Endless thread safe timeline recorder

runtime/vm/thread.h

 // Copyright (c) 2015, 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_THREAD_H_
 #define VM_THREAD_H_
 
 #include "vm/globals.h"
 #include "vm/os_thread.h"
 #include "vm/store_buffer.h"
 
 namespace dart {
 
 class CHA;
 class HandleScope;
 class Heap;
 class Isolate;
 class Object;
 class RawBool;
 class RawObject;
 class StackResource;
+class TimelineEventBlock;
 class Zone;
 
 
 // List of VM-global objects/addresses cached in each Thread object.
 #define CACHED_VM_OBJECTS_LIST(V)                                              \
   V(RawObject*, object_null_, Object::null(), NULL)                            \
   V(RawBool*, bool_true_, Object::bool_true().raw(), NULL)                     \
   V(RawBool*, bool_false_, Object::bool_false().raw(), NULL)                   \
 
 #define CACHED_ADDRESSES_LIST(V)                                               \
@@ skipping 148 matching lines @@
     state_.no_safepoint_scope_depth -= 1;
 #endif
   }
 
   // Collection of isolate-specific state of a thread that is saved/restored
   // on isolate exit/re-entry.
   struct State {
     Zone* zone;
     uword top_exit_frame_info;
     StackResource* top_resource;
+    TimelineEventBlock* current_block;

[koda, 2015/08/07 01:09:54]

Name is a bit too general; consider adding "_timeline" or "_event" to avoid
confusion with store_buffer_block. Ditto below.

[Cutch, 2015/08/07 16:47:42]

Done.

 #if defined(DEBUG)
     HandleScope* top_handle_scope;
     intptr_t no_handle_scope_depth;
     int32_t no_safepoint_scope_depth;
 #endif
   };
 
 #define DEFINE_OFFSET_METHOD(type_name, member_name, expr, default_init_value) \
   static intptr_t member_name##offset() {                                      \
     return OFFSET_OF(Thread, member_name);                                     \
   }
 CACHED_CONSTANTS_LIST(DEFINE_OFFSET_METHOD)
 #undef DEFINE_OFFSET_METHOD
 
   static bool CanLoadFromThread(const Object& object);
   static intptr_t OffsetFromThread(const Object& object);
 
+  TimelineEventBlock* current_block() const {
+    return state_.current_block;
+  }
+
+  void set_current_block(TimelineEventBlock* block) {
+    state_.current_block = block;
+  }
+
  private:
   static ThreadLocalKey thread_key_;
 
   Isolate* isolate_;
   Heap* heap_;
   State state_;
   StoreBufferBlock* store_buffer_block_;
 #define DECLARE_MEMBERS(type_name, member_name, expr, default_init_value)      \
   type_name member_name;
 CACHED_CONSTANTS_LIST(DECLARE_MEMBERS)
@@ skipping 11 matching lines @@
     state_.zone = zone;
   }
 
   void set_top_exit_frame_info(uword top_exit_frame_info) {
     state_.top_exit_frame_info = top_exit_frame_info;
   }
 
   static void SetCurrent(Thread* current);
 
   void Schedule(Isolate* isolate);
+  void PostSchedule();
   void Unschedule();
 
   friend class ApiZone;
   friend class Isolate;
   friend class StackZone;
   DISALLOW_COPY_AND_ASSIGN(Thread);
 };
 
 }  // namespace dart
 
 #endif  // VM_THREAD_H_