MSP430AsmPrinter.cpp revision 90f8b7073dd472afb21bc33be0f24391e7a4505b 
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/FormattedStream.h"
33#include "llvm/Support/Mangler.h"
34#include "llvm/Support/ErrorHandling.h"
35
36using namespace llvm;
37
38STATISTIC(EmittedInsts, "Number of machine instrs printed");
39
40namespace {
41  class VISIBILITY_HIDDEN MSP430AsmPrinter : public AsmPrinter {
42  public:
43    MSP430AsmPrinter(formatted_raw_ostream &O, TargetMachine &TM,
44                     const TargetAsmInfo *TAI, bool V)
45      : AsmPrinter(O, TM, TAI, V) {}
46
47    virtual const char *getPassName() const {
48      return "MSP430 Assembly Printer";
49    }
50
51    void printOperand(const MachineInstr *MI, int OpNum,
52                      const char* Modifier = 0);
53    void printSrcMemOperand(const MachineInstr *MI, int OpNum,
54                            const char* Modifier = 0);
55    void printCCOperand(const MachineInstr *MI, int OpNum);
56    bool printInstruction(const MachineInstr *MI);  // autogenerated.
57    void printMachineInstruction(const MachineInstr * MI);
58
59    void emitFunctionHeader(const MachineFunction &MF);
60    bool runOnMachineFunction(MachineFunction &F);
61    bool doInitialization(Module &M);
62
63    void getAnalysisUsage(AnalysisUsage &AU) const {
64      AsmPrinter::getAnalysisUsage(AU);
65      AU.setPreservesAll();
66    }
67  };
68} // end of anonymous namespace
69
70#include "MSP430GenAsmWriter.inc"
71
72/// createMSP430CodePrinterPass - Returns a pass that prints the MSP430
73/// assembly code for a MachineFunction to the given output stream,
74/// using the given target machine description.  This should work
75/// regardless of whether the function is in SSA form.
76///
77FunctionPass *llvm::createMSP430CodePrinterPass(formatted_raw_ostream &o,
78                                                TargetMachine &tm,
79                                                bool verbose) {
80  return new MSP430AsmPrinter(o, tm, tm.getTargetAsmInfo(), verbose);
81}
82
83bool MSP430AsmPrinter::doInitialization(Module &M) {
84  Mang = new Mangler(M, "", TAI->getPrivateGlobalPrefix(),
85                     TAI->getLinkerPrivateGlobalPrefix());
86  return false; // success
87}
88
89
90void MSP430AsmPrinter::emitFunctionHeader(const MachineFunction &MF) {
91  const Function *F = MF.getFunction();
92
93  SwitchToSection(TAI->SectionForGlobal(F));
94
95  unsigned FnAlign = MF.getAlignment();
96  EmitAlignment(FnAlign, F);
97
98  switch (F->getLinkage()) {
99  default: llvm_unreachable("Unknown linkage type!");
100  case Function::InternalLinkage:  // Symbols default to internal.
101  case Function::PrivateLinkage:
102  case Function::LinkerPrivateLinkage:
103    break;
104  case Function::ExternalLinkage:
105    O << "\t.globl\t" << CurrentFnName << '\n';
106    break;
107  case Function::LinkOnceAnyLinkage:
108  case Function::LinkOnceODRLinkage:
109  case Function::WeakAnyLinkage:
110  case Function::WeakODRLinkage:
111    O << "\t.weak\t" << CurrentFnName << '\n';
112    break;
113  }
114
115  printVisibility(CurrentFnName, F->getVisibility());
116
117  O << "\t.type\t" << CurrentFnName << ",@function\n"
118    << CurrentFnName << ":\n";
119}
120
121bool MSP430AsmPrinter::runOnMachineFunction(MachineFunction &MF) {
122  SetupMachineFunction(MF);
123  O << "\n\n";
124
125  // Print the 'header' of function
126  emitFunctionHeader(MF);
127
128  // Print out code for the function.
129  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
130       I != E; ++I) {
131    // Print a label for the basic block.
132    if (!VerboseAsm && (I->pred_empty() || I->isOnlyReachableByFallthrough())) {
133      // This is an entry block or a block that's only reachable via a
134      // fallthrough edge. In non-VerboseAsm mode, don't print the label.
135    } else {
136      printBasicBlockLabel(I, true, true, VerboseAsm);
137      O << '\n';
138    }
139
140    for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
141         II != E; ++II)
142      // Print the assembly for the instruction.
143      printMachineInstruction(II);
144  }
145
146  if (TAI->hasDotTypeDotSizeDirective())
147    O << "\t.size\t" << CurrentFnName << ", .-" << CurrentFnName << '\n';
148
149  O.flush();
150
151  // We didn't modify anything
152  return false;
153}
154
155void MSP430AsmPrinter::printMachineInstruction(const MachineInstr *MI) {
156  ++EmittedInsts;
157
158  // Call the autogenerated instruction printer routines.
159  if (printInstruction(MI))
160    return;
161
162  llvm_unreachable("Should not happen");
163}
164
165void MSP430AsmPrinter::printOperand(const MachineInstr *MI, int OpNum,
166                                    const char* Modifier) {
167  const MachineOperand &MO = MI->getOperand(OpNum);
168  switch (MO.getType()) {
169  case MachineOperand::MO_Register:
170    assert (TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
171            "Virtual registers should be already mapped!");
172    O << TM.getRegisterInfo()->get(MO.getReg()).AsmName;
173    return;
174  case MachineOperand::MO_Immediate:
175    if (!Modifier || strcmp(Modifier, "nohash"))
176      O << '#';
177    O << MO.getImm();
178    return;
179  case MachineOperand::MO_MachineBasicBlock:
180    printBasicBlockLabel(MO.getMBB());
181    return;
182  case MachineOperand::MO_GlobalAddress: {
183    bool isMemOp  = Modifier && !strcmp(Modifier, "mem");
184    bool isCallOp = Modifier && !strcmp(Modifier, "call");
185    std::string Name = Mang->getMangledName(MO.getGlobal());
186    assert(MO.getOffset() == 0 && "No offsets allowed!");
187
188    if (isCallOp)
189      O << '#';
190    else if (isMemOp)
191      O << '&';
192
193    O << Name;
194
195    return;
196  }
197  case MachineOperand::MO_ExternalSymbol: {
198    bool isCallOp = Modifier && !strcmp(Modifier, "call");
199    std::string Name(TAI->getGlobalPrefix());
200    Name += MO.getSymbolName();
201    if (isCallOp)
202      O << '#';
203    O << Name;
204    return;
205  }
206  default:
207    llvm_unreachable("Not implemented yet!");
208  }
209}
210
211void MSP430AsmPrinter::printSrcMemOperand(const MachineInstr *MI, int OpNum,
212                                          const char* Modifier) {
213  const MachineOperand &Base = MI->getOperand(OpNum);
214  const MachineOperand &Disp = MI->getOperand(OpNum+1);
215
216  if (Base.isGlobal())
217    printOperand(MI, OpNum, "mem");
218  else if (Disp.isImm() && !Base.getReg())
219    printOperand(MI, OpNum);
220  else if (Base.getReg()) {
221    if (Disp.getImm()) {
222      printOperand(MI, OpNum + 1, "nohash");
223      O << '(';
224      printOperand(MI, OpNum);
225      O << ')';
226    } else {
227      O << '@';
228      printOperand(MI, OpNum);
229    }
230  } else
231    llvm_unreachable("Unsupported memory operand");
232}
233
234void MSP430AsmPrinter::printCCOperand(const MachineInstr *MI, int OpNum) {
235  unsigned CC = MI->getOperand(OpNum).getImm();
236
237  switch (CC) {
238  default:
239   llvm_unreachable("Unsupported CC code");
240   break;
241  case MSP430::COND_E:
242   O << "eq";
243   break;
244  case MSP430::COND_NE:
245   O << "ne";
246   break;
247  case MSP430::COND_HS:
248   O << "hs";
249   break;
250  case MSP430::COND_LO:
251   O << "lo";
252   break;
253  case MSP430::COND_GE:
254   O << "ge";
255   break;
256  case MSP430::COND_L:
257   O << 'l';
258   break;
259  }
260}
261