dByteArrayOop.hpp

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/* Copyright 1994, 1995 LongView Technologies L.L.C. $Revision: 1.9 $ */
/* Copyright (c) 2006, Sun Microsystems, Inc.
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// doubleByteArrays are arrays containing double bytes

// memory layout:
//    [header      ]
//    [klass_field ]
//    [instVars    ]*
//    [length      ]      offset

class doubleByteArrayOopDesc: public memOopDesc {
  public:
  // constructor
  friend doubleByteArrayOop as_doubleByteArrayOop(void* p) {
    return doubleByteArrayOop(as_memOop(p)); }

  void bootstrap_object(bootstrap* st);

  // accessors
  doubleByteArrayOopDesc* addr() const {
    return (doubleByteArrayOopDesc*) memOopDesc::addr(); }

  bool is_within_bounds(int index) const { return 1 <= index && index <= length(); }

  oop* addr_as_oops() const { return (oop*)addr(); }

  // returns the location of the length field
  oop* length_addr() const {
    return &addr_as_oops()[blueprint()->non_indexable_size()];
  }

  smi length() const {
    oop len = *length_addr();
    assert(len->is_smi(), "length of indexable should be smi");
    return smiOop(len)->value();}

  void set_length(smi len) {
    *length_addr() = (oop) as_smiOop(len); }
 
  // returns the location where the double bytes start
  doubleByte* doubleBytes() const {
    return (doubleByte*) &length_addr()[1];  
  }

  doubleByte* doubleByte_at_addr(int which) const {
    assert(which > 0 && which <= length(), "index out of bounds");
    return &doubleBytes()[which - 1];
  }

  doubleByte doubleByte_at(int which) const {
    return *doubleByte_at_addr(which); }

  void doubleByte_at_put(int which, doubleByte contents) {
    *doubleByte_at_addr(which) = contents; }

  // three way compare
  int compare(doubleByteArrayOop arg);

  // Returns the hash value for the string
  int hash_value();

  // copy string to buffer as null terminated ascii string. 
  bool copy_null_terminated(char* buffer, int max_length);
  char* as_string();

  // memory operations
  bool verify();

  friend doubleByteArrayKlass;
};

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