llvm-6502/lib/Target/Hexagon/HexagonAsmPrinter.cpp
2015-06-09 00:31:39 +00:00

220 lines
7.5 KiB
C++

//===-- HexagonAsmPrinter.cpp - Print machine instrs to Hexagon assembly --===//
//
// 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 Hexagon assembly language. This printer is
// the output mechanism used by `llc'.
//
//===----------------------------------------------------------------------===//
#include "Hexagon.h"
#include "HexagonAsmPrinter.h"
#include "HexagonMachineFunctionInfo.h"
#include "HexagonSubtarget.h"
#include "HexagonTargetMachine.h"
#include "MCTargetDesc/HexagonInstPrinter.h"
#include "MCTargetDesc/HexagonMCInstrInfo.h"
#include "MCTargetDesc/HexagonMCShuffler.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Analysis/ConstantFolding.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Mangler.h"
#include "llvm/IR/Module.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetRegisterInfo.h"
using namespace llvm;
#define DEBUG_TYPE "asm-printer"
static cl::opt<bool> AlignCalls(
"hexagon-align-calls", cl::Hidden, cl::init(true),
cl::desc("Insert falign after call instruction for Hexagon target"));
HexagonAsmPrinter::HexagonAsmPrinter(TargetMachine &TM,
std::unique_ptr<MCStreamer> Streamer)
: AsmPrinter(TM, std::move(Streamer)), Subtarget(nullptr) {}
void HexagonAsmPrinter::printOperand(const MachineInstr *MI, unsigned OpNo,
raw_ostream &O) {
const MachineOperand &MO = MI->getOperand(OpNo);
switch (MO.getType()) {
default: llvm_unreachable ("<unknown operand type>");
case MachineOperand::MO_Register:
O << HexagonInstPrinter::getRegisterName(MO.getReg());
return;
case MachineOperand::MO_Immediate:
O << MO.getImm();
return;
case MachineOperand::MO_MachineBasicBlock:
MO.getMBB()->getSymbol()->print(O, MAI);
return;
case MachineOperand::MO_ConstantPoolIndex:
GetCPISymbol(MO.getIndex())->print(O, MAI);
return;
case MachineOperand::MO_GlobalAddress:
// Computing the address of a global symbol, not calling it.
getSymbol(MO.getGlobal())->print(O, MAI);
printOffset(MO.getOffset(), O);
return;
}
}
//
// isBlockOnlyReachableByFallthrough - We need to override this since the
// default AsmPrinter does not print labels for any basic block that
// is only reachable by a fall through. That works for all cases except
// for the case in which the basic block is reachable by a fall through but
// through an indirect from a jump table. In this case, the jump table
// will contain a label not defined by AsmPrinter.
//
bool HexagonAsmPrinter::
isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const {
if (MBB->hasAddressTaken()) {
return false;
}
return AsmPrinter::isBlockOnlyReachableByFallthrough(MBB);
}
/// PrintAsmOperand - Print out an operand for an inline asm expression.
///
bool HexagonAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
unsigned AsmVariant,
const char *ExtraCode,
raw_ostream &OS) {
// Does this asm operand have a single letter operand modifier?
if (ExtraCode && ExtraCode[0]) {
if (ExtraCode[1] != 0) return true; // Unknown modifier.
switch (ExtraCode[0]) {
default:
// See if this is a generic print operand
return AsmPrinter::PrintAsmOperand(MI, OpNo, AsmVariant, ExtraCode, OS);
case 'c': // Don't print "$" before a global var name or constant.
// Hexagon never has a prefix.
printOperand(MI, OpNo, OS);
return false;
case 'L': // Write second word of DImode reference.
// Verify that this operand has two consecutive registers.
if (!MI->getOperand(OpNo).isReg() ||
OpNo+1 == MI->getNumOperands() ||
!MI->getOperand(OpNo+1).isReg())
return true;
++OpNo; // Return the high-part.
break;
case 'I':
// Write 'i' if an integer constant, otherwise nothing. Used to print
// addi vs add, etc.
if (MI->getOperand(OpNo).isImm())
OS << "i";
return false;
}
}
printOperand(MI, OpNo, OS);
return false;
}
bool HexagonAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
unsigned OpNo, unsigned AsmVariant,
const char *ExtraCode,
raw_ostream &O) {
if (ExtraCode && ExtraCode[0])
return true; // Unknown modifier.
const MachineOperand &Base = MI->getOperand(OpNo);
const MachineOperand &Offset = MI->getOperand(OpNo+1);
if (Base.isReg())
printOperand(MI, OpNo, O);
else
llvm_unreachable("Unimplemented");
if (Offset.isImm()) {
if (Offset.getImm())
O << " + #" << Offset.getImm();
}
else
llvm_unreachable("Unimplemented");
return false;
}
/// printMachineInstruction -- Print out a single Hexagon MI in Darwin syntax to
/// the current output stream.
///
void HexagonAsmPrinter::EmitInstruction(const MachineInstr *MI) {
MCInst MCB;
MCB.setOpcode(Hexagon::BUNDLE);
MCB.addOperand(MCOperand::createImm(0));
if (MI->isBundle()) {
const MachineBasicBlock* MBB = MI->getParent();
MachineBasicBlock::const_instr_iterator MII = MI;
unsigned IgnoreCount = 0;
for (++MII; MII != MBB->end() && MII->isInsideBundle(); ++MII) {
if (MII->getOpcode() == TargetOpcode::DBG_VALUE ||
MII->getOpcode() == TargetOpcode::IMPLICIT_DEF)
++IgnoreCount;
else {
HexagonLowerToMC(MII, MCB, *this);
}
}
}
else {
HexagonLowerToMC(MI, MCB, *this);
HexagonMCInstrInfo::padEndloop(MCB);
}
// Examine the packet and try to find instructions that can be converted
// to compounds.
HexagonMCInstrInfo::tryCompound(*Subtarget->getInstrInfo(),
OutStreamer->getContext(), MCB);
// Examine the packet and convert pairs of instructions to duplex
// instructions when possible.
SmallVector<DuplexCandidate, 8> possibleDuplexes;
possibleDuplexes = HexagonMCInstrInfo::getDuplexPossibilties(
*Subtarget->getInstrInfo(), MCB);
HexagonMCShuffle(*Subtarget->getInstrInfo(), *Subtarget,
OutStreamer->getContext(), MCB, possibleDuplexes);
EmitToStreamer(*OutStreamer, MCB);
}
extern "C" void LLVMInitializeHexagonAsmPrinter() {
RegisterAsmPrinter<HexagonAsmPrinter> X(TheHexagonTarget);
}