[cfe-commits] r165710 - in /cfe/trunk: include/clang/AST/ExprCXX.h lib/AST/ExprCXX.cpp lib/CodeGen/CGExpr.cpp lib/CodeGen/CGExprConstant.cpp lib/CodeGen/CodeGenFunction.h lib/CodeGen/CodeGenModule.cpp lib/CodeGen/CodeGenModule.h lib/Sema/SemaExpr
Sean Silva
silvas at purdue.edu
Thu Oct 11 17:14:06 PDT 2012
+ if (i == 8 || i == 13 || i == 18 || i == 23) assert(Uuidstr[i] == '-');
+ else assert(isxdigit(Uuidstr[i]));
What's up with the formatting here? Also, it would be nice if the
assertions had some sort of message so that the "assertion failed"
message is maximally useful.
+ llvm::APInt Field3Values[] = {
+ llvm::APInt(8, StringRef(Uuidstr + 19, 2), 16),
+ llvm::APInt(8, StringRef(Uuidstr + 21, 2), 16),
+ llvm::APInt(8, StringRef(Uuidstr + 24, 2), 16),
+ llvm::APInt(8, StringRef(Uuidstr + 26, 2), 16),
+ llvm::APInt(8, StringRef(Uuidstr + 28, 2), 16),
+ llvm::APInt(8, StringRef(Uuidstr + 30, 2), 16),
+ llvm::APInt(8, StringRef(Uuidstr + 32, 2), 16),
+ llvm::APInt(8, StringRef(Uuidstr + 34, 2), 16),
+ };
+
+ APValue InitStruct(APValue::UninitStruct(), /*NumBases=*/0, /*NumFields=*/4);
+ InitStruct.getStructField(0) = APValue(llvm::APSInt(Field0));
+ InitStruct.getStructField(1) = APValue(llvm::APSInt(Field1));
+ InitStruct.getStructField(2) = APValue(llvm::APSInt(Field2));
+ APValue& Arr = InitStruct.getStructField(3);
+ Arr = APValue(APValue::UninitArray(), 8, 8);
+ for (int t = 0; t < 8; ++t)
+ Arr.getArrayInitializedElt(t) = APValue(llvm::APSInt(Field3Values[t]));
This large array of APInt could probably be factored to be just an
array of int of the offsets, and then the for loop could be like
for (int I = 0; I < array_lengthof(Field3Values); ++I)
Arr.getArrayInitializedElt(I) = APValue(llvm::APSInt(llvm::APInt(8,
StringRef(Uuidstr + Field3Values[I], 2), 16)));
or similar. The array_lengthof() is probably worth putting in even if
you don't factor Field3Values like this.
-- Sean Silva
On Thu, Oct 11, 2012 at 6:13 AM, Nico Weber <nicolasweber at gmx.de> wrote:
> Author: nico
> Date: Thu Oct 11 05:13:44 2012
> New Revision: 165710
>
> URL: http://llvm.org/viewvc/llvm-project?rev=165710&view=rev
> Log:
> Add codegen support for __uuidof().
>
>
> Added:
> cfe/trunk/test/CodeGenCXX/microsoft-uuidof-unsupported-target.cpp
> cfe/trunk/test/CodeGenCXX/microsoft-uuidof.cpp
> Modified:
> cfe/trunk/include/clang/AST/ExprCXX.h
> cfe/trunk/lib/AST/ExprCXX.cpp
> cfe/trunk/lib/CodeGen/CGExpr.cpp
> cfe/trunk/lib/CodeGen/CGExprConstant.cpp
> cfe/trunk/lib/CodeGen/CodeGenFunction.h
> cfe/trunk/lib/CodeGen/CodeGenModule.cpp
> cfe/trunk/lib/CodeGen/CodeGenModule.h
> cfe/trunk/lib/Sema/SemaExprCXX.cpp
>
> Modified: cfe/trunk/include/clang/AST/ExprCXX.h
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/AST/ExprCXX.h?rev=165710&r1=165709&r2=165710&view=diff
> ==============================================================================
> --- cfe/trunk/include/clang/AST/ExprCXX.h (original)
> +++ cfe/trunk/include/clang/AST/ExprCXX.h Thu Oct 11 05:13:44 2012
> @@ -625,6 +625,9 @@
> }
> static bool classof(const CXXUuidofExpr *) { return true; }
>
> + /// Grabs __declspec(uuid()) off a type, or returns 0 if there is none.
> + static UuidAttr *GetUuidAttrOfType(QualType QT);
> +
> // Iterators
> child_range children() {
> if (isTypeOperand()) return child_range();
>
> Modified: cfe/trunk/lib/AST/ExprCXX.cpp
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/AST/ExprCXX.cpp?rev=165710&r1=165709&r2=165710&view=diff
> ==============================================================================
> --- cfe/trunk/lib/AST/ExprCXX.cpp (original)
> +++ cfe/trunk/lib/AST/ExprCXX.cpp Thu Oct 11 05:13:44 2012
> @@ -51,6 +51,26 @@
> .getUnqualifiedType();
> }
>
> +// static
> +UuidAttr *CXXUuidofExpr::GetUuidAttrOfType(QualType QT) {
> + // Optionally remove one level of pointer, reference or array indirection.
> + const Type *Ty = QT.getTypePtr();
> + if (QT->isPointerType() || QT->isReferenceType())
> + Ty = QT->getPointeeType().getTypePtr();
> + else if (QT->isArrayType())
> + Ty = cast<ArrayType>(QT)->getElementType().getTypePtr();
> +
> + // Loop all record redeclaration looking for an uuid attribute.
> + CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
> + for (CXXRecordDecl::redecl_iterator I = RD->redecls_begin(),
> + E = RD->redecls_end(); I != E; ++I) {
> + if (UuidAttr *Uuid = I->getAttr<UuidAttr>())
> + return Uuid;
> + }
> +
> + return 0;
> +}
> +
> // CXXScalarValueInitExpr
> SourceRange CXXScalarValueInitExpr::getSourceRange() const {
> SourceLocation Start = RParenLoc;
>
> Modified: cfe/trunk/lib/CodeGen/CGExpr.cpp
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CGExpr.cpp?rev=165710&r1=165709&r2=165710&view=diff
> ==============================================================================
> --- cfe/trunk/lib/CodeGen/CGExpr.cpp (original)
> +++ cfe/trunk/lib/CodeGen/CGExpr.cpp Thu Oct 11 05:13:44 2012
> @@ -720,7 +720,7 @@
> llvm_unreachable("cannot emit a property reference directly");
>
> case Expr::ObjCSelectorExprClass:
> - return EmitObjCSelectorLValue(cast<ObjCSelectorExpr>(E));
> + return EmitObjCSelectorLValue(cast<ObjCSelectorExpr>(E));
> case Expr::ObjCIsaExprClass:
> return EmitObjCIsaExpr(cast<ObjCIsaExpr>(E));
> case Expr::BinaryOperatorClass:
> @@ -757,6 +757,8 @@
> return EmitCXXConstructLValue(cast<CXXConstructExpr>(E));
> case Expr::CXXBindTemporaryExprClass:
> return EmitCXXBindTemporaryLValue(cast<CXXBindTemporaryExpr>(E));
> + case Expr::CXXUuidofExprClass:
> + return EmitCXXUuidofLValue(cast<CXXUuidofExpr>(E));
> case Expr::LambdaExprClass:
> return EmitLambdaLValue(cast<LambdaExpr>(E));
>
> @@ -2859,6 +2861,14 @@
> return MakeAddrLValue(EmitCXXTypeidExpr(E), E->getType());
> }
>
> +llvm::Value *CodeGenFunction::EmitCXXUuidofExpr(const CXXUuidofExpr *E) {
> + return CGM.GetAddrOfUuidDescriptor(E);
> +}
> +
> +LValue CodeGenFunction::EmitCXXUuidofLValue(const CXXUuidofExpr *E) {
> + return MakeAddrLValue(EmitCXXUuidofExpr(E), E->getType());
> +}
> +
> LValue
> CodeGenFunction::EmitCXXBindTemporaryLValue(const CXXBindTemporaryExpr *E) {
> AggValueSlot Slot = CreateAggTemp(E->getType(), "temp.lvalue");
>
> Modified: cfe/trunk/lib/CodeGen/CGExprConstant.cpp
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CGExprConstant.cpp?rev=165710&r1=165709&r2=165710&view=diff
> ==============================================================================
> --- cfe/trunk/lib/CodeGen/CGExprConstant.cpp (original)
> +++ cfe/trunk/lib/CodeGen/CGExprConstant.cpp Thu Oct 11 05:13:44 2012
> @@ -995,6 +995,9 @@
> T = Typeid->getExprOperand()->getType();
> return CGM.GetAddrOfRTTIDescriptor(T);
> }
> + case Expr::CXXUuidofExprClass: {
> + return CGM.GetAddrOfUuidDescriptor(cast<CXXUuidofExpr>(E));
> + }
> }
>
> return 0;
>
> Modified: cfe/trunk/lib/CodeGen/CodeGenFunction.h
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CodeGenFunction.h?rev=165710&r1=165709&r2=165710&view=diff
> ==============================================================================
> --- cfe/trunk/lib/CodeGen/CodeGenFunction.h (original)
> +++ cfe/trunk/lib/CodeGen/CodeGenFunction.h Thu Oct 11 05:13:44 2012
> @@ -1841,6 +1841,7 @@
>
> llvm::Value* EmitCXXTypeidExpr(const CXXTypeidExpr *E);
> llvm::Value *EmitDynamicCast(llvm::Value *V, const CXXDynamicCastExpr *DCE);
> + llvm::Value* EmitCXXUuidofExpr(const CXXUuidofExpr *E);
>
> void MaybeEmitStdInitializerListCleanup(llvm::Value *loc, const Expr *init);
> void EmitStdInitializerListCleanup(llvm::Value *loc,
> @@ -2210,6 +2211,7 @@
> LValue EmitCXXBindTemporaryLValue(const CXXBindTemporaryExpr *E);
> LValue EmitLambdaLValue(const LambdaExpr *E);
> LValue EmitCXXTypeidLValue(const CXXTypeidExpr *E);
> + LValue EmitCXXUuidofLValue(const CXXUuidofExpr *E);
>
> LValue EmitObjCMessageExprLValue(const ObjCMessageExpr *E);
> LValue EmitObjCIvarRefLValue(const ObjCIvarRefExpr *E);
>
> Modified: cfe/trunk/lib/CodeGen/CodeGenModule.cpp
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CodeGenModule.cpp?rev=165710&r1=165709&r2=165710&view=diff
> ==============================================================================
> --- cfe/trunk/lib/CodeGen/CodeGenModule.cpp (original)
> +++ cfe/trunk/lib/CodeGen/CodeGenModule.cpp Thu Oct 11 05:13:44 2012
> @@ -832,6 +832,49 @@
> return !getContext().DeclMustBeEmitted(Global);
> }
>
> +llvm::Constant *CodeGenModule::GetAddrOfUuidDescriptor(
> + const CXXUuidofExpr* E) {
> + // Sema has verified that IIDSource has a __declspec(uuid()), and that its
> + // well-formed.
> + StringRef Uuid;
> + if (E->isTypeOperand())
> + Uuid = CXXUuidofExpr::GetUuidAttrOfType(E->getTypeOperand())->getGuid();
> + else {
> + // Special case: __uuidof(0) means an all-zero GUID.
> + Expr *Op = E->getExprOperand();
> + if (!Op->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull))
> + Uuid = CXXUuidofExpr::GetUuidAttrOfType(Op->getType())->getGuid();
> + else
> + Uuid = "00000000-0000-0000-0000-000000000000";
> + }
> + std::string Name = "__uuid_" + Uuid.str();
> +
> + // Look for an existing global.
> + if (llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name))
> + return GV;
> +
> + llvm::Constant *Init = EmitUuidofInitializer(Uuid, E->getType());
> + assert(Init && "failed to initialize as constant");
> +
> + // GUIDs are assumed to be 16 bytes, spread over 4-2-2-8 bytes. However, the
> + // first field is declared as "long", which for many targets is 8 bytes.
> + // Those architectures are not supported. (With the MS abi, long is always 4
> + // bytes.)
> + llvm::Type *GuidType = getTypes().ConvertType(E->getType());
> + if (Init->getType() != GuidType) {
> + DiagnosticsEngine &Diags = getDiags();
> + unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
> + "__uuidof codegen is not supported on this architecture");
> + Diags.Report(E->getExprLoc(), DiagID) << E->getSourceRange();
> + Init = llvm::UndefValue::get(GuidType);
> + }
> +
> + llvm::GlobalVariable *GV = new llvm::GlobalVariable(getModule(), GuidType,
> + /*isConstant=*/true, llvm::GlobalValue::PrivateLinkage, Init, Name);
> + GV->setUnnamedAddr(true);
> + return GV;
> +}
> +
> llvm::Constant *CodeGenModule::GetWeakRefReference(const ValueDecl *VD) {
> const AliasAttr *AA = VD->getAttr<AliasAttr>();
> assert(AA && "No alias?");
> @@ -1286,7 +1329,7 @@
>
> // Because C++ name mangling, the only way we can end up with an already
> // existing global with the same name is if it has been declared extern "C".
> - assert(GV->isDeclaration() && "Declaration has wrong type!");
> + assert(GV->isDeclaration() && "Declaration has wrong type!");
> OldGV = GV;
> }
>
> @@ -2756,3 +2799,40 @@
> }
> }
> }
> +
> +llvm::Constant *CodeGenModule::EmitUuidofInitializer(StringRef Uuid,
> + QualType GuidType) {
> + // Sema has checked that all uuid strings are of the form
> + // "12345678-1234-1234-1234-1234567890ab".
> + assert(Uuid.size() == 36);
> + const char *Uuidstr = Uuid.data();
> + for (int i = 0; i < 36; ++i) {
> + if (i == 8 || i == 13 || i == 18 || i == 23) assert(Uuidstr[i] == '-');
> + else assert(isxdigit(Uuidstr[i]));
> + }
> +
> + llvm::APInt Field0(32, StringRef(Uuidstr , 8), 16);
> + llvm::APInt Field1(16, StringRef(Uuidstr + 9, 4), 16);
> + llvm::APInt Field2(16, StringRef(Uuidstr + 14, 4), 16);
> + llvm::APInt Field3Values[] = {
> + llvm::APInt(8, StringRef(Uuidstr + 19, 2), 16),
> + llvm::APInt(8, StringRef(Uuidstr + 21, 2), 16),
> + llvm::APInt(8, StringRef(Uuidstr + 24, 2), 16),
> + llvm::APInt(8, StringRef(Uuidstr + 26, 2), 16),
> + llvm::APInt(8, StringRef(Uuidstr + 28, 2), 16),
> + llvm::APInt(8, StringRef(Uuidstr + 30, 2), 16),
> + llvm::APInt(8, StringRef(Uuidstr + 32, 2), 16),
> + llvm::APInt(8, StringRef(Uuidstr + 34, 2), 16),
> + };
> +
> + APValue InitStruct(APValue::UninitStruct(), /*NumBases=*/0, /*NumFields=*/4);
> + InitStruct.getStructField(0) = APValue(llvm::APSInt(Field0));
> + InitStruct.getStructField(1) = APValue(llvm::APSInt(Field1));
> + InitStruct.getStructField(2) = APValue(llvm::APSInt(Field2));
> + APValue& Arr = InitStruct.getStructField(3);
> + Arr = APValue(APValue::UninitArray(), 8, 8);
> + for (int t = 0; t < 8; ++t)
> + Arr.getArrayInitializedElt(t) = APValue(llvm::APSInt(Field3Values[t]));
> +
> + return EmitConstantValue(InitStruct, GuidType);
> +}
>
> Modified: cfe/trunk/lib/CodeGen/CodeGenModule.h
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/CodeGen/CodeGenModule.h?rev=165710&r1=165709&r2=165710&view=diff
> ==============================================================================
> --- cfe/trunk/lib/CodeGen/CodeGenModule.h (original)
> +++ cfe/trunk/lib/CodeGen/CodeGenModule.h Thu Oct 11 05:13:44 2012
> @@ -549,6 +549,9 @@
> /// for the given type.
> llvm::Constant *GetAddrOfRTTIDescriptor(QualType Ty, bool ForEH = false);
>
> + /// GetAddrOfUuidDescriptor - Get the address of a uuid descriptor .
> + llvm::Constant *GetAddrOfUuidDescriptor(const CXXUuidofExpr* E);
> +
> /// GetAddrOfThunk - Get the address of the thunk for the given global decl.
> llvm::Constant *GetAddrOfThunk(GlobalDecl GD, const ThunkInfo &Thunk);
>
> @@ -985,6 +988,9 @@
> /// to emit the .gcno and .gcda files in a way that persists in .bc files.
> void EmitCoverageFile();
>
> + /// Emits the initializer for a uuidof string.
> + llvm::Constant *EmitUuidofInitializer(StringRef uuidstr, QualType IIDType);
> +
> /// MayDeferGeneration - Determine if the given decl can be emitted
> /// lazily; this is only relevant for definitions. The given decl
> /// must be either a function or var decl.
>
> Modified: cfe/trunk/lib/Sema/SemaExprCXX.cpp
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Sema/SemaExprCXX.cpp?rev=165710&r1=165709&r2=165710&view=diff
> ==============================================================================
> --- cfe/trunk/lib/Sema/SemaExprCXX.cpp (original)
> +++ cfe/trunk/lib/Sema/SemaExprCXX.cpp Thu Oct 11 05:13:44 2012
> @@ -410,33 +410,13 @@
> return BuildCXXTypeId(TypeInfoType, OpLoc, (Expr*)TyOrExpr, RParenLoc);
> }
>
> -/// Retrieve the UuidAttr associated with QT.
> -static UuidAttr *GetUuidAttrOfType(QualType QT) {
> - // Optionally remove one level of pointer, reference or array indirection.
> - const Type *Ty = QT.getTypePtr();
> - if (QT->isPointerType() || QT->isReferenceType())
> - Ty = QT->getPointeeType().getTypePtr();
> - else if (QT->isArrayType())
> - Ty = cast<ArrayType>(QT)->getElementType().getTypePtr();
> -
> - // Loop all record redeclaration looking for an uuid attribute.
> - CXXRecordDecl *RD = Ty->getAsCXXRecordDecl();
> - for (CXXRecordDecl::redecl_iterator I = RD->redecls_begin(),
> - E = RD->redecls_end(); I != E; ++I) {
> - if (UuidAttr *Uuid = I->getAttr<UuidAttr>())
> - return Uuid;
> - }
> -
> - return 0;
> -}
> -
> /// \brief Build a Microsoft __uuidof expression with a type operand.
> ExprResult Sema::BuildCXXUuidof(QualType TypeInfoType,
> SourceLocation TypeidLoc,
> TypeSourceInfo *Operand,
> SourceLocation RParenLoc) {
> if (!Operand->getType()->isDependentType()) {
> - if (!GetUuidAttrOfType(Operand->getType()))
> + if (!CXXUuidofExpr::GetUuidAttrOfType(Operand->getType()))
> return ExprError(Diag(TypeidLoc, diag::err_uuidof_without_guid));
> }
>
> @@ -452,7 +432,7 @@
> Expr *E,
> SourceLocation RParenLoc) {
> if (!E->getType()->isDependentType()) {
> - if (!GetUuidAttrOfType(E->getType()) &&
> + if (!CXXUuidofExpr::GetUuidAttrOfType(E->getType()) &&
> !E->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull))
> return ExprError(Diag(TypeidLoc, diag::err_uuidof_without_guid));
> }
>
> Added: cfe/trunk/test/CodeGenCXX/microsoft-uuidof-unsupported-target.cpp
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGenCXX/microsoft-uuidof-unsupported-target.cpp?rev=165710&view=auto
> ==============================================================================
> --- cfe/trunk/test/CodeGenCXX/microsoft-uuidof-unsupported-target.cpp (added)
> +++ cfe/trunk/test/CodeGenCXX/microsoft-uuidof-unsupported-target.cpp Thu Oct 11 05:13:44 2012
> @@ -0,0 +1,13 @@
> +// RUN: %clang_cc1 -emit-llvm %s -o - -triple=x86_64-apple-macosx10.8.0 -fms-extensions -verify
> +
> +typedef struct _GUID
> +{
> + unsigned long Data1;
> + unsigned short Data2;
> + unsigned short Data3;
> + unsigned char Data4[8];
> +} GUID;
> +
> +struct __declspec(uuid("87654321-4321-4321-4321-ba0987654321")) S { };
> +
> +GUID g = __uuidof(S); // expected-error {{__uuidof codegen is not supported on this architecture}}
>
> Added: cfe/trunk/test/CodeGenCXX/microsoft-uuidof.cpp
> URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGenCXX/microsoft-uuidof.cpp?rev=165710&view=auto
> ==============================================================================
> --- cfe/trunk/test/CodeGenCXX/microsoft-uuidof.cpp (added)
> +++ cfe/trunk/test/CodeGenCXX/microsoft-uuidof.cpp Thu Oct 11 05:13:44 2012
> @@ -0,0 +1,72 @@
> +// RUN: %clang_cc1 -emit-llvm %s -o - -triple=i386-pc-win32 -fms-extensions | FileCheck %s
> +
> +typedef struct _GUID
> +{
> + unsigned long Data1;
> + unsigned short Data2;
> + unsigned short Data3;
> + unsigned char Data4[8];
> +} GUID;
> +
> +struct __declspec(uuid("12345678-1234-1234-1234-1234567890ab")) S1 { } s1;
> +struct __declspec(uuid("87654321-4321-4321-4321-ba0987654321")) S2 { };
> +
> +// This gets initialized in a static initializer.
> +// CHECK: @g = global %struct._GUID zeroinitializer, align 4
> +GUID g = __uuidof(S1);
> +
> +// First global use of __uuidof(S1) forces the creation of the global.
> +// CHECK: @__uuid_12345678-1234-1234-1234-1234567890ab = private unnamed_addr constant %struct._GUID { i32 305419896, i16 4660, i16 4660, [8 x i8] c"\124\124Vx\90\AB" }
> +// CHECK: @gr = constant %struct._GUID* @__uuid_12345678-1234-1234-1234-1234567890ab, align 4
> +const GUID& gr = __uuidof(S1);
> +
> +// CHECK: @gp = global %struct._GUID* @__uuid_12345678-1234-1234-1234-1234567890ab, align 4
> +const GUID* gp = &__uuidof(S1);
> +
> +// Special case: _uuidof(0)
> +// CHECK: @zeroiid = constant %struct._GUID* @__uuid_00000000-0000-0000-0000-000000000000, align 4
> +const GUID& zeroiid = __uuidof(0);
> +
> +// __uuidof(S2) hasn't been used globally yet, so it's emitted when it's used
> +// in a function and is emitted at the end of the globals section.
> +// CHECK: @__uuid_87654321-4321-4321-4321-ba0987654321 = private unnamed_addr constant %struct._GUID { i32 -2023406815, i16 17185, i16 17185, [8 x i8] c"C!\BA\09\87eC!" }
> +
> +// The static initializer for g.
> +// CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* bitcast (%struct._GUID* @g to i8*), i8* bitcast (%struct._GUID* @__uuid_12345678-1234-1234-1234-1234567890ab to i8*), i32 16, i32 4, i1 false)
> +
> +void fun() {
> + // CHECK: %s1_1 = alloca %struct._GUID, align 4
> + // CHECK: %s1_2 = alloca %struct._GUID, align 4
> + // CHECK: %s1_3 = alloca %struct._GUID, align 4
> +
> + // CHECK: %0 = bitcast %struct._GUID* %s1_1 to i8*
> + // CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %0, i8* bitcast (%struct._GUID* @__uuid_12345678-1234-1234-1234-1234567890ab to i8*), i32 16, i32 4, i1 false)
> + GUID s1_1 = __uuidof(S1);
> +
> + // CHECK: %1 = bitcast %struct._GUID* %s1_2 to i8*
> + // CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %1, i8* bitcast (%struct._GUID* @__uuid_12345678-1234-1234-1234-1234567890ab to i8*), i32 16, i32 4, i1 false)
> + GUID s1_2 = __uuidof(S1);
> +
> + // CHECK: %2 = bitcast %struct._GUID* %s1_3 to i8*
> + // CHECK: call void @llvm.memcpy.p0i8.p0i8.i32(i8* %2, i8* bitcast (%struct._GUID* @__uuid_12345678-1234-1234-1234-1234567890ab to i8*), i32 16, i32 4, i1 false)
> + GUID s1_3 = __uuidof(s1);
> +}
> +
> +void gun() {
> + // CHECK: %s2_1 = alloca %struct._GUID, align 4
> + // CHECK: %s2_2 = alloca %struct._GUID, align 4
> + // CHECK: %r = alloca %struct._GUID*, align 4
> + // CHECK: %p = alloca %struct._GUID*, align 4
> + // CHECK: %zeroiid = alloca %struct._GUID*, align 4
> + GUID s2_1 = __uuidof(S2);
> + GUID s2_2 = __uuidof(S2);
> +
> + // CHECK: store %struct._GUID* @__uuid_87654321-4321-4321-4321-ba0987654321, %struct._GUID** %r, align 4
> + const GUID& r = __uuidof(S2);
> + // CHECK: store %struct._GUID* @__uuid_87654321-4321-4321-4321-ba0987654321, %struct._GUID** %p, align 4
> + const GUID* p = &__uuidof(S2);
> +
> + // Special case _uuidof(0), local scope version.
> + // CHECK: store %struct._GUID* @__uuid_00000000-0000-0000-0000-000000000000, %struct._GUID** %zeroiid, align 4
> + const GUID& zeroiid = __uuidof(0);
> +}
>
>
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