X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FMC%2FMCStreamer.cpp;h=ab7e4c75768b6f745ff08621a9138dc0bd481b97;hb=9456c7b20af9933014b68767762f51ab6f91583c;hp=974e885aacd0c642b3a137ab2aad752d32a7c4e2;hpb=c4cbf9b6aa95cf861a5a80bfccf615ff5c53e4ef;p=oota-llvm.git diff --git a/lib/MC/MCStreamer.cpp b/lib/MC/MCStreamer.cpp index 974e885aacd..ab7e4c75768 100644 --- a/lib/MC/MCStreamer.cpp +++ b/lib/MC/MCStreamer.cpp @@ -7,24 +7,38 @@ // //===----------------------------------------------------------------------===// +#include "llvm/MC/MCStreamer.h" +#include "llvm/ADT/SmallString.h" +#include "llvm/ADT/Twine.h" +#include "llvm/MC/MCAsmBackend.h" #include "llvm/MC/MCAsmInfo.h" #include "llvm/MC/MCContext.h" -#include "llvm/MC/MCStreamer.h" #include "llvm/MC/MCExpr.h" +#include "llvm/MC/MCObjectFileInfo.h" #include "llvm/MC/MCObjectWriter.h" #include "llvm/MC/MCSymbol.h" #include "llvm/Support/ErrorHandling.h" +#include "llvm/Support/LEB128.h" #include "llvm/Support/raw_ostream.h" -#include "llvm/ADT/SmallString.h" -#include "llvm/ADT/Twine.h" #include using namespace llvm; -MCStreamer::MCStreamer(MCContext &Ctx) : Context(Ctx), EmitEHFrame(true), - EmitDebugFrame(false), - CurrentW64UnwindInfo(0) { - const MCSection *section = NULL; - SectionStack.push_back(std::make_pair(section, section)); +// Pin the vtables to this file. +MCTargetStreamer::~MCTargetStreamer() {} + +MCTargetStreamer::MCTargetStreamer(MCStreamer &S) : Streamer(S) { + S.setTargetStreamer(this); +} + +void MCTargetStreamer::emitLabel(MCSymbol *Symbol) {} + +void MCTargetStreamer::finish() {} + +void MCTargetStreamer::emitAssignment(MCSymbol *Symbol, const MCExpr *Value) {} + +MCStreamer::MCStreamer(MCContext &Ctx) + : Context(Ctx), CurrentW64UnwindInfo(nullptr) { + SectionStack.push_back(std::pair()); } MCStreamer::~MCStreamer() { @@ -32,6 +46,15 @@ MCStreamer::~MCStreamer() { delete W64UnwindInfos[i]; } +void MCStreamer::reset() { + for (unsigned i = 0; i < getNumW64UnwindInfos(); ++i) + delete W64UnwindInfos[i]; + W64UnwindInfos.clear(); + CurrentW64UnwindInfo = nullptr; + SectionStack.clear(); + SectionStack.push_back(std::pair()); +} + const MCExpr *MCStreamer::BuildSymbolDiff(MCContext &Context, const MCSymbol *A, const MCSymbol *B) { @@ -46,8 +69,8 @@ const MCExpr *MCStreamer::BuildSymbolDiff(MCContext &Context, } const MCExpr *MCStreamer::ForceExpAbs(const MCExpr* Expr) { - if (Context.getAsmInfo().hasAggressiveSymbolFolding() || - isa(Expr)) + assert(!isa(Expr)); + if (Context.getAsmInfo()->hasAggressiveSymbolFolding()) return Expr; MCSymbol *ABS = Context.CreateTempSymbol(); @@ -60,6 +83,15 @@ raw_ostream &MCStreamer::GetCommentOS() { return nulls(); } +void MCStreamer::emitRawComment(const Twine &T, bool TabPrefix) {} + +void MCStreamer::generateCompactUnwindEncodings(MCAsmBackend *MAB) { + for (std::vector::iterator I = FrameInfos.begin(), + E = FrameInfos.end(); I != E; ++I) + I->CompactUnwindEncoding = + (MAB ? MAB->generateCompactUnwindEncoding(I->Instructions) : 0); +} + void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta, const MCSymbol *Label, int PointerSize) { // emit the sequence to set the address @@ -74,52 +106,54 @@ void MCStreamer::EmitDwarfSetLineAddr(int64_t LineDelta, /// EmitIntValue - Special case of EmitValue that avoids the client having to /// pass in a MCExpr for constant integers. -void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size, - unsigned AddrSpace) { +void MCStreamer::EmitIntValue(uint64_t Value, unsigned Size) { assert(Size <= 8 && "Invalid size"); assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) && "Invalid size"); char buf[8]; - // FIXME: Endianness assumption. - for (unsigned i = 0; i != Size; ++i) - buf[i] = uint8_t(Value >> (i * 8)); - EmitBytes(StringRef(buf, Size), AddrSpace); + const bool isLittleEndian = Context.getAsmInfo()->isLittleEndian(); + for (unsigned i = 0; i != Size; ++i) { + unsigned index = isLittleEndian ? i : (Size - i - 1); + buf[i] = uint8_t(Value >> (index * 8)); + } + EmitBytes(StringRef(buf, Size)); } /// EmitULEB128Value - Special case of EmitULEB128Value that avoids the /// client having to pass in a MCExpr for constant integers. -void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned AddrSpace) { - SmallString<32> Tmp; +void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned Padding) { + SmallString<128> Tmp; raw_svector_ostream OSE(Tmp); - MCObjectWriter::EncodeULEB128(Value, OSE); - EmitBytes(OSE.str(), AddrSpace); + encodeULEB128(Value, OSE, Padding); + EmitBytes(OSE.str()); } /// EmitSLEB128Value - Special case of EmitSLEB128Value that avoids the /// client having to pass in a MCExpr for constant integers. -void MCStreamer::EmitSLEB128IntValue(int64_t Value, unsigned AddrSpace) { - SmallString<32> Tmp; +void MCStreamer::EmitSLEB128IntValue(int64_t Value) { + SmallString<128> Tmp; raw_svector_ostream OSE(Tmp); - MCObjectWriter::EncodeSLEB128(Value, OSE); - EmitBytes(OSE.str(), AddrSpace); + encodeSLEB128(Value, OSE); + EmitBytes(OSE.str()); } -void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size, - unsigned AddrSpace) { +void MCStreamer::EmitAbsValue(const MCExpr *Value, unsigned Size) { const MCExpr *ABS = ForceExpAbs(Value); - EmitValue(ABS, Size, AddrSpace); + EmitValue(ABS, Size); } void MCStreamer::EmitValue(const MCExpr *Value, unsigned Size, - unsigned AddrSpace) { - EmitValueImpl(Value, Size, AddrSpace); + const SMLoc &Loc) { + EmitValueImpl(Value, Size, Loc); +} + +void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size) { + EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size); } -void MCStreamer::EmitSymbolValue(const MCSymbol *Sym, unsigned Size, - unsigned AddrSpace) { - EmitValueImpl(MCSymbolRefExpr::Create(Sym, getContext()), Size, - AddrSpace); +void MCStreamer::EmitGPRel64Value(const MCExpr *Value) { + report_fatal_error("unsupported directive in streamer"); } void MCStreamer::EmitGPRel32Value(const MCExpr *Value) { @@ -128,16 +162,21 @@ void MCStreamer::EmitGPRel32Value(const MCExpr *Value) { /// EmitFill - Emit NumBytes bytes worth of the value specified by /// FillValue. This implements directives such as '.space'. -void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue, - unsigned AddrSpace) { +void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue) { const MCExpr *E = MCConstantExpr::Create(FillValue, getContext()); for (uint64_t i = 0, e = NumBytes; i != e; ++i) - EmitValue(E, 1, AddrSpace); + EmitValue(E, 1); +} + +/// The implementation in this class just redirects to EmitFill. +void MCStreamer::EmitZeros(uint64_t NumBytes) { + EmitFill(NumBytes, 0); } -bool MCStreamer::EmitDwarfFileDirective(unsigned FileNo, - StringRef Filename) { - return getContext().GetDwarfFile(Filename, FileNo) == 0; +unsigned MCStreamer::EmitDwarfFileDirective(unsigned FileNo, + StringRef Directory, + StringRef Filename, unsigned CUID) { + return getContext().GetDwarfFile(Directory, Filename, FileNo, CUID); } void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line, @@ -149,9 +188,19 @@ void MCStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line, Discriminator); } +MCSymbol *MCStreamer::getDwarfLineTableSymbol(unsigned CUID) { + MCDwarfLineTable &Table = getContext().getMCDwarfLineTable(CUID); + if (!Table.getLabel()) { + StringRef Prefix = Context.getAsmInfo()->getPrivateGlobalPrefix(); + Table.setLabel( + Context.GetOrCreateSymbol(Prefix + "line_table_start" + Twine(CUID))); + } + return Table.getLabel(); +} + MCDwarfFrameInfo *MCStreamer::getCurrentFrameInfo() { if (FrameInfos.empty()) - return NULL; + return nullptr; return &FrameInfos.back(); } @@ -165,103 +214,120 @@ void MCStreamer::EmitEHSymAttributes(const MCSymbol *Symbol, MCSymbol *EHSymbol) { } +void MCStreamer::InitSections() { + SwitchSection(getContext().getObjectFileInfo()->getTextSection()); +} + +void MCStreamer::AssignSection(MCSymbol *Symbol, const MCSection *Section) { + if (Section) + Symbol->setSection(*Section); + else + Symbol->setUndefined(); + + // As we emit symbols into a section, track the order so that they can + // be sorted upon later. Zero is reserved to mean 'unemitted'. + SymbolOrdering[Symbol] = 1 + SymbolOrdering.size(); +} + void MCStreamer::EmitLabel(MCSymbol *Symbol) { assert(!Symbol->isVariable() && "Cannot emit a variable symbol!"); - assert(getCurrentSection() && "Cannot emit before setting section!"); - Symbol->setSection(*getCurrentSection()); + assert(getCurrentSection().first && "Cannot emit before setting section!"); + AssignSection(Symbol, getCurrentSection().first); - StringRef Prefix = getContext().getAsmInfo().getPrivateGlobalPrefix(); - if (!Symbol->getName().startswith(Prefix)) - LastNonPrivate = Symbol; + MCTargetStreamer *TS = getTargetStreamer(); + if (TS) + TS->emitLabel(Symbol); +} + +void MCStreamer::EmitCompactUnwindEncoding(uint32_t CompactUnwindEncoding) { + EnsureValidFrame(); + MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); + CurFrame->CompactUnwindEncoding = CompactUnwindEncoding; } void MCStreamer::EmitCFISections(bool EH, bool Debug) { assert(EH || Debug); - EmitEHFrame = EH; - EmitDebugFrame = Debug; } -void MCStreamer::EmitCFIStartProc() { +void MCStreamer::EmitCFIStartProc(bool IsSimple) { MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); if (CurFrame && !CurFrame->End) report_fatal_error("Starting a frame before finishing the previous one!"); + MCDwarfFrameInfo Frame; - Frame.Begin = getContext().CreateTempSymbol(); - Frame.Function = LastNonPrivate; - EmitLabel(Frame.Begin); + Frame.IsSimple = IsSimple; + EmitCFIStartProcImpl(Frame); + FrameInfos.push_back(Frame); } +void MCStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) { +} + void MCStreamer::EmitCFIEndProc() { EnsureValidFrame(); MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); - CurFrame->End = getContext().CreateTempSymbol(); - EmitLabel(CurFrame->End); + EmitCFIEndProcImpl(*CurFrame); } -void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) { +void MCStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) { + // Put a dummy non-null value in Frame.End to mark that this frame has been + // closed. + Frame.End = (MCSymbol *) 1; +} + +MCSymbol *MCStreamer::EmitCFICommon() { EnsureValidFrame(); - MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); MCSymbol *Label = getContext().CreateTempSymbol(); EmitLabel(Label); - MachineLocation Dest(MachineLocation::VirtualFP); - MachineLocation Source(Register, -Offset); - MCCFIInstruction Instruction(Label, Dest, Source); + return Label; +} + +void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) { + MCSymbol *Label = EmitCFICommon(); + MCCFIInstruction Instruction = + MCCFIInstruction::createDefCfa(Label, Register, Offset); + MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); CurFrame->Instructions.push_back(Instruction); } void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) { - EnsureValidFrame(); + MCSymbol *Label = EmitCFICommon(); + MCCFIInstruction Instruction = + MCCFIInstruction::createDefCfaOffset(Label, Offset); MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); - MCSymbol *Label = getContext().CreateTempSymbol(); - EmitLabel(Label); - MachineLocation Dest(MachineLocation::VirtualFP); - MachineLocation Source(MachineLocation::VirtualFP, -Offset); - MCCFIInstruction Instruction(Label, Dest, Source); CurFrame->Instructions.push_back(Instruction); } void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) { - EnsureValidFrame(); + MCSymbol *Label = EmitCFICommon(); + MCCFIInstruction Instruction = + MCCFIInstruction::createAdjustCfaOffset(Label, Adjustment); MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); - MCSymbol *Label = getContext().CreateTempSymbol(); - EmitLabel(Label); - MachineLocation Dest(MachineLocation::VirtualFP); - MachineLocation Source(MachineLocation::VirtualFP, Adjustment); - MCCFIInstruction Instruction(MCCFIInstruction::RelMove, Label, Dest, Source); CurFrame->Instructions.push_back(Instruction); } void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) { - EnsureValidFrame(); + MCSymbol *Label = EmitCFICommon(); + MCCFIInstruction Instruction = + MCCFIInstruction::createDefCfaRegister(Label, Register); MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); - MCSymbol *Label = getContext().CreateTempSymbol(); - EmitLabel(Label); - MachineLocation Dest(Register); - MachineLocation Source(MachineLocation::VirtualFP); - MCCFIInstruction Instruction(Label, Dest, Source); CurFrame->Instructions.push_back(Instruction); } void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) { - EnsureValidFrame(); + MCSymbol *Label = EmitCFICommon(); + MCCFIInstruction Instruction = + MCCFIInstruction::createOffset(Label, Register, Offset); MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); - MCSymbol *Label = getContext().CreateTempSymbol(); - EmitLabel(Label); - MachineLocation Dest(Register, Offset); - MachineLocation Source(Register, Offset); - MCCFIInstruction Instruction(Label, Dest, Source); CurFrame->Instructions.push_back(Instruction); } void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) { - EnsureValidFrame(); + MCSymbol *Label = EmitCFICommon(); + MCCFIInstruction Instruction = + MCCFIInstruction::createRelOffset(Label, Register, Offset); MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); - MCSymbol *Label = getContext().CreateTempSymbol(); - EmitLabel(Label); - MachineLocation Dest(Register, Offset); - MachineLocation Source(Register, Offset); - MCCFIInstruction Instruction(MCCFIInstruction::RelMove, Label, Dest, Source); CurFrame->Instructions.push_back(Instruction); } @@ -281,30 +347,70 @@ void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) { } void MCStreamer::EmitCFIRememberState() { - EnsureValidFrame(); + MCSymbol *Label = EmitCFICommon(); + MCCFIInstruction Instruction = MCCFIInstruction::createRememberState(Label); MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); - MCSymbol *Label = getContext().CreateTempSymbol(); - EmitLabel(Label); - MCCFIInstruction Instruction(MCCFIInstruction::Remember, Label); CurFrame->Instructions.push_back(Instruction); } void MCStreamer::EmitCFIRestoreState() { // FIXME: Error if there is no matching cfi_remember_state. - EnsureValidFrame(); + MCSymbol *Label = EmitCFICommon(); + MCCFIInstruction Instruction = MCCFIInstruction::createRestoreState(Label); MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); - MCSymbol *Label = getContext().CreateTempSymbol(); - EmitLabel(Label); - MCCFIInstruction Instruction(MCCFIInstruction::Restore, Label); CurFrame->Instructions.push_back(Instruction); } void MCStreamer::EmitCFISameValue(int64_t Register) { + MCSymbol *Label = EmitCFICommon(); + MCCFIInstruction Instruction = + MCCFIInstruction::createSameValue(Label, Register); + MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); + CurFrame->Instructions.push_back(Instruction); +} + +void MCStreamer::EmitCFIRestore(int64_t Register) { + MCSymbol *Label = EmitCFICommon(); + MCCFIInstruction Instruction = + MCCFIInstruction::createRestore(Label, Register); + MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); + CurFrame->Instructions.push_back(Instruction); +} + +void MCStreamer::EmitCFIEscape(StringRef Values) { + MCSymbol *Label = EmitCFICommon(); + MCCFIInstruction Instruction = MCCFIInstruction::createEscape(Label, Values); + MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); + CurFrame->Instructions.push_back(Instruction); +} + +void MCStreamer::EmitCFISignalFrame() { EnsureValidFrame(); MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); - MCSymbol *Label = getContext().CreateTempSymbol(); - EmitLabel(Label); - MCCFIInstruction Instruction(MCCFIInstruction::SameValue, Label, Register); + CurFrame->IsSignalFrame = true; +} + +void MCStreamer::EmitCFIUndefined(int64_t Register) { + MCSymbol *Label = EmitCFICommon(); + MCCFIInstruction Instruction = + MCCFIInstruction::createUndefined(Label, Register); + MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); + CurFrame->Instructions.push_back(Instruction); +} + +void MCStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) { + MCSymbol *Label = EmitCFICommon(); + MCCFIInstruction Instruction = + MCCFIInstruction::createRegister(Label, Register1, Register2); + MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); + CurFrame->Instructions.push_back(Instruction); +} + +void MCStreamer::EmitCFIWindowSave() { + MCSymbol *Label = EmitCFICommon(); + MCCFIInstruction Instruction = + MCCFIInstruction::createWindowSave(Label); + MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo(); CurFrame->Instructions.push_back(Instruction); } @@ -398,7 +504,11 @@ void MCStreamer::EmitWin64EHSetFrame(unsigned Register, unsigned Offset) { report_fatal_error("Frame register and offset already specified!"); if (Offset & 0x0F) report_fatal_error("Misaligned frame pointer offset!"); - MCWin64EHInstruction Inst(Win64EH::UOP_SetFPReg, NULL, Register, Offset); + if (Offset > 240) + report_fatal_error("Frame offset must be less than or equal to 240!"); + MCSymbol *Label = getContext().CreateTempSymbol(); + MCWin64EHInstruction Inst(Win64EH::UOP_SetFPReg, Label, Register, Offset); + EmitLabel(Label); CurFrame->LastFrameInst = CurFrame->Instructions.size(); CurFrame->Instructions.push_back(Inst); } @@ -458,50 +568,16 @@ void MCStreamer::EmitWin64EHEndProlog() { EmitLabel(CurFrame->PrologEnd); } -void MCStreamer::EmitFnStart() { - errs() << "Not implemented yet\n"; - abort(); -} - -void MCStreamer::EmitFnEnd() { - errs() << "Not implemented yet\n"; - abort(); -} - -void MCStreamer::EmitCantUnwind() { - errs() << "Not implemented yet\n"; - abort(); -} - -void MCStreamer::EmitHandlerData() { - errs() << "Not implemented yet\n"; - abort(); -} - -void MCStreamer::EmitPersonality(const MCSymbol *Personality) { - errs() << "Not implemented yet\n"; - abort(); -} - -void MCStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) { - errs() << "Not implemented yet\n"; - abort(); +void MCStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) { } -void MCStreamer::EmitPad(int64_t Offset) { - errs() << "Not implemented yet\n"; - abort(); -} - -void MCStreamer::EmitRegSave(const SmallVectorImpl &RegList, bool) { - errs() << "Not implemented yet\n"; - abort(); +void MCStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) { } /// EmitRawText - If this file is backed by an assembly streamer, this dumps /// the specified string in the output .s file. This capability is /// indicated by the hasRawTextSupport() predicate. -void MCStreamer::EmitRawText(StringRef String) { +void MCStreamer::EmitRawTextImpl(StringRef String) { errs() << "EmitRawText called on an MCStreamer that doesn't support it, " " something must not be fully mc'ized\n"; abort(); @@ -509,19 +585,7 @@ void MCStreamer::EmitRawText(StringRef String) { void MCStreamer::EmitRawText(const Twine &T) { SmallString<128> Str; - T.toVector(Str); - EmitRawText(Str.str()); -} - -void MCStreamer::EmitFrames(bool usingCFI) { - if (!getNumFrameInfos()) - return; - - if (EmitEHFrame) - MCDwarfFrameEmitter::Emit(*this, usingCFI, true); - - if (EmitDebugFrame) - MCDwarfFrameEmitter::Emit(*this, usingCFI, false); + EmitRawTextImpl(T.toStringRef(Str)); } void MCStreamer::EmitW64Tables() { @@ -530,3 +594,95 @@ void MCStreamer::EmitW64Tables() { MCWin64EHUnwindEmitter::Emit(*this); } + +void MCStreamer::Finish() { + if (!FrameInfos.empty() && !FrameInfos.back().End) + report_fatal_error("Unfinished frame!"); + + MCTargetStreamer *TS = getTargetStreamer(); + if (TS) + TS->finish(); + + FinishImpl(); +} + +void MCStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) { + visitUsedExpr(*Value); + Symbol->setVariableValue(Value); + + MCTargetStreamer *TS = getTargetStreamer(); + if (TS) + TS->emitAssignment(Symbol, Value); +} + +void MCStreamer::visitUsedSymbol(const MCSymbol &Sym) { +} + +void MCStreamer::visitUsedExpr(const MCExpr &Expr) { + switch (Expr.getKind()) { + case MCExpr::Target: + cast(Expr).visitUsedExpr(*this); + break; + + case MCExpr::Constant: + break; + + case MCExpr::Binary: { + const MCBinaryExpr &BE = cast(Expr); + visitUsedExpr(*BE.getLHS()); + visitUsedExpr(*BE.getRHS()); + break; + } + + case MCExpr::SymbolRef: + visitUsedSymbol(cast(Expr).getSymbol()); + break; + + case MCExpr::Unary: + visitUsedExpr(*cast(Expr).getSubExpr()); + break; + } +} + +void MCStreamer::EmitInstruction(const MCInst &Inst, + const MCSubtargetInfo &STI) { + // Scan for values. + for (unsigned i = Inst.getNumOperands(); i--;) + if (Inst.getOperand(i).isExpr()) + visitUsedExpr(*Inst.getOperand(i).getExpr()); +} + +void MCStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {} +void MCStreamer::EmitThumbFunc(MCSymbol *Func) {} +void MCStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {} +void MCStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {} +void MCStreamer::EndCOFFSymbolDef() {} +void MCStreamer::EmitFileDirective(StringRef Filename) {} +void MCStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {} +void MCStreamer::EmitCOFFSymbolType(int Type) {} +void MCStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {} +void MCStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size, + unsigned ByteAlignment) {} +void MCStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol, + uint64_t Size, unsigned ByteAlignment) {} +void MCStreamer::ChangeSection(const MCSection *, const MCExpr *) {} +void MCStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {} +void MCStreamer::EmitBytes(StringRef Data) {} +void MCStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size, + const SMLoc &Loc) { + visitUsedExpr(*Value); +} +void MCStreamer::EmitULEB128Value(const MCExpr *Value) {} +void MCStreamer::EmitSLEB128Value(const MCExpr *Value) {} +void MCStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value, + unsigned ValueSize, + unsigned MaxBytesToEmit) {} +void MCStreamer::EmitCodeAlignment(unsigned ByteAlignment, + unsigned MaxBytesToEmit) {} +bool MCStreamer::EmitValueToOffset(const MCExpr *Offset, unsigned char Value) { + return false; +} +void MCStreamer::EmitBundleAlignMode(unsigned AlignPow2) {} +void MCStreamer::EmitBundleLock(bool AlignToEnd) {} +void MCStreamer::FinishImpl() {} +void MCStreamer::EmitBundleUnlock() {}