#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetMachine.h"
+#include "llvm/Target/TargetSubtargetInfo.h"
using namespace llvm;
using namespace dwarf;
const MCSection *Sec = getContext().getELFSection(NameData,
ELF::SHT_PROGBITS,
Flags,
- SectionKind::getDataRel(),
0, Label->getName());
unsigned Size = TM.getDataLayout()->getPointerSize();
Streamer.SwitchSection(Sec);
static unsigned
-getELFSectionFlags(SectionKind K) {
+getELFSectionFlags(SectionKind K, bool InCOMDAT) {
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())
+ // FIXME: There is nothing in ELF preventing an SHF_MERGE from being
+ // in a comdat. We just avoid it for now because we don't print
+ // those .sections correctly.
+ if (!InCOMDAT && (K.isMergeableCString() || K.isMergeableConst()))
Flags |= ELF::SHF_MERGE;
if (K.isMergeableCString())
Kind = getELFKindForNamedSection(SectionName, Kind);
StringRef Group = "";
- unsigned Flags = getELFSectionFlags(Kind);
+ unsigned Flags = getELFSectionFlags(Kind, GV->hasComdat());
if (const Comdat *C = getELFComdat(GV)) {
Group = C->getName();
Flags |= ELF::SHF_GROUP;
}
return getContext().getELFSection(SectionName,
getELFSectionType(SectionName, Kind), Flags,
- Kind, /*EntrySize=*/0, Group);
+ /*EntrySize=*/0, Group);
}
-/// getSectionPrefixForGlobal - Return the section prefix name used by options
-/// FunctionsSections and DataSections.
+/// 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.";
-
+ 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.";
}
const MCSection *TargetLoweringObjectFileELF::
SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler &Mang, const TargetMachine &TM) const {
+ unsigned Flags = getELFSectionFlags(Kind, GV->hasComdat());
+
// 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();
+ bool EmitUniquedSection = false;
+ if (!(Flags & ELF::SHF_MERGE) && !Kind.isCommon()) {
+ 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 || GV->hasComdat()) &&
- !Kind.isCommon()) {
+ if (EmitUniquedSection || GV->hasComdat()) {
StringRef Prefix = getSectionPrefixForGlobal(Kind);
SmallString<128> Name(Prefix);
TM.getNameWithPrefix(Name, GV, Mang, true);
StringRef Group = "";
- unsigned Flags = getELFSectionFlags(Kind);
- if (GV->isWeakForLinker() || GV->hasComdat()) {
- if (const Comdat *C = getELFComdat(GV))
- Group = C->getName();
- else
- Group = Name.substr(Prefix.size());
+ if (const Comdat *C = getELFComdat(GV)) {
Flags |= ELF::SHF_GROUP;
+ Group = C->getName();
}
- return getContext().getELFSection(Name.str(),
- getELFSectionType(Name.str(), Kind),
- Flags, Kind, 0, Group);
+ return getContext().getELFSection(
+ Name.str(), getELFSectionType(Name.str(), Kind), Flags, 0, Group);
}
if (Kind.isText()) return TextSection;
- if (Kind.isMergeable1ByteCString() ||
- Kind.isMergeable2ByteCString() ||
- Kind.isMergeable4ByteCString()) {
+ 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.";
+ unsigned EntrySize = 1;
if (Kind.isMergeable2ByteCString())
- SizeSpec = ".rodata.str2.";
+ EntrySize = 2;
else if (Kind.isMergeable4ByteCString())
- SizeSpec = ".rodata.str4.";
+ EntrySize = 4;
else
assert(Kind.isMergeable1ByteCString() && "unknown string width");
-
+ std::string SizeSpec = ".rodata.str" + utostr(EntrySize) + ".";
std::string Name = SizeSpec + utostr(Align);
- return getContext().getELFSection(Name, ELF::SHT_PROGBITS,
- ELF::SHF_ALLOC |
- ELF::SHF_MERGE |
- ELF::SHF_STRINGS,
- Kind);
+ return getContext().getELFSection(
+ Name, ELF::SHT_PROGBITS,
+ ELF::SHF_ALLOC | ELF::SHF_MERGE | ELF::SHF_STRINGS, EntrySize, "");
}
if (Kind.isMergeableConst()) {
return DataRelROSection;
}
+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;
+
+ SmallString<128> Name(".rodata.");
+ TM.getNameWithPrefix(Name, &F, Mang, true);
+
+ unsigned Flags = ELF::SHF_ALLOC;
+ StringRef Group = "";
+ if (C) {
+ Flags |= ELF::SHF_GROUP;
+ Group = C->getName();
+ }
+
+ return getContext().getELFSection(Name, ELF::SHT_PROGBITS, Flags, 0, Group);
+}
+
/// 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 MCSymbol *KeySym) 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(
+const MCSection *TargetLoweringObjectFileELF::getStaticCtorSection(
unsigned Priority, const MCSymbol *KeySym) const {
- // The default scheme is .ctor / .dtor, so we have to invert the priority
- // numbering.
- if (Priority == 65535)
- return StaticDtorSection;
+ 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);
}
//===----------------------------------------------------------------------===//
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") {
return S;
}
-bool TargetLoweringObjectFileMachO::isSectionAtomizableBySymbols(
- const MCSection &Section) const {
- const MCSectionMachO &SMO = static_cast<const MCSectionMachO&>(Section);
-
- // Sections holding 1 byte strings are atomized based on the data
- // they contain.
- // Sections holding 2 byte strings require symbols in order to be
- // atomized.
- // There is no dedicated section for 4 byte strings.
- if (SMO.getKind().isMergeable1ByteCString())
- return false;
-
- if (SMO.getSegmentName() == "__DATA" &&
- SMO.getSectionName() == "__cfstring")
- return false;
-
- switch (SMO.getType()) {
- default:
- return true;
-
- // These sections are atomized at the element boundaries without using
- // symbols.
- case MachO::S_4BYTE_LITERALS:
- case MachO::S_8BYTE_LITERALS:
- case MachO::S_16BYTE_LITERALS:
- case MachO::S_LITERAL_POINTERS:
- case MachO::S_NON_LAZY_SYMBOL_POINTERS:
- case MachO::S_LAZY_SYMBOL_POINTERS:
- case MachO::S_MOD_INIT_FUNC_POINTERS:
- case MachO::S_MOD_TERM_FUNC_POINTERS:
- case MachO::S_INTERPOSING:
- return false;
- }
-}
-
const MCSection *TargetLoweringObjectFileMachO::
SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler &Mang, const TargetMachine &TM) const {
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())
}
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())
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 GlobalValue *getComdatGVForCOFF(const GlobalValue *GV) {
+static const GlobalValue *getComdatGVForCOFF(const GlobalValue *GV) {
const Comdat *C = GV->getComdat();
assert(C && "expected GV to have a Comdat!");
if (ComdatGV->getComdat() != C)
report_fatal_error("Associative COMDAT symbol '" + ComdatGVName +
- "' is not a key for it's COMDAT.");
+ "' is not a key for its COMDAT.");
return ComdatGV;
}
unsigned Characteristics = getCOFFSectionFlags(Kind);
StringRef Name = GV->getSection();
StringRef COMDATSymName = "";
- if ((GV->isWeakForLinker() || GV->hasComdat()) && !Kind.isCommon()) {
+ if (GV->hasComdat()) {
Selection = getSelectionForCOFF(GV);
const GlobalValue *ComdatGV;
if (Selection == COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE)
return ".bss";
if (Kind.isThreadLocal())
return ".tls$";
- if (Kind.isWriteable())
- return ".data";
- return ".rdata";
+ if (Kind.isReadOnly() || Kind.isReadOnlyWithRel())
+ return ".rdata";
+ return ".data";
}
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.
- // Section names depend on the name of the symbol which is not feasible if the
- // symbol has private linkage.
- if ((GV->isWeakForLinker() || EmitUniquedSection || GV->hasComdat()) &&
- !Kind.isCommon()) {
+ if ((EmitUniquedSection && !Kind.isCommon()) || GV->hasComdat()) {
const char *Name = getCOFFSectionNameForUniqueGlobal(Kind);
unsigned Characteristics = getCOFFSectionFlags(Kind);
if (Kind.isThreadLocal())
return TLSDataSection;
- if (Kind.isReadOnly())
+ if (Kind.isReadOnly() || Kind.isReadOnlyWithRel())
return ReadOnlySection;
// Note: we claim that common symbols are put in BSSSection, but they are
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;
StringRef Op = MDOption->getString();
// Lead with a space for consistency with our dllexport implementation.
std::string Escaped(" ");
- if (Op.find(" ") != StringRef::npos) {
+ if (!Op.startswith("\"") && (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
}
}
-static const MCSection *getAssociativeCOFFSection(MCContext &Ctx,
- const MCSection *Sec,
- const MCSymbol *KeySym) {
- // Return the normal section if we don't have to be associative.
- if (!KeySym)
- return Sec;
-
- // Make an associative section with the same name and kind as the normal
- // section.
- const MCSectionCOFF *SecCOFF = cast<MCSectionCOFF>(Sec);
- unsigned Characteristics =
- SecCOFF->getCharacteristics() | COFF::IMAGE_SCN_LNK_COMDAT;
- return Ctx.getCOFFSection(SecCOFF->getSectionName(), Characteristics,
- SecCOFF->getKind(), KeySym->getName(),
- COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE);
-}
-
const MCSection *TargetLoweringObjectFileCOFF::getStaticCtorSection(
unsigned Priority, const MCSymbol *KeySym) const {
- return getAssociativeCOFFSection(getContext(), StaticCtorSection, KeySym);
+ return getContext().getAssociativeCOFFSection(
+ cast<MCSectionCOFF>(StaticCtorSection), KeySym);
}
const MCSection *TargetLoweringObjectFileCOFF::getStaticDtorSection(
unsigned Priority, const MCSymbol *KeySym) const {
- return getAssociativeCOFFSection(getContext(), StaticDtorSection, KeySym);
+ return getContext().getAssociativeCOFFSection(
+ cast<MCSectionCOFF>(StaticDtorSection), KeySym);
}
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