llvm-project/clang/test/SemaCXX/warn-func-not-needed.cpp
Bruno Ricci eb10b065f2
[clang] Pass the NamedDecl* instead of the DeclarationName into many diagnostics.
Background:
-----------
There are two related argument types which can be sent into a diagnostic to
display the name of an entity: DeclarationName (ak_declarationname) or
NamedDecl* (ak_nameddecl) (there is also ak_identifierinfo for
IdentifierInfo*, but we are not concerned with it here).

A DeclarationName in a diagnostic will just be streamed to the output,
which will directly result in a call to DeclarationName::print.

A NamedDecl* in a diagnostic will also ultimately result in a call to
DeclarationName::print, but with two customisation points along the way:

The first customisation point is NamedDecl::getNameForDiagnostic which is
overloaded by FunctionDecl, ClassTemplateSpecializationDecl and
VarTemplateSpecializationDecl to print the template arguments, if any.

The second customisation point is NamedDecl::printName. By default it just
streams the stored DeclarationName into the output but it can be customised
to provide a user-friendly name for an entity. It is currently overloaded by
DecompositionDecl and MSGuidDecl.

What this patch does:
---------------------
For many diagnostics a DeclarationName is used instead of the NamedDecl*.
This bypasses the two customisation points mentioned above. This patches fix
this for diagnostics in Sema.cpp, SemaCast.cpp, SemaChecking.cpp, SemaDecl.cpp,
SemaDeclAttr.cpp, SemaDecl.cpp, SemaOverload.cpp and SemaStmt.cpp.

I have only modified diagnostics where I could construct a test-case which
demonstrates that the change is appropriate (either with this patch or the next
one).

Reviewed By: erichkeane, aaron.ballman

Differential Revision: https://reviews.llvm.org/D84656
2020-07-28 10:30:35 +01:00

64 lines
1.0 KiB
C++

// RUN: %clang_cc1 -fsyntax-only -verify -Wall %s
namespace test1 {
static void f() {} // expected-warning {{function 'f' is not needed and will not be emitted}}
static void f();
template <typename T>
void foo() {
f();
}
}
namespace test1_template {
template <typename T> static void f() {}
template <> void f<int>() {} // expected-warning {{function 'f<int>' is not needed and will not be emitted}}
template <typename T>
void foo() {
f<int>();
f<long>();
}
} // namespace test1_template
namespace test2 {
static void f() {}
static void f();
static void g() { f(); }
void h() { g(); }
}
namespace test3 {
static void f();
template<typename T>
static void g() {
f();
}
static void f() {
}
void h() {
g<int>();
}
}
namespace test4 {
static void f();
static void f();
template<typename T>
static void g() {
f();
}
static void f() {
}
void h() {
g<int>();
}
}
namespace test4 {
static void func();
void bar() {
void func();
func();
}
static void func() {}
}