diff options
Diffstat (limited to 'contrib/llvm-project/llvm/lib/MC/MCObjectFileInfo.cpp')
| -rw-r--r-- | contrib/llvm-project/llvm/lib/MC/MCObjectFileInfo.cpp | 867 |
1 files changed, 867 insertions, 0 deletions
diff --git a/contrib/llvm-project/llvm/lib/MC/MCObjectFileInfo.cpp b/contrib/llvm-project/llvm/lib/MC/MCObjectFileInfo.cpp new file mode 100644 index 000000000000..9f555abe1404 --- /dev/null +++ b/contrib/llvm-project/llvm/lib/MC/MCObjectFileInfo.cpp @@ -0,0 +1,867 @@ +//===-- 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) + 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) + 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) + 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, SectionKind::getText()); +} + +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)); +} |