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      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
     92