Mercurial > hg > truffle
annotate src/share/vm/gc_interface/collectedHeap.cpp @ 7666:31540ca73e81
Remove ControlFlowException in SimpleLanguage.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Fri, 01 Feb 2013 19:53:52 +0100 |
parents | f34d701e952e |
children | f2110083203d |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2012, 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" |
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33 #include "runtime/thread.inline.hpp" |
1972 | 34 #include "services/heapDumper.hpp" |
0 | 35 |
36 | |
37 #ifdef ASSERT | |
38 int CollectedHeap::_fire_out_of_memory_count = 0; | |
39 #endif | |
40 | |
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41 size_t CollectedHeap::_filler_array_max_size = 0; |
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42 |
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43 template <> |
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44 void EventLogBase<GCMessage>::print(outputStream* st, GCMessage& m) { |
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45 st->print_cr("GC heap %s", m.is_before ? "before" : "after"); |
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46 st->print_raw(m); |
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47 } |
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48 |
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49 void GCHeapLog::log_heap(bool before) { |
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50 if (!should_log()) { |
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51 return; |
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52 } |
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53 |
4944 | 54 double timestamp = fetch_timestamp(); |
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55 MutexLockerEx ml(&_mutex, Mutex::_no_safepoint_check_flag); |
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56 int index = compute_log_index(); |
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57 _records[index].thread = NULL; // Its the GC thread so it's not that interesting. |
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58 _records[index].timestamp = timestamp; |
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59 _records[index].data.is_before = before; |
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60 stringStream st(_records[index].data.buffer(), _records[index].data.size()); |
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61 if (before) { |
4944 | 62 Universe::print_heap_before_gc(&st, true); |
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63 } else { |
4944 | 64 Universe::print_heap_after_gc(&st, true); |
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65 } |
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66 } |
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67 |
0 | 68 // Memory state functions. |
69 | |
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70 |
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71 CollectedHeap::CollectedHeap() : _n_par_threads(0) |
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72 |
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73 { |
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74 const size_t max_len = size_t(arrayOopDesc::max_array_length(T_INT)); |
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75 const size_t elements_per_word = HeapWordSize / sizeof(jint); |
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76 _filler_array_max_size = align_object_size(filler_array_hdr_size() + |
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77 max_len / elements_per_word); |
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78 |
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79 _barrier_set = NULL; |
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80 _is_gc_active = false; |
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81 _total_collections = _total_full_collections = 0; |
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82 _gc_cause = _gc_lastcause = GCCause::_no_gc; |
0 | 83 NOT_PRODUCT(_promotion_failure_alot_count = 0;) |
84 NOT_PRODUCT(_promotion_failure_alot_gc_number = 0;) | |
85 | |
86 if (UsePerfData) { | |
87 EXCEPTION_MARK; | |
88 | |
89 // create the gc cause jvmstat counters | |
90 _perf_gc_cause = PerfDataManager::create_string_variable(SUN_GC, "cause", | |
91 80, GCCause::to_string(_gc_cause), CHECK); | |
92 | |
93 _perf_gc_lastcause = | |
94 PerfDataManager::create_string_variable(SUN_GC, "lastCause", | |
95 80, GCCause::to_string(_gc_lastcause), CHECK); | |
96 } | |
1166 | 97 _defer_initial_card_mark = false; // strengthened by subclass in pre_initialize() below. |
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98 // Create the ring log |
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99 if (LogEvents) { |
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100 _gc_heap_log = new GCHeapLog(); |
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101 } else { |
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102 _gc_heap_log = NULL; |
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103 } |
0 | 104 } |
105 | |
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106 // This interface assumes that it's being called by the |
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107 // vm thread. It collects the heap assuming that the |
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108 // heap lock is already held and that we are executing in |
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109 // the context of the vm thread. |
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110 void CollectedHeap::collect_as_vm_thread(GCCause::Cause cause) { |
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111 assert(Thread::current()->is_VM_thread(), "Precondition#1"); |
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112 assert(Heap_lock->is_locked(), "Precondition#2"); |
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113 GCCauseSetter gcs(this, cause); |
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114 switch (cause) { |
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115 case GCCause::_heap_inspection: |
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116 case GCCause::_heap_dump: |
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117 case GCCause::_metadata_GC_threshold : { |
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118 HandleMark hm; |
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119 do_full_collection(false); // don't clear all soft refs |
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120 break; |
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121 } |
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122 case GCCause::_last_ditch_collection: { |
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123 HandleMark hm; |
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124 do_full_collection(true); // do clear all soft refs |
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125 break; |
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126 } |
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127 default: |
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128 ShouldNotReachHere(); // Unexpected use of this function |
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129 } |
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130 } |
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131 MetaWord* CollectedHeap::satisfy_failed_metadata_allocation( |
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132 ClassLoaderData* loader_data, |
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133 size_t size, Metaspace::MetadataType mdtype) { |
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134 return collector_policy()->satisfy_failed_metadata_allocation(loader_data, size, mdtype); |
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135 } |
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136 |
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137 |
1166 | 138 void CollectedHeap::pre_initialize() { |
139 // Used for ReduceInitialCardMarks (when COMPILER2 is used); | |
140 // otherwise remains unused. | |
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141 #ifdef COMPILER2 |
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142 _defer_initial_card_mark = ReduceInitialCardMarks && can_elide_tlab_store_barriers() |
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143 && (DeferInitialCardMark || card_mark_must_follow_store()); |
1166 | 144 #else |
145 assert(_defer_initial_card_mark == false, "Who would set it?"); | |
146 #endif | |
147 } | |
0 | 148 |
149 #ifndef PRODUCT | |
150 void CollectedHeap::check_for_bad_heap_word_value(HeapWord* addr, size_t size) { | |
151 if (CheckMemoryInitialization && ZapUnusedHeapArea) { | |
152 for (size_t slot = 0; slot < size; slot += 1) { | |
153 assert((*(intptr_t*) (addr + slot)) != ((intptr_t) badHeapWordVal), | |
154 "Found badHeapWordValue in post-allocation check"); | |
155 } | |
156 } | |
157 } | |
158 | |
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159 void CollectedHeap::check_for_non_bad_heap_word_value(HeapWord* addr, size_t size) { |
0 | 160 if (CheckMemoryInitialization && ZapUnusedHeapArea) { |
161 for (size_t slot = 0; slot < size; slot += 1) { | |
162 assert((*(intptr_t*) (addr + slot)) == ((intptr_t) badHeapWordVal), | |
163 "Found non badHeapWordValue in pre-allocation check"); | |
164 } | |
165 } | |
166 } | |
167 #endif // PRODUCT | |
168 | |
169 #ifdef ASSERT | |
170 void CollectedHeap::check_for_valid_allocation_state() { | |
171 Thread *thread = Thread::current(); | |
172 // How to choose between a pending exception and a potential | |
173 // OutOfMemoryError? Don't allow pending exceptions. | |
174 // This is a VM policy failure, so how do we exhaustively test it? | |
175 assert(!thread->has_pending_exception(), | |
176 "shouldn't be allocating with pending exception"); | |
177 if (StrictSafepointChecks) { | |
178 assert(thread->allow_allocation(), | |
179 "Allocation done by thread for which allocation is blocked " | |
180 "by No_Allocation_Verifier!"); | |
181 // Allocation of an oop can always invoke a safepoint, | |
182 // hence, the true argument | |
183 thread->check_for_valid_safepoint_state(true); | |
184 } | |
185 } | |
186 #endif | |
187 | |
188 HeapWord* CollectedHeap::allocate_from_tlab_slow(Thread* thread, size_t size) { | |
189 | |
190 // Retain tlab and allocate object in shared space if | |
191 // the amount free in the tlab is too large to discard. | |
192 if (thread->tlab().free() > thread->tlab().refill_waste_limit()) { | |
193 thread->tlab().record_slow_allocation(size); | |
194 return NULL; | |
195 } | |
196 | |
197 // Discard tlab and allocate a new one. | |
198 // To minimize fragmentation, the last TLAB may be smaller than the rest. | |
199 size_t new_tlab_size = thread->tlab().compute_size(size); | |
200 | |
201 thread->tlab().clear_before_allocation(); | |
202 | |
203 if (new_tlab_size == 0) { | |
204 return NULL; | |
205 } | |
206 | |
207 // Allocate a new TLAB... | |
208 HeapWord* obj = Universe::heap()->allocate_new_tlab(new_tlab_size); | |
209 if (obj == NULL) { | |
210 return NULL; | |
211 } | |
212 if (ZeroTLAB) { | |
213 // ..and clear it. | |
214 Copy::zero_to_words(obj, new_tlab_size); | |
215 } else { | |
3892 | 216 // ...and zap just allocated object. |
217 #ifdef ASSERT | |
218 // Skip mangling the space corresponding to the object header to | |
219 // ensure that the returned space is not considered parsable by | |
220 // any concurrent GC thread. | |
221 size_t hdr_size = oopDesc::header_size(); | |
222 Copy::fill_to_words(obj + hdr_size, new_tlab_size - hdr_size, badHeapWordVal); | |
223 #endif // ASSERT | |
0 | 224 } |
225 thread->tlab().fill(obj, obj + size, new_tlab_size); | |
226 return obj; | |
227 } | |
228 | |
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229 void CollectedHeap::flush_deferred_store_barrier(JavaThread* thread) { |
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230 MemRegion deferred = thread->deferred_card_mark(); |
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231 if (!deferred.is_empty()) { |
1166 | 232 assert(_defer_initial_card_mark, "Otherwise should be empty"); |
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233 { |
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234 // Verify that the storage points to a parsable object in heap |
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235 DEBUG_ONLY(oop old_obj = oop(deferred.start());) |
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236 assert(is_in(old_obj), "Not in allocated heap"); |
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237 assert(!can_elide_initializing_store_barrier(old_obj), |
1166 | 238 "Else should have been filtered in new_store_pre_barrier()"); |
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239 assert(old_obj->is_oop(true), "Not an oop"); |
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240 assert(deferred.word_size() == (size_t)(old_obj->size()), |
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241 "Mismatch: multiple objects?"); |
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242 } |
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243 BarrierSet* bs = barrier_set(); |
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244 assert(bs->has_write_region_opt(), "No write_region() on BarrierSet"); |
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245 bs->write_region(deferred); |
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246 // "Clear" the deferred_card_mark field |
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247 thread->set_deferred_card_mark(MemRegion()); |
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248 } |
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249 assert(thread->deferred_card_mark().is_empty(), "invariant"); |
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250 } |
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251 |
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252 // Helper for ReduceInitialCardMarks. For performance, |
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253 // compiled code may elide card-marks for initializing stores |
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254 // to a newly allocated object along the fast-path. We |
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255 // compensate for such elided card-marks as follows: |
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256 // (a) Generational, non-concurrent collectors, such as |
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257 // GenCollectedHeap(ParNew,DefNew,Tenured) and |
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258 // ParallelScavengeHeap(ParallelGC, ParallelOldGC) |
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259 // need the card-mark if and only if the region is |
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260 // in the old gen, and do not care if the card-mark |
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261 // succeeds or precedes the initializing stores themselves, |
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262 // so long as the card-mark is completed before the next |
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263 // scavenge. For all these cases, we can do a card mark |
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264 // at the point at which we do a slow path allocation |
1166 | 265 // in the old gen, i.e. in this call. |
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266 // (b) GenCollectedHeap(ConcurrentMarkSweepGeneration) requires |
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267 // in addition that the card-mark for an old gen allocated |
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268 // object strictly follow any associated initializing stores. |
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269 // In these cases, the memRegion remembered below is |
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270 // used to card-mark the entire region either just before the next |
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271 // slow-path allocation by this thread or just before the next scavenge or |
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272 // CMS-associated safepoint, whichever of these events happens first. |
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273 // (The implicit assumption is that the object has been fully |
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274 // initialized by this point, a fact that we assert when doing the |
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275 // card-mark.) |
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276 // (c) G1CollectedHeap(G1) uses two kinds of write barriers. When a |
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277 // G1 concurrent marking is in progress an SATB (pre-write-)barrier is |
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278 // is used to remember the pre-value of any store. Initializing |
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279 // stores will not need this barrier, so we need not worry about |
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280 // compensating for the missing pre-barrier here. Turning now |
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281 // to the post-barrier, we note that G1 needs a RS update barrier |
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282 // which simply enqueues a (sequence of) dirty cards which may |
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283 // optionally be refined by the concurrent update threads. Note |
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284 // that this barrier need only be applied to a non-young write, |
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285 // but, like in CMS, because of the presence of concurrent refinement |
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286 // (much like CMS' precleaning), must strictly follow the oop-store. |
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287 // Thus, using the same protocol for maintaining the intended |
1166 | 288 // invariants turns out, serendepitously, to be the same for both |
289 // G1 and CMS. | |
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290 // |
1166 | 291 // For any future collector, this code should be reexamined with |
292 // that specific collector in mind, and the documentation above suitably | |
293 // extended and updated. | |
294 oop CollectedHeap::new_store_pre_barrier(JavaThread* thread, oop new_obj) { | |
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295 // If a previous card-mark was deferred, flush it now. |
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296 flush_deferred_store_barrier(thread); |
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297 if (can_elide_initializing_store_barrier(new_obj)) { |
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298 // The deferred_card_mark region should be empty |
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299 // following the flush above. |
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300 assert(thread->deferred_card_mark().is_empty(), "Error"); |
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301 } else { |
1166 | 302 MemRegion mr((HeapWord*)new_obj, new_obj->size()); |
303 assert(!mr.is_empty(), "Error"); | |
304 if (_defer_initial_card_mark) { | |
305 // Defer the card mark | |
306 thread->set_deferred_card_mark(mr); | |
307 } else { | |
308 // Do the card mark | |
309 BarrierSet* bs = barrier_set(); | |
310 assert(bs->has_write_region_opt(), "No write_region() on BarrierSet"); | |
311 bs->write_region(mr); | |
312 } | |
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313 } |
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314 return new_obj; |
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315 } |
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316 |
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317 size_t CollectedHeap::filler_array_hdr_size() { |
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318 return size_t(align_object_offset(arrayOopDesc::header_size(T_INT))); // align to Long |
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319 } |
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320 |
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321 size_t CollectedHeap::filler_array_min_size() { |
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322 return align_object_size(filler_array_hdr_size()); // align to MinObjAlignment |
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323 } |
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324 |
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325 #ifdef ASSERT |
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326 void CollectedHeap::fill_args_check(HeapWord* start, size_t words) |
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327 { |
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328 assert(words >= min_fill_size(), "too small to fill"); |
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329 assert(words % MinObjAlignment == 0, "unaligned size"); |
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330 assert(Universe::heap()->is_in_reserved(start), "not in heap"); |
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331 assert(Universe::heap()->is_in_reserved(start + words - 1), "not in heap"); |
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332 } |
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333 |
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334 void CollectedHeap::zap_filler_array(HeapWord* start, size_t words, bool zap) |
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335 { |
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336 if (ZapFillerObjects && zap) { |
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337 Copy::fill_to_words(start + filler_array_hdr_size(), |
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338 words - filler_array_hdr_size(), 0XDEAFBABE); |
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339 } |
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340 } |
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341 #endif // ASSERT |
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342 |
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343 void |
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344 CollectedHeap::fill_with_array(HeapWord* start, size_t words, bool zap) |
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345 { |
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346 assert(words >= filler_array_min_size(), "too small for an array"); |
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347 assert(words <= filler_array_max_size(), "too big for a single object"); |
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348 |
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349 const size_t payload_size = words - filler_array_hdr_size(); |
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350 const size_t len = payload_size * HeapWordSize / sizeof(jint); |
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351 assert((int)len >= 0, err_msg("size too large " SIZE_FORMAT " becomes %d", words, (int)len)); |
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352 |
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353 // Set the length first for concurrent GC. |
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354 ((arrayOop)start)->set_length((int)len); |
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355 post_allocation_setup_common(Universe::intArrayKlassObj(), start); |
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356 DEBUG_ONLY(zap_filler_array(start, words, zap);) |
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357 } |
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358 |
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359 void |
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360 CollectedHeap::fill_with_object_impl(HeapWord* start, size_t words, bool zap) |
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361 { |
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362 assert(words <= filler_array_max_size(), "too big for a single object"); |
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363 |
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364 if (words >= filler_array_min_size()) { |
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365 fill_with_array(start, words, zap); |
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366 } else if (words > 0) { |
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367 assert(words == min_fill_size(), "unaligned size"); |
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368 post_allocation_setup_common(SystemDictionary::Object_klass(), start); |
481
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369 } |
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370 } |
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371 |
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372 void CollectedHeap::fill_with_object(HeapWord* start, size_t words, bool zap) |
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373 { |
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374 DEBUG_ONLY(fill_args_check(start, words);) |
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375 HandleMark hm; // Free handles before leaving. |
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376 fill_with_object_impl(start, words, zap); |
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377 } |
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378 |
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379 void CollectedHeap::fill_with_objects(HeapWord* start, size_t words, bool zap) |
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380 { |
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381 DEBUG_ONLY(fill_args_check(start, words);) |
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382 HandleMark hm; // Free handles before leaving. |
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383 |
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384 #ifdef _LP64 |
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385 // A single array can fill ~8G, so multiple objects are needed only in 64-bit. |
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386 // First fill with arrays, ensuring that any remaining space is big enough to |
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387 // fill. The remainder is filled with a single object. |
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388 const size_t min = min_fill_size(); |
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389 const size_t max = filler_array_max_size(); |
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390 while (words > max) { |
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391 const size_t cur = words - max >= min ? max : max - min; |
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392 fill_with_array(start, cur, zap); |
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393 start += cur; |
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394 words -= cur; |
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395 } |
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396 #endif |
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397 |
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398 fill_with_object_impl(start, words, zap); |
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399 } |
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400 |
0 | 401 HeapWord* CollectedHeap::allocate_new_tlab(size_t size) { |
402 guarantee(false, "thread-local allocation buffers not supported"); | |
403 return NULL; | |
404 } | |
405 | |
406 void CollectedHeap::ensure_parsability(bool retire_tlabs) { | |
407 // The second disjunct in the assertion below makes a concession | |
408 // for the start-up verification done while the VM is being | |
409 // created. Callers be careful that you know that mutators | |
410 // aren't going to interfere -- for instance, this is permissible | |
411 // if we are still single-threaded and have either not yet | |
412 // started allocating (nothing much to verify) or we have | |
413 // started allocating but are now a full-fledged JavaThread | |
414 // (and have thus made our TLAB's) available for filling. | |
415 assert(SafepointSynchronize::is_at_safepoint() || | |
416 !is_init_completed(), | |
417 "Should only be called at a safepoint or at start-up" | |
418 " otherwise concurrent mutator activity may make heap " | |
419 " unparsable again"); | |
1166 | 420 const bool use_tlab = UseTLAB; |
421 const bool deferred = _defer_initial_card_mark; | |
422 // The main thread starts allocating via a TLAB even before it | |
423 // has added itself to the threads list at vm boot-up. | |
424 assert(!use_tlab || Threads::first() != NULL, | |
425 "Attempt to fill tlabs before main thread has been added" | |
426 " to threads list is doomed to failure!"); | |
427 for (JavaThread *thread = Threads::first(); thread; thread = thread->next()) { | |
428 if (use_tlab) thread->tlab().make_parsable(retire_tlabs); | |
429 #ifdef COMPILER2 | |
430 // The deferred store barriers must all have been flushed to the | |
431 // card-table (or other remembered set structure) before GC starts | |
432 // processing the card-table (or other remembered set). | |
433 if (deferred) flush_deferred_store_barrier(thread); | |
434 #else | |
435 assert(!deferred, "Should be false"); | |
436 assert(thread->deferred_card_mark().is_empty(), "Should be empty"); | |
437 #endif | |
0 | 438 } |
439 } | |
440 | |
441 void CollectedHeap::accumulate_statistics_all_tlabs() { | |
442 if (UseTLAB) { | |
443 assert(SafepointSynchronize::is_at_safepoint() || | |
444 !is_init_completed(), | |
445 "should only accumulate statistics on tlabs at safepoint"); | |
446 | |
447 ThreadLocalAllocBuffer::accumulate_statistics_before_gc(); | |
448 } | |
449 } | |
450 | |
451 void CollectedHeap::resize_all_tlabs() { | |
452 if (UseTLAB) { | |
453 assert(SafepointSynchronize::is_at_safepoint() || | |
454 !is_init_completed(), | |
455 "should only resize tlabs at safepoint"); | |
456 | |
457 ThreadLocalAllocBuffer::resize_all_tlabs(); | |
458 } | |
459 } | |
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460 |
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461 void CollectedHeap::pre_full_gc_dump() { |
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462 if (HeapDumpBeforeFullGC) { |
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463 TraceTime tt("Heap Dump (before full gc): ", PrintGCDetails, false, gclog_or_tty); |
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464 // We are doing a "major" collection and a heap dump before |
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465 // major collection has been requested. |
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466 HeapDumper::dump_heap(); |
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467 } |
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468 if (PrintClassHistogramBeforeFullGC) { |
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469 TraceTime tt("Class Histogram (before full gc): ", PrintGCDetails, true, gclog_or_tty); |
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470 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */, false /* ! prologue */); |
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471 inspector.doit(); |
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472 } |
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473 } |
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474 |
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475 void CollectedHeap::post_full_gc_dump() { |
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476 if (HeapDumpAfterFullGC) { |
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477 TraceTime tt("Heap Dump (after full gc): ", PrintGCDetails, false, gclog_or_tty); |
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478 HeapDumper::dump_heap(); |
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479 } |
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480 if (PrintClassHistogramAfterFullGC) { |
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481 TraceTime tt("Class Histogram (after full gc): ", PrintGCDetails, true, gclog_or_tty); |
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482 VM_GC_HeapInspection inspector(gclog_or_tty, false /* ! full gc */, false /* ! prologue */); |
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483 inspector.doit(); |
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484 } |
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485 } |
4009 | 486 |
487 oop CollectedHeap::Class_obj_allocate(KlassHandle klass, int size, KlassHandle real_klass, TRAPS) { | |
488 debug_only(check_for_valid_allocation_state()); | |
489 assert(!Universe::heap()->is_gc_active(), "Allocation during gc not allowed"); | |
490 assert(size >= 0, "int won't convert to size_t"); | |
491 HeapWord* obj; | |
492 assert(ScavengeRootsInCode > 0, "must be"); | |
493 obj = common_mem_allocate_init(size, CHECK_NULL); | |
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494 post_allocation_setup_common(klass, obj); |
4009 | 495 assert(Universe::is_bootstrapping() || |
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496 !((oop)obj)->is_array(), "must not be an array"); |
4009 | 497 NOT_PRODUCT(Universe::heap()->check_for_bad_heap_word_value(obj, size)); |
498 oop mirror = (oop)obj; | |
499 | |
500 java_lang_Class::set_oop_size(mirror, size); | |
501 | |
502 // Setup indirections | |
503 if (!real_klass.is_null()) { | |
504 java_lang_Class::set_klass(mirror, real_klass()); | |
505 real_klass->set_java_mirror(mirror); | |
506 } | |
507 | |
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508 InstanceMirrorKlass* mk = InstanceMirrorKlass::cast(mirror->klass()); |
4009 | 509 assert(size == mk->instance_size(real_klass), "should have been set"); |
510 | |
511 // notify jvmti and dtrace | |
512 post_allocation_notify(klass, (oop)obj); | |
513 | |
514 return mirror; | |
515 } | |
4708 | 516 |
517 /////////////// Unit tests /////////////// | |
518 | |
519 #ifndef PRODUCT | |
520 void CollectedHeap::test_is_in() { | |
521 CollectedHeap* heap = Universe::heap(); | |
522 | |
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523 uintptr_t epsilon = (uintptr_t) MinObjAlignment; |
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524 uintptr_t heap_start = (uintptr_t) heap->_reserved.start(); |
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525 uintptr_t heap_end = (uintptr_t) heap->_reserved.end(); |
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526 |
4708 | 527 // Test that NULL is not in the heap. |
528 assert(!heap->is_in(NULL), "NULL is unexpectedly in the heap"); | |
529 | |
530 // Test that a pointer to before the heap start is reported as outside the heap. | |
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531 assert(heap_start >= ((uintptr_t)NULL + epsilon), "sanity"); |
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532 void* before_heap = (void*)(heap_start - epsilon); |
4708 | 533 assert(!heap->is_in(before_heap), |
534 err_msg("before_heap: " PTR_FORMAT " is unexpectedly in the heap", before_heap)); | |
535 | |
536 // Test that a pointer to after the heap end is reported as outside the heap. | |
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537 assert(heap_end <= ((uintptr_t)-1 - epsilon), "sanity"); |
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538 void* after_heap = (void*)(heap_end + epsilon); |
4708 | 539 assert(!heap->is_in(after_heap), |
540 err_msg("after_heap: " PTR_FORMAT " is unexpectedly in the heap", after_heap)); | |
541 } | |
542 #endif |