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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
72 lines
2.6 KiB
C++
72 lines
2.6 KiB
C++
/*===-- llvm-c/Comdat.h - Module Comdat C Interface -------------*- C++ -*-===*\
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|* *|
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|* Part of the LLVM Project, under the Apache License v2.0 with LLVM *|
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|* 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 defines the C interface to COMDAT. *|
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|* *|
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\*===----------------------------------------------------------------------===*/
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#ifndef LLVM_C_COMDAT_H
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#define LLVM_C_COMDAT_H
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#include "llvm-c/ExternC.h"
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#include "llvm-c/Types.h"
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LLVM_C_EXTERN_C_BEGIN
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typedef enum {
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LLVMAnyComdatSelectionKind, ///< The linker may choose any COMDAT.
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LLVMExactMatchComdatSelectionKind, ///< The data referenced by the COMDAT must
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///< be the same.
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LLVMLargestComdatSelectionKind, ///< The linker will choose the largest
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///< COMDAT.
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LLVMNoDeduplicateComdatSelectionKind, ///< No deduplication is performed.
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LLVMSameSizeComdatSelectionKind ///< The data referenced by the COMDAT must be
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///< the same size.
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} LLVMComdatSelectionKind;
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/**
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* Return the Comdat in the module with the specified name. It is created
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* if it didn't already exist.
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*
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* @see llvm::Module::getOrInsertComdat()
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*/
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LLVMComdatRef LLVMGetOrInsertComdat(LLVMModuleRef M, const char *Name);
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/**
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* Get the Comdat assigned to the given global object.
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*
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* @see llvm::GlobalObject::getComdat()
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*/
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LLVMComdatRef LLVMGetComdat(LLVMValueRef V);
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/**
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* Assign the Comdat to the given global object.
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*
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* @see llvm::GlobalObject::setComdat()
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*/
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void LLVMSetComdat(LLVMValueRef V, LLVMComdatRef C);
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/*
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* Get the conflict resolution selection kind for the Comdat.
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*
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* @see llvm::Comdat::getSelectionKind()
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*/
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LLVMComdatSelectionKind LLVMGetComdatSelectionKind(LLVMComdatRef C);
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/*
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* Set the conflict resolution selection kind for the Comdat.
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*
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* @see llvm::Comdat::setSelectionKind()
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*/
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void LLVMSetComdatSelectionKind(LLVMComdatRef C, LLVMComdatSelectionKind Kind);
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LLVM_C_EXTERN_C_END
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#endif
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