A64: In the Simulator, corrupt caller-saved registers after runtime printf call.

src/a64/simulator-a64.cc

 // Copyright 2013 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 3613 matching lines @@
                            xreg(5), xreg(6), xreg(7));
         } else if (type == CPURegister::kFPRegister) {
           result = fprintf(stream_, format,
                            dreg(0), dreg(1), dreg(2), dreg(3),
                            dreg(4), dreg(5), dreg(6), dreg(7));
         } else {
           ASSERT(type == CPURegister::kNoRegister);
           result = fprintf(stream_, "%s", format);
         }
         fputs(clr_normal, stream_);
+
+#ifdef DEBUG
+        CorruptAllCallerSavedCPURegisters();
+#endif
+
         set_xreg(0, result);
 
-        // TODO(jbramley): Consider clobbering all caller-saved registers here.
-
         // The printf parameters are inlined in the code, so skip them.
         set_pc(pc_->InstructionAtOffset(kPrintfLength));
 
         // Set LR as if we'd just called a native printf function.
         set_lr(pc());
 
       } else if (instr->ImmException() == kImmExceptionIsUnreachable) {
         fprintf(stream_, "Hit UNREACHABLE marker at PC=%p.\n",
                 reinterpret_cast<void*>(pc_));
         abort();
 
       } else {
         OS::DebugBreak();
       }
       break;
     }
 
     default:
       UNIMPLEMENTED();
   }
 }
 
 #endif  // USE_SIMULATOR
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_A64