1 //===-- XCoreInstPrinter.cpp - Convert XCore MCInst to assembly syntax ----===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This class prints an XCore MCInst to a .s file.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "XCoreInstPrinter.h"
14 #include "llvm/ADT/StringRef.h"
15 #include "llvm/MC/MCExpr.h"
16 #include "llvm/MC/MCInst.h"
17 #include "llvm/MC/MCSymbol.h"
18 #include "llvm/Support/Casting.h"
19 #include "llvm/Support/ErrorHandling.h"
20 #include "llvm/Support/raw_ostream.h"
21 #include <cassert>
22 
23 using namespace llvm;
24 
25 #define DEBUG_TYPE "asm-printer"
26 
27 #include "XCoreGenAsmWriter.inc"
28 
29 void XCoreInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
30   OS << StringRef(getRegisterName(RegNo)).lower();
31 }
32 
33 void XCoreInstPrinter::printInst(const MCInst *MI, raw_ostream &O,
34                                  StringRef Annot, const MCSubtargetInfo &STI) {
35   printInstruction(MI, O);
36   printAnnotation(O, Annot);
37 }
38 
39 void XCoreInstPrinter::
40 printInlineJT(const MCInst *MI, int opNum, raw_ostream &O) {
41   report_fatal_error("can't handle InlineJT");
42 }
43 
44 void XCoreInstPrinter::
45 printInlineJT32(const MCInst *MI, int opNum, raw_ostream &O) {
46   report_fatal_error("can't handle InlineJT32");
47 }
48 
49 static void printExpr(const MCExpr *Expr, const MCAsmInfo *MAI,
50                       raw_ostream &OS) {
51   int Offset = 0;
52   const MCSymbolRefExpr *SRE;
53 
54   if (const MCBinaryExpr *BE = dyn_cast<MCBinaryExpr>(Expr)) {
55     SRE = dyn_cast<MCSymbolRefExpr>(BE->getLHS());
56     const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(BE->getRHS());
57     assert(SRE && CE && "Binary expression must be sym+const.");
58     Offset = CE->getValue();
59   } else {
60     SRE = dyn_cast<MCSymbolRefExpr>(Expr);
61     assert(SRE && "Unexpected MCExpr type.");
62   }
63   assert(SRE->getKind() == MCSymbolRefExpr::VK_None);
64 
65   SRE->getSymbol().print(OS, MAI);
66 
67   if (Offset) {
68     if (Offset > 0)
69       OS << '+';
70     OS << Offset;
71   }
72 }
73 
74 void XCoreInstPrinter::
75 printOperand(const MCInst *MI, unsigned OpNo, raw_ostream &O) {
76   const MCOperand &Op = MI->getOperand(OpNo);
77   if (Op.isReg()) {
78     printRegName(O, Op.getReg());
79     return;
80   }
81 
82   if (Op.isImm()) {
83     O << Op.getImm();
84     return;
85   }
86 
87   assert(Op.isExpr() && "unknown operand kind in printOperand");
88   printExpr(Op.getExpr(), &MAI, O);
89 }
90