Example usage for org.objectweb.asm MethodVisitor visitLabel

List of usage examples for org.objectweb.asm MethodVisitor visitLabel

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Introduction

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

Prototype

public void visitLabel(final Label label)

Source Link

Document

Visits a label.

Usage

From source file:erjang.ETuple.java

License:Apache License

private static void create_cast2(ClassAdapter cw, int n) {
    MethodVisitor mv = cw.visitMethod(Opcodes.ACC_PUBLIC | Opcodes.ACC_STATIC, "cast",
            "(L" + Type.getInternalName(EObject.class) + ";)L" + ETUPLE_NAME + n + ";", null, null);
    mv.visitCode();//from ww  w .j  a v  a2s  .  co m

    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitInsn(Opcodes.DUP);
    mv.visitTypeInsn(Opcodes.INSTANCEOF, ETUPLE_NAME + n);

    Label fail = new Label();

    mv.visitJumpInsn(Opcodes.IFEQ, fail);
    mv.visitVarInsn(Opcodes.ALOAD, 0);
    mv.visitTypeInsn(Opcodes.CHECKCAST, ETUPLE_NAME + n);
    mv.visitInsn(Opcodes.ARETURN);

    mv.visitLabel(fail);
    mv.visitInsn(Opcodes.ACONST_NULL);
    mv.visitInsn(Opcodes.ARETURN);

    mv.visitMaxs(2, 2);
    mv.visitEnd();
}

From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeStructGenerator.java

License:Apache License

private void makeSetMethod(ClassWriter classWriter, Struct struct) {
    String owner = struct.getPackageAndClass().toJVMType();
    MethodVisitor visitor = classWriter.visitMethod(ACC_PUBLIC, "set",
            "(Ljava/lang/String;Ljava/lang/Object;)Lgololang/GoloStruct;", null, null);
    visitor.visitCode();//from  ww w.  j  a  v a2  s  .c  om
    insertPrivateElementCheck(struct, visitor);
    Label nextCase = new Label();
    for (String member : struct.getMembers()) {
        visitor.visitLdcInsn(member);
        visitor.visitVarInsn(ALOAD, 1);
        visitor.visitJumpInsn(IF_ACMPNE, nextCase);
        visitor.visitVarInsn(ALOAD, 0);
        visitor.visitVarInsn(ALOAD, 2);
        visitor.visitMethodInsn(INVOKEVIRTUAL, owner, member, "(Ljava/lang/Object;)Lgololang/GoloStruct;");
        visitor.visitInsn(ARETURN);
        visitor.visitLabel(nextCase);
        nextCase = new Label();
    }
    insertUnknowElementCode(struct, visitor);
    visitor.visitMaxs(0, 0);
    visitor.visitEnd();
}

From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeStructGenerator.java

License:Apache License

private void makeGetMethod(ClassWriter classWriter, Struct struct) {
    String owner = struct.getPackageAndClass().toJVMType();
    MethodVisitor visitor = classWriter.visitMethod(ACC_PUBLIC, "get", "(Ljava/lang/String;)Ljava/lang/Object;",
            null, null);/*from w w w .java2s  .c  o  m*/
    visitor.visitCode();
    insertPrivateElementCheck(struct, visitor);
    Label nextCase = new Label();
    for (String member : struct.getMembers()) {
        visitor.visitLdcInsn(member);
        visitor.visitVarInsn(ALOAD, 1);
        visitor.visitJumpInsn(IF_ACMPNE, nextCase);
        visitor.visitVarInsn(ALOAD, 0);
        visitor.visitMethodInsn(INVOKEVIRTUAL, owner, member, "()Ljava/lang/Object;");
        visitor.visitInsn(ARETURN);
        visitor.visitLabel(nextCase);
        nextCase = new Label();
    }
    insertUnknowElementCode(struct, visitor);
    visitor.visitMaxs(0, 0);
    visitor.visitEnd();
}

From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeStructGenerator.java

License:Apache License

private void insertPrivateElementCheck(Struct struct, MethodVisitor visitor) {
    Label afterPrivateCheck = new Label();
    visitor.visitVarInsn(ALOAD, 1);/*from   w  w w . ja  v a  2s . c  o m*/
    visitor.visitLdcInsn("_");
    visitor.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "startsWith", "(Ljava/lang/String;)Z");
    visitor.visitJumpInsn(IFEQ, afterPrivateCheck);
    visitor.visitTypeInsn(NEW, "java/lang/IllegalArgumentException");
    visitor.visitInsn(DUP);
    visitor.visitLdcInsn("Private member of " + struct.getPackageAndClass().toString());
    visitor.visitMethodInsn(INVOKESPECIAL, "java/lang/IllegalArgumentException", "<init>",
            "(Ljava/lang/String;)V");
    visitor.visitInsn(ATHROW);
    visitor.visitLabel(afterPrivateCheck);
}

From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeStructGenerator.java

License:Apache License

private void makeEquals(ClassWriter classWriter, Struct struct) {
    String owner = struct.getPackageAndClass().toJVMType();
    MethodVisitor visitor = classWriter.visitMethod(ACC_PUBLIC, "equals", "(Ljava/lang/Object;)Z", null, null);
    Label notFrozenLabel = new Label();
    Label falseLabel = new Label();
    Label sameTypeLabel = new Label();
    visitor.visitCode();//  w w  w .j a  v  a2s  . c  om
    visitor.visitVarInsn(ALOAD, 0);
    visitor.visitFieldInsn(GETFIELD, owner, $_frozen, "Z");
    visitor.visitJumpInsn(IFNE, notFrozenLabel);
    // super.equals()
    visitor.visitVarInsn(ALOAD, 0);
    visitor.visitVarInsn(ALOAD, 1);
    visitor.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "equals", "(Ljava/lang/Object;)Z");
    visitor.visitInsn(IRETURN);
    // The receiver is frozen
    visitor.visitLabel(notFrozenLabel);
    visitor.visitVarInsn(ALOAD, 1);
    visitor.visitTypeInsn(INSTANCEOF, owner);
    visitor.visitJumpInsn(IFNE, sameTypeLabel);
    visitor.visitJumpInsn(GOTO, falseLabel);
    // The argument is of the same type, too
    visitor.visitLabel(sameTypeLabel);
    visitor.visitVarInsn(ALOAD, 1);
    visitor.visitTypeInsn(CHECKCAST, owner);
    visitor.visitFieldInsn(GETFIELD, owner, $_frozen, "Z");
    visitor.visitJumpInsn(IFEQ, falseLabel);
    // The argument is not frozen
    for (String member : struct.getMembers()) {
        visitor.visitVarInsn(ALOAD, 0);
        visitor.visitFieldInsn(GETFIELD, owner, member, "Ljava/lang/Object;");
        visitor.visitVarInsn(ALOAD, 1);
        visitor.visitTypeInsn(CHECKCAST, owner);
        visitor.visitFieldInsn(GETFIELD, owner, member, "Ljava/lang/Object;");
        visitor.visitMethodInsn(INVOKESTATIC, "java/util/Objects", "equals",
                "(Ljava/lang/Object;Ljava/lang/Object;)Z");
        visitor.visitJumpInsn(IFEQ, falseLabel);
    }
    visitor.visitInsn(ICONST_1);
    visitor.visitInsn(IRETURN);
    // False
    visitor.visitLabel(falseLabel);
    visitor.visitInsn(ICONST_0);
    visitor.visitInsn(IRETURN);
    visitor.visitMaxs(0, 0);
    visitor.visitEnd();
}

From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeStructGenerator.java

License:Apache License

private void makeHashCode(ClassWriter classWriter, Struct struct) {
    String owner = struct.getPackageAndClass().toJVMType();
    MethodVisitor visitor = classWriter.visitMethod(ACC_PUBLIC, "hashCode", "()I", null, null);
    Label notFrozenLabel = new Label();
    visitor.visitCode();/* w w w .ja va2 s  .c om*/
    visitor.visitVarInsn(ALOAD, 0);
    visitor.visitFieldInsn(GETFIELD, owner, $_frozen, "Z");
    visitor.visitJumpInsn(IFNE, notFrozenLabel);
    // super.hashCode()
    visitor.visitVarInsn(ALOAD, 0);
    visitor.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "hashCode", "()I");
    visitor.visitInsn(IRETURN);
    // The receiver is frozen
    visitor.visitLabel(notFrozenLabel);
    loadInteger(visitor, struct.getMembers().size());
    visitor.visitTypeInsn(ANEWARRAY, "java/lang/Object");
    int i = 0;
    for (String member : struct.getMembers()) {
        visitor.visitInsn(DUP);
        loadInteger(visitor, i);
        visitor.visitVarInsn(ALOAD, 0);
        visitor.visitFieldInsn(GETFIELD, owner, member, "Ljava/lang/Object;");
        visitor.visitInsn(AASTORE);
        i = i + 1;
    }
    visitor.visitMethodInsn(INVOKESTATIC, "java/util/Objects", "hash", "([Ljava/lang/Object;)I");
    visitor.visitInsn(IRETURN);
    visitor.visitMaxs(0, 0);
    visitor.visitEnd();
}

From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeStructGenerator.java

License:Apache License

private void makeSetter(ClassWriter classWriter, String owner, String name) {
    int accessFlag = name.startsWith("_") ? ACC_PRIVATE : ACC_PUBLIC;
    MethodVisitor visitor = classWriter.visitMethod(accessFlag, name,
            "(Ljava/lang/Object;)Lgololang/GoloStruct;", null, null);
    visitor.visitCode();//from   ww  w  .ja va  2s  .com
    visitor.visitVarInsn(ALOAD, 0);
    visitor.visitFieldInsn(GETFIELD, owner, $_frozen, "Z");
    Label setLabel = new Label();
    visitor.visitJumpInsn(IFEQ, setLabel);
    visitor.visitTypeInsn(NEW, "java/lang/IllegalStateException");
    visitor.visitInsn(DUP);
    visitor.visitLdcInsn("The struct instance is frozen");
    visitor.visitMethodInsn(INVOKESPECIAL, "java/lang/IllegalStateException", "<init>",
            "(Ljava/lang/String;)V");
    visitor.visitInsn(ATHROW);
    visitor.visitLabel(setLabel);
    visitor.visitVarInsn(ALOAD, 0);
    visitor.visitVarInsn(ALOAD, 1);
    visitor.visitFieldInsn(PUTFIELD, owner, name, "Ljava/lang/Object;");
    visitor.visitVarInsn(ALOAD, 0);
    visitor.visitInsn(ARETURN);
    visitor.visitMaxs(0, 0);
    visitor.visitEnd();
}

From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeUnionGenerator.java

License:Apache License

private void makeEquals(ClassWriter cw, Union.Value value) {
    String target = value.getPackageAndClass().toJVMType();
    MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "equals", "(Ljava/lang/Object;)Z", null, null);
    Label notSameInstance = new Label();
    Label notNull = new Label();
    Label sameType = new Label();
    Label allAttrsEquals = new Label();
    Label attrNotEqual = new Label();
    mv.visitCode();/*from   ww w. ja va2 s  .c  o  m*/

    // if (other == this) { return true; }
    mv.visitVarInsn(ALOAD, 1);
    mv.visitVarInsn(ALOAD, 0);
    mv.visitJumpInsn(IF_ACMPNE, notSameInstance);
    mv.visitInsn(ICONST_1);
    mv.visitInsn(IRETURN);
    mv.visitLabel(notSameInstance);

    // if (other == null) { return false; }
    mv.visitVarInsn(ALOAD, 1);
    mv.visitJumpInsn(IFNONNULL, notNull);
    mv.visitInsn(ICONST_0);
    mv.visitInsn(IRETURN);
    mv.visitLabel(notNull);

    // if (!(other instanceof <value>)) { return false; }
    mv.visitVarInsn(ALOAD, 1);
    mv.visitTypeInsn(INSTANCEOF, target);
    mv.visitJumpInsn(IFNE, sameType);
    mv.visitInsn(ICONST_0);
    mv.visitInsn(IRETURN);
    mv.visitLabel(sameType);

    // cast other to <value>
    mv.visitVarInsn(ALOAD, 1);
    mv.visitTypeInsn(CHECKCAST, target);
    mv.visitVarInsn(ASTORE, 2);

    // java.util.Objects.equals(<member>, other.<member>)
    for (String member : value.getMembers()) {
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, target, member, "Ljava/lang/Object;");
        mv.visitVarInsn(ALOAD, 2);
        mv.visitFieldInsn(GETFIELD, target, member, "Ljava/lang/Object;");
        mv.visitMethodInsn(INVOKESTATIC, "java/util/Objects", "equals",
                "(Ljava/lang/Object;Ljava/lang/Object;)Z", false);
        mv.visitJumpInsn(IFEQ, attrNotEqual);
    }
    mv.visitInsn(ICONST_1);
    mv.visitJumpInsn(GOTO, allAttrsEquals);
    mv.visitLabel(attrNotEqual);
    mv.visitInsn(ICONST_0);
    mv.visitLabel(allAttrsEquals);
    mv.visitInsn(IRETURN);
    mv.visitMaxs(0, 0);
    mv.visitEnd();
}

From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeUtils.java

License:Apache License

static void visitLine(GoloElement element, MethodVisitor visitor) {
    if (element.hasASTNode()) {
        Label label = new Label();
        visitor.visitLabel(label);
        visitor.visitLineNumber(element.getPositionInSourceCode().getLine(), label);
    }/*from   w  ww .  j a  v  a2s .  co m*/
}

From source file:fr.liglab.adele.cilia.dependency.ProxyGenerator.java

License:Apache License

/**
 * Generates a delegated method./*from  w  w w . j  a  v a2s .  c  om*/
 *
 * @param cw        the class writer
 * @param method    the method object to delegate
 * @param className the generated class name
 * @param itfName   the internal specification class name
 */
private static void generateDelegator(ClassWriter cw, Method method, String className, String itfName) {
    String methodName = method.getName();
    String desc = Type.getMethodDescriptor(method);
    String[] exceptions = getInternalClassNames(method.getExceptionTypes());
    int modifiers = method.getModifiers() & ~(Modifier.ABSTRACT | Modifier.NATIVE | Modifier.SYNCHRONIZED);
    Type[] types = Type.getArgumentTypes(method);

    int freeRoom = 1;
    for (int t = 0; t < types.length; t++) {
        freeRoom = freeRoom + types[t].getSize();
    }

    MethodVisitor mv = cw.visitMethod(modifiers, methodName, desc, null, exceptions);
    mv.visitCode();

    mv.visitVarInsn(ALOAD, 0);
    mv.visitFieldInsn(GETFIELD, className, DEPENDENCY, DEPENDENCY_DESC); // The dependency is on the stack.
    mv.visitMethodInsn(INVOKEVIRTUAL, DEPENDENCY_INTERNAL_NAME, "getService", // Call getService
            "()Ljava/lang/Object;"); // The service object is on the stack.
    int varSvc = freeRoom;
    freeRoom = freeRoom + 1; // Object Reference.
    mv.visitVarInsn(ASTORE, varSvc); // Store the service object.

    Label notNull = new Label();
    Label isNull = new Label();
    mv.visitVarInsn(ALOAD, varSvc); // Load the service
    mv.visitJumpInsn(IFNONNULL, notNull); // If not null go to not null
    // Null branch - throw the exception
    mv.visitLabel(isNull);
    mv.visitTypeInsn(NEW, "java/lang/RuntimeException");
    mv.visitInsn(DUP);
    mv.visitLdcInsn("No service available");
    mv.visitMethodInsn(INVOKESPECIAL, "java/lang/RuntimeException", "<init>", "(Ljava/lang/String;)V");
    mv.visitInsn(ATHROW);
    // End of the null branch

    // Not null, go one the execution
    mv.visitLabel(notNull);

    // Invoke the method on the service object.
    mv.visitVarInsn(ALOAD, varSvc);
    // Push argument on the stack.
    int i = 1; // Arguments. (non static method)
    for (int t = 0; t < types.length; t++) {
        mv.visitVarInsn(types[t].getOpcode(ILOAD), i);
        i = i + types[t].getSize();
    }
    // Invocation
    mv.visitMethodInsn(INVOKEINTERFACE, itfName, methodName, desc);

    // Return the result
    Type returnType = Type.getReturnType(desc);
    if (returnType.getSort() != Type.VOID) {
        mv.visitInsn(returnType.getOpcode(IRETURN));
    } else {
        mv.visitInsn(RETURN);
    }

    // End of the method.
    mv.visitMaxs(0, 0);
    mv.visitEnd();
}