1 //===-- MSP430InstPrinter.cpp - Convert MSP430 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 MSP430 MCInst to a .s file.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "MSP430InstPrinter.h"
15 #include "MSP430.h"
16 #include "llvm/MC/MCAsmInfo.h"
17 #include "llvm/MC/MCExpr.h"
18 #include "llvm/MC/MCInst.h"
19 #include "llvm/Support/ErrorHandling.h"
20 #include "llvm/Support/FormattedStream.h"
21 using namespace llvm;
22
23 #define DEBUG_TYPE "asm-printer"
24
25
26 // Include the auto-generated portion of the assembly writer.
27 #include "MSP430GenAsmWriter.inc"
28
printInst(const MCInst * MI,raw_ostream & O,StringRef Annot)29 void MSP430InstPrinter::printInst(const MCInst *MI, raw_ostream &O,
30 StringRef Annot) {
31 printInstruction(MI, O);
32 printAnnotation(O, Annot);
33 }
34
printPCRelImmOperand(const MCInst * MI,unsigned OpNo,raw_ostream & O)35 void MSP430InstPrinter::printPCRelImmOperand(const MCInst *MI, unsigned OpNo,
36 raw_ostream &O) {
37 const MCOperand &Op = MI->getOperand(OpNo);
38 if (Op.isImm())
39 O << Op.getImm();
40 else {
41 assert(Op.isExpr() && "unknown pcrel immediate operand");
42 O << *Op.getExpr();
43 }
44 }
45
printOperand(const MCInst * MI,unsigned OpNo,raw_ostream & O,const char * Modifier)46 void MSP430InstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
47 raw_ostream &O, const char *Modifier) {
48 assert((Modifier == nullptr || Modifier[0] == 0) && "No modifiers supported");
49 const MCOperand &Op = MI->getOperand(OpNo);
50 if (Op.isReg()) {
51 O << getRegisterName(Op.getReg());
52 } else if (Op.isImm()) {
53 O << '#' << Op.getImm();
54 } else {
55 assert(Op.isExpr() && "unknown operand kind in printOperand");
56 O << '#' << *Op.getExpr();
57 }
58 }
59
printSrcMemOperand(const MCInst * MI,unsigned OpNo,raw_ostream & O,const char * Modifier)60 void MSP430InstPrinter::printSrcMemOperand(const MCInst *MI, unsigned OpNo,
61 raw_ostream &O,
62 const char *Modifier) {
63 const MCOperand &Base = MI->getOperand(OpNo);
64 const MCOperand &Disp = MI->getOperand(OpNo+1);
65
66 // Print displacement first
67
68 // If the global address expression is a part of displacement field with a
69 // register base, we should not emit any prefix symbol here, e.g.
70 // mov.w &foo, r1
71 // vs
72 // mov.w glb(r1), r2
73 // Otherwise (!) msp430-as will silently miscompile the output :(
74 if (!Base.getReg())
75 O << '&';
76
77 if (Disp.isExpr())
78 O << *Disp.getExpr();
79 else {
80 assert(Disp.isImm() && "Expected immediate in displacement field");
81 O << Disp.getImm();
82 }
83
84 // Print register base field
85 if (Base.getReg())
86 O << '(' << getRegisterName(Base.getReg()) << ')';
87 }
88
printCCOperand(const MCInst * MI,unsigned OpNo,raw_ostream & O)89 void MSP430InstPrinter::printCCOperand(const MCInst *MI, unsigned OpNo,
90 raw_ostream &O) {
91 unsigned CC = MI->getOperand(OpNo).getImm();
92
93 switch (CC) {
94 default:
95 llvm_unreachable("Unsupported CC code");
96 case MSP430CC::COND_E:
97 O << "eq";
98 break;
99 case MSP430CC::COND_NE:
100 O << "ne";
101 break;
102 case MSP430CC::COND_HS:
103 O << "hs";
104 break;
105 case MSP430CC::COND_LO:
106 O << "lo";
107 break;
108 case MSP430CC::COND_GE:
109 O << "ge";
110 break;
111 case MSP430CC::COND_L:
112 O << 'l';
113 break;
114 }
115 }
116