Function gen_constructor

cranelift/codegen/meta/src/gen_settings.rs:17–51

Emits the constructor of the Flags structure.

(group: &SettingGroup, parent: ParentGroup, fmt: &mut Formatter)

/// Emits the constructor of the Flags structure.
fn gen_constructor(group: &SettingGroup, parent: ParentGroup, fmt: &mut Formatter) {
    let args = match parent {
        ParentGroup::None => "builder: Builder",
        ParentGroup::Shared => "shared: &settings::Flags, builder: &Builder",
    };
    fmt.add_block("impl Flags", |fmt| {
        fmt.doc_comment(format!("Create flags {} settings group.", group.name));
        fmtln!(
            fmt,
            "#[allow(unused_variables, reason = \"generated code\")]"
        );
        fmt.add_block(&format!("pub fn new({args}) -> Self"), |fmt| {
            fmtln!(fmt, "let bvec = builder.state_for(\"{}\");", group.name);
            fmtln!(
                fmt,
                "let mut {} = Self {{ bytes: [0; {}] }};",
                group.name,
                group.byte_size()
            );
            fmtln!(
                fmt,
                "debug_assert_eq!(bvec.len(), {});",
                group.settings_size
            );
            fmtln!(
                fmt,
                "{}.bytes[0..{}].copy_from_slice(&bvec);",
                group.name,
                group.settings_size
            );

            fmtln!(fmt, "{}", group.name);
        });
    });
}

/// Generates the `iter` function.
fn gen_iterator(group: &SettingGroup, fmt: &mut Formatter) {