mirror of
https://github.com/c64scene-ar/llvm-6502.git
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r165941: Resubmit the changes to llvm core to update the functions to support different pointer sizes on a per address space basis. Despite this commit log, this change primarily changed stuff outside of VMCore, and those changes do not carry any tests for correctness (or even plausibility), and we have consistently found questionable or flat out incorrect cases in these changes. Most of them are probably correct, but we need to devise a system that makes it more clear when we have handled the address space concerns correctly, and ideally each pass that gets updated would receive an accompanying test case that exercises that pass specificaly w.r.t. alternate address spaces. However, from this commit, I have retained the new C API entry points. Those were an orthogonal change that probably should have been split apart, but they seem entirely good. In several places the changes were very obvious cleanups with no actual multiple address space code added; these I have not reverted when I spotted them. In a few other places there were merge conflicts due to a cleaner solution being implemented later, often not using address spaces at all. In those cases, I've preserved the new code which isn't address space dependent. This is part of my ongoing effort to clean out the partial address space code which carries high risk and low test coverage, and not likely to be finished before the 3.2 release looms closer. Duncan and I would both like to see the above issues addressed before we return to these changes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167222 91177308-0d34-0410-b5e6-96231b3b80d8
751 lines
27 KiB
C++
751 lines
27 KiB
C++
//===-- llvm/CodeGen/TargetLoweringObjectFileImpl.cpp - Object File Info --===//
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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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//
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// This file implements classes used to handle lowerings specific to common
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// object file formats.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Function.h"
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#include "llvm/GlobalVariable.h"
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#include "llvm/Module.h"
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#include "llvm/CodeGen/MachineModuleInfoImpls.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCSectionMachO.h"
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#include "llvm/MC/MCSectionELF.h"
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#include "llvm/MC/MCSectionCOFF.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Target/Mangler.h"
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#include "llvm/DataLayout.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/Support/Dwarf.h"
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#include "llvm/Support/ELF.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ADT/Triple.h"
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using namespace llvm;
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using namespace dwarf;
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//===----------------------------------------------------------------------===//
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// ELF
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//===----------------------------------------------------------------------===//
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MCSymbol *
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TargetLoweringObjectFileELF::getCFIPersonalitySymbol(const GlobalValue *GV,
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Mangler *Mang,
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MachineModuleInfo *MMI) const {
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unsigned Encoding = getPersonalityEncoding();
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switch (Encoding & 0x70) {
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default:
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report_fatal_error("We do not support this DWARF encoding yet!");
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case dwarf::DW_EH_PE_absptr:
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return Mang->getSymbol(GV);
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case dwarf::DW_EH_PE_pcrel: {
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return getContext().GetOrCreateSymbol(StringRef("DW.ref.") +
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Mang->getSymbol(GV)->getName());
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}
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}
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}
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void TargetLoweringObjectFileELF::emitPersonalityValue(MCStreamer &Streamer,
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const TargetMachine &TM,
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const MCSymbol *Sym) const {
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SmallString<64> NameData("DW.ref.");
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NameData += Sym->getName();
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MCSymbol *Label = getContext().GetOrCreateSymbol(NameData);
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Streamer.EmitSymbolAttribute(Label, MCSA_Hidden);
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Streamer.EmitSymbolAttribute(Label, MCSA_Weak);
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StringRef Prefix = ".data.";
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NameData.insert(NameData.begin(), Prefix.begin(), Prefix.end());
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unsigned Flags = ELF::SHF_ALLOC | ELF::SHF_WRITE | ELF::SHF_GROUP;
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const MCSection *Sec = getContext().getELFSection(NameData,
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ELF::SHT_PROGBITS,
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Flags,
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SectionKind::getDataRel(),
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0, Label->getName());
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unsigned Size = TM.getDataLayout()->getPointerSize();
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Streamer.SwitchSection(Sec);
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Streamer.EmitValueToAlignment(TM.getDataLayout()->getPointerABIAlignment());
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Streamer.EmitSymbolAttribute(Label, MCSA_ELF_TypeObject);
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const MCExpr *E = MCConstantExpr::Create(Size, getContext());
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Streamer.EmitELFSize(Label, E);
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Streamer.EmitLabel(Label);
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Streamer.EmitSymbolValue(Sym, Size);
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}
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static SectionKind
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getELFKindForNamedSection(StringRef Name, SectionKind K) {
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// N.B.: The defaults used in here are no the same ones used in MC.
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// We follow gcc, MC follows gas. For example, given ".section .eh_frame",
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// both gas and MC will produce a section with no flags. Given
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// section(".eh_frame") gcc will produce:
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//
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// .section .eh_frame,"a",@progbits
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if (Name.empty() || Name[0] != '.') return K;
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// Some lame default implementation based on some magic section names.
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if (Name == ".bss" ||
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Name.startswith(".bss.") ||
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Name.startswith(".gnu.linkonce.b.") ||
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Name.startswith(".llvm.linkonce.b.") ||
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Name == ".sbss" ||
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Name.startswith(".sbss.") ||
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Name.startswith(".gnu.linkonce.sb.") ||
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Name.startswith(".llvm.linkonce.sb."))
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return SectionKind::getBSS();
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if (Name == ".tdata" ||
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Name.startswith(".tdata.") ||
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Name.startswith(".gnu.linkonce.td.") ||
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Name.startswith(".llvm.linkonce.td."))
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return SectionKind::getThreadData();
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if (Name == ".tbss" ||
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Name.startswith(".tbss.") ||
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Name.startswith(".gnu.linkonce.tb.") ||
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Name.startswith(".llvm.linkonce.tb."))
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return SectionKind::getThreadBSS();
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return K;
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}
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static unsigned getELFSectionType(StringRef Name, SectionKind K) {
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if (Name == ".init_array")
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return ELF::SHT_INIT_ARRAY;
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if (Name == ".fini_array")
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return ELF::SHT_FINI_ARRAY;
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if (Name == ".preinit_array")
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return ELF::SHT_PREINIT_ARRAY;
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if (K.isBSS() || K.isThreadBSS())
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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
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getELFSectionFlags(SectionKind K) {
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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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if (K.isWriteable())
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Flags |= ELF::SHF_WRITE;
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if (K.isThreadLocal())
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Flags |= ELF::SHF_TLS;
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// K.isMergeableConst() is left out to honour PR4650
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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 *TargetLoweringObjectFileELF::
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getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
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Mangler *Mang, 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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Kind = getELFKindForNamedSection(SectionName, Kind);
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return getContext().getELFSection(SectionName,
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getELFSectionType(SectionName, Kind),
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getELFSectionFlags(Kind), Kind);
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}
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/// getSectionPrefixForGlobal - Return the section prefix name used by options
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/// FunctionsSections and DataSections.
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static const char *getSectionPrefixForGlobal(SectionKind Kind) {
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if (Kind.isText()) return ".text.";
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if (Kind.isReadOnly()) return ".rodata.";
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if (Kind.isBSS()) return ".bss.";
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if (Kind.isThreadData()) return ".tdata.";
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if (Kind.isThreadBSS()) return ".tbss.";
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if (Kind.isDataNoRel()) return ".data.";
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if (Kind.isDataRelLocal()) return ".data.rel.local.";
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if (Kind.isDataRel()) return ".data.rel.";
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if (Kind.isReadOnlyWithRelLocal()) return ".data.rel.ro.local.";
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assert(Kind.isReadOnlyWithRel() && "Unknown section kind");
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return ".data.rel.ro.";
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}
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const MCSection *TargetLoweringObjectFileELF::
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SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
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Mangler *Mang, const TargetMachine &TM) const {
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// If we have -ffunction-section or -fdata-section then we should emit the
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// global value to a uniqued section specifically for it.
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bool EmitUniquedSection;
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if (Kind.isText())
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EmitUniquedSection = TM.getFunctionSections();
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else
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EmitUniquedSection = TM.getDataSections();
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// If this global is linkonce/weak and the target handles this by emitting it
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// into a 'uniqued' section name, create and return the section now.
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if ((GV->isWeakForLinker() || EmitUniquedSection) &&
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!Kind.isCommon()) {
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const char *Prefix;
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Prefix = getSectionPrefixForGlobal(Kind);
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SmallString<128> Name(Prefix, Prefix+strlen(Prefix));
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MCSymbol *Sym = Mang->getSymbol(GV);
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Name.append(Sym->getName().begin(), Sym->getName().end());
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StringRef Group = "";
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unsigned Flags = getELFSectionFlags(Kind);
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if (GV->isWeakForLinker()) {
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Group = Sym->getName();
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Flags |= ELF::SHF_GROUP;
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}
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return getContext().getELFSection(Name.str(),
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getELFSectionType(Name.str(), Kind),
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Flags, Kind, 0, Group);
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}
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if (Kind.isText()) return TextSection;
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if (Kind.isMergeable1ByteCString() ||
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Kind.isMergeable2ByteCString() ||
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Kind.isMergeable4ByteCString()) {
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// We also need alignment here.
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// FIXME: this is getting the alignment of the character, not the
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// alignment of the global!
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unsigned Align =
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TM.getDataLayout()->getPreferredAlignment(cast<GlobalVariable>(GV));
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const char *SizeSpec = ".rodata.str1.";
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if (Kind.isMergeable2ByteCString())
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SizeSpec = ".rodata.str2.";
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else if (Kind.isMergeable4ByteCString())
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SizeSpec = ".rodata.str4.";
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else
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assert(Kind.isMergeable1ByteCString() && "unknown string width");
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std::string Name = SizeSpec + utostr(Align);
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return getContext().getELFSection(Name, ELF::SHT_PROGBITS,
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ELF::SHF_ALLOC |
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ELF::SHF_MERGE |
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ELF::SHF_STRINGS,
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Kind);
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}
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if (Kind.isMergeableConst()) {
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if (Kind.isMergeableConst4() && MergeableConst4Section)
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return MergeableConst4Section;
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if (Kind.isMergeableConst8() && MergeableConst8Section)
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return MergeableConst8Section;
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if (Kind.isMergeableConst16() && MergeableConst16Section)
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return MergeableConst16Section;
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return ReadOnlySection; // .const
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}
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if (Kind.isReadOnly()) return ReadOnlySection;
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if (Kind.isThreadData()) return TLSDataSection;
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if (Kind.isThreadBSS()) return TLSBSSSection;
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// Note: we claim that common symbols are put in BSSSection, but they are
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// really emitted with the magic .comm directive, which creates a symbol table
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// entry but not a section.
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if (Kind.isBSS() || Kind.isCommon()) return BSSSection;
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if (Kind.isDataNoRel()) return DataSection;
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if (Kind.isDataRelLocal()) return DataRelLocalSection;
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if (Kind.isDataRel()) return DataRelSection;
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if (Kind.isReadOnlyWithRelLocal()) return DataRelROLocalSection;
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assert(Kind.isReadOnlyWithRel() && "Unknown section kind");
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return DataRelROSection;
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}
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/// getSectionForConstant - Given a mergeable constant with the
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/// specified size and relocation information, return a section that it
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/// should be placed in.
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const MCSection *TargetLoweringObjectFileELF::
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getSectionForConstant(SectionKind Kind) const {
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if (Kind.isMergeableConst4() && MergeableConst4Section)
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return MergeableConst4Section;
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if (Kind.isMergeableConst8() && MergeableConst8Section)
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return MergeableConst8Section;
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if (Kind.isMergeableConst16() && MergeableConst16Section)
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return MergeableConst16Section;
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if (Kind.isReadOnly())
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return ReadOnlySection;
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if (Kind.isReadOnlyWithRelLocal()) return DataRelROLocalSection;
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assert(Kind.isReadOnlyWithRel() && "Unknown section kind");
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return DataRelROSection;
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}
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const MCExpr *TargetLoweringObjectFileELF::
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getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
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MachineModuleInfo *MMI,
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unsigned Encoding, MCStreamer &Streamer) const {
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if (Encoding & dwarf::DW_EH_PE_indirect) {
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MachineModuleInfoELF &ELFMMI = MMI->getObjFileInfo<MachineModuleInfoELF>();
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SmallString<128> Name;
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Mang->getNameWithPrefix(Name, GV, true);
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Name += ".DW.stub";
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// Add information about the stub reference to ELFMMI so that the stub
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// gets emitted by the asmprinter.
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MCSymbol *SSym = getContext().GetOrCreateSymbol(Name.str());
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MachineModuleInfoImpl::StubValueTy &StubSym = ELFMMI.getGVStubEntry(SSym);
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if (StubSym.getPointer() == 0) {
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MCSymbol *Sym = Mang->getSymbol(GV);
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StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage());
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}
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return TargetLoweringObjectFile::
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getExprForDwarfReference(SSym, Encoding & ~dwarf::DW_EH_PE_indirect, Streamer);
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}
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return TargetLoweringObjectFile::
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getExprForDwarfGlobalReference(GV, Mang, MMI, Encoding, Streamer);
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}
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const MCSection *
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TargetLoweringObjectFileELF::getStaticCtorSection(unsigned Priority) const {
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// The default scheme is .ctor / .dtor, so we have to invert the priority
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// numbering.
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if (Priority == 65535)
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return StaticCtorSection;
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if (UseInitArray) {
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std::string Name = std::string(".init_array.") + utostr(Priority);
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return getContext().getELFSection(Name, ELF::SHT_INIT_ARRAY,
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ELF::SHF_ALLOC | ELF::SHF_WRITE,
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SectionKind::getDataRel());
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} else {
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std::string Name = std::string(".ctors.") + utostr(65535 - Priority);
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return getContext().getELFSection(Name, ELF::SHT_PROGBITS,
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ELF::SHF_ALLOC |ELF::SHF_WRITE,
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SectionKind::getDataRel());
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}
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}
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const MCSection *
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TargetLoweringObjectFileELF::getStaticDtorSection(unsigned Priority) const {
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// The default scheme is .ctor / .dtor, so we have to invert the priority
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// numbering.
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if (Priority == 65535)
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return StaticDtorSection;
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if (UseInitArray) {
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std::string Name = std::string(".fini_array.") + utostr(Priority);
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return getContext().getELFSection(Name, ELF::SHT_FINI_ARRAY,
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ELF::SHF_ALLOC | ELF::SHF_WRITE,
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SectionKind::getDataRel());
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} else {
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std::string Name = std::string(".dtors.") + utostr(65535 - Priority);
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return getContext().getELFSection(Name, ELF::SHT_PROGBITS,
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ELF::SHF_ALLOC |ELF::SHF_WRITE,
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SectionKind::getDataRel());
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}
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}
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void
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TargetLoweringObjectFileELF::InitializeELF(bool UseInitArray_) {
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UseInitArray = UseInitArray_;
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if (!UseInitArray)
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return;
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StaticCtorSection =
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getContext().getELFSection(".init_array", ELF::SHT_INIT_ARRAY,
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ELF::SHF_WRITE |
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ELF::SHF_ALLOC,
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SectionKind::getDataRel());
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StaticDtorSection =
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getContext().getELFSection(".fini_array", ELF::SHT_FINI_ARRAY,
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ELF::SHF_WRITE |
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ELF::SHF_ALLOC,
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SectionKind::getDataRel());
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}
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//===----------------------------------------------------------------------===//
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// MachO
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//===----------------------------------------------------------------------===//
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/// emitModuleFlags - Emit the module flags that specify the garbage collection
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/// information.
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void TargetLoweringObjectFileMachO::
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emitModuleFlags(MCStreamer &Streamer,
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ArrayRef<Module::ModuleFlagEntry> ModuleFlags,
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Mangler *Mang, const TargetMachine &TM) const {
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unsigned VersionVal = 0;
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unsigned ImageInfoFlags = 0;
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StringRef SectionVal;
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for (ArrayRef<Module::ModuleFlagEntry>::iterator
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i = ModuleFlags.begin(), e = ModuleFlags.end(); i != e; ++i) {
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const Module::ModuleFlagEntry &MFE = *i;
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// Ignore flags with 'Require' behavior.
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if (MFE.Behavior == Module::Require)
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continue;
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StringRef Key = MFE.Key->getString();
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Value *Val = MFE.Val;
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if (Key == "Objective-C Image Info Version")
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VersionVal = cast<ConstantInt>(Val)->getZExtValue();
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else if (Key == "Objective-C Garbage Collection" ||
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Key == "Objective-C GC Only" ||
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Key == "Objective-C Is Simulated")
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ImageInfoFlags |= cast<ConstantInt>(Val)->getZExtValue();
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else if (Key == "Objective-C Image Info Section")
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SectionVal = cast<MDString>(Val)->getString();
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}
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// The section is mandatory. If we don't have it, then we don't have GC info.
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if (SectionVal.empty()) return;
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StringRef Segment, Section;
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unsigned TAA = 0, StubSize = 0;
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bool TAAParsed;
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std::string ErrorCode =
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MCSectionMachO::ParseSectionSpecifier(SectionVal, Segment, Section,
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TAA, TAAParsed, StubSize);
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if (!ErrorCode.empty())
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// If invalid, report the error with report_fatal_error.
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report_fatal_error("Invalid section specifier '" + Section + "': " +
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ErrorCode + ".");
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// Get the section.
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const MCSectionMachO *S =
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getContext().getMachOSection(Segment, Section, TAA, StubSize,
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SectionKind::getDataNoRel());
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Streamer.SwitchSection(S);
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Streamer.EmitLabel(getContext().
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GetOrCreateSymbol(StringRef("L_OBJC_IMAGE_INFO")));
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Streamer.EmitIntValue(VersionVal, 4);
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Streamer.EmitIntValue(ImageInfoFlags, 4);
|
|
Streamer.AddBlankLine();
|
|
}
|
|
|
|
const MCSection *TargetLoweringObjectFileMachO::
|
|
getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
|
|
Mangler *Mang, const TargetMachine &TM) const {
|
|
// Parse the section specifier and create it if valid.
|
|
StringRef Segment, Section;
|
|
unsigned TAA = 0, StubSize = 0;
|
|
bool TAAParsed;
|
|
std::string ErrorCode =
|
|
MCSectionMachO::ParseSectionSpecifier(GV->getSection(), Segment, Section,
|
|
TAA, TAAParsed, StubSize);
|
|
if (!ErrorCode.empty()) {
|
|
// If invalid, report the error with report_fatal_error.
|
|
report_fatal_error("Global variable '" + GV->getName() +
|
|
"' has an invalid section specifier '" +
|
|
GV->getSection() + "': " + ErrorCode + ".");
|
|
}
|
|
|
|
// Get the section.
|
|
const MCSectionMachO *S =
|
|
getContext().getMachOSection(Segment, Section, TAA, StubSize, Kind);
|
|
|
|
// If TAA wasn't set by ParseSectionSpecifier() above,
|
|
// use the value returned by getMachOSection() as a default.
|
|
if (!TAAParsed)
|
|
TAA = S->getTypeAndAttributes();
|
|
|
|
// Okay, now that we got the section, verify that the TAA & StubSize agree.
|
|
// If the user declared multiple globals with different section flags, we need
|
|
// to reject it here.
|
|
if (S->getTypeAndAttributes() != TAA || S->getStubSize() != StubSize) {
|
|
// If invalid, report the error with report_fatal_error.
|
|
report_fatal_error("Global variable '" + GV->getName() +
|
|
"' section type or attributes does not match previous"
|
|
" section specifier");
|
|
}
|
|
|
|
return S;
|
|
}
|
|
|
|
const MCSection *TargetLoweringObjectFileMachO::
|
|
SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
|
|
Mangler *Mang, const TargetMachine &TM) const {
|
|
|
|
// Handle thread local data.
|
|
if (Kind.isThreadBSS()) return TLSBSSSection;
|
|
if (Kind.isThreadData()) return TLSDataSection;
|
|
|
|
if (Kind.isText())
|
|
return GV->isWeakForLinker() ? TextCoalSection : TextSection;
|
|
|
|
// If this is weak/linkonce, put this in a coalescable section, either in text
|
|
// or data depending on if it is writable.
|
|
if (GV->isWeakForLinker()) {
|
|
if (Kind.isReadOnly())
|
|
return ConstTextCoalSection;
|
|
return DataCoalSection;
|
|
}
|
|
|
|
// FIXME: Alignment check should be handled by section classifier.
|
|
if (Kind.isMergeable1ByteCString() &&
|
|
TM.getDataLayout()->getPreferredAlignment(cast<GlobalVariable>(GV)) < 32)
|
|
return CStringSection;
|
|
|
|
// Do not put 16-bit arrays in the UString section if they have an
|
|
// externally visible label, this runs into issues with certain linker
|
|
// versions.
|
|
if (Kind.isMergeable2ByteCString() && !GV->hasExternalLinkage() &&
|
|
TM.getDataLayout()->getPreferredAlignment(cast<GlobalVariable>(GV)) < 32)
|
|
return UStringSection;
|
|
|
|
if (Kind.isMergeableConst()) {
|
|
if (Kind.isMergeableConst4())
|
|
return FourByteConstantSection;
|
|
if (Kind.isMergeableConst8())
|
|
return EightByteConstantSection;
|
|
if (Kind.isMergeableConst16() && SixteenByteConstantSection)
|
|
return SixteenByteConstantSection;
|
|
}
|
|
|
|
// Otherwise, if it is readonly, but not something we can specially optimize,
|
|
// just drop it in .const.
|
|
if (Kind.isReadOnly())
|
|
return ReadOnlySection;
|
|
|
|
// If this is marked const, put it into a const section. But if the dynamic
|
|
// linker needs to write to it, put it in the data segment.
|
|
if (Kind.isReadOnlyWithRel())
|
|
return ConstDataSection;
|
|
|
|
// Put zero initialized globals with strong external linkage in the
|
|
// DATA, __common section with the .zerofill directive.
|
|
if (Kind.isBSSExtern())
|
|
return DataCommonSection;
|
|
|
|
// Put zero initialized globals with local linkage in __DATA,__bss directive
|
|
// with the .zerofill directive (aka .lcomm).
|
|
if (Kind.isBSSLocal())
|
|
return DataBSSSection;
|
|
|
|
// Otherwise, just drop the variable in the normal data section.
|
|
return DataSection;
|
|
}
|
|
|
|
const MCSection *
|
|
TargetLoweringObjectFileMachO::getSectionForConstant(SectionKind Kind) const {
|
|
// If this constant requires a relocation, we have to put it in the data
|
|
// segment, not in the text segment.
|
|
if (Kind.isDataRel() || Kind.isReadOnlyWithRel())
|
|
return ConstDataSection;
|
|
|
|
if (Kind.isMergeableConst4())
|
|
return FourByteConstantSection;
|
|
if (Kind.isMergeableConst8())
|
|
return EightByteConstantSection;
|
|
if (Kind.isMergeableConst16() && SixteenByteConstantSection)
|
|
return SixteenByteConstantSection;
|
|
return ReadOnlySection; // .const
|
|
}
|
|
|
|
/// shouldEmitUsedDirectiveFor - This hook allows targets to selectively decide
|
|
/// not to emit the UsedDirective for some symbols in llvm.used.
|
|
// FIXME: REMOVE this (rdar://7071300)
|
|
bool TargetLoweringObjectFileMachO::
|
|
shouldEmitUsedDirectiveFor(const GlobalValue *GV, Mangler *Mang) const {
|
|
/// On Darwin, internally linked data beginning with "L" or "l" does not have
|
|
/// the directive emitted (this occurs in ObjC metadata).
|
|
if (!GV) return false;
|
|
|
|
// Check whether the mangled name has the "Private" or "LinkerPrivate" prefix.
|
|
if (GV->hasLocalLinkage() && !isa<Function>(GV)) {
|
|
// FIXME: ObjC metadata is currently emitted as internal symbols that have
|
|
// \1L and \0l prefixes on them. Fix them to be Private/LinkerPrivate and
|
|
// this horrible hack can go away.
|
|
MCSymbol *Sym = Mang->getSymbol(GV);
|
|
if (Sym->getName()[0] == 'L' || Sym->getName()[0] == 'l')
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
const MCExpr *TargetLoweringObjectFileMachO::
|
|
getExprForDwarfGlobalReference(const GlobalValue *GV, Mangler *Mang,
|
|
MachineModuleInfo *MMI, unsigned Encoding,
|
|
MCStreamer &Streamer) const {
|
|
// The mach-o version of this method defaults to returning a stub reference.
|
|
|
|
if (Encoding & DW_EH_PE_indirect) {
|
|
MachineModuleInfoMachO &MachOMMI =
|
|
MMI->getObjFileInfo<MachineModuleInfoMachO>();
|
|
|
|
SmallString<128> Name;
|
|
Mang->getNameWithPrefix(Name, GV, true);
|
|
Name += "$non_lazy_ptr";
|
|
|
|
// Add information about the stub reference to MachOMMI so that the stub
|
|
// gets emitted by the asmprinter.
|
|
MCSymbol *SSym = getContext().GetOrCreateSymbol(Name.str());
|
|
MachineModuleInfoImpl::StubValueTy &StubSym =
|
|
GV->hasHiddenVisibility() ? MachOMMI.getHiddenGVStubEntry(SSym) :
|
|
MachOMMI.getGVStubEntry(SSym);
|
|
if (StubSym.getPointer() == 0) {
|
|
MCSymbol *Sym = Mang->getSymbol(GV);
|
|
StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage());
|
|
}
|
|
|
|
return TargetLoweringObjectFile::
|
|
getExprForDwarfReference(SSym, Encoding & ~dwarf::DW_EH_PE_indirect, Streamer);
|
|
}
|
|
|
|
return TargetLoweringObjectFile::
|
|
getExprForDwarfGlobalReference(GV, Mang, MMI, Encoding, Streamer);
|
|
}
|
|
|
|
MCSymbol *TargetLoweringObjectFileMachO::
|
|
getCFIPersonalitySymbol(const GlobalValue *GV, Mangler *Mang,
|
|
MachineModuleInfo *MMI) const {
|
|
// The mach-o version of this method defaults to returning a stub reference.
|
|
MachineModuleInfoMachO &MachOMMI =
|
|
MMI->getObjFileInfo<MachineModuleInfoMachO>();
|
|
|
|
SmallString<128> Name;
|
|
Mang->getNameWithPrefix(Name, GV, true);
|
|
Name += "$non_lazy_ptr";
|
|
|
|
// Add information about the stub reference to MachOMMI so that the stub
|
|
// gets emitted by the asmprinter.
|
|
MCSymbol *SSym = getContext().GetOrCreateSymbol(Name.str());
|
|
MachineModuleInfoImpl::StubValueTy &StubSym = MachOMMI.getGVStubEntry(SSym);
|
|
if (StubSym.getPointer() == 0) {
|
|
MCSymbol *Sym = Mang->getSymbol(GV);
|
|
StubSym = MachineModuleInfoImpl::StubValueTy(Sym, !GV->hasLocalLinkage());
|
|
}
|
|
|
|
return SSym;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// COFF
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
static unsigned
|
|
getCOFFSectionFlags(SectionKind K) {
|
|
unsigned Flags = 0;
|
|
|
|
if (K.isMetadata())
|
|
Flags |=
|
|
COFF::IMAGE_SCN_MEM_DISCARDABLE;
|
|
else if (K.isText())
|
|
Flags |=
|
|
COFF::IMAGE_SCN_MEM_EXECUTE |
|
|
COFF::IMAGE_SCN_MEM_READ |
|
|
COFF::IMAGE_SCN_CNT_CODE;
|
|
else if (K.isBSS ())
|
|
Flags |=
|
|
COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ |
|
|
COFF::IMAGE_SCN_MEM_WRITE;
|
|
else if (K.isThreadLocal())
|
|
Flags |=
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ |
|
|
COFF::IMAGE_SCN_MEM_WRITE;
|
|
else if (K.isReadOnly())
|
|
Flags |=
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ;
|
|
else if (K.isWriteable())
|
|
Flags |=
|
|
COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
|
|
COFF::IMAGE_SCN_MEM_READ |
|
|
COFF::IMAGE_SCN_MEM_WRITE;
|
|
|
|
return Flags;
|
|
}
|
|
|
|
const MCSection *TargetLoweringObjectFileCOFF::
|
|
getExplicitSectionGlobal(const GlobalValue *GV, SectionKind Kind,
|
|
Mangler *Mang, const TargetMachine &TM) const {
|
|
return getContext().getCOFFSection(GV->getSection(),
|
|
getCOFFSectionFlags(Kind),
|
|
Kind);
|
|
}
|
|
|
|
static const char *getCOFFSectionPrefixForUniqueGlobal(SectionKind Kind) {
|
|
if (Kind.isText())
|
|
return ".text$";
|
|
if (Kind.isBSS ())
|
|
return ".bss$";
|
|
if (Kind.isThreadLocal())
|
|
return ".tls$";
|
|
if (Kind.isWriteable())
|
|
return ".data$";
|
|
return ".rdata$";
|
|
}
|
|
|
|
|
|
const MCSection *TargetLoweringObjectFileCOFF::
|
|
SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
|
|
Mangler *Mang, const TargetMachine &TM) const {
|
|
|
|
// If this global is linkonce/weak and the target handles this by emitting it
|
|
// into a 'uniqued' section name, create and return the section now.
|
|
if (GV->isWeakForLinker()) {
|
|
const char *Prefix = getCOFFSectionPrefixForUniqueGlobal(Kind);
|
|
SmallString<128> Name(Prefix, Prefix+strlen(Prefix));
|
|
MCSymbol *Sym = Mang->getSymbol(GV);
|
|
Name.append(Sym->getName().begin() + 1, Sym->getName().end());
|
|
|
|
unsigned Characteristics = getCOFFSectionFlags(Kind);
|
|
|
|
Characteristics |= COFF::IMAGE_SCN_LNK_COMDAT;
|
|
|
|
return getContext().getCOFFSection(Name.str(), Characteristics,
|
|
COFF::IMAGE_COMDAT_SELECT_ANY, Kind);
|
|
}
|
|
|
|
if (Kind.isText())
|
|
return getTextSection();
|
|
|
|
if (Kind.isThreadLocal())
|
|
return getTLSDataSection();
|
|
|
|
return getDataSection();
|
|
}
|
|
|