2010-02-15 22:37:53 +00:00
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//===-- llvm/CodeGen/TargetLoweringObjectFileImpl.cpp - Object File Info --===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements classes used to handle lowerings specific to common
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// object file formats.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Function.h"
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#include "llvm/GlobalVariable.h"
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#include "llvm/CodeGen/MachineModuleInfoImpls.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCSectionMachO.h"
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#include "llvm/MC/MCSectionELF.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Target/Mangler.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/Support/Dwarf.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/StringExtras.h"
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using namespace llvm;
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2010-02-21 20:28:15 +00:00
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using namespace dwarf;
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2010-02-15 22:37:53 +00:00
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//===----------------------------------------------------------------------===//
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// ELF
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//===----------------------------------------------------------------------===//
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typedef StringMap<const MCSectionELF*> ELFUniqueMapTy;
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TargetLoweringObjectFileELF::~TargetLoweringObjectFileELF() {
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// If we have the section uniquing map, free it.
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delete (ELFUniqueMapTy*)UniquingMap;
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}
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const MCSection *TargetLoweringObjectFileELF::
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getELFSection(StringRef Section, unsigned Type, unsigned Flags,
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SectionKind Kind, bool IsExplicit) const {
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if (UniquingMap == 0)
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UniquingMap = new ELFUniqueMapTy();
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ELFUniqueMapTy &Map = *(ELFUniqueMapTy*)UniquingMap;
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// Do the lookup, if we have a hit, return it.
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2010-03-15 06:23:52 +00:00
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StringMapEntry<const MCSectionELF*> &Entry = Map.GetOrCreateValue(Section);
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if (Entry.getValue()) return Entry.getValue();
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2010-02-15 22:37:53 +00:00
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2010-03-15 06:23:52 +00:00
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MCSectionELF *Result = MCSectionELF::Create(Entry.getKey(), Type, Flags, Kind,
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IsExplicit, getContext());
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Entry.setValue(Result);
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return Result;
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2010-02-15 22:37:53 +00:00
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}
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void TargetLoweringObjectFileELF::Initialize(MCContext &Ctx,
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const TargetMachine &TM) {
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if (UniquingMap != 0)
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((ELFUniqueMapTy*)UniquingMap)->clear();
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TargetLoweringObjectFile::Initialize(Ctx, TM);
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BSSSection =
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getELFSection(".bss", MCSectionELF::SHT_NOBITS,
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MCSectionELF::SHF_WRITE | MCSectionELF::SHF_ALLOC,
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SectionKind::getBSS());
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TextSection =
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getELFSection(".text", MCSectionELF::SHT_PROGBITS,
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MCSectionELF::SHF_EXECINSTR | MCSectionELF::SHF_ALLOC,
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SectionKind::getText());
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DataSection =
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getELFSection(".data", MCSectionELF::SHT_PROGBITS,
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MCSectionELF::SHF_WRITE | MCSectionELF::SHF_ALLOC,
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SectionKind::getDataRel());
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ReadOnlySection =
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getELFSection(".rodata", MCSectionELF::SHT_PROGBITS,
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MCSectionELF::SHF_ALLOC,
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SectionKind::getReadOnly());
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TLSDataSection =
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getELFSection(".tdata", MCSectionELF::SHT_PROGBITS,
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MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_TLS |
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MCSectionELF::SHF_WRITE, SectionKind::getThreadData());
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TLSBSSSection =
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getELFSection(".tbss", MCSectionELF::SHT_NOBITS,
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MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_TLS |
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MCSectionELF::SHF_WRITE, SectionKind::getThreadBSS());
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DataRelSection =
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getELFSection(".data.rel", MCSectionELF::SHT_PROGBITS,
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MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE,
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SectionKind::getDataRel());
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DataRelLocalSection =
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getELFSection(".data.rel.local", MCSectionELF::SHT_PROGBITS,
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MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE,
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SectionKind::getDataRelLocal());
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DataRelROSection =
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getELFSection(".data.rel.ro", MCSectionELF::SHT_PROGBITS,
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MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE,
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SectionKind::getReadOnlyWithRel());
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DataRelROLocalSection =
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getELFSection(".data.rel.ro.local", MCSectionELF::SHT_PROGBITS,
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MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE,
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SectionKind::getReadOnlyWithRelLocal());
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MergeableConst4Section =
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getELFSection(".rodata.cst4", MCSectionELF::SHT_PROGBITS,
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MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_MERGE,
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SectionKind::getMergeableConst4());
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MergeableConst8Section =
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getELFSection(".rodata.cst8", MCSectionELF::SHT_PROGBITS,
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MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_MERGE,
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SectionKind::getMergeableConst8());
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MergeableConst16Section =
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getELFSection(".rodata.cst16", MCSectionELF::SHT_PROGBITS,
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MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_MERGE,
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SectionKind::getMergeableConst16());
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StaticCtorSection =
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getELFSection(".ctors", MCSectionELF::SHT_PROGBITS,
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MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE,
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SectionKind::getDataRel());
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StaticDtorSection =
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getELFSection(".dtors", MCSectionELF::SHT_PROGBITS,
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MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE,
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SectionKind::getDataRel());
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// Exception Handling Sections.
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// FIXME: We're emitting LSDA info into a readonly section on ELF, even though
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// it contains relocatable pointers. In PIC mode, this is probably a big
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// runtime hit for C++ apps. Either the contents of the LSDA need to be
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// adjusted or this should be a data section.
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LSDASection =
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getELFSection(".gcc_except_table", MCSectionELF::SHT_PROGBITS,
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MCSectionELF::SHF_ALLOC, SectionKind::getReadOnly());
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EHFrameSection =
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getELFSection(".eh_frame", MCSectionELF::SHT_PROGBITS,
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MCSectionELF::SHF_ALLOC | MCSectionELF::SHF_WRITE,
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SectionKind::getDataRel());
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// Debug Info Sections.
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DwarfAbbrevSection =
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getELFSection(".debug_abbrev", MCSectionELF::SHT_PROGBITS, 0,
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SectionKind::getMetadata());
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DwarfInfoSection =
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getELFSection(".debug_info", MCSectionELF::SHT_PROGBITS, 0,
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SectionKind::getMetadata());
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DwarfLineSection =
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getELFSection(".debug_line", MCSectionELF::SHT_PROGBITS, 0,
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SectionKind::getMetadata());
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DwarfFrameSection =
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getELFSection(".debug_frame", MCSectionELF::SHT_PROGBITS, 0,
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SectionKind::getMetadata());
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DwarfPubNamesSection =
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getELFSection(".debug_pubnames", MCSectionELF::SHT_PROGBITS, 0,
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SectionKind::getMetadata());
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DwarfPubTypesSection =
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getELFSection(".debug_pubtypes", MCSectionELF::SHT_PROGBITS, 0,
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SectionKind::getMetadata());
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DwarfStrSection =
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getELFSection(".debug_str", MCSectionELF::SHT_PROGBITS, 0,
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SectionKind::getMetadata());
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DwarfLocSection =
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getELFSection(".debug_loc", MCSectionELF::SHT_PROGBITS, 0,
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SectionKind::getMetadata());
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DwarfARangesSection =
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getELFSection(".debug_aranges", MCSectionELF::SHT_PROGBITS, 0,
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SectionKind::getMetadata());
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DwarfRangesSection =
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getELFSection(".debug_ranges", MCSectionELF::SHT_PROGBITS, 0,
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SectionKind::getMetadata());
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DwarfMacroInfoSection =
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getELFSection(".debug_macinfo", MCSectionELF::SHT_PROGBITS, 0,
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SectionKind::getMetadata());
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}
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static SectionKind
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getELFKindForNamedSection(StringRef Name, SectionKind K) {
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if (Name.empty() || Name[0] != '.') return K;
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// Some lame default implementation based on some magic section names.
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if (Name == ".bss" ||
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Name.startswith(".bss.") ||
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Name.startswith(".gnu.linkonce.b.") ||
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Name.startswith(".llvm.linkonce.b.") ||
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Name == ".sbss" ||
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Name.startswith(".sbss.") ||
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Name.startswith(".gnu.linkonce.sb.") ||
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Name.startswith(".llvm.linkonce.sb."))
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return SectionKind::getBSS();
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if (Name == ".tdata" ||
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Name.startswith(".tdata.") ||
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Name.startswith(".gnu.linkonce.td.") ||
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Name.startswith(".llvm.linkonce.td."))
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return SectionKind::getThreadData();
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if (Name == ".tbss" ||
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Name.startswith(".tbss.") ||
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Name.startswith(".gnu.linkonce.tb.") ||
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Name.startswith(".llvm.linkonce.tb."))
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return SectionKind::getThreadBSS();
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return K;
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}
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static unsigned getELFSectionType(StringRef Name, SectionKind K) {
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if (Name == ".init_array")
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return MCSectionELF::SHT_INIT_ARRAY;
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if (Name == ".fini_array")
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return MCSectionELF::SHT_FINI_ARRAY;
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if (Name == ".preinit_array")
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return MCSectionELF::SHT_PREINIT_ARRAY;
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if (K.isBSS() || K.isThreadBSS())
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return MCSectionELF::SHT_NOBITS;
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return MCSectionELF::SHT_PROGBITS;
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}
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static unsigned
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getELFSectionFlags(SectionKind K) {
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unsigned Flags = 0;
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if (!K.isMetadata())
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Flags |= MCSectionELF::SHF_ALLOC;
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if (K.isText())
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Flags |= MCSectionELF::SHF_EXECINSTR;
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if (K.isWriteable())
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Flags |= MCSectionELF::SHF_WRITE;
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if (K.isThreadLocal())
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Flags |= MCSectionELF::SHF_TLS;
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// K.isMergeableConst() is left out to honour PR4650
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if (K.isMergeableCString() || K.isMergeableConst4() ||
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K.isMergeableConst8() || K.isMergeableConst16())
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Flags |= MCSectionELF::SHF_MERGE;
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if (K.isMergeableCString())
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Flags |= MCSectionELF::SHF_STRINGS;
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return Flags;
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}
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const MCSection *TargetLoweringObjectFileELF::
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getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
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Mangler *Mang, const TargetMachine &TM) const {
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StringRef SectionName = GV->getSection();
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// Infer section flags from the section name if we can.
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Kind = getELFKindForNamedSection(SectionName, Kind);
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return getELFSection(SectionName,
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getELFSectionType(SectionName, Kind),
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getELFSectionFlags(Kind), Kind, true);
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}
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static const char *getSectionPrefixForUniqueGlobal(SectionKind Kind) {
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if (Kind.isText()) return ".gnu.linkonce.t.";
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if (Kind.isReadOnly()) return ".gnu.linkonce.r.";
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if (Kind.isThreadData()) return ".gnu.linkonce.td.";
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if (Kind.isThreadBSS()) return ".gnu.linkonce.tb.";
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if (Kind.isDataNoRel()) return ".gnu.linkonce.d.";
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if (Kind.isDataRelLocal()) return ".gnu.linkonce.d.rel.local.";
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if (Kind.isDataRel()) return ".gnu.linkonce.d.rel.";
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if (Kind.isReadOnlyWithRelLocal()) return ".gnu.linkonce.d.rel.ro.local.";
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assert(Kind.isReadOnlyWithRel() && "Unknown section kind");
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return ".gnu.linkonce.d.rel.ro.";
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}
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const MCSection *TargetLoweringObjectFileELF::
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SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
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Mangler *Mang, const TargetMachine &TM) const {
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// If this global is linkonce/weak and the target handles this by emitting it
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// into a 'uniqued' section name, create and return the section now.
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if (GV->isWeakForLinker() && !Kind.isCommon() && !Kind.isBSS()) {
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const char *Prefix = getSectionPrefixForUniqueGlobal(Kind);
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SmallString<128> Name(Prefix, Prefix+strlen(Prefix));
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MCSymbol *Sym = Mang->getSymbol(GV);
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Name.append(Sym->getName().begin(), Sym->getName().end());
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2010-02-15 22:37:53 +00:00
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return getELFSection(Name.str(), getELFSectionType(Name.str(), Kind),
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getELFSectionFlags(Kind), Kind);
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}
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if (Kind.isText()) return TextSection;
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if (Kind.isMergeable1ByteCString() ||
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Kind.isMergeable2ByteCString() ||
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Kind.isMergeable4ByteCString()) {
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// We also need alignment here.
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// FIXME: this is getting the alignment of the character, not the
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// alignment of the global!
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unsigned Align =
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TM.getTargetData()->getPreferredAlignment(cast<GlobalVariable>(GV));
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const char *SizeSpec = ".rodata.str1.";
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if (Kind.isMergeable2ByteCString())
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SizeSpec = ".rodata.str2.";
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else if (Kind.isMergeable4ByteCString())
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SizeSpec = ".rodata.str4.";
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else
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assert(Kind.isMergeable1ByteCString() && "unknown string width");
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std::string Name = SizeSpec + utostr(Align);
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|
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return getELFSection(Name, MCSectionELF::SHT_PROGBITS,
|
|
|
|
MCSectionELF::SHF_ALLOC |
|
|
|
|
MCSectionELF::SHF_MERGE |
|
|
|
|
MCSectionELF::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::
|
2010-03-11 19:41:58 +00:00
|
|
|
getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
|
|
|
|
MachineModuleInfo *MMI,
|
|
|
|
unsigned Encoding, MCStreamer &Streamer) const {
|
2010-02-15 22:37:53 +00:00
|
|
|
|
|
|
|
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.
|
2010-03-30 18:10:53 +00:00
|
|
|
MCSymbol *SSym = getContext().GetOrCreateSymbol(Name.str());
|
2010-03-15 20:37:38 +00:00
|
|
|
MachineModuleInfoImpl::StubValueTy &StubSym = ELFMMI.getGVStubEntry(SSym);
|
2010-03-10 22:34:10 +00:00
|
|
|
if (StubSym.getPointer() == 0) {
|
2010-03-15 20:37:38 +00:00
|
|
|
MCSymbol *Sym = Mang->getSymbol(GV);
|
|
|
|
StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage());
|
2010-02-15 22:37:53 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
return TargetLoweringObjectFile::
|
2010-03-15 20:37:38 +00:00
|
|
|
getExprForDwarfReference(SSym, Mang, MMI,
|
2010-03-11 19:41:58 +00:00
|
|
|
Encoding & ~dwarf::DW_EH_PE_indirect, Streamer);
|
2010-02-15 22:37:53 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
return TargetLoweringObjectFile::
|
2010-03-11 19:41:58 +00:00
|
|
|
getExprForDwarfGlobalReference(GV, Mang, MMI, Encoding, Streamer);
|
2010-02-15 22:37:53 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// MachO
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
|
|
|
|
|
|
|
|
const MCSectionMachO *TargetLoweringObjectFileMachO::
|
|
|
|
getMachOSection(StringRef Segment, StringRef Section,
|
|
|
|
unsigned TypeAndAttributes,
|
|
|
|
unsigned Reserved2, SectionKind Kind) const {
|
2010-04-08 20:30:37 +00:00
|
|
|
|
|
|
|
return getContext().getMachOSection(Segment, Section, TypeAndAttributes,
|
|
|
|
Reserved2, Kind);
|
2010-02-15 22:37:53 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void TargetLoweringObjectFileMachO::Initialize(MCContext &Ctx,
|
|
|
|
const TargetMachine &TM) {
|
2010-03-10 07:20:42 +00:00
|
|
|
// _foo.eh symbols are currently always exported so that the linker knows
|
|
|
|
// about them. This is not necessary on 10.6 and later, but it
|
|
|
|
// doesn't hurt anything.
|
|
|
|
// FIXME: I need to get this from Triple.
|
|
|
|
IsFunctionEHSymbolGlobal = true;
|
|
|
|
IsFunctionEHFrameSymbolPrivate = false;
|
|
|
|
SupportsWeakOmittedEHFrame = false;
|
|
|
|
|
2010-02-15 22:37:53 +00:00
|
|
|
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());
|
|
|
|
UStringSection
|
|
|
|
= getMachOSection("__TEXT","__ustring", 0,
|
|
|
|
SectionKind::getMergeable2ByteCString());
|
|
|
|
FourByteConstantSection // .literal4
|
|
|
|
= getMachOSection("__TEXT", "__literal4", MCSectionMachO::S_4BYTE_LITERALS,
|
|
|
|
SectionKind::getMergeableConst4());
|
|
|
|
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;
|
|
|
|
if (TM.getRelocationModel() != Reloc::Static &&
|
|
|
|
TM.getTargetData()->getPointerSize() == 32)
|
|
|
|
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 |
|
|
|
|
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
|
|
|
|
SectionKind::getText());
|
|
|
|
ConstTextCoalSection
|
|
|
|
= getMachOSection("__TEXT", "__const_coal", MCSectionMachO::S_COALESCED,
|
|
|
|
SectionKind::getText());
|
|
|
|
ConstDataCoalSection
|
|
|
|
= getMachOSection("__DATA","__const_coal", MCSectionMachO::S_COALESCED,
|
|
|
|
SectionKind::getText());
|
|
|
|
ConstDataSection // .const_data
|
|
|
|
= getMachOSection("__DATA", "__const", 0,
|
|
|
|
SectionKind::getReadOnlyWithRel());
|
|
|
|
DataCoalSection
|
|
|
|
= getMachOSection("__DATA","__datacoal_nt", MCSectionMachO::S_COALESCED,
|
|
|
|
SectionKind::getDataRel());
|
|
|
|
DataCommonSection
|
|
|
|
= getMachOSection("__DATA","__common", MCSectionMachO::S_ZEROFILL,
|
|
|
|
SectionKind::getBSS());
|
|
|
|
DataBSSSection
|
|
|
|
= getMachOSection("__DATA","__bss", MCSectionMachO::S_ZEROFILL,
|
|
|
|
SectionKind::getBSS());
|
|
|
|
|
|
|
|
|
|
|
|
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());
|
|
|
|
StaticDtorSection
|
|
|
|
= getMachOSection("__TEXT", "__destructor", 0, SectionKind::getDataRel());
|
|
|
|
} else {
|
|
|
|
StaticCtorSection
|
|
|
|
= getMachOSection("__DATA", "__mod_init_func",
|
|
|
|
MCSectionMachO::S_MOD_INIT_FUNC_POINTERS,
|
|
|
|
SectionKind::getDataRel());
|
|
|
|
StaticDtorSection
|
|
|
|
= getMachOSection("__DATA", "__mod_term_func",
|
|
|
|
MCSectionMachO::S_MOD_TERM_FUNC_POINTERS,
|
|
|
|
SectionKind::getDataRel());
|
|
|
|
}
|
|
|
|
|
|
|
|
// Exception Handling.
|
2010-03-15 21:09:38 +00:00
|
|
|
LSDASection = getMachOSection("__TEXT", "__gcc_except_tab", 0,
|
|
|
|
SectionKind::getReadOnlyWithRel());
|
2010-02-15 22:37:53 +00:00
|
|
|
EHFrameSection =
|
|
|
|
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());
|
|
|
|
|
|
|
|
// Debug Information.
|
|
|
|
DwarfAbbrevSection =
|
|
|
|
getMachOSection("__DWARF", "__debug_abbrev", MCSectionMachO::S_ATTR_DEBUG,
|
|
|
|
SectionKind::getMetadata());
|
|
|
|
DwarfInfoSection =
|
|
|
|
getMachOSection("__DWARF", "__debug_info", MCSectionMachO::S_ATTR_DEBUG,
|
|
|
|
SectionKind::getMetadata());
|
|
|
|
DwarfLineSection =
|
|
|
|
getMachOSection("__DWARF", "__debug_line", MCSectionMachO::S_ATTR_DEBUG,
|
|
|
|
SectionKind::getMetadata());
|
|
|
|
DwarfFrameSection =
|
|
|
|
getMachOSection("__DWARF", "__debug_frame", MCSectionMachO::S_ATTR_DEBUG,
|
|
|
|
SectionKind::getMetadata());
|
|
|
|
DwarfPubNamesSection =
|
|
|
|
getMachOSection("__DWARF", "__debug_pubnames", MCSectionMachO::S_ATTR_DEBUG,
|
|
|
|
SectionKind::getMetadata());
|
|
|
|
DwarfPubTypesSection =
|
|
|
|
getMachOSection("__DWARF", "__debug_pubtypes", MCSectionMachO::S_ATTR_DEBUG,
|
|
|
|
SectionKind::getMetadata());
|
|
|
|
DwarfStrSection =
|
|
|
|
getMachOSection("__DWARF", "__debug_str", MCSectionMachO::S_ATTR_DEBUG,
|
|
|
|
SectionKind::getMetadata());
|
|
|
|
DwarfLocSection =
|
|
|
|
getMachOSection("__DWARF", "__debug_loc", MCSectionMachO::S_ATTR_DEBUG,
|
|
|
|
SectionKind::getMetadata());
|
|
|
|
DwarfARangesSection =
|
|
|
|
getMachOSection("__DWARF", "__debug_aranges", MCSectionMachO::S_ATTR_DEBUG,
|
|
|
|
SectionKind::getMetadata());
|
|
|
|
DwarfRangesSection =
|
|
|
|
getMachOSection("__DWARF", "__debug_ranges", MCSectionMachO::S_ATTR_DEBUG,
|
|
|
|
SectionKind::getMetadata());
|
|
|
|
DwarfMacroInfoSection =
|
|
|
|
getMachOSection("__DWARF", "__debug_macinfo", MCSectionMachO::S_ATTR_DEBUG,
|
|
|
|
SectionKind::getMetadata());
|
|
|
|
DwarfDebugInlineSection =
|
|
|
|
getMachOSection("__DWARF", "__debug_inlined", MCSectionMachO::S_ATTR_DEBUG,
|
|
|
|
SectionKind::getMetadata());
|
|
|
|
}
|
|
|
|
|
|
|
|
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, StubSize;
|
|
|
|
std::string ErrorCode =
|
|
|
|
MCSectionMachO::ParseSectionSpecifier(GV->getSection(), Segment, Section,
|
|
|
|
TAA, StubSize);
|
|
|
|
if (!ErrorCode.empty()) {
|
2010-04-07 22:58:41 +00:00
|
|
|
// If invalid, report the error with report_fatal_error.
|
|
|
|
report_fatal_error("Global variable '" + GV->getNameStr() +
|
2010-02-15 22:37:53 +00:00
|
|
|
"' 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) {
|
2010-04-07 22:58:41 +00:00
|
|
|
// If invalid, report the error with report_fatal_error.
|
|
|
|
report_fatal_error("Global variable '" + GV->getNameStr() +
|
2010-02-15 22:37:53 +00:00
|
|
|
"' 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()) {
|
|
|
|
if (Kind.isReadOnly())
|
|
|
|
return ConstTextCoalSection;
|
|
|
|
return DataCoalSection;
|
|
|
|
}
|
|
|
|
|
|
|
|
// FIXME: Alignment check should be handled by section classifier.
|
2010-03-07 04:28:09 +00:00
|
|
|
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;
|
2010-02-15 22:37:53 +00:00
|
|
|
|
|
|
|
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.
|
2010-03-15 20:37:38 +00:00
|
|
|
MCSymbol *Sym = Mang->getSymbol(GV);
|
|
|
|
if (Sym->getName()[0] == 'L' || Sym->getName()[0] == 'l')
|
2010-02-15 22:37:53 +00:00
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
const MCExpr *TargetLoweringObjectFileMachO::
|
2010-03-11 19:41:58 +00:00
|
|
|
getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
|
|
|
|
MachineModuleInfo *MMI, unsigned Encoding,
|
|
|
|
MCStreamer &Streamer) const {
|
2010-02-15 22:37:53 +00:00
|
|
|
// The mach-o version of this method defaults to returning a stub reference.
|
|
|
|
|
2010-02-21 20:28:15 +00:00
|
|
|
if (Encoding & DW_EH_PE_indirect) {
|
|
|
|
MachineModuleInfoMachO &MachOMMI =
|
|
|
|
MMI->getObjFileInfo<MachineModuleInfoMachO>();
|
|
|
|
|
2010-02-15 22:37:53 +00:00
|
|
|
SmallString<128> Name;
|
|
|
|
Mang->getNameWithPrefix(Name, GV, true);
|
|
|
|
Name += "$non_lazy_ptr";
|
2010-02-21 20:28:15 +00:00
|
|
|
|
|
|
|
// Add information about the stub reference to MachOMMI so that the stub
|
|
|
|
// gets emitted by the asmprinter.
|
2010-03-30 18:10:53 +00:00
|
|
|
MCSymbol *SSym = getContext().GetOrCreateSymbol(Name.str());
|
2010-03-15 20:37:38 +00:00
|
|
|
MachineModuleInfoImpl::StubValueTy &StubSym = MachOMMI.getGVStubEntry(SSym);
|
2010-03-10 22:34:10 +00:00
|
|
|
if (StubSym.getPointer() == 0) {
|
2010-03-15 20:37:38 +00:00
|
|
|
MCSymbol *Sym = Mang->getSymbol(GV);
|
|
|
|
StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage());
|
2010-02-21 20:28:15 +00:00
|
|
|
}
|
2010-02-15 22:37:53 +00:00
|
|
|
|
|
|
|
return TargetLoweringObjectFile::
|
2010-03-15 20:37:38 +00:00
|
|
|
getExprForDwarfReference(SSym, Mang, MMI,
|
2010-03-11 21:55:20 +00:00
|
|
|
Encoding & ~dwarf::DW_EH_PE_indirect, Streamer);
|
2010-02-15 22:37:53 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
return TargetLoweringObjectFile::
|
2010-03-11 19:41:58 +00:00
|
|
|
getExprForDwarfGlobalReference(GV, Mang, MMI, Encoding, Streamer);
|
2010-02-15 22:37:53 +00:00
|
|
|
}
|
|
|
|
|
2010-02-21 20:28:15 +00:00
|
|
|
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() const {
|
|
|
|
return DW_EH_PE_pcrel;
|
|
|
|
}
|
|
|
|
|
|
|
|
unsigned TargetLoweringObjectFileMachO::getTTypeEncoding() const {
|
2010-03-15 21:09:38 +00:00
|
|
|
return DW_EH_PE_indirect | DW_EH_PE_pcrel | DW_EH_PE_sdata4;
|
2010-02-21 20:28:15 +00:00
|
|
|
}
|
2010-02-15 22:37:53 +00:00
|
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// COFF
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
|
|
|
|
typedef StringMap<const MCSectionCOFF*> COFFUniqueMapTy;
|
|
|
|
|
|
|
|
TargetLoweringObjectFileCOFF::~TargetLoweringObjectFileCOFF() {
|
|
|
|
delete (COFFUniqueMapTy*)UniquingMap;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
const MCSection *TargetLoweringObjectFileCOFF::
|
|
|
|
getCOFFSection(StringRef Name, bool isDirective, SectionKind Kind) const {
|
|
|
|
// Create the map if it doesn't already exist.
|
|
|
|
if (UniquingMap == 0)
|
2010-04-08 20:30:37 +00:00
|
|
|
UniquingMap = new COFFUniqueMapTy();
|
2010-02-15 22:37:53 +00:00
|
|
|
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());
|
|
|
|
StaticCtorSection =
|
|
|
|
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 =
|
|
|
|
getCOFFSection("\t.section\t.debug_abbrev,\"dr\"",
|
|
|
|
true, SectionKind::getMetadata());
|
|
|
|
DwarfInfoSection =
|
|
|
|
getCOFFSection("\t.section\t.debug_info,\"dr\"",
|
|
|
|
true, SectionKind::getMetadata());
|
|
|
|
DwarfLineSection =
|
|
|
|
getCOFFSection("\t.section\t.debug_line,\"dr\"",
|
|
|
|
true, SectionKind::getMetadata());
|
|
|
|
DwarfFrameSection =
|
|
|
|
getCOFFSection("\t.section\t.debug_frame,\"dr\"",
|
|
|
|
true, SectionKind::getMetadata());
|
|
|
|
DwarfPubNamesSection =
|
|
|
|
getCOFFSection("\t.section\t.debug_pubnames,\"dr\"",
|
|
|
|
true, SectionKind::getMetadata());
|
|
|
|
DwarfPubTypesSection =
|
|
|
|
getCOFFSection("\t.section\t.debug_pubtypes,\"dr\"",
|
|
|
|
true, SectionKind::getMetadata());
|
|
|
|
DwarfStrSection =
|
|
|
|
getCOFFSection("\t.section\t.debug_str,\"dr\"",
|
|
|
|
true, SectionKind::getMetadata());
|
|
|
|
DwarfLocSection =
|
|
|
|
getCOFFSection("\t.section\t.debug_loc,\"dr\"",
|
|
|
|
true, SectionKind::getMetadata());
|
|
|
|
DwarfARangesSection =
|
|
|
|
getCOFFSection("\t.section\t.debug_aranges,\"dr\"",
|
|
|
|
true, SectionKind::getMetadata());
|
|
|
|
DwarfRangesSection =
|
|
|
|
getCOFFSection("\t.section\t.debug_ranges,\"dr\"",
|
|
|
|
true, SectionKind::getMetadata());
|
|
|
|
DwarfMacroInfoSection =
|
|
|
|
getCOFFSection("\t.section\t.debug_macinfo,\"dr\"",
|
|
|
|
true, SectionKind::getMetadata());
|
|
|
|
}
|
|
|
|
|
|
|
|
const MCSection *TargetLoweringObjectFileCOFF::
|
|
|
|
getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
|
|
|
|
Mangler *Mang, const TargetMachine &TM) const {
|
|
|
|
return getCOFFSection(GV->getSection(), false, Kind);
|
|
|
|
}
|
|
|
|
|
|
|
|
static const char *getCOFFSectionPrefixForUniqueGlobal(SectionKind Kind) {
|
|
|
|
if (Kind.isText())
|
|
|
|
return ".text$linkonce";
|
|
|
|
if (Kind.isWriteable())
|
|
|
|
return ".data$linkonce";
|
|
|
|
return ".rdata$linkonce";
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
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));
|
2010-03-15 20:37:38 +00:00
|
|
|
MCSymbol *Sym = Mang->getSymbol(GV);
|
|
|
|
Name.append(Sym->getName().begin(), Sym->getName().end());
|
2010-02-15 22:37:53 +00:00
|
|
|
return getCOFFSection(Name.str(), false, Kind);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (Kind.isText())
|
|
|
|
return getTextSection();
|
|
|
|
|
|
|
|
return getDataSection();
|
|
|
|
}
|
|
|
|
|