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 is distributed under the University of Illinois Open Source
   6 // 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/TypeSymbolTable.h"
  20 #include "llvm/Analysis/ConstantsScanner.h"
  21 #include "llvm/Support/CallSite.h"
  22 #include "llvm/Support/InstVisitor.h"
  23 #include "llvm/Support/MathExtras.h"
  24 #include "llvm/Transforms/Scalar.h"
  25 #include "llvm/ADT/StringExtras.h"
  26 #include "llvm/CodeGen/Passes.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, raw_ostream &Out,
  38                                           CodeGenFileType FileType,
  39                                           CodeGenOpt::Level OptLevel);
  40
  41     // This class always works, but shouldn't be the default in most cases.
  42     static unsigned getModuleMatchQuality(const Module &M) { return 1; }
  43
  44     virtual const TargetData *getTargetData() const { return &DataLayout; }
  45   };
  46 }
  47
  48 /// MSILTargetMachineModule - Note that this is used on hosts that
  49 /// cannot link in a library unless there are references into the
  50 /// library.  In particular, it seems that it is not possible to get
  51 /// things to work on Win32 without this.  Though it is unused, do not
  52 /// remove it.
  53 extern "C" int MSILTargetMachineModule;
  54 int MSILTargetMachineModule = 0;
  55
  56 static RegisterTarget<MSILTarget> X("msil", "MSIL backend");
  57
  58 bool MSILModule::runOnModule(Module &M) {
  59   ModulePtr = &M;
  60   TD = &getAnalysis<TargetData>();
  61   bool Changed = false;
  62   // Find named types.
  63   TypeSymbolTable& Table = M.getTypeSymbolTable();
  64   std::set<const Type *> Types = getAnalysis<FindUsedTypes>().getTypes();
  65   for (TypeSymbolTable::iterator I = Table.begin(), E = Table.end(); I!=E; ) {
  66     if (!isa<StructType>(I->second) && !isa<OpaqueType>(I->second))
  67       Table.remove(I++);
  68     else {
  69       std::set<const Type *>::iterator T = Types.find(I->second);
  70       if (T==Types.end())
  71         Table.remove(I++);
  72       else {
  73         Types.erase(T);
  74         ++I;
  75       }
  76     }
  77   }
  78   // Find unnamed types.
  79   unsigned RenameCounter = 0;
  80   for (std::set<const Type *>::const_iterator I = Types.begin(),
  81        E = Types.end(); I!=E; ++I)
  82     if (const StructType *STy = dyn_cast<StructType>(*I)) {
  83       while (ModulePtr->addTypeName("unnamed$"+utostr(RenameCounter), STy))
  84         ++RenameCounter;
  85       Changed = true;
  86     }
  87   // Pointer for FunctionPass.
  88   UsedTypes = &getAnalysis<FindUsedTypes>().getTypes();
  89   return Changed;
  90 }
  91
  92 char MSILModule::ID = 0;
  93 char MSILWriter::ID = 0;
  94
  95 bool MSILWriter::runOnFunction(Function &F) {
  96   if (F.isDeclaration()) return false;
  97
  98   // Do not codegen any 'available_externally' functions at all, they have
  99   // definitions outside the translation unit.
 100   if (F.hasAvailableExternallyLinkage())
 101     return false;
 102
 103   LInfo = &getAnalysis<LoopInfo>();
 104   printFunction(F);
 105   return false;
 106 }
 107
 108
 109 bool MSILWriter::doInitialization(Module &M) {
 110   ModulePtr = &M;
 111   Mang = new Mangler(M);
 112   Out << ".assembly extern mscorlib {}\n";
 113   Out << ".assembly MSIL {}\n\n";
 114   Out << "// External\n";
 115   printExternals();
 116   Out << "// Declarations\n";
 117   printDeclarations(M.getTypeSymbolTable());
 118   Out << "// Definitions\n";
 119   printGlobalVariables();
 120   Out << "// Startup code\n";
 121   printModuleStartup();
 122   return false;
 123 }
 124
 125
 126 bool MSILWriter::doFinalization(Module &M) {
 127   delete Mang;
 128   return false;
 129 }
 130
 131
 132 void MSILWriter::printModuleStartup() {
 133   Out <<
 134   ".method static public int32 $MSIL_Startup() {\n"
 135   "\t.entrypoint\n"
 136   "\t.locals (native int i)\n"
 137   "\t.locals (native int argc)\n"
 138   "\t.locals (native int ptr)\n"
 139   "\t.locals (void* argv)\n"
 140   "\t.locals (string[] args)\n"
 141   "\tcall\tstring[] [mscorlib]System.Environment::GetCommandLineArgs()\n"
 142   "\tdup\n"
 143   "\tstloc\targs\n"
 144   "\tldlen\n"
 145   "\tconv.i4\n"
 146   "\tdup\n"
 147   "\tstloc\targc\n";
 148   printPtrLoad(TD->getPointerSize());
 149   Out <<
 150   "\tmul\n"
 151   "\tlocalloc\n"
 152   "\tstloc\targv\n"
 153   "\tldc.i4.0\n"
 154   "\tstloc\ti\n"
 155   "L_01:\n"
 156   "\tldloc\ti\n"
 157   "\tldloc\targc\n"
 158   "\tceq\n"
 159   "\tbrtrue\tL_02\n"
 160   "\tldloc\targs\n"
 161   "\tldloc\ti\n"
 162   "\tldelem.ref\n"
 163   "\tcall\tnative int [mscorlib]System.Runtime.InteropServices.Marshal::"
 164            "StringToHGlobalAnsi(string)\n"
 165   "\tstloc\tptr\n"
 166   "\tldloc\targv\n"
 167   "\tldloc\ti\n";
 168   printPtrLoad(TD->getPointerSize());
 169   Out <<
 170   "\tmul\n"
 171   "\tadd\n"
 172   "\tldloc\tptr\n"
 173   "\tstind.i\n"
 174   "\tldloc\ti\n"
 175   "\tldc.i4.1\n"
 176   "\tadd\n"
 177   "\tstloc\ti\n"
 178   "\tbr\tL_01\n"
 179   "L_02:\n"
 180   "\tcall void $MSIL_Init()\n";
 181
 182   // Call user 'main' function.
 183   const Function* F = ModulePtr->getFunction("main");
 184   if (!F || F->isDeclaration()) {
 185     Out << "\tldc.i4.0\n\tret\n}\n";
 186     return;
 187   }
 188   bool BadSig = true;
 189   std::string Args("");
 190   Function::const_arg_iterator Arg1,Arg2;
 191
 192   switch (F->arg_size()) {
 193   case 0:
 194     BadSig = false;
 195     break;
 196   case 1:
 197     Arg1 = F->arg_begin();
 198     if (Arg1->getType()->isInteger()) {
 199       Out << "\tldloc\targc\n";
 200       Args = getTypeName(Arg1->getType());
 201       BadSig = false;
 202     }
 203     break;
 204   case 2:
 205     Arg1 = Arg2 = F->arg_begin(); ++Arg2;
 206     if (Arg1->getType()->isInteger() &&
 207         Arg2->getType()->getTypeID() == Type::PointerTyID) {
 208       Out << "\tldloc\targc\n\tldloc\targv\n";
 209       Args = getTypeName(Arg1->getType())+","+getTypeName(Arg2->getType());
 210       BadSig = false;
 211     }
 212     break;
 213   default:
 214     BadSig = true;
 215   }
 216
 217   bool RetVoid = (F->getReturnType()->getTypeID() == Type::VoidTyID);
 218   if (BadSig || (!F->getReturnType()->isInteger() && !RetVoid)) {
 219     Out << "\tldc.i4.0\n";
 220   } else {
 221     Out << "\tcall\t" << getTypeName(F->getReturnType()) <<
 222       getConvModopt(F->getCallingConv()) << "main(" << Args << ")\n";
 223     if (RetVoid)
 224       Out << "\tldc.i4.0\n";
 225     else
 226       Out << "\tconv.i4\n";
 227   }
 228   Out << "\tret\n}\n";
 229 }
 230
 231 bool MSILWriter::isZeroValue(const Value* V) {
 232   if (const Constant *C = dyn_cast<Constant>(V))
 233     return C->isNullValue();
 234   return false;
 235 }
 236
 237
 238 std::string MSILWriter::getValueName(const Value* V) {
 239   // Name into the quotes allow control and space characters.
 240   return "'"+Mang->getValueName(V)+"'";
 241 }
 242
 243
 244 std::string MSILWriter::getLabelName(const std::string& Name) {
 245   if (Name.find('.')!=std::string::npos) {
 246     std::string Tmp(Name);
 247     // Replace unaccepable characters in the label name.
 248     for (std::string::iterator I = Tmp.begin(), E = Tmp.end(); I!=E; ++I)
 249       if (*I=='.') *I = '@';
 250     return Tmp;
 251   }
 252   return Name;
 253 }
 254
 255
 256 std::string MSILWriter::getLabelName(const Value* V) {
 257   return getLabelName(Mang->getValueName(V));
 258 }
 259
 260
 261 std::string MSILWriter::getConvModopt(unsigned CallingConvID) {
 262   switch (CallingConvID) {
 263   case CallingConv::C:
 264   case CallingConv::Cold:
 265   case CallingConv::Fast:
 266     return "modopt([mscorlib]System.Runtime.CompilerServices.CallConvCdecl) ";
 267   case CallingConv::X86_FastCall:
 268     return "modopt([mscorlib]System.Runtime.CompilerServices.CallConvFastcall) ";
 269   case CallingConv::X86_StdCall:
 270     return "modopt([mscorlib]System.Runtime.CompilerServices.CallConvStdcall) ";
 271   default:
 272     cerr << "CallingConvID = " << CallingConvID << '\n';
 273     assert(0 && "Unsupported calling convention");
 274   }
 275   return ""; // Not reached
 276 }
 277
 278
 279 std::string MSILWriter::getArrayTypeName(Type::TypeID TyID, const Type* Ty) {
 280   std::string Tmp = "";
 281   const Type* ElemTy = Ty;
 282   assert(Ty->getTypeID()==TyID && "Invalid type passed");
 283   // Walk trought array element types.
 284   for (;;) {
 285     // Multidimensional array.
 286     if (ElemTy->getTypeID()==TyID) {
 287       if (const ArrayType* ATy = dyn_cast<ArrayType>(ElemTy))
 288         Tmp += utostr(ATy->getNumElements());
 289       else if (const VectorType* VTy = dyn_cast<VectorType>(ElemTy))
 290         Tmp += utostr(VTy->getNumElements());
 291       ElemTy = cast<SequentialType>(ElemTy)->getElementType();
 292     }
 293     // Base element type found.
 294     if (ElemTy->getTypeID()!=TyID) break;
 295     Tmp += ",";
 296   }
 297   return getTypeName(ElemTy, false, true)+"["+Tmp+"]";
 298 }
 299
 300
 301 std::string MSILWriter::getPrimitiveTypeName(const Type* Ty, bool isSigned) {
 302   unsigned NumBits = 0;
 303   switch (Ty->getTypeID()) {
 304   case Type::VoidTyID:
 305     return "void ";
 306   case Type::IntegerTyID:
 307     NumBits = getBitWidth(Ty);
 308     if(NumBits==1)
 309       return "bool ";
 310     if (!isSigned)
 311       return "unsigned int"+utostr(NumBits)+" ";
 312     return "int"+utostr(NumBits)+" ";
 313   case Type::FloatTyID:
 314     return "float32 ";
 315   case Type::DoubleTyID:
 316     return "float64 ";
 317   default:
 318     cerr << "Type = " << *Ty << '\n';
 319     assert(0 && "Invalid primitive type");
 320   }
 321   return ""; // Not reached
 322 }
 323
 324
 325 std::string MSILWriter::getTypeName(const Type* Ty, bool isSigned,
 326                                     bool isNested) {
 327   if (Ty->isPrimitiveType() || Ty->isInteger())
 328     return getPrimitiveTypeName(Ty,isSigned);
 329   // FIXME: "OpaqueType" support
 330   switch (Ty->getTypeID()) {
 331   case Type::PointerTyID:
 332     return "void* ";
 333   case Type::StructTyID:
 334     if (isNested)
 335       return ModulePtr->getTypeName(Ty);
 336     return "valuetype '"+ModulePtr->getTypeName(Ty)+"' ";
 337   case Type::ArrayTyID:
 338     if (isNested)
 339       return getArrayTypeName(Ty->getTypeID(),Ty);
 340     return "valuetype '"+getArrayTypeName(Ty->getTypeID(),Ty)+"' ";
 341   case Type::VectorTyID:
 342     if (isNested)
 343       return getArrayTypeName(Ty->getTypeID(),Ty);
 344     return "valuetype '"+getArrayTypeName(Ty->getTypeID(),Ty)+"' ";
 345   default:
 346     cerr << "Type = " << *Ty << '\n';
 347     assert(0 && "Invalid type in getTypeName()");
 348   }
 349   return ""; // Not reached
 350 }
 351
 352
 353 MSILWriter::ValueType MSILWriter::getValueLocation(const Value* V) {
 354   // Function argument
 355   if (isa<Argument>(V))
 356     return ArgumentVT;
 357   // Function
 358   else if (const Function* F = dyn_cast<Function>(V))
 359     return F->hasLocalLinkage() ? InternalVT : GlobalVT;
 360   // Variable
 361   else if (const GlobalVariable* G = dyn_cast<GlobalVariable>(V))
 362     return G->hasLocalLinkage() ? InternalVT : GlobalVT;
 363   // Constant
 364   else if (isa<Constant>(V))
 365     return isa<ConstantExpr>(V) ? ConstExprVT : ConstVT;
 366   // Local variable
 367   return LocalVT;
 368 }
 369
 370
 371 std::string MSILWriter::getTypePostfix(const Type* Ty, bool Expand,
 372                                        bool isSigned) {
 373   unsigned NumBits = 0;
 374   switch (Ty->getTypeID()) {
 375   // Integer constant, expanding for stack operations.
 376   case Type::IntegerTyID:
 377     NumBits = getBitWidth(Ty);
 378     // Expand integer value to "int32" or "int64".
 379     if (Expand) return (NumBits<=32 ? "i4" : "i8");
 380     if (NumBits==1) return "i1";
 381     return (isSigned ? "i" : "u")+utostr(NumBits/8);
 382   // Float constant.
 383   case Type::FloatTyID:
 384     return "r4";
 385   case Type::DoubleTyID:
 386     return "r8";
 387   case Type::PointerTyID:
 388     return "i"+utostr(TD->getTypePaddedSize(Ty));
 389   default:
 390     cerr << "TypeID = " << Ty->getTypeID() << '\n';
 391     assert(0 && "Invalid type in TypeToPostfix()");
 392   }
 393   return ""; // Not reached
 394 }
 395
 396
 397 void MSILWriter::printConvToPtr() {
 398   switch (ModulePtr->getPointerSize()) {
 399   case Module::Pointer32:
 400     printSimpleInstruction("conv.u4");
 401     break;
 402   case Module::Pointer64:
 403     printSimpleInstruction("conv.u8");
 404     break;
 405   default:
 406     assert(0 && "Module use not supporting pointer size");
 407   }
 408 }
 409
 410
 411 void MSILWriter::printPtrLoad(uint64_t N) {
 412   switch (ModulePtr->getPointerSize()) {
 413   case Module::Pointer32:
 414     printSimpleInstruction("ldc.i4",utostr(N).c_str());
 415     // FIXME: Need overflow test?
 416     if (!isUInt32(N)) {
 417       cerr << "Value = " << utostr(N) << '\n';
 418       assert(0 && "32-bit pointer overflowed");
 419     }
 420     break;
 421   case Module::Pointer64:
 422     printSimpleInstruction("ldc.i8",utostr(N).c_str());
 423     break;
 424   default:
 425     assert(0 && "Module use not supporting pointer size");
 426   }
 427 }
 428
 429
 430 void MSILWriter::printValuePtrLoad(const Value* V) {
 431   printValueLoad(V);
 432   printConvToPtr();
 433 }
 434
 435
 436 void MSILWriter::printConstLoad(const Constant* C) {
 437   if (const ConstantInt* CInt = dyn_cast<ConstantInt>(C)) {
 438     // Integer constant
 439     Out << "\tldc." << getTypePostfix(C->getType(),true) << '\t';
 440     if (CInt->isMinValue(true))
 441       Out << CInt->getSExtValue();
 442     else
 443       Out << CInt->getZExtValue();
 444   } else if (const ConstantFP* FP = dyn_cast<ConstantFP>(C)) {
 445     // Float constant
 446     uint64_t X;
 447     unsigned Size;
 448     if (FP->getType()->getTypeID()==Type::FloatTyID) {
 449       X = (uint32_t)FP->getValueAPF().bitcastToAPInt().getZExtValue();
 450       Size = 4;
 451     } else {
 452       X = FP->getValueAPF().bitcastToAPInt().getZExtValue();
 453       Size = 8;
 454     }
 455     Out << "\tldc.r" << Size << "\t( " << utohexstr(X) << ')';
 456   } else if (isa<UndefValue>(C)) {
 457     // Undefined constant value = NULL.
 458     printPtrLoad(0);
 459   } else {
 460     cerr << "Constant = " << *C << '\n';
 461     assert(0 && "Invalid constant value");
 462   }
 463   Out << '\n';
 464 }
 465
 466
 467 void MSILWriter::printValueLoad(const Value* V) {
 468   MSILWriter::ValueType Location = getValueLocation(V);
 469   switch (Location) {
 470   // Global variable or function address.
 471   case GlobalVT:
 472   case InternalVT:
 473     if (const Function* F = dyn_cast<Function>(V)) {
 474       std::string Name = getConvModopt(F->getCallingConv())+getValueName(F);
 475       printSimpleInstruction("ldftn",
 476         getCallSignature(F->getFunctionType(),NULL,Name).c_str());
 477     } else {
 478       std::string Tmp;
 479       const Type* ElemTy = cast<PointerType>(V->getType())->getElementType();
 480       if (Location==GlobalVT && cast<GlobalVariable>(V)->hasDLLImportLinkage()) {
 481         Tmp = "void* "+getValueName(V);
 482         printSimpleInstruction("ldsfld",Tmp.c_str());
 483       } else {
 484         Tmp = getTypeName(ElemTy)+getValueName(V);
 485         printSimpleInstruction("ldsflda",Tmp.c_str());
 486       }
 487     }
 488     break;
 489   // Function argument.
 490   case ArgumentVT:
 491     printSimpleInstruction("ldarg",getValueName(V).c_str());
 492     break;
 493   // Local function variable.
 494   case LocalVT:
 495     printSimpleInstruction("ldloc",getValueName(V).c_str());
 496     break;
 497   // Constant value.
 498   case ConstVT:
 499     if (isa<ConstantPointerNull>(V))
 500       printPtrLoad(0);
 501     else
 502       printConstLoad(cast<Constant>(V));
 503     break;
 504   // Constant expression.
 505   case ConstExprVT:
 506     printConstantExpr(cast<ConstantExpr>(V));
 507     break;
 508   default:
 509     cerr << "Value = " << *V << '\n';
 510     assert(0 && "Invalid value location");
 511   }
 512 }
 513
 514
 515 void MSILWriter::printValueSave(const Value* V) {
 516   switch (getValueLocation(V)) {
 517   case ArgumentVT:
 518     printSimpleInstruction("starg",getValueName(V).c_str());
 519     break;
 520   case LocalVT:
 521     printSimpleInstruction("stloc",getValueName(V).c_str());
 522     break;
 523   default:
 524     cerr << "Value  = " << *V << '\n';
 525     assert(0 && "Invalid value location");
 526   }
 527 }
 528
 529
 530 void MSILWriter::printBinaryInstruction(const char* Name, const Value* Left,
 531                                         const Value* Right) {
 532   printValueLoad(Left);
 533   printValueLoad(Right);
 534   Out << '\t' << Name << '\n';
 535 }
 536
 537
 538 void MSILWriter::printSimpleInstruction(const char* Inst, const char* Operand) {
 539   if(Operand)
 540     Out << '\t' << Inst << '\t' << Operand << '\n';
 541   else
 542     Out << '\t' << Inst << '\n';
 543 }
 544
 545
 546 void MSILWriter::printPHICopy(const BasicBlock* Src, const BasicBlock* Dst) {
 547   for (BasicBlock::const_iterator I = Dst->begin(), E = Dst->end();
 548        isa<PHINode>(I); ++I) {
 549     const PHINode* Phi = cast<PHINode>(I);
 550     const Value* Val = Phi->getIncomingValueForBlock(Src);
 551     if (isa<UndefValue>(Val)) continue;
 552     printValueLoad(Val);
 553     printValueSave(Phi);
 554   }
 555 }
 556
 557
 558 void MSILWriter::printBranchToBlock(const BasicBlock* CurrBB,
 559                                     const BasicBlock* TrueBB,
 560                                     const BasicBlock* FalseBB) {
 561   if (TrueBB==FalseBB) {
 562     // "TrueBB" and "FalseBB" destination equals
 563     printPHICopy(CurrBB,TrueBB);
 564     printSimpleInstruction("pop");
 565     printSimpleInstruction("br",getLabelName(TrueBB).c_str());
 566   } else if (FalseBB==NULL) {
 567     // If "FalseBB" not used the jump have condition
 568     printPHICopy(CurrBB,TrueBB);
 569     printSimpleInstruction("brtrue",getLabelName(TrueBB).c_str());
 570   } else if (TrueBB==NULL) {
 571     // If "TrueBB" not used the jump is unconditional
 572     printPHICopy(CurrBB,FalseBB);
 573     printSimpleInstruction("br",getLabelName(FalseBB).c_str());
 574   } else {
 575     // Copy PHI instructions for each block
 576     std::string TmpLabel;
 577     // Print PHI instructions for "TrueBB"
 578     if (isa<PHINode>(TrueBB->begin())) {
 579       TmpLabel = getLabelName(TrueBB)+"$phi_"+utostr(getUniqID());
 580       printSimpleInstruction("brtrue",TmpLabel.c_str());
 581     } else {
 582       printSimpleInstruction("brtrue",getLabelName(TrueBB).c_str());
 583     }
 584     // Print PHI instructions for "FalseBB"
 585     if (isa<PHINode>(FalseBB->begin())) {
 586       printPHICopy(CurrBB,FalseBB);
 587       printSimpleInstruction("br",getLabelName(FalseBB).c_str());
 588     } else {
 589       printSimpleInstruction("br",getLabelName(FalseBB).c_str());
 590     }
 591     if (isa<PHINode>(TrueBB->begin())) {
 592       // Handle "TrueBB" PHI Copy
 593       Out << TmpLabel << ":\n";
 594       printPHICopy(CurrBB,TrueBB);
 595       printSimpleInstruction("br",getLabelName(TrueBB).c_str());
 596     }
 597   }
 598 }
 599
 600
 601 void MSILWriter::printBranchInstruction(const BranchInst* Inst) {
 602   if (Inst->isUnconditional()) {
 603     printBranchToBlock(Inst->getParent(),NULL,Inst->getSuccessor(0));
 604   } else {
 605     printValueLoad(Inst->getCondition());
 606     printBranchToBlock(Inst->getParent(),Inst->getSuccessor(0),
 607                        Inst->getSuccessor(1));
 608   }
 609 }
 610
 611
 612 void MSILWriter::printSelectInstruction(const Value* Cond, const Value* VTrue,
 613                                         const Value* VFalse) {
 614   std::string TmpLabel = std::string("select$true_")+utostr(getUniqID());
 615   printValueLoad(VTrue);
 616   printValueLoad(Cond);
 617   printSimpleInstruction("brtrue",TmpLabel.c_str());
 618   printSimpleInstruction("pop");
 619   printValueLoad(VFalse);
 620   Out << TmpLabel << ":\n";
 621 }
 622
 623
 624 void MSILWriter::printIndirectLoad(const Value* V) {
 625   const Type* Ty = V->getType();
 626   printValueLoad(V);
 627   if (const PointerType* P = dyn_cast<PointerType>(Ty))
 628     Ty = P->getElementType();
 629   std::string Tmp = "ldind."+getTypePostfix(Ty, false);
 630   printSimpleInstruction(Tmp.c_str());
 631 }
 632
 633
 634 void MSILWriter::printIndirectSave(const Value* Ptr, const Value* Val) {
 635   printValueLoad(Ptr);
 636   printValueLoad(Val);
 637   printIndirectSave(Val->getType());
 638 }
 639
 640
 641 void MSILWriter::printIndirectSave(const Type* Ty) {
 642   // Instruction need signed postfix for any type.
 643   std::string postfix = getTypePostfix(Ty, false);
 644   if (*postfix.begin()=='u') *postfix.begin() = 'i';
 645   postfix = "stind."+postfix;
 646   printSimpleInstruction(postfix.c_str());
 647 }
 648
 649
 650 void MSILWriter::printCastInstruction(unsigned int Op, const Value* V,
 651                                       const Type* Ty) {
 652   std::string Tmp("");
 653   printValueLoad(V);
 654   switch (Op) {
 655   // Signed
 656   case Instruction::SExt:
 657   case Instruction::SIToFP:
 658   case Instruction::FPToSI:
 659     Tmp = "conv."+getTypePostfix(Ty,false,true);
 660     printSimpleInstruction(Tmp.c_str());
 661     break;
 662   // Unsigned
 663   case Instruction::FPTrunc:
 664   case Instruction::FPExt:
 665   case Instruction::UIToFP:
 666   case Instruction::Trunc:
 667   case Instruction::ZExt:
 668   case Instruction::FPToUI:
 669   case Instruction::PtrToInt:
 670   case Instruction::IntToPtr:
 671     Tmp = "conv."+getTypePostfix(Ty,false);
 672     printSimpleInstruction(Tmp.c_str());
 673     break;
 674   // Do nothing
 675   case Instruction::BitCast:
 676     // FIXME: meaning that ld*/st* instruction do not change data format.
 677     break;
 678   default:
 679     cerr << "Opcode = " << Op << '\n';
 680     assert(0 && "Invalid conversion instruction");
 681   }
 682 }
 683
 684
 685 void MSILWriter::printGepInstruction(const Value* V, gep_type_iterator I,
 686                                      gep_type_iterator E) {
 687   unsigned Size;
 688   // Load address
 689   printValuePtrLoad(V);
 690   // Calculate element offset.
 691   for (; I!=E; ++I){
 692     Size = 0;
 693     const Value* IndexValue = I.getOperand();
 694     if (const StructType* StrucTy = dyn_cast<StructType>(*I)) {
 695       uint64_t FieldIndex = cast<ConstantInt>(IndexValue)->getZExtValue();
 696       // Offset is the sum of all previous structure fields.
 697       for (uint64_t F = 0; F<FieldIndex; ++F)
 698         Size += TD->getTypePaddedSize(StrucTy->getContainedType((unsigned)F));
 699       printPtrLoad(Size);
 700       printSimpleInstruction("add");
 701       continue;
 702     } else if (const SequentialType* SeqTy = dyn_cast<SequentialType>(*I)) {
 703       Size = TD->getTypePaddedSize(SeqTy->getElementType());
 704     } else {
 705       Size = TD->getTypePaddedSize(*I);
 706     }
 707     // Add offset of current element to stack top.
 708     if (!isZeroValue(IndexValue)) {
 709       // Constant optimization.
 710       if (const ConstantInt* C = dyn_cast<ConstantInt>(IndexValue)) {
 711         if (C->getValue().isNegative()) {
 712           printPtrLoad(C->getValue().abs().getZExtValue()*Size);
 713           printSimpleInstruction("sub");
 714           continue;
 715         } else
 716           printPtrLoad(C->getZExtValue()*Size);
 717       } else {
 718         printPtrLoad(Size);
 719         printValuePtrLoad(IndexValue);
 720         printSimpleInstruction("mul");
 721       }
 722       printSimpleInstruction("add");
 723     }
 724   }
 725 }
 726
 727
 728 std::string MSILWriter::getCallSignature(const FunctionType* Ty,
 729                                          const Instruction* Inst,
 730                                          std::string Name) {
 731   std::string Tmp("");
 732   if (Ty->isVarArg()) Tmp += "vararg ";
 733   // Name and return type.
 734   Tmp += getTypeName(Ty->getReturnType())+Name+"(";
 735   // Function argument type list.
 736   unsigned NumParams = Ty->getNumParams();
 737   for (unsigned I = 0; I!=NumParams; ++I) {
 738     if (I!=0) Tmp += ",";
 739     Tmp += getTypeName(Ty->getParamType(I));
 740   }
 741   // CLR needs to know the exact amount of parameters received by vararg
 742   // function, because caller cleans the stack.
 743   if (Ty->isVarArg() && Inst) {
 744     // Origin to function arguments in "CallInst" or "InvokeInst".
 745     unsigned Org = isa<InvokeInst>(Inst) ? 3 : 1;
 746     // Print variable argument types.
 747     unsigned NumOperands = Inst->getNumOperands()-Org;
 748     if (NumParams<NumOperands) {
 749       if (NumParams!=0) Tmp += ", ";
 750       Tmp += "... , ";
 751       for (unsigned J = NumParams; J!=NumOperands; ++J) {
 752         if (J!=NumParams) Tmp += ", ";
 753         Tmp += getTypeName(Inst->getOperand(J+Org)->getType());
 754       }
 755     }
 756   }
 757   return Tmp+")";
 758 }
 759
 760
 761 void MSILWriter::printFunctionCall(const Value* FnVal,
 762                                    const Instruction* Inst) {
 763   // Get function calling convention.
 764   std::string Name = "";
 765   if (const CallInst* Call = dyn_cast<CallInst>(Inst))
 766     Name = getConvModopt(Call->getCallingConv());
 767   else if (const InvokeInst* Invoke = dyn_cast<InvokeInst>(Inst))
 768     Name = getConvModopt(Invoke->getCallingConv());
 769   else {
 770     cerr << "Instruction = " << Inst->getName() << '\n';
 771     assert(0 && "Need \"Invoke\" or \"Call\" instruction only");
 772   }
 773   if (const Function* F = dyn_cast<Function>(FnVal)) {
 774     // Direct call.
 775     Name += getValueName(F);
 776     printSimpleInstruction("call",
 777       getCallSignature(F->getFunctionType(),Inst,Name).c_str());
 778   } else {
 779     // Indirect function call.
 780     const PointerType* PTy = cast<PointerType>(FnVal->getType());
 781     const FunctionType* FTy = cast<FunctionType>(PTy->getElementType());
 782     // Load function address.
 783     printValueLoad(FnVal);
 784     printSimpleInstruction("calli",getCallSignature(FTy,Inst,Name).c_str());
 785   }
 786 }
 787
 788
 789 void MSILWriter::printIntrinsicCall(const IntrinsicInst* Inst) {
 790   std::string Name;
 791   switch (Inst->getIntrinsicID()) {
 792   case Intrinsic::vastart:
 793     Name = getValueName(Inst->getOperand(1));
 794     Name.insert(Name.length()-1,"$valist");
 795     // Obtain the argument handle.
 796     printSimpleInstruction("ldloca",Name.c_str());
 797     printSimpleInstruction("arglist");
 798     printSimpleInstruction("call",
 799       "instance void [mscorlib]System.ArgIterator::.ctor"
 800       "(valuetype [mscorlib]System.RuntimeArgumentHandle)");
 801     // Save as pointer type "void*"
 802     printValueLoad(Inst->getOperand(1));
 803     printSimpleInstruction("ldloca",Name.c_str());
 804     printIndirectSave(PointerType::getUnqual(IntegerType::get(8)));
 805     break;
 806   case Intrinsic::vaend:
 807     // Close argument list handle.
 808     printIndirectLoad(Inst->getOperand(1));
 809     printSimpleInstruction("call","instance void [mscorlib]System.ArgIterator::End()");
 810     break;
 811   case Intrinsic::vacopy:
 812     // Copy "ArgIterator" valuetype.
 813     printIndirectLoad(Inst->getOperand(1));
 814     printIndirectLoad(Inst->getOperand(2));
 815     printSimpleInstruction("cpobj","[mscorlib]System.ArgIterator");
 816     break;
 817   default:
 818     cerr << "Intrinsic ID = " << Inst->getIntrinsicID() << '\n';
 819     assert(0 && "Invalid intrinsic function");
 820   }
 821 }
 822
 823
 824 void MSILWriter::printCallInstruction(const Instruction* Inst) {
 825   if (isa<IntrinsicInst>(Inst)) {
 826     // Handle intrinsic function.
 827     printIntrinsicCall(cast<IntrinsicInst>(Inst));
 828   } else {
 829     // Load arguments to stack and call function.
 830     for (int I = 1, E = Inst->getNumOperands(); I!=E; ++I)
 831       printValueLoad(Inst->getOperand(I));
 832     printFunctionCall(Inst->getOperand(0),Inst);
 833   }
 834 }
 835
 836
 837 void MSILWriter::printICmpInstruction(unsigned Predicate, const Value* Left,
 838                                       const Value* Right) {
 839   switch (Predicate) {
 840   case ICmpInst::ICMP_EQ:
 841     printBinaryInstruction("ceq",Left,Right);
 842     break;
 843   case ICmpInst::ICMP_NE:
 844     // Emulate = not neg (Op1 eq Op2)
 845     printBinaryInstruction("ceq",Left,Right);
 846     printSimpleInstruction("neg");
 847     printSimpleInstruction("not");
 848     break;
 849   case ICmpInst::ICMP_ULE:
 850   case ICmpInst::ICMP_SLE:
 851     // Emulate = (Op1 eq Op2) or (Op1 lt Op2)
 852     printBinaryInstruction("ceq",Left,Right);
 853     if (Predicate==ICmpInst::ICMP_ULE)
 854       printBinaryInstruction("clt.un",Left,Right);
 855     else
 856       printBinaryInstruction("clt",Left,Right);
 857     printSimpleInstruction("or");
 858     break;
 859   case ICmpInst::ICMP_UGE:
 860   case ICmpInst::ICMP_SGE:
 861     // Emulate = (Op1 eq Op2) or (Op1 gt Op2)
 862     printBinaryInstruction("ceq",Left,Right);
 863     if (Predicate==ICmpInst::ICMP_UGE)
 864       printBinaryInstruction("cgt.un",Left,Right);
 865     else
 866       printBinaryInstruction("cgt",Left,Right);
 867     printSimpleInstruction("or");
 868     break;
 869   case ICmpInst::ICMP_ULT:
 870     printBinaryInstruction("clt.un",Left,Right);
 871     break;
 872   case ICmpInst::ICMP_SLT:
 873     printBinaryInstruction("clt",Left,Right);
 874     break;
 875   case ICmpInst::ICMP_UGT:
 876     printBinaryInstruction("cgt.un",Left,Right);
 877   case ICmpInst::ICMP_SGT:
 878     printBinaryInstruction("cgt",Left,Right);
 879     break;
 880   default:
 881     cerr << "Predicate = " << Predicate << '\n';
 882     assert(0 && "Invalid icmp predicate");
 883   }
 884 }
 885
 886
 887 void MSILWriter::printFCmpInstruction(unsigned Predicate, const Value* Left,
 888                                       const Value* Right) {
 889   // FIXME: Correct comparison
 890   std::string NanFunc = "bool [mscorlib]System.Double::IsNaN(float64)";
 891   switch (Predicate) {
 892   case FCmpInst::FCMP_UGT:
 893     // X >  Y || llvm_fcmp_uno(X, Y)
 894     printBinaryInstruction("cgt",Left,Right);
 895     printFCmpInstruction(FCmpInst::FCMP_UNO,Left,Right);
 896     printSimpleInstruction("or");
 897     break;
 898   case FCmpInst::FCMP_OGT:
 899     // X >  Y
 900     printBinaryInstruction("cgt",Left,Right);
 901     break;
 902   case FCmpInst::FCMP_UGE:
 903     // X >= Y || llvm_fcmp_uno(X, Y)
 904     printBinaryInstruction("ceq",Left,Right);
 905     printBinaryInstruction("cgt",Left,Right);
 906     printSimpleInstruction("or");
 907     printFCmpInstruction(FCmpInst::FCMP_UNO,Left,Right);
 908     printSimpleInstruction("or");
 909     break;
 910   case FCmpInst::FCMP_OGE:
 911     // X >= Y
 912     printBinaryInstruction("ceq",Left,Right);
 913     printBinaryInstruction("cgt",Left,Right);
 914     printSimpleInstruction("or");
 915     break;
 916   case FCmpInst::FCMP_ULT:
 917     // X <  Y || llvm_fcmp_uno(X, Y)
 918     printBinaryInstruction("clt",Left,Right);
 919     printFCmpInstruction(FCmpInst::FCMP_UNO,Left,Right);
 920     printSimpleInstruction("or");
 921     break;
 922   case FCmpInst::FCMP_OLT:
 923     // X <  Y
 924     printBinaryInstruction("clt",Left,Right);
 925     break;
 926   case FCmpInst::FCMP_ULE:
 927     // X <= Y || llvm_fcmp_uno(X, Y)
 928     printBinaryInstruction("ceq",Left,Right);
 929     printBinaryInstruction("clt",Left,Right);
 930     printSimpleInstruction("or");
 931     printFCmpInstruction(FCmpInst::FCMP_UNO,Left,Right);
 932     printSimpleInstruction("or");
 933     break;
 934   case FCmpInst::FCMP_OLE:
 935     // X <= Y
 936     printBinaryInstruction("ceq",Left,Right);
 937     printBinaryInstruction("clt",Left,Right);
 938     printSimpleInstruction("or");
 939     break;
 940   case FCmpInst::FCMP_UEQ:
 941     // X == Y || llvm_fcmp_uno(X, Y)
 942     printBinaryInstruction("ceq",Left,Right);
 943     printFCmpInstruction(FCmpInst::FCMP_UNO,Left,Right);
 944     printSimpleInstruction("or");
 945     break;
 946   case FCmpInst::FCMP_OEQ:
 947     // X == Y
 948     printBinaryInstruction("ceq",Left,Right);
 949     break;
 950   case FCmpInst::FCMP_UNE:
 951     // X != Y
 952     printBinaryInstruction("ceq",Left,Right);
 953     printSimpleInstruction("neg");
 954     printSimpleInstruction("not");
 955     break;
 956   case FCmpInst::FCMP_ONE:
 957     // X != Y && llvm_fcmp_ord(X, Y)
 958     printBinaryInstruction("ceq",Left,Right);
 959     printSimpleInstruction("not");
 960     break;
 961   case FCmpInst::FCMP_ORD:
 962     // return X == X && Y == Y
 963     printBinaryInstruction("ceq",Left,Left);
 964     printBinaryInstruction("ceq",Right,Right);
 965     printSimpleInstruction("or");
 966     break;
 967   case FCmpInst::FCMP_UNO:
 968     // X != X || Y != Y
 969     printBinaryInstruction("ceq",Left,Left);
 970     printSimpleInstruction("not");
 971     printBinaryInstruction("ceq",Right,Right);
 972     printSimpleInstruction("not");
 973     printSimpleInstruction("or");
 974     break;
 975   default:
 976     assert(0 && "Illegal FCmp predicate");
 977   }
 978 }
 979
 980
 981 void MSILWriter::printInvokeInstruction(const InvokeInst* Inst) {
 982   std::string Label = "leave$normal_"+utostr(getUniqID());
 983   Out << ".try {\n";
 984   // Load arguments
 985   for (int I = 3, E = Inst->getNumOperands(); I!=E; ++I)
 986     printValueLoad(Inst->getOperand(I));
 987   // Print call instruction
 988   printFunctionCall(Inst->getOperand(0),Inst);
 989   // Save function result and leave "try" block
 990   printValueSave(Inst);
 991   printSimpleInstruction("leave",Label.c_str());
 992   Out << "}\n";
 993   Out << "catch [mscorlib]System.Exception {\n";
 994   // Redirect to unwind block
 995   printSimpleInstruction("pop");
 996   printBranchToBlock(Inst->getParent(),NULL,Inst->getUnwindDest());
 997   Out << "}\n" << Label << ":\n";
 998   // Redirect to continue block
 999   printBranchToBlock(Inst->getParent(),NULL,Inst->getNormalDest());
1000 }
1001
1002
1003 void MSILWriter::printSwitchInstruction(const SwitchInst* Inst) {
1004   // FIXME: Emulate with IL "switch" instruction
1005   // Emulate = if () else if () else if () else ...
1006   for (unsigned int I = 1, E = Inst->getNumCases(); I!=E; ++I) {
1007     printValueLoad(Inst->getCondition());
1008     printValueLoad(Inst->getCaseValue(I));
1009     printSimpleInstruction("ceq");
1010     // Condition jump to successor block
1011     printBranchToBlock(Inst->getParent(),Inst->getSuccessor(I),NULL);
1012   }
1013   // Jump to default block
1014   printBranchToBlock(Inst->getParent(),NULL,Inst->getDefaultDest());
1015 }
1016
1017
1018 void MSILWriter::printVAArgInstruction(const VAArgInst* Inst) {
1019   printIndirectLoad(Inst->getOperand(0));
1020   printSimpleInstruction("call",
1021     "instance typedref [mscorlib]System.ArgIterator::GetNextArg()");
1022   printSimpleInstruction("refanyval","void*");
1023   std::string Name =
1024     "ldind."+getTypePostfix(PointerType::getUnqual(IntegerType::get(8)),false);
1025   printSimpleInstruction(Name.c_str());
1026 }
1027
1028
1029 void MSILWriter::printAllocaInstruction(const AllocaInst* Inst) {
1030   uint64_t Size = TD->getTypePaddedSize(Inst->getAllocatedType());
1031   // Constant optimization.
1032   if (const ConstantInt* CInt = dyn_cast<ConstantInt>(Inst->getOperand(0))) {
1033     printPtrLoad(CInt->getZExtValue()*Size);
1034   } else {
1035     printPtrLoad(Size);
1036     printValueLoad(Inst->getOperand(0));
1037     printSimpleInstruction("mul");
1038   }
1039   printSimpleInstruction("localloc");
1040 }
1041
1042
1043 void MSILWriter::printInstruction(const Instruction* Inst) {
1044   const Value *Left = 0, *Right = 0;
1045   if (Inst->getNumOperands()>=1) Left = Inst->getOperand(0);
1046   if (Inst->getNumOperands()>=2) Right = Inst->getOperand(1);
1047   // Print instruction
1048   // FIXME: "ShuffleVector","ExtractElement","InsertElement" support.
1049   switch (Inst->getOpcode()) {
1050   // Terminator
1051   case Instruction::Ret:
1052     if (Inst->getNumOperands()) {
1053       printValueLoad(Left);
1054       printSimpleInstruction("ret");
1055     } else
1056       printSimpleInstruction("ret");
1057     break;
1058   case Instruction::Br:
1059     printBranchInstruction(cast<BranchInst>(Inst));
1060     break;
1061   // Binary
1062   case Instruction::Add:
1063     printBinaryInstruction("add",Left,Right);
1064     break;
1065   case Instruction::Sub:
1066     printBinaryInstruction("sub",Left,Right);
1067     break;
1068   case Instruction::Mul:
1069     printBinaryInstruction("mul",Left,Right);
1070     break;
1071   case Instruction::UDiv:
1072     printBinaryInstruction("div.un",Left,Right);
1073     break;
1074   case Instruction::SDiv:
1075   case Instruction::FDiv:
1076     printBinaryInstruction("div",Left,Right);
1077     break;
1078   case Instruction::URem:
1079     printBinaryInstruction("rem.un",Left,Right);
1080     break;
1081   case Instruction::SRem:
1082   case Instruction::FRem:
1083     printBinaryInstruction("rem",Left,Right);
1084     break;
1085   // Binary Condition
1086   case Instruction::ICmp:
1087     printICmpInstruction(cast<ICmpInst>(Inst)->getPredicate(),Left,Right);
1088     break;
1089   case Instruction::FCmp:
1090     printFCmpInstruction(cast<FCmpInst>(Inst)->getPredicate(),Left,Right);
1091     break;
1092   // Bitwise Binary
1093   case Instruction::And:
1094     printBinaryInstruction("and",Left,Right);
1095     break;
1096   case Instruction::Or:
1097     printBinaryInstruction("or",Left,Right);
1098     break;
1099   case Instruction::Xor:
1100     printBinaryInstruction("xor",Left,Right);
1101     break;
1102   case Instruction::Shl:
1103     printValueLoad(Left);
1104     printValueLoad(Right);
1105     printSimpleInstruction("conv.i4");
1106     printSimpleInstruction("shl");
1107     break;
1108   case Instruction::LShr:
1109     printValueLoad(Left);
1110     printValueLoad(Right);
1111     printSimpleInstruction("conv.i4");
1112     printSimpleInstruction("shr.un");
1113     break;
1114   case Instruction::AShr:
1115     printValueLoad(Left);
1116     printValueLoad(Right);
1117     printSimpleInstruction("conv.i4");
1118     printSimpleInstruction("shr");
1119     break;
1120   case Instruction::Select:
1121     printSelectInstruction(Inst->getOperand(0),Inst->getOperand(1),Inst->getOperand(2));
1122     break;
1123   case Instruction::Load:
1124     printIndirectLoad(Inst->getOperand(0));
1125     break;
1126   case Instruction::Store:
1127     printIndirectSave(Inst->getOperand(1), Inst->getOperand(0));
1128     break;
1129   case Instruction::Trunc:
1130   case Instruction::ZExt:
1131   case Instruction::SExt:
1132   case Instruction::FPTrunc:
1133   case Instruction::FPExt:
1134   case Instruction::UIToFP:
1135   case Instruction::SIToFP:
1136   case Instruction::FPToUI:
1137   case Instruction::FPToSI:
1138   case Instruction::PtrToInt:
1139   case Instruction::IntToPtr:
1140   case Instruction::BitCast:
1141     printCastInstruction(Inst->getOpcode(),Left,
1142                          cast<CastInst>(Inst)->getDestTy());
1143     break;
1144   case Instruction::GetElementPtr:
1145     printGepInstruction(Inst->getOperand(0),gep_type_begin(Inst),
1146                         gep_type_end(Inst));
1147     break;
1148   case Instruction::Call:
1149     printCallInstruction(cast<CallInst>(Inst));
1150     break;
1151   case Instruction::Invoke:
1152     printInvokeInstruction(cast<InvokeInst>(Inst));
1153     break;
1154   case Instruction::Unwind:
1155     printSimpleInstruction("newobj",
1156       "instance void [mscorlib]System.Exception::.ctor()");
1157     printSimpleInstruction("throw");
1158     break;
1159   case Instruction::Switch:
1160     printSwitchInstruction(cast<SwitchInst>(Inst));
1161     break;
1162   case Instruction::Alloca:
1163     printAllocaInstruction(cast<AllocaInst>(Inst));
1164     break;
1165   case Instruction::Malloc:
1166     assert(0 && "LowerAllocationsPass used");
1167     break;
1168   case Instruction::Free:
1169     assert(0 && "LowerAllocationsPass used");
1170     break;
1171   case Instruction::Unreachable:
1172     printSimpleInstruction("ldstr", "\"Unreachable instruction\"");
1173     printSimpleInstruction("newobj",
1174       "instance void [mscorlib]System.Exception::.ctor(string)");
1175     printSimpleInstruction("throw");
1176     break;
1177   case Instruction::VAArg:
1178     printVAArgInstruction(cast<VAArgInst>(Inst));
1179     break;
1180   default:
1181     cerr << "Instruction = " << Inst->getName() << '\n';
1182     assert(0 && "Unsupported instruction");
1183   }
1184 }
1185
1186
1187 void MSILWriter::printLoop(const Loop* L) {
1188   Out << getLabelName(L->getHeader()->getName()) << ":\n";
1189   const std::vector<BasicBlock*>& blocks = L->getBlocks();
1190   for (unsigned I = 0, E = blocks.size(); I!=E; I++) {
1191     BasicBlock* BB = blocks[I];
1192     Loop* BBLoop = LInfo->getLoopFor(BB);
1193     if (BBLoop == L)
1194       printBasicBlock(BB);
1195     else if (BB==BBLoop->getHeader() && BBLoop->getParentLoop()==L)
1196       printLoop(BBLoop);
1197   }
1198   printSimpleInstruction("br",getLabelName(L->getHeader()->getName()).c_str());
1199 }
1200
1201
1202 void MSILWriter::printBasicBlock(const BasicBlock* BB) {
1203   Out << getLabelName(BB) << ":\n";
1204   for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I!=E; ++I) {
1205     const Instruction* Inst = I;
1206     // Comment llvm original instruction
1207     // Out << "\n//" << *Inst << "\n";
1208     // Do not handle PHI instruction in current block
1209     if (Inst->getOpcode()==Instruction::PHI) continue;
1210     // Print instruction
1211     printInstruction(Inst);
1212     // Save result
1213     if (Inst->getType()!=Type::VoidTy) {
1214       // Do not save value after invoke, it done in "try" block
1215       if (Inst->getOpcode()==Instruction::Invoke) continue;
1216       printValueSave(Inst);
1217     }
1218   }
1219 }
1220
1221
1222 void MSILWriter::printLocalVariables(const Function& F) {
1223   std::string Name;
1224   const Type* Ty = NULL;
1225   std::set<const Value*> Printed;
1226   const Value* VaList = NULL;
1227   unsigned StackDepth = 8;
1228   // Find local variables
1229   for (const_inst_iterator I = inst_begin(&F), E = inst_end(&F); I!=E; ++I) {
1230     if (I->getOpcode()==Instruction::Call ||
1231         I->getOpcode()==Instruction::Invoke) {
1232       // Test stack depth.
1233       if (StackDepth<I->getNumOperands())
1234         StackDepth = I->getNumOperands();
1235     }
1236     const AllocaInst* AI = dyn_cast<AllocaInst>(&*I);
1237     if (AI && !isa<GlobalVariable>(AI)) {
1238       // Local variable allocation.
1239       Ty = PointerType::getUnqual(AI->getAllocatedType());
1240       Name = getValueName(AI);
1241       Out << "\t.locals (" << getTypeName(Ty) << Name << ")\n";
1242     } else if (I->getType()!=Type::VoidTy) {
1243       // Operation result.
1244       Ty = I->getType();
1245       Name = getValueName(&*I);
1246       Out << "\t.locals (" << getTypeName(Ty) << Name << ")\n";
1247     }
1248     // Test on 'va_list' variable
1249     bool isVaList = false;
1250     if (const VAArgInst* VaInst = dyn_cast<VAArgInst>(&*I)) {
1251       // "va_list" as "va_arg" instruction operand.
1252       isVaList = true;
1253       VaList = VaInst->getOperand(0);
1254     } else if (const IntrinsicInst* Inst = dyn_cast<IntrinsicInst>(&*I)) {
1255       // "va_list" as intrinsic function operand.
1256       switch (Inst->getIntrinsicID()) {
1257       case Intrinsic::vastart:
1258       case Intrinsic::vaend:
1259       case Intrinsic::vacopy:
1260         isVaList = true;
1261         VaList = Inst->getOperand(1);
1262         break;
1263       default:
1264         isVaList = false;
1265       }
1266     }
1267     // Print "va_list" variable.
1268     if (isVaList && Printed.insert(VaList).second) {
1269       Name = getValueName(VaList);
1270       Name.insert(Name.length()-1,"$valist");
1271       Out << "\t.locals (valuetype [mscorlib]System.ArgIterator "
1272           << Name << ")\n";
1273     }
1274   }
1275   printSimpleInstruction(".maxstack",utostr(StackDepth*2).c_str());
1276 }
1277
1278
1279 void MSILWriter::printFunctionBody(const Function& F) {
1280   // Print body
1281   for (Function::const_iterator I = F.begin(), E = F.end(); I!=E; ++I) {
1282     if (Loop *L = LInfo->getLoopFor(I)) {
1283       if (L->getHeader()==I && L->getParentLoop()==0)
1284         printLoop(L);
1285     } else {
1286       printBasicBlock(I);
1287     }
1288   }
1289 }
1290
1291
1292 void MSILWriter::printConstantExpr(const ConstantExpr* CE) {
1293   const Value *left = 0, *right = 0;
1294   if (CE->getNumOperands()>=1) left = CE->getOperand(0);
1295   if (CE->getNumOperands()>=2) right = CE->getOperand(1);
1296   // Print instruction
1297   switch (CE->getOpcode()) {
1298   case Instruction::Trunc:
1299   case Instruction::ZExt:
1300   case Instruction::SExt:
1301   case Instruction::FPTrunc:
1302   case Instruction::FPExt:
1303   case Instruction::UIToFP:
1304   case Instruction::SIToFP:
1305   case Instruction::FPToUI:
1306   case Instruction::FPToSI:
1307   case Instruction::PtrToInt:
1308   case Instruction::IntToPtr:
1309   case Instruction::BitCast:
1310     printCastInstruction(CE->getOpcode(),left,CE->getType());
1311     break;
1312   case Instruction::GetElementPtr:
1313     printGepInstruction(CE->getOperand(0),gep_type_begin(CE),gep_type_end(CE));
1314     break;
1315   case Instruction::ICmp:
1316     printICmpInstruction(CE->getPredicate(),left,right);
1317     break;
1318   case Instruction::FCmp:
1319     printFCmpInstruction(CE->getPredicate(),left,right);
1320     break;
1321   case Instruction::Select:
1322     printSelectInstruction(CE->getOperand(0),CE->getOperand(1),CE->getOperand(2));
1323     break;
1324   case Instruction::Add:
1325     printBinaryInstruction("add",left,right);
1326     break;
1327   case Instruction::Sub:
1328     printBinaryInstruction("sub",left,right);
1329     break;
1330   case Instruction::Mul:
1331     printBinaryInstruction("mul",left,right);
1332     break;
1333   case Instruction::UDiv:
1334     printBinaryInstruction("div.un",left,right);
1335     break;
1336   case Instruction::SDiv:
1337   case Instruction::FDiv:
1338     printBinaryInstruction("div",left,right);
1339     break;
1340   case Instruction::URem:
1341     printBinaryInstruction("rem.un",left,right);
1342     break;
1343   case Instruction::SRem:
1344   case Instruction::FRem:
1345     printBinaryInstruction("rem",left,right);
1346     break;
1347   case Instruction::And:
1348     printBinaryInstruction("and",left,right);
1349     break;
1350   case Instruction::Or:
1351     printBinaryInstruction("or",left,right);
1352     break;
1353   case Instruction::Xor:
1354     printBinaryInstruction("xor",left,right);
1355     break;
1356   case Instruction::Shl:
1357     printBinaryInstruction("shl",left,right);
1358     break;
1359   case Instruction::LShr:
1360     printBinaryInstruction("shr.un",left,right);
1361     break;
1362   case Instruction::AShr:
1363     printBinaryInstruction("shr",left,right);
1364     break;
1365   default:
1366     cerr << "Expression = " << *CE << "\n";
1367     assert(0 && "Invalid constant expression");
1368   }
1369 }
1370
1371
1372 void MSILWriter::printStaticInitializerList() {
1373   // List of global variables with uninitialized fields.
1374   for (std::map<const GlobalVariable*,std::vector<StaticInitializer> >::iterator
1375        VarI = StaticInitList.begin(), VarE = StaticInitList.end(); VarI!=VarE;
1376        ++VarI) {
1377     const std::vector<StaticInitializer>& InitList = VarI->second;
1378     if (InitList.empty()) continue;
1379     // For each uninitialized field.
1380     for (std::vector<StaticInitializer>::const_iterator I = InitList.begin(),
1381          E = InitList.end(); I!=E; ++I) {
1382       if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(I->constant)) {
1383         // Out << "\n// Init " << getValueName(VarI->first) << ", offset " <<
1384         //  utostr(I->offset) << ", type "<< *I->constant->getType() << "\n\n";
1385         // Load variable address
1386         printValueLoad(VarI->first);
1387         // Add offset
1388         if (I->offset!=0) {
1389           printPtrLoad(I->offset);
1390           printSimpleInstruction("add");
1391         }
1392         // Load value
1393         printConstantExpr(CE);
1394         // Save result at offset
1395         std::string postfix = getTypePostfix(CE->getType(),true);
1396         if (*postfix.begin()=='u') *postfix.begin() = 'i';
1397         postfix = "stind."+postfix;
1398         printSimpleInstruction(postfix.c_str());
1399       } else {
1400         cerr << "Constant = " << *I->constant << '\n';
1401         assert(0 && "Invalid static initializer");
1402       }
1403     }
1404   }
1405 }
1406
1407
1408 void MSILWriter::printFunction(const Function& F) {
1409   bool isSigned = F.paramHasAttr(0, Attribute::SExt);
1410   Out << "\n.method static ";
1411   Out << (F.hasLocalLinkage() ? "private " : "public ");
1412   if (F.isVarArg()) Out << "vararg ";
1413   Out << getTypeName(F.getReturnType(),isSigned) <<
1414     getConvModopt(F.getCallingConv()) << getValueName(&F) << '\n';
1415   // Arguments
1416   Out << "\t(";
1417   unsigned ArgIdx = 1;
1418   for (Function::const_arg_iterator I = F.arg_begin(), E = F.arg_end(); I!=E;
1419        ++I, ++ArgIdx) {
1420     isSigned = F.paramHasAttr(ArgIdx, Attribute::SExt);
1421     if (I!=F.arg_begin()) Out << ", ";
1422     Out << getTypeName(I->getType(),isSigned) << getValueName(I);
1423   }
1424   Out << ") cil managed\n";
1425   // Body
1426   Out << "{\n";
1427   printLocalVariables(F);
1428   printFunctionBody(F);
1429   Out << "}\n";
1430 }
1431
1432
1433 void MSILWriter::printDeclarations(const TypeSymbolTable& ST) {
1434   std::string Name;
1435   std::set<const Type*> Printed;
1436   for (std::set<const Type*>::const_iterator
1437        UI = UsedTypes->begin(), UE = UsedTypes->end(); UI!=UE; ++UI) {
1438     const Type* Ty = *UI;
1439     if (isa<ArrayType>(Ty) || isa<VectorType>(Ty) || isa<StructType>(Ty))
1440       Name = getTypeName(Ty, false, true);
1441     // Type with no need to declare.
1442     else continue;
1443     // Print not duplicated type
1444     if (Printed.insert(Ty).second) {
1445       Out << ".class value explicit ansi sealed '" << Name << "'";
1446       Out << " { .pack " << 1 << " .size " << TD->getTypePaddedSize(Ty);
1447       Out << " }\n\n";
1448     }
1449   }
1450 }
1451
1452
1453 unsigned int MSILWriter::getBitWidth(const Type* Ty) {
1454   unsigned int N = Ty->getPrimitiveSizeInBits();
1455   assert(N!=0 && "Invalid type in getBitWidth()");
1456   switch (N) {
1457   case 1:
1458   case 8:
1459   case 16:
1460   case 32:
1461   case 64:
1462     return N;
1463   default:
1464     cerr << "Bits = " << N << '\n';
1465     assert(0 && "Unsupported integer width");
1466   }
1467   return 0; // Not reached
1468 }
1469
1470
1471 void MSILWriter::printStaticConstant(const Constant* C, uint64_t& Offset) {
1472   uint64_t TySize = 0;
1473   const Type* Ty = C->getType();
1474   // Print zero initialized constant.
1475   if (isa<ConstantAggregateZero>(C) || C->isNullValue()) {
1476     TySize = TD->getTypePaddedSize(C->getType());
1477     Offset += TySize;
1478     Out << "int8 (0) [" << TySize << "]";
1479     return;
1480   }
1481   // Print constant initializer
1482   switch (Ty->getTypeID()) {
1483   case Type::IntegerTyID: {
1484     TySize = TD->getTypePaddedSize(Ty);
1485     const ConstantInt* Int = cast<ConstantInt>(C);
1486     Out << getPrimitiveTypeName(Ty,true) << "(" << Int->getSExtValue() << ")";
1487     break;
1488   }
1489   case Type::FloatTyID:
1490   case Type::DoubleTyID: {
1491     TySize = TD->getTypePaddedSize(Ty);
1492     const ConstantFP* FP = cast<ConstantFP>(C);
1493     if (Ty->getTypeID() == Type::FloatTyID)
1494       Out << "int32 (" <<
1495         (uint32_t)FP->getValueAPF().bitcastToAPInt().getZExtValue() << ')';
1496     else
1497       Out << "int64 (" <<
1498         FP->getValueAPF().bitcastToAPInt().getZExtValue() << ')';
1499     break;
1500   }
1501   case Type::ArrayTyID:
1502   case Type::VectorTyID:
1503   case Type::StructTyID:
1504     for (unsigned I = 0, E = C->getNumOperands(); I<E; I++) {
1505       if (I!=0) Out << ",\n";
1506       printStaticConstant(C->getOperand(I),Offset);
1507     }
1508     break;
1509   case Type::PointerTyID:
1510     TySize = TD->getTypePaddedSize(C->getType());
1511     // Initialize with global variable address
1512     if (const GlobalVariable *G = dyn_cast<GlobalVariable>(C)) {
1513       std::string name = getValueName(G);
1514       Out << "&(" << name.insert(name.length()-1,"$data") << ")";
1515     } else {
1516       // Dynamic initialization
1517       if (!isa<ConstantPointerNull>(C) && !C->isNullValue())
1518         InitListPtr->push_back(StaticInitializer(C,Offset));
1519       // Null pointer initialization
1520       if (TySize==4) Out << "int32 (0)";
1521       else if (TySize==8) Out << "int64 (0)";
1522       else assert(0 && "Invalid pointer size");
1523     }
1524     break;
1525   default:
1526     cerr << "TypeID = " << Ty->getTypeID() << '\n';
1527     assert(0 && "Invalid type in printStaticConstant()");
1528   }
1529   // Increase offset.
1530   Offset += TySize;
1531 }
1532
1533
1534 void MSILWriter::printStaticInitializer(const Constant* C,
1535                                         const std::string& Name) {
1536   switch (C->getType()->getTypeID()) {
1537   case Type::IntegerTyID:
1538   case Type::FloatTyID:
1539   case Type::DoubleTyID:
1540     Out << getPrimitiveTypeName(C->getType(), false);
1541     break;
1542   case Type::ArrayTyID:
1543   case Type::VectorTyID:
1544   case Type::StructTyID:
1545   case Type::PointerTyID:
1546     Out << getTypeName(C->getType());
1547     break;
1548   default:
1549     cerr << "Type = " << *C << "\n";
1550     assert(0 && "Invalid constant type");
1551   }
1552   // Print initializer
1553   std::string label = Name;
1554   label.insert(label.length()-1,"$data");
1555   Out << Name << " at " << label << '\n';
1556   Out << ".data " << label << " = {\n";
1557   uint64_t offset = 0;
1558   printStaticConstant(C,offset);
1559   Out << "\n}\n\n";
1560 }
1561
1562
1563 void MSILWriter::printVariableDefinition(const GlobalVariable* G) {
1564   const Constant* C = G->getInitializer();
1565   if (C->isNullValue() || isa<ConstantAggregateZero>(C) || isa<UndefValue>(C))
1566     InitListPtr = 0;
1567   else
1568     InitListPtr = &StaticInitList[G];
1569   printStaticInitializer(C,getValueName(G));
1570 }
1571
1572
1573 void MSILWriter::printGlobalVariables() {
1574   if (ModulePtr->global_empty()) return;
1575   Module::global_iterator I,E;
1576   for (I = ModulePtr->global_begin(), E = ModulePtr->global_end(); I!=E; ++I) {
1577     // Variable definition
1578     Out << ".field static " << (I->isDeclaration() ? "public " :
1579                                                      "private ");
1580     if (I->isDeclaration()) {
1581       Out << getTypeName(I->getType()) << getValueName(&*I) << "\n\n";
1582     } else
1583       printVariableDefinition(&*I);
1584   }
1585 }
1586
1587
1588 const char* MSILWriter::getLibraryName(const Function* F) {
1589   return getLibraryForSymbol(F->getName().c_str(), true, F->getCallingConv());
1590 }
1591
1592
1593 const char* MSILWriter::getLibraryName(const GlobalVariable* GV) {
1594   return getLibraryForSymbol(Mang->getValueName(GV).c_str(), false, 0);
1595 }
1596
1597
1598 const char* MSILWriter::getLibraryForSymbol(const char* Name, bool isFunction,
1599                                            unsigned CallingConv) {
1600   // TODO: Read *.def file with function and libraries definitions.
1601   return "MSVCRT.DLL";
1602 }
1603
1604
1605 void MSILWriter::printExternals() {
1606   Module::const_iterator I,E;
1607   // Functions.
1608   for (I=ModulePtr->begin(),E=ModulePtr->end(); I!=E; ++I) {
1609     // Skip intrisics
1610     if (I->isIntrinsic()) continue;
1611     if (I->isDeclaration()) {
1612       const Function* F = I;
1613       std::string Name = getConvModopt(F->getCallingConv())+getValueName(F);
1614       std::string Sig =
1615         getCallSignature(cast<FunctionType>(F->getFunctionType()), NULL, Name);
1616       Out << ".method static hidebysig pinvokeimpl(\""
1617           << getLibraryName(F) << "\")\n\t" << Sig << " preservesig {}\n\n";
1618     }
1619   }
1620   // External variables and static initialization.
1621   Out <<
1622   ".method public hidebysig static pinvokeimpl(\"KERNEL32.DLL\" ansi winapi)"
1623   "  native int LoadLibrary(string) preservesig {}\n"
1624   ".method public hidebysig static pinvokeimpl(\"KERNEL32.DLL\" ansi winapi)"
1625   "  native int GetProcAddress(native int, string) preservesig {}\n";
1626   Out <<
1627   ".method private static void* $MSIL_Import(string lib,string sym)\n"
1628   " managed cil\n{\n"
1629   "\tldarg\tlib\n"
1630   "\tcall\tnative int LoadLibrary(string)\n"
1631   "\tldarg\tsym\n"
1632   "\tcall\tnative int GetProcAddress(native int,string)\n"
1633   "\tdup\n"
1634   "\tbrtrue\tL_01\n"
1635   "\tldstr\t\"Can no import variable\"\n"
1636   "\tnewobj\tinstance void [mscorlib]System.Exception::.ctor(string)\n"
1637   "\tthrow\n"
1638   "L_01:\n"
1639   "\tret\n"
1640   "}\n\n"
1641   ".method static private void $MSIL_Init() managed cil\n{\n";
1642   printStaticInitializerList();
1643   // Foreach global variable.
1644   for (Module::global_iterator I = ModulePtr->global_begin(),
1645        E = ModulePtr->global_end(); I!=E; ++I) {
1646     if (!I->isDeclaration() || !I->hasDLLImportLinkage()) continue;
1647     // Use "LoadLibrary"/"GetProcAddress" to recive variable address.
1648     std::string Label = "not_null$_"+utostr(getUniqID());
1649     std::string Tmp = getTypeName(I->getType())+getValueName(&*I);
1650     printSimpleInstruction("ldsflda",Tmp.c_str());
1651     Out << "\tldstr\t\"" << getLibraryName(&*I) << "\"\n";
1652     Out << "\tldstr\t\"" << Mang->getValueName(&*I) << "\"\n";
1653     printSimpleInstruction("call","void* $MSIL_Import(string,string)");
1654     printIndirectSave(I->getType());
1655   }
1656   printSimpleInstruction("ret");
1657   Out << "}\n\n";
1658 }
1659
1660
1661 //===----------------------------------------------------------------------===//
1662 //                      External Interface declaration
1663 //===----------------------------------------------------------------------===//
1664
1665 bool MSILTarget::addPassesToEmitWholeFile(PassManager &PM, raw_ostream &o,
1666                                           CodeGenFileType FileType,
1667                                           CodeGenOpt::Level OptLevel)
1668 {
1669   if (FileType != TargetMachine::AssemblyFile) return true;
1670   MSILWriter* Writer = new MSILWriter(o);
1671   PM.add(createGCLoweringPass());
1672   PM.add(createLowerAllocationsPass(true));
1673   // FIXME: Handle switch trougth native IL instruction "switch"
1674   PM.add(createLowerSwitchPass());
1675   PM.add(createCFGSimplificationPass());
1676   PM.add(new MSILModule(Writer->UsedTypes,Writer->TD));
1677   PM.add(Writer);
1678   PM.add(createGCInfoDeleter());
1679   return false;
1680 }