author | psandoz |
Thu, 24 Mar 2016 11:21:37 +0100 | |
changeset 36995 | e19153419efd |
parent 30064 | 39493809b601 |
child 37744 | bf4fd5e022c5 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package com.sun.tools.javac.comp; |
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import java.util.EnumSet; |
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import java.util.Set; |
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import com.sun.tools.javac.code.*; |
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import com.sun.tools.javac.code.Scope.WriteableScope; |
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import com.sun.tools.javac.tree.*; |
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import com.sun.tools.javac.util.*; |
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import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition; |
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import com.sun.tools.javac.code.Symbol.*; |
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import com.sun.tools.javac.code.Type.*; |
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import com.sun.tools.javac.tree.JCTree.*; |
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import static com.sun.tools.javac.code.Flags.*; |
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import static com.sun.tools.javac.code.Kinds.*; |
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import static com.sun.tools.javac.code.Kinds.Kind.*; |
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import static com.sun.tools.javac.code.TypeTag.TYPEVAR; |
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/** Resolves field, method and constructor header, and constructs corresponding Symbols. |
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* |
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* <p><b>This is NOT part of any supported API. |
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* If you write code that depends on this, you do so at your own risk. |
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* This code and its internal interfaces are subject to change or |
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* deletion without notice.</b> |
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*/ |
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public class MemberEnter extends JCTree.Visitor { |
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protected static final Context.Key<MemberEnter> memberEnterKey = new Context.Key<>(); |
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/** A switch to determine whether we check for package/class conflicts |
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*/ |
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final static boolean checkClash = true; |
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private final Enter enter; |
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private final Log log; |
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private final Check chk; |
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private final Attr attr; |
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private final Symtab syms; |
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private final Annotate annotate; |
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private final Types types; |
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private final DeferredLintHandler deferredLintHandler; |
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public static MemberEnter instance(Context context) { |
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MemberEnter instance = context.get(memberEnterKey); |
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if (instance == null) |
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instance = new MemberEnter(context); |
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return instance; |
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} |
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protected MemberEnter(Context context) { |
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context.put(memberEnterKey, this); |
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enter = Enter.instance(context); |
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log = Log.instance(context); |
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chk = Check.instance(context); |
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attr = Attr.instance(context); |
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syms = Symtab.instance(context); |
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annotate = Annotate.instance(context); |
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types = Types.instance(context); |
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deferredLintHandler = DeferredLintHandler.instance(context); |
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} |
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/** Construct method type from method signature. |
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* @param typarams The method's type parameters. |
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* @param params The method's value parameters. |
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* @param res The method's result type, |
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* null if it is a constructor. |
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* @param recvparam The method's receiver parameter, |
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* null if none given; TODO: or already set here? |
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* @param thrown The method's thrown exceptions. |
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* @param env The method's (local) environment. |
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*/ |
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Type signature(MethodSymbol msym, |
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List<JCTypeParameter> typarams, |
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List<JCVariableDecl> params, |
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JCTree res, |
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JCVariableDecl recvparam, |
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List<JCExpression> thrown, |
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Env<AttrContext> env) { |
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// Enter and attribute type parameters. |
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List<Type> tvars = enter.classEnter(typarams, env); |
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attr.attribTypeVariables(typarams, env); |
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// Enter and attribute value parameters. |
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ListBuffer<Type> argbuf = new ListBuffer<>(); |
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for (List<JCVariableDecl> l = params; l.nonEmpty(); l = l.tail) { |
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memberEnter(l.head, env); |
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argbuf.append(l.head.vartype.type); |
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} |
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// Attribute result type, if one is given. |
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Type restype = res == null ? syms.voidType : attr.attribType(res, env); |
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// Attribute receiver type, if one is given. |
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Type recvtype; |
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if (recvparam!=null) { |
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memberEnter(recvparam, env); |
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recvtype = recvparam.vartype.type; |
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} else { |
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recvtype = null; |
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} |
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// Attribute thrown exceptions. |
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ListBuffer<Type> thrownbuf = new ListBuffer<>(); |
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for (List<JCExpression> l = thrown; l.nonEmpty(); l = l.tail) { |
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Type exc = attr.attribType(l.head, env); |
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if (!exc.hasTag(TYPEVAR)) { |
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exc = chk.checkClassType(l.head.pos(), exc); |
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} else if (exc.tsym.owner == msym) { |
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//mark inference variables in 'throws' clause |
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exc.tsym.flags_field |= THROWS; |
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} |
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thrownbuf.append(exc); |
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} |
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MethodType mtype = new MethodType(argbuf.toList(), |
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restype, |
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thrownbuf.toList(), |
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syms.methodClass); |
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mtype.recvtype = recvtype; |
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return tvars.isEmpty() ? mtype : new ForAll(tvars, mtype); |
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} |
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/* ******************************************************************** |
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* Visitor methods for member enter |
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*********************************************************************/ |
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/** Visitor argument: the current environment |
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*/ |
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protected Env<AttrContext> env; |
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/** Enter field and method definitions and process import |
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* clauses, catching any completion failure exceptions. |
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*/ |
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protected void memberEnter(JCTree tree, Env<AttrContext> env) { |
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Env<AttrContext> prevEnv = this.env; |
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try { |
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this.env = env; |
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tree.accept(this); |
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} catch (CompletionFailure ex) { |
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chk.completionError(tree.pos(), ex); |
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} finally { |
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this.env = prevEnv; |
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} |
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} |
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/** Enter members from a list of trees. |
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*/ |
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void memberEnter(List<? extends JCTree> trees, Env<AttrContext> env) { |
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for (List<? extends JCTree> l = trees; l.nonEmpty(); l = l.tail) |
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memberEnter(l.head, env); |
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} |
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public void visitMethodDef(JCMethodDecl tree) { |
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WriteableScope enclScope = enter.enterScope(env); |
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MethodSymbol m = new MethodSymbol(0, tree.name, null, enclScope.owner); |
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m.flags_field = chk.checkFlags(tree.pos(), tree.mods.flags, m, tree); |
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tree.sym = m; |
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//if this is a default method, add the DEFAULT flag to the enclosing interface |
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if ((tree.mods.flags & DEFAULT) != 0) { |
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m.enclClass().flags_field |= DEFAULT; |
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} |
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Env<AttrContext> localEnv = methodEnv(tree, env); |
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DiagnosticPosition prevLintPos = deferredLintHandler.setPos(tree.pos()); |
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try { |
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// Compute the method type |
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m.type = signature(m, tree.typarams, tree.params, |
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tree.restype, tree.recvparam, |
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tree.thrown, |
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localEnv); |
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} finally { |
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deferredLintHandler.setPos(prevLintPos); |
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} |
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if (types.isSignaturePolymorphic(m)) { |
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m.flags_field |= SIGNATURE_POLYMORPHIC; |
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} |
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// Set m.params |
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ListBuffer<VarSymbol> params = new ListBuffer<>(); |
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JCVariableDecl lastParam = null; |
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for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) { |
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JCVariableDecl param = lastParam = l.head; |
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params.append(Assert.checkNonNull(param.sym)); |
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} |
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m.params = params.toList(); |
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// mark the method varargs, if necessary |
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if (lastParam != null && (lastParam.mods.flags & Flags.VARARGS) != 0) |
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m.flags_field |= Flags.VARARGS; |
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localEnv.info.scope.leave(); |
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if (chk.checkUnique(tree.pos(), m, enclScope)) { |
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enclScope.enter(m); |
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} |
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annotate.annotateLater(tree.mods.annotations, localEnv, m, tree.pos()); |
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// Visit the signature of the method. Note that |
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// TypeAnnotate doesn't descend into the body. |
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annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, m, tree.pos()); |
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|
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if (tree.defaultValue != null) { |
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m.defaultValue = annotate.unfinishedDefaultValue(); // set it to temporary sentinel for now |
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annotate.annotateDefaultValueLater(tree.defaultValue, localEnv, m, tree.pos()); |
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} |
10 | 234 |
} |
235 |
||
236 |
/** Create a fresh environment for method bodies. |
|
237 |
* @param tree The method definition. |
|
238 |
* @param env The environment current outside of the method definition. |
|
239 |
*/ |
|
240 |
Env<AttrContext> methodEnv(JCMethodDecl tree, Env<AttrContext> env) { |
|
241 |
Env<AttrContext> localEnv = |
|
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env.dup(tree, env.info.dup(env.info.scope.dupUnshared(tree.sym))); |
10 | 243 |
localEnv.enclMethod = tree; |
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if (tree.sym.type != null) { |
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//when this is called in the enter stage, there's no type to be set |
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localEnv.info.returnResult = attr.new ResultInfo(KindSelector.VAL, |
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tree.sym.type.getReturnType()); |
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248 |
} |
10 | 249 |
if ((tree.mods.flags & STATIC) != 0) localEnv.info.staticLevel++; |
250 |
return localEnv; |
|
251 |
} |
|
252 |
||
253 |
public void visitVarDef(JCVariableDecl tree) { |
|
254 |
Env<AttrContext> localEnv = env; |
|
255 |
if ((tree.mods.flags & STATIC) != 0 || |
|
256 |
(env.info.scope.owner.flags() & INTERFACE) != 0) { |
|
257 |
localEnv = env.dup(tree, env.info.dup()); |
|
258 |
localEnv.info.staticLevel++; |
|
259 |
} |
|
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DiagnosticPosition prevLintPos = deferredLintHandler.setPos(tree.pos()); |
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261 |
|
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try { |
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if (TreeInfo.isEnumInit(tree)) { |
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attr.attribIdentAsEnumType(localEnv, (JCIdent)tree.vartype); |
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} else { |
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266 |
attr.attribType(tree.vartype, localEnv); |
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|
267 |
if (TreeInfo.isReceiverParam(tree)) |
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|
268 |
checkReceiver(tree, localEnv); |
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} |
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270 |
} finally { |
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271 |
deferredLintHandler.setPos(prevLintPos); |
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272 |
} |
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273 |
|
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274 |
if ((tree.mods.flags & VARARGS) != 0) { |
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275 |
//if we are entering a varargs parameter, we need to |
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|
276 |
//replace its type (a plain array type) with the more |
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|
277 |
//precise VarargsType --- we need to do it this way |
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278 |
//because varargs is represented in the tree as a |
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|
279 |
//modifier on the parameter declaration, and not as a |
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|
280 |
//distinct type of array node. |
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|
281 |
ArrayType atype = (ArrayType)tree.vartype.type; |
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|
282 |
tree.vartype.type = atype.makeVarargs(); |
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|
283 |
} |
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|
284 |
WriteableScope enclScope = enter.enterScope(env); |
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|
285 |
VarSymbol v = |
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|
286 |
new VarSymbol(0, tree.name, tree.vartype.type, enclScope.owner); |
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|
287 |
v.flags_field = chk.checkFlags(tree.pos(), tree.mods.flags, v, tree); |
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|
288 |
tree.sym = v; |
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|
289 |
if (tree.init != null) { |
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|
290 |
v.flags_field |= HASINIT; |
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|
291 |
if ((v.flags_field & FINAL) != 0 && |
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|
292 |
needsLazyConstValue(tree.init)) { |
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|
293 |
Env<AttrContext> initEnv = getInitEnv(tree, env); |
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|
294 |
initEnv.info.enclVar = v; |
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|
295 |
v.setLazyConstValue(initEnv(tree, initEnv), attr, tree); |
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|
296 |
} |
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|
297 |
} |
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|
298 |
if (chk.checkUnique(tree.pos(), v, enclScope)) { |
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|
299 |
chk.checkTransparentVar(tree.pos(), v, enclScope); |
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|
300 |
enclScope.enter(v); |
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|
301 |
} |
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changeset
|
302 |
|
27231
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|
303 |
annotate.annotateLater(tree.mods.annotations, localEnv, v, tree.pos()); |
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|
304 |
annotate.queueScanTreeAndTypeAnnotate(tree.vartype, localEnv, v, tree.pos()); |
26532
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changeset
|
305 |
|
27231
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changeset
|
306 |
v.pos = tree.pos; |
10 | 307 |
} |
17578 | 308 |
// where |
309 |
void checkType(JCTree tree, Type type, String diag) { |
|
310 |
if (!tree.type.isErroneous() && !types.isSameType(tree.type, type)) { |
|
311 |
log.error(tree, diag, type, tree.type); |
|
312 |
} |
|
313 |
} |
|
24903
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changeset
|
314 |
void checkReceiver(JCVariableDecl tree, Env<AttrContext> localEnv) { |
41e1812d6b4c
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|
315 |
attr.attribExpr(tree.nameexpr, localEnv); |
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|
316 |
MethodSymbol m = localEnv.enclMethod.sym; |
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diff
changeset
|
317 |
if (m.isConstructor()) { |
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diff
changeset
|
318 |
Type outertype = m.owner.owner.type; |
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changeset
|
319 |
if (outertype.hasTag(TypeTag.METHOD)) { |
41e1812d6b4c
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diff
changeset
|
320 |
// we have a local inner class |
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diff
changeset
|
321 |
outertype = m.owner.owner.owner.type; |
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changeset
|
322 |
} |
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|
323 |
if (outertype.hasTag(TypeTag.CLASS)) { |
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diff
changeset
|
324 |
checkType(tree.vartype, outertype, "incorrect.constructor.receiver.type"); |
41e1812d6b4c
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changeset
|
325 |
checkType(tree.nameexpr, outertype, "incorrect.constructor.receiver.name"); |
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changeset
|
326 |
} else { |
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changeset
|
327 |
log.error(tree, "receiver.parameter.not.applicable.constructor.toplevel.class"); |
41e1812d6b4c
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diff
changeset
|
328 |
} |
41e1812d6b4c
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diff
changeset
|
329 |
} else { |
41e1812d6b4c
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changeset
|
330 |
checkType(tree.vartype, m.owner.type, "incorrect.receiver.type"); |
41e1812d6b4c
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diff
changeset
|
331 |
checkType(tree.nameexpr, m.owner.type, "incorrect.receiver.name"); |
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diff
changeset
|
332 |
} |
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changeset
|
333 |
} |
10 | 334 |
|
19656
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|
335 |
public boolean needsLazyConstValue(JCTree tree) { |
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|
336 |
InitTreeVisitor initTreeVisitor = new InitTreeVisitor(); |
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|
337 |
tree.accept(initTreeVisitor); |
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|
338 |
return initTreeVisitor.result; |
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|
339 |
} |
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|
340 |
|
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|
341 |
/** Visitor class for expressions which might be constant expressions, |
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|
342 |
* as per JLS 15.28 (Constant Expressions). |
19656
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|
343 |
*/ |
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|
344 |
static class InitTreeVisitor extends JCTree.Visitor { |
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|
345 |
|
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|
346 |
private static final Set<Tag> ALLOWED_OPERATORS = |
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|
347 |
EnumSet.of(Tag.POS, Tag.NEG, Tag.NOT, Tag.COMPL, Tag.PLUS, Tag.MINUS, |
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|
348 |
Tag.MUL, Tag.DIV, Tag.MOD, Tag.SL, Tag.SR, Tag.USR, |
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|
349 |
Tag.LT, Tag.LE, Tag.GT, Tag.GE, Tag.EQ, Tag.NE, |
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|
350 |
Tag.BITAND, Tag.BITXOR, Tag.BITOR, Tag.AND, Tag.OR); |
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|
351 |
|
19656
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|
352 |
private boolean result = true; |
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|
353 |
|
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|
354 |
@Override |
30064
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|
355 |
public void visitTree(JCTree tree) { |
19656
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|
356 |
result = false; |
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|
357 |
} |
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|
358 |
|
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|
359 |
@Override |
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|
360 |
public void visitLiteral(JCLiteral that) {} |
19942
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|
361 |
|
e9dae0e41075
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|
362 |
@Override |
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|
363 |
public void visitTypeCast(JCTypeCast tree) { |
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|
364 |
tree.expr.accept(this); |
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|
365 |
} |
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|
366 |
|
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|
367 |
@Override |
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|
368 |
public void visitUnary(JCUnary that) { |
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|
369 |
if (!ALLOWED_OPERATORS.contains(that.getTag())) { |
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|
370 |
result = false; |
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|
371 |
return ; |
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|
372 |
} |
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that.arg.accept(this); |
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374 |
} |
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375 |
|
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376 |
@Override |
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377 |
public void visitBinary(JCBinary that) { |
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378 |
if (!ALLOWED_OPERATORS.contains(that.getTag())) { |
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379 |
result = false; |
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380 |
return ; |
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381 |
} |
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382 |
that.lhs.accept(this); |
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383 |
that.rhs.accept(this); |
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384 |
} |
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385 |
|
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386 |
@Override |
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387 |
public void visitConditional(JCConditional tree) { |
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388 |
tree.cond.accept(this); |
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389 |
tree.truepart.accept(this); |
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390 |
tree.falsepart.accept(this); |
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|
391 |
} |
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|
392 |
|
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393 |
@Override |
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394 |
public void visitParens(JCParens tree) { |
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395 |
tree.expr.accept(this); |
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396 |
} |
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|
397 |
|
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398 |
@Override |
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399 |
public void visitIdent(JCIdent that) {} |
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|
400 |
|
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|
401 |
@Override |
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402 |
public void visitSelect(JCFieldAccess tree) { |
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403 |
tree.selected.accept(this); |
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404 |
} |
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405 |
} |
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406 |
|
10 | 407 |
/** Create a fresh environment for a variable's initializer. |
408 |
* If the variable is a field, the owner of the environment's scope |
|
409 |
* is be the variable itself, otherwise the owner is the method |
|
410 |
* enclosing the variable definition. |
|
411 |
* |
|
412 |
* @param tree The variable definition. |
|
413 |
* @param env The environment current outside of the variable definition. |
|
414 |
*/ |
|
415 |
Env<AttrContext> initEnv(JCVariableDecl tree, Env<AttrContext> env) { |
|
416 |
Env<AttrContext> localEnv = env.dupto(new AttrContextEnv(tree, env.info.dup())); |
|
417 |
if (tree.sym.owner.kind == TYP) { |
|
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localEnv.info.scope = env.info.scope.dupUnshared(tree.sym); |
10 | 419 |
} |
420 |
if ((tree.mods.flags & STATIC) != 0 || |
|
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421 |
((env.enclClass.sym.flags() & INTERFACE) != 0 && env.enclMethod == null)) |
10 | 422 |
localEnv.info.staticLevel++; |
423 |
return localEnv; |
|
424 |
} |
|
425 |
||
426 |
/** Default member enter visitor method: do nothing |
|
427 |
*/ |
|
428 |
public void visitTree(JCTree tree) { |
|
429 |
} |
|
430 |
||
431 |
public void visitErroneous(JCErroneous tree) { |
|
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432 |
if (tree.errs != null) |
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433 |
memberEnter(tree.errs, env); |
10 | 434 |
} |
435 |
||
436 |
public Env<AttrContext> getMethodEnv(JCMethodDecl tree, Env<AttrContext> env) { |
|
437 |
Env<AttrContext> mEnv = methodEnv(tree, env); |
|
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438 |
mEnv.info.lint = mEnv.info.lint.augment(tree.sym); |
10 | 439 |
for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail) |
440 |
mEnv.info.scope.enterIfAbsent(l.head.type.tsym); |
|
441 |
for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) |
|
442 |
mEnv.info.scope.enterIfAbsent(l.head.sym); |
|
443 |
return mEnv; |
|
444 |
} |
|
445 |
||
446 |
public Env<AttrContext> getInitEnv(JCVariableDecl tree, Env<AttrContext> env) { |
|
447 |
Env<AttrContext> iEnv = initEnv(tree, env); |
|
448 |
return iEnv; |
|
449 |
} |
|
450 |
} |