Mercurial > jdk8-mips64-public > langtools / file revision
src/share/classes/com/sun/tools/javac/api/JavacTrees.java@91eea580fbe9
src/share/classes/com/sun/tools/javac/api/JavacTrees.java
Tue, 09 Sep 2008 10:28:21 -0700
- author
- jjg
- date
- Tue, 09 Sep 2008 10:28:21 -0700
- changeset 110
- 91eea580fbe9
- parent 1
- 9a66ca7c79fa
- child 117
- 24a47c3062fe
- permissions
- -rw-r--r--
6557752: Original type of an AST should be made available even if it is replaced with an ErrorType
Reviewed-by: mcimadamore
1 /*
2 * Copyright 2005-2006 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 */
26 package com.sun.tools.javac.api;
28 import java.io.IOException;
29 import java.util.Map;
30 import javax.annotation.processing.ProcessingEnvironment;
31 import javax.lang.model.element.AnnotationMirror;
32 import javax.lang.model.element.AnnotationValue;
33 import javax.lang.model.element.Element;
34 import javax.lang.model.element.ExecutableElement;
35 import javax.lang.model.element.TypeElement;
36 import javax.lang.model.type.DeclaredType;
37 import javax.lang.model.type.TypeMirror;
38 import javax.tools.JavaCompiler;
39 import javax.tools.JavaFileObject;
41 import com.sun.source.tree.CompilationUnitTree;
42 import com.sun.source.tree.Scope;
43 import com.sun.source.tree.Tree;
44 import com.sun.source.util.SourcePositions;
45 import com.sun.source.util.TreePath;
46 import com.sun.source.util.Trees;
47 import com.sun.tools.javac.code.Symbol.ClassSymbol;
48 import com.sun.tools.javac.code.Symbol.TypeSymbol;
49 import com.sun.tools.javac.code.Symbol;
50 import com.sun.tools.javac.comp.Attr;
51 import com.sun.tools.javac.comp.AttrContext;
52 import com.sun.tools.javac.comp.Enter;
53 import com.sun.tools.javac.comp.Env;
54 import com.sun.tools.javac.comp.MemberEnter;
55 import com.sun.tools.javac.comp.Resolve;
56 import com.sun.tools.javac.model.JavacElements;
57 import com.sun.tools.javac.processing.JavacProcessingEnvironment;
58 import com.sun.tools.javac.tree.JCTree.*;
59 import com.sun.tools.javac.tree.JCTree;
60 import com.sun.tools.javac.tree.TreeCopier;
61 import com.sun.tools.javac.tree.TreeInfo;
62 import com.sun.tools.javac.tree.TreeMaker;
63 import com.sun.tools.javac.util.Context;
64 import com.sun.tools.javac.util.List;
65 import com.sun.tools.javac.util.Log;
66 import com.sun.tools.javac.util.Pair;
68 /**
69 * Provides an implementation of Trees.
70 *
71 * <p><b>This is NOT part of any API supported by Sun Microsystems.
72 * If you write code that depends on this, you do so at your own
73 * risk. This code and its internal interfaces are subject to change
74 * or deletion without notice.</b></p>
75 *
76 * @author Peter von der Ahé
77 */
78 public class JavacTrees extends Trees {
80 private final Resolve resolve;
81 private final Enter enter;
82 private final Log log;
83 private final MemberEnter memberEnter;
84 private final Attr attr;
85 private final TreeMaker treeMaker;
86 private final JavacElements elements;
87 private final JavacTaskImpl javacTaskImpl;
89 public static JavacTrees instance(JavaCompiler.CompilationTask task) {
90 if (!(task instanceof JavacTaskImpl))
91 throw new IllegalArgumentException();
92 return instance(((JavacTaskImpl)task).getContext());
93 }
95 public static JavacTrees instance(ProcessingEnvironment env) {
96 if (!(env instanceof JavacProcessingEnvironment))
97 throw new IllegalArgumentException();
98 return instance(((JavacProcessingEnvironment)env).getContext());
99 }
101 public static JavacTrees instance(Context context) {
102 JavacTrees instance = context.get(JavacTrees.class);
103 if (instance == null)
104 instance = new JavacTrees(context);
105 return instance;
106 }
108 private JavacTrees(Context context) {
109 context.put(JavacTrees.class, this);
110 attr = Attr.instance(context);
111 enter = Enter.instance(context);
112 elements = JavacElements.instance(context);
113 log = Log.instance(context);
114 resolve = Resolve.instance(context);
115 treeMaker = TreeMaker.instance(context);
116 memberEnter = MemberEnter.instance(context);
117 javacTaskImpl = context.get(JavacTaskImpl.class);
118 }
120 public SourcePositions getSourcePositions() {
121 return new SourcePositions() {
122 public long getStartPosition(CompilationUnitTree file, Tree tree) {
123 return TreeInfo.getStartPos((JCTree) tree);
124 }
126 public long getEndPosition(CompilationUnitTree file, Tree tree) {
127 Map<JCTree,Integer> endPositions = ((JCCompilationUnit) file).endPositions;
128 return TreeInfo.getEndPos((JCTree) tree, endPositions);
129 }
130 };
131 }
133 public JCClassDecl getTree(TypeElement element) {
134 return (JCClassDecl) getTree((Element) element);
135 }
137 public JCMethodDecl getTree(ExecutableElement method) {
138 return (JCMethodDecl) getTree((Element) method);
139 }
141 public JCTree getTree(Element element) {
142 Symbol symbol = (Symbol) element;
143 TypeSymbol enclosing = symbol.enclClass();
144 Env<AttrContext> env = enter.getEnv(enclosing);
145 if (env == null)
146 return null;
147 JCClassDecl classNode = env.enclClass;
148 if (classNode != null) {
149 if (TreeInfo.symbolFor(classNode) == element)
150 return classNode;
151 for (JCTree node : classNode.getMembers())
152 if (TreeInfo.symbolFor(node) == element)
153 return node;
154 }
155 return null;
156 }
158 public JCTree getTree(Element e, AnnotationMirror a) {
159 return getTree(e, a, null);
160 }
162 public JCTree getTree(Element e, AnnotationMirror a, AnnotationValue v) {
163 Pair<JCTree, JCCompilationUnit> treeTopLevel = elements.getTreeAndTopLevel(e, a, v);
164 if (treeTopLevel == null)
165 return null;
166 return treeTopLevel.fst;
167 }
169 public TreePath getPath(CompilationUnitTree unit, Tree node) {
170 return TreePath.getPath(unit, node);
171 }
173 public TreePath getPath(Element e) {
174 return getPath(e, null, null);
175 }
177 public TreePath getPath(Element e, AnnotationMirror a) {
178 return getPath(e, a, null);
179 }
181 public TreePath getPath(Element e, AnnotationMirror a, AnnotationValue v) {
182 final Pair<JCTree, JCCompilationUnit> treeTopLevel = elements.getTreeAndTopLevel(e, a, v);
183 if (treeTopLevel == null)
184 return null;
185 return TreePath.getPath(treeTopLevel.snd, treeTopLevel.fst);
186 }
188 public Element getElement(TreePath path) {
189 Tree t = path.getLeaf();
190 return TreeInfo.symbolFor((JCTree) t);
191 }
193 public TypeMirror getTypeMirror(TreePath path) {
194 Tree t = path.getLeaf();
195 return ((JCTree)t).type;
196 }
198 public JavacScope getScope(TreePath path) {
199 return new JavacScope(getAttrContext(path));
200 }
202 public boolean isAccessible(Scope scope, TypeElement type) {
203 if (scope instanceof JavacScope && type instanceof ClassSymbol) {
204 Env<AttrContext> env = ((JavacScope) scope).env;
205 return resolve.isAccessible(env, (ClassSymbol)type);
206 } else
207 return false;
208 }
210 public boolean isAccessible(Scope scope, Element member, DeclaredType type) {
211 if (scope instanceof JavacScope
212 && member instanceof Symbol
213 && type instanceof com.sun.tools.javac.code.Type) {
214 Env<AttrContext> env = ((JavacScope) scope).env;
215 return resolve.isAccessible(env, (com.sun.tools.javac.code.Type)type, (Symbol)member);
216 } else
217 return false;
218 }
220 private Env<AttrContext> getAttrContext(TreePath path) {
221 if (!(path.getLeaf() instanceof JCTree)) // implicit null-check
222 throw new IllegalArgumentException();
224 // if we're being invoked via from a JSR199 client, we need to make sure
225 // all the classes have been entered; if we're being invoked from JSR269,
226 // then the classes will already have been entered.
227 if (javacTaskImpl != null) {
228 try {
229 javacTaskImpl.enter(null);
230 } catch (IOException e) {
231 throw new Error("unexpected error while entering symbols: " + e);
232 }
233 }
236 JCCompilationUnit unit = (JCCompilationUnit) path.getCompilationUnit();
237 Copier copier = new Copier(treeMaker.forToplevel(unit));
239 Env<AttrContext> env = null;
240 JCMethodDecl method = null;
241 JCVariableDecl field = null;
243 List<Tree> l = List.nil();
244 TreePath p = path;
245 while (p != null) {
246 l = l.prepend(p.getLeaf());
247 p = p.getParentPath();
248 }
250 for ( ; l.nonEmpty(); l = l.tail) {
251 Tree tree = l.head;
252 switch (tree.getKind()) {
253 case COMPILATION_UNIT:
254 // System.err.println("COMP: " + ((JCCompilationUnit)tree).sourcefile);
255 env = enter.getTopLevelEnv((JCCompilationUnit)tree);
256 break;
257 case CLASS:
258 // System.err.println("CLASS: " + ((JCClassDecl)tree).sym.getSimpleName());
259 env = enter.getClassEnv(((JCClassDecl)tree).sym);
260 break;
261 case METHOD:
262 // System.err.println("METHOD: " + ((JCMethodDecl)tree).sym.getSimpleName());
263 method = (JCMethodDecl)tree;
264 break;
265 case VARIABLE:
266 // System.err.println("FIELD: " + ((JCVariableDecl)tree).sym.getSimpleName());
267 field = (JCVariableDecl)tree;
268 break;
269 case BLOCK: {
270 // System.err.println("BLOCK: ");
271 if (method != null)
272 env = memberEnter.getMethodEnv(method, env);
273 JCTree body = copier.copy((JCTree)tree, (JCTree) path.getLeaf());
274 env = attribStatToTree(body, env, copier.leafCopy);
275 return env;
276 }
277 default:
278 // System.err.println("DEFAULT: " + tree.getKind());
279 if (field != null && field.getInitializer() == tree) {
280 env = memberEnter.getInitEnv(field, env);
281 JCExpression expr = copier.copy((JCExpression)tree, (JCTree) path.getLeaf());
282 env = attribExprToTree(expr, env, copier.leafCopy);
283 return env;
284 }
285 }
286 }
287 return field != null ? memberEnter.getInitEnv(field, env) : env;
288 }
290 private Env<AttrContext> attribStatToTree(JCTree stat, Env<AttrContext>env, JCTree tree) {
291 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
292 try {
293 return attr.attribStatToTree(stat, env, tree);
294 } finally {
295 log.useSource(prev);
296 }
297 }
299 private Env<AttrContext> attribExprToTree(JCExpression expr, Env<AttrContext>env, JCTree tree) {
300 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
301 try {
302 return attr.attribExprToTree(expr, env, tree);
303 } finally {
304 log.useSource(prev);
305 }
306 }
308 /**
309 * Makes a copy of a tree, noting the value resulting from copying a particular leaf.
310 **/
311 static class Copier extends TreeCopier<JCTree> {
312 JCTree leafCopy = null;
314 Copier(TreeMaker M) {
315 super(M);
316 }
318 public <T extends JCTree> T copy(T t, JCTree leaf) {
319 T t2 = super.copy(t, leaf);
320 if (t == leaf)
321 leafCopy = t2;
322 return t2;
323 }
324 }
326 /**
327 * Gets the original type from the ErrorType object.
328 * @param errorType The errorType for which we want to get the original type.
329 * @returns TypeMirror corresponding to the original type, replaced by the ErrorType.
330 * noType (type.tag == NONE) is returned if there is no original type.
331 */
332 public TypeMirror getOriginalType(javax.lang.model.type.ErrorType errorType) {
333 if (errorType instanceof com.sun.tools.javac.code.Type.ErrorType) {
334 return ((com.sun.tools.javac.code.Type.ErrorType)errorType).getOriginalType();
335 }
337 return com.sun.tools.javac.code.Type.noType;
338 }
339 }
