forked from OSchip/llvm-project
189 lines
6.0 KiB
C++
189 lines
6.0 KiB
C++
// RUN: %check_clang_tidy %s abseil-redundant-strcat-calls %t
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int strlen(const char *);
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// Here we mimic the hierarchy of ::string.
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// We need to do so because we are matching on the fully qualified name of the
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// methods.
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struct __sso_string_base {};
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namespace __gnu_cxx {
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template <typename A, typename B, typename C, typename D = __sso_string_base>
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class __versa_string {
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public:
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const char *c_str() const;
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const char *data() const;
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int size() const;
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int capacity() const;
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int length() const;
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bool empty() const;
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char &operator[](int);
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void clear();
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void resize(int);
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int compare(const __versa_string &) const;
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};
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} // namespace __gnu_cxx
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namespace std {
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template <typename T>
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class char_traits {};
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template <typename T>
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class allocator {};
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} // namespace std
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template <typename A, typename B = std::char_traits<A>,
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typename C = std::allocator<A>>
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class basic_string : public __gnu_cxx::__versa_string<A, B, C> {
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public:
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basic_string();
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basic_string(const basic_string &);
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basic_string(const char *, C = C());
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basic_string(const char *, int, C = C());
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basic_string(const basic_string &, int, int, C = C());
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~basic_string();
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basic_string &operator+=(const basic_string &);
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};
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template <typename A, typename B, typename C>
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basic_string<A, B, C> operator+(const basic_string<A, B, C> &,
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const basic_string<A, B, C> &);
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template <typename A, typename B, typename C>
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basic_string<A, B, C> operator+(const basic_string<A, B, C> &, const char *);
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typedef basic_string<char> string;
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bool operator==(const string &, const string &);
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bool operator==(const string &, const char *);
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bool operator==(const char *, const string &);
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bool operator!=(const string &, const string &);
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bool operator<(const string &, const string &);
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bool operator>(const string &, const string &);
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bool operator<=(const string &, const string &);
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bool operator>=(const string &, const string &);
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namespace std {
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template <typename _CharT, typename _Traits = char_traits<_CharT>,
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typename _Alloc = allocator<_CharT>>
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class basic_string;
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template <typename _CharT, typename _Traits, typename _Alloc>
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class basic_string {
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public:
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basic_string();
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basic_string(const basic_string &);
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basic_string(const char *, const _Alloc & = _Alloc());
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basic_string(const char *, int, const _Alloc & = _Alloc());
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basic_string(const basic_string &, int, int, const _Alloc & = _Alloc());
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~basic_string();
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basic_string &operator+=(const basic_string &);
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unsigned size() const;
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unsigned length() const;
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bool empty() const;
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};
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typedef basic_string<char> string;
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} // namespace std
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namespace absl {
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class string_view {
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public:
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typedef std::char_traits<char> traits_type;
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string_view();
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string_view(const char *);
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string_view(const string &);
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string_view(const char *, int);
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string_view(string_view, int);
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template <typename A>
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explicit operator ::basic_string<char, traits_type, A>() const;
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const char *data() const;
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int size() const;
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int length() const;
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};
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bool operator==(string_view A, string_view B);
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struct AlphaNum {
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AlphaNum(int i);
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AlphaNum(double f);
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AlphaNum(const char *c_str);
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AlphaNum(const string &str);
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AlphaNum(const string_view &pc);
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private:
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AlphaNum(const AlphaNum &);
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AlphaNum &operator=(const AlphaNum &);
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};
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string StrCat(const AlphaNum &A);
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string StrCat(const AlphaNum &A, const AlphaNum &B);
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string StrCat(const AlphaNum &A, const AlphaNum &B, const AlphaNum &C);
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string StrCat(const AlphaNum &A, const AlphaNum &B, const AlphaNum &C,
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const AlphaNum &D);
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// Support 5 or more arguments
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template <typename... AV>
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string StrCat(const AlphaNum &A, const AlphaNum &B, const AlphaNum &C,
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const AlphaNum &D, const AlphaNum &E, const AV &... args);
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void StrAppend(string *Dest, const AlphaNum &A);
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void StrAppend(string *Dest, const AlphaNum &A, const AlphaNum &B);
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void StrAppend(string *Dest, const AlphaNum &A, const AlphaNum &B,
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const AlphaNum &C);
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void StrAppend(string *Dest, const AlphaNum &A, const AlphaNum &B,
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const AlphaNum &C, const AlphaNum &D);
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// Support 5 or more arguments
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template <typename... AV>
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void StrAppend(string *Dest, const AlphaNum &A, const AlphaNum &B,
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const AlphaNum &C, const AlphaNum &D, const AlphaNum &E,
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const AV &... args);
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} // namespace absl
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using absl::AlphaNum;
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using absl::StrAppend;
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using absl::StrCat;
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void Positives() {
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string S = StrCat(1, StrCat("A", StrCat(1.1)));
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// CHECK-MESSAGES: [[@LINE-1]]:14: warning: multiple calls to 'absl::StrCat' can be flattened into a single call
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S = StrCat(StrCat(StrCat(StrCat(StrCat(1)))));
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// CHECK-MESSAGES: [[@LINE-1]]:7: warning: multiple calls to 'absl::StrCat' can be flattened into a single call
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// TODO: should trigger. The issue here is that in the current
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// implementation we ignore any StrCat with StrCat ancestors. Therefore
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// inserting anything in between calls will disable triggering the deepest
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// ones.
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// s = StrCat(Identity(StrCat(StrCat(1, 2), StrCat(3, 4))));
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StrAppend(&S, 001, StrCat(1, 2, "3"), StrCat("FOO"));
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// CHECK-MESSAGES: [[@LINE-1]]:3: warning: multiple calls to 'absl::StrCat' can be flattened into a single call
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StrAppend(&S, 001, StrCat(StrCat(1, 2), "3"), StrCat("FOO"));
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// CHECK-MESSAGES: [[@LINE-1]]:3: warning: multiple calls to 'absl::StrCat' can be flattened into a single call
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// Too many args. Ignore for now.
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S = StrCat(1, 2, StrCat(3, 4, 5, 6, 7), 8, 9, 10,
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StrCat(11, 12, 13, 14, 15, 16, 17, 18), 19, 20, 21, 22, 23, 24, 25,
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26, 27);
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// CHECK-MESSAGES: :[[@LINE-3]]:7: warning: multiple calls to 'absl::StrCat' can be flattened into a single call
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StrAppend(&S, StrCat(1, 2, 3, 4, 5), StrCat(6, 7, 8, 9, 10));
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// CHECK-MESSAGES: :[[@LINE-1]]:3: warning: multiple calls to 'absl::StrCat' can be flattened into a single call
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}
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void Negatives() {
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// One arg. It is used for conversion. Ignore.
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string S = StrCat(1);
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#define A_MACRO(x, y, z) StrCat(x, y, z)
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S = A_MACRO(1, 2, StrCat("A", "B"));
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}
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