LCOV - code coverage report
Current view: directory - js/src - jscompartment.h (source / functions) Found Hit Coverage
Test: app.info Lines: 125 118 94.4 %
Date: 2012-04-07 Functions: 44 42 95.5 %

       1                 : /* -*- Mode: C++; tab-width: 4; 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 SpiderMonkey code.
      17                 :  *
      18                 :  * The Initial Developer of the Original Code is
      19                 :  * Mozilla Corporation.
      20                 :  * Portions created by the Initial Developer are Copyright (C) 2010
      21                 :  * the Initial Developer. All Rights Reserved.
      22                 :  *
      23                 :  * Contributor(s):
      24                 :  *
      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                 : #ifndef jscompartment_h___
      41                 : #define jscompartment_h___
      42                 : 
      43                 : #include "mozilla/Attributes.h"
      44                 : 
      45                 : #include "jsclist.h"
      46                 : #include "jscntxt.h"
      47                 : #include "jsfun.h"
      48                 : #include "jsgc.h"
      49                 : #include "jsobj.h"
      50                 : #include "jsscope.h"
      51                 : #include "vm/GlobalObject.h"
      52                 : #include "vm/RegExpObject.h"
      53                 : 
      54                 : #ifdef _MSC_VER
      55                 : #pragma warning(push)
      56                 : #pragma warning(disable:4251) /* Silence warning about JS_FRIEND_API and data members. */
      57                 : #endif
      58                 : 
      59                 : namespace js {
      60                 : 
      61                 : typedef HashMap<JSFunction *,
      62                 :                 JSString *,
      63                 :                 DefaultHasher<JSFunction *>,
      64                 :                 SystemAllocPolicy> ToSourceCache;
      65                 : 
      66                 : namespace mjit {
      67                 : class JaegerCompartment;
      68                 : }
      69                 : 
      70                 : /* Defined in jsapi.cpp */
      71                 : extern Class dummy_class;
      72                 : 
      73                 : } /* namespace js */
      74                 : 
      75                 : #ifndef JS_EVAL_CACHE_SHIFT
      76                 : # define JS_EVAL_CACHE_SHIFT        6
      77                 : #endif
      78                 : 
      79                 : /* Number of buckets in the hash of eval scripts. */
      80                 : #define JS_EVAL_CACHE_SIZE          JS_BIT(JS_EVAL_CACHE_SHIFT)
      81                 : 
      82                 : namespace js {
      83                 : 
      84                 : class NativeIterCache {
      85                 :     static const size_t SIZE = size_t(1) << 8;
      86                 :     
      87                 :     /* Cached native iterators. */
      88                 :     JSObject            *data[SIZE];
      89                 : 
      90           10405 :     static size_t getIndex(uint32_t key) {
      91           10405 :         return size_t(key) % SIZE;
      92                 :     }
      93                 : 
      94                 :   public:
      95                 :     /* Native iterator most recently started. */
      96                 :     JSObject            *last;
      97                 : 
      98           41285 :     NativeIterCache()
      99           41285 :       : last(NULL) {
     100           41285 :         PodArrayZero(data);
     101           41285 :     }
     102                 : 
     103           89042 :     void purge() {
     104           89042 :         PodArrayZero(data);
     105           89042 :         last = NULL;
     106           89042 :     }
     107                 : 
     108            8720 :     JSObject *get(uint32_t key) const {
     109            8720 :         return data[getIndex(key)];
     110                 :     }
     111                 : 
     112            1685 :     void set(uint32_t key, JSObject *iterobj) {
     113            1685 :         data[getIndex(key)] = iterobj;
     114            1685 :     }
     115                 : };
     116                 : 
     117                 : class MathCache;
     118                 : 
     119                 : /*
     120                 :  * A single-entry cache for some base-10 double-to-string conversions. This
     121                 :  * helps date-format-xparb.js.  It also avoids skewing the results for
     122                 :  * v8-splay.js when measured by the SunSpider harness, where the splay tree
     123                 :  * initialization (which includes many repeated double-to-string conversions)
     124                 :  * is erroneously included in the measurement; see bug 562553.
     125                 :  */
     126                 : class DtoaCache {
     127                 :     double        d;
     128                 :     int         base;
     129                 :     JSFixedString *s;      // if s==NULL, d and base are not valid
     130                 :   public:
     131           41285 :     DtoaCache() : s(NULL) {}
     132           89042 :     void purge() { s = NULL; }
     133                 : 
     134        41750151 :     JSFixedString *lookup(int base, double d) {
     135        41750151 :         return this->s && base == this->base && d == this->d ? this->s : NULL;
     136                 :     }
     137                 : 
     138        39027547 :     void cache(int base, double d, JSFixedString *s) {
     139        39027547 :         this->base = base;
     140        39027547 :         this->d = d;
     141        39027547 :         this->s = s;
     142        39027547 :     }
     143                 : 
     144                 : };
     145                 : 
     146                 : struct ScriptFilenameEntry
     147                 : {
     148                 :     bool marked;
     149                 :     char filename[1];
     150                 : };
     151                 : 
     152                 : struct ScriptFilenameHasher
     153                 : {
     154                 :     typedef const char *Lookup;
     155         6038588 :     static HashNumber hash(const char *l) { return JS_HashString(l); }
     156         5977420 :     static bool match(const ScriptFilenameEntry *e, const char *l) {
     157         5977420 :         return strcmp(e->filename, l) == 0;
     158                 :     }
     159                 : };
     160                 : 
     161                 : typedef HashSet<ScriptFilenameEntry *,
     162                 :                 ScriptFilenameHasher,
     163                 :                 SystemAllocPolicy> ScriptFilenameTable;
     164                 : 
     165                 : /* If HashNumber grows, need to change WrapperHasher. */
     166                 : JS_STATIC_ASSERT(sizeof(HashNumber) == 4);
     167                 : 
     168                 : struct WrapperHasher
     169                 : {
     170                 :     typedef Value Lookup;
     171                 : 
     172          156380 :     static HashNumber hash(Value key) {
     173          156380 :         uint64_t bits = JSVAL_TO_IMPL(key).asBits;
     174          156380 :         return uint32_t(bits) ^ uint32_t(bits >> 32);
     175                 :     }
     176                 : 
     177           66073 :     static bool match(const Value &l, const Value &k) { return l == k; }
     178                 : };
     179                 : 
     180                 : typedef HashMap<Value, ReadBarrieredValue, WrapperHasher, SystemAllocPolicy> WrapperMap;
     181                 : 
     182                 : } /* namespace js */
     183                 : 
     184                 : namespace JS {
     185                 : struct TypeInferenceSizes;
     186                 : }
     187                 : 
     188                 : struct JSCompartment
     189                 : {
     190                 :     JSRuntime                    *rt;
     191                 :     JSPrincipals                 *principals;
     192                 : 
     193                 :     js::gc::ArenaLists           arenas;
     194                 : 
     195                 :     bool                         needsBarrier_;
     196                 : 
     197       539854494 :     bool needsBarrier() const {
     198       539854494 :         return needsBarrier_;
     199                 :     }
     200                 : 
     201          152440 :     js::GCMarker *barrierTracer() {
     202          152440 :         JS_ASSERT(needsBarrier_);
     203          152440 :         return &rt->gcMarker;
     204                 :     }
     205                 : 
     206                 :   private:
     207                 :     enum CompartmentGCState {
     208                 :         NoGCScheduled,
     209                 :         GCScheduled,
     210                 :         GCRunning
     211                 :     };
     212                 : 
     213                 :     CompartmentGCState           gcState;
     214                 : 
     215                 :   public:
     216       860227806 :     bool isCollecting() const {
     217                 :         /* Allow this if we're in the middle of an incremental GC. */
     218       860227806 :         if (rt->gcRunning) {
     219       859839113 :             return gcState == GCRunning;
     220                 :         } else {
     221          388693 :             JS_ASSERT(gcState != GCRunning);
     222          388693 :             return needsBarrier();
     223                 :         }
     224                 :     }
     225                 : 
     226                 :     /*
     227                 :      * If this returns true, all object tracing must be done with a GC marking
     228                 :      * tracer.
     229                 :      */
     230       263204738 :     bool requireGCTracer() const {
     231       263204738 :         return gcState == GCRunning;
     232                 :     }
     233                 : 
     234          145068 :     void setCollecting(bool collecting) {
     235          145068 :         JS_ASSERT(rt->gcRunning);
     236          145068 :         if (collecting)
     237           83796 :             gcState = GCRunning;
     238                 :         else
     239           61272 :             gcState = NoGCScheduled;
     240          145068 :     }
     241                 : 
     242          181865 :     void scheduleGC() {
     243          181865 :         JS_ASSERT(!rt->gcRunning);
     244          181865 :         JS_ASSERT(gcState != GCRunning);
     245          181865 :         gcState = GCScheduled;
     246          181865 :     }
     247                 : 
     248          192109 :     bool isGCScheduled() const {
     249          192109 :         return gcState == GCScheduled;
     250                 :     }
     251                 : 
     252                 :     size_t                       gcBytes;
     253                 :     size_t                       gcTriggerBytes;
     254                 :     size_t                       gcMaxMallocBytes;
     255                 : 
     256                 :     bool                         hold;
     257                 :     bool                         isSystemCompartment;
     258                 : 
     259                 :     /*
     260                 :      * Pool for analysis and intermediate type information in this compartment.
     261                 :      * Cleared on every GC, unless the GC happens during analysis (indicated
     262                 :      * by activeAnalysis, which is implied by activeInference).
     263                 :      */
     264                 :     static const size_t TYPE_LIFO_ALLOC_PRIMARY_CHUNK_SIZE = 128 * 1024;
     265                 :     js::LifoAlloc                typeLifoAlloc;
     266                 :     bool                         activeAnalysis;
     267                 :     bool                         activeInference;
     268                 : 
     269                 :     /* Type information about the scripts and objects in this compartment. */
     270                 :     js::types::TypeCompartment   types;
     271                 : 
     272                 :   public:
     273                 :     /* Hashed lists of scripts created by eval to garbage-collect. */
     274                 :     JSScript                     *evalCache[JS_EVAL_CACHE_SIZE];
     275                 : 
     276                 :     void                         *data;
     277                 :     bool                         active;  // GC flag, whether there are active frames
     278                 :     js::WrapperMap               crossCompartmentWrappers;
     279                 : 
     280                 : #ifdef JS_METHODJIT
     281                 :   private:
     282                 :     /* This is created lazily because many compartments don't need it. */
     283                 :     js::mjit::JaegerCompartment  *jaegerCompartment_;
     284                 :     /*
     285                 :      * This function is here so that xpconnect/src/xpcjsruntime.cpp doesn't
     286                 :      * need to see the declaration of JaegerCompartment, which would require
     287                 :      * #including MethodJIT.h into xpconnect/src/xpcjsruntime.cpp, which is
     288                 :      * difficult due to reasons explained in bug 483677.
     289                 :      */
     290                 :   public:
     291         1208590 :     bool hasJaegerCompartment() {
     292         1208590 :         return !!jaegerCompartment_;
     293                 :     }
     294                 : 
     295         4549189 :     js::mjit::JaegerCompartment *jaegerCompartment() const {
     296         4549189 :         JS_ASSERT(jaegerCompartment_);
     297         4549189 :         return jaegerCompartment_;
     298                 :     }
     299                 : 
     300                 :     bool ensureJaegerCompartmentExists(JSContext *cx);
     301                 : 
     302                 :     size_t sizeOfMjitCode() const;
     303                 : #endif
     304                 : 
     305                 :     js::RegExpCompartment        regExps;
     306                 : 
     307                 :     size_t sizeOfShapeTable(JSMallocSizeOfFun mallocSizeOf);
     308                 :     void sizeOfTypeInferenceData(JS::TypeInferenceSizes *stats, JSMallocSizeOfFun mallocSizeOf);
     309                 : 
     310                 :     /*
     311                 :      * Shared scope property tree, and arena-pool for allocating its nodes.
     312                 :      */
     313                 :     js::PropertyTree             propertyTree;
     314                 : 
     315                 :     /* Set of all unowned base shapes in the compartment. */
     316                 :     js::BaseShapeSet             baseShapes;
     317                 :     void sweepBaseShapeTable();
     318                 : 
     319                 :     /* Set of initial shapes in the compartment. */
     320                 :     js::InitialShapeSet          initialShapes;
     321                 :     void sweepInitialShapeTable();
     322                 : 
     323                 :     /* Set of default 'new' or lazy types in the compartment. */
     324                 :     js::types::TypeObjectSet     newTypeObjects;
     325                 :     js::types::TypeObjectSet     lazyTypeObjects;
     326                 :     void sweepNewTypeObjectTable(js::types::TypeObjectSet &table);
     327                 : 
     328                 :     js::types::TypeObject        *emptyTypeObject;
     329                 : 
     330                 :     /* Get the default 'new' type for objects with a NULL prototype. */
     331                 :     inline js::types::TypeObject *getEmptyType(JSContext *cx);
     332                 : 
     333                 :     js::types::TypeObject *getLazyType(JSContext *cx, JSObject *proto);
     334                 : 
     335                 :     /* Cache to speed up object creation. */
     336                 :     js::NewObjectCache           newObjectCache;
     337                 : 
     338                 :     /*
     339                 :      * Keeps track of the total number of malloc bytes connected to a
     340                 :      * compartment's GC things. This counter should be used in preference to
     341                 :      * gcMallocBytes. These counters affect collection in the same way as
     342                 :      * gcBytes and gcTriggerBytes.
     343                 :      */
     344                 :     size_t                       gcMallocAndFreeBytes;
     345                 :     size_t                       gcTriggerMallocAndFreeBytes;
     346                 : 
     347                 :   private:
     348                 :     /*
     349                 :      * Malloc counter to measure memory pressure for GC scheduling. It runs from
     350                 :      * gcMaxMallocBytes down to zero. This counter should be used only when it's
     351                 :      * not possible to know the size of a free.
     352                 :      */
     353                 :     ptrdiff_t                    gcMallocBytes;
     354                 : 
     355                 :     enum { DebugFromC = 1, DebugFromJS = 2 };
     356                 : 
     357                 :     unsigned                     debugModeBits;  // see debugMode() below
     358                 : 
     359                 :   public:
     360                 :     js::NativeIterCache          nativeIterCache;
     361                 : 
     362                 :     typedef js::Maybe<js::ToSourceCache> LazyToSourceCache;
     363                 :     LazyToSourceCache            toSourceCache;
     364                 : 
     365                 :     js::ScriptFilenameTable      scriptFilenameTable;
     366                 : 
     367                 :     JSCompartment(JSRuntime *rt);
     368                 :     ~JSCompartment();
     369                 : 
     370                 :     bool init(JSContext *cx);
     371                 : 
     372                 :     /* Mark cross-compartment wrappers. */
     373                 :     void markCrossCompartmentWrappers(JSTracer *trc);
     374                 : 
     375                 :     bool wrap(JSContext *cx, js::Value *vp);
     376                 :     bool wrap(JSContext *cx, JSString **strp);
     377                 :     bool wrap(JSContext *cx, js::HeapPtrString *strp);
     378                 :     bool wrap(JSContext *cx, JSObject **objp);
     379                 :     bool wrapId(JSContext *cx, jsid *idp);
     380                 :     bool wrap(JSContext *cx, js::PropertyOp *op);
     381                 :     bool wrap(JSContext *cx, js::StrictPropertyOp *op);
     382                 :     bool wrap(JSContext *cx, js::PropertyDescriptor *desc);
     383                 :     bool wrap(JSContext *cx, js::AutoIdVector &props);
     384                 : 
     385                 :     void markTypes(JSTracer *trc);
     386                 :     void discardJitCode(js::FreeOp *fop);
     387                 :     void sweep(js::FreeOp *fop, bool releaseTypes);
     388                 :     void purge();
     389                 : 
     390                 :     void setGCLastBytes(size_t lastBytes, size_t lastMallocBytes, js::JSGCInvocationKind gckind);
     391                 :     void reduceGCTriggerBytes(size_t amount);
     392                 : 
     393                 :     void resetGCMallocBytes();
     394                 :     void setGCMaxMallocBytes(size_t value);
     395        16143748 :     void updateMallocCounter(size_t nbytes) {
     396        16143748 :         ptrdiff_t oldCount = gcMallocBytes;
     397        16143748 :         ptrdiff_t newCount = oldCount - ptrdiff_t(nbytes);
     398        16143748 :         gcMallocBytes = newCount;
     399        16143748 :         if (JS_UNLIKELY(newCount <= 0 && oldCount > 0))
     400             108 :             onTooMuchMalloc();
     401        16143748 :     }
     402                 : 
     403                 :     void onTooMuchMalloc();
     404                 : 
     405               0 :     void mallocInCompartment(size_t nbytes) {
     406               0 :         gcMallocAndFreeBytes += nbytes;
     407               0 :     }
     408                 : 
     409               0 :     void freeInCompartment(size_t nbytes) {
     410               0 :         JS_ASSERT(gcMallocAndFreeBytes >= nbytes);
     411               0 :         gcMallocAndFreeBytes -= nbytes;
     412               0 :     }
     413                 : 
     414                 :     js::DtoaCache dtoaCache;
     415                 : 
     416                 :   private:
     417                 :     js::MathCache                *mathCache;
     418                 : 
     419                 :     js::MathCache *allocMathCache(JSContext *cx);
     420                 : 
     421                 :     /*
     422                 :      * Weak reference to each global in this compartment that is a debuggee.
     423                 :      * Each global has its own list of debuggers.
     424                 :      */
     425                 :     js::GlobalObjectSet              debuggees;
     426                 : 
     427                 :   private:
     428           41285 :     JSCompartment *thisForCtor() { return this; }
     429                 : 
     430                 :   public:
     431         2850876 :     js::MathCache *getMathCache(JSContext *cx) {
     432         2850876 :         return mathCache ? mathCache : allocMathCache(cx);
     433                 :     }
     434                 : 
     435                 :     /*
     436                 :      * There are dueling APIs for debug mode. It can be enabled or disabled via
     437                 :      * JS_SetDebugModeForCompartment. It is automatically enabled and disabled
     438                 :      * by Debugger objects. Therefore debugModeBits has the DebugFromC bit set
     439                 :      * if the C API wants debug mode and the DebugFromJS bit set if debuggees
     440                 :      * is non-empty.
     441                 :      */
     442        22530077 :     bool debugMode() const { return !!debugModeBits; }
     443                 : 
     444                 :     /* True if any scripts from this compartment are on the JS stack. */
     445                 :     bool hasScriptsOnStack();
     446                 : 
     447                 :   private:
     448                 :     /* This is called only when debugMode() has just toggled. */
     449                 :     void updateForDebugMode(js::FreeOp *fop);
     450                 : 
     451                 :   public:
     452        28456831 :     js::GlobalObjectSet &getDebuggees() { return debuggees; }
     453                 :     bool addDebuggee(JSContext *cx, js::GlobalObject *global);
     454                 :     void removeDebuggee(js::FreeOp *fop, js::GlobalObject *global,
     455                 :                         js::GlobalObjectSet::Enum *debuggeesEnum = NULL);
     456                 :     bool setDebugModeFromC(JSContext *cx, bool b);
     457                 : 
     458                 :     void clearBreakpointsIn(JSContext *cx, js::Debugger *dbg, JSObject *handler);
     459                 :     void clearTraps(JSContext *cx);
     460                 : 
     461                 :   private:
     462                 :     void sweepBreakpoints(js::FreeOp *fop);
     463                 : 
     464                 :   public:
     465                 :     js::WatchpointMap *watchpointMap;
     466                 : };
     467                 : 
     468                 : #define JS_PROPERTY_TREE(cx)    ((cx)->compartment->propertyTree)
     469                 : 
     470                 : namespace js {
     471                 : static inline MathCache *
     472         2850876 : GetMathCache(JSContext *cx)
     473                 : {
     474         2850876 :     return cx->compartment->getMathCache(cx);
     475                 : }
     476                 : }
     477                 : 
     478                 : inline void
     479        12139038 : JSContext::setCompartment(JSCompartment *compartment)
     480                 : {
     481        12139038 :     this->compartment = compartment;
     482        12139038 :     this->inferenceEnabled = compartment ? compartment->types.inferenceEnabled : false;
     483        12139038 : }
     484                 : 
     485                 : #ifdef _MSC_VER
     486                 : #pragma warning(pop)
     487                 : #endif
     488                 : 
     489                 : namespace js {
     490                 : 
     491                 : class PreserveCompartment {
     492                 :   protected:
     493                 :     JSContext *cx;
     494                 :   private:
     495                 :     JSCompartment *oldCompartment;
     496                 :     bool oldInferenceEnabled;
     497                 :     JS_DECL_USE_GUARD_OBJECT_NOTIFIER
     498                 :   public:
     499        11883986 :      PreserveCompartment(JSContext *cx JS_GUARD_OBJECT_NOTIFIER_PARAM) : cx(cx) {
     500        11883986 :         JS_GUARD_OBJECT_NOTIFIER_INIT;
     501        11883986 :         oldCompartment = cx->compartment;
     502        11883986 :         oldInferenceEnabled = cx->inferenceEnabled;
     503        11883986 :     }
     504                 : 
     505        23767972 :     ~PreserveCompartment() {
     506                 :         /* The old compartment may have been destroyed, so we can't use cx->setCompartment. */
     507        11883986 :         cx->compartment = oldCompartment;
     508        11883986 :         cx->inferenceEnabled = oldInferenceEnabled;
     509        11883986 :     }
     510                 : };
     511                 : 
     512        11883986 : class SwitchToCompartment : public PreserveCompartment {
     513                 :   public:
     514        11883986 :     SwitchToCompartment(JSContext *cx, JSCompartment *newCompartment
     515                 :                         JS_GUARD_OBJECT_NOTIFIER_PARAM)
     516        11883986 :         : PreserveCompartment(cx)
     517                 :     {
     518        11883986 :         JS_GUARD_OBJECT_NOTIFIER_INIT;
     519        11883986 :         cx->setCompartment(newCompartment);
     520        11883986 :     }
     521                 : 
     522                 :     SwitchToCompartment(JSContext *cx, JSObject *target JS_GUARD_OBJECT_NOTIFIER_PARAM)
     523                 :         : PreserveCompartment(cx)
     524                 :     {
     525                 :         JS_GUARD_OBJECT_NOTIFIER_INIT;
     526                 :         cx->setCompartment(target->compartment());
     527                 :     }
     528                 : 
     529                 :     JS_DECL_USE_GUARD_OBJECT_NOTIFIER
     530                 : };
     531                 : 
     532                 : class AssertCompartmentUnchanged {
     533                 :   protected:
     534                 :     JSContext * const cx;
     535                 :     JSCompartment * const oldCompartment;
     536                 :     JS_DECL_USE_GUARD_OBJECT_NOTIFIER
     537                 :   public:
     538         1189174 :      AssertCompartmentUnchanged(JSContext *cx JS_GUARD_OBJECT_NOTIFIER_PARAM)
     539         1189174 :      : cx(cx), oldCompartment(cx->compartment) {
     540         1189174 :         JS_GUARD_OBJECT_NOTIFIER_INIT;
     541         1189174 :     }
     542                 : 
     543         2378348 :     ~AssertCompartmentUnchanged() {
     544         1189174 :         JS_ASSERT(cx->compartment == oldCompartment);
     545         1189174 :     }
     546                 : };
     547                 : 
     548                 : class AutoCompartment
     549                 : {
     550                 :   public:
     551                 :     JSContext * const context;
     552                 :     JSCompartment * const origin;
     553                 :     JSObject * const target;
     554                 :     JSCompartment * const destination;
     555                 :   private:
     556                 :     Maybe<DummyFrameGuard> frame;
     557                 :     bool entered;
     558                 : 
     559                 :   public:
     560                 :     AutoCompartment(JSContext *cx, JSObject *target);
     561                 :     ~AutoCompartment();
     562                 : 
     563                 :     bool enter();
     564                 :     void leave();
     565                 : 
     566                 :   private:
     567                 :     AutoCompartment(const AutoCompartment &) MOZ_DELETE;
     568                 :     AutoCompartment & operator=(const AutoCompartment &) MOZ_DELETE;
     569                 : };
     570                 : 
     571                 : /*
     572                 :  * Use this to change the behavior of an AutoCompartment slightly on error. If
     573                 :  * the exception happens to be an Error object, copy it to the origin compartment
     574                 :  * instead of wrapping it.
     575                 :  */
     576                 : class ErrorCopier
     577                 : {
     578                 :     AutoCompartment &ac;
     579                 :     JSObject *scope;
     580                 : 
     581                 :   public:
     582            9981 :     ErrorCopier(AutoCompartment &ac, JSObject *scope) : ac(ac), scope(scope) {
     583            9981 :         JS_ASSERT(scope->compartment() == ac.origin);
     584            9981 :     }
     585                 :     ~ErrorCopier();
     586                 : };
     587                 : 
     588                 : class CompartmentsIter {
     589                 :   private:
     590                 :     JSCompartment **it, **end;
     591                 : 
     592                 :   public:
     593          745252 :     CompartmentsIter(JSRuntime *rt) {
     594          745252 :         it = rt->compartments.begin();
     595          745252 :         end = rt->compartments.end();
     596          745252 :     }
     597                 : 
     598         5772921 :     bool done() const { return it == end; }
     599                 : 
     600         1569153 :     void next() {
     601         1569153 :         JS_ASSERT(!done());
     602         1569153 :         it++;
     603         1569153 :     }
     604                 : 
     605         1889363 :     JSCompartment *get() const {
     606         1889363 :         JS_ASSERT(!done());
     607         1889363 :         return *it;
     608                 :     }
     609                 : 
     610           95544 :     operator JSCompartment *() const { return get(); }
     611         1775058 :     JSCompartment *operator->() const { return get(); }
     612                 : };
     613                 : 
     614                 : } /* namespace js */
     615                 : 
     616                 : #endif /* jscompartment_h___ */

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