1 /*

     2  * Copyright (C) 2009 Google Inc. All rights reserved.

     3  * 

     4  * Redistribution and use in source and binary forms, with or without

     5  * modification, are permitted provided that the following conditions are

     6  * met:

     7  * 

     8  *     * Redistributions of source code must retain the above copyright

     9  * notice, this list of conditions and the following disclaimer.

    10  *     * Redistributions in binary form must reproduce the above

    11  * copyright notice, this list of conditions and the following disclaimer

    12  * in the documentation and/or other materials provided with the

    13  * distribution.

    14  *     * Neither the name of Google Inc. nor the names of its

    15  * contributors may be used to endorse or promote products derived from

    16  * this software without specific prior written permission.

    17  * 

    18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

    19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

    20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

    21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

    22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

    23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

    24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

    25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

    26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

    27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

    28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    29  */

    30 

    31 #ifndef V8GCController_h

    32 #define V8GCController_h

    33 

    34 #include <v8.h>

    35 

    36 namespace WebCore {

    37 

    38 #ifndef NDEBUG

    39 

    40 #define GlobalHandleTypeList(V)   \

    41     V(PROXY)                      \

    42     V(NPOBJECT)                   \

    43     V(SCHEDULED_ACTION)           \

    44     V(EVENT_LISTENER)             \

    45     V(NODE_FILTER)                \

    46     V(SCRIPTINSTANCE)             \

    47     V(SCRIPTVALUE)                \

    48     V(DATASOURCE)

    49 

    50 

    51     // Host information of persistent handles.

    52     enum GlobalHandleType {

    53 #define ENUM(name) name,

    54         GlobalHandleTypeList(ENUM)

    55 #undef ENUM

    56     };

    57 

    58     class GlobalHandleInfo {

    59     public:

    60         GlobalHandleInfo(void* host, GlobalHandleType type) : m_host(host), m_type(type) { }

    61         void* m_host;

    62         GlobalHandleType m_type;

    63     };

    64 

    65 #endif // NDEBUG

    66 

    67     class V8GCController {

    68     public:

    69         // Protect/Unprotect JS wrappers of a DOM object.

    70         static void gcProtect(void* domObject);

    71         static void gcUnprotect(void* domObject);

    72 

    73 #ifndef NDEBUG

    74         // For debugging and leak detection purpose.

    75         static void registerGlobalHandle(GlobalHandleType, void*, v8::Persistent<v8::Value>);

    76         static void unregisterGlobalHandle(void*, v8::Persistent<v8::Value>);

    77 #endif

    78 

    79         static void gcPrologue();

    80         static void gcEpilogue();

    81 

    82         static void checkMemoryUsage();

    83 

    84     private:

    85         // Estimate of current working set.

    86         static int workingSetEstimateMB;

    87     };

    88 

    89 }

    90 

    91 #endif // V8GCController_h