//===-- MObjectFileInfo.cpp - Object File Information ---------------------===// // // The LLVM Compiler Infrastructure // // This file is distributed under the University of Illinois Open Source // License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// #include "llvm/MC/MCObjectFileInfo.h" #include "llvm/ADT/StringExtras.h" #include "llvm/ADT/Triple.h" #include "llvm/MC/MCAsmInfo.h" #include "llvm/MC/MCContext.h" #include "llvm/MC/MCSection.h" #include "llvm/MC/MCSectionCOFF.h" #include "llvm/MC/MCSectionELF.h" #include "llvm/MC/MCSectionMachO.h" using namespace llvm; static bool useCompactUnwind(const Triple &T) { // Only on darwin. if (!T.isOSDarwin()) return false; // aarch64 always has it. if (T.getArch() == Triple::aarch64) return true; // Use it on newer version of OS X. if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6)) return true; // And the iOS simulator. if (T.isiOS() && (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)) return true; return false; } void MCObjectFileInfo::InitMachOMCObjectFileInfo(Triple T) { // MachO SupportsWeakOmittedEHFrame = false; if (T.isOSDarwin() && T.getArch() == Triple::aarch64) SupportsCompactUnwindWithoutEHFrame = true; PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; LSDAEncoding = FDECFIEncoding = dwarf::DW_EH_PE_pcrel; TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; // .comm doesn't support alignment before Leopard. if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5)) CommDirectiveSupportsAlignment = false; TextSection // .text = Ctx->getMachOSection("__TEXT", "__text", MachO::S_ATTR_PURE_INSTRUCTIONS, SectionKind::getText()); DataSection // .data = Ctx->getMachOSection("__DATA", "__data", 0, SectionKind::getDataRel()); // BSSSection might not be expected initialized on msvc. BSSSection = nullptr; TLSDataSection // .tdata = Ctx->getMachOSection("__DATA", "__thread_data", MachO::S_THREAD_LOCAL_REGULAR, SectionKind::getDataRel()); TLSBSSSection // .tbss = Ctx->getMachOSection("__DATA", "__thread_bss", MachO::S_THREAD_LOCAL_ZEROFILL, SectionKind::getThreadBSS()); // TODO: Verify datarel below. TLSTLVSection // .tlv = Ctx->getMachOSection("__DATA", "__thread_vars", MachO::S_THREAD_LOCAL_VARIABLES, SectionKind::getDataRel()); TLSThreadInitSection = Ctx->getMachOSection("__DATA", "__thread_init", MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS, SectionKind::getDataRel()); CStringSection // .cstring = Ctx->getMachOSection("__TEXT", "__cstring", MachO::S_CSTRING_LITERALS, SectionKind::getMergeable1ByteCString()); UStringSection = Ctx->getMachOSection("__TEXT","__ustring", 0, SectionKind::getMergeable2ByteCString()); FourByteConstantSection // .literal4 = Ctx->getMachOSection("__TEXT", "__literal4", MachO::S_4BYTE_LITERALS, SectionKind::getMergeableConst4()); EightByteConstantSection // .literal8 = Ctx->getMachOSection("__TEXT", "__literal8", MachO::S_8BYTE_LITERALS, SectionKind::getMergeableConst8()); SixteenByteConstantSection // .literal16 = Ctx->getMachOSection("__TEXT", "__literal16", MachO::S_16BYTE_LITERALS, SectionKind::getMergeableConst16()); ReadOnlySection // .const = Ctx->getMachOSection("__TEXT", "__const", 0, SectionKind::getReadOnly()); TextCoalSection = Ctx->getMachOSection("__TEXT", "__textcoal_nt", MachO::S_COALESCED | MachO::S_ATTR_PURE_INSTRUCTIONS, SectionKind::getText()); ConstTextCoalSection = Ctx->getMachOSection("__TEXT", "__const_coal", MachO::S_COALESCED, SectionKind::getReadOnly()); ConstDataSection // .const_data = Ctx->getMachOSection("__DATA", "__const", 0, SectionKind::getReadOnlyWithRel()); DataCoalSection = Ctx->getMachOSection("__DATA","__datacoal_nt", MachO::S_COALESCED, SectionKind::getDataRel()); DataCommonSection = Ctx->getMachOSection("__DATA","__common", MachO::S_ZEROFILL, SectionKind::getBSS()); DataBSSSection = Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL, SectionKind::getBSS()); LazySymbolPointerSection = Ctx->getMachOSection("__DATA", "__la_symbol_ptr", MachO::S_LAZY_SYMBOL_POINTERS, SectionKind::getMetadata()); NonLazySymbolPointerSection = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr", MachO::S_NON_LAZY_SYMBOL_POINTERS, SectionKind::getMetadata()); if (RelocM == Reloc::Static) { StaticCtorSection = Ctx->getMachOSection("__TEXT", "__constructor", 0, SectionKind::getDataRel()); StaticDtorSection = Ctx->getMachOSection("__TEXT", "__destructor", 0, SectionKind::getDataRel()); } else { StaticCtorSection = Ctx->getMachOSection("__DATA", "__mod_init_func", MachO::S_MOD_INIT_FUNC_POINTERS, SectionKind::getDataRel()); StaticDtorSection = Ctx->getMachOSection("__DATA", "__mod_term_func", MachO::S_MOD_TERM_FUNC_POINTERS, SectionKind::getDataRel()); } // Exception Handling. LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0, SectionKind::getReadOnlyWithRel()); COFFDebugSymbolsSection = nullptr; if (useCompactUnwind(T)) { CompactUnwindSection = Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG, SectionKind::getReadOnly()); if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86) CompactUnwindDwarfEHFrameOnly = 0x04000000; else if (T.getArch() == Triple::aarch64) CompactUnwindDwarfEHFrameOnly = 0x03000000; } // Debug Information. DwarfAccelNamesSection = Ctx->getMachOSection("__DWARF", "__apple_names", MachO::S_ATTR_DEBUG, SectionKind::getMetadata(), "names_begin"); DwarfAccelObjCSection = Ctx->getMachOSection("__DWARF", "__apple_objc", MachO::S_ATTR_DEBUG, SectionKind::getMetadata(), "objc_begin"); // 16 character section limit... DwarfAccelNamespaceSection = Ctx->getMachOSection("__DWARF", "__apple_namespac", MachO::S_ATTR_DEBUG, SectionKind::getMetadata(), "namespac_begin"); DwarfAccelTypesSection = Ctx->getMachOSection("__DWARF", "__apple_types", MachO::S_ATTR_DEBUG, SectionKind::getMetadata(), "types_begin"); DwarfAbbrevSection = Ctx->getMachOSection("__DWARF", "__debug_abbrev", MachO::S_ATTR_DEBUG, SectionKind::getMetadata(), "section_abbrev"); DwarfInfoSection = Ctx->getMachOSection("__DWARF", "__debug_info", MachO::S_ATTR_DEBUG, SectionKind::getMetadata(), "section_info"); DwarfLineSection = Ctx->getMachOSection("__DWARF", "__debug_line", MachO::S_ATTR_DEBUG, SectionKind::getMetadata(), "section_line"); DwarfFrameSection = Ctx->getMachOSection("__DWARF", "__debug_frame", MachO::S_ATTR_DEBUG, SectionKind::getMetadata()); DwarfPubNamesSection = Ctx->getMachOSection("__DWARF", "__debug_pubnames", MachO::S_ATTR_DEBUG, SectionKind::getMetadata()); DwarfPubTypesSection = Ctx->getMachOSection("__DWARF", "__debug_pubtypes", MachO::S_ATTR_DEBUG, SectionKind::getMetadata()); DwarfGnuPubNamesSection = Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn", MachO::S_ATTR_DEBUG, SectionKind::getMetadata()); DwarfGnuPubTypesSection = Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt", MachO::S_ATTR_DEBUG, SectionKind::getMetadata()); DwarfStrSection = Ctx->getMachOSection("__DWARF", "__debug_str", MachO::S_ATTR_DEBUG, SectionKind::getMetadata(), "info_string"); DwarfLocSection = Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG, SectionKind::getMetadata(), "section_debug_loc"); DwarfARangesSection = Ctx->getMachOSection("__DWARF", "__debug_aranges", MachO::S_ATTR_DEBUG, SectionKind::getMetadata()); DwarfRangesSection = Ctx->getMachOSection("__DWARF", "__debug_ranges", MachO::S_ATTR_DEBUG, SectionKind::getMetadata(), "debug_range"); DwarfDebugInlineSection = Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG, SectionKind::getMetadata()); StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps", 0, SectionKind::getMetadata()); TLSExtraDataSection = TLSTLVSection; } void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) { switch (T.getArch()) { case Triple::mips: case Triple::mipsel: FDECFIEncoding = dwarf::DW_EH_PE_sdata4; break; case Triple::mips64: case Triple::mips64el: FDECFIEncoding = dwarf::DW_EH_PE_sdata8; break; case Triple::x86_64: FDECFIEncoding = dwarf::DW_EH_PE_pcrel | ((CMModel == CodeModel::Large) ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); break; default: FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; break; } switch (T.getArch()) { case Triple::arm: case Triple::armeb: case Triple::thumb: case Triple::thumbeb: if (Ctx->getAsmInfo()->getExceptionHandlingType() == ExceptionHandling::ARM) break; // Fallthrough if not using EHABI case Triple::ppc: case Triple::x86: PersonalityEncoding = (RelocM == Reloc::PIC_) ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_absptr; LSDAEncoding = (RelocM == Reloc::PIC_) ? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_absptr; TTypeEncoding = (RelocM == Reloc::PIC_) ? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_absptr; break; case Triple::x86_64: if (RelocM == Reloc::PIC_) { PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium) ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8); LSDAEncoding = dwarf::DW_EH_PE_pcrel | (CMModel == CodeModel::Small ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8); TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | ((CMModel == CodeModel::Small || CMModel == CodeModel::Medium) ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8); } else { PersonalityEncoding = (CMModel == CodeModel::Small || CMModel == CodeModel::Medium) ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr; LSDAEncoding = (CMModel == CodeModel::Small) ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr; TTypeEncoding = (CMModel == CodeModel::Small) ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr; } break; case Triple::aarch64: case Triple::aarch64_be: // The small model guarantees static code/data size < 4GB, but not where it // will be in memory. Most of these could end up >2GB away so even a signed // pc-relative 32-bit address is insufficient, theoretically. if (RelocM == Reloc::PIC_) { PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8; LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8; TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8; } else { PersonalityEncoding = dwarf::DW_EH_PE_absptr; LSDAEncoding = dwarf::DW_EH_PE_absptr; TTypeEncoding = dwarf::DW_EH_PE_absptr; } break; case Triple::mips: case Triple::mipsel: case Triple::mips64: case Triple::mips64el: // MIPS uses indirect pointer to refer personality functions, so that the // eh_frame section can be read-only. DW.ref.personality will be generated // for relocation. PersonalityEncoding = dwarf::DW_EH_PE_indirect; break; case Triple::ppc64: case Triple::ppc64le: PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8; LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8; TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8; break; case Triple::sparc: if (RelocM == Reloc::PIC_) { LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; } else { LSDAEncoding = dwarf::DW_EH_PE_absptr; PersonalityEncoding = dwarf::DW_EH_PE_absptr; TTypeEncoding = dwarf::DW_EH_PE_absptr; } break; case Triple::sparcv9: LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; if (RelocM == Reloc::PIC_) { PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; } else { PersonalityEncoding = dwarf::DW_EH_PE_absptr; TTypeEncoding = dwarf::DW_EH_PE_absptr; } break; case Triple::systemz: // All currently-defined code models guarantee that 4-byte PC-relative // values will be in range. if (RelocM == Reloc::PIC_) { PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; } else { PersonalityEncoding = dwarf::DW_EH_PE_absptr; LSDAEncoding = dwarf::DW_EH_PE_absptr; TTypeEncoding = dwarf::DW_EH_PE_absptr; } break; default: break; } // Solaris requires different flags for .eh_frame to seemingly every other // platform. EHSectionType = ELF::SHT_PROGBITS; EHSectionFlags = ELF::SHF_ALLOC; if (T.isOSSolaris()) { if (T.getArch() == Triple::x86_64) EHSectionType = ELF::SHT_X86_64_UNWIND; else EHSectionFlags |= ELF::SHF_WRITE; } // ELF BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC); TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS, ELF::SHF_EXECINSTR | ELF::SHF_ALLOC); DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC); ReadOnlySection = Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); TLSDataSection = Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); TLSBSSSection = Ctx->getELFSection( ".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE); DataRelSection = Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS, ELF::SHF_ALLOC | ELF::SHF_WRITE); DataRelLocalSection = Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS, ELF::SHF_ALLOC | ELF::SHF_WRITE); DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS, ELF::SHF_ALLOC | ELF::SHF_WRITE); DataRelROLocalSection = Ctx->getELFSection( ".data.rel.ro.local", ELF::SHT_PROGBITS, ELF::SHF_ALLOC | ELF::SHF_WRITE); MergeableConst4Section = Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS, ELF::SHF_ALLOC | ELF::SHF_MERGE, 4, ""); MergeableConst8Section = Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS, ELF::SHF_ALLOC | ELF::SHF_MERGE, 8, ""); MergeableConst16Section = Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS, ELF::SHF_ALLOC | ELF::SHF_MERGE, 16, ""); StaticCtorSection = Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS, ELF::SHF_ALLOC | ELF::SHF_WRITE); StaticDtorSection = Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS, ELF::SHF_ALLOC | ELF::SHF_WRITE); // Exception Handling Sections. // FIXME: We're emitting LSDA info into a readonly section on ELF, even though // it contains relocatable pointers. In PIC mode, this is probably a big // runtime hit for C++ apps. Either the contents of the LSDA need to be // adjusted or this should be a data section. LSDASection = Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); COFFDebugSymbolsSection = nullptr; // Debug Info Sections. DwarfAbbrevSection = Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0, "section_abbrev"); DwarfInfoSection = Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0, "section_info"); DwarfLineSection = Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0); DwarfFrameSection = Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0); DwarfPubNamesSection = Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0); DwarfPubTypesSection = Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0); DwarfGnuPubNamesSection = Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0); DwarfGnuPubTypesSection = Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0); DwarfStrSection = Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS, ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, ""); DwarfLocSection = Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0); DwarfARangesSection = Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0); DwarfRangesSection = Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0, "debug_range"); // DWARF5 Experimental Debug Info // Accelerator Tables DwarfAccelNamesSection = Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0, "names_begin"); DwarfAccelObjCSection = Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0, "objc_begin"); DwarfAccelNamespaceSection = Ctx->getELFSection( ".apple_namespaces", ELF::SHT_PROGBITS, 0, "namespac_begin"); DwarfAccelTypesSection = Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0, "types_begin"); // Fission Sections DwarfInfoDWOSection = Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0); DwarfTypesDWOSection = Ctx->getELFSection(".debug_types.dwo", ELF::SHT_PROGBITS, 0); DwarfAbbrevDWOSection = Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0); DwarfStrDWOSection = Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS, ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, ""); DwarfLineDWOSection = Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0); DwarfLocDWOSection = Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0, "skel_loc"); DwarfStrOffDWOSection = Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0); DwarfAddrSection = Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0, "addr_sec"); StackMapSection = Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); } void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) { bool IsWoA = T.getArch() == Triple::arm || T.getArch() == Triple::thumb; CommDirectiveSupportsAlignment = true; // COFF BSSSection = Ctx->getCOFFSection( ".bss", COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, SectionKind::getBSS()); TextSection = Ctx->getCOFFSection( ".text", (IsWoA ? COFF::IMAGE_SCN_MEM_16BIT : (COFF::SectionCharacteristics)0) | COFF::IMAGE_SCN_CNT_CODE | COFF::IMAGE_SCN_MEM_EXECUTE | COFF::IMAGE_SCN_MEM_READ, SectionKind::getText()); DataSection = Ctx->getCOFFSection( ".data", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, SectionKind::getDataRel()); ReadOnlySection = Ctx->getCOFFSection( ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getReadOnly()); if (T.isKnownWindowsMSVCEnvironment() || T.isWindowsItaniumEnvironment()) { StaticCtorSection = Ctx->getCOFFSection(".CRT$XCU", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getReadOnly()); StaticDtorSection = Ctx->getCOFFSection(".CRT$XTX", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getReadOnly()); } else { StaticCtorSection = Ctx->getCOFFSection( ".ctors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, SectionKind::getDataRel()); StaticDtorSection = Ctx->getCOFFSection( ".dtors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, SectionKind::getDataRel()); } // FIXME: We're emitting LSDA info into a readonly section on COFF, even // though it contains relocatable pointers. In PIC mode, this is probably a // big runtime hit for C++ apps. Either the contents of the LSDA need to be // adjusted or this should be a data section. assert(T.isOSWindows() && "Windows is the only supported COFF target"); if (T.getArch() == Triple::x86_64) { // On Windows 64 with SEH, the LSDA is emitted into the .xdata section LSDASection = 0; } else { LSDASection = Ctx->getCOFFSection(".gcc_except_table", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getReadOnly()); } // Debug info. COFFDebugSymbolsSection = Ctx->getCOFFSection(".debug$S", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfAbbrevSection = Ctx->getCOFFSection( ".debug_abbrev", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata(), "section_abbrev"); DwarfInfoSection = Ctx->getCOFFSection( ".debug_info", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata(), "section_info"); DwarfLineSection = Ctx->getCOFFSection( ".debug_line", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata(), "section_line"); DwarfFrameSection = Ctx->getCOFFSection( ".debug_frame", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfPubNamesSection = Ctx->getCOFFSection( ".debug_pubnames", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfPubTypesSection = Ctx->getCOFFSection( ".debug_pubtypes", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfGnuPubNamesSection = Ctx->getCOFFSection( ".debug_gnu_pubnames", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfGnuPubTypesSection = Ctx->getCOFFSection( ".debug_gnu_pubtypes", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfStrSection = Ctx->getCOFFSection( ".debug_str", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata(), "info_string"); DwarfLocSection = Ctx->getCOFFSection( ".debug_loc", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata(), "section_debug_loc"); DwarfARangesSection = Ctx->getCOFFSection( ".debug_aranges", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfRangesSection = Ctx->getCOFFSection( ".debug_ranges", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata(), "debug_range"); DwarfInfoDWOSection = Ctx->getCOFFSection( ".debug_info.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata(), "section_info_dwo"); DwarfTypesDWOSection = Ctx->getCOFFSection( ".debug_types.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata(), "section_types_dwo"); DwarfAbbrevDWOSection = Ctx->getCOFFSection( ".debug_abbrev.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata(), "section_abbrev_dwo"); DwarfStrDWOSection = Ctx->getCOFFSection( ".debug_str.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata(), "skel_string"); DwarfLineDWOSection = Ctx->getCOFFSection( ".debug_line.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfLocDWOSection = Ctx->getCOFFSection( ".debug_loc.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata(), "skel_loc"); DwarfStrOffDWOSection = Ctx->getCOFFSection( ".debug_str_offsets.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfAddrSection = Ctx->getCOFFSection( ".debug_addr", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata(), "addr_sec"); DwarfAccelNamesSection = Ctx->getCOFFSection( ".apple_names", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata(), "names_begin"); DwarfAccelNamespaceSection = Ctx->getCOFFSection( ".apple_namespaces", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata(), "namespac_begin"); DwarfAccelTypesSection = Ctx->getCOFFSection( ".apple_types", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata(), "types_begin"); DwarfAccelObjCSection = Ctx->getCOFFSection( ".apple_objc", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata(), "objc_begin"); DrectveSection = Ctx->getCOFFSection( ".drectve", COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE, SectionKind::getMetadata()); PDataSection = Ctx->getCOFFSection( ".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getDataRel()); XDataSection = Ctx->getCOFFSection( ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getDataRel()); TLSDataSection = Ctx->getCOFFSection( ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, SectionKind::getDataRel()); } void MCObjectFileInfo::InitMCObjectFileInfo(StringRef T, Reloc::Model relocm, CodeModel::Model cm, MCContext &ctx) { RelocM = relocm; CMModel = cm; Ctx = &ctx; // Common. CommDirectiveSupportsAlignment = true; SupportsWeakOmittedEHFrame = true; SupportsCompactUnwindWithoutEHFrame = false; PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding = dwarf::DW_EH_PE_absptr; CompactUnwindDwarfEHFrameOnly = 0; EHFrameSection = nullptr; // Created on demand. CompactUnwindSection = nullptr; // Used only by selected targets. DwarfAccelNamesSection = nullptr; // Used only by selected targets. DwarfAccelObjCSection = nullptr; // Used only by selected targets. DwarfAccelNamespaceSection = nullptr; // Used only by selected targets. DwarfAccelTypesSection = nullptr; // Used only by selected targets. TT = Triple(T); Triple::ArchType Arch = TT.getArch(); // FIXME: Checking for Arch here to filter out bogus triples such as // cellspu-apple-darwin. Perhaps we should fix in Triple? if ((Arch == Triple::x86 || Arch == Triple::x86_64 || Arch == Triple::arm || Arch == Triple::thumb || Arch == Triple::aarch64 || Arch == Triple::ppc || Arch == Triple::ppc64 || Arch == Triple::UnknownArch) && (TT.isOSDarwin() || TT.isOSBinFormatMachO())) { Env = IsMachO; InitMachOMCObjectFileInfo(TT); } else if ((Arch == Triple::x86 || Arch == Triple::x86_64 || Arch == Triple::arm || Arch == Triple::thumb) && (TT.isOSWindows() && TT.getObjectFormat() == Triple::COFF)) { Env = IsCOFF; InitCOFFMCObjectFileInfo(TT); } else { Env = IsELF; InitELFMCObjectFileInfo(TT); } } const MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const { return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP, 0, utostr(Hash)); } void MCObjectFileInfo::InitEHFrameSection() { if (Env == IsMachO) EHFrameSection = Ctx->getMachOSection("__TEXT", "__eh_frame", MachO::S_COALESCED | MachO::S_ATTR_NO_TOC | MachO::S_ATTR_STRIP_STATIC_SYMS | MachO::S_ATTR_LIVE_SUPPORT, SectionKind::getReadOnly()); else if (Env == IsELF) EHFrameSection = Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags); else EHFrameSection = Ctx->getCOFFSection(".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, SectionKind::getDataRel()); }