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//===-- LanaiInstPrinter.cpp - Convert Lanai MCInst to asm syntax ---------===//
//
// 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 Lanai MCInst to a .s file.
//
//===----------------------------------------------------------------------===//
#include "LanaiInstPrinter.h"
#include "LanaiMCExpr.h"
#include "LanaiAluCode.h"
#include "LanaiCondCode.h"
#include "MCTargetDesc/LanaiMCTargetDesc.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/FormattedStream.h"
using namespace llvm;
#define DEBUG_TYPE "asm-printer"
// Include the auto-generated portion of the assembly writer.
#define PRINT_ALIAS_INSTR
#include "LanaiGenAsmWriter.inc"
void LanaiInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
OS << StringRef(getRegisterName(RegNo)).lower();
}
bool LanaiInstPrinter::printInst(const MCInst *MI, raw_ostream &OS,
StringRef Alias, unsigned OpNo0,
unsigned OpNo1) {
OS << "\t" << Alias << " ";
printOperand(MI, OpNo0, OS);
OS << ", ";
printOperand(MI, OpNo1, OS);
return true;
}
static bool usesGivenOffset(const MCInst *MI, int AddOffset) {
unsigned AluCode = MI->getOperand(3).getImm();
return LPAC::encodeLanaiAluCode(AluCode) == LPAC::ADD &&
(MI->getOperand(2).getImm() == AddOffset ||
MI->getOperand(2).getImm() == -AddOffset);
}
static bool isPreIncrementForm(const MCInst *MI, int AddOffset) {
unsigned AluCode = MI->getOperand(3).getImm();
return LPAC::isPreOp(AluCode) && usesGivenOffset(MI, AddOffset);
}
static bool isPostIncrementForm(const MCInst *MI, int AddOffset) {
unsigned AluCode = MI->getOperand(3).getImm();
return LPAC::isPostOp(AluCode) && usesGivenOffset(MI, AddOffset);
}
static StringRef decIncOperator(const MCInst *MI) {
if (MI->getOperand(2).getImm() < 0)
return "--";
return "++";
}
bool LanaiInstPrinter::printMemoryLoadIncrement(const MCInst *MI,
raw_ostream &OS,
StringRef Opcode,
int AddOffset) {
if (isPreIncrementForm(MI, AddOffset)) {
OS << "\t" << Opcode << "\t[" << decIncOperator(MI) << "%"
<< getRegisterName(MI->getOperand(1).getReg()) << "], %"
<< getRegisterName(MI->getOperand(0).getReg());
return true;
}
if (isPostIncrementForm(MI, AddOffset)) {
OS << "\t" << Opcode << "\t[%"
<< getRegisterName(MI->getOperand(1).getReg()) << decIncOperator(MI)
<< "], %" << getRegisterName(MI->getOperand(0).getReg());
return true;
}
return false;
}
bool LanaiInstPrinter::printMemoryStoreIncrement(const MCInst *MI,
raw_ostream &OS,
StringRef Opcode,
int AddOffset) {
if (isPreIncrementForm(MI, AddOffset)) {
OS << "\t" << Opcode << "\t%" << getRegisterName(MI->getOperand(0).getReg())
<< ", [" << decIncOperator(MI) << "%"
<< getRegisterName(MI->getOperand(1).getReg()) << "]";
return true;
}
if (isPostIncrementForm(MI, AddOffset)) {
OS << "\t" << Opcode << "\t%" << getRegisterName(MI->getOperand(0).getReg())
<< ", [%" << getRegisterName(MI->getOperand(1).getReg())
<< decIncOperator(MI) << "]";
return true;
}
return false;
}
bool LanaiInstPrinter::printAlias(const MCInst *MI, raw_ostream &OS) {
switch (MI->getOpcode()) {
case Lanai::LDW_RI:
// ld 4[*%rN], %rX => ld [++imm], %rX
// ld -4[*%rN], %rX => ld [--imm], %rX
// ld 4[%rN*], %rX => ld [imm++], %rX
// ld -4[%rN*], %rX => ld [imm--], %rX
return printMemoryLoadIncrement(MI, OS, "ld", 4);
case Lanai::LDHs_RI:
return printMemoryLoadIncrement(MI, OS, "ld.h", 2);
case Lanai::LDHz_RI:
return printMemoryLoadIncrement(MI, OS, "uld.h", 2);
case Lanai::LDBs_RI:
return printMemoryLoadIncrement(MI, OS, "ld.b", 1);
case Lanai::LDBz_RI:
return printMemoryLoadIncrement(MI, OS, "uld.b", 1);
case Lanai::SW_RI:
// st %rX, 4[*%rN] => st %rX, [++imm]
// st %rX, -4[*%rN] => st %rX, [--imm]
// st %rX, 4[%rN*] => st %rX, [imm++]
// st %rX, -4[%rN*] => st %rX, [imm--]
return printMemoryStoreIncrement(MI, OS, "st", 4);
case Lanai::STH_RI:
return printMemoryStoreIncrement(MI, OS, "st.h", 2);
case Lanai::STB_RI:
return printMemoryStoreIncrement(MI, OS, "st.b", 1);
default:
return false;
}
}
void LanaiInstPrinter::printInst(const MCInst *MI, uint64_t Address,
StringRef Annotation,
const MCSubtargetInfo & /*STI*/,
raw_ostream &OS) {
if (!printAlias(MI, OS) && !printAliasInstr(MI, Address, OS))
printInstruction(MI, Address, OS);
printAnnotation(OS, Annotation);
}
void LanaiInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
raw_ostream &OS, const char *Modifier) {
assert((Modifier == nullptr || Modifier[0] == 0) && "No modifiers supported");
const MCOperand &Op = MI->getOperand(OpNo);
if (Op.isReg())
OS << "%" << getRegisterName(Op.getReg());
else if (Op.isImm())
OS << formatHex(Op.getImm());
else {
assert(Op.isExpr() && "Expected an expression");
Op.getExpr()->print(OS, &MAI);
}
}
void LanaiInstPrinter::printMemImmOperand(const MCInst *MI, unsigned OpNo,
raw_ostream &OS) {
const MCOperand &Op = MI->getOperand(OpNo);
if (Op.isImm()) {
OS << '[' << formatHex(Op.getImm()) << ']';
} else {
// Symbolic operand will be lowered to immediate value by linker
assert(Op.isExpr() && "Expected an expression");
OS << '[';
Op.getExpr()->print(OS, &MAI);
OS << ']';
}
}
void LanaiInstPrinter::printHi16ImmOperand(const MCInst *MI, unsigned OpNo,
raw_ostream &OS) {
const MCOperand &Op = MI->getOperand(OpNo);
if (Op.isImm()) {
OS << formatHex(Op.getImm() << 16);
} else {
// Symbolic operand will be lowered to immediate value by linker
assert(Op.isExpr() && "Expected an expression");
Op.getExpr()->print(OS, &MAI);
}
}
void LanaiInstPrinter::printHi16AndImmOperand(const MCInst *MI, unsigned OpNo,
raw_ostream &OS) {
const MCOperand &Op = MI->getOperand(OpNo);
if (Op.isImm()) {
OS << formatHex((Op.getImm() << 16) | 0xffff);
} else {
// Symbolic operand will be lowered to immediate value by linker
assert(Op.isExpr() && "Expected an expression");
Op.getExpr()->print(OS, &MAI);
}
}
void LanaiInstPrinter::printLo16AndImmOperand(const MCInst *MI, unsigned OpNo,
raw_ostream &OS) {
const MCOperand &Op = MI->getOperand(OpNo);
if (Op.isImm()) {
OS << formatHex(0xffff0000 | Op.getImm());
} else {
// Symbolic operand will be lowered to immediate value by linker
assert(Op.isExpr() && "Expected an expression");
Op.getExpr()->print(OS, &MAI);
}
}
static void printMemoryBaseRegister(raw_ostream &OS, const unsigned AluCode,
const MCOperand &RegOp) {
assert(RegOp.isReg() && "Register operand expected");
OS << "[";
if (LPAC::isPreOp(AluCode))
OS << "*";
OS << "%" << LanaiInstPrinter::getRegisterName(RegOp.getReg());
if (LPAC::isPostOp(AluCode))
OS << "*";
OS << "]";
}
template <unsigned SizeInBits>
static void printMemoryImmediateOffset(const MCAsmInfo &MAI,
const MCOperand &OffsetOp,
raw_ostream &OS) {
assert((OffsetOp.isImm() || OffsetOp.isExpr()) && "Immediate expected");
if (OffsetOp.isImm()) {
assert(isInt<SizeInBits>(OffsetOp.getImm()) && "Constant value truncated");
OS << OffsetOp.getImm();
} else
OffsetOp.getExpr()->print(OS, &MAI);
}
void LanaiInstPrinter::printMemRiOperand(const MCInst *MI, int OpNo,
raw_ostream &OS,
const char * /*Modifier*/) {
const MCOperand &RegOp = MI->getOperand(OpNo);
const MCOperand &OffsetOp = MI->getOperand(OpNo + 1);
const MCOperand &AluOp = MI->getOperand(OpNo + 2);
const unsigned AluCode = AluOp.getImm();
// Offset
printMemoryImmediateOffset<16>(MAI, OffsetOp, OS);
// Register
printMemoryBaseRegister(OS, AluCode, RegOp);
}
void LanaiInstPrinter::printMemRrOperand(const MCInst *MI, int OpNo,
raw_ostream &OS,
const char * /*Modifier*/) {
const MCOperand &RegOp = MI->getOperand(OpNo);
const MCOperand &OffsetOp = MI->getOperand(OpNo + 1);
const MCOperand &AluOp = MI->getOperand(OpNo + 2);
const unsigned AluCode = AluOp.getImm();
assert(OffsetOp.isReg() && RegOp.isReg() && "Registers expected.");
// [ Base OP Offset ]
OS << "[";
if (LPAC::isPreOp(AluCode))
OS << "*";
OS << "%" << getRegisterName(RegOp.getReg());
if (LPAC::isPostOp(AluCode))
OS << "*";
OS << " " << LPAC::lanaiAluCodeToString(AluCode) << " ";
OS << "%" << getRegisterName(OffsetOp.getReg());
OS << "]";
}
void LanaiInstPrinter::printMemSplsOperand(const MCInst *MI, int OpNo,
raw_ostream &OS,
const char * /*Modifier*/) {
const MCOperand &RegOp = MI->getOperand(OpNo);
const MCOperand &OffsetOp = MI->getOperand(OpNo + 1);
const MCOperand &AluOp = MI->getOperand(OpNo + 2);
const unsigned AluCode = AluOp.getImm();
// Offset
printMemoryImmediateOffset<10>(MAI, OffsetOp, OS);
// Register
printMemoryBaseRegister(OS, AluCode, RegOp);
}
void LanaiInstPrinter::printCCOperand(const MCInst *MI, int OpNo,
raw_ostream &OS) {
LPCC::CondCode CC =
static_cast<LPCC::CondCode>(MI->getOperand(OpNo).getImm());
// Handle the undefined value here for printing so we don't abort().
if (CC >= LPCC::UNKNOWN)
OS << "<und>";
else
OS << lanaiCondCodeToString(CC);
}
void LanaiInstPrinter::printPredicateOperand(const MCInst *MI, unsigned OpNo,
raw_ostream &OS) {
LPCC::CondCode CC =
static_cast<LPCC::CondCode>(MI->getOperand(OpNo).getImm());
// Handle the undefined value here for printing so we don't abort().
if (CC >= LPCC::UNKNOWN)
OS << "<und>";
else if (CC != LPCC::ICC_T)
OS << "." << lanaiCondCodeToString(CC);
}
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