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c++: support gcc's application of weak attribute on

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class declaration which forces any such class and any 
class that inherits from such a class to have their 
typeinfo symbols be marked as weak.
// rdar://10246395
A    test/CodeGenCXX/weak-extern-typeinfo.cpp
M    lib/Sema/SemaDeclCXX.cpp
M    lib/Sema/SemaDeclAttr.cpp
M    lib/CodeGen/CGRTTI.cpp

llvm-svn: 142693
This commit is contained in:
Fariborz Jahanian 2011-10-21 22:27:12 +00:00
parent 197ca87e7e
commit 47f9a73f51
4 changed files with 57 additions and 0 deletions
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2
clang/lib/CodeGen/CGRTTI.cpp
View File

@ -336,6 +336,8 @@ getTypeInfoLinkage(CodeGenModule &CGM, QualType Ty) {
if (const RecordType *Record = dyn_cast<RecordType>(Ty)) {
const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl());
if (RD->hasAttr<WeakAttr>())
return llvm::GlobalValue::WeakODRLinkage;
if (RD->isDynamicClass())
return CGM.getVTableLinkage(RD);
}

4
clang/lib/Sema/SemaDeclAttr.cpp
View File

@ -1914,6 +1914,10 @@ static void handleWeakAttr(Sema &S, Decl *D, const AttributeList &Attr) {
}
if (!isa<VarDecl>(D) && !isa<FunctionDecl>(D)) {
if (isa<CXXRecordDecl>(D)) {
D->addAttr(::new (S.Context) WeakAttr(Attr.getRange(), S.Context));
return;
}
S.Diag(Attr.getLoc(), diag::warn_attribute_wrong_decl_type)
<< Attr.getName() << ExpectedVariableOrFunction;
return;

4
clang/lib/Sema/SemaDeclCXX.cpp
View File

@ -1151,6 +1151,10 @@ bool Sema::AttachBaseSpecifiers(CXXRecordDecl *Class, CXXBaseSpecifier **Bases,
// Okay, add this new base class.
KnownBaseTypes[NewBaseType] = Bases[idx];
Bases[NumGoodBases++] = Bases[idx];
if (const RecordType *Record = dyn_cast<RecordType>(NewBaseType))
if (const CXXRecordDecl *RD = cast<CXXRecordDecl>(Record->getDecl()))
if (RD->hasAttr<WeakAttr>())
Class->addAttr(::new (Context) WeakAttr(SourceRange(), Context));
}
}

47
clang/test/CodeGenCXX/weak-extern-typeinfo.cpp Normal file
View File

@ -0,0 +1,47 @@
// RUN: %clang_cc1 %s -emit-llvm -o - | FileCheck %s
// rdar://10246395
#define WEAK __attribute__ ((weak))
class WEAK A {
virtual void foo();
};
class B : public A {
virtual void foo();
};
void A::foo() { }
void B::foo() { }
class T {};
class T1 {};
class C : public T1, public B, public T {
virtual void foo();
};
void C::foo() { }
class V1 : public virtual A {
virtual void foo();
};
class V2 : public virtual V1 {
virtual void foo();
};
void V1::foo() { }
void V2::foo() { }
// CHECK: @_ZTS1A = weak_odr constant
// CHECK: @_ZTI1A = weak_odr unnamed_addr constant
// CHECK: @_ZTS1B = weak_odr constant
// CHECK: @_ZTI1B = weak_odr unnamed_addr constant
// CHECK: @_ZTS1C = weak_odr constant
// CHECK: @_ZTS2T1 = linkonce_odr constant
// CHECK: @_ZTI2T1 = linkonce_odr unnamed_addr constant
// CHECK: @_ZTS1T = linkonce_odr constant
// CHECK: @_ZTI1T = linkonce_odr unnamed_addr constant
// CHECK: @_ZTI1C = weak_odr unnamed_addr constant
// CHECK: @_ZTS2V1 = weak_odr constant
// CHECK: @_ZTI2V1 = weak_odr unnamed_addr constant
// CHECK: @_ZTS2V2 = weak_odr constant
// CHECK: @_ZTI2V2 = weak_odr unnamed_addr constant