Clean JS function results cache on each major GC.

src/objects-inl.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 551 matching lines @@
 bool Object::IsDictionary() {
   return IsHashTable() && this != Heap::symbol_table();
 }
 
 
 bool Object::IsSymbolTable() {
   return IsHashTable() && this == Heap::raw_unchecked_symbol_table();
 }
 
 
+bool Object::IsJSFunctionResultCache() {
+  if (!IsFixedArray()) return false;
+  FixedArray* self = FixedArray::cast(this);
+  int length = self->length();
+  if (length < JSFunctionResultCache::kEntriesIndex) return false;
+  if ((length - JSFunctionResultCache::kEntriesIndex)
+      % JSFunctionResultCache::kEntrySize != 0) {
+    return false;
+  }
+#ifdef DEBUG
+  reinterpret_cast<JSFunctionResultCache*>(this)->JSFunctionResultCacheVerify();
+#endif
+  return true;
+}
+
+
 bool Object::IsCompilationCacheTable() {
   return IsHashTable();
 }
 
 
 bool Object::IsCodeCacheHashTable() {
   return IsHashTable();
 }
 
 
@@ skipping 1005 matching lines @@
 }
 
 
 // ------------------------------------
 // Cast operations
 
 
 CAST_ACCESSOR(FixedArray)
 CAST_ACCESSOR(DescriptorArray)
 CAST_ACCESSOR(SymbolTable)
+CAST_ACCESSOR(JSFunctionResultCache)
 CAST_ACCESSOR(CompilationCacheTable)
 CAST_ACCESSOR(CodeCacheHashTable)
 CAST_ACCESSOR(MapCache)
 CAST_ACCESSOR(String)
 CAST_ACCESSOR(SeqString)
 CAST_ACCESSOR(SeqAsciiString)
 CAST_ACCESSOR(SeqTwoByteString)
 CAST_ACCESSOR(ConsString)
 CAST_ACCESSOR(ExternalString)
 CAST_ACCESSOR(ExternalAsciiString)
@@ skipping 224 matching lines @@
   return *reinterpret_cast<Resource**>(FIELD_ADDR(this, kResourceOffset));
 }
 
 
 void ExternalTwoByteString::set_resource(
     ExternalTwoByteString::Resource* resource) {
   *reinterpret_cast<Resource**>(FIELD_ADDR(this, kResourceOffset)) = resource;
 }
 
 
+void JSFunctionResultCache::MakeZeroSize() {
+  set(kFingerIndex, Smi::FromInt(kEntriesIndex));
+  set(kCacheSizeIndex, Smi::FromInt(kEntriesIndex));
+}
+
+
+void JSFunctionResultCache::Clear() {
+  int cache_size = Smi::cast(get(kCacheSizeIndex))->value();
+  Object** entries_start = RawField(this, OffsetOfElementAt(kEntriesIndex));
+  MemsetPointer(entries_start, Heap::the_hole_value(), cache_size);
+  MakeZeroSize();
+}
+
+
 byte ByteArray::get(int index) {
   ASSERT(index >= 0 && index < this->length());
   return READ_BYTE_FIELD(this, kHeaderSize + index * kCharSize);
 }
 
 
 void ByteArray::set(int index, byte value) {
   ASSERT(index >= 0 && index < this->length());
   WRITE_BYTE_FIELD(this, kHeaderSize + index * kCharSize, value);
 }
@@ skipping 1271 matching lines @@
 #undef WRITE_INT_FIELD
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_