#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/TargetRegistry.h"
using namespace llvm;
MCObjectStreamer::MCObjectStreamer(MCContext &Context, MCAsmBackend &TAB,
- raw_ostream &OS, MCCodeEmitter *Emitter_)
+ raw_pwrite_stream &OS,
+ MCCodeEmitter *Emitter_)
: MCStreamer(Context),
Assembler(new MCAssembler(Context, TAB, *Emitter_,
- *TAB.createObjectWriter(OS), OS)),
- CurSectionData(0) {}
-
-MCObjectStreamer::MCObjectStreamer(MCContext &Context, MCAsmBackend &TAB,
- raw_ostream &OS, MCCodeEmitter *Emitter_,
- MCAssembler *_Assembler)
- : MCStreamer(Context), Assembler(_Assembler), CurSectionData(0) {}
+ *TAB.createObjectWriter(OS))),
+ EmitEHFrame(true), EmitDebugFrame(false) {}
MCObjectStreamer::~MCObjectStreamer() {
delete &Assembler->getBackend();
delete Assembler;
}
+void MCObjectStreamer::flushPendingLabels(MCFragment *F, uint64_t FOffset) {
+ if (PendingLabels.empty())
+ return;
+ if (!F) {
+ F = new MCDataFragment();
+ MCSection *CurSection = getCurrentSectionOnly();
+ CurSection->getFragmentList().insert(CurInsertionPoint, F);
+ F->setParent(CurSection);
+ }
+ for (MCSymbol *Sym : PendingLabels) {
+ Sym->setFragment(F);
+ Sym->setOffset(FOffset);
+ }
+ PendingLabels.clear();
+}
+
+void MCObjectStreamer::emitAbsoluteSymbolDiff(const MCSymbol *Hi,
+ const MCSymbol *Lo,
+ unsigned Size) {
+ // If not assigned to the same (valid) fragment, fallback.
+ if (!Hi->getFragment() || Hi->getFragment() != Lo->getFragment() ||
+ Hi->isVariable() || Lo->isVariable()) {
+ MCStreamer::emitAbsoluteSymbolDiff(Hi, Lo, Size);
+ return;
+ }
+
+ assert(Hi->getOffset() >= Lo->getOffset() &&
+ "Expected Hi to be greater than Lo");
+ EmitIntValue(Hi->getOffset() - Lo->getOffset(), Size);
+}
+
void MCObjectStreamer::reset() {
if (Assembler)
Assembler->reset();
- CurSectionData = 0;
- CurInsertionPoint = MCSectionData::iterator();
+ CurInsertionPoint = MCSection::iterator();
+ EmitEHFrame = true;
+ EmitDebugFrame = false;
+ PendingLabels.clear();
MCStreamer::reset();
}
+void MCObjectStreamer::EmitFrames(MCAsmBackend *MAB) {
+ if (!getNumFrameInfos())
+ return;
+
+ if (EmitEHFrame)
+ MCDwarfFrameEmitter::Emit(*this, MAB, true);
+
+ if (EmitDebugFrame)
+ MCDwarfFrameEmitter::Emit(*this, MAB, false);
+}
+
MCFragment *MCObjectStreamer::getCurrentFragment() const {
- assert(getCurrentSectionData() && "No current section!");
+ assert(getCurrentSectionOnly() && "No current section!");
- if (CurInsertionPoint != getCurrentSectionData()->getFragmentList().begin())
- return prior(CurInsertionPoint);
+ if (CurInsertionPoint != getCurrentSectionOnly()->getFragmentList().begin())
+ return &*std::prev(CurInsertionPoint);
- return 0;
+ return nullptr;
}
-MCDataFragment *MCObjectStreamer::getOrCreateDataFragment() const {
+MCDataFragment *MCObjectStreamer::getOrCreateDataFragment() {
MCDataFragment *F = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
// When bundling is enabled, we don't want to add data to a fragment that
// already has instructions (see MCELFStreamer::EmitInstToData for details)
- if (!F || (Assembler->isBundlingEnabled() && F->hasInstructions())) {
+ if (!F || (Assembler->isBundlingEnabled() && !Assembler->getRelaxAll() &&
+ F->hasInstructions())) {
F = new MCDataFragment();
insert(F);
}
return F;
}
-const MCExpr *MCObjectStreamer::AddValueSymbols(const MCExpr *Value) {
- switch (Value->getKind()) {
- case MCExpr::Target:
- cast<MCTargetExpr>(Value)->AddValueSymbols(Assembler);
- break;
-
- case MCExpr::Constant:
- break;
-
- case MCExpr::Binary: {
- const MCBinaryExpr *BE = cast<MCBinaryExpr>(Value);
- AddValueSymbols(BE->getLHS());
- AddValueSymbols(BE->getRHS());
- break;
- }
-
- case MCExpr::SymbolRef:
- Assembler->getOrCreateSymbolData(cast<MCSymbolRefExpr>(Value)->getSymbol());
- break;
-
- case MCExpr::Unary:
- AddValueSymbols(cast<MCUnaryExpr>(Value)->getSubExpr());
- break;
- }
+void MCObjectStreamer::visitUsedSymbol(const MCSymbol &Sym) {
+ Assembler->registerSymbol(Sym);
+}
- return Value;
+void MCObjectStreamer::EmitCFISections(bool EH, bool Debug) {
+ MCStreamer::EmitCFISections(EH, Debug);
+ EmitEHFrame = EH;
+ EmitDebugFrame = Debug;
}
-void MCObjectStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size) {
+void MCObjectStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
+ SMLoc Loc) {
+ MCStreamer::EmitValueImpl(Value, Size, Loc);
MCDataFragment *DF = getOrCreateDataFragment();
+ flushPendingLabels(DF, DF->getContents().size());
MCLineEntry::Make(this, getCurrentSection().first);
// Avoid fixups when possible.
int64_t AbsValue;
- if (AddValueSymbols(Value)->EvaluateAsAbsolute(AbsValue, getAssembler())) {
+ if (Value->evaluateAsAbsolute(AbsValue, getAssembler())) {
EmitIntValue(AbsValue, Size);
return;
}
DF->getFixups().push_back(
- MCFixup::Create(DF->getContents().size(), Value,
- MCFixup::getKindForSize(Size, false)));
+ MCFixup::create(DF->getContents().size(), Value,
+ MCFixup::getKindForSize(Size, false), Loc));
DF->getContents().resize(DF->getContents().size() + Size, 0);
}
void MCObjectStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
- RecordProcStart(Frame);
+ // We need to create a local symbol to avoid relocations.
+ Frame.Begin = getContext().createTempSymbol();
+ EmitLabel(Frame.Begin);
}
void MCObjectStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
- RecordProcEnd(Frame);
+ Frame.End = getContext().createTempSymbol();
+ EmitLabel(Frame.End);
}
void MCObjectStreamer::EmitLabel(MCSymbol *Symbol) {
MCStreamer::EmitLabel(Symbol);
- MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
-
- // FIXME: This is wasteful, we don't necessarily need to create a data
- // fragment. Instead, we should mark the symbol as pointing into the data
- // fragment if it exists, otherwise we should just queue the label and set its
- // fragment pointer when we emit the next fragment.
- MCDataFragment *F = getOrCreateDataFragment();
- assert(!SD.getFragment() && "Unexpected fragment on symbol data!");
- SD.setFragment(F);
- SD.setOffset(F->getContents().size());
-}
-
-void MCObjectStreamer::EmitDebugLabel(MCSymbol *Symbol) {
- EmitLabel(Symbol);
+ getAssembler().registerSymbol(*Symbol);
+
+ // If there is a current fragment, mark the symbol as pointing into it.
+ // Otherwise queue the label and set its fragment pointer when we emit the
+ // next fragment.
+ auto *F = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
+ if (F && !(getAssembler().isBundlingEnabled() &&
+ getAssembler().getRelaxAll())) {
+ Symbol->setFragment(F);
+ Symbol->setOffset(F->getContents().size());
+ } else {
+ PendingLabels.push_back(Symbol);
+ }
}
void MCObjectStreamer::EmitULEB128Value(const MCExpr *Value) {
int64_t IntValue;
- if (Value->EvaluateAsAbsolute(IntValue, getAssembler())) {
+ if (Value->evaluateAsAbsolute(IntValue, getAssembler())) {
EmitULEB128IntValue(IntValue);
return;
}
- Value = ForceExpAbs(Value);
insert(new MCLEBFragment(*Value, false));
}
void MCObjectStreamer::EmitSLEB128Value(const MCExpr *Value) {
int64_t IntValue;
- if (Value->EvaluateAsAbsolute(IntValue, getAssembler())) {
+ if (Value->evaluateAsAbsolute(IntValue, getAssembler())) {
EmitSLEB128IntValue(IntValue);
return;
}
- Value = ForceExpAbs(Value);
insert(new MCLEBFragment(*Value, true));
}
report_fatal_error("This file format doesn't support weak aliases.");
}
-void MCObjectStreamer::ChangeSection(const MCSection *Section,
+void MCObjectStreamer::ChangeSection(MCSection *Section,
const MCExpr *Subsection) {
+ changeSectionImpl(Section, Subsection);
+}
+
+bool MCObjectStreamer::changeSectionImpl(MCSection *Section,
+ const MCExpr *Subsection) {
assert(Section && "Cannot switch to a null section!");
+ flushPendingLabels(nullptr);
- CurSectionData = &getAssembler().getOrCreateSectionData(*Section);
+ bool Created = getAssembler().registerSection(*Section);
int64_t IntSubsection = 0;
if (Subsection &&
- !Subsection->EvaluateAsAbsolute(IntSubsection, getAssembler()))
+ !Subsection->evaluateAsAbsolute(IntSubsection, getAssembler()))
report_fatal_error("Cannot evaluate subsection number");
if (IntSubsection < 0 || IntSubsection > 8192)
report_fatal_error("Subsection number out of range");
CurInsertionPoint =
- CurSectionData->getSubsectionInsertionPoint(unsigned(IntSubsection));
+ Section->getSubsectionInsertionPoint(unsigned(IntSubsection));
+ return Created;
}
void MCObjectStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
- getAssembler().getOrCreateSymbolData(*Symbol);
- Symbol->setVariableValue(AddValueSymbols(Value));
+ getAssembler().registerSymbol(*Symbol);
+ MCStreamer::EmitAssignment(Symbol, Value);
+}
+
+bool MCObjectStreamer::mayHaveInstructions(MCSection &Sec) const {
+ return Sec.hasInstructions();
}
-void MCObjectStreamer::EmitInstruction(const MCInst &Inst) {
- // Scan for values.
- for (unsigned i = Inst.getNumOperands(); i--; )
- if (Inst.getOperand(i).isExpr())
- AddValueSymbols(Inst.getOperand(i).getExpr());
+void MCObjectStreamer::EmitInstruction(const MCInst &Inst,
+ const MCSubtargetInfo &STI) {
+ MCStreamer::EmitInstruction(Inst, STI);
- MCSectionData *SD = getCurrentSectionData();
- SD->setHasInstructions(true);
+ MCSection *Sec = getCurrentSectionOnly();
+ Sec->setHasInstructions(true);
// Now that a machine instruction has been assembled into this section, make
// a line entry for any .loc directive that has been seen.
// If this instruction doesn't need relaxation, just emit it as data.
MCAssembler &Assembler = getAssembler();
if (!Assembler.getBackend().mayNeedRelaxation(Inst)) {
- EmitInstToData(Inst);
+ EmitInstToData(Inst, STI);
return;
}
// group. We want to emit all such instructions into the same data
// fragment.
if (Assembler.getRelaxAll() ||
- (Assembler.isBundlingEnabled() && SD->isBundleLocked())) {
+ (Assembler.isBundlingEnabled() && Sec->isBundleLocked())) {
MCInst Relaxed;
getAssembler().getBackend().relaxInstruction(Inst, Relaxed);
while (getAssembler().getBackend().mayNeedRelaxation(Relaxed))
getAssembler().getBackend().relaxInstruction(Relaxed, Relaxed);
- EmitInstToData(Relaxed);
+ EmitInstToData(Relaxed, STI);
return;
}
// Otherwise emit to a separate fragment.
- EmitInstToFragment(Inst);
+ EmitInstToFragment(Inst, STI);
}
-void MCObjectStreamer::EmitInstToFragment(const MCInst &Inst) {
+void MCObjectStreamer::EmitInstToFragment(const MCInst &Inst,
+ const MCSubtargetInfo &STI) {
+ if (getAssembler().getRelaxAll() && getAssembler().isBundlingEnabled())
+ llvm_unreachable("All instructions should have already been relaxed");
+
// Always create a new, separate fragment here, because its size can change
// during relaxation.
- MCRelaxableFragment *IF = new MCRelaxableFragment(Inst);
+ MCRelaxableFragment *IF = new MCRelaxableFragment(Inst, STI);
insert(IF);
SmallString<128> Code;
raw_svector_ostream VecOS(Code);
- getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, IF->getFixups());
- VecOS.flush();
+ getAssembler().getEmitter().encodeInstruction(Inst, VecOS, IF->getFixups(),
+ STI);
IF->getContents().append(Code.begin(), Code.end());
}
Isa, Discriminator, FileName);
}
+static const MCExpr *buildSymbolDiff(MCObjectStreamer &OS, const MCSymbol *A,
+ const MCSymbol *B) {
+ MCContext &Context = OS.getContext();
+ MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
+ const MCExpr *ARef = MCSymbolRefExpr::create(A, Variant, Context);
+ const MCExpr *BRef = MCSymbolRefExpr::create(B, Variant, Context);
+ const MCExpr *AddrDelta =
+ MCBinaryExpr::create(MCBinaryExpr::Sub, ARef, BRef, Context);
+ return AddrDelta;
+}
+
+static void emitDwarfSetLineAddr(MCObjectStreamer &OS,
+ MCDwarfLineTableParams Params,
+ int64_t LineDelta, const MCSymbol *Label,
+ int PointerSize) {
+ // emit the sequence to set the address
+ OS.EmitIntValue(dwarf::DW_LNS_extended_op, 1);
+ OS.EmitULEB128IntValue(PointerSize + 1);
+ OS.EmitIntValue(dwarf::DW_LNE_set_address, 1);
+ OS.EmitSymbolValue(Label, PointerSize);
+
+ // emit the sequence for the LineDelta (from 1) and a zero address delta.
+ MCDwarfLineAddr::Emit(&OS, Params, LineDelta, 0);
+}
+
void MCObjectStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
const MCSymbol *LastLabel,
const MCSymbol *Label,
unsigned PointerSize) {
if (!LastLabel) {
- EmitDwarfSetLineAddr(LineDelta, Label, PointerSize);
+ emitDwarfSetLineAddr(*this, Assembler->getDWARFLinetableParams(), LineDelta,
+ Label, PointerSize);
return;
}
- const MCExpr *AddrDelta = BuildSymbolDiff(getContext(), Label, LastLabel);
+ const MCExpr *AddrDelta = buildSymbolDiff(*this, Label, LastLabel);
int64_t Res;
- if (AddrDelta->EvaluateAsAbsolute(Res, getAssembler())) {
- MCDwarfLineAddr::Emit(this, LineDelta, Res);
+ if (AddrDelta->evaluateAsAbsolute(Res, getAssembler())) {
+ MCDwarfLineAddr::Emit(this, Assembler->getDWARFLinetableParams(), LineDelta,
+ Res);
return;
}
- AddrDelta = ForceExpAbs(AddrDelta);
insert(new MCDwarfLineAddrFragment(LineDelta, *AddrDelta));
}
void MCObjectStreamer::EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
const MCSymbol *Label) {
- const MCExpr *AddrDelta = BuildSymbolDiff(getContext(), Label, LastLabel);
+ const MCExpr *AddrDelta = buildSymbolDiff(*this, Label, LastLabel);
int64_t Res;
- if (AddrDelta->EvaluateAsAbsolute(Res, getAssembler())) {
+ if (AddrDelta->evaluateAsAbsolute(Res, getAssembler())) {
MCDwarfFrameEmitter::EmitAdvanceLoc(*this, Res);
return;
}
- AddrDelta = ForceExpAbs(AddrDelta);
insert(new MCDwarfCallFrameFragment(*AddrDelta));
}
void MCObjectStreamer::EmitBytes(StringRef Data) {
MCLineEntry::Make(this, getCurrentSection().first);
- getOrCreateDataFragment()->getContents().append(Data.begin(), Data.end());
+ MCDataFragment *DF = getOrCreateDataFragment();
+ flushPendingLabels(DF, DF->getContents().size());
+ DF->getContents().append(Data.begin(), Data.end());
}
void MCObjectStreamer::EmitValueToAlignment(unsigned ByteAlignment,
insert(new MCAlignFragment(ByteAlignment, Value, ValueSize, MaxBytesToEmit));
// Update the maximum alignment on the current section if necessary.
- if (ByteAlignment > getCurrentSectionData()->getAlignment())
- getCurrentSectionData()->setAlignment(ByteAlignment);
+ MCSection *CurSec = getCurrentSection().first;
+ if (ByteAlignment > CurSec->getAlignment())
+ CurSec->setAlignment(ByteAlignment);
}
void MCObjectStreamer::EmitCodeAlignment(unsigned ByteAlignment,
cast<MCAlignFragment>(getCurrentFragment())->setEmitNops(true);
}
-bool MCObjectStreamer::EmitValueToOffset(const MCExpr *Offset,
+void MCObjectStreamer::emitValueToOffset(const MCExpr *Offset,
unsigned char Value) {
- int64_t Res;
- if (Offset->EvaluateAsAbsolute(Res, getAssembler())) {
- insert(new MCOrgFragment(*Offset, Value));
- return false;
- }
-
- MCSymbol *CurrentPos = getContext().CreateTempSymbol();
- EmitLabel(CurrentPos);
- MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
- const MCExpr *Ref =
- MCSymbolRefExpr::Create(CurrentPos, Variant, getContext());
- const MCExpr *Delta =
- MCBinaryExpr::Create(MCBinaryExpr::Sub, Offset, Ref, getContext());
-
- if (!Delta->EvaluateAsAbsolute(Res, getAssembler()))
- return true;
- EmitFill(Res, Value);
- return false;
+ insert(new MCOrgFragment(*Offset, Value));
}
// Associate GPRel32 fixup with data and resize data area
void MCObjectStreamer::EmitGPRel32Value(const MCExpr *Value) {
MCDataFragment *DF = getOrCreateDataFragment();
+ flushPendingLabels(DF, DF->getContents().size());
- DF->getFixups().push_back(MCFixup::Create(DF->getContents().size(),
+ DF->getFixups().push_back(MCFixup::create(DF->getContents().size(),
Value, FK_GPRel_4));
DF->getContents().resize(DF->getContents().size() + 4, 0);
}
// Associate GPRel32 fixup with data and resize data area
void MCObjectStreamer::EmitGPRel64Value(const MCExpr *Value) {
MCDataFragment *DF = getOrCreateDataFragment();
+ flushPendingLabels(DF, DF->getContents().size());
- DF->getFixups().push_back(MCFixup::Create(DF->getContents().size(),
+ DF->getFixups().push_back(MCFixup::create(DF->getContents().size(),
Value, FK_GPRel_4));
DF->getContents().resize(DF->getContents().size() + 8, 0);
}
-void MCObjectStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue) {
- // FIXME: A MCFillFragment would be more memory efficient but MCExpr has
- // problems evaluating expressions across multiple fragments.
- getOrCreateDataFragment()->getContents().append(NumBytes, FillValue);
+bool MCObjectStreamer::EmitRelocDirective(const MCExpr &Offset, StringRef Name,
+ const MCExpr *Expr, SMLoc Loc) {
+ int64_t OffsetValue;
+ if (!Offset.evaluateAsAbsolute(OffsetValue))
+ llvm_unreachable("Offset is not absolute");
+
+ MCDataFragment *DF = getOrCreateDataFragment();
+ flushPendingLabels(DF, DF->getContents().size());
+
+ MCFixupKind Kind;
+ if (!Assembler->getBackend().getFixupKind(Name, Kind))
+ return true;
+
+ if (Expr == nullptr)
+ Expr =
+ MCSymbolRefExpr::create(getContext().createTempSymbol(), getContext());
+ DF->getFixups().push_back(MCFixup::create(OffsetValue, Expr, Kind, Loc));
+ return false;
}
-void MCObjectStreamer::EmitZeros(uint64_t NumBytes) {
- unsigned ItemSize = getCurrentSection().first->isVirtualSection() ? 0 : 1;
- insert(new MCFillFragment(0, ItemSize, NumBytes));
+void MCObjectStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue) {
+ const MCSection *Sec = getCurrentSection().first;
+ assert(Sec && "need a section");
+ unsigned ItemSize = Sec->isVirtualSection() ? 0 : 1;
+ insert(new MCFillFragment(FillValue, ItemSize, NumBytes));
}
void MCObjectStreamer::FinishImpl() {
- // Dump out the dwarf file & directory tables and line tables.
- const MCSymbol *LineSectionSymbol = NULL;
- if (getContext().hasDwarfFiles())
- LineSectionSymbol = MCDwarfFileTable::Emit(this);
-
// If we are generating dwarf for assembly source files dump out the sections.
if (getContext().getGenDwarfForAssembly())
- MCGenDwarfInfo::Emit(this, LineSectionSymbol);
+ MCGenDwarfInfo::Emit(this);
+
+ // Dump out the dwarf file & directory tables and line tables.
+ MCDwarfLineTable::Emit(this, getAssembler().getDWARFLinetableParams());
+ flushPendingLabels(nullptr);
getAssembler().Finish();
}
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