1 | /*
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2 | このファイルでは、ABのガベージコレクションの実装を行います。
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3 | */
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4 |
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5 |
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6 | /*
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7 | ※これらの変数はコンパイラが自動的に定義します。
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8 | Dim _System_gc_GlobalRoot_StartPtr As VoidPtr
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9 | Dim _System_gc_GlobalRoot_Size As Long
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10 | Dim _System_gc_StackRoot_StartPtr As VoidPtr
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11 | */
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12 |
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13 | Function _System_GetSp() As LONG_PTR 'dummy
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14 | End Function
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15 |
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16 |
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17 | Const _System_GC_FLAG_ATOMIC = 1
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18 | Const _System_GC_FLAG_NEEDFREE = 2
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19 | Const _System_GC_FLAG_INITZERO = 4
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20 | Const _System_GC_FLAG_OBJECT = 8
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21 |
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22 | Type _System_GlobalRoot
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23 | ptr As *LONG_PTR
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24 | count As Long
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25 | End Type
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26 |
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27 | Class _System_CGarbageCollection
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28 | ppPtr As *VoidPtr
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29 | pSize As *SIZE_T
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30 | pdwFlags As *DWord
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31 | n As Long
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32 |
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33 | iAllSize As SIZE_T
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34 |
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35 | isSweeping As Boolean
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36 |
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37 | CriticalSection As CRITICAL_SECTION
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38 |
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39 | ' メモリの上限値(この値を超えるとGCが発動します)
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40 | limitMemorySize As LONG_PTR ' バイト単位
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41 | limitMemoryObjectNum As Long ' メモリオブジェクトの個数単位
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42 |
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43 | isFinish As Boolean
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44 |
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45 |
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46 | ' Global Root
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47 | pGlobalRoots As *_System_GlobalRoot
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48 | globalRootNum As Long
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49 | Sub AddGlobalRootPtr( ptr As *LONG_PTR, count As Long )
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50 | pGlobalRoots = _System_realloc( pGlobalRoots, (globalRootNum + 1) * SizeOf(_System_GlobalRoot) )
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51 | pGlobalRoots[globalRootNum].ptr = ptr
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52 | pGlobalRoots[globalRootNum].count = count
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53 | globalRootNum++
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54 | End Sub
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55 |
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56 | Sub RegisterGlobalRoots()
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57 | ' このメソッドの実装はコンパイラが自動生成する
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58 |
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59 | ' AddGlobalRootPtr(...)
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60 | ' ...
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61 | End Sub
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62 |
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63 | ' 特殊クラスのため、コンストラクタ・デストラクタは呼ばれません
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64 | Sub _System_CGarbageCollection()
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65 | End Sub
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66 | Sub ~_System_CGarbageCollection()
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67 | End Sub
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68 |
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69 | Public
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70 |
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71 | Sub Begin()
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72 | If ppPtr Then Exit Sub
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73 |
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74 | isFinish = False
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75 |
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76 | 'メモリの上限値(この値を超えるとGCが発動します)
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77 | limitMemorySize = 1024*1024 As LONG_PTR ' バイト単位
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78 | limitMemoryObjectNum = 2000 ' メモリオブジェクトの個数単位
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79 |
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80 | ppPtr=_System_calloc( 1 )
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81 | pSize=_System_calloc( 1 )
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82 | pdwFlags=_System_calloc( 1 )
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83 | n=0
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84 |
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85 | ' Global Root
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86 | pGlobalRoots = _System_calloc( 1 )
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87 | globalRootNum = 0
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88 | RegisterGlobalRoots()
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89 |
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90 | iAllSize=0
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91 |
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92 | ' スウィープ中かどうか
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93 | isSweeping = False
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94 |
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95 | 'クリティカルセッションを生成
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96 | InitializeCriticalSection(CriticalSection)
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97 |
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98 |
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99 | '---------------------------
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100 | ' 開始時のスレッドを通知
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101 | '---------------------------
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102 | Dim hTargetThread As HANDLE
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103 | DuplicateHandle(GetCurrentProcess(),
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104 | GetCurrentThread(),
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105 | GetCurrentProcess(),
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106 | hTargetThread, 0, FALSE, DUPLICATE_SAME_ACCESS) 'カレントスレッドのハンドルを複製
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107 |
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108 | ' スレッド管理用オブジェクトを生成
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109 | _System_pobj_AllThreads = New _System_CThreadCollection()
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110 |
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111 | ' 自身のThreadオブジェクトを生成
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112 | Dim thread As Thread(hTargetThread,GetCurrentThreadId(),0)
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113 |
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114 | _System_pobj_AllThreads->BeginThread(VarPtr( thread ),_System_gc_StackRoot_StartPtr As *LONG_PTR)
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115 |
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116 | End Sub
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117 | Sub Finish()
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118 | If ppPtr=0 Then Exit Sub
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119 |
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120 | isFinish = True
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121 |
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122 | ' スレッド管理用オブジェクトを破棄
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123 | Delete _System_pobj_AllThreads
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124 |
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125 | ' 自分以外のスレッドを一時停止
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126 | '_System_pobj_AllThreads->SuspendAnotherThread()
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127 |
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128 | OutputDebugString( Ex"garbage colletion sweeping all memory objects!\r\n" )
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129 | DeleteAllGarbageMemories()
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130 |
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131 | ' 未解放のメモリオブジェクトをトレース
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132 | DumpMemoryLeaks()
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133 |
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134 | ' 自分以外のスレッドを再開
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135 | '_System_pobj_AllThreads->ResumeAnotherThread()
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136 |
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137 | _System_free( ppPtr )
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138 | ppPtr = NULL
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139 |
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140 | _System_free( pSize )
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141 | pSize = NULL
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142 | _System_free( pdwFlags )
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143 | pdwFlags = NULL
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144 |
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145 | _System_free( pGlobalRoots )
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146 | pGlobalRoots = NULL
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147 |
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148 | 'クリティカルセッションを破棄
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149 | DeleteCriticalSection(CriticalSection)
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150 |
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151 | End Sub
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152 |
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153 | Sub add(new_ptr As VoidPtr, size As SIZE_T, flags As DWord)
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154 | iAllSize+=size
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155 |
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156 | EnterCriticalSection(CriticalSection)
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157 | ppPtr=HeapReAlloc(_System_hProcessHeap,0,ppPtr,(n+1)*SizeOf(VoidPtr))
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158 | ppPtr[n]=new_ptr
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159 |
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160 | pSize=HeapReAlloc(_System_hProcessHeap,0,pSize,(n+1)*SizeOf(SIZE_T))
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161 | pSize[n]=size
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162 |
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163 | pdwFlags=HeapReAlloc(_System_hProcessHeap,0,pdwFlags,(n+1)*SizeOf(DWord))
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164 | pdwFlags[n]=flags
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165 | LeaveCriticalSection(CriticalSection)
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166 |
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167 | n++
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168 | End Sub
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169 |
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170 |
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171 | Function __malloc(size As SIZE_T,flags As Byte) As VoidPtr
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172 | ' EnterCriticalSection(CriticalSection)
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173 | Dim dwFlags As DWord
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174 | If flags and _System_GC_FLAG_INITZERO Then
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175 | dwFlags=HEAP_ZERO_MEMORY
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176 | Else
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177 | dwFlags=0
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178 | End If
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179 |
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180 | Dim ptr = HeapAlloc(_System_hProcessHeap,dwFlags,size)
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181 | add( ptr, size, flags )
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182 | ' LeaveCriticalSection(CriticalSection)
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183 |
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184 | Return ptr
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185 | End Function
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186 |
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187 | Function __realloc(lpMem As VoidPtr, size As SIZE_T) As VoidPtr
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188 | EnterCriticalSection(CriticalSection)
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189 | Dim i As Long
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190 | For i=0 To ELM(n)
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191 | If ppPtr[i]=lpMem Then
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192 | iAllSize+=size-pSize[i]
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193 |
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194 | pSize[i]=size
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195 | ppPtr[i]=HeapReAlloc(_System_hProcessHeap,HEAP_ZERO_MEMORY,lpMem,size)
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196 |
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197 | LeaveCriticalSection(CriticalSection)
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198 | Return ppPtr[i]
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199 | End If
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200 | Next
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201 | LeaveCriticalSection(CriticalSection)
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202 | Return 0
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203 | End Function
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204 |
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205 | Sub __free_ex(lpMem As VoidPtr, isSweeping As Boolean)
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206 | EnterCriticalSection(CriticalSection)
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207 | Dim i As Long
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208 | For i=0 To ELM(n)
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209 | If ppPtr[i]=lpMem Then
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210 | If (pdwFlags[i] and _System_GC_FLAG_NEEDFREE)<>0 or isSweeping Then
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211 | iAllSize-=pSize[i]
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212 |
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213 | HeapFree(_System_hProcessHeap,0,ppPtr[i])
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214 | ppPtr[i]=0
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215 | pSize[i]=0
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216 | Else
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217 | If isFinish = False Then
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218 | OutputDebugString( Ex"heap free missing!\r\n" )
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219 | End If
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220 | End If
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221 | End If
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222 | Next
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223 | LeaveCriticalSection(CriticalSection)
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224 | End Sub
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225 |
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226 | Sub __free(lpMem As VoidPtr)
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227 | __free_ex( lpMem, False )
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228 | End Sub
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229 |
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230 | Sub sweep()
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231 | If isSweeping <> False or (iAllSize<limitMemorySize and n<limitMemoryObjectNum) Then
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232 | 'メモリ使用量が上限値を超えていないとき
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233 | Exit Sub
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234 | End If
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235 |
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236 | Dim hThread As HANDLE
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237 | Dim ThreadId As DWord
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238 | hThread=_beginthreadex(NULL,0,AddressOf(SweepOnOtherThread),VarPtr(This),0,ThreadId)
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239 | WaitForSingleObject(hThread,INFINITE)
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240 | CloseHandle(hThread)
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241 | isSweeping = False
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242 | End Sub
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243 |
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244 | Private
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245 |
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246 | Static Function IsNull( object As Object ) As Boolean
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247 | If VarPtr( object ) = NULL Then
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248 | Return True
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249 | End If
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250 | Return False
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251 | End Function
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252 |
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253 | ' 生存検知
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254 | Function HitTest(pSample As VoidPtr) As Long
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255 | Dim i As Long
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256 | For i=0 To ELM(n)
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257 | If (ppPtr[i] As LONG_PTR)<=(pSample As LONG_PTR) and (pSample As LONG_PTR)<((ppPtr[i] As LONG_PTR)+pSize[i]) Then
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258 | Return i
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259 | End If
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260 | Next
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261 | Return -1
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262 | End Function
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263 |
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264 | ' オブジェクトのスキャン
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265 | Function ScanObject(pObject As *Object, pbMark As *Byte) As Boolean
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266 | Dim classTypeInfo = Nothing As _System_TypeForClass
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267 | classTypeInfo = pObject->GetType() As _System_TypeForClass
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268 |
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269 | If IsNull( classTypeInfo ) Then
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270 | Return False
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271 | End If
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272 |
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273 | Dim i As Long
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274 | For i = 0 To ELM(classTypeInfo.numOfReference)
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275 | Scan( (pObject + classTypeInfo.referenceOffsets[i]) As *LONG_PTR, 1, pbMark )
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276 | Next
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277 |
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278 | Return True
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279 | End Function
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280 |
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281 | ' 指定領域のスキャン
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282 | Sub Scan(pStartPtr As *LONG_PTR, maxNum As Long, pbMark As *Byte)
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283 | Dim i As Long, index As Long
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284 |
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285 | For i=0 To ELM(maxNum)
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286 | index=HitTest(pStartPtr[i] As VoidPtr)
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287 | If index<>-1 Then
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288 | If pbMark[index]=0 Then
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289 | pbMark[index]=1
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290 |
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291 | If pdwFlags[index] and _System_GC_FLAG_OBJECT Then
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292 | ' オブジェクトの場合
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293 | If ScanObject( (ppPtr[index] + 3*SizeOf(LONG_PTR)) As *Object, pbMark) = False Then
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294 | Dim maxNum = (pSize[index]\SizeOf(LONG_PTR)) As Long
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295 | Scan(ppPtr[index] As *LONG_PTR, maxNum, pbMark)
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296 | End If
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297 |
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298 | ElseIf (pdwFlags[index] and _System_GC_FLAG_ATOMIC)=0 Then
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299 | ' ヒープ領域がポインタ値を含む可能性があるとき
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300 | If ppPtr[index] = 0 Then
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301 | 'エラー
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302 |
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303 | End If
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304 |
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305 | Dim maxNum = (pSize[index]\SizeOf(LONG_PTR)) As Long
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306 | Scan(ppPtr[index] As *LONG_PTR, maxNum, pbMark)
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307 | End If
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308 | End If
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309 | End If
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310 | Next
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311 | End Sub
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312 |
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313 | ' ローカル領域をルートに指定してスキャン
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314 | Sub LocalScan( pbMark As *Byte )
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315 | Dim Context As CONTEXT
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316 | Dim NowSp As *LONG_PTR
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317 | Dim size As LONG_PTR
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318 | Dim i As Long
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319 | For i=0 To ELM(_System_pobj_AllThreads->ThreadNum)
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320 | If _System_pobj_AllThreads->ppobj_Thread[i] Then
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321 | FillMemory(VarPtr(Context),SizeOf(CONTEXT),0)
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322 | Context.ContextFlags=CONTEXT_CONTROL
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323 | If _System_pobj_AllThreads->ppobj_Thread[i]->__GetContext(Context)=0 Then
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324 | OutputDebugString(Ex"レジスタ情報の取得に失敗しました。\r\n")
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325 | End If
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326 |
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327 | #ifdef _WIN64
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328 | NowSp=Context.Rsp As *LONG_PTR
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329 | #else
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330 | NowSp=Context.Esp As *LONG_PTR
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331 | #endif
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332 |
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333 | Dim size=(_System_pobj_AllThreads->pStackBase[i] As LONG_PTR)-(NowSp As LONG_PTR)
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334 | Dim maxNum = (size\SizeOf(LONG_PTR)) As Long
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335 |
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336 | If NowSp = 0 Then
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337 | debug
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338 | Exit Sub
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339 | End If
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340 |
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341 | Scan( NowSp, maxNum, pbMark )
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342 | End If
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343 | Next
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344 | End Sub
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345 |
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346 | Sub DeleteGarbageMemories( pbMark As *Byte )
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347 |
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348 | Dim isAllDelete = False
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349 | If pbMark = NULL Then
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350 | ' すべてを破棄するとき
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351 | isAllDelete = True
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352 | pbMark = _System_calloc( n )
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353 | End If
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354 |
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355 | Dim i As Long
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356 | For i=0 To ELM(n)
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357 | If pbMark[i]=0 and ppPtr[i]<>0 and (pdwFlags[i] and _System_GC_FLAG_NEEDFREE)=0 Then
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358 | If ppPtr[i] = 0 Then
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359 | If isAllDelete Then
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360 | Continue
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361 | Else
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362 | debug
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363 | End If
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364 | End If
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365 |
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366 | Dim ptr = ppPtr[i]
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367 | Dim size = pSize[i]
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368 |
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369 | ppPtr[i]=0
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370 | pSize[i]=0
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371 |
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372 | If (pdwFlags[i] and _System_GC_FLAG_OBJECT) <> 0 Then
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373 | /* ・オブジェクトの個数
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374 | ・オブジェクトのサイズ
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375 | ・デストラクタの関数ポインタ
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376 | を考慮 */
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377 | _System_SweepingDelete (ptr + SizeOf( LONG_PTR ) * 3 )
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378 | Else
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379 | HeapFree(_System_hProcessHeap,0,ptr)
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380 | End If
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381 |
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382 | iAllSize-=size
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383 | End If
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384 | Next
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385 |
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386 | If isAllDelete Then
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387 | _System_free( pbMark )
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388 | End If
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389 |
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390 | End Sub
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391 |
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392 | Sub DeleteAllGarbageMemories()
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393 | DeleteGarbageMemories( NULL )
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394 | End Sub
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395 |
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396 | Sub Compaction()
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397 | Dim i As Long, i2 = 0 As Long
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398 | For i=0 To ELM(n)
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399 | ppPtr[i2] = ppPtr[i]
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400 | pSize[i2] = pSize[i]
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401 | pdwFlags[i2] = pdwFlags[i]
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402 |
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403 | If ppPtr[i] Then
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404 | i2++
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405 | End If
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406 | Next
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407 | n = i2
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408 | End Sub
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409 |
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410 | ' スウィープ(新規スレッドで呼び出し)
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411 | Function Cdecl SweepOnOtherThread() As Long
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412 | EnterCriticalSection(CriticalSection)
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413 |
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414 |
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415 | Dim startTime = GetTickCount()
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416 |
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417 | OutputDebugString( Ex"garbage colletion sweep start!\r\n" )
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418 |
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419 |
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420 | If isSweeping <> False or (iAllSize<limitMemorySize and n<limitMemoryObjectNum) Then
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421 | ExitThread(0)
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422 | End If
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423 | isSweeping = True
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424 |
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425 | ' すべてのスレッドを一時停止
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426 | _System_pobj_AllThreads->SuspendAllThread()
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427 |
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428 | ' マークリストを生成
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429 | Dim pbMark = HeapAlloc(_System_hProcessHeap,HEAP_ZERO_MEMORY,n*SizeOf(Byte)) As *Byte
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430 |
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431 | ' グローバル領域をルートに指定してスキャン
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432 | Dim i As Long
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433 | For i = 0 To ELM( globalRootNum )
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434 | Scan( pGlobalRoots[i].ptr, pGlobalRoots[i].count, pbMark )
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435 | Next
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436 |
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437 | ' ローカル領域をルートに指定してスキャン
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438 | LocalScan( pbMark )
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439 |
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440 | ' スウィープ前のメモリサイズを退避
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441 | Dim iBackAllSize = iAllSize
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442 |
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443 | ' スウィープ前のメモリオブジェクトの数
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444 | Dim iBeforeN = n
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445 |
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446 | '使われていないメモリを解放する
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447 | DeleteGarbageMemories(pbMark)
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448 |
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449 | 'コンパクション
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450 | Compaction()
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451 |
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452 | 'マークリストを解放
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453 | HeapFree(_System_hProcessHeap,0,pbMark)
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454 |
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455 | If iBackAllSize=iAllSize Then
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456 | If iAllSize > limitMemorySize Then
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457 | limitMemorySize = iAllSize
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458 | End If
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459 |
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460 | '許容量を拡張する
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461 | limitMemorySize *= 2
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462 | limitMemoryObjectNum *= 2
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463 |
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464 | OutputDebugString( Ex"memory size is extended for gc!\r\n" )
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465 | End If
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466 |
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467 | Dim temp[100] As Char
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468 | wsprintf(temp,Ex"object items ... %d -> %d ( %d MB -> %d MB )\r\n",iBeforeN,n, iBackAllSize\1024\1024, iAllSize\1024\1024)
|
---|
469 | OutputDebugString( temp )
|
---|
470 | wsprintf(temp,Ex"limit size of memory ... %d\r\n",limitMemorySize)
|
---|
471 | OutputDebugString( temp )
|
---|
472 | wsprintf(temp,Ex"garbage colletion sweep finish! (%d ms)\r\n\r\n", GetTickCount()-startTime)
|
---|
473 | OutputDebugString( temp )
|
---|
474 |
|
---|
475 |
|
---|
476 | '-------------------------------------
|
---|
477 | ' すべてのスレッドを再開
|
---|
478 | '-------------------------------------
|
---|
479 | _System_pobj_AllThreads->ResumeAllThread()
|
---|
480 |
|
---|
481 | LeaveCriticalSection(CriticalSection)
|
---|
482 | End Function
|
---|
483 |
|
---|
484 | ' 未解放のメモリオブジェクトをトレース
|
---|
485 | Sub DumpMemoryLeaks()
|
---|
486 | Dim isLeak = False
|
---|
487 | Dim i As Long
|
---|
488 | For i=0 To ELM(n)
|
---|
489 | If ppPtr[i] Then
|
---|
490 | If (pdwFlags[i] and _System_GC_FLAG_NEEDFREE)<>0 Then
|
---|
491 | If isLeak = False Then
|
---|
492 | OutputDebugString( Ex"Detected memory leaks!\r\n" )
|
---|
493 | isLeak = True
|
---|
494 | End If
|
---|
495 |
|
---|
496 | Dim temp[100] As Char
|
---|
497 | OutputDebugString( Ex"heap free missing!\r\n" )
|
---|
498 | wsprintf(temp,Ex"{%d} normal block at &H%08X, %d bytes long.\r\n", i, ppPtr[i], pSize[i])
|
---|
499 | OutputDebugString( temp )
|
---|
500 | End If
|
---|
501 | End If
|
---|
502 | Next
|
---|
503 |
|
---|
504 | If isLeak Then
|
---|
505 | OutputDebugString( Ex"Object dump complete.\r\n" )
|
---|
506 | End If
|
---|
507 |
|
---|
508 | End Sub
|
---|
509 |
|
---|
510 | End Class
|
---|
511 |
|
---|
512 | 'GC管理用の特殊なシステムオブジェクト(デストラクタは最終のタイミングで呼び出されます)
|
---|
513 | Dim _System_pGC As *_System_CGarbageCollection
|
---|
514 |
|
---|
515 |
|
---|
516 |
|
---|
517 | Function GC_malloc(size As Long) As VoidPtr
|
---|
518 | ' sweep
|
---|
519 | _System_pGC->sweep()
|
---|
520 |
|
---|
521 | 'allocate
|
---|
522 | Return _System_pGC->__malloc(size,0)
|
---|
523 | End Function
|
---|
524 |
|
---|
525 | Function GC_malloc_atomic(size As Long) As VoidPtr
|
---|
526 | ' sweep
|
---|
527 | _System_pGC->sweep()
|
---|
528 |
|
---|
529 | 'allocate
|
---|
530 | Return _System_pGC->__malloc(size,_System_GC_FLAG_ATOMIC)
|
---|
531 | End Function
|
---|
532 |
|
---|
533 | Function _System_GC_malloc_ForObject(size As Long) As VoidPtr
|
---|
534 | ' sweep
|
---|
535 | _System_pGC->sweep()
|
---|
536 |
|
---|
537 | 'allocate
|
---|
538 | Return _System_pGC->__malloc(size,_System_GC_FLAG_OBJECT or _System_GC_FLAG_INITZERO)
|
---|
539 | End Function
|
---|
540 |
|
---|
541 | Function _System_GC_malloc_ForObjectPtr(size As Long) As VoidPtr
|
---|
542 | ' sweep
|
---|
543 | _System_pGC->sweep()
|
---|
544 |
|
---|
545 | 'allocate
|
---|
546 | Return _System_pGC->__malloc(size,_System_GC_FLAG_OBJECT or _System_GC_FLAG_INITZERO or _System_GC_FLAG_NEEDFREE)
|
---|
547 | End Function
|
---|
548 |
|
---|
549 | Function _System_GC_free_for_SweepingDelete( ptr As *Object )
|
---|
550 | ' free
|
---|
551 | _System_pGC->__free_ex( ptr, True )
|
---|
552 | End Function
|
---|