lib/Target/Sparc/AsmPrinter/SparcAsmPrinter.cpp

   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/DwarfWriter.h"
  23 #include "llvm/CodeGen/MachineFunctionPass.h"
  24 #include "llvm/CodeGen/MachineConstantPool.h"
  25 #include "llvm/CodeGen/MachineInstr.h"
  26 #include "llvm/Target/TargetAsmInfo.h"
  27 #include "llvm/Target/TargetData.h"
  28 #include "llvm/Target/TargetMachine.h"
  29 #include "llvm/Support/Mangler.h"
  30 #include "llvm/Support/raw_ostream.h"
  31 #include "llvm/ADT/Statistic.h"
  32 #include "llvm/ADT/StringExtras.h"
  33 #include "llvm/Support/CommandLine.h"
  34 #include "llvm/Support/MathExtras.h"
  35 #include <cctype>
  36 #include <cstring>
  37 #include <map>
  38 using namespace llvm;
  39
  40 STATISTIC(EmittedInsts, "Number of machine instrs printed");
  41
  42 namespace {
  43   class VISIBILITY_HIDDEN SparcAsmPrinter : public AsmPrinter {
  44     /// We name each basic block in a Function with a unique number, so
  45     /// that we can consistently refer to them later. This is cleared
  46     /// at the beginning of each call to runOnMachineFunction().
  47     ///
  48     typedef std::map<const Value *, unsigned> ValueMapTy;
  49     ValueMapTy NumberForBB;
  50   public:
  51     explicit SparcAsmPrinter(raw_ostream &O, TargetMachine &TM,
  52                              const TargetAsmInfo *T, CodeGenOpt::Level OL,
  53                              bool V)
  54       : AsmPrinter(O, TM, T, OL, V) {}
  55
  56     virtual const char *getPassName() const {
  57       return "Sparc Assembly Printer";
  58     }
  59
  60     void printModuleLevelGV(const GlobalVariable* GVar);
  61     void printOperand(const MachineInstr *MI, int opNum);
  62     void printMemOperand(const MachineInstr *MI, int opNum,
  63                          const char *Modifier = 0);
  64     void printCCOperand(const MachineInstr *MI, int opNum);
  65
  66     bool printInstruction(const MachineInstr *MI);  // autogenerated.
  67     bool runOnMachineFunction(MachineFunction &F);
  68     bool doInitialization(Module &M);
  69     bool doFinalization(Module &M);
  70     bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
  71                        unsigned AsmVariant, const char *ExtraCode);
  72     bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
  73                              unsigned AsmVariant, const char *ExtraCode);
  74   };
  75 } // end of anonymous namespace
  76
  77 #include "SparcGenAsmWriter.inc"
  78
  79 /// createSparcCodePrinterPass - Returns a pass that prints the SPARC
  80 /// assembly code for a MachineFunction to the given output stream,
  81 /// using the given target machine description.  This should work
  82 /// regardless of whether the function is in SSA form.
  83 ///
  84 FunctionPass *llvm::createSparcCodePrinterPass(raw_ostream &o,
  85                                                TargetMachine &tm,
  86                                                CodeGenOpt::Level OptLevel,
  87                                                bool verbose) {
  88   return new SparcAsmPrinter(o, tm, tm.getTargetAsmInfo(), OptLevel, verbose);
  89 }
  90
  91 /// runOnMachineFunction - This uses the printInstruction()
  92 /// method to print assembly for each instruction.
  93 ///
  94 bool SparcAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
  95   this->MF = &MF;
  96
  97   SetupMachineFunction(MF);
  98
  99   // Print out constants referenced by the function
 100   EmitConstantPool(MF.getConstantPool());
 101
 102   // BBNumber is used here so that a given Printer will never give two
 103   // BBs the same name. (If you have a better way, please let me know!)
 104   static unsigned BBNumber = 0;
 105
 106   O << "\n\n";
 107
 108   // Print out the label for the function.
 109   const Function *F = MF.getFunction();
 110   SwitchToSection(TAI->SectionForGlobal(F));
 111   EmitAlignment(4, F);
 112   O << "\t.globl\t" << CurrentFnName << '\n';
 113
 114   printVisibility(CurrentFnName, F->getVisibility());
 115
 116   O << "\t.type\t" << CurrentFnName << ", #function\n";
 117   O << CurrentFnName << ":\n";
 118
 119   // Number each basic block so that we can consistently refer to them
 120   // in PC-relative references.
 121   // FIXME: Why not use the MBB numbers?
 122   NumberForBB.clear();
 123   for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
 124        I != E; ++I) {
 125     NumberForBB[I->getBasicBlock()] = BBNumber++;
 126   }
 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 (I != MF.begin()) {
 133       printBasicBlockLabel(I, true, true);
 134       O << '\n';
 135     }
 136     for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
 137          II != E; ++II) {
 138       // Print the assembly for the instruction.
 139       printInstruction(II);
 140       ++EmittedInsts;
 141     }
 142   }
 143
 144   // We didn't modify anything.
 145   return false;
 146 }
 147
 148 void SparcAsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
 149   const MachineOperand &MO = MI->getOperand (opNum);
 150   const TargetRegisterInfo &RI = *TM.getRegisterInfo();
 151   bool CloseParen = false;
 152   if (MI->getOpcode() == SP::SETHIi && !MO.isReg() && !MO.isImm()) {
 153     O << "%hi(";
 154     CloseParen = true;
 155   } else if ((MI->getOpcode() == SP::ORri || MI->getOpcode() == SP::ADDri) &&
 156              !MO.isReg() && !MO.isImm()) {
 157     O << "%lo(";
 158     CloseParen = true;
 159   }
 160   switch (MO.getType()) {
 161   case MachineOperand::MO_Register:
 162     if (TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
 163       O << "%" << LowercaseString (RI.get(MO.getReg()).AsmName);
 164     else
 165       O << "%reg" << MO.getReg();
 166     break;
 167
 168   case MachineOperand::MO_Immediate:
 169     O << (int)MO.getImm();
 170     break;
 171   case MachineOperand::MO_MachineBasicBlock:
 172     printBasicBlockLabel(MO.getMBB());
 173     return;
 174   case MachineOperand::MO_GlobalAddress:
 175     {
 176       const GlobalValue *GV = MO.getGlobal();
 177       O << Mang->getValueName(GV);
 178     }
 179     break;
 180   case MachineOperand::MO_ExternalSymbol:
 181     O << MO.getSymbolName();
 182     break;
 183   case MachineOperand::MO_ConstantPoolIndex:
 184     O << TAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
 185       << MO.getIndex();
 186     break;
 187   default:
 188     O << "<unknown operand type>"; abort (); break;
 189   }
 190   if (CloseParen) O << ")";
 191 }
 192
 193 void SparcAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum,
 194                                       const char *Modifier) {
 195   printOperand(MI, opNum);
 196
 197   // If this is an ADD operand, emit it like normal operands.
 198   if (Modifier && !strcmp(Modifier, "arith")) {
 199     O << ", ";
 200     printOperand(MI, opNum+1);
 201     return;
 202   }
 203
 204   if (MI->getOperand(opNum+1).isReg() &&
 205       MI->getOperand(opNum+1).getReg() == SP::G0)
 206     return;   // don't print "+%g0"
 207   if (MI->getOperand(opNum+1).isImm() &&
 208       MI->getOperand(opNum+1).getImm() == 0)
 209     return;   // don't print "+0"
 210
 211   O << "+";
 212   if (MI->getOperand(opNum+1).isGlobal() ||
 213       MI->getOperand(opNum+1).isCPI()) {
 214     O << "%lo(";
 215     printOperand(MI, opNum+1);
 216     O << ")";
 217   } else {
 218     printOperand(MI, opNum+1);
 219   }
 220 }
 221
 222 void SparcAsmPrinter::printCCOperand(const MachineInstr *MI, int opNum) {
 223   int CC = (int)MI->getOperand(opNum).getImm();
 224   O << SPARCCondCodeToString((SPCC::CondCodes)CC);
 225 }
 226
 227 bool SparcAsmPrinter::doInitialization(Module &M) {
 228   Mang = new Mangler(M, "", TAI->getPrivateGlobalPrefix());
 229   return false; // success
 230 }
 231
 232 bool SparcAsmPrinter::doFinalization(Module &M) {
 233   // Print out module-level global variables here.
 234   for (Module::const_global_iterator I = M.global_begin(), E = M.global_end();
 235        I != E; ++I)
 236     printModuleLevelGV(I);
 237
 238   O << '\n';
 239
 240   return AsmPrinter::doFinalization(M);
 241 }
 242
 243 void SparcAsmPrinter::printModuleLevelGV(const GlobalVariable* GVar) {
 244   const TargetData *TD = TM.getTargetData();
 245
 246   if (!GVar->hasInitializer())
 247     return;  // External global require no code
 248
 249   // Check to see if this is a special global used by LLVM, if so, emit it.
 250   if (EmitSpecialLLVMGlobal(GVar))
 251     return;
 252
 253   O << "\n\n";
 254   std::string name = Mang->getValueName(GVar);
 255   Constant *C = GVar->getInitializer();
 256   unsigned Size = TD->getTypePaddedSize(C->getType());
 257   unsigned Align = TD->getPreferredAlignment(GVar);
 258
 259   printVisibility(name, GVar->getVisibility());
 260
 261   SwitchToSection(TAI->SectionForGlobal(GVar));
 262
 263   if (C->isNullValue() && !GVar->hasSection()) {
 264     if (!GVar->isThreadLocal() &&
 265         (GVar->hasLocalLinkage() || GVar->isWeakForLinker())) {
 266       if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
 267
 268       if (GVar->hasLocalLinkage())
 269         O << "\t.local " << name << '\n';
 270
 271       O << TAI->getCOMMDirective() << name << ',' << Size;
 272       if (TAI->getCOMMDirectiveTakesAlignment())
 273         O << ',' << (1 << Align);
 274
 275       O << '\n';
 276       return;
 277     }
 278   }
 279
 280   switch (GVar->getLinkage()) {
 281    case GlobalValue::CommonLinkage:
 282    case GlobalValue::LinkOnceAnyLinkage:
 283    case GlobalValue::LinkOnceODRLinkage:
 284    case GlobalValue::WeakAnyLinkage: // FIXME: Verify correct for weak.
 285    case GlobalValue::WeakODRLinkage: // FIXME: Verify correct for weak.
 286     // Nonnull linkonce -> weak
 287     O << "\t.weak " << name << '\n';
 288     break;
 289    case GlobalValue::AppendingLinkage:
 290     // FIXME: appending linkage variables should go into a section of
 291     // their name or something.  For now, just emit them as external.
 292    case GlobalValue::ExternalLinkage:
 293     // If external or appending, declare as a global symbol
 294     O << TAI->getGlobalDirective() << name << '\n';
 295     // FALL THROUGH
 296    case GlobalValue::PrivateLinkage:
 297    case GlobalValue::InternalLinkage:
 298     break;
 299    case GlobalValue::GhostLinkage:
 300     cerr << "Should not have any unmaterialized functions!\n";
 301     abort();
 302    case GlobalValue::DLLImportLinkage:
 303     cerr << "DLLImport linkage is not supported by this target!\n";
 304     abort();
 305    case GlobalValue::DLLExportLinkage:
 306     cerr << "DLLExport linkage is not supported by this target!\n";
 307     abort();
 308    default:
 309     assert(0 && "Unknown linkage type!");
 310   }
 311
 312   EmitAlignment(Align, GVar);
 313
 314   if (TAI->hasDotTypeDotSizeDirective()) {
 315     O << "\t.type " << name << ",#object\n";
 316     O << "\t.size " << name << ',' << Size << '\n';
 317   }
 318
 319   O << name << ":\n";
 320   EmitGlobalConstant(C);
 321 }
 322
 323 /// PrintAsmOperand - Print out an operand for an inline asm expression.
 324 ///
 325 bool SparcAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
 326                                       unsigned AsmVariant,
 327                                       const char *ExtraCode) {
 328   if (ExtraCode && ExtraCode[0]) {
 329     if (ExtraCode[1] != 0) return true; // Unknown modifier.
 330
 331     switch (ExtraCode[0]) {
 332     default: return true;  // Unknown modifier.
 333     case 'r':
 334      break;
 335     }
 336   }
 337
 338   printOperand(MI, OpNo);
 339
 340   return false;
 341 }
 342
 343 bool SparcAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
 344                                             unsigned OpNo,
 345                                             unsigned AsmVariant,
 346                                             const char *ExtraCode) {
 347   if (ExtraCode && ExtraCode[0])
 348     return true;  // Unknown modifier
 349
 350   O << '[';
 351   printMemOperand(MI, OpNo);
 352   O << ']';
 353
 354   return false;
 355 }