#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"
#define SPECIAL_ADDR(op) (((op) - DWARF2_LINE_OPCODE_BASE)/DWARF2_LINE_RANGE)
// The maximum address skip amount that can be encoded with a special op.
-#define MAX_SPECIAL_ADDR_DELTA SPECIAL_ADDR(255)
+#define MAX_SPECIAL_ADDR_DELTA SPECIAL_ADDR(255)
// First special line opcode - leave room for the standard opcodes.
// Note: If you want to change this, you'll have to update the
// "standard_opcode_lengths" table that is emitted in DwarfFileTable::Emit().
-#define DWARF2_LINE_OPCODE_BASE 13
+#define DWARF2_LINE_OPCODE_BASE 13
// Minimum line offset in a special line info. opcode. This value
// was chosen to give a reasonable range of values.
-#define DWARF2_LINE_BASE -5
+#define DWARF2_LINE_BASE -5
// Range of line offsets in a special line info. opcode.
-# define DWARF2_LINE_RANGE 14
+#define DWARF2_LINE_RANGE 14
// Define the architecture-dependent minimum instruction length (in bytes).
// This value should be rather too small than too big.
-# define DWARF2_LINE_MIN_INSN_LENGTH 1
+#define DWARF2_LINE_MIN_INSN_LENGTH 1
// Note: when DWARF2_LINE_MIN_INSN_LENGTH == 1 which is the current setting,
// this routine is a nop and will be optimized away.
-static inline uint64_t ScaleAddrDelta(uint64_t AddrDelta)
-{
+static inline uint64_t ScaleAddrDelta(uint64_t AddrDelta) {
if (DWARF2_LINE_MIN_INSN_LENGTH == 1)
return AddrDelta;
if (AddrDelta % DWARF2_LINE_MIN_INSN_LENGTH != 0) {
const std::vector<const MCSection *> &MCLineSectionOrder =
MCOS->getContext().getMCLineSectionOrder();
for (std::vector<const MCSection*>::const_iterator it =
- MCLineSectionOrder.begin(), ie = MCLineSectionOrder.end(); it != ie;
+ MCLineSectionOrder.begin(), ie = MCLineSectionOrder.end(); it != ie;
++it) {
const MCSection *Sec = *it;
const MCLineSection *Line = MCLineSections.lookup(Sec);
OS << char(dwarf::DW_LNS_const_add_pc);
else {
OS << char(dwarf::DW_LNS_advance_pc);
- SmallString<32> Tmp;
- raw_svector_ostream OSE(Tmp);
- MCObjectWriter::EncodeULEB128(AddrDelta, OSE);
- OS << OSE.str();
+ MCObjectWriter::EncodeULEB128(AddrDelta, OS);
}
OS << char(dwarf::DW_LNS_extended_op);
OS << char(1);
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, const char *comment = 0) {
+ MCContext &context = streamer.getContext();
+ const MCAsmInfo &asmInfo = context.getAsmInfo();
+ const MCExpr *v = asmInfo.getExprForFDESymbol(&symbol,
+ symbolEncoding,
+ streamer);
+ unsigned size = getSizeForEncoding(streamer, symbolEncoding);
+ if (streamer.isVerboseAsm() && comment) streamer.AddComment(comment);
+ 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.EmitDwarfAdvanceFrameAddr(BaseLabel, ThisSym);
- 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;
+ bool UsingCFI;
+ bool IsEH;
+ const MCSymbol *SectionStart;
+
+ public:
+ FrameEmitterImpl(bool usingCFI, bool isEH, const MCSymbol *sectionStart) :
+ CFAOffset(0), CIENum(0), UsingCFI(usingCFI), IsEH(isEH),
+ SectionStart(sectionStart) {
}
+ /// EmitCompactUnwind - Emit the unwind information in a compact way. If
+ /// we're successful, return 'true'. Otherwise, return 'false' and it will
+ /// emit the normal CIE and FDE.
+ bool EmitCompactUnwind(MCStreamer &streamer,
+ const MCDwarfFrameInfo &frame);
+
+ 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);
+ void EmitCFIInstructions(MCStreamer &streamer,
+ const std::vector<MCCFIInstruction> &Instrs,
+ MCSymbol *BaseLabel);
+ void EmitCFIInstruction(MCStreamer &Streamer,
+ const MCCFIInstruction &Instr);
+ };
+
+} // end anonymous namespace
+
+static void EmitEncodingByte(MCStreamer &Streamer, unsigned Encoding,
+ StringRef Prefix) {
+ if (Streamer.isVerboseAsm()) {
+ const char *EncStr = 0;
+ switch (Encoding) {
+ default: EncStr = "<unknown encoding>";
+ case dwarf::DW_EH_PE_absptr: EncStr = "absptr";
+ case dwarf::DW_EH_PE_omit: EncStr = "omit";
+ case dwarf::DW_EH_PE_pcrel: EncStr = "pcrel";
+ case dwarf::DW_EH_PE_udata4: EncStr = "udata4";
+ case dwarf::DW_EH_PE_udata8: EncStr = "udata8";
+ case dwarf::DW_EH_PE_sdata4: EncStr = "sdata4";
+ case dwarf::DW_EH_PE_sdata8: EncStr = "sdata8";
+ case dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata4: EncStr = "pcrel udata4";
+ case dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata4: EncStr = "pcrel sdata4";
+ case dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata8: EncStr = "pcrel udata8";
+ case dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata8: EncStr = "pcrel sdata8";
+ case dwarf::DW_EH_PE_indirect |dwarf::DW_EH_PE_pcrel|dwarf::DW_EH_PE_udata4:
+ EncStr = "indirect pcrel udata4";
+ case dwarf::DW_EH_PE_indirect |dwarf::DW_EH_PE_pcrel|dwarf::DW_EH_PE_sdata4:
+ EncStr = "indirect pcrel sdata4";
+ case dwarf::DW_EH_PE_indirect |dwarf::DW_EH_PE_pcrel|dwarf::DW_EH_PE_udata8:
+ EncStr = "indirect pcrel udata8";
+ case dwarf::DW_EH_PE_indirect |dwarf::DW_EH_PE_pcrel|dwarf::DW_EH_PE_sdata8:
+ EncStr = "indirect pcrel sdata8";
+ }
+
+ Streamer.AddComment(Twine(Prefix) + " = " + EncStr);
+ }
+
+ Streamer.EmitIntValue(Encoding, 1);
+}
+
+void FrameEmitterImpl::EmitCFIInstruction(MCStreamer &Streamer,
+ const MCCFIInstruction &Instr) {
+ int dataAlignmentFactor = getDataAlignmentFactor(Streamer);
+ bool VerboseAsm = Streamer.isVerboseAsm();
+
+ 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);
+ if (VerboseAsm) Streamer.AddComment("DW_CFA_def_cfa_offset");
+ 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));
+ if (VerboseAsm) Streamer.AddComment("DW_CFA_def_cfa");
+ Streamer.EmitIntValue(dwarf::DW_CFA_def_cfa, 1);
+ if (VerboseAsm) Streamer.AddComment(Twine("Reg ") +
+ Twine(Src.getReg()));
+ Streamer.EmitULEB128IntValue(Src.getReg());
}
- streamer.EmitULEB128IntValue(-Src.getOffset(), 1);
- continue;
+ if (IsRelative)
+ CFAOffset += Src.getOffset();
+ else
+ CFAOffset = -Src.getOffset();
+
+ if (VerboseAsm) Streamer.AddComment(Twine("Offset " + Twine(CFAOffset)));
+ 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;
+ if (VerboseAsm) Streamer.AddComment("DW_CFA_def_cfa_register");
+ Streamer.EmitIntValue(dwarf::DW_CFA_def_cfa_register, 1);
+ if (VerboseAsm) Streamer.AddComment(Twine("Reg ") + Twine(Dst.getReg()));
+ 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);
+ if (VerboseAsm) Streamer.AddComment("DW_CFA_offset_extended_sf");
+ Streamer.EmitIntValue(dwarf::DW_CFA_offset_extended_sf, 1);
+ if (VerboseAsm) Streamer.AddComment(Twine("Reg ") + Twine(Reg));
+ Streamer.EmitULEB128IntValue(Reg);
+ if (VerboseAsm) Streamer.AddComment(Twine("Offset ") + Twine(Offset));
+ Streamer.EmitSLEB128IntValue(Offset);
} else if (Reg < 64) {
- streamer.EmitIntValue(dwarf::DW_CFA_offset + Reg, 1);
- streamer.EmitULEB128IntValue(Offset, 1);
+ if (VerboseAsm) Streamer.AddComment(Twine("DW_CFA_offset + Reg(") +
+ Twine(Reg) + ")");
+ Streamer.EmitIntValue(dwarf::DW_CFA_offset + Reg, 1);
+ if (VerboseAsm) Streamer.AddComment(Twine("Offset ") + Twine(Offset));
+ Streamer.EmitULEB128IntValue(Offset);
} else {
- streamer.EmitIntValue(dwarf::DW_CFA_offset_extended, 1);
- streamer.EmitULEB128IntValue(Reg, 1);
- streamer.EmitULEB128IntValue(Offset, 1);
+ if (VerboseAsm) Streamer.AddComment("DW_CFA_offset_extended");
+ Streamer.EmitIntValue(dwarf::DW_CFA_offset_extended, 1);
+ if (VerboseAsm) Streamer.AddComment(Twine("Reg ") + Twine(Reg));
+ Streamer.EmitULEB128IntValue(Reg);
+ if (VerboseAsm) Streamer.AddComment(Twine("Offset ") + Twine(Offset));
+ Streamer.EmitULEB128IntValue(Offset);
}
+ return;
+ }
+ case MCCFIInstruction::Remember:
+ if (VerboseAsm) Streamer.AddComment("DW_CFA_remember_state");
+ Streamer.EmitIntValue(dwarf::DW_CFA_remember_state, 1);
+ return;
+ case MCCFIInstruction::Restore:
+ if (VerboseAsm) Streamer.AddComment("DW_CFA_restore_state");
+ Streamer.EmitIntValue(dwarf::DW_CFA_restore_state, 1);
+ return;
+ case MCCFIInstruction::SameValue: {
+ unsigned Reg = Instr.getDestination().getReg();
+ if (VerboseAsm) Streamer.AddComment("DW_CFA_same_value");
+ Streamer.EmitIntValue(dwarf::DW_CFA_same_value, 1);
+ if (VerboseAsm) Streamer.AddComment(Twine("Reg ") + Twine(Reg));
+ Streamer.EmitULEB128IntValue(Reg);
+ return;
+ }
}
+ llvm_unreachable("Unhandled case in switch");
}
-static void EmitSymbol(MCStreamer &streamer, const MCSymbol &symbol,
- unsigned symbolEncoding) {
- MCContext &context = streamer.getContext();
- const TargetAsmInfo &asmInfo = context.getTargetAsmInfo();
- unsigned format = symbolEncoding & 0x0f;
- unsigned application = symbolEncoding & 0xf0;
- unsigned size;
- switch (format) {
- default:
- assert(0 && "Unknown Encoding");
- break;
- case dwarf::DW_EH_PE_absptr:
- case dwarf::DW_EH_PE_signed:
- size = asmInfo.getPointerSize();
- break;
- case dwarf::DW_EH_PE_udata2:
- case dwarf::DW_EH_PE_sdata2:
- size = 2;
- break;
- case dwarf::DW_EH_PE_udata4:
- case dwarf::DW_EH_PE_sdata4:
- size = 4;
- break;
- case dwarf::DW_EH_PE_udata8:
- case dwarf::DW_EH_PE_sdata8:
- size = 8;
- break;
- }
- switch (application) {
- default:
- assert(0 && "Unknown Encoding");
- break;
- case 0:
- case dwarf::DW_EH_PE_indirect:
- streamer.EmitSymbolValue(&symbol, size);
- break;
- case dwarf::DW_EH_PE_pcrel:
- streamer.EmitPCRelSymbolValue(&symbol, size);
- break;
+/// 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) {
+ if (streamer.isVerboseAsm()) streamer.AddComment("DW_CFA_advance_loc4");
+ streamer.EmitDwarfAdvanceFrameAddr(BaseLabel, ThisSym);
+ BaseLabel = ThisSym;
+ }
+ }
+
+ EmitCFIInstruction(streamer, Instr);
}
}
-static const MCSymbol &EmitCIE(MCStreamer &streamer,
- const MCSymbol *personality,
- unsigned personalityEncoding,
- const MCSymbol *lsda,
- unsigned lsdaEncoding) {
+/// EmitCompactUnwind - Emit the unwind information in a compact way. If we're
+/// successful, return 'true'. Otherwise, return 'false' and it will emit the
+/// normal CIE and FDE.
+bool FrameEmitterImpl::EmitCompactUnwind(MCStreamer &Streamer,
+ const MCDwarfFrameInfo &Frame) {
+#if 1
+ return false;
+#else
+ MCContext &Context = Streamer.getContext();
+ const TargetAsmInfo &TAI = Context.getTargetAsmInfo();
+ bool VerboseAsm = Streamer.isVerboseAsm();
+
+ // range-start range-length compact-unwind-enc personality-func lsda
+ // _foo LfooEnd-_foo 0x00000023 0 0
+ // _bar LbarEnd-_bar 0x00000025 __gxx_personality except_tab1
+ //
+ // .section __LD,__compact_unwind,regular,debug
+ //
+ // # compact unwind for _foo
+ // .quad _foo
+ // .set L1,LfooEnd-_foo
+ // .long L1
+ // .long 0x01010001
+ // .quad 0
+ // .quad 0
+ //
+ // # compact unwind for _bar
+ // .quad _bar
+ // .set L2,LbarEnd-_bar
+ // .long L2
+ // .long 0x01020011
+ // .quad __gxx_personality
+ // .quad except_tab1
+
+ Streamer.SwitchSection(TAI.getCompactUnwindSection());
+
+ // Range Start
+ unsigned FDEEncoding = TAI.getFDEEncoding(UsingCFI);
+ unsigned Size = getSizeForEncoding(Streamer, FDEEncoding);
+ if (VerboseAsm) Streamer.AddComment("Range Start");
+ Streamer.EmitSymbolValue(Frame.Function, Size);
+
+ // Range Length
+ const MCExpr *Range = MakeStartMinusEndExpr(Streamer, *Frame.Begin,
+ *Frame.End, 0);
+ if (VerboseAsm) Streamer.AddComment("Range Length");
+ Streamer.EmitAbsValue(Range, 4);
+
+ // FIXME:
+ // Compact Encoding
+ const std::vector<MachineMove> &Moves = TAI.getInitialFrameState();
+ uint32_t Encoding = 0;
+ Size = getSizeForEncoding(Streamer, dwarf::DW_EH_PE_udata4);
+ if (VerboseAsm) Streamer.AddComment("Compact Unwind Encoding");
+ Streamer.EmitIntValue(Encoding, Size);
+
+ // Personality Function
+ Size = getSizeForEncoding(Streamer, Frame.PersonalityEncoding);
+ if (VerboseAsm) Streamer.AddComment("Personality Function");
+ if (Frame.Personality)
+ Streamer.EmitSymbolValue(Frame.Personality, Size);
+ else
+ Streamer.EmitIntValue(0, Size); // No personality fn
+
+ // LSDA
+ Size = getSizeForEncoding(Streamer, Frame.LsdaEncoding);
+ if (VerboseAsm) Streamer.AddComment("LSDA");
+ if (Frame.Lsda)
+ Streamer.EmitSymbolValue(Frame.Lsda, Size);
+ else
+ Streamer.EmitIntValue(0, Size); // No LSDA
+
+ return true;
+#endif
+}
+
+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();
+ bool verboseAsm = streamer.isVerboseAsm();
+
+ MCSymbol *sectionStart;
+ if (asmInfo.isFunctionEHFrameSymbolPrivate() || !IsEH)
+ sectionStart = context.CreateTempSymbol();
+ else
+ sectionStart = context.GetOrCreateSymbol(Twine("EH_frame") + Twine(CIENum));
+
+ streamer.EmitLabel(sectionStart);
+ CIENum++;
+
MCSymbol *sectionEnd = streamer.getContext().CreateTempSymbol();
// Length
const MCExpr *Length = MakeStartMinusEndExpr(streamer, *sectionStart,
*sectionEnd, 4);
- streamer.EmitLabel(sectionStart);
- streamer.EmitValue(Length, 4);
+ if (verboseAsm) streamer.AddComment("CIE Length");
+ streamer.EmitAbsValue(Length, 4);
// CIE ID
- streamer.EmitIntValue(0, 4);
+ unsigned CIE_ID = IsEH ? 0 : -1;
+ if (verboseAsm) streamer.AddComment("CIE ID Tag");
+ streamer.EmitIntValue(CIE_ID, 4);
// Version
+ if (verboseAsm) streamer.AddComment("DW_CIE_VERSION");
streamer.EmitIntValue(dwarf::DW_CIE_VERSION, 1);
// Augmentation String
SmallString<8> Augmentation;
- Augmentation += "z";
- if (personality)
- Augmentation += "P";
- if (lsda)
- Augmentation += "L";
- Augmentation += "R";
- streamer.EmitBytes(Augmentation.str(), 0);
+ if (IsEH) {
+ if (verboseAsm) streamer.AddComment("CIE Augmentation");
+ Augmentation += "z";
+ if (personality)
+ Augmentation += "P";
+ if (lsda)
+ Augmentation += "L";
+ Augmentation += "R";
+ streamer.EmitBytes(Augmentation.str(), 0);
+ }
streamer.EmitIntValue(0, 1);
// Code Alignment Factor
+ if (verboseAsm) streamer.AddComment("CIE Code Alignment Factor");
streamer.EmitULEB128IntValue(1);
// Data Alignment Factor
+ if (verboseAsm) streamer.AddComment("CIE Data Alignment Factor");
streamer.EmitSLEB128IntValue(getDataAlignmentFactor(streamer));
// Return Address Register
+ if (verboseAsm) streamer.AddComment("CIE Return Address Column");
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);
-
- // Augmentation Data (optional)
- streamer.EmitLabel(augmentationStart);
- if (personality) {
- // Personality Encoding
- streamer.EmitIntValue(personalityEncoding, 1);
- // Personality
- EmitSymbol(streamer, *personality, personalityEncoding);
- }
- if (lsda) {
- // LSDA Encoding
- streamer.EmitIntValue(lsdaEncoding, 1);
+
+ unsigned augmentationLength = 0;
+ if (IsEH) {
+ if (personality) {
+ // Personality Encoding
+ augmentationLength += 1;
+ // Personality
+ augmentationLength += getSizeForEncoding(streamer, personalityEncoding);
+ }
+ if (lsda)
+ augmentationLength += 1;
+ // Encoding of the FDE pointers
+ augmentationLength += 1;
+
+ if (verboseAsm) streamer.AddComment("Augmentation Size");
+ streamer.EmitULEB128IntValue(augmentationLength);
+
+ // Augmentation Data (optional)
+ if (personality) {
+ // Personality Encoding
+ EmitEncodingByte(streamer, personalityEncoding,
+ "Personality Encoding");
+ // Personality
+ if (verboseAsm) streamer.AddComment("Personality");
+ EmitPersonality(streamer, *personality, personalityEncoding);
+ }
+
+ if (lsda)
+ EmitEncodingByte(streamer, lsdaEncoding, "LSDA Encoding");
+
+ // Encoding of the FDE pointers
+ EmitEncodingByte(streamer, asmInfo.getFDEEncoding(UsingCFI),
+ "FDE Encoding");
}
- // Encoding of the FDE pointers
- streamer.EmitIntValue(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4, 1);
- streamer.EmitLabel(augmentationEnd);
// Initial Instructions
- const std::vector<MachineMove> Moves = asmInfo.getInitialFrameState();
+ 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);
+ streamer.EmitValueToAlignment(IsEH ? 4 : asmInfo.getPointerSize());
streamer.EmitLabel(sectionEnd);
return *sectionStart;
}
-static MCSymbol *EmitFDE(MCStreamer &streamer,
- const MCSymbol &cieStart,
- const MCDwarfFrameInfo &frame) {
+MCSymbol *FrameEmitterImpl::EmitFDE(MCStreamer &streamer,
+ const MCSymbol &cieStart,
+ const MCDwarfFrameInfo &frame) {
MCContext &context = streamer.getContext();
MCSymbol *fdeStart = context.CreateTempSymbol();
MCSymbol *fdeEnd = context.CreateTempSymbol();
+ const TargetAsmInfo &TAsmInfo = context.getTargetAsmInfo();
+ bool verboseAsm = streamer.isVerboseAsm();
+
+ if (!TAsmInfo.isFunctionEHFrameSymbolPrivate() && IsEH) {
+ MCSymbol *EHSym =
+ context.GetOrCreateSymbol(frame.Function->getName() + Twine(".eh"));
+ streamer.EmitEHSymAttributes(frame.Function, EHSym);
+ streamer.EmitLabel(EHSym);
+ }
// Length
const MCExpr *Length = MakeStartMinusEndExpr(streamer, *fdeStart, *fdeEnd, 0);
- streamer.EmitValue(Length, 4);
+ if (verboseAsm) streamer.AddComment("FDE Length");
+ streamer.EmitAbsValue(Length, 4);
streamer.EmitLabel(fdeStart);
+
// CIE Pointer
- const MCExpr *offset = MakeStartMinusEndExpr(streamer, cieStart, *fdeStart,
- 0);
- streamer.EmitValue(offset, 4);
+ const MCAsmInfo &asmInfo = context.getAsmInfo();
+ if (IsEH) {
+ const MCExpr *offset = MakeStartMinusEndExpr(streamer, cieStart, *fdeStart,
+ 0);
+ if (verboseAsm) streamer.AddComment("FDE CIE Offset");
+ streamer.EmitAbsValue(offset, 4);
+ } else if (!asmInfo.doesDwarfRequireRelocationForSectionOffset()) {
+ const MCExpr *offset = MakeStartMinusEndExpr(streamer, *SectionStart,
+ cieStart, 0);
+ streamer.EmitAbsValue(offset, 4);
+ } else {
+ streamer.EmitSymbolValue(&cieStart, 4);
+ }
+
+ unsigned fdeEncoding = TAsmInfo.getFDEEncoding(UsingCFI);
+ unsigned size = getSizeForEncoding(streamer, fdeEncoding);
// PC Begin
- streamer.EmitPCRelSymbolValue(frame.Begin, 4);
+ unsigned PCBeginEncoding = IsEH ? fdeEncoding :
+ (unsigned)dwarf::DW_EH_PE_absptr;
+ unsigned PCBeginSize = getSizeForEncoding(streamer, PCBeginEncoding);
+ EmitSymbol(streamer, *frame.Begin, PCBeginEncoding, "FDE initial location");
// PC Range
const MCExpr *Range = MakeStartMinusEndExpr(streamer, *frame.Begin,
*frame.End, 0);
- streamer.EmitValue(Range, 4);
-
- // Augmentation Data Length
- MCSymbol *augmentationStart = streamer.getContext().CreateTempSymbol();
- MCSymbol *augmentationEnd = streamer.getContext().CreateTempSymbol();
- const MCExpr *augmentationLength = MakeStartMinusEndExpr(streamer,
- *augmentationStart,
- *augmentationEnd, 0);
- streamer.EmitULEB128Value(augmentationLength);
-
- // Augmentation Data
- streamer.EmitLabel(augmentationStart);
- if (frame.Lsda)
- EmitSymbol(streamer, *frame.Lsda, frame.LsdaEncoding);
- streamer.EmitLabel(augmentationEnd);
+ if (verboseAsm) streamer.AddComment("FDE address range");
+ streamer.EmitAbsValue(Range, size);
+
+ if (IsEH) {
+ // Augmentation Data Length
+ unsigned augmentationLength = 0;
+
+ if (frame.Lsda)
+ augmentationLength += getSizeForEncoding(streamer, frame.LsdaEncoding);
+
+ if (verboseAsm) streamer.AddComment("Augmentation size");
+ streamer.EmitULEB128IntValue(augmentationLength);
+
+ // Augmentation Data
+ if (frame.Lsda)
+ EmitSymbol(streamer, *frame.Lsda, frame.LsdaEncoding,
+ "Language Specific Data Area");
+ }
+
// Call Frame Instructions
- EmitFrameMoves(streamer, frame.Moves, frame.Begin, true);
+ EmitCFIInstructions(streamer, frame.Instructions, frame.Begin);
// Padding
- streamer.EmitValueToAlignment(4);
+ streamer.EmitValueToAlignment(PCBeginSize);
return fdeEnd;
}
-struct CIEKey {
- static const CIEKey EmptyKey;
- static const CIEKey TombstoneKey;
-
- CIEKey(const MCSymbol* Personality_, unsigned PersonalityEncoding_,
- unsigned LsdaEncoding_) : Personality(Personality_),
- PersonalityEncoding(PersonalityEncoding_),
- LsdaEncoding(LsdaEncoding_) {
- }
- const MCSymbol* Personality;
- unsigned PersonalityEncoding;
- unsigned LsdaEncoding;
-};
+namespace {
+ struct CIEKey {
+ static const CIEKey getEmptyKey() { return CIEKey(0, 0, -1); }
+ static const CIEKey getTombstoneKey() { return CIEKey(0, -1, 0); }
-const CIEKey CIEKey::EmptyKey(0, 0, -1);
-const CIEKey CIEKey::TombstoneKey(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::EmptyKey;
+ return CIEKey::getEmptyKey();
}
static CIEKey getTombstoneKey() {
- return CIEKey::TombstoneKey;
+ return CIEKey::getTombstoneKey();
}
static unsigned getHashValue(const CIEKey &Key) {
FoldingSetNodeID ID;
};
}
-void MCDwarfFrameEmitter::Emit(MCStreamer &streamer) {
- const MCContext &context = streamer.getContext();
- const TargetAsmInfo &asmInfo = context.getTargetAsmInfo();
- MCSymbol *fdeEnd = NULL;
+void MCDwarfFrameEmitter::Emit(MCStreamer &Streamer,
+ bool UsingCFI,
+ bool IsEH) {
+ MCContext &Context = Streamer.getContext();
+ const TargetAsmInfo &AsmInfo = Context.getTargetAsmInfo();
+ const MCSection &Section = IsEH ? *AsmInfo.getEHFrameSection() :
+ *AsmInfo.getDwarfFrameSection();
+ Streamer.SwitchSection(&Section);
+ MCSymbol *SectionStart = Context.CreateTempSymbol();
+ Streamer.EmitLabel(SectionStart);
+
+ MCSymbol *FDEEnd = NULL;
DenseMap<CIEKey, const MCSymbol*> CIEStarts;
+ FrameEmitterImpl Emitter(UsingCFI, IsEH, SectionStart);
+
+ const MCSymbol *DummyDebugKey = NULL;
+ for (unsigned i = 0, n = Streamer.getNumFrameInfos(); i < n; ++i) {
+ const MCDwarfFrameInfo &Frame = Streamer.getFrameInfo(i);
+ if (IsEH && AsmInfo.getCompactUnwindSection() &&
+ Emitter.EmitCompactUnwind(Streamer, Frame))
+ continue;
+
+ CIEKey Key(Frame.Personality, Frame.PersonalityEncoding,
+ Frame.LsdaEncoding);
+ const MCSymbol *&CIEStart = IsEH ? CIEStarts[Key] : DummyDebugKey;
+ if (!CIEStart)
+ CIEStart = &Emitter.EmitCIE(Streamer, Frame.Personality,
+ Frame.PersonalityEncoding, Frame.Lsda,
+ Frame.LsdaEncoding);
+
+ FDEEnd = Emitter.EmitFDE(Streamer, *CIEStart, Frame);
- for (unsigned i = 0, n = streamer.getNumFrameInfos(); i < n; ++i) {
- const MCDwarfFrameInfo &frame = streamer.getFrameInfo(i);
- CIEKey key(frame.Personality, frame.PersonalityEncoding,
- frame.LsdaEncoding);
- const MCSymbol *&cieStart = CIEStarts[key];
- if (!cieStart)
- cieStart = &EmitCIE(streamer, frame.Personality,
- frame.PersonalityEncoding, frame.Lsda,
- frame.LsdaEncoding);
- fdeEnd = EmitFDE(streamer, *cieStart, frame);
if (i != n - 1)
- streamer.EmitLabel(fdeEnd);
+ Streamer.EmitLabel(FDEEnd);
}
- streamer.EmitValueToAlignment(asmInfo.getPointerSize());
- if (fdeEnd)
- streamer.EmitLabel(fdeEnd);
+ Streamer.EmitValueToAlignment(AsmInfo.getPointerSize());
+ if (FDEEnd)
+ Streamer.EmitLabel(FDEEnd);
}
void MCDwarfFrameEmitter::EmitAdvanceLoc(MCStreamer &Streamer,
void MCDwarfFrameEmitter::EncodeAdvanceLoc(uint64_t AddrDelta,
raw_ostream &OS) {
// FIXME: Assumes the code alignment factor is 1.
- if (isUIntN(6, AddrDelta)) {
+ if (AddrDelta == 0) {
+ } else if (isUIntN(6, AddrDelta)) {
uint8_t Opcode = dwarf::DW_CFA_advance_loc | AddrDelta;
OS << Opcode;
} else if (isUInt<8>(AddrDelta)) {
OS << uint8_t(dwarf::DW_CFA_advance_loc1);
OS << uint8_t(AddrDelta);
} else if (isUInt<16>(AddrDelta)) {
+ // FIXME: check what is the correct behavior on a big endian machine.
OS << uint8_t(dwarf::DW_CFA_advance_loc2);
- OS << uint16_t(AddrDelta);
+ 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 << uint32_t(AddrDelta);
+ 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