rune 0.9.0

An embeddable dynamic programming language for Rust.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31

use crate::compiling::v1::assemble::prelude::*;

/// Compile a try expression.
impl Assemble for ast::ExprTry {
    fn assemble(&self, c: &mut Compiler<'_>, needs: Needs) -> CompileResult<Asm> {
        let span = self.span();
        log::trace!("ExprTry => {:?}", c.source.source(span));

        let not_error = c.asm.new_label("try_not_error");

        self.expr.assemble(c, Needs::Value)?.apply(c)?;
        c.asm.push(Inst::Dup, span);
        c.asm.push(Inst::IsValue, span);
        c.asm.jump_if(not_error, span);

        // Clean up all locals so far and return from the current function.
        let total_var_count = c.scopes.total_var_count(span)?;
        c.locals_clean(total_var_count, span);
        c.asm.push(Inst::Return, span);

        c.asm.label(not_error)?;

        if needs.value() {
            c.asm.push(Inst::Unwrap, span);
        } else {
            c.asm.push(Inst::Pop, span);
        }

        Ok(Asm::top(span))
    }
}