[inspector] added restrictToFunction flag for getPossibleBreakpoints

src/debug/debug.cc

 // 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.
 
 #include "src/debug/debug.h"
 
 #include <memory>
 
 #include "src/api.h"
 #include "src/arguments.h"
@@ skipping 1324 matching lines @@
   } else {
     DCHECK(debug_info->HasDebugBytecodeArray());
     BytecodeArrayBreakIterator it(debug_info);
     GetBreakablePositions(&it, start_position, end_position, alignment,
                           positions);
   }
 }
 }  // namespace
 
 bool Debug::GetPossibleBreakpoints(Handle<Script> script, int start_position,
-                                   int end_position, std::set<int>* positions) {
+                                   int end_position, bool restrict_to_function,
+                                   std::set<int>* positions) {
+  if (restrict_to_function) {
+    Handle<Object> result =
+        FindSharedFunctionInfoInScript(script, start_position);
+    if (result->IsUndefined(isolate_)) return false;
+
+    // Make sure the function has set up the debug info.
+    Handle<SharedFunctionInfo> shared =
+        Handle<SharedFunctionInfo>::cast(result);
+    if (!EnsureDebugInfo(shared)) return false;
+
+    Handle<DebugInfo> debug_info(shared->GetDebugInfo());
+    FindBreakablePositions(debug_info, start_position, end_position,
+                           BREAK_POSITION_ALIGNED, positions);
+    return true;
+  }
+
   while (true) {
     HandleScope scope(isolate_);
     List<Handle<SharedFunctionInfo>> candidates;
     SharedFunctionInfo::ScriptIterator iterator(script);
     for (SharedFunctionInfo* info = iterator.Next(); info != nullptr;
          info = iterator.Next()) {
       if (info->end_position() < start_position ||
           info->start_position() >= end_position) {
         continue;
       }
@@ skipping 1052 matching lines @@
     isolate_->Throw(*isolate_->factory()->NewEvalError(
         MessageTemplate::kNoSideEffectDebugEvaluate));
   }
   isolate_->set_needs_side_effect_check(old_needs_side_effect_check_);
   isolate_->debug()->UpdateHookOnFunctionCall();
   isolate_->debug()->side_effect_check_failed_ = false;
 }
 
 }  // namespace internal
 }  // namespace v8