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Fixes for CheckStl::string_c_str(): 

- Fixed false positive #7480
- Fixed false negative: Show performance message also for non-local objects
This commit is contained in:
PKEuS 2016-05-06 17:24:44 +02:00
parent 3366a74bb0
commit 896582ce56
2 changed files with 33 additions and 1 deletions
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6
lib/checkstl.cpp
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@ -1047,14 +1047,18 @@ void CheckStl::string_c_str()
}
bool local = false;
bool ptr = false;
const Variable* lastVar = nullptr;
const Function* lastFunc = nullptr;
bool funcStr = false;
if (Token::Match(tok2, "%var% .")) {
local = isLocal(tok2);
ptr = tok2->variable() && tok2->variable()->isPointer();
}
while (tok2) {
if (Token::Match(tok2, "%var% .|::")) {
if (ptr)
local = false;
lastVar = tok2->variable();
tok2 = tok2->tokAt(2);
} else if (Token::Match(tok2, "%name% (") && Token::simpleMatch(tok2->linkAt(1), ") .")) {
@ -1067,7 +1071,7 @@ void CheckStl::string_c_str()
}
if (Token::Match(tok2, "c_str|data ( ) ;")) {
if (local && lastVar && lastVar->isStlStringType())
if ((local || returnType != charPtr) && lastVar && lastVar->isStlStringType())
err = true;
else if (funcStr && lastVar && lastVar->isStlType(stl_string_stream))
err = true;

28
test/teststl.cpp
View File

@ -2303,6 +2303,34 @@ private:
" return String::Format(\"%s:\", name).c_str();\n"
"}");
ASSERT_EQUALS("", errout.str());
// #7480
check("struct InternalMapInfo {\n"
" std::string author;\n"
"};\n"
"const char* GetMapAuthor(int index) {\n"
" const InternalMapInfo* mapInfo = &internal_getMapInfo;\n"
" return mapInfo->author.c_str();\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct InternalMapInfo {\n"
" std::string author;\n"
"};\n"
"std::string GetMapAuthor(int index) {\n"
" const InternalMapInfo* mapInfo = &internal_getMapInfo;\n"
" return mapInfo->author.c_str();\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (performance) Returning the result of c_str() in a function that returns std::string is slow and redundant.\n", errout.str());
check("struct InternalMapInfo {\n"
" std::string author;\n"
"};\n"
"const char* GetMapAuthor(int index) {\n"
" const InternalMapInfo mapInfo = internal_getMapInfo;\n"
" return mapInfo.author.c_str();\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) Dangerous usage of c_str(). The value returned by c_str() is invalid after this call.\n", errout.str());
}
void autoPointer() {