-//===- lib/MC/MCELFStreamer.cpp - ELF Object Output ------------===//
+//===- lib/MC/MCELFStreamer.cpp - ELF Object Output -----------------------===//
//
// The LLVM Compiler Infrastructure
//
//
//===----------------------------------------------------------------------===//
-#include "llvm/MC/MCStreamer.h"
-
+#include "llvm/MC/MCELFStreamer.h"
+#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/MC/MCAsmBackend.h"
+#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCAssembler.h"
-#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCCodeEmitter.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCELF.h"
#include "llvm/MC/MCELFSymbolFlags.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCObjectStreamer.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/Support/ELF.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
-#include "llvm/Target/TargetAsmBackend.h"
-#include "llvm/Target/TargetAsmInfo.h"
using namespace llvm;
-namespace {
-
-static void SetBinding(MCSymbolData &SD, unsigned Binding) {
- assert(Binding == ELF::STB_LOCAL || Binding == ELF::STB_GLOBAL ||
- Binding == ELF::STB_WEAK);
- uint32_t OtherFlags = SD.getFlags() & ~(0xf << ELF_STB_Shift);
- SD.setFlags(OtherFlags | (Binding << ELF_STB_Shift));
+MCELFStreamer::~MCELFStreamer() {
}
-static unsigned GetBinding(const MCSymbolData &SD) {
- uint32_t Binding = (SD.getFlags() & (0xf << ELF_STB_Shift)) >> ELF_STB_Shift;
- assert(Binding == ELF::STB_LOCAL || Binding == ELF::STB_GLOBAL ||
- Binding == ELF::STB_WEAK);
- return Binding;
-}
-
-static void SetType(MCSymbolData &SD, unsigned Type) {
- assert(Type == ELF::STT_NOTYPE || Type == ELF::STT_OBJECT ||
- Type == ELF::STT_FUNC || Type == ELF::STT_SECTION ||
- Type == ELF::STT_FILE || Type == ELF::STT_COMMON ||
- Type == ELF::STT_TLS);
-
- uint32_t OtherFlags = SD.getFlags() & ~(0xf << ELF_STT_Shift);
- SD.setFlags(OtherFlags | (Type << ELF_STT_Shift));
-}
-
-static void SetVisibility(MCSymbolData &SD, unsigned Visibility) {
- assert(Visibility == ELF::STV_DEFAULT || Visibility == ELF::STV_INTERNAL ||
- Visibility == ELF::STV_HIDDEN || Visibility == ELF::STV_PROTECTED);
-
- uint32_t OtherFlags = SD.getFlags() & ~(0xf << ELF_STV_Shift);
- SD.setFlags(OtherFlags | (Visibility << ELF_STV_Shift));
-}
-
-class MCELFStreamer : public MCObjectStreamer {
-public:
- MCELFStreamer(MCContext &Context, TargetAsmBackend &TAB,
- raw_ostream &OS, MCCodeEmitter *Emitter)
- : MCObjectStreamer(Context, TAB, OS, Emitter) {}
-
- ~MCELFStreamer() {}
-
- /// @name MCStreamer Interface
- /// @{
-
- virtual void InitSections();
- virtual void EmitLabel(MCSymbol *Symbol);
- virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
- virtual void EmitThumbFunc(MCSymbol *Func);
- virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
- virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
- virtual void SwitchSection(const MCSection *Section);
- virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
- virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
- assert(0 && "ELF doesn't support this directive");
- }
- virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
- unsigned ByteAlignment);
- virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol) {
- assert(0 && "ELF doesn't support this directive");
- }
-
- virtual void EmitCOFFSymbolStorageClass(int StorageClass) {
- assert(0 && "ELF doesn't support this directive");
- }
-
- virtual void EmitCOFFSymbolType(int Type) {
- assert(0 && "ELF doesn't support this directive");
- }
-
- virtual void EndCOFFSymbolDef() {
- assert(0 && "ELF doesn't support this directive");
- }
-
- virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
- MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
- SD.setSize(Value);
- }
-
- virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size);
+void MCELFStreamer::InitSections(bool NoExecStack) {
+ // This emulates the same behavior of GNU as. This makes it easier
+ // to compare the output as the major sections are in the same order.
+ MCContext &Ctx = getContext();
+ SwitchSection(Ctx.getObjectFileInfo()->getTextSection());
+ EmitCodeAlignment(4);
- virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
- unsigned Size = 0, unsigned ByteAlignment = 0) {
- assert(0 && "ELF doesn't support this directive");
- }
- virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
- uint64_t Size, unsigned ByteAlignment = 0) {
- assert(0 && "ELF doesn't support this directive");
- }
- virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
- virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
- unsigned ValueSize = 1,
- unsigned MaxBytesToEmit = 0);
- virtual void EmitCodeAlignment(unsigned ByteAlignment,
- unsigned MaxBytesToEmit = 0);
-
- virtual void EmitFileDirective(StringRef Filename);
-
- virtual void Finish();
-
-private:
- virtual void EmitInstToFragment(const MCInst &Inst);
- virtual void EmitInstToData(const MCInst &Inst);
-
- void fixSymbolsInTLSFixups(const MCExpr *expr);
-
- struct LocalCommon {
- MCSymbolData *SD;
- uint64_t Size;
- unsigned ByteAlignment;
- };
- std::vector<LocalCommon> LocalCommons;
-
- SmallPtrSet<MCSymbol *, 16> BindingExplicitlySet;
- /// @}
- void SetSection(StringRef Section, unsigned Type, unsigned Flags,
- SectionKind Kind) {
- SwitchSection(getContext().getELFSection(Section, Type, Flags, Kind));
- }
+ SwitchSection(Ctx.getObjectFileInfo()->getDataSection());
+ EmitCodeAlignment(4);
- void SetSectionData() {
- SetSection(".data", ELF::SHT_PROGBITS,
- ELF::SHF_WRITE |ELF::SHF_ALLOC,
- SectionKind::getDataRel());
- EmitCodeAlignment(4, 0);
- }
- void SetSectionText() {
- SetSection(".text", ELF::SHT_PROGBITS,
- ELF::SHF_EXECINSTR |
- ELF::SHF_ALLOC, SectionKind::getText());
- EmitCodeAlignment(4, 0);
- }
- void SetSectionBss() {
- SetSection(".bss", ELF::SHT_NOBITS,
- ELF::SHF_WRITE |
- ELF::SHF_ALLOC, SectionKind::getBSS());
- EmitCodeAlignment(4, 0);
- }
-};
+ SwitchSection(Ctx.getObjectFileInfo()->getBSSSection());
+ EmitCodeAlignment(4);
-} // end anonymous namespace.
+ SwitchSection(Ctx.getObjectFileInfo()->getTextSection());
-void MCELFStreamer::InitSections() {
- // This emulates the same behavior of GNU as. This makes it easier
- // to compare the output as the major sections are in the same order.
- SetSectionText();
- SetSectionData();
- SetSectionBss();
- SetSectionText();
+ if (NoExecStack)
+ SwitchSection(Ctx.getAsmInfo()->getNonexecutableStackSection(Ctx));
}
void MCELFStreamer::EmitLabel(MCSymbol *Symbol) {
static_cast<const MCSectionELF&>(Symbol->getSection());
MCSymbolData &SD = getAssembler().getSymbolData(*Symbol);
if (Section.getFlags() & ELF::SHF_TLS)
- SetType(SD, ELF::STT_TLS);
+ MCELF::SetType(SD, ELF::STT_TLS);
}
void MCELFStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
+ // Let the target do whatever target specific stuff it needs to do.
+ getAssembler().getBackend().handleAssemblerFlag(Flag);
+ // Do any generic stuff we need to do.
switch (Flag) {
case MCAF_SyntaxUnified: return; // no-op here.
- case MCAF_Code16: return; // no-op here.
- case MCAF_Code32: return; // no-op here.
+ case MCAF_Code16: return; // Change parsing mode; no-op here.
+ case MCAF_Code32: return; // Change parsing mode; no-op here.
+ case MCAF_Code64: return; // Change parsing mode; no-op here.
case MCAF_SubsectionsViaSymbols:
getAssembler().setSubsectionsViaSymbols(true);
return;
}
- assert(0 && "invalid assembler flag!");
+ llvm_unreachable("invalid assembler flag!");
}
-void MCELFStreamer::EmitThumbFunc(MCSymbol *Func) {
- // FIXME: Anything needed here to flag the function as thumb?
-}
+void MCELFStreamer::ChangeSection(const MCSection *Section,
+ const MCExpr *Subsection) {
+ MCSectionData *CurSection = getCurrentSectionData();
+ if (CurSection && CurSection->isBundleLocked())
+ report_fatal_error("Unterminated .bundle_lock when changing a section");
-void MCELFStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
- // TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
- // MCObjectStreamer.
- // FIXME: Lift context changes into super class.
- getAssembler().getOrCreateSymbolData(*Symbol);
- Symbol->setVariableValue(AddValueSymbols(Value));
-}
-
-void MCELFStreamer::SwitchSection(const MCSection *Section) {
- const MCSymbol *Grp = static_cast<const MCSectionELF *>(Section)->getGroup();
+ MCAssembler &Asm = getAssembler();
+ auto *SectionELF = static_cast<const MCSectionELF *>(Section);
+ const MCSymbol *Grp = SectionELF->getGroup();
if (Grp)
- getAssembler().getOrCreateSymbolData(*Grp);
- this->MCObjectStreamer::SwitchSection(Section);
+ Asm.getOrCreateSymbolData(*Grp);
+
+ this->MCObjectStreamer::ChangeSection(Section, Subsection);
+ MCSymbol *SectionSymbol = getContext().getOrCreateSectionSymbol(*SectionELF);
+ if (SectionSymbol->isUndefined()) {
+ EmitLabel(SectionSymbol);
+ MCELF::SetType(Asm.getSymbolData(*SectionSymbol), ELF::STT_SECTION);
+ }
}
void MCELFStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
getAssembler().getOrCreateSymbolData(*Symbol);
- MCSymbolData &AliasSD = getAssembler().getOrCreateSymbolData(*Alias);
- AliasSD.setFlags(AliasSD.getFlags() | ELF_Other_Weakref);
- const MCExpr *Value = MCSymbolRefExpr::Create(Symbol, getContext());
+ const MCExpr *Value = MCSymbolRefExpr::Create(
+ Symbol, MCSymbolRefExpr::VK_WEAKREF, getContext());
Alias->setVariableValue(Value);
}
-void MCELFStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
- MCSymbolAttr Attribute) {
+// When GNU as encounters more than one .type declaration for an object it seems
+// to use a mechanism similar to the one below to decide which type is actually
+// used in the object file. The greater of T1 and T2 is selected based on the
+// following ordering:
+// STT_NOTYPE < STT_OBJECT < STT_FUNC < STT_GNU_IFUNC < STT_TLS < anything else
+// If neither T1 < T2 nor T2 < T1 according to this ordering, use T2 (the user
+// provided type).
+static unsigned CombineSymbolTypes(unsigned T1, unsigned T2) {
+ unsigned TypeOrdering[] = {ELF::STT_NOTYPE, ELF::STT_OBJECT, ELF::STT_FUNC,
+ ELF::STT_GNU_IFUNC, ELF::STT_TLS};
+ for (unsigned i = 0; i != array_lengthof(TypeOrdering); ++i) {
+ if (T1 == TypeOrdering[i])
+ return T2;
+ if (T2 == TypeOrdering[i])
+ return T1;
+ }
+
+ return T2;
+}
+
+bool MCELFStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
+ MCSymbolAttr Attribute) {
// Indirect symbols are handled differently, to match how 'as' handles
// them. This makes writing matching .o files easier.
if (Attribute == MCSA_IndirectSymbol) {
ISD.Symbol = Symbol;
ISD.SectionData = getCurrentSectionData();
getAssembler().getIndirectSymbols().push_back(ISD);
- return;
+ return true;
}
// Adding a symbol attribute always introduces the symbol, note that an
switch (Attribute) {
case MCSA_LazyReference:
case MCSA_Reference:
- case MCSA_NoDeadStrip:
case MCSA_SymbolResolver:
case MCSA_PrivateExtern:
case MCSA_WeakDefinition:
case MCSA_WeakDefAutoPrivate:
case MCSA_Invalid:
- case MCSA_ELF_TypeIndFunction:
case MCSA_IndirectSymbol:
- assert(0 && "Invalid symbol attribute for ELF!");
- break;
+ return false;
+ case MCSA_NoDeadStrip:
case MCSA_ELF_TypeGnuUniqueObject:
// Ignore for now.
break;
case MCSA_Global:
- SetBinding(SD, ELF::STB_GLOBAL);
+ MCELF::SetBinding(SD, ELF::STB_GLOBAL);
SD.setExternal(true);
BindingExplicitlySet.insert(Symbol);
break;
case MCSA_WeakReference:
case MCSA_Weak:
- SetBinding(SD, ELF::STB_WEAK);
+ MCELF::SetBinding(SD, ELF::STB_WEAK);
SD.setExternal(true);
BindingExplicitlySet.insert(Symbol);
break;
case MCSA_Local:
- SetBinding(SD, ELF::STB_LOCAL);
+ MCELF::SetBinding(SD, ELF::STB_LOCAL);
SD.setExternal(false);
BindingExplicitlySet.insert(Symbol);
break;
case MCSA_ELF_TypeFunction:
- SetType(SD, ELF::STT_FUNC);
+ MCELF::SetType(SD, CombineSymbolTypes(MCELF::GetType(SD),
+ ELF::STT_FUNC));
+ break;
+
+ case MCSA_ELF_TypeIndFunction:
+ MCELF::SetType(SD, CombineSymbolTypes(MCELF::GetType(SD),
+ ELF::STT_GNU_IFUNC));
break;
case MCSA_ELF_TypeObject:
- SetType(SD, ELF::STT_OBJECT);
+ MCELF::SetType(SD, CombineSymbolTypes(MCELF::GetType(SD),
+ ELF::STT_OBJECT));
break;
case MCSA_ELF_TypeTLS:
- SetType(SD, ELF::STT_TLS);
+ MCELF::SetType(SD, CombineSymbolTypes(MCELF::GetType(SD),
+ ELF::STT_TLS));
break;
case MCSA_ELF_TypeCommon:
- SetType(SD, ELF::STT_COMMON);
+ // TODO: Emit these as a common symbol.
+ MCELF::SetType(SD, CombineSymbolTypes(MCELF::GetType(SD),
+ ELF::STT_OBJECT));
break;
case MCSA_ELF_TypeNoType:
- SetType(SD, ELF::STT_NOTYPE);
+ MCELF::SetType(SD, CombineSymbolTypes(MCELF::GetType(SD),
+ ELF::STT_NOTYPE));
break;
case MCSA_Protected:
- SetVisibility(SD, ELF::STV_PROTECTED);
+ MCELF::SetVisibility(SD, ELF::STV_PROTECTED);
break;
case MCSA_Hidden:
- SetVisibility(SD, ELF::STV_HIDDEN);
+ MCELF::SetVisibility(SD, ELF::STV_HIDDEN);
break;
case MCSA_Internal:
- SetVisibility(SD, ELF::STV_INTERNAL);
+ MCELF::SetVisibility(SD, ELF::STV_INTERNAL);
break;
}
+
+ return true;
}
void MCELFStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
if (!BindingExplicitlySet.count(Symbol)) {
- SetBinding(SD, ELF::STB_GLOBAL);
+ MCELF::SetBinding(SD, ELF::STB_GLOBAL);
SD.setExternal(true);
}
- SetType(SD, ELF::STT_OBJECT);
+ MCELF::SetType(SD, ELF::STT_OBJECT);
- if (GetBinding(SD) == ELF_STB_Local) {
+ if (MCELF::GetBinding(SD) == ELF_STB_Local) {
const MCSection *Section = getAssembler().getContext().getELFSection(".bss",
- ELF::SHT_NOBITS,
- ELF::SHF_WRITE |
- ELF::SHF_ALLOC,
- SectionKind::getBSS());
- Symbol->setSection(*Section);
+ ELF::SHT_NOBITS,
+ ELF::SHF_WRITE |
+ ELF::SHF_ALLOC,
+ SectionKind::getBSS());
+
+ AssignSection(Symbol, Section);
struct LocalCommon L = {&SD, Size, ByteAlignment};
LocalCommons.push_back(L);
SD.setSize(MCConstantExpr::Create(Size, getContext()));
}
-void MCELFStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {
+void MCELFStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
+ MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
+ SD.setSize(Value);
+}
+
+void MCELFStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+ unsigned ByteAlignment) {
// FIXME: Should this be caught and done earlier?
MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
- SetBinding(SD, ELF::STB_LOCAL);
+ MCELF::SetBinding(SD, ELF::STB_LOCAL);
SD.setExternal(false);
BindingExplicitlySet.insert(Symbol);
- // FIXME: ByteAlignment is not needed here, but is required.
- EmitCommonSymbol(Symbol, Size, 1);
+ EmitCommonSymbol(Symbol, Size, ByteAlignment);
}
-void MCELFStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
- // TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
- // MCObjectStreamer.
- getOrCreateDataFragment()->getContents().append(Data.begin(), Data.end());
+void MCELFStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
+ const SMLoc &Loc) {
+ if (getCurrentSectionData()->isBundleLocked())
+ report_fatal_error("Emitting values inside a locked bundle is forbidden");
+ fixSymbolsInTLSFixups(Value);
+ MCObjectStreamer::EmitValueImpl(Value, Size, Loc);
}
void MCELFStreamer::EmitValueToAlignment(unsigned ByteAlignment,
- int64_t Value, unsigned ValueSize,
- unsigned MaxBytesToEmit) {
- // TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
- // MCObjectStreamer.
- if (MaxBytesToEmit == 0)
- MaxBytesToEmit = ByteAlignment;
- new MCAlignFragment(ByteAlignment, Value, ValueSize, MaxBytesToEmit,
- getCurrentSectionData());
-
- // Update the maximum alignment on the current section if necessary.
- if (ByteAlignment > getCurrentSectionData()->getAlignment())
- getCurrentSectionData()->setAlignment(ByteAlignment);
-}
-
-void MCELFStreamer::EmitCodeAlignment(unsigned ByteAlignment,
- unsigned MaxBytesToEmit) {
- // TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
- // MCObjectStreamer.
- if (MaxBytesToEmit == 0)
- MaxBytesToEmit = ByteAlignment;
- MCAlignFragment *F = new MCAlignFragment(ByteAlignment, 0, 1, MaxBytesToEmit,
- getCurrentSectionData());
- F->setEmitNops(true);
-
- // Update the maximum alignment on the current section if necessary.
- if (ByteAlignment > getCurrentSectionData()->getAlignment())
- getCurrentSectionData()->setAlignment(ByteAlignment);
-}
-
-// Add a symbol for the file name of this module. This is the second
-// entry in the module's symbol table (the first being the null symbol).
-void MCELFStreamer::EmitFileDirective(StringRef Filename) {
- MCSymbol *Symbol = getAssembler().getContext().GetOrCreateSymbol(Filename);
- Symbol->setSection(*CurSection);
- Symbol->setAbsolute();
+ int64_t Value,
+ unsigned ValueSize,
+ unsigned MaxBytesToEmit) {
+ if (getCurrentSectionData()->isBundleLocked())
+ report_fatal_error("Emitting values inside a locked bundle is forbidden");
+ MCObjectStreamer::EmitValueToAlignment(ByteAlignment, Value,
+ ValueSize, MaxBytesToEmit);
+}
- MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
+// Add a symbol for the file name of this module. They start after the
+// null symbol and don't count as normal symbol, i.e. a non-STT_FILE symbol
+// with the same name may appear.
+void MCELFStreamer::EmitFileDirective(StringRef Filename) {
+ getAssembler().addFileName(Filename);
+}
- SD.setFlags(ELF_STT_File | ELF_STB_Local | ELF_STV_Default);
+void MCELFStreamer::EmitIdent(StringRef IdentString) {
+ const MCSection *Comment = getAssembler().getContext().getELFSection(
+ ".comment", ELF::SHT_PROGBITS, ELF::SHF_MERGE | ELF::SHF_STRINGS,
+ SectionKind::getReadOnly(), 1, "");
+ PushSection();
+ SwitchSection(Comment);
+ if (!SeenIdent) {
+ EmitIntValue(0, 1);
+ SeenIdent = true;
+ }
+ EmitBytes(IdentString);
+ EmitIntValue(0, 1);
+ PopSection();
}
-void MCELFStreamer::fixSymbolsInTLSFixups(const MCExpr *expr) {
+void MCELFStreamer::fixSymbolsInTLSFixups(const MCExpr *expr) {
switch (expr->getKind()) {
- case MCExpr::Target: llvm_unreachable("Can't handle target exprs yet!");
+ case MCExpr::Target:
+ cast<MCTargetExpr>(expr)->fixELFSymbolsInTLSFixups(getAssembler());
+ break;
case MCExpr::Constant:
break;
switch (symRef.getKind()) {
default:
return;
+ case MCSymbolRefExpr::VK_GOTTPOFF:
+ case MCSymbolRefExpr::VK_INDNTPOFF:
case MCSymbolRefExpr::VK_NTPOFF:
case MCSymbolRefExpr::VK_GOTNTPOFF:
case MCSymbolRefExpr::VK_TLSGD:
+ case MCSymbolRefExpr::VK_TLSLD:
case MCSymbolRefExpr::VK_TLSLDM:
case MCSymbolRefExpr::VK_TPOFF:
case MCSymbolRefExpr::VK_DTPOFF:
- case MCSymbolRefExpr::VK_GOTTPOFF:
- case MCSymbolRefExpr::VK_TLSLD:
- case MCSymbolRefExpr::VK_ARM_TLSGD:
+ case MCSymbolRefExpr::VK_Mips_TLSGD:
+ case MCSymbolRefExpr::VK_Mips_GOTTPREL:
+ case MCSymbolRefExpr::VK_Mips_TPREL_HI:
+ case MCSymbolRefExpr::VK_Mips_TPREL_LO:
+ case MCSymbolRefExpr::VK_PPC_DTPMOD:
+ case MCSymbolRefExpr::VK_PPC_TPREL:
+ case MCSymbolRefExpr::VK_PPC_TPREL_LO:
+ case MCSymbolRefExpr::VK_PPC_TPREL_HI:
+ case MCSymbolRefExpr::VK_PPC_TPREL_HA:
+ case MCSymbolRefExpr::VK_PPC_TPREL_HIGHER:
+ case MCSymbolRefExpr::VK_PPC_TPREL_HIGHERA:
+ case MCSymbolRefExpr::VK_PPC_TPREL_HIGHEST:
+ case MCSymbolRefExpr::VK_PPC_TPREL_HIGHESTA:
+ case MCSymbolRefExpr::VK_PPC_DTPREL:
+ case MCSymbolRefExpr::VK_PPC_DTPREL_LO:
+ case MCSymbolRefExpr::VK_PPC_DTPREL_HI:
+ case MCSymbolRefExpr::VK_PPC_DTPREL_HA:
+ case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHER:
+ case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHERA:
+ case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHEST:
+ case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHESTA:
+ case MCSymbolRefExpr::VK_PPC_GOT_TPREL:
+ case MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO:
+ case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HI:
+ case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA:
+ case MCSymbolRefExpr::VK_PPC_GOT_DTPREL:
+ case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_LO:
+ case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HI:
+ case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HA:
+ case MCSymbolRefExpr::VK_PPC_TLS:
+ case MCSymbolRefExpr::VK_PPC_GOT_TLSGD:
+ case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO:
+ case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HI:
+ case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA:
+ case MCSymbolRefExpr::VK_PPC_TLSGD:
+ case MCSymbolRefExpr::VK_PPC_GOT_TLSLD:
+ case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO:
+ case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HI:
+ case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA:
+ case MCSymbolRefExpr::VK_PPC_TLSLD:
break;
}
MCSymbolData &SD = getAssembler().getOrCreateSymbolData(symRef.getSymbol());
- SetType(SD, ELF::STT_TLS);
+ MCELF::SetType(SD, ELF::STT_TLS);
break;
}
}
}
-void MCELFStreamer::EmitInstToFragment(const MCInst &Inst) {
- this->MCObjectStreamer::EmitInstToFragment(Inst);
- MCInstFragment &F = *cast<MCInstFragment>(getCurrentFragment());
+void MCELFStreamer::EmitInstToFragment(const MCInst &Inst,
+ const MCSubtargetInfo &STI) {
+ this->MCObjectStreamer::EmitInstToFragment(Inst, STI);
+ MCRelaxableFragment &F = *cast<MCRelaxableFragment>(getCurrentFragment());
for (unsigned i = 0, e = F.getFixups().size(); i != e; ++i)
fixSymbolsInTLSFixups(F.getFixups()[i].getValue());
}
-void MCELFStreamer::EmitInstToData(const MCInst &Inst) {
- MCDataFragment *DF = getOrCreateDataFragment();
-
+void MCELFStreamer::EmitInstToData(const MCInst &Inst,
+ const MCSubtargetInfo &STI) {
+ MCAssembler &Assembler = getAssembler();
SmallVector<MCFixup, 4> Fixups;
SmallString<256> Code;
raw_svector_ostream VecOS(Code);
- getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, Fixups);
+ Assembler.getEmitter().EncodeInstruction(Inst, VecOS, Fixups, STI);
VecOS.flush();
for (unsigned i = 0, e = Fixups.size(); i != e; ++i)
fixSymbolsInTLSFixups(Fixups[i].getValue());
+ // There are several possibilities here:
+ //
+ // If bundling is disabled, append the encoded instruction to the current data
+ // fragment (or create a new such fragment if the current fragment is not a
+ // data fragment).
+ //
+ // If bundling is enabled:
+ // - If we're not in a bundle-locked group, emit the instruction into a
+ // fragment of its own. If there are no fixups registered for the
+ // instruction, emit a MCCompactEncodedInstFragment. Otherwise, emit a
+ // MCDataFragment.
+ // - If we're in a bundle-locked group, append the instruction to the current
+ // data fragment because we want all the instructions in a group to get into
+ // the same fragment. Be careful not to do that for the first instruction in
+ // the group, though.
+ MCDataFragment *DF;
+
+ if (Assembler.isBundlingEnabled()) {
+ MCSectionData *SD = getCurrentSectionData();
+ if (SD->isBundleLocked() && !SD->isBundleGroupBeforeFirstInst())
+ // If we are bundle-locked, we re-use the current fragment.
+ // The bundle-locking directive ensures this is a new data fragment.
+ DF = cast<MCDataFragment>(getCurrentFragment());
+ else if (!SD->isBundleLocked() && Fixups.size() == 0) {
+ // Optimize memory usage by emitting the instruction to a
+ // MCCompactEncodedInstFragment when not in a bundle-locked group and
+ // there are no fixups registered.
+ MCCompactEncodedInstFragment *CEIF = new MCCompactEncodedInstFragment();
+ insert(CEIF);
+ CEIF->getContents().append(Code.begin(), Code.end());
+ return;
+ } else {
+ DF = new MCDataFragment();
+ insert(DF);
+ }
+ if (SD->getBundleLockState() == MCSectionData::BundleLockedAlignToEnd) {
+ // If this fragment is for a group marked "align_to_end", set a flag
+ // in the fragment. This can happen after the fragment has already been
+ // created if there are nested bundle_align groups and an inner one
+ // is the one marked align_to_end.
+ DF->setAlignToBundleEnd(true);
+ }
+
+ // We're now emitting an instruction in a bundle group, so this flag has
+ // to be turned off.
+ SD->setBundleGroupBeforeFirstInst(false);
+ } else {
+ DF = getOrCreateDataFragment();
+ }
+
// Add the fixups and data.
for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
Fixups[i].setOffset(Fixups[i].getOffset() + DF->getContents().size());
- DF->addFixup(Fixups[i]);
+ DF->getFixups().push_back(Fixups[i]);
}
+ DF->setHasInstructions(true);
DF->getContents().append(Code.begin(), Code.end());
}
-void MCELFStreamer::Finish() {
- if (getNumFrameInfos())
- MCDwarfFrameEmitter::Emit(*this);
+void MCELFStreamer::EmitBundleAlignMode(unsigned AlignPow2) {
+ assert(AlignPow2 <= 30 && "Invalid bundle alignment");
+ MCAssembler &Assembler = getAssembler();
+ if (AlignPow2 > 0 && (Assembler.getBundleAlignSize() == 0 ||
+ Assembler.getBundleAlignSize() == 1U << AlignPow2))
+ Assembler.setBundleAlignSize(1U << AlignPow2);
+ else
+ report_fatal_error(".bundle_align_mode cannot be changed once set");
+}
+
+void MCELFStreamer::EmitBundleLock(bool AlignToEnd) {
+ MCSectionData *SD = getCurrentSectionData();
+
+ // Sanity checks
+ //
+ if (!getAssembler().isBundlingEnabled())
+ report_fatal_error(".bundle_lock forbidden when bundling is disabled");
+
+ if (!SD->isBundleLocked())
+ SD->setBundleGroupBeforeFirstInst(true);
+ SD->setBundleLockState(AlignToEnd ? MCSectionData::BundleLockedAlignToEnd :
+ MCSectionData::BundleLocked);
+}
+
+void MCELFStreamer::EmitBundleUnlock() {
+ MCSectionData *SD = getCurrentSectionData();
+
+ // Sanity checks
+ if (!getAssembler().isBundlingEnabled())
+ report_fatal_error(".bundle_unlock forbidden when bundling is disabled");
+ else if (!SD->isBundleLocked())
+ report_fatal_error(".bundle_unlock without matching lock");
+ else if (SD->isBundleGroupBeforeFirstInst())
+ report_fatal_error("Empty bundle-locked group is forbidden");
+
+ SD->setBundleLockState(MCSectionData::NotBundleLocked);
+}
+
+void MCELFStreamer::Flush() {
for (std::vector<LocalCommon>::const_iterator i = LocalCommons.begin(),
e = LocalCommons.end();
i != e; ++i) {
SectData.setAlignment(ByteAlignment);
}
- this->MCObjectStreamer::Finish();
+ LocalCommons.clear();
+}
+
+void MCELFStreamer::FinishImpl() {
+ EmitFrames(nullptr);
+
+ Flush();
+
+ this->MCObjectStreamer::FinishImpl();
}
-MCStreamer *llvm::createELFStreamer(MCContext &Context, TargetAsmBackend &TAB,
+MCStreamer *llvm::createELFStreamer(MCContext &Context, MCAsmBackend &MAB,
raw_ostream &OS, MCCodeEmitter *CE,
- bool RelaxAll, bool NoExecStack) {
- MCELFStreamer *S = new MCELFStreamer(Context, TAB, OS, CE);
+ bool RelaxAll) {
+ MCELFStreamer *S = new MCELFStreamer(Context, MAB, OS, CE);
if (RelaxAll)
S->getAssembler().setRelaxAll(true);
- if (NoExecStack)
- S->getAssembler().setNoExecStack(true);
return S;
}
+
+void MCELFStreamer::EmitThumbFunc(MCSymbol *Func) {
+ llvm_unreachable("Generic ELF doesn't support this directive");
+}
+
+void MCELFStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
+ llvm_unreachable("ELF doesn't support this directive");
+}
+
+void MCELFStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
+ llvm_unreachable("ELF doesn't support this directive");
+}
+
+void MCELFStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {
+ llvm_unreachable("ELF doesn't support this directive");
+}
+
+void MCELFStreamer::EmitCOFFSymbolType(int Type) {
+ llvm_unreachable("ELF doesn't support this directive");
+}
+
+void MCELFStreamer::EndCOFFSymbolDef() {
+ llvm_unreachable("ELF doesn't support this directive");
+}
+
+void MCELFStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
+ uint64_t Size, unsigned ByteAlignment) {
+ llvm_unreachable("ELF doesn't support this directive");
+}
+
+void MCELFStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
+ uint64_t Size, unsigned ByteAlignment) {
+ llvm_unreachable("ELF doesn't support this directive");
+}
projects / oota-llvm.git / blobdiff