-
- return DataSection;
-}
-
-
-const MCSection *TargetLoweringObjectFile::
-getOrCreateSection(const char *Name, bool isDirective, SectionKind Kind) const {
- if (MCSection *S = Ctx->GetSection(Name))
- return S;
- return MCSection::Create(Name, isDirective, Kind, *Ctx);
-}
-
-
-
-//===----------------------------------------------------------------------===//
-// ELF
-//===----------------------------------------------------------------------===//
-
-void TargetLoweringObjectFileELF::Initialize(MCContext &Ctx,
- const TargetMachine &TM) {
- TargetLoweringObjectFile::Initialize(Ctx, TM);
- if (!HasCrazyBSS)
- BSSSection = getOrCreateSection("\t.bss", true, SectionKind::getBSS());
- else
- // PPC/Linux doesn't support the .bss directive, it needs .section .bss.
- // FIXME: Does .section .bss work everywhere??
- // FIXME2: this should just be handle by the section printer. We should get
- // away from syntactic view of the sections and MCSection should just be a
- // semantic view.
- BSSSection = getOrCreateSection("\t.bss", false, SectionKind::getBSS());
-
-
- TextSection = getOrCreateSection("\t.text", true, SectionKind::getText());
- DataSection = getOrCreateSection("\t.data", true, SectionKind::getDataRel());
- ReadOnlySection =
- getOrCreateSection("\t.rodata", false, SectionKind::getReadOnly());
- TLSDataSection =
- getOrCreateSection("\t.tdata", false, SectionKind::getThreadData());
-
- TLSBSSSection = getOrCreateSection("\t.tbss", false,
- SectionKind::getThreadBSS());
-
- DataRelSection = getOrCreateSection("\t.data.rel", false,
- SectionKind::getDataRel());
- DataRelLocalSection = getOrCreateSection("\t.data.rel.local", false,
- SectionKind::getDataRelLocal());
- DataRelROSection = getOrCreateSection("\t.data.rel.ro", false,
- SectionKind::getReadOnlyWithRel());
- DataRelROLocalSection =
- getOrCreateSection("\t.data.rel.ro.local", false,
- SectionKind::getReadOnlyWithRelLocal());
-
- MergeableConst4Section = getOrCreateSection(".rodata.cst4", false,
- SectionKind::getMergeableConst4());
- MergeableConst8Section = getOrCreateSection(".rodata.cst8", false,
- SectionKind::getMergeableConst8());
- MergeableConst16Section = getOrCreateSection(".rodata.cst16", false,
- SectionKind::getMergeableConst16());
-
- StaticCtorSection =
- getOrCreateSection(".ctors", false, SectionKind::getDataRel());
- StaticDtorSection =
- getOrCreateSection(".dtors", false, 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 =
- getOrCreateSection(".gcc_except_table", false, SectionKind::getReadOnly());
- EHFrameSection =
- getOrCreateSection(".eh_frame", false, SectionKind::getDataRel());
-
- // Debug Info Sections.
- DwarfAbbrevSection =
- getOrCreateSection(".debug_abbrev", false, SectionKind::getMetadata());
- DwarfInfoSection =
- getOrCreateSection(".debug_info", false, SectionKind::getMetadata());
- DwarfLineSection =
- getOrCreateSection(".debug_line", false, SectionKind::getMetadata());
- DwarfFrameSection =
- getOrCreateSection(".debug_frame", false, SectionKind::getMetadata());
- DwarfPubNamesSection =
- getOrCreateSection(".debug_pubnames", false, SectionKind::getMetadata());
- DwarfPubTypesSection =
- getOrCreateSection(".debug_pubtypes", false, SectionKind::getMetadata());
- DwarfStrSection =
- getOrCreateSection(".debug_str", false, SectionKind::getMetadata());
- DwarfLocSection =
- getOrCreateSection(".debug_loc", false, SectionKind::getMetadata());
- DwarfARangesSection =
- getOrCreateSection(".debug_aranges", false, SectionKind::getMetadata());
- DwarfRangesSection =
- getOrCreateSection(".debug_ranges", false, SectionKind::getMetadata());
- DwarfMacroInfoSection =
- getOrCreateSection(".debug_macinfo", false, SectionKind::getMetadata());
-}
-
-
-SectionKind TargetLoweringObjectFileELF::
-getKindForNamedSection(const char *Name, SectionKind K) const {
- if (Name[0] != '.') return K;
-
- // Some lame default implementation based on some magic section names.
- if (strncmp(Name, ".gnu.linkonce.b.", 16) == 0 ||
- strncmp(Name, ".llvm.linkonce.b.", 17) == 0 ||
- strncmp(Name, ".gnu.linkonce.sb.", 17) == 0 ||
- strncmp(Name, ".llvm.linkonce.sb.", 18) == 0)
- return SectionKind::getBSS();
-
- if (strcmp(Name, ".tdata") == 0 ||
- strncmp(Name, ".tdata.", 7) == 0 ||
- strncmp(Name, ".gnu.linkonce.td.", 17) == 0 ||
- strncmp(Name, ".llvm.linkonce.td.", 18) == 0)
- return SectionKind::getThreadData();
-
- if (strcmp(Name, ".tbss") == 0 ||
- strncmp(Name, ".tbss.", 6) == 0 ||
- strncmp(Name, ".gnu.linkonce.tb.", 17) == 0 ||
- strncmp(Name, ".llvm.linkonce.tb.", 18) == 0)
- return SectionKind::getThreadBSS();
-
- return K;
-}
-
-void TargetLoweringObjectFileELF::
-getSectionFlagsAsString(SectionKind Kind, SmallVectorImpl<char> &Str) const {
- Str.push_back(',');
- Str.push_back('"');
-
- if (!Kind.isMetadata())
- Str.push_back('a');
- if (Kind.isText())
- Str.push_back('x');
- if (Kind.isWriteable())
- Str.push_back('w');
- if (Kind.isMergeable1ByteCString() ||
- Kind.isMergeable2ByteCString() ||
- Kind.isMergeable4ByteCString() ||
- Kind.isMergeableConst4() ||
- Kind.isMergeableConst8() ||
- Kind.isMergeableConst16())
- Str.push_back('M');
- if (Kind.isMergeable1ByteCString() ||
- Kind.isMergeable2ByteCString() ||
- Kind.isMergeable4ByteCString())
- Str.push_back('S');
- if (Kind.isThreadLocal())
- Str.push_back('T');
-
- Str.push_back('"');
- Str.push_back(',');
-
- // If comment string is '@', e.g. as on ARM - use '%' instead
- if (AtIsCommentChar)
- Str.push_back('%');
- else
- Str.push_back('@');
-
- const char *KindStr;
- if (Kind.isBSS() || Kind.isThreadBSS())
- KindStr = "nobits";
- else
- KindStr = "progbits";
-
- Str.append(KindStr, KindStr+strlen(KindStr));
-
- if (Kind.isMergeable1ByteCString()) {
- Str.push_back(',');
- Str.push_back('1');
- } else if (Kind.isMergeable2ByteCString()) {
- Str.push_back(',');
- Str.push_back('2');
- } else if (Kind.isMergeable4ByteCString()) {
- Str.push_back(',');
- Str.push_back('4');
- } else if (Kind.isMergeableConst4()) {
- Str.push_back(',');
- Str.push_back('4');
- } else if (Kind.isMergeableConst8()) {
- Str.push_back(',');
- Str.push_back('8');
- } else if (Kind.isMergeableConst16()) {
- Str.push_back(',');
- Str.push_back('1');
- Str.push_back('6');
- }
-}
-
-
-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.isBSS()) return ".gnu.linkonce.b.";
- 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.";
-}
-
-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()) {
- const char *Prefix = getSectionPrefixForUniqueGlobal(Kind);
- std::string Name = Mang->makeNameProper(GV->getNameStr());
- return getOrCreateSection((Prefix+Name).c_str(), false, 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 getOrCreateSection(Name.c_str(), false, Kind);
- }
-
- if (Kind.isMergeableConst()) {
- if (Kind.isMergeableConst4())
- return MergeableConst4Section;
- if (Kind.isMergeableConst8())
- return MergeableConst8Section;
- if (Kind.isMergeableConst16())
- return MergeableConst16Section;
- return ReadOnlySection; // .const
- }
-
- if (Kind.isReadOnly()) return ReadOnlySection;
-
- if (Kind.isThreadData()) return TLSDataSection;
- if (Kind.isThreadBSS()) return TLSBSSSection;
-
- if (Kind.isBSS()) 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())
- return MergeableConst4Section;
- if (Kind.isMergeableConst8())
- return MergeableConst8Section;
- if (Kind.isMergeableConst16())
- return MergeableConst16Section;
- if (Kind.isReadOnly())
- return ReadOnlySection;
-
- if (Kind.isReadOnlyWithRelLocal()) return DataRelROLocalSection;
- assert(Kind.isReadOnlyWithRel() && "Unknown section kind");
- return DataRelROSection;
-}
-
-//===----------------------------------------------------------------------===//
-// MachO
-//===----------------------------------------------------------------------===//