Emit fake classes to please the third party HPROF tool infrastructure.

runtime/vm/heap_profiler.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_HEAP_PROFILER_H_
 #define VM_HEAP_PROFILER_H_
 
 #include <set>
 
 #include "include/dart_api.h"
@@ skipping 56 matching lines @@
     kBoolean = 4,
     kChar = 5,
     kFloat = 6,
     kDouble = 7,
     kByte = 8,
     kShort = 9,
     kInt = 10,
     kLong = 11
   };
 
+  // Object ids for fake classes.
+  //
+  // While not necessary to describe Dart programs, third party tools
+  // expect these types.  These tools also interpret id values as raw
+  // addresses so we space them by 8 to not look like compressed oops.
+  enum FakeClass {
+    kJavaLangClass = 1,
+    kJavaLangClassLoader = 9,
+    kJavaLangObject = 17,
+    kJavaLangString = 25,
+    kArrayObject = 33,
+    kArrayBoolean = 41,
+    kArrayChar = 49,
+    kArrayFloat = 57,
+    kArrayDouble = 65,
+    kArrayByte = 73,
+    kArrayShort = 81,
+    kArrayInt = 89,
+    kArrayLong = 97
+  };
+
   static const int kObjectIdSize = sizeof(uint64_t);  // NOLINT
 
   HeapProfiler(Dart_FileWriteCallback callback, void* stream);
   ~HeapProfiler();
 
   // Writes a root to the heap dump.
   void WriteRoot(const RawObject* raw_obj);
 
   // Writes a object to the heap dump.
   void WriteObject(const RawObject* raw_obj);
@@ skipping 125 matching lines @@
 
   // Invokes the write callback.
   void Write(const void* data, intptr_t size);
 
   // Writes the binary hprof header to the output stream.
   void WriteHeader();
 
   // Writes a record to the output stream.
   void WriteRecord(const Record& record);
 
-
   // Writes a string in utf-8 record to the output stream.
   void WriteStringInUtf8(const char* c_string);
   void WriteStringInUtf8(const RawString* raw_string);
 
-
   // Writes a load class record to the output stream.
   void WriteLoadClass(const RawClass* raw_class);
+  void WriteFakeLoadClass(FakeClass fake_class, const char* class_name);
 
   // Writes an empty stack trace to the output stream.
   void WriteStackTrace();
 
   // Writes a heap summary record to the output stream.
   void WriteHeapSummary(uint32_t total_live_bytes,
                         uint32_t total_live_instances,
                         uint64_t total_bytes_allocated,
                         uint64_t total_instances_allocated);
 
   // Writes a heap dump record to the output stream.
   void WriteHeapDump();
 
   // Writes a sub-record to the heap dump record.
   void WriteClassDump(const RawClass* raw_class);
+  void WriteFakeClassDump(FakeClass fake_class, FakeClass fake_super_class);
   void WriteInstanceDump(const RawObject* raw_obj);
   void WriteObjectArrayDump(const RawArray* raw_array);
   void WritePrimitiveArrayDump(const RawByteArray* raw_byte_array,
                                uint8_t tag,
                                const void* data);
 
   static const RawClass* GetClass(const RawObject* raw_obj);
   static const RawClass* GetSuperClass(const RawClass* raw_class);
 
   Dart_FileWriteCallback write_callback_;
@@ skipping 51 matching lines @@
   virtual void VisitObject(RawObject* obj);
 
  private:
   HeapProfiler* profiler_;
   DISALLOW_COPY_AND_ASSIGN(HeapProfilerObjectVisitor);
 };
 
 }  // namespace dart
 
 #endif  // VM_HEAP_PROFILER_H_