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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
78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
//===- Comdat.cpp - Implement Metadata classes ----------------------------===//
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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 Comdat class (including the C bindings).
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//
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//===----------------------------------------------------------------------===//
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#include "llvm-c/Comdat.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/IR/Comdat.h"
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#include "llvm/IR/GlobalObject.h"
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#include "llvm/IR/Module.h"
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using namespace llvm;
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Comdat::Comdat(Comdat &&C) : Name(C.Name), SK(C.SK) {}
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Comdat::Comdat() = default;
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StringRef Comdat::getName() const { return Name->first(); }
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LLVMComdatRef LLVMGetOrInsertComdat(LLVMModuleRef M, const char *Name) {
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return wrap(unwrap(M)->getOrInsertComdat(Name));
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}
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LLVMComdatRef LLVMGetComdat(LLVMValueRef V) {
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GlobalObject *G = unwrap<GlobalObject>(V);
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return wrap(G->getComdat());
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}
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void LLVMSetComdat(LLVMValueRef V, LLVMComdatRef C) {
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GlobalObject *G = unwrap<GlobalObject>(V);
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G->setComdat(unwrap(C));
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}
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LLVMComdatSelectionKind LLVMGetComdatSelectionKind(LLVMComdatRef C) {
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switch (unwrap(C)->getSelectionKind()) {
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case Comdat::Any:
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return LLVMAnyComdatSelectionKind;
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case Comdat::ExactMatch:
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return LLVMExactMatchComdatSelectionKind;
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case Comdat::Largest:
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return LLVMLargestComdatSelectionKind;
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case Comdat::NoDeduplicate:
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return LLVMNoDeduplicateComdatSelectionKind;
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case Comdat::SameSize:
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return LLVMSameSizeComdatSelectionKind;
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}
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llvm_unreachable("Invalid Comdat SelectionKind!");
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}
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void LLVMSetComdatSelectionKind(LLVMComdatRef C, LLVMComdatSelectionKind kind) {
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Comdat *Cd = unwrap(C);
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switch (kind) {
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case LLVMAnyComdatSelectionKind:
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Cd->setSelectionKind(Comdat::Any);
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break;
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case LLVMExactMatchComdatSelectionKind:
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Cd->setSelectionKind(Comdat::ExactMatch);
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break;
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case LLVMLargestComdatSelectionKind:
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Cd->setSelectionKind(Comdat::Largest);
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break;
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case LLVMNoDeduplicateComdatSelectionKind:
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Cd->setSelectionKind(Comdat::NoDeduplicate);
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break;
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case LLVMSameSizeComdatSelectionKind:
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Cd->setSelectionKind(Comdat::SameSize);
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break;
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}
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}
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