Function write_block_header

cranelift/codegen/src/write.rs:221–250

Write out the basic block header, outdented: block1: block1(v1: i32): block10(v4: f64, v5: i8):

(
    w: &mut dyn Write,
    func: &Function,
    block: Block,
    indent: usize,
)

///    block10(v4: f64, v5: i8):
///
pub fn write_block_header(
    w: &mut dyn Write,
    func: &Function,
    block: Block,
    indent: usize,
) -> fmt::Result {
    let cold = if func.layout.is_cold(block) {
        " cold"
    } else {
        ""
    };

    // The `indent` is the instruction indentation. block headers are 4 spaces out from that.
    write!(w, "{1:0$}{2}", indent - 4, "", block)?;

    let mut args = func.dfg.block_params(block).iter().cloned();
    match args.next() {
        None => return writeln!(w, "{cold}:"),
        Some(arg) => {
            write!(w, "(")?;
            write_arg(w, func, arg)?;
        }
    }
    // Remaining arguments.
    for arg in args {
        write!(w, ", ")?;
        write_arg(w, func, arg)?;
    }
    writeln!(w, "){cold}:")
}

fn decorate_block<FW: FuncWriter>(
    func_w: &mut FW,