Method parse_alias_region_decl

cranelift/reader/src/parser.rs:1943–1976

Parse an alias region decl alias-region-decl ::= * AliasRegion(region) "=" Integer String

(&mut self)

    //
    // alias-region-decl ::= * AliasRegion(region) "=" Integer String
    fn parse_alias_region_decl(&mut self) -> ParseResult<(ir::AliasRegion, ir::AliasRegionData)> {
        let ar_num = match self.token() {
            Some(Token::AliasRegion(n)) => n,
            _ => return err!(self.loc, "expected alias region number"),
        };
        self.consume();
        let ar = ir::AliasRegion::new(usize::try_from(ar_num).unwrap());

        self.match_token(Token::Equal, "expected '=' in alias region decl")?;

        let user_id = match self.token() {
            Some(Token::Integer(s)) => u32::from_str_radix(s, 10)
                .map_err(|_| self.error("expected integer user_id for alias region"))?,
            _ => return err!(self.loc, "expected integer user_id for alias region"),
        };
        self.consume();

        let description = match self.token() {
            Some(Token::String(s)) => s.to_owned(),
            _ => return err!(self.loc, "expected string description for alias region"),
        };
        self.consume();

        let data = ir::AliasRegionData {
            user_id,
            description: std::borrow::Cow::Owned(description),
        };

        // Collect any trailing comments.
        self.token();
        self.claim_gathered_comments(ir::AliasRegion::new(usize::try_from(ar_num).unwrap()));

        Ok((ar, data))
    }

    // Parse a stack limit decl
    //