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use crate::instructions::{Execute, Instruction, Operand};
#[derive(Debug, Default)]
/// Self-contained type for the creation and processing of instructions.
pub struct Assembler {
instructions: Vec<Instruction>,
}
impl Assembler {
#[must_use]
/// Constructs a new [`Assembler`].
///
/// # Example
/// ```
/// use vm::assembler::Assembler;
///
/// let assembler = Assembler::new();
/// ```
pub fn new() -> Self {
Assembler::default()
}
#[must_use]
/// Consumes [`self`](Assembler) pushing a new [`Call`](Instruction::Call) into self.
///
/// # Example
/// ```
/// use vm::assembler::Assembler;
/// use vm::instructions::Operand;
///
/// let assembler = Assembler::new().call(Operand::Value(0));
/// ```
pub fn call(mut self, index: Operand) -> Self {
self.instructions.push(Instruction::Call(index));
self
}
#[must_use]
/// Consumes [`self`](Assembler) pushing a new [`Mov`](Instruction::Mov) into self.
///
/// # Example
/// ```
/// use vm::assembler::Assembler;
/// use vm::instructions::Operand;
/// use vm::register::Width;
///
/// let assembler = Assembler::new().mov(Operand::Value(0), Operand::Register(Width::QWord(0)));
/// ```
pub fn mov(mut self, source: Operand, destination: Operand) -> Self {
self.instructions
.push(Instruction::Mov(source, destination));
self
}
#[must_use]
/// Consumes [`self`](Assembler) pushing a new [`Jmp`](Instruction::Jmp) into self.
///
/// # Example
/// ```
/// use vm::assembler::Assembler;
/// use vm::instructions::Operand;
///
/// let assembler = Assembler::new().jmp(Operand::Value(0));
/// ```
pub fn jmp(mut self, source: Operand) -> Self {
self.instructions.push(Instruction::Jmp(source));
self
}
#[must_use]
/// Consumes [`self`](Assembler) pushing a new [`Jnz`](Instruction::Jnz) into self.
///
/// # Example
/// ```
/// use vm::assembler::Assembler;
/// use vm::instructions::Operand;
///
/// let assembler = Assembler::new().jnz(Operand::Value(0));
/// ```
pub fn jnz(mut self, source: Operand) -> Self {
self.instructions.push(Instruction::Jnz(source));
self
}
#[must_use]
/// Consumes [`self`](Assembler) pushing a new [`Jz`](Instruction::Jz) into self.
///
/// # Example
/// ```
/// use vm::assembler::Assembler;
/// use vm::instructions::Operand;
///
/// let assembler = Assembler::new().jz(Operand::Value(0));
/// ```
pub fn jz(mut self, source: Operand) -> Self {
self.instructions.push(Instruction::Jz(source));
self
}
#[must_use]
/// Consumes [`self`](Assembler) pushing a new [`Cmp`](Instruction::Cmp) into self.
///
/// # Example
/// ```
/// use vm::assembler::Assembler;
/// use vm::instructions::Operand;
/// use vm::register::Width;
///
/// let assembler = Assembler::new().cmp(Operand::Value(0), Operand::Register(Width::QWord(0)));
/// ```
pub fn cmp(mut self, source: Operand, destination: Operand) -> Self {
self.instructions
.push(Instruction::Cmp(source, destination));
self
}
#[must_use]
/// Consumes [`self`](Assembler) pushing a new [`Add`](Instruction::Add) into self.
///
/// # Example
/// ```
/// use vm::assembler::Assembler;
/// use vm::instructions::Operand;
/// use vm::register::Width;
///
/// let assembler = Assembler::new().add(
/// Operand::Value(0),
/// Operand::Register(Width::QWord(0)),
/// Operand::Register(Width::QWord(0))
/// );
/// ```
pub fn add(mut self, value: Operand, source: Operand, destination: Operand) -> Self {
self.instructions
.push(Instruction::Add(value, source, destination));
self
}
#[must_use]
/// Consumes [`self`](Assembler) pushing a new [`Sub`](Instruction::Sub) into self.
///
/// # Example
/// ```
/// use vm::assembler::Assembler;
/// use vm::instructions::Operand;
/// use vm::register::Width;
///
/// let assembler = Assembler::new().sub(
/// Operand::Value(0),
/// Operand::Register(Width::QWord(0)),
/// Operand::Register(Width::QWord(0))
/// );
/// ```
pub fn sub(mut self, value: Operand, source: Operand, destination: Operand) -> Self {
self.instructions
.push(Instruction::Sub(value, source, destination));
self
}
#[must_use]
/// Consumes [`self`](Assembler) pushing a new [`Jg`](Instruction::Jg) into self.
///
/// # Example
/// ```
/// use vm::assembler::Assembler;
/// use vm::instructions::Operand;
///
/// let assembler = Assembler::new().jg(Operand::Value(0));
/// ```
pub fn jg(mut self, source: Operand) -> Self {
self.instructions.push(Instruction::Jg(source));
self
}
#[must_use]
/// Consumes [`self`](Assembler) pushing a new [`Jl`](Instruction::Jl) into self.
///
/// # Example
/// ```
/// use vm::assembler::Assembler;
/// use vm::instructions::Operand;
///
/// let assembler = Assembler::new().jl(Operand::Value(0));
/// ```
pub fn jl(mut self, source: Operand) -> Self {
self.instructions.push(Instruction::Jl(source));
self
}
#[must_use]
/// Consumes [`self`](Assembler) pushing a new [`Jng`](Instruction::Jng) into self.
///
/// # Example
/// ```
/// use vm::assembler::Assembler;
/// use vm::instructions::Operand;
///
/// let assembler = Assembler::new().jng(Operand::Value(0));
/// ```
pub fn jng(mut self, source: Operand) -> Self {
self.instructions.push(Instruction::Jng(source));
self
}
#[must_use]
/// Consumes [`self`](Assembler) pushing a new [`Jnl`](Instruction::Jnl) into self.
///
/// # Example
/// ```
/// use vm::assembler::Assembler;
/// use vm::instructions::Operand;
///
/// let assembler = Assembler::new().jnl(Operand::Value(0));
/// ```
pub fn jnl(mut self, source: Operand) -> Self {
self.instructions.push(Instruction::Jnl(source));
self
}
#[must_use]
/// Returns a list of [`Execute`] traits derived from self's instruction list.
///
/// # Example
/// ```
/// use vm::assembler::Assembler;
/// use vm::instructions::Operand;
/// use vm::register::Width;
///
/// let instructions = Assembler::new()
/// .add(
/// Operand::Value(0),
/// Operand::Register(Width::QWord(0)),
/// Operand::Register(Width::QWord(0)),
/// )
/// .compile();
///```
pub fn compile(self) -> Vec<Box<dyn Execute>> {
self.instructions
.into_iter()
.map(|instruction| instruction.executable())
.collect()
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::register::Width;
#[test]
fn test_new_assembler() {
let assembler = Assembler::new();
assert_eq!(assembler.instructions.len(), 0);
}
#[test]
fn test_call() {
let assembler = Assembler::new().call(Operand::Value(0));
assert_eq!(assembler.instructions.len(), 1);
}
#[test]
fn test_mov() {
let assembler = Assembler::new().mov(Operand::Value(0), Operand::Register(Width::QWord(0)));
assert_eq!(assembler.instructions.len(), 1);
}
#[test]
fn test_jmp() {
let assembler = Assembler::new().jmp(Operand::Value(0));
assert_eq!(assembler.instructions.len(), 1);
}
#[test]
fn test_jnz() {
let assembler = Assembler::new().jnz(Operand::Value(0));
assert_eq!(assembler.instructions.len(), 1);
}
#[test]
fn test_jz() {
let assembler = Assembler::new().jz(Operand::Value(0));
assert_eq!(assembler.instructions.len(), 1);
}
#[test]
fn test_cmp() {
let assembler = Assembler::new().cmp(Operand::Value(0), Operand::Register(Width::QWord(0)));
assert_eq!(assembler.instructions.len(), 1);
}
#[test]
fn test_add() {
let assembler = Assembler::new().add(
Operand::Value(0),
Operand::Register(Width::QWord(0)),
Operand::Register(Width::QWord(0)),
);
assert_eq!(assembler.instructions.len(), 1);
}
#[test]
fn test_compile() {
let assembler = Assembler::new().add(
Operand::Value(0),
Operand::Register(Width::QWord(0)),
Operand::Register(Width::QWord(0)),
);
let instructions = assembler.compile();
assert_eq!(instructions.len(), 1);
}
}