dValueArrayOop.hpp

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/* Copyright 1996 LongView Technologies L.L.C. $Revision: 1.1 $ */
/* Copyright (c) 2006, Sun Microsystems, Inc.
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// doubleValueArrays are arrays containing double value [8 bytes each]

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

class doubleValueArrayOopDesc: public memOopDesc {
  public:
  // constructor
  friend doubleValueArrayOop as_doubleValueArrayOop(void* p) {
    return doubleValueArrayOop(as_memOop(p)); }

  void bootstrap_object(bootstrap* st);

  // accessors
  doubleValueArrayOopDesc* addr() const {
    return (doubleValueArrayOopDesc*) 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
  double* double_start() const {
    return (double*) &length_addr()[1];  
  }

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

  double double_at(int which) const {
    return *double_at_addr(which); }

  void double_at_put(int which, double value) {
    *double_at_addr(which) = value; }

  // memory operations
  bool verify();

  friend doubleValueArrayKlass;
};

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