Add code comment to ia32 disassembly as well, bug fix new ia32 compiler, remove use of TMP register…

runtime/vm/disassembler_ia32.cc

 // 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.
 
 #include "vm/disassembler.h"
 
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_IA32.
 #if defined(TARGET_ARCH_IA32)
 #include "platform/utils.h"
 #include "vm/allocation.h"
@@ skipping 1564 matching lines @@
   }
   hex_buffer[hex_index] = '\0';
   return instruction_length;
 }
 
 
 void Disassembler::Disassemble(uword start,
                                uword end,
                                DisassemblyFormatter* formatter,
                                const Code::Comments& comments) {
-  // TODO(vegorov): Decode and display comments.
   ASSERT(formatter != NULL);
   char hex_buffer[kHexadecimalBufferSize];  // Instruction in hexadecimal form.
   char human_buffer[kUserReadableBufferSize];  // Human-readable instruction.
   uword pc = start;
+  intptr_t comment_finger = 0;
   while (pc < end) {
+    const intptr_t offset = pc - start;
+    while (comment_finger < comments.Length() &&
+           comments.PCOffsetAt(comment_finger) <= offset) {
+      formatter->Print("        ;; %s\n",
+                       comments.CommentAt(comment_finger).ToCString());
+      comment_finger++;
+    }
     int instruction_length = DecodeInstruction(hex_buffer,
                                                sizeof(hex_buffer),
                                                human_buffer,
                                                sizeof(human_buffer),
                                                pc);
     formatter->ConsumeInstruction(hex_buffer,
                                   sizeof(hex_buffer),
                                   human_buffer,
                                   sizeof(human_buffer),
                                   pc);
     pc += instruction_length;
   }
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32