-//===- lib/MC/MCELFStreamer.cpp - ELF Object Output ------------===//
+//===- lib/MC/MCELFStreamer.cpp - ELF Object Output -----------------------===//
//
// The LLVM Compiler Infrastructure
//
//
//===----------------------------------------------------------------------===//
-#include "MCELFStreamer.h"
-#include "MCELF.h"
-#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCELFStreamer.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/MC/MCAssembler.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/MCObjectStreamer.h"
#include "llvm/MC/MCSection.h"
+#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCValue.h"
-#include "llvm/MC/MCAsmBackend.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ELF.h"
#include "llvm/Support/ErrorHandling.h"
using namespace llvm;
+
+inline void MCELFStreamer::SetSection(StringRef Section, unsigned Type,
+ unsigned Flags, SectionKind Kind) {
+ SwitchSection(getContext().getELFSection(Section, Type, Flags, Kind));
+}
+
+inline void MCELFStreamer::SetSectionData() {
+ SetSection(".data",
+ ELF::SHT_PROGBITS,
+ ELF::SHF_WRITE | ELF::SHF_ALLOC,
+ SectionKind::getDataRel());
+ EmitCodeAlignment(4, 0);
+}
+
+inline void MCELFStreamer::SetSectionText() {
+ SetSection(".text",
+ ELF::SHT_PROGBITS,
+ ELF::SHF_EXECINSTR | ELF::SHF_ALLOC,
+ SectionKind::getText());
+ EmitCodeAlignment(4, 0);
+}
+
+inline void MCELFStreamer::SetSectionBss() {
+ SetSection(".bss",
+ ELF::SHT_NOBITS,
+ ELF::SHF_WRITE | ELF::SHF_ALLOC,
+ SectionKind::getBSS());
+ EmitCodeAlignment(4, 0);
+}
+
+MCELFStreamer::~MCELFStreamer() {
+}
+
+void MCELFStreamer::InitToTextSection() {
+ SetSectionText();
+}
+
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.
MCELF::SetType(SD, ELF::STT_TLS);
}
+void MCELFStreamer::EmitDebugLabel(MCSymbol *Symbol) {
+ EmitLabel(Symbol);
+}
+
void MCELFStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
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!");
-}
-
-void MCELFStreamer::EmitThumbFunc(MCSymbol *Func) {
- // FIXME: Anything needed here to flag the function as thumb?
-
- getAssembler().setIsThumbFunc(Func);
-
- MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Func);
- SD.setFlags(SD.getFlags() | ELF_Other_ThumbFunc);
-}
-
-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));
+ llvm_unreachable("invalid assembler flag!");
}
void MCELFStreamer::ChangeSection(const MCSection *Section) {
+ MCSectionData *CurSection = getCurrentSectionData();
+ if (CurSection && CurSection->isBundleLocked())
+ report_fatal_error("Unterminated .bundle_lock when changing a section");
const MCSymbol *Grp = static_cast<const MCSectionELF *>(Section)->getGroup();
if (Grp)
getAssembler().getOrCreateSymbolData(*Grp);
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;
+ llvm_unreachable("Invalid symbol attribute for ELF!");
+ case MCSA_NoDeadStrip:
case MCSA_ELF_TypeGnuUniqueObject:
// Ignore for now.
break;
MCELF::SetType(SD, ELF::STT_FUNC);
break;
+ case MCSA_ELF_TypeIndFunction:
+ MCELF::SetType(SD, ELF::STT_GNU_IFUNC);
+ break;
+
case MCSA_ELF_TypeObject:
MCELF::SetType(SD, ELF::STT_OBJECT);
break;
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());
+ ELF::SHT_NOBITS,
+ ELF::SHF_WRITE |
+ ELF::SHF_ALLOC,
+ SectionKind::getBSS());
Symbol->setSection(*Section);
struct LocalCommon L = {&SD, Size, ByteAlignment};
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);
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,
+ unsigned AddrSpace) {
+ if (getCurrentSectionData()->isBundleLocked())
+ report_fatal_error("Emitting values inside a locked bundle is forbidden");
+ fixSymbolsInTLSFixups(Value);
+ MCObjectStreamer::EmitValueImpl(Value, Size, AddrSpace);
}
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);
+ 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);
}
+
// 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) {
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;
case MCSymbolRefExpr::VK_ARM_TLSGD:
case MCSymbolRefExpr::VK_ARM_TPOFF:
case MCSymbolRefExpr::VK_ARM_GOTTPOFF:
+ 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_TPREL16_HA:
+ case MCSymbolRefExpr::VK_PPC_TPREL16_LO:
+ case MCSymbolRefExpr::VK_PPC_DTPREL16_HA:
+ case MCSymbolRefExpr::VK_PPC_DTPREL16_LO:
+ case MCSymbolRefExpr::VK_PPC_GOT_TPREL16_HA:
+ case MCSymbolRefExpr::VK_PPC_GOT_TPREL16_LO:
+ case MCSymbolRefExpr::VK_PPC_TLS:
+ case MCSymbolRefExpr::VK_PPC_GOT_TLSGD16_HA:
+ case MCSymbolRefExpr::VK_PPC_GOT_TLSGD16_LO:
+ case MCSymbolRefExpr::VK_PPC_TLSGD:
+ case MCSymbolRefExpr::VK_PPC_GOT_TLSLD16_HA:
+ case MCSymbolRefExpr::VK_PPC_GOT_TLSLD16_LO:
+ case MCSymbolRefExpr::VK_PPC_TLSLD:
break;
}
MCSymbolData &SD = getAssembler().getOrCreateSymbolData(symRef.getSymbol());
void MCELFStreamer::EmitInstToFragment(const MCInst &Inst) {
this->MCObjectStreamer::EmitInstToFragment(Inst);
- MCInstFragment &F = *cast<MCInstFragment>(getCurrentFragment());
+ 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();
-
+ 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);
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(SD);
+ CEIF->getContents().append(Code.begin(), Code.end());
+ return;
+ } else {
+ DF = new MCDataFragment(SD);
+ if (SD->getBundleLockState() == MCSectionData::BundleLockedAlignToEnd) {
+ // If this is a new fragment created for a bundle-locked group, and the
+ // group was marked as "align_to_end", set a flag in the fragment.
+ 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() {
+void MCELFStreamer::EmitBundleAlignMode(unsigned AlignPow2) {
+ assert(AlignPow2 <= 30 && "Invalid bundle alignment");
+ MCAssembler &Assembler = getAssembler();
+ if (Assembler.getBundleAlignSize() == 0 && AlignPow2 > 0)
+ Assembler.setBundleAlignSize(1 << AlignPow2);
+ else
+ report_fatal_error(".bundle_align_mode should be only set once per file");
+}
+
+void MCELFStreamer::EmitBundleLock(bool AlignToEnd) {
+ MCSectionData *SD = getCurrentSectionData();
+
+ // Sanity checks
+ //
+ if (!getAssembler().isBundlingEnabled())
+ report_fatal_error(".bundle_lock forbidden when bundling is disabled");
+ else if (SD->isBundleLocked())
+ report_fatal_error("Nesting of .bundle_lock is forbidden");
+
+ SD->setBundleLockState(AlignToEnd ? MCSectionData::BundleLockedAlignToEnd :
+ MCSectionData::BundleLocked);
+ SD->setBundleGroupBeforeFirstInst(true);
+}
+
+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::FinishImpl() {
EmitFrames(true);
for (std::vector<LocalCommon>::const_iterator i = LocalCommons.begin(),
SectData.setAlignment(ByteAlignment);
}
- this->MCObjectStreamer::Finish();
+ this->MCObjectStreamer::FinishImpl();
+}
+void MCELFStreamer::EmitTCEntry(const MCSymbol &S) {
+ // Creates a R_PPC64_TOC relocation
+ MCObjectStreamer::EmitSymbolValue(&S, 8);
}
MCStreamer *llvm::createELFStreamer(MCContext &Context, MCAsmBackend &MAB,
S->getAssembler().setNoExecStack(true);
return S;
}
+
+void MCELFStreamer::EmitThumbFunc(MCSymbol *Func) {
+ llvm_unreachable("Generic ELF doesn't support this directive");
+}
+
+MCSymbolData &MCELFStreamer::getOrCreateSymbolData(MCSymbol *Symbol) {
+ return getAssembler().getOrCreateSymbolData(*Symbol);
+}
+
+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");
+}