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, uint64_t Address,
34                                  StringRef Annot, const MCSubtargetInfo &STI,
35                                  raw_ostream &O) {
36   printInstruction(MI, Address, O);
37   printAnnotation(O, Annot);
38 }
39 
40 void XCoreInstPrinter::
41 printInlineJT(const MCInst *MI, int opNum, raw_ostream &O) {
42   report_fatal_error("can't handle InlineJT");
43 }
44 
45 void XCoreInstPrinter::
46 printInlineJT32(const MCInst *MI, int opNum, raw_ostream &O) {
47   report_fatal_error("can't handle InlineJT32");
48 }
49 
50 static void printExpr(const MCExpr *Expr, const MCAsmInfo *MAI,
51                       raw_ostream &OS) {
52   int Offset = 0;
53   const MCSymbolRefExpr *SRE;
54 
55   if (const MCBinaryExpr *BE = dyn_cast<MCBinaryExpr>(Expr)) {
56     SRE = dyn_cast<MCSymbolRefExpr>(BE->getLHS());
57     const MCConstantExpr *CE = dyn_cast<MCConstantExpr>(BE->getRHS());
58     assert(SRE && CE && "Binary expression must be sym+const.");
59     Offset = CE->getValue();
60   } else {
61     SRE = dyn_cast<MCSymbolRefExpr>(Expr);
62     assert(SRE && "Unexpected MCExpr type.");
63   }
64   assert(SRE->getKind() == MCSymbolRefExpr::VK_None);
65 
66   SRE->getSymbol().print(OS, MAI);
67 
68   if (Offset) {
69     if (Offset > 0)
70       OS << '+';
71     OS << Offset;
72   }
73 }
74 
75 void XCoreInstPrinter::
76 printOperand(const MCInst *MI, unsigned OpNo, raw_ostream &O) {
77   const MCOperand &Op = MI->getOperand(OpNo);
78   if (Op.isReg()) {
79     printRegName(O, Op.getReg());
80     return;
81   }
82 
83   if (Op.isImm()) {
84     O << Op.getImm();
85     return;
86   }
87 
88   assert(Op.isExpr() && "unknown operand kind in printOperand");
89   printExpr(Op.getExpr(), &MAI, O);
90 }
91