Support dec_b instruction in ia32 and x64 disassembler.

src/ia32/disasm-ia32.cc

 // Copyright 2007-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1176 matching lines @@
           }
         } else {
           UnimplementedInstruction();
         }
         break;
 
       case 0xFE:
         { data++;
           int mod, regop, rm;
           get_modrm(*data, &mod, &regop, &rm);
-          if (mod == 3 && regop == ecx) {
-            AppendToBuffer("dec_b %s", NameOfCPURegister(rm));
+          if (regop == ecx) {
+            AppendToBuffer("dec_b ");
+            data += PrintRightOperand(data);

[antonm, 2010/09/23 19:23:09]

shouldn't that be PrintRightByteOperand?

[Vladislav Kaznacheev, 2010/09/23 19:29:24]

PrintRightByteOperand would print something like dec_b [cl] while we want dec_b
[ecx]
On 2010/09/23 19:23:09, antonm wrote:

           } else {
             UnimplementedInstruction();
           }
-          data++;
         }
         break;
 
       case 0x68:
         AppendToBuffer("push 0x%x", *reinterpret_cast<int32_t*>(data+1));
         data += 5;
         break;
 
       case 0x6A:
         AppendToBuffer("push 0x%x", *reinterpret_cast<int8_t*>(data + 1));
@@ skipping 293 matching lines @@
       fprintf(f, "  ");
     }
     fprintf(f, "  %s\n", buffer.start());
   }
 }
 
 
 }  // namespace disasm
 
 #endif  // V8_TARGET_ARCH_IA32