hotspot/src/share/vm/utilities/array.hpp
author stefank
Fri, 14 Nov 2014 09:47:09 +0100
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8064811: Use THREAD instead of CHECK_NULL in return statements Reviewed-by: coleenp, simonis, dholmes
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/*
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 * Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_UTILITIES_ARRAY_HPP
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#define SHARE_VM_UTILITIES_ARRAY_HPP
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#include "memory/allocation.hpp"
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#include "memory/allocation.inline.hpp"
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#include "memory/metaspace.hpp"
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#include "runtime/orderAccess.hpp"
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// correct linkage required to compile w/o warnings
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// (must be on file level - cannot be local)
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extern "C" { typedef int (*ftype)(const void*, const void*); }
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class ResourceArray: public ResourceObj {
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 protected:
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  int   _length;                                 // the number of array elements
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  void* _data;                                   // the array memory
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#ifdef ASSERT
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  int   _nesting;                                // the resource area nesting level
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#endif
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  // creation
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  ResourceArray() {
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    _length  = 0;
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    _data    = NULL;
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    DEBUG_ONLY(init_nesting();)
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    // client may call initialize, at most once
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  }
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  ResourceArray(size_t esize, int length) {
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    DEBUG_ONLY(_data = NULL);
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    initialize(esize, length);
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  }
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  void initialize(size_t esize, int length) {
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    assert(length >= 0, "illegal length");
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    assert(StressRewriter || _data == NULL, "must be new object");
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    _length  = length;
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    _data    = resource_allocate_bytes(esize * length);
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    DEBUG_ONLY(init_nesting();)
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  }
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#ifdef ASSERT
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  void init_nesting();
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#endif
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  // helper functions
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  void sort     (size_t esize, ftype f);         // sort the array
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  void expand   (size_t esize, int i, int& size);// expand the array to include slot i
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  void remove_at(size_t esize, int i);           // remove the element in slot i
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 public:
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  // standard operations
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  int  length() const                            { return _length; }
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  bool is_empty() const                          { return length() == 0; }
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};
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template <MEMFLAGS F>class CHeapArray: public CHeapObj<F> {
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  int   _length;                                 // the number of array elements
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  void* _data;                                   // the array memory
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  // creation
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  CHeapArray() {
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    _length  = 0;
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    _data    = NULL;
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  }
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  CHeapArray(size_t esize, int length) {
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    assert(length >= 0, "illegal length");
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    _length  = length;
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    _data    = (void*) NEW_C_HEAP_ARRAY(char *, esize * length, F);
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  }
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  void initialize(size_t esize, int length) {
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    // In debug set array to 0?
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  }
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#ifdef ASSERT
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  void init_nesting();
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#endif
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  // helper functions
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  void sort     (size_t esize, ftype f);         // sort the array
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  void expand   (size_t esize, int i, int& size);// expand the array to include slot i
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  void remove_at(size_t esize, int i);           // remove the element in slot i
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 public:
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  // standard operations
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  int  length() const                            { return _length; }
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  bool is_empty() const                          { return length() == 0; }
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};
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#define define_generic_array(array_name,element_type, base_class)                        \
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  class array_name: public base_class {                                                  \
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   protected:                                                                            \
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    typedef element_type etype;                                                          \
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    enum { esize = sizeof(etype) };                                                      \
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                                                                                         \
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    void base_remove_at(size_t size, int i) { base_class::remove_at(size, i); }          \
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                                                                                         \
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   public:                                                                               \
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    /* creation */                                                                       \
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    array_name() : base_class()                       {}                                 \
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    explicit array_name(const int length) : base_class(esize, length) {}                          \
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    array_name(const int length, const etype fx)      { initialize(length, fx); }        \
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    void initialize(const int length)     { base_class::initialize(esize, length); }     \
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    void initialize(const int length, const etype fx) {                                  \
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      initialize(length);                                                                \
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      for (int i = 0; i < length; i++) ((etype*)_data)[i] = fx;                          \
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    }                                                                                    \
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                                                                                         \
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    /* standard operations */                                                            \
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    etype& operator [] (const int i) const {                                             \
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      assert(0 <= i && i < length(), "index out of bounds");                             \
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      return ((etype*)_data)[i];                                                         \
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    }                                                                                    \
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                                                                                         \
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    int index_of(const etype x) const {                                                  \
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      int i = length();                                                                  \
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      while (i-- > 0 && ((etype*)_data)[i] != x) ;                                       \
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      /* i < 0 || ((etype*)_data)_data[i] == x */                                        \
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      return i;                                                                          \
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    }                                                                                    \
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                                                                                         \
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    void sort(int f(etype*, etype*))             { base_class::sort(esize, (ftype)f); }  \
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    bool contains(const etype x) const           { return index_of(x) >= 0; }            \
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                                                                                         \
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    /* deprecated operations - for compatibility with GrowableArray only */              \
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    etype  at(const int i) const                 { return (*this)[i]; }                  \
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    void   at_put(const int i, const etype x)    { (*this)[i] = x; }                     \
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    etype* adr_at(const int i)                   { return &(*this)[i]; }                 \
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    int    find(const etype x)                   { return index_of(x); }                 \
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  };                                                                                     \
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#define define_array(array_name,element_type)                                            \
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  define_generic_array(array_name, element_type, ResourceArray)
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#define define_stack(stack_name,array_name)                                              \
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  class stack_name: public array_name {                                                  \
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   protected:                                                                            \
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    int _size;                                                                           \
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                                                                                         \
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    void grow(const int i, const etype fx) {                                             \
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      assert(i >= length(), "index too small");                                          \
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      if (i >= size()) expand(esize, i, _size);                                          \
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      for (int j = length(); j <= i; j++) ((etype*)_data)[j] = fx;                       \
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      _length = i+1;                                                                     \
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    }                                                                                    \
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                                                                                         \
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   public:                                                                               \
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    /* creation */                                                                       \
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    stack_name() : array_name()                     { _size = 0; }                       \
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    stack_name(const int size)                      { initialize(size); }                \
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    stack_name(const int size, const etype fx)      { initialize(size, fx); }            \
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    void initialize(const int size, const etype fx) {                                    \
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      _size = size;                                                                      \
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      array_name::initialize(size, fx);                                                  \
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      /* _length == size, allocation and size are the same */                            \
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    }                                                                                    \
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    void initialize(const int size) {                                                    \
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      _size = size;                                                                      \
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      array_name::initialize(size);                                                      \
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      _length = 0;          /* reset length to zero; _size records the allocation */     \
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    }                                                                                    \
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                                                                                         \
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    /* standard operations */                                                            \
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    int size() const                             { return _size; }                       \
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                                                                                         \
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    int push(const etype x) {                                                            \
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      int len = length();                                                                \
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      if (len >= size()) expand(esize, len, _size);                                      \
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      ((etype*)_data)[len] = x;                                                          \
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      _length = len+1;                                                                   \
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      return len;                                                                        \
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    }                                                                                    \
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                                                                                         \
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    etype pop() {                                                                        \
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      assert(!is_empty(), "stack is empty");                                             \
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      return ((etype*)_data)[--_length];                                                 \
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    }                                                                                    \
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                                                                                         \
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    etype top() const {                                                                  \
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      assert(!is_empty(), "stack is empty");                                             \
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      return ((etype*)_data)[length() - 1];                                              \
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    }                                                                                    \
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                                                                                         \
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    void push_all(const stack_name* stack) {                                             \
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      const int l = stack->length();                                                     \
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      for (int i = 0; i < l; i++) push(((etype*)(stack->_data))[i]);                     \
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    }                                                                                    \
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                                                                                         \
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    etype at_grow(const int i, const etype fx) {                                         \
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      if (i >= length()) grow(i, fx);                                                    \
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      return ((etype*)_data)[i];                                                         \
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    }                                                                                    \
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                                                                                         \
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    void at_put_grow(const int i, const etype x, const etype fx) {                       \
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      if (i >= length()) grow(i, fx);                                                    \
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      ((etype*)_data)[i] = x;                                                            \
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    }                                                                                    \
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                                                                                         \
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    void truncate(const int length) {                                                    \
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      assert(0 <= length && length <= this->length(), "illegal length");                 \
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      _length = length;                                                                  \
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    }                                                                                    \
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                                                                                         \
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    void remove_at(int i)                        { base_remove_at(esize, i); }           \
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    void remove(etype x)                         { remove_at(index_of(x)); }             \
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                                                                                         \
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    /* inserts the given element before the element at index i */                        \
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    void insert_before(const int i, const etype el)  {                                   \
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      int len = length();                                                                \
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      int new_length = len + 1;                                                          \
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      if (new_length >= size()) expand(esize, new_length, _size);                        \
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      for (int j = len - 1; j >= i; j--) {                                               \
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        ((etype*)_data)[j + 1] = ((etype*)_data)[j];                                     \
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      }                                                                                  \
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      _length = new_length;                                                              \
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      at_put(i, el);                                                                     \
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    }                                                                                    \
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                                                                                         \
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    /* inserts contents of the given stack before the element at index i */              \
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    void insert_before(const int i, const stack_name *st) {                              \
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      if (st->length() == 0) return;                                                     \
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      int len = length();                                                                \
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      int st_len = st->length();                                                         \
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      int new_length = len + st_len;                                                     \
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      if (new_length >= size()) expand(esize, new_length, _size);                        \
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      int j;                                                                             \
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      for (j = len - 1; j >= i; j--) {                                                   \
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        ((etype*)_data)[j + st_len] = ((etype*)_data)[j];                                \
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      }                                                                                  \
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      for (j = 0; j < st_len; j++) {                                                     \
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        ((etype*)_data)[i + j] = ((etype*)st->_data)[j];                                 \
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      }                                                                                  \
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      _length = new_length;                                                              \
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    }                                                                                    \
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                                                                                         \
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    /* deprecated operations - for compatibility with GrowableArray only */              \
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    int  capacity() const                        { return size(); }                      \
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    void clear()                                 { truncate(0); }                        \
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    void trunc_to(const int length)              { truncate(length); }                   \
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    int  append(const etype x)                   { return push(x); }                     \
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    void appendAll(const stack_name* stack)      { push_all(stack); }                    \
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    etype last() const                           { return top(); }                       \
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  };                                                                                     \
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#define define_resource_list(element_type)                                               \
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  define_generic_array(element_type##Array, element_type, ResourceArray)                 \
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  define_stack(element_type##List, element_type##Array)
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#define define_resource_pointer_list(element_type)                                       \
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  define_generic_array(element_type##Array, element_type *, ResourceArray)               \
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  define_stack(element_type##List, element_type##Array)
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#define define_c_heap_list(element_type)                                                 \
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  define_generic_array(element_type##Array, element_type, CHeapArray)                    \
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  define_stack(element_type##List, element_type##Array)
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#define define_c_heap_pointer_list(element_type)                                         \
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  define_generic_array(element_type##Array, element_type *, CHeapArray)                  \
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  define_stack(element_type##List, element_type##Array)
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// Arrays for basic types
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define_array(boolArray, bool)          define_stack(boolStack, boolArray)
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define_array(intArray , int )          define_stack(intStack , intArray )
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// Array for metadata allocation
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template <typename T>
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class Array: public MetaspaceObj {
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  friend class MetadataFactory;
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  friend class VMStructs;
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  friend class MethodHandleCompiler;           // special case
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  friend class WhiteBox;
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protected:
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  int _length;                                 // the number of array elements
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  T   _data[1];                                // the array memory
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  void initialize(int length) {
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    _length = length;
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  }
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 private:
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  // Turn off copy constructor and assignment operator.
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  Array(const Array<T>&);
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  void operator=(const Array<T>&);
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  void* operator new(size_t size, ClassLoaderData* loader_data, int length, bool read_only, TRAPS) throw() {
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    size_t word_size = Array::size(length);
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    return (void*) Metaspace::allocate(loader_data, word_size, read_only,
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                                       MetaspaceObj::array_type(sizeof(T)), THREAD);
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  }
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  static size_t byte_sizeof(int length) { return sizeof(Array<T>) + MAX2(length - 1, 0) * sizeof(T); }
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  // WhiteBox API helper.
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  // Can't distinguish between array of length 0 and length 1,
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  // will always return 0 in those cases.
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  static int bytes_to_length(size_t bytes)       {
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    assert(is_size_aligned(bytes, BytesPerWord), "Must be, for now");
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    if (sizeof(Array<T>) >= bytes) {
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      return 0;
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    }
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    size_t left = bytes - sizeof(Array<T>);
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    assert(is_size_aligned(left, sizeof(T)), "Must be");
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    size_t elements = left / sizeof(T);
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    assert(elements <= (size_t)INT_MAX, err_msg("number of elements " SIZE_FORMAT "doesn't fit into an int.", elements));
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    int length = (int)elements;
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    assert((size_t)size(length) * BytesPerWord == bytes,
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        err_msg("Expected: " SIZE_FORMAT " got: " SIZE_FORMAT,
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                bytes, (size_t)size(length) * BytesPerWord));
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    return length;
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  }
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  explicit Array(int length) : _length(length) {
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    assert(length >= 0, "illegal length");
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  }
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  Array(int length, T init) : _length(length) {
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    assert(length >= 0, "illegal length");
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    for (int i = 0; i < length; i++) {
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      _data[i] = init;
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    }
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  }
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   365
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 public:
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   367
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  // standard operations
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  int  length() const                 { return _length; }
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  T* data()                           { return _data; }
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  bool is_empty() const               { return length() == 0; }
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   372
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  int index_of(const T& x) const {
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    int i = length();
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    while (i-- > 0 && _data[i] != x) ;
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    return i;
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  }
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   379
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  // sort the array.
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  bool contains(const T& x) const      { return index_of(x) >= 0; }
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  T    at(int i) const                 { assert(i >= 0 && i< _length, err_msg("oob: 0 <= %d < %d", i, _length)); return _data[i]; }
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  void at_put(const int i, const T& x) { assert(i >= 0 && i< _length, err_msg("oob: 0 <= %d < %d", i, _length)); _data[i] = x; }
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  T*   adr_at(const int i)             { assert(i >= 0 && i< _length, err_msg("oob: 0 <= %d < %d", i, _length)); return &_data[i]; }
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  int  find(const T& x)                { return index_of(x); }
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   387
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  T at_acquire(const int which)              { return OrderAccess::load_acquire(adr_at(which)); }
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  void release_at_put(int which, T contents) { OrderAccess::release_store(adr_at(which), contents); }
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   390
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  static int size(int length) {
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    return align_size_up(byte_sizeof(length), BytesPerWord) / BytesPerWord;
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  }
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   394
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  int size() {
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    return size(_length);
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  }
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   398
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   399
  static int length_offset_in_bytes() { return (int) (offset_of(Array<T>, _length)); }
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  // Note, this offset don't have to be wordSize aligned.
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  static int base_offset_in_bytes() { return (int) (offset_of(Array<T>, _data)); };
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   402
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  // FIXME: How to handle this?
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  void print_value_on(outputStream* st) const {
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   405
    st->print("Array<T>(" INTPTR_FORMAT ")", p2i(this));
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  }
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   407
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   408
#ifndef PRODUCT
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   409
  void print(outputStream* st) {
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     for (int i = 0; i< _length; i++) {
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   411
       st->print_cr("%d: " INTPTR_FORMAT, i, (intptr_t)at(i));
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     }
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   413
  }
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   414
  void print() { print(tty); }
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#endif // PRODUCT
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};
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   418
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#endif // SHARE_VM_UTILITIES_ARRAY_HPP