Debugger: refactor ScopeIterator, FrameInspector and DebugEvaluate.

src/debug/debug-frames.h

+// Copyright 2015 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_FRAMES_H_
+#define V8_DEBUG_DEBUG_FRAMES_H_
+
+#include "src/deoptimizer.h"
+#include "src/frames.h"
+#include "src/isolate.h"
+#include "src/objects.h"
+
+namespace v8 {
+namespace internal {
+
+class FrameInspector {
+ public:
+  FrameInspector(JavaScriptFrame* frame, int inlined_jsframe_index,
+                 Isolate* isolate);
+
+  ~FrameInspector();
+
+  int GetParametersCount();
+  int expression_count();
+  Object* GetFunction();
+  Object* GetParameter(int index);
+  Object* GetExpression(int index);
+  int GetSourcePosition();
+  bool IsConstructor();
+  Object* GetContext();
+
+  JavaScriptFrame* GetArgumentsFrame() { return frame_; }
+  void SetArgumentsFrame(JavaScriptFrame* frame);
+
+  void MaterializeStackLocals(Handle<JSObject> target,
+                              Handle<ScopeInfo> scope_info);
+
+  void MaterializeStackLocals(Handle<JSObject> target,
+                              Handle<JSFunction> function);
+
+  void UpdateStackLocalsFromMaterializedObject(Handle<JSObject> object,
+                                               Handle<ScopeInfo> scope_info);
+
+ private:
+  bool ParameterIsShadowedByContextLocal(Handle<ScopeInfo> info,
+                                         Handle<String> parameter_name);
+
+  JavaScriptFrame* frame_;
+  DeoptimizedFrameInfo* deoptimized_frame_;
+  Isolate* isolate_;
+  bool is_optimized_;
+  bool is_bottommost_;
+  bool has_adapted_arguments_;
+
+  DISALLOW_COPY_AND_ASSIGN(FrameInspector);
+};
+
+
+class DebugFrameHelper : public AllStatic {
+ public:
+  static SaveContext* FindSavedContextForFrame(Isolate* isolate,
+                                               JavaScriptFrame* frame);
+  // Advances the iterator to the frame that matches the index and returns the
+  // inlined frame index, or -1 if not found.  Skips native JS functions.
+  static int FindIndexedNonNativeFrame(JavaScriptFrameIterator* it, int index);
+
+  // Helper functions for wrapping and unwrapping stack frame ids.
+  static Smi* WrapFrameId(StackFrame::Id id) {
+    DCHECK(IsAligned(OffsetFrom(id), static_cast<intptr_t>(4)));
+    return Smi::FromInt(id >> 2);
+  }
+
+  static StackFrame::Id UnwrapFrameId(int wrapped) {
+    return static_cast<StackFrame::Id>(wrapped << 2);
+  }
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_DEBUG_DEBUG_FRAMES_H_