51 lines
2.1 KiB
C++
51 lines
2.1 KiB
C++
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//===- GCStrategy.cpp - Garbage Collector Description ---------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the policy object GCStrategy which describes the
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// behavior of a given garbage collector.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/GCStrategy.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/IR/BuiltinGCs.h"
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using namespace llvm;
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LLVM_INSTANTIATE_REGISTRY(GCRegistry)
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GCStrategy::GCStrategy() = default;
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std::unique_ptr<GCStrategy> llvm::getGCStrategy(const StringRef Name) {
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for (auto &S : GCRegistry::entries())
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if (S.getName() == Name)
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return S.instantiate();
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// We need to link all the builtin GCs when LLVM is used as a static library.
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// The linker will quite happily remove the static constructors that register
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// the builtin GCs if we don't use a function from that object. This function
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// does nothing but we need to make sure it is (or at least could be, even
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// with all optimisations enabled) called *somewhere*, and this is a good
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// place to do that: if the GC strategies are being used then this function
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// obviously can't be removed by the linker, and here it won't affect
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// performance, since there's about to be a fatal error anyway.
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llvm::linkAllBuiltinGCs();
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if (GCRegistry::begin() == GCRegistry::end()) {
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// In normal operation, the registry should not be empty. There should
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// be the builtin GCs if nothing else. The most likely scenario here is
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// that we got here without running the initializers used by the Registry
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// itself and it's registration mechanism.
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const std::string error =
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std::string("unsupported GC: ") + Name.str() +
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" (did you remember to link and initialize the library?)";
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report_fatal_error(Twine(error));
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} else
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report_fatal_error(Twine(std::string("unsupported GC: ") + Name.str()));
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}
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