mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-31 12:30:06 +00:00
this. XFAIL'd, because the COFF AsmParser can't handle .section yet. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132220 91177308-0d34-0410-b5e6-96231b3b80d8
1116 lines
44 KiB
C++
1116 lines
44 KiB
C++
//===-- llvm/CodeGen/TargetLoweringObjectFileImpl.cpp - Object File Info --===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements classes used to handle lowerings specific to common
|
|
// object file formats.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
|
|
#include "llvm/Constants.h"
|
|
#include "llvm/DerivedTypes.h"
|
|
#include "llvm/Function.h"
|
|
#include "llvm/GlobalVariable.h"
|
|
#include "llvm/CodeGen/MachineModuleInfoImpls.h"
|
|
#include "llvm/MC/MCContext.h"
|
|
#include "llvm/MC/MCExpr.h"
|
|
#include "llvm/MC/MCSectionMachO.h"
|
|
#include "llvm/MC/MCSectionELF.h"
|
|
#include "llvm/MC/MCSectionCOFF.h"
|
|
#include "llvm/MC/MCStreamer.h"
|
|
#include "llvm/MC/MCSymbol.h"
|
|
#include "llvm/Target/Mangler.h"
|
|
#include "llvm/Target/TargetData.h"
|
|
#include "llvm/Target/TargetMachine.h"
|
|
#include "llvm/Target/TargetOptions.h"
|
|
#include "llvm/Support/Dwarf.h"
|
|
#include "llvm/Support/ELF.h"
|
|
#include "llvm/Support/ErrorHandling.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
#include "llvm/ADT/SmallString.h"
|
|
#include "llvm/ADT/StringExtras.h"
|
|
#include "llvm/ADT/Triple.h"
|
|
using namespace llvm;
|
|
using namespace dwarf;
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// ELF
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
void TargetLoweringObjectFileELF::Initialize(MCContext &Ctx,
|
|
const TargetMachine &TM) {
|
|
TargetLoweringObjectFile::Initialize(Ctx, TM);
|
|
|
|
BSSSection =
|
|
getContext().getELFSection(".bss", ELF::SHT_NOBITS,
|
|
ELF::SHF_WRITE |ELF::SHF_ALLOC,
|
|
SectionKind::getBSS());
|
|
|
|
TextSection =
|
|
getContext().getELFSection(".text", ELF::SHT_PROGBITS,
|
|
ELF::SHF_EXECINSTR |
|
|
ELF::SHF_ALLOC,
|
|
SectionKind::getText());
|
|
|
|
DataSection =
|
|
getContext().getELFSection(".data", ELF::SHT_PROGBITS,
|
|
ELF::SHF_WRITE |ELF::SHF_ALLOC,
|
|
SectionKind::getDataRel());
|
|
|
|
ReadOnlySection =
|
|
getContext().getELFSection(".rodata", ELF::SHT_PROGBITS,
|
|
ELF::SHF_ALLOC,
|
|
SectionKind::getReadOnly());
|
|
|
|
TLSDataSection =
|
|
getContext().getELFSection(".tdata", ELF::SHT_PROGBITS,
|
|
ELF::SHF_ALLOC | ELF::SHF_TLS |
|
|
ELF::SHF_WRITE,
|
|
SectionKind::getThreadData());
|
|
|
|
TLSBSSSection =
|
|
getContext().getELFSection(".tbss", ELF::SHT_NOBITS,
|
|
ELF::SHF_ALLOC | ELF::SHF_TLS |
|
|
ELF::SHF_WRITE,
|
|
SectionKind::getThreadBSS());
|
|
|
|
DataRelSection =
|
|
getContext().getELFSection(".data.rel", ELF::SHT_PROGBITS,
|
|
ELF::SHF_ALLOC |ELF::SHF_WRITE,
|
|
SectionKind::getDataRel());
|
|
|
|
DataRelLocalSection =
|
|
getContext().getELFSection(".data.rel.local", ELF::SHT_PROGBITS,
|
|
ELF::SHF_ALLOC |ELF::SHF_WRITE,
|
|
SectionKind::getDataRelLocal());
|
|
|
|
DataRelROSection =
|
|
getContext().getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
|
|
ELF::SHF_ALLOC |ELF::SHF_WRITE,
|
|
SectionKind::getReadOnlyWithRel());
|
|
|
|
DataRelROLocalSection =
|
|
getContext().getELFSection(".data.rel.ro.local", ELF::SHT_PROGBITS,
|
|
ELF::SHF_ALLOC |ELF::SHF_WRITE,
|
|
SectionKind::getReadOnlyWithRelLocal());
|
|
|
|
MergeableConst4Section =
|
|
getContext().getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
|
|
ELF::SHF_ALLOC |ELF::SHF_MERGE,
|
|
SectionKind::getMergeableConst4());
|
|
|
|
MergeableConst8Section =
|
|
getContext().getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
|
|
ELF::SHF_ALLOC |ELF::SHF_MERGE,
|
|
SectionKind::getMergeableConst8());
|
|
|
|
MergeableConst16Section =
|
|
getContext().getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
|
|
ELF::SHF_ALLOC |ELF::SHF_MERGE,
|
|
SectionKind::getMergeableConst16());
|
|
|
|
StaticCtorSection =
|
|
getContext().getELFSection(".ctors", ELF::SHT_PROGBITS,
|
|
ELF::SHF_ALLOC |ELF::SHF_WRITE,
|
|
SectionKind::getDataRel());
|
|
|
|
StaticDtorSection =
|
|
getContext().getELFSection(".dtors", ELF::SHT_PROGBITS,
|
|
ELF::SHF_ALLOC |ELF::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 =
|
|
getContext().getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
|
|
ELF::SHF_ALLOC,
|
|
SectionKind::getReadOnly());
|
|
// Debug Info Sections.
|
|
DwarfAbbrevSection =
|
|
getContext().getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
|
|
SectionKind::getMetadata());
|
|
DwarfInfoSection =
|
|
getContext().getELFSection(".debug_info", ELF::SHT_PROGBITS, 0,
|
|
SectionKind::getMetadata());
|
|
DwarfLineSection =
|
|
getContext().getELFSection(".debug_line", ELF::SHT_PROGBITS, 0,
|
|
SectionKind::getMetadata());
|
|
DwarfFrameSection =
|
|
getContext().getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0,
|
|
SectionKind::getMetadata());
|
|
DwarfPubNamesSection =
|
|
getContext().getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0,
|
|
SectionKind::getMetadata());
|
|
DwarfPubTypesSection =
|
|
getContext().getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0,
|
|
SectionKind::getMetadata());
|
|
DwarfStrSection =
|
|
getContext().getELFSection(".debug_str", ELF::SHT_PROGBITS, 0,
|
|
SectionKind::getMetadata());
|
|
DwarfLocSection =
|
|
getContext().getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0,
|
|
SectionKind::getMetadata());
|
|
DwarfARangesSection =
|
|
getContext().getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0,
|
|
SectionKind::getMetadata());
|
|
DwarfRangesSection =
|
|
getContext().getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0,
|
|
SectionKind::getMetadata());
|
|
DwarfMacroInfoSection =
|
|
getContext().getELFSection(".debug_macinfo", ELF::SHT_PROGBITS, 0,
|
|
SectionKind::getMetadata());
|
|
}
|
|
|
|
const MCSection *TargetLoweringObjectFileELF::getEHFrameSection() const {
|
|
return getContext().getELFSection(".eh_frame", ELF::SHT_PROGBITS,
|
|
ELF::SHF_ALLOC,
|
|
SectionKind::getDataRel());
|
|
}
|
|
|
|
MCSymbol *
|
|
TargetLoweringObjectFileELF::getCFIPersonalitySymbol(const GlobalValue *GV,
|
|
Mangler *Mang,
|
|
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 Mang->getSymbol(GV);
|
|
break;
|
|
case dwarf::DW_EH_PE_pcrel: {
|
|
Twine FullName = StringRef("DW.ref.") + Mang->getSymbol(GV)->getName();
|
|
return getContext().GetOrCreateSymbol(FullName);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
void TargetLoweringObjectFileELF::emitPersonalityValue(MCStreamer &Streamer,
|
|
const TargetMachine &TM,
|
|
const MCSymbol *Sym) const {
|
|
Twine FullName = StringRef("DW.ref.") + Sym->getName();
|
|
MCSymbol *Label = getContext().GetOrCreateSymbol(FullName);
|
|
Streamer.EmitSymbolAttribute(Label, MCSA_Hidden);
|
|
Streamer.EmitSymbolAttribute(Label, MCSA_Weak);
|
|
Twine SectionName = StringRef(".data.") + Label->getName();
|
|
SmallString<64> NameData;
|
|
SectionName.toVector(NameData);
|
|
unsigned Flags = ELF::SHF_ALLOC | ELF::SHF_WRITE | ELF::SHF_GROUP;
|
|
const MCSection *Sec = getContext().getELFSection(NameData,
|
|
ELF::SHT_PROGBITS,
|
|
Flags,
|
|
SectionKind::getDataRel(),
|
|
0, Label->getName());
|
|
Streamer.SwitchSection(Sec);
|
|
Streamer.EmitValueToAlignment(8);
|
|
Streamer.EmitSymbolAttribute(Label, MCSA_ELF_TypeObject);
|
|
const MCExpr *E = MCConstantExpr::Create(8, getContext());
|
|
Streamer.EmitELFSize(Label, E);
|
|
Streamer.EmitLabel(Label);
|
|
|
|
unsigned Size = TM.getTargetData()->getPointerSize();
|
|
Streamer.EmitSymbolValue(Sym, Size);
|
|
}
|
|
|
|
static SectionKind
|
|
getELFKindForNamedSection(StringRef Name, SectionKind K) {
|
|
// N.B.: The defaults used in here are no the same ones used in MC.
|
|
// We follow gcc, MC follows gas. For example, given ".section .eh_frame",
|
|
// both gas and MC will produce a section with no flags. Given
|
|
// section(".eh_frame") gcc will produce
|
|
// .section .eh_frame,"a",@progbits
|
|
if (Name.empty() || Name[0] != '.') return K;
|
|
|
|
// Some lame default implementation based on some magic section names.
|
|
if (Name == ".bss" ||
|
|
Name.startswith(".bss.") ||
|
|
Name.startswith(".gnu.linkonce.b.") ||
|
|
Name.startswith(".llvm.linkonce.b.") ||
|
|
Name == ".sbss" ||
|
|
Name.startswith(".sbss.") ||
|
|
Name.startswith(".gnu.linkonce.sb.") ||
|
|
Name.startswith(".llvm.linkonce.sb."))
|
|
return SectionKind::getBSS();
|
|
|
|
if (Name == ".tdata" ||
|
|
Name.startswith(".tdata.") ||
|
|
Name.startswith(".gnu.linkonce.td.") ||
|
|
Name.startswith(".llvm.linkonce.td."))
|
|
return SectionKind::getThreadData();
|
|
|
|
if (Name == ".tbss" ||
|
|
Name.startswith(".tbss.") ||
|
|
Name.startswith(".gnu.linkonce.tb.") ||
|
|
Name.startswith(".llvm.linkonce.tb."))
|
|
return SectionKind::getThreadBSS();
|
|
|
|
if (Name == ".eh_frame")
|
|
return SectionKind::getReadOnlyWithRel();
|
|
|
|
return K;
|
|
}
|
|
|
|
|
|
static unsigned getELFSectionType(StringRef Name, SectionKind K) {
|
|
|
|
if (Name == ".init_array")
|
|
return ELF::SHT_INIT_ARRAY;
|
|
|
|
if (Name == ".fini_array")
|
|
return ELF::SHT_FINI_ARRAY;
|
|
|
|
if (Name == ".preinit_array")
|
|
return ELF::SHT_PREINIT_ARRAY;
|
|
|
|
if (K.isBSS() || K.isThreadBSS())
|
|
return ELF::SHT_NOBITS;
|
|
|
|
return ELF::SHT_PROGBITS;
|
|
}
|
|
|
|
|
|
static unsigned
|
|
getELFSectionFlags(SectionKind K) {
|
|
unsigned Flags = 0;
|
|
|
|
if (!K.isMetadata())
|
|
Flags |= ELF::SHF_ALLOC;
|
|
|
|
if (K.isText())
|
|
Flags |= ELF::SHF_EXECINSTR;
|
|
|
|
if (K.isWriteable() && !K.isReadOnlyWithRel())
|
|
Flags |= ELF::SHF_WRITE;
|
|
|
|
if (K.isThreadLocal())
|
|
Flags |= ELF::SHF_TLS;
|
|
|
|
// K.isMergeableConst() is left out to honour PR4650
|
|
if (K.isMergeableCString() || K.isMergeableConst4() ||
|
|
K.isMergeableConst8() || K.isMergeableConst16())
|
|
Flags |= ELF::SHF_MERGE;
|
|
|
|
if (K.isMergeableCString())
|
|
Flags |= ELF::SHF_STRINGS;
|
|
|
|
return Flags;
|
|
}
|
|
|
|
|
|
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);
|
|
|
|
return getContext().getELFSection(SectionName,
|
|
getELFSectionType(SectionName, Kind),
|
|
getELFSectionFlags(Kind), Kind);
|
|
}
|
|
|
|
/// 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.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 {
|
|
// 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() && !Kind.isBSS()) {
|
|
const char *Prefix;
|
|
Prefix = getSectionPrefixForGlobal(Kind);
|
|
|
|
SmallString<128> Name(Prefix, Prefix+strlen(Prefix));
|
|
MCSymbol *Sym = Mang->getSymbol(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;
|
|
}
|
|
|
|
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()) {
|
|
|
|
// We also need alignment here.
|
|
// FIXME: this is getting the alignment of the character, not the
|
|
// alignment of the global!
|
|
unsigned Align =
|
|
TM.getTargetData()->getPreferredAlignment(cast<GlobalVariable>(GV));
|
|
|
|
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);
|
|
}
|
|
|
|
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 (Kind.isReadOnly()) return ReadOnlySection;
|
|
|
|
if (Kind.isThreadData()) return TLSDataSection;
|
|
if (Kind.isThreadBSS()) return TLSBSSSection;
|
|
|
|
// 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;
|
|
|
|
if (Kind.isDataNoRel()) return DataSection;
|
|
if (Kind.isDataRelLocal()) return DataRelLocalSection;
|
|
if (Kind.isDataRel()) return DataRelSection;
|
|
if (Kind.isReadOnlyWithRelLocal()) return DataRelROLocalSection;
|
|
|
|
assert(Kind.isReadOnlyWithRel() && "Unknown section kind");
|
|
return DataRelROSection;
|
|
}
|
|
|
|
/// getSectionForConstant - Given a mergeable constant with the
|
|
/// specified size and relocation information, return a section that it
|
|
/// should be placed in.
|
|
const MCSection *TargetLoweringObjectFileELF::
|
|
getSectionForConstant(SectionKind Kind) const {
|
|
if (Kind.isMergeableConst4() && MergeableConst4Section)
|
|
return MergeableConst4Section;
|
|
if (Kind.isMergeableConst8() && MergeableConst8Section)
|
|
return MergeableConst8Section;
|
|
if (Kind.isMergeableConst16() && MergeableConst16Section)
|
|
return MergeableConst16Section;
|
|
if (Kind.isReadOnly())
|
|
return ReadOnlySection;
|
|
|
|
if (Kind.isReadOnlyWithRelLocal()) return DataRelROLocalSection;
|
|
assert(Kind.isReadOnlyWithRel() && "Unknown section kind");
|
|
return DataRelROSection;
|
|
}
|
|
|
|
const MCExpr *TargetLoweringObjectFileELF::
|
|
getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
|
|
MachineModuleInfo *MMI,
|
|
unsigned Encoding, 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";
|
|
|
|
// 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 = Mang->getSymbol(GV);
|
|
StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage());
|
|
}
|
|
|
|
return TargetLoweringObjectFile::
|
|
getExprForDwarfReference(SSym, Encoding & ~dwarf::DW_EH_PE_indirect, Streamer);
|
|
}
|
|
|
|
return TargetLoweringObjectFile::
|
|
getExprForDwarfGlobalReference(GV, Mang, MMI, Encoding, Streamer);
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// MachO
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
void TargetLoweringObjectFileMachO::Initialize(MCContext &Ctx,
|
|
const TargetMachine &TM) {
|
|
IsFunctionEHFrameSymbolPrivate = false;
|
|
SupportsWeakOmittedEHFrame = false;
|
|
|
|
// .comm doesn't support alignment before Leopard.
|
|
Triple T(((LLVMTargetMachine&)TM).getTargetTriple());
|
|
if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5))
|
|
CommDirectiveSupportsAlignment = false;
|
|
|
|
TargetLoweringObjectFile::Initialize(Ctx, TM);
|
|
|
|
TextSection // .text
|
|
= getContext().getMachOSection("__TEXT", "__text",
|
|
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
|
|
SectionKind::getText());
|
|
DataSection // .data
|
|
= getContext().getMachOSection("__DATA", "__data", 0,
|
|
SectionKind::getDataRel());
|
|
|
|
TLSDataSection // .tdata
|
|
= getContext().getMachOSection("__DATA", "__thread_data",
|
|
MCSectionMachO::S_THREAD_LOCAL_REGULAR,
|
|
SectionKind::getDataRel());
|
|
TLSBSSSection // .tbss
|
|
= getContext().getMachOSection("__DATA", "__thread_bss",
|
|
MCSectionMachO::S_THREAD_LOCAL_ZEROFILL,
|
|
SectionKind::getThreadBSS());
|
|
|
|
// TODO: Verify datarel below.
|
|
TLSTLVSection // .tlv
|
|
= getContext().getMachOSection("__DATA", "__thread_vars",
|
|
MCSectionMachO::S_THREAD_LOCAL_VARIABLES,
|
|
SectionKind::getDataRel());
|
|
|
|
TLSThreadInitSection
|
|
= getContext().getMachOSection("__DATA", "__thread_init",
|
|
MCSectionMachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS,
|
|
SectionKind::getDataRel());
|
|
|
|
CStringSection // .cstring
|
|
= getContext().getMachOSection("__TEXT", "__cstring",
|
|
MCSectionMachO::S_CSTRING_LITERALS,
|
|
SectionKind::getMergeable1ByteCString());
|
|
UStringSection
|
|
= getContext().getMachOSection("__TEXT","__ustring", 0,
|
|
SectionKind::getMergeable2ByteCString());
|
|
FourByteConstantSection // .literal4
|
|
= getContext().getMachOSection("__TEXT", "__literal4",
|
|
MCSectionMachO::S_4BYTE_LITERALS,
|
|
SectionKind::getMergeableConst4());
|
|
EightByteConstantSection // .literal8
|
|
= getContext().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;
|
|
if (TM.getRelocationModel() != Reloc::Static &&
|
|
TM.getTargetData()->getPointerSize() == 32)
|
|
SixteenByteConstantSection = // .literal16
|
|
getContext().getMachOSection("__TEXT", "__literal16",
|
|
MCSectionMachO::S_16BYTE_LITERALS,
|
|
SectionKind::getMergeableConst16());
|
|
|
|
ReadOnlySection // .const
|
|
= getContext().getMachOSection("__TEXT", "__const", 0,
|
|
SectionKind::getReadOnly());
|
|
|
|
TextCoalSection
|
|
= getContext().getMachOSection("__TEXT", "__textcoal_nt",
|
|
MCSectionMachO::S_COALESCED |
|
|
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
|
|
SectionKind::getText());
|
|
ConstTextCoalSection
|
|
= getContext().getMachOSection("__TEXT", "__const_coal",
|
|
MCSectionMachO::S_COALESCED,
|
|
SectionKind::getReadOnly());
|
|
ConstDataSection // .const_data
|
|
= getContext().getMachOSection("__DATA", "__const", 0,
|
|
SectionKind::getReadOnlyWithRel());
|
|
DataCoalSection
|
|
= getContext().getMachOSection("__DATA","__datacoal_nt",
|
|
MCSectionMachO::S_COALESCED,
|
|
SectionKind::getDataRel());
|
|
DataCommonSection
|
|
= getContext().getMachOSection("__DATA","__common",
|
|
MCSectionMachO::S_ZEROFILL,
|
|
SectionKind::getBSS());
|
|
DataBSSSection
|
|
= getContext().getMachOSection("__DATA","__bss", MCSectionMachO::S_ZEROFILL,
|
|
SectionKind::getBSS());
|
|
|
|
|
|
LazySymbolPointerSection
|
|
= getContext().getMachOSection("__DATA", "__la_symbol_ptr",
|
|
MCSectionMachO::S_LAZY_SYMBOL_POINTERS,
|
|
SectionKind::getMetadata());
|
|
NonLazySymbolPointerSection
|
|
= getContext().getMachOSection("__DATA", "__nl_symbol_ptr",
|
|
MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS,
|
|
SectionKind::getMetadata());
|
|
|
|
if (TM.getRelocationModel() == Reloc::Static) {
|
|
StaticCtorSection
|
|
= getContext().getMachOSection("__TEXT", "__constructor", 0,
|
|
SectionKind::getDataRel());
|
|
StaticDtorSection
|
|
= getContext().getMachOSection("__TEXT", "__destructor", 0,
|
|
SectionKind::getDataRel());
|
|
} else {
|
|
StaticCtorSection
|
|
= getContext().getMachOSection("__DATA", "__mod_init_func",
|
|
MCSectionMachO::S_MOD_INIT_FUNC_POINTERS,
|
|
SectionKind::getDataRel());
|
|
StaticDtorSection
|
|
= getContext().getMachOSection("__DATA", "__mod_term_func",
|
|
MCSectionMachO::S_MOD_TERM_FUNC_POINTERS,
|
|
SectionKind::getDataRel());
|
|
}
|
|
|
|
// Exception Handling.
|
|
LSDASection = getContext().getMachOSection("__TEXT", "__gcc_except_tab", 0,
|
|
SectionKind::getReadOnlyWithRel());
|
|
// Debug Information.
|
|
DwarfAbbrevSection =
|
|
getContext().getMachOSection("__DWARF", "__debug_abbrev",
|
|
MCSectionMachO::S_ATTR_DEBUG,
|
|
SectionKind::getMetadata());
|
|
DwarfInfoSection =
|
|
getContext().getMachOSection("__DWARF", "__debug_info",
|
|
MCSectionMachO::S_ATTR_DEBUG,
|
|
SectionKind::getMetadata());
|
|
DwarfLineSection =
|
|
getContext().getMachOSection("__DWARF", "__debug_line",
|
|
MCSectionMachO::S_ATTR_DEBUG,
|
|
SectionKind::getMetadata());
|
|
DwarfFrameSection =
|
|
getContext().getMachOSection("__DWARF", "__debug_frame",
|
|
MCSectionMachO::S_ATTR_DEBUG,
|
|
SectionKind::getMetadata());
|
|
DwarfPubNamesSection =
|
|
getContext().getMachOSection("__DWARF", "__debug_pubnames",
|
|
MCSectionMachO::S_ATTR_DEBUG,
|
|
SectionKind::getMetadata());
|
|
DwarfPubTypesSection =
|
|
getContext().getMachOSection("__DWARF", "__debug_pubtypes",
|
|
MCSectionMachO::S_ATTR_DEBUG,
|
|
SectionKind::getMetadata());
|
|
DwarfStrSection =
|
|
getContext().getMachOSection("__DWARF", "__debug_str",
|
|
MCSectionMachO::S_ATTR_DEBUG,
|
|
SectionKind::getMetadata());
|
|
DwarfLocSection =
|
|
getContext().getMachOSection("__DWARF", "__debug_loc",
|
|
MCSectionMachO::S_ATTR_DEBUG,
|
|
SectionKind::getMetadata());
|
|
DwarfARangesSection =
|
|
getContext().getMachOSection("__DWARF", "__debug_aranges",
|
|
MCSectionMachO::S_ATTR_DEBUG,
|
|
SectionKind::getMetadata());
|
|
DwarfRangesSection =
|
|
getContext().getMachOSection("__DWARF", "__debug_ranges",
|
|
MCSectionMachO::S_ATTR_DEBUG,
|
|
SectionKind::getMetadata());
|
|
DwarfMacroInfoSection =
|
|
getContext().getMachOSection("__DWARF", "__debug_macinfo",
|
|
MCSectionMachO::S_ATTR_DEBUG,
|
|
SectionKind::getMetadata());
|
|
DwarfDebugInlineSection =
|
|
getContext().getMachOSection("__DWARF", "__debug_inlined",
|
|
MCSectionMachO::S_ATTR_DEBUG,
|
|
SectionKind::getMetadata());
|
|
|
|
TLSExtraDataSection = TLSTLVSection;
|
|
}
|
|
|
|
const MCSection *TargetLoweringObjectFileMachO::getEHFrameSection() const {
|
|
return getContext().getMachOSection("__TEXT", "__eh_frame",
|
|
MCSectionMachO::S_COALESCED |
|
|
MCSectionMachO::S_ATTR_NO_TOC |
|
|
MCSectionMachO::S_ATTR_STRIP_STATIC_SYMS |
|
|
MCSectionMachO::S_ATTR_LIVE_SUPPORT,
|
|
SectionKind::getReadOnly());
|
|
}
|
|
|
|
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;
|
|
std::string ErrorCode =
|
|
MCSectionMachO::ParseSectionSpecifier(GV->getSection(), Segment, Section,
|
|
TAA, TAAParsed, StubSize);
|
|
if (!ErrorCode.empty()) {
|
|
// If invalid, report the error with report_fatal_error.
|
|
report_fatal_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 =
|
|
getContext().getMachOSection(Segment, Section, TAA, StubSize, Kind);
|
|
|
|
// If TAA wasn't set by ParseSectionSpecifier() above,
|
|
// use the value returned by getMachOSection() as a default.
|
|
if (!TAAParsed)
|
|
TAA = S->getTypeAndAttributes();
|
|
|
|
// 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 report_fatal_error.
|
|
report_fatal_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 {
|
|
|
|
// Handle thread local data.
|
|
if (Kind.isThreadBSS()) return TLSBSSSection;
|
|
if (Kind.isThreadData()) return TLSDataSection;
|
|
|
|
if (Kind.isText())
|
|
return GV->isWeakForLinker() ? TextCoalSection : TextSection;
|
|
|
|
// If this is weak/linkonce, put this in a coalescable section, either in text
|
|
// or data depending on if it is writable.
|
|
if (GV->isWeakForLinker()) {
|
|
if (Kind.isReadOnly())
|
|
return ConstTextCoalSection;
|
|
return DataCoalSection;
|
|
}
|
|
|
|
// FIXME: Alignment check should be handled by section classifier.
|
|
if (Kind.isMergeable1ByteCString() &&
|
|
TM.getTargetData()->getPreferredAlignment(cast<GlobalVariable>(GV)) < 32)
|
|
return CStringSection;
|
|
|
|
// Do not put 16-bit arrays in the UString section if they have an
|
|
// externally visible label, this runs into issues with certain linker
|
|
// versions.
|
|
if (Kind.isMergeable2ByteCString() && !GV->hasExternalLinkage() &&
|
|
TM.getTargetData()->getPreferredAlignment(cast<GlobalVariable>(GV)) < 32)
|
|
return UStringSection;
|
|
|
|
if (Kind.isMergeableConst()) {
|
|
if (Kind.isMergeableConst4())
|
|
return FourByteConstantSection;
|
|
if (Kind.isMergeableConst8())
|
|
return EightByteConstantSection;
|
|
if (Kind.isMergeableConst16() && SixteenByteConstantSection)
|
|
return SixteenByteConstantSection;
|
|
}
|
|
|
|
// Otherwise, if it is readonly, but not something we can specially optimize,
|
|
// just drop it in .const.
|
|
if (Kind.isReadOnly())
|
|
return ReadOnlySection;
|
|
|
|
// If this is marked const, put it into a const section. But if the dynamic
|
|
// linker needs to write to it, put it in the data segment.
|
|
if (Kind.isReadOnlyWithRel())
|
|
return ConstDataSection;
|
|
|
|
// Put zero initialized globals with strong external linkage in the
|
|
// DATA, __common section with the .zerofill directive.
|
|
if (Kind.isBSSExtern())
|
|
return DataCommonSection;
|
|
|
|
// Put zero initialized globals with local linkage in __DATA,__bss directive
|
|
// with the .zerofill directive (aka .lcomm).
|
|
if (Kind.isBSSLocal())
|
|
return DataBSSSection;
|
|
|
|
// Otherwise, just drop the variable in the normal data section.
|
|
return DataSection;
|
|
}
|
|
|
|
const MCSection *
|
|
TargetLoweringObjectFileMachO::getSectionForConstant(SectionKind Kind) 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 ConstDataSection;
|
|
|
|
if (Kind.isMergeableConst4())
|
|
return FourByteConstantSection;
|
|
if (Kind.isMergeableConst8())
|
|
return EightByteConstantSection;
|
|
if (Kind.isMergeableConst16() && SixteenByteConstantSection)
|
|
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 = Mang->getSymbol(GV);
|
|
if (Sym->getName()[0] == 'L' || Sym->getName()[0] == 'l')
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
const MCExpr *TargetLoweringObjectFileMachO::
|
|
getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
|
|
MachineModuleInfo *MMI, unsigned Encoding,
|
|
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 += "$non_lazy_ptr";
|
|
|
|
// Add information about the stub reference to MachOMMI so that the stub
|
|
// gets emitted by the asmprinter.
|
|
MCSymbol *SSym = getContext().GetOrCreateSymbol(Name.str());
|
|
MachineModuleInfoImpl::StubValueTy &StubSym = MachOMMI.getGVStubEntry(SSym);
|
|
if (StubSym.getPointer() == 0) {
|
|
MCSymbol *Sym = Mang->getSymbol(GV);
|
|
StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage());
|
|
}
|
|
|
|
return TargetLoweringObjectFile::
|
|
getExprForDwarfReference(SSym, Encoding & ~dwarf::DW_EH_PE_indirect, Streamer);
|
|
}
|
|
|
|
return TargetLoweringObjectFile::
|
|
getExprForDwarfGlobalReference(GV, Mang, MMI, Encoding, Streamer);
|
|
}
|
|
|
|
MCSymbol *TargetLoweringObjectFileMachO::
|
|
getCFIPersonalitySymbol(const GlobalValue *GV, Mangler *Mang,
|
|
MachineModuleInfo *MMI) const {
|
|
// The mach-o version of this method defaults to returning a stub reference.
|
|
MachineModuleInfoMachO &MachOMMI =
|
|
MMI->getObjFileInfo<MachineModuleInfoMachO>();
|
|
|
|
SmallString<128> Name;
|
|
Mang->getNameWithPrefix(Name, GV, true);
|
|
Name += "$non_lazy_ptr";
|
|
|
|
// 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 = Mang->getSymbol(GV);
|
|
StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage());
|
|
}
|
|
|
|
return SSym;
|
|
}
|
|
|
|
unsigned TargetLoweringObjectFileMachO::getPersonalityEncoding() const {
|
|
return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
|
|
}
|
|
|
|
unsigned TargetLoweringObjectFileMachO::getLSDAEncoding() const {
|
|
return DW_EH_PE_pcrel;
|
|
}
|
|
|
|
unsigned TargetLoweringObjectFileMachO::getFDEEncoding(bool CFI) const {
|
|
return DW_EH_PE_pcrel;
|
|
}
|
|
|
|
unsigned TargetLoweringObjectFileMachO::getTTypeEncoding() const {
|
|
return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// COFF
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
void TargetLoweringObjectFileCOFF::Initialize(MCContext &Ctx,
|
|
const TargetMachine &TM) {
|
|
TargetLoweringObjectFile::Initialize(Ctx, TM);
|
|
TextSection =
|
|
getContext().getCOFFSection(".text",
|
|
COFF::IMAGE_SCN_CNT_CODE |
|
|
COFF::IMAGE_SCN_MEM_EXECUTE |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getText());
|
|
DataSection =
|
|
getContext().getCOFFSection(".data",
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ |
|
|
COFF::IMAGE_SCN_MEM_WRITE,
|
|
SectionKind::getDataRel());
|
|
ReadOnlySection =
|
|
getContext().getCOFFSection(".rdata",
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getReadOnly());
|
|
StaticCtorSection =
|
|
getContext().getCOFFSection(".ctors",
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ |
|
|
COFF::IMAGE_SCN_MEM_WRITE,
|
|
SectionKind::getDataRel());
|
|
StaticDtorSection =
|
|
getContext().getCOFFSection(".dtors",
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ |
|
|
COFF::IMAGE_SCN_MEM_WRITE,
|
|
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 =
|
|
getContext().getCOFFSection(".gcc_except_table",
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getReadOnly());
|
|
// Debug info.
|
|
DwarfAbbrevSection =
|
|
getContext().getCOFFSection(".debug_abbrev",
|
|
COFF::IMAGE_SCN_MEM_DISCARDABLE |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getMetadata());
|
|
DwarfInfoSection =
|
|
getContext().getCOFFSection(".debug_info",
|
|
COFF::IMAGE_SCN_MEM_DISCARDABLE |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getMetadata());
|
|
DwarfLineSection =
|
|
getContext().getCOFFSection(".debug_line",
|
|
COFF::IMAGE_SCN_MEM_DISCARDABLE |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getMetadata());
|
|
DwarfFrameSection =
|
|
getContext().getCOFFSection(".debug_frame",
|
|
COFF::IMAGE_SCN_MEM_DISCARDABLE |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getMetadata());
|
|
DwarfPubNamesSection =
|
|
getContext().getCOFFSection(".debug_pubnames",
|
|
COFF::IMAGE_SCN_MEM_DISCARDABLE |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getMetadata());
|
|
DwarfPubTypesSection =
|
|
getContext().getCOFFSection(".debug_pubtypes",
|
|
COFF::IMAGE_SCN_MEM_DISCARDABLE |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getMetadata());
|
|
DwarfStrSection =
|
|
getContext().getCOFFSection(".debug_str",
|
|
COFF::IMAGE_SCN_MEM_DISCARDABLE |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getMetadata());
|
|
DwarfLocSection =
|
|
getContext().getCOFFSection(".debug_loc",
|
|
COFF::IMAGE_SCN_MEM_DISCARDABLE |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getMetadata());
|
|
DwarfARangesSection =
|
|
getContext().getCOFFSection(".debug_aranges",
|
|
COFF::IMAGE_SCN_MEM_DISCARDABLE |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getMetadata());
|
|
DwarfRangesSection =
|
|
getContext().getCOFFSection(".debug_ranges",
|
|
COFF::IMAGE_SCN_MEM_DISCARDABLE |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getMetadata());
|
|
DwarfMacroInfoSection =
|
|
getContext().getCOFFSection(".debug_macinfo",
|
|
COFF::IMAGE_SCN_MEM_DISCARDABLE |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getMetadata());
|
|
|
|
DrectveSection =
|
|
getContext().getCOFFSection(".drectve",
|
|
COFF::IMAGE_SCN_LNK_INFO,
|
|
SectionKind::getMetadata());
|
|
|
|
PDataSection =
|
|
getContext().getCOFFSection(".pdata",
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ |
|
|
COFF::IMAGE_SCN_MEM_WRITE,
|
|
SectionKind::getDataRel());
|
|
|
|
XDataSection =
|
|
getContext().getCOFFSection(".xdata",
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ |
|
|
COFF::IMAGE_SCN_MEM_WRITE,
|
|
SectionKind::getDataRel());
|
|
}
|
|
|
|
const MCSection *TargetLoweringObjectFileCOFF::getEHFrameSection() const {
|
|
return getContext().getCOFFSection(".eh_frame",
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ |
|
|
COFF::IMAGE_SCN_MEM_WRITE,
|
|
SectionKind::getDataRel());
|
|
}
|
|
|
|
const MCSection *TargetLoweringObjectFileCOFF::getWin64EHFuncTableSection(
|
|
StringRef suffix) const {
|
|
if (suffix == "")
|
|
return PDataSection;
|
|
return getContext().getCOFFSection((".pdata"+suffix).str(),
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ |
|
|
COFF::IMAGE_SCN_MEM_WRITE,
|
|
SectionKind::getDataRel());
|
|
}
|
|
|
|
const MCSection *TargetLoweringObjectFileCOFF::getWin64EHTableSection(
|
|
StringRef suffix) const {
|
|
if (suffix == "")
|
|
return XDataSection;
|
|
return getContext().getCOFFSection((".xdata"+suffix).str(),
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ |
|
|
COFF::IMAGE_SCN_MEM_WRITE,
|
|
SectionKind::getDataRel());
|
|
}
|
|
|
|
|
|
static unsigned
|
|
getCOFFSectionFlags(SectionKind K) {
|
|
unsigned Flags = 0;
|
|
|
|
if (K.isMetadata())
|
|
Flags |=
|
|
COFF::IMAGE_SCN_MEM_DISCARDABLE;
|
|
else if (K.isText())
|
|
Flags |=
|
|
COFF::IMAGE_SCN_MEM_EXECUTE |
|
|
COFF::IMAGE_SCN_MEM_READ |
|
|
COFF::IMAGE_SCN_CNT_CODE;
|
|
else if (K.isBSS ())
|
|
Flags |=
|
|
COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ |
|
|
COFF::IMAGE_SCN_MEM_WRITE;
|
|
else if (K.isReadOnly())
|
|
Flags |=
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ;
|
|
else if (K.isWriteable())
|
|
Flags |=
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ |
|
|
COFF::IMAGE_SCN_MEM_WRITE;
|
|
|
|
return Flags;
|
|
}
|
|
|
|
const MCSection *TargetLoweringObjectFileCOFF::
|
|
getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
|
|
Mangler *Mang, const TargetMachine &TM) const {
|
|
return getContext().getCOFFSection(GV->getSection(),
|
|
getCOFFSectionFlags(Kind),
|
|
Kind);
|
|
}
|
|
|
|
static const char *getCOFFSectionPrefixForUniqueGlobal(SectionKind Kind) {
|
|
if (Kind.isText())
|
|
return ".text$";
|
|
if (Kind.isBSS ())
|
|
return ".bss$";
|
|
if (Kind.isWriteable())
|
|
return ".data$";
|
|
return ".rdata$";
|
|
}
|
|
|
|
|
|
const MCSection *TargetLoweringObjectFileCOFF::
|
|
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()) {
|
|
const char *Prefix = getCOFFSectionPrefixForUniqueGlobal(Kind);
|
|
SmallString<128> Name(Prefix, Prefix+strlen(Prefix));
|
|
MCSymbol *Sym = Mang->getSymbol(GV);
|
|
Name.append(Sym->getName().begin() + 1, Sym->getName().end());
|
|
|
|
unsigned Characteristics = getCOFFSectionFlags(Kind);
|
|
|
|
Characteristics |= COFF::IMAGE_SCN_LNK_COMDAT;
|
|
|
|
return getContext().getCOFFSection(Name.str(), Characteristics,
|
|
COFF::IMAGE_COMDAT_SELECT_ANY, Kind);
|
|
}
|
|
|
|
if (Kind.isText())
|
|
return getTextSection();
|
|
|
|
return getDataSection();
|
|
}
|
|
|