Let the new backend begin!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35242 91177308-0d34-0410-b5e6-96231b3b80d8

5 files changed, 1596 insertions, 2 deletions

diff --git a/autoconf/configure.ac b/autoconf/configure.ac
index ad73185f96..7039e5d644 100644
--- a/autoconf/configure.ac
+++ b/autoconf/configure.ac
@@ -376,7 +376,7 @@ case "$enableval" in
   done 
   ;;
 esac
-TARGETS_TO_BUILD="CBackend $TARGETS_TO_BUILD"
+TARGETS_TO_BUILD="CBackend MSIL $TARGETS_TO_BUILD"
 AC_SUBST(TARGETS_TO_BUILD,$TARGETS_TO_BUILD)
 
 dnl Prevent the CBackend from using printf("%a") for floating point so older
diff --git a/configure b/configure
index 90f3e3a709..53b40f1f40 100755
--- a/configure
+++ b/configure
@@ -4730,7 +4730,7 @@ echo "$as_me: error: Unrecognized target $a_target" >&2;}
   done
   ;;
 esac
-TARGETS_TO_BUILD="CBackend $TARGETS_TO_BUILD"
+TARGETS_TO_BUILD="CBackend MSIL $TARGETS_TO_BUILD"
 TARGETS_TO_BUILD=$TARGETS_TO_BUILD
 
 
diff --git a/lib/Target/MSIL/MSILWriter.cpp b/lib/Target/MSIL/MSILWriter.cpp
new file mode 100644
index 0000000000..bab2904bd1
--- /dev/null
+++ b/lib/Target/MSIL/MSILWriter.cpp
@@ -0,0 +1,1350 @@
+//===-- MSILWriter.cpp - Library for converting LLVM code to MSIL ---------===//
+//
+//		       The LLVM Compiler Infrastructure
+//
+// This file was developed by Roman Samoilov and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This library converts LLVM code to MSIL code.
+//
+//===----------------------------------------------------------------------===//
+
+#include "MSILWriter.h"
+#include "llvm/CallingConv.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Intrinsics.h"
+#include "llvm/IntrinsicInst.h"
+#include "llvm/TypeSymbolTable.h"
+#include "llvm/Analysis/ConstantsScanner.h"
+#include "llvm/Support/CallSite.h"
+#include "llvm/Support/InstVisitor.h"
+#include "llvm/Transforms/Scalar.h"
+#include "llvm/ADT/StringExtras.h"
+
+namespace {
+  // TargetMachine for the MSIL 
+  struct VISIBILITY_HIDDEN MSILTarget : public TargetMachine {
+    const TargetData DataLayout;       // Calculates type size & alignment
+
+    MSILTarget(const Module &M, const std::string &FS)
+      : DataLayout(&M) {}
+
+    virtual bool WantsWholeFile() const { return true; }
+    virtual bool addPassesToEmitWholeFile(PassManager &PM, std::ostream &Out,
+                                         CodeGenFileType FileType, bool Fast);
+
+    // This class always works, but shouldn't be the default in most cases.
+    static unsigned getModuleMatchQuality(const Module &M) { return 1; }
+
+    virtual const TargetData *getTargetData() const { return &DataLayout; }
+  };
+}
+
+
+RegisterTarget<MSILTarget> X("msil", "  MSIL backend");
+
+bool MSILModule::runOnModule(Module &M) {
+  ModulePtr = &M;
+  TD = &getAnalysis<TargetData>();
+  bool Changed = false;
+  // Find named types.  
+  TypeSymbolTable& Table = M.getTypeSymbolTable();
+  std::set<const Type *> Types = getAnalysis<FindUsedTypes>().getTypes();
+  for (TypeSymbolTable::iterator I = Table.begin(), E = Table.end(); I!=E; ) {
+    if (!isa<StructType>(I->second) && !isa<OpaqueType>(I->second))
+      Table.remove(I++);
+    else {
+      std::set<const Type *>::iterator T = Types.find(I->second);
+      if (T==Types.end())
+        Table.remove(I++);
+      else {
+        Types.erase(T);
+        ++I;
+      }
+    }
+  }
+  // Find unnamed types.
+  unsigned RenameCounter = 0;
+  for (std::set<const Type *>::const_iterator I = Types.begin(),
+       E = Types.end(); I!=E; ++I)
+    if (const StructType *STy = dyn_cast<StructType>(*I)) {
+      while (ModulePtr->addTypeName("unnamed$"+utostr(RenameCounter), STy))
+        ++RenameCounter;
+      Changed = true;
+    }
+  // Pointer for FunctionPass.
+  UsedTypes = &getAnalysis<FindUsedTypes>().getTypes();
+  return Changed;
+}
+
+
+bool MSILWriter::runOnFunction(Function &F) {
+  if (F.isDeclaration()) return false;
+  LInfo = &getAnalysis<LoopInfo>();
+  printFunction(F);
+  return false;
+}
+
+
+bool MSILWriter::doInitialization(Module &M) {
+  ModulePtr = &M;
+  Mang = new Mangler(M); 
+  Out << ".assembly extern mscorlib {}\n";
+  Out << ".assembly MSIL {}\n\n";
+  Out << "// External\n";
+  printExternals();
+  Out << "// Declarations\n";
+  printDeclarations(M.getTypeSymbolTable());
+  Out << "// Definitions\n";
+  printGlobalVariables();
+  return false;
+}
+
+
+bool MSILWriter::doFinalization(Module &M) {
+  delete Mang;
+  return false;
+}
+
+
+bool MSILWriter::isZeroValue(const Value* V) {
+  if (const Constant *C = dyn_cast<Constant>(V))
+    return C->isNullValue();
+  return false;
+}
+
+
+std::string MSILWriter::getValueName(const Value* V) {
+  // Name into the quotes allow control and space characters.
+  return "'"+Mang->getValueName(V)+"'";
+}
+
+
+std::string MSILWriter::getLabelName(const std::string& Name) {
+  if (Name.find('.')!=std::string::npos) {
+    std::string Tmp(Name);
+    // Replace unaccepable characters in the label name.
+    for (std::string::iterator I = Tmp.begin(), E = Tmp.end(); I!=E; ++I)
+      if (*I=='.') *I = '@';
+    return Tmp;
+  }
+  return Name;
+}
+
+
+std::string MSILWriter::getLabelName(const Value* V) {
+  return getLabelName(Mang->getValueName(V));
+}
+
+
+std::string MSILWriter::getConvModopt(unsigned CallingConvID) {
+  switch (CallingConvID) {
+  case CallingConv::C:
+  case CallingConv::Cold:
+  case CallingConv::Fast:
+    return "modopt([mscorlib]System.Runtime.CompilerServices.CallConvCdecl) ";
+  case CallingConv::X86_FastCall:
+    return "modopt([mscorlib]System.Runtime.CompilerServices.CallConvFastcall) ";
+  case CallingConv::X86_StdCall:
+    return "modopt([mscorlib]System.Runtime.CompilerServices.CallConvStdcall) ";
+  default:
+    cerr << "CallingConvID = " << CallingConvID << '\n';
+    assert(0 && "Unsupported calling convention");
+  }
+}
+
+
+std::string MSILWriter::getArrayTypeName(Type::TypeID TyID, const Type* Ty) {
+  std::string Tmp = "";
+  const Type* ElemTy = Ty;
+  assert(Ty->getTypeID()==TyID && "Invalid type passed");
+  // Walk trought array element types.
+  for (;;) {
+    // Multidimensional array.
+    if (ElemTy->getTypeID()==TyID) {
+      if (const ArrayType* ATy = dyn_cast<ArrayType>(ElemTy))
+        Tmp += utostr(ATy->getNumElements());
+      else if (const VectorType* VTy = dyn_cast<VectorType>(ElemTy))
+        Tmp += utostr(VTy->getNumElements());
+      ElemTy = cast<SequentialType>(ElemTy)->getElementType();
+    }
+    // Base element type found.
+    if (ElemTy->getTypeID()!=TyID) break;
+    Tmp += ",";
+  }
+  return getTypeName(ElemTy)+"["+Tmp+"]";
+}
+
+
+std::string MSILWriter::getPrimitiveTypeName(const Type* Ty, bool isSigned) {
+  unsigned NumBits = 0;
+  switch (Ty->getTypeID()) {
+  case Type::VoidTyID:
+    return "void ";
+  case Type::IntegerTyID:
+    NumBits = getBitWidth(Ty);
+    if(NumBits==1)
+      return "bool ";
+    if (!isSigned)
+      return "unsigned int"+utostr(NumBits)+" ";
+    return "int"+utostr(NumBits)+" ";
+  case Type::FloatTyID:
+    return "float32 ";
+  case Type::DoubleTyID:
+    return "float64 "; 
+  default:
+    cerr << "Type = " << *Ty << '\n';
+    assert(0 && "Invalid primitive type");
+  }
+}
+
+
+std::string MSILWriter::getTypeName(const Type* Ty, bool isSigned) {
+  if (Ty->isPrimitiveType() || Ty->isInteger())
+    return getPrimitiveTypeName(Ty,isSigned);
+  // FIXME: "OpaqueType" support
+  switch (Ty->getTypeID()) {
+  case Type::PointerTyID:
+    return "void* ";
+  case Type::StructTyID:
+    return "valuetype '"+ModulePtr->getTypeName(Ty)+"' ";
+  case Type::ArrayTyID:
+    return "valuetype '"+getArrayTypeName(Ty->getTypeID(),Ty)+"' ";
+  case Type::VectorTyID:
+    return "valuetype '"+getArrayTypeName(Ty->getTypeID(),Ty)+"' ";
+  default:
+    cerr << "Type = " << *Ty << '\n';
+    assert(0 && "Invalid type in getTypeName()");
+  }
+}
+
+
+MSILWriter::ValueType MSILWriter::getValueLocation(const Value* V) {
+  // Function argument
+  if (isa<Argument>(V))
+    return ArgumentVT;
+  // Function
+  else if (const Function* F = dyn_cast<Function>(V))
+    return F->hasInternalLinkage() ? InternalVT : GlobalVT;
+  // Variable
+  else if (const GlobalVariable* G = dyn_cast<GlobalVariable>(V))
+    return G->hasInternalLinkage() ? InternalVT : GlobalVT;
+  // Constant
+  else if (isa<Constant>(V))
+    return isa<ConstantExpr>(V) ? ConstExprVT : ConstVT;
+  // Local variable
+  return LocalVT;
+}
+
+
+std::string MSILWriter::getTypePostfix(const Type* Ty, bool Expand,
+                                       bool isSigned) {
+  unsigned NumBits = 0;
+  switch (Ty->getTypeID()) {
+  // Integer constant, expanding for stack operations.
+  case Type::IntegerTyID:
+    NumBits = getBitWidth(Ty);
+    // Expand integer value to "int32" or "int64".
+    if (Expand) return (NumBits<=32 ? "i4" : "i8");
+    if (NumBits==1) return "i1";
+    return (isSigned ? "i" : "u")+utostr(NumBits/8);
+  // Float constant.
+  case Type::FloatTyID:
+    return "r4";
+  case Type::DoubleTyID:
+    return "r8";
+  case Type::PointerTyID:
+    return "i"+utostr(TD->getTypeSize(Ty));
+  default:
+    cerr << "TypeID = " << Ty->getTypeID() << '\n';
+    assert(0 && "Invalid type in TypeToPostfix()");
+  }
+}
+
+
+void MSILWriter::printPtrLoad(uint64_t N) {
+  switch (ModulePtr->getPointerSize()) {
+  case Module::Pointer32:
+    printSimpleInstruction("ldc.i4",utostr(N).c_str());
+    // FIXME: Need overflow test?
+    assert(N<0xFFFFFFFF && "32-bit pointer overflowed");
+    break;
+  case Module::Pointer64:
+    printSimpleInstruction("ldc.i8",utostr(N).c_str());
+    break;
+  default:
+    assert(0 && "Module use not supporting pointer size");
+  }
+}
+
+
+void MSILWriter::printConstLoad(const Constant* C) {
+  if (const ConstantInt* CInt = dyn_cast<ConstantInt>(C)) {
+    // Integer constant
+    Out << "\tldc." << getTypePostfix(C->getType(),true) << '\t';
+    if (CInt->isMinValue(true))
+      Out << CInt->getSExtValue();
+    else
+      Out << CInt->getZExtValue();
+  } else if (const ConstantFP* CFp = dyn_cast<ConstantFP>(C)) {
+    // Float constant
+    Out << "\tldc." << getTypePostfix(C->getType(),true) << '\t' <<
+      CFp->getValue();
+  } else {
+    cerr << "Constant = " << *C << '\n';
+    assert(0 && "Invalid constant value");
+  }
+  Out << '\n';
+}
+
+
+void MSILWriter::printValueLoad(const Value* V) {
+  switch (getValueLocation(V)) {
+  // Global variable or function address.
+  case GlobalVT:
+  case InternalVT:
+    if (const Function* F = dyn_cast<Function>(V)) {
+      std::string Name = getConvModopt(F->getCallingConv())+getValueName(F);
+      printSimpleInstruction("ldftn",
+        getCallSignature(F->getFunctionType(),NULL,Name).c_str());
+    } else {
+      const Type* ElemTy = cast<PointerType>(V->getType())->getElementType();
+      std::string Tmp = getTypeName(ElemTy)+getValueName(V);
+      printSimpleInstruction("ldsflda",Tmp.c_str());
+    }
+    break;
+  // Function argument.
+  case ArgumentVT:
+    printSimpleInstruction("ldarg",getValueName(V).c_str());
+    break;
+  // Local function variable.
+  case LocalVT:
+    printSimpleInstruction("ldloc",getValueName(V).c_str());
+    break;
+  // Constant value.
+  case ConstVT:
+    if (isa<ConstantPointerNull>(V))
+      printPtrLoad(0);
+    else
+      printConstLoad(cast<Constant>(V));
+    break;
+  // Constant expression.
+  case ConstExprVT:
+    printConstantExpr(cast<ConstantExpr>(V));
+    break;
+  default:
+    cerr << "Value = " << *V << '\n';
+    assert(0 && "Invalid value location");
+  }
+}
+
+
+void MSILWriter::printValueSave(const Value* V) {
+  switch (getValueLocation(V)) {
+  case ArgumentVT:
+    printSimpleInstruction("starg",getValueName(V).c_str());
+    break;
+  case LocalVT:
+    printSimpleInstruction("stloc",getValueName(V).c_str());
+    break;
+  default:
+    cerr << "Value  = " << *V << '\n';
+    assert(0 && "Invalid value location");
+  }
+}
+
+
+void MSILWriter::printBinaryInstruction(const char* Name, const Value* Left,
+                                        const Value* Right) {
+  printValueLoad(Left);
+  printValueLoad(Right);
+  Out << '\t' << Name << '\n';
+}
+
+
+void MSILWriter::printSimpleInstruction(const char* Inst, const char* Operand) {
+  if(Operand) 
+    Out << '\t' << Inst << '\t' << Operand << '\n';
+  else
+    Out << '\t' << Inst << '\n';
+}
+
+
+void MSILWriter::printPHICopy(const BasicBlock* Src, const BasicBlock* Dst) {
+  for (BasicBlock::const_iterator I = Dst->begin(), E = Dst->end();
+       isa<PHINode>(I); ++I) {
+    const PHINode* Phi = cast<PHINode>(I);
+    const Value* Val = Phi->getIncomingValueForBlock(Src);
+    if (isa<UndefValue>(Val)) continue;
+    printValueLoad(Val);
+    printValueSave(Phi);
+  }
+}
+
+
+void MSILWriter::printBranchToBlock(const BasicBlock* CurrBB,
+                                    const BasicBlock* TrueBB,
+                                    const BasicBlock* FalseBB) {
+  if (TrueBB==FalseBB) {
+    // "TrueBB" and "FalseBB" destination equals
+    printPHICopy(CurrBB,TrueBB);
+    printSimpleInstruction("pop");
+    printSimpleInstruction("br",getLabelName(TrueBB).c_str());
+  } else if (FalseBB==NULL) {
+    // If "FalseBB" not used the jump have condition
+    printPHICopy(CurrBB,TrueBB);
+    printSimpleInstruction("brtrue",getLabelName(TrueBB).c_str());
+  } else if (TrueBB==NULL) {
+    // If "TrueBB" not used the jump is unconditional
+    printPHICopy(CurrBB,FalseBB);
+    printSimpleInstruction("br",getLabelName(FalseBB).c_str());
+  } else {
+    // Copy PHI instructions for each block
+    std::string TmpLabel;
+    // Print PHI instructions for "TrueBB"
+    if (isa<PHINode>(TrueBB->begin())) {
+      TmpLabel = getLabelName(TrueBB)+"$phi_"+utostr(getUniqID());
+      printSimpleInstruction("brtrue",TmpLabel.c_str());
+    } else {
+      printSimpleInstruction("brtrue",getLabelName(TrueBB).c_str());
+    }
+    // Print PHI instructions for "FalseBB"
+    if (isa<PHINode>(FalseBB->begin())) {
+      printPHICopy(CurrBB,FalseBB);
+      printSimpleInstruction("br",getLabelName(FalseBB).c_str());
+    } else {
+      printSimpleInstruction("br",getLabelName(FalseBB).c_str());
+    }
+    if (isa<PHINode>(TrueBB->begin())) {
+      // Handle "TrueBB" PHI Copy
+      Out << TmpLabel << ":\n";
+      printPHICopy(CurrBB,TrueBB);
+      printSimpleInstruction("br",getLabelName(TrueBB).c_str());
+    }
+  }
+}
+
+
+void MSILWriter::printBranchInstruction(const BranchInst* Inst) {
+  if (Inst->isUnconditional()) {
+    printBranchToBlock(Inst->getParent(),NULL,Inst->getSuccessor(0));
+  } else {
+    printValueLoad(Inst->getCondition());
+    printBranchToBlock(Inst->getParent(),Inst->getSuccessor(0),
+                       Inst->getSuccessor(1));
+  }
+}
+
+
+void MSILWriter::printSelectInstruction(const Value* Cond, const Value* VTrue,
+                                        const Value* VFalse) {
+  std::string TmpLabel = std::string("select$true_")+utostr(getUniqID());
+  printValueLoad(VTrue);
+  printValueLoad(Cond);
+  printSimpleInstruction("brtrue",TmpLabel.c_str());
+  printSimpleInstruction("pop");
+  printValueLoad(VFalse);
+  Out << TmpLabel << ":\n";
+}
+
+
+void MSILWriter::printIndirectLoad(const Value* V) {
+  printValueLoad(V);
+  std::string Tmp = "ldind."+getTypePostfix(V->getType(),false);
+  printSimpleInstruction(Tmp.c_str());
+}
+
+
+void MSILWriter::printStoreInstruction(const Instruction* Inst) {
+  const Value* Val = Inst->getOperand(0);
+  const Value* Ptr = Inst->getOperand(1);
+  // Load destination address.
+  printValueLoad(Ptr);
+  // Load value.
+  printValueLoad(Val);
+  // Instruction need signed postfix for any type.
+  std::string postfix = getTypePostfix(Val->getType(),false);
+  if (*postfix.begin()=='u') *postfix.begin() = 'i';
+  postfix = "stind."+postfix;
+  printSimpleInstruction(postfix.c_str());
+}
+
+
+void MSILWriter::printCastInstruction(unsigned int Op, const Value* V,
+                                      const Type* Ty) {
+  std::string Tmp("");
+  printValueLoad(V);
+  switch (Op) {
+  // Signed
+  case Instruction::SExt:
+  case Instruction::SIToFP:
+  case Instruction::FPToSI:
+    Tmp = "conv."+getTypePostfix(Ty,false,true);
+    printSimpleInstruction(Tmp.c_str());
+    break;
+  // Unsigned
+  case Instruction::FPTrunc:
+  case Instruction::FPExt:
+  case Instruction::UIToFP:
+  case Instruction::Trunc:
+  case Instruction::ZExt:
+  case Instruction::FPToUI:
+  case Instruction::PtrToInt:
+  case Instruction::IntToPtr:
+    Tmp = "conv."+getTypePostfix(Ty,false);
+    printSimpleInstruction(Tmp.c_str());
+    break;
+  // Do nothing
+  case Instruction::BitCast:
+    // FIXME: meaning that ld*/st* instruction do not change data format.
+    break;
+  default:
+    cerr << "Opcode = " << Op << '\n';
+    assert(0 && "Invalid conversion instruction");
+  }
+}
+
+
+void MSILWriter::printGepInstruction(const Value* V, gep_type_iterator I,
+                                     gep_type_iterator E) {
+  // Load address
+  printValueLoad(V);
+  // Calculate element offset.
+  unsigned TySize;
+  for (++I; I!=E; ++I){
+    const Type* Ty = I.getIndexedType();
+    const Value* Idx = I.getOperand();
+    // Get size of type.
+    switch (Ty->getTypeID()) {
+    case Type::IntegerTyID:
+    case Type::FloatTyID:
+    case Type::DoubleTyID:
+    case Type::PointerTyID:
+      TySize = TD->getTypeSize(Ty);
+      break;
+    case Type::StructTyID:
+      TySize = 0;
+      break;
+    case Type::ArrayTyID:
+      TySize = TD->getTypeSize(cast<ArrayType>(Ty)->getElementType());
+      break;
+    case Type::VectorTyID:
+      TySize = TD->getTypeSize(cast<VectorType>(Ty)->getElementType());
+      break;
+    default:
+      cerr << "Type = " << *Ty << '\n';
+      assert(0 && "Invalid index type in printGepInstruction()");
+    }
+    // Calculate offset to structure field.
+    if (const StructType* STy = dyn_cast<StructType>(Ty)) {
+      TySize = 0;
+      uint64_t FieldIdx = cast<ConstantInt>(Idx)->getZExtValue();
+      // Offset is the summ of all previous structure fields.
+      for (uint64_t F = 0; F<FieldIdx; ++F)
+        TySize += TD->getTypeSize(STy->getContainedType(unsigned(F)));
+      // Add field offset to stack top.
+      printPtrLoad(TySize);
+      printSimpleInstruction("add");
+      continue;
+    }
+    // Add offset of current element to stack top.
+    if (!isZeroValue(Idx)) {
+      uint64_t TySize = TD->getTypeSize(I.getIndexedType());
+      // Constant optimization
+      if (const ConstantInt* CInt = dyn_cast<ConstantInt>(Idx)) {
+        printPtrLoad(CInt->getZExtValue()*TySize);
+      } else {
+        printPtrLoad(TySize);
+        printValueLoad(Idx);
+        printSimpleInstruction("mul");
+      }
+      printSimpleInstruction("add");
+    }
+  }
+}
+
+
+std::string MSILWriter::getCallSignature(const FunctionType* Ty,
+                                         const Instruction* Inst,
+                                         std::string Name) {
+  std::string Tmp = "";
+  if (Ty->isVarArg()) Tmp += "vararg ";
+  // Name and return type.
+  Tmp += getTypeName(Ty->getReturnType())+Name+"(";
+  // Function argument type list.
+  unsigned NumParams = Ty->getNumParams();
+  for (unsigned I = 0; I!=NumParams; ++I) {
+    if (I!=0) Tmp += ",";
+    Tmp += getTypeName(Ty->getParamType(I));
+  }
+  // CLR needs to know the exact amount of parameters received by vararg
+  // function, because caller cleans the stack.
+  if (Ty->isVarArg() && Inst) {
+    // Origin to function arguments in "CallInst" or "InvokeInst"
+    unsigned Org = isa<InvokeInst>(Inst) ? 3 : 1;
+    // Print variable argument types.
+    unsigned NumOperands = Inst->getNumOperands()-Org;
+    if (NumParams<NumOperands) {
+      if (NumParams!=0) Tmp += ", ";
+      Tmp += "... , ";
+      for (unsigned J = NumParams; J!=NumOperands; ++J) {
+        if (J!=NumParams) Tmp += ", ";
+        Tmp += getTypeName(Inst->getOperand(J+Org)->getType());
+      }
+    }
+  }
+  return Tmp+")";
+}
+
+
+void MSILWriter::printFunctionCall(const Value* FnVal,
+                                   const Instruction* Inst) {
+  // Get function calling convention
+  std::string Name = "";
+  if (const CallInst* Call = dyn_cast<CallInst>(Inst))
+    Name = getConvModopt(Call->getCallingConv());
+  else if (const InvokeInst* Invoke = dyn_cast<InvokeInst>(Inst))
+    Name = getConvModopt(Invoke->getCallingConv());
+  else {
+    cerr << "Instruction = " << Inst->getName() << '\n';
+    assert(0 && "Need \"Invoke\" or \"Call\" instruction only");
+  }
+  
+  if (const Function* F = dyn_cast<Function>(FnVal)) {
+    // Direct call
+    Name += getValueName(F);
+    printSimpleInstruction("call",
+      getCallSignature(F->getFunctionType(),Inst,Name).c_str());
+  } else {
+    // Indirect function call
+    const PointerType* PTy = cast<PointerType>(FnVal->getType());
+    const FunctionType* FTy = cast<FunctionType>(PTy->getElementType());
+    // Load function address
+    printValueLoad(FnVal);
+    printSimpleInstruction("calli",getCallSignature(FTy,Inst,Name).c_str());
+  }
+}
+
+
+void MSILWriter::printCallInstruction(const Instruction* Inst) {
+  // Load arguments to stack
+  for (int I = 1, E = Inst->getNumOperands(); I!=E; ++I)
+    printValueLoad(Inst->getOperand(I));
+  printFunctionCall(Inst->getOperand(0),Inst);
+}
+
+
+void MSILWriter::printICmpInstruction(unsigned Predicate, const Value* Left,
+                                      const Value* Right) {
+  switch (Predicate) {
+  case ICmpInst::ICMP_EQ:
+    printBinaryInstruction("ceq",Left,Right);
+    break;
+  case ICmpInst::ICMP_NE:
+    // Emulate = not (Op1 eq Op2)
+    printBinaryInstruction("ceq",Left,Right);
+    printSimpleInstruction("not");
+    break;
+  case ICmpInst::ICMP_ULE:
+  case ICmpInst::ICMP_SLE:
+    // Emulate = (Op1 eq Op2) or (Op1 lt Op2)
+    printBinaryInstruction("ceq",Left,Right);
+    if (Predicate==ICmpInst::ICMP_ULE)
+      printBinaryInstruction("clt.un",Left,Right);
+    else
+      printBinaryInstruction("clt",Left,Right);
+    printSimpleInstruction("or");
+    break;
+  case ICmpInst::ICMP_UGE:
+  case ICmpInst::ICMP_SGE:
+    // Emulate = (Op1 eq Op2) or (Op1 gt Op2)
+    printBinaryInstruction("ceq",Left,Right);
+    if (Predicate==ICmpInst::ICMP_UGE)
+      printBinaryInstruction("cgt.un",Left,Right);
+    else
+      printBinaryInstruction("cgt",Left,Right);
+    printSimpleInstruction("or");
+    break;
+  case ICmpInst::ICMP_ULT:
+    printBinaryInstruction("clt.un",Left,Right);
+    break;
+  case ICmpInst::ICMP_SLT:
+    printBinaryInstruction("clt",Left,Right);
+    break;
+  case ICmpInst::ICMP_UGT:
+    printBinaryInstruction("cgt.un",Left,Right);
+  case ICmpInst::ICMP_SGT:
+    printBinaryInstruction("cgt",Left,Right);
+    break;
+  default:
+    cerr << "Predicate = " << Predicate << '\n';
+    assert(0 && "Invalid icmp predicate");
+  }
+}
+
+
+void MSILWriter::printFCmpInstruction(unsigned Predicate, const Value* Left,
+                                      const Value* Right) {
+  // FIXME: Correct comparison
+  std::string NanFunc = "bool [mscorlib]System.Double::IsNaN(float64)";
+  switch (Predicate) {
+  case FCmpInst::FCMP_UGT:
+    // X >  Y || llvm_fcmp_uno(X, Y)
+    printBinaryInstruction("cgt",Left,Right);
+    printFCmpInstruction(FCmpInst::FCMP_UNO,Left,Right);
+    printSimpleInstruction("or");
+    break;
+  case FCmpInst::FCMP_OGT:
+    // X >  Y
+    printBinaryInstruction("cgt",Left,Right);
+    break;
+  case FCmpInst::FCMP_UGE:
+    // X >= Y || llvm_fcmp_uno(X, Y)
+    printBinaryInstruction("ceq",Left,Right);
+    printBinaryInstruction("cgt",Left,Right);
+    printSimpleInstruction("or");
+    printFCmpInstruction(FCmpInst::FCMP_UNO,Left,Right);
+    printSimpleInstruction("or");
+    break;
+  case FCmpInst::FCMP_OGE:
+    // X >= Y
+    printBinaryInstruction("ceq",Left,Right);
+    printBinaryInstruction("cgt",Left,Right);
+    printSimpleInstruction("or");
+    break;
+  case FCmpInst::FCMP_ULT:
+    // X <  Y || llvm_fcmp_uno(X, Y)
+    printBinaryInstruction("clt",Left,Right);
+    printFCmpInstruction(FCmpInst::FCMP_UNO,Left,Right);
+    printSimpleInstruction("or");
+    break;
+  case FCmpInst::FCMP_OLT:
+    // X <  Y
+    printBinaryInstruction("clt",Left,Right);
+    break;
+  case FCmpInst::FCMP_ULE:
+    // X <= Y || llvm_fcmp_uno(X, Y)
+    printBinaryInstruction("ceq",Left,Right);
+    printBinaryInstruction("clt",Left,Right);
+    printSimpleInstruction("or");
+    printFCmpInstruction(FCmpInst::FCMP_UNO,Left,Right);
+    printSimpleInstruction("or");
+    break;
+  case FCmpInst::FCMP_OLE:
+    // X <= Y
+    printBinaryInstruction("ceq",Left,Right);
+    printBinaryInstruction("clt",Left,Right);
+    printSimpleInstruction("or");
+    break;
+  case FCmpInst::FCMP_UEQ:
+    // X == Y || llvm_fcmp_uno(X, Y)
+    printBinaryInstruction("ceq",Left,Right);
+    printFCmpInstruction(FCmpInst::FCMP_UNO,Left,Right);
+    printSimpleInstruction("or");
+    break;
+  case FCmpInst::FCMP_OEQ:
+    // X == Y
+    printBinaryInstruction("ceq",Left,Right);
+    break;
+  case FCmpInst::FCMP_UNE:
+    // X != Y
+    printBinaryInstruction("ceq",Left,Right);
+    printSimpleInstruction("not");
+    break;
+  case FCmpInst::FCMP_ONE:
+    // X != Y && llvm_fcmp_ord(X, Y)
+    printBinaryInstruction("ceq",Left,Right);
+    printSimpleInstruction("not");
+    break;
+  case FCmpInst::FCMP_ORD:
+    // return X == X && Y == Y
+    printBinaryInstruction("ceq",Left,Left);
+    printBinaryInstruction("ceq",Right,Right);
+    printSimpleInstruction("or");
+    break;
+  case FCmpInst::FCMP_UNO:
+    // X != X || Y != Y
+    printBinaryInstruction("ceq",Left,Left);
+    printSimpleInstruction("not");
+    printBinaryInstruction("ceq",Right,Right);
+    printSimpleInstruction("not");
+    printSimpleInstruction("or");
+    break;
+  default:
+    assert(0 && "Illegal FCmp predicate");
+  }
+}
+
+
+void MSILWriter::printInvokeInstruction(const InvokeInst* Inst) {
+  std::string Label = "leave$normal_"+utostr(getUniqID());
+  Out << ".try {\n";
+  // Load arguments
+  for (int I = 3, E = Inst->getNumOperands(); I!=E; ++I)
+    printValueLoad(Inst->getOperand(I));
+  // Print call instruction
+  printFunctionCall(Inst->getOperand(0),Inst);
+  // Save function result and leave "try" block
+  printValueSave(Inst);
+  printSimpleInstruction("leave",Label.c_str());
+  Out << "}\n";
+  Out << "catch [mscorlib]System.Exception {\n";
+  // Redirect to unwind block
+  printSimpleInstruction("pop");
+  printBranchToBlock(Inst->getParent(),NULL,Inst->getUnwindDest());
+  Out << "}\n" << Label << ":\n";
+  // Redirect to continue block
+  printBranchToBlock(Inst->getParent(),NULL,Inst->getNormalDest());
+}
+
+
+void MSILWriter::printSwitchInstruction(const SwitchInst* Inst) {
+  // FIXME: Emulate with IL "switch" instruction
+  // Emulate = if () else if () else if () else ...
+  for (unsigned int I = 1, E = Inst->getNumCases(); I!=E; ++I) {
+    printValueLoad(Inst->getCondition());
+    printValueLoad(Inst->getCaseValue(I));
+    printSimpleInstruction("ceq");
+    // Condition jump to successor block
+    printBranchToBlock(Inst->getParent(),Inst->getSuccessor(I),NULL);
+  }
+  // Jump to default block
+  printBranchToBlock(Inst->getParent(),NULL,Inst->getDefaultDest());
+}
+
+
+void MSILWriter::printInstruction(const Instruction* Inst) {
+  const Value *Left = 0, *Right = 0;
+  if (Inst->getNumOperands()>=1) Left = Inst->getOperand(0);
+  if (Inst->getNumOperands()>=2) Right = Inst->getOperand(1);
+  // Print instruction
+  // FIXME: "ShuffleVector","ExtractElement","InsertElement","VAArg" support.
+  switch (Inst->getOpcode()) {
+  // Terminator
+  case Instruction::Ret:
+    if (Inst->getNumOperands()) {
+      printValueLoad(Left);
+      printSimpleInstruction("ret");
+    } else
+      printSimpleInstruction("ret");
+    break;
+  case Instruction::Br:
+    printBranchInstruction(cast<BranchInst>(Inst));
+    break;
+  // Binary
+  case Instruction::Add:
+    printBinaryInstruction("add",Left,Right);
+    break;
+  case Instruction::Sub:
+    printBinaryInstruction("sub",Left,Right);
+    break;
+  case Instruction::Mul:  
+    printBinaryInstruction("mul",Left,Right);
+    break;
+  case Instruction::UDiv:
+    printBinaryInstruction("div.un",Left,Right);
+    break;
+  case Instruction::SDiv:
+  case Instruction::FDiv:
+    printBinaryInstruction("div",Left,Right);
+    break;
+  case Instruction::URem:
+    printBinaryInstruction("rem.un",Left,Right);
+    break;
+  case Instruction::SRem:
+  case Instruction::FRem:
+    printBinaryInstruction("rem",Left,Right);
+    break;
+  // Binary Condition
+  case Instruction::ICmp:
+    printICmpInstruction(cast<ICmpInst>(Inst)->getPredicate(),Left,Right);
+    break;
+  case Instruction::FCmp:
+    printFCmpInstruction(cast<FCmpInst>(Inst)->getPredicate(),Left,Right);
+    break;
+  // Bitwise Binary
+  case Instruction::And:
+    printBinaryInstruction("and",Left,Right);
+    break;
+  case Instruction::Or:
+    printBinaryInstruction("or",Left,Right);
+    break;
+  case Instruction::Xor:
+    printBinaryInstruction("xor",Left,Right);
+    break;
+  case Instruction::Shl:
+    printBinaryInstruction("shl",Left,Right);
+    break;
+  case Instruction::LShr:
+    printBinaryInstruction("shr.un",Left,Right);
+    break;
+  case Instruction::AShr:
+    printBinaryInstruction("shr",Left,Right);
+    break;
+  case Instruction::Select:
+    printSelectInstruction(Inst->getOperand(0),Inst->getOperand(1),Inst->getOperand(2));
+    break;
+  case Instruction::Load:
+    printIndirectLoad(Inst->getOperand(0));
+    break;
+  case Instruction::Store:
+    printStoreInstruction(Inst);
+    break;
+  case Instruction::Trunc:
+  case Instruction::ZExt:
+  case Instruction::SExt:
+  case Instruction::FPTrunc:
+  case Instruction::FPExt:
+  case Instruction::UIToFP:
+  case Instruction::SIToFP:
+  case Instruction::FPToUI:
+  case Instruction::FPToSI:
+  case Instruction::PtrToInt:
+  case Instruction::IntToPtr:
+  case Instruction::BitCast:
+    printCastInstruction(Inst->getOpcode(),Left,
+                         cast<CastInst>(Inst)->getDestTy());
+    break;
+  case Instruction::GetElementPtr:
+    printGepInstruction(Inst->getOperand(0),gep_type_begin(Inst),
+                        gep_type_end(Inst));
+    break;
+  case Instruction::Call:
+    printCallInstruction(cast<CallInst>(Inst));
+    break;
+  case Instruction::Invoke:
+    printInvokeInstruction(cast<InvokeInst>(Inst));
+    break;
+  case Instruction::Unwind: {
+    std::string Class = "instance void [mscorlib]System.Exception::.ctor()";
+    printSimpleInstruction("newobj",Class.c_str());
+    printSimpleInstruction("throw");
+    break;
+  }
+  case Instruction::Switch:
+    printSwitchInstruction(cast<SwitchInst>(Inst));
+    break;
+  case Instruction::Alloca:
+    printValueLoad(Inst->getOperand(0));
+    printSimpleInstruction("localloc");
+    break;
+  case Instruction::Malloc:
+    assert(0 && "LowerAllocationsPass used");
+    break;
+  case Instruction::Free:
+    assert(0 && "LowerAllocationsPass used");
+    break;
+  case Instruction::Unreachable:
+    printSimpleInstruction("ldnull");
+    printSimpleInstruction("throw");
+    break;
+  default:
+    cerr << "Instruction = " << Inst->getName() << '\n';
+    assert(0 && "Unsupported instruction");
+  }
+}
+
+
+void MSILWriter::printLoop(const Loop* L) {
+  Out << getLabelName(L->getHeader()->getName()) << ":\n";
+  const std::vector<BasicBlock*>& blocks = L->getBlocks();
+  for (unsigned I = 0, E = blocks.size(); I!=E; I++) {
+    BasicBlock* BB = blocks[I];
+    Loop* BBLoop = LInfo->getLoopFor(BB);
+    if (BBLoop == L)
+      printBasicBlock(BB);
+    else if (BB==BBLoop->getHeader() && BBLoop->getParentLoop()==L)
+      printLoop(BBLoop);
+  }
+  printSimpleInstruction("br",getLabelName(L->getHeader()->getName()).c_str());
+}
+
+
+void MSILWriter::printBasicBlock(const BasicBlock* BB) {
+  Out << getLabelName(BB) << ":\n";
+  for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I!=E; ++I) {
+    const Instruction* Inst = I;
+    // Comment llvm original instruction
+    Out << "\n//" << *Inst << "\n";
+    // Do not handle PHI instruction in current block
+    if (Inst->getOpcode()==Instruction::PHI) continue;
+    // Print instruction
+    printInstruction(Inst);
+    // Save result
+    if (