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