llvm/lib/IR/GCStrategy.cpp

   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
  16 using namespace llvm;
  17
  18 LLVM_INSTANTIATE_REGISTRY(GCRegistry)
  19
  20 GCStrategy::GCStrategy() = default;
  21
  22 std::unique_ptr<GCStrategy> llvm::getGCStrategy(const StringRef Name) {
  23   for (auto &S : GCRegistry::entries())
  24     if (S.getName() == Name)
  25       return S.instantiate();
  26
  27   if (GCRegistry::begin() == GCRegistry::end()) {
  28     // In normal operation, the registry should not be empty.  There should
  29     // be the builtin GCs if nothing else.  The most likely scenario here is
  30     // that we got here without running the initializers used by the Registry
  31     // itself and it's registration mechanism.
  32     const std::string error =
  33         std::string("unsupported GC: ") + Name.str() +
  34         " (did you remember to link and initialize the library?)";
  35     report_fatal_error(error);
  36   } else
  37     report_fatal_error(std::string("unsupported GC: ") + Name.str());
  38 }