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1 /*
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2 * Copyright 1999-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // ciObjectFactory
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26 //
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27 // This class handles requests for the creation of new instances
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28 // of ciObject and its subclasses. It contains a caching mechanism
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29 // which ensures that for each oop, at most one ciObject is created.
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30 // This invariant allows efficient implementation of ciObject.
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31 class ciObjectFactory : public ResourceObj {
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32 private:
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33 static volatile bool _initialized;
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34 static GrowableArray<ciObject*>* _shared_ci_objects;
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35 static ciSymbol* _shared_ci_symbols[];
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36 static int _shared_ident_limit;
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37
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38 Arena* _arena;
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39 GrowableArray<ciObject*>* _ci_objects;
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40 GrowableArray<ciMethod*>* _unloaded_methods;
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41 GrowableArray<ciKlass*>* _unloaded_klasses;
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42 GrowableArray<ciReturnAddress*>* _return_addresses;
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43 int _next_ident;
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44
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45 public:
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46 struct NonPermObject : public ResourceObj {
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47 ciObject* _object;
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48 NonPermObject* _next;
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49
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50 inline NonPermObject(NonPermObject* &bucket, oop key, ciObject* object);
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51 ciObject* object() { return _object; }
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52 NonPermObject* &next() { return _next; }
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53 };
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54 private:
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55 enum { NON_PERM_BUCKETS = 61 };
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56 NonPermObject* _non_perm_bucket[NON_PERM_BUCKETS];
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57 int _non_perm_count;
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58
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59 int find(oop key, GrowableArray<ciObject*>* objects);
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60 bool is_found_at(int index, oop key, GrowableArray<ciObject*>* objects);
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61 void insert(int index, ciObject* obj, GrowableArray<ciObject*>* objects);
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62 ciObject* create_new_object(oop o);
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63 static bool is_equal(NonPermObject* p, oop key) {
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64 return p->object()->get_oop() == key;
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65 }
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66
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67 NonPermObject* &find_non_perm(oop key);
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68 void insert_non_perm(NonPermObject* &where, oop key, ciObject* obj);
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69
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70 void init_ident_of(ciObject* obj);
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71
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72 Arena* arena() { return _arena; }
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73
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74 void print_contents_impl();
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75
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76 public:
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77 static bool is_initialized() { return _initialized; }
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78
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79 static void initialize();
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80 void init_shared_objects();
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81
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82 ciObjectFactory(Arena* arena, int expected_size);
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83
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84
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85 // Get the ciObject corresponding to some oop.
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86 ciObject* get(oop key);
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87
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88 // Get the ciSymbol corresponding to one of the vmSymbols.
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89 static ciSymbol* vm_symbol_at(int index);
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90
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91 // Get the ciMethod representing an unloaded/unfound method.
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92 ciMethod* get_unloaded_method(ciInstanceKlass* holder,
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93 ciSymbol* name,
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94 ciSymbol* signature);
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95
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96 // Get a ciKlass representing an unloaded klass.
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97 ciKlass* get_unloaded_klass(ciKlass* accessing_klass,
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98 ciSymbol* name,
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99 bool create_if_not_found);
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100
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101
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102 // Get the ciMethodData representing the methodData for a method
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103 // with none.
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104 ciMethodData* get_empty_methodData();
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105
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106 ciReturnAddress* get_return_address(int bci);
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107
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108 void print_contents();
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109 void print();
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110 };
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