/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=8 sts=4 et sw=4 tw=99:
* 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/. */
#ifndef jsfun_h
#define jsfun_h
/*
* JS function definitions.
*/
#include "jsobj.h"
#include "jsscript.h"
#include "jstypes.h"
namespace js {
namespace frontend {
class FunctionBox;
}
class FunctionExtended;
typedef JSNative Native;
} // namespace js
struct JSAtomState;
class JSFunction : public js::NativeObject
{
public:
static const js::Class class_;
enum FunctionKind {
NormalFunction = 0,
Arrow, /* ES6 '(args) => body' syntax */
Method, /* ES6 MethodDefinition */
ClassConstructor,
Getter,
Setter,
AsmJS, /* function is an asm.js module or exported function */
FunctionKindLimit
};
enum Flags {
INTERPRETED = 0x0001, /* function has a JSScript and environment. */
CONSTRUCTOR = 0x0002, /* function that can be called as a constructor */
EXTENDED = 0x0004, /* structure is FunctionExtended */
IS_FUN_PROTO = 0x0008, /* function is Function.prototype for some global object */
EXPR_BODY = 0x0010, /* arrow function with expression body or
* expression closure: function(x) x*x */
HAS_GUESSED_ATOM = 0x0020, /* function had no explicit name, but a
name was guessed for it anyway */
LAMBDA = 0x0040, /* function comes from a FunctionExpression, ArrowFunction, or
Function() call (not a FunctionDeclaration or nonstandard
function-statement) */
SELF_HOSTED = 0x0080, /* function is self-hosted builtin and must not be
decompilable nor constructible. */
HAS_REST = 0x0100, /* function has a rest (...) parameter */
INTERPRETED_LAZY = 0x0200, /* function is interpreted but doesn't have a script yet */
RESOLVED_LENGTH = 0x0400, /* f.length has been resolved (see fun_resolve). */
RESOLVED_NAME = 0x0800, /* f.name has been resolved (see fun_resolve). */
BEING_PARSED = 0x1000, /* function is currently being parsed; has
a funbox in place of an environment */
FUNCTION_KIND_SHIFT = 13,
FUNCTION_KIND_MASK = 0x7 << FUNCTION_KIND_SHIFT,
ASMJS_KIND = AsmJS << FUNCTION_KIND_SHIFT,
ARROW_KIND = Arrow << FUNCTION_KIND_SHIFT,
METHOD_KIND = Method << FUNCTION_KIND_SHIFT,
CLASSCONSTRUCTOR_KIND = ClassConstructor << FUNCTION_KIND_SHIFT,
GETTER_KIND = Getter << FUNCTION_KIND_SHIFT,
SETTER_KIND = Setter << FUNCTION_KIND_SHIFT,
/* Derived Flags values for convenience: */
NATIVE_FUN = 0,
NATIVE_CTOR = NATIVE_FUN | CONSTRUCTOR,
NATIVE_CLASS_CTOR = NATIVE_FUN | CONSTRUCTOR | CLASSCONSTRUCTOR_KIND,
ASMJS_CTOR = ASMJS_KIND | NATIVE_CTOR,
ASMJS_LAMBDA_CTOR = ASMJS_KIND | NATIVE_CTOR | LAMBDA,
INTERPRETED_METHOD = INTERPRETED | METHOD_KIND,
INTERPRETED_METHOD_GENERATOR = INTERPRETED | METHOD_KIND,
INTERPRETED_CLASS_CONSTRUCTOR = INTERPRETED | CLASSCONSTRUCTOR_KIND | CONSTRUCTOR,
INTERPRETED_GETTER = INTERPRETED | GETTER_KIND,
INTERPRETED_SETTER = INTERPRETED | SETTER_KIND,
INTERPRETED_LAMBDA = INTERPRETED | LAMBDA | CONSTRUCTOR,
INTERPRETED_LAMBDA_ARROW = INTERPRETED | LAMBDA | ARROW_KIND,
INTERPRETED_LAMBDA_GENERATOR = INTERPRETED | LAMBDA,
INTERPRETED_NORMAL = INTERPRETED | CONSTRUCTOR,
INTERPRETED_GENERATOR = INTERPRETED,
NO_XDR_FLAGS = RESOLVED_LENGTH | RESOLVED_NAME,
STABLE_ACROSS_CLONES = IS_FUN_PROTO | CONSTRUCTOR | EXPR_BODY | HAS_GUESSED_ATOM |
LAMBDA | SELF_HOSTED | HAS_REST | FUNCTION_KIND_MASK
};
static_assert((INTERPRETED | INTERPRETED_LAZY) == js::JS_FUNCTION_INTERPRETED_BITS,
"jsfriendapi.h's JSFunction::INTERPRETED-alike is wrong");
static_assert(((FunctionKindLimit - 1) << FUNCTION_KIND_SHIFT) <= FUNCTION_KIND_MASK,
"FunctionKind doesn't fit into flags_");
// Implemented in Parser.cpp. Used so the static scope chain may be walked
// in Parser without a JSScript.
class MOZ_STACK_CLASS AutoParseUsingFunctionBox
{
js::RootedFunction fun_;
js::RootedObject oldEnv_;
public:
AutoParseUsingFunctionBox(js::ExclusiveContext* cx, js::frontend::FunctionBox* funbox);
~AutoParseUsingFunctionBox();
};
private:
uint16_t nargs_; /* number of formal arguments
(including defaults and the rest parameter unlike f.length) */
uint16_t flags_; /* bitfield composed of the above Flags enum, as well as the kind */
union U {
class Native {
friend class JSFunction;
js::Native native; /* native method pointer or null */
const JSJitInfo* jitinfo; /* Information about this function to be
used by the JIT;
use the accessor! */
} n;
struct Scripted {
union {
JSScript* script_; /* interpreted bytecode descriptor or null;
use the accessor! */
js::LazyScript* lazy_; /* lazily compiled script, or nullptr */
} s;
union {
JSObject* env_; /* environment for new activations;
use the accessor! */
js::frontend::FunctionBox* funbox_; /* the function box when parsing */
};
} i;
void* nativeOrScript;
} u;
js::HeapPtrAtom atom_; /* name for diagnostics and decompiling */
public:
/* Call objects must be created for each invocation of this function. */
bool needsCallObject() const {
MOZ_ASSERT(!isInterpretedLazy());
MOZ_ASSERT(!isBeingParsed());
if (isNative())
return false;
// Note: this should be kept in sync with FunctionBox::needsCallObject().
return nonLazyScript()->hasAnyAliasedBindings() ||
nonLazyScript()->funHasExtensibleScope() ||
nonLazyScript()->funNeedsDeclEnvObject() ||
nonLazyScript()->needsHomeObject() ||
nonLazyScript()->isDerivedClassConstructor() ||
isGenerator();
}
size_t nargs() const {
return nargs_;
}
uint16_t flags() const {
return flags_;
}
FunctionKind kind() const {
return static_cast<FunctionKind>((flags_ & FUNCTION_KIND_MASK) >> FUNCTION_KIND_SHIFT);
}
/* A function can be classified as either native (C++) or interpreted (JS): */
bool isInterpreted() const { return flags() & (INTERPRETED | INTERPRETED_LAZY); }
bool isNative() const { return !isInterpreted(); }
bool isConstructor() const { return flags() & CONSTRUCTOR; }
/* Possible attributes of a native function: */
bool isAsmJSNative() const { return kind() == AsmJS; }
/* Possible attributes of an interpreted function: */
bool isFunctionPrototype() const { return flags() & IS_FUN_PROTO; }
bool isExprBody() const { return flags() & EXPR_BODY; }
bool hasGuessedAtom() const { return flags() & HAS_GUESSED_ATOM; }
bool isLambda() const { return flags() & LAMBDA; }
bool isSelfHostedBuiltin() const { return flags() & SELF_HOSTED; }
bool hasRest() const { return flags() & HAS_REST; }
bool isInterpretedLazy() const { return flags() & INTERPRETED_LAZY; }
bool hasScript() const { return flags() & INTERPRETED; }
bool isBeingParsed() const { return flags() & BEING_PARSED; }
// Arrow functions store their lexical new.target in the first extended slot.
bool isArrow() const { return kind() == Arrow; }
// Every class-constructor is also a method.
bool isMethod() const { return kind() == Method || kind() == ClassConstructor; }
bool isClassConstructor() const { return kind() == ClassConstructor; }
bool isGetter() const { return kind() == Getter; }
bool isSetter() const { return kind() == Setter; }
bool allowSuperProperty() const {
return isMethod() || isGetter() || isSetter();
}
bool hasResolvedLength() const { return flags() & RESOLVED_LENGTH; }
bool hasResolvedName() const { return flags() & RESOLVED_NAME; }
bool hasJITCode() const {
if (!hasScript())
return false;
return nonLazyScript()->hasBaselineScript() || nonLazyScript()->hasIonScript();
}
/* Compound attributes: */
bool isBuiltin() const {
return (isNative() && !isAsmJSNative()) || isSelfHostedBuiltin();
}
bool isNamedLambda() const {
return isLambda() && displayAtom() && !hasGuessedAtom();
}
bool hasLexicalThis() const {
return isArrow() || nonLazyScript()->isGeneratorExp();
}
bool isBuiltinFunctionConstructor();
/* Returns the strictness of this function, which must be interpreted. */
bool strict() const {
MOZ_ASSERT(isInterpreted());
return isInterpretedLazy() ? lazyScript()->strict() : nonLazyScript()->strict();
}
void setFlags(uint16_t flags) {
this->flags_ = flags;
}
void setKind(FunctionKind kind) {
this->flags_ &= ~FUNCTION_KIND_MASK;
this->flags_ |= static_cast<uint16_t>(kind) << FUNCTION_KIND_SHIFT;
}
// Make the function constructible.
void setIsConstructor() {
MOZ_ASSERT(!isConstructor());
MOZ_ASSERT(isSelfHostedBuiltin());
flags_ |= CONSTRUCTOR;
}
// Can be called multiple times by the parser.
void setArgCount(uint16_t nargs) {
this->nargs_ = nargs;
}
// Can be called multiple times by the parser.
void setHasRest() {
flags_ |= HAS_REST;
}
void setIsSelfHostedBuiltin() {
MOZ_ASSERT(!isSelfHostedBuiltin());
flags_ |= SELF_HOSTED;
// Self-hosted functions should not be constructable.
flags_ &= ~CONSTRUCTOR;
}
void setIsFunctionPrototype() {
MOZ_ASSERT(!isFunctionPrototype());
flags_ |= IS_FUN_PROTO;
}
// Can be called multiple times by the parser.
void setIsExprBody() {
flags_ |= EXPR_BODY;
}
void setArrow() {
setKind(Arrow);
}
void setResolvedLength() {
flags_ |= RESOLVED_LENGTH;
}
void setResolvedName() {
flags_ |= RESOLVED_NAME;
}
JSAtom* atom() const { return hasGuessedAtom() ? nullptr : atom_.get(); }
js::PropertyName* name() const {
return hasGuessedAtom() || !atom_ ? nullptr : atom_->asPropertyName();
}
void initAtom(JSAtom* atom) { atom_.init(atom); }
JSAtom* displayAtom() const {
return atom_;
}
void setGuessedAtom(JSAtom* atom) {
MOZ_ASSERT(!atom_);
MOZ_ASSERT(atom);
MOZ_ASSERT(!hasGuessedAtom());
atom_ = atom;
flags_ |= HAS_GUESSED_ATOM;
}
/* uint16_t representation bounds number of call object dynamic slots. */
enum { MAX_ARGS_AND_VARS = 2 * ((1U << 16) - 1) };
/*
* For an interpreted function, accessors for the initial scope object of
* activations (stack frames) of the function.
*/
JSObject* environment() const {
MOZ_ASSERT(isInterpreted() && !isBeingParsed());
return u.i.env_;
}
void setEnvironment(JSObject* obj) {
MOZ_ASSERT(isInterpreted() && !isBeingParsed());
*reinterpret_cast<js::HeapPtrObject*>(&u.i.env_) = obj;
}
void initEnvironment(JSObject* obj) {
MOZ_ASSERT(isInterpreted() && !isBeingParsed());
reinterpret_cast<js::HeapPtrObject*>(&u.i.env_)->init(obj);
}
void unsetEnvironment() {
setEnvironment(nullptr);
}
private:
void setFunctionBox(js::frontend::FunctionBox* funbox) {
MOZ_ASSERT(isInterpreted());
MOZ_ASSERT_IF(!isBeingParsed(), !environment());
flags_ |= BEING_PARSED;
u.i.funbox_ = funbox;
}
void unsetFunctionBox() {
MOZ_ASSERT(isBeingParsed());
flags_ &= ~BEING_PARSED;
u.i.funbox_ = nullptr;
}
public:
static inline size_t offsetOfNargs() { return offsetof(JSFunction, nargs_); }
static inline size_t offsetOfFlags() { return offsetof(JSFunction, flags_); }
static inline size_t offsetOfEnvironment() { return offsetof(JSFunction, u.i.env_); }
static inline size_t offsetOfAtom() { return offsetof(JSFunction, atom_); }
static bool createScriptForLazilyInterpretedFunction(JSContext* cx, js::HandleFunction fun);
void maybeRelazify(JSRuntime* rt);
// Function Scripts
//
// Interpreted functions may either have an explicit JSScript (hasScript())
// or be lazy with sufficient information to construct the JSScript if
// necessary (isInterpretedLazy()).
//
// A lazy function will have a LazyScript if the function came from parsed
// source, or nullptr if the function is a clone of a self hosted function.
//
// There are several methods to get the script of an interpreted function:
//
// - For all interpreted functions, getOrCreateScript() will get the
// JSScript, delazifying the function if necessary. This is the safest to
// use, but has extra checks, requires a cx and may trigger a GC.
//
// - For inlined functions which may have a LazyScript but whose JSScript
// is known to exist, existingScriptForInlinedFunction() will get the
// script and delazify the function if necessary.
//
// - For functions known to have a JSScript, nonLazyScript() will get it.
JSScript* getOrCreateScript(JSContext* cx) {
MOZ_ASSERT(isInterpreted());
MOZ_ASSERT(cx);
if (isInterpretedLazy()) {
JS::RootedFunction self(cx, this);
if (!createScriptForLazilyInterpretedFunction(cx, self))
return nullptr;
return self->nonLazyScript();
}
return nonLazyScript();
}
JSScript* existingScriptForInlinedFunction() {
MOZ_ASSERT(isInterpreted());
if (isInterpretedLazy()) {
// Get the script from the canonical function. Ion used the
// canonical function to inline the script and because it has
// Baseline code it has not been relazified. Note that we can't
// use lazyScript->script_ here as it may be null in some cases,
// see bug 976536.
js::LazyScript* lazy = lazyScript();
JSFunction* fun = lazy->functionNonDelazifying();
MOZ_ASSERT(fun);
JSScript* script = fun->nonLazyScript();
if (shadowZone()->needsIncrementalBarrier())
js::LazyScript::writeBarrierPre(lazy);
flags_ &= ~INTERPRETED_LAZY;
flags_ |= INTERPRETED;
initScript(script);
}
return nonLazyScript();
}
// The state of a JSFunction whose script errored out during bytecode
// compilation. Such JSFunctions are only reachable via GC iteration and
// not from script.
bool hasUncompiledScript() const {
MOZ_ASSERT(hasScript());
return !u.i.s.script_;
}
JSScript* nonLazyScript() const {
MOZ_ASSERT(!hasUncompiledScript());
return u.i.s.script_;
}
bool getLength(JSContext* cx, uint16_t* length) {
JS::RootedFunction self(cx, this);
if (self->isInterpretedLazy() && !self->getOrCreateScript(cx))
return false;
*length = self->hasScript() ? self->nonLazyScript()->funLength()
: (self->nargs() - self->hasRest());
return true;
}
js::LazyScript* lazyScript() const {
MOZ_ASSERT(isInterpretedLazy() && u.i.s.lazy_);
return u.i.s.lazy_;
}
js::LazyScript* lazyScriptOrNull() const {
MOZ_ASSERT(isInterpretedLazy());
return u.i.s.lazy_;
}
js::frontend::FunctionBox* functionBox() const {
MOZ_ASSERT(isBeingParsed());
return u.i.funbox_;
}
js::GeneratorKind generatorKind() const {
if (!isInterpreted())
return js::NotGenerator;
if (hasScript())
return nonLazyScript()->generatorKind();
if (js::LazyScript* lazy = lazyScriptOrNull())
return lazy->generatorKind();
MOZ_ASSERT(isSelfHostedBuiltin());
return js::NotGenerator;
}
bool isGenerator() const { return generatorKind() != js::NotGenerator; }
bool isLegacyGenerator() const { return generatorKind() == js::LegacyGenerator; }
bool isStarGenerator() const { return generatorKind() == js::StarGenerator; }
void setScript(JSScript* script_) {
mutableScript() = script_;
}
void initScript(JSScript* script_) {
mutableScript().init(script_);
}
void setUnlazifiedScript(JSScript* script) {
// Note: createScriptForLazilyInterpretedFunction triggers a barrier on
// lazy script before it is overwritten here.
MOZ_ASSERT(isInterpretedLazy());
if (lazyScriptOrNull() && !lazyScript()->maybeScript())
lazyScript()->initScript(script);
flags_ &= ~INTERPRETED_LAZY;
flags_ |= INTERPRETED;
initScript(script);
}
void initLazyScript(js::LazyScript* lazy) {
MOZ_ASSERT(isInterpreted());
flags_ &= ~INTERPRETED;
flags_ |= INTERPRETED_LAZY;
u.i.s.lazy_ = lazy;
}
JSNative native() const {
MOZ_ASSERT(isNative());
return u.n.native;
}
JSNative maybeNative() const {
return isInterpreted() ? nullptr : native();
}
void initNative(js::Native native, const JSJitInfo* jitinfo) {
MOZ_ASSERT(native);
u.n.native = native;
u.n.jitinfo = jitinfo;
}
const JSJitInfo* jitInfo() const {
MOZ_ASSERT(isNative());
return u.n.jitinfo;
}
void setJitInfo(const JSJitInfo* data) {
MOZ_ASSERT(isNative());
u.n.jitinfo = data;
}
bool isDerivedClassConstructor() {
bool derived;
if (isInterpretedLazy())
derived = !isSelfHostedBuiltin() && lazyScript()->isDerivedClassConstructor();
else
derived = nonLazyScript()->isDerivedClassConstructor();
MOZ_ASSERT_IF(derived, isClassConstructor());
return derived;
}
static unsigned offsetOfNativeOrScript() {
static_assert(offsetof(U, n.native) == offsetof(U, i.s.script_),
"native and script pointers must be in the same spot "
"for offsetOfNativeOrScript() have any sense");
static_assert(offsetof(U, n.native) == offsetof(U, nativeOrScript),
"U::nativeOrScript must be at the same offset as "
"native");
return offsetof(JSFunction, u.nativeOrScript);
}
inline void trace(JSTracer* trc);
/* Bound function accessors. */
inline bool initBoundFunction(JSContext* cx, js::HandleObject target, js::HandleValue thisArg,
const js::Value* args, unsigned argslen);
JSObject* getBoundFunctionTarget() const;
const js::Value& getBoundFunctionThis() const;
const js::Value& getBoundFunctionArgument(unsigned which) const;
size_t getBoundFunctionArgumentCount() const;
private:
js::HeapPtrScript& mutableScript() {
MOZ_ASSERT(hasScript());
return *(js::HeapPtrScript*)&u.i.s.script_;
}
inline js::FunctionExtended* toExtended();
inline const js::FunctionExtended* toExtended() const;
public:
inline bool isExtended() const {
bool extended = !!(flags() & EXTENDED);
MOZ_ASSERT_IF(isTenured(),
extended == (asTenured().getAllocKind() == js::gc::AllocKind::FUNCTION_EXTENDED));
return extended;
}
/*
* Accessors for data stored in extended functions. Use setExtendedSlot if
* the function has already been initialized. Otherwise use
* initExtendedSlot.
*/
inline void initializeExtended();
inline void initExtendedSlot(size_t which, const js::Value& val);
inline void setExtendedSlot(size_t which, const js::Value& val);
inline const js::Value& getExtendedSlot(size_t which) const;
/* Constructs a new type for the function if necessary. */
static bool setTypeForScriptedFunction(js::ExclusiveContext* cx, js::HandleFunction fun,
bool singleton = false);
/* GC support. */
js::gc::AllocKind getAllocKind() const {
static_assert(js::gc::AllocKind::FUNCTION != js::gc::AllocKind::FUNCTION_EXTENDED,
"extended/non-extended AllocKinds have to be different "
"for getAllocKind() to have a reason to exist");
js::gc::AllocKind kind = js::gc::AllocKind::FUNCTION;
if (isExtended())
kind = js::gc::AllocKind::FUNCTION_EXTENDED;
MOZ_ASSERT_IF(isTenured(), kind == asTenured().getAllocKind());
return kind;
}
};
static_assert(sizeof(JSFunction) == sizeof(js::shadow::Function),
"shadow interface must match actual interface");
extern JSString*
fun_toStringHelper(JSContext* cx, js::HandleObject obj, unsigned indent);
namespace js {
extern bool
Function(JSContext* cx, unsigned argc, Value* vp);
extern bool
Generator(JSContext* cx, unsigned argc, Value* vp);
// Allocate a new function backed by a JSNative.
extern JSFunction*
NewNativeFunction(ExclusiveContext* cx, JSNative native, unsigned nargs, HandleAtom atom,
gc::AllocKind allocKind = gc::AllocKind::FUNCTION,
NewObjectKind newKind = GenericObject);
// Allocate a new constructor backed by a JSNative.
extern JSFunction*
NewNativeConstructor(ExclusiveContext* cx, JSNative native, unsigned nargs, HandleAtom atom,
gc::AllocKind allocKind = gc::AllocKind::FUNCTION,
NewObjectKind newKind = GenericObject,
JSFunction::Flags flags = JSFunction::NATIVE_CTOR);
// Allocate a new scripted function. If enclosingDynamicScope is null, the
// global will be used. In all cases the parent of the resulting object will be
// the global.
extern JSFunction*
NewScriptedFunction(ExclusiveContext* cx, unsigned nargs, JSFunction::Flags flags,
HandleAtom atom, gc::AllocKind allocKind = gc::AllocKind::FUNCTION,
NewObjectKind newKind = GenericObject,
HandleObject enclosingDynamicScope = nullptr);
// By default, if proto is nullptr, Function.prototype is used instead.i
// If protoHandling is NewFunctionExactProto, and proto is nullptr, the created
// function will use nullptr as its [[Prototype]] instead. If
// enclosingDynamicScope is null, the function will have a null environment()
// (yes, null, not the global). In all cases, the global will be used as the
// parent.
enum NewFunctionProtoHandling {
NewFunctionClassProto,
NewFunctionGivenProto
};
extern JSFunction*
NewFunctionWithProto(ExclusiveContext* cx, JSNative native, unsigned nargs,
JSFunction::Flags flags, HandleObject enclosingDynamicScope, HandleAtom atom,
HandleObject proto, gc::AllocKind allocKind = gc::AllocKind::FUNCTION,
NewObjectKind newKind = GenericObject,
NewFunctionProtoHandling protoHandling = NewFunctionClassProto);
extern JSAtom*
IdToFunctionName(JSContext* cx, HandleId id);
extern JSFunction*
DefineFunction(JSContext* cx, HandleObject obj, HandleId id, JSNative native,
unsigned nargs, unsigned flags,
gc::AllocKind allocKind = gc::AllocKind::FUNCTION);
bool
FunctionHasResolveHook(const JSAtomState& atomState, jsid id);
extern bool
fun_toString(JSContext* cx, unsigned argc, Value* vp);
extern bool
fun_bind(JSContext* cx, unsigned argc, Value* vp);
/*
* Function extended with reserved slots for use by various kinds of functions.
* Most functions do not have these extensions, but enough do that efficient
* storage is required (no malloc'ed reserved slots).
*/
class FunctionExtended : public JSFunction
{
public:
static const unsigned NUM_EXTENDED_SLOTS = 2;
/* Arrow functions store their lexical new.target in the first extended slot. */
static const unsigned ARROW_NEWTARGET_SLOT = 0;
static const unsigned METHOD_HOMEOBJECT_SLOT = 0;
static inline size_t offsetOfExtendedSlot(unsigned which) {
MOZ_ASSERT(which < NUM_EXTENDED_SLOTS);
return offsetof(FunctionExtended, extendedSlots) + which * sizeof(HeapValue);
}
static inline size_t offsetOfArrowNewTargetSlot() {
return offsetOfExtendedSlot(ARROW_NEWTARGET_SLOT);
}
private:
friend class JSFunction;
/* Reserved slots available for storage by particular native functions. */
HeapValue extendedSlots[NUM_EXTENDED_SLOTS];
};
extern bool
CanReuseScriptForClone(JSCompartment* compartment, HandleFunction fun, HandleObject newParent);
extern JSFunction*
CloneFunctionReuseScript(JSContext* cx, HandleFunction fun, HandleObject parent,
gc::AllocKind kind = gc::AllocKind::FUNCTION,
NewObjectKind newKindArg = GenericObject,
HandleObject proto = nullptr);
// Functions whose scripts are cloned are always given singleton types.
extern JSFunction*
CloneFunctionAndScript(JSContext* cx, HandleFunction fun, HandleObject parent,
HandleObject newStaticScope,
gc::AllocKind kind = gc::AllocKind::FUNCTION,
HandleObject proto = nullptr);
extern bool
FindBody(JSContext* cx, HandleFunction fun, HandleLinearString src, size_t* bodyStart,
size_t* bodyEnd);
} // namespace js
inline js::FunctionExtended*
JSFunction::toExtended()
{
MOZ_ASSERT(isExtended());
return static_cast<js::FunctionExtended*>(this);
}
inline const js::FunctionExtended*
JSFunction::toExtended() const
{
MOZ_ASSERT(isExtended());
return static_cast<const js::FunctionExtended*>(this);
}
inline void
JSFunction::initializeExtended()
{
MOZ_ASSERT(isExtended());
MOZ_ASSERT(mozilla::ArrayLength(toExtended()->extendedSlots) == 2);
toExtended()->extendedSlots[0].init(js::UndefinedValue());
toExtended()->extendedSlots[1].init(js::UndefinedValue());
}
inline void
JSFunction::initExtendedSlot(size_t which, const js::Value& val)
{
MOZ_ASSERT(which < mozilla::ArrayLength(toExtended()->extendedSlots));
toExtended()->extendedSlots[which].init(val);
}
inline void
JSFunction::setExtendedSlot(size_t which, const js::Value& val)
{
MOZ_ASSERT(which < mozilla::ArrayLength(toExtended()->extendedSlots));
toExtended()->extendedSlots[which] = val;
}
inline const js::Value&
JSFunction::getExtendedSlot(size_t which) const
{
MOZ_ASSERT(which < mozilla::ArrayLength(toExtended()->extendedSlots));
return toExtended()->extendedSlots[which];
}
namespace js {
JSString* FunctionToString(JSContext* cx, HandleFunction fun, bool lambdaParen);
template<XDRMode mode>
bool
XDRInterpretedFunction(XDRState<mode>* xdr, HandleObject enclosingScope,
HandleScript enclosingScript, MutableHandleFunction objp);
/*
* Report an error that call.thisv is not compatible with the specified class,
* assuming that the method (clasp->name).prototype.<name of callee function>
* is what was called.
*/
extern void
ReportIncompatibleMethod(JSContext* cx, CallReceiver call, const Class* clasp);
/*
* Report an error that call.thisv is not an acceptable this for the callee
* function.
*/
extern void
ReportIncompatible(JSContext* cx, CallReceiver call);
bool
CallOrConstructBoundFunction(JSContext*, unsigned, js::Value*);
extern const JSFunctionSpec function_methods[];
extern bool
fun_apply(JSContext* cx, unsigned argc, Value* vp);
extern bool
fun_call(JSContext* cx, unsigned argc, Value* vp);
} /* namespace js */
#ifdef DEBUG
namespace JS {
namespace detail {
JS_PUBLIC_API(void)
CheckIsValidConstructible(Value calleev);
} // namespace detail
} // namespace JS
#endif
#endif /* jsfun_h */