Import Clang, at r72732.vendor/clang/clang-r72732

1 files changed, 588 insertions, 0 deletions

diff --git a/lib/CodeGen/CGExprConstant.cpp b/lib/CodeGen/CGExprConstant.cpp
new file mode 100644
index 000000000000..b30bafb51051
--- /dev/null
+++ b/lib/CodeGen/CGExprConstant.cpp
@@ -0,0 +1,588 @@
+//===--- CGExprConstant.cpp - Emit LLVM Code from Constant Expressions ----===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This contains code to emit Constant Expr nodes as LLVM code.
+//
+//===----------------------------------------------------------------------===//
+
+#include "CodeGenFunction.h"
+#include "CodeGenModule.h"
+#include "CGObjCRuntime.h"
+#include "clang/AST/APValue.h"
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/StmtVisitor.h"
+#include "llvm/Constants.h"
+#include "llvm/Function.h"
+#include "llvm/GlobalVariable.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Target/TargetData.h"
+using namespace clang;
+using namespace CodeGen;
+
+namespace  {
+class VISIBILITY_HIDDEN ConstExprEmitter : 
+  public StmtVisitor<ConstExprEmitter, llvm::Constant*> {
+  CodeGenModule &CGM;
+  CodeGenFunction *CGF;
+public:
+  ConstExprEmitter(CodeGenModule &cgm, CodeGenFunction *cgf)
+    : CGM(cgm), CGF(cgf) {
+  }
+    
+  //===--------------------------------------------------------------------===//
+  //                            Visitor Methods
+  //===--------------------------------------------------------------------===//
+    
+  llvm::Constant *VisitStmt(Stmt *S) {
+    return 0;
+  }
+  
+  llvm::Constant *VisitParenExpr(ParenExpr *PE) { 
+    return Visit(PE->getSubExpr()); 
+  }
+    
+  llvm::Constant *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {
+    return Visit(E->getInitializer());
+  }
+  
+  llvm::Constant *VisitCastExpr(CastExpr* E) {
+    // GCC cast to union extension
+    if (E->getType()->isUnionType()) {
+      const llvm::Type *Ty = ConvertType(E->getType());
+      Expr *SubExpr = E->getSubExpr();
+      return EmitUnion(CGM.EmitConstantExpr(SubExpr, SubExpr->getType(), CGF), 
+                       Ty);
+    }
+    // Explicit and implicit no-op casts
+    QualType Ty = E->getType(), SubTy = E->getSubExpr()->getType();
+    if (CGM.getContext().hasSameUnqualifiedType(Ty, SubTy)) {
+      return Visit(E->getSubExpr());
+    }
+    return 0;
+  }
+
+  llvm::Constant *VisitCXXDefaultArgExpr(CXXDefaultArgExpr *DAE) {
+    return Visit(DAE->getExpr());
+  }
+
+  llvm::Constant *EmitArrayInitialization(InitListExpr *ILE) {
+    std::vector<llvm::Constant*> Elts;
+    const llvm::ArrayType *AType =
+        cast<llvm::ArrayType>(ConvertType(ILE->getType()));
+    unsigned NumInitElements = ILE->getNumInits();
+    // FIXME: Check for wide strings
+    // FIXME: Check for NumInitElements exactly equal to 1??
+    if (NumInitElements > 0 && 
+        (isa<StringLiteral>(ILE->getInit(0)) ||
+         isa<ObjCEncodeExpr>(ILE->getInit(0))) &&
+        ILE->getType()->getArrayElementTypeNoTypeQual()->isCharType())
+      return Visit(ILE->getInit(0));
+    const llvm::Type *ElemTy = AType->getElementType();
+    unsigned NumElements = AType->getNumElements();
+
+    // Initialising an array requires us to automatically 
+    // initialise any elements that have not been initialised explicitly
+    unsigned NumInitableElts = std::min(NumInitElements, NumElements);
+
+    // Copy initializer elements.
+    unsigned i = 0;
+    bool RewriteType = false;
+    for (; i < NumInitableElts; ++i) {
+      Expr *Init = ILE->getInit(i);
+      llvm::Constant *C = CGM.EmitConstantExpr(Init, Init->getType(), CGF);
+      if (!C)
+        return 0;
+      RewriteType |= (C->getType() != ElemTy);
+      Elts.push_back(C);
+    }
+
+    // Initialize remaining array elements.
+    // FIXME: This doesn't handle member pointers correctly!
+    for (; i < NumElements; ++i)
+      Elts.push_back(llvm::Constant::getNullValue(ElemTy));
+
+    if (RewriteType) {
+      // FIXME: Try to avoid packing the array
+      std::vector<const llvm::Type*> Types;
+      for (unsigned i = 0; i < Elts.size(); ++i)
+        Types.push_back(Elts[i]->getType());
+      const llvm::StructType *SType = llvm::StructType::get(Types, true);
+      return llvm::ConstantStruct::get(SType, Elts);
+    }
+
+    return llvm::ConstantArray::get(AType, Elts);    
+  }
+
+  void InsertBitfieldIntoStruct(std::vector<llvm::Constant*>& Elts,
+                                FieldDecl* Field, Expr* E) {
+    // Calculate the value to insert
+    llvm::Constant *C = CGM.EmitConstantExpr(E, Field->getType(), CGF);
+    if (!C)
+      return;
+
+    llvm::ConstantInt *CI = dyn_cast<llvm::ConstantInt>(C);
+    if (!CI) {
+      CGM.ErrorUnsupported(E, "bitfield initialization");
+      return;
+    }
+    llvm::APInt V = CI->getValue();
+
+    // Calculate information about the relevant field
+    const llvm::Type* Ty = CI->getType();
+    const llvm::TargetData &TD = CGM.getTypes().getTargetData();
+    unsigned size = TD.getTypeAllocSizeInBits(Ty);
+    unsigned fieldOffset = CGM.getTypes().getLLVMFieldNo(Field) * size;
+    CodeGenTypes::BitFieldInfo bitFieldInfo =
+        CGM.getTypes().getBitFieldInfo(Field);
+    fieldOffset += bitFieldInfo.Begin;
+
+    // Find where to start the insertion
+    // FIXME: This is O(n^2) in the number of bit-fields!
+    // FIXME: This won't work if the struct isn't completely packed!
+    unsigned offset = 0, i = 0;
+    while (offset < (fieldOffset & -8))
+      offset += TD.getTypeAllocSizeInBits(Elts[i++]->getType());
+
+    // Advance over 0 sized elements (must terminate in bounds since
+    // the bitfield must have a size).
+    while (TD.getTypeAllocSizeInBits(Elts[i]->getType()) == 0)
+      ++i;
+
+    // Promote the size of V if necessary
+    // FIXME: This should never occur, but currently it can because initializer
+    // constants are cast to bool, and because clang is not enforcing bitfield
+    // width limits.
+    if (bitFieldInfo.Size > V.getBitWidth())
+      V.zext(bitFieldInfo.Size);
+
+    // Insert the bits into the struct
+    // FIXME: This algorthm is only correct on X86!
+    // FIXME: THis algorthm assumes bit-fields only have byte-size elements!
+    unsigned bitsToInsert = bitFieldInfo.Size;
+    unsigned curBits = std::min(8 - (fieldOffset & 7), bitsToInsert);
+    unsigned byte = V.getLoBits(curBits).getZExtValue() << (fieldOffset & 7);
+    do {
+      llvm::Constant* byteC = llvm::ConstantInt::get(llvm::Type::Int8Ty, byte);
+      Elts[i] = llvm::ConstantExpr::getOr(Elts[i], byteC);
+      ++i;
+      V = V.lshr(curBits);
+      bitsToInsert -= curBits;
+
+      if (!bitsToInsert)
+        break;
+
+      curBits = bitsToInsert > 8 ? 8 : bitsToInsert;
+      byte = V.getLoBits(curBits).getZExtValue();
+    } while (true);
+  }
+
+  llvm::Constant *EmitStructInitialization(InitListExpr *ILE) {
+    const llvm::StructType *SType =
+        cast<llvm::StructType>(ConvertType(ILE->getType()));
+    RecordDecl *RD = ILE->getType()->getAsRecordType()->getDecl();
+    std::vector<llvm::Constant*> Elts;
+
+    // Initialize the whole structure to zero.
+    // FIXME: This doesn't handle member pointers correctly!
+    for (unsigned i = 0; i < SType->getNumElements(); ++i) {
+      const llvm::Type *FieldTy = SType->getElementType(i);
+      Elts.push_back(llvm::Constant::getNullValue(FieldTy));
+    }
+
+    // Copy initializer elements. Skip padding fields.
+    unsigned EltNo = 0;  // Element no in ILE
+    int FieldNo = 0; // Field no in RecordDecl
+    bool RewriteType = false;
+    for (RecordDecl::field_iterator Field = RD->field_begin(CGM.getContext()),
+                                 FieldEnd = RD->field_end(CGM.getContext());
+         EltNo < ILE->getNumInits() && Field != FieldEnd; ++Field) {
+      FieldNo++;
+      if (!Field->getIdentifier())
+        continue;
+
+      if (Field->isBitField()) {
+        InsertBitfieldIntoStruct(Elts, *Field, ILE->getInit(EltNo));
+      } else {
+        unsigned FieldNo = CGM.getTypes().getLLVMFieldNo(*Field);
+        llvm::Constant *C = CGM.EmitConstantExpr(ILE->getInit(EltNo), 
+                                                 Field->getType(), CGF);
+        if (!C) return 0;
+        RewriteType |= (C->getType() != Elts[FieldNo]->getType());
+        Elts[FieldNo] = C;
+      }
+      EltNo++;
+    }
+
+    if (RewriteType) {
+      // FIXME: Make this work for non-packed structs
+      assert(SType->isPacked() && "Cannot recreate unpacked structs");
+      std::vector<const llvm::Type*> Types;
+      for (unsigned i = 0; i < Elts.size(); ++i)
+        Types.push_back(Elts[i]->getType());
+      SType = llvm::StructType::get(Types, true);
+    }
+
+    return llvm::ConstantStruct::get(SType, Elts);
+  }
+
+  llvm::Constant *EmitUnion(llvm::Constant *C, const llvm::Type *Ty) {
+    if (!C)
+      return 0;
+
+    // Build a struct with the union sub-element as the first member,
+    // and padded to the appropriate size
+    std::vector<llvm::Constant*> Elts;
+    std::vector<const llvm::Type*> Types;
+    Elts.push_back(C);
+    Types.push_back(C->getType());
+    unsigned CurSize = CGM.getTargetData().getTypeAllocSize(C->getType());
+    unsigned TotalSize = CGM.getTargetData().getTypeAllocSize(Ty);
+    while (CurSize < TotalSize) {
+      Elts.push_back(llvm::Constant::getNullValue(llvm::Type::Int8Ty));
+      Types.push_back(llvm::Type::Int8Ty);
+      CurSize++;
+    }
+
+    // This always generates a packed struct
+    // FIXME: Try to generate an unpacked struct when we can
+    llvm::StructType* STy = llvm::StructType::get(Types, true);
+    return llvm::ConstantStruct::get(STy, Elts);
+  }
+
+  llvm::Constant *EmitUnionInitialization(InitListExpr *ILE) {
+    const llvm::Type *Ty = ConvertType(ILE->getType());
+
+    FieldDecl* curField = ILE->getInitializedFieldInUnion();
+    if (!curField) {
+      // There's no field to initialize, so value-initialize the union.
+#ifndef NDEBUG
+      // Make sure that it's really an empty and not a failure of
+      // semantic analysis.
+      RecordDecl *RD = ILE->getType()->getAsRecordType()->getDecl();
+      for (RecordDecl::field_iterator Field = RD->field_begin(CGM.getContext()),
+                                   FieldEnd = RD->field_end(CGM.getContext());
+           Field != FieldEnd; ++Field)
+        assert(Field->isUnnamedBitfield() && "Only unnamed bitfields allowed");
+#endif
+      return llvm::Constant::getNullValue(Ty);
+    }
+
+    if (curField->isBitField()) {
+      // Create a dummy struct for bit-field insertion
+      unsigned NumElts = CGM.getTargetData().getTypeAllocSize(Ty);
+      llvm::Constant* NV = llvm::Constant::getNullValue(llvm::Type::Int8Ty);
+      std::vector<llvm::Constant*> Elts(NumElts, NV);
+
+      InsertBitfieldIntoStruct(Elts, curField, ILE->getInit(0));
+      const llvm::ArrayType *RetTy =
+          llvm::ArrayType::get(NV->getType(), NumElts);
+      return llvm::ConstantArray::get(RetTy, Elts);
+    }
+
+    llvm::Constant *InitElem;
+    if (ILE->getNumInits() > 0) {
+      Expr *Init = ILE->getInit(0);
+      InitElem = CGM.EmitConstantExpr(Init, Init->getType(), CGF);
+    } else {
+      InitElem = CGM.EmitNullConstant(curField->getType());
+    }
+    return EmitUnion(InitElem, Ty);
+  }
+
+  llvm::Constant *EmitVectorInitialization(InitListExpr *ILE) {
+    const llvm::VectorType *VType =
+        cast<llvm::VectorType>(ConvertType(ILE->getType()));
+    const llvm::Type *ElemTy = VType->getElementType();
+    std::vector<llvm::Constant*> Elts;
+    unsigned NumElements = VType->getNumElements();
+    unsigned NumInitElements = ILE->getNumInits();
+
+    unsigned NumInitableElts = std::min(NumInitElements, NumElements);
+
+    // Copy initializer elements.
+    unsigned i = 0;
+    for (; i < NumInitableElts; ++i) {
+      Expr *Init = ILE->getInit(i);
+      llvm::Constant *C = CGM.EmitConstantExpr(Init, Init->getType(), CGF);
+      if (!C)
+        return 0;
+      Elts.push_back(C);
+    }
+
+    for (; i < NumElements; ++i)
+      Elts.push_back(llvm::Constant::getNullValue(ElemTy));
+
+    return llvm::ConstantVector::get(VType, Elts);    
+  }
+  
+  llvm::Constant *VisitImplicitValueInitExpr(ImplicitValueInitExpr* E) {
+    return CGM.EmitNullConstant(E->getType());
+  }
+    
+  llvm::Constant *VisitInitListExpr(InitListExpr *ILE) {
+    if (ILE->getType()->isScalarType()) {
+      // We have a scalar in braces. Just use the first element.
+      if (ILE->getNumInits() > 0) {
+        Expr *Init = ILE->getInit(0);
+        return CGM.EmitConstantExpr(Init, Init->getType(), CGF);
+      }
+      return CGM.EmitNullConstant(ILE->getType());
+    }
+    
+    if (ILE->getType()->isArrayType())
+      return EmitArrayInitialization(ILE);
+
+    if (ILE->getType()->isStructureType())
+      return EmitStructInitialization(ILE);
+
+    if (ILE->getType()->isUnionType())
+      return EmitUnionInitialization(ILE);
+
+    if (ILE->getType()->isVectorType())
+      return EmitVectorInitialization(ILE);
+
+    assert(0 && "Unable to handle InitListExpr");
+    // Get rid of control reaches end of void function warning.
+    // Not reached.
+    return 0;
+  }
+
+  llvm::Constant *VisitStringLiteral(StringLiteral *E) {
+    assert(!E->getType()->isPointerType() && "Strings are always arrays");
+    
+    // This must be a string initializing an array in a static initializer.
+    // Don't emit it as the address of the string, emit the string data itself
+    // as an inline array.
+    return llvm::ConstantArray::get(CGM.GetStringForStringLiteral(E), false);
+  }
+
+  llvm::Constant *VisitObjCEncodeExpr(ObjCEncodeExpr *E) {
+    // This must be an @encode initializing an array in a static initializer.
+    // Don't emit it as the address of the string, emit the string data itself
+    // as an inline array.
+    std::string Str;
+    CGM.getContext().getObjCEncodingForType(E->getEncodedType(), Str);
+    const ConstantArrayType *CAT = cast<ConstantArrayType>(E->getType());
+    
+    // Resize the string to the right size, adding zeros at the end, or
+    // truncating as needed.
+    Str.resize(CAT->getSize().getZExtValue(), '\0');
+    return llvm::ConstantArray::get(Str, false);
+  }
+    
+  llvm::Constant *VisitUnaryExtension(const UnaryOperator *E) {
+    return Visit(E->getSubExpr());
+  }
+
+  // Utility methods
+  const llvm::Type *ConvertType(QualType T) {
+    return CGM.getTypes().ConvertType(T);
+  }
+
+public:
+  llvm::Constant *EmitLValue(Expr *E) {
+    switch (E->getStmtClass()) {
+    default: break;
+    case Expr::CompoundLiteralExprClass: {
+      // Note that due to the nature of compound literals, this is guaranteed
+      // to be the only use of the variable, so we just generate it here.
+      CompoundLiteralExpr *CLE = cast<CompoundLiteralExpr>(E);
+      llvm::Constant* C = Visit(CLE->getInitializer());
+      // FIXME: "Leaked" on failure.
+      if (C)
+        C = new llvm::GlobalVariable(C->getType(),
+                                     E->getType().isConstQualified(), 
+                                     llvm::GlobalValue::InternalLinkage,
+                                     C, ".compoundliteral", &CGM.getModule());
+      return C;
+    }
+    case Expr::DeclRefExprClass: 
+    case Expr::QualifiedDeclRefExprClass: {
+      NamedDecl *Decl = cast<DeclRefExpr>(E)->getDecl();
+      if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(Decl))
+        return CGM.GetAddrOfFunction(GlobalDecl(FD));
+      if (const VarDecl* VD = dyn_cast<VarDecl>(Decl)) {
+        // We can never refer to a variable with local storage.
+        if (!VD->hasLocalStorage()) {          
+          if (VD->isFileVarDecl() || VD->hasExternalStorage())
+            return CGM.GetAddrOfGlobalVar(VD);
+          else if (VD->isBlockVarDecl()) {
+            assert(CGF && "Can't access static local vars without CGF");
+            return CGF->GetAddrOfStaticLocalVar(VD);
+          }
+        }
+      }
+      break;
+    }
+    case Expr::StringLiteralClass:
+      return CGM.GetAddrOfConstantStringFromLiteral(cast<StringLiteral>(E));
+    case Expr::ObjCEncodeExprClass:
+      return CGM.GetAddrOfConstantStringFromObjCEncode(cast<ObjCEncodeExpr>(E));
+    case Expr::ObjCStringLiteralClass: {
+      ObjCStringLiteral* SL = cast<ObjCStringLiteral>(E);
+      llvm::Constant *C = CGM.getObjCRuntime().GenerateConstantString(SL);
+      return llvm::ConstantExpr::getBitCast(C, ConvertType(E->getType()));
+    }
+    case Expr::PredefinedExprClass: {
+      // __func__/__FUNCTION__ -> "".  __PRETTY_FUNCTION__ -> "top level".
+      std::string Str;
+      if (cast<PredefinedExpr>(E)->getIdentType() == 
+          PredefinedExpr::PrettyFunction)
+        Str = "top level";
+      
+      return CGM.GetAddrOfConstantCString(Str, ".tmp");
+    }
+    case Expr::AddrLabelExprClass: {
+      assert(CGF && "Invalid address of label expression outside function.");
+      unsigned id = CGF->GetIDForAddrOfLabel(cast<AddrLabelExpr>(E)->getLabel());
+      llvm::Constant *C = llvm::ConstantInt::get(llvm::Type::Int32Ty, id);
+      return llvm::ConstantExpr::getIntToPtr(C, ConvertType(E->getType()));
+    }
+    case Expr::CallExprClass: {
+      CallExpr* CE = cast<CallExpr>(E);
+      if (CE->isBuiltinCall(CGM.getContext()) != 
+            Builtin::BI__builtin___CFStringMakeConstantString)
+        break;
+      const Expr *Arg = CE->getArg(0)->IgnoreParenCasts();
+      const StringLiteral *Literal = cast<StringLiteral>(Arg);
+      // FIXME: need to deal with UCN conversion issues.
+      return CGM.GetAddrOfConstantCFString(Literal);
+    }
+    case Expr::BlockExprClass: {
+      std::string FunctionName;
+      if (CGF)
+        FunctionName = CGF->CurFn->getName();
+      else
+        FunctionName = "global";
+
+      return CGM.GetAddrOfGlobalBlock(cast<BlockExpr>(E), FunctionName.c_str());
+    }
+    }
+
+    return 0;
+  }
+};
+  
+}  // end anonymous namespace.
+
+llvm::Constant *CodeGenModule::EmitConstantExpr(const Expr *E,
+                                                QualType DestType,
+                                                CodeGenFunction *CGF) {
+  Expr::EvalResult Result;
+  
+  bool Success = false;
+  
+  if (DestType->isReferenceType())
+    Success = E->EvaluateAsLValue(Result, Context);
+  else 
+    Success = E->Evaluate(Result, Context);
+  
+  if (Success) {
+    assert(!Result.HasSideEffects && 
+           "Constant expr should not have any side effects!");
+    switch (Result.Val.getKind()) {
+    case APValue::Uninitialized:
+      assert(0 && "Constant expressions should be initialized.");
+      return 0;
+    case APValue::LValue: {
+      const llvm::Type *DestTy = getTypes().ConvertTypeForMem(DestType);
+      llvm::Constant *Offset = 
+        llvm::ConstantInt::get(llvm::Type::Int64Ty, 
+                               Result.Val.getLValueOffset());
+      
+      llvm::Constant *C;
+      if (const Expr *LVBase = Result.Val.getLValueBase()) {
+        C = ConstExprEmitter(*this, CGF).EmitLValue(const_cast<Expr*>(LVBase));
+
+        // Apply offset if necessary.
+        if (!Offset->isNullValue()) {
+          const llvm::Type *Type = 
+            llvm::PointerType::getUnqual(llvm::Type::Int8Ty);
+          llvm::Constant *Casted = llvm::ConstantExpr::getBitCast(C, Type);
+          Casted = llvm::ConstantExpr::getGetElementPtr(Casted, &Offset, 1);
+          C = llvm::ConstantExpr::getBitCast(Casted, C->getType());
+        }
+
+        // Convert to the appropriate type; this could be an lvalue for
+        // an integer.
+        if (isa<llvm::PointerType>(DestTy))
+          return llvm::ConstantExpr::getBitCast(C, DestTy);
+
+        return llvm::ConstantExpr::getPtrToInt(C, DestTy);
+      } else {
+        C = Offset;
+
+        // Convert to the appropriate type; this could be an lvalue for
+        // an integer.
+        if (isa<llvm::PointerType>(DestTy))
+          return llvm::ConstantExpr::getIntToPtr(C, DestTy);
+
+        // If the types don't match this should only be a truncate.
+        if (C->getType() != DestTy)
+          return llvm::ConstantExpr::getTrunc(C, DestTy);
+
+        return C;
+      }
+    }
+    case APValue::Int: {
+      llvm::Constant *C = llvm::ConstantInt::get(Result.Val.getInt());
+      
+      if (C->getType() == llvm::Type::Int1Ty) {
+        const llvm::Type *BoolTy = getTypes().ConvertTypeForMem(E->getType());
+        C = llvm::ConstantExpr::getZExt(C, BoolTy);
+      }
+      return C;
+    }
+    case APValue::ComplexInt: {
+      llvm::Constant *Complex[2];
+      
+      Complex[0] = llvm::ConstantInt::get(Result.Val.getComplexIntReal());
+      Complex[1] = llvm::ConstantInt::get(Result.Val.getComplexIntImag());
+      
+      return llvm::ConstantStruct::get(Complex, 2);
+    }
+    case APValue::Float:
+      return llvm::ConstantFP::get(Result.Val.getFloat());
+    case APValue::ComplexFloat: {
+      llvm::Constant *Complex[2];
+      
+      Complex[0] = llvm::ConstantFP::get(Result.Val.getComplexFloatReal());
+      Complex[1] = llvm::ConstantFP::get(Result.Val.getComplexFloatImag());
+      
+      return llvm::ConstantStruct::get(Complex, 2);
+    }
+    case APValue::Vector: {
+      llvm::SmallVector<llvm::Constant *, 4> Inits;
+      unsigned NumElts = Result.Val.getVectorLength();
+      
+      for (unsigned i = 0; i != NumElts; ++i) {
+        APValue &Elt = Result.Val.getVectorElt(i);
+        if (Elt.isInt())
+          Inits.push_back(llvm::ConstantInt::get(Elt.getInt()));
+        else
+          Inits.push_back(llvm::ConstantFP::get(Elt.getFloat()));
+      }
+      return llvm::ConstantVector::get(&Inits[0], Inits.size());
+    }
+    }
+  }
+
+  llvm::Constant* C = ConstExprEmitter(*this, CGF).Visit(const_cast<Expr*>(E));
+  if (C && C->getType() == llvm::Type::Int1Ty) {
+    const llvm::Type *BoolTy = getTypes().ConvertTypeForMem(E->getType());
+    C = llvm::ConstantExpr::getZExt(C, BoolTy);
+  }
+  return C;
+}
+
+llvm::Constant *CodeGenModule::EmitNullConstant(QualType T) {
+  // Always return an LLVM null constant for now; this will change when we
+  // get support for IRGen of member pointers.
+  return llvm::Constant::getNullValue(getTypes().ConvertType(T));
+}