/*

 * Copyright (c) 2011, 2015, 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 7093325 8006694

 * @summary Redundant entry in bytecode exception table

 *  temporarily workaround combo tests are causing time out in several platforms

 * @library lib

 * @build JavacTestingAbstractThreadedTest

 * @run main/othervm T7093325

 */

// use /othervm to avoid jtreg timeout issues (CODETOOLS-7900047)

// see JDK-8006746

import java.io.File;

import java.net.URI;

import java.util.Arrays;

import javax.tools.JavaCompiler;

import javax.tools.JavaFileObject;

import javax.tools.SimpleJavaFileObject;

import javax.tools.ToolProvider;

import com.sun.source.util.JavacTask;

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;

public class T7093325

    extends JavacTestingAbstractThreadedTest

    implements Runnable {

    enum StatementKind {

        THROW("throw new RuntimeException();", false, false),

        RETURN_NONEMPTY("System.out.println(); return;", true, false),

        RETURN_EMPTY("return;", true, true),

        APPLY("System.out.println();", true, false);

        String stmt;

        boolean canInline;

        boolean empty;

        private StatementKind(String stmt, boolean canInline, boolean empty) {

            this.stmt = stmt;

            this.canInline = canInline;

            this.empty = empty;

        }

    }

    enum CatchArity {

        NONE(""),

        ONE("catch (A a) { #S1 }"),

        TWO("catch (B b) { #S2 }"),

        THREE("catch (C c) { #S3 }"),

        FOUR("catch (D d) { #S4 }");

        String catchStr;

        private CatchArity(String catchStr) {

            this.catchStr = catchStr;

        }

        String catchers() {

            if (this.ordinal() == 0) {

                return catchStr;

            } else {

                return CatchArity.values()[this.ordinal() - 1].catchers() +

                        catchStr;

            }

        }

    }

    public static void main(String... args) throws Exception {

        for (CatchArity ca : CatchArity.values()) {

            for (StatementKind stmt0 : StatementKind.values()) {

                if (ca.ordinal() == 0) {

                    pool.execute(new T7093325(ca, stmt0));

                    continue;

                }

                for (StatementKind stmt1 : StatementKind.values()) {

                    if (ca.ordinal() == 1) {

                        pool.execute(new T7093325(ca, stmt0, stmt1));

                        continue;

                    }

                    for (StatementKind stmt2 : StatementKind.values()) {

                        if (ca.ordinal() == 2) {

                            pool.execute(new T7093325(ca, stmt0, stmt1, stmt2));

                            continue;

                        }

                        for (StatementKind stmt3 : StatementKind.values()) {

                            if (ca.ordinal() == 3) {

                                pool.execute(

                                    new T7093325(ca, stmt0, stmt1, stmt2, stmt3));

                                continue;

                            }

                            for (StatementKind stmt4 : StatementKind.values()) {

                                if (ca.ordinal() == 4) {

                                    pool.execute(

                                        new T7093325(ca, stmt0, stmt1,

                                                     stmt2, stmt3, stmt4));

                                    continue;

                                }

                                for (StatementKind stmt5 : StatementKind.values()) {

                                    pool.execute(

                                        new T7093325(ca, stmt0, stmt1, stmt2,

                                                     stmt3, stmt4, stmt5));

                                }

                            }

                        }

                    }

                }

            }

        }

        checkAfterExec();

    }

    /** instance decls **/

    CatchArity ca;

    StatementKind[] stmts;

    public T7093325(CatchArity ca, StatementKind... stmts) {

        this.ca = ca;

        this.stmts = stmts;

    }

    @Override

    public void run() {

        int id = checkCount.incrementAndGet();

        final JavaCompiler tool = ToolProvider.getSystemJavaCompiler();

        JavaSource source = new JavaSource(id);

        JavacTask ct = (JavacTask)tool.getTask(null, fm.get(), null,

                null, null, Arrays.asList(source));

        ct.call();

        verifyBytecode(source, id);

    }

    void verifyBytecode(JavaSource source, int id) {

        boolean lastInlined = false;

        boolean hasCode = false;

        int gapsCount = 0;

        for (int i = 0; i < stmts.length ; i++) {

            lastInlined = stmts[i].canInline;

            hasCode = hasCode || !stmts[i].empty;

            if (lastInlined && hasCode) {

                hasCode = false;

                gapsCount++;

            }

        }

        if (!lastInlined) {

            gapsCount++;

        }

        File compiledTest = new File(String.format("Test%s.class", id));

        try {

            ClassFile cf = ClassFile.read(compiledTest);

            if (cf == null) {

                throw new Error("Classfile not found: " +

                                compiledTest.getName());

            }

            Method test_method = null;

            for (Method m : cf.methods) {

                if (m.getName(cf.constant_pool).equals("test")) {

                    test_method = m;

                    break;

                }

            }

            if (test_method == null) {

                throw new Error("Method test() not found in class Test");

            }

            Code_attribute code = null;

            for (Attribute a : test_method.attributes) {

                if (a.getName(cf.constant_pool).equals(Attribute.Code)) {

                    code = (Code_attribute)a;

                    break;

                }

            }

            if (code == null) {

                throw new Error("Code attribute not found in method test()");

            }

            int actualGapsCount = 0;

            for (int i = 0; i < code.exception_table_length ; i++) {

                int catchType = code.exception_table[i].catch_type;

                if (catchType == 0) { //any

                    actualGapsCount++;

                }

            }

            if (actualGapsCount != gapsCount) {

                throw new Error("Bad exception table for test()\n" +

                            "expected gaps: " + gapsCount + "\n" +

                            "found gaps: " + actualGapsCount + "\n" +

                            source);

            }

        } catch (Exception e) {

            e.printStackTrace();

            throw new Error("error reading " + compiledTest +": " + e);

        }

    }

    class JavaSource extends SimpleJavaFileObject {

        static final String source_template =

                "class A extends RuntimeException {} \n" +

                "class B extends RuntimeException {} \n" +

                "class C extends RuntimeException {} \n" +

                "class D extends RuntimeException {} \n" +

                "class E extends RuntimeException {} \n" +

                "class Test#ID {\n" +

                "   void test() {\n" +

                "   try { #S0 } #C finally { System.out.println(); }\n" +

                "   }\n" +

                "}";

        String source;

        public JavaSource(int id) {

            super(URI.create(String.format("myfo:/Test%s.java", id)),

                  JavaFileObject.Kind.SOURCE);

            source = source_template.replace("#C", ca.catchers());

            source = source.replace("#S0", stmts[0].stmt);

            source = source.replace("#ID", String.valueOf(id));

            for (int i = 1; i < ca.ordinal() + 1; i++) {

                source = source.replace("#S" + i, stmts[i].stmt);

            }

        }

        @Override

        public String toString() {

            return source;

        }

        @Override

        public CharSequence getCharContent(boolean ignoreEncodingErrors) {

            return source;

        }

    }

}