Anders Carlsson | 5b95592 | 2009-11-24 05:51:11 +0000 | [diff] [blame] | 1 | //===--- CGExprCXX.cpp - Emit LLVM Code for C++ expressions ---------------===// |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 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 contains code dealing with code generation of C++ expressions |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "CodeGenFunction.h" |
John McCall | 4c40d98 | 2010-08-31 07:33:07 +0000 | [diff] [blame] | 15 | #include "CGCXXABI.h" |
Fariborz Jahanian | 842ddd0 | 2010-05-20 21:38:57 +0000 | [diff] [blame] | 16 | #include "CGObjCRuntime.h" |
Chris Lattner | 6c552c1 | 2010-07-20 20:19:24 +0000 | [diff] [blame] | 17 | #include "llvm/Intrinsics.h" |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 18 | using namespace clang; |
| 19 | using namespace CodeGen; |
| 20 | |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 21 | RValue CodeGenFunction::EmitCXXMemberCall(const CXXMethodDecl *MD, |
| 22 | llvm::Value *Callee, |
| 23 | ReturnValueSlot ReturnValue, |
| 24 | llvm::Value *This, |
Anders Carlsson | c997d42 | 2010-01-02 01:01:18 +0000 | [diff] [blame] | 25 | llvm::Value *VTT, |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 26 | CallExpr::const_arg_iterator ArgBeg, |
| 27 | CallExpr::const_arg_iterator ArgEnd) { |
| 28 | assert(MD->isInstance() && |
| 29 | "Trying to emit a member call expr on a static method!"); |
| 30 | |
| 31 | const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>(); |
| 32 | |
| 33 | CallArgList Args; |
| 34 | |
| 35 | // Push the this ptr. |
| 36 | Args.push_back(std::make_pair(RValue::get(This), |
| 37 | MD->getThisType(getContext()))); |
| 38 | |
Anders Carlsson | c997d42 | 2010-01-02 01:01:18 +0000 | [diff] [blame] | 39 | // If there is a VTT parameter, emit it. |
| 40 | if (VTT) { |
| 41 | QualType T = getContext().getPointerType(getContext().VoidPtrTy); |
| 42 | Args.push_back(std::make_pair(RValue::get(VTT), T)); |
| 43 | } |
| 44 | |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 45 | // And the rest of the call args |
| 46 | EmitCallArgs(Args, FPT, ArgBeg, ArgEnd); |
| 47 | |
John McCall | 04a67a6 | 2010-02-05 21:31:56 +0000 | [diff] [blame] | 48 | QualType ResultType = FPT->getResultType(); |
| 49 | return EmitCall(CGM.getTypes().getFunctionInfo(ResultType, Args, |
Rafael Espindola | 264ba48 | 2010-03-30 20:24:48 +0000 | [diff] [blame] | 50 | FPT->getExtInfo()), |
| 51 | Callee, ReturnValue, Args, MD); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 52 | } |
| 53 | |
| 54 | /// canDevirtualizeMemberFunctionCalls - Checks whether virtual calls on given |
| 55 | /// expr can be devirtualized. |
| 56 | static bool canDevirtualizeMemberFunctionCalls(const Expr *Base) { |
| 57 | if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Base)) { |
| 58 | if (const VarDecl *VD = dyn_cast<VarDecl>(DRE->getDecl())) { |
| 59 | // This is a record decl. We know the type and can devirtualize it. |
| 60 | return VD->getType()->isRecordType(); |
| 61 | } |
| 62 | |
| 63 | return false; |
| 64 | } |
| 65 | |
| 66 | // We can always devirtualize calls on temporary object expressions. |
Eli Friedman | 6997aae | 2010-01-31 20:58:15 +0000 | [diff] [blame] | 67 | if (isa<CXXConstructExpr>(Base)) |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 68 | return true; |
| 69 | |
| 70 | // And calls on bound temporaries. |
| 71 | if (isa<CXXBindTemporaryExpr>(Base)) |
| 72 | return true; |
| 73 | |
| 74 | // Check if this is a call expr that returns a record type. |
| 75 | if (const CallExpr *CE = dyn_cast<CallExpr>(Base)) |
| 76 | return CE->getCallReturnType()->isRecordType(); |
| 77 | |
| 78 | // We can't devirtualize the call. |
| 79 | return false; |
| 80 | } |
| 81 | |
| 82 | RValue CodeGenFunction::EmitCXXMemberCallExpr(const CXXMemberCallExpr *CE, |
| 83 | ReturnValueSlot ReturnValue) { |
| 84 | if (isa<BinaryOperator>(CE->getCallee()->IgnoreParens())) |
| 85 | return EmitCXXMemberPointerCallExpr(CE, ReturnValue); |
| 86 | |
| 87 | const MemberExpr *ME = cast<MemberExpr>(CE->getCallee()->IgnoreParens()); |
| 88 | const CXXMethodDecl *MD = cast<CXXMethodDecl>(ME->getMemberDecl()); |
| 89 | |
| 90 | if (MD->isStatic()) { |
| 91 | // The method is static, emit it as we would a regular call. |
| 92 | llvm::Value *Callee = CGM.GetAddrOfFunction(MD); |
| 93 | return EmitCall(getContext().getPointerType(MD->getType()), Callee, |
| 94 | ReturnValue, CE->arg_begin(), CE->arg_end()); |
| 95 | } |
| 96 | |
| 97 | const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>(); |
| 98 | |
| 99 | const llvm::Type *Ty = |
| 100 | CGM.getTypes().GetFunctionType(CGM.getTypes().getFunctionInfo(MD), |
| 101 | FPT->isVariadic()); |
| 102 | llvm::Value *This; |
| 103 | |
| 104 | if (ME->isArrow()) |
| 105 | This = EmitScalarExpr(ME->getBase()); |
| 106 | else { |
| 107 | LValue BaseLV = EmitLValue(ME->getBase()); |
| 108 | This = BaseLV.getAddress(); |
| 109 | } |
| 110 | |
| 111 | if (MD->isCopyAssignment() && MD->isTrivial()) { |
| 112 | // We don't like to generate the trivial copy assignment operator when |
| 113 | // it isn't necessary; just produce the proper effect here. |
| 114 | llvm::Value *RHS = EmitLValue(*CE->arg_begin()).getAddress(); |
| 115 | EmitAggregateCopy(This, RHS, CE->getType()); |
| 116 | return RValue::get(This); |
| 117 | } |
| 118 | |
| 119 | // C++ [class.virtual]p12: |
| 120 | // Explicit qualification with the scope operator (5.1) suppresses the |
| 121 | // virtual call mechanism. |
| 122 | // |
| 123 | // We also don't emit a virtual call if the base expression has a record type |
| 124 | // because then we know what the type is. |
| 125 | llvm::Value *Callee; |
| 126 | if (const CXXDestructorDecl *Destructor |
| 127 | = dyn_cast<CXXDestructorDecl>(MD)) { |
| 128 | if (Destructor->isTrivial()) |
| 129 | return RValue::get(0); |
| 130 | if (MD->isVirtual() && !ME->hasQualifier() && |
| 131 | !canDevirtualizeMemberFunctionCalls(ME->getBase())) { |
| 132 | Callee = BuildVirtualCall(Destructor, Dtor_Complete, This, Ty); |
| 133 | } else { |
| 134 | Callee = CGM.GetAddrOfFunction(GlobalDecl(Destructor, Dtor_Complete), Ty); |
| 135 | } |
| 136 | } else if (MD->isVirtual() && !ME->hasQualifier() && |
| 137 | !canDevirtualizeMemberFunctionCalls(ME->getBase())) { |
| 138 | Callee = BuildVirtualCall(MD, This, Ty); |
| 139 | } else { |
| 140 | Callee = CGM.GetAddrOfFunction(MD, Ty); |
| 141 | } |
| 142 | |
Anders Carlsson | c997d42 | 2010-01-02 01:01:18 +0000 | [diff] [blame] | 143 | return EmitCXXMemberCall(MD, Callee, ReturnValue, This, /*VTT=*/0, |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 144 | CE->arg_begin(), CE->arg_end()); |
| 145 | } |
| 146 | |
| 147 | RValue |
| 148 | CodeGenFunction::EmitCXXMemberPointerCallExpr(const CXXMemberCallExpr *E, |
| 149 | ReturnValueSlot ReturnValue) { |
| 150 | const BinaryOperator *BO = |
| 151 | cast<BinaryOperator>(E->getCallee()->IgnoreParens()); |
| 152 | const Expr *BaseExpr = BO->getLHS(); |
| 153 | const Expr *MemFnExpr = BO->getRHS(); |
| 154 | |
| 155 | const MemberPointerType *MPT = |
| 156 | MemFnExpr->getType()->getAs<MemberPointerType>(); |
John McCall | 93d557b | 2010-08-22 00:05:51 +0000 | [diff] [blame] | 157 | |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 158 | const FunctionProtoType *FPT = |
| 159 | MPT->getPointeeType()->getAs<FunctionProtoType>(); |
| 160 | const CXXRecordDecl *RD = |
| 161 | cast<CXXRecordDecl>(MPT->getClass()->getAs<RecordType>()->getDecl()); |
| 162 | |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 163 | // Get the member function pointer. |
John McCall | d608cdb | 2010-08-22 10:59:02 +0000 | [diff] [blame] | 164 | llvm::Value *MemFnPtr = EmitScalarExpr(MemFnExpr); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 165 | |
| 166 | // Emit the 'this' pointer. |
| 167 | llvm::Value *This; |
| 168 | |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 169 | if (BO->getOpcode() == BO_PtrMemI) |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 170 | This = EmitScalarExpr(BaseExpr); |
| 171 | else |
| 172 | This = EmitLValue(BaseExpr).getAddress(); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 173 | |
John McCall | 93d557b | 2010-08-22 00:05:51 +0000 | [diff] [blame] | 174 | // Ask the ABI to load the callee. Note that This is modified. |
| 175 | llvm::Value *Callee = |
| 176 | CGM.getCXXABI().EmitLoadOfMemberFunctionPointer(CGF, This, MemFnPtr, MPT); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 177 | |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 178 | CallArgList Args; |
| 179 | |
| 180 | QualType ThisType = |
| 181 | getContext().getPointerType(getContext().getTagDeclType(RD)); |
| 182 | |
| 183 | // Push the this ptr. |
| 184 | Args.push_back(std::make_pair(RValue::get(This), ThisType)); |
| 185 | |
| 186 | // And the rest of the call args |
| 187 | EmitCallArgs(Args, FPT, E->arg_begin(), E->arg_end()); |
John McCall | 04a67a6 | 2010-02-05 21:31:56 +0000 | [diff] [blame] | 188 | const FunctionType *BO_FPT = BO->getType()->getAs<FunctionProtoType>(); |
| 189 | return EmitCall(CGM.getTypes().getFunctionInfo(Args, BO_FPT), Callee, |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 190 | ReturnValue, Args); |
| 191 | } |
| 192 | |
| 193 | RValue |
| 194 | CodeGenFunction::EmitCXXOperatorMemberCallExpr(const CXXOperatorCallExpr *E, |
| 195 | const CXXMethodDecl *MD, |
| 196 | ReturnValueSlot ReturnValue) { |
| 197 | assert(MD->isInstance() && |
| 198 | "Trying to emit a member call expr on a static method!"); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 199 | if (MD->isCopyAssignment()) { |
| 200 | const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(MD->getDeclContext()); |
| 201 | if (ClassDecl->hasTrivialCopyAssignment()) { |
| 202 | assert(!ClassDecl->hasUserDeclaredCopyAssignment() && |
| 203 | "EmitCXXOperatorMemberCallExpr - user declared copy assignment"); |
Fariborz Jahanian | b3ebe94 | 2010-05-10 22:57:35 +0000 | [diff] [blame] | 204 | LValue LV = EmitLValue(E->getArg(0)); |
| 205 | llvm::Value *This; |
Fariborz Jahanian | 98c9d1f | 2010-09-01 19:36:41 +0000 | [diff] [blame] | 206 | if (LV.isPropertyRef() || LV.isKVCRef()) { |
Fariborz Jahanian | c9a8fa4 | 2010-05-16 00:10:46 +0000 | [diff] [blame] | 207 | llvm::Value *AggLoc = CreateMemTemp(E->getArg(1)->getType()); |
Fariborz Jahanian | 0ca0b1f | 2010-05-15 23:05:52 +0000 | [diff] [blame] | 208 | EmitAggExpr(E->getArg(1), AggLoc, false /*VolatileDest*/); |
Fariborz Jahanian | 98c9d1f | 2010-09-01 19:36:41 +0000 | [diff] [blame] | 209 | if (LV.isPropertyRef()) |
| 210 | EmitObjCPropertySet(LV.getPropertyRefExpr(), |
| 211 | RValue::getAggregate(AggLoc, |
| 212 | false /*VolatileDest*/)); |
| 213 | else |
| 214 | EmitObjCPropertySet(LV.getKVCRefExpr(), |
| 215 | RValue::getAggregate(AggLoc, |
| 216 | false /*VolatileDest*/)); |
Fariborz Jahanian | 0ca0b1f | 2010-05-15 23:05:52 +0000 | [diff] [blame] | 217 | return RValue::getAggregate(0, false); |
Fariborz Jahanian | b3ebe94 | 2010-05-10 22:57:35 +0000 | [diff] [blame] | 218 | } |
| 219 | else |
| 220 | This = LV.getAddress(); |
| 221 | |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 222 | llvm::Value *Src = EmitLValue(E->getArg(1)).getAddress(); |
| 223 | QualType Ty = E->getType(); |
Fariborz Jahanian | 55bcace | 2010-06-15 22:44:06 +0000 | [diff] [blame] | 224 | EmitAggregateCopy(This, Src, Ty); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 225 | return RValue::get(This); |
| 226 | } |
| 227 | } |
| 228 | |
| 229 | const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>(); |
| 230 | const llvm::Type *Ty = |
| 231 | CGM.getTypes().GetFunctionType(CGM.getTypes().getFunctionInfo(MD), |
| 232 | FPT->isVariadic()); |
Fariborz Jahanian | bbb5224 | 2010-05-07 18:56:13 +0000 | [diff] [blame] | 233 | LValue LV = EmitLValue(E->getArg(0)); |
| 234 | llvm::Value *This; |
Fariborz Jahanian | 98c9d1f | 2010-09-01 19:36:41 +0000 | [diff] [blame] | 235 | if (LV.isPropertyRef() || LV.isKVCRef()) { |
| 236 | QualType QT = E->getArg(0)->getType(); |
| 237 | RValue RV = |
| 238 | LV.isPropertyRef() ? EmitLoadOfPropertyRefLValue(LV, QT) |
| 239 | : EmitLoadOfKVCRefLValue(LV, QT); |
Fariborz Jahanian | 1d49f21 | 2010-05-20 16:46:55 +0000 | [diff] [blame] | 240 | assert (!RV.isScalar() && "EmitCXXOperatorMemberCallExpr"); |
| 241 | This = RV.getAggregateAddr(); |
Fariborz Jahanian | bbb5224 | 2010-05-07 18:56:13 +0000 | [diff] [blame] | 242 | } |
| 243 | else |
| 244 | This = LV.getAddress(); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 245 | |
| 246 | llvm::Value *Callee; |
| 247 | if (MD->isVirtual() && !canDevirtualizeMemberFunctionCalls(E->getArg(0))) |
| 248 | Callee = BuildVirtualCall(MD, This, Ty); |
| 249 | else |
| 250 | Callee = CGM.GetAddrOfFunction(MD, Ty); |
| 251 | |
Anders Carlsson | c997d42 | 2010-01-02 01:01:18 +0000 | [diff] [blame] | 252 | return EmitCXXMemberCall(MD, Callee, ReturnValue, This, /*VTT=*/0, |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 253 | E->arg_begin() + 1, E->arg_end()); |
| 254 | } |
| 255 | |
| 256 | void |
| 257 | CodeGenFunction::EmitCXXConstructExpr(llvm::Value *Dest, |
| 258 | const CXXConstructExpr *E) { |
| 259 | assert(Dest && "Must have a destination!"); |
| 260 | const CXXConstructorDecl *CD = E->getConstructor(); |
Douglas Gregor | 759e41b | 2010-08-22 16:15:35 +0000 | [diff] [blame] | 261 | |
| 262 | // If we require zero initialization before (or instead of) calling the |
| 263 | // constructor, as can be the case with a non-user-provided default |
| 264 | // constructor, emit the zero initialization now. |
| 265 | if (E->requiresZeroInitialization()) |
| 266 | EmitNullInitialization(Dest, E->getType()); |
| 267 | |
| 268 | |
| 269 | // If this is a call to a trivial default constructor, do nothing. |
| 270 | if (CD->isTrivial() && CD->isDefaultConstructor()) |
| 271 | return; |
| 272 | |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 273 | // Code gen optimization to eliminate copy constructor and return |
Douglas Gregor | 3c9034c | 2010-05-15 00:13:29 +0000 | [diff] [blame] | 274 | // its first argument instead, if in fact that argument is a temporary |
| 275 | // object. |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 276 | if (getContext().getLangOptions().ElideConstructors && E->isElidable()) { |
Douglas Gregor | 3c9034c | 2010-05-15 00:13:29 +0000 | [diff] [blame] | 277 | if (const Expr *Arg = E->getArg(0)->getTemporaryObject()) { |
| 278 | EmitAggExpr(Arg, Dest, false); |
| 279 | return; |
| 280 | } |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 281 | } |
Douglas Gregor | 759e41b | 2010-08-22 16:15:35 +0000 | [diff] [blame] | 282 | |
| 283 | const ConstantArrayType *Array |
| 284 | = getContext().getAsConstantArrayType(E->getType()); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 285 | if (Array) { |
| 286 | QualType BaseElementTy = getContext().getBaseElementType(Array); |
| 287 | const llvm::Type *BasePtr = ConvertType(BaseElementTy); |
| 288 | BasePtr = llvm::PointerType::getUnqual(BasePtr); |
| 289 | llvm::Value *BaseAddrPtr = |
Anders Carlsson | 43db20e | 2010-05-01 17:02:18 +0000 | [diff] [blame] | 290 | Builder.CreateBitCast(Dest, BasePtr); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 291 | |
| 292 | EmitCXXAggrConstructorCall(CD, Array, BaseAddrPtr, |
| 293 | E->arg_begin(), E->arg_end()); |
| 294 | } |
Anders Carlsson | 155ed4a | 2010-05-02 23:20:53 +0000 | [diff] [blame] | 295 | else { |
| 296 | CXXCtorType Type = |
| 297 | (E->getConstructionKind() == CXXConstructExpr::CK_Complete) |
| 298 | ? Ctor_Complete : Ctor_Base; |
| 299 | bool ForVirtualBase = |
| 300 | E->getConstructionKind() == CXXConstructExpr::CK_VirtualBase; |
| 301 | |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 302 | // Call the constructor. |
Anders Carlsson | 155ed4a | 2010-05-02 23:20:53 +0000 | [diff] [blame] | 303 | EmitCXXConstructorCall(CD, Type, ForVirtualBase, Dest, |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 304 | E->arg_begin(), E->arg_end()); |
Anders Carlsson | 155ed4a | 2010-05-02 23:20:53 +0000 | [diff] [blame] | 305 | } |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 306 | } |
| 307 | |
John McCall | 5172ed9 | 2010-08-23 01:17:59 +0000 | [diff] [blame] | 308 | /// Check whether the given operator new[] is the global placement |
| 309 | /// operator new[]. |
| 310 | static bool IsPlacementOperatorNewArray(ASTContext &Ctx, |
| 311 | const FunctionDecl *Fn) { |
| 312 | // Must be in global scope. Note that allocation functions can't be |
| 313 | // declared in namespaces. |
Sebastian Redl | 7a126a4 | 2010-08-31 00:36:30 +0000 | [diff] [blame] | 314 | if (!Fn->getDeclContext()->getRedeclContext()->isFileContext()) |
John McCall | 5172ed9 | 2010-08-23 01:17:59 +0000 | [diff] [blame] | 315 | return false; |
| 316 | |
| 317 | // Signature must be void *operator new[](size_t, void*). |
| 318 | // The size_t is common to all operator new[]s. |
| 319 | if (Fn->getNumParams() != 2) |
| 320 | return false; |
| 321 | |
| 322 | CanQualType ParamType = Ctx.getCanonicalType(Fn->getParamDecl(1)->getType()); |
| 323 | return (ParamType == Ctx.VoidPtrTy); |
| 324 | } |
| 325 | |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 326 | static CharUnits CalculateCookiePadding(CodeGenFunction &CGF, |
| 327 | const CXXNewExpr *E) { |
Anders Carlsson | 871d078 | 2009-12-13 20:04:38 +0000 | [diff] [blame] | 328 | if (!E->isArray()) |
Ken Dyck | caf647c | 2010-01-26 19:44:24 +0000 | [diff] [blame] | 329 | return CharUnits::Zero(); |
Anders Carlsson | 871d078 | 2009-12-13 20:04:38 +0000 | [diff] [blame] | 330 | |
Anders Carlsson | dd93755 | 2009-12-13 20:34:34 +0000 | [diff] [blame] | 331 | // No cookie is required if the new operator being used is |
| 332 | // ::operator new[](size_t, void*). |
| 333 | const FunctionDecl *OperatorNew = E->getOperatorNew(); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 334 | if (IsPlacementOperatorNewArray(CGF.getContext(), OperatorNew)) |
John McCall | 5172ed9 | 2010-08-23 01:17:59 +0000 | [diff] [blame] | 335 | return CharUnits::Zero(); |
| 336 | |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 337 | return CGF.CGM.getCXXABI().GetArrayCookieSize(E->getAllocatedType()); |
Anders Carlsson | a4d4c01 | 2009-09-23 16:07:23 +0000 | [diff] [blame] | 338 | } |
| 339 | |
Fariborz Jahanian | ceb43b6 | 2010-03-24 16:57:01 +0000 | [diff] [blame] | 340 | static llvm::Value *EmitCXXNewAllocSize(ASTContext &Context, |
Chris Lattner | defe8b2 | 2010-07-20 18:45:57 +0000 | [diff] [blame] | 341 | CodeGenFunction &CGF, |
Anders Carlsson | a4d4c01 | 2009-09-23 16:07:23 +0000 | [diff] [blame] | 342 | const CXXNewExpr *E, |
Douglas Gregor | 59174c0 | 2010-07-21 01:10:17 +0000 | [diff] [blame] | 343 | llvm::Value *&NumElements, |
| 344 | llvm::Value *&SizeWithoutCookie) { |
Argyrios Kyrtzidis | e7ab92e | 2010-08-26 15:23:38 +0000 | [diff] [blame] | 345 | QualType ElemType = E->getAllocatedType(); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 346 | |
| 347 | const llvm::IntegerType *SizeTy = |
| 348 | cast<llvm::IntegerType>(CGF.ConvertType(CGF.getContext().getSizeType())); |
Anders Carlsson | a4d4c01 | 2009-09-23 16:07:23 +0000 | [diff] [blame] | 349 | |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 350 | CharUnits TypeSize = CGF.getContext().getTypeSizeInChars(ElemType); |
| 351 | |
Douglas Gregor | 59174c0 | 2010-07-21 01:10:17 +0000 | [diff] [blame] | 352 | if (!E->isArray()) { |
| 353 | SizeWithoutCookie = llvm::ConstantInt::get(SizeTy, TypeSize.getQuantity()); |
| 354 | return SizeWithoutCookie; |
| 355 | } |
Anders Carlsson | a4d4c01 | 2009-09-23 16:07:23 +0000 | [diff] [blame] | 356 | |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 357 | // Figure out the cookie size. |
| 358 | CharUnits CookieSize = CalculateCookiePadding(CGF, E); |
| 359 | |
Anders Carlsson | a4d4c01 | 2009-09-23 16:07:23 +0000 | [diff] [blame] | 360 | // Emit the array size expression. |
Argyrios Kyrtzidis | e7ab92e | 2010-08-26 15:23:38 +0000 | [diff] [blame] | 361 | // We multiply the size of all dimensions for NumElements. |
| 362 | // e.g for 'int[2][3]', ElemType is 'int' and NumElements is 6. |
Anders Carlsson | a4d4c01 | 2009-09-23 16:07:23 +0000 | [diff] [blame] | 363 | NumElements = CGF.EmitScalarExpr(E->getArraySize()); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 364 | assert(NumElements->getType() == SizeTy && "element count not a size_t"); |
| 365 | |
| 366 | uint64_t ArraySizeMultiplier = 1; |
Argyrios Kyrtzidis | e7ab92e | 2010-08-26 15:23:38 +0000 | [diff] [blame] | 367 | while (const ConstantArrayType *CAT |
| 368 | = CGF.getContext().getAsConstantArrayType(ElemType)) { |
| 369 | ElemType = CAT->getElementType(); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 370 | ArraySizeMultiplier *= CAT->getSize().getZExtValue(); |
Argyrios Kyrtzidis | e7ab92e | 2010-08-26 15:23:38 +0000 | [diff] [blame] | 371 | } |
| 372 | |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 373 | llvm::Value *Size; |
Chris Lattner | 83252dc | 2010-07-20 21:07:09 +0000 | [diff] [blame] | 374 | |
Chris Lattner | 806941e | 2010-07-20 21:55:52 +0000 | [diff] [blame] | 375 | // If someone is doing 'new int[42]' there is no need to do a dynamic check. |
| 376 | // Don't bloat the -O0 code. |
| 377 | if (llvm::ConstantInt *NumElementsC = |
| 378 | dyn_cast<llvm::ConstantInt>(NumElements)) { |
Chris Lattner | 806941e | 2010-07-20 21:55:52 +0000 | [diff] [blame] | 379 | llvm::APInt NEC = NumElementsC->getValue(); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 380 | unsigned SizeWidth = NEC.getBitWidth(); |
| 381 | |
| 382 | // Determine if there is an overflow here by doing an extended multiply. |
| 383 | NEC.zext(SizeWidth*2); |
| 384 | llvm::APInt SC(SizeWidth*2, TypeSize.getQuantity()); |
Chris Lattner | 806941e | 2010-07-20 21:55:52 +0000 | [diff] [blame] | 385 | SC *= NEC; |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 386 | |
| 387 | if (!CookieSize.isZero()) { |
| 388 | // Save the current size without a cookie. We don't care if an |
| 389 | // overflow's already happened because SizeWithoutCookie isn't |
| 390 | // used if the allocator returns null or throws, as it should |
| 391 | // always do on an overflow. |
| 392 | llvm::APInt SWC = SC; |
| 393 | SWC.trunc(SizeWidth); |
| 394 | SizeWithoutCookie = llvm::ConstantInt::get(SizeTy, SWC); |
| 395 | |
| 396 | // Add the cookie size. |
| 397 | SC += llvm::APInt(SizeWidth*2, CookieSize.getQuantity()); |
Chris Lattner | 806941e | 2010-07-20 21:55:52 +0000 | [diff] [blame] | 398 | } |
| 399 | |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 400 | if (SC.countLeadingZeros() >= SizeWidth) { |
| 401 | SC.trunc(SizeWidth); |
| 402 | Size = llvm::ConstantInt::get(SizeTy, SC); |
| 403 | } else { |
| 404 | // On overflow, produce a -1 so operator new throws. |
| 405 | Size = llvm::Constant::getAllOnesValue(SizeTy); |
| 406 | } |
Anders Carlsson | a4d4c01 | 2009-09-23 16:07:23 +0000 | [diff] [blame] | 407 | |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 408 | // Scale NumElements while we're at it. |
| 409 | uint64_t N = NEC.getZExtValue() * ArraySizeMultiplier; |
| 410 | NumElements = llvm::ConstantInt::get(SizeTy, N); |
| 411 | |
| 412 | // Otherwise, we don't need to do an overflow-checked multiplication if |
| 413 | // we're multiplying by one. |
| 414 | } else if (TypeSize.isOne()) { |
| 415 | assert(ArraySizeMultiplier == 1); |
| 416 | |
| 417 | Size = NumElements; |
| 418 | |
| 419 | // If we need a cookie, add its size in with an overflow check. |
| 420 | // This is maybe a little paranoid. |
| 421 | if (!CookieSize.isZero()) { |
| 422 | SizeWithoutCookie = Size; |
| 423 | |
| 424 | llvm::Value *CookieSizeV |
| 425 | = llvm::ConstantInt::get(SizeTy, CookieSize.getQuantity()); |
| 426 | |
| 427 | const llvm::Type *Types[] = { SizeTy }; |
| 428 | llvm::Value *UAddF |
| 429 | = CGF.CGM.getIntrinsic(llvm::Intrinsic::uadd_with_overflow, Types, 1); |
| 430 | llvm::Value *AddRes |
| 431 | = CGF.Builder.CreateCall2(UAddF, Size, CookieSizeV); |
| 432 | |
| 433 | Size = CGF.Builder.CreateExtractValue(AddRes, 0); |
| 434 | llvm::Value *DidOverflow = CGF.Builder.CreateExtractValue(AddRes, 1); |
| 435 | Size = CGF.Builder.CreateSelect(DidOverflow, |
| 436 | llvm::ConstantInt::get(SizeTy, -1), |
| 437 | Size); |
| 438 | } |
| 439 | |
| 440 | // Otherwise use the int.umul.with.overflow intrinsic. |
| 441 | } else { |
| 442 | llvm::Value *OutermostElementSize |
| 443 | = llvm::ConstantInt::get(SizeTy, TypeSize.getQuantity()); |
| 444 | |
| 445 | llvm::Value *NumOutermostElements = NumElements; |
| 446 | |
| 447 | // Scale NumElements by the array size multiplier. This might |
| 448 | // overflow, but only if the multiplication below also overflows, |
| 449 | // in which case this multiplication isn't used. |
| 450 | if (ArraySizeMultiplier != 1) |
| 451 | NumElements = CGF.Builder.CreateMul(NumElements, |
| 452 | llvm::ConstantInt::get(SizeTy, ArraySizeMultiplier)); |
| 453 | |
| 454 | // The requested size of the outermost array is non-constant. |
| 455 | // Multiply that by the static size of the elements of that array; |
| 456 | // on unsigned overflow, set the size to -1 to trigger an |
| 457 | // exception from the allocation routine. This is sufficient to |
| 458 | // prevent buffer overruns from the allocator returning a |
| 459 | // seemingly valid pointer to insufficient space. This idea comes |
| 460 | // originally from MSVC, and GCC has an open bug requesting |
| 461 | // similar behavior: |
| 462 | // http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19351 |
| 463 | // |
| 464 | // This will not be sufficient for C++0x, which requires a |
| 465 | // specific exception class (std::bad_array_new_length). |
| 466 | // That will require ABI support that has not yet been specified. |
| 467 | const llvm::Type *Types[] = { SizeTy }; |
| 468 | llvm::Value *UMulF |
| 469 | = CGF.CGM.getIntrinsic(llvm::Intrinsic::umul_with_overflow, Types, 1); |
| 470 | llvm::Value *MulRes = CGF.Builder.CreateCall2(UMulF, NumOutermostElements, |
| 471 | OutermostElementSize); |
| 472 | |
| 473 | // The overflow bit. |
| 474 | llvm::Value *DidOverflow = CGF.Builder.CreateExtractValue(MulRes, 1); |
| 475 | |
| 476 | // The result of the multiplication. |
| 477 | Size = CGF.Builder.CreateExtractValue(MulRes, 0); |
| 478 | |
| 479 | // If we have a cookie, we need to add that size in, too. |
| 480 | if (!CookieSize.isZero()) { |
| 481 | SizeWithoutCookie = Size; |
| 482 | |
| 483 | llvm::Value *CookieSizeV |
| 484 | = llvm::ConstantInt::get(SizeTy, CookieSize.getQuantity()); |
| 485 | llvm::Value *UAddF |
| 486 | = CGF.CGM.getIntrinsic(llvm::Intrinsic::uadd_with_overflow, Types, 1); |
| 487 | llvm::Value *AddRes |
| 488 | = CGF.Builder.CreateCall2(UAddF, SizeWithoutCookie, CookieSizeV); |
| 489 | |
| 490 | Size = CGF.Builder.CreateExtractValue(AddRes, 0); |
| 491 | |
| 492 | llvm::Value *AddDidOverflow = CGF.Builder.CreateExtractValue(AddRes, 1); |
| 493 | DidOverflow = CGF.Builder.CreateAnd(DidOverflow, AddDidOverflow); |
| 494 | } |
| 495 | |
| 496 | Size = CGF.Builder.CreateSelect(DidOverflow, |
| 497 | llvm::ConstantInt::get(SizeTy, -1), |
| 498 | Size); |
Chris Lattner | 806941e | 2010-07-20 21:55:52 +0000 | [diff] [blame] | 499 | } |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 500 | |
| 501 | if (CookieSize.isZero()) |
| 502 | SizeWithoutCookie = Size; |
| 503 | else |
| 504 | assert(SizeWithoutCookie && "didn't set SizeWithoutCookie?"); |
| 505 | |
Chris Lattner | 806941e | 2010-07-20 21:55:52 +0000 | [diff] [blame] | 506 | return Size; |
Anders Carlsson | a4d4c01 | 2009-09-23 16:07:23 +0000 | [diff] [blame] | 507 | } |
| 508 | |
Fariborz Jahanian | ef66872 | 2010-06-25 18:26:07 +0000 | [diff] [blame] | 509 | static void StoreAnyExprIntoOneUnit(CodeGenFunction &CGF, const CXXNewExpr *E, |
| 510 | llvm::Value *NewPtr) { |
Fariborz Jahanian | ef66872 | 2010-06-25 18:26:07 +0000 | [diff] [blame] | 511 | |
| 512 | assert(E->getNumConstructorArgs() == 1 && |
| 513 | "Can only have one argument to initializer of POD type."); |
| 514 | |
| 515 | const Expr *Init = E->getConstructorArg(0); |
| 516 | QualType AllocType = E->getAllocatedType(); |
Daniel Dunbar | 91a16fa | 2010-08-21 02:24:36 +0000 | [diff] [blame] | 517 | |
| 518 | unsigned Alignment = |
| 519 | CGF.getContext().getTypeAlignInChars(AllocType).getQuantity(); |
Fariborz Jahanian | ef66872 | 2010-06-25 18:26:07 +0000 | [diff] [blame] | 520 | if (!CGF.hasAggregateLLVMType(AllocType)) |
| 521 | CGF.EmitStoreOfScalar(CGF.EmitScalarExpr(Init), NewPtr, |
Daniel Dunbar | 91a16fa | 2010-08-21 02:24:36 +0000 | [diff] [blame] | 522 | AllocType.isVolatileQualified(), Alignment, |
| 523 | AllocType); |
Fariborz Jahanian | ef66872 | 2010-06-25 18:26:07 +0000 | [diff] [blame] | 524 | else if (AllocType->isAnyComplexType()) |
| 525 | CGF.EmitComplexExprIntoAddr(Init, NewPtr, |
| 526 | AllocType.isVolatileQualified()); |
| 527 | else |
| 528 | CGF.EmitAggExpr(Init, NewPtr, AllocType.isVolatileQualified()); |
| 529 | } |
| 530 | |
| 531 | void |
| 532 | CodeGenFunction::EmitNewArrayInitializer(const CXXNewExpr *E, |
| 533 | llvm::Value *NewPtr, |
| 534 | llvm::Value *NumElements) { |
Fariborz Jahanian | 5304c95 | 2010-06-25 20:01:13 +0000 | [diff] [blame] | 535 | // We have a POD type. |
| 536 | if (E->getNumConstructorArgs() == 0) |
| 537 | return; |
| 538 | |
Fariborz Jahanian | ef66872 | 2010-06-25 18:26:07 +0000 | [diff] [blame] | 539 | const llvm::Type *SizeTy = ConvertType(getContext().getSizeType()); |
| 540 | |
| 541 | // Create a temporary for the loop index and initialize it with 0. |
| 542 | llvm::Value *IndexPtr = CreateTempAlloca(SizeTy, "loop.index"); |
| 543 | llvm::Value *Zero = llvm::Constant::getNullValue(SizeTy); |
| 544 | Builder.CreateStore(Zero, IndexPtr); |
| 545 | |
| 546 | // Start the loop with a block that tests the condition. |
| 547 | llvm::BasicBlock *CondBlock = createBasicBlock("for.cond"); |
| 548 | llvm::BasicBlock *AfterFor = createBasicBlock("for.end"); |
| 549 | |
| 550 | EmitBlock(CondBlock); |
| 551 | |
| 552 | llvm::BasicBlock *ForBody = createBasicBlock("for.body"); |
| 553 | |
| 554 | // Generate: if (loop-index < number-of-elements fall to the loop body, |
| 555 | // otherwise, go to the block after the for-loop. |
| 556 | llvm::Value *Counter = Builder.CreateLoad(IndexPtr); |
| 557 | llvm::Value *IsLess = Builder.CreateICmpULT(Counter, NumElements, "isless"); |
| 558 | // If the condition is true, execute the body. |
| 559 | Builder.CreateCondBr(IsLess, ForBody, AfterFor); |
| 560 | |
| 561 | EmitBlock(ForBody); |
| 562 | |
| 563 | llvm::BasicBlock *ContinueBlock = createBasicBlock("for.inc"); |
| 564 | // Inside the loop body, emit the constructor call on the array element. |
| 565 | Counter = Builder.CreateLoad(IndexPtr); |
| 566 | llvm::Value *Address = Builder.CreateInBoundsGEP(NewPtr, Counter, |
| 567 | "arrayidx"); |
| 568 | StoreAnyExprIntoOneUnit(*this, E, Address); |
| 569 | |
| 570 | EmitBlock(ContinueBlock); |
| 571 | |
| 572 | // Emit the increment of the loop counter. |
| 573 | llvm::Value *NextVal = llvm::ConstantInt::get(SizeTy, 1); |
| 574 | Counter = Builder.CreateLoad(IndexPtr); |
| 575 | NextVal = Builder.CreateAdd(Counter, NextVal, "inc"); |
| 576 | Builder.CreateStore(NextVal, IndexPtr); |
| 577 | |
| 578 | // Finally, branch back up to the condition for the next iteration. |
| 579 | EmitBranch(CondBlock); |
| 580 | |
| 581 | // Emit the fall-through block. |
| 582 | EmitBlock(AfterFor, true); |
| 583 | } |
| 584 | |
Douglas Gregor | 59174c0 | 2010-07-21 01:10:17 +0000 | [diff] [blame] | 585 | static void EmitZeroMemSet(CodeGenFunction &CGF, QualType T, |
| 586 | llvm::Value *NewPtr, llvm::Value *Size) { |
| 587 | llvm::LLVMContext &VMContext = CGF.CGM.getLLVMContext(); |
| 588 | const llvm::Type *BP = llvm::Type::getInt8PtrTy(VMContext); |
| 589 | if (NewPtr->getType() != BP) |
| 590 | NewPtr = CGF.Builder.CreateBitCast(NewPtr, BP, "tmp"); |
| 591 | |
| 592 | CGF.Builder.CreateCall5(CGF.CGM.getMemSetFn(BP, CGF.IntPtrTy), NewPtr, |
| 593 | llvm::Constant::getNullValue(llvm::Type::getInt8Ty(VMContext)), |
| 594 | Size, |
| 595 | llvm::ConstantInt::get(CGF.Int32Ty, |
| 596 | CGF.getContext().getTypeAlign(T)/8), |
| 597 | llvm::ConstantInt::get(llvm::Type::getInt1Ty(VMContext), |
| 598 | 0)); |
| 599 | } |
| 600 | |
Anders Carlsson | a4d4c01 | 2009-09-23 16:07:23 +0000 | [diff] [blame] | 601 | static void EmitNewInitializer(CodeGenFunction &CGF, const CXXNewExpr *E, |
| 602 | llvm::Value *NewPtr, |
Douglas Gregor | 59174c0 | 2010-07-21 01:10:17 +0000 | [diff] [blame] | 603 | llvm::Value *NumElements, |
| 604 | llvm::Value *AllocSizeWithoutCookie) { |
Anders Carlsson | 5d4d946 | 2009-11-24 18:43:52 +0000 | [diff] [blame] | 605 | if (E->isArray()) { |
Anders Carlsson | e99bdb6 | 2010-05-03 15:09:17 +0000 | [diff] [blame] | 606 | if (CXXConstructorDecl *Ctor = E->getConstructor()) { |
Douglas Gregor | 59174c0 | 2010-07-21 01:10:17 +0000 | [diff] [blame] | 607 | bool RequiresZeroInitialization = false; |
| 608 | if (Ctor->getParent()->hasTrivialConstructor()) { |
| 609 | // If new expression did not specify value-initialization, then there |
| 610 | // is no initialization. |
| 611 | if (!E->hasInitializer() || Ctor->getParent()->isEmpty()) |
| 612 | return; |
| 613 | |
John McCall | f16aa10 | 2010-08-22 21:01:12 +0000 | [diff] [blame] | 614 | if (CGF.CGM.getTypes().isZeroInitializable(E->getAllocatedType())) { |
Douglas Gregor | 59174c0 | 2010-07-21 01:10:17 +0000 | [diff] [blame] | 615 | // Optimization: since zero initialization will just set the memory |
| 616 | // to all zeroes, generate a single memset to do it in one shot. |
| 617 | EmitZeroMemSet(CGF, E->getAllocatedType(), NewPtr, |
| 618 | AllocSizeWithoutCookie); |
| 619 | return; |
| 620 | } |
| 621 | |
| 622 | RequiresZeroInitialization = true; |
| 623 | } |
| 624 | |
| 625 | CGF.EmitCXXAggrConstructorCall(Ctor, NumElements, NewPtr, |
| 626 | E->constructor_arg_begin(), |
| 627 | E->constructor_arg_end(), |
| 628 | RequiresZeroInitialization); |
Anders Carlsson | e99bdb6 | 2010-05-03 15:09:17 +0000 | [diff] [blame] | 629 | return; |
Douglas Gregor | 59174c0 | 2010-07-21 01:10:17 +0000 | [diff] [blame] | 630 | } else if (E->getNumConstructorArgs() == 1 && |
| 631 | isa<ImplicitValueInitExpr>(E->getConstructorArg(0))) { |
| 632 | // Optimization: since zero initialization will just set the memory |
| 633 | // to all zeroes, generate a single memset to do it in one shot. |
| 634 | EmitZeroMemSet(CGF, E->getAllocatedType(), NewPtr, |
| 635 | AllocSizeWithoutCookie); |
| 636 | return; |
| 637 | } else { |
Fariborz Jahanian | ef66872 | 2010-06-25 18:26:07 +0000 | [diff] [blame] | 638 | CGF.EmitNewArrayInitializer(E, NewPtr, NumElements); |
| 639 | return; |
| 640 | } |
Anders Carlsson | a4d4c01 | 2009-09-23 16:07:23 +0000 | [diff] [blame] | 641 | } |
Anders Carlsson | 5d4d946 | 2009-11-24 18:43:52 +0000 | [diff] [blame] | 642 | |
| 643 | if (CXXConstructorDecl *Ctor = E->getConstructor()) { |
Douglas Gregor | ed8abf1 | 2010-07-08 06:14:04 +0000 | [diff] [blame] | 644 | // Per C++ [expr.new]p15, if we have an initializer, then we're performing |
| 645 | // direct initialization. C++ [dcl.init]p5 requires that we |
| 646 | // zero-initialize storage if there are no user-declared constructors. |
| 647 | if (E->hasInitializer() && |
| 648 | !Ctor->getParent()->hasUserDeclaredConstructor() && |
| 649 | !Ctor->getParent()->isEmpty()) |
| 650 | CGF.EmitNullInitialization(NewPtr, E->getAllocatedType()); |
| 651 | |
Douglas Gregor | 8474567 | 2010-07-07 23:37:33 +0000 | [diff] [blame] | 652 | CGF.EmitCXXConstructorCall(Ctor, Ctor_Complete, /*ForVirtualBase=*/false, |
| 653 | NewPtr, E->constructor_arg_begin(), |
| 654 | E->constructor_arg_end()); |
Anders Carlsson | 5d4d946 | 2009-11-24 18:43:52 +0000 | [diff] [blame] | 655 | |
| 656 | return; |
| 657 | } |
Fariborz Jahanian | 5304c95 | 2010-06-25 20:01:13 +0000 | [diff] [blame] | 658 | // We have a POD type. |
| 659 | if (E->getNumConstructorArgs() == 0) |
| 660 | return; |
| 661 | |
Fariborz Jahanian | ef66872 | 2010-06-25 18:26:07 +0000 | [diff] [blame] | 662 | StoreAnyExprIntoOneUnit(CGF, E, NewPtr); |
Anders Carlsson | a4d4c01 | 2009-09-23 16:07:23 +0000 | [diff] [blame] | 663 | } |
| 664 | |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 665 | llvm::Value *CodeGenFunction::EmitCXXNewExpr(const CXXNewExpr *E) { |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 666 | QualType AllocType = E->getAllocatedType(); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 667 | if (AllocType->isArrayType()) |
| 668 | while (const ArrayType *AType = getContext().getAsArrayType(AllocType)) |
| 669 | AllocType = AType->getElementType(); |
| 670 | |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 671 | FunctionDecl *NewFD = E->getOperatorNew(); |
| 672 | const FunctionProtoType *NewFTy = NewFD->getType()->getAs<FunctionProtoType>(); |
| 673 | |
| 674 | CallArgList NewArgs; |
| 675 | |
| 676 | // The allocation size is the first argument. |
| 677 | QualType SizeTy = getContext().getSizeType(); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 678 | |
Anders Carlsson | a4d4c01 | 2009-09-23 16:07:23 +0000 | [diff] [blame] | 679 | llvm::Value *NumElements = 0; |
Douglas Gregor | 59174c0 | 2010-07-21 01:10:17 +0000 | [diff] [blame] | 680 | llvm::Value *AllocSizeWithoutCookie = 0; |
Fariborz Jahanian | ceb43b6 | 2010-03-24 16:57:01 +0000 | [diff] [blame] | 681 | llvm::Value *AllocSize = EmitCXXNewAllocSize(getContext(), |
Douglas Gregor | 59174c0 | 2010-07-21 01:10:17 +0000 | [diff] [blame] | 682 | *this, E, NumElements, |
| 683 | AllocSizeWithoutCookie); |
Anders Carlsson | a4d4c01 | 2009-09-23 16:07:23 +0000 | [diff] [blame] | 684 | |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 685 | NewArgs.push_back(std::make_pair(RValue::get(AllocSize), SizeTy)); |
| 686 | |
| 687 | // Emit the rest of the arguments. |
| 688 | // FIXME: Ideally, this should just use EmitCallArgs. |
| 689 | CXXNewExpr::const_arg_iterator NewArg = E->placement_arg_begin(); |
| 690 | |
| 691 | // First, use the types from the function type. |
| 692 | // We start at 1 here because the first argument (the allocation size) |
| 693 | // has already been emitted. |
| 694 | for (unsigned i = 1, e = NewFTy->getNumArgs(); i != e; ++i, ++NewArg) { |
| 695 | QualType ArgType = NewFTy->getArgType(i); |
| 696 | |
| 697 | assert(getContext().getCanonicalType(ArgType.getNonReferenceType()). |
| 698 | getTypePtr() == |
| 699 | getContext().getCanonicalType(NewArg->getType()).getTypePtr() && |
| 700 | "type mismatch in call argument!"); |
| 701 | |
| 702 | NewArgs.push_back(std::make_pair(EmitCallArg(*NewArg, ArgType), |
| 703 | ArgType)); |
| 704 | |
| 705 | } |
| 706 | |
| 707 | // Either we've emitted all the call args, or we have a call to a |
| 708 | // variadic function. |
| 709 | assert((NewArg == E->placement_arg_end() || NewFTy->isVariadic()) && |
| 710 | "Extra arguments in non-variadic function!"); |
| 711 | |
| 712 | // If we still have any arguments, emit them using the type of the argument. |
| 713 | for (CXXNewExpr::const_arg_iterator NewArgEnd = E->placement_arg_end(); |
| 714 | NewArg != NewArgEnd; ++NewArg) { |
| 715 | QualType ArgType = NewArg->getType(); |
| 716 | NewArgs.push_back(std::make_pair(EmitCallArg(*NewArg, ArgType), |
| 717 | ArgType)); |
| 718 | } |
| 719 | |
| 720 | // Emit the call to new. |
| 721 | RValue RV = |
John McCall | 04a67a6 | 2010-02-05 21:31:56 +0000 | [diff] [blame] | 722 | EmitCall(CGM.getTypes().getFunctionInfo(NewArgs, NewFTy), |
Anders Carlsson | f3c47c9 | 2009-12-24 19:25:24 +0000 | [diff] [blame] | 723 | CGM.GetAddrOfFunction(NewFD), ReturnValueSlot(), NewArgs, NewFD); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 724 | |
| 725 | // If an allocation function is declared with an empty exception specification |
| 726 | // it returns null to indicate failure to allocate storage. [expr.new]p13. |
| 727 | // (We don't need to check for null when there's no new initializer and |
| 728 | // we're allocating a POD type). |
| 729 | bool NullCheckResult = NewFTy->hasEmptyExceptionSpec() && |
| 730 | !(AllocType->isPODType() && !E->hasInitializer()); |
| 731 | |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 732 | llvm::BasicBlock *NullCheckSource = 0; |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 733 | llvm::BasicBlock *NewNotNull = 0; |
| 734 | llvm::BasicBlock *NewEnd = 0; |
| 735 | |
| 736 | llvm::Value *NewPtr = RV.getScalarVal(); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 737 | unsigned AS = cast<llvm::PointerType>(NewPtr->getType())->getAddressSpace(); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 738 | |
| 739 | if (NullCheckResult) { |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 740 | NullCheckSource = Builder.GetInsertBlock(); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 741 | NewNotNull = createBasicBlock("new.notnull"); |
| 742 | NewEnd = createBasicBlock("new.end"); |
| 743 | |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 744 | llvm::Value *IsNull = Builder.CreateIsNull(NewPtr, "new.isnull"); |
| 745 | Builder.CreateCondBr(IsNull, NewEnd, NewNotNull); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 746 | EmitBlock(NewNotNull); |
| 747 | } |
Ken Dyck | caf647c | 2010-01-26 19:44:24 +0000 | [diff] [blame] | 748 | |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 749 | assert((AllocSize == AllocSizeWithoutCookie) == |
| 750 | CalculateCookiePadding(*this, E).isZero()); |
| 751 | if (AllocSize != AllocSizeWithoutCookie) { |
| 752 | assert(E->isArray()); |
| 753 | NewPtr = CGM.getCXXABI().InitializeArrayCookie(CGF, NewPtr, NumElements, |
| 754 | AllocType); |
| 755 | } |
Anders Carlsson | 6ac5fc4 | 2009-09-23 18:59:48 +0000 | [diff] [blame] | 756 | |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 757 | const llvm::Type *ElementPtrTy = ConvertType(AllocType)->getPointerTo(AS); |
| 758 | NewPtr = Builder.CreateBitCast(NewPtr, ElementPtrTy); |
| 759 | if (E->isArray()) { |
Douglas Gregor | 59174c0 | 2010-07-21 01:10:17 +0000 | [diff] [blame] | 760 | EmitNewInitializer(*this, E, NewPtr, NumElements, AllocSizeWithoutCookie); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 761 | |
| 762 | // NewPtr is a pointer to the base element type. If we're |
| 763 | // allocating an array of arrays, we'll need to cast back to the |
| 764 | // array pointer type. |
| 765 | const llvm::Type *ResultTy = ConvertType(E->getType()); |
| 766 | if (NewPtr->getType() != ResultTy) |
| 767 | NewPtr = Builder.CreateBitCast(NewPtr, ResultTy); |
| 768 | } else { |
Douglas Gregor | 59174c0 | 2010-07-21 01:10:17 +0000 | [diff] [blame] | 769 | EmitNewInitializer(*this, E, NewPtr, NumElements, AllocSizeWithoutCookie); |
Fariborz Jahanian | ceb43b6 | 2010-03-24 16:57:01 +0000 | [diff] [blame] | 770 | } |
| 771 | |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 772 | if (NullCheckResult) { |
| 773 | Builder.CreateBr(NewEnd); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 774 | llvm::BasicBlock *NotNullSource = Builder.GetInsertBlock(); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 775 | EmitBlock(NewEnd); |
| 776 | |
| 777 | llvm::PHINode *PHI = Builder.CreatePHI(NewPtr->getType()); |
| 778 | PHI->reserveOperandSpace(2); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 779 | PHI->addIncoming(NewPtr, NotNullSource); |
| 780 | PHI->addIncoming(llvm::Constant::getNullValue(NewPtr->getType()), |
| 781 | NullCheckSource); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 782 | |
| 783 | NewPtr = PHI; |
| 784 | } |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 785 | |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 786 | return NewPtr; |
| 787 | } |
| 788 | |
Eli Friedman | 5fe0598 | 2009-11-18 00:50:08 +0000 | [diff] [blame] | 789 | void CodeGenFunction::EmitDeleteCall(const FunctionDecl *DeleteFD, |
| 790 | llvm::Value *Ptr, |
| 791 | QualType DeleteTy) { |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 792 | assert(DeleteFD->getOverloadedOperator() == OO_Delete); |
| 793 | |
Eli Friedman | 5fe0598 | 2009-11-18 00:50:08 +0000 | [diff] [blame] | 794 | const FunctionProtoType *DeleteFTy = |
| 795 | DeleteFD->getType()->getAs<FunctionProtoType>(); |
| 796 | |
| 797 | CallArgList DeleteArgs; |
| 798 | |
Anders Carlsson | 871d078 | 2009-12-13 20:04:38 +0000 | [diff] [blame] | 799 | // Check if we need to pass the size to the delete operator. |
| 800 | llvm::Value *Size = 0; |
| 801 | QualType SizeTy; |
| 802 | if (DeleteFTy->getNumArgs() == 2) { |
| 803 | SizeTy = DeleteFTy->getArgType(1); |
Ken Dyck | 4f122ef | 2010-01-26 19:59:28 +0000 | [diff] [blame] | 804 | CharUnits DeleteTypeSize = getContext().getTypeSizeInChars(DeleteTy); |
| 805 | Size = llvm::ConstantInt::get(ConvertType(SizeTy), |
| 806 | DeleteTypeSize.getQuantity()); |
Anders Carlsson | 871d078 | 2009-12-13 20:04:38 +0000 | [diff] [blame] | 807 | } |
| 808 | |
Eli Friedman | 5fe0598 | 2009-11-18 00:50:08 +0000 | [diff] [blame] | 809 | QualType ArgTy = DeleteFTy->getArgType(0); |
| 810 | llvm::Value *DeletePtr = Builder.CreateBitCast(Ptr, ConvertType(ArgTy)); |
| 811 | DeleteArgs.push_back(std::make_pair(RValue::get(DeletePtr), ArgTy)); |
| 812 | |
Anders Carlsson | 871d078 | 2009-12-13 20:04:38 +0000 | [diff] [blame] | 813 | if (Size) |
Eli Friedman | 5fe0598 | 2009-11-18 00:50:08 +0000 | [diff] [blame] | 814 | DeleteArgs.push_back(std::make_pair(RValue::get(Size), SizeTy)); |
Eli Friedman | 5fe0598 | 2009-11-18 00:50:08 +0000 | [diff] [blame] | 815 | |
| 816 | // Emit the call to delete. |
John McCall | 04a67a6 | 2010-02-05 21:31:56 +0000 | [diff] [blame] | 817 | EmitCall(CGM.getTypes().getFunctionInfo(DeleteArgs, DeleteFTy), |
Anders Carlsson | f3c47c9 | 2009-12-24 19:25:24 +0000 | [diff] [blame] | 818 | CGM.GetAddrOfFunction(DeleteFD), ReturnValueSlot(), |
Eli Friedman | 5fe0598 | 2009-11-18 00:50:08 +0000 | [diff] [blame] | 819 | DeleteArgs, DeleteFD); |
| 820 | } |
| 821 | |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 822 | namespace { |
| 823 | /// Calls the given 'operator delete' on a single object. |
| 824 | struct CallObjectDelete : EHScopeStack::Cleanup { |
| 825 | llvm::Value *Ptr; |
| 826 | const FunctionDecl *OperatorDelete; |
| 827 | QualType ElementType; |
| 828 | |
| 829 | CallObjectDelete(llvm::Value *Ptr, |
| 830 | const FunctionDecl *OperatorDelete, |
| 831 | QualType ElementType) |
| 832 | : Ptr(Ptr), OperatorDelete(OperatorDelete), ElementType(ElementType) {} |
| 833 | |
| 834 | void Emit(CodeGenFunction &CGF, bool IsForEH) { |
| 835 | CGF.EmitDeleteCall(OperatorDelete, Ptr, ElementType); |
| 836 | } |
| 837 | }; |
| 838 | } |
| 839 | |
| 840 | /// Emit the code for deleting a single object. |
| 841 | static void EmitObjectDelete(CodeGenFunction &CGF, |
| 842 | const FunctionDecl *OperatorDelete, |
| 843 | llvm::Value *Ptr, |
| 844 | QualType ElementType) { |
| 845 | // Find the destructor for the type, if applicable. If the |
| 846 | // destructor is virtual, we'll just emit the vcall and return. |
| 847 | const CXXDestructorDecl *Dtor = 0; |
| 848 | if (const RecordType *RT = ElementType->getAs<RecordType>()) { |
| 849 | CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); |
| 850 | if (!RD->hasTrivialDestructor()) { |
| 851 | Dtor = RD->getDestructor(); |
| 852 | |
| 853 | if (Dtor->isVirtual()) { |
| 854 | const llvm::Type *Ty = |
| 855 | CGF.getTypes().GetFunctionType(CGF.getTypes().getFunctionInfo(Dtor), |
| 856 | /*isVariadic=*/false); |
| 857 | |
| 858 | llvm::Value *Callee |
| 859 | = CGF.BuildVirtualCall(Dtor, Dtor_Deleting, Ptr, Ty); |
| 860 | CGF.EmitCXXMemberCall(Dtor, Callee, ReturnValueSlot(), Ptr, /*VTT=*/0, |
| 861 | 0, 0); |
| 862 | |
| 863 | // The dtor took care of deleting the object. |
| 864 | return; |
| 865 | } |
| 866 | } |
| 867 | } |
| 868 | |
| 869 | // Make sure that we call delete even if the dtor throws. |
| 870 | CGF.EHStack.pushCleanup<CallObjectDelete>(NormalAndEHCleanup, |
| 871 | Ptr, OperatorDelete, ElementType); |
| 872 | |
| 873 | if (Dtor) |
| 874 | CGF.EmitCXXDestructorCall(Dtor, Dtor_Complete, |
| 875 | /*ForVirtualBase=*/false, Ptr); |
| 876 | |
| 877 | CGF.PopCleanupBlock(); |
| 878 | } |
| 879 | |
| 880 | namespace { |
| 881 | /// Calls the given 'operator delete' on an array of objects. |
| 882 | struct CallArrayDelete : EHScopeStack::Cleanup { |
| 883 | llvm::Value *Ptr; |
| 884 | const FunctionDecl *OperatorDelete; |
| 885 | llvm::Value *NumElements; |
| 886 | QualType ElementType; |
| 887 | CharUnits CookieSize; |
| 888 | |
| 889 | CallArrayDelete(llvm::Value *Ptr, |
| 890 | const FunctionDecl *OperatorDelete, |
| 891 | llvm::Value *NumElements, |
| 892 | QualType ElementType, |
| 893 | CharUnits CookieSize) |
| 894 | : Ptr(Ptr), OperatorDelete(OperatorDelete), NumElements(NumElements), |
| 895 | ElementType(ElementType), CookieSize(CookieSize) {} |
| 896 | |
| 897 | void Emit(CodeGenFunction &CGF, bool IsForEH) { |
| 898 | const FunctionProtoType *DeleteFTy = |
| 899 | OperatorDelete->getType()->getAs<FunctionProtoType>(); |
| 900 | assert(DeleteFTy->getNumArgs() == 1 || DeleteFTy->getNumArgs() == 2); |
| 901 | |
| 902 | CallArgList Args; |
| 903 | |
| 904 | // Pass the pointer as the first argument. |
| 905 | QualType VoidPtrTy = DeleteFTy->getArgType(0); |
| 906 | llvm::Value *DeletePtr |
| 907 | = CGF.Builder.CreateBitCast(Ptr, CGF.ConvertType(VoidPtrTy)); |
| 908 | Args.push_back(std::make_pair(RValue::get(DeletePtr), VoidPtrTy)); |
| 909 | |
| 910 | // Pass the original requested size as the second argument. |
| 911 | if (DeleteFTy->getNumArgs() == 2) { |
| 912 | QualType size_t = DeleteFTy->getArgType(1); |
| 913 | const llvm::IntegerType *SizeTy |
| 914 | = cast<llvm::IntegerType>(CGF.ConvertType(size_t)); |
| 915 | |
| 916 | CharUnits ElementTypeSize = |
| 917 | CGF.CGM.getContext().getTypeSizeInChars(ElementType); |
| 918 | |
| 919 | // The size of an element, multiplied by the number of elements. |
| 920 | llvm::Value *Size |
| 921 | = llvm::ConstantInt::get(SizeTy, ElementTypeSize.getQuantity()); |
| 922 | Size = CGF.Builder.CreateMul(Size, NumElements); |
| 923 | |
| 924 | // Plus the size of the cookie if applicable. |
| 925 | if (!CookieSize.isZero()) { |
| 926 | llvm::Value *CookieSizeV |
| 927 | = llvm::ConstantInt::get(SizeTy, CookieSize.getQuantity()); |
| 928 | Size = CGF.Builder.CreateAdd(Size, CookieSizeV); |
| 929 | } |
| 930 | |
| 931 | Args.push_back(std::make_pair(RValue::get(Size), size_t)); |
| 932 | } |
| 933 | |
| 934 | // Emit the call to delete. |
| 935 | CGF.EmitCall(CGF.getTypes().getFunctionInfo(Args, DeleteFTy), |
| 936 | CGF.CGM.GetAddrOfFunction(OperatorDelete), |
| 937 | ReturnValueSlot(), Args, OperatorDelete); |
| 938 | } |
| 939 | }; |
| 940 | } |
| 941 | |
| 942 | /// Emit the code for deleting an array of objects. |
| 943 | static void EmitArrayDelete(CodeGenFunction &CGF, |
| 944 | const FunctionDecl *OperatorDelete, |
| 945 | llvm::Value *Ptr, |
| 946 | QualType ElementType) { |
| 947 | llvm::Value *NumElements = 0; |
| 948 | llvm::Value *AllocatedPtr = 0; |
| 949 | CharUnits CookieSize; |
| 950 | CGF.CGM.getCXXABI().ReadArrayCookie(CGF, Ptr, ElementType, |
| 951 | NumElements, AllocatedPtr, CookieSize); |
| 952 | |
| 953 | assert(AllocatedPtr && "ReadArrayCookie didn't set AllocatedPtr"); |
| 954 | |
| 955 | // Make sure that we call delete even if one of the dtors throws. |
| 956 | CGF.EHStack.pushCleanup<CallArrayDelete>(NormalAndEHCleanup, |
| 957 | AllocatedPtr, OperatorDelete, |
| 958 | NumElements, ElementType, |
| 959 | CookieSize); |
| 960 | |
| 961 | if (const CXXRecordDecl *RD = ElementType->getAsCXXRecordDecl()) { |
| 962 | if (!RD->hasTrivialDestructor()) { |
| 963 | assert(NumElements && "ReadArrayCookie didn't find element count" |
| 964 | " for a class with destructor"); |
| 965 | CGF.EmitCXXAggrDestructorCall(RD->getDestructor(), NumElements, Ptr); |
| 966 | } |
| 967 | } |
| 968 | |
| 969 | CGF.PopCleanupBlock(); |
| 970 | } |
| 971 | |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 972 | void CodeGenFunction::EmitCXXDeleteExpr(const CXXDeleteExpr *E) { |
Fariborz Jahanian | 72c2153 | 2009-11-13 19:27:47 +0000 | [diff] [blame] | 973 | |
Douglas Gregor | 9091656 | 2009-09-29 18:16:17 +0000 | [diff] [blame] | 974 | // Get at the argument before we performed the implicit conversion |
| 975 | // to void*. |
| 976 | const Expr *Arg = E->getArgument(); |
| 977 | while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Arg)) { |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 978 | if (ICE->getCastKind() != CK_UserDefinedConversion && |
Douglas Gregor | 9091656 | 2009-09-29 18:16:17 +0000 | [diff] [blame] | 979 | ICE->getType()->isVoidPointerType()) |
| 980 | Arg = ICE->getSubExpr(); |
Douglas Gregor | d69dd78 | 2009-10-01 05:49:51 +0000 | [diff] [blame] | 981 | else |
| 982 | break; |
Douglas Gregor | 9091656 | 2009-09-29 18:16:17 +0000 | [diff] [blame] | 983 | } |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 984 | |
Douglas Gregor | 9091656 | 2009-09-29 18:16:17 +0000 | [diff] [blame] | 985 | llvm::Value *Ptr = EmitScalarExpr(Arg); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 986 | |
| 987 | // Null check the pointer. |
| 988 | llvm::BasicBlock *DeleteNotNull = createBasicBlock("delete.notnull"); |
| 989 | llvm::BasicBlock *DeleteEnd = createBasicBlock("delete.end"); |
| 990 | |
| 991 | llvm::Value *IsNull = |
| 992 | Builder.CreateICmpEQ(Ptr, llvm::Constant::getNullValue(Ptr->getType()), |
| 993 | "isnull"); |
| 994 | |
| 995 | Builder.CreateCondBr(IsNull, DeleteEnd, DeleteNotNull); |
| 996 | EmitBlock(DeleteNotNull); |
Anders Carlsson | 566abee | 2009-11-13 04:45:41 +0000 | [diff] [blame] | 997 | |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 998 | // We might be deleting a pointer to array. If so, GEP down to the |
| 999 | // first non-array element. |
| 1000 | // (this assumes that A(*)[3][7] is converted to [3 x [7 x %A]]*) |
| 1001 | QualType DeleteTy = Arg->getType()->getAs<PointerType>()->getPointeeType(); |
| 1002 | if (DeleteTy->isConstantArrayType()) { |
| 1003 | llvm::Value *Zero = Builder.getInt32(0); |
| 1004 | llvm::SmallVector<llvm::Value*,8> GEP; |
| 1005 | |
| 1006 | GEP.push_back(Zero); // point at the outermost array |
| 1007 | |
| 1008 | // For each layer of array type we're pointing at: |
| 1009 | while (const ConstantArrayType *Arr |
| 1010 | = getContext().getAsConstantArrayType(DeleteTy)) { |
| 1011 | // 1. Unpeel the array type. |
| 1012 | DeleteTy = Arr->getElementType(); |
| 1013 | |
| 1014 | // 2. GEP to the first element of the array. |
| 1015 | GEP.push_back(Zero); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 1016 | } |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 1017 | |
| 1018 | Ptr = Builder.CreateInBoundsGEP(Ptr, GEP.begin(), GEP.end(), "del.first"); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 1019 | } |
| 1020 | |
Douglas Gregor | eede61a | 2010-09-02 17:38:50 +0000 | [diff] [blame] | 1021 | assert(ConvertTypeForMem(DeleteTy) == |
| 1022 | cast<llvm::PointerType>(Ptr->getType())->getElementType()); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 1023 | |
| 1024 | if (E->isArrayForm()) { |
| 1025 | EmitArrayDelete(*this, E->getOperatorDelete(), Ptr, DeleteTy); |
| 1026 | } else { |
| 1027 | EmitObjectDelete(*this, E->getOperatorDelete(), Ptr, DeleteTy); |
| 1028 | } |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 1029 | |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 1030 | EmitBlock(DeleteEnd); |
| 1031 | } |
Mike Stump | c2e84ae | 2009-11-15 08:09:41 +0000 | [diff] [blame] | 1032 | |
| 1033 | llvm::Value * CodeGenFunction::EmitCXXTypeidExpr(const CXXTypeidExpr *E) { |
| 1034 | QualType Ty = E->getType(); |
| 1035 | const llvm::Type *LTy = ConvertType(Ty)->getPointerTo(); |
Anders Carlsson | 31b7f52 | 2009-12-11 02:46:30 +0000 | [diff] [blame] | 1036 | |
Anders Carlsson | 1d7088d | 2009-12-17 07:09:17 +0000 | [diff] [blame] | 1037 | if (E->isTypeOperand()) { |
| 1038 | llvm::Constant *TypeInfo = |
| 1039 | CGM.GetAddrOfRTTIDescriptor(E->getTypeOperand()); |
| 1040 | return Builder.CreateBitCast(TypeInfo, LTy); |
| 1041 | } |
| 1042 | |
Mike Stump | c2e84ae | 2009-11-15 08:09:41 +0000 | [diff] [blame] | 1043 | Expr *subE = E->getExprOperand(); |
Mike Stump | 5fae856 | 2009-11-17 22:33:00 +0000 | [diff] [blame] | 1044 | Ty = subE->getType(); |
| 1045 | CanQualType CanTy = CGM.getContext().getCanonicalType(Ty); |
| 1046 | Ty = CanTy.getUnqualifiedType().getNonReferenceType(); |
Mike Stump | c2e84ae | 2009-11-15 08:09:41 +0000 | [diff] [blame] | 1047 | if (const RecordType *RT = Ty->getAs<RecordType>()) { |
| 1048 | const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); |
| 1049 | if (RD->isPolymorphic()) { |
| 1050 | // FIXME: if subE is an lvalue do |
| 1051 | LValue Obj = EmitLValue(subE); |
| 1052 | llvm::Value *This = Obj.getAddress(); |
Mike Stump | f549e89 | 2009-11-15 16:52:53 +0000 | [diff] [blame] | 1053 | LTy = LTy->getPointerTo()->getPointerTo(); |
| 1054 | llvm::Value *V = Builder.CreateBitCast(This, LTy); |
| 1055 | // We need to do a zero check for *p, unless it has NonNullAttr. |
| 1056 | // FIXME: PointerType->hasAttr<NonNullAttr>() |
| 1057 | bool CanBeZero = false; |
Mike Stump | db519a4 | 2009-11-17 00:45:21 +0000 | [diff] [blame] | 1058 | if (UnaryOperator *UO = dyn_cast<UnaryOperator>(subE->IgnoreParens())) |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 1059 | if (UO->getOpcode() == UO_Deref) |
Mike Stump | f549e89 | 2009-11-15 16:52:53 +0000 | [diff] [blame] | 1060 | CanBeZero = true; |
| 1061 | if (CanBeZero) { |
| 1062 | llvm::BasicBlock *NonZeroBlock = createBasicBlock(); |
| 1063 | llvm::BasicBlock *ZeroBlock = createBasicBlock(); |
| 1064 | |
| 1065 | llvm::Value *Zero = llvm::Constant::getNullValue(LTy); |
| 1066 | Builder.CreateCondBr(Builder.CreateICmpNE(V, Zero), |
| 1067 | NonZeroBlock, ZeroBlock); |
| 1068 | EmitBlock(ZeroBlock); |
| 1069 | /// Call __cxa_bad_typeid |
| 1070 | const llvm::Type *ResultType = llvm::Type::getVoidTy(VMContext); |
| 1071 | const llvm::FunctionType *FTy; |
| 1072 | FTy = llvm::FunctionType::get(ResultType, false); |
| 1073 | llvm::Value *F = CGM.CreateRuntimeFunction(FTy, "__cxa_bad_typeid"); |
Mike Stump | c849c05 | 2009-11-16 06:50:58 +0000 | [diff] [blame] | 1074 | Builder.CreateCall(F)->setDoesNotReturn(); |
Mike Stump | f549e89 | 2009-11-15 16:52:53 +0000 | [diff] [blame] | 1075 | Builder.CreateUnreachable(); |
| 1076 | EmitBlock(NonZeroBlock); |
| 1077 | } |
Mike Stump | c2e84ae | 2009-11-15 08:09:41 +0000 | [diff] [blame] | 1078 | V = Builder.CreateLoad(V, "vtable"); |
| 1079 | V = Builder.CreateConstInBoundsGEP1_64(V, -1ULL); |
| 1080 | V = Builder.CreateLoad(V); |
| 1081 | return V; |
Anders Carlsson | 1d7088d | 2009-12-17 07:09:17 +0000 | [diff] [blame] | 1082 | } |
Mike Stump | c2e84ae | 2009-11-15 08:09:41 +0000 | [diff] [blame] | 1083 | } |
Anders Carlsson | 1d7088d | 2009-12-17 07:09:17 +0000 | [diff] [blame] | 1084 | return Builder.CreateBitCast(CGM.GetAddrOfRTTIDescriptor(Ty), LTy); |
Mike Stump | c2e84ae | 2009-11-15 08:09:41 +0000 | [diff] [blame] | 1085 | } |
Mike Stump | c849c05 | 2009-11-16 06:50:58 +0000 | [diff] [blame] | 1086 | |
| 1087 | llvm::Value *CodeGenFunction::EmitDynamicCast(llvm::Value *V, |
| 1088 | const CXXDynamicCastExpr *DCE) { |
Anders Carlsson | 1d7088d | 2009-12-17 07:09:17 +0000 | [diff] [blame] | 1089 | QualType SrcTy = DCE->getSubExpr()->getType(); |
| 1090 | QualType DestTy = DCE->getTypeAsWritten(); |
| 1091 | QualType InnerType = DestTy->getPointeeType(); |
| 1092 | |
Mike Stump | c849c05 | 2009-11-16 06:50:58 +0000 | [diff] [blame] | 1093 | const llvm::Type *LTy = ConvertType(DCE->getType()); |
Mike Stump | 2b35baf | 2009-11-16 22:52:20 +0000 | [diff] [blame] | 1094 | |
Mike Stump | c849c05 | 2009-11-16 06:50:58 +0000 | [diff] [blame] | 1095 | bool CanBeZero = false; |
Mike Stump | c849c05 | 2009-11-16 06:50:58 +0000 | [diff] [blame] | 1096 | bool ToVoid = false; |
Mike Stump | 2b35baf | 2009-11-16 22:52:20 +0000 | [diff] [blame] | 1097 | bool ThrowOnBad = false; |
Anders Carlsson | 1d7088d | 2009-12-17 07:09:17 +0000 | [diff] [blame] | 1098 | if (DestTy->isPointerType()) { |
Mike Stump | c849c05 | 2009-11-16 06:50:58 +0000 | [diff] [blame] | 1099 | // FIXME: if PointerType->hasAttr<NonNullAttr>(), we don't set this |
| 1100 | CanBeZero = true; |
| 1101 | if (InnerType->isVoidType()) |
| 1102 | ToVoid = true; |
| 1103 | } else { |
| 1104 | LTy = LTy->getPointerTo(); |
Douglas Gregor | 485ee32 | 2010-05-14 21:14:41 +0000 | [diff] [blame] | 1105 | |
| 1106 | // FIXME: What if exceptions are disabled? |
Mike Stump | c849c05 | 2009-11-16 06:50:58 +0000 | [diff] [blame] | 1107 | ThrowOnBad = true; |
| 1108 | } |
| 1109 | |
Anders Carlsson | 1d7088d | 2009-12-17 07:09:17 +0000 | [diff] [blame] | 1110 | if (SrcTy->isPointerType() || SrcTy->isReferenceType()) |
| 1111 | SrcTy = SrcTy->getPointeeType(); |
| 1112 | SrcTy = SrcTy.getUnqualifiedType(); |
| 1113 | |
Anders Carlsson | 6f0e485 | 2009-12-18 14:55:04 +0000 | [diff] [blame] | 1114 | if (DestTy->isPointerType() || DestTy->isReferenceType()) |
Anders Carlsson | 1d7088d | 2009-12-17 07:09:17 +0000 | [diff] [blame] | 1115 | DestTy = DestTy->getPointeeType(); |
| 1116 | DestTy = DestTy.getUnqualifiedType(); |
Mike Stump | c849c05 | 2009-11-16 06:50:58 +0000 | [diff] [blame] | 1117 | |
Mike Stump | c849c05 | 2009-11-16 06:50:58 +0000 | [diff] [blame] | 1118 | llvm::BasicBlock *ContBlock = createBasicBlock(); |
| 1119 | llvm::BasicBlock *NullBlock = 0; |
| 1120 | llvm::BasicBlock *NonZeroBlock = 0; |
| 1121 | if (CanBeZero) { |
| 1122 | NonZeroBlock = createBasicBlock(); |
| 1123 | NullBlock = createBasicBlock(); |
Anders Carlsson | 1d7088d | 2009-12-17 07:09:17 +0000 | [diff] [blame] | 1124 | Builder.CreateCondBr(Builder.CreateIsNotNull(V), NonZeroBlock, NullBlock); |
Mike Stump | c849c05 | 2009-11-16 06:50:58 +0000 | [diff] [blame] | 1125 | EmitBlock(NonZeroBlock); |
| 1126 | } |
| 1127 | |
Mike Stump | c849c05 | 2009-11-16 06:50:58 +0000 | [diff] [blame] | 1128 | llvm::BasicBlock *BadCastBlock = 0; |
Mike Stump | c849c05 | 2009-11-16 06:50:58 +0000 | [diff] [blame] | 1129 | |
Anders Carlsson | 1d7088d | 2009-12-17 07:09:17 +0000 | [diff] [blame] | 1130 | const llvm::Type *PtrDiffTy = ConvertType(getContext().getPointerDiffType()); |
Mike Stump | 2b35baf | 2009-11-16 22:52:20 +0000 | [diff] [blame] | 1131 | |
| 1132 | // See if this is a dynamic_cast(void*) |
| 1133 | if (ToVoid) { |
| 1134 | llvm::Value *This = V; |
| 1135 | V = Builder.CreateBitCast(This, PtrDiffTy->getPointerTo()->getPointerTo()); |
| 1136 | V = Builder.CreateLoad(V, "vtable"); |
| 1137 | V = Builder.CreateConstInBoundsGEP1_64(V, -2ULL); |
| 1138 | V = Builder.CreateLoad(V, "offset to top"); |
| 1139 | This = Builder.CreateBitCast(This, llvm::Type::getInt8PtrTy(VMContext)); |
| 1140 | V = Builder.CreateInBoundsGEP(This, V); |
| 1141 | V = Builder.CreateBitCast(V, LTy); |
| 1142 | } else { |
| 1143 | /// Call __dynamic_cast |
| 1144 | const llvm::Type *ResultType = llvm::Type::getInt8PtrTy(VMContext); |
| 1145 | const llvm::FunctionType *FTy; |
| 1146 | std::vector<const llvm::Type*> ArgTys; |
| 1147 | const llvm::Type *PtrToInt8Ty |
| 1148 | = llvm::Type::getInt8Ty(VMContext)->getPointerTo(); |
| 1149 | ArgTys.push_back(PtrToInt8Ty); |
| 1150 | ArgTys.push_back(PtrToInt8Ty); |
| 1151 | ArgTys.push_back(PtrToInt8Ty); |
| 1152 | ArgTys.push_back(PtrDiffTy); |
| 1153 | FTy = llvm::FunctionType::get(ResultType, ArgTys, false); |
Mike Stump | 2b35baf | 2009-11-16 22:52:20 +0000 | [diff] [blame] | 1154 | |
| 1155 | // FIXME: Calculate better hint. |
| 1156 | llvm::Value *hint = llvm::ConstantInt::get(PtrDiffTy, -1ULL); |
Anders Carlsson | 1d7088d | 2009-12-17 07:09:17 +0000 | [diff] [blame] | 1157 | |
| 1158 | assert(SrcTy->isRecordType() && "Src type must be record type!"); |
| 1159 | assert(DestTy->isRecordType() && "Dest type must be record type!"); |
| 1160 | |
Douglas Gregor | 154fe98 | 2009-12-23 22:04:40 +0000 | [diff] [blame] | 1161 | llvm::Value *SrcArg |
| 1162 | = CGM.GetAddrOfRTTIDescriptor(SrcTy.getUnqualifiedType()); |
| 1163 | llvm::Value *DestArg |
| 1164 | = CGM.GetAddrOfRTTIDescriptor(DestTy.getUnqualifiedType()); |
Anders Carlsson | 1d7088d | 2009-12-17 07:09:17 +0000 | [diff] [blame] | 1165 | |
Mike Stump | 2b35baf | 2009-11-16 22:52:20 +0000 | [diff] [blame] | 1166 | V = Builder.CreateBitCast(V, PtrToInt8Ty); |
| 1167 | V = Builder.CreateCall4(CGM.CreateRuntimeFunction(FTy, "__dynamic_cast"), |
Anders Carlsson | 1d7088d | 2009-12-17 07:09:17 +0000 | [diff] [blame] | 1168 | V, SrcArg, DestArg, hint); |
Mike Stump | 2b35baf | 2009-11-16 22:52:20 +0000 | [diff] [blame] | 1169 | V = Builder.CreateBitCast(V, LTy); |
| 1170 | |
| 1171 | if (ThrowOnBad) { |
| 1172 | BadCastBlock = createBasicBlock(); |
Anders Carlsson | 1d7088d | 2009-12-17 07:09:17 +0000 | [diff] [blame] | 1173 | Builder.CreateCondBr(Builder.CreateIsNotNull(V), ContBlock, BadCastBlock); |
Mike Stump | 2b35baf | 2009-11-16 22:52:20 +0000 | [diff] [blame] | 1174 | EmitBlock(BadCastBlock); |
Douglas Gregor | 485ee32 | 2010-05-14 21:14:41 +0000 | [diff] [blame] | 1175 | /// Invoke __cxa_bad_cast |
Mike Stump | 2b35baf | 2009-11-16 22:52:20 +0000 | [diff] [blame] | 1176 | ResultType = llvm::Type::getVoidTy(VMContext); |
| 1177 | const llvm::FunctionType *FBadTy; |
Mike Stump | fde17be | 2009-11-17 03:01:03 +0000 | [diff] [blame] | 1178 | FBadTy = llvm::FunctionType::get(ResultType, false); |
Mike Stump | 2b35baf | 2009-11-16 22:52:20 +0000 | [diff] [blame] | 1179 | llvm::Value *F = CGM.CreateRuntimeFunction(FBadTy, "__cxa_bad_cast"); |
Douglas Gregor | 485ee32 | 2010-05-14 21:14:41 +0000 | [diff] [blame] | 1180 | if (llvm::BasicBlock *InvokeDest = getInvokeDest()) { |
| 1181 | llvm::BasicBlock *Cont = createBasicBlock("invoke.cont"); |
| 1182 | Builder.CreateInvoke(F, Cont, InvokeDest)->setDoesNotReturn(); |
| 1183 | EmitBlock(Cont); |
| 1184 | } else { |
| 1185 | // FIXME: Does this ever make sense? |
| 1186 | Builder.CreateCall(F)->setDoesNotReturn(); |
| 1187 | } |
Mike Stump | 8b152b8 | 2009-11-17 00:08:50 +0000 | [diff] [blame] | 1188 | Builder.CreateUnreachable(); |
Mike Stump | 2b35baf | 2009-11-16 22:52:20 +0000 | [diff] [blame] | 1189 | } |
Mike Stump | c849c05 | 2009-11-16 06:50:58 +0000 | [diff] [blame] | 1190 | } |
| 1191 | |
| 1192 | if (CanBeZero) { |
| 1193 | Builder.CreateBr(ContBlock); |
| 1194 | EmitBlock(NullBlock); |
| 1195 | Builder.CreateBr(ContBlock); |
| 1196 | } |
| 1197 | EmitBlock(ContBlock); |
| 1198 | if (CanBeZero) { |
| 1199 | llvm::PHINode *PHI = Builder.CreatePHI(LTy); |
Mike Stump | 14431c1 | 2009-11-17 00:10:05 +0000 | [diff] [blame] | 1200 | PHI->reserveOperandSpace(2); |
Mike Stump | c849c05 | 2009-11-16 06:50:58 +0000 | [diff] [blame] | 1201 | PHI->addIncoming(V, NonZeroBlock); |
| 1202 | PHI->addIncoming(llvm::Constant::getNullValue(LTy), NullBlock); |
Mike Stump | c849c05 | 2009-11-16 06:50:58 +0000 | [diff] [blame] | 1203 | V = PHI; |
| 1204 | } |
| 1205 | |
| 1206 | return V; |
| 1207 | } |