9316c40a1b
.gnu.linkonce sections are similar to section groups. They were supported before section groups existed and provided a way to resolve COMDAT sections using a different design. There are few implementations that use .gnu.linkonce sections to store simple floating point constants which doesnot require complex section group support but need a way to store only one copy of the floating point constant in a binary. .gnu.linkonce based symbol resolution achieves that. Review : http://llvm-reviews.chandlerc.com/D3242 llvm-svn: 205280
86 lines
1.9 KiB
C++
86 lines
1.9 KiB
C++
//===- DefinedAtom.cpp ------------------------------------------*- C++ -*-===//
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//
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// The LLVM Linker
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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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#include "llvm/Support/ErrorHandling.h"
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#include "lld/Core/DefinedAtom.h"
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namespace lld {
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DefinedAtom::ContentPermissions DefinedAtom::permissions() const {
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// By default base permissions on content type.
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return permissions(this->contentType());
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}
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// Utility function for deriving permissions from content type
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DefinedAtom::ContentPermissions DefinedAtom::permissions(ContentType type) {
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switch (type) {
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case typeCode:
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case typeResolver:
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case typeBranchIsland:
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case typeBranchShim:
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case typeStub:
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case typeStubHelper:
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return permR_X;
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case typeConstant:
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case typeCString:
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case typeUTF16String:
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case typeCFI:
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case typeLSDA:
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case typeLiteral4:
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case typeLiteral8:
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case typeLiteral16:
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case typeDTraceDOF:
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case typeCompactUnwindInfo:
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case typeRONote:
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case typeNoAlloc:
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return permR__;
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case typeData:
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case typeDataFast:
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case typeZeroFill:
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case typeZeroFillFast:
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case typeObjC1Class:
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case typeLazyPointer:
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case typeLazyDylibPointer:
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case typeThunkTLV:
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case typeRWNote:
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return permRW_;
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case typeGOT:
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case typeConstData:
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case typeCFString:
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case typeInitializerPtr:
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case typeTerminatorPtr:
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case typeCStringPtr:
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case typeObjCClassPtr:
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case typeObjC2CategoryList:
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case typeTLVInitialData:
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case typeTLVInitialZeroFill:
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case typeTLVInitializerPtr:
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case typeThreadData:
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case typeThreadZeroFill:
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return permRW_L;
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case typeGroupComdat:
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case typeGnuLinkOnce:
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case typeUnknown:
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case typeTempLTO:
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return permUnknown;
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}
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llvm_unreachable("unknown content type");
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}
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} // namespace
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