Revert "Switch profiler from isolates to threads"

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/bitfield.h"
 #include "vm/code_observers.h"
@@ skipping 15 matching lines @@
 class SampleBuffer;
 
 class Profiler : public AllStatic {
  public:
   static void InitOnce();
   static void Shutdown();
 
   static void SetSampleDepth(intptr_t depth);
   static void SetSamplePeriod(intptr_t period);
 
+  static void InitProfilingForIsolate(Isolate* isolate,
+                                      bool shared_buffer = true);
+  static void ShutdownProfilingForIsolate(Isolate* isolate);
+
+  static void BeginExecution(Isolate* isolate);
+  static void EndExecution(Isolate* isolate);
+
   static SampleBuffer* sample_buffer() {
     return sample_buffer_;
   }
 
-  static void SampleAllocation(Thread* thread, intptr_t cid);
-  static void SampleThread(Thread* thread,
-                           const InterruptedThreadState& state);
+  static void RecordAllocation(Thread* thread, intptr_t cid);
 
  private:
   static bool initialized_;
   static Monitor* monitor_;
 
+  static void RecordSampleInterruptCallback(const InterruptedThreadState& state,
+                                            void* data);
+
   static SampleBuffer* sample_buffer_;
-
-  friend class Thread;
 };
 
 
+class IsolateProfilerData {
+ public:
+  IsolateProfilerData(SampleBuffer* sample_buffer, bool own_sample_buffer);
+  ~IsolateProfilerData();
+
+  SampleBuffer* sample_buffer() const { return sample_buffer_; }
+
+  void set_sample_buffer(SampleBuffer* sample_buffer) {
+    sample_buffer_ = sample_buffer;
+  }
+
+  bool blocked() const {
+    return block_count_ > 0;
+  }
+
+  void Block();
+
+  void Unblock();
+
+ private:
+  SampleBuffer* sample_buffer_;
+  bool own_sample_buffer_;
+  intptr_t block_count_;
+
+  DISALLOW_COPY_AND_ASSIGN(IsolateProfilerData);
+};
+
+
 class SampleVisitor : public ValueObject {
  public:
   explicit SampleVisitor(Isolate* isolate) : isolate_(isolate), visited_(0) { }
   virtual ~SampleVisitor() {}
 
   virtual void VisitSample(Sample* sample) = 0;
 
   intptr_t visited() const {
     return visited_;
   }
@@ skipping 458 matching lines @@
 
  private:
   ZoneGrowableArray<ProcessedSample*> samples_;
 
   DISALLOW_COPY_AND_ASSIGN(ProcessedSampleBuffer);
 };
 
 }  // namespace dart
 
 #endif  // VM_PROFILER_H_