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 | |
Devang Patel | c69e1cf | 2010-09-30 19:05:55 +0000 | [diff] [blame] | 14 | #include "clang/Frontend/CodeGenOptions.h" |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 15 | #include "CodeGenFunction.h" |
John McCall | 4c40d98 | 2010-08-31 07:33:07 +0000 | [diff] [blame] | 16 | #include "CGCXXABI.h" |
Fariborz Jahanian | 842ddd0 | 2010-05-20 21:38:57 +0000 | [diff] [blame] | 17 | #include "CGObjCRuntime.h" |
Devang Patel | c69e1cf | 2010-09-30 19:05:55 +0000 | [diff] [blame] | 18 | #include "CGDebugInfo.h" |
Chris Lattner | 6c552c1 | 2010-07-20 20:19:24 +0000 | [diff] [blame] | 19 | #include "llvm/Intrinsics.h" |
Anders Carlsson | ad3692bb | 2011-04-13 02:35:36 +0000 | [diff] [blame] | 20 | #include "llvm/Support/CallSite.h" |
| 21 | |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 22 | using namespace clang; |
| 23 | using namespace CodeGen; |
| 24 | |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 25 | RValue CodeGenFunction::EmitCXXMemberCall(const CXXMethodDecl *MD, |
| 26 | llvm::Value *Callee, |
| 27 | ReturnValueSlot ReturnValue, |
| 28 | llvm::Value *This, |
Anders Carlsson | c997d42 | 2010-01-02 01:01:18 +0000 | [diff] [blame] | 29 | llvm::Value *VTT, |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 30 | CallExpr::const_arg_iterator ArgBeg, |
| 31 | CallExpr::const_arg_iterator ArgEnd) { |
| 32 | assert(MD->isInstance() && |
| 33 | "Trying to emit a member call expr on a static method!"); |
| 34 | |
| 35 | const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>(); |
| 36 | |
| 37 | CallArgList Args; |
| 38 | |
| 39 | // Push the this ptr. |
| 40 | Args.push_back(std::make_pair(RValue::get(This), |
| 41 | MD->getThisType(getContext()))); |
| 42 | |
Anders Carlsson | c997d42 | 2010-01-02 01:01:18 +0000 | [diff] [blame] | 43 | // If there is a VTT parameter, emit it. |
| 44 | if (VTT) { |
| 45 | QualType T = getContext().getPointerType(getContext().VoidPtrTy); |
| 46 | Args.push_back(std::make_pair(RValue::get(VTT), T)); |
| 47 | } |
| 48 | |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 49 | // And the rest of the call args |
| 50 | EmitCallArgs(Args, FPT, ArgBeg, ArgEnd); |
| 51 | |
John McCall | 04a67a6 | 2010-02-05 21:31:56 +0000 | [diff] [blame] | 52 | QualType ResultType = FPT->getResultType(); |
Tilmann Scheller | 9c6082f | 2011-03-02 21:36:49 +0000 | [diff] [blame] | 53 | return EmitCall(CGM.getTypes().getFunctionInfo(ResultType, Args, |
| 54 | FPT->getExtInfo()), |
Rafael Espindola | 264ba48 | 2010-03-30 20:24:48 +0000 | [diff] [blame] | 55 | Callee, ReturnValue, Args, MD); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 56 | } |
| 57 | |
Anders Carlsson | 1679f5a | 2011-01-29 03:52:01 +0000 | [diff] [blame] | 58 | static const CXXRecordDecl *getMostDerivedClassDecl(const Expr *Base) { |
Anders Carlsson | 268ab8c | 2011-01-29 05:04:11 +0000 | [diff] [blame] | 59 | const Expr *E = Base; |
| 60 | |
| 61 | while (true) { |
| 62 | E = E->IgnoreParens(); |
| 63 | if (const CastExpr *CE = dyn_cast<CastExpr>(E)) { |
| 64 | if (CE->getCastKind() == CK_DerivedToBase || |
| 65 | CE->getCastKind() == CK_UncheckedDerivedToBase || |
| 66 | CE->getCastKind() == CK_NoOp) { |
| 67 | E = CE->getSubExpr(); |
| 68 | continue; |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | break; |
| 73 | } |
| 74 | |
| 75 | QualType DerivedType = E->getType(); |
Anders Carlsson | 1679f5a | 2011-01-29 03:52:01 +0000 | [diff] [blame] | 76 | if (const PointerType *PTy = DerivedType->getAs<PointerType>()) |
| 77 | DerivedType = PTy->getPointeeType(); |
| 78 | |
| 79 | return cast<CXXRecordDecl>(DerivedType->castAs<RecordType>()->getDecl()); |
| 80 | } |
| 81 | |
Anders Carlsson | cd0b32e | 2011-04-10 18:20:53 +0000 | [diff] [blame] | 82 | // FIXME: Ideally Expr::IgnoreParenNoopCasts should do this, but it doesn't do |
| 83 | // quite what we want. |
| 84 | static const Expr *skipNoOpCastsAndParens(const Expr *E) { |
| 85 | while (true) { |
| 86 | if (const ParenExpr *PE = dyn_cast<ParenExpr>(E)) { |
| 87 | E = PE->getSubExpr(); |
| 88 | continue; |
| 89 | } |
| 90 | |
| 91 | if (const CastExpr *CE = dyn_cast<CastExpr>(E)) { |
| 92 | if (CE->getCastKind() == CK_NoOp) { |
| 93 | E = CE->getSubExpr(); |
| 94 | continue; |
| 95 | } |
| 96 | } |
| 97 | if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E)) { |
| 98 | if (UO->getOpcode() == UO_Extension) { |
| 99 | E = UO->getSubExpr(); |
| 100 | continue; |
| 101 | } |
| 102 | } |
| 103 | return E; |
| 104 | } |
| 105 | } |
| 106 | |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 107 | /// canDevirtualizeMemberFunctionCalls - Checks whether virtual calls on given |
| 108 | /// expr can be devirtualized. |
Fariborz Jahanian | 7ac0ff2 | 2011-01-21 01:04:41 +0000 | [diff] [blame] | 109 | static bool canDevirtualizeMemberFunctionCalls(ASTContext &Context, |
| 110 | const Expr *Base, |
Anders Carlsson | bd2bfae | 2010-10-27 13:28:46 +0000 | [diff] [blame] | 111 | const CXXMethodDecl *MD) { |
| 112 | |
Anders Carlsson | 1679f5a | 2011-01-29 03:52:01 +0000 | [diff] [blame] | 113 | // When building with -fapple-kext, all calls must go through the vtable since |
| 114 | // the kernel linker can do runtime patching of vtables. |
Fariborz Jahanian | 7ac0ff2 | 2011-01-21 01:04:41 +0000 | [diff] [blame] | 115 | if (Context.getLangOptions().AppleKext) |
| 116 | return false; |
| 117 | |
Anders Carlsson | 1679f5a | 2011-01-29 03:52:01 +0000 | [diff] [blame] | 118 | // If the most derived class is marked final, we know that no subclass can |
| 119 | // override this member function and so we can devirtualize it. For example: |
| 120 | // |
| 121 | // struct A { virtual void f(); } |
| 122 | // struct B final : A { }; |
| 123 | // |
| 124 | // void f(B *b) { |
| 125 | // b->f(); |
| 126 | // } |
| 127 | // |
| 128 | const CXXRecordDecl *MostDerivedClassDecl = getMostDerivedClassDecl(Base); |
| 129 | if (MostDerivedClassDecl->hasAttr<FinalAttr>()) |
| 130 | return true; |
| 131 | |
Anders Carlsson | f89e042 | 2011-01-23 21:07:30 +0000 | [diff] [blame] | 132 | // If the member function is marked 'final', we know that it can't be |
Anders Carlsson | d66f428 | 2010-10-27 13:34:43 +0000 | [diff] [blame] | 133 | // overridden and can therefore devirtualize it. |
Anders Carlsson | cb88a1f | 2011-01-24 16:26:15 +0000 | [diff] [blame] | 134 | if (MD->hasAttr<FinalAttr>()) |
Anders Carlsson | bd2bfae | 2010-10-27 13:28:46 +0000 | [diff] [blame] | 135 | return true; |
Anders Carlsson | d66f428 | 2010-10-27 13:34:43 +0000 | [diff] [blame] | 136 | |
Anders Carlsson | f89e042 | 2011-01-23 21:07:30 +0000 | [diff] [blame] | 137 | // Similarly, if the class itself is marked 'final' it can't be overridden |
| 138 | // and we can therefore devirtualize the member function call. |
Anders Carlsson | cb88a1f | 2011-01-24 16:26:15 +0000 | [diff] [blame] | 139 | if (MD->getParent()->hasAttr<FinalAttr>()) |
Anders Carlsson | d66f428 | 2010-10-27 13:34:43 +0000 | [diff] [blame] | 140 | return true; |
| 141 | |
Anders Carlsson | cd0b32e | 2011-04-10 18:20:53 +0000 | [diff] [blame] | 142 | Base = skipNoOpCastsAndParens(Base); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 143 | if (const DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(Base)) { |
| 144 | if (const VarDecl *VD = dyn_cast<VarDecl>(DRE->getDecl())) { |
| 145 | // This is a record decl. We know the type and can devirtualize it. |
| 146 | return VD->getType()->isRecordType(); |
| 147 | } |
| 148 | |
| 149 | return false; |
| 150 | } |
| 151 | |
| 152 | // We can always devirtualize calls on temporary object expressions. |
Eli Friedman | 6997aae | 2010-01-31 20:58:15 +0000 | [diff] [blame] | 153 | if (isa<CXXConstructExpr>(Base)) |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 154 | return true; |
| 155 | |
| 156 | // And calls on bound temporaries. |
| 157 | if (isa<CXXBindTemporaryExpr>(Base)) |
| 158 | return true; |
| 159 | |
| 160 | // Check if this is a call expr that returns a record type. |
| 161 | if (const CallExpr *CE = dyn_cast<CallExpr>(Base)) |
| 162 | return CE->getCallReturnType()->isRecordType(); |
Anders Carlsson | bd2bfae | 2010-10-27 13:28:46 +0000 | [diff] [blame] | 163 | |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 164 | // We can't devirtualize the call. |
| 165 | return false; |
| 166 | } |
| 167 | |
Francois Pichet | dbee341 | 2011-01-18 05:04:39 +0000 | [diff] [blame] | 168 | // Note: This function also emit constructor calls to support a MSVC |
| 169 | // extensions allowing explicit constructor function call. |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 170 | RValue CodeGenFunction::EmitCXXMemberCallExpr(const CXXMemberCallExpr *CE, |
| 171 | ReturnValueSlot ReturnValue) { |
John McCall | 379b515 | 2011-04-11 07:02:50 +0000 | [diff] [blame] | 172 | const Expr *callee = CE->getCallee()->IgnoreParens(); |
| 173 | |
| 174 | if (isa<BinaryOperator>(callee)) |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 175 | return EmitCXXMemberPointerCallExpr(CE, ReturnValue); |
John McCall | 379b515 | 2011-04-11 07:02:50 +0000 | [diff] [blame] | 176 | |
| 177 | const MemberExpr *ME = cast<MemberExpr>(callee); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 178 | const CXXMethodDecl *MD = cast<CXXMethodDecl>(ME->getMemberDecl()); |
| 179 | |
Devang Patel | c69e1cf | 2010-09-30 19:05:55 +0000 | [diff] [blame] | 180 | CGDebugInfo *DI = getDebugInfo(); |
Devang Patel | 6802027 | 2010-10-22 18:56:27 +0000 | [diff] [blame] | 181 | if (DI && CGM.getCodeGenOpts().LimitDebugInfo |
| 182 | && !isa<CallExpr>(ME->getBase())) { |
Devang Patel | c69e1cf | 2010-09-30 19:05:55 +0000 | [diff] [blame] | 183 | QualType PQTy = ME->getBase()->IgnoreParenImpCasts()->getType(); |
| 184 | if (const PointerType * PTy = dyn_cast<PointerType>(PQTy)) { |
| 185 | DI->getOrCreateRecordType(PTy->getPointeeType(), |
| 186 | MD->getParent()->getLocation()); |
| 187 | } |
| 188 | } |
| 189 | |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 190 | if (MD->isStatic()) { |
| 191 | // The method is static, emit it as we would a regular call. |
| 192 | llvm::Value *Callee = CGM.GetAddrOfFunction(MD); |
| 193 | return EmitCall(getContext().getPointerType(MD->getType()), Callee, |
| 194 | ReturnValue, CE->arg_begin(), CE->arg_end()); |
| 195 | } |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 196 | |
John McCall | fc40028 | 2010-09-03 01:26:39 +0000 | [diff] [blame] | 197 | // Compute the object pointer. |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 198 | llvm::Value *This; |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 199 | if (ME->isArrow()) |
| 200 | This = EmitScalarExpr(ME->getBase()); |
John McCall | 0e800c9 | 2010-12-04 08:14:53 +0000 | [diff] [blame] | 201 | else |
| 202 | This = EmitLValue(ME->getBase()).getAddress(); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 203 | |
John McCall | fc40028 | 2010-09-03 01:26:39 +0000 | [diff] [blame] | 204 | if (MD->isTrivial()) { |
| 205 | if (isa<CXXDestructorDecl>(MD)) return RValue::get(0); |
Francois Pichet | dbee341 | 2011-01-18 05:04:39 +0000 | [diff] [blame] | 206 | if (isa<CXXConstructorDecl>(MD) && |
| 207 | cast<CXXConstructorDecl>(MD)->isDefaultConstructor()) |
| 208 | return RValue::get(0); |
John McCall | fc40028 | 2010-09-03 01:26:39 +0000 | [diff] [blame] | 209 | |
Francois Pichet | dbee341 | 2011-01-18 05:04:39 +0000 | [diff] [blame] | 210 | if (MD->isCopyAssignmentOperator()) { |
| 211 | // We don't like to generate the trivial copy assignment operator when |
| 212 | // it isn't necessary; just produce the proper effect here. |
| 213 | llvm::Value *RHS = EmitLValue(*CE->arg_begin()).getAddress(); |
| 214 | EmitAggregateCopy(This, RHS, CE->getType()); |
| 215 | return RValue::get(This); |
| 216 | } |
| 217 | |
| 218 | if (isa<CXXConstructorDecl>(MD) && |
| 219 | cast<CXXConstructorDecl>(MD)->isCopyConstructor()) { |
| 220 | llvm::Value *RHS = EmitLValue(*CE->arg_begin()).getAddress(); |
| 221 | EmitSynthesizedCXXCopyCtorCall(cast<CXXConstructorDecl>(MD), This, RHS, |
| 222 | CE->arg_begin(), CE->arg_end()); |
| 223 | return RValue::get(This); |
| 224 | } |
| 225 | llvm_unreachable("unknown trivial member function"); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 226 | } |
| 227 | |
John McCall | fc40028 | 2010-09-03 01:26:39 +0000 | [diff] [blame] | 228 | // Compute the function type we're calling. |
Francois Pichet | dbee341 | 2011-01-18 05:04:39 +0000 | [diff] [blame] | 229 | const CGFunctionInfo *FInfo = 0; |
| 230 | if (isa<CXXDestructorDecl>(MD)) |
| 231 | FInfo = &CGM.getTypes().getFunctionInfo(cast<CXXDestructorDecl>(MD), |
| 232 | Dtor_Complete); |
| 233 | else if (isa<CXXConstructorDecl>(MD)) |
| 234 | FInfo = &CGM.getTypes().getFunctionInfo(cast<CXXConstructorDecl>(MD), |
| 235 | Ctor_Complete); |
| 236 | else |
| 237 | FInfo = &CGM.getTypes().getFunctionInfo(MD); |
John McCall | fc40028 | 2010-09-03 01:26:39 +0000 | [diff] [blame] | 238 | |
| 239 | const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>(); |
| 240 | const llvm::Type *Ty |
Francois Pichet | dbee341 | 2011-01-18 05:04:39 +0000 | [diff] [blame] | 241 | = CGM.getTypes().GetFunctionType(*FInfo, FPT->isVariadic()); |
John McCall | fc40028 | 2010-09-03 01:26:39 +0000 | [diff] [blame] | 242 | |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 243 | // C++ [class.virtual]p12: |
| 244 | // Explicit qualification with the scope operator (5.1) suppresses the |
| 245 | // virtual call mechanism. |
| 246 | // |
| 247 | // We also don't emit a virtual call if the base expression has a record type |
| 248 | // because then we know what the type is. |
Fariborz Jahanian | 2726267 | 2011-01-20 17:19:02 +0000 | [diff] [blame] | 249 | bool UseVirtualCall; |
Fariborz Jahanian | 7ac0ff2 | 2011-01-21 01:04:41 +0000 | [diff] [blame] | 250 | UseVirtualCall = MD->isVirtual() && !ME->hasQualifier() |
| 251 | && !canDevirtualizeMemberFunctionCalls(getContext(), |
| 252 | ME->getBase(), MD); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 253 | llvm::Value *Callee; |
John McCall | fc40028 | 2010-09-03 01:26:39 +0000 | [diff] [blame] | 254 | if (const CXXDestructorDecl *Dtor = dyn_cast<CXXDestructorDecl>(MD)) { |
| 255 | if (UseVirtualCall) { |
| 256 | Callee = BuildVirtualCall(Dtor, Dtor_Complete, This, Ty); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 257 | } else { |
Fariborz Jahanian | ccd5259 | 2011-02-01 23:22:34 +0000 | [diff] [blame] | 258 | if (getContext().getLangOptions().AppleKext && |
| 259 | MD->isVirtual() && |
| 260 | ME->hasQualifier()) |
Fariborz Jahanian | 771c678 | 2011-02-03 19:27:17 +0000 | [diff] [blame] | 261 | Callee = BuildAppleKextVirtualCall(MD, ME->getQualifier(), Ty); |
Fariborz Jahanian | ccd5259 | 2011-02-01 23:22:34 +0000 | [diff] [blame] | 262 | else |
| 263 | Callee = CGM.GetAddrOfFunction(GlobalDecl(Dtor, Dtor_Complete), Ty); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 264 | } |
Francois Pichet | dbee341 | 2011-01-18 05:04:39 +0000 | [diff] [blame] | 265 | } else if (const CXXConstructorDecl *Ctor = |
| 266 | dyn_cast<CXXConstructorDecl>(MD)) { |
| 267 | Callee = CGM.GetAddrOfFunction(GlobalDecl(Ctor, Ctor_Complete), Ty); |
John McCall | fc40028 | 2010-09-03 01:26:39 +0000 | [diff] [blame] | 268 | } else if (UseVirtualCall) { |
Fariborz Jahanian | 2726267 | 2011-01-20 17:19:02 +0000 | [diff] [blame] | 269 | Callee = BuildVirtualCall(MD, This, Ty); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 270 | } else { |
Fariborz Jahanian | 7ac0ff2 | 2011-01-21 01:04:41 +0000 | [diff] [blame] | 271 | if (getContext().getLangOptions().AppleKext && |
Fariborz Jahanian | a50e33e | 2011-01-28 23:42:29 +0000 | [diff] [blame] | 272 | MD->isVirtual() && |
Fariborz Jahanian | 7ac0ff2 | 2011-01-21 01:04:41 +0000 | [diff] [blame] | 273 | ME->hasQualifier()) |
Fariborz Jahanian | 771c678 | 2011-02-03 19:27:17 +0000 | [diff] [blame] | 274 | Callee = BuildAppleKextVirtualCall(MD, ME->getQualifier(), Ty); |
Fariborz Jahanian | 7ac0ff2 | 2011-01-21 01:04:41 +0000 | [diff] [blame] | 275 | else |
| 276 | Callee = CGM.GetAddrOfFunction(MD, Ty); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 277 | } |
| 278 | |
Anders Carlsson | c997d42 | 2010-01-02 01:01:18 +0000 | [diff] [blame] | 279 | return EmitCXXMemberCall(MD, Callee, ReturnValue, This, /*VTT=*/0, |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 280 | CE->arg_begin(), CE->arg_end()); |
| 281 | } |
| 282 | |
| 283 | RValue |
| 284 | CodeGenFunction::EmitCXXMemberPointerCallExpr(const CXXMemberCallExpr *E, |
| 285 | ReturnValueSlot ReturnValue) { |
| 286 | const BinaryOperator *BO = |
| 287 | cast<BinaryOperator>(E->getCallee()->IgnoreParens()); |
| 288 | const Expr *BaseExpr = BO->getLHS(); |
| 289 | const Expr *MemFnExpr = BO->getRHS(); |
| 290 | |
| 291 | const MemberPointerType *MPT = |
| 292 | MemFnExpr->getType()->getAs<MemberPointerType>(); |
John McCall | 93d557b | 2010-08-22 00:05:51 +0000 | [diff] [blame] | 293 | |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 294 | const FunctionProtoType *FPT = |
| 295 | MPT->getPointeeType()->getAs<FunctionProtoType>(); |
| 296 | const CXXRecordDecl *RD = |
| 297 | cast<CXXRecordDecl>(MPT->getClass()->getAs<RecordType>()->getDecl()); |
| 298 | |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 299 | // Get the member function pointer. |
John McCall | d608cdb | 2010-08-22 10:59:02 +0000 | [diff] [blame] | 300 | llvm::Value *MemFnPtr = EmitScalarExpr(MemFnExpr); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 301 | |
| 302 | // Emit the 'this' pointer. |
| 303 | llvm::Value *This; |
| 304 | |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 305 | if (BO->getOpcode() == BO_PtrMemI) |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 306 | This = EmitScalarExpr(BaseExpr); |
| 307 | else |
| 308 | This = EmitLValue(BaseExpr).getAddress(); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 309 | |
John McCall | 93d557b | 2010-08-22 00:05:51 +0000 | [diff] [blame] | 310 | // Ask the ABI to load the callee. Note that This is modified. |
| 311 | llvm::Value *Callee = |
John McCall | d16c2cf | 2011-02-08 08:22:06 +0000 | [diff] [blame] | 312 | CGM.getCXXABI().EmitLoadOfMemberFunctionPointer(*this, This, MemFnPtr, MPT); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 313 | |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 314 | CallArgList Args; |
| 315 | |
| 316 | QualType ThisType = |
| 317 | getContext().getPointerType(getContext().getTagDeclType(RD)); |
| 318 | |
| 319 | // Push the this ptr. |
| 320 | Args.push_back(std::make_pair(RValue::get(This), ThisType)); |
| 321 | |
| 322 | // And the rest of the call args |
| 323 | EmitCallArgs(Args, FPT, E->arg_begin(), E->arg_end()); |
John McCall | 04a67a6 | 2010-02-05 21:31:56 +0000 | [diff] [blame] | 324 | const FunctionType *BO_FPT = BO->getType()->getAs<FunctionProtoType>(); |
Tilmann Scheller | 9c6082f | 2011-03-02 21:36:49 +0000 | [diff] [blame] | 325 | return EmitCall(CGM.getTypes().getFunctionInfo(Args, BO_FPT), Callee, |
| 326 | ReturnValue, Args); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 327 | } |
| 328 | |
| 329 | RValue |
| 330 | CodeGenFunction::EmitCXXOperatorMemberCallExpr(const CXXOperatorCallExpr *E, |
| 331 | const CXXMethodDecl *MD, |
| 332 | ReturnValueSlot ReturnValue) { |
| 333 | assert(MD->isInstance() && |
| 334 | "Trying to emit a member call expr on a static method!"); |
John McCall | 0e800c9 | 2010-12-04 08:14:53 +0000 | [diff] [blame] | 335 | LValue LV = EmitLValue(E->getArg(0)); |
| 336 | llvm::Value *This = LV.getAddress(); |
| 337 | |
Douglas Gregor | 3e9438b | 2010-09-27 22:37:28 +0000 | [diff] [blame] | 338 | if (MD->isCopyAssignmentOperator()) { |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 339 | const CXXRecordDecl *ClassDecl = cast<CXXRecordDecl>(MD->getDeclContext()); |
| 340 | if (ClassDecl->hasTrivialCopyAssignment()) { |
| 341 | assert(!ClassDecl->hasUserDeclaredCopyAssignment() && |
| 342 | "EmitCXXOperatorMemberCallExpr - user declared copy assignment"); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 343 | llvm::Value *Src = EmitLValue(E->getArg(1)).getAddress(); |
| 344 | QualType Ty = E->getType(); |
Fariborz Jahanian | 55bcace | 2010-06-15 22:44:06 +0000 | [diff] [blame] | 345 | EmitAggregateCopy(This, Src, Ty); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 346 | return RValue::get(This); |
| 347 | } |
| 348 | } |
| 349 | |
| 350 | const FunctionProtoType *FPT = MD->getType()->getAs<FunctionProtoType>(); |
| 351 | const llvm::Type *Ty = |
| 352 | CGM.getTypes().GetFunctionType(CGM.getTypes().getFunctionInfo(MD), |
| 353 | FPT->isVariadic()); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 354 | llvm::Value *Callee; |
Fariborz Jahanian | 2726267 | 2011-01-20 17:19:02 +0000 | [diff] [blame] | 355 | if (MD->isVirtual() && |
Fariborz Jahanian | 7ac0ff2 | 2011-01-21 01:04:41 +0000 | [diff] [blame] | 356 | !canDevirtualizeMemberFunctionCalls(getContext(), |
| 357 | E->getArg(0), MD)) |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 358 | Callee = BuildVirtualCall(MD, This, Ty); |
| 359 | else |
| 360 | Callee = CGM.GetAddrOfFunction(MD, Ty); |
| 361 | |
Anders Carlsson | c997d42 | 2010-01-02 01:01:18 +0000 | [diff] [blame] | 362 | return EmitCXXMemberCall(MD, Callee, ReturnValue, This, /*VTT=*/0, |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 363 | E->arg_begin() + 1, E->arg_end()); |
| 364 | } |
| 365 | |
| 366 | void |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 367 | CodeGenFunction::EmitCXXConstructExpr(const CXXConstructExpr *E, |
| 368 | AggValueSlot Dest) { |
| 369 | assert(!Dest.isIgnored() && "Must have a destination!"); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 370 | const CXXConstructorDecl *CD = E->getConstructor(); |
Douglas Gregor | 759e41b | 2010-08-22 16:15:35 +0000 | [diff] [blame] | 371 | |
| 372 | // If we require zero initialization before (or instead of) calling the |
| 373 | // constructor, as can be the case with a non-user-provided default |
| 374 | // constructor, emit the zero initialization now. |
| 375 | if (E->requiresZeroInitialization()) |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 376 | EmitNullInitialization(Dest.getAddr(), E->getType()); |
Douglas Gregor | 759e41b | 2010-08-22 16:15:35 +0000 | [diff] [blame] | 377 | |
| 378 | // If this is a call to a trivial default constructor, do nothing. |
| 379 | if (CD->isTrivial() && CD->isDefaultConstructor()) |
| 380 | return; |
| 381 | |
John McCall | fc1e6c7 | 2010-09-18 00:58:34 +0000 | [diff] [blame] | 382 | // Elide the constructor if we're constructing from a temporary. |
| 383 | // The temporary check is required because Sema sets this on NRVO |
| 384 | // returns. |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 385 | if (getContext().getLangOptions().ElideConstructors && E->isElidable()) { |
John McCall | fc1e6c7 | 2010-09-18 00:58:34 +0000 | [diff] [blame] | 386 | assert(getContext().hasSameUnqualifiedType(E->getType(), |
| 387 | E->getArg(0)->getType())); |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 388 | if (E->getArg(0)->isTemporaryObject(getContext(), CD->getParent())) { |
| 389 | EmitAggExpr(E->getArg(0), Dest); |
Douglas Gregor | 3c9034c | 2010-05-15 00:13:29 +0000 | [diff] [blame] | 390 | return; |
| 391 | } |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 392 | } |
Douglas Gregor | 759e41b | 2010-08-22 16:15:35 +0000 | [diff] [blame] | 393 | |
| 394 | const ConstantArrayType *Array |
| 395 | = getContext().getAsConstantArrayType(E->getType()); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 396 | if (Array) { |
| 397 | QualType BaseElementTy = getContext().getBaseElementType(Array); |
| 398 | const llvm::Type *BasePtr = ConvertType(BaseElementTy); |
| 399 | BasePtr = llvm::PointerType::getUnqual(BasePtr); |
| 400 | llvm::Value *BaseAddrPtr = |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 401 | Builder.CreateBitCast(Dest.getAddr(), BasePtr); |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 402 | |
| 403 | EmitCXXAggrConstructorCall(CD, Array, BaseAddrPtr, |
| 404 | E->arg_begin(), E->arg_end()); |
| 405 | } |
Anders Carlsson | 155ed4a | 2010-05-02 23:20:53 +0000 | [diff] [blame] | 406 | else { |
| 407 | CXXCtorType Type = |
| 408 | (E->getConstructionKind() == CXXConstructExpr::CK_Complete) |
| 409 | ? Ctor_Complete : Ctor_Base; |
| 410 | bool ForVirtualBase = |
| 411 | E->getConstructionKind() == CXXConstructExpr::CK_VirtualBase; |
| 412 | |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 413 | // Call the constructor. |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 414 | EmitCXXConstructorCall(CD, Type, ForVirtualBase, Dest.getAddr(), |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 415 | E->arg_begin(), E->arg_end()); |
Anders Carlsson | 155ed4a | 2010-05-02 23:20:53 +0000 | [diff] [blame] | 416 | } |
Anders Carlsson | 3b5ad22 | 2010-01-01 20:29:01 +0000 | [diff] [blame] | 417 | } |
| 418 | |
Fariborz Jahanian | 3499987 | 2010-11-13 21:53:34 +0000 | [diff] [blame] | 419 | void |
| 420 | CodeGenFunction::EmitSynthesizedCXXCopyCtor(llvm::Value *Dest, |
| 421 | llvm::Value *Src, |
Fariborz Jahanian | 830937b | 2010-12-02 17:02:11 +0000 | [diff] [blame] | 422 | const Expr *Exp) { |
John McCall | 4765fa0 | 2010-12-06 08:20:24 +0000 | [diff] [blame] | 423 | if (const ExprWithCleanups *E = dyn_cast<ExprWithCleanups>(Exp)) |
Fariborz Jahanian | 3499987 | 2010-11-13 21:53:34 +0000 | [diff] [blame] | 424 | Exp = E->getSubExpr(); |
| 425 | assert(isa<CXXConstructExpr>(Exp) && |
| 426 | "EmitSynthesizedCXXCopyCtor - unknown copy ctor expr"); |
| 427 | const CXXConstructExpr* E = cast<CXXConstructExpr>(Exp); |
| 428 | const CXXConstructorDecl *CD = E->getConstructor(); |
| 429 | RunCleanupsScope Scope(*this); |
| 430 | |
| 431 | // If we require zero initialization before (or instead of) calling the |
| 432 | // constructor, as can be the case with a non-user-provided default |
| 433 | // constructor, emit the zero initialization now. |
| 434 | // FIXME. Do I still need this for a copy ctor synthesis? |
| 435 | if (E->requiresZeroInitialization()) |
| 436 | EmitNullInitialization(Dest, E->getType()); |
| 437 | |
Chandler Carruth | 858a546 | 2010-11-15 13:54:43 +0000 | [diff] [blame] | 438 | assert(!getContext().getAsConstantArrayType(E->getType()) |
| 439 | && "EmitSynthesizedCXXCopyCtor - Copied-in Array"); |
Fariborz Jahanian | 3499987 | 2010-11-13 21:53:34 +0000 | [diff] [blame] | 440 | EmitSynthesizedCXXCopyCtorCall(CD, Dest, Src, |
| 441 | E->arg_begin(), E->arg_end()); |
| 442 | } |
| 443 | |
John McCall | 5172ed9 | 2010-08-23 01:17:59 +0000 | [diff] [blame] | 444 | /// Check whether the given operator new[] is the global placement |
| 445 | /// operator new[]. |
| 446 | static bool IsPlacementOperatorNewArray(ASTContext &Ctx, |
| 447 | const FunctionDecl *Fn) { |
| 448 | // Must be in global scope. Note that allocation functions can't be |
| 449 | // declared in namespaces. |
Sebastian Redl | 7a126a4 | 2010-08-31 00:36:30 +0000 | [diff] [blame] | 450 | if (!Fn->getDeclContext()->getRedeclContext()->isFileContext()) |
John McCall | 5172ed9 | 2010-08-23 01:17:59 +0000 | [diff] [blame] | 451 | return false; |
| 452 | |
| 453 | // Signature must be void *operator new[](size_t, void*). |
| 454 | // The size_t is common to all operator new[]s. |
| 455 | if (Fn->getNumParams() != 2) |
| 456 | return false; |
| 457 | |
| 458 | CanQualType ParamType = Ctx.getCanonicalType(Fn->getParamDecl(1)->getType()); |
| 459 | return (ParamType == Ctx.VoidPtrTy); |
| 460 | } |
| 461 | |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 462 | static CharUnits CalculateCookiePadding(CodeGenFunction &CGF, |
| 463 | const CXXNewExpr *E) { |
Anders Carlsson | 871d078 | 2009-12-13 20:04:38 +0000 | [diff] [blame] | 464 | if (!E->isArray()) |
Ken Dyck | caf647c | 2010-01-26 19:44:24 +0000 | [diff] [blame] | 465 | return CharUnits::Zero(); |
Anders Carlsson | 871d078 | 2009-12-13 20:04:38 +0000 | [diff] [blame] | 466 | |
Anders Carlsson | dd93755 | 2009-12-13 20:34:34 +0000 | [diff] [blame] | 467 | // No cookie is required if the new operator being used is |
| 468 | // ::operator new[](size_t, void*). |
| 469 | const FunctionDecl *OperatorNew = E->getOperatorNew(); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 470 | if (IsPlacementOperatorNewArray(CGF.getContext(), OperatorNew)) |
John McCall | 5172ed9 | 2010-08-23 01:17:59 +0000 | [diff] [blame] | 471 | return CharUnits::Zero(); |
| 472 | |
John McCall | 6ec278d | 2011-01-27 09:37:56 +0000 | [diff] [blame] | 473 | return CGF.CGM.getCXXABI().GetArrayCookieSize(E); |
Anders Carlsson | a4d4c01 | 2009-09-23 16:07:23 +0000 | [diff] [blame] | 474 | } |
| 475 | |
Fariborz Jahanian | ceb43b6 | 2010-03-24 16:57:01 +0000 | [diff] [blame] | 476 | static llvm::Value *EmitCXXNewAllocSize(ASTContext &Context, |
Chris Lattner | defe8b2 | 2010-07-20 18:45:57 +0000 | [diff] [blame] | 477 | CodeGenFunction &CGF, |
Anders Carlsson | a4d4c01 | 2009-09-23 16:07:23 +0000 | [diff] [blame] | 478 | const CXXNewExpr *E, |
Douglas Gregor | 59174c0 | 2010-07-21 01:10:17 +0000 | [diff] [blame] | 479 | llvm::Value *&NumElements, |
| 480 | llvm::Value *&SizeWithoutCookie) { |
Argyrios Kyrtzidis | e7ab92e | 2010-08-26 15:23:38 +0000 | [diff] [blame] | 481 | QualType ElemType = E->getAllocatedType(); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 482 | |
| 483 | const llvm::IntegerType *SizeTy = |
| 484 | cast<llvm::IntegerType>(CGF.ConvertType(CGF.getContext().getSizeType())); |
Anders Carlsson | a4d4c01 | 2009-09-23 16:07:23 +0000 | [diff] [blame] | 485 | |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 486 | CharUnits TypeSize = CGF.getContext().getTypeSizeInChars(ElemType); |
| 487 | |
Douglas Gregor | 59174c0 | 2010-07-21 01:10:17 +0000 | [diff] [blame] | 488 | if (!E->isArray()) { |
| 489 | SizeWithoutCookie = llvm::ConstantInt::get(SizeTy, TypeSize.getQuantity()); |
| 490 | return SizeWithoutCookie; |
| 491 | } |
Anders Carlsson | a4d4c01 | 2009-09-23 16:07:23 +0000 | [diff] [blame] | 492 | |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 493 | // Figure out the cookie size. |
| 494 | CharUnits CookieSize = CalculateCookiePadding(CGF, E); |
| 495 | |
Anders Carlsson | a4d4c01 | 2009-09-23 16:07:23 +0000 | [diff] [blame] | 496 | // Emit the array size expression. |
Argyrios Kyrtzidis | e7ab92e | 2010-08-26 15:23:38 +0000 | [diff] [blame] | 497 | // We multiply the size of all dimensions for NumElements. |
| 498 | // 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] | 499 | NumElements = CGF.EmitScalarExpr(E->getArraySize()); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 500 | assert(NumElements->getType() == SizeTy && "element count not a size_t"); |
| 501 | |
| 502 | uint64_t ArraySizeMultiplier = 1; |
Argyrios Kyrtzidis | e7ab92e | 2010-08-26 15:23:38 +0000 | [diff] [blame] | 503 | while (const ConstantArrayType *CAT |
| 504 | = CGF.getContext().getAsConstantArrayType(ElemType)) { |
| 505 | ElemType = CAT->getElementType(); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 506 | ArraySizeMultiplier *= CAT->getSize().getZExtValue(); |
Argyrios Kyrtzidis | e7ab92e | 2010-08-26 15:23:38 +0000 | [diff] [blame] | 507 | } |
| 508 | |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 509 | llvm::Value *Size; |
Chris Lattner | 83252dc | 2010-07-20 21:07:09 +0000 | [diff] [blame] | 510 | |
Chris Lattner | 806941e | 2010-07-20 21:55:52 +0000 | [diff] [blame] | 511 | // If someone is doing 'new int[42]' there is no need to do a dynamic check. |
| 512 | // Don't bloat the -O0 code. |
| 513 | if (llvm::ConstantInt *NumElementsC = |
| 514 | dyn_cast<llvm::ConstantInt>(NumElements)) { |
Chris Lattner | 806941e | 2010-07-20 21:55:52 +0000 | [diff] [blame] | 515 | llvm::APInt NEC = NumElementsC->getValue(); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 516 | unsigned SizeWidth = NEC.getBitWidth(); |
| 517 | |
| 518 | // Determine if there is an overflow here by doing an extended multiply. |
Jay Foad | 9f71a8f | 2010-12-07 08:25:34 +0000 | [diff] [blame] | 519 | NEC = NEC.zext(SizeWidth*2); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 520 | llvm::APInt SC(SizeWidth*2, TypeSize.getQuantity()); |
Chris Lattner | 806941e | 2010-07-20 21:55:52 +0000 | [diff] [blame] | 521 | SC *= NEC; |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 522 | |
| 523 | if (!CookieSize.isZero()) { |
| 524 | // Save the current size without a cookie. We don't care if an |
| 525 | // overflow's already happened because SizeWithoutCookie isn't |
| 526 | // used if the allocator returns null or throws, as it should |
| 527 | // always do on an overflow. |
Jay Foad | 9f71a8f | 2010-12-07 08:25:34 +0000 | [diff] [blame] | 528 | llvm::APInt SWC = SC.trunc(SizeWidth); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 529 | SizeWithoutCookie = llvm::ConstantInt::get(SizeTy, SWC); |
| 530 | |
| 531 | // Add the cookie size. |
| 532 | SC += llvm::APInt(SizeWidth*2, CookieSize.getQuantity()); |
Chris Lattner | 806941e | 2010-07-20 21:55:52 +0000 | [diff] [blame] | 533 | } |
| 534 | |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 535 | if (SC.countLeadingZeros() >= SizeWidth) { |
Jay Foad | 9f71a8f | 2010-12-07 08:25:34 +0000 | [diff] [blame] | 536 | SC = SC.trunc(SizeWidth); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 537 | Size = llvm::ConstantInt::get(SizeTy, SC); |
| 538 | } else { |
| 539 | // On overflow, produce a -1 so operator new throws. |
| 540 | Size = llvm::Constant::getAllOnesValue(SizeTy); |
| 541 | } |
Anders Carlsson | a4d4c01 | 2009-09-23 16:07:23 +0000 | [diff] [blame] | 542 | |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 543 | // Scale NumElements while we're at it. |
| 544 | uint64_t N = NEC.getZExtValue() * ArraySizeMultiplier; |
| 545 | NumElements = llvm::ConstantInt::get(SizeTy, N); |
| 546 | |
| 547 | // Otherwise, we don't need to do an overflow-checked multiplication if |
| 548 | // we're multiplying by one. |
| 549 | } else if (TypeSize.isOne()) { |
| 550 | assert(ArraySizeMultiplier == 1); |
| 551 | |
| 552 | Size = NumElements; |
| 553 | |
| 554 | // If we need a cookie, add its size in with an overflow check. |
| 555 | // This is maybe a little paranoid. |
| 556 | if (!CookieSize.isZero()) { |
| 557 | SizeWithoutCookie = Size; |
| 558 | |
| 559 | llvm::Value *CookieSizeV |
| 560 | = llvm::ConstantInt::get(SizeTy, CookieSize.getQuantity()); |
| 561 | |
| 562 | const llvm::Type *Types[] = { SizeTy }; |
| 563 | llvm::Value *UAddF |
| 564 | = CGF.CGM.getIntrinsic(llvm::Intrinsic::uadd_with_overflow, Types, 1); |
| 565 | llvm::Value *AddRes |
| 566 | = CGF.Builder.CreateCall2(UAddF, Size, CookieSizeV); |
| 567 | |
| 568 | Size = CGF.Builder.CreateExtractValue(AddRes, 0); |
| 569 | llvm::Value *DidOverflow = CGF.Builder.CreateExtractValue(AddRes, 1); |
| 570 | Size = CGF.Builder.CreateSelect(DidOverflow, |
| 571 | llvm::ConstantInt::get(SizeTy, -1), |
| 572 | Size); |
| 573 | } |
| 574 | |
| 575 | // Otherwise use the int.umul.with.overflow intrinsic. |
| 576 | } else { |
| 577 | llvm::Value *OutermostElementSize |
| 578 | = llvm::ConstantInt::get(SizeTy, TypeSize.getQuantity()); |
| 579 | |
| 580 | llvm::Value *NumOutermostElements = NumElements; |
| 581 | |
| 582 | // Scale NumElements by the array size multiplier. This might |
| 583 | // overflow, but only if the multiplication below also overflows, |
| 584 | // in which case this multiplication isn't used. |
| 585 | if (ArraySizeMultiplier != 1) |
| 586 | NumElements = CGF.Builder.CreateMul(NumElements, |
| 587 | llvm::ConstantInt::get(SizeTy, ArraySizeMultiplier)); |
| 588 | |
| 589 | // The requested size of the outermost array is non-constant. |
| 590 | // Multiply that by the static size of the elements of that array; |
| 591 | // on unsigned overflow, set the size to -1 to trigger an |
| 592 | // exception from the allocation routine. This is sufficient to |
| 593 | // prevent buffer overruns from the allocator returning a |
| 594 | // seemingly valid pointer to insufficient space. This idea comes |
| 595 | // originally from MSVC, and GCC has an open bug requesting |
| 596 | // similar behavior: |
| 597 | // http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19351 |
| 598 | // |
| 599 | // This will not be sufficient for C++0x, which requires a |
| 600 | // specific exception class (std::bad_array_new_length). |
| 601 | // That will require ABI support that has not yet been specified. |
| 602 | const llvm::Type *Types[] = { SizeTy }; |
| 603 | llvm::Value *UMulF |
| 604 | = CGF.CGM.getIntrinsic(llvm::Intrinsic::umul_with_overflow, Types, 1); |
| 605 | llvm::Value *MulRes = CGF.Builder.CreateCall2(UMulF, NumOutermostElements, |
| 606 | OutermostElementSize); |
| 607 | |
| 608 | // The overflow bit. |
| 609 | llvm::Value *DidOverflow = CGF.Builder.CreateExtractValue(MulRes, 1); |
| 610 | |
| 611 | // The result of the multiplication. |
| 612 | Size = CGF.Builder.CreateExtractValue(MulRes, 0); |
| 613 | |
| 614 | // If we have a cookie, we need to add that size in, too. |
| 615 | if (!CookieSize.isZero()) { |
| 616 | SizeWithoutCookie = Size; |
| 617 | |
| 618 | llvm::Value *CookieSizeV |
| 619 | = llvm::ConstantInt::get(SizeTy, CookieSize.getQuantity()); |
| 620 | llvm::Value *UAddF |
| 621 | = CGF.CGM.getIntrinsic(llvm::Intrinsic::uadd_with_overflow, Types, 1); |
| 622 | llvm::Value *AddRes |
| 623 | = CGF.Builder.CreateCall2(UAddF, SizeWithoutCookie, CookieSizeV); |
| 624 | |
| 625 | Size = CGF.Builder.CreateExtractValue(AddRes, 0); |
| 626 | |
| 627 | llvm::Value *AddDidOverflow = CGF.Builder.CreateExtractValue(AddRes, 1); |
Eli Friedman | 5536daa | 2011-04-09 19:54:33 +0000 | [diff] [blame] | 628 | DidOverflow = CGF.Builder.CreateOr(DidOverflow, AddDidOverflow); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 629 | } |
| 630 | |
| 631 | Size = CGF.Builder.CreateSelect(DidOverflow, |
| 632 | llvm::ConstantInt::get(SizeTy, -1), |
| 633 | Size); |
Chris Lattner | 806941e | 2010-07-20 21:55:52 +0000 | [diff] [blame] | 634 | } |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 635 | |
| 636 | if (CookieSize.isZero()) |
| 637 | SizeWithoutCookie = Size; |
| 638 | else |
| 639 | assert(SizeWithoutCookie && "didn't set SizeWithoutCookie?"); |
| 640 | |
Chris Lattner | 806941e | 2010-07-20 21:55:52 +0000 | [diff] [blame] | 641 | return Size; |
Anders Carlsson | a4d4c01 | 2009-09-23 16:07:23 +0000 | [diff] [blame] | 642 | } |
| 643 | |
Fariborz Jahanian | ef66872 | 2010-06-25 18:26:07 +0000 | [diff] [blame] | 644 | static void StoreAnyExprIntoOneUnit(CodeGenFunction &CGF, const CXXNewExpr *E, |
| 645 | llvm::Value *NewPtr) { |
Fariborz Jahanian | ef66872 | 2010-06-25 18:26:07 +0000 | [diff] [blame] | 646 | |
| 647 | assert(E->getNumConstructorArgs() == 1 && |
| 648 | "Can only have one argument to initializer of POD type."); |
| 649 | |
| 650 | const Expr *Init = E->getConstructorArg(0); |
| 651 | QualType AllocType = E->getAllocatedType(); |
Daniel Dunbar | 91a16fa | 2010-08-21 02:24:36 +0000 | [diff] [blame] | 652 | |
| 653 | unsigned Alignment = |
| 654 | CGF.getContext().getTypeAlignInChars(AllocType).getQuantity(); |
Fariborz Jahanian | ef66872 | 2010-06-25 18:26:07 +0000 | [diff] [blame] | 655 | if (!CGF.hasAggregateLLVMType(AllocType)) |
| 656 | CGF.EmitStoreOfScalar(CGF.EmitScalarExpr(Init), NewPtr, |
Daniel Dunbar | 91a16fa | 2010-08-21 02:24:36 +0000 | [diff] [blame] | 657 | AllocType.isVolatileQualified(), Alignment, |
| 658 | AllocType); |
Fariborz Jahanian | ef66872 | 2010-06-25 18:26:07 +0000 | [diff] [blame] | 659 | else if (AllocType->isAnyComplexType()) |
| 660 | CGF.EmitComplexExprIntoAddr(Init, NewPtr, |
| 661 | AllocType.isVolatileQualified()); |
John McCall | 558d2ab | 2010-09-15 10:14:12 +0000 | [diff] [blame] | 662 | else { |
| 663 | AggValueSlot Slot |
| 664 | = AggValueSlot::forAddr(NewPtr, AllocType.isVolatileQualified(), true); |
| 665 | CGF.EmitAggExpr(Init, Slot); |
| 666 | } |
Fariborz Jahanian | ef66872 | 2010-06-25 18:26:07 +0000 | [diff] [blame] | 667 | } |
| 668 | |
| 669 | void |
| 670 | CodeGenFunction::EmitNewArrayInitializer(const CXXNewExpr *E, |
| 671 | llvm::Value *NewPtr, |
| 672 | llvm::Value *NumElements) { |
Fariborz Jahanian | 5304c95 | 2010-06-25 20:01:13 +0000 | [diff] [blame] | 673 | // We have a POD type. |
| 674 | if (E->getNumConstructorArgs() == 0) |
| 675 | return; |
| 676 | |
Fariborz Jahanian | ef66872 | 2010-06-25 18:26:07 +0000 | [diff] [blame] | 677 | const llvm::Type *SizeTy = ConvertType(getContext().getSizeType()); |
| 678 | |
| 679 | // Create a temporary for the loop index and initialize it with 0. |
| 680 | llvm::Value *IndexPtr = CreateTempAlloca(SizeTy, "loop.index"); |
| 681 | llvm::Value *Zero = llvm::Constant::getNullValue(SizeTy); |
| 682 | Builder.CreateStore(Zero, IndexPtr); |
| 683 | |
| 684 | // Start the loop with a block that tests the condition. |
| 685 | llvm::BasicBlock *CondBlock = createBasicBlock("for.cond"); |
| 686 | llvm::BasicBlock *AfterFor = createBasicBlock("for.end"); |
| 687 | |
| 688 | EmitBlock(CondBlock); |
| 689 | |
| 690 | llvm::BasicBlock *ForBody = createBasicBlock("for.body"); |
| 691 | |
| 692 | // Generate: if (loop-index < number-of-elements fall to the loop body, |
| 693 | // otherwise, go to the block after the for-loop. |
| 694 | llvm::Value *Counter = Builder.CreateLoad(IndexPtr); |
| 695 | llvm::Value *IsLess = Builder.CreateICmpULT(Counter, NumElements, "isless"); |
| 696 | // If the condition is true, execute the body. |
| 697 | Builder.CreateCondBr(IsLess, ForBody, AfterFor); |
| 698 | |
| 699 | EmitBlock(ForBody); |
| 700 | |
| 701 | llvm::BasicBlock *ContinueBlock = createBasicBlock("for.inc"); |
| 702 | // Inside the loop body, emit the constructor call on the array element. |
| 703 | Counter = Builder.CreateLoad(IndexPtr); |
| 704 | llvm::Value *Address = Builder.CreateInBoundsGEP(NewPtr, Counter, |
| 705 | "arrayidx"); |
| 706 | StoreAnyExprIntoOneUnit(*this, E, Address); |
| 707 | |
| 708 | EmitBlock(ContinueBlock); |
| 709 | |
| 710 | // Emit the increment of the loop counter. |
| 711 | llvm::Value *NextVal = llvm::ConstantInt::get(SizeTy, 1); |
| 712 | Counter = Builder.CreateLoad(IndexPtr); |
| 713 | NextVal = Builder.CreateAdd(Counter, NextVal, "inc"); |
| 714 | Builder.CreateStore(NextVal, IndexPtr); |
| 715 | |
| 716 | // Finally, branch back up to the condition for the next iteration. |
| 717 | EmitBranch(CondBlock); |
| 718 | |
| 719 | // Emit the fall-through block. |
| 720 | EmitBlock(AfterFor, true); |
| 721 | } |
| 722 | |
Douglas Gregor | 59174c0 | 2010-07-21 01:10:17 +0000 | [diff] [blame] | 723 | static void EmitZeroMemSet(CodeGenFunction &CGF, QualType T, |
| 724 | llvm::Value *NewPtr, llvm::Value *Size) { |
John McCall | d16c2cf | 2011-02-08 08:22:06 +0000 | [diff] [blame] | 725 | CGF.EmitCastToVoidPtr(NewPtr); |
Ken Dyck | fe71008 | 2011-01-19 01:58:38 +0000 | [diff] [blame] | 726 | CharUnits Alignment = CGF.getContext().getTypeAlignInChars(T); |
Benjamin Kramer | 9f0c7cc | 2010-12-30 00:13:21 +0000 | [diff] [blame] | 727 | CGF.Builder.CreateMemSet(NewPtr, CGF.Builder.getInt8(0), Size, |
Ken Dyck | fe71008 | 2011-01-19 01:58:38 +0000 | [diff] [blame] | 728 | Alignment.getQuantity(), false); |
Douglas Gregor | 59174c0 | 2010-07-21 01:10:17 +0000 | [diff] [blame] | 729 | } |
| 730 | |
Anders Carlsson | a4d4c01 | 2009-09-23 16:07:23 +0000 | [diff] [blame] | 731 | static void EmitNewInitializer(CodeGenFunction &CGF, const CXXNewExpr *E, |
| 732 | llvm::Value *NewPtr, |
Douglas Gregor | 59174c0 | 2010-07-21 01:10:17 +0000 | [diff] [blame] | 733 | llvm::Value *NumElements, |
| 734 | llvm::Value *AllocSizeWithoutCookie) { |
Anders Carlsson | 5d4d946 | 2009-11-24 18:43:52 +0000 | [diff] [blame] | 735 | if (E->isArray()) { |
Anders Carlsson | e99bdb6 | 2010-05-03 15:09:17 +0000 | [diff] [blame] | 736 | if (CXXConstructorDecl *Ctor = E->getConstructor()) { |
Douglas Gregor | 59174c0 | 2010-07-21 01:10:17 +0000 | [diff] [blame] | 737 | bool RequiresZeroInitialization = false; |
| 738 | if (Ctor->getParent()->hasTrivialConstructor()) { |
| 739 | // If new expression did not specify value-initialization, then there |
| 740 | // is no initialization. |
| 741 | if (!E->hasInitializer() || Ctor->getParent()->isEmpty()) |
| 742 | return; |
| 743 | |
John McCall | f16aa10 | 2010-08-22 21:01:12 +0000 | [diff] [blame] | 744 | if (CGF.CGM.getTypes().isZeroInitializable(E->getAllocatedType())) { |
Douglas Gregor | 59174c0 | 2010-07-21 01:10:17 +0000 | [diff] [blame] | 745 | // Optimization: since zero initialization will just set the memory |
| 746 | // to all zeroes, generate a single memset to do it in one shot. |
| 747 | EmitZeroMemSet(CGF, E->getAllocatedType(), NewPtr, |
| 748 | AllocSizeWithoutCookie); |
| 749 | return; |
| 750 | } |
| 751 | |
| 752 | RequiresZeroInitialization = true; |
| 753 | } |
| 754 | |
| 755 | CGF.EmitCXXAggrConstructorCall(Ctor, NumElements, NewPtr, |
| 756 | E->constructor_arg_begin(), |
| 757 | E->constructor_arg_end(), |
| 758 | RequiresZeroInitialization); |
Anders Carlsson | e99bdb6 | 2010-05-03 15:09:17 +0000 | [diff] [blame] | 759 | return; |
Douglas Gregor | 59174c0 | 2010-07-21 01:10:17 +0000 | [diff] [blame] | 760 | } else if (E->getNumConstructorArgs() == 1 && |
| 761 | isa<ImplicitValueInitExpr>(E->getConstructorArg(0))) { |
| 762 | // Optimization: since zero initialization will just set the memory |
| 763 | // to all zeroes, generate a single memset to do it in one shot. |
| 764 | EmitZeroMemSet(CGF, E->getAllocatedType(), NewPtr, |
| 765 | AllocSizeWithoutCookie); |
| 766 | return; |
| 767 | } else { |
Fariborz Jahanian | ef66872 | 2010-06-25 18:26:07 +0000 | [diff] [blame] | 768 | CGF.EmitNewArrayInitializer(E, NewPtr, NumElements); |
| 769 | return; |
| 770 | } |
Anders Carlsson | a4d4c01 | 2009-09-23 16:07:23 +0000 | [diff] [blame] | 771 | } |
Anders Carlsson | 5d4d946 | 2009-11-24 18:43:52 +0000 | [diff] [blame] | 772 | |
| 773 | if (CXXConstructorDecl *Ctor = E->getConstructor()) { |
Douglas Gregor | ed8abf1 | 2010-07-08 06:14:04 +0000 | [diff] [blame] | 774 | // Per C++ [expr.new]p15, if we have an initializer, then we're performing |
| 775 | // direct initialization. C++ [dcl.init]p5 requires that we |
| 776 | // zero-initialize storage if there are no user-declared constructors. |
| 777 | if (E->hasInitializer() && |
| 778 | !Ctor->getParent()->hasUserDeclaredConstructor() && |
| 779 | !Ctor->getParent()->isEmpty()) |
| 780 | CGF.EmitNullInitialization(NewPtr, E->getAllocatedType()); |
| 781 | |
Douglas Gregor | 8474567 | 2010-07-07 23:37:33 +0000 | [diff] [blame] | 782 | CGF.EmitCXXConstructorCall(Ctor, Ctor_Complete, /*ForVirtualBase=*/false, |
| 783 | NewPtr, E->constructor_arg_begin(), |
| 784 | E->constructor_arg_end()); |
Anders Carlsson | 5d4d946 | 2009-11-24 18:43:52 +0000 | [diff] [blame] | 785 | |
| 786 | return; |
| 787 | } |
Fariborz Jahanian | 5304c95 | 2010-06-25 20:01:13 +0000 | [diff] [blame] | 788 | // We have a POD type. |
| 789 | if (E->getNumConstructorArgs() == 0) |
| 790 | return; |
| 791 | |
Fariborz Jahanian | ef66872 | 2010-06-25 18:26:07 +0000 | [diff] [blame] | 792 | StoreAnyExprIntoOneUnit(CGF, E, NewPtr); |
Anders Carlsson | a4d4c01 | 2009-09-23 16:07:23 +0000 | [diff] [blame] | 793 | } |
| 794 | |
John McCall | 7d8647f | 2010-09-14 07:57:04 +0000 | [diff] [blame] | 795 | namespace { |
| 796 | /// A cleanup to call the given 'operator delete' function upon |
| 797 | /// abnormal exit from a new expression. |
| 798 | class CallDeleteDuringNew : public EHScopeStack::Cleanup { |
| 799 | size_t NumPlacementArgs; |
| 800 | const FunctionDecl *OperatorDelete; |
| 801 | llvm::Value *Ptr; |
| 802 | llvm::Value *AllocSize; |
| 803 | |
| 804 | RValue *getPlacementArgs() { return reinterpret_cast<RValue*>(this+1); } |
| 805 | |
| 806 | public: |
| 807 | static size_t getExtraSize(size_t NumPlacementArgs) { |
| 808 | return NumPlacementArgs * sizeof(RValue); |
| 809 | } |
| 810 | |
| 811 | CallDeleteDuringNew(size_t NumPlacementArgs, |
| 812 | const FunctionDecl *OperatorDelete, |
| 813 | llvm::Value *Ptr, |
| 814 | llvm::Value *AllocSize) |
| 815 | : NumPlacementArgs(NumPlacementArgs), OperatorDelete(OperatorDelete), |
| 816 | Ptr(Ptr), AllocSize(AllocSize) {} |
| 817 | |
| 818 | void setPlacementArg(unsigned I, RValue Arg) { |
| 819 | assert(I < NumPlacementArgs && "index out of range"); |
| 820 | getPlacementArgs()[I] = Arg; |
| 821 | } |
| 822 | |
| 823 | void Emit(CodeGenFunction &CGF, bool IsForEH) { |
| 824 | const FunctionProtoType *FPT |
| 825 | = OperatorDelete->getType()->getAs<FunctionProtoType>(); |
| 826 | assert(FPT->getNumArgs() == NumPlacementArgs + 1 || |
John McCall | c384636 | 2010-09-14 21:45:42 +0000 | [diff] [blame] | 827 | (FPT->getNumArgs() == 2 && NumPlacementArgs == 0)); |
John McCall | 7d8647f | 2010-09-14 07:57:04 +0000 | [diff] [blame] | 828 | |
| 829 | CallArgList DeleteArgs; |
| 830 | |
| 831 | // The first argument is always a void*. |
| 832 | FunctionProtoType::arg_type_iterator AI = FPT->arg_type_begin(); |
| 833 | DeleteArgs.push_back(std::make_pair(RValue::get(Ptr), *AI++)); |
| 834 | |
| 835 | // A member 'operator delete' can take an extra 'size_t' argument. |
| 836 | if (FPT->getNumArgs() == NumPlacementArgs + 2) |
| 837 | DeleteArgs.push_back(std::make_pair(RValue::get(AllocSize), *AI++)); |
| 838 | |
| 839 | // Pass the rest of the arguments, which must match exactly. |
| 840 | for (unsigned I = 0; I != NumPlacementArgs; ++I) |
| 841 | DeleteArgs.push_back(std::make_pair(getPlacementArgs()[I], *AI++)); |
| 842 | |
| 843 | // Call 'operator delete'. |
Tilmann Scheller | 9c6082f | 2011-03-02 21:36:49 +0000 | [diff] [blame] | 844 | CGF.EmitCall(CGF.CGM.getTypes().getFunctionInfo(DeleteArgs, FPT), |
John McCall | 7d8647f | 2010-09-14 07:57:04 +0000 | [diff] [blame] | 845 | CGF.CGM.GetAddrOfFunction(OperatorDelete), |
| 846 | ReturnValueSlot(), DeleteArgs, OperatorDelete); |
| 847 | } |
| 848 | }; |
John McCall | 3019c44 | 2010-09-17 00:50:28 +0000 | [diff] [blame] | 849 | |
| 850 | /// A cleanup to call the given 'operator delete' function upon |
| 851 | /// abnormal exit from a new expression when the new expression is |
| 852 | /// conditional. |
| 853 | class CallDeleteDuringConditionalNew : public EHScopeStack::Cleanup { |
| 854 | size_t NumPlacementArgs; |
| 855 | const FunctionDecl *OperatorDelete; |
John McCall | 804b807 | 2011-01-28 10:53:53 +0000 | [diff] [blame] | 856 | DominatingValue<RValue>::saved_type Ptr; |
| 857 | DominatingValue<RValue>::saved_type AllocSize; |
John McCall | 3019c44 | 2010-09-17 00:50:28 +0000 | [diff] [blame] | 858 | |
John McCall | 804b807 | 2011-01-28 10:53:53 +0000 | [diff] [blame] | 859 | DominatingValue<RValue>::saved_type *getPlacementArgs() { |
| 860 | return reinterpret_cast<DominatingValue<RValue>::saved_type*>(this+1); |
John McCall | 3019c44 | 2010-09-17 00:50:28 +0000 | [diff] [blame] | 861 | } |
| 862 | |
| 863 | public: |
| 864 | static size_t getExtraSize(size_t NumPlacementArgs) { |
John McCall | 804b807 | 2011-01-28 10:53:53 +0000 | [diff] [blame] | 865 | return NumPlacementArgs * sizeof(DominatingValue<RValue>::saved_type); |
John McCall | 3019c44 | 2010-09-17 00:50:28 +0000 | [diff] [blame] | 866 | } |
| 867 | |
| 868 | CallDeleteDuringConditionalNew(size_t NumPlacementArgs, |
| 869 | const FunctionDecl *OperatorDelete, |
John McCall | 804b807 | 2011-01-28 10:53:53 +0000 | [diff] [blame] | 870 | DominatingValue<RValue>::saved_type Ptr, |
| 871 | DominatingValue<RValue>::saved_type AllocSize) |
John McCall | 3019c44 | 2010-09-17 00:50:28 +0000 | [diff] [blame] | 872 | : NumPlacementArgs(NumPlacementArgs), OperatorDelete(OperatorDelete), |
| 873 | Ptr(Ptr), AllocSize(AllocSize) {} |
| 874 | |
John McCall | 804b807 | 2011-01-28 10:53:53 +0000 | [diff] [blame] | 875 | void setPlacementArg(unsigned I, DominatingValue<RValue>::saved_type Arg) { |
John McCall | 3019c44 | 2010-09-17 00:50:28 +0000 | [diff] [blame] | 876 | assert(I < NumPlacementArgs && "index out of range"); |
| 877 | getPlacementArgs()[I] = Arg; |
| 878 | } |
| 879 | |
| 880 | void Emit(CodeGenFunction &CGF, bool IsForEH) { |
| 881 | const FunctionProtoType *FPT |
| 882 | = OperatorDelete->getType()->getAs<FunctionProtoType>(); |
| 883 | assert(FPT->getNumArgs() == NumPlacementArgs + 1 || |
| 884 | (FPT->getNumArgs() == 2 && NumPlacementArgs == 0)); |
| 885 | |
| 886 | CallArgList DeleteArgs; |
| 887 | |
| 888 | // The first argument is always a void*. |
| 889 | FunctionProtoType::arg_type_iterator AI = FPT->arg_type_begin(); |
John McCall | 804b807 | 2011-01-28 10:53:53 +0000 | [diff] [blame] | 890 | DeleteArgs.push_back(std::make_pair(Ptr.restore(CGF), *AI++)); |
John McCall | 3019c44 | 2010-09-17 00:50:28 +0000 | [diff] [blame] | 891 | |
| 892 | // A member 'operator delete' can take an extra 'size_t' argument. |
| 893 | if (FPT->getNumArgs() == NumPlacementArgs + 2) { |
John McCall | 804b807 | 2011-01-28 10:53:53 +0000 | [diff] [blame] | 894 | RValue RV = AllocSize.restore(CGF); |
John McCall | 3019c44 | 2010-09-17 00:50:28 +0000 | [diff] [blame] | 895 | DeleteArgs.push_back(std::make_pair(RV, *AI++)); |
| 896 | } |
| 897 | |
| 898 | // Pass the rest of the arguments, which must match exactly. |
| 899 | for (unsigned I = 0; I != NumPlacementArgs; ++I) { |
John McCall | 804b807 | 2011-01-28 10:53:53 +0000 | [diff] [blame] | 900 | RValue RV = getPlacementArgs()[I].restore(CGF); |
John McCall | 3019c44 | 2010-09-17 00:50:28 +0000 | [diff] [blame] | 901 | DeleteArgs.push_back(std::make_pair(RV, *AI++)); |
| 902 | } |
| 903 | |
| 904 | // Call 'operator delete'. |
Tilmann Scheller | 9c6082f | 2011-03-02 21:36:49 +0000 | [diff] [blame] | 905 | CGF.EmitCall(CGF.CGM.getTypes().getFunctionInfo(DeleteArgs, FPT), |
John McCall | 3019c44 | 2010-09-17 00:50:28 +0000 | [diff] [blame] | 906 | CGF.CGM.GetAddrOfFunction(OperatorDelete), |
| 907 | ReturnValueSlot(), DeleteArgs, OperatorDelete); |
| 908 | } |
| 909 | }; |
| 910 | } |
| 911 | |
| 912 | /// Enter a cleanup to call 'operator delete' if the initializer in a |
| 913 | /// new-expression throws. |
| 914 | static void EnterNewDeleteCleanup(CodeGenFunction &CGF, |
| 915 | const CXXNewExpr *E, |
| 916 | llvm::Value *NewPtr, |
| 917 | llvm::Value *AllocSize, |
| 918 | const CallArgList &NewArgs) { |
| 919 | // If we're not inside a conditional branch, then the cleanup will |
| 920 | // dominate and we can do the easier (and more efficient) thing. |
| 921 | if (!CGF.isInConditionalBranch()) { |
| 922 | CallDeleteDuringNew *Cleanup = CGF.EHStack |
| 923 | .pushCleanupWithExtra<CallDeleteDuringNew>(EHCleanup, |
| 924 | E->getNumPlacementArgs(), |
| 925 | E->getOperatorDelete(), |
| 926 | NewPtr, AllocSize); |
| 927 | for (unsigned I = 0, N = E->getNumPlacementArgs(); I != N; ++I) |
| 928 | Cleanup->setPlacementArg(I, NewArgs[I+1].first); |
| 929 | |
| 930 | return; |
| 931 | } |
| 932 | |
| 933 | // Otherwise, we need to save all this stuff. |
John McCall | 804b807 | 2011-01-28 10:53:53 +0000 | [diff] [blame] | 934 | DominatingValue<RValue>::saved_type SavedNewPtr = |
| 935 | DominatingValue<RValue>::save(CGF, RValue::get(NewPtr)); |
| 936 | DominatingValue<RValue>::saved_type SavedAllocSize = |
| 937 | DominatingValue<RValue>::save(CGF, RValue::get(AllocSize)); |
John McCall | 3019c44 | 2010-09-17 00:50:28 +0000 | [diff] [blame] | 938 | |
| 939 | CallDeleteDuringConditionalNew *Cleanup = CGF.EHStack |
| 940 | .pushCleanupWithExtra<CallDeleteDuringConditionalNew>(InactiveEHCleanup, |
| 941 | E->getNumPlacementArgs(), |
| 942 | E->getOperatorDelete(), |
| 943 | SavedNewPtr, |
| 944 | SavedAllocSize); |
| 945 | for (unsigned I = 0, N = E->getNumPlacementArgs(); I != N; ++I) |
John McCall | 804b807 | 2011-01-28 10:53:53 +0000 | [diff] [blame] | 946 | Cleanup->setPlacementArg(I, |
| 947 | DominatingValue<RValue>::save(CGF, NewArgs[I+1].first)); |
John McCall | 3019c44 | 2010-09-17 00:50:28 +0000 | [diff] [blame] | 948 | |
| 949 | CGF.ActivateCleanupBlock(CGF.EHStack.stable_begin()); |
John McCall | 7d8647f | 2010-09-14 07:57:04 +0000 | [diff] [blame] | 950 | } |
| 951 | |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 952 | llvm::Value *CodeGenFunction::EmitCXXNewExpr(const CXXNewExpr *E) { |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 953 | // The element type being allocated. |
| 954 | QualType allocType = getContext().getBaseElementType(E->getAllocatedType()); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 955 | |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 956 | // 1. Build a call to the allocation function. |
| 957 | FunctionDecl *allocator = E->getOperatorNew(); |
| 958 | const FunctionProtoType *allocatorType = |
| 959 | allocator->getType()->castAs<FunctionProtoType>(); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 960 | |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 961 | CallArgList allocatorArgs; |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 962 | |
| 963 | // The allocation size is the first argument. |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 964 | QualType sizeType = getContext().getSizeType(); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 965 | |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 966 | llvm::Value *numElements = 0; |
| 967 | llvm::Value *allocSizeWithoutCookie = 0; |
| 968 | llvm::Value *allocSize = |
| 969 | EmitCXXNewAllocSize(getContext(), *this, E, numElements, |
| 970 | allocSizeWithoutCookie); |
Anders Carlsson | a4d4c01 | 2009-09-23 16:07:23 +0000 | [diff] [blame] | 971 | |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 972 | allocatorArgs.push_back(std::make_pair(RValue::get(allocSize), sizeType)); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 973 | |
| 974 | // Emit the rest of the arguments. |
| 975 | // FIXME: Ideally, this should just use EmitCallArgs. |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 976 | CXXNewExpr::const_arg_iterator placementArg = E->placement_arg_begin(); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 977 | |
| 978 | // First, use the types from the function type. |
| 979 | // We start at 1 here because the first argument (the allocation size) |
| 980 | // has already been emitted. |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 981 | for (unsigned i = 1, e = allocatorType->getNumArgs(); i != e; |
| 982 | ++i, ++placementArg) { |
| 983 | QualType argType = allocatorType->getArgType(i); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 984 | |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 985 | assert(getContext().hasSameUnqualifiedType(argType.getNonReferenceType(), |
| 986 | placementArg->getType()) && |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 987 | "type mismatch in call argument!"); |
| 988 | |
John McCall | 413ebdb | 2011-03-11 20:59:21 +0000 | [diff] [blame] | 989 | EmitCallArg(allocatorArgs, *placementArg, argType); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 990 | } |
| 991 | |
| 992 | // Either we've emitted all the call args, or we have a call to a |
| 993 | // variadic function. |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 994 | assert((placementArg == E->placement_arg_end() || |
| 995 | allocatorType->isVariadic()) && |
| 996 | "Extra arguments to non-variadic function!"); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 997 | |
| 998 | // If we still have any arguments, emit them using the type of the argument. |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 999 | for (CXXNewExpr::const_arg_iterator placementArgsEnd = E->placement_arg_end(); |
| 1000 | placementArg != placementArgsEnd; ++placementArg) { |
John McCall | 413ebdb | 2011-03-11 20:59:21 +0000 | [diff] [blame] | 1001 | EmitCallArg(allocatorArgs, *placementArg, placementArg->getType()); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 1002 | } |
| 1003 | |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 1004 | // Emit the allocation call. |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 1005 | RValue RV = |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 1006 | EmitCall(CGM.getTypes().getFunctionInfo(allocatorArgs, allocatorType), |
| 1007 | CGM.GetAddrOfFunction(allocator), ReturnValueSlot(), |
| 1008 | allocatorArgs, allocator); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 1009 | |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 1010 | // Emit a null check on the allocation result if the allocation |
| 1011 | // function is allowed to return null (because it has a non-throwing |
| 1012 | // exception spec; for this part, we inline |
| 1013 | // CXXNewExpr::shouldNullCheckAllocation()) and we have an |
| 1014 | // interesting initializer. |
Sebastian Redl | 8026f6d | 2011-03-13 17:09:40 +0000 | [diff] [blame] | 1015 | bool nullCheck = allocatorType->isNothrow(getContext()) && |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 1016 | !(allocType->isPODType() && !E->hasInitializer()); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 1017 | |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 1018 | llvm::BasicBlock *nullCheckBB = 0; |
| 1019 | llvm::BasicBlock *contBB = 0; |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 1020 | |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 1021 | llvm::Value *allocation = RV.getScalarVal(); |
| 1022 | unsigned AS = |
| 1023 | cast<llvm::PointerType>(allocation->getType())->getAddressSpace(); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 1024 | |
John McCall | a7f633f | 2011-03-07 01:52:56 +0000 | [diff] [blame] | 1025 | // The null-check means that the initializer is conditionally |
| 1026 | // evaluated. |
| 1027 | ConditionalEvaluation conditional(*this); |
| 1028 | |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 1029 | if (nullCheck) { |
John McCall | a7f633f | 2011-03-07 01:52:56 +0000 | [diff] [blame] | 1030 | conditional.begin(*this); |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 1031 | |
| 1032 | nullCheckBB = Builder.GetInsertBlock(); |
| 1033 | llvm::BasicBlock *notNullBB = createBasicBlock("new.notnull"); |
| 1034 | contBB = createBasicBlock("new.cont"); |
| 1035 | |
| 1036 | llvm::Value *isNull = Builder.CreateIsNull(allocation, "new.isnull"); |
| 1037 | Builder.CreateCondBr(isNull, contBB, notNullBB); |
| 1038 | EmitBlock(notNullBB); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 1039 | } |
Ken Dyck | caf647c | 2010-01-26 19:44:24 +0000 | [diff] [blame] | 1040 | |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 1041 | assert((allocSize == allocSizeWithoutCookie) == |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 1042 | CalculateCookiePadding(*this, E).isZero()); |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 1043 | if (allocSize != allocSizeWithoutCookie) { |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 1044 | assert(E->isArray()); |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 1045 | allocation = CGM.getCXXABI().InitializeArrayCookie(*this, allocation, |
| 1046 | numElements, |
| 1047 | E, allocType); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 1048 | } |
Anders Carlsson | 6ac5fc4 | 2009-09-23 18:59:48 +0000 | [diff] [blame] | 1049 | |
John McCall | 7d8647f | 2010-09-14 07:57:04 +0000 | [diff] [blame] | 1050 | // If there's an operator delete, enter a cleanup to call it if an |
| 1051 | // exception is thrown. |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 1052 | EHScopeStack::stable_iterator operatorDeleteCleanup; |
John McCall | 7d8647f | 2010-09-14 07:57:04 +0000 | [diff] [blame] | 1053 | if (E->getOperatorDelete()) { |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 1054 | EnterNewDeleteCleanup(*this, E, allocation, allocSize, allocatorArgs); |
| 1055 | operatorDeleteCleanup = EHStack.stable_begin(); |
John McCall | 7d8647f | 2010-09-14 07:57:04 +0000 | [diff] [blame] | 1056 | } |
| 1057 | |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 1058 | const llvm::Type *elementPtrTy |
| 1059 | = ConvertTypeForMem(allocType)->getPointerTo(AS); |
| 1060 | llvm::Value *result = Builder.CreateBitCast(allocation, elementPtrTy); |
John McCall | 7d8647f | 2010-09-14 07:57:04 +0000 | [diff] [blame] | 1061 | |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 1062 | if (E->isArray()) { |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 1063 | EmitNewInitializer(*this, E, result, numElements, allocSizeWithoutCookie); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 1064 | |
| 1065 | // NewPtr is a pointer to the base element type. If we're |
| 1066 | // allocating an array of arrays, we'll need to cast back to the |
| 1067 | // array pointer type. |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 1068 | const llvm::Type *resultType = ConvertTypeForMem(E->getType()); |
| 1069 | if (result->getType() != resultType) |
| 1070 | result = Builder.CreateBitCast(result, resultType); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 1071 | } else { |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 1072 | EmitNewInitializer(*this, E, result, numElements, allocSizeWithoutCookie); |
Fariborz Jahanian | ceb43b6 | 2010-03-24 16:57:01 +0000 | [diff] [blame] | 1073 | } |
John McCall | 7d8647f | 2010-09-14 07:57:04 +0000 | [diff] [blame] | 1074 | |
| 1075 | // Deactivate the 'operator delete' cleanup if we finished |
| 1076 | // initialization. |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 1077 | if (operatorDeleteCleanup.isValid()) |
| 1078 | DeactivateCleanupBlock(operatorDeleteCleanup); |
Fariborz Jahanian | ceb43b6 | 2010-03-24 16:57:01 +0000 | [diff] [blame] | 1079 | |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 1080 | if (nullCheck) { |
John McCall | a7f633f | 2011-03-07 01:52:56 +0000 | [diff] [blame] | 1081 | conditional.end(*this); |
| 1082 | |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 1083 | llvm::BasicBlock *notNullBB = Builder.GetInsertBlock(); |
| 1084 | EmitBlock(contBB); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 1085 | |
Jay Foad | bbf3bac | 2011-03-30 11:28:58 +0000 | [diff] [blame] | 1086 | llvm::PHINode *PHI = Builder.CreatePHI(result->getType(), 2); |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 1087 | PHI->addIncoming(result, notNullBB); |
| 1088 | PHI->addIncoming(llvm::Constant::getNullValue(result->getType()), |
| 1089 | nullCheckBB); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 1090 | |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 1091 | result = PHI; |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 1092 | } |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 1093 | |
John McCall | c2f3e7f | 2011-03-07 03:12:35 +0000 | [diff] [blame] | 1094 | return result; |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 1095 | } |
| 1096 | |
Eli Friedman | 5fe0598 | 2009-11-18 00:50:08 +0000 | [diff] [blame] | 1097 | void CodeGenFunction::EmitDeleteCall(const FunctionDecl *DeleteFD, |
| 1098 | llvm::Value *Ptr, |
| 1099 | QualType DeleteTy) { |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 1100 | assert(DeleteFD->getOverloadedOperator() == OO_Delete); |
| 1101 | |
Eli Friedman | 5fe0598 | 2009-11-18 00:50:08 +0000 | [diff] [blame] | 1102 | const FunctionProtoType *DeleteFTy = |
| 1103 | DeleteFD->getType()->getAs<FunctionProtoType>(); |
| 1104 | |
| 1105 | CallArgList DeleteArgs; |
| 1106 | |
Anders Carlsson | 871d078 | 2009-12-13 20:04:38 +0000 | [diff] [blame] | 1107 | // Check if we need to pass the size to the delete operator. |
| 1108 | llvm::Value *Size = 0; |
| 1109 | QualType SizeTy; |
| 1110 | if (DeleteFTy->getNumArgs() == 2) { |
| 1111 | SizeTy = DeleteFTy->getArgType(1); |
Ken Dyck | 4f122ef | 2010-01-26 19:59:28 +0000 | [diff] [blame] | 1112 | CharUnits DeleteTypeSize = getContext().getTypeSizeInChars(DeleteTy); |
| 1113 | Size = llvm::ConstantInt::get(ConvertType(SizeTy), |
| 1114 | DeleteTypeSize.getQuantity()); |
Anders Carlsson | 871d078 | 2009-12-13 20:04:38 +0000 | [diff] [blame] | 1115 | } |
| 1116 | |
Eli Friedman | 5fe0598 | 2009-11-18 00:50:08 +0000 | [diff] [blame] | 1117 | QualType ArgTy = DeleteFTy->getArgType(0); |
| 1118 | llvm::Value *DeletePtr = Builder.CreateBitCast(Ptr, ConvertType(ArgTy)); |
| 1119 | DeleteArgs.push_back(std::make_pair(RValue::get(DeletePtr), ArgTy)); |
| 1120 | |
Anders Carlsson | 871d078 | 2009-12-13 20:04:38 +0000 | [diff] [blame] | 1121 | if (Size) |
Eli Friedman | 5fe0598 | 2009-11-18 00:50:08 +0000 | [diff] [blame] | 1122 | DeleteArgs.push_back(std::make_pair(RValue::get(Size), SizeTy)); |
Eli Friedman | 5fe0598 | 2009-11-18 00:50:08 +0000 | [diff] [blame] | 1123 | |
| 1124 | // Emit the call to delete. |
Tilmann Scheller | 9c6082f | 2011-03-02 21:36:49 +0000 | [diff] [blame] | 1125 | EmitCall(CGM.getTypes().getFunctionInfo(DeleteArgs, DeleteFTy), |
Anders Carlsson | f3c47c9 | 2009-12-24 19:25:24 +0000 | [diff] [blame] | 1126 | CGM.GetAddrOfFunction(DeleteFD), ReturnValueSlot(), |
Eli Friedman | 5fe0598 | 2009-11-18 00:50:08 +0000 | [diff] [blame] | 1127 | DeleteArgs, DeleteFD); |
| 1128 | } |
| 1129 | |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 1130 | namespace { |
| 1131 | /// Calls the given 'operator delete' on a single object. |
| 1132 | struct CallObjectDelete : EHScopeStack::Cleanup { |
| 1133 | llvm::Value *Ptr; |
| 1134 | const FunctionDecl *OperatorDelete; |
| 1135 | QualType ElementType; |
| 1136 | |
| 1137 | CallObjectDelete(llvm::Value *Ptr, |
| 1138 | const FunctionDecl *OperatorDelete, |
| 1139 | QualType ElementType) |
| 1140 | : Ptr(Ptr), OperatorDelete(OperatorDelete), ElementType(ElementType) {} |
| 1141 | |
| 1142 | void Emit(CodeGenFunction &CGF, bool IsForEH) { |
| 1143 | CGF.EmitDeleteCall(OperatorDelete, Ptr, ElementType); |
| 1144 | } |
| 1145 | }; |
| 1146 | } |
| 1147 | |
| 1148 | /// Emit the code for deleting a single object. |
| 1149 | static void EmitObjectDelete(CodeGenFunction &CGF, |
| 1150 | const FunctionDecl *OperatorDelete, |
| 1151 | llvm::Value *Ptr, |
| 1152 | QualType ElementType) { |
| 1153 | // Find the destructor for the type, if applicable. If the |
| 1154 | // destructor is virtual, we'll just emit the vcall and return. |
| 1155 | const CXXDestructorDecl *Dtor = 0; |
| 1156 | if (const RecordType *RT = ElementType->getAs<RecordType>()) { |
| 1157 | CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); |
| 1158 | if (!RD->hasTrivialDestructor()) { |
| 1159 | Dtor = RD->getDestructor(); |
| 1160 | |
| 1161 | if (Dtor->isVirtual()) { |
| 1162 | const llvm::Type *Ty = |
John McCall | fc40028 | 2010-09-03 01:26:39 +0000 | [diff] [blame] | 1163 | CGF.getTypes().GetFunctionType(CGF.getTypes().getFunctionInfo(Dtor, |
| 1164 | Dtor_Complete), |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 1165 | /*isVariadic=*/false); |
| 1166 | |
| 1167 | llvm::Value *Callee |
| 1168 | = CGF.BuildVirtualCall(Dtor, Dtor_Deleting, Ptr, Ty); |
| 1169 | CGF.EmitCXXMemberCall(Dtor, Callee, ReturnValueSlot(), Ptr, /*VTT=*/0, |
| 1170 | 0, 0); |
| 1171 | |
| 1172 | // The dtor took care of deleting the object. |
| 1173 | return; |
| 1174 | } |
| 1175 | } |
| 1176 | } |
| 1177 | |
| 1178 | // Make sure that we call delete even if the dtor throws. |
John McCall | 3ad32c8 | 2011-01-28 08:37:24 +0000 | [diff] [blame] | 1179 | // This doesn't have to a conditional cleanup because we're going |
| 1180 | // to pop it off in a second. |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 1181 | CGF.EHStack.pushCleanup<CallObjectDelete>(NormalAndEHCleanup, |
| 1182 | Ptr, OperatorDelete, ElementType); |
| 1183 | |
| 1184 | if (Dtor) |
| 1185 | CGF.EmitCXXDestructorCall(Dtor, Dtor_Complete, |
| 1186 | /*ForVirtualBase=*/false, Ptr); |
| 1187 | |
| 1188 | CGF.PopCleanupBlock(); |
| 1189 | } |
| 1190 | |
| 1191 | namespace { |
| 1192 | /// Calls the given 'operator delete' on an array of objects. |
| 1193 | struct CallArrayDelete : EHScopeStack::Cleanup { |
| 1194 | llvm::Value *Ptr; |
| 1195 | const FunctionDecl *OperatorDelete; |
| 1196 | llvm::Value *NumElements; |
| 1197 | QualType ElementType; |
| 1198 | CharUnits CookieSize; |
| 1199 | |
| 1200 | CallArrayDelete(llvm::Value *Ptr, |
| 1201 | const FunctionDecl *OperatorDelete, |
| 1202 | llvm::Value *NumElements, |
| 1203 | QualType ElementType, |
| 1204 | CharUnits CookieSize) |
| 1205 | : Ptr(Ptr), OperatorDelete(OperatorDelete), NumElements(NumElements), |
| 1206 | ElementType(ElementType), CookieSize(CookieSize) {} |
| 1207 | |
| 1208 | void Emit(CodeGenFunction &CGF, bool IsForEH) { |
| 1209 | const FunctionProtoType *DeleteFTy = |
| 1210 | OperatorDelete->getType()->getAs<FunctionProtoType>(); |
| 1211 | assert(DeleteFTy->getNumArgs() == 1 || DeleteFTy->getNumArgs() == 2); |
| 1212 | |
| 1213 | CallArgList Args; |
| 1214 | |
| 1215 | // Pass the pointer as the first argument. |
| 1216 | QualType VoidPtrTy = DeleteFTy->getArgType(0); |
| 1217 | llvm::Value *DeletePtr |
| 1218 | = CGF.Builder.CreateBitCast(Ptr, CGF.ConvertType(VoidPtrTy)); |
| 1219 | Args.push_back(std::make_pair(RValue::get(DeletePtr), VoidPtrTy)); |
| 1220 | |
| 1221 | // Pass the original requested size as the second argument. |
| 1222 | if (DeleteFTy->getNumArgs() == 2) { |
| 1223 | QualType size_t = DeleteFTy->getArgType(1); |
| 1224 | const llvm::IntegerType *SizeTy |
| 1225 | = cast<llvm::IntegerType>(CGF.ConvertType(size_t)); |
| 1226 | |
| 1227 | CharUnits ElementTypeSize = |
| 1228 | CGF.CGM.getContext().getTypeSizeInChars(ElementType); |
| 1229 | |
| 1230 | // The size of an element, multiplied by the number of elements. |
| 1231 | llvm::Value *Size |
| 1232 | = llvm::ConstantInt::get(SizeTy, ElementTypeSize.getQuantity()); |
| 1233 | Size = CGF.Builder.CreateMul(Size, NumElements); |
| 1234 | |
| 1235 | // Plus the size of the cookie if applicable. |
| 1236 | if (!CookieSize.isZero()) { |
| 1237 | llvm::Value *CookieSizeV |
| 1238 | = llvm::ConstantInt::get(SizeTy, CookieSize.getQuantity()); |
| 1239 | Size = CGF.Builder.CreateAdd(Size, CookieSizeV); |
| 1240 | } |
| 1241 | |
| 1242 | Args.push_back(std::make_pair(RValue::get(Size), size_t)); |
| 1243 | } |
| 1244 | |
| 1245 | // Emit the call to delete. |
Tilmann Scheller | 9c6082f | 2011-03-02 21:36:49 +0000 | [diff] [blame] | 1246 | CGF.EmitCall(CGF.getTypes().getFunctionInfo(Args, DeleteFTy), |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 1247 | CGF.CGM.GetAddrOfFunction(OperatorDelete), |
| 1248 | ReturnValueSlot(), Args, OperatorDelete); |
| 1249 | } |
| 1250 | }; |
| 1251 | } |
| 1252 | |
| 1253 | /// Emit the code for deleting an array of objects. |
| 1254 | static void EmitArrayDelete(CodeGenFunction &CGF, |
John McCall | 6ec278d | 2011-01-27 09:37:56 +0000 | [diff] [blame] | 1255 | const CXXDeleteExpr *E, |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 1256 | llvm::Value *Ptr, |
| 1257 | QualType ElementType) { |
| 1258 | llvm::Value *NumElements = 0; |
| 1259 | llvm::Value *AllocatedPtr = 0; |
| 1260 | CharUnits CookieSize; |
John McCall | 6ec278d | 2011-01-27 09:37:56 +0000 | [diff] [blame] | 1261 | CGF.CGM.getCXXABI().ReadArrayCookie(CGF, Ptr, E, ElementType, |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 1262 | NumElements, AllocatedPtr, CookieSize); |
| 1263 | |
| 1264 | assert(AllocatedPtr && "ReadArrayCookie didn't set AllocatedPtr"); |
| 1265 | |
| 1266 | // Make sure that we call delete even if one of the dtors throws. |
John McCall | 6ec278d | 2011-01-27 09:37:56 +0000 | [diff] [blame] | 1267 | const FunctionDecl *OperatorDelete = E->getOperatorDelete(); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 1268 | CGF.EHStack.pushCleanup<CallArrayDelete>(NormalAndEHCleanup, |
| 1269 | AllocatedPtr, OperatorDelete, |
| 1270 | NumElements, ElementType, |
| 1271 | CookieSize); |
| 1272 | |
| 1273 | if (const CXXRecordDecl *RD = ElementType->getAsCXXRecordDecl()) { |
| 1274 | if (!RD->hasTrivialDestructor()) { |
| 1275 | assert(NumElements && "ReadArrayCookie didn't find element count" |
| 1276 | " for a class with destructor"); |
| 1277 | CGF.EmitCXXAggrDestructorCall(RD->getDestructor(), NumElements, Ptr); |
| 1278 | } |
| 1279 | } |
| 1280 | |
| 1281 | CGF.PopCleanupBlock(); |
| 1282 | } |
| 1283 | |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 1284 | void CodeGenFunction::EmitCXXDeleteExpr(const CXXDeleteExpr *E) { |
Fariborz Jahanian | 72c2153 | 2009-11-13 19:27:47 +0000 | [diff] [blame] | 1285 | |
Douglas Gregor | 9091656 | 2009-09-29 18:16:17 +0000 | [diff] [blame] | 1286 | // Get at the argument before we performed the implicit conversion |
| 1287 | // to void*. |
| 1288 | const Expr *Arg = E->getArgument(); |
| 1289 | while (const ImplicitCastExpr *ICE = dyn_cast<ImplicitCastExpr>(Arg)) { |
John McCall | 2de56d1 | 2010-08-25 11:45:40 +0000 | [diff] [blame] | 1290 | if (ICE->getCastKind() != CK_UserDefinedConversion && |
Douglas Gregor | 9091656 | 2009-09-29 18:16:17 +0000 | [diff] [blame] | 1291 | ICE->getType()->isVoidPointerType()) |
| 1292 | Arg = ICE->getSubExpr(); |
Douglas Gregor | d69dd78 | 2009-10-01 05:49:51 +0000 | [diff] [blame] | 1293 | else |
| 1294 | break; |
Douglas Gregor | 9091656 | 2009-09-29 18:16:17 +0000 | [diff] [blame] | 1295 | } |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 1296 | |
Douglas Gregor | 9091656 | 2009-09-29 18:16:17 +0000 | [diff] [blame] | 1297 | llvm::Value *Ptr = EmitScalarExpr(Arg); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 1298 | |
| 1299 | // Null check the pointer. |
| 1300 | llvm::BasicBlock *DeleteNotNull = createBasicBlock("delete.notnull"); |
| 1301 | llvm::BasicBlock *DeleteEnd = createBasicBlock("delete.end"); |
| 1302 | |
Anders Carlsson | b924124 | 2011-04-11 00:30:07 +0000 | [diff] [blame] | 1303 | llvm::Value *IsNull = Builder.CreateIsNull(Ptr, "isnull"); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 1304 | |
| 1305 | Builder.CreateCondBr(IsNull, DeleteEnd, DeleteNotNull); |
| 1306 | EmitBlock(DeleteNotNull); |
Anders Carlsson | 566abee | 2009-11-13 04:45:41 +0000 | [diff] [blame] | 1307 | |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 1308 | // We might be deleting a pointer to array. If so, GEP down to the |
| 1309 | // first non-array element. |
| 1310 | // (this assumes that A(*)[3][7] is converted to [3 x [7 x %A]]*) |
| 1311 | QualType DeleteTy = Arg->getType()->getAs<PointerType>()->getPointeeType(); |
| 1312 | if (DeleteTy->isConstantArrayType()) { |
| 1313 | llvm::Value *Zero = Builder.getInt32(0); |
| 1314 | llvm::SmallVector<llvm::Value*,8> GEP; |
| 1315 | |
| 1316 | GEP.push_back(Zero); // point at the outermost array |
| 1317 | |
| 1318 | // For each layer of array type we're pointing at: |
| 1319 | while (const ConstantArrayType *Arr |
| 1320 | = getContext().getAsConstantArrayType(DeleteTy)) { |
| 1321 | // 1. Unpeel the array type. |
| 1322 | DeleteTy = Arr->getElementType(); |
| 1323 | |
| 1324 | // 2. GEP to the first element of the array. |
| 1325 | GEP.push_back(Zero); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 1326 | } |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 1327 | |
| 1328 | Ptr = Builder.CreateInBoundsGEP(Ptr, GEP.begin(), GEP.end(), "del.first"); |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 1329 | } |
| 1330 | |
Douglas Gregor | eede61a | 2010-09-02 17:38:50 +0000 | [diff] [blame] | 1331 | assert(ConvertTypeForMem(DeleteTy) == |
| 1332 | cast<llvm::PointerType>(Ptr->getType())->getElementType()); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 1333 | |
| 1334 | if (E->isArrayForm()) { |
John McCall | 6ec278d | 2011-01-27 09:37:56 +0000 | [diff] [blame] | 1335 | EmitArrayDelete(*this, E, Ptr, DeleteTy); |
John McCall | 1e7fe75 | 2010-09-02 09:58:18 +0000 | [diff] [blame] | 1336 | } else { |
| 1337 | EmitObjectDelete(*this, E->getOperatorDelete(), Ptr, DeleteTy); |
| 1338 | } |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 1339 | |
Anders Carlsson | 16d81b8 | 2009-09-22 22:53:17 +0000 | [diff] [blame] | 1340 | EmitBlock(DeleteEnd); |
| 1341 | } |
Mike Stump | c2e84ae | 2009-11-15 08:09:41 +0000 | [diff] [blame] | 1342 | |
Anders Carlsson | 4bdbc0c | 2011-04-11 14:13:40 +0000 | [diff] [blame] | 1343 | static llvm::Constant *getBadTypeidFn(CodeGenFunction &CGF) { |
| 1344 | // void __cxa_bad_typeid(); |
| 1345 | |
| 1346 | const llvm::Type *VoidTy = llvm::Type::getVoidTy(CGF.getLLVMContext()); |
| 1347 | const llvm::FunctionType *FTy = |
| 1348 | llvm::FunctionType::get(VoidTy, false); |
| 1349 | |
| 1350 | return CGF.CGM.CreateRuntimeFunction(FTy, "__cxa_bad_typeid"); |
| 1351 | } |
| 1352 | |
| 1353 | static void EmitBadTypeidCall(CodeGenFunction &CGF) { |
Anders Carlsson | ad3692bb | 2011-04-13 02:35:36 +0000 | [diff] [blame] | 1354 | llvm::Value *Fn = getBadTypeidFn(CGF); |
| 1355 | CGF.EmitCallOrInvoke(Fn, 0, 0).setDoesNotReturn(); |
Anders Carlsson | 4bdbc0c | 2011-04-11 14:13:40 +0000 | [diff] [blame] | 1356 | CGF.Builder.CreateUnreachable(); |
| 1357 | } |
| 1358 | |
Anders Carlsson | 3f6c5e1 | 2011-04-18 00:57:03 +0000 | [diff] [blame] | 1359 | static llvm::Value *EmitTypeidFromVTable(CodeGenFunction &CGF, |
| 1360 | const Expr *E, |
| 1361 | const llvm::Type *StdTypeInfoPtrTy) { |
| 1362 | // Get the vtable pointer. |
| 1363 | llvm::Value *ThisPtr = CGF.EmitLValue(E).getAddress(); |
| 1364 | |
| 1365 | // C++ [expr.typeid]p2: |
| 1366 | // If the glvalue expression is obtained by applying the unary * operator to |
| 1367 | // a pointer and the pointer is a null pointer value, the typeid expression |
| 1368 | // throws the std::bad_typeid exception. |
| 1369 | if (const UnaryOperator *UO = dyn_cast<UnaryOperator>(E->IgnoreParens())) { |
| 1370 | if (UO->getOpcode() == UO_Deref) { |
| 1371 | llvm::BasicBlock *BadTypeidBlock = |
| 1372 | CGF.createBasicBlock("typeid.bad_typeid"); |
| 1373 | llvm::BasicBlock *EndBlock = |
| 1374 | CGF.createBasicBlock("typeid.end"); |
| 1375 | |
| 1376 | llvm::Value *IsNull = CGF.Builder.CreateIsNull(ThisPtr); |
| 1377 | CGF.Builder.CreateCondBr(IsNull, BadTypeidBlock, EndBlock); |
| 1378 | |
| 1379 | CGF.EmitBlock(BadTypeidBlock); |
| 1380 | EmitBadTypeidCall(CGF); |
| 1381 | CGF.EmitBlock(EndBlock); |
| 1382 | } |
| 1383 | } |
| 1384 | |
| 1385 | llvm::Value *Value = CGF.GetVTablePtr(ThisPtr, |
| 1386 | StdTypeInfoPtrTy->getPointerTo()); |
| 1387 | |
| 1388 | // Load the type info. |
| 1389 | Value = CGF.Builder.CreateConstInBoundsGEP1_64(Value, -1ULL); |
| 1390 | return CGF.Builder.CreateLoad(Value); |
| 1391 | } |
| 1392 | |
John McCall | 3ad32c8 | 2011-01-28 08:37:24 +0000 | [diff] [blame] | 1393 | llvm::Value *CodeGenFunction::EmitCXXTypeidExpr(const CXXTypeidExpr *E) { |
Anders Carlsson | 3f6c5e1 | 2011-04-18 00:57:03 +0000 | [diff] [blame] | 1394 | const llvm::Type *StdTypeInfoPtrTy = |
| 1395 | ConvertType(E->getType())->getPointerTo(); |
Anders Carlsson | 31b7f52 | 2009-12-11 02:46:30 +0000 | [diff] [blame] | 1396 | |
Anders Carlsson | 1d7088d | 2009-12-17 07:09:17 +0000 | [diff] [blame] | 1397 | if (E->isTypeOperand()) { |
| 1398 | llvm::Constant *TypeInfo = |
| 1399 | CGM.GetAddrOfRTTIDescriptor(E->getTypeOperand()); |
Anders Carlsson | 3f6c5e1 | 2011-04-18 00:57:03 +0000 | [diff] [blame] | 1400 | return Builder.CreateBitCast(TypeInfo, StdTypeInfoPtrTy); |
Anders Carlsson | 1d7088d | 2009-12-17 07:09:17 +0000 | [diff] [blame] | 1401 | } |
Anders Carlsson | 4bdbc0c | 2011-04-11 14:13:40 +0000 | [diff] [blame] | 1402 | |
Anders Carlsson | 3f6c5e1 | 2011-04-18 00:57:03 +0000 | [diff] [blame] | 1403 | // C++ [expr.typeid]p2: |
| 1404 | // When typeid is applied to a glvalue expression whose type is a |
| 1405 | // polymorphic class type, the result refers to a std::type_info object |
| 1406 | // representing the type of the most derived object (that is, the dynamic |
| 1407 | // type) to which the glvalue refers. |
| 1408 | if (E->getExprOperand()->isGLValue()) { |
| 1409 | if (const RecordType *RT = |
| 1410 | E->getExprOperand()->getType()->getAs<RecordType>()) { |
| 1411 | const CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl()); |
| 1412 | if (RD->isPolymorphic()) |
| 1413 | return EmitTypeidFromVTable(*this, E->getExprOperand(), |
| 1414 | StdTypeInfoPtrTy); |
Anders Carlsson | 1d7088d | 2009-12-17 07:09:17 +0000 | [diff] [blame] | 1415 | } |
Mike Stump | c2e84ae | 2009-11-15 08:09:41 +0000 | [diff] [blame] | 1416 | } |
Anders Carlsson | 3f6c5e1 | 2011-04-18 00:57:03 +0000 | [diff] [blame] | 1417 | |
| 1418 | QualType OperandTy = E->getExprOperand()->getType(); |
| 1419 | return Builder.CreateBitCast(CGM.GetAddrOfRTTIDescriptor(OperandTy), |
| 1420 | StdTypeInfoPtrTy); |
Mike Stump | c2e84ae | 2009-11-15 08:09:41 +0000 | [diff] [blame] | 1421 | } |
Mike Stump | c849c05 | 2009-11-16 06:50:58 +0000 | [diff] [blame] | 1422 | |
Anders Carlsson | f0cb4a6 | 2011-04-11 00:46:40 +0000 | [diff] [blame] | 1423 | static llvm::Constant *getDynamicCastFn(CodeGenFunction &CGF) { |
| 1424 | // void *__dynamic_cast(const void *sub, |
| 1425 | // const abi::__class_type_info *src, |
| 1426 | // const abi::__class_type_info *dst, |
| 1427 | // std::ptrdiff_t src2dst_offset); |
| 1428 | |
| 1429 | const llvm::Type *Int8PtrTy = llvm::Type::getInt8PtrTy(CGF.getLLVMContext()); |
| 1430 | const llvm::Type *PtrDiffTy = |
| 1431 | CGF.ConvertType(CGF.getContext().getPointerDiffType()); |
| 1432 | |
| 1433 | const llvm::Type *Args[4] = { Int8PtrTy, Int8PtrTy, Int8PtrTy, PtrDiffTy }; |
| 1434 | |
| 1435 | const llvm::FunctionType *FTy = |
| 1436 | llvm::FunctionType::get(Int8PtrTy, Args, false); |
| 1437 | |
| 1438 | return CGF.CGM.CreateRuntimeFunction(FTy, "__dynamic_cast"); |
| 1439 | } |
| 1440 | |
| 1441 | static llvm::Constant *getBadCastFn(CodeGenFunction &CGF) { |
| 1442 | // void __cxa_bad_cast(); |
| 1443 | |
| 1444 | const llvm::Type *VoidTy = llvm::Type::getVoidTy(CGF.getLLVMContext()); |
| 1445 | const llvm::FunctionType *FTy = |
| 1446 | llvm::FunctionType::get(VoidTy, false); |
| 1447 | |
| 1448 | return CGF.CGM.CreateRuntimeFunction(FTy, "__cxa_bad_cast"); |
| 1449 | } |
| 1450 | |
Anders Carlsson | 3ddcdd5 | 2011-04-11 01:45:29 +0000 | [diff] [blame] | 1451 | static void EmitBadCastCall(CodeGenFunction &CGF) { |
Anders Carlsson | ad3692bb | 2011-04-13 02:35:36 +0000 | [diff] [blame] | 1452 | llvm::Value *Fn = getBadCastFn(CGF); |
| 1453 | CGF.EmitCallOrInvoke(Fn, 0, 0).setDoesNotReturn(); |
Anders Carlsson | 3ddcdd5 | 2011-04-11 01:45:29 +0000 | [diff] [blame] | 1454 | CGF.Builder.CreateUnreachable(); |
| 1455 | } |
| 1456 | |
Anders Carlsson | f0cb4a6 | 2011-04-11 00:46:40 +0000 | [diff] [blame] | 1457 | static llvm::Value * |
| 1458 | EmitDynamicCastCall(CodeGenFunction &CGF, llvm::Value *Value, |
| 1459 | QualType SrcTy, QualType DestTy, |
| 1460 | llvm::BasicBlock *CastEnd) { |
| 1461 | const llvm::Type *PtrDiffLTy = |
| 1462 | CGF.ConvertType(CGF.getContext().getPointerDiffType()); |
| 1463 | const llvm::Type *DestLTy = CGF.ConvertType(DestTy); |
| 1464 | |
| 1465 | if (const PointerType *PTy = DestTy->getAs<PointerType>()) { |
| 1466 | if (PTy->getPointeeType()->isVoidType()) { |
| 1467 | // C++ [expr.dynamic.cast]p7: |
| 1468 | // If T is "pointer to cv void," then the result is a pointer to the |
| 1469 | // most derived object pointed to by v. |
| 1470 | |
| 1471 | // Get the vtable pointer. |
| 1472 | llvm::Value *VTable = CGF.GetVTablePtr(Value, PtrDiffLTy->getPointerTo()); |
| 1473 | |
| 1474 | // Get the offset-to-top from the vtable. |
| 1475 | llvm::Value *OffsetToTop = |
| 1476 | CGF.Builder.CreateConstInBoundsGEP1_64(VTable, -2ULL); |
| 1477 | OffsetToTop = CGF.Builder.CreateLoad(OffsetToTop, "offset.to.top"); |
| 1478 | |
| 1479 | // Finally, add the offset to the pointer. |
| 1480 | Value = CGF.EmitCastToVoidPtr(Value); |
| 1481 | Value = CGF.Builder.CreateInBoundsGEP(Value, OffsetToTop); |
| 1482 | |
| 1483 | return CGF.Builder.CreateBitCast(Value, DestLTy); |
| 1484 | } |
| 1485 | } |
| 1486 | |
| 1487 | QualType SrcRecordTy; |
| 1488 | QualType DestRecordTy; |
| 1489 | |
| 1490 | if (const PointerType *DestPTy = DestTy->getAs<PointerType>()) { |
| 1491 | SrcRecordTy = SrcTy->castAs<PointerType>()->getPointeeType(); |
| 1492 | DestRecordTy = DestPTy->getPointeeType(); |
| 1493 | } else { |
| 1494 | SrcRecordTy = SrcTy; |
| 1495 | DestRecordTy = DestTy->castAs<ReferenceType>()->getPointeeType(); |
| 1496 | } |
| 1497 | |
| 1498 | assert(SrcRecordTy->isRecordType() && "source type must be a record type!"); |
| 1499 | assert(DestRecordTy->isRecordType() && "dest type must be a record type!"); |
| 1500 | |
| 1501 | llvm::Value *SrcRTTI = |
| 1502 | CGF.CGM.GetAddrOfRTTIDescriptor(SrcRecordTy.getUnqualifiedType()); |
| 1503 | llvm::Value *DestRTTI = |
| 1504 | CGF.CGM.GetAddrOfRTTIDescriptor(DestRecordTy.getUnqualifiedType()); |
| 1505 | |
| 1506 | // FIXME: Actually compute a hint here. |
| 1507 | llvm::Value *OffsetHint = llvm::ConstantInt::get(PtrDiffLTy, -1ULL); |
| 1508 | |
| 1509 | // Emit the call to __dynamic_cast. |
| 1510 | Value = CGF.EmitCastToVoidPtr(Value); |
| 1511 | Value = CGF.Builder.CreateCall4(getDynamicCastFn(CGF), Value, |
| 1512 | SrcRTTI, DestRTTI, OffsetHint); |
| 1513 | Value = CGF.Builder.CreateBitCast(Value, DestLTy); |
| 1514 | |
| 1515 | /// C++ [expr.dynamic.cast]p9: |
| 1516 | /// A failed cast to reference type throws std::bad_cast |
| 1517 | if (DestTy->isReferenceType()) { |
| 1518 | llvm::BasicBlock *BadCastBlock = |
| 1519 | CGF.createBasicBlock("dynamic_cast.bad_cast"); |
| 1520 | |
| 1521 | llvm::Value *IsNull = CGF.Builder.CreateIsNull(Value); |
| 1522 | CGF.Builder.CreateCondBr(IsNull, BadCastBlock, CastEnd); |
| 1523 | |
| 1524 | CGF.EmitBlock(BadCastBlock); |
Anders Carlsson | 3ddcdd5 | 2011-04-11 01:45:29 +0000 | [diff] [blame] | 1525 | EmitBadCastCall(CGF); |
Anders Carlsson | f0cb4a6 | 2011-04-11 00:46:40 +0000 | [diff] [blame] | 1526 | } |
| 1527 | |
| 1528 | return Value; |
| 1529 | } |
| 1530 | |
Anders Carlsson | 3ddcdd5 | 2011-04-11 01:45:29 +0000 | [diff] [blame] | 1531 | static llvm::Value *EmitDynamicCastToNull(CodeGenFunction &CGF, |
| 1532 | QualType DestTy) { |
| 1533 | const llvm::Type *DestLTy = CGF.ConvertType(DestTy); |
| 1534 | if (DestTy->isPointerType()) |
| 1535 | return llvm::Constant::getNullValue(DestLTy); |
| 1536 | |
| 1537 | /// C++ [expr.dynamic.cast]p9: |
| 1538 | /// A failed cast to reference type throws std::bad_cast |
| 1539 | EmitBadCastCall(CGF); |
| 1540 | |
| 1541 | CGF.EmitBlock(CGF.createBasicBlock("dynamic_cast.end")); |
| 1542 | return llvm::UndefValue::get(DestLTy); |
| 1543 | } |
| 1544 | |
Anders Carlsson | f0cb4a6 | 2011-04-11 00:46:40 +0000 | [diff] [blame] | 1545 | llvm::Value *CodeGenFunction::EmitDynamicCast(llvm::Value *Value, |
Mike Stump | c849c05 | 2009-11-16 06:50:58 +0000 | [diff] [blame] | 1546 | const CXXDynamicCastExpr *DCE) { |
Anders Carlsson | 1d7088d | 2009-12-17 07:09:17 +0000 | [diff] [blame] | 1547 | QualType DestTy = DCE->getTypeAsWritten(); |
Anders Carlsson | f0cb4a6 | 2011-04-11 00:46:40 +0000 | [diff] [blame] | 1548 | |
Anders Carlsson | 3ddcdd5 | 2011-04-11 01:45:29 +0000 | [diff] [blame] | 1549 | if (DCE->isAlwaysNull()) |
| 1550 | return EmitDynamicCastToNull(*this, DestTy); |
| 1551 | |
| 1552 | QualType SrcTy = DCE->getSubExpr()->getType(); |
| 1553 | |
Anders Carlsson | f0cb4a6 | 2011-04-11 00:46:40 +0000 | [diff] [blame] | 1554 | // C++ [expr.dynamic.cast]p4: |
| 1555 | // If the value of v is a null pointer value in the pointer case, the result |
| 1556 | // is the null pointer value of type T. |
| 1557 | bool ShouldNullCheckSrcValue = SrcTy->isPointerType(); |
Anders Carlsson | 1d7088d | 2009-12-17 07:09:17 +0000 | [diff] [blame] | 1558 | |
Anders Carlsson | f0cb4a6 | 2011-04-11 00:46:40 +0000 | [diff] [blame] | 1559 | llvm::BasicBlock *CastNull = 0; |
| 1560 | llvm::BasicBlock *CastNotNull = 0; |
| 1561 | llvm::BasicBlock *CastEnd = createBasicBlock("dynamic_cast.end"); |
Mike Stump | c849c05 | 2009-11-16 06:50:58 +0000 | [diff] [blame] | 1562 | |
Anders Carlsson | f0cb4a6 | 2011-04-11 00:46:40 +0000 | [diff] [blame] | 1563 | if (ShouldNullCheckSrcValue) { |
| 1564 | CastNull = createBasicBlock("dynamic_cast.null"); |
| 1565 | CastNotNull = createBasicBlock("dynamic_cast.notnull"); |
| 1566 | |
| 1567 | llvm::Value *IsNull = Builder.CreateIsNull(Value); |
| 1568 | Builder.CreateCondBr(IsNull, CastNull, CastNotNull); |
| 1569 | EmitBlock(CastNotNull); |
Mike Stump | c849c05 | 2009-11-16 06:50:58 +0000 | [diff] [blame] | 1570 | } |
| 1571 | |
Anders Carlsson | f0cb4a6 | 2011-04-11 00:46:40 +0000 | [diff] [blame] | 1572 | Value = EmitDynamicCastCall(*this, Value, SrcTy, DestTy, CastEnd); |
| 1573 | |
| 1574 | if (ShouldNullCheckSrcValue) { |
| 1575 | EmitBranch(CastEnd); |
| 1576 | |
| 1577 | EmitBlock(CastNull); |
| 1578 | EmitBranch(CastEnd); |
| 1579 | } |
| 1580 | |
| 1581 | EmitBlock(CastEnd); |
| 1582 | |
| 1583 | if (ShouldNullCheckSrcValue) { |
| 1584 | llvm::PHINode *PHI = Builder.CreatePHI(Value->getType(), 2); |
| 1585 | PHI->addIncoming(Value, CastNotNull); |
| 1586 | PHI->addIncoming(llvm::Constant::getNullValue(Value->getType()), CastNull); |
| 1587 | |
| 1588 | Value = PHI; |
| 1589 | } |
| 1590 | |
| 1591 | return Value; |
Mike Stump | c849c05 | 2009-11-16 06:50:58 +0000 | [diff] [blame] | 1592 | } |