//===-- 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/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/ADT/Triple.h" using namespace llvm; void MCObjectFileInfo::InitMachOMCObjectFileInfo(Triple T) { // MachO IsFunctionEHFrameSymbolPrivate = false; SupportsWeakOmittedEHFrame = false; PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; LSDAEncoding = FDEEncoding = 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", MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, SectionKind::getText()); DataSection // .data = Ctx->getMachOSection("__DATA", "__data", 0, SectionKind::getDataRel()); TLSDataSection // .tdata = Ctx->getMachOSection("__DATA", "__thread_data", MCSectionMachO::S_THREAD_LOCAL_REGULAR, SectionKind::getDataRel()); TLSBSSSection // .tbss = Ctx->getMachOSection("__DATA", "__thread_bss", MCSectionMachO::S_THREAD_LOCAL_ZEROFILL, SectionKind::getThreadBSS()); // TODO: Verify datarel below. TLSTLVSection // .tlv = Ctx->getMachOSection("__DATA", "__thread_vars", MCSectionMachO::S_THREAD_LOCAL_VARIABLES, SectionKind::getDataRel()); TLSThreadInitSection = Ctx->getMachOSection("__DATA", "__thread_init", MCSectionMachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS, SectionKind::getDataRel()); CStringSection // .cstring = Ctx->getMachOSection("__TEXT", "__cstring", MCSectionMachO::S_CSTRING_LITERALS, SectionKind::getMergeable1ByteCString()); UStringSection = Ctx->getMachOSection("__TEXT","__ustring", 0, SectionKind::getMergeable2ByteCString()); FourByteConstantSection // .literal4 = Ctx->getMachOSection("__TEXT", "__literal4", MCSectionMachO::S_4BYTE_LITERALS, SectionKind::getMergeableConst4()); EightByteConstantSection // .literal8 = Ctx->getMachOSection("__TEXT", "__literal8", MCSectionMachO::S_8BYTE_LITERALS, SectionKind::getMergeableConst8()); // ld_classic doesn't support .literal16 in 32-bit mode, and ld64 falls back // to using it in -static mode. SixteenByteConstantSection = 0; if (RelocM != Reloc::Static && T.getArch() != Triple::x86_64 && T.getArch() != Triple::ppc64) SixteenByteConstantSection = // .literal16 Ctx->getMachOSection("__TEXT", "__literal16", MCSectionMachO::S_16BYTE_LITERALS, SectionKind::getMergeableConst16()); ReadOnlySection // .const = Ctx->getMachOSection("__TEXT", "__const", 0, SectionKind::getReadOnly()); TextCoalSection = Ctx->getMachOSection("__TEXT", "__textcoal_nt", MCSectionMachO::S_COALESCED | MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS, SectionKind::getText()); ConstTextCoalSection = Ctx->getMachOSection("__TEXT", "__const_coal", MCSectionMachO::S_COALESCED, SectionKind::getReadOnly()); ConstDataSection // .const_data = Ctx->getMachOSection("__DATA", "__const", 0, SectionKind::getReadOnlyWithRel()); DataCoalSection = Ctx->getMachOSection("__DATA","__datacoal_nt", MCSectionMachO::S_COALESCED, SectionKind::getDataRel()); DataCommonSection = Ctx->getMachOSection("__DATA","__common", MCSectionMachO::S_ZEROFILL, SectionKind::getBSS()); DataBSSSection = Ctx->getMachOSection("__DATA","__bss", MCSectionMachO::S_ZEROFILL, SectionKind::getBSS()); LazySymbolPointerSection = Ctx->getMachOSection("__DATA", "__la_symbol_ptr", MCSectionMachO::S_LAZY_SYMBOL_POINTERS, SectionKind::getMetadata()); NonLazySymbolPointerSection = Ctx->getMachOSection("__DATA", "__nl_symbol_ptr", MCSectionMachO::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", MCSectionMachO::S_MOD_INIT_FUNC_POINTERS, SectionKind::getDataRel()); StaticDtorSection = Ctx->getMachOSection("__DATA", "__mod_term_func", MCSectionMachO::S_MOD_TERM_FUNC_POINTERS, SectionKind::getDataRel()); } // Exception Handling. LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0, SectionKind::getReadOnlyWithRel()); if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6)) CompactUnwindSection = Ctx->getMachOSection("__LD", "__compact_unwind", MCSectionMachO::S_ATTR_DEBUG, SectionKind::getReadOnly()); // Debug Information. DwarfAbbrevSection = Ctx->getMachOSection("__DWARF", "__debug_abbrev", MCSectionMachO::S_ATTR_DEBUG, SectionKind::getMetadata()); DwarfInfoSection = Ctx->getMachOSection("__DWARF", "__debug_info", MCSectionMachO::S_ATTR_DEBUG, SectionKind::getMetadata()); DwarfLineSection = Ctx->getMachOSection("__DWARF", "__debug_line", MCSectionMachO::S_ATTR_DEBUG, SectionKind::getMetadata()); DwarfFrameSection = Ctx->getMachOSection("__DWARF", "__debug_frame", MCSectionMachO::S_ATTR_DEBUG, SectionKind::getMetadata()); DwarfPubNamesSection = Ctx->getMachOSection("__DWARF", "__debug_pubnames", MCSectionMachO::S_ATTR_DEBUG, SectionKind::getMetadata()); DwarfPubTypesSection = Ctx->getMachOSection("__DWARF", "__debug_pubtypes", MCSectionMachO::S_ATTR_DEBUG, SectionKind::getMetadata()); DwarfStrSection = Ctx->getMachOSection("__DWARF", "__debug_str", MCSectionMachO::S_ATTR_DEBUG, SectionKind::getMetadata()); DwarfLocSection = Ctx->getMachOSection("__DWARF", "__debug_loc", MCSectionMachO::S_ATTR_DEBUG, SectionKind::getMetadata()); DwarfARangesSection = Ctx->getMachOSection("__DWARF", "__debug_aranges", MCSectionMachO::S_ATTR_DEBUG, SectionKind::getMetadata()); DwarfRangesSection = Ctx->getMachOSection("__DWARF", "__debug_ranges", MCSectionMachO::S_ATTR_DEBUG, SectionKind::getMetadata()); DwarfMacroInfoSection = Ctx->getMachOSection("__DWARF", "__debug_macinfo", MCSectionMachO::S_ATTR_DEBUG, SectionKind::getMetadata()); DwarfDebugInlineSection = Ctx->getMachOSection("__DWARF", "__debug_inlined", MCSectionMachO::S_ATTR_DEBUG, SectionKind::getMetadata()); TLSExtraDataSection = TLSTLVSection; } void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) { if (T.getArch() == 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; FDEEncoding = FDECFIEncoding = (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; } else if (T.getArch() == Triple::x86_64) { FDECFIEncoding = 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 | ((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); FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4; 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; FDEEncoding = dwarf::DW_EH_PE_udata4; TTypeEncoding = (CMModel == CodeModel::Small) ? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr; } } // ELF BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS, ELF::SHF_WRITE |ELF::SHF_ALLOC, SectionKind::getBSS()); TextSection = Ctx->getELFSection(".text", ELF::SHT_PROGBITS, ELF::SHF_EXECINSTR | ELF::SHF_ALLOC, SectionKind::getText()); DataSection = Ctx->getELFSection(".data", ELF::SHT_PROGBITS, ELF::SHF_WRITE |ELF::SHF_ALLOC, SectionKind::getDataRel()); ReadOnlySection = Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC, SectionKind::getReadOnly()); TLSDataSection = Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE, SectionKind::getThreadData()); TLSBSSSection = Ctx->getELFSection(".tbss", ELF::SHT_NOBITS, ELF::SHF_ALLOC | ELF::SHF_TLS | ELF::SHF_WRITE, SectionKind::getThreadBSS()); DataRelSection = Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS, ELF::SHF_ALLOC |ELF::SHF_WRITE, SectionKind::getDataRel()); DataRelLocalSection = Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS, ELF::SHF_ALLOC |ELF::SHF_WRITE, SectionKind::getDataRelLocal()); DataRelROSection = Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS, ELF::SHF_ALLOC |ELF::SHF_WRITE, SectionKind::getReadOnlyWithRel()); DataRelROLocalSection = Ctx->getELFSection(".data.rel.ro.local", ELF::SHT_PROGBITS, ELF::SHF_ALLOC |ELF::SHF_WRITE, SectionKind::getReadOnlyWithRelLocal()); MergeableConst4Section = Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS, ELF::SHF_ALLOC |ELF::SHF_MERGE, SectionKind::getMergeableConst4()); MergeableConst8Section = Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS, ELF::SHF_ALLOC |ELF::SHF_MERGE, SectionKind::getMergeableConst8()); MergeableConst16Section = Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS, ELF::SHF_ALLOC |ELF::SHF_MERGE, SectionKind::getMergeableConst16()); StaticCtorSection = Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS, ELF::SHF_ALLOC |ELF::SHF_WRITE, SectionKind::getDataRel()); StaticDtorSection = Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS, ELF::SHF_ALLOC |ELF::SHF_WRITE, SectionKind::getDataRel()); // 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, SectionKind::getReadOnly()); // Debug Info Sections. DwarfAbbrevSection = Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0, SectionKind::getMetadata()); DwarfInfoSection = Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0, SectionKind::getMetadata()); DwarfLineSection = Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0, SectionKind::getMetadata()); DwarfFrameSection = Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0, SectionKind::getMetadata()); DwarfPubNamesSection = Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0, SectionKind::getMetadata()); DwarfPubTypesSection = Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0, SectionKind::getMetadata()); DwarfStrSection = Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS, 0, SectionKind::getMetadata()); DwarfLocSection = Ctx->getELFSection(".debug_loc", ELF::SHT_PROGBITS, 0, SectionKind::getMetadata()); DwarfARangesSection = Ctx->getELFSection(".debug_aranges", ELF::SHT_PROGBITS, 0, SectionKind::getMetadata()); DwarfRangesSection = Ctx->getELFSection(".debug_ranges", ELF::SHT_PROGBITS, 0, SectionKind::getMetadata()); DwarfMacroInfoSection = Ctx->getELFSection(".debug_macinfo", ELF::SHT_PROGBITS, 0, SectionKind::getMetadata()); } void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) { // COFF TextSection = Ctx->getCOFFSection(".text", 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()); 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. LSDASection = Ctx->getCOFFSection(".gcc_except_table", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getReadOnly()); // Debug info. DwarfAbbrevSection = Ctx->getCOFFSection(".debug_abbrev", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfInfoSection = Ctx->getCOFFSection(".debug_info", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfLineSection = Ctx->getCOFFSection(".debug_line", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfFrameSection = Ctx->getCOFFSection(".debug_frame", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfPubNamesSection = Ctx->getCOFFSection(".debug_pubnames", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfPubTypesSection = Ctx->getCOFFSection(".debug_pubtypes", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfStrSection = Ctx->getCOFFSection(".debug_str", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfLocSection = Ctx->getCOFFSection(".debug_loc", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfARangesSection = Ctx->getCOFFSection(".debug_aranges", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfRangesSection = Ctx->getCOFFSection(".debug_ranges", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfMacroInfoSection = Ctx->getCOFFSection(".debug_macinfo", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DrectveSection = Ctx->getCOFFSection(".drectve", COFF::IMAGE_SCN_LNK_INFO, SectionKind::getMetadata()); PDataSection = Ctx->getCOFFSection(".pdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, SectionKind::getDataRel()); XDataSection = Ctx->getCOFFSection(".xdata", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, SectionKind::getDataRel()); } void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model relocm, CodeModel::Model cm, MCContext &ctx) { RelocM = relocm; CMModel = cm; Ctx = &ctx; // Common. CommDirectiveSupportsAlignment = true; SupportsWeakOmittedEHFrame = true; IsFunctionEHFrameSymbolPrivate = true; PersonalityEncoding = LSDAEncoding = FDEEncoding = FDECFIEncoding = TTypeEncoding = dwarf::DW_EH_PE_absptr; EHFrameSection = 0; // Created on demand. Triple T(TT); Triple::ArchType Arch = T.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::ppc || Arch == Triple::ppc64 || Arch == Triple::UnknownArch) && (T.isOSDarwin() || T.getEnvironment() == Triple::MachO)) { Env = IsMachO; InitMachOMCObjectFileInfo(T); } else if ((Arch == Triple::x86 || Arch == Triple::x86_64) && (T.getOS() == Triple::MinGW32 || T.getOS() == Triple::Cygwin || T.getOS() == Triple::Win32)) { Env = IsCOFF; InitCOFFMCObjectFileInfo(T); } else { Env = IsELF; InitELFMCObjectFileInfo(T); } } void MCObjectFileInfo::InitEHFrameSection() { if (Env == IsMachO) EHFrameSection = Ctx->getMachOSection("__TEXT", "__eh_frame", MCSectionMachO::S_COALESCED | MCSectionMachO::S_ATTR_NO_TOC | MCSectionMachO::S_ATTR_STRIP_STATIC_SYMS | MCSectionMachO::S_ATTR_LIVE_SUPPORT, SectionKind::getReadOnly()); else if (Env == IsELF) EHFrameSection = Ctx->getELFSection(".eh_frame", ELF::SHT_PROGBITS, ELF::SHF_ALLOC, SectionKind::getDataRel()); else EHFrameSection = Ctx->getCOFFSection(".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, SectionKind::getDataRel()); }