#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
+#include "llvm/Function.h"
#include "llvm/GlobalVariable.h"
#include "llvm/MC/MCContext.h"
-#include "llvm/MC/MCSection.h"
-#include "llvm/Target/TargetAsmInfo.h"
+#include "llvm/MC/MCSectionMachO.h"
+#include "llvm/MC/MCSectionELF.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Support/Mangler.h"
+#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
using namespace llvm;
const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
if (GVar == 0)
return SectionKind::getText();
-
// Handle thread-local data first.
if (GVar->isThreadLocal()) {
//===----------------------------------------------------------------------===//
// ELF
//===----------------------------------------------------------------------===//
+typedef StringMap<const MCSectionELF*> ELFUniqueMapTy;
+
+TargetLoweringObjectFileELF::~TargetLoweringObjectFileELF() {
+ // If we have the section uniquing map, free it.
+ delete (ELFUniqueMapTy*)UniquingMap;
+}
const MCSection *TargetLoweringObjectFileELF::
-getELFSection(const char *Name, bool isDirective, SectionKind Kind) const {
- if (MCSection *S = getContext().GetSection(Name))
- return S;
- return MCSectionELF::Create(Name, isDirective, Kind, getContext());
+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);
- if (!HasCrazyBSS)
- BSSSection = getELFSection("\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 = getELFSection("\t.bss", false, SectionKind::getBSS());
+ BSSSection =
+ getELFSection(".bss", MCSectionELF::SHT_NOBITS,
+ MCSectionELF::SHF_WRITE | MCSectionELF::SHF_ALLOC,
+ SectionKind::getBSS());
- TextSection = getELFSection("\t.text", true, SectionKind::getText());
- DataSection = getELFSection("\t.data", true, SectionKind::getDataRel());
- ReadOnlySection =
- getELFSection("\t.rodata", false, SectionKind::getReadOnly());
- TLSDataSection =
- getELFSection("\t.tdata", false, SectionKind::getThreadData());
-
- TLSBSSSection = getELFSection("\t.tbss", false,
- SectionKind::getThreadBSS());
-
- DataRelSection = getELFSection("\t.data.rel", false,
- SectionKind::getDataRel());
- DataRelLocalSection = getELFSection("\t.data.rel.local", false,
- SectionKind::getDataRelLocal());
- DataRelROSection = getELFSection("\t.data.rel.ro", false,
- SectionKind::getReadOnlyWithRel());
- DataRelROLocalSection =
- getELFSection("\t.data.rel.ro.local", false,
- SectionKind::getReadOnlyWithRelLocal());
+ 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", false,
- SectionKind::getMergeableConst4());
- MergeableConst8Section = getELFSection(".rodata.cst8", false,
- SectionKind::getMergeableConst8());
- MergeableConst16Section = getELFSection(".rodata.cst16", false,
- SectionKind::getMergeableConst16());
+ 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", false, SectionKind::getDataRel());
+ getELFSection(".ctors", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE,
+ SectionKind::getDataRel());
+
StaticDtorSection =
- getELFSection(".dtors", false, SectionKind::getDataRel());
+ getELFSection(".dtors", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE,
+ SectionKind::getDataRel());
// Exception Handling Sections.
// 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", false, SectionKind::getReadOnly());
+ getELFSection(".gcc_except_table", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC, SectionKind::getReadOnly());
EHFrameSection =
- getELFSection(".eh_frame", false, SectionKind::getDataRel());
+ getELFSection(".eh_frame", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE,
+ SectionKind::getDataRel());
// Debug Info Sections.
DwarfAbbrevSection =
- getELFSection(".debug_abbrev", false, SectionKind::getMetadata());
+ getELFSection(".debug_abbrev", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
DwarfInfoSection =
- getELFSection(".debug_info", false, SectionKind::getMetadata());
+ getELFSection(".debug_info", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
DwarfLineSection =
- getELFSection(".debug_line", false, SectionKind::getMetadata());
+ getELFSection(".debug_line", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
DwarfFrameSection =
- getELFSection(".debug_frame", false, SectionKind::getMetadata());
+ getELFSection(".debug_frame", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
DwarfPubNamesSection =
- getELFSection(".debug_pubnames", false, SectionKind::getMetadata());
+ getELFSection(".debug_pubnames", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
DwarfPubTypesSection =
- getELFSection(".debug_pubtypes", false, SectionKind::getMetadata());
+ getELFSection(".debug_pubtypes", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
DwarfStrSection =
- getELFSection(".debug_str", false, SectionKind::getMetadata());
+ getELFSection(".debug_str", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
DwarfLocSection =
- getELFSection(".debug_loc", false, SectionKind::getMetadata());
+ getELFSection(".debug_loc", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
DwarfARangesSection =
- getELFSection(".debug_aranges", false, SectionKind::getMetadata());
+ getELFSection(".debug_aranges", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
DwarfRangesSection =
- getELFSection(".debug_ranges", false, SectionKind::getMetadata());
+ getELFSection(".debug_ranges", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
DwarfMacroInfoSection =
- getELFSection(".debug_macinfo", false, SectionKind::getMetadata());
+ getELFSection(".debug_macinfo", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
}
return K;
}
+
+static unsigned
+getELFSectionType(const char *Name, SectionKind K) {
+
+ if (strcmp(Name, ".init_array") == 0)
+ return MCSectionELF::SHT_INIT_ARRAY;
+
+ if (strcmp(Name, ".fini_array") == 0)
+ return MCSectionELF::SHT_FINI_ARRAY;
+
+ if (strcmp(Name, ".preinit_array") == 0)
+ 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 {
+ const char *SectionName = GV->getSection().c_str();
+
// Infer section flags from the section name if we can.
- Kind = getELFKindForNamedSection(GV->getSection().c_str(), Kind);
+ Kind = getELFKindForNamedSection(SectionName, Kind);
- return getELFSection(GV->getSection().c_str(), false, Kind);
+ return getELFSection(SectionName,
+ getELFSectionType(SectionName, Kind),
+ getELFSectionFlags(Kind), Kind, true);
}
static const char *getSectionPrefixForUniqueGlobal(SectionKind Kind) {
if (GV->isWeakForLinker()) {
const char *Prefix = getSectionPrefixForUniqueGlobal(Kind);
std::string Name = Mang->makeNameProper(GV->getNameStr());
- return getELFSection((Prefix+Name).c_str(), false, Kind);
+
+ return getELFSection((Prefix+Name).c_str(),
+ getELFSectionType((Prefix+Name).c_str(), Kind),
+ getELFSectionFlags(Kind),
+ Kind);
}
if (Kind.isText()) return TextSection;
std::string Name = SizeSpec + utostr(Align);
- return getELFSection(Name.c_str(), false, Kind);
+ return getELFSection(Name.c_str(), MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC |
+ MCSectionELF::SHF_MERGE |
+ MCSectionELF::SHF_STRINGS,
+ Kind);
}
if (Kind.isMergeableConst()) {
- if (Kind.isMergeableConst4())
+ if (Kind.isMergeableConst4() && MergeableConst4Section)
return MergeableConst4Section;
- if (Kind.isMergeableConst8())
+ if (Kind.isMergeableConst8() && MergeableConst8Section)
return MergeableConst8Section;
- if (Kind.isMergeableConst16())
+ if (Kind.isMergeableConst16() && MergeableConst16Section)
return MergeableConst16Section;
return ReadOnlySection; // .const
}
/// should be placed in.
const MCSection *TargetLoweringObjectFileELF::
getSectionForConstant(SectionKind Kind) const {
- if (Kind.isMergeableConst4())
+ if (Kind.isMergeableConst4() && MergeableConst4Section)
return MergeableConst4Section;
- if (Kind.isMergeableConst8())
+ if (Kind.isMergeableConst8() && MergeableConst8Section)
return MergeableConst8Section;
- if (Kind.isMergeableConst16())
+ if (Kind.isMergeableConst16() && MergeableConst16Section)
return MergeableConst16Section;
if (Kind.isReadOnly())
return ReadOnlySection;
// MachO
//===----------------------------------------------------------------------===//
+typedef StringMap<const MCSectionMachO*> MachOUniqueMapTy;
-const MCSection *TargetLoweringObjectFileMachO::
-getMachOSection(StringRef Segment, StringRef Section,
+TargetLoweringObjectFileMachO::~TargetLoweringObjectFileMachO() {
+ // If we have the MachO uniquing map, free it.
+ delete (MachOUniqueMapTy*)UniquingMap;
+}
+
+
+const MCSectionMachO *TargetLoweringObjectFileMachO::
+getMachOSection(const StringRef &Segment, const StringRef &Section,
unsigned TypeAndAttributes,
unsigned Reserved2, SectionKind Kind) const {
- // FIXME: UNIQUE HERE.
- //if (MCSection *S = getContext().GetSection(Name))
- // return S;
+ // 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;
- return MCSectionMachO::Create(Segment, Section, TypeAndAttributes, Reserved2,
- Kind, getContext());
+ // 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("__DATA","__datacoal_nt", MCSectionMachO::S_COALESCED,
SectionKind::getDataRel());
+
+ 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());
SectionKind::getMetadata());
}
-/// getLazySymbolPointerSection - Return the section corresponding to
-/// the .lazy_symbol_pointer directive.
-const MCSection *TargetLoweringObjectFileMachO::
-getLazySymbolPointerSection() const {
- return getMachOSection("__DATA", "__la_symbol_ptr",
- MCSectionMachO::S_LAZY_SYMBOL_POINTERS,
- SectionKind::getMetadata());
-}
-
-/// getNonLazySymbolPointerSection - Return the section corresponding to
-/// the .non_lazy_symbol_pointer directive.
-const MCSection *TargetLoweringObjectFileMachO::
-getNonLazySymbolPointerSection() const {
- return getMachOSection("__DATA", "__nl_symbol_ptr",
- MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS,
- SectionKind::getMetadata());
-}
-
-
const MCSection *TargetLoweringObjectFileMachO::
getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler *Mang, const TargetMachine &TM) const {
std::string ErrorCode =
MCSectionMachO::ParseSectionSpecifier(GV->getSection(), Segment, Section,
TAA, StubSize);
- if (ErrorCode.empty())
- return getMachOSection(Segment, Section, TAA, StubSize, Kind);
+ 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);
- // 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;
+ // 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::
// COFF
//===----------------------------------------------------------------------===//
+typedef StringMap<const MCSectionCOFF*> COFFUniqueMapTy;
+
+TargetLoweringObjectFileCOFF::~TargetLoweringObjectFileCOFF() {
+ delete (COFFUniqueMapTy*)UniquingMap;
+}
+
const MCSection *TargetLoweringObjectFileCOFF::
getCOFFSection(const char *Name, bool isDirective, SectionKind Kind) const {
- if (MCSection *S = getContext().GetSection(Name))
- return S;
- return MCSectionCOFF::Create(Name, isDirective, Kind, getContext());
+ // 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());
}
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());
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.
projects / oota-llvm.git / blobdiff