walkero
/
cppcheck
1
0
Fork 0
Code Issues Pull Requests Projects Releases 1 Wiki Activity

Support prefix-increment/decrement in CheckAutoVariables::assignFunctionArg() (#3177)

This commit is contained in:
PKEuS 2016-10-10 21:34:40 +02:00
parent 1227a3f596
commit 1715969f6f
2 changed files with 18 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
lib/checkautovariables.cpp
View File

@ -178,15 +178,19 @@ void CheckAutoVariables::assignFunctionArg()
for (std::size_t i = 0; i < functions; ++i) {
const Scope * scope = symbolDatabase->functionScopes[i];
for (const Token *tok = scope->classStart; tok && tok != scope->classEnd; tok = tok->next()) {
if (Token::Match(tok, "[;{}] %var% =|++|--") &&
isNonReferenceArg(tok->next()) &&
!Token::Match(tok->tokAt(2), "= %varid% ;", tok->next()->varId()) &&
!variableIsUsedInScope(Token::findsimplematch(tok->tokAt(2), ";"), tok->next()->varId(), scope) &&
!Token::findsimplematch(tok, "goto", scope->classEnd)) {
if (tok->next()->variable()->isPointer() && printWarning)
errorUselessAssignmentPtrArg(tok->next());
else if (printStyle)
errorUselessAssignmentArg(tok->next());
if (Token::Match(tok, "[;{}] %var% =|++|--") || Token::Match(tok, "[;{}] ++|-- %var%")) {
const Token* vartok = tok->next();
if (!vartok->variable())
vartok = vartok->next();
if (isNonReferenceArg(vartok) &&
!Token::Match(vartok->next(), "= %varid% ;", vartok->varId()) &&
!variableIsUsedInScope(Token::findsimplematch(vartok->next(), ";"), vartok->varId(), scope) &&
!Token::findsimplematch(vartok, "goto", scope->classEnd)) {
if (vartok->variable()->isPointer() && printWarning)
errorUselessAssignmentPtrArg(vartok);
else if (printStyle)
errorUselessAssignmentArg(vartok);
}
}
}
}

5
test/testautovariables.cpp
View File

@ -328,6 +328,11 @@ private:
" ptr++;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Assignment of function parameter has no effect outside the function. Did you forget dereferencing it?\n", errout.str());
check("void foo(int* ptr) {\n" // #3177
" --ptr;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Assignment of function parameter has no effect outside the function. Did you forget dereferencing it?\n", errout.str());
}
void testautovar11() { // #4641 - fp, assign local struct member address to function parameter