1 //===- GCStrategy.cpp - Garbage Collector Description ---------------------===//
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 // This file implements the policy object GCStrategy which describes the
10 // behavior of a given garbage collector.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "llvm/IR/GCStrategy.h"
15 #include "llvm/ADT/Twine.h"
16 
17 using namespace llvm;
18 
19 LLVM_INSTANTIATE_REGISTRY(GCRegistry)
20 
21 GCStrategy::GCStrategy() = default;
22 
23 std::unique_ptr<GCStrategy> llvm::getGCStrategy(const StringRef Name) {
24   for (auto &S : GCRegistry::entries())
25     if (S.getName() == Name)
26       return S.instantiate();
27 
28   if (GCRegistry::begin() == GCRegistry::end()) {
29     // In normal operation, the registry should not be empty.  There should
30     // be the builtin GCs if nothing else.  The most likely scenario here is
31     // that we got here without running the initializers used by the Registry
32     // itself and it's registration mechanism.
33     const std::string error =
34         std::string("unsupported GC: ") + Name.str() +
35         " (did you remember to link and initialize the library?)";
36     report_fatal_error(Twine(error));
37   } else
38     report_fatal_error(Twine(std::string("unsupported GC: ") + Name.str()));
39 }
40