1 //===- xray-registry.h - Define registry mechanism for commands. ----------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // Implement a simple subcommand registry.
10 //
11 //===----------------------------------------------------------------------===//
12 #ifndef TOOLS_LLVM_XRAY_XRAY_REGISTRY_H
13 #define TOOLS_LLVM_XRAY_XRAY_REGISTRY_H
14 
15 #include "llvm/Support/CommandLine.h"
16 #include "llvm/Support/Error.h"
17 
18 namespace llvm {
19 namespace xray {
20 
21 // Use |CommandRegistration| as a global initialiser that registers a function
22 // and associates it with |SC|. This requires that a command has not been
23 // registered to a given |SC|.
24 //
25 // Usage:
26 //
27 //   // At namespace scope.
28 //   static CommandRegistration Unused(&MySubCommand, [] { ... });
29 //
30 struct CommandRegistration {
31   CommandRegistration(cl::SubCommand *SC, std::function<Error()> Command);
32 };
33 
34 // Requires that |SC| is not null and has an associated function to it.
35 std::function<Error()> dispatch(cl::SubCommand *SC);
36 
37 } // namespace xray
38 } // namespace llvm
39 
40 #endif // TOOLS_LLVM_XRAY_XRAY_REGISTRY_H
41