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https://github.com/c64scene-ar/llvm-6502.git
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9d2ea22e2b
This involved moving two non-subtarget dependent features (64-bitness and the driver interface) to the NVPTX target machine and updating the uses (or migrating around the subtarget use for ease of review). Otherwise use the cached subtarget or create a default subtarget based on the TargetMachine cpu and feature string for the module level assembler emission. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229785 91177308-0d34-0410-b5e6-96231b3b80d8
338 lines
12 KiB
C++
338 lines
12 KiB
C++
//===-- NVPTXAsmPrinter.h - NVPTX LLVM assembly writer --------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains a printer that converts from our internal representation
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// of machine-dependent LLVM code to NVPTX assembly language.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_NVPTX_NVPTXASMPRINTER_H
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#define LLVM_LIB_TARGET_NVPTX_NVPTXASMPRINTER_H
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#include "NVPTX.h"
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#include "NVPTXSubtarget.h"
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#include "NVPTXTargetMachine.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/IR/Function.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/FormattedStream.h"
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#include "llvm/Target/TargetMachine.h"
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#include <fstream>
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// The ptx syntax and format is very different from that usually seem in a .s
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// file,
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// therefore we are not able to use the MCAsmStreamer interface here.
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//
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// We are handcrafting the output method here.
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//
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// A better approach is to clone the MCAsmStreamer to a MCPTXAsmStreamer
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// (subclass of MCStreamer).
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namespace llvm {
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class LineReader {
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private:
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unsigned theCurLine;
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std::ifstream fstr;
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char buff[512];
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std::string theFileName;
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SmallVector<unsigned, 32> lineOffset;
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public:
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LineReader(std::string filename) {
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theCurLine = 0;
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fstr.open(filename.c_str());
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theFileName = filename;
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}
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std::string fileName() { return theFileName; }
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~LineReader() { fstr.close(); }
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std::string readLine(unsigned line);
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};
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class LLVM_LIBRARY_VISIBILITY NVPTXAsmPrinter : public AsmPrinter {
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class AggBuffer {
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// Used to buffer the emitted string for initializing global
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// aggregates.
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//
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// Normally an aggregate (array, vector or structure) is emitted
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// as a u8[]. However, if one element/field of the aggregate
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// is a non-NULL address, then the aggregate is emitted as u32[]
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// or u64[].
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//
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// We first layout the aggregate in 'buffer' in bytes, except for
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// those symbol addresses. For the i-th symbol address in the
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//aggregate, its corresponding 4-byte or 8-byte elements in 'buffer'
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// are filled with 0s. symbolPosInBuffer[i-1] records its position
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// in 'buffer', and Symbols[i-1] records the Value*.
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//
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// Once we have this AggBuffer setup, we can choose how to print
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// it out.
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public:
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unsigned numSymbols; // number of symbol addresses
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private:
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const unsigned size; // size of the buffer in bytes
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std::vector<unsigned char> buffer; // the buffer
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SmallVector<unsigned, 4> symbolPosInBuffer;
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SmallVector<const Value *, 4> Symbols;
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unsigned curpos;
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raw_ostream &O;
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NVPTXAsmPrinter &AP;
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bool EmitGeneric;
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public:
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AggBuffer(unsigned _size, raw_ostream &_O, NVPTXAsmPrinter &_AP)
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: size(_size), buffer(_size), O(_O), AP(_AP) {
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curpos = 0;
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numSymbols = 0;
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EmitGeneric = AP.EmitGeneric;
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}
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unsigned addBytes(unsigned char *Ptr, int Num, int Bytes) {
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assert((curpos + Num) <= size);
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assert((curpos + Bytes) <= size);
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for (int i = 0; i < Num; ++i) {
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buffer[curpos] = Ptr[i];
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curpos++;
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}
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for (int i = Num; i < Bytes; ++i) {
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buffer[curpos] = 0;
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curpos++;
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}
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return curpos;
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}
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unsigned addZeros(int Num) {
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assert((curpos + Num) <= size);
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for (int i = 0; i < Num; ++i) {
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buffer[curpos] = 0;
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curpos++;
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}
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return curpos;
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}
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void addSymbol(const Value *GVar) {
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symbolPosInBuffer.push_back(curpos);
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Symbols.push_back(GVar);
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numSymbols++;
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}
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void print() {
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if (numSymbols == 0) {
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// print out in bytes
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for (unsigned i = 0; i < size; i++) {
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if (i)
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O << ", ";
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O << (unsigned int) buffer[i];
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}
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} else {
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// print out in 4-bytes or 8-bytes
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unsigned int pos = 0;
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unsigned int nSym = 0;
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unsigned int nextSymbolPos = symbolPosInBuffer[nSym];
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unsigned int nBytes = 4;
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if (static_cast<const NVPTXTargetMachine &>(AP.TM).is64Bit())
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nBytes = 8;
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for (pos = 0; pos < size; pos += nBytes) {
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if (pos)
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O << ", ";
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if (pos == nextSymbolPos) {
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const Value *v = Symbols[nSym];
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if (const GlobalValue *GVar = dyn_cast<GlobalValue>(v)) {
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MCSymbol *Name = AP.getSymbol(GVar);
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PointerType *PTy = dyn_cast<PointerType>(GVar->getType());
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bool IsNonGenericPointer = false;
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if (PTy && PTy->getAddressSpace() != 0) {
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IsNonGenericPointer = true;
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}
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if (EmitGeneric && !isa<Function>(v) && !IsNonGenericPointer) {
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O << "generic(";
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O << *Name;
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O << ")";
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} else {
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O << *Name;
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}
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} else if (const ConstantExpr *Cexpr = dyn_cast<ConstantExpr>(v)) {
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O << *AP.lowerConstant(Cexpr);
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} else
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llvm_unreachable("symbol type unknown");
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nSym++;
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if (nSym >= numSymbols)
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nextSymbolPos = size + 1;
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else
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nextSymbolPos = symbolPosInBuffer[nSym];
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} else if (nBytes == 4)
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O << *(unsigned int *)(&buffer[pos]);
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else
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O << *(unsigned long long *)(&buffer[pos]);
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}
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}
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}
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};
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friend class AggBuffer;
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void emitSrcInText(StringRef filename, unsigned line);
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private:
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const char *getPassName() const override { return "NVPTX Assembly Printer"; }
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const Function *F;
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std::string CurrentFnName;
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void EmitBasicBlockStart(const MachineBasicBlock &MBB) const override;
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void EmitFunctionEntryLabel() override;
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void EmitFunctionBodyStart() override;
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void EmitFunctionBodyEnd() override;
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void emitImplicitDef(const MachineInstr *MI) const override;
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void EmitInstruction(const MachineInstr *) override;
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void lowerToMCInst(const MachineInstr *MI, MCInst &OutMI);
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bool lowerOperand(const MachineOperand &MO, MCOperand &MCOp);
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MCOperand GetSymbolRef(const MCSymbol *Symbol);
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unsigned encodeVirtualRegister(unsigned Reg);
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void EmitAlignment(unsigned NumBits, const GlobalValue *GV = nullptr) const {}
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void printVecModifiedImmediate(const MachineOperand &MO, const char *Modifier,
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raw_ostream &O);
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void printMemOperand(const MachineInstr *MI, int opNum, raw_ostream &O,
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const char *Modifier = nullptr);
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void printImplicitDef(const MachineInstr *MI, raw_ostream &O) const;
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void printModuleLevelGV(const GlobalVariable *GVar, raw_ostream &O,
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bool = false);
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void printParamName(int paramIndex, raw_ostream &O);
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void printParamName(Function::const_arg_iterator I, int paramIndex,
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raw_ostream &O);
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void emitGlobals(const Module &M);
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void emitHeader(Module &M, raw_ostream &O, const NVPTXSubtarget &STI);
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void emitKernelFunctionDirectives(const Function &F, raw_ostream &O) const;
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void emitVirtualRegister(unsigned int vr, raw_ostream &);
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void emitFunctionExternParamList(const MachineFunction &MF);
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void emitFunctionParamList(const Function *, raw_ostream &O);
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void emitFunctionParamList(const MachineFunction &MF, raw_ostream &O);
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void setAndEmitFunctionVirtualRegisters(const MachineFunction &MF);
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void emitFunctionTempData(const MachineFunction &MF, unsigned &FrameSize);
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bool isImageType(const Type *Ty);
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void printReturnValStr(const Function *, raw_ostream &O);
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void printReturnValStr(const MachineFunction &MF, raw_ostream &O);
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bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant, const char *ExtraCode,
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raw_ostream &) override;
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void printOperand(const MachineInstr *MI, int opNum, raw_ostream &O,
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const char *Modifier = nullptr);
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bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
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unsigned AsmVariant, const char *ExtraCode,
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raw_ostream &) override;
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protected:
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bool doInitialization(Module &M) override;
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bool doFinalization(Module &M) override;
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private:
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std::string CurrentBankselLabelInBasicBlock;
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bool GlobalsEmitted;
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// This is specific per MachineFunction.
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const MachineRegisterInfo *MRI;
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// The contents are specific for each
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// MachineFunction. But the size of the
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// array is not.
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typedef DenseMap<unsigned, unsigned> VRegMap;
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typedef DenseMap<const TargetRegisterClass *, VRegMap> VRegRCMap;
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VRegRCMap VRegMapping;
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// Cache the subtarget here.
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const NVPTXSubtarget *nvptxSubtarget;
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// Build the map between type name and ID based on module's type
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// symbol table.
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std::map<const Type *, std::string> TypeNameMap;
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// List of variables demoted to a function scope.
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std::map<const Function *, std::vector<const GlobalVariable *> > localDecls;
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// To record filename to ID mapping
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std::map<std::string, unsigned> filenameMap;
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void recordAndEmitFilenames(Module &);
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void emitPTXGlobalVariable(const GlobalVariable *GVar, raw_ostream &O);
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void emitPTXAddressSpace(unsigned int AddressSpace, raw_ostream &O) const;
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std::string getPTXFundamentalTypeStr(const Type *Ty, bool = true) const;
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void printScalarConstant(const Constant *CPV, raw_ostream &O);
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void printFPConstant(const ConstantFP *Fp, raw_ostream &O);
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void bufferLEByte(const Constant *CPV, int Bytes, AggBuffer *aggBuffer);
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void bufferAggregateConstant(const Constant *CV, AggBuffer *aggBuffer);
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void printOperandProper(const MachineOperand &MO);
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void emitLinkageDirective(const GlobalValue *V, raw_ostream &O);
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void emitDeclarations(const Module &, raw_ostream &O);
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void emitDeclaration(const Function *, raw_ostream &O);
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static const char *getRegisterName(unsigned RegNo);
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void emitDemotedVars(const Function *, raw_ostream &);
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bool lowerImageHandleOperand(const MachineInstr *MI, unsigned OpNo,
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MCOperand &MCOp);
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void lowerImageHandleSymbol(unsigned Index, MCOperand &MCOp);
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bool isLoopHeaderOfNoUnroll(const MachineBasicBlock &MBB) const;
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LineReader *reader;
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LineReader *getReader(std::string);
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// Used to control the need to emit .generic() in the initializer of
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// module scope variables.
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// Although ptx supports the hybrid mode like the following,
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// .global .u32 a;
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// .global .u32 b;
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// .global .u32 addr[] = {a, generic(b)}
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// we have difficulty representing the difference in the NVVM IR.
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//
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// Since the address value should always be generic in CUDA C and always
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// be specific in OpenCL, we use this simple control here.
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//
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bool EmitGeneric;
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public:
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NVPTXAsmPrinter(TargetMachine &TM, std::unique_ptr<MCStreamer> Streamer)
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: AsmPrinter(TM, std::move(Streamer)),
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EmitGeneric(static_cast<NVPTXTargetMachine &>(TM).getDrvInterface() ==
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NVPTX::CUDA) {
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CurrentBankselLabelInBasicBlock = "";
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reader = nullptr;
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}
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~NVPTXAsmPrinter() {
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if (!reader)
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delete reader;
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}
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bool runOnMachineFunction(MachineFunction &F) override {
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nvptxSubtarget = &F.getSubtarget<NVPTXSubtarget>();
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return AsmPrinter::runOnMachineFunction(F);
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}
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.addRequired<MachineLoopInfo>();
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AsmPrinter::getAnalysisUsage(AU);
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}
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bool ignoreLoc(const MachineInstr &);
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std::string getVirtualRegisterName(unsigned) const;
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DebugLoc prevDebugLoc;
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void emitLineNumberAsDotLoc(const MachineInstr &);
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};
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} // end of namespace
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#endif
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