#include "clang/AST/TemplateBase.h"
#include "clang/AST/Type.h"
#include "clang/Basic/CharInfo.h"
+#include "clang/Basic/LangOptions.h"
#include "clang/Basic/TypeTraits.h"
#include "llvm/ADT/APFloat.h"
#include "llvm/ADT/APSInt.h"
HadMultipleCandidates = V;
}
+ /// \brief Returns true if virtual dispatch is performed.
+ /// If the member access is fully qualified, (i.e. X::f()), virtual
+ /// dispatching is not performed. In -fapple-kext mode qualified
+ /// calls to virtual method will still go through the vtable.
+ bool performsVirtualDispatch(const LangOptions &LO) const {
+ return LO.AppleKext || !hasQualifier();
+ }
+
static bool classof(const Stmt *T) {
return T->getStmtClass() == MemberExprClass;
}
def note_pure_virtual_function : Note<
"unimplemented pure virtual method %0 in %1">;
+def note_pure_qualified_call_kext : Note<
+ "qualified call to %0::%1 is treated as a virtual call to %1 due to -fapple-kext">;
+
def err_deleted_decl_not_first : Error<
"deleted definition must be first declaration">;
"%q0 is not a member of class %1">;
def warn_call_to_pure_virtual_member_function_from_ctor_dtor : Warning<
- "call to pure virtual member function %0; overrides of %0 in subclasses are "
- "not available in the %select{constructor|destructor}1 of %2">;
+ "call to pure virtual member function %0 has undefined behavior; "
+ "overrides of %0 in subclasses are not available in the "
+ "%select{constructor|destructor}1 of %2">;
def note_member_declared_at : Note<"member is declared here">;
def note_ivar_decl : Note<"instance variable is declared here">;
if (!MD)
return;
// Only attempt to devirtualize if this is truly a virtual call.
- bool IsVirtualCall = MD->isVirtual() && !ME->hasQualifier();
+ bool IsVirtualCall = MD->isVirtual() &&
+ ME->performsVirtualDispatch(SemaRef.getLangOpts());
if (!IsVirtualCall)
return;
const Expr *Base = ME->getBase();
// expression, is odr-used, unless it is a pure virtual function and its
// name is not explicitly qualified.
bool OdrUse = true;
- if (!E->hasQualifier()) {
+ if (E->performsVirtualDispatch(getLangOpts())) {
if (CXXMethodDecl *Method = dyn_cast<CXXMethodDecl>(E->getMemberDecl()))
if (Method->isPure())
OdrUse = false;
TheCall->getMethodDecl()->isPure()) {
const CXXMethodDecl *MD = TheCall->getMethodDecl();
- if (isa<CXXThisExpr>(MemExpr->getBase()->IgnoreParenCasts())) {
- Diag(MemExpr->getLocStart(),
+ if (isa<CXXThisExpr>(MemExpr->getBase()->IgnoreParenCasts()) &&
+ MemExpr->performsVirtualDispatch(getLangOpts())) {
+ Diag(MemExpr->getLocStart(),
diag::warn_call_to_pure_virtual_member_function_from_ctor_dtor)
<< MD->getDeclName() << isa<CXXDestructorDecl>(CurContext)
<< MD->getParent()->getDeclName();
Diag(MD->getLocStart(), diag::note_previous_decl) << MD->getDeclName();
+ if (getLangOpts().AppleKext)
+ Diag(MemExpr->getLocStart(),
+ diag::note_pure_qualified_call_kext)
+ << MD->getParent()->getDeclName()
+ << MD->getDeclName();
}
}
return MaybeBindToTemporary(TheCall);
// RUN: %clang_cc1 %s -fsyntax-only -verify
struct A {
- A() { f(); } // expected-warning {{call to pure virtual member function 'f'; overrides of 'f' in subclasses are not available in the constructor of 'A'}}
- ~A() { f(); } // expected-warning {{call to pure virtual member function 'f'; overrides of 'f' in subclasses are not available in the destructor of 'A'}}
+ A() { f(); } // expected-warning {{call to pure virtual member function 'f' has undefined behavior; overrides of 'f' in subclasses are not available in the constructor of 'A'}}
+ ~A() { f(); } // expected-warning {{call to pure virtual member function 'f' has undefined behavior; overrides of 'f' in subclasses are not available in the destructor of 'A'}}
virtual void f() = 0; // expected-note 2 {{'f' declared here}}
};
B() { a->f(); };
~B() { a->f(); };
};
+
+// Don't warn if the call is fully qualified. (PR23215)
+struct C {
+ virtual void f() = 0;
+ C() {
+ C::f();
+ }
+};
--- /dev/null
+// RUN: %clang_cc1 %s -fapple-kext -fsyntax-only -verify
+
+struct A {
+ virtual void f() = 0; // expected-note {{'f' declared here}}
+ A() {
+ A::f(); // expected-warning {{call to pure virtual member function 'f' has undefined behavior; overrides of 'f' in subclasses are not available in the constructor of 'A'}} // expected-note {{qualified call to 'A'::'f' is treated as a virtual call to 'f' due to -fapple-kext}}
+ }
+};