Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegionSet.hpp @ 19083:09292c24d555
LSStackSlotAllocator: hide inner class.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Sat, 31 Jan 2015 11:07:15 +0100 |
parents | 78bbf4d43a14 |
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2152 | 1 /* |
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2 * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved. |
2152 | 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_IMPLEMENTATION_G1_HEAPREGIONSET_HPP | |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSET_HPP | |
27 | |
28 #include "gc_implementation/g1/heapRegion.hpp" | |
29 | |
30 // Large buffer for some cases where the output might be larger than normal. | |
2361 | 31 #define HRS_ERR_MSG_BUFSZ 512 |
32 typedef FormatBuffer<HRS_ERR_MSG_BUFSZ> hrs_err_msg; | |
2152 | 33 |
34 // Set verification will be forced either if someone defines | |
35 // HEAP_REGION_SET_FORCE_VERIFY to be 1, or in builds in which | |
36 // asserts are compiled in. | |
37 #ifndef HEAP_REGION_SET_FORCE_VERIFY | |
38 #define HEAP_REGION_SET_FORCE_VERIFY defined(ASSERT) | |
39 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
40 | |
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41 class hrs_ext_msg; |
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42 |
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43 class HRSMtSafeChecker : public CHeapObj<mtGC> { |
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44 public: |
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45 virtual void check() = 0; |
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46 }; |
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47 |
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48 class MasterFreeRegionListMtSafeChecker : public HRSMtSafeChecker { public: void check(); }; |
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49 class SecondaryFreeRegionListMtSafeChecker : public HRSMtSafeChecker { public: void check(); }; |
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50 class HumongousRegionSetMtSafeChecker : public HRSMtSafeChecker { public: void check(); }; |
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51 class OldRegionSetMtSafeChecker : public HRSMtSafeChecker { public: void check(); }; |
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52 |
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53 class HeapRegionSetCount VALUE_OBJ_CLASS_SPEC { |
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54 friend class VMStructs; |
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55 uint _length; |
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56 size_t _capacity; |
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57 |
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58 public: |
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59 HeapRegionSetCount() : _length(0), _capacity(0) { } |
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60 |
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61 const uint length() const { return _length; } |
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62 const size_t capacity() const { return _capacity; } |
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63 |
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64 void increment(uint length_to_add, size_t capacity_to_add) { |
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65 _length += length_to_add; |
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66 _capacity += capacity_to_add; |
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67 } |
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68 |
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69 void decrement(const uint length_to_remove, const size_t capacity_to_remove) { |
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70 _length -= length_to_remove; |
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71 _capacity -= capacity_to_remove; |
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72 } |
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73 }; |
2152 | 74 |
75 // Base class for all the classes that represent heap region sets. It | |
76 // contains the basic attributes that each set needs to maintain | |
77 // (e.g., length, region num, used bytes sum) plus any shared | |
78 // functionality (e.g., verification). | |
79 | |
80 class HeapRegionSetBase VALUE_OBJ_CLASS_SPEC { | |
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81 friend class VMStructs; |
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82 private: |
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83 bool _is_humongous; |
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84 bool _is_empty; |
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85 HRSMtSafeChecker* _mt_safety_checker; |
2152 | 86 |
87 protected: | |
88 // The number of regions added to the set. If the set contains | |
89 // only humongous regions, this reflects only 'starts humongous' | |
90 // regions and does not include 'continues humongous' ones. | |
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91 HeapRegionSetCount _count; |
2152 | 92 |
93 const char* _name; | |
94 | |
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95 bool _verify_in_progress; |
4072 | 96 |
2152 | 97 // verify_region() is used to ensure that the contents of a region |
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98 // added to / removed from a set are consistent. |
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99 void verify_region(HeapRegion* hr) PRODUCT_RETURN; |
2152 | 100 |
101 // Indicates whether all regions in the set should be humongous or | |
102 // not. Only used during verification. | |
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103 bool regions_humongous() { return _is_humongous; } |
2152 | 104 |
105 // Indicates whether all regions in the set should be empty or | |
106 // not. Only used during verification. | |
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107 bool regions_empty() { return _is_empty; } |
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108 |
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109 void check_mt_safety() { |
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110 if (_mt_safety_checker != NULL) { |
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111 _mt_safety_checker->check(); |
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112 } |
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113 } |
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114 |
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115 virtual void fill_in_ext_msg_extra(hrs_ext_msg* msg) { } |
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116 |
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117 HeapRegionSetBase(const char* name, bool humongous, bool empty, HRSMtSafeChecker* mt_safety_checker); |
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118 |
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119 public: |
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120 const char* name() { return _name; } |
2152 | 121 |
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122 uint length() { return _count.length(); } |
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123 |
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124 bool is_empty() { return _count.length() == 0; } |
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125 |
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126 size_t total_capacity_bytes() { |
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127 return _count.capacity(); |
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128 } |
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129 |
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130 // It updates the fields of the set to reflect hr being added to |
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131 // the set and tags the region appropriately. |
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132 inline void add(HeapRegion* hr); |
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133 |
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134 // It updates the fields of the set to reflect hr being removed |
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135 // from the set and tags the region appropriately. |
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136 inline void remove(HeapRegion* hr); |
2152 | 137 |
138 // fill_in_ext_msg() writes the the values of the set's attributes | |
2361 | 139 // in the custom err_msg (hrs_ext_msg). fill_in_ext_msg_extra() |
2152 | 140 // allows subclasses to append further information. |
2361 | 141 void fill_in_ext_msg(hrs_ext_msg* msg, const char* message); |
2152 | 142 |
143 virtual void verify(); | |
144 void verify_start(); | |
145 void verify_next_region(HeapRegion* hr); | |
146 void verify_end(); | |
147 | |
148 #if HEAP_REGION_SET_FORCE_VERIFY | |
149 void verify_optional() { | |
150 verify(); | |
151 } | |
152 #else // HEAP_REGION_SET_FORCE_VERIFY | |
153 void verify_optional() { } | |
154 #endif // HEAP_REGION_SET_FORCE_VERIFY | |
155 | |
156 virtual void print_on(outputStream* out, bool print_contents = false); | |
157 }; | |
158 | |
159 // Customized err_msg for heap region sets. Apart from a | |
160 // assert/guarantee-specific message it also prints out the values of | |
161 // the fields of the associated set. This can be very helpful in | |
162 // diagnosing failures. | |
2361 | 163 class hrs_ext_msg : public hrs_err_msg { |
2152 | 164 public: |
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165 hrs_ext_msg(HeapRegionSetBase* set, const char* message) : hrs_err_msg("%s","") { |
2152 | 166 set->fill_in_ext_msg(this, message); |
167 } | |
168 }; | |
169 | |
2361 | 170 #define hrs_assert_sets_match(_set1_, _set2_) \ |
2152 | 171 do { \ |
172 assert(((_set1_)->regions_humongous() == \ | |
173 (_set2_)->regions_humongous()) && \ | |
174 ((_set1_)->regions_empty() == (_set2_)->regions_empty()), \ | |
2361 | 175 hrs_err_msg("the contents of set %s and set %s should match", \ |
2152 | 176 (_set1_)->name(), (_set2_)->name())); \ |
177 } while (0) | |
178 | |
179 // This class represents heap region sets whose members are not | |
180 // explicitly tracked. It's helpful to group regions using such sets | |
181 // so that we can reason about all the region groups in the heap using | |
182 // the same interface (namely, the HeapRegionSetBase API). | |
183 | |
184 class HeapRegionSet : public HeapRegionSetBase { | |
185 public: | |
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186 HeapRegionSet(const char* name, bool humongous, HRSMtSafeChecker* mt_safety_checker): |
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187 HeapRegionSetBase(name, humongous, false /* empty */, mt_safety_checker) { } |
2152 | 188 |
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189 void bulk_remove(const HeapRegionSetCount& removed) { |
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190 _count.decrement(removed.length(), removed.capacity()); |
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191 } |
2152 | 192 }; |
193 | |
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194 // A set that links all the regions added to it in a doubly-linked |
2152 | 195 // list. We should try to avoid doing operations that iterate over |
196 // such lists in performance critical paths. Typically we should | |
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197 // add / remove one region at a time or concatenate two lists. There are |
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198 // two ways to treat your lists, ordered and un-ordered. All un-ordered |
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199 // operations are done in constant time. To keep a list ordered only use |
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200 // add_ordered() to add elements to the list. If a list is not ordered |
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201 // from start, there is no way to sort it later. |
2152 | 202 |
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203 class FreeRegionListIterator; |
2152 | 204 |
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205 class FreeRegionList : public HeapRegionSetBase { |
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206 friend class FreeRegionListIterator; |
2152 | 207 |
208 private: | |
209 HeapRegion* _head; | |
210 HeapRegion* _tail; | |
211 | |
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212 // _last is used to keep track of where we added an element the last |
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213 // time in ordered lists. It helps to improve performance when adding |
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214 // several ordered items in a row. |
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215 HeapRegion* _last; |
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216 |
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217 static uint _unrealistically_long_length; |
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218 |
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219 void add_as_head_or_tail(FreeRegionList* from_list, bool as_head); |
2152 | 220 |
221 protected: | |
2361 | 222 virtual void fill_in_ext_msg_extra(hrs_ext_msg* msg); |
2152 | 223 |
224 // See the comment for HeapRegionSetBase::clear() | |
225 virtual void clear(); | |
226 | |
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227 public: |
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228 FreeRegionList(const char* name, HRSMtSafeChecker* mt_safety_checker = NULL): |
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229 HeapRegionSetBase(name, false /* humongous */, true /* empty */, mt_safety_checker) { |
2152 | 230 clear(); |
231 } | |
232 | |
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233 void verify_list(); |
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234 |
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235 HeapRegion* head() { return _head; } |
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236 HeapRegion* tail() { return _tail; } |
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237 |
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238 static void set_unrealistically_long_length(uint len); |
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239 |
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240 // Add hr to the list. The region should not be a member of another set. |
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241 // Assumes that the list is ordered and will preserve that order. The order |
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242 // is determined by hrs_index. |
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243 inline void add_ordered(HeapRegion* hr); |
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244 |
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245 // It adds hr to the list as the new head. The region should not be |
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246 // a member of another set. |
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247 inline void add_as_head(HeapRegion* hr); |
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248 |
2152 | 249 // It adds hr to the list as the new tail. The region should not be |
250 // a member of another set. | |
251 inline void add_as_tail(HeapRegion* hr); | |
252 | |
253 // It removes and returns the head of the list. It assumes that the | |
254 // list is not empty so it will return a non-NULL value. | |
255 inline HeapRegion* remove_head(); | |
256 | |
257 // Convenience method. | |
258 inline HeapRegion* remove_head_or_null(); | |
259 | |
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260 // Removes and returns the last element (_tail) of the list. It assumes |
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261 // that the list isn't empty so that it can return a non-NULL value. |
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262 inline HeapRegion* remove_tail(); |
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263 |
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264 // Convenience method |
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265 inline HeapRegion* remove_tail_or_null(); |
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266 |
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267 // Removes from head or tail based on the given argument. |
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268 inline HeapRegion* remove_region(bool from_head); |
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269 |
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270 // Merge two ordered lists. The result is also ordered. The order is |
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271 // determined by hrs_index. |
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272 void add_ordered(FreeRegionList* from_list); |
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273 |
2152 | 274 // It moves the regions from from_list to this list and empties |
275 // from_list. The new regions will appear in the same order as they | |
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276 // were in from_list and be linked in the beginning of this list. |
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277 void add_as_head(FreeRegionList* from_list); |
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278 |
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279 // It moves the regions from from_list to this list and empties |
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280 // from_list. The new regions will appear in the same order as they |
2152 | 281 // were in from_list and be linked in the end of this list. |
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282 void add_as_tail(FreeRegionList* from_list); |
2152 | 283 |
284 // It empties the list by removing all regions from it. | |
285 void remove_all(); | |
286 | |
287 // It removes all regions in the list that are pending for removal | |
288 // (i.e., they have been tagged with "pending_removal"). The list | |
289 // must not be empty, target_count should reflect the exact number | |
290 // of regions that are pending for removal in the list, and | |
291 // target_count should be > 1 (currently, we never need to remove a | |
292 // single region using this). | |
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293 void remove_all_pending(uint target_count); |
2152 | 294 |
295 virtual void verify(); | |
296 | |
297 virtual void print_on(outputStream* out, bool print_contents = false); | |
298 }; | |
299 | |
2361 | 300 // Iterator class that provides a convenient way to iterate over the |
301 // regions of a HeapRegionLinkedList instance. | |
2152 | 302 |
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303 class FreeRegionListIterator : public StackObj { |
2152 | 304 private: |
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305 FreeRegionList* _list; |
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306 HeapRegion* _curr; |
2152 | 307 |
308 public: | |
309 bool more_available() { | |
310 return _curr != NULL; | |
311 } | |
312 | |
313 HeapRegion* get_next() { | |
314 assert(more_available(), | |
315 "get_next() should be called when more regions are available"); | |
316 | |
317 // If we are going to introduce a count in the iterator we should | |
318 // do the "cycle" check. | |
319 | |
320 HeapRegion* hr = _curr; | |
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321 _list->verify_region(hr); |
2152 | 322 _curr = hr->next(); |
323 return hr; | |
324 } | |
325 | |
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326 FreeRegionListIterator(FreeRegionList* list) : _curr(NULL), _list(list) { |
2152 | 327 _curr = list->head(); |
328 } | |
329 }; | |
330 | |
331 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSET_HPP |