https://github.com/kelbon updated
https://github.com/llvm/llvm-project/pull/78200
>From e8c799b54c3e0b8088dbc19aaac0ef066baf136e Mon Sep 17 00:00:00 2001
From: Kelbon Nik <kelbon...@gmail.com>
Date: Mon, 15 Jan 2024 22:24:34 +0400
Subject: [PATCH 1/5] add warning and test
---
clang/include/clang/Basic/DiagnosticGroups.td | 1 +
clang/include/clang/Basic/DiagnosticSemaKinds.td | 7 +++++++
clang/lib/Sema/SemaDecl.cpp | 7 +++++++
clang/test/Sema/incorrect_pure.cpp | 7 +++++++
4 files changed, 22 insertions(+)
create mode 100644 clang/test/Sema/incorrect_pure.cpp
diff --git a/clang/include/clang/Basic/DiagnosticGroups.td
b/clang/include/clang/Basic/DiagnosticGroups.td
index 6765721ae7002c..9fcf2be2e45458 100644
--- a/clang/include/clang/Basic/DiagnosticGroups.td
+++ b/clang/include/clang/Basic/DiagnosticGroups.td
@@ -414,6 +414,7 @@ def : DiagGroup<"c++2a-compat", [CXX20Compat]>;
def : DiagGroup<"c++2a-compat-pedantic", [CXX20CompatPedantic]>;
def ExitTimeDestructors : DiagGroup<"exit-time-destructors">;
+def IncorrectAttributeUsage : DiagGroup<"incorrect-attribute-usage">;
def FlexibleArrayExtensions : DiagGroup<"flexible-array-extensions">;
def FourByteMultiChar : DiagGroup<"four-char-constants">;
def GlobalConstructors : DiagGroup<"global-constructors"> {
diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td
b/clang/include/clang/Basic/DiagnosticSemaKinds.td
index 03b0122d1c08f7..1df075119a482f 100644
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -692,6 +692,13 @@ def warn_maybe_falloff_nonvoid_function : Warning<
def warn_falloff_nonvoid_function : Warning<
"non-void function does not return a value">,
InGroup<ReturnType>;
+def warn_pure_attr_on_cxx_constructor : Warning<
+ "constructor cannot be 'pure' (undefined behavior)">,
+ InGroup<IncorrectAttributeUsage>;
+def warn_pure_function_returns_void : Warning<
+ "'pure' attribute on function returning 'void'">,
+ InGroup<IncorrectAttributeUsage>;
+
def err_maybe_falloff_nonvoid_block : Error<
"non-void block does not return a value in all control paths">;
def err_falloff_nonvoid_block : Error<
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index dae98f3a7406e8..86dc022fbe055d 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -11899,6 +11899,13 @@ bool Sema::CheckFunctionDeclaration(Scope *S,
FunctionDecl *NewFD,
NewFD->setInvalidDecl();
}
+ if (NewFD->hasAttr<PureAttr>() || NewFD->hasAttr<ConstAttr>()) {
+ if (isa<CXXConstructorDecl>(NewFD))
+ Diag(NewFD->getLocation(), diag::warn_pure_attr_on_cxx_constructor);
+ else if (NewFD->getReturnType()->isVoidType())
+ Diag(NewFD->getLocation(), diag::warn_pure_function_returns_void);
+ }
+
// C++11 [dcl.constexpr]p8:
// A constexpr specifier for a non-static member function that is not
// a constructor declares that member function to be const.
diff --git a/clang/test/Sema/incorrect_pure.cpp
b/clang/test/Sema/incorrect_pure.cpp
new file mode 100644
index 00000000000000..ce02309f086386
--- /dev/null
+++ b/clang/test/Sema/incorrect_pure.cpp
@@ -0,0 +1,7 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+[[gnu::pure]] void foo(); // expected-warning{{'pure' attribute on function
returning 'void'}}
+
+struct A {
+ [[gnu::pure]] A(); // expected-warning{{constructor cannot be 'pure'
(undefined behavior)}}
+};
>From d152fa4881d6052bfad33c922f276d4909c305ec Mon Sep 17 00:00:00 2001
From: Kelbon Nik <kelbon...@gmail.com>
Date: Tue, 16 Jan 2024 00:03:47 +0400
Subject: [PATCH 2/5] fix old incorrect test
---
clang/test/Analysis/call-invalidation.cpp | 8 ++++----
clang/test/CodeGen/pragma-weak.c | 6 +++---
clang/test/Interpreter/disambiguate-decl-stmt.cpp | 4 ++--
clang/test/SemaCXX/cxx0x-cursory-default-delete.cpp | 2 +-
clang/test/SemaCXX/warn-unused-value-cxx11.cpp | 2 +-
5 files changed, 11 insertions(+), 11 deletions(-)
diff --git a/clang/test/Analysis/call-invalidation.cpp
b/clang/test/Analysis/call-invalidation.cpp
index ef6505e19cf803..727217f228b054 100644
--- a/clang/test/Analysis/call-invalidation.cpp
+++ b/clang/test/Analysis/call-invalidation.cpp
@@ -90,8 +90,8 @@ void testConstReferenceStruct() {
}
-void usePointerPure(int * const *) __attribute__((pure));
-void usePointerConst(int * const *) __attribute__((const));
+int usePointerPure(int * const *) __attribute__((pure));
+int usePointerConst(int * const *) __attribute__((const));
void testPureConst() {
extern int global;
@@ -104,11 +104,11 @@ void testPureConst() {
clang_analyzer_eval(x == 42); // expected-warning{{TRUE}}
clang_analyzer_eval(global == -5); // expected-warning{{TRUE}}
- usePointerPure(&p);
+ (void)usePointerPure(&p);
clang_analyzer_eval(x == 42); // expected-warning{{TRUE}}
clang_analyzer_eval(global == -5); // expected-warning{{TRUE}}
- usePointerConst(&p);
+ (void)usePointerConst(&p);
clang_analyzer_eval(x == 42); // expected-warning{{TRUE}}
clang_analyzer_eval(global == -5); // expected-warning{{TRUE}}
diff --git a/clang/test/CodeGen/pragma-weak.c b/clang/test/CodeGen/pragma-weak.c
index 52328bf9ff1be7..d4011628bda7f1 100644
--- a/clang/test/CodeGen/pragma-weak.c
+++ b/clang/test/CodeGen/pragma-weak.c
@@ -16,7 +16,7 @@
// CHECK-DAG: @declfirstattr = weak{{.*}} alias void (), ptr @__declfirstattr
// CHECK-DAG: @mix2 = weak{{.*}} alias void (), ptr @__mix2
// CHECK-DAG: @a1 = weak{{.*}} alias void (), ptr @__a1
-// CHECK-DAG: @xxx = weak{{.*}} alias void (), ptr @__xxx
+// CHECK-DAG: @xxx = weak{{.*}} alias int (), ptr @__xxx
// CHECK-DAG: @undecfunc_alias1 = weak{{.*}} alias void (), ptr @undecfunc
// CHECK-DAG: @undecfunc_alias2 = weak{{.*}} alias void (), ptr @undecfunc
// CHECK-DAG: @undecfunc_alias3 = weak{{.*}} alias void (), ptr @undecfunc
@@ -137,8 +137,8 @@ void __a1(void) {}
// CHECK: define{{.*}} void @__a1() [[NI:#[0-9]+]]
#pragma weak xxx = __xxx
-__attribute((pure,noinline,const)) void __xxx(void) { }
-// CHECK: void @__xxx() [[RN:#[0-9]+]]
+__attribute((pure,noinline,const)) int __xxx(void) { return 0; }
+// CHECK: int @__xxx() [[RN:#[0-9]+]]
///////////// PR28611: Try multiple aliases of same undeclared symbol or alias
#pragma weak undecfunc_alias1 = undecfunc
diff --git a/clang/test/Interpreter/disambiguate-decl-stmt.cpp
b/clang/test/Interpreter/disambiguate-decl-stmt.cpp
index a49d7013c540ac..1f4d5e267288bc 100644
--- a/clang/test/Interpreter/disambiguate-decl-stmt.cpp
+++ b/clang/test/Interpreter/disambiguate-decl-stmt.cpp
@@ -95,10 +95,10 @@ Ns::Ns::Fs();
Ns::Ns::Ns();
struct Attrs1 { Attrs1(); };
-Attrs1::Attrs1() __attribute((pure)) = default;
+Attrs1::Attrs1() __attribute((noreturn)) = default;
struct Attrs2 { Attrs2(); };
-__attribute((pure)) Attrs2::Attrs2() = default;
+__attribute((noreturn)) Attrs2::Attrs2() = default;
// Extra semicolon
namespace N {};
diff --git a/clang/test/SemaCXX/cxx0x-cursory-default-delete.cpp
b/clang/test/SemaCXX/cxx0x-cursory-default-delete.cpp
index 9d68a0e5d358f6..6ae146f0d08c7d 100644
--- a/clang/test/SemaCXX/cxx0x-cursory-default-delete.cpp
+++ b/clang/test/SemaCXX/cxx0x-cursory-default-delete.cpp
@@ -194,7 +194,7 @@ struct except_spec_d_match : except_spec_a, except_spec_b {
// gcc-compatibility: allow attributes on default definitions
// (but not normal definitions)
struct S { S(); };
-S::S() __attribute((pure)) = default;
+S::S() __attribute((noreturn)) = default;
using size_t = decltype(sizeof(0));
void *operator new(size_t) = delete; // expected-error {{deleted definition
must be first declaration}} expected-note {{implicit}}
diff --git a/clang/test/SemaCXX/warn-unused-value-cxx11.cpp
b/clang/test/SemaCXX/warn-unused-value-cxx11.cpp
index a6f41c3fd6b3b2..687278a98f4e1a 100644
--- a/clang/test/SemaCXX/warn-unused-value-cxx11.cpp
+++ b/clang/test/SemaCXX/warn-unused-value-cxx11.cpp
@@ -1,6 +1,6 @@
// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify -Wunused-value %s
-void f() __attribute__((const));
+int f() __attribute__((const));
namespace PR18571 {
// Unevaluated contexts should not trigger unused result warnings.
>From 58e264511cd8b2f2eb20bb23ec797d8dadd5ac19 Mon Sep 17 00:00:00 2001
From: Kelbon Nik <kelbon...@gmail.com>
Date: Wed, 17 Jan 2024 15:00:39 +0400
Subject: [PATCH 3/5] release notes, update warning message, handle pure &&
const declarations
---
clang/docs/ReleaseNotes.rst | 2 +-
clang/include/clang/Basic/DiagnosticGroups.td | 1 -
.../clang/Basic/DiagnosticSemaKinds.td | 10 +++----
clang/lib/Sema/SemaDecl.cpp | 27 ++++++++++++++-----
clang/test/CodeGen/pragma-weak.c | 6 ++---
clang/test/Sema/attr-print.c | 8 +++---
clang/test/Sema/incorrect_pure.cpp | 11 ++++++--
7 files changed, 43 insertions(+), 22 deletions(-)
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index d63781cf8b11bf..e929852b0994a1 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -569,7 +569,7 @@ Improvements to Clang's diagnostics
and template friend declarations with a constraint that depends on a
template parameter from an
enclosing template must be a definition.
- Clang now diagnoses function/variable templates that shadow their own
template parameters, e.g. ``template<class T> void T();``.
-
+- Clang now diagnoses incorrect usage of ``const`` and ``pure`` attributes, so
``-Wignored-attributes`` diagnoses more cases.
Improvements to Clang's time-trace
----------------------------------
diff --git a/clang/include/clang/Basic/DiagnosticGroups.td
b/clang/include/clang/Basic/DiagnosticGroups.td
index 9fcf2be2e45458..6765721ae7002c 100644
--- a/clang/include/clang/Basic/DiagnosticGroups.td
+++ b/clang/include/clang/Basic/DiagnosticGroups.td
@@ -414,7 +414,6 @@ def : DiagGroup<"c++2a-compat", [CXX20Compat]>;
def : DiagGroup<"c++2a-compat-pedantic", [CXX20CompatPedantic]>;
def ExitTimeDestructors : DiagGroup<"exit-time-destructors">;
-def IncorrectAttributeUsage : DiagGroup<"incorrect-attribute-usage">;
def FlexibleArrayExtensions : DiagGroup<"flexible-array-extensions">;
def FourByteMultiChar : DiagGroup<"four-char-constants">;
def GlobalConstructors : DiagGroup<"global-constructors"> {
diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td
b/clang/include/clang/Basic/DiagnosticSemaKinds.td
index 1df075119a482f..ee74a8211c34af 100644
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -692,12 +692,12 @@ def warn_maybe_falloff_nonvoid_function : Warning<
def warn_falloff_nonvoid_function : Warning<
"non-void function does not return a value">,
InGroup<ReturnType>;
-def warn_pure_attr_on_cxx_constructor : Warning<
- "constructor cannot be 'pure' (undefined behavior)">,
- InGroup<IncorrectAttributeUsage>;
+def warn_const_attr_with_pure_attr : Warning<
+ "'const' attribute imposes more restrictions, 'pure' attribute ignored">,
+ InGroup<IgnoredAttributes>;
def warn_pure_function_returns_void : Warning<
- "'pure' attribute on function returning 'void'">,
- InGroup<IncorrectAttributeUsage>;
+ "'%select{pure|const}0' attribute on function returning 'void', attribute
ignored">,
+ InGroup<IgnoredAttributes>;
def err_maybe_falloff_nonvoid_block : Error<
"non-void block does not return a value in all control paths">;
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 86dc022fbe055d..5b35783a268948 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -11802,6 +11802,26 @@ static bool CheckMultiVersionFunction(Sema &S,
FunctionDecl *NewFD,
OldDecl, Previous);
}
+static void CheckFunctionDeclarationAttributesUsage(Sema &S,
+ FunctionDecl *NewFD) {
+ bool IsPure = NewFD->hasAttr<PureAttr>();
+ bool IsConst = NewFD->hasAttr<ConstAttr>();
+
+ if (IsPure && IsConst) {
+ S.Diag(NewFD->getLocation(), diag::warn_const_attr_with_pure_attr);
+ NewFD->dropAttr<PureAttr>();
+ }
+ if (IsPure || IsConst) {
+ // Constructors and destructors are functions which return void, so are
handled here as well.
+ if (NewFD->getReturnType()->isVoidType()) {
+ S.Diag(NewFD->getLocation(), diag::warn_pure_function_returns_void)
+ << IsConst;
+ NewFD->dropAttr<PureAttr>();
+ NewFD->dropAttr<ConstAttr>();
+ }
+ }
+}
+
/// Perform semantic checking of a new function declaration.
///
/// Performs semantic analysis of the new function declaration
@@ -11899,12 +11919,7 @@ bool Sema::CheckFunctionDeclaration(Scope *S,
FunctionDecl *NewFD,
NewFD->setInvalidDecl();
}
- if (NewFD->hasAttr<PureAttr>() || NewFD->hasAttr<ConstAttr>()) {
- if (isa<CXXConstructorDecl>(NewFD))
- Diag(NewFD->getLocation(), diag::warn_pure_attr_on_cxx_constructor);
- else if (NewFD->getReturnType()->isVoidType())
- Diag(NewFD->getLocation(), diag::warn_pure_function_returns_void);
- }
+ CheckFunctionDeclarationAttributesUsage(*this, NewFD);
// C++11 [dcl.constexpr]p8:
// A constexpr specifier for a non-static member function that is not
diff --git a/clang/test/CodeGen/pragma-weak.c b/clang/test/CodeGen/pragma-weak.c
index d4011628bda7f1..ea508a485ef612 100644
--- a/clang/test/CodeGen/pragma-weak.c
+++ b/clang/test/CodeGen/pragma-weak.c
@@ -16,7 +16,7 @@
// CHECK-DAG: @declfirstattr = weak{{.*}} alias void (), ptr @__declfirstattr
// CHECK-DAG: @mix2 = weak{{.*}} alias void (), ptr @__mix2
// CHECK-DAG: @a1 = weak{{.*}} alias void (), ptr @__a1
-// CHECK-DAG: @xxx = weak{{.*}} alias int (), ptr @__xxx
+// CHECK-DAG: @xxx = weak{{.*}} alias i32 (), ptr @__xxx
// CHECK-DAG: @undecfunc_alias1 = weak{{.*}} alias void (), ptr @undecfunc
// CHECK-DAG: @undecfunc_alias2 = weak{{.*}} alias void (), ptr @undecfunc
// CHECK-DAG: @undecfunc_alias3 = weak{{.*}} alias void (), ptr @undecfunc
@@ -137,8 +137,8 @@ void __a1(void) {}
// CHECK: define{{.*}} void @__a1() [[NI:#[0-9]+]]
#pragma weak xxx = __xxx
-__attribute((pure,noinline,const)) int __xxx(void) { return 0; }
-// CHECK: int @__xxx() [[RN:#[0-9]+]]
+__attribute((noinline,const)) int __xxx(void) { return 0; }
+// CHECK: i32 @__xxx() [[RN:#[0-9]+]]
///////////// PR28611: Try multiple aliases of same undeclared symbol or alias
#pragma weak undecfunc_alias1 = undecfunc
diff --git a/clang/test/Sema/attr-print.c b/clang/test/Sema/attr-print.c
index ffa27de4a5d306..8492356e5d2e57 100644
--- a/clang/test/Sema/attr-print.c
+++ b/clang/test/Sema/attr-print.c
@@ -9,11 +9,11 @@ __declspec(align(4)) int y;
// CHECK: short arr[3] __attribute__((aligned));
short arr[3] __attribute__((aligned));
-// CHECK: void foo(void) __attribute__((const));
-void foo(void) __attribute__((const));
+// CHECK: int foo(void) __attribute__((const));
+int foo(void) __attribute__((const));
-// CHECK: void bar(void) __attribute__((__const));
-void bar(void) __attribute__((__const));
+// CHECK: int bar(void) __attribute__((__const));
+int bar(void) __attribute__((__const));
// CHECK: int * __ptr32 p32;
int * __ptr32 p32;
diff --git a/clang/test/Sema/incorrect_pure.cpp
b/clang/test/Sema/incorrect_pure.cpp
index ce02309f086386..1fa17785ec3880 100644
--- a/clang/test/Sema/incorrect_pure.cpp
+++ b/clang/test/Sema/incorrect_pure.cpp
@@ -1,7 +1,14 @@
// RUN: %clang_cc1 -fsyntax-only -verify %s
-[[gnu::pure]] void foo(); // expected-warning{{'pure' attribute on function
returning 'void'}}
+[[gnu::pure]] void foo(); // expected-warning{{'pure' attribute on function
returning 'void', attribute ignored}}
+
+[[gnu::const]] void bar(); // expected-warning{{'const' attribute on function
returning 'void', attribute ignored}}
struct A {
- [[gnu::pure]] A(); // expected-warning{{constructor cannot be 'pure'
(undefined behavior)}}
+ [[gnu::pure]] A(); // expected-warning{{'pure' attribute on function
returning 'void', attribute ignored}}
+
+ [[gnu::const]] A(int); // expected-warning{{'const' attribute on function
returning 'void', attribute ignored}}
+ [[gnu::pure]] ~A(); // expected-warning{{'pure' attribute on function
returning 'void', attribute ignored}}
+
+ [[gnu::const]] [[gnu::pure]] int m(); // expected-warning{{'const'
attribute imposes more restrictions, 'pure' attribute ignored}}
};
>From f52fa936035a10cfe852b8a52b47a68138c2e4d9 Mon Sep 17 00:00:00 2001
From: Kelbon Nik <kelbon...@gmail.com>
Date: Wed, 17 Jan 2024 22:12:22 +0400
Subject: [PATCH 4/5] format
---
clang/lib/Sema/SemaDecl.cpp | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index 5b35783a268948..53a57e13a05732 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -11812,7 +11812,8 @@ static void
CheckFunctionDeclarationAttributesUsage(Sema &S,
NewFD->dropAttr<PureAttr>();
}
if (IsPure || IsConst) {
- // Constructors and destructors are functions which return void, so are
handled here as well.
+ // Constructors and destructors are functions which return void, so are
+ // handled here as well.
if (NewFD->getReturnType()->isVoidType()) {
S.Diag(NewFD->getLocation(), diag::warn_pure_function_returns_void)
<< IsConst;
>From 712950f0fa8bb669ebb71b5c30b159f509619144 Mon Sep 17 00:00:00 2001
From: Kelbon Nik <kelbon...@gmail.com>
Date: Wed, 17 Jan 2024 22:56:51 +0400
Subject: [PATCH 5/5] fix old tests
---
clang/test/SemaCXX/attr-print.cpp | 12 ++++++------
clang/test/SemaCXX/cxx11-attr-print.cpp | 8 ++++----
2 files changed, 10 insertions(+), 10 deletions(-)
diff --git a/clang/test/SemaCXX/attr-print.cpp
b/clang/test/SemaCXX/attr-print.cpp
index dff290be696be2..c7c58a25504eed 100644
--- a/clang/test/SemaCXX/attr-print.cpp
+++ b/clang/test/SemaCXX/attr-print.cpp
@@ -6,15 +6,15 @@ int x __attribute__((aligned(4)));
// CHECK: __declspec(align(4)) int y;
__declspec(align(4)) int y;
-// CHECK: void foo() __attribute__((const));
-void foo() __attribute__((const));
+// CHECK: int foo() __attribute__((const));
+int foo() __attribute__((const));
-// CHECK: void bar() __attribute__((__const));
-void bar() __attribute__((__const));
+// CHECK: int bar() __attribute__((__const));
+int bar() __attribute__((__const));
// FIXME: Print this with correct format.
-// CHECK: void foo1() __attribute__((noinline)) __attribute__((pure));
-void foo1() __attribute__((noinline, pure));
+// CHECK: int foo1() __attribute__((noinline)) __attribute__((pure));
+int foo1() __attribute__((noinline, pure));
// CHECK: typedef int Small1 __attribute__((mode(byte)));
typedef int Small1 __attribute__((mode(byte)));
diff --git a/clang/test/SemaCXX/cxx11-attr-print.cpp
b/clang/test/SemaCXX/cxx11-attr-print.cpp
index 7095c462031d93..c988972aeb1a5a 100644
--- a/clang/test/SemaCXX/cxx11-attr-print.cpp
+++ b/clang/test/SemaCXX/cxx11-attr-print.cpp
@@ -30,11 +30,11 @@ alignas(4) int cxx11_alignas;
// CHECK: int c11_alignas _Alignas(int);
_Alignas(int) int c11_alignas;
-// CHECK: void foo() __attribute__((const));
-void foo() __attribute__((const));
+// CHECK: int foo() __attribute__((const));
+int foo() __attribute__((const));
-// CHECK: void bar() __attribute__((__const));
-void bar() __attribute__((__const));
+// CHECK: int bar() __attribute__((__const));
+int bar() __attribute__((__const));
// FIXME: It's unfortunate that the string literal prints with the below three
// cases given that the string is only exposed via the [[nodiscard]] spelling.
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