//
//===----------------------------------------------------------------------===//
+#include "llvm/ADT/FoldingSet.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCDwarf.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/Twine.h"
#include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetAsmBackend.h"
#include "llvm/Target/TargetAsmInfo.h"
MCContext &context = streamer.getContext();
const TargetAsmInfo &asmInfo = context.getTargetAsmInfo();
int size = asmInfo.getPointerSize();
- if (asmInfo.getStackGrowthDirection() == TargetFrameInfo::StackGrowsUp)
+ if (asmInfo.getStackGrowthDirection() == TargetFrameLowering::StackGrowsUp)
return size;
else
return -size;
}
-/// EmitFrameMoves - Emit frame instructions to describe the layout of the
-/// frame.
-static void EmitFrameMoves(MCStreamer &streamer,
- const std::vector<MachineMove> &Moves,
- MCSymbol *BaseLabel, bool isEH) {
+static unsigned getSizeForEncoding(MCStreamer &streamer,
+ unsigned symbolEncoding) {
MCContext &context = streamer.getContext();
const TargetAsmInfo &asmInfo = context.getTargetAsmInfo();
- int dataAlignmentFactor = getDataAlignmentFactor(streamer);
+ unsigned format = symbolEncoding & 0x0f;
+ switch (format) {
+ default:
+ assert(0 && "Unknown Encoding");
+ case dwarf::DW_EH_PE_absptr:
+ case dwarf::DW_EH_PE_signed:
+ return asmInfo.getPointerSize();
+ case dwarf::DW_EH_PE_udata2:
+ case dwarf::DW_EH_PE_sdata2:
+ return 2;
+ case dwarf::DW_EH_PE_udata4:
+ case dwarf::DW_EH_PE_sdata4:
+ return 4;
+ case dwarf::DW_EH_PE_udata8:
+ case dwarf::DW_EH_PE_sdata8:
+ return 8;
+ }
+}
- for (unsigned i = 0, N = Moves.size(); i < N; ++i) {
- const MachineMove &Move = Moves[i];
- MCSymbol *Label = Move.getLabel();
- // Throw out move if the label is invalid.
- if (Label && !Label->isDefined()) continue; // Not emitted, in dead code.
+static void EmitSymbol(MCStreamer &streamer, const MCSymbol &symbol,
+ unsigned symbolEncoding) {
+ MCContext &context = streamer.getContext();
+ const MCAsmInfo &asmInfo = context.getAsmInfo();
+ const MCExpr *v = asmInfo.getExprForFDESymbol(&symbol,
+ symbolEncoding,
+ streamer);
+ unsigned size = getSizeForEncoding(streamer, symbolEncoding);
+ streamer.EmitAbsValue(v, size);
+}
- const MachineLocation &Dst = Move.getDestination();
- const MachineLocation &Src = Move.getSource();
+static void EmitPersonality(MCStreamer &streamer, const MCSymbol &symbol,
+ unsigned symbolEncoding) {
+ MCContext &context = streamer.getContext();
+ const MCAsmInfo &asmInfo = context.getAsmInfo();
+ const MCExpr *v = asmInfo.getExprForPersonalitySymbol(&symbol,
+ symbolEncoding,
+ streamer);
+ unsigned size = getSizeForEncoding(streamer, symbolEncoding);
+ streamer.EmitValue(v, size);
+}
- // Advance row if new location.
- if (BaseLabel && Label) {
- MCSymbol *ThisSym = Label;
- if (ThisSym != BaseLabel) {
- streamer.EmitIntValue(dwarf::DW_CFA_advance_loc4, 1);
- const MCExpr *Length = MakeStartMinusEndExpr(streamer, *BaseLabel,
- *ThisSym, 4);
- streamer.EmitValue(Length, 4);
- BaseLabel = ThisSym;
- }
+static const MachineLocation TranslateMachineLocation(
+ const TargetAsmInfo &AsmInfo,
+ const MachineLocation &Loc) {
+ unsigned Reg = Loc.getReg() == MachineLocation::VirtualFP ?
+ MachineLocation::VirtualFP :
+ unsigned(AsmInfo.getDwarfRegNum(Loc.getReg(), true));
+ const MachineLocation &NewLoc = Loc.isReg() ?
+ MachineLocation(Reg) : MachineLocation(Reg, Loc.getOffset());
+ return NewLoc;
+}
+
+namespace {
+ class FrameEmitterImpl {
+ int CFAOffset;
+ int CIENum;
+
+ public:
+ FrameEmitterImpl() : CFAOffset(0), CIENum(0) {
}
+ const MCSymbol &EmitCIE(MCStreamer &streamer,
+ const MCSymbol *personality,
+ unsigned personalityEncoding,
+ const MCSymbol *lsda,
+ unsigned lsdaEncoding);
+ MCSymbol *EmitFDE(MCStreamer &streamer,
+ const MCSymbol &cieStart,
+ const MCDwarfFrameInfo &frame,
+ bool forceLsda);
+ void EmitCFIInstructions(MCStreamer &streamer,
+ const std::vector<MCCFIInstruction> &Instrs,
+ MCSymbol *BaseLabel);
+ void EmitCFIInstruction(MCStreamer &Streamer,
+ const MCCFIInstruction &Instr);
+ };
+}
+
+void FrameEmitterImpl::EmitCFIInstruction(MCStreamer &Streamer,
+ const MCCFIInstruction &Instr) {
+ int dataAlignmentFactor = getDataAlignmentFactor(Streamer);
+
+ switch (Instr.getOperation()) {
+ case MCCFIInstruction::Move:
+ case MCCFIInstruction::RelMove: {
+ const MachineLocation &Dst = Instr.getDestination();
+ const MachineLocation &Src = Instr.getSource();
+ const bool IsRelative = Instr.getOperation() == MCCFIInstruction::RelMove;
+
// If advancing cfa.
if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) {
assert(!Src.isReg() && "Machine move not supported yet.");
if (Src.getReg() == MachineLocation::VirtualFP) {
- streamer.EmitIntValue(dwarf::DW_CFA_def_cfa_offset, 1);
+ Streamer.EmitIntValue(dwarf::DW_CFA_def_cfa_offset, 1);
} else {
- streamer.EmitIntValue(dwarf::DW_CFA_def_cfa, 1);
- streamer.EmitULEB128IntValue(asmInfo.getDwarfRegNum(Src.getReg(),
- isEH));
+ Streamer.EmitIntValue(dwarf::DW_CFA_def_cfa, 1);
+ Streamer.EmitULEB128IntValue(Src.getReg());
}
- streamer.EmitULEB128IntValue(-Src.getOffset(), 1);
- continue;
+ if (IsRelative)
+ CFAOffset += Src.getOffset();
+ else
+ CFAOffset = -Src.getOffset();
+
+ Streamer.EmitULEB128IntValue(CFAOffset);
+ return;
}
if (Src.isReg() && Src.getReg() == MachineLocation::VirtualFP) {
assert(Dst.isReg() && "Machine move not supported yet.");
- streamer.EmitIntValue(dwarf::DW_CFA_def_cfa_register, 1);
- streamer.EmitULEB128IntValue(asmInfo.getDwarfRegNum(Dst.getReg(), isEH));
- continue;
+ Streamer.EmitIntValue(dwarf::DW_CFA_def_cfa_register, 1);
+ Streamer.EmitULEB128IntValue(Dst.getReg());
+ return;
}
- unsigned Reg = asmInfo.getDwarfRegNum(Src.getReg(), isEH);
- int Offset = Dst.getOffset() / dataAlignmentFactor;
+ unsigned Reg = Src.getReg();
+
+ int Offset = Dst.getOffset();
+ if (IsRelative)
+ Offset -= CFAOffset;
+ Offset = Offset / dataAlignmentFactor;
if (Offset < 0) {
- streamer.EmitIntValue(dwarf::DW_CFA_offset_extended_sf, 1);
- streamer.EmitULEB128IntValue(Reg);
- streamer.EmitSLEB128IntValue(Offset);
+ Streamer.EmitIntValue(dwarf::DW_CFA_offset_extended_sf, 1);
+ Streamer.EmitULEB128IntValue(Reg);
+ Streamer.EmitSLEB128IntValue(Offset);
} else if (Reg < 64) {
- streamer.EmitIntValue(dwarf::DW_CFA_offset + Reg, 1);
- streamer.EmitULEB128IntValue(Offset, 1);
+ Streamer.EmitIntValue(dwarf::DW_CFA_offset + Reg, 1);
+ Streamer.EmitULEB128IntValue(Offset);
} else {
- streamer.EmitIntValue(dwarf::DW_CFA_offset_extended, 1);
- streamer.EmitULEB128IntValue(Reg, 1);
- streamer.EmitULEB128IntValue(Offset, 1);
+ Streamer.EmitIntValue(dwarf::DW_CFA_offset_extended, 1);
+ Streamer.EmitULEB128IntValue(Reg);
+ Streamer.EmitULEB128IntValue(Offset);
}
+ return;
}
+ case MCCFIInstruction::Remember:
+ Streamer.EmitIntValue(dwarf::DW_CFA_remember_state, 1);
+ return;
+ case MCCFIInstruction::Restore:
+ Streamer.EmitIntValue(dwarf::DW_CFA_restore_state, 1);
+ return;
+ case MCCFIInstruction::SameValue: {
+ unsigned Reg = Instr.getDestination().getReg();
+ Streamer.EmitIntValue(dwarf::DW_CFA_same_value, 1);
+ Streamer.EmitULEB128IntValue(Reg);
+ return;
+ }
+ }
+ llvm_unreachable("Unhandled case in switch");
}
-static const MCSymbol &EmitCIE(MCStreamer &streamer,
- const MCSymbol *personality) {
+/// EmitFrameMoves - Emit frame instructions to describe the layout of the
+/// frame.
+void FrameEmitterImpl::EmitCFIInstructions(MCStreamer &streamer,
+ const std::vector<MCCFIInstruction> &Instrs,
+ MCSymbol *BaseLabel) {
+ for (unsigned i = 0, N = Instrs.size(); i < N; ++i) {
+ const MCCFIInstruction &Instr = Instrs[i];
+ MCSymbol *Label = Instr.getLabel();
+ // Throw out move if the label is invalid.
+ if (Label && !Label->isDefined()) continue; // Not emitted, in dead code.
+
+ // Advance row if new location.
+ if (BaseLabel && Label) {
+ MCSymbol *ThisSym = Label;
+ if (ThisSym != BaseLabel) {
+ streamer.EmitDwarfAdvanceFrameAddr(BaseLabel, ThisSym);
+ BaseLabel = ThisSym;
+ }
+ }
+
+ EmitCFIInstruction(streamer, Instr);
+ }
+}
+
+const MCSymbol &FrameEmitterImpl::EmitCIE(MCStreamer &streamer,
+ const MCSymbol *personality,
+ unsigned personalityEncoding,
+ const MCSymbol *lsda,
+ unsigned lsdaEncoding) {
MCContext &context = streamer.getContext();
const TargetAsmInfo &asmInfo = context.getTargetAsmInfo();
const MCSection §ion = *asmInfo.getEHFrameSection();
streamer.SwitchSection(§ion);
- MCSymbol *sectionStart = streamer.getContext().CreateTempSymbol();
+
+ MCSymbol *sectionStart;
+ if (asmInfo.isFunctionEHFrameSymbolPrivate())
+ sectionStart = context.CreateTempSymbol();
+ else
+ sectionStart = context.GetOrCreateSymbol(Twine("EH_frame") + Twine(CIENum));
+
+ CIENum++;
+
MCSymbol *sectionEnd = streamer.getContext().CreateTempSymbol();
// Length
const MCExpr *Length = MakeStartMinusEndExpr(streamer, *sectionStart,
*sectionEnd, 4);
streamer.EmitLabel(sectionStart);
- streamer.EmitValue(Length, 4);
+ streamer.EmitAbsValue(Length, 4);
// CIE ID
streamer.EmitIntValue(0, 4);
Augmentation += "z";
if (personality)
Augmentation += "P";
+ if (lsda)
+ Augmentation += "L";
Augmentation += "R";
streamer.EmitBytes(Augmentation.str(), 0);
streamer.EmitIntValue(0, 1);
streamer.EmitULEB128IntValue(asmInfo.getDwarfRARegNum(true));
// Augmentation Data Length (optional)
- MCSymbol *augmentationStart = streamer.getContext().CreateTempSymbol();
- MCSymbol *augmentationEnd = streamer.getContext().CreateTempSymbol();
- const MCExpr *augmentationLength = MakeStartMinusEndExpr(streamer,
- *augmentationStart,
- *augmentationEnd, 0);
- streamer.EmitULEB128Value(augmentationLength);
+
+ unsigned augmentationLength = 0;
+ if (personality) {
+ // Personality Encoding
+ augmentationLength += 1;
+ // Personality
+ augmentationLength += getSizeForEncoding(streamer, personalityEncoding);
+ }
+ if (lsda) {
+ augmentationLength += 1;
+ }
+ // Encoding of the FDE pointers
+ augmentationLength += 1;
+
+ streamer.EmitULEB128IntValue(augmentationLength);
// Augmentation Data (optional)
- streamer.EmitLabel(augmentationStart);
if (personality) {
// Personality Encoding
- streamer.EmitIntValue(dwarf::DW_EH_PE_absptr, 1);
+ streamer.EmitIntValue(personalityEncoding, 1);
// Personality
- streamer.EmitSymbolValue(personality, asmInfo.getPointerSize());
+ EmitPersonality(streamer, *personality, personalityEncoding);
+ }
+ if (lsda) {
+ // LSDA Encoding
+ streamer.EmitIntValue(lsdaEncoding, 1);
}
// Encoding of the FDE pointers
- streamer.EmitIntValue(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4, 1);
- streamer.EmitLabel(augmentationEnd);
+ streamer.EmitIntValue(asmInfo.getFDEEncoding(), 1);
// Initial Instructions
const std::vector<MachineMove> Moves = asmInfo.getInitialFrameState();
+ std::vector<MCCFIInstruction> Instructions;
+
+ for (int i = 0, n = Moves.size(); i != n; ++i) {
+ MCSymbol *Label = Moves[i].getLabel();
+ const MachineLocation &Dst =
+ TranslateMachineLocation(asmInfo, Moves[i].getDestination());
+ const MachineLocation &Src =
+ TranslateMachineLocation(asmInfo, Moves[i].getSource());
+ MCCFIInstruction Inst(Label, Dst, Src);
+ Instructions.push_back(Inst);
+ }
- EmitFrameMoves(streamer, Moves, NULL, true);
+ EmitCFIInstructions(streamer, Instructions, NULL);
// Padding
streamer.EmitValueToAlignment(4);
return *sectionStart;
}
-static MCSymbol *EmitFDE(MCStreamer &streamer,
- const MCSymbol &cieStart,
- const MCDwarfFrameInfo &frame) {
- MCSymbol *fdeStart = streamer.getContext().CreateTempSymbol();
- MCSymbol *fdeEnd = streamer.getContext().CreateTempSymbol();
+MCSymbol *FrameEmitterImpl::EmitFDE(MCStreamer &streamer,
+ const MCSymbol &cieStart,
+ const MCDwarfFrameInfo &frame,
+ bool forceLsda) {
+ MCContext &context = streamer.getContext();
+ MCSymbol *fdeStart = context.CreateTempSymbol();
+ MCSymbol *fdeEnd = context.CreateTempSymbol();
+ const TargetAsmInfo &asmInfo = context.getTargetAsmInfo();
+
+ if (!asmInfo.isFunctionEHFrameSymbolPrivate()) {
+ Twine EHName = frame.Function->getName() + Twine(".eh");
+ MCSymbol *EHSym = context.GetOrCreateSymbol(EHName);
+ streamer.EmitEHSymAttributes(frame.Function, EHSym);
+ streamer.EmitLabel(EHSym);
+ }
// Length
const MCExpr *Length = MakeStartMinusEndExpr(streamer, *fdeStart, *fdeEnd, 0);
- streamer.EmitValue(Length, 4);
+ streamer.EmitAbsValue(Length, 4);
streamer.EmitLabel(fdeStart);
// CIE Pointer
const MCExpr *offset = MakeStartMinusEndExpr(streamer, cieStart, *fdeStart,
0);
- streamer.EmitValue(offset, 4);
+ streamer.EmitAbsValue(offset, 4);
+ unsigned fdeEncoding = asmInfo.getFDEEncoding();
+ unsigned size = getSizeForEncoding(streamer, fdeEncoding);
// PC Begin
- streamer.EmitPCRelSymbolValue(frame.Begin, 4);
+ EmitSymbol(streamer, *frame.Begin, fdeEncoding);
// PC Range
const MCExpr *Range = MakeStartMinusEndExpr(streamer, *frame.Begin,
*frame.End, 0);
- streamer.EmitValue(Range, 4);
+ streamer.EmitAbsValue(Range, size);
// Augmentation Data Length
- streamer.EmitULEB128IntValue(0);
+ unsigned augmentationLength = 0;
+
+ if (frame.Lsda || forceLsda)
+ augmentationLength += getSizeForEncoding(streamer, frame.LsdaEncoding);
+
+ streamer.EmitULEB128IntValue(augmentationLength);
// Augmentation Data
+
+ // When running in "CodeGen compatibility mode" a FDE with no LSDA can be
+ // assigned to a CIE that requires one. In that case we output a 0 (as does
+ // CodeGen).
+ if (frame.Lsda)
+ EmitSymbol(streamer, *frame.Lsda, frame.LsdaEncoding);
+ else if (forceLsda)
+ streamer.EmitIntValue(0, getSizeForEncoding(streamer, frame.LsdaEncoding));
+
// Call Frame Instructions
+ EmitCFIInstructions(streamer, frame.Instructions, frame.Begin);
+
// Padding
- streamer.EmitValueToAlignment(4);
+ streamer.EmitValueToAlignment(size);
return fdeEnd;
}
+namespace {
+ struct CIEKey {
+ static const CIEKey getEmptyKey() { return CIEKey(0, 0, -1); }
+ static const CIEKey getTombstoneKey() { return CIEKey(0, -1, 0); }
+
+ CIEKey(const MCSymbol* Personality_, unsigned PersonalityEncoding_,
+ unsigned LsdaEncoding_) : Personality(Personality_),
+ PersonalityEncoding(PersonalityEncoding_),
+ LsdaEncoding(LsdaEncoding_) {
+ }
+ const MCSymbol* Personality;
+ unsigned PersonalityEncoding;
+ unsigned LsdaEncoding;
+ };
+}
+
+namespace llvm {
+ template <>
+ struct DenseMapInfo<CIEKey> {
+ static CIEKey getEmptyKey() {
+ return CIEKey::getEmptyKey();
+ }
+ static CIEKey getTombstoneKey() {
+ return CIEKey::getTombstoneKey();
+ }
+ static unsigned getHashValue(const CIEKey &Key) {
+ FoldingSetNodeID ID;
+ ID.AddPointer(Key.Personality);
+ ID.AddInteger(Key.PersonalityEncoding);
+ ID.AddInteger(Key.LsdaEncoding);
+ return ID.ComputeHash();
+ }
+ static bool isEqual(const CIEKey &LHS,
+ const CIEKey &RHS) {
+ return LHS.Personality == RHS.Personality &&
+ LHS.PersonalityEncoding == RHS.PersonalityEncoding &&
+ LHS.LsdaEncoding == RHS.LsdaEncoding;
+ }
+ };
+}
+
+// This is an implementation of CIE and FDE emission that is bug by bug
+// compatible with the one in CodeGen. It is useful during the transition
+// to make it easy to compare the outputs, but should probably be removed
+// afterwards.
+void MCDwarfFrameEmitter::EmitDarwin(MCStreamer &streamer) {
+ FrameEmitterImpl Emitter;
+ DenseMap<const MCSymbol*, const MCSymbol*> Personalities;
+ const MCSymbol *aCIE = NULL;
+ const MCDwarfFrameInfo *aFrame = NULL;
+
+ for (unsigned i = 0, n = streamer.getNumFrameInfos(); i < n; ++i) {
+ const MCDwarfFrameInfo &frame = streamer.getFrameInfo(i);
+ if (!frame.Personality)
+ continue;
+ if (Personalities.count(frame.Personality))
+ continue;
+
+ const MCSymbol *cieStart = &Emitter.EmitCIE(streamer, frame.Personality,
+ frame.PersonalityEncoding,
+ frame.Lsda,
+ frame.LsdaEncoding);
+ aCIE = cieStart;
+ aFrame = &frame;
+ Personalities[frame.Personality] = cieStart;
+ }
+
+ if (Personalities.empty()) {
+ const MCDwarfFrameInfo &frame = streamer.getFrameInfo(0);
+ aCIE = &Emitter.EmitCIE(streamer, frame.Personality,
+ frame.PersonalityEncoding, frame.Lsda,
+ frame.LsdaEncoding);
+ aFrame = &frame;
+ }
+
+ MCSymbol *fdeEnd = NULL;
+ for (unsigned i = 0, n = streamer.getNumFrameInfos(); i < n; ++i) {
+ const MCDwarfFrameInfo &frame = streamer.getFrameInfo(i);
+ const MCSymbol *cieStart = Personalities[frame.Personality];
+ bool hasLSDA;
+ if (!cieStart) {
+ cieStart = aCIE;
+ hasLSDA = aFrame->Lsda;
+ } else {
+ hasLSDA = true;
+ }
+
+ fdeEnd = Emitter.EmitFDE(streamer, *cieStart, frame,
+ hasLSDA);
+ if (i != n - 1)
+ streamer.EmitLabel(fdeEnd);
+ }
+
+ const MCContext &context = streamer.getContext();
+ const TargetAsmInfo &asmInfo = context.getTargetAsmInfo();
+ streamer.EmitValueToAlignment(asmInfo.getPointerSize());
+ if (fdeEnd)
+ streamer.EmitLabel(fdeEnd);
+}
+
void MCDwarfFrameEmitter::Emit(MCStreamer &streamer) {
const MCContext &context = streamer.getContext();
const TargetAsmInfo &asmInfo = context.getTargetAsmInfo();
+ if (!asmInfo.isFunctionEHFrameSymbolPrivate()) {
+ EmitDarwin(streamer);
+ return;
+ }
+
MCSymbol *fdeEnd = NULL;
- DenseMap<const MCSymbol*, const MCSymbol*> Personalities;
+ DenseMap<CIEKey, const MCSymbol*> CIEStarts;
+ FrameEmitterImpl Emitter;
for (unsigned i = 0, n = streamer.getNumFrameInfos(); i < n; ++i) {
const MCDwarfFrameInfo &frame = streamer.getFrameInfo(i);
- const MCSymbol *&cieStart = Personalities[frame.Personality];
+ CIEKey key(frame.Personality, frame.PersonalityEncoding,
+ frame.LsdaEncoding);
+ const MCSymbol *&cieStart = CIEStarts[key];
if (!cieStart)
- cieStart = &EmitCIE(streamer, frame.Personality);
- fdeEnd = EmitFDE(streamer, *cieStart, frame);
+ cieStart = &Emitter.EmitCIE(streamer, frame.Personality,
+ frame.PersonalityEncoding, frame.Lsda,
+ frame.LsdaEncoding);
+ fdeEnd = Emitter.EmitFDE(streamer, *cieStart, frame, false);
if (i != n - 1)
streamer.EmitLabel(fdeEnd);
}
if (fdeEnd)
streamer.EmitLabel(fdeEnd);
}
+
+void MCDwarfFrameEmitter::EmitAdvanceLoc(MCStreamer &Streamer,
+ uint64_t AddrDelta) {
+ SmallString<256> Tmp;
+ raw_svector_ostream OS(Tmp);
+ const TargetAsmInfo &AsmInfo = Streamer.getContext().getTargetAsmInfo();
+ MCDwarfFrameEmitter::EncodeAdvanceLoc(AddrDelta, OS, AsmInfo);
+ Streamer.EmitBytes(OS.str(), /*AddrSpace=*/0);
+}
+
+void MCDwarfFrameEmitter::EncodeAdvanceLoc(uint64_t AddrDelta,
+ raw_ostream &OS,
+ const TargetAsmInfo &AsmInfo) {
+ // This is a small hack to facilitate the transition to CFI on OS X. It
+ // relaxes all address advances which lets us produces identical output
+ // to the one produce by CodeGen.
+ const bool Relax = !AsmInfo.isFunctionEHFrameSymbolPrivate();
+
+ // FIXME: Assumes the code alignment factor is 1.
+ if (AddrDelta == 0) {
+ } else if (isUIntN(6, AddrDelta) && !Relax) {
+ uint8_t Opcode = dwarf::DW_CFA_advance_loc | AddrDelta;
+ OS << Opcode;
+ } else if (isUInt<8>(AddrDelta) && !Relax) {
+ OS << uint8_t(dwarf::DW_CFA_advance_loc1);
+ OS << uint8_t(AddrDelta);
+ } else if (isUInt<16>(AddrDelta) && !Relax) {
+ // FIXME: check what is the correct behavior on a big endian machine.
+ OS << uint8_t(dwarf::DW_CFA_advance_loc2);
+ OS << uint8_t( AddrDelta & 0xff);
+ OS << uint8_t((AddrDelta >> 8) & 0xff);
+ } else {
+ // FIXME: check what is the correct behavior on a big endian machine.
+ assert(isUInt<32>(AddrDelta));
+ OS << uint8_t(dwarf::DW_CFA_advance_loc4);
+ OS << uint8_t( AddrDelta & 0xff);
+ OS << uint8_t((AddrDelta >> 8) & 0xff);
+ OS << uint8_t((AddrDelta >> 16) & 0xff);
+ OS << uint8_t((AddrDelta >> 24) & 0xff);
+
+ }
+}
projects / oota-llvm.git / blobdiff