llvm/tools/llvm-xray/xray-registry.cpp

   1 //===- xray-registry.cpp: Implement a command registry. -------------------===//
   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 #include "xray-registry.h"
  13
  14 #include <unordered_map>
  15
  16 namespace llvm {
  17 namespace xray {
  18
  19 using HandlerType = std::function<Error()>;
  20
  21 static std::unordered_map<cl::SubCommand *, HandlerType> &getCommands() {
  22   static std::unordered_map<cl::SubCommand *, HandlerType> Commands;
  23   return Commands;
  24 }
  25
  26 CommandRegistration::CommandRegistration(cl::SubCommand *SC,
  27                                          HandlerType Command) {
  28   assert(getCommands().count(SC) == 0 &&
  29          "Attempting to overwrite a command handler");
  30   assert(Command && "Attempting to register an empty std::function<Error()>");
  31   getCommands()[SC] = Command;
  32 }
  33
  34 HandlerType dispatch(cl::SubCommand *SC) {
  35   auto It = getCommands().find(SC);
  36   assert(It != getCommands().end() &&
  37          "Attempting to dispatch on un-registered SubCommand.");
  38   return It->second;
  39 }
  40
  41 } // namespace xray
  42 } // namespace llvm