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//===-- XCoreTargetObjectFile.cpp - XCore object files --------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "XCoreTargetObjectFile.h"
#include "XCoreSubtarget.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/Support/ELF.h"
#include "llvm/Target/TargetMachine.h"
using namespace llvm;
void XCoreTargetObjectFile::Initialize(MCContext &Ctx, const TargetMachine &TM){
TargetLoweringObjectFileELF::Initialize(Ctx, TM);
BSSSection =
Ctx.getELFSection(".dp.bss", ELF::SHT_NOBITS,
ELF::SHF_ALLOC | ELF::SHF_WRITE |
ELF::XCORE_SHF_DP_SECTION,
SectionKind::getBSS());
BSSSectionLarge =
Ctx.getELFSection(".dp.bss.large", ELF::SHT_NOBITS,
ELF::SHF_ALLOC | ELF::SHF_WRITE |
ELF::XCORE_SHF_DP_SECTION,
SectionKind::getBSS());
DataSection =
Ctx.getELFSection(".dp.data", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC | ELF::SHF_WRITE |
ELF::XCORE_SHF_DP_SECTION,
SectionKind::getDataRel());
DataSectionLarge =
Ctx.getELFSection(".dp.data.large", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC | ELF::SHF_WRITE |
ELF::XCORE_SHF_DP_SECTION,
SectionKind::getDataRel());
// This is the wrong place to decide if const data should be placed
// in the .cp or .dp section.
// Ideally we should set up DataRelROSection to use the '.dp.'' and use this
// for const data, unless the front end explicitly states a '.cp.'' section.
ReadOnlySection =
Ctx.getELFSection(".cp.rodata", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC |
ELF::XCORE_SHF_CP_SECTION,
SectionKind::getReadOnlyWithRel());
ReadOnlySectionLarge =
Ctx.getELFSection(".cp.rodata.large", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC |
ELF::XCORE_SHF_CP_SECTION,
SectionKind::getReadOnlyWithRel());
MergeableConst4Section =
Ctx.getELFSection(".cp.rodata.cst4", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC | ELF::SHF_MERGE |
ELF::XCORE_SHF_CP_SECTION,
SectionKind::getMergeableConst4());
MergeableConst8Section =
Ctx.getELFSection(".cp.rodata.cst8", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC | ELF::SHF_MERGE |
ELF::XCORE_SHF_CP_SECTION,
SectionKind::getMergeableConst8());
MergeableConst16Section =
Ctx.getELFSection(".cp.rodata.cst16", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC | ELF::SHF_MERGE |
ELF::XCORE_SHF_CP_SECTION,
SectionKind::getMergeableConst16());
CStringSection =
Ctx.getELFSection(".cp.rodata.string", ELF::SHT_PROGBITS,
ELF::SHF_ALLOC | ELF::SHF_MERGE | ELF::SHF_STRINGS |
ELF::XCORE_SHF_CP_SECTION,
SectionKind::getReadOnlyWithRel());
// TextSection - see MObjectFileInfo.cpp
// StaticCtorSection - see MObjectFileInfo.cpp
// StaticDtorSection - see MObjectFileInfo.cpp
}
static SectionKind getXCoreKindForNamedSection(StringRef Name, SectionKind K) {
if (Name.startswith(".cp."))
return SectionKind::getReadOnly();
return K;
}
static unsigned getXCoreSectionType(SectionKind K) {
if (K.isBSS())
return ELF::SHT_NOBITS;
return ELF::SHT_PROGBITS;
}
static unsigned getXCoreSectionFlags(SectionKind K) {
unsigned Flags = 0;
if (!K.isMetadata())
Flags |= ELF::SHF_ALLOC;
if (K.isText())
Flags |= ELF::SHF_EXECINSTR;
else if (K.isReadOnly())
Flags |= ELF::XCORE_SHF_CP_SECTION;
else
Flags |= ELF::XCORE_SHF_DP_SECTION;
if (K.isWriteable())
Flags |= ELF::SHF_WRITE;
if (K.isMergeableCString() || K.isMergeableConst4() ||
K.isMergeableConst8() || K.isMergeableConst16())
Flags |= ELF::SHF_MERGE;
if (K.isMergeableCString())
Flags |= ELF::SHF_STRINGS;
return Flags;
}
const MCSection *XCoreTargetObjectFile::
getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
Mangler &Mang, const TargetMachine &TM) const {
StringRef SectionName = GV->getSection();
// Infer section flags from the section name if we can.
Kind = getXCoreKindForNamedSection(SectionName, Kind);
return getContext().getELFSection(SectionName, getXCoreSectionType(Kind),
getXCoreSectionFlags(Kind), Kind);
}
const MCSection *XCoreTargetObjectFile::
SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind, Mangler &Mang,
const TargetMachine &TM) const{
if (Kind.isText()) return TextSection;
if (Kind.isMergeable1ByteCString()) return CStringSection;
if (Kind.isMergeableConst4()) return MergeableConst4Section;
if (Kind.isMergeableConst8()) return MergeableConst8Section;
if (Kind.isMergeableConst16()) return MergeableConst16Section;
Type *ObjType = GV->getType()->getPointerElementType();
if (TM.getCodeModel() == CodeModel::Small ||
!ObjType->isSized() ||
TM.getDataLayout()->getTypeAllocSize(ObjType) < CodeModelLargeSize) {
if (Kind.isReadOnly()) return ReadOnlySection;
if (Kind.isBSS()) return BSSSection;
if (Kind.isDataRel()) return DataSection;
if (Kind.isReadOnlyWithRel()) return ReadOnlySection;
} else {
if (Kind.isReadOnly()) return ReadOnlySectionLarge;
if (Kind.isBSS()) return BSSSectionLarge;
if (Kind.isDataRel()) return DataSectionLarge;
if (Kind.isReadOnlyWithRel()) return ReadOnlySectionLarge;
}
assert((Kind.isThreadLocal() || Kind.isCommon()) && "Unknown section kind");
report_fatal_error("Target does not support TLS or Common sections");
}
const MCSection *XCoreTargetObjectFile::
getSectionForConstant(SectionKind Kind) const {
if (Kind.isMergeableConst4()) return MergeableConst4Section;
if (Kind.isMergeableConst8()) return MergeableConst8Section;
if (Kind.isMergeableConst16()) return MergeableConst16Section;
assert((Kind.isReadOnly() || Kind.isReadOnlyWithRel()) &&
"Unknown section kind");
// We assume the size of the object is never greater than CodeModelLargeSize.
// To handle CodeModelLargeSize changes to AsmPrinter would be required.
return ReadOnlySection;
}
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