1 /* 2 * Copyright (c) 2016, 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 == UseMarkWord -> use the mark word in the object header 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 == UseMarkWord, 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, G1CMBitMapRO* 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 }; 113 114 #endif // SHARE_VM_GC_G1_G1HEAPVERIFIER_HPP