Profiler tweaks

runtime/vm/profiler.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_PROFILER_H_
 #define VM_PROFILER_H_
 
 #include "vm/allocation.h"
 #include "vm/code_observers.h"
 #include "vm/globals.h"
@@ skipping 223 matching lines @@
   }
 
   bool ignore_sample() const {
     return IgnoreBit::decode(state_);
   }
 
   void set_ignore_sample(bool ignore_sample) {
     state_ = IgnoreBit::update(ignore_sample, state_);
   }
 
+  bool exit_frame_sample() const {
+    return ExitFrameBit::decode(state_);
+  }
+
+  void set_exit_frame_sample(bool exit_frame_sample) {
+    state_ = ExitFrameBit::update(exit_frame_sample, state_);
+  }
+
   static void InitOnce();
 
   static intptr_t instance_size() {
     return instance_size_;
   }
 
   uword* GetPCArray() const;
 
  private:
   static intptr_t instance_size_;
   static intptr_t pcs_length_;
   enum StateBits {
     kProcessedBit = 0,
     kLeafFrameIsDartBit = 1,
     kIgnoreBit = 2,
+    kExitFrameBit = 3,
   };
   class ProcessedBit : public BitField<bool, kProcessedBit, 1> {};
   class LeafFrameIsDart : public BitField<bool, kLeafFrameIsDartBit, 1> {};
   class IgnoreBit : public BitField<bool, kIgnoreBit, 1> {};
+  class ExitFrameBit : public BitField<bool, kExitFrameBit, 1> {};
 
   int64_t timestamp_;
   ThreadId tid_;
   Isolate* isolate_;
   uword pc_marker_;
   uword vm_tag_;
   uword user_tag_;
   uword sp_;
   uword fp_;
   uword state_;
@@ skipping 24 matching lines @@
   intptr_t capacity() const { return capacity_; }
 
   Sample* At(intptr_t idx) const;
   Sample* ReserveSample();
 
   void VisitSamples(SampleVisitor* visitor) {
     ASSERT(visitor != NULL);
     const intptr_t length = capacity();
     for (intptr_t i = 0; i < length; i++) {
       Sample* sample = At(i);
+      if (sample->ignore_sample()) {
+        // Bad sample.
+        continue;
+      }
       if (sample->isolate() != visitor->isolate()) {
         // Another isolate.
         continue;
       }
       if (sample->timestamp() == 0) {
         // Empty.
         continue;
       }
       if (sample->At(0) == 0) {
         // No frames.
         continue;
       }
       visitor->IncrementVisited();
       visitor->VisitSample(sample);
     }
   }
 
  private:
   Sample* samples_;
   intptr_t capacity_;
   uintptr_t cursor_;
 
   DISALLOW_COPY_AND_ASSIGN(SampleBuffer);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_PROFILER_H_