LLVM 17.0.0git
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1//===- GCStrategy.cpp - Garbage Collector Description ---------------------===//
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
9// This file implements the policy object GCStrategy which describes the
10// behavior of a given garbage collector.
14#include "llvm/IR/GCStrategy.h"
15#include "llvm/ADT/Twine.h"
16#include "llvm/IR/BuiltinGCs.h"
18using namespace llvm;
22GCStrategy::GCStrategy() = default;
24std::unique_ptr<GCStrategy> llvm::getGCStrategy(const StringRef Name) {
25 for (auto &S : GCRegistry::entries())
26 if (S.getName() == Name)
27 return S.instantiate();
29 // We need to link all the builtin GCs when LLVM is used as a static library.
30 // The linker will quite happily remove the static constructors that register
31 // the builtin GCs if we don't use a function from that object. This function
32 // does nothing but we need to make sure it is (or at least could be, even
33 // with all optimisations enabled) called *somewhere*, and this is a good
34 // place to do that: if the GC strategies are being used then this function
35 // obviously can't be removed by the linker, and here it won't affect
36 // performance, since there's about to be a fatal error anyway.
40 // In normal operation, the registry should not be empty. There should
41 // be the builtin GCs if nothing else. The most likely scenario here is
42 // that we got here without running the initializers used by the Registry
43 // itself and it's registration mechanism.
44 const std::string error =
45 std::string("unsupported GC: ") + Name.str() +
46 " (did you remember to link and initialize the library?)";
48 } else
49 report_fatal_error(Twine(std::string("unsupported GC: ") + Name.str()));
std::string Name
Instantiate a registry class.
Definition: Registry.h:137
#define error(X)
A global registry used in conjunction with static constructors to make pluggable components (like tar...
Definition: Registry.h:44
static iterator end()
Definition: Registry.h:99
static iterator_range< iterator > entries()
Definition: Registry.h:101
static iterator begin()
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:50
Twine - A lightweight data structure for efficiently representing the concatenation of temporary valu...
Definition: Twine.h:81
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
void report_fatal_error(Error Err, bool gen_crash_diag=true)
Report a serious error, calling any installed error handler.
Definition: Error.cpp:145
void linkAllBuiltinGCs()
FIXME: Collector instances are not useful on their own.
Definition: BuiltinGCs.cpp:132
std::unique_ptr< GCStrategy > getGCStrategy(const StringRef Name)
Lookup the GCStrategy object associated with the given gc name.
Definition: GCStrategy.cpp:24