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https://github.com/c64scene-ar/llvm-6502.git
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r201608 made llvm corretly handle private globals with MachO. r201622 fixed a bug in it and r201624 and r201625 were changes for using private linkage, assuming that llvm would do the right thing. They all got reverted because r201608 introduced a crash in LTO. This patch includes a fix for that. The issue was that TargetLoweringObjectFile now has to be initialized before we can mangle names of private globals. This is trivially true during the normal codegen pipeline (the asm printer does it), but LTO has to do it manually. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201700 91177308-0d34-0410-b5e6-96231b3b80d8
179 lines
7.2 KiB
C++
179 lines
7.2 KiB
C++
//===-- XCoreTargetObjectFile.cpp - XCore object files --------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "XCoreTargetObjectFile.h"
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#include "XCoreSubtarget.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCSectionELF.h"
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#include "llvm/Support/ELF.h"
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#include "llvm/Target/TargetMachine.h"
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using namespace llvm;
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void XCoreTargetObjectFile::Initialize(MCContext &Ctx, const TargetMachine &TM){
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TargetLoweringObjectFileELF::Initialize(Ctx, TM);
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BSSSection =
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Ctx.getELFSection(".dp.bss", ELF::SHT_NOBITS,
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ELF::SHF_ALLOC | ELF::SHF_WRITE |
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ELF::XCORE_SHF_DP_SECTION,
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SectionKind::getBSS());
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BSSSectionLarge =
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Ctx.getELFSection(".dp.bss.large", ELF::SHT_NOBITS,
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ELF::SHF_ALLOC | ELF::SHF_WRITE |
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ELF::XCORE_SHF_DP_SECTION,
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SectionKind::getBSS());
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DataSection =
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Ctx.getELFSection(".dp.data", ELF::SHT_PROGBITS,
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ELF::SHF_ALLOC | ELF::SHF_WRITE |
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ELF::XCORE_SHF_DP_SECTION,
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SectionKind::getDataRel());
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DataSectionLarge =
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Ctx.getELFSection(".dp.data.large", ELF::SHT_PROGBITS,
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ELF::SHF_ALLOC | ELF::SHF_WRITE |
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ELF::XCORE_SHF_DP_SECTION,
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SectionKind::getDataRel());
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DataRelROSection =
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Ctx.getELFSection(".dp.rodata", ELF::SHT_PROGBITS,
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ELF::SHF_ALLOC | ELF::SHF_WRITE |
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ELF::XCORE_SHF_DP_SECTION,
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SectionKind::getReadOnlyWithRel());
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DataRelROSectionLarge =
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Ctx.getELFSection(".dp.rodata.large", ELF::SHT_PROGBITS,
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ELF::SHF_ALLOC | ELF::SHF_WRITE |
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ELF::XCORE_SHF_DP_SECTION,
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SectionKind::getReadOnlyWithRel());
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ReadOnlySection =
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Ctx.getELFSection(".cp.rodata", ELF::SHT_PROGBITS,
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ELF::SHF_ALLOC |
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ELF::XCORE_SHF_CP_SECTION,
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SectionKind::getReadOnlyWithRel());
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ReadOnlySectionLarge =
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Ctx.getELFSection(".cp.rodata.large", ELF::SHT_PROGBITS,
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ELF::SHF_ALLOC |
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ELF::XCORE_SHF_CP_SECTION,
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SectionKind::getReadOnlyWithRel());
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MergeableConst4Section =
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Ctx.getELFSection(".cp.rodata.cst4", ELF::SHT_PROGBITS,
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ELF::SHF_ALLOC | ELF::SHF_MERGE |
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ELF::XCORE_SHF_CP_SECTION,
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SectionKind::getMergeableConst4());
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MergeableConst8Section =
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Ctx.getELFSection(".cp.rodata.cst8", ELF::SHT_PROGBITS,
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ELF::SHF_ALLOC | ELF::SHF_MERGE |
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ELF::XCORE_SHF_CP_SECTION,
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SectionKind::getMergeableConst8());
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MergeableConst16Section =
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Ctx.getELFSection(".cp.rodata.cst16", ELF::SHT_PROGBITS,
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ELF::SHF_ALLOC | ELF::SHF_MERGE |
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ELF::XCORE_SHF_CP_SECTION,
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SectionKind::getMergeableConst16());
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CStringSection =
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Ctx.getELFSection(".cp.rodata.string", ELF::SHT_PROGBITS,
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ELF::SHF_ALLOC | ELF::SHF_MERGE | ELF::SHF_STRINGS |
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ELF::XCORE_SHF_CP_SECTION,
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SectionKind::getReadOnlyWithRel());
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// TextSection - see MObjectFileInfo.cpp
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// StaticCtorSection - see MObjectFileInfo.cpp
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// StaticDtorSection - see MObjectFileInfo.cpp
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}
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static unsigned getXCoreSectionType(SectionKind K) {
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if (K.isBSS())
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return ELF::SHT_NOBITS;
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return ELF::SHT_PROGBITS;
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}
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static unsigned getXCoreSectionFlags(SectionKind K, bool IsCPRel) {
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unsigned Flags = 0;
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if (!K.isMetadata())
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Flags |= ELF::SHF_ALLOC;
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if (K.isText())
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Flags |= ELF::SHF_EXECINSTR;
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else if (IsCPRel)
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Flags |= ELF::XCORE_SHF_CP_SECTION;
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else
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Flags |= ELF::XCORE_SHF_DP_SECTION;
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if (K.isWriteable())
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Flags |= ELF::SHF_WRITE;
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if (K.isMergeableCString() || K.isMergeableConst4() ||
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K.isMergeableConst8() || K.isMergeableConst16())
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Flags |= ELF::SHF_MERGE;
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if (K.isMergeableCString())
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Flags |= ELF::SHF_STRINGS;
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return Flags;
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}
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const MCSection *
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XCoreTargetObjectFile::getExplicitSectionGlobal(const GlobalValue *GV,
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SectionKind Kind, Mangler &Mang,
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const TargetMachine &TM) const {
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StringRef SectionName = GV->getSection();
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// Infer section flags from the section name if we can.
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bool IsCPRel = SectionName.startswith(".cp.");
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if (IsCPRel && !Kind.isReadOnly())
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report_fatal_error("Using .cp. section for writeable object.");
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return getContext().getELFSection(SectionName, getXCoreSectionType(Kind),
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getXCoreSectionFlags(Kind, IsCPRel), Kind);
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}
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const MCSection *XCoreTargetObjectFile::
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SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind, Mangler &Mang,
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const TargetMachine &TM) const{
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bool UseCPRel = GV->isLocalLinkage(GV->getLinkage());
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if (Kind.isText()) return TextSection;
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if (UseCPRel) {
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if (Kind.isMergeable1ByteCString()) return CStringSection;
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if (Kind.isMergeableConst4()) return MergeableConst4Section;
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if (Kind.isMergeableConst8()) return MergeableConst8Section;
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if (Kind.isMergeableConst16()) return MergeableConst16Section;
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}
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Type *ObjType = GV->getType()->getPointerElementType();
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if (TM.getCodeModel() == CodeModel::Small ||
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!ObjType->isSized() ||
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TM.getDataLayout()->getTypeAllocSize(ObjType) < CodeModelLargeSize) {
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if (Kind.isReadOnly()) return UseCPRel? ReadOnlySection
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: DataRelROSection;
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if (Kind.isBSS() || Kind.isCommon())return BSSSection;
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if (Kind.isDataRel()) return DataSection;
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if (Kind.isReadOnlyWithRel()) return DataRelROSection;
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} else {
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if (Kind.isReadOnly()) return UseCPRel? ReadOnlySectionLarge
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: DataRelROSectionLarge;
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if (Kind.isBSS() || Kind.isCommon())return BSSSectionLarge;
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if (Kind.isDataRel()) return DataSectionLarge;
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if (Kind.isReadOnlyWithRel()) return DataRelROSectionLarge;
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}
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assert((Kind.isThreadLocal() || Kind.isCommon()) && "Unknown section kind");
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report_fatal_error("Target does not support TLS or Common sections");
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}
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const MCSection *XCoreTargetObjectFile::
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getSectionForConstant(SectionKind Kind) const {
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if (Kind.isMergeableConst4()) return MergeableConst4Section;
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if (Kind.isMergeableConst8()) return MergeableConst8Section;
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if (Kind.isMergeableConst16()) return MergeableConst16Section;
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assert((Kind.isReadOnly() || Kind.isReadOnlyWithRel()) &&
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"Unknown section kind");
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// We assume the size of the object is never greater than CodeModelLargeSize.
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// To handle CodeModelLargeSize changes to AsmPrinter would be required.
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return ReadOnlySection;
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}
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