printLineInfo

fn printLineInfo(
    io: Io,
    t: Io.Terminal,
    debug_info: *SelfInfo,
    address: usize,
    symbol: Symbol,
) Writer.Error!void

File

Code

fn printLineInfo(
    io: Io,
    t: Io.Terminal,
    debug_info: *SelfInfo,
    address: usize,
    symbol: Symbol,
) Writer.Error!void {
    const writer = t.writer;
    t.setColor(.bold) catch {};

    if (symbol.source_location) |*sl| {
        if (sl.column == 0) {
            try writer.print("{s}:{d}", .{ sl.file_name, sl.line });
        } else {
            try writer.print("{s}:{d}:{d}", .{ sl.file_name, sl.line, sl.column });
        }
    } else {
        try writer.writeAll("???:?:?");
    }

    t.setColor(.reset) catch {};
    try writer.writeAll(": ");
    t.setColor(.dim) catch {};
    try writer.print("0x{x} in {s} ({s})", .{
        address,
        symbol.name orelse "???",
        symbol.compile_unit_name orelse debug_info.getModuleName(io, address) catch "???",
    });
    t.setColor(.reset) catch {};
    try writer.writeAll("\n");

    // Show the matching source code line if possible
    if (symbol.source_location) |sl| {
        if (printLineFromFile(io, writer, sl)) {
            if (sl.column > 0) {
                // The caret already takes one char
                const space_needed = @as(usize, @intCast(sl.column - 1));

                try writer.splatByteAll(' ', space_needed);
                t.setColor(.green) catch {};
                try writer.writeAll("^");
                t.setColor(.reset) catch {};
            }
            try writer.writeAll("\n");
        } else |_| {
            // Ignore all errors; it's a better UX to just print the source location without the
            // corresponding line number. The user can always open the source file themselves.
        }
    }
}