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//===-- DarwinTargetAsmInfo.cpp - Darwin asm properties ---------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines target asm properties related what form asm statements
// should take in general on Darwin-based targets
//
//===----------------------------------------------------------------------===//
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Function.h"
#include "llvm/GlobalVariable.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Target/DarwinTargetAsmInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetData.h"
using namespace llvm;
DarwinTargetAsmInfo::DarwinTargetAsmInfo(const TargetMachine &TM) {
DTM = &TM;
CStringSection_ = getUnnamedSection("\t.cstring",
SectionFlags::Mergeable | SectionFlags::Strings);
FourByteConstantSection_ = getUnnamedSection("\t.literal4\n",
SectionFlags::Mergeable);
EightByteConstantSection_ = getUnnamedSection("\t.literal8\n",
SectionFlags::Mergeable);
// Note: 16-byte constant section is subtarget specific and should be provided
// there.
ReadOnlySection_ = getUnnamedSection("\t.const\n", SectionFlags::None);
// FIXME: These should be named sections, really.
TextCoalSection =
getUnnamedSection(".section __TEXT,__textcoal_nt,coalesced,pure_instructions",
SectionFlags::Code);
ConstDataCoalSection =
getUnnamedSection(".section __DATA,__const_coal,coalesced",
SectionFlags::None);
ConstDataSection = getUnnamedSection(".const_data", SectionFlags::None);
DataCoalSection = getUnnamedSection(".section __DATA,__datacoal_nt,coalesced",
SectionFlags::Writeable);
}
const Section*
DarwinTargetAsmInfo::SelectSectionForGlobal(const GlobalValue *GV,
bool NoCoalesce) const {
SectionKind::Kind Kind = SectionKindForGlobal(GV);
bool CanCoalesce = !NoCoalesce && GV->isWeakForLinker();
bool isNonStatic = (DTM->getRelocationModel() != Reloc::Static);
switch (Kind) {
case SectionKind::Text:
if (CanCoalesce)
return TextCoalSection;
else
return getTextSection_();
case SectionKind::Data:
case SectionKind::ThreadData:
case SectionKind::BSS:
case SectionKind::ThreadBSS:
if (cast<GlobalVariable>(GV)->isConstant())
return (CanCoalesce ? ConstDataCoalSection : ConstDataSection);
else
return (CanCoalesce ? DataCoalSection : getDataSection_());
case SectionKind::ROData:
return (CanCoalesce ? ConstDataCoalSection :
(isNonStatic ? ConstDataSection : getReadOnlySection_()));
case SectionKind::RODataMergeStr:
return (CanCoalesce ?
ConstDataCoalSection :
MergeableStringSection(cast<GlobalVariable>(GV)));
case SectionKind::RODataMergeConst:
return (CanCoalesce ?
ConstDataCoalSection:
MergeableConstSection(cast<GlobalVariable>(GV)));
default:
assert(0 && "Unsuported section kind for global");
}
// FIXME: Do we have any extra special weird cases?
}
const Section*
DarwinTargetAsmInfo::MergeableStringSection(const GlobalVariable *GV) const {
const TargetData *TD = DTM->getTargetData();
Constant *C = cast<GlobalVariable>(GV)->getInitializer();
const Type *Type = cast<ConstantArray>(C)->getType()->getElementType();
unsigned Size = TD->getABITypeSize(Type);
if (Size) {
const TargetData *TD = DTM->getTargetData();
unsigned Align = TD->getPreferredAlignment(GV);
if (Align <= 32)
return getCStringSection_();
}
return getReadOnlySection_();
}
const Section*
DarwinTargetAsmInfo::MergeableConstSection(const GlobalVariable *GV) const {
Constant *C = cast<GlobalVariable>(GV)->getInitializer();
return MergeableConstSection(C->getType());
}
inline const Section*
DarwinTargetAsmInfo::MergeableConstSection(const Type *Ty) const {
const TargetData *TD = DTM->getTargetData();
unsigned Size = TD->getABITypeSize(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);
// Handle weird special case, when compiling PIC stuff.
if (S == getReadOnlySection_() &&
DTM->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 "";
}
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