dispatchTable.hpp

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/* Copyright 1994 - 1996, LongView Technologies L.L.C. $Revision: 1.11 $ */
/* Copyright (c) 2006, Sun Microsystems, Inc.
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// The dispatchTable controls the dispatch of byte codes

class dispatchTable: AllStatic {
 private:
  enum Mode {
    normal_mode = 0,
    step_mode   = 1,
    next_mode   = 2,
    return_mode = 3
  };

  static Mode mode;
  static void patch_with_sst_stub();

 public:
  // the dispatch table
  static u_char** table();

  // initializes the dispatch table to the original state.
  static void reset();

  // intercepts all relevant entries to enable single step.
  static void intercept_for_step();
  static void intercept_for_next(int* fr);
  static void intercept_for_return(int* fr);

  // answers whether the dispatch table is in single step mode.
  static bool in_normal_mode()  { return mode == normal_mode; }
  static bool in_step_mode()    { return mode == step_mode; }
  static bool in_next_mode()    { return mode == next_mode; }
  static bool in_return_mode()  { return mode == return_mode; }
};

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