Use the Code's pointer offsets to find object references when disassembling IA32.

runtime/vm/disassembler.h

 // Copyright (c) 2011, 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_DISASSEMBLER_H_
 #define VM_DISASSEMBLER_H_
 
 #include "vm/allocation.h"
 #include "vm/assembler.h"
 #include "vm/globals.h"
@@ skipping 11 matching lines @@
  public:
   DisassemblyFormatter() { }
   virtual ~DisassemblyFormatter() { }
 
   // Consume the decoded instruction at the given pc.
   virtual void ConsumeInstruction(const Code& code,
                                   char* hex_buffer,
                                   intptr_t hex_size,
                                   char* human_buffer,
                                   intptr_t human_size,
+                                  Object* object,
                                   uword pc) = 0;
 
   // Print a formatted message.
   virtual void Print(const char* format, ...) = 0;
 };
 
 
 // Basic disassembly formatter that outputs the disassembled instruction
 // to stdout.
 class DisassembleToStdout : public DisassemblyFormatter {
  public:
   DisassembleToStdout() : DisassemblyFormatter() { }
   ~DisassembleToStdout() { }
 
   virtual void ConsumeInstruction(const Code& code,
                                   char* hex_buffer,
                                   intptr_t hex_size,
                                   char* human_buffer,
                                   intptr_t human_size,
+                                  Object* object,
                                   uword pc);
 
   virtual void Print(const char* format, ...) PRINTF_ATTRIBUTE(2, 3);
 
  private:
   DISALLOW_ALLOCATION()
   DISALLOW_COPY_AND_ASSIGN(DisassembleToStdout);
 };
 
 
 // Disassemble into a JSONStream.
 class DisassembleToJSONStream : public DisassemblyFormatter {
  public:
   explicit DisassembleToJSONStream(const JSONArray& jsarr)
       : DisassemblyFormatter(), jsarr_(jsarr) { }
   ~DisassembleToJSONStream() { }
 
   virtual void ConsumeInstruction(const Code& code,
                                   char* hex_buffer,
                                   intptr_t hex_size,
                                   char* human_buffer,
                                   intptr_t human_size,
+                                  Object* object,
                                   uword pc);
 
   virtual void Print(const char* format, ...) PRINTF_ATTRIBUTE(2, 3);
 
  private:
   const JSONArray& jsarr_;
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(DisassembleToJSONStream);
 };
 
@@ skipping 22 matching lines @@
     LogBlock lb;
     Disassemble(start, end, &stdout_formatter, code);
   }
 
   static void Disassemble(uword start, uword end) {
     DisassembleToStdout stdout_formatter;
     LogBlock lb;
     Disassemble(start, end, &stdout_formatter);
   }
 
-  // Disassemble instructions in a memory region.
-  static void DisassembleMemoryRegion(const MemoryRegion& instructions,
-                                      DisassemblyFormatter* formatter) {
-    uword start = instructions.start();
-    uword end = instructions.end();
-    Disassemble(start, end, formatter);
-  }
-
-  static void DisassembleMemoryRegion(const MemoryRegion& instructions) {
-    uword start = instructions.start();
-    uword end = instructions.end();
-    Disassemble(start, end);
-  }
-
   // Decodes one instruction.
   // Writes a hexadecimal representation into the hex_buffer and a
   // human-readable representation into the human_buffer.
   // Writes the length of the decoded instruction in bytes in out_instr_len.
   static void DecodeInstruction(char* hex_buffer, intptr_t hex_size,
                                 char* human_buffer, intptr_t human_size,
-                                int* out_instr_len, uword pc);
-
-  static bool CanFindOldObject(uword addr);
+                                int* out_instr_len, const Code& code,
+                                Object** object, uword pc);
 
   static void DisassembleCode(const Function& function, bool optimized);
   static void DisassembleCodeUnoptimized(
       const Function& function, bool optimized);
 
  private:
   static void DisassembleCodeHelper(
       const char* function_fullname, const Code& code, bool optimized);
 
   static const int kHexadecimalBufferSize = 32;
   static const int kUserReadableBufferSize = 256;
 };
 
 }  // namespace dart
 
 #endif  // VM_DISASSEMBLER_H_