//===----------------------------------------------------------------------===//
#include "llvm/MC/MCObjectStreamer.h"
-
-#include "llvm/Support/ErrorHandling.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/MC/MCAsmBackend.h"
+#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCCodeEmitter.h"
+#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCDwarf.h"
#include "llvm/MC/MCExpr.h"
-#include "llvm/Target/TargetAsmBackend.h"
+#include "llvm/MC/MCObjectWriter.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MCSection.h"
+#include "llvm/Support/ErrorHandling.h"
using namespace llvm;
-MCObjectStreamer::MCObjectStreamer(MCContext &Context, TargetAsmBackend &TAB,
- raw_ostream &_OS, MCCodeEmitter *_Emitter,
- bool _PadSectionToAlignment)
- : MCStreamer(Context), Assembler(new MCAssembler(Context, TAB,
- *_Emitter,
- _PadSectionToAlignment,
- _OS)),
- CurSectionData(0)
-{
-}
+MCObjectStreamer::MCObjectStreamer(MCContext &Context,
+ MCTargetStreamer *TargetStreamer,
+ MCAsmBackend &TAB, raw_ostream &OS,
+ MCCodeEmitter *Emitter_)
+ : MCStreamer(Context, TargetStreamer),
+ Assembler(new MCAssembler(Context, TAB, *Emitter_,
+ *TAB.createObjectWriter(OS), OS)),
+ CurSectionData(0) {}
+
+MCObjectStreamer::MCObjectStreamer(MCContext &Context,
+ MCTargetStreamer *TargetStreamer,
+ MCAsmBackend &TAB, raw_ostream &OS,
+ MCCodeEmitter *Emitter_,
+ MCAssembler *_Assembler)
+ : MCStreamer(Context, TargetStreamer), Assembler(_Assembler),
+ CurSectionData(0) {}
MCObjectStreamer::~MCObjectStreamer() {
delete &Assembler->getBackend();
delete &Assembler->getEmitter();
+ delete &Assembler->getWriter();
delete Assembler;
}
+void MCObjectStreamer::reset() {
+ if (Assembler)
+ Assembler->reset();
+ CurSectionData = 0;
+ CurInsertionPoint = MCSectionData::iterator();
+ MCStreamer::reset();
+}
+
MCFragment *MCObjectStreamer::getCurrentFragment() const {
assert(getCurrentSectionData() && "No current section!");
- if (!getCurrentSectionData()->empty())
- return &getCurrentSectionData()->getFragmentList().back();
+ if (CurInsertionPoint != getCurrentSectionData()->getFragmentList().begin())
+ return prior(CurInsertionPoint);
return 0;
}
MCDataFragment *MCObjectStreamer::getOrCreateDataFragment() const {
MCDataFragment *F = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
- if (!F)
- F = new MCDataFragment(getCurrentSectionData());
+ // 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())) {
+ F = new MCDataFragment();
+ insert(F);
+ }
return F;
}
const MCExpr *MCObjectStreamer::AddValueSymbols(const MCExpr *Value) {
switch (Value->getKind()) {
- case MCExpr::Target: llvm_unreachable("Can't handle target exprs yet!");
+ case MCExpr::Target:
+ cast<MCTargetExpr>(Value)->AddValueSymbols(Assembler);
+ break;
+
case MCExpr::Constant:
break;
return Value;
}
-void MCObjectStreamer::EmitULEB128Value(const MCExpr *Value,
- unsigned AddrSpace) {
- new MCLEBFragment(*Value, false, getCurrentSectionData());
+void MCObjectStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size) {
+ MCDataFragment *DF = getOrCreateDataFragment();
+
+ MCLineEntry::Make(this, getCurrentSection().first);
+
+ // Avoid fixups when possible.
+ int64_t AbsValue;
+ if (AddValueSymbols(Value)->EvaluateAsAbsolute(AbsValue, getAssembler())) {
+ EmitIntValue(AbsValue, Size);
+ return;
+ }
+ DF->getFixups().push_back(
+ MCFixup::Create(DF->getContents().size(), Value,
+ MCFixup::getKindForSize(Size, false)));
+ DF->getContents().resize(DF->getContents().size() + Size, 0);
+}
+
+void MCObjectStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
+ RecordProcStart(Frame);
}
-void MCObjectStreamer::EmitSLEB128Value(const MCExpr *Value,
- unsigned AddrSpace) {
- new MCLEBFragment(*Value, true, getCurrentSectionData());
+void MCObjectStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
+ RecordProcEnd(Frame);
+}
+
+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);
+}
+
+void MCObjectStreamer::EmitULEB128Value(const MCExpr *Value) {
+ int64_t IntValue;
+ 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())) {
+ EmitSLEB128IntValue(IntValue);
+ return;
+ }
+ Value = ForceExpAbs(Value);
+ insert(new MCLEBFragment(*Value, true));
}
void MCObjectStreamer::EmitWeakReference(MCSymbol *Alias,
report_fatal_error("This file format doesn't support weak aliases.");
}
-void MCObjectStreamer::SwitchSection(const MCSection *Section) {
+void MCObjectStreamer::ChangeSection(const MCSection *Section,
+ const MCExpr *Subsection) {
assert(Section && "Cannot switch to a null section!");
- // If already in this section, then this is a noop.
- if (Section == CurSection) return;
-
- PrevSection = CurSection;
- CurSection = Section;
CurSectionData = &getAssembler().getOrCreateSectionData(*Section);
+
+ int64_t IntSubsection = 0;
+ if (Subsection &&
+ !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));
+}
+
+void MCObjectStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
+ getAssembler().getOrCreateSymbolData(*Symbol);
+ Symbol->setVariableValue(AddValueSymbols(Value));
}
void MCObjectStreamer::EmitInstruction(const MCInst &Inst) {
if (Inst.getOperand(i).isExpr())
AddValueSymbols(Inst.getOperand(i).getExpr());
- getCurrentSectionData()->setHasInstructions(true);
+ MCSectionData *SD = getCurrentSectionData();
+ SD->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.
- MCLineEntry::Make(this, getCurrentSection());
+ MCLineEntry::Make(this, getCurrentSection().first);
// If this instruction doesn't need relaxation, just emit it as data.
- if (!getAssembler().getBackend().MayNeedRelaxation(Inst)) {
+ MCAssembler &Assembler = getAssembler();
+ if (!Assembler.getBackend().mayNeedRelaxation(Inst)) {
EmitInstToData(Inst);
return;
}
- // Otherwise, if we are relaxing everything, relax the instruction as much as
- // possible and emit it as data.
- if (getAssembler().getRelaxAll()) {
+ // Otherwise, relax and emit it as data if either:
+ // - The RelaxAll flag was passed
+ // - Bundling is enabled and this instruction is inside a bundle-locked
+ // group. We want to emit all such instructions into the same data
+ // fragment.
+ if (Assembler.getRelaxAll() ||
+ (Assembler.isBundlingEnabled() && SD->isBundleLocked())) {
MCInst Relaxed;
- getAssembler().getBackend().RelaxInstruction(Inst, Relaxed);
- while (getAssembler().getBackend().MayNeedRelaxation(Relaxed))
- getAssembler().getBackend().RelaxInstruction(Relaxed, Relaxed);
+ getAssembler().getBackend().relaxInstruction(Inst, Relaxed);
+ while (getAssembler().getBackend().mayNeedRelaxation(Relaxed))
+ getAssembler().getBackend().relaxInstruction(Relaxed, Relaxed);
EmitInstToData(Relaxed);
return;
}
EmitInstToFragment(Inst);
}
-void MCObjectStreamer::Finish() {
+void MCObjectStreamer::EmitInstToFragment(const MCInst &Inst) {
+ // Always create a new, separate fragment here, because its size can change
+ // during relaxation.
+ MCRelaxableFragment *IF = new MCRelaxableFragment(Inst);
+ insert(IF);
+
+ SmallString<128> Code;
+ raw_svector_ostream VecOS(Code);
+ getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, IF->getFixups());
+ VecOS.flush();
+ IF->getContents().append(Code.begin(), Code.end());
+}
+
+#ifndef NDEBUG
+static const char *const BundlingNotImplementedMsg =
+ "Aligned bundling is not implemented for this object format";
+#endif
+
+void MCObjectStreamer::EmitBundleAlignMode(unsigned AlignPow2) {
+ llvm_unreachable(BundlingNotImplementedMsg);
+}
+
+void MCObjectStreamer::EmitBundleLock(bool AlignToEnd) {
+ llvm_unreachable(BundlingNotImplementedMsg);
+}
+
+void MCObjectStreamer::EmitBundleUnlock() {
+ llvm_unreachable(BundlingNotImplementedMsg);
+}
+
+void MCObjectStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
+ unsigned Column, unsigned Flags,
+ unsigned Isa,
+ unsigned Discriminator,
+ StringRef FileName) {
+ // In case we see two .loc directives in a row, make sure the
+ // first one gets a line entry.
+ MCLineEntry::Make(this, getCurrentSection().first);
+
+ this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
+ Isa, Discriminator, FileName);
+}
+
+void MCObjectStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
+ const MCSymbol *LastLabel,
+ const MCSymbol *Label,
+ unsigned PointerSize) {
+ if (!LastLabel) {
+ EmitDwarfSetLineAddr(LineDelta, Label, PointerSize);
+ return;
+ }
+ const MCExpr *AddrDelta = BuildSymbolDiff(getContext(), Label, LastLabel);
+ int64_t Res;
+ if (AddrDelta->EvaluateAsAbsolute(Res, getAssembler())) {
+ MCDwarfLineAddr::Emit(this, 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);
+ int64_t Res;
+ 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());
+}
+
+void MCObjectStreamer::EmitValueToAlignment(unsigned ByteAlignment,
+ int64_t Value,
+ unsigned ValueSize,
+ unsigned MaxBytesToEmit) {
+ if (MaxBytesToEmit == 0)
+ MaxBytesToEmit = 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);
+}
+
+void MCObjectStreamer::EmitCodeAlignment(unsigned ByteAlignment,
+ unsigned MaxBytesToEmit) {
+ EmitValueToAlignment(ByteAlignment, 0, 1, MaxBytesToEmit);
+ cast<MCAlignFragment>(getCurrentFragment())->setEmitNops(true);
+}
+
+bool 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;
+}
+
+// Associate GPRel32 fixup with data and resize data area
+void MCObjectStreamer::EmitGPRel32Value(const MCExpr *Value) {
+ MCDataFragment *DF = getOrCreateDataFragment();
+
+ 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();
+
+ 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);
+}
+
+void MCObjectStreamer::EmitZeros(uint64_t NumBytes) {
+ unsigned ItemSize = getCurrentSection().first->isVirtualSection() ? 0 : 1;
+ insert(new MCFillFragment(0, 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);
+
getAssembler().Finish();
}
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