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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef vm_Interpreter_h
#define vm_Interpreter_h
/*
* JS interpreter interface.
*/
#include "jspubtd.h"
#include "vm/BuiltinObjectKind.h"
#include "vm/CheckIsObjectKind.h" // CheckIsObjectKind
#include "vm/Iteration.h"
#include "vm/Stack.h"
namespace js {
class EnvironmentIter;
class PlainObject;
/*
* Convert null/undefined |thisv| into the global lexical's |this| object, and
* replace other primitives with boxed versions.
*/
extern JSObject* BoxNonStrictThis(JSContext* cx, HandleValue thisv);
extern bool GetFunctionThis(JSContext* cx, AbstractFramePtr frame,
MutableHandleValue res);
extern void GetNonSyntacticGlobalThis(JSContext* cx, HandleObject envChain,
MutableHandleValue res);
/*
* numToSkip is the number of stack values the expression decompiler should skip
* before it reaches |v|. If it's -1, the decompiler will search the stack.
*/
extern bool ReportIsNotFunction(JSContext* cx, HandleValue v, int numToSkip,
MaybeConstruct construct = NO_CONSTRUCT);
/* See ReportIsNotFunction comment for the meaning of numToSkip. */
extern JSObject* ValueToCallable(JSContext* cx, HandleValue v,
int numToSkip = -1,
MaybeConstruct construct = NO_CONSTRUCT);
// Reasons why a call could be performed, for passing onto the debugger.
enum class CallReason { Call, Getter, Setter };
/*
* Call or construct arguments that are stored in rooted memory.
*
* NOTE: Any necessary |GetThisValue| computation must have been performed on
* |args.thisv()|, likely by the interpreter when pushing |this| onto the
* stack. If you're not sure whether |GetThisValue| processing has been
* performed, use |Invoke|.
*/
extern bool InternalCallOrConstruct(JSContext* cx, const CallArgs& args,
MaybeConstruct construct,
CallReason reason = CallReason::Call);
/*
* These helpers take care of the infinite-recursion check necessary for
* getter/setter calls.
*/
extern bool CallGetter(JSContext* cx, HandleValue thisv, HandleValue getter,
MutableHandleValue rval);
extern bool CallSetter(JSContext* cx, HandleValue thisv, HandleValue setter,
HandleValue rval);
// ES7 rev 0c1bd3004329336774cbc90de727cd0cf5f11e93
// 7.3.12 Call(F, V, argumentsList).
// All parameters are required, hopefully forcing callers to be careful not to
// (say) blindly pass callee as |newTarget| when a different value should have
// been passed. Behavior is unspecified if any element of |args| isn't
// initialized.
//
// |rval| is written to *only* after |fval| and |thisv| have been consumed, so
// |rval| *may* alias either argument.
extern bool Call(JSContext* cx, HandleValue fval, HandleValue thisv,
const AnyInvokeArgs& args, MutableHandleValue rval,
CallReason reason = CallReason::Call);
inline bool Call(JSContext* cx, HandleValue fval, HandleValue thisv,
MutableHandleValue rval) {
FixedInvokeArgs<0> args(cx);
return Call(cx, fval, thisv, args, rval);
}
inline bool Call(JSContext* cx, HandleValue fval, JSObject* thisObj,
MutableHandleValue rval) {
RootedValue thisv(cx, ObjectOrNullValue(thisObj));
FixedInvokeArgs<0> args(cx);
return Call(cx, fval, thisv, args, rval);
}
inline bool Call(JSContext* cx, HandleValue fval, HandleValue thisv,
HandleValue arg0, MutableHandleValue rval) {
FixedInvokeArgs<1> args(cx);
args[0].set(arg0);
return Call(cx, fval, thisv, args, rval);
}
inline bool Call(JSContext* cx, HandleValue fval, JSObject* thisObj,
HandleValue arg0, MutableHandleValue rval) {
RootedValue thisv(cx, ObjectOrNullValue(thisObj));
FixedInvokeArgs<1> args(cx);
args[0].set(arg0);
return Call(cx, fval, thisv, args, rval);
}
inline bool Call(JSContext* cx, HandleValue fval, HandleValue thisv,
HandleValue arg0, HandleValue arg1, MutableHandleValue rval) {
FixedInvokeArgs<2> args(cx);
args[0].set(arg0);
args[1].set(arg1);
return Call(cx, fval, thisv, args, rval);
}
inline bool Call(JSContext* cx, HandleValue fval, JSObject* thisObj,
HandleValue arg0, HandleValue arg1, MutableHandleValue rval) {
RootedValue thisv(cx, ObjectOrNullValue(thisObj));
FixedInvokeArgs<2> args(cx);
args[0].set(arg0);
args[1].set(arg1);
return Call(cx, fval, thisv, args, rval);
}
// Perform the above Call() operation using the given arguments. Similar to
// ConstructFromStack() below, this handles |!IsCallable(args.calleev())|.
//
// This internal operation is intended only for use with arguments known to be
// on the JS stack, or at least in carefully-rooted memory. The vast majority of
// potential users should instead use InvokeArgs in concert with Call().
extern bool CallFromStack(JSContext* cx, const CallArgs& args);
// ES6 7.3.13 Construct(F, argumentsList, newTarget). All parameters are
// required, hopefully forcing callers to be careful not to (say) blindly pass
// callee as |newTarget| when a different value should have been passed.
// Behavior is unspecified if any element of |args| isn't initialized.
//
// |rval| is written to *only* after |fval| and |newTarget| have been consumed,
// so |rval| *may* alias either argument.
//
// NOTE: As with the ES6 spec operation, it's the caller's responsibility to
// ensure |fval| and |newTarget| are both |IsConstructor|.
extern bool Construct(JSContext* cx, HandleValue fval,
const AnyConstructArgs& args, HandleValue newTarget,
MutableHandleObject objp);
// Check that in the given |args|, which must be |args.isConstructing()|, that
// |IsConstructor(args.callee())|. If this is not the case, throw a TypeError.
// Otherwise, the user must ensure that, additionally,
// |IsConstructor(args.newTarget())|. (If |args| comes directly from the
// interpreter stack, as set up by JSOp::New, this comes for free.) Then perform
// a Construct() operation using |args|.
//
// This internal operation is intended only for use with arguments known to be
// on the JS stack, or at least in carefully-rooted memory. The vast majority of
// potential users should instead use ConstructArgs in concert with Construct().
extern bool ConstructFromStack(JSContext* cx, const CallArgs& args);
// Call Construct(fval, args, newTarget), but use the given |thisv| as |this|
// during construction of |fval|.
//
// |rval| is written to *only* after |fval|, |thisv|, and |newTarget| have been
// consumed, so |rval| *may* alias any of these arguments.
//
// This method exists only for very rare cases where a |this| was created
// caller-side for construction of |fval|: basically only for JITs using
// |CreateThis|. If that's not you, use Construct()!
extern bool InternalConstructWithProvidedThis(JSContext* cx, HandleValue fval,
HandleValue thisv,
const AnyConstructArgs& args,
HandleValue newTarget,
MutableHandleValue rval);
/*
* Executes a script with the given envChain. To support debugging, the
* evalInFrame parameter can point to an arbitrary frame in the context's call
* stack to simulate executing an eval in that frame.
*/
extern bool ExecuteKernel(JSContext* cx, HandleScript script,
HandleObject envChainArg, HandleValue newTargetValue,
AbstractFramePtr evalInFrame,
MutableHandleValue result);
/* Execute a script with the given envChain as global code. */
extern bool Execute(JSContext* cx, HandleScript script, HandleObject envChain,
MutableHandleValue rval);
class ExecuteState;
class InvokeState;
// RunState is passed to RunScript and RunScript then either passes it to the
// interpreter or to the JITs. RunState contains all information we need to
// construct an interpreter or JIT frame.
class MOZ_RAII RunState {
protected:
enum Kind { Execute, Invoke };
Kind kind_;
RootedScript script_;
explicit RunState(JSContext* cx, Kind kind, JSScript* script)
: kind_(kind), script_(cx, script) {}
public:
bool isExecute() const { return kind_ == Execute; }
bool isInvoke() const { return kind_ == Invoke; }
ExecuteState* asExecute() const {
MOZ_ASSERT(isExecute());
return (ExecuteState*)this;
}
InvokeState* asInvoke() const {
MOZ_ASSERT(isInvoke());
return (InvokeState*)this;
}
JS::HandleScript script() const { return script_; }
InterpreterFrame* pushInterpreterFrame(JSContext* cx);
inline void setReturnValue(const Value& v);
private:
RunState(const RunState& other) = delete;
RunState(const ExecuteState& other) = delete;
RunState(const InvokeState& other) = delete;
void operator=(const RunState& other) = delete;
};
// Eval or global script.
class MOZ_RAII ExecuteState : public RunState {
RootedValue newTargetValue_;
HandleObject envChain_;
AbstractFramePtr evalInFrame_;
MutableHandleValue result_;
public:
ExecuteState(JSContext* cx, JSScript* script, HandleValue newTargetValue,
HandleObject envChain, AbstractFramePtr evalInFrame,
MutableHandleValue result)
: RunState(cx, Execute, script),
newTargetValue_(cx, newTargetValue),
envChain_(envChain),
evalInFrame_(evalInFrame),
result_(result) {}
Value newTarget() const { return newTargetValue_; }
Value* addressOfNewTarget() { return newTargetValue_.address(); }
JSObject* environmentChain() const { return envChain_; }
bool isDebuggerEval() const { return !!evalInFrame_; }
InterpreterFrame* pushInterpreterFrame(JSContext* cx);
void setReturnValue(const Value& v) { result_.set(v); }
};
// Data to invoke a function.
class MOZ_RAII InvokeState final : public RunState {
const CallArgs& args_;
MaybeConstruct construct_;
public:
InvokeState(JSContext* cx, const CallArgs& args, MaybeConstruct construct)
: RunState(cx, Invoke, args.callee().as<JSFunction>().nonLazyScript()),
args_(args),
construct_(construct) {}
bool constructing() const { return construct_; }
const CallArgs& args() const { return args_; }
InterpreterFrame* pushInterpreterFrame(JSContext* cx);
void setReturnValue(const Value& v) { args_.rval().set(v); }
};
inline void RunState::setReturnValue(const Value& v) {
if (isInvoke()) {
asInvoke()->setReturnValue(v);
} else {
asExecute()->setReturnValue(v);
}
}
extern bool RunScript(JSContext* cx, RunState& state);
extern JSType TypeOfObject(JSObject* obj);
extern JSType TypeOfValue(const Value& v);
extern bool HasInstance(JSContext* cx, HandleObject obj, HandleValue v,
bool* bp);
// Unwind environment chain and iterator to match the scope corresponding to
// the given bytecode position.
extern void UnwindEnvironment(JSContext* cx, EnvironmentIter& ei,
jsbytecode* pc);
// Unwind all environments.
extern void UnwindAllEnvironmentsInFrame(JSContext* cx, EnvironmentIter& ei);
// Compute the pc needed to unwind the scope to the beginning of the block
// pointed to by the try note.
extern jsbytecode* UnwindEnvironmentToTryPc(JSScript* script,
const TryNote* tn);
namespace detail {
template <class TryNoteFilter>
class MOZ_STACK_CLASS BaseTryNoteIter {
uint32_t pcOffset_;
TryNoteFilter isTryNoteValid_;
const TryNote* tn_;
const TryNote* tnEnd_;
void settle() {
for (; tn_ != tnEnd_; ++tn_) {
if (!pcInRange()) {
continue;
}
/* Try notes cannot be disjoint. That is, we can't have
* multiple notes with disjoint pc ranges jumping to the same
* catch block. This interacts awkwardly with for-of loops, in
* which calls to IteratorClose emitted due to abnormal
* completion (break, throw, return) are emitted inline, at the
* source location of the break, throw, or return
* statement. For example:
*
* for (x of iter) {
* try { return; } catch (e) { }
* }
*
* From the try-note nesting's perspective, the IteratorClose
* resulting from |return| is covered by the inner try, when it
* should not be. If IteratorClose throws, we don't want to
* catch it here.
*
* To make this work, we use TryNoteKind::ForOfIterClose try-notes,
* which cover the range of the abnormal completion. When
* looking up trynotes, a for-of iterclose note indicates that
* the enclosing for-of has just been terminated. As a result,
* trynotes within that for-of are no longer active. When we
* see a for-of-iterclose, we skip ahead in the trynotes list
* until we see the matching for-of.
*
* Breaking out of multiple levels of for-of at once is handled
* using nested FOR_OF_ITERCLOSE try-notes. Consider this code:
*
* try {
* loop: for (i of first) {
* <A>
* for (j of second) {
* <B>
* break loop; // <C1/2>
* }
* }
* } catch {...}
*
* Here is the mapping from various PCs to try-notes that we
* want to return:
*
* A B C1 C2
* | | | |
* | | | [---|---] ForOfIterClose (outer)
* | | [---|------|---] ForOfIterClose (inner)
* | [--X-----|------|----] ForOf (inner)
* [---X-----------X------|-----] ForOf (outer)
* [------------------------X------] TryCatch
*
* - At A, we find the outer for-of.
* - At B, we find the inner for-of.
* - At C1, we find one FOR_OF_ITERCLOSE, skip past one FOR_OF, and find
* the outer for-of. (This occurs if an exception is thrown while
* closing the inner iterator.)
* - At C2, we find two FOR_OF_ITERCLOSE, skip past two FOR_OF, and reach
* the outer try-catch. (This occurs if an exception is thrown while
* closing the outer iterator.)
*/
if (tn_->kind() == TryNoteKind::ForOfIterClose) {
uint32_t iterCloseDepth = 1;
do {
++tn_;
MOZ_ASSERT(tn_ != tnEnd_);
if (pcInRange()) {
if (tn_->kind() == TryNoteKind::ForOfIterClose) {
iterCloseDepth++;
} else if (tn_->kind() == TryNoteKind::ForOf) {
iterCloseDepth--;
}
}
} while (iterCloseDepth > 0);
// Advance to trynote following the enclosing for-of.
continue;
}
/*
* We have a note that covers the exception pc but we must check
* whether the interpreter has already executed the corresponding
* handler. This is possible when the executed bytecode implements
* break or return from inside a for-in loop.
*
* In this case the emitter generates additional [enditer] and [gosub]
* opcodes to close all outstanding iterators and execute the finally
* blocks. If such an [enditer] throws an exception, its pc can still
* be inside several nested for-in loops and try-finally statements
* even if we have already closed the corresponding iterators and
* invoked the finally blocks.
*
* To address this, we make [enditer] always decrease the stack even
* when its implementation throws an exception. Thus already executed
* [enditer] and [gosub] opcodes will have try notes with the stack
* depth exceeding the current one and this condition is what we use to
* filter them out.
*/
if (tn_ == tnEnd_ || isTryNoteValid_(tn_)) {
return;
}
}
}
public:
BaseTryNoteIter(JSScript* script, jsbytecode* pc,
TryNoteFilter isTryNoteValid)
: pcOffset_(script->pcToOffset(pc)), isTryNoteValid_(isTryNoteValid) {
// NOTE: The Span is a temporary so we can't use begin()/end()
// here or the iterator will outlive the span.
auto trynotes = script->trynotes();
tn_ = trynotes.data();
tnEnd_ = tn_ + trynotes.size();
settle();
}
void operator++() {
++tn_;
settle();
}
bool pcInRange() const {
// This checks both ends of the range at once
// because unsigned integers wrap on underflow.
uint32_t offset = pcOffset_;
uint32_t start = tn_->start;
uint32_t length = tn_->length;
return offset - start < length;
}
bool done() const { return tn_ == tnEnd_; }
const TryNote* operator*() const { return tn_; }
};
} // namespace detail
template <class TryNoteFilter>
class MOZ_STACK_CLASS TryNoteIter
: public detail::BaseTryNoteIter<TryNoteFilter> {
using Base = detail::BaseTryNoteIter<TryNoteFilter>;
// Keep the script alive as long as the iterator is live.
RootedScript script_;
public:
TryNoteIter(JSContext* cx, JSScript* script, jsbytecode* pc,
TryNoteFilter isTryNoteValid)
: Base(script, pc, isTryNoteValid), script_(cx, script) {}
};
class NoOpTryNoteFilter {
public:
explicit NoOpTryNoteFilter() = default;
bool operator()(const TryNote*) { return true; }
};
// Iterator over all try notes. Code using this iterator is not allowed to
// trigger GC to make sure the script stays alive. See TryNoteIter above for the
// can-GC version.
class MOZ_STACK_CLASS TryNoteIterAllNoGC
: public detail::BaseTryNoteIter<NoOpTryNoteFilter> {
using Base = detail::BaseTryNoteIter<NoOpTryNoteFilter>;
JS::AutoCheckCannotGC nogc;
public:
TryNoteIterAllNoGC(JSScript* script, jsbytecode* pc)
: Base(script, pc, NoOpTryNoteFilter()) {}
};
bool HandleClosingGeneratorReturn(JSContext* cx, AbstractFramePtr frame,
bool ok);
/************************************************************************/
bool ThrowOperation(JSContext* cx, HandleValue v);
bool GetProperty(JSContext* cx, HandleValue value, HandlePropertyName name,
MutableHandleValue vp);
JSObject* Lambda(JSContext* cx, HandleFunction fun, HandleObject parent);
JSObject* LambdaArrow(JSContext* cx, HandleFunction fun, HandleObject parent,
HandleValue newTargetv);
bool SetObjectElement(JSContext* cx, HandleObject obj, HandleValue index,
HandleValue value, bool strict);
bool SetObjectElementWithReceiver(JSContext* cx, HandleObject obj,
HandleValue index, HandleValue value,
HandleValue receiver, bool strict);
bool InitElementArray(JSContext* cx, jsbytecode* pc, HandleArrayObject arr,
uint32_t index, HandleValue value);
bool AddValues(JSContext* cx, MutableHandleValue lhs, MutableHandleValue rhs,
MutableHandleValue res);
bool SubValues(JSContext* cx, MutableHandleValue lhs, MutableHandleValue rhs,
MutableHandleValue res);
bool MulValues(JSContext* cx, MutableHandleValue lhs, MutableHandleValue rhs,
MutableHandleValue res);
bool DivValues(JSContext* cx, MutableHandleValue lhs, MutableHandleValue rhs,
MutableHandleValue res);
bool ModValues(JSContext* cx, MutableHandleValue lhs, MutableHandleValue rhs,
MutableHandleValue res);
bool PowValues(JSContext* cx, MutableHandleValue lhs, MutableHandleValue rhs,
MutableHandleValue res);
bool BitNot(JSContext* cx, MutableHandleValue in, MutableHandleValue res);
bool BitXor(JSContext* cx, MutableHandleValue lhs, MutableHandleValue rhs,
MutableHandleValue res);
bool BitOr(JSContext* cx, MutableHandleValue lhs, MutableHandleValue rhs,
MutableHandleValue res);
bool BitAnd(JSContext* cx, MutableHandleValue lhs, MutableHandleValue rhs,
MutableHandleValue res);
bool BitLsh(JSContext* cx, MutableHandleValue lhs, MutableHandleValue rhs,
MutableHandleValue res);
bool BitRsh(JSContext* cx, MutableHandleValue lhs, MutableHandleValue rhs,
MutableHandleValue res);
bool UrshValues(JSContext* cx, MutableHandleValue lhs, MutableHandleValue rhs,
MutableHandleValue res);
bool LessThan(JSContext* cx, MutableHandleValue lhs, MutableHandleValue rhs,
bool* res);
bool LessThanOrEqual(JSContext* cx, MutableHandleValue lhs,
MutableHandleValue rhs, bool* res);
bool GreaterThan(JSContext* cx, MutableHandleValue lhs, MutableHandleValue rhs,
bool* res);
bool GreaterThanOrEqual(JSContext* cx, MutableHandleValue lhs,
MutableHandleValue rhs, bool* res);
bool AtomicIsLockFree(JSContext* cx, HandleValue in, int* out);
template <bool strict>
bool DelPropOperation(JSContext* cx, HandleValue val, HandlePropertyName name,
bool* res);
template <bool strict>
bool DelElemOperation(JSContext* cx, HandleValue val, HandleValue index,
bool* res);
JSObject* BindVarOperation(JSContext* cx, JSObject* envChain);
JSObject* SingletonObjectLiteralOperation(JSContext* cx, HandleScript script,
jsbytecode* pc);
JSObject* ImportMetaOperation(JSContext* cx, HandleScript script);
JSObject* BuiltinObjectOperation(JSContext* cx, BuiltinObjectKind kind);
bool ThrowMsgOperation(JSContext* cx, const unsigned throwMsgKind);
bool GetAndClearException(JSContext* cx, MutableHandleValue res);
bool GetAndClearExceptionAndStack(JSContext* cx, MutableHandleValue res,
MutableHandleSavedFrame stack);
bool DeleteNameOperation(JSContext* cx, HandlePropertyName name,
HandleObject scopeObj, MutableHandleValue res);
bool ImplicitThisOperation(JSContext* cx, HandleObject scopeObj,
HandlePropertyName name, MutableHandleValue res);
bool InitPropGetterSetterOperation(JSContext* cx, jsbytecode* pc,
HandleObject obj, HandlePropertyName name,
HandleObject val);
unsigned GetInitDataPropAttrs(JSOp op);
bool EnterWithOperation(JSContext* cx, AbstractFramePtr frame, HandleValue val,
Handle<WithScope*> scope);
bool InitElemGetterSetterOperation(JSContext* cx, jsbytecode* pc,
HandleObject obj, HandleValue idval,
HandleObject val);
bool SpreadCallOperation(JSContext* cx, HandleScript script, jsbytecode* pc,
HandleValue thisv, HandleValue callee, HandleValue arr,
HandleValue newTarget, MutableHandleValue res);
bool OptimizeSpreadCall(JSContext* cx, HandleValue arg, bool* optimized);
JSObject* NewObjectOperation(JSContext* cx, HandleScript script, jsbytecode* pc,
NewObjectKind newKind = GenericObject);
JSObject* NewObjectOperationWithTemplate(JSContext* cx,
HandleObject templateObject);
JSObject* CreateThisWithTemplate(JSContext* cx, HandleObject templateObject);
ArrayObject* NewArrayOperation(JSContext* cx, HandleScript script,
jsbytecode* pc, uint32_t length,
NewObjectKind newKind = GenericObject);
ArrayObject* NewArrayOperationWithTemplate(JSContext* cx,
HandleObject templateObject);
ArrayObject* NewArrayCopyOnWriteOperation(JSContext* cx, HandleScript script,
jsbytecode* pc);
MOZ_MUST_USE bool GetImportOperation(JSContext* cx, HandleObject envChain,
HandleScript script, jsbytecode* pc,
MutableHandleValue vp);
void ReportRuntimeLexicalError(JSContext* cx, unsigned errorNumber,
HandleId id);
void ReportRuntimeLexicalError(JSContext* cx, unsigned errorNumber,
HandlePropertyName name);
void ReportRuntimeLexicalError(JSContext* cx, unsigned errorNumber,
HandleScript script, jsbytecode* pc);
void ReportInNotObjectError(JSContext* cx, HandleValue lref, int lindex,
HandleValue rref, int rindex);
// The parser only reports redeclarations that occurs within a single
// script. Due to the extensibility of the global lexical scope, we also check
// for redeclarations during runtime in JSOp::GlobalOrEvalDeclInstantation.
void ReportRuntimeRedeclaration(JSContext* cx, HandlePropertyName name,
const char* redeclKind);
bool ThrowCheckIsObject(JSContext* cx, CheckIsObjectKind kind);
bool ThrowUninitializedThis(JSContext* cx);
bool ThrowInitializedThis(JSContext* cx);
bool ThrowHomeObjectNotObject(JSContext* cx);
bool ThrowObjectCoercible(JSContext* cx, HandleValue value);
bool DefaultClassConstructor(JSContext* cx, unsigned argc, Value* vp);
bool Debug_CheckSelfHosted(JSContext* cx, HandleValue v);
bool CheckClassHeritageOperation(JSContext* cx, HandleValue heritage);
PlainObject* ObjectWithProtoOperation(JSContext* cx, HandleValue proto);
JSObject* FunWithProtoOperation(JSContext* cx, HandleFunction fun,
HandleObject parent, HandleObject proto);
JSFunction* MakeDefaultConstructor(JSContext* cx, HandleScript script,
jsbytecode* pc, HandleObject proto);
bool SetPropertySuper(JSContext* cx, HandleObject obj, HandleValue receiver,
HandlePropertyName id, HandleValue rval, bool strict);
} /* namespace js */
#endif /* vm_Interpreter_h */