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//===- HexagonInstPrinter.cpp - Convert Hexagon MCInst to assembly syntax -===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This class prints an Hexagon MCInst to a .s file.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "asm-printer"
#include "Hexagon.h"
#include "HexagonConstExtInfo.h"
#include "HexagonAsmPrinter.h"
#include "HexagonInstPrinter.h"
#include "HexagonMCInst.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/raw_ostream.h"
#include <cstdio>
using namespace llvm;
#define GET_INSTRUCTION_NAME
#include "HexagonGenAsmWriter.inc"
StringRef HexagonInstPrinter::getOpcodeName(unsigned Opcode) const {
return MII.getName(Opcode);
}
StringRef HexagonInstPrinter::getRegName(unsigned RegNo) const {
return getRegisterName(RegNo);
}
void HexagonInstPrinter::printInst(const MCInst *MI, raw_ostream &O,
StringRef Annot) {
printInst((const HexagonMCInst*)(MI), O, Annot);
}
void HexagonInstPrinter::printInst(const HexagonMCInst *MI, raw_ostream &O,
StringRef Annot) {
const char packetPadding[] = " ";
const char startPacket = '{',
endPacket = '}';
// TODO: add outer HW loop when it's supported too.
if (MI->getOpcode() == Hexagon::ENDLOOP0) {
// Ending a harware loop is different from ending an regular packet.
assert(MI->isEndPacket() && "Loop end must also end the packet");
if (MI->isStartPacket()) {
// There must be a packet to end a loop.
// FIXME: when shuffling is always run, this shouldn't be needed.
HexagonMCInst Nop;
StringRef NoAnnot;
Nop.setOpcode (Hexagon::NOP);
Nop.setStartPacket (MI->isStartPacket());
printInst (&Nop, O, NoAnnot);
}
// Close the packet.
if (MI->isEndPacket())
O << packetPadding << endPacket;
printInstruction(MI, O);
}
else {
// Prefix the insn opening the packet.
if (MI->isStartPacket())
O << packetPadding << startPacket << '\n';
printInstruction(MI, O);
// Suffix the insn closing the packet.
if (MI->isEndPacket())
// Suffix the packet in a new line always, since the GNU assembler has
// issues with a closing brace on the same line as CONST{32,64}.
O << '\n' << packetPadding << endPacket;
}
printAnnotation(O, Annot);
}
void HexagonInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
raw_ostream &O) const {
const MCOperand& MO = MI->getOperand(OpNo);
if (MO.isReg()) {
O << getRegisterName(MO.getReg());
} else if(MO.isExpr()) {
O << *MO.getExpr();
} else if(MO.isImm()) {
printImmOperand(MI, OpNo, O);
} else {
llvm_unreachable("Unknown operand");
}
}
void HexagonInstPrinter::printImmOperand(const MCInst *MI, unsigned OpNo,
raw_ostream &O) const {
O << MI->getOperand(OpNo).getImm();
}
void HexagonInstPrinter::printExtOperand(const MCInst *MI, unsigned OpNo,
raw_ostream &O) const {
if (isConstExtended(MI))
O << "#" << MI->getOperand(OpNo).getImm();
else
O << MI->getOperand(OpNo).getImm();
}
void HexagonInstPrinter::printUnsignedImmOperand(const MCInst *MI,
unsigned OpNo, raw_ostream &O) const {
O << MI->getOperand(OpNo).getImm();
}
void HexagonInstPrinter::printNegImmOperand(const MCInst *MI, unsigned OpNo,
raw_ostream &O) const {
O << -MI->getOperand(OpNo).getImm();
}
void HexagonInstPrinter::printNOneImmOperand(const MCInst *MI, unsigned OpNo,
raw_ostream &O) const {
O << -1;
}
void HexagonInstPrinter::printMEMriOperand(const MCInst *MI, unsigned OpNo,
raw_ostream &O) const {
const MCOperand& MO0 = MI->getOperand(OpNo);
const MCOperand& MO1 = MI->getOperand(OpNo + 1);
O << getRegisterName(MO0.getReg());
if (isConstExtended(MI))
O << " + ##" << MO1.getImm();
else
O << " + #" << MO1.getImm();
}
void HexagonInstPrinter::printFrameIndexOperand(const MCInst *MI, unsigned OpNo,
raw_ostream &O) const {
const MCOperand& MO0 = MI->getOperand(OpNo);
const MCOperand& MO1 = MI->getOperand(OpNo + 1);
O << getRegisterName(MO0.getReg()) << ", #" << MO1.getImm();
}
void HexagonInstPrinter::printGlobalOperand(const MCInst *MI, unsigned OpNo,
raw_ostream &O) const {
assert(MI->getOperand(OpNo).isExpr() && "Expecting expression");
printOperand(MI, OpNo, O);
}
void HexagonInstPrinter::printJumpTable(const MCInst *MI, unsigned OpNo,
raw_ostream &O) const {
assert(MI->getOperand(OpNo).isExpr() && "Expecting expression");
printOperand(MI, OpNo, O);
}
void HexagonInstPrinter::printConstantPool(const MCInst *MI, unsigned OpNo,
raw_ostream &O) const {
assert(MI->getOperand(OpNo).isExpr() && "Expecting expression");
printOperand(MI, OpNo, O);
}
void HexagonInstPrinter::printBranchOperand(const MCInst *MI, unsigned OpNo,
raw_ostream &O) const {
// Branches can take an immediate operand. This is used by the branch
// selection pass to print $+8, an eight byte displacement from the PC.
assert("Unknown branch operand.");
}
void HexagonInstPrinter::printCallOperand(const MCInst *MI, unsigned OpNo,
raw_ostream &O) const {
}
void HexagonInstPrinter::printAbsAddrOperand(const MCInst *MI, unsigned OpNo,
raw_ostream &O) const {
}
void HexagonInstPrinter::printPredicateOperand(const MCInst *MI, unsigned OpNo,
raw_ostream &O) const {
}
void HexagonInstPrinter::printSymbol(const MCInst *MI, unsigned OpNo,
raw_ostream &O, bool hi) const {
const MCOperand& MO = MI->getOperand(OpNo);
O << '#' << (hi? "HI": "LO") << '(';
if (MO.isImm()) {
O << '#';
printOperand(MI, OpNo, O);
} else {
assert("Unknown symbol operand");
printOperand(MI, OpNo, O);
}
O << ')';
}
bool HexagonInstPrinter::isConstExtended(const MCInst *MI) const{
unsigned short Opcode = MI->getOpcode();
short ExtOpNum = HexagonConstExt::getCExtOpNum(Opcode);
int MinValue = HexagonConstExt::getMinValue(Opcode);
int MaxValue = HexagonConstExt::getMaxValue(Opcode);
// Instruction has no constant extended operand
if (ExtOpNum == -1)
return false;
int ImmValue = MI->getOperand(ExtOpNum).getImm();
return (ImmValue < MinValue || ImmValue > MaxValue);
}
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