Summary:
std::string::data() and std::string::c_str() are equivalent.
Enhance the readability-redundant-string-cstr check to also handle
calls to data().
Reviewers: etienneb, alexfh, aaron.ballman
Subscribers: cfe-commits
Differential Revision: https://reviews.llvm.org/D26279
llvm-svn: 285901
Summary:
The goal of the patch is to bring checkers in their appropriate namespace.
This path doesn't change any behavior.
Reviewers: alexfh
Subscribers: cfe-commits
Differential Revision: http://reviews.llvm.org/D19811
llvm-svn: 268264
Summary:
The string class contains methods which support receiving either a string literal or a string object.
For example, calls to append can receive either a char* or a string.
```
string& append (const string& str);
string& append (const char* s);
```
Which make these cases equivalent, and the .c_str() useless:
```
std::string s = "123";
str.append(s);
str.append(s.c_str());
```
In these cases, removing .c_str() doesn't provide any size or speed improvement.
It's only a readability issue.
If the string contains embedded NUL characters, the string literal and the string
object won't produce the same semantic.
Reviewers: alexfh, sbenza
Subscribers: LegalizeAdulthood, aaron.ballman, chapuni, Eugene.Zelenko, cfe-commits
Differential Revision: http://reviews.llvm.org/D18475
llvm-svn: 266463
Summary:
The current checker is able to recognize std::string but does not recognize other string variants.
This patch is adding the support for any string defined with basic_string without considering the
the underlying char type.
The most common variant is: 'std::wstring' based on 'wchar_t'.
There are also other string variants added to the standard: u16string, u32string, etc...
Reviewers: alexfh
Subscribers: mamai, dblaikie, cfe-commits
Differential Revision: http://reviews.llvm.org/D18412
llvm-svn: 264325
Summary:
The string constructors are not defined using optional parameters and are not recognize by the checker.
The constructor defined in the MSVC header is defined with 1 parameter. Therefore, patterns are not recognized by the checker.
The current patch add support to accept constructor with only one parameter.
Repro on a Visual Studio 14 installation with the following code:
```
void f1(const std::string &s) {
f1(s.c_str());
}
```
In the xstring.h header, the constructors are defined this way:
```
basic_string(const _Myt& _Right) [...]
basic_string(const _Myt& _Right, const _Alloc& _Al) [...]
```
The CXXConstructExpr to recognize only contains 1 parameter.
```
CXXConstructExpr 0x3f1a070 <C:\src\llvm\examples\test.cc:6:6, col:14> 'const std::string':'const class std::basic_string<char, struct std::char_traits<char>, class
std::allocator<char> >' 'void (const char *) __attribute__((thiscall))'
`-CXXMemberCallExpr 0x3f1a008 <col:6, col:14> 'const char *'
`-MemberExpr 0x3f19fe0 <col:6, col:8> '<bound member function type>' .c_str 0x3cc22f8
`-DeclRefExpr 0x3f19fc8 <col:6> 'const std::string':'const class std::basic_string<char, struct std::char_traits<char>, class std::allocator<char> >' lvalue ParmVar 0x3f19c80 's' 'const std::string &'
```
Reviewers: aaron.ballman, alexfh
Subscribers: aemerson
Differential Revision: http://reviews.llvm.org/D18285
llvm-svn: 264075
Haojian Wu