| //===-- 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.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)) |
| 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.getArch() == Triple::x86_64 || T.getArch() == Triple::x86) |
| 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"); |
| 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: |
| 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); |
| |
| // 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); |
| |
| // 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); |
| |
| RemarksSection = |
| Ctx->getELFSection(".remarks", ELF::SHT_PROGBITS, ELF::SHF_EXCLUDE); |
| } |
| |
| 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"); |
| 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"); |
| 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"); |
| 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()); |
| |
| 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()); |
| DwarfAddrSection = Ctx->getWasmSection(".debug_addr", 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()); |
| |
| // 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()); |
| } |
| |
| 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<const MCSectionELF &>(TextSec); |
| unsigned Flags = ELF::SHF_LINK_ORDER; |
| StringRef GroupName; |
| if (const MCSymbol *Group = ElfSec.getGroup()) { |
| GroupName = Group->getName(); |
| Flags |= ELF::SHF_GROUP; |
| } |
| |
| const MCSymbol *Link = TextSec.getBeginSymbol(); |
| auto It = StackSizesUniquing.insert({Link, StackSizesUniquing.size()}); |
| unsigned UniqueID = It.first->second; |
| |
| return Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, Flags, 0, |
| GroupName, UniqueID, cast<MCSymbolELF>(Link)); |
| } |
