141 lines
4.3 KiB
C++
141 lines
4.3 KiB
C++
//===-- X86ATTInstPrinter.cpp - AT&T assembly instruction printing --------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file includes code for rendering MCInst instances as AT&T-style
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// assembly.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "asm-printer"
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#include "X86ATTInstPrinter.h"
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#include "X86InstComments.h"
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#include "MCTargetDesc/X86MCTargetDesc.h"
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#include "llvm/MC/MCInst.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/Support/ErrorHandling.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/FormattedStream.h"
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#include <map>
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using namespace llvm;
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// Include the auto-generated portion of the assembly writer.
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#define GET_INSTRUCTION_NAME
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#define PRINT_ALIAS_INSTR
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#include "X86GenAsmWriter.inc"
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X86ATTInstPrinter::X86ATTInstPrinter(const MCAsmInfo &MAI)
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: MCInstPrinter(MAI) {
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}
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void X86ATTInstPrinter::printRegName(raw_ostream &OS,
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unsigned RegNo) const {
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OS << '%' << getRegisterName(RegNo);
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}
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void X86ATTInstPrinter::printInst(const MCInst *MI, raw_ostream &OS) {
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// Try to print any aliases first.
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if (!printAliasInstr(MI, OS))
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printInstruction(MI, OS);
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// If verbose assembly is enabled, we can print some informative comments.
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if (CommentStream)
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EmitAnyX86InstComments(MI, *CommentStream, getRegisterName);
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}
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StringRef X86ATTInstPrinter::getOpcodeName(unsigned Opcode) const {
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return getInstructionName(Opcode);
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}
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void X86ATTInstPrinter::printSSECC(const MCInst *MI, unsigned Op,
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raw_ostream &O) {
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switch (MI->getOperand(Op).getImm()) {
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default: assert(0 && "Invalid ssecc argument!");
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case 0: O << "eq"; break;
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case 1: O << "lt"; break;
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case 2: O << "le"; break;
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case 3: O << "unord"; break;
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case 4: O << "neq"; break;
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case 5: O << "nlt"; break;
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case 6: O << "nle"; break;
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case 7: O << "ord"; break;
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}
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}
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/// print_pcrel_imm - This is used to print an immediate value that ends up
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/// being encoded as a pc-relative value (e.g. for jumps and calls). These
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/// print slightly differently than normal immediates. For example, a $ is not
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/// emitted.
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void X86ATTInstPrinter::print_pcrel_imm(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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// Print this as a signed 32-bit value.
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O << (int)Op.getImm();
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else {
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assert(Op.isExpr() && "unknown pcrel immediate operand");
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O << *Op.getExpr();
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}
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}
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void X86ATTInstPrinter::printOperand(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.isReg()) {
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O << '%' << getRegisterName(Op.getReg());
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} else if (Op.isImm()) {
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O << '$' << Op.getImm();
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if (CommentStream && (Op.getImm() > 255 || Op.getImm() < -256))
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*CommentStream << format("imm = 0x%llX\n", (long long)Op.getImm());
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} else {
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assert(Op.isExpr() && "unknown operand kind in printOperand");
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O << '$' << *Op.getExpr();
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}
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}
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void X86ATTInstPrinter::printMemReference(const MCInst *MI, unsigned Op,
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raw_ostream &O) {
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const MCOperand &BaseReg = MI->getOperand(Op);
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const MCOperand &IndexReg = MI->getOperand(Op+2);
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const MCOperand &DispSpec = MI->getOperand(Op+3);
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const MCOperand &SegReg = MI->getOperand(Op+4);
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// If this has a segment register, print it.
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if (SegReg.getReg()) {
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printOperand(MI, Op+4, O);
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O << ':';
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}
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if (DispSpec.isImm()) {
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int64_t DispVal = DispSpec.getImm();
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if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg()))
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O << DispVal;
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} else {
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assert(DispSpec.isExpr() && "non-immediate displacement for LEA?");
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O << *DispSpec.getExpr();
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}
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if (IndexReg.getReg() || BaseReg.getReg()) {
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O << '(';
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if (BaseReg.getReg())
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printOperand(MI, Op, O);
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if (IndexReg.getReg()) {
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O << ',';
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printOperand(MI, Op+2, O);
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unsigned ScaleVal = MI->getOperand(Op+1).getImm();
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if (ScaleVal != 1)
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O << ',' << ScaleVal;
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}
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O << ')';
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}
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}
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