Debugger: refactor reloc info.

src/arm64/debug-arm64.cc

 // Copyright 2013 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.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/codegen.h"
 #include "src/debug.h"
@@ skipping 38 matching lines @@
   // this call site will be registered in the frame (lr being saved as the pc
   // of the next instruction to execute for this frame). The debugger can now
   // iterate on the frames to find call to debug break return code.
   patcher.blr(ip0);
   patcher.hlt(kHltBadCode);
   patcher.dc64(reinterpret_cast<int64_t>(entry));
 }
 
 
 void BreakLocation::SetDebugBreakAtSlot() {
+  DCHECK(IsDebugBreakSlot());
   // Patch the code emitted by DebugCodegen::GenerateSlots, changing the debug
   // break slot code from
   //   mov x0, x0    @ nop DEBUG_BREAK_NOP
   //   mov x0, x0    @ nop DEBUG_BREAK_NOP
   //   mov x0, x0    @ nop DEBUG_BREAK_NOP
   //   mov x0, x0    @ nop DEBUG_BREAK_NOP
   // to a call to the debug slot code.
   //   ldr ip0, [pc, #(2 * kInstructionSize)]
   //   blr ip0
   //   <debug break slot code ...
@@ skipping 150 matching lines @@
   __ Br(scratch);
 }
 
 
 const bool LiveEdit::kFrameDropperSupported = true;
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64