/*
* Copyright (c) 2010, 2011, 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 6199075
*
* @summary Unambiguous varargs method calls flagged as ambiguous
* @author mcimadamore
*
*/
import com.sun.source.util.JavacTask;
import com.sun.tools.classfile.Instruction;
import com.sun.tools.classfile.Attribute;
import com.sun.tools.classfile.ClassFile;
import com.sun.tools.classfile.Code_attribute;
import com.sun.tools.classfile.ConstantPool.*;
import com.sun.tools.classfile.Method;
import com.sun.tools.javac.api.JavacTool;
import com.sun.tools.javac.util.List;
import java.io.File;
import java.net.URI;
import java.util.Arrays;
import java.util.Locale;
import javax.tools.Diagnostic;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileObject;
import javax.tools.SimpleJavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.ToolProvider;
public class T6199075 {
int checkCount = 0;
int bytecodeCheckCount = 0;
enum TypeKind {
BYTE("byte", "(byte)1", "[B", 0),
CHAR("char", "'c'", "[C", 1),
SHORT("short", "(short)1", "[S", 2),
INT("int", "1", "[I", 3),
LONG("long", "1L", "[J", 4),
FLOAT("float", "1.0F", "[F", 5),
DOUBLE("double", "1.0D", "[D", 6),
BOOLEAN("boolean", "true", "[Z", -1);
String typeString;
String valueString;
String bytecodeString;
private int subtypeTag;
TypeKind(String typeString, String valueString, String bytecodeString, int subtypeTag) {
this.typeString = typeString;
this.valueString = valueString;
this.bytecodeString = bytecodeString;
this.subtypeTag = subtypeTag;
}
boolean isSubtypeOf(TypeKind that) {
switch (this) {
case BOOLEAN:
return that == BOOLEAN;
case BYTE:
case CHAR:
return this.subtypeTag == that.subtypeTag ||
this.subtypeTag + 2 <= that.subtypeTag;
default:
return this.subtypeTag <= that.subtypeTag;
}
}
}
enum ArgumentsArity {
ZERO(0),
ONE(1),
TWO(2),
THREE(3);
int arity;
ArgumentsArity(int arity) {
this.arity = arity;
}
String asExpressionList(TypeKind type) {
StringBuilder buf = new StringBuilder();
String sep = "";
for (int i = 0; i < arity; i++) {
buf.append(sep);
buf.append(type.valueString);
sep = ",";
}
return buf.toString();
}
}
static class VarargsMethod {
TypeKind varargsElement;
VarargsMethod(TypeKind varargsElement) {
this.varargsElement = varargsElement;
}
@Override
public String toString() {
return "void m("+ varargsElement.typeString+ "... args) {}";
}
boolean isApplicable(TypeKind actual, ArgumentsArity argsArity) {
return argsArity == ArgumentsArity.ZERO ||
actual.isSubtypeOf(varargsElement);
}
boolean isMoreSpecificThan(VarargsMethod that) {
return varargsElement.isSubtypeOf(that.varargsElement);
}
}
public static void main(String... args) throws Exception {
new T6199075().test();
}
void test() throws Exception {
for (TypeKind formal1 : TypeKind.values()) {
VarargsMethod m1 = new VarargsMethod(formal1);
for (TypeKind formal2 : TypeKind.values()) {
VarargsMethod m2 = new VarargsMethod(formal2);
for (TypeKind actual : TypeKind.values()) {
for (ArgumentsArity argsArity : ArgumentsArity.values()) {
compileAndCheck(m1, m2, actual, argsArity);
}
}
}
}
System.out.println("Total checks made: " + checkCount);
System.out.println("Bytecode checks made: " + bytecodeCheckCount);
}
// Create a single file manager and reuse it for each compile to save time.
StandardJavaFileManager fm = JavacTool.create().getStandardFileManager(null, null, null);
void compileAndCheck(VarargsMethod m1, VarargsMethod m2, TypeKind actual, ArgumentsArity argsArity) throws Exception {
final JavaCompiler tool = ToolProvider.getSystemJavaCompiler();
JavaSource source = new JavaSource(m1, m2, actual, argsArity);
ErrorChecker ec = new ErrorChecker();
JavacTask ct = (JavacTask)tool.getTask(null, fm, ec,
null, null, Arrays.asList(source));
ct.generate();
check(source, ec, m1, m2, actual, argsArity);
}
void check(JavaSource source, ErrorChecker ec, VarargsMethod m1, VarargsMethod m2, TypeKind actual, ArgumentsArity argsArity) {
checkCount++;
boolean resolutionError = false;
VarargsMethod selectedMethod = null;
boolean m1_applicable = m1.isApplicable(actual, argsArity);
boolean m2_applicable = m2.isApplicable(actual, argsArity);
if (!m1_applicable && !m2_applicable) {
resolutionError = true;
} else if (m1_applicable && m2_applicable) {
//most specific
boolean m1_moreSpecific = m1.isMoreSpecificThan(m2);
boolean m2_moreSpecific = m2.isMoreSpecificThan(m1);
resolutionError = m1_moreSpecific == m2_moreSpecific;
selectedMethod = m1_moreSpecific ? m1 : m2;
} else {
selectedMethod = m1_applicable ?
m1 : m2;
}
if (ec.errorFound != resolutionError) {
throw new Error("invalid diagnostics for source:\n" +
source.getCharContent(true) +
"\nExpected resolution error: " + resolutionError +
"\nFound error: " + ec.errorFound +
"\nCompiler diagnostics:\n" + ec.printDiags());
} else if (!resolutionError) {
verifyBytecode(selectedMethod);
}
}
void verifyBytecode(VarargsMethod selected) {
bytecodeCheckCount++;
File compiledTest = new File("Test.class");
try {
ClassFile cf = ClassFile.read(compiledTest);
Method testMethod = null;
for (Method m : cf.methods) {
if (m.getName(cf.constant_pool).equals("test")) {
testMethod = m;
break;
}
}
if (testMethod == null) {
throw new Error("Test method not found");
}
Code_attribute ea = (Code_attribute)testMethod.attributes.get(Attribute.Code);
if (testMethod == null) {
throw new Error("Code attribute for test() method not found");
}
for (Instruction i : ea.getInstructions()) {
if (i.getMnemonic().equals("invokevirtual")) {
int cp_entry = i.getUnsignedShort(1);
CONSTANT_Methodref_info methRef =
(CONSTANT_Methodref_info)cf.constant_pool.get(cp_entry);
String type = methRef.getNameAndTypeInfo().getType();
if (!type.contains(selected.varargsElement.bytecodeString)) {
throw new Error("Unexpected type method call: " + type);
}
break;
}
}
} catch (Exception e) {
e.printStackTrace();
throw new Error("error reading " + compiledTest +": " + e);
}
}
static class JavaSource extends SimpleJavaFileObject {
static final String source_template = "class Test {\n" +
" #V1\n" +
" #V2\n" +
" void test() { m(#E); }\n" +
"}";
String source;
public JavaSource(VarargsMethod m1, VarargsMethod m2, TypeKind actual, ArgumentsArity argsArity) {
super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);
source = source_template.replaceAll("#V1", m1.toString()).
replaceAll("#V2", m2.toString()).
replaceAll("#E", argsArity.asExpressionList(actual));
}
@Override
public CharSequence getCharContent(boolean ignoreEncodingErrors) {
return source;
}
}
static class ErrorChecker implements javax.tools.DiagnosticListener<JavaFileObject> {
boolean errorFound;
List<String> errDiags = List.nil();
public void report(Diagnostic<? extends JavaFileObject> diagnostic) {
if (diagnostic.getKind() == Diagnostic.Kind.ERROR) {
errDiags = errDiags.append(diagnostic.getMessage(Locale.getDefault()));
errorFound = true;
}
}
String printDiags() {
StringBuilder buf = new StringBuilder();
for (String s : errDiags) {
buf.append(s);
buf.append("\n");
}
return buf.toString();
}
}
}