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llvm-project/llvm/lib/MC/MCObjectFileInfo.cpp
YunQiang Su 8f21294897
MIPS: Use pcrel|sdata4 for eh_frame (#91291) 
Gas uses encoding DW_EH_PE_absptr for PIC, and gnu ld converts it to
DW_EH_PE_sdata4|DW_EH_PE_pcrel.
LLD doesn't have this workarounding, thus complains
```
  relocation R_MIPS_32 cannot be used against local symbol; recompile with -fPIC
  relocation R_MIPS_64 cannot be used against local symbol; recompile with -fPIC
```

So, let's generates asm/obj files with `DW_EH_PE_sdata4|DW_EH_PE_pcrel`
encoding. In fact, GNU ld supports such OBJs well.

For N64, maybe we should use sdata8, while GNU ld doesn't support it
well, and in fact sdata4 is enough now. So we just ignore the `Large`
for `MCObjectFileInfo::initELFMCObjectFileInfo`. Maybe we should switch
back to sdata8 once GNU LD supports it well.

Fixes: #58377.
2024-05-08 17:30:14 +08:00

1262 lines
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//===-- 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/BinaryFormat/COFF.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/BinaryFormat/Wasm.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSectionCOFF.h"
#include "llvm/MC/MCSectionDXContainer.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCSectionGOFF.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCSectionSPIRV.h"
#include "llvm/MC/MCSectionWasm.h"
#include "llvm/MC/MCSectionXCOFF.h"
#include "llvm/Support/Casting.h"
#include "llvm/TargetParser/Triple.h"
using namespace llvm;
static bool useCompactUnwind(const Triple &T) {
// Only on darwin.
if (!T.isOSDarwin())
return false;
// aarch64 always has it.
if (T.getArch() == Triple::aarch64 || T.getArch() == Triple::aarch64_32)
return true;
// armv7k always has it.
if (T.isWatchABI())
return true;
// Use it on newer version of OS X.
if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6))
return true;
// And the iOS simulator.
if (T.isiOS() && T.isX86())
return true;
// The rest of the simulators always have it.
if (T.isSimulatorEnvironment())
return true;
// XROS always has it.
if (T.isXROS())
return true;
return false;
}
void MCObjectFileInfo::initMachOMCObjectFileInfo(const Triple &T) {
// MachO
SupportsWeakOmittedEHFrame = false;
EHFrameSection = Ctx->getMachOSection(
"__TEXT", "__eh_frame",
MachO::S_COALESCED | MachO::S_ATTR_NO_TOC |
MachO::S_ATTR_STRIP_STATIC_SYMS | MachO::S_ATTR_LIVE_SUPPORT,
SectionKind::getReadOnly());
if (T.isOSDarwin() &&
(T.getArch() == Triple::aarch64 || T.getArch() == Triple::aarch64_32 ||
T.isSimulatorEnvironment()))
SupportsCompactUnwindWithoutEHFrame = true;
switch (Ctx->emitDwarfUnwindInfo()) {
case EmitDwarfUnwindType::Always:
OmitDwarfIfHaveCompactUnwind = false;
break;
case EmitDwarfUnwindType::NoCompactUnwind:
OmitDwarfIfHaveCompactUnwind = true;
break;
case EmitDwarfUnwindType::Default:
OmitDwarfIfHaveCompactUnwind =
T.isWatchABI() || SupportsCompactUnwindWithoutEHFrame;
break;
}
FDECFIEncoding = dwarf::DW_EH_PE_pcrel;
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());
AddrSigSection = Ctx->getMachOSection("__DATA", "__llvm_addrsig", 0,
SectionKind::getData());
// 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.isX86())
CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_X86_64_MODE_DWARF
else if (T.getArch() == Triple::aarch64 || T.getArch() == Triple::aarch64_32)
CompactUnwindDwarfEHFrameOnly = 0x03000000; // UNWIND_ARM64_MODE_DWARF
else if (T.getArch() == Triple::arm || T.getArch() == Triple::thumb)
CompactUnwindDwarfEHFrameOnly = 0x04000000; // UNWIND_ARM_MODE_DWARF
}
// Debug Information.
DwarfDebugNamesSection =
Ctx->getMachOSection("__DWARF", "__debug_names", MachO::S_ATTR_DEBUG,
SectionKind::getMetadata(), "debug_names_begin");
DwarfAccelNamesSection =
Ctx->getMachOSection("__DWARF", "__apple_names", MachO::S_ATTR_DEBUG,
SectionKind::getMetadata(), "names_begin");
DwarfAccelObjCSection =
Ctx->getMachOSection("__DWARF", "__apple_objc", MachO::S_ATTR_DEBUG,
SectionKind::getMetadata(), "objc_begin");
// 16 character section limit...
DwarfAccelNamespaceSection =
Ctx->getMachOSection("__DWARF", "__apple_namespac", MachO::S_ATTR_DEBUG,
SectionKind::getMetadata(), "namespac_begin");
DwarfAccelTypesSection =
Ctx->getMachOSection("__DWARF", "__apple_types", MachO::S_ATTR_DEBUG,
SectionKind::getMetadata(), "types_begin");
DwarfSwiftASTSection =
Ctx->getMachOSection("__DWARF", "__swift_ast", MachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
DwarfAbbrevSection =
Ctx->getMachOSection("__DWARF", "__debug_abbrev", MachO::S_ATTR_DEBUG,
SectionKind::getMetadata(), "section_abbrev");
DwarfInfoSection =
Ctx->getMachOSection("__DWARF", "__debug_info", MachO::S_ATTR_DEBUG,
SectionKind::getMetadata(), "section_info");
DwarfLineSection =
Ctx->getMachOSection("__DWARF", "__debug_line", MachO::S_ATTR_DEBUG,
SectionKind::getMetadata(), "section_line");
DwarfLineStrSection =
Ctx->getMachOSection("__DWARF", "__debug_line_str", MachO::S_ATTR_DEBUG,
SectionKind::getMetadata(), "section_line_str");
DwarfFrameSection =
Ctx->getMachOSection("__DWARF", "__debug_frame", MachO::S_ATTR_DEBUG,
SectionKind::getMetadata(), "section_frame");
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");
DwarfMacroSection =
Ctx->getMachOSection("__DWARF", "__debug_macro", MachO::S_ATTR_DEBUG,
SectionKind::getMetadata(), "debug_macro");
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());
// The architecture of dsymutil makes it very difficult to copy the Swift
// reflection metadata sections into the __TEXT segment, so dsymutil creates
// these sections in the __DWARF segment instead.
if (!Ctx->getSwift5ReflectionSegmentName().empty()) {
#define HANDLE_SWIFT_SECTION(KIND, MACHO, ELF, COFF) \
Swift5ReflectionSections \
[llvm::binaryformat::Swift5ReflectionSectionKind::KIND] = \
Ctx->getMachOSection(Ctx->getSwift5ReflectionSegmentName().data(), \
MACHO, 0, SectionKind::getMetadata());
#include "llvm/BinaryFormat/Swift.def"
}
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:
// We cannot use DW_EH_PE_sdata8 for the large PositionIndependent case
// since there is no R_MIPS_PC64 relocation (only a 32-bit version).
// In fact DW_EH_PE_sdata4 is enough for us now, and GNU ld doesn't
// support pcrel|sdata8 well. Let's use sdata4 for now.
if (PositionIndependent)
FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
else
FDECFIEncoding = Ctx->getAsmInfo()->getCodePointerSize() == 4
? dwarf::DW_EH_PE_sdata4
: dwarf::DW_EH_PE_sdata8;
break;
case Triple::ppc64:
case Triple::ppc64le:
case Triple::aarch64:
case Triple::aarch64_be:
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;
case Triple::xtensa:
FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
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);
DwarfMacroSection = Ctx->getELFSection(".debug_macro", 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);
DwarfMacinfoDWOSection =
Ctx->getELFSection(".debug_macinfo.dwo", DebugSecType, ELF::SHF_EXCLUDE);
DwarfMacroDWOSection =
Ctx->getELFSection(".debug_macro.dwo", DebugSecType, ELF::SHF_EXCLUDE);
DwarfLoclistsDWOSection =
Ctx->getELFSection(".debug_loclists.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);
PseudoProbeSection = Ctx->getELFSection(".pseudo_probe", DebugSecType, 0);
PseudoProbeDescSection =
Ctx->getELFSection(".pseudo_probe_desc", DebugSecType, 0);
LLVMStatsSection = Ctx->getELFSection(".llvm_stats", ELF::SHT_PROGBITS, 0);
}
void MCObjectFileInfo::initGOFFMCObjectFileInfo(const Triple &T) {
TextSection =
Ctx->getGOFFSection(".text", SectionKind::getText(), nullptr, nullptr);
BSSSection =
Ctx->getGOFFSection(".bss", SectionKind::getBSS(), nullptr, nullptr);
PPA1Section =
Ctx->getGOFFSection(".ppa1", SectionKind::getMetadata(), TextSection,
MCConstantExpr::create(GOFF::SK_PPA1, *Ctx));
PPA2Section =
Ctx->getGOFFSection(".ppa2", SectionKind::getMetadata(), TextSection,
MCConstantExpr::create(GOFF::SK_PPA2, *Ctx));
PPA2ListSection =
Ctx->getGOFFSection(".ppa2list", SectionKind::getData(),
nullptr, nullptr);
ADASection =
Ctx->getGOFFSection(".ada", SectionKind::getData(), nullptr, nullptr);
IDRLSection =
Ctx->getGOFFSection("B_IDRL", SectionKind::getData(), nullptr, nullptr);
}
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;
// 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 ||
T.getArch() == Triple::arm || T.getArch() == Triple::thumb) {
// On Windows 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");
DwarfLoclistsSection = Ctx->getCOFFSection(
".debug_loclists",
COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ,
SectionKind::getMetadata(), "section_debug_loclists");
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");
DwarfRnglistsSection = Ctx->getCOFFSection(
".debug_rnglists",
COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ,
SectionKind::getMetadata(), "debug_rnglists");
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");
DwarfMacroSection = Ctx->getCOFFSection(
".debug_macro",
COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ,
SectionKind::getMetadata(), "debug_macro");
DwarfMacinfoDWOSection = Ctx->getCOFFSection(
".debug_macinfo.dwo",
COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ,
SectionKind::getMetadata(), "debug_macinfo.dwo");
DwarfMacroDWOSection = Ctx->getCOFFSection(
".debug_macro.dwo",
COFF::IMAGE_SCN_MEM_DISCARDABLE | COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ,
SectionKind::getMetadata(), "debug_macro.dwo");
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());
GEHContSection = Ctx->getCOFFSection(".gehcont$y",
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ,
SectionKind::getMetadata());
GFIDsSection = Ctx->getCOFFSection(".gfids$y",
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ,
SectionKind::getMetadata());
GIATsSection = Ctx->getCOFFSection(".giats$y",
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ,
SectionKind::getMetadata());
GLJMPSection = Ctx->getCOFFSection(".gljmp$y",
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ,
SectionKind::getMetadata());
TLSDataSection = Ctx->getCOFFSection(
".tls$", 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::initSPIRVMCObjectFileInfo(const Triple &T) {
// Put everything in a single binary section.
TextSection = Ctx->getSPIRVSection();
}
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(),
wasm::WASM_SEG_FLAG_STRINGS);
DwarfStrSection = Ctx->getWasmSection(
".debug_str", SectionKind::getMetadata(), wasm::WASM_SEG_FLAG_STRINGS);
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());
DwarfMacroSection =
Ctx->getWasmSection(".debug_macro", 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());
DwarfGnuPubNamesSection =
Ctx->getWasmSection(".debug_gnu_pubnames", SectionKind::getMetadata());
DwarfGnuPubTypesSection =
Ctx->getWasmSection(".debug_gnu_pubtypes", SectionKind::getMetadata());
DwarfDebugNamesSection =
Ctx->getWasmSection(".debug_names", SectionKind::getMetadata());
DwarfStrOffSection =
Ctx->getWasmSection(".debug_str_offsets", SectionKind::getMetadata());
DwarfAddrSection =
Ctx->getWasmSection(".debug_addr", SectionKind::getMetadata());
DwarfRnglistsSection =
Ctx->getWasmSection(".debug_rnglists", SectionKind::getMetadata());
DwarfLoclistsSection =
Ctx->getWasmSection(".debug_loclists", SectionKind::getMetadata());
// Fission Sections
DwarfInfoDWOSection =
Ctx->getWasmSection(".debug_info.dwo", SectionKind::getMetadata());
DwarfTypesDWOSection =
Ctx->getWasmSection(".debug_types.dwo", SectionKind::getMetadata());
DwarfAbbrevDWOSection =
Ctx->getWasmSection(".debug_abbrev.dwo", SectionKind::getMetadata());
DwarfStrDWOSection =
Ctx->getWasmSection(".debug_str.dwo", SectionKind::getMetadata(),
wasm::WASM_SEG_FLAG_STRINGS);
DwarfLineDWOSection =
Ctx->getWasmSection(".debug_line.dwo", SectionKind::getMetadata());
DwarfLocDWOSection =
Ctx->getWasmSection(".debug_loc.dwo", SectionKind::getMetadata());
DwarfStrOffDWOSection =
Ctx->getWasmSection(".debug_str_offsets.dwo", SectionKind::getMetadata());
DwarfRnglistsDWOSection =
Ctx->getWasmSection(".debug_rnglists.dwo", SectionKind::getMetadata());
DwarfMacinfoDWOSection =
Ctx->getWasmSection(".debug_macinfo.dwo", SectionKind::getMetadata());
DwarfMacroDWOSection =
Ctx->getWasmSection(".debug_macro.dwo", SectionKind::getMetadata());
DwarfLoclistsDWOSection =
Ctx->getWasmSection(".debug_loclists.dwo", SectionKind::getMetadata());
// DWP Sections
DwarfCUIndexSection =
Ctx->getWasmSection(".debug_cu_index", SectionKind::getMetadata());
DwarfTUIndexSection =
Ctx->getWasmSection(".debug_tu_index", 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, but various tools rely on the section
// name being empty (considering named symbols to be "user symbol names").
TextSection = Ctx->getXCOFFSection(
"..text..", // Use a non-null name to work around an AIX assembler bug...
SectionKind::getText(),
XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_PR, XCOFF::XTY_SD),
/* MultiSymbolsAllowed*/ true);
// ... but use a null name when generating the symbol table.
MCSectionXCOFF *TS = static_cast<MCSectionXCOFF *>(TextSection);
TS->getQualNameSymbol()->setSymbolTableName("");
TS->setSymbolTableName("");
DataSection = Ctx->getXCOFFSection(
".data", SectionKind::getData(),
XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RW, XCOFF::XTY_SD),
/* MultiSymbolsAllowed*/ true);
ReadOnlySection = Ctx->getXCOFFSection(
".rodata", SectionKind::getReadOnly(),
XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RO, XCOFF::XTY_SD),
/* MultiSymbolsAllowed*/ true);
ReadOnlySection->setAlignment(Align(4));
ReadOnly8Section = Ctx->getXCOFFSection(
".rodata.8", SectionKind::getReadOnly(),
XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RO, XCOFF::XTY_SD),
/* MultiSymbolsAllowed*/ true);
ReadOnly8Section->setAlignment(Align(8));
ReadOnly16Section = Ctx->getXCOFFSection(
".rodata.16", SectionKind::getReadOnly(),
XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RO, XCOFF::XTY_SD),
/* MultiSymbolsAllowed*/ true);
ReadOnly16Section->setAlignment(Align(16));
TLSDataSection = Ctx->getXCOFFSection(
".tdata", SectionKind::getThreadData(),
XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_TL, XCOFF::XTY_SD),
/* MultiSymbolsAllowed*/ true);
TOCBaseSection = Ctx->getXCOFFSection(
"TOC", SectionKind::getData(),
XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_TC0,
XCOFF::XTY_SD));
// The TOC-base always has 0 size, but 4 byte alignment.
TOCBaseSection->setAlignment(Align(4));
LSDASection = Ctx->getXCOFFSection(
".gcc_except_table", SectionKind::getReadOnly(),
XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RO,
XCOFF::XTY_SD));
CompactUnwindSection = Ctx->getXCOFFSection(
".eh_info_table", SectionKind::getData(),
XCOFF::CsectProperties(XCOFF::StorageMappingClass::XMC_RW,
XCOFF::XTY_SD));
// DWARF sections for XCOFF are not csects. They are special STYP_DWARF
// sections, and the individual DWARF sections are distinguished by their
// section subtype.
DwarfAbbrevSection = Ctx->getXCOFFSection(
".dwabrev", SectionKind::getMetadata(),
/* CsectProperties */ std::nullopt,
/* MultiSymbolsAllowed */ true, ".dwabrev", XCOFF::SSUBTYP_DWABREV);
DwarfInfoSection = Ctx->getXCOFFSection(
".dwinfo", SectionKind::getMetadata(), /* CsectProperties */ std::nullopt,
/* MultiSymbolsAllowed */ true, ".dwinfo", XCOFF::SSUBTYP_DWINFO);
DwarfLineSection = Ctx->getXCOFFSection(
".dwline", SectionKind::getMetadata(), /* CsectProperties */ std::nullopt,
/* MultiSymbolsAllowed */ true, ".dwline", XCOFF::SSUBTYP_DWLINE);
DwarfFrameSection = Ctx->getXCOFFSection(
".dwframe", SectionKind::getMetadata(),
/* CsectProperties */ std::nullopt,
/* MultiSymbolsAllowed */ true, ".dwframe", XCOFF::SSUBTYP_DWFRAME);
DwarfPubNamesSection = Ctx->getXCOFFSection(
".dwpbnms", SectionKind::getMetadata(),
/* CsectProperties */ std::nullopt,
/* MultiSymbolsAllowed */ true, ".dwpbnms", XCOFF::SSUBTYP_DWPBNMS);
DwarfPubTypesSection = Ctx->getXCOFFSection(
".dwpbtyp", SectionKind::getMetadata(),
/* CsectProperties */ std::nullopt,
/* MultiSymbolsAllowed */ true, ".dwpbtyp", XCOFF::SSUBTYP_DWPBTYP);
DwarfStrSection = Ctx->getXCOFFSection(
".dwstr", SectionKind::getMetadata(), /* CsectProperties */ std::nullopt,
/* MultiSymbolsAllowed */ true, ".dwstr", XCOFF::SSUBTYP_DWSTR);
DwarfLocSection = Ctx->getXCOFFSection(
".dwloc", SectionKind::getMetadata(), /* CsectProperties */ std::nullopt,
/* MultiSymbolsAllowed */ true, ".dwloc", XCOFF::SSUBTYP_DWLOC);
DwarfARangesSection = Ctx->getXCOFFSection(
".dwarnge", SectionKind::getMetadata(),
/* CsectProperties */ std::nullopt,
/* MultiSymbolsAllowed */ true, ".dwarnge", XCOFF::SSUBTYP_DWARNGE);
DwarfRangesSection = Ctx->getXCOFFSection(
".dwrnges", SectionKind::getMetadata(),
/* CsectProperties */ std::nullopt,
/* MultiSymbolsAllowed */ true, ".dwrnges", XCOFF::SSUBTYP_DWRNGES);
DwarfMacinfoSection = Ctx->getXCOFFSection(
".dwmac", SectionKind::getMetadata(), /* CsectProperties */ std::nullopt,
/* MultiSymbolsAllowed */ true, ".dwmac", XCOFF::SSUBTYP_DWMAC);
}
void MCObjectFileInfo::initDXContainerObjectFileInfo(const Triple &T) {
// At the moment the DXBC section should end up empty.
TextSection = Ctx->getDXContainerSection("DXBC", SectionKind::getText());
}
MCObjectFileInfo::~MCObjectFileInfo() = default;
void MCObjectFileInfo::initMCObjectFileInfo(MCContext &MCCtx, bool PIC,
bool LargeCodeModel) {
PositionIndependent = PIC;
Ctx = &MCCtx;
// Common.
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.
Triple TheTriple = Ctx->getTargetTriple();
switch (Ctx->getObjectFileType()) {
case MCContext::IsMachO:
initMachOMCObjectFileInfo(TheTriple);
break;
case MCContext::IsCOFF:
initCOFFMCObjectFileInfo(TheTriple);
break;
case MCContext::IsELF:
initELFMCObjectFileInfo(TheTriple, LargeCodeModel);
break;
case MCContext::IsGOFF:
initGOFFMCObjectFileInfo(TheTriple);
break;
case MCContext::IsSPIRV:
initSPIRVMCObjectFileInfo(TheTriple);
break;
case MCContext::IsWasm:
initWasmMCObjectFileInfo(TheTriple);
break;
case MCContext::IsXCOFF:
initXCOFFMCObjectFileInfo(TheTriple);
break;
case MCContext::IsDXContainer:
initDXContainerObjectFileInfo(TheTriple);
break;
}
}
MCSection *MCObjectFileInfo::getDwarfComdatSection(const char *Name,
uint64_t Hash) const {
switch (Ctx->getTargetTriple().getObjectFormat()) {
case Triple::ELF:
return Ctx->getELFSection(Name, ELF::SHT_PROGBITS, ELF::SHF_GROUP, 0,
utostr(Hash), /*IsComdat=*/true);
case Triple::Wasm:
return Ctx->getWasmSection(Name, SectionKind::getMetadata(), 0,
utostr(Hash), MCContext::GenericSectionID);
case Triple::MachO:
case Triple::COFF:
case Triple::GOFF:
case Triple::SPIRV:
case Triple::XCOFF:
case Triple::DXContainer:
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 ((Ctx->getObjectFileType() != MCContext::IsELF) ||
Ctx->getTargetTriple().isPS4())
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;
}
return Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, Flags, 0,
GroupName, true, ElfSec.getUniqueID(),
cast<MCSymbolELF>(TextSec.getBeginSymbol()));
}
MCSection *
MCObjectFileInfo::getBBAddrMapSection(const MCSection &TextSec) const {
if (Ctx->getObjectFileType() != MCContext::IsELF)
return nullptr;
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;
}
// Use the text section's begin symbol and unique ID to create a separate
// .llvm_bb_addr_map section associated with every unique text section.
return Ctx->getELFSection(".llvm_bb_addr_map", ELF::SHT_LLVM_BB_ADDR_MAP,
Flags, 0, GroupName, true, ElfSec.getUniqueID(),
cast<MCSymbolELF>(TextSec.getBeginSymbol()));
}
MCSection *
MCObjectFileInfo::getKCFITrapSection(const MCSection &TextSec) const {
if (Ctx->getObjectFileType() != MCContext::IsELF)
return nullptr;
const MCSectionELF &ElfSec = static_cast<const MCSectionELF &>(TextSec);
unsigned Flags = ELF::SHF_LINK_ORDER | ELF::SHF_ALLOC;
StringRef GroupName;
if (const MCSymbol *Group = ElfSec.getGroup()) {
GroupName = Group->getName();
Flags |= ELF::SHF_GROUP;
}
return Ctx->getELFSection(".kcfi_traps", ELF::SHT_PROGBITS, Flags, 0,
GroupName,
/*IsComdat=*/true, ElfSec.getUniqueID(),
cast<MCSymbolELF>(TextSec.getBeginSymbol()));
}
MCSection *
MCObjectFileInfo::getPseudoProbeSection(const MCSection &TextSec) const {
if (Ctx->getObjectFileType() != MCContext::IsELF)
return PseudoProbeSection;
const auto &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;
}
return Ctx->getELFSection(PseudoProbeSection->getName(), ELF::SHT_PROGBITS,
Flags, 0, GroupName, true, ElfSec.getUniqueID(),
cast<MCSymbolELF>(TextSec.getBeginSymbol()));
}
MCSection *
MCObjectFileInfo::getPseudoProbeDescSection(StringRef FuncName) const {
if (Ctx->getObjectFileType() == MCContext::IsELF) {
// Create a separate comdat group for each function's descriptor in order
// for the linker to deduplicate. The duplication, must be from different
// tranlation unit, can come from:
// 1. Inline functions defined in header files;
// 2. ThinLTO imported funcions;
// 3. Weak-linkage definitions.
// Use a concatenation of the section name and the function name as the
// group name so that descriptor-only groups won't be folded with groups of
// code.
if (Ctx->getTargetTriple().supportsCOMDAT() && !FuncName.empty()) {
auto *S = static_cast<MCSectionELF *>(PseudoProbeDescSection);
auto Flags = S->getFlags() | ELF::SHF_GROUP;
return Ctx->getELFSection(S->getName(), S->getType(), Flags,
S->getEntrySize(),
S->getName() + "_" + FuncName,
/*IsComdat=*/true);
}
}
return PseudoProbeDescSection;
}
MCSection *MCObjectFileInfo::getLLVMStatsSection() const {
return LLVMStatsSection;
}
MCSection *MCObjectFileInfo::getPCSection(StringRef Name,
const MCSection *TextSec) const {
if (Ctx->getObjectFileType() != MCContext::IsELF)
return nullptr;
// SHF_WRITE for relocations, and let user post-process data in-place.
unsigned Flags = ELF::SHF_WRITE | ELF::SHF_ALLOC | ELF::SHF_LINK_ORDER;
if (!TextSec)
TextSec = getTextSection();
StringRef GroupName;
const auto &ElfSec = static_cast<const MCSectionELF &>(*TextSec);
if (const MCSymbol *Group = ElfSec.getGroup()) {
GroupName = Group->getName();
Flags |= ELF::SHF_GROUP;
}
return Ctx->getELFSection(Name, ELF::SHT_PROGBITS, Flags, 0, GroupName, true,
ElfSec.getUniqueID(),
cast<MCSymbolELF>(TextSec->getBeginSymbol()));
}
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