//===-- MCObjectFileInfo.cpp - Object File Information --------------------===// // // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. // See https://llvm.org/LICENSE.txt for license information. // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // //===----------------------------------------------------------------------===// #include "llvm/MC/MCObjectFileInfo.h" #include "llvm/ADT/StringExtras.h" #include "llvm/ADT/Triple.h" #include "llvm/BinaryFormat/COFF.h" #include "llvm/BinaryFormat/ELF.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" #include "llvm/MC/MCSectionWasm.h" #include "llvm/MC/MCSectionXCOFF.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 || T.getArch() == Triple::aarch64_32) return true; // armv7k always has it. if (T.isWatchABI()) 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.isX86()) return true; return false; } void MCObjectFileInfo::initMachOMCObjectFileInfo(const Triple &T) { // MachO SupportsWeakOmittedEHFrame = false; 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()); if (T.isOSDarwin() && (T.getArch() == Triple::aarch64 || T.getArch() == Triple::aarch64_32)) SupportsCompactUnwindWithoutEHFrame = true; if (T.isWatchABI()) OmitDwarfIfHaveCompactUnwind = true; FDECFIEncoding = dwarf::DW_EH_PE_pcrel; // .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::getData()); // BSSSection might not be expected initialized on msvc. BSSSection = nullptr; TLSDataSection // .tdata = Ctx->getMachOSection("__DATA", "__thread_data", MachO::S_THREAD_LOCAL_REGULAR, SectionKind::getData()); 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::getData()); TLSThreadInitSection = Ctx->getMachOSection( "__DATA", "__thread_init", MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS, SectionKind::getData()); 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()); // If the target is not powerpc, map the coal sections to the non-coal // sections. // // "__TEXT/__textcoal_nt" => section "__TEXT/__text" // "__TEXT/__const_coal" => section "__TEXT/__const" // "__DATA/__datacoal_nt" => section "__DATA/__data" Triple::ArchType ArchTy = T.getArch(); ConstDataSection // .const_data = Ctx->getMachOSection("__DATA", "__const", 0, SectionKind::getReadOnlyWithRel()); if (ArchTy == Triple::ppc || ArchTy == Triple::ppc64) { 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()); DataCoalSection = Ctx->getMachOSection( "__DATA", "__datacoal_nt", MachO::S_COALESCED, SectionKind::getData()); ConstDataCoalSection = DataCoalSection; } else { TextCoalSection = TextSection; ConstTextCoalSection = ReadOnlySection; DataCoalSection = DataSection; ConstDataCoalSection = ConstDataSection; } 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()); ThreadLocalPointerSection = Ctx->getMachOSection("__DATA", "__thread_ptr", MachO::S_THREAD_LOCAL_VARIABLE_POINTERS, SectionKind::getMetadata()); // Exception Handling. LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0, SectionKind::getReadOnlyWithRel()); COFFDebugSymbolsSection = nullptr; COFFDebugTypesSection = nullptr; COFFGlobalTypeHashesSection = nullptr; if (useCompactUnwind(T)) { CompactUnwindSection = Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG, SectionKind::getReadOnly()); if (T.isX86()) CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_X86_64_MODE_DWARF else if (T.getArch() == Triple::aarch64 || T.getArch() == Triple::aarch64_32) CompactUnwindDwarfEHFrameOnly = 0x03000000; // UNWIND_ARM64_MODE_DWARF else if (T.getArch() == Triple::arm || T.getArch() == Triple::thumb) CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_ARM_MODE_DWARF } // Debug Information. DwarfDebugNamesSection = Ctx->getMachOSection("__DWARF", "__debug_names", MachO::S_ATTR_DEBUG, SectionKind::getMetadata(), "debug_names_begin"); 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"); DwarfSwiftASTSection = Ctx->getMachOSection("__DWARF", "__swift_ast", MachO::S_ATTR_DEBUG, SectionKind::getMetadata()); 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"); DwarfLineStrSection = Ctx->getMachOSection("__DWARF", "__debug_line_str", MachO::S_ATTR_DEBUG, SectionKind::getMetadata(), "section_line_str"); 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"); DwarfStrOffSection = Ctx->getMachOSection("__DWARF", "__debug_str_offs", MachO::S_ATTR_DEBUG, SectionKind::getMetadata(), "section_str_off"); DwarfAddrSection = Ctx->getMachOSection("__DWARF", "__debug_addr", MachO::S_ATTR_DEBUG, SectionKind::getMetadata(), "section_info"); DwarfLocSection = Ctx->getMachOSection("__DWARF", "__debug_loc", MachO::S_ATTR_DEBUG, SectionKind::getMetadata(), "section_debug_loc"); DwarfLoclistsSection = Ctx->getMachOSection("__DWARF", "__debug_loclists", 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"); DwarfRnglistsSection = Ctx->getMachOSection("__DWARF", "__debug_rnglists", MachO::S_ATTR_DEBUG, SectionKind::getMetadata(), "debug_range"); DwarfMacinfoSection = Ctx->getMachOSection("__DWARF", "__debug_macinfo", MachO::S_ATTR_DEBUG, SectionKind::getMetadata(), "debug_macinfo"); DwarfMacroSection = Ctx->getMachOSection("__DWARF", "__debug_macro", MachO::S_ATTR_DEBUG, SectionKind::getMetadata(), "debug_macro"); DwarfDebugInlineSection = Ctx->getMachOSection("__DWARF", "__debug_inlined", MachO::S_ATTR_DEBUG, SectionKind::getMetadata()); DwarfCUIndexSection = Ctx->getMachOSection("__DWARF", "__debug_cu_index", MachO::S_ATTR_DEBUG, SectionKind::getMetadata()); DwarfTUIndexSection = Ctx->getMachOSection("__DWARF", "__debug_tu_index", MachO::S_ATTR_DEBUG, SectionKind::getMetadata()); StackMapSection = Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps", 0, SectionKind::getMetadata()); FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps", 0, SectionKind::getMetadata()); RemarksSection = Ctx->getMachOSection( "__LLVM", "__remarks", MachO::S_ATTR_DEBUG, SectionKind::getMetadata()); TLSExtraDataSection = TLSTLVSection; } void MCObjectFileInfo::initELFMCObjectFileInfo(const Triple &T, bool Large) { switch (T.getArch()) { case Triple::mips: case Triple::mipsel: case Triple::mips64: case Triple::mips64el: // We cannot use DW_EH_PE_sdata8 for the large PositionIndependent case // since there is no R_MIPS_PC64 relocation (only a 32-bit version). if (PositionIndependent && !Large) FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; else FDECFIEncoding = Ctx->getAsmInfo()->getCodePointerSize() == 4 ? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8; break; case Triple::ppc64: case Triple::ppc64le: case Triple::x86_64: FDECFIEncoding = dwarf::DW_EH_PE_pcrel | (Large ? dwarf::DW_EH_PE_sdata8 : dwarf::DW_EH_PE_sdata4); break; case Triple::bpfel: case Triple::bpfeb: FDECFIEncoding = dwarf::DW_EH_PE_sdata8; break; case Triple::hexagon: FDECFIEncoding = PositionIndependent ? dwarf::DW_EH_PE_pcrel : dwarf::DW_EH_PE_absptr; break; default: FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; break; } unsigned EHSectionType = T.getArch() == Triple::x86_64 ? ELF::SHT_X86_64_UNWIND : ELF::SHT_PROGBITS; // Solaris requires different flags for .eh_frame to seemingly every other // platform. unsigned EHSectionFlags = ELF::SHF_ALLOC; if (T.isOSSolaris() && T.getArch() != Triple::x86_64) 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); DataRelROSection = Ctx->getELFSection(".data.rel.ro", 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, ""); MergeableConst32Section = Ctx->getELFSection(".rodata.cst32", ELF::SHT_PROGBITS, ELF::SHF_ALLOC | ELF::SHF_MERGE, 32, ""); // 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; COFFDebugTypesSection = nullptr; unsigned DebugSecType = ELF::SHT_PROGBITS; // MIPS .debug_* sections should have SHT_MIPS_DWARF section type // to distinguish among sections contain DWARF and ECOFF debug formats. // Sections with ECOFF debug format are obsoleted and marked by SHT_PROGBITS. if (T.isMIPS()) DebugSecType = ELF::SHT_MIPS_DWARF; // Debug Info Sections. DwarfAbbrevSection = Ctx->getELFSection(".debug_abbrev", DebugSecType, 0); DwarfInfoSection = Ctx->getELFSection(".debug_info", DebugSecType, 0); DwarfLineSection = Ctx->getELFSection(".debug_line", DebugSecType, 0); DwarfLineStrSection = Ctx->getELFSection(".debug_line_str", DebugSecType, ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, ""); DwarfFrameSection = Ctx->getELFSection(".debug_frame", DebugSecType, 0); DwarfPubNamesSection = Ctx->getELFSection(".debug_pubnames", DebugSecType, 0); DwarfPubTypesSection = Ctx->getELFSection(".debug_pubtypes", DebugSecType, 0); DwarfGnuPubNamesSection = Ctx->getELFSection(".debug_gnu_pubnames", DebugSecType, 0); DwarfGnuPubTypesSection = Ctx->getELFSection(".debug_gnu_pubtypes", DebugSecType, 0); DwarfStrSection = Ctx->getELFSection(".debug_str", DebugSecType, ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, ""); DwarfLocSection = Ctx->getELFSection(".debug_loc", DebugSecType, 0); DwarfARangesSection = Ctx->getELFSection(".debug_aranges", DebugSecType, 0); DwarfRangesSection = Ctx->getELFSection(".debug_ranges", DebugSecType, 0); DwarfMacinfoSection = Ctx->getELFSection(".debug_macinfo", DebugSecType, 0); DwarfMacroSection = Ctx->getELFSection(".debug_macro", DebugSecType, 0); // DWARF5 Experimental Debug Info // Accelerator Tables DwarfDebugNamesSection = Ctx->getELFSection(".debug_names", ELF::SHT_PROGBITS, 0); DwarfAccelNamesSection = Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0); DwarfAccelObjCSection = Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0); DwarfAccelNamespaceSection = Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0); DwarfAccelTypesSection = Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0); // String Offset and Address Sections DwarfStrOffSection = Ctx->getELFSection(".debug_str_offsets", DebugSecType, 0); DwarfAddrSection = Ctx->getELFSection(".debug_addr", DebugSecType, 0); DwarfRnglistsSection = Ctx->getELFSection(".debug_rnglists", DebugSecType, 0); DwarfLoclistsSection = Ctx->getELFSection(".debug_loclists", DebugSecType, 0); // Fission Sections DwarfInfoDWOSection = Ctx->getELFSection(".debug_info.dwo", DebugSecType, ELF::SHF_EXCLUDE); DwarfTypesDWOSection = Ctx->getELFSection(".debug_types.dwo", DebugSecType, ELF::SHF_EXCLUDE); DwarfAbbrevDWOSection = Ctx->getELFSection(".debug_abbrev.dwo", DebugSecType, ELF::SHF_EXCLUDE); DwarfStrDWOSection = Ctx->getELFSection( ".debug_str.dwo", DebugSecType, ELF::SHF_MERGE | ELF::SHF_STRINGS | ELF::SHF_EXCLUDE, 1, ""); DwarfLineDWOSection = Ctx->getELFSection(".debug_line.dwo", DebugSecType, ELF::SHF_EXCLUDE); DwarfLocDWOSection = Ctx->getELFSection(".debug_loc.dwo", DebugSecType, ELF::SHF_EXCLUDE); DwarfStrOffDWOSection = Ctx->getELFSection(".debug_str_offsets.dwo", DebugSecType, ELF::SHF_EXCLUDE); DwarfRnglistsDWOSection = Ctx->getELFSection(".debug_rnglists.dwo", DebugSecType, ELF::SHF_EXCLUDE); DwarfMacinfoDWOSection = Ctx->getELFSection(".debug_macinfo.dwo", DebugSecType, ELF::SHF_EXCLUDE); DwarfMacroDWOSection = Ctx->getELFSection(".debug_macro.dwo", DebugSecType, ELF::SHF_EXCLUDE); DwarfLoclistsDWOSection = Ctx->getELFSection(".debug_loclists.dwo", DebugSecType, ELF::SHF_EXCLUDE); // DWP Sections DwarfCUIndexSection = Ctx->getELFSection(".debug_cu_index", DebugSecType, 0); DwarfTUIndexSection = Ctx->getELFSection(".debug_tu_index", DebugSecType, 0); StackMapSection = Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); FaultMapSection = Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC); EHFrameSection = Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags); StackSizesSection = Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, 0); } void MCObjectFileInfo::initCOFFMCObjectFileInfo(const Triple &T) { EHFrameSection = Ctx->getCOFFSection(".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getData()); // Set the `IMAGE_SCN_MEM_16BIT` flag when compiling for thumb mode. This is // used to indicate to the linker that the text segment contains thumb instructions // and to set the ISA selection bit for calls accordingly. const bool IsThumb = 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", (IsThumb ? 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::getData()); ReadOnlySection = Ctx->getCOFFSection( ".rdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getReadOnly()); if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::aarch64) { // On Windows 64 with SEH, the LSDA is emitted into the .xdata section LSDASection = nullptr; } 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$S", (COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ), SectionKind::getMetadata()); COFFDebugTypesSection = Ctx->getCOFFSection(".debug$T", (COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ), SectionKind::getMetadata()); COFFGlobalTypeHashesSection = Ctx->getCOFFSection( ".debug$H", (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"); DwarfLineStrSection = Ctx->getCOFFSection( ".debug_line_str", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata(), "section_line_str"); 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"); DwarfStrOffSection = Ctx->getCOFFSection( ".debug_str_offsets", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata(), "section_str_off"); 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"); DwarfLoclistsSection = Ctx->getCOFFSection( ".debug_loclists", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata(), "section_debug_loclists"); 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"); DwarfRnglistsSection = Ctx->getCOFFSection( ".debug_rnglists", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata(), "debug_rnglists"); DwarfMacinfoSection = Ctx->getCOFFSection( ".debug_macinfo", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata(), "debug_macinfo"); DwarfMacroSection = Ctx->getCOFFSection( ".debug_macro", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata(), "debug_macro"); DwarfMacinfoDWOSection = Ctx->getCOFFSection( ".debug_macinfo.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata(), "debug_macinfo.dwo"); DwarfMacroDWOSection = Ctx->getCOFFSection( ".debug_macro.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata(), "debug_macro.dwo"); 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(), "section_str_off_dwo"); 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"); DwarfCUIndexSection = Ctx->getCOFFSection( ".debug_cu_index", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfTUIndexSection = Ctx->getCOFFSection( ".debug_tu_index", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfDebugNamesSection = Ctx->getCOFFSection( ".debug_names", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata(), "debug_names_begin"); 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::getData()); XDataSection = Ctx->getCOFFSection( ".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getData()); SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO, SectionKind::getMetadata()); GFIDsSection = Ctx->getCOFFSection(".gfids$y", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); GLJMPSection = Ctx->getCOFFSection(".gljmp$y", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); TLSDataSection = Ctx->getCOFFSection( ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, SectionKind::getData()); StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getReadOnly()); } void MCObjectFileInfo::initWasmMCObjectFileInfo(const Triple &T) { TextSection = Ctx->getWasmSection(".text", SectionKind::getText()); DataSection = Ctx->getWasmSection(".data", SectionKind::getData()); DwarfLineSection = Ctx->getWasmSection(".debug_line", SectionKind::getMetadata()); DwarfLineStrSection = Ctx->getWasmSection(".debug_line_str", SectionKind::getMetadata()); DwarfStrSection = Ctx->getWasmSection(".debug_str", SectionKind::getMetadata()); DwarfLocSection = Ctx->getWasmSection(".debug_loc", SectionKind::getMetadata()); DwarfAbbrevSection = Ctx->getWasmSection(".debug_abbrev", SectionKind::getMetadata()); DwarfARangesSection = Ctx->getWasmSection(".debug_aranges", SectionKind::getMetadata()); DwarfRangesSection = Ctx->getWasmSection(".debug_ranges", SectionKind::getMetadata()); DwarfMacinfoSection = Ctx->getWasmSection(".debug_macinfo", SectionKind::getMetadata()); DwarfMacroSection = Ctx->getWasmSection(".debug_macro", SectionKind::getMetadata()); DwarfCUIndexSection = Ctx->getWasmSection(".debug_cu_index", SectionKind::getMetadata()); DwarfTUIndexSection = Ctx->getWasmSection(".debug_tu_index", SectionKind::getMetadata()); DwarfInfoSection = Ctx->getWasmSection(".debug_info", SectionKind::getMetadata()); DwarfFrameSection = Ctx->getWasmSection(".debug_frame", SectionKind::getMetadata()); DwarfPubNamesSection = Ctx->getWasmSection(".debug_pubnames", SectionKind::getMetadata()); DwarfPubTypesSection = Ctx->getWasmSection(".debug_pubtypes", SectionKind::getMetadata()); DwarfDebugNamesSection = Ctx->getWasmSection(".debug_names", SectionKind::getMetadata()); DwarfStrOffSection = Ctx->getWasmSection(".debug_str_offsets", SectionKind::getMetadata()); DwarfAddrSection = Ctx->getWasmSection(".debug_addr", SectionKind::getMetadata()); DwarfRnglistsSection = Ctx->getWasmSection(".debug_rnglists", SectionKind::getMetadata()); DwarfLoclistsSection = Ctx->getWasmSection(".debug_loclists", SectionKind::getMetadata()); // Wasm use data section for LSDA. // TODO Consider putting each function's exception table in a separate // section, as in -function-sections, to facilitate lld's --gc-section. LSDASection = Ctx->getWasmSection(".rodata.gcc_except_table", SectionKind::getReadOnlyWithRel()); // TODO: Define more sections. } void MCObjectFileInfo::initXCOFFMCObjectFileInfo(const Triple &T) { // The default csect for program code. Functions without a specified section // get placed into this csect. The choice of csect name is not a property of // the ABI or object file format. For example, the XL compiler uses an unnamed // csect for program code. TextSection = Ctx->getXCOFFSection( ".text", XCOFF::StorageMappingClass::XMC_PR, XCOFF::XTY_SD, XCOFF::C_HIDEXT, SectionKind::getText()); DataSection = Ctx->getXCOFFSection( ".data", XCOFF::StorageMappingClass::XMC_RW, XCOFF::XTY_SD, XCOFF::C_HIDEXT, SectionKind::getData()); ReadOnlySection = Ctx->getXCOFFSection( ".rodata", XCOFF::StorageMappingClass::XMC_RO, XCOFF::XTY_SD, XCOFF::C_HIDEXT, SectionKind::getReadOnly()); TOCBaseSection = Ctx->getXCOFFSection( "TOC", XCOFF::StorageMappingClass::XMC_TC0, XCOFF::XTY_SD, XCOFF::C_HIDEXT, SectionKind::getData()); // The TOC-base always has 0 size, but 4 byte alignment. TOCBaseSection->setAlignment(Align(4)); // DWARF sections for XCOFF are not csects. They are special STYP_DWARF // sections, and the individual DWARF sections are distinguished by their // section subtype. // TODO: Populate the DWARF sections appropriately. DwarfAbbrevSection = nullptr; // SSUBTYP_DWABREV DwarfInfoSection = nullptr; // SSUBTYP_DWINFO DwarfLineSection = nullptr; // SSUBTYP_DWLINE DwarfFrameSection = nullptr; // SSUBTYP_DWFRAME DwarfPubNamesSection = nullptr; // SSUBTYP_DWPBNMS DwarfPubTypesSection = nullptr; // SSUBTYP_DWPBTYP DwarfStrSection = nullptr; // SSUBTYP_DWSTR DwarfLocSection = nullptr; // SSUBTYP_DWLOC DwarfARangesSection = nullptr; // SSUBTYP_DWARNGE DwarfRangesSection = nullptr; // SSUBTYP_DWRNGES DwarfMacinfoSection = nullptr; // SSUBTYP_DWMAC } void MCObjectFileInfo::InitMCObjectFileInfo(const Triple &TheTriple, bool PIC, MCContext &ctx, bool LargeCodeModel) { PositionIndependent = PIC; Ctx = &ctx; // Common. CommDirectiveSupportsAlignment = true; SupportsWeakOmittedEHFrame = true; SupportsCompactUnwindWithoutEHFrame = false; OmitDwarfIfHaveCompactUnwind = false; FDECFIEncoding = 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 = TheTriple; switch (TT.getObjectFormat()) { case Triple::MachO: Env = IsMachO; initMachOMCObjectFileInfo(TT); break; case Triple::COFF: if (!TT.isOSWindows()) report_fatal_error( "Cannot initialize MC for non-Windows COFF object files."); Env = IsCOFF; initCOFFMCObjectFileInfo(TT); break; case Triple::ELF: Env = IsELF; initELFMCObjectFileInfo(TT, LargeCodeModel); break; case Triple::Wasm: Env = IsWasm; initWasmMCObjectFileInfo(TT); break; case Triple::XCOFF: Env = IsXCOFF; initXCOFFMCObjectFileInfo(TT); break; case Triple::UnknownObjectFormat: report_fatal_error("Cannot initialize MC for unknown object file format."); break; } } MCSection *MCObjectFileInfo::getDwarfComdatSection(const char *Name, uint64_t Hash) const { switch (TT.getObjectFormat()) { case Triple::ELF: return Ctx->getELFSection(Name, ELF::SHT_PROGBITS, ELF::SHF_GROUP, 0, utostr(Hash)); case Triple::MachO: case Triple::COFF: case Triple::Wasm: case Triple::XCOFF: case Triple::UnknownObjectFormat: report_fatal_error("Cannot get DWARF comdat section for this object file " "format: not implemented."); break; } llvm_unreachable("Unknown ObjectFormatType"); } MCSection * MCObjectFileInfo::getStackSizesSection(const MCSection &TextSec) const { if (Env != IsELF) return StackSizesSection; const MCSectionELF &ElfSec = static_cast(TextSec); unsigned Flags = ELF::SHF_LINK_ORDER; StringRef GroupName; if (const MCSymbol *Group = ElfSec.getGroup()) { GroupName = Group->getName(); Flags |= ELF::SHF_GROUP; } return Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, Flags, 0, GroupName, MCSection::NonUniqueID, cast(TextSec.getBeginSymbol())); }