X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FCodeGen%2FStackMaps.cpp;h=adbb38e8b55c88ee54a83a0550c0461510820d20;hb=0526d167a9f8fcd476f4382d933dda208a4eb5c8;hp=b6a900ab495f6353fd039df94d246135214db3a8;hpb=c87e4380542c0e15cdaa480716da1434284feb93;p=oota-llvm.git diff --git a/lib/CodeGen/StackMaps.cpp b/lib/CodeGen/StackMaps.cpp index b6a900ab495..adbb38e8b55 100644 --- a/lib/CodeGen/StackMaps.cpp +++ b/lib/CodeGen/StackMaps.cpp @@ -7,77 +7,353 @@ // //===----------------------------------------------------------------------===// -#define DEBUG_TYPE "stackmaps" - #include "llvm/CodeGen/StackMaps.h" - #include "llvm/CodeGen/AsmPrinter.h" +#include "llvm/CodeGen/MachineFrameInfo.h" +#include "llvm/CodeGen/MachineFunction.h" #include "llvm/CodeGen/MachineInstr.h" +#include "llvm/IR/DataLayout.h" #include "llvm/MC/MCContext.h" #include "llvm/MC/MCExpr.h" +#include "llvm/MC/MCObjectFileInfo.h" #include "llvm/MC/MCSectionMachO.h" #include "llvm/MC/MCStreamer.h" +#include "llvm/Support/CommandLine.h" #include "llvm/Support/Debug.h" #include "llvm/Support/raw_ostream.h" -#include "llvm/Target/TargetOpcodes.h" #include "llvm/Target/TargetMachine.h" +#include "llvm/Target/TargetOpcodes.h" #include "llvm/Target/TargetRegisterInfo.h" - +#include "llvm/Target/TargetSubtargetInfo.h" #include using namespace llvm; -void StackMaps::recordStackMap(const MachineInstr &MI, uint32_t ID, - MachineInstr::const_mop_iterator MOI, - MachineInstr::const_mop_iterator MOE) { +#define DEBUG_TYPE "stackmaps" + +static cl::opt StackMapVersion("stackmap-version", cl::init(1), + cl::desc("Specify the stackmap encoding version (default = 1)")); + +const char *StackMaps::WSMP = "Stack Maps: "; + +PatchPointOpers::PatchPointOpers(const MachineInstr *MI) + : MI(MI), + HasDef(MI->getOperand(0).isReg() && MI->getOperand(0).isDef() && + !MI->getOperand(0).isImplicit()), + IsAnyReg(MI->getOperand(getMetaIdx(CCPos)).getImm() == CallingConv::AnyReg) +{ +#ifndef NDEBUG + unsigned CheckStartIdx = 0, e = MI->getNumOperands(); + while (CheckStartIdx < e && MI->getOperand(CheckStartIdx).isReg() && + MI->getOperand(CheckStartIdx).isDef() && + !MI->getOperand(CheckStartIdx).isImplicit()) + ++CheckStartIdx; + + assert(getMetaIdx() == CheckStartIdx && + "Unexpected additional definition in Patchpoint intrinsic."); +#endif +} + +unsigned PatchPointOpers::getNextScratchIdx(unsigned StartIdx) const { + if (!StartIdx) + StartIdx = getVarIdx(); + + // Find the next scratch register (implicit def and early clobber) + unsigned ScratchIdx = StartIdx, e = MI->getNumOperands(); + while (ScratchIdx < e && + !(MI->getOperand(ScratchIdx).isReg() && + MI->getOperand(ScratchIdx).isDef() && + MI->getOperand(ScratchIdx).isImplicit() && + MI->getOperand(ScratchIdx).isEarlyClobber())) + ++ScratchIdx; + + assert(ScratchIdx != e && "No scratch register available"); + return ScratchIdx; +} + +StackMaps::StackMaps(AsmPrinter &AP) : AP(AP) { + if (StackMapVersion != 1) + llvm_unreachable("Unsupported stackmap version!"); +} + +MachineInstr::const_mop_iterator +StackMaps::parseOperand(MachineInstr::const_mop_iterator MOI, + MachineInstr::const_mop_iterator MOE, + LocationVec &Locs, LiveOutVec &LiveOuts) const { + if (MOI->isImm()) { + switch (MOI->getImm()) { + default: llvm_unreachable("Unrecognized operand type."); + case StackMaps::DirectMemRefOp: { + unsigned Size = + AP.TM.getSubtargetImpl()->getDataLayout()->getPointerSizeInBits(); + assert((Size % 8) == 0 && "Need pointer size in bytes."); + Size /= 8; + unsigned Reg = (++MOI)->getReg(); + int64_t Imm = (++MOI)->getImm(); + Locs.push_back(Location(StackMaps::Location::Direct, Size, Reg, Imm)); + break; + } + case StackMaps::IndirectMemRefOp: { + int64_t Size = (++MOI)->getImm(); + assert(Size > 0 && "Need a valid size for indirect memory locations."); + unsigned Reg = (++MOI)->getReg(); + int64_t Imm = (++MOI)->getImm(); + Locs.push_back(Location(StackMaps::Location::Indirect, Size, Reg, Imm)); + break; + } + case StackMaps::ConstantOp: { + ++MOI; + assert(MOI->isImm() && "Expected constant operand."); + int64_t Imm = MOI->getImm(); + Locs.push_back(Location(Location::Constant, sizeof(int64_t), 0, Imm)); + break; + } + } + return ++MOI; + } + + // The physical register number will ultimately be encoded as a DWARF regno. + // The stack map also records the size of a spill slot that can hold the + // register content. (The runtime can track the actual size of the data type + // if it needs to.) + if (MOI->isReg()) { + // Skip implicit registers (this includes our scratch registers) + if (MOI->isImplicit()) + return ++MOI; + + assert(TargetRegisterInfo::isPhysicalRegister(MOI->getReg()) && + "Virtreg operands should have been rewritten before now."); + const TargetRegisterClass *RC = + AP.TM.getSubtargetImpl()->getRegisterInfo()->getMinimalPhysRegClass( + MOI->getReg()); + assert(!MOI->getSubReg() && "Physical subreg still around."); + Locs.push_back( + Location(Location::Register, RC->getSize(), MOI->getReg(), 0)); + return ++MOI; + } + + if (MOI->isRegLiveOut()) + LiveOuts = parseRegisterLiveOutMask(MOI->getRegLiveOut()); + + return ++MOI; +} + +/// Go up the super-register chain until we hit a valid dwarf register number. +static unsigned getDwarfRegNum(unsigned Reg, const TargetRegisterInfo *TRI) { + int RegNo = TRI->getDwarfRegNum(Reg, false); + for (MCSuperRegIterator SR(Reg, TRI); SR.isValid() && RegNo < 0; ++SR) + RegNo = TRI->getDwarfRegNum(*SR, false); + + assert(RegNo >= 0 && "Invalid Dwarf register number."); + return (unsigned) RegNo; +} + +/// Create a live-out register record for the given register Reg. +StackMaps::LiveOutReg +StackMaps::createLiveOutReg(unsigned Reg, const TargetRegisterInfo *TRI) const { + unsigned RegNo = getDwarfRegNum(Reg, TRI); + unsigned Size = TRI->getMinimalPhysRegClass(Reg)->getSize(); + return LiveOutReg(Reg, RegNo, Size); +} + +/// Parse the register live-out mask and return a vector of live-out registers +/// that need to be recorded in the stackmap. +StackMaps::LiveOutVec +StackMaps::parseRegisterLiveOutMask(const uint32_t *Mask) const { + assert(Mask && "No register mask specified"); + const TargetRegisterInfo *TRI = AP.TM.getSubtargetImpl()->getRegisterInfo(); + LiveOutVec LiveOuts; + + // Create a LiveOutReg for each bit that is set in the register mask. + for (unsigned Reg = 0, NumRegs = TRI->getNumRegs(); Reg != NumRegs; ++Reg) + if ((Mask[Reg / 32] >> Reg % 32) & 1) + LiveOuts.push_back(createLiveOutReg(Reg, TRI)); + + // We don't need to keep track of a register if its super-register is already + // in the list. Merge entries that refer to the same dwarf register and use + // the maximum size that needs to be spilled. + std::sort(LiveOuts.begin(), LiveOuts.end()); + for (LiveOutVec::iterator I = LiveOuts.begin(), E = LiveOuts.end(); + I != E; ++I) { + for (LiveOutVec::iterator II = std::next(I); II != E; ++II) { + if (I->RegNo != II->RegNo) { + // Skip all the now invalid entries. + I = --II; + break; + } + I->Size = std::max(I->Size, II->Size); + if (TRI->isSuperRegister(I->Reg, II->Reg)) + I->Reg = II->Reg; + II->MarkInvalid(); + } + } + LiveOuts.erase(std::remove_if(LiveOuts.begin(), LiveOuts.end(), + LiveOutReg::IsInvalid), LiveOuts.end()); + return LiveOuts; +} + +void StackMaps::recordStackMapOpers(const MachineInstr &MI, uint64_t ID, + MachineInstr::const_mop_iterator MOI, + MachineInstr::const_mop_iterator MOE, + bool recordResult) { MCContext &OutContext = AP.OutStreamer.getContext(); MCSymbol *MILabel = OutContext.CreateTempSymbol(); AP.OutStreamer.EmitLabel(MILabel); - LocationVec CallsiteLocs; + LocationVec Locations; + LiveOutVec LiveOuts; - while (MOI != MOE) { - std::pair ParseResult = - OpParser(MOI, MOE); + if (recordResult) { + assert(PatchPointOpers(&MI).hasDef() && "Stackmap has no return value."); + parseOperand(MI.operands_begin(), std::next(MI.operands_begin()), + Locations, LiveOuts); + } - Location &Loc = ParseResult.first; + // Parse operands. + while (MOI != MOE) { + MOI = parseOperand(MOI, MOE, Locations, LiveOuts); + } - // Move large constants into the constant pool. - if (Loc.LocType == Location::Constant && (Loc.Offset & ~0xFFFFFFFFULL)) { - Loc.LocType = Location::ConstantIndex; - Loc.Offset = ConstPool.getConstantIndex(Loc.Offset); + // Move large constants into the constant pool. + for (LocationVec::iterator I = Locations.begin(), E = Locations.end(); + I != E; ++I) { + // Constants are encoded as sign-extended integers. + // -1 is directly encoded as .long 0xFFFFFFFF with no constant pool. + if (I->LocType == Location::Constant && + ((I->Offset + (int64_t(1)<<31)) >> 32) != 0) { + I->LocType = Location::ConstantIndex; + auto Result = ConstPool.insert(std::make_pair(I->Offset, I->Offset)); + I->Offset = Result.first - ConstPool.begin(); } - - CallsiteLocs.push_back(Loc); - MOI = ParseResult.second; } + // Create an expression to calculate the offset of the callsite from function + // entry. const MCExpr *CSOffsetExpr = MCBinaryExpr::CreateSub( MCSymbolRefExpr::Create(MILabel, OutContext), MCSymbolRefExpr::Create(AP.CurrentFnSym, OutContext), OutContext); - CSInfos.push_back(CallsiteInfo(CSOffsetExpr, ID, CallsiteLocs)); + CSInfos.push_back(CallsiteInfo(CSOffsetExpr, ID, Locations, LiveOuts)); + + // Record the stack size of the current function. + const MachineFrameInfo *MFI = AP.MF->getFrameInfo(); + const TargetRegisterInfo *RegInfo = AP.MF->getSubtarget().getRegisterInfo(); + const bool DynamicFrameSize = MFI->hasVarSizedObjects() || + RegInfo->needsStackRealignment(*(AP.MF)); + FnStackSize[AP.CurrentFnSym] = + DynamicFrameSize ? UINT64_MAX : MFI->getStackSize(); +} + +void StackMaps::recordStackMap(const MachineInstr &MI) { + assert(MI.getOpcode() == TargetOpcode::STACKMAP && "expected stackmap"); + + int64_t ID = MI.getOperand(0).getImm(); + recordStackMapOpers(MI, ID, std::next(MI.operands_begin(), 2), + MI.operands_end()); } -/// serializeToStackMapSection conceptually populates the following fields: +void StackMaps::recordPatchPoint(const MachineInstr &MI) { + assert(MI.getOpcode() == TargetOpcode::PATCHPOINT && "expected patchpoint"); + + PatchPointOpers opers(&MI); + int64_t ID = opers.getMetaOper(PatchPointOpers::IDPos).getImm(); + + MachineInstr::const_mop_iterator MOI = + std::next(MI.operands_begin(), opers.getStackMapStartIdx()); + recordStackMapOpers(MI, ID, MOI, MI.operands_end(), + opers.isAnyReg() && opers.hasDef()); + +#ifndef NDEBUG + // verify anyregcc + LocationVec &Locations = CSInfos.back().Locations; + if (opers.isAnyReg()) { + unsigned NArgs = opers.getMetaOper(PatchPointOpers::NArgPos).getImm(); + for (unsigned i = 0, e = (opers.hasDef() ? NArgs+1 : NArgs); i != e; ++i) + assert(Locations[i].LocType == Location::Register && + "anyreg arg must be in reg."); + } +#endif +} + +/// Emit the stackmap header. /// -/// uint32 : Reserved (header) +/// Header { +/// uint8 : Stack Map Version (currently 1) +/// uint8 : Reserved (expected to be 0) +/// uint16 : Reserved (expected to be 0) +/// } +/// uint32 : NumFunctions /// uint32 : NumConstants -/// int64 : Constants[NumConstants] /// uint32 : NumRecords +void StackMaps::emitStackmapHeader(MCStreamer &OS) { + // Header. + OS.EmitIntValue(StackMapVersion, 1); // Version. + OS.EmitIntValue(0, 1); // Reserved. + OS.EmitIntValue(0, 2); // Reserved. + + // Num functions. + DEBUG(dbgs() << WSMP << "#functions = " << FnStackSize.size() << '\n'); + OS.EmitIntValue(FnStackSize.size(), 4); + // Num constants. + DEBUG(dbgs() << WSMP << "#constants = " << ConstPool.size() << '\n'); + OS.EmitIntValue(ConstPool.size(), 4); + // Num callsites. + DEBUG(dbgs() << WSMP << "#callsites = " << CSInfos.size() << '\n'); + OS.EmitIntValue(CSInfos.size(), 4); +} + +/// Emit the function frame record for each function. +/// +/// StkSizeRecord[NumFunctions] { +/// uint64 : Function Address +/// uint64 : Stack Size +/// } +void StackMaps::emitFunctionFrameRecords(MCStreamer &OS) { + // Function Frame records. + DEBUG(dbgs() << WSMP << "functions:\n"); + for (auto const &FR : FnStackSize) { + DEBUG(dbgs() << WSMP << "function addr: " << FR.first + << " frame size: " << FR.second); + OS.EmitSymbolValue(FR.first, 8); + OS.EmitIntValue(FR.second, 8); + } +} + +/// Emit the constant pool. +/// +/// int64 : Constants[NumConstants] +void StackMaps::emitConstantPoolEntries(MCStreamer &OS) { + // Constant pool entries. + DEBUG(dbgs() << WSMP << "constants:\n"); + for (auto ConstEntry : ConstPool) { + DEBUG(dbgs() << WSMP << ConstEntry.second << '\n'); + OS.EmitIntValue(ConstEntry.second, 8); + } +} + +/// Emit the callsite info for each callsite. +/// /// StkMapRecord[NumRecords] { -/// uint32 : PatchPoint ID +/// uint64 : PatchPoint ID /// uint32 : Instruction Offset /// uint16 : Reserved (record flags) /// uint16 : NumLocations /// Location[NumLocations] { /// uint8 : Register | Direct | Indirect | Constant | ConstantIndex -/// uint8 : Reserved (location flags) +/// uint8 : Size in Bytes /// uint16 : Dwarf RegNum /// int32 : Offset /// } +/// uint16 : Padding +/// uint16 : NumLiveOuts +/// LiveOuts[NumLiveOuts] { +/// uint16 : Dwarf RegNum +/// uint8 : Reserved +/// uint8 : Size in Bytes +/// } +/// uint32 : Padding (only if required to align to 8 byte) /// } /// /// Location Encoding, Type, Value: @@ -86,128 +362,154 @@ void StackMaps::recordStackMap(const MachineInstr &MI, uint32_t ID, /// 0x3, Indirect, [Reg + Offset] (spilled value) /// 0x4, Constant, Offset (small constant) /// 0x5, ConstIndex, Constants[Offset] (large constant) -/// -void StackMaps::serializeToStackMapSection() { - // Bail out if there's no stack map data. - if (CSInfos.empty()) - return; - - MCContext &OutContext = AP.OutStreamer.getContext(); - const TargetRegisterInfo *TRI = AP.TM.getRegisterInfo(); - - // Create the section. - const MCSection *StackMapSection = - OutContext.getObjectFileInfo().getStackMapSection(); - AP.OutStreamer.SwitchSection(StackMapSection); - - // Emit a dummy symbol to force section inclusion. - AP.OutStreamer.EmitLabel( - OutContext.GetOrCreateSymbol(Twine("__LLVM_StackMaps"))); - - // Serialize data. - const char *WSMP = "Stack Maps: "; - (void)WSMP; - const MCRegisterInfo &MCRI = *OutContext.getRegisterInfo(); - - DEBUG(dbgs() << "********** Stack Map Output **********\n"); +void StackMaps::emitCallsiteEntries(MCStreamer &OS, + const TargetRegisterInfo *TRI) { + // Callsite entries. + DEBUG(dbgs() << WSMP << "callsites:\n"); + for (const auto &CSI : CSInfos) { + const LocationVec &CSLocs = CSI.Locations; + const LiveOutVec &LiveOuts = CSI.LiveOuts; - // Header. - AP.OutStreamer.EmitIntValue(0, 4); - - // Num constants. - AP.OutStreamer.EmitIntValue(ConstPool.getNumConstants(), 4); - - // Constant pool entries. - for (unsigned i = 0; i < ConstPool.getNumConstants(); ++i) - AP.OutStreamer.EmitIntValue(ConstPool.getConstant(i), 8); - - DEBUG(dbgs() << WSMP << "#callsites = " << CSInfos.size() << "\n"); - AP.OutStreamer.EmitIntValue(CSInfos.size(), 4); - - for (CallsiteInfoList::const_iterator CSII = CSInfos.begin(), - CSIE = CSInfos.end(); - CSII != CSIE; ++CSII) { - - unsigned CallsiteID = CSII->ID; - const LocationVec &CSLocs = CSII->Locations; - - DEBUG(dbgs() << WSMP << "callsite " << CallsiteID << "\n"); + DEBUG(dbgs() << WSMP << "callsite " << CSI.ID << "\n"); // Verify stack map entry. It's better to communicate a problem to the // runtime than crash in case of in-process compilation. Currently, we do // simple overflow checks, but we may eventually communicate other // compilation errors this way. - if (CSLocs.size() > UINT16_MAX) { - AP.OutStreamer.EmitIntValue(UINT32_MAX, 4); // Invalid ID. - AP.OutStreamer.EmitValue(CSII->CSOffsetExpr, 4); - AP.OutStreamer.EmitIntValue(0, 2); // Reserved. - AP.OutStreamer.EmitIntValue(0, 2); // 0 locations. + if (CSLocs.size() > UINT16_MAX || LiveOuts.size() > UINT16_MAX) { + OS.EmitIntValue(UINT64_MAX, 8); // Invalid ID. + OS.EmitValue(CSI.CSOffsetExpr, 4); + OS.EmitIntValue(0, 2); // Reserved. + OS.EmitIntValue(0, 2); // 0 locations. + OS.EmitIntValue(0, 2); // padding. + OS.EmitIntValue(0, 2); // 0 live-out registers. + OS.EmitIntValue(0, 4); // padding. continue; } - AP.OutStreamer.EmitIntValue(CallsiteID, 4); - AP.OutStreamer.EmitValue(CSII->CSOffsetExpr, 4); + OS.EmitIntValue(CSI.ID, 8); + OS.EmitValue(CSI.CSOffsetExpr, 4); // Reserved for flags. - AP.OutStreamer.EmitIntValue(0, 2); + OS.EmitIntValue(0, 2); DEBUG(dbgs() << WSMP << " has " << CSLocs.size() << " locations\n"); - AP.OutStreamer.EmitIntValue(CSLocs.size(), 2); - - unsigned operIdx = 0; - for (LocationVec::const_iterator LocI = CSLocs.begin(), LocE = CSLocs.end(); - LocI != LocE; ++LocI, ++operIdx) { - const Location &Loc = *LocI; - DEBUG( - dbgs() << WSMP << " Loc " << operIdx << ": "; - switch (Loc.LocType) { - case Location::Unprocessed: - dbgs() << ""; - break; - case Location::Register: - dbgs() << "Register " << MCRI.getName(Loc.Reg); - break; - case Location::Direct: - dbgs() << "Direct " << MCRI.getName(Loc.Reg); - if (Loc.Offset) - dbgs() << " + " << Loc.Offset; - break; - case Location::Indirect: - dbgs() << "Indirect " << MCRI.getName(Loc.Reg) - << " + " << Loc.Offset; - break; - case Location::Constant: - dbgs() << "Constant " << Loc.Offset; - break; - case Location::ConstantIndex: - dbgs() << "Constant Index " << Loc.Offset; - break; - } - dbgs() << "\n"; - ); + OS.EmitIntValue(CSLocs.size(), 2); + unsigned OperIdx = 0; + for (const auto &Loc : CSLocs) { unsigned RegNo = 0; + int Offset = Loc.Offset; if(Loc.Reg) { - RegNo = MCRI.getDwarfRegNum(Loc.Reg, false); - for (MCSuperRegIterator SR(Loc.Reg, TRI); - SR.isValid() && (int)RegNo < 0; ++SR) { - RegNo = TRI->getDwarfRegNum(*SR, false); + RegNo = getDwarfRegNum(Loc.Reg, TRI); + + // If this is a register location, put the subregister byte offset in + // the location offset. + if (Loc.LocType == Location::Register) { + assert(!Loc.Offset && "Register location should have zero offset"); + unsigned LLVMRegNo = TRI->getLLVMRegNum(RegNo, false); + unsigned SubRegIdx = TRI->getSubRegIndex(LLVMRegNo, Loc.Reg); + if (SubRegIdx) + Offset = TRI->getSubRegIdxOffset(SubRegIdx); } } else { - assert((Loc.LocType != Location::Register - && Loc.LocType != Location::Register) && + assert(Loc.LocType != Location::Register && "Missing location register"); } - AP.OutStreamer.EmitIntValue(Loc.LocType, 1); - AP.OutStreamer.EmitIntValue(0, 1); // Reserved location flags. - AP.OutStreamer.EmitIntValue(RegNo, 2); - AP.OutStreamer.EmitIntValue(Loc.Offset, 4); + + DEBUG(dbgs() << WSMP << " Loc " << OperIdx << ": "; + switch (Loc.LocType) { + case Location::Unprocessed: + dbgs() << ""; + break; + case Location::Register: + dbgs() << "Register " << TRI->getName(Loc.Reg); + break; + case Location::Direct: + dbgs() << "Direct " << TRI->getName(Loc.Reg); + if (Loc.Offset) + dbgs() << " + " << Loc.Offset; + break; + case Location::Indirect: + dbgs() << "Indirect " << TRI->getName(Loc.Reg) + << " + " << Loc.Offset; + break; + case Location::Constant: + dbgs() << "Constant " << Loc.Offset; + break; + case Location::ConstantIndex: + dbgs() << "Constant Index " << Loc.Offset; + break; + } + dbgs() << " [encoding: .byte " << Loc.LocType + << ", .byte " << Loc.Size + << ", .short " << RegNo + << ", .int " << Offset << "]\n"; + ); + + OS.EmitIntValue(Loc.LocType, 1); + OS.EmitIntValue(Loc.Size, 1); + OS.EmitIntValue(RegNo, 2); + OS.EmitIntValue(Offset, 4); + OperIdx++; } + + DEBUG(dbgs() << WSMP << " has " << LiveOuts.size() + << " live-out registers\n"); + + // Num live-out registers and padding to align to 4 byte. + OS.EmitIntValue(0, 2); + OS.EmitIntValue(LiveOuts.size(), 2); + + OperIdx = 0; + for (const auto &LO : LiveOuts) { + DEBUG(dbgs() << WSMP << " LO " << OperIdx << ": " + << TRI->getName(LO.Reg) + << " [encoding: .short " << LO.RegNo + << ", .byte 0, .byte " << LO.Size << "]\n"); + OS.EmitIntValue(LO.RegNo, 2); + OS.EmitIntValue(0, 1); + OS.EmitIntValue(LO.Size, 1); + } + // Emit alignment to 8 byte. + OS.EmitValueToAlignment(8); } +} - AP.OutStreamer.AddBlankLine(); +/// Serialize the stackmap data. +void StackMaps::serializeToStackMapSection() { + (void) WSMP; + // Bail out if there's no stack map data. + assert((!CSInfos.empty() || (CSInfos.empty() && ConstPool.empty())) && + "Expected empty constant pool too!"); + assert((!CSInfos.empty() || (CSInfos.empty() && FnStackSize.empty())) && + "Expected empty function record too!"); + if (CSInfos.empty()) + return; + + MCContext &OutContext = AP.OutStreamer.getContext(); + MCStreamer &OS = AP.OutStreamer; + const TargetRegisterInfo *TRI = AP.TM.getSubtargetImpl()->getRegisterInfo(); + + // Create the section. + const MCSection *StackMapSection = + OutContext.getObjectFileInfo()->getStackMapSection(); + OS.SwitchSection(StackMapSection); + + // Emit a dummy symbol to force section inclusion. + OS.EmitLabel(OutContext.GetOrCreateSymbol(Twine("__LLVM_StackMaps"))); + + // Serialize data. + DEBUG(dbgs() << "********** Stack Map Output **********\n"); + emitStackmapHeader(OS); + emitFunctionFrameRecords(OS); + emitConstantPoolEntries(OS); + emitCallsiteEntries(OS, TRI); + OS.AddBlankLine(); + // Clean up. CSInfos.clear(); + ConstPool.clear(); }