LCOV - code coverage report
Current view: directory - js/src - jscntxtinlines.h (source / functions) Found Hit Coverage
Test: app.info Lines: 199 178 89.4 %
Date: 2012-06-02 Functions: 70 64 91.4 %

       1                 : /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
       2                 :  * vim: set ts=4 sw=4 et tw=78:
       3                 :  *
       4                 :  * ***** BEGIN LICENSE BLOCK *****
       5                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       6                 :  *
       7                 :  * The contents of this file are subject to the Mozilla Public License Version
       8                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       9                 :  * the License. You may obtain a copy of the License at
      10                 :  * http://www.mozilla.org/MPL/
      11                 :  *
      12                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      13                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      14                 :  * for the specific language governing rights and limitations under the
      15                 :  * License.
      16                 :  *
      17                 :  * The Original Code is SpiderMonkey code.
      18                 :  *
      19                 :  * The Initial Developer of the Original Code is
      20                 :  * Mozilla Corporation.
      21                 :  * Portions created by the Initial Developer are Copyright (C) 2010
      22                 :  * the Initial Developer. All Rights Reserved.
      23                 :  *
      24                 :  * Contributor(s):
      25                 :  *   Jeff Walden <jwalden+code@mit.edu> (original author)
      26                 :  *
      27                 :  * Alternatively, the contents of this file may be used under the terms of
      28                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      29                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      30                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      31                 :  * of those above. If you wish to allow use of your version of this file only
      32                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      33                 :  * use your version of this file under the terms of the MPL, indicate your
      34                 :  * decision by deleting the provisions above and replace them with the notice
      35                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      36                 :  * the provisions above, a recipient may use your version of this file under
      37                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      38                 :  *
      39                 :  * ***** END LICENSE BLOCK ***** */
      40                 : 
      41                 : #ifndef jscntxtinlines_h___
      42                 : #define jscntxtinlines_h___
      43                 : 
      44                 : #include "jscntxt.h"
      45                 : #include "jscompartment.h"
      46                 : #include "jsfriendapi.h"
      47                 : #include "jsinterp.h"
      48                 : #include "jsxml.h"
      49                 : #include "jsgc.h"
      50                 : 
      51                 : #include "frontend/ParseMaps.h"
      52                 : #include "vm/RegExpObject.h"
      53                 : 
      54                 : namespace js {
      55                 : 
      56                 : struct PreserveRegsGuard
      57                 : {
      58        13853110 :     PreserveRegsGuard(JSContext *cx, FrameRegs &regs)
      59        13853110 :       : prevContextRegs(cx->maybeRegs()), cx(cx), regs_(regs) {
      60        13853110 :         cx->stack.repointRegs(&regs_);
      61        13853110 :     }
      62        13853110 :     ~PreserveRegsGuard() {
      63        13853110 :         JS_ASSERT(cx->maybeRegs() == &regs_);
      64        13853110 :         *prevContextRegs = regs_;
      65        13853110 :         cx->stack.repointRegs(prevContextRegs);
      66        13853110 :     }
      67                 : 
      68                 :     FrameRegs *prevContextRegs;
      69                 : 
      70                 :   private:
      71                 :     JSContext *cx;
      72                 :     FrameRegs &regs_;
      73                 : };
      74                 : 
      75                 : static inline GlobalObject *
      76       912986923 : GetGlobalForScopeChain(JSContext *cx)
      77                 : {
      78       912986923 :     if (cx->hasfp())
      79       912958782 :         return &cx->fp()->scopeChain().global();
      80                 : 
      81           28141 :     JSObject *scope = JS_ObjectToInnerObject(cx, cx->globalObject);
      82           28141 :     if (!scope)
      83               0 :         return NULL;
      84           28141 :     return &scope->asGlobal();
      85                 : }
      86                 : 
      87                 : inline GSNCache *
      88        35139329 : GetGSNCache(JSContext *cx)
      89                 : {
      90        35139329 :     return &cx->runtime->gsnCache;
      91                 : }
      92                 : 
      93                 : class AutoNamespaceArray : protected AutoGCRooter {
      94                 :   public:
      95            1082 :     AutoNamespaceArray(JSContext *cx)
      96            1082 :         : AutoGCRooter(cx, NAMESPACES), context(cx) {
      97            1082 :         array.init();
      98            1082 :     }
      99                 : 
     100            2164 :     ~AutoNamespaceArray() {
     101            1082 :         array.finish(context);
     102            1082 :     }
     103                 : 
     104             234 :     uint32_t length() const { return array.length; }
     105                 : 
     106                 :   private:
     107                 :     JSContext *context;
     108                 :     friend void AutoGCRooter::trace(JSTracer *trc);
     109                 : 
     110                 :   public:
     111                 :     JSXMLArray<JSObject> array;
     112                 : };
     113                 : 
     114                 : template <typename T>
     115                 : class AutoPtr
     116                 : {
     117                 :     JSContext *cx;
     118                 :     T *value;
     119                 : 
     120                 :     AutoPtr(const AutoPtr &other) MOZ_DELETE;
     121                 : 
     122                 :   public:
     123          978344 :     explicit AutoPtr(JSContext *cx) : cx(cx), value(NULL) {}
     124          978344 :     ~AutoPtr() {
     125          978344 :         cx->delete_<T>(value);
     126          978344 :     }
     127                 : 
     128          978344 :     void operator=(T *ptr) { value = ptr; }
     129                 : 
     130                 :     typedef void ***** ConvertibleToBool;
     131          978344 :     operator ConvertibleToBool() const { return (ConvertibleToBool) value; }
     132                 : 
     133                 :     const T *operator->() const { return value; }
     134         7826752 :     T *operator->() { return value; }
     135                 : 
     136          978344 :     T *get() { return value; }
     137                 : };
     138                 : 
     139                 : #ifdef DEBUG
     140                 : class CompartmentChecker
     141                 : {
     142                 :     JSContext *context;
     143                 :     JSCompartment *compartment;
     144                 : 
     145                 :   public:
     146       914082901 :     explicit CompartmentChecker(JSContext *cx) : context(cx), compartment(cx->compartment) {
     147       914082901 :         check(cx->hasfp() ? JS_GetGlobalForScopeChain(cx) : cx->globalObject);
     148       914082901 :     }
     149                 : 
     150                 :     /*
     151                 :      * Set a breakpoint here (break js::CompartmentChecker::fail) to debug
     152                 :      * compartment mismatches.
     153                 :      */
     154               0 :     static void fail(JSCompartment *c1, JSCompartment *c2) {
     155               0 :         printf("*** Compartment mismatch %p vs. %p\n", (void *) c1, (void *) c2);
     156               0 :         JS_NOT_REACHED("compartment mismatched");
     157                 :     }
     158                 : 
     159                 :     /* Note: should only be used when neither c1 nor c2 may be the default compartment. */
     160                 :     static void check(JSCompartment *c1, JSCompartment *c2) {
     161                 :         JS_ASSERT(c1 != c1->rt->atomsCompartment);
     162                 :         JS_ASSERT(c2 != c2->rt->atomsCompartment);
     163                 :         if (c1 != c2)
     164                 :             fail(c1, c2);
     165                 :     }
     166                 : 
     167      1290192446 :     void check(JSCompartment *c) {
     168      1290192446 :         if (c && c != context->runtime->atomsCompartment) {
     169      1290192446 :             if (!compartment)
     170               0 :                 compartment = c;
     171      1290192446 :             else if (c != compartment)
     172               0 :                 fail(compartment, c);
     173                 :         }
     174      1290192446 :     }
     175                 : 
     176           53468 :     void check(JSPrincipals *) { /* nothing for now */ }
     177                 : 
     178      1305787984 :     void check(JSObject *obj) {
     179      1305787984 :         if (obj)
     180      1268384670 :             check(obj->compartment());
     181      1305787984 :     }
     182                 : 
     183        56616588 :     void check(JSString *str) {
     184        56616588 :         if (!str->isAtom())
     185        21751540 :             check(str->compartment());
     186        56616588 :     }
     187                 : 
     188       941648262 :     void check(const js::Value &v) {
     189       941648262 :         if (v.isObject())
     190       277187169 :             check(&v.toObject());
     191       664461093 :         else if (v.isString())
     192        54195762 :             check(v.toString());
     193       941648262 :     }
     194                 : 
     195                 :     void check(const ValueArray &arr) {
     196                 :         for (size_t i = 0; i < arr.length; i++)
     197                 :             check(arr.array[i]);
     198                 :     }
     199                 : 
     200          741146 :     void check(const JSValueArray &arr) {
     201         1683383 :         for (size_t i = 0; i < arr.length; i++)
     202          942237 :             check(arr.array[i]);
     203          741146 :     }
     204                 : 
     205        24342607 :     void check(const CallArgs &args) {
     206       107931812 :         for (Value *p = args.base(); p != args.end(); ++p)
     207        83589205 :             check(*p);
     208        24342607 :     }
     209                 : 
     210        32030143 :     void check(jsid id) {
     211        32030143 :         if (JSID_IS_OBJECT(id))
     212              27 :             check(JSID_TO_OBJECT(id));
     213        32030143 :     }
     214                 :     
     215               0 :     void check(JSIdArray *ida) {
     216               0 :         if (ida) {
     217               0 :             for (int i = 0; i < ida->length; i++) {
     218               0 :                 if (JSID_IS_OBJECT(ida->vector[i]))
     219               0 :                     check(ida->vector[i]);
     220                 :             }
     221                 :         }
     222               0 :     }
     223                 : 
     224           56236 :     void check(JSScript *script) {
     225           56236 :         if (script) {
     226           56236 :             check(script->compartment());
     227           56236 :             if (!script->isCachedEval && script->globalObject)
     228           55584 :                 check(script->globalObject);
     229                 :         }
     230           56236 :     }
     231                 : 
     232            4702 :     void check(StackFrame *fp) {
     233            4702 :         if (fp)
     234            4702 :             check(&fp->scopeChain());
     235            4702 :     }
     236                 : };
     237                 : 
     238                 : #endif
     239                 : 
     240                 : /*
     241                 :  * Don't perform these checks when called from a finalizer. The checking
     242                 :  * depends on other objects not having been swept yet.
     243                 :  */
     244                 : #define START_ASSERT_SAME_COMPARTMENT()                                       \
     245                 :     if (cx->runtime->gcRunning)                                               \
     246                 :         return;                                                               \
     247                 :     CompartmentChecker c(cx)
     248                 : 
     249                 : template <class T1> inline void
     250       865149181 : assertSameCompartment(JSContext *cx, T1 t1)
     251                 : {
     252                 : #ifdef DEBUG
     253       865149181 :     START_ASSERT_SAME_COMPARTMENT();
     254       865149181 :     c.check(t1);
     255                 : #endif
     256                 : }
     257                 : 
     258                 : template <class T1, class T2> inline void
     259        19934680 : assertSameCompartment(JSContext *cx, T1 t1, T2 t2)
     260                 : {
     261                 : #ifdef DEBUG
     262        19934680 :     START_ASSERT_SAME_COMPARTMENT();
     263        19934680 :     c.check(t1);
     264        19934680 :     c.check(t2);
     265                 : #endif
     266                 : }
     267                 : 
     268                 : template <class T1, class T2, class T3> inline void
     269         9395096 : assertSameCompartment(JSContext *cx, T1 t1, T2 t2, T3 t3)
     270                 : {
     271                 : #ifdef DEBUG
     272         9395096 :     START_ASSERT_SAME_COMPARTMENT();
     273         9395096 :     c.check(t1);
     274         9395096 :     c.check(t2);
     275         9395096 :     c.check(t3);
     276                 : #endif
     277                 : }
     278                 : 
     279                 : template <class T1, class T2, class T3, class T4> inline void
     280                 : assertSameCompartment(JSContext *cx, T1 t1, T2 t2, T3 t3, T4 t4)
     281                 : {
     282                 : #ifdef DEBUG
     283                 :     START_ASSERT_SAME_COMPARTMENT();
     284                 :     c.check(t1);
     285                 :     c.check(t2);
     286                 :     c.check(t3);
     287                 :     c.check(t4);
     288                 : #endif
     289                 : }
     290                 : 
     291                 : template <class T1, class T2, class T3, class T4, class T5> inline void
     292        19603944 : assertSameCompartment(JSContext *cx, T1 t1, T2 t2, T3 t3, T4 t4, T5 t5)
     293                 : {
     294                 : #ifdef DEBUG
     295        19603944 :     START_ASSERT_SAME_COMPARTMENT();
     296        19603944 :     c.check(t1);
     297        19603944 :     c.check(t2);
     298        19603944 :     c.check(t3);
     299        19603944 :     c.check(t4);
     300        19603944 :     c.check(t5);
     301                 : #endif
     302                 : }
     303                 : 
     304                 : #undef START_ASSERT_SAME_COMPARTMENT
     305                 : 
     306                 : STATIC_PRECONDITION_ASSUME(ubound(args.argv_) >= argc)
     307                 : JS_ALWAYS_INLINE bool
     308        24342607 : CallJSNative(JSContext *cx, Native native, const CallArgs &args)
     309                 : {
     310                 : #ifdef DEBUG
     311        24342607 :     JSBool alreadyThrowing = cx->isExceptionPending();
     312                 : #endif
     313        24342607 :     assertSameCompartment(cx, args);
     314        24342607 :     bool ok = native(cx, args.length(), args.base());
     315        24342607 :     if (ok) {
     316        24259609 :         assertSameCompartment(cx, args.rval());
     317        24259609 :         JS_ASSERT_IF(!alreadyThrowing, !cx->isExceptionPending());
     318                 :     }
     319        24342607 :     return ok;
     320                 : }
     321                 : 
     322                 : extern JSBool CallOrConstructBoundFunction(JSContext *, unsigned, js::Value *);
     323                 : 
     324                 : STATIC_PRECONDITION(ubound(args.argv_) >= argc)
     325                 : JS_ALWAYS_INLINE bool
     326          265922 : CallJSNativeConstructor(JSContext *cx, Native native, const CallArgs &args)
     327                 : {
     328                 : #ifdef DEBUG
     329          265922 :     JSObject &callee = args.callee();
     330                 : #endif
     331                 : 
     332          265922 :     JS_ASSERT(args.thisv().isMagic());
     333          265922 :     if (!CallJSNative(cx, native, args))
     334             443 :         return false;
     335                 : 
     336                 :     /*
     337                 :      * Native constructors must return non-primitive values on success.
     338                 :      * Although it is legal, if a constructor returns the callee, there is a
     339                 :      * 99.9999% chance it is a bug. If any valid code actually wants the
     340                 :      * constructor to return the callee, the assertion can be removed or
     341                 :      * (another) conjunct can be added to the antecedent.
     342                 :      *
     343                 :      * Proxies are exceptions to both rules: they can return primitives and
     344                 :      * they allow content to return the callee.
     345                 :      *
     346                 :      * CallOrConstructBoundFunction is an exception as well because we
     347                 :      * might have used bind on a proxy function.
     348                 :      *
     349                 :      * (new Object(Object)) returns the callee.
     350                 :      */
     351         1006907 :     JS_ASSERT_IF(native != FunctionProxyClass.construct &&
     352                 :                  native != CallableObjectClass.construct &&
     353                 :                  native != js::CallOrConstructBoundFunction &&
     354                 :                  (!callee.isFunction() || callee.toFunction()->u.n.clasp != &ObjectClass),
     355         1272386 :                  !args.rval().isPrimitive() && callee != args.rval().toObject());
     356                 : 
     357          265479 :     return true;
     358                 : }
     359                 : 
     360                 : JS_ALWAYS_INLINE bool
     361         8584431 : CallJSPropertyOp(JSContext *cx, PropertyOp op, JSObject *receiver, jsid id, Value *vp)
     362                 : {
     363         8584431 :     assertSameCompartment(cx, receiver, id, *vp);
     364         8584431 :     JSBool ok = op(cx, receiver, id, vp);
     365         8584431 :     if (ok)
     366         8584381 :         assertSameCompartment(cx, receiver, *vp);
     367         8584431 :     return ok;
     368                 : }
     369                 : 
     370                 : JS_ALWAYS_INLINE bool
     371          202824 : CallJSPropertyOpSetter(JSContext *cx, StrictPropertyOp op, JSObject *obj, jsid id,
     372                 :                        JSBool strict, Value *vp)
     373                 : {
     374          202824 :     assertSameCompartment(cx, obj, id, *vp);
     375          202824 :     return op(cx, obj, id, strict, vp);
     376                 : }
     377                 : 
     378                 : inline bool
     379               0 : CallSetter(JSContext *cx, JSObject *obj, jsid id, StrictPropertyOp op, unsigned attrs,
     380                 :            unsigned shortid, JSBool strict, Value *vp)
     381                 : {
     382               0 :     if (attrs & JSPROP_SETTER)
     383               0 :         return InvokeGetterOrSetter(cx, obj, CastAsObjectJsval(op), 1, vp, vp);
     384                 : 
     385               0 :     if (attrs & JSPROP_GETTER)
     386               0 :         return js_ReportGetterOnlyAssignment(cx);
     387                 : 
     388               0 :     if (attrs & JSPROP_SHORTID)
     389               0 :         id = INT_TO_JSID(shortid);
     390               0 :     return CallJSPropertyOpSetter(cx, op, obj, id, strict, vp);
     391                 : }
     392                 : 
     393                 : static inline JSAtom **
     394        24597319 : FrameAtomBase(JSContext *cx, js::StackFrame *fp)
     395                 : {
     396        24597319 :     return fp->script()->atoms;
     397                 : }
     398                 : 
     399                 : }  /* namespace js */
     400                 : 
     401                 : inline JSVersion
     402         5282192 : JSContext::findVersion() const
     403                 : {
     404         5282192 :     if (hasVersionOverride)
     405             148 :         return versionOverride;
     406                 : 
     407         5282044 :     if (stack.hasfp()) {
     408                 :         /* There may be a scripted function somewhere on the stack! */
     409         4045644 :         js::StackFrame *f = fp();
     410         8106138 :         while (f && !f->isScriptFrame())
     411           14850 :             f = f->prev();
     412         4045644 :         if (f)
     413         4045235 :             return f->script()->getVersion();
     414                 :     }
     415                 : 
     416         1236809 :     return defaultVersion;
     417                 : }
     418                 : 
     419                 : inline bool
     420           25862 : JSContext::canSetDefaultVersion() const
     421                 : {
     422           25862 :     return !stack.hasfp() && !hasVersionOverride;
     423                 : }
     424                 : 
     425                 : inline void
     426              61 : JSContext::overrideVersion(JSVersion newVersion)
     427                 : {
     428              61 :     JS_ASSERT(!canSetDefaultVersion());
     429              61 :     versionOverride = newVersion;
     430              61 :     hasVersionOverride = true;
     431              61 : }
     432                 : 
     433                 : inline bool
     434           25801 : JSContext::maybeOverrideVersion(JSVersion newVersion)
     435                 : {
     436           25801 :     if (canSetDefaultVersion()) {
     437           25741 :         setDefaultVersion(newVersion);
     438           25741 :         return false;
     439                 :     }
     440              60 :     overrideVersion(newVersion);
     441              60 :     return true;
     442                 : }
     443                 : 
     444                 : inline unsigned
     445         5011016 : JSContext::getCompileOptions() const { return js::VersionFlagsToOptions(findVersion()); }
     446                 : 
     447                 : inline unsigned
     448         3583334 : JSContext::allOptions() const { return getRunOptions() | getCompileOptions(); }
     449                 : 
     450                 : inline void
     451         1329240 : JSContext::setCompileOptions(unsigned newcopts)
     452                 : {
     453         1329240 :     JS_ASSERT((newcopts & JSCOMPILEOPTION_MASK) == newcopts);
     454         1329240 :     if (JS_LIKELY(getCompileOptions() == newcopts))
     455         1328272 :         return;
     456             968 :     JSVersion version = findVersion();
     457             968 :     JSVersion newVersion = js::OptionFlagsToVersion(newcopts, version);
     458             968 :     maybeOverrideVersion(newVersion);
     459                 : }
     460                 : 
     461                 : inline void
     462                 : JSContext::assertValidStackDepth(unsigned depth)
     463                 : {
     464                 : #ifdef DEBUG
     465                 :     JS_ASSERT(0 <= regs().sp - fp()->base());
     466                 :     JS_ASSERT(depth <= uintptr_t(regs().sp - fp()->base()));
     467                 : #endif
     468                 : }
     469                 : 
     470                 : #ifdef JS_METHODJIT
     471             202 : inline js::mjit::JaegerCompartment *JSContext::jaegerCompartment()
     472                 : {
     473             202 :     return compartment->jaegerCompartment();
     474                 : }
     475                 : #endif
     476                 : 
     477                 : inline js::LifoAlloc &
     478        11813112 : JSContext::typeLifoAlloc()
     479                 : {
     480        11813112 :     return compartment->typeLifoAlloc;
     481                 : }
     482                 : 
     483                 : inline bool
     484           30834 : JSContext::ensureGeneratorStackSpace()
     485                 : {
     486           30834 :     bool ok = genStack.reserve(genStack.length() + 1);
     487           30834 :     if (!ok)
     488               0 :         js_ReportOutOfMemory(this);
     489           30834 :     return ok;
     490                 : }
     491                 : 
     492                 : inline void
     493          138391 : JSContext::setPendingException(js::Value v) {
     494          138391 :     this->throwing = true;
     495          138391 :     this->exception = v;
     496          138391 :     js::assertSameCompartment(this, v);
     497          138391 : }
     498                 : 
     499                 : inline bool
     500          134271 : JSContext::ensureParseMapPool()
     501                 : {
     502          134271 :     if (parseMapPool_)
     503          111773 :         return true;
     504           22498 :     parseMapPool_ = js::OffTheBooks::new_<js::ParseMapPool>(this);
     505           22498 :     return parseMapPool_;
     506                 : }
     507                 : 
     508                 : /* Get the current frame, first lazily instantiating stack frames if needed. */
     509                 : static inline js::StackFrame *
     510         3552954 : js_GetTopStackFrame(JSContext *cx, FrameExpandKind expand)
     511                 : {
     512                 : #ifdef JS_METHODJIT
     513         3552954 :     if (expand)
     514         3551012 :         js::mjit::ExpandInlineFrames(cx->compartment);
     515                 : #endif
     516                 : 
     517         3552954 :     return cx->maybefp();
     518                 : }
     519                 : 
     520                 : #endif /* jscntxtinlines_h___ */

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