LCOV - app.info - js/src/jsatom.cpp

LCOV - code coverage report
| Current view: | directory - js/src - jsatom.cpp (source / functions) |  | Found | Hit | Coverage |
| Test: | app.info | Lines: | 238 | 192 | 80.7 %
| Date: | 2012-06-02 | Functions: | 21 | 18 | 85.7 %

           1                 : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
           2                 :  *
           3                 :  * ***** BEGIN LICENSE BLOCK *****
           4                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
           5                 :  *
           6                 :  * The contents of this file are subject to the Mozilla Public License Version
           7                 :  * 1.1 (the "License"); you may not use this file except in compliance with
           8                 :  * the License. You may obtain a copy of the License at
           9                 :  * http://www.mozilla.org/MPL/
          10                 :  *
          11                 :  * Software distributed under the License is distributed on an "AS IS" basis,
          12                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
          13                 :  * for the specific language governing rights and limitations under the
          14                 :  * License.
          15                 :  *
          16                 :  * The Original Code is Mozilla Communicator client code, released
          17                 :  * March 31, 1998.
          18                 :  *
          19                 :  * The Initial Developer of the Original Code is
          20                 :  * Netscape Communications Corporation.
          21                 :  * Portions created by the Initial Developer are Copyright (C) 1998
          22                 :  * the Initial Developer. All Rights Reserved.
          23                 :  *
          24                 :  * Contributor(s):
          25                 :  *
          26                 :  * Alternatively, the contents of this file may be used under the terms of
          27                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
          28                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
          29                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
          30                 :  * of those above. If you wish to allow use of your version of this file only
          31                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
          32                 :  * use your version of this file under the terms of the MPL, indicate your
          33                 :  * decision by deleting the provisions above and replace them with the notice
          34                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
          35                 :  * the provisions above, a recipient may use your version of this file under
          36                 :  * the terms of any one of the MPL, the GPL or the LGPL.
          37                 :  *
          38                 :  * ***** END LICENSE BLOCK ***** */
          39                 :
          40                 : /*
          41                 :  * JS atom table.
          42                 :  */
          43                 : #include <stdlib.h>
          44                 : #include <string.h>
          45                 :
          46                 : #include "mozilla/RangedPtr.h"
          47                 : #include "mozilla/Util.h"
          48                 :
          49                 : #include "jstypes.h"
          50                 : #include "jsutil.h"
          51                 : #include "jshash.h"
          52                 : #include "jsprf.h"
          53                 : #include "jsapi.h"
          54                 : #include "jsatom.h"
          55                 : #include "jscntxt.h"
          56                 : #include "jsgc.h"
          57                 : #include "jsgcmark.h"
          58                 : #include "jslock.h"
          59                 : #include "jsnum.h"
          60                 : #include "jsstr.h"
          61                 : #include "jsversion.h"
          62                 : #include "jsxml.h"
          63                 :
          64                 : #include "frontend/Parser.h"
          65                 :
          66                 : #include "jsstrinlines.h"
          67                 : #include "jsatominlines.h"
          68                 : #include "jsobjinlines.h"
          69                 :
          70                 : #include "vm/String-inl.h"
          71                 :
          72                 : using namespace mozilla;
          73                 : using namespace js;
          74                 : using namespace js::gc;
          75                 :
          76                 : const size_t JSAtomState::commonAtomsOffset = offsetof(JSAtomState, emptyAtom);
          77                 : const size_t JSAtomState::lazyAtomsOffset = offsetof(JSAtomState, lazy);
          78                 :
          79                 : /*
          80                 :  * ATOM_HASH assumes that JSHashNumber is 32-bit even on 64-bit systems.
          81                 :  */
          82                 : JS_STATIC_ASSERT(sizeof(JSHashNumber) == 4);
          83                 : JS_STATIC_ASSERT(sizeof(JSAtom *) == JS_BYTES_PER_WORD);
          84                 :
          85                 : const char *
          86           21994 : js_AtomToPrintableString(JSContext *cx, JSAtom *atom, JSAutoByteString *bytes)
          87                 : {
          88           21994 :     return js_ValueToPrintable(cx, StringValue(atom), bytes);
          89                 : }
          90                 :
          91                 : #define JS_PROTO(name,code,init) const char js_##name##_str[] = #name;
          92                 : #include "jsproto.tbl"
          93                 : #undef JS_PROTO
          94                 :
          95                 : /*
          96                 :  * String constants for common atoms defined in JSAtomState starting from
          97                 :  * JSAtomState.emptyAtom until JSAtomState.lazy.
          98                 :  *
          99                 :  * The elements of the array after the first empty string define strings
         100                 :  * corresponding to the two boolean literals, false and true, followed by the
         101                 :  * JSType enumerators from jspubtd.h starting with "undefined" for JSTYPE_VOID
         102                 :  * (which is special-value 2) and continuing as initialized below. The static
         103                 :  * asserts check these relations.
         104                 :  */
         105                 : JS_STATIC_ASSERT(JSTYPE_LIMIT == 8);
         106                 : JS_STATIC_ASSERT(JSTYPE_VOID == 0);
         107                 :
         108                 : const char *const js_common_atom_names[] = {
         109                 :     "",                         /* emptyAtom                    */
         110                 :     js_false_str,               /* booleanAtoms[0]              */
         111                 :     js_true_str,                /* booleanAtoms[1]              */
         112                 :     js_undefined_str,           /* typeAtoms[JSTYPE_VOID]       */
         113                 :     js_object_str,              /* typeAtoms[JSTYPE_OBJECT]     */
         114                 :     js_function_str,            /* typeAtoms[JSTYPE_FUNCTION]   */
         115                 :     "string",                   /* typeAtoms[JSTYPE_STRING]     */
         116                 :     "number",                   /* typeAtoms[JSTYPE_NUMBER]     */
         117                 :     "boolean",                  /* typeAtoms[JSTYPE_BOOLEAN]    */
         118                 :     js_null_str,                /* typeAtoms[JSTYPE_NULL]       */
         119                 :     "xml",                      /* typeAtoms[JSTYPE_XML]        */
         120                 :     js_null_str,                /* nullAtom                     */
         121                 :
         122                 : #define JS_PROTO(name,code,init) js_##name##_str,
         123                 : #include "jsproto.tbl"
         124                 : #undef JS_PROTO
         125                 :
         126                 :     js_anonymous_str,           /* anonymousAtom                */
         127                 :     js_apply_str,               /* applyAtom                    */
         128                 :     js_arguments_str,           /* argumentsAtom                */
         129                 :     js_arity_str,               /* arityAtom                    */
         130                 :     js_BYTES_PER_ELEMENT_str,   /* BYTES_PER_ELEMENTAtom        */
         131                 :     js_call_str,                /* callAtom                     */
         132                 :     js_callee_str,              /* calleeAtom                   */
         133                 :     js_caller_str,              /* callerAtom                   */
         134                 :     js_class_prototype_str,     /* classPrototypeAtom           */
         135                 :     js_constructor_str,         /* constructorAtom              */
         136                 :     js_each_str,                /* eachAtom                     */
         137                 :     js_eval_str,                /* evalAtom                     */
         138                 :     js_fileName_str,            /* fileNameAtom                 */
         139                 :     js_get_str,                 /* getAtom                      */
         140                 :     js_global_str,              /* globalAtom                   */
         141                 :     js_ignoreCase_str,          /* ignoreCaseAtom               */
         142                 :     js_index_str,               /* indexAtom                    */
         143                 :     js_input_str,               /* inputAtom                    */
         144                 :     "toISOString",              /* toISOStringAtom              */
         145                 :     js_iterator_str,            /* iteratorAtom                 */
         146                 :     js_join_str,                /* joinAtom                     */
         147                 :     js_lastIndex_str,           /* lastIndexAtom                */
         148                 :     js_length_str,              /* lengthAtom                   */
         149                 :     js_lineNumber_str,          /* lineNumberAtom               */
         150                 :     js_message_str,             /* messageAtom                  */
         151                 :     js_multiline_str,           /* multilineAtom                */
         152                 :     js_name_str,                /* nameAtom                     */
         153                 :     js_next_str,                /* nextAtom                     */
         154                 :     js_noSuchMethod_str,        /* noSuchMethodAtom             */
         155                 :     "[object Null]",            /* objectNullAtom               */
         156                 :     "[object Undefined]",       /* objectUndefinedAtom          */
         157                 :     "of",                       /* ofAtom                       */
         158                 :     js_proto_str,               /* protoAtom                    */
         159                 :     js_set_str,                 /* setAtom                      */
         160                 :     js_source_str,              /* sourceAtom                   */
         161                 :     js_stack_str,               /* stackAtom                    */
         162                 :     js_sticky_str,              /* stickyAtom                   */
         163                 :     js_toGMTString_str,         /* toGMTStringAtom              */
         164                 :     js_toLocaleString_str,      /* toLocaleStringAtom           */
         165                 :     js_toSource_str,            /* toSourceAtom                 */
         166                 :     js_toString_str,            /* toStringAtom                 */
         167                 :     js_toUTCString_str,         /* toUTCStringAtom              */
         168                 :     js_valueOf_str,             /* valueOfAtom                  */
         169                 :     js_toJSON_str,              /* toJSONAtom                   */
         170                 :     "(void 0)",                 /* void0Atom                    */
         171                 :     js_enumerable_str,          /* enumerableAtom               */
         172                 :     js_configurable_str,        /* configurableAtom             */
         173                 :     js_writable_str,            /* writableAtom                 */
         174                 :     js_value_str,               /* valueAtom                    */
         175                 :     js_test_str,                /* testAtom                     */
         176                 :     "use strict",               /* useStrictAtom                */
         177                 :     "loc",                      /* locAtom                      */
         178                 :     "line",                     /* lineAtom                     */
         179                 :     "Infinity",                 /* InfinityAtom                 */
         180                 :     "NaN",                      /* NaNAtom                      */
         181                 :     "builder",                  /* builderAtom                  */
         182                 :
         183                 : #if JS_HAS_XML_SUPPORT
         184                 :     js_etago_str,               /* etagoAtom                    */
         185                 :     js_namespace_str,           /* namespaceAtom                */
         186                 :     js_ptagc_str,               /* ptagcAtom                    */
         187                 :     js_qualifier_str,           /* qualifierAtom                */
         188                 :     js_space_str,               /* spaceAtom                    */
         189                 :     js_stago_str,               /* stagoAtom                    */
         190                 :     js_star_str,                /* starAtom                     */
         191                 :     js_starQualifier_str,       /* starQualifierAtom            */
         192                 :     js_tagc_str,                /* tagcAtom                     */
         193                 :     js_xml_str,                 /* xmlAtom                      */
         194                 :     "@mozilla.org/js/function", /* functionNamespaceURIAtom     */
         195                 : #endif
         196                 :
         197                 :     "Proxy",                    /* ProxyAtom                    */
         198                 :
         199                 :     "getOwnPropertyDescriptor", /* getOwnPropertyDescriptorAtom */
         200                 :     "getPropertyDescriptor",    /* getPropertyDescriptorAtom    */
         201                 :     "defineProperty",           /* definePropertyAtom           */
         202                 :     "delete",                   /* deleteAtom                   */
         203                 :     "getOwnPropertyNames",      /* getOwnPropertyNames          */
         204                 :     "enumerate",                /* enumerateAtom                */
         205                 :     "fix",                      /* fixAtom                      */
         206                 :
         207                 :     "has",                      /* hasAtom                      */
         208                 :     "hasOwn",                   /* hasOwnAtom                   */
         209                 :     "keys",                     /* keysAtom                     */
         210                 :     "iterate",                  /* iterateAtom                  */
         211                 :
         212                 :     "WeakMap",                  /* WeakMapAtom                  */
         213                 :
         214                 :     "byteLength",               /* byteLengthAtom               */
         215                 :
         216                 :     "return",                   /* returnAtom                   */
         217                 :     "throw"                     /* throwAtom                    */
         218                 : };
         219                 :
         220                 : void
         221               0 : JSAtomState::checkStaticInvariants()
         222                 : {
         223                 :     /*
         224                 :      * Start and limit offsets for atom pointers in JSAtomState must be aligned
         225                 :      * on the word boundary.
         226                 :      */
         227                 :     JS_STATIC_ASSERT(commonAtomsOffset % sizeof(JSAtom *) == 0);
         228                 :     JS_STATIC_ASSERT(sizeof(*this) % sizeof(JSAtom *) == 0);
         229                 :
         230                 :     /*
         231                 :      * JS_BOOLEAN_STR and JS_TYPE_STR assume that boolean names starts from the
         232                 :      * index 1 and type name starts from the index 1+2 atoms in JSAtomState.
         233                 :      */
         234                 :     JS_STATIC_ASSERT(1 * sizeof(JSAtom *) ==
         235                 :                      offsetof(JSAtomState, booleanAtoms) - commonAtomsOffset);
         236                 :     JS_STATIC_ASSERT((1 + 2) * sizeof(JSAtom *) ==
         237                 :                      offsetof(JSAtomState, typeAtoms) - commonAtomsOffset);
         238                 :
         239                 :     JS_STATIC_ASSERT(JS_ARRAY_LENGTH(js_common_atom_names) * sizeof(JSAtom *) ==
         240                 :                      lazyAtomsOffset - commonAtomsOffset);
         241               0 : }
         242                 :
         243                 : /*
         244                 :  * Interpreter macros called by the trace recorder assume common atom indexes
         245                 :  * fit in one byte of immediate operand.
         246                 :  */
         247                 : JS_STATIC_ASSERT(JS_ARRAY_LENGTH(js_common_atom_names) < 256);
         248                 :
         249                 : const size_t js_common_atom_count = JS_ARRAY_LENGTH(js_common_atom_names);
         250                 :
         251                 : const char js_anonymous_str[]       = "anonymous";
         252                 : const char js_apply_str[]           = "apply";
         253                 : const char js_arguments_str[]       = "arguments";
         254                 : const char js_arity_str[]           = "arity";
         255                 : const char js_BYTES_PER_ELEMENT_str[] = "BYTES_PER_ELEMENT";
         256                 : const char js_call_str[]            = "call";
         257                 : const char js_callee_str[]          = "callee";
         258                 : const char js_caller_str[]          = "caller";
         259                 : const char js_class_prototype_str[] = "prototype";
         260                 : const char js_constructor_str[]     = "constructor";
         261                 : const char js_each_str[]            = "each";
         262                 : const char js_eval_str[]            = "eval";
         263                 : const char js_fileName_str[]        = "fileName";
         264                 : const char js_get_str[]             = "get";
         265                 : const char js_getter_str[]          = "getter";
         266                 : const char js_global_str[]          = "global";
         267                 : const char js_ignoreCase_str[]      = "ignoreCase";
         268                 : const char js_index_str[]           = "index";
         269                 : const char js_input_str[]           = "input";
         270                 : const char js_iterator_str[]        = "__iterator__";
         271                 : const char js_join_str[]            = "join";
         272                 : const char js_lastIndex_str[]       = "lastIndex";
         273                 : const char js_length_str[]          = "length";
         274                 : const char js_lineNumber_str[]      = "lineNumber";
         275                 : const char js_message_str[]         = "message";
         276                 : const char js_multiline_str[]       = "multiline";
         277                 : const char js_name_str[]            = "name";
         278                 : const char js_next_str[]            = "next";
         279                 : const char js_noSuchMethod_str[]    = "__noSuchMethod__";
         280                 : const char js_object_str[]          = "object";
         281                 : const char js_proto_str[]           = "__proto__";
         282                 : const char js_setter_str[]          = "setter";
         283                 : const char js_set_str[]             = "set";
         284                 : const char js_source_str[]          = "source";
         285                 : const char js_stack_str[]           = "stack";
         286                 : const char js_sticky_str[]          = "sticky";
         287                 : const char js_toGMTString_str[]     = "toGMTString";
         288                 : const char js_toLocaleString_str[]  = "toLocaleString";
         289                 : const char js_toSource_str[]        = "toSource";
         290                 : const char js_toString_str[]        = "toString";
         291                 : const char js_toUTCString_str[]     = "toUTCString";
         292                 : const char js_undefined_str[]       = "undefined";
         293                 : const char js_valueOf_str[]         = "valueOf";
         294                 : const char js_toJSON_str[]          = "toJSON";
         295                 : const char js_enumerable_str[]      = "enumerable";
         296                 : const char js_configurable_str[]    = "configurable";
         297                 : const char js_writable_str[]        = "writable";
         298                 : const char js_value_str[]           = "value";
         299                 : const char js_test_str[]            = "test";
         300                 :
         301                 : #if JS_HAS_XML_SUPPORT
         302                 : const char js_etago_str[]           = "</";
         303                 : const char js_namespace_str[]       = "namespace";
         304                 : const char js_ptagc_str[]           = "/>";
         305                 : const char js_qualifier_str[]       = "::";
         306                 : const char js_space_str[]           = " ";
         307                 : const char js_stago_str[]           = "<";
         308                 : const char js_star_str[]            = "*";
         309                 : const char js_starQualifier_str[]   = "*::";
         310                 : const char js_tagc_str[]            = ">";
         311                 : const char js_xml_str[]             = "xml";
         312                 : #endif
         313                 :
         314                 : #if JS_HAS_GENERATORS
         315                 : const char js_close_str[]           = "close";
         316                 : const char js_send_str[]            = "send";
         317                 : #endif
         318                 :
         319                 : /*
         320                 :  * For a browser build from 2007-08-09 after the browser starts up there are
         321                 :  * just 55 double atoms, but over 15000 string atoms. Not to penalize more
         322                 :  * economical embeddings allocating too much memory initially we initialize
         323                 :  * atomized strings with just 1K entries.
         324                 :  */
         325                 : #define JS_STRING_HASH_COUNT   1024
         326                 :
         327                 : JSBool
         328           19910 : js_InitAtomState(JSRuntime *rt)
         329                 : {
         330           19910 :     JSAtomState *state = &rt->atomState;
         331                 :
         332           19910 :     JS_ASSERT(!state->atoms.initialized());
         333           19910 :     if (!state->atoms.init(JS_STRING_HASH_COUNT))
         334               0 :         return false;
         335                 :
         336           19910 :     JS_ASSERT(state->atoms.initialized());
         337           19910 :     return true;
         338                 : }
         339                 :
         340                 : void
         341           19908 : js_FinishAtomState(JSRuntime *rt)
         342                 : {
         343           19908 :     JSAtomState *state = &rt->atomState;
         344                 :
         345           19908 :     if (!state->atoms.initialized()) {
         346                 :         /*
         347                 :          * We are called with uninitialized state when JS_NewRuntime fails and
         348                 :          * calls JS_DestroyRuntime on a partially initialized runtime.
         349                 :          */
         350               0 :         return;
         351                 :     }
         352                 :
         353         3678177 :     for (AtomSet::Range r = state->atoms.all(); !r.empty(); r.popFront())
         354         3658269 :         r.front().asPtr()->finalize(rt);
         355                 : }
         356                 :
         357                 : bool
         358           19910 : js_InitCommonAtoms(JSContext *cx)
         359                 : {
         360           19910 :     JSAtomState *state = &cx->runtime->atomState;
         361           19910 :     JSAtom **atoms = state->commonAtomsStart();
         362         2687850 :     for (size_t i = 0; i < ArrayLength(js_common_atom_names); i++, atoms++) {
         363                 :         JSAtom *atom = js_Atomize(cx, js_common_atom_names[i], strlen(js_common_atom_names[i]),
         364         2667940 :                                   InternAtom);
         365         2667940 :         if (!atom)
         366               0 :             return false;
         367         2667940 :         *atoms = atom->asPropertyName();
         368                 :     }
         369                 :
         370           19910 :     state->clearLazyAtoms();
         371           19910 :     cx->runtime->emptyString = state->emptyAtom;
         372           19910 :     return true;
         373                 : }
         374                 :
         375                 : void
         376           19908 : js_FinishCommonAtoms(JSContext *cx)
         377                 : {
         378           19908 :     cx->runtime->emptyString = NULL;
         379           19908 :     cx->runtime->atomState.junkAtoms();
         380           19908 : }
         381                 :
         382                 : void
         383           54466 : js_TraceAtomState(JSTracer *trc)
         384                 : {
         385           54466 :     JSRuntime *rt = trc->runtime;
         386           54466 :     JSAtomState *state = &rt->atomState;
         387                 :
         388           54466 :     if (rt->gcKeepAtoms) {
         389         5465720 :         for (AtomSet::Range r = state->atoms.all(); !r.empty(); r.popFront()) {
         390         5456668 :             JSAtom *tmp = r.front().asPtr();
         391         5456668 :             MarkStringRoot(trc, &tmp, "locked_atom");
         392         5456668 :             JS_ASSERT(tmp == r.front().asPtr());
         393                 :         }
         394                 :     } else {
         395        95187791 :         for (AtomSet::Range r = state->atoms.all(); !r.empty(); r.popFront()) {
         396        95142377 :             AtomStateEntry entry = r.front();
         397        95142377 :             if (!entry.isTagged())
         398        79872540 :                 continue;
         399                 :
         400        15269837 :             JSAtom *tmp = entry.asPtr();
         401        15269837 :             MarkStringRoot(trc, &tmp, "interned_atom");
         402        15269837 :             JS_ASSERT(tmp == entry.asPtr());
         403                 :         }
         404                 :     }
         405           54466 : }
         406                 :
         407                 : void
         408           51092 : js_SweepAtomState(JSRuntime *rt)
         409                 : {
         410           51092 :     JSAtomState *state = &rt->atomState;
         411                 :
         412        98722146 :     for (AtomSet::Enum e(state->atoms); !e.empty(); e.popFront()) {
         413        98671054 :         AtomStateEntry entry = e.front();
         414                 :
         415        98671054 :         if (entry.isTagged()) {
         416                 :             /* Pinned or interned key cannot be finalized. */
         417        16118769 :             JS_ASSERT(!IsAboutToBeFinalized(entry.asPtr()));
         418        16118769 :             continue;
         419                 :         }
         420                 :
         421        82552285 :         if (IsAboutToBeFinalized(entry.asPtr()))
         422        15377535 :             e.removeFront();
         423                 :     }
         424           51092 : }
         425                 :
         426                 : bool
         427         4237985 : AtomIsInterned(JSContext *cx, JSAtom *atom)
         428                 : {
         429                 :     /* We treat static strings as interned because they're never collected. */
         430         4237985 :     if (StaticStrings::isStatic(atom))
         431            6752 :         return true;
         432                 :
         433         4231233 :     AtomSet::Ptr p = cx->runtime->atomState.atoms.lookup(atom);
         434         4231233 :     if (!p)
         435               0 :         return false;
         436                 :
         437         4231233 :     return p->isTagged();
         438                 : }
         439                 :
         440                 : enum OwnCharsBehavior
         441                 : {
         442                 :     CopyChars, /* in other words, do not take ownership */
         443                 :     TakeCharOwnership
         444                 : };
         445                 :
         446                 : /*
         447                 :  * Callers passing OwnChars have freshly allocated *pchars and thus this
         448                 :  * memory can be used as a new JSAtom's buffer without copying. When this flag
         449                 :  * is set, the contract is that callers will free *pchars iff *pchars == NULL.
         450                 :  */
         451                 : JS_ALWAYS_INLINE
         452                 : static JSAtom *
         453        77119232 : AtomizeInline(JSContext *cx, const jschar **pchars, size_t length,
         454                 :               InternBehavior ib, OwnCharsBehavior ocb = CopyChars)
         455                 : {
         456        77119232 :     const jschar *chars = *pchars;
         457                 :
         458        77119232 :     if (JSAtom *s = cx->runtime->staticStrings.lookup(chars, length))
         459         4646743 :         return s;
         460                 :
         461        72472489 :     AtomSet &atoms = cx->runtime->atomState.atoms;
         462        72472489 :     AtomSet::AddPtr p = atoms.lookupForAdd(AtomHasher::Lookup(chars, length));
         463                 :
         464        72472489 :     if (p) {
         465        53435395 :         JSAtom *atom = p->asPtr();
         466        53435395 :         p->setTagged(bool(ib));
         467        53435395 :         return atom;
         468                 :     }
         469                 :
         470        38074188 :     SwitchToCompartment sc(cx, cx->runtime->atomsCompartment);
         471                 :
         472                 :     JSFixedString *key;
         473                 :
         474        19037094 :     if (ocb == TakeCharOwnership) {
         475         1273643 :         key = js_NewString(cx, const_cast<jschar *>(chars), length);
         476         1273643 :         if (!key)
         477               0 :             return NULL;
         478         1273643 :         *pchars = NULL; /* Called should not free *pchars. */
         479                 :     } else {
         480        17763451 :         JS_ASSERT(ocb == CopyChars);
         481        17763451 :         key = js_NewStringCopyN(cx, chars, length);
         482        17763451 :         if (!key)
         483               0 :             return NULL;
         484                 :     }
         485                 :
         486                 :     /*
         487                 :      * We have to relookup the key as the last ditch GC invoked from the
         488                 :      * string allocation or OOM handling unlocks the atomsCompartment.
         489                 :      *
         490                 :      * N.B. this avoids recomputing the hash but still has a potential
         491                 :      * (# collisions * # chars) comparison cost in the case of a hash
         492                 :      * collision!
         493                 :      */
         494        19037094 :     AtomHasher::Lookup lookup(chars, length);
         495        19037094 :     if (!atoms.relookupOrAdd(p, lookup, AtomStateEntry((JSAtom *) key, bool(ib)))) {
         496               0 :         JS_ReportOutOfMemory(cx); /* SystemAllocPolicy does not report */
         497               0 :         return NULL;
         498                 :     }
         499                 :
         500        19037094 :     return key->morphAtomizedStringIntoAtom();
         501                 : }
         502                 :
         503                 : static JSAtom *
         504        38723396 : Atomize(JSContext *cx, const jschar **pchars, size_t length,
         505                 :         InternBehavior ib, OwnCharsBehavior ocb = CopyChars)
         506                 : {
         507        38723396 :     return AtomizeInline(cx, pchars, length, ib, ocb);
         508                 : }
         509                 :
         510                 : JSAtom *
         511         5315630 : js_AtomizeString(JSContext *cx, JSString *str, InternBehavior ib)
         512                 : {
         513         5315630 :     if (str->isAtom()) {
         514         1267657 :         JSAtom &atom = str->asAtom();
         515                 :         /* N.B. static atoms are effectively always interned. */
         516         1267657 :         if (ib != InternAtom || js::StaticStrings::isStatic(&atom))
         517         1267656 :             return &atom;
         518                 :
         519               1 :         AtomSet &atoms = cx->runtime->atomState.atoms;
         520               1 :         AtomSet::Ptr p = atoms.lookup(AtomHasher::Lookup(&atom));
         521               1 :         JS_ASSERT(p); /* Non-static atom must exist in atom state set. */
         522               1 :         JS_ASSERT(p->asPtr() == &atom);
         523               1 :         JS_ASSERT(ib == InternAtom);
         524               1 :         p->setTagged(bool(ib));
         525               1 :         return &atom;
         526                 :     }
         527                 :
         528         4047973 :     if (str->isAtom())
         529               0 :         return &str->asAtom();
         530                 :
         531         4047973 :     size_t length = str->length();
         532         4047973 :     const jschar *chars = str->getChars(cx);
         533         4047973 :     if (!chars)
         534               0 :         return NULL;
         535                 :
         536         4047973 :     JS_ASSERT(length <= JSString::MAX_LENGTH);
         537         4047973 :     return Atomize(cx, &chars, length, ib);
         538                 : }
         539                 :
         540                 : JSAtom *
         541        34675423 : js_Atomize(JSContext *cx, const char *bytes, size_t length, InternBehavior ib, FlationCoding fc)
         542                 : {
         543        69350846 :     CHECK_REQUEST(cx);
         544                 :
         545        34675423 :     if (!JSString::validateLength(cx, length))
         546               0 :         return NULL;
         547                 :
         548                 :     /*
         549                 :      * Avoiding the malloc in InflateString on shorter strings saves us
         550                 :      * over 20,000 malloc calls on mozilla browser startup. This compares to
         551                 :      * only 131 calls where the string is longer than a 31 char (net) buffer.
         552                 :      * The vast majority of atomized strings are already in the hashtable. So
         553                 :      * js_AtomizeString rarely has to copy the temp string we make.
         554                 :      */
         555                 :     static const unsigned ATOMIZE_BUF_MAX = 32;
         556                 :     jschar inflated[ATOMIZE_BUF_MAX];
         557        34675423 :     size_t inflatedLength = ATOMIZE_BUF_MAX - 1;
         558                 :
         559                 :     const jschar *chars;
         560        34675423 :     OwnCharsBehavior ocb = CopyChars;
         561        34675423 :     if (length < ATOMIZE_BUF_MAX) {
         562        33091883 :         if (fc == CESU8Encoding)
         563               0 :             InflateUTF8StringToBuffer(cx, bytes, length, inflated, &inflatedLength, fc);
         564                 :         else
         565        33091883 :             InflateStringToBuffer(cx, bytes, length, inflated, &inflatedLength);
         566        33091883 :         inflated[inflatedLength] = 0;
         567        33091883 :         chars = inflated;
         568                 :     } else {
         569         1583540 :         inflatedLength = length;
         570         1583540 :         chars = InflateString(cx, bytes, &inflatedLength, fc);
         571         1583540 :         if (!chars)
         572               0 :             return NULL;
         573         1583540 :         ocb = TakeCharOwnership;
         574                 :     }
         575                 :
         576        34675423 :     JSAtom *atom = Atomize(cx, &chars, inflatedLength, ib, ocb);
         577        34675423 :     if (ocb == TakeCharOwnership && chars)
         578          309897 :         cx->free_((void *)chars);
         579        34675423 :     return atom;
         580                 : }
         581                 :
         582                 : JSAtom *
         583        38395836 : js_AtomizeChars(JSContext *cx, const jschar *chars, size_t length, InternBehavior ib)
         584                 : {
         585        76791672 :     CHECK_REQUEST(cx);
         586                 :
         587        38395836 :     if (!JSString::validateLength(cx, length))
         588               0 :         return NULL;
         589                 :
         590        38395836 :     return AtomizeInline(cx, &chars, length, ib);
         591                 : }
         592                 :
         593                 : JSAtom *
         594               0 : js_GetExistingStringAtom(JSContext *cx, const jschar *chars, size_t length)
         595                 : {
         596               0 :     if (JSAtom *atom = cx->runtime->staticStrings.lookup(chars, length))
         597               0 :         return atom;
         598               0 :     if (AtomSet::Ptr p = cx->runtime->atomState.atoms.lookup(AtomHasher::Lookup(chars, length)))
         599               0 :         return p->asPtr();
         600               0 :     return NULL;
         601                 : }
         602                 :
         603                 : #ifdef DEBUG
         604                 : JS_FRIEND_API(void)
         605               0 : js_DumpAtoms(JSContext *cx, FILE *fp)
         606                 : {
         607               0 :     JSAtomState *state = &cx->runtime->atomState;
         608                 :
         609               0 :     fprintf(fp, "atoms table contents:\n");
         610               0 :     unsigned number = 0;
         611               0 :     for (AtomSet::Range r = state->atoms.all(); !r.empty(); r.popFront()) {
         612               0 :         AtomStateEntry entry = r.front();
         613               0 :         fprintf(fp, "%3u ", number++);
         614               0 :         JSAtom *key = entry.asPtr();
         615               0 :         FileEscapedString(fp, key, '"');
         616               0 :         if (entry.isTagged())
         617               0 :             fputs(" interned", fp);
         618               0 :         putc('\n', fp);
         619                 :     }
         620               0 :     putc('\n', fp);
         621               0 : }
         622                 : #endif
         623                 :
         624                 : #if JS_BITS_PER_WORD == 32
         625                 : # define TEMP_SIZE_START_LOG2   5
         626                 : #else
         627                 : # define TEMP_SIZE_START_LOG2   6
         628                 : #endif
         629                 : #define TEMP_SIZE_LIMIT_LOG2    (TEMP_SIZE_START_LOG2 + NUM_TEMP_FREELISTS)
         630                 :
         631                 : #define TEMP_SIZE_START         JS_BIT(TEMP_SIZE_START_LOG2)
         632                 : #define TEMP_SIZE_LIMIT         JS_BIT(TEMP_SIZE_LIMIT_LOG2)
         633                 :
         634                 : JS_STATIC_ASSERT(TEMP_SIZE_START >= sizeof(JSHashTable));
         635                 :
         636                 : void
         637         1109121 : js_InitAtomMap(JSContext *cx, AtomIndexMap *indices, JSAtom **atoms)
         638                 : {
         639         1109121 :     if (indices->isMap()) {
         640                 :         typedef AtomIndexMap::WordMap WordMap;
         641           73192 :         const WordMap &wm = indices->asMap();
         642         6927467 :         for (WordMap::Range r = wm.all(); !r.empty(); r.popFront()) {
         643         6854275 :             JSAtom *atom = r.front().key;
         644         6854275 :             jsatomid index = r.front().value;
         645         6854275 :             JS_ASSERT(index < indices->count());
         646         6854275 :             atoms[index] = atom;
         647                 :         }
         648                 :     } else {
         649         7008566 :         for (const AtomIndexMap::InlineElem *it = indices->asInline(), *end = indices->inlineEnd();
         650                 :              it != end; ++it) {
         651         5972637 :             JSAtom *atom = it->key;
         652         5972637 :             if (!atom)
         653               0 :                 continue;
         654         5972637 :             JS_ASSERT(it->value < indices->count());
         655         5972637 :             atoms[it->value] = atom;
         656                 :         }
         657                 :     }
         658         1109121 : }
         659                 :
         660                 : namespace js {
         661                 :
         662                 : bool
         663             233 : IndexToIdSlow(JSContext *cx, uint32_t index, jsid *idp)
         664                 : {
         665             233 :     JS_ASSERT(index > JSID_INT_MAX);
         666                 :
         667                 :     jschar buf[UINT32_CHAR_BUFFER_LENGTH];
         668             233 :     RangedPtr<jschar> end(ArrayEnd(buf), buf, ArrayEnd(buf));
         669             233 :     RangedPtr<jschar> start = BackfillIndexInCharBuffer(index, end);
         670                 :
         671             233 :     JSAtom *atom = js_AtomizeChars(cx, start.get(), end - start);
         672             233 :     if (!atom)
         673               0 :         return false;
         674                 :
         675             233 :     *idp = ATOM_TO_JSID(atom);
         676             233 :     JS_ASSERT(js_CheckForStringIndex(*idp) == *idp);
         677             233 :     return true;
         678                 : }
         679                 :
         680                 : } /* namespace js */
         681                 :
         682                 : /* JSBOXEDWORD_INT_MAX as a string */
         683                 : #define JSBOXEDWORD_INT_MAX_STRING "1073741823"
         684                 :
         685                 : /*
         686                 :  * Convert string indexes that convert to int jsvals as ints to save memory.
         687                 :  * Care must be taken to use this macro every time a property name is used, or
         688                 :  * else double-sets, incorrect property cache misses, or other mistakes could
         689                 :  * occur.
         690                 :  */
         691                 : jsid
         692       399935245 : js_CheckForStringIndex(jsid id)
         693                 : {
         694       399935245 :     if (!JSID_IS_ATOM(id))
         695       118001644 :         return id;
         696                 :
         697       281933601 :     JSAtom *atom = JSID_TO_ATOM(id);
         698       281933601 :     const jschar *s = atom->chars();
         699       281933602 :     jschar ch = *s;
         700                 :
         701       281933602 :     JSBool negative = (ch == '-');
         702       281933602 :     if (negative)
         703           28352 :         ch = *++s;
         704                 :
         705       281933602 :     if (!JS7_ISDEC(ch))
         706       279875898 :         return id;
         707                 :
         708         2057704 :     size_t n = atom->length() - negative;
         709         2057704 :     if (n > sizeof(JSBOXEDWORD_INT_MAX_STRING) - 1)
         710            3471 :         return id;
         711                 :
         712         2054233 :     const jschar *cp = s;
         713         2054233 :     const jschar *end = s + n;
         714                 :
         715         2054233 :     uint32_t index = JS7_UNDEC(*cp++);
         716         2054233 :     uint32_t oldIndex = 0;
         717         2054233 :     uint32_t c = 0;
         718                 :
         719         2054233 :     if (index != 0) {
         720         4320279 :         while (JS7_ISDEC(*cp)) {
         721          513489 :             oldIndex = index;
         722          513489 :             c = JS7_UNDEC(*cp);
         723          513489 :             index = 10 * index + c;
         724          513489 :             cp++;
         725                 :         }
         726                 :     }
         727                 :
         728                 :     /*
         729                 :      * Non-integer indexes can't be represented as integers.  Also, distinguish
         730                 :      * index "-0" from "0", because JSBOXEDWORD_INT cannot.
         731                 :      */
         732         2054233 :     if (cp != end || (negative && index == 0))
         733          887041 :         return id;
         734                 :
         735         1167192 :     if (negative) {
         736            3321 :         if (oldIndex < -(JSID_INT_MIN / 10) ||
         737                 :             (oldIndex == -(JSID_INT_MIN / 10) && c <= (-JSID_INT_MIN % 10)))
         738                 :         {
         739            2574 :             id = INT_TO_JSID(-int32_t(index));
         740                 :         }
         741                 :     } else {
         742         1163871 :         if (oldIndex < JSID_INT_MAX / 10 ||
         743                 :             (oldIndex == JSID_INT_MAX / 10 && c <= (JSID_INT_MAX % 10)))
         744                 :         {
         745         1162936 :             id = INT_TO_JSID(int32_t(index));
         746                 :         }
         747                 :     }
         748                 :
         749         1167192 :     return id;
         750                 : }
         751                 :
         752                 : #if JS_HAS_XML_SUPPORT
         753                 : bool
         754               6 : js_InternNonIntElementIdSlow(JSContext *cx, JSObject *obj, const Value &idval,
         755                 :                              jsid *idp)
         756                 : {
         757               6 :     JS_ASSERT(idval.isObject());
         758               6 :     if (obj->isXML()) {
         759               0 :         *idp = OBJECT_TO_JSID(&idval.toObject());
         760               0 :         return true;
         761                 :     }
         762                 :
         763               6 :     if (js_GetLocalNameFromFunctionQName(&idval.toObject(), idp, cx))
         764               0 :         return true;
         765                 :
         766               6 :     return js_ValueToStringId(cx, idval, idp);
         767                 : }
         768                 :
         769                 : bool
         770            3479 : js_InternNonIntElementIdSlow(JSContext *cx, JSObject *obj, const Value &idval,
         771                 :                              jsid *idp, Value *vp)
         772                 : {
         773            3479 :     JS_ASSERT(idval.isObject());
         774            3479 :     if (obj->isXML()) {
         775               0 :         JSObject &idobj = idval.toObject();
         776               0 :         *idp = OBJECT_TO_JSID(&idobj);
         777               0 :         vp->setObject(idobj);
         778               0 :         return true;
         779                 :     }
         780                 :
         781            3479 :     if (js_GetLocalNameFromFunctionQName(&idval.toObject(), idp, cx)) {
         782               9 :         *vp = IdToValue(*idp);
         783               9 :         return true;
         784                 :     }
         785                 :
         786            3470 :     if (js_ValueToStringId(cx, idval, idp)) {
         787            3470 :         vp->setString(JSID_TO_STRING(*idp));
         788            3470 :         return true;
         789                 :     }
         790               0 :     return false;
         791                 : }
         792                 : #endif

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