
}
JSAutoRealm::JSAutoRealm(JSContext* cx, JSScript* target)
: cx_(cx), oldRealm_(cx->realm()) {
AssertHeapIsIdleOrIterating();
cx_->enterRealmOf(target);
}
JSAutoRealm::~JSAutoRealm() { cx_->leaveRealm(oldRealm_); }
JSAutoNullableRealm::JSAutoNullableRealm(JSContext* cx, JSObject* targetOrNull)
: cx_(cx), oldRealm_(cx->realm()) {
AssertHeapIsIdleOrIterating();
if (targetOrNull) {
MOZ_DIAGNOSTIC_ASSERT(!js::IsCrossCompartmentWrapper(targetOrNull));
cx_->enterRealmOf(targetOrNull);
} else {
cx_->enterNullRealm();
}
}
JSAutoNullableRealm::~JSAutoNullableRealm() { cx_->leaveRealm(oldRealm_); }
JS_PUBLIC_API void JS_SetCompartmentPrivate(JS::Compartment* compartment,
void* data) {
compartment->data = data;
}
JS_PUBLIC_API void* JS_GetCompartmentPrivate(JS::Compartment* compartment) {
return compartment->data;
}
JS_PUBLIC_API void JS_MarkCrossZoneId(JSContext* cx, jsid id) {
cx->markId(id);
}
JS_PUBLIC_API void JS_MarkCrossZoneIdValue(JSContext* cx, const Value& value) {
cx->markAtomValue(value);
}
JS_PUBLIC_API void JS_SetZoneUserData(JS::Zone* zone, void* data) {
zone->data = data;
}
JS_PUBLIC_API void* JS_GetZoneUserData(JS::Zone* zone) { return zone->data; }
JS_PUBLIC_API bool JS_WrapObject(JSContext* cx, MutableHandleObject objp) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
if (objp) {
JS::ExposeObjectToActiveJS(objp);
}
return cx->compartment()->wrap(cx, objp);
}
JS_PUBLIC_API bool JS_WrapValue(JSContext* cx, MutableHandleValue vp) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
JS::ExposeValueToActiveJS(vp);
return cx->compartment()->wrap(cx, vp);
}
static void ReleaseAssertObjectHasNoWrappers(JSContext* cx,
HandleObject target) {
for (CompartmentsIter c(cx->runtime()); !c.done(); c.next()) {
if (c->lookupWrapper(target)) {
MOZ_CRASH("wrapper found for target object");
}
}
}
/*
* [SMDOC] Brain transplants.
*
* Not for beginners or the squeamish.
*
* Sometimes a web spec requires us to transplant an object from one
* compartment to another, like when a DOM node is inserted into a document in
* another window and thus gets "adopted". We cannot literally change the
* `.compartment()` of a `JSObject`; that would break the compartment
* invariants. However, as usual, we have a workaround using wrappers.
*
* Of all the wrapper-based workarounds we do, it's safe to say this is the
* most spectacular and questionable.
*
* `JS_TransplantObject(cx, origobj, target)` changes `origobj` into a
* simulacrum of `target`, using highly esoteric means. To JS code, the effect
* is as if `origobj` magically "became" `target`, but most often what actually
* happens is that `origobj` gets turned into a cross-compartment wrapper for
* `target`. The old behavior and contents of `origobj` are overwritten or
* discarded.
*
* Thus, to "transplant" an object from one compartment to another:
*
* 1. Let `origobj` be the object that you want to move. First, create a
* clone of it, `target`, in the destination compartment.
*
* In our DOM adoption example, `target` will be a Node of the same type as
* `origobj`, same content, but in the adopting document. We're not done
* yet: the spec for DOM adoption requires that `origobj.ownerDocument`
* actually change. All we've done so far is make a copy.
*
* 2. Call `JS_TransplantObject(cx, origobj, target)`. This typically turns
* `origobj` into a wrapper for `target`, so that any JS code that has a
* reference to `origobj` will observe it to have the behavior of `target`
* going forward. In addition, all existing wrappers for `origobj` are
* changed into wrappers for `target`, extending the illusion to those
* compartments as well.
*
* During navigation, we use the above technique to transplant the WindowProxy
* into the new Window's compartment.
*
* A few rules:
*
* - `origobj` and `target` must be two distinct objects of the same
* `JSClass`. Some classes may not support transplantation; WindowProxy
* objects and DOM nodes are OK.
*
* - `target` should be created specifically to be passed to this function.
* There must be no existing cross-compartment wrappers for it; ideally
* there shouldn't be any pointers to it at all, except the one passed in.
*
* - `target` shouldn't be used afterwards. Instead, `JS_TransplantObject`
* returns a pointer to the transplanted object, which might be `target`
* but might be some other object in the same compartment. Use that.
*
* The reason for this last rule is that JS_TransplantObject does very strange
* things in some cases, like swapping `target`'s brain with that of another
* object. Leaving `target` behaving like its former self is not a goal.
*
* We don't have a good way to recover from failure in this function, so
* we intentionally crash instead.
*/
static void CheckTransplantObject(JSObject* obj) {
#ifdef DEBUG
MOZ_ASSERT(!obj->is<CrossCompartmentWrapperObject>());
JS::AssertCellIsNotGray(obj);
#endif
}
JS_PUBLIC_API JSObject* JS_TransplantObject(JSContext* cx, HandleObject origobj,
HandleObject target) {
AssertHeapIsIdle();
MOZ_ASSERT(origobj != target);
CheckTransplantObject(origobj);
CheckTransplantObject(target);
ReleaseAssertObjectHasNoWrappers(cx, target);
RootedObject newIdentity(cx);
// Don't allow a compacting GC to observe any intermediate state.
AutoDisableCompactingGC nocgc(cx);
AutoDisableProxyCheck adpc;
AutoEnterOOMUnsafeRegion oomUnsafe;
JS::Compartment* destination = target->compartment();
if (origobj->compartment() == destination) {
// If the original object is in the same compartment as the
// destination, then we know that we won't find a wrapper in the
// destination's cross compartment map and that the same
// object will continue to work.
AutoRealm ar(cx, origobj);
JSObject::swap(cx, origobj, target, oomUnsafe);
newIdentity = origobj;
} else if (ObjectWrapperMap::Ptr p = destination->lookupWrapper(origobj)) {
// There might already be a wrapper for the original object in
// the new compartment. If there is, we use its identity and swap
// in the contents of |target|.
newIdentity = p->value().get();
// When we remove origv from the wrapper map, its wrapper, newIdentity,
// must immediately cease to be a cross-compartment wrapper. Nuke it.
destination->removeWrapper(p);
NukeCrossCompartmentWrapper(cx, newIdentity);
AutoRealm ar(cx, newIdentity);
JSObject::swap(cx, newIdentity, target, oomUnsafe);
} else {
// Otherwise, we use |target| for the new identity object.
newIdentity = target;
}
// Now, iterate through other scopes looking for references to the old
// object, and update the relevant cross-compartment wrappers. We do this
// even if origobj is in the same compartment as target and thus
// `newIdentity == origobj`, because this process also clears out any
// cached wrapper state.
if (!RemapAllWrappersForObject(cx, origobj, newIdentity)) {
oomUnsafe.crash("JS_TransplantObject");
}
// Lastly, update the original object to point to the new one.
if (origobj->compartment() != destination) {
RootedObject newIdentityWrapper(cx, newIdentity);
AutoRealm ar(cx, origobj);
if (!JS_WrapObject(cx, &newIdentityWrapper)) {
MOZ_RELEASE_ASSERT(cx->isThrowingOutOfMemory() ||
cx->isThrowingOverRecursed());
oomUnsafe.crash("JS_TransplantObject");
}
MOZ_ASSERT(Wrapper::wrappedObject(newIdentityWrapper) == newIdentity);
JSObject::swap(cx, origobj, newIdentityWrapper, oomUnsafe);
if (origobj->compartment()->lookupWrapper(newIdentity)) {
MOZ_ASSERT(origobj->is<CrossCompartmentWrapperObject>());
if (!origobj->compartment()->putWrapper(cx, newIdentity, origobj)) {
oomUnsafe.crash("JS_TransplantObject");
}
}
}
// The new identity object might be one of several things. Return it to avoid
// ambiguity.
JS::AssertCellIsNotGray(newIdentity);
return newIdentity;
}
JS_PUBLIC_API void js::RemapRemoteWindowProxies(
JSContext* cx, CompartmentTransplantCallback* callback,
MutableHandleObject target) {
AssertHeapIsIdle();
CheckTransplantObject(target);
ReleaseAssertObjectHasNoWrappers(cx, target);
// |target| can't be a remote proxy, because we expect it to get a CCW when
// wrapped across compartments.
MOZ_ASSERT(!js::IsDOMRemoteProxyObject(target));
// Don't allow a compacting GC to observe any intermediate state.
AutoDisableCompactingGC nocgc(cx);
AutoDisableProxyCheck adpc;
AutoEnterOOMUnsafeRegion oomUnsafe;
AutoCheckRecursionLimit recursion(cx);
if (!recursion.checkSystem(cx)) {
oomUnsafe.crash("js::RemapRemoteWindowProxies");
}
RootedObject targetCompartmentProxy(cx);
JS::RootedVector<JSObject*> otherProxies(cx);
// Use the callback to find remote proxies in all compartments that match
// whatever criteria callback uses.
for (CompartmentsIter c(cx->runtime()); !c.done(); c.next()) {
RootedObject remoteProxy(cx, callback->getObjectToTransplant(c));
if (!remoteProxy) {
continue;
}
// The object the callback returns should be a DOM remote proxy object in
// the compartment c. We rely on it being a DOM remote proxy because that
// means that it won't have any cross-compartment wrappers.
MOZ_ASSERT(js::IsDOMRemoteProxyObject(remoteProxy));
MOZ_ASSERT(remoteProxy->compartment() == c);
CheckTransplantObject(remoteProxy);
// Immediately turn the DOM remote proxy object into a dead proxy object
// so we don't have to worry about anything weird going on with it.
js::NukeNonCCWProxy(cx, remoteProxy);
if (remoteProxy->compartment() == target->compartment()) {
targetCompartmentProxy = remoteProxy;
} else if (!otherProxies.append(remoteProxy)) {
oomUnsafe.crash("js::RemapRemoteWindowProxies");
}
}
// If there was a remote proxy in |target|'s compartment, we need to use it
// instead of |target|, in case it had any references, so swap it. Do this
// before any other compartment so that the target object will be set up
// correctly before we start wrapping it into other compartments.
if (targetCompartmentProxy) {
AutoRealm ar(cx, targetCompartmentProxy);
JSObject::swap(cx, targetCompartmentProxy, target, oomUnsafe);
target.set(targetCompartmentProxy);
}
for (JSObject*& obj : otherProxies) {
RootedObject deadWrapper(cx, obj);
js::RemapDeadWrapper(cx, deadWrapper, target);
}
}
/*
* Recompute all cross-compartment wrappers for an object, resetting state.
* Gecko uses this to clear Xray wrappers when doing a navigation that reuses
* the inner window and global object.
*/
JS_PUBLIC_API bool JS_RefreshCrossCompartmentWrappers(JSContext* cx,
HandleObject obj) {
return RemapAllWrappersForObject(cx, obj, obj);
}
typedef struct JSStdName {
size_t atomOffset; /* offset of atom pointer in JSAtomState */
JSProtoKey key;
bool isDummy() const { return key == JSProto_Null; }
bool isSentinel() const { return key == JSProto_LIMIT; }
} JSStdName;
static const JSStdName* LookupStdName(const JSAtomState& names, JSAtom* name,
const JSStdName* table) {
for (unsigned i = 0; !table[i].isSentinel(); i++) {
if (table[i].isDummy()) {
continue;
}
JSAtom* atom = AtomStateOffsetToName(names, table[i].atomOffset);
MOZ_ASSERT(atom);
if (name == atom) {
return &table[i];
}
}
return nullptr;
}
/*
* Table of standard classes, indexed by JSProtoKey. For entries where the
* JSProtoKey does not correspond to a class with a meaningful constructor, we
* insert a null entry into the table.
*/
#define STD_NAME_ENTRY(name, clasp) {NAME_OFFSET(name), JSProto_##name},
#define STD_DUMMY_ENTRY(name, dummy) {0, JSProto_Null},
static const JSStdName standard_class_names[] = {
JS_FOR_PROTOTYPES(STD_NAME_ENTRY, STD_DUMMY_ENTRY){0, JSProto_LIMIT}};
/*
* Table of top-level function and constant names and the JSProtoKey of the
* standard class that initializes them.
*/
static const JSStdName builtin_property_names[] = {
{NAME_OFFSET(eval), JSProto_Object},
/* Global properties and functions defined by the Number class. */
{NAME_OFFSET(NaN), JSProto_Number},
{NAME_OFFSET(Infinity), JSProto_Number},
{NAME_OFFSET(isNaN), JSProto_Number},
{NAME_OFFSET(isFinite), JSProto_Number},
{NAME_OFFSET(parseFloat), JSProto_Number},
{NAME_OFFSET(parseInt), JSProto_Number},
/* String global functions. */
{NAME_OFFSET(escape), JSProto_String},
{NAME_OFFSET(unescape), JSProto_String},
{NAME_OFFSET(decodeURI), JSProto_String},
{NAME_OFFSET(encodeURI), JSProto_String},
{NAME_OFFSET(decodeURIComponent), JSProto_String},
{NAME_OFFSET(encodeURIComponent), JSProto_String},
{NAME_OFFSET(uneval), JSProto_String},
{0, JSProto_LIMIT}};
static bool SkipUneval(jsid id, JSContext* cx) {
return !cx->realm()->creationOptions().getToSourceEnabled() &&
id == NameToId(cx->names().uneval);
}
static bool SkipSharedArrayBufferConstructor(JSProtoKey key,
GlobalObject* global) {
if (key != JSProto_SharedArrayBuffer) {
return false;
}
const JS::RealmCreationOptions& options = global->realm()->creationOptions();
MOZ_ASSERT(options.getSharedMemoryAndAtomicsEnabled(),
"shouldn't contemplate defining SharedArrayBuffer if shared "
"memory is disabled");
// On the web, it isn't presently possible to expose the global
// "SharedArrayBuffer" property unless the page is cross-site-isolated. Only
// define this constructor if an option on the realm indicates that it should
// be defined.
return !options.defineSharedArrayBufferConstructor();
}
JS_PUBLIC_API bool JS_ResolveStandardClass(JSContext* cx, HandleObject obj,
HandleId id, bool* resolved) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(obj, id);
Handle<GlobalObject*> global = obj.as<GlobalObject>();
*resolved = false;
if (!id.isAtom()) {
return true;
}
/* Check whether we're resolving 'undefined', and define it if so. */
JSAtom* idAtom = id.toAtom();
if (idAtom == cx->names().undefined) {
*resolved = true;
return js::DefineDataProperty(
cx, global, id, UndefinedHandleValue,
JSPROP_PERMANENT | JSPROP_READONLY | JSPROP_RESOLVING);
}
// Resolve a "globalThis" self-referential property if necessary.
if (idAtom == cx->names().globalThis) {
return GlobalObject::maybeResolveGlobalThis(cx, global, resolved);
}
// Try for class constructors/prototypes named by well-known atoms.
const JSStdName* stdnm =
LookupStdName(cx->names(), idAtom, standard_class_names);
if (!stdnm) {
// Try less frequently used top-level functions and constants.
stdnm = LookupStdName(cx->names(), idAtom, builtin_property_names);
if (!stdnm) {
return true;
}
}
JSProtoKey key = stdnm->key;
if (key == JSProto_Null || GlobalObject::skipDeselectedConstructor(cx, key) ||
SkipUneval(id, cx)) {
return true;
}
// If this class is anonymous (or it's "SharedArrayBuffer" but that global
// constructor isn't supposed to be defined), then it doesn't exist as a
// global property, so we won't resolve anything.
const JSClass* clasp = ProtoKeyToClass(key);
if (clasp && !clasp->specShouldDefineConstructor()) {
return true;
}
if (SkipSharedArrayBufferConstructor(key, global)) {
return true;
}
if (!GlobalObject::ensureConstructor(cx, global, key)) {
return false;
}
*resolved = true;
return true;
}
JS_PUBLIC_API bool JS_MayResolveStandardClass(const JSAtomState& names, jsid id,
JSObject* maybeObj) {
MOZ_ASSERT_IF(maybeObj, maybeObj->is<GlobalObject>());
// The global object's resolve hook is special: JS_ResolveStandardClass
// initializes the prototype chain lazily. Only attempt to optimize here
// if we know the prototype chain has been initialized.
if (!maybeObj || !maybeObj->staticPrototype()) {
return true;
}
if (!id.isAtom()) {
return false;
}
JSAtom* atom = id.toAtom();
// This will return true even for deselected constructors. (To do
// better, we need a JSContext here; it's fine as it is.)
return atom == names.undefined || atom == names.globalThis ||
LookupStdName(names, atom, standard_class_names) ||
LookupStdName(names, atom, builtin_property_names);
}
JS_PUBLIC_API bool JS_EnumerateStandardClasses(JSContext* cx,
HandleObject obj) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(obj);
Handle<GlobalObject*> global = obj.as<GlobalObject>();
return GlobalObject::initStandardClasses(cx, global);
}
static bool EnumerateStandardClassesInTable(JSContext* cx,
Handle<GlobalObject*> global,
MutableHandleIdVector properties,
const JSStdName* table,
bool includeResolved) {
for (unsigned i = 0; !table[i].isSentinel(); i++) {
if (table[i].isDummy()) {
continue;
}
JSProtoKey key = table[i].key;
// If the standard class has been resolved, the properties have been
// defined on the global so we don't need to add them here.
if (!includeResolved && global->isStandardClassResolved(key)) {
continue;
}
if (GlobalObject::skipDeselectedConstructor(cx, key)) {
continue;
}
if (const JSClass* clasp = ProtoKeyToClass(key)) {
if (!clasp->specShouldDefineConstructor() ||
SkipSharedArrayBufferConstructor(key, global)) {
continue;
}
}
jsid id = NameToId(AtomStateOffsetToName(cx->names(), table[i].atomOffset));
if (SkipUneval(id, cx)) {
continue;
}
if (!properties.append(id)) {
return false;
}
}
return true;
}
static bool EnumerateStandardClasses(JSContext* cx, JS::HandleObject obj,
JS::MutableHandleIdVector properties,
bool enumerableOnly,
bool includeResolved) {
if (enumerableOnly) {
// There are no enumerable standard classes and "undefined" is
// not enumerable.
return true;
}
Handle<GlobalObject*> global = obj.as<GlobalObject>();
// It's fine to always append |undefined| here, it's non-configurable and
// the enumeration code filters duplicates.
if (!properties.append(NameToId(cx->names().undefined))) {
return false;
}
bool resolved = false;
if (!GlobalObject::maybeResolveGlobalThis(cx, global, &resolved)) {
return false;
}
if (resolved || includeResolved) {
if (!properties.append(NameToId(cx->names().globalThis))) {
return false;
}
}
if (!EnumerateStandardClassesInTable(cx, global, properties,
standard_class_names, includeResolved)) {
return false;
}
if (!EnumerateStandardClassesInTable(
cx, global, properties, builtin_property_names, includeResolved)) {
return false;
}
return true;
}
JS_PUBLIC_API bool JS_NewEnumerateStandardClasses(
JSContext* cx, JS::HandleObject obj, JS::MutableHandleIdVector properties,
bool enumerableOnly) {
return EnumerateStandardClasses(cx, obj, properties, enumerableOnly, false);
}
JS_PUBLIC_API bool JS_NewEnumerateStandardClassesIncludingResolved(
JSContext* cx, JS::HandleObject obj, JS::MutableHandleIdVector properties,
bool enumerableOnly) {
return EnumerateStandardClasses(cx, obj, properties, enumerableOnly, true);
}
JS_PUBLIC_API bool JS_GetClassObject(JSContext* cx, JSProtoKey key,
MutableHandleObject objp) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
JSObject* obj = GlobalObject::getOrCreateConstructor(cx, key);
if (!obj) {
return false;
}
objp.set(obj);
return true;
}
JS_PUBLIC_API bool JS_GetClassPrototype(JSContext* cx, JSProtoKey key,
MutableHandleObject objp) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
// Bound functions don't have their own prototype object: they reuse the
// prototype of the target object. This is typically Function.prototype so we
// use that here.
if (key == JSProto_BoundFunction) {
key = JSProto_Function;
}
JSObject* proto = GlobalObject::getOrCreatePrototype(cx, key);
if (!proto) {
return false;
}
objp.set(proto);
return true;
}
namespace JS {
JS_PUBLIC_API void ProtoKeyToId(JSContext* cx, JSProtoKey key,
MutableHandleId idp) {
idp.set(NameToId(ClassName(key, cx)));
}
} /* namespace JS */
JS_PUBLIC_API JSProtoKey JS_IdToProtoKey(JSContext* cx, HandleId id) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(id);
if (!id.isAtom()) {
return JSProto_Null;
}
JSAtom* atom = id.toAtom();
const JSStdName* stdnm =
LookupStdName(cx->names(), atom, standard_class_names);
if (!stdnm) {
return JSProto_Null;
}
if (GlobalObject::skipDeselectedConstructor(cx, stdnm->key)) {
return JSProto_Null;
}
if (SkipSharedArrayBufferConstructor(stdnm->key, cx->global())) {
MOZ_ASSERT(id == NameToId(cx->names().SharedArrayBuffer));
return JSProto_Null;
}
if (SkipUneval(id, cx)) {
return JSProto_Null;
}
static_assert(std::size(standard_class_names) == JSProto_LIMIT + 1);
return static_cast<JSProtoKey>(stdnm - standard_class_names);
}
extern JS_PUBLIC_API bool JS_IsGlobalObject(JSObject* obj) {
return obj->is<GlobalObject>();
}
extern JS_PUBLIC_API JSObject* JS_GlobalLexicalEnvironment(JSObject* obj) {
return &obj->as<GlobalObject>().lexicalEnvironment();
}
extern JS_PUBLIC_API bool JS_HasExtensibleLexicalEnvironment(JSObject* obj) {
return obj->is<GlobalObject>() ||
ObjectRealm::get(obj).getNonSyntacticLexicalEnvironment(obj);
}
extern JS_PUBLIC_API JSObject* JS_ExtensibleLexicalEnvironment(JSObject* obj) {
return ExtensibleLexicalEnvironmentObject::forVarEnvironment(obj);
}
JS_PUBLIC_API JSObject* JS::CurrentGlobalOrNull(JSContext* cx) {
AssertHeapIsIdleOrIterating();
CHECK_THREAD(cx);
if (!cx->realm()) {
return nullptr;
}
return cx->global();
}
JS_PUBLIC_API JSObject* JS::GetNonCCWObjectGlobal(JSObject* obj) {
AssertHeapIsIdleOrIterating();
MOZ_DIAGNOSTIC_ASSERT(!IsCrossCompartmentWrapper(obj));
return &obj->nonCCWGlobal();
}
JS_PUBLIC_API bool JS::detail::ComputeThis(JSContext* cx, Value* vp,
MutableHandleObject thisObject) {
AssertHeapIsIdle();
cx->check(vp[0], vp[1]);
MutableHandleValue thisv = MutableHandleValue::fromMarkedLocation(&vp[1]);
JSObject* obj = BoxNonStrictThis(cx, thisv);
if (!obj) {
return false;
}
thisObject.set(obj);
return true;
}
static bool gProfileTimelineRecordingEnabled = false;
JS_PUBLIC_API void JS::SetProfileTimelineRecordingEnabled(bool enabled) {
gProfileTimelineRecordingEnabled = enabled;
}
JS_PUBLIC_API bool JS::IsProfileTimelineRecordingEnabled() {
return gProfileTimelineRecordingEnabled;
}
JS_PUBLIC_API void* JS_malloc(JSContext* cx, size_t nbytes) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
return static_cast<void*>(cx->maybe_pod_malloc<uint8_t>(nbytes));
}
JS_PUBLIC_API void* JS_realloc(JSContext* cx, void* p, size_t oldBytes,
size_t newBytes) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
return static_cast<void*>(cx->maybe_pod_realloc<uint8_t>(
static_cast<uint8_t*>(p), oldBytes, newBytes));
}
JS_PUBLIC_API void JS_free(JSContext* cx, void* p) { return js_free(p); }
JS_PUBLIC_API void* JS_string_malloc(JSContext* cx, size_t nbytes) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
return static_cast<void*>(
cx->maybe_pod_arena_malloc<uint8_t>(js::StringBufferArena, nbytes));
}
JS_PUBLIC_API void* JS_string_realloc(JSContext* cx, void* p, size_t oldBytes,
size_t newBytes) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
return static_cast<void*>(cx->maybe_pod_arena_realloc<uint8_t>(
js::StringBufferArena, static_cast<uint8_t*>(p), oldBytes, newBytes));
}
JS_PUBLIC_API void JS_string_free(JSContext* cx, void* p) { return js_free(p); }
JS_PUBLIC_API void JS::AddAssociatedMemory(JSObject* obj, size_t nbytes,
JS::MemoryUse use) {
MOZ_ASSERT(obj);
if (!nbytes) {
return;
}
Zone* zone = obj->zone();
MOZ_ASSERT(!IsInsideNursery(obj));
zone->addCellMemory(obj, nbytes, js::MemoryUse(use));
zone->maybeTriggerGCOnMalloc();
}
JS_PUBLIC_API void JS::RemoveAssociatedMemory(JSObject* obj, size_t nbytes,
JS::MemoryUse use) {
MOZ_ASSERT(obj);
if (!nbytes) {
return;
}
GCContext* gcx = obj->runtimeFromMainThread()->gcContext();
gcx->removeCellMemory(obj, nbytes, js::MemoryUse(use));
}
#undef JS_AddRoot
JS_PUBLIC_API bool JS_AddExtraGCRootsTracer(JSContext* cx,
JSTraceDataOp traceOp, void* data) {
return cx->runtime()->gc.addBlackRootsTracer(traceOp, data);
}
JS_PUBLIC_API void JS_RemoveExtraGCRootsTracer(JSContext* cx,
JSTraceDataOp traceOp,
void* data) {
return cx->runtime()->gc.removeBlackRootsTracer(traceOp, data);
}
JS_PUBLIC_API JS::GCReason JS::WantEagerMinorGC(JSRuntime* rt) {
if (rt->gc.nursery().shouldCollect()) {
return JS::GCReason::EAGER_NURSERY_COLLECTION;
}
return JS::GCReason::NO_REASON;
}
JS_PUBLIC_API JS::GCReason JS::WantEagerMajorGC(JSRuntime* rt) {
return rt->gc.wantMajorGC(true);
}
JS_PUBLIC_API void JS::MaybeRunNurseryCollection(JSRuntime* rt,
JS::GCReason reason) {
gc::GCRuntime& gc = rt->gc;
if (gc.nursery().shouldCollect()) {
gc.minorGC(reason);
}
}
JS_PUBLIC_API void JS_GC(JSContext* cx, JS::GCReason reason) {
AssertHeapIsIdle();
JS::PrepareForFullGC(cx);
cx->runtime()->gc.gc(JS::GCOptions::Normal, reason);
}
JS_PUBLIC_API void JS_MaybeGC(JSContext* cx) {
AssertHeapIsIdle();
cx->runtime()->gc.maybeGC();
}
JS_PUBLIC_API void JS_SetGCCallback(JSContext* cx, JSGCCallback cb,
void* data) {
AssertHeapIsIdle();
cx->runtime()->gc.setGCCallback(cb, data);
}
JS_PUBLIC_API void JS_SetObjectsTenuredCallback(JSContext* cx,
JSObjectsTenuredCallback cb,
void* data) {
AssertHeapIsIdle();
cx->runtime()->gc.setObjectsTenuredCallback(cb, data);
}
JS_PUBLIC_API bool JS_AddFinalizeCallback(JSContext* cx, JSFinalizeCallback cb,
void* data) {
AssertHeapIsIdle();
return cx->runtime()->gc.addFinalizeCallback(cb, data);
}
JS_PUBLIC_API void JS_RemoveFinalizeCallback(JSContext* cx,
JSFinalizeCallback cb) {
cx->runtime()->gc.removeFinalizeCallback(cb);
}
JS_PUBLIC_API void JS::SetHostCleanupFinalizationRegistryCallback(
JSContext* cx, JSHostCleanupFinalizationRegistryCallback cb, void* data) {
AssertHeapIsIdle();
cx->runtime()->gc.setHostCleanupFinalizationRegistryCallback(cb, data);
}
JS_PUBLIC_API void JS::ClearKeptObjects(JSContext* cx) {
gc::GCRuntime* gc = &cx->runtime()->gc;
for (ZonesIter zone(gc, ZoneSelector::WithAtoms); !zone.done(); zone.next()) {
zone->clearKeptObjects();
}
}
JS_PUBLIC_API bool JS::AtomsZoneIsCollecting(JSRuntime* runtime) {
return runtime->activeGCInAtomsZone();
}
JS_PUBLIC_API bool JS::IsAtomsZone(JS::Zone* zone) {
return zone->isAtomsZone();
}
JS_PUBLIC_API bool JS_AddWeakPointerZonesCallback(JSContext* cx,
JSWeakPointerZonesCallback cb,
void* data) {
AssertHeapIsIdle();
return cx->runtime()->gc.addWeakPointerZonesCallback(cb, data);
}
JS_PUBLIC_API void JS_RemoveWeakPointerZonesCallback(
JSContext* cx, JSWeakPointerZonesCallback cb) {
cx->runtime()->gc.removeWeakPointerZonesCallback(cb);
}
JS_PUBLIC_API bool JS_AddWeakPointerCompartmentCallback(
JSContext* cx, JSWeakPointerCompartmentCallback cb, void* data) {
AssertHeapIsIdle();
return cx->runtime()->gc.addWeakPointerCompartmentCallback(cb, data);
}
JS_PUBLIC_API void JS_RemoveWeakPointerCompartmentCallback(
JSContext* cx, JSWeakPointerCompartmentCallback cb) {
cx->runtime()->gc.removeWeakPointerCompartmentCallback(cb);
}
JS_PUBLIC_API bool JS_UpdateWeakPointerAfterGC(JSTracer* trc,
JS::Heap<JSObject*>* objp) {
return TraceWeakEdge(trc, objp);
}
JS_PUBLIC_API bool JS_UpdateWeakPointerAfterGCUnbarriered(JSTracer* trc,
JSObject** objp) {
return TraceManuallyBarrieredWeakEdge(trc, objp, "External weak pointer");
}
JS_PUBLIC_API void JS_SetGCParameter(JSContext* cx, JSGCParamKey key,
uint32_t value) {
MOZ_ALWAYS_TRUE(cx->runtime()->gc.setParameter(cx, key, value));
}
JS_PUBLIC_API void JS_ResetGCParameter(JSContext* cx, JSGCParamKey key) {
cx->runtime()->gc.resetParameter(cx, key);
}
JS_PUBLIC_API uint32_t JS_GetGCParameter(JSContext* cx, JSGCParamKey key) {
return cx->runtime()->gc.getParameter(key);
}
JS_PUBLIC_API void JS_SetGCParametersBasedOnAvailableMemory(
JSContext* cx, uint32_t availMemMB) {
struct JSGCConfig {
JSGCParamKey key;
uint32_t value;
};
static const JSGCConfig minimal[] = {
{JSGC_SLICE_TIME_BUDGET_MS, 5},
{JSGC_HIGH_FREQUENCY_TIME_LIMIT, 1500},
{JSGC_LARGE_HEAP_SIZE_MIN, 250},
{JSGC_SMALL_HEAP_SIZE_MAX, 50},
{JSGC_HIGH_FREQUENCY_SMALL_HEAP_GROWTH, 300},
{JSGC_HIGH_FREQUENCY_LARGE_HEAP_GROWTH, 120},
{JSGC_LOW_FREQUENCY_HEAP_GROWTH, 120},
{JSGC_ALLOCATION_THRESHOLD, 15},
{JSGC_MALLOC_THRESHOLD_BASE, 20},
{JSGC_SMALL_HEAP_INCREMENTAL_LIMIT, 200},
{JSGC_LARGE_HEAP_INCREMENTAL_LIMIT, 110},
{JSGC_URGENT_THRESHOLD_MB, 8}};
static const JSGCConfig nominal[] = {
{JSGC_SLICE_TIME_BUDGET_MS, 5},
{JSGC_HIGH_FREQUENCY_TIME_LIMIT, 1000},
{JSGC_LARGE_HEAP_SIZE_MIN, 500},
{JSGC_SMALL_HEAP_SIZE_MAX, 100},
{JSGC_HIGH_FREQUENCY_SMALL_HEAP_GROWTH, 300},
{JSGC_HIGH_FREQUENCY_LARGE_HEAP_GROWTH, 150},
{JSGC_LOW_FREQUENCY_HEAP_GROWTH, 150},
{JSGC_ALLOCATION_THRESHOLD, 27},
{JSGC_MALLOC_THRESHOLD_BASE, 38},
{JSGC_SMALL_HEAP_INCREMENTAL_LIMIT, 150},
{JSGC_LARGE_HEAP_INCREMENTAL_LIMIT, 110},
{JSGC_URGENT_THRESHOLD_MB, 16}};
const auto& configSet = availMemMB > 512 ? nominal : minimal;
for (const auto& config : configSet) {
JS_SetGCParameter(cx, config.key, config.value);
}
}
JS_PUBLIC_API JSString* JS_NewExternalString(
JSContext* cx, const char16_t* chars, size_t length,
const JSExternalStringCallbacks* callbacks) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
return JSExternalString::new_(cx, chars, length, callbacks);
}
JS_PUBLIC_API JSString* JS_NewMaybeExternalString(
JSContext* cx, const char16_t* chars, size_t length,
const JSExternalStringCallbacks* callbacks, bool* allocatedExternal) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
return NewMaybeExternalString(cx, chars, length, callbacks,
allocatedExternal);
}
extern JS_PUBLIC_API const JSExternalStringCallbacks*
JS_GetExternalStringCallbacks(JSString* str) {
return str->asExternal().callbacks();
}
static void SetNativeStackSize(JSContext* cx, JS::StackKind kind,
JS::NativeStackSize stackSize) {
#ifdef __wasi__
cx->nativeStackLimit[kind] = JS::WASINativeStackLimit;
#else // __wasi__
if (stackSize == 0) {
cx->nativeStackLimit[kind] = JS::NativeStackLimitMax;
} else {
cx->nativeStackLimit[kind] =
JS::GetNativeStackLimit(cx->nativeStackBase(), stackSize - 1);
}
#endif // !__wasi__
}
JS_PUBLIC_API void JS_SetNativeStackQuota(
JSContext* cx, JS::NativeStackSize systemCodeStackSize,
JS::NativeStackSize trustedScriptStackSize,
JS::NativeStackSize untrustedScriptStackSize) {
MOZ_ASSERT(!cx->activation());
MOZ_ASSERT(cx->isMainThreadContext());
if (!trustedScriptStackSize) {
trustedScriptStackSize = systemCodeStackSize;
} else {
MOZ_ASSERT(trustedScriptStackSize < systemCodeStackSize);
}
if (!untrustedScriptStackSize) {
untrustedScriptStackSize = trustedScriptStackSize;
} else {
MOZ_ASSERT(untrustedScriptStackSize < trustedScriptStackSize);
}
SetNativeStackSize(cx, JS::StackForSystemCode, systemCodeStackSize);
SetNativeStackSize(cx, JS::StackForTrustedScript, trustedScriptStackSize);
SetNativeStackSize(cx, JS::StackForUntrustedScript, untrustedScriptStackSize);
cx->initJitStackLimit();
}
/************************************************************************/
JS_PUBLIC_API bool JS_ValueToId(JSContext* cx, HandleValue value,
MutableHandleId idp) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(value);
return ToPropertyKey(cx, value, idp);
}
JS_PUBLIC_API bool JS_StringToId(JSContext* cx, HandleString string,
MutableHandleId idp) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(string);
RootedValue value(cx, StringValue(string));
return PrimitiveValueToId<CanGC>(cx, value, idp);
}
JS_PUBLIC_API bool JS_IdToValue(JSContext* cx, jsid id, MutableHandleValue vp) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(id);
vp.set(IdToValue(id));
cx->check(vp);
return true;
}
JS_PUBLIC_API bool JS::ToPrimitive(JSContext* cx, HandleObject obj, JSType hint,
MutableHandleValue vp) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(obj);
MOZ_ASSERT(obj != nullptr);
MOZ_ASSERT(hint == JSTYPE_UNDEFINED || hint == JSTYPE_STRING ||
hint == JSTYPE_NUMBER);
vp.setObject(*obj);
return ToPrimitiveSlow(cx, hint, vp);
}
JS_PUBLIC_API bool JS::GetFirstArgumentAsTypeHint(JSContext* cx, CallArgs args,
JSType* result) {
if (!args.get(0).isString()) {
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
JSMSG_NOT_EXPECTED_TYPE, "Symbol.toPrimitive",
"\"string\", \"number\", or \"default\"",
InformalValueTypeName(args.get(0)));
return false;
}
RootedString str(cx, args.get(0).toString());
bool match;
if (!EqualStrings(cx, str, cx->names().default_, &match)) {
return false;
}
if (match) {
*result = JSTYPE_UNDEFINED;
return true;
}
if (!EqualStrings(cx, str, cx->names().string, &match)) {
return false;
}
if (match) {
*result = JSTYPE_STRING;
return true;
}
if (!EqualStrings(cx, str, cx->names().number, &match)) {
return false;
}
if (match) {
*result = JSTYPE_NUMBER;
return true;
}
UniqueChars bytes;
const char* source = ValueToSourceForError(cx, args.get(0), bytes);
if (!source) {
ReportOutOfMemory(cx);
return false;
}
JS_ReportErrorNumberUTF8(cx, GetErrorMessage, nullptr,
JSMSG_NOT_EXPECTED_TYPE, "Symbol.toPrimitive",
"\"string\", \"number\", or \"default\"", source);
return false;
}
JS_PUBLIC_API JSObject* JS_InitClass(
JSContext* cx, HandleObject obj, const JSClass* protoClass,
HandleObject protoProto, const char* name, JSNative constructor,
unsigned nargs, const JSPropertySpec* ps, const JSFunctionSpec* fs,
const JSPropertySpec* static_ps, const JSFunctionSpec* static_fs) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(obj, protoProto);
return InitClass(cx, obj, protoClass, protoProto, name, constructor, nargs,
ps, fs, static_ps, static_fs);
}
JS_PUBLIC_API bool JS_LinkConstructorAndPrototype(JSContext* cx,
HandleObject ctor,
HandleObject proto) {
return LinkConstructorAndPrototype(cx, ctor, proto);
}
JS_PUBLIC_API bool JS_InstanceOf(JSContext* cx, HandleObject obj,
const JSClass* clasp, CallArgs* args) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
#ifdef DEBUG
if (args) {
cx->check(obj);
cx->check(args->thisv(), args->calleev());
}
#endif
if (!obj || obj->getClass() != clasp) {
if (args) {
ReportIncompatibleMethod(cx, *args, clasp);
}
return false;
}
return true;
}
JS_PUBLIC_API bool JS_HasInstance(JSContext* cx, HandleObject obj,
HandleValue value, bool* bp) {
AssertHeapIsIdle();
cx->check(obj, value);
return InstanceofOperator(cx, obj, value, bp);
}
JS_PUBLIC_API JSObject* JS_GetConstructor(JSContext* cx, HandleObject proto) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(proto);
RootedValue cval(cx);
if (!GetProperty(cx, proto, proto, cx->names().constructor, &cval)) {
return nullptr;
}
if (!IsFunctionObject(cval)) {
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
JSMSG_NO_CONSTRUCTOR, proto->getClass()->name);
return nullptr;
}
return &cval.toObject();
}
JS::RealmCreationOptions&
JS::RealmCreationOptions::setNewCompartmentInSystemZone() {
compSpec_ = CompartmentSpecifier::NewCompartmentInSystemZone;
comp_ = nullptr;
return *this;
}
JS::RealmCreationOptions&
JS::RealmCreationOptions::setNewCompartmentInExistingZone(JSObject* obj) {
compSpec_ = CompartmentSpecifier::NewCompartmentInExistingZone;
zone_ = obj->zone();
return *this;
}
JS::RealmCreationOptions& JS::RealmCreationOptions::setExistingCompartment(
JSObject* obj) {
compSpec_ = CompartmentSpecifier::ExistingCompartment;
comp_ = obj->compartment();
return *this;
}
JS::RealmCreationOptions& JS::RealmCreationOptions::setExistingCompartment(
JS::Compartment* compartment) {
compSpec_ = CompartmentSpecifier::ExistingCompartment;
comp_ = compartment;
return *this;
}
JS::RealmCreationOptions& JS::RealmCreationOptions::setNewCompartmentAndZone() {
compSpec_ = CompartmentSpecifier::NewCompartmentAndZone;
comp_ = nullptr;
return *this;
}
const JS::RealmCreationOptions& JS::RealmCreationOptionsRef(Realm* realm) {
return realm->creationOptions();
}
const JS::RealmCreationOptions& JS::RealmCreationOptionsRef(JSContext* cx) {
return cx->realm()->creationOptions();
}
bool JS::RealmCreationOptions::getSharedMemoryAndAtomicsEnabled() const {
return sharedMemoryAndAtomics_;
}
JS::RealmCreationOptions&
JS::RealmCreationOptions::setSharedMemoryAndAtomicsEnabled(bool flag) {
sharedMemoryAndAtomics_ = flag;
return *this;
}
bool JS::RealmCreationOptions::getCoopAndCoepEnabled() const {
return coopAndCoep_;
}
JS::RealmCreationOptions& JS::RealmCreationOptions::setCoopAndCoepEnabled(
bool flag) {
coopAndCoep_ = flag;
return *this;
}
const JS::RealmBehaviors& JS::RealmBehaviorsRef(JS::Realm* realm) {
return realm->behaviors();
}
const JS::RealmBehaviors& JS::RealmBehaviorsRef(JSContext* cx) {
return cx->realm()->behaviors();
}
void JS::SetRealmNonLive(Realm* realm) { realm->setNonLive(); }
JS_PUBLIC_API JSObject* JS_NewGlobalObject(JSContext* cx, const JSClass* clasp,
JSPrincipals* principals,
JS::OnNewGlobalHookOption hookOption,
const JS::RealmOptions& options) {
MOZ_RELEASE_ASSERT(
cx->runtime()->hasInitializedSelfHosting(),
"Must call JS::InitSelfHostedCode() before creating a global");
AssertHeapIsIdle();
CHECK_THREAD(cx);
return GlobalObject::new_(cx, clasp, principals, hookOption, options);
}
JS_PUBLIC_API void JS_GlobalObjectTraceHook(JSTracer* trc, JSObject* global) {
GlobalObject* globalObj = &global->as<GlobalObject>();
Realm* globalRealm = globalObj->realm();
// If we GC when creating the global, we may not have set that global's
// realm's global pointer yet. In this case, the realm will not yet contain
// anything that needs to be traced.
if (globalRealm->unsafeUnbarrieredMaybeGlobal() != globalObj) {
return;
}
// Trace the realm for any GC things that should only stick around if we
// know the global is live.
globalRealm->traceGlobalData(trc);
globalObj->traceData(trc, globalObj);
if (JSTraceOp trace = globalRealm->creationOptions().getTrace()) {
trace(trc, global);
}
}
const JSClassOps JS::DefaultGlobalClassOps = {
nullptr, // addProperty
nullptr, // delProperty
nullptr, // enumerate
JS_NewEnumerateStandardClasses, // newEnumerate
JS_ResolveStandardClass, // resolve
JS_MayResolveStandardClass, // mayResolve
nullptr, // finalize
nullptr, // call
nullptr, // construct
JS_GlobalObjectTraceHook, // trace
};
JS_PUBLIC_API void JS_FireOnNewGlobalObject(JSContext* cx,
JS::HandleObject global) {
// This hook is infallible, because we don't really want arbitrary script
// to be able to throw errors during delicate global creation routines.
// This infallibility will eat OOM and slow script, but if that happens
// we'll likely run up into them again soon in a fallible context.
cx->check(global);
Rooted<js::GlobalObject*> globalObject(cx, &global->as<GlobalObject>());
DebugAPI::onNewGlobalObject(cx, globalObject);
cx->runtime()->ensureRealmIsRecordingAllocations(globalObject);
}
JS_PUBLIC_API JSObject* JS_NewObject(JSContext* cx, const JSClass* clasp) {
MOZ_ASSERT(!cx->zone()->isAtomsZone());
AssertHeapIsIdle();
CHECK_THREAD(cx);
if (!clasp) {
// Default class is Object.
return NewPlainObject(cx);
}
MOZ_ASSERT(!clasp->isJSFunction());
MOZ_ASSERT(clasp != &PlainObject::class_);
MOZ_ASSERT(clasp != &ArrayObject::class_);
MOZ_ASSERT(!(clasp->flags & JSCLASS_IS_GLOBAL));
return NewBuiltinClassInstance(cx, clasp);
}
JS_PUBLIC_API JSObject* JS_NewObjectWithGivenProto(JSContext* cx,
const JSClass* clasp,
HandleObject proto) {
MOZ_ASSERT(!cx->zone()->isAtomsZone());
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(proto);
if (!clasp) {
// Default class is Object.
return NewPlainObjectWithProto(cx, proto);
}
MOZ_ASSERT(!clasp->isJSFunction());
MOZ_ASSERT(clasp != &PlainObject::class_);
MOZ_ASSERT(clasp != &ArrayObject::class_);
MOZ_ASSERT(!(clasp->flags & JSCLASS_IS_GLOBAL));
return NewObjectWithGivenProto(cx, clasp, proto);
}
JS_PUBLIC_API JSObject* JS_NewPlainObject(JSContext* cx) {
MOZ_ASSERT(!cx->zone()->isAtomsZone());
AssertHeapIsIdle();
CHECK_THREAD(cx);
return NewPlainObject(cx);
}
JS_PUBLIC_API JSObject* JS_NewObjectForConstructor(JSContext* cx,
const JSClass* clasp,
const CallArgs& args) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
MOZ_ASSERT(!clasp->isJSFunction());
MOZ_ASSERT(clasp != &PlainObject::class_);
MOZ_ASSERT(clasp != &ArrayObject::class_);
MOZ_ASSERT(!(clasp->flags & JSCLASS_IS_GLOBAL));
if (!ThrowIfNotConstructing(cx, args, clasp->name)) {
return nullptr;
}
RootedObject newTarget(cx, &args.newTarget().toObject());
cx->check(newTarget);
RootedObject proto(cx);
if (!GetPrototypeFromConstructor(cx, newTarget,
JSCLASS_CACHED_PROTO_KEY(clasp), &proto)) {
return nullptr;
}
return NewObjectWithClassProto(cx, clasp, proto);
}
JS_PUBLIC_API bool JS_IsNative(JSObject* obj) {
return obj->is<NativeObject>();
}
JS_PUBLIC_API void JS::AssertObjectBelongsToCurrentThread(JSObject* obj) {
JSRuntime* rt = obj->compartment()->runtimeFromAnyThread();
MOZ_RELEASE_ASSERT(CurrentThreadCanAccessRuntime(rt));
}
JS_PUBLIC_API void JS::SetFilenameValidationCallback(
JS::FilenameValidationCallback cb) {
js::gFilenameValidationCallback = cb;
}
JS_PUBLIC_API void JS::SetHostEnsureCanAddPrivateElementHook(
JSContext* cx, JS::EnsureCanAddPrivateElementOp op) {
cx->runtime()->canAddPrivateElement = op;
}
/*** Standard internal methods **********************************************/
JS_PUBLIC_API bool JS_GetPrototype(JSContext* cx, HandleObject obj,
MutableHandleObject result) {
cx->check(obj);
return GetPrototype(cx, obj, result);
}
JS_PUBLIC_API bool JS_SetPrototype(JSContext* cx, HandleObject obj,
HandleObject proto) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(obj, proto);
return SetPrototype(cx, obj, proto);
}
JS_PUBLIC_API bool JS_GetPrototypeIfOrdinary(JSContext* cx, HandleObject obj,
bool* isOrdinary,
MutableHandleObject result) {
cx->check(obj);
return GetPrototypeIfOrdinary(cx, obj, isOrdinary, result);
}
JS_PUBLIC_API bool JS_IsExtensible(JSContext* cx, HandleObject obj,
bool* extensible) {
cx->check(obj);
return IsExtensible(cx, obj, extensible);
}
JS_PUBLIC_API bool JS_PreventExtensions(JSContext* cx, JS::HandleObject obj,
ObjectOpResult& result) {
cx->check(obj);
return PreventExtensions(cx, obj, result);
}
JS_PUBLIC_API bool JS_SetImmutablePrototype(JSContext* cx, JS::HandleObject obj,
bool* succeeded) {
cx->check(obj);
return SetImmutablePrototype(cx, obj, succeeded);
}
/* * */
JS_PUBLIC_API bool JS_FreezeObject(JSContext* cx, HandleObject obj) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(obj);
return FreezeObject(cx, obj);
}
static bool DeepFreezeSlot(JSContext* cx, const Value& v) {
if (v.isPrimitive()) {
return true;
}
RootedObject obj(cx, &v.toObject());
return JS_DeepFreezeObject(cx, obj);
}
JS_PUBLIC_API bool JS_DeepFreezeObject(JSContext* cx, HandleObject obj) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(obj);
// Assume that non-extensible objects are already deep-frozen, to avoid
// divergence.
bool extensible;
if (!IsExtensible(cx, obj, &extensible)) {
return false;
}
if (!extensible) {
return true;
}
if (!FreezeObject(cx, obj)) {
return false;
}
// Walk slots in obj and if any value is a non-null object, seal it.
if (obj->is<NativeObject>()) {
Rooted<NativeObject*> nobj(cx, &obj->as<NativeObject>());
for (uint32_t i = 0, n = nobj->slotSpan(); i < n; ++i) {
if (!DeepFreezeSlot(cx, nobj->getSlot(i))) {
return false;
}
}
for (uint32_t i = 0, n = nobj->getDenseInitializedLength(); i < n; ++i) {
if (!DeepFreezeSlot(cx, nobj->getDenseElement(i))) {
return false;
}
}
}
return true;
}
JS_PUBLIC_API bool JSPropertySpec::getValue(JSContext* cx,
MutableHandleValue vp) const {
MOZ_ASSERT(!isAccessor());
switch (u.value.type) {
case ValueWrapper::Type::String: {
Rooted<JSAtom*> atom(cx,
Atomize(cx, u.value.string, strlen(u.value.string)));
if (!atom) {
return false;
}
vp.setString(atom);
return true;
}
case ValueWrapper::Type::Int32:
vp.setInt32(u.value.int32);
return true;
case ValueWrapper::Type::Double:
vp.setDouble(u.value.double_);
return true;
}
MOZ_CRASH("Unexpected type");
}
bool PropertySpecNameToId(JSContext* cx, JSPropertySpec::Name name,
MutableHandleId id) {
if (name.isSymbol()) {
id.set(PropertyKey::Symbol(cx->wellKnownSymbols().get(name.symbol())));
} else {
JSAtom* atom = Atomize(cx, name.string(), strlen(name.string()));
if (!atom) {
return false;
}
id.set(AtomToId(atom));
}
return true;
}
JS_PUBLIC_API bool JS::PropertySpecNameToPermanentId(JSContext* cx,
JSPropertySpec::Name name,
jsid* idp) {
// We are calling fromMarkedLocation(idp) even though idp points to a
// location that will never be marked. This is OK because the whole point
// of this API is to populate *idp with a jsid that does not need to be
// marked.
MutableHandleId id = MutableHandleId::fromMarkedLocation(idp);
if (!PropertySpecNameToId(cx, name, id)) {
return false;
}
if (id.isString() && !PinAtom(cx, &id.toString()->asAtom())) {
return false;
}
return true;
}
JS_PUBLIC_API bool JS::ObjectToCompletePropertyDescriptor(
JSContext* cx, HandleObject obj, HandleValue descObj,
MutableHandle<PropertyDescriptor> desc) {
// |obj| can be in a different compartment here. The caller is responsible
// for wrapping it (see JS_WrapPropertyDescriptor).
cx->check(descObj);
if (!ToPropertyDescriptor(cx, descObj, true, desc)) {
return false;
}
CompletePropertyDescriptor(desc);
return true;
}
JS_PUBLIC_API void JS_SetAllNonReservedSlotsToUndefined(JS::HandleObject obj) {
if (!obj->is<NativeObject>()) {
return;
}
const JSClass* clasp = obj->getClass();
unsigned numReserved = JSCLASS_RESERVED_SLOTS(clasp);
unsigned numSlots = obj->as<NativeObject>().slotSpan();
for (unsigned i = numReserved; i < numSlots; i++) {
obj->as<NativeObject>().setSlot(i, UndefinedValue());
}
}
JS_PUBLIC_API void JS_SetReservedSlot(JSObject* obj, uint32_t index,
const Value& value) {
// Note: we don't use setReservedSlot so that this also works on swappable DOM
// objects. See NativeObject::getReservedSlotRef comment.
MOZ_ASSERT(index < JSCLASS_RESERVED_SLOTS(obj->getClass()));
obj->as<NativeObject>().setSlot(index, value);
}
JS_PUBLIC_API void JS_InitReservedSlot(JSObject* obj, uint32_t index, void* ptr,
size_t nbytes, JS::MemoryUse use) {
// Note: we don't use InitReservedSlot so that this also works on swappable
// DOM objects. See NativeObject::getReservedSlotRef comment.
MOZ_ASSERT(index < JSCLASS_RESERVED_SLOTS(obj->getClass()));
AddCellMemory(obj, nbytes, js::MemoryUse(use));
obj->as<NativeObject>().initSlot(index, PrivateValue(ptr));
}
JS_PUBLIC_API bool JS::IsMapObject(JSContext* cx, JS::HandleObject obj,
bool* isMap) {
return IsGivenTypeObject(cx, obj, ESClass::Map, isMap);
}
JS_PUBLIC_API bool JS::IsSetObject(JSContext* cx, JS::HandleObject obj,
bool* isSet) {
return IsGivenTypeObject(cx, obj, ESClass::Set, isSet);
}
JS_PUBLIC_API void JS_HoldPrincipals(JSPrincipals* principals) {
++principals->refcount;
}
JS_PUBLIC_API void JS_DropPrincipals(JSContext* cx, JSPrincipals* principals) {
int rc = --principals->refcount;
if (rc == 0) {
JS::AutoSuppressGCAnalysis nogc;
cx->runtime()->destroyPrincipals(principals);
}
}
JS_PUBLIC_API void JS_SetSecurityCallbacks(JSContext* cx,
const JSSecurityCallbacks* scb) {
MOZ_ASSERT(scb != &NullSecurityCallbacks);
cx->runtime()->securityCallbacks = scb ? scb : &NullSecurityCallbacks;
}
JS_PUBLIC_API const JSSecurityCallbacks* JS_GetSecurityCallbacks(
JSContext* cx) {
return (cx->runtime()->securityCallbacks != &NullSecurityCallbacks)
? cx->runtime()->securityCallbacks.ref()
: nullptr;
}
JS_PUBLIC_API void JS_SetTrustedPrincipals(JSContext* cx, JSPrincipals* prin) {
cx->runtime()->setTrustedPrincipals(prin);
}
extern JS_PUBLIC_API void JS_InitDestroyPrincipalsCallback(
JSContext* cx, JSDestroyPrincipalsOp destroyPrincipals) {
MOZ_ASSERT(destroyPrincipals);
MOZ_ASSERT(!cx->runtime()->destroyPrincipals);
cx->runtime()->destroyPrincipals = destroyPrincipals;
}
extern JS_PUBLIC_API void JS_InitReadPrincipalsCallback(
JSContext* cx, JSReadPrincipalsOp read) {
MOZ_ASSERT(read);
MOZ_ASSERT(!cx->runtime()->readPrincipals);
cx->runtime()->readPrincipals = read;
}
JS_PUBLIC_API JSFunction* JS_NewFunction(JSContext* cx, JSNative native,
unsigned nargs, unsigned flags,
const char* name) {
MOZ_ASSERT(!cx->zone()->isAtomsZone());
AssertHeapIsIdle();
CHECK_THREAD(cx);
Rooted<JSAtom*> atom(cx);
if (name) {
atom = Atomize(cx, name, strlen(name));
if (!atom) {
return nullptr;
}
}
return (flags & JSFUN_CONSTRUCTOR)
? NewNativeConstructor(cx, native, nargs, atom)
: NewNativeFunction(cx, native, nargs, atom);
}
JS_PUBLIC_API JSFunction* JS::GetSelfHostedFunction(JSContext* cx,
const char* selfHostedName,
HandleId id,
unsigned nargs) {
MOZ_ASSERT(!cx->zone()->isAtomsZone());
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(id);
Rooted<JSAtom*> name(cx, IdToFunctionName(cx, id));
if (!name) {
return nullptr;
}
JSAtom* shAtom = Atomize(cx, selfHostedName, strlen(selfHostedName));
if (!shAtom) {
return nullptr;
}
Rooted<PropertyName*> shName(cx, shAtom->asPropertyName());
RootedValue funVal(cx);
if (!GlobalObject::getSelfHostedFunction(cx, cx->global(), shName, name,
nargs, &funVal)) {
return nullptr;
}
return &funVal.toObject().as<JSFunction>();
}
JS_PUBLIC_API JSFunction* JS::NewFunctionFromSpec(JSContext* cx,
const JSFunctionSpec* fs,
HandleId id) {
cx->check(id);
#ifdef DEBUG
if (fs->name.isSymbol()) {
JS::Symbol* sym = cx->wellKnownSymbols().get(fs->name.symbol());
MOZ_ASSERT(PropertyKey::Symbol(sym) == id);
} else {
MOZ_ASSERT(id.isString() &&
StringEqualsAscii(id.toLinearString(), fs->name.string()));
}
#endif
// Delay cloning self-hosted functions until they are called. This is
// achieved by passing DefineFunction a nullptr JSNative which produces an
// interpreted JSFunction where !hasScript. Interpreted call paths then
// call InitializeLazyFunctionScript if !hasScript.
if (fs->selfHostedName) {
MOZ_ASSERT(!fs->call.op);
MOZ_ASSERT(!fs->call.info);
JSAtom* shAtom =
Atomize(cx, fs->selfHostedName, strlen(fs->selfHostedName));
if (!shAtom) {
return nullptr;
}
Rooted<PropertyName*> shName(cx, shAtom->asPropertyName());
Rooted<JSAtom*> name(cx, IdToFunctionName(cx, id));
if (!name) {
return nullptr;
}
RootedValue funVal(cx);
if (!GlobalObject::getSelfHostedFunction(cx, cx->global(), shName, name,
fs->nargs, &funVal)) {
return nullptr;
}
return &funVal.toObject().as<JSFunction>();
}
Rooted<JSAtom*> atom(cx, IdToFunctionName(cx, id));
if (!atom) {
return nullptr;
}
MOZ_ASSERT(fs->call.op);
JSFunction* fun;
if (fs->flags & JSFUN_CONSTRUCTOR) {
fun = NewNativeConstructor(cx, fs->call.op, fs->nargs, atom);
} else {
fun = NewNativeFunction(cx, fs->call.op, fs->nargs, atom);
}
if (!fun) {
return nullptr;
}
if (fs->call.info) {
fun->setJitInfo(fs->call.info);
}
return fun;
}
JS_PUBLIC_API JSFunction* JS::NewFunctionFromSpec(JSContext* cx,
const JSFunctionSpec* fs) {
RootedId id(cx);
if (!PropertySpecNameToId(cx, fs->name, &id)) {
return nullptr;
}
return NewFunctionFromSpec(cx, fs, id);
}
JS_PUBLIC_API JSObject* JS_GetFunctionObject(JSFunction* fun) { return fun; }
JS_PUBLIC_API JSString* JS_GetFunctionId(JSFunction* fun) {
return fun->explicitName();
}
JS_PUBLIC_API JSString* JS_GetFunctionDisplayId(JSFunction* fun) {
return fun->displayAtom();
}
JS_PUBLIC_API uint16_t JS_GetFunctionArity(JSFunction* fun) {
return fun->nargs();
}
JS_PUBLIC_API bool JS_GetFunctionLength(JSContext* cx, HandleFunction fun,
uint16_t* length) {
cx->check(fun);
return JSFunction::getLength(cx, fun, length);
}
JS_PUBLIC_API bool JS_ObjectIsFunction(JSObject* obj) {
return obj->is<JSFunction>();
}
JS_PUBLIC_API bool JS_IsNativeFunction(JSObject* funobj, JSNative call) {
if (!funobj->is<JSFunction>()) {
return false;
}
JSFunction* fun = &funobj->as<JSFunction>();
return fun->isNativeFun() && fun->native() == call;
}
extern JS_PUBLIC_API bool JS_IsConstructor(JSFunction* fun) {
return fun->isConstructor();
}
void JS::TransitiveCompileOptions::copyPODTransitiveOptions(
const TransitiveCompileOptions& rhs) {
// filename_, introducerFilename_, sourceMapURL_ should be handled in caller.
mutedErrors_ = rhs.mutedErrors_;
forceStrictMode_ = rhs.forceStrictMode_;
shouldResistFingerprinting_ = rhs.shouldResistFingerprinting_;
sourcePragmas_ = rhs.sourcePragmas_;
skipFilenameValidation_ = rhs.skipFilenameValidation_;
hideScriptFromDebugger_ = rhs.hideScriptFromDebugger_;
deferDebugMetadata_ = rhs.deferDebugMetadata_;
eagerDelazificationStrategy_ = rhs.eagerDelazificationStrategy_;
selfHostingMode = rhs.selfHostingMode;
asmJSOption = rhs.asmJSOption;
throwOnAsmJSValidationFailureOption = rhs.throwOnAsmJSValidationFailureOption;
forceAsync = rhs.forceAsync;
discardSource = rhs.discardSource;
sourceIsLazy = rhs.sourceIsLazy;
allowHTMLComments = rhs.allowHTMLComments;
nonSyntacticScope = rhs.nonSyntacticScope;
topLevelAwait = rhs.topLevelAwait;
importAssertions = rhs.importAssertions;
borrowBuffer = rhs.borrowBuffer;
usePinnedBytecode = rhs.usePinnedBytecode;
allocateInstantiationStorage = rhs.allocateInstantiationStorage;
deoptimizeModuleGlobalVars = rhs.deoptimizeModuleGlobalVars;
introductionType = rhs.introductionType;
introductionLineno = rhs.introductionLineno;
introductionOffset = rhs.introductionOffset;
hasIntroductionInfo = rhs.hasIntroductionInfo;
};
void JS::ReadOnlyCompileOptions::copyPODNonTransitiveOptions(
const ReadOnlyCompileOptions& rhs) {
lineno = rhs.lineno;
column = rhs.column;
scriptSourceOffset = rhs.scriptSourceOffset;
isRunOnce = rhs.isRunOnce;
noScriptRval = rhs.noScriptRval;
}
JS::OwningCompileOptions::OwningCompileOptions(JSContext* cx)
: ReadOnlyCompileOptions() {}
void JS::OwningCompileOptions::release() {
// OwningCompileOptions always owns these, so these casts are okay.
js_free(const_cast<char*>(filename_));
js_free(const_cast<char16_t*>(sourceMapURL_));
js_free(const_cast<char*>(introducerFilename_));
filename_ = nullptr;
sourceMapURL_ = nullptr;
introducerFilename_ = nullptr;
}
JS::OwningCompileOptions::~OwningCompileOptions() { release(); }
size_t JS::OwningCompileOptions::sizeOfExcludingThis(
mozilla::MallocSizeOf mallocSizeOf) const {
return mallocSizeOf(filename_) + mallocSizeOf(sourceMapURL_) +
mallocSizeOf(introducerFilename_);
}
bool JS::OwningCompileOptions::copy(JSContext* cx,
const ReadOnlyCompileOptions& rhs) {
// Release existing string allocations.
release();
copyPODNonTransitiveOptions(rhs);
copyPODTransitiveOptions(rhs);
if (rhs.filename()) {
filename_ = DuplicateString(cx, rhs.filename()).release();
if (!filename_) {
return false;
}
}
if (rhs.sourceMapURL()) {
sourceMapURL_ = DuplicateString(cx, rhs.sourceMapURL()).release();
if (!sourceMapURL_) {
return false;
}
}
if (rhs.introducerFilename()) {
introducerFilename_ =
DuplicateString(cx, rhs.introducerFilename()).release();
if (!introducerFilename_) {
return false;
}
}
return true;
}
JS::CompileOptions::CompileOptions(JSContext* cx) : ReadOnlyCompileOptions() {
if (!js::IsAsmJSCompilationAvailable(cx)) {
// Distinguishing the cases is just for error reporting.
asmJSOption = !cx->options().asmJS()
? AsmJSOption::DisabledByAsmJSPref
: AsmJSOption::DisabledByNoWasmCompiler;
} else if (cx->realm() && (cx->realm()->debuggerObservesWasm() ||
cx->realm()->debuggerObservesAsmJS())) {
asmJSOption = AsmJSOption::DisabledByDebugger;
} else {
asmJSOption = AsmJSOption::Enabled;
}
throwOnAsmJSValidationFailureOption =
cx->options().throwOnAsmJSValidationFailure();
importAssertions = cx->options().importAssertions();
sourcePragmas_ = cx->options().sourcePragmas();
// Certain modes of operation force strict-mode in general.
forceStrictMode_ = cx->options().strictMode();
// Certain modes of operation disallow syntax parsing in general.
if (coverage::IsLCovEnabled()) {
eagerDelazificationStrategy_ = DelazificationOption::ParseEverythingEagerly;
}
// Note: If we parse outside of a specific realm, we do not inherit any realm
// behaviours. These can still be set manually on the options though.
if (Realm* realm = cx->realm()) {
shouldResistFingerprinting_ =
realm->behaviors().shouldResistFingerprinting();
discardSource = realm->behaviors().discardSource();
}
}
CompileOptions& CompileOptions::setIntroductionInfoToCaller(
JSContext* cx, const char* introductionType,
MutableHandle<JSScript*> introductionScript) {
RootedScript maybeScript(cx);
const char* filename;
unsigned lineno;
uint32_t pcOffset;
bool mutedErrors;
DescribeScriptedCallerForCompilation(cx, &maybeScript, &filename, &lineno,
&pcOffset, &mutedErrors);
if (filename) {
introductionScript.set(maybeScript);
return setIntroductionInfo(filename, introductionType, lineno, pcOffset);
}
return setIntroductionType(introductionType);
}
JS_PUBLIC_API JSObject* JS_GetGlobalFromScript(JSScript* script) {
return &script->global();
}
JS_PUBLIC_API const char* JS_GetScriptFilename(JSScript* script) {
// This is called from ThreadStackHelper which can be called from another
// thread or inside a signal hander, so we need to be careful in case a
// copmacting GC is currently moving things around.
return script->maybeForwardedFilename();
}
JS_PUBLIC_API unsigned JS_GetScriptBaseLineNumber(JSContext* cx,
JSScript* script) {
return script->lineno();
}
JS_PUBLIC_API JSScript* JS_GetFunctionScript(JSContext* cx,
HandleFunction fun) {
if (fun->isNativeFun()) {
return nullptr;
}
if (fun->hasBytecode()) {
return fun->nonLazyScript();
}
AutoRealm ar(cx, fun);
JSScript* script = JSFunction::getOrCreateScript(cx, fun);
if (!script) {
MOZ_CRASH();
}
return script;
}
JS_PUBLIC_API JSString* JS_DecompileScript(JSContext* cx, HandleScript script) {
MOZ_ASSERT(!cx->zone()->isAtomsZone());
AssertHeapIsIdle();
CHECK_THREAD(cx);
RootedFunction fun(cx, script->function());
if (fun) {
return JS_DecompileFunction(cx, fun);
}
bool haveSource;
if (!ScriptSource::loadSource(cx, script->scriptSource(), &haveSource)) {
return nullptr;
}
return haveSource ? JSScript::sourceData(cx, script)
: NewStringCopyZ<CanGC>(cx, "[no source]");
}
JS_PUBLIC_API JSString* JS_DecompileFunction(JSContext* cx,
HandleFunction fun) {
MOZ_ASSERT(!cx->zone()->isAtomsZone());
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(fun);
return FunctionToString(cx, fun, /* isToSource = */ false);
}
JS_PUBLIC_API void JS::SetScriptPrivate(JSScript* script,
const JS::Value& value) {
JSRuntime* rt = script->zone()->runtimeFromMainThread();
script->sourceObject()->setPrivate(rt, value);
}
JS_PUBLIC_API JS::Value JS::GetScriptPrivate(JSScript* script) {
return script->sourceObject()->getPrivate();
}
JS_PUBLIC_API JS::Value JS::GetScriptedCallerPrivate(JSContext* cx) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
NonBuiltinFrameIter iter(cx, cx->realm()->principals());
if (iter.done() || !iter.hasScript()) {
return UndefinedValue();
}
return iter.script()->sourceObject()->getPrivate();
}
JS_PUBLIC_API void JS::SetScriptPrivateReferenceHooks(
JSRuntime* rt, JS::ScriptPrivateReferenceHook addRefHook,
JS::ScriptPrivateReferenceHook releaseHook) {
AssertHeapIsIdle();
rt->scriptPrivateAddRefHook = addRefHook;
rt->scriptPrivateReleaseHook = releaseHook;
}
JS_PUBLIC_API void JS::SetWaitCallback(JSRuntime* rt,
BeforeWaitCallback beforeWait,
AfterWaitCallback afterWait,
size_t requiredMemory) {
MOZ_RELEASE_ASSERT(requiredMemory <= WAIT_CALLBACK_CLIENT_MAXMEM);
MOZ_RELEASE_ASSERT((beforeWait == nullptr) == (afterWait == nullptr));
rt->beforeWaitCallback = beforeWait;
rt->afterWaitCallback = afterWait;
}
JS_PUBLIC_API bool JS_CheckForInterrupt(JSContext* cx) {
return js::CheckForInterrupt(cx);
}
JS_PUBLIC_API bool JS_AddInterruptCallback(JSContext* cx,
JSInterruptCallback callback) {
return cx->interruptCallbacks().append(callback);
}
JS_PUBLIC_API bool JS_DisableInterruptCallback(JSContext* cx) {
bool result = cx->interruptCallbackDisabled;
cx->interruptCallbackDisabled = true;
return result;
}
JS_PUBLIC_API void JS_ResetInterruptCallback(JSContext* cx, bool enable) {
cx->interruptCallbackDisabled = enable;
}
/************************************************************************/
/*
* Promises.
*/
JS_PUBLIC_API void JS::SetJobQueue(JSContext* cx, JobQueue* queue) {
cx->jobQueue = queue;
}
extern JS_PUBLIC_API void JS::SetPromiseRejectionTrackerCallback(
JSContext* cx, PromiseRejectionTrackerCallback callback,
void* data /* = nullptr */) {
cx->promiseRejectionTrackerCallback = callback;
cx->promiseRejectionTrackerCallbackData = data;
}
extern JS_PUBLIC_API void JS::JobQueueIsEmpty(JSContext* cx) {
cx->canSkipEnqueuingJobs = true;
}
extern JS_PUBLIC_API void JS::JobQueueMayNotBeEmpty(JSContext* cx) {
cx->canSkipEnqueuingJobs = false;
}
JS_PUBLIC_API JSObject* JS::NewPromiseObject(JSContext* cx,
HandleObject executor) {
MOZ_ASSERT(!cx->zone()->isAtomsZone());
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(executor);
if (!executor) {
return PromiseObject::createSkippingExecutor(cx);
}
MOZ_ASSERT(IsCallable(executor));
return PromiseObject::create(cx, executor);
}
JS_PUBLIC_API bool JS::IsPromiseObject(JS::HandleObject obj) {
return obj->is<PromiseObject>();
}
JS_PUBLIC_API JSObject* JS::GetPromiseConstructor(JSContext* cx) {
CHECK_THREAD(cx);
Rooted<GlobalObject*> global(cx, cx->global());
return GlobalObject::getOrCreatePromiseConstructor(cx, global);
}
JS_PUBLIC_API JSObject* JS::GetPromisePrototype(JSContext* cx) {
CHECK_THREAD(cx);
Rooted<GlobalObject*> global(cx, cx->global());
return GlobalObject::getOrCreatePromisePrototype(cx, global);
}
JS_PUBLIC_API JS::PromiseState JS::GetPromiseState(JS::HandleObject promise) {
PromiseObject* promiseObj = promise->maybeUnwrapIf<PromiseObject>();
if (!promiseObj) {
return JS::PromiseState::Pending;
}
return promiseObj->state();
}
JS_PUBLIC_API uint64_t JS::GetPromiseID(JS::HandleObject promise) {
return promise->as<PromiseObject>().getID();
}
JS_PUBLIC_API JS::Value JS::GetPromiseResult(JS::HandleObject promiseObj) {
PromiseObject* promise = &promiseObj->as<PromiseObject>();
MOZ_ASSERT(promise->state() != JS::PromiseState::Pending);
return promise->state() == JS::PromiseState::Fulfilled ? promise->value()
: promise->reason();
}
JS_PUBLIC_API bool JS::GetPromiseIsHandled(JS::HandleObject promise) {
PromiseObject* promiseObj = &promise->as<PromiseObject>();
return !promiseObj->isUnhandled();
}
static PromiseObject* UnwrapPromise(JSContext* cx, JS::HandleObject promise,
mozilla::Maybe<AutoRealm>& ar) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(promise);
PromiseObject* promiseObj;
if (IsWrapper(promise)) {
promiseObj = promise->maybeUnwrapAs<PromiseObject>();
if (!promiseObj) {
ReportAccessDenied(cx);
return nullptr;
}
ar.emplace(cx, promiseObj);
} else {
promiseObj = promise.as<PromiseObject>();
}
return promiseObj;
}
JS_PUBLIC_API bool JS::SetSettledPromiseIsHandled(JSContext* cx,
JS::HandleObject promise) {
mozilla::Maybe<AutoRealm> ar;
Rooted<PromiseObject*> promiseObj(cx, UnwrapPromise(cx, promise, ar));
if (!promiseObj) {
return false;
}
js::SetSettledPromiseIsHandled(cx, promiseObj);
return true;
}
JS_PUBLIC_API bool JS::SetAnyPromiseIsHandled(JSContext* cx,
JS::HandleObject promise) {
mozilla::Maybe<AutoRealm> ar;
Rooted<PromiseObject*> promiseObj(cx, UnwrapPromise(cx, promise, ar));
if (!promiseObj) {
return false;
}
js::SetAnyPromiseIsHandled(cx, promiseObj);
return true;
}
JS_PUBLIC_API JSObject* JS::GetPromiseAllocationSite(JS::HandleObject promise) {
return promise->as<PromiseObject>().allocationSite();
}
JS_PUBLIC_API JSObject* JS::GetPromiseResolutionSite(JS::HandleObject promise) {
return promise->as<PromiseObject>().resolutionSite();
}
#ifdef DEBUG
JS_PUBLIC_API void JS::DumpPromiseAllocationSite(JSContext* cx,
JS::HandleObject promise) {
RootedObject stack(cx, promise->as<PromiseObject>().allocationSite());
JSPrincipals* principals = cx->realm()->principals();
UniqueChars stackStr = BuildUTF8StackString(cx, principals, stack);
if (stackStr) {
fputs(stackStr.get(), stderr);
}
}
JS_PUBLIC_API void JS::DumpPromiseResolutionSite(JSContext* cx,
JS::HandleObject promise) {
RootedObject stack(cx, promise->as<PromiseObject>().resolutionSite());
JSPrincipals* principals = cx->realm()->principals();
UniqueChars stackStr = BuildUTF8StackString(cx, principals, stack);
if (stackStr) {
fputs(stackStr.get(), stderr);
}
}
#endif
JS_PUBLIC_API JSObject* JS::CallOriginalPromiseResolve(
JSContext* cx, JS::HandleValue resolutionValue) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(resolutionValue);
RootedObject promise(cx,
PromiseObject::unforgeableResolve(cx, resolutionValue));
MOZ_ASSERT_IF(promise, promise->canUnwrapAs<PromiseObject>());
return promise;
}
JS_PUBLIC_API JSObject* JS::CallOriginalPromiseReject(
JSContext* cx, JS::HandleValue rejectionValue) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(rejectionValue);
RootedObject promise(cx,
PromiseObject::unforgeableReject(cx, rejectionValue));
MOZ_ASSERT_IF(promise, promise->canUnwrapAs<PromiseObject>());
return promise;
}
static bool ResolveOrRejectPromise(JSContext* cx, JS::HandleObject promiseObj,
JS::HandleValue resultOrReason_,
bool reject) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(promiseObj, resultOrReason_);
mozilla::Maybe<AutoRealm> ar;
Rooted<PromiseObject*> promise(cx);
RootedValue resultOrReason(cx, resultOrReason_);
if (IsWrapper(promiseObj)) {
promise = promiseObj->maybeUnwrapAs<PromiseObject>();
if (!promise) {
ReportAccessDenied(cx);
return false;
}
ar.emplace(cx, promise);
if (!cx->compartment()->wrap(cx, &resultOrReason)) {
return false;
}
} else {
promise = promiseObj.as<PromiseObject>();
}
return reject ? PromiseObject::reject(cx, promise, resultOrReason)
: PromiseObject::resolve(cx, promise, resultOrReason);
}
JS_PUBLIC_API bool JS::ResolvePromise(JSContext* cx,
JS::HandleObject promiseObj,
JS::HandleValue resolutionValue) {
return ResolveOrRejectPromise(cx, promiseObj, resolutionValue, false);
}
JS_PUBLIC_API bool JS::RejectPromise(JSContext* cx, JS::HandleObject promiseObj,
JS::HandleValue rejectionValue) {
return ResolveOrRejectPromise(cx, promiseObj, rejectionValue, true);
}
JS_PUBLIC_API JSObject* JS::CallOriginalPromiseThen(
JSContext* cx, JS::HandleObject promiseObj, JS::HandleObject onFulfilled,
JS::HandleObject onRejected) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(promiseObj, onFulfilled, onRejected);
MOZ_ASSERT_IF(onFulfilled, IsCallable(onFulfilled));
MOZ_ASSERT_IF(onRejected, IsCallable(onRejected));
return OriginalPromiseThen(cx, promiseObj, onFulfilled, onRejected);
}
[[nodiscard]] static bool ReactToPromise(JSContext* cx,
JS::Handle<JSObject*> promiseObj,
JS::Handle<JSObject*> onFulfilled,
JS::Handle<JSObject*> onRejected,
UnhandledRejectionBehavior behavior) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(promiseObj, onFulfilled, onRejected);
MOZ_ASSERT_IF(onFulfilled, IsCallable(onFulfilled));
MOZ_ASSERT_IF(onRejected, IsCallable(onRejected));
Rooted<PromiseObject*> unwrappedPromise(cx);
{
RootedValue promiseVal(cx, ObjectValue(*promiseObj));
unwrappedPromise = UnwrapAndTypeCheckValue<PromiseObject>(
cx, promiseVal, [cx, promiseObj] {
JS_ReportErrorNumberLatin1(cx, GetErrorMessage, nullptr,
JSMSG_INCOMPATIBLE_PROTO, "Promise",
"then", promiseObj->getClass()->name);
});
if (!unwrappedPromise) {
return false;
}
}
return ReactToUnwrappedPromise(cx, unwrappedPromise, onFulfilled, onRejected,
behavior);
}
JS_PUBLIC_API bool JS::AddPromiseReactions(JSContext* cx,
JS::HandleObject promiseObj,
JS::HandleObject onFulfilled,
JS::HandleObject onRejected) {
return ReactToPromise(cx, promiseObj, onFulfilled, onRejected,
UnhandledRejectionBehavior::Report);
}
JS_PUBLIC_API bool JS::AddPromiseReactionsIgnoringUnhandledRejection(
JSContext* cx, JS::HandleObject promiseObj, JS::HandleObject onFulfilled,
JS::HandleObject onRejected) {
return ReactToPromise(cx, promiseObj, onFulfilled, onRejected,
UnhandledRejectionBehavior::Ignore);
}
JS_PUBLIC_API JS::PromiseUserInputEventHandlingState
JS::GetPromiseUserInputEventHandlingState(JS::HandleObject promiseObj_) {
PromiseObject* promise = promiseObj_->maybeUnwrapIf<PromiseObject>();
if (!promise) {
return JS::PromiseUserInputEventHandlingState::DontCare;
}
if (!promise->requiresUserInteractionHandling()) {
return JS::PromiseUserInputEventHandlingState::DontCare;
}
if (promise->hadUserInteractionUponCreation()) {
return JS::PromiseUserInputEventHandlingState::HadUserInteractionAtCreation;
}
return JS::PromiseUserInputEventHandlingState::
DidntHaveUserInteractionAtCreation;
}
JS_PUBLIC_API bool JS::SetPromiseUserInputEventHandlingState(
JS::HandleObject promiseObj_,
JS::PromiseUserInputEventHandlingState state) {
PromiseObject* promise = promiseObj_->maybeUnwrapIf<PromiseObject>();
if (!promise) {
return false;
}
switch (state) {
case JS::PromiseUserInputEventHandlingState::DontCare:
promise->setRequiresUserInteractionHandling(false);
break;
case JS::PromiseUserInputEventHandlingState::HadUserInteractionAtCreation:
promise->setRequiresUserInteractionHandling(true);
promise->setHadUserInteractionUponCreation(true);
break;
case JS::PromiseUserInputEventHandlingState::
DidntHaveUserInteractionAtCreation:
promise->setRequiresUserInteractionHandling(true);
promise->setHadUserInteractionUponCreation(false);
break;
default:
MOZ_ASSERT_UNREACHABLE(
"Invalid PromiseUserInputEventHandlingState enum value");
return false;
}
return true;
}
/**
* Unforgeable version of Promise.all for internal use.
*
* Takes a dense array of Promise objects and returns a promise that's
* resolved with an array of resolution values when all those promises ahve
* been resolved, or rejected with the rejection value of the first rejected
* promise.
*
* Asserts that the array is dense and all entries are Promise objects.
*/
JS_PUBLIC_API JSObject* JS::GetWaitForAllPromise(
JSContext* cx, JS::HandleObjectVector promises) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
return js::GetWaitForAllPromise(cx, promises);
}
JS_PUBLIC_API void JS::InitDispatchToEventLoop(
JSContext* cx, JS::DispatchToEventLoopCallback callback, void* closure) {
cx->runtime()->offThreadPromiseState.ref().init(callback, closure);
}
JS_PUBLIC_API void JS::ShutdownAsyncTasks(JSContext* cx) {
cx->runtime()->offThreadPromiseState.ref().shutdown(cx);
}
JS_PUBLIC_API void JS::InitConsumeStreamCallback(
JSContext* cx, ConsumeStreamCallback consume,
ReportStreamErrorCallback report) {
cx->runtime()->consumeStreamCallback = consume;
cx->runtime()->reportStreamErrorCallback = report;
}
JS_PUBLIC_API void JS_RequestInterruptCallback(JSContext* cx) {
cx->requestInterrupt(InterruptReason::CallbackUrgent);
}
JS_PUBLIC_API void JS_RequestInterruptCallbackCanWait(JSContext* cx) {
cx->requestInterrupt(InterruptReason::CallbackCanWait);
}
JS::AutoSetAsyncStackForNewCalls::AutoSetAsyncStackForNewCalls(
JSContext* cx, HandleObject stack, const char* asyncCause,
JS::AutoSetAsyncStackForNewCalls::AsyncCallKind kind)
: cx(cx),
oldAsyncStack(cx, cx->asyncStackForNewActivations()),
oldAsyncCause(cx->asyncCauseForNewActivations),
oldAsyncCallIsExplicit(cx->asyncCallIsExplicit) {
CHECK_THREAD(cx);
// The option determines whether we actually use the new values at this
// point. It will not affect restoring the previous values when the object
// is destroyed, so if the option changes it won't cause consistency issues.
if (!cx->options().asyncStack()) {
return;
}
SavedFrame* asyncStack = &stack->as<SavedFrame>();
cx->asyncStackForNewActivations() = asyncStack;
cx->asyncCauseForNewActivations = asyncCause;
cx->asyncCallIsExplicit = kind == AsyncCallKind::EXPLICIT;
}
JS::AutoSetAsyncStackForNewCalls::~AutoSetAsyncStackForNewCalls() {
cx->asyncCauseForNewActivations = oldAsyncCause;
cx->asyncStackForNewActivations() =
oldAsyncStack ? &oldAsyncStack->as<SavedFrame>() : nullptr;
cx->asyncCallIsExplicit = oldAsyncCallIsExplicit;
}
/************************************************************************/
JS_PUBLIC_API JSString* JS_NewStringCopyN(JSContext* cx, const char* s,
size_t n) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
return NewStringCopyN<CanGC>(cx, s, n);
}
JS_PUBLIC_API JSString* JS_NewStringCopyZ(JSContext* cx, const char* s) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
if (!s) {
return cx->runtime()->emptyString;
}
return NewStringCopyZ<CanGC>(cx, s);
}
JS_PUBLIC_API JSString* JS_NewStringCopyUTF8Z(JSContext* cx,
const JS::ConstUTF8CharsZ s) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
return NewStringCopyUTF8Z(cx, s);
}
JS_PUBLIC_API JSString* JS_NewStringCopyUTF8N(JSContext* cx,
const JS::UTF8Chars s) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
return NewStringCopyUTF8N(cx, s);
}
JS_PUBLIC_API bool JS_StringHasBeenPinned(JSContext* cx, JSString* str) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
if (!str->isAtom()) {
return false;
}
return AtomIsPinned(cx, &str->asAtom());
}
JS_PUBLIC_API JSString* JS_AtomizeString(JSContext* cx, const char* s) {
return JS_AtomizeStringN(cx, s, strlen(s));
}
JS_PUBLIC_API JSString* JS_AtomizeStringN(JSContext* cx, const char* s,
size_t length) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
return Atomize(cx, s, length);
}
JS_PUBLIC_API JSString* JS_AtomizeAndPinString(JSContext* cx, const char* s) {
return JS_AtomizeAndPinStringN(cx, s, strlen(s));
}
JS_PUBLIC_API JSString* JS_AtomizeAndPinStringN(JSContext* cx, const char* s,
size_t length) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
JSAtom* atom = cx->zone() ? Atomize(cx, s, length)
: AtomizeWithoutActiveZone(cx, s, length);
if (!atom || !PinAtom(cx, atom)) {
return nullptr;
}
MOZ_ASSERT(JS_StringHasBeenPinned(cx, atom));
return atom;
}
JS_PUBLIC_API JSString* JS_NewLatin1String(
JSContext* cx, js::UniquePtr<JS::Latin1Char[], JS::FreePolicy> chars,
size_t length) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
return NewString<CanGC>(cx, std::move(chars), length);
}
JS_PUBLIC_API JSString* JS_NewUCString(JSContext* cx,
JS::UniqueTwoByteChars chars,
size_t length) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
return NewString<CanGC>(cx, std::move(chars), length);
}
JS_PUBLIC_API JSString* JS_NewUCStringDontDeflate(JSContext* cx,
JS::UniqueTwoByteChars chars,
size_t length) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
return NewStringDontDeflate<CanGC>(cx, std::move(chars), length);
}
JS_PUBLIC_API JSString* JS_NewUCStringCopyN(JSContext* cx, const char16_t* s,
size_t n) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
if (!n) {
return cx->names().empty;
}
return NewStringCopyN<CanGC>(cx, s, n);
}
JS_PUBLIC_API JSString* JS_NewUCStringCopyZ(JSContext* cx, const char16_t* s) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
if (!s) {
return cx->runtime()->emptyString;
}
return NewStringCopyZ<CanGC>(cx, s);
}
JS_PUBLIC_API JSString* JS_AtomizeUCString(JSContext* cx, const char16_t* s) {
return JS_AtomizeUCStringN(cx, s, js_strlen(s));
}
JS_PUBLIC_API JSString* JS_AtomizeUCStringN(JSContext* cx, const char16_t* s,
size_t length) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
return AtomizeChars(cx, s, length);
}
JS_PUBLIC_API size_t JS_GetStringLength(JSString* str) { return str->length(); }
JS_PUBLIC_API bool JS_StringIsLinear(JSString* str) { return str->isLinear(); }
JS_PUBLIC_API bool JS_DeprecatedStringHasLatin1Chars(JSString* str) {
return str->hasLatin1Chars();
}
JS_PUBLIC_API const JS::Latin1Char* JS_GetLatin1StringCharsAndLength(
JSContext* cx, const JS::AutoRequireNoGC& nogc, JSString* str,
size_t* plength) {
MOZ_ASSERT(plength);
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(str);
JSLinearString* linear = str->ensureLinear(cx);
if (!linear) {
return nullptr;
}
*plength = linear->length();
return linear->latin1Chars(nogc);
}
JS_PUBLIC_API const char16_t* JS_GetTwoByteStringCharsAndLength(
JSContext* cx, const JS::AutoRequireNoGC& nogc, JSString* str,
size_t* plength) {
MOZ_ASSERT(plength);
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(str);
JSLinearString* linear = str->ensureLinear(cx);
if (!linear) {
return nullptr;
}
*plength = linear->length();
return linear->twoByteChars(nogc);
}
JS_PUBLIC_API const char16_t* JS_GetTwoByteExternalStringChars(JSString* str) {
return str->asExternal().twoByteChars();
}
JS_PUBLIC_API bool JS_GetStringCharAt(JSContext* cx, JSString* str,
size_t index, char16_t* res) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(str);
JSLinearString* linear = str->ensureLinear(cx);
if (!linear) {
return false;
}
*res = linear->latin1OrTwoByteChar(index);
return true;
}
JS_PUBLIC_API bool JS_CopyStringChars(JSContext* cx,
mozilla::Range<char16_t> dest,
JSString* str) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(str);
JSLinearString* linear = str->ensureLinear(cx);
if (!linear) {
return false;
}
MOZ_ASSERT(linear->length() <= dest.length());
CopyChars(dest.begin().get(), *linear);
return true;
}
extern JS_PUBLIC_API JS::UniqueTwoByteChars JS_CopyStringCharsZ(JSContext* cx,
JSString* str) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
JSLinearString* linear = str->ensureLinear(cx);
if (!linear) {
return nullptr;
}
size_t len = linear->length();
static_assert(JS::MaxStringLength < UINT32_MAX,
"len + 1 must not overflow on 32-bit platforms");
UniqueTwoByteChars chars(cx->pod_malloc<char16_t>(len + 1));
if (!chars) {
return nullptr;
}
CopyChars(chars.get(), *linear);
chars[len] = '\0';
return chars;
}
extern JS_PUBLIC_API JSLinearString* JS_EnsureLinearString(JSContext* cx,
JSString* str) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(str);
return str->ensureLinear(cx);
}
JS_PUBLIC_API bool JS_CompareStrings(JSContext* cx, JSString* str1,
JSString* str2, int32_t* result) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
return CompareStrings(cx, str1, str2, result);
}
JS_PUBLIC_API bool JS_StringEqualsAscii(JSContext* cx, JSString* str,
const char* asciiBytes, bool* match) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
JSLinearString* linearStr = str->ensureLinear(cx);
if (!linearStr) {
return false;
}
*match = StringEqualsAscii(linearStr, asciiBytes);
return true;
}
JS_PUBLIC_API bool JS_StringEqualsAscii(JSContext* cx, JSString* str,
const char* asciiBytes, size_t length,
bool* match) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
JSLinearString* linearStr = str->ensureLinear(cx);
if (!linearStr) {
return false;
}
*match = StringEqualsAscii(linearStr, asciiBytes, length);
return true;
}
JS_PUBLIC_API bool JS_LinearStringEqualsAscii(JSLinearString* str,
const char* asciiBytes) {
return StringEqualsAscii(str, asciiBytes);
}
JS_PUBLIC_API bool JS_LinearStringEqualsAscii(JSLinearString* str,
const char* asciiBytes,
size_t length) {
return StringEqualsAscii(str, asciiBytes, length);
}
JS_PUBLIC_API size_t JS_PutEscapedLinearString(char* buffer, size_t size,
JSLinearString* str,
char quote) {
return PutEscapedString(buffer, size, str, quote);
}
JS_PUBLIC_API size_t JS_PutEscapedString(JSContext* cx, char* buffer,
size_t size, JSString* str,
char quote) {
AssertHeapIsIdle();
JSLinearString* linearStr = str->ensureLinear(cx);
if (!linearStr) {
return size_t(-1);
}
return PutEscapedString(buffer, size, linearStr, quote);
}
JS_PUBLIC_API JSString* JS_NewDependentString(JSContext* cx, HandleString str,
size_t start, size_t length) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
return NewDependentString(cx, str, start, length);
}
JS_PUBLIC_API JSString* JS_ConcatStrings(JSContext* cx, HandleString left,
HandleString right) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
return ConcatStrings<CanGC>(cx, left, right);
}
JS_PUBLIC_API bool JS_DecodeBytes(JSContext* cx, const char* src, size_t srclen,
char16_t* dst, size_t* dstlenp) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
if (!dst) {
*dstlenp = srclen;
return true;
}
size_t dstlen = *dstlenp;
if (srclen > dstlen) {
CopyAndInflateChars(dst, src, dstlen);
gc::AutoSuppressGC suppress(cx);
JS_ReportErrorNumberASCII(cx, GetErrorMessage, nullptr,
JSMSG_BUFFER_TOO_SMALL);
return false;
}
CopyAndInflateChars(dst, src, srclen);
*dstlenp = srclen;
return true;
}
JS_PUBLIC_API JS::UniqueChars JS_EncodeStringToASCII(JSContext* cx,
JSString* str) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
return js::EncodeAscii(cx, str);
}
JS_PUBLIC_API JS::UniqueChars JS_EncodeStringToLatin1(JSContext* cx,
JSString* str) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
return js::EncodeLatin1(cx, str);
}
JS_PUBLIC_API JS::UniqueChars JS_EncodeStringToUTF8(JSContext* cx,
HandleString str) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
return StringToNewUTF8CharsZ(cx, *str);
}
JS_PUBLIC_API size_t JS_GetStringEncodingLength(JSContext* cx, JSString* str) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
if (!str->ensureLinear(cx)) {
return size_t(-1);
}
return str->length();
}
JS_PUBLIC_API bool JS_EncodeStringToBuffer(JSContext* cx, JSString* str,
char* buffer, size_t length) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
JSLinearString* linear = str->ensureLinear(cx);
if (!linear) {
return false;
}
JS::AutoCheckCannotGC nogc;
size_t writeLength = std::min(linear->length(), length);
if (linear->hasLatin1Chars()) {
mozilla::PodCopy(reinterpret_cast<Latin1Char*>(buffer),
linear->latin1Chars(nogc), writeLength);
} else {
const char16_t* src = linear->twoByteChars(nogc);
for (size_t i = 0; i < writeLength; i++) {
buffer[i] = char(src[i]);
}
}
return true;
}
JS_PUBLIC_API mozilla::Maybe<std::tuple<size_t, size_t>>
JS_EncodeStringToUTF8BufferPartial(JSContext* cx, JSString* str,
mozilla::Span<char> buffer) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
JS::AutoCheckCannotGC nogc;
return str->encodeUTF8Partial(nogc, buffer);
}
JS_PUBLIC_API JS::Symbol* JS::NewSymbol(JSContext* cx,
HandleString description) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
if (description) {
cx->check(description);
}
return Symbol::new_(cx, SymbolCode::UniqueSymbol, description);
}
JS_PUBLIC_API JS::Symbol* JS::GetSymbolFor(JSContext* cx, HandleString key) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(key);
return Symbol::for_(cx, key);
}
JS_PUBLIC_API JSString* JS::GetSymbolDescription(HandleSymbol symbol) {
return symbol->description();
}
JS_PUBLIC_API JS::SymbolCode JS::GetSymbolCode(Handle<Symbol*> symbol) {
return symbol->code();
}
JS_PUBLIC_API JS::Symbol* JS::GetWellKnownSymbol(JSContext* cx,
JS::SymbolCode which) {
return cx->wellKnownSymbols().get(which);
}
JS_PUBLIC_API JS::PropertyKey JS::GetWellKnownSymbolKey(JSContext* cx,
JS::SymbolCode which) {
return PropertyKey::Symbol(cx->wellKnownSymbols().get(which));
}
static bool AddPrefix(JSContext* cx, JS::Handle<JS::PropertyKey> id,
FunctionPrefixKind prefixKind,
JS::MutableHandle<JS::PropertyKey> out) {
JS::Rooted<JSAtom*> atom(cx, js::IdToFunctionName(cx, id, prefixKind));
if (!atom) {
return false;
}
out.set(JS::PropertyKey::NonIntAtom(atom));
return true;
}
JS_PUBLIC_API bool JS::ToGetterId(JSContext* cx, JS::Handle<JS::PropertyKey> id,
JS::MutableHandle<JS::PropertyKey> getterId) {
return AddPrefix(cx, id, FunctionPrefixKind::Get, getterId);
}
JS_PUBLIC_API bool JS::ToSetterId(JSContext* cx, JS::Handle<JS::PropertyKey> id,
JS::MutableHandle<JS::PropertyKey> setterId) {
return AddPrefix(cx, id, FunctionPrefixKind::Set, setterId);
}
#ifdef DEBUG
static bool PropertySpecNameIsDigits(JSPropertySpec::Name name) {
if (name.isSymbol()) {
return false;
}
const char* s = name.string();
if (!*s) {
return false;
}
for (; *s; s++) {
if (*s < '0' || *s > '9') {
return false;
}
}
return true;
}
#endif // DEBUG
JS_PUBLIC_API bool JS::PropertySpecNameEqualsId(JSPropertySpec::Name name,
HandleId id) {
if (name.isSymbol()) {
return id.isWellKnownSymbol(name.symbol());
}
MOZ_ASSERT(!PropertySpecNameIsDigits(name));
return id.isAtom() && JS_LinearStringEqualsAscii(id.toAtom(), name.string());
}
JS_PUBLIC_API bool JS_Stringify(JSContext* cx, MutableHandleValue vp,
HandleObject replacer, HandleValue space,
JSONWriteCallback callback, void* data) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(replacer, space);
StringBuffer sb(cx);
if (!sb.ensureTwoByteChars()) {
return false;
}
if (!Stringify(cx, vp, replacer, space, sb, StringifyBehavior::Normal)) {
return false;
}
if (sb.empty() && !sb.append(cx->names().null)) {
return false;
}
return callback(sb.rawTwoByteBegin(), sb.length(), data);
}
JS_PUBLIC_API bool JS::ToJSON(JSContext* cx, HandleValue value,
HandleObject replacer, HandleValue space,
JSONWriteCallback callback, void* data) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(replacer, space);
StringBuffer sb(cx);
if (!sb.ensureTwoByteChars()) {
return false;
}
RootedValue v(cx, value);
if (!Stringify(cx, &v, replacer, space, sb, StringifyBehavior::Normal)) {
return false;
}
if (sb.empty()) {
return true;
}
return callback(sb.rawTwoByteBegin(), sb.length(), data);
}
JS_PUBLIC_API bool JS::ToJSONMaybeSafely(JSContext* cx, JS::HandleObject input,
JSONWriteCallback callback,
void* data) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(input);
StringBuffer sb(cx);
if (!sb.ensureTwoByteChars()) {
return false;
}
RootedValue inputValue(cx, ObjectValue(*input));
if (!Stringify(cx, &inputValue, nullptr, NullHandleValue, sb,
StringifyBehavior::RestrictedSafe))
return false;
if (sb.empty() && !sb.append(cx->names().null)) {
return false;
}
return callback(sb.rawTwoByteBegin(), sb.length(), data);
}
JS_PUBLIC_API bool JS_ParseJSON(JSContext* cx, const char16_t* chars,
uint32_t len, MutableHandleValue vp) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
return ParseJSONWithReviver(cx, mozilla::Range<const char16_t>(chars, len),
NullHandleValue, vp);
}
JS_PUBLIC_API bool JS_ParseJSON(JSContext* cx, HandleString str,
MutableHandleValue vp) {
return JS_ParseJSONWithReviver(cx, str, NullHandleValue, vp);
}
JS_PUBLIC_API bool JS_ParseJSON(JSContext* cx, const Latin1Char* chars,
uint32_t len, MutableHandleValue vp) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
return ParseJSONWithReviver(cx, mozilla::Range<const Latin1Char>(chars, len),
NullHandleValue, vp);
}
JS_PUBLIC_API bool JS_ParseJSONWithReviver(JSContext* cx, const char16_t* chars,
uint32_t len, HandleValue reviver,
MutableHandleValue vp) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
return ParseJSONWithReviver(cx, mozilla::Range<const char16_t>(chars, len),
reviver, vp);
}
JS_PUBLIC_API bool JS_ParseJSONWithReviver(JSContext* cx, HandleString str,
HandleValue reviver,
MutableHandleValue vp) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(str);
AutoStableStringChars stableChars(cx);
if (!stableChars.init(cx, str)) {
return false;
}
return stableChars.isLatin1()
? ParseJSONWithReviver(cx, stableChars.latin1Range(), reviver, vp)
: ParseJSONWithReviver(cx, stableChars.twoByteRange(), reviver,
vp);
}
/************************************************************************/
JS_PUBLIC_API void JS_ReportErrorASCII(JSContext* cx, const char* format, ...) {
va_list ap;
AssertHeapIsIdle();
va_start(ap, format);
ReportErrorVA(cx, IsWarning::No, format, ArgumentsAreASCII, ap);
va_end(ap);
}
JS_PUBLIC_API void JS_ReportErrorLatin1(JSContext* cx, const char* format,
...) {
va_list ap;
AssertHeapIsIdle();
va_start(ap, format);
ReportErrorVA(cx, IsWarning::No, format, ArgumentsAreLatin1, ap);
va_end(ap);
}
JS_PUBLIC_API void JS_ReportErrorUTF8(JSContext* cx, const char* format, ...) {
va_list ap;
AssertHeapIsIdle();
va_start(ap, format);
ReportErrorVA(cx, IsWarning::No, format, ArgumentsAreUTF8, ap);
va_end(ap);
}
JS_PUBLIC_API void JS_ReportErrorNumberASCII(JSContext* cx,
JSErrorCallback errorCallback,
void* userRef,
const unsigned errorNumber, ...) {
va_list ap;
va_start(ap, errorNumber);
JS_ReportErrorNumberASCIIVA(cx, errorCallback, userRef, errorNumber, ap);
va_end(ap);
}
JS_PUBLIC_API void JS_ReportErrorNumberASCIIVA(JSContext* cx,
JSErrorCallback errorCallback,
void* userRef,
const unsigned errorNumber,
va_list ap) {
AssertHeapIsIdle();
ReportErrorNumberVA(cx, IsWarning::No, errorCallback, userRef, errorNumber,
ArgumentsAreASCII, ap);
}
JS_PUBLIC_API void JS_ReportErrorNumberLatin1(JSContext* cx,
JSErrorCallback errorCallback,
void* userRef,
const unsigned errorNumber, ...) {
va_list ap;
va_start(ap, errorNumber);
JS_ReportErrorNumberLatin1VA(cx, errorCallback, userRef, errorNumber, ap);
va_end(ap);
}
JS_PUBLIC_API void JS_ReportErrorNumberLatin1VA(JSContext* cx,
JSErrorCallback errorCallback,
void* userRef,
const unsigned errorNumber,
va_list ap) {
AssertHeapIsIdle();
ReportErrorNumberVA(cx, IsWarning::No, errorCallback, userRef, errorNumber,
ArgumentsAreLatin1, ap);
}
JS_PUBLIC_API void JS_ReportErrorNumberUTF8(JSContext* cx,
JSErrorCallback errorCallback,
void* userRef,
const unsigned errorNumber, ...) {
va_list ap;
va_start(ap, errorNumber);
JS_ReportErrorNumberUTF8VA(cx, errorCallback, userRef, errorNumber, ap);
va_end(ap);
}
JS_PUBLIC_API void JS_ReportErrorNumberUTF8VA(JSContext* cx,
JSErrorCallback errorCallback,
void* userRef,
const unsigned errorNumber,
va_list ap) {
AssertHeapIsIdle();
ReportErrorNumberVA(cx, IsWarning::No, errorCallback, userRef, errorNumber,
ArgumentsAreUTF8, ap);
}
JS_PUBLIC_API void JS_ReportErrorNumberUTF8Array(JSContext* cx,
JSErrorCallback errorCallback,
void* userRef,
const unsigned errorNumber,
const char** args) {
AssertHeapIsIdle();
ReportErrorNumberUTF8Array(cx, IsWarning::No, errorCallback, userRef,
errorNumber, args);
}
JS_PUBLIC_API void JS_ReportErrorNumberUC(JSContext* cx,
JSErrorCallback errorCallback,
void* userRef,
const unsigned errorNumber, ...) {
va_list ap;
AssertHeapIsIdle();
va_start(ap, errorNumber);
ReportErrorNumberVA(cx, IsWarning::No, errorCallback, userRef, errorNumber,
ArgumentsAreUnicode, ap);
va_end(ap);
}
JS_PUBLIC_API void JS_ReportErrorNumberUCArray(JSContext* cx,
JSErrorCallback errorCallback,
void* userRef,
const unsigned errorNumber,
const char16_t** args) {
AssertHeapIsIdle();
ReportErrorNumberUCArray(cx, IsWarning::No, errorCallback, userRef,
errorNumber, args);
}
JS_PUBLIC_API void JS_ReportOutOfMemory(JSContext* cx) {
ReportOutOfMemory(cx);
}
JS_PUBLIC_API void JS_ReportAllocationOverflow(JSContext* cx) {
ReportAllocationOverflow(cx);
}
JS_PUBLIC_API bool JS_ExpandErrorArgumentsASCII(JSContext* cx,
JSErrorCallback errorCallback,
const unsigned errorNumber,
JSErrorReport* reportp, ...) {
va_list ap;
bool ok;
AssertHeapIsIdle();
va_start(ap, reportp);
AutoReportFrontendContext fc(cx);
ok = ExpandErrorArgumentsVA(&fc, errorCallback, nullptr, errorNumber,
ArgumentsAreASCII, reportp, ap);
va_end(ap);
return ok;
}
/************************************************************************/
JS_PUBLIC_API bool JS_SetDefaultLocale(JSRuntime* rt, const char* locale) {
AssertHeapIsIdle();
return rt->setDefaultLocale(locale);
}
JS_PUBLIC_API UniqueChars JS_GetDefaultLocale(JSContext* cx) {
AssertHeapIsIdle();
if (const char* locale = cx->runtime()->getDefaultLocale()) {
return DuplicateString(cx, locale);
}
return nullptr;
}
JS_PUBLIC_API void JS_ResetDefaultLocale(JSRuntime* rt) {
AssertHeapIsIdle();
rt->resetDefaultLocale();
}
JS_PUBLIC_API void JS_SetLocaleCallbacks(JSRuntime* rt,
const JSLocaleCallbacks* callbacks) {
AssertHeapIsIdle();
rt->localeCallbacks = callbacks;
}
JS_PUBLIC_API const JSLocaleCallbacks* JS_GetLocaleCallbacks(JSRuntime* rt) {
/* This function can be called by a finalizer. */
return rt->localeCallbacks;
}
/************************************************************************/
JS_PUBLIC_API bool JS_IsExceptionPending(JSContext* cx) {
/* This function can be called by a finalizer. */
return (bool)cx->isExceptionPending();
}
JS_PUBLIC_API bool JS_IsThrowingOutOfMemory(JSContext* cx) {
return cx->isThrowingOutOfMemory();
}
JS_PUBLIC_API bool JS_GetPendingException(JSContext* cx,
MutableHandleValue vp) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
if (!cx->isExceptionPending()) {
return false;
}
return cx->getPendingException(vp);
}
JS_PUBLIC_API void JS_SetPendingException(JSContext* cx, HandleValue value,
JS::ExceptionStackBehavior behavior) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
// We don't check the compartment of `value` here, because we're not
// doing anything with it other than storing it, and stored
// exception values can be in an abitrary compartment.
if (behavior == JS::ExceptionStackBehavior::Capture) {
cx->setPendingException(value, ShouldCaptureStack::Always);
} else {
cx->setPendingException(value, nullptr);
}
}
JS_PUBLIC_API void JS_ClearPendingException(JSContext* cx) {
AssertHeapIsIdle();
cx->clearPendingException();
}
JS::AutoSaveExceptionState::AutoSaveExceptionState(JSContext* cx)
: context(cx), status(cx->status), exceptionValue(cx), exceptionStack(cx) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
if (IsCatchableExceptionStatus(status)) {
exceptionValue = cx->unwrappedException();
exceptionStack = cx->unwrappedExceptionStack();
}
cx->clearPendingException();
}
void JS::AutoSaveExceptionState::drop() {
status = JS::ExceptionStatus::None;
exceptionValue.setUndefined();
exceptionStack = nullptr;
}
void JS::AutoSaveExceptionState::restore() {
context->status = status;
context->unwrappedException() = exceptionValue;
if (exceptionStack) {
context->unwrappedExceptionStack() = &exceptionStack->as<SavedFrame>();
}
drop();
}
JS::AutoSaveExceptionState::~AutoSaveExceptionState() {
// NOTE: An interrupt/uncatchable exception or a debugger-forced-return may be
// clobbered here by the saved exception. If that is not desired, this
// state should be dropped before the destructor fires.
if (!context->isExceptionPending()) {
if (status != JS::ExceptionStatus::None) {
context->status = status;
}
if (IsCatchableExceptionStatus(status)) {
context->unwrappedException() = exceptionValue;
if (exceptionStack) {
context->unwrappedExceptionStack() = &exceptionStack->as<SavedFrame>();
}
}
}
}
JS_PUBLIC_API JSErrorReport* JS_ErrorFromException(JSContext* cx,
HandleObject obj) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(obj);
return ErrorFromException(cx, obj);
}
void JSErrorReport::initBorrowedLinebuf(const char16_t* linebufArg,
size_t linebufLengthArg,
size_t tokenOffsetArg) {
MOZ_ASSERT(linebufArg);
MOZ_ASSERT(tokenOffsetArg <= linebufLengthArg);
MOZ_ASSERT(linebufArg[linebufLengthArg] == '\0');
linebuf_ = linebufArg;
linebufLength_ = linebufLengthArg;
tokenOffset_ = tokenOffsetArg;
}
void JSErrorReport::freeLinebuf() {
if (ownsLinebuf_ && linebuf_) {
js_free((void*)linebuf_);
ownsLinebuf_ = false;
}
linebuf_ = nullptr;
}
JSString* JSErrorBase::newMessageString(JSContext* cx) {
if (!message_) {
return cx->runtime()->emptyString;
}
return JS_NewStringCopyUTF8Z(cx, message_);
}
void JSErrorBase::freeMessage() {
if (ownsMessage_) {
js_free((void*)message_.get());
ownsMessage_ = false;
}
message_ = JS::ConstUTF8CharsZ();
}
JSErrorNotes::JSErrorNotes() : notes_() {}
JSErrorNotes::~JSErrorNotes() = default;
static UniquePtr<JSErrorNotes::Note> CreateErrorNoteVA(
FrontendContext* fc, const char* filename, unsigned sourceId,
unsigned lineno, unsigned column, JSErrorCallback errorCallback,
void* userRef, const unsigned errorNumber, ErrorArgumentsType argumentsType,
va_list ap) {
auto note = MakeUnique<JSErrorNotes::Note>();
if (!note) {
ReportOutOfMemory(fc);
return nullptr;
}
note->errorNumber = errorNumber;
note->filename = filename;
note->sourceId = sourceId;
note->lineno = lineno;
note->column = column;
if (!ExpandErrorArgumentsVA(fc, errorCallback, userRef, errorNumber, nullptr,
argumentsType, note.get(), ap)) {
return nullptr;
}
return note;
}
bool JSErrorNotes::addNoteVA(FrontendContext* fc, const char* filename,
unsigned sourceId, unsigned lineno,
unsigned column, JSErrorCallback errorCallback,
void* userRef, const unsigned errorNumber,
ErrorArgumentsType argumentsType, va_list ap) {
auto note =
CreateErrorNoteVA(fc, filename, sourceId, lineno, column, errorCallback,
userRef, errorNumber, argumentsType, ap);
if (!note) {
return false;
}
if (!notes_.append(std::move(note))) {
ReportOutOfMemory(fc);
return false;
}
return true;
}
bool JSErrorNotes::addNoteASCII(JSContext* cx, const char* filename,
unsigned sourceId, unsigned lineno,
unsigned column, JSErrorCallback errorCallback,
void* userRef, const unsigned errorNumber,
...) {
AutoReportFrontendContext fc(cx);
va_list ap;
va_start(ap, errorNumber);
bool ok = addNoteVA(&fc, filename, sourceId, lineno, column, errorCallback,
userRef, errorNumber, ArgumentsAreASCII, ap);
va_end(ap);
return ok;
}
bool JSErrorNotes::addNoteASCII(FrontendContext* fc, const char* filename,
unsigned sourceId, unsigned lineno,
unsigned column, JSErrorCallback errorCallback,
void* userRef, const unsigned errorNumber,
...) {
va_list ap;
va_start(ap, errorNumber);
bool ok = addNoteVA(fc, filename, sourceId, lineno, column, errorCallback,
userRef, errorNumber, ArgumentsAreASCII, ap);
va_end(ap);
return ok;
}
bool JSErrorNotes::addNoteLatin1(JSContext* cx, const char* filename,
unsigned sourceId, unsigned lineno,
unsigned column, JSErrorCallback errorCallback,
void* userRef, const unsigned errorNumber,
...) {
AutoReportFrontendContext fc(cx);
va_list ap;
va_start(ap, errorNumber);
bool ok = addNoteVA(&fc, filename, sourceId, lineno, column, errorCallback,
userRef, errorNumber, ArgumentsAreLatin1, ap);
va_end(ap);
return ok;
}
bool JSErrorNotes::addNoteLatin1(FrontendContext* fc, const char* filename,
unsigned sourceId, unsigned lineno,
unsigned column, JSErrorCallback errorCallback,
void* userRef, const unsigned errorNumber,
...) {
va_list ap;
va_start(ap, errorNumber);
bool ok = addNoteVA(fc, filename, sourceId, lineno, column, errorCallback,
userRef, errorNumber, ArgumentsAreLatin1, ap);
va_end(ap);
return ok;
}
bool JSErrorNotes::addNoteUTF8(JSContext* cx, const char* filename,
unsigned sourceId, unsigned lineno,
unsigned column, JSErrorCallback errorCallback,
void* userRef, const unsigned errorNumber, ...) {
AutoReportFrontendContext fc(cx);
va_list ap;
va_start(ap, errorNumber);
bool ok = addNoteVA(&fc, filename, sourceId, lineno, column, errorCallback,
userRef, errorNumber, ArgumentsAreUTF8, ap);
va_end(ap);
return ok;
}
bool JSErrorNotes::addNoteUTF8(FrontendContext* fc, const char* filename,
unsigned sourceId, unsigned lineno,
unsigned column, JSErrorCallback errorCallback,
void* userRef, const unsigned errorNumber, ...) {
va_list ap;
va_start(ap, errorNumber);
bool ok = addNoteVA(fc, filename, sourceId, lineno, column, errorCallback,
userRef, errorNumber, ArgumentsAreUTF8, ap);
va_end(ap);
return ok;
}
JS_PUBLIC_API size_t JSErrorNotes::length() { return notes_.length(); }
UniquePtr<JSErrorNotes> JSErrorNotes::copy(JSContext* cx) {
auto copiedNotes = MakeUnique<JSErrorNotes>();
if (!copiedNotes) {
ReportOutOfMemory(cx);
return nullptr;
}
for (auto&& note : *this) {
UniquePtr<JSErrorNotes::Note> copied = CopyErrorNote(cx, note.get());
if (!copied) {
return nullptr;
}
if (!copiedNotes->notes_.append(std::move(copied))) {
return nullptr;
}
}
return copiedNotes;
}
JS_PUBLIC_API JSErrorNotes::iterator JSErrorNotes::begin() {
return iterator(notes_.begin());
}
JS_PUBLIC_API JSErrorNotes::iterator JSErrorNotes::end() {
return iterator(notes_.end());
}
extern MOZ_NEVER_INLINE JS_PUBLIC_API void JS_AbortIfWrongThread(
JSContext* cx) {
if (!CurrentThreadCanAccessRuntime(cx->runtime())) {
MOZ_CRASH();
}
if (TlsContext.get() != cx) {
MOZ_CRASH();
}
}
#ifdef JS_GC_ZEAL
JS_PUBLIC_API void JS_GetGCZealBits(JSContext* cx, uint32_t* zealBits,
uint32_t* frequency,
uint32_t* nextScheduled) {
cx->runtime()->gc.getZealBits(zealBits, frequency, nextScheduled);
}
JS_PUBLIC_API void JS_SetGCZeal(JSContext* cx, uint8_t zeal,
uint32_t frequency) {
cx->runtime()->gc.setZeal(zeal, frequency);
}
JS_PUBLIC_API void JS_UnsetGCZeal(JSContext* cx, uint8_t zeal) {
cx->runtime()->gc.unsetZeal(zeal);
}
JS_PUBLIC_API void JS_ScheduleGC(JSContext* cx, uint32_t count) {
cx->runtime()->gc.setNextScheduled(count);
}
#endif
JS_PUBLIC_API void JS_SetParallelParsingEnabled(JSContext* cx, bool enabled) {
cx->runtime()->setParallelParsingEnabled(enabled);
}
JS_PUBLIC_API void JS_SetOffthreadIonCompilationEnabled(JSContext* cx,
bool enabled) {
cx->runtime()->setOffthreadIonCompilationEnabled(enabled);
}
JS_PUBLIC_API void JS_SetGlobalJitCompilerOption(JSContext* cx,
JSJitCompilerOption opt,
uint32_t value) {
JSRuntime* rt = cx->runtime();
switch (opt) {
case JSJITCOMPILER_BASELINE_INTERPRETER_WARMUP_TRIGGER:
if (value == uint32_t(-1)) {
jit::DefaultJitOptions defaultValues;
value = defaultValues.baselineInterpreterWarmUpThreshold;
}
jit::JitOptions.baselineInterpreterWarmUpThreshold = value;
break;
case JSJITCOMPILER_BASELINE_WARMUP_TRIGGER:
if (value == uint32_t(-1)) {
jit::DefaultJitOptions defaultValues;
value = defaultValues.baselineJitWarmUpThreshold;
}
jit::JitOptions.baselineJitWarmUpThreshold = value;
break;
case JSJITCOMPILER_IC_FORCE_MEGAMORPHIC:
jit::JitOptions.forceMegamorphicICs = !!value;
break;
case JSJITCOMPILER_ION_NORMAL_WARMUP_TRIGGER:
if (value == uint32_t(-1)) {
jit::JitOptions.resetNormalIonWarmUpThreshold();
break;
}
jit::JitOptions.setNormalIonWarmUpThreshold(value);
break;
case JSJITCOMPILER_ION_GVN_ENABLE:
if (value == 0) {
jit::JitOptions.enableGvn(false);
JitSpew(js::jit::JitSpew_IonScripts, "Disable ion's GVN");
} else {
jit::JitOptions.enableGvn(true);
JitSpew(js::jit::JitSpew_IonScripts, "Enable ion's GVN");
}
break;
case JSJITCOMPILER_ION_FORCE_IC:
if (value == 0) {
jit::JitOptions.forceInlineCaches = false;
JitSpew(js::jit::JitSpew_IonScripts,
"Ion: Enable non-IC optimizations.");
} else {
jit::JitOptions.forceInlineCaches = true;
JitSpew(js::jit::JitSpew_IonScripts,
"Ion: Disable non-IC optimizations.");
}
break;
case JSJITCOMPILER_ION_CHECK_RANGE_ANALYSIS:
if (value == 0) {
jit::JitOptions.checkRangeAnalysis = false;
JitSpew(js::jit::JitSpew_IonScripts,
"Ion: Enable range analysis checks.");
} else {
jit::JitOptions.checkRangeAnalysis = true;
JitSpew(js::jit::JitSpew_IonScripts,
"Ion: Disable range analysis checks.");
}
break;
case JSJITCOMPILER_ION_ENABLE:
if (value == 1) {
jit::JitOptions.ion = true;
JitSpew(js::jit::JitSpew_IonScripts, "Enable ion");
} else if (value == 0) {
jit::JitOptions.ion = false;
JitSpew(js::jit::JitSpew_IonScripts, "Disable ion");
}
break;
case JSJITCOMPILER_JIT_TRUSTEDPRINCIPALS_ENABLE:
if (value == 1) {
jit::JitOptions.jitForTrustedPrincipals = true;
JitSpew(js::jit::JitSpew_IonScripts,
"Enable ion and baselinejit for trusted principals");
} else if (value == 0) {
jit::JitOptions.jitForTrustedPrincipals = false;
JitSpew(js::jit::JitSpew_IonScripts,
"Disable ion and baselinejit for trusted principals");
}
break;
case JSJITCOMPILER_ION_FREQUENT_BAILOUT_THRESHOLD:
if (value == uint32_t(-1)) {
jit::DefaultJitOptions defaultValues;
value = defaultValues.frequentBailoutThreshold;
}
jit::JitOptions.frequentBailoutThreshold = value;
break;
case JSJITCOMPILER_BASE_REG_FOR_LOCALS:
if (value == 0) {
jit::JitOptions.baseRegForLocals = jit::BaseRegForAddress::SP;
} else if (value == 1) {
jit::JitOptions.baseRegForLocals = jit::BaseRegForAddress::FP;
} else {
jit::DefaultJitOptions defaultValues;
jit::JitOptions.baseRegForLocals = defaultValues.baseRegForLocals;
}
break;
case JSJITCOMPILER_BASELINE_INTERPRETER_ENABLE:
if (value == 1) {
jit::JitOptions.baselineInterpreter = true;
} else if (value == 0) {
ReleaseAllJITCode(rt->gcContext());
jit::JitOptions.baselineInterpreter = false;
}
break;
case JSJITCOMPILER_BASELINE_ENABLE:
if (value == 1) {
jit::JitOptions.baselineJit = true;
ReleaseAllJITCode(rt->gcContext());
JitSpew(js::jit::JitSpew_BaselineScripts, "Enable baseline");
} else if (value == 0) {
jit::JitOptions.baselineJit = false;
ReleaseAllJITCode(rt->gcContext());
JitSpew(js::jit::JitSpew_BaselineScripts, "Disable baseline");
}
break;
case JSJITCOMPILER_NATIVE_REGEXP_ENABLE:
jit::JitOptions.nativeRegExp = !!value;
break;
case JSJITCOMPILER_JIT_HINTS_ENABLE:
jit::JitOptions.disableJitHints = !value;
break;
case JSJITCOMPILER_OFFTHREAD_COMPILATION_ENABLE:
if (value == 1) {
rt->setOffthreadIonCompilationEnabled(true);
JitSpew(js::jit::JitSpew_IonScripts, "Enable offthread compilation");
} else if (value == 0) {
rt->setOffthreadIonCompilationEnabled(false);
JitSpew(js::jit::JitSpew_IonScripts, "Disable offthread compilation");
}
break;
case JSJITCOMPILER_INLINING_BYTECODE_MAX_LENGTH:
if (value == uint32_t(-1)) {
jit::DefaultJitOptions defaultValues;
value = defaultValues.smallFunctionMaxBytecodeLength;
}
jit::JitOptions.smallFunctionMaxBytecodeLength = value;
break;
case JSJITCOMPILER_JUMP_THRESHOLD:
if (value == uint32_t(-1)) {
jit::DefaultJitOptions defaultValues;
value = defaultValues.jumpThreshold;
}
jit::JitOptions.jumpThreshold = value;
break;
case JSJITCOMPILER_SPECTRE_INDEX_MASKING:
jit::JitOptions.spectreIndexMasking = !!value;
break;
case JSJITCOMPILER_SPECTRE_OBJECT_MITIGATIONS:
jit::JitOptions.spectreObjectMitigations = !!value;
break;
case JSJITCOMPILER_SPECTRE_STRING_MITIGATIONS:
jit::JitOptions.spectreStringMitigations = !!value;
break;
case JSJITCOMPILER_SPECTRE_VALUE_MASKING:
jit::JitOptions.spectreValueMasking = !!value;
break;
case JSJITCOMPILER_SPECTRE_JIT_TO_CXX_CALLS:
jit::JitOptions.spectreJitToCxxCalls = !!value;
break;
case JSJITCOMPILER_WATCHTOWER_MEGAMORPHIC:
jit::JitOptions.enableWatchtowerMegamorphic = !!value;
break;
case JSJITCOMPILER_WASM_FOLD_OFFSETS:
jit::JitOptions.wasmFoldOffsets = !!value;
break;
case JSJITCOMPILER_WASM_DELAY_TIER2:
jit::JitOptions.wasmDelayTier2 = !!value;
break;
case JSJITCOMPILER_WASM_JIT_BASELINE:
JS::ContextOptionsRef(cx).setWasmBaseline(!!value);
break;
case JSJITCOMPILER_WASM_JIT_OPTIMIZING:
JS::ContextOptionsRef(cx).setWasmIon(!!value);
break;
#ifdef DEBUG
case JSJITCOMPILER_FULL_DEBUG_CHECKS:
jit::JitOptions.fullDebugChecks = !!value;
break;
#endif
default:
break;
}
}
JS_PUBLIC_API bool JS_GetGlobalJitCompilerOption(JSContext* cx,
JSJitCompilerOption opt,
uint32_t* valueOut) {
MOZ_ASSERT(valueOut);
#ifndef JS_CODEGEN_NONE
JSRuntime* rt = cx->runtime();
switch (opt) {
case JSJITCOMPILER_BASELINE_INTERPRETER_WARMUP_TRIGGER:
*valueOut = jit::JitOptions.baselineInterpreterWarmUpThreshold;
break;
case JSJITCOMPILER_BASELINE_WARMUP_TRIGGER:
*valueOut = jit::JitOptions.baselineJitWarmUpThreshold;
break;
case JSJITCOMPILER_IC_FORCE_MEGAMORPHIC:
*valueOut = jit::JitOptions.forceMegamorphicICs;
break;
case JSJITCOMPILER_ION_NORMAL_WARMUP_TRIGGER:
*valueOut = jit::JitOptions.normalIonWarmUpThreshold;
break;
case JSJITCOMPILER_ION_FORCE_IC:
*valueOut = jit::JitOptions.forceInlineCaches;
break;
case JSJITCOMPILER_ION_CHECK_RANGE_ANALYSIS:
*valueOut = jit::JitOptions.checkRangeAnalysis;
break;
case JSJITCOMPILER_ION_ENABLE:
*valueOut = jit::JitOptions.ion;
break;
case JSJITCOMPILER_ION_FREQUENT_BAILOUT_THRESHOLD:
*valueOut = jit::JitOptions.frequentBailoutThreshold;
break;
case JSJITCOMPILER_BASE_REG_FOR_LOCALS:
*valueOut = uint32_t(jit::JitOptions.baseRegForLocals);
break;
case JSJITCOMPILER_INLINING_BYTECODE_MAX_LENGTH:
*valueOut = jit::JitOptions.smallFunctionMaxBytecodeLength;
break;
case JSJITCOMPILER_BASELINE_INTERPRETER_ENABLE:
*valueOut = jit::JitOptions.baselineInterpreter;
break;
case JSJITCOMPILER_BASELINE_ENABLE:
*valueOut = jit::JitOptions.baselineJit;
break;
case JSJITCOMPILER_NATIVE_REGEXP_ENABLE:
*valueOut = jit::JitOptions.nativeRegExp;
break;
case JSJITCOMPILER_OFFTHREAD_COMPILATION_ENABLE:
*valueOut = rt->canUseOffthreadIonCompilation();
break;
case JSJITCOMPILER_SPECTRE_INDEX_MASKING:
*valueOut = jit::JitOptions.spectreIndexMasking ? 1 : 0;
break;
case JSJITCOMPILER_SPECTRE_OBJECT_MITIGATIONS:
*valueOut = jit::JitOptions.spectreObjectMitigations ? 1 : 0;
break;
case JSJITCOMPILER_SPECTRE_STRING_MITIGATIONS:
*valueOut = jit::JitOptions.spectreStringMitigations ? 1 : 0;
break;
case JSJITCOMPILER_SPECTRE_VALUE_MASKING:
*valueOut = jit::JitOptions.spectreValueMasking ? 1 : 0;
break;
case JSJITCOMPILER_SPECTRE_JIT_TO_CXX_CALLS:
*valueOut = jit::JitOptions.spectreJitToCxxCalls ? 1 : 0;
break;
case JSJITCOMPILER_WATCHTOWER_MEGAMORPHIC:
*valueOut = jit::JitOptions.enableWatchtowerMegamorphic ? 1 : 0;
break;
case JSJITCOMPILER_WASM_FOLD_OFFSETS:
*valueOut = jit::JitOptions.wasmFoldOffsets ? 1 : 0;
break;
case JSJITCOMPILER_WASM_JIT_BASELINE:
*valueOut = JS::ContextOptionsRef(cx).wasmBaseline() ? 1 : 0;
break;
case JSJITCOMPILER_WASM_JIT_OPTIMIZING:
*valueOut = JS::ContextOptionsRef(cx).wasmIon() ? 1 : 0;
break;
# ifdef DEBUG
case JSJITCOMPILER_FULL_DEBUG_CHECKS:
*valueOut = jit::JitOptions.fullDebugChecks ? 1 : 0;
break;
# endif
default:
return false;
}
#else
*valueOut = 0;
#endif
return true;
}
JS_PUBLIC_API void JS::DisableSpectreMitigationsAfterInit() {
// This is used to turn off Spectre mitigations in pre-allocated child
// processes used for isolated web content. Assert there's a single runtime
// and cancel off-thread compilations, to ensure we're not racing with any
// compilations.
JSContext* cx = TlsContext.get();
MOZ_RELEASE_ASSERT(cx);
MOZ_RELEASE_ASSERT(JSRuntime::hasSingleLiveRuntime());
MOZ_RELEASE_ASSERT(cx->runtime()->wasmInstances.lock()->empty());
CancelOffThreadIonCompile(cx->runtime());
jit::JitOptions.spectreIndexMasking = false;
jit::JitOptions.spectreObjectMitigations = false;
jit::JitOptions.spectreStringMitigations = false;
jit::JitOptions.spectreValueMasking = false;
jit::JitOptions.spectreJitToCxxCalls = false;
}
/************************************************************************/
#if !defined(STATIC_EXPORTABLE_JS_API) && !defined(STATIC_JS_API) && \
defined(XP_WIN) && (defined(MOZ_MEMORY) || !defined(JS_STANDALONE))
# include "util/WindowsWrapper.h"
/*
* Initialization routine for the JS DLL.
*/
BOOL WINAPI DllMain(HINSTANCE hDLL, DWORD dwReason, LPVOID lpReserved) {
return TRUE;
}
#endif
JS_PUBLIC_API bool JS_IndexToId(JSContext* cx, uint32_t index,
MutableHandleId id) {
return IndexToId(cx, index, id);
}
JS_PUBLIC_API bool JS_CharsToId(JSContext* cx, JS::TwoByteChars chars,
MutableHandleId idp) {
Rooted<JSAtom*> atom(cx,
AtomizeChars(cx, chars.begin().get(), chars.length()));
if (!atom) {
return false;
}
#ifdef DEBUG
MOZ_ASSERT(!atom->isIndex(), "API misuse: |chars| must not encode an index");
#endif
idp.set(AtomToId(atom));
return true;
}
JS_PUBLIC_API bool JS_IsIdentifier(JSContext* cx, HandleString str,
bool* isIdentifier) {
cx->check(str);
JSLinearString* linearStr = str->ensureLinear(cx);
if (!linearStr) {
return false;
}
*isIdentifier = js::frontend::IsIdentifier(linearStr);
return true;
}
JS_PUBLIC_API bool JS_IsIdentifier(const char16_t* chars, size_t length) {
return js::frontend::IsIdentifier(chars, length);
}
namespace JS {
void AutoFilename::reset() {
if (ss_) {
ss_->Release();
ss_ = nullptr;
}
if (filename_.is<const char*>()) {
filename_.as<const char*>() = nullptr;
} else {
filename_.as<UniqueChars>().reset();
}
}
void AutoFilename::setScriptSource(js::ScriptSource* p) {
MOZ_ASSERT(!ss_);
MOZ_ASSERT(!get());
ss_ = p;
if (p) {
p->AddRef();
setUnowned(p->filename());
}
}
void AutoFilename::setUnowned(const char* filename) {
MOZ_ASSERT(!get());
filename_.as<const char*>() = filename ? filename : "";
}
void AutoFilename::setOwned(UniqueChars&& filename) {
MOZ_ASSERT(!get());
filename_ = AsVariant(std::move(filename));
}
const char* AutoFilename::get() const {
if (filename_.is<const char*>()) {
return filename_.as<const char*>();
}
return filename_.as<UniqueChars>().get();
}
JS_PUBLIC_API bool DescribeScriptedCaller(JSContext* cx, AutoFilename* filename,
unsigned* lineno, unsigned* column) {
if (filename) {
filename->reset();
}
if (lineno) {
*lineno = 0;
}
if (column) {
*column = 0;
}
if (!cx->compartment()) {
return false;
}
NonBuiltinFrameIter i(cx, cx->realm()->principals());
if (i.done()) {
return false;
}
// If the caller is hidden, the embedding wants us to return false here so
// that it can check its own stack (see HideScriptedCaller).
if (i.activation()->scriptedCallerIsHidden()) {
return false;
}
if (filename) {
if (i.isWasm()) {
// For Wasm, copy out the filename, there is no script source.
UniqueChars copy = DuplicateString(i.filename() ? i.filename() : "");
if (!copy) {
filename->setUnowned("out of memory");
} else {
filename->setOwned(std::move(copy));
}
} else {
// All other frames have a script source to read the filename from.
filename->setScriptSource(i.scriptSource());
}
}
if (lineno) {
*lineno = i.computeLine(column);
} else if (column) {
i.computeLine(column);
}
return true;
}
// Fast path to get the activation and realm to use for GetScriptedCallerGlobal.
// If this returns false, the fast path didn't work out and the caller has to
// use the (much slower) NonBuiltinFrameIter path.
//
// The optimization here is that we skip Ion-inlined frames and only look at
// 'outer' frames. That's fine because Ion doesn't inline cross-realm calls.
// However, GetScriptedCallerGlobal has to skip self-hosted frames and Ion
// can inline self-hosted scripts, so we have to be careful:
//
// * When we see a non-self-hosted outer script, it's possible we inlined
// self-hosted scripts into it but that doesn't matter because these scripts
// all have the same realm/global anyway.
//
// * When we see a self-hosted outer script, it's possible we inlined
// non-self-hosted scripts into it, so we have to give up because in this
// case, whether or not to skip the self-hosted frame (to the possibly
// different-realm caller) requires the slow path to handle inlining. Baseline
// and the interpreter don't inline so this only affects Ion.
static bool GetScriptedCallerActivationRealmFast(JSContext* cx,
Activation** activation,
Realm** realm) {
ActivationIterator activationIter(cx);
if (activationIter.done()) {
*activation = nullptr;
*realm = nullptr;
return true;
}
if (activationIter->isJit()) {
jit::JitActivation* act = activationIter->asJit();
JitFrameIter iter(act);
while (true) {
iter.skipNonScriptedJSFrames();
if (iter.done()) {
break;
}
if (!iter.isSelfHostedIgnoringInlining()) {
*activation = act;
*realm = iter.realm();
return true;
}
if (iter.isJSJit() && iter.asJSJit().isIonScripted()) {
// Ion might have inlined non-self-hosted scripts in this
// self-hosted script.
return false;
}
++iter;
}
} else if (activationIter->isInterpreter()) {
InterpreterActivation* act = activationIter->asInterpreter();
for (InterpreterFrameIterator iter(act); !iter.done(); ++iter) {
if (!iter.frame()->script()->selfHosted()) {
*activation = act;
*realm = iter.frame()->script()->realm();
return true;
}
}
}
return false;
}
JS_PUBLIC_API JSObject* GetScriptedCallerGlobal(JSContext* cx) {
Activation* activation;
Realm* realm;
if (GetScriptedCallerActivationRealmFast(cx, &activation, &realm)) {
if (!activation) {
return nullptr;
}
} else {
NonBuiltinFrameIter i(cx);
if (i.done()) {
return nullptr;
}
activation = i.activation();
realm = i.realm();
}
MOZ_ASSERT(realm->compartment() == activation->compartment());
// If the caller is hidden, the embedding wants us to return null here so
// that it can check its own stack (see HideScriptedCaller).
if (activation->scriptedCallerIsHidden()) {
return nullptr;
}
GlobalObject* global = realm->maybeGlobal();
// No one should be running code in a realm without any live objects, so
// there should definitely be a live global.
MOZ_ASSERT(global);
return global;
}
JS_PUBLIC_API void HideScriptedCaller(JSContext* cx) {
MOZ_ASSERT(cx);
// If there's no accessible activation on the stack, we'll return null from
// DescribeScriptedCaller anyway, so there's no need to annotate anything.
Activation* act = cx->activation();
if (!act) {
return;
}
act->hideScriptedCaller();
}
JS_PUBLIC_API void UnhideScriptedCaller(JSContext* cx) {
Activation* act = cx->activation();
if (!act) {
return;
}
act->unhideScriptedCaller();
}
} /* namespace JS */
#ifdef JS_DEBUG
JS_PUBLIC_API void JS::detail::AssertArgumentsAreSane(JSContext* cx,
HandleValue value) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
cx->check(value);
}
#endif /* JS_DEBUG */
JS_PUBLIC_API bool JS::FinishIncrementalEncoding(JSContext* cx,
JS::HandleScript script,
TranscodeBuffer& buffer) {
if (!script) {
return false;
}
if (!script->scriptSource()->xdrFinalizeEncoder(cx, buffer)) {
return false;
}
return true;
}
JS_PUBLIC_API bool JS::FinishIncrementalEncoding(JSContext* cx,
JS::Handle<JSObject*> module,
TranscodeBuffer& buffer) {
if (!module->as<ModuleObject>()
.scriptSourceObject()
->source()
->xdrFinalizeEncoder(cx, buffer)) {
return false;
}
return true;
}
JS_PUBLIC_API void JS::AbortIncrementalEncoding(JS::HandleScript script) {
if (!script) {
return;
}
script->scriptSource()->xdrAbortEncoder();
}
JS_PUBLIC_API void JS::AbortIncrementalEncoding(JS::Handle<JSObject*> module) {
module->as<ModuleObject>().scriptSourceObject()->source()->xdrAbortEncoder();
}
bool JS::IsWasmModuleObject(HandleObject obj) {
return obj->canUnwrapAs<WasmModuleObject>();
}
JS_PUBLIC_API RefPtr<JS::WasmModule> JS::GetWasmModule(HandleObject obj) {
MOZ_ASSERT(JS::IsWasmModuleObject(obj));
WasmModuleObject& mobj = obj->unwrapAs<WasmModuleObject>();
return const_cast<wasm::Module*>(&mobj.module());
}
bool JS::DisableWasmHugeMemory() { return wasm::DisableHugeMemory(); }
JS_PUBLIC_API void JS::SetProcessLargeAllocationFailureCallback(
JS::LargeAllocationFailureCallback lafc) {
MOZ_ASSERT(!OnLargeAllocationFailure);
OnLargeAllocationFailure = lafc;
}
JS_PUBLIC_API void JS::SetOutOfMemoryCallback(JSContext* cx,
OutOfMemoryCallback cb,
void* data) {
cx->runtime()->oomCallback = cb;
cx->runtime()->oomCallbackData = data;
}
JS_PUBLIC_API void JS::SetShadowRealmInitializeGlobalCallback(
JSContext* cx, JS::GlobalInitializeCallback callback) {
cx->runtime()->shadowRealmInitializeGlobalCallback = callback;
}
JS_PUBLIC_API void JS::SetShadowRealmGlobalCreationCallback(
JSContext* cx, JS::GlobalCreationCallback callback) {
cx->runtime()->shadowRealmGlobalCreationCallback = callback;
}
JS::FirstSubsumedFrame::FirstSubsumedFrame(
JSContext* cx, bool ignoreSelfHostedFrames /* = true */)
: JS::FirstSubsumedFrame(cx, cx->realm()->principals(),
ignoreSelfHostedFrames) {}
JS_PUBLIC_API bool JS::CaptureCurrentStack(
JSContext* cx, JS::MutableHandleObject stackp,
JS::StackCapture&& capture /* = JS::StackCapture(JS::AllFrames()) */) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
MOZ_RELEASE_ASSERT(cx->realm());
Realm* realm = cx->realm();
Rooted<SavedFrame*> frame(cx);
if (!realm->savedStacks().saveCurrentStack(cx, &frame, std::move(capture))) {
return false;
}
stackp.set(frame.get());
return true;
}
JS_PUBLIC_API bool JS::IsAsyncStackCaptureEnabledForRealm(JSContext* cx) {
if (!cx->options().asyncStack()) {
return false;
}
if (!cx->options().asyncStackCaptureDebuggeeOnly() ||
cx->realm()->isDebuggee()) {
return true;
}
return cx->realm()->isAsyncStackCapturingEnabled;
}
JS_PUBLIC_API bool JS::CopyAsyncStack(JSContext* cx,
JS::HandleObject asyncStack,
JS::HandleString asyncCause,
JS::MutableHandleObject stackp,
const Maybe<size_t>& maxFrameCount) {
AssertHeapIsIdle();
CHECK_THREAD(cx);
MOZ_RELEASE_ASSERT(cx->realm());
js::AssertObjectIsSavedFrameOrWrapper(cx, asyncStack);
Realm* realm = cx->realm();
Rooted<SavedFrame*> frame(cx);
if (!realm->savedStacks().copyAsyncStack(cx, asyncStack, asyncCause, &frame,
maxFrameCount)) {
return false;
}
stackp.set(frame.get());
return true;
}
JS_PUBLIC_API Zone* JS::GetObjectZone(JSObject* obj) { return obj->zone(); }
JS_PUBLIC_API Zone* JS::GetNurseryCellZone(gc::Cell* cell) {
return cell->nurseryZone();
}
JS_PUBLIC_API JS::TraceKind JS::GCThingTraceKind(void* thing) {
MOZ_ASSERT(thing);
return static_cast<js::gc::Cell*>(thing)->getTraceKind();
}
JS_PUBLIC_API void js::SetStackFormat(JSContext* cx, js::StackFormat format) {
cx->runtime()->setStackFormat(format);
}
JS_PUBLIC_API js::StackFormat js::GetStackFormat(JSContext* cx) {
return cx->runtime()->stackFormat();
}
JS_PUBLIC_API JS::JSTimers JS::GetJSTimers(JSContext* cx) {
return cx->realm()->timers;
}
namespace js {
JS_PUBLIC_API void NoteIntentionalCrash() {
#ifdef __linux__
static bool* addr =
reinterpret_cast<bool*>(dlsym(RTLD_DEFAULT, "gBreakpadInjectorEnabled"));
if (addr) {
*addr = false;
}
#endif
}
#ifdef DEBUG
bool gSupportDifferentialTesting = false;
#endif // DEBUG
} // namespace js
#ifdef DEBUG
JS_PUBLIC_API void JS::SetSupportDifferentialTesting(bool value) {
js::gSupportDifferentialTesting = value;
}
#endif // DEBUG
