jdk8-mips64-public/hotspot: src/share/vm/gc_implementation/concurrentMarkSweep/freeChunk.cpp@a9becfeecd1b

     1 /*

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     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

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     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

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    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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    25 #include "precompiled.hpp"

    26 #include "gc_implementation/concurrentMarkSweep/freeChunk.hpp"

    27 #include "memory/freeBlockDictionary.hpp"

    28 #include "utilities/copy.hpp"

    30 #ifndef PRODUCT

    32 #define baadbabeHeapWord badHeapWordVal

    33 #define deadbeefHeapWord 0xdeadbeef

    35 size_t const FreeChunk::header_size() {

    36   return sizeof(FreeChunk)/HeapWordSize;

    37 }

    39 void FreeChunk::mangleAllocated(size_t size) {

    40   // mangle all but the header of a just-allocated block

    41   // of storage

    42   assert(size >= MinChunkSize, "smallest size of object");

    43   // we can't assert that _size == size because this may be an

    44   // allocation out of a linear allocation block

    45   assert(sizeof(FreeChunk) % HeapWordSize == 0,

    46          "shouldn't write beyond chunk");

    47   HeapWord* addr = (HeapWord*)this;

    48   size_t hdr = header_size();

    49   Copy::fill_to_words(addr + hdr, size - hdr, baadbabeHeapWord);

    50 }

    52 void FreeChunk::mangleFreed(size_t sz) {

    53   assert(baadbabeHeapWord != deadbeefHeapWord, "Need distinct patterns");

    54   // mangle all but the header of a just-freed block of storage

    55   // just prior to passing it to the storage dictionary

    56   assert(sz >= MinChunkSize, "smallest size of object");

    57   assert(sz == size(), "just checking");

    58   HeapWord* addr = (HeapWord*)this;

    59   size_t hdr = header_size();

    60   Copy::fill_to_words(addr + hdr, sz - hdr, deadbeefHeapWord);

    61 }

    63 void FreeChunk::verifyList() const {

    64   FreeChunk* nextFC = next();

    65   if (nextFC != NULL) {

    66     assert(this == nextFC->prev(), "broken chain");

    67     assert(size() == nextFC->size(), "wrong size");

    68     nextFC->verifyList();

    69   }

    70 }

    71 #endif

    73 void FreeChunk::print_on(outputStream* st) {

    74   st->print_cr("Next: " PTR_FORMAT " Prev: " PTR_FORMAT " %s",

    75     next(), prev(), cantCoalesce() ? "[can't coalesce]" : "");

    76 }

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