The Tor Browser: js/jsd/jsd_obj.cpp@a63d609f5ebe

     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 - Object support

     9  */

    11 #include "jsd.h"

    13 /*

    14 * #define JSD_TRACE 1

    15 */

    17 #ifdef JSD_TRACE

    18 #define TRACEOBJ(jsdc, jsdobj, which) _traceObj(jsdc, jsdobj, which)

    20 static char *

    21 _describeObj(JSDContext* jsdc, JSDObject *jsdobj)

    22 {

    23     return

    24         JS_smprintf("%0x new'd in %s at line %d using ctor %s in %s at line %d",

    25                     (int)jsdobj,

    26                     JSD_GetObjectNewURL(jsdc, jsdobj),

    27                     JSD_GetObjectNewLineNumber(jsdc, jsdobj),

    28                     JSD_GetObjectConstructorName(jsdc, jsdobj),

    29                     JSD_GetObjectConstructorURL(jsdc, jsdobj),

    30                     JSD_GetObjectConstructorLineNumber(jsdc, jsdobj));

    31 }

    33 static void

    34 _traceObj(JSDContext* jsdc, JSDObject* jsdobj, int which)

    35 {

    36     char* description;

    38     if( !jsdobj )

    39         return;

    41     description = _describeObj(jsdc, jsdobj);

    43     printf("%s : %s\n",

    44            which == 0 ? "new  " :

    45            which == 1 ? "final" :

    46                         "ctor ",

    47            description);

    48     if(description)

    49         free(description);

    50 }

    51 #else

    52 #define TRACEOBJ(jsdc, jsdobj, which) ((void)0)

    53 #endif /* JSD_TRACE */

    55 #ifdef DEBUG

    56 void JSD_ASSERT_VALID_OBJECT(JSDObject* jsdobj)

    57 {

    58     MOZ_ASSERT(jsdobj);

    59     MOZ_ASSERT(!JS_CLIST_IS_EMPTY(&jsdobj->links));

    60     MOZ_ASSERT(jsdobj->obj);

    61 }

    62 #endif

    65 static void

    66 _destroyJSDObject(JSDContext* jsdc, JSDObject* jsdobj)

    67 {

    68     MOZ_ASSERT(JSD_OBJECTS_LOCKED(jsdc));

    70     JS_REMOVE_LINK(&jsdobj->links);

    71     JS_HashTableRemove(jsdc->objectsTable, jsdobj->obj);

    73     if(jsdobj->newURL)

    74         jsd_DropAtom(jsdc, jsdobj->newURL);

    75     if(jsdobj->ctorURL)

    76         jsd_DropAtom(jsdc, jsdobj->ctorURL);

    77     if(jsdobj->ctorName)

    78         jsd_DropAtom(jsdc, jsdobj->ctorName);

    79     free(jsdobj);

    80 }

    82 void

    83 jsd_Constructing(JSDContext* jsdc, JSContext *cx, JSObject *obj,

    84                  JSAbstractFramePtr frame)

    85 {

    86     JSDObject* jsdobj;

    87     JS::RootedScript script(cx);

    88     JSDScript* jsdscript;

    89     const char* ctorURL;

    90     JSString* ctorNameStr;

    91     const char* ctorName;

    93     JSD_LOCK_OBJECTS(jsdc);

    94     jsdobj = jsd_GetJSDObjectForJSObject(jsdc, obj);

    95     if( jsdobj && !jsdobj->ctorURL )

    96     {

    97         script = frame.script();

    98         if( script )

    99         {

   100             ctorURL = JS_GetScriptFilename(script);

   101             if( ctorURL )

   102                 jsdobj->ctorURL = jsd_AddAtom(jsdc, ctorURL);

   104             JSD_LOCK_SCRIPTS(jsdc);

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

   106             JSD_UNLOCK_SCRIPTS(jsdc);

   107             if( jsdscript && (ctorNameStr = jsd_GetScriptFunctionId(jsdc, jsdscript)) ) {

   108                 if( (ctorName = JS_EncodeString(cx, ctorNameStr)) ) {

   109                     jsdobj->ctorName = jsd_AddAtom(jsdc, ctorName);

   110                     JS_free(cx, (void *) ctorName);

   111                 }

   112             }

   113             jsdobj->ctorLineno = JS_GetScriptBaseLineNumber(cx, script);

   114         }

   115     }

   116     TRACEOBJ(jsdc, jsdobj, 3);

   117     JSD_UNLOCK_OBJECTS(jsdc);

   118 }

   120 static JSHashNumber

   121 _hash_root(const void *key)

   122 {

   123     return ((JSHashNumber)(ptrdiff_t) key) >> 2; /* help lame MSVC1.5 on Win16 */

   124 }

   126 bool

   127 jsd_InitObjectManager(JSDContext* jsdc)

   128 {

   129     JS_INIT_CLIST(&jsdc->objectsList);

   130     jsdc->objectsTable = JS_NewHashTable(256, _hash_root,

   131                                          JS_CompareValues, JS_CompareValues,

   132                                          nullptr, nullptr);

   133     return !!jsdc->objectsTable;

   134 }

   136 void

   137 jsd_DestroyObjectManager(JSDContext* jsdc)

   138 {

   139     jsd_DestroyObjects(jsdc);

   140     JSD_LOCK_OBJECTS(jsdc);

   141     JS_HashTableDestroy(jsdc->objectsTable);

   142     JSD_UNLOCK_OBJECTS(jsdc);

   143 }

   145 void

   146 jsd_DestroyObjects(JSDContext* jsdc)

   147 {

   148     JSD_LOCK_OBJECTS(jsdc);

   149     while( !JS_CLIST_IS_EMPTY(&jsdc->objectsList) )

   150         _destroyJSDObject(jsdc, (JSDObject*)JS_NEXT_LINK(&jsdc->objectsList));

   151     JSD_UNLOCK_OBJECTS(jsdc);

   152 }

   154 JSDObject*

   155 jsd_IterateObjects(JSDContext* jsdc, JSDObject** iterp)

   156 {

   157     JSDObject *jsdobj = *iterp;

   159     MOZ_ASSERT(JSD_OBJECTS_LOCKED(jsdc));

   161     if( !jsdobj )

   162         jsdobj = (JSDObject *)jsdc->objectsList.next;

   163     if( jsdobj == (JSDObject *)&jsdc->objectsList )

   164         return nullptr;

   165     *iterp = (JSDObject*) jsdobj->links.next;

   166     return jsdobj;

   167 }

   169 JSObject*

   170 jsd_GetWrappedObject(JSDContext* jsdc, JSDObject* jsdobj)

   171 {

   172     return jsdobj->obj;

   173 }

   175 const char*

   176 jsd_GetObjectNewURL(JSDContext* jsdc, JSDObject* jsdobj)

   177 {

   178     if( jsdobj->newURL )

   179         return JSD_ATOM_TO_STRING(jsdobj->newURL);

   180     return nullptr;

   181 }

   183 unsigned

   184 jsd_GetObjectNewLineNumber(JSDContext* jsdc, JSDObject* jsdobj)

   185 {

   186     return jsdobj->newLineno;

   187 }

   189 const char*

   190 jsd_GetObjectConstructorURL(JSDContext* jsdc, JSDObject* jsdobj)

   191 {

   192     if( jsdobj->ctorURL )

   193         return JSD_ATOM_TO_STRING(jsdobj->ctorURL);

   194     return nullptr;

   195 }

   197 unsigned

   198 jsd_GetObjectConstructorLineNumber(JSDContext* jsdc, JSDObject* jsdobj)

   199 {

   200     return jsdobj->ctorLineno;

   201 }

   203 const char*

   204 jsd_GetObjectConstructorName(JSDContext* jsdc, JSDObject* jsdobj)

   205 {

   206     if( jsdobj->ctorName )

   207         return JSD_ATOM_TO_STRING(jsdobj->ctorName);

   208     return nullptr;

   209 }

   211 JSDObject*

   212 jsd_GetJSDObjectForJSObject(JSDContext* jsdc, JSObject* jsobj)

   213 {

   214     JSDObject* jsdobj;

   216     JSD_LOCK_OBJECTS(jsdc);

   217     jsdobj = (JSDObject*) JS_HashTableLookup(jsdc->objectsTable, jsobj);

   218     JSD_UNLOCK_OBJECTS(jsdc);

   219     return jsdobj;

   220 }

   222 JSDObject*

   223 jsd_GetObjectForValue(JSDContext* jsdc, JSDValue* jsdval)

   224 {

   225     return jsd_GetJSDObjectForJSObject(jsdc, JSVAL_TO_OBJECT(jsdval->val));

   226 }

   228 JSDValue*

   229 jsd_GetValueForObject(JSDContext* jsdc, JSDObject* jsdobj)

   230 {

   231     return jsd_NewValue(jsdc, OBJECT_TO_JSVAL(jsdobj->obj));

   232 }

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