Example usage for org.objectweb.asm Label Label

List of usage examples for org.objectweb.asm Label Label

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Introduction

In this page you can find the example usage for org.objectweb.asm Label Label.

Prototype

public Label()

Source Link

Document

Constructs a new label.

Usage

From source file:com.asakusafw.dag.compiler.builtin.MasterCheckOperatorGenerator.java

License:Apache License

@Override
protected void defineProcess(MethodVisitor method, Context context, UserOperator operator, LocalVarRef master,
        LocalVarRef transaction, FieldRef impl, Map<OperatorProperty, FieldRef> dependencies,
        ClassDescription target) {/*from   ww  w  . java  2  s .c  om*/
    OperatorOutput found = operator.getOutputs().get(MasterCheck.ID_OUTPUT_FOUND);
    OperatorOutput missed = operator.getOutputs().get(MasterCheck.ID_OUTPUT_MISSED);

    Label onNull = new Label();
    Label end = new Label();
    master.load(method);
    getConst(method, null);
    method.visitJumpInsn(Opcodes.IF_ACMPEQ, onNull);

    dependencies.get(found).load(method);
    transaction.load(method);
    invokeResultAdd(method);
    method.visitJumpInsn(Opcodes.GOTO, end);

    method.visitLabel(onNull);
    dependencies.get(missed).load(method);
    transaction.load(method);
    invokeResultAdd(method);

    method.visitLabel(end);
}

From source file:com.asakusafw.dag.compiler.builtin.MasterJoinOperatorGenerator.java

License:Apache License

@Override
protected void defineProcess(MethodVisitor method, Context context, UserOperator operator, LocalVarRef master,
        LocalVarRef transaction, FieldRef impl, Map<OperatorProperty, FieldRef> dependencies,
        ClassDescription target) {//  w  ww.j  av a  2 s  .c om
    OperatorOutput joined = operator.getOutput(MasterJoin.ID_OUTPUT_JOINED);
    OperatorOutput missed = operator.getOutput(MasterJoin.ID_OUTPUT_MISSED);

    Label onNull = new Label();
    Label end = new Label();
    master.load(method);
    getConst(method, null);
    method.visitJumpInsn(Opcodes.IF_ACMPEQ, onNull);

    dependencies.get(joined).load(method);
    performJoin(method, context, operator, master, transaction, impl, dependencies, target);
    invokeResultAdd(method);
    method.visitJumpInsn(Opcodes.GOTO, end);

    method.visitLabel(onNull);
    dependencies.get(missed).load(method);
    transaction.load(method);
    invokeResultAdd(method);

    method.visitLabel(end);
}

From source file:com.asakusafw.dag.compiler.builtin.MasterJoinUpdateOperatorGenerator.java

License:Apache License

@Override
protected void defineProcess(MethodVisitor method, Context context, UserOperator operator, LocalVarRef master,
        LocalVarRef transaction, FieldRef impl, Map<OperatorProperty, FieldRef> dependencies,
        ClassDescription target) {/*  www  .j  a va 2 s.  co m*/
    OperatorOutput found = operator.getOutputs().get(MasterCheck.ID_OUTPUT_FOUND);
    OperatorOutput missed = operator.getOutputs().get(MasterCheck.ID_OUTPUT_MISSED);

    Label onNull = new Label();
    Label end = new Label();
    master.load(method);
    getConst(method, null);
    method.visitJumpInsn(Opcodes.IF_ACMPEQ, onNull);

    List<ValueRef> arguments = new ArrayList<>();
    arguments.add(impl);
    arguments.add(master);
    arguments.add(transaction);
    appendExtraViews(arguments::add, operator, dependencies::get);
    appendArguments(arguments::add, operator, dependencies::get);
    invoke(method, context, operator, arguments);
    dependencies.get(found).load(method);
    transaction.load(method);
    invokeResultAdd(method);
    method.visitJumpInsn(Opcodes.GOTO, end);

    method.visitLabel(onNull);
    dependencies.get(missed).load(method);
    transaction.load(method);
    invokeResultAdd(method);

    method.visitLabel(end);
}

From source file:com.asakusafw.dag.compiler.builtin.SummarizeOperatorGenerator.java

License:Apache License

private static void defineCheckNull(ClassWriter writer, UserOperator operator, DataModelReference inputType) {

    MethodVisitor method = writer.visitMethod(Opcodes.ACC_PRIVATE | Opcodes.ACC_STATIC, METHOD_CHECK_NON_NULL,
            Type.getMethodDescriptor(Type.VOID_TYPE, typeOf(ValueOption.class), typeOf(Object.class),
                    typeOf(String.class)),
            null, null);//from  w w  w . j a  va2 s.c o  m

    LocalVarRef optionVar = new LocalVarRef(Opcodes.ALOAD, 0);
    LocalVarRef objectVar = new LocalVarRef(Opcodes.ALOAD, 1);
    LocalVarRef nameVar = new LocalVarRef(Opcodes.ALOAD, 2);

    // if (option.isNull()) {
    Label ifEnd = new Label();
    optionVar.load(method);
    getNullity(method, VALUE_DESC);
    method.visitJumpInsn(Opcodes.IFEQ, ifEnd);

    // new NullPointerException ...
    method.visitTypeInsn(Opcodes.NEW, typeOf(NullPointerException.class).getInternalName());
    method.visitInsn(Opcodes.DUP);

    // str = String.format("<type>.%s must not be null (in <operator>): %s", name, object)
    getConst(method,
            String.format("%s.%%s must not be null (in %s.%s): %%s", inputType.getDeclaration().getSimpleName(),
                    operator.getMethod().getDeclaringClass().getSimpleName(), operator.getMethod().getName()));

    getArray(method, typeOf(Object.class), new LocalVarRef[] { nameVar, objectVar });
    method.visitMethodInsn(Opcodes.INVOKESTATIC, typeOf(String.class).getInternalName(), "format",
            Type.getMethodDescriptor(typeOf(String.class), typeOf(String.class), typeOf(Object[].class)),
            false);

    // throw new NullPointerException(str)
    method.visitMethodInsn(Opcodes.INVOKESPECIAL, typeOf(NullPointerException.class).getInternalName(),
            CONSTRUCTOR_NAME, Type.getMethodDescriptor(Type.VOID_TYPE, typeOf(String.class)), false);

    method.visitInsn(Opcodes.ATHROW);

    method.visitLabel(ifEnd);
    // }
    method.visitInsn(Opcodes.RETURN);
    method.visitMaxs(0, 0);
    method.visitEnd();
}

From source file:com.asakusafw.dag.compiler.codegen.DataComparatorGenerator.java

License:Apache License

private static void defineCompare(ClassWriter writer, DataModelReference reference,
        List<Group.Ordering> orderings) {
    MethodVisitor v = writer.visitMethod(Opcodes.ACC_PUBLIC, "compare", DESC_COMPARE, null,
            new String[] { typeOf(IOException.class).getInternalName(), });
    LocalVarRef a = new LocalVarRef(Opcodes.ALOAD, 1);
    LocalVarRef b = new LocalVarRef(Opcodes.ALOAD, 2);
    for (Group.Ordering ordering : orderings) {
        PropertyReference property = Invariants
                .requireNonNull(reference.findProperty(ordering.getPropertyName()));

        // int diff = ValueOptionSerDe.compareT({a, b}, {b, a});
        switch (ordering.getDirection()) {
        case ASCENDANT:
            a.load(v);/*w w  w. j ava2  s  . c o  m*/
            b.load(v);
            break;
        case DESCENDANT:
            b.load(v);
            a.load(v);
            break;
        default:
            throw new AssertionError(ordering);
        }
        v.visitMethodInsn(Opcodes.INVOKESTATIC, typeOf(ValueOptionSerDe.class).getInternalName(),
                Invariants.requireNonNull(METHOD_NAMES.get(property.getType())), DESC_COMPARE, false);
        LocalVarRef cmp = putLocalVar(v, Type.INT, 3);
        Label eq = new Label();

        // if (diff != 0) {
        cmp.load(v);
        v.visitJumpInsn(Opcodes.IFEQ, eq);

        // return diff;
        cmp.load(v);
        v.visitInsn(Opcodes.IRETURN);

        // } @ eq
        v.visitLabel(eq);
    }
    getConst(v, 0);
    v.visitInsn(Opcodes.IRETURN);
    v.visitMaxs(0, 0);
    v.visitEnd();
}

From source file:com.asakusafw.dag.compiler.codegen.ObjectComparatorGenerator.java

License:Apache License

private static void defineCompare(ClassWriter writer, DataModelReference reference,
        List<Group.Ordering> orderings) {
    MethodVisitor v = writer.visitMethod(Opcodes.ACC_PUBLIC, "compare",
            Type.getMethodDescriptor(typeOf(int.class), typeOf(Object.class), typeOf(Object.class)), null,
            null);/*from w  ww . j av a  2  s . co  m*/
    LocalVarRef a = cast(v, 1, reference.getDeclaration());
    LocalVarRef b = cast(v, 2, reference.getDeclaration());
    for (Group.Ordering ordering : orderings) {
        LocalVarRef left;
        LocalVarRef right;
        switch (ordering.getDirection()) {
        case ASCENDANT:
            left = a;
            right = b;
            break;
        case DESCENDANT:
            left = b;
            right = a;
            break;
        default:
            throw new AssertionError(ordering);
        }

        // int diff = left.getXOption().compareTo(right.getXOption());
        PropertyReference property = Invariants
                .requireNonNull(reference.findProperty(ordering.getPropertyName()));
        left.load(v);
        getOption(v, property);
        right.load(v);
        getOption(v, property);
        v.visitMethodInsn(Opcodes.INVOKEINTERFACE, TYPE_COMPARABLE.getInternalName(), "compareTo",
                Type.getMethodDescriptor(typeOf(int.class), typeOf(Object.class)), true);
        LocalVarRef cmp = putLocalVar(v, Type.INT, 3);
        Label eq = new Label();

        // if (diff != 0) {
        cmp.load(v);
        v.visitJumpInsn(Opcodes.IFEQ, eq);

        // return diff;
        cmp.load(v);
        v.visitInsn(Opcodes.IRETURN);

        // } @ eq
        v.visitLabel(eq);
    }
    getConst(v, 0);
    v.visitInsn(Opcodes.IRETURN);
    v.visitMaxs(0, 0);
    v.visitEnd();
}

From source file:com.asakusafw.dag.compiler.directio.OutputPatternSerDeGenerator.java

License:Apache License

private static void putGetProperty(ClassWriter writer, DataModelReference reference, OutputPattern pattern) {
    List<PropertyReference> properties = pattern.getResourcePattern().stream()
            .filter(s -> s.getKind() == OutputPattern.SourceKind.PROPERTY).map(CompiledSegment::getTarget)
            .collect(Collectors.toList());
    if (properties.isEmpty()) {
        return;/*from  w  w w . j  a v  a  2  s  . c  o  m*/
    }
    MethodVisitor v = writer.visitMethod(Opcodes.ACC_PUBLIC, "getProperty",
            Type.getMethodDescriptor(typeOf(Object.class), typeOf(Object.class), typeOf(int.class)), null,
            null);
    LocalVarRef object = cast(v, 1, reference.getDeclaration());
    LocalVarRef index = new LocalVarRef(Opcodes.ILOAD, 2);
    Label[] caseLabels = properties.stream().map(o -> new Label()).toArray(Label[]::new);
    Label defaultLabel = new Label();

    index.load(v);
    v.visitTableSwitchInsn(0, caseLabels.length - 1, defaultLabel, caseLabels);

    for (int i = 0, n = properties.size(); i < n; i++) {
        v.visitLabel(caseLabels[i]);
        PropertyReference property = properties.get(i);
        object.load(v);
        getOption(v, property);
        v.visitInsn(Opcodes.ARETURN);
    }
    v.visitLabel(defaultLabel);
    getNew(v, Descriptions.typeOf(AssertionError.class));
    v.visitInsn(Opcodes.ATHROW);

    v.visitMaxs(0, 0);
    v.visitEnd();
}

From source file:com.asakusafw.dag.compiler.jdbc.PreparedStatementAdapterGenerator.java

License:Apache License

private static void defineBody(ClassWriter writer, DataModelReference dataType,
        List<PropertyReference> properties, Optional<FieldRef> dateBuf) {
    MethodVisitor v = writer.visitMethod(Opcodes.ACC_PUBLIC, "drive", //$NON-NLS-1$
            Type.getMethodDescriptor(typeOf(void.class), typeOf(PreparedStatement.class), typeOf(Object.class)),
            null, new String[] { typeOf(SQLException.class).getInternalName(), });
    LocalVarRef row = new LocalVarRef(Opcodes.ALOAD, 1);
    LocalVarRef object = cast(v, 2, dataType.getDeclaration());

    int columnIndex = 0;
    for (PropertyReference property : properties) {
        columnIndex++;//from ww  w .  ja  v a  2  s .com

        object.load(v);
        getOption(v, property);
        LocalVarRef option = putLocalVar(v, Type.OBJECT, 3);

        Label elseIf = new Label();
        Label endIf = new Label();

        // if (option.isNull()) {
        option.load(v);
        v.visitMethodInsn(Opcodes.INVOKEVIRTUAL, typeOf(ValueOption.class).getInternalName(), "isNull", //$NON-NLS-1$
                Type.getMethodDescriptor(typeOf(boolean.class)), false);
        v.visitJumpInsn(Opcodes.IFEQ, elseIf);

        row.load(v);
        getConst(v, columnIndex);
        doSetNull(v, property);

        v.visitJumpInsn(Opcodes.GOTO, endIf);

        // } else { @elseIf
        v.visitLabel(elseIf);

        row.load(v);
        getConst(v, columnIndex);
        option.load(v);
        doSetValue(v, property, dateBuf);

        // } @endIf
        v.visitLabel(endIf);
    }

    v.visitInsn(Opcodes.RETURN);
    v.visitMaxs(0, 0);
    v.visitEnd();
}

From source file:com.asakusafw.dag.compiler.jdbc.ResultSetAdapterGenerator.java

License:Apache License

private static void defineBody(ClassWriter writer, DataModelReference dataType,
        List<PropertyReference> properties, FieldRef valueBuffer, Optional<FieldRef> calendarBuf) {
    MethodVisitor v = writer.visitMethod(Opcodes.ACC_PUBLIC, "extract",
            Type.getMethodDescriptor(typeOf(Object.class), typeOf(ResultSet.class)), null,
            new String[] { typeOf(SQLException.class).getInternalName(), });
    LocalVarRef rs = new LocalVarRef(Opcodes.ALOAD, 1);
    valueBuffer.load(v);/*w ww.  j  a va  2 s .c o m*/
    LocalVarRef buf = putLocalVar(v, Type.OBJECT, 2);

    int columnIndex = 0;
    Set<PropertyName> sawSet = new HashSet<>();
    for (PropertyReference property : properties) {
        columnIndex++;
        Label elseIf = new Label();
        Label endIf = new Label();

        buf.load(v);
        getOption(v, property);

        rs.load(v);
        getConst(v, columnIndex);
        doGetValue(v, property, calendarBuf);

        // if (rs.wasNull()) {
        rs.load(v);
        v.visitMethodInsn(Opcodes.INVOKEINTERFACE, typeOf(ResultSet.class).getInternalName(), "wasNull",
                Type.getMethodDescriptor(typeOf(boolean.class)), true);
        v.visitJumpInsn(Opcodes.IFEQ, elseIf);
        if (isWideType(property)) {
            v.visitInsn(Opcodes.POP2);
        } else {
            v.visitInsn(Opcodes.POP);
        }
        doSetNull(v);
        v.visitJumpInsn(Opcodes.GOTO, endIf);

        // } else { @elseIf
        v.visitLabel(elseIf);
        doSetValue(v, property);

        // } @endIf
        v.visitLabel(endIf);

        sawSet.add(property.getName());
    }

    // resets other properties
    for (PropertyReference property : dataType.getProperties()) {
        if (sawSet.contains(property.getName())) {
            continue;
        }
        buf.load(v);
        getOption(v, property);
        doSetNull(v);
    }

    buf.load(v);
    v.visitInsn(Opcodes.ARETURN);
    v.visitMaxs(0, 0);
    v.visitEnd();
}

From source file:com.centimia.orm.jaqu.ext.asm.JaquClassAdapter.java

License:Open Source License

/**
 * Generates the new method body, copy the old to a new method and connect them.
 * /* w w w . j a  v a  2 s.com*/
 * the structure of the new method is:<br>
 * <br><b><div style="background:lightgray">
 * <pre>
 * public [CollectionType] [getterName]() {
 *    if ([fieldName] == null){
 *       try {
 *          if (null == db || db.isClosed())
 *             throw new RuntimeException("Cannot initialize a 'Relation' outside an open session!!!. Try initializing the field directly within the class.");
 *          Method method = db.getClass().getDeclaredMethod("getRelationFromDb", String.class, Object.class, Class.class);
 *          method.setAccessible(true);
 *          children = (Collection<TestTable>)method.invoke(db, [fieldName], this, TestTable.class);
 *          method.setAccessible(false);
 *       }
 *       catch (Exception e) {
 *          if (e instanceof RuntimeException)
 *             throw (RuntimeException)e;
 *          throw new RuntimeException(e.getMessage(), e);
 *       }
 *    }
 * return $orig_[getterName]();
 * }
 * </pre>
 * </div>
 * 
 * @param access
 * @param desc
 * @param signature
 * @param exceptions
 * @param name
 * @param newName
 * @param fieldName
 */
private void generateNewMethodBody(int access, String desc, String signature, String[] exceptions, String name,
        String newName, String fieldName) {
    MethodVisitor mv = cv.visitMethod(access, name, desc, signature, exceptions);
    String fieldSignature = signature.substring(signature.indexOf(')') + 1, signature.lastIndexOf('<')) + ";";
    String type = signature.substring(signature.indexOf('<') + 1, signature.indexOf('>'));
    String cast = desc.substring(desc.indexOf("java/"), desc.indexOf(';'));

    mv.visitCode();
    Label l0 = new Label();
    Label l1 = new Label();
    Label l2 = new Label();
    mv.visitTryCatchBlock(l0, l1, l2, "java/lang/Exception");
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, className, fieldName, fieldSignature);
    Label l3 = new Label();
    mv.visitJumpInsn(IFNONNULL, l3);
    mv.visitLabel(l0);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, className, "db", "Lcom/centimia/orm/jaqu/Db;");
    Label l4 = new Label();
    mv.visitJumpInsn(IFNULL, l4);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, className, "db", "Lcom/centimia/orm/jaqu/Db;");
    mv.visitMethodInsn(INVOKEVIRTUAL, "com/centimia/orm/jaqu/Db", "isClosed", "()Z", false);
    Label l5 = new Label();
    mv.visitJumpInsn(IFEQ, l5);
    mv.visitLabel(l4);
    mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
    mv.visitTypeInsn(NEW, "java/lang/RuntimeException");
    mv.visitInsn(DUP);
    mv.visitLdcInsn(
            "Cannot initialize a 'Relation' outside an open session!!!. Try initializing the field directly within the class.");
    mv.visitMethodInsn(INVOKESPECIAL, "java/lang/RuntimeException", "<init>", "(Ljava/lang/String;)V", false);
    mv.visitInsn(ATHROW);
    mv.visitLabel(l5);
    mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, className, "db", "Lcom/centimia/orm/jaqu/Db;");
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "getClass", "()Ljava/lang/Class;", false);
    mv.visitLdcInsn("getRelationFromDb");
    mv.visitInsn(ICONST_3);
    mv.visitTypeInsn(ANEWARRAY, "java/lang/Class");
    mv.visitInsn(DUP);
    mv.visitInsn(ICONST_0);
    mv.visitLdcInsn(Type.getType("Ljava/lang/String;"));
    mv.visitInsn(AASTORE);
    mv.visitInsn(DUP);
    mv.visitInsn(ICONST_1);
    mv.visitLdcInsn(Type.getType("Ljava/lang/Object;"));
    mv.visitInsn(AASTORE);
    mv.visitInsn(DUP);
    mv.visitInsn(ICONST_2);
    mv.visitLdcInsn(Type.getType("Ljava/lang/Class;"));
    mv.visitInsn(AASTORE);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Class", "getDeclaredMethod",
            "(Ljava/lang/String;[Ljava/lang/Class;)Ljava/lang/reflect/Method;", false);
    mv.visitVarInsn(ASTORE, 1);
    mv.visitVarInsn(ALOAD, 1);
    mv.visitInsn(ICONST_1);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Method", "setAccessible", "(Z)V", false);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitVarInsn(ALOAD, 1);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, className, "db", "Lcom/centimia/orm/jaqu/Db;");
    mv.visitInsn(ICONST_3);
    mv.visitTypeInsn(ANEWARRAY, "java/lang/Object");
    mv.visitInsn(DUP);
    mv.visitInsn(ICONST_0);
    mv.visitLdcInsn(fieldName);
    mv.visitInsn(AASTORE);
    mv.visitInsn(DUP);
    mv.visitInsn(ICONST_1);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitInsn(AASTORE);
    mv.visitInsn(DUP);
    mv.visitInsn(ICONST_2);
    mv.visitLdcInsn(Type.getType(type));
    mv.visitInsn(AASTORE);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Method", "invoke",
            "(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;", false);
    mv.visitTypeInsn(CHECKCAST, cast);
    mv.visitFieldInsn(PUTFIELD, className, fieldName, fieldSignature);
    mv.visitVarInsn(ALOAD, 1);
    mv.visitInsn(ICONST_0);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Method", "setAccessible", "(Z)V", false);
    mv.visitLabel(l1);
    mv.visitJumpInsn(GOTO, l3);
    mv.visitLabel(l2);
    mv.visitFrame(Opcodes.F_SAME1, 0, null, 1, new Object[] { "java/lang/Exception" });
    mv.visitVarInsn(ASTORE, 1);
    mv.visitVarInsn(ALOAD, 1);
    mv.visitTypeInsn(INSTANCEOF, "java/lang/RuntimeException");
    Label l6 = new Label();
    mv.visitJumpInsn(IFEQ, l6);
    mv.visitVarInsn(ALOAD, 1);
    mv.visitTypeInsn(CHECKCAST, "java/lang/RuntimeException");
    mv.visitInsn(ATHROW);
    mv.visitLabel(l6);
    mv.visitFrame(Opcodes.F_APPEND, 1, new Object[] { "java/lang/Exception" }, 0, null);
    mv.visitTypeInsn(NEW, "java/lang/RuntimeException");
    mv.visitInsn(DUP);
    mv.visitVarInsn(ALOAD, 1);
    mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Exception", "getMessage", "()Ljava/lang/String;", false);
    mv.visitVarInsn(ALOAD, 1);
    mv.visitMethodInsn(INVOKESPECIAL, "java/lang/RuntimeException", "<init>",
            "(Ljava/lang/String;Ljava/lang/Throwable;)V", false);
    mv.visitInsn(ATHROW);
    mv.visitLabel(l3);
    mv.visitFrame(Opcodes.F_CHOP, 1, null, 0, null);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitMethodInsn(INVOKESPECIAL, className, newName, desc, false);
    mv.visitInsn(ARETURN);
    mv.visitMaxs(7, 2);
    mv.visitEnd();
}