J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1994-2004 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.tools.java; |
| 27 | |
| 28 | /** |
| 29 | * This class represents an Java class declaration. It refers |
| 30 | * to either a binary or source definition. |
| 31 | * |
| 32 | * ClassDefinitions are loaded on demand, this means that |
| 33 | * class declarations are late bound. The definition of the |
| 34 | * class is obtained in stages. The status field describes |
| 35 | * the state of the class definition: |
| 36 | * |
| 37 | * CS_UNDEFINED - the definition is not yet loaded |
| 38 | * CS_UNDECIDED - a binary definition is loaded, but it is |
| 39 | * still unclear if the source definition need to |
| 40 | * be loaded |
| 41 | * CS_BINARY - the binary class is loaded |
| 42 | * CS_PARSED - the class is loaded from the source file, the |
| 43 | * type information is available, but the class has |
| 44 | * not yet been compiled. |
| 45 | * CS_CHECKED - the class is loaded from the source file and has |
| 46 | * been type-checked. |
| 47 | * CS_COMPILED - the class has been type checked, compiled, |
| 48 | * and written out. |
| 49 | * CS_NOTFOUND - no class definition could be found |
| 50 | * |
| 51 | * WARNING: The contents of this source file are not part of any |
| 52 | * supported API. Code that depends on them does so at its own risk: |
| 53 | * they are subject to change or removal without notice. |
| 54 | */ |
| 55 | |
| 56 | public final |
| 57 | class ClassDeclaration implements Constants { |
| 58 | int status; |
| 59 | Type type; |
| 60 | ClassDefinition definition; |
| 61 | |
| 62 | /** |
| 63 | * Constructor |
| 64 | */ |
| 65 | public ClassDeclaration(Identifier name) { |
| 66 | this.type = Type.tClass(name); |
| 67 | } |
| 68 | |
| 69 | /** |
| 70 | * Get the status of the class |
| 71 | */ |
| 72 | public int getStatus() { |
| 73 | return status; |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * Get the name of the class |
| 78 | */ |
| 79 | public Identifier getName() { |
| 80 | return type.getClassName(); |
| 81 | } |
| 82 | |
| 83 | /** |
| 84 | * Get the type of the class |
| 85 | */ |
| 86 | public Type getType() { |
| 87 | return type; |
| 88 | } |
| 89 | |
| 90 | /** |
| 91 | * Check if the class is defined |
| 92 | */ |
| 93 | public boolean isDefined() { |
| 94 | switch (status) { |
| 95 | case CS_BINARY: |
| 96 | case CS_PARSED: |
| 97 | case CS_CHECKED: |
| 98 | case CS_COMPILED: |
| 99 | return true; |
| 100 | } |
| 101 | return false; |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * Get the definition of this class. Returns null if |
| 106 | * the class is not yet defined. |
| 107 | */ |
| 108 | public ClassDefinition getClassDefinition() { |
| 109 | return definition; |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * This is a flag for use by getClassDefinition(env). It is |
| 114 | * used to mark that a class has been successfully looked up |
| 115 | * by that method before. |
| 116 | */ |
| 117 | private boolean found = false; |
| 118 | |
| 119 | /** |
| 120 | * Get the definition of this class, if the class is not |
| 121 | * yet defined, load the definition. Loading a class may |
| 122 | * throw various exceptions. |
| 123 | */ |
| 124 | public ClassDefinition getClassDefinition(Environment env) |
| 125 | throws ClassNotFound { |
| 126 | if (tracing) env.dtEvent("getClassDefinition: " + |
| 127 | getName() + ", status " + getStatus()); |
| 128 | |
| 129 | // The majority of calls to getClassDefinition() are duplicates. |
| 130 | // This check makes them fast. It also allows us to avoid |
| 131 | // duplicate, useless calls to basicCheck(). In the future it |
| 132 | // would be good to add an additional status value, CS_BASICCHECKED. |
| 133 | if (found) { |
| 134 | return definition; |
| 135 | } |
| 136 | |
| 137 | for(;;) { |
| 138 | switch (status) { |
| 139 | case CS_UNDEFINED: |
| 140 | case CS_UNDECIDED: |
| 141 | case CS_SOURCE: |
| 142 | env.loadDefinition(this); |
| 143 | break; |
| 144 | |
| 145 | case CS_BINARY: |
| 146 | case CS_PARSED: |
| 147 | //+FIX FOR BUGID 4056065 |
| 148 | //definition.basicCheck(env); |
| 149 | if (!definition.isInsideLocal()) { |
| 150 | // Classes inside a block, including anonymous classes, |
| 151 | // are checked when their surrounding member is checked. |
| 152 | definition.basicCheck(env); |
| 153 | } |
| 154 | //-FIX FOR BUGID 4056065 |
| 155 | found = true; |
| 156 | return definition; |
| 157 | |
| 158 | case CS_CHECKED: |
| 159 | case CS_COMPILED: |
| 160 | found = true; |
| 161 | return definition; |
| 162 | |
| 163 | default: |
| 164 | throw new ClassNotFound(getName()); |
| 165 | } |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | /** |
| 170 | * Get the definition of this class, if the class is not |
| 171 | * yet defined, load the definition. Loading a class may |
| 172 | * throw various exceptions. Perform no basicCheck() on this |
| 173 | * class. |
| 174 | */ |
| 175 | public ClassDefinition getClassDefinitionNoCheck(Environment env) throws ClassNotFound { |
| 176 | if (tracing) env.dtEvent("getClassDefinition: " + |
| 177 | getName() + ", status " + getStatus()); |
| 178 | for(;;) { |
| 179 | switch (status) { |
| 180 | case CS_UNDEFINED: |
| 181 | case CS_UNDECIDED: |
| 182 | case CS_SOURCE: |
| 183 | env.loadDefinition(this); |
| 184 | break; |
| 185 | |
| 186 | case CS_BINARY: |
| 187 | case CS_PARSED: |
| 188 | case CS_CHECKED: |
| 189 | case CS_COMPILED: |
| 190 | return definition; |
| 191 | |
| 192 | default: |
| 193 | throw new ClassNotFound(getName()); |
| 194 | } |
| 195 | } |
| 196 | } |
| 197 | |
| 198 | /** |
| 199 | * Set the class definition |
| 200 | */ |
| 201 | public void setDefinition(ClassDefinition definition, int status) { |
| 202 | |
| 203 | // Sanity checks. |
| 204 | |
| 205 | // The name of the definition should match that of the declaration. |
| 206 | if ((definition != null) && !getName().equals(definition.getName())) { |
| 207 | throw new CompilerError("setDefinition: name mismatch: " + |
| 208 | this + ", " + definition); |
| 209 | } |
| 210 | |
| 211 | // The status states can be considered ordered in the same |
| 212 | // manner as their numerical values. We expect classes to |
| 213 | // progress through a sequence of monotonically increasing |
| 214 | // states. NOTE: There are currently exceptions to this rule |
| 215 | // which are believed to be legitimate. In particular, a |
| 216 | // class may be checked more than once, though we believe that |
| 217 | // this is unnecessary and may be avoided. |
| 218 | /*-----------------* |
| 219 | if (status <= this.status) { |
| 220 | System.out.println("STATUS REGRESSION: " + |
| 221 | this + " FROM " + this.status + " TO " + status); |
| 222 | } |
| 223 | *------------------*/ |
| 224 | |
| 225 | this.definition = definition; |
| 226 | this.status = status; |
| 227 | } |
| 228 | |
| 229 | /** |
| 230 | * Equality |
| 231 | */ |
| 232 | public boolean equals(Object obj) { |
| 233 | if ((obj != null) && (obj instanceof ClassDeclaration)) { |
| 234 | return type.equals(((ClassDeclaration)obj).type); |
| 235 | } |
| 236 | return false; |
| 237 | } |
| 238 | |
| 239 | /** |
| 240 | * toString |
| 241 | */ |
| 242 | public String toString() { |
| 243 | String name = getName().toString(); |
| 244 | String type = "type "; |
| 245 | String nested = getName().isInner() ? "nested " : ""; |
| 246 | if (getClassDefinition() != null) { |
| 247 | if (getClassDefinition().isInterface()) { |
| 248 | type = "interface "; |
| 249 | } else { |
| 250 | type = "class "; |
| 251 | } |
| 252 | if (!getClassDefinition().isTopLevel()) { |
| 253 | nested = "inner "; |
| 254 | if (getClassDefinition().isLocal()) { |
| 255 | nested = "local "; |
| 256 | if (!getClassDefinition().isAnonymous()) { |
| 257 | name = getClassDefinition().getLocalName() + |
| 258 | " (" + name + ")"; |
| 259 | } |
| 260 | } |
| 261 | } |
| 262 | } |
| 263 | return nested + type + name; |
| 264 | } |
| 265 | } |