llvm-project/llvm/lib/Target/NVPTX/NVPTXAsmPrinter.h

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//===-- 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/Mangler.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<Value *, 4> Symbols;
private:
unsigned curpos;
raw_ostream &O;
NVPTXAsmPrinter &AP;
public:
AggBuffer(unsigned _size, raw_ostream &_O, NVPTXAsmPrinter &_AP)
:O(_O),AP(_AP) {
buffer = new unsigned char[_size];
size = _size;
curpos = 0;
numSymbols = 0;
}
~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(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) {
Value *v = Symbols[nSym];
if (GlobalValue *GVar = dyn_cast<GlobalValue>(v)) {
MCSymbol *Name = AP.Mang->getSymbol(GVar);
O << *Name;
}
else if (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;
virtual void emitSrcInText(StringRef filename, unsigned line);
private :
virtual const char *getPassName() const {
return "NVPTX Assembly Printer";
}
const Function *F;
std::string CurrentFnName;
void EmitFunctionEntryLabel();
void EmitFunctionBodyStart();
void EmitFunctionBodyEnd();
void EmitInstruction(const MachineInstr *);
void EmitAlignment(unsigned NumBits, const GlobalValue *GV = 0) const {}
void printGlobalVariable(const GlobalVariable *GVar);
void printOperand(const MachineInstr *MI, int opNum, raw_ostream &O,
const char *Modifier=0);
void printLdStCode(const MachineInstr *MI, int opNum, raw_ostream &O,
const char *Modifier=0);
void printVecModifiedImmediate(const MachineOperand &MO,
const char *Modifier, raw_ostream &O);
void printMemOperand(const MachineInstr *MI, int opNum, raw_ostream &O,
const char *Modifier=0);
void printImplicitDef(const MachineInstr *MI, raw_ostream &O) const;
// definition autogenerated.
void printInstruction(const MachineInstr *MI, raw_ostream &O);
void printModuleLevelGV(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 emitHeader(Module &M, raw_ostream &O);
void emitKernelFunctionDirectives(const Function& F,
raw_ostream &O) const;
void emitVirtualRegister(unsigned int vr, bool isVec, raw_ostream &O);
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);
bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant, const char *ExtraCode,
raw_ostream &);
bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant, const char *ExtraCode,
raw_ostream &);
void printReturnValStr(const Function *, raw_ostream &O);
void printReturnValStr(const MachineFunction &MF, raw_ostream &O);
protected:
bool doInitialization(Module &M);
bool doFinalization(Module &M);
private:
std::string CurrentBankselLabelInBasicBlock;
// This is specific per MachineFunction.
const MachineRegisterInfo *MRI;
// The contents are specific for each
// MachineFunction. But the size of the
// array is not.
std::map<unsigned, unsigned> *VRidGlobal2LocalMap;
// 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<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(Constant *CPV, raw_ostream &O) ;
void printFPConstant(const ConstantFP *Fp, raw_ostream &O) ;
void bufferLEByte(Constant *CPV, int Bytes, AggBuffer *aggBuffer) ;
void bufferAggregateConstant(Constant *CV, AggBuffer *aggBuffer) ;
void printOperandProper(const MachineOperand &MO);
void emitLinkageDirective(const GlobalValue* V, raw_ostream &O);
void emitDeclarations(Module &, raw_ostream &O);
void emitDeclaration(const Function *, raw_ostream &O);
static const char *getRegisterName(unsigned RegNo);
void emitDemotedVars(const Function *, raw_ostream &);
LineReader *reader;
LineReader *getReader(std::string);
public:
NVPTXAsmPrinter(TargetMachine &TM,
MCStreamer &Streamer)
: AsmPrinter(TM, Streamer),
nvptxSubtarget(TM.getSubtarget<NVPTXSubtarget>()) {
CurrentBankselLabelInBasicBlock = "";
VRidGlobal2LocalMap = NULL;
reader = NULL;
}
~NVPTXAsmPrinter() {
if (!reader)
delete reader;
}
bool ignoreLoc(const MachineInstr &);
virtual void getVirtualRegisterName(unsigned, bool, raw_ostream &);
DebugLoc prevDebugLoc;
void emitLineNumberAsDotLoc(const MachineInstr &);
};
} // end of namespace
#endif