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In the textual format, `noduplicates` means no COMDAT/section group deduplication is performed. Therefore, if both sets of sections are retained, and they happen to define strong external symbols with the same names, there will be a duplicate definition linker error. In PE/COFF, the selection kind lowers to `IMAGE_COMDAT_SELECT_NODUPLICATES`. The name describes the corollary instead of the immediate semantics. The name can cause confusion to other binary formats (ELF, wasm) which have implemented/ want to implement the "no deduplication" selection kind. Rename it to be clearer. Reviewed By: rnk Differential Revision: https://reviews.llvm.org/D106319
71 lines
2.2 KiB
C++
71 lines
2.2 KiB
C++
//===- llvm/IR/Comdat.h - Comdat definitions --------------------*- C++ -*-===//
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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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/// @file
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/// This file contains the declaration of the Comdat class, which represents a
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/// single COMDAT in LLVM.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_IR_COMDAT_H
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#define LLVM_IR_COMDAT_H
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#include "llvm-c/Types.h"
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#include "llvm/Support/CBindingWrapping.h"
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namespace llvm {
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class raw_ostream;
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class StringRef;
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template <typename ValueTy> class StringMapEntry;
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// This is a Name X SelectionKind pair. The reason for having this be an
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// independent object instead of just adding the name and the SelectionKind
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// to a GlobalObject is that it is invalid to have two Comdats with the same
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// name but different SelectionKind. This structure makes that unrepresentable.
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class Comdat {
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public:
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enum SelectionKind {
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Any, ///< The linker may choose any COMDAT.
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ExactMatch, ///< The data referenced by the COMDAT must be the same.
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Largest, ///< The linker will choose the largest COMDAT.
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NoDeduplicate, ///< No deduplication is performed.
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SameSize, ///< The data referenced by the COMDAT must be the same size.
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};
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Comdat(const Comdat &) = delete;
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Comdat(Comdat &&C);
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SelectionKind getSelectionKind() const { return SK; }
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void setSelectionKind(SelectionKind Val) { SK = Val; }
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StringRef getName() const;
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void print(raw_ostream &OS, bool IsForDebug = false) const;
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void dump() const;
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private:
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friend class Module;
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Comdat();
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// Points to the map in Module.
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StringMapEntry<Comdat> *Name = nullptr;
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SelectionKind SK = Any;
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};
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// Create wrappers for C Binding types (see CBindingWrapping.h).
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DEFINE_SIMPLE_CONVERSION_FUNCTIONS(Comdat, LLVMComdatRef)
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inline raw_ostream &operator<<(raw_ostream &OS, const Comdat &C) {
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C.print(OS);
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return OS;
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}
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} // end namespace llvm
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#endif // LLVM_IR_COMDAT_H
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