ttvm 0.4.4

tt64 emulator API for Rust
Documentation 
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use super::ffi;
use mtk::result;

pub const MEMSTACK_LIMIT: usize = usize::MAX;

#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
pub struct MemStack {
    inner: Vec<Option<Vec<ffi::Byte>>>,
}

impl MemStack {
    pub fn new() -> Self {
        MemStack { inner: Vec::new() }
    }

    pub fn alloc(&mut self, size: usize) -> result::Result<ffi::Ref> {
        if self.inner.len() + 1 >= MEMSTACK_LIMIT {
            result::Error::quick(format!(
                "self.inner.len() ({}) + 1 >= MEMSTACK_LIMIT ({})",
                self.inner.len(),
                MEMSTACK_LIMIT
            ))
        } else {
            self.inner.push(Some(vec![0; size]));

            Ok((self.inner.len() - 1) as ffi::Ref)
        }
    }

    pub fn dealloc(&mut self, mem_ref: ffi::Ref) -> result::Result<usize> {
        match self.inner.get_mut(mem_ref as usize) {
            Some(some) => {
                let mem_raw = match some {
                    Some(some) => some,
                    None => {
                        return result::Error::quick(format!(
                            "memory {} is already deallocated",
                            mem_ref
                        ))
                    }
                };

                let len = mem_raw.len();

                *some = None;

                Ok(len)
            }
            None => result::Error::quick(format!("can not access to memory {}", mem_ref)),
        }
    }

    pub fn get(&self, mem_ref: ffi::Ref) -> result::Result<&Vec<ffi::Byte>> {
        match self.inner.get(mem_ref as usize) {
            Some(some) => match some {
                Some(some) => Ok(some),
                None => result::Error::quick(format!("can not access to {}", mem_ref)),
            },
            None => result::Error::quick(format!("can not access to memory {}", mem_ref)),
        }
    }

    pub fn get_mut(&mut self, mem_ref: ffi::Ref) -> result::Result<&mut Vec<ffi::Byte>> {
        match self.inner.get_mut(mem_ref as usize) {
            Some(some) => match some {
                Some(some) => Ok(some),
                None => result::Error::quick(format!("can not access to {}", mem_ref)),
            },
            None => result::Error::quick(format!("can not access to memory {}", mem_ref)),
        }
    }
}

#[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
pub struct ByteStack {
    inner: Vec<ffi::Byte>,
}

impl ByteStack {
    pub fn new() -> Self {
        ByteStack { inner: Vec::new() }
    }

    pub fn push(&mut self, byte: ffi::Byte) {
        self.inner.push(byte)
    }

    pub fn pop(&mut self) -> Option<ffi::Byte> {
        self.inner.pop()
    }
}