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gecko/js/src/jsatom.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* ***** 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 ***** */
/*
* JS atom table.
*/
#include <stdlib.h>
#include <string.h>
#include "mozilla/RangedPtr.h"
#include "mozilla/Util.h"
#include "jstypes.h"
#include "jsstdint.h"
#include "jsutil.h"
#include "jshash.h"
#include "jsprf.h"
#include "jsapi.h"
#include "jsatom.h"
#include "jscntxt.h"
#include "jsgc.h"
#include "jsgcmark.h"
#include "jslock.h"
#include "jsnum.h"
#include "jsstr.h"
#include "jsversion.h"
#include "jsxml.h"
#include "frontend/Parser.h"
#include "jsstrinlines.h"
#include "jsatominlines.h"
#include "jsobjinlines.h"
#include "vm/String-inl.h"
using namespace mozilla;
using namespace js;
using namespace js::gc;
const size_t JSAtomState::commonAtomsOffset = offsetof(JSAtomState, emptyAtom);
const size_t JSAtomState::lazyAtomsOffset = offsetof(JSAtomState, lazy);
/*
* ATOM_HASH assumes that JSHashNumber is 32-bit even on 64-bit systems.
*/
JS_STATIC_ASSERT(sizeof(JSHashNumber) == 4);
JS_STATIC_ASSERT(sizeof(JSAtom *) == JS_BYTES_PER_WORD);
const char *
js_AtomToPrintableString(JSContext *cx, JSAtom *atom, JSAutoByteString *bytes)
{
return js_ValueToPrintable(cx, StringValue(atom), bytes);
}
#define JS_PROTO(name,code,init) const char js_##name##_str[] = #name;
#include "jsproto.tbl"
#undef JS_PROTO
/*
* String constants for common atoms defined in JSAtomState starting from
* JSAtomState.emptyAtom until JSAtomState.lazy.
*
* The elements of the array after the first empty string define strings
* corresponding to the two boolean literals, false and true, followed by the
* JSType enumerators from jspubtd.h starting with "undefined" for JSTYPE_VOID
* (which is special-value 2) and continuing as initialized below. The static
* asserts check these relations.
*/
JS_STATIC_ASSERT(JSTYPE_LIMIT == 8);
JS_STATIC_ASSERT(JSTYPE_VOID == 0);
const char *const js_common_atom_names[] = {
"", /* emptyAtom */
js_false_str, /* booleanAtoms[0] */
js_true_str, /* booleanAtoms[1] */
js_undefined_str, /* typeAtoms[JSTYPE_VOID] */
js_object_str, /* typeAtoms[JSTYPE_OBJECT] */
js_function_str, /* typeAtoms[JSTYPE_FUNCTION] */
"string", /* typeAtoms[JSTYPE_STRING] */
"number", /* typeAtoms[JSTYPE_NUMBER] */
"boolean", /* typeAtoms[JSTYPE_BOOLEAN] */
js_null_str, /* typeAtoms[JSTYPE_NULL] */
"xml", /* typeAtoms[JSTYPE_XML] */
js_null_str, /* nullAtom */
#define JS_PROTO(name,code,init) js_##name##_str,
#include "jsproto.tbl"
#undef JS_PROTO
js_anonymous_str, /* anonymousAtom */
js_apply_str, /* applyAtom */
js_arguments_str, /* argumentsAtom */
js_arity_str, /* arityAtom */
js_BYTES_PER_ELEMENT_str, /* BYTES_PER_ELEMENTAtom */
js_call_str, /* callAtom */
js_callee_str, /* calleeAtom */
js_caller_str, /* callerAtom */
js_class_prototype_str, /* classPrototypeAtom */
js_constructor_str, /* constructorAtom */
js_each_str, /* eachAtom */
js_eval_str, /* evalAtom */
js_fileName_str, /* fileNameAtom */
js_get_str, /* getAtom */
js_global_str, /* globalAtom */
js_ignoreCase_str, /* ignoreCaseAtom */
js_index_str, /* indexAtom */
js_input_str, /* inputAtom */
"toISOString", /* toISOStringAtom */
js_iterator_str, /* iteratorAtom */
js_join_str, /* joinAtom */
js_lastIndex_str, /* lastIndexAtom */
js_length_str, /* lengthAtom */
js_lineNumber_str, /* lineNumberAtom */
js_message_str, /* messageAtom */
js_multiline_str, /* multilineAtom */
js_name_str, /* nameAtom */
js_next_str, /* nextAtom */
js_noSuchMethod_str, /* noSuchMethodAtom */
"[object Null]", /* objectNullAtom */
"[object Undefined]", /* objectUndefinedAtom */
js_proto_str, /* protoAtom */
js_set_str, /* setAtom */
js_source_str, /* sourceAtom */
js_stack_str, /* stackAtom */
js_sticky_str, /* stickyAtom */
js_toGMTString_str, /* toGMTStringAtom */
js_toLocaleString_str, /* toLocaleStringAtom */
js_toSource_str, /* toSourceAtom */
js_toString_str, /* toStringAtom */
js_toUTCString_str, /* toUTCStringAtom */
js_valueOf_str, /* valueOfAtom */
js_toJSON_str, /* toJSONAtom */
"(void 0)", /* void0Atom */
js_enumerable_str, /* enumerableAtom */
js_configurable_str, /* configurableAtom */
js_writable_str, /* writableAtom */
js_value_str, /* valueAtom */
js_test_str, /* testAtom */
"use strict", /* useStrictAtom */
"loc", /* locAtom */
"line", /* lineAtom */
"Infinity", /* InfinityAtom */
"NaN", /* NaNAtom */
"builder", /* builderAtom */
#if JS_HAS_XML_SUPPORT
js_etago_str, /* etagoAtom */
js_namespace_str, /* namespaceAtom */
js_ptagc_str, /* ptagcAtom */
js_qualifier_str, /* qualifierAtom */
js_space_str, /* spaceAtom */
js_stago_str, /* stagoAtom */
js_star_str, /* starAtom */
js_starQualifier_str, /* starQualifierAtom */
js_tagc_str, /* tagcAtom */
js_xml_str, /* xmlAtom */
"@mozilla.org/js/function", /* functionNamespaceURIAtom */
#endif
"Proxy", /* ProxyAtom */
"getOwnPropertyDescriptor", /* getOwnPropertyDescriptorAtom */
"getPropertyDescriptor", /* getPropertyDescriptorAtom */
"defineProperty", /* definePropertyAtom */
"delete", /* deleteAtom */
"getOwnPropertyNames", /* getOwnPropertyNames */
"enumerate", /* enumerateAtom */
"fix", /* fixAtom */
"has", /* hasAtom */
"hasOwn", /* hasOwnAtom */
"keys", /* keysAtom */
"iterate", /* iterateAtom */
"WeakMap", /* WeakMapAtom */
"byteLength", /* byteLengthAtom */
"return", /* returnAtom */
"throw" /* throwAtom */
};
void
JSAtomState::checkStaticInvariants()
{
/*
* Start and limit offsets for atom pointers in JSAtomState must be aligned
* on the word boundary.
*/
JS_STATIC_ASSERT(commonAtomsOffset % sizeof(JSAtom *) == 0);
JS_STATIC_ASSERT(sizeof(*this) % sizeof(JSAtom *) == 0);
/*
* JS_BOOLEAN_STR and JS_TYPE_STR assume that boolean names starts from the
* index 1 and type name starts from the index 1+2 atoms in JSAtomState.
*/
JS_STATIC_ASSERT(1 * sizeof(JSAtom *) ==
offsetof(JSAtomState, booleanAtoms) - commonAtomsOffset);
JS_STATIC_ASSERT((1 + 2) * sizeof(JSAtom *) ==
offsetof(JSAtomState, typeAtoms) - commonAtomsOffset);
JS_STATIC_ASSERT(JS_ARRAY_LENGTH(js_common_atom_names) * sizeof(JSAtom *) ==
lazyAtomsOffset - commonAtomsOffset);
}
/*
* Interpreter macros called by the trace recorder assume common atom indexes
* fit in one byte of immediate operand.
*/
JS_STATIC_ASSERT(JS_ARRAY_LENGTH(js_common_atom_names) < 256);
const size_t js_common_atom_count = JS_ARRAY_LENGTH(js_common_atom_names);
const char js_anonymous_str[] = "anonymous";
const char js_apply_str[] = "apply";
const char js_arguments_str[] = "arguments";
const char js_arity_str[] = "arity";
const char js_BYTES_PER_ELEMENT_str[] = "BYTES_PER_ELEMENT";
const char js_call_str[] = "call";
const char js_callee_str[] = "callee";
const char js_caller_str[] = "caller";
const char js_class_prototype_str[] = "prototype";
const char js_constructor_str[] = "constructor";
const char js_each_str[] = "each";
const char js_eval_str[] = "eval";
const char js_fileName_str[] = "fileName";
const char js_get_str[] = "get";
const char js_getter_str[] = "getter";
const char js_global_str[] = "global";
const char js_ignoreCase_str[] = "ignoreCase";
const char js_index_str[] = "index";
const char js_input_str[] = "input";
const char js_iterator_str[] = "__iterator__";
const char js_join_str[] = "join";
const char js_lastIndex_str[] = "lastIndex";
const char js_length_str[] = "length";
const char js_lineNumber_str[] = "lineNumber";
const char js_message_str[] = "message";
const char js_multiline_str[] = "multiline";
const char js_name_str[] = "name";
const char js_next_str[] = "next";
const char js_noSuchMethod_str[] = "__noSuchMethod__";
const char js_object_str[] = "object";
const char js_proto_str[] = "__proto__";
const char js_setter_str[] = "setter";
const char js_set_str[] = "set";
const char js_source_str[] = "source";
const char js_stack_str[] = "stack";
const char js_sticky_str[] = "sticky";
const char js_toGMTString_str[] = "toGMTString";
const char js_toLocaleString_str[] = "toLocaleString";
const char js_toSource_str[] = "toSource";
const char js_toString_str[] = "toString";
const char js_toUTCString_str[] = "toUTCString";
const char js_undefined_str[] = "undefined";
const char js_valueOf_str[] = "valueOf";
const char js_toJSON_str[] = "toJSON";
const char js_enumerable_str[] = "enumerable";
const char js_configurable_str[] = "configurable";
const char js_writable_str[] = "writable";
const char js_value_str[] = "value";
const char js_test_str[] = "test";
#if JS_HAS_XML_SUPPORT
const char js_etago_str[] = "</";
const char js_namespace_str[] = "namespace";
const char js_ptagc_str[] = "/>";
const char js_qualifier_str[] = "::";
const char js_space_str[] = " ";
const char js_stago_str[] = "<";
const char js_star_str[] = "*";
const char js_starQualifier_str[] = "*::";
const char js_tagc_str[] = ">";
const char js_xml_str[] = "xml";
#endif
#if JS_HAS_GENERATORS
const char js_close_str[] = "close";
const char js_send_str[] = "send";
#endif
/*
* For a browser build from 2007-08-09 after the browser starts up there are
* just 55 double atoms, but over 15000 string atoms. Not to penalize more
* economical embeddings allocating too much memory initially we initialize
* atomized strings with just 1K entries.
*/
#define JS_STRING_HASH_COUNT 1024
JSBool
js_InitAtomState(JSRuntime *rt)
{
JSAtomState *state = &rt->atomState;
JS_ASSERT(!state->atoms.initialized());
if (!state->atoms.init(JS_STRING_HASH_COUNT))
return false;
#ifdef JS_THREADSAFE
js_InitLock(&state->lock);
#endif
JS_ASSERT(state->atoms.initialized());
return JS_TRUE;
}
void
js_FinishAtomState(JSRuntime *rt)
{
JSAtomState *state = &rt->atomState;
if (!state->atoms.initialized()) {
/*
* We are called with uninitialized state when JS_NewRuntime fails and
* calls JS_DestroyRuntime on a partially initialized runtime.
*/
return;
}
for (AtomSet::Range r = state->atoms.all(); !r.empty(); r.popFront())
r.front().asPtr()->finalize(rt);
#ifdef JS_THREADSAFE
js_FinishLock(&state->lock);
#endif
}
bool
js_InitCommonAtoms(JSContext *cx)
{
JSAtomState *state = &cx->runtime->atomState;
JSAtom **atoms = state->commonAtomsStart();
for (size_t i = 0; i < ArrayLength(js_common_atom_names); i++, atoms++) {
JSAtom *atom = js_Atomize(cx, js_common_atom_names[i], strlen(js_common_atom_names[i]),
InternAtom);
if (!atom)
return false;
*atoms = atom->asPropertyName();
}
state->clearLazyAtoms();
cx->runtime->emptyString = state->emptyAtom;
return true;
}
void
js_FinishCommonAtoms(JSContext *cx)
{
cx->runtime->emptyString = NULL;
cx->runtime->atomState.junkAtoms();
}
void
js_TraceAtomState(JSTracer *trc)
{
JSRuntime *rt = trc->runtime;
JSAtomState *state = &rt->atomState;
#ifdef DEBUG
size_t number = 0;
#endif
if (rt->gcKeepAtoms) {
for (AtomSet::Range r = state->atoms.all(); !r.empty(); r.popFront()) {
JS_SET_TRACING_INDEX(trc, "locked_atom", number++);
MarkAtom(trc, r.front().asPtr());
}
} else {
for (AtomSet::Range r = state->atoms.all(); !r.empty(); r.popFront()) {
AtomStateEntry entry = r.front();
if (!entry.isTagged())
continue;
JS_SET_TRACING_INDEX(trc, "interned_atom", number++);
MarkAtom(trc, entry.asPtr());
}
}
}
void
js_SweepAtomState(JSContext *cx)
{
JSAtomState *state = &cx->runtime->atomState;
for (AtomSet::Enum e(state->atoms); !e.empty(); e.popFront()) {
AtomStateEntry entry = e.front();
if (entry.isTagged()) {
/* Pinned or interned key cannot be finalized. */
JS_ASSERT(!IsAboutToBeFinalized(cx, entry.asPtr()));
continue;
}
if (IsAboutToBeFinalized(cx, entry.asPtr()))
e.removeFront();
}
}
bool
AtomIsInterned(JSContext *cx, JSAtom *atom)
{
/* We treat static strings as interned because they're never collected. */
if (StaticStrings::isStatic(atom))
return true;
AutoLockAtomsCompartment lock(cx);
AtomSet::Ptr p = cx->runtime->atomState.atoms.lookup(atom);
if (!p)
return false;
return p->isTagged();
}
enum OwnCharsBehavior
{
CopyChars, /* in other words, do not take ownership */
TakeCharOwnership
};
/*
* Callers passing OwnChars have freshly allocated *pchars and thus this
* memory can be used as a new JSAtom's buffer without copying. When this flag
* is set, the contract is that callers will free *pchars iff *pchars == NULL.
*/
JS_ALWAYS_INLINE
static JSAtom *
AtomizeInline(JSContext *cx, const jschar **pchars, size_t length,
InternBehavior ib, OwnCharsBehavior ocb = CopyChars)
{
const jschar *chars = *pchars;
if (JSAtom *s = cx->runtime->staticStrings.lookup(chars, length))
return s;
AutoLockAtomsCompartment lock(cx);
AtomSet &atoms = cx->runtime->atomState.atoms;
AtomSet::AddPtr p = atoms.lookupForAdd(AtomHasher::Lookup(chars, length));
if (p) {
JSAtom *atom = p->asPtr();
p->setTagged(bool(ib));
return atom;
}
SwitchToCompartment sc(cx, cx->runtime->atomsCompartment);
JSFixedString *key;
if (ocb == TakeCharOwnership) {
key = js_NewString(cx, const_cast<jschar *>(chars), length);
if (!key)
return NULL;
*pchars = NULL; /* Called should not free *pchars. */
} else {
JS_ASSERT(ocb == CopyChars);
key = js_NewStringCopyN(cx, chars, length);
if (!key)
return NULL;
}
/*
* We have to relookup the key as the last ditch GC invoked from the
* string allocation or OOM handling unlocks the atomsCompartment.
*
* N.B. this avoids recomputing the hash but still has a potential
* (# collisions * # chars) comparison cost in the case of a hash
* collision!
*/
AtomHasher::Lookup lookup(chars, length);
if (!atoms.relookupOrAdd(p, lookup, AtomStateEntry((JSAtom *) key, bool(ib)))) {
JS_ReportOutOfMemory(cx); /* SystemAllocPolicy does not report */
return NULL;
}
return key->morphAtomizedStringIntoAtom();
}
static JSAtom *
Atomize(JSContext *cx, const jschar **pchars, size_t length,
InternBehavior ib, OwnCharsBehavior ocb = CopyChars)
{
return AtomizeInline(cx, pchars, length, ib, ocb);
}
JSAtom *
js_AtomizeString(JSContext *cx, JSString *str, InternBehavior ib)
{
if (str->isAtom()) {
JSAtom &atom = str->asAtom();
/* N.B. static atoms are effectively always interned. */
if (ib != InternAtom || js::StaticStrings::isStatic(&atom))
return &atom;
/* Here we have to check whether the atom is already interned. */
AutoLockAtomsCompartment lock(cx);
AtomSet &atoms = cx->runtime->atomState.atoms;
AtomSet::Ptr p = atoms.lookup(AtomHasher::Lookup(&atom));
JS_ASSERT(p); /* Non-static atom must exist in atom state set. */
JS_ASSERT(p->asPtr() == &atom);
JS_ASSERT(ib == InternAtom);
p->setTagged(bool(ib));
return &atom;
}
if (str->isAtom())
return &str->asAtom();
size_t length = str->length();
const jschar *chars = str->getChars(cx);
if (!chars)
return NULL;
JS_ASSERT(length <= JSString::MAX_LENGTH);
return Atomize(cx, &chars, length, ib);
}
JSAtom *
js_Atomize(JSContext *cx, const char *bytes, size_t length, InternBehavior ib, FlationCoding fc)
{
CHECK_REQUEST(cx);
if (!JSString::validateLength(cx, length))
return NULL;
/*
* Avoiding the malloc in InflateString on shorter strings saves us
* over 20,000 malloc calls on mozilla browser startup. This compares to
* only 131 calls where the string is longer than a 31 char (net) buffer.
* The vast majority of atomized strings are already in the hashtable. So
* js_AtomizeString rarely has to copy the temp string we make.
*/
static const unsigned ATOMIZE_BUF_MAX = 32;
jschar inflated[ATOMIZE_BUF_MAX];
size_t inflatedLength = ATOMIZE_BUF_MAX - 1;
const jschar *chars;
OwnCharsBehavior ocb = CopyChars;
if (length < ATOMIZE_BUF_MAX) {
if (fc == CESU8Encoding)
InflateUTF8StringToBuffer(cx, bytes, length, inflated, &inflatedLength, fc);
else
InflateStringToBuffer(cx, bytes, length, inflated, &inflatedLength);
inflated[inflatedLength] = 0;
chars = inflated;
} else {
inflatedLength = length;
chars = InflateString(cx, bytes, &inflatedLength, fc);
if (!chars)
return NULL;
ocb = TakeCharOwnership;
}
JSAtom *atom = Atomize(cx, &chars, inflatedLength, ib, ocb);
if (ocb == TakeCharOwnership && chars)
cx->free_((void *)chars);
return atom;
}
JSAtom *
js_AtomizeChars(JSContext *cx, const jschar *chars, size_t length, InternBehavior ib)
{
CHECK_REQUEST(cx);
if (!JSString::validateLength(cx, length))
return NULL;
return AtomizeInline(cx, &chars, length, ib);
}
JSAtom *
js_GetExistingStringAtom(JSContext *cx, const jschar *chars, size_t length)
{
if (JSAtom *atom = cx->runtime->staticStrings.lookup(chars, length))
return atom;
AutoLockAtomsCompartment lock(cx);
AtomSet::Ptr p = cx->runtime->atomState.atoms.lookup(AtomHasher::Lookup(chars, length));
return p ? p->asPtr() : NULL;
}
#ifdef DEBUG
JS_FRIEND_API(void)
js_DumpAtoms(JSContext *cx, FILE *fp)
{
JSAtomState *state = &cx->runtime->atomState;
fprintf(fp, "atoms table contents:\n");
unsigned number = 0;
for (AtomSet::Range r = state->atoms.all(); !r.empty(); r.popFront()) {
AtomStateEntry entry = r.front();
fprintf(fp, "%3u ", number++);
JSAtom *key = entry.asPtr();
FileEscapedString(fp, key, '"');
if (entry.isTagged())
fputs(" interned", fp);
putc('\n', fp);
}
putc('\n', fp);
}
#endif
#if JS_BITS_PER_WORD == 32
# define TEMP_SIZE_START_LOG2 5
#else
# define TEMP_SIZE_START_LOG2 6
#endif
#define TEMP_SIZE_LIMIT_LOG2 (TEMP_SIZE_START_LOG2 + NUM_TEMP_FREELISTS)
#define TEMP_SIZE_START JS_BIT(TEMP_SIZE_START_LOG2)
#define TEMP_SIZE_LIMIT JS_BIT(TEMP_SIZE_LIMIT_LOG2)
JS_STATIC_ASSERT(TEMP_SIZE_START >= sizeof(JSHashTable));
void
js_InitAtomMap(JSContext *cx, AtomIndexMap *indices, JSAtom **atoms)
{
if (indices->isMap()) {
typedef AtomIndexMap::WordMap WordMap;
const WordMap &wm = indices->asMap();
for (WordMap::Range r = wm.all(); !r.empty(); r.popFront()) {
JSAtom *atom = r.front().key;
jsatomid index = r.front().value;
JS_ASSERT(index < indices->count());
atoms[index] = atom;
}
} else {
for (const AtomIndexMap::InlineElem *it = indices->asInline(), *end = indices->inlineEnd();
it != end; ++it) {
JSAtom *atom = it->key;
if (!atom)
continue;
JS_ASSERT(it->value < indices->count());
atoms[it->value] = atom;
}
}
}
namespace js {
bool
IndexToIdSlow(JSContext *cx, uint32_t index, jsid *idp)
{
JS_ASSERT(index > JSID_INT_MAX);
jschar buf[UINT32_CHAR_BUFFER_LENGTH];
RangedPtr<jschar> end(ArrayEnd(buf), buf, ArrayEnd(buf));
RangedPtr<jschar> start = BackfillIndexInCharBuffer(index, end);
JSAtom *atom = js_AtomizeChars(cx, start.get(), end - start);
if (!atom)
return false;
*idp = ATOM_TO_JSID(atom);
JS_ASSERT(js_CheckForStringIndex(*idp) == *idp);
return true;
}
} /* namespace js */
/* JSBOXEDWORD_INT_MAX as a string */
#define JSBOXEDWORD_INT_MAX_STRING "1073741823"
/*
* Convert string indexes that convert to int jsvals as ints to save memory.
* Care must be taken to use this macro every time a property name is used, or
* else double-sets, incorrect property cache misses, or other mistakes could
* occur.
*/
jsid
js_CheckForStringIndex(jsid id)
{
if (!JSID_IS_ATOM(id))
return id;
JSAtom *atom = JSID_TO_ATOM(id);
const jschar *s = atom->chars();
jschar ch = *s;
JSBool negative = (ch == '-');
if (negative)
ch = *++s;
if (!JS7_ISDEC(ch))
return id;
size_t n = atom->length() - negative;
if (n > sizeof(JSBOXEDWORD_INT_MAX_STRING) - 1)
return id;
const jschar *cp = s;
const jschar *end = s + n;
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++;
}
}
/*
* Non-integer indexes can't be represented as integers. Also, distinguish
* index "-0" from "0", because JSBOXEDWORD_INT cannot.
*/
if (cp != end || (negative && index == 0))
return id;
if (negative) {
if (oldIndex < -(JSID_INT_MIN / 10) ||
(oldIndex == -(JSID_INT_MIN / 10) && c <= (-JSID_INT_MIN % 10)))
{
id = INT_TO_JSID(-jsint(index));
}
} else {
if (oldIndex < JSID_INT_MAX / 10 ||
(oldIndex == JSID_INT_MAX / 10 && c <= (JSID_INT_MAX % 10)))
{
id = INT_TO_JSID(jsint(index));
}
}
return id;
}
#if JS_HAS_XML_SUPPORT
bool
js_InternNonIntElementIdSlow(JSContext *cx, JSObject *obj, const Value &idval,
jsid *idp)
{
JS_ASSERT(idval.isObject());
if (obj->isXML()) {
*idp = OBJECT_TO_JSID(&idval.toObject());
return true;
}
if (js_GetLocalNameFromFunctionQName(&idval.toObject(), idp, cx))
return true;
return js_ValueToStringId(cx, idval, idp);
}
bool
js_InternNonIntElementIdSlow(JSContext *cx, JSObject *obj, const Value &idval,
jsid *idp, Value *vp)
{
JS_ASSERT(idval.isObject());
if (obj->isXML()) {
JSObject &idobj = idval.toObject();
*idp = OBJECT_TO_JSID(&idobj);
vp->setObject(idobj);
return true;
}
if (js_GetLocalNameFromFunctionQName(&idval.toObject(), idp, cx)) {
*vp = IdToValue(*idp);
return true;
}
if (js_ValueToStringId(cx, idval, idp)) {
vp->setString(JSID_TO_STRING(*idp));
return true;
}
return false;
}
#endif
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