MSP430AsmPrinter.cpp revision 8b528e52ee6018b0d0e7e46b3b4cf6f41fdaa0d9 
1//===-- MSP430AsmPrinter.cpp - MSP430 LLVM assembly writer ------------------===//
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 file contains a printer that converts from our internal representation
11// of machine-dependent LLVM code to the MSP430 assembly language.
12//
13//===----------------------------------------------------------------------===//
14
15#define DEBUG_TYPE "asm-printer"
16#include "MSP430.h"
17#include "MSP430InstrInfo.h"
18#include "MSP430TargetMachine.h"
19#include "llvm/Constants.h"
20#include "llvm/DerivedTypes.h"
21#include "llvm/Module.h"
22#include "llvm/CodeGen/AsmPrinter.h"
23#include "llvm/CodeGen/DwarfWriter.h"
24#include "llvm/CodeGen/MachineModuleInfo.h"
25#include "llvm/CodeGen/MachineFunctionPass.h"
26#include "llvm/CodeGen/MachineConstantPool.h"
27#include "llvm/CodeGen/MachineInstr.h"
28#include "llvm/Target/TargetAsmInfo.h"
29#include "llvm/Target/TargetData.h"
30#include "llvm/ADT/Statistic.h"
31#include "llvm/Support/Compiler.h"
32#include "llvm/Support/Mangler.h"
33#include "llvm/Support/raw_ostream.h"
34
35using namespace llvm;
36
37STATISTIC(EmittedInsts, "Number of machine instrs printed");
38
39namespace {
40  class VISIBILITY_HIDDEN MSP430AsmPrinter : public AsmPrinter {
41  public:
42    MSP430AsmPrinter(raw_ostream &O, MSP430TargetMachine &TM,
43                    const TargetAsmInfo *TAI, bool Fast, bool Verbose)
44      : AsmPrinter(O, TM, TAI, Fast, Verbose) {}
45
46    virtual const char *getPassName() const {
47      return "MSP430 Assembly Printer";
48    }
49
50    void printOperand(const MachineInstr *MI, int OpNum,
51                      const char* Modifier = 0);
52    void printSrcMemOperand(const MachineInstr *MI, int OpNum,
53                            const char* Modifier = 0);
54    void printCCOperand(const MachineInstr *MI, int OpNum);
55    bool printInstruction(const MachineInstr *MI);  // autogenerated.
56    void printMachineInstruction(const MachineInstr * MI);
57    bool runOnMachineFunction(MachineFunction &F);
58    bool doInitialization(Module &M);
59    bool doFinalization(Module &M);
60
61    void getAnalysisUsage(AnalysisUsage &AU) const {
62      AsmPrinter::getAnalysisUsage(AU);
63      AU.setPreservesAll();
64    }
65  };
66} // end of anonymous namespace
67
68#include "MSP430GenAsmWriter.inc"
69
70/// createMSP430CodePrinterPass - Returns a pass that prints the MSP430
71/// assembly code for a MachineFunction to the given output stream,
72/// using the given target machine description.  This should work
73/// regardless of whether the function is in SSA form.
74///
75FunctionPass *llvm::createMSP430CodePrinterPass(raw_ostream &o,
76                                                MSP430TargetMachine &tm,
77                                                bool fast, bool verbose) {
78  return new MSP430AsmPrinter(o, tm, tm.getTargetAsmInfo(), fast, verbose);
79}
80
81bool MSP430AsmPrinter::doInitialization(Module &M) {
82  Mang = new Mangler(M, "", TAI->getPrivateGlobalPrefix());
83  return false; // success
84}
85
86
87bool MSP430AsmPrinter::doFinalization(Module &M) {
88  return AsmPrinter::doFinalization(M);
89}
90
91bool MSP430AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
92  // Print out code for the function.
93  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
94       I != E; ++I) {
95    // Print a label for the basic block.
96    if (I != MF.begin()) {
97      printBasicBlockLabel(I, true , true);
98      O << '\n';
99    }
100
101    for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
102         II != E; ++II) {
103      // Print the assembly for the instruction.
104      O << "\t";
105      printMachineInstruction(II);
106    }
107
108    // Each Basic Block is separated by a newline
109    O << '\n';
110  }
111
112  // We didn't modify anything
113  return false;
114}
115
116void MSP430AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
117  ++EmittedInsts;
118
119  // Call the autogenerated instruction printer routines.
120  if (printInstruction(MI))
121    return;
122
123  assert(0 && "Should not happen");
124}
125
126void MSP430AsmPrinter::printOperand(const MachineInstr *MI, int OpNum,
127                                    const char* Modifier) {
128  const MachineOperand &MO = MI->getOperand(OpNum);
129  switch (MO.getType()) {
130  case MachineOperand::MO_Register:
131    assert (TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
132            "Virtual registers should be already mapped!");
133    O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
134    return;
135  case MachineOperand::MO_Immediate:
136    if (!Modifier || strcmp(Modifier, "nohash"))
137      O << '#';
138    O << MO.getImm();
139    return;
140  case MachineOperand::MO_MachineBasicBlock:
141    printBasicBlockLabel(MO.getMBB());
142    return;
143  case MachineOperand::MO_GlobalAddress: {
144    bool isMemOp  = Modifier && !strcmp(Modifier, "mem");
145    bool isCallOp = Modifier && !strcmp(Modifier, "call");
146    std::string Name = Mang->getValueName(MO.getGlobal());
147    assert(MO.getOffset() == 0 && "No offsets allowed!");
148
149    if (isCallOp)
150      O << '#';
151    else if (isMemOp)
152      O << '&';
153
154    O << Name;
155
156    return;
157  }
158  default:
159    assert(0 && "Not implemented yet!");
160  }
161}
162
163void MSP430AsmPrinter::printSrcMemOperand(const MachineInstr *MI, int OpNum,
164                                          const char* Modifier) {
165  const MachineOperand &Base = MI->getOperand(OpNum);
166  const MachineOperand &Disp = MI->getOperand(OpNum+1);
167
168  if (Base.isGlobal())
169    printOperand(MI, OpNum, "mem");
170  else if (Disp.isImm() && !Base.getReg())
171    printOperand(MI, OpNum);
172  else if (Base.getReg()) {
173    if (Disp.getImm()) {
174      printOperand(MI, OpNum + 1, "nohash");
175      O << '(';
176      printOperand(MI, OpNum);
177      O << ')';
178    } else {
179      O << '@';
180      printOperand(MI, OpNum);
181    }
182  } else
183    assert(0 && "Unsupported memory operand");
184}
185
186void MSP430AsmPrinter::printCCOperand(const MachineInstr *MI, int OpNum) {
187  unsigned CC = MI->getOperand(OpNum).getImm();
188
189  switch (CC) {
190  default:
191   assert(0 && "Unsupported CC code");
192   break;
193  case MSP430::COND_E:
194   O << 'e';
195   break;
196  case MSP430::COND_NE:
197   O << "ne";
198   break;
199  case MSP430::COND_HS:
200   O << "hs";
201   break;
202  case MSP430::COND_LO:
203   O << "lo";
204   break;
205  case MSP430::COND_GE:
206   O << "ge";
207   break;
208  case MSP430::COND_L:
209   O << 'l';
210   break;
211  }
212}
213