#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/MCExpr.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/ErrorHandling.h"
#include "llvm/Support/Mangler.h"
+#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
using namespace llvm;
static bool isSuitableForBSS(const GlobalVariable *GV) {
Constant *C = GV->getInitializer();
-
+
// Must have zero initializer.
if (!C->isNullValue())
return false;
-
+
// Leave constant zeros in readonly constant sections, so they can be shared.
if (GV->isConstant())
return false;
-
+
// If the global has an explicit section specified, don't put it in BSS.
if (!GV->getSection().empty())
return false;
-
+
// If -nozero-initialized-in-bss is specified, don't ever use BSS.
if (NoZerosInBSS)
return false;
-
+
// Otherwise, put it in BSS!
return true;
}
/// nul value and contains no other nuls in it.
static bool IsNullTerminatedString(const Constant *C) {
const ArrayType *ATy = cast<ArrayType>(C->getType());
-
+
// First check: is we have constant array of i8 terminated with zero
if (const ConstantArray *CVA = dyn_cast<ConstantArray>(C)) {
if (ATy->getNumElements() == 0) return false;
dyn_cast<ConstantInt>(CVA->getOperand(ATy->getNumElements()-1));
if (Null == 0 || Null->getZExtValue() != 0)
return false; // Not null terminated.
-
+
// Verify that the null doesn't occur anywhere else in the string.
for (unsigned i = 0, e = ATy->getNumElements()-1; i != e; ++i)
// Reject constantexpr elements etc.
const TargetMachine &TM){
assert(!GV->isDeclaration() && !GV->hasAvailableExternallyLinkage() &&
"Can only be used for global definitions");
-
+
Reloc::Model ReloModel = TM.getRelocationModel();
-
+
// Early exit - functions should be always in text sections.
const GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV);
if (GVar == 0)
return SectionKind::getText();
-
// Handle thread-local data first.
if (GVar->isThreadLocal()) {
if (isSuitableForBSS(GVar))
return SectionKind::getBSS();
Constant *C = GVar->getInitializer();
-
+
// If the global is marked constant, we can put it into a mergable section,
// a mergable string section, or general .data if it contains relocations.
if (GVar->isConstant()) {
// relocation, then we may have to drop this into a wriable data section
// even though it is marked const.
switch (C->getRelocationInfo()) {
- default: llvm_unreachable("unknown relocation info kind");
+ default: assert(0 && "unknown relocation info kind");
case Constant::NoRelocation:
// If initializer is a null-terminated string, put it in a "cstring"
// section of the right width.
if (const ArrayType *ATy = dyn_cast<ArrayType>(C->getType())) {
- if (const IntegerType *ITy =
+ if (const IntegerType *ITy =
dyn_cast<IntegerType>(ATy->getElementType())) {
if ((ITy->getBitWidth() == 8 || ITy->getBitWidth() == 16 ||
ITy->getBitWidth() == 32) &&
return SectionKind::getMergeable1ByteCString();
if (ITy->getBitWidth() == 16)
return SectionKind::getMergeable2ByteCString();
-
+
assert(ITy->getBitWidth() == 32 && "Unknown width");
return SectionKind::getMergeable4ByteCString();
}
}
}
-
+
// Otherwise, just drop it into a mergable constant section. If we have
// a section for this size, use it, otherwise use the arbitrary sized
// mergable section.
case 16: return SectionKind::getMergeableConst16();
default: return SectionKind::getMergeableConst();
}
-
+
case Constant::LocalRelocation:
// In static relocation model, the linker will resolve all addresses, so
// the relocation entries will actually be constants by the time the app
// merge entries in the section.
if (ReloModel == Reloc::Static)
return SectionKind::getReadOnly();
-
+
// Otherwise, the dynamic linker needs to fix it up, put it in the
// writable data.rel.local section.
return SectionKind::getReadOnlyWithRelLocal();
-
+
case Constant::GlobalRelocations:
// In static relocation model, the linker will resolve all addresses, so
// the relocation entries will actually be constants by the time the app
// merge entries in the section.
if (ReloModel == Reloc::Static)
return SectionKind::getReadOnly();
-
+
// Otherwise, the dynamic linker needs to fix it up, put it in the
// writable data.rel section.
return SectionKind::getReadOnlyWithRel();
return SectionKind::getDataNoRel();
switch (C->getRelocationInfo()) {
- default: llvm_unreachable("unknown relocation info kind");
+ default: assert(0 && "unknown relocation info kind");
case Constant::NoRelocation:
return SectionKind::getDataNoRel();
case Constant::LocalRelocation:
// Select section name.
if (GV->hasSection())
return getExplicitSectionGlobal(GV, Kind, Mang, TM);
-
-
+
+
// Use default section depending on the 'type' of global
return SelectSectionForGlobal(GV, Kind, Mang, TM);
}
Mangler *Mang,
const TargetMachine &TM) const{
assert(!Kind.isThreadLocal() && "Doesn't support TLS");
-
+
if (Kind.isText())
return getTextSection();
-
+
if (Kind.isBSS() && BSSSection != 0)
return BSSSection;
-
+
if (Kind.isReadOnly() && ReadOnlySection != 0)
return ReadOnlySection;
TargetLoweringObjectFile::getSectionForConstant(SectionKind Kind) const {
if (Kind.isReadOnly() && ReadOnlySection != 0)
return ReadOnlySection;
-
+
return DataSection;
}
+/// getSymbolForDwarfGlobalReference - Return an MCExpr to use for a
+/// pc-relative reference to the specified global variable from exception
+/// handling information. In addition to the symbol, this returns
+/// by-reference:
+///
+/// IsIndirect - True if the returned symbol is actually a stub that contains
+/// the address of the symbol, false if the symbol is the global itself.
+///
+/// IsPCRel - True if the symbol reference is already pc-relative, false if
+/// the caller needs to subtract off the address of the reference from the
+/// symbol.
+///
+const MCExpr *TargetLoweringObjectFile::
+getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
+ MachineModuleInfo *MMI,
+ bool &IsIndirect, bool &IsPCRel) const {
+ // The generic implementation of this just returns a direct reference to the
+ // symbol.
+ IsIndirect = false;
+ IsPCRel = false;
+
+ SmallString<128> Name;
+ Mang->getNameWithPrefix(Name, GV, false);
+ return MCSymbolRefExpr::Create(Name.str(), getContext());
+}
//===----------------------------------------------------------------------===//
// 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());
-
-
- TextSection = getELFSection("\t.text", true, SectionKind::getText());
- DataSection = getELFSection("\t.data", true, SectionKind::getDataRel());
+
+ BSSSection =
+ getELFSection(".bss", MCSectionELF::SHT_NOBITS,
+ MCSectionELF::SHF_WRITE | MCSectionELF::SHF_ALLOC,
+ SectionKind::getBSS());
+
+ 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("\t.rodata", false, SectionKind::getReadOnly());
+ getELFSection(".rodata", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC,
+ 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());
+ 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("\t.data.rel.ro.local", false,
- SectionKind::getReadOnlyWithRelLocal());
-
- MergeableConst4Section = getELFSection(".rodata.cst4", false,
- SectionKind::getMergeableConst4());
- MergeableConst8Section = getELFSection(".rodata.cst8", false,
- SectionKind::getMergeableConst8());
- MergeableConst16Section = getELFSection(".rodata.cst16", false,
- SectionKind::getMergeableConst16());
+ getELFSection(".data.rel.ro.local", MCSectionELF::SHT_PROGBITS,
+ MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE,
+ SectionKind::getReadOnlyWithRelLocal());
+
+ 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.
-
+
// 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 =
- 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());
- DwarfInfoSection =
- getELFSection(".debug_info", false, SectionKind::getMetadata());
- DwarfLineSection =
- getELFSection(".debug_line", false, SectionKind::getMetadata());
- DwarfFrameSection =
- getELFSection(".debug_frame", false, SectionKind::getMetadata());
- DwarfPubNamesSection =
- getELFSection(".debug_pubnames", false, SectionKind::getMetadata());
- DwarfPubTypesSection =
- getELFSection(".debug_pubtypes", false, SectionKind::getMetadata());
- DwarfStrSection =
- getELFSection(".debug_str", false, SectionKind::getMetadata());
- DwarfLocSection =
- getELFSection(".debug_loc", false, SectionKind::getMetadata());
- DwarfARangesSection =
- getELFSection(".debug_aranges", false, SectionKind::getMetadata());
- DwarfRangesSection =
- getELFSection(".debug_ranges", false, SectionKind::getMetadata());
- DwarfMacroInfoSection =
- getELFSection(".debug_macinfo", false, SectionKind::getMetadata());
-}
-
-
-static SectionKind
+ DwarfAbbrevSection =
+ getELFSection(".debug_abbrev", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
+ DwarfInfoSection =
+ getELFSection(".debug_info", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
+ DwarfLineSection =
+ getELFSection(".debug_line", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
+ DwarfFrameSection =
+ getELFSection(".debug_frame", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
+ DwarfPubNamesSection =
+ getELFSection(".debug_pubnames", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
+ DwarfPubTypesSection =
+ getELFSection(".debug_pubtypes", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
+ DwarfStrSection =
+ getELFSection(".debug_str", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
+ DwarfLocSection =
+ getELFSection(".debug_loc", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
+ DwarfARangesSection =
+ getELFSection(".debug_aranges", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
+ DwarfRangesSection =
+ getELFSection(".debug_ranges", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
+ DwarfMacroInfoSection =
+ getELFSection(".debug_macinfo", MCSectionELF::SHT_PROGBITS, 0,
+ SectionKind::getMetadata());
+}
+
+
+static SectionKind
getELFKindForNamedSection(const char *Name, SectionKind K) {
if (Name[0] != '.') return K;
-
+
// Some lame default implementation based on some magic section names.
- if (strncmp(Name, ".gnu.linkonce.b.", 16) == 0 ||
+ if (strcmp(Name, ".bss") == 0 ||
+ strncmp(Name, ".bss.", 5) == 0 ||
+ strncmp(Name, ".gnu.linkonce.b.", 16) == 0 ||
strncmp(Name, ".llvm.linkonce.b.", 17) == 0 ||
+ strcmp(Name, ".sbss") == 0 ||
+ strncmp(Name, ".sbss.", 6) == 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;
}
+
+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,
+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);
-
- return getELFSection(GV->getSection().c_str(), false, Kind);
+ Kind = getELFKindForNamedSection(SectionName, Kind);
+
+ return getELFSection(SectionName,
+ getELFSectionType(SectionName, Kind),
+ getELFSectionFlags(Kind), Kind, true);
}
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 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;
-
+
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 =
+ unsigned Align =
TM.getTargetData()->getPreferredAlignment(cast<GlobalVariable>(GV));
-
+
const char *SizeSpec = ".rodata.str1.";
if (Kind.isMergeable2ByteCString())
SizeSpec = ".rodata.str2.";
SizeSpec = ".rodata.str4.";
else
assert(Kind.isMergeable1ByteCString() && "unknown string width");
-
-
+
+
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
}
-
+
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;
}
/// 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;
-
+
if (Kind.isReadOnlyWithRelLocal()) return DataRelROLocalSection;
assert(Kind.isReadOnlyWithRel() && "Unknown section kind");
return DataRelROSection;
// MachO
//===----------------------------------------------------------------------===//
+typedef StringMap<const MCSectionMachO*> MachOUniqueMapTy;
-const MCSection *TargetLoweringObjectFileMachO::
+TargetLoweringObjectFileMachO::~TargetLoweringObjectFileMachO() {
+ // If we have the MachO uniquing map, free it.
+ delete (MachOUniqueMapTy*)UniquingMap;
+}
+
+
+const MCSectionMachO *TargetLoweringObjectFileMachO::
getMachOSection(StringRef Segment, StringRef Section,
unsigned TypeAndAttributes,
unsigned Reserved2, SectionKind Kind) const {
- // FIXME: UNIQUE HERE.
- //if (MCSection *S = getContext().GetSection(Name))
- // return S;
-
- return MCSectionMachO::Create(Segment, Section, TypeAndAttributes, Reserved2,
- Kind, getContext());
+ // 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;
+
+ // 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("__TEXT", "__text",
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
SectionKind::getText());
DataSection // .data
= getMachOSection("__DATA", "__data", 0, SectionKind::getDataRel());
-
+
CStringSection // .cstring
= getMachOSection("__TEXT", "__cstring", MCSectionMachO::S_CSTRING_LITERALS,
SectionKind::getMergeable1ByteCString());
EightByteConstantSection // .literal8
= getMachOSection("__TEXT", "__literal8", MCSectionMachO::S_8BYTE_LITERALS,
SectionKind::getMergeableConst8());
-
+
// ld_classic doesn't support .literal16 in 32-bit mode, and ld64 falls back
// to using it in -static mode.
SixteenByteConstantSection = 0;
SixteenByteConstantSection = // .literal16
getMachOSection("__TEXT", "__literal16",MCSectionMachO::S_16BYTE_LITERALS,
SectionKind::getMergeableConst16());
-
+
ReadOnlySection // .const
= getMachOSection("__TEXT", "__const", 0, SectionKind::getReadOnly());
-
+
TextCoalSection
= getMachOSection("__TEXT", "__textcoal_nt",
MCSectionMachO::S_COALESCED |
= 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());
MCSectionMachO::S_MOD_INIT_FUNC_POINTERS,
SectionKind::getDataRel());
StaticDtorSection
- = getMachOSection("__DATA", "__mod_term_func",
+ = getMachOSection("__DATA", "__mod_term_func",
MCSectionMachO::S_MOD_TERM_FUNC_POINTERS,
SectionKind::getDataRel());
}
-
+
// Exception Handling.
LSDASection = getMachOSection("__DATA", "__gcc_except_tab", 0,
SectionKind::getDataRel());
SectionKind::getReadOnly());
// Debug Information.
- DwarfAbbrevSection =
+ DwarfAbbrevSection =
getMachOSection("__DWARF", "__debug_abbrev", MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
- DwarfInfoSection =
+ DwarfInfoSection =
getMachOSection("__DWARF", "__debug_info", MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
- DwarfLineSection =
+ DwarfLineSection =
getMachOSection("__DWARF", "__debug_line", MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
- DwarfFrameSection =
+ DwarfFrameSection =
getMachOSection("__DWARF", "__debug_frame", MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
- DwarfPubNamesSection =
+ DwarfPubNamesSection =
getMachOSection("__DWARF", "__debug_pubnames", MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
- DwarfPubTypesSection =
+ DwarfPubTypesSection =
getMachOSection("__DWARF", "__debug_pubtypes", MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
- DwarfStrSection =
+ DwarfStrSection =
getMachOSection("__DWARF", "__debug_str", MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
- DwarfLocSection =
+ DwarfLocSection =
getMachOSection("__DWARF", "__debug_loc", MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
- DwarfARangesSection =
+ DwarfARangesSection =
getMachOSection("__DWARF", "__debug_aranges", MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
- DwarfRangesSection =
+ DwarfRangesSection =
getMachOSection("__DWARF", "__debug_ranges", MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
- DwarfMacroInfoSection =
+ DwarfMacroInfoSection =
getMachOSection("__DWARF", "__debug_macinfo", MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
- DwarfDebugInlineSection =
+ DwarfDebugInlineSection =
getMachOSection("__DWARF", "__debug_inlined", MCSectionMachO::S_ATTR_DEBUG,
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,
+getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler *Mang, const TargetMachine &TM) const {
// Parse the section specifier and create it if valid.
StringRef Segment, Section;
std::string ErrorCode =
MCSectionMachO::ParseSectionSpecifier(GV->getSection(), Segment, Section,
TAA, StubSize);
- if (ErrorCode.empty())
- return 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;
+ 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);
+
+ // 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::
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()) {
return ConstTextCoalSection;
return DataCoalSection;
}
-
+
// FIXME: Alignment check should be handled by section classifier.
if (Kind.isMergeable1ByteCString() ||
Kind.isMergeable2ByteCString()) {
return UStringSection;
}
}
-
+
if (Kind.isMergeableConst()) {
if (Kind.isMergeableConst4())
return FourByteConstantSection;
// 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.
return DataSection;
}
// segment, not in the text segment.
if (Kind.isDataRel())
return ConstDataSection;
-
+
if (Kind.isMergeableConst4())
return FourByteConstantSection;
if (Kind.isMergeableConst8())
/// 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
if (Name[0] == 'L' || Name[0] == 'l')
return false;
}
-
+
return true;
}
+const MCExpr *TargetLoweringObjectFileMachO::
+getSymbolForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
+ MachineModuleInfo *MMI,
+ bool &IsIndirect, bool &IsPCRel) const {
+ // The mach-o version of this method defaults to returning a stub reference.
+ IsIndirect = true;
+ IsPCRel = false;
+
+ SmallString<128> Name;
+ Mang->getNameWithPrefix(Name, GV, true);
+ Name += "$non_lazy_ptr";
+ return MCSymbolRefExpr::Create(Name.str(), getContext());
+}
+
//===----------------------------------------------------------------------===//
// 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());
getCOFFSection(".ctors", false, 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.
- DwarfAbbrevSection =
+ DwarfAbbrevSection =
getCOFFSection("\t.section\t.debug_abbrev,\"dr\"",
true, SectionKind::getMetadata());
- DwarfInfoSection =
+ DwarfInfoSection =
getCOFFSection("\t.section\t.debug_info,\"dr\"",
true, SectionKind::getMetadata());
- DwarfLineSection =
+ DwarfLineSection =
getCOFFSection("\t.section\t.debug_line,\"dr\"",
true, SectionKind::getMetadata());
- DwarfFrameSection =
+ DwarfFrameSection =
getCOFFSection("\t.section\t.debug_frame,\"dr\"",
true, SectionKind::getMetadata());
DwarfPubNamesSection =
DwarfPubTypesSection =
getCOFFSection("\t.section\t.debug_pubtypes,\"dr\"",
true, SectionKind::getMetadata());
- DwarfStrSection =
+ DwarfStrSection =
getCOFFSection("\t.section\t.debug_str,\"dr\"",
true, SectionKind::getMetadata());
- DwarfLocSection =
+ DwarfLocSection =
getCOFFSection("\t.section\t.debug_loc,\"dr\"",
true, SectionKind::getMetadata());
- DwarfARangesSection =
+ DwarfARangesSection =
getCOFFSection("\t.section\t.debug_aranges,\"dr\"",
true, SectionKind::getMetadata());
- DwarfRangesSection =
+ DwarfRangesSection =
getCOFFSection("\t.section\t.debug_ranges,\"dr\"",
true, SectionKind::getMetadata());
- DwarfMacroInfoSection =
+ DwarfMacroInfoSection =
getCOFFSection("\t.section\t.debug_macinfo,\"dr\"",
true, SectionKind::getMetadata());
}
const MCSection *TargetLoweringObjectFileCOFF::
-getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
+getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler *Mang, const TargetMachine &TM) const {
return getCOFFSection(GV->getSection().c_str(), false, Kind);
}
SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler *Mang, const TargetMachine &TM) const {
assert(!Kind.isThreadLocal() && "Doesn't support TLS");
-
+
// 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()) {
std::string Name = Mang->makeNameProper(GV->getNameStr());
return getCOFFSection((Prefix+Name).c_str(), false, Kind);
}
-
+
if (Kind.isText())
return getTextSection();
-
+
return getDataSection();
}
projects / oota-llvm.git / blobdiff