Mercurial > jdk8-mips64-public > hotspot / changeset

     1.1 --- a/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.cpp	Thu Aug 13 06:55:26 2020 +0100
     1.2 +++ b/src/share/vm/gc_implementation/concurrentMarkSweep/compactibleFreeListSpace.cpp	Fri Jul 17 07:03:30 2020 +0800
     1.3 @@ -1,5 +1,5 @@
     1.4  /*
     1.5 - * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved.
     1.6 + * Copyright (c) 2001, 2020, Oracle and/or its affiliates. All rights reserved.
     1.7   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
     1.8   *
     1.9   * This code is free software; you can redistribute it and/or modify it
    1.10 @@ -994,6 +994,10 @@
    1.11          return res;
    1.12        }
    1.13      } else {
    1.14 +      // The barrier is required to prevent reordering of the free chunk check
    1.15 +      // and the klass read.
    1.16 +      OrderAccess::loadload();
    1.17 +
    1.18        // must read from what 'p' points to in each loop.
    1.19        Klass* k = ((volatile oopDesc*)p)->klass_or_null();
    1.20        if (k != NULL) {
    1.21 @@ -1049,6 +1053,10 @@
    1.22          return res;
    1.23        }
    1.24      } else {
    1.25 +      // The barrier is required to prevent reordering of the free chunk check
    1.26 +      // and the klass read.
    1.27 +      OrderAccess::loadload();
    1.28 +
    1.29        // must read from what 'p' points to in each loop.
    1.30        Klass* k = ((volatile oopDesc*)p)->klass_or_null();
    1.31        // We trust the size of any object that has a non-NULL
    1.32 @@ -1111,6 +1119,11 @@
    1.33    // assert(CollectedHeap::use_parallel_gc_threads() || _bt.block_start(p) == p,
    1.34    //        "Should be a block boundary");
    1.35    if (FreeChunk::indicatesFreeChunk(p)) return false;
    1.36 +
    1.37 +  // The barrier is required to prevent reordering of the free chunk check
    1.38 +  // and the klass read.
    1.39 +  OrderAccess::loadload();
    1.40 +
    1.41    Klass* k = oop(p)->klass_or_null();
    1.42    if (k != NULL) {
    1.43      // Ignore mark word because it may have been used to