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" 16d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/ADT/SmallString.h" 17d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/ADT/StringExtras.h" 18d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/ADT/Triple.h" 19d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/CodeGen/MachineModuleInfoImpls.h" 200b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/Constants.h" 210b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/DataLayout.h" 220b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/DerivedTypes.h" 230b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/Function.h" 240b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/GlobalVariable.h" 2536b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines#include "llvm/IR/Mangler.h" 260b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/Module.h" 27362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/MC/MCContext.h" 28362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/MC/MCExpr.h" 29eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattner#include "llvm/MC/MCSectionCOFF.h" 30d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/MC/MCSectionELF.h" 31d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/MC/MCSectionMachO.h" 3230deafc84adf88f643cdc39dc97a37537155347fRafael Espindola#include "llvm/MC/MCStreamer.h" 33362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/MC/MCSymbol.h" 34362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/Support/Dwarf.h" 35c85dca66e68c9fa6ffa8471c64113b12d8d94fb1Rafael Espindola#include "llvm/Support/ELF.h" 36362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/Support/ErrorHandling.h" 37362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov#include "llvm/Support/raw_ostream.h" 3836b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines#include "llvm/Target/TargetLowering.h" 39d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/Target/TargetMachine.h" 40362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikovusing namespace llvm; 41293d592bf9cff6c3679998dde32f3cfd3cd53bc4Anton Korobeynikovusing namespace dwarf; 42362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 43362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov//===----------------------------------------------------------------------===// 44362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov// ELF 45362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov//===----------------------------------------------------------------------===// 46362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 4736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen HinesMCSymbol *TargetLoweringObjectFileELF::getCFIPersonalitySymbol( 4836b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines const GlobalValue *GV, Mangler &Mang, const TargetMachine &TM, 4936b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines MachineModuleInfo *MMI) const { 5060246a96224c8b790177253bf25433b93b335d2bRafael Espindola unsigned Encoding = getPersonalityEncoding(); 51cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines if ((Encoding & 0x80) == dwarf::DW_EH_PE_indirect) 52fb66f477a1c1cdde2670163bd60e42139a5009d8Rafael Espindola return getContext().GetOrCreateSymbol(StringRef("DW.ref.") + 5336b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines TM.getSymbol(GV, Mang)->getName()); 54cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines if ((Encoding & 0x70) == dwarf::DW_EH_PE_absptr) 55cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines return TM.getSymbol(GV, Mang); 56cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines report_fatal_error("We do not support this DWARF encoding yet!"); 5730deafc84adf88f643cdc39dc97a37537155347fRafael Espindola} 5830deafc84adf88f643cdc39dc97a37537155347fRafael Espindola 5930deafc84adf88f643cdc39dc97a37537155347fRafael Espindolavoid TargetLoweringObjectFileELF::emitPersonalityValue(MCStreamer &Streamer, 6030deafc84adf88f643cdc39dc97a37537155347fRafael Espindola const TargetMachine &TM, 617afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola const MCSymbol *Sym) const { 62fb66f477a1c1cdde2670163bd60e42139a5009d8Rafael Espindola SmallString<64> NameData("DW.ref."); 63fb66f477a1c1cdde2670163bd60e42139a5009d8Rafael Espindola NameData += Sym->getName(); 64fb66f477a1c1cdde2670163bd60e42139a5009d8Rafael Espindola MCSymbol *Label = getContext().GetOrCreateSymbol(NameData); 65018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola Streamer.EmitSymbolAttribute(Label, MCSA_Hidden); 66018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola Streamer.EmitSymbolAttribute(Label, MCSA_Weak); 67fb66f477a1c1cdde2670163bd60e42139a5009d8Rafael Espindola StringRef Prefix = ".data."; 68fb66f477a1c1cdde2670163bd60e42139a5009d8Rafael Espindola NameData.insert(NameData.begin(), Prefix.begin(), Prefix.end()); 69018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola unsigned Flags = ELF::SHF_ALLOC | ELF::SHF_WRITE | ELF::SHF_GROUP; 70018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola const MCSection *Sec = getContext().getELFSection(NameData, 71018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola ELF::SHT_PROGBITS, 72018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola Flags, 73018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola SectionKind::getDataRel(), 74018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola 0, Label->getName()); 75426c2bf5cdd2173e4a33aea8cb92cf684a724f4bChandler Carruth unsigned Size = TM.getDataLayout()->getPointerSize(); 76018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola Streamer.SwitchSection(Sec); 77426c2bf5cdd2173e4a33aea8cb92cf684a724f4bChandler Carruth Streamer.EmitValueToAlignment(TM.getDataLayout()->getPointerABIAlignment()); 78018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola Streamer.EmitSymbolAttribute(Label, MCSA_ELF_TypeObject); 79ca5b752d1873707c5c7d846515998ccf5002edcaDavid Chisnall const MCExpr *E = MCConstantExpr::Create(Size, getContext()); 80018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola Streamer.EmitELFSize(Label, E); 81018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola Streamer.EmitLabel(Label); 82018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola 83018e38c6dd8794c6c58be518ddaae99033f6d080Rafael Espindola Streamer.EmitSymbolValue(Sym, Size); 8430deafc84adf88f643cdc39dc97a37537155347fRafael Espindola} 8530deafc84adf88f643cdc39dc97a37537155347fRafael Espindola 8636b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hinesconst MCExpr *TargetLoweringObjectFileELF::getTTypeGlobalReference( 8736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines const GlobalValue *GV, unsigned Encoding, Mangler &Mang, 8836b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines const TargetMachine &TM, MachineModuleInfo *MMI, 8936b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines MCStreamer &Streamer) const { 9025efd6d556718295a63d37f5294985746af354f6Anton Korobeynikov 9125efd6d556718295a63d37f5294985746af354f6Anton Korobeynikov if (Encoding & dwarf::DW_EH_PE_indirect) { 9225efd6d556718295a63d37f5294985746af354f6Anton Korobeynikov MachineModuleInfoELF &ELFMMI = MMI->getObjFileInfo<MachineModuleInfoELF>(); 9325efd6d556718295a63d37f5294985746af354f6Anton Korobeynikov 9436b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines MCSymbol *SSym = getSymbolWithGlobalValueBase(GV, ".DW.stub", Mang, TM); 9525efd6d556718295a63d37f5294985746af354f6Anton Korobeynikov 9625efd6d556718295a63d37f5294985746af354f6Anton Korobeynikov // Add information about the stub reference to ELFMMI so that the stub 9725efd6d556718295a63d37f5294985746af354f6Anton Korobeynikov // gets emitted by the asmprinter. 9825efd6d556718295a63d37f5294985746af354f6Anton Korobeynikov MachineModuleInfoImpl::StubValueTy &StubSym = ELFMMI.getGVStubEntry(SSym); 99dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines if (!StubSym.getPointer()) { 10036b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines MCSymbol *Sym = TM.getSymbol(GV, Mang); 10125efd6d556718295a63d37f5294985746af354f6Anton Korobeynikov StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage()); 10225efd6d556718295a63d37f5294985746af354f6Anton Korobeynikov } 10325efd6d556718295a63d37f5294985746af354f6Anton Korobeynikov 10425efd6d556718295a63d37f5294985746af354f6Anton Korobeynikov return TargetLoweringObjectFile:: 10525efd6d556718295a63d37f5294985746af354f6Anton Korobeynikov getTTypeReference(MCSymbolRefExpr::Create(SSym, getContext()), 10625efd6d556718295a63d37f5294985746af354f6Anton Korobeynikov Encoding & ~dwarf::DW_EH_PE_indirect, Streamer); 10725efd6d556718295a63d37f5294985746af354f6Anton Korobeynikov } 10825efd6d556718295a63d37f5294985746af354f6Anton Korobeynikov 10925efd6d556718295a63d37f5294985746af354f6Anton Korobeynikov return TargetLoweringObjectFile:: 11036b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines getTTypeGlobalReference(GV, Encoding, Mang, TM, MMI, Streamer); 11125efd6d556718295a63d37f5294985746af354f6Anton Korobeynikov} 11225efd6d556718295a63d37f5294985746af354f6Anton Korobeynikov 113362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikovstatic SectionKind 114362dd0bef5437f85586c046bc53287b6fbe9c099Anton KorobeynikovgetELFKindForNamedSection(StringRef Name, SectionKind K) { 115e6657980977ed63df8bbd2604c9fefe513ac4126Rafael Espindola // N.B.: The defaults used in here are no the same ones used in MC. 116e6657980977ed63df8bbd2604c9fefe513ac4126Rafael Espindola // We follow gcc, MC follows gas. For example, given ".section .eh_frame", 117e6657980977ed63df8bbd2604c9fefe513ac4126Rafael Espindola // both gas and MC will produce a section with no flags. Given 11896cb1128528a512f1ef9c28ae5e1b78a98dcc505Bill Wendling // section(".eh_frame") gcc will produce: 11996cb1128528a512f1ef9c28ae5e1b78a98dcc505Bill Wendling // 12096cb1128528a512f1ef9c28ae5e1b78a98dcc505Bill Wendling // .section .eh_frame,"a",@progbits 121362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Name.empty() || Name[0] != '.') return K; 122362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 123362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // Some lame default implementation based on some magic section names. 124362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Name == ".bss" || 125362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name.startswith(".bss.") || 126362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name.startswith(".gnu.linkonce.b.") || 127362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name.startswith(".llvm.linkonce.b.") || 128362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name == ".sbss" || 129362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name.startswith(".sbss.") || 130362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name.startswith(".gnu.linkonce.sb.") || 131362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name.startswith(".llvm.linkonce.sb.")) 132362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return SectionKind::getBSS(); 133362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 134362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Name == ".tdata" || 135362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name.startswith(".tdata.") || 136362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name.startswith(".gnu.linkonce.td.") || 137362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name.startswith(".llvm.linkonce.td.")) 138362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return SectionKind::getThreadData(); 139362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 140362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Name == ".tbss" || 141362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name.startswith(".tbss.") || 142362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name.startswith(".gnu.linkonce.tb.") || 143362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Name.startswith(".llvm.linkonce.tb.")) 144362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return SectionKind::getThreadBSS(); 145362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 146362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return K; 147362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 148362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 149362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 150362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikovstatic unsigned getELFSectionType(StringRef Name, SectionKind K) { 151362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 152362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Name == ".init_array") 153c85dca66e68c9fa6ffa8471c64113b12d8d94fb1Rafael Espindola return ELF::SHT_INIT_ARRAY; 154362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 155362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Name == ".fini_array") 156c85dca66e68c9fa6ffa8471c64113b12d8d94fb1Rafael Espindola return ELF::SHT_FINI_ARRAY; 157362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 158362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Name == ".preinit_array") 159c85dca66e68c9fa6ffa8471c64113b12d8d94fb1Rafael Espindola return ELF::SHT_PREINIT_ARRAY; 160362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 161362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (K.isBSS() || K.isThreadBSS()) 162c85dca66e68c9fa6ffa8471c64113b12d8d94fb1Rafael Espindola return ELF::SHT_NOBITS; 163362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 164c85dca66e68c9fa6ffa8471c64113b12d8d94fb1Rafael Espindola return ELF::SHT_PROGBITS; 165362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 166362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 167362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 168362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikovstatic unsigned 169362dd0bef5437f85586c046bc53287b6fbe9c099Anton KorobeynikovgetELFSectionFlags(SectionKind K) { 170362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov unsigned Flags = 0; 171362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 172362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (!K.isMetadata()) 1731c13026e8f94bd332c0979baa9c777da99d48736Rafael Espindola Flags |= ELF::SHF_ALLOC; 174362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 175362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (K.isText()) 1761c13026e8f94bd332c0979baa9c777da99d48736Rafael Espindola Flags |= ELF::SHF_EXECINSTR; 177362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 178d846e3fb5a36c625df1bea3d4ef4e337b7b6e917Rafael Espindola if (K.isWriteable()) 1791c13026e8f94bd332c0979baa9c777da99d48736Rafael Espindola Flags |= ELF::SHF_WRITE; 180362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 181362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (K.isThreadLocal()) 1821c13026e8f94bd332c0979baa9c777da99d48736Rafael Espindola Flags |= ELF::SHF_TLS; 183362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 184362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // K.isMergeableConst() is left out to honour PR4650 185362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (K.isMergeableCString() || K.isMergeableConst4() || 186362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov K.isMergeableConst8() || K.isMergeableConst16()) 1871c13026e8f94bd332c0979baa9c777da99d48736Rafael Espindola Flags |= ELF::SHF_MERGE; 188362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 189362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (K.isMergeableCString()) 1901c13026e8f94bd332c0979baa9c777da99d48736Rafael Espindola Flags |= ELF::SHF_STRINGS; 191362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 192362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return Flags; 193362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 194362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 195cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hinesstatic const Comdat *getELFComdat(const GlobalValue *GV) { 196cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines const Comdat *C = GV->getComdat(); 197cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines if (!C) 198cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines return nullptr; 199cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines 200cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines if (C->getSelectionKind() != Comdat::Any) 201cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines report_fatal_error("ELF COMDATs only support SelectionKind::Any, '" + 202cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines C->getName() + "' cannot be lowered."); 203cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines 204cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines return C; 205cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines} 206cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines 20736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hinesconst MCSection *TargetLoweringObjectFileELF::getExplicitSectionGlobal( 20836b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines const GlobalValue *GV, SectionKind Kind, Mangler &Mang, 20936b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines const TargetMachine &TM) const { 210362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov StringRef SectionName = GV->getSection(); 211362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 212362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // Infer section flags from the section name if we can. 213362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Kind = getELFKindForNamedSection(SectionName, Kind); 214362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 215cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines StringRef Group = ""; 216cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines unsigned Flags = getELFSectionFlags(Kind); 217cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines if (const Comdat *C = getELFComdat(GV)) { 218cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines Group = C->getName(); 219cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines Flags |= ELF::SHF_GROUP; 220cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines } 221287df1bc0309962770b6c176f2d143795dd3cc2fChris Lattner return getContext().getELFSection(SectionName, 222cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines getELFSectionType(SectionName, Kind), Flags, 223cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines Kind, /*EntrySize=*/0, Group); 224362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 225362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 22643ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner/// getSectionPrefixForGlobal - Return the section prefix name used by options 22743ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner/// FunctionsSections and DataSections. 228cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hinesstatic StringRef getSectionPrefixForGlobal(SectionKind Kind) { 22943ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner if (Kind.isText()) return ".text."; 23043ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner if (Kind.isReadOnly()) return ".rodata."; 2311d2d5a0227d6f1381f3ffa9c331045bdfa409ee8Anton Korobeynikov if (Kind.isBSS()) return ".bss."; 23243ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner 23343ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner if (Kind.isThreadData()) return ".tdata."; 23443ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner if (Kind.isThreadBSS()) return ".tbss."; 23543ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner 23643ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner if (Kind.isDataNoRel()) return ".data."; 23743ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner if (Kind.isDataRelLocal()) return ".data.rel.local."; 23843ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner if (Kind.isDataRel()) return ".data.rel."; 23943ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner if (Kind.isReadOnlyWithRelLocal()) return ".data.rel.ro.local."; 24043ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner 24143ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner assert(Kind.isReadOnlyWithRel() && "Unknown section kind"); 24243ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner return ".data.rel.ro."; 24343ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner} 24443ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner 245362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikovconst MCSection *TargetLoweringObjectFileELF:: 246362dd0bef5437f85586c046bc53287b6fbe9c099Anton KorobeynikovSelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind, 24736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines Mangler &Mang, const TargetMachine &TM) const { 24843ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner // If we have -ffunction-section or -fdata-section then we should emit the 24943ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner // global value to a uniqued section specifically for it. 25043ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner bool EmitUniquedSection; 25143ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner if (Kind.isText()) 25243ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner EmitUniquedSection = TM.getFunctionSections(); 253579d7a3dccaf3c2e91ee81c026c47a0850803820Michael J. Spencer else 25443ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner EmitUniquedSection = TM.getDataSections(); 255362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 256362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // If this global is linkonce/weak and the target handles this by emitting it 257362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // into a 'uniqued' section name, create and return the section now. 258cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines if ((GV->isWeakForLinker() || EmitUniquedSection || GV->hasComdat()) && 2591d2d5a0227d6f1381f3ffa9c331045bdfa409ee8Anton Korobeynikov !Kind.isCommon()) { 260cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines StringRef Prefix = getSectionPrefixForGlobal(Kind); 26143ac721e3b35341e7cf59d5982ad702ca8d27433Chris Lattner 262cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines SmallString<128> Name(Prefix); 26336b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines TM.getNameWithPrefix(Name, GV, Mang, true); 26436b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines 2655d618ef7f1ad005fc6912f3e9a08c044b082e47fRafael Espindola StringRef Group = ""; 2665d618ef7f1ad005fc6912f3e9a08c044b082e47fRafael Espindola unsigned Flags = getELFSectionFlags(Kind); 267cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines if (GV->isWeakForLinker() || GV->hasComdat()) { 268cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines if (const Comdat *C = getELFComdat(GV)) 269cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines Group = C->getName(); 270cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines else 271cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines Group = Name.substr(Prefix.size()); 2725d618ef7f1ad005fc6912f3e9a08c044b082e47fRafael Espindola Flags |= ELF::SHF_GROUP; 2735d618ef7f1ad005fc6912f3e9a08c044b082e47fRafael Espindola } 2745d618ef7f1ad005fc6912f3e9a08c044b082e47fRafael Espindola 275287df1bc0309962770b6c176f2d143795dd3cc2fChris Lattner return getContext().getELFSection(Name.str(), 276287df1bc0309962770b6c176f2d143795dd3cc2fChris Lattner getELFSectionType(Name.str(), Kind), 2775d618ef7f1ad005fc6912f3e9a08c044b082e47fRafael Espindola Flags, Kind, 0, Group); 278362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov } 279362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 280362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isText()) return TextSection; 281362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 282362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeable1ByteCString() || 283362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Kind.isMergeable2ByteCString() || 284362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov Kind.isMergeable4ByteCString()) { 285362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 286362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // We also need alignment here. 287362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // FIXME: this is getting the alignment of the character, not the 288362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // alignment of the global! 289362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov unsigned Align = 2903574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow TM.getDataLayout()->getPreferredAlignment(cast<GlobalVariable>(GV)); 291362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 292362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov const char *SizeSpec = ".rodata.str1."; 293362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeable2ByteCString()) 294362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov SizeSpec = ".rodata.str2."; 295362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov else if (Kind.isMergeable4ByteCString()) 296362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov SizeSpec = ".rodata.str4."; 297362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov else 298362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov assert(Kind.isMergeable1ByteCString() && "unknown string width"); 299362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 300362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 301362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov std::string Name = SizeSpec + utostr(Align); 302c85dca66e68c9fa6ffa8471c64113b12d8d94fb1Rafael Espindola return getContext().getELFSection(Name, ELF::SHT_PROGBITS, 3031c13026e8f94bd332c0979baa9c777da99d48736Rafael Espindola ELF::SHF_ALLOC | 3041c13026e8f94bd332c0979baa9c777da99d48736Rafael Espindola ELF::SHF_MERGE | 3051c13026e8f94bd332c0979baa9c777da99d48736Rafael Espindola ELF::SHF_STRINGS, 306287df1bc0309962770b6c176f2d143795dd3cc2fChris Lattner Kind); 307362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov } 308362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 309362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst()) { 310362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst4() && MergeableConst4Section) 311362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return MergeableConst4Section; 312362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst8() && MergeableConst8Section) 313362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return MergeableConst8Section; 314362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst16() && MergeableConst16Section) 315362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return MergeableConst16Section; 316362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return ReadOnlySection; // .const 317362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov } 318362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 319362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isReadOnly()) return ReadOnlySection; 320362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 321362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isThreadData()) return TLSDataSection; 322362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isThreadBSS()) return TLSBSSSection; 323362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 324362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // Note: we claim that common symbols are put in BSSSection, but they are 325362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // really emitted with the magic .comm directive, which creates a symbol table 326362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // entry but not a section. 327362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isBSS() || Kind.isCommon()) return BSSSection; 328362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 329362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isDataNoRel()) return DataSection; 330362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isDataRelLocal()) return DataRelLocalSection; 331362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isDataRel()) return DataRelSection; 332362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isReadOnlyWithRelLocal()) return DataRelROLocalSection; 333362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 334362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov assert(Kind.isReadOnlyWithRel() && "Unknown section kind"); 335362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return DataRelROSection; 336362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 337362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 338362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov/// getSectionForConstant - Given a mergeable constant with the 339362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov/// specified size and relocation information, return a section that it 340362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov/// should be placed in. 341362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikovconst MCSection *TargetLoweringObjectFileELF:: 342362dd0bef5437f85586c046bc53287b6fbe9c099Anton KorobeynikovgetSectionForConstant(SectionKind Kind) const { 343362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst4() && MergeableConst4Section) 344362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return MergeableConst4Section; 345362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst8() && MergeableConst8Section) 346362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return MergeableConst8Section; 347362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst16() && MergeableConst16Section) 348362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return MergeableConst16Section; 349362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isReadOnly()) 350362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return ReadOnlySection; 351362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 352362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isReadOnlyWithRelLocal()) return DataRelROLocalSection; 353362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov assert(Kind.isReadOnlyWithRel() && "Unknown section kind"); 354362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return DataRelROSection; 355362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 356362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 357dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hinesconst MCSection *TargetLoweringObjectFileELF::getStaticCtorSection( 358cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines unsigned Priority, const MCSymbol *KeySym) const { 3594a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov // The default scheme is .ctor / .dtor, so we have to invert the priority 3604a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov // numbering. 3614a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov if (Priority == 65535) 3624a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov return StaticCtorSection; 3634a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov 364d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola if (UseInitArray) { 365d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola std::string Name = std::string(".init_array.") + utostr(Priority); 366d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola return getContext().getELFSection(Name, ELF::SHT_INIT_ARRAY, 367d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola ELF::SHF_ALLOC | ELF::SHF_WRITE, 368d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola SectionKind::getDataRel()); 369d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola } else { 370d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola std::string Name = std::string(".ctors.") + utostr(65535 - Priority); 371d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola return getContext().getELFSection(Name, ELF::SHT_PROGBITS, 372d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola ELF::SHF_ALLOC |ELF::SHF_WRITE, 373d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola SectionKind::getDataRel()); 374d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola } 3754a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov} 3764a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov 377dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hinesconst MCSection *TargetLoweringObjectFileELF::getStaticDtorSection( 378cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines unsigned Priority, const MCSymbol *KeySym) const { 3794a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov // The default scheme is .ctor / .dtor, so we have to invert the priority 3804a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov // numbering. 3814a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov if (Priority == 65535) 3824a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov return StaticDtorSection; 3834a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov 384d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola if (UseInitArray) { 385d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola std::string Name = std::string(".fini_array.") + utostr(Priority); 386d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola return getContext().getELFSection(Name, ELF::SHT_FINI_ARRAY, 387d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola ELF::SHF_ALLOC | ELF::SHF_WRITE, 388d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola SectionKind::getDataRel()); 389d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola } else { 390d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola std::string Name = std::string(".dtors.") + utostr(65535 - Priority); 391d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola return getContext().getELFSection(Name, ELF::SHT_PROGBITS, 392d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola ELF::SHF_ALLOC |ELF::SHF_WRITE, 393d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola SectionKind::getDataRel()); 394d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola } 395d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola} 396d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola 397d6b43a317e71246380db55a50b799b062b53cdceRafael Espindolavoid 398d6b43a317e71246380db55a50b799b062b53cdceRafael EspindolaTargetLoweringObjectFileELF::InitializeELF(bool UseInitArray_) { 399d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola UseInitArray = UseInitArray_; 400d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola if (!UseInitArray) 401d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola return; 402d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola 403d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola StaticCtorSection = 404d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola getContext().getELFSection(".init_array", ELF::SHT_INIT_ARRAY, 405d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola ELF::SHF_WRITE | 406d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola ELF::SHF_ALLOC, 407d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola SectionKind::getDataRel()); 408d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola StaticDtorSection = 409d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola getContext().getELFSection(".fini_array", ELF::SHT_FINI_ARRAY, 410d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola ELF::SHF_WRITE | 411d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola ELF::SHF_ALLOC, 412d6b43a317e71246380db55a50b799b062b53cdceRafael Espindola SectionKind::getDataRel()); 4134a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov} 4144a99f59aef358fb93eac180e49f6dcef03822046Anton Korobeynikov 415362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov//===----------------------------------------------------------------------===// 416362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov// MachO 417362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov//===----------------------------------------------------------------------===// 418362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 41936b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines/// getDepLibFromLinkerOpt - Extract the dependent library name from a linker 42036b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines/// option string. Returns StringRef() if the option does not specify a library. 42136b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen HinesStringRef TargetLoweringObjectFileMachO:: 42236b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen HinesgetDepLibFromLinkerOpt(StringRef LinkerOption) const { 42336b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines const char *LibCmd = "-l"; 42436b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines if (LinkerOption.startswith(LibCmd)) 42536b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines return LinkerOption.substr(strlen(LibCmd)); 42636b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines return StringRef(); 42736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines} 42836b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines 4296d49b680be6e24b547e6910c2b64914913915084Daniel Dunbar/// emitModuleFlags - Perform code emission for module flags. 430b464d3ff72790260e8c2068afe856fd7299a6834Bill Wendlingvoid TargetLoweringObjectFileMachO:: 431057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill WendlingemitModuleFlags(MCStreamer &Streamer, 432057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill Wendling ArrayRef<Module::ModuleFlagEntry> ModuleFlags, 43336b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines Mangler &Mang, const TargetMachine &TM) const { 434b464d3ff72790260e8c2068afe856fd7299a6834Bill Wendling unsigned VersionVal = 0; 435adb082cd6ae2ec799838cd84d54a381bca175cd4Bill Wendling unsigned ImageInfoFlags = 0; 436dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines MDNode *LinkerOptions = nullptr; 437057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill Wendling StringRef SectionVal; 438b464d3ff72790260e8c2068afe856fd7299a6834Bill Wendling 439057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill Wendling for (ArrayRef<Module::ModuleFlagEntry>::iterator 440057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill Wendling i = ModuleFlags.begin(), e = ModuleFlags.end(); i != e; ++i) { 441057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill Wendling const Module::ModuleFlagEntry &MFE = *i; 442b464d3ff72790260e8c2068afe856fd7299a6834Bill Wendling 443b464d3ff72790260e8c2068afe856fd7299a6834Bill Wendling // Ignore flags with 'Require' behavior. 444057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill Wendling if (MFE.Behavior == Module::Require) 445b464d3ff72790260e8c2068afe856fd7299a6834Bill Wendling continue; 446b464d3ff72790260e8c2068afe856fd7299a6834Bill Wendling 447057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill Wendling StringRef Key = MFE.Key->getString(); 448057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill Wendling Value *Val = MFE.Val; 449b464d3ff72790260e8c2068afe856fd7299a6834Bill Wendling 4506d49b680be6e24b547e6910c2b64914913915084Daniel Dunbar if (Key == "Objective-C Image Info Version") { 451b464d3ff72790260e8c2068afe856fd7299a6834Bill Wendling VersionVal = cast<ConstantInt>(Val)->getZExtValue(); 4526d49b680be6e24b547e6910c2b64914913915084Daniel Dunbar } else if (Key == "Objective-C Garbage Collection" || 4536d49b680be6e24b547e6910c2b64914913915084Daniel Dunbar Key == "Objective-C GC Only" || 4546d49b680be6e24b547e6910c2b64914913915084Daniel Dunbar Key == "Objective-C Is Simulated") { 455adb082cd6ae2ec799838cd84d54a381bca175cd4Bill Wendling ImageInfoFlags |= cast<ConstantInt>(Val)->getZExtValue(); 4566d49b680be6e24b547e6910c2b64914913915084Daniel Dunbar } else if (Key == "Objective-C Image Info Section") { 457057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill Wendling SectionVal = cast<MDString>(Val)->getString(); 4586d49b680be6e24b547e6910c2b64914913915084Daniel Dunbar } else if (Key == "Linker Options") { 4596d49b680be6e24b547e6910c2b64914913915084Daniel Dunbar LinkerOptions = cast<MDNode>(Val); 4606d49b680be6e24b547e6910c2b64914913915084Daniel Dunbar } 4616d49b680be6e24b547e6910c2b64914913915084Daniel Dunbar } 4626d49b680be6e24b547e6910c2b64914913915084Daniel Dunbar 4636d49b680be6e24b547e6910c2b64914913915084Daniel Dunbar // Emit the linker options if present. 4646d49b680be6e24b547e6910c2b64914913915084Daniel Dunbar if (LinkerOptions) { 4656d49b680be6e24b547e6910c2b64914913915084Daniel Dunbar for (unsigned i = 0, e = LinkerOptions->getNumOperands(); i != e; ++i) { 4666d49b680be6e24b547e6910c2b64914913915084Daniel Dunbar MDNode *MDOptions = cast<MDNode>(LinkerOptions->getOperand(i)); 4676d49b680be6e24b547e6910c2b64914913915084Daniel Dunbar SmallVector<std::string, 4> StrOptions; 4686d49b680be6e24b547e6910c2b64914913915084Daniel Dunbar 4696d49b680be6e24b547e6910c2b64914913915084Daniel Dunbar // Convert to strings. 4706d49b680be6e24b547e6910c2b64914913915084Daniel Dunbar for (unsigned ii = 0, ie = MDOptions->getNumOperands(); ii != ie; ++ii) { 4716d49b680be6e24b547e6910c2b64914913915084Daniel Dunbar MDString *MDOption = cast<MDString>(MDOptions->getOperand(ii)); 4726d49b680be6e24b547e6910c2b64914913915084Daniel Dunbar StrOptions.push_back(MDOption->getString()); 4736d49b680be6e24b547e6910c2b64914913915084Daniel Dunbar } 4746d49b680be6e24b547e6910c2b64914913915084Daniel Dunbar 4756d49b680be6e24b547e6910c2b64914913915084Daniel Dunbar Streamer.EmitLinkerOptions(StrOptions); 4766d49b680be6e24b547e6910c2b64914913915084Daniel Dunbar } 477b464d3ff72790260e8c2068afe856fd7299a6834Bill Wendling } 478b464d3ff72790260e8c2068afe856fd7299a6834Bill Wendling 479057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill Wendling // The section is mandatory. If we don't have it, then we don't have GC info. 480057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill Wendling if (SectionVal.empty()) return; 481057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill Wendling 482057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill Wendling StringRef Segment, Section; 483057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill Wendling unsigned TAA = 0, StubSize = 0; 484057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill Wendling bool TAAParsed; 485057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill Wendling std::string ErrorCode = 486057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill Wendling MCSectionMachO::ParseSectionSpecifier(SectionVal, Segment, Section, 487057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill Wendling TAA, TAAParsed, StubSize); 4882de3ff50439918b5a822b3d06d4d7c5826e11e6cBill Wendling if (!ErrorCode.empty()) 489057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill Wendling // If invalid, report the error with report_fatal_error. 4902de3ff50439918b5a822b3d06d4d7c5826e11e6cBill Wendling report_fatal_error("Invalid section specifier '" + Section + "': " + 4912de3ff50439918b5a822b3d06d4d7c5826e11e6cBill Wendling ErrorCode + "."); 492b464d3ff72790260e8c2068afe856fd7299a6834Bill Wendling 493057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill Wendling // Get the section. 494057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill Wendling const MCSectionMachO *S = 495057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill Wendling getContext().getMachOSection(Segment, Section, TAA, StubSize, 4962de3ff50439918b5a822b3d06d4d7c5826e11e6cBill Wendling SectionKind::getDataNoRel()); 497057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill Wendling Streamer.SwitchSection(S); 498057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill Wendling Streamer.EmitLabel(getContext(). 499057d521e3d91a894f6c38fcbc21ee5950fbdf7b1Bill Wendling GetOrCreateSymbol(StringRef("L_OBJC_IMAGE_INFO"))); 500b464d3ff72790260e8c2068afe856fd7299a6834Bill Wendling Streamer.EmitIntValue(VersionVal, 4); 501adb082cd6ae2ec799838cd84d54a381bca175cd4Bill Wendling Streamer.EmitIntValue(ImageInfoFlags, 4); 502b464d3ff72790260e8c2068afe856fd7299a6834Bill Wendling Streamer.AddBlankLine(); 503b464d3ff72790260e8c2068afe856fd7299a6834Bill Wendling} 504b464d3ff72790260e8c2068afe856fd7299a6834Bill Wendling 505cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hinesstatic void checkMachOComdat(const GlobalValue *GV) { 506cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines const Comdat *C = GV->getComdat(); 507cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines if (!C) 508cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines return; 509cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines 510cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines report_fatal_error("MachO doesn't support COMDATs, '" + C->getName() + 511cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines "' cannot be lowered."); 512cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines} 513cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines 51436b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hinesconst MCSection *TargetLoweringObjectFileMachO::getExplicitSectionGlobal( 51536b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines const GlobalValue *GV, SectionKind Kind, Mangler &Mang, 51636b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines const TargetMachine &TM) const { 517362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // Parse the section specifier and create it if valid. 518362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov StringRef Segment, Section; 51965c8bca78854712ab2bf135c2008ed455ef0c9b7Stuart Hastings unsigned TAA = 0, StubSize = 0; 52065c8bca78854712ab2bf135c2008ed455ef0c9b7Stuart Hastings bool TAAParsed; 521cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines 522cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines checkMachOComdat(GV); 523cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines 524362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov std::string ErrorCode = 525362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov MCSectionMachO::ParseSectionSpecifier(GV->getSection(), Segment, Section, 52665c8bca78854712ab2bf135c2008ed455ef0c9b7Stuart Hastings TAA, TAAParsed, StubSize); 527362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (!ErrorCode.empty()) { 52875361b69f3f327842b9dad69fa7f28ae3b688412Chris Lattner // If invalid, report the error with report_fatal_error. 529a7b0cb759433c715065440ee2a963a04db7f2b0bBenjamin Kramer report_fatal_error("Global variable '" + GV->getName() + 530a7b0cb759433c715065440ee2a963a04db7f2b0bBenjamin Kramer "' has an invalid section specifier '" + 531a7b0cb759433c715065440ee2a963a04db7f2b0bBenjamin Kramer GV->getSection() + "': " + ErrorCode + "."); 532362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov } 533362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 534362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // Get the section. 535362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov const MCSectionMachO *S = 53622772214de79aa1c5ca38c4fb1da137d8fb30a05Chris Lattner getContext().getMachOSection(Segment, Section, TAA, StubSize, Kind); 537362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 5386ad82d81cc3061a000799ad8751f018c1301906bStuart Hastings // If TAA wasn't set by ParseSectionSpecifier() above, 5396ad82d81cc3061a000799ad8751f018c1301906bStuart Hastings // use the value returned by getMachOSection() as a default. 54065c8bca78854712ab2bf135c2008ed455ef0c9b7Stuart Hastings if (!TAAParsed) 5416ad82d81cc3061a000799ad8751f018c1301906bStuart Hastings TAA = S->getTypeAndAttributes(); 5426ad82d81cc3061a000799ad8751f018c1301906bStuart Hastings 543362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // Okay, now that we got the section, verify that the TAA & StubSize agree. 544362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // If the user declared multiple globals with different section flags, we need 545362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // to reject it here. 546362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (S->getTypeAndAttributes() != TAA || S->getStubSize() != StubSize) { 54775361b69f3f327842b9dad69fa7f28ae3b688412Chris Lattner // If invalid, report the error with report_fatal_error. 548a7b0cb759433c715065440ee2a963a04db7f2b0bBenjamin Kramer report_fatal_error("Global variable '" + GV->getName() + 549a7b0cb759433c715065440ee2a963a04db7f2b0bBenjamin Kramer "' section type or attributes does not match previous" 550a7b0cb759433c715065440ee2a963a04db7f2b0bBenjamin Kramer " section specifier"); 551362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov } 552362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 553362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return S; 554362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 555362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 55636b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hinesbool TargetLoweringObjectFileMachO::isSectionAtomizableBySymbols( 55736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines const MCSection &Section) const { 55836b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines const MCSectionMachO &SMO = static_cast<const MCSectionMachO&>(Section); 55936b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines 56036b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines // Sections holding 1 byte strings are atomized based on the data 56136b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines // they contain. 56236b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines // Sections holding 2 byte strings require symbols in order to be 56336b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines // atomized. 56436b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines // There is no dedicated section for 4 byte strings. 56536b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines if (SMO.getKind().isMergeable1ByteCString()) 56636b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines return false; 56736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines 56836b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines if (SMO.getSegmentName() == "__DATA" && 56936b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines SMO.getSectionName() == "__cfstring") 57036b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines return false; 57136b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines 57236b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines switch (SMO.getType()) { 57336b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines default: 57436b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines return true; 57536b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines 57636b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines // These sections are atomized at the element boundaries without using 57736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines // symbols. 57836b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines case MachO::S_4BYTE_LITERALS: 57936b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines case MachO::S_8BYTE_LITERALS: 58036b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines case MachO::S_16BYTE_LITERALS: 58136b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines case MachO::S_LITERAL_POINTERS: 58236b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines case MachO::S_NON_LAZY_SYMBOL_POINTERS: 58336b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines case MachO::S_LAZY_SYMBOL_POINTERS: 58436b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines case MachO::S_MOD_INIT_FUNC_POINTERS: 58536b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines case MachO::S_MOD_TERM_FUNC_POINTERS: 58636b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines case MachO::S_INTERPOSING: 58736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines return false; 58836b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines } 58936b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines} 59036b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines 591362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikovconst MCSection *TargetLoweringObjectFileMachO:: 592362dd0bef5437f85586c046bc53287b6fbe9c099Anton KorobeynikovSelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind, 59336b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines Mangler &Mang, const TargetMachine &TM) const { 594cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines checkMachOComdat(GV); 595fe128c6ac8a6ae6aa85f0168f99d9c28de010fd8Bill Wendling 596fe128c6ac8a6ae6aa85f0168f99d9c28de010fd8Bill Wendling // Handle thread local data. 597fe128c6ac8a6ae6aa85f0168f99d9c28de010fd8Bill Wendling if (Kind.isThreadBSS()) return TLSBSSSection; 598fe128c6ac8a6ae6aa85f0168f99d9c28de010fd8Bill Wendling if (Kind.isThreadData()) return TLSDataSection; 599fe128c6ac8a6ae6aa85f0168f99d9c28de010fd8Bill Wendling 600362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isText()) 6019b19dfc2e003e33892be2d80ad535d18f24c53d9Arnold Schwaighofer return GV->isWeakForLinker() ? TextCoalSection : TextSection; 6029b19dfc2e003e33892be2d80ad535d18f24c53d9Arnold Schwaighofer 6039b19dfc2e003e33892be2d80ad535d18f24c53d9Arnold Schwaighofer // If this is weak/linkonce, put this in a coalescable section, either in text 6049b19dfc2e003e33892be2d80ad535d18f24c53d9Arnold Schwaighofer // or data depending on if it is writable. 605362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (GV->isWeakForLinker()) { 606362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isReadOnly()) 6079b19dfc2e003e33892be2d80ad535d18f24c53d9Arnold Schwaighofer return ConstTextCoalSection; 6089b19dfc2e003e33892be2d80ad535d18f24c53d9Arnold Schwaighofer return DataCoalSection; 609362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov } 610362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 611362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // FIXME: Alignment check should be handled by section classifier. 61298f15d27cda62ca2f973da0244b6b5e15f18acb7Chris Lattner if (Kind.isMergeable1ByteCString() && 6133574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow TM.getDataLayout()->getPreferredAlignment(cast<GlobalVariable>(GV)) < 32) 61498f15d27cda62ca2f973da0244b6b5e15f18acb7Chris Lattner return CStringSection; 615579d7a3dccaf3c2e91ee81c026c47a0850803820Michael J. Spencer 61698f15d27cda62ca2f973da0244b6b5e15f18acb7Chris Lattner // Do not put 16-bit arrays in the UString section if they have an 61798f15d27cda62ca2f973da0244b6b5e15f18acb7Chris Lattner // externally visible label, this runs into issues with certain linker 61898f15d27cda62ca2f973da0244b6b5e15f18acb7Chris Lattner // versions. 61998f15d27cda62ca2f973da0244b6b5e15f18acb7Chris Lattner if (Kind.isMergeable2ByteCString() && !GV->hasExternalLinkage() && 6203574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow TM.getDataLayout()->getPreferredAlignment(cast<GlobalVariable>(GV)) < 32) 62198f15d27cda62ca2f973da0244b6b5e15f18acb7Chris Lattner return UStringSection; 622362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 623362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst()) { 624362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst4()) 625362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return FourByteConstantSection; 626362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst8()) 627362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return EightByteConstantSection; 62836b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines if (Kind.isMergeableConst16()) 629362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return SixteenByteConstantSection; 630362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov } 631362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 632362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // Otherwise, if it is readonly, but not something we can specially optimize, 633362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // just drop it in .const. 634362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isReadOnly()) 635362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return ReadOnlySection; 636362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 637362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // If this is marked const, put it into a const section. But if the dynamic 638362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // linker needs to write to it, put it in the data segment. 639362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isReadOnlyWithRel()) 640362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return ConstDataSection; 641362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 642362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // Put zero initialized globals with strong external linkage in the 643362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // DATA, __common section with the .zerofill directive. 644362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isBSSExtern()) 645362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return DataCommonSection; 646362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 647362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // Put zero initialized globals with local linkage in __DATA,__bss directive 648362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // with the .zerofill directive (aka .lcomm). 649362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isBSSLocal()) 650362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return DataBSSSection; 651579d7a3dccaf3c2e91ee81c026c47a0850803820Michael J. Spencer 652362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // Otherwise, just drop the variable in the normal data section. 653362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return DataSection; 654362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 655362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 656362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikovconst MCSection * 657362dd0bef5437f85586c046bc53287b6fbe9c099Anton KorobeynikovTargetLoweringObjectFileMachO::getSectionForConstant(SectionKind Kind) const { 658362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // If this constant requires a relocation, we have to put it in the data 659362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // segment, not in the text segment. 660362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isDataRel() || Kind.isReadOnlyWithRel()) 661362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return ConstDataSection; 662362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 663362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst4()) 664362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return FourByteConstantSection; 665362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isMergeableConst8()) 666362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return EightByteConstantSection; 66736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines if (Kind.isMergeableConst16()) 668362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return SixteenByteConstantSection; 669362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return ReadOnlySection; // .const 670362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 671362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 67236b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hinesconst MCExpr *TargetLoweringObjectFileMachO::getTTypeGlobalReference( 67336b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines const GlobalValue *GV, unsigned Encoding, Mangler &Mang, 67436b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines const TargetMachine &TM, MachineModuleInfo *MMI, 67536b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines MCStreamer &Streamer) const { 676362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // The mach-o version of this method defaults to returning a stub reference. 677362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 678293d592bf9cff6c3679998dde32f3cfd3cd53bc4Anton Korobeynikov if (Encoding & DW_EH_PE_indirect) { 679293d592bf9cff6c3679998dde32f3cfd3cd53bc4Anton Korobeynikov MachineModuleInfoMachO &MachOMMI = 680293d592bf9cff6c3679998dde32f3cfd3cd53bc4Anton Korobeynikov MMI->getObjFileInfo<MachineModuleInfoMachO>(); 681293d592bf9cff6c3679998dde32f3cfd3cd53bc4Anton Korobeynikov 68236b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines MCSymbol *SSym = 68336b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr", Mang, TM); 684293d592bf9cff6c3679998dde32f3cfd3cd53bc4Anton Korobeynikov 685293d592bf9cff6c3679998dde32f3cfd3cd53bc4Anton Korobeynikov // Add information about the stub reference to MachOMMI so that the stub 686293d592bf9cff6c3679998dde32f3cfd3cd53bc4Anton Korobeynikov // gets emitted by the asmprinter. 687671215464c8335e383fa2db90df2eab73ef83b10Bill Wendling MachineModuleInfoImpl::StubValueTy &StubSym = 688671215464c8335e383fa2db90df2eab73ef83b10Bill Wendling GV->hasHiddenVisibility() ? MachOMMI.getHiddenGVStubEntry(SSym) : 689671215464c8335e383fa2db90df2eab73ef83b10Bill Wendling MachOMMI.getGVStubEntry(SSym); 690dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines if (!StubSym.getPointer()) { 69136b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines MCSymbol *Sym = TM.getSymbol(GV, Mang); 6924c6741f7078f3a9f655e67bf56bd4d5d427fc6bcChris Lattner StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage()); 693293d592bf9cff6c3679998dde32f3cfd3cd53bc4Anton Korobeynikov } 694362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 695362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov return TargetLoweringObjectFile:: 69625efd6d556718295a63d37f5294985746af354f6Anton Korobeynikov getTTypeReference(MCSymbolRefExpr::Create(SSym, getContext()), 69725efd6d556718295a63d37f5294985746af354f6Anton Korobeynikov Encoding & ~dwarf::DW_EH_PE_indirect, Streamer); 698362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov } 699362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 70036b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines return TargetLoweringObjectFile::getTTypeGlobalReference(GV, Encoding, Mang, 70136b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines TM, MMI, Streamer); 702362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 703362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 70436b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen HinesMCSymbol *TargetLoweringObjectFileMachO::getCFIPersonalitySymbol( 70536b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines const GlobalValue *GV, Mangler &Mang, const TargetMachine &TM, 70636b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines MachineModuleInfo *MMI) const { 7077afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola // The mach-o version of this method defaults to returning a stub reference. 7087afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola MachineModuleInfoMachO &MachOMMI = 7097afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola MMI->getObjFileInfo<MachineModuleInfoMachO>(); 7107afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola 71136b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines MCSymbol *SSym = getSymbolWithGlobalValueBase(GV, "$non_lazy_ptr", Mang, TM); 7127afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola 7137afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola // Add information about the stub reference to MachOMMI so that the stub 7147afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola // gets emitted by the asmprinter. 715d7c2494b3cba8dce914a7d16cfca11ffcd223d4eBill Wendling MachineModuleInfoImpl::StubValueTy &StubSym = MachOMMI.getGVStubEntry(SSym); 716dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines if (!StubSym.getPointer()) { 71736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines MCSymbol *Sym = TM.getSymbol(GV, Mang); 7187afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage()); 7197afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola } 7207afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola 7217afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola return SSym; 7227afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola} 7237afec9cc0ff1654619d30b6f30e2a4d13369c8bfRafael Espindola 724362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov//===----------------------------------------------------------------------===// 725362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov// COFF 726362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov//===----------------------------------------------------------------------===// 727362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 728eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattnerstatic unsigned 729eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris LattnergetCOFFSectionFlags(SectionKind K) { 730eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattner unsigned Flags = 0; 731eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattner 73236335be3b95f856b7eb7e0766e01ba423315e1abAnton Korobeynikov if (K.isMetadata()) 7336e5ce287b0e53c264af0ba37169ad964e19b5bb7Chris Lattner Flags |= 73494610588af55ae7d16ba7d72d1e68324631ec249Daniel Dunbar COFF::IMAGE_SCN_MEM_DISCARDABLE; 735eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattner else if (K.isText()) 736eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattner Flags |= 73794610588af55ae7d16ba7d72d1e68324631ec249Daniel Dunbar COFF::IMAGE_SCN_MEM_EXECUTE | 7383931b54a5f274183f850b912e0003f9aa1600584Michael J. Spencer COFF::IMAGE_SCN_MEM_READ | 73994610588af55ae7d16ba7d72d1e68324631ec249Daniel Dunbar COFF::IMAGE_SCN_CNT_CODE; 7406e5ce287b0e53c264af0ba37169ad964e19b5bb7Chris Lattner else if (K.isBSS ()) 7416e5ce287b0e53c264af0ba37169ad964e19b5bb7Chris Lattner Flags |= 74294610588af55ae7d16ba7d72d1e68324631ec249Daniel Dunbar COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA | 74394610588af55ae7d16ba7d72d1e68324631ec249Daniel Dunbar COFF::IMAGE_SCN_MEM_READ | 74494610588af55ae7d16ba7d72d1e68324631ec249Daniel Dunbar COFF::IMAGE_SCN_MEM_WRITE; 745d4a19b6a72d19a6f90b676aac37118664b7b7a84Anton Korobeynikov else if (K.isThreadLocal()) 746d4a19b6a72d19a6f90b676aac37118664b7b7a84Anton Korobeynikov Flags |= 747d4a19b6a72d19a6f90b676aac37118664b7b7a84Anton Korobeynikov COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 748d4a19b6a72d19a6f90b676aac37118664b7b7a84Anton Korobeynikov COFF::IMAGE_SCN_MEM_READ | 749d4a19b6a72d19a6f90b676aac37118664b7b7a84Anton Korobeynikov COFF::IMAGE_SCN_MEM_WRITE; 750eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattner else if (K.isReadOnly()) 751eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattner Flags |= 75294610588af55ae7d16ba7d72d1e68324631ec249Daniel Dunbar COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 75394610588af55ae7d16ba7d72d1e68324631ec249Daniel Dunbar COFF::IMAGE_SCN_MEM_READ; 754eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattner else if (K.isWriteable()) 755eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattner Flags |= 75694610588af55ae7d16ba7d72d1e68324631ec249Daniel Dunbar COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | 75794610588af55ae7d16ba7d72d1e68324631ec249Daniel Dunbar COFF::IMAGE_SCN_MEM_READ | 75894610588af55ae7d16ba7d72d1e68324631ec249Daniel Dunbar COFF::IMAGE_SCN_MEM_WRITE; 759eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattner 760eb40a0fd98c44ecc6360e7fab33cf9e9911bed4fChris Lattner return Flags; 761362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 762362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 763cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hinesstatic const GlobalValue *getComdatGVForCOFF(const GlobalValue *GV) { 764cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines const Comdat *C = GV->getComdat(); 765cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines assert(C && "expected GV to have a Comdat!"); 766cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines 767cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines StringRef ComdatGVName = C->getName(); 768cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines const GlobalValue *ComdatGV = GV->getParent()->getNamedValue(ComdatGVName); 769cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines if (!ComdatGV) 770cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines report_fatal_error("Associative COMDAT symbol '" + ComdatGVName + 771cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines "' does not exist."); 772cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines 773cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines if (ComdatGV->getComdat() != C) 774cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines report_fatal_error("Associative COMDAT symbol '" + ComdatGVName + 775cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines "' is not a key for it's COMDAT."); 776cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines 777cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines return ComdatGV; 778cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines} 779cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines 780cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hinesstatic int getSelectionForCOFF(const GlobalValue *GV) { 781cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines if (const Comdat *C = GV->getComdat()) { 782cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines const GlobalValue *ComdatKey = getComdatGVForCOFF(GV); 783cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines if (const auto *GA = dyn_cast<GlobalAlias>(ComdatKey)) 784cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines ComdatKey = GA->getBaseObject(); 785cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines if (ComdatKey == GV) { 786cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines switch (C->getSelectionKind()) { 787cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines case Comdat::Any: 788cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines return COFF::IMAGE_COMDAT_SELECT_ANY; 789cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines case Comdat::ExactMatch: 790cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines return COFF::IMAGE_COMDAT_SELECT_EXACT_MATCH; 791cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines case Comdat::Largest: 792cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines return COFF::IMAGE_COMDAT_SELECT_LARGEST; 793cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines case Comdat::NoDuplicates: 794cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines return COFF::IMAGE_COMDAT_SELECT_NODUPLICATES; 795cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines case Comdat::SameSize: 796cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines return COFF::IMAGE_COMDAT_SELECT_SAME_SIZE; 797cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines } 798cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines } else { 799cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines return COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE; 800cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines } 801cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines } else if (GV->isWeakForLinker()) { 802cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines return COFF::IMAGE_COMDAT_SELECT_ANY; 803cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines } 804cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines return 0; 805cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines} 806cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines 80736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hinesconst MCSection *TargetLoweringObjectFileCOFF::getExplicitSectionGlobal( 80836b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines const GlobalValue *GV, SectionKind Kind, Mangler &Mang, 80936b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines const TargetMachine &TM) const { 8104de5872dede6e3dd80f7ab3df5df4fe0e33e3b2eMichael J. Spencer int Selection = 0; 8114de5872dede6e3dd80f7ab3df5df4fe0e33e3b2eMichael J. Spencer unsigned Characteristics = getCOFFSectionFlags(Kind); 81236b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines StringRef Name = GV->getSection(); 81336b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines StringRef COMDATSymName = ""; 814cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines if ((GV->isWeakForLinker() || GV->hasComdat()) && !Kind.isCommon()) { 815cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines Selection = getSelectionForCOFF(GV); 816cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines const GlobalValue *ComdatGV; 817cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines if (Selection == COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE) 818cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines ComdatGV = getComdatGVForCOFF(GV); 819cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines else 820cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines ComdatGV = GV; 821cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines 822cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines if (!ComdatGV->hasPrivateLinkage()) { 823cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines MCSymbol *Sym = TM.getSymbol(ComdatGV, Mang); 824cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines COMDATSymName = Sym->getName(); 825cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines Characteristics |= COFF::IMAGE_SCN_LNK_COMDAT; 826cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines } else { 827cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines Selection = 0; 828cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines } 8294de5872dede6e3dd80f7ab3df5df4fe0e33e3b2eMichael J. Spencer } 8304de5872dede6e3dd80f7ab3df5df4fe0e33e3b2eMichael J. Spencer return getContext().getCOFFSection(Name, 8314de5872dede6e3dd80f7ab3df5df4fe0e33e3b2eMichael J. Spencer Characteristics, 83280646283796b20c6a1b7d8eb69ce6f0478d54383Nico Rieck Kind, 83336b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines COMDATSymName, 83480646283796b20c6a1b7d8eb69ce6f0478d54383Nico Rieck Selection); 835362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 836362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 83736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hinesstatic const char *getCOFFSectionNameForUniqueGlobal(SectionKind Kind) { 838362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isText()) 83936b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines return ".text"; 840dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines if (Kind.isBSS()) 84136b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines return ".bss"; 84236b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines if (Kind.isThreadLocal()) 84336b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines return ".tls$"; 844362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isWriteable()) 84536b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines return ".data"; 84636b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines return ".rdata"; 847362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 848362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 849362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 850362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikovconst MCSection *TargetLoweringObjectFileCOFF:: 851362dd0bef5437f85586c046bc53287b6fbe9c099Anton KorobeynikovSelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind, 85236b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines Mangler &Mang, const TargetMachine &TM) const { 85336b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines // If we have -ffunction-sections then we should emit the global value to a 85436b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines // uniqued section specifically for it. 85536b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines bool EmitUniquedSection; 85636b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines if (Kind.isText()) 85736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines EmitUniquedSection = TM.getFunctionSections(); 85836b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines else 85936b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines EmitUniquedSection = TM.getDataSections(); 860362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 861362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // If this global is linkonce/weak and the target handles this by emitting it 862362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov // into a 'uniqued' section name, create and return the section now. 86336b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines // Section names depend on the name of the symbol which is not feasible if the 86436b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines // symbol has private linkage. 865cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines if ((GV->isWeakForLinker() || EmitUniquedSection || GV->hasComdat()) && 866cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines !Kind.isCommon()) { 86736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines const char *Name = getCOFFSectionNameForUniqueGlobal(Kind); 8686e5ce287b0e53c264af0ba37169ad964e19b5bb7Chris Lattner unsigned Characteristics = getCOFFSectionFlags(Kind); 8696e5ce287b0e53c264af0ba37169ad964e19b5bb7Chris Lattner 87094610588af55ae7d16ba7d72d1e68324631ec249Daniel Dunbar Characteristics |= COFF::IMAGE_SCN_LNK_COMDAT; 871cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines int Selection = getSelectionForCOFF(GV); 872cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines if (!Selection) 873cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines Selection = COFF::IMAGE_COMDAT_SELECT_NODUPLICATES; 874cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines const GlobalValue *ComdatGV; 875cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines if (GV->hasComdat()) 876cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines ComdatGV = getComdatGVForCOFF(GV); 877cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines else 878cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines ComdatGV = GV; 879cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines 880cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines if (!ComdatGV->hasPrivateLinkage()) { 881cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines MCSymbol *Sym = TM.getSymbol(ComdatGV, Mang); 882cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines StringRef COMDATSymName = Sym->getName(); 883cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines return getContext().getCOFFSection(Name, Characteristics, Kind, 884cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines COMDATSymName, Selection); 885cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines } 886362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov } 887362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 888362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov if (Kind.isText()) 8896aa9315353574c000c5f2aa0edd34067e94b8c79David Majnemer return TextSection; 890362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 891d4a19b6a72d19a6f90b676aac37118664b7b7a84Anton Korobeynikov if (Kind.isThreadLocal()) 8926aa9315353574c000c5f2aa0edd34067e94b8c79David Majnemer return TLSDataSection; 893d4a19b6a72d19a6f90b676aac37118664b7b7a84Anton Korobeynikov 8946aa9315353574c000c5f2aa0edd34067e94b8c79David Majnemer if (Kind.isReadOnly()) 8959706d43b56e16eb3029314e02c499305284e99f1David Majnemer return ReadOnlySection; 8969706d43b56e16eb3029314e02c499305284e99f1David Majnemer 897dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines // Note: we claim that common symbols are put in BSSSection, but they are 898dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines // really emitted with the magic .comm directive, which creates a symbol table 899dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines // entry but not a section. 900dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines if (Kind.isBSS() || Kind.isCommon()) 9016aa9315353574c000c5f2aa0edd34067e94b8c79David Majnemer return BSSSection; 9026aa9315353574c000c5f2aa0edd34067e94b8c79David Majnemer 9036aa9315353574c000c5f2aa0edd34067e94b8c79David Majnemer return DataSection; 904362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov} 905362dd0bef5437f85586c046bc53287b6fbe9c099Anton Korobeynikov 90636b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen HinesStringRef TargetLoweringObjectFileCOFF:: 90736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen HinesgetDepLibFromLinkerOpt(StringRef LinkerOption) const { 90836b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines const char *LibCmd = "/DEFAULTLIB:"; 90936b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines if (LinkerOption.startswith(LibCmd)) 91036b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines return LinkerOption.substr(strlen(LibCmd)); 91136b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines return StringRef(); 91236b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines} 91336b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines 9144b5581530393e647d559360f8c6f229c05aca94fReid Klecknervoid TargetLoweringObjectFileCOFF:: 9154b5581530393e647d559360f8c6f229c05aca94fReid KleckneremitModuleFlags(MCStreamer &Streamer, 9164b5581530393e647d559360f8c6f229c05aca94fReid Kleckner ArrayRef<Module::ModuleFlagEntry> ModuleFlags, 91736b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines Mangler &Mang, const TargetMachine &TM) const { 918dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines MDNode *LinkerOptions = nullptr; 9194b5581530393e647d559360f8c6f229c05aca94fReid Kleckner 9204b5581530393e647d559360f8c6f229c05aca94fReid Kleckner // Look for the "Linker Options" flag, since it's the only one we support. 9214b5581530393e647d559360f8c6f229c05aca94fReid Kleckner for (ArrayRef<Module::ModuleFlagEntry>::iterator 9224b5581530393e647d559360f8c6f229c05aca94fReid Kleckner i = ModuleFlags.begin(), e = ModuleFlags.end(); i != e; ++i) { 9234b5581530393e647d559360f8c6f229c05aca94fReid Kleckner const Module::ModuleFlagEntry &MFE = *i; 9244b5581530393e647d559360f8c6f229c05aca94fReid Kleckner StringRef Key = MFE.Key->getString(); 9254b5581530393e647d559360f8c6f229c05aca94fReid Kleckner Value *Val = MFE.Val; 9264b5581530393e647d559360f8c6f229c05aca94fReid Kleckner if (Key == "Linker Options") { 9274b5581530393e647d559360f8c6f229c05aca94fReid Kleckner LinkerOptions = cast<MDNode>(Val); 9284b5581530393e647d559360f8c6f229c05aca94fReid Kleckner break; 9294b5581530393e647d559360f8c6f229c05aca94fReid Kleckner } 9304b5581530393e647d559360f8c6f229c05aca94fReid Kleckner } 9314b5581530393e647d559360f8c6f229c05aca94fReid Kleckner if (!LinkerOptions) 9324b5581530393e647d559360f8c6f229c05aca94fReid Kleckner return; 9334b5581530393e647d559360f8c6f229c05aca94fReid Kleckner 9344b5581530393e647d559360f8c6f229c05aca94fReid Kleckner // Emit the linker options to the linker .drectve section. According to the 9354b5581530393e647d559360f8c6f229c05aca94fReid Kleckner // spec, this section is a space-separated string containing flags for linker. 9364b5581530393e647d559360f8c6f229c05aca94fReid Kleckner const MCSection *Sec = getDrectveSection(); 9374b5581530393e647d559360f8c6f229c05aca94fReid Kleckner Streamer.SwitchSection(Sec); 9384b5581530393e647d559360f8c6f229c05aca94fReid Kleckner for (unsigned i = 0, e = LinkerOptions->getNumOperands(); i != e; ++i) { 9394b5581530393e647d559360f8c6f229c05aca94fReid Kleckner MDNode *MDOptions = cast<MDNode>(LinkerOptions->getOperand(i)); 9404b5581530393e647d559360f8c6f229c05aca94fReid Kleckner for (unsigned ii = 0, ie = MDOptions->getNumOperands(); ii != ie; ++ii) { 9414b5581530393e647d559360f8c6f229c05aca94fReid Kleckner MDString *MDOption = cast<MDString>(MDOptions->getOperand(ii)); 9424b5581530393e647d559360f8c6f229c05aca94fReid Kleckner StringRef Op = MDOption->getString(); 9434b5581530393e647d559360f8c6f229c05aca94fReid Kleckner // Lead with a space for consistency with our dllexport implementation. 9444b5581530393e647d559360f8c6f229c05aca94fReid Kleckner std::string Escaped(" "); 9454b5581530393e647d559360f8c6f229c05aca94fReid Kleckner if (Op.find(" ") != StringRef::npos) { 9464b5581530393e647d559360f8c6f229c05aca94fReid Kleckner // The PE-COFF spec says args with spaces must be quoted. It doesn't say 9474b5581530393e647d559360f8c6f229c05aca94fReid Kleckner // how to escape quotes, but it probably uses this algorithm: 9484b5581530393e647d559360f8c6f229c05aca94fReid Kleckner // http://msdn.microsoft.com/en-us/library/17w5ykft(v=vs.85).aspx 9494b5581530393e647d559360f8c6f229c05aca94fReid Kleckner // FIXME: Reuse escaping code from Support/Windows/Program.inc 9504b5581530393e647d559360f8c6f229c05aca94fReid Kleckner Escaped.push_back('\"'); 9514b5581530393e647d559360f8c6f229c05aca94fReid Kleckner Escaped.append(Op); 9524b5581530393e647d559360f8c6f229c05aca94fReid Kleckner Escaped.push_back('\"'); 9534b5581530393e647d559360f8c6f229c05aca94fReid Kleckner } else { 9544b5581530393e647d559360f8c6f229c05aca94fReid Kleckner Escaped.append(Op); 9554b5581530393e647d559360f8c6f229c05aca94fReid Kleckner } 9564b5581530393e647d559360f8c6f229c05aca94fReid Kleckner Streamer.EmitBytes(Escaped); 9574b5581530393e647d559360f8c6f229c05aca94fReid Kleckner } 9584b5581530393e647d559360f8c6f229c05aca94fReid Kleckner } 9594b5581530393e647d559360f8c6f229c05aca94fReid Kleckner} 960dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines 961dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hinesstatic const MCSection *getAssociativeCOFFSection(MCContext &Ctx, 962dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines const MCSection *Sec, 963cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines const MCSymbol *KeySym) { 964dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines // Return the normal section if we don't have to be associative. 965dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines if (!KeySym) 966dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines return Sec; 967dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines 968dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines // Make an associative section with the same name and kind as the normal 969dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines // section. 970dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines const MCSectionCOFF *SecCOFF = cast<MCSectionCOFF>(Sec); 971dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines unsigned Characteristics = 972dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines SecCOFF->getCharacteristics() | COFF::IMAGE_SCN_LNK_COMDAT; 973dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines return Ctx.getCOFFSection(SecCOFF->getSectionName(), Characteristics, 974dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines SecCOFF->getKind(), KeySym->getName(), 975cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE); 976dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines} 977dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines 978dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hinesconst MCSection *TargetLoweringObjectFileCOFF::getStaticCtorSection( 979cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines unsigned Priority, const MCSymbol *KeySym) const { 980cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines return getAssociativeCOFFSection(getContext(), StaticCtorSection, KeySym); 981dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines} 982dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines 983dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hinesconst MCSection *TargetLoweringObjectFileCOFF::getStaticDtorSection( 984cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines unsigned Priority, const MCSymbol *KeySym) const { 985cd81d94322a39503e4a3e87b6ee03d4fcb3465fbStephen Hines return getAssociativeCOFFSection(getContext(), StaticDtorSection, KeySym); 986dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines} 987