lib/Target/MSIL/MSILWriter.cpp

   1 //===-- MSILWriter.cpp - Library for converting LLVM code to MSIL ---------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file was developed by Roman Samoilov and is distributed under
   6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This library converts LLVM code to MSIL code.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "MSILWriter.h"
  15 #include "llvm/CallingConv.h"
  16 #include "llvm/DerivedTypes.h"
  17 #include "llvm/Intrinsics.h"
  18 #include "llvm/IntrinsicInst.h"
  19 #include "llvm/ParameterAttributes.h"
  20 #include "llvm/TypeSymbolTable.h"
  21 #include "llvm/Analysis/ConstantsScanner.h"
  22 #include "llvm/Support/CallSite.h"
  23 #include "llvm/Support/InstVisitor.h"
  24 #include "llvm/Support/MathExtras.h"
  25 #include "llvm/Transforms/Scalar.h"
  26 #include "llvm/ADT/StringExtras.h"
  27
  28 namespace {
  29   // TargetMachine for the MSIL
  30   struct VISIBILITY_HIDDEN MSILTarget : public TargetMachine {
  31     const TargetData DataLayout;       // Calculates type size & alignment
  32
  33     MSILTarget(const Module &M, const std::string &FS)
  34       : DataLayout(&M) {}
  35
  36     virtual bool WantsWholeFile() const { return true; }
  37     virtual bool addPassesToEmitWholeFile(PassManager &PM, std::ostream &Out,
  38                                          CodeGenFileType FileType, bool Fast);
  39
  40     // This class always works, but shouldn't be the default in most cases.
  41     static unsigned getModuleMatchQuality(const Module &M) { return 1; }
  42
  43     virtual const TargetData *getTargetData() const { return &DataLayout; }
  44   };
  45 }
  46
  47
  48 RegisterTarget<MSILTarget> X("msil", "  MSIL backend");
  49
  50 bool MSILModule::runOnModule(Module &M) {
  51   ModulePtr = &M;
  52   TD = &getAnalysis<TargetData>();
  53   bool Changed = false;
  54   // Find named types.
  55   TypeSymbolTable& Table = M.getTypeSymbolTable();
  56   std::set<const Type *> Types = getAnalysis<FindUsedTypes>().getTypes();
  57   for (TypeSymbolTable::iterator I = Table.begin(), E = Table.end(); I!=E; ) {
  58     if (!isa<StructType>(I->second) && !isa<OpaqueType>(I->second))
  59       Table.remove(I++);
  60     else {
  61       std::set<const Type *>::iterator T = Types.find(I->second);
  62       if (T==Types.end())
  63         Table.remove(I++);
  64       else {
  65         Types.erase(T);
  66         ++I;
  67       }
  68     }
  69   }
  70   // Find unnamed types.
  71   unsigned RenameCounter = 0;
  72   for (std::set<const Type *>::const_iterator I = Types.begin(),
  73        E = Types.end(); I!=E; ++I)
  74     if (const StructType *STy = dyn_cast<StructType>(*I)) {
  75       while (ModulePtr->addTypeName("unnamed$"+utostr(RenameCounter), STy))
  76         ++RenameCounter;
  77       Changed = true;
  78     }
  79   // Pointer for FunctionPass.
  80   UsedTypes = &getAnalysis<FindUsedTypes>().getTypes();
  81   return Changed;
  82 }
  83
  84 char MSILModule::ID = 0;
  85 char MSILWriter::ID = 0;
  86
  87 bool MSILWriter::runOnFunction(Function &F) {
  88   if (F.isDeclaration()) return false;
  89   LInfo = &getAnalysis<LoopInfo>();
  90   printFunction(F);
  91   return false;
  92 }
  93
  94
  95 bool MSILWriter::doInitialization(Module &M) {
  96   ModulePtr = &M;
  97   Mang = new Mangler(M);
  98   Out << ".assembly extern mscorlib {}\n";
  99   Out << ".assembly MSIL {}\n\n";
 100   Out << "// External\n";
 101   printExternals();
 102   Out << "// Declarations\n";
 103   printDeclarations(M.getTypeSymbolTable());
 104   Out << "// Definitions\n";
 105   printGlobalVariables();
 106   Out << "// Startup code\n";
 107   printModuleStartup();
 108   return false;
 109 }
 110
 111
 112 bool MSILWriter::doFinalization(Module &M) {
 113   delete Mang;
 114   return false;
 115 }
 116
 117
 118 void MSILWriter::printModuleStartup() {
 119   Out <<
 120   ".method static public int32 $MSIL_Startup() {\n"
 121   "\t.entrypoint\n"
 122   "\t.locals (native int i)\n"
 123   "\t.locals (native int argc)\n"
 124   "\t.locals (native int ptr)\n"
 125   "\t.locals (void* argv)\n"
 126   "\t.locals (string[] args)\n"
 127   "\tcall\tstring[] [mscorlib]System.Environment::GetCommandLineArgs()\n"
 128   "\tdup\n"
 129   "\tstloc\targs\n"
 130   "\tldlen\n"
 131   "\tconv.i4\n"
 132   "\tdup\n"
 133   "\tstloc\targc\n";
 134   printPtrLoad(TD->getPointerSize());
 135   Out <<
 136   "\tmul\n"
 137   "\tlocalloc\n"
 138   "\tstloc\targv\n"
 139   "\tldc.i4.0\n"
 140   "\tstloc\ti\n"
 141   "L_01:\n"
 142   "\tldloc\ti\n"
 143   "\tldloc\targc\n"
 144   "\tceq\n"
 145   "\tbrtrue\tL_02\n"
 146   "\tldloc\targs\n"
 147   "\tldloc\ti\n"
 148   "\tldelem.ref\n"
 149   "\tcall\tnative int [mscorlib]System.Runtime.InteropServices.Marshal::"
 150            "StringToHGlobalAnsi(string)\n"
 151   "\tstloc\tptr\n"
 152   "\tldloc\targv\n"
 153   "\tldloc\ti\n";
 154   printPtrLoad(TD->getPointerSize());
 155   Out <<
 156   "\tmul\n"
 157   "\tadd\n"
 158   "\tldloc\tptr\n"
 159   "\tstind.i\n"
 160   "\tldloc\ti\n"
 161   "\tldc.i4.1\n"
 162   "\tadd\n"
 163   "\tstloc\ti\n"
 164   "\tbr\tL_01\n"
 165   "L_02:\n"
 166   "\tcall void $MSIL_Init()\n";
 167
 168   // Call user 'main' function.
 169   const Function* F = ModulePtr->getFunction("main");
 170   if (!F || F->isDeclaration()) {
 171     Out << "\tldc.i4.0\n\tret\n}\n";
 172     return;
 173   }
 174   bool BadSig = true;;
 175   std::string Args("");
 176   Function::const_arg_iterator Arg1,Arg2;
 177
 178   switch (F->arg_size()) {
 179   case 0:
 180     BadSig = false;
 181     break;
 182   case 1:
 183     Arg1 = F->arg_begin();
 184     if (Arg1->getType()->isInteger()) {
 185       Out << "\tldloc\targc\n";
 186       Args = getTypeName(Arg1->getType());
 187       BadSig = false;
 188     }
 189     break;
 190   case 2:
 191     Arg1 = Arg2 = F->arg_begin(); ++Arg2;
 192     if (Arg1->getType()->isInteger() &&
 193         Arg2->getType()->getTypeID() == Type::PointerTyID) {
 194       Out << "\tldloc\targc\n\tldloc\targv\n";
 195       Args = getTypeName(Arg1->getType())+","+getTypeName(Arg2->getType());
 196       BadSig = false;
 197     }
 198     break;
 199   default:
 200     BadSig = true;
 201   }
 202
 203   bool RetVoid = (F->getReturnType()->getTypeID() == Type::VoidTyID);
 204   if (BadSig || !F->getReturnType()->isInteger() && !RetVoid) {
 205     Out << "\tldc.i4.0\n";
 206   } else {
 207     Out << "\tcall\t" << getTypeName(F->getReturnType()) <<
 208       getConvModopt(F->getCallingConv()) << "main(" << Args << ")\n";
 209     if (RetVoid)
 210       Out << "\tldc.i4.0\n";
 211     else
 212       Out << "\tconv.i4\n";
 213   }
 214   Out << "\tret\n}\n";
 215 }
 216
 217 bool MSILWriter::isZeroValue(const Value* V) {
 218   if (const Constant *C = dyn_cast<Constant>(V))
 219     return C->isNullValue();
 220   return false;
 221 }
 222
 223
 224 std::string MSILWriter::getValueName(const Value* V) {
 225   // Name into the quotes allow control and space characters.
 226   return "'"+Mang->getValueName(V)+"'";
 227 }
 228
 229
 230 std::string MSILWriter::getLabelName(const std::string& Name) {
 231   if (Name.find('.')!=std::string::npos) {
 232     std::string Tmp(Name);
 233     // Replace unaccepable characters in the label name.
 234     for (std::string::iterator I = Tmp.begin(), E = Tmp.end(); I!=E; ++I)
 235       if (*I=='.') *I = '@';
 236     return Tmp;
 237   }
 238   return Name;
 239 }
 240
 241
 242 std::string MSILWriter::getLabelName(const Value* V) {
 243   return getLabelName(Mang->getValueName(V));
 244 }
 245
 246
 247 std::string MSILWriter::getConvModopt(unsigned CallingConvID) {
 248   switch (CallingConvID) {
 249   case CallingConv::C:
 250   case CallingConv::Cold:
 251   case CallingConv::Fast:
 252     return "modopt([mscorlib]System.Runtime.CompilerServices.CallConvCdecl) ";
 253   case CallingConv::X86_FastCall:
 254     return "modopt([mscorlib]System.Runtime.CompilerServices.CallConvFastcall) ";
 255   case CallingConv::X86_StdCall:
 256     return "modopt([mscorlib]System.Runtime.CompilerServices.CallConvStdcall) ";
 257   default:
 258     cerr << "CallingConvID = " << CallingConvID << '\n';
 259     assert(0 && "Unsupported calling convention");
 260   }
 261 }
 262
 263
 264 std::string MSILWriter::getArrayTypeName(Type::TypeID TyID, const Type* Ty) {
 265   std::string Tmp = "";
 266   const Type* ElemTy = Ty;
 267   assert(Ty->getTypeID()==TyID && "Invalid type passed");
 268   // Walk trought array element types.
 269   for (;;) {
 270     // Multidimensional array.
 271     if (ElemTy->getTypeID()==TyID) {
 272       if (const ArrayType* ATy = dyn_cast<ArrayType>(ElemTy))
 273         Tmp += utostr(ATy->getNumElements());
 274       else if (const VectorType* VTy = dyn_cast<VectorType>(ElemTy))
 275         Tmp += utostr(VTy->getNumElements());
 276       ElemTy = cast<SequentialType>(ElemTy)->getElementType();
 277     }
 278     // Base element type found.
 279     if (ElemTy->getTypeID()!=TyID) break;
 280     Tmp += ",";
 281   }
 282   return getTypeName(ElemTy, false, true)+"["+Tmp+"]";
 283 }
 284
 285
 286 std::string MSILWriter::getPrimitiveTypeName(const Type* Ty, bool isSigned) {
 287   unsigned NumBits = 0;
 288   switch (Ty->getTypeID()) {
 289   case Type::VoidTyID:
 290     return "void ";
 291   case Type::IntegerTyID:
 292     NumBits = getBitWidth(Ty);
 293     if(NumBits==1)
 294       return "bool ";
 295     if (!isSigned)
 296       return "unsigned int"+utostr(NumBits)+" ";
 297     return "int"+utostr(NumBits)+" ";
 298   case Type::FloatTyID:
 299     return "float32 ";
 300   case Type::DoubleTyID:
 301     return "float64 ";
 302   default:
 303     cerr << "Type = " << *Ty << '\n';
 304     assert(0 && "Invalid primitive type");
 305   }
 306 }
 307
 308
 309 std::string MSILWriter::getTypeName(const Type* Ty, bool isSigned,
 310                                     bool isNested) {
 311   if (Ty->isPrimitiveType() || Ty->isInteger())
 312     return getPrimitiveTypeName(Ty,isSigned);
 313   // FIXME: "OpaqueType" support
 314   switch (Ty->getTypeID()) {
 315   case Type::PointerTyID:
 316     return "void* ";
 317   case Type::StructTyID:
 318     if (isNested)
 319       return ModulePtr->getTypeName(Ty);
 320     return "valuetype '"+ModulePtr->getTypeName(Ty)+"' ";
 321   case Type::ArrayTyID:
 322     if (isNested)
 323       return getArrayTypeName(Ty->getTypeID(),Ty);
 324     return "valuetype '"+getArrayTypeName(Ty->getTypeID(),Ty)+"' ";
 325   case Type::VectorTyID:
 326     if (isNested)
 327       return getArrayTypeName(Ty->getTypeID(),Ty);
 328     return "valuetype '"+getArrayTypeName(Ty->getTypeID(),Ty)+"' ";
 329   default:
 330     cerr << "Type = " << *Ty << '\n';
 331     assert(0 && "Invalid type in getTypeName()");
 332   }
 333 }
 334
 335
 336 MSILWriter::ValueType MSILWriter::getValueLocation(const Value* V) {
 337   // Function argument
 338   if (isa<Argument>(V))
 339     return ArgumentVT;
 340   // Function
 341   else if (const Function* F = dyn_cast<Function>(V))
 342     return F->hasInternalLinkage() ? InternalVT : GlobalVT;
 343   // Variable
 344   else if (const GlobalVariable* G = dyn_cast<GlobalVariable>(V))
 345     return G->hasInternalLinkage() ? InternalVT : GlobalVT;
 346   // Constant
 347   else if (isa<Constant>(V))
 348     return isa<ConstantExpr>(V) ? ConstExprVT : ConstVT;
 349   // Local variable
 350   return LocalVT;
 351 }
 352
 353
 354 std::string MSILWriter::getTypePostfix(const Type* Ty, bool Expand,
 355                                        bool isSigned) {
 356   unsigned NumBits = 0;
 357   switch (Ty->getTypeID()) {
 358   // Integer constant, expanding for stack operations.
 359   case Type::IntegerTyID:
 360     NumBits = getBitWidth(Ty);
 361     // Expand integer value to "int32" or "int64".
 362     if (Expand) return (NumBits<=32 ? "i4" : "i8");
 363     if (NumBits==1) return "i1";
 364     return (isSigned ? "i" : "u")+utostr(NumBits/8);
 365   // Float constant.
 366   case Type::FloatTyID:
 367     return "r4";
 368   case Type::DoubleTyID:
 369     return "r8";
 370   case Type::PointerTyID:
 371     return "i"+utostr(TD->getTypeSize(Ty));
 372   default:
 373     cerr << "TypeID = " << Ty->getTypeID() << '\n';
 374     assert(0 && "Invalid type in TypeToPostfix()");
 375   }
 376 }
 377
 378
 379 void MSILWriter::printConvToPtr() {
 380   switch (ModulePtr->getPointerSize()) {
 381   case Module::Pointer32:
 382     printSimpleInstruction("conv.u4");
 383     break;
 384   case Module::Pointer64:
 385     printSimpleInstruction("conv.u8");
 386     break;
 387   default:
 388     assert(0 && "Module use not supporting pointer size");
 389   }
 390 }
 391
 392
 393 void MSILWriter::printPtrLoad(uint64_t N) {
 394   switch (ModulePtr->getPointerSize()) {
 395   case Module::Pointer32:
 396     printSimpleInstruction("ldc.i4",utostr(N).c_str());
 397     // FIXME: Need overflow test?
 398     if (!isUInt32(N)) {
 399       cerr << "Value = " << utostr(N) << '\n';
 400       assert(0 && "32-bit pointer overflowed");
 401     }
 402     break;
 403   case Module::Pointer64:
 404     printSimpleInstruction("ldc.i8",utostr(N).c_str());
 405     break;
 406   default:
 407     assert(0 && "Module use not supporting pointer size");
 408   }
 409 }
 410
 411
 412 void MSILWriter::printValuePtrLoad(const Value* V) {
 413   printValueLoad(V);
 414   printConvToPtr();
 415 }
 416
 417
 418 void MSILWriter::printConstLoad(const Constant* C) {
 419   if (const ConstantInt* CInt = dyn_cast<ConstantInt>(C)) {
 420     // Integer constant
 421     Out << "\tldc." << getTypePostfix(C->getType(),true) << '\t';
 422     if (CInt->isMinValue(true))
 423       Out << CInt->getSExtValue();
 424     else
 425       Out << CInt->getZExtValue();
 426   } else if (const ConstantFP* FP = dyn_cast<ConstantFP>(C)) {
 427     // Float constant
 428     uint64_t X;
 429     unsigned Size;
 430     if (FP->getType()->getTypeID()==Type::FloatTyID) {
 431       X = (uint32_t)FP->getValueAPF().convertToAPInt().getZExtValue();
 432       Size = 4;
 433     } else {
 434       X = FP->getValueAPF().convertToAPInt().getZExtValue();
 435       Size = 8;
 436     }
 437     Out << "\tldc.r" << Size << "\t( " << utohexstr(X) << ')';
 438   } else if (isa<UndefValue>(C)) {
 439     // Undefined constant value = NULL.
 440     printPtrLoad(0);
 441   } else {
 442     cerr << "Constant = " << *C << '\n';
 443     assert(0 && "Invalid constant value");
 444   }
 445   Out << '\n';
 446 }
 447
 448
 449 void MSILWriter::printValueLoad(const Value* V) {
 450   MSILWriter::ValueType Location = getValueLocation(V);
 451   switch (Location) {
 452   // Global variable or function address.
 453   case GlobalVT:
 454   case InternalVT:
 455     if (const Function* F = dyn_cast<Function>(V)) {
 456       std::string Name = getConvModopt(F->getCallingConv())+getValueName(F);
 457       printSimpleInstruction("ldftn",
 458         getCallSignature(F->getFunctionType(),NULL,Name).c_str());
 459     } else {
 460       std::string Tmp;
 461       const Type* ElemTy = cast<PointerType>(V->getType())->getElementType();
 462       if (Location==GlobalVT && cast<GlobalVariable>(V)->hasDLLImportLinkage()) {
 463         Tmp = "void* "+getValueName(V);
 464         printSimpleInstruction("ldsfld",Tmp.c_str());
 465       } else {
 466         Tmp = getTypeName(ElemTy)+getValueName(V);
 467         printSimpleInstruction("ldsflda",Tmp.c_str());
 468       }
 469     }
 470     break;
 471   // Function argument.
 472   case ArgumentVT:
 473     printSimpleInstruction("ldarg",getValueName(V).c_str());
 474     break;
 475   // Local function variable.
 476   case LocalVT:
 477     printSimpleInstruction("ldloc",getValueName(V).c_str());
 478     break;
 479   // Constant value.
 480   case ConstVT:
 481     if (isa<ConstantPointerNull>(V))
 482       printPtrLoad(0);
 483     else
 484       printConstLoad(cast<Constant>(V));
 485     break;
 486   // Constant expression.
 487   case ConstExprVT:
 488     printConstantExpr(cast<ConstantExpr>(V));
 489     break;
 490   default:
 491     cerr << "Value = " << *V << '\n';
 492     assert(0 && "Invalid value location");
 493   }
 494 }
 495
 496
 497 void MSILWriter::printValueSave(const Value* V) {
 498   switch (getValueLocation(V)) {
 499   case ArgumentVT:
 500     printSimpleInstruction("starg",getValueName(V).c_str());
 501     break;
 502   case LocalVT:
 503     printSimpleInstruction("stloc",getValueName(V).c_str());
 504     break;
 505   default:
 506     cerr << "Value  = " << *V << '\n';
 507     assert(0 && "Invalid value location");
 508   }
 509 }
 510
 511
 512 void MSILWriter::printBinaryInstruction(const char* Name, const Value* Left,
 513                                         const Value* Right) {
 514   printValueLoad(Left);
 515   printValueLoad(Right);
 516   Out << '\t' << Name << '\n';
 517 }
 518
 519
 520 void MSILWriter::printSimpleInstruction(const char* Inst, const char* Operand) {
 521   if(Operand)
 522     Out << '\t' << Inst << '\t' << Operand << '\n';
 523   else
 524     Out << '\t' << Inst << '\n';
 525 }
 526
 527
 528 void MSILWriter::printPHICopy(const BasicBlock* Src, const BasicBlock* Dst) {
 529   for (BasicBlock::const_iterator I = Dst->begin(), E = Dst->end();
 530        isa<PHINode>(I); ++I) {
 531     const PHINode* Phi = cast<PHINode>(I);
 532     const Value* Val = Phi->getIncomingValueForBlock(Src);
 533     if (isa<UndefValue>(Val)) continue;
 534     printValueLoad(Val);
 535     printValueSave(Phi);
 536   }
 537 }
 538
 539
 540 void MSILWriter::printBranchToBlock(const BasicBlock* CurrBB,
 541                                     const BasicBlock* TrueBB,
 542                                     const BasicBlock* FalseBB) {
 543   if (TrueBB==FalseBB) {
 544     // "TrueBB" and "FalseBB" destination equals
 545     printPHICopy(CurrBB,TrueBB);
 546     printSimpleInstruction("pop");
 547     printSimpleInstruction("br",getLabelName(TrueBB).c_str());
 548   } else if (FalseBB==NULL) {
 549     // If "FalseBB" not used the jump have condition
 550     printPHICopy(CurrBB,TrueBB);
 551     printSimpleInstruction("brtrue",getLabelName(TrueBB).c_str());
 552   } else if (TrueBB==NULL) {
 553     // If "TrueBB" not used the jump is unconditional
 554     printPHICopy(CurrBB,FalseBB);
 555     printSimpleInstruction("br",getLabelName(FalseBB).c_str());
 556   } else {
 557     // Copy PHI instructions for each block
 558     std::string TmpLabel;
 559     // Print PHI instructions for "TrueBB"
 560     if (isa<PHINode>(TrueBB->begin())) {
 561       TmpLabel = getLabelName(TrueBB)+"$phi_"+utostr(getUniqID());
 562       printSimpleInstruction("brtrue",TmpLabel.c_str());
 563     } else {
 564       printSimpleInstruction("brtrue",getLabelName(TrueBB).c_str());
 565     }
 566     // Print PHI instructions for "FalseBB"
 567     if (isa<PHINode>(FalseBB->begin())) {
 568       printPHICopy(CurrBB,FalseBB);
 569       printSimpleInstruction("br",getLabelName(FalseBB).c_str());
 570     } else {
 571       printSimpleInstruction("br",getLabelName(FalseBB).c_str());
 572     }
 573     if (isa<PHINode>(TrueBB->begin())) {
 574       // Handle "TrueBB" PHI Copy
 575       Out << TmpLabel << ":\n";
 576       printPHICopy(CurrBB,TrueBB);
 577       printSimpleInstruction("br",getLabelName(TrueBB).c_str());
 578     }
 579   }
 580 }
 581
 582
 583 void MSILWriter::printBranchInstruction(const BranchInst* Inst) {
 584   if (Inst->isUnconditional()) {
 585     printBranchToBlock(Inst->getParent(),NULL,Inst->getSuccessor(0));
 586   } else {
 587     printValueLoad(Inst->getCondition());
 588     printBranchToBlock(Inst->getParent(),Inst->getSuccessor(0),
 589                        Inst->getSuccessor(1));
 590   }
 591 }
 592
 593
 594 void MSILWriter::printSelectInstruction(const Value* Cond, const Value* VTrue,
 595                                         const Value* VFalse) {
 596   std::string TmpLabel = std::string("select$true_")+utostr(getUniqID());
 597   printValueLoad(VTrue);
 598   printValueLoad(Cond);
 599   printSimpleInstruction("brtrue",TmpLabel.c_str());
 600   printSimpleInstruction("pop");
 601   printValueLoad(VFalse);
 602   Out << TmpLabel << ":\n";
 603 }
 604
 605
 606 void MSILWriter::printIndirectLoad(const Value* V) {
 607   const Type* Ty = V->getType();
 608   printValueLoad(V);
 609   if (const PointerType* P = dyn_cast<PointerType>(Ty))
 610     Ty = P->getElementType();
 611   std::string Tmp = "ldind."+getTypePostfix(Ty, false);
 612   printSimpleInstruction(Tmp.c_str());
 613 }
 614
 615
 616 void MSILWriter::printIndirectSave(const Value* Ptr, const Value* Val) {
 617   printValueLoad(Ptr);
 618   printValueLoad(Val);
 619   printIndirectSave(Val->getType());
 620 }
 621
 622
 623 void MSILWriter::printIndirectSave(const Type* Ty) {
 624   // Instruction need signed postfix for any type.
 625   std::string postfix = getTypePostfix(Ty, false);
 626   if (*postfix.begin()=='u') *postfix.begin() = 'i';
 627   postfix = "stind."+postfix;
 628   printSimpleInstruction(postfix.c_str());
 629 }
 630
 631
 632 void MSILWriter::printCastInstruction(unsigned int Op, const Value* V,
 633                                       const Type* Ty) {
 634   std::string Tmp("");
 635   printValueLoad(V);
 636   switch (Op) {
 637   // Signed
 638   case Instruction::SExt:
 639   case Instruction::SIToFP:
 640   case Instruction::FPToSI:
 641     Tmp = "conv."+getTypePostfix(Ty,false,true);
 642     printSimpleInstruction(Tmp.c_str());
 643     break;
 644   // Unsigned
 645   case Instruction::FPTrunc:
 646   case Instruction::FPExt:
 647   case Instruction::UIToFP:
 648   case Instruction::Trunc:
 649   case Instruction::ZExt:
 650   case Instruction::FPToUI:
 651   case Instruction::PtrToInt:
 652   case Instruction::IntToPtr:
 653     Tmp = "conv."+getTypePostfix(Ty,false);
 654     printSimpleInstruction(Tmp.c_str());
 655     break;
 656   // Do nothing
 657   case Instruction::BitCast:
 658     // FIXME: meaning that ld*/st* instruction do not change data format.
 659     break;
 660   default:
 661     cerr << "Opcode = " << Op << '\n';
 662     assert(0 && "Invalid conversion instruction");
 663   }
 664 }
 665
 666
 667 void MSILWriter::printGepInstruction(const Value* V, gep_type_iterator I,
 668                                      gep_type_iterator E) {
 669   unsigned Size;
 670   // Load address
 671   printValuePtrLoad(V);
 672   // Calculate element offset.
 673   for (; I!=E; ++I){
 674     Size = 0;
 675     const Value* IndexValue = I.getOperand();
 676     if (const StructType* StrucTy = dyn_cast<StructType>(*I)) {
 677       uint64_t FieldIndex = cast<ConstantInt>(IndexValue)->getZExtValue();
 678       // Offset is the sum of all previous structure fields.
 679       for (uint64_t F = 0; F<FieldIndex; ++F)
 680         Size += TD->getTypeSize(StrucTy->getContainedType((unsigned)F));
 681       printPtrLoad(Size);
 682       printSimpleInstruction("add");
 683       continue;
 684     } else if (const SequentialType* SeqTy = dyn_cast<SequentialType>(*I)) {
 685       Size = TD->getTypeSize(SeqTy->getElementType());
 686     } else {
 687       Size = TD->getTypeSize(*I);
 688     }
 689     // Add offset of current element to stack top.
 690     if (!isZeroValue(IndexValue)) {
 691       // Constant optimization.
 692       if (const ConstantInt* C = dyn_cast<ConstantInt>(IndexValue)) {
 693         if (C->getValue().isNegative()) {
 694           printPtrLoad(C->getValue().abs().getZExtValue()*Size);
 695           printSimpleInstruction("sub");
 696           continue;
 697         } else
 698           printPtrLoad(C->getZExtValue()*Size);
 699       } else {
 700         printPtrLoad(Size);
 701         printValuePtrLoad(IndexValue);
 702         printSimpleInstruction("mul");
 703       }
 704       printSimpleInstruction("add");
 705     }
 706   }
 707 }
 708
 709
 710 std::string MSILWriter::getCallSignature(const FunctionType* Ty,
 711                                          const Instruction* Inst,
 712                                          std::string Name) {
 713   std::string Tmp("");
 714   if (Ty->isVarArg()) Tmp += "vararg ";
 715   // Name and return type.
 716   Tmp += getTypeName(Ty->getReturnType())+Name+"(";
 717   // Function argument type list.
 718   unsigned NumParams = Ty->getNumParams();
 719   for (unsigned I = 0; I!=NumParams; ++I) {
 720     if (I!=0) Tmp += ",";
 721     Tmp += getTypeName(Ty->getParamType(I));
 722   }
 723   // CLR needs to know the exact amount of parameters received by vararg
 724   // function, because caller cleans the stack.
 725   if (Ty->isVarArg() && Inst) {
 726     // Origin to function arguments in "CallInst" or "InvokeInst".
 727     unsigned Org = isa<InvokeInst>(Inst) ? 3 : 1;
 728     // Print variable argument types.
 729     unsigned NumOperands = Inst->getNumOperands()-Org;
 730     if (NumParams<NumOperands) {
 731       if (NumParams!=0) Tmp += ", ";
 732       Tmp += "... , ";
 733       for (unsigned J = NumParams; J!=NumOperands; ++J) {
 734         if (J!=NumParams) Tmp += ", ";
 735         Tmp += getTypeName(Inst->getOperand(J+Org)->getType());
 736       }
 737     }
 738   }
 739   return Tmp+")";
 740 }
 741
 742
 743 void MSILWriter::printFunctionCall(const Value* FnVal,
 744                                    const Instruction* Inst) {
 745   // Get function calling convention.
 746   std::string Name = "";
 747   if (const CallInst* Call = dyn_cast<CallInst>(Inst))
 748     Name = getConvModopt(Call->getCallingConv());
 749   else if (const InvokeInst* Invoke = dyn_cast<InvokeInst>(Inst))
 750     Name = getConvModopt(Invoke->getCallingConv());
 751   else {
 752     cerr << "Instruction = " << Inst->getName() << '\n';
 753     assert(0 && "Need \"Invoke\" or \"Call\" instruction only");
 754   }
 755   if (const Function* F = dyn_cast<Function>(FnVal)) {
 756     // Direct call.
 757     Name += getValueName(F);
 758     printSimpleInstruction("call",
 759       getCallSignature(F->getFunctionType(),Inst,Name).c_str());
 760   } else {
 761     // Indirect function call.
 762     const PointerType* PTy = cast<PointerType>(FnVal->getType());
 763     const FunctionType* FTy = cast<FunctionType>(PTy->getElementType());
 764     // Load function address.
 765     printValueLoad(FnVal);
 766     printSimpleInstruction("calli",getCallSignature(FTy,Inst,Name).c_str());
 767   }
 768 }
 769
 770
 771 void MSILWriter::printIntrinsicCall(const IntrinsicInst* Inst) {
 772   std::string Name;
 773   switch (Inst->getIntrinsicID()) {
 774   case Intrinsic::vastart:
 775     Name = getValueName(Inst->getOperand(1));
 776     Name.insert(Name.length()-1,"$valist");
 777     // Obtain the argument handle.
 778     printSimpleInstruction("ldloca",Name.c_str());
 779     printSimpleInstruction("arglist");
 780     printSimpleInstruction("call",
 781       "instance void [mscorlib]System.ArgIterator::.ctor"
 782       "(valuetype [mscorlib]System.RuntimeArgumentHandle)");
 783     // Save as pointer type "void*"
 784     printValueLoad(Inst->getOperand(1));
 785     printSimpleInstruction("ldloca",Name.c_str());
 786     printIndirectSave(PointerType::get(IntegerType::get(8)));
 787     break;
 788   case Intrinsic::vaend:
 789     // Close argument list handle.
 790     printIndirectLoad(Inst->getOperand(1));
 791     printSimpleInstruction("call","instance void [mscorlib]System.ArgIterator::End()");
 792     break;
 793   case Intrinsic::vacopy:
 794     // Copy "ArgIterator" valuetype.
 795     printIndirectLoad(Inst->getOperand(1));
 796     printIndirectLoad(Inst->getOperand(2));
 797     printSimpleInstruction("cpobj","[mscorlib]System.ArgIterator");
 798     break;
 799   default:
 800     cerr << "Intrinsic ID = " << Inst->getIntrinsicID() << '\n';
 801     assert(0 && "Invalid intrinsic function");
 802   }
 803 }
 804
 805
 806 void MSILWriter::printCallInstruction(const Instruction* Inst) {
 807   if (isa<IntrinsicInst>(Inst)) {
 808     // Handle intrinsic function.
 809     printIntrinsicCall(cast<IntrinsicInst>(Inst));
 810   } else {
 811     // Load arguments to stack and call function.
 812     for (int I = 1, E = Inst->getNumOperands(); I!=E; ++I)
 813       printValueLoad(Inst->getOperand(I));
 814     printFunctionCall(Inst->getOperand(0),Inst);
 815   }
 816 }
 817
 818
 819 void MSILWriter::printICmpInstruction(unsigned Predicate, const Value* Left,
 820                                       const Value* Right) {
 821   switch (Predicate) {
 822   case ICmpInst::ICMP_EQ:
 823     printBinaryInstruction("ceq",Left,Right);
 824     break;
 825   case ICmpInst::ICMP_NE:
 826     // Emulate = not neg (Op1 eq Op2)
 827     printBinaryInstruction("ceq",Left,Right);
 828     printSimpleInstruction("neg");
 829     printSimpleInstruction("not");
 830     break;
 831   case ICmpInst::ICMP_ULE:
 832   case ICmpInst::ICMP_SLE:
 833     // Emulate = (Op1 eq Op2) or (Op1 lt Op2)
 834     printBinaryInstruction("ceq",Left,Right);
 835     if (Predicate==ICmpInst::ICMP_ULE)
 836       printBinaryInstruction("clt.un",Left,Right);
 837     else
 838       printBinaryInstruction("clt",Left,Right);
 839     printSimpleInstruction("or");
 840     break;
 841   case ICmpInst::ICMP_UGE:
 842   case ICmpInst::ICMP_SGE:
 843     // Emulate = (Op1 eq Op2) or (Op1 gt Op2)
 844     printBinaryInstruction("ceq",Left,Right);
 845     if (Predicate==ICmpInst::ICMP_UGE)
 846       printBinaryInstruction("cgt.un",Left,Right);
 847     else
 848       printBinaryInstruction("cgt",Left,Right);
 849     printSimpleInstruction("or");
 850     break;
 851   case ICmpInst::ICMP_ULT:
 852     printBinaryInstruction("clt.un",Left,Right);
 853     break;
 854   case ICmpInst::ICMP_SLT:
 855     printBinaryInstruction("clt",Left,Right);
 856     break;
 857   case ICmpInst::ICMP_UGT:
 858     printBinaryInstruction("cgt.un",Left,Right);
 859   case ICmpInst::ICMP_SGT:
 860     printBinaryInstruction("cgt",Left,Right);
 861     break;
 862   default:
 863     cerr << "Predicate = " << Predicate << '\n';
 864     assert(0 && "Invalid icmp predicate");
 865   }
 866 }
 867
 868
 869 void MSILWriter::printFCmpInstruction(unsigned Predicate, const Value* Left,
 870                                       const Value* Right) {
 871   // FIXME: Correct comparison
 872   std::string NanFunc = "bool [mscorlib]System.Double::IsNaN(float64)";
 873   switch (Predicate) {
 874   case FCmpInst::FCMP_UGT:
 875     // X >  Y || llvm_fcmp_uno(X, Y)
 876     printBinaryInstruction("cgt",Left,Right);
 877     printFCmpInstruction(FCmpInst::FCMP_UNO,Left,Right);
 878     printSimpleInstruction("or");
 879     break;
 880   case FCmpInst::FCMP_OGT:
 881     // X >  Y
 882     printBinaryInstruction("cgt",Left,Right);
 883     break;
 884   case FCmpInst::FCMP_UGE:
 885     // X >= Y || llvm_fcmp_uno(X, Y)
 886     printBinaryInstruction("ceq",Left,Right);
 887     printBinaryInstruction("cgt",Left,Right);
 888     printSimpleInstruction("or");
 889     printFCmpInstruction(FCmpInst::FCMP_UNO,Left,Right);
 890     printSimpleInstruction("or");
 891     break;
 892   case FCmpInst::FCMP_OGE:
 893     // X >= Y
 894     printBinaryInstruction("ceq",Left,Right);
 895     printBinaryInstruction("cgt",Left,Right);
 896     printSimpleInstruction("or");
 897     break;
 898   case FCmpInst::FCMP_ULT:
 899     // X <  Y || llvm_fcmp_uno(X, Y)
 900     printBinaryInstruction("clt",Left,Right);
 901     printFCmpInstruction(FCmpInst::FCMP_UNO,Left,Right);
 902     printSimpleInstruction("or");
 903     break;
 904   case FCmpInst::FCMP_OLT:
 905     // X <  Y
 906     printBinaryInstruction("clt",Left,Right);
 907     break;
 908   case FCmpInst::FCMP_ULE:
 909     // X <= Y || llvm_fcmp_uno(X, Y)
 910     printBinaryInstruction("ceq",Left,Right);
 911     printBinaryInstruction("clt",Left,Right);
 912     printSimpleInstruction("or");
 913     printFCmpInstruction(FCmpInst::FCMP_UNO,Left,Right);
 914     printSimpleInstruction("or");
 915     break;
 916   case FCmpInst::FCMP_OLE:
 917     // X <= Y
 918     printBinaryInstruction("ceq",Left,Right);
 919     printBinaryInstruction("clt",Left,Right);
 920     printSimpleInstruction("or");
 921     break;
 922   case FCmpInst::FCMP_UEQ:
 923     // X == Y || llvm_fcmp_uno(X, Y)
 924     printBinaryInstruction("ceq",Left,Right);
 925     printFCmpInstruction(FCmpInst::FCMP_UNO,Left,Right);
 926     printSimpleInstruction("or");
 927     break;
 928   case FCmpInst::FCMP_OEQ:
 929     // X == Y
 930     printBinaryInstruction("ceq",Left,Right);
 931     break;
 932   case FCmpInst::FCMP_UNE:
 933     // X != Y
 934     printBinaryInstruction("ceq",Left,Right);
 935     printSimpleInstruction("neg");
 936     printSimpleInstruction("not");
 937     break;
 938   case FCmpInst::FCMP_ONE:
 939     // X != Y && llvm_fcmp_ord(X, Y)
 940     printBinaryInstruction("ceq",Left,Right);
 941     printSimpleInstruction("not");
 942     break;
 943   case FCmpInst::FCMP_ORD:
 944     // return X == X && Y == Y
 945     printBinaryInstruction("ceq",Left,Left);
 946     printBinaryInstruction("ceq",Right,Right);
 947     printSimpleInstruction("or");
 948     break;
 949   case FCmpInst::FCMP_UNO:
 950     // X != X || Y != Y
 951     printBinaryInstruction("ceq",Left,Left);
 952     printSimpleInstruction("not");
 953     printBinaryInstruction("ceq",Right,Right);
 954     printSimpleInstruction("not");
 955     printSimpleInstruction("or");
 956     break;
 957   default:
 958     assert(0 && "Illegal FCmp predicate");
 959   }
 960 }
 961
 962
 963 void MSILWriter::printInvokeInstruction(const InvokeInst* Inst) {
 964   std::string Label = "leave$normal_"+utostr(getUniqID());
 965   Out << ".try {\n";
 966   // Load arguments
 967   for (int I = 3, E = Inst->getNumOperands(); I!=E; ++I)
 968     printValueLoad(Inst->getOperand(I));
 969   // Print call instruction
 970   printFunctionCall(Inst->getOperand(0),Inst);
 971   // Save function result and leave "try" block
 972   printValueSave(Inst);
 973   printSimpleInstruction("leave",Label.c_str());
 974   Out << "}\n";
 975   Out << "catch [mscorlib]System.Exception {\n";
 976   // Redirect to unwind block
 977   printSimpleInstruction("pop");
 978   printBranchToBlock(Inst->getParent(),NULL,Inst->getUnwindDest());
 979   Out << "}\n" << Label << ":\n";
 980   // Redirect to continue block
 981   printBranchToBlock(Inst->getParent(),NULL,Inst->getNormalDest());
 982 }
 983
 984
 985 void MSILWriter::printSwitchInstruction(const SwitchInst* Inst) {
 986   // FIXME: Emulate with IL "switch" instruction
 987   // Emulate = if () else if () else if () else ...
 988   for (unsigned int I = 1, E = Inst->getNumCases(); I!=E; ++I) {
 989     printValueLoad(Inst->getCondition());
 990     printValueLoad(Inst->getCaseValue(I));
 991     printSimpleInstruction("ceq");
 992     // Condition jump to successor block
 993     printBranchToBlock(Inst->getParent(),Inst->getSuccessor(I),NULL);
 994   }
 995   // Jump to default block
 996   printBranchToBlock(Inst->getParent(),NULL,Inst->getDefaultDest());
 997 }
 998
 999
1000 void MSILWriter::printVAArgInstruction(const VAArgInst* Inst) {
1001   printIndirectLoad(Inst->getOperand(0));
1002   printSimpleInstruction("call",
1003     "instance typedref [mscorlib]System.ArgIterator::GetNextArg()");
1004   printSimpleInstruction("refanyval","void*");
1005   std::string Name = "ldind."+getTypePostfix(PointerType::get(IntegerType::get(8)),false);
1006   printSimpleInstruction(Name.c_str());
1007 }
1008
1009
1010 void MSILWriter::printAllocaInstruction(const AllocaInst* Inst) {
1011   uint64_t Size = TD->getTypeSize(Inst->getAllocatedType());
1012   // Constant optimization.
1013   if (const ConstantInt* CInt = dyn_cast<ConstantInt>(Inst->getOperand(0))) {
1014     printPtrLoad(CInt->getZExtValue()*Size);
1015   } else {
1016     printPtrLoad(Size);
1017     printValueLoad(Inst->getOperand(0));
1018     printSimpleInstruction("mul");
1019   }
1020   printSimpleInstruction("localloc");
1021 }
1022
1023
1024 void MSILWriter::printInstruction(const Instruction* Inst) {
1025   const Value *Left = 0, *Right = 0;
1026   if (Inst->getNumOperands()>=1) Left = Inst->getOperand(0);
1027   if (Inst->getNumOperands()>=2) Right = Inst->getOperand(1);
1028   // Print instruction
1029   // FIXME: "ShuffleVector","ExtractElement","InsertElement" support.
1030   switch (Inst->getOpcode()) {
1031   // Terminator
1032   case Instruction::Ret:
1033     if (Inst->getNumOperands()) {
1034       printValueLoad(Left);
1035       printSimpleInstruction("ret");
1036     } else
1037       printSimpleInstruction("ret");
1038     break;
1039   case Instruction::Br:
1040     printBranchInstruction(cast<BranchInst>(Inst));
1041     break;
1042   // Binary
1043   case Instruction::Add:
1044     printBinaryInstruction("add",Left,Right);
1045     break;
1046   case Instruction::Sub:
1047     printBinaryInstruction("sub",Left,Right);
1048     break;
1049   case Instruction::Mul:
1050     printBinaryInstruction("mul",Left,Right);
1051     break;
1052   case Instruction::UDiv:
1053     printBinaryInstruction("div.un",Left,Right);
1054     break;
1055   case Instruction::SDiv:
1056   case Instruction::FDiv:
1057     printBinaryInstruction("div",Left,Right);
1058     break;
1059   case Instruction::URem:
1060     printBinaryInstruction("rem.un",Left,Right);
1061     break;
1062   case Instruction::SRem:
1063   case Instruction::FRem:
1064     printBinaryInstruction("rem",Left,Right);
1065     break;
1066   // Binary Condition
1067   case Instruction::ICmp:
1068     printICmpInstruction(cast<ICmpInst>(Inst)->getPredicate(),Left,Right);
1069     break;
1070   case Instruction::FCmp:
1071     printFCmpInstruction(cast<FCmpInst>(Inst)->getPredicate(),Left,Right);
1072     break;
1073   // Bitwise Binary
1074   case Instruction::And:
1075     printBinaryInstruction("and",Left,Right);
1076     break;
1077   case Instruction::Or:
1078     printBinaryInstruction("or",Left,Right);
1079     break;
1080   case Instruction::Xor:
1081     printBinaryInstruction("xor",Left,Right);
1082     break;
1083   case Instruction::Shl:
1084     printValueLoad(Left);
1085     printValueLoad(Right);
1086     printSimpleInstruction("conv.i4");
1087     printSimpleInstruction("shl");
1088     break;
1089   case Instruction::LShr:
1090     printValueLoad(Left);
1091     printValueLoad(Right);
1092     printSimpleInstruction("conv.i4");
1093     printSimpleInstruction("shr.un");
1094     break;
1095   case Instruction::AShr:
1096     printValueLoad(Left);
1097     printValueLoad(Right);
1098     printSimpleInstruction("conv.i4");
1099     printSimpleInstruction("shr");
1100     break;
1101   case Instruction::Select:
1102     printSelectInstruction(Inst->getOperand(0),Inst->getOperand(1),Inst->getOperand(2));
1103     break;
1104   case Instruction::Load:
1105     printIndirectLoad(Inst->getOperand(0));
1106     break;
1107   case Instruction::Store:
1108     printIndirectSave(Inst->getOperand(1), Inst->getOperand(0));
1109     break;
1110   case Instruction::Trunc:
1111   case Instruction::ZExt:
1112   case Instruction::SExt:
1113   case Instruction::FPTrunc:
1114   case Instruction::FPExt:
1115   case Instruction::UIToFP:
1116   case Instruction::SIToFP:
1117   case Instruction::FPToUI:
1118   case Instruction::FPToSI:
1119   case Instruction::PtrToInt:
1120   case Instruction::IntToPtr:
1121   case Instruction::BitCast:
1122     printCastInstruction(Inst->getOpcode(),Left,
1123                          cast<CastInst>(Inst)->getDestTy());
1124     break;
1125   case Instruction::GetElementPtr:
1126     printGepInstruction(Inst->getOperand(0),gep_type_begin(Inst),
1127                         gep_type_end(Inst));
1128     break;
1129   case Instruction::Call:
1130     printCallInstruction(cast<CallInst>(Inst));
1131     break;
1132   case Instruction::Invoke:
1133     printInvokeInstruction(cast<InvokeInst>(Inst));
1134     break;
1135   case Instruction::Unwind:
1136     printSimpleInstruction("newobj",
1137       "instance void [mscorlib]System.Exception::.ctor()");
1138     printSimpleInstruction("throw");
1139     break;
1140   case Instruction::Switch:
1141     printSwitchInstruction(cast<SwitchInst>(Inst));
1142     break;
1143   case Instruction::Alloca:
1144     printAllocaInstruction(cast<AllocaInst>(Inst));
1145     break;
1146   case Instruction::Malloc:
1147     assert(0 && "LowerAllocationsPass used");
1148     break;
1149   case Instruction::Free:
1150     assert(0 && "LowerAllocationsPass used");
1151     break;
1152   case Instruction::Unreachable:
1153     printSimpleInstruction("ldstr", "\"Unreachable instruction\"");
1154     printSimpleInstruction("newobj",
1155       "instance void [mscorlib]System.Exception::.ctor(string)");
1156     printSimpleInstruction("throw");
1157     break;
1158   case Instruction::VAArg:
1159     printVAArgInstruction(cast<VAArgInst>(Inst));
1160     break;
1161   default:
1162     cerr << "Instruction = " << Inst->getName() << '\n';
1163     assert(0 && "Unsupported instruction");
1164   }
1165 }
1166
1167
1168 void MSILWriter::printLoop(const Loop* L) {
1169   Out << getLabelName(L->getHeader()->getName()) << ":\n";
1170   const std::vector<BasicBlock*>& blocks = L->getBlocks();
1171   for (unsigned I = 0, E = blocks.size(); I!=E; I++) {
1172     BasicBlock* BB = blocks[I];
1173     Loop* BBLoop = LInfo->getLoopFor(BB);
1174     if (BBLoop == L)
1175       printBasicBlock(BB);
1176     else if (BB==BBLoop->getHeader() && BBLoop->getParentLoop()==L)
1177       printLoop(BBLoop);
1178   }
1179   printSimpleInstruction("br",getLabelName(L->getHeader()->getName()).c_str());
1180 }
1181
1182
1183 void MSILWriter::printBasicBlock(const BasicBlock* BB) {
1184   Out << getLabelName(BB) << ":\n";
1185   for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I!=E; ++I) {
1186     const Instruction* Inst = I;
1187     // Comment llvm original instruction
1188     Out << "\n//" << *Inst << "\n";
1189     // Do not handle PHI instruction in current block
1190     if (Inst->getOpcode()==Instruction::PHI) continue;
1191     // Print instruction
1192     printInstruction(Inst);
1193     // Save result
1194     if (Inst->getType()!=Type::VoidTy) {
1195       // Do not save value after invoke, it done in "try" block
1196       if (Inst->getOpcode()==Instruction::Invoke) continue;
1197       printValueSave(Inst);
1198     }
1199   }
1200 }
1201
1202
1203 void MSILWriter::printLocalVariables(const Function& F) {
1204   std::string Name;
1205   const Type* Ty = NULL;
1206   std::set<const Value*> Printed;
1207   const Value* VaList = NULL;
1208   unsigned StackDepth = 8;
1209   // Find local variables
1210   for (const_inst_iterator I = inst_begin(&F), E = inst_end(&F); I!=E; ++I) {
1211     if (I->getOpcode()==Instruction::Call ||
1212         I->getOpcode()==Instruction::Invoke) {
1213       // Test stack depth.
1214       if (StackDepth<I->getNumOperands())
1215         StackDepth = I->getNumOperands();
1216     }
1217     const AllocaInst* AI = dyn_cast<AllocaInst>(&*I);
1218     if (AI && !isa<GlobalVariable>(AI)) {
1219       // Local variable allocation.
1220       Ty = PointerType::get(AI->getAllocatedType());
1221       Name = getValueName(AI);
1222       Out << "\t.locals (" << getTypeName(Ty) << Name << ")\n";
1223     } else if (I->getType()!=Type::VoidTy) {
1224       // Operation result.
1225       Ty = I->getType();
1226       Name = getValueName(&*I);
1227       Out << "\t.locals (" << getTypeName(Ty) << Name << ")\n";
1228     }
1229     // Test on 'va_list' variable
1230     bool isVaList = false;
1231     if (const VAArgInst* VaInst = dyn_cast<VAArgInst>(&*I)) {
1232       // "va_list" as "va_arg" instruction operand.
1233       isVaList = true;
1234       VaList = VaInst->getOperand(0);
1235     } else if (const IntrinsicInst* Inst = dyn_cast<IntrinsicInst>(&*I)) {
1236       // "va_list" as intrinsic function operand.
1237       switch (Inst->getIntrinsicID()) {
1238       case Intrinsic::vastart:
1239       case Intrinsic::vaend:
1240       case Intrinsic::vacopy:
1241         isVaList = true;
1242         VaList = Inst->getOperand(1);
1243         break;
1244       default:
1245         isVaList = false;
1246       }
1247     }
1248     // Print "va_list" variable.
1249     if (isVaList && Printed.insert(VaList).second) {
1250       Name = getValueName(VaList);
1251       Name.insert(Name.length()-1,"$valist");
1252       Out << "\t.locals (valuetype [mscorlib]System.ArgIterator "
1253           << Name << ")\n";
1254     }
1255   }
1256   printSimpleInstruction(".maxstack",utostr(StackDepth*2).c_str());
1257 }
1258
1259
1260 void MSILWriter::printFunctionBody(const Function& F) {
1261   // Print body
1262   for (Function::const_iterator I = F.begin(), E = F.end(); I!=E; ++I) {
1263     if (Loop *L = LInfo->getLoopFor(I)) {
1264       if (L->getHeader()==I && L->getParentLoop()==0)
1265         printLoop(L);
1266     } else {
1267       printBasicBlock(I);
1268     }
1269   }
1270 }
1271
1272
1273 void MSILWriter::printConstantExpr(const ConstantExpr* CE) {
1274   const Value *left = 0, *right = 0;
1275   if (CE->getNumOperands()>=1) left = CE->getOperand(0);
1276   if (CE->getNumOperands()>=2) right = CE->getOperand(1);
1277   // Print instruction
1278   switch (CE->getOpcode()) {
1279   case Instruction::Trunc:
1280   case Instruction::ZExt:
1281   case Instruction::SExt:
1282   case Instruction::FPTrunc:
1283   case Instruction::FPExt:
1284   case Instruction::UIToFP:
1285   case Instruction::SIToFP:
1286   case Instruction::FPToUI:
1287   case Instruction::FPToSI:
1288   case Instruction::PtrToInt:
1289   case Instruction::IntToPtr:
1290   case Instruction::BitCast:
1291     printCastInstruction(CE->getOpcode(),left,CE->getType());
1292     break;
1293   case Instruction::GetElementPtr:
1294     printGepInstruction(CE->getOperand(0),gep_type_begin(CE),gep_type_end(CE));
1295     break;
1296   case Instruction::ICmp:
1297     printICmpInstruction(CE->getPredicate(),left,right);
1298     break;
1299   case Instruction::FCmp:
1300     printFCmpInstruction(CE->getPredicate(),left,right);
1301     break;
1302   case Instruction::Select:
1303     printSelectInstruction(CE->getOperand(0),CE->getOperand(1),CE->getOperand(2));
1304     break;
1305   case Instruction::Add:
1306     printBinaryInstruction("add",left,right);
1307     break;
1308   case Instruction::Sub:
1309     printBinaryInstruction("sub",left,right);
1310     break;
1311   case Instruction::Mul:
1312     printBinaryInstruction("mul",left,right);
1313     break;
1314   case Instruction::UDiv:
1315     printBinaryInstruction("div.un",left,right);
1316     break;
1317   case Instruction::SDiv:
1318   case Instruction::FDiv:
1319     printBinaryInstruction("div",left,right);
1320     break;
1321   case Instruction::URem:
1322     printBinaryInstruction("rem.un",left,right);
1323     break;
1324   case Instruction::SRem:
1325   case Instruction::FRem:
1326     printBinaryInstruction("rem",left,right);
1327     break;
1328   case Instruction::And:
1329     printBinaryInstruction("and",left,right);
1330     break;
1331   case Instruction::Or:
1332     printBinaryInstruction("or",left,right);
1333     break;
1334   case Instruction::Xor:
1335     printBinaryInstruction("xor",left,right);
1336     break;
1337   case Instruction::Shl:
1338     printBinaryInstruction("shl",left,right);
1339     break;
1340   case Instruction::LShr:
1341     printBinaryInstruction("shr.un",left,right);
1342     break;
1343   case Instruction::AShr:
1344     printBinaryInstruction("shr",left,right);
1345     break;
1346   default:
1347     cerr << "Expression = " << *CE << "\n";
1348     assert(0 && "Invalid constant expression");
1349   }
1350 }
1351
1352
1353 void MSILWriter::printStaticInitializerList() {
1354   // List of global variables with uninitialized fields.
1355   for (std::map<const GlobalVariable*,std::vector<StaticInitializer> >::iterator
1356        VarI = StaticInitList.begin(), VarE = StaticInitList.end(); VarI!=VarE;
1357        ++VarI) {
1358     const std::vector<StaticInitializer>& InitList = VarI->second;
1359     if (InitList.empty()) continue;
1360     // For each uninitialized field.
1361     for (std::vector<StaticInitializer>::const_iterator I = InitList.begin(),
1362          E = InitList.end(); I!=E; ++I) {
1363       if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(I->constant)) {
1364         Out << "\n// Init " << getValueName(VarI->first) << ", offset " <<
1365           utostr(I->offset) << ", type "<< *I->constant->getType() << "\n\n";
1366         // Load variable address
1367         printValueLoad(VarI->first);
1368         // Add offset
1369         if (I->offset!=0) {
1370           printPtrLoad(I->offset);
1371           printSimpleInstruction("add");
1372         }
1373         // Load value
1374         printConstantExpr(CE);
1375         // Save result at offset
1376         std::string postfix = getTypePostfix(CE->getType(),true);
1377         if (*postfix.begin()=='u') *postfix.begin() = 'i';
1378         postfix = "stind."+postfix;
1379         printSimpleInstruction(postfix.c_str());
1380       } else {
1381         cerr << "Constant = " << *I->constant << '\n';
1382         assert(0 && "Invalid static initializer");
1383       }
1384     }
1385   }
1386 }
1387
1388
1389 void MSILWriter::printFunction(const Function& F) {
1390   const FunctionType* FTy = F.getFunctionType();
1391   const ParamAttrsList *Attrs = FTy->getParamAttrs();
1392   bool isSigned = Attrs && Attrs->paramHasAttr(0, ParamAttr::SExt);
1393   Out << "\n.method static ";
1394   Out << (F.hasInternalLinkage() ? "private " : "public ");
1395   if (F.isVarArg()) Out << "vararg ";
1396   Out << getTypeName(F.getReturnType(),isSigned) <<
1397     getConvModopt(F.getCallingConv()) << getValueName(&F) << '\n';
1398   // Arguments
1399   Out << "\t(";
1400   unsigned ArgIdx = 1;
1401   for (Function::const_arg_iterator I = F.arg_begin(), E = F.arg_end(); I!=E;
1402        ++I, ++ArgIdx) {
1403     isSigned = Attrs && Attrs->paramHasAttr(ArgIdx, ParamAttr::SExt);
1404     if (I!=F.arg_begin()) Out << ", ";
1405     Out << getTypeName(I->getType(),isSigned) << getValueName(I);
1406   }
1407   Out << ") cil managed\n";
1408   // Body
1409   Out << "{\n";
1410   printLocalVariables(F);
1411   printFunctionBody(F);
1412   Out << "}\n";
1413 }
1414
1415
1416 void MSILWriter::printDeclarations(const TypeSymbolTable& ST) {
1417   std::string Name;
1418   std::set<const Type*> Printed;
1419   for (std::set<const Type*>::const_iterator
1420        UI = UsedTypes->begin(), UE = UsedTypes->end(); UI!=UE; ++UI) {
1421     const Type* Ty = *UI;
1422     if (isa<ArrayType>(Ty) || isa<VectorType>(Ty) || isa<StructType>(Ty))
1423       Name = getTypeName(Ty, false, true);
1424     // Type with no need to declare.
1425     else continue;
1426     // Print not duplicated type
1427     if (Printed.insert(Ty).second) {
1428       Out << ".class value explicit ansi sealed '" << Name << "'";
1429       Out << " { .pack " << 1 << " .size " << TD->getTypeSize(Ty) << " }\n\n";
1430     }
1431   }
1432 }
1433
1434
1435 unsigned int MSILWriter::getBitWidth(const Type* Ty) {
1436   unsigned int N = Ty->getPrimitiveSizeInBits();
1437   assert(N!=0 && "Invalid type in getBitWidth()");
1438   switch (N) {
1439   case 1:
1440   case 8:
1441   case 16:
1442   case 32:
1443   case 64:
1444     return N;
1445   default:
1446     cerr << "Bits = " << N << '\n';
1447     assert(0 && "Unsupported integer width");
1448   }
1449 }
1450
1451
1452 void MSILWriter::printStaticConstant(const Constant* C, uint64_t& Offset) {
1453   uint64_t TySize = 0;
1454   const Type* Ty = C->getType();
1455   // Print zero initialized constant.
1456   if (isa<ConstantAggregateZero>(C) || C->isNullValue()) {
1457     TySize = TD->getTypeSize(C->getType());
1458     Offset += TySize;
1459     Out << "int8 (0) [" << TySize << "]";
1460     return;
1461   }
1462   // Print constant initializer
1463   switch (Ty->getTypeID()) {
1464   case Type::IntegerTyID: {
1465     TySize = TD->getTypeSize(Ty);
1466     const ConstantInt* Int = cast<ConstantInt>(C);
1467     Out << getPrimitiveTypeName(Ty,true) << "(" << Int->getSExtValue() << ")";
1468     break;
1469   }
1470   case Type::FloatTyID:
1471   case Type::DoubleTyID: {
1472     TySize = TD->getTypeSize(Ty);
1473     const ConstantFP* FP = cast<ConstantFP>(C);
1474     if (Ty->getTypeID() == Type::FloatTyID)
1475       Out << "int32 (" <<
1476         (uint32_t)FP->getValueAPF().convertToAPInt().getZExtValue() << ')';
1477     else
1478       Out << "int64 (" <<
1479         FP->getValueAPF().convertToAPInt().getZExtValue() << ')';
1480     break;
1481   }
1482   case Type::ArrayTyID:
1483   case Type::VectorTyID:
1484   case Type::StructTyID:
1485     for (unsigned I = 0, E = C->getNumOperands(); I<E; I++) {
1486       if (I!=0) Out << ",\n";
1487       printStaticConstant(C->getOperand(I),Offset);
1488     }
1489     break;
1490   case Type::PointerTyID:
1491     TySize = TD->getTypeSize(C->getType());
1492     // Initialize with global variable address
1493     if (const GlobalVariable *G = dyn_cast<GlobalVariable>(C)) {
1494       std::string name = getValueName(G);
1495       Out << "&(" << name.insert(name.length()-1,"$data") << ")";
1496     } else {
1497       // Dynamic initialization
1498       if (!isa<ConstantPointerNull>(C) && !C->isNullValue())
1499         InitListPtr->push_back(StaticInitializer(C,Offset));
1500       // Null pointer initialization
1501       if (TySize==4) Out << "int32 (0)";
1502       else if (TySize==8) Out << "int64 (0)";
1503       else assert(0 && "Invalid pointer size");
1504     }
1505     break;
1506   default:
1507     cerr << "TypeID = " << Ty->getTypeID() << '\n';
1508     assert(0 && "Invalid type in printStaticConstant()");
1509   }
1510   // Increase offset.
1511   Offset += TySize;
1512 }
1513
1514
1515 void MSILWriter::printStaticInitializer(const Constant* C,
1516                                         const std::string& Name) {
1517   switch (C->getType()->getTypeID()) {
1518   case Type::IntegerTyID:
1519   case Type::FloatTyID:
1520   case Type::DoubleTyID:
1521     Out << getPrimitiveTypeName(C->getType(), false);
1522     break;
1523   case Type::ArrayTyID:
1524   case Type::VectorTyID:
1525   case Type::StructTyID:
1526   case Type::PointerTyID:
1527     Out << getTypeName(C->getType());
1528     break;
1529   default:
1530     cerr << "Type = " << *C << "\n";
1531     assert(0 && "Invalid constant type");
1532   }
1533   // Print initializer
1534   std::string label = Name;
1535   label.insert(label.length()-1,"$data");
1536   Out << Name << " at " << label << '\n';
1537   Out << ".data " << label << " = {\n";
1538   uint64_t offset = 0;
1539   printStaticConstant(C,offset);
1540   Out << "\n}\n\n";
1541 }
1542
1543
1544 void MSILWriter::printVariableDefinition(const GlobalVariable* G) {
1545   const Constant* C = G->getInitializer();
1546   if (C->isNullValue() || isa<ConstantAggregateZero>(C) || isa<UndefValue>(C))
1547     InitListPtr = 0;
1548   else
1549     InitListPtr = &StaticInitList[G];
1550   printStaticInitializer(C,getValueName(G));
1551 }
1552
1553
1554 void MSILWriter::printGlobalVariables() {
1555   if (ModulePtr->global_empty()) return;
1556   Module::global_iterator I,E;
1557   for (I = ModulePtr->global_begin(), E = ModulePtr->global_end(); I!=E; ++I) {
1558     // Variable definition
1559     Out << ".field static " << (I->isDeclaration() ? "public " :
1560                                                      "private ");
1561     if (I->isDeclaration()) {
1562       Out << getTypeName(I->getType()) << getValueName(&*I) << "\n\n";
1563     } else
1564       printVariableDefinition(&*I);
1565   }
1566 }
1567
1568
1569 const char* MSILWriter::getLibraryName(const Function* F) {
1570   return getLibraryForSymbol(F->getName().c_str(), true, F->getCallingConv());
1571 }
1572
1573
1574 const char* MSILWriter::getLibraryName(const GlobalVariable* GV) {
1575   return getLibraryForSymbol(Mang->getValueName(GV).c_str(), false, 0);
1576 }
1577
1578
1579 const char* MSILWriter::getLibraryForSymbol(const char* Name, bool isFunction,
1580                                            unsigned CallingConv) {
1581   // TODO: Read *.def file with function and libraries definitions.
1582   return "MSVCRT.DLL";
1583 }
1584
1585
1586 void MSILWriter::printExternals() {
1587   Module::const_iterator I,E;
1588   // Functions.
1589   for (I=ModulePtr->begin(),E=ModulePtr->end(); I!=E; ++I) {
1590     // Skip intrisics
1591     if (I->getIntrinsicID()) continue;
1592     if (I->isDeclaration()) {
1593       const Function* F = I;
1594       std::string Name = getConvModopt(F->getCallingConv())+getValueName(F);
1595       std::string Sig =
1596         getCallSignature(cast<FunctionType>(F->getFunctionType()), NULL, Name);
1597       Out << ".method static hidebysig pinvokeimpl(\""
1598           << getLibraryName(F) << "\")\n\t" << Sig << " preservesig {}\n\n";
1599     }
1600   }
1601   // External variables and static initialization.
1602   Out <<
1603   ".method public hidebysig static pinvokeimpl(\"KERNEL32.DLL\" ansi winapi)"
1604   "  native int LoadLibrary(string) preservesig {}\n"
1605   ".method public hidebysig static pinvokeimpl(\"KERNEL32.DLL\" ansi winapi)"
1606   "  native int GetProcAddress(native int, string) preservesig {}\n";
1607   Out <<
1608   ".method private static void* $MSIL_Import(string lib,string sym)\n"
1609   " managed cil\n{\n"
1610   "\tldarg\tlib\n"
1611   "\tcall\tnative int LoadLibrary(string)\n"
1612   "\tldarg\tsym\n"
1613   "\tcall\tnative int GetProcAddress(native int,string)\n"
1614   "\tdup\n"
1615   "\tbrtrue\tL_01\n"
1616   "\tldstr\t\"Can no import variable\"\n"
1617   "\tnewobj\tinstance void [mscorlib]System.Exception::.ctor(string)\n"
1618   "\tthrow\n"
1619   "L_01:\n"
1620   "\tret\n"
1621   "}\n\n"
1622   ".method static private void $MSIL_Init() managed cil\n{\n";
1623   printStaticInitializerList();
1624   // Foreach global variable.
1625   for (Module::global_iterator I = ModulePtr->global_begin(),
1626        E = ModulePtr->global_end(); I!=E; ++I) {
1627     if (!I->isDeclaration() || !I->hasDLLImportLinkage()) continue;
1628     // Use "LoadLibrary"/"GetProcAddress" to recive variable address.
1629     std::string Label = "not_null$_"+utostr(getUniqID());
1630     std::string Tmp = getTypeName(I->getType())+getValueName(&*I);
1631     printSimpleInstruction("ldsflda",Tmp.c_str());
1632     Out << "\tldstr\t\"" << getLibraryName(&*I) << "\"\n";
1633     Out << "\tldstr\t\"" << Mang->getValueName(&*I) << "\"\n";
1634     printSimpleInstruction("call","void* $MSIL_Import(string,string)");
1635     printIndirectSave(I->getType());
1636   }
1637   printSimpleInstruction("ret");
1638   Out << "}\n\n";
1639 }
1640
1641
1642 //===----------------------------------------------------------------------===//
1643 //                       External Interface declaration
1644 //===----------------------------------------------------------------------===//
1645
1646 bool MSILTarget::addPassesToEmitWholeFile(PassManager &PM, std::ostream &o,
1647                                           CodeGenFileType FileType, bool Fast)
1648 {
1649   if (FileType != TargetMachine::AssemblyFile) return true;
1650   MSILWriter* Writer = new MSILWriter(o);
1651   PM.add(createLowerGCPass());
1652   PM.add(createLowerAllocationsPass(true));
1653   // FIXME: Handle switch trougth native IL instruction "switch"
1654   PM.add(createLowerSwitchPass());
1655   PM.add(createCFGSimplificationPass());
1656   PM.add(new MSILModule(Writer->UsedTypes,Writer->TD));
1657   PM.add(Writer);
1658   return false;
1659 }