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//===-- X86ATTInstPrinter.cpp - AT&T assembly instruction printing --------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file includes code for rendering MCInst instances as AT&T-style
// assembly.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "asm-printer"
#include "X86ATTInstPrinter.h"
#include "X86InstComments.h"
#include "MCTargetDesc/X86MCTargetDesc.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/FormattedStream.h"
#include <map>
using namespace llvm;
// Include the auto-generated portion of the assembly writer.
#define PRINT_ALIAS_INSTR
#include "X86GenAsmWriter.inc"
void X86ATTInstPrinter::printRegName(raw_ostream &OS,
unsigned RegNo) const {
OS << '%' << getRegisterName(RegNo);
}
void X86ATTInstPrinter::printInst(const MCInst *MI, raw_ostream &OS,
StringRef Annot) {
// Try to print any aliases first.
if (!printAliasInstr(MI, OS))
printInstruction(MI, OS);
// Next always print the annotation.
printAnnotation(OS, Annot);
// If verbose assembly is enabled, we can print some informative comments.
if (CommentStream)
EmitAnyX86InstComments(MI, *CommentStream, getRegisterName);
}
void X86ATTInstPrinter::printSSECC(const MCInst *MI, unsigned Op,
raw_ostream &O) {
switch (MI->getOperand(Op).getImm()) {
default: llvm_unreachable("Invalid ssecc argument!");
case 0: O << "eq"; break;
case 1: O << "lt"; break;
case 2: O << "le"; break;
case 3: O << "unord"; break;
case 4: O << "neq"; break;
case 5: O << "nlt"; break;
case 6: O << "nle"; break;
case 7: O << "ord"; break;
case 8: O << "eq_uq"; break;
case 9: O << "nge"; break;
case 0xa: O << "ngt"; break;
case 0xb: O << "false"; break;
case 0xc: O << "neq_oq"; break;
case 0xd: O << "ge"; break;
case 0xe: O << "gt"; break;
case 0xf: O << "true"; break;
case 0x10: O << "eq_os"; break;
case 0x11: O << "lt_oq"; break;
case 0x12: O << "le_oq"; break;
case 0x13: O << "unord_s"; break;
case 0x14: O << "neq_us"; break;
case 0x15: O << "nlt_uq"; break;
case 0x16: O << "nle_uq"; break;
case 0x17: O << "ord_s"; break;
case 0x18: O << "eq_us"; break;
case 0x19: O << "nge_uq"; break;
case 0x1a: O << "ngt_uq"; break;
case 0x1b: O << "false_os"; break;
case 0x1c: O << "neq_os"; break;
case 0x1d: O << "ge_oq"; break;
case 0x1e: O << "gt_oq"; break;
case 0x1f: O << "true_us"; break;
}
}
/// print_pcrel_imm - This is used to print an immediate value that ends up
/// being encoded as a pc-relative value (e.g. for jumps and calls). These
/// print slightly differently than normal immediates. For example, a $ is not
/// emitted.
void X86ATTInstPrinter::print_pcrel_imm(const MCInst *MI, unsigned OpNo,
raw_ostream &O) {
const MCOperand &Op = MI->getOperand(OpNo);
if (Op.isImm())
O << Op.getImm();
else {
assert(Op.isExpr() && "unknown pcrel immediate operand");
// If a symbolic branch target was added as a constant expression then print
// that address in hex.
const MCConstantExpr *BranchTarget = dyn_cast<MCConstantExpr>(Op.getExpr());
int64_t Address;
if (BranchTarget && BranchTarget->EvaluateAsAbsolute(Address)) {
O << "0x";
O.write_hex(Address);
}
else {
// Otherwise, just print the expression.
O << *Op.getExpr();
}
}
}
void X86ATTInstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
raw_ostream &O) {
const MCOperand &Op = MI->getOperand(OpNo);
if (Op.isReg()) {
O << '%' << getRegisterName(Op.getReg());
} else if (Op.isImm()) {
// Print X86 immediates as signed values.
O << '$' << (int64_t)Op.getImm();
if (CommentStream && (Op.getImm() > 255 || Op.getImm() < -256))
*CommentStream << format("imm = 0x%" PRIX64 "\n", (uint64_t)Op.getImm());
} else {
assert(Op.isExpr() && "unknown operand kind in printOperand");
O << '$' << *Op.getExpr();
}
}
void X86ATTInstPrinter::printMemReference(const MCInst *MI, unsigned Op,
raw_ostream &O) {
const MCOperand &BaseReg = MI->getOperand(Op);
const MCOperand &IndexReg = MI->getOperand(Op+2);
const MCOperand &DispSpec = MI->getOperand(Op+3);
const MCOperand &SegReg = MI->getOperand(Op+4);
// If this has a segment register, print it.
if (SegReg.getReg()) {
printOperand(MI, Op+4, O);
O << ':';
}
if (DispSpec.isImm()) {
int64_t DispVal = DispSpec.getImm();
if (DispVal || (!IndexReg.getReg() && !BaseReg.getReg()))
O << DispVal;
} else {
assert(DispSpec.isExpr() && "non-immediate displacement for LEA?");
O << *DispSpec.getExpr();
}
if (IndexReg.getReg() || BaseReg.getReg()) {
O << '(';
if (BaseReg.getReg())
printOperand(MI, Op, O);
if (IndexReg.getReg()) {
O << ',';
printOperand(MI, Op+2, O);
unsigned ScaleVal = MI->getOperand(Op+1).getImm();
if (ScaleVal != 1)
O << ',' << ScaleVal;
}
O << ')';
}
}
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