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1 /* -*- 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 jsbytecode *imacpc; /* null or interpreter macro call pc */
72 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
86 /*
87 * We can't determine in advance which local variables can live on
88 * the stack and be freed when their dynamic scope ends, and which
89 * will be closed over and need to live in the heap. So we place
90 * variables on the stack initially, note when they are closed
91 * over, and copy those that are out to the heap when we leave
92 * their dynamic scope.
93 *
94 * The bytecode compiler produces a tree of block objects
95 * accompanying each JSScript representing those lexical blocks in
96 * the script that have let-bound variables associated with them.
97 * These block objects are never modified, and never become part
98 * of any function's scope chain. Their parent slots point to the
99 * innermost block that encloses them, or are NULL in the
100 * outermost blocks within a function or in eval or global code.
101 *
102 * When we are in the static scope of such a block, blockChain
103 * points to its compiler-allocated block object; otherwise, it is
104 * NULL.
105 *
106 * scopeChain is the current scope chain, including 'call' and
107 * 'block' objects for those function calls and lexical blocks
108 * whose static scope we are currently executing in, and 'with'
109 * objects for with statements; the chain is typically terminated
110 * by a global object. However, as an optimization, the young end
111 * of the chain omits block objects we have not yet cloned. To
112 * create a closure, we clone the missing blocks from blockChain
113 * (which is always current), place them at the head of
114 * scopeChain, and use that for the closure's scope chain. If we
115 * never close over a lexical block, we never place a mutable
116 * clone of it on scopeChain.
117 *
118 * This lazy cloning is implemented in js_GetScopeChain, which is
119 * also used in some other cases --- entering 'with' blocks, for
120 * example.
121 */
122 JSObject *scopeChain;
123 JSObject *blockChain;
124
125 uintN sharpDepth; /* array/object initializer depth */
126 JSObject *sharpArray; /* scope for #n= initializer vars */
127 uint32 flags; /* frame flags -- see below */
128 JSStackFrame *dormantNext; /* next dormant frame chain */
129 JSObject *xmlNamespace; /* null or default xml namespace in E4X */
130 JSStackFrame *displaySave; /* previous value of display entry for
131 script->staticLevel */
132
133 #ifdef __cplusplus /* Aargh, LiveConnect, bug 442399. */
134 inline void assertValidStackDepth(uintN depth);
135 #endif
136 };
137
138 #ifdef __cplusplus
139 static JS_INLINE uintN
140 FramePCOffset(JSStackFrame* fp)
141 {
142 return uintN((fp->imacpc ? fp->imacpc : fp->regs->pc) - fp->script->code);
143 }
144 #endif
145
146 static JS_INLINE jsval *
147 StackBase(JSStackFrame *fp)
148 {
149 return fp->slots + fp->script->nfixed;
150 }
151
152 #ifdef __cplusplus /* Aargh, LiveConnect, bug 442399. */
153 void
154 JSStackFrame::assertValidStackDepth(uintN depth)
155 {
156 JS_ASSERT(0 <= regs->sp - StackBase(this));
157 JS_ASSERT(depth <= uintptr_t(regs->sp - StackBase(this)));
158 }
159 #endif
160
161 static JS_INLINE uintN
162 GlobalVarCount(JSStackFrame *fp)
163 {
164 uintN n;
165
166 JS_ASSERT(!fp->fun);
167 n = fp->script->nfixed;
168 if (fp->script->regexpsOffset != 0)
169 n -= JS_SCRIPT_REGEXPS(fp->script)->length;
170 return n;
171 }
172
173 typedef struct JSInlineFrame {
174 JSStackFrame frame; /* base struct */
175 JSFrameRegs callerRegs; /* parent's frame registers */
176 void *mark; /* mark before inline frame */
177 void *hookData; /* debugger call hook data */
178 JSVersion callerVersion; /* dynamic version of calling script */
179 } JSInlineFrame;
180
181 /* JS stack frame flags. */
182 #define JSFRAME_CONSTRUCTING 0x01 /* frame is for a constructor invocation */
183 #define JSFRAME_COMPUTED_THIS 0x02 /* frame.thisp was computed already */
184 #define JSFRAME_ASSIGNING 0x04 /* a complex (not simplex JOF_ASSIGNING) op
185 is currently assigning to a property */
186 #define JSFRAME_DEBUGGER 0x08 /* frame for JS_EvaluateInStackFrame */
187 #define JSFRAME_EVAL 0x10 /* frame for obj_eval */
188 #define JSFRAME_ROOTED_ARGV 0x20 /* frame.argv is rooted by the caller */
189 #define JSFRAME_YIELDING 0x40 /* js_Interpret dispatched JSOP_YIELD */
190 #define JSFRAME_ITERATOR 0x80 /* trying to get an iterator for for-in */
191 #define JSFRAME_GENERATOR 0x200 /* frame belongs to generator-iterator */
192
193 #define JSFRAME_OVERRIDE_SHIFT 24 /* override bit-set params; see jsfun.c */
194 #define JSFRAME_OVERRIDE_BITS 8
195
196 #define JSFRAME_SPECIAL (JSFRAME_DEBUGGER | JSFRAME_EVAL)
197
198 /*
199 * Property cache with structurally typed capabilities for invalidation, for
200 * polymorphic callsite method/get/set speedups.
201 *
202 * See bug https://bugzilla.mozilla.org/show_bug.cgi?id=365851.
203 */
204 #define PROPERTY_CACHE_LOG2 12
205 #define PROPERTY_CACHE_SIZE JS_BIT(PROPERTY_CACHE_LOG2)
206 #define PROPERTY_CACHE_MASK JS_BITMASK(PROPERTY_CACHE_LOG2)
207
208 /*
209 * Add kshape rather than xor it to avoid collisions between nearby bytecode
210 * that are evolving an object by setting successive properties, incrementing
211 * the object's scope->shape on each set.
212 */
213 #define PROPERTY_CACHE_HASH(pc,kshape) \
214 (((((jsuword)(pc) >> PROPERTY_CACHE_LOG2) ^ (jsuword)(pc)) + (kshape)) & \
215 PROPERTY_CACHE_MASK)
216
217 #define PROPERTY_CACHE_HASH_PC(pc,kshape) \
218 PROPERTY_CACHE_HASH(pc, kshape)
219
220 #define PROPERTY_CACHE_HASH_ATOM(atom,obj,pobj) \
221 PROPERTY_CACHE_HASH((jsuword)(atom) >> 2, OBJ_SHAPE(obj))
222
223 /*
224 * Property cache value capability macros.
225 */
226 #define PCVCAP_PROTOBITS 4
227 #define PCVCAP_PROTOSIZE JS_BIT(PCVCAP_PROTOBITS)
228 #define PCVCAP_PROTOMASK JS_BITMASK(PCVCAP_PROTOBITS)
229
230 #define PCVCAP_SCOPEBITS 4
231 #define PCVCAP_SCOPESIZE JS_BIT(PCVCAP_SCOPEBITS)
232 #define PCVCAP_SCOPEMASK JS_BITMASK(PCVCAP_SCOPEBITS)
233
234 #define PCVCAP_TAGBITS (PCVCAP_PROTOBITS + PCVCAP_SCOPEBITS)
235 #define PCVCAP_TAGMASK JS_BITMASK(PCVCAP_TAGBITS)
236 #define PCVCAP_TAG(t) ((t) & PCVCAP_TAGMASK)
237
238 #define PCVCAP_MAKE(t,s,p) ((uint32(t) << PCVCAP_TAGBITS) | \
239 ((s) << PCVCAP_PROTOBITS) | \
240 (p))
241 #define PCVCAP_SHAPE(t) ((t) >> PCVCAP_TAGBITS)
242
243 #define SHAPE_OVERFLOW_BIT JS_BIT(32 - PCVCAP_TAGBITS)
244
245 #ifndef JS_THREADSAFE
246 # define js_GenerateShape(cx, gcLocked) js_GenerateShape (cx)
247 #endif
248
249 extern uint32
250 js_GenerateShape(JSContext *cx, JSBool gcLocked);
251
252 struct JSPropCacheEntry {
253 jsbytecode *kpc; /* pc if vcap tag is <= 1, else atom */
254 jsuword kshape; /* key shape if pc, else obj for atom */
255 jsuword vcap; /* value capability, see above */
256 jsuword vword; /* value word, see PCVAL_* below */
257 };
258
259 /*
260 * Special value for functions returning JSPropCacheEntry * to distinguish
261 * between failure and no no-cache-fill cases.
262 */
263 #define JS_NO_PROP_CACHE_FILL ((JSPropCacheEntry *) NULL + 1)
264
265 #if defined DEBUG_brendan || defined DEBUG_brendaneich
266 #define JS_PROPERTY_CACHE_METERING 1
267 #endif
268
269 typedef struct JSPropertyCache {
270 JSPropCacheEntry table[PROPERTY_CACHE_SIZE];
271 JSBool empty;
272 #ifdef JS_PROPERTY_CACHE_METERING
273 JSPropCacheEntry *pctestentry; /* entry of the last PC-based test */
274 uint32 fills; /* number of cache entry fills */
275 uint32 nofills; /* couldn't fill (e.g. default get) */
276 uint32 rofills; /* set on read-only prop can't fill */
277 uint32 disfills; /* fill attempts on disabled cache */
278 uint32 oddfills; /* fill attempt after setter deleted */
279 uint32 modfills; /* fill that rehashed to a new entry */
280 uint32 brandfills; /* scope brandings to type structural
281 method fills */
282 uint32 noprotos; /* resolve-returned non-proto pobj */
283 uint32 longchains; /* overlong scope and/or proto chain */
284 uint32 recycles; /* cache entries recycled by fills */
285 uint32 pcrecycles; /* pc-keyed entries recycled by atom-
286 keyed fills */
287 uint32 tests; /* cache probes */
288 uint32 pchits; /* fast-path polymorphic op hits */
289 uint32 protopchits; /* pchits hitting immediate prototype */
290 uint32 initests; /* cache probes from JSOP_INITPROP */
291 uint32 inipchits; /* init'ing next property pchit case */
292 uint32 inipcmisses; /* init'ing next property pc misses */
293 uint32 settests; /* cache probes from JOF_SET opcodes */
294 uint32 addpchits; /* adding next property pchit case */
295 uint32 setpchits; /* setting existing property pchit */
296 uint32 setpcmisses; /* setting/adding property pc misses */
297 uint32 slotchanges; /* clasp->reserveSlots result variance-
298 induced slot changes */
299 uint32 setmisses; /* JSOP_SET{NAME,PROP} total misses */
300 uint32 idmisses; /* slow-path key id == atom misses */
301 uint32 komisses; /* slow-path key object misses */
302 uint32 vcmisses; /* value capability misses */
303 uint32 misses; /* cache misses */
304 uint32 flushes; /* cache flushes */
305 uint32 pcpurges; /* shadowing purges on proto chain */
306 # define PCMETER(x) x
307 #else
308 # define PCMETER(x) ((void)0)
309 #endif
310 } JSPropertyCache;
311
312 /*
313 * Property cache value tagging/untagging macros.
314 */
315 #define PCVAL_OBJECT 0
316 #define PCVAL_SLOT 1
317 #define PCVAL_SPROP 2
318
319 #define PCVAL_TAGBITS 2
320 #define PCVAL_TAGMASK JS_BITMASK(PCVAL_TAGBITS)
321 #define PCVAL_TAG(v) ((v) & PCVAL_TAGMASK)
322 #define PCVAL_CLRTAG(v) ((v) & ~(jsuword)PCVAL_TAGMASK)
323 #define PCVAL_SETTAG(v,t) ((jsuword)(v) | (t))
324
325 #define PCVAL_NULL 0
326 #define PCVAL_IS_NULL(v) ((v) == PCVAL_NULL)
327
328 #define PCVAL_IS_OBJECT(v) (PCVAL_TAG(v) == PCVAL_OBJECT)
329 #define PCVAL_TO_OBJECT(v) ((JSObject *) (v))
330 #define OBJECT_TO_PCVAL(obj) ((jsuword) (obj))
331
332 #define PCVAL_OBJECT_TO_JSVAL(v) OBJECT_TO_JSVAL(PCVAL_TO_OBJECT(v))
333 #define JSVAL_OBJECT_TO_PCVAL(v) OBJECT_TO_PCVAL(JSVAL_TO_OBJECT(v))
334
335 #define PCVAL_IS_SLOT(v) ((v) & PCVAL_SLOT)
336 #define PCVAL_TO_SLOT(v) ((jsuint)(v) >> 1)
337 #define SLOT_TO_PCVAL(i) (((jsuword)(i) << 1) | PCVAL_SLOT)
338
339 #define PCVAL_IS_SPROP(v) (PCVAL_TAG(v) == PCVAL_SPROP)
340 #define PCVAL_TO_SPROP(v) ((JSScopeProperty *) PCVAL_CLRTAG(v))
341 #define SPROP_TO_PCVAL(sprop) PCVAL_SETTAG(sprop, PCVAL_SPROP)
342
343 /*
344 * Fill property cache entry for key cx->fp->pc, optimized value word computed
345 * from obj and sprop, and entry capability forged from 24-bit OBJ_SHAPE(obj),
346 * 4-bit scopeIndex, and 4-bit protoIndex.
347 *
348 * Return the filled cache entry or JS_NO_PROP_CACHE_FILL if caching was not
349 * possible.
350 */
351 extern JS_REQUIRES_STACK JSPropCacheEntry *
352 js_FillPropertyCache(JSContext *cx, JSObject *obj,
353 uintN scopeIndex, uintN protoIndex, JSObject *pobj,
354 JSScopeProperty *sprop, JSBool adding);
355
356 /*
357 * Property cache lookup macros. PROPERTY_CACHE_TEST is designed to inline the
358 * fast path in js_Interpret, so it makes "just-so" restrictions on parameters,
359 * e.g. pobj and obj should not be the same variable, since for JOF_PROP-mode
360 * opcodes, obj must not be changed because of a cache miss.
361 *
362 * On return from PROPERTY_CACHE_TEST, if atom is null then obj points to the
363 * scope chain element in which the property was found, pobj is locked, and
364 * entry is valid. If atom is non-null then no object is locked but entry is
365 * still set correctly for use, e.g., by js_FillPropertyCache and atom should
366 * be used as the id to find.
367 *
368 * We must lock pobj on a hit in order to close races with threads that might
369 * be deleting a property from its scope, or otherwise invalidating property
370 * caches (on all threads) by re-generating scope->shape.
371 */
372 #define PROPERTY_CACHE_TEST(cx, pc, obj, pobj, entry, atom) \
373 do { \
374 JSPropertyCache *cache_ = &JS_PROPERTY_CACHE(cx); \
375 uint32 kshape_ = (JS_ASSERT(OBJ_IS_NATIVE(obj)), OBJ_SHAPE(obj)); \
376 entry = &cache_->table[PROPERTY_CACHE_HASH_PC(pc, kshape_)]; \
377 PCMETER(cache_->pctestentry = entry); \
378 PCMETER(cache_->tests++); \
379 JS_ASSERT(&obj != &pobj); \
380 if (entry->kpc == pc && entry->kshape == kshape_) { \
381 JSObject *tmp_; \
382 pobj = obj; \
383 JS_LOCK_OBJ(cx, pobj); \
384 JS_ASSERT(PCVCAP_TAG(entry->vcap) <= 1); \
385 if (PCVCAP_TAG(entry->vcap) == 1 && \
386 (tmp_ = LOCKED_OBJ_GET_PROTO(pobj)) != NULL && \
387 OBJ_IS_NATIVE(tmp_)) { \
388 JS_UNLOCK_OBJ(cx, pobj); \
389 pobj = tmp_; \
390 JS_LOCK_OBJ(cx, pobj); \
391 } \
392 if (PCVCAP_SHAPE(entry->vcap) == OBJ_SHAPE(pobj)) { \
393 PCMETER(cache_->pchits++); \
394 PCMETER(!PCVCAP_TAG(entry->vcap) || cache_->protopchits++); \
395 pobj = OBJ_SCOPE(pobj)->object; \
396 atom = NULL; \
397 break; \
398 } \
399 JS_UNLOCK_OBJ(cx, pobj); \
400 } \
401 atom = js_FullTestPropertyCache(cx, pc, &obj, &pobj, &entry); \
402 if (atom) \
403 PCMETER(cache_->misses++); \
404 } while (0)
405
406 extern JS_REQUIRES_STACK JSAtom *
407 js_FullTestPropertyCache(JSContext *cx, jsbytecode *pc,
408 JSObject **objp, JSObject **pobjp,
409 JSPropCacheEntry **entryp);
410
411 /* The property cache does not need a destructor. */
412 #define js_FinishPropertyCache(cache) ((void) 0)
413
414 extern void
415 js_PurgePropertyCache(JSContext *cx, JSPropertyCache *cache);
416
417 extern void
418 js_PurgePropertyCacheForScript(JSContext *cx, JSScript *script);
419
420 /*
421 * Interpreter stack arena-pool alloc and free functions.
422 */
423 extern JS_REQUIRES_STACK JS_FRIEND_API(jsval *)
424 js_AllocStack(JSContext *cx, uintN nslots, void **markp);
425
426 extern JS_REQUIRES_STACK JS_FRIEND_API(void)
427 js_FreeStack(JSContext *cx, void *mark);
428
429 /*
430 * Refresh and return fp->scopeChain. It may be stale if block scopes are
431 * active but not yet reflected by objects in the scope chain. If a block
432 * scope contains a with, eval, XML filtering predicate, or similar such
433 * dynamically scoped construct, then compile-time block scope at fp->blocks
434 * must reflect at runtime.
435 */
436 extern JSObject *
437 js_GetScopeChain(JSContext *cx, JSStackFrame *fp);
438
439 /*
440 * Given a context and a vector of [callee, this, args...] for a function that
441 * was specified with a JSFUN_THISP_PRIMITIVE flag, get the primitive value of
442 * |this| into *thisvp. In doing so, if |this| is an object, insist it is an
443 * instance of clasp and extract its private slot value to return via *thisvp.
444 *
445 * NB: this function loads and uses *vp before storing *thisvp, so the two may
446 * alias the same jsval.
447 */
448 extern JSBool
449 js_GetPrimitiveThis(JSContext *cx, jsval *vp, JSClass *clasp, jsval *thisvp);
450
451 /*
452 * For a call with arguments argv including argv[-1] (nominal |this|) and
453 * argv[-2] (callee) replace null |this| with callee's parent, replace
454 * primitive values with the equivalent wrapper objects and censor activation
455 * objects as, per ECMA-262, they may not be referred to by |this|. argv[-1]
456 * must not be a JSVAL_VOID.
457 */
458 extern JSObject *
459 js_ComputeThis(JSContext *cx, JSBool lazy, jsval *argv);
460
461 extern const uint16 js_PrimitiveTestFlags[];
462
463 #define PRIMITIVE_THIS_TEST(fun,thisv) \
464 (JS_ASSERT(!JSVAL_IS_VOID(thisv)), \
465 JSFUN_THISP_TEST(JSFUN_THISP_FLAGS((fun)->flags), \
466 js_PrimitiveTestFlags[JSVAL_TAG(thisv) - 1]))
467
468 #ifdef __cplusplus /* Aargh, libgjs, bug 492720. */
469 static JS_INLINE JSObject *
470 js_ComputeThisForFrame(JSContext *cx, JSStackFrame *fp)
471 {
472 JSObject* obj;
473 if (fp->flags & JSFRAME_COMPUTED_THIS)
474 return fp->thisp;
475 obj = js_ComputeThis(cx, JS_TRUE, fp->argv);
476 if (!obj)
477 return NULL;
478 fp->thisp = obj;
479 fp->flags |= JSFRAME_COMPUTED_THIS;
480 return obj;
481 }
482 #endif
483
484 /*
485 * NB: js_Invoke requires that cx is currently running JS (i.e., that cx->fp
486 * is non-null), and that vp points to the callee, |this| parameter, and
487 * actual arguments of the call. [vp .. vp + 2 + argc) must belong to the last
488 * JS stack segment that js_AllocStack allocated. The function may use the
489 * space available after vp + 2 + argc in the stack segment for temporaries,
490 * so the caller should not use that space for values that must be preserved
491 * across the call.
492 */
493 extern JS_REQUIRES_STACK JS_FRIEND_API(JSBool)
494 js_Invoke(JSContext *cx, uintN argc, jsval *vp, uintN flags);
495
496 /*
497 * Consolidated js_Invoke flags simply rename certain JSFRAME_* flags, so that
498 * we can share bits stored in JSStackFrame.flags and passed to:
499 *
500 * js_Invoke
501 * js_InternalInvoke
502 * js_ValueToFunction
503 * js_ValueToFunctionObject
504 * js_ValueToCallableObject
505 * js_ReportIsNotFunction
506 *
507 * See jsfun.h for the latter four and flag renaming macros.
508 */
509 #define JSINVOKE_CONSTRUCT JSFRAME_CONSTRUCTING
510 #define JSINVOKE_ITERATOR JSFRAME_ITERATOR
511
512 /*
513 * Mask to isolate construct and iterator flags for use with jsfun.h functions.
514 */
515 #define JSINVOKE_FUNFLAGS (JSINVOKE_CONSTRUCT | JSINVOKE_ITERATOR)
516
517 /*
518 * "Internal" calls may come from C or C++ code using a JSContext on which no
519 * JS is running (!cx->fp), so they may need to push a dummy JSStackFrame.
520 */
521 #define js_InternalCall(cx,obj,fval,argc,argv,rval) \
522 js_InternalInvoke(cx, obj, fval, 0, argc, argv, rval)
523
524 #define js_InternalConstruct(cx,obj,fval,argc,argv,rval) \
525 js_InternalInvoke(cx, obj, fval, JSINVOKE_CONSTRUCT, argc, argv, rval)
526
527 extern JSBool
528 js_InternalInvoke(JSContext *cx, JSObject *obj, jsval fval, uintN flags,
529 uintN argc, jsval *argv, jsval *rval);
530
531 extern JSBool
532 js_InternalGetOrSet(JSContext *cx, JSObject *obj, jsid id, jsval fval,
533 JSAccessMode mode, uintN argc, jsval *argv, jsval *rval);
534
535 extern JS_FORCES_STACK JSBool
536 js_Execute(JSContext *cx, JSObject *chain, JSScript *script,
537 JSStackFrame *down, uintN flags, jsval *result);
538
539 extern JS_REQUIRES_STACK JSBool
540 js_InvokeConstructor(JSContext *cx, uintN argc, JSBool clampReturn, jsval *vp);
541
542 extern JS_REQUIRES_STACK JSBool
543 js_Interpret(JSContext *cx);
544
545 #define JSPROP_INITIALIZER 0x100 /* NB: Not a valid property attribute. */
546
547 extern JSBool
548 js_CheckRedeclaration(JSContext *cx, JSObject *obj, jsid id, uintN attrs,
549 JSObject **objp, JSProperty **propp);
550
551 extern JSBool
552 js_StrictlyEqual(JSContext *cx, jsval lval, jsval rval);
553
554 extern JSBool
555 js_InternNonIntElementId(JSContext *cx, JSObject *obj, jsval idval, jsid *idp);
556
557 /* Work around liveconnect building this file as C on 1.9.1 branch */
558 #ifdef __cplusplus
559
560 /*
561 * Given an active context, a static scope level, and an upvar cookie, return
562 * the value of the upvar.
563 */
564 extern jsval&
565 js_GetUpvar(JSContext *cx, uintN level, uintN cookie);
566
567 #endif
568
569 /*
570 * JS_LONE_INTERPRET indicates that the compiler should see just the code for
571 * the js_Interpret function when compiling jsinterp.cpp. The rest of the code
572 * from the file should be visible only when compiling jsinvoke.cpp. It allows
573 * platform builds to optimize selectively js_Interpret when the granularity
574 * of the optimizations with the given compiler is a compilation unit.
575 *
576 * JS_STATIC_INTERPRET is the modifier for functions defined in jsinterp.cpp
577 * that only js_Interpret calls. When JS_LONE_INTERPRET is true all such
578 * functions are declared below.
579 */
580 #ifndef JS_LONE_INTERPRET
581 # ifdef _MSC_VER
582 # define JS_LONE_INTERPRET 0
583 # else
584 # define JS_LONE_INTERPRET 1
585 # endif
586 #endif
587
588 #if !JS_LONE_INTERPRET
589 # define JS_STATIC_INTERPRET static
590 #else
591 # define JS_STATIC_INTERPRET
592
593 extern JS_REQUIRES_STACK jsval *
594 js_AllocRawStack(JSContext *cx, uintN nslots, void **markp);
595
596 extern JS_REQUIRES_STACK void
597 js_FreeRawStack(JSContext *cx, void *mark);
598
599 /*
600 * ECMA requires "the global object", but in embeddings such as the browser,
601 * which have multiple top-level objects (windows, frames, etc. in the DOM),
602 * we prefer fun's parent. An example that causes this code to run:
603 *
604 * // in window w1
605 * function f() { return this }
606 * function g() { return f }
607 *
608 * // in window w2
609 * var h = w1.g()
610 * alert(h() == w1)
611 *
612 * The alert should display "true".
613 */
614 extern JSObject *
615 js_ComputeGlobalThis(JSContext *cx, JSBool lazy, jsval *argv);
616
617 extern JS_REQUIRES_STACK JSBool
618 js_EnterWith(JSContext *cx, jsint stackIndex);
619
620 extern JS_REQUIRES_STACK void
621 js_LeaveWith(JSContext *cx);
622
623 extern JS_REQUIRES_STACK JSClass *
624 js_IsActiveWithOrBlock(JSContext *cx, JSObject *obj, int stackDepth);
625
626 /*
627 * Unwind block and scope chains to match the given depth. The function sets
628 * fp->sp on return to stackDepth.
629 */
630 extern JS_REQUIRES_STACK JSBool
631 js_UnwindScope(JSContext *cx, JSStackFrame *fp, jsint stackDepth,
632 JSBool normalUnwind);
633
634 extern JSBool
635 js_OnUnknownMethod(JSContext *cx, jsval *vp);
636
637 /*
638 * Find the results of incrementing or decrementing *vp. For pre-increments,
639 * both *vp and *vp2 will contain the result on return. For post-increments,
640 * vp will contain the original value converted to a number and vp2 will get
641 * the result. Both vp and vp2 must be roots.
642 */
643 extern JSBool
644 js_DoIncDec(JSContext *cx, const JSCodeSpec *cs, jsval *vp, jsval *vp2);
645
646 /*
647 * Opcode tracing helper. When len is not 0, cx->fp->regs->pc[-len] gives the
648 * previous opcode.
649 */
650 extern JS_REQUIRES_STACK void
651 js_TraceOpcode(JSContext *cx);
652
653 /*
654 * JS_OPMETER helper functions.
655 */
656 extern void
657 js_MeterOpcodePair(JSOp op1, JSOp op2);
658
659 extern void
660 js_MeterSlotOpcode(JSOp op, uint32 slot);
661
662 #endif /* JS_LONE_INTERPRET */
663
664 JS_END_EXTERN_C
665
666 #endif /* jsinterp_h___ */

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