SparcAsmPrinter.cpp revision d735b8019b0f297d7c14b55adcd887af24d8e602 
1//===-- SparcAsmPrinter.cpp - Sparc 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 GAS-format SPARC assembly language.
12//
13//===----------------------------------------------------------------------===//
14
15#define DEBUG_TYPE "asm-printer"
16#include "Sparc.h"
17#include "SparcInstrInfo.h"
18#include "llvm/Constants.h"
19#include "llvm/DerivedTypes.h"
20#include "llvm/Module.h"
21#include "llvm/CodeGen/AsmPrinter.h"
22#include "llvm/CodeGen/MachineFunctionPass.h"
23#include "llvm/CodeGen/MachineConstantPool.h"
24#include "llvm/CodeGen/MachineInstr.h"
25#include "llvm/Target/TargetAsmInfo.h"
26#include "llvm/Target/TargetData.h"
27#include "llvm/Target/TargetMachine.h"
28#include "llvm/Support/Mangler.h"
29#include "llvm/Support/raw_ostream.h"
30#include "llvm/ADT/Statistic.h"
31#include "llvm/ADT/StringExtras.h"
32#include "llvm/Support/CommandLine.h"
33#include "llvm/Support/MathExtras.h"
34#include <cctype>
35#include <cstring>
36#include <map>
37using namespace llvm;
38
39STATISTIC(EmittedInsts, "Number of machine instrs printed");
40
41namespace {
42  struct VISIBILITY_HIDDEN SparcAsmPrinter : public AsmPrinter {
43    SparcAsmPrinter(raw_ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
44      : AsmPrinter(O, TM, T) {
45    }
46
47    /// We name each basic block in a Function with a unique number, so
48    /// that we can consistently refer to them later. This is cleared
49    /// at the beginning of each call to runOnMachineFunction().
50    ///
51    typedef std::map<const Value *, unsigned> ValueMapTy;
52    ValueMapTy NumberForBB;
53
54    virtual const char *getPassName() const {
55      return "Sparc Assembly Printer";
56    }
57
58    void printModuleLevelGV(const GlobalVariable* GVar);
59    void printOperand(const MachineInstr *MI, int opNum);
60    void printMemOperand(const MachineInstr *MI, int opNum,
61                         const char *Modifier = 0);
62    void printCCOperand(const MachineInstr *MI, int opNum);
63
64    bool printInstruction(const MachineInstr *MI);  // autogenerated.
65    bool runOnMachineFunction(MachineFunction &F);
66    bool doInitialization(Module &M);
67    bool doFinalization(Module &M);
68  };
69} // end of anonymous namespace
70
71#include "SparcGenAsmWriter.inc"
72
73/// createSparcCodePrinterPass - Returns a pass that prints the SPARC
74/// assembly code for a MachineFunction to the given output stream,
75/// using the given target machine description.  This should work
76/// regardless of whether the function is in SSA form.
77///
78FunctionPass *llvm::createSparcCodePrinterPass(raw_ostream &o,
79                                               TargetMachine &tm) {
80  return new SparcAsmPrinter(o, tm, tm.getTargetAsmInfo());
81}
82
83/// runOnMachineFunction - This uses the printInstruction()
84/// method to print assembly for each instruction.
85///
86bool SparcAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
87  SetupMachineFunction(MF);
88
89  // Print out constants referenced by the function
90  EmitConstantPool(MF.getConstantPool());
91
92  // BBNumber is used here so that a given Printer will never give two
93  // BBs the same name. (If you have a better way, please let me know!)
94  static unsigned BBNumber = 0;
95
96  O << "\n\n";
97  // What's my mangled name?
98  CurrentFnName = Mang->getValueName(MF.getFunction());
99
100  // Print out the label for the function.
101  const Function *F = MF.getFunction();
102  SwitchToSection(TAI->SectionForGlobal(F));
103  EmitAlignment(4, F);
104  O << "\t.globl\t" << CurrentFnName << '\n';
105
106  printVisibility(CurrentFnName, F->getVisibility());
107
108  O << "\t.type\t" << CurrentFnName << ", #function\n";
109  O << CurrentFnName << ":\n";
110
111  // Number each basic block so that we can consistently refer to them
112  // in PC-relative references.
113  // FIXME: Why not use the MBB numbers?
114  NumberForBB.clear();
115  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
116       I != E; ++I) {
117    NumberForBB[I->getBasicBlock()] = BBNumber++;
118  }
119
120  // Print out code for the function.
121  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
122       I != E; ++I) {
123    // Print a label for the basic block.
124    if (I != MF.begin()) {
125      printBasicBlockLabel(I, true, true);
126      O << '\n';
127    }
128    for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
129         II != E; ++II) {
130      // Print the assembly for the instruction.
131      printInstruction(II);
132      ++EmittedInsts;
133    }
134  }
135
136  // We didn't modify anything.
137  return false;
138}
139
140void SparcAsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
141  const MachineOperand &MO = MI->getOperand (opNum);
142  const TargetRegisterInfo &RI = *TM.getRegisterInfo();
143  bool CloseParen = false;
144  if (MI->getOpcode() == SP::SETHIi && !MO.isReg() && !MO.isImm()) {
145    O << "%hi(";
146    CloseParen = true;
147  } else if ((MI->getOpcode() == SP::ORri || MI->getOpcode() == SP::ADDri) &&
148             !MO.isReg() && !MO.isImm()) {
149    O << "%lo(";
150    CloseParen = true;
151  }
152  switch (MO.getType()) {
153  case MachineOperand::MO_Register:
154    if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
155      O << "%" << LowercaseString (RI.get(MO.getReg()).AsmName);
156    else
157      O << "%reg" << MO.getReg();
158    break;
159
160  case MachineOperand::MO_Immediate:
161    O << (int)MO.getImm();
162    break;
163  case MachineOperand::MO_MachineBasicBlock:
164    printBasicBlockLabel(MO.getMBB());
165    return;
166  case MachineOperand::MO_GlobalAddress:
167    O << Mang->getValueName(MO.getGlobal());
168    break;
169  case MachineOperand::MO_ExternalSymbol:
170    O << MO.getSymbolName();
171    break;
172  case MachineOperand::MO_ConstantPoolIndex:
173    O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
174      << MO.getIndex();
175    break;
176  default:
177    O << "<unknown operand type>"; abort (); break;
178  }
179  if (CloseParen) O << ")";
180}
181
182void SparcAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum,
183                                      const char *Modifier) {
184  printOperand(MI, opNum);
185
186  // If this is an ADD operand, emit it like normal operands.
187  if (Modifier && !strcmp(Modifier, "arith")) {
188    O << ", ";
189    printOperand(MI, opNum+1);
190    return;
191  }
192
193  if (MI->getOperand(opNum+1).isReg() &&
194      MI->getOperand(opNum+1).getReg() == SP::G0)
195    return;   // don't print "+%g0"
196  if (MI->getOperand(opNum+1).isImm() &&
197      MI->getOperand(opNum+1).getImm() == 0)
198    return;   // don't print "+0"
199
200  O << "+";
201  if (MI->getOperand(opNum+1).isGlobal() ||
202      MI->getOperand(opNum+1).isCPI()) {
203    O << "%lo(";
204    printOperand(MI, opNum+1);
205    O << ")";
206  } else {
207    printOperand(MI, opNum+1);
208  }
209}
210
211void SparcAsmPrinter::printCCOperand(const MachineInstr *MI, int opNum) {
212  int CC = (int)MI->getOperand(opNum).getImm();
213  O << SPARCCondCodeToString((SPCC::CondCodes)CC);
214}
215
216
217
218bool SparcAsmPrinter::doInitialization(Module &M) {
219  Mang = new Mangler(M);
220  return false; // success
221}
222
223bool SparcAsmPrinter::doFinalization(Module &M) {
224  // Print out module-level global variables here.
225  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
226       I != E; ++I)
227    printModuleLevelGV(I);
228
229  O << '\n';
230
231  return AsmPrinter::doFinalization(M);
232}
233
234void SparcAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
235  const TargetData *TD = TM.getTargetData();
236
237  if (!GVar->hasInitializer())
238    return;  // External global require no code
239
240  // Check to see if this is a special global used by LLVM, if so, emit it.
241  if (EmitSpecialLLVMGlobal(GVar))
242    return;
243
244  O << "\n\n";
245  std::string name = Mang->getValueName(GVar);
246  Constant *C = GVar->getInitializer();
247  unsigned Size = TD->getABITypeSize(C->getType());
248  unsigned Align = TD->getPreferredAlignment(GVar);
249
250  printVisibility(name, GVar->getVisibility());
251
252  SwitchToSection(TAI->SectionForGlobal(GVar));
253
254  if (C->isNullValue() && !GVar->hasSection()) {
255    if (!GVar->isThreadLocal() &&
256        (GVar->hasInternalLinkage() || GVar->mayBeOverridden())) {
257      if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
258
259      if (GVar->hasInternalLinkage())
260        O << "\t.local " << name << '\n';
261
262      O << TAI->getCOMMDirective() << name << ',' << Size;
263      if (TAI->getCOMMDirectiveTakesAlignment())
264        O << ',' << (1 << Align);
265
266      O << '\n';
267      return;
268    }
269  }
270
271  switch (GVar->getLinkage()) {
272   case GlobalValue::CommonLinkage:
273   case GlobalValue::LinkOnceLinkage:
274   case GlobalValue::WeakLinkage:   // FIXME: Verify correct for weak.
275    // Nonnull linkonce -> weak
276    O << "\t.weak " << name << '\n';
277    break;
278   case GlobalValue::AppendingLinkage:
279    // FIXME: appending linkage variables should go into a section of
280    // their name or something.  For now, just emit them as external.
281   case GlobalValue::ExternalLinkage:
282    // If external or appending, declare as a global symbol
283    O << TAI->getGlobalDirective() << name << '\n';
284    // FALL THROUGH
285   case GlobalValue::InternalLinkage:
286    break;
287   case GlobalValue::GhostLinkage:
288    cerr << "Should not have any unmaterialized functions!\n";
289    abort();
290   case GlobalValue::DLLImportLinkage:
291    cerr << "DLLImport linkage is not supported by this target!\n";
292    abort();
293   case GlobalValue::DLLExportLinkage:
294    cerr << "DLLExport linkage is not supported by this target!\n";
295    abort();
296   default:
297    assert(0 && "Unknown linkage type!");
298  }
299
300  EmitAlignment(Align, GVar);
301
302  if (TAI->hasDotTypeDotSizeDirective()) {
303    O << "\t.type " << name << ",#object\n";
304    O << "\t.size " << name << ',' << Size << '\n';
305  }
306
307  O << name << ":\n";
308  EmitGlobalConstant(C);
309}
310