/[jscoverage]/trunk/js/jscntxt.h
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Diff of /trunk/js/jscntxt.h

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revision 459 by siliconforks, Tue Dec 9 03:37:47 2008 UTC revision 460 by siliconforks, Sat Sep 26 23:15:22 2009 UTC
# Line 72  Line 72 
72      uint32          hits;      uint32          hits;
73      uint32          misses;      uint32          misses;
74      uint32          fills;      uint32          fills;
75      uint32          clears;      uint32          purges;
76  # define GSN_CACHE_METER(cache,cnt) (++(cache)->cnt)  # define GSN_CACHE_METER(cache,cnt) (++(cache)->cnt)
77  #else  #else
78  # define GSN_CACHE_METER(cache,cnt) /* nothing */  # define GSN_CACHE_METER(cache,cnt) /* nothing */
79  #endif  #endif
80  } JSGSNCache;  } JSGSNCache;
81    
82  #define GSN_CACHE_CLEAR(cache)                                                \  #define js_FinishGSNCache(cache) js_PurgeGSNCache(cache)
83      JS_BEGIN_MACRO                                                            \  
84          (cache)->code = NULL;                                                 \  extern void
85          if ((cache)->table.ops) {                                             \  js_PurgeGSNCache(JSGSNCache *cache);
             JS_DHashTableFinish(&(cache)->table);                             \  
             (cache)->table.ops = NULL;                                        \  
         }                                                                     \  
         GSN_CACHE_METER(cache, clears);                                       \  
     JS_END_MACRO  
86    
87  /* These helper macros take a cx as parameter and operate on its GSN cache. */  /* These helper macros take a cx as parameter and operate on its GSN cache. */
88  #define JS_CLEAR_GSN_CACHE(cx)      GSN_CACHE_CLEAR(&JS_GSN_CACHE(cx))  #define JS_PURGE_GSN_CACHE(cx)      js_PurgeGSNCache(&JS_GSN_CACHE(cx))
89  #define JS_METER_GSN_CACHE(cx,cnt)  GSN_CACHE_METER(&JS_GSN_CACHE(cx), cnt)  #define JS_METER_GSN_CACHE(cx,cnt)  GSN_CACHE_METER(&JS_GSN_CACHE(cx), cnt)
90    
91    typedef struct InterpState InterpState;
92    typedef struct VMSideExit VMSideExit;
93    
94  #ifdef __cplusplus  #ifdef __cplusplus
95  namespace nanojit {  namespace nanojit {
96      class Fragment;      class Fragment;
97      class Fragmento;      class Fragmento;
98        class LirBuffer;
99  }  }
100  class TraceRecorder;  class TraceRecorder;
101  extern "C++" { template<typename T> class Queue; }  extern "C++" { template<typename T> class Queue; }
102  typedef Queue<uint16> SlotList;  typedef Queue<uint16> SlotList;
 class TypeMap;  
103    
104  # define CLS(T)  T*  # define CLS(T)  T*
105  #else  #else
106  # define CLS(T)  void*  # define CLS(T)  void*
107  #endif  #endif
108    
109    #define FRAGMENT_TABLE_SIZE 512
110    struct VMFragment;
111    
112    #define MONITOR_N_GLOBAL_STATES 4
113    struct GlobalState {
114        JSObject*               globalObj;
115        uint32                  globalShape;
116        CLS(SlotList)           globalSlots;
117    };
118    
119  /*  /*
120   * Trace monitor. Every JSThread (if JS_THREADSAFE) or JSRuntime (if not   * Trace monitor. Every JSThread (if JS_THREADSAFE) or JSRuntime (if not
121   * JS_THREADSAFE) has an associated trace monitor that keeps track of loop   * JS_THREADSAFE) has an associated trace monitor that keeps track of loop
122   * frequencies for all JavaScript code loaded into that runtime.   * frequencies for all JavaScript code loaded into that runtime.
123   */   */
124  typedef struct JSTraceMonitor {  struct JSTraceMonitor {
125      /*      /*
126       * Flag set when running (or recording) JIT-compiled code. This prevents       * The context currently executing JIT-compiled code on this thread, or
127       * both interpreter activation and last-ditch garbage collection when up       * NULL if none. Among other things, this can in certain cases prevent
128       * against our runtime's memory limits. This flag also suppresses calls to       * last-ditch GC and suppress calls to JS_ReportOutOfMemory.
129       * JS_ReportOutOfMemory when failing due to runtime limits.       *
130         * !tracecx && !recorder: not on trace
131         * !tracecx && !recorder && prohibitFlush: deep-bailed
132         * !tracecx && recorder && !recorder->deepAborted: recording
133         * !tracecx && recorder && recorder->deepAborted: deep aborted
134         * tracecx && !recorder: executing a trace
135         * tracecx && recorder: executing inner loop, recording outer loop
136       */       */
137      JSBool                  onTrace;      JSContext               *tracecx;
138    
139        CLS(nanojit::LirBuffer) lirbuf;
140      CLS(nanojit::Fragmento) fragmento;      CLS(nanojit::Fragmento) fragmento;
141      CLS(TraceRecorder)      recorder;      CLS(TraceRecorder)      recorder;
142      uint32                  globalShape;      jsval                   *reservedDoublePool;
143      CLS(SlotList)           globalSlots;      jsval                   *reservedDoublePoolPtr;
144      CLS(TypeMap)            globalTypeMap;  
145      jsval                   *recoveryDoublePool;      struct GlobalState      globalStates[MONITOR_N_GLOBAL_STATES];
146      jsval                   *recoveryDoublePoolPtr;      struct VMFragment*      vmfragments[FRAGMENT_TABLE_SIZE];
147        JSDHashTable            recordAttempts;
148    
149        /*
150         * Maximum size of the code cache before we start flushing. 1/16 of this
151         * size is used as threshold for the regular expression code cache.
152         */
153        uint32                  maxCodeCacheBytes;
154    
155        /*
156         * If nonzero, do not flush the JIT cache after a deep bail. That would
157         * free JITted code pages that we will later return to. Instead, set the
158         * needFlush flag so that it can be flushed later.
159         *
160         * NB: needFlush and useReservedObjects are packed together.
161         */
162        uintN                   prohibitFlush;
163        JSPackedBool            needFlush;
164    
165        /*
166         * reservedObjects is a linked list (via fslots[0]) of preallocated JSObjects.
167         * The JIT uses this to ensure that leaving a trace tree can't fail.
168         */
169        JSPackedBool            useReservedObjects;
170        JSObject                *reservedObjects;
171    
172      /* Fragmento for the regular expression compiler. This is logically      /* Fragmento for the regular expression compiler. This is logically
173       * a distinct compiler but needs to be managed in exactly the same       * a distinct compiler but needs to be managed in exactly the same
174       * way as the real tracing Fragmento. */       * way as the real tracing Fragmento. */
175        CLS(nanojit::LirBuffer) reLirBuf;
176      CLS(nanojit::Fragmento) reFragmento;      CLS(nanojit::Fragmento) reFragmento;
177    
178      /* Keep a list of recorders we need to abort on cache flush. */      /* Keep a list of recorders we need to abort on cache flush. */
179      CLS(TraceRecorder)      abortStack;      CLS(TraceRecorder)      abortStack;
180  } JSTraceMonitor;  };
181    
182    typedef struct InterpStruct InterpStruct;
183    
184    /*
185     * N.B. JS_ON_TRACE(cx) is true if JIT code is on the stack in the current
186     * thread, regardless of whether cx is the context in which that trace is
187     * executing.  cx must be a context on the current thread.
188     */
189  #ifdef JS_TRACER  #ifdef JS_TRACER
190  # define JS_ON_TRACE(cx)   (JS_TRACE_MONITOR(cx).onTrace)  # define JS_ON_TRACE(cx)            (JS_TRACE_MONITOR(cx).tracecx != NULL)
191  #else  #else
192  # define JS_ON_TRACE(cx)   JS_FALSE  # define JS_ON_TRACE(cx)            JS_FALSE
193    #endif
194    
195    #ifdef DEBUG
196    # define JS_EVAL_CACHE_METERING     1
197    # define JS_FUNCTION_METERING       1
198    #endif
199    
200    /* Number of potentially reusable scriptsToGC to search for the eval cache. */
201    #ifndef JS_EVAL_CACHE_SHIFT
202    # define JS_EVAL_CACHE_SHIFT        6
203    #endif
204    #define JS_EVAL_CACHE_SIZE          JS_BIT(JS_EVAL_CACHE_SHIFT)
205    
206    #ifdef JS_EVAL_CACHE_METERING
207    # define EVAL_CACHE_METER_LIST(_)   _(probe), _(hit), _(step), _(noscope)
208    # define identity(x)                x
209    
210    /* Have to typedef this for LiveConnect C code, which includes us. */
211    typedef struct JSEvalCacheMeter {
212        uint64 EVAL_CACHE_METER_LIST(identity);
213    } JSEvalCacheMeter;
214    
215    # undef identity
216    #endif
217    
218    #ifdef JS_FUNCTION_METERING
219    # define FUNCTION_KIND_METER_LIST(_)                                          \
220                            _(allfun), _(heavy), _(nofreeupvar), _(onlyfreevar),  \
221                            _(display), _(flat), _(setupvar), _(badfunarg)
222    # define identity(x)    x
223    
224    typedef struct JSFunctionMeter {
225        int32 FUNCTION_KIND_METER_LIST(identity);
226    } JSFunctionMeter;
227    
228    # undef identity
229    #endif
230    
231    struct JSThreadData {
232        /*
233         * The GSN cache is per thread since even multi-cx-per-thread embeddings
234         * do not interleave js_GetSrcNote calls.
235         */
236        JSGSNCache          gsnCache;
237    
238        /* Property cache for faster call/get/set invocation. */
239        JSPropertyCache     propertyCache;
240    
241    #ifdef JS_TRACER
242        /* Trace-tree JIT recorder/interpreter state. */
243        JSTraceMonitor      traceMonitor;
244  #endif  #endif
245    
246        /* Lock-free hashed lists of scripts created by eval to garbage-collect. */
247        JSScript            *scriptsToGC[JS_EVAL_CACHE_SIZE];
248    
249    #ifdef JS_EVAL_CACHE_METERING
250        JSEvalCacheMeter    evalCacheMeter;
251    #endif
252    };
253    
254  #ifdef JS_THREADSAFE  #ifdef JS_THREADSAFE
255    
256  /*  /*
# Line 151  Line 258 
258   * that can be accessed without a global lock.   * that can be accessed without a global lock.
259   */   */
260  struct JSThread {  struct JSThread {
261      /* Linked list of all contexts active on this thread. */      /* Linked list of all contexts in use on this thread. */
262      JSCList             contextList;      JSCList             contextList;
263    
264      /* Opaque thread-id, from NSPR's PR_GetCurrentThread(). */      /* Opaque thread-id, from NSPR's PR_GetCurrentThread(). */
# Line 163  Line 270 
270       */       */
271      uint32              gcMallocBytes;      uint32              gcMallocBytes;
272    
273      /*      /* Indicates that the thread is waiting in ClaimTitle from jslock.cpp. */
274       * Store the GSN cache in struct JSThread, not struct JSContext, both to      JSTitle             *titleToShare;
      * save space and to simplify cleanup in js_GC.  Any embedding (Firefox  
      * or another Gecko application) that uses many contexts per thread is  
      * unlikely to interleave js_GetSrcNote-intensive loops in the decompiler  
      * among two or more contexts running script in one thread.  
      */  
     JSGSNCache          gsnCache;  
   
     /* Property cache for faster call/get/set invocation. */  
     JSPropertyCache     propertyCache;  
275    
276      /* Trace-tree JIT recorder/interpreter state. */      /* Factored out of JSThread for !JS_THREADSAFE embedding in JSRuntime. */
277      JSTraceMonitor      traceMonitor;      JSThreadData        data;
   
     /* Lock-free list of scripts created by eval to garbage-collect. */  
     JSScript            *scriptsToGC;  
278  };  };
279    
280  #define JS_GSN_CACHE(cx)        ((cx)->thread->gsnCache)  #define JS_THREAD_DATA(cx)      (&(cx)->thread->data)
 #define JS_PROPERTY_CACHE(cx)   ((cx)->thread->propertyCache)  
 #define JS_TRACE_MONITOR(cx)    ((cx)->thread->traceMonitor)  
 #define JS_SCRIPTS_TO_GC(cx)    ((cx)->thread->scriptsToGC)  
281    
282  extern void  struct JSThreadsHashEntry {
283  js_ThreadDestructorCB(void *ptr);      JSDHashEntryHdr     base;
284        JSThread            *thread;
285    };
286    
287    /*
288     * The function takes the GC lock and does not release in successful return.
289     * On error (out of memory) the function releases the lock but delegates
290     * the error reporting to the caller.
291     */
292  extern JSBool  extern JSBool
293  js_SetContextThread(JSContext *cx);  js_InitContextThread(JSContext *cx);
294    
295    /*
296     * On entrance the GC lock must be held and it will be held on exit.
297     */
298  extern void  extern void
299  js_ClearContextThread(JSContext *cx);  js_ClearContextThread(JSContext *cx);
300    
 extern JSThread *  
 js_GetCurrentThread(JSRuntime *rt);  
   
301  #endif /* JS_THREADSAFE */  #endif /* JS_THREADSAFE */
302    
303  typedef enum JSDestroyContextMode {  typedef enum JSDestroyContextMode {
# Line 215  Line 314 
314      JSRTS_LANDING      JSRTS_LANDING
315  } JSRuntimeState;  } JSRuntimeState;
316    
317    typedef enum JSBuiltinFunctionId {
318        JSBUILTIN_ObjectToIterator,
319        JSBUILTIN_CallIteratorNext,
320        JSBUILTIN_GetProperty,
321        JSBUILTIN_GetElement,
322        JSBUILTIN_SetProperty,
323        JSBUILTIN_SetElement,
324        JSBUILTIN_LIMIT
325    } JSBuiltinFunctionId;
326    
327  typedef struct JSPropertyTreeEntry {  typedef struct JSPropertyTreeEntry {
328      JSDHashEntryHdr     hdr;      JSDHashEntryHdr     hdr;
329      JSScopeProperty     *child;      JSScopeProperty     *child;
# Line 226  Line 335 
335      JSObject            *obj;           /* object containing slot to set */      JSObject            *obj;           /* object containing slot to set */
336      JSObject            *pobj;          /* new proto or parent reference */      JSObject            *pobj;          /* new proto or parent reference */
337      uint16              slot;           /* which to set, proto or parent */      uint16              slot;           /* which to set, proto or parent */
338      uint16              errnum;         /* JSMSG_NO_ERROR or error result */      JSPackedBool        cycle;          /* true if a cycle was detected */
339      JSSetSlotRequest    *next;          /* next request in GC worklist */      JSSetSlotRequest    *next;          /* next request in GC worklist */
340  };  };
341    
# Line 237  Line 346 
346      /* Context create/destroy callback. */      /* Context create/destroy callback. */
347      JSContextCallback   cxCallback;      JSContextCallback   cxCallback;
348    
349        /*
350         * Shape regenerated whenever a prototype implicated by an "add property"
351         * property cache fill and induced trace guard has a readonly property or a
352         * setter defined on it. This number proxies for the shapes of all objects
353         * along the prototype chain of all objects in the runtime on which such an
354         * add-property result has been cached/traced.
355         *
356         * See bug 492355 for more details.
357         *
358         * This comes early in JSRuntime to minimize the immediate format used by
359         * trace-JITted code that reads it.
360         */
361        uint32              protoHazardShape;
362    
363      /* Garbage collector state, used by jsgc.c. */      /* Garbage collector state, used by jsgc.c. */
364      JSGCChunkInfo       *gcChunkList;      JSGCChunkInfo       *gcChunkList;
365      JSGCArenaList       gcArenaList[GC_NUM_FREELISTS];      JSGCArenaList       gcArenaList[GC_NUM_FREELISTS];
# Line 253  Line 376 
376      uint32              gcLevel;      uint32              gcLevel;
377      uint32              gcNumber;      uint32              gcNumber;
378      JSTracer            *gcMarkingTracer;      JSTracer            *gcMarkingTracer;
379        uint32              gcTriggerFactor;
380        volatile JSBool     gcIsNeeded;
381    
382      /*      /*
383       * NB: do not pack another flag here by claiming gcPadding unless the new       * NB: do not pack another flag here by claiming gcPadding unless the new
# Line 323  Line 448 
448      JSString            *emptyString;      JSString            *emptyString;
449      JSString            **unitStrings;      JSString            **unitStrings;
450    
451        /*
452         * Builtin functions, lazily created and held for use by the trace recorder.
453         *
454         * This field would be #ifdef JS_TRACER, but XPConnect is compiled without
455         * -DJS_TRACER and includes this header.
456         */
457        JSObject            *builtinFunctions[JSBUILTIN_LIMIT];
458    
459      /* List of active contexts sharing this runtime; protected by gcLock. */      /* List of active contexts sharing this runtime; protected by gcLock. */
460      JSCList             contextList;      JSCList             contextList;
461    
# Line 382  Line 515 
515       * case too.       * case too.
516       */       */
517      PRLock              *debuggerLock;      PRLock              *debuggerLock;
518    
519        JSDHashTable        threads;
520  #endif /* JS_THREADSAFE */  #endif /* JS_THREADSAFE */
521      uint32              debuggerMutations;      uint32              debuggerMutations;
522    
# Line 431  Line 566 
566      JSNativeEnumerator  *nativeEnumerators;      JSNativeEnumerator  *nativeEnumerators;
567    
568  #ifndef JS_THREADSAFE  #ifndef JS_THREADSAFE
569      /*      JSThreadData        threadData;
      * For thread-unsafe embeddings, the GSN cache lives in the runtime and  
      * not each context, since we expect it to be filled once when decompiling  
      * a longer script, then hit repeatedly as js_GetSrcNote is called during  
      * the decompiler activation that filled it.  
      */  
     JSGSNCache          gsnCache;  
   
     /* Property cache for faster call/get/set invocation. */  
     JSPropertyCache     propertyCache;  
   
     /* Trace-tree JIT recorder/interpreter state. */  
     JSTraceMonitor      traceMonitor;  
   
     /* Lock-free list of scripts created by eval to garbage-collect. */  
     JSScript            *scriptsToGC;  
570    
571  #define JS_GSN_CACHE(cx)        ((cx)->runtime->gsnCache)  #define JS_THREAD_DATA(cx)      (&(cx)->runtime->threadData)
 #define JS_PROPERTY_CACHE(cx)   ((cx)->runtime->propertyCache)  
 #define JS_TRACE_MONITOR(cx)    ((cx)->runtime->traceMonitor)  
 #define JS_SCRIPTS_TO_GC(cx)    ((cx)->runtime->scriptsToGC)  
572  #endif  #endif
573    
574      /*      /*
575       * Object shape (property cache structural type) identifier generator.       * Object shape (property cache structural type) identifier generator.
576       *       *
577       * Type 0 stands for the empty scope, and must not be regenerated due to       * Type 0 stands for the empty scope, and must not be regenerated due to
578       * uint32 wrap-around. Since we use atomic pre-increment, the initial       * uint32 wrap-around. Since js_GenerateShape (in jsinterp.cpp) uses
579       * value for the first typed non-empty scope will be 1.       * atomic pre-increment, the initial value for the first typed non-empty
580         * scope will be 1.
581       *       *
      * The GC compresses live types, minimizing rt->shapeGen in the process.  
582       * If this counter overflows into SHAPE_OVERFLOW_BIT (in jsinterp.h), the       * If this counter overflows into SHAPE_OVERFLOW_BIT (in jsinterp.h), the
583       * GC will disable property caches for all threads, to avoid aliasing two       * cache is disabled, to avoid aliasing two different types. It stays
584       * different types. Updated by js_GenerateShape (in jsinterp.c).       * disabled until a triggered GC at some later moment compresses live
585         * types, minimizing rt->shapeGen in the process.
586       */       */
587      uint32              shapeGen;      volatile uint32     shapeGen;
588    
589      /* Literal table maintained by jsatom.c functions. */      /* Literal table maintained by jsatom.c functions. */
590      JSAtomState         atomState;      JSAtomState         atomState;
# Line 486  Line 604 
604      jsuword             nativeEnumCache[NATIVE_ENUM_CACHE_SIZE];      jsuword             nativeEnumCache[NATIVE_ENUM_CACHE_SIZE];
605    
606      /*      /*
      * Runtime-wide flag set to true when any Array prototype has an indexed  
      * property defined on it, creating a hazard for code reading or writing  
      * over a hole from a dense Array instance that is not prepared to look up  
      * the proto chain (the writing case must involve a check for a read-only  
      * element, which cannot be shadowed).  
      */  
     JSBool              anyArrayProtoHasElement;  
   
     /*  
607       * Various metering fields are defined at the end of JSRuntime. In this       * Various metering fields are defined at the end of JSRuntime. In this
608       * way there is no need to recompile all the code that refers to other       * way there is no need to recompile all the code that refers to other
609       * fields of JSRuntime after enabling the corresponding metering macro.       * fields of JSRuntime after enabling the corresponding metering macro.
# Line 567  Line 676 
676  #ifdef JS_GCMETER  #ifdef JS_GCMETER
677      JSGCStats           gcStats;      JSGCStats           gcStats;
678  #endif  #endif
679    
680    #ifdef JS_FUNCTION_METERING
681        JSFunctionMeter     functionMeter;
682        char                lastScriptFilename[1024];
683    #endif
684  };  };
685    
686    /* Common macros to access thread-local caches in JSThread or JSRuntime. */
687    #define JS_GSN_CACHE(cx)        (JS_THREAD_DATA(cx)->gsnCache)
688    #define JS_PROPERTY_CACHE(cx)   (JS_THREAD_DATA(cx)->propertyCache)
689    #define JS_TRACE_MONITOR(cx)    (JS_THREAD_DATA(cx)->traceMonitor)
690    #define JS_SCRIPTS_TO_GC(cx)    (JS_THREAD_DATA(cx)->scriptsToGC)
691    
692    #ifdef JS_EVAL_CACHE_METERING
693    # define EVAL_CACHE_METER(x)    (JS_THREAD_DATA(cx)->evalCacheMeter.x++)
694    #else
695    # define EVAL_CACHE_METER(x)    ((void) 0)
696    #endif
697    
698  #ifdef DEBUG  #ifdef DEBUG
699  # define JS_RUNTIME_METER(rt, which)    JS_ATOMIC_INCREMENT(&(rt)->which)  # define JS_RUNTIME_METER(rt, which)    JS_ATOMIC_INCREMENT(&(rt)->which)
700  # define JS_RUNTIME_UNMETER(rt, which)  JS_ATOMIC_DECREMENT(&(rt)->which)  # define JS_RUNTIME_UNMETER(rt, which)  JS_ATOMIC_DECREMENT(&(rt)->which)
# Line 662  Line 788 
788                                       * structure */                                       * structure */
789  #define JSTVU_SPROP         (-3)    /* u.sprop roots property tree node */  #define JSTVU_SPROP         (-3)    /* u.sprop roots property tree node */
790  #define JSTVU_WEAK_ROOTS    (-4)    /* u.weakRoots points to saved weak roots */  #define JSTVU_WEAK_ROOTS    (-4)    /* u.weakRoots points to saved weak roots */
791  #define JSTVU_PARSE_CONTEXT (-5)    /* u.parseContext roots JSParseContext* */  #define JSTVU_COMPILER      (-5)    /* u.compiler roots JSCompiler* */
792  #define JSTVU_SCRIPT        (-6)    /* u.script roots JSScript* */  #define JSTVU_SCRIPT        (-6)    /* u.script roots JSScript* */
793    
794  /*  /*
# Line 674  Line 800 
800   * bits. This is how, for example, js_GetGCThingTraceKind uses its |thing|   * bits. This is how, for example, js_GetGCThingTraceKind uses its |thing|
801   * parameter -- it consults GC-thing flags stored separately from the thing to   * parameter -- it consults GC-thing flags stored separately from the thing to
802   * decide the kind of thing.   * decide the kind of thing.
  *  
  * The following checks that this type-punning is possible.  
803   */   */
 JS_STATIC_ASSERT(sizeof(JSTempValueUnion) == sizeof(jsval));  
 JS_STATIC_ASSERT(sizeof(JSTempValueUnion) == sizeof(void *));  
   
804  #define JS_PUSH_TEMP_ROOT_COMMON(cx,x,tvr,cnt,kind)                           \  #define JS_PUSH_TEMP_ROOT_COMMON(cx,x,tvr,cnt,kind)                           \
805      JS_BEGIN_MACRO                                                            \      JS_BEGIN_MACRO                                                            \
806          JS_ASSERT((cx)->tempValueRooters != (tvr));                           \          JS_ASSERT((cx)->tempValueRooters != (tvr));                           \
# Line 722  Line 843 
843  #define JS_PUSH_TEMP_ROOT_WEAK_COPY(cx,weakRoots_,tvr)                        \  #define JS_PUSH_TEMP_ROOT_WEAK_COPY(cx,weakRoots_,tvr)                        \
844      JS_PUSH_TEMP_ROOT_COMMON(cx, weakRoots_, tvr, JSTVU_WEAK_ROOTS, weakRoots)      JS_PUSH_TEMP_ROOT_COMMON(cx, weakRoots_, tvr, JSTVU_WEAK_ROOTS, weakRoots)
845    
846  #define JS_PUSH_TEMP_ROOT_PARSE_CONTEXT(cx,pc,tvr)                            \  #define JS_PUSH_TEMP_ROOT_COMPILER(cx,pc,tvr)                                 \
847      JS_PUSH_TEMP_ROOT_COMMON(cx, pc, tvr, JSTVU_PARSE_CONTEXT, parseContext)      JS_PUSH_TEMP_ROOT_COMMON(cx, pc, tvr, JSTVU_COMPILER, compiler)
848    
849  #define JS_PUSH_TEMP_ROOT_SCRIPT(cx,script_,tvr)                              \  #define JS_PUSH_TEMP_ROOT_SCRIPT(cx,script_,tvr)                              \
850      JS_PUSH_TEMP_ROOT_COMMON(cx, script_, tvr, JSTVU_SCRIPT, script)      JS_PUSH_TEMP_ROOT_COMMON(cx, script_, tvr, JSTVU_SCRIPT, script)
# Line 732  Line 853 
853  #define JSRESOLVE_INFER         0xffff  /* infer bits from current bytecode */  #define JSRESOLVE_INFER         0xffff  /* infer bits from current bytecode */
854    
855  struct JSContext {  struct JSContext {
     /* JSRuntime contextList linkage. */  
     JSCList             links;  
   
856      /*      /*
857       * Operation count. It is declared early in the structure as a frequently       * If this flag is set, we were asked to call back the operation callback
858       * accessed field.       * as soon as possible.
859       */       */
860      int32               operationCount;      volatile jsint      operationCallbackFlag;
861    
862        /* JSRuntime contextList linkage. */
863        JSCList             link;
864    
865  #if JS_HAS_XML_SUPPORT  #if JS_HAS_XML_SUPPORT
866      /*      /*
# Line 757  Line 878 
878      /*      /*
879       * Classic Algol "display" static link optimization.       * Classic Algol "display" static link optimization.
880       */       */
881  #define JS_DISPLAY_SIZE 16  #define JS_DISPLAY_SIZE 16U
882    
883      JSStackFrame        *display[JS_DISPLAY_SIZE];      JSStackFrame        *display[JS_DISPLAY_SIZE];
884    
# Line 813  Line 934 
934      JSRuntime           *runtime;      JSRuntime           *runtime;
935    
936      /* Stack arena pool and frame pointer register. */      /* Stack arena pool and frame pointer register. */
937        JS_REQUIRES_STACK
938      JSArenaPool         stackPool;      JSArenaPool         stackPool;
939    
940        JS_REQUIRES_STACK
941      JSStackFrame        *fp;      JSStackFrame        *fp;
942    
943      /* Temporary arena pool used while compiling and decompiling. */      /* Temporary arena pool used while compiling and decompiling. */
# Line 838  Line 962 
962      char                *lastMessage;      char                *lastMessage;
963  #ifdef DEBUG  #ifdef DEBUG
964      void                *tracefp;      void                *tracefp;
965        jsbytecode          *tracePrevPc;
966  #endif  #endif
967    
968      /* Per-context optional error reporter. */      /* Per-context optional error reporter. */
969      JSErrorReporter     errorReporter;      JSErrorReporter     errorReporter;
970    
971      /*      /* Branch callback. */
      * Flag indicating that the operation callback is set. When the flag is 0  
      * but operationCallback is not null, operationCallback stores the branch  
      * callback.  
      */  
     uint32              operationCallbackIsSet :    1;  
     uint32              operationLimit         :    31;  
972      JSOperationCallback operationCallback;      JSOperationCallback operationCallback;
973    
974      /* Interpreter activation count. */      /* Interpreter activation count. */
# Line 866  Line 985 
985      jsrefcount          requestDepth;      jsrefcount          requestDepth;
986      /* Same as requestDepth but ignoring JS_SuspendRequest/JS_ResumeRequest */      /* Same as requestDepth but ignoring JS_SuspendRequest/JS_ResumeRequest */
987      jsrefcount          outstandingRequests;      jsrefcount          outstandingRequests;
     JSTitle             *titleToShare;      /* weak reference, see jslock.c */  
988      JSTitle             *lockedSealedTitle; /* weak ref, for low-cost sealed      JSTitle             *lockedSealedTitle; /* weak ref, for low-cost sealed
989                                                 title locking */                                                 title locking */
990      JSCList             threadLinks;        /* JSThread contextList linkage */      JSCList             threadLinks;        /* JSThread contextList linkage */
# Line 902  Line 1020 
1020    
1021      /* Stored here to avoid passing it around as a parameter. */      /* Stored here to avoid passing it around as a parameter. */
1022      uintN               resolveFlags;      uintN               resolveFlags;
1023    
1024    #ifdef JS_TRACER
1025        /*
1026         * State for the current tree execution.  bailExit is valid if the tree has
1027         * called back into native code via a _FAIL builtin and has not yet bailed,
1028         * else garbage (NULL in debug builds).
1029         */
1030        InterpState         *interpState;
1031        VMSideExit          *bailExit;
1032    
1033        /* Used when calling natives from trace to root the vp vector. */
1034        uintN               nativeVpLen;
1035        jsval               *nativeVp;
1036    #endif
1037  };  };
1038    
1039  #ifdef JS_THREADSAFE  #ifdef JS_THREADSAFE
# Line 909  Line 1041 
1041  #endif  #endif
1042    
1043  #ifdef __cplusplus  #ifdef __cplusplus
1044    
1045    static inline JSAtom **
1046    FrameAtomBase(JSContext *cx, JSStackFrame *fp)
1047    {
1048        return fp->imacpc
1049               ? COMMON_ATOMS_START(&cx->runtime->atomState)
1050               : fp->script->atomMap.vector;
1051    }
1052    
1053  /* FIXME(bug 332648): Move this into a public header. */  /* FIXME(bug 332648): Move this into a public header. */
1054  class JSAutoTempValueRooter  class JSAutoTempValueRooter
1055  {  {
# Line 917  Line 1058 
1058          : mContext(cx) {          : mContext(cx) {
1059          JS_PUSH_TEMP_ROOT(mContext, len, vec, &mTvr);          JS_PUSH_TEMP_ROOT(mContext, len, vec, &mTvr);
1060      }      }
1061      JSAutoTempValueRooter(JSContext *cx, jsval v)      explicit JSAutoTempValueRooter(JSContext *cx, jsval v = JSVAL_NULL)
1062          : mContext(cx) {          : mContext(cx) {
1063          JS_PUSH_SINGLE_TEMP_ROOT(mContext, v, &mTvr);          JS_PUSH_SINGLE_TEMP_ROOT(mContext, v, &mTvr);
1064      }      }
1065        JSAutoTempValueRooter(JSContext *cx, JSString *str)
1066            : mContext(cx) {
1067            JS_PUSH_TEMP_ROOT_STRING(mContext, str, &mTvr);
1068        }
1069        JSAutoTempValueRooter(JSContext *cx, JSObject *obj)
1070            : mContext(cx) {
1071            JS_PUSH_TEMP_ROOT_OBJECT(mContext, obj, &mTvr);
1072        }
1073    
1074      ~JSAutoTempValueRooter() {      ~JSAutoTempValueRooter() {
1075          JS_POP_TEMP_ROOT(mContext, &mTvr);          JS_POP_TEMP_ROOT(mContext, &mTvr);
1076      }      }
1077    
1078        jsval value() { return mTvr.u.value; }
1079        jsval *addr() { return &mTvr.u.value; }
1080    
1081    protected:    protected:
1082      JSContext *mContext;      JSContext *mContext;
1083    
# Line 938  Line 1090 
1090      JSTempValueRooter mTvr;      JSTempValueRooter mTvr;
1091  };  };
1092    
1093    class JSAutoTempIdRooter
1094    {
1095    public:
1096        explicit JSAutoTempIdRooter(JSContext *cx, jsid id = INT_TO_JSID(0))
1097            : mContext(cx) {
1098            JS_PUSH_SINGLE_TEMP_ROOT(mContext, ID_TO_VALUE(id), &mTvr);
1099        }
1100    
1101        ~JSAutoTempIdRooter() {
1102            JS_POP_TEMP_ROOT(mContext, &mTvr);
1103        }
1104    
1105        jsid id() { return (jsid) mTvr.u.value; }
1106        jsid * addr() { return (jsid *) &mTvr.u.value; }
1107    
1108    private:
1109        JSContext *mContext;
1110        JSTempValueRooter mTvr;
1111    };
1112    
1113  class JSAutoResolveFlags  class JSAutoResolveFlags
1114  {  {
1115    public:    public:
# Line 952  Line 1124 
1124      JSContext *mContext;      JSContext *mContext;
1125      uintN mSaved;      uintN mSaved;
1126  };  };
1127  #endif  
1128    #endif /* __cpluscplus */
1129    
1130  /*  /*
1131   * Slightly more readable macros for testing per-context option settings (also   * Slightly more readable macros for testing per-context option settings (also
# Line 989  Line 1162 
1162    
1163  #define JSVERSION_MASK                  0x0FFF  /* see JSVersion in jspubtd.h */  #define JSVERSION_MASK                  0x0FFF  /* see JSVersion in jspubtd.h */
1164  #define JSVERSION_HAS_XML               0x1000  /* flag induced by XML option */  #define JSVERSION_HAS_XML               0x1000  /* flag induced by XML option */
1165    #define JSVERSION_ANONFUNFIX            0x2000  /* see jsapi.h, the comments
1166                                                       for JSOPTION_ANONFUNFIX */
1167    
1168  #define JSVERSION_NUMBER(cx)            ((JSVersion)((cx)->version &          \  #define JSVERSION_NUMBER(cx)            ((JSVersion)((cx)->version &          \
1169                                                       JSVERSION_MASK))                                                       JSVERSION_MASK))
1170  #define JS_HAS_XML_OPTION(cx)           ((cx)->version & JSVERSION_HAS_XML || \  #define JS_HAS_XML_OPTION(cx)           ((cx)->version & JSVERSION_HAS_XML || \
1171                                           JSVERSION_NUMBER(cx) >= JSVERSION_1_6)                                           JSVERSION_NUMBER(cx) >= JSVERSION_1_6)
1172    
1173    extern JSBool
1174    js_InitThreads(JSRuntime *rt);
1175    
1176    extern void
1177    js_FinishThreads(JSRuntime *rt);
1178    
1179    extern void
1180    js_PurgeThreads(JSContext *cx);
1181    
1182  /*  /*
1183   * Initialize a library-wide thread private data index, and remember that it   * Ensures the JSOPTION_XML and JSOPTION_ANONFUNFIX bits of cx->options are
1184   * has already been done, so that it happens only once ever.  Returns true on   * reflected in cx->version, since each bit must travel with a script that has
1185   * success.   * it set.
1186   */   */
1187  extern JSBool  extern void
1188  js_InitThreadPrivateIndex(void (*ptr)(void *));  js_SyncOptionsToVersion(JSContext *cx);
1189    
1190  /*  /*
1191   * Common subroutine of JS_SetVersion and js_SetVersion, to update per-context   * Common subroutine of JS_SetVersion and js_SetVersion, to update per-context
# Line 1034  Line 1218 
1218  extern JSBool  extern JSBool
1219  js_ValidContextPointer(JSRuntime *rt, JSContext *cx);  js_ValidContextPointer(JSRuntime *rt, JSContext *cx);
1220    
1221    static JS_INLINE JSContext *
1222    js_ContextFromLinkField(JSCList *link)
1223    {
1224        JS_ASSERT(link);
1225        return (JSContext *) ((uint8 *) link - offsetof(JSContext, link));
1226    }
1227    
1228  /*  /*
1229   * If unlocked, acquire and release rt->gcLock around *iterp update; otherwise   * If unlocked, acquire and release rt->gcLock around *iterp update; otherwise
1230   * the caller must be holding rt->gcLock.   * the caller must be holding rt->gcLock.
# Line 1042  Line 1233 
1233  js_ContextIterator(JSRuntime *rt, JSBool unlocked, JSContext **iterp);  js_ContextIterator(JSRuntime *rt, JSBool unlocked, JSContext **iterp);
1234    
1235  /*  /*
1236     * Iterate through contexts with active requests. The caller must be holding
1237     * rt->gcLock in case of a thread-safe build, or otherwise guarantee that the
1238     * context list is not alternated asynchroniously.
1239     */
1240    extern JS_FRIEND_API(JSContext *)
1241    js_NextActiveContext(JSRuntime *, JSContext *);
1242    
1243    #ifdef JS_THREADSAFE
1244    
1245    /*
1246     * Count the number of contexts entered requests on the current thread.
1247     */
1248    uint32
1249    js_CountThreadRequests(JSContext *cx);
1250    
1251    /*
1252     * This is a helper for code at can potentially run outside JS request to
1253     * ensure that the GC is not running when the function returns.
1254     *
1255     * This function must be called with the GC lock held.
1256     */
1257    extern void
1258    js_WaitForGC(JSRuntime *rt);
1259    
1260    /*
1261     * If we're in one or more requests (possibly on more than one context)
1262     * running on the current thread, indicate, temporarily, that all these
1263     * requests are inactive so a possible GC can proceed on another thread.
1264     * This function returns the number of discounted requests. The number must
1265     * be passed later to js_ActivateRequestAfterGC to reactivate the requests.
1266     *
1267     * This function must be called with the GC lock held.
1268     */
1269    uint32
1270    js_DiscountRequestsForGC(JSContext *cx);
1271    
1272    /*
1273     * This function must be called with the GC lock held.
1274     */
1275    void
1276    js_RecountRequestsAfterGC(JSRuntime *rt, uint32 requestDebit);
1277    
1278    #else /* !JS_THREADSAFE */
1279    
1280    # define js_WaitForGC(rt)    ((void) 0)
1281    
1282    #endif
1283    
1284    /*
1285   * JSClass.resolve and watchpoint recursion damping machinery.   * JSClass.resolve and watchpoint recursion damping machinery.
1286   */   */
1287  extern JSBool  extern JSBool
# Line 1192  Line 1432 
1432  #endif  #endif
1433    
1434  /*  /*
1435   * Update the operation counter according to the given weight and call the   * If the operation callback flag was set, call the operation callback.
  * operation callback when we reach the operation limit. To make this  
  * frequently executed macro faster we decrease the counter from  
  * JSContext.operationLimit and compare against zero to check the limit.  
  *  
1436   * This macro can run the full GC. Return true if it is OK to continue and   * This macro can run the full GC. Return true if it is OK to continue and
1437   * false otherwise.   * false otherwise.
1438   */   */
1439  #define JS_CHECK_OPERATION_LIMIT(cx, weight)                                  \  #define JS_CHECK_OPERATION_LIMIT(cx) \
1440      (JS_CHECK_OPERATION_WEIGHT(weight),                                       \      (!(cx)->operationCallbackFlag || js_InvokeOperationCallback(cx))
      (((cx)->operationCount -= (weight)) > 0 || js_ResetOperationCount(cx)))  
   
 /*  
  * A version of JS_CHECK_OPERATION_LIMIT that just updates the operation count  
  * without calling the operation callback or any other API. This macro resets  
  * the count to 0 when it becomes negative to prevent a wrap-around when the  
  * macro is called repeatably.  
  */  
 #define JS_COUNT_OPERATION(cx, weight)                                        \  
     ((void)(JS_CHECK_OPERATION_WEIGHT(weight),                                \  
             (cx)->operationCount = ((cx)->operationCount > 0)                 \  
                                    ? (cx)->operationCount - (weight)          \  
                                    : 0))  
   
 /*  
  * The implementation of the above macros assumes that subtracting weights  
  * twice from a positive number does not wrap-around INT32_MIN.  
  */  
 #define JS_CHECK_OPERATION_WEIGHT(weight)                                     \  
     (JS_ASSERT((uint32) (weight) > 0),                                        \  
      JS_ASSERT((uint32) (weight) < JS_BIT(30)))  
   
 /* Relative operations weights. */  
 #define JSOW_JUMP                   1  
 #define JSOW_ALLOCATION             100  
 #define JSOW_LOOKUP_PROPERTY        5  
 #define JSOW_GET_PROPERTY           10  
 #define JSOW_SET_PROPERTY           20  
 #define JSOW_NEW_PROPERTY           200  
 #define JSOW_DELETE_PROPERTY        30  
 #define JSOW_ENTER_SHARP            JS_OPERATION_WEIGHT_BASE  
 #define JSOW_SCRIPT_JUMP            JS_OPERATION_WEIGHT_BASE  
1441    
1442  /*  /*
1443   * Reset the operation count and call the operation callback assuming that the   * Invoke the operation callback and return false if the current execution
1444   * operation limit is reached.   * is to be terminated.
1445   */   */
1446  extern JSBool  extern JSBool
1447  js_ResetOperationCount(JSContext *cx);  js_InvokeOperationCallback(JSContext *cx);
1448    
1449    #ifndef JS_THREADSAFE
1450    # define js_TriggerAllOperationCallbacks(rt, gcLocked) \
1451        js_TriggerAllOperationCallbacks (rt)
1452    #endif
1453    
1454    void
1455    js_TriggerAllOperationCallbacks(JSRuntime *rt, JSBool gcLocked);
1456    
1457    extern JSStackFrame *
1458    js_GetScriptedCaller(JSContext *cx, JSStackFrame *fp);
1459    
1460    extern jsbytecode*
1461    js_GetCurrentBytecodePC(JSContext* cx);
1462    
1463    #ifdef JS_TRACER
1464    /*
1465     * Reconstruct the JS stack and clear cx->tracecx. We must be currently in a
1466     * _FAIL builtin from trace on cx or another context on the same thread. The
1467     * machine code for the trace remains on the C stack when js_DeepBail returns.
1468     *
1469     * Implemented in jstracer.cpp.
1470     */
1471    JS_FORCES_STACK JS_FRIEND_API(void)
1472    js_DeepBail(JSContext *cx);
1473    #endif
1474    
1475    static JS_FORCES_STACK JS_INLINE void
1476    js_LeaveTrace(JSContext *cx)
1477    {
1478    #ifdef JS_TRACER
1479        if (JS_ON_TRACE(cx))
1480            js_DeepBail(cx);
1481    #endif
1482    }
1483    
1484    static JS_INLINE void
1485    js_LeaveTraceIfGlobalObject(JSContext *cx, JSObject *obj)
1486    {
1487        if (!obj->fslots[JSSLOT_PARENT])
1488            js_LeaveTrace(cx);
1489    }
1490    
1491    static JS_INLINE JSBool
1492    js_CanLeaveTrace(JSContext *cx)
1493    {
1494        JS_ASSERT(JS_ON_TRACE(cx));
1495    #ifdef JS_TRACER
1496        return cx->bailExit != NULL;
1497    #else
1498        return JS_FALSE;
1499    #endif
1500    }
1501    
1502    /*
1503     * Get the current cx->fp, first lazily instantiating stack frames if needed.
1504     * (Do not access cx->fp directly except in JS_REQUIRES_STACK code.)
1505     *
1506     * Defined in jstracer.cpp if JS_TRACER is defined.
1507     */
1508    static JS_FORCES_STACK JS_INLINE JSStackFrame *
1509    js_GetTopStackFrame(JSContext *cx)
1510    {
1511        js_LeaveTrace(cx);
1512        return cx->fp;
1513    }
1514    
1515    static JS_INLINE JSBool
1516    js_IsPropertyCacheDisabled(JSContext *cx)
1517    {
1518        return cx->runtime->shapeGen >= SHAPE_OVERFLOW_BIT;
1519    }
1520    
1521    static JS_INLINE uint32
1522    js_RegenerateShapeForGC(JSContext *cx)
1523    {
1524        uint32 shape;
1525    
1526        JS_ASSERT(cx->runtime->gcRunning);
1527    
1528        /*
1529         * Under the GC, compared with js_GenerateShape, we don't need to use
1530         * atomic increments but we still must make sure that after an overflow
1531         * the shape stays such.
1532         */
1533        shape = cx->runtime->shapeGen;
1534        shape = (shape + 1) | (shape & SHAPE_OVERFLOW_BIT);
1535        cx->runtime->shapeGen = shape;
1536        return shape;
1537    }
1538    
1539  JS_END_EXTERN_C  JS_END_EXTERN_C
1540    
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