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 
27 void XCoreInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
28   OS << StringRef(getRegisterName(RegNo)).lower();
29 }
30 
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::
38 printInlineJT(const MCInst *MI, int opNum, raw_ostream &O) {
39   report_fatal_error("can't handle InlineJT");
40 }
41 
42 void XCoreInstPrinter::
43 printInlineJT32(const MCInst *MI, int opNum, raw_ostream &O) {
44   report_fatal_error("can't handle InlineJT32");
45 }
46 
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::
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