TargetLoweringObjectFileImpl.cpp revision 4a99f59aef358fb93eac180e49f6dcef03822046
1362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov//===-- llvm/CodeGen/TargetLoweringObjectFileImpl.cpp - Object File Info --===// 2362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov// 3362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov// The LLVM Compiler Infrastructure 4362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov// 5362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov// This file is distributed under the University of Illinois Open Source 6362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov// License. See LICENSE.TXT for details. 7362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov// 8362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov//===----------------------------------------------------------------------===// 9362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov// 10362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov// This file implements classes used to handle lowerings specific to common 11362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov// object file formats. 12362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov// 13362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov//===----------------------------------------------------------------------===// 14362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 15362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h" 16362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/Constants.h" 17362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/DerivedTypes.h" 18362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/Function.h" 19362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/GlobalVariable.h" 20362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/CodeGen/MachineModuleInfoImpls.h" 21362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/MC/MCContext.h" 22362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/MC/MCExpr.h" 23362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/MC/MCSectionMachO.h" 24362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/MC/MCSectionELF.h" 25eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattner#include "llvm/MC/MCSectionCOFF.h" 2630deafc84adf88f643cdc39dc97a37537155347fRafael Espindola#include "llvm/MC/MCStreamer.h" 27362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/MC/MCSymbol.h" 28362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/Target/Mangler.h" 29362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/Target/TargetData.h" 30362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/Target/TargetMachine.h" 31362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/Target/TargetOptions.h" 32362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/Support/Dwarf.h" 33c85dca66e68c9fa6ffa8471c64113b12d8d94fb1Rafael Espindola#include "llvm/Support/ELF.h" 34362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/Support/ErrorHandling.h" 35362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/Support/raw_ostream.h" 36362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/ADT/SmallString.h" 37362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/ADT/StringExtras.h" 388048ebe91d76f5ee58f5c2c7535151d782af4b29Chris Lattner#include "llvm/ADT/Triple.h" 39362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikovusing namespace llvm; 40293d592bf9cff6c3679998dde32f3cfd3cd53bc4Anton Korobeynikovusing namespace dwarf; 41362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 42362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov//===----------------------------------------------------------------------===// 43362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov// ELF 44362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov//===----------------------------------------------------------------------===// 45362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 4630deafc84adf88f643cdc39dc97a37537155347fRafael EspindolaMCSymbol * 477afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael EspindolaTargetLoweringObjectFileELF::getCFIPersonalitySymbol(const GlobalValue *GV, 487afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola Mangler *Mang, 497afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola MachineModuleInfo *MMI) const { 5060246a96224c8b790177253bf25433b93b335d2bRafael Espindola unsigned Encoding = getPersonalityEncoding(); 517afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola switch (Encoding & 0x70) { 527afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola default: 537afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola report_fatal_error("We do not support this DWARF encoding yet!"); 547afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola case dwarf::DW_EH_PE_absptr: 557afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola return Mang->getSymbol(GV); 567afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola case dwarf::DW_EH_PE_pcrel: { 57fb66f477a1c1cdde2670163bd60e42139a5009d8Rafael Espindola return getContext().GetOrCreateSymbol(StringRef("DW.ref.") + 58fb66f477a1c1cdde2670163bd60e42139a5009d8Rafael Espindola Mang->getSymbol(GV)->getName()); 597afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola } 607afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola } 6130deafc84adf88f643cdc39dc97a37537155347fRafael Espindola} 6230deafc84adf88f643cdc39dc97a37537155347fRafael Espindola 6330deafc84adf88f643cdc39dc97a37537155347fRafael Espindolavoid TargetLoweringObjectFileELF::emitPersonalityValue(MCStreamer &Streamer, 6430deafc84adf88f643cdc39dc97a37537155347fRafael Espindola const TargetMachine &TM, 657afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola const MCSymbol *Sym) const { 66fb66f477a1c1cdde2670163bd60e42139a5009d8Rafael Espindola SmallString<64> NameData("DW.ref."); 67fb66f477a1c1cdde2670163bd60e42139a5009d8Rafael Espindola NameData += Sym->getName(); 68fb66f477a1c1cdde2670163bd60e42139a5009d8Rafael Espindola MCSymbol *Label = getContext().GetOrCreateSymbol(NameData); 69018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola Streamer.EmitSymbolAttribute(Label, MCSA_Hidden); 70018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola Streamer.EmitSymbolAttribute(Label, MCSA_Weak); 71fb66f477a1c1cdde2670163bd60e42139a5009d8Rafael Espindola StringRef Prefix = ".data."; 72fb66f477a1c1cdde2670163bd60e42139a5009d8Rafael Espindola NameData.insert(NameData.begin(), Prefix.begin(), Prefix.end()); 73018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola unsigned Flags = ELF::SHF_ALLOC | ELF::SHF_WRITE | ELF::SHF_GROUP; 74018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola const MCSection *Sec = getContext().getELFSection(NameData, 75018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola ELF::SHT_PROGBITS, 76018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola Flags, 77018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola SectionKind::getDataRel(), 78018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola 0, Label->getName()); 79018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola Streamer.SwitchSection(Sec); 80018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola Streamer.EmitValueToAlignment(8); 81018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola Streamer.EmitSymbolAttribute(Label, MCSA_ELF_TypeObject); 82018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola const MCExpr *E = MCConstantExpr::Create(8, getContext()); 83018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola Streamer.EmitELFSize(Label, E); 84018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola Streamer.EmitLabel(Label); 85018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola 86018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola unsigned Size = TM.getTargetData()->getPointerSize(); 87018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola Streamer.EmitSymbolValue(Sym, Size); 8830deafc84adf88f643cdc39dc97a37537155347fRafael Espindola} 8930deafc84adf88f643cdc39dc97a37537155347fRafael Espindola 90362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikovstatic SectionKind 91362dd0bef5437f85586c046bc53287b6fbe9c099Anton KorobeynikovgetELFKindForNamedSection(StringRef Name, SectionKind K) { 92e6657980977ed63df8bbd2604c9fefe513ac4126Rafael Espindola // N.B.: The defaults used in here are no the same ones used in MC. 93e6657980977ed63df8bbd2604c9fefe513ac4126Rafael Espindola // We follow gcc, MC follows gas. For example, given ".section .eh_frame", 94e6657980977ed63df8bbd2604c9fefe513ac4126Rafael Espindola // both gas and MC will produce a section with no flags. Given 95e6657980977ed63df8bbd2604c9fefe513ac4126Rafael Espindola // section(".eh_frame") gcc will produce 96e6657980977ed63df8bbd2604c9fefe513ac4126Rafael Espindola // .section .eh_frame,"a",@progbits 97362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Name.empty() || Name[0] != '.') return K; 98362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 99362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // Some lame default implementation based on some magic section names. 100362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Name == ".bss" || 101362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name.startswith(".bss.") || 102362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name.startswith(".gnu.linkonce.b.") || 103362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name.startswith(".llvm.linkonce.b.") || 104362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name == ".sbss" || 105362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name.startswith(".sbss.") || 106362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name.startswith(".gnu.linkonce.sb.") || 107362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name.startswith(".llvm.linkonce.sb.")) 108362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return SectionKind::getBSS(); 109362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 110362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Name == ".tdata" || 111362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name.startswith(".tdata.") || 112362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name.startswith(".gnu.linkonce.td.") || 113362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name.startswith(".llvm.linkonce.td.")) 114362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return SectionKind::getThreadData(); 115362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 116362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Name == ".tbss" || 117362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name.startswith(".tbss.") || 118362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name.startswith(".gnu.linkonce.tb.") || 119362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name.startswith(".llvm.linkonce.tb.")) 120362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return SectionKind::getThreadBSS(); 121362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 122362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return K; 123362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 124362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 125362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 126362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikovstatic unsigned getELFSectionType(StringRef Name, SectionKind K) { 127362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 128362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Name == ".init_array") 129c85dca66e68c9fa6ffa8471c64113b12d8d94fb1Rafael Espindola return ELF::SHT_INIT_ARRAY; 130362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 131362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Name == ".fini_array") 132c85dca66e68c9fa6ffa8471c64113b12d8d94fb1Rafael Espindola return ELF::SHT_FINI_ARRAY; 133362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 134362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Name == ".preinit_array") 135c85dca66e68c9fa6ffa8471c64113b12d8d94fb1Rafael Espindola return ELF::SHT_PREINIT_ARRAY; 136362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 137362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (K.isBSS() || K.isThreadBSS()) 138c85dca66e68c9fa6ffa8471c64113b12d8d94fb1Rafael Espindola return ELF::SHT_NOBITS; 139362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 140c85dca66e68c9fa6ffa8471c64113b12d8d94fb1Rafael Espindola return ELF::SHT_PROGBITS; 141362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 142362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 143362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 144362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikovstatic unsigned 145362dd0bef5437f85586c046bc53287b6fbe9c099Anton KorobeynikovgetELFSectionFlags(SectionKind K) { 146362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov unsigned Flags = 0; 147362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 148362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (!K.isMetadata()) 1491c13026e8f94bd332c0979baa9c777da99d48736Rafael Espindola Flags |= ELF::SHF_ALLOC; 150362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 151362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (K.isText()) 1521c13026e8f94bd332c0979baa9c777da99d48736Rafael Espindola Flags |= ELF::SHF_EXECINSTR; 153362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 154d846e3fb5a36c625df1bea3d4ef4e337b7b6e917Rafael Espindola if (K.isWriteable()) 1551c13026e8f94bd332c0979baa9c777da99d48736Rafael Espindola Flags |= ELF::SHF_WRITE; 156362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 157362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (K.isThreadLocal()) 1581c13026e8f94bd332c0979baa9c777da99d48736Rafael Espindola Flags |= ELF::SHF_TLS; 159362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 160362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // K.isMergeableConst() is left out to honour PR4650 161362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (K.isMergeableCString() || K.isMergeableConst4() || 162362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov K.isMergeableConst8() || K.isMergeableConst16()) 1631c13026e8f94bd332c0979baa9c777da99d48736Rafael Espindola Flags |= ELF::SHF_MERGE; 164362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 165362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (K.isMergeableCString()) 1661c13026e8f94bd332c0979baa9c777da99d48736Rafael Espindola Flags |= ELF::SHF_STRINGS; 167362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 168362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return Flags; 169362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 170362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 171362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 172362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikovconst MCSection *TargetLoweringObjectFileELF:: 173362dd0bef5437f85586c046bc53287b6fbe9c099Anton KorobeynikovgetExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind, 174362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Mangler *Mang, const TargetMachine &TM) const { 175362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov StringRef SectionName = GV->getSection(); 176362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 177362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // Infer section flags from the section name if we can. 178362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Kind = getELFKindForNamedSection(SectionName, Kind); 179362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 180287df1bc0309962770b6c176f2d143795dd3cc2fChris Lattner return getContext().getELFSection(SectionName, 181287df1bc0309962770b6c176f2d143795dd3cc2fChris Lattner getELFSectionType(SectionName, Kind), 18234be396a12b00a95a1353c356d64868798ea3098Rafael Espindola getELFSectionFlags(Kind), Kind); 183362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 184362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 18543ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner/// getSectionPrefixForGlobal - Return the section prefix name used by options 18643ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner/// FunctionsSections and DataSections. 18743ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattnerstatic const char *getSectionPrefixForGlobal(SectionKind Kind) { 18843ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner if (Kind.isText()) return ".text."; 18943ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner if (Kind.isReadOnly()) return ".rodata."; 19043ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner 19143ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner if (Kind.isThreadData()) return ".tdata."; 19243ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner if (Kind.isThreadBSS()) return ".tbss."; 19343ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner 19443ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner if (Kind.isDataNoRel()) return ".data."; 19543ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner if (Kind.isDataRelLocal()) return ".data.rel.local."; 19643ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner if (Kind.isDataRel()) return ".data.rel."; 19743ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner if (Kind.isReadOnlyWithRelLocal()) return ".data.rel.ro.local."; 19843ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner 19943ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner assert(Kind.isReadOnlyWithRel() && "Unknown section kind"); 20043ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner return ".data.rel.ro."; 20143ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner} 20243ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner 20343ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner 204362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikovconst MCSection *TargetLoweringObjectFileELF:: 205362dd0bef5437f85586c046bc53287b6fbe9c099Anton KorobeynikovSelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind, 206362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Mangler *Mang, const TargetMachine &TM) const { 20743ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner // If we have -ffunction-section or -fdata-section then we should emit the 20843ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner // global value to a uniqued section specifically for it. 20943ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner bool EmitUniquedSection; 21043ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner if (Kind.isText()) 21143ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner EmitUniquedSection = TM.getFunctionSections(); 212579d7a3dccaf3c2e91ee81c026c47a0850803820Michael J. Spencer else 21343ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner EmitUniquedSection = TM.getDataSections(); 214362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 215362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // If this global is linkonce/weak and the target handles this by emitting it 216362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // into a 'uniqued' section name, create and return the section now. 21743ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner if ((GV->isWeakForLinker() || EmitUniquedSection) && 21843ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner !Kind.isCommon() && !Kind.isBSS()) { 21943ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner const char *Prefix; 2205d618ef7f1ad005fc6912f3e9a08c044b082e47fRafael Espindola Prefix = getSectionPrefixForGlobal(Kind); 22143ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner 2224c6741f7078f3a9f655e67bf56bd4d5d427fc6bcChris Lattner SmallString<128> Name(Prefix, Prefix+strlen(Prefix)); 2234c6741f7078f3a9f655e67bf56bd4d5d427fc6bcChris Lattner MCSymbol *Sym = Mang->getSymbol(GV); 2244c6741f7078f3a9f655e67bf56bd4d5d427fc6bcChris Lattner Name.append(Sym->getName().begin(), Sym->getName().end()); 2255d618ef7f1ad005fc6912f3e9a08c044b082e47fRafael Espindola StringRef Group = ""; 2265d618ef7f1ad005fc6912f3e9a08c044b082e47fRafael Espindola unsigned Flags = getELFSectionFlags(Kind); 2275d618ef7f1ad005fc6912f3e9a08c044b082e47fRafael Espindola if (GV->isWeakForLinker()) { 2285d618ef7f1ad005fc6912f3e9a08c044b082e47fRafael Espindola Group = Sym->getName(); 2295d618ef7f1ad005fc6912f3e9a08c044b082e47fRafael Espindola Flags |= ELF::SHF_GROUP; 2305d618ef7f1ad005fc6912f3e9a08c044b082e47fRafael Espindola } 2315d618ef7f1ad005fc6912f3e9a08c044b082e47fRafael Espindola 232287df1bc0309962770b6c176f2d143795dd3cc2fChris Lattner return getContext().getELFSection(Name.str(), 233287df1bc0309962770b6c176f2d143795dd3cc2fChris Lattner getELFSectionType(Name.str(), Kind), 2345d618ef7f1ad005fc6912f3e9a08c044b082e47fRafael Espindola Flags, Kind, 0, Group); 235362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov } 236362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 237362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isText()) return TextSection; 238362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 239362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeable1ByteCString() || 240362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Kind.isMergeable2ByteCString() || 241362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Kind.isMergeable4ByteCString()) { 242362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 243362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // We also need alignment here. 244362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // FIXME: this is getting the alignment of the character, not the 245362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // alignment of the global! 246362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov unsigned Align = 247362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov TM.getTargetData()->getPreferredAlignment(cast<GlobalVariable>(GV)); 248362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 249362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov const char *SizeSpec = ".rodata.str1."; 250362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeable2ByteCString()) 251362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov SizeSpec = ".rodata.str2."; 252362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov else if (Kind.isMergeable4ByteCString()) 253362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov SizeSpec = ".rodata.str4."; 254362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov else 255362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov assert(Kind.isMergeable1ByteCString() && "unknown string width"); 256362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 257362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 258362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov std::string Name = SizeSpec + utostr(Align); 259c85dca66e68c9fa6ffa8471c64113b12d8d94fb1Rafael Espindola return getContext().getELFSection(Name, ELF::SHT_PROGBITS, 2601c13026e8f94bd332c0979baa9c777da99d48736Rafael Espindola ELF::SHF_ALLOC | 2611c13026e8f94bd332c0979baa9c777da99d48736Rafael Espindola ELF::SHF_MERGE | 2621c13026e8f94bd332c0979baa9c777da99d48736Rafael Espindola ELF::SHF_STRINGS, 263287df1bc0309962770b6c176f2d143795dd3cc2fChris Lattner Kind); 264362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov } 265362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 266362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst()) { 267362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst4() && MergeableConst4Section) 268362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return MergeableConst4Section; 269362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst8() && MergeableConst8Section) 270362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return MergeableConst8Section; 271362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst16() && MergeableConst16Section) 272362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return MergeableConst16Section; 273362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return ReadOnlySection; // .const 274362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov } 275362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 276362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isReadOnly()) return ReadOnlySection; 277362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 278362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isThreadData()) return TLSDataSection; 279362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isThreadBSS()) return TLSBSSSection; 280362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 281362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // Note: we claim that common symbols are put in BSSSection, but they are 282362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // really emitted with the magic .comm directive, which creates a symbol table 283362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // entry but not a section. 284362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isBSS() || Kind.isCommon()) return BSSSection; 285362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 286362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isDataNoRel()) return DataSection; 287362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isDataRelLocal()) return DataRelLocalSection; 288362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isDataRel()) return DataRelSection; 289362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isReadOnlyWithRelLocal()) return DataRelROLocalSection; 290362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 291362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov assert(Kind.isReadOnlyWithRel() && "Unknown section kind"); 292362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return DataRelROSection; 293362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 294362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 295362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov/// getSectionForConstant - Given a mergeable constant with the 296362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov/// specified size and relocation information, return a section that it 297362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov/// should be placed in. 298362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikovconst MCSection *TargetLoweringObjectFileELF:: 299362dd0bef5437f85586c046bc53287b6fbe9c099Anton KorobeynikovgetSectionForConstant(SectionKind Kind) const { 300362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst4() && MergeableConst4Section) 301362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return MergeableConst4Section; 302362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst8() && MergeableConst8Section) 303362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return MergeableConst8Section; 304362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst16() && MergeableConst16Section) 305362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return MergeableConst16Section; 306362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isReadOnly()) 307362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return ReadOnlySection; 308362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 309362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isReadOnlyWithRelLocal()) return DataRelROLocalSection; 310362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov assert(Kind.isReadOnlyWithRel() && "Unknown section kind"); 311362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return DataRelROSection; 312362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 313362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 314362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikovconst MCExpr *TargetLoweringObjectFileELF:: 3153192d14076dbe5724ce85b9d48644bb3c081f0e5Chris LattnergetExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang, 3163192d14076dbe5724ce85b9d48644bb3c081f0e5Chris Lattner MachineModuleInfo *MMI, 3173192d14076dbe5724ce85b9d48644bb3c081f0e5Chris Lattner unsigned Encoding, MCStreamer &Streamer) const { 318362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 319362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Encoding & dwarf::DW_EH_PE_indirect) { 320362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov MachineModuleInfoELF &ELFMMI = MMI->getObjFileInfo<MachineModuleInfoELF>(); 321362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 322362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov SmallString<128> Name; 323362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Mang->getNameWithPrefix(Name, GV, true); 324362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name += ".DW.stub"; 325362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 326362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // Add information about the stub reference to ELFMMI so that the stub 327362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // gets emitted by the asmprinter. 3289b97a73dedf736e14b04a3d1a153f10d25b2507bChris Lattner MCSymbol *SSym = getContext().GetOrCreateSymbol(Name.str()); 3294c6741f7078f3a9f655e67bf56bd4d5d427fc6bcChris Lattner MachineModuleInfoImpl::StubValueTy &StubSym = ELFMMI.getGVStubEntry(SSym); 330cebae36f57456fe6b0e13726acd1e0250654f02dBill Wendling if (StubSym.getPointer() == 0) { 3314c6741f7078f3a9f655e67bf56bd4d5d427fc6bcChris Lattner MCSymbol *Sym = Mang->getSymbol(GV); 3324c6741f7078f3a9f655e67bf56bd4d5d427fc6bcChris Lattner StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage()); 333362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov } 334362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 335362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return TargetLoweringObjectFile:: 3364788c3e839203dc75ba9fe2026f315095677715cRafael Espindola getExprForDwarfReference(SSym, Encoding & ~dwarf::DW_EH_PE_indirect, Streamer); 337362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov } 338362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 339362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return TargetLoweringObjectFile:: 3403192d14076dbe5724ce85b9d48644bb3c081f0e5Chris Lattner getExprForDwarfGlobalReference(GV, Mang, MMI, Encoding, Streamer); 341362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 342362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 3434a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikovconst MCSection * 3444a99f59aef358fb93eac180e49f6dcef03822046Anton KorobeynikovTargetLoweringObjectFileELF::getStaticCtorSection(unsigned Priority) const { 3454a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov // The default scheme is .ctor / .dtor, so we have to invert the priority 3464a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov // numbering. 3474a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov if (Priority == 65535) 3484a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov return StaticCtorSection; 3494a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov 3504a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov std::string Name = std::string(".ctors.") + utostr(65535 - Priority); 3514a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov return getContext().getELFSection(Name, ELF::SHT_PROGBITS, 3524a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov ELF::SHF_ALLOC |ELF::SHF_WRITE, 3534a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov SectionKind::getDataRel()); 3544a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov} 3554a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov 3564a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikovconst MCSection * 3574a99f59aef358fb93eac180e49f6dcef03822046Anton KorobeynikovTargetLoweringObjectFileELF::getStaticDtorSection(unsigned Priority) const { 3584a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov // The default scheme is .ctor / .dtor, so we have to invert the priority 3594a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov // numbering. 3604a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov if (Priority == 65535) 3614a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov return StaticDtorSection; 3624a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov 3634a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov std::string Name = std::string(".dtors.") + utostr(65535 - Priority); 3644a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov return getContext().getELFSection(Name, ELF::SHT_PROGBITS, 3654a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov ELF::SHF_ALLOC |ELF::SHF_WRITE, 3664a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov SectionKind::getDataRel()); 3674a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov} 3684a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov 369362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov//===----------------------------------------------------------------------===// 370362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov// MachO 371362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov//===----------------------------------------------------------------------===// 372362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 373362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikovconst MCSection *TargetLoweringObjectFileMachO:: 374362dd0bef5437f85586c046bc53287b6fbe9c099Anton KorobeynikovgetExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind, 375362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Mangler *Mang, const TargetMachine &TM) const { 376362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // Parse the section specifier and create it if valid. 377362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov StringRef Segment, Section; 37865c8bca78854712ab2bf135c2008ed455ef0c9b7Stuart Hastings unsigned TAA = 0, StubSize = 0; 37965c8bca78854712ab2bf135c2008ed455ef0c9b7Stuart Hastings bool TAAParsed; 380362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov std::string ErrorCode = 381362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov MCSectionMachO::ParseSectionSpecifier(GV->getSection(), Segment, Section, 38265c8bca78854712ab2bf135c2008ed455ef0c9b7Stuart Hastings TAA, TAAParsed, StubSize); 383362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (!ErrorCode.empty()) { 38475361b69f3f327842b9dad69fa7f28ae3b688412Chris Lattner // If invalid, report the error with report_fatal_error. 385a7b0cb759433c715065440ee2a963a04db7f2b0bBenjamin Kramer report_fatal_error("Global variable '" + GV->getName() + 386a7b0cb759433c715065440ee2a963a04db7f2b0bBenjamin Kramer "' has an invalid section specifier '" + 387a7b0cb759433c715065440ee2a963a04db7f2b0bBenjamin Kramer GV->getSection() + "': " + ErrorCode + "."); 388362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov } 389362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 390362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // Get the section. 391362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov const MCSectionMachO *S = 39222772214de79aa1c5ca38c4fb1da137d8fb30a05Chris Lattner getContext().getMachOSection(Segment, Section, TAA, StubSize, Kind); 393362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 3946ad82d81cc3061a000799ad8751f018c1301906bStuart Hastings // If TAA wasn't set by ParseSectionSpecifier() above, 3956ad82d81cc3061a000799ad8751f018c1301906bStuart Hastings // use the value returned by getMachOSection() as a default. 39665c8bca78854712ab2bf135c2008ed455ef0c9b7Stuart Hastings if (!TAAParsed) 3976ad82d81cc3061a000799ad8751f018c1301906bStuart Hastings TAA = S->getTypeAndAttributes(); 3986ad82d81cc3061a000799ad8751f018c1301906bStuart Hastings 399362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // Okay, now that we got the section, verify that the TAA & StubSize agree. 400362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // If the user declared multiple globals with different section flags, we need 401362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // to reject it here. 402362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (S->getTypeAndAttributes() != TAA || S->getStubSize() != StubSize) { 40375361b69f3f327842b9dad69fa7f28ae3b688412Chris Lattner // If invalid, report the error with report_fatal_error. 404a7b0cb759433c715065440ee2a963a04db7f2b0bBenjamin Kramer report_fatal_error("Global variable '" + GV->getName() + 405a7b0cb759433c715065440ee2a963a04db7f2b0bBenjamin Kramer "' section type or attributes does not match previous" 406a7b0cb759433c715065440ee2a963a04db7f2b0bBenjamin Kramer " section specifier"); 407362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov } 408362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 409362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return S; 410362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 411362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 412362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikovconst MCSection *TargetLoweringObjectFileMachO:: 413362dd0bef5437f85586c046bc53287b6fbe9c099Anton KorobeynikovSelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind, 4148116ca5134b355b897450f9a537c9c77e1f08723Eric Christopher Mangler *Mang, const TargetMachine &TM) const { 415579d7a3dccaf3c2e91ee81c026c47a0850803820Michael J. Spencer 41602b46bc9426925b90137d264216a54aa413335fdEric Christopher // Handle thread local data. 4178116ca5134b355b897450f9a537c9c77e1f08723Eric Christopher if (Kind.isThreadBSS()) return TLSBSSSection; 41802b46bc9426925b90137d264216a54aa413335fdEric Christopher if (Kind.isThreadData()) return TLSDataSection; 419362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 420362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isText()) 421362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return GV->isWeakForLinker() ? TextCoalSection : TextSection; 422362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 423362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // If this is weak/linkonce, put this in a coalescable section, either in text 424362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // or data depending on if it is writable. 425362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (GV->isWeakForLinker()) { 426362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isReadOnly()) 427362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return ConstTextCoalSection; 428362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return DataCoalSection; 429362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov } 430362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 431362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // FIXME: Alignment check should be handled by section classifier. 43298f15d27cda62ca2f973da0244b6b5e15f18acb7Chris Lattner if (Kind.isMergeable1ByteCString() && 43398f15d27cda62ca2f973da0244b6b5e15f18acb7Chris Lattner TM.getTargetData()->getPreferredAlignment(cast<GlobalVariable>(GV)) < 32) 43498f15d27cda62ca2f973da0244b6b5e15f18acb7Chris Lattner return CStringSection; 435579d7a3dccaf3c2e91ee81c026c47a0850803820Michael J. Spencer 43698f15d27cda62ca2f973da0244b6b5e15f18acb7Chris Lattner // Do not put 16-bit arrays in the UString section if they have an 43798f15d27cda62ca2f973da0244b6b5e15f18acb7Chris Lattner // externally visible label, this runs into issues with certain linker 43898f15d27cda62ca2f973da0244b6b5e15f18acb7Chris Lattner // versions. 43998f15d27cda62ca2f973da0244b6b5e15f18acb7Chris Lattner if (Kind.isMergeable2ByteCString() && !GV->hasExternalLinkage() && 44098f15d27cda62ca2f973da0244b6b5e15f18acb7Chris Lattner TM.getTargetData()->getPreferredAlignment(cast<GlobalVariable>(GV)) < 32) 44198f15d27cda62ca2f973da0244b6b5e15f18acb7Chris Lattner return UStringSection; 442362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 443362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst()) { 444362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst4()) 445362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return FourByteConstantSection; 446362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst8()) 447362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return EightByteConstantSection; 448362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst16() && SixteenByteConstantSection) 449362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return SixteenByteConstantSection; 450362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov } 451362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 452362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // Otherwise, if it is readonly, but not something we can specially optimize, 453362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // just drop it in .const. 454362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isReadOnly()) 455362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return ReadOnlySection; 456362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 457362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // If this is marked const, put it into a const section. But if the dynamic 458362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // linker needs to write to it, put it in the data segment. 459362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isReadOnlyWithRel()) 460362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return ConstDataSection; 461362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 462362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // Put zero initialized globals with strong external linkage in the 463362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // DATA, __common section with the .zerofill directive. 464362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isBSSExtern()) 465362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return DataCommonSection; 466362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 467362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // Put zero initialized globals with local linkage in __DATA,__bss directive 468362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // with the .zerofill directive (aka .lcomm). 469362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isBSSLocal()) 470362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return DataBSSSection; 471579d7a3dccaf3c2e91ee81c026c47a0850803820Michael J. Spencer 472362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // Otherwise, just drop the variable in the normal data section. 473362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return DataSection; 474362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 475362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 476362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikovconst MCSection * 477362dd0bef5437f85586c046bc53287b6fbe9c099Anton KorobeynikovTargetLoweringObjectFileMachO::getSectionForConstant(SectionKind Kind) const { 478362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // If this constant requires a relocation, we have to put it in the data 479362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // segment, not in the text segment. 480362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isDataRel() || Kind.isReadOnlyWithRel()) 481362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return ConstDataSection; 482362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 483362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst4()) 484362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return FourByteConstantSection; 485362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst8()) 486362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return EightByteConstantSection; 487362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst16() && SixteenByteConstantSection) 488362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return SixteenByteConstantSection; 489362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return ReadOnlySection; // .const 490362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 491362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 492362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov/// shouldEmitUsedDirectiveFor - This hook allows targets to selectively decide 493362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov/// not to emit the UsedDirective for some symbols in llvm.used. 494362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov// FIXME: REMOVE this (rdar://7071300) 495362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikovbool TargetLoweringObjectFileMachO:: 496362dd0bef5437f85586c046bc53287b6fbe9c099Anton KorobeynikovshouldEmitUsedDirectiveFor(const GlobalValue *GV, Mangler *Mang) const { 497362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov /// On Darwin, internally linked data beginning with "L" or "l" does not have 498362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov /// the directive emitted (this occurs in ObjC metadata). 499362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (!GV) return false; 500362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 50107d317711781d8c9268f7d6afcf1ba7eadf1d127Bill Wendling // Check whether the mangled name has the "Private" or "LinkerPrivate" prefix. 502362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (GV->hasLocalLinkage() && !isa<Function>(GV)) { 503362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // FIXME: ObjC metadata is currently emitted as internal symbols that have 50407d317711781d8c9268f7d6afcf1ba7eadf1d127Bill Wendling // \1L and \0l prefixes on them. Fix them to be Private/LinkerPrivate and 50507d317711781d8c9268f7d6afcf1ba7eadf1d127Bill Wendling // this horrible hack can go away. 5064c6741f7078f3a9f655e67bf56bd4d5d427fc6bcChris Lattner MCSymbol *Sym = Mang->getSymbol(GV); 5074c6741f7078f3a9f655e67bf56bd4d5d427fc6bcChris Lattner if (Sym->getName()[0] == 'L' || Sym->getName()[0] == 'l') 508362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return false; 509362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov } 510362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 511362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return true; 512362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 513362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 514362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikovconst MCExpr *TargetLoweringObjectFileMachO:: 5153192d14076dbe5724ce85b9d48644bb3c081f0e5Chris LattnergetExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang, 5163192d14076dbe5724ce85b9d48644bb3c081f0e5Chris Lattner MachineModuleInfo *MMI, unsigned Encoding, 5173192d14076dbe5724ce85b9d48644bb3c081f0e5Chris Lattner MCStreamer &Streamer) const { 518362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // The mach-o version of this method defaults to returning a stub reference. 519362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 520293d592bf9cff6c3679998dde32f3cfd3cd53bc4Anton Korobeynikov if (Encoding & DW_EH_PE_indirect) { 521293d592bf9cff6c3679998dde32f3cfd3cd53bc4Anton Korobeynikov MachineModuleInfoMachO &MachOMMI = 522293d592bf9cff6c3679998dde32f3cfd3cd53bc4Anton Korobeynikov MMI->getObjFileInfo<MachineModuleInfoMachO>(); 523293d592bf9cff6c3679998dde32f3cfd3cd53bc4Anton Korobeynikov 524362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov SmallString<128> Name; 525362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Mang->getNameWithPrefix(Name, GV, true); 526362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name += "$non_lazy_ptr"; 527293d592bf9cff6c3679998dde32f3cfd3cd53bc4Anton Korobeynikov 528293d592bf9cff6c3679998dde32f3cfd3cd53bc4Anton Korobeynikov // Add information about the stub reference to MachOMMI so that the stub 529293d592bf9cff6c3679998dde32f3cfd3cd53bc4Anton Korobeynikov // gets emitted by the asmprinter. 5309b97a73dedf736e14b04a3d1a153f10d25b2507bChris Lattner MCSymbol *SSym = getContext().GetOrCreateSymbol(Name.str()); 531671215464c8335e383fa2db90df2eab73ef83b10Bill Wendling MachineModuleInfoImpl::StubValueTy &StubSym = 532671215464c8335e383fa2db90df2eab73ef83b10Bill Wendling GV->hasHiddenVisibility() ? MachOMMI.getHiddenGVStubEntry(SSym) : 533671215464c8335e383fa2db90df2eab73ef83b10Bill Wendling MachOMMI.getGVStubEntry(SSym); 534cebae36f57456fe6b0e13726acd1e0250654f02dBill Wendling if (StubSym.getPointer() == 0) { 5354c6741f7078f3a9f655e67bf56bd4d5d427fc6bcChris Lattner MCSymbol *Sym = Mang->getSymbol(GV); 5364c6741f7078f3a9f655e67bf56bd4d5d427fc6bcChris Lattner StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage()); 537293d592bf9cff6c3679998dde32f3cfd3cd53bc4Anton Korobeynikov } 538362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 539362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return TargetLoweringObjectFile:: 5404788c3e839203dc75ba9fe2026f315095677715cRafael Espindola getExprForDwarfReference(SSym, Encoding & ~dwarf::DW_EH_PE_indirect, Streamer); 541362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov } 542362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 543362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return TargetLoweringObjectFile:: 5443192d14076dbe5724ce85b9d48644bb3c081f0e5Chris Lattner getExprForDwarfGlobalReference(GV, Mang, MMI, Encoding, Streamer); 545362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 546362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 5477afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael EspindolaMCSymbol *TargetLoweringObjectFileMachO:: 54860246a96224c8b790177253bf25433b93b335d2bRafael EspindolagetCFIPersonalitySymbol(const GlobalValue *GV, Mangler *Mang, 5497afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola MachineModuleInfo *MMI) const { 5507afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola // The mach-o version of this method defaults to returning a stub reference. 5517afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola MachineModuleInfoMachO &MachOMMI = 5527afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola MMI->getObjFileInfo<MachineModuleInfoMachO>(); 5537afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola 5547afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola SmallString<128> Name; 5557afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola Mang->getNameWithPrefix(Name, GV, true); 5567afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola Name += "$non_lazy_ptr"; 5577afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola 5587afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola // Add information about the stub reference to MachOMMI so that the stub 5597afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola // gets emitted by the asmprinter. 5607afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola MCSymbol *SSym = getContext().GetOrCreateSymbol(Name.str()); 561d7c2494b3cba8dce914a7d16cfca11ffcd223d4eBill Wendling MachineModuleInfoImpl::StubValueTy &StubSym = MachOMMI.getGVStubEntry(SSym); 5627afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola if (StubSym.getPointer() == 0) { 5637afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola MCSymbol *Sym = Mang->getSymbol(GV); 5647afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage()); 5657afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola } 5667afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola 5677afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola return SSym; 5687afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola} 5697afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola 570362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov//===----------------------------------------------------------------------===// 571362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov// COFF 572362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov//===----------------------------------------------------------------------===// 573362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 574eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattnerstatic unsigned 575eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris LattnergetCOFFSectionFlags(SectionKind K) { 576eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattner unsigned Flags = 0; 577eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattner 57836335be3b95f856b7eb7e0766e01ba423315e1abAnton Korobeynikov if (K.isMetadata()) 5796e5ce287b0e53c264af0ba37169ad964e19b5bb7Chris Lattner Flags |= 58094610588af55ae7d16ba7d72d1e68324631ec249Daniel Dunbar COFF::IMAGE_SCN_MEM_DISCARDABLE; 581eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattner else if (K.isText()) 582eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattner Flags |= 58394610588af55ae7d16ba7d72d1e68324631ec249Daniel Dunbar COFF::IMAGE_SCN_MEM_EXECUTE | 5843931b54a5f274183f850b912e0003f9aa1600584Michael J. Spencer COFF::IMAGE_SCN_MEM_READ | 58594610588af55ae7d16ba7d72d1e68324631ec249Daniel Dunbar COFF::IMAGE_SCN_CNT_CODE; 5866e5ce287b0e53c264af0ba37169ad964e19b5bb7Chris Lattner else if (K.isBSS ()) 5876e5ce287b0e53c264af0ba37169ad964e19b5bb7Chris Lattner Flags |= 58894610588af55ae7d16ba7d72d1e68324631ec249Daniel Dunbar COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA | 58994610588af55ae7d16ba7d72d1e68324631ec249Daniel Dunbar COFF::IMAGE_SCN_MEM_READ | 59094610588af55ae7d16ba7d72d1e68324631ec249Daniel Dunbar COFF::IMAGE_SCN_MEM_WRITE; 591eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattner else if (K.isReadOnly()) 592eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattner Flags |= 59394610588af55ae7d16ba7d72d1e68324631ec249Daniel Dunbar COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 59494610588af55ae7d16ba7d72d1e68324631ec249Daniel Dunbar COFF::IMAGE_SCN_MEM_READ; 595eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattner else if (K.isWriteable()) 596eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattner Flags |= 59794610588af55ae7d16ba7d72d1e68324631ec249Daniel Dunbar COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 59894610588af55ae7d16ba7d72d1e68324631ec249Daniel Dunbar COFF::IMAGE_SCN_MEM_READ | 59994610588af55ae7d16ba7d72d1e68324631ec249Daniel Dunbar COFF::IMAGE_SCN_MEM_WRITE; 600eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattner 601eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattner return Flags; 602362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 603362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 604362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikovconst MCSection *TargetLoweringObjectFileCOFF:: 605362dd0bef5437f85586c046bc53287b6fbe9c099Anton KorobeynikovgetExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind, 606362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Mangler *Mang, const TargetMachine &TM) const { 607eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattner return getContext().getCOFFSection(GV->getSection(), 608eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattner getCOFFSectionFlags(Kind), 609eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattner Kind); 610362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 611362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 612362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikovstatic const char *getCOFFSectionPrefixForUniqueGlobal(SectionKind Kind) { 613362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isText()) 6143b3b0ebd2ec9cd1de709007f31f40790c9243511NAKAMURA Takumi return ".text$"; 6156e5ce287b0e53c264af0ba37169ad964e19b5bb7Chris Lattner if (Kind.isBSS ()) 6163b3b0ebd2ec9cd1de709007f31f40790c9243511NAKAMURA Takumi return ".bss$"; 617362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isWriteable()) 6183b3b0ebd2ec9cd1de709007f31f40790c9243511NAKAMURA Takumi return ".data$"; 6193b3b0ebd2ec9cd1de709007f31f40790c9243511NAKAMURA Takumi return ".rdata$"; 620362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 621362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 622362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 623362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikovconst MCSection *TargetLoweringObjectFileCOFF:: 624362dd0bef5437f85586c046bc53287b6fbe9c099Anton KorobeynikovSelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind, 625362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Mangler *Mang, const TargetMachine &TM) const { 626362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov assert(!Kind.isThreadLocal() && "Doesn't support TLS"); 627362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 628362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // If this global is linkonce/weak and the target handles this by emitting it 629362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // into a 'uniqued' section name, create and return the section now. 630362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (GV->isWeakForLinker()) { 631362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov const char *Prefix = getCOFFSectionPrefixForUniqueGlobal(Kind); 632362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov SmallString<128> Name(Prefix, Prefix+strlen(Prefix)); 6334c6741f7078f3a9f655e67bf56bd4d5d427fc6bcChris Lattner MCSymbol *Sym = Mang->getSymbol(GV); 6343b3b0ebd2ec9cd1de709007f31f40790c9243511NAKAMURA Takumi Name.append(Sym->getName().begin() + 1, Sym->getName().end()); 6356e5ce287b0e53c264af0ba37169ad964e19b5bb7Chris Lattner 6366e5ce287b0e53c264af0ba37169ad964e19b5bb7Chris Lattner unsigned Characteristics = getCOFFSectionFlags(Kind); 6376e5ce287b0e53c264af0ba37169ad964e19b5bb7Chris Lattner 63894610588af55ae7d16ba7d72d1e68324631ec249Daniel Dunbar Characteristics |= COFF::IMAGE_SCN_LNK_COMDAT; 6396e5ce287b0e53c264af0ba37169ad964e19b5bb7Chris Lattner 6406e5ce287b0e53c264af0ba37169ad964e19b5bb7Chris Lattner return getContext().getCOFFSection(Name.str(), Characteristics, 641657985eb8b8cbbde2391befafccfafbddf04242aAnton Korobeynikov COFF::IMAGE_COMDAT_SELECT_ANY, Kind); 642362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov } 643362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 644362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isText()) 645362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return getTextSection(); 646362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 647362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return getDataSection(); 648362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 649362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 650