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gecko-dev/js/ref/jsobj.h
brendan%netscape.com 347aaac8d3 js.c jsemit.c jsemit.h jsgc.c jsinterp.c jsopcode.c jsopcode.def 
- Switch improvements:
  - JSOP_CONDSWITCH is a 1 byte nop, not variable length with the same kind
    of immediate operand as JSOP_LOOKUPSWITCH (which is useless except for
    decompilation).  New scheme uses SRC_COMMA notes on each JSOP_CASE opcode,
    usually 2 bytes per note, and a typically-1-byte 2nd offset on SRC_SWITCH:
      1 + 2 * ncases
    vs. the previous JSOP_LOOKUPSWITCH immediate, which consumed:
      4 * ncases
    bytes after the switch opcode just for decompilation.
  - SRC_SWITCH has two offsets, first to end of switch as before, the second
    to first case if JSOP_CONDSWITCH, for decompilation.
  - Optimize switches with all-constant cases using JSOP_TABLESWITH, or if
    that can't be used, JSOP_LOOKUPSWITCH, before falling back on ECMAv2's
    JSOP_CONDSWITCH.
  - Use cx->gcDisabled when evaluating case exprs at compile time for old,
    pre-ECMAv2 switches, to prevent branch-callback-based GC invocations
    from ripping apart the unrooted temporary script for each case expr.
  - Fixed up stale SRC_SWITCH comments in jsemit.h.

jsemit.c jsemit.h
  - TREE_CONTEXT_INIT to match ATOM_LIST_INIT, not English word order.
  - Reorganized JSCodeGenerator to sort of match argument order to
    js_InitCodeGenerator.
  - Got rid of confusing CG_RESET* macros and used memset(cg, 0, sizeof *cg)
    and non-zero-default init in js_InitCodeGenerator.  js_ResetCodeGenerator
    just releases the code and temp arena pools and leaves the cg in a state
    where it must be re-initialized (as before, but more obvious).
  - In the same spirit, don't do partial "resets" or src and trynotes in their
    js_FinishTaking*Notes functions -- those are friends of jsscript.c and are
    not general, idempotent functions.

jsapi.c jsapi.h jsarray.c jsatom.c jsatom.h jscntxt.c jsemit.c jsmsg.def
jsnum.c jsobj.c jsopcode.c jsregexp.c jsscan.c jsstr.c jsxdrapi.
  - Use PR_snprintf rather than sprintf always, so we don't have to worry
    about systems with 64-bit longs that overflow 12-byte buffers and open
    Morris-Worm-type security holes.
  - Trim extra spaces, fix hanging indentation, and similar anal retention.
  - Renamed JSMSG_BAD_PROTO_SORT to JSMSG_BAD_SORT_ARG cuz that's what it
    is complaining about.
  - SRC_CATCHGUARD still lived in comments, but it's SRC_CATCH in code.

jscntxt.c jscntxt.h jsinterp.c
  - Packed nearby JSPackedBools and added a new one: gcDisabled, for use by
    jsemit.c's pre-ECMAv2 switch case expr eval.
  - Rip out old js_InterpreterHooks stuff from original liveconnect (moja).
  - Remove javaData and savedErrors from JSContext.  Leaving it to fur or
    shaver to remove javaData from jsscript.h.
1998-09-08 05:39:51 +00:00

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/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
#ifndef jsobj_h___
#define jsobj_h___
/*
* JS object definitions.
*
* A JS object consists of a possibly-shared object descriptor containing
* ordered property names, called the map; and a dense vector of property
* values, called slots. The map/slot pointer pair is GC'ed, while the map
* is reference counted and the slot vector is malloc'ed.
*/
#ifdef NETSCAPE_INTERNAL
#include "prhash.h"
#endif
#include "jsprvtd.h"
#include "jspubtd.h"
PR_BEGIN_EXTERN_C
struct JSObjectMap {
jsrefcount nrefs; /* count of all referencing objects */
JSObjectOps *ops; /* high level object operation vtable */
uint32 nslots; /* length of obj->slots vector */
uint32 freeslot; /* index of next free obj->slots element */
};
/* Shorthand macros for frequently-made calls. */
#if defined JS_THREADSAFE && defined DEBUG
#define OBJ_LOOKUP_PROPERTY(cx,obj,id,objp,propp) \
(obj)->map->ops->lookupProperty(cx,obj,id,objp,propp,__FILE__,__LINE__)
#else
#define OBJ_LOOKUP_PROPERTY(cx,obj,id,objp,propp) \
(obj)->map->ops->lookupProperty(cx,obj,id,objp,propp)
#endif
#define OBJ_DEFINE_PROPERTY(cx,obj,id,value,getter,setter,attrs,propp) \
(obj)->map->ops->defineProperty(cx,obj,id,value,getter,setter,attrs,propp)
#define OBJ_GET_PROPERTY(cx,obj,id,vp) \
(obj)->map->ops->getProperty(cx,obj,id,vp)
#define OBJ_SET_PROPERTY(cx,obj,id,vp) \
(obj)->map->ops->setProperty(cx,obj,id,vp)
#define OBJ_GET_ATTRIBUTES(cx,obj,id,prop,attrsp) \
(obj)->map->ops->getAttributes(cx,obj,id,prop,attrsp)
#define OBJ_SET_ATTRIBUTES(cx,obj,id,prop,attrsp) \
(obj)->map->ops->setAttributes(cx,obj,id,prop,attrsp)
#define OBJ_DELETE_PROPERTY(cx,obj,id,rval) \
(obj)->map->ops->deleteProperty(cx,obj,id,rval)
#define OBJ_DEFAULT_VALUE(cx,obj,hint,vp) \
(obj)->map->ops->defaultValue(cx,obj,hint,vp)
#define OBJ_ENUMERATE(cx,obj,enum_op,statep,idp) \
(obj)->map->ops->enumerate(cx,obj,enum_op,statep,idp)
#define OBJ_CHECK_ACCESS(cx,obj,id,mode,vp,attrsp) \
(obj)->map->ops->checkAccess(cx,obj,id,mode,vp,attrsp)
/* These two are time-optimized to avoid stub calls. */
#define OBJ_THIS_OBJECT(cx,obj) \
((obj)->map->ops->thisObject \
? (obj)->map->ops->thisObject(cx,obj) \
: (obj))
#define OBJ_DROP_PROPERTY(cx,obj,prop) \
((obj)->map->ops->dropProperty \
? (obj)->map->ops->dropProperty(cx,obj,prop) \
: (void)0)
struct JSObject {
JSObjectMap *map;
jsval *slots;
};
#define JSSLOT_PROTO 0
#define JSSLOT_PARENT 1
#define JSSLOT_CLASS 2
#define JSSLOT_PRIVATE 3
#define JSSLOT_START 3
#define JSSLOT_FREE(clasp) (((clasp)->flags & JSCLASS_HAS_PRIVATE) \
? JSSLOT_PRIVATE + 1 \
: JSSLOT_START)
#define JS_INITIAL_NSLOTS 5
#ifdef DEBUG
#define MAP_CHECK_SLOT(map,slot) \
PR_ASSERT((uint32)slot < PR_MAX((map)->nslots, (map)->freeslot))
#define OBJ_CHECK_SLOT(obj,slot) \
MAP_CHECK_SLOT((obj)->map, slot)
#else
#define OBJ_CHECK_SLOT(obj,slot) ((void)0)
#endif
/* Fast macros for accessing obj->slots while obj is locked (if thread-safe). */
#define LOCKED_OBJ_GET_SLOT(obj,slot) \
(OBJ_CHECK_SLOT(obj, slot), (obj)->slots[slot])
#define LOCKED_OBJ_SET_SLOT(obj,slot,value) \
(OBJ_CHECK_SLOT(obj, slot), (obj)->slots[slot] = (value))
#define LOCKED_OBJ_GET_PROTO(obj) \
JSVAL_TO_OBJECT(LOCKED_OBJ_GET_SLOT(obj, JSSLOT_PROTO))
#define LOCKED_OBJ_GET_CLASS(obj) \
((JSClass *)JSVAL_TO_PRIVATE(LOCKED_OBJ_GET_SLOT(obj, JSSLOT_CLASS)))
#ifdef JS_THREADSAFE
/* Thread-safe functions and wrapper macros for accessing obj->slots. */
#define OBJ_GET_SLOT(cx,obj,slot) \
(OBJ_CHECK_SLOT(obj, slot), js_GetSlotWhileLocked(cx, obj, slot))
#define OBJ_SET_SLOT(cx,obj,slot,value) \
(OBJ_CHECK_SLOT(obj, slot), js_SetSlotWhileLocked(cx, obj, slot, value))
#else /* !JS_THREADSAFE */
#define OBJ_GET_SLOT(cx,obj,slot) LOCKED_OBJ_GET_SLOT(obj,slot)
#define OBJ_SET_SLOT(cx,obj,slot,value) LOCKED_OBJ_SET_SLOT(obj,slot,value)
#endif /* !JS_THREADSAFE */
/* Thread-safe proto, parent, and class access macros. */
#define OBJ_GET_PROTO(cx,obj) \
JSVAL_TO_OBJECT(OBJ_GET_SLOT(cx, obj, JSSLOT_PROTO))
#define OBJ_SET_PROTO(cx,obj,proto) \
OBJ_SET_SLOT(cx, obj, JSSLOT_PROTO, OBJECT_TO_JSVAL(proto))
#define OBJ_GET_PARENT(cx,obj) \
JSVAL_TO_OBJECT(OBJ_GET_SLOT(cx, obj, JSSLOT_PARENT))
#define OBJ_SET_PARENT(cx,obj,parent) \
OBJ_SET_SLOT(cx, obj, JSSLOT_PARENT, OBJECT_TO_JSVAL(parent))
#define OBJ_GET_CLASS(cx,obj) \
((JSClass *)JSVAL_TO_PRIVATE(OBJ_GET_SLOT(cx, obj, JSSLOT_CLASS)))
/* Test whether a map or object is native. */
#define MAP_IS_NATIVE(map) ((map)->ops == &js_ObjectOps)
#define OBJ_IS_NATIVE(obj) MAP_IS_NATIVE((obj)->map)
extern JS_FRIEND_DATA(JSObjectOps) js_ObjectOps;
extern JSClass js_ObjectClass;
extern JSClass js_WithClass;
struct JSSharpObjectMap {
jsrefcount depth;
jsatomid sharpgen;
PRHashTable *table;
};
#define SHARP_BIT 1
#define IS_SHARP(he) ((jsatomid)(he)->value & SHARP_BIT)
#define MAKE_SHARP(he) ((he)->value = (void*)((jsatomid)(he)->value|SHARP_BIT))
extern PRHashEntry *
js_EnterSharpObject(JSContext *cx, JSObject *obj, JSIdArray **idap,
jschar **sp);
extern void
js_LeaveSharpObject(JSContext *cx, JSIdArray **idap);
extern JSBool
js_obj_toSource(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval);
extern JSBool
js_obj_toString(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval);
extern JSObject *
js_InitObjectClass(JSContext *cx, JSObject *obj);
extern void
js_InitObjectMap(JSObjectMap *map, jsrefcount nrefs, JSObjectOps *ops,
JSClass *clasp);
extern JSObjectMap *
js_NewObjectMap(JSContext *cx, jsrefcount nrefs, JSObjectOps *ops,
JSClass *clasp, JSObject *obj);
extern void
js_DestroyObjectMap(JSContext *cx, JSObjectMap *map);
extern JSObjectMap *
js_HoldObjectMap(JSContext *cx, JSObjectMap *map);
extern JSObjectMap *
js_DropObjectMap(JSContext *cx, JSObjectMap *map, JSObject *obj);
extern JSObject *
js_NewObject(JSContext *cx, JSClass *clasp, JSObject *proto, JSObject *parent);
extern JSObject *
js_ConstructObject(JSContext *cx, JSClass *clasp, JSObject *proto,
JSObject *parent);
extern void
js_FinalizeObject(JSContext *cx, JSObject *obj);
extern JSBool
js_AllocSlot(JSContext *cx, JSObject *obj, uint32 *slotp);
extern void
js_FreeSlot(JSContext *cx, JSObject *obj, uint32 slot);
/*
* On error, return false. On success, if propp is non-null, return true with
* obj locked and with a held property in *propp; if propp is null, return true
* but release obj's lock first. Therefore all callers who pass non-null propp
* result parameters must later call OBJ_DROP_PROPERTY(cx, obj, *propp) both to
* drop the held property, and to release the lock on obj.
*/
extern JSBool
js_DefineProperty(JSContext *cx, JSObject *obj, jsid id, jsval value,
JSPropertyOp getter, JSPropertyOp setter, uintN attrs,
JSProperty **propp);
/*
* Unlike js_DefineProperty, propp must be non-null. On success, and if id was
* found, return true with *objp non-null and locked, and with a held property
* stored in *propp. If successful but id was not found, return true with both
* *objp and *propp null. Therefore all callers who receive a non-null *propp
* must later call OBJ_DROP_PROPERTY(cx, *objp, *propp).
*/
#if defined JS_THREADSAFE && defined DEBUG
extern JS_FRIEND_API(JSBool)
_js_LookupProperty(JSContext *cx, JSObject *obj, jsid id, JSObject **objp,
JSProperty **propp, const char *file, uintN line);
#define js_LookupProperty(cx,obj,id,objp,propp) \
_js_LookupProperty(cx,obj,id,objp,propp,__FILE__,__LINE__)
#else
extern JS_FRIEND_API(JSBool)
js_LookupProperty(JSContext *cx, JSObject *obj, jsid id, JSObject **objp,
JSProperty **propp);
#endif
extern JS_FRIEND_API(JSBool)
js_FindProperty(JSContext *cx, jsid id, JSObject **objp, JSObject **pobjp,
JSProperty **propp);
extern JSBool
js_FindVariable(JSContext *cx, jsid id, JSObject **objp, JSObject **pobjp,
JSProperty **propp);
extern JSObject *
js_FindVariableScope(JSContext *cx, JSFunction **funp);
extern JSBool
js_GetProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp);
extern JSBool
js_SetProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp);
extern JSBool
js_GetAttributes(JSContext *cx, JSObject *obj, jsid id, JSProperty *prop,
uintN *attrsp);
extern JSBool
js_SetAttributes(JSContext *cx, JSObject *obj, jsid id, JSProperty *prop,
uintN *attrsp);
extern JSBool
js_DeleteProperty(JSContext *cx, JSObject *obj, jsid id, jsval *rval);
extern JSBool
js_DefaultValue(JSContext *cx, JSObject *obj, JSType hint, jsval *vp);
extern JSBool
js_Enumerate(JSContext *cx, JSObject *obj, JSIterateOp enum_op,
jsval *statep, jsid *idp);
extern JSBool
js_CheckAccess(JSContext *cx, JSObject *obj, jsid id, JSAccessMode mode,
jsval *vp, uintN *attrsp);
extern JSBool
js_Call(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval);
extern JSBool
js_Construct(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval);
extern JSBool
js_HasInstance(JSContext *cx, JSObject *obj, jsval v, JSBool *bp);
extern JSBool
js_IsDelegate(JSContext *cx, JSObject *obj, jsval v, JSBool *bp);
extern JSBool
js_GetClassPrototype(JSContext *cx, const char *name, JSObject **protop);
extern JSBool
js_SetClassPrototype(JSContext *cx, JSObject *ctor, JSObject *proto,
uintN attrs);
extern JSBool
js_ValueToObject(JSContext *cx, jsval v, JSObject **objp);
extern JSObject *
js_ValueToNonNullObject(JSContext *cx, jsval v);
extern void
js_TryValueOf(JSContext *cx, JSObject *obj, JSType type, jsval *rval);
extern void
js_TryMethod(JSContext *cx, JSObject *obj, JSAtom *atom,
uintN argc, jsval *argv, jsval *rval);
extern JSBool
js_XDRObject(JSXDRState *xdr, JSObject **objp);
extern JSIdArray *
js_NewIdArray(JSContext *cx, jsint length);
PR_END_EXTERN_C
#endif /* jsobj_h___ */
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