MSP430InstPrinter.cpp revision 33caa07cc57a6311292f7e89c008c5479bde50ca 
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#define DEBUG_TYPE "asm-printer"
15#include "MSP430.h"
16#include "MSP430InstPrinter.h"
17#include "llvm/MC/MCInst.h"
18#include "llvm/MC/MCAsmInfo.h"
19#include "llvm/MC/MCExpr.h"
20#include "llvm/Support/ErrorHandling.h"
21#include "llvm/Support/FormattedStream.h"
22using namespace llvm;
23
24
25// Include the auto-generated portion of the assembly writer.
26#include "MSP430GenAsmWriter.inc"
27
28void MSP430InstPrinter::printInst(const MCInst *MI, raw_ostream &O) {
29  printInstruction(MI, O);
30}
31
32void MSP430InstPrinter::printPCRelImmOperand(const MCInst *MI, unsigned OpNo,
33                                             raw_ostream &O) {
34  const MCOperand &Op = MI->getOperand(OpNo);
35  if (Op.isImm())
36    O << Op.getImm();
37  else {
38    assert(Op.isExpr() && "unknown pcrel immediate operand");
39    O << *Op.getExpr();
40  }
41}
42
43void MSP430InstPrinter::printOperand(const MCInst *MI, unsigned OpNo,
44                                     raw_ostream &O, const char *Modifier) {
45  assert((Modifier == 0 || Modifier[0] == 0) && "No modifiers supported");
46  const MCOperand &Op = MI->getOperand(OpNo);
47  if (Op.isReg()) {
48    O << getRegisterName(Op.getReg());
49  } else if (Op.isImm()) {
50    O << '#' << Op.getImm();
51  } else {
52    assert(Op.isExpr() && "unknown operand kind in printOperand");
53    O << '#' << *Op.getExpr();
54  }
55}
56
57void MSP430InstPrinter::printSrcMemOperand(const MCInst *MI, unsigned OpNo,
58                                           raw_ostream &O,
59                                           const char *Modifier) {
60  const MCOperand &Base = MI->getOperand(OpNo);
61  const MCOperand &Disp = MI->getOperand(OpNo+1);
62
63  // Print displacement first
64
65  // If the global address expression is a part of displacement field with a
66  // register base, we should not emit any prefix symbol here, e.g.
67  //   mov.w &foo, r1
68  // vs
69  //   mov.w glb(r1), r2
70  // Otherwise (!) msp430-as will silently miscompile the output :(
71  if (!Base.getReg())
72    O << '&';
73
74  if (Disp.isExpr())
75    O << *Disp.getExpr();
76  else {
77    assert(Disp.isImm() && "Expected immediate in displacement field");
78    O << Disp.getImm();
79  }
80
81  // Print register base field
82  if (Base.getReg())
83    O << '(' << getRegisterName(Base.getReg()) << ')';
84}
85
86void MSP430InstPrinter::printCCOperand(const MCInst *MI, unsigned OpNo,
87                                       raw_ostream &O) {
88  unsigned CC = MI->getOperand(OpNo).getImm();
89
90  switch (CC) {
91  default:
92   llvm_unreachable("Unsupported CC code");
93   break;
94  case MSP430CC::COND_E:
95   O << "eq";
96   break;
97  case MSP430CC::COND_NE:
98   O << "ne";
99   break;
100  case MSP430CC::COND_HS:
101   O << "hs";
102   break;
103  case MSP430CC::COND_LO:
104   O << "lo";
105   break;
106  case MSP430CC::COND_GE:
107   O << "ge";
108   break;
109  case MSP430CC::COND_L:
110   O << 'l';
111   break;
112  }
113}
114