Example usage for org.objectweb.asm MethodVisitor visitLdcInsn

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

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Introduction

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

Prototype

public void visitLdcInsn(final Object value)

Source Link

Document

Visits a LDC instruction.

Usage

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);//ww w.j  av a2s  .com
    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);// w  ww  .  j a  v  a 2 s .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 insertUnknowElementCode(Struct struct, MethodVisitor visitor) {
    visitor.visitTypeInsn(NEW, "java/lang/IllegalArgumentException");
    visitor.visitInsn(DUP);/*  w  w  w  .  ja  v a 2s . c  om*/
    visitor.visitLdcInsn("Unknown member in " + struct.getPackageAndClass().toString());
    visitor.visitMethodInsn(INVOKESPECIAL, "java/lang/IllegalArgumentException", "<init>",
            "(Ljava/lang/String;)V");
    visitor.visitInsn(ATHROW);
}

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

License:Apache License

private void makeToString(ClassWriter classWriter, Struct struct) {
    String owner = struct.getPackageAndClass().toJVMType();
    MethodVisitor visitor = classWriter.visitMethod(ACC_PUBLIC, "toString", "()Ljava/lang/String;", null, null);
    visitor.visitCode();//from  w  ww  . j a  v a  2s  .  co  m
    visitor.visitTypeInsn(NEW, "java/lang/StringBuilder");
    visitor.visitInsn(DUP);
    visitor.visitLdcInsn("struct " + struct.getPackageAndClass().className() + "{");
    visitor.visitMethodInsn(INVOKESPECIAL, "java/lang/StringBuilder", "<init>", "(Ljava/lang/String;)V");
    boolean first = true;
    for (String member : struct.getPublicMembers()) {
        visitor.visitInsn(DUP);
        visitor.visitLdcInsn((!first ? ", " : "") + member + "=");
        first = false;
        visitor.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append",
                "(Ljava/lang/String;)Ljava/lang/StringBuilder;");
        visitor.visitInsn(DUP);
        visitor.visitVarInsn(ALOAD, 0);
        visitor.visitFieldInsn(GETFIELD, owner, member, "Ljava/lang/Object;");
        visitor.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append",
                "(Ljava/lang/Object;)Ljava/lang/StringBuilder;");
    }
    visitor.visitLdcInsn("}");
    visitor.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append",
            "(Ljava/lang/String;)Ljava/lang/StringBuilder;");
    visitor.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "toString", "()Ljava/lang/String;");
    visitor.visitInsn(ARETURN);
    visitor.visitMaxs(0, 0);
    visitor.visitEnd();
}

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

License:Apache License

private void initMembersField(Struct struct, String owner, MethodVisitor visitor) {
    int arg;//w ww  .  j  av  a2 s.c om
    visitor.visitVarInsn(ALOAD, 0);
    loadInteger(visitor, struct.getPublicMembers().size());
    visitor.visitTypeInsn(ANEWARRAY, "java/lang/String");
    arg = 0;
    for (String name : struct.getPublicMembers()) {
        visitor.visitInsn(DUP);
        loadInteger(visitor, arg);
        visitor.visitLdcInsn(name);
        visitor.visitInsn(AASTORE);
        arg = arg + 1;
    }
    visitor.visitFieldInsn(PUTFIELD, owner, "members", "[Ljava/lang/String;");
}

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();/*w  w  w.j a va  2s.  co  m*/
    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 makeToString(ClassWriter classWriter, Union.Value value) {
    MethodVisitor visitor = classWriter.visitMethod(ACC_PUBLIC, "toString", "()Ljava/lang/String;", null, null);
    visitor.visitCode();//from  www. ja  va 2  s.c  o m
    if (!value.hasMembers()) {
        visitor.visitLdcInsn(
                "union " + value.getUnion().getPackageAndClass().className() + "." + value.getName());
    } else {
        visitor.visitTypeInsn(NEW, "java/lang/StringBuilder");
        visitor.visitInsn(DUP);
        visitor.visitLdcInsn(
                "union " + value.getUnion().getPackageAndClass().className() + "." + value.getName() + "{");
        visitor.visitMethodInsn(INVOKESPECIAL, "java/lang/StringBuilder", "<init>", "(Ljava/lang/String;)V",
                false);
        visitor.visitVarInsn(ASTORE, 1);
        boolean first = true;
        for (String member : value.getMembers()) {
            visitor.visitVarInsn(ALOAD, 1);
            visitor.visitLdcInsn((first ? "" : ", ") + member + "=");
            visitor.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append",
                    "(Ljava/lang/String;)Ljava/lang/StringBuilder;", false);
            visitor.visitInsn(POP);

            visitor.visitVarInsn(ALOAD, 1);
            visitor.visitVarInsn(ALOAD, 0);
            visitor.visitFieldInsn(GETFIELD, value.getPackageAndClass().toJVMType(), member,
                    "Ljava/lang/Object;");
            visitor.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append",
                    "(Ljava/lang/Object;)Ljava/lang/StringBuilder;", false);
            visitor.visitInsn(POP);
            first = false;
        }

        visitor.visitVarInsn(ALOAD, 1);
        visitor.visitLdcInsn("}");
        visitor.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append",
                "(Ljava/lang/String;)Ljava/lang/StringBuilder;", false);
        visitor.visitInsn(POP);
        visitor.visitVarInsn(ALOAD, 1);
        visitor.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "toString", "()Ljava/lang/String;",
                false);
    }
    visitor.visitInsn(ARETURN);
    visitor.visitMaxs(0, 0);
    visitor.visitEnd();
}

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

License:Apache License

static void loadInteger(MethodVisitor methodVisitor, int value) {
    if (between(value, Short.MIN_VALUE, Short.MAX_VALUE)) {
        if (between(value, Byte.MIN_VALUE, Byte.MAX_VALUE)) {
            if (between(value, -1, 5)) {
                methodVisitor.visitInsn(ICONST[value + 1]);
            } else {
                methodVisitor.visitIntInsn(BIPUSH, value);
            }/*from   w  w w . j a v  a2 s  .  co m*/
        } else {
            methodVisitor.visitIntInsn(SIPUSH, value);
        }
    } else {
        methodVisitor.visitLdcInsn(value);
    }
}

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

License:Apache License

static void loadLong(MethodVisitor methodVisitor, long value) {
    if (value == 0) {
        methodVisitor.visitInsn(LCONST_0);
    } else if (value == 1) {
        methodVisitor.visitInsn(LCONST_1);
    } else {/*from w  w w  . j av a2 s . co m*/
        methodVisitor.visitLdcInsn(value);
    }
}

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

License:Apache License

/**
 * Generates a delegated method./* w  w  w  .j  av  a 2s  .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();
}