xray-registry.cpp revision 360660 
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 "llvm/Support/ManagedStatic.h"
15#include <unordered_map>
16
17namespace llvm {
18namespace xray {
19
20using HandlerType = std::function<Error()>;
21
22ManagedStatic<std::unordered_map<cl::SubCommand *, HandlerType>> Commands;
23
24CommandRegistration::CommandRegistration(cl::SubCommand *SC,
25                                         HandlerType Command) {
26  assert(Commands->count(SC) == 0 &&
27         "Attempting to overwrite a command handler");
28  assert(Command && "Attempting to register an empty std::function<Error()>");
29  (*Commands)[SC] = Command;
30}
31
32HandlerType dispatch(cl::SubCommand *SC) {
33  auto It = Commands->find(SC);
34  assert(It != Commands->end() &&
35         "Attempting to dispatch on un-registered SubCommand.");
36  return It->second;
37}
38
39} // namespace xray
40} // namespace llvm
41