1 /* 2 * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved. 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 * 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25 // constant tags in Java .class files 26 27 28 enum { 29 // See jvm.h for shared JVM_CONSTANT_XXX tags 30 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/utilities/ConstantTag.java 31 // Hotspot specific tags 32 JVM_CONSTANT_Invalid = 0, // For bad value initialization 33 JVM_CONSTANT_InternalMin = 100, // First implementation tag (aside from bad value of course) 34 JVM_CONSTANT_UnresolvedClass = 100, // Temporary tag until actual use 35 JVM_CONSTANT_ClassIndex = 101, // Temporary tag while constructing constant pool 36 JVM_CONSTANT_UnresolvedString = 102, // Temporary tag until actual use 37 JVM_CONSTANT_StringIndex = 103, // Temporary tag while constructing constant pool 38 JVM_CONSTANT_UnresolvedClassInError = 104, // Error tag due to resolution error 39 JVM_CONSTANT_Object = 105, // Required for BoundMethodHandle arguments. 40 JVM_CONSTANT_InternalMax = 105 // Last implementation tag 41 }; 42 43 44 class constantTag VALUE_OBJ_CLASS_SPEC { 45 private: 46 jbyte _tag; 47 public: 48 bool is_klass() const { return _tag == JVM_CONSTANT_Class; } 49 bool is_field () const { return _tag == JVM_CONSTANT_Fieldref; } 50 bool is_method() const { return _tag == JVM_CONSTANT_Methodref; } 51 bool is_interface_method() const { return _tag == JVM_CONSTANT_InterfaceMethodref; } 52 bool is_string() const { return _tag == JVM_CONSTANT_String; } 53 bool is_int() const { return _tag == JVM_CONSTANT_Integer; } 54 bool is_float() const { return _tag == JVM_CONSTANT_Float; } 55 bool is_long() const { return _tag == JVM_CONSTANT_Long; } 56 bool is_double() const { return _tag == JVM_CONSTANT_Double; } 57 bool is_name_and_type() const { return _tag == JVM_CONSTANT_NameAndType; } 58 bool is_utf8() const { return _tag == JVM_CONSTANT_Utf8; } 59 60 bool is_invalid() const { return _tag == JVM_CONSTANT_Invalid; } 61 62 bool is_unresolved_klass() const { 63 return _tag == JVM_CONSTANT_UnresolvedClass || _tag == JVM_CONSTANT_UnresolvedClassInError; 64 } 65 66 bool is_unresolved_klass_in_error() const { 67 return _tag == JVM_CONSTANT_UnresolvedClassInError; 68 } 69 70 bool is_klass_index() const { return _tag == JVM_CONSTANT_ClassIndex; } 71 bool is_unresolved_string() const { return _tag == JVM_CONSTANT_UnresolvedString; } 72 bool is_string_index() const { return _tag == JVM_CONSTANT_StringIndex; } 73 74 bool is_object() const { return _tag == JVM_CONSTANT_Object; } 75 76 bool is_klass_reference() const { return is_klass_index() || is_unresolved_klass(); } 77 bool is_klass_or_reference() const{ return is_klass() || is_klass_reference(); } 78 bool is_field_or_method() const { return is_field() || is_method() || is_interface_method(); } 79 bool is_symbol() const { return is_utf8(); } 80 81 constantTag(jbyte tag) { 82 assert((tag >= 0 && tag <= JVM_CONSTANT_NameAndType) || 83 (tag >= JVM_CONSTANT_InternalMin && tag <= JVM_CONSTANT_InternalMax), "Invalid constant tag"); 84 _tag = tag; 85 } 86 87 jbyte value() { return _tag; } 88 89 void print_on(outputStream* st) const PRODUCT_RETURN; 90 };