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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 // constant tags in Java .class files
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26
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27
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28 enum {
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29 // See jvm.h for shared JVM_CONSTANT_XXX tags
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30 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/utilities/ConstantTag.java
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31 // Hotspot specific tags
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32 JVM_CONSTANT_Invalid = 0, // For bad value initialization
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33 JVM_CONSTANT_InternalMin = 100, // First implementation tag (aside from bad value of course)
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34 JVM_CONSTANT_UnresolvedClass = 100, // Temporary tag until actual use
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35 JVM_CONSTANT_ClassIndex = 101, // Temporary tag while constructing constant pool
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36 JVM_CONSTANT_UnresolvedString = 102, // Temporary tag until actual use
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37 JVM_CONSTANT_StringIndex = 103, // Temporary tag while constructing constant pool
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38 JVM_CONSTANT_UnresolvedClassInError = 104, // Error tag due to resolution error
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39 JVM_CONSTANT_InternalMax = 104 // Last implementation tag
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40 };
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41
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42
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43 class constantTag VALUE_OBJ_CLASS_SPEC {
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44 private:
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45 jbyte _tag;
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46 public:
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47 bool is_klass() const { return _tag == JVM_CONSTANT_Class; }
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48 bool is_field () const { return _tag == JVM_CONSTANT_Fieldref; }
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49 bool is_method() const { return _tag == JVM_CONSTANT_Methodref; }
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50 bool is_interface_method() const { return _tag == JVM_CONSTANT_InterfaceMethodref; }
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51 bool is_string() const { return _tag == JVM_CONSTANT_String; }
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52 bool is_int() const { return _tag == JVM_CONSTANT_Integer; }
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53 bool is_float() const { return _tag == JVM_CONSTANT_Float; }
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54 bool is_long() const { return _tag == JVM_CONSTANT_Long; }
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55 bool is_double() const { return _tag == JVM_CONSTANT_Double; }
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56 bool is_name_and_type() const { return _tag == JVM_CONSTANT_NameAndType; }
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57 bool is_utf8() const { return _tag == JVM_CONSTANT_Utf8; }
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58
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59 bool is_invalid() const { return _tag == JVM_CONSTANT_Invalid; }
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60
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61 bool is_unresolved_klass() const {
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62 return _tag == JVM_CONSTANT_UnresolvedClass || _tag == JVM_CONSTANT_UnresolvedClassInError;
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63 }
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64
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65 bool is_unresolved_klass_in_error() const {
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66 return _tag == JVM_CONSTANT_UnresolvedClassInError;
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67 }
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68
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69 bool is_klass_index() const { return _tag == JVM_CONSTANT_ClassIndex; }
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70 bool is_unresolved_string() const { return _tag == JVM_CONSTANT_UnresolvedString; }
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71 bool is_string_index() const { return _tag == JVM_CONSTANT_StringIndex; }
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72
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73 bool is_klass_reference() const { return is_klass_index() || is_unresolved_klass(); }
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74 bool is_field_or_method() const { return is_field() || is_method() || is_interface_method(); }
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75 bool is_symbol() const { return is_utf8(); }
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76
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77 constantTag(jbyte tag) {
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78 assert((tag >= 0 && tag <= JVM_CONSTANT_NameAndType) ||
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79 (tag >= JVM_CONSTANT_InternalMin && tag <= JVM_CONSTANT_InternalMax), "Invalid constant tag");
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80 _tag = tag;
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81 }
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82
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83 jbyte value() { return _tag; }
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84
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85 void print_on(outputStream* st) const PRODUCT_RETURN;
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86 };
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