Landing: Write protect executable pages in the VM.

runtime/vm/assembler_arm.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_ARM)
 
 #include "vm/assembler.h"
 #include "vm/cpu.h"
 #include "vm/longjump.h"
@@ skipping 1690 matching lines @@
       region.Store<int32_t>(position, patched_movw);
       region.Store<int32_t>(position + Instr::kInstrSize, patched_movt);
       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((movt == Instr::kNopInstruction) &&
            (bx == Instr::kNopInstruction));
   }
+
+  virtual bool IsPointerOffset() const { return false; }
 };
 
 
 void Assembler::EmitFarBranch(Condition cond, int32_t offset, bool link) {
   const uint16_t low = Utils::Low16Bits(offset);
   const uint16_t high = Utils::High16Bits(offset);
   buffer_.EmitFixup(new PatchFarBranch());
   movw(IP, low);
   movt(IP, high);
   if (link) {
@@ skipping 1031 matching lines @@
 
 
 const char* Assembler::FpuRegisterName(FpuRegister reg) {
   ASSERT((0 <= reg) && (reg < kNumberOfFpuRegisters));
   return fpu_reg_names[reg];
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM