SparcAsmPrinter.cpp revision f5b6a47bb57fb5ffc734416d4d5d993e1a06273b 
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/ADT/Statistic.h"
30#include "llvm/ADT/StringExtras.h"
31#include "llvm/Support/CommandLine.h"
32#include "llvm/Support/MathExtras.h"
33#include <cctype>
34#include <cstring>
35#include <map>
36using namespace llvm;
37
38STATISTIC(EmittedInsts, "Number of machine instrs printed");
39
40namespace {
41  struct VISIBILITY_HIDDEN SparcAsmPrinter : public AsmPrinter {
42    SparcAsmPrinter(std::ostream &O, TargetMachine &TM, const TargetAsmInfo *T)
43      : AsmPrinter(O, TM, T) {
44    }
45
46    /// We name each basic block in a Function with a unique number, so
47    /// that we can consistently refer to them later. This is cleared
48    /// at the beginning of each call to runOnMachineFunction().
49    ///
50    typedef std::map<const Value *, unsigned> ValueMapTy;
51    ValueMapTy NumberForBB;
52
53    virtual const char *getPassName() const {
54      return "Sparc Assembly Printer";
55    }
56
57    void printModuleLevelGV(const GlobalVariable* GVar);
58    void printOperand(const MachineInstr *MI, int opNum);
59    void printMemOperand(const MachineInstr *MI, int opNum,
60                         const char *Modifier = 0);
61    void printCCOperand(const MachineInstr *MI, int opNum);
62
63    bool printInstruction(const MachineInstr *MI);  // autogenerated.
64    bool runOnMachineFunction(MachineFunction &F);
65    std::string getSectionForFunction(const Function &F) const;
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(std::ostream &o,
79                                               TargetMachine &tm) {
80  return new SparcAsmPrinter(o, tm, tm.getTargetAsmInfo());
81}
82
83// Substitute old hook with new one temporary
84std::string SparcAsmPrinter::getSectionForFunction(const Function &F) const {
85  return TAI->SectionForGlobal(&F);
86}
87
88/// runOnMachineFunction - This uses the printInstruction()
89/// method to print assembly for each instruction.
90///
91bool SparcAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
92  SetupMachineFunction(MF);
93
94  // Print out constants referenced by the function
95  EmitConstantPool(MF.getConstantPool());
96
97  // BBNumber is used here so that a given Printer will never give two
98  // BBs the same name. (If you have a better way, please let me know!)
99  static unsigned BBNumber = 0;
100
101  O << "\n\n";
102  // What's my mangled name?
103  CurrentFnName = Mang->getValueName(MF.getFunction());
104
105  // Print out the label for the function.
106  const Function *F = MF.getFunction();
107  SwitchToTextSection(getSectionForFunction(*F).c_str(), F);
108  EmitAlignment(4, F);
109  O << "\t.globl\t" << CurrentFnName << '\n';
110
111  printVisibility(CurrentFnName, F->getVisibility());
112
113  O << "\t.type\t" << CurrentFnName << ", #function\n";
114  O << CurrentFnName << ":\n";
115
116  // Number each basic block so that we can consistently refer to them
117  // in PC-relative references.
118  // FIXME: Why not use the MBB numbers?
119  NumberForBB.clear();
120  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
121       I != E; ++I) {
122    NumberForBB[I->getBasicBlock()] = BBNumber++;
123  }
124
125  // Print out code for the function.
126  for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
127       I != E; ++I) {
128    // Print a label for the basic block.
129    if (I != MF.begin()) {
130      printBasicBlockLabel(I, true, true);
131      O << '\n';
132    }
133    for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
134         II != E; ++II) {
135      // Print the assembly for the instruction.
136      printInstruction(II);
137      ++EmittedInsts;
138    }
139  }
140
141  // We didn't modify anything.
142  return false;
143}
144
145void SparcAsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
146  const MachineOperand &MO = MI->getOperand (opNum);
147  const TargetRegisterInfo &RI = *TM.getRegisterInfo();
148  bool CloseParen = false;
149  if (MI->getOpcode() == SP::SETHIi && !MO.isRegister() && !MO.isImmediate()) {
150    O << "%hi(";
151    CloseParen = true;
152  } else if ((MI->getOpcode() == SP::ORri || MI->getOpcode() == SP::ADDri)
153             && !MO.isRegister() && !MO.isImmediate()) {
154    O << "%lo(";
155    CloseParen = true;
156  }
157  switch (MO.getType()) {
158  case MachineOperand::MO_Register:
159    if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
160      O << "%" << LowercaseString (RI.get(MO.getReg()).AsmName);
161    else
162      O << "%reg" << MO.getReg();
163    break;
164
165  case MachineOperand::MO_Immediate:
166    O << (int)MO.getImm();
167    break;
168  case MachineOperand::MO_MachineBasicBlock:
169    printBasicBlockLabel(MO.getMBB());
170    return;
171  case MachineOperand::MO_GlobalAddress:
172    O << Mang->getValueName(MO.getGlobal());
173    break;
174  case MachineOperand::MO_ExternalSymbol:
175    O << MO.getSymbolName();
176    break;
177  case MachineOperand::MO_ConstantPoolIndex:
178    O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
179      << MO.getIndex();
180    break;
181  default:
182    O << "<unknown operand type>"; abort (); break;
183  }
184  if (CloseParen) O << ")";
185}
186
187void SparcAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum,
188                                      const char *Modifier) {
189  printOperand(MI, opNum);
190
191  // If this is an ADD operand, emit it like normal operands.
192  if (Modifier && !strcmp(Modifier, "arith")) {
193    O << ", ";
194    printOperand(MI, opNum+1);
195    return;
196  }
197
198  if (MI->getOperand(opNum+1).isRegister() &&
199      MI->getOperand(opNum+1).getReg() == SP::G0)
200    return;   // don't print "+%g0"
201  if (MI->getOperand(opNum+1).isImmediate() &&
202      MI->getOperand(opNum+1).getImm() == 0)
203    return;   // don't print "+0"
204
205  O << "+";
206  if (MI->getOperand(opNum+1).isGlobalAddress() ||
207      MI->getOperand(opNum+1).isConstantPoolIndex()) {
208    O << "%lo(";
209    printOperand(MI, opNum+1);
210    O << ")";
211  } else {
212    printOperand(MI, opNum+1);
213  }
214}
215
216void SparcAsmPrinter::printCCOperand(const MachineInstr *MI, int opNum) {
217  int CC = (int)MI->getOperand(opNum).getImm();
218  O << SPARCCondCodeToString((SPCC::CondCodes)CC);
219}
220
221
222
223bool SparcAsmPrinter::doInitialization(Module &M) {
224  Mang = new Mangler(M);
225  return false; // success
226}
227
228bool SparcAsmPrinter::doFinalization(Module &M) {
229  // Print out module-level global variables here.
230  for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
231       I != E; ++I)
232    printModuleLevelGV(I);
233
234  O << '\n';
235
236  return AsmPrinter::doFinalization(M);
237}
238
239void SparcAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
240  const TargetData *TD = TM.getTargetData();
241
242  if (!GVar->hasInitializer())
243    return;  // External global require no code
244
245  // Check to see if this is a special global used by LLVM, if so, emit it.
246  if (EmitSpecialLLVMGlobal(GVar))
247    return;
248
249  O << "\n\n";
250  std::string SectionName = TAI->SectionForGlobal(GVar);
251  std::string name = Mang->getValueName(GVar);
252  Constant *C = GVar->getInitializer();
253  unsigned Size = TD->getABITypeSize(C->getType());
254  unsigned Align = TD->getPreferredAlignment(GVar);
255
256  printVisibility(name, GVar->getVisibility());
257
258  SwitchToDataSection(SectionName.c_str());
259
260  if (C->isNullValue() && !GVar->hasSection()) {
261    if (!GVar->isThreadLocal() &&
262        (GVar->hasInternalLinkage() || GVar->isWeakForLinker())) {
263      if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
264
265      if (GVar->hasInternalLinkage())
266        O << "\t.local " << name << '\n';
267
268      O << TAI->getCOMMDirective() << name << ',' << Size;
269      if (TAI->getCOMMDirectiveTakesAlignment())
270        O << ',' << (1 << Align);
271
272      O << '\n';
273      return;
274    }
275  }
276
277  switch (GVar->getLinkage()) {
278   case GlobalValue::CommonLinkage:
279   case GlobalValue::LinkOnceLinkage:
280   case GlobalValue::WeakLinkage:   // FIXME: Verify correct for weak.
281    // Nonnull linkonce -> weak
282    O << "\t.weak " << name << '\n';
283    break;
284   case GlobalValue::AppendingLinkage:
285    // FIXME: appending linkage variables should go into a section of
286    // their name or something.  For now, just emit them as external.
287   case GlobalValue::ExternalLinkage:
288    // If external or appending, declare as a global symbol
289    O << TAI->getGlobalDirective() << name << '\n';
290    // FALL THROUGH
291   case GlobalValue::InternalLinkage:
292    break;
293   case GlobalValue::GhostLinkage:
294    cerr << "Should not have any unmaterialized functions!\n";
295    abort();
296   case GlobalValue::DLLImportLinkage:
297    cerr << "DLLImport linkage is not supported by this target!\n";
298    abort();
299   case GlobalValue::DLLExportLinkage:
300    cerr << "DLLExport linkage is not supported by this target!\n";
301    abort();
302   default:
303    assert(0 && "Unknown linkage type!");
304  }
305
306  EmitAlignment(Align, GVar);
307
308  if (TAI->hasDotTypeDotSizeDirective()) {
309    O << "\t.type " << name << ",#object\n";
310    O << "\t.size " << name << ',' << Size << '\n';
311  }
312
313  O << name << ":\n";
314  EmitGlobalConstant(C);
315}
316