912 lines
36 KiB
C++
912 lines
36 KiB
C++
//===-- MObjectFileInfo.cpp - Object File Information ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCObjectFileInfo.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/MC/MCSectionCOFF.h"
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#include "llvm/MC/MCSectionELF.h"
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#include "llvm/MC/MCSectionMachO.h"
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using namespace llvm;
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static bool useCompactUnwind(const Triple &T) {
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// Only on darwin.
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if (!T.isOSDarwin())
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return false;
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// aarch64 always has it.
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if (T.getArch() == Triple::aarch64)
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return true;
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// Use it on newer version of OS X.
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if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6))
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return true;
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// And the iOS simulator.
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if (T.isiOS() &&
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(T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86))
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return true;
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return false;
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}
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void MCObjectFileInfo::InitMachOMCObjectFileInfo(Triple T) {
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// MachO
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SupportsWeakOmittedEHFrame = false;
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if (T.isOSDarwin() && T.getArch() == Triple::aarch64)
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SupportsCompactUnwindWithoutEHFrame = true;
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PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel
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| dwarf::DW_EH_PE_sdata4;
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LSDAEncoding = FDECFIEncoding = dwarf::DW_EH_PE_pcrel;
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TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
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dwarf::DW_EH_PE_sdata4;
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// .comm doesn't support alignment before Leopard.
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if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5))
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CommDirectiveSupportsAlignment = false;
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TextSection // .text
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= Ctx->getMachOSection("__TEXT", "__text",
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MachO::S_ATTR_PURE_INSTRUCTIONS,
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SectionKind::getText());
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DataSection // .data
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= Ctx->getMachOSection("__DATA", "__data", 0,
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SectionKind::getDataRel());
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// BSSSection might not be expected initialized on msvc.
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BSSSection = nullptr;
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TLSDataSection // .tdata
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= Ctx->getMachOSection("__DATA", "__thread_data",
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MachO::S_THREAD_LOCAL_REGULAR,
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SectionKind::getDataRel());
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TLSBSSSection // .tbss
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= Ctx->getMachOSection("__DATA", "__thread_bss",
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MachO::S_THREAD_LOCAL_ZEROFILL,
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SectionKind::getThreadBSS());
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// TODO: Verify datarel below.
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TLSTLVSection // .tlv
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= Ctx->getMachOSection("__DATA", "__thread_vars",
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MachO::S_THREAD_LOCAL_VARIABLES,
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SectionKind::getDataRel());
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TLSThreadInitSection
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= Ctx->getMachOSection("__DATA", "__thread_init",
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MachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS,
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SectionKind::getDataRel());
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CStringSection // .cstring
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= Ctx->getMachOSection("__TEXT", "__cstring",
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MachO::S_CSTRING_LITERALS,
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SectionKind::getMergeable1ByteCString());
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UStringSection
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= Ctx->getMachOSection("__TEXT","__ustring", 0,
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SectionKind::getMergeable2ByteCString());
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FourByteConstantSection // .literal4
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= Ctx->getMachOSection("__TEXT", "__literal4",
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MachO::S_4BYTE_LITERALS,
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SectionKind::getMergeableConst4());
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EightByteConstantSection // .literal8
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= Ctx->getMachOSection("__TEXT", "__literal8",
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MachO::S_8BYTE_LITERALS,
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SectionKind::getMergeableConst8());
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SixteenByteConstantSection // .literal16
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= Ctx->getMachOSection("__TEXT", "__literal16",
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MachO::S_16BYTE_LITERALS,
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SectionKind::getMergeableConst16());
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ReadOnlySection // .const
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= Ctx->getMachOSection("__TEXT", "__const", 0,
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SectionKind::getReadOnly());
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TextCoalSection
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= Ctx->getMachOSection("__TEXT", "__textcoal_nt",
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MachO::S_COALESCED |
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MachO::S_ATTR_PURE_INSTRUCTIONS,
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SectionKind::getText());
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ConstTextCoalSection
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= Ctx->getMachOSection("__TEXT", "__const_coal",
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MachO::S_COALESCED,
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SectionKind::getReadOnly());
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ConstDataSection // .const_data
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= Ctx->getMachOSection("__DATA", "__const", 0,
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SectionKind::getReadOnlyWithRel());
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DataCoalSection
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= Ctx->getMachOSection("__DATA","__datacoal_nt",
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MachO::S_COALESCED,
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SectionKind::getDataRel());
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DataCommonSection
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= Ctx->getMachOSection("__DATA","__common",
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MachO::S_ZEROFILL,
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SectionKind::getBSS());
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DataBSSSection
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= Ctx->getMachOSection("__DATA","__bss", MachO::S_ZEROFILL,
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SectionKind::getBSS());
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LazySymbolPointerSection
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= Ctx->getMachOSection("__DATA", "__la_symbol_ptr",
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MachO::S_LAZY_SYMBOL_POINTERS,
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SectionKind::getMetadata());
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NonLazySymbolPointerSection
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= Ctx->getMachOSection("__DATA", "__nl_symbol_ptr",
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MachO::S_NON_LAZY_SYMBOL_POINTERS,
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SectionKind::getMetadata());
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if (RelocM == Reloc::Static) {
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StaticCtorSection
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= Ctx->getMachOSection("__TEXT", "__constructor", 0,
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SectionKind::getDataRel());
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StaticDtorSection
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= Ctx->getMachOSection("__TEXT", "__destructor", 0,
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SectionKind::getDataRel());
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} else {
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StaticCtorSection
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= Ctx->getMachOSection("__DATA", "__mod_init_func",
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MachO::S_MOD_INIT_FUNC_POINTERS,
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SectionKind::getDataRel());
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StaticDtorSection
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= Ctx->getMachOSection("__DATA", "__mod_term_func",
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MachO::S_MOD_TERM_FUNC_POINTERS,
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SectionKind::getDataRel());
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}
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// Exception Handling.
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LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0,
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SectionKind::getReadOnlyWithRel());
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COFFDebugSymbolsSection = nullptr;
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if (useCompactUnwind(T)) {
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CompactUnwindSection =
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Ctx->getMachOSection("__LD", "__compact_unwind", MachO::S_ATTR_DEBUG,
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SectionKind::getReadOnly());
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if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)
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CompactUnwindDwarfEHFrameOnly = 0x04000000;
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else if (T.getArch() == Triple::aarch64)
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CompactUnwindDwarfEHFrameOnly = 0x03000000;
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}
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// Debug Information.
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DwarfAccelNamesSection =
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Ctx->getMachOSection("__DWARF", "__apple_names",
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MachO::S_ATTR_DEBUG,
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SectionKind::getMetadata());
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DwarfAccelObjCSection =
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Ctx->getMachOSection("__DWARF", "__apple_objc",
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MachO::S_ATTR_DEBUG,
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SectionKind::getMetadata());
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// 16 character section limit...
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DwarfAccelNamespaceSection =
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Ctx->getMachOSection("__DWARF", "__apple_namespac",
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MachO::S_ATTR_DEBUG,
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SectionKind::getMetadata());
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DwarfAccelTypesSection =
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Ctx->getMachOSection("__DWARF", "__apple_types",
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MachO::S_ATTR_DEBUG,
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SectionKind::getMetadata());
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DwarfAbbrevSection =
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Ctx->getMachOSection("__DWARF", "__debug_abbrev",
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MachO::S_ATTR_DEBUG,
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SectionKind::getMetadata());
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DwarfInfoSection =
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Ctx->getMachOSection("__DWARF", "__debug_info",
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MachO::S_ATTR_DEBUG,
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SectionKind::getMetadata());
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DwarfLineSection =
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Ctx->getMachOSection("__DWARF", "__debug_line",
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MachO::S_ATTR_DEBUG,
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SectionKind::getMetadata());
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DwarfFrameSection =
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Ctx->getMachOSection("__DWARF", "__debug_frame",
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MachO::S_ATTR_DEBUG,
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SectionKind::getMetadata());
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DwarfPubNamesSection =
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Ctx->getMachOSection("__DWARF", "__debug_pubnames",
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MachO::S_ATTR_DEBUG,
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SectionKind::getMetadata());
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DwarfPubTypesSection =
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Ctx->getMachOSection("__DWARF", "__debug_pubtypes",
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MachO::S_ATTR_DEBUG,
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SectionKind::getMetadata());
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DwarfGnuPubNamesSection =
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Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn",
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MachO::S_ATTR_DEBUG,
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SectionKind::getMetadata());
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DwarfGnuPubTypesSection =
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Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt",
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MachO::S_ATTR_DEBUG,
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SectionKind::getMetadata());
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DwarfStrSection =
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Ctx->getMachOSection("__DWARF", "__debug_str",
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MachO::S_ATTR_DEBUG,
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SectionKind::getMetadata());
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DwarfLocSection =
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Ctx->getMachOSection("__DWARF", "__debug_loc",
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MachO::S_ATTR_DEBUG,
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SectionKind::getMetadata());
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DwarfARangesSection =
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Ctx->getMachOSection("__DWARF", "__debug_aranges",
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MachO::S_ATTR_DEBUG,
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SectionKind::getMetadata());
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DwarfRangesSection =
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Ctx->getMachOSection("__DWARF", "__debug_ranges",
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MachO::S_ATTR_DEBUG,
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SectionKind::getMetadata());
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DwarfMacroInfoSection =
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Ctx->getMachOSection("__DWARF", "__debug_macinfo",
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MachO::S_ATTR_DEBUG,
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SectionKind::getMetadata());
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DwarfDebugInlineSection =
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Ctx->getMachOSection("__DWARF", "__debug_inlined",
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MachO::S_ATTR_DEBUG,
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SectionKind::getMetadata());
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StackMapSection =
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Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps", 0,
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SectionKind::getMetadata());
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TLSExtraDataSection = TLSTLVSection;
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}
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void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
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switch (T.getArch()) {
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case Triple::mips:
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case Triple::mipsel:
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FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
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break;
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case Triple::mips64:
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case Triple::mips64el:
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FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
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break;
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case Triple::x86_64:
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FDECFIEncoding = dwarf::DW_EH_PE_pcrel |
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((CMModel == CodeModel::Large) ? dwarf::DW_EH_PE_sdata8
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: dwarf::DW_EH_PE_sdata4);
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break;
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default:
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FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
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break;
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}
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switch (T.getArch()) {
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case Triple::arm:
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case Triple::armeb:
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case Triple::thumb:
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case Triple::thumbeb:
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if (Ctx->getAsmInfo()->getExceptionHandlingType() == ExceptionHandling::ARM)
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break;
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// Fallthrough if not using EHABI
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case Triple::ppc:
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case Triple::x86:
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PersonalityEncoding = (RelocM == Reloc::PIC_)
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? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
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: dwarf::DW_EH_PE_absptr;
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LSDAEncoding = (RelocM == Reloc::PIC_)
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? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
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: dwarf::DW_EH_PE_absptr;
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TTypeEncoding = (RelocM == Reloc::PIC_)
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? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
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: dwarf::DW_EH_PE_absptr;
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break;
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case Triple::x86_64:
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if (RelocM == Reloc::PIC_) {
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PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
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((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
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? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
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LSDAEncoding = dwarf::DW_EH_PE_pcrel |
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(CMModel == CodeModel::Small
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? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
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TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
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((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
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? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
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} else {
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PersonalityEncoding =
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(CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
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? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
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LSDAEncoding = (CMModel == CodeModel::Small)
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? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
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TTypeEncoding = (CMModel == CodeModel::Small)
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? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
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}
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break;
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case Triple::aarch64:
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case Triple::aarch64_be:
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// The small model guarantees static code/data size < 4GB, but not where it
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// will be in memory. Most of these could end up >2GB away so even a signed
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// pc-relative 32-bit address is insufficient, theoretically.
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if (RelocM == Reloc::PIC_) {
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PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
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dwarf::DW_EH_PE_sdata8;
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LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
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TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
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dwarf::DW_EH_PE_sdata8;
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} else {
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PersonalityEncoding = dwarf::DW_EH_PE_absptr;
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LSDAEncoding = dwarf::DW_EH_PE_absptr;
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TTypeEncoding = dwarf::DW_EH_PE_absptr;
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}
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break;
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case Triple::mips:
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case Triple::mipsel:
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case Triple::mips64:
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case Triple::mips64el:
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// MIPS uses indirect pointer to refer personality functions, so that the
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// eh_frame section can be read-only. DW.ref.personality will be generated
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// for relocation.
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PersonalityEncoding = dwarf::DW_EH_PE_indirect;
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break;
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case Triple::ppc64:
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case Triple::ppc64le:
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PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
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dwarf::DW_EH_PE_udata8;
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LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
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TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
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dwarf::DW_EH_PE_udata8;
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break;
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case Triple::sparc:
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if (RelocM == Reloc::PIC_) {
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LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
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PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
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dwarf::DW_EH_PE_sdata4;
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TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
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dwarf::DW_EH_PE_sdata4;
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} else {
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LSDAEncoding = dwarf::DW_EH_PE_absptr;
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PersonalityEncoding = dwarf::DW_EH_PE_absptr;
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TTypeEncoding = dwarf::DW_EH_PE_absptr;
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}
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break;
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case Triple::sparcv9:
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LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
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if (RelocM == Reloc::PIC_) {
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PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
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dwarf::DW_EH_PE_sdata4;
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TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
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dwarf::DW_EH_PE_sdata4;
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} else {
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PersonalityEncoding = dwarf::DW_EH_PE_absptr;
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TTypeEncoding = dwarf::DW_EH_PE_absptr;
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}
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break;
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case Triple::systemz:
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// All currently-defined code models guarantee that 4-byte PC-relative
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// values will be in range.
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if (RelocM == Reloc::PIC_) {
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PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
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dwarf::DW_EH_PE_sdata4;
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LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
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TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
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dwarf::DW_EH_PE_sdata4;
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} else {
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PersonalityEncoding = dwarf::DW_EH_PE_absptr;
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LSDAEncoding = dwarf::DW_EH_PE_absptr;
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TTypeEncoding = dwarf::DW_EH_PE_absptr;
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}
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break;
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default:
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break;
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}
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// Solaris requires different flags for .eh_frame to seemingly every other
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// platform.
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EHSectionType = ELF::SHT_PROGBITS;
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EHSectionFlags = ELF::SHF_ALLOC;
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if (T.isOSSolaris()) {
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if (T.getArch() == Triple::x86_64)
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EHSectionType = ELF::SHT_X86_64_UNWIND;
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else
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EHSectionFlags |= ELF::SHF_WRITE;
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}
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// ELF
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BSSSection =
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Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
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ELF::SHF_WRITE | ELF::SHF_ALLOC,
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SectionKind::getBSS());
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TextSection =
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Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
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ELF::SHF_EXECINSTR |
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ELF::SHF_ALLOC,
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SectionKind::getText());
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DataSection =
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Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
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ELF::SHF_WRITE |ELF::SHF_ALLOC,
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SectionKind::getDataRel());
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ReadOnlySection =
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Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS,
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ELF::SHF_ALLOC,
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SectionKind::getReadOnly());
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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());
|
|
|
|
COFFDebugSymbolsSection = nullptr;
|
|
|
|
// 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());
|
|
DwarfGnuPubNamesSection =
|
|
Ctx->getELFSection(".debug_gnu_pubnames", ELF::SHT_PROGBITS, 0,
|
|
SectionKind::getMetadata());
|
|
DwarfGnuPubTypesSection =
|
|
Ctx->getELFSection(".debug_gnu_pubtypes", ELF::SHT_PROGBITS, 0,
|
|
SectionKind::getMetadata());
|
|
DwarfStrSection =
|
|
Ctx->getELFSection(".debug_str", ELF::SHT_PROGBITS,
|
|
ELF::SHF_MERGE | ELF::SHF_STRINGS,
|
|
SectionKind::getMergeable1ByteCString());
|
|
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());
|
|
|
|
// DWARF5 Experimental Debug Info
|
|
|
|
// Accelerator Tables
|
|
DwarfAccelNamesSection =
|
|
Ctx->getELFSection(".apple_names", ELF::SHT_PROGBITS, 0,
|
|
SectionKind::getMetadata());
|
|
DwarfAccelObjCSection =
|
|
Ctx->getELFSection(".apple_objc", ELF::SHT_PROGBITS, 0,
|
|
SectionKind::getMetadata());
|
|
DwarfAccelNamespaceSection =
|
|
Ctx->getELFSection(".apple_namespaces", ELF::SHT_PROGBITS, 0,
|
|
SectionKind::getMetadata());
|
|
DwarfAccelTypesSection =
|
|
Ctx->getELFSection(".apple_types", ELF::SHT_PROGBITS, 0,
|
|
SectionKind::getMetadata());
|
|
|
|
// Fission Sections
|
|
DwarfInfoDWOSection =
|
|
Ctx->getELFSection(".debug_info.dwo", ELF::SHT_PROGBITS, 0,
|
|
SectionKind::getMetadata());
|
|
DwarfTypesDWOSection =
|
|
Ctx->getELFSection(".debug_types.dwo", ELF::SHT_PROGBITS, 0,
|
|
SectionKind::getMetadata());
|
|
DwarfAbbrevDWOSection =
|
|
Ctx->getELFSection(".debug_abbrev.dwo", ELF::SHT_PROGBITS, 0,
|
|
SectionKind::getMetadata());
|
|
DwarfStrDWOSection =
|
|
Ctx->getELFSection(".debug_str.dwo", ELF::SHT_PROGBITS,
|
|
ELF::SHF_MERGE | ELF::SHF_STRINGS,
|
|
SectionKind::getMergeable1ByteCString());
|
|
DwarfLineDWOSection =
|
|
Ctx->getELFSection(".debug_line.dwo", ELF::SHT_PROGBITS, 0,
|
|
SectionKind::getMetadata());
|
|
DwarfLocDWOSection =
|
|
Ctx->getELFSection(".debug_loc.dwo", ELF::SHT_PROGBITS, 0,
|
|
SectionKind::getMetadata());
|
|
DwarfStrOffDWOSection =
|
|
Ctx->getELFSection(".debug_str_offsets.dwo", ELF::SHT_PROGBITS, 0,
|
|
SectionKind::getMetadata());
|
|
DwarfAddrSection =
|
|
Ctx->getELFSection(".debug_addr", ELF::SHT_PROGBITS, 0,
|
|
SectionKind::getMetadata());
|
|
|
|
StackMapSection =
|
|
Ctx->getELFSection(".llvm_stackmaps", ELF::SHT_PROGBITS,
|
|
ELF::SHF_ALLOC,
|
|
SectionKind::getMetadata());
|
|
|
|
}
|
|
|
|
|
|
void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) {
|
|
bool IsWoA = T.getArch() == Triple::arm || T.getArch() == Triple::thumb;
|
|
|
|
CommDirectiveSupportsAlignment = true;
|
|
|
|
// COFF
|
|
BSSSection =
|
|
Ctx->getCOFFSection(".bss",
|
|
COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ |
|
|
COFF::IMAGE_SCN_MEM_WRITE,
|
|
SectionKind::getBSS());
|
|
TextSection =
|
|
Ctx->getCOFFSection(".text",
|
|
(IsWoA ? COFF::IMAGE_SCN_MEM_16BIT
|
|
: (COFF::SectionCharacteristics)0) |
|
|
COFF::IMAGE_SCN_CNT_CODE |
|
|
COFF::IMAGE_SCN_MEM_EXECUTE |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getText());
|
|
DataSection =
|
|
Ctx->getCOFFSection(".data",
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ |
|
|
COFF::IMAGE_SCN_MEM_WRITE,
|
|
SectionKind::getDataRel());
|
|
ReadOnlySection =
|
|
Ctx->getCOFFSection(".rdata",
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getReadOnly());
|
|
|
|
if (T.isKnownWindowsMSVCEnvironment() || T.isWindowsItaniumEnvironment()) {
|
|
StaticCtorSection =
|
|
Ctx->getCOFFSection(".CRT$XCU",
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getReadOnly());
|
|
StaticDtorSection =
|
|
Ctx->getCOFFSection(".CRT$XTX",
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getReadOnly());
|
|
} else {
|
|
StaticCtorSection =
|
|
Ctx->getCOFFSection(".ctors",
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ |
|
|
COFF::IMAGE_SCN_MEM_WRITE,
|
|
SectionKind::getDataRel());
|
|
StaticDtorSection =
|
|
Ctx->getCOFFSection(".dtors",
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ |
|
|
COFF::IMAGE_SCN_MEM_WRITE,
|
|
SectionKind::getDataRel());
|
|
}
|
|
|
|
// FIXME: We're emitting LSDA info into a readonly section on COFF, even
|
|
// though it contains relocatable pointers. In PIC mode, this is probably a
|
|
// big runtime hit for C++ apps. Either the contents of the LSDA need to be
|
|
// adjusted or this should be a data section.
|
|
assert(T.isOSWindows() && "Windows is the only supported COFF target");
|
|
if (T.getArch() == Triple::x86_64) {
|
|
// On Windows 64 with SEH, the LSDA is emitted into the .xdata section
|
|
LSDASection = 0;
|
|
} else {
|
|
LSDASection = Ctx->getCOFFSection(".gcc_except_table",
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getReadOnly());
|
|
}
|
|
|
|
// Debug info.
|
|
COFFDebugSymbolsSection =
|
|
Ctx->getCOFFSection(".debug$S",
|
|
COFF::IMAGE_SCN_MEM_DISCARDABLE |
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getMetadata());
|
|
|
|
DwarfAbbrevSection =
|
|
Ctx->getCOFFSection(".debug_abbrev",
|
|
COFF::IMAGE_SCN_MEM_DISCARDABLE |
|
|
COFF::IMAGE_SCN_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());
|
|
DwarfGnuPubNamesSection =
|
|
Ctx->getCOFFSection(".debug_gnu_pubnames",
|
|
COFF::IMAGE_SCN_MEM_DISCARDABLE |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getMetadata());
|
|
DwarfGnuPubTypesSection =
|
|
Ctx->getCOFFSection(".debug_gnu_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());
|
|
DwarfInfoDWOSection =
|
|
Ctx->getCOFFSection(".debug_info.dwo",
|
|
COFF::IMAGE_SCN_MEM_DISCARDABLE |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getMetadata());
|
|
DwarfTypesDWOSection =
|
|
Ctx->getCOFFSection(".debug_types.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,
|
|
SectionKind::getMetadata());
|
|
DwarfStrDWOSection =
|
|
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,
|
|
SectionKind::getMetadata());
|
|
DwarfLocDWOSection =
|
|
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,
|
|
SectionKind::getMetadata());
|
|
|
|
DwarfAddrSection =
|
|
Ctx->getCOFFSection(".debug_addr",
|
|
COFF::IMAGE_SCN_MEM_DISCARDABLE |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getMetadata());
|
|
|
|
DwarfAccelNamesSection =
|
|
Ctx->getCOFFSection(".apple_names",
|
|
COFF::IMAGE_SCN_MEM_DISCARDABLE |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getMetadata());
|
|
DwarfAccelNamespaceSection =
|
|
Ctx->getCOFFSection(".apple_namespaces",
|
|
COFF::IMAGE_SCN_MEM_DISCARDABLE |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getMetadata());
|
|
DwarfAccelTypesSection =
|
|
Ctx->getCOFFSection(".apple_types",
|
|
COFF::IMAGE_SCN_MEM_DISCARDABLE |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getMetadata());
|
|
DwarfAccelObjCSection =
|
|
Ctx->getCOFFSection(".apple_objc",
|
|
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,
|
|
SectionKind::getMetadata());
|
|
|
|
PDataSection =
|
|
Ctx->getCOFFSection(".pdata",
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getDataRel());
|
|
|
|
XDataSection =
|
|
Ctx->getCOFFSection(".xdata",
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ,
|
|
SectionKind::getDataRel());
|
|
|
|
TLSDataSection =
|
|
Ctx->getCOFFSection(".tls$",
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ |
|
|
COFF::IMAGE_SCN_MEM_WRITE,
|
|
SectionKind::getDataRel());
|
|
}
|
|
|
|
void MCObjectFileInfo::InitMCObjectFileInfo(StringRef T, Reloc::Model relocm,
|
|
CodeModel::Model cm,
|
|
MCContext &ctx) {
|
|
RelocM = relocm;
|
|
CMModel = cm;
|
|
Ctx = &ctx;
|
|
|
|
// Common.
|
|
CommDirectiveSupportsAlignment = true;
|
|
SupportsWeakOmittedEHFrame = true;
|
|
SupportsCompactUnwindWithoutEHFrame = false;
|
|
|
|
PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding =
|
|
dwarf::DW_EH_PE_absptr;
|
|
|
|
CompactUnwindDwarfEHFrameOnly = 0;
|
|
|
|
EHFrameSection = nullptr; // Created on demand.
|
|
CompactUnwindSection = nullptr; // Used only by selected targets.
|
|
DwarfAccelNamesSection = nullptr; // Used only by selected targets.
|
|
DwarfAccelObjCSection = nullptr; // Used only by selected targets.
|
|
DwarfAccelNamespaceSection = nullptr; // Used only by selected targets.
|
|
DwarfAccelTypesSection = nullptr; // Used only by selected targets.
|
|
|
|
TT = 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 ||
|
|
Arch == Triple::arm || Arch == Triple::thumb ||
|
|
Arch == Triple::aarch64 ||
|
|
Arch == Triple::ppc || Arch == Triple::ppc64 ||
|
|
Arch == Triple::UnknownArch) &&
|
|
(TT.isOSDarwin() || TT.isOSBinFormatMachO())) {
|
|
Env = IsMachO;
|
|
InitMachOMCObjectFileInfo(TT);
|
|
} else if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
|
|
Arch == Triple::arm || Arch == Triple::thumb) &&
|
|
(TT.isOSWindows() && TT.getObjectFormat() == Triple::COFF)) {
|
|
Env = IsCOFF;
|
|
InitCOFFMCObjectFileInfo(TT);
|
|
} else {
|
|
Env = IsELF;
|
|
InitELFMCObjectFileInfo(TT);
|
|
}
|
|
}
|
|
|
|
const MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
|
|
return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
|
|
SectionKind::getMetadata(), 0, utostr(Hash));
|
|
}
|
|
|
|
void MCObjectFileInfo::InitEHFrameSection() {
|
|
if (Env == IsMachO)
|
|
EHFrameSection =
|
|
Ctx->getMachOSection("__TEXT", "__eh_frame",
|
|
MachO::S_COALESCED |
|
|
MachO::S_ATTR_NO_TOC |
|
|
MachO::S_ATTR_STRIP_STATIC_SYMS |
|
|
MachO::S_ATTR_LIVE_SUPPORT,
|
|
SectionKind::getReadOnly());
|
|
else if (Env == IsELF)
|
|
EHFrameSection =
|
|
Ctx->getELFSection(".eh_frame", EHSectionType,
|
|
EHSectionFlags,
|
|
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());
|
|
}
|