Remove the redundant flags is_bound_ and is_linked_ from the...

src/jump-target.h

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 72 matching lines @@
   CodeGenerator* code_generator() const { return cgen_; }
 
   Label* entry_label() { return &entry_label_; }
 
   VirtualFrame* entry_frame() const { return entry_frame_; }
   void set_entry_frame(VirtualFrame* frame) {
     entry_frame_ = frame;
   }
 
   // Predicates testing the state of the encapsulated label.
-  bool is_bound() const { return is_bound_; }
-  bool is_linked() const { return is_linked_; }
-  bool is_unused() const { return !is_bound() && !is_linked(); }
+  bool is_bound() const { return entry_label_.is_bound(); }
+  bool is_linked() const {
+    return !is_bound() && !reaching_frames_.is_empty();
+  }
+  bool is_unused() const {
+    // This is !is_bound() && !is_linked().
+    return !is_bound() && reaching_frames_.is_empty();
+  }
 
   // Emit a jump to the target.  There must be a current frame at the
   // jump and there will be no current frame after the jump.
   virtual void Jump();
   virtual void Jump(Result* arg);
   void Jump(Result* arg0, Result* arg1);
   void Jump(Result* arg0, Result* arg1, Result* arg2);
 
   // Emit a conditional branch to the target.  There must be a current
   // frame at the branch.  The current frame will fall through to the
@@ skipping 54 matching lines @@
  protected:
   // The code generator gives access to its current frame.
   CodeGenerator* cgen_;
 
   // Used to emit code.
   MacroAssembler* masm_;
 
   // Directionality flag set at initialization time.
   Directionality direction_;
 
-  // A target is bound if its Bind member function has been called.
-  // It is linked if it is not bound but its Jump, Branch, or Call
-  // member functions have been called.
-  bool is_bound_;
-  bool is_linked_;
-
   // A list of frames reaching this block via forward jumps.
   ZoneList<VirtualFrame*> reaching_frames_;
 
   // A parallel list of labels for merge code.
   ZoneList<Label> merge_labels_;
 
   // The frame used on entry to the block and expected at backward
   // jumps to the block.  Set when the jump target is bound, but may
   // or may not be set for forward-only blocks.
   VirtualFrame* entry_frame_;
@@ skipping 129 matching lines @@
   bool is_shadowing_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(ShadowTarget);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_JUMP_TARGET_H_