| //===-- NVPTXAsmPrinter.h - NVPTX LLVM assembly writer --------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file contains a printer that converts from our internal representation |
| // of machine-dependent LLVM code to NVPTX assembly language. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef NVPTXASMPRINTER_H |
| #define NVPTXASMPRINTER_H |
| |
| #include "NVPTX.h" |
| #include "NVPTXSubtarget.h" |
| #include "NVPTXTargetMachine.h" |
| #include "llvm/ADT/SmallString.h" |
| #include "llvm/ADT/StringExtras.h" |
| #include "llvm/CodeGen/AsmPrinter.h" |
| #include "llvm/IR/Function.h" |
| #include "llvm/MC/MCAsmInfo.h" |
| #include "llvm/MC/MCExpr.h" |
| #include "llvm/MC/MCSymbol.h" |
| #include "llvm/Support/CommandLine.h" |
| #include "llvm/Support/FormattedStream.h" |
| #include "llvm/Target/TargetMachine.h" |
| #include <fstream> |
| |
| // The ptx syntax and format is very different from that usually seem in a .s |
| // file, |
| // therefore we are not able to use the MCAsmStreamer interface here. |
| // |
| // We are handcrafting the output method here. |
| // |
| // A better approach is to clone the MCAsmStreamer to a MCPTXAsmStreamer |
| // (subclass of MCStreamer). |
| |
| // This is defined in AsmPrinter.cpp. |
| // Used to process the constant expressions in initializers. |
| namespace nvptx { |
| const llvm::MCExpr * |
| LowerConstant(const llvm::Constant *CV, llvm::AsmPrinter &AP); |
| } |
| |
| namespace llvm { |
| |
| class LineReader { |
| private: |
| unsigned theCurLine; |
| std::ifstream fstr; |
| char buff[512]; |
| std::string theFileName; |
| SmallVector<unsigned, 32> lineOffset; |
| public: |
| LineReader(std::string filename) { |
| theCurLine = 0; |
| fstr.open(filename.c_str()); |
| theFileName = filename; |
| } |
| std::string fileName() { return theFileName; } |
| ~LineReader() { fstr.close(); } |
| std::string readLine(unsigned line); |
| }; |
| |
| class LLVM_LIBRARY_VISIBILITY NVPTXAsmPrinter : public AsmPrinter { |
| |
| class AggBuffer { |
| // Used to buffer the emitted string for initializing global |
| // aggregates. |
| // |
| // Normally an aggregate (array, vector or structure) is emitted |
| // as a u8[]. However, if one element/field of the aggregate |
| // is a non-NULL address, then the aggregate is emitted as u32[] |
| // or u64[]. |
| // |
| // We first layout the aggregate in 'buffer' in bytes, except for |
| // those symbol addresses. For the i-th symbol address in the |
| //aggregate, its corresponding 4-byte or 8-byte elements in 'buffer' |
| // are filled with 0s. symbolPosInBuffer[i-1] records its position |
| // in 'buffer', and Symbols[i-1] records the Value*. |
| // |
| // Once we have this AggBuffer setup, we can choose how to print |
| // it out. |
| public: |
| unsigned size; // size of the buffer in bytes |
| unsigned char *buffer; // the buffer |
| unsigned numSymbols; // number of symbol addresses |
| SmallVector<unsigned, 4> symbolPosInBuffer; |
| SmallVector<const Value *, 4> Symbols; |
| |
| private: |
| unsigned curpos; |
| raw_ostream &O; |
| NVPTXAsmPrinter &AP; |
| bool EmitGeneric; |
| |
| public: |
| AggBuffer(unsigned _size, raw_ostream &_O, NVPTXAsmPrinter &_AP) |
| : O(_O), AP(_AP) { |
| buffer = new unsigned char[_size]; |
| size = _size; |
| curpos = 0; |
| numSymbols = 0; |
| EmitGeneric = AP.EmitGeneric; |
| } |
| ~AggBuffer() { delete[] buffer; } |
| unsigned addBytes(unsigned char *Ptr, int Num, int Bytes) { |
| assert((curpos + Num) <= size); |
| assert((curpos + Bytes) <= size); |
| for (int i = 0; i < Num; ++i) { |
| buffer[curpos] = Ptr[i]; |
| curpos++; |
| } |
| for (int i = Num; i < Bytes; ++i) { |
| buffer[curpos] = 0; |
| curpos++; |
| } |
| return curpos; |
| } |
| unsigned addZeros(int Num) { |
| assert((curpos + Num) <= size); |
| for (int i = 0; i < Num; ++i) { |
| buffer[curpos] = 0; |
| curpos++; |
| } |
| return curpos; |
| } |
| void addSymbol(const Value *GVar) { |
| symbolPosInBuffer.push_back(curpos); |
| Symbols.push_back(GVar); |
| numSymbols++; |
| } |
| void print() { |
| if (numSymbols == 0) { |
| // print out in bytes |
| for (unsigned i = 0; i < size; i++) { |
| if (i) |
| O << ", "; |
| O << (unsigned int) buffer[i]; |
| } |
| } else { |
| // print out in 4-bytes or 8-bytes |
| unsigned int pos = 0; |
| unsigned int nSym = 0; |
| unsigned int nextSymbolPos = symbolPosInBuffer[nSym]; |
| unsigned int nBytes = 4; |
| if (AP.nvptxSubtarget.is64Bit()) |
| nBytes = 8; |
| for (pos = 0; pos < size; pos += nBytes) { |
| if (pos) |
| O << ", "; |
| if (pos == nextSymbolPos) { |
| const Value *v = Symbols[nSym]; |
| if (const GlobalValue *GVar = dyn_cast<GlobalValue>(v)) { |
| MCSymbol *Name = AP.getSymbol(GVar); |
| PointerType *PTy = dyn_cast<PointerType>(GVar->getType()); |
| bool IsNonGenericPointer = false; |
| if (PTy && PTy->getAddressSpace() != 0) { |
| IsNonGenericPointer = true; |
| } |
| if (EmitGeneric && !isa<Function>(v) && !IsNonGenericPointer) { |
| O << "generic("; |
| O << *Name; |
| O << ")"; |
| } else { |
| O << *Name; |
| } |
| } else if (const ConstantExpr *Cexpr = dyn_cast<ConstantExpr>(v)) { |
| O << *nvptx::LowerConstant(Cexpr, AP); |
| } else |
| llvm_unreachable("symbol type unknown"); |
| nSym++; |
| if (nSym >= numSymbols) |
| nextSymbolPos = size + 1; |
| else |
| nextSymbolPos = symbolPosInBuffer[nSym]; |
| } else if (nBytes == 4) |
| O << *(unsigned int *)(buffer + pos); |
| else |
| O << *(unsigned long long *)(buffer + pos); |
| } |
| } |
| } |
| }; |
| |
| friend class AggBuffer; |
| |
| void emitSrcInText(StringRef filename, unsigned line); |
| |
| private: |
| const char *getPassName() const override { return "NVPTX Assembly Printer"; } |
| |
| const Function *F; |
| std::string CurrentFnName; |
| |
| void EmitFunctionEntryLabel() override; |
| void EmitFunctionBodyStart() override; |
| void EmitFunctionBodyEnd() override; |
| void emitImplicitDef(const MachineInstr *MI) const override; |
| |
| void EmitInstruction(const MachineInstr *) override; |
| void lowerToMCInst(const MachineInstr *MI, MCInst &OutMI); |
| bool lowerOperand(const MachineOperand &MO, MCOperand &MCOp); |
| MCOperand GetSymbolRef(const MCSymbol *Symbol); |
| unsigned encodeVirtualRegister(unsigned Reg); |
| |
| void EmitAlignment(unsigned NumBits, const GlobalValue *GV = nullptr) const {} |
| |
| void printVecModifiedImmediate(const MachineOperand &MO, const char *Modifier, |
| raw_ostream &O); |
| void printMemOperand(const MachineInstr *MI, int opNum, raw_ostream &O, |
| const char *Modifier = nullptr); |
| void printImplicitDef(const MachineInstr *MI, raw_ostream &O) const; |
| void printModuleLevelGV(const GlobalVariable *GVar, raw_ostream &O, |
| bool = false); |
| void printParamName(int paramIndex, raw_ostream &O); |
| void printParamName(Function::const_arg_iterator I, int paramIndex, |
| raw_ostream &O); |
| void emitGlobals(const Module &M); |
| void emitHeader(Module &M, raw_ostream &O); |
| void emitKernelFunctionDirectives(const Function &F, raw_ostream &O) const; |
| void emitVirtualRegister(unsigned int vr, raw_ostream &); |
| void emitFunctionExternParamList(const MachineFunction &MF); |
| void emitFunctionParamList(const Function *, raw_ostream &O); |
| void emitFunctionParamList(const MachineFunction &MF, raw_ostream &O); |
| void setAndEmitFunctionVirtualRegisters(const MachineFunction &MF); |
| void emitFunctionTempData(const MachineFunction &MF, unsigned &FrameSize); |
| bool isImageType(const Type *Ty); |
| void printReturnValStr(const Function *, raw_ostream &O); |
| void printReturnValStr(const MachineFunction &MF, raw_ostream &O); |
| bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo, |
| unsigned AsmVariant, const char *ExtraCode, |
| raw_ostream &) override; |
| void printOperand(const MachineInstr *MI, int opNum, raw_ostream &O, |
| const char *Modifier = nullptr); |
| bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo, |
| unsigned AsmVariant, const char *ExtraCode, |
| raw_ostream &) override; |
| protected: |
| bool doInitialization(Module &M) override; |
| bool doFinalization(Module &M) override; |
| |
| private: |
| std::string CurrentBankselLabelInBasicBlock; |
| |
| bool GlobalsEmitted; |
| |
| // This is specific per MachineFunction. |
| const MachineRegisterInfo *MRI; |
| // The contents are specific for each |
| // MachineFunction. But the size of the |
| // array is not. |
| typedef DenseMap<unsigned, unsigned> VRegMap; |
| typedef DenseMap<const TargetRegisterClass *, VRegMap> VRegRCMap; |
| VRegRCMap VRegMapping; |
| // cache the subtarget here. |
| const NVPTXSubtarget &nvptxSubtarget; |
| // Build the map between type name and ID based on module's type |
| // symbol table. |
| std::map<const Type *, std::string> TypeNameMap; |
| |
| // List of variables demoted to a function scope. |
| std::map<const Function *, std::vector<const GlobalVariable *> > localDecls; |
| |
| // To record filename to ID mapping |
| std::map<std::string, unsigned> filenameMap; |
| void recordAndEmitFilenames(Module &); |
| |
| void emitPTXGlobalVariable(const GlobalVariable *GVar, raw_ostream &O); |
| void emitPTXAddressSpace(unsigned int AddressSpace, raw_ostream &O) const; |
| std::string getPTXFundamentalTypeStr(const Type *Ty, bool = true) const; |
| void printScalarConstant(const Constant *CPV, raw_ostream &O); |
| void printFPConstant(const ConstantFP *Fp, raw_ostream &O); |
| void bufferLEByte(const Constant *CPV, int Bytes, AggBuffer *aggBuffer); |
| void bufferAggregateConstant(const Constant *CV, AggBuffer *aggBuffer); |
| |
| void printOperandProper(const MachineOperand &MO); |
| |
| void emitLinkageDirective(const GlobalValue *V, raw_ostream &O); |
| void emitDeclarations(const Module &, raw_ostream &O); |
| void emitDeclaration(const Function *, raw_ostream &O); |
| |
| static const char *getRegisterName(unsigned RegNo); |
| void emitDemotedVars(const Function *, raw_ostream &); |
| |
| bool lowerImageHandleOperand(const MachineInstr *MI, unsigned OpNo, |
| MCOperand &MCOp); |
| void lowerImageHandleSymbol(unsigned Index, MCOperand &MCOp); |
| |
| LineReader *reader; |
| LineReader *getReader(std::string); |
| |
| // Used to control the need to emit .generic() in the initializer of |
| // module scope variables. |
| // Although ptx supports the hybrid mode like the following, |
| // .global .u32 a; |
| // .global .u32 b; |
| // .global .u32 addr[] = {a, generic(b)} |
| // we have difficulty representing the difference in the NVVM IR. |
| // |
| // Since the address value should always be generic in CUDA C and always |
| // be specific in OpenCL, we use this simple control here. |
| // |
| bool EmitGeneric; |
| |
| public: |
| NVPTXAsmPrinter(TargetMachine &TM, MCStreamer &Streamer) |
| : AsmPrinter(TM, Streamer), |
| nvptxSubtarget(TM.getSubtarget<NVPTXSubtarget>()) { |
| CurrentBankselLabelInBasicBlock = ""; |
| reader = nullptr; |
| EmitGeneric = (nvptxSubtarget.getDrvInterface() == NVPTX::CUDA); |
| } |
| |
| ~NVPTXAsmPrinter() { |
| if (!reader) |
| delete reader; |
| } |
| |
| bool ignoreLoc(const MachineInstr &); |
| |
| std::string getVirtualRegisterName(unsigned) const; |
| |
| DebugLoc prevDebugLoc; |
| void emitLineNumberAsDotLoc(const MachineInstr &); |
| }; |
| } // end of namespace |
| |
| #endif |