pub const Index = enum(u32) {
    none = std.math.maxInt(u32),
    _,

    pub fn ptr(self: Index, builder: *Builder) *Function {
        return &builder.functions.items[@intFromEnum(self)];
    }

    pub fn ptrConst(self: Index, builder: *const Builder) *const Function {
        return &builder.functions.items[@intFromEnum(self)];
    }

    pub fn name(self: Index, builder: *const Builder) StrtabString {
        return self.ptrConst(builder).global.name(builder);
    }

    pub fn rename(self: Index, new_name: StrtabString, builder: *Builder) Allocator.Error!void {
        return self.ptrConst(builder).global.rename(new_name, builder);
    }

    pub fn typeOf(self: Index, builder: *const Builder) Type {
        return self.ptrConst(builder).global.typeOf(builder);
    }

    pub fn toConst(self: Index, builder: *const Builder) Constant {
        return self.ptrConst(builder).global.toConst();
    }

    pub fn toValue(self: Index, builder: *const Builder) Value {
        return self.toConst(builder).toValue();
    }

    pub fn setLinkage(self: Index, linkage: Linkage, builder: *Builder) void {
        return self.ptrConst(builder).global.setLinkage(linkage, builder);
    }

    pub fn setUnnamedAddr(self: Index, unnamed_addr: UnnamedAddr, builder: *Builder) void {
        return self.ptrConst(builder).global.setUnnamedAddr(unnamed_addr, builder);
    }

    pub fn setCallConv(self: Index, call_conv: CallConv, builder: *Builder) void {
        self.ptr(builder).call_conv = call_conv;
    }

    pub fn setAttributes(
        self: Index,
        new_function_attributes: FunctionAttributes,
        builder: *Builder,
    ) void {
        self.ptr(builder).attributes = new_function_attributes;
    }

    pub fn setSection(self: Index, section: String, builder: *Builder) void {
        self.ptr(builder).section = section;
    }

    pub fn setAlignment(self: Index, alignment: Alignment, builder: *Builder) void {
        self.ptr(builder).alignment = alignment;
    }

    pub fn setSubprogram(self: Index, subprogram: Metadata, builder: *Builder) void {
        self.ptrConst(builder).global.setDebugMetadata(subprogram, builder);
    }
}