Implement a heap profiler for the Dart managed heap.

runtime/vm/raw_object.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_RAW_OBJECT_H_
 #define VM_RAW_OBJECT_H_
 
 #include "platform/assert.h"
 #include "vm/globals.h"
 #include "vm/token.h"
@@ skipping 129 matching lines @@
 
 #define SNAPSHOT_WRITER_SUPPORT()                                              \
   void WriteTo(                                                                \
       SnapshotWriter* writer, intptr_t object_id, Snapshot::Kind kind);        \
   friend class SnapshotWriter;                                                 \
 
 #define VISITOR_SUPPORT(object)                                                \
   static intptr_t Visit##object##Pointers(Raw##object* raw_obj,                \
                                           ObjectPointerVisitor* visitor);
 
+#define HEAP_PROFILER_SUPPORT()                                                \
+  friend class HeapProfiler;                                                   \
+
 #define RAW_OBJECT_IMPLEMENTATION(object)                                      \
  private:  /* NOLINT */                                                        \
   VISITOR_SUPPORT(object)                                                      \
   friend class object;                                                         \
   friend class RawObject;                                                      \
   friend class Heap;                                                           \
   DISALLOW_ALLOCATION();                                                       \
   DISALLOW_IMPLICIT_CONSTRUCTORS(Raw##object)
 
 #define RAW_HEAP_OBJECT_IMPLEMENTATION(object)                                 \
   private:                                                                     \
     RAW_OBJECT_IMPLEMENTATION(object);                                         \
     Raw##object* ptr() const {                                                 \
       ASSERT(IsHeapObject());                                                  \
       return reinterpret_cast<Raw##object*>(                                   \
           reinterpret_cast<uword>(this) - kHeapObjectTag);                     \
     }                                                                          \
     SNAPSHOT_WRITER_SUPPORT()                                                  \
+    HEAP_PROFILER_SUPPORT()                                                    \
 
 
 // RawObject is the base class of all raw objects, even though it carries the
 // class_ field not all raw objects are allocated in the heap and thus cannot
 // be dereferenced (e.g. RawSmi).
 class RawObject {
  public:
   // The tags field which is a part of the object header uses the following
   // bit fields for storing tags.
   enum TagBits {
@@ skipping 154 matching lines @@
         reinterpret_cast<uword>(this) - kHeapObjectTag);
   }
 
   intptr_t SizeFromClass() const;
 
   intptr_t GetClassId() const {
     uword tags = ptr()->tags_;
     return ClassIdTag::decode(tags);
   }
 
+  ObjectKind GetObjectKind() const;
+
   friend class Api;
   friend class Array;
   friend class FreeListElement;
   friend class Heap;
+  friend class HeapProfiler;
+  friend class HeapProfilerRootVisitor;
   friend class MarkingVisitor;
   friend class Object;
   friend class RawInstructions;
   friend class RawInstance;
   friend class SnapshotReader;
   friend class SnapshotWriter;
 
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(RawObject);
 };
@@ skipping 25 matching lines @@
   RawFunction* signature_function_;  // Associated function for signature class.
   RawArray* functions_cache_;  // See class FunctionsCache.
   RawArray* constants_;  // Canonicalized values of this class.
   RawArray* canonical_types_;  // Canonicalized types of this class.
   RawCode* allocation_stub_;  // Stub code for allocation of instances.
   RawObject** to() {
     return reinterpret_cast<RawObject**>(&ptr()->allocation_stub_);
   }
 
   cpp_vtable handle_vtable_;
-  intptr_t instance_size_;
+  intptr_t instance_size_;  // Size if fixed length or 0 if variable length.
   ObjectKind instance_kind_;
   intptr_t id_;  // Class Id, also index in the class table.
   intptr_t type_arguments_instance_field_offset_;  // May be kNoTypeArguments.
-  intptr_t next_field_offset_;  // Offset of then next instance field.
+  intptr_t next_field_offset_;  // Offset of the next instance field.
   intptr_t num_native_fields_;  // Number of native fields in class.
   intptr_t token_index_;
   int8_t class_state_;  // Of type ClassState.
   bool is_const_;
   bool is_interface_;
 
   friend class Object;
   friend class RawInstance;
   friend class RawInstructions;
   friend class SnapshotReader;
@@ skipping 1092 matching lines @@
          kExternalUint64Array == kByteArray + 18 &&
          kExternalFloat32Array == kByteArray + 19 &&
          kExternalFloat64Array == kByteArray + 20 &&
          kClosure == kByteArray + 21);
   return (index >= kByteArray && index <= kClosure);
 }
 
 }  // namespace dart
 
 #endif  // VM_RAW_OBJECT_H_