#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalVariable.h"
+#include "llvm/IR/Mangler.h"
#include "llvm/IR/Module.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MCValue.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/ELF.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
-#include "llvm/Target/Mangler.h"
+#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetSubtargetInfo.h"
using namespace llvm;
using namespace dwarf;
// ELF
//===----------------------------------------------------------------------===//
-MCSymbol *
-TargetLoweringObjectFileELF::getCFIPersonalitySymbol(const GlobalValue *GV,
- Mangler *Mang,
- MachineModuleInfo *MMI) const {
+MCSymbol *TargetLoweringObjectFileELF::getCFIPersonalitySymbol(
+ const GlobalValue *GV, Mangler &Mang, const TargetMachine &TM,
+ MachineModuleInfo *MMI) const {
unsigned Encoding = getPersonalityEncoding();
- switch (Encoding & 0x70) {
- default:
- report_fatal_error("We do not support this DWARF encoding yet!");
- case dwarf::DW_EH_PE_absptr:
- return getSymbol(*Mang, GV);
- case dwarf::DW_EH_PE_pcrel: {
- return getContext().GetOrCreateSymbol(StringRef("DW.ref.") +
- getSymbol(*Mang, GV)->getName());
- }
- }
+ if ((Encoding & 0x80) == dwarf::DW_EH_PE_indirect)
+ return getContext().getOrCreateSymbol(StringRef("DW.ref.") +
+ TM.getSymbol(GV, Mang)->getName());
+ if ((Encoding & 0x70) == dwarf::DW_EH_PE_absptr)
+ return TM.getSymbol(GV, Mang);
+ report_fatal_error("We do not support this DWARF encoding yet!");
}
void TargetLoweringObjectFileELF::emitPersonalityValue(MCStreamer &Streamer,
const MCSymbol *Sym) const {
SmallString<64> NameData("DW.ref.");
NameData += Sym->getName();
- MCSymbol *Label = getContext().GetOrCreateSymbol(NameData);
+ MCSymbol *Label = getContext().getOrCreateSymbol(NameData);
Streamer.EmitSymbolAttribute(Label, MCSA_Hidden);
Streamer.EmitSymbolAttribute(Label, MCSA_Weak);
StringRef Prefix = ".data.";
const MCSection *Sec = getContext().getELFSection(NameData,
ELF::SHT_PROGBITS,
Flags,
- SectionKind::getDataRel(),
0, Label->getName());
unsigned Size = TM.getDataLayout()->getPointerSize();
Streamer.SwitchSection(Sec);
Streamer.EmitSymbolValue(Sym, Size);
}
-const MCExpr *TargetLoweringObjectFileELF::
-getTTypeGlobalReference(const GlobalValue *GV, Mangler *Mang,
- MachineModuleInfo *MMI, unsigned Encoding,
- MCStreamer &Streamer) const {
+const MCExpr *TargetLoweringObjectFileELF::getTTypeGlobalReference(
+ const GlobalValue *GV, unsigned Encoding, Mangler &Mang,
+ const TargetMachine &TM, MachineModuleInfo *MMI,
+ MCStreamer &Streamer) const {
if (Encoding & dwarf::DW_EH_PE_indirect) {
MachineModuleInfoELF &ELFMMI = MMI->getObjFileInfo<MachineModuleInfoELF>();
- SmallString<128> Name;
- Mang->getNameWithPrefix(Name, GV, true);
- Name += ".DW.stub";
+ MCSymbol *SSym = getSymbolWithGlobalValueBase(GV, ".DW.stub", Mang, TM);
// Add information about the stub reference to ELFMMI so that the stub
// gets emitted by the asmprinter.
- MCSymbol *SSym = getContext().GetOrCreateSymbol(Name.str());
MachineModuleInfoImpl::StubValueTy &StubSym = ELFMMI.getGVStubEntry(SSym);
- if (StubSym.getPointer() == 0) {
- MCSymbol *Sym = getSymbol(*Mang, GV);
+ if (!StubSym.getPointer()) {
+ MCSymbol *Sym = TM.getSymbol(GV, Mang);
StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage());
}
}
return TargetLoweringObjectFile::
- getTTypeGlobalReference(GV, Mang, MMI, Encoding, Streamer);
+ getTTypeGlobalReference(GV, Encoding, Mang, TM, MMI, Streamer);
}
static SectionKind
return ELF::SHT_PROGBITS;
}
-
-static unsigned
-getELFSectionFlags(SectionKind K) {
+static unsigned getELFSectionFlags(SectionKind K) {
unsigned Flags = 0;
if (!K.isMetadata())
if (K.isThreadLocal())
Flags |= ELF::SHF_TLS;
- // K.isMergeableConst() is left out to honour PR4650
- if (K.isMergeableCString() || K.isMergeableConst4() ||
- K.isMergeableConst8() || K.isMergeableConst16())
+ if (K.isMergeableCString() || K.isMergeableConst())
Flags |= ELF::SHF_MERGE;
if (K.isMergeableCString())
return Flags;
}
+static const Comdat *getELFComdat(const GlobalValue *GV) {
+ const Comdat *C = GV->getComdat();
+ if (!C)
+ return nullptr;
+
+ if (C->getSelectionKind() != Comdat::Any)
+ report_fatal_error("ELF COMDATs only support SelectionKind::Any, '" +
+ C->getName() + "' cannot be lowered.");
-const MCSection *TargetLoweringObjectFileELF::
-getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
- Mangler *Mang, const TargetMachine &TM) const {
+ return C;
+}
+
+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);
+ StringRef Group = "";
+ unsigned Flags = getELFSectionFlags(Kind);
+ if (const Comdat *C = getELFComdat(GV)) {
+ Group = C->getName();
+ Flags |= ELF::SHF_GROUP;
+ }
return getContext().getELFSection(SectionName,
- getELFSectionType(SectionName, Kind),
- getELFSectionFlags(Kind), Kind);
+ getELFSectionType(SectionName, Kind), Flags,
+ /*EntrySize=*/0, Group);
}
-/// getSectionPrefixForGlobal - Return the section prefix name used by options
-/// FunctionsSections and DataSections.
-static const char *getSectionPrefixForGlobal(SectionKind Kind) {
- if (Kind.isText()) return ".text.";
- if (Kind.isReadOnly()) return ".rodata.";
- if (Kind.isBSS()) return ".bss.";
-
- if (Kind.isThreadData()) return ".tdata.";
- if (Kind.isThreadBSS()) return ".tbss.";
-
- if (Kind.isDataNoRel()) return ".data.";
- if (Kind.isDataRelLocal()) return ".data.rel.local.";
- if (Kind.isDataRel()) return ".data.rel.";
- if (Kind.isReadOnlyWithRelLocal()) return ".data.rel.ro.local.";
-
+/// Return the section prefix name used by options FunctionsSections and
+/// DataSections.
+static StringRef getSectionPrefixForGlobal(SectionKind Kind) {
+ if (Kind.isText())
+ return ".text";
+ if (Kind.isReadOnly())
+ return ".rodata";
+ if (Kind.isBSS())
+ return ".bss";
+ if (Kind.isThreadData())
+ return ".tdata";
+ if (Kind.isThreadBSS())
+ return ".tbss";
+ if (Kind.isDataNoRel())
+ return ".data";
+ if (Kind.isDataRelLocal())
+ return ".data.rel.local";
+ if (Kind.isDataRel())
+ return ".data.rel";
+ if (Kind.isReadOnlyWithRelLocal())
+ return ".data.rel.ro.local";
assert(Kind.isReadOnlyWithRel() && "Unknown section kind");
- return ".data.rel.ro.";
+ return ".data.rel.ro";
}
-
-const MCSection *TargetLoweringObjectFileELF::
-SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
- Mangler *Mang, const TargetMachine &TM) const {
- // If we have -ffunction-section or -fdata-section then we should emit the
- // global value to a uniqued section specifically for it.
- bool EmitUniquedSection;
- if (Kind.isText())
- EmitUniquedSection = TM.getFunctionSections();
- else
- EmitUniquedSection = TM.getDataSections();
-
- // 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() || EmitUniquedSection) &&
- !Kind.isCommon()) {
- const char *Prefix;
- Prefix = getSectionPrefixForGlobal(Kind);
-
- SmallString<128> Name(Prefix, Prefix+strlen(Prefix));
- MCSymbol *Sym = getSymbol(*Mang, GV);
- Name.append(Sym->getName().begin(), Sym->getName().end());
- StringRef Group = "";
- unsigned Flags = getELFSectionFlags(Kind);
- if (GV->isWeakForLinker()) {
- Group = Sym->getName();
- Flags |= ELF::SHF_GROUP;
+static const MCSectionELF *
+selectELFSectionForGlobal(MCContext &Ctx, const GlobalValue *GV,
+ SectionKind Kind, Mangler &Mang,
+ const TargetMachine &TM, bool EmitUniqueSection,
+ unsigned Flags, unsigned *NextUniqueID) {
+ unsigned EntrySize = 0;
+ if (Kind.isMergeableCString()) {
+ if (Kind.isMergeable2ByteCString()) {
+ EntrySize = 2;
+ } else if (Kind.isMergeable4ByteCString()) {
+ EntrySize = 4;
+ } else {
+ EntrySize = 1;
+ assert(Kind.isMergeable1ByteCString() && "unknown string width");
+ }
+ } else if (Kind.isMergeableConst()) {
+ if (Kind.isMergeableConst4()) {
+ EntrySize = 4;
+ } else if (Kind.isMergeableConst8()) {
+ EntrySize = 8;
+ } else {
+ assert(Kind.isMergeableConst16() && "unknown data width");
+ EntrySize = 16;
}
-
- return getContext().getELFSection(Name.str(),
- getELFSectionType(Name.str(), Kind),
- Flags, Kind, 0, Group);
}
- if (Kind.isText()) return TextSection;
-
- if (Kind.isMergeable1ByteCString() ||
- Kind.isMergeable2ByteCString() ||
- Kind.isMergeable4ByteCString()) {
+ StringRef Group = "";
+ if (const Comdat *C = getELFComdat(GV)) {
+ Flags |= ELF::SHF_GROUP;
+ Group = C->getName();
+ }
+ bool UniqueSectionNames = TM.getUniqueSectionNames();
+ SmallString<128> Name;
+ if (Kind.isMergeableCString()) {
// We also need alignment here.
// FIXME: this is getting the alignment of the character, not the
// alignment of the global!
unsigned Align =
- TM.getDataLayout()->getPreferredAlignment(cast<GlobalVariable>(GV));
+ TM.getDataLayout()->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 getContext().getELFSection(Name, ELF::SHT_PROGBITS,
- ELF::SHF_ALLOC |
- ELF::SHF_MERGE |
- ELF::SHF_STRINGS,
- Kind);
+ std::string SizeSpec = ".rodata.str" + utostr(EntrySize) + ".";
+ Name = SizeSpec + utostr(Align);
+ } else if (Kind.isMergeableConst()) {
+ Name = ".rodata.cst";
+ Name += utostr(EntrySize);
+ } else {
+ Name = getSectionPrefixForGlobal(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 (EmitUniqueSection && UniqueSectionNames) {
+ Name.push_back('.');
+ TM.getNameWithPrefix(Name, GV, Mang, true);
}
+ unsigned UniqueID = ~0;
+ if (EmitUniqueSection && !UniqueSectionNames) {
+ UniqueID = *NextUniqueID;
+ (*NextUniqueID)++;
+ }
+ return Ctx.getELFSection(Name, getELFSectionType(Name, Kind), Flags,
+ EntrySize, Group, UniqueID);
+}
- if (Kind.isReadOnly()) return ReadOnlySection;
+const MCSection *TargetLoweringObjectFileELF::SelectSectionForGlobal(
+ const GlobalValue *GV, SectionKind Kind, Mangler &Mang,
+ const TargetMachine &TM) const {
+ unsigned Flags = getELFSectionFlags(Kind);
+
+ // If we have -ffunction-section or -fdata-section then we should emit the
+ // global value to a uniqued section specifically for it.
+ bool EmitUniqueSection = false;
+ if (!(Flags & ELF::SHF_MERGE) && !Kind.isCommon()) {
+ if (Kind.isText())
+ EmitUniqueSection = TM.getFunctionSections();
+ else
+ EmitUniqueSection = TM.getDataSections();
+ }
+ EmitUniqueSection |= GV->hasComdat();
- if (Kind.isThreadData()) return TLSDataSection;
- if (Kind.isThreadBSS()) return TLSBSSSection;
+ return selectELFSectionForGlobal(getContext(), GV, Kind, Mang, TM,
+ EmitUniqueSection, Flags, &NextUniqueID);
+}
- // 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;
+const MCSection *TargetLoweringObjectFileELF::getSectionForJumpTable(
+ const Function &F, Mangler &Mang, const TargetMachine &TM) const {
+ // If the function can be removed, produce a unique section so that
+ // the table doesn't prevent the removal.
+ const Comdat *C = F.getComdat();
+ bool EmitUniqueSection = TM.getFunctionSections() || C;
+ if (!EmitUniqueSection)
+ return ReadOnlySection;
- if (Kind.isDataNoRel()) return DataSection;
- if (Kind.isDataRelLocal()) return DataRelLocalSection;
- if (Kind.isDataRel()) return DataRelSection;
- if (Kind.isReadOnlyWithRelLocal()) return DataRelROLocalSection;
+ return selectELFSectionForGlobal(getContext(), &F, SectionKind::getReadOnly(),
+ Mang, TM, EmitUniqueSection, ELF::SHF_ALLOC,
+ &NextUniqueID);
+}
- assert(Kind.isReadOnlyWithRel() && "Unknown section kind");
- return DataRelROSection;
+bool TargetLoweringObjectFileELF::shouldPutJumpTableInFunctionSection(
+ bool UsesLabelDifference, const Function &F) const {
+ // We can always create relative relocations, so use another section
+ // that can be marked non-executable.
+ return false;
}
/// 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 {
+const MCSection *
+TargetLoweringObjectFileELF::getSectionForConstant(SectionKind Kind,
+ const Constant *C) const {
if (Kind.isMergeableConst4() && MergeableConst4Section)
return MergeableConst4Section;
if (Kind.isMergeableConst8() && MergeableConst8Section)
return DataRelROSection;
}
-const MCSection *
-TargetLoweringObjectFileELF::getStaticCtorSection(unsigned Priority) const {
- // The default scheme is .ctor / .dtor, so we have to invert the priority
- // numbering.
- if (Priority == 65535)
- return StaticCtorSection;
+static const MCSectionELF *getStaticStructorSection(MCContext &Ctx,
+ bool UseInitArray,
+ bool IsCtor,
+ unsigned Priority,
+ const MCSymbol *KeySym) {
+ std::string Name;
+ unsigned Type;
+ unsigned Flags = ELF::SHF_ALLOC | ELF::SHF_WRITE;
+ StringRef COMDAT = KeySym ? KeySym->getName() : "";
+
+ if (KeySym)
+ Flags |= ELF::SHF_GROUP;
if (UseInitArray) {
- std::string Name = std::string(".init_array.") + utostr(Priority);
- return getContext().getELFSection(Name, ELF::SHT_INIT_ARRAY,
- ELF::SHF_ALLOC | ELF::SHF_WRITE,
- SectionKind::getDataRel());
+ if (IsCtor) {
+ Type = ELF::SHT_INIT_ARRAY;
+ Name = ".init_array";
+ } else {
+ Type = ELF::SHT_FINI_ARRAY;
+ Name = ".fini_array";
+ }
+ if (Priority != 65535) {
+ Name += '.';
+ Name += utostr(Priority);
+ }
} else {
- std::string Name = std::string(".ctors.") + utostr(65535 - Priority);
- return getContext().getELFSection(Name, ELF::SHT_PROGBITS,
- ELF::SHF_ALLOC |ELF::SHF_WRITE,
- SectionKind::getDataRel());
+ // The default scheme is .ctor / .dtor, so we have to invert the priority
+ // numbering.
+ if (IsCtor)
+ Name = ".ctors";
+ else
+ Name = ".dtors";
+ if (Priority != 65535) {
+ Name += '.';
+ Name += utostr(65535 - Priority);
+ }
+ Type = ELF::SHT_PROGBITS;
}
+
+ return Ctx.getELFSection(Name, Type, Flags, 0, COMDAT);
}
-const MCSection *
-TargetLoweringObjectFileELF::getStaticDtorSection(unsigned Priority) const {
- // The default scheme is .ctor / .dtor, so we have to invert the priority
- // numbering.
- if (Priority == 65535)
- return StaticDtorSection;
+const MCSection *TargetLoweringObjectFileELF::getStaticCtorSection(
+ unsigned Priority, const MCSymbol *KeySym) const {
+ return getStaticStructorSection(getContext(), UseInitArray, true, Priority,
+ KeySym);
+}
- if (UseInitArray) {
- std::string Name = std::string(".fini_array.") + utostr(Priority);
- return getContext().getELFSection(Name, ELF::SHT_FINI_ARRAY,
- ELF::SHF_ALLOC | ELF::SHF_WRITE,
- SectionKind::getDataRel());
- } else {
- std::string Name = std::string(".dtors.") + utostr(65535 - Priority);
- return getContext().getELFSection(Name, ELF::SHT_PROGBITS,
- ELF::SHF_ALLOC |ELF::SHF_WRITE,
- SectionKind::getDataRel());
- }
+const MCSection *TargetLoweringObjectFileELF::getStaticDtorSection(
+ unsigned Priority, const MCSymbol *KeySym) const {
+ return getStaticStructorSection(getContext(), UseInitArray, false, Priority,
+ KeySym);
}
void
if (!UseInitArray)
return;
- StaticCtorSection =
- getContext().getELFSection(".init_array", ELF::SHT_INIT_ARRAY,
- ELF::SHF_WRITE |
- ELF::SHF_ALLOC,
- SectionKind::getDataRel());
- StaticDtorSection =
- getContext().getELFSection(".fini_array", ELF::SHT_FINI_ARRAY,
- ELF::SHF_WRITE |
- ELF::SHF_ALLOC,
- SectionKind::getDataRel());
+ StaticCtorSection = getContext().getELFSection(
+ ".init_array", ELF::SHT_INIT_ARRAY, ELF::SHF_WRITE | ELF::SHF_ALLOC);
+ StaticDtorSection = getContext().getELFSection(
+ ".fini_array", ELF::SHT_FINI_ARRAY, ELF::SHF_WRITE | ELF::SHF_ALLOC);
}
//===----------------------------------------------------------------------===//
// MachO
//===----------------------------------------------------------------------===//
+TargetLoweringObjectFileMachO::TargetLoweringObjectFileMachO()
+ : TargetLoweringObjectFile() {
+ SupportIndirectSymViaGOTPCRel = true;
+}
+
+/// getDepLibFromLinkerOpt - Extract the dependent library name from a linker
+/// option string. Returns StringRef() if the option does not specify a library.
+StringRef TargetLoweringObjectFileMachO::
+getDepLibFromLinkerOpt(StringRef LinkerOption) const {
+ const char *LibCmd = "-l";
+ if (LinkerOption.startswith(LibCmd))
+ return LinkerOption.substr(strlen(LibCmd));
+ return StringRef();
+}
+
/// emitModuleFlags - Perform code emission for module flags.
void TargetLoweringObjectFileMachO::
emitModuleFlags(MCStreamer &Streamer,
ArrayRef<Module::ModuleFlagEntry> ModuleFlags,
- Mangler *Mang, const TargetMachine &TM) const {
+ Mangler &Mang, const TargetMachine &TM) const {
unsigned VersionVal = 0;
unsigned ImageInfoFlags = 0;
- MDNode *LinkerOptions = 0;
+ MDNode *LinkerOptions = nullptr;
StringRef SectionVal;
for (ArrayRef<Module::ModuleFlagEntry>::iterator
continue;
StringRef Key = MFE.Key->getString();
- Value *Val = MFE.Val;
+ Metadata *Val = MFE.Val;
if (Key == "Objective-C Image Info Version") {
- VersionVal = cast<ConstantInt>(Val)->getZExtValue();
+ VersionVal = mdconst::extract<ConstantInt>(Val)->getZExtValue();
} else if (Key == "Objective-C Garbage Collection" ||
Key == "Objective-C GC Only" ||
- Key == "Objective-C Is Simulated") {
- ImageInfoFlags |= cast<ConstantInt>(Val)->getZExtValue();
+ Key == "Objective-C Is Simulated" ||
+ Key == "Objective-C Image Swift Version") {
+ ImageInfoFlags |= mdconst::extract<ConstantInt>(Val)->getZExtValue();
} else if (Key == "Objective-C Image Info Section") {
SectionVal = cast<MDString>(Val)->getString();
} else if (Key == "Linker Options") {
SectionKind::getDataNoRel());
Streamer.SwitchSection(S);
Streamer.EmitLabel(getContext().
- GetOrCreateSymbol(StringRef("L_OBJC_IMAGE_INFO")));
+ getOrCreateSymbol(StringRef("L_OBJC_IMAGE_INFO")));
Streamer.EmitIntValue(VersionVal, 4);
Streamer.EmitIntValue(ImageInfoFlags, 4);
Streamer.AddBlankLine();
}
-const MCSection *TargetLoweringObjectFileMachO::
-getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
- Mangler *Mang, const TargetMachine &TM) const {
+static void checkMachOComdat(const GlobalValue *GV) {
+ const Comdat *C = GV->getComdat();
+ if (!C)
+ return;
+
+ report_fatal_error("MachO doesn't support COMDATs, '" + C->getName() +
+ "' cannot be lowered.");
+}
+
+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 = 0, StubSize = 0;
bool TAAParsed;
+
+ checkMachOComdat(GV);
+
std::string ErrorCode =
MCSectionMachO::ParseSectionSpecifier(GV->getSection(), Segment, Section,
TAA, TAAParsed, StubSize);
const MCSection *TargetLoweringObjectFileMachO::
SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
- Mangler *Mang, const TargetMachine &TM) const {
+ Mangler &Mang, const TargetMachine &TM) const {
+ checkMachOComdat(GV);
+
+ // Handle thread local data.
+ if (Kind.isThreadBSS()) return TLSBSSSection;
+ if (Kind.isThreadData()) return TLSDataSection;
+
if (Kind.isText())
return GV->isWeakForLinker() ? TextCoalSection : TextSection;
TM.getDataLayout()->getPreferredAlignment(cast<GlobalVariable>(GV)) < 32)
return UStringSection;
- if (Kind.isMergeableConst()) {
+ // With MachO only variables whose corresponding symbol starts with 'l' or
+ // 'L' can be merged, so we only try merging GVs with private linkage.
+ if (GV->hasPrivateLinkage() && Kind.isMergeableConst()) {
if (Kind.isMergeableConst4())
return FourByteConstantSection;
if (Kind.isMergeableConst8())
return EightByteConstantSection;
- if (Kind.isMergeableConst16() && SixteenByteConstantSection)
+ if (Kind.isMergeableConst16())
return SixteenByteConstantSection;
}
if (Kind.isBSSLocal())
return DataBSSSection;
- // Handle thread local data.
- if (Kind.isThreadBSS()) return TLSBSSSection;
- if (Kind.isThreadData()) return TLSDataSection;
-
// Otherwise, just drop the variable in the normal data section.
return DataSection;
}
const MCSection *
-TargetLoweringObjectFileMachO::getSectionForConstant(SectionKind Kind) const {
+TargetLoweringObjectFileMachO::getSectionForConstant(SectionKind Kind,
+ const Constant *C) 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 FourByteConstantSection;
if (Kind.isMergeableConst8())
return EightByteConstantSection;
- if (Kind.isMergeableConst16() && SixteenByteConstantSection)
+ if (Kind.isMergeableConst16())
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.
- MCSymbol *Sym = getSymbol(*Mang, GV);
- if (Sym->getName()[0] == 'L' || Sym->getName()[0] == 'l')
- return false;
- }
-
- return true;
-}
-
-const MCExpr *TargetLoweringObjectFileMachO::
-getTTypeGlobalReference(const GlobalValue *GV, Mangler *Mang,
- MachineModuleInfo *MMI, unsigned Encoding,
- MCStreamer &Streamer) const {
+const MCExpr *TargetLoweringObjectFileMachO::getTTypeGlobalReference(
+ const GlobalValue *GV, unsigned Encoding, Mangler &Mang,
+ const TargetMachine &TM, MachineModuleInfo *MMI,
+ MCStreamer &Streamer) const {
// The mach-o version of this method defaults to returning a stub reference.
if (Encoding & DW_EH_PE_indirect) {
MachineModuleInfoMachO &MachOMMI =
MMI->getObjFileInfo<MachineModuleInfoMachO>();
- SmallString<128> Name;
- Mang->getNameWithPrefix(Name, GV, true);
- Name += "$non_lazy_ptr";
+ MCSymbol *SSym =
+ getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr", Mang, TM);
// Add information about the stub reference to MachOMMI so that the stub
// gets emitted by the asmprinter.
- MCSymbol *SSym = getContext().GetOrCreateSymbol(Name.str());
MachineModuleInfoImpl::StubValueTy &StubSym =
GV->hasHiddenVisibility() ? MachOMMI.getHiddenGVStubEntry(SSym) :
MachOMMI.getGVStubEntry(SSym);
- if (StubSym.getPointer() == 0) {
- MCSymbol *Sym = getSymbol(*Mang, GV);
+ if (!StubSym.getPointer()) {
+ MCSymbol *Sym = TM.getSymbol(GV, Mang);
StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage());
}
Encoding & ~dwarf::DW_EH_PE_indirect, Streamer);
}
- return TargetLoweringObjectFile::
- getTTypeGlobalReference(GV, Mang, MMI, Encoding, Streamer);
+ return TargetLoweringObjectFile::getTTypeGlobalReference(GV, Encoding, Mang,
+ TM, MMI, Streamer);
}
-MCSymbol *TargetLoweringObjectFileMachO::
-getCFIPersonalitySymbol(const GlobalValue *GV, Mangler *Mang,
- MachineModuleInfo *MMI) const {
+MCSymbol *TargetLoweringObjectFileMachO::getCFIPersonalitySymbol(
+ const GlobalValue *GV, Mangler &Mang, const TargetMachine &TM,
+ MachineModuleInfo *MMI) const {
// The mach-o version of this method defaults to returning a stub reference.
MachineModuleInfoMachO &MachOMMI =
MMI->getObjFileInfo<MachineModuleInfoMachO>();
- SmallString<128> Name;
- Mang->getNameWithPrefix(Name, GV, true);
- Name += "$non_lazy_ptr";
+ MCSymbol *SSym = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr", Mang, TM);
// Add information about the stub reference to MachOMMI so that the stub
// gets emitted by the asmprinter.
- MCSymbol *SSym = getContext().GetOrCreateSymbol(Name.str());
MachineModuleInfoImpl::StubValueTy &StubSym = MachOMMI.getGVStubEntry(SSym);
- if (StubSym.getPointer() == 0) {
- MCSymbol *Sym = getSymbol(*Mang, GV);
+ if (!StubSym.getPointer()) {
+ MCSymbol *Sym = TM.getSymbol(GV, Mang);
StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage());
}
return SSym;
}
+const MCExpr *TargetLoweringObjectFileMachO::getIndirectSymViaGOTPCRel(
+ const MCSymbol *Sym, const MCValue &MV, int64_t Offset,
+ MachineModuleInfo *MMI, MCStreamer &Streamer) const {
+ // Although MachO 32-bit targets do not explictly have a GOTPCREL relocation
+ // as 64-bit do, we replace the GOT equivalent by accessing the final symbol
+ // through a non_lazy_ptr stub instead. One advantage is that it allows the
+ // computation of deltas to final external symbols. Example:
+ //
+ // _extgotequiv:
+ // .long _extfoo
+ //
+ // _delta:
+ // .long _extgotequiv-_delta
+ //
+ // is transformed to:
+ //
+ // _delta:
+ // .long L_extfoo$non_lazy_ptr-(_delta+0)
+ //
+ // .section __IMPORT,__pointers,non_lazy_symbol_pointers
+ // L_extfoo$non_lazy_ptr:
+ // .indirect_symbol _extfoo
+ // .long 0
+ //
+ MachineModuleInfoMachO &MachOMMI =
+ MMI->getObjFileInfo<MachineModuleInfoMachO>();
+ MCContext &Ctx = getContext();
+
+ // The offset must consider the original displacement from the base symbol
+ // since 32-bit targets don't have a GOTPCREL to fold the PC displacement.
+ Offset = -MV.getConstant();
+ const MCSymbol *BaseSym = &MV.getSymB()->getSymbol();
+
+ // Access the final symbol via sym$non_lazy_ptr and generate the appropriated
+ // non_lazy_ptr stubs.
+ SmallString<128> Name;
+ StringRef Suffix = "$non_lazy_ptr";
+ Name += DL->getPrivateGlobalPrefix();
+ Name += Sym->getName();
+ Name += Suffix;
+ MCSymbol *Stub = Ctx.getOrCreateSymbol(Name);
+
+ MachineModuleInfoImpl::StubValueTy &StubSym = MachOMMI.getGVStubEntry(Stub);
+ if (!StubSym.getPointer())
+ StubSym = MachineModuleInfoImpl::
+ StubValueTy(const_cast<MCSymbol *>(Sym), true /* access indirectly */);
+
+ const MCExpr *BSymExpr =
+ MCSymbolRefExpr::Create(BaseSym, MCSymbolRefExpr::VK_None, Ctx);
+ const MCExpr *LHS =
+ MCSymbolRefExpr::Create(Stub, MCSymbolRefExpr::VK_None, Ctx);
+
+ if (!Offset)
+ return MCBinaryExpr::CreateSub(LHS, BSymExpr, Ctx);
+
+ const MCExpr *RHS =
+ MCBinaryExpr::CreateAdd(BSymExpr, MCConstantExpr::Create(Offset, Ctx), Ctx);
+ return MCBinaryExpr::CreateSub(LHS, RHS, Ctx);
+}
+
//===----------------------------------------------------------------------===//
// COFF
//===----------------------------------------------------------------------===//
COFF::IMAGE_SCN_MEM_EXECUTE |
COFF::IMAGE_SCN_MEM_READ |
COFF::IMAGE_SCN_CNT_CODE;
- else if (K.isBSS ())
+ else if (K.isBSS())
Flags |=
COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ |
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ |
COFF::IMAGE_SCN_MEM_WRITE;
- else if (K.isReadOnly())
+ else if (K.isReadOnly() || K.isReadOnlyWithRel())
Flags |=
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ;
return Flags;
}
-const MCSection *TargetLoweringObjectFileCOFF::
-getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
- Mangler *Mang, const TargetMachine &TM) const {
+static const GlobalValue *getComdatGVForCOFF(const GlobalValue *GV) {
+ const Comdat *C = GV->getComdat();
+ assert(C && "expected GV to have a Comdat!");
+
+ StringRef ComdatGVName = C->getName();
+ const GlobalValue *ComdatGV = GV->getParent()->getNamedValue(ComdatGVName);
+ if (!ComdatGV)
+ report_fatal_error("Associative COMDAT symbol '" + ComdatGVName +
+ "' does not exist.");
+
+ if (ComdatGV->getComdat() != C)
+ report_fatal_error("Associative COMDAT symbol '" + ComdatGVName +
+ "' is not a key for its COMDAT.");
+
+ return ComdatGV;
+}
+
+static int getSelectionForCOFF(const GlobalValue *GV) {
+ if (const Comdat *C = GV->getComdat()) {
+ const GlobalValue *ComdatKey = getComdatGVForCOFF(GV);
+ if (const auto *GA = dyn_cast<GlobalAlias>(ComdatKey))
+ ComdatKey = GA->getBaseObject();
+ if (ComdatKey == GV) {
+ switch (C->getSelectionKind()) {
+ case Comdat::Any:
+ return COFF::IMAGE_COMDAT_SELECT_ANY;
+ case Comdat::ExactMatch:
+ return COFF::IMAGE_COMDAT_SELECT_EXACT_MATCH;
+ case Comdat::Largest:
+ return COFF::IMAGE_COMDAT_SELECT_LARGEST;
+ case Comdat::NoDuplicates:
+ return COFF::IMAGE_COMDAT_SELECT_NODUPLICATES;
+ case Comdat::SameSize:
+ return COFF::IMAGE_COMDAT_SELECT_SAME_SIZE;
+ }
+ } else {
+ return COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE;
+ }
+ } else if (GV->isWeakForLinker()) {
+ return COFF::IMAGE_COMDAT_SELECT_ANY;
+ }
+ return 0;
+}
+
+const MCSection *TargetLoweringObjectFileCOFF::getExplicitSectionGlobal(
+ const GlobalValue *GV, SectionKind Kind, Mangler &Mang,
+ const TargetMachine &TM) const {
int Selection = 0;
unsigned Characteristics = getCOFFSectionFlags(Kind);
- SmallString<128> Name(GV->getSection().c_str());
- if (GV->isWeakForLinker()) {
- Selection = COFF::IMAGE_COMDAT_SELECT_ANY;
- Characteristics |= COFF::IMAGE_SCN_LNK_COMDAT;
- Name.append("$");
- Mang->getNameWithPrefix(Name, GV, false, false);
+ StringRef Name = GV->getSection();
+ StringRef COMDATSymName = "";
+ if (GV->hasComdat()) {
+ Selection = getSelectionForCOFF(GV);
+ const GlobalValue *ComdatGV;
+ if (Selection == COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE)
+ ComdatGV = getComdatGVForCOFF(GV);
+ else
+ ComdatGV = GV;
+
+ if (!ComdatGV->hasPrivateLinkage()) {
+ MCSymbol *Sym = TM.getSymbol(ComdatGV, Mang);
+ COMDATSymName = Sym->getName();
+ Characteristics |= COFF::IMAGE_SCN_LNK_COMDAT;
+ } else {
+ Selection = 0;
+ }
}
return getContext().getCOFFSection(Name,
Characteristics,
Kind,
+ COMDATSymName,
Selection);
}
-static const char *getCOFFSectionPrefixForUniqueGlobal(SectionKind Kind) {
+static const char *getCOFFSectionNameForUniqueGlobal(SectionKind Kind) {
if (Kind.isText())
- return ".text$";
- if (Kind.isBSS ())
- return ".bss$";
- if (Kind.isThreadLocal()) {
- // 'LLVM' is just an arbitary string to ensure that the section name gets
- // sorted in between '.tls$AAA' and '.tls$ZZZ' by the linker.
- return ".tls$LLVM";
- }
- if (Kind.isWriteable())
- return ".data$";
- return ".rdata$";
+ return ".text";
+ if (Kind.isBSS())
+ return ".bss";
+ if (Kind.isThreadLocal())
+ return ".tls$";
+ if (Kind.isReadOnly() || Kind.isReadOnlyWithRel())
+ return ".rdata";
+ return ".data";
}
const MCSection *TargetLoweringObjectFileCOFF::
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 = getCOFFSectionPrefixForUniqueGlobal(Kind);
- SmallString<128> Name(Prefix, Prefix+strlen(Prefix));
- Mang->getNameWithPrefix(Name, GV, false, false);
+ Mangler &Mang, const TargetMachine &TM) const {
+ // If we have -ffunction-sections then we should emit the global value to a
+ // uniqued section specifically for it.
+ bool EmitUniquedSection;
+ if (Kind.isText())
+ EmitUniquedSection = TM.getFunctionSections();
+ else
+ EmitUniquedSection = TM.getDataSections();
+ if ((EmitUniquedSection && !Kind.isCommon()) || GV->hasComdat()) {
+ const char *Name = getCOFFSectionNameForUniqueGlobal(Kind);
unsigned Characteristics = getCOFFSectionFlags(Kind);
Characteristics |= COFF::IMAGE_SCN_LNK_COMDAT;
-
- return getContext().getCOFFSection(Name.str(), Characteristics,
- Kind, COFF::IMAGE_COMDAT_SELECT_ANY);
+ int Selection = getSelectionForCOFF(GV);
+ if (!Selection)
+ Selection = COFF::IMAGE_COMDAT_SELECT_NODUPLICATES;
+ const GlobalValue *ComdatGV;
+ if (GV->hasComdat())
+ ComdatGV = getComdatGVForCOFF(GV);
+ else
+ ComdatGV = GV;
+
+ if (!ComdatGV->hasPrivateLinkage()) {
+ MCSymbol *Sym = TM.getSymbol(ComdatGV, Mang);
+ StringRef COMDATSymName = Sym->getName();
+ return getContext().getCOFFSection(Name, Characteristics, Kind,
+ COMDATSymName, Selection);
+ } else {
+ SmallString<256> TmpData;
+ getNameWithPrefix(TmpData, GV, /*CannotUsePrivateLabel=*/true, Mang, TM);
+ return getContext().getCOFFSection(Name, Characteristics, Kind, TmpData,
+ Selection);
+ }
}
if (Kind.isText())
if (Kind.isThreadLocal())
return TLSDataSection;
- if (Kind.isReadOnly())
+ if (Kind.isReadOnly() || Kind.isReadOnlyWithRel())
return ReadOnlySection;
- if (Kind.isBSS())
+ // 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;
return DataSection;
}
+void TargetLoweringObjectFileCOFF::getNameWithPrefix(
+ SmallVectorImpl<char> &OutName, const GlobalValue *GV,
+ bool CannotUsePrivateLabel, Mangler &Mang, const TargetMachine &TM) const {
+ if (GV->hasPrivateLinkage() &&
+ ((isa<Function>(GV) && TM.getFunctionSections()) ||
+ (isa<GlobalVariable>(GV) && TM.getDataSections())))
+ CannotUsePrivateLabel = true;
+
+ Mang.getNameWithPrefix(OutName, GV, CannotUsePrivateLabel);
+}
+
+const MCSection *TargetLoweringObjectFileCOFF::getSectionForJumpTable(
+ const Function &F, Mangler &Mang, const TargetMachine &TM) const {
+ // If the function can be removed, produce a unique section so that
+ // the table doesn't prevent the removal.
+ const Comdat *C = F.getComdat();
+ bool EmitUniqueSection = TM.getFunctionSections() || C;
+ if (!EmitUniqueSection)
+ return ReadOnlySection;
+
+ // FIXME: we should produce a symbol for F instead.
+ if (F.hasPrivateLinkage())
+ return ReadOnlySection;
+
+ MCSymbol *Sym = TM.getSymbol(&F, Mang);
+ StringRef COMDATSymName = Sym->getName();
+
+ SectionKind Kind = SectionKind::getReadOnly();
+ const char *Name = getCOFFSectionNameForUniqueGlobal(Kind);
+ unsigned Characteristics = getCOFFSectionFlags(Kind);
+ Characteristics |= COFF::IMAGE_SCN_LNK_COMDAT;
+
+ return getContext().getCOFFSection(Name, Characteristics, Kind, COMDATSymName,
+ COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE);
+}
+
+StringRef TargetLoweringObjectFileCOFF::
+getDepLibFromLinkerOpt(StringRef LinkerOption) const {
+ const char *LibCmd = "/DEFAULTLIB:";
+ if (LinkerOption.startswith(LibCmd))
+ return LinkerOption.substr(strlen(LibCmd));
+ return StringRef();
+}
+
void TargetLoweringObjectFileCOFF::
emitModuleFlags(MCStreamer &Streamer,
ArrayRef<Module::ModuleFlagEntry> ModuleFlags,
- Mangler *Mang, const TargetMachine &TM) const {
- MDNode *LinkerOptions = 0;
+ Mangler &Mang, const TargetMachine &TM) const {
+ MDNode *LinkerOptions = nullptr;
// Look for the "Linker Options" flag, since it's the only one we support.
for (ArrayRef<Module::ModuleFlagEntry>::iterator
i = ModuleFlags.begin(), e = ModuleFlags.end(); i != e; ++i) {
const Module::ModuleFlagEntry &MFE = *i;
StringRef Key = MFE.Key->getString();
- Value *Val = MFE.Val;
+ Metadata *Val = MFE.Val;
if (Key == "Linker Options") {
LinkerOptions = cast<MDNode>(Val);
break;
MDNode *MDOptions = cast<MDNode>(LinkerOptions->getOperand(i));
for (unsigned ii = 0, ie = MDOptions->getNumOperands(); ii != ie; ++ii) {
MDString *MDOption = cast<MDString>(MDOptions->getOperand(ii));
- StringRef Op = MDOption->getString();
// Lead with a space for consistency with our dllexport implementation.
- std::string Escaped(" ");
- if (Op.find(" ") != StringRef::npos) {
- // The PE-COFF spec says args with spaces must be quoted. It doesn't say
- // how to escape quotes, but it probably uses this algorithm:
- // http://msdn.microsoft.com/en-us/library/17w5ykft(v=vs.85).aspx
- // FIXME: Reuse escaping code from Support/Windows/Program.inc
- Escaped.push_back('\"');
- Escaped.append(Op);
- Escaped.push_back('\"');
- } else {
- Escaped.append(Op);
- }
- Streamer.EmitBytes(Escaped);
+ std::string Directive(" ");
+ Directive.append(MDOption->getString());
+ Streamer.EmitBytes(Directive);
}
}
}
+
+const MCSection *TargetLoweringObjectFileCOFF::getStaticCtorSection(
+ unsigned Priority, const MCSymbol *KeySym) const {
+ return getContext().getAssociativeCOFFSection(
+ cast<MCSectionCOFF>(StaticCtorSection), KeySym);
+}
+
+const MCSection *TargetLoweringObjectFileCOFF::getStaticDtorSection(
+ unsigned Priority, const MCSymbol *KeySym) const {
+ return getContext().getAssociativeCOFFSection(
+ cast<MCSectionCOFF>(StaticDtorSection), KeySym);
+}
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