[objects] Extract DebugInfo and BreakPointInfo to own file

src/objects/debug-info.cc

+// Copyright 2017 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/objects/debug-info.h"
+
+#include "src/objects-inl.h"
+
+namespace v8 {
+namespace internal {
+
+// Check if there is a break point at this source position.
+bool DebugInfo::HasBreakPoint(int source_position) {
+  // Get the break point info object for this code offset.
+  Object* break_point_info = GetBreakPointInfo(source_position);
+
+  // If there is no break point info object or no break points in the break
+  // point info object there is no break point at this code offset.
+  if (break_point_info->IsUndefined(GetIsolate())) return false;
+  return BreakPointInfo::cast(break_point_info)->GetBreakPointCount() > 0;
+}
+
+// Get the break point info object for this source position.
+Object* DebugInfo::GetBreakPointInfo(int source_position) {
+  Isolate* isolate = GetIsolate();
+  if (!break_points()->IsUndefined(isolate)) {
+    for (int i = 0; i < break_points()->length(); i++) {
+      if (!break_points()->get(i)->IsUndefined(isolate)) {
+        BreakPointInfo* break_point_info =
+            BreakPointInfo::cast(break_points()->get(i));
+        if (break_point_info->source_position() == source_position) {
+          return break_point_info;
+        }
+      }
+    }
+  }
+  return isolate->heap()->undefined_value();
+}
+
+bool DebugInfo::ClearBreakPoint(Handle<DebugInfo> debug_info,
+                                Handle<Object> break_point_object) {
+  Isolate* isolate = debug_info->GetIsolate();
+  if (debug_info->break_points()->IsUndefined(isolate)) return false;
+
+  for (int i = 0; i < debug_info->break_points()->length(); i++) {
+    if (debug_info->break_points()->get(i)->IsUndefined(isolate)) continue;
+    Handle<BreakPointInfo> break_point_info = Handle<BreakPointInfo>(
+        BreakPointInfo::cast(debug_info->break_points()->get(i)), isolate);
+    if (BreakPointInfo::HasBreakPointObject(break_point_info,
+                                            break_point_object)) {
+      BreakPointInfo::ClearBreakPoint(break_point_info, break_point_object);
+      return true;
+    }
+  }
+  return false;
+}
+
+void DebugInfo::SetBreakPoint(Handle<DebugInfo> debug_info, int source_position,
+                              Handle<Object> break_point_object) {
+  Isolate* isolate = debug_info->GetIsolate();
+  Handle<Object> break_point_info(
+      debug_info->GetBreakPointInfo(source_position), isolate);
+  if (!break_point_info->IsUndefined(isolate)) {
+    BreakPointInfo::SetBreakPoint(
+        Handle<BreakPointInfo>::cast(break_point_info), break_point_object);
+    return;
+  }
+
+  // Adding a new break point for a code offset which did not have any
+  // break points before. Try to find a free slot.
+  static const int kNoBreakPointInfo = -1;
+  int index = kNoBreakPointInfo;
+  for (int i = 0; i < debug_info->break_points()->length(); i++) {
+    if (debug_info->break_points()->get(i)->IsUndefined(isolate)) {
+      index = i;
+      break;
+    }
+  }
+  if (index == kNoBreakPointInfo) {
+    // No free slot - extend break point info array.
+    Handle<FixedArray> old_break_points = Handle<FixedArray>(
+        FixedArray::cast(debug_info->break_points()), isolate);
+    Handle<FixedArray> new_break_points = isolate->factory()->NewFixedArray(
+        old_break_points->length() +
+        DebugInfo::kEstimatedNofBreakPointsInFunction);
+
+    debug_info->set_break_points(*new_break_points);
+    for (int i = 0; i < old_break_points->length(); i++) {
+      new_break_points->set(i, old_break_points->get(i));
+    }
+    index = old_break_points->length();
+  }
+  DCHECK(index != kNoBreakPointInfo);
+
+  // Allocate new BreakPointInfo object and set the break point.
+  Handle<BreakPointInfo> new_break_point_info =
+      isolate->factory()->NewBreakPointInfo(source_position);
+  BreakPointInfo::SetBreakPoint(new_break_point_info, break_point_object);
+  debug_info->break_points()->set(index, *new_break_point_info);
+}
+
+// Get the break point objects for a source position.
+Handle<Object> DebugInfo::GetBreakPointObjects(int source_position) {
+  Object* break_point_info = GetBreakPointInfo(source_position);
+  Isolate* isolate = GetIsolate();
+  if (break_point_info->IsUndefined(isolate)) {
+    return isolate->factory()->undefined_value();
+  }
+  return Handle<Object>(
+      BreakPointInfo::cast(break_point_info)->break_point_objects(), isolate);
+}
+
+// Get the total number of break points.
+int DebugInfo::GetBreakPointCount() {
+  Isolate* isolate = GetIsolate();
+  if (break_points()->IsUndefined(isolate)) return 0;
+  int count = 0;
+  for (int i = 0; i < break_points()->length(); i++) {
+    if (!break_points()->get(i)->IsUndefined(isolate)) {
+      BreakPointInfo* break_point_info =
+          BreakPointInfo::cast(break_points()->get(i));
+      count += break_point_info->GetBreakPointCount();
+    }
+  }
+  return count;
+}
+
+Handle<Object> DebugInfo::FindBreakPointInfo(
+    Handle<DebugInfo> debug_info, Handle<Object> break_point_object) {
+  Isolate* isolate = debug_info->GetIsolate();
+  if (!debug_info->break_points()->IsUndefined(isolate)) {
+    for (int i = 0; i < debug_info->break_points()->length(); i++) {
+      if (!debug_info->break_points()->get(i)->IsUndefined(isolate)) {
+        Handle<BreakPointInfo> break_point_info = Handle<BreakPointInfo>(
+            BreakPointInfo::cast(debug_info->break_points()->get(i)), isolate);
+        if (BreakPointInfo::HasBreakPointObject(break_point_info,
+                                                break_point_object)) {
+          return break_point_info;
+        }
+      }
+    }
+  }
+  return isolate->factory()->undefined_value();
+}
+
+}  // namespace internal
+}  // namespace v8