зеркало из https://github.com/microsoft/clang-1.git
Extend the "cannot convert from base class pointer to derived class
pointer" diagnostic to handle references, too. git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@107372 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1203,14 +1203,16 @@ def note_ovl_candidate_bad_cvr : Note<"candidate "
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"%select{const|volatile|const and volatile|restrict|const and restrict|"
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"volatile and restrict|const, volatile, and restrict}3 qualifier"
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"%select{||s||s|s|s}3">;
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def note_ovl_candidate_bad_base_to_derived_ptr_conv : Note<"candidate "
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def note_ovl_candidate_bad_base_to_derived_conv : Note<"candidate "
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"%select{function|function|constructor|"
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"function |function |constructor |"
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"constructor (the implicit default constructor)|"
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"constructor (the implicit copy constructor)|"
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"function (the implicit copy assignment operator)}0%1"
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" not viable: cannot convert from base class pointer %2 to derived class "
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"pointer %3 for %ordinal4 argument">;
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" not viable: cannot %select{convert from|convert from|bind}2 "
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"%select{base class pointer|superclass|base class object of type}2 %3 to "
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"%select{derived class pointer|subclass|derived class reference}2 %4 for "
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"%ordinal5 argument">;
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def note_ambiguous_type_conversion: Note<
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"because of ambiguity in conversion of %0 to %1">;
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@ -5486,7 +5486,7 @@ void DiagnoseBadConversion(Sema &S, OverloadCandidate *Cand, unsigned I) {
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}
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// Diagnose base -> derived pointer conversions.
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bool IsBaseToDerivedConversion = false;
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unsigned BaseToDerivedConversion = 0;
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if (const PointerType *FromPtrTy = FromTy->getAs<PointerType>()) {
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if (const PointerType *ToPtrTy = ToTy->getAs<PointerType>()) {
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if (ToPtrTy->getPointeeType().isAtLeastAsQualifiedAs(
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@ -5495,7 +5495,7 @@ void DiagnoseBadConversion(Sema &S, OverloadCandidate *Cand, unsigned I) {
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!ToPtrTy->getPointeeType()->isIncompleteType() &&
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S.IsDerivedFrom(ToPtrTy->getPointeeType(),
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FromPtrTy->getPointeeType()))
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IsBaseToDerivedConversion = true;
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BaseToDerivedConversion = 1;
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}
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} else if (const ObjCObjectPointerType *FromPtrTy
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= FromTy->getAs<ObjCObjectPointerType>()) {
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@ -5506,13 +5506,21 @@ void DiagnoseBadConversion(Sema &S, OverloadCandidate *Cand, unsigned I) {
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if (ToPtrTy->getPointeeType().isAtLeastAsQualifiedAs(
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FromPtrTy->getPointeeType()) &&
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FromIface->isSuperClassOf(ToIface))
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IsBaseToDerivedConversion = true;
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}
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if (IsBaseToDerivedConversion) {
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BaseToDerivedConversion = 2;
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} else if (const ReferenceType *ToRefTy = ToTy->getAs<ReferenceType>()) {
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if (ToRefTy->getPointeeType().isAtLeastAsQualifiedAs(FromTy) &&
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!FromTy->isIncompleteType() &&
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!ToRefTy->getPointeeType()->isIncompleteType() &&
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S.IsDerivedFrom(ToRefTy->getPointeeType(), FromTy))
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BaseToDerivedConversion = 3;
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}
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if (BaseToDerivedConversion) {
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S.Diag(Fn->getLocation(),
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diag::note_ovl_candidate_bad_base_to_derived_ptr_conv)
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diag::note_ovl_candidate_bad_base_to_derived_conv)
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<< (unsigned) FnKind << FnDesc
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<< (FromExpr ? FromExpr->getSourceRange() : SourceRange())
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<< (BaseToDerivedConversion - 1)
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<< FromTy << ToTy << I+1;
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return;
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}
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@ -236,6 +236,12 @@ void intref_test() {
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float* ir2 = intref(5.5);
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}
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void derived5(C&); // expected-note{{candidate function not viable: cannot bind base class object of type 'A' to derived class reference 'C &' for 1st argument}}
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void test_base(A& a) {
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derived5(a); // expected-error{{no matching function for call to 'derived5}}
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}
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// Test reference binding vs. standard conversions.
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int& bind_vs_conv(const double&);
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float& bind_vs_conv(int);
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@ -39,7 +39,7 @@ void foo(const I *p, I* sel) {
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@interface DerivedFromI : I
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@end
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void accept_derived(DerivedFromI*); // expected-note{{candidate function not viable: cannot convert from base class pointer 'I *' to derived class pointer 'DerivedFromI *' for 1st argument}}
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void accept_derived(DerivedFromI*); // expected-note{{candidate function not viable: cannot convert from superclass 'I *' to subclass 'DerivedFromI *' for 1st argument}}
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void test_base_to_derived(I* i) {
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accept_derived(i); // expected-error{{no matching function for call to 'accept_derived'}}
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