Source Code Cross Referenced for Annotate.java in  » 6.0-JDK-Modules-sun » javac-compiler » com » sun » tools » javac » comp » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules sun » javac compiler » com.sun.tools.javac.comp 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2003-2006 Sun Microsystems, Inc.  All Rights Reserved.
003:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
004:         *
005:         * This code is free software; you can redistribute it and/or modify it
006:         * under the terms of the GNU General Public License version 2 only, as
007:         * published by the Free Software Foundation.  Sun designates this
008:         * particular file as subject to the "Classpath" exception as provided
009:         * by Sun in the LICENSE file that accompanied this code.
010:         *
011:         * This code is distributed in the hope that it will be useful, but WITHOUT
012:         * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
013:         * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
014:         * version 2 for more details (a copy is included in the LICENSE file that
015:         * accompanied this code).
016:         *
017:         * You should have received a copy of the GNU General Public License version
018:         * 2 along with this work; if not, write to the Free Software Foundation,
019:         * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
020:         *
021:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
022:         * CA 95054 USA or visit www.sun.com if you need additional information or
023:         * have any questions.
024:         */
025:
026:        package com.sun.tools.javac.comp;
027:
028:        import com.sun.tools.javac.util.*;
029:        import com.sun.tools.javac.code.*;
030:        import com.sun.tools.javac.code.Symbol.*;
031:        import com.sun.tools.javac.tree.*;
032:        import com.sun.tools.javac.tree.JCTree.*;
033:
034:        /** Enter annotations on symbols.  Annotations accumulate in a queue,
035:         *  which is processed at the top level of any set of recursive calls
036:         *  requesting it be processed.
037:         *
038:         *  <p><b>This is NOT part of any API supported by Sun Microsystems.  If
039:         *  you write code that depends on this, you do so at your own risk.
040:         *  This code and its internal interfaces are subject to change or
041:         *  deletion without notice.</b>
042:         */
043:        @Version("@(#)Annotate.java	1.44 07/06/14")
044:        public class Annotate {
045:            protected static final Context.Key<Annotate> annotateKey = new Context.Key<Annotate>();
046:
047:            public static Annotate instance(Context context) {
048:                Annotate instance = context.get(annotateKey);
049:                if (instance == null)
050:                    instance = new Annotate(context);
051:                return instance;
052:            }
053:
054:            final Attr attr;
055:            final TreeMaker make;
056:            final Log log;
057:            final Symtab syms;
058:            final Name.Table names;
059:            final Resolve rs;
060:            final Types types;
061:            final ConstFold cfolder;
062:            final Check chk;
063:
064:            protected Annotate(Context context) {
065:                context.put(annotateKey, this );
066:                attr = Attr.instance(context);
067:                make = TreeMaker.instance(context);
068:                log = Log.instance(context);
069:                syms = Symtab.instance(context);
070:                names = Name.Table.instance(context);
071:                rs = Resolve.instance(context);
072:                types = Types.instance(context);
073:                cfolder = ConstFold.instance(context);
074:                chk = Check.instance(context);
075:            }
076:
077:            /* ********************************************************************
078:             * Queue maintenance
079:             *********************************************************************/
080:
081:            private int enterCount = 0;
082:
083:            ListBuffer<Annotator> q = new ListBuffer<Annotator>();
084:
085:            public void later(Annotator a) {
086:                q.append(a);
087:            }
088:
089:            public void earlier(Annotator a) {
090:                q.prepend(a);
091:            }
092:
093:            /** Called when the Enter phase starts. */
094:            public void enterStart() {
095:                enterCount++;
096:            }
097:
098:            /** Called after the Enter phase completes. */
099:            public void enterDone() {
100:                enterCount--;
101:                flush();
102:            }
103:
104:            public void flush() {
105:                if (enterCount != 0)
106:                    return;
107:                enterCount++;
108:                try {
109:                    while (q.nonEmpty())
110:                        q.next().enterAnnotation();
111:                } finally {
112:                    enterCount--;
113:                }
114:            }
115:
116:            /** A client that has annotations to add registers an annotator,
117:             *  the method it will use to add the annotation.  There are no
118:             *  parameters; any needed data should be captured by the
119:             *  Annotator.
120:             */
121:            public interface Annotator {
122:                void enterAnnotation();
123:
124:                String toString();
125:            }
126:
127:            /* ********************************************************************
128:             * Compute an attribute from its annotation.
129:             *********************************************************************/
130:
131:            /** Process a single compound annotation, returning its
132:             *  Attribute. Used from MemberEnter for attaching the attributes
133:             *  to the annotated symbol.
134:             */
135:            Attribute.Compound enterAnnotation(JCAnnotation a, Type expected,
136:                    Env<AttrContext> env) {
137:                // The annotation might have had its type attributed (but not checked)
138:                // by attr.attribAnnotationTypes during MemberEnter, in which case we do not
139:                // need to do it again.
140:                Type at = (a.annotationType.type != null ? a.annotationType.type
141:                        : attr.attribType(a.annotationType, env));
142:                a.type = chk.checkType(a.annotationType.pos(), at, expected);
143:                if (a.type.isErroneous())
144:                    return new Attribute.Compound(a.type, List
145:                            .<Pair<MethodSymbol, Attribute>> nil());
146:                if ((a.type.tsym.flags() & Flags.ANNOTATION) == 0) {
147:                    log.error(a.annotationType.pos(), "not.annotation.type",
148:                            a.type.toString());
149:                    return new Attribute.Compound(a.type, List
150:                            .<Pair<MethodSymbol, Attribute>> nil());
151:                }
152:                List<JCExpression> args = a.args;
153:                if (args.length() == 1 && args.head.getTag() != JCTree.ASSIGN) {
154:                    // special case: elided "value=" assumed
155:                    args.head = make.at(args.head.pos).Assign(
156:                            make.Ident(names.value), args.head);
157:                }
158:                ListBuffer<Pair<MethodSymbol, Attribute>> buf = new ListBuffer<Pair<MethodSymbol, Attribute>>();
159:                for (List<JCExpression> tl = args; tl.nonEmpty(); tl = tl.tail) {
160:                    JCExpression t = tl.head;
161:                    if (t.getTag() != JCTree.ASSIGN) {
162:                        log.error(t.pos(),
163:                                "annotation.value.must.be.name.value");
164:                        continue;
165:                    }
166:                    JCAssign assign = (JCAssign) t;
167:                    if (assign.lhs.getTag() != JCTree.IDENT) {
168:                        log.error(t.pos(),
169:                                "annotation.value.must.be.name.value");
170:                        continue;
171:                    }
172:                    JCIdent left = (JCIdent) assign.lhs;
173:                    Symbol method = rs.resolveQualifiedMethod(left.pos(), env,
174:                            a.type, left.name, List.<Type> nil(), null);
175:                    left.sym = method;
176:                    left.type = method.type;
177:                    if (method.owner != a.type.tsym)
178:                        log.error(left.pos(), "no.annotation.member",
179:                                left.name, a.type);
180:                    Type result = method.type.getReturnType();
181:                    Attribute value = enterAttributeValue(result, assign.rhs,
182:                            env);
183:                    if (!method.type.isErroneous())
184:                        buf.append(new Pair<MethodSymbol, Attribute>(
185:                                (MethodSymbol) method, value));
186:                }
187:                return new Attribute.Compound(a.type, buf.toList());
188:            }
189:
190:            Attribute enterAttributeValue(Type expected, JCExpression tree,
191:                    Env<AttrContext> env) {
192:                if (expected.isPrimitive()
193:                        || types.isSameType(expected, syms.stringType)) {
194:                    Type result = attr.attribExpr(tree, env, expected);
195:                    if (result.isErroneous())
196:                        return new Attribute.Error(expected);
197:                    if (result.constValue() == null) {
198:                        log.error(tree.pos(),
199:                                "attribute.value.must.be.constant");
200:                        return new Attribute.Error(expected);
201:                    }
202:                    result = cfolder.coerce(result, expected);
203:                    return new Attribute.Constant(expected, result.constValue());
204:                }
205:                if (expected.tsym == syms.classType.tsym) {
206:                    Type result = attr.attribExpr(tree, env, expected);
207:                    if (result.isErroneous())
208:                        return new Attribute.Error(expected);
209:                    if (TreeInfo.name(tree) != names._class) {
210:                        log.error(tree.pos(),
211:                                "annotation.value.must.be.class.literal");
212:                        return new Attribute.Error(expected);
213:                    }
214:                    return new Attribute.Class(types,
215:                            (((JCFieldAccess) tree).selected).type);
216:                }
217:                if ((expected.tsym.flags() & Flags.ANNOTATION) != 0) {
218:                    if (tree.getTag() != JCTree.ANNOTATION) {
219:                        log.error(tree.pos(),
220:                                "annotation.value.must.be.annotation");
221:                        expected = syms.errorType;
222:                    }
223:                    return enterAnnotation((JCAnnotation) tree, expected, env);
224:                }
225:                if (expected.tag == TypeTags.ARRAY) { // should really be isArray()
226:                    if (tree.getTag() != JCTree.NEWARRAY) {
227:                        tree = make.at(tree.pos).NewArray(null,
228:                                List.<JCExpression> nil(), List.of(tree));
229:                    }
230:                    JCNewArray na = (JCNewArray) tree;
231:                    if (na.elemtype != null) {
232:                        log.error(na.elemtype.pos(),
233:                                "new.not.allowed.in.annotation");
234:                        return new Attribute.Error(expected);
235:                    }
236:                    ListBuffer<Attribute> buf = new ListBuffer<Attribute>();
237:                    for (List<JCExpression> l = na.elems; l.nonEmpty(); l = l.tail) {
238:                        buf.append(enterAttributeValue(
239:                                types.elemtype(expected), l.head, env));
240:                    }
241:                    return new Attribute.Array(expected, buf
242:                            .toArray(new Attribute[buf.length()]));
243:                }
244:                if (expected.tag == TypeTags.CLASS
245:                        && (expected.tsym.flags() & Flags.ENUM) != 0) {
246:                    attr.attribExpr(tree, env, expected);
247:                    Symbol sym = TreeInfo.symbol(tree);
248:                    if (sym == null || TreeInfo.nonstaticSelect(tree)
249:                            || sym.kind != Kinds.VAR
250:                            || (sym.flags() & Flags.ENUM) == 0) {
251:                        log.error(tree.pos(),
252:                                "enum.annotation.must.be.enum.constant");
253:                        return new Attribute.Error(expected);
254:                    }
255:                    VarSymbol enumerator = (VarSymbol) sym;
256:                    return new Attribute.Enum(expected, enumerator);
257:                }
258:                if (!expected.isErroneous())
259:                    log
260:                            .error(tree.pos(),
261:                                    "annotation.value.not.allowable.type");
262:                return new Attribute.Error(attr.attribExpr(tree, env, expected));
263:            }
264:        }
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