--- a/src/hotspot/share/gc/cms/freeChunk.hpp	Thu Nov 14 12:38:31 2019 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,150 +0,0 @@
-/*
- * Copyright (c) 2001, 2019, 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_GC_CMS_FREECHUNK_HPP
-#define SHARE_GC_CMS_FREECHUNK_HPP
-
-#include "memory/memRegion.hpp"
-#include "oops/markWord.hpp"
-#include "runtime/mutex.hpp"
-#include "runtime/orderAccess.hpp"
-#include "utilities/debug.hpp"
-#include "utilities/globalDefinitions.hpp"
-#include "utilities/ostream.hpp"
-
-//
-// Free block maintenance for Concurrent Mark Sweep Generation
-//
-// The main data structure for free blocks are
-// . an indexed array of small free blocks, and
-// . a dictionary of large free blocks
-//
-
-// No virtuals in FreeChunk (don't want any vtables).
-
-// A FreeChunk is merely a chunk that can be in a doubly linked list
-// and has a size field. NOTE: FreeChunks are distinguished from allocated
-// objects in two ways (by the sweeper), depending on whether the VM is 32 or
-// 64 bits.
-// In 32 bits or 64 bits without CompressedOops, the second word (prev) has the
-// LSB set to indicate a free chunk; allocated objects' klass() pointers
-// don't have their LSB set. The corresponding bit in the CMSBitMap is
-// set when the chunk is allocated. There are also blocks that "look free"
-// but are not part of the free list and should not be coalesced into larger
-// free blocks. These free blocks have their two LSB's set.
-
-class FreeChunk {
-  friend class VMStructs;
-  // For 64 bit compressed oops, the markWord encodes both the size and the
-  // indication that this is a FreeChunk and not an object.
-  volatile size_t   _size;
-  FreeChunk* _prev;
-  FreeChunk* _next;
-
-  markWord mark()     const volatile { return markWord((uintptr_t)_size); }
-  void set_mark(markWord m)          { _size = (size_t)m.value(); }
-
- public:
-  NOT_PRODUCT(static const size_t header_size();)
-
-  // Returns "true" if the address indicates that the block represents
-  // a free chunk.
-  static bool indicatesFreeChunk(const HeapWord* addr) {
-    // Force volatile read from addr because value might change between
-    // calls.  We really want the read of _mark and _prev from this pointer
-    // to be volatile but making the fields volatile causes all sorts of
-    // compilation errors.
-    return ((volatile FreeChunk*)addr)->is_free();
-  }
-
-  bool is_free() const volatile {
-    LP64_ONLY(if (UseCompressedOops) return mark().is_cms_free_chunk(); else)
-    return (((intptr_t)_prev) & 0x1) == 0x1;
-  }
-  bool cantCoalesce() const {
-    assert(is_free(), "can't get coalesce bit on not free");
-    return (((intptr_t)_prev) & 0x2) == 0x2;
-  }
-  void dontCoalesce() {
-    // the block should be free
-    assert(is_free(), "Should look like a free block");
-    _prev = (FreeChunk*)(((intptr_t)_prev) | 0x2);
-  }
-  FreeChunk* prev() const {
-    return (FreeChunk*)(((intptr_t)_prev) & ~(0x3));
-  }
-
-  debug_only(void* prev_addr() const { return (void*)&_prev; })
-  debug_only(void* next_addr() const { return (void*)&_next; })
-  debug_only(void* size_addr() const { return (void*)&_size; })
-
-  size_t size() const volatile {
-    LP64_ONLY(if (UseCompressedOops) return mark().get_size(); else )
-    return _size;
-  }
-  void set_size(size_t sz) {
-    LP64_ONLY(if (UseCompressedOops) set_mark(markWord::set_size_and_free(sz)); else )
-    _size = sz;
-  }
-
-  FreeChunk* next()   const { return _next; }
-
-  void link_after(FreeChunk* ptr) {
-    link_next(ptr);
-    if (ptr != NULL) ptr->link_prev(this);
-  }
-  void link_next(FreeChunk* ptr) { _next = ptr; }
-  void link_prev(FreeChunk* ptr) {
-    LP64_ONLY(if (UseCompressedOops) _prev = ptr; else)
-    _prev = (FreeChunk*)((intptr_t)ptr | 0x1);
-  }
-  void clear_next()              { _next = NULL; }
-  void markNotFree() {
-    // Set _prev (klass) to null before (if) clearing the mark word below
-    _prev = NULL;
-#ifdef _LP64
-    if (UseCompressedOops) {
-      OrderAccess::storestore();
-      set_mark(markWord::prototype());
-    }
-#endif
-    assert(!is_free(), "Error");
-  }
-
-  // Return the address past the end of this chunk
-  uintptr_t* end() const { return ((uintptr_t*) this) + size(); }
-
-  // debugging
-  void verify()             const PRODUCT_RETURN;
-  void verifyList()         const PRODUCT_RETURN;
-  void mangleAllocated(size_t size) PRODUCT_RETURN;
-  void mangleFreed(size_t size)     PRODUCT_RETURN;
-
-  void print_on(outputStream* st);
-};
-
-extern size_t MinChunkSize;
-
-
-#endif // SHARE_GC_CMS_FREECHUNK_HPP