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//===- ARCInstPrinter.cpp - ARC MCInst to assembly syntax -------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This class prints an ARC MCInst to a .s file.
//
//===----------------------------------------------------------------------===//
#include "ARCInstPrinter.h"
#include "MCTargetDesc/ARCInfo.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
#define DEBUG_TYPE "asm-printer"
#include "ARCGenAsmWriter.inc"
template <class T>
static const char *BadConditionCode(T cc) {
LLVM_DEBUG(dbgs() << "Unknown condition code passed: " << cc << "\n");
return "{unknown-cc}";
}
static const char *ARCBRCondCodeToString(ARCCC::BRCondCode BRCC) {
switch (BRCC) {
case ARCCC::BREQ:
return "eq";
case ARCCC::BRNE:
return "ne";
case ARCCC::BRLT:
return "lt";
case ARCCC::BRGE:
return "ge";
case ARCCC::BRLO:
return "lo";
case ARCCC::BRHS:
return "hs";
}
return BadConditionCode(BRCC);
}
static const char *ARCCondCodeToString(ARCCC::CondCode CC) {
switch (CC) {
case ARCCC::EQ:
return "eq";
case ARCCC::NE:
return "ne";
case ARCCC::P:
return "p";
case ARCCC::N:
return "n";
case ARCCC::HS:
return "hs";
case ARCCC::LO:
return "lo";
case ARCCC::GT:
return "gt";
case ARCCC::GE:
return "ge";
case ARCCC::VS:
return "vs";
case ARCCC::VC:
return "vc";
case ARCCC::LT:
return "lt";
case ARCCC::LE:
return "le";
case ARCCC::HI:
return "hi";
case ARCCC::LS:
return "ls";
case ARCCC::PNZ:
return "pnz";
case ARCCC::AL:
return "al";
case ARCCC::NZ:
return "nz";
case ARCCC::Z:
return "z";
}
return BadConditionCode(CC);
}
void ARCInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
OS << StringRef(getRegisterName(RegNo)).lower();
}
void ARCInstPrinter::printInst(const MCInst *MI, uint64_t Address,
StringRef Annot, const MCSubtargetInfo &STI,
raw_ostream &O) {
printInstruction(MI, Address, O);
printAnnotation(O, Annot);
}
static void printExpr(const MCExpr *Expr, const MCAsmInfo *MAI,
raw_ostream &OS) {
int Offset = 0;
const MCSymbolRefExpr *SRE;
if (const auto *CE = dyn_cast<MCConstantExpr>(Expr)) {
OS << "0x";
OS.write_hex(CE->getValue());
return;
}
if (const auto *BE = dyn_cast<MCBinaryExpr>(Expr)) {
SRE = dyn_cast<MCSymbolRefExpr>(BE->getLHS());
const auto *CE = dyn_cast<MCConstantExpr>(BE->getRHS());
assert(SRE && CE && "Binary expression must be sym+const.");
Offset = CE->getValue();
} else {
SRE = dyn_cast<MCSymbolRefExpr>(Expr);
assert(SRE && "Unexpected MCExpr type.");
}
assert(SRE->getKind() == MCSymbolRefExpr::VK_None);
// Symbols are prefixed with '@'
OS << '@';
SRE->getSymbol().print(OS, MAI);
if (Offset) {
if (Offset > 0)
OS << '+';
OS << Offset;
}
}
void ARCInstPrinter::printOperand(const MCInst *MI, unsigned OpNum,
raw_ostream &O) {
const MCOperand &Op = MI->getOperand(OpNum);
if (Op.isReg()) {
printRegName(O, Op.getReg());
return;
}
if (Op.isImm()) {
O << Op.getImm();
return;
}
assert(Op.isExpr() && "unknown operand kind in printOperand");
printExpr(Op.getExpr(), &MAI, O);
}
void ARCInstPrinter::printMemOperandRI(const MCInst *MI, unsigned OpNum,
raw_ostream &O) {
const MCOperand &base = MI->getOperand(OpNum);
const MCOperand &offset = MI->getOperand(OpNum + 1);
assert(base.isReg() && "Base should be register.");
assert(offset.isImm() && "Offset should be immediate.");
printRegName(O, base.getReg());
O << "," << offset.getImm();
}
void ARCInstPrinter::printPredicateOperand(const MCInst *MI, unsigned OpNum,
raw_ostream &O) {
const MCOperand &Op = MI->getOperand(OpNum);
assert(Op.isImm() && "Predicate operand is immediate.");
O << ARCCondCodeToString((ARCCC::CondCode)Op.getImm());
}
void ARCInstPrinter::printBRCCPredicateOperand(const MCInst *MI, unsigned OpNum,
raw_ostream &O) {
const MCOperand &Op = MI->getOperand(OpNum);
assert(Op.isImm() && "Predicate operand is immediate.");
O << ARCBRCondCodeToString((ARCCC::BRCondCode)Op.getImm());
}
void ARCInstPrinter::printCCOperand(const MCInst *MI, int OpNum,
raw_ostream &O) {
O << ARCCondCodeToString((ARCCC::CondCode)MI->getOperand(OpNum).getImm());
}
void ARCInstPrinter::printU6ShiftedBy(unsigned ShiftBy, const MCInst *MI,
int OpNum, raw_ostream &O) {
const MCOperand &MO = MI->getOperand(OpNum);
if (MO.isImm()) {
unsigned Value = MO.getImm();
unsigned Value2 = Value >> ShiftBy;
if (Value2 > 0x3F || (Value2 << ShiftBy != Value)) {
errs() << "!!! Instruction has out-of-range U6 immediate operand:\n"
<< " Opcode is " << MI->getOpcode() << "; operand value is "
<< Value;
if (ShiftBy)
errs() << " scaled by " << (1 << ShiftBy) << "\n";
assert(false && "instruction has wrong format");
}
}
printOperand(MI, OpNum, O);
}
void ARCInstPrinter::printU6(const MCInst *MI, int OpNum, raw_ostream &O) {
printU6ShiftedBy(0, MI, OpNum, O);
}
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