objArrayOop.hpp

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/* Copyright 1994, 1995 LongView Technologies L.L.C. $Revision: 1.18 $ */
/* Copyright (c) 2006, Sun Microsystems, Inc.
All rights reserved.

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// objArrays are arrays containing oops

// memory layout:
//    [header      ]
//    [klass_field ]
//    [instVars    ]*
//    [length      ]
//    [elements    ]* = objs(1) .. objs(length)

class objArrayOopDesc: public memOopDesc {
 public:
  // constructor
  friend objArrayOop as_objArrayOop(void* p) {
    return objArrayOop(as_memOop(p)); }

  void bootstrap_object(bootstrap* st);

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

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

  oop* addr_as_oops() const { return (oop*) addr(); }
 
  oop* objs(int which) const {
    return &length_addr()[which];
  }

  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() = as_smiOop(len);
  }
  
  oop obj_at(int which) const {
    assert(which > 0 && which <= length(), "index out of bounds");
    return *objs(which);
  }

  void obj_at_put(int which, oop contents, bool cs = true) {
    assert(which > 0 && which <= length(), "index out of bounds");
    assert(!is_symbol(), "shouldn't be modifying a canonical string");
    assert(contents->verify(), "check contents");
    if (cs) {
      STORE_OOP(objs(which), contents);
    } else {
      *objs(which) = contents;
    }
  }

  objArrayOop growBy(int increment);
  
  // memory operations
  bool verify();

  objArrayOop copy_remove(int from, int number = 1);

  objArrayOop copy();
  objArrayOop copy_add(oop a);
  objArrayOop copy_add_two(oop a, oop b);

  // primtiive operations
  void replace_from_to(int from, int to, objArrayOop source, int start);
  void replace_and_fill(int from, int start, objArrayOop source);

  friend objArrayKlass;
 private:
  // define the interval [begin .. end[ where the indexables are.
  oop* begin_indexables() const { return objs(1); }
  oop* end_indexables()   const { return begin_indexables() + length(); }
};


class weakArrayOopDesc: public objArrayOopDesc {
 public:
  friend weakArrayOop as_weakArrayOop(void* p) {
    return weakArrayOop(as_memOop(p)); }

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

  void scavenge_contents_after_registration();
  void follow_contents_after_registration();
};

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