LCOV - code coverage report
Current view: directory - js/src/vm - Debugger.h (source / functions) Found Hit Coverage
Test: app.info Lines: 50 50 100.0 %
Date: 2012-04-07 Functions: 18 18 100.0 %

       1                 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
       2                 :  * vim: set ts=8 sw=4 et tw=99 ft=cpp:
       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 Debugger object.
      18                 :  *
      19                 :  * The Initial Developer of the Original Code is
      20                 :  * Mozilla Foundation.
      21                 :  * Portions created by the Initial Developer are Copyright (C) 1998-1999
      22                 :  * the Initial Developer. All Rights Reserved.
      23                 :  *
      24                 :  * Contributors:
      25                 :  *   Jim Blandy <jimb@mozilla.com>
      26                 :  *   Jason Orendorff <jorendorff@mozilla.com>
      27                 :  *
      28                 :  * Alternatively, the contents of this file may be used under the terms of
      29                 :  * either of the GNU General Public License Version 2 or later (the "GPL"),
      30                 :  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      31                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      32                 :  * of those above. If you wish to allow use of your version of this file only
      33                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      34                 :  * use your version of this file under the terms of the MPL, indicate your
      35                 :  * decision by deleting the provisions above and replace them with the notice
      36                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      37                 :  * the provisions above, a recipient may use your version of this file under
      38                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      39                 :  *
      40                 :  * ***** END LICENSE BLOCK ***** */
      41                 : 
      42                 : #ifndef Debugger_h__
      43                 : #define Debugger_h__
      44                 : 
      45                 : #include "mozilla/Attributes.h"
      46                 : 
      47                 : #include "jsapi.h"
      48                 : #include "jsclist.h"
      49                 : #include "jscntxt.h"
      50                 : #include "jscompartment.h"
      51                 : #include "jsgc.h"
      52                 : #include "jsweakmap.h"
      53                 : #include "jswrapper.h"
      54                 : 
      55                 : #include "gc/Barrier.h"
      56                 : #include "js/HashTable.h"
      57                 : #include "vm/GlobalObject.h"
      58                 : 
      59                 : namespace js {
      60                 : 
      61                 : class Debugger {
      62                 :     friend class Breakpoint;
      63                 :     friend JSBool (::JS_DefineDebuggerObject)(JSContext *cx, JSObject *obj);
      64                 : 
      65                 :   public:
      66                 :     enum Hook {
      67                 :         OnDebuggerStatement,
      68                 :         OnExceptionUnwind,
      69                 :         OnNewScript,
      70                 :         OnEnterFrame,
      71                 :         HookCount
      72                 :     };
      73                 : 
      74                 :     enum {
      75                 :         JSSLOT_DEBUG_PROTO_START,
      76                 :         JSSLOT_DEBUG_FRAME_PROTO = JSSLOT_DEBUG_PROTO_START,
      77                 :         JSSLOT_DEBUG_ENV_PROTO,
      78                 :         JSSLOT_DEBUG_OBJECT_PROTO,
      79                 :         JSSLOT_DEBUG_SCRIPT_PROTO,
      80                 :         JSSLOT_DEBUG_PROTO_STOP,
      81                 :         JSSLOT_DEBUG_HOOK_START = JSSLOT_DEBUG_PROTO_STOP,
      82                 :         JSSLOT_DEBUG_HOOK_STOP = JSSLOT_DEBUG_HOOK_START + HookCount,
      83                 :         JSSLOT_DEBUG_COUNT = JSSLOT_DEBUG_HOOK_STOP
      84                 :     };
      85                 : 
      86                 :   private:
      87                 :     JSCList link;                       /* See JSRuntime::debuggerList. */
      88                 :     HeapPtrObject object;               /* The Debugger object. Strong reference. */
      89                 :     GlobalObjectSet debuggees;          /* Debuggee globals. Cross-compartment weak references. */
      90                 :     js::HeapPtrObject uncaughtExceptionHook; /* Strong reference. */
      91                 :     bool enabled;
      92                 :     JSCList breakpoints;                /* cyclic list of all js::Breakpoints in this debugger */
      93                 : 
      94                 :     /*
      95                 :      * Map from stack frames that are currently on the stack to Debugger.Frame
      96                 :      * instances.
      97                 :      *
      98                 :      * The keys are always live stack frames. We drop them from this map as
      99                 :      * soon as they leave the stack (see slowPathOnLeaveFrame) and in
     100                 :      * removeDebuggee.
     101                 :      *
     102                 :      * We don't trace the keys of this map (the frames are on the stack and
     103                 :      * thus necessarily live), but we do trace the values. It's like a WeakMap
     104                 :      * that way, but since stack frames are not gc-things, the implementation
     105                 :      * has to be different.
     106                 :      */
     107                 :     typedef HashMap<StackFrame *, HeapPtrObject, DefaultHasher<StackFrame *>, RuntimeAllocPolicy>
     108                 :         FrameMap;
     109                 :     FrameMap frames;
     110                 : 
     111                 :     /* An ephemeral map from JSScript* to Debugger.Script instances. */
     112                 :     typedef WeakMap<HeapPtrScript, HeapPtrObject> ScriptWeakMap;
     113                 :     ScriptWeakMap scripts;
     114                 : 
     115                 :     /* The map from debuggee objects to their Debugger.Object instances. */
     116                 :     typedef WeakMap<HeapPtrObject, HeapPtrObject> ObjectWeakMap;
     117                 :     ObjectWeakMap objects;
     118                 : 
     119                 :     /* The map from debuggee Envs to Debugger.Environment instances. */
     120                 :     ObjectWeakMap environments;
     121                 : 
     122                 :     class FrameRange;
     123                 :     class ScriptQuery;
     124                 : 
     125                 :     bool addDebuggeeGlobal(JSContext *cx, GlobalObject *obj);
     126                 :     void removeDebuggeeGlobal(FreeOp *fop, GlobalObject *global,
     127                 :                               GlobalObjectSet::Enum *compartmentEnum,
     128                 :                               GlobalObjectSet::Enum *debugEnum);
     129                 : 
     130                 :     /*
     131                 :      * Cope with an error or exception in a debugger hook.
     132                 :      *
     133                 :      * If callHook is true, then call the uncaughtExceptionHook, if any. If, in
     134                 :      * addition, vp is non-null, then parse the value returned by
     135                 :      * uncaughtExceptionHook as a resumption value.
     136                 :      *
     137                 :      * If there is no uncaughtExceptionHook, or if it fails, report and clear
     138                 :      * the pending exception on ac.context and return JSTRAP_ERROR.
     139                 :      *
     140                 :      * This always calls ac.leave(); ac is a parameter because this method must
     141                 :      * do some things in the debugger compartment and some things in the
     142                 :      * debuggee compartment.
     143                 :      */
     144                 :     JSTrapStatus handleUncaughtException(AutoCompartment &ac, Value *vp, bool callHook);
     145                 : 
     146                 :     /*
     147                 :      * Handle the result of a hook that is expected to return a resumption
     148                 :      * value <https://wiki.mozilla.org/Debugger#Resumption_Values>. This is called
     149                 :      * when we return from a debugging hook to debuggee code. The interpreter wants
     150                 :      * a (JSTrapStatus, Value) pair telling it how to proceed.
     151                 :      *
     152                 :      * Precondition: ac is entered. We are in the debugger compartment.
     153                 :      *
     154                 :      * Postcondition: This called ac.leave(). See handleUncaughtException.
     155                 :      *
     156                 :      * If ok is false, the hook failed. If an exception is pending in
     157                 :      * ac.context(), return handleUncaughtException(ac, vp, callhook).
     158                 :      * Otherwise just return JSTRAP_ERROR.
     159                 :      *
     160                 :      * If ok is true, there must be no exception pending in ac.context(). rv may be:
     161                 :      *     undefined - Return JSTRAP_CONTINUE to continue execution normally.
     162                 :      *     {return: value} or {throw: value} - Call unwrapDebuggeeValue to
     163                 :      *         unwrap value. Store the result in *vp and return JSTRAP_RETURN
     164                 :      *         or JSTRAP_THROW. The interpreter will force the current frame to
     165                 :      *         return or throw an exception.
     166                 :      *     null - Return JSTRAP_ERROR to terminate the debuggee with an
     167                 :      *         uncatchable error.
     168                 :      *     anything else - Make a new TypeError the pending exception and
     169                 :      *         return handleUncaughtException(ac, vp, callHook).
     170                 :      */
     171                 :     JSTrapStatus parseResumptionValue(AutoCompartment &ac, bool ok, const Value &rv, Value *vp,
     172                 :                                       bool callHook = true);
     173                 : 
     174                 :     JSObject *unwrapDebuggeeArgument(JSContext *cx, const Value &v);
     175                 : 
     176                 :     static void traceObject(JSTracer *trc, JSObject *obj);
     177                 :     void trace(JSTracer *trc);
     178                 :     static void finalize(FreeOp *fop, JSObject *obj);
     179                 :     void markKeysInCompartment(JSTracer *tracer);
     180                 : 
     181                 :     static Class jsclass;
     182                 : 
     183                 :     static Debugger *fromThisValue(JSContext *cx, const CallArgs &ca, const char *fnname);
     184                 :     static JSBool getEnabled(JSContext *cx, unsigned argc, Value *vp);
     185                 :     static JSBool setEnabled(JSContext *cx, unsigned argc, Value *vp);
     186                 :     static JSBool getHookImpl(JSContext *cx, unsigned argc, Value *vp, Hook which);
     187                 :     static JSBool setHookImpl(JSContext *cx, unsigned argc, Value *vp, Hook which);
     188                 :     static JSBool getOnDebuggerStatement(JSContext *cx, unsigned argc, Value *vp);
     189                 :     static JSBool setOnDebuggerStatement(JSContext *cx, unsigned argc, Value *vp);
     190                 :     static JSBool getOnExceptionUnwind(JSContext *cx, unsigned argc, Value *vp);
     191                 :     static JSBool setOnExceptionUnwind(JSContext *cx, unsigned argc, Value *vp);
     192                 :     static JSBool getOnNewScript(JSContext *cx, unsigned argc, Value *vp);
     193                 :     static JSBool setOnNewScript(JSContext *cx, unsigned argc, Value *vp);
     194                 :     static JSBool getOnEnterFrame(JSContext *cx, unsigned argc, Value *vp);
     195                 :     static JSBool setOnEnterFrame(JSContext *cx, unsigned argc, Value *vp);
     196                 :     static JSBool getUncaughtExceptionHook(JSContext *cx, unsigned argc, Value *vp);
     197                 :     static JSBool setUncaughtExceptionHook(JSContext *cx, unsigned argc, Value *vp);
     198                 :     static JSBool addDebuggee(JSContext *cx, unsigned argc, Value *vp);
     199                 :     static JSBool removeDebuggee(JSContext *cx, unsigned argc, Value *vp);
     200                 :     static JSBool hasDebuggee(JSContext *cx, unsigned argc, Value *vp);
     201                 :     static JSBool getDebuggees(JSContext *cx, unsigned argc, Value *vp);
     202                 :     static JSBool getNewestFrame(JSContext *cx, unsigned argc, Value *vp);
     203                 :     static JSBool clearAllBreakpoints(JSContext *cx, unsigned argc, Value *vp);
     204                 :     static JSBool findScripts(JSContext *cx, unsigned argc, Value *vp);
     205                 :     static JSBool wrap(JSContext *cx, unsigned argc, Value *vp);
     206                 :     static JSBool construct(JSContext *cx, unsigned argc, Value *vp);
     207                 :     static JSPropertySpec properties[];
     208                 :     static JSFunctionSpec methods[];
     209                 : 
     210                 :     JSObject *getHook(Hook hook) const;
     211                 :     bool hasAnyLiveHooks() const;
     212                 : 
     213                 :     static JSTrapStatus slowPathOnEnterFrame(JSContext *cx, Value *vp);
     214                 :     static bool slowPathOnLeaveFrame(JSContext *cx, bool ok);
     215                 :     static void slowPathOnNewScript(JSContext *cx, JSScript *script,
     216                 :                                     GlobalObject *compileAndGoGlobal);
     217                 :     static JSTrapStatus dispatchHook(JSContext *cx, Value *vp, Hook which);
     218                 : 
     219                 :     JSTrapStatus fireDebuggerStatement(JSContext *cx, Value *vp);
     220                 :     JSTrapStatus fireExceptionUnwind(JSContext *cx, Value *vp);
     221                 :     JSTrapStatus fireEnterFrame(JSContext *cx, Value *vp);
     222                 : 
     223                 :     /*
     224                 :      * Allocate and initialize a Debugger.Script instance whose referent is
     225                 :      * |script|.
     226                 :      */
     227                 :     JSObject *newDebuggerScript(JSContext *cx, JSScript *script);
     228                 : 
     229                 :     /*
     230                 :      * Receive a "new script" event from the engine. A new script was compiled
     231                 :      * or deserialized.
     232                 :      */
     233                 :     void fireNewScript(JSContext *cx, JSScript *script);
     234                 : 
     235                 :     static inline Debugger *fromLinks(JSCList *links);
     236                 :     inline Breakpoint *firstBreakpoint() const;
     237                 : 
     238                 :   public:
     239                 :     Debugger(JSContext *cx, JSObject *dbg);
     240                 :     ~Debugger();
     241                 : 
     242                 :     bool init(JSContext *cx);
     243                 :     inline const js::HeapPtrObject &toJSObject() const;
     244                 :     inline js::HeapPtrObject &toJSObjectRef();
     245                 :     static inline Debugger *fromJSObject(JSObject *obj);
     246                 :     static Debugger *fromChildJSObject(JSObject *obj);
     247                 : 
     248                 :     /*********************************** Methods for interaction with the GC. */
     249                 : 
     250                 :     /*
     251                 :      * A Debugger object is live if:
     252                 :      *   * the Debugger JSObject is live (Debugger::trace handles this case); OR
     253                 :      *   * it is in the middle of dispatching an event (the event dispatching
     254                 :      *     code roots it in this case); OR
     255                 :      *   * it is enabled, and it is debugging at least one live compartment,
     256                 :      *     and at least one of the following is true:
     257                 :      *       - it has a debugger hook installed
     258                 :      *       - it has a breakpoint set on a live script
     259                 :      *       - it has a watchpoint set on a live object.
     260                 :      *
     261                 :      * Debugger::markAllIteratively handles the last case. If it finds any
     262                 :      * Debugger objects that are definitely live but not yet marked, it marks
     263                 :      * them and returns true. If not, it returns false.
     264                 :      */
     265                 :     static void markCrossCompartmentDebuggerObjectReferents(JSTracer *tracer);
     266                 :     static bool markAllIteratively(GCMarker *trc);
     267                 :     static void sweepAll(FreeOp *fop);
     268                 :     static void detachAllDebuggersFromGlobal(FreeOp *fop, GlobalObject *global,
     269                 :                                              GlobalObjectSet::Enum *compartmentEnum);
     270                 : 
     271                 :     static inline JSTrapStatus onEnterFrame(JSContext *cx, Value *vp);
     272                 :     static inline bool onLeaveFrame(JSContext *cx, bool ok);
     273                 :     static inline JSTrapStatus onDebuggerStatement(JSContext *cx, Value *vp);
     274                 :     static inline JSTrapStatus onExceptionUnwind(JSContext *cx, Value *vp);
     275                 :     static inline void onNewScript(JSContext *cx, JSScript *script,
     276                 :                                    GlobalObject *compileAndGoGlobal);
     277                 :     static JSTrapStatus onTrap(JSContext *cx, Value *vp);
     278                 :     static JSTrapStatus onSingleStep(JSContext *cx, Value *vp);
     279                 : 
     280                 :     /************************************* Functions for use by Debugger.cpp. */
     281                 : 
     282                 :     inline bool observesEnterFrame() const;
     283                 :     inline bool observesNewScript() const;
     284                 :     inline bool observesGlobal(GlobalObject *global) const;
     285                 :     inline bool observesFrame(StackFrame *fp) const;
     286                 : 
     287                 :     /*
     288                 :      * If env is NULL, call vp->setNull() and return true. Otherwise, find or
     289                 :      * create a Debugger.Environment object for the given Env. On success,
     290                 :      * store the Environment object in *vp and return true.
     291                 :      */
     292                 :     bool wrapEnvironment(JSContext *cx, Env *env, Value *vp);
     293                 : 
     294                 :     /*
     295                 :      * Like cx->compartment->wrap(cx, vp), but for the debugger compartment.
     296                 :      *
     297                 :      * Preconditions: *vp is a value from a debuggee compartment; cx is in the
     298                 :      * debugger's compartment.
     299                 :      *
     300                 :      * If *vp is an object, this produces a (new or existing) Debugger.Object
     301                 :      * wrapper for it. Otherwise this is the same as JSCompartment::wrap.
     302                 :      */
     303                 :     bool wrapDebuggeeValue(JSContext *cx, Value *vp);
     304                 : 
     305                 :     /*
     306                 :      * Unwrap a Debug.Object, without rewrapping it for any particular debuggee
     307                 :      * compartment.
     308                 :      *
     309                 :      * Preconditions: cx is in the debugger compartment. *vp is a value in that
     310                 :      * compartment. (*vp should be a "debuggee value", meaning it is the
     311                 :      * debugger's reflection of a value in the debuggee.)
     312                 :      *
     313                 :      * If *vp is a Debugger.Object, store the referent in *vp. Otherwise, if *vp
     314                 :      * is an object, throw a TypeError, because it is not a debuggee
     315                 :      * value. Otherwise *vp is a primitive, so leave it alone.
     316                 :      *
     317                 :      * When passing values from the debuggee to the debugger:
     318                 :      *     enter debugger compartment;
     319                 :      *     call wrapDebuggeeValue;  // compartment- and debugger-wrapping
     320                 :      *
     321                 :      * When passing values from the debugger to the debuggee:
     322                 :      *     call unwrapDebuggeeValue;  // debugger-unwrapping
     323                 :      *     enter debuggee compartment;
     324                 :      *     call cx->compartment->wrap;  // compartment-rewrapping
     325                 :      *
     326                 :      * (Extreme nerd sidebar: Unwrapping happens in two steps because there are
     327                 :      * two different kinds of symmetry at work: regardless of which direction
     328                 :      * we're going, we want any exceptions to be created and thrown in the
     329                 :      * debugger compartment--mirror symmetry. But compartment wrapping always
     330                 :      * happens in the target compartment--rotational symmetry.)
     331                 :      */
     332                 :     bool unwrapDebuggeeValue(JSContext *cx, Value *vp);
     333                 : 
     334                 :     /* Store the Debugger.Frame object for the frame fp in *vp. */
     335                 :     bool getScriptFrame(JSContext *cx, StackFrame *fp, Value *vp);
     336                 : 
     337                 :     /*
     338                 :      * Set |*status| and |*value| to a (JSTrapStatus, Value) pair reflecting a
     339                 :      * standard SpiderMonkey call state: a boolean success value |ok|, a return
     340                 :      * value |rv|, and a context |cx| that may or may not have an exception set.
     341                 :      * If an exception was pending on |cx|, it is cleared (and |ok| is asserted
     342                 :      * to be false).
     343                 :      */
     344                 :     static void resultToCompletion(JSContext *cx, bool ok, const Value &rv,
     345                 :                                    JSTrapStatus *status, Value *value);
     346                 : 
     347                 :     /*
     348                 :      * Set |*result| to a JavaScript completion value corresponding to |status|
     349                 :      * and |value|. |value| should be the return value or exception value, not
     350                 :      * wrapped as a debuggee value. |cx| must be in the debugger compartment.
     351                 :      */
     352                 :     bool newCompletionValue(JSContext *cx, JSTrapStatus status, Value value, Value *result);
     353                 : 
     354                 :     /*
     355                 :      * Precondition: we are in the debuggee compartment (ac is entered) and ok
     356                 :      * is true if the operation in the debuggee compartment succeeded, false on
     357                 :      * error or exception.
     358                 :      *
     359                 :      * Postcondition: we are in the debugger compartment, having called
     360                 :      * ac.leave() even if an error occurred.
     361                 :      *
     362                 :      * On success, a completion value is in vp and ac.context does not have a
     363                 :      * pending exception. (This ordinarily returns true even if the ok argument
     364                 :      * is false.)
     365                 :      */
     366                 :     bool receiveCompletionValue(AutoCompartment &ac, bool ok, Value val, Value *vp);
     367                 : 
     368                 :     /*
     369                 :      * Return the Debugger.Script object for |script|, or create a new one if
     370                 :      * needed. The context |cx| must be in the debugger compartment; |script|
     371                 :      * must be a script in a debuggee compartment.
     372                 :      */
     373                 :     JSObject *wrapScript(JSContext *cx, JSScript *script);
     374                 : 
     375                 :   private:
     376                 :     Debugger(const Debugger &) MOZ_DELETE;
     377                 :     Debugger & operator=(const Debugger &) MOZ_DELETE;
     378                 : };
     379                 : 
     380            1172 : class BreakpointSite {
     381                 :     friend class Breakpoint;
     382                 :     friend struct ::JSCompartment;
     383                 :     friend struct ::JSScript;
     384                 :     friend class Debugger;
     385                 : 
     386                 :   public:
     387                 :     JSScript * const script;
     388                 :     jsbytecode * const pc;
     389                 : 
     390                 :   private:
     391                 :     /*
     392                 :      * The holder object for script, if known, else NULL.  This is NULL for
     393                 :      * cached eval scripts and for JSD1 traps. It is always non-null for JSD2
     394                 :      * breakpoints in held scripts.
     395                 :      */
     396                 :     GlobalObject *scriptGlobal;
     397                 : 
     398                 :     JSCList breakpoints;  /* cyclic list of all js::Breakpoints at this instruction */
     399                 :     size_t enabledCount;  /* number of breakpoints in the list that are enabled */
     400                 :     JSTrapHandler trapHandler;  /* jsdbgapi trap state */
     401                 :     HeapValue trapClosure;
     402                 : 
     403                 :     void recompile(FreeOp *fop);
     404                 : 
     405                 :   public:
     406                 :     BreakpointSite(JSScript *script, jsbytecode *pc);
     407                 :     Breakpoint *firstBreakpoint() const;
     408                 :     bool hasBreakpoint(Breakpoint *bp);
     409                 :     bool hasTrap() const { return !!trapHandler; }
     410                 :     GlobalObject *getScriptGlobal() const { return scriptGlobal; }
     411                 : 
     412                 :     void inc(FreeOp *fop);
     413                 :     void dec(FreeOp *fop);
     414                 :     void setTrap(FreeOp *fop, JSTrapHandler handler, const Value &closure);
     415                 :     void clearTrap(FreeOp *fop, JSTrapHandler *handlerp = NULL, Value *closurep = NULL);
     416                 :     void destroyIfEmpty(FreeOp *fop);
     417                 : };
     418                 : 
     419                 : /*
     420                 :  * Each Breakpoint is a member of two linked lists: its debugger's list and its
     421                 :  * site's list.
     422                 :  *
     423                 :  * GC rules:
     424                 :  *   - script is live, breakpoint exists, and debugger is enabled
     425                 :  *      ==> debugger is live
     426                 :  *   - script is live, breakpoint exists, and debugger is live
     427                 :  *      ==> retain the breakpoint and the handler object is live
     428                 :  *
     429                 :  * Debugger::markAllIteratively implements these two rules. It uses
     430                 :  * Debugger::hasAnyLiveHooks to check for rule 1.
     431                 :  *
     432                 :  * Nothing else causes a breakpoint to be retained, so if its script or
     433                 :  * debugger is collected, the breakpoint is destroyed during GC sweep phase,
     434                 :  * even if the debugger compartment isn't being GC'd. This is implemented in
     435                 :  * JSCompartment::sweepBreakpoints.
     436                 :  */
     437            1269 : class Breakpoint {
     438                 :     friend struct ::JSCompartment;
     439                 :     friend class Debugger;
     440                 : 
     441                 :   public:
     442                 :     Debugger * const debugger;
     443                 :     BreakpointSite * const site;
     444                 :   private:
     445                 :     js::HeapPtrObject handler;
     446                 :     JSCList debuggerLinks;
     447                 :     JSCList siteLinks;
     448                 : 
     449                 :   public:
     450                 :     static Breakpoint *fromDebuggerLinks(JSCList *links);
     451                 :     static Breakpoint *fromSiteLinks(JSCList *links);
     452                 :     Breakpoint(Debugger *debugger, BreakpointSite *site, JSObject *handler);
     453                 :     void destroy(FreeOp *fop);
     454                 :     Breakpoint *nextInDebugger();
     455                 :     Breakpoint *nextInSite();
     456             873 :     const HeapPtrObject &getHandler() const { return handler; }
     457             163 :     HeapPtrObject &getHandlerRef() { return handler; }
     458                 : };
     459                 : 
     460                 : Debugger *
     461           14434 : Debugger::fromLinks(JSCList *links)
     462                 : {
     463           14434 :     unsigned char *p = reinterpret_cast<unsigned char *>(links);
     464           14434 :     return reinterpret_cast<Debugger *>(p - offsetof(Debugger, link));
     465                 : }
     466                 : 
     467                 : Breakpoint *
     468            6940 : Debugger::firstBreakpoint() const
     469                 : {
     470            6940 :     if (JS_CLIST_IS_EMPTY(&breakpoints))
     471            6519 :         return NULL;
     472             421 :     return Breakpoint::fromDebuggerLinks(JS_NEXT_LINK(&breakpoints));
     473                 : }
     474                 : 
     475                 : const js::HeapPtrObject &
     476           34638 : Debugger::toJSObject() const
     477                 : {
     478           34638 :     JS_ASSERT(object);
     479           34638 :     return object;
     480                 : }
     481                 : 
     482                 : js::HeapPtrObject &
     483            6857 : Debugger::toJSObjectRef()
     484                 : {
     485            6857 :     JS_ASSERT(object);
     486            6857 :     return object;
     487                 : }
     488                 : 
     489                 : Debugger *
     490          178220 : Debugger::fromJSObject(JSObject *obj)
     491                 : {
     492          178220 :     JS_ASSERT(js::GetObjectClass(obj) == &jsclass);
     493          178220 :     return (Debugger *) obj->getPrivate();
     494                 : }
     495                 : 
     496                 : bool
     497           33903 : Debugger::observesEnterFrame() const
     498                 : {
     499           33903 :     return enabled && getHook(OnEnterFrame);
     500                 : }
     501                 : 
     502                 : bool
     503           11110 : Debugger::observesNewScript() const
     504                 : {
     505           11110 :     return enabled && getHook(OnNewScript);
     506                 : }
     507                 : 
     508                 : bool
     509           36443 : Debugger::observesGlobal(GlobalObject *global) const
     510                 : {
     511           36443 :     return debuggees.has(global);
     512                 : }
     513                 : 
     514                 : bool
     515           35903 : Debugger::observesFrame(StackFrame *fp) const
     516                 : {
     517           35903 :     return !fp->isDummyFrame() && observesGlobal(&fp->scopeChain().global());
     518                 : }
     519                 : 
     520                 : JSTrapStatus
     521        12393915 : Debugger::onEnterFrame(JSContext *cx, Value *vp)
     522                 : {
     523        12393915 :     if (cx->compartment->getDebuggees().empty())
     524        12365741 :         return JSTRAP_CONTINUE;
     525           28174 :     return slowPathOnEnterFrame(cx, vp);
     526                 : }
     527                 : 
     528                 : bool
     529        12394644 : Debugger::onLeaveFrame(JSContext *cx, bool ok)
     530                 : {
     531                 :     /* Traps must be cleared from eval frames, see slowPathOnLeaveFrame. */
     532        12394644 :     bool evalTraps = cx->fp()->isEvalFrame() &&
     533        12394644 :                      cx->fp()->script()->hasAnyBreakpointsOrStepMode();
     534        12394644 :     if (!cx->compartment->getDebuggees().empty() || evalTraps)
     535           28368 :         ok = slowPathOnLeaveFrame(cx, ok);
     536        12394644 :     return ok;
     537                 : }
     538                 : 
     539                 : JSTrapStatus
     540            8173 : Debugger::onDebuggerStatement(JSContext *cx, Value *vp)
     541                 : {
     542            8173 :     return cx->compartment->getDebuggees().empty()
     543                 :            ? JSTRAP_CONTINUE
     544            8173 :            : dispatchHook(cx, vp, OnDebuggerStatement);
     545                 : }
     546                 : 
     547                 : JSTrapStatus
     548            1116 : Debugger::onExceptionUnwind(JSContext *cx, Value *vp)
     549                 : {
     550            1116 :     return cx->compartment->getDebuggees().empty()
     551                 :            ? JSTRAP_CONTINUE
     552            1116 :            : dispatchHook(cx, vp, OnExceptionUnwind);
     553                 : }
     554                 : 
     555                 : void
     556          107244 : Debugger::onNewScript(JSContext *cx, JSScript *script, GlobalObject *compileAndGoGlobal)
     557                 : {
     558          107244 :     JS_ASSERT_IF(script->compileAndGo, compileAndGoGlobal);
     559          107244 :     JS_ASSERT_IF(!script->compileAndGo, !compileAndGoGlobal);
     560          107244 :     if (!script->compartment()->getDebuggees().empty())
     561            9834 :         slowPathOnNewScript(cx, script, compileAndGoGlobal);
     562          107244 : }
     563                 : 
     564                 : extern JSBool
     565                 : EvaluateInEnv(JSContext *cx, Env *env, StackFrame *fp, const jschar *chars,
     566                 :               unsigned length, const char *filename, unsigned lineno, Value *rval);
     567                 : 
     568                 : }
     569                 : 
     570                 : #endif /* Debugger_h__ */

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