diff options
Diffstat (limited to 'lib/Target/TargetLoweringObjectFile.cpp')
| -rw-r--r-- | lib/Target/TargetLoweringObjectFile.cpp | 844 |
1 files changed, 32 insertions, 812 deletions
diff --git a/lib/Target/TargetLoweringObjectFile.cpp b/lib/Target/TargetLoweringObjectFile.cpp index a231ebc..82619c7 100644 --- a/lib/Target/TargetLoweringObjectFile.cpp +++ b/lib/Target/TargetLoweringObjectFile.cpp @@ -19,17 +19,15 @@ #include "llvm/GlobalVariable.h" #include "llvm/MC/MCContext.h" #include "llvm/MC/MCExpr.h" -#include "llvm/MC/MCSectionMachO.h" -#include "llvm/MC/MCSectionELF.h" #include "llvm/MC/MCSymbol.h" #include "llvm/Target/Mangler.h" #include "llvm/Target/TargetData.h" #include "llvm/Target/TargetMachine.h" #include "llvm/Target/TargetOptions.h" +#include "llvm/Support/Dwarf.h" #include "llvm/Support/ErrorHandling.h" #include "llvm/Support/raw_ostream.h" #include "llvm/ADT/SmallString.h" -#include "llvm/ADT/StringExtras.h" using namespace llvm; //===----------------------------------------------------------------------===// @@ -289,832 +287,54 @@ TargetLoweringObjectFile::getSectionForConstant(SectionKind Kind) const { } /// getSymbolForDwarfGlobalReference - Return an MCExpr to use for a -/// pc-relative reference to the specified global variable from exception -/// handling information. In addition to the symbol, this returns -/// by-reference: -/// -/// IsIndirect - True if the returned symbol is actually a stub that contains -/// the address of the symbol, false if the symbol is the global itself. -/// -/// IsPCRel - True if the symbol reference is already pc-relative, false if -/// the caller needs to subtract off the address of the reference from the -/// symbol. -/// +/// reference to the specified global variable from exception +/// handling information. const MCExpr *TargetLoweringObjectFile:: getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang, - MachineModuleInfo *MMI, - bool &IsIndirect, bool &IsPCRel) const { - // The generic implementation of this just returns a direct reference to the - // symbol. - IsIndirect = false; - IsPCRel = false; - + MachineModuleInfo *MMI, unsigned Encoding) const { // FIXME: Use GetGlobalValueSymbol. SmallString<128> Name; Mang->getNameWithPrefix(Name, GV, false); - return MCSymbolRefExpr::Create(Name.str(), getContext()); -} - - -//===----------------------------------------------------------------------===// -// ELF -//===----------------------------------------------------------------------===// -typedef StringMap<const MCSectionELF*> ELFUniqueMapTy; - -TargetLoweringObjectFileELF::~TargetLoweringObjectFileELF() { - // If we have the section uniquing map, free it. - delete (ELFUniqueMapTy*)UniquingMap; -} - -const MCSection *TargetLoweringObjectFileELF:: -getELFSection(StringRef Section, unsigned Type, unsigned Flags, - SectionKind Kind, bool IsExplicit) const { - if (UniquingMap == 0) - UniquingMap = new ELFUniqueMapTy(); - ELFUniqueMapTy &Map = *(ELFUniqueMapTy*)UniquingMap; - - // Do the lookup, if we have a hit, return it. - const MCSectionELF *&Entry = Map[Section]; - if (Entry) return Entry; - - return Entry = MCSectionELF::Create(Section, Type, Flags, Kind, IsExplicit, - getContext()); -} - -void TargetLoweringObjectFileELF::Initialize(MCContext &Ctx, - const TargetMachine &TM) { - if (UniquingMap != 0) - ((ELFUniqueMapTy*)UniquingMap)->clear(); - TargetLoweringObjectFile::Initialize(Ctx, TM); - - BSSSection = - getELFSection(".bss", MCSectionELF::SHT_NOBITS, - MCSectionELF::SHF_WRITE | MCSectionELF::SHF_ALLOC, - SectionKind::getBSS()); - - TextSection = - getELFSection(".text", MCSectionELF::SHT_PROGBITS, - MCSectionELF::SHF_EXECINSTR | MCSectionELF::SHF_ALLOC, - SectionKind::getText()); - - DataSection = - getELFSection(".data", MCSectionELF::SHT_PROGBITS, - MCSectionELF::SHF_WRITE | MCSectionELF::SHF_ALLOC, - SectionKind::getDataRel()); - - ReadOnlySection = - getELFSection(".rodata", MCSectionELF::SHT_PROGBITS, - MCSectionELF::SHF_ALLOC, - SectionKind::getReadOnly()); - - TLSDataSection = - getELFSection(".tdata", MCSectionELF::SHT_PROGBITS, - MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_TLS | - MCSectionELF::SHF_WRITE, SectionKind::getThreadData()); - - TLSBSSSection = - getELFSection(".tbss", MCSectionELF::SHT_NOBITS, - MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_TLS | - MCSectionELF::SHF_WRITE, SectionKind::getThreadBSS()); - - DataRelSection = - getELFSection(".data.rel", MCSectionELF::SHT_PROGBITS, - MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE, - SectionKind::getDataRel()); - - DataRelLocalSection = - getELFSection(".data.rel.local", MCSectionELF::SHT_PROGBITS, - MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE, - SectionKind::getDataRelLocal()); - - DataRelROSection = - getELFSection(".data.rel.ro", MCSectionELF::SHT_PROGBITS, - MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE, - SectionKind::getReadOnlyWithRel()); - - DataRelROLocalSection = - getELFSection(".data.rel.ro.local", MCSectionELF::SHT_PROGBITS, - MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE, - SectionKind::getReadOnlyWithRelLocal()); - - MergeableConst4Section = - getELFSection(".rodata.cst4", MCSectionELF::SHT_PROGBITS, - MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_MERGE, - SectionKind::getMergeableConst4()); - - MergeableConst8Section = - getELFSection(".rodata.cst8", MCSectionELF::SHT_PROGBITS, - MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_MERGE, - SectionKind::getMergeableConst8()); - - MergeableConst16Section = - getELFSection(".rodata.cst16", MCSectionELF::SHT_PROGBITS, - MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_MERGE, - SectionKind::getMergeableConst16()); - - StaticCtorSection = - getELFSection(".ctors", MCSectionELF::SHT_PROGBITS, - MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE, - SectionKind::getDataRel()); - - StaticDtorSection = - getELFSection(".dtors", MCSectionELF::SHT_PROGBITS, - MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE, - SectionKind::getDataRel()); - - // Exception Handling Sections. - - // FIXME: We're emitting LSDA info into a readonly section on ELF, even though - // it contains relocatable pointers. In PIC mode, this is probably a big - // runtime hit for C++ apps. Either the contents of the LSDA need to be - // adjusted or this should be a data section. - LSDASection = - getELFSection(".gcc_except_table", MCSectionELF::SHT_PROGBITS, - MCSectionELF::SHF_ALLOC, SectionKind::getReadOnly()); - EHFrameSection = - getELFSection(".eh_frame", MCSectionELF::SHT_PROGBITS, - MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE, - SectionKind::getDataRel()); - - // Debug Info Sections. - DwarfAbbrevSection = - getELFSection(".debug_abbrev", MCSectionELF::SHT_PROGBITS, 0, - SectionKind::getMetadata()); - DwarfInfoSection = - getELFSection(".debug_info", MCSectionELF::SHT_PROGBITS, 0, - SectionKind::getMetadata()); - DwarfLineSection = - getELFSection(".debug_line", MCSectionELF::SHT_PROGBITS, 0, - SectionKind::getMetadata()); - DwarfFrameSection = - getELFSection(".debug_frame", MCSectionELF::SHT_PROGBITS, 0, - SectionKind::getMetadata()); - DwarfPubNamesSection = - getELFSection(".debug_pubnames", MCSectionELF::SHT_PROGBITS, 0, - SectionKind::getMetadata()); - DwarfPubTypesSection = - getELFSection(".debug_pubtypes", MCSectionELF::SHT_PROGBITS, 0, - SectionKind::getMetadata()); - DwarfStrSection = - getELFSection(".debug_str", MCSectionELF::SHT_PROGBITS, 0, - SectionKind::getMetadata()); - DwarfLocSection = - getELFSection(".debug_loc", MCSectionELF::SHT_PROGBITS, 0, - SectionKind::getMetadata()); - DwarfARangesSection = - getELFSection(".debug_aranges", MCSectionELF::SHT_PROGBITS, 0, - SectionKind::getMetadata()); - DwarfRangesSection = - getELFSection(".debug_ranges", MCSectionELF::SHT_PROGBITS, 0, - SectionKind::getMetadata()); - DwarfMacroInfoSection = - getELFSection(".debug_macinfo", MCSectionELF::SHT_PROGBITS, 0, - SectionKind::getMetadata()); -} - - -static SectionKind -getELFKindForNamedSection(StringRef Name, SectionKind K) { - if (Name.empty() || Name[0] != '.') return K; - - // Some lame default implementation based on some magic section names. - if (Name == ".bss" || - Name.startswith(".bss.") || - Name.startswith(".gnu.linkonce.b.") || - Name.startswith(".llvm.linkonce.b.") || - Name == ".sbss" || - Name.startswith(".sbss.") || - Name.startswith(".gnu.linkonce.sb.") || - Name.startswith(".llvm.linkonce.sb.")) - return SectionKind::getBSS(); - - if (Name == ".tdata" || - Name.startswith(".tdata.") || - Name.startswith(".gnu.linkonce.td.") || - Name.startswith(".llvm.linkonce.td.")) - return SectionKind::getThreadData(); - - if (Name == ".tbss" || - Name.startswith(".tbss.") || - Name.startswith(".gnu.linkonce.tb.") || - Name.startswith(".llvm.linkonce.tb.")) - return SectionKind::getThreadBSS(); - - return K; -} - - -static unsigned getELFSectionType(StringRef Name, SectionKind K) { - - if (Name == ".init_array") - return MCSectionELF::SHT_INIT_ARRAY; - - if (Name == ".fini_array") - return MCSectionELF::SHT_FINI_ARRAY; + const MCSymbol *Sym = getContext().GetOrCreateSymbol(Name.str()); - if (Name == ".preinit_array") - return MCSectionELF::SHT_PREINIT_ARRAY; - - if (K.isBSS() || K.isThreadBSS()) - return MCSectionELF::SHT_NOBITS; - - return MCSectionELF::SHT_PROGBITS; -} - - -static unsigned -getELFSectionFlags(SectionKind K) { - unsigned Flags = 0; - - if (!K.isMetadata()) - Flags |= MCSectionELF::SHF_ALLOC; - - if (K.isText()) - Flags |= MCSectionELF::SHF_EXECINSTR; - - if (K.isWriteable()) - Flags |= MCSectionELF::SHF_WRITE; - - if (K.isThreadLocal()) - Flags |= MCSectionELF::SHF_TLS; - - // K.isMergeableConst() is left out to honour PR4650 - if (K.isMergeableCString() || K.isMergeableConst4() || - K.isMergeableConst8() || K.isMergeableConst16()) - Flags |= MCSectionELF::SHF_MERGE; - - if (K.isMergeableCString()) - Flags |= MCSectionELF::SHF_STRINGS; - - return Flags; -} - - -const MCSection *TargetLoweringObjectFileELF:: -getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind, - Mangler *Mang, const TargetMachine &TM) const { - StringRef SectionName = GV->getSection(); - - // Infer section flags from the section name if we can. - Kind = getELFKindForNamedSection(SectionName, Kind); - - return getELFSection(SectionName, - getELFSectionType(SectionName, Kind), - getELFSectionFlags(Kind), Kind, true); -} - -static const char *getSectionPrefixForUniqueGlobal(SectionKind Kind) { - if (Kind.isText()) return ".gnu.linkonce.t."; - if (Kind.isReadOnly()) return ".gnu.linkonce.r."; - - if (Kind.isThreadData()) return ".gnu.linkonce.td."; - if (Kind.isThreadBSS()) return ".gnu.linkonce.tb."; - - if (Kind.isDataNoRel()) return ".gnu.linkonce.d."; - if (Kind.isDataRelLocal()) return ".gnu.linkonce.d.rel.local."; - if (Kind.isDataRel()) return ".gnu.linkonce.d.rel."; - if (Kind.isReadOnlyWithRelLocal()) return ".gnu.linkonce.d.rel.ro.local."; - - assert(Kind.isReadOnlyWithRel() && "Unknown section kind"); - return ".gnu.linkonce.d.rel.ro."; + return getSymbolForDwarfReference(Sym, MMI, Encoding); } -const MCSection *TargetLoweringObjectFileELF:: -SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind, - Mangler *Mang, const TargetMachine &TM) const { - - // If this global is linkonce/weak and the target handles this by emitting it - // into a 'uniqued' section name, create and return the section now. - if (GV->isWeakForLinker() && !Kind.isCommon() && !Kind.isBSS()) { - const char *Prefix = getSectionPrefixForUniqueGlobal(Kind); - SmallString<128> Name; - Name.append(Prefix, Prefix+strlen(Prefix)); - Mang->getNameWithPrefix(Name, GV, false); - return getELFSection(Name.str(), getELFSectionType(Name.str(), Kind), - getELFSectionFlags(Kind), Kind); - } - - if (Kind.isText()) return TextSection; - - if (Kind.isMergeable1ByteCString() || - Kind.isMergeable2ByteCString() || - Kind.isMergeable4ByteCString()) { - - // We also need alignment here. - // FIXME: this is getting the alignment of the character, not the - // alignment of the global! - unsigned Align = - TM.getTargetData()->getPreferredAlignment(cast<GlobalVariable>(GV)); - - const char *SizeSpec = ".rodata.str1."; - if (Kind.isMergeable2ByteCString()) - SizeSpec = ".rodata.str2."; - else if (Kind.isMergeable4ByteCString()) - SizeSpec = ".rodata.str4."; - else - assert(Kind.isMergeable1ByteCString() && "unknown string width"); - - - std::string Name = SizeSpec + utostr(Align); - return getELFSection(Name, MCSectionELF::SHT_PROGBITS, - MCSectionELF::SHF_ALLOC | - MCSectionELF::SHF_MERGE | - MCSectionELF::SHF_STRINGS, - Kind); - } - - if (Kind.isMergeableConst()) { - if (Kind.isMergeableConst4() && MergeableConst4Section) - return MergeableConst4Section; - if (Kind.isMergeableConst8() && MergeableConst8Section) - return MergeableConst8Section; - if (Kind.isMergeableConst16() && MergeableConst16Section) - return MergeableConst16Section; - return ReadOnlySection; // .const - } - - if (Kind.isReadOnly()) return ReadOnlySection; - - if (Kind.isThreadData()) return TLSDataSection; - if (Kind.isThreadBSS()) return TLSBSSSection; - - // Note: we claim that common symbols are put in BSSSection, but they are - // really emitted with the magic .comm directive, which creates a symbol table - // entry but not a section. - if (Kind.isBSS() || Kind.isCommon()) return BSSSection; - - if (Kind.isDataNoRel()) return DataSection; - if (Kind.isDataRelLocal()) return DataRelLocalSection; - if (Kind.isDataRel()) return DataRelSection; - if (Kind.isReadOnlyWithRelLocal()) return DataRelROLocalSection; - - assert(Kind.isReadOnlyWithRel() && "Unknown section kind"); - return DataRelROSection; -} - -/// getSectionForConstant - Given a mergeable constant with the -/// specified size and relocation information, return a section that it -/// should be placed in. -const MCSection *TargetLoweringObjectFileELF:: -getSectionForConstant(SectionKind Kind) const { - if (Kind.isMergeableConst4() && MergeableConst4Section) - return MergeableConst4Section; - if (Kind.isMergeableConst8() && MergeableConst8Section) - return MergeableConst8Section; - if (Kind.isMergeableConst16() && MergeableConst16Section) - return MergeableConst16Section; - if (Kind.isReadOnly()) - return ReadOnlySection; - - if (Kind.isReadOnlyWithRelLocal()) return DataRelROLocalSection; - assert(Kind.isReadOnlyWithRel() && "Unknown section kind"); - return DataRelROSection; -} - -//===----------------------------------------------------------------------===// -// MachO -//===----------------------------------------------------------------------===// - -typedef StringMap<const MCSectionMachO*> MachOUniqueMapTy; - -TargetLoweringObjectFileMachO::~TargetLoweringObjectFileMachO() { - // If we have the MachO uniquing map, free it. - delete (MachOUniqueMapTy*)UniquingMap; -} - - -const MCSectionMachO *TargetLoweringObjectFileMachO:: -getMachOSection(StringRef Segment, StringRef Section, - unsigned TypeAndAttributes, - unsigned Reserved2, SectionKind Kind) const { - // We unique sections by their segment/section pair. The returned section - // may not have the same flags as the requested section, if so this should be - // diagnosed by the client as an error. - - // Create the map if it doesn't already exist. - if (UniquingMap == 0) - UniquingMap = new MachOUniqueMapTy(); - MachOUniqueMapTy &Map = *(MachOUniqueMapTy*)UniquingMap; - - // Form the name to look up. - SmallString<64> Name; - Name += Segment; - Name.push_back(','); - Name += Section; - - // Do the lookup, if we have a hit, return it. - const MCSectionMachO *&Entry = Map[Name.str()]; - if (Entry) return Entry; - - // Otherwise, return a new section. - return Entry = MCSectionMachO::Create(Segment, Section, TypeAndAttributes, - Reserved2, Kind, getContext()); -} - - -void TargetLoweringObjectFileMachO::Initialize(MCContext &Ctx, - const TargetMachine &TM) { - if (UniquingMap != 0) - ((MachOUniqueMapTy*)UniquingMap)->clear(); - TargetLoweringObjectFile::Initialize(Ctx, TM); - - TextSection // .text - = getMachOSection("__TEXT", "__text", - MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, - SectionKind::getText()); - DataSection // .data - = getMachOSection("__DATA", "__data", 0, SectionKind::getDataRel()); - - CStringSection // .cstring - = getMachOSection("__TEXT", "__cstring", MCSectionMachO::S_CSTRING_LITERALS, - SectionKind::getMergeable1ByteCString()); - UStringSection - = getMachOSection("__TEXT","__ustring", 0, - SectionKind::getMergeable2ByteCString()); - FourByteConstantSection // .literal4 - = getMachOSection("__TEXT", "__literal4", MCSectionMachO::S_4BYTE_LITERALS, - SectionKind::getMergeableConst4()); - EightByteConstantSection // .literal8 - = getMachOSection("__TEXT", "__literal8", MCSectionMachO::S_8BYTE_LITERALS, - SectionKind::getMergeableConst8()); - - // ld_classic doesn't support .literal16 in 32-bit mode, and ld64 falls back - // to using it in -static mode. - SixteenByteConstantSection = 0; - if (TM.getRelocationModel() != Reloc::Static && - TM.getTargetData()->getPointerSize() == 32) - SixteenByteConstantSection = // .literal16 - getMachOSection("__TEXT", "__literal16",MCSectionMachO::S_16BYTE_LITERALS, - SectionKind::getMergeableConst16()); - - ReadOnlySection // .const - = getMachOSection("__TEXT", "__const", 0, SectionKind::getReadOnly()); - - TextCoalSection - = getMachOSection("__TEXT", "__textcoal_nt", - MCSectionMachO::S_COALESCED | - MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, - SectionKind::getText()); - ConstTextCoalSection - = getMachOSection("__TEXT", "__const_coal", MCSectionMachO::S_COALESCED, - SectionKind::getText()); - ConstDataCoalSection - = getMachOSection("__DATA","__const_coal", MCSectionMachO::S_COALESCED, - SectionKind::getText()); - ConstDataSection // .const_data - = getMachOSection("__DATA", "__const", 0, - SectionKind::getReadOnlyWithRel()); - DataCoalSection - = getMachOSection("__DATA","__datacoal_nt", MCSectionMachO::S_COALESCED, - SectionKind::getDataRel()); - DataCommonSection - = getMachOSection("__DATA","__common", MCSectionMachO::S_ZEROFILL, - SectionKind::getBSS()); - DataBSSSection - = getMachOSection("__DATA","__bss", MCSectionMachO::S_ZEROFILL, - SectionKind::getBSS()); - - - LazySymbolPointerSection - = getMachOSection("__DATA", "__la_symbol_ptr", - MCSectionMachO::S_LAZY_SYMBOL_POINTERS, - SectionKind::getMetadata()); - NonLazySymbolPointerSection - = getMachOSection("__DATA", "__nl_symbol_ptr", - MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS, - SectionKind::getMetadata()); - - if (TM.getRelocationModel() == Reloc::Static) { - StaticCtorSection - = getMachOSection("__TEXT", "__constructor", 0,SectionKind::getDataRel()); - StaticDtorSection - = getMachOSection("__TEXT", "__destructor", 0, SectionKind::getDataRel()); - } else { - StaticCtorSection - = getMachOSection("__DATA", "__mod_init_func", - MCSectionMachO::S_MOD_INIT_FUNC_POINTERS, - SectionKind::getDataRel()); - StaticDtorSection - = getMachOSection("__DATA", "__mod_term_func", - MCSectionMachO::S_MOD_TERM_FUNC_POINTERS, - SectionKind::getDataRel()); - } - - // Exception Handling. - LSDASection = getMachOSection("__DATA", "__gcc_except_tab", 0, - SectionKind::getDataRel()); - EHFrameSection = - getMachOSection("__TEXT", "__eh_frame", - MCSectionMachO::S_COALESCED | - MCSectionMachO::S_ATTR_NO_TOC | - MCSectionMachO::S_ATTR_STRIP_STATIC_SYMS | - MCSectionMachO::S_ATTR_LIVE_SUPPORT, - SectionKind::getReadOnly()); - - // Debug Information. - DwarfAbbrevSection = - getMachOSection("__DWARF", "__debug_abbrev", MCSectionMachO::S_ATTR_DEBUG, - SectionKind::getMetadata()); - DwarfInfoSection = - getMachOSection("__DWARF", "__debug_info", MCSectionMachO::S_ATTR_DEBUG, - SectionKind::getMetadata()); - DwarfLineSection = - getMachOSection("__DWARF", "__debug_line", MCSectionMachO::S_ATTR_DEBUG, - SectionKind::getMetadata()); - DwarfFrameSection = - getMachOSection("__DWARF", "__debug_frame", MCSectionMachO::S_ATTR_DEBUG, - SectionKind::getMetadata()); - DwarfPubNamesSection = - getMachOSection("__DWARF", "__debug_pubnames", MCSectionMachO::S_ATTR_DEBUG, - SectionKind::getMetadata()); - DwarfPubTypesSection = - getMachOSection("__DWARF", "__debug_pubtypes", MCSectionMachO::S_ATTR_DEBUG, - SectionKind::getMetadata()); - DwarfStrSection = - getMachOSection("__DWARF", "__debug_str", MCSectionMachO::S_ATTR_DEBUG, - SectionKind::getMetadata()); - DwarfLocSection = - getMachOSection("__DWARF", "__debug_loc", MCSectionMachO::S_ATTR_DEBUG, - SectionKind::getMetadata()); - DwarfARangesSection = - getMachOSection("__DWARF", "__debug_aranges", MCSectionMachO::S_ATTR_DEBUG, - SectionKind::getMetadata()); - DwarfRangesSection = - getMachOSection("__DWARF", "__debug_ranges", MCSectionMachO::S_ATTR_DEBUG, - SectionKind::getMetadata()); - DwarfMacroInfoSection = - getMachOSection("__DWARF", "__debug_macinfo", MCSectionMachO::S_ATTR_DEBUG, - SectionKind::getMetadata()); - DwarfDebugInlineSection = - getMachOSection("__DWARF", "__debug_inlined", MCSectionMachO::S_ATTR_DEBUG, - SectionKind::getMetadata()); -} - -const MCSection *TargetLoweringObjectFileMachO:: -getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind, - Mangler *Mang, const TargetMachine &TM) const { - // Parse the section specifier and create it if valid. - StringRef Segment, Section; - unsigned TAA, StubSize; - std::string ErrorCode = - MCSectionMachO::ParseSectionSpecifier(GV->getSection(), Segment, Section, - TAA, StubSize); - if (!ErrorCode.empty()) { - // If invalid, report the error with llvm_report_error. - llvm_report_error("Global variable '" + GV->getNameStr() + - "' has an invalid section specifier '" + GV->getSection()+ - "': " + ErrorCode + "."); - // Fall back to dropping it into the data section. - return DataSection; - } - - // Get the section. - const MCSectionMachO *S = - getMachOSection(Segment, Section, TAA, StubSize, Kind); - - // Okay, now that we got the section, verify that the TAA & StubSize agree. - // If the user declared multiple globals with different section flags, we need - // to reject it here. - if (S->getTypeAndAttributes() != TAA || S->getStubSize() != StubSize) { - // If invalid, report the error with llvm_report_error. - llvm_report_error("Global variable '" + GV->getNameStr() + - "' section type or attributes does not match previous" - " section specifier"); - } - - return S; -} - -const MCSection *TargetLoweringObjectFileMachO:: -SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind, - Mangler *Mang, const TargetMachine &TM) const { - assert(!Kind.isThreadLocal() && "Darwin doesn't support TLS"); - - if (Kind.isText()) - return GV->isWeakForLinker() ? TextCoalSection : TextSection; - - // If this is weak/linkonce, put this in a coalescable section, either in text - // or data depending on if it is writable. - if (GV->isWeakForLinker()) { - if (Kind.isReadOnly()) - return ConstTextCoalSection; - return DataCoalSection; - } - - // FIXME: Alignment check should be handled by section classifier. - if (Kind.isMergeable1ByteCString() || - Kind.isMergeable2ByteCString()) { - if (TM.getTargetData()->getPreferredAlignment( - cast<GlobalVariable>(GV)) < 32) { - if (Kind.isMergeable1ByteCString()) - return CStringSection; - assert(Kind.isMergeable2ByteCString()); - return UStringSection; - } - } - - if (Kind.isMergeableConst()) { - if (Kind.isMergeableConst4()) - return FourByteConstantSection; - if (Kind.isMergeableConst8()) - return EightByteConstantSection; - if (Kind.isMergeableConst16() && SixteenByteConstantSection) - return SixteenByteConstantSection; - } - - // Otherwise, if it is readonly, but not something we can specially optimize, - // just drop it in .const. - if (Kind.isReadOnly()) - return ReadOnlySection; - - // If this is marked const, put it into a const section. But if the dynamic - // linker needs to write to it, put it in the data segment. - if (Kind.isReadOnlyWithRel()) - return ConstDataSection; - - // Put zero initialized globals with strong external linkage in the - // DATA, __common section with the .zerofill directive. - if (Kind.isBSSExtern()) - return DataCommonSection; - - // Put zero initialized globals with local linkage in __DATA,__bss directive - // with the .zerofill directive (aka .lcomm). - if (Kind.isBSSLocal()) - return DataBSSSection; - - // Otherwise, just drop the variable in the normal data section. - return DataSection; -} - -const MCSection * -TargetLoweringObjectFileMachO::getSectionForConstant(SectionKind Kind) const { - // If this constant requires a relocation, we have to put it in the data - // segment, not in the text segment. - if (Kind.isDataRel() || Kind.isReadOnlyWithRel()) - return ConstDataSection; - - if (Kind.isMergeableConst4()) - return FourByteConstantSection; - if (Kind.isMergeableConst8()) - return EightByteConstantSection; - if (Kind.isMergeableConst16() && SixteenByteConstantSection) - return SixteenByteConstantSection; - return ReadOnlySection; // .const -} - -/// shouldEmitUsedDirectiveFor - This hook allows targets to selectively decide -/// not to emit the UsedDirective for some symbols in llvm.used. -// FIXME: REMOVE this (rdar://7071300) -bool TargetLoweringObjectFileMachO:: -shouldEmitUsedDirectiveFor(const GlobalValue *GV, Mangler *Mang) const { - /// On Darwin, internally linked data beginning with "L" or "l" does not have - /// the directive emitted (this occurs in ObjC metadata). - if (!GV) return false; - - // Check whether the mangled name has the "Private" or "LinkerPrivate" prefix. - if (GV->hasLocalLinkage() && !isa<Function>(GV)) { - // FIXME: ObjC metadata is currently emitted as internal symbols that have - // \1L and \0l prefixes on them. Fix them to be Private/LinkerPrivate and - // this horrible hack can go away. - SmallString<64> Name; - Mang->getNameWithPrefix(Name, GV, false); - if (Name[0] == 'L' || Name[0] == 'l') - return false; +const MCExpr *TargetLoweringObjectFile:: +getSymbolForDwarfReference(const MCSymbol *Sym, MachineModuleInfo *MMI, + unsigned Encoding) const { + const MCExpr *Res = MCSymbolRefExpr::Create(Sym, getContext()); + + switch (Encoding & 0xF0) { + default: + llvm_report_error("We do not support this DWARF encoding yet!"); + break; + case dwarf::DW_EH_PE_absptr: + // Do nothing special + break; + case dwarf::DW_EH_PE_pcrel: + // FIXME: PCSymbol + const MCExpr *PC = MCSymbolRefExpr::Create(".", getContext()); + Res = MCBinaryExpr::CreateSub(Res, PC, getContext()); + break; } - return true; + return Res; } -const MCExpr *TargetLoweringObjectFileMachO:: -getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang, - MachineModuleInfo *MMI, - bool &IsIndirect, bool &IsPCRel) const { - // The mach-o version of this method defaults to returning a stub reference. - IsIndirect = true; - IsPCRel = false; - - SmallString<128> Name; - Mang->getNameWithPrefix(Name, GV, true); - Name += "$non_lazy_ptr"; - return MCSymbolRefExpr::Create(Name.str(), getContext()); +unsigned TargetLoweringObjectFile::getPersonalityEncoding() const { + return dwarf::DW_EH_PE_absptr; } - -//===----------------------------------------------------------------------===// -// COFF -//===----------------------------------------------------------------------===// - -typedef StringMap<const MCSectionCOFF*> COFFUniqueMapTy; - -TargetLoweringObjectFileCOFF::~TargetLoweringObjectFileCOFF() { - delete (COFFUniqueMapTy*)UniquingMap; +unsigned TargetLoweringObjectFile::getLSDAEncoding() const { + return dwarf::DW_EH_PE_absptr; } - -const MCSection *TargetLoweringObjectFileCOFF:: -getCOFFSection(StringRef Name, bool isDirective, SectionKind Kind) const { - // Create the map if it doesn't already exist. - if (UniquingMap == 0) - UniquingMap = new MachOUniqueMapTy(); - COFFUniqueMapTy &Map = *(COFFUniqueMapTy*)UniquingMap; - - // Do the lookup, if we have a hit, return it. - const MCSectionCOFF *&Entry = Map[Name]; - if (Entry) return Entry; - - return Entry = MCSectionCOFF::Create(Name, isDirective, Kind, getContext()); +unsigned TargetLoweringObjectFile::getFDEEncoding() const { + return dwarf::DW_EH_PE_absptr; } -void TargetLoweringObjectFileCOFF::Initialize(MCContext &Ctx, - const TargetMachine &TM) { - if (UniquingMap != 0) - ((COFFUniqueMapTy*)UniquingMap)->clear(); - TargetLoweringObjectFile::Initialize(Ctx, TM); - TextSection = getCOFFSection("\t.text", true, SectionKind::getText()); - DataSection = getCOFFSection("\t.data", true, SectionKind::getDataRel()); - StaticCtorSection = - getCOFFSection(".ctors", false, SectionKind::getDataRel()); - StaticDtorSection = - getCOFFSection(".dtors", false, SectionKind::getDataRel()); - - // FIXME: We're emitting LSDA info into a readonly section on COFF, even - // though it contains relocatable pointers. In PIC mode, this is probably a - // big runtime hit for C++ apps. Either the contents of the LSDA need to be - // adjusted or this should be a data section. - LSDASection = - getCOFFSection(".gcc_except_table", false, SectionKind::getReadOnly()); - EHFrameSection = - getCOFFSection(".eh_frame", false, SectionKind::getDataRel()); - - // Debug info. - // FIXME: Don't use 'directive' mode here. - DwarfAbbrevSection = - getCOFFSection("\t.section\t.debug_abbrev,\"dr\"", - true, SectionKind::getMetadata()); - DwarfInfoSection = - getCOFFSection("\t.section\t.debug_info,\"dr\"", - true, SectionKind::getMetadata()); - DwarfLineSection = - getCOFFSection("\t.section\t.debug_line,\"dr\"", - true, SectionKind::getMetadata()); - DwarfFrameSection = - getCOFFSection("\t.section\t.debug_frame,\"dr\"", - true, SectionKind::getMetadata()); - DwarfPubNamesSection = - getCOFFSection("\t.section\t.debug_pubnames,\"dr\"", - true, SectionKind::getMetadata()); - DwarfPubTypesSection = - getCOFFSection("\t.section\t.debug_pubtypes,\"dr\"", - true, SectionKind::getMetadata()); - DwarfStrSection = - getCOFFSection("\t.section\t.debug_str,\"dr\"", - true, SectionKind::getMetadata()); - DwarfLocSection = - getCOFFSection("\t.section\t.debug_loc,\"dr\"", - true, SectionKind::getMetadata()); - DwarfARangesSection = - getCOFFSection("\t.section\t.debug_aranges,\"dr\"", - true, SectionKind::getMetadata()); - DwarfRangesSection = - getCOFFSection("\t.section\t.debug_ranges,\"dr\"", - true, SectionKind::getMetadata()); - DwarfMacroInfoSection = - getCOFFSection("\t.section\t.debug_macinfo,\"dr\"", - true, SectionKind::getMetadata()); -} - -const MCSection *TargetLoweringObjectFileCOFF:: -getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind, - Mangler *Mang, const TargetMachine &TM) const { - return getCOFFSection(GV->getSection(), false, Kind); -} - -static const char *getCOFFSectionPrefixForUniqueGlobal(SectionKind Kind) { - if (Kind.isText()) - return ".text$linkonce"; - if (Kind.isWriteable()) - return ".data$linkonce"; - return ".rdata$linkonce"; -} - - -const MCSection *TargetLoweringObjectFileCOFF:: -SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind, - Mangler *Mang, const TargetMachine &TM) const { - assert(!Kind.isThreadLocal() && "Doesn't support TLS"); - - // If this global is linkonce/weak and the target handles this by emitting it - // into a 'uniqued' section name, create and return the section now. - if (GV->isWeakForLinker()) { - const char *Prefix = getCOFFSectionPrefixForUniqueGlobal(Kind); - SmallString<128> Name(Prefix, Prefix+strlen(Prefix)); - Mang->getNameWithPrefix(Name, GV, false); - return getCOFFSection(Name.str(), false, Kind); - } - - if (Kind.isText()) - return getTextSection(); - - return getDataSection(); +unsigned TargetLoweringObjectFile::getTTypeEncoding() const { + return dwarf::DW_EH_PE_absptr; } |