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Delay the creation of eh_frame so that the user can change the defaults.

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Add support for SHT_X86_64_UNWIND.

llvm-svn: 124059
This commit is contained in:
Rafael Espindola 2011-01-23 05:43:40 +00:00
parent f881ff46fe
commit aefd549139
8 changed files with 51 additions and 26 deletions
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6
include/llvm/CodeGen/TargetLoweringObjectFileImpl.h
View File

@ -57,6 +57,8 @@ public:
virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
virtual const MCSection *getEHFrameSection() const;
const MCSection *getDataRelSection() const { return DataRelSection; }
/// getSectionForConstant - Given a constant with the SectionKind, return a
@ -121,6 +123,8 @@ public:
virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
virtual const MCSection *getEHFrameSection() const;
virtual const MCSection *
SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler *Mang, const TargetMachine &TM) const;
@ -184,6 +188,8 @@ public:
virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
virtual const MCSection *getEHFrameSection() const;
virtual const MCSection *getDrectveSection() const { return DrectveSection; }
virtual const MCSection *

2
include/llvm/Support/ELF.h
View File

@ -501,6 +501,8 @@ enum {
SHT_ARM_DEBUGOVERLAY = 0x70000004U,
SHT_ARM_OVERLAYSECTION = 0x70000005U,
SHT_X86_64_UNWIND = 0x70000001, // Unwind information
SHT_HIPROC = 0x7fffffff, // Highest processor architecture-specific type.
SHT_LOUSER = 0x80000000, // Lowest type reserved for applications.
SHT_HIUSER = 0xffffffff // Highest type reserved for applications.

6
include/llvm/Target/TargetLoweringObjectFile.h
View File

@ -69,10 +69,6 @@ protected:
/// the section the Language Specific Data Area information is emitted to.
const MCSection *LSDASection;
/// EHFrameSection - If exception handling is supported by the target, this is
/// the section the EH Frame is emitted to.
const MCSection *EHFrameSection;
// Dwarf sections for debug info. If a target supports debug info, these must
// be set.
const MCSection *DwarfAbbrevSection;
@ -143,7 +139,7 @@ public:
const MCSection *getStaticCtorSection() const { return StaticCtorSection; }
const MCSection *getStaticDtorSection() const { return StaticDtorSection; }
const MCSection *getLSDASection() const { return LSDASection; }
const MCSection *getEHFrameSection() const { return EHFrameSection; }
virtual const MCSection *getEHFrameSection() const = 0;
const MCSection *getDwarfAbbrevSection() const { return DwarfAbbrevSection; }
const MCSection *getDwarfInfoSection() const { return DwarfInfoSection; }
const MCSection *getDwarfLineSection() const { return DwarfLineSection; }

43
lib/CodeGen/TargetLoweringObjectFileImpl.cpp
View File

@ -134,11 +134,6 @@ void TargetLoweringObjectFileELF::Initialize(MCContext &Ctx,
getContext().getELFSection(".gcc_except_table", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC,
SectionKind::getReadOnly());
EHFrameSection =
getContext().getELFSection(".eh_frame", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC,
SectionKind::getDataRel());
// Debug Info Sections.
DwarfAbbrevSection =
getContext().getELFSection(".debug_abbrev", ELF::SHT_PROGBITS, 0,
@ -175,6 +170,11 @@ void TargetLoweringObjectFileELF::Initialize(MCContext &Ctx,
SectionKind::getMetadata());
}
const MCSection *TargetLoweringObjectFileELF::getEHFrameSection() const {
return getContext().getELFSection(".eh_frame", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC,
SectionKind::getDataRel());
}
static SectionKind
getELFKindForNamedSection(StringRef Name, SectionKind K) {
@ -581,14 +581,6 @@ void TargetLoweringObjectFileMachO::Initialize(MCContext &Ctx,
// Exception Handling.
LSDASection = getContext().getMachOSection("__TEXT", "__gcc_except_tab", 0,
SectionKind::getReadOnlyWithRel());
EHFrameSection =
getContext().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());
// Debug Information.
DwarfAbbrevSection =
getContext().getMachOSection("__DWARF", "__debug_abbrev",
@ -642,6 +634,15 @@ void TargetLoweringObjectFileMachO::Initialize(MCContext &Ctx,
TLSExtraDataSection = TLSTLVSection;
}
const MCSection *TargetLoweringObjectFileMachO::getEHFrameSection() const {
return getContext().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());
}
const MCSection *TargetLoweringObjectFileMachO::
getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler *Mang, const TargetMachine &TM) const {
@ -873,13 +874,6 @@ void TargetLoweringObjectFileCOFF::Initialize(MCContext &Ctx,
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ,
SectionKind::getReadOnly());
EHFrameSection =
getContext().getCOFFSection(".eh_frame",
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ |
COFF::IMAGE_SCN_MEM_WRITE,
SectionKind::getDataRel());
// Debug info.
DwarfAbbrevSection =
getContext().getCOFFSection(".debug_abbrev",
@ -943,6 +937,15 @@ void TargetLoweringObjectFileCOFF::Initialize(MCContext &Ctx,
SectionKind::getMetadata());
}
const MCSection *TargetLoweringObjectFileCOFF::getEHFrameSection() const {
return getContext().getCOFFSection(".eh_frame",
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ |
COFF::IMAGE_SCN_MEM_WRITE,
SectionKind::getDataRel());
}
static unsigned
getCOFFSectionFlags(SectionKind K) {
unsigned Flags = 0;

1
lib/MC/ELFObjectWriter.cpp
View File

@ -1271,6 +1271,7 @@ void ELFObjectWriter::WriteSection(MCAssembler &Asm,
case ELF::SHT_INIT_ARRAY:
case ELF::SHT_FINI_ARRAY:
case ELF::SHT_PREINIT_ARRAY:
case ELF::SHT_X86_64_UNWIND:
// Nothing to do.
break;

2
lib/MC/MCParser/ELFAsmParser.cpp
View File

@ -338,6 +338,8 @@ bool ELFAsmParser::ParseDirectiveSection(StringRef, SMLoc) {
Type = ELF::SHT_PROGBITS;
else if (TypeName == "note")
Type = ELF::SHT_NOTE;
else if (TypeName == "unwind")
Type = ELF::SHT_X86_64_UNWIND;
else
return TokError("unknown section type");
}

1
lib/Target/TargetLoweringObjectFile.cpp
View File

@ -43,7 +43,6 @@ TargetLoweringObjectFile::TargetLoweringObjectFile() : Ctx(0) {
StaticCtorSection = 0;
StaticDtorSection = 0;
LSDASection = 0;
EHFrameSection = 0;
CommDirectiveSupportsAlignment = true;
DwarfAbbrevSection = 0;

16
test/MC/ELF/section.s
View File

@ -85,3 +85,19 @@ foo:
bar:
.section .text.foo,"axG",@progbits,foo,comdat
.section .text.bar,"axMG",@progbits,42,bar,comdat
// Test that the default values are not used
.section .eh_frame,"a",@unwind
// CHECK: (('sh_name', 0x00000080) # '.eh_frame'
// CHECK-NEXT: ('sh_type', 0x70000001)
// CHECK-NEXT: ('sh_flags', 0x00000002)
// CHECK-NEXT: ('sh_addr', 0x00000000)
// CHECK-NEXT: ('sh_offset', 0x00000050)
// CHECK-NEXT: ('sh_size', 0x00000000)
// CHECK-NEXT: ('sh_link', 0x00000000)
// CHECK-NEXT: ('sh_info', 0x00000000)
// CHECK-NEXT: ('sh_addralign', 0x00000001)
// CHECK-NEXT: ('sh_entsize', 0x00000000)
// CHECK-NEXT: ),