Mercurial > hg > graal-compiler

annotate src/share/vm/memory/permGen.hpp @ 1941:79d04223b8a5

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Added caching for resolved types and resolved fields. This is crucial, because the local load elimination will lead to wrong results, if field equality (of two RiField objects with the same object and the same RiType) is not given. The caching makes sure that the default equals implementation is sufficient.
author Thomas Wuerthinger <wuerthinger@ssw.jku.at>
date Tue, 28 Dec 2010 18:33:26 +0100
parents e41cd7fd68a6
children f95d63e2154a
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1 /*
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2 * Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 // All heaps contains a "permanent generation," containing permanent
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26 // (reflective) objects. This is like a regular generation in some ways,
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27 // but unlike one in others, and so is split apart.
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28
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29 class Generation;
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30 class GenRemSet;
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31 class CSpaceCounters;
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32
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33 // PermGen models the part of the heap used to allocate class meta-data.
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35 class PermGen : public CHeapObj {
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36 friend class VMStructs;
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37 protected:
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38 size_t _capacity_expansion_limit; // maximum expansion allowed without a
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39 // full gc occurring
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40 void set_capacity_expansion_limit(size_t limit) {
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41 assert_locked_or_safepoint(Heap_lock);
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42 _capacity_expansion_limit = limit;
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43 }
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44
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45 HeapWord* mem_allocate_in_gen(size_t size, Generation* gen);
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46 // Along with mem_allocate_in_gen() above, implements policy for
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47 // "scheduling" allocation/expansion/collection of the perm gen.
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48 // The virtual method request_...() below can be overridden by
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49 // subtypes that want to implement a different expansion/collection
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50 // policy from the default provided.
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51 virtual HeapWord* request_expand_and_allocate(Generation* gen, size_t size,
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52 GCCause::Cause prev_cause);
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53
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54 public:
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55 enum Name {
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56 MarkSweepCompact, MarkSweep, ConcurrentMarkSweep
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57 };
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58
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59 // Permanent allocation (initialized)
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60 virtual HeapWord* mem_allocate(size_t size) = 0;
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61
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62 // Mark sweep support
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63 virtual void compute_new_size() = 0;
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64
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65 // Ideally, we would use MI (IMHO) but we'll do delegation instead.
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66 virtual Generation* as_gen() const = 0;
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67
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68 virtual void oop_iterate(OopClosure* cl) {
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69 Generation* g = as_gen();
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70 assert(g != NULL, "as_gen() NULL");
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71 g->oop_iterate(cl);
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72 }
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74 virtual void object_iterate(ObjectClosure* cl) {
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75 Generation* g = as_gen();
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76 assert(g != NULL, "as_gen() NULL");
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77 g->object_iterate(cl);
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78 }
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79
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80 // Performance Counter support
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81 virtual void update_counters() {
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82 Generation* g = as_gen();
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83 assert(g != NULL, "as_gen() NULL");
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84 g->update_counters();
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85 }
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86 };