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gecko-dev/js/src/jsobj.c

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75 KiB
C
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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 1.1 (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/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
* 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 Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU Public License (the "GPL"), in which case the
* provisions of the GPL are applicable instead of those above.
* If you wish to allow use of your version of this file only
* under the terms of the GPL and not to allow others to use your
* version of this file under the NPL, indicate your decision by
* deleting the provisions above and replace them with the notice
* and other provisions required by the GPL. If you do not delete
* the provisions above, a recipient may use your version of this
* file under either the NPL or the GPL.
*/
/*
* JS object implementation.
*/
#include "jsstddef.h"
#include <stdlib.h>
#include <string.h>
#include "jstypes.h"
#include "jsarena.h" /* Added by JSIFY */
#include "jsutil.h" /* Added by JSIFY */
#include "jshash.h" /* Added by JSIFY */
#include "jsprf.h"
#include "jsapi.h"
#include "jsatom.h"
#include "jsbool.h"
#include "jscntxt.h"
#include "jsconfig.h"
#include "jsfun.h"
#include "jsgc.h"
#include "jsinterp.h"
#include "jslock.h"
#include "jsnum.h"
#include "jsobj.h"
#include "jsscope.h"
#include "jsscript.h"
#include "jsstr.h"
#if JS_HAS_OBJ_WATCHPOINT
#include "jsdbgapi.h"
#endif
#ifdef JS_THREADSAFE
#define NATIVE_DROP_PROPERTY js_DropProperty
extern void
js_DropProperty(JSContext *cx, JSObject *obj, JSProperty *prop);
#else
#define NATIVE_DROP_PROPERTY NULL
#endif
#ifdef XP_MAC
#pragma export on
#endif
JS_FRIEND_DATA(JSObjectOps) js_ObjectOps = {
js_NewObjectMap, js_DestroyObjectMap,
#if defined JS_THREADSAFE && defined DEBUG
_js_LookupProperty, js_DefineProperty,
#else
js_LookupProperty, js_DefineProperty,
#endif
js_GetProperty, js_SetProperty,
js_GetAttributes, js_SetAttributes,
js_DeleteProperty, js_DefaultValue,
js_Enumerate, js_CheckAccess,
NULL, NATIVE_DROP_PROPERTY,
js_Call, js_Construct,
NULL, js_HasInstance,
{0,0}
};
#ifdef XP_MAC
#pragma export off
#endif
JSClass js_ObjectClass = {
js_Object_str,
0,
JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
JS_EnumerateStub, JS_ResolveStub, JS_ConvertStub, JS_FinalizeStub,
JSCLASS_NO_OPTIONAL_MEMBERS
};
#if JS_HAS_OBJ_PROTO_PROP
static JSBool
obj_getSlot(JSContext *cx, JSObject *obj, jsval id, jsval *vp);
JS_STATIC_DLL_CALLBACK(JSBool)
obj_setSlot(JSContext *cx, JSObject *obj, jsval id, jsval *vp);
static JSBool
obj_getCount(JSContext *cx, JSObject *obj, jsval id, jsval *vp);
static JSPropertySpec object_props[] = {
/* These two must come first; see object_props[slot].name usage below. */
{js_proto_str, JSSLOT_PROTO, JSPROP_PERMANENT, obj_getSlot, obj_setSlot},
{js_parent_str,JSSLOT_PARENT, JSPROP_PERMANENT|JSPROP_READONLY,
obj_getSlot, obj_setSlot},
{js_count_str, 0, JSPROP_PERMANENT, obj_getCount, obj_getCount},
{0,0,0,0,0}
};
static JSBool
obj_getSlot(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
uint32 slot;
JSAccessMode mode;
uintN attrs;
slot = (uint32) JSVAL_TO_INT(id);
if (id == INT_TO_JSVAL(JSSLOT_PROTO)) {
id = (jsid)cx->runtime->atomState.protoAtom;
mode = JSACC_PROTO;
} else {
id = (jsid)cx->runtime->atomState.parentAtom;
mode = JSACC_PARENT;
}
if (!OBJ_CHECK_ACCESS(cx, obj, id, mode, vp, &attrs))
return JS_FALSE;
*vp = OBJ_GET_SLOT(cx, obj, slot);
return JS_TRUE;
}
JS_STATIC_DLL_CALLBACK(JSBool)
obj_setSlot(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
JSObject *obj2;
uint32 slot;
if (!JSVAL_IS_OBJECT(*vp))
return JS_TRUE;
obj2 = JSVAL_TO_OBJECT(*vp);
slot = (uint32) JSVAL_TO_INT(id);
while (obj2) {
if (obj2 == obj) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_CYCLIC_VALUE, object_props[slot].name);
return JS_FALSE;
}
obj2 = JSVAL_TO_OBJECT(OBJ_GET_SLOT(cx, obj2, slot));
}
OBJ_SET_SLOT(cx, obj, slot, *vp);
return JS_TRUE;
}
static JSBool
obj_getCount(JSContext *cx, JSObject *obj, jsval id, jsval *vp)
{
jsval iter_state;
jsid num_properties;
JSBool ok;
/* Get the number of properties to enumerate. */
iter_state = JSVAL_NULL;
ok = OBJ_ENUMERATE(cx, obj, JSENUMERATE_INIT, &iter_state, &num_properties);
if (!ok)
goto out;
if (!JSVAL_IS_INT(num_properties)) {
JS_ASSERT(0);
*vp = JSVAL_ZERO;
goto out;
}
*vp = num_properties;
out:
if (iter_state != JSVAL_NULL)
ok = OBJ_ENUMERATE(cx, obj, JSENUMERATE_DESTROY, &iter_state, 0);
return ok;
}
#else /* !JS_HAS_OBJ_PROTO_PROP */
#define object_props NULL
#endif /* !JS_HAS_OBJ_PROTO_PROP */
JS_STATIC_DLL_CALLBACK(JSHashNumber)
js_hash_object(const void *key)
{
return (JSHashNumber)key >> JSVAL_TAGBITS;
}
static JSHashEntry *
MarkSharpObjects(JSContext *cx, JSObject *obj, JSIdArray **idap)
{
JSSharpObjectMap *map;
JSHashTable *table;
JSHashNumber hash;
JSHashEntry **hep, *he;
jsatomid sharpid;
JSIdArray *ida;
JSBool ok;
jsint i, length;
jsid id;
JSObject *obj2;
JSProperty *prop;
uintN attrs;
jsval val;
map = &cx->sharpObjectMap;
table = map->table;
hash = js_hash_object(obj);
hep = JS_HashTableRawLookup(table, hash, obj);
he = *hep;
if (!he) {
sharpid = 0;
he = JS_HashTableRawAdd(table, hep, hash, obj, (void *)sharpid);
if (!he) {
JS_ReportOutOfMemory(cx);
return NULL;
}
ida = JS_Enumerate(cx, obj);
if (!ida)
return NULL;
ok = JS_TRUE;
for (i = 0, length = ida->length; i < length; i++) {
id = ida->vector[i];
#if JS_HAS_GETTER_SETTER
ok = OBJ_LOOKUP_PROPERTY(cx, obj, id, &obj2, &prop);
if (!ok)
break;
ok = OBJ_GET_ATTRIBUTES(cx, obj, id, prop, &attrs);
if (ok) {
if (prop &&
OBJ_IS_NATIVE(obj2) &&
(attrs & (JSPROP_GETTER | JSPROP_SETTER))) {
val = JSVAL_NULL;
if (attrs & JSPROP_GETTER)
val = (jsval)SPROP_GETTER((JSScopeProperty*)prop, obj2);
if (attrs & JSPROP_SETTER) {
if (val != JSVAL_NULL) {
/* Mark the getter here, then set val to setter. */
ok = (MarkSharpObjects(cx, JSVAL_TO_OBJECT(val),
NULL)
!= NULL);
}
val = (jsval)SPROP_SETTER((JSScopeProperty*)prop, obj2);
}
} else {
ok = OBJ_GET_PROPERTY(cx, obj, id, &val);
}
}
if (prop)
OBJ_DROP_PROPERTY(cx, obj2, prop);
#else
ok = OBJ_GET_PROPERTY(cx, obj, id, &val);
#endif
if (!ok)
break;
if (!JSVAL_IS_PRIMITIVE(val) &&
!MarkSharpObjects(cx, JSVAL_TO_OBJECT(val), NULL)) {
ok = JS_FALSE;
break;
}
}
if (!ok || !idap)
JS_DestroyIdArray(cx, ida);
if (!ok)
return NULL;
} else {
sharpid = (jsatomid) he->value;
if (sharpid == 0) {
sharpid = ++map->sharpgen << 1;
he->value = (void *) sharpid;
}
ida = NULL;
}
if (idap)
*idap = ida;
return he;
}
JSHashEntry *
js_EnterSharpObject(JSContext *cx, JSObject *obj, JSIdArray **idap,
jschar **sp)
{
JSSharpObjectMap *map;
JSHashTable *table;
JSIdArray *ida;
JSHashNumber hash;
JSHashEntry *he, **hep;
jsatomid sharpid;
char buf[20];
size_t len;
map = &cx->sharpObjectMap;
table = map->table;
if (!table) {
table = JS_NewHashTable(8, js_hash_object, JS_CompareValues,
JS_CompareValues, NULL, NULL);
if (!table) {
JS_ReportOutOfMemory(cx);
return NULL;
}
map->table = table;
}
ida = NULL;
if (map->depth == 0) {
he = MarkSharpObjects(cx, obj, &ida);
if (!he)
return NULL;
JS_ASSERT((((jsatomid) he->value) & SHARP_BIT) == 0);
if (!idap) {
JS_DestroyIdArray(cx, ida);
ida = NULL;
}
} else {
hash = js_hash_object(obj);
hep = JS_HashTableRawLookup(table, hash, obj);
he = *hep;
/*
* It's possible that the value of a property has changed from the
* first time the object's properties are traversed (when the property
* ids are entered into the hash table) to the second (when they are
* converted to strings), i.e. the getProperty() call is not
* idempotent.
*/
if (!he) {
he = JS_HashTableRawAdd(table, hep, hash, obj, (void *)0);
if (!he)
JS_ReportOutOfMemory(cx);
*sp = NULL;
sharpid = 0;
goto out;
}
}
sharpid = (jsatomid) he->value;
if (sharpid == 0) {
*sp = NULL;
} else {
len = JS_snprintf(buf, sizeof buf, "#%u%c",
sharpid >> 1, (sharpid & SHARP_BIT) ? '#' : '=');
*sp = js_InflateString(cx, buf, len);
if (!*sp) {
if (ida)
JS_DestroyIdArray(cx, ida);
return NULL;
}
}
out:
if ((sharpid & SHARP_BIT) == 0) {
if (idap && !ida) {
ida = JS_Enumerate(cx, obj);
if (!ida) {
if (*sp) {
JS_free(cx, *sp);
*sp = NULL;
}
return NULL;
}
}
map->depth++;
}
if (idap)
*idap = ida;
return he;
}
void
js_LeaveSharpObject(JSContext *cx, JSIdArray **idap)
{
JSSharpObjectMap *map;
JSIdArray *ida;
map = &cx->sharpObjectMap;
JS_ASSERT(map->depth > 0);
if (--map->depth == 0) {
map->sharpgen = 0;
JS_HashTableDestroy(map->table);
map->table = NULL;
}
if (idap) {
ida = *idap;
if (ida) {
JS_DestroyIdArray(cx, ida);
*idap = NULL;
}
}
}
#define OBJ_TOSTRING_EXTRA 3 /* for 3 local GC roots */
#if JS_HAS_INITIALIZERS || JS_HAS_TOSOURCE
JSBool
js_obj_toSource(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
JSBool ok, outermost;
JSHashEntry *he;
JSIdArray *ida;
jschar *chars, *ochars, *vchars, *vsharp;
size_t nchars, vlength, vsharplength;
char *comma;
jsint i, j, length, valcnt;
jsid id;
JSObject *obj2;
JSProperty *prop;
uintN attrs;
jsval val[2];
#if JS_HAS_GETTER_SETTER
JSString *gsop[2];
#endif
JSString *idstr, *valstr, *str;
/*
* obj_toString for 1.2 calls toSource, and doesn't want the extra parens
* on the outside.
*/
outermost = (cx->version != JSVERSION_1_2 && cx->sharpObjectMap.depth == 0);
he = js_EnterSharpObject(cx, obj, &ida, &chars);
if (!he)
return JS_FALSE;
if (IS_SHARP(he)) { /* we didn't enter -- obj is already sharp */
JS_ASSERT(!ida);
#if JS_HAS_SHARP_VARS
nchars = js_strlen(chars);
#else
chars[0] = '{';
chars[1] = '}';
chars[2] = 0;
nchars = 2;
#endif
goto make_string;
}
JS_ASSERT(ida);
ok = JS_TRUE;
/* Allocate 4 + 1 for "({})" and the terminator. */
if (!chars) {
chars = malloc((4 + 1) * sizeof(jschar));
nchars = 0;
if (!chars)
goto error;
} else {
JS_ASSERT(!outermost);
MAKE_SHARP(he);
nchars = js_strlen(chars);
chars = realloc((ochars = chars), (nchars + 2 + 1) * sizeof(jschar));
if (!chars) {
free(ochars);
goto error;
}
}
if (outermost)
chars[nchars++] = '(';
chars[nchars++] = '{';
comma = NULL;
for (i = 0, length = ida->length; i < length; i++) {
/* Get strings for id and value and GC-root them via argv. */
id = ida->vector[i];
#if JS_HAS_GETTER_SETTER
ok = OBJ_LOOKUP_PROPERTY(cx, obj, id, &obj2, &prop);
if (!ok)
goto error;
ok = OBJ_GET_ATTRIBUTES(cx, obj2, id, prop, &attrs);
if (ok) {
if (prop &&
OBJ_IS_NATIVE(obj2) &&
(attrs & (JSPROP_GETTER | JSPROP_SETTER))) {
valcnt = 0;
if (attrs & JSPROP_GETTER) {
val[valcnt] = (jsval)
SPROP_GETTER((JSScopeProperty *)prop, obj2);
gsop[valcnt] =
ATOM_TO_STRING(cx->runtime->atomState.getterAtom);
valcnt++;
}
if (attrs & JSPROP_SETTER) {
val[valcnt] = (jsval)
SPROP_SETTER((JSScopeProperty *)prop, obj2);
gsop[valcnt] =
ATOM_TO_STRING(cx->runtime->atomState.setterAtom);
valcnt++;
}
} else {
valcnt = 1;
gsop[0] = NULL;
ok = OBJ_GET_PROPERTY(cx, obj, id, &val[0]);
}
}
if (prop)
OBJ_DROP_PROPERTY(cx, obj2, prop);
#else
valcnt = 1;
ok = OBJ_GET_PROPERTY(cx, obj, id, &val[0]);
#endif
if (!ok)
goto error;
/* Convert id to a jsval and then to a string. */
id = js_IdToValue(id);
idstr = js_ValueToString(cx, id);
if (!idstr) {
ok = JS_FALSE;
goto error;
}
argv[0] = STRING_TO_JSVAL(idstr);
/* If id is a non-identifier string, it needs to be quoted. */
if (JSVAL_IS_STRING(id) && !js_IsIdentifier(idstr)) {
idstr = js_QuoteString(cx, idstr, (jschar)'\'');
if (!idstr) {
ok = JS_FALSE;
goto error;
}
argv[0] = STRING_TO_JSVAL(idstr);
}
for (j = 0; j < valcnt; j++) {
/* Convert val[j] to its canonical source form. */
valstr = js_ValueToSource(cx, val[j]);
if (!valstr) {
ok = JS_FALSE;
goto error;
}
argv[1+j] = STRING_TO_JSVAL(valstr);
vchars = valstr->chars;
vlength = valstr->length;
/* If val[j] is a non-sharp object, consider sharpening it. */
vsharp = NULL;
vsharplength = 0;
#if JS_HAS_SHARP_VARS
if (!JSVAL_IS_PRIMITIVE(val[j]) && vchars[0] != '#') {
he = js_EnterSharpObject(cx, JSVAL_TO_OBJECT(val[j]), NULL,
&vsharp);
if (!he) {
ok = JS_FALSE;
goto error;
}
if (IS_SHARP(he)) {
vchars = vsharp;
vlength = js_strlen(vchars);
} else {
if (vsharp) {
vsharplength = js_strlen(vsharp);
MAKE_SHARP(he);
}
js_LeaveSharpObject(cx, NULL);
}
}
#endif
/* Allocate 1 + 1 at end for closing brace and terminating 0. */
chars = realloc((ochars = chars),
(nchars + (comma ? 2 : 0) +
idstr->length + 1 +
#if JS_HAS_GETTER_SETTER
(gsop[j] ? 1 + gsop[j]->length : 0) +
#endif
vsharplength + vlength +
(outermost ? 2 : 1) + 1) * sizeof(jschar));
if (!chars) {
/* Save code space on error: let JS_free ignore null vsharp. */
JS_free(cx, vsharp);
free(ochars);
goto error;
}
if (comma) {
chars[nchars++] = comma[0];
chars[nchars++] = comma[1];
}
comma = ", ";
js_strncpy(&chars[nchars], idstr->chars, idstr->length);
nchars += idstr->length;
#if JS_HAS_GETTER_SETTER
if (gsop[j]) {
chars[nchars++] = ' ';
js_strncpy(&chars[nchars], gsop[j]->chars, gsop[j]->length);
nchars += gsop[j]->length;
}
#endif
chars[nchars++] = ':';
if (vsharplength) {
js_strncpy(&chars[nchars], vsharp, vsharplength);
nchars += vsharplength;
}
js_strncpy(&chars[nchars], vchars, vlength);
nchars += vlength;
if (vsharp)
JS_free(cx, vsharp);
}
}
chars[nchars++] = '}';
if (outermost)
chars[nchars++] = ')';
chars[nchars] = 0;
error:
js_LeaveSharpObject(cx, &ida);
if (!ok) {
if (chars)
free(chars);
return ok;
}
if (!chars) {
JS_ReportOutOfMemory(cx);
return JS_FALSE;
}
make_string:
str = js_NewString(cx, chars, nchars, 0);
if (!str) {
free(chars);
return JS_FALSE;
}
*rval = STRING_TO_JSVAL(str);
return JS_TRUE;
}
#endif /* JS_HAS_INITIALIZERS || JS_HAS_TOSOURCE */
JSBool
js_obj_toString(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
jschar *chars;
size_t nchars;
char *clazz, *prefix;
JSString *str;
#if JS_HAS_INITIALIZERS
if (cx->version == JSVERSION_1_2)
return js_obj_toSource(cx, obj, argc, argv, rval);
#endif
clazz = OBJ_GET_CLASS(cx, obj)->name;
nchars = 9 + strlen(clazz); /* 9 for "[object ]" */
chars = JS_malloc(cx, (nchars + 1) * sizeof(jschar));
if (!chars)
return JS_FALSE;
prefix = "[object ";
nchars = 0;
while ((chars[nchars] = (jschar)*prefix) != 0)
nchars++, prefix++;
while ((chars[nchars] = (jschar)*clazz) != 0)
nchars++, clazz++;
chars[nchars++] = ']';
chars[nchars] = 0;
str = js_NewString(cx, chars, nchars, 0);
if (!str) {
JS_free(cx, chars);
return JS_FALSE;
}
*rval = STRING_TO_JSVAL(str);
return JS_TRUE;
}
static JSBool
obj_valueOf(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
*rval = OBJECT_TO_JSVAL(obj);
return JS_TRUE;
}
static JSBool
obj_eval(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
JSStackFrame *caller;
JSObject *scopeobj;
JSString *str;
const char *file;
uintN line;
JSPrincipals *principals;
JSScript *script;
JSBool ok;
#if JS_HAS_EVAL_THIS_SCOPE
JSObject *callerScopeChain;
JSBool implicitWith = JS_FALSE; /* unnecessary init to kill gcc warning */
#endif
caller = cx->fp->down;
if (JSVERSION_IS_ECMA(cx->version) &&
caller->pc &&
*caller->pc != JSOP_EVAL) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_BAD_INDIRECT_CALL, js_eval_str);
return JS_FALSE;
}
if (!JSVAL_IS_STRING(argv[0])) {
*rval = argv[0];
return JS_TRUE;
}
#if JS_HAS_SCRIPT_OBJECT
/*
* Script.prototype.compile/exec and Object.prototype.eval all take an
* optional trailing argument that overrides the scope object.
*/
scopeobj = NULL;
if (argc >= 2) {
if (!js_ValueToObject(cx, argv[1], &scopeobj))
return JS_FALSE;
argv[1] = OBJECT_TO_JSVAL(scopeobj);
}
if (!scopeobj)
#endif
{
#if JS_HAS_EVAL_THIS_SCOPE
/* If obj.eval(str), emulate 'with (obj) eval(str)' in the caller. */
callerScopeChain = caller->scopeChain;
implicitWith = (caller->pc && *caller->pc != JSOP_EVAL);
if (implicitWith) {
scopeobj = js_NewObject(cx, &js_WithClass, obj, callerScopeChain);
if (!scopeobj)
return JS_FALSE;
caller->scopeChain = scopeobj;
}
/* From here on, control must exit through label out with ok set. */
#endif
#if JS_BUG_EVAL_THIS_SCOPE
/* An old version used the object in which eval was found for scope. */
scopeobj = obj;
#else
/* Compile using caller's current scope object (might be a function). */
scopeobj = caller->scopeChain;
#endif
}
str = JSVAL_TO_STRING(argv[0]);
if (caller->script) {
file = caller->script->filename;
line = js_PCToLineNumber(caller->script, caller->pc);
principals = caller->script->principals;
} else {
file = NULL;
line = 0;
principals = NULL;
}
script = JS_CompileUCScriptForPrincipals(cx, scopeobj, principals,
str->chars, str->length,
file, line);
if (!script) {
ok = JS_FALSE;
goto out;
}
#if !JS_BUG_EVAL_THIS_SCOPE
#if JS_HAS_SCRIPT_OBJECT
if (argc < 2)
#endif
{
/* Execute using caller's new scope object (might be a Call object). */
scopeobj = caller->scopeChain;
}
#endif
ok = js_Execute(cx, scopeobj, script, caller->fun, caller, JSFRAME_EVAL,
rval);
JS_DestroyScript(cx, script);
out:
#if JS_HAS_EVAL_THIS_SCOPE
/* Restore OBJ_GET_PARENT(scopeobj) not callerScopeChain in case of Call. */
if (implicitWith)
caller->scopeChain = OBJ_GET_PARENT(cx, scopeobj);
#endif
return ok;
}
#if JS_HAS_OBJ_WATCHPOINT
static JSBool
obj_watch_handler(JSContext *cx, JSObject *obj, jsval id, jsval old, jsval *nvp,
void *closure)
{
JSObject *funobj;
jsval argv[3];
funobj = closure;
argv[0] = id;
argv[1] = old;
argv[2] = *nvp;
return js_InternalCall(cx, obj, OBJECT_TO_JSVAL(funobj), 3, argv, nvp);
}
static JSBool
obj_watch(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
JSFunction *fun;
jsval userid, value;
jsid symid;
JSAtom *atom;
uintN attrs;
fun = js_ValueToFunction(cx, &argv[1], JS_FALSE);
if (!fun)
return JS_FALSE;
argv[1] = OBJECT_TO_JSVAL(fun->object);
/* Compute the unique int/atom symbol id needed by js_LookupProperty. */
userid = argv[0];
if (JSVAL_IS_INT(userid)) {
symid = (jsid)userid;
atom = NULL;
} else {
atom = js_ValueToStringAtom(cx, userid);
if (!atom)
return JS_FALSE;
symid = (jsid)atom;
}
if (!OBJ_CHECK_ACCESS(cx, obj, symid, JSACC_WATCH, &value, &attrs))
return JS_FALSE;
if (attrs & JSPROP_READONLY)
return JS_TRUE;
return JS_SetWatchPoint(cx, obj, userid, obj_watch_handler, fun->object);
}
static JSBool
obj_unwatch(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
JS_ClearWatchPoint(cx, obj, argv[0], NULL, NULL);
return JS_TRUE;
}
#endif /* JS_HAS_OBJ_WATCHPOINT */
#if JS_HAS_NEW_OBJ_METHODS
/*
* Prototype and property query methods, to complement the 'in' and
* 'instanceof' operators.
*/
/* Proposed ECMA 15.2.4.5. */
static JSBool
obj_hasOwnProperty(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
JSObject *obj2;
JSProperty *prop;
JSAtom *atom;
atom = js_ValueToStringAtom(cx, *argv);
if (atom == NULL || !OBJ_LOOKUP_PROPERTY(cx, obj, (jsid)atom, &obj2, &prop))
return JS_FALSE;
*rval = BOOLEAN_TO_JSVAL(prop && obj2 == obj);
if (prop)
OBJ_DROP_PROPERTY(cx, obj2, prop);
return JS_TRUE;
}
/* Proposed ECMA 15.2.4.6. */
static JSBool
obj_isPrototypeOf(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
JSBool b;
if (!js_IsDelegate(cx, obj, *argv, &b))
return JS_FALSE;
*rval = BOOLEAN_TO_JSVAL(b);
return JS_TRUE;
}
/* Proposed ECMA 15.2.4.7. */
static JSBool
obj_propertyIsEnumerable(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
JSAtom *atom;
uintN attrs;
atom = js_ValueToStringAtom(cx, *argv);
if (atom == NULL)
return JS_FALSE;
if (!OBJ_GET_ATTRIBUTES(cx, obj, (jsid)atom, NULL, &attrs))
return JS_FALSE;
*rval = BOOLEAN_TO_JSVAL((attrs & JSPROP_ENUMERATE) != 0);
return JS_TRUE;
}
#endif /* JS_HAS_NEW_OBJ_METHODS */
static JSFunctionSpec object_methods[] = {
#if JS_HAS_TOSOURCE
{js_toSource_str, js_obj_toSource, 0, 0, OBJ_TOSTRING_EXTRA},
#endif
{js_toString_str, js_obj_toString, 0, 0, OBJ_TOSTRING_EXTRA},
{js_valueOf_str, obj_valueOf, 0,0,0},
{js_eval_str, obj_eval, 1,0,0},
#if JS_HAS_OBJ_WATCHPOINT
{"watch", obj_watch, 2,0,0},
{"unwatch", obj_unwatch, 1,0,0},
#endif
#if JS_HAS_NEW_OBJ_METHODS
{"hasOwnProperty", obj_hasOwnProperty, 1,0,0},
{"isPrototypeOf", obj_isPrototypeOf, 1,0,0},
{"propertyIsEnumerable", obj_propertyIsEnumerable, 1,0,0},
#endif
{0,0,0,0,0}
};
static JSBool
Object(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
if (argc == 0) {
/* Trigger logic below to construct a blank object. */
obj = NULL;
} else {
/* If argv[0] is null or undefined, obj comes back null. */
if (!js_ValueToObject(cx, argv[0], &obj))
return JS_FALSE;
}
if (!obj) {
JS_ASSERT(!argc || JSVAL_IS_NULL(argv[0]) || JSVAL_IS_VOID(argv[0]));
if (cx->fp->constructing)
return JS_TRUE;
obj = js_NewObject(cx, &js_ObjectClass, NULL, NULL);
if (!obj)
return JS_FALSE;
}
*rval = OBJECT_TO_JSVAL(obj);
return JS_TRUE;
}
/*
* ObjectOps and Class for with-statement stack objects.
*/
static JSBool
with_LookupProperty(JSContext *cx, JSObject *obj, jsid id, JSObject **objp,
JSProperty **propp
#if defined JS_THREADSAFE && defined DEBUG
, const char *file, uintN line
#endif
)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_LookupProperty(cx, obj, id, objp, propp);
return OBJ_LOOKUP_PROPERTY(cx, proto, id, objp, propp);
}
static JSBool
with_GetProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_GetProperty(cx, obj, id, vp);
return OBJ_GET_PROPERTY(cx, proto, id, vp);
}
static JSBool
with_SetProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_SetProperty(cx, obj, id, vp);
return OBJ_SET_PROPERTY(cx, proto, id, vp);
}
static JSBool
with_GetAttributes(JSContext *cx, JSObject *obj, jsid id, JSProperty *prop,
uintN *attrsp)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_GetAttributes(cx, obj, id, prop, attrsp);
return OBJ_GET_ATTRIBUTES(cx, proto, id, prop, attrsp);
}
static JSBool
with_SetAttributes(JSContext *cx, JSObject *obj, jsid id, JSProperty *prop,
uintN *attrsp)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_SetAttributes(cx, obj, id, prop, attrsp);
return OBJ_SET_ATTRIBUTES(cx, proto, id, prop, attrsp);
}
static JSBool
with_DeleteProperty(JSContext *cx, JSObject *obj, jsid id, jsval *rval)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_DeleteProperty(cx, obj, id, rval);
return OBJ_DELETE_PROPERTY(cx, proto, id, rval);
}
static JSBool
with_DefaultValue(JSContext *cx, JSObject *obj, JSType hint, jsval *vp)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_DefaultValue(cx, obj, hint, vp);
return OBJ_DEFAULT_VALUE(cx, proto, hint, vp);
}
static JSBool
with_Enumerate(JSContext *cx, JSObject *obj, JSIterateOp enum_op,
jsval *statep, jsid *idp)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_Enumerate(cx, obj, enum_op, statep, idp);
return OBJ_ENUMERATE(cx, proto, enum_op, statep, idp);
}
static JSBool
with_CheckAccess(JSContext *cx, JSObject *obj, jsid id, JSAccessMode mode,
jsval *vp, uintN *attrsp)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return js_CheckAccess(cx, obj, id, mode, vp, attrsp);
return OBJ_CHECK_ACCESS(cx, proto, id, mode, vp, attrsp);
}
static JSObject *
with_ThisObject(JSContext *cx, JSObject *obj)
{
JSObject *proto = OBJ_GET_PROTO(cx, obj);
if (!proto)
return obj;
return OBJ_THIS_OBJECT(cx, proto);
}
JS_FRIEND_DATA(JSObjectOps) js_WithObjectOps = {
js_NewObjectMap, js_DestroyObjectMap,
with_LookupProperty, js_DefineProperty,
with_GetProperty, with_SetProperty,
with_GetAttributes, with_SetAttributes,
with_DeleteProperty, with_DefaultValue,
with_Enumerate, with_CheckAccess,
with_ThisObject, NATIVE_DROP_PROPERTY,
0,0,0,0,{0,0}
};
static JSObjectOps *
with_getObjectOps(JSContext *cx, JSClass *clasp)
{
return &js_WithObjectOps;
}
JSClass js_WithClass = {
"With",
0,
JS_PropertyStub, JS_PropertyStub, JS_PropertyStub, JS_PropertyStub,
JS_EnumerateStub, JS_ResolveStub, JS_ConvertStub, JS_FinalizeStub,
with_getObjectOps,
0,0,0,0,0,{0,0}
};
#if JS_HAS_OBJ_PROTO_PROP
static JSBool
With(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
JSObject *parent, *proto;
jsval v;
if (!cx->fp->constructing) {
obj = js_NewObject(cx, &js_WithClass, NULL, NULL);
if (!obj)
return JS_FALSE;
*rval = OBJECT_TO_JSVAL(obj);
}
parent = cx->fp->scopeChain;
if (argc > 0) {
if (!js_ValueToObject(cx, argv[0], &proto))
return JS_FALSE;
v = OBJECT_TO_JSVAL(proto);
if (!obj_setSlot(cx, obj, INT_TO_JSVAL(JSSLOT_PROTO), &v))
return JS_FALSE;
if (argc > 1) {
if (!js_ValueToObject(cx, argv[1], &parent))
return JS_FALSE;
}
}
v = OBJECT_TO_JSVAL(parent);
return obj_setSlot(cx, obj, INT_TO_JSVAL(JSSLOT_PARENT), &v);
}
#endif
JSObject *
js_InitObjectClass(JSContext *cx, JSObject *obj)
{
JSObject *proto;
#if JS_HAS_SHARP_VARS
JS_ASSERT(sizeof(jsatomid) * JS_BITS_PER_BYTE >= ATOM_INDEX_LIMIT_LOG2 + 1);
#endif
proto = JS_InitClass(cx, obj, NULL, &js_ObjectClass, Object, 1,
object_props, object_methods, NULL, NULL);
#if JS_HAS_OBJ_PROTO_PROP
if (!JS_InitClass(cx, obj, NULL, &js_WithClass, With, 0,
NULL, NULL, NULL, NULL)) {
return NULL;
}
#endif
return proto;
}
void
js_InitObjectMap(JSObjectMap *map, jsrefcount nrefs, JSObjectOps *ops,
JSClass *clasp)
{
map->nrefs = nrefs;
map->ops = ops;
map->nslots = 0;
map->freeslot = JSSLOT_FREE(clasp);
}
JSObjectMap *
js_NewObjectMap(JSContext *cx, jsrefcount nrefs, JSObjectOps *ops,
JSClass *clasp, JSObject *obj)
{
return (JSObjectMap *) js_NewScope(cx, nrefs, ops, clasp, obj);
}
void
js_DestroyObjectMap(JSContext *cx, JSObjectMap *map)
{
js_DestroyScope(cx, (JSScope *)map);
}
JSObjectMap *
js_HoldObjectMap(JSContext *cx, JSObjectMap *map)
{
JS_ASSERT(map->nrefs >= 0);
JS_ATOMIC_ADDREF(&map->nrefs, 1);
return map;
}
JSObjectMap *
js_DropObjectMap(JSContext *cx, JSObjectMap *map, JSObject *obj)
{
JS_ASSERT(map->nrefs > 0);
JS_ATOMIC_ADDREF(&map->nrefs, -1);
if (map->nrefs == 0) {
map->ops->destroyObjectMap(cx, map);
return NULL;
}
if (MAP_IS_NATIVE(map) && ((JSScope *)map)->object == obj)
((JSScope *)map)->object = NULL;
return map;
}
JSObject *
js_NewObject(JSContext *cx, JSClass *clasp, JSObject *proto, JSObject *parent)
{
JSObject *obj, *ctor;
JSObjectOps *ops;
JSObjectMap *map;
jsval cval;
uint32 i;
/* Allocate an object from the GC heap and zero it. */
obj = js_AllocGCThing(cx, GCX_OBJECT);
if (!obj)
return NULL;
/* Bootstrap the ur-object, and make it the default prototype object. */
if (!proto) {
if (!js_GetClassPrototype(cx, clasp->name, &proto))
goto bad;
if (!proto && !js_GetClassPrototype(cx, js_ObjectClass.name, &proto))
goto bad;
}
/* Always call the class's getObjectOps hook if it has one. */
ops = clasp->getObjectOps
? clasp->getObjectOps(cx, clasp)
: &js_ObjectOps;
if (proto && (map = proto->map)->ops == ops) {
/* Default parent to the parent of the prototype's constructor. */
if (!parent) {
if (!OBJ_GET_PROPERTY(cx, proto,
(jsid)cx->runtime->atomState.constructorAtom,
&cval)) {
goto bad;
}
if (JSVAL_IS_OBJECT(cval) && (ctor = JSVAL_TO_OBJECT(cval)) != NULL)
parent = OBJ_GET_PARENT(cx, ctor);
}
/* Share the given prototype's map. */
obj->map = js_HoldObjectMap(cx, map);
} else {
/* Leave parent alone. Allocate a new map for obj. */
map = ops->newObjectMap(cx, 1, ops, clasp, obj);
if (!map)
goto bad;
if (map->nslots == 0)
map->nslots = JS_INITIAL_NSLOTS;
obj->map = map;
}
/* Set the proto, parent, and class properties. */
obj->slots = JS_malloc(cx, JS_INITIAL_NSLOTS * sizeof(jsval));
if (!obj->slots)
goto bad;
obj->slots[JSSLOT_PROTO] = OBJECT_TO_JSVAL(proto);
obj->slots[JSSLOT_PARENT] = OBJECT_TO_JSVAL(parent);
obj->slots[JSSLOT_CLASS] = PRIVATE_TO_JSVAL(clasp);
for (i = JSSLOT_CLASS+1; i < JS_INITIAL_NSLOTS; i++)
obj->slots[i] = JSVAL_VOID;
if (cx->runtime->objectHook) {
cx->runtime->objectHook(cx, obj, JS_TRUE, cx->runtime->objectHookData);
}
return obj;
bad:
cx->newborn[GCX_OBJECT] = NULL;
return NULL;
}
static JSBool
FindConstructor(JSContext *cx, const char *name, jsval *vp)
{
JSAtom *atom;
JSObject *obj, *tmp;
JSObject *pobj;
JSScopeProperty *sprop;
atom = js_Atomize(cx, name, strlen(name), 0);
if (!atom)
return JS_FALSE;
if (cx->fp && (tmp = cx->fp->scopeChain) != NULL) {
/* Find the topmost object in the scope chain. */
do {
obj = tmp;
tmp = OBJ_GET_PARENT(cx, obj);
} while (tmp);
} else {
obj = cx->globalObject;
if (!obj) {
*vp = JSVAL_VOID;
return JS_TRUE;
}
}
if (!OBJ_LOOKUP_PROPERTY(cx, obj, (jsid)atom, &pobj, (JSProperty**)&sprop))
return JS_FALSE;
if (!sprop) {
*vp = JSVAL_VOID;
return JS_TRUE;
}
JS_ASSERT(OBJ_IS_NATIVE(pobj));
*vp = OBJ_GET_SLOT(cx, pobj, sprop->slot);
OBJ_DROP_PROPERTY(cx, pobj, (JSProperty *)sprop);
return JS_TRUE;
}
JSObject *
js_ConstructObject(JSContext *cx, JSClass *clasp, JSObject *proto,
JSObject *parent)
{
JSObject *obj, *ctor;
JSBool ok;
jsval cval, *sp, *oldsp, rval;
void *mark;
JSStackFrame *fp;
ok = FindConstructor(cx, clasp->name, &cval);
if (!ok)
return NULL;
/*
* If proto or parent are NULL, set them to Constructor.prototype and/or
* Constructor.__parent__, just like JSOP_NEW does.
*/
ctor = JSVAL_TO_OBJECT(cval);
if (!parent)
parent = OBJ_GET_PARENT(cx, ctor);
if (!proto) {
if (!OBJ_GET_PROPERTY(cx, ctor,
(jsid)cx->runtime->atomState.classPrototypeAtom,
&rval)) {
return NULL;
}
if (JSVAL_IS_OBJECT(rval))
proto = JSVAL_TO_OBJECT(rval);
}
obj = js_NewObject(cx, clasp, proto, parent);
if (!obj)
return NULL;
/* Allocate stack space for cval and obj, then push them. */
sp = js_AllocStack(cx, 2, &mark);
if (!sp)
goto bad;
*sp++ = cval;
*sp++ = OBJECT_TO_JSVAL(obj);
/* Lift current frame to include the args and do the call. */
fp = cx->fp;
oldsp = fp->sp;
fp->sp = sp;
ok = js_Invoke(cx, 0, JSINVOKE_CONSTRUCT | JSINVOKE_INTERNAL);
rval = sp[-1];
fp->sp = oldsp;
js_FreeStack(cx, mark);
if (!ok)
goto bad;
return JSVAL_IS_OBJECT(rval) ? JSVAL_TO_OBJECT(rval) : obj;
bad:
cx->newborn[GCX_OBJECT] = NULL;
return NULL;
}
void
js_FinalizeObject(JSContext *cx, JSObject *obj)
{
JSObjectMap *map;
/* Cope with stillborn objects that have no map. */
map = obj->map;
if (!map)
return;
if (cx->runtime->objectHook) {
cx->runtime->objectHook(cx, obj, JS_FALSE, cx->runtime->objectHookData);
}
#if JS_HAS_OBJ_WATCHPOINT
/* Remove all watchpoints with weak links to obj. */
JS_ClearWatchPointsForObject(cx, obj);
#endif
/* Finalize obj first, in case it needs map and slots. */
OBJ_GET_CLASS(cx, obj)->finalize(cx, obj);
/* Drop map and free slots. */
js_DropObjectMap(cx, map, obj);
obj->map = NULL;
JS_free(cx, obj->slots);
obj->slots = NULL;
}
JSBool
js_AllocSlot(JSContext *cx, JSObject *obj, uint32 *slotp)
{
JSObjectMap *map;
uint32 nslots;
size_t nbytes;
jsval *newslots;
map = obj->map;
nslots = map->nslots;
if (map->freeslot >= nslots) {
nslots = JS_MAX(map->freeslot, nslots);
if (nslots < JS_INITIAL_NSLOTS)
nslots = JS_INITIAL_NSLOTS;
else
nslots += (nslots + 1) / 2;
nbytes = (size_t)nslots * sizeof(jsval);
#if defined(XP_PC) && defined _MSC_VER && _MSC_VER <= 800
if (nbytes > 60000U) {
JS_ReportOutOfMemory(cx);
return JS_FALSE;
}
#endif
if (obj->slots) {
newslots = JS_realloc(cx, obj->slots, nbytes);
} else {
/* obj must be newborn and unshared at this point. */
newslots = JS_malloc(cx, nbytes);
}
if (!newslots)
return JS_FALSE;
obj->slots = newslots;
map->nslots = nslots;
}
#ifdef TOO_MUCH_GC
obj->slots[map->freeslot] = JSVAL_VOID;
#endif
*slotp = map->freeslot++;
return JS_TRUE;
}
void
js_FreeSlot(JSContext *cx, JSObject *obj, uint32 slot)
{
JSObjectMap *map;
uint32 nslots;
size_t nbytes;
jsval *newslots;
obj->slots[slot] = JSVAL_VOID;
map = obj->map;
if (map->freeslot == slot + 1)
map->freeslot = slot;
nslots = map->nslots;
if (nslots > JS_INITIAL_NSLOTS && map->freeslot < nslots / 2) {
nslots = map->freeslot;
nslots += nslots / 2;
nbytes = (size_t)nslots * sizeof(jsval);
newslots = JS_realloc(cx, obj->slots, nbytes);
if (!newslots)
return;
obj->slots = newslots;
map->nslots = nslots;
}
}
#if JS_BUG_EMPTY_INDEX_ZERO
#define CHECK_FOR_EMPTY_INDEX(id) \
JS_BEGIN_MACRO \
if (_str->length == 0) \
id = JSVAL_ZERO; \
JS_END_MACRO
#else
#define CHECK_FOR_EMPTY_INDEX(id) /* nothing */
#endif
/* JSVAL_INT_MAX as a string */
#define JSVAL_INT_MAX_STRING "1073741823"
#define CHECK_FOR_FUNNY_INDEX(id) \
JS_BEGIN_MACRO \
if (!JSVAL_IS_INT(id)) { \
JSAtom *_atom = (JSAtom *)id; \
JSString *_str = ATOM_TO_STRING(_atom); \
const jschar *_cp = _str->chars; \
if (JS7_ISDEC(*_cp) && \
_str->length <= sizeof(JSVAL_INT_MAX_STRING)-1) \
{ \
jsuint _index = JS7_UNDEC(*_cp++); \
jsuint _oldIndex = 0; \
jsuint _c = 0; \
if (_index != 0) { \
while (JS7_ISDEC(*_cp)) { \
_oldIndex = _index; \
_c = JS7_UNDEC(*_cp); \
_index = 10*_index + _c; \
_cp++; \
} \
} \
if (*_cp == 0 && \
(_oldIndex < (JSVAL_INT_MAX / 10) || \
(_oldIndex == (JSVAL_INT_MAX / 10) && \
_c < (JSVAL_INT_MAX % 10)))) \
id = INT_TO_JSVAL(_index); \
} else { \
CHECK_FOR_EMPTY_INDEX(id); \
} \
} \
JS_END_MACRO
JSBool
js_DefineProperty(JSContext *cx, JSObject *obj, jsid id, jsval value,
JSPropertyOp getter, JSPropertyOp setter, uintN attrs,
JSProperty **propp)
{
JSClass *clasp;
JSScope *scope;
JSScopeProperty *sprop;
/*
* Handle old bug that treated empty string as zero index.
* Also convert string indices to numbers if applicable.
*/
CHECK_FOR_FUNNY_INDEX(id);
/* Lock if object locking is required by this implementation. */
JS_LOCK_OBJ(cx, obj);
#if JS_HAS_GETTER_SETTER
/*
* If defining a getter or setter, we must check for its counterpart and
* update the attributes and property ops. A getter or setter is really
* only half of a property.
*/
if (attrs & (JSPROP_GETTER | JSPROP_SETTER)) {
JSObject *pobj;
if (!js_LookupProperty(cx, obj, id, &pobj, (JSProperty **)&sprop))
goto bad;
if (sprop &&
pobj == obj &&
(sprop->attrs & (JSPROP_GETTER | JSPROP_SETTER))) {
sprop->attrs |= attrs;
if (attrs & JSPROP_GETTER)
SPROP_GETTER(sprop, pobj) = getter;
else
SPROP_SETTER(sprop, pobj) = setter;
if (propp)
*propp = (JSProperty *) sprop;
#ifdef JS_THREADSAFE
else {
/* Release sprop and the lock acquired by js_LookupProperty. */
js_DropProperty(cx, obj, (JSProperty *)sprop);
}
#endif
/* Release our lock on obj, in which js_LookupProperty's nested. */
JS_UNLOCK_OBJ(cx, obj);
return JS_TRUE;
}
}
#endif /* JS_HAS_GETTER_SETTER */
/* Use the object's class getter and setter by default. */
clasp = LOCKED_OBJ_GET_CLASS(obj);
if (!getter)
getter = clasp->getProperty;
if (!setter)
setter = clasp->setProperty;
/* Find a sharable scope, or get a new one for obj. */
scope = js_MutateScope(cx, obj, id, getter, setter, attrs, &sprop);
if (!scope)
goto bad;
/* Add the property only if MutateScope didn't find a shared scope. */
if (!sprop) {
sprop = js_NewScopeProperty(cx, scope, id, getter, setter, attrs);
if (!sprop)
goto bad;
/* XXXbe called with lock held */
if (!clasp->addProperty(cx, obj, sprop->id, &value) ||
!scope->ops->add(cx, scope, id, sprop)) {
js_DestroyScopeProperty(cx, scope, sprop);
goto bad;
}
PROPERTY_CACHE_FILL(cx, &cx->runtime->propertyCache, obj, id,
(JSProperty *)sprop);
}
LOCKED_OBJ_SET_SLOT(obj, sprop->slot, value);
if (propp) {
#ifdef JS_THREADSAFE
js_HoldScopeProperty(cx, scope, sprop);
#endif
*propp = (JSProperty *) sprop;
} else {
JS_UNLOCK_OBJ(cx, obj);
}
return JS_TRUE;
bad:
JS_UNLOCK_OBJ(cx, obj);
return JS_FALSE;
}
#if defined JS_THREADSAFE && defined DEBUG
JS_FRIEND_API(JSBool)
_js_LookupProperty(JSContext *cx, JSObject *obj, jsid id, JSObject **objp,
JSProperty **propp, const char *file, uintN line)
#else
JS_FRIEND_API(JSBool)
js_LookupProperty(JSContext *cx, JSObject *obj, jsid id, JSObject **objp,
JSProperty **propp)
#endif
{
JSHashNumber hash;
JSScope *prevscope, *scope;
JSSymbol *sym;
JSClass *clasp;
JSResolveOp resolve;
JSNewResolveOp newresolve;
uintN flags;
uint32 format;
JSObject *obj2, *proto;
JSScopeProperty *sprop;
/*
* Handle old bug that treated empty string as zero index.
* Also convert string indices to numbers if applicable.
*/
CHECK_FOR_FUNNY_INDEX(id);
/* Search scopes starting with obj and following the prototype link. */
hash = js_HashValue(id);
prevscope = NULL;
for (;;) {
JS_LOCK_OBJ(cx, obj);
_SET_OBJ_INFO(obj, file, line);
scope = OBJ_SCOPE(obj);
if (scope == prevscope)
goto skip;
sym = scope->ops->lookup(cx, scope, id, hash);
if (!sym) {
clasp = LOCKED_OBJ_GET_CLASS(obj);
resolve = clasp->resolve;
if (resolve != JS_ResolveStub) {
if (clasp->flags & JSCLASS_NEW_RESOLVE) {
newresolve = (JSNewResolveOp)resolve;
flags = 0;
if (cx->fp && cx->fp->pc) {
format = js_CodeSpec[*cx->fp->pc].format;
if ((format & JOF_MODEMASK) != JOF_NAME)
flags |= JSRESOLVE_QUALIFIED;
if (format & JOF_SET)
flags |= JSRESOLVE_ASSIGNING;
}
obj2 = NULL;
JS_UNLOCK_OBJ(cx, obj);
if (!newresolve(cx, obj, js_IdToValue(id), flags, &obj2))
return JS_FALSE;
JS_LOCK_OBJ(cx, obj);
_SET_OBJ_INFO(obj, file, line);
if (obj2) {
scope = OBJ_SCOPE(obj2);
if (MAP_IS_NATIVE(&scope->map))
sym = scope->ops->lookup(cx, scope, id, hash);
}
} else {
JS_UNLOCK_OBJ(cx, obj);
if (!resolve(cx, obj, js_IdToValue(id)))
return JS_FALSE;
JS_LOCK_OBJ(cx, obj);
_SET_OBJ_INFO(obj, file, line);
scope = OBJ_SCOPE(obj);
if (MAP_IS_NATIVE(&scope->map))
sym = scope->ops->lookup(cx, scope, id, hash);
}
}
}
if (sym && (sprop = sym_property(sym)) != NULL) {
JS_ASSERT(OBJ_SCOPE(obj) == scope);
*objp = scope->object; /* XXXbe hide in jsscope.[ch] */
#ifdef JS_THREADSAFE
js_HoldScopeProperty(cx, scope, sprop);
#endif
*propp = (JSProperty *) sprop;
return JS_TRUE;
}
prevscope = scope;
skip:
proto = LOCKED_OBJ_GET_PROTO(obj);
JS_UNLOCK_OBJ(cx, obj);
if (!proto)
break;
if (!OBJ_IS_NATIVE(proto))
return OBJ_LOOKUP_PROPERTY(cx, proto, id, objp, propp);
obj = proto;
}
*objp = NULL;
*propp = NULL;
return JS_TRUE;
}
JS_FRIEND_API(JSBool)
js_FindProperty(JSContext *cx, jsid id, JSObject **objp, JSObject **pobjp,
JSProperty **propp)
{
JSRuntime *rt;
JSObject *obj, *pobj, *parent, *lastobj;
JSProperty *prop;
rt = cx->runtime;
lastobj = NULL; /* Suppress gcc warning */
for (obj = cx->fp->scopeChain; obj; obj = parent) {
/* Try the property cache and return immediately on cache hit. */
PROPERTY_CACHE_TEST(&rt->propertyCache, obj, id, prop);
if (PROP_FOUND(prop)) {
#ifdef JS_THREADSAFE
JS_ASSERT(OBJ_IS_NATIVE(obj));
JS_LOCK_OBJ(cx, obj);
JS_ATOMIC_ADDREF(&((JSScopeProperty *)prop)->nrefs, 1);
#endif
*objp = obj;
*pobjp = obj;
*propp = prop;
return JS_TRUE;
}
/* If cache miss (not cached-as-not-found), take the slow path. */
if (!prop) {
if (!OBJ_LOOKUP_PROPERTY(cx, obj, id, &pobj, &prop))
return JS_FALSE;
if (prop) {
PROPERTY_CACHE_FILL(cx, &rt->propertyCache, pobj, id, prop);
*objp = obj;
*pobjp = pobj;
*propp = prop;
return JS_TRUE;
}
/* No such property -- cache obj[id] as not-found. */
PROPERTY_CACHE_FILL(cx, &rt->propertyCache, obj, id,
PROP_NOT_FOUND(obj, id));
}
parent = OBJ_GET_PARENT(cx, obj);
lastobj = obj;
}
*objp = lastobj;
*pobjp = NULL;
*propp = NULL;
return JS_TRUE;
}
JSBool
js_FindVariable(JSContext *cx, jsid id, JSObject **objp, JSObject **pobjp,
JSProperty **propp)
{
JSObject *obj;
JSProperty *prop;
/*
* First look for id's property along the "with" statement and the
* statically-linked scope chains.
*/
if (!js_FindProperty(cx, id, objp, pobjp, propp))
return JS_FALSE;
if (*propp)
return JS_TRUE;
/*
* Use the top-level scope from the scope chain, which won't end in the
* same scope as cx->globalObject for cross-context function calls.
*/
obj = *objp;
JS_ASSERT(obj);
/*
* Make a top-level variable.
*/
if (JS_HAS_STRICT_OPTION(cx)) {
JSString *str = JSVAL_TO_STRING(js_IdToValue(id));
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_UNDECLARED_VAR, JS_GetStringBytes(str));
return JS_FALSE;
}
if (!OBJ_DEFINE_PROPERTY(cx, obj, id, JSVAL_VOID, NULL, NULL,
JSPROP_ENUMERATE, &prop)) {
return JS_FALSE;
}
*pobjp = obj;
*propp = prop;
return JS_TRUE;
}
JSObject *
js_FindVariableScope(JSContext *cx, JSFunction **funp)
{
JSStackFrame *fp;
JSObject *obj, *parent, *withobj;
JSClass *clasp;
JSFunction *fun;
fp = cx->fp;
withobj = NULL;
for (obj = fp->scopeChain; ; obj = parent) {
parent = OBJ_GET_PARENT(cx, obj);
clasp = OBJ_GET_CLASS(cx, obj);
if (!parent || clasp != &js_WithClass)
break;
withobj = obj;
}
fun = (clasp == &js_FunctionClass) ? JS_GetPrivate(cx, obj) : NULL;
#if JS_HAS_CALL_OBJECT
if (fun && fun->script) {
for (; fp && fp->fun != fun; fp = fp->down)
;
if (fp)
obj = js_GetCallObject(cx, fp, parent, withobj);
} else if (clasp == &js_CallClass) {
fp = (JSStackFrame *) JS_GetPrivate(cx, obj);
fun = fp->fun;
}
#endif
*funp = fun;
return obj;
}
JSBool
js_GetProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp)
{
JSObject *obj2;
JSScopeProperty *sprop;
jsint slot;
if (!js_LookupProperty(cx, obj, id, &obj2, (JSProperty **)&sprop))
return JS_FALSE;
if (!sprop) {
/*
* Handle old bug that treated empty string as zero index.
* Also convert string indices to numbers if applicable.
*/
CHECK_FOR_FUNNY_INDEX(id);
#if JS_BUG_NULL_INDEX_PROPS
/* Indexed properties defaulted to null in old versions. */
*vp = (JSVAL_IS_INT(id) && JSVAL_TO_INT(id) >= 0)
? JSVAL_NULL
: JSVAL_VOID;
#else
*vp = JSVAL_VOID;
#endif
return OBJ_GET_CLASS(cx, obj)->getProperty(cx, obj, js_IdToValue(id),
vp);
}
if (!OBJ_IS_NATIVE(obj2)) {
OBJ_DROP_PROPERTY(cx, obj2, (JSProperty *)sprop);
return OBJ_GET_PROPERTY(cx, obj2, id, vp);
}
/* Unlock obj2 before calling getter, relock after to avoid deadlock. */
slot = sprop->slot;
*vp = LOCKED_OBJ_GET_SLOT(obj2, slot);
JS_UNLOCK_OBJ(cx, obj2);
if (!SPROP_GET(cx, sprop, obj, obj2, vp)) {
JS_LOCK_OBJ(cx, obj2);
OBJ_DROP_PROPERTY(cx, obj2, (JSProperty *)sprop);
return JS_FALSE;
}
JS_LOCK_OBJ(cx, obj2);
LOCKED_OBJ_SET_SLOT(obj2, slot, *vp);
PROPERTY_CACHE_FILL(cx, &cx->runtime->propertyCache, obj2, id,
(JSProperty *)sprop);
OBJ_DROP_PROPERTY(cx, obj2, (JSProperty *)sprop);
return JS_TRUE;
}
JSBool
js_SetProperty(JSContext *cx, JSObject *obj, jsid id, jsval *vp)
{
JSRuntime *rt;
JSScope *scope, *protoscope;
JSScopeProperty *sprop, *protosprop;
JSHashNumber hash;
JSSymbol *sym, *protosym;
JSObject *proto, *tmp;
jsval protoid;
JSPropertyOp protogetter, protosetter;
uintN protoattrs;
JSClass *clasp;
jsval pval;
uint32 slot;
JSString *str;
rt = cx->runtime;
JS_LOCK_OBJ(cx, obj);
protoid = protoattrs = 0; /* Suppress use-before-set gcc warning */
protogetter = protosetter = NULL; /* Suppress use-before-set gcc warning */
scope = js_GetMutableScope(cx, obj);
if (!scope) {
JS_UNLOCK_OBJ(cx, obj);
return JS_FALSE;
}
/*
* Handle old bug that treated empty string as zero index.
* Also convert string indices to numbers if applicable.
*/
CHECK_FOR_FUNNY_INDEX(id);
hash = js_HashValue(id);
sym = scope->ops->lookup(cx, scope, id, hash);
if (sym) {
sprop = sym_property(sym);
#if JS_HAS_OBJ_WATCHPOINT
if (!sprop) {
uint32 nslots;
jsval *slots;
/*
* Deleted property place-holder, could have a watchpoint that
* holds the deleted-but-watched property. If so, slots may have
* shrunk, or at least freeslot may have shrunk due to the delete
* operation destroying the property.
*/
sprop = js_FindWatchPoint(rt, obj, js_IdToValue(id));
if (sprop && (slot = sprop->slot) >= scope->map.freeslot) {
if (slot >= scope->map.nslots) {
nslots = slot + slot / 2;
slots = JS_realloc(cx, obj->slots, nslots * sizeof(jsval));
if (!slots) {
JS_UNLOCK_OBJ(cx, obj);
return JS_FALSE;
}
scope->map.nslots = nslots;
obj->slots = slots;
}
scope->map.freeslot = slot + 1;
}
}
#endif
} else {
sprop = NULL;
}
if (!sprop) {
/* Find a prototype property with the same id. */
proto = LOCKED_OBJ_GET_PROTO(obj);
protosprop = NULL;
JS_UNLOCK_OBJ(cx, obj);
while (proto) {
JS_LOCK_OBJ(cx, proto);
protoscope = OBJ_SCOPE(proto);
if (MAP_IS_NATIVE(&protoscope->map)) {
protosym = protoscope->ops->lookup(cx, protoscope, id, hash);
if (protosym) {
protosprop = sym_property(protosym);
if (protosprop) {
protoattrs = protosprop->attrs;
#if JS_HAS_GETTER_SETTER
if (protoattrs & JSPROP_SETTER) {
JSBool ok;
#ifdef JS_THREADSAFE
JS_ATOMIC_ADDREF(&protosprop->nrefs, 1);
#endif
JS_UNLOCK_OBJ(cx, proto);
ok = SPROP_SET(cx, protosprop, obj, obj, vp);
#ifdef JS_THREADSAFE
JS_LOCK_OBJ_VOID(cx, proto,
js_DropScopeProperty(cx,
protoscope,
protosprop));
#endif
return ok;
}
#endif /* JS_HAS_GETTER_SETTER */
protoid = protosprop->id;
protogetter = SPROP_GETTER_SCOPE(protosprop,protoscope);
protosetter = SPROP_SETTER_SCOPE(protosprop,protoscope);
JS_UNLOCK_OBJ(cx, proto);
break;
}
}
}
tmp = LOCKED_OBJ_GET_PROTO(proto);
JS_UNLOCK_OBJ(cx, proto);
proto = tmp;
}
JS_LOCK_OBJ(cx, obj);
/* Make a new property descriptor with the right heritage. */
clasp = LOCKED_OBJ_GET_CLASS(obj);
if (protosprop) {
if (protoattrs & JSPROP_READONLY)
goto read_only;
sprop = js_NewScopeProperty(cx, scope, id,
protogetter, protosetter,
protoattrs);
sprop->id = protoid;
} else {
sprop = js_NewScopeProperty(cx, scope, id,
clasp->getProperty, clasp->setProperty,
JSPROP_ENUMERATE);
}
if (!sprop) {
JS_UNLOCK_OBJ(cx, obj);
return JS_FALSE;
}
/* XXXbe called with obj locked */
if (!clasp->addProperty(cx, obj, sprop->id, vp)) {
js_DestroyScopeProperty(cx, scope, sprop);
JS_UNLOCK_OBJ(cx, obj);
return JS_FALSE;
}
/* Initialize new properties to undefined. */
LOCKED_OBJ_SET_SLOT(obj, sprop->slot, JSVAL_VOID);
if (sym) {
/* Null-valued symbol left behind from a delete operation. */
sym->entry.value = js_HoldScopeProperty(cx, scope, sprop);
}
}
if (!sym) {
/* Need a new symbol as well as a new property. */
sym = scope->ops->add(cx, scope, id, sprop);
if (!sym) {
js_DestroyScopeProperty(cx, scope, sprop);
JS_UNLOCK_OBJ(cx, obj);
return JS_FALSE;
}
#if JS_BUG_AUTO_INDEX_PROPS
{
jsid id2 = (jsid) INT_TO_JSVAL(sprop->slot - JSSLOT_START);
if (!scope->ops->add(cx, scope, id2, sprop)) {
scope->ops->remove(cx, scope, id);
JS_UNLOCK_OBJ(cx, obj);
return JS_FALSE;
}
PROPERTY_CACHE_FILL(cx, &rt->propertyCache, obj, id2,
(JSProperty *)sprop);
}
#endif
PROPERTY_CACHE_FILL(cx, &rt->propertyCache, obj, id,
(JSProperty *)sprop);
}
/* Check for readonly now that we have sprop. */
if (sprop->attrs & JSPROP_READONLY) {
read_only:
JS_UNLOCK_OBJ(cx, obj);
if (JSVERSION_IS_ECMA(cx->version))
return JS_TRUE;
str = js_DecompileValueGenerator(cx, JS_FALSE, js_IdToValue(id), NULL);
if (str) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_READ_ONLY, JS_GetStringBytes(str));
}
return JS_FALSE;
}
/* Get the current property value from its slot. */
JS_ASSERT(sprop->slot < obj->map->freeslot);
slot = sprop->slot;
pval = LOCKED_OBJ_GET_SLOT(obj, slot);
#ifdef JS_THREADSAFE
/* Hold sprop across setter callout, and drop after, in case of delete. */
JS_ATOMIC_ADDREF(&sprop->nrefs, 1);
#endif
/* Avoid deadlock by unlocking obj while calling sprop's setter. */
JS_UNLOCK_OBJ(cx, obj);
/* Let the setter modify vp before copying from it to obj->slots[slot]. */
if (!SPROP_SET(cx, sprop, obj, obj, vp)) {
#ifdef JS_THREADSAFE
JS_LOCK_OBJ_VOID(cx, obj, js_DropScopeProperty(cx, scope, sprop));
#endif
return JS_FALSE;
}
/* Relock obj until we are done with sprop. */
JS_LOCK_OBJ(cx, obj);
#ifdef JS_THREADSAFE
sprop = js_DropScopeProperty(cx, scope, sprop);
if (!sprop) {
/* Lost a race with someone who deleted sprop. */
JS_UNLOCK_OBJ(cx, obj);
return JS_TRUE;
}
#endif
GC_POKE(cx, pval);
LOCKED_OBJ_SET_SLOT(obj, slot, *vp);
#if JS_BUG_SET_ENUMERATE
/* Setting a property makes it enumerable. */
sprop->attrs |= JSPROP_ENUMERATE;
#endif
JS_UNLOCK_OBJ(cx, obj);
return JS_TRUE;
}
JSBool
js_GetAttributes(JSContext *cx, JSObject *obj, jsid id, JSProperty *prop,
uintN *attrsp)
{
JSBool noprop, ok;
JSScopeProperty *sprop;
noprop = !prop;
if (noprop) {
if (!js_LookupProperty(cx, obj, id, &obj, &prop))
return JS_FALSE;
if (!prop) {
*attrsp = 0;
return JS_TRUE;
}
if (!OBJ_IS_NATIVE(obj)) {
ok = OBJ_GET_ATTRIBUTES(cx, obj, id, prop, attrsp);
OBJ_DROP_PROPERTY(cx, obj, prop);
return ok;
}
}
sprop = (JSScopeProperty *)prop;
*attrsp = sprop->attrs;
if (noprop)
OBJ_DROP_PROPERTY(cx, obj, prop);
return JS_TRUE;
}
JSBool
js_SetAttributes(JSContext *cx, JSObject *obj, jsid id, JSProperty *prop,
uintN *attrsp)
{
JSBool noprop, ok;
JSScopeProperty *sprop;
noprop = !prop;
if (noprop) {
if (!js_LookupProperty(cx, obj, id, &obj, &prop))
return JS_FALSE;
if (!prop)
return JS_TRUE;
if (!OBJ_IS_NATIVE(obj)) {
ok = OBJ_SET_ATTRIBUTES(cx, obj, id, prop, attrsp);
OBJ_DROP_PROPERTY(cx, obj, prop);
return ok;
}
}
sprop = (JSScopeProperty *)prop;
sprop->attrs = *attrsp;
if (noprop)
OBJ_DROP_PROPERTY(cx, obj, prop);
return JS_TRUE;
}
JSBool
js_DeleteProperty(JSContext *cx, JSObject *obj, jsid id, jsval *rval)
{
#if JS_HAS_PROP_DELETE
JSRuntime *rt;
JSObject *proto;
JSProperty *prop;
JSScopeProperty *sprop;
JSString *str;
JSScope *scope;
JSSymbol *sym;
rt = cx->runtime;
*rval = JSVERSION_IS_ECMA(cx->version) ? JSVAL_TRUE : JSVAL_VOID;
/*
* Handle old bug that treated empty string as zero index.
* Also convert string indices to numbers if applicable.
*/
CHECK_FOR_FUNNY_INDEX(id);
if (!js_LookupProperty(cx, obj, id, &proto, &prop))
return JS_FALSE;
if (!prop || proto != obj) {
if (prop)
OBJ_DROP_PROPERTY(cx, proto, prop);
/*
* If no property, or the property comes from a prototype, call the
* class's delProperty hook with rval as the result parameter.
*/
return OBJ_GET_CLASS(cx, obj)->delProperty(cx, obj, js_IdToValue(id),
rval);
}
sprop = (JSScopeProperty *)prop;
if (sprop->attrs & JSPROP_PERMANENT) {
OBJ_DROP_PROPERTY(cx, obj, prop);
if (JSVERSION_IS_ECMA(cx->version)) {
*rval = JSVAL_FALSE;
return JS_TRUE;
}
str = js_DecompileValueGenerator(cx, JS_FALSE, js_IdToValue(id), NULL);
if (str) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_PERMANENT, JS_GetStringBytes(str));
}
return JS_FALSE;
}
/* XXXbe called with obj locked */
if (!LOCKED_OBJ_GET_CLASS(obj)->delProperty(cx, obj, sprop->id, rval)) {
OBJ_DROP_PROPERTY(cx, obj, prop);
return JS_FALSE;
}
GC_POKE(cx, LOCKED_OBJ_GET_SLOT(obj, sprop->slot));
scope = OBJ_SCOPE(obj);
/*
* Purge cache only if prop is not about to be destroyed (since
* js_DestroyScopeProperty purges for us).
*/
if (sprop->nrefs != 1) {
PROPERTY_CACHE_FILL(cx, &rt->propertyCache, obj, id,
PROP_NOT_FOUND(obj, id));
}
#if JS_HAS_OBJ_WATCHPOINT
if (SPROP_SETTER_SCOPE(sprop, scope) == js_watch_set) {
/*
* Keep the symbol around with null value in case of re-set.
* The watchpoint will hold the "deleted" property until it
* is removed by obj_unwatch or a native JS_ClearWatchPoint.
* See js_SetProperty for the re-set logic.
*/
for (sym = sprop->symbols; sym; sym = sym->next) {
if (sym_id(sym) == id) {
sym->entry.value = NULL;
sprop = js_DropScopeProperty(cx, scope, sprop);
JS_ASSERT(sprop);
goto out;
}
}
}
#endif /* JS_HAS_OBJ_WATCHPOINT */
scope->ops->remove(cx, scope, id);
out:
OBJ_DROP_PROPERTY(cx, obj, prop);
return JS_TRUE;
#else /* !JS_HAS_PROP_DELETE */
jsval null = JSVAL_NULL;
*rval = JSVAL_VOID;
return js_SetProperty(cx, obj, id, &null);
#endif /* !JS_HAS_PROP_DELETE */
}
JSBool
js_DefaultValue(JSContext *cx, JSObject *obj, JSType hint, jsval *vp)
{
jsval v;
JSString *str;
v = OBJECT_TO_JSVAL(obj);
switch (hint) {
case JSTYPE_STRING:
/*
* Propagate the exception if js_TryMethod finds an appropriate
* method, and calling that method returned failure.
*/
if (!js_TryMethod(cx, obj, cx->runtime->atomState.toStringAtom, 0, NULL,
&v))
return JS_FALSE;
if (!JSVAL_IS_PRIMITIVE(v)) {
if (!OBJ_GET_CLASS(cx, obj)->convert(cx, obj, hint, &v))
return JS_FALSE;
/*
* JS1.2 never failed (except for malloc failure) to convert an
* object to a string. ECMA requires an error if both toString
* and valueOf fail to produce a primitive value.
*/
if (!JSVAL_IS_PRIMITIVE(v) && cx->version == JSVERSION_1_2) {
char *bytes = JS_smprintf("[object %s]",
OBJ_GET_CLASS(cx, obj)->name);
if (!bytes)
return JS_FALSE;
str = JS_NewString(cx, bytes, strlen(bytes));
if (!str) {
free(bytes);
return JS_FALSE;
}
v = STRING_TO_JSVAL(str);
goto out;
}
}
break;
default:
if (!OBJ_GET_CLASS(cx, obj)->convert(cx, obj, hint, &v))
return JS_FALSE;
if (!JSVAL_IS_PRIMITIVE(v)) {
JSType type = JS_TypeOfValue(cx, v);
if (type == hint ||
(type == JSTYPE_FUNCTION && hint == JSTYPE_OBJECT)) {
goto out;
}
/* Don't convert to string (source object literal) for JS1.2. */
if (cx->version == JSVERSION_1_2 && hint == JSTYPE_BOOLEAN)
goto out;
if (!js_TryMethod(cx, obj, cx->runtime->atomState.toStringAtom, 0,
NULL, &v))
return JS_FALSE;
}
break;
}
if (!JSVAL_IS_PRIMITIVE(v)) {
/* Avoid recursive death through js_DecompileValueGenerator. */
if (hint == JSTYPE_STRING) {
str = JS_InternString(cx, OBJ_GET_CLASS(cx, obj)->name);
if (!str)
return JS_FALSE;
} else {
str = NULL;
}
*vp = OBJECT_TO_JSVAL(obj);
str = js_DecompileValueGenerator(cx, JS_TRUE, v, str);
if (str) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_CANT_CONVERT_TO,
JS_GetStringBytes(str),
(hint == JSTYPE_VOID)
? "primitive type"
: js_type_str[hint]);
}
return JS_FALSE;
}
out:
*vp = v;
return JS_TRUE;
}
extern JSIdArray *
js_NewIdArray(JSContext *cx, jsint length)
{
JSIdArray *ida;
ida = JS_malloc(cx, sizeof(JSIdArray) + (length - 1) * sizeof(jsval));
if (ida)
ida->length = length;
return ida;
}
extern JSIdArray *
js_GrowIdArray(JSContext *cx, JSIdArray *ida, jsint length)
{
ida = JS_realloc(cx, ida, sizeof(JSIdArray) + (length - 1) * sizeof(jsval));
if (ida)
ida->length = length;
return ida;
}
/* Private type used to iterate over all properties of a native JS object */
typedef struct JSNativeIteratorState {
jsint next_index; /* index into jsid array */
JSIdArray *ida; /* All property ids in enumeration */
} JSNativeIteratorState;
/*
* This function is used to enumerate the properties of native JSObjects
* and those host objects that do not define a JSNewEnumerateOp-style iterator
* function.
*/
JSBool
js_Enumerate(JSContext *cx, JSObject *obj, JSIterateOp enum_op,
jsval *statep, jsid *idp)
{
JSObject *proto_obj;
JSClass *clasp;
JSEnumerateOp enumerate;
JSScopeProperty *sprop;
jsint i, length;
JSScope *scope;
JSIdArray *ida;
JSNativeIteratorState *state;
clasp = OBJ_GET_CLASS(cx, obj);
enumerate = clasp->enumerate;
if (clasp->flags & JSCLASS_NEW_ENUMERATE)
return ((JSNewEnumerateOp) enumerate)(cx, obj, enum_op, statep, idp);
switch (enum_op) {
case JSENUMERATE_INIT:
if (!enumerate(cx, obj))
goto init_error;
length = 0;
/*
* The set of all property ids is pre-computed when the iterator
* is initialized so as to avoid problems with properties being
* deleted during the iteration.
*/
JS_LOCK_OBJ(cx, obj);
scope = OBJ_SCOPE(obj);
/*
* If this object shares a scope with its prototype, don't enumerate
* its properties. Otherwise they will be enumerated a second time
* when the prototype object is enumerated.
*/
proto_obj = OBJ_GET_PROTO(cx, obj);
if (proto_obj && scope == OBJ_SCOPE(proto_obj)) {
ida = js_NewIdArray(cx, 0);
if (!ida) {
JS_UNLOCK_OBJ(cx, obj);
goto init_error;
}
} else {
/* Object has a private scope; Enumerate all props in scope. */
for (sprop = scope->props; sprop; sprop = sprop->next) {
if ((sprop->attrs & JSPROP_ENUMERATE) && sprop->symbols)
length++;
}
ida = js_NewIdArray(cx, length);
if (!ida) {
JS_UNLOCK_OBJ(cx, obj);
goto init_error;
}
i = 0;
for (sprop = scope->props; sprop; sprop = sprop->next) {
if ((sprop->attrs & JSPROP_ENUMERATE) && sprop->symbols) {
JS_ASSERT(i < length);
ida->vector[i++] = sym_id(sprop->symbols);
}
}
}
JS_UNLOCK_OBJ(cx, obj);
state = JS_malloc(cx, sizeof(JSNativeIteratorState));
if (!state) {
JS_DestroyIdArray(cx, ida);
goto init_error;
}
state->ida = ida;
state->next_index = 0;
*statep = PRIVATE_TO_JSVAL(state);
if (idp)
*idp = INT_TO_JSVAL(length);
return JS_TRUE;
case JSENUMERATE_NEXT:
state = JSVAL_TO_PRIVATE(*statep);
ida = state->ida;
length = ida->length;
if (state->next_index != length) {
*idp = ida->vector[state->next_index++];
return JS_TRUE;
}
/* Fall through ... */
case JSENUMERATE_DESTROY:
state = JSVAL_TO_PRIVATE(*statep);
JS_DestroyIdArray(cx, state->ida);
JS_free(cx, state);
*statep = JSVAL_NULL;
return JS_TRUE;
default:
JS_ASSERT(0);
return JS_FALSE;
}
init_error:
*statep = JSVAL_NULL;
return JS_FALSE;
}
JSBool
js_CheckAccess(JSContext *cx, JSObject *obj, jsid id, JSAccessMode mode,
jsval *vp, uintN *attrsp)
{
JSObject *pobj;
JSProperty *prop;
JSScopeProperty *sprop;
JSClass *clasp;
JSBool ok;
if (!js_LookupProperty(cx, obj, id, &pobj, &prop))
return JS_FALSE;
if (!prop) {
*vp = JSVAL_VOID;
*attrsp = 0;
return JS_TRUE;
}
if (!OBJ_IS_NATIVE(pobj)) {
OBJ_DROP_PROPERTY(cx, pobj, prop);
return OBJ_CHECK_ACCESS(cx, pobj, id, mode, vp, attrsp);
}
sprop = (JSScopeProperty *)prop;
*vp = LOCKED_OBJ_GET_SLOT(pobj, sprop->slot);
*attrsp = sprop->attrs;
clasp = LOCKED_OBJ_GET_CLASS(obj);
if (clasp->checkAccess) {
JS_UNLOCK_OBJ(cx, pobj);
ok = clasp->checkAccess(cx, obj, sprop->id, mode, vp);
JS_LOCK_OBJ(cx, pobj);
} else {
ok = JS_TRUE;
}
OBJ_DROP_PROPERTY(cx, pobj, prop);
return ok;
}
JSBool
js_Call(JSContext *cx, JSObject *obj, uintN argc, jsval *argv, jsval *rval)
{
JSClass *clasp;
clasp = OBJ_GET_CLASS(cx, JSVAL_TO_OBJECT(argv[-2]));
if (!clasp->call) {
js_ReportIsNotFunction(cx, &argv[-2], JS_FALSE);
return JS_FALSE;
}
return clasp->call(cx, obj, argc, argv, rval);
}
JSBool
js_Construct(JSContext *cx, JSObject *obj, uintN argc, jsval *argv,
jsval *rval)
{
JSClass *clasp;
clasp = OBJ_GET_CLASS(cx, JSVAL_TO_OBJECT(argv[-2]));
if (!clasp->construct) {
js_ReportIsNotFunction(cx, &argv[-2], JS_TRUE);
return JS_FALSE;
}
return clasp->construct(cx, obj, argc, argv, rval);
}
JSBool
js_HasInstance(JSContext *cx, JSObject *obj, jsval v, JSBool *bp)
{
JSClass *clasp;
clasp = OBJ_GET_CLASS(cx, obj);
if (clasp->hasInstance)
return clasp->hasInstance(cx, obj, v, bp);
*bp = JS_FALSE;
return JS_TRUE;
}
JSBool
js_IsDelegate(JSContext *cx, JSObject *obj, jsval v, JSBool *bp)
{
JSObject *obj2;
*bp = JS_FALSE;
if (JSVAL_IS_PRIMITIVE(v))
return JS_TRUE;
obj2 = JSVAL_TO_OBJECT(v);
while ((obj2 = OBJ_GET_PROTO(cx, obj2)) != NULL) {
if (obj2 == obj) {
*bp = JS_TRUE;
break;
}
}
return JS_TRUE;
}
#ifdef JS_THREADSAFE
void
js_DropProperty(JSContext *cx, JSObject *obj, JSProperty *prop)
{
js_DropScopeProperty(cx, OBJ_SCOPE(obj), (JSScopeProperty *)prop);
JS_UNLOCK_OBJ(cx, obj);
}
#endif
JSBool
js_GetClassPrototype(JSContext *cx, const char *name, JSObject **protop)
{
jsval v;
JSObject *ctor;
if (!FindConstructor(cx, name, &v))
return JS_FALSE;
if (JSVAL_IS_FUNCTION(cx, v)) {
ctor = JSVAL_TO_OBJECT(v);
if (!OBJ_GET_PROPERTY(cx, ctor,
(jsid)cx->runtime->atomState.classPrototypeAtom,
&v)) {
return JS_FALSE;
}
}
*protop = JSVAL_IS_OBJECT(v) ? JSVAL_TO_OBJECT(v) : NULL;
return JS_TRUE;
}
JSBool
js_SetClassPrototype(JSContext *cx, JSObject *ctor, JSObject *proto,
uintN attrs)
{
/*
* Use the given attributes for the prototype property of the constructor,
* as user-defined constructors have a DontEnum prototype (it can be reset
* or even deleted), while native "system" constructors require DontEnum |
* ReadOnly | DontDelete.
*/
if (!OBJ_DEFINE_PROPERTY(cx, ctor,
(jsid)cx->runtime->atomState.classPrototypeAtom,
OBJECT_TO_JSVAL(proto), NULL, NULL,
attrs, NULL)) {
return JS_FALSE;
}
/*
* ECMA says that Object.prototype.constructor, or f.prototype.constructor
* for a user-defined function f, is DontEnum.
*/
return OBJ_DEFINE_PROPERTY(cx, proto,
(jsid)cx->runtime->atomState.constructorAtom,
OBJECT_TO_JSVAL(ctor), NULL, NULL,
0, NULL);
}
JSBool
js_ValueToObject(JSContext *cx, jsval v, JSObject **objp)
{
JSObject *obj;
if (JSVAL_IS_NULL(v) || JSVAL_IS_VOID(v)) {
obj = NULL;
} else if (JSVAL_IS_OBJECT(v)) {
obj = JSVAL_TO_OBJECT(v);
if (!OBJ_DEFAULT_VALUE(cx, obj, JSTYPE_OBJECT, &v))
return JS_FALSE;
if (JSVAL_IS_OBJECT(v))
obj = JSVAL_TO_OBJECT(v);
} else {
if (JSVAL_IS_STRING(v)) {
obj = js_StringToObject(cx, JSVAL_TO_STRING(v));
} else if (JSVAL_IS_INT(v)) {
obj = js_NumberToObject(cx, (jsdouble)JSVAL_TO_INT(v));
} else if (JSVAL_IS_DOUBLE(v)) {
obj = js_NumberToObject(cx, *JSVAL_TO_DOUBLE(v));
} else {
JS_ASSERT(JSVAL_IS_BOOLEAN(v));
obj = js_BooleanToObject(cx, JSVAL_TO_BOOLEAN(v));
}
if (!obj)
return JS_FALSE;
}
*objp = obj;
return JS_TRUE;
}
JSObject *
js_ValueToNonNullObject(JSContext *cx, jsval v)
{
JSObject *obj;
JSString *str;
if (!js_ValueToObject(cx, v, &obj))
return NULL;
if (!obj) {
str = js_DecompileValueGenerator(cx, JS_TRUE, v, NULL);
if (str) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_NO_PROPERTIES, JS_GetStringBytes(str));
}
}
return obj;
}
JSBool
js_TryValueOf(JSContext *cx, JSObject *obj, JSType type, jsval *rval)
{
#if JS_HAS_VALUEOF_HINT
jsval argv[1];
argv[0] = ATOM_KEY(cx->runtime->atomState.typeAtoms[type]);
return js_TryMethod(cx, obj, cx->runtime->atomState.valueOfAtom, 1, argv,
rval);
#else
return js_TryMethod(cx, obj, cx->runtime->atomState.valueOfAtom, 0, NULL,
rval);
#endif
}
JSBool
js_TryMethod(JSContext *cx, JSObject *obj, JSAtom *atom,
uintN argc, jsval *argv, jsval *rval)
{
JSErrorReporter older;
jsval fval;
JSBool ok;
/*
* Report failure only if an appropriate method was found, and calling it
* returned failure. We propagate failure in this case to make exceptions
* behave properly.
*/
older = JS_SetErrorReporter(cx, NULL);
if (OBJ_GET_PROPERTY(cx, obj, (jsid)atom, &fval) &&
!JSVAL_IS_PRIMITIVE(fval)) {
ok = js_InternalCall(cx, obj, fval, argc, argv, rval);
} else {
ok = JS_TRUE;
}
JS_SetErrorReporter(cx, older);
return ok;
}
#if JS_HAS_XDR
#include "jsxdrapi.h"
JSBool
js_XDRObject(JSXDRState *xdr, JSObject **objp)
{
JSContext *cx;
JSClass *clasp;
char *className;
uint32 classId, classDef;
JSBool ok;
JSObject *proto;
cx = xdr->cx;
if (xdr->mode == JSXDR_ENCODE) {
clasp = OBJ_GET_CLASS(cx, *objp);
className = clasp->name;
classId = JS_FindClassIdByName(xdr, className);
classDef = !classId;
if (classDef && !JS_RegisterClass(xdr, clasp, &classId))
return JS_FALSE;
} else {
classDef = 0;
className = NULL;
clasp = NULL; /* quell GCC overwarning */
}
/* XDR a flag word followed (if true) by the class name. */
if (!JS_XDRUint32(xdr, &classDef))
return JS_FALSE;
if (classDef && !JS_XDRCString(xdr, &className))
return JS_FALSE;
/* From here on, return through out: to free className if it was set. */
ok = JS_XDRUint32(xdr, &classId);
if (!ok)
goto out;
if (xdr->mode != JSXDR_ENCODE) {
if (classDef) {
ok = js_GetClassPrototype(cx, className, &proto);
if (!ok)
goto out;
clasp = OBJ_GET_CLASS(cx, proto);
ok = JS_RegisterClass(xdr, clasp, &classId);
if (!ok)
goto out;
} else {
clasp = JS_FindClassById(xdr, classId);
if (!clasp) {
char numBuf[12];
JS_snprintf(numBuf, sizeof numBuf, "%ld", (long)classId);
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_CANT_FIND_CLASS, numBuf);
ok = JS_FALSE;
goto out;
}
}
}
if (!clasp->xdrObject) {
JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL,
JSMSG_CANT_XDR_CLASS, clasp->name);
ok = JS_FALSE;
} else {
ok = clasp->xdrObject(xdr, objp);
}
out:
if (xdr->mode != JSXDR_ENCODE && className)
JS_free(cx, className);
return ok;
}
#endif /* JS_HAS_XDR */
#ifdef DEBUG
/* Routines to print out values during debugging. */
void printChar(jschar *cp) {
fprintf(stderr, "jschar* (0x%p) \"", cp);
while (*cp)
fputc(*cp++, stderr);
fputc('"', stderr);
fputc('\n', stderr);
}
void printString(JSString *str) {
jsuint i;
fprintf(stderr, "string (0x%p) \"", str);
for (i=0; i < str->length; i++)
fputc(str->chars[i], stderr);
fputc('"', stderr);
fputc('\n', stderr);
}
void printVal(JSContext *cx, jsval val);
void printObj(JSContext *cx, JSObject *jsobj) {
jsuint i;
jsval val;
JSClass *clasp;
fprintf(stderr, "object 0x%p\n", jsobj);
clasp = OBJ_GET_CLASS(cx, jsobj);
fprintf(stderr, "class 0x%p %s\n", clasp, clasp->name);
for (i=0; i < jsobj->map->nslots; i++) {
fprintf(stderr, "slot %3d ", i);
val = jsobj->slots[i];
if (JSVAL_IS_OBJECT(val))
fprintf(stderr, "object 0x%p\n", JSVAL_TO_OBJECT(val));
else
printVal(cx, val);
}
}
void printVal(JSContext *cx, jsval val) {
fprintf(stderr, "val %d (0x%p) = ", (int)val, (void *)val);
if (JSVAL_IS_NULL(val)) {
fprintf(stderr, "null\n");
} else if (JSVAL_IS_VOID(val)) {
fprintf(stderr, "undefined\n");
} else if (JSVAL_IS_OBJECT(val)) {
printObj(cx, JSVAL_TO_OBJECT(val));
} else if (JSVAL_IS_INT(val)) {
fprintf(stderr, "(int) %d\n", JSVAL_TO_INT(val));
} else if (JSVAL_IS_STRING(val)) {
printString(JSVAL_TO_STRING(val));
} else if (JSVAL_IS_DOUBLE(val)) {
fprintf(stderr, "(double) %g\n", *JSVAL_TO_DOUBLE(val));
} else {
JS_ASSERT(JSVAL_IS_BOOLEAN(val));
fprintf(stderr, "(boolean) %s\n",
JSVAL_TO_BOOLEAN(val) ? "true" : "false");
}
fflush(stderr);
}
void printId(JSContext *cx, jsid id) {
fprintf(stderr, "id %d (0x%p) is ", (int)id, (void *)id);
printVal(cx, js_IdToValue(id));
}
void printAtom(JSAtom *atom) {
printString(ATOM_TO_STRING(atom));
}
#endif
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