Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/shared/spaceDecorator.cpp @ 1562:dfe27f03244a
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date | Tue, 01 Jun 2010 11:48:33 -0700 |
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1 /* |
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2 * Copyright (c) 2002, 2008, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 * |
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23 */ |
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24 |
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25 # include "incls/_precompiled.incl" |
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26 # include "incls/_spaceDecorator.cpp.incl" |
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27 |
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28 // Catch-all file for utility classes |
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29 |
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30 #ifndef PRODUCT |
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31 |
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32 // Returns true is the location q matches the mangling |
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33 // pattern. |
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34 bool SpaceMangler::is_mangled(HeapWord* q) { |
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35 // This test loses precision but is good enough |
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36 return badHeapWord == (max_juint & (uintptr_t) q->value()); |
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37 } |
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38 |
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39 |
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40 void SpaceMangler::set_top_for_allocations(HeapWord* v) { |
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41 if (v < end()) { |
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42 assert(!CheckZapUnusedHeapArea || is_mangled(v), |
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43 "The high water mark is not mangled"); |
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44 } |
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45 _top_for_allocations = v; |
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46 } |
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47 |
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48 // Mangle only the unused space that has not previously |
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49 // been mangled and that has not been allocated since being |
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50 // mangled. |
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51 void SpaceMangler::mangle_unused_area() { |
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52 assert(ZapUnusedHeapArea, "Mangling should not be in use"); |
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53 // Mangle between top and the high water mark. Safeguard |
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54 // against the space changing since top_for_allocations was |
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55 // set. |
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56 HeapWord* mangled_end = MIN2(top_for_allocations(), end()); |
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57 if (top() < mangled_end) { |
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58 MemRegion mangle_mr(top(), mangled_end); |
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59 SpaceMangler::mangle_region(mangle_mr); |
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60 // Light weight check of mangling. |
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61 check_mangled_unused_area(end()); |
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62 } |
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63 // Complete check of unused area which is functional when |
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64 // DEBUG_MANGLING is defined. |
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65 check_mangled_unused_area_complete(); |
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66 } |
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67 |
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68 // A complete mangle is expected in the |
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69 // exceptional case where top_for_allocations is not |
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70 // properly tracking the high water mark for mangling. |
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71 // This can be the case when to-space is being used for |
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72 // scratch space during a mark-sweep-compact. See |
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73 // contribute_scratch() and PSMarkSweep::allocate_stacks(). |
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74 void SpaceMangler::mangle_unused_area_complete() { |
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75 assert(ZapUnusedHeapArea, "Mangling should not be in use"); |
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76 MemRegion mangle_mr(top(), end()); |
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77 SpaceMangler::mangle_region(mangle_mr); |
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78 } |
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79 |
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80 // Simply mangle the MemRegion mr. |
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81 void SpaceMangler::mangle_region(MemRegion mr) { |
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82 assert(ZapUnusedHeapArea, "Mangling should not be in use"); |
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83 #ifdef ASSERT |
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84 if(TraceZapUnusedHeapArea) { |
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85 gclog_or_tty->print("Mangling [0x%x to 0x%x)", mr.start(), mr.end()); |
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86 } |
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87 Copy::fill_to_words(mr.start(), mr.word_size(), badHeapWord); |
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88 if(TraceZapUnusedHeapArea) { |
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89 gclog_or_tty->print_cr(" done"); |
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90 } |
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91 #endif |
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92 } |
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93 |
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94 // Check that top, top_for_allocations and the last |
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95 // word of the space are mangled. In a tight memory |
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96 // situation even this light weight mangling could |
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97 // cause paging by touching the end of the space. |
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98 void SpaceMangler::check_mangled_unused_area(HeapWord* limit) { |
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99 if (CheckZapUnusedHeapArea) { |
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100 // This method can be called while the spaces are |
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101 // being reshaped so skip the test if the end of the |
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102 // space is beyond the specified limit; |
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103 if (end() > limit) return; |
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104 |
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105 assert(top() == end() || |
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106 (is_mangled(top())), "Top not mangled"); |
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107 assert((top_for_allocations() < top()) || |
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108 (top_for_allocations() >= end()) || |
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109 (is_mangled(top_for_allocations())), |
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110 "Older unused not mangled"); |
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111 assert(top() == end() || |
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112 (is_mangled(end() - 1)), "End not properly mangled"); |
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113 // Only does checking when DEBUG_MANGLING is defined. |
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114 check_mangled_unused_area_complete(); |
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115 } |
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116 } |
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117 |
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118 #undef DEBUG_MANGLING |
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119 // This should only be used while debugging the mangling |
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120 // because of the high cost of checking the completeness. |
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121 void SpaceMangler::check_mangled_unused_area_complete() { |
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122 if (CheckZapUnusedHeapArea) { |
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123 assert(ZapUnusedHeapArea, "Not mangling unused area"); |
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124 #ifdef DEBUG_MANGLING |
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125 HeapWord* q = top(); |
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126 HeapWord* limit = end(); |
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127 |
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128 bool passed = true; |
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129 while (q < limit) { |
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130 if (!is_mangled(q)) { |
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131 passed = false; |
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132 break; |
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133 } |
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134 q++; |
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135 } |
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136 assert(passed, "Mangling is not complete"); |
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137 #endif |
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138 } |
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139 } |
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140 #undef DEBUG_MANGLING |
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141 #endif // not PRODUCT |