DarwinTargetAsmInfo.cpp [plain text]
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Function.h"
#include "llvm/GlobalVariable.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/Mangler.h"
#include "llvm/Target/DarwinTargetAsmInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetData.h"
using namespace llvm;
DarwinTargetAsmInfo::DarwinTargetAsmInfo(const TargetMachine &TM)
: TargetAsmInfo(TM) {
CStringSection_ = getUnnamedSection("\t.cstring",
SectionFlags::Mergeable | SectionFlags::Strings);
FourByteConstantSection = getUnnamedSection("\t.literal4\n",
SectionFlags::Mergeable);
EightByteConstantSection = getUnnamedSection("\t.literal8\n",
SectionFlags::Mergeable);
SixteenByteConstantSection = 0;
ReadOnlySection = getUnnamedSection("\t.const\n", SectionFlags::None);
TextCoalSection =
getNamedSection("\t__TEXT,__textcoal_nt,coalesced,pure_instructions",
SectionFlags::Code);
ConstTextCoalSection = getNamedSection("\t__TEXT,__const_coal,coalesced",
SectionFlags::None);
ConstDataCoalSection = getNamedSection("\t__DATA,__const_coal,coalesced",
SectionFlags::None);
ConstDataSection = getUnnamedSection(".const_data", SectionFlags::None);
DataCoalSection = getNamedSection("\t__DATA,__datacoal_nt,coalesced",
SectionFlags::Writeable);
}
bool
DarwinTargetAsmInfo::emitUsedDirectiveFor(const GlobalValue* GV,
Mangler *Mang) const {
if (GV==0)
return false;
if (GV->hasLocalLinkage() && !isa<Function>(GV) &&
((strlen(getPrivateGlobalPrefix()) != 0 &&
Mang->getValueName(GV).substr(0,strlen(getPrivateGlobalPrefix())) ==
getPrivateGlobalPrefix()) ||
(strlen(getLessPrivateGlobalPrefix()) != 0 &&
Mang->getValueName(GV).substr(0,strlen(getLessPrivateGlobalPrefix())) ==
getLessPrivateGlobalPrefix())))
return false;
return true;
}
const Section*
DarwinTargetAsmInfo::SelectSectionForGlobal(const GlobalValue *GV) const {
SectionKind::Kind Kind = SectionKindForGlobal(GV);
bool isWeak = GV->isWeakForLinker();
bool isNonStatic = TM.getRelocationModel() != Reloc::Static;
switch (Kind) {
case SectionKind::Text:
if (isWeak)
return TextCoalSection;
else
return TextSection;
case SectionKind::Data:
case SectionKind::ThreadData:
case SectionKind::BSS:
case SectionKind::ThreadBSS:
if (cast<GlobalVariable>(GV)->isConstant())
return (isWeak ? ConstDataCoalSection : ConstDataSection);
else
return (isWeak ? DataCoalSection : DataSection);
case SectionKind::ROData:
return (isWeak ? ConstDataCoalSection :
(isNonStatic ? ConstDataSection : getReadOnlySection()));
case SectionKind::RODataMergeStr:
return (isWeak ?
ConstTextCoalSection :
MergeableStringSection(cast<GlobalVariable>(GV)));
case SectionKind::RODataMergeConst:
return (isWeak ?
ConstDataCoalSection:
MergeableConstSection(cast<GlobalVariable>(GV)));
default:
assert(0 && "Unsuported section kind for global");
}
return NULL;
}
const Section*
DarwinTargetAsmInfo::MergeableStringSection(const GlobalVariable *GV) const {
const TargetData *TD = TM.getTargetData();
Constant *C = cast<GlobalVariable>(GV)->getInitializer();
const Type *Ty = cast<ArrayType>(C->getType())->getElementType();
unsigned Size = TD->getTypePaddedSize(Ty);
if (Size) {
unsigned Align = TD->getPreferredAlignment(GV);
if (Align <= 32)
return getCStringSection_();
}
return getReadOnlySection();
}
const Section*
DarwinTargetAsmInfo::MergeableConstSection(const GlobalVariable *GV) const {
Constant *C = GV->getInitializer();
return MergeableConstSection(C->getType());
}
inline const Section*
DarwinTargetAsmInfo::MergeableConstSection(const Type *Ty) const {
const TargetData *TD = TM.getTargetData();
unsigned Size = TD->getTypePaddedSize(Ty);
if (Size == 4)
return FourByteConstantSection;
else if (Size == 8)
return EightByteConstantSection;
else if (Size == 16 && SixteenByteConstantSection)
return SixteenByteConstantSection;
return getReadOnlySection();
}
const Section*
DarwinTargetAsmInfo::SelectSectionForMachineConst(const Type *Ty) const {
const Section* S = MergeableConstSection(Ty);
if (S == getReadOnlySection() &&
TM.getRelocationModel() != Reloc::Static)
return ConstDataSection;
return S;
}
std::string
DarwinTargetAsmInfo::UniqueSectionForGlobal(const GlobalValue* GV,
SectionKind::Kind kind) const {
assert(0 && "Darwin does not use unique sections");
return "";
}