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 | |