Update Assembler::TryAllocate to support inline allocation tracing

runtime/vm/class_table.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_CLASS_TABLE_H_
 #define VM_CLASS_TABLE_H_
 
 #include "platform/assert.h"
+#include "vm/bitfield.h"
 #include "vm/globals.h"
 
 namespace dart {
 
 class Class;
 class ClassStats;
 class JSONArray;
 class JSONObject;
 class JSONStream;
 template<typename T> class MallocGrowableArray;
@@ skipping 76 matching lines @@
            OFFSET_OF(AllocStats<intptr_t>, old_count);
   }
   static intptr_t allocated_size_since_gc_new_space_offset() {
     return OFFSET_OF(ClassHeapStats, recent) +
            OFFSET_OF(AllocStats<intptr_t>, new_size);
   }
   static intptr_t allocated_size_since_gc_old_space_offset() {
     return OFFSET_OF(ClassHeapStats, recent) +
            OFFSET_OF(AllocStats<intptr_t>, old_size);
   }
+  static intptr_t state_offset() {
+    return OFFSET_OF(ClassHeapStats, state_);
+  }
+  static intptr_t TraceAllocationMask() {
+    return (1 << kTraceAllocationBit);
+  }
 
   void Initialize();
   void ResetAtNewGC();
   void ResetAtOldGC();
   void ResetAccumulator();
   void UpdatePromotedAfterNewGC();
   void UpdateSize(intptr_t instance_size);
   void PrintToJSONObject(const Class& cls, JSONObject* obj) const;
   void Verify();
 
+  bool trace_allocation() const {
+    return TraceAllocationBit::decode(state_);
+  }
+
+  void set_trace_allocation(bool trace_allocation) {
+    state_ = TraceAllocationBit::update(trace_allocation, state_);
+  }
+
  private:
+  enum StateBits {
+    kTraceAllocationBit = 0,
+  };
+
+  class TraceAllocationBit : public BitField<bool, kTraceAllocationBit, 1> {};
+
   // Recent old at start of last new GC (used to compute promoted_*).
   intptr_t old_pre_new_gc_count_;
   intptr_t old_pre_new_gc_size_;
+  intptr_t state_;
 };
 
 
 class ClassTable {
  public:
   ClassTable();
   // Creates a shallow copy of the original class table for some read-only
   // access, without support for stats data.
   explicit ClassTable(ClassTable* original);
   ~ClassTable();
@@ skipping 58 matching lines @@
   }
 
   ClassHeapStats* StatsWithUpdatedSize(intptr_t cid);
 
   void AllocationProfilePrintJSON(JSONStream* stream);
   void ResetAllocationAccumulators();
 
   // Deallocates table copies. Do not call during concurrent access to table.
   void FreeOldTables();
 
+  void TraceAllocationsFor(intptr_t cid, bool trace);
+
  private:
   friend class MarkingVisitor;
   friend class ScavengerVisitor;
   friend class ClassHeapStatsTestHelper;
   static const int initial_capacity_ = 512;
   static const int capacity_increment_ = 256;
 
   static bool ShouldUpdateSizeForClassId(intptr_t cid);
 
   intptr_t top_;
@@ skipping 11 matching lines @@
   ClassHeapStats* PreliminaryStatsAt(intptr_t cid);
   void UpdateLiveOld(intptr_t cid, intptr_t size);
   void UpdateLiveNew(intptr_t cid, intptr_t size);
 
   DISALLOW_COPY_AND_ASSIGN(ClassTable);
 };
 
 }  // namespace dart
 
 #endif  // VM_CLASS_TABLE_H_