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//===-- TGSIAsmPrinter.cpp - TGSI 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 GAS-format TGSI assembly language.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "asm-printer"
#include "TGSI.h"
#include "TGSIInstrInfo.h"
#include "TGSITargetMachine.h"
#include "MCTargetDesc/TGSITargetStreamer.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/IR/Mangler.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
namespace {
class TGSIAsmPrinter : public AsmPrinter {
unsigned cpi;
unsigned instructionCount;
public:
explicit TGSIAsmPrinter(TargetMachine &TM,
std::unique_ptr<MCStreamer> Streamer)
: AsmPrinter(TM, std::move(Streamer)), cpi(0),
instructionCount(0) {}
virtual const char *getPassName() const {
return "TGSI Assembly Printer";
}
virtual void EmitInstruction(const MachineInstr *mi);
virtual void EmitFunctionHeader() override;
virtual void EmitFunctionBodyStart();
virtual void EmitFunctionBodyEnd();
virtual void EmitConstantPool() override;
virtual void EmitStartOfAsmFile(Module &) override;
void printOperand(const MachineInstr *MI, int opNum, raw_ostream &OS);
void printInstruction(const MachineInstr *MI, raw_ostream &OS);
static const char *getRegisterName(unsigned RegNo);
private:
void EmitMCInstruction(const MCInst &mci);
void AddFunctionStartAddressMetadata();
};
}
static MCSymbol *
GetSymbolFromOperand(const MachineOperand &mo, AsmPrinter &ap) {
SmallString<128> name;
if (mo.isGlobal()) {
const GlobalValue *gv = mo.getGlobal();
ap.Mang->getNameWithPrefix(name, gv, false);
} else {
assert(mo.isSymbol() && "Isn't a symbol reference");
ap.Mang->getNameWithPrefix(name, mo.getSymbolName(), ap.getDataLayout());
}
return ap.OutContext.getOrCreateSymbol(name);
}
static MCOperand
GetSymbolRef(const MachineOperand &mo, const MCSymbol *sym,
AsmPrinter &printer) {
MCContext &ctx = printer.OutContext;
const MCExpr *Expr = MCSymbolRefExpr::create(sym, MCSymbolRefExpr::VK_None,
ctx);
if (mo.getOffset())
Expr = MCBinaryExpr::createAdd(Expr,
MCConstantExpr::create(mo.getOffset(), ctx),
ctx);
return MCOperand::createExpr(Expr);
}
static void LowerMachineInstrToMCInst(const MachineInstr *mi, MCInst &mci,
AsmPrinter &ap) {
mci.setOpcode(mi->getOpcode());
for (unsigned i = 0; i != mi->getNumOperands(); ++i) {
const MachineOperand &mo = mi->getOperand(i);
MCOperand mco;
switch (mo.getType()) {
case MachineOperand::MO_Register:
mco = MCOperand::createReg(mo.getReg());
break;
case MachineOperand::MO_Immediate:
mco = MCOperand::createImm(mo.getImm());
break;
/* mco = MCOperand::createExpr(MCSymbolRefExpr::create(
ap.GetCPISymbol(mo.getImm()), ap.OutContext));
case MachineOperand::MO_FPImmediate:
mco = MCOperand::createFPImm(mo.getFPImm()->getValueAPF()
.convertToFloat());
break; */
case MachineOperand::MO_MachineBasicBlock:
mco = MCOperand::createExpr(MCSymbolRefExpr::create
(mo.getMBB()->getSymbol(), ap.OutContext));
break;
case MachineOperand::MO_GlobalAddress:
case MachineOperand::MO_ExternalSymbol:
mco = GetSymbolRef(mo, GetSymbolFromOperand(mo, ap), ap);
break;
case MachineOperand::MO_ConstantPoolIndex:
mco = GetSymbolRef(mo, ap.GetCPISymbol(mo.getIndex()), ap);
break;
case MachineOperand::MO_BlockAddress:
mco = GetSymbolRef(mo, ap.GetBlockAddressSymbol(mo.getBlockAddress()),
ap);
break;
default:
assert(0);
break;
}
mci.addOperand(mco);
}
}
void TGSIAsmPrinter::EmitMCInstruction(const MCInst &mci) {
MCTargetStreamer &TS = *OutStreamer->getTargetStreamer();
TGSITargetStreamer &TTS = static_cast<TGSITargetStreamer &>(TS);
TTS.EmitInstructionLabel(instructionCount);
OutStreamer->EmitInstruction(mci, getSubtargetInfo());
instructionCount++;
}
void TGSIAsmPrinter::AddFunctionStartAddressMetadata() {
Function *f = const_cast<Function *>(MF->getFunction());
LLVMContext &ctx = f->getContext();
auto *start = ConstantAsMetadata::get(
ConstantInt::get(Type::getInt32Ty(ctx), instructionCount));
f->addMetadata("tgsi_kernel_start", *MDNode::get(ctx, { start }));
}
void TGSIAsmPrinter::EmitInstruction(const MachineInstr *mi) {
MCInst mci;
LowerMachineInstrToMCInst(mi, mci, *this);
EmitMCInstruction(mci);
}
void TGSIAsmPrinter::EmitStartOfAsmFile(Module &M)
{
MCTargetStreamer &TS = *OutStreamer->getTargetStreamer();
TGSITargetStreamer &TTS = static_cast<TGSITargetStreamer &>(TS);
TTS.EmitStartOfAsmFile();
}
void TGSIAsmPrinter::EmitFunctionHeader() {
EmitConstantPool();
OutStreamer->AddBlankLine();
}
void TGSIAsmPrinter::EmitFunctionBodyStart() {
MCInst mci;
mci.setOpcode(TGSI::BGNSUB);
AddFunctionStartAddressMetadata();
EmitMCInstruction(mci);
}
void TGSIAsmPrinter::EmitFunctionBodyEnd() {
MCInst mci;
mci.setOpcode(TGSI::ENDSUB);
EmitMCInstruction(mci);
}
void TGSIAsmPrinter::EmitConstantPool() {
TGSITargetMachine &TTM = static_cast<TGSITargetMachine &>(TM);
const std::vector<MachineConstantPoolEntry> &CP = TTM.MCP.getConstants();
if (CP.empty()) return;
MCTargetStreamer &TS = *OutStreamer->getTargetStreamer();
TGSITargetStreamer &TTS = static_cast<TGSITargetStreamer &>(TS);
while (cpi < CP.size())
TTS.EmitConstantPoolEntry(CP[cpi++]);
}
extern "C" void LLVMInitializeTGSIAsmPrinter() {
RegisterAsmPrinter<TGSIAsmPrinter> X(TheTGSITarget);
}
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