1// RUN: %check_clang_tidy %s llvmlibc-callee-namespace %t
2
3#define OTHER_MACRO_NAMESPACE custom_namespace
4namespace OTHER_MACRO_NAMESPACE {
5 void wrong_name_macro_func() {}
6}
7
8namespace __llvm_libc {
9 void right_name_no_macro_func() {}
10}
11
12#define LIBC_NAMESPACE __llvm_libc_xyz
13namespace LIBC_NAMESPACE {
14namespace nested {
15void nested_func() {}
16} // namespace nested
17void libc_api_func() {}
18
19struct libc_api_struct {
20 int operator()() const { return 0; }
21};
22} // namespace __llvm_libc
23
24// Emulate a function from the public headers like string.h
25void libc_api_func() {}
26
27// Emulate a function specifically allowed by the exception list.
28void malloc() {}
29
30// Emulate a non-trivially named symbol.
31struct global_struct {
32 int operator()() const { return 0; }
33};
34
35namespace LIBC_NAMESPACE {
36void Test() {
37 // Allow calls with the fully qualified name.
38 LIBC_NAMESPACE::libc_api_func();
39 LIBC_NAMESPACE::nested::nested_func();
40 void (*qualifiedPtr)(void) = LIBC_NAMESPACE::libc_api_func;
41 qualifiedPtr();
42
43 // Should not trigger on compiler provided function calls.
44 (void)__builtin_abs(-1);
45
46 // Bare calls are allowed as long as they resolve to the correct namespace.
47 libc_api_func();
48 nested::nested_func();
49 void (*barePtr)(void) = LIBC_NAMESPACE::libc_api_func;
50 barePtr();
51
52 // Allow calling entities defined in the namespace.
53 LIBC_NAMESPACE::libc_api_struct{}();
54
55 // Disallow calling into global namespace for implemented entrypoints.
56 ::libc_api_func();
57 // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: 'libc_api_func' must resolve to a function declared within the namespace defined by the 'LIBC_NAMESPACE' macro
58 // CHECK-MESSAGES: :25:6: note: resolves to this declaration
59
60 // Disallow indirect references to functions in global namespace.
61 void (*badPtr)(void) = ::libc_api_func;
62 badPtr();
63 // CHECK-MESSAGES: :[[@LINE-2]]:26: warning: 'libc_api_func' must resolve to a function declared within the namespace defined by the 'LIBC_NAMESPACE' macro
64 // CHECK-MESSAGES: :25:6: note: resolves to this declaration
65
66 // Allow calling into global namespace for specific functions.
67 ::malloc();
68
69 // Disallow calling on entities that are not in the namespace, but make sure
70 // no crashes happen.
71 global_struct{}();
72 // CHECK-MESSAGES: :[[@LINE-1]]:18: warning: 'operator()' must resolve to a function declared within the namespace defined by the 'LIBC_NAMESPACE' macro
73 // CHECK-MESSAGES: :32:7: note: resolves to this declaration
74
75 OTHER_MACRO_NAMESPACE::wrong_name_macro_func();
76 // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: 'wrong_name_macro_func' must resolve to a function declared within the namespace defined by the 'LIBC_NAMESPACE' macro
77 // CHECK-MESSAGES: :3:31: note: expanded from macro 'OTHER_MACRO_NAMESPACE'
78 // CHECK-MESSAGES: :5:8: note: resolves to this declaration
79
80 __llvm_libc::right_name_no_macro_func();
81 // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: 'right_name_no_macro_func' must resolve to a function declared within the namespace defined by the 'LIBC_NAMESPACE' macro
82 // CHECK-MESSAGES: :9:8: note: resolves to this declaration
83
84}
85
86} // namespace __llvm_libc
87

source code of clang-tools-extra/test/clang-tidy/checkers/llvmlibc/callee-namespace.cpp