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1 siliconforks 332 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2     * vim: set ts=8 sw=4 et tw=78:
3     *
4     * ***** BEGIN LICENSE BLOCK *****
5     * Version: MPL 1.1/GPL 2.0/LGPL 2.1
6     *
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/
11     *
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
15     * License.
16     *
17     * The Original Code is Mozilla Communicator client code, released
18     * March 31, 1998.
19     *
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.
24     *
25     * Contributor(s):
26     *
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
31     * of those above. If you wish to allow use of your version of this file only
32     * under the terms of either the GPL or the LGPL, and not to allow others to
33     * use your version of this file under the terms of the MPL, indicate your
34     * decision by deleting the provisions above and replace them with the notice
35     * and other provisions required by the GPL or the LGPL. If you do not delete
36     * the provisions above, a recipient may use your version of this file under
37     * the terms of any one of the MPL, the GPL or the LGPL.
38     *
39     * ***** END LICENSE BLOCK ***** */
40    
41     #ifndef jsinterp_h___
42     #define jsinterp_h___
43     /*
44     * JS interpreter interface.
45     */
46     #include "jsprvtd.h"
47     #include "jspubtd.h"
48     #include "jsfun.h"
49     #include "jsopcode.h"
50     #include "jsscript.h"
51    
52     JS_BEGIN_EXTERN_C
53    
54     typedef struct JSFrameRegs {
55     jsbytecode *pc; /* program counter */
56     jsval *sp; /* stack pointer */
57     } JSFrameRegs;
58    
59     /*
60     * JS stack frame, may be allocated on the C stack by native callers. Always
61     * allocated on cx->stackPool for calls from the interpreter to an interpreted
62     * function.
63     *
64     * NB: This struct is manually initialized in jsinterp.c and jsiter.c. If you
65     * add new members, update both files. But first, try to remove members. The
66     * sharp* and xml* members should be moved onto the stack as local variables
67     * with well-known slots, if possible.
68     */
69     struct JSStackFrame {
70     JSFrameRegs *regs;
71 siliconforks 399 jsbytecode *imacpc; /* null or interpreter macro call pc */
72 siliconforks 332 jsval *slots; /* variables, locals and operand stack */
73     JSObject *callobj; /* lazily created Call object */
74     JSObject *argsobj; /* lazily created arguments object */
75     JSObject *varobj; /* variables object, where vars go */
76     JSObject *callee; /* function or script object */
77     JSScript *script; /* script being interpreted */
78     JSFunction *fun; /* function being called or null */
79     JSObject *thisp; /* "this" pointer if in method */
80     uintN argc; /* actual argument count */
81     jsval *argv; /* base of argument stack slots */
82     jsval rval; /* function return value */
83     JSStackFrame *down; /* previous frame */
84     void *annotation; /* used by Java security */
85     JSObject *scopeChain; /* scope chain */
86     uintN sharpDepth; /* array/object initializer depth */
87     JSObject *sharpArray; /* scope for #n= initializer vars */
88     uint32 flags; /* frame flags -- see below */
89     JSStackFrame *dormantNext; /* next dormant frame chain */
90     JSObject *xmlNamespace; /* null or default xml namespace in E4X */
91     JSObject *blockChain; /* active compile-time block scopes */
92     JSStackFrame *displaySave; /* previous value of display entry for
93     script->staticDepth */
94     #ifdef DEBUG
95     jsrefcount pcDisabledSave; /* for balanced property cache control */
96     #endif
97     };
98    
99 siliconforks 399 #ifdef DEBUG
100     #ifdef __cplusplus
101     static JS_INLINE uintN
102     FramePCOffset(JSStackFrame* fp)
103     {
104     return uintN((fp->imacpc ? fp->imacpc : fp->regs->pc) - fp->script->code);
105     }
106     #endif
107     #endif
108    
109 siliconforks 332 static JS_INLINE jsval *
110     StackBase(JSStackFrame *fp)
111     {
112     return fp->slots + fp->script->nfixed;
113     }
114    
115     static JS_INLINE uintN
116     GlobalVarCount(JSStackFrame *fp)
117     {
118     uintN n;
119    
120     JS_ASSERT(!fp->fun);
121     n = fp->script->nfixed;
122     if (fp->script->regexpsOffset != 0)
123     n -= JS_SCRIPT_REGEXPS(fp->script)->length;
124     return n;
125     }
126    
127     typedef struct JSInlineFrame {
128     JSStackFrame frame; /* base struct */
129     JSFrameRegs callerRegs; /* parent's frame registers */
130     void *mark; /* mark before inline frame */
131     void *hookData; /* debugger call hook data */
132     JSVersion callerVersion; /* dynamic version of calling script */
133     } JSInlineFrame;
134    
135     /* JS stack frame flags. */
136     #define JSFRAME_CONSTRUCTING 0x01 /* frame is for a constructor invocation */
137     #define JSFRAME_COMPUTED_THIS 0x02 /* frame.thisp was computed already */
138     #define JSFRAME_ASSIGNING 0x04 /* a complex (not simplex JOF_ASSIGNING) op
139     is currently assigning to a property */
140     #define JSFRAME_DEBUGGER 0x08 /* frame for JS_EvaluateInStackFrame */
141     #define JSFRAME_EVAL 0x10 /* frame for obj_eval */
142     #define JSFRAME_ROOTED_ARGV 0x20 /* frame.argv is rooted by the caller */
143     #define JSFRAME_YIELDING 0x40 /* js_Interpret dispatched JSOP_YIELD */
144     #define JSFRAME_ITERATOR 0x80 /* trying to get an iterator for for-in */
145     #define JSFRAME_POP_BLOCKS 0x100 /* scope chain contains blocks to pop */
146     #define JSFRAME_GENERATOR 0x200 /* frame belongs to generator-iterator */
147 siliconforks 399 #define JSFRAME_IMACRO_START 0x400 /* imacro starting -- see jstracer.h */
148 siliconforks 332
149     #define JSFRAME_OVERRIDE_SHIFT 24 /* override bit-set params; see jsfun.c */
150     #define JSFRAME_OVERRIDE_BITS 8
151    
152     #define JSFRAME_SPECIAL (JSFRAME_DEBUGGER | JSFRAME_EVAL)
153    
154     /*
155     * Property cache with structurally typed capabilities for invalidation, for
156     * polymorphic callsite method/get/set speedups.
157     *
158     * See bug https://bugzilla.mozilla.org/show_bug.cgi?id=365851.
159     */
160     #define PROPERTY_CACHE_LOG2 12
161     #define PROPERTY_CACHE_SIZE JS_BIT(PROPERTY_CACHE_LOG2)
162     #define PROPERTY_CACHE_MASK JS_BITMASK(PROPERTY_CACHE_LOG2)
163    
164     /*
165     * Add kshape rather than xor it to avoid collisions between nearby bytecode
166     * that are evolving an object by setting successive properties, incrementing
167     * the object's scope->shape on each set.
168     */
169     #define PROPERTY_CACHE_HASH(pc,kshape) \
170     (((((jsuword)(pc) >> PROPERTY_CACHE_LOG2) ^ (jsuword)(pc)) + (kshape)) & \
171     PROPERTY_CACHE_MASK)
172    
173     #define PROPERTY_CACHE_HASH_PC(pc,kshape) \
174     PROPERTY_CACHE_HASH(pc, kshape)
175    
176     #define PROPERTY_CACHE_HASH_ATOM(atom,obj,pobj) \
177     PROPERTY_CACHE_HASH((jsuword)(atom) >> 2, OBJ_SHAPE(obj))
178    
179     /*
180     * Property cache value capability macros.
181     */
182     #define PCVCAP_PROTOBITS 4
183     #define PCVCAP_PROTOSIZE JS_BIT(PCVCAP_PROTOBITS)
184     #define PCVCAP_PROTOMASK JS_BITMASK(PCVCAP_PROTOBITS)
185    
186     #define PCVCAP_SCOPEBITS 4
187     #define PCVCAP_SCOPESIZE JS_BIT(PCVCAP_SCOPEBITS)
188     #define PCVCAP_SCOPEMASK JS_BITMASK(PCVCAP_SCOPEBITS)
189    
190     #define PCVCAP_TAGBITS (PCVCAP_PROTOBITS + PCVCAP_SCOPEBITS)
191     #define PCVCAP_TAGMASK JS_BITMASK(PCVCAP_TAGBITS)
192     #define PCVCAP_TAG(t) ((t) & PCVCAP_TAGMASK)
193    
194     #define PCVCAP_MAKE(t,s,p) (((t) << PCVCAP_TAGBITS) | \
195     ((s) << PCVCAP_PROTOBITS) | \
196     (p))
197     #define PCVCAP_SHAPE(t) ((t) >> PCVCAP_TAGBITS)
198    
199     #define SHAPE_OVERFLOW_BIT JS_BIT(32 - PCVCAP_TAGBITS)
200    
201 siliconforks 399 /*
202     * When sprop is not null and the shape generation triggers the GC due to a
203     * shape overflow, the functions roots sprop.
204     */
205 siliconforks 332 extern uint32
206 siliconforks 399 js_GenerateShape(JSContext *cx, JSBool gcLocked, JSScopeProperty *sprop);
207 siliconforks 332
208     struct JSPropCacheEntry {
209     jsbytecode *kpc; /* pc if vcap tag is <= 1, else atom */
210     jsuword kshape; /* key shape if pc, else obj for atom */
211     jsuword vcap; /* value capability, see above */
212     jsuword vword; /* value word, see PCVAL_* below */
213     };
214    
215     #if defined DEBUG_brendan || defined DEBUG_brendaneich
216     #define JS_PROPERTY_CACHE_METERING 1
217     #endif
218    
219     typedef struct JSPropertyCache {
220     JSPropCacheEntry table[PROPERTY_CACHE_SIZE];
221     JSBool empty;
222     jsrefcount disabled; /* signed for anti-underflow asserts */
223     #ifdef JS_PROPERTY_CACHE_METERING
224     uint32 fills; /* number of cache entry fills */
225     uint32 nofills; /* couldn't fill (e.g. default get) */
226     uint32 rofills; /* set on read-only prop can't fill */
227     uint32 disfills; /* fill attempts on disabled cache */
228     uint32 oddfills; /* fill attempt after setter deleted */
229     uint32 modfills; /* fill that rehashed to a new entry */
230     uint32 brandfills; /* scope brandings to type structural
231     method fills */
232     uint32 noprotos; /* resolve-returned non-proto pobj */
233     uint32 longchains; /* overlong scope and/or proto chain */
234     uint32 recycles; /* cache entries recycled by fills */
235     uint32 pcrecycles; /* pc-keyed entries recycled by atom-
236     keyed fills */
237     uint32 tests; /* cache probes */
238     uint32 pchits; /* fast-path polymorphic op hits */
239     uint32 protopchits; /* pchits hitting immediate prototype */
240     uint32 initests; /* cache probes from JSOP_INITPROP */
241     uint32 inipchits; /* init'ing next property pchit case */
242     uint32 inipcmisses; /* init'ing next property pc misses */
243     uint32 settests; /* cache probes from JOF_SET opcodes */
244     uint32 addpchits; /* adding next property pchit case */
245     uint32 setpchits; /* setting existing property pchit */
246     uint32 setpcmisses; /* setting/adding property pc misses */
247     uint32 slotchanges; /* clasp->reserveSlots result variance-
248     induced slot changes */
249     uint32 setmisses; /* JSOP_SET{NAME,PROP} total misses */
250     uint32 idmisses; /* slow-path key id == atom misses */
251     uint32 komisses; /* slow-path key object misses */
252     uint32 vcmisses; /* value capability misses */
253     uint32 misses; /* cache misses */
254     uint32 flushes; /* cache flushes */
255     uint32 pcpurges; /* shadowing purges on proto chain */
256     # define PCMETER(x) x
257     #else
258     # define PCMETER(x) ((void)0)
259     #endif
260     } JSPropertyCache;
261    
262     /*
263     * Property cache value tagging/untagging macros.
264     */
265     #define PCVAL_OBJECT 0
266     #define PCVAL_SLOT 1
267     #define PCVAL_SPROP 2
268    
269     #define PCVAL_TAGBITS 2
270     #define PCVAL_TAGMASK JS_BITMASK(PCVAL_TAGBITS)
271     #define PCVAL_TAG(v) ((v) & PCVAL_TAGMASK)
272     #define PCVAL_CLRTAG(v) ((v) & ~(jsuword)PCVAL_TAGMASK)
273     #define PCVAL_SETTAG(v,t) ((jsuword)(v) | (t))
274    
275     #define PCVAL_NULL 0
276     #define PCVAL_IS_NULL(v) ((v) == PCVAL_NULL)
277    
278     #define PCVAL_IS_OBJECT(v) (PCVAL_TAG(v) == PCVAL_OBJECT)
279     #define PCVAL_TO_OBJECT(v) ((JSObject *) (v))
280     #define OBJECT_TO_PCVAL(obj) ((jsuword) (obj))
281    
282     #define PCVAL_OBJECT_TO_JSVAL(v) OBJECT_TO_JSVAL(PCVAL_TO_OBJECT(v))
283     #define JSVAL_OBJECT_TO_PCVAL(v) OBJECT_TO_PCVAL(JSVAL_TO_OBJECT(v))
284    
285     #define PCVAL_IS_SLOT(v) ((v) & PCVAL_SLOT)
286     #define PCVAL_TO_SLOT(v) ((jsuint)(v) >> 1)
287     #define SLOT_TO_PCVAL(i) (((jsuword)(i) << 1) | PCVAL_SLOT)
288    
289     #define PCVAL_IS_SPROP(v) (PCVAL_TAG(v) == PCVAL_SPROP)
290     #define PCVAL_TO_SPROP(v) ((JSScopeProperty *) PCVAL_CLRTAG(v))
291     #define SPROP_TO_PCVAL(sprop) PCVAL_SETTAG(sprop, PCVAL_SPROP)
292    
293     /*
294     * Fill property cache entry for key cx->fp->pc, optimized value word computed
295     * from obj and sprop, and entry capability forged from 24-bit OBJ_SHAPE(obj),
296     * 4-bit scopeIndex, and 4-bit protoIndex.
297     */
298     extern void
299     js_FillPropertyCache(JSContext *cx, JSObject *obj, jsuword kshape,
300     uintN scopeIndex, uintN protoIndex,
301     JSObject *pobj, JSScopeProperty *sprop,
302     JSPropCacheEntry **entryp);
303    
304     /*
305     * Property cache lookup macros. PROPERTY_CACHE_TEST is designed to inline the
306     * fast path in js_Interpret, so it makes "just-so" restrictions on parameters,
307     * e.g. pobj and obj should not be the same variable, since for JOF_PROP-mode
308     * opcodes, obj must not be changed because of a cache miss.
309     *
310     * On return from PROPERTY_CACHE_TEST, if atom is null then obj points to the
311     * scope chain element in which the property was found, pobj is locked, and
312     * entry is valid. If atom is non-null then no object is locked but entry is
313     * still set correctly for use, e.g., by js_FillPropertyCache and atom should
314     * be used as the id to find.
315     *
316     * We must lock pobj on a hit in order to close races with threads that might
317     * be deleting a property from its scope, or otherwise invalidating property
318     * caches (on all threads) by re-generating scope->shape.
319     */
320     #define PROPERTY_CACHE_TEST(cx, pc, obj, pobj, entry, atom) \
321     do { \
322     JSPropertyCache *cache_ = &JS_PROPERTY_CACHE(cx); \
323     uint32 kshape_ = (JS_ASSERT(OBJ_IS_NATIVE(obj)), OBJ_SHAPE(obj)); \
324     entry = &cache_->table[PROPERTY_CACHE_HASH_PC(pc, kshape_)]; \
325     PCMETER(cache_->tests++); \
326     JS_ASSERT(&obj != &pobj); \
327     if (entry->kpc == pc && entry->kshape == kshape_) { \
328     JSObject *tmp_; \
329     pobj = obj; \
330     JS_LOCK_OBJ(cx, pobj); \
331     JS_ASSERT(PCVCAP_TAG(entry->vcap) <= 1); \
332     if (PCVCAP_TAG(entry->vcap) == 1 && \
333     (tmp_ = LOCKED_OBJ_GET_PROTO(pobj)) != NULL && \
334     OBJ_IS_NATIVE(tmp_)) { \
335     JS_UNLOCK_OBJ(cx, pobj); \
336     pobj = tmp_; \
337     JS_LOCK_OBJ(cx, pobj); \
338     } \
339     if (PCVCAP_SHAPE(entry->vcap) == OBJ_SHAPE(pobj)) { \
340     PCMETER(cache_->pchits++); \
341     PCMETER(!PCVCAP_TAG(entry->vcap) || cache_->protopchits++); \
342     pobj = OBJ_SCOPE(pobj)->object; \
343     atom = NULL; \
344     break; \
345     } \
346     JS_UNLOCK_OBJ(cx, pobj); \
347     } \
348     atom = js_FullTestPropertyCache(cx, pc, &obj, &pobj, &entry); \
349     if (atom) \
350     PCMETER(cache_->misses++); \
351     } while (0)
352    
353     extern JSAtom *
354     js_FullTestPropertyCache(JSContext *cx, jsbytecode *pc,
355     JSObject **objp, JSObject **pobjp,
356     JSPropCacheEntry **entryp);
357    
358     extern void
359     js_FlushPropertyCache(JSContext *cx);
360    
361     extern void
362     js_FlushPropertyCacheForScript(JSContext *cx, JSScript *script);
363    
364     extern void
365     js_DisablePropertyCache(JSContext *cx);
366    
367     extern void
368     js_EnablePropertyCache(JSContext *cx);
369    
370     /*
371     * Interpreter stack arena-pool alloc and free functions.
372     */
373     extern JS_FRIEND_API(jsval *)
374     js_AllocStack(JSContext *cx, uintN nslots, void **markp);
375    
376     extern JS_FRIEND_API(void)
377     js_FreeStack(JSContext *cx, void *mark);
378    
379     /*
380     * Refresh and return fp->scopeChain. It may be stale if block scopes are
381     * active but not yet reflected by objects in the scope chain. If a block
382     * scope contains a with, eval, XML filtering predicate, or similar such
383     * dynamically scoped construct, then compile-time block scope at fp->blocks
384     * must reflect at runtime.
385     */
386     extern JSObject *
387     js_GetScopeChain(JSContext *cx, JSStackFrame *fp);
388    
389     /*
390     * Given a context and a vector of [callee, this, args...] for a function that
391     * was specified with a JSFUN_THISP_PRIMITIVE flag, get the primitive value of
392     * |this| into *thisvp. In doing so, if |this| is an object, insist it is an
393     * instance of clasp and extract its private slot value to return via *thisvp.
394     *
395     * NB: this function loads and uses *vp before storing *thisvp, so the two may
396     * alias the same jsval.
397     */
398     extern JSBool
399     js_GetPrimitiveThis(JSContext *cx, jsval *vp, JSClass *clasp, jsval *thisvp);
400    
401     /*
402     * For a call with arguments argv including argv[-1] (nominal |this|) and
403     * argv[-2] (callee) replace null |this| with callee's parent, replace
404     * primitive values with the equivalent wrapper objects and censor activation
405     * objects as, per ECMA-262, they may not be referred to by |this|. argv[-1]
406     * must not be a JSVAL_VOID.
407     */
408     extern JSObject *
409     js_ComputeThis(JSContext *cx, JSBool lazy, jsval *argv);
410    
411     extern const uint16 js_PrimitiveTestFlags[];
412    
413     #define PRIMITIVE_THIS_TEST(fun,thisv) \
414     (JS_ASSERT(!JSVAL_IS_VOID(thisv)), \
415     JSFUN_THISP_TEST(JSFUN_THISP_FLAGS((fun)->flags), \
416     js_PrimitiveTestFlags[JSVAL_TAG(thisv) - 1]))
417    
418     /*
419     * NB: js_Invoke requires that cx is currently running JS (i.e., that cx->fp
420     * is non-null), and that vp points to the callee, |this| parameter, and
421     * actual arguments of the call. [vp .. vp + 2 + argc) must belong to the last
422     * JS stack segment that js_AllocStack allocated. The function may use the
423     * space available after vp + 2 + argc in the stack segment for temporaries,
424     * so the caller should not use that space for values that must be preserved
425     * across the call.
426     */
427     extern JS_FRIEND_API(JSBool)
428     js_Invoke(JSContext *cx, uintN argc, jsval *vp, uintN flags);
429    
430     /*
431     * Consolidated js_Invoke flags simply rename certain JSFRAME_* flags, so that
432     * we can share bits stored in JSStackFrame.flags and passed to:
433     *
434     * js_Invoke
435     * js_InternalInvoke
436     * js_ValueToFunction
437     * js_ValueToFunctionObject
438     * js_ValueToCallableObject
439     * js_ReportIsNotFunction
440     *
441     * See jsfun.h for the latter four and flag renaming macros.
442     */
443     #define JSINVOKE_CONSTRUCT JSFRAME_CONSTRUCTING
444     #define JSINVOKE_ITERATOR JSFRAME_ITERATOR
445    
446     /*
447     * Mask to isolate construct and iterator flags for use with jsfun.h functions.
448     */
449     #define JSINVOKE_FUNFLAGS (JSINVOKE_CONSTRUCT | JSINVOKE_ITERATOR)
450    
451     /*
452     * "Internal" calls may come from C or C++ code using a JSContext on which no
453     * JS is running (!cx->fp), so they may need to push a dummy JSStackFrame.
454     */
455     #define js_InternalCall(cx,obj,fval,argc,argv,rval) \
456     js_InternalInvoke(cx, obj, fval, 0, argc, argv, rval)
457    
458     #define js_InternalConstruct(cx,obj,fval,argc,argv,rval) \
459     js_InternalInvoke(cx, obj, fval, JSINVOKE_CONSTRUCT, argc, argv, rval)
460    
461     extern JSBool
462     js_InternalInvoke(JSContext *cx, JSObject *obj, jsval fval, uintN flags,
463     uintN argc, jsval *argv, jsval *rval);
464    
465     extern JSBool
466     js_InternalGetOrSet(JSContext *cx, JSObject *obj, jsid id, jsval fval,
467     JSAccessMode mode, uintN argc, jsval *argv, jsval *rval);
468    
469     extern JSBool
470     js_Execute(JSContext *cx, JSObject *chain, JSScript *script,
471     JSStackFrame *down, uintN flags, jsval *result);
472    
473     extern JSBool
474     js_InvokeConstructor(JSContext *cx, uintN argc, JSBool clampReturn, jsval *vp);
475    
476     extern JSBool
477     js_Interpret(JSContext *cx);
478    
479     #define JSPROP_INITIALIZER 0x100 /* NB: Not a valid property attribute. */
480    
481     extern JSBool
482     js_CheckRedeclaration(JSContext *cx, JSObject *obj, jsid id, uintN attrs,
483     JSObject **objp, JSProperty **propp);
484    
485     extern JSBool
486     js_StrictlyEqual(JSContext *cx, jsval lval, jsval rval);
487    
488     /*
489     * JS_LONE_INTERPRET indicates that the compiler should see just the code for
490     * the js_Interpret function when compiling jsinterp.cpp. The rest of the code
491     * from the file should be visible only when compiling jsinvoke.cpp. It allows
492     * platform builds to optimize selectively js_Interpret when the granularity
493     * of the optimizations with the given compiler is a compilation unit.
494     *
495     * JS_STATIC_INTERPRET is the modifier for functions defined in jsinterp.cpp
496     * that only js_Interpret calls. When JS_LONE_INTERPRET is true all such
497     * functions are declared below.
498     */
499     #ifndef JS_LONE_INTERPRET
500     # ifdef _MSC_VER
501     # define JS_LONE_INTERPRET 0
502     # else
503     # define JS_LONE_INTERPRET 1
504     # endif
505     #endif
506    
507     #if !JS_LONE_INTERPRET
508     # define JS_STATIC_INTERPRET static
509     #else
510     # define JS_STATIC_INTERPRET
511    
512     extern jsval *
513     js_AllocRawStack(JSContext *cx, uintN nslots, void **markp);
514    
515     extern void
516     js_FreeRawStack(JSContext *cx, void *mark);
517    
518     /*
519     * ECMA requires "the global object", but in embeddings such as the browser,
520     * which have multiple top-level objects (windows, frames, etc. in the DOM),
521     * we prefer fun's parent. An example that causes this code to run:
522     *
523     * // in window w1
524     * function f() { return this }
525     * function g() { return f }
526     *
527     * // in window w2
528     * var h = w1.g()
529     * alert(h() == w1)
530     *
531     * The alert should display "true".
532     */
533     extern JSObject *
534     js_ComputeGlobalThis(JSContext *cx, JSBool lazy, jsval *argv);
535    
536     extern JSBool
537     js_EnterWith(JSContext *cx, jsint stackIndex);
538    
539     extern void
540     js_LeaveWith(JSContext *cx);
541    
542     extern JSClass *
543     js_IsActiveWithOrBlock(JSContext *cx, JSObject *obj, int stackDepth);
544    
545     extern jsint
546     js_CountWithBlocks(JSContext *cx, JSStackFrame *fp);
547    
548     /*
549     * Unwind block and scope chains to match the given depth. The function sets
550     * fp->sp on return to stackDepth.
551     */
552     extern JSBool
553     js_UnwindScope(JSContext *cx, JSStackFrame *fp, jsint stackDepth,
554     JSBool normalUnwind);
555    
556     extern JSBool
557     js_InternNonIntElementId(JSContext *cx, JSObject *obj, jsval idval, jsid *idp);
558    
559     extern JSBool
560     js_OnUnknownMethod(JSContext *cx, jsval *vp);
561    
562     /*
563     * Find the results of incrementing or decrementing *vp. For pre-increments,
564     * both *vp and *vp2 will contain the result on return. For post-increments,
565     * vp will contain the original value converted to a number and vp2 will get
566     * the result. Both vp and vp2 must be roots.
567     */
568     extern JSBool
569     js_DoIncDec(JSContext *cx, const JSCodeSpec *cs, jsval *vp, jsval *vp2);
570    
571     /*
572     * Opcode tracing helper. When len is not 0, cx->fp->regs->pc[-len] gives the
573     * previous opcode.
574     */
575     extern void
576     js_TraceOpcode(JSContext *cx, jsint len);
577    
578     /*
579     * JS_OPMETER helper functions.
580     */
581     extern void
582     js_MeterOpcodePair(JSOp op1, JSOp op2);
583    
584     extern void
585     js_MeterSlotOpcode(JSOp op, uint32 slot);
586    
587     #endif /* JS_LONE_INTERPRET */
588    
589     JS_END_EXTERN_C
590    
591     #endif /* jsinterp_h___ */

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