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 "SparcTargetMachine.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/MachineFunctionPass.h"
  25 #include "llvm/CodeGen/MachineConstantPool.h"
  26 #include "llvm/CodeGen/MachineInstr.h"
  27 #include "llvm/MC/MCAsmInfo.h"
  28 #include "llvm/MC/MCStreamer.h"
  29 #include "llvm/MC/MCSymbol.h"
  30 #include "llvm/Target/TargetLoweringObjectFile.h"
  31 #include "llvm/Target/TargetRegistry.h"
  32 #include "llvm/ADT/Statistic.h"
  33 #include "llvm/ADT/StringExtras.h"
  34 #include "llvm/Support/CommandLine.h"
  35 #include "llvm/Support/ErrorHandling.h"
  36 #include "llvm/Support/FormattedStream.h"
  37 #include "llvm/Support/Mangler.h"
  38 #include "llvm/Support/MathExtras.h"
  39 #include <cctype>
  40 #include <cstring>
  41 #include <map>
  42 using namespace llvm;
  43
  44 STATISTIC(EmittedInsts, "Number of machine instrs printed");
  45
  46 namespace {
  47   class VISIBILITY_HIDDEN SparcAsmPrinter : public AsmPrinter {
  48     /// We name each basic block in a Function with a unique number, so
  49     /// that we can consistently refer to them later. This is cleared
  50     /// at the beginning of each call to runOnMachineFunction().
  51     ///
  52     typedef std::map<const Value *, unsigned> ValueMapTy;
  53     ValueMapTy NumberForBB;
  54     unsigned BBNumber;
  55   public:
  56     explicit SparcAsmPrinter(formatted_raw_ostream &O, TargetMachine &TM,
  57                              const MCAsmInfo *T, bool V)
  58       : AsmPrinter(O, TM, T, V), BBNumber(0) {}
  59
  60     virtual const char *getPassName() const {
  61       return "Sparc Assembly Printer";
  62     }
  63
  64     void PrintGlobalVariable(const GlobalVariable *GVar);
  65     void printOperand(const MachineInstr *MI, int opNum);
  66     void printMemOperand(const MachineInstr *MI, int opNum,
  67                          const char *Modifier = 0);
  68     void printCCOperand(const MachineInstr *MI, int opNum);
  69
  70     void printInstruction(const MachineInstr *MI);  // autogenerated.
  71     static const char *getRegisterName(unsigned RegNo);
  72
  73     bool runOnMachineFunction(MachineFunction &F);
  74     bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
  75                        unsigned AsmVariant, const char *ExtraCode);
  76     bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNo,
  77                              unsigned AsmVariant, const char *ExtraCode);
  78   };
  79 } // end of anonymous namespace
  80
  81 #include "SparcGenAsmWriter.inc"
  82
  83
  84 /// runOnMachineFunction - This uses the printInstruction()
  85 /// method to print assembly for each instruction.
  86 ///
  87 bool SparcAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
  88   this->MF = &MF;
  89
  90   SetupMachineFunction(MF);
  91
  92   // Print out constants referenced by the function
  93   EmitConstantPool(MF.getConstantPool());
  94
  95   // BBNumber is used here so that a given Printer will never give two
  96   // BBs the same name. (If you have a better way, please let me know!)
  97
  98   O << "\n\n";
  99
 100   // Print out the label for the function.
 101   const Function *F = MF.getFunction();
 102   OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(F, Mang, TM));
 103   EmitAlignment(MF.getAlignment(), 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   // Emit pre-function debug information.
 111   DW->BeginFunction(&MF);
 112
 113   // Number each basic block so that we can consistently refer to them
 114   // in PC-relative references.
 115   // FIXME: Why not use the MBB numbers?
 116   NumberForBB.clear();
 117   for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
 118        I != E; ++I) {
 119     NumberForBB[I->getBasicBlock()] = BBNumber++;
 120   }
 121
 122   // Print out code for the function.
 123   for (MachineFunction::const_iterator I = MF.begin(), E = MF.end();
 124        I != E; ++I) {
 125     // Print a label for the basic block.
 126     if (I != MF.begin()) {
 127       EmitBasicBlockStart(I);
 128       O << '\n';
 129     }
 130     for (MachineBasicBlock::const_iterator II = I->begin(), E = I->end();
 131          II != E; ++II) {
 132       // Print the assembly for the instruction.
 133       processDebugLoc(II->getDebugLoc());
 134       printInstruction(II);
 135
 136       if (VerboseAsm && !II->getDebugLoc().isUnknown())
 137         EmitComments(*II);
 138       O << '\n';
 139
 140       ++EmittedInsts;
 141     }
 142   }
 143
 144   // Emit post-function debug information.
 145   DW->EndFunction(&MF);
 146
 147   // We didn't modify anything.
 148   return false;
 149 }
 150
 151 void SparcAsmPrinter::printOperand(const MachineInstr *MI, int opNum) {
 152   const MachineOperand &MO = MI->getOperand (opNum);
 153   const TargetRegisterInfo &RI = *TM.getRegisterInfo();
 154   bool CloseParen = false;
 155   if (MI->getOpcode() == SP::SETHIi && !MO.isReg() && !MO.isImm()) {
 156     O << "%hi(";
 157     CloseParen = true;
 158   } else if ((MI->getOpcode() == SP::ORri || MI->getOpcode() == SP::ADDri) &&
 159              !MO.isReg() && !MO.isImm()) {
 160     O << "%lo(";
 161     CloseParen = true;
 162   }
 163   switch (MO.getType()) {
 164   case MachineOperand::MO_Register:
 165     O << "%" << LowercaseString(getRegisterName(MO.getReg()));
 166     break;
 167
 168   case MachineOperand::MO_Immediate:
 169     O << (int)MO.getImm();
 170     break;
 171   case MachineOperand::MO_MachineBasicBlock:
 172     GetMBBSymbol(MO.getMBB()->getNumber())->print(O, MAI);
 173     return;
 174   case MachineOperand::MO_GlobalAddress:
 175     O << Mang->getMangledName(MO.getGlobal());
 176     break;
 177   case MachineOperand::MO_ExternalSymbol:
 178     O << MO.getSymbolName();
 179     break;
 180   case MachineOperand::MO_ConstantPoolIndex:
 181     O << MAI->getPrivateGlobalPrefix() << "CPI" << getFunctionNumber() << "_"
 182       << MO.getIndex();
 183     break;
 184   default:
 185     llvm_unreachable("<unknown operand type>");
 186   }
 187   if (CloseParen) O << ")";
 188 }
 189
 190 void SparcAsmPrinter::printMemOperand(const MachineInstr *MI, int opNum,
 191                                       const char *Modifier) {
 192   printOperand(MI, opNum);
 193
 194   // If this is an ADD operand, emit it like normal operands.
 195   if (Modifier && !strcmp(Modifier, "arith")) {
 196     O << ", ";
 197     printOperand(MI, opNum+1);
 198     return;
 199   }
 200
 201   if (MI->getOperand(opNum+1).isReg() &&
 202       MI->getOperand(opNum+1).getReg() == SP::G0)
 203     return;   // don't print "+%g0"
 204   if (MI->getOperand(opNum+1).isImm() &&
 205       MI->getOperand(opNum+1).getImm() == 0)
 206     return;   // don't print "+0"
 207
 208   O << "+";
 209   if (MI->getOperand(opNum+1).isGlobal() ||
 210       MI->getOperand(opNum+1).isCPI()) {
 211     O << "%lo(";
 212     printOperand(MI, opNum+1);
 213     O << ")";
 214   } else {
 215     printOperand(MI, opNum+1);
 216   }
 217 }
 218
 219 void SparcAsmPrinter::printCCOperand(const MachineInstr *MI, int opNum) {
 220   int CC = (int)MI->getOperand(opNum).getImm();
 221   O << SPARCCondCodeToString((SPCC::CondCodes)CC);
 222 }
 223
 224 void SparcAsmPrinter::PrintGlobalVariable(const GlobalVariable* GVar) {
 225   const TargetData *TD = TM.getTargetData();
 226
 227   if (!GVar->hasInitializer())
 228     return;  // External global require no code
 229
 230   // Check to see if this is a special global used by LLVM, if so, emit it.
 231   if (EmitSpecialLLVMGlobal(GVar))
 232     return;
 233
 234   O << "\n\n";
 235   std::string name = Mang->getMangledName(GVar);
 236   Constant *C = GVar->getInitializer();
 237   unsigned Size = TD->getTypeAllocSize(C->getType());
 238   unsigned Align = TD->getPreferredAlignment(GVar);
 239
 240   printVisibility(name, GVar->getVisibility());
 241
 242   OutStreamer.SwitchSection(getObjFileLowering().SectionForGlobal(GVar, Mang,
 243                                                                   TM));
 244
 245   if (C->isNullValue() && !GVar->hasSection()) {
 246     if (!GVar->isThreadLocal() &&
 247         (GVar->hasLocalLinkage() || GVar->isWeakForLinker())) {
 248       if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.
 249
 250       if (GVar->hasLocalLinkage())
 251         O << "\t.local " << name << '\n';
 252
 253       O << MAI->getCOMMDirective() << name << ',' << Size;
 254       if (MAI->getCOMMDirectiveTakesAlignment())
 255         O << ',' << (1 << Align);
 256
 257       O << '\n';
 258       return;
 259     }
 260   }
 261
 262   switch (GVar->getLinkage()) {
 263    case GlobalValue::CommonLinkage:
 264    case GlobalValue::LinkOnceAnyLinkage:
 265    case GlobalValue::LinkOnceODRLinkage:
 266    case GlobalValue::WeakAnyLinkage: // FIXME: Verify correct for weak.
 267    case GlobalValue::WeakODRLinkage: // FIXME: Verify correct for weak.
 268     // Nonnull linkonce -> weak
 269     O << "\t.weak " << name << '\n';
 270     break;
 271    case GlobalValue::AppendingLinkage:
 272     // FIXME: appending linkage variables should go into a section of
 273     // their name or something.  For now, just emit them as external.
 274    case GlobalValue::ExternalLinkage:
 275     // If external or appending, declare as a global symbol
 276     O << MAI->getGlobalDirective() << name << '\n';
 277     // FALL THROUGH
 278    case GlobalValue::PrivateLinkage:
 279    case GlobalValue::LinkerPrivateLinkage:
 280    case GlobalValue::InternalLinkage:
 281     break;
 282    case GlobalValue::GhostLinkage:
 283     llvm_unreachable("Should not have any unmaterialized functions!");
 284    case GlobalValue::DLLImportLinkage:
 285     llvm_unreachable("DLLImport linkage is not supported by this target!");
 286    case GlobalValue::DLLExportLinkage:
 287     llvm_unreachable("DLLExport linkage is not supported by this target!");
 288    default:
 289     llvm_unreachable("Unknown linkage type!");
 290   }
 291
 292   EmitAlignment(Align, GVar);
 293
 294   if (MAI->hasDotTypeDotSizeDirective()) {
 295     O << "\t.type " << name << ",#object\n";
 296     O << "\t.size " << name << ',' << Size << '\n';
 297   }
 298
 299   O << name << ":\n";
 300   EmitGlobalConstant(C);
 301 }
 302
 303 /// PrintAsmOperand - Print out an operand for an inline asm expression.
 304 ///
 305 bool SparcAsmPrinter::PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
 306                                       unsigned AsmVariant,
 307                                       const char *ExtraCode) {
 308   if (ExtraCode && ExtraCode[0]) {
 309     if (ExtraCode[1] != 0) return true; // Unknown modifier.
 310
 311     switch (ExtraCode[0]) {
 312     default: return true;  // Unknown modifier.
 313     case 'r':
 314      break;
 315     }
 316   }
 317
 318   printOperand(MI, OpNo);
 319
 320   return false;
 321 }
 322
 323 bool SparcAsmPrinter::PrintAsmMemoryOperand(const MachineInstr *MI,
 324                                             unsigned OpNo,
 325                                             unsigned AsmVariant,
 326                                             const char *ExtraCode) {
 327   if (ExtraCode && ExtraCode[0])
 328     return true;  // Unknown modifier
 329
 330   O << '[';
 331   printMemOperand(MI, OpNo);
 332   O << ']';
 333
 334   return false;
 335 }
 336
 337 // Force static initialization.
 338 extern "C" void LLVMInitializeSparcAsmPrinter() {
 339   RegisterAsmPrinter<SparcAsmPrinter> X(TheSparcTarget);
 340 }