Introduce mechanism to record an allocation of a class

runtime/vm/object.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 1345 matching lines @@
   // Register code that has used CHA for optimization.
   // TODO(srdjan): Also register kind of CHA optimization (e.g.: leaf class,
   // leaf method, ...).
   void RegisterCHACode(const Code& code);
 
   void DisableCHAOptimizedCode();
 
   RawArray* cha_codes() const { return raw_ptr()->cha_codes_; }
   void set_cha_codes(const Array& value) const;
 
+  bool trace_allocation() const {
+    return TraceAllocationBit::decode(raw_ptr()->state_bits_);
+  }
+  void SetTraceAllocation(bool trace_allocation) const;
+
  private:
   enum MemberKind {
     kAny = 0,
     kStatic,
     kInstance,
     kConstructor,
     kFactory,
   };
   enum StateBits {
     kConstBit = 0,
     kImplementedBit = 1,
     kTypeFinalizedBit = 2,
     kClassFinalizedPos = 3,
     kClassFinalizedSize = 2,
     kAbstractBit = kClassFinalizedPos + kClassFinalizedSize,  // = 5
     kPatchBit = 6,
     kSynthesizedClassBit = 7,
     kMarkedForParsingBit = 8,
     kMixinAppAliasBit = 9,
     kMixinTypeAppliedBit = 10,
     kFieldsMarkedNullableBit = 11,
     kCycleFreeBit = 12,
     kEnumBit = 13,
+    kTraceAllocationBit = 14,
   };
   class ConstBit : public BitField<bool, kConstBit, 1> {};
   class ImplementedBit : public BitField<bool, kImplementedBit, 1> {};
   class TypeFinalizedBit : public BitField<bool, kTypeFinalizedBit, 1> {};
   class ClassFinalizedBits : public BitField<RawClass::ClassFinalizedState,
       kClassFinalizedPos, kClassFinalizedSize> {};  // NOLINT
   class AbstractBit : public BitField<bool, kAbstractBit, 1> {};
   class PatchBit : public BitField<bool, kPatchBit, 1> {};
   class SynthesizedClassBit : public BitField<bool, kSynthesizedClassBit, 1> {};
   class MarkedForParsingBit : public BitField<bool, kMarkedForParsingBit, 1> {};
   class MixinAppAliasBit : public BitField<bool, kMixinAppAliasBit, 1> {};
   class MixinTypeAppliedBit : public BitField<bool, kMixinTypeAppliedBit, 1> {};
   class FieldsMarkedNullableBit : public BitField<bool,
       kFieldsMarkedNullableBit, 1> {};  // NOLINT
   class CycleFreeBit : public BitField<bool, kCycleFreeBit, 1> {};
   class EnumBit : public BitField<bool, kEnumBit, 1> {};
+  class TraceAllocationBit : public BitField<bool, kTraceAllocationBit, 1> {};
 
   void set_name(const String& value) const;
   void set_pretty_name(const String& value) const;
   void set_user_name(const String& value) const;
   RawString* GeneratePrettyName() const;
   RawString* GenerateUserVisibleName() const;
   void set_signature_function(const Function& value) const;
   void set_signature_type(const AbstractType& value) const;
   void set_state_bits(intptr_t bits) const;
 
@@ skipping 6561 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_