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Fix issue 9268: false negative: (style) Condition '...' is always true (#2080) 

* Fix issue 9268: false negative: (style) Condition '...' is always true

* Fix copy and paste mistake
This commit is contained in:
Paul Fultz II 2019-08-13 23:34:27 -05:00 committed by Daniel Marjamäki
parent 13df5b2413
commit 0c1dff5c93
2 changed files with 12 additions and 0 deletions
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3
lib/valueflow.cpp
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@ -3911,6 +3911,7 @@ struct ValueFlowConditionHandler {
startTokens[1] = top->link()->linkAt(1)->tokAt(2);
bool bail = false;
const bool bothCanBeKnown = check_if && check_else && !Token::Match(tok->astParent(), "&&|%oror%");
for (int i = 0; i < 2; i++) {
const Token *const startToken = startTokens[i];
@ -3918,6 +3919,8 @@ struct ValueFlowConditionHandler {
continue;
std::list<ValueFlow::Value> &values = (i == 0 ? cond.true_values : cond.false_values);
valueFlowSetConditionToKnown(tok, values, i == 0);
if (bothCanBeKnown)
valueFlowSetConditionToKnown(tok, values, i != 0);
bool changed = forward(startTokens[i], startTokens[i]->link(), var, values, true);
values.front().setPossible();

9
test/testcondition.cpp
View File

@ -3197,6 +3197,15 @@ private:
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:5]: (style) Condition 'array' is always true\n", errout.str());
check("void f(int *array, int size ) {\n"
" for(int i = 0; i < size; ++i) {\n"
" if(array == 0)\n"
" continue;\n"
" else if(array){}\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:5]: (style) Condition 'array' is always true\n", errout.str());
}
void multiConditionAlwaysTrue() {