Function panicExtra [src]

Equivalent to @panic but with a formatted message, and with an explicitly provided return address.

Prototype

pub fn panicExtra( ret_addr: ?usize, comptime format: []const u8, args: anytype, ) noreturn

Parameters

ret_addr: ?usizeformat: []const u8

Source

  pub fn panicExtra(
    ret_addr: ?usize,
    comptime format: []const u8,
    args: anytype,
) noreturn {
    @branchHint(.cold);

    const size = 0x1000;
    const trunc_msg = "(msg truncated)";
    var buf: [size + trunc_msg.len]u8 = undefined;
    var bw: Writer = .fixed(buf[0..size]);
    // a minor annoyance with this is that it will result in the NoSpaceLeft
    // error being part of the @panic stack trace (but that error should
    // only happen rarely)
    const msg = if (bw.print(format, args)) |_| bw.buffered() else |_| blk: {
        @memcpy(buf[size..], trunc_msg);
        break :blk &buf;
    };
    std.builtin.panic.call(msg, ret_addr);
}  