1 //===-- XCoreInstPrinter.cpp - Convert XCore MCInst to assembly syntax ----===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This class prints an XCore MCInst to a .s file.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #define DEBUG_TYPE "asm-printer"
15 #include "XCoreInstPrinter.h"
16 #include "llvm/ADT/StringExtras.h"
17 #include "llvm/MC/MCExpr.h"
18 #include "llvm/MC/MCInst.h"
19 #include "llvm/MC/MCInstrInfo.h"
20 #include "llvm/MC/MCSymbol.h"
21 #include "llvm/Support/ErrorHandling.h"
22 #include "llvm/Support/raw_ostream.h"
23 using namespace llvm;
24
25 #include "XCoreGenAsmWriter.inc"
26
printRegName(raw_ostream & OS,unsigned RegNo) const27 void XCoreInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
28 OS << StringRef(getRegisterName(RegNo)).lower();
29 }
30
printInst(const MCInst * MI,raw_ostream & O,StringRef Annot)31 void XCoreInstPrinter::printInst(const MCInst *MI, raw_ostream &O,
32 StringRef Annot) {
33 printInstruction(MI, O);
34 printAnnotation(O, Annot);
35 }
36
37 void XCoreInstPrinter::
printInlineJT(const MCInst * MI,int opNum,raw_ostream & O)38 printInlineJT(const MCInst *MI, int opNum, raw_ostream &O) {
39 report_fatal_error("can't handle InlineJT");
40 }
41
42 void XCoreInstPrinter::
printInlineJT32(const MCInst * MI,int opNum,raw_ostream & O)43 printInlineJT32(const MCInst *MI, int opNum, raw_ostream &O) {
44 report_fatal_error("can't handle InlineJT32");
45 }
46
printExpr(const MCExpr * Expr,raw_ostream & OS)47 static void printExpr(const MCExpr *Expr, raw_ostream &OS) {
48 int Offset = 0;
49 const MCSymbolRefExpr *SRE;
50
51 if (const MCBinaryExpr *BE = dyn_cast<MCBinaryExpr>(Expr)) {
52 SRE = dyn_cast<MCSymbolRefExpr>(BE->getLHS());
53 const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(BE->getRHS());
54 assert(SRE && CE && "Binary expression must be sym+const.");
55 Offset = CE->getValue();
56 } else {
57 SRE = dyn_cast<MCSymbolRefExpr>(Expr);
58 assert(SRE && "Unexpected MCExpr type.");
59 }
60 assert(SRE->getKind() == MCSymbolRefExpr::VK_None);
61
62 OS << SRE->getSymbol();
63
64 if (Offset) {
65 if (Offset > 0)
66 OS << '+';
67 OS << Offset;
68 }
69 }
70
71 void XCoreInstPrinter::
printOperand(const MCInst * MI,unsigned OpNo,raw_ostream & O)72 printOperand(const MCInst *MI, unsigned OpNo, raw_ostream &O) {
73 const MCOperand &Op = MI->getOperand(OpNo);
74 if (Op.isReg()) {
75 printRegName(O, Op.getReg());
76 return;
77 }
78
79 if (Op.isImm()) {
80 O << Op.getImm();
81 return;
82 }
83
84 assert(Op.isExpr() && "unknown operand kind in printOperand");
85 printExpr(Op.getExpr(), O);
86 }
87