Support stacktrace and objecthistogram service commands

runtime/vm/disassembler.h

Index: runtime/vm/disassembler.h
diff --git a/runtime/vm/disassembler.h b/runtime/vm/disassembler.h
index 1f2a22c7fc07e14b2f0db4149c9ffa4afc38cd80..893f0e815dbc28eac6f30fff84fba5c78b5dcdda 100644
--- a/runtime/vm/disassembler.h
+++ b/runtime/vm/disassembler.h
@@ -13,6 +13,7 @@ namespace dart {
 
 // Froward declaration.
 class MemoryRegion;
+class JSONStream;
 
 // Disassembly formatter interface, which consumes the
 // disassembled instructions in any desired form.
@@ -54,6 +55,28 @@ class DisassembleToStdout : public DisassemblyFormatter {
 };
 
 
+// Disassemble into a JSONStream.
+class DisassembleToJSONStream : public DisassemblyFormatter {
+ public:
+  explicit DisassembleToJSONStream(JSONStream* stream) : DisassemblyFormatter(),
+      stream_(stream) { }
+  ~DisassembleToJSONStream() { }
+
+  virtual void ConsumeInstruction(char* hex_buffer,
+                                  intptr_t hex_size,
+                                  char* human_buffer,
+                                  intptr_t human_size,
+                                  uword pc);
+
+  virtual void Print(const char* format, ...) PRINTF_ATTRIBUTE(2, 3);
+
+ private:
+  JSONStream* stream_;
+  DISALLOW_ALLOCATION();
+  DISALLOW_COPY_AND_ASSIGN(DisassembleToJSONStream);
+};
+
+
 // Disassemble instructions.
 class Disassembler : public AllStatic {
  public: