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llvm-mirror/lib/MC/MCObjectFileInfo.cpp
David Blaikie 8a09ed5776 DebugInfo: Move type units into the debug_types section with appropriate comdat grouping and type unit headers 
This commit does not complete the type units feature - there are issues
around fission support (skeletal type units, pubtypes/pubnames) and
hashing of some types including those containing references to types in
other type units.

Originally committed as r197073 and reverted in r197079.
Recommitted as r197197 to reproduce the failure and reverted as r197199

Turns out there was unstable ordering in the type unit dumping code.
Fixed by using MapVector in DWARFContext to store the debug_types
comdat sections.

Recommitted as r197210 with a fix to dumping and reverted as r197211
because I was a bit gun shy and thought I saw a failure that turned out
to be unrelated.

So here we go - once more with feeling! \o/

llvm-svn: 197275
2013-12-13 21:33:40 +00:00

755 lines
31 KiB
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//===-- MObjectFileInfo.cpp - Object File Information ---------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/ADT/Triple.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSectionCOFF.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCSectionMachO.h"
using namespace llvm;
void MCObjectFileInfo::InitMachOMCObjectFileInfo(Triple T) {
// MachO
IsFunctionEHFrameSymbolPrivate = false;
SupportsWeakOmittedEHFrame = false;
PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel
| dwarf::DW_EH_PE_sdata4;
LSDAEncoding = FDEEncoding = FDECFIEncoding = dwarf::DW_EH_PE_pcrel;
TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
dwarf::DW_EH_PE_sdata4;
// .comm doesn't support alignment before Leopard.
if (T.isMacOSX() && T.isMacOSXVersionLT(10, 5))
CommDirectiveSupportsAlignment = false;
TextSection // .text
= Ctx->getMachOSection("__TEXT", "__text",
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
SectionKind::getText());
DataSection // .data
= Ctx->getMachOSection("__DATA", "__data", 0,
SectionKind::getDataRel());
// BSSSection might not be expected initialized on msvc.
BSSSection = 0;
TLSDataSection // .tdata
= Ctx->getMachOSection("__DATA", "__thread_data",
MCSectionMachO::S_THREAD_LOCAL_REGULAR,
SectionKind::getDataRel());
TLSBSSSection // .tbss
= Ctx->getMachOSection("__DATA", "__thread_bss",
MCSectionMachO::S_THREAD_LOCAL_ZEROFILL,
SectionKind::getThreadBSS());
// TODO: Verify datarel below.
TLSTLVSection // .tlv
= Ctx->getMachOSection("__DATA", "__thread_vars",
MCSectionMachO::S_THREAD_LOCAL_VARIABLES,
SectionKind::getDataRel());
TLSThreadInitSection
= Ctx->getMachOSection("__DATA", "__thread_init",
MCSectionMachO::S_THREAD_LOCAL_INIT_FUNCTION_POINTERS,
SectionKind::getDataRel());
CStringSection // .cstring
= Ctx->getMachOSection("__TEXT", "__cstring",
MCSectionMachO::S_CSTRING_LITERALS,
SectionKind::getMergeable1ByteCString());
UStringSection
= Ctx->getMachOSection("__TEXT","__ustring", 0,
SectionKind::getMergeable2ByteCString());
FourByteConstantSection // .literal4
= Ctx->getMachOSection("__TEXT", "__literal4",
MCSectionMachO::S_4BYTE_LITERALS,
SectionKind::getMergeableConst4());
EightByteConstantSection // .literal8
= Ctx->getMachOSection("__TEXT", "__literal8",
MCSectionMachO::S_8BYTE_LITERALS,
SectionKind::getMergeableConst8());
// ld_classic doesn't support .literal16 in 32-bit mode, and ld64 falls back
// to using it in -static mode.
SixteenByteConstantSection = 0;
if (RelocM != Reloc::Static &&
T.getArch() != Triple::x86_64 && T.getArch() != Triple::ppc64 &&
T.getArch() != Triple::ppc64le)
SixteenByteConstantSection = // .literal16
Ctx->getMachOSection("__TEXT", "__literal16",
MCSectionMachO::S_16BYTE_LITERALS,
SectionKind::getMergeableConst16());
ReadOnlySection // .const
= Ctx->getMachOSection("__TEXT", "__const", 0,
SectionKind::getReadOnly());
TextCoalSection
= Ctx->getMachOSection("__TEXT", "__textcoal_nt",
MCSectionMachO::S_COALESCED |
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
SectionKind::getText());
ConstTextCoalSection
= Ctx->getMachOSection("__TEXT", "__const_coal",
MCSectionMachO::S_COALESCED,
SectionKind::getReadOnly());
ConstDataSection // .const_data
= Ctx->getMachOSection("__DATA", "__const", 0,
SectionKind::getReadOnlyWithRel());
DataCoalSection
= Ctx->getMachOSection("__DATA","__datacoal_nt",
MCSectionMachO::S_COALESCED,
SectionKind::getDataRel());
DataCommonSection
= Ctx->getMachOSection("__DATA","__common",
MCSectionMachO::S_ZEROFILL,
SectionKind::getBSS());
DataBSSSection
= Ctx->getMachOSection("__DATA","__bss", MCSectionMachO::S_ZEROFILL,
SectionKind::getBSS());
LazySymbolPointerSection
= Ctx->getMachOSection("__DATA", "__la_symbol_ptr",
MCSectionMachO::S_LAZY_SYMBOL_POINTERS,
SectionKind::getMetadata());
NonLazySymbolPointerSection
= Ctx->getMachOSection("__DATA", "__nl_symbol_ptr",
MCSectionMachO::S_NON_LAZY_SYMBOL_POINTERS,
SectionKind::getMetadata());
if (RelocM == Reloc::Static) {
StaticCtorSection
= Ctx->getMachOSection("__TEXT", "__constructor", 0,
SectionKind::getDataRel());
StaticDtorSection
= Ctx->getMachOSection("__TEXT", "__destructor", 0,
SectionKind::getDataRel());
} else {
StaticCtorSection
= Ctx->getMachOSection("__DATA", "__mod_init_func",
MCSectionMachO::S_MOD_INIT_FUNC_POINTERS,
SectionKind::getDataRel());
StaticDtorSection
= Ctx->getMachOSection("__DATA", "__mod_term_func",
MCSectionMachO::S_MOD_TERM_FUNC_POINTERS,
SectionKind::getDataRel());
}
// Exception Handling.
LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0,
SectionKind::getReadOnlyWithRel());
if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6)) {
CompactUnwindSection =
Ctx->getMachOSection("__LD", "__compact_unwind",
MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getReadOnly());
if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)
CompactUnwindDwarfEHFrameOnly = 0x04000000;
}
// Debug Information.
DwarfAccelNamesSection =
Ctx->getMachOSection("__DWARF", "__apple_names",
MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
DwarfAccelObjCSection =
Ctx->getMachOSection("__DWARF", "__apple_objc",
MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
// 16 character section limit...
DwarfAccelNamespaceSection =
Ctx->getMachOSection("__DWARF", "__apple_namespac",
MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
DwarfAccelTypesSection =
Ctx->getMachOSection("__DWARF", "__apple_types",
MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
DwarfAbbrevSection =
Ctx->getMachOSection("__DWARF", "__debug_abbrev",
MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
DwarfInfoSection =
Ctx->getMachOSection("__DWARF", "__debug_info",
MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
DwarfLineSection =
Ctx->getMachOSection("__DWARF", "__debug_line",
MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
DwarfFrameSection =
Ctx->getMachOSection("__DWARF", "__debug_frame",
MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
DwarfPubNamesSection =
Ctx->getMachOSection("__DWARF", "__debug_pubnames",
MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
DwarfPubTypesSection =
Ctx->getMachOSection("__DWARF", "__debug_pubtypes",
MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
DwarfGnuPubNamesSection =
Ctx->getMachOSection("__DWARF", "__debug_gnu_pubn",
MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
DwarfGnuPubTypesSection =
Ctx->getMachOSection("__DWARF", "__debug_gnu_pubt",
MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
DwarfStrSection =
Ctx->getMachOSection("__DWARF", "__debug_str",
MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
DwarfLocSection =
Ctx->getMachOSection("__DWARF", "__debug_loc",
MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
DwarfARangesSection =
Ctx->getMachOSection("__DWARF", "__debug_aranges",
MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
DwarfRangesSection =
Ctx->getMachOSection("__DWARF", "__debug_ranges",
MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
DwarfMacroInfoSection =
Ctx->getMachOSection("__DWARF", "__debug_macinfo",
MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
DwarfDebugInlineSection =
Ctx->getMachOSection("__DWARF", "__debug_inlined",
MCSectionMachO::S_ATTR_DEBUG,
SectionKind::getMetadata());
StackMapSection =
Ctx->getMachOSection("__LLVM_STACKMAPS", "__llvm_stackmaps", 0,
SectionKind::getMetadata());
TLSExtraDataSection = TLSTLVSection;
}
void MCObjectFileInfo::InitELFMCObjectFileInfo(Triple T) {
if (T.getArch() == Triple::mips ||
T.getArch() == Triple::mipsel)
FDECFIEncoding = dwarf::DW_EH_PE_sdata4;
else if (T.getArch() == Triple::mips64 ||
T.getArch() == Triple::mips64el)
FDECFIEncoding = dwarf::DW_EH_PE_sdata8;
else
FDECFIEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
if (T.getArch() == Triple::x86) {
PersonalityEncoding = (RelocM == Reloc::PIC_)
? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
: dwarf::DW_EH_PE_absptr;
LSDAEncoding = (RelocM == Reloc::PIC_)
? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
: dwarf::DW_EH_PE_absptr;
FDEEncoding = (RelocM == Reloc::PIC_)
? dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
: dwarf::DW_EH_PE_absptr;
TTypeEncoding = (RelocM == Reloc::PIC_)
? dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
: dwarf::DW_EH_PE_absptr;
} else if (T.getArch() == Triple::x86_64) {
if (RelocM == Reloc::PIC_) {
PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
LSDAEncoding = dwarf::DW_EH_PE_pcrel |
(CMModel == CodeModel::Small
? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
((CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
? dwarf::DW_EH_PE_sdata4 : dwarf::DW_EH_PE_sdata8);
} else {
PersonalityEncoding =
(CMModel == CodeModel::Small || CMModel == CodeModel::Medium)
? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
LSDAEncoding = (CMModel == CodeModel::Small)
? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
FDEEncoding = dwarf::DW_EH_PE_udata4;
TTypeEncoding = (CMModel == CodeModel::Small)
? dwarf::DW_EH_PE_udata4 : dwarf::DW_EH_PE_absptr;
}
} else if (T.getArch() == Triple::aarch64) {
// The small model guarantees static code/data size < 4GB, but not where it
// will be in memory. Most of these could end up >2GB away so even a signed
// pc-relative 32-bit address is insufficient, theoretically.
if (RelocM == Reloc::PIC_) {
PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
dwarf::DW_EH_PE_sdata8;
LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8;
FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
dwarf::DW_EH_PE_sdata8;
} else {
PersonalityEncoding = dwarf::DW_EH_PE_absptr;
LSDAEncoding = dwarf::DW_EH_PE_absptr;
FDEEncoding = dwarf::DW_EH_PE_udata4;
TTypeEncoding = dwarf::DW_EH_PE_absptr;
}
} else if (T.getArch() == Triple::ppc64 || T.getArch() == Triple::ppc64le) {
PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
dwarf::DW_EH_PE_udata8;
LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8;
TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
dwarf::DW_EH_PE_udata8;
} else if (T.getArch() == Triple::systemz) {
// All currently-defined code models guarantee that 4-byte PC-relative
// values will be in range.
if (RelocM == Reloc::PIC_) {
PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
dwarf::DW_EH_PE_sdata4;
LSDAEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
FDEEncoding = dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4;
TTypeEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |
dwarf::DW_EH_PE_sdata4;
} else {
PersonalityEncoding = dwarf::DW_EH_PE_absptr;
LSDAEncoding = dwarf::DW_EH_PE_absptr;
FDEEncoding = dwarf::DW_EH_PE_absptr;
TTypeEncoding = dwarf::DW_EH_PE_absptr;
}
}
// Solaris requires different flags for .eh_frame to seemingly every other
// platform.
EHSectionType = ELF::SHT_PROGBITS;
EHSectionFlags = ELF::SHF_ALLOC;
if (T.getOS() == Triple::Solaris) {
if (T.getArch() == Triple::x86_64)
EHSectionType = ELF::SHT_X86_64_UNWIND;
else
EHSectionFlags |= ELF::SHF_WRITE;
}
// ELF
BSSSection =
Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
ELF::SHF_WRITE | ELF::SHF_ALLOC,
SectionKind::getBSS());
TextSection =
Ctx->getELFSection(".text", ELF::SHT_PROGBITS,
ELF::SHF_EXECINSTR |
ELF::SHF_ALLOC,
SectionKind::getText());
DataSection =
Ctx->getELFSection(".data", ELF::SHT_PROGBITS,
ELF::SHF_WRITE |ELF::SHF_ALLOC,
SectionKind::getDataRel());
ReadOnlySection =
Ctx->getELFSection(".rodata", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC,
SectionKind::getReadOnly());
TLSDataSection =
Ctx->getELFSection(".tdata", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC | ELF::SHF_TLS |
ELF::SHF_WRITE,
SectionKind::getThreadData());
TLSBSSSection =
Ctx->getELFSection(".tbss", ELF::SHT_NOBITS,
ELF::SHF_ALLOC | ELF::SHF_TLS |
ELF::SHF_WRITE,
SectionKind::getThreadBSS());
DataRelSection =
Ctx->getELFSection(".data.rel", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC |ELF::SHF_WRITE,
SectionKind::getDataRel());
DataRelLocalSection =
Ctx->getELFSection(".data.rel.local", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC |ELF::SHF_WRITE,
SectionKind::getDataRelLocal());
DataRelROSection =
Ctx->getELFSection(".data.rel.ro", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC |ELF::SHF_WRITE,
SectionKind::getReadOnlyWithRel());
DataRelROLocalSection =
Ctx->getELFSection(".data.rel.ro.local", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC |ELF::SHF_WRITE,
SectionKind::getReadOnlyWithRelLocal());
MergeableConst4Section =
Ctx->getELFSection(".rodata.cst4", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC |ELF::SHF_MERGE,
SectionKind::getMergeableConst4());
MergeableConst8Section =
Ctx->getELFSection(".rodata.cst8", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC |ELF::SHF_MERGE,
SectionKind::getMergeableConst8());
MergeableConst16Section =
Ctx->getELFSection(".rodata.cst16", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC |ELF::SHF_MERGE,
SectionKind::getMergeableConst16());
StaticCtorSection =
Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC |ELF::SHF_WRITE,
SectionKind::getDataRel());
StaticDtorSection =
Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC |ELF::SHF_WRITE,
SectionKind::getDataRel());
// Exception Handling Sections.
// FIXME: We're emitting LSDA info into a readonly section on ELF, even though
// it contains relocatable pointers. In PIC mode, this is probably a big
// runtime hit for C++ apps. Either the contents of the LSDA need to be
// adjusted or this should be a data section.
LSDASection =
Ctx->getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC,
SectionKind::getReadOnly());
// Debug Info Sections.
DwarfAbbrevSection =
Ctx->getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
SectionKind::getMetadata());
DwarfInfoSection =
Ctx->getELFSection(".debug_info", ELF::SHT_PROGBITS, 0,
SectionKind::getMetadata());
DwarfLineSection =
Ctx->getELFSection(".debug_line", ELF::SHT_PROGBITS, 0,
SectionKind::getMetadata());
DwarfFrameSection =
Ctx->getELFSection(".debug_frame", ELF::SHT_PROGBITS, 0,
SectionKind::getMetadata());
DwarfPubNamesSection =
Ctx->getELFSection(".debug_pubnames", ELF::SHT_PROGBITS, 0,
SectionKind::getMetadata());
DwarfPubTypesSection =
Ctx->getELFSection(".debug_pubtypes", ELF::SHT_PROGBITS, 0,
SectionKind::getMetadata());
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());
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());
}
void MCObjectFileInfo::InitCOFFMCObjectFileInfo(Triple T) {
// 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",
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.getOS() == Triple::Win32) {
StaticCtorSection =
Ctx->getCOFFSection(".CRT$XCU",
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ,
SectionKind::getReadOnly());
} else {
StaticCtorSection =
Ctx->getCOFFSection(".ctors",
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ |
COFF::IMAGE_SCN_MEM_WRITE,
SectionKind::getDataRel());
}
if (T.getOS() == Triple::Win32) {
StaticDtorSection =
Ctx->getCOFFSection(".CRT$XTX",
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ,
SectionKind::getReadOnly());
} else {
StaticDtorSection =
Ctx->getCOFFSection(".dtors",
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ |
COFF::IMAGE_SCN_MEM_WRITE,
SectionKind::getDataRel());
}
// FIXME: We're emitting LSDA info into a readonly section on COFF, even
// though it contains relocatable pointers. In PIC mode, this is probably a
// big runtime hit for C++ apps. Either the contents of the LSDA need to be
// adjusted or this should be a data section.
LSDASection =
Ctx->getCOFFSection(".gcc_except_table",
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ,
SectionKind::getReadOnly());
// Debug info.
DwarfAbbrevSection =
Ctx->getCOFFSection(".debug_abbrev",
COFF::IMAGE_SCN_MEM_DISCARDABLE |
COFF::IMAGE_SCN_MEM_READ,
SectionKind::getMetadata());
DwarfInfoSection =
Ctx->getCOFFSection(".debug_info",
COFF::IMAGE_SCN_MEM_DISCARDABLE |
COFF::IMAGE_SCN_MEM_READ,
SectionKind::getMetadata());
DwarfLineSection =
Ctx->getCOFFSection(".debug_line",
COFF::IMAGE_SCN_MEM_DISCARDABLE |
COFF::IMAGE_SCN_MEM_READ,
SectionKind::getMetadata());
DwarfFrameSection =
Ctx->getCOFFSection(".debug_frame",
COFF::IMAGE_SCN_MEM_DISCARDABLE |
COFF::IMAGE_SCN_MEM_READ,
SectionKind::getMetadata());
DwarfPubNamesSection =
Ctx->getCOFFSection(".debug_pubnames",
COFF::IMAGE_SCN_MEM_DISCARDABLE |
COFF::IMAGE_SCN_MEM_READ,
SectionKind::getMetadata());
DwarfPubTypesSection =
Ctx->getCOFFSection(".debug_pubtypes",
COFF::IMAGE_SCN_MEM_DISCARDABLE |
COFF::IMAGE_SCN_MEM_READ,
SectionKind::getMetadata());
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());
DrectveSection =
Ctx->getCOFFSection(".drectve",
COFF::IMAGE_SCN_LNK_INFO,
SectionKind::getMetadata());
PDataSection =
Ctx->getCOFFSection(".pdata",
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ,
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 TT, Reloc::Model relocm,
CodeModel::Model cm,
MCContext &ctx) {
RelocM = relocm;
CMModel = cm;
Ctx = &ctx;
// Common.
CommDirectiveSupportsAlignment = true;
SupportsWeakOmittedEHFrame = true;
IsFunctionEHFrameSymbolPrivate = true;
PersonalityEncoding = LSDAEncoding = FDEEncoding = FDECFIEncoding =
TTypeEncoding = dwarf::DW_EH_PE_absptr;
CompactUnwindDwarfEHFrameOnly = 0;
EHFrameSection = 0; // Created on demand.
CompactUnwindSection = 0; // Used only by selected targets.
DwarfAccelNamesSection = 0; // Used only by selected targets.
DwarfAccelObjCSection = 0; // Used only by selected targets.
DwarfAccelNamespaceSection = 0; // Used only by selected targets.
DwarfAccelTypesSection = 0; // Used only by selected targets.
Triple T(TT);
Triple::ArchType Arch = T.getArch();
// FIXME: Checking for Arch here to filter out bogus triples such as
// cellspu-apple-darwin. Perhaps we should fix in Triple?
if ((Arch == Triple::x86 || Arch == Triple::x86_64 ||
Arch == Triple::arm || Arch == Triple::thumb ||
Arch == Triple::ppc || Arch == Triple::ppc64 ||
Arch == Triple::UnknownArch) &&
(T.isOSDarwin() || T.getEnvironment() == Triple::MachO)) {
Env = IsMachO;
InitMachOMCObjectFileInfo(T);
} else if ((Arch == Triple::x86 || Arch == Triple::x86_64) &&
(T.getEnvironment() != Triple::ELF) &&
(T.getOS() == Triple::MinGW32 || T.getOS() == Triple::Cygwin ||
T.getOS() == Triple::Win32)) {
Env = IsCOFF;
InitCOFFMCObjectFileInfo(T);
} else {
Env = IsELF;
InitELFMCObjectFileInfo(T);
}
}
const MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
SectionKind::getMetadata(), 0, utostr(Hash));
}
const MCSection *
MCObjectFileInfo::getDwarfTypesDWOSection(uint64_t Hash) const {
return Ctx->getELFSection(".debug_types.dwo", ELF::SHT_GROUP, 0,
SectionKind::getMetadata(), 0, utostr(Hash));
}
void MCObjectFileInfo::InitEHFrameSection() {
if (Env == IsMachO)
EHFrameSection =
Ctx->getMachOSection("__TEXT", "__eh_frame",
MCSectionMachO::S_COALESCED |
MCSectionMachO::S_ATTR_NO_TOC |
MCSectionMachO::S_ATTR_STRIP_STATIC_SYMS |
MCSectionMachO::S_ATTR_LIVE_SUPPORT,
SectionKind::getReadOnly());
else if (Env == IsELF)
EHFrameSection =
Ctx->getELFSection(".eh_frame", 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());
}
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