| //===----- JITDwarfEmitter.cpp - Write dwarf tables into memory -----------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file defines a JITDwarfEmitter object that is used by the JIT to |
| // write dwarf tables to memory. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "JIT.h" |
| #include "JITDwarfEmitter.h" |
| #include "llvm/Function.h" |
| #include "llvm/ADT/DenseMap.h" |
| #include "llvm/CodeGen/JITCodeEmitter.h" |
| #include "llvm/CodeGen/MachineFunction.h" |
| #include "llvm/CodeGen/MachineModuleInfo.h" |
| #include "llvm/ExecutionEngine/JITMemoryManager.h" |
| #include "llvm/MC/MachineLocation.h" |
| #include "llvm/MC/MCAsmInfo.h" |
| #include "llvm/MC/MCSymbol.h" |
| #include "llvm/Support/ErrorHandling.h" |
| #include "llvm/Target/TargetData.h" |
| #include "llvm/Target/TargetInstrInfo.h" |
| #include "llvm/Target/TargetFrameLowering.h" |
| #include "llvm/Target/TargetMachine.h" |
| #include "llvm/Target/TargetRegisterInfo.h" |
| using namespace llvm; |
| |
| JITDwarfEmitter::JITDwarfEmitter(JIT& theJit) : MMI(0), Jit(theJit) {} |
| |
| |
| unsigned char* JITDwarfEmitter::EmitDwarfTable(MachineFunction& F, |
| JITCodeEmitter& jce, |
| unsigned char* StartFunction, |
| unsigned char* EndFunction, |
| unsigned char* &EHFramePtr) { |
| assert(MMI && "MachineModuleInfo not registered!"); |
| |
| const TargetMachine& TM = F.getTarget(); |
| TD = TM.getTargetData(); |
| stackGrowthDirection = TM.getFrameLowering()->getStackGrowthDirection(); |
| RI = TM.getRegisterInfo(); |
| MAI = TM.getMCAsmInfo(); |
| JCE = &jce; |
| |
| unsigned char* ExceptionTable = EmitExceptionTable(&F, StartFunction, |
| EndFunction); |
| |
| unsigned char* Result = 0; |
| |
| const std::vector<const Function *> Personalities = MMI->getPersonalities(); |
| EHFramePtr = EmitCommonEHFrame(Personalities[MMI->getPersonalityIndex()]); |
| |
| Result = EmitEHFrame(Personalities[MMI->getPersonalityIndex()], EHFramePtr, |
| StartFunction, EndFunction, ExceptionTable); |
| |
| return Result; |
| } |
| |
| |
| void |
| JITDwarfEmitter::EmitFrameMoves(intptr_t BaseLabelPtr, |
| const std::vector<MachineMove> &Moves) const { |
| unsigned PointerSize = TD->getPointerSize(); |
| int stackGrowth = stackGrowthDirection == TargetFrameLowering::StackGrowsUp ? |
| PointerSize : -PointerSize; |
| MCSymbol *BaseLabel = 0; |
| |
| 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 && (*JCE->getLabelLocations())[Label] == 0) |
| continue; |
| |
| intptr_t LabelPtr = 0; |
| if (Label) LabelPtr = JCE->getLabelAddress(Label); |
| |
| const MachineLocation &Dst = Move.getDestination(); |
| const MachineLocation &Src = Move.getSource(); |
| |
| // Advance row if new location. |
| if (BaseLabelPtr && Label && BaseLabel != Label) { |
| JCE->emitByte(dwarf::DW_CFA_advance_loc4); |
| JCE->emitInt32(LabelPtr - BaseLabelPtr); |
| |
| BaseLabel = Label; |
| BaseLabelPtr = LabelPtr; |
| } |
| |
| // If advancing cfa. |
| if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) { |
| if (!Src.isReg()) { |
| if (Src.getReg() == MachineLocation::VirtualFP) { |
| JCE->emitByte(dwarf::DW_CFA_def_cfa_offset); |
| } else { |
| JCE->emitByte(dwarf::DW_CFA_def_cfa); |
| JCE->emitULEB128Bytes(RI->getDwarfRegNum(Src.getReg(), true)); |
| } |
| |
| JCE->emitULEB128Bytes(-Src.getOffset()); |
| } else { |
| llvm_unreachable("Machine move not supported yet."); |
| } |
| } else if (Src.isReg() && |
| Src.getReg() == MachineLocation::VirtualFP) { |
| if (Dst.isReg()) { |
| JCE->emitByte(dwarf::DW_CFA_def_cfa_register); |
| JCE->emitULEB128Bytes(RI->getDwarfRegNum(Dst.getReg(), true)); |
| } else { |
| llvm_unreachable("Machine move not supported yet."); |
| } |
| } else { |
| unsigned Reg = RI->getDwarfRegNum(Src.getReg(), true); |
| int Offset = Dst.getOffset() / stackGrowth; |
| |
| if (Offset < 0) { |
| JCE->emitByte(dwarf::DW_CFA_offset_extended_sf); |
| JCE->emitULEB128Bytes(Reg); |
| JCE->emitSLEB128Bytes(Offset); |
| } else if (Reg < 64) { |
| JCE->emitByte(dwarf::DW_CFA_offset + Reg); |
| JCE->emitULEB128Bytes(Offset); |
| } else { |
| JCE->emitByte(dwarf::DW_CFA_offset_extended); |
| JCE->emitULEB128Bytes(Reg); |
| JCE->emitULEB128Bytes(Offset); |
| } |
| } |
| } |
| } |
| |
| /// SharedTypeIds - How many leading type ids two landing pads have in common. |
| static unsigned SharedTypeIds(const LandingPadInfo *L, |
| const LandingPadInfo *R) { |
| const std::vector<int> &LIds = L->TypeIds, &RIds = R->TypeIds; |
| unsigned LSize = LIds.size(), RSize = RIds.size(); |
| unsigned MinSize = LSize < RSize ? LSize : RSize; |
| unsigned Count = 0; |
| |
| for (; Count != MinSize; ++Count) |
| if (LIds[Count] != RIds[Count]) |
| return Count; |
| |
| return Count; |
| } |
| |
| |
| /// PadLT - Order landing pads lexicographically by type id. |
| static bool PadLT(const LandingPadInfo *L, const LandingPadInfo *R) { |
| const std::vector<int> &LIds = L->TypeIds, &RIds = R->TypeIds; |
| unsigned LSize = LIds.size(), RSize = RIds.size(); |
| unsigned MinSize = LSize < RSize ? LSize : RSize; |
| |
| for (unsigned i = 0; i != MinSize; ++i) |
| if (LIds[i] != RIds[i]) |
| return LIds[i] < RIds[i]; |
| |
| return LSize < RSize; |
| } |
| |
| namespace { |
| |
| /// ActionEntry - Structure describing an entry in the actions table. |
| struct ActionEntry { |
| int ValueForTypeID; // The value to write - may not be equal to the type id. |
| int NextAction; |
| struct ActionEntry *Previous; |
| }; |
| |
| /// PadRange - Structure holding a try-range and the associated landing pad. |
| struct PadRange { |
| // The index of the landing pad. |
| unsigned PadIndex; |
| // The index of the begin and end labels in the landing pad's label lists. |
| unsigned RangeIndex; |
| }; |
| |
| typedef DenseMap<MCSymbol*, PadRange> RangeMapType; |
| |
| /// CallSiteEntry - Structure describing an entry in the call-site table. |
| struct CallSiteEntry { |
| MCSymbol *BeginLabel; // zero indicates the start of the function. |
| MCSymbol *EndLabel; // zero indicates the end of the function. |
| MCSymbol *PadLabel; // zero indicates that there is no landing pad. |
| unsigned Action; |
| }; |
| |
| } |
| |
| unsigned char* JITDwarfEmitter::EmitExceptionTable(MachineFunction* MF, |
| unsigned char* StartFunction, |
| unsigned char* EndFunction) const { |
| assert(MMI && "MachineModuleInfo not registered!"); |
| |
| // Map all labels and get rid of any dead landing pads. |
| MMI->TidyLandingPads(JCE->getLabelLocations()); |
| |
| const std::vector<const GlobalVariable *> &TypeInfos = MMI->getTypeInfos(); |
| const std::vector<unsigned> &FilterIds = MMI->getFilterIds(); |
| const std::vector<LandingPadInfo> &PadInfos = MMI->getLandingPads(); |
| if (PadInfos.empty()) return 0; |
| |
| // Sort the landing pads in order of their type ids. This is used to fold |
| // duplicate actions. |
| SmallVector<const LandingPadInfo *, 64> LandingPads; |
| LandingPads.reserve(PadInfos.size()); |
| for (unsigned i = 0, N = PadInfos.size(); i != N; ++i) |
| LandingPads.push_back(&PadInfos[i]); |
| std::sort(LandingPads.begin(), LandingPads.end(), PadLT); |
| |
| // Negative type ids index into FilterIds, positive type ids index into |
| // TypeInfos. The value written for a positive type id is just the type |
| // id itself. For a negative type id, however, the value written is the |
| // (negative) byte offset of the corresponding FilterIds entry. The byte |
| // offset is usually equal to the type id, because the FilterIds entries |
| // are written using a variable width encoding which outputs one byte per |
| // entry as long as the value written is not too large, but can differ. |
| // This kind of complication does not occur for positive type ids because |
| // type infos are output using a fixed width encoding. |
| // FilterOffsets[i] holds the byte offset corresponding to FilterIds[i]. |
| SmallVector<int, 16> FilterOffsets; |
| FilterOffsets.reserve(FilterIds.size()); |
| int Offset = -1; |
| for(std::vector<unsigned>::const_iterator I = FilterIds.begin(), |
| E = FilterIds.end(); I != E; ++I) { |
| FilterOffsets.push_back(Offset); |
| Offset -= MCAsmInfo::getULEB128Size(*I); |
| } |
| |
| // Compute the actions table and gather the first action index for each |
| // landing pad site. |
| SmallVector<ActionEntry, 32> Actions; |
| SmallVector<unsigned, 64> FirstActions; |
| FirstActions.reserve(LandingPads.size()); |
| |
| int FirstAction = 0; |
| unsigned SizeActions = 0; |
| for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) { |
| const LandingPadInfo *LP = LandingPads[i]; |
| const std::vector<int> &TypeIds = LP->TypeIds; |
| const unsigned NumShared = i ? SharedTypeIds(LP, LandingPads[i-1]) : 0; |
| unsigned SizeSiteActions = 0; |
| |
| if (NumShared < TypeIds.size()) { |
| unsigned SizeAction = 0; |
| ActionEntry *PrevAction = 0; |
| |
| if (NumShared) { |
| const unsigned SizePrevIds = LandingPads[i-1]->TypeIds.size(); |
| assert(Actions.size()); |
| PrevAction = &Actions.back(); |
| SizeAction = MCAsmInfo::getSLEB128Size(PrevAction->NextAction) + |
| MCAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID); |
| for (unsigned j = NumShared; j != SizePrevIds; ++j) { |
| SizeAction -= MCAsmInfo::getSLEB128Size(PrevAction->ValueForTypeID); |
| SizeAction += -PrevAction->NextAction; |
| PrevAction = PrevAction->Previous; |
| } |
| } |
| |
| // Compute the actions. |
| for (unsigned I = NumShared, M = TypeIds.size(); I != M; ++I) { |
| int TypeID = TypeIds[I]; |
| assert(-1-TypeID < (int)FilterOffsets.size() && "Unknown filter id!"); |
| int ValueForTypeID = TypeID < 0 ? FilterOffsets[-1 - TypeID] : TypeID; |
| unsigned SizeTypeID = MCAsmInfo::getSLEB128Size(ValueForTypeID); |
| |
| int NextAction = SizeAction ? -(SizeAction + SizeTypeID) : 0; |
| SizeAction = SizeTypeID + MCAsmInfo::getSLEB128Size(NextAction); |
| SizeSiteActions += SizeAction; |
| |
| ActionEntry Action = {ValueForTypeID, NextAction, PrevAction}; |
| Actions.push_back(Action); |
| |
| PrevAction = &Actions.back(); |
| } |
| |
| // Record the first action of the landing pad site. |
| FirstAction = SizeActions + SizeSiteActions - SizeAction + 1; |
| } // else identical - re-use previous FirstAction |
| |
| FirstActions.push_back(FirstAction); |
| |
| // Compute this sites contribution to size. |
| SizeActions += SizeSiteActions; |
| } |
| |
| // Compute the call-site table. Entries must be ordered by address. |
| SmallVector<CallSiteEntry, 64> CallSites; |
| |
| RangeMapType PadMap; |
| for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) { |
| const LandingPadInfo *LandingPad = LandingPads[i]; |
| for (unsigned j=0, E = LandingPad->BeginLabels.size(); j != E; ++j) { |
| MCSymbol *BeginLabel = LandingPad->BeginLabels[j]; |
| assert(!PadMap.count(BeginLabel) && "Duplicate landing pad labels!"); |
| PadRange P = { i, j }; |
| PadMap[BeginLabel] = P; |
| } |
| } |
| |
| bool MayThrow = false; |
| MCSymbol *LastLabel = 0; |
| for (MachineFunction::const_iterator I = MF->begin(), E = MF->end(); |
| I != E; ++I) { |
| for (MachineBasicBlock::const_iterator MI = I->begin(), E = I->end(); |
| MI != E; ++MI) { |
| if (!MI->isLabel()) { |
| MayThrow |= MI->isCall(); |
| continue; |
| } |
| |
| MCSymbol *BeginLabel = MI->getOperand(0).getMCSymbol(); |
| assert(BeginLabel && "Invalid label!"); |
| |
| if (BeginLabel == LastLabel) |
| MayThrow = false; |
| |
| RangeMapType::iterator L = PadMap.find(BeginLabel); |
| |
| if (L == PadMap.end()) |
| continue; |
| |
| PadRange P = L->second; |
| const LandingPadInfo *LandingPad = LandingPads[P.PadIndex]; |
| |
| assert(BeginLabel == LandingPad->BeginLabels[P.RangeIndex] && |
| "Inconsistent landing pad map!"); |
| |
| // If some instruction between the previous try-range and this one may |
| // throw, create a call-site entry with no landing pad for the region |
| // between the try-ranges. |
| if (MayThrow) { |
| CallSiteEntry Site = {LastLabel, BeginLabel, 0, 0}; |
| CallSites.push_back(Site); |
| } |
| |
| LastLabel = LandingPad->EndLabels[P.RangeIndex]; |
| CallSiteEntry Site = {BeginLabel, LastLabel, |
| LandingPad->LandingPadLabel, FirstActions[P.PadIndex]}; |
| |
| assert(Site.BeginLabel && Site.EndLabel && Site.PadLabel && |
| "Invalid landing pad!"); |
| |
| // Try to merge with the previous call-site. |
| if (CallSites.size()) { |
| CallSiteEntry &Prev = CallSites.back(); |
| if (Site.PadLabel == Prev.PadLabel && Site.Action == Prev.Action) { |
| // Extend the range of the previous entry. |
| Prev.EndLabel = Site.EndLabel; |
| continue; |
| } |
| } |
| |
| // Otherwise, create a new call-site. |
| CallSites.push_back(Site); |
| } |
| } |
| // If some instruction between the previous try-range and the end of the |
| // function may throw, create a call-site entry with no landing pad for the |
| // region following the try-range. |
| if (MayThrow) { |
| CallSiteEntry Site = {LastLabel, 0, 0, 0}; |
| CallSites.push_back(Site); |
| } |
| |
| // Final tallies. |
| unsigned SizeSites = CallSites.size() * (sizeof(int32_t) + // Site start. |
| sizeof(int32_t) + // Site length. |
| sizeof(int32_t)); // Landing pad. |
| for (unsigned i = 0, e = CallSites.size(); i < e; ++i) |
| SizeSites += MCAsmInfo::getULEB128Size(CallSites[i].Action); |
| |
| unsigned SizeTypes = TypeInfos.size() * TD->getPointerSize(); |
| |
| unsigned TypeOffset = sizeof(int8_t) + // Call site format |
| // Call-site table length |
| MCAsmInfo::getULEB128Size(SizeSites) + |
| SizeSites + SizeActions + SizeTypes; |
| |
| // Begin the exception table. |
| JCE->emitAlignmentWithFill(4, 0); |
| // Asm->EOL("Padding"); |
| |
| unsigned char* DwarfExceptionTable = (unsigned char*)JCE->getCurrentPCValue(); |
| |
| // Emit the header. |
| JCE->emitByte(dwarf::DW_EH_PE_omit); |
| // Asm->EOL("LPStart format (DW_EH_PE_omit)"); |
| JCE->emitByte(dwarf::DW_EH_PE_absptr); |
| // Asm->EOL("TType format (DW_EH_PE_absptr)"); |
| JCE->emitULEB128Bytes(TypeOffset); |
| // Asm->EOL("TType base offset"); |
| JCE->emitByte(dwarf::DW_EH_PE_udata4); |
| // Asm->EOL("Call site format (DW_EH_PE_udata4)"); |
| JCE->emitULEB128Bytes(SizeSites); |
| // Asm->EOL("Call-site table length"); |
| |
| // Emit the landing pad site information. |
| for (unsigned i = 0; i < CallSites.size(); ++i) { |
| CallSiteEntry &S = CallSites[i]; |
| intptr_t BeginLabelPtr = 0; |
| intptr_t EndLabelPtr = 0; |
| |
| if (!S.BeginLabel) { |
| BeginLabelPtr = (intptr_t)StartFunction; |
| JCE->emitInt32(0); |
| } else { |
| BeginLabelPtr = JCE->getLabelAddress(S.BeginLabel); |
| JCE->emitInt32(BeginLabelPtr - (intptr_t)StartFunction); |
| } |
| |
| // Asm->EOL("Region start"); |
| |
| if (!S.EndLabel) |
| EndLabelPtr = (intptr_t)EndFunction; |
| else |
| EndLabelPtr = JCE->getLabelAddress(S.EndLabel); |
| |
| JCE->emitInt32(EndLabelPtr - BeginLabelPtr); |
| //Asm->EOL("Region length"); |
| |
| if (!S.PadLabel) { |
| JCE->emitInt32(0); |
| } else { |
| unsigned PadLabelPtr = JCE->getLabelAddress(S.PadLabel); |
| JCE->emitInt32(PadLabelPtr - (intptr_t)StartFunction); |
| } |
| // Asm->EOL("Landing pad"); |
| |
| JCE->emitULEB128Bytes(S.Action); |
| // Asm->EOL("Action"); |
| } |
| |
| // Emit the actions. |
| for (unsigned I = 0, N = Actions.size(); I != N; ++I) { |
| ActionEntry &Action = Actions[I]; |
| |
| JCE->emitSLEB128Bytes(Action.ValueForTypeID); |
| //Asm->EOL("TypeInfo index"); |
| JCE->emitSLEB128Bytes(Action.NextAction); |
| //Asm->EOL("Next action"); |
| } |
| |
| // Emit the type ids. |
| for (unsigned M = TypeInfos.size(); M; --M) { |
| const GlobalVariable *GV = TypeInfos[M - 1]; |
| |
| if (GV) { |
| if (TD->getPointerSize() == sizeof(int32_t)) |
| JCE->emitInt32((intptr_t)Jit.getOrEmitGlobalVariable(GV)); |
| else |
| JCE->emitInt64((intptr_t)Jit.getOrEmitGlobalVariable(GV)); |
| } else { |
| if (TD->getPointerSize() == sizeof(int32_t)) |
| JCE->emitInt32(0); |
| else |
| JCE->emitInt64(0); |
| } |
| // Asm->EOL("TypeInfo"); |
| } |
| |
| // Emit the filter typeids. |
| for (unsigned j = 0, M = FilterIds.size(); j < M; ++j) { |
| unsigned TypeID = FilterIds[j]; |
| JCE->emitULEB128Bytes(TypeID); |
| //Asm->EOL("Filter TypeInfo index"); |
| } |
| |
| JCE->emitAlignmentWithFill(4, 0); |
| |
| return DwarfExceptionTable; |
| } |
| |
| unsigned char* |
| JITDwarfEmitter::EmitCommonEHFrame(const Function* Personality) const { |
| unsigned PointerSize = TD->getPointerSize(); |
| int stackGrowth = stackGrowthDirection == TargetFrameLowering::StackGrowsUp ? |
| PointerSize : -PointerSize; |
| |
| unsigned char* StartCommonPtr = (unsigned char*)JCE->getCurrentPCValue(); |
| // EH Common Frame header |
| JCE->allocateSpace(4, 0); |
| unsigned char* FrameCommonBeginPtr = (unsigned char*)JCE->getCurrentPCValue(); |
| JCE->emitInt32((int)0); |
| JCE->emitByte(dwarf::DW_CIE_VERSION); |
| JCE->emitString(Personality ? "zPLR" : "zR"); |
| JCE->emitULEB128Bytes(1); |
| JCE->emitSLEB128Bytes(stackGrowth); |
| JCE->emitByte(RI->getDwarfRegNum(RI->getRARegister(), true)); |
| |
| if (Personality) { |
| // Augmentation Size: 3 small ULEBs of one byte each, and the personality |
| // function which size is PointerSize. |
| JCE->emitULEB128Bytes(3 + PointerSize); |
| |
| // We set the encoding of the personality as direct encoding because we use |
| // the function pointer. The encoding is not relative because the current |
| // PC value may be bigger than the personality function pointer. |
| if (PointerSize == 4) { |
| JCE->emitByte(dwarf::DW_EH_PE_sdata4); |
| JCE->emitInt32(((intptr_t)Jit.getPointerToGlobal(Personality))); |
| } else { |
| JCE->emitByte(dwarf::DW_EH_PE_sdata8); |
| JCE->emitInt64(((intptr_t)Jit.getPointerToGlobal(Personality))); |
| } |
| |
| // LSDA encoding: This must match the encoding used in EmitEHFrame () |
| if (PointerSize == 4) |
| JCE->emitULEB128Bytes(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4); |
| else |
| JCE->emitULEB128Bytes(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8); |
| JCE->emitULEB128Bytes(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4); |
| } else { |
| JCE->emitULEB128Bytes(1); |
| JCE->emitULEB128Bytes(dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4); |
| } |
| |
| EmitFrameMoves(0, MAI->getInitialFrameState()); |
| |
| JCE->emitAlignmentWithFill(PointerSize, dwarf::DW_CFA_nop); |
| |
| JCE->emitInt32At((uintptr_t*)StartCommonPtr, |
| (uintptr_t)((unsigned char*)JCE->getCurrentPCValue() - |
| FrameCommonBeginPtr)); |
| |
| return StartCommonPtr; |
| } |
| |
| |
| unsigned char* |
| JITDwarfEmitter::EmitEHFrame(const Function* Personality, |
| unsigned char* StartCommonPtr, |
| unsigned char* StartFunction, |
| unsigned char* EndFunction, |
| unsigned char* ExceptionTable) const { |
| unsigned PointerSize = TD->getPointerSize(); |
| |
| // EH frame header. |
| unsigned char* StartEHPtr = (unsigned char*)JCE->getCurrentPCValue(); |
| JCE->allocateSpace(4, 0); |
| unsigned char* FrameBeginPtr = (unsigned char*)JCE->getCurrentPCValue(); |
| // FDE CIE Offset |
| JCE->emitInt32(FrameBeginPtr - StartCommonPtr); |
| JCE->emitInt32(StartFunction - (unsigned char*)JCE->getCurrentPCValue()); |
| JCE->emitInt32(EndFunction - StartFunction); |
| |
| // If there is a personality and landing pads then point to the language |
| // specific data area in the exception table. |
| if (Personality) { |
| JCE->emitULEB128Bytes(PointerSize == 4 ? 4 : 8); |
| |
| if (PointerSize == 4) { |
| if (!MMI->getLandingPads().empty()) |
| JCE->emitInt32(ExceptionTable-(unsigned char*)JCE->getCurrentPCValue()); |
| else |
| JCE->emitInt32((int)0); |
| } else { |
| if (!MMI->getLandingPads().empty()) |
| JCE->emitInt64(ExceptionTable-(unsigned char*)JCE->getCurrentPCValue()); |
| else |
| JCE->emitInt64((int)0); |
| } |
| } else { |
| JCE->emitULEB128Bytes(0); |
| } |
| |
| // Indicate locations of function specific callee saved registers in |
| // frame. |
| EmitFrameMoves((intptr_t)StartFunction, MMI->getFrameMoves()); |
| |
| JCE->emitAlignmentWithFill(PointerSize, dwarf::DW_CFA_nop); |
| |
| // Indicate the size of the table |
| JCE->emitInt32At((uintptr_t*)StartEHPtr, |
| (uintptr_t)((unsigned char*)JCE->getCurrentPCValue() - |
| StartEHPtr)); |
| |
| // Double zeroes for the unwind runtime |
| if (PointerSize == 8) { |
| JCE->emitInt64(0); |
| JCE->emitInt64(0); |
| } else { |
| JCE->emitInt32(0); |
| JCE->emitInt32(0); |
| } |
| |
| return StartEHPtr; |
| } |
