[debugger] introduce abstract interface for break location.

src/x64/assembler-x64-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_X64_ASSEMBLER_X64_INL_H_
 #define V8_X64_ASSEMBLER_X64_INL_H_
 
 #include "src/x64/assembler-x64.h"
 
 #include "src/base/cpu.h"
@@ skipping 458 matching lines @@
   } else if (IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_)) {
     // Effectively write zero into the relocation.
     Assembler::set_target_address_at(isolate_, pc_, host_,
                                      pc_ + sizeof(int32_t));
   } else {
     UNREACHABLE();
   }
 }
 
 
-bool RelocInfo::IsPatchedReturnSequence() {
-  // The recognized call sequence is:
-  //  movq(kScratchRegister, address); call(kScratchRegister);
-  // It only needs to be distinguished from a return sequence
-  //  movq(rsp, rbp); pop(rbp); ret(n); int3 *6
-  // The 11th byte is int3 (0xCC) in the return sequence and
-  // REX.WB (0x48+register bit) for the call sequence.
-  return pc_[Assembler::kMoveAddressIntoScratchRegisterInstructionLength] !=
-         0xCC;
-}
-
-
-bool RelocInfo::IsPatchedDebugBreakSlotSequence() {
-  return !Assembler::IsNop(pc());
-}
-
-
 Handle<Object> RelocInfo::code_age_stub_handle(Assembler* origin) {
   DCHECK(rmode_ == RelocInfo::CODE_AGE_SEQUENCE);
   DCHECK(*pc_ == kCallOpcode);
   return origin->code_target_object_handle_at(pc_ + 1);
 }
 
 
 Code* RelocInfo::code_age_stub() {
   DCHECK(rmode_ == RelocInfo::CODE_AGE_SEQUENCE);
   DCHECK(*pc_ == kCallOpcode);
@@ skipping 121 matching lines @@
 void Operand::set_disp64(int64_t disp) {
   DCHECK_EQ(1, len_);
   int64_t* p = reinterpret_cast<int64_t*>(&buf_[len_]);
   *p = disp;
   len_ += sizeof(disp);
 }
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_X64_ASSEMBLER_X64_INL_H_