init

pub fn init(builder: *Builder, options: struct {
    function: Function.Index,
    strip: bool,
}) Allocator.Error!WipFunction {
    var self: WipFunction = .{
        .builder = builder,
        .function = options.function,
        .prev_debug_location = .no_location,
        .debug_location = .no_location,
        .cursor = undefined,
        .blocks = .{},
        .instructions = .{},
        .names = .{},
        .strip = options.strip,
        .debug_locations = .{},
        .debug_values = .{},
        .extra = .{},
    };
    errdefer self.deinit();

    const params_len = options.function.typeOf(self.builder).functionParameters(self.builder).len;
    try self.ensureUnusedExtraCapacity(params_len, NoExtra, 0);
    try self.instructions.ensureUnusedCapacity(self.builder.gpa, params_len);
    if (!self.strip) {
        try self.names.ensureUnusedCapacity(self.builder.gpa, params_len);
    }
    for (0..params_len) |param_index| {
        self.instructions.appendAssumeCapacity(.{ .tag = .arg, .data = @intCast(param_index) });
        if (!self.strip) {
            self.names.appendAssumeCapacity(.empty); // TODO: param names
        }
    }

    return self;
}