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This new IR facility allows us to represent the object-file semantic of a COMDAT group. COMDATs allow us to tie together sections and make the inclusion of one dependent on another. This is required to implement features like MS ABI VFTables and optimizing away certain kinds of initialization in C++. This functionality is only representable in COFF and ELF, Mach-O has no similar mechanism. Differential Revision: http://reviews.llvm.org/D4178 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211920 91177308-0d34-0410-b5e6-96231b3b80d8
67 lines
2.0 KiB
C++
67 lines
2.0 KiB
C++
//===-- llvm/IR/Comdat.h - Comdat definitions -------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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/ADT/StringRef.h"
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#include "llvm/Support/Compiler.h"
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namespace llvm {
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class raw_ostream;
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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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NoDuplicates, ///< No other Module may specify this COMDAT.
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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(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) 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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Comdat(SelectionKind SK, StringMapEntry<Comdat> *Name);
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Comdat(const Comdat &) LLVM_DELETED_FUNCTION;
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// Points to the map in Module.
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StringMapEntry<Comdat> *Name;
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SelectionKind SK;
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};
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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 llvm namespace
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#endif
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