Move LiveEdit-related code.

src/debug.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_H_
 #define V8_DEBUG_H_
 
 #include "allocation.h"
 #include "arguments.h"
 #include "assembler.h"
 #include "execution.h"
 #include "factory.h"
 #include "flags.h"
 #include "frames-inl.h"
 #include "hashmap.h"
+#include "liveedit.h"
 #include "platform.h"
 #include "string-stream.h"
 #include "v8threads.h"
 
 #include "../include/v8-debug.h"
 
 namespace v8 {
 namespace internal {
 
 
@@ skipping 499 matching lines @@
   void set_disable_break(bool disable_break) {
     disable_break_ = disable_break;
   }
 
   // Getters for the current exception break state.
   bool break_on_exception() { return break_on_exception_; }
   bool break_on_uncaught_exception() {
     return break_on_uncaught_exception_;
   }
 
-  enum AddressId {
-    k_after_break_target_address,
-    k_restarter_frame_function_pointer
-  };
+  void FramesHaveBeenDropped(StackFrame::Id new_break_frame_id,
+                             LiveEdit::FrameDropMode mode,
+                             Object** restarter_frame_function_pointer);
 
   // Support for setting the address to jump to when returning from break point.
   Address after_break_target_address() {
     return reinterpret_cast<Address>(&thread_local_.after_break_target_);
   }
 
   Address restarter_frame_function_pointer_address() {
     Object*** address = &thread_local_.restarter_frame_function_pointer_;
     return reinterpret_cast<Address>(address);
   }
 
-  static const int kEstimatedNofDebugInfoEntries = 16;
   static const int kEstimatedNofBreakPointsInFunction = 16;
 
   // Passed to MakeWeak.
   static void HandleWeakDebugInfo(
       const v8::WeakCallbackData<v8::Value, void>& data);
 
   friend Handle<FixedArray> GetDebuggedFunctions();  // In test-debug.cc
   friend void CheckDebuggerUnloaded(bool check_functions);  // In test-debug.cc
 
   // Threading support.
@@ skipping 10 matching lines @@
   void DestroyScriptCache();
   void AddScriptToScriptCache(Handle<Script> script);
   Handle<FixedArray> GetLoadedScripts();
 
   // Record function from which eval was called.
   static void RecordEvalCaller(Handle<Script> script);
 
   // Garbage collection notifications.
   void AfterGarbageCollection();
 
-  // Describes how exactly a frame has been dropped from stack.
-  enum FrameDropMode {
-    // No frame has been dropped.
-    FRAMES_UNTOUCHED,
-    // The top JS frame had been calling IC stub. IC stub mustn't be called now.
-    FRAME_DROPPED_IN_IC_CALL,
-    // The top JS frame had been calling debug break slot stub. Patch the
-    // address this stub jumps to in the end.
-    FRAME_DROPPED_IN_DEBUG_SLOT_CALL,
-    // The top JS frame had been calling some C++ function. The return address
-    // gets patched automatically.
-    FRAME_DROPPED_IN_DIRECT_CALL,
-    FRAME_DROPPED_IN_RETURN_CALL,
-    CURRENTLY_SET_MODE
-  };
-
-  void FramesHaveBeenDropped(StackFrame::Id new_break_frame_id,
-                                    FrameDropMode mode,
-                                    Object** restarter_frame_function_pointer);
-
-  // Initializes an artificial stack frame. The data it contains is used for:
-  //  a. successful work of frame dropper code which eventually gets control,
-  //  b. being compatible with regular stack structure for various stack
-  //     iterators.
-  // Returns address of stack allocated pointer to restarted function,
-  // the value that is called 'restarter_frame_function_pointer'. The value
-  // at this address (possibly updated by GC) may be used later when preparing
-  // 'step in' operation.
-  static Object** SetUpFrameDropperFrame(StackFrame* bottom_js_frame,
-                                         Handle<Code> code);
-
-  static const int kFrameDropperFrameSize;
-
-  // 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
-   */
-  class FramePaddingLayout : public AllStatic {
-   public:
-    // Architecture-specific constant.
-    static const bool kIsSupported;
-
-    // A size of frame base including fp. Padding words starts right above
-    // the base.
-    static const int kFrameBaseSize = 4;
-
-    // A number of words that should be reserved on stack for the LiveEdit use.
-    // Normally equals 1. Stored on stack in form of Smi.
-    static const int kInitialSize;
-    // 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 kPaddingValue;
-  };
-
  private:
   explicit Debug(Isolate* isolate);
 
   MUST_USE_RESULT MaybeHandle<Object> MakeJSObject(
       Vector<const char> constructor_name,
       int argc,
       Handle<Object> argv[]);
   MUST_USE_RESULT MaybeHandle<Object> MakeExecutionState();
   MUST_USE_RESULT MaybeHandle<Object> MakeBreakEvent(
       Handle<Object> break_points_hit);
@@ skipping 89 matching lines @@
   bool disable_break_;
   bool break_on_exception_;
   bool break_on_uncaught_exception_;
 
   ScriptCache* script_cache_;  // Cache of all scripts in the heap.
   DebugInfoListNode* debug_info_list_;  // List of active debug info objects.
 
   // Per-thread data.
   class ThreadLocal {
    public:
+    // Top debugger entry.
+    EnterDebugger* debugger_entry_;
+
     // Counter for generating next break id.
     int break_count_;
 
     // Current break id.
     int break_id_;
 
     // Frame id for the frame of the current break.
     StackFrame::Id break_frame_id_;
 
     // Step action for last step performed.
@@ skipping 14 matching lines @@
     // Frame pointer for frame from which step in was performed.
     Address step_into_fp_;
 
     // Frame pointer for the frame where debugger should be called when current
     // step out action is completed.
     Address step_out_fp_;
 
     // Storage location for jump when exiting debug break calls.
     Address after_break_target_;
 
-    // Stores the way how LiveEdit has patched the stack. It is used when
-    // debugger returns control back to user script.
-    FrameDropMode frame_drop_mode_;
-
-    // Top debugger entry.
-    EnterDebugger* debugger_entry_;
-
     // Pending interrupts scheduled while debugging.
     bool has_pending_interrupt_;
 
+    // Stores the way how LiveEdit has patched the stack. It is used when
+    // debugger returns control back to user script.
+    LiveEdit::FrameDropMode frame_drop_mode_;
+
     // When restarter frame is on stack, stores the address
     // of the pointer to function being restarted. Otherwise (most of the time)
     // stores NULL. This pointer is used with 'step in' implementation.
     Object** restarter_frame_function_pointer_;
 
     // When a promise is being resolved, we may want to trigger a debug event
     // if we catch a throw.  For this purpose we remember the try-catch
     // handler address that would catch the exception.  We also hold onto a
     // closure that returns a promise if the exception is considered uncaught.
     // Due to the possibility of reentry we use a linked list.
     PromiseOnStack* promise_on_stack_;
   };
 
   // Storage location for registers when handling debug break calls
   ThreadLocal thread_local_;
 
   Isolate* isolate_;
 
   friend class Isolate;
   friend class EnterDebugger;
+  friend class FrameDropper;
 
   DISALLOW_COPY_AND_ASSIGN(Debug);
 };
 
 
 DECLARE_RUNTIME_FUNCTION(Debug_Break);
 
 
 // This class is used for entering the debugger. Create an instance in the stack
 // to enter the debugger. This will set the current break state, make sure the
@@ skipping 61 matching lines @@
   static void GenerateSlotDebugBreak(MacroAssembler* masm);
   static void GeneratePlainReturnLiveEdit(MacroAssembler* masm);
 
   // FrameDropper is a code replacement for a JavaScript frame with possibly
   // several frames above.
   // There is no calling conventions here, because it never actually gets
   // called, it only gets returned to.
   static void GenerateFrameDropperLiveEdit(MacroAssembler* masm);
 };
 
+
 } }  // namespace v8::internal
 
 #endif  // V8_DEBUG_H_