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Move code only used by codegen out of MC. NFC.

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MC itself never needs to know about these sections.

llvm-svn: 279965
This commit is contained in:
Rafael Espindola 2016-08-29 12:33:42 +00:00
parent 1ffe62f2c3
commit f7e5d81bb8
5 changed files with 65 additions and 52 deletions
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3
include/llvm/CodeGen/TargetLoweringObjectFileImpl.h
View File

@ -98,6 +98,8 @@ public:
~TargetLoweringObjectFileMachO() override {}
TargetLoweringObjectFileMachO();
void Initialize(MCContext &Ctx, const TargetMachine &TM) override;
/// Emit the module flags that specify the garbage collection information.
void emitModuleFlags(MCStreamer &Streamer,
ArrayRef<Module::ModuleFlagEntry> ModuleFlags,
@ -145,6 +147,7 @@ class TargetLoweringObjectFileCOFF : public TargetLoweringObjectFile {
public:
~TargetLoweringObjectFileCOFF() override {}
void Initialize(MCContext &Ctx, const TargetMachine &TM) override;
MCSection *getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler &Mang,
const TargetMachine &TM) const override;

6
include/llvm/MC/MCObjectFileInfo.h
View File

@ -65,12 +65,6 @@ protected:
/// constants.
MCSection *ReadOnlySection;
/// This section contains the static constructor pointer list.
MCSection *StaticCtorSection;
/// This section contains the static destructor pointer list.
MCSection *StaticDtorSection;
/// If exception handling is supported by the target, this is the section the
/// Language Specific Data Area information is emitted to.
MCSection *LSDASection;

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

@ -45,6 +45,12 @@ protected:
bool SupportIndirectSymViaGOTPCRel;
bool SupportGOTPCRelWithOffset;
/// This section contains the static constructor pointer list.
MCSection *StaticCtorSection;
/// This section contains the static destructor pointer list.
MCSection *StaticDtorSection;
public:
MCContext &getContext() const { return *Ctx; }

62
lib/CodeGen/TargetLoweringObjectFileImpl.cpp
View File

@ -446,13 +446,20 @@ const MCExpr *TargetLoweringObjectFileELF::lowerRelativeReference(
void
TargetLoweringObjectFileELF::InitializeELF(bool UseInitArray_) {
UseInitArray = UseInitArray_;
if (!UseInitArray)
return;
MCContext &Ctx = getContext();
if (!UseInitArray) {
StaticCtorSection = Ctx.getELFSection(".ctors", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC | ELF::SHF_WRITE);
StaticCtorSection = getContext().getELFSection(
".init_array", ELF::SHT_INIT_ARRAY, ELF::SHF_WRITE | ELF::SHF_ALLOC);
StaticDtorSection = getContext().getELFSection(
".fini_array", ELF::SHT_FINI_ARRAY, ELF::SHF_WRITE | ELF::SHF_ALLOC);
StaticDtorSection = Ctx.getELFSection(".dtors", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC | ELF::SHF_WRITE);
return;
}
StaticCtorSection = Ctx.getELFSection(".init_array", ELF::SHT_INIT_ARRAY,
ELF::SHF_WRITE | ELF::SHF_ALLOC);
StaticDtorSection = Ctx.getELFSection(".fini_array", ELF::SHT_FINI_ARRAY,
ELF::SHF_WRITE | ELF::SHF_ALLOC);
}
//===----------------------------------------------------------------------===//
@ -464,6 +471,24 @@ TargetLoweringObjectFileMachO::TargetLoweringObjectFileMachO()
SupportIndirectSymViaGOTPCRel = true;
}
void TargetLoweringObjectFileMachO::Initialize(MCContext &Ctx,
const TargetMachine &TM) {
TargetLoweringObjectFile::Initialize(Ctx, TM);
if (!TM.isPositionIndependent()) {
StaticCtorSection = Ctx.getMachOSection("__TEXT", "__constructor", 0,
SectionKind::getData());
StaticDtorSection = Ctx.getMachOSection("__TEXT", "__destructor", 0,
SectionKind::getData());
} else {
StaticCtorSection = Ctx.getMachOSection("__DATA", "__mod_init_func",
MachO::S_MOD_INIT_FUNC_POINTERS,
SectionKind::getData());
StaticDtorSection = Ctx.getMachOSection("__DATA", "__mod_term_func",
MachO::S_MOD_TERM_FUNC_POINTERS,
SectionKind::getData());
}
}
/// emitModuleFlags - Perform code emission for module flags.
void TargetLoweringObjectFileMachO::
emitModuleFlags(MCStreamer &Streamer,
@ -1052,6 +1077,31 @@ emitModuleFlags(MCStreamer &Streamer,
}
}
void TargetLoweringObjectFileCOFF::Initialize(MCContext &Ctx,
const TargetMachine &TM) {
TargetLoweringObjectFile::Initialize(Ctx, TM);
const Triple &T = TM.getTargetTriple();
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::getData());
StaticDtorSection = Ctx.getCOFFSection(
".dtors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
SectionKind::getData());
}
}
MCSection *TargetLoweringObjectFileCOFF::getStaticCtorSection(
unsigned Priority, const MCSymbol *KeySym) const {
return getContext().getAssociativeCOFFSection(

40
lib/MC/MCObjectFileInfo.cpp
View File

@ -177,20 +177,6 @@ void MCObjectFileInfo::initMachOMCObjectFileInfo(const Triple &T) {
MachO::S_THREAD_LOCAL_VARIABLE_POINTERS,
SectionKind::getMetadata());
if (!PositionIndependent) {
StaticCtorSection = Ctx->getMachOSection("__TEXT", "__constructor", 0,
SectionKind::getData());
StaticDtorSection = Ctx->getMachOSection("__TEXT", "__destructor", 0,
SectionKind::getData());
} else {
StaticCtorSection = Ctx->getMachOSection("__DATA", "__mod_init_func",
MachO::S_MOD_INIT_FUNC_POINTERS,
SectionKind::getData());
StaticDtorSection = Ctx->getMachOSection("__DATA", "__mod_term_func",
MachO::S_MOD_TERM_FUNC_POINTERS,
SectionKind::getData());
}
// Exception Handling.
LSDASection = Ctx->getMachOSection("__TEXT", "__gcc_except_tab", 0,
SectionKind::getReadOnlyWithRel());
@ -507,12 +493,6 @@ void MCObjectFileInfo::initELFMCObjectFileInfo(const Triple &T) {
Ctx->getELFSection(".rodata.cst32", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC | ELF::SHF_MERGE, 32, "");
StaticCtorSection = Ctx->getELFSection(".ctors", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC | ELF::SHF_WRITE);
StaticDtorSection = Ctx->getELFSection(".dtors", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC | ELF::SHF_WRITE);
// Exception Handling Sections.
// FIXME: We're emitting LSDA info into a readonly section on ELF, even though
@ -630,26 +610,6 @@ void MCObjectFileInfo::initCOFFMCObjectFileInfo(const Triple &T) {
".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::getData());
StaticDtorSection = Ctx->getCOFFSection(
".dtors", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
COFF::IMAGE_SCN_MEM_READ | COFF::IMAGE_SCN_MEM_WRITE,
SectionKind::getData());
}
// 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