Copies Simulator Debugger from ARM to MIPS.

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 1746 matching lines @@
   for (int i = 0; (i < instruction_length) && (remaining_size > 2); ++i) {
     OS::SNPrint(&hex_buffer[hex_index], remaining_size, "%02x", pc_ptr[i]);
     hex_index += 2;
     remaining_size -= 2;
   }
   hex_buffer[hex_index] = '\0';
   return instruction_length;
 }
 
 
-void Disassembler::Disassemble(uword start,
+bool Disassembler::Disassemble(uword start,
                                uword end,
                                DisassemblyFormatter* formatter,
                                const Code::Comments& 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",
           String::Handle(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;
   }
+  // X86Decoder aborts on unknown instruction.
+  return true;
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32