Original commit message:
Provide -Wnull-conversion separately from -Wconversion.
Like GCC, provide a NULL conversion to non-pointer conversion as a separate
flag, on by default. GCC's flag is "conversion-null" which we provide for
cross compatibility, but in the interests of consistency (with
-Wint-conversion, -Wbool-conversion, etc) the canonical Clang flag is called
-Wnull-conversion.
Patch by Lubos Lunak.
Review feedback by myself, Chandler Carruth, and Chad Rosier.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@152774
91177308-0d34-0410-b5e6-
96231b3b80d8
def AutoImport : DiagGroup<"auto-import">;
def BoolConversions : DiagGroup<"bool-conversions">;
def IntConversions : DiagGroup<"int-conversions">;
+def NullConversion : DiagGroup<"null-conversion">;
def BuiltinRequiresHeader : DiagGroup<"builtin-requires-header">;
def CXXCompat: DiagGroup<"c++-compat">;
def CastAlign : DiagGroup<"cast-align">;
// - conversion warnings with constant sources are on by default
// - conversion warnings for literals are on by default
// - bool-to-pointer conversion warnings are on by default
+// - __null-to-integer conversion warnings are on by default
def Conversion : DiagGroup<"conversion",
[DiagGroup<"shorten-64-to-32">,
DiagGroup<"constant-conversion">,
DiagGroup<"string-conversion">,
DiagGroup<"sign-conversion">,
BoolConversions,
+ NullConversion,
IntConversions]>,
DiagCategory<"Value Conversion Issue">;
def : DiagGroup<"", [Extra]>; // -W = -Wextra
def : DiagGroup<"endif-labels", [ExtraTokens]>; // -Wendif-labels=-Wendif-tokens
def : DiagGroup<"comments", [Comment]>; // -Wcomments = -Wcomment
+def : DiagGroup<"conversion-null",
+ [NullConversion]>; // -Wconversion-null = -Wnull-conversion
+
// A warning group for warnings that we want to have on by default in clang,
// but which aren't on by default in GCC.
"expression">, InGroup<BoolConversions>;
def warn_impcast_null_pointer_to_integer : Warning<
"implicit conversion of NULL constant to integer">,
- InGroup<DiagGroup<"conversion">>, DefaultIgnore;
+ InGroup<NullConversion>;
def warn_impcast_function_to_bool : Warning<
"address of function %q0 will always evaluate to 'true'">,
InGroup<BoolConversions>;
.Case("c++11-narrowing", true)
.Case("conditional-uninitialized", true)
.Case("constant-conversion", true)
+ .Case("conversion-null", true)
.Case("CFString-literal", true)
.Case("constant-logical-operand", true)
.Case("custom-atomic-properties", true)
-// RUN: %clang_cc1 -std=c++11 -analyze -analyzer-checker=core -analyzer-store region -verify %s
+// RUN: %clang_cc1 -std=c++11 -Wno-conversion-null -analyze -analyzer-checker=core -analyzer-store region -verify %s
// test to see if nullptr is detected as a null pointer
void foo1(void) {
-// RUN: %clang_cc1 -triple x86_64-unknown-unknown %s -fsyntax-only -verify
-// RUN: %clang_cc1 -triple i686-unknown-unknown %s -fsyntax-only -verify
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown %s -Wno-null-conversion -fsyntax-only -verify
+// RUN: %clang_cc1 -triple i686-unknown-unknown %s -Wno-null-conversion -fsyntax-only -verify
void f() {
int* i = __null;
};
}
+// This file tests -Wnull-conversion, a subcategory of -Wconversion
+// which is on by default.
+
void test3() {
int a = NULL; // expected-warning {{implicit conversion of NULL constant to integer}}
int b;
b = NULL; // expected-warning {{implicit conversion of NULL constant to integer}}
+ long l = NULL; // FIXME: this should also warn, but currently does not if sizeof(NULL)==sizeof(inttype)
int c = ((((NULL)))); // expected-warning {{implicit conversion of NULL constant to integer}}
int d;
d = ((((NULL)))); // expected-warning {{implicit conversion of NULL constant to integer}}