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0a70f9b3b9
Given bar = foo + 4 .long bar MC would eat the 4. GNU as includes it in the relocation. The rule seems to be that a variable that defines a symbol is used in the relocation and one that does not define a symbol is evaluated and the result included in the relocation. Fixing this unfortunately required some other changes: * Since the variable is now evaluated, it would prevent the ELF writer from noticing the weakref marker the elf streamer uses. This patch then replaces that with a VariantKind in MCSymbolRefExpr. * Using VariantKind then requires us to look past other VariantKind to see .weakref bar,foo call bar@PLT doing this also fixes zed = foo +2 call zed@PLT so that is a good thing. * Looking past VariantKind means that the relocation selection has to use the fixup instead of the target. This is a reboot of the previous fixes for MC. I will watch the sanitizer buildbot and wait for a build before adding back the previous fixes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204294 91177308-0d34-0410-b5e6-96231b3b80d8
60 lines
2.4 KiB
C++
60 lines
2.4 KiB
C++
//===- MCELFSymbolFlags.h - ELF Symbol Flags ----------------*- 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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// This file declares the SymbolFlags used for the ELF target.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_MCELFSYMBOLFLAGS_H
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#define LLVM_MC_MCELFSYMBOLFLAGS_H
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#include "llvm/Support/ELF.h"
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// Because all the symbol flags need to be stored in the MCSymbolData
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// 'flags' variable we need to provide shift constants per flag type.
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namespace llvm {
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enum {
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ELF_STT_Shift = 0, // Shift value for STT_* flags.
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ELF_STB_Shift = 4, // Shift value for STB_* flags.
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ELF_STV_Shift = 8, // Shift value for STV_* flags.
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ELF_STO_Shift = 10, // Shift value for STO_* flags.
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ELF_Other_Shift = 16 // Shift value for llvm local flags,
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// not part of the final object file
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};
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enum ELFSymbolFlags {
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ELF_STB_Local = (ELF::STB_LOCAL << ELF_STB_Shift),
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ELF_STB_Global = (ELF::STB_GLOBAL << ELF_STB_Shift),
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ELF_STB_Weak = (ELF::STB_WEAK << ELF_STB_Shift),
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ELF_STB_Loproc = (ELF::STB_LOPROC << ELF_STB_Shift),
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ELF_STB_Hiproc = (ELF::STB_HIPROC << ELF_STB_Shift),
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ELF_STT_Notype = (ELF::STT_NOTYPE << ELF_STT_Shift),
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ELF_STT_Object = (ELF::STT_OBJECT << ELF_STT_Shift),
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ELF_STT_Func = (ELF::STT_FUNC << ELF_STT_Shift),
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ELF_STT_Section = (ELF::STT_SECTION << ELF_STT_Shift),
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ELF_STT_File = (ELF::STT_FILE << ELF_STT_Shift),
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ELF_STT_Common = (ELF::STT_COMMON << ELF_STT_Shift),
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ELF_STT_Tls = (ELF::STT_TLS << ELF_STT_Shift),
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ELF_STT_Loproc = (ELF::STT_LOPROC << ELF_STT_Shift),
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ELF_STT_Hiproc = (ELF::STT_HIPROC << ELF_STT_Shift),
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ELF_STV_Default = (ELF::STV_DEFAULT << ELF_STV_Shift),
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ELF_STV_Internal = (ELF::STV_INTERNAL << ELF_STV_Shift),
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ELF_STV_Hidden = (ELF::STV_HIDDEN << ELF_STV_Shift),
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ELF_STV_Protected = (ELF::STV_PROTECTED << ELF_STV_Shift),
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ELF_Other_ThumbFunc = (1 << ELF_Other_Shift)
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};
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} // end namespace llvm
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#endif
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