Write protect executable pages in the VM.

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/longjump.h"
 #include "vm/runtime_entry.h"
@@ skipping 88 matching lines @@
           EncodeLoadImmediate(dest >> 16, high);
 
       region.Store<int32_t>(position, encoded_high);
       region.Store<int32_t>(position + Instr::kInstrSize, encoded_low);
       return;
     }
     // If the offset loading instructions aren't there, we must have replaced
     // the far branch with a near one, and so these instructions should be NOPs.
     ASSERT((high == Instr::kNopInstruction) && (low == Instr::kNopInstruction));
   }
+
+  virtual bool IsPointerOffset() const { return false; }
 };
 
 
 void Assembler::EmitFarJump(int32_t offset, bool link) {
   ASSERT(use_far_branches());
   const uint16_t low = Utils::Low16Bits(offset);
   const uint16_t high = Utils::High16Bits(offset);
   buffer_.EmitFixup(new PatchFarJump());
   lui(TMP, Immediate(high));
   ori(TMP, TMP, Immediate(low));
@@ skipping 847 matching lines @@
     Emit(reinterpret_cast<int32_t>(message));
     Bind(&msg);
     break_(Instr::kMsgMessageCode);
   }
 #endif
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS