/*
* Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.tools.javac.api;
import java.io.IOException;
import java.util.Map;
import javax.annotation.processing.ProcessingEnvironment;
import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.AnnotationValue;
import javax.lang.model.element.Element;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.element.TypeElement;
import javax.lang.model.type.DeclaredType;
import javax.lang.model.type.TypeMirror;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileObject;
import com.sun.source.tree.CompilationUnitTree;
import com.sun.source.tree.Scope;
import com.sun.source.tree.Tree;
import com.sun.source.util.SourcePositions;
import com.sun.source.util.TreePath;
import com.sun.source.util.Trees;
import com.sun.tools.javac.code.Symbol.ClassSymbol;
import com.sun.tools.javac.code.Symbol.TypeSymbol;
import com.sun.tools.javac.code.Symbol;
import com.sun.tools.javac.comp.Attr;
import com.sun.tools.javac.comp.AttrContext;
import com.sun.tools.javac.comp.Enter;
import com.sun.tools.javac.comp.Env;
import com.sun.tools.javac.comp.MemberEnter;
import com.sun.tools.javac.comp.Resolve;
import com.sun.tools.javac.model.JavacElements;
import com.sun.tools.javac.processing.JavacProcessingEnvironment;
import com.sun.tools.javac.tree.JCTree.*;
import com.sun.tools.javac.tree.JCTree;
import com.sun.tools.javac.tree.TreeCopier;
import com.sun.tools.javac.tree.TreeInfo;
import com.sun.tools.javac.tree.TreeMaker;
import com.sun.tools.javac.util.Context;
import com.sun.tools.javac.util.List;
import com.sun.tools.javac.util.Log;
import com.sun.tools.javac.util.Pair;
/**
* Provides an implementation of Trees.
*
* <p><b>This is NOT part of any supported API.
* If you write code that depends on this, you do so at your own
* risk. This code and its internal interfaces are subject to change
* or deletion without notice.</b></p>
*
* @author Peter von der Ahé
*/
public class JavacTrees extends Trees {
private final Resolve resolve;
private final Enter enter;
private final Log log;
private final MemberEnter memberEnter;
private final Attr attr;
private final TreeMaker treeMaker;
private final JavacElements elements;
private final JavacTaskImpl javacTaskImpl;
public static JavacTrees instance(JavaCompiler.CompilationTask task) {
if (!(task instanceof JavacTaskImpl))
throw new IllegalArgumentException();
return instance(((JavacTaskImpl)task).getContext());
}
public static JavacTrees instance(ProcessingEnvironment env) {
if (!(env instanceof JavacProcessingEnvironment))
throw new IllegalArgumentException();
return instance(((JavacProcessingEnvironment)env).getContext());
}
public static JavacTrees instance(Context context) {
JavacTrees instance = context.get(JavacTrees.class);
if (instance == null)
instance = new JavacTrees(context);
return instance;
}
private JavacTrees(Context context) {
context.put(JavacTrees.class, this);
attr = Attr.instance(context);
enter = Enter.instance(context);
elements = JavacElements.instance(context);
log = Log.instance(context);
resolve = Resolve.instance(context);
treeMaker = TreeMaker.instance(context);
memberEnter = MemberEnter.instance(context);
javacTaskImpl = context.get(JavacTaskImpl.class);
}
public SourcePositions getSourcePositions() {
return new SourcePositions() {
public long getStartPosition(CompilationUnitTree file, Tree tree) {
return TreeInfo.getStartPos((JCTree) tree);
}
public long getEndPosition(CompilationUnitTree file, Tree tree) {
Map<JCTree,Integer> endPositions = ((JCCompilationUnit) file).endPositions;
return TreeInfo.getEndPos((JCTree) tree, endPositions);
}
};
}
public JCClassDecl getTree(TypeElement element) {
return (JCClassDecl) getTree((Element) element);
}
public JCMethodDecl getTree(ExecutableElement method) {
return (JCMethodDecl) getTree((Element) method);
}
public JCTree getTree(Element element) {
Symbol symbol = (Symbol) element;
TypeSymbol enclosing = symbol.enclClass();
Env<AttrContext> env = enter.getEnv(enclosing);
if (env == null)
return null;
JCClassDecl classNode = env.enclClass;
if (classNode != null) {
if (TreeInfo.symbolFor(classNode) == element)
return classNode;
for (JCTree node : classNode.getMembers())
if (TreeInfo.symbolFor(node) == element)
return node;
}
return null;
}
public JCTree getTree(Element e, AnnotationMirror a) {
return getTree(e, a, null);
}
public JCTree getTree(Element e, AnnotationMirror a, AnnotationValue v) {
Pair<JCTree, JCCompilationUnit> treeTopLevel = elements.getTreeAndTopLevel(e, a, v);
if (treeTopLevel == null)
return null;
return treeTopLevel.fst;
}
public TreePath getPath(CompilationUnitTree unit, Tree node) {
return TreePath.getPath(unit, node);
}
public TreePath getPath(Element e) {
return getPath(e, null, null);
}
public TreePath getPath(Element e, AnnotationMirror a) {
return getPath(e, a, null);
}
public TreePath getPath(Element e, AnnotationMirror a, AnnotationValue v) {
final Pair<JCTree, JCCompilationUnit> treeTopLevel = elements.getTreeAndTopLevel(e, a, v);
if (treeTopLevel == null)
return null;
return TreePath.getPath(treeTopLevel.snd, treeTopLevel.fst);
}
public Element getElement(TreePath path) {
Tree t = path.getLeaf();
return TreeInfo.symbolFor((JCTree) t);
}
public TypeMirror getTypeMirror(TreePath path) {
Tree t = path.getLeaf();
return ((JCTree)t).type;
}
public JavacScope getScope(TreePath path) {
return new JavacScope(getAttrContext(path));
}
public boolean isAccessible(Scope scope, TypeElement type) {
if (scope instanceof JavacScope && type instanceof ClassSymbol) {
Env<AttrContext> env = ((JavacScope) scope).env;
return resolve.isAccessible(env, (ClassSymbol)type);
} else
return false;
}
public boolean isAccessible(Scope scope, Element member, DeclaredType type) {
if (scope instanceof JavacScope
&& member instanceof Symbol
&& type instanceof com.sun.tools.javac.code.Type) {
Env<AttrContext> env = ((JavacScope) scope).env;
return resolve.isAccessible(env, (com.sun.tools.javac.code.Type)type, (Symbol)member);
} else
return false;
}
private Env<AttrContext> getAttrContext(TreePath path) {
if (!(path.getLeaf() instanceof JCTree)) // implicit null-check
throw new IllegalArgumentException();
// if we're being invoked via from a JSR199 client, we need to make sure
// all the classes have been entered; if we're being invoked from JSR269,
// then the classes will already have been entered.
if (javacTaskImpl != null) {
try {
javacTaskImpl.enter(null);
} catch (IOException e) {
throw new Error("unexpected error while entering symbols: " + e);
}
}
JCCompilationUnit unit = (JCCompilationUnit) path.getCompilationUnit();
Copier copier = new Copier(treeMaker.forToplevel(unit));
Env<AttrContext> env = null;
JCMethodDecl method = null;
JCVariableDecl field = null;
List<Tree> l = List.nil();
TreePath p = path;
while (p != null) {
l = l.prepend(p.getLeaf());
p = p.getParentPath();
}
for ( ; l.nonEmpty(); l = l.tail) {
Tree tree = l.head;
switch (tree.getKind()) {
case COMPILATION_UNIT:
// System.err.println("COMP: " + ((JCCompilationUnit)tree).sourcefile);
env = enter.getTopLevelEnv((JCCompilationUnit)tree);
break;
case CLASS:
// System.err.println("CLASS: " + ((JCClassDecl)tree).sym.getSimpleName());
env = enter.getClassEnv(((JCClassDecl)tree).sym);
break;
case METHOD:
// System.err.println("METHOD: " + ((JCMethodDecl)tree).sym.getSimpleName());
method = (JCMethodDecl)tree;
break;
case VARIABLE:
// System.err.println("FIELD: " + ((JCVariableDecl)tree).sym.getSimpleName());
field = (JCVariableDecl)tree;
break;
case BLOCK: {
// System.err.println("BLOCK: ");
if (method != null)
env = memberEnter.getMethodEnv(method, env);
JCTree body = copier.copy((JCTree)tree, (JCTree) path.getLeaf());
env = attribStatToTree(body, env, copier.leafCopy);
return env;
}
default:
// System.err.println("DEFAULT: " + tree.getKind());
if (field != null && field.getInitializer() == tree) {
env = memberEnter.getInitEnv(field, env);
JCExpression expr = copier.copy((JCExpression)tree, (JCTree) path.getLeaf());
env = attribExprToTree(expr, env, copier.leafCopy);
return env;
}
}
}
return field != null ? memberEnter.getInitEnv(field, env) : env;
}
private Env<AttrContext> attribStatToTree(JCTree stat, Env<AttrContext>env, JCTree tree) {
JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
try {
return attr.attribStatToTree(stat, env, tree);
} finally {
log.useSource(prev);
}
}
private Env<AttrContext> attribExprToTree(JCExpression expr, Env<AttrContext>env, JCTree tree) {
JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
try {
return attr.attribExprToTree(expr, env, tree);
} finally {
log.useSource(prev);
}
}
/**
* Makes a copy of a tree, noting the value resulting from copying a particular leaf.
**/
static class Copier extends TreeCopier<JCTree> {
JCTree leafCopy = null;
Copier(TreeMaker M) {
super(M);
}
public <T extends JCTree> T copy(T t, JCTree leaf) {
T t2 = super.copy(t, leaf);
if (t == leaf)
leafCopy = t2;
return t2;
}
}
}