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138 lines
4.1 KiB
C++
138 lines
4.1 KiB
C++
//===-- MSP430InstPrinter.cpp - Convert MSP430 MCInst to assembly syntax --===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This class prints an MSP430 MCInst to a .s file.
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//
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//===----------------------------------------------------------------------===//
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#include "MSP430InstPrinter.h"
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#include "MSP430.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCInstrInfo.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/FormattedStream.h"
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using namespace llvm;
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#define DEBUG_TYPE "asm-printer"
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// Include the auto-generated portion of the assembly writer.
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#define PRINT_ALIAS_INSTR
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#include "MSP430GenAsmWriter.inc"
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void MSP430InstPrinter::printInst(const MCInst *MI, raw_ostream &O,
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StringRef Annot, const MCSubtargetInfo &STI) {
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if (!printAliasInstr(MI, O))
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printInstruction(MI, O);
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printAnnotation(O, Annot);
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}
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void MSP430InstPrinter::printPCRelImmOperand(const MCInst *MI, unsigned OpNo,
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raw_ostream &O) {
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const MCOperand &Op = MI->getOperand(OpNo);
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if (Op.isImm()) {
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int64_t Imm = Op.getImm() * 2 + 2;
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O << "$";
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if (Imm >= 0)
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O << '+';
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O << Imm;
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} else {
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assert(Op.isExpr() && "unknown pcrel immediate operand");
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Op.getExpr()->print(O, &MAI);
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}
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}
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void MSP430InstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
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raw_ostream &O, const char *Modifier) {
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assert((Modifier == nullptr || Modifier[0] == 0) && "No modifiers supported");
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const MCOperand &Op = MI->getOperand(OpNo);
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if (Op.isReg()) {
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O << getRegisterName(Op.getReg());
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} else if (Op.isImm()) {
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O << '#' << Op.getImm();
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} else {
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assert(Op.isExpr() && "unknown operand kind in printOperand");
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O << '#';
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Op.getExpr()->print(O, &MAI);
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}
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}
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void MSP430InstPrinter::printSrcMemOperand(const MCInst *MI, unsigned OpNo,
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raw_ostream &O,
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const char *Modifier) {
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const MCOperand &Base = MI->getOperand(OpNo);
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const MCOperand &Disp = MI->getOperand(OpNo+1);
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// Print displacement first
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// If the global address expression is a part of displacement field with a
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// register base, we should not emit any prefix symbol here, e.g.
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// mov.w &foo, r1
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// vs
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// mov.w glb(r1), r2
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// Otherwise (!) msp430-as will silently miscompile the output :(
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if (Base.getReg() == MSP430::SR)
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O << '&';
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if (Disp.isExpr())
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Disp.getExpr()->print(O, &MAI);
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else {
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assert(Disp.isImm() && "Expected immediate in displacement field");
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O << Disp.getImm();
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}
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// Print register base field
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if ((Base.getReg() != MSP430::SR) &&
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(Base.getReg() != MSP430::PC))
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O << '(' << getRegisterName(Base.getReg()) << ')';
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}
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void MSP430InstPrinter::printIndRegOperand(const MCInst *MI, unsigned OpNo,
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raw_ostream &O) {
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const MCOperand &Base = MI->getOperand(OpNo);
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O << "@" << getRegisterName(Base.getReg());
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}
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void MSP430InstPrinter::printPostIndRegOperand(const MCInst *MI, unsigned OpNo,
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raw_ostream &O) {
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const MCOperand &Base = MI->getOperand(OpNo);
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O << "@" << getRegisterName(Base.getReg()) << "+";
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}
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void MSP430InstPrinter::printCCOperand(const MCInst *MI, unsigned OpNo,
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raw_ostream &O) {
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unsigned CC = MI->getOperand(OpNo).getImm();
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switch (CC) {
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default:
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llvm_unreachable("Unsupported CC code");
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case MSP430CC::COND_E:
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O << "eq";
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break;
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case MSP430CC::COND_NE:
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O << "ne";
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break;
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case MSP430CC::COND_HS:
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O << "hs";
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break;
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case MSP430CC::COND_LO:
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O << "lo";
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break;
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case MSP430CC::COND_GE:
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O << "ge";
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break;
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case MSP430CC::COND_L:
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O << 'l';
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break;
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case MSP430CC::COND_N:
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O << 'n';
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break;
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}
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}
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