jdk8-mips64-public/hotspot: src/share/vm/adlc/arena.hpp@f90c822e73f8 (annotated)

src/share/vm/adlc/arena.hpp@f90c822e73f8 (annotated)

src/share/vm/adlc/arena.hpp

Wed, 27 Apr 2016 01:25:04 +0800

author: aoqi
date: Wed, 27 Apr 2016 01:25:04 +0800
changeset 0: f90c822e73f8
child 6876: 710a3c8b516e
permissions: -rw-r--r--

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http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

 /*
  * Copyright (c) 1998, 2013, 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.
  *
  */
 #ifndef SHARE_VM_ADLC_ARENA_HPP
 #define SHARE_VM_ADLC_ARENA_HPP
 // All classes in the virtual machine must be subclassed
 // by one of the following allocation classes:
 //
 //
 // For objects allocated in the C-heap (managed by: free & malloc).
 // - CHeapObj
 //
 //
 // For embedded objects.
 // - ValueObj
 //
 // For classes used as name spaces.
 // - AllStatic
 //
 class CHeapObj {
  public:
   void* operator new(size_t size) throw();
   void  operator delete(void* p);
   void* new_array(size_t size);
 };
 // Base class for objects used as value objects.
 // Calling new or delete will result in fatal error.
 class ValueObj {
  public:
   void* operator new(size_t size) throw();
   void operator delete(void* p);
 };
 // Base class for classes that constitute name spaces.
 class AllStatic {
  public:
   void* operator new(size_t size) throw();
   void operator delete(void* p);
 };
 //------------------------------Chunk------------------------------------------
 // Linked list of raw memory chunks
 class Chunk: public CHeapObj {
  public:
   void* operator new(size_t size, size_t length) throw();
   void  operator delete(void* p, size_t length);
   Chunk(size_t length);
   enum {
       init_size =  1*1024,      // Size of first chunk
       size      = 32*1024       // Default size of an Arena chunk (following the first)
   };
   Chunk*       _next;           // Next Chunk in list
   size_t       _len;            // Size of this Chunk
   void chop();                  // Chop this chunk
   void next_chop();             // Chop next chunk
   // Boundaries of data area (possibly unused)
   char* bottom() const { return ((char*) this) + sizeof(Chunk);  }
   char* top()    const { return bottom() + _len; }
 };
 //------------------------------Arena------------------------------------------
 // Fast allocation of memory
 class Arena: public CHeapObj {
 protected:
   friend class ResourceMark;
   friend class HandleMark;
   friend class NoHandleMark;
   Chunk *_first;                // First chunk
   Chunk *_chunk;                // current chunk
   char *_hwm, *_max;            // High water mark and max in current chunk
   void* grow(size_t x);         // Get a new Chunk of at least size x
   size_t _size_in_bytes;          // Size of arena (used for memory usage tracing)
 public:
   Arena();
   Arena(size_t init_size);
   Arena(Arena *old);
   ~Arena()                      { _first->chop(); }
   char* hwm() const             { return _hwm; }
   // Fast allocate in the arena.  Common case is: pointer test + increment.
   void* Amalloc(size_t x) {
 #ifdef _LP64
     x = (x + (8-1)) & ((unsigned)(-8));
 #else
     x = (x + (4-1)) & ((unsigned)(-4));
 #endif
     if (_hwm + x > _max) {
       return grow(x);
     } else {
       char *old = _hwm;
       _hwm += x;
       return old;
     }
   }
   // Further assume size is padded out to words
   // Warning:  in LP64, Amalloc_4 is really Amalloc_8
   void *Amalloc_4(size_t x) {
     assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" );
     if (_hwm + x > _max) {
       return grow(x);
     } else {
       char *old = _hwm;
       _hwm += x;
       return old;
     }
   }
   // Fast delete in area.  Common case is: NOP (except for storage reclaimed)
   void Afree(void *ptr, size_t size) {
     if (((char*)ptr) + size == _hwm) _hwm = (char*)ptr;
   }
   void *Acalloc( size_t items, size_t x );
   void *Arealloc( void *old_ptr, size_t old_size, size_t new_size );
   // Reset this Arena to empty, and return this Arenas guts in a new Arena.
   Arena *reset(void);
   // Determine if pointer belongs to this Arena or not.
   bool contains( const void *ptr ) const;
   // Total of all chunks in use (not thread-safe)
   size_t used() const;
   // Total # of bytes used
   size_t size_in_bytes() const         {  return _size_in_bytes; }
   void   set_size_in_bytes(size_t size)  { _size_in_bytes = size;   }
 };
 #endif // SHARE_VM_ADLC_ARENA_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/adlc/arena.hpp@f90c822e73f8 (annotated)

src/share/vm/adlc/arena.hpp