Supports FrameLookup vm test on MIPS

runtime/vm/simulator_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 <math.h>  // for isnan.
 #include <setjmp.h>
 #include <stdlib.h>
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_MIPS)
@@ skipping 814 matching lines @@
 
 void Simulator::DoBreak(Instr *instr) {
   ASSERT(instr->OpcodeField() == SPECIAL);
   ASSERT(instr->FunctionField() == BREAK);
   if (instr->BreakCodeField() == Instr::kStopMessageCode) {
     SimulatorDebugger dbg(this);
     const char* message = *reinterpret_cast<const char**>(
         reinterpret_cast<intptr_t>(instr) - Instr::kInstrSize);
     set_pc(get_pc() + Instr::kInstrSize);
     dbg.Stop(instr, message);
+    // Adjust for extra pc increment.
+    set_pc(get_pc() - Instr::kInstrSize);
   } else if (instr->BreakCodeField() == Instr::kRedirectCode) {
     SimulatorSetjmpBuffer buffer(this);
 
     if (!setjmp(buffer.buffer_)) {
       int32_t saved_ra = get_register(RA);
       Redirection* redirection = Redirection::FromBreakInstruction(instr);
       uword external = redirection->external_function();
       if (FLAG_trace_sim) {
         OS::Print("Call to host function at 0x%"Pd"\n", external);
       }
@@ skipping 62 matching lines @@
       for (int i = F0; i <= F31; i++) {
         set_fregister(static_cast<FRegister>(i), zap_dvalue);
       }
 
       // Return. Subtract to account for pc_ increment after return.
       set_pc(saved_ra - Instr::kInstrSize);
     }
   } else {
     SimulatorDebugger dbg(this);
     dbg.Stop(instr, "breakpoint");
+    // Adjust for extra pc increment.
+    set_pc(get_pc() - Instr::kInstrSize);
   }
 }
 
 
 void Simulator::DecodeSpecial(Instr* instr) {
   ASSERT(instr->OpcodeField() == SPECIAL);
   switch (instr->FunctionField()) {
     case ADDU: {
       ASSERT(instr->SaField() == 0);
       // Format(instr, "addu 'rd, 'rs, 'rt");
@@ skipping 699 matching lines @@
   // Restore the SP register and return R1:R0.
   set_register(SP, sp_before_call);
   return Utils::LowHighTo64Bits(get_register(V0), get_register(V1));
 }
 
 }  // namespace dart
 
 #endif  // !defined(HOST_ARCH_MIPS)
 
 #endif  // defined TARGET_ARCH_MIPS