runtime/SymbolTable.cpp

   1 /*
   2  * Copyright (C) 2012 Apple 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
   6  * are met:
   7  *
   8  * 1.  Redistributions of source code must retain the above copyright
   9  *     notice, this list of conditions and the following disclaimer.
  10  * 2.  Redistributions in binary form must reproduce the above copyright
  11  *     notice, this list of conditions and the following disclaimer in the
  12  *     documentation and/or other materials provided with the distribution.
  13  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
  14  *     its contributors may be used to endorse or promote products derived
  15  *     from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  18  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  20  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  22  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  23  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include "config.h"
  30 #include "SymbolTable.h"
  31
  32 namespace JSC {
  33
  34 const ClassInfo SharedSymbolTable::s_info = { "SharedSymbolTable", 0, 0, 0, CREATE_METHOD_TABLE(SharedSymbolTable) };
  35
  36 SymbolTableEntry& SymbolTableEntry::copySlow(const SymbolTableEntry& other)
  37 {
  38     ASSERT(other.isFat());
  39     FatEntry* newFatEntry = new FatEntry(*other.fatEntry());
  40     freeFatEntry();
  41     m_bits = bitwise_cast<intptr_t>(newFatEntry);
  42     return *this;
  43 }
  44
  45 void SharedSymbolTable::destroy(JSCell* cell)
  46 {
  47     SharedSymbolTable* thisObject = jsCast<SharedSymbolTable*>(cell);
  48     thisObject->SharedSymbolTable::~SharedSymbolTable();
  49 }
  50
  51 void SymbolTableEntry::freeFatEntrySlow()
  52 {
  53     ASSERT(isFat());
  54     delete fatEntry();
  55 }
  56
  57 bool SymbolTableEntry::couldBeWatched()
  58 {
  59     if (!isFat())
  60         return false;
  61     WatchpointSet* watchpoints = fatEntry()->m_watchpoints.get();
  62     if (!watchpoints)
  63         return false;
  64     return watchpoints->isStillValid();
  65 }
  66
  67 void SymbolTableEntry::attemptToWatch()
  68 {
  69     FatEntry* entry = inflate();
  70     if (!entry->m_watchpoints)
  71         entry->m_watchpoints = adoptRef(new WatchpointSet(InitializedWatching));
  72 }
  73
  74 bool* SymbolTableEntry::addressOfIsWatched()
  75 {
  76     ASSERT(couldBeWatched());
  77     return fatEntry()->m_watchpoints->addressOfIsWatched();
  78 }
  79
  80 void SymbolTableEntry::addWatchpoint(Watchpoint* watchpoint)
  81 {
  82     ASSERT(couldBeWatched());
  83     fatEntry()->m_watchpoints->add(watchpoint);
  84 }
  85
  86 void SymbolTableEntry::notifyWriteSlow()
  87 {
  88     WatchpointSet* watchpoints = fatEntry()->m_watchpoints.get();
  89     if (!watchpoints)
  90         return;
  91     watchpoints->notifyWrite();
  92 }
  93
  94 SymbolTableEntry::FatEntry* SymbolTableEntry::inflateSlow()
  95 {
  96     FatEntry* entry = new FatEntry(m_bits);
  97     m_bits = bitwise_cast<intptr_t>(entry);
  98     return entry;
  99 }
 100
 101 } // namespace JSC
 102