aoqi@0: /*
aoqi@0:  * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: /*
aoqi@0:  * @test
aoqi@0:  * @bug 7194586 8003280 8006694 8010404
aoqi@0:  * @summary Add lambda tests
aoqi@0:  *  Add back-end support for invokedynamic
aoqi@0:  *  temporarily workaround combo tests are causing time out in several platforms
aoqi@0:  * @library ../lib
aoqi@0:  * @build JavacTestingAbstractThreadedTest
aoqi@0:  * @run main/othervm TestInvokeDynamic
aoqi@0:  */
aoqi@0: 
aoqi@0: // use /othervm to avoid jtreg timeout issues (CODETOOLS-7900047)
aoqi@0: // see JDK-8006746
aoqi@0: 
aoqi@0: import java.io.File;
aoqi@0: import java.net.URI;
aoqi@0: import java.util.ArrayList;
aoqi@0: import java.util.Arrays;
aoqi@0: import java.util.Locale;
aoqi@0: 
aoqi@0: import javax.tools.Diagnostic;
aoqi@0: import javax.tools.JavaFileObject;
aoqi@0: import javax.tools.SimpleJavaFileObject;
aoqi@0: 
aoqi@0: import com.sun.source.tree.MethodInvocationTree;
aoqi@0: import com.sun.source.tree.MethodTree;
aoqi@0: import com.sun.source.util.TaskEvent;
aoqi@0: import com.sun.source.util.TaskListener;
aoqi@0: import com.sun.source.util.TreeScanner;
aoqi@0: 
aoqi@0: import com.sun.tools.classfile.Attribute;
aoqi@0: import com.sun.tools.classfile.BootstrapMethods_attribute;
aoqi@0: import com.sun.tools.classfile.ClassFile;
aoqi@0: import com.sun.tools.classfile.Code_attribute;
aoqi@0: import com.sun.tools.classfile.ConstantPool.*;
aoqi@0: import com.sun.tools.classfile.Instruction;
aoqi@0: import com.sun.tools.classfile.LineNumberTable_attribute;
aoqi@0: import com.sun.tools.classfile.Method;
aoqi@0: 
aoqi@0: import com.sun.tools.javac.api.JavacTaskImpl;
aoqi@0: import com.sun.tools.javac.code.Symbol;
aoqi@0: import com.sun.tools.javac.code.Symbol.MethodSymbol;
aoqi@0: import com.sun.tools.javac.code.Symtab;
aoqi@0: import com.sun.tools.javac.code.Types;
aoqi@0: import com.sun.tools.javac.jvm.Pool;
aoqi@0: import com.sun.tools.javac.tree.JCTree.JCMethodInvocation;
aoqi@0: import com.sun.tools.javac.tree.JCTree.JCMethodDecl;
aoqi@0: import com.sun.tools.javac.tree.JCTree.JCIdent;
aoqi@0: import com.sun.tools.javac.util.Context;
aoqi@0: import com.sun.tools.javac.util.Names;
aoqi@0: 
aoqi@0: import static com.sun.tools.javac.jvm.ClassFile.*;
aoqi@0: 
aoqi@0: public class TestInvokeDynamic
aoqi@0:     extends JavacTestingAbstractThreadedTest
aoqi@0:     implements Runnable {
aoqi@0: 
aoqi@0:     enum StaticArgumentKind {
aoqi@0:         STRING("Hello!", "String", "Ljava/lang/String;") {
aoqi@0:             @Override
aoqi@0:             boolean check(CPInfo cpInfo) throws Exception {
aoqi@0:                 return (cpInfo instanceof CONSTANT_String_info) &&
aoqi@0:                         ((CONSTANT_String_info)cpInfo).getString()
aoqi@0:                         .equals(value);
aoqi@0:             }
aoqi@0:         },
aoqi@0:         CLASS(null, "Class<?>", "Ljava/lang/Class;") {
aoqi@0:             @Override
aoqi@0:             boolean check(CPInfo cpInfo) throws Exception {
aoqi@0:                 return (cpInfo instanceof CONSTANT_Class_info) &&
aoqi@0:                         ((CONSTANT_Class_info)cpInfo).getName()
aoqi@0:                         .equals("java/lang/String");
aoqi@0:             }
aoqi@0:         },
aoqi@0:         INTEGER(1, "int", "I") {
aoqi@0:             @Override
aoqi@0:             boolean check(CPInfo cpInfo) throws Exception {
aoqi@0:                 return (cpInfo instanceof CONSTANT_Integer_info) &&
aoqi@0:                         ((CONSTANT_Integer_info)cpInfo).value ==
aoqi@0:                         ((Integer)value).intValue();
aoqi@0:             }
aoqi@0:         },
aoqi@0:         LONG(1L, "long", "J") {
aoqi@0:             @Override
aoqi@0:             boolean check(CPInfo cpInfo) throws Exception {
aoqi@0:                 return (cpInfo instanceof CONSTANT_Long_info) &&
aoqi@0:                         ((CONSTANT_Long_info)cpInfo).value ==
aoqi@0:                         ((Long)value).longValue();
aoqi@0:             }
aoqi@0:         },
aoqi@0:         FLOAT(1.0f, "float", "F") {
aoqi@0:             @Override
aoqi@0:             boolean check(CPInfo cpInfo) throws Exception {
aoqi@0:                 return (cpInfo instanceof CONSTANT_Float_info) &&
aoqi@0:                         ((CONSTANT_Float_info)cpInfo).value ==
aoqi@0:                         ((Float)value).floatValue();
aoqi@0:             }
aoqi@0:         },
aoqi@0:         DOUBLE(1.0, "double","D") {
aoqi@0:             @Override
aoqi@0:             boolean check(CPInfo cpInfo) throws Exception {
aoqi@0:                 return (cpInfo instanceof CONSTANT_Double_info) &&
aoqi@0:                         ((CONSTANT_Double_info)cpInfo).value ==
aoqi@0:                         ((Double)value).doubleValue();
aoqi@0:             }
aoqi@0:         },
aoqi@0:         METHOD_HANDLE(null, "MethodHandle", "Ljava/lang/invoke/MethodHandle;") {
aoqi@0:             @Override
aoqi@0:             boolean check(CPInfo cpInfo) throws Exception {
aoqi@0:                 if (!(cpInfo instanceof CONSTANT_MethodHandle_info))
aoqi@0:                     return false;
aoqi@0:                 CONSTANT_MethodHandle_info handleInfo =
aoqi@0:                         (CONSTANT_MethodHandle_info)cpInfo;
aoqi@0:                 return handleInfo.getCPRefInfo().getClassName().equals("Array") &&
aoqi@0:                         handleInfo.reference_kind == RefKind.REF_invokeVirtual &&
aoqi@0:                         handleInfo.getCPRefInfo()
aoqi@0:                         .getNameAndTypeInfo().getName().equals("clone") &&
aoqi@0:                         handleInfo.getCPRefInfo()
aoqi@0:                         .getNameAndTypeInfo().getType().equals("()Ljava/lang/Object;");
aoqi@0:             }
aoqi@0:         },
aoqi@0:         METHOD_TYPE(null, "MethodType", "Ljava/lang/invoke/MethodType;") {
aoqi@0:             @Override
aoqi@0:             boolean check(CPInfo cpInfo) throws Exception {
aoqi@0:                 return (cpInfo instanceof CONSTANT_MethodType_info) &&
aoqi@0:                         ((CONSTANT_MethodType_info)cpInfo).getType()
aoqi@0:                         .equals("()Ljava/lang/Object;");
aoqi@0:             }
aoqi@0:         };
aoqi@0: 
aoqi@0:         Object value;
aoqi@0:         String sourceTypeStr;
aoqi@0:         String bytecodeTypeStr;
aoqi@0: 
aoqi@0:         StaticArgumentKind(Object value, String sourceTypeStr,
aoqi@0:                 String bytecodeTypeStr) {
aoqi@0:             this.value = value;
aoqi@0:             this.sourceTypeStr = sourceTypeStr;
aoqi@0:             this.bytecodeTypeStr = bytecodeTypeStr;
aoqi@0:         }
aoqi@0: 
aoqi@0:         abstract boolean check(CPInfo cpInfo) throws Exception;
aoqi@0: 
aoqi@0:         Object getValue(Symtab syms, Names names, Types types) {
aoqi@0:             switch (this) {
aoqi@0:                 case STRING:
aoqi@0:                 case INTEGER:
aoqi@0:                 case LONG:
aoqi@0:                 case FLOAT:
aoqi@0:                 case DOUBLE:
aoqi@0:                     return value;
aoqi@0:                 case CLASS:
aoqi@0:                     return syms.stringType.tsym;
aoqi@0:                 case METHOD_HANDLE:
aoqi@0:                     return new Pool.MethodHandle(REF_invokeVirtual,
aoqi@0:                             syms.arrayCloneMethod, types);
aoqi@0:                 case METHOD_TYPE:
aoqi@0:                     return syms.arrayCloneMethod.type;
aoqi@0:                 default:
aoqi@0:                     throw new AssertionError();
aoqi@0:             }
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     enum StaticArgumentsArity {
aoqi@0:         ZERO(0),
aoqi@0:         ONE(1),
aoqi@0:         TWO(2),
aoqi@0:         THREE(3);
aoqi@0: 
aoqi@0:         int arity;
aoqi@0: 
aoqi@0:         StaticArgumentsArity(int arity) {
aoqi@0:             this.arity = arity;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     public static void main(String... args) throws Exception {
aoqi@0:         for (StaticArgumentsArity arity : StaticArgumentsArity.values()) {
aoqi@0:             if (arity.arity == 0) {
aoqi@0:                 pool.execute(new TestInvokeDynamic(arity));
aoqi@0:             } else {
aoqi@0:                 for (StaticArgumentKind sak1 : StaticArgumentKind.values()) {
aoqi@0:                     if (arity.arity == 1) {
aoqi@0:                         pool.execute(new TestInvokeDynamic(arity, sak1));
aoqi@0:                     } else {
aoqi@0:                         for (StaticArgumentKind sak2 : StaticArgumentKind.values()) {
aoqi@0:                             if (arity.arity == 2) {
aoqi@0:                                 pool.execute(new TestInvokeDynamic(arity, sak1, sak2));
aoqi@0:                             } else {
aoqi@0:                                 for (StaticArgumentKind sak3 : StaticArgumentKind.values()) {
aoqi@0:                                     pool.execute(
aoqi@0:                                         new TestInvokeDynamic(arity, sak1, sak2, sak3));
aoqi@0:                                 }
aoqi@0:                             }
aoqi@0:                         }
aoqi@0:                     }
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         checkAfterExec();
aoqi@0:     }
aoqi@0: 
aoqi@0:     StaticArgumentsArity arity;
aoqi@0:     StaticArgumentKind[] saks;
aoqi@0:     DiagChecker dc;
aoqi@0: 
aoqi@0:     TestInvokeDynamic(StaticArgumentsArity arity, StaticArgumentKind... saks) {
aoqi@0:         this.arity = arity;
aoqi@0:         this.saks = saks;
aoqi@0:         dc = new DiagChecker();
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void run() {
aoqi@0:         int id = checkCount.incrementAndGet();
aoqi@0:         JavaSource source = new JavaSource(id);
aoqi@0:         JavacTaskImpl ct = (JavacTaskImpl)comp.getTask(null, fm.get(), dc,
aoqi@0:                 Arrays.asList("-g"), null, Arrays.asList(source));
aoqi@0:         Context context = ct.getContext();
aoqi@0:         Symtab syms = Symtab.instance(context);
aoqi@0:         Names names = Names.instance(context);
aoqi@0:         Types types = Types.instance(context);
aoqi@0:         ct.addTaskListener(new Indifier(syms, names, types));
aoqi@0:         try {
aoqi@0:             ct.generate();
aoqi@0:         } catch (Throwable t) {
aoqi@0:             t.printStackTrace();
aoqi@0:             throw new AssertionError(
aoqi@0:                     String.format("Error thrown when compiling following code\n%s",
aoqi@0:                     source.source));
aoqi@0:         }
aoqi@0:         if (dc.diagFound) {
aoqi@0:             throw new AssertionError(
aoqi@0:                     String.format("Diags found when compiling following code\n%s\n\n%s",
aoqi@0:                     source.source, dc.printDiags()));
aoqi@0:         }
aoqi@0:         verifyBytecode(id);
aoqi@0:     }
aoqi@0: 
aoqi@0:     void verifyBytecode(int id) {
aoqi@0:         File compiledTest = new File(String.format("Test%d.class", id));
aoqi@0:         try {
aoqi@0:             ClassFile cf = ClassFile.read(compiledTest);
aoqi@0:             Method testMethod = null;
aoqi@0:             for (Method m : cf.methods) {
aoqi@0:                 if (m.getName(cf.constant_pool).equals("test")) {
aoqi@0:                     testMethod = m;
aoqi@0:                     break;
aoqi@0:                 }
aoqi@0:             }
aoqi@0:             if (testMethod == null) {
aoqi@0:                 throw new Error("Test method not found");
aoqi@0:             }
aoqi@0:             Code_attribute ea =
aoqi@0:                     (Code_attribute)testMethod.attributes.get(Attribute.Code);
aoqi@0:             if (testMethod == null) {
aoqi@0:                 throw new Error("Code attribute for test() method not found");
aoqi@0:             }
aoqi@0: 
aoqi@0:             int bsmIdx = -1;
aoqi@0: 
aoqi@0:             for (Instruction i : ea.getInstructions()) {
aoqi@0:                 if (i.getMnemonic().equals("invokedynamic")) {
aoqi@0:                     CONSTANT_InvokeDynamic_info indyInfo =
aoqi@0:                          (CONSTANT_InvokeDynamic_info)cf
aoqi@0:                             .constant_pool.get(i.getShort(1));
aoqi@0:                     bsmIdx = indyInfo.bootstrap_method_attr_index;
aoqi@0:                     if (!indyInfo.getNameAndTypeInfo().getType().equals("()V")) {
aoqi@0:                         throw new
aoqi@0:                             AssertionError("type mismatch for CONSTANT_InvokeDynamic_info");
aoqi@0:                     }
aoqi@0:                 }
aoqi@0:             }
aoqi@0:             if (bsmIdx == -1) {
aoqi@0:                 throw new Error("Missing invokedynamic in generated code");
aoqi@0:             }
aoqi@0: 
aoqi@0:             BootstrapMethods_attribute bsm_attr =
aoqi@0:                     (BootstrapMethods_attribute)cf
aoqi@0:                     .getAttribute(Attribute.BootstrapMethods);
aoqi@0:             if (bsm_attr.bootstrap_method_specifiers.length != 1) {
aoqi@0:                 throw new Error("Bad number of method specifiers " +
aoqi@0:                         "in BootstrapMethods attribute");
aoqi@0:             }
aoqi@0:             BootstrapMethods_attribute.BootstrapMethodSpecifier bsm_spec =
aoqi@0:                     bsm_attr.bootstrap_method_specifiers[0];
aoqi@0: 
aoqi@0:             if (bsm_spec.bootstrap_arguments.length != arity.arity) {
aoqi@0:                 throw new Error("Bad number of static invokedynamic args " +
aoqi@0:                         "in BootstrapMethod attribute");
aoqi@0:             }
aoqi@0: 
aoqi@0:             int count = 0;
aoqi@0:             for (StaticArgumentKind sak : saks) {
aoqi@0:                 if (!sak.check(cf.constant_pool
aoqi@0:                         .get(bsm_spec.bootstrap_arguments[count]))) {
aoqi@0:                     throw new Error("Bad static argument value " + sak);
aoqi@0:                 }
aoqi@0:                 count++;
aoqi@0:             }
aoqi@0: 
aoqi@0:             CONSTANT_MethodHandle_info bsm_handle =
aoqi@0:                     (CONSTANT_MethodHandle_info)cf.constant_pool
aoqi@0:                     .get(bsm_spec.bootstrap_method_ref);
aoqi@0: 
aoqi@0:             if (bsm_handle.reference_kind != RefKind.REF_invokeStatic) {
aoqi@0:                 throw new Error("Bad kind on boostrap method handle");
aoqi@0:             }
aoqi@0: 
aoqi@0:             CONSTANT_Methodref_info bsm_ref =
aoqi@0:                     (CONSTANT_Methodref_info)cf.constant_pool
aoqi@0:                     .get(bsm_handle.reference_index);
aoqi@0: 
aoqi@0:             if (!bsm_ref.getClassInfo().getName().equals("Bootstrap")) {
aoqi@0:                 throw new Error("Bad owner of boostrap method");
aoqi@0:             }
aoqi@0: 
aoqi@0:             if (!bsm_ref.getNameAndTypeInfo().getName().equals("bsm")) {
aoqi@0:                 throw new Error("Bad boostrap method name");
aoqi@0:             }
aoqi@0: 
aoqi@0:             if (!bsm_ref.getNameAndTypeInfo()
aoqi@0:                     .getType().equals(asBSMSignatureString())) {
aoqi@0:                 throw new Error("Bad boostrap method type" +
aoqi@0:                         bsm_ref.getNameAndTypeInfo().getType() + " " +
aoqi@0:                         asBSMSignatureString());
aoqi@0:             }
aoqi@0: 
aoqi@0:             LineNumberTable_attribute lnt =
aoqi@0:                     (LineNumberTable_attribute)ea.attributes.get(Attribute.LineNumberTable);
aoqi@0: 
aoqi@0:             if (lnt == null) {
aoqi@0:                 throw new Error("No LineNumberTable attribute");
aoqi@0:             }
aoqi@0:             if (lnt.line_number_table_length != 3) {
aoqi@0:                 throw new Error("Wrong number of entries in LineNumberTable");
aoqi@0:             }
aoqi@0:         } catch (Exception e) {
aoqi@0:             e.printStackTrace();
aoqi@0:             throw new Error("error reading " + compiledTest +": " + e);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     String asBSMSignatureString() {
aoqi@0:         StringBuilder buf = new StringBuilder();
aoqi@0:         buf.append("(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;");
aoqi@0:         for (StaticArgumentKind sak : saks) {
aoqi@0:             buf.append(sak.bytecodeTypeStr);
aoqi@0:         }
aoqi@0:         buf.append(")Ljava/lang/invoke/CallSite;");
aoqi@0:         return buf.toString();
aoqi@0:     }
aoqi@0: 
aoqi@0:     class JavaSource extends SimpleJavaFileObject {
aoqi@0: 
aoqi@0:         static final String source_template = "import java.lang.invoke.*;\n" +
aoqi@0:                 "class Bootstrap {\n" +
aoqi@0:                 "   public static CallSite bsm(MethodHandles.Lookup lookup, " +
aoqi@0:                 "String name, MethodType methodType #SARGS) {\n" +
aoqi@0:                 "       return null;\n" +
aoqi@0:                 "   }\n" +
aoqi@0:                 "}\n" +
aoqi@0:                 "class Test#ID {\n" +
aoqi@0:                 "   void m() { }\n" +
aoqi@0:                 "   void test() {\n" +
aoqi@0:                 "      Object o = this; // marker statement \n" +
aoqi@0:                 "      m();\n" +
aoqi@0:                 "   }\n" +
aoqi@0:                 "}";
aoqi@0: 
aoqi@0:         String source;
aoqi@0: 
aoqi@0:         JavaSource(int id) {
aoqi@0:             super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);
aoqi@0:             source = source_template.replace("#SARGS", asSignatureString())
aoqi@0:                     .replace("#ID", String.valueOf(id));
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public CharSequence getCharContent(boolean ignoreEncodingErrors) {
aoqi@0:             return source;
aoqi@0:         }
aoqi@0: 
aoqi@0:         String asSignatureString() {
aoqi@0:             int count = 0;
aoqi@0:             StringBuilder buf = new StringBuilder();
aoqi@0:             for (StaticArgumentKind sak : saks) {
aoqi@0:                 buf.append(",");
aoqi@0:                 buf.append(sak.sourceTypeStr);
aoqi@0:                 buf.append(' ');
aoqi@0:                 buf.append(String.format("x%d", count++));
aoqi@0:             }
aoqi@0:             return buf.toString();
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     class Indifier extends TreeScanner<Void, Void> implements TaskListener {
aoqi@0: 
aoqi@0:         MethodSymbol bsm;
aoqi@0:         Symtab syms;
aoqi@0:         Names names;
aoqi@0:         Types types;
aoqi@0: 
aoqi@0:         Indifier(Symtab syms, Names names, Types types) {
aoqi@0:             this.syms = syms;
aoqi@0:             this.names = names;
aoqi@0:             this.types = types;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public void started(TaskEvent e) {
aoqi@0:             //do nothing
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public void finished(TaskEvent e) {
aoqi@0:             if (e.getKind() == TaskEvent.Kind.ANALYZE) {
aoqi@0:                 scan(e.getCompilationUnit(), null);
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public Void visitMethodInvocation(MethodInvocationTree node, Void p) {
aoqi@0:             super.visitMethodInvocation(node, p);
aoqi@0:             JCMethodInvocation apply = (JCMethodInvocation)node;
aoqi@0:             JCIdent ident = (JCIdent)apply.meth;
aoqi@0:             Symbol oldSym = ident.sym;
aoqi@0:             if (!oldSym.isConstructor()) {
aoqi@0:                 Object[] staticArgs = new Object[arity.arity];
aoqi@0:                 for (int i = 0; i < arity.arity ; i++) {
aoqi@0:                     staticArgs[i] = saks[i].getValue(syms, names, types);
aoqi@0:                 }
aoqi@0:                 ident.sym = new Symbol.DynamicMethodSymbol(oldSym.name,
aoqi@0:                         oldSym.owner, REF_invokeStatic, bsm, oldSym.type, staticArgs);
aoqi@0:             }
aoqi@0:             return null;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public Void visitMethod(MethodTree node, Void p) {
aoqi@0:             super.visitMethod(node, p);
aoqi@0:             if (node.getName().toString().equals("bsm")) {
aoqi@0:                 bsm = ((JCMethodDecl)node).sym;
aoqi@0:             }
aoqi@0:             return null;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     static class DiagChecker
aoqi@0:         implements javax.tools.DiagnosticListener<JavaFileObject> {
aoqi@0: 
aoqi@0:         boolean diagFound;
aoqi@0:         ArrayList<String> diags = new ArrayList<>();
aoqi@0: 
aoqi@0:         public void report(Diagnostic<? extends JavaFileObject> diagnostic) {
aoqi@0:             diags.add(diagnostic.getMessage(Locale.getDefault()));
aoqi@0:             diagFound = true;
aoqi@0:         }
aoqi@0: 
aoqi@0:         String printDiags() {
aoqi@0:             StringBuilder buf = new StringBuilder();
aoqi@0:             for (String s : diags) {
aoqi@0:                 buf.append(s);
aoqi@0:                 buf.append("\n");
aoqi@0:             }
aoqi@0:             return buf.toString();
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0: }