Method parse_target_specs

cranelift/reader/src/parser.rs:1086–1176

Parse a list of target specs. Accept a mix of `target` and `set` command lines. The `set` commands are cumulative.

(&mut self, options: &ParseOptions)

    /// Accept a mix of `target` and `set` command lines. The `set` commands are cumulative.
    ///
    fn parse_target_specs(&mut self, options: &ParseOptions) -> ParseResult<isaspec::IsaSpec> {
        // Were there any `target` commands?
        let mut seen_target = false;
        // Location of last `set` command since the last `target`.
        let mut last_set_loc = None;

        let mut targets = Vec::new();
        let mut flag_builder = settings::builder();

        let bool_to_str = |val: bool| {
            if val { "true" } else { "false" }
        };

        // default to enabling cfg info
        flag_builder
            .set(
                "machine_code_cfg_info",
                bool_to_str(options.machine_code_cfg_info),
            )
            .expect("machine_code_cfg_info option should be present");

        flag_builder
            .set("unwind_info", bool_to_str(options.unwind_info))
            .expect("unwind_info option should be present");

        while let Some(Token::Identifier(command)) = self.token() {
            match command {
                "set" => {
                    last_set_loc = Some(self.loc);
                    isaspec::parse_options(
                        self.consume_line().trim().split_whitespace(),
                        &mut flag_builder,
                        self.loc,
                    )
                    .map_err(|err| ParseError::from(err))?;
                }
                "target" => {
                    let loc = self.loc;
                    // Grab the whole line so the lexer won't go looking for tokens on the
                    // following lines.
                    let mut words = self.consume_line().trim().split_whitespace().peekable();
                    // Look for `target foo`.
                    let target_name = match words.next() {
                        Some(w) => w,
                        None => return err!(loc, "expected target triple"),
                    };
                    let triple = match Triple::from_str(target_name) {
                        Ok(triple) => triple,
                        Err(err) => return err!(loc, err),
                    };
                    let mut isa_builder = match isa::lookup(triple) {
                        Err(isa::LookupError::SupportDisabled) => {
                            continue;
                        }
                        Err(isa::LookupError::Unsupported) => {
                            return warn!(loc, "unsupported target '{}'", target_name);
                        }
                        Ok(b) => b,