[debugger] negative conditional break points mute breaks and exceptions.

src/debug/debug.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_DEBUG_DEBUG_H_
 #define V8_DEBUG_DEBUG_H_
 
 #include "src/allocation.h"
 #include "src/arguments.h"
 #include "src/assembler.h"
@@ skipping 48 matching lines @@
   BREAK_POSITION_ALIGNED = 1
 };
 
 
 class BreakLocation {
  public:
   // Find the break point at the supplied address, or the closest one before
   // the address.
   static BreakLocation FromAddress(Handle<DebugInfo> debug_info, Address pc);
 
+  template <class Frame>
+  static BreakLocation FromFrame(Handle<DebugInfo> debug_info, Frame* frame) {
+    // PC points to the instruction after the current one, possibly a break
+    // location as well. So the "- 1" to exclude it from the search.
+    return FromAddress(debug_info, frame->pc() - 1);
+  }
+
   static void FromAddressSameStatement(Handle<DebugInfo> debug_info, Address pc,
                                        List<BreakLocation>* result_out);
 
   static BreakLocation FromPosition(Handle<DebugInfo> debug_info, int position,
                                     BreakPositionAlignment alignment);
 
   bool IsDebugBreak() const;
 
   inline bool IsReturn() const {
     return RelocInfo::IsDebugBreakSlotAtReturn(rmode_);
@@ skipping 468 matching lines @@
                          bool auto_continue);
   void NotifyMessageHandler(v8::DebugEvent event,
                             Handle<JSObject> exec_state,
                             Handle<JSObject> event_data,
                             bool auto_continue);
   void InvokeMessageHandler(MessageImpl message);
 
   void ClearOneShot();
   void ActivateStepOut(StackFrame* frame);
   void RemoveDebugInfoAndClearFromShared(Handle<DebugInfo> debug_info);
-  Handle<Object> CheckBreakPoints(Handle<Object> break_point);
+  Handle<Object> CheckBreakPoints(BreakLocation* location,
+                                  bool* has_break_points = nullptr);
+  bool IsMutedAtCurrentLocation(JavaScriptFrame* frame);
   bool CheckBreakPoint(Handle<Object> break_point_object);
   MaybeHandle<Object> CallFunction(const char* name, int argc,
                                    Handle<Object> args[]);
 
   inline void AssertDebugContext() {
     DCHECK(isolate_->context() == *debug_context());
     DCHECK(in_debug_scope());
   }
 
   void ThreadInit();
@@ skipping 171 matching lines @@
   static void PatchDebugBreakSlot(Isolate* isolate, Address pc,
                                   Handle<Code> code);
   static void ClearDebugBreakSlot(Isolate* isolate, Address pc);
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_DEBUG_DEBUG_H_