[liveedit] reimplement frame restarting.

src/debug/liveedit.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_LIVEEDIT_H_
 #define V8_DEBUG_LIVEEDIT_H_
 
 
 // Live Edit feature implementation.
 // User should be able to change script on already running VM. This feature
@@ skipping 56 matching lines @@
   int current_parent_index_;
 
   DISALLOW_COPY_AND_ASSIGN(LiveEditFunctionTracker);
 };
 
 
 class LiveEdit : AllStatic {
  public:
   static void InitializeThreadLocal(Debug* debug);
 
-  static bool SetAfterBreakTarget(Debug* debug);
-
   MUST_USE_RESULT static MaybeHandle<JSArray> GatherCompileInfo(
       Handle<Script> script,
       Handle<String> source);
 
   static void ReplaceFunctionCode(Handle<JSArray> new_compile_info_array,
                                   Handle<JSArray> shared_info_array);
 
   static void FixupScript(Handle<Script> script, int max_function_literal_id);
 
   static void FunctionSourceUpdated(Handle<JSArray> shared_info_array,
@@ skipping 50 matching lines @@
   };
 
   // Compares 2 strings line-by-line, then token-wise and returns diff in form
   // of array of triplets (pos1, pos1_end, pos2_end) describing list
   // of diff chunks.
   static Handle<JSArray> CompareStrings(Handle<String> s1,
                                         Handle<String> s2);
 
   // Architecture-specific constant.
   static const bool kFrameDropperSupported;
-
-  /**
-   * Defines layout of a stack frame that supports padding. This is a regular
-   * internal frame that has a flexible stack structure. LiveEdit can shift
-   * its lower part up the stack, taking up the 'padding' space when additional
-   * stack memory is required.
-   * Such frame is expected immediately above the topmost JavaScript frame.
-   *
-   * Stack Layout:
-   *   --- Top
-   *   LiveEdit routine frames
-   *   ---
-   *   C frames of debug handler
-   *   ---
-   *   ...
-   *   ---
-   *      An internal frame that has n padding words:
-   *      - any number of words as needed by code -- upper part of frame
-   *      - padding size: a Smi storing n -- current size of padding
-   *      - padding: n words filled with kPaddingValue in form of Smi
-   *      - 3 context/type words of a regular InternalFrame
-   *      - fp
-   *   ---
-   *      Topmost JavaScript frame
-   *   ---
-   *   ...
-   *   --- Bottom
-   */
-  // A number of words that should be reserved on stack for the LiveEdit use.
-  // Stored on stack in form of Smi.
-  static const int kFramePaddingInitialSize = 1;
-  // A value that padding words are filled with (in form of Smi). Going
-  // bottom-top, the first word not having this value is a counter word.
-  static const int kFramePaddingValue = kFramePaddingInitialSize + 1;
 };
 
 
 // A general-purpose comparator between 2 arrays.
 class Comparator {
  public:
   // Holds 2 arrays of some elements allowing to compare any pair of
   // element from the first array and element from the second array.
   class Input {
    public:
@@ skipping 160 matching lines @@
   static const int kSharedInfoOffset_ = 3;
   static const int kSize_ = 4;
 
   friend class JSArrayBasedStruct<SharedInfoWrapper>;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif /* V8_DEBUG_LIVEEDIT_H_ */