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/*
* Copyright (c) 2016, 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.
*
* 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.
*/
/*
* @test
* @bug 8159970
* @summary javac, JLS8 18.2.4 is not completely implemented by the compiler
* @library /tools/lib/types
* @modules jdk.compiler/com.sun.tools.javac.api
* jdk.compiler/com.sun.tools.javac.main
* jdk.compiler/com.sun.tools.javac.code
* jdk.compiler/com.sun.tools.javac.comp
* jdk.compiler/com.sun.tools.javac.tree
* jdk.compiler/com.sun.tools.javac.util
* jdk.compiler/com.sun.tools.javac.file
* @build TypeHarness
* @run main TypeEqualityInInferenceTest
*/
import java.util.ArrayList;
import java.util.List;
import com.sun.tools.javac.code.Type;
import com.sun.tools.javac.code.Type.UndetVar;
import com.sun.tools.javac.code.Type.UndetVar.InferenceBound;
import com.sun.tools.javac.util.Assert;
public class TypeEqualityInInferenceTest extends TypeHarness {
StrToTypeFactory strToTypeFactory;
public static void main(String... args) throws Exception {
new TypeEqualityInInferenceTest().runAll();
}
void runAll() {
List<String> imports = new ArrayList<>();
imports.add("java.util.*");
List<String> typeVars = new ArrayList<>();
typeVars.add("T");
strToTypeFactory = new StrToTypeFactory(null, imports, typeVars);
runTest("List<? extends T>", "List<? extends String>", predef.stringType);
runTest("List<? extends T>", "List<?>", predef.objectType);
runTest("List<? super T>", "List<? super String>", predef.stringType);
}
void runTest(String freeTypeStr, String typeStr, Type equalityBoundType) {
Type freeType = strToTypeFactory.getType(freeTypeStr);
Type aType = strToTypeFactory.getType(typeStr);
withInferenceContext(strToTypeFactory.getTypeVars(), inferenceContext -> {
assertSameType(inferenceContext.asUndetVar(freeType), aType);
UndetVar undetVarForT = (UndetVar)inferenceContext.undetVars().head;
checkEqualityBound(undetVarForT, equalityBoundType);
});
withInferenceContext(strToTypeFactory.getTypeVars(), inferenceContext -> {
assertSameType(aType, inferenceContext.asUndetVar(freeType));
UndetVar undetVarForT = (UndetVar)inferenceContext.undetVars().head;
checkEqualityBound(undetVarForT, equalityBoundType);
});
}
void checkEqualityBound(UndetVar uv, Type boundType) {
com.sun.tools.javac.util.List<Type> equalBounds = uv.getBounds(InferenceBound.EQ);
Assert.check(!equalBounds.isEmpty() && equalBounds.length() == 1,
"undetVar must have only one equality bound");
Type bound = equalBounds.head;
Assert.check(bound == boundType, "equal bound must be of type " + boundType);
}
}
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