[inspector] added Debugger.getPossibleBreakpoints method

src/api.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/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 8908 matching lines @@
 MaybeLocal<String> DebugInterface::Script::Source() const {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   i::HandleScope handle_scope(isolate);
   i::Handle<i::Script> script = Utils::OpenHandle(this);
   i::Handle<i::Object> value(script->source(), isolate);
   if (!value->IsString()) return MaybeLocal<String>();
   return Utils::ToLocal(
       handle_scope.CloseAndEscape(i::Handle<i::String>::cast(value)));
 }
 
+bool DebugInterface::Script::GetPossibleBreakpoints(
+    const Location& start, const Location& end,
+    std::vector<Location>* locations) const {
+  CHECK(!start.IsEmpty());
+  i::Handle<i::Script> script = Utils::OpenHandle(this);
+  int start_offset = GetSourcePosition(start);
+  int end_offset;
+  if (end.IsEmpty())
+    end_offset = LineEnds().back() + 1;
+  else
+    end_offset = GetSourcePosition(end);
+  if (start_offset >= end_offset) return true;
+
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
+  std::vector<int> offsets;
+  if (!isolate->debug()->GetPossibleBreakpoints(script, start_offset,
+                                                end_offset, &offsets))
+    return false;
+  std::set<int> unique_offsets;
+  for (size_t i = 0; i < offsets.size(); ++i) unique_offsets.insert(offsets[i]);
+
+  int current_line_end_index = 0;
+  std::vector<int> line_endings = LineEnds();
+  for (const auto& it : unique_offsets) {
+    int offset = it;
+    while (offset > line_endings[current_line_end_index] &&

[dgozman, 2016/11/03 21:13:12]

while (offset > ...) {
  index++;
  CHECK(index < )
}

[kozy, 2016/11/03 22:17:13]

Done.

+           current_line_end_index < line_endings.size())
+      ++current_line_end_index;
+    CHECK(current_line_end_index < line_endings.size());
+    int line_offset = current_line_end_index > 0
+                          ? (line_endings[current_line_end_index - 1] + 1)
+                          : 0;
+    locations->push_back(
+        Location(current_line_end_index, offset - line_offset));
+  }
+  return true;
+}
+
+int DebugInterface::Script::GetSourcePosition(const Location& location) const {
+  i::Handle<i::Script> script = Utils::OpenHandle(this);
+  std::vector<int> line_endings = LineEnds();

[dgozman, 2016/11/03 21:13:12]

Can we cache line endings?

[kozy, 2016/11/03 22:17:13]

Done.

+  int line = location.GetLineNumber();
+  int column = location.GetColumnNumber();
+  if (line == 0) return std::min(column, line_endings[line]);
+  if (line >= line_endings.size()) return line_endings.back();
+  return std::min(line_endings[line - 1] + column + 1, line_endings[line]);
+}
+
 MaybeLocal<DebugInterface::Script> DebugInterface::Script::Wrap(
     v8::Isolate* v8_isolate, v8::Local<v8::Object> script) {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
   ENTER_V8(isolate);
   i::HandleScope handle_scope(isolate);
   i::Handle<i::JSReceiver> script_receiver(Utils::OpenHandle(*script));
   if (!script_receiver->IsJSValue()) return MaybeLocal<Script>();
   i::Handle<i::Object> script_value(
       i::Handle<i::JSValue>::cast(script_receiver)->value(), isolate);
   if (!script_value->IsScript()) {
     return MaybeLocal<Script>();
   }
   i::Handle<i::Script> script_obj = i::Handle<i::Script>::cast(script_value);
   if (script_obj->type() != i::Script::TYPE_NORMAL) return MaybeLocal<Script>();
   return ToApiHandle<DebugInterface::Script>(
       handle_scope.CloseAndEscape(script_obj));
 }
 
+DebugInterface::Script::Location::Location(int lineNumber, int columnNumber)
+    : lineNumber_(lineNumber), columnNumber_(columnNumber) {
+  CHECK(lineNumber >= 0);
+  CHECK(columnNumber >= 0);
+}
+DebugInterface::Script::Location::Location()
+    : lineNumber_(-1), columnNumber_(-1) {}
+
+int DebugInterface::Script::Location::GetLineNumber() const {
+  CHECK(lineNumber_ >= 0);
+  return lineNumber_;
+}
+int DebugInterface::Script::Location::GetColumnNumber() const {

[dgozman, 2016/11/03 21:13:12]

where are the empty lines?

[kozy, 2016/11/03 22:17:13]

Done.

+  CHECK(columnNumber_ >= 0);
+  return columnNumber_;
+}
+
+bool DebugInterface::Script::Location::IsEmpty() const {
+  return lineNumber_ == -1 && columnNumber_ == -1;
+}
+
 void DebugInterface::GetLoadedScripts(
     v8::Isolate* v8_isolate,
     PersistentValueVector<DebugInterface::Script>& scripts) {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(v8_isolate);
   ENTER_V8(isolate);
   i::HandleScope handle_scope(isolate);
   i::Handle<i::FixedArray> instances = isolate->debug()->GetLoadedScripts();
   for (int i = 0; i < instances->length(); i++) {
     i::Handle<i::Script> script =
         i::Handle<i::Script>(i::Script::cast(instances->get(i)));
@@ skipping 683 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8