Example usage for org.objectweb.asm MethodVisitor visitInsn

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

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Introduction

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

Prototype

public void visitInsn(final int opcode)

Source Link

Document

Visits a zero operand instruction.

Usage

From source file:com.ibm.layout.ImplHelper.java

License:Open Source License

static void getLayoutImpl(ClassVisitor cw, MethodVisitor mv, String typeName) {
    {//from www  .j  a va 2 s  .c  om
        mv = cw.visitMethod(ACC_PUBLIC, "copyFrom", "(Lcom/ibm/layout/Layout;)V", null, null);
        mv.visitCode();
        mv.visitFieldInsn(GETSTATIC, typeName, "unsafe", "Lsun/misc/Unsafe;");
        mv.visitVarInsn(ALOAD, 1);
        mv.visitTypeInsn(CHECKCAST, typeName);
        mv.visitFieldInsn(GETFIELD, typeName, "location", "Lcom/ibm/layout/Location;");
        mv.visitMethodInsn(INVOKEVIRTUAL, "com/ibm/layout/Location", "getData", "()[B", false);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitTypeInsn(CHECKCAST, typeName);
        mv.visitFieldInsn(GETFIELD, typeName, "location", "Lcom/ibm/layout/Location;");
        mv.visitMethodInsn(INVOKEVIRTUAL, "com/ibm/layout/Location", "getOffset", "()J", false);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, typeName, "location", "Lcom/ibm/layout/Location;");
        mv.visitMethodInsn(INVOKEVIRTUAL, "com/ibm/layout/Location", "getData", "()[B", false);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, typeName, "location", "Lcom/ibm/layout/Location;");
        mv.visitMethodInsn(INVOKEVIRTUAL, "com/ibm/layout/Location", "getOffset", "()J", false);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKEVIRTUAL, typeName, "sizeof", "()J", false);
        mv.visitMethodInsn(INVOKEVIRTUAL, "sun/misc/Unsafe", "copyMemory",
                "(Ljava/lang/Object;JLjava/lang/Object;JJ)V", false);
        mv.visitInsn(RETURN);
        mv.visitMaxs(9, 2);
        mv.visitEnd();
    }
}

From source file:com.ibm.layout.ImplHelper.java

License:Open Source License

static void genLayoutTypeImpl(ClassVisitor cw, MethodVisitor mv, FieldVisitor fv, String typeName,
        boolean layoutContainsVLA) {
    {/*from w w  w .  java  2  s  .c o  m*/
        fv = cw.visitField(ACC_PRIVATE + ACC_FINAL + ACC_STATIC, "unsafe", "Lsun/misc/Unsafe;", null, null);
        fv.visitEnd();
    }
    {
        mv = cw.visitMethod(ACC_PUBLIC, "containsVLA", "()Z", null, null);
        mv.visitCode();
        //if layout contains VLA return true, otherwise false
        if (layoutContainsVLA) {
            mv.visitInsn(ICONST_1);
        } else {
            mv.visitInsn(ICONST_0);
        }
        mv.visitInsn(IRETURN);
        mv.visitMaxs(1, 1);
        mv.visitEnd();
    }
    {
        fv = cw.visitField(ACC_PROTECTED, "location", "Lcom/ibm/layout/Location;", null, null);
        fv.visitEnd();
    }
    {
        mv = cw.visitMethod(ACC_PUBLIC, "bindLocation", "(Lcom/ibm/layout/Location;)V", null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 1);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKEVIRTUAL, typeName, "sizeof", "()J", false);
        mv.visitMethodInsn(INVOKEVIRTUAL, "com/ibm/layout/Location", "checkDataFits", "(J)Z", false);
        Label l0 = new Label();
        mv.visitJumpInsn(IFEQ, l0);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitFieldInsn(PUTFIELD, typeName, "location", "Lcom/ibm/layout/Location;");
        mv.visitLabel(l0);
        mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
        mv.visitInsn(RETURN);
        mv.visitMaxs(3, 2);
        mv.visitEnd();
    }
    {
        mv = cw.visitMethod(ACC_PUBLIC + ACC_FINAL, "writeToByteArray", "(J[BII)I", null, null);
        mv.visitCode();
        mv.visitVarInsn(ILOAD, 5);
        mv.visitInsn(I2L);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKEVIRTUAL, typeName, "sizeof", "()J", false);
        mv.visitInsn(LCMP);
        Label l0 = new Label();
        mv.visitJumpInsn(IFLE, l0);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKEVIRTUAL, typeName, "sizeof", "()J", false);
        mv.visitInsn(L2I);
        mv.visitVarInsn(ISTORE, 5);
        mv.visitLabel(l0);
        mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, typeName, "location", "Lcom/ibm/layout/Location;");
        mv.visitMethodInsn(INVOKEVIRTUAL, "com/ibm/layout/Location", "getData", "()[B", false);
        Label l1 = new Label();
        mv.visitJumpInsn(IFNULL, l1);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, typeName, "location", "Lcom/ibm/layout/Location;");
        mv.visitMethodInsn(INVOKEVIRTUAL, "com/ibm/layout/Location", "getData", "()[B", false);
        mv.visitVarInsn(LLOAD, 1);
        mv.visitInsn(L2I);
        mv.visitVarInsn(ALOAD, 3);
        mv.visitVarInsn(ILOAD, 4);
        mv.visitVarInsn(ILOAD, 5);
        mv.visitMethodInsn(INVOKESTATIC, "java/lang/System", "arraycopy",
                "(Ljava/lang/Object;ILjava/lang/Object;II)V", false);
        Label l2 = new Label();
        mv.visitJumpInsn(GOTO, l2);
        mv.visitLabel(l1);
        mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
        mv.visitFieldInsn(GETSTATIC, typeName, "unsafe", "Lsun/misc/Unsafe;");
        mv.visitInsn(ACONST_NULL);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, typeName, "location", "Lcom/ibm/layout/Location;");
        mv.visitMethodInsn(INVOKEVIRTUAL, "com/ibm/layout/Location", "getOffset", "()J", false);
        mv.visitVarInsn(LLOAD, 1);
        mv.visitInsn(LADD);
        mv.visitVarInsn(ALOAD, 3);
        mv.visitFieldInsn(GETSTATIC, typeName, "unsafe", "Lsun/misc/Unsafe;");
        mv.visitVarInsn(ALOAD, 3);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "getClass", "()Ljava/lang/Class;", false);
        mv.visitMethodInsn(INVOKEVIRTUAL, "sun/misc/Unsafe", "arrayBaseOffset", "(Ljava/lang/Class;)I", false);
        mv.visitInsn(I2L);
        mv.visitVarInsn(ILOAD, 5);
        mv.visitInsn(I2L);
        mv.visitMethodInsn(INVOKEVIRTUAL, "sun/misc/Unsafe", "copyMemory",
                "(Ljava/lang/Object;JLjava/lang/Object;JJ)V", false);
        mv.visitLabel(l2);
        mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
        mv.visitVarInsn(ILOAD, 5);
        mv.visitInsn(IRETURN);
        mv.visitMaxs(9, 6);
        mv.visitEnd();
    }
    {
        mv = cw.visitMethod(ACC_PUBLIC + ACC_FINAL, "readFromByteArray", "(J[BII)I", null, null);
        mv.visitCode();
        mv.visitVarInsn(ILOAD, 5);
        mv.visitInsn(I2L);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKEVIRTUAL, typeName, "sizeof", "()J", false);
        mv.visitInsn(LCMP);
        Label l0 = new Label();
        mv.visitJumpInsn(IFLE, l0);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKEVIRTUAL, typeName, "sizeof", "()J", false);
        mv.visitInsn(L2I);
        mv.visitVarInsn(ISTORE, 5);
        mv.visitLabel(l0);
        mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, typeName, "location", "Lcom/ibm/layout/Location;");
        mv.visitMethodInsn(INVOKEVIRTUAL, "com/ibm/layout/Location", "getData", "()[B", false);
        Label l1 = new Label();
        mv.visitJumpInsn(IFNULL, l1);
        mv.visitVarInsn(ALOAD, 3);
        mv.visitVarInsn(ILOAD, 4);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, typeName, "location", "Lcom/ibm/layout/Location;");
        mv.visitMethodInsn(INVOKEVIRTUAL, "com/ibm/layout/Location", "getData", "()[B", false);
        mv.visitVarInsn(LLOAD, 1);
        mv.visitInsn(L2I);
        mv.visitVarInsn(ILOAD, 5);
        mv.visitMethodInsn(INVOKESTATIC, "java/lang/System", "arraycopy",
                "(Ljava/lang/Object;ILjava/lang/Object;II)V", false);
        Label l2 = new Label();
        mv.visitJumpInsn(GOTO, l2);
        mv.visitLabel(l1);
        mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
        mv.visitFieldInsn(GETSTATIC, typeName, "unsafe", "Lsun/misc/Unsafe;");
        mv.visitVarInsn(ALOAD, 3);
        mv.visitFieldInsn(GETSTATIC, typeName, "unsafe", "Lsun/misc/Unsafe;");
        mv.visitVarInsn(ALOAD, 3);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Object", "getClass", "()Ljava/lang/Class;", false);
        mv.visitMethodInsn(INVOKEVIRTUAL, "sun/misc/Unsafe", "arrayBaseOffset", "(Ljava/lang/Class;)I", false);
        mv.visitVarInsn(ILOAD, 4);
        mv.visitInsn(IADD);
        mv.visitInsn(I2L);
        mv.visitInsn(ACONST_NULL);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, typeName, "location", "Lcom/ibm/layout/Location;");
        mv.visitMethodInsn(INVOKEVIRTUAL, "com/ibm/layout/Location", "getOffset", "()J", false);
        mv.visitVarInsn(LLOAD, 1);
        mv.visitInsn(LADD);
        mv.visitVarInsn(ILOAD, 5);
        mv.visitInsn(I2L);
        mv.visitMethodInsn(INVOKEVIRTUAL, "sun/misc/Unsafe", "copyMemory",
                "(Ljava/lang/Object;JLjava/lang/Object;JJ)V", false);
        mv.visitLabel(l2);
        mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
        mv.visitVarInsn(ILOAD, 5);
        mv.visitInsn(IRETURN);
        mv.visitMaxs(9, 6);
        mv.visitEnd();
    }
    {
        mv = cw.visitMethod(ACC_PUBLIC + ACC_FINAL, "asByteBuffer", "()Ljava/nio/ByteBuffer;", null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, typeName, "location", "Lcom/ibm/layout/Location;");
        mv.visitMethodInsn(INVOKEVIRTUAL, "com/ibm/layout/Location", "getData", "()[B", false);
        Label l0 = new Label();
        mv.visitJumpInsn(IFNULL, l0);
        mv.visitTypeInsn(NEW, "java/lang/UnsupportedOperationException");
        mv.visitInsn(DUP);
        mv.visitLdcInsn("not off-heap");
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/UnsupportedOperationException", "<init>",
                "(Ljava/lang/String;)V", false);
        mv.visitInsn(ATHROW);
        mv.visitLabel(l0);
        mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, typeName, "location", "Lcom/ibm/layout/Location;");
        mv.visitMethodInsn(INVOKEVIRTUAL, "com/ibm/layout/Location", "getOffset", "()J", false);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKEVIRTUAL, typeName, "sizeof", "()J", false);
        mv.visitMethodInsn(INVOKESTATIC, "com/ibm/layout/UnsafeHelper", "bufferFromAddress",
                "(JJ)Ljava/nio/ByteBuffer;", false);
        mv.visitVarInsn(ASTORE, 1);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitMethodInsn(INVOKESTATIC, "java/nio/ByteOrder", "nativeOrder", "()Ljava/nio/ByteOrder;", false);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/nio/ByteBuffer", "order",
                "(Ljava/nio/ByteOrder;)Ljava/nio/ByteBuffer;", false);
        mv.visitInsn(POP);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitInsn(ARETURN);
        mv.visitMaxs(4, 2);
        mv.visitEnd();
    }
    {
        mv = cw.visitMethod(ACC_PUBLIC + ACC_FINAL + ACC_STATIC, "asByteBuffer",
                "(Lcom/ibm/layout/Location;J)Ljava/nio/ByteBuffer;", null, null);
        mv.visitCode();
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKEVIRTUAL, "com/ibm/layout/Location", "getData", "()[B", false);
        Label l0 = new Label();
        mv.visitJumpInsn(IFNULL, l0);
        mv.visitTypeInsn(NEW, "java/lang/UnsupportedOperationException");
        mv.visitInsn(DUP);
        mv.visitLdcInsn("not off-heap");
        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/UnsupportedOperationException", "<init>",
                "(Ljava/lang/String;)V", false);
        mv.visitInsn(ATHROW);
        mv.visitLabel(l0);
        mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitMethodInsn(INVOKEVIRTUAL, "com/ibm/layout/Location", "getOffset", "()J", false);
        mv.visitVarInsn(LLOAD, 1);
        mv.visitMethodInsn(INVOKESTATIC, "com/ibm/layout/UnsafeHelper", "bufferFromAddress",
                "(JJ)Ljava/nio/ByteBuffer;", false);
        mv.visitVarInsn(ASTORE, 3);
        mv.visitVarInsn(ALOAD, 3);
        mv.visitMethodInsn(INVOKESTATIC, "java/nio/ByteOrder", "nativeOrder", "()Ljava/nio/ByteOrder;", false);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/nio/ByteBuffer", "order",
                "(Ljava/nio/ByteOrder;)Ljava/nio/ByteBuffer;", false);
        mv.visitInsn(POP);
        mv.visitVarInsn(ALOAD, 3);
        mv.visitInsn(ARETURN);
        mv.visitMaxs(4, 4);
        mv.visitEnd();
    }
    {
        mv = cw.visitMethod(ACC_PUBLIC + ACC_FINAL, "unsafeCast", "(Ljava/lang/Class;)Lcom/ibm/layout/Layout;",
                "<T::Lcom/ibm/layout/Layout;>(Ljava/lang/Class<TT;>;)TT;", null);
        mv.visitCode();
        Label l0 = new Label();
        Label l1 = new Label();
        Label l2 = new Label();
        mv.visitTryCatchBlock(l0, l1, l2, "java/lang/NoSuchMethodException");
        Label l3 = new Label();
        mv.visitTryCatchBlock(l0, l1, l3, "java/lang/SecurityException");
        Label l4 = new Label();
        mv.visitTryCatchBlock(l0, l1, l4, "java/lang/InstantiationException");
        Label l5 = new Label();
        mv.visitTryCatchBlock(l0, l1, l5, "java/lang/IllegalAccessException");
        Label l6 = new Label();
        mv.visitTryCatchBlock(l0, l1, l6, "java/lang/IllegalArgumentException");
        Label l7 = new Label();
        mv.visitTryCatchBlock(l0, l1, l7, "java/lang/reflect/InvocationTargetException");
        mv.visitLabel(l0);
        mv.visitMethodInsn(INVOKESTATIC, "com/ibm/layout/LayoutHelper", "getFactory",
                "()Lcom/ibm/layout/LayoutHelper;", false);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitMethodInsn(INVOKEVIRTUAL, "com/ibm/layout/LayoutHelper", "genLayoutImpl",
                "(Ljava/lang/Class;)Ljava/lang/Class;", false);
        mv.visitVarInsn(ASTORE, 2);
        mv.visitVarInsn(ALOAD, 2);
        mv.visitInsn(ICONST_0);
        mv.visitTypeInsn(ANEWARRAY, "java/lang/Class");
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Class", "getDeclaredConstructor",
                "([Ljava/lang/Class;)Ljava/lang/reflect/Constructor;", false);
        mv.visitVarInsn(ASTORE, 3);
        mv.visitVarInsn(ALOAD, 3);
        mv.visitInsn(ICONST_1);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Constructor", "setAccessible", "(Z)V", false);
        mv.visitVarInsn(ALOAD, 3);
        mv.visitInsn(ICONST_0);
        mv.visitTypeInsn(ANEWARRAY, "java/lang/Object");
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Constructor", "newInstance",
                "([Ljava/lang/Object;)Ljava/lang/Object;", false);
        mv.visitTypeInsn(CHECKCAST, "com/ibm/layout/Layout");
        mv.visitVarInsn(ASTORE, 4);
        mv.visitVarInsn(ALOAD, 4);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, typeName, "location", "Lcom/ibm/layout/Location;");
        mv.visitMethodInsn(INVOKEINTERFACE, "com/ibm/layout/Layout", "bindLocation",
                "(Lcom/ibm/layout/Location;)V", true);
        mv.visitVarInsn(ALOAD, 4);
        mv.visitLabel(l1);
        mv.visitInsn(ARETURN);
        mv.visitLabel(l2);
        mv.visitFrame(Opcodes.F_SAME1, 0, null, 1, new Object[] { "java/lang/NoSuchMethodException" });
        mv.visitVarInsn(ASTORE, 2);
        mv.visitVarInsn(ALOAD, 2);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/NoSuchMethodException", "printStackTrace", "()V", false);
        Label l8 = new Label();
        mv.visitJumpInsn(GOTO, l8);
        mv.visitLabel(l3);
        mv.visitFrame(Opcodes.F_SAME1, 0, null, 1, new Object[] { "java/lang/SecurityException" });
        mv.visitVarInsn(ASTORE, 2);
        mv.visitVarInsn(ALOAD, 2);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/SecurityException", "printStackTrace", "()V", false);
        mv.visitJumpInsn(GOTO, l8);
        mv.visitLabel(l4);
        mv.visitFrame(Opcodes.F_SAME1, 0, null, 1, new Object[] { "java/lang/InstantiationException" });
        mv.visitVarInsn(ASTORE, 2);
        mv.visitVarInsn(ALOAD, 2);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/InstantiationException", "printStackTrace", "()V", false);
        mv.visitJumpInsn(GOTO, l8);
        mv.visitLabel(l5);
        mv.visitFrame(Opcodes.F_SAME1, 0, null, 1, new Object[] { "java/lang/IllegalAccessException" });
        mv.visitVarInsn(ASTORE, 2);
        mv.visitVarInsn(ALOAD, 2);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/IllegalAccessException", "printStackTrace", "()V", false);
        mv.visitJumpInsn(GOTO, l8);
        mv.visitLabel(l6);
        mv.visitFrame(Opcodes.F_SAME1, 0, null, 1, new Object[] { "java/lang/IllegalArgumentException" });
        mv.visitVarInsn(ASTORE, 2);
        mv.visitVarInsn(ALOAD, 2);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/IllegalArgumentException", "printStackTrace", "()V",
                false);
        mv.visitJumpInsn(GOTO, l8);
        mv.visitLabel(l7);
        mv.visitFrame(Opcodes.F_SAME1, 0, null, 1,
                new Object[] { "java/lang/reflect/InvocationTargetException" });
        mv.visitVarInsn(ASTORE, 2);
        mv.visitVarInsn(ALOAD, 2);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/InvocationTargetException", "printStackTrace",
                "()V", false);
        mv.visitLabel(l8);
        mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
        mv.visitInsn(ACONST_NULL);
        mv.visitInsn(ARETURN);
        mv.visitMaxs(2, 5);
        mv.visitEnd();
    }
    {
        mv = cw.visitMethod(ACC_PUBLIC + ACC_FINAL, "unsafeCast",
                "(Ljava/lang/Class;J)Lcom/ibm/layout/Array1D;",
                "<T::Lcom/ibm/layout/Layout;>(Ljava/lang/Class<TT;>;J)Lcom/ibm/layout/Array1D<TT;>;", null);
        mv.visitCode();
        Label l0 = new Label();
        Label l1 = new Label();
        Label l2 = new Label();
        mv.visitTryCatchBlock(l0, l1, l2, "java/lang/NoSuchMethodException");
        Label l3 = new Label();
        mv.visitTryCatchBlock(l0, l1, l3, "java/lang/SecurityException");
        Label l4 = new Label();
        mv.visitTryCatchBlock(l0, l1, l4, "java/lang/InstantiationException");
        Label l5 = new Label();
        mv.visitTryCatchBlock(l0, l1, l5, "java/lang/IllegalAccessException");
        Label l6 = new Label();
        mv.visitTryCatchBlock(l0, l1, l6, "java/lang/IllegalArgumentException");
        Label l7 = new Label();
        mv.visitTryCatchBlock(l0, l1, l7, "java/lang/reflect/InvocationTargetException");
        mv.visitLabel(l0);
        mv.visitMethodInsn(INVOKESTATIC, "com/ibm/layout/LayoutHelper", "getFactory",
                "()Lcom/ibm/layout/LayoutHelper;", false);
        mv.visitVarInsn(ASTORE, 4);
        mv.visitVarInsn(ALOAD, 4);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitMethodInsn(INVOKEVIRTUAL, "com/ibm/layout/LayoutHelper", "genLayoutImpl",
                "(Ljava/lang/Class;)Ljava/lang/Class;", false);
        mv.visitVarInsn(ASTORE, 5);
        mv.visitVarInsn(ALOAD, 5);
        mv.visitInsn(ICONST_0);
        mv.visitTypeInsn(ANEWARRAY, "java/lang/Class");
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Class", "getDeclaredConstructor",
                "([Ljava/lang/Class;)Ljava/lang/reflect/Constructor;", false);
        mv.visitVarInsn(ASTORE, 6);
        mv.visitVarInsn(ALOAD, 6);
        mv.visitInsn(ICONST_1);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Constructor", "setAccessible", "(Z)V", false);
        mv.visitVarInsn(ALOAD, 6);
        mv.visitInsn(ICONST_0);
        mv.visitTypeInsn(ANEWARRAY, "java/lang/Object");
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Constructor", "newInstance",
                "([Ljava/lang/Object;)Ljava/lang/Object;", false);
        mv.visitTypeInsn(CHECKCAST, "com/ibm/layout/Layout");
        mv.visitMethodInsn(INVOKEINTERFACE, "com/ibm/layout/Layout", "sizeof", "()J", true);
        mv.visitVarInsn(LSTORE, 7);
        mv.visitVarInsn(ALOAD, 4);
        mv.visitVarInsn(ALOAD, 1);
        mv.visitMethodInsn(INVOKEVIRTUAL, "com/ibm/layout/LayoutHelper", "genArray1DImpl",
                "(Ljava/lang/Class;)Ljava/lang/Class;", false);
        mv.visitVarInsn(ASTORE, 9);
        mv.visitVarInsn(ALOAD, 9);
        mv.visitInsn(ICONST_2);
        mv.visitTypeInsn(ANEWARRAY, "java/lang/Class");
        mv.visitInsn(DUP);
        mv.visitInsn(ICONST_0);
        mv.visitFieldInsn(GETSTATIC, "java/lang/Long", "TYPE", "Ljava/lang/Class;");
        mv.visitInsn(AASTORE);
        mv.visitInsn(DUP);
        mv.visitInsn(ICONST_1);
        mv.visitFieldInsn(GETSTATIC, "java/lang/Long", "TYPE", "Ljava/lang/Class;");
        mv.visitInsn(AASTORE);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Class", "getDeclaredConstructor",
                "([Ljava/lang/Class;)Ljava/lang/reflect/Constructor;", false);
        mv.visitVarInsn(ASTORE, 10);
        mv.visitVarInsn(ALOAD, 10);
        mv.visitInsn(ICONST_1);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Constructor", "setAccessible", "(Z)V", false);
        mv.visitVarInsn(ALOAD, 10);
        mv.visitInsn(ICONST_2);
        mv.visitTypeInsn(ANEWARRAY, "java/lang/Object");
        mv.visitInsn(DUP);
        mv.visitInsn(ICONST_0);
        mv.visitVarInsn(LLOAD, 2);
        mv.visitMethodInsn(INVOKESTATIC, "java/lang/Long", "valueOf", "(J)Ljava/lang/Long;", false);
        mv.visitInsn(AASTORE);
        mv.visitInsn(DUP);
        mv.visitInsn(ICONST_1);
        mv.visitVarInsn(LLOAD, 7);
        mv.visitMethodInsn(INVOKESTATIC, "java/lang/Long", "valueOf", "(J)Ljava/lang/Long;", false);
        mv.visitInsn(AASTORE);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/Constructor", "newInstance",
                "([Ljava/lang/Object;)Ljava/lang/Object;", false);
        mv.visitTypeInsn(CHECKCAST, "com/ibm/layout/Array1D");
        mv.visitVarInsn(ASTORE, 11);
        mv.visitVarInsn(ALOAD, 11);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitFieldInsn(GETFIELD, typeName, "location", "Lcom/ibm/layout/Location;");
        mv.visitMethodInsn(INVOKEINTERFACE, "com/ibm/layout/Array1D", "bindLocation",
                "(Lcom/ibm/layout/Location;)V", true);
        mv.visitVarInsn(ALOAD, 11);
        mv.visitLabel(l1);
        mv.visitInsn(ARETURN);
        mv.visitLabel(l2);
        mv.visitFrame(Opcodes.F_SAME1, 0, null, 1, new Object[] { "java/lang/NoSuchMethodException" });
        mv.visitVarInsn(ASTORE, 4);
        mv.visitVarInsn(ALOAD, 4);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/NoSuchMethodException", "printStackTrace", "()V", false);
        Label l8 = new Label();
        mv.visitJumpInsn(GOTO, l8);
        mv.visitLabel(l3);
        mv.visitFrame(Opcodes.F_SAME1, 0, null, 1, new Object[] { "java/lang/SecurityException" });
        mv.visitVarInsn(ASTORE, 4);
        mv.visitVarInsn(ALOAD, 4);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/SecurityException", "printStackTrace", "()V", false);
        mv.visitJumpInsn(GOTO, l8);
        mv.visitLabel(l4);
        mv.visitFrame(Opcodes.F_SAME1, 0, null, 1, new Object[] { "java/lang/InstantiationException" });
        mv.visitVarInsn(ASTORE, 4);
        mv.visitVarInsn(ALOAD, 4);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/InstantiationException", "printStackTrace", "()V", false);
        mv.visitJumpInsn(GOTO, l8);
        mv.visitLabel(l5);
        mv.visitFrame(Opcodes.F_SAME1, 0, null, 1, new Object[] { "java/lang/IllegalAccessException" });
        mv.visitVarInsn(ASTORE, 4);
        mv.visitVarInsn(ALOAD, 4);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/IllegalAccessException", "printStackTrace", "()V", false);
        mv.visitJumpInsn(GOTO, l8);
        mv.visitLabel(l6);
        mv.visitFrame(Opcodes.F_SAME1, 0, null, 1, new Object[] { "java/lang/IllegalArgumentException" });
        mv.visitVarInsn(ASTORE, 4);
        mv.visitVarInsn(ALOAD, 4);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/IllegalArgumentException", "printStackTrace", "()V",
                false);
        mv.visitJumpInsn(GOTO, l8);
        mv.visitLabel(l7);
        mv.visitFrame(Opcodes.F_SAME1, 0, null, 1,
                new Object[] { "java/lang/reflect/InvocationTargetException" });
        mv.visitVarInsn(ASTORE, 4);
        mv.visitVarInsn(ALOAD, 4);
        mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/reflect/InvocationTargetException", "printStackTrace",
                "()V", false);
        mv.visitLabel(l8);
        mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
        mv.visitInsn(ACONST_NULL);
        mv.visitInsn(ARETURN);
        mv.visitMaxs(6, 12);
        mv.visitEnd();
    }
}

From source file:com.khubla.jvmbasic.jvmbasicc.JVMBasicCompiler.java

License:Open Source License

/**
 * generate init./*from www .  j  a va  2s.co  m*/
 * <p>
 * This inits the class members and assigns class members, such as the ExecutionContext.
 * </p>
 * <p>
 * <code>
 * public ExecutionContext executionContext = new ExecutionContext();
 * </code>
 * </p>
 */
protected void generateInit(String className, ClassWriter classWriter) throws Exception {
    try {
        final MethodVisitor methodVisitor = classWriter.visitMethod(Opcodes.ACC_PUBLIC, "<init>", "()V", null,
                null);
        methodVisitor.visitCode();
        /*
         * call init()
         */
        final Label l0 = new Label();
        methodVisitor.visitLabel(l0);
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
        methodVisitor.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
        /*
         * create a new execution context and assign it
         */
        final Label l1 = new Label();
        methodVisitor.visitLabel(l1);
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
        methodVisitor.visitTypeInsn(Opcodes.NEW, RTLHelper.JASIC_RUNTIME_EXECUTIONCONTEXT);
        methodVisitor.visitInsn(Opcodes.DUP);
        methodVisitor.visitMethodInsn(Opcodes.INVOKESPECIAL, RTLHelper.JASIC_RUNTIME_EXECUTIONCONTEXT, "<init>",
                "()V");
        methodVisitor.visitFieldInsn(Opcodes.PUTFIELD, className, RTLHelper.EXECUTIONCONTEXT_NAME,
                RTLHelper.JASIC_RUNTIME_EXECUTIONCONTEXT_TYPE);
        /*
         * return
         */
        final Label l2 = new Label();
        methodVisitor.visitLabel(l2);
        methodVisitor.visitLineNumber(8, l2);
        methodVisitor.visitInsn(Opcodes.RETURN);
        /*
         * declare variables
         */
        final Label l3 = new Label();
        methodVisitor.visitLabel(l3);
        methodVisitor.visitLocalVariable("this", "L" + className + ";", null, l0, l3, 0);
        methodVisitor.visitMaxs(3, 1);
        methodVisitor.visitEnd();
    } catch (final Exception e) {
        throw new Exception("Exception in generateInit", e);
    }
}

From source file:com.khubla.jvmbasic.jvmbasicc.JVMBasicCompiler.java

License:Open Source License

/**
 * generate void main(String[])/*from w  w w  . j a  v  a 2s.c om*/
 * <p>
 * <code>
 * public static void main(String[] args) {
 *   ExampleProgram exampleProgram = new ExampleProgram();
 *  try {
 *       exampleProgram.inputStream = System.in;
 *       exampleProgram.outputStream = System.out;
 *       exampleProgram.program();
 *   } catch (Exception e) {
 *       e.printStackTrace();
 *    }
 *  }
 * </code>
 * </p>
 */
protected void generateMain(String classname, ClassWriter classWriter) throws Exception {
    try {
        /*
         * make method
         */
        final MethodVisitor methodVisitor = classWriter.visitMethod(Opcodes.ACC_PUBLIC + Opcodes.ACC_STATIC,
                "main", "([Ljava/lang/String;)V", null, null);
        methodVisitor.visitCode();
        final Label l0 = new Label();
        final Label l1 = new Label();
        final Label l2 = new Label();
        methodVisitor.visitTryCatchBlock(l0, l1, l2, "java/lang/Exception");
        final Label l3 = new Label();
        methodVisitor.visitLabel(l3);
        /*
         * declare a local instance of the class in the void() main, store as variable 1.
         */
        methodVisitor.visitTypeInsn(Opcodes.NEW, classname);
        methodVisitor.visitInsn(Opcodes.DUP);
        methodVisitor.visitMethodInsn(Opcodes.INVOKESPECIAL, classname, "<init>", "()V");
        methodVisitor.visitVarInsn(Opcodes.ASTORE, 1);
        /*
         * assign the input stream
         */
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 1);
        methodVisitor.visitFieldInsn(Opcodes.GETSTATIC, "java/lang/System", "in", "Ljava/io/InputStream;");
        methodVisitor.visitFieldInsn(Opcodes.PUTFIELD, classname, "inputStream", "Ljava/io/InputStream;");
        /*
         * assign the output stream
         */
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 1);
        methodVisitor.visitFieldInsn(Opcodes.GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
        methodVisitor.visitFieldInsn(Opcodes.PUTFIELD, classname, "outputStream", "Ljava/io/PrintStream;");
        /*
         * load the class instance from variable 1 and call "program"
         */
        methodVisitor.visitLabel(l0);
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 1);
        methodVisitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, classname, "program", "()V");
        methodVisitor.visitLabel(l1);
        final Label l4 = new Label();
        methodVisitor.visitJumpInsn(Opcodes.GOTO, l4);
        methodVisitor.visitLabel(l2);
        methodVisitor.visitFrame(Opcodes.F_FULL, 2, new Object[] { "[Ljava/lang/String;", classname }, 1,
                new Object[] { "java/lang/Exception" });
        methodVisitor.visitVarInsn(Opcodes.ASTORE, 2);
        final Label l5 = new Label();
        methodVisitor.visitLabel(l5);
        methodVisitor.visitLineNumber(21, l5);
        methodVisitor.visitVarInsn(Opcodes.ALOAD, 2);
        methodVisitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/lang/Exception", "printStackTrace", "()V");
        /*
         * return
         */
        methodVisitor.visitLabel(l4);
        methodVisitor.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
        methodVisitor.visitInsn(Opcodes.RETURN);
        /*
         * declare the parameters
         */
        final Label l6 = new Label();
        methodVisitor.visitLabel(l6);
        methodVisitor.visitLocalVariable("args", "[Ljava/lang/String;", null, l3, l6, 0);
        methodVisitor.visitLocalVariable("exampleProgram", "L" + classname + ";", null, l0, l6, 1);
        methodVisitor.visitLocalVariable("e", "Ljava/lang/Exception;", null, l5, l4, 2);
        /*
         * done
         */
        methodVisitor.visitMaxs(2, 3);
        methodVisitor.visitEnd();
    } catch (final Exception e) {
        throw new Exception("Exception in generateMain", e);
    }
}

From source file:com.khubla.jvmbasic.jvmbasicc.JVMBasicCompiler.java

License:Open Source License

/**
 * Generate program/* w  w  w  . j a  v  a2s.  c om*/
 * <p>
 * Java prototype is "public program()"
 * </p>
 */
protected void generateProgram(String classname, ClassWriter classWriter, ProgContext progContext)
        throws Exception {
    try {
        final MethodVisitor methodVisitor = classWriter.visitMethod(Opcodes.ACC_PUBLIC, "program", "()V", null,
                new String[] { "java/lang/Exception" });
        methodVisitor.visitCode();
        /*
         * label for the start of the method
         */
        final Label l0 = new Label();
        methodVisitor.visitLabel(l0);
        /*
         * do the static analysis
         */
        final StaticAnalysis programStaticAnalysis = new StaticAnalysis();
        programStaticAnalysis.performStaticAnalysis(progContext);
        /*
         * show the static analysis
         */
        logger.info("Static analyis results for '" + classname + "'");
        programStaticAnalysis.showAnalysisResults();
        /*
         * recurse into the parse tree
         */
        final Function function = new progRule();
        final GenerationContext generationContext = new GenerationContext(classname, methodVisitor, classWriter,
                progContext, programStaticAnalysis);
        function.execute(generationContext);
        /*
         * return
         */
        final Label l1 = new Label();
        methodVisitor.visitLabel(l1);
        methodVisitor.visitInsn(Opcodes.RETURN);
        /*
         * declare the *this* local variable
         */
        final Label l2 = new Label();
        methodVisitor.visitLabel(l2);
        methodVisitor.visitLocalVariable("this", "L" + classname + ";", null, l0, l2, 0);
        /*
         * show all the other local variables
         */
        logger.info("JVM local variables");
        for (int i = 1; i < (GenerationContext.getLocalvariables().size() + 1); i++) {
            final LocalVariableDeclaration lvd = GenerationContext.getLocalvariables().get(i);
            logger.info("variable: " + lvd.getName() + " declared on line: " + lvd.getBasicLine()
                    + " frame index: " + lvd.getIndex());
        }
        /*
         * we are done
         */
        methodVisitor.visitMaxs(0, 1);
        methodVisitor.visitEnd();
    } catch (final Exception e) {
        throw new Exception("Exception in generateProgram", e);
    }
}

From source file:com.liferay.alloy.mvc.jsonwebservice.AlloyControllerInvokerManager.java

License:Open Source License

protected byte[] generateAlloyControllerInvokerClassData(Class<?> controllerClass,
        String alloyControllerInvokerClassName) throws NoClassNecessaryException {

    boolean jsonWebServiceMethodsPresent = false;

    ClassWriter classWriter = new ClassWriter(ClassWriter.COMPUTE_FRAMES);

    String alloyControllerInvokerClassBinaryName = getClassBinaryName(alloyControllerInvokerClassName);

    String baseAlloyControllerInvokerClassBinaryName = getClassBinaryName(
            BaseAlloyControllerInvokerImpl.class.getName());

    classWriter.visit(Opcodes.V1_5, Opcodes.ACC_PUBLIC | Opcodes.ACC_SUPER,
            alloyControllerInvokerClassBinaryName, null, baseAlloyControllerInvokerClassBinaryName, null);

    MethodVisitor methodVisitor = classWriter.visitMethod(Opcodes.ACC_PUBLIC, "<init>", "()V", null, null);

    methodVisitor.visitCode();/*ww w .  j a va 2 s  .c  o m*/
    methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
    methodVisitor.visitMethodInsn(Opcodes.INVOKESPECIAL, baseAlloyControllerInvokerClassBinaryName, "<init>",
            "()V");
    methodVisitor.visitInsn(Opcodes.RETURN);
    methodVisitor.visitMaxs(1, 1);
    methodVisitor.visitEnd();

    Method[] methods = controllerClass.getDeclaredMethods();

    for (Method method : methods) {
        if (!Modifier.isPublic(method.getModifiers())) {
            continue;
        }

        JSONWebServiceMethod jsonWebServiceMethod = method.getAnnotation(JSONWebServiceMethod.class);

        if (jsonWebServiceMethod == null) {
            continue;
        }

        jsonWebServiceMethodsPresent = true;

        Class<?>[] parameterTypes = jsonWebServiceMethod.parameterTypes();

        StringBundler sb = new StringBundler(parameterTypes.length + 3);

        sb.append(StringPool.OPEN_PARENTHESIS);

        for (Class<?> parameterType : parameterTypes) {
            sb.append(Type.getDescriptor(parameterType));
        }

        sb.append(StringPool.CLOSE_PARENTHESIS);
        sb.append(Type.getDescriptor(JSONSerializable.class));

        String methodDescriptor = sb.toString();

        methodVisitor = classWriter.visitMethod(Opcodes.ACC_PUBLIC, method.getName(), methodDescriptor, null,
                new String[] { getClassBinaryName(Exception.class.getName()) });

        methodVisitor.visitCode();

        for (int i = 0; i < parameterTypes.length; i++) {
            String parameterName = jsonWebServiceMethod.parameterNames()[i];
            Class<?> parameterType = parameterTypes[i];

            methodVisitor.visitLocalVariable(parameterName, Type.getDescriptor(parameterType), null,
                    new Label(), new Label(), i + 1);
        }

        methodVisitor.visitVarInsn(Opcodes.ALOAD, 0);
        methodVisitor.visitLdcInsn(jsonWebServiceMethod.lifecycle());

        methodVisitor.visitIntInsn(Opcodes.BIPUSH, parameterTypes.length * 2 + 2);
        methodVisitor.visitTypeInsn(Opcodes.ANEWARRAY, getClassBinaryName(Object.class.getName()));

        methodVisitor.visitInsn(Opcodes.DUP);
        methodVisitor.visitInsn(Opcodes.ICONST_0);
        methodVisitor.visitLdcInsn("action");
        methodVisitor.visitInsn(Opcodes.AASTORE);

        methodVisitor.visitInsn(Opcodes.DUP);
        methodVisitor.visitInsn(Opcodes.ICONST_1);
        methodVisitor.visitLdcInsn(method.getName());
        methodVisitor.visitInsn(Opcodes.AASTORE);

        for (int i = 0; i < parameterTypes.length; i++) {
            String parameterName = jsonWebServiceMethod.parameterNames()[i];

            methodVisitor.visitInsn(Opcodes.DUP);
            methodVisitor.visitIntInsn(Opcodes.BIPUSH, (i + 1) * 2);
            methodVisitor.visitLdcInsn(parameterName);
            methodVisitor.visitInsn(Opcodes.AASTORE);

            methodVisitor.visitInsn(Opcodes.DUP);
            methodVisitor.visitIntInsn(Opcodes.BIPUSH, (i + 1) * 2 + 1);
            methodVisitor.visitVarInsn(Opcodes.ALOAD, i + 1);
            methodVisitor.visitInsn(Opcodes.AASTORE);
        }

        sb = new StringBundler(5);

        sb.append(StringPool.OPEN_PARENTHESIS);
        sb.append(Type.getDescriptor(String.class));
        sb.append(Type.getDescriptor(Object[].class));
        sb.append(StringPool.CLOSE_PARENTHESIS);
        sb.append(Type.getDescriptor(JSONSerializable.class));

        methodVisitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, alloyControllerInvokerClassBinaryName,
                "invokeAlloyController", sb.toString());

        methodVisitor.visitInsn(Opcodes.ARETURN);

        methodVisitor.visitMaxs(-1, -1);
        methodVisitor.visitEnd();
    }

    classWriter.visitEnd();

    if (!jsonWebServiceMethodsPresent) {
        throw new NoClassNecessaryException();
    }

    return classWriter.toByteArray();
}

From source file:com.liferay.portal.upgrade.test.BaseBuildAutoUpgradeTestCase.java

License:Open Source License

private void _initTableColumns(MethodVisitor methodVisitor, Object[][] tableColumns) {

    methodVisitor.visitCode();/*from   w w  w .  ja  va  2s .  c om*/

    methodVisitor.visitInsn(Opcodes.ICONST_0 + tableColumns.length);
    methodVisitor.visitTypeInsn(Opcodes.ANEWARRAY, Type.getDescriptor(Object[].class));
    methodVisitor.visitInsn(Opcodes.DUP);

    for (int i = 0; i < tableColumns.length; i++) {
        Object[] tableColumn = tableColumns[i];

        methodVisitor.visitInsn(Opcodes.ICONST_0 + i);
        methodVisitor.visitInsn(Opcodes.ICONST_2);
        methodVisitor.visitTypeInsn(Opcodes.ANEWARRAY, Type.getInternalName(Object.class));
        methodVisitor.visitInsn(Opcodes.DUP);
        methodVisitor.visitInsn(Opcodes.ICONST_0);
        methodVisitor.visitLdcInsn(tableColumn[0]);
        methodVisitor.visitInsn(Opcodes.AASTORE);
        methodVisitor.visitInsn(Opcodes.DUP);
        methodVisitor.visitInsn(Opcodes.ICONST_1);
        methodVisitor.visitIntInsn(Opcodes.BIPUSH, (Integer) tableColumn[1]);
        methodVisitor.visitMethodInsn(Opcodes.INVOKESTATIC, Type.getInternalName(Integer.class), "valueOf",
                Type.getMethodDescriptor(Type.getType(Integer.class), Type.INT_TYPE), false);

        methodVisitor.visitInsn(Opcodes.AASTORE);
        methodVisitor.visitInsn(Opcodes.AASTORE);

        if (i < (tableColumns.length - 1)) {
            methodVisitor.visitInsn(Opcodes.DUP);
        }
    }

    methodVisitor.visitFieldInsn(Opcodes.PUTSTATIC,
            Type.getInternalName(BuildAutoUpgradeTestEntityModelImpl.class), "TABLE_COLUMNS",
            Type.getDescriptor(Object[][].class));
    methodVisitor.visitInsn(Opcodes.RETURN);
    methodVisitor.visitMaxs(0, 0);
    methodVisitor.visitEnd();
}

From source file:com.lighters.asm.HelloWorld.java

License:Apache License

public static void main(final String args[]) throws Exception {
    // Generates the bytecode corresponding to the following Java class:
    ////  www.  ja va  2s  .  c om
    // public class Example {
    // public static void main (String[] args) {
    // System.out.println("Hello world!");
    // }
    // }

    // creates a ClassWriter for the Example public class,
    // which inherits from Object
    ClassWriter cw = new ClassWriter(0);
    cw.visit(V1_1, ACC_PUBLIC, "Example", null, "java/lang/Object", null);

    // creates a MethodWriter for the (implicit) constructor
    MethodVisitor mw = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
    // pushes the 'this' variable
    mw.visitVarInsn(ALOAD, 0);
    // invokes the super class constructor
    mw.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
    mw.visitInsn(RETURN);
    // this code uses a maximum of one stack element and one local variable
    mw.visitMaxs(1, 1);
    mw.visitEnd();

    // creates a MethodWriter for the 'main' method
    mw = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "main", "([Ljava/lang/String;)V", null, null);
    // pushes the 'out' field (of type PrintStream) of the System class
    mw.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
    // pushes the "Hello World!" String constant
    mw.visitLdcInsn("Hello world!");
    // invokes the 'println' method (defined in the PrintStream class)
    mw.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V", false);
    mw.visitInsn(RETURN);
    // this code uses a maximum of two stack elements and two local
    // variables
    mw.visitMaxs(2, 2);
    mw.visitEnd();

    // gets the bytecode of the Example class, and loads it dynamically
    byte[] code = cw.toByteArray();

    FileOutputStream fos = new FileOutputStream("Example.class");
    fos.write(code);
    fos.close();

    HelloWorld loader = new HelloWorld();
    Class<?> exampleClass = loader.defineClass("Example", code, 0, code.length);

    // uses the dynamically generated class to print 'Helloworld'
    exampleClass.getMethods()[0].invoke(null, new Object[] { null });

    // ------------------------------------------------------------------------
    // Same example with a GeneratorAdapter (more convenient but slower)
    // ------------------------------------------------------------------------

    cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
    cw.visit(V1_1, ACC_PUBLIC, "Example", null, "java/lang/Object", null);

    // creates a GeneratorAdapter for the (implicit) constructor
    Method m = Method.getMethod("void <init> ()");
    GeneratorAdapter mg = new GeneratorAdapter(ACC_PUBLIC, m, null, null, cw);
    mg.loadThis();
    mg.invokeConstructor(Type.getType(Object.class), m);
    mg.returnValue();
    mg.endMethod();

    // creates a GeneratorAdapter for the 'main' method
    m = Method.getMethod("void main (String[])");
    mg = new GeneratorAdapter(ACC_PUBLIC + ACC_STATIC, m, null, null, cw);
    mg.getStatic(Type.getType(System.class), "out", Type.getType(PrintStream.class));
    mg.push("Hello world!");
    mg.invokeVirtual(Type.getType(PrintStream.class), Method.getMethod("void println (String)"));
    mg.returnValue();
    mg.endMethod();

    cw.visitEnd();

    code = cw.toByteArray();
    loader = new HelloWorld();
    exampleClass = loader.defineClass("Example", code, 0, code.length);

    // uses the dynamically generated class to print 'Helloworld'
    exampleClass.getMethods()[0].invoke(null, new Object[] { null });
}

From source file:com.lodgon.parboiled.transform.ActionClassGenerator.java

License:Apache License

@Override
protected void generateMethod(InstructionGroup group, ClassWriter cw) {
    MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "run", '(' + Types.CONTEXT_DESC + ")Z", null, null);

    insertSetContextCalls(group, 1);/*w w  w. j av  a 2s.c om*/
    convertXLoads(group);

    group.getInstructions().accept(mv);

    mv.visitInsn(IRETURN);
    mv.visitMaxs(0, 0); // trigger automatic computing
}

From source file:com.lodgon.parboiled.transform.GroupClassGenerator.java

License:Apache License

private void generateConstructor(ClassWriter cw) {
    MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "<init>", "(Ljava/lang/String;)V", null, null);
    mv.visitVarInsn(ALOAD, 0);/*w w  w  . ja v a  2s  .c  om*/
    mv.visitVarInsn(ALOAD, 1);
    mv.visitMethodInsn(INVOKESPECIAL, getBaseType().getInternalName(), "<init>", "(Ljava/lang/String;)V");
    mv.visitInsn(RETURN);
    mv.visitMaxs(0, 0); // trigger automatic computing
}