-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());
- CStringSection = getOrCreateSection("\t.rodata.str", true,
- SectionKind::getMergeableCString());
-
- 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());
-}
-
-
-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.isMergeableCString() ||
- Kind.isMergeableConst4() ||
- Kind.isMergeableConst8() ||
- Kind.isMergeableConst16())
- Str.push_back('M');
- if (Kind.isMergeableCString())
- 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.isMergeableCString()) {
- // TODO: Eventually handle multiple byte character strings. For now, all
- // mergable C strings are single byte.
- Str.push_back(',');
- Str.push_back('1');
- } 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.isMergeableCString()) {
- assert(CStringSection && "Should have string section prefix");
-
- // 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));
-
- std::string Name = CStringSection->getName() + "1." + utostr(Align);
- return getOrCreateSection(Name.c_str(), false,
- SectionKind::getMergeableCString());
- }
-
- 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
-//===----------------------------------------------------------------------===//
-
-void TargetLoweringObjectFileMachO::Initialize(MCContext &Ctx,
- const TargetMachine &TM) {
- TargetLoweringObjectFile::Initialize(Ctx, TM);
- TextSection = getOrCreateSection("\t.text", true,
- SectionKind::getText());
- DataSection = getOrCreateSection("\t.data", true,
- SectionKind::getDataRel());
-
- CStringSection = getOrCreateSection("\t.cstring", true,
- SectionKind::getMergeableCString());
- FourByteConstantSection = getOrCreateSection("\t.literal4\n", true,
- SectionKind::getMergeableConst4());
- EightByteConstantSection = getOrCreateSection("\t.literal8\n", true,
- SectionKind::getMergeableConst8());
-
- // ld_classic doesn't support .literal16 in 32-bit mode, and ld64 falls back
- // to using it in -static mode.
- if (TM.getRelocationModel() != Reloc::Static &&
- TM.getTargetData()->getPointerSize() == 32)
- SixteenByteConstantSection =
- getOrCreateSection("\t.literal16\n", true,
- SectionKind::getMergeableConst16());
- else
- SixteenByteConstantSection = 0;
-
- ReadOnlySection = getOrCreateSection("\t.const", true,
- SectionKind::getReadOnly());
-
- TextCoalSection =
- getOrCreateSection("\t__TEXT,__textcoal_nt,coalesced,pure_instructions",
- false, SectionKind::getText());
- ConstTextCoalSection = getOrCreateSection("\t__TEXT,__const_coal,coalesced",
- false,
- SectionKind::getText());
- ConstDataCoalSection = getOrCreateSection("\t__DATA,__const_coal,coalesced",
- false,
- SectionKind::getText());
- ConstDataSection = getOrCreateSection("\t.const_data", true,
- SectionKind::getReadOnlyWithRel());
- DataCoalSection = getOrCreateSection("\t__DATA,__datacoal_nt,coalesced",
- false,
- SectionKind::getDataRel());
-}
-
-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.isMergeableCString()) {
- Constant *C = cast<GlobalVariable>(GV)->getInitializer();
- const Type *Ty = cast<ArrayType>(C->getType())->getElementType();
- const TargetData &TD = *TM.getTargetData();
- unsigned Size = TD.getTypeAllocSize(Ty);
- if (Size) {
- unsigned Align = TD.getPreferredAlignment(cast<GlobalVariable>(GV));
- if (Align <= 32)
- return CStringSection;
- }
-
- return ReadOnlySection;
- }
-
- if (Kind.isMergeableConst()) {
- if (Kind.isMergeableConst4())
- return FourByteConstantSection;
- if (Kind.isMergeableConst8())
- return EightByteConstantSection;
- if (Kind.isMergeableConst16() && SixteenByteConstantSection)
- return SixteenByteConstantSection;
- return ReadOnlySection; // .const
- }
-
- // FIXME: ROData -> const in -static mode that is relocatable but they happen
- // by the static linker. Why not mergeable?
- 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;
-
- // Otherwise, just drop the variable in the normal data section.