ellis created this revision.
ellis added a reviewer: dblaikie.
ellis published this revision for review.
ellis added inline comments.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.
================
Comment at: clang/lib/AST/TypePrinter.cpp:242
case Type::ObjCObjectPointer:
CanPrefixQualifiers = T->isObjCIdType() || T->isObjCClassType() ||
T->isObjCQualifiedIdType() || T->isObjCQualifiedClassType();
----------------
Hi @dblaikie, I'm not familiar with this code but I'm wondering if these uses
of `T` should actually be `UnderlyingType`. Will this cause a crash similar to
what I found?
Clang will crash if it tries to compile the following code. This commit
fixes it.
$ cat foo.c
void foo(_Nullable int *ptr) {
__auto_type _Nonnull a = ptr;
};
$ clang foo.c -c -Wnullable-to-nonnull-conversion
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D116342
Files:
clang/lib/AST/TypePrinter.cpp
clang/test/Sema/nullability.c
Index: clang/test/Sema/nullability.c
===================================================================
--- clang/test/Sema/nullability.c
+++ clang/test/Sema/nullability.c
@@ -125,6 +125,7 @@
int *a = ptr; // okay
_Nonnull int *b = ptr; // expected-warning{{implicit conversion from
nullable pointer 'int * _Nullable' to non-nullable pointer type 'int *
_Nonnull'}}
b = ptr; // expected-warning{{implicit conversion from nullable pointer 'int
* _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
+ __auto_type _Nonnull c = ptr; // expected-warning{{implicit conversion from
nullable pointer 'int * _Nullable' to non-nullable pointer type 'int *
_Nullable _Nonnull'}}
accepts_nonnull_1(ptr); // expected-warning{{implicit conversion from
nullable pointer 'int * _Nullable' to non-nullable pointer type 'int *
_Nonnull'}}
}
Index: clang/lib/AST/TypePrinter.cpp
===================================================================
--- clang/lib/AST/TypePrinter.cpp
+++ clang/lib/AST/TypePrinter.cpp
@@ -280,7 +280,7 @@
case Type::Attributed: {
// We still want to print the address_space before the type if it is an
// address_space attribute.
- const auto *AttrTy = cast<AttributedType>(T);
+ const auto *AttrTy = cast<AttributedType>(UnderlyingType);
CanPrefixQualifiers = AttrTy->getAttrKind() == attr::AddressSpace;
}
}
Index: clang/test/Sema/nullability.c
===================================================================
--- clang/test/Sema/nullability.c
+++ clang/test/Sema/nullability.c
@@ -125,6 +125,7 @@
int *a = ptr; // okay
_Nonnull int *b = ptr; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
b = ptr; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
+ __auto_type _Nonnull c = ptr; // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nullable _Nonnull'}}
accepts_nonnull_1(ptr); // expected-warning{{implicit conversion from nullable pointer 'int * _Nullable' to non-nullable pointer type 'int * _Nonnull'}}
}
Index: clang/lib/AST/TypePrinter.cpp
===================================================================
--- clang/lib/AST/TypePrinter.cpp
+++ clang/lib/AST/TypePrinter.cpp
@@ -280,7 +280,7 @@
case Type::Attributed: {
// We still want to print the address_space before the type if it is an
// address_space attribute.
- const auto *AttrTy = cast<AttributedType>(T);
+ const auto *AttrTy = cast<AttributedType>(UnderlyingType);
CanPrefixQualifiers = AttrTy->getAttrKind() == attr::AddressSpace;
}
}
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