pcDesc.hpp

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/* Copyright 1994 - 1996, LongView Technologies L.L.C. $Revision: 1.8 $ */
/* Copyright (c) 2006, Sun Microsystems, Inc.
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#ifdef DELTA_COMPILER

// PcDescs map a physical PC (given as offset from start of nmethod) to
// the corresponding source scope and byte code index.

class PcDesc : public ValueObj {
 public:
  int    pc;            // offset from start of method (could be uint16)
  uint16 scope;         // scope index 
  int16  byteCode;      // can be negative (PrologueBCI et al)

  // Constructor (only used for static in nmethod.cpp)
  PcDesc(int pc, uint16 scope, uint16 byteCode);

  // Returns the scope matching this pc desc
  ScopeDesc* containingDesc(const nmethod* nm) const;

  // Returns the real pc
  char* real_pc(const nmethod* nm) const;

  bool equals(const PcDesc* other) const {
    return pc       == other->pc
        && scope    == other->scope
        && byteCode == other->byteCode;
  }

  bool source_equals(const PcDesc* other) const {
    return scope    == other->scope
        && byteCode == other->byteCode;
  }


  bool is_prologue() const { return byteCode == PrologueBCI; }
  bool is_epilogue() const { return byteCode == EpilogueBCI; }

  void print(nmethod* nm);
  bool verify(nmethod* nm);
};

#endif

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