Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/heapRegion.inline.hpp @ 20417:d35872270666
8057658: Enable G1 FullGC extensions
Summary: Refactored the G1 FullGC code to enable it to be extended.
Reviewed-by: mgerdin, brutisso
author | sjohanss |
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date | Tue, 09 Sep 2014 00:05:25 +0200 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 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 * | |
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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. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_INLINE_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_INLINE_HPP | |
27 | |
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28 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" |
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29 #include "gc_implementation/g1/g1CollectedHeap.hpp" |
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30 #include "gc_implementation/g1/heapRegion.hpp" |
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31 #include "memory/space.hpp" |
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32 #include "runtime/atomic.inline.hpp" |
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33 |
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34 // This version requires locking. |
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35 inline HeapWord* G1OffsetTableContigSpace::allocate_impl(size_t size, |
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36 HeapWord* const end_value) { |
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37 HeapWord* obj = top(); |
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38 if (pointer_delta(end_value, obj) >= size) { |
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39 HeapWord* new_top = obj + size; |
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40 set_top(new_top); |
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41 assert(is_aligned(obj) && is_aligned(new_top), "checking alignment"); |
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42 return obj; |
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43 } else { |
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44 return NULL; |
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45 } |
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46 } |
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47 |
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48 // This version is lock-free. |
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49 inline HeapWord* G1OffsetTableContigSpace::par_allocate_impl(size_t size, |
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50 HeapWord* const end_value) { |
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51 do { |
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52 HeapWord* obj = top(); |
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53 if (pointer_delta(end_value, obj) >= size) { |
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54 HeapWord* new_top = obj + size; |
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55 HeapWord* result = (HeapWord*)Atomic::cmpxchg_ptr(new_top, top_addr(), obj); |
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56 // result can be one of two: |
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57 // the old top value: the exchange succeeded |
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58 // otherwise: the new value of the top is returned. |
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59 if (result == obj) { |
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60 assert(is_aligned(obj) && is_aligned(new_top), "checking alignment"); |
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61 return obj; |
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62 } |
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63 } else { |
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64 return NULL; |
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65 } |
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66 } while (true); |
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67 } |
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68 |
342 | 69 inline HeapWord* G1OffsetTableContigSpace::allocate(size_t size) { |
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70 HeapWord* res = allocate_impl(size, end()); |
342 | 71 if (res != NULL) { |
72 _offsets.alloc_block(res, size); | |
73 } | |
74 return res; | |
75 } | |
76 | |
77 // Because of the requirement of keeping "_offsets" up to date with the | |
78 // allocations, we sequentialize these with a lock. Therefore, best if | |
79 // this is used for larger LAB allocations only. | |
80 inline HeapWord* G1OffsetTableContigSpace::par_allocate(size_t size) { | |
81 MutexLocker x(&_par_alloc_lock); | |
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82 return allocate(size); |
342 | 83 } |
84 | |
85 inline HeapWord* G1OffsetTableContigSpace::block_start(const void* p) { | |
86 return _offsets.block_start(p); | |
87 } | |
88 | |
89 inline HeapWord* | |
90 G1OffsetTableContigSpace::block_start_const(const void* p) const { | |
91 return _offsets.block_start_const(p); | |
92 } | |
1972 | 93 |
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94 inline bool |
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95 HeapRegion::block_is_obj(const HeapWord* p) const { |
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96 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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97 if (ClassUnloadingWithConcurrentMark) { |
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98 return !g1h->is_obj_dead(oop(p), this); |
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99 } |
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100 return p < top(); |
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101 } |
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102 |
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103 inline size_t |
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104 HeapRegion::block_size(const HeapWord *addr) const { |
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105 if (addr == top()) { |
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106 return pointer_delta(end(), addr); |
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107 } |
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108 |
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109 if (block_is_obj(addr)) { |
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110 return oop(addr)->size(); |
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111 } |
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112 |
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113 assert(ClassUnloadingWithConcurrentMark, |
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114 err_msg("All blocks should be objects if G1 Class Unloading isn't used. " |
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115 "HR: ["PTR_FORMAT", "PTR_FORMAT", "PTR_FORMAT") " |
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116 "addr: " PTR_FORMAT, |
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117 p2i(bottom()), p2i(top()), p2i(end()), p2i(addr))); |
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118 |
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119 // Old regions' dead objects may have dead classes |
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120 // We need to find the next live object in some other |
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121 // manner than getting the oop size |
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122 G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
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123 HeapWord* next = g1h->concurrent_mark()->prevMarkBitMap()-> |
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124 getNextMarkedWordAddress(addr, prev_top_at_mark_start()); |
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125 |
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126 assert(next > addr, "must get the next live object"); |
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127 return pointer_delta(next, addr); |
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128 } |
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129 |
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130 inline HeapWord* HeapRegion::par_allocate_no_bot_updates(size_t word_size) { |
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131 assert(is_young(), "we can only skip BOT updates on young regions"); |
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132 return par_allocate_impl(word_size, end()); |
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133 } |
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134 |
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135 inline HeapWord* HeapRegion::allocate_no_bot_updates(size_t word_size) { |
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136 assert(is_young(), "we can only skip BOT updates on young regions"); |
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137 return allocate_impl(word_size, end()); |
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138 } |
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139 |
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140 inline void HeapRegion::note_start_of_marking() { |
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141 _next_marked_bytes = 0; |
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142 _next_top_at_mark_start = top(); |
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143 } |
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144 |
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145 inline void HeapRegion::note_end_of_marking() { |
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146 _prev_top_at_mark_start = _next_top_at_mark_start; |
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147 _prev_marked_bytes = _next_marked_bytes; |
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148 _next_marked_bytes = 0; |
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149 |
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150 assert(_prev_marked_bytes <= |
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151 (size_t) pointer_delta(prev_top_at_mark_start(), bottom()) * |
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152 HeapWordSize, "invariant"); |
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153 } |
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154 |
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155 inline void HeapRegion::note_start_of_copying(bool during_initial_mark) { |
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156 if (is_survivor()) { |
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157 // This is how we always allocate survivors. |
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158 assert(_next_top_at_mark_start == bottom(), "invariant"); |
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159 } else { |
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160 if (during_initial_mark) { |
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161 // During initial-mark we'll explicitly mark any objects on old |
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162 // regions that are pointed to by roots. Given that explicit |
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163 // marks only make sense under NTAMS it'd be nice if we could |
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164 // check that condition if we wanted to. Given that we don't |
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165 // know where the top of this region will end up, we simply set |
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166 // NTAMS to the end of the region so all marks will be below |
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167 // NTAMS. We'll set it to the actual top when we retire this region. |
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168 _next_top_at_mark_start = end(); |
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169 } else { |
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170 // We could have re-used this old region as to-space over a |
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171 // couple of GCs since the start of the concurrent marking |
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172 // cycle. This means that [bottom,NTAMS) will contain objects |
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173 // copied up to and including initial-mark and [NTAMS, top) |
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174 // will contain objects copied during the concurrent marking cycle. |
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175 assert(top() >= _next_top_at_mark_start, "invariant"); |
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176 } |
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177 } |
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178 } |
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179 |
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180 inline void HeapRegion::note_end_of_copying(bool during_initial_mark) { |
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181 if (is_survivor()) { |
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182 // This is how we always allocate survivors. |
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183 assert(_next_top_at_mark_start == bottom(), "invariant"); |
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184 } else { |
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185 if (during_initial_mark) { |
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186 // See the comment for note_start_of_copying() for the details |
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187 // on this. |
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188 assert(_next_top_at_mark_start == end(), "pre-condition"); |
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189 _next_top_at_mark_start = top(); |
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190 } else { |
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191 // See the comment for note_start_of_copying() for the details |
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192 // on this. |
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193 assert(top() >= _next_top_at_mark_start, "invariant"); |
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194 } |
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195 } |
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196 } |
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197 |
1972 | 198 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_INLINE_HPP |