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mrustc (master)
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#[derive(Copy, Clone)] pub enum Instruction { I32Const(i32), I32Add, Br(usize), BrEqz(usize), Ret, } pub type ControlFlow = core::ops::ControlFlow<BreakTarget, ()>; #[derive(Copy, Clone)] pub enum BreakTarget { Goto(usize), Ret, } pub struct Context<'func, 'engine> { pc: usize, insts: &'func [Instruction], stack: &'engine mut Vec<i32>, } impl<'func, 'engine> Context<'func, 'engine> { #[no_mangle] fn execute_until_done(&mut self) -> Result<(), Error> { 'outer: loop { let next_inst = self.insts[self.pc]; match self.execute_instruction(next_inst)? { ControlFlow::Continue(()) => { self.pc += 1; } ControlFlow::Break(BreakTarget::Goto(new_pc)) => { self.pc = new_pc; } ControlFlow::Break(BreakTarget::Ret) => { break 'outer } } } Ok(()) } #[inline(always)] fn execute_instruction(&mut self, inst: Instruction) -> Result<ControlFlow, Error> { match inst { Instruction::I32Const(value) => { let sp = self.stack.len(); self.stack.get_mut(sp - 1) .map(|cell| *cell = value) .ok_or(Error::BugInInterpreter)?; Ok(ControlFlow::Continue(())) } Instruction::I32Add => { let rhs = self.stack.pop().ok_or(Error::BugInInterpreter)?; let lhs = self.stack.pop().ok_or(Error::BugInInterpreter)?; let result = lhs.wrapping_add(rhs); let sp = self.stack.len(); self.stack.get_mut(sp - 1) .map(|cell| *cell = result) .ok_or(Error::BugInInterpreter)?; Ok(ControlFlow::Continue(())) } Instruction::Br(target) => { Ok(ControlFlow::Break(BreakTarget::Goto(target))) } Instruction::BrEqz(target) => { let value = self.stack.pop().ok_or(Error::BugInInterpreter)?; let targets = [self.pc + 1, target]; let new_pc = targets[(value == 0) as usize]; Ok(ControlFlow::Break(BreakTarget::Goto(new_pc))) } Instruction::Ret => { Ok(ControlFlow::Break(BreakTarget::Ret)) } } } } pub struct Function { insts: Vec<Instruction>, } #[derive(Debug)] pub enum Error { BugInInterpreter, } pub struct Interpreter { stack: Vec<i32>, } impl Default for Interpreter { fn default() -> Self { Self { stack: vec![0x00; 1024] } } } impl Interpreter { fn execute(&mut self, func: &Function) -> Result<(), Error> { Context { pc: 0, insts: &func.insts[..], stack: &mut self.stack, }.execute_until_done() } } #[no_mangle] fn execute_program() { let mut engine = Interpreter::default(); let func = Function { insts: vec![ Instruction::I32Const(1), Instruction::I32Const(2), Instruction::I32Add, Instruction::Ret, ], }; engine.execute(&func).unwrap(); }
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