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Code Issues Projects Releases Wiki Activity

Simplify the creation of .eh_frame/.debug_frame sections.

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llvm-svn: 252305
This commit is contained in:
Rafael Espindola 2015-11-06 14:47:44 +00:00
parent 654fc11285
commit 43062a30b0
2 changed files with 18 additions and 33 deletions
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9
include/llvm/MC/MCObjectFileInfo.h
View File

@ -47,10 +47,6 @@ protected:
unsigned FDECFIEncoding;
unsigned TTypeEncoding;
/// Section flags for eh_frame
unsigned EHSectionType;
unsigned EHSectionFlags;
/// Compact unwind encoding indicating that we should emit only an EH frame.
unsigned CompactUnwindDwarfEHFrameOnly;
@ -336,8 +332,6 @@ public:
MCSection *getSXDataSection() const { return SXDataSection; }
MCSection *getEHFrameSection() {
if (!EHFrameSection)
InitEHFrameSection();
return EHFrameSection;
}
@ -357,9 +351,6 @@ private:
void initELFMCObjectFileInfo(Triple T);
void initCOFFMCObjectFileInfo(Triple T);
/// Initialize EHFrameSection on demand.
void InitEHFrameSection();
public:
const Triple &getTargetTriple() const { return TT; }
};

42
lib/MC/MCObjectFileInfo.cpp
View File

@ -49,6 +49,12 @@ void MCObjectFileInfo::initMachOMCObjectFileInfo(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)
SupportsCompactUnwindWithoutEHFrame = true;
@ -416,12 +422,13 @@ void MCObjectFileInfo::initELFMCObjectFileInfo(Triple T) {
break;
}
EHSectionType = T.getArch() == Triple::x86_64 ? ELF::SHT_X86_64_UNWIND
: ELF::SHT_PROGBITS;
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.
EHSectionFlags = ELF::SHF_ALLOC;
unsigned EHSectionFlags = ELF::SHF_ALLOC;
if (T.isOSSolaris() && T.getArch() != Triple::x86_64)
EHSectionFlags |= ELF::SHF_WRITE;
@ -546,9 +553,17 @@ void MCObjectFileInfo::initELFMCObjectFileInfo(Triple T) {
FaultMapSection =
Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
EHFrameSection =
Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags);
}
void MCObjectFileInfo::initCOFFMCObjectFileInfo(Triple T) {
EHFrameSection = Ctx->getCOFFSection(
".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
SectionKind::getDataRel());
bool IsWoA = T.getArch() == Triple::arm || T.getArch() == Triple::thumb;
CommDirectiveSupportsAlignment = true;
@ -822,24 +837,3 @@ MCSection *MCObjectFileInfo::getDwarfTypesSection(uint64_t Hash) const {
return Ctx->getELFSection(".debug_types", ELF::SHT_PROGBITS, ELF::SHF_GROUP,
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);
else
EHFrameSection =
Ctx->getCOFFSection(".eh_frame",
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ |
COFF::IMAGE_SCN_MEM_WRITE,
SectionKind::getDataRel());
}