jdk8-mips64-public/hotspot: src/share/vm/utilities/growableArray.hpp@0e35fa8ebccd (annotated)

src/share/vm/utilities/growableArray.hpp@0e35fa8ebccd (annotated)

src/share/vm/utilities/growableArray.hpp

Tue, 03 Aug 2010 15:55:03 -0700

author: kvn
date: Tue, 03 Aug 2010 15:55:03 -0700
changeset 2040: 0e35fa8ebccd
parent 1907: c18cbe5936b8
child 2314: f95d63e2154a
permissions: -rw-r--r--

6973963: SEGV in ciBlock::start_bci() with EA
Summary: Added more checks into ResourceObj and growableArray to verify correctness of allocation type.
Reviewed-by: never, coleenp, dholmes

 /*
  * Copyright (c) 1997, 2008, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 // A growable array.
 /*************************************************************************/
 /*                                                                       */
 /*     WARNING WARNING WARNING WARNING WARNING WARNING WARNING WARNING   */
 /*                                                                       */
 /* Should you use GrowableArrays to contain handles you must be certain  */
 /* the the GrowableArray does not outlive the HandleMark that contains   */
 /* the handles. Since GrowableArrays are typically resource allocated    */
 /* the following is an example of INCORRECT CODE,                        */
 /*                                                                       */
 /* ResourceMark rm;                                                      */
 /* GrowableArray<Handle>* arr = new GrowableArray<Handle>(size);         */
 /* if (blah) {                                                           */
 /*    while (...) {                                                      */
 /*      HandleMark hm;                                                   */
 /*      ...                                                              */
 /*      Handle h(THREAD, some_oop);                                      */
 /*      arr->append(h);                                                  */
 /*    }                                                                  */
 /* }                                                                     */
 /* if (arr->length() != 0 ) {                                            */
 /*    oop bad_oop = arr->at(0)(); // Handle is BAD HERE.                 */
 /*    ...                                                                */
 /* }                                                                     */
 /*                                                                       */
 /* If the GrowableArrays you are creating is C_Heap allocated then it    */
 /* hould not old handles since the handles could trivially try and       */
 /* outlive their HandleMark. In some situations you might need to do     */
 /* this and it would be legal but be very careful and see if you can do  */
 /* the code in some other manner.                                        */
 /*                                                                       */
 /*************************************************************************/
 // To call default constructor the placement operator new() is used.
 // It should be empty (it only returns the passed void* pointer).
 // The definition of placement operator new(size_t, void*) in the <new>.
 #include <new>
 // Need the correct linkage to call qsort without warnings
 extern "C" {
   typedef int (*_sort_Fn)(const void *, const void *);
 }
 class GenericGrowableArray : public ResourceObj {
  protected:
   int    _len;          // current length
   int    _max;          // maximum length
   Arena* _arena;        // Indicates where allocation occurs:
                         //   0 means default ResourceArea
                         //   1 means on C heap
                         //   otherwise, allocate in _arena
 #ifdef ASSERT
   int    _nesting;      // resource area nesting at creation
   void   set_nesting();
   void   check_nesting();
 #else
 #define  set_nesting();
 #define  check_nesting();
 #endif
   // Where are we going to allocate memory?
   bool on_C_heap() { return _arena == (Arena*)1; }
   bool on_stack () { return _arena == NULL;      }
   bool on_arena () { return _arena >  (Arena*)1;  }
   // This GA will use the resource stack for storage if c_heap==false,
   // Else it will use the C heap.  Use clear_and_deallocate to avoid leaks.
   GenericGrowableArray(int initial_size, int initial_len, bool c_heap) {
     _len = initial_len;
     _max = initial_size;
     assert(_len >= 0 && _len <= _max, "initial_len too big");
     _arena = (c_heap ? (Arena*)1 : NULL);
     set_nesting();
     assert(!on_C_heap() || allocated_on_C_heap(), "growable array must be on C heap if elements are");
     assert(!on_stack() ||
            (allocated_on_res_area() || allocated_on_stack()),
            "growable array must be on stack if elements are not on arena and not on C heap");
   }
   // This GA will use the given arena for storage.
   // Consider using new(arena) GrowableArray<T> to allocate the header.
   GenericGrowableArray(Arena* arena, int initial_size, int initial_len) {
     _len = initial_len;
     _max = initial_size;
     assert(_len >= 0 && _len <= _max, "initial_len too big");
     _arena = arena;
     assert(on_arena(), "arena has taken on reserved value 0 or 1");
     // Relax next assert to allow object allocation on resource area,
     // on stack or embedded into an other object.
     assert(allocated_on_arena() || allocated_on_stack(),
            "growable array must be on arena or on stack if elements are on arena");
   }
   void* raw_allocate(int elementSize);
   // some uses pass the Thread explicitly for speed (4990299 tuning)
   void* raw_allocate(Thread* thread, int elementSize) {
     assert(on_stack(), "fast ResourceObj path only");
     return (void*)resource_allocate_bytes(thread, elementSize * _max);
   }
 };
 template<class E> class GrowableArray : public GenericGrowableArray {
  private:
   E*     _data;         // data array
   void grow(int j);
   void raw_at_put_grow(int i, const E& p, const E& fill);
   void  clear_and_deallocate();
  public:
   GrowableArray(Thread* thread, int initial_size) : GenericGrowableArray(initial_size, 0, false) {
     _data = (E*)raw_allocate(thread, sizeof(E));
     for (int i = 0; i < _max; i++) ::new ((void*)&_data[i]) E();
   }
   GrowableArray(int initial_size, bool C_heap = false) : GenericGrowableArray(initial_size, 0, C_heap) {
     _data = (E*)raw_allocate(sizeof(E));
     for (int i = 0; i < _max; i++) ::new ((void*)&_data[i]) E();
   }
   GrowableArray(int initial_size, int initial_len, const E& filler, bool C_heap = false) : GenericGrowableArray(initial_size, initial_len, C_heap) {
     _data = (E*)raw_allocate(sizeof(E));
     int i = 0;
     for (; i < _len; i++) ::new ((void*)&_data[i]) E(filler);
     for (; i < _max; i++) ::new ((void*)&_data[i]) E();
   }
   GrowableArray(Arena* arena, int initial_size, int initial_len, const E& filler) : GenericGrowableArray(arena, initial_size, initial_len) {
     _data = (E*)raw_allocate(sizeof(E));
     int i = 0;
     for (; i < _len; i++) ::new ((void*)&_data[i]) E(filler);
     for (; i < _max; i++) ::new ((void*)&_data[i]) E();
   }
   GrowableArray() : GenericGrowableArray(2, 0, false) {
     _data = (E*)raw_allocate(sizeof(E));
     ::new ((void*)&_data[0]) E();
     ::new ((void*)&_data[1]) E();
   }
                                 // Does nothing for resource and arena objects
   ~GrowableArray()              { if (on_C_heap()) clear_and_deallocate(); }
   void  clear()                 { _len = 0; }
   int   length() const          { return _len; }
   void  trunc_to(int l)         { assert(l <= _len,"cannot increase length"); _len = l; }
   bool  is_empty() const        { return _len == 0; }
   bool  is_nonempty() const     { return _len != 0; }
   bool  is_full() const         { return _len == _max; }
   DEBUG_ONLY(E* data_addr() const      { return _data; })
   void print();
   int append(const E& elem) {
     check_nesting();
     if (_len == _max) grow(_len);
     int idx = _len++;
     _data[idx] = elem;
     return idx;
   }
   void append_if_missing(const E& elem) {
     if (!contains(elem)) append(elem);
   }
   E at(int i) const {
     assert(0 <= i && i < _len, "illegal index");
     return _data[i];
   }
   E* adr_at(int i) const {
     assert(0 <= i && i < _len, "illegal index");
     return &_data[i];
   }
   E first() const {
     assert(_len > 0, "empty list");
     return _data[0];
   }
   E top() const {
     assert(_len > 0, "empty list");
     return _data[_len-1];
   }
   void push(const E& elem) { append(elem); }
   E pop() {
     assert(_len > 0, "empty list");
     return _data[--_len];
   }
   void at_put(int i, const E& elem) {
     assert(0 <= i && i < _len, "illegal index");
     _data[i] = elem;
   }
   E at_grow(int i, const E& fill = E()) {
     assert(0 <= i, "negative index");
     check_nesting();
     if (i >= _len) {
       if (i >= _max) grow(i);
       for (int j = _len; j <= i; j++)
         _data[j] = fill;
       _len = i+1;
     }
     return _data[i];
   }
   void at_put_grow(int i, const E& elem, const E& fill = E()) {
     assert(0 <= i, "negative index");
     check_nesting();
     raw_at_put_grow(i, elem, fill);
   }
   bool contains(const E& elem) const {
     for (int i = 0; i < _len; i++) {
       if (_data[i] == elem) return true;
     }
     return false;
   }
   int  find(const E& elem) const {
     for (int i = 0; i < _len; i++) {
       if (_data[i] == elem) return i;
     }
     return -1;
   }
   int  find(void* token, bool f(void*, E)) const {
     for (int i = 0; i < _len; i++) {
       if (f(token, _data[i])) return i;
     }
     return -1;
   }
   int  find_at_end(void* token, bool f(void*, E)) const {
     // start at the end of the array
     for (int i = _len-1; i >= 0; i--) {
       if (f(token, _data[i])) return i;
     }
     return -1;
   }
   void remove(const E& elem) {
     for (int i = 0; i < _len; i++) {
       if (_data[i] == elem) {
         for (int j = i + 1; j < _len; j++) _data[j-1] = _data[j];
         _len--;
         return;
       }
     }
     ShouldNotReachHere();
   }
   void remove_at(int index) {
     assert(0 <= index && index < _len, "illegal index");
     for (int j = index + 1; j < _len; j++) _data[j-1] = _data[j];
     _len--;
   }
   // inserts the given element before the element at index i
   void insert_before(const int idx, const E& elem) {
     check_nesting();
     if (_len == _max) grow(_len);
     for (int j = _len - 1; j >= idx; j--) {
       _data[j + 1] = _data[j];
     }
     _len++;
     _data[idx] = elem;
   }
   void appendAll(const GrowableArray<E>* l) {
     for (int i = 0; i < l->_len; i++) {
       raw_at_put_grow(_len, l->_data[i], 0);
     }
   }
   void sort(int f(E*,E*)) {
     qsort(_data, length(), sizeof(E), (_sort_Fn)f);
   }
   // sort by fixed-stride sub arrays:
   void sort(int f(E*,E*), int stride) {
     qsort(_data, length() / stride, sizeof(E) * stride, (_sort_Fn)f);
   }
 };
 // Global GrowableArray methods (one instance in the library per each 'E' type).
 template<class E> void GrowableArray<E>::grow(int j) {
     // grow the array by doubling its size (amortized growth)
     int old_max = _max;
     if (_max == 0) _max = 1; // prevent endless loop
     while (j >= _max) _max = _max*2;
     // j < _max
     E* newData = (E*)raw_allocate(sizeof(E));
     int i = 0;
     for (     ; i < _len; i++) ::new ((void*)&newData[i]) E(_data[i]);
     for (     ; i < _max; i++) ::new ((void*)&newData[i]) E();
     for (i = 0; i < old_max; i++) _data[i].~E();
     if (on_C_heap() && _data != NULL) {
       FreeHeap(_data);
     }
     _data = newData;
 }
 template<class E> void GrowableArray<E>::raw_at_put_grow(int i, const E& p, const E& fill) {
     if (i >= _len) {
       if (i >= _max) grow(i);
       for (int j = _len; j < i; j++)
         _data[j] = fill;
       _len = i+1;
     }
     _data[i] = p;
 }
 // This function clears and deallocate the data in the growable array that
 // has been allocated on the C heap.  It's not public - called by the
 // destructor.
 template<class E> void GrowableArray<E>::clear_and_deallocate() {
     assert(on_C_heap(),
            "clear_and_deallocate should only be called when on C heap");
     clear();
     if (_data != NULL) {
       for (int i = 0; i < _max; i++) _data[i].~E();
       FreeHeap(_data);
       _data = NULL;
     }
 }
 template<class E> void GrowableArray<E>::print() {
     tty->print("Growable Array " INTPTR_FORMAT, this);
     tty->print(": length %ld (_max %ld) { ", _len, _max);
     for (int i = 0; i < _len; i++) tty->print(INTPTR_FORMAT " ", *(intptr_t*)&(_data[i]));
     tty->print("}\n");
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/utilities/growableArray.hpp@0e35fa8ebccd (annotated)

src/share/vm/utilities/growableArray.hpp