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1 // Copyright 2006-2008 the V8 project authors. All rights reserved. | 1 // Copyright 2006-2008 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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193 V(global_eval_symbol, "GlobalEval") \ | 193 V(global_eval_symbol, "GlobalEval") \ |
194 V(identity_hash_symbol, "v8::IdentityHash") \ | 194 V(identity_hash_symbol, "v8::IdentityHash") \ |
195 V(closure_symbol, "(closure)") | 195 V(closure_symbol, "(closure)") |
196 | 196 |
197 | 197 |
198 // Forward declaration of the GCTracer class. | 198 // Forward declaration of the GCTracer class. |
199 class GCTracer; | 199 class GCTracer; |
200 class HeapStats; | 200 class HeapStats; |
201 | 201 |
202 | 202 |
203 typedef String* (*ExternalStringTableUpdaterCallback)(Object** pointer); | |
204 | |
205 | |
206 // The all static Heap captures the interface to the global object heap. | 203 // The all static Heap captures the interface to the global object heap. |
207 // All JavaScript contexts by this process share the same object heap. | 204 // All JavaScript contexts by this process share the same object heap. |
208 | 205 |
209 class Heap : public AllStatic { | 206 class Heap : public AllStatic { |
210 public: | 207 public: |
211 // Configure heap size before setup. Return false if the heap has been | 208 // Configure heap size before setup. Return false if the heap has been |
212 // setup already. | 209 // setup already. |
213 static bool ConfigureHeap(int max_semispace_size, int max_old_gen_size); | 210 static bool ConfigureHeap(int max_semispace_size, int max_old_gen_size); |
214 static bool ConfigureHeapDefault(); | 211 static bool ConfigureHeapDefault(); |
215 | 212 |
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940 | 937 |
941 static Object* NumberToString(Object* number, | 938 static Object* NumberToString(Object* number, |
942 bool check_number_string_cache = true); | 939 bool check_number_string_cache = true); |
943 | 940 |
944 static Map* MapForExternalArrayType(ExternalArrayType array_type); | 941 static Map* MapForExternalArrayType(ExternalArrayType array_type); |
945 static RootListIndex RootIndexForExternalArrayType( | 942 static RootListIndex RootIndexForExternalArrayType( |
946 ExternalArrayType array_type); | 943 ExternalArrayType array_type); |
947 | 944 |
948 static void RecordStats(HeapStats* stats); | 945 static void RecordStats(HeapStats* stats); |
949 | 946 |
950 // Copy block of memory from src to dst. Size of block should be aligned | |
951 // by pointer size. | |
952 static inline void CopyBlock(Object** dst, Object** src, int byte_size); | |
953 | |
954 // Optimized version of memmove for blocks with pointer size aligned sizes and | |
955 // pointer size aligned addresses. | |
956 static inline void MoveBlock(Object** dst, Object** src, size_t byte_size); | |
957 | |
958 // Check new space expansion criteria and expand semispaces if it was hit. | |
959 static void CheckNewSpaceExpansionCriteria(); | |
960 | |
961 static inline void IncrementYoungSurvivorsCounter(int survived) { | |
962 survived_since_last_expansion_ += survived; | |
963 } | |
964 | |
965 static void UpdateNewSpaceReferencesInExternalStringTable( | |
966 ExternalStringTableUpdaterCallback updater_func); | |
967 | |
968 // Helper function that governs the promotion policy from new space to | |
969 // old. If the object's old address lies below the new space's age | |
970 // mark or if we've already filled the bottom 1/16th of the to space, | |
971 // we try to promote this object. | |
972 static inline bool ShouldBePromoted(Address old_address, int object_size); | |
973 | |
974 static int MaxObjectSizeInNewSpace() { return kMaxObjectSizeInNewSpace; } | 947 static int MaxObjectSizeInNewSpace() { return kMaxObjectSizeInNewSpace; } |
975 | 948 |
976 private: | 949 private: |
977 static int reserved_semispace_size_; | 950 static int reserved_semispace_size_; |
978 static int max_semispace_size_; | 951 static int max_semispace_size_; |
979 static int initial_semispace_size_; | 952 static int initial_semispace_size_; |
980 static int max_old_generation_size_; | 953 static int max_old_generation_size_; |
981 static size_t code_range_size_; | 954 static size_t code_range_size_; |
982 | 955 |
983 // For keeping track of how much data has survived | 956 // For keeping track of how much data has survived |
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1160 | 1133 |
1161 static Object* CreateOddball(Map* map, | 1134 static Object* CreateOddball(Map* map, |
1162 const char* to_string, | 1135 const char* to_string, |
1163 Object* to_number); | 1136 Object* to_number); |
1164 | 1137 |
1165 // Allocate empty fixed array. | 1138 // Allocate empty fixed array. |
1166 static Object* AllocateEmptyFixedArray(); | 1139 static Object* AllocateEmptyFixedArray(); |
1167 | 1140 |
1168 // Performs a minor collection in new generation. | 1141 // Performs a minor collection in new generation. |
1169 static void Scavenge(); | 1142 static void Scavenge(); |
1170 | 1143 static void ScavengeExternalStringTable(); |
1171 static String* UpdateNewSpaceReferenceInExternalStringTableEntry( | |
1172 Object** pointer); | |
1173 | |
1174 static Address DoScavenge(ObjectVisitor* scavenge_visitor, | 1144 static Address DoScavenge(ObjectVisitor* scavenge_visitor, |
1175 Address new_space_front); | 1145 Address new_space_front); |
1176 | 1146 |
1177 // Performs a major collection in the whole heap. | 1147 // Performs a major collection in the whole heap. |
1178 static void MarkCompact(GCTracer* tracer); | 1148 static void MarkCompact(GCTracer* tracer); |
1179 | 1149 |
1180 // Code to be run before and after mark-compact. | 1150 // Code to be run before and after mark-compact. |
1181 static void MarkCompactPrologue(bool is_compacting); | 1151 static void MarkCompactPrologue(bool is_compacting); |
1182 static void MarkCompactEpilogue(bool is_compacting); | 1152 static void MarkCompactEpilogue(bool is_compacting); |
1183 | 1153 |
1184 // Helper function used by CopyObject to copy a source object to an | 1154 // Helper function used by CopyObject to copy a source object to an |
1185 // allocated target object and update the forwarding pointer in the source | 1155 // allocated target object and update the forwarding pointer in the source |
1186 // object. Returns the target object. | 1156 // object. Returns the target object. |
1187 static inline HeapObject* MigrateObject(HeapObject* source, | 1157 static inline HeapObject* MigrateObject(HeapObject* source, |
1188 HeapObject* target, | 1158 HeapObject* target, |
1189 int size); | 1159 int size); |
1190 | 1160 |
| 1161 // Helper function that governs the promotion policy from new space to |
| 1162 // old. If the object's old address lies below the new space's age |
| 1163 // mark or if we've already filled the bottom 1/16th of the to space, |
| 1164 // we try to promote this object. |
| 1165 static inline bool ShouldBePromoted(Address old_address, int object_size); |
1191 #if defined(DEBUG) || defined(ENABLE_LOGGING_AND_PROFILING) | 1166 #if defined(DEBUG) || defined(ENABLE_LOGGING_AND_PROFILING) |
1192 // Record the copy of an object in the NewSpace's statistics. | 1167 // Record the copy of an object in the NewSpace's statistics. |
1193 static void RecordCopiedObject(HeapObject* obj); | 1168 static void RecordCopiedObject(HeapObject* obj); |
1194 | 1169 |
1195 // Record statistics before and after garbage collection. | 1170 // Record statistics before and after garbage collection. |
1196 static void ReportStatisticsBeforeGC(); | 1171 static void ReportStatisticsBeforeGC(); |
1197 static void ReportStatisticsAfterGC(); | 1172 static void ReportStatisticsAfterGC(); |
1198 #endif | 1173 #endif |
1199 | 1174 |
1200 // Rebuild remembered set in an old space. | 1175 // Rebuild remembered set in an old space. |
1201 static void RebuildRSets(PagedSpace* space); | 1176 static void RebuildRSets(PagedSpace* space); |
1202 | 1177 |
1203 // Rebuild remembered set in the large object space. | 1178 // Rebuild remembered set in the large object space. |
1204 static void RebuildRSets(LargeObjectSpace* space); | 1179 static void RebuildRSets(LargeObjectSpace* space); |
1205 | 1180 |
1206 // Slow part of scavenge object. | 1181 // Slow part of scavenge object. |
1207 static void ScavengeObjectSlow(HeapObject** p, HeapObject* object); | 1182 static void ScavengeObjectSlow(HeapObject** p, HeapObject* object); |
1208 | 1183 |
| 1184 // Copy memory from src to dst. |
| 1185 static inline void CopyBlock(Object** dst, Object** src, int byte_size); |
| 1186 |
1209 // Initializes a function with a shared part and prototype. | 1187 // Initializes a function with a shared part and prototype. |
1210 // Returns the function. | 1188 // Returns the function. |
1211 // Note: this code was factored out of AllocateFunction such that | 1189 // Note: this code was factored out of AllocateFunction such that |
1212 // other parts of the VM could use it. Specifically, a function that creates | 1190 // other parts of the VM could use it. Specifically, a function that creates |
1213 // instances of type JS_FUNCTION_TYPE benefit from the use of this function. | 1191 // instances of type JS_FUNCTION_TYPE benefit from the use of this function. |
1214 // Please note this does not perform a garbage collection. | 1192 // Please note this does not perform a garbage collection. |
1215 static inline Object* InitializeFunction(JSFunction* function, | 1193 static inline Object* InitializeFunction(JSFunction* function, |
1216 SharedFunctionInfo* shared, | 1194 SharedFunctionInfo* shared, |
1217 Object* prototype); | 1195 Object* prototype); |
1218 | 1196 |
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1828 | 1806 |
1829 // To speed up scavenge collections new space string are kept | 1807 // To speed up scavenge collections new space string are kept |
1830 // separate from old space strings. | 1808 // separate from old space strings. |
1831 static List<Object*> new_space_strings_; | 1809 static List<Object*> new_space_strings_; |
1832 static List<Object*> old_space_strings_; | 1810 static List<Object*> old_space_strings_; |
1833 }; | 1811 }; |
1834 | 1812 |
1835 } } // namespace v8::internal | 1813 } } // namespace v8::internal |
1836 | 1814 |
1837 #endif // V8_HEAP_H_ | 1815 #endif // V8_HEAP_H_ |
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