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