1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 * vim: set ts=4 sw=4 et tw=78:
4 * ***** BEGIN LICENSE BLOCK *****
5 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
7 * The contents of this file are subject to the Mozilla Public License Version
8 * 1.1 (the "License"); you may not use this file except in compliance with
9 * the License. You may obtain a copy of the License at
10 * http://www.mozilla.org/MPL/
12 * Software distributed under the License is distributed on an "AS IS" basis,
13 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
14 * for the specific language governing rights and limitations under the
17 * The Original Code is Mozilla Communicator client code, released
20 * The Initial Developer of the Original Code is
21 * Netscape Communications Corporation.
22 * Portions created by the Initial Developer are Copyright (C) 1998
23 * the Initial Developer. All Rights Reserved.
27 * Alternatively, the contents of this file may be used under the terms of
28 * either of the GNU General Public License Version 2 or later (the "GPL"),
29 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
30 * in which case the provisions of the GPL or the LGPL are applicable instead
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36 * the provisions above, a recipient may use your version of this file under
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39 * ***** END LICENSE BLOCK ***** */
44 * JS interpreter interface.
53 typedef struct JSFrameRegs
{
54 js::Value
*sp
; /* stack pointer */
55 jsbytecode
*pc
; /* program counter */
56 JSStackFrame
*fp
; /* active frame */
59 /* JS stack frame flags. */
61 JSFRAME_CONSTRUCTING
= 0x01, /* frame is for a constructor invocation */
62 JSFRAME_OVERRIDE_ARGS
= 0x02, /* overridden arguments local variable */
63 JSFRAME_ASSIGNING
= 0x04, /* a complex (not simplex JOF_ASSIGNING) op
64 is currently assigning to a property */
65 JSFRAME_DEBUGGER
= 0x08, /* frame for JS_EvaluateInStackFrame */
66 JSFRAME_EVAL
= 0x10, /* frame for obj_eval */
67 JSFRAME_FLOATING_GENERATOR
= 0x20, /* frame copy stored in a generator obj */
68 JSFRAME_YIELDING
= 0x40, /* js_Interpret dispatched JSOP_YIELD */
69 JSFRAME_GENERATOR
= 0x80, /* frame belongs to generator-iterator */
70 JSFRAME_BAILING
= 0x100, /* walking out of a method JIT'd frame */
71 JSFRAME_RECORDING
= 0x200, /* recording a trace */
72 JSFRAME_BAILED_AT_RETURN
= 0x400, /* bailed at JSOP_RETURN */
73 JSFRAME_DUMMY
= 0x800, /* frame is a dummy frame */
74 JSFRAME_IN_IMACRO
= 0x1000, /* frame has imacpc value available */
76 JSFRAME_SPECIAL
= JSFRAME_DEBUGGER
| JSFRAME_EVAL
79 namespace js
{ namespace mjit
{
81 class InlineFrameAssembler
;
85 * JS stack frame, may be allocated on the C stack by native callers. Always
86 * allocated on cx->stackPool for calls from the interpreter to an interpreted
89 * NB: This struct is manually initialized in jsinterp.c and jsiter.c. If you
90 * add new members, update both files.
95 JSObject
*callobj
; /* lazily created Call object */
96 JSObject
*argsobj
; /* lazily created arguments object */
97 jsbytecode
*imacpc
; /* null or interpreter macro call pc */
98 JSScript
*script
; /* script being interpreted */
101 * The value of |this| in this stack frame, or JSVAL_NULL if |this|
102 * is to be computed lazily on demand.
104 * thisv is eagerly initialized for non-function-call frames and
105 * qualified method calls, but lazily initialized in most unqualified
106 * function calls. See getThisObject().
108 * Usually if argv != NULL then thisv == argv[-1], but natives may
109 * assign to argv[-1]. Also, obj_eval can trigger a special case
110 * where two stack frames have the same argv. If one of the frames fills
111 * in both argv[-1] and thisv, the other frame's thisv is left null.
113 js::Value thisv
; /* "this" pointer if in method */
114 JSFunction
*fun
; /* function being called or null */
117 uintN argc
; /* actual argument count */
118 js::Value
*argv
; /* base of argument stack slots */
121 js::Value rval
; /* function return value */
122 void *annotation
; /* used by Java security */
125 /* Maintained by StackSpace operations */
126 JSStackFrame
*down
; /* previous frame, part of
127 stack layout invariant */
128 jsbytecode
*savedPC
; /* only valid if cx->fp != this */
130 static jsbytecode
*const sInvalidPC
;
133 void *ncode
; /* jit return pc */
136 JSObject
*scopeChain
;
137 JSObject
*blockChain
;
140 uint32 flags
; /* frame flags -- see below */
143 /* Members only needed for inline calls. */
144 void *hookData
; /* debugger call hook data */
145 JSVersion callerVersion
; /* dynamic version of calling script */
148 /* Get the frame's current bytecode, assuming |this| is in |cx|. */
149 jsbytecode
*pc(JSContext
*cx
) const;
151 js::Value
*argEnd() const {
152 return (js::Value
*)this;
155 js::Value
*slots() const {
156 return (js::Value
*)(this + 1);
159 js::Value
*base() const {
160 return slots() + getScript()->nfixed
;
163 /* Call object accessors */
165 bool hasCallObj() const {
166 return callobj
!= NULL
;
169 JSObject
* getCallObj() const {
170 JS_ASSERT(hasCallObj());
174 JSObject
* maybeCallObj() const {
178 void setCallObj(JSObject
*obj
) {
182 static size_t offsetCallObj() {
183 return offsetof(JSStackFrame
, callobj
);
186 /* Arguments object accessors */
188 bool hasArgsObj() const {
189 return argsobj
!= NULL
;
192 JSObject
* getArgsObj() const {
193 JS_ASSERT(hasArgsObj());
194 JS_ASSERT(!isEvalFrame());
198 JSObject
* maybeArgsObj() const {
202 void setArgsObj(JSObject
*obj
) {
206 JSObject
** addressArgsObj() {
210 static size_t offsetArgsObj() {
211 return offsetof(JSStackFrame
, argsobj
);
215 * We can't determine in advance which local variables can live on
216 * the stack and be freed when their dynamic scope ends, and which
217 * will be closed over and need to live in the heap. So we place
218 * variables on the stack initially, note when they are closed
219 * over, and copy those that are out to the heap when we leave
220 * their dynamic scope.
222 * The bytecode compiler produces a tree of block objects
223 * accompanying each JSScript representing those lexical blocks in
224 * the script that have let-bound variables associated with them.
225 * These block objects are never modified, and never become part
226 * of any function's scope chain. Their parent slots point to the
227 * innermost block that encloses them, or are NULL in the
228 * outermost blocks within a function or in eval or global code.
230 * When we are in the static scope of such a block, blockChain
231 * points to its compiler-allocated block object; otherwise, it is
234 * scopeChain is the current scope chain, including 'call' and
235 * 'block' objects for those function calls and lexical blocks
236 * whose static scope we are currently executing in, and 'with'
237 * objects for with statements; the chain is typically terminated
238 * by a global object. However, as an optimization, the young end
239 * of the chain omits block objects we have not yet cloned. To
240 * create a closure, we clone the missing blocks from blockChain
241 * (which is always current), place them at the head of
242 * scopeChain, and use that for the closure's scope chain. If we
243 * never close over a lexical block, we never place a mutable
244 * clone of it on scopeChain.
246 * This lazy cloning is implemented in js_GetScopeChain, which is
247 * also used in some other cases --- entering 'with' blocks, for
251 /* Scope chain accessors */
253 bool hasScopeChain() const {
254 return scopeChain
!= NULL
;
257 JSObject
* getScopeChain() const {
258 JS_ASSERT(hasScopeChain());
262 JSObject
* maybeScopeChain() const {
266 void setScopeChain(JSObject
*obj
) {
270 JSObject
** addressScopeChain() {
274 static size_t offsetScopeChain() {
275 return offsetof(JSStackFrame
, scopeChain
);
278 /* Block chain accessors */
280 bool hasBlockChain() const {
281 return blockChain
!= NULL
;
284 JSObject
* getBlockChain() const {
285 JS_ASSERT(hasBlockChain());
289 JSObject
* maybeBlockChain() const {
293 void setBlockChain(JSObject
*obj
) {
297 static size_t offsetBlockChain() {
298 return offsetof(JSStackFrame
, blockChain
);
301 /* IMacroPC accessors. */
303 bool hasIMacroPC() const { return flags
& JSFRAME_IN_IMACRO
; }
307 * @return The PC at which an imacro started executing (guaranteed non-null. The PC of the
308 * executing imacro must be in regs.pc, so the displaced
309 * original value is stored here.
311 jsbytecode
*getIMacroPC() const {
312 JS_ASSERT(flags
& JSFRAME_IN_IMACRO
);
316 /* @return The imacro pc if hasIMacroPC; otherwise, NULL. */
317 jsbytecode
*maybeIMacroPC() const { return hasIMacroPC() ? getIMacroPC() : NULL
; }
319 void clearIMacroPC() { flags
&= ~JSFRAME_IN_IMACRO
; }
321 void setIMacroPC(jsbytecode
*newIMacPC
) {
322 JS_ASSERT(newIMacPC
);
323 JS_ASSERT(!(flags
& JSFRAME_IN_IMACRO
));
325 flags
|= JSFRAME_IN_IMACRO
;
328 /* Annotation accessors */
330 bool hasAnnotation() const {
331 return annotation
!= NULL
;
334 void* getAnnotation() const {
335 JS_ASSERT(hasAnnotation());
339 void* maybeAnnotation() const {
343 void setAnnotation(void *annot
) {
347 static size_t offsetAnnotation() {
348 return offsetof(JSStackFrame
, annotation
);
351 /* Debugger hook data accessors */
353 bool hasHookData() const {
354 return hookData
!= NULL
;
357 void* getHookData() const {
358 JS_ASSERT(hasHookData());
362 void* maybeHookData() const {
366 void setHookData(void *data
) {
370 static size_t offsetHookData() {
371 return offsetof(JSStackFrame
, hookData
);
374 /* Version accessors */
376 JSVersion
getCallerVersion() const {
377 return callerVersion
;
380 void setCallerVersion(JSVersion version
) {
381 callerVersion
= version
;
384 static size_t offsetCallerVersion() {
385 return offsetof(JSStackFrame
, callerVersion
);
388 /* Script accessors */
390 bool hasScript() const {
391 return script
!= NULL
;
394 JSScript
* getScript() const {
395 JS_ASSERT(hasScript());
399 JSScript
* maybeScript() const {
403 size_t getFixedCount() const {
404 return getScript()->nfixed
;
407 size_t getSlotCount() const {
408 return getScript()->nslots
;
411 void setScript(JSScript
*s
) {
415 static size_t offsetScript() {
416 return offsetof(JSStackFrame
, script
);
419 /* Function accessors */
421 bool hasFunction() const {
425 JSFunction
* getFunction() const {
426 JS_ASSERT(hasFunction());
430 JSFunction
* maybeFunction() const {
434 static size_t offsetFunction() {
435 return offsetof(JSStackFrame
, fun
);
438 size_t numFormalArgs() const {
439 JS_ASSERT(!isEvalFrame());
440 return getFunction()->nargs
;
443 void setFunction(JSFunction
*f
) {
447 /* This-value accessors */
449 const js::Value
& getThisValue() {
453 void setThisValue(const js::Value
&v
) {
457 static size_t offsetThisValue() {
458 return offsetof(JSStackFrame
, thisv
);
461 /* Return-value accessors */
463 const js::Value
& getReturnValue() {
467 void setReturnValue(const js::Value
&v
) {
471 void clearReturnValue() {
475 js::Value
* addressReturnValue() {
479 static size_t offsetReturnValue() {
480 return offsetof(JSStackFrame
, rval
);
483 /* Argument count accessors */
485 size_t numActualArgs() const {
486 JS_ASSERT(!isEvalFrame());
490 void setNumActualArgs(size_t n
) {
494 static size_t offsetNumActualArgs() {
495 return offsetof(JSStackFrame
, argc
);
498 /* Other accessors */
500 void putActivationObjects(JSContext
*cx
) {
502 * The order of calls here is important as js_PutCallObject needs to
506 js_PutCallObject(cx
, this);
507 JS_ASSERT(!hasArgsObj());
508 } else if (hasArgsObj()) {
509 js_PutArgsObject(cx
, this);
513 const js::Value
&calleeValue() {
518 /* Infallible getter to return the callee object from this frame. */
519 JSObject
&calleeObject() const {
521 return argv
[-2].toObject();
525 * Fallible getter to compute the correct callee function object, which may
526 * require deferred cloning due to JSObject::methodReadBarrier. For a frame
527 * with null fun member, return true with *vp set from this->calleeValue(),
528 * which may not be an object (it could be undefined).
530 bool getValidCalleeObject(JSContext
*cx
, js::Value
*vp
);
532 void setCalleeObject(JSObject
&callable
) {
534 argv
[-2].setObject(callable
);
538 return argv
? &argv
[-2].toObject() : NULL
;
542 * Get the "variable object" (ES3 term) associated with the Execution
543 * Context's VariableEnvironment (ES5 10.3). The given StackSegment
544 * must contain this stack frame.
546 JSObject
*varobj(js::StackSegment
*seg
) const;
548 /* Short for: varobj(cx->activeSegment()). */
549 JSObject
*varobj(JSContext
*cx
) const;
551 inline JSObject
*getThisObject(JSContext
*cx
);
553 bool isGenerator() const { return !!(flags
& JSFRAME_GENERATOR
); }
554 bool isFloatingGenerator() const {
555 JS_ASSERT_IF(flags
& JSFRAME_FLOATING_GENERATOR
, isGenerator());
556 return !!(flags
& JSFRAME_FLOATING_GENERATOR
);
559 bool isDummyFrame() const { return !!(flags
& JSFRAME_DUMMY
); }
560 bool isEvalFrame() const { return !!(flags
& JSFRAME_EVAL
); }
563 JSObject
*computeThisObject(JSContext
*cx
);
565 /* Contains static assertions for member alignment, don't call. */
566 inline void staticAsserts();
571 JS_STATIC_ASSERT(sizeof(JSStackFrame
) % sizeof(Value
) == 0);
572 static const size_t VALUES_PER_STACK_FRAME
= sizeof(JSStackFrame
) / sizeof(Value
);
577 JSStackFrame::staticAsserts()
579 JS_STATIC_ASSERT(offsetof(JSStackFrame
, rval
) % sizeof(js::Value
) == 0);
580 JS_STATIC_ASSERT(offsetof(JSStackFrame
, thisv
) % sizeof(js::Value
) == 0);
582 /* Static assert for x86 trampolines in MethodJIT.cpp */
583 #if defined(JS_METHODJIT)
584 # if defined(JS_CPU_X86)
585 JS_STATIC_ASSERT(offsetof(JSStackFrame
, rval
) == 0x28);
586 # elif defined(JS_CPU_X64)
587 JS_STATIC_ASSERT(offsetof(JSStackFrame
, rval
) == 0x40);
592 static JS_INLINE uintN
593 GlobalVarCount(JSStackFrame
*fp
)
595 JS_ASSERT(!fp
->hasFunction());
596 return fp
->getScript()->nfixed
;
600 * Refresh and return fp->scopeChain. It may be stale if block scopes are
601 * active but not yet reflected by objects in the scope chain. If a block
602 * scope contains a with, eval, XML filtering predicate, or similar such
603 * dynamically scoped construct, then compile-time block scope at fp->blocks
604 * must reflect at runtime.
607 js_GetScopeChain(JSContext
*cx
, JSStackFrame
*fp
);
610 * Given a context and a vector of [callee, this, args...] for a function that
611 * was specified with a JSFUN_THISP_PRIMITIVE flag, get the primitive value of
612 * |this| into *thisvp. In doing so, if |this| is an object, insist it is an
613 * instance of clasp and extract its private slot value to return via *thisvp.
615 * NB: this function loads and uses *vp before storing *thisvp, so the two may
616 * alias the same Value.
619 js_GetPrimitiveThis(JSContext
*cx
, js::Value
*vp
, js::Class
*clasp
,
620 const js::Value
**vpp
);
625 * For a call with arguments argv including argv[-1] (nominal |this|) and
626 * argv[-2] (callee) replace null |this| with callee's parent and replace
627 * primitive values with the equivalent wrapper objects. argv[-1] must
628 * not be JSVAL_VOID or an activation object.
631 ComputeThisFromArgv(JSContext
*cx
, js::Value
*argv
);
633 JS_ALWAYS_INLINE JSObject
*
634 ComputeThisFromVp(JSContext
*cx
, js::Value
*vp
)
636 extern bool ComputeThisFromArgv(JSContext
*, js::Value
*);
637 return ComputeThisFromArgv(cx
, vp
+ 2) ? &vp
[1].toObject() : NULL
;
640 JS_ALWAYS_INLINE
bool
641 ComputeThisFromVpInPlace(JSContext
*cx
, js::Value
*vp
)
643 extern bool ComputeThisFromArgv(JSContext
*, js::Value
*);
644 return ComputeThisFromArgv(cx
, vp
+ 2);
647 JS_ALWAYS_INLINE
bool
648 PrimitiveThisTest(JSFunction
*fun
, const Value
&v
)
650 uint16 flags
= fun
->flags
;
651 return (v
.isString() && !!(flags
& JSFUN_THISP_STRING
)) ||
652 (v
.isNumber() && !!(flags
& JSFUN_THISP_NUMBER
)) ||
653 (v
.isBoolean() && !!(flags
& JSFUN_THISP_BOOLEAN
));
657 * Abstracts the layout of the stack passed to natives from the engine and from
658 * natives to js::Invoke.
666 CallArgs(Value
*argv
, uintN argc
) : argv_(argv
), argc_(argc
) {}
668 Value
*base() const { return argv_
- 2; }
669 Value
&callee() const { return argv_
[-2]; }
670 Value
&thisv() const { return argv_
[-1]; }
671 Value
&operator[](unsigned i
) const { JS_ASSERT(i
< argc_
); return argv_
[i
]; }
672 Value
*argv() const { return argv_
; }
673 uintN
argc() const { return argc_
; }
674 Value
&rval() const { return argv_
[-2]; }
676 bool computeThis(JSContext
*cx
) const {
677 return ComputeThisFromArgv(cx
, argv_
);
682 * The js::InvokeArgumentsGuard passed to js_Invoke must come from an
683 * immediately-enclosing successful call to js::StackSpace::pushInvokeArgs,
684 * i.e., there must have been no un-popped pushes to cx->stack(). Furthermore,
685 * |args.getvp()[0]| should be the callee, |args.getvp()[1]| should be |this|,
686 * and the range [args.getvp() + 2, args.getvp() + 2 + args.getArgc()) should
687 * be initialized actual arguments.
689 extern JS_REQUIRES_STACK
bool
690 Invoke(JSContext
*cx
, const CallArgs
&args
, uintN flags
);
693 * Consolidated js_Invoke flags simply rename certain JSFRAME_* flags, so that
694 * we can share bits stored in JSStackFrame.flags and passed to:
699 * js_ValueToFunctionObject
700 * js_ValueToCallableObject
701 * js_ReportIsNotFunction
703 * See jsfun.h for the latter four and flag renaming macros.
705 #define JSINVOKE_CONSTRUCT JSFRAME_CONSTRUCTING
708 * Mask to isolate construct and iterator flags for use with jsfun.h functions.
710 #define JSINVOKE_FUNFLAGS JSINVOKE_CONSTRUCT
713 * "External" calls may come from C or C++ code using a JSContext on which no
714 * JS is running (!cx->fp), so they may need to push a dummy JSStackFrame.
718 ExternalInvoke(JSContext
*cx
, const Value
&thisv
, const Value
&fval
,
719 uintN argc
, Value
*argv
, Value
*rval
);
721 static JS_ALWAYS_INLINE
bool
722 ExternalInvoke(JSContext
*cx
, JSObject
*obj
, const Value
&fval
,
723 uintN argc
, Value
*argv
, Value
*rval
)
725 return ExternalInvoke(cx
, ObjectOrNullValue(obj
), fval
, argc
, argv
, rval
);
729 ExternalGetOrSet(JSContext
*cx
, JSObject
*obj
, jsid id
, const Value
&fval
,
730 JSAccessMode mode
, uintN argc
, Value
*argv
, Value
*rval
);
733 * These two functions invoke a function called from a constructor context
734 * (e.g. 'new'). InvokeConstructor handles the general case where a new object
735 * needs to be created for/by the constructor. ConstructWithGivenThis directly
736 * calls the constructor with the given 'this', hence the caller must
737 * understand the semantics of the constructor call.
740 extern JS_REQUIRES_STACK
bool
741 InvokeConstructor(JSContext
*cx
, const CallArgs
&args
);
743 extern JS_REQUIRES_STACK
bool
744 InvokeConstructorWithGivenThis(JSContext
*cx
, JSObject
*thisobj
, const Value
&fval
,
745 uintN argc
, Value
*argv
, Value
*rval
);
748 * Executes a script with the given scope chain in the context of the given
751 extern JS_FORCES_STACK
bool
752 Execute(JSContext
*cx
, JSObject
*chain
, JSScript
*script
,
753 JSStackFrame
*down
, uintN flags
, Value
*result
);
756 * Execute the caller-initialized frame for a user-defined script or function
757 * pointed to by cx->fp until completion or error.
759 extern JS_REQUIRES_STACK
bool
760 Interpret(JSContext
*cx
, JSStackFrame
*stopFp
, uintN inlineCallCount
= 0);
762 extern JS_REQUIRES_STACK
bool
763 RunScript(JSContext
*cx
, JSScript
*script
, JSFunction
*fun
, JSObject
*scopeChain
);
765 #define JSPROP_INITIALIZER 0x100 /* NB: Not a valid property attribute. */
768 CheckRedeclaration(JSContext
*cx
, JSObject
*obj
, jsid id
, uintN attrs
,
769 JSObject
**objp
, JSProperty
**propp
);
772 StrictlyEqual(JSContext
*cx
, const Value
&lval
, const Value
&rval
);
774 /* === except that NaN is the same as NaN and -0 is not the same as +0. */
776 SameValue(const Value
&v1
, const Value
&v2
, JSContext
*cx
);
779 TypeOfValue(JSContext
*cx
, const Value
&v
);
782 InstanceOf(JSContext
*cx
, JSObject
*obj
, Class
*clasp
, Value
*argv
)
784 if (obj
&& obj
->getClass() == clasp
)
786 extern bool InstanceOfSlow(JSContext
*, JSObject
*, Class
*, Value
*);
787 return InstanceOfSlow(cx
, obj
, clasp
, argv
);
791 HasInstance(JSContext
*cx
, JSObject
*obj
, const js::Value
*v
, JSBool
*bp
);
794 GetInstancePrivate(JSContext
*cx
, JSObject
*obj
, Class
*clasp
, Value
*argv
)
796 if (!InstanceOf(cx
, obj
, clasp
, argv
))
798 return obj
->getPrivate();
802 ValueToId(JSContext
*cx
, const Value
&v
, jsid
*idp
);
805 * @param closureLevel The static level of the closure that the cookie
807 * @param cookie Level amount is a "skip" (delta) value from the
809 * @return The value of the upvar.
811 extern const js::Value
&
812 GetUpvar(JSContext
*cx
, uintN level
, js::UpvarCookie cookie
);
817 * JS_LONE_INTERPRET indicates that the compiler should see just the code for
818 * the js_Interpret function when compiling jsinterp.cpp. The rest of the code
819 * from the file should be visible only when compiling jsinvoke.cpp. It allows
820 * platform builds to optimize selectively js_Interpret when the granularity
821 * of the optimizations with the given compiler is a compilation unit.
823 * JS_STATIC_INTERPRET is the modifier for functions defined in jsinterp.cpp
824 * that only js_Interpret calls. When JS_LONE_INTERPRET is true all such
825 * functions are declared below.
827 #ifndef JS_LONE_INTERPRET
829 # define JS_LONE_INTERPRET 0
831 # define JS_LONE_INTERPRET 1
835 #define JS_MAX_INLINE_CALL_COUNT 3000
837 #if !JS_LONE_INTERPRET
838 # define JS_STATIC_INTERPRET static
840 # define JS_STATIC_INTERPRET
842 extern JS_REQUIRES_STACK JSBool
843 js_EnterWith(JSContext
*cx
, jsint stackIndex
);
845 extern JS_REQUIRES_STACK
void
846 js_LeaveWith(JSContext
*cx
);
849 * Find the results of incrementing or decrementing *vp. For pre-increments,
850 * both *vp and *vp2 will contain the result on return. For post-increments,
851 * vp will contain the original value converted to a number and vp2 will get
852 * the result. Both vp and vp2 must be roots.
855 js_DoIncDec(JSContext
*cx
, const JSCodeSpec
*cs
, js::Value
*vp
, js::Value
*vp2
);
858 * Opcode tracing helper. When len is not 0, cx->fp->regs->pc[-len] gives the
861 extern JS_REQUIRES_STACK
void
862 js_TraceOpcode(JSContext
*cx
);
865 * JS_OPMETER helper functions.
868 js_MeterOpcodePair(JSOp op1
, JSOp op2
);
871 js_MeterSlotOpcode(JSOp op
, uint32 slot
);
873 #endif /* JS_LONE_INTERPRET */
876 * Unwind block and scope chains to match the given depth. The function sets
877 * fp->sp on return to stackDepth.
879 extern JS_REQUIRES_STACK JSBool
880 js_UnwindScope(JSContext
*cx
, jsint stackDepth
, JSBool normalUnwind
);
883 js_OnUnknownMethod(JSContext
*cx
, js::Value
*vp
);
885 extern JS_REQUIRES_STACK
js::Class
*
886 js_IsActiveWithOrBlock(JSContext
*cx
, JSObject
*obj
, int stackDepth
);
889 JSStackFrame::getThisObject(JSContext
*cx
)
891 JS_ASSERT(!isDummyFrame());
892 return thisv
.isPrimitive() ? computeThisObject(cx
) : &thisv
.toObject();
895 #endif /* jsinterp_h___ */