trunk/js/jsscript.h

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 * vim: set ts=8 sw=4 et tw=79 ft=cpp:
 *
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Communicator client code, released
 * March 31, 1998.
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#ifndef jsscript_h___
#define jsscript_h___
/*
 * JS script descriptor.
 */
#include "jsatom.h"
#include "jsprvtd.h"

JS_BEGIN_EXTERN_C

/*
 * Type of try note associated with each catch or finally block, and also with
 * for-in loops.
 */
typedef enum JSTryNoteKind {
    JSTN_CATCH,
    JSTN_FINALLY,
    JSTN_ITER
} JSTryNoteKind;

/*
 * Exception handling record.
 */
struct JSTryNote {
    uint8           kind;       /* one of JSTryNoteKind */
    uint8           padding;    /* explicit padding on uint16 boundary */
    uint16          stackDepth; /* stack depth upon exception handler entry */
    uint32          start;      /* start of the try statement or for-in loop
                                   relative to script->main */
    uint32          length;     /* length of the try statement or for-in loop */
};

typedef struct JSTryNoteArray {
    JSTryNote       *vector;    /* array of indexed try notes */
    uint32          length;     /* count of indexed try notes */
} JSTryNoteArray;

typedef struct JSObjectArray {
    JSObject        **vector;   /* array of indexed objects */
    uint32          length;     /* count of indexed objects */
} JSObjectArray;

typedef struct JSUpvarArray {
    uint32          *vector;    /* array of indexed upvar cookies */
    uint32          length;     /* count of indexed upvar cookies */
} JSUpvarArray;

#define MAKE_UPVAR_COOKIE(skip,slot)    ((skip) << 16 | (slot))
#define UPVAR_FRAME_SKIP(cookie)        ((uint32)(cookie) >> 16)
#define UPVAR_FRAME_SLOT(cookie)        ((uint16)(cookie))

#define JS_OBJECT_ARRAY_SIZE(length)                                          \
    (offsetof(JSObjectArray, vector) + sizeof(JSObject *) * (length))

#if defined DEBUG && defined JS_THREADSAFE
# define CHECK_SCRIPT_OWNER 1
#endif

struct JSScript {
    jsbytecode      *code;      /* bytecodes and their immediate operands */
    uint32          length;     /* length of code vector */
    uint16          version;    /* JS version under which script was compiled */
    uint16          nfixed;     /* number of slots besides stack operands in
                                   slot array */
    uint8           objectsOffset;  /* offset to the array of nested function,
                                       block, scope, xml and one-time regexps
                                       objects or 0 if none */
    uint8           upvarsOffset;   /* offset of the array of display ("up")
                                       closure vars or 0 if none */
    uint8           regexpsOffset;  /* offset to the array of to-be-cloned
                                       regexps or 0 if none. */
    uint8           trynotesOffset; /* offset to the array of try notes or
                                       0 if none */
    uint8           flags;      /* see below */
    jsbytecode      *main;      /* main entry point, after predef'ing prolog */
    JSAtomMap       atomMap;    /* maps immediate index to literal struct */
    const char      *filename;  /* source filename or null */
    uint32          lineno;     /* base line number of script */
    uint16          nslots;     /* vars plus maximum stack depth */
    uint16          staticDepth;/* static depth for display maintenance */
    JSPrincipals    *principals;/* principals for this script */
    union {
        JSObject    *object;    /* optional Script-class object wrapper */
        JSScript    *nextToGC;  /* next to GC in rt->scriptsToGC list */
    } u;
#ifdef CHECK_SCRIPT_OWNER
    JSThread        *owner;     /* for thread-safe life-cycle assertions */
#endif
};

#define JSSF_NO_SCRIPT_RVAL     0x01    /* no need for result value of last
                                           expression statement */

static JS_INLINE uintN
StackDepth(JSScript *script)
{
    return script->nslots - script->nfixed;
}

/* No need to store script->notes now that it is allocated right after code. */
#define SCRIPT_NOTES(script)    ((jssrcnote*)((script)->code+(script)->length))

#define JS_SCRIPT_OBJECTS(script)                                             \
    (JS_ASSERT((script)->objectsOffset != 0),                                 \
     (JSObjectArray *)((uint8 *)(script) + (script)->objectsOffset))

#define JS_SCRIPT_UPVARS(script)                                              \
    (JS_ASSERT((script)->upvarsOffset != 0),                                  \
     (JSUpvarArray *)((uint8 *)(script) + (script)->upvarsOffset))

#define JS_SCRIPT_REGEXPS(script)                                             \
    (JS_ASSERT((script)->regexpsOffset != 0),                                 \
     (JSObjectArray *)((uint8 *)(script) + (script)->regexpsOffset))

#define JS_SCRIPT_TRYNOTES(script)                                            \
    (JS_ASSERT((script)->trynotesOffset != 0),                                \
     (JSTryNoteArray *)((uint8 *)(script) + (script)->trynotesOffset))

#define JS_GET_SCRIPT_ATOM(script, index, atom)                               \
    JS_BEGIN_MACRO                                                            \
        JSAtomMap *atoms_ = &(script)->atomMap;                               \
        JS_ASSERT((uint32)(index) < atoms_->length);                          \
        (atom) = atoms_->vector[(index)];                                     \
    JS_END_MACRO

#define JS_GET_SCRIPT_OBJECT(script, index, obj)                              \
    JS_BEGIN_MACRO                                                            \
        JSObjectArray *objects_ = JS_SCRIPT_OBJECTS(script);                  \
        JS_ASSERT((uint32)(index) < objects_->length);                        \
        (obj) = objects_->vector[(index)];                                    \
    JS_END_MACRO

#define JS_GET_SCRIPT_FUNCTION(script, index, fun)                            \
    JS_BEGIN_MACRO                                                            \
        JSObject *funobj_;                                                    \
                                                                              \
        JS_GET_SCRIPT_OBJECT(script, index, funobj_);                         \
        JS_ASSERT(HAS_FUNCTION_CLASS(funobj_));                               \
        JS_ASSERT(funobj_ == (JSObject *) STOBJ_GET_PRIVATE(funobj_));        \
        (fun) = (JSFunction *) funobj_;                                       \
        JS_ASSERT(FUN_INTERPRETED(fun));                                      \
    JS_END_MACRO

#define JS_GET_SCRIPT_REGEXP(script, index, obj)                              \
    JS_BEGIN_MACRO                                                            \
        JSObjectArray *regexps_ = JS_SCRIPT_REGEXPS(script);                  \
        JS_ASSERT((uint32)(index) < regexps_->length);                        \
        (obj) = regexps_->vector[(index)];                                    \
        JS_ASSERT(STOBJ_GET_CLASS(obj) == &js_RegExpClass);                   \
    JS_END_MACRO

/*
 * Check if pc is inside a try block that has finally code. GC calls this to
 * check if it is necessary to schedule generator.close() invocation for an
 * unreachable generator.
 */
JSBool
js_IsInsideTryWithFinally(JSScript *script, jsbytecode *pc);

extern JS_FRIEND_DATA(JSClass) js_ScriptClass;

extern JSObject *
js_InitScriptClass(JSContext *cx, JSObject *obj);

/*
 * On first new context in rt, initialize script runtime state, specifically
 * the script filename table and its lock.
 */
extern JSBool
js_InitRuntimeScriptState(JSRuntime *rt);

/*
 * On last context destroy for rt, if script filenames are all GC'd, free the
 * script filename table and its lock.
 */
extern void
js_FinishRuntimeScriptState(JSRuntime *rt);

/*
 * On JS_DestroyRuntime(rt), forcibly free script filename prefixes and any
 * script filename table entries that have not been GC'd, the latter using
 * js_FinishRuntimeScriptState.
 *
 * This allows script filename prefixes to outlive any context in rt.
 */
extern void
js_FreeRuntimeScriptState(JSRuntime *rt);

extern const char *
js_SaveScriptFilename(JSContext *cx, const char *filename);

extern const char *
js_SaveScriptFilenameRT(JSRuntime *rt, const char *filename, uint32 flags);

extern uint32
js_GetScriptFilenameFlags(const char *filename);

extern void
js_MarkScriptFilename(const char *filename);

extern void
js_MarkScriptFilenames(JSRuntime *rt, JSBool keepAtoms);

extern void
js_SweepScriptFilenames(JSRuntime *rt);

/*
 * Two successively less primitive ways to make a new JSScript.  The first
 * does *not* call a non-null cx->runtime->newScriptHook -- only the second,
 * js_NewScriptFromCG, calls this optional debugger hook.
 *
 * The js_NewScript function can't know whether the script it creates belongs
 * to a function, or is top-level or eval code, but the debugger wants access
 * to the newly made script's function, if any -- so callers of js_NewScript
 * are responsible for notifying the debugger after successfully creating any
 * kind (function or other) of new JSScript.
 */
extern JSScript *
js_NewScript(JSContext *cx, uint32 length, uint32 nsrcnotes, uint32 natoms,
             uint32 nobjects, uint32 nupvars, uint32 nregexps,
             uint32 ntrynotes);

extern JSScript *
js_NewScriptFromCG(JSContext *cx, JSCodeGenerator *cg);

/*
 * New-script-hook calling is factored from js_NewScriptFromCG so that it
 * and callers of js_XDRScript can share this code.  In the case of callers
 * of js_XDRScript, the hook should be invoked only after successful decode
 * of any owning function (the fun parameter) or script object (null fun).
 */
extern JS_FRIEND_API(void)
js_CallNewScriptHook(JSContext *cx, JSScript *script, JSFunction *fun);

extern JS_FRIEND_API(void)
js_CallDestroyScriptHook(JSContext *cx, JSScript *script);

extern void
js_DestroyScript(JSContext *cx, JSScript *script);

extern void
js_TraceScript(JSTracer *trc, JSScript *script);

/*
 * To perturb as little code as possible, we introduce a js_GetSrcNote lookup
 * cache without adding an explicit cx parameter.  Thus js_GetSrcNote becomes
 * a macro that uses cx from its calls' lexical environments.
 */
#define js_GetSrcNote(script,pc) js_GetSrcNoteCached(cx, script, pc)

extern jssrcnote *
js_GetSrcNoteCached(JSContext *cx, JSScript *script, jsbytecode *pc);

/* XXX need cx to lock function objects declared by prolog bytecodes. */
extern uintN
js_PCToLineNumber(JSContext *cx, JSScript *script, jsbytecode *pc);

extern jsbytecode *
js_LineNumberToPC(JSScript *script, uintN lineno);

extern JS_FRIEND_API(uintN)
js_GetScriptLineExtent(JSScript *script);

/*
 * If magic is non-null, js_XDRScript succeeds on magic number mismatch but
 * returns false in *magic; it reflects a match via a true *magic out param.
 * If magic is null, js_XDRScript returns false on bad magic number errors,
 * which it reports.
 *
 * NB: callers must call js_CallNewScriptHook after successful JSXDR_DECODE
 * and subsequent set-up of owning function or script object, if any.
 */
extern JSBool
js_XDRScript(JSXDRState *xdr, JSScript **scriptp, JSBool *magic);

JS_END_EXTERN_C

#endif /* jsscript_h___ */
1	/* -- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 --
2	* vim: set ts=8 sw=4 et tw=79 ft=cpp:
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 jsscript_h___
42	#define jsscript_h___
43	/*
44	* JS script descriptor.
45	*/
46	#include "jsatom.h"
47	#include "jsprvtd.h"
48
49	JS_BEGIN_EXTERN_C
50
51	/*
52	* Type of try note associated with each catch or finally block, and also with
53	* for-in loops.
54	*/
55	typedef enum JSTryNoteKind {
56	JSTN_CATCH,
57	JSTN_FINALLY,
58	JSTN_ITER
59	} JSTryNoteKind;
60
61	/*
62	* Exception handling record.
63	*/
64	struct JSTryNote {
65	uint8 kind; /* one of JSTryNoteKind */
66	uint8 padding; /* explicit padding on uint16 boundary */
67	uint16 stackDepth; /* stack depth upon exception handler entry */
68	uint32 start; /* start of the try statement or for-in loop
69	relative to script->main */
70	uint32 length; /* length of the try statement or for-in loop */
71	};
72
73	typedef struct JSTryNoteArray {
74	JSTryNote vector; / array of indexed try notes */
75	uint32 length; /* count of indexed try notes */
76	} JSTryNoteArray;
77
78	typedef struct JSObjectArray {
79	JSObject *vector; / array of indexed objects */
80	uint32 length; /* count of indexed objects */
81	} JSObjectArray;
82
83	typedef struct JSUpvarArray {
84	uint32 vector; / array of indexed upvar cookies */
85	uint32 length; /* count of indexed upvar cookies */
86	} JSUpvarArray;
87
88	#define MAKE_UPVAR_COOKIE(skip,slot) ((skip) << 16 \| (slot))
89	#define UPVAR_FRAME_SKIP(cookie) ((uint32)(cookie) >> 16)
90	#define UPVAR_FRAME_SLOT(cookie) ((uint16)(cookie))
91
92	#define JS_OBJECT_ARRAY_SIZE(length) \
93	(offsetof(JSObjectArray, vector) + sizeof(JSObject ) (length))
94
95	#if defined DEBUG && defined JS_THREADSAFE
96	# define CHECK_SCRIPT_OWNER 1
97	#endif
98
99	struct JSScript {
100	jsbytecode code; / bytecodes and their immediate operands */
101	uint32 length; /* length of code vector */
102	uint16 version; /* JS version under which script was compiled */
103	uint16 nfixed; /* number of slots besides stack operands in
104	slot array */
105	uint8 objectsOffset; /* offset to the array of nested function,
106	block, scope, xml and one-time regexps
107	objects or 0 if none */
108	uint8 upvarsOffset; /* offset of the array of display ("up")
109	closure vars or 0 if none */
110	uint8 regexpsOffset; /* offset to the array of to-be-cloned
111	regexps or 0 if none. */
112	uint8 trynotesOffset; /* offset to the array of try notes or
113	0 if none */
114	uint8 flags; /* see below */
115	jsbytecode main; / main entry point, after predef'ing prolog */
116	JSAtomMap atomMap; /* maps immediate index to literal struct */
117	const char filename; / source filename or null */
118	uint32 lineno; /* base line number of script */
119	uint16 nslots; /* vars plus maximum stack depth */
120	uint16 staticDepth;/* static depth for display maintenance */
121	JSPrincipals principals;/ principals for this script */
122	union {
123	JSObject object; / optional Script-class object wrapper */
124	JSScript nextToGC; / next to GC in rt->scriptsToGC list */
125	} u;
126	#ifdef CHECK_SCRIPT_OWNER
127	JSThread owner; / for thread-safe life-cycle assertions */
128	#endif
129	};
130
131	#define JSSF_NO_SCRIPT_RVAL 0x01 /* no need for result value of last
132	expression statement */
133
134	static JS_INLINE uintN
135	StackDepth(JSScript *script)
136	{
137	return script->nslots - script->nfixed;
138	}
139
140	/* No need to store script->notes now that it is allocated right after code. */
141	#define SCRIPT_NOTES(script) ((jssrcnote*)((script)->code+(script)->length))
142
143	#define JS_SCRIPT_OBJECTS(script) \
144	(JS_ASSERT((script)->objectsOffset != 0), \
145	(JSObjectArray )((uint8 )(script) + (script)->objectsOffset))
146
147	#define JS_SCRIPT_UPVARS(script) \
148	(JS_ASSERT((script)->upvarsOffset != 0), \
149	(JSUpvarArray )((uint8 )(script) + (script)->upvarsOffset))
150
151	#define JS_SCRIPT_REGEXPS(script) \
152	(JS_ASSERT((script)->regexpsOffset != 0), \
153	(JSObjectArray )((uint8 )(script) + (script)->regexpsOffset))
154
155	#define JS_SCRIPT_TRYNOTES(script) \
156	(JS_ASSERT((script)->trynotesOffset != 0), \
157	(JSTryNoteArray )((uint8 )(script) + (script)->trynotesOffset))
158
159	#define JS_GET_SCRIPT_ATOM(script, index, atom) \
160	JS_BEGIN_MACRO \
161	JSAtomMap *atoms_ = &(script)->atomMap; \
162	JS_ASSERT((uint32)(index) < atoms_->length); \
163	(atom) = atoms_->vector[(index)]; \
164	JS_END_MACRO
165
166	#define JS_GET_SCRIPT_OBJECT(script, index, obj) \
167	JS_BEGIN_MACRO \
168	JSObjectArray *objects_ = JS_SCRIPT_OBJECTS(script); \
169	JS_ASSERT((uint32)(index) < objects_->length); \
170	(obj) = objects_->vector[(index)]; \
171	JS_END_MACRO
172
173	#define JS_GET_SCRIPT_FUNCTION(script, index, fun) \
174	JS_BEGIN_MACRO \
175	JSObject *funobj_; \
176	\
177	JS_GET_SCRIPT_OBJECT(script, index, funobj_); \
178	JS_ASSERT(HAS_FUNCTION_CLASS(funobj_)); \
179	JS_ASSERT(funobj_ == (JSObject *) STOBJ_GET_PRIVATE(funobj_)); \
180	(fun) = (JSFunction *) funobj_; \
181	JS_ASSERT(FUN_INTERPRETED(fun)); \
182	JS_END_MACRO
183
184	#define JS_GET_SCRIPT_REGEXP(script, index, obj) \
185	JS_BEGIN_MACRO \
186	JSObjectArray *regexps_ = JS_SCRIPT_REGEXPS(script); \
187	JS_ASSERT((uint32)(index) < regexps_->length); \
188	(obj) = regexps_->vector[(index)]; \
189	JS_ASSERT(STOBJ_GET_CLASS(obj) == &js_RegExpClass); \
190	JS_END_MACRO
191
192	/*
193	* Check if pc is inside a try block that has finally code. GC calls this to
194	* check if it is necessary to schedule generator.close() invocation for an
195	* unreachable generator.
196	*/
197	JSBool
198	js_IsInsideTryWithFinally(JSScript script, jsbytecode pc);
199
200	extern JS_FRIEND_DATA(JSClass) js_ScriptClass;
201
202	extern JSObject *
203	js_InitScriptClass(JSContext cx, JSObject obj);
204
205	/*
206	* On first new context in rt, initialize script runtime state, specifically
207	* the script filename table and its lock.
208	*/
209	extern JSBool
210	js_InitRuntimeScriptState(JSRuntime *rt);
211
212	/*
213	* On last context destroy for rt, if script filenames are all GC'd, free the
214	* script filename table and its lock.
215	*/
216	extern void
217	js_FinishRuntimeScriptState(JSRuntime *rt);
218
219	/*
220	* On JS_DestroyRuntime(rt), forcibly free script filename prefixes and any
221	* script filename table entries that have not been GC'd, the latter using
222	* js_FinishRuntimeScriptState.
223	*
224	* This allows script filename prefixes to outlive any context in rt.
225	*/
226	extern void
227	js_FreeRuntimeScriptState(JSRuntime *rt);
228
229	extern const char *
230	js_SaveScriptFilename(JSContext cx, const char filename);
231
232	extern const char *
233	js_SaveScriptFilenameRT(JSRuntime rt, const char filename, uint32 flags);
234
235	extern uint32
236	js_GetScriptFilenameFlags(const char *filename);
237
238	extern void
239	js_MarkScriptFilename(const char *filename);
240
241	extern void
242	js_MarkScriptFilenames(JSRuntime *rt, JSBool keepAtoms);
243
244	extern void
245	js_SweepScriptFilenames(JSRuntime *rt);
246
247	/*
248	* Two successively less primitive ways to make a new JSScript. The first
249	* does not call a non-null cx->runtime->newScriptHook -- only the second,
250	* js_NewScriptFromCG, calls this optional debugger hook.
251	*
252	* The js_NewScript function can't know whether the script it creates belongs
253	* to a function, or is top-level or eval code, but the debugger wants access
254	* to the newly made script's function, if any -- so callers of js_NewScript
255	* are responsible for notifying the debugger after successfully creating any
256	* kind (function or other) of new JSScript.
257	*/
258	extern JSScript *
259	js_NewScript(JSContext *cx, uint32 length, uint32 nsrcnotes, uint32 natoms,
260	uint32 nobjects, uint32 nupvars, uint32 nregexps,
261	uint32 ntrynotes);
262
263	extern JSScript *
264	js_NewScriptFromCG(JSContext cx, JSCodeGenerator cg);
265
266	/*
267	* New-script-hook calling is factored from js_NewScriptFromCG so that it
268	* and callers of js_XDRScript can share this code. In the case of callers
269	* of js_XDRScript, the hook should be invoked only after successful decode
270	* of any owning function (the fun parameter) or script object (null fun).
271	*/
272	extern JS_FRIEND_API(void)
273	js_CallNewScriptHook(JSContext cx, JSScript script, JSFunction *fun);
274
275	extern JS_FRIEND_API(void)
276	js_CallDestroyScriptHook(JSContext cx, JSScript script);
277
278	extern void
279	js_DestroyScript(JSContext cx, JSScript script);
280
281	extern void
282	js_TraceScript(JSTracer trc, JSScript script);
283
284	/*
285	* To perturb as little code as possible, we introduce a js_GetSrcNote lookup
286	* cache without adding an explicit cx parameter. Thus js_GetSrcNote becomes
287	* a macro that uses cx from its calls' lexical environments.
288	*/
289	#define js_GetSrcNote(script,pc) js_GetSrcNoteCached(cx, script, pc)
290
291	extern jssrcnote *
292	js_GetSrcNoteCached(JSContext cx, JSScript script, jsbytecode *pc);
293
294	/* XXX need cx to lock function objects declared by prolog bytecodes. */
295	extern uintN
296	js_PCToLineNumber(JSContext cx, JSScript script, jsbytecode *pc);
297
298	extern jsbytecode *
299	js_LineNumberToPC(JSScript *script, uintN lineno);
300
301	extern JS_FRIEND_API(uintN)
302	js_GetScriptLineExtent(JSScript *script);
303
304	/*
305	* If magic is non-null, js_XDRScript succeeds on magic number mismatch but
306	* returns false in magic; it reflects a match via a true magic out param.
307	* If magic is null, js_XDRScript returns false on bad magic number errors,
308	* which it reports.
309	*
310	* NB: callers must call js_CallNewScriptHook after successful JSXDR_DECODE
311	* and subsequent set-up of owning function or script object, if any.
312	*/
313	extern JSBool
314	js_XDRScript(JSXDRState xdr, JSScript scriptp, JSBool magic);
315
316	JS_END_EXTERN_C
317
318	#endif /* jsscript_h___ */