Add --check-code-pointer flag for debug builds

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"  // NOLINT
 #if defined(TARGET_ARCH_MIPS)
 
 #include "vm/assembler.h"
 #include "vm/longjump.h"
 #include "vm/runtime_entry.h"
 #include "vm/simulator.h"
 #include "vm/stack_frame.h"
 #include "vm/stub_code.h"
 
 namespace dart {
 
+DECLARE_FLAG(bool, allow_absolute_addresses);
+DECLARE_FLAG(bool, check_code_pointer);
+DECLARE_FLAG(bool, inline_alloc);
 #if defined(USING_SIMULATOR)
 DECLARE_FLAG(int, trace_sim_after);
 #endif
-DECLARE_FLAG(bool, allow_absolute_addresses);
+
 DEFINE_FLAG(bool, print_stop_message, false, "Print stop message.");
-DECLARE_FLAG(bool, inline_alloc);
 
 void Assembler::InitializeMemoryWithBreakpoints(uword data, intptr_t 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 421 matching lines @@
     subu(rd, rs, rt);
     xor_(ro, rd, rs);
     xor_(TMP, rs, rt);
     and_(ro, TMP, ro);
   }
 }
 
 
 void Assembler::CheckCodePointer() {
 #ifdef DEBUG
+  if (!FLAG_check_code_pointer) {
+    return;
+  }
   Comment("CheckCodePointer");
   Label cid_ok, instructions_ok;
   Push(CMPRES1);
   Push(CMPRES2);
   LoadClassId(CMPRES1, CODE_REG);
   BranchEqual(CMPRES1, Immediate(kCodeCid), &cid_ok);
   break_(0);
   Bind(&cid_ok);
   GetNextPC(CMPRES1, TMP);
   const intptr_t entry_offset = CodeSize() - Instr::kInstrSize +
@@ skipping 862 matching lines @@
   Label stop;
   b(&stop);
   Emit(reinterpret_cast<int32_t>(message));
   Bind(&stop);
   break_(Instr::kStopMessageCode);
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS