Track live instance and allocation counts for classes

runtime/vm/assembler_arm.h

 // Copyright (c) 2013, 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_ASSEMBLER_ARM_H_
 #define VM_ASSEMBLER_ARM_H_
 
 #ifndef VM_ASSEMBLER_H_
 #error Do not include assembler_arm.h directly; use assembler.h instead.
 #endif
@@ skipping 711 matching lines @@
   // Set up a stub frame so that the stack traversal code can easily identify
   // a stub frame.
   void EnterStubFrame(bool load_pp = false);
   void LeaveStubFrame();
 
   // Instruction pattern from entrypoint is used in Dart frame prologs
   // to set up the frame and save a PC which can be used to figure out the
   // RawInstruction object corresponding to the code running in the frame.
   static const intptr_t kEntryPointToPcMarkerOffset = Instr::kPCReadOffset;
 
+  void BumpAllocationCount(Heap::Space space,
+                           intptr_t cid,
+                           Register temp_reg);
+
+  void BumpAllocationCount(Heap::Space space,
+                           intptr_t cid,
+                           Register size_reg,
+                           Register temp_reg);

[srdjan, 2013/12/12 15:52:32]

I find method overloading leads easily to typos, and makes the code harder to
read as it is not cleat which method is being called ... so I would prefer
different names instead.
Also you may consider using similar interface as for allocation: pass 'space' as
last argument and use kNew as default. 

[Cutch, 2013/12/13 01:31:09]

Done.

+
   // Inlined allocation of an instance of class 'cls', code has no runtime
   // calls. Jump to 'failure' if the instance cannot be allocated here.
   // Allocated instance is returned in 'instance_reg'.
   // Only the tags field of the object is initialized.
   void TryAllocate(const Class& cls,
                    Label* failure,
-                   Register instance_reg);
+                   Register instance_reg,
+                   Register temp_reg);
 
   // Emit data (e.g encoded instruction or immediate) in instruction stream.
   void Emit(int32_t value);
 
   // On some other platforms, we draw a distinction between safe and unsafe
   // smis.
   static bool IsSafe(const Object& object) { return true; }
   static bool IsSafeSmi(const Object& object) { return object.IsSmi(); }
 
  private:
@@ skipping 131 matching lines @@
                                   Register value,
                                   Label* no_update);
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(Assembler);
 };
 
 }  // namespace dart
 
 #endif  // VM_ASSEMBLER_ARM_H_