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author | Rafael Espindola <rafael.espindola@gmail.com> | 2014-03-19 00:13:43 +0000 |
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committer | Rafael Espindola <rafael.espindola@gmail.com> | 2014-03-19 00:13:43 +0000 |
commit | 025e94d7dc8611fa8f5704905636f07e5e95b6f4 (patch) | |
tree | ea0b39cae7688db051639536eeb192e4d83c6439 /lib/MC/ELFObjectWriter.cpp | |
parent | 56ce2f5ab83a2975970eeadfc1b61f96b4c50c22 (diff) | |
download | llvm-025e94d7dc8611fa8f5704905636f07e5e95b6f4.tar.gz llvm-025e94d7dc8611fa8f5704905636f07e5e95b6f4.tar.bz2 llvm-025e94d7dc8611fa8f5704905636f07e5e95b6f4.tar.xz |
Revert "Add back r203962, r204028 and r204059."
This reverts commit r204178.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204203 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/MC/ELFObjectWriter.cpp')
-rw-r--r-- | lib/MC/ELFObjectWriter.cpp | 97 |
1 files changed, 39 insertions, 58 deletions
diff --git a/lib/MC/ELFObjectWriter.cpp b/lib/MC/ELFObjectWriter.cpp index dd06304b71..909ea80083 100644 --- a/lib/MC/ELFObjectWriter.cpp +++ b/lib/MC/ELFObjectWriter.cpp @@ -271,7 +271,6 @@ class ELFObjectWriter : public MCObjectWriter { /// \param RevGroupMap - Maps a signature symbol to the group section. /// \param NumRegularSections - Number of non-relocation sections. void ComputeSymbolTable(MCAssembler &Asm, - const MCAsmLayout &Layout, const SectionIndexMapTy &SectionIndexMap, RevGroupMapTy RevGroupMap, unsigned NumRegularSections); @@ -463,47 +462,33 @@ void ELFObjectWriter::WriteSymbolEntry(MCDataFragment *SymtabF, } } -uint64_t ELFObjectWriter::SymbolValue(MCSymbolData &OrigData, +uint64_t ELFObjectWriter::SymbolValue(MCSymbolData &Data, const MCAsmLayout &Layout) { - MCSymbolData *Data = &OrigData; - if (Data->isCommon() && Data->isExternal()) - return Data->getCommonAlignment(); - - const MCSymbol *Symbol = &Data->getSymbol(); - const bool IsThumbFunc = OrigData.getFlags() & ELF_Other_ThumbFunc; - - uint64_t Res = 0; - if (Symbol->isVariable()) { - const MCExpr *Expr = Symbol->getVariableValue(); - MCValue Value; - if (!Expr->EvaluateAsRelocatable(Value, &Layout)) - return 0; - if (Value.getSymB()) - return 0; - - Res = Value.getConstant(); - if (IsThumbFunc) - Res |= 1; - - const MCSymbolRefExpr *A = Value.getSymA(); - if (!A) - return Res; - - Symbol = &A->getSymbol(); - Data = &Layout.getAssembler().getSymbolData(*Symbol); + if (Data.isCommon() && Data.isExternal()) + return Data.getCommonAlignment(); + + const MCSymbol &Symbol = Data.getSymbol(); + + if (Symbol.isAbsolute() && Symbol.isVariable()) { + if (const MCExpr *Value = Symbol.getVariableValue()) { + int64_t IntValue; + if (Value->EvaluateAsAbsolute(IntValue, Layout)) + return (uint64_t)IntValue; + } } - if (!Symbol->isInSection()) + if (!Symbol.isInSection()) return 0; - if (!Data->getFragment()) - return 0; - Res += Layout.getSymbolOffset(Data); - if (IsThumbFunc || Data->getFlags() & ELF_Other_ThumbFunc) - Res |= 1; + if (Data.getFragment()) { + if (Data.getFlags() & ELF_Other_ThumbFunc) + return Layout.getSymbolOffset(&Data)+1; + else + return Layout.getSymbolOffset(&Data); + } - return Res; + return 0; } void ELFObjectWriter::ExecutePostLayoutBinding(MCAssembler &Asm, @@ -584,9 +569,8 @@ void ELFObjectWriter::WriteSymbol(MCDataFragment *SymtabF, ELFSymbolData &MSD, const MCAsmLayout &Layout) { MCSymbolData &OrigData = *MSD.SymbolData; - const MCSymbol *Base = OrigData.getSymbol().getBaseSymbol(Layout); - const MCSymbolData &Data = - Base ? Layout.getAssembler().getSymbolData(*Base) : OrigData; + MCSymbolData &Data = + Layout.getAssembler().getSymbolData(OrigData.getSymbol().AliasedSymbol()); bool IsReserved = Data.isCommon() || Data.getSymbol().isAbsolute() || Data.getSymbol().isVariable(); @@ -594,8 +578,6 @@ void ELFObjectWriter::WriteSymbol(MCDataFragment *SymtabF, // Binding and Type share the same byte as upper and lower nibbles uint8_t Binding = MCELF::GetBinding(OrigData); uint8_t Type = mergeTypeForSet(MCELF::GetType(OrigData), MCELF::GetType(Data)); - if (OrigData.getFlags() & ELF_Other_ThumbFunc) - Type = ELF::STT_FUNC; uint8_t Info = (Binding << ELF_STB_Shift) | (Type << ELF_STT_Shift); // Other and Visibility share the same byte with Visibility using the lower @@ -604,7 +586,7 @@ void ELFObjectWriter::WriteSymbol(MCDataFragment *SymtabF, uint8_t Other = MCELF::getOther(OrigData) << (ELF_STO_Shift - ELF_STV_Shift); Other |= Visibility; - uint64_t Value = SymbolValue(OrigData, Layout); + uint64_t Value = SymbolValue(Data, Layout); uint64_t Size = 0; assert(!(Data.isCommon() && !Data.isExternal())); @@ -915,11 +897,10 @@ void ELFObjectWriter::ComputeIndexMap(MCAssembler &Asm, } } -void -ELFObjectWriter::ComputeSymbolTable(MCAssembler &Asm, const MCAsmLayout &Layout, - const SectionIndexMapTy &SectionIndexMap, - RevGroupMapTy RevGroupMap, - unsigned NumRegularSections) { +void ELFObjectWriter::ComputeSymbolTable(MCAssembler &Asm, + const SectionIndexMapTy &SectionIndexMap, + RevGroupMapTy RevGroupMap, + unsigned NumRegularSections) { // FIXME: Is this the correct place to do this? // FIXME: Why is an undefined reference to _GLOBAL_OFFSET_TABLE_ needed? if (NeedsGOT) { @@ -967,33 +948,33 @@ ELFObjectWriter::ComputeSymbolTable(MCAssembler &Asm, const MCAsmLayout &Layout, ELFSymbolData MSD; MSD.SymbolData = it; - const MCSymbol *BaseSymbol = Symbol.getBaseSymbol(Layout); + const MCSymbol &RefSymbol = Symbol.AliasedSymbol(); // Undefined symbols are global, but this is the first place we // are able to set it. bool Local = isLocal(*it, isSignature, Used); if (!Local && MCELF::GetBinding(*it) == ELF::STB_LOCAL) { - assert(BaseSymbol); - MCSymbolData &SD = Asm.getSymbolData(*BaseSymbol); + MCSymbolData &SD = Asm.getSymbolData(RefSymbol); MCELF::SetBinding(*it, ELF::STB_GLOBAL); MCELF::SetBinding(SD, ELF::STB_GLOBAL); } - if (!BaseSymbol) { - MSD.SectionIndex = ELF::SHN_ABS; - } else if (it->isCommon()) { + if (RefSymbol.isUndefined() && !Used && WeakrefUsed) + MCELF::SetBinding(*it, ELF::STB_WEAK); + + if (it->isCommon()) { assert(!Local); MSD.SectionIndex = ELF::SHN_COMMON; - } else if (BaseSymbol->isUndefined()) { + } else if (Symbol.isAbsolute() || RefSymbol.isVariable()) { + MSD.SectionIndex = ELF::SHN_ABS; + } else if (RefSymbol.isUndefined()) { if (isSignature && !Used) MSD.SectionIndex = SectionIndexMap.lookup(RevGroupMap[&Symbol]); else MSD.SectionIndex = ELF::SHN_UNDEF; - if (!Used && WeakrefUsed) - MCELF::SetBinding(*it, ELF::STB_WEAK); } else { const MCSectionELF &Section = - static_cast<const MCSectionELF&>(BaseSymbol->getSection()); + static_cast<const MCSectionELF&>(RefSymbol.getSection()); MSD.SectionIndex = SectionIndexMap.lookup(&Section); if (MSD.SectionIndex >= ELF::SHN_LORESERVE) NeedsSymtabShndx = true; @@ -1579,8 +1560,8 @@ void ELFObjectWriter::WriteObject(MCAssembler &Asm, unsigned NumRegularSections = NumUserSections + NumIndexedSections; // Compute symbol table information. - ComputeSymbolTable(Asm, Layout, SectionIndexMap, RevGroupMap, - NumRegularSections); + ComputeSymbolTable(Asm, SectionIndexMap, RevGroupMap, NumRegularSections); + WriteRelocations(Asm, const_cast<MCAsmLayout&>(Layout), RelMap); |