compilers AST -> RISC-V

Program p = new Program(Arrays.asList(
    new Declaration("test", 0,
        new Invoke("factorial", Arrays.asList(
            new IntLiteral(9)
        ))
    ),
    new Declaration("factorial", 1,
        new If(
            new Variable(1),
            new Greater(),
            new IntLiteral(1),
            new Binexp(new Variable(1),
                new Times(),
                new Invoke("factorial", Arrays.asList(
                    new Binexp(new Variable(1),
                        new Minus(),
                        new IntLiteral(1)
                    )
                ))
            ), new IntLiteral(1)
        )
    )
));

/*
OUTPUT:

    .text
    .align 2
    .globl test_entry
test_entry:
    mv s0 sp
    sw ra 0(sp)
    addi sp sp -4
    sw s0 0(sp)
    addi sp sp -4
    li a0 9
    sw a0 0(sp)
    addi sp sp -4
    jal factorial_entry
    lw ra 4(sp)
    addi sp sp 8
    lw s0 0(sp)
    li a7 10
    ecall
factorial_entry:
    mv s0 sp
    sw ra 0(sp)
    addi sp sp -4
    lw a0 4(s0)
    sw a0 0(sp)
    addi sp sp -4
    li a0 1
    lw t1 4(sp)
    addi sp sp 4
    blt a0 t1 then_0
else_0:
    li a0 1
    b exit_0
then_0:
    lw a0 4(s0)
    sw a0 0(sp)
    addi sp sp -4
    sw s0 0(sp)
    addi sp sp -4
    lw a0 4(s0)
    sw a0 0(sp)
    addi sp sp -4
    li a0 1
    lw t1 4(sp)
    sub a0 t1 a0
    addi sp sp 4
    sw a0 0(sp)
    addi sp sp -4
    jal factorial_entry
    lw t1 4(sp)
    mul a0 t1 a0
    addi sp sp 4
exit_0:
    lw ra 4(sp)
    addi sp sp 12
    lw s0 0(sp)
    jr ra
*/