Mercurial > hg > truffle
annotate src/share/vm/gc_interface/collectedHeap.cpp @ 4708:3c648b9ad052
7121373: Clean up CollectedHeap::is_in
Summary: Fixed G1CollectedHeap::is_in, added tests, cleaned up comments and made Space::is_in pure virtual.
Reviewed-by: brutisso, tonyp, jcoomes
author | stefank |
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date | Wed, 14 Dec 2011 12:15:26 +0100 |
parents | e5928e7dab26 |
children | b6a04c79ccbc |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/systemDictionary.hpp" | |
27 #include "gc_implementation/shared/vmGCOperations.hpp" | |
28 #include "gc_interface/collectedHeap.hpp" | |
29 #include "gc_interface/collectedHeap.inline.hpp" | |
30 #include "oops/oop.inline.hpp" | |
4009 | 31 #include "oops/instanceMirrorKlass.hpp" |
1972 | 32 #include "runtime/init.hpp" |
33 #include "services/heapDumper.hpp" | |
34 #ifdef TARGET_OS_FAMILY_linux | |
35 # include "thread_linux.inline.hpp" | |
36 #endif | |
37 #ifdef TARGET_OS_FAMILY_solaris | |
38 # include "thread_solaris.inline.hpp" | |
39 #endif | |
40 #ifdef TARGET_OS_FAMILY_windows | |
41 # include "thread_windows.inline.hpp" | |
42 #endif | |
3960 | 43 #ifdef TARGET_OS_FAMILY_bsd |
44 # include "thread_bsd.inline.hpp" | |
45 #endif | |
0 | 46 |
47 | |
48 #ifdef ASSERT | |
49 int CollectedHeap::_fire_out_of_memory_count = 0; | |
50 #endif | |
51 | |
481
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52 size_t CollectedHeap::_filler_array_max_size = 0; |
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53 |
0 | 54 // Memory state functions. |
55 | |
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56 |
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57 CollectedHeap::CollectedHeap() : _n_par_threads(0) |
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58 |
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59 { |
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60 const size_t max_len = size_t(arrayOopDesc::max_array_length(T_INT)); |
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61 const size_t elements_per_word = HeapWordSize / sizeof(jint); |
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62 _filler_array_max_size = align_object_size(filler_array_hdr_size() + |
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63 max_len * elements_per_word); |
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64 |
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65 _barrier_set = NULL; |
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66 _is_gc_active = false; |
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67 _total_collections = _total_full_collections = 0; |
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68 _gc_cause = _gc_lastcause = GCCause::_no_gc; |
0 | 69 NOT_PRODUCT(_promotion_failure_alot_count = 0;) |
70 NOT_PRODUCT(_promotion_failure_alot_gc_number = 0;) | |
71 | |
72 if (UsePerfData) { | |
73 EXCEPTION_MARK; | |
74 | |
75 // create the gc cause jvmstat counters | |
76 _perf_gc_cause = PerfDataManager::create_string_variable(SUN_GC, "cause", | |
77 80, GCCause::to_string(_gc_cause), CHECK); | |
78 | |
79 _perf_gc_lastcause = | |
80 PerfDataManager::create_string_variable(SUN_GC, "lastCause", | |
81 80, GCCause::to_string(_gc_lastcause), CHECK); | |
82 } | |
1166 | 83 _defer_initial_card_mark = false; // strengthened by subclass in pre_initialize() below. |
0 | 84 } |
85 | |
1166 | 86 void CollectedHeap::pre_initialize() { |
87 // Used for ReduceInitialCardMarks (when COMPILER2 is used); | |
88 // otherwise remains unused. | |
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89 #ifdef COMPILER2 |
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90 _defer_initial_card_mark = ReduceInitialCardMarks && can_elide_tlab_store_barriers() |
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91 && (DeferInitialCardMark || card_mark_must_follow_store()); |
1166 | 92 #else |
93 assert(_defer_initial_card_mark == false, "Who would set it?"); | |
94 #endif | |
95 } | |
0 | 96 |
97 #ifndef PRODUCT | |
98 void CollectedHeap::check_for_bad_heap_word_value(HeapWord* addr, size_t size) { | |
99 if (CheckMemoryInitialization && ZapUnusedHeapArea) { | |
100 for (size_t slot = 0; slot < size; slot += 1) { | |
101 assert((*(intptr_t*) (addr + slot)) != ((intptr_t) badHeapWordVal), | |
102 "Found badHeapWordValue in post-allocation check"); | |
103 } | |
104 } | |
105 } | |
106 | |
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107 void CollectedHeap::check_for_non_bad_heap_word_value(HeapWord* addr, size_t size) { |
0 | 108 if (CheckMemoryInitialization && ZapUnusedHeapArea) { |
109 for (size_t slot = 0; slot < size; slot += 1) { | |
110 assert((*(intptr_t*) (addr + slot)) == ((intptr_t) badHeapWordVal), | |
111 "Found non badHeapWordValue in pre-allocation check"); | |
112 } | |
113 } | |
114 } | |
115 #endif // PRODUCT | |
116 | |
117 #ifdef ASSERT | |
118 void CollectedHeap::check_for_valid_allocation_state() { | |
119 Thread *thread = Thread::current(); | |
120 // How to choose between a pending exception and a potential | |
121 // OutOfMemoryError? Don't allow pending exceptions. | |
122 // This is a VM policy failure, so how do we exhaustively test it? | |
123 assert(!thread->has_pending_exception(), | |
124 "shouldn't be allocating with pending exception"); | |
125 if (StrictSafepointChecks) { | |
126 assert(thread->allow_allocation(), | |
127 "Allocation done by thread for which allocation is blocked " | |
128 "by No_Allocation_Verifier!"); | |
129 // Allocation of an oop can always invoke a safepoint, | |
130 // hence, the true argument | |
131 thread->check_for_valid_safepoint_state(true); | |
132 } | |
133 } | |
134 #endif | |
135 | |
136 HeapWord* CollectedHeap::allocate_from_tlab_slow(Thread* thread, size_t size) { | |
137 | |
138 // Retain tlab and allocate object in shared space if | |
139 // the amount free in the tlab is too large to discard. | |
140 if (thread->tlab().free() > thread->tlab().refill_waste_limit()) { | |
141 thread->tlab().record_slow_allocation(size); | |
142 return NULL; | |
143 } | |
144 | |
145 // Discard tlab and allocate a new one. | |
146 // To minimize fragmentation, the last TLAB may be smaller than the rest. | |
147 size_t new_tlab_size = thread->tlab().compute_size(size); | |
148 | |
149 thread->tlab().clear_before_allocation(); | |
150 | |
151 if (new_tlab_size == 0) { | |
152 return NULL; | |
153 } | |
154 | |
155 // Allocate a new TLAB... | |
156 HeapWord* obj = Universe::heap()->allocate_new_tlab(new_tlab_size); | |
157 if (obj == NULL) { | |
158 return NULL; | |
159 } | |
160 if (ZeroTLAB) { | |
161 // ..and clear it. | |
162 Copy::zero_to_words(obj, new_tlab_size); | |
163 } else { | |
3892 | 164 // ...and zap just allocated object. |
165 #ifdef ASSERT | |
166 // Skip mangling the space corresponding to the object header to | |
167 // ensure that the returned space is not considered parsable by | |
168 // any concurrent GC thread. | |
169 size_t hdr_size = oopDesc::header_size(); | |
170 Copy::fill_to_words(obj + hdr_size, new_tlab_size - hdr_size, badHeapWordVal); | |
171 #endif // ASSERT | |
0 | 172 } |
173 thread->tlab().fill(obj, obj + size, new_tlab_size); | |
174 return obj; | |
175 } | |
176 | |
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177 void CollectedHeap::flush_deferred_store_barrier(JavaThread* thread) { |
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178 MemRegion deferred = thread->deferred_card_mark(); |
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179 if (!deferred.is_empty()) { |
1166 | 180 assert(_defer_initial_card_mark, "Otherwise should be empty"); |
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181 { |
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182 // Verify that the storage points to a parsable object in heap |
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183 DEBUG_ONLY(oop old_obj = oop(deferred.start());) |
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184 assert(is_in(old_obj), "Not in allocated heap"); |
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185 assert(!can_elide_initializing_store_barrier(old_obj), |
1166 | 186 "Else should have been filtered in new_store_pre_barrier()"); |
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187 assert(!is_in_permanent(old_obj), "Sanity: not expected"); |
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188 assert(old_obj->is_oop(true), "Not an oop"); |
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189 assert(old_obj->is_parsable(), "Will not be concurrently parsable"); |
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190 assert(deferred.word_size() == (size_t)(old_obj->size()), |
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191 "Mismatch: multiple objects?"); |
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192 } |
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193 BarrierSet* bs = barrier_set(); |
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194 assert(bs->has_write_region_opt(), "No write_region() on BarrierSet"); |
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195 bs->write_region(deferred); |
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196 // "Clear" the deferred_card_mark field |
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197 thread->set_deferred_card_mark(MemRegion()); |
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198 } |
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199 assert(thread->deferred_card_mark().is_empty(), "invariant"); |
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200 } |
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201 |
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202 // Helper for ReduceInitialCardMarks. For performance, |
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203 // compiled code may elide card-marks for initializing stores |
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204 // to a newly allocated object along the fast-path. We |
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205 // compensate for such elided card-marks as follows: |
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206 // (a) Generational, non-concurrent collectors, such as |
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207 // GenCollectedHeap(ParNew,DefNew,Tenured) and |
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208 // ParallelScavengeHeap(ParallelGC, ParallelOldGC) |
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209 // need the card-mark if and only if the region is |
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210 // in the old gen, and do not care if the card-mark |
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211 // succeeds or precedes the initializing stores themselves, |
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212 // so long as the card-mark is completed before the next |
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213 // scavenge. For all these cases, we can do a card mark |
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214 // at the point at which we do a slow path allocation |
1166 | 215 // in the old gen, i.e. in this call. |
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216 // (b) GenCollectedHeap(ConcurrentMarkSweepGeneration) requires |
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217 // in addition that the card-mark for an old gen allocated |
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218 // object strictly follow any associated initializing stores. |
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219 // In these cases, the memRegion remembered below is |
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220 // used to card-mark the entire region either just before the next |
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221 // slow-path allocation by this thread or just before the next scavenge or |
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222 // CMS-associated safepoint, whichever of these events happens first. |
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223 // (The implicit assumption is that the object has been fully |
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224 // initialized by this point, a fact that we assert when doing the |
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225 // card-mark.) |
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226 // (c) G1CollectedHeap(G1) uses two kinds of write barriers. When a |
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227 // G1 concurrent marking is in progress an SATB (pre-write-)barrier is |
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228 // is used to remember the pre-value of any store. Initializing |
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229 // stores will not need this barrier, so we need not worry about |
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230 // compensating for the missing pre-barrier here. Turning now |
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231 // to the post-barrier, we note that G1 needs a RS update barrier |
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232 // which simply enqueues a (sequence of) dirty cards which may |
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233 // optionally be refined by the concurrent update threads. Note |
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234 // that this barrier need only be applied to a non-young write, |
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235 // but, like in CMS, because of the presence of concurrent refinement |
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236 // (much like CMS' precleaning), must strictly follow the oop-store. |
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237 // Thus, using the same protocol for maintaining the intended |
1166 | 238 // invariants turns out, serendepitously, to be the same for both |
239 // G1 and CMS. | |
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240 // |
1166 | 241 // For any future collector, this code should be reexamined with |
242 // that specific collector in mind, and the documentation above suitably | |
243 // extended and updated. | |
244 oop CollectedHeap::new_store_pre_barrier(JavaThread* thread, oop new_obj) { | |
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245 // If a previous card-mark was deferred, flush it now. |
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246 flush_deferred_store_barrier(thread); |
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247 if (can_elide_initializing_store_barrier(new_obj)) { |
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248 // The deferred_card_mark region should be empty |
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249 // following the flush above. |
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250 assert(thread->deferred_card_mark().is_empty(), "Error"); |
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251 } else { |
1166 | 252 MemRegion mr((HeapWord*)new_obj, new_obj->size()); |
253 assert(!mr.is_empty(), "Error"); | |
254 if (_defer_initial_card_mark) { | |
255 // Defer the card mark | |
256 thread->set_deferred_card_mark(mr); | |
257 } else { | |
258 // Do the card mark | |
259 BarrierSet* bs = barrier_set(); | |
260 assert(bs->has_write_region_opt(), "No write_region() on BarrierSet"); | |
261 bs->write_region(mr); | |
262 } | |
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263 } |
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264 return new_obj; |
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265 } |
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266 |
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267 size_t CollectedHeap::filler_array_hdr_size() { |
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268 return size_t(align_object_offset(arrayOopDesc::header_size(T_INT))); // align to Long |
481
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269 } |
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270 |
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271 size_t CollectedHeap::filler_array_min_size() { |
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272 return align_object_size(filler_array_hdr_size()); // align to MinObjAlignment |
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273 } |
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274 |
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275 size_t CollectedHeap::filler_array_max_size() { |
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276 return _filler_array_max_size; |
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277 } |
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278 |
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279 #ifdef ASSERT |
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280 void CollectedHeap::fill_args_check(HeapWord* start, size_t words) |
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281 { |
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282 assert(words >= min_fill_size(), "too small to fill"); |
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283 assert(words % MinObjAlignment == 0, "unaligned size"); |
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284 assert(Universe::heap()->is_in_reserved(start), "not in heap"); |
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285 assert(Universe::heap()->is_in_reserved(start + words - 1), "not in heap"); |
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286 } |
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287 |
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288 void CollectedHeap::zap_filler_array(HeapWord* start, size_t words, bool zap) |
481
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289 { |
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290 if (ZapFillerObjects && zap) { |
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291 Copy::fill_to_words(start + filler_array_hdr_size(), |
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292 words - filler_array_hdr_size(), 0XDEAFBABE); |
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293 } |
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294 } |
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295 #endif // ASSERT |
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296 |
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297 void |
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298 CollectedHeap::fill_with_array(HeapWord* start, size_t words, bool zap) |
481
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299 { |
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300 assert(words >= filler_array_min_size(), "too small for an array"); |
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301 assert(words <= filler_array_max_size(), "too big for a single object"); |
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302 |
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303 const size_t payload_size = words - filler_array_hdr_size(); |
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304 const size_t len = payload_size * HeapWordSize / sizeof(jint); |
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305 |
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306 // Set the length first for concurrent GC. |
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307 ((arrayOop)start)->set_length((int)len); |
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308 post_allocation_setup_common(Universe::intArrayKlassObj(), start, words); |
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309 DEBUG_ONLY(zap_filler_array(start, words, zap);) |
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310 } |
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311 |
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312 void |
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313 CollectedHeap::fill_with_object_impl(HeapWord* start, size_t words, bool zap) |
481
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314 { |
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315 assert(words <= filler_array_max_size(), "too big for a single object"); |
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316 |
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317 if (words >= filler_array_min_size()) { |
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318 fill_with_array(start, words, zap); |
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319 } else if (words > 0) { |
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320 assert(words == min_fill_size(), "unaligned size"); |
1142 | 321 post_allocation_setup_common(SystemDictionary::Object_klass(), start, |
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322 words); |
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323 } |
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324 } |
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325 |
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326 void CollectedHeap::fill_with_object(HeapWord* start, size_t words, bool zap) |
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327 { |
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328 DEBUG_ONLY(fill_args_check(start, words);) |
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329 HandleMark hm; // Free handles before leaving. |
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330 fill_with_object_impl(start, words, zap); |
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331 } |
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332 |
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333 void CollectedHeap::fill_with_objects(HeapWord* start, size_t words, bool zap) |
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334 { |
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335 DEBUG_ONLY(fill_args_check(start, words);) |
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336 HandleMark hm; // Free handles before leaving. |
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337 |
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338 #ifdef _LP64 |
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339 // A single array can fill ~8G, so multiple objects are needed only in 64-bit. |
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340 // First fill with arrays, ensuring that any remaining space is big enough to |
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341 // fill. The remainder is filled with a single object. |
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342 const size_t min = min_fill_size(); |
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343 const size_t max = filler_array_max_size(); |
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344 while (words > max) { |
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345 const size_t cur = words - max >= min ? max : max - min; |
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346 fill_with_array(start, cur, zap); |
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347 start += cur; |
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348 words -= cur; |
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349 } |
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350 #endif |
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351 |
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352 fill_with_object_impl(start, words, zap); |
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353 } |
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354 |
0 | 355 HeapWord* CollectedHeap::allocate_new_tlab(size_t size) { |
356 guarantee(false, "thread-local allocation buffers not supported"); | |
357 return NULL; | |
358 } | |
359 | |
360 void CollectedHeap::ensure_parsability(bool retire_tlabs) { | |
361 // The second disjunct in the assertion below makes a concession | |
362 // for the start-up verification done while the VM is being | |
363 // created. Callers be careful that you know that mutators | |
364 // aren't going to interfere -- for instance, this is permissible | |
365 // if we are still single-threaded and have either not yet | |
366 // started allocating (nothing much to verify) or we have | |
367 // started allocating but are now a full-fledged JavaThread | |
368 // (and have thus made our TLAB's) available for filling. | |
369 assert(SafepointSynchronize::is_at_safepoint() || | |
370 !is_init_completed(), | |
371 "Should only be called at a safepoint or at start-up" | |
372 " otherwise concurrent mutator activity may make heap " | |
373 " unparsable again"); | |
1166 | 374 const bool use_tlab = UseTLAB; |
375 const bool deferred = _defer_initial_card_mark; | |
376 // The main thread starts allocating via a TLAB even before it | |
377 // has added itself to the threads list at vm boot-up. | |
378 assert(!use_tlab || Threads::first() != NULL, | |
379 "Attempt to fill tlabs before main thread has been added" | |
380 " to threads list is doomed to failure!"); | |
381 for (JavaThread *thread = Threads::first(); thread; thread = thread->next()) { | |
382 if (use_tlab) thread->tlab().make_parsable(retire_tlabs); | |
383 #ifdef COMPILER2 | |
384 // The deferred store barriers must all have been flushed to the | |
385 // card-table (or other remembered set structure) before GC starts | |
386 // processing the card-table (or other remembered set). | |
387 if (deferred) flush_deferred_store_barrier(thread); | |
388 #else | |
389 assert(!deferred, "Should be false"); | |
390 assert(thread->deferred_card_mark().is_empty(), "Should be empty"); | |
391 #endif | |
0 | 392 } |
393 } | |
394 | |
395 void CollectedHeap::accumulate_statistics_all_tlabs() { | |
396 if (UseTLAB) { | |
397 assert(SafepointSynchronize::is_at_safepoint() || | |
398 !is_init_completed(), | |
399 "should only accumulate statistics on tlabs at safepoint"); | |
400 | |
401 ThreadLocalAllocBuffer::accumulate_statistics_before_gc(); | |
402 } | |
403 } | |
404 | |
405 void CollectedHeap::resize_all_tlabs() { | |
406 if (UseTLAB) { | |
407 assert(SafepointSynchronize::is_at_safepoint() || | |
408 !is_init_completed(), | |
409 "should only resize tlabs at safepoint"); | |
410 | |
411 ThreadLocalAllocBuffer::resize_all_tlabs(); | |
412 } | |
413 } | |
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414 |
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415 void CollectedHeap::pre_full_gc_dump() { |
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416 if (HeapDumpBeforeFullGC) { |
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417 TraceTime tt("Heap Dump (before full gc): ", PrintGCDetails, false, gclog_or_tty); |
615
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418 // We are doing a "major" collection and a heap dump before |
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419 // major collection has been requested. |
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420 HeapDumper::dump_heap(); |
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421 } |
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422 if (PrintClassHistogramBeforeFullGC) { |
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423 TraceTime tt("Class Histogram (before full gc): ", PrintGCDetails, true, gclog_or_tty); |
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424 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */, false /* ! prologue */); |
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425 inspector.doit(); |
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426 } |
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427 } |
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428 |
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429 void CollectedHeap::post_full_gc_dump() { |
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430 if (HeapDumpAfterFullGC) { |
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431 TraceTime tt("Heap Dump (after full gc): ", PrintGCDetails, false, gclog_or_tty); |
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432 HeapDumper::dump_heap(); |
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433 } |
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434 if (PrintClassHistogramAfterFullGC) { |
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435 TraceTime tt("Class Histogram (after full gc): ", PrintGCDetails, true, gclog_or_tty); |
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436 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */, false /* ! prologue */); |
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437 inspector.doit(); |
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438 } |
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439 } |
4009 | 440 |
441 oop CollectedHeap::Class_obj_allocate(KlassHandle klass, int size, KlassHandle real_klass, TRAPS) { | |
442 debug_only(check_for_valid_allocation_state()); | |
443 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed"); | |
444 assert(size >= 0, "int won't convert to size_t"); | |
445 HeapWord* obj; | |
446 if (JavaObjectsInPerm) { | |
447 obj = common_permanent_mem_allocate_init(size, CHECK_NULL); | |
448 } else { | |
449 assert(ScavengeRootsInCode > 0, "must be"); | |
450 obj = common_mem_allocate_init(size, CHECK_NULL); | |
451 } | |
452 post_allocation_setup_common(klass, obj, size); | |
453 assert(Universe::is_bootstrapping() || | |
454 !((oop)obj)->blueprint()->oop_is_array(), "must not be an array"); | |
455 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size)); | |
456 oop mirror = (oop)obj; | |
457 | |
458 java_lang_Class::set_oop_size(mirror, size); | |
459 | |
460 // Setup indirections | |
461 if (!real_klass.is_null()) { | |
462 java_lang_Class::set_klass(mirror, real_klass()); | |
463 real_klass->set_java_mirror(mirror); | |
464 } | |
465 | |
466 instanceMirrorKlass* mk = instanceMirrorKlass::cast(mirror->klass()); | |
467 assert(size == mk->instance_size(real_klass), "should have been set"); | |
468 | |
469 // notify jvmti and dtrace | |
470 post_allocation_notify(klass, (oop)obj); | |
471 | |
472 return mirror; | |
473 } | |
4708 | 474 |
475 /////////////// Unit tests /////////////// | |
476 | |
477 #ifndef PRODUCT | |
478 void CollectedHeap::test_is_in() { | |
479 CollectedHeap* heap = Universe::heap(); | |
480 | |
481 // Test that NULL is not in the heap. | |
482 assert(!heap->is_in(NULL), "NULL is unexpectedly in the heap"); | |
483 | |
484 // Test that a pointer to before the heap start is reported as outside the heap. | |
485 assert(heap->_reserved.start() >= (void*)MinObjAlignment, "sanity"); | |
486 void* before_heap = (void*)((intptr_t)heap->_reserved.start() - MinObjAlignment); | |
487 assert(!heap->is_in(before_heap), | |
488 err_msg("before_heap: " PTR_FORMAT " is unexpectedly in the heap", before_heap)); | |
489 | |
490 // Test that a pointer to after the heap end is reported as outside the heap. | |
491 assert(heap->_reserved.end() <= (void*)(uintptr_t(-1) - (uint)MinObjAlignment), "sanity"); | |
492 void* after_heap = (void*)((intptr_t)heap->_reserved.end() + MinObjAlignment); | |
493 assert(!heap->is_in(after_heap), | |
494 err_msg("after_heap: " PTR_FORMAT " is unexpectedly in the heap", after_heap)); | |
495 } | |
496 #endif |