tools/llvm-xray/xray-registry.h

   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