diff options
Diffstat (limited to 'lib/MC/MCObjectFileInfo.cpp')
| -rw-r--r-- | lib/MC/MCObjectFileInfo.cpp | 136 |
1 files changed, 88 insertions, 48 deletions
diff --git a/lib/MC/MCObjectFileInfo.cpp b/lib/MC/MCObjectFileInfo.cpp index 9d413af..d490ef3 100644 --- a/lib/MC/MCObjectFileInfo.cpp +++ b/lib/MC/MCObjectFileInfo.cpp @@ -18,9 +18,29 @@ #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::arm64 || 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 - IsFunctionEHFrameSymbolPrivate = false; SupportsWeakOmittedEHFrame = false; if (T.isOSDarwin() && @@ -151,13 +171,10 @@ void MCObjectFileInfo::InitMachOMCObjectFileInfo(Triple T) { COFFDebugSymbolsSection = nullptr; - if ((T.isMacOSX() && !T.isMacOSXVersionLT(10, 6)) || - (T.isOSDarwin() && - (T.getArch() == Triple::arm64 || T.getArch() == Triple::aarch64))) { + if (useCompactUnwind(T)) { CompactUnwindSection = - Ctx->getMachOSection("__LD", "__compact_unwind", - MachO::S_ATTR_DEBUG, - SectionKind::getReadOnly()); + Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG, + SectionKind::getReadOnly()); if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86) CompactUnwindDwarfEHFrameOnly = 0x04000000; @@ -321,6 +338,13 @@ void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) { TTypeEncoding = dwarf::DW_EH_PE_absptr; } break; + case Triple::mips: + case Triple::mipsel: + // MIPS uses indirect pointer to refer personality functions, so that the + // eh_frame section can be read-only. DW.ref.personality will be generated + // for relocation. + PersonalityEncoding = dwarf::DW_EH_PE_indirect; + break; case Triple::ppc64: case Triple::ppc64le: PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | @@ -562,6 +586,8 @@ void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) { void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) { + bool IsWoA = T.getArch() == Triple::arm || T.getArch() == Triple::thumb; + // The object file format cannot represent common symbols with explicit // alignments. CommDirectiveSupportsAlignment = false; @@ -575,6 +601,8 @@ void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) { 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, @@ -590,12 +618,18 @@ void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) { COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getReadOnly()); - if (T.isKnownWindowsMSVCEnvironment()) { + + 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", @@ -603,16 +637,6 @@ void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) { COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE, SectionKind::getDataRel()); - } - - - if (T.isKnownWindowsMSVCEnvironment()) { - StaticDtorSection = - Ctx->getCOFFSection(".CRT$XTX", - COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | - COFF::IMAGE_SCN_MEM_READ, - SectionKind::getReadOnly()); - } else { StaticDtorSection = Ctx->getCOFFSection(".dtors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | @@ -625,11 +649,16 @@ void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) { // 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()); + 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 = @@ -705,36 +734,46 @@ void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) { COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfInfoDWOSection = - Ctx->getCOFFSection(".debug_info.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE | - COFF::IMAGE_SCN_MEM_READ, + Ctx->getCOFFSection(".debug_info.dwo", + COFF::IMAGE_SCN_MEM_DISCARDABLE | + COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfAbbrevDWOSection = - Ctx->getCOFFSection(".debug_abbrev.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE | - COFF::IMAGE_SCN_MEM_READ, + Ctx->getCOFFSection(".debug_abbrev.dwo", + COFF::IMAGE_SCN_MEM_DISCARDABLE | + COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfStrDWOSection = - Ctx->getCOFFSection(".debug_str.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE | - COFF::IMAGE_SCN_MEM_READ, + Ctx->getCOFFSection(".debug_str.dwo", + COFF::IMAGE_SCN_MEM_DISCARDABLE | + COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfLineDWOSection = - Ctx->getCOFFSection(".debug_line.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE | - COFF::IMAGE_SCN_MEM_READ, + Ctx->getCOFFSection(".debug_line.dwo", + COFF::IMAGE_SCN_MEM_DISCARDABLE | + COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfLocDWOSection = - Ctx->getCOFFSection(".debug_loc.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE | - COFF::IMAGE_SCN_MEM_READ, + Ctx->getCOFFSection(".debug_loc.dwo", + COFF::IMAGE_SCN_MEM_DISCARDABLE | + COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); DwarfStrOffDWOSection = - Ctx->getCOFFSection(".debug_str_offsets.dwo", COFF::IMAGE_SCN_MEM_DISCARDABLE | - COFF::IMAGE_SCN_MEM_READ, + Ctx->getCOFFSection(".debug_str_offsets.dwo", + COFF::IMAGE_SCN_MEM_DISCARDABLE | + COFF::IMAGE_SCN_MEM_READ, SectionKind::getMetadata()); - DwarfAddrSection = Ctx->getCOFFSection( - ".debug_addr", COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_MEM_READ, - SectionKind::getMetadata()); + + DwarfAddrSection = + Ctx->getCOFFSection(".debug_addr", + COFF::IMAGE_SCN_MEM_DISCARDABLE | + COFF::IMAGE_SCN_MEM_READ, + SectionKind::getMetadata()); DrectveSection = Ctx->getCOFFSection(".drectve", - COFF::IMAGE_SCN_LNK_INFO | COFF::IMAGE_SCN_LNK_REMOVE, + COFF::IMAGE_SCN_LNK_INFO | + COFF::IMAGE_SCN_LNK_REMOVE, SectionKind::getMetadata()); PDataSection = @@ -748,6 +787,7 @@ void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) { COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | COFF::IMAGE_SCN_MEM_READ, SectionKind::getDataRel()); + TLSDataSection = Ctx->getCOFFSection(".tls$", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | @@ -756,7 +796,7 @@ void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) { SectionKind::getDataRel()); } -void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model relocm, +void MCObjectFileInfo::InitMCObjectFileInfo(StringRef T, Reloc::Model relocm, CodeModel::Model cm, MCContext &ctx) { RelocM = relocm; @@ -766,7 +806,6 @@ void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model relocm, // Common. CommDirectiveSupportsAlignment = true; SupportsWeakOmittedEHFrame = true; - IsFunctionEHFrameSymbolPrivate = true; SupportsCompactUnwindWithoutEHFrame = false; PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding = @@ -781,8 +820,9 @@ void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model relocm, DwarfAccelNamespaceSection = nullptr; // Used only by selected targets. DwarfAccelTypesSection = nullptr; // Used only by selected targets. - Triple T(TT); - Triple::ArchType Arch = T.getArch(); + TT = Triple(T); + + 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 || @@ -790,17 +830,17 @@ void MCObjectFileInfo::InitMCObjectFileInfo(StringRef TT, Reloc::Model relocm, Arch == Triple::arm64 || Arch == Triple::aarch64 || Arch == Triple::ppc || Arch == Triple::ppc64 || Arch == Triple::UnknownArch) && - (T.isOSDarwin() || T.isOSBinFormatMachO())) { + (TT.isOSDarwin() || TT.isOSBinFormatMachO())) { Env = IsMachO; - InitMachOMCObjectFileInfo(T); + InitMachOMCObjectFileInfo(TT); } else if ((Arch == Triple::x86 || Arch == Triple::x86_64 || Arch == Triple::arm || Arch == Triple::thumb) && - (T.isOSWindows() && T.getObjectFormat() == Triple::COFF)) { + (TT.isOSWindows() && TT.getObjectFormat() == Triple::COFF)) { Env = IsCOFF; - InitCOFFMCObjectFileInfo(T); + InitCOFFMCObjectFileInfo(TT); } else { Env = IsELF; - InitELFMCObjectFileInfo(T); + InitELFMCObjectFileInfo(TT); } } |