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1 /*
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2 * Copyright 1997-2005 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 // A fieldDescriptor describes the attributes of a single field (instance or class variable).
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26 // It needs the class constant pool to work (because it only holds indices into the pool
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27 // rather than the actual info).
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28
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29 class fieldDescriptor VALUE_OBJ_CLASS_SPEC {
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30 private:
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31 AccessFlags _access_flags;
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32 int _name_index;
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33 int _signature_index;
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34 int _initial_value_index;
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35 int _offset;
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36 int _generic_signature_index;
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37 int _index; // index into fields() array
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38 constantPoolHandle _cp;
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39
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40 public:
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41 symbolOop name() const { return _cp->symbol_at(_name_index); }
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42 symbolOop signature() const { return _cp->symbol_at(_signature_index); }
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43 klassOop field_holder() const { return _cp->pool_holder(); }
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44 constantPoolOop constants() const { return _cp(); }
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45 AccessFlags access_flags() const { return _access_flags; }
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46 oop loader() const;
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47 // Offset (in words) of field from start of instanceOop / klassOop
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48 int offset() const { return _offset; }
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49 symbolOop generic_signature() const { return (_generic_signature_index > 0 ? _cp->symbol_at(_generic_signature_index) : (symbolOop)NULL); }
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50 int index() const { return _index; }
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51 typeArrayOop annotations() const;
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52
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53 // Initial field value
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54 bool has_initial_value() const { return _initial_value_index != 0; }
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55 constantTag initial_value_tag() const; // The tag will return true on one of is_int(), is_long(), is_single(), is_double()
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56 jint int_initial_value() const;
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57 jlong long_initial_value() const;
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58 jfloat float_initial_value() const;
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59 jdouble double_initial_value() const;
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60 oop string_initial_value(TRAPS) const;
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61
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62 // Field signature type
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63 BasicType field_type() const { return FieldType::basic_type(signature()); }
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64
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65 // Access flags
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66 bool is_public() const { return _access_flags.is_public(); }
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67 bool is_private() const { return _access_flags.is_private(); }
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68 bool is_protected() const { return _access_flags.is_protected(); }
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69 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); }
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70
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71 bool is_static() const { return _access_flags.is_static(); }
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72 bool is_final() const { return _access_flags.is_final(); }
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73 bool is_volatile() const { return _access_flags.is_volatile(); }
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74 bool is_transient() const { return _access_flags.is_transient(); }
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75
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76 bool is_synthetic() const { return _access_flags.is_synthetic(); }
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77
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78 bool is_field_access_watched() const { return _access_flags.is_field_access_watched(); }
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79 bool is_field_modification_watched() const
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80 { return _access_flags.is_field_modification_watched(); }
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81 void set_is_field_access_watched(const bool value)
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82 { _access_flags.set_is_field_access_watched(value); }
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83 void set_is_field_modification_watched(const bool value)
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84 { _access_flags.set_is_field_modification_watched(value); }
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85
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86 // Initialization
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87 void initialize(klassOop k, int index);
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88
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89 // Print
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90 void print_on(outputStream* st) const PRODUCT_RETURN;
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91 void print_on_for(outputStream* st, oop obj) PRODUCT_RETURN;
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92 };
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