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

   1 //===- xray-registry.cpp: Implement a command registry. -------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // Implement a simple subcommand registry.
  11 //
  12 //===----------------------------------------------------------------------===//
  13 #include "xray-registry.h"
  14
  15 #include "llvm/Support/ManagedStatic.h"
  16 #include <unordered_map>
  17
  18 namespace llvm {
  19 namespace xray {
  20
  21 using HandlerType = std::function<Error()>;
  22
  23 ManagedStatic<std::unordered_map<cl::SubCommand *, HandlerType>> Commands;
  24
  25 CommandRegistration::CommandRegistration(cl::SubCommand *SC,
  26                                          HandlerType Command) {
  27   assert(Commands->count(SC) == 0 &&
  28          "Attempting to overwrite a command handler");
  29   assert(Command && "Attempting to register an empty std::function<Error()>");
  30   (*Commands)[SC] = Command;
  31 }
  32
  33 HandlerType dispatch(cl::SubCommand *SC) {
  34   auto It = Commands->find(SC);
  35   assert(It != Commands->end() &&
  36          "Attempting to dispatch on un-registered SubCommand.");
  37   return It->second;
  38 }
  39
  40 } // namespace xray
  41 } // namespace llvm