bde4144338
This patch provides generation of .ARM.exidx & .ARM.extab sections which are used for unwinding. The patch adds new content type typeARMExidx for atoms from .ARM.exidx section and integration of atoms with such type to the ELF ReaderWriter. exidx.test has been added with checking of contents of .ARM.exidx section and .ARM.extab section. Differential Revision: http://reviews.llvm.org/D9324 llvm-svn: 236873
98 lines
2.4 KiB
C++
98 lines
2.4 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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#include "lld/Core/File.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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case typeMachHeader:
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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 typeProcessedUnwindInfo:
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case typeRONote:
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case typeNoAlloc:
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case typeARMExidx:
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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 typeInterposingTuples:
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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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bool DefinedAtom::compareByPosition(const DefinedAtom *lhs,
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const DefinedAtom *rhs) {
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if (lhs == rhs)
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return false;
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const File *lhsFile = &lhs->file();
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const File *rhsFile = &rhs->file();
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if (lhsFile->ordinal() != rhsFile->ordinal())
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return lhsFile->ordinal() < rhsFile->ordinal();
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assert(lhs->ordinal() != rhs->ordinal());
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return lhs->ordinal() < rhs->ordinal();
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}
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} // namespace
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