/*

 * Copyright (c) 2012, 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 7194586

 *

 * @bug 8003280

 * @summary Add lambda tests

 *  Add back-end support for invokedynamic

 *

 */

import com.sun.source.tree.MethodInvocationTree;

import com.sun.source.tree.MethodTree;

import com.sun.source.util.TaskEvent;

import com.sun.source.util.TaskListener;

import com.sun.source.util.TreeScanner;

import com.sun.tools.classfile.Attribute;

import com.sun.tools.classfile.BootstrapMethods_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.Instruction;

import com.sun.tools.classfile.Method;

import com.sun.tools.javac.api.JavacTaskImpl;

import com.sun.tools.javac.api.JavacTool;

import com.sun.tools.javac.code.Symbol;

import com.sun.tools.javac.code.Symbol.MethodSymbol;

import com.sun.tools.javac.code.Symtab;

import com.sun.tools.javac.jvm.Pool;

import com.sun.tools.javac.tree.JCTree.JCMethodInvocation;

import com.sun.tools.javac.tree.JCTree.JCMethodDecl;

import com.sun.tools.javac.tree.JCTree.JCIdent;

import com.sun.tools.javac.util.Context;

import com.sun.tools.javac.util.Names;

import java.io.File;

import java.net.URI;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Locale;

import javax.tools.Diagnostic;

import javax.tools.JavaCompiler;

import javax.tools.JavaFileManager;

import javax.tools.JavaFileObject;

import javax.tools.SimpleJavaFileObject;

import javax.tools.StandardJavaFileManager;

import javax.tools.ToolProvider;

import static com.sun.tools.javac.jvm.ClassFile.*;

public class TestInvokeDynamic {

    static int checkCount = 0;

    enum StaticArgumentKind {

        STRING("Hello!", "String", "Ljava/lang/String;") {

            @Override

            boolean check(CPInfo cpInfo) throws Exception {

                return (cpInfo instanceof CONSTANT_String_info) &&

                        ((CONSTANT_String_info)cpInfo).getString().equals(value);

            }

        },

        CLASS(null, "Class<?>", "Ljava/lang/Class;") {

            @Override

            boolean check(CPInfo cpInfo) throws Exception {

                return (cpInfo instanceof CONSTANT_Class_info) &&

                        ((CONSTANT_Class_info)cpInfo).getName().equals("java/lang/String");

            }

        },

        INTEGER(1, "int", "I") {

            @Override

            boolean check(CPInfo cpInfo) throws Exception {

                return (cpInfo instanceof CONSTANT_Integer_info) &&

                        ((CONSTANT_Integer_info)cpInfo).value == ((Integer)value).intValue();

            }

        },

        LONG(1L, "long", "J") {

            @Override

            boolean check(CPInfo cpInfo) throws Exception {

                return (cpInfo instanceof CONSTANT_Long_info) &&

                        ((CONSTANT_Long_info)cpInfo).value == ((Long)value).longValue();

            }

        },

        FLOAT(1.0f, "float", "F") {

            @Override

            boolean check(CPInfo cpInfo) throws Exception {

                return (cpInfo instanceof CONSTANT_Float_info) &&

                        ((CONSTANT_Float_info)cpInfo).value == ((Float)value).floatValue();

            }

        },

        DOUBLE(1.0, "double","D") {

            @Override

            boolean check(CPInfo cpInfo) throws Exception {

                return (cpInfo instanceof CONSTANT_Double_info) &&

                        ((CONSTANT_Double_info)cpInfo).value == ((Double)value).doubleValue();

            }

        },

        METHOD_HANDLE(null, "MethodHandle", "Ljava/lang/invoke/MethodHandle;") {

            @Override

            boolean check(CPInfo cpInfo) throws Exception {

                if (!(cpInfo instanceof CONSTANT_MethodHandle_info)) return false;

                CONSTANT_MethodHandle_info handleInfo = (CONSTANT_MethodHandle_info)cpInfo;

                return handleInfo.getCPRefInfo().getClassName().equals("Array") &&

                        handleInfo.reference_kind == RefKind.REF_invokeVirtual &&

                        handleInfo.getCPRefInfo().getNameAndTypeInfo().getName().equals("clone") &&

                        handleInfo.getCPRefInfo().getNameAndTypeInfo().getType().equals("()Ljava/lang/Object;");

            }

        },

        METHOD_TYPE(null, "MethodType", "Ljava/lang/invoke/MethodType;") {

            @Override

            boolean check(CPInfo cpInfo) throws Exception {

                return (cpInfo instanceof CONSTANT_MethodType_info) &&

                        ((CONSTANT_MethodType_info)cpInfo).getType().equals("()Ljava/lang/Object;");

            }

        };

        Object value;

        String sourceTypeStr;

        String bytecodeTypeStr;

        StaticArgumentKind(Object value, String sourceTypeStr, String bytecodeTypeStr) {

            this.value = value;

            this.sourceTypeStr = sourceTypeStr;

            this.bytecodeTypeStr = bytecodeTypeStr;

        }

        abstract boolean check(CPInfo cpInfo) throws Exception;

            switch (this) {

                case STRING:

                case INTEGER:

                case LONG:

                case FLOAT:

                case DOUBLE:

                    return value;

                case CLASS:

                    return syms.stringType.tsym;

                case METHOD_HANDLE:

                case METHOD_TYPE:

                    return syms.arrayCloneMethod.type;

                default:

                    throw new AssertionError();

            }

        }

    }

    enum StaticArgumentsArity {

        ZERO(0),

        ONE(1),

        TWO(2),

        THREE(3);

        int arity;

        StaticArgumentsArity(int arity) {

            this.arity = arity;

        }

    }

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

        // Create a single file manager and compiler and reuse it for each compile to save time.

        StandardJavaFileManager fm = JavacTool.create().getStandardFileManager(null, null, null);

        final JavaCompiler tool = ToolProvider.getSystemJavaCompiler();

        for (StaticArgumentsArity arity : StaticArgumentsArity.values()) {

            if (arity.arity == 0) {

                new TestInvokeDynamic(arity).compileAndCheck(fm, tool);

            } else {

                for (StaticArgumentKind sak1 : StaticArgumentKind.values()) {

                    if (arity.arity == 1) {

                        new TestInvokeDynamic(arity, sak1).compileAndCheck(fm, tool);

                    } else {

                        for (StaticArgumentKind sak2 : StaticArgumentKind.values()) {

                            if (arity.arity == 2) {

                                new TestInvokeDynamic(arity, sak1, sak2).compileAndCheck(fm, tool);

                            } else {

                                for (StaticArgumentKind sak3 : StaticArgumentKind.values()) {

                                    new TestInvokeDynamic(arity, sak1, sak2, sak3).compileAndCheck(fm, tool);

                                }

                            }

                        }

                    }

                }

            }

        }

        System.out.println("Total checks made: " + checkCount);

    }

    StaticArgumentsArity arity;

    StaticArgumentKind[] saks;

    JavaSource source;

    DiagChecker dc;

    TestInvokeDynamic(StaticArgumentsArity arity, StaticArgumentKind... saks) {

        this.arity = arity;

        this.saks = saks;

        source = new JavaSource();

        dc = new DiagChecker();

    }

    void compileAndCheck(JavaFileManager fm, JavaCompiler tool) throws Exception {

        JavacTaskImpl ct = (JavacTaskImpl)tool.getTask(null, fm, dc,

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

        Context context = ct.getContext();

        Symtab syms = Symtab.instance(context);

        Names names = Names.instance(context);

        try {

            ct.generate();

        } catch (Throwable t) {

            t.printStackTrace();

            throw new AssertionError(String.format("Error thrown when compiling following code\n%s", source.source));

        }

        if (dc.diagFound) {

            throw new AssertionError(String.format("Diags found when compiling following code\n%s\n\n%s", source.source, dc.printDiags()));

        }

        verifyBytecode();

    }

    void verifyBytecode() {

        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");

            }

            int bsmIdx = -1;

            for (Instruction i : ea.getInstructions()) {

                if (i.getMnemonic().equals("invokedynamic")) {

                    CONSTANT_InvokeDynamic_info indyInfo =

                            (CONSTANT_InvokeDynamic_info)cf.constant_pool.get(i.getShort(1));

                    bsmIdx = indyInfo.bootstrap_method_attr_index;

                    if (!indyInfo.getNameAndTypeInfo().getType().equals("()V")) {

                        throw new AssertionError("type mismatch for CONSTANT_InvokeDynamic_info");

                    }

                }

            }

            if (bsmIdx == -1) {

                throw new Error("Missing invokedynamic in generated code");

            }

            BootstrapMethods_attribute bsm_attr = (BootstrapMethods_attribute)cf.getAttribute(Attribute.BootstrapMethods);

            if (bsm_attr.bootstrap_method_specifiers.length != 1) {

                throw new Error("Bad number of method specifiers in BootstrapMethods attribute");

            }

            BootstrapMethods_attribute.BootstrapMethodSpecifier bsm_spec =

                    bsm_attr.bootstrap_method_specifiers[0];

            if (bsm_spec.bootstrap_arguments.length != arity.arity) {

                throw new Error("Bad number of static invokedynamic args in BootstrapMethod attribute");

            }

            int count = 0;

            for (StaticArgumentKind sak : saks) {

                if (!sak.check(cf.constant_pool.get(bsm_spec.bootstrap_arguments[count]))) {

                    throw new Error("Bad static argument value " + sak);

                }

                count++;

            }

            CONSTANT_MethodHandle_info bsm_handle =

                    (CONSTANT_MethodHandle_info)cf.constant_pool.get(bsm_spec.bootstrap_method_ref);

            if (bsm_handle.reference_kind != RefKind.REF_invokeStatic) {

                throw new Error("Bad kind on boostrap method handle");

            }

            CONSTANT_Methodref_info bsm_ref =

                    (CONSTANT_Methodref_info)cf.constant_pool.get(bsm_handle.reference_index);

            if (!bsm_ref.getClassInfo().getName().equals("Bootstrap")) {

                throw new Error("Bad owner of boostrap method");

            }

            if (!bsm_ref.getNameAndTypeInfo().getName().equals("bsm")) {

                throw new Error("Bad boostrap method name");

            }

            if (!bsm_ref.getNameAndTypeInfo().getType().equals(asBSMSignatureString())) {

                throw new Error("Bad boostrap method type" + bsm_ref.getNameAndTypeInfo().getType() + " " + asBSMSignatureString());

            }

        } catch (Exception e) {

            e.printStackTrace();

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

        }

    }

    String asBSMSignatureString() {

        StringBuilder buf = new StringBuilder();

        buf.append("(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;");

        for (StaticArgumentKind sak : saks) {

            buf.append(sak.bytecodeTypeStr);

        }

        buf.append(")Ljava/lang/invoke/CallSite;");

        return buf.toString();

    }

    class JavaSource extends SimpleJavaFileObject {

        static final String source_template = "import java.lang.invoke.*;\n" +

                "class Bootstrap {\n" +

                "   public static CallSite bsm(MethodHandles.Lookup lookup, String name, MethodType methodType #SARGS) {\n" +

                "       return null;\n" +

                "   }\n" +

                "}\n" +

                "class Test {\n" +

                "   void m() { }\n" +

                "   void test() { m(); }\n" +

                "}";

        String source;

        JavaSource() {

            super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);

            source = source_template.replace("#SARGS", asSignatureString());

        }

        @Override

        public CharSequence getCharContent(boolean ignoreEncodingErrors) {

            return source;

        }

        String asSignatureString() {

            int count = 0;

            StringBuilder buf = new StringBuilder();

            for (StaticArgumentKind sak : saks) {

                buf.append(",");

                buf.append(sak.sourceTypeStr);

                buf.append(' ');

                buf.append(String.format("x%d", count++));

            }

            return buf.toString();

        }

    }

    class Indifier extends TreeScanner<Void, Void> implements TaskListener {

        MethodSymbol bsm;

        Symtab syms;

        Names names;

            this.syms = syms;

            this.names = names;

        }

        @Override

        public void started(TaskEvent e) {

            //do nothing

        }

        @Override

        public void finished(TaskEvent e) {

            if (e.getKind() == TaskEvent.Kind.ANALYZE) {

                scan(e.getCompilationUnit(), null);

            }

        }

        @Override

        public Void visitMethodInvocation(MethodInvocationTree node, Void p) {

            super.visitMethodInvocation(node, p);

            JCMethodInvocation apply = (JCMethodInvocation)node;

            JCIdent ident = (JCIdent)apply.meth;

            Symbol oldSym = ident.sym;

            if (!oldSym.isConstructor()) {

                Object[] staticArgs = new Object[arity.arity];

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

                }

                ident.sym = new Symbol.DynamicMethodSymbol(oldSym.name, oldSym.owner, REF_invokeStatic, bsm, oldSym.type, staticArgs);

            }

            return null;

        }

        @Override

        public Void visitMethod(MethodTree node, Void p) {

            super.visitMethod(node, p);

            if (node.getName().toString().equals("bsm")) {

                bsm = ((JCMethodDecl)node).sym;

            }

            return null;

        }

    }

    static class DiagChecker implements javax.tools.DiagnosticListener<JavaFileObject> {

        boolean diagFound;

        ArrayList<String> diags = new ArrayList<>();

        public void report(Diagnostic<? extends JavaFileObject> diagnostic) {

            diags.add(diagnostic.getMessage(Locale.getDefault()));

            diagFound = true;

        }

        String printDiags() {

            StringBuilder buf = new StringBuilder();

            for (String s : diags) {

                buf.append(s);

                buf.append("\n");

            }

            return buf.toString();

        }

    }

}