The Tor Browser: js/jsd/jsd_hook.cpp@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-

     2  * vim: set ts=8 sts=4 et sw=4 tw=99:

     3  * This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     7 /*

     8  * JavaScript Debugging support - Hook support

     9  */

    11 #include "jsd.h"

    13 JSTrapStatus

    14 jsd_InterruptHandler(JSContext *cx, JSScript *script, jsbytecode *pc, jsval *rval,

    15                      void *closure)

    16 {

    17     JSDScript*      jsdscript;

    18     JSDContext*     jsdc = (JSDContext*) closure;

    19     JSD_ExecutionHookProc hook;

    20     void*                 hookData;

    22     if( ! jsdc || ! jsdc->inited )

    23         return JSTRAP_CONTINUE;

    25     if( JSD_IS_DANGEROUS_THREAD(jsdc) )

    26         return JSTRAP_CONTINUE;

    28     /* local in case jsdc->interruptHook gets cleared on another thread */

    29     JSD_LOCK();

    30     hook     = jsdc->interruptHook;

    31     hookData = jsdc->interruptHookData;

    32     JSD_UNLOCK();

    34     if (!hook)

    35         return JSTRAP_CONTINUE;

    37     JSD_LOCK_SCRIPTS(jsdc);

    38     jsdscript = jsd_FindOrCreateJSDScript(jsdc, cx, script, JSNullFramePtr());

    39     JSD_UNLOCK_SCRIPTS(jsdc);

    40     if( ! jsdscript )

    41         return JSTRAP_CONTINUE;

    43     return jsd_CallExecutionHook(jsdc, cx, JSD_HOOK_INTERRUPTED,

    44                                  hook, hookData, rval);

    45 }

    47 JSTrapStatus

    48 jsd_DebuggerHandler(JSContext *cx, JSScript *script, jsbytecode *pc,

    49                     jsval *rval, void *closure)

    50 {

    51     JSDScript*      jsdscript;

    52     JSDContext*     jsdc = (JSDContext*) closure;

    53     JSD_ExecutionHookProc hook;

    54     void*                 hookData;

    56     if( ! jsdc || ! jsdc->inited )

    57         return JSTRAP_CONTINUE;

    59     if( JSD_IS_DANGEROUS_THREAD(jsdc) )

    60         return JSTRAP_CONTINUE;

    62     /* local in case jsdc->debuggerHook gets cleared on another thread */

    63     JSD_LOCK();

    64     hook     = jsdc->debuggerHook;

    65     hookData = jsdc->debuggerHookData;

    66     JSD_UNLOCK();

    67     if(!hook)

    68         return JSTRAP_CONTINUE;

    70     JSD_LOCK_SCRIPTS(jsdc);

    71     jsdscript = jsd_FindOrCreateJSDScript(jsdc, cx, script, JSNullFramePtr());

    72     JSD_UNLOCK_SCRIPTS(jsdc);

    73     if( ! jsdscript )

    74         return JSTRAP_CONTINUE;

    76     return jsd_CallExecutionHook(jsdc, cx, JSD_HOOK_DEBUGGER_KEYWORD,

    77                                  hook, hookData, rval);

    78 }

    81 JSTrapStatus

    82 jsd_ThrowHandler(JSContext *cx, JSScript *script, jsbytecode *pc,

    83                  jsval *rvalArg, void *closure)

    84 {

    85     JSDScript*      jsdscript;

    86     JSDContext*     jsdc = (JSDContext*) closure;

    87     JSD_ExecutionHookProc hook;

    88     void*                 hookData;

    90     if( ! jsdc || ! jsdc->inited )

    91         return JSTRAP_CONTINUE;

    93     if( JSD_IS_DANGEROUS_THREAD(jsdc) )

    94         return JSTRAP_CONTINUE;

    96     /* local in case jsdc->throwHook gets cleared on another thread */

    97     JSD_LOCK();

    98     hook     = jsdc->throwHook;

    99     hookData = jsdc->throwHookData;

   100     JSD_UNLOCK();

   101     if (!hook)

   102         return JSTRAP_CONTINUE;

   104     JSD_LOCK_SCRIPTS(jsdc);

   105     jsdscript = jsd_FindOrCreateJSDScript(jsdc, cx, script, JSNullFramePtr());

   106     JSD_UNLOCK_SCRIPTS(jsdc);

   107     if( ! jsdscript )

   108         return JSTRAP_CONTINUE;

   110     JS::RootedValue rval(cx);

   111     JS_GetPendingException(cx, &rval);

   113     JSTrapStatus result = jsd_CallExecutionHook(jsdc, cx, JSD_HOOK_THROW,

   114                                                 hook, hookData, rval.address());

   115     *rvalArg = rval;

   116     return result;

   117 }

   119 JSTrapStatus

   120 jsd_CallExecutionHook(JSDContext* jsdc,

   121                       JSContext *cx,

   122                       unsigned type,

   123                       JSD_ExecutionHookProc hook,

   124                       void* hookData,

   125                       jsval* rval)

   126 {

   127     unsigned hookanswer = JSD_HOOK_THROW == type ?

   128                             JSD_HOOK_RETURN_CONTINUE_THROW :

   129                             JSD_HOOK_RETURN_CONTINUE;

   130     JSDThreadState* jsdthreadstate;

   132     if(hook && nullptr != (jsdthreadstate = jsd_NewThreadState(jsdc, cx)))

   133     {

   134         if ((type != JSD_HOOK_THROW && type != JSD_HOOK_INTERRUPTED) ||

   135             jsdc->flags & JSD_MASK_TOP_FRAME_ONLY ||

   136             !(jsdthreadstate->flags & TS_HAS_DISABLED_FRAME))

   137         {

   138             /*

   139              * if it's not a throw and it's not an interrupt,

   140              * or we're only masking the top frame,

   141              * or there are no disabled frames in this stack,

   142              * then call out.

   143              */

   144              hookanswer = hook(jsdc, jsdthreadstate, type, hookData, rval);

   145              jsd_DestroyThreadState(jsdc, jsdthreadstate);

   146         }

   147     }

   149     switch(hookanswer)

   150     {

   151         case JSD_HOOK_RETURN_ABORT:

   152         case JSD_HOOK_RETURN_HOOK_ERROR:

   153             return JSTRAP_ERROR;

   154         case JSD_HOOK_RETURN_RET_WITH_VAL:

   155             return JSTRAP_RETURN;

   156         case JSD_HOOK_RETURN_THROW_WITH_VAL:

   157             return JSTRAP_THROW;

   158         case JSD_HOOK_RETURN_CONTINUE:

   159             break;

   160         case JSD_HOOK_RETURN_CONTINUE_THROW:

   161             /* only makes sense for jsd_ThrowHandler (which init'd rval) */

   162             MOZ_ASSERT(JSD_HOOK_THROW == type);

   163             return JSTRAP_THROW;

   164         default:

   165             MOZ_ASSERT(0);

   166             break;

   167     }

   168     return JSTRAP_CONTINUE;

   169 }

   171 bool

   172 jsd_CallCallHook (JSDContext* jsdc,

   173                   JSContext *cx,

   174                   unsigned type,

   175                   JSD_CallHookProc hook,

   176                   void* hookData)

   177 {

   178     bool hookanswer;

   179     JSDThreadState*  jsdthreadstate;

   181     hookanswer = false;

   182     if(hook && nullptr != (jsdthreadstate = jsd_NewThreadState(jsdc, cx)))

   183     {

   184         hookanswer = hook(jsdc, jsdthreadstate, type, hookData);

   185         jsd_DestroyThreadState(jsdc, jsdthreadstate);

   186     }

   188     return hookanswer;

   189 }

   191 bool

   192 jsd_SetInterruptHook(JSDContext*           jsdc,

   193                      JSD_ExecutionHookProc hook,

   194                      void*                 callerdata)

   195 {

   196     JSD_LOCK();

   197     jsdc->interruptHookData  = callerdata;

   198     jsdc->interruptHook      = hook;

   199     JS_SetInterrupt(jsdc->jsrt, jsd_InterruptHandler, (void*) jsdc);

   200     JSD_UNLOCK();

   202     return true;

   203 }

   205 bool

   206 jsd_ClearInterruptHook(JSDContext* jsdc)

   207 {

   208     JSD_LOCK();

   209     JS_ClearInterrupt(jsdc->jsrt, nullptr, nullptr);

   210     jsdc->interruptHook      = nullptr;

   211     JSD_UNLOCK();

   213     return true;

   214 }

   216 bool

   217 jsd_SetDebugBreakHook(JSDContext*           jsdc,

   218                       JSD_ExecutionHookProc hook,

   219                       void*                 callerdata)

   220 {

   221     JSD_LOCK();

   222     jsdc->debugBreakHookData  = callerdata;

   223     jsdc->debugBreakHook      = hook;

   224     JSD_UNLOCK();

   226     return true;

   227 }

   229 bool

   230 jsd_ClearDebugBreakHook(JSDContext* jsdc)

   231 {

   232     JSD_LOCK();

   233     jsdc->debugBreakHook      = nullptr;

   234     JSD_UNLOCK();

   236     return true;

   237 }

   239 bool

   240 jsd_SetDebuggerHook(JSDContext*           jsdc,

   241                       JSD_ExecutionHookProc hook,

   242                       void*                 callerdata)

   243 {

   244     JSD_LOCK();

   245     jsdc->debuggerHookData  = callerdata;

   246     jsdc->debuggerHook      = hook;

   247     JSD_UNLOCK();

   249     return true;

   250 }

   252 bool

   253 jsd_ClearDebuggerHook(JSDContext* jsdc)

   254 {

   255     JSD_LOCK();

   256     jsdc->debuggerHook      = nullptr;

   257     JSD_UNLOCK();

   259     return true;

   260 }

   262 bool

   263 jsd_SetThrowHook(JSDContext*           jsdc,

   264                  JSD_ExecutionHookProc hook,

   265                  void*                 callerdata)

   266 {

   267     JSD_LOCK();

   268     jsdc->throwHookData  = callerdata;

   269     jsdc->throwHook      = hook;

   270     JSD_UNLOCK();

   272     return true;

   273 }

   275 bool

   276 jsd_ClearThrowHook(JSDContext* jsdc)

   277 {

   278     JSD_LOCK();

   279     jsdc->throwHook      = nullptr;

   280     JSD_UNLOCK();

   282     return true;

   283 }

   285 bool

   286 jsd_SetFunctionHook(JSDContext*      jsdc,

   287                     JSD_CallHookProc hook,

   288                     void*            callerdata)

   289 {

   290     JSD_LOCK();

   291     jsdc->functionHookData  = callerdata;

   292     jsdc->functionHook      = hook;

   293     JSD_UNLOCK();

   295     return true;

   296 }

   298 bool

   299 jsd_ClearFunctionHook(JSDContext* jsdc)

   300 {

   301     JSD_LOCK();

   302     jsdc->functionHook      = nullptr;

   303     JSD_UNLOCK();

   305     return true;

   306 }

   308 bool

   309 jsd_SetTopLevelHook(JSDContext*      jsdc,

   310                     JSD_CallHookProc hook,

   311                     void*            callerdata)

   312 {

   313     JSD_LOCK();

   314     jsdc->toplevelHookData  = callerdata;

   315     jsdc->toplevelHook      = hook;

   316     JSD_UNLOCK();

   318     return true;

   319 }

   321 bool

   322 jsd_ClearTopLevelHook(JSDContext* jsdc)

   323 {

   324     JSD_LOCK();

   325     jsdc->toplevelHook      = nullptr;

   326     JSD_UNLOCK();

   328     return true;

   329 }

The Tor Browser / file revision

js/jsd/jsd_hook.cpp@6474c204b198

js/jsd/jsd_hook.cpp