rev 48019 : 8191821: Finer granularity for GC verification
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   1 /*
   2  * Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
   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
   7  * published by the Free Software Foundation.
   8  *
   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
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  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
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_GC_G1_G1HEAPVERIFIER_HPP
  26 #define SHARE_VM_GC_G1_G1HEAPVERIFIER_HPP
  27 
  28 #include "gc/g1/heapRegionSet.hpp"
  29 #include "memory/allocation.hpp"
  30 #include "memory/universe.hpp"
  31 
  32 class G1CollectedHeap;
  33 
  34 class G1HeapVerifier : public CHeapObj<mtGC> {
  35 private:
  36   G1CollectedHeap* _g1h;

  37 
  38   // verify_region_sets() performs verification over the region
  39   // lists. It will be compiled in the product code to be used when
  40   // necessary (i.e., during heap verification).
  41   void verify_region_sets();
  42 
  43 public:
  44 
  45   G1HeapVerifier(G1CollectedHeap* heap) : _g1h(heap) { }












  46 
  47   // Perform verification.
  48 
  49   // vo == UsePrevMarking -> use "prev" marking information,
  50   // vo == UseNextMarking -> use "next" marking information
  51   // vo == UseFullMarking -> use "next" marking bitmap but no TAMS
  52   //
  53   // NOTE: Only the "prev" marking information is guaranteed to be
  54   // consistent most of the time, so most calls to this should use
  55   // vo == UsePrevMarking.
  56   // Currently, there is only one case where this is called with
  57   // vo == UseNextMarking, which is to verify the "next" marking
  58   // information at the end of remark.
  59   // Currently there is only one place where this is called with
  60   // vo == UseFullMarking, which is to verify the marking during a
  61   // full GC.
  62   void verify(VerifyOption vo);
  63 
  64   // verify_region_sets_optional() is planted in the code for
  65   // list verification in non-product builds (and it can be enabled in
  66   // product builds by defining HEAP_REGION_SET_FORCE_VERIFY to be 1).
  67 #if HEAP_REGION_SET_FORCE_VERIFY
  68   void verify_region_sets_optional() {
  69     verify_region_sets();
  70   }
  71 #else // HEAP_REGION_SET_FORCE_VERIFY
  72   void verify_region_sets_optional() { }
  73 #endif // HEAP_REGION_SET_FORCE_VERIFY
  74 
  75   void prepare_for_verify();
  76   double verify(bool guard, const char* msg);
  77   void verify_before_gc();
  78   void verify_after_gc();
  79 
  80 #ifndef PRODUCT
  81   // Make sure that the given bitmap has no marked objects in the
  82   // range [from,limit). If it does, print an error message and return
  83   // false. Otherwise, just return true. bitmap_name should be "prev"
  84   // or "next".
  85   bool verify_no_bits_over_tams(const char* bitmap_name, const G1CMBitMap* const bitmap,
  86                                 HeapWord* from, HeapWord* limit);
  87 
  88   // Verify that the prev / next bitmap range [tams,end) for the given
  89   // region has no marks. Return true if all is well, false if errors
  90   // are detected.
  91   bool verify_bitmaps(const char* caller, HeapRegion* hr);
  92 #endif // PRODUCT
  93 
  94   // If G1VerifyBitmaps is set, verify that the marking bitmaps for
  95   // the given region do not have any spurious marks. If errors are
  96   // detected, print appropriate error messages and crash.
  97   void check_bitmaps(const char* caller, HeapRegion* hr) PRODUCT_RETURN;
  98 
  99   // If G1VerifyBitmaps is set, verify that the marking bitmaps do not
 100   // have any spurious marks. If errors are detected, print
 101   // appropriate error messages and crash.
 102   void check_bitmaps(const char* caller) PRODUCT_RETURN;
 103 
 104   // Do sanity check on the contents of the in-cset fast test table.
 105   bool check_cset_fast_test() PRODUCT_RETURN_( return true; );
 106 
 107   void verify_card_table_cleanup() PRODUCT_RETURN;
 108 
 109   void verify_not_dirty_region(HeapRegion* hr) PRODUCT_RETURN;
 110   void verify_dirty_region(HeapRegion* hr) PRODUCT_RETURN;
 111   void verify_dirty_young_regions() PRODUCT_RETURN;
 112 
 113   static void verify_archive_regions();
 114 };
 115 
 116 #endif // SHARE_VM_GC_G1_G1HEAPVERIFIER_HPP
--- EOF ---