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FwdAnalysis: better handling of loops

This commit is contained in:
Daniel Marjamäki 2018-12-16 11:42:11 +01:00
parent 3af0d73f82
commit 97d2075007
1 changed files with 29 additions and 1 deletions
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30
lib/astutils.cpp
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@ -1093,7 +1093,35 @@ struct FwdAnalysis::Result FwdAnalysis::checkRecursive(const Token *expr, const
if (tok->str() == "}") {
Scope::ScopeType scopeType = tok->scope()->type;
if (scopeType == Scope::eWhile || scopeType == Scope::eFor || scopeType == Scope::eDo) {
// TODO: check condition
// check condition
const Token *conditionStart = nullptr;
const Token *conditionEnd = nullptr;
if (Token::simpleMatch(tok->link()->previous(), ") {")) {
conditionEnd = tok->link()->previous();
conditionStart = conditionEnd->link();
} else if (Token::simpleMatch(tok->link()->previous(), "do {") && Token::simpleMatch(tok, "} while (")) {
conditionStart = tok->tokAt(2);
conditionEnd = conditionStart->link();
}
if (conditionStart && conditionEnd) {
bool write = false;
for (const Token *condTok = conditionStart; condTok != conditionEnd; condTok = condTok->next()) {
if (Token::Match(condTok, "=|++|--")) {
visitAstNodes(condTok->astOperand1(),
[&](const Token *writeTok) {
if (exprVarIds.find(writeTok->varId()) != exprVarIds.end())
write = true;
return write ? ChildrenToVisit::done : ChildrenToVisit::op1_and_op2;
});
if (write)
break;
}
}
if (write)
return Result(Result::Type::BAILOUT);
}
// check loop body again..
const struct FwdAnalysis::Result &result = checkRecursive(expr, tok->link(), tok, exprVarIds, local);
if (result.type == Result::Type::BAILOUT || result.type == Result::Type::READ)
return result;