| //===-- 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()); |
| |
| FaultMapSection = Ctx->getMachOSection("__LLVM_FAULTMAPS", "__llvm_faultmaps", |
| 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 and types, so |
| // that the eh_frame section can be read-only. DW.ref.personality will be |
| // generated for relocation. |
| PersonalityEncoding = dwarf::DW_EH_PE_indirect; |
| // FIXME: The N64 ABI probably ought to use DW_EH_PE_sdata8 but we can't |
| // identify N64 from just a triple. |
| TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | |
| dwarf::DW_EH_PE_sdata4; |
| // We don't support PC-relative LSDA references in GAS so we use the default |
| // DW_EH_PE_absptr for those. |
| 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::sparcel: |
| 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); |
| |
| FaultMapSection = |
| Ctx->getELFSection(".llvm_faultmaps", 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()); |
| |
| SXDataSection = Ctx->getCOFFSection(".sxdata", COFF::IMAGE_SCN_LNK_INFO, |
| SectionKind::getMetadata()); |
| |
| TLSDataSection = Ctx->getCOFFSection( |
| ".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | |
| COFF::IMAGE_SCN_MEM_WRITE, |
| SectionKind::getDataRel()); |
| |
| StackMapSection = Ctx->getCOFFSection(".llvm_stackmaps", |
| COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | |
| COFF::IMAGE_SCN_MEM_READ, |
| SectionKind::getReadOnly()); |
| } |
| |
| void MCObjectFileInfo::InitMCObjectFileInfo(const Triple &TheTriple, |
| 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 = TheTriple; |
| |
| 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.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); |
| } |
| } |
| |
| void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model RM, |
| CodeModel::Model CM, |
| MCContext &ctx) { |
| InitMCObjectFileInfo(Triple(TT), RM, CM, ctx); |
| } |
| |
| 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()); |
| } |
