Changes to run "Hello, world!" on MIPS hardware.

runtime/vm/assembler_mips.cc

 // Copyright (c) 2013, 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/globals.h"
 #if defined(TARGET_ARCH_MIPS)
 
 #include "vm/assembler.h"
 #include "vm/runtime_entry.h"
 #include "vm/simulator.h"
 #include "vm/stub_code.h"
 
 namespace dart {
 
+#if defined(USING_SIMULATOR)
 DECLARE_FLAG(bool, trace_sim);
+#endif
 DEFINE_FLAG(bool, print_stop_message, false, "Print stop message.");
 
 
 void Assembler::InitializeMemoryWithBreakpoints(uword data, int length) {
   ASSERT(Utils::IsAligned(data, 4));
   ASSERT(Utils::IsAligned(length, 4));
   const uword end = data + length;
   while (data < end) {
     *reinterpret_cast<int32_t*>(data) = Instr::kBreakPointInstruction;
     data += 4;
@@ skipping 427 matching lines @@
 
   // Adjust SP for PC pushed in EnterDartFrame, and return.
   Ret();
   delay_slot()->addiu(SP, SP, Immediate(4 * kWordSize));
 }
 
 
 void Assembler::ReserveAlignedFrameSpace(intptr_t frame_space) {
   // Reserve space for arguments and align frame before entering
   // the C++ world.
-  AddImmediate(SP, -frame_space);
+  if (frame_space != 0) {
+    AddImmediate(SP, -frame_space);

[regis, 2013/05/31 16:44:13]

On ARM, AddImmediate of 0 to the same register will be ignored.
It is also ignored on ia32 and x64. You should rather fix AddImmediate.

[zra, 2013/05/31 18:41:17]

Done.

+  }
   if (OS::ActivationFrameAlignment() > 0) {
     LoadImmediate(TMP1, ~(OS::ActivationFrameAlignment() - 1));
     and_(SP, SP, TMP1);
   }
 }
 
 
 void Assembler::EnterCallRuntimeFrame(intptr_t frame_space) {
   const intptr_t kPushedRegistersSize =
       kDartVolatileCpuRegCount * kWordSize +
@@ skipping 94 matching lines @@
   }
   Label stop;
   b(&stop);
   Emit(reinterpret_cast<int32_t>(message));
   Bind(&stop);
   break_(Instr::kStopMessageCode);
 }
 
 
 void Assembler::TraceSimMsg(const char* message) {
-  //  Don't bother adding in the messages unless tracing is enabled.
+  // Don't bother adding in the messages unless tracing is enabled, and we are
+  // running in the simulator.
+#if defined(USING_SIMULATOR)
   if (FLAG_trace_sim) {
     Label msg;
     b(&msg);
     Emit(reinterpret_cast<int32_t>(message));
     Bind(&msg);
     break_(Instr::kMsgMessageCode);
   }
+#endif
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS