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

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"  // NOLINT
 #if defined(TARGET_ARCH_ARM)
 
 #include "vm/assembler.h"
 #include "vm/cpu.h"
 #include "vm/longjump.h"
 #include "vm/runtime_entry.h"
 #include "vm/simulator.h"
 #include "vm/stack_frame.h"
 #include "vm/stub_code.h"
 
 // An extra check since we are assuming the existence of /proc/cpuinfo below.
 #if !defined(USING_SIMULATOR) && !defined(__linux__) && !defined(ANDROID) && \
     !TARGET_OS_IOS
 #error ARM cross-compile only supported on Linux
 #endif
 
 namespace dart {
 
 DECLARE_FLAG(bool, allow_absolute_addresses);
+DECLARE_FLAG(bool, check_code_pointer);
+DECLARE_FLAG(bool, inline_alloc);
+
 DEFINE_FLAG(bool, print_stop_message, true, "Print stop message.");
-DECLARE_FLAG(bool, inline_alloc);
 
 uint32_t Address::encoding3() const {
   if (kind_ == Immediate) {
     uint32_t offset = encoding_ & kOffset12Mask;
     ASSERT(offset < 256);
     return (encoding_ & ~kOffset12Mask) | B22 |
            ((offset & 0xf0) << 4) | (offset & 0xf);
   }
   ASSERT(kind_ == IndexRegister);
   return encoding_;
@@ skipping 1474 matching lines @@
     } else {
       LoadImmediate(rd, offset_hi, cond);
       add(rd, pp, Operand(rd), cond);
     }
     ldr(rd, Address(rd, offset_lo), cond);
   }
 }
 
 void Assembler::CheckCodePointer() {
 #ifdef DEBUG
+  if (!FLAG_check_code_pointer) {
+    return;
+  }
   Comment("CheckCodePointer");
   Label cid_ok, instructions_ok;
   Push(R0);
   Push(IP);
   CompareClassId(CODE_REG, kCodeCid, R0);
   b(&cid_ok, EQ);
   bkpt(0);
   Bind(&cid_ok);
 
   const intptr_t offset = CodeSize() + Instr::kPCReadOffset +
@@ skipping 2131 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