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annotate src/share/vm/gc_implementation/g1/bufferingOopClosure.cpp @ 14355:937cf56dede6

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8033764: Remove the usage of StarTask from BufferingOopClosure Reviewed-by: mgerdin, brutisso, tschatzl
author stefank
date Mon, 10 Feb 2014 12:51:51 +0100
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14355
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1 /*
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2 * Copyright (c) 2014, 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 "precompiled.hpp"
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26 #include "gc_implementation/g1/bufferingOopClosure.hpp"
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27 #include "memory/iterator.hpp"
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28 #include "utilities/debug.hpp"
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29
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30 /////////////// Unit tests ///////////////
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31
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32 #ifndef PRODUCT
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33
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34 class TestBufferingOopClosure {
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35
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36 // Helper class to fake a set of oop*s and narrowOop*s.
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37 class FakeRoots {
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38 public:
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39 // Used for sanity checking of the values passed to the do_oops functions in the test.
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40 static const uintptr_t NarrowOopMarker = uintptr_t(1) << (BitsPerWord -1);
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41
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42 int _num_narrow;
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43 int _num_full;
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44 void** _narrow;
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45 void** _full;
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46
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47 FakeRoots(int num_narrow, int num_full) :
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48 _num_narrow(num_narrow),
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49 _num_full(num_full),
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50 _narrow((void**)::malloc(sizeof(void*) * num_narrow)),
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51 _full((void**)::malloc(sizeof(void*) * num_full)) {
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52
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53 for (int i = 0; i < num_narrow; i++) {
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54 _narrow[i] = (void*)(NarrowOopMarker + (uintptr_t)i);
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55 }
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56 for (int i = 0; i < num_full; i++) {
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57 _full[i] = (void*)(uintptr_t)i;
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58 }
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59 }
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60
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61 ~FakeRoots() {
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62 ::free(_narrow);
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63 ::free(_full);
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64 }
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65
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66 void oops_do_narrow_then_full(OopClosure* cl) {
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67 for (int i = 0; i < _num_narrow; i++) {
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68 cl->do_oop((narrowOop*)_narrow[i]);
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69 }
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70 for (int i = 0; i < _num_full; i++) {
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71 cl->do_oop((oop*)_full[i]);
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72 }
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73 }
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74
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75 void oops_do_full_then_narrow(OopClosure* cl) {
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76 for (int i = 0; i < _num_full; i++) {
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77 cl->do_oop((oop*)_full[i]);
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78 }
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79 for (int i = 0; i < _num_narrow; i++) {
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80 cl->do_oop((narrowOop*)_narrow[i]);
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81 }
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82 }
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83
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84 void oops_do_mixed(OopClosure* cl) {
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85 int i;
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86 for (i = 0; i < _num_full && i < _num_narrow; i++) {
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87 cl->do_oop((oop*)_full[i]);
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88 cl->do_oop((narrowOop*)_narrow[i]);
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89 }
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90 for (int j = i; j < _num_full; j++) {
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91 cl->do_oop((oop*)_full[i]);
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92 }
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93 for (int j = i; j < _num_narrow; j++) {
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94 cl->do_oop((narrowOop*)_narrow[i]);
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95 }
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96 }
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97
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98 static const int MaxOrder = 2;
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99
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100 void oops_do(OopClosure* cl, int do_oop_order) {
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101 switch(do_oop_order) {
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102 case 0:
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103 oops_do_narrow_then_full(cl);
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104 break;
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105 case 1:
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106 oops_do_full_then_narrow(cl);
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107 break;
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108 case 2:
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109 oops_do_mixed(cl);
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110 break;
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111 default:
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112 oops_do_narrow_then_full(cl);
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113 break;
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114 }
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115 }
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116 };
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117
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118 class CountOopClosure : public OopClosure {
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119 int _narrow_oop_count;
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120 int _full_oop_count;
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121 public:
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122 CountOopClosure() : _narrow_oop_count(0), _full_oop_count(0) {}
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123 void do_oop(narrowOop* p) {
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124 assert((uintptr_t(p) & FakeRoots::NarrowOopMarker) != 0,
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125 "The narrowOop was unexpectedly not marked with the NarrowOopMarker");
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126 _narrow_oop_count++;
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127 }
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128
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129 void do_oop(oop* p){
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130 assert((uintptr_t(p) & FakeRoots::NarrowOopMarker) == 0,
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131 "The oop was unexpectedly marked with the NarrowOopMarker");
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132 _full_oop_count++;
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133 }
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134
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135 int narrow_oop_count() { return _narrow_oop_count; }
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136 int full_oop_count() { return _full_oop_count; }
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137 int all_oop_count() { return _narrow_oop_count + _full_oop_count; }
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138 };
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139
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140 class DoNothingOopClosure : public OopClosure {
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141 public:
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142 void do_oop(narrowOop* p) {}
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143 void do_oop(oop* p) {}
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144 };
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145
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146 static void testCount(int num_narrow, int num_full, int do_oop_order) {
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147 FakeRoots fr(num_narrow, num_full);
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148
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149 CountOopClosure coc;
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150 BufferingOopClosure boc(&coc);
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151
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152 fr.oops_do(&boc, do_oop_order);
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153
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154 boc.done();
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155
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156 #define assert_testCount(got, expected) \
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157 assert((got) == (expected), \
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158 err_msg("Expected: %d, got: %d, when running testCount(%d, %d, %d)", \
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159 (got), (expected), num_narrow, num_full, do_oop_order))
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160
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161 assert_testCount(num_narrow, coc.narrow_oop_count());
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162 assert_testCount(num_full, coc.full_oop_count());
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163 assert_testCount(num_narrow + num_full, coc.all_oop_count());
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164 }
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165
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166 static void testCount() {
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167 int buffer_length = BufferingOopClosure::BufferLength;
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168
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169 for (int order = 0; order < FakeRoots::MaxOrder; order++) {
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170 testCount(0, 0, order);
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171 testCount(10, 0, order);
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172 testCount(0, 10, order);
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173 testCount(10, 10, order);
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174 testCount(buffer_length, 10, order);
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175 testCount(10, buffer_length, order);
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176 testCount(buffer_length, buffer_length, order);
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177 testCount(buffer_length + 1, 10, order);
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178 testCount(10, buffer_length + 1, order);
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179 testCount(buffer_length + 1, buffer_length, order);
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180 testCount(buffer_length, buffer_length + 1, order);
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181 testCount(buffer_length + 1, buffer_length + 1, order);
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182 }
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183 }
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184
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185 static void testIsBufferEmptyOrFull(int num_narrow, int num_full, bool expect_empty, bool expect_full) {
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186 FakeRoots fr(num_narrow, num_full);
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187
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188 DoNothingOopClosure cl;
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189 BufferingOopClosure boc(&cl);
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190
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191 fr.oops_do(&boc, 0);
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192
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193 #define assert_testIsBufferEmptyOrFull(got, expected) \
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194 assert((got) == (expected), \
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195 err_msg("Expected: %d, got: %d. testIsBufferEmptyOrFull(%d, %d, %s, %s)", \
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196 (got), (expected), num_narrow, num_full, \
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197 BOOL_TO_STR(expect_empty), BOOL_TO_STR(expect_full)))
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198
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199 assert_testIsBufferEmptyOrFull(expect_empty, boc.is_buffer_empty());
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200 assert_testIsBufferEmptyOrFull(expect_full, boc.is_buffer_full());
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201 }
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202
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203 static void testIsBufferEmptyOrFull() {
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204 int bl = BufferingOopClosure::BufferLength;
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205
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206 testIsBufferEmptyOrFull(0, 0, true, false);
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207 testIsBufferEmptyOrFull(1, 0, false, false);
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208 testIsBufferEmptyOrFull(0, 1, false, false);
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209 testIsBufferEmptyOrFull(1, 1, false, false);
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210 testIsBufferEmptyOrFull(10, 0, false, false);
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211 testIsBufferEmptyOrFull(0, 10, false, false);
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212 testIsBufferEmptyOrFull(10, 10, false, false);
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213 testIsBufferEmptyOrFull(0, bl, false, true);
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214 testIsBufferEmptyOrFull(bl, 0, false, true);
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215 testIsBufferEmptyOrFull(bl/2, bl/2, false, true);
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216 testIsBufferEmptyOrFull(bl-1, 1, false, true);
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217 testIsBufferEmptyOrFull(1, bl-1, false, true);
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218 // Processed
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219 testIsBufferEmptyOrFull(bl+1, 0, false, false);
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220 testIsBufferEmptyOrFull(bl*2, 0, false, true);
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221 }
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222
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223 static void testEmptyAfterDone(int num_narrow, int num_full) {
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224 FakeRoots fr(num_narrow, num_full);
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225
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226 DoNothingOopClosure cl;
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227 BufferingOopClosure boc(&cl);
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228
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229 fr.oops_do(&boc, 0);
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230
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231 // Make sure all get processed.
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232 boc.done();
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233
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234 assert(boc.is_buffer_empty(),
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235 err_msg("Should be empty after call to done(). testEmptyAfterDone(%d, %d)",
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236 num_narrow, num_full));
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237 }
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238
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239 static void testEmptyAfterDone() {
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240 int bl = BufferingOopClosure::BufferLength;
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241
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242 testEmptyAfterDone(0, 0);
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243 testEmptyAfterDone(1, 0);
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244 testEmptyAfterDone(0, 1);
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245 testEmptyAfterDone(1, 1);
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246 testEmptyAfterDone(10, 0);
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247 testEmptyAfterDone(0, 10);
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248 testEmptyAfterDone(10, 10);
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249 testEmptyAfterDone(0, bl);
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250 testEmptyAfterDone(bl, 0);
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251 testEmptyAfterDone(bl/2, bl/2);
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252 testEmptyAfterDone(bl-1, 1);
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253 testEmptyAfterDone(1, bl-1);
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254 // Processed
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255 testEmptyAfterDone(bl+1, 0);
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256 testEmptyAfterDone(bl*2, 0);
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257 }
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258
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259 public:
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260 static void test() {
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261 testCount();
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262 testIsBufferEmptyOrFull();
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263 testEmptyAfterDone();
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264 }
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265 };
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266
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267 void TestBufferingOopClosure_test() {
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268 TestBufferingOopClosure::test();
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269 }
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270
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271 #endif