[debugger] introduce abstract interface for break location.

src/mips64/assembler-mips64-inl.h

 
 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
@@ skipping 329 matching lines @@
   if (IsInternalReference(rmode_)) {
     Memory::Address_at(pc_) = NULL;
   } else if (IsInternalReferenceEncoded(rmode_)) {
     Assembler::set_target_internal_reference_encoded_at(pc_, nullptr);
   } else {
     Assembler::set_target_address_at(isolate_, pc_, host_, NULL);
   }
 }
 
 
-bool RelocInfo::IsPatchedReturnSequence() {
-  Instr instr0 = Assembler::instr_at(pc_);  // lui.
-  Instr instr1 = Assembler::instr_at(pc_ + 1 * Assembler::kInstrSize);  // ori.
-  Instr instr2 = Assembler::instr_at(pc_ + 2 * Assembler::kInstrSize);  // dsll.
-  Instr instr3 = Assembler::instr_at(pc_ + 3 * Assembler::kInstrSize);  // ori.
-  Instr instr4 = Assembler::instr_at(pc_ + 4 * Assembler::kInstrSize);  // jalr.
-
-  bool patched_return = ((instr0 & kOpcodeMask) == LUI &&
-                         (instr1 & kOpcodeMask) == ORI &&
-                         (instr2 & kFunctionFieldMask) == DSLL &&
-                         (instr3 & kOpcodeMask) == ORI &&
-                         (instr4 & kFunctionFieldMask) == JALR);
-  return patched_return;
-}
-
-
-bool RelocInfo::IsPatchedDebugBreakSlotSequence() {
-  Instr current_instr = Assembler::instr_at(pc_);
-  return !Assembler::IsNop(current_instr, Assembler::DEBUG_BREAK_NOP);
-}
-
-
 void RelocInfo::Visit(Isolate* isolate, ObjectVisitor* visitor) {
   RelocInfo::Mode mode = rmode();
   if (mode == RelocInfo::EMBEDDED_OBJECT) {
     visitor->VisitEmbeddedPointer(this);
   } else if (RelocInfo::IsCodeTarget(mode)) {
     visitor->VisitCodeTarget(this);
   } else if (mode == RelocInfo::CELL) {
     visitor->VisitCell(this);
   } else if (mode == RelocInfo::EXTERNAL_REFERENCE) {
     visitor->VisitExternalReference(this);
@@ skipping 107 matching lines @@
 void Assembler::emit(uint64_t data) {
   CheckForEmitInForbiddenSlot();
   EmitHelper(data);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_MIPS_ASSEMBLER_MIPS_INL_H_