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Fixed #8978 (False positive: Variable assigned value that is never used when assigning via iterator)

This commit is contained in:
Daniel Marjamäki 2019-11-16 19:49:43 +01:00
parent e0fe8fa2cd
commit 5654630099
2 changed files with 26 additions and 8 deletions
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25
lib/checkunusedvar.cpp
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@ -1185,16 +1185,25 @@ void CheckUnusedVar::checkFunctionVariableUsage()
op1tok = op1tok->astOperand1();
const Variable *op1Var = op1tok ? op1tok->variable() : nullptr;
if (op1Var && op1Var->isReference() && op1Var->nameToken() != tok->astOperand1())
// todo: check references
continue;
if (op1Var) {
if (op1Var->isReference() && op1Var->nameToken() != tok->astOperand1())
// todo: check references
continue;
if (op1Var && op1Var->isStatic())
// todo: check static variables
continue;
if (op1Var->isStatic())
// todo: check static variables
continue;
if (op1Var && op1Var->nameToken()->isAttributeUnused())
continue;
if (op1Var->nameToken()->isAttributeUnused())
continue;
// Bailout for unknown template classes, we have no idea what side effects such assignments have
if (mTokenizer->isCPP() &&
op1Var->isClass() &&
(!op1Var->valueType() || op1Var->valueType()->type == ValueType::Type::UNKNOWN_TYPE) &&
Token::findsimplematch(op1Var->typeStartToken(), "<", op1Var->typeEndToken()))
continue;
}
// Is there a redundant assignment?
const Token *start = tok->findExpressionStartEndTokens().second->next();

9
test/testunusedvar.cpp
View File

@ -201,6 +201,7 @@ private:
TEST_CASE(bracesInitCpp11);// #7895 - "int var{123}" initialization
TEST_CASE(argument);
TEST_CASE(argumentClass);
TEST_CASE(escapeAlias); // #9150
}
@ -4578,6 +4579,14 @@ private:
ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'foo.x' is assigned a value that is never used.\n", errout.str());
}
void argumentClass() {
functionVariableUsage(
"void foo(std::insert_iterator<C> it) {\n"
" it = 123;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void escapeAlias() {
functionVariableUsage(
"struct A {\n"