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ValueFlow: handle x+=y for containers

This commit is contained in:
Daniel Marjamäki 2018-10-27 18:38:04 +02:00
parent b998dcb5aa
commit 06ede9c239
2 changed files with 34 additions and 1 deletions
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21
lib/valueflow.cpp
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@ -3481,7 +3481,7 @@ static void valueFlowContainerReverse(const Token *tok, unsigned int containerId
}
}
static void valueFlowContainerForward(const Token *tok, unsigned int containerId, const ValueFlow::Value &value, const Settings *settings, bool cpp)
static void valueFlowContainerForward(const Token *tok, unsigned int containerId, ValueFlow::Value value, const Settings *settings, bool cpp)
{
while (nullptr != (tok = tok->next())) {
if (Token::Match(tok, "[{}]"))
@ -3490,6 +3490,25 @@ static void valueFlowContainerForward(const Token *tok, unsigned int containerId
continue;
if (Token::Match(tok, "%name% ="))
break;
if (Token::Match(tok, "%name% +=")) {
if (!tok->valueType() || !tok->valueType()->container || !tok->valueType()->container->stdStringLike)
break;
const Token *rhs = tok->next()->astOperand2();
if (rhs->tokType() == Token::eString)
value.intvalue += Token::getStrLength(rhs);
else if (rhs->valueType() && rhs->valueType()->container && rhs->valueType()->container->stdStringLike) {
bool found = false;
for (const ValueFlow::Value &rhsval : rhs->values()) {
if (rhsval.isKnown() && rhsval.isContainerSizeValue()) {
value.intvalue += rhsval.intvalue;
found = true;
}
}
if (!found)
break;
} else
break;
}
if (isLikelyStreamRead(cpp, tok->astParent()))
break;
if (isContainerSizeChangedByFunction(tok))

14
test/testvalueflow.cpp
View File

@ -3384,6 +3384,20 @@ private:
"}";
ASSERT_EQUALS("", isKnownContainerSizeValue(tokenValues(code, "s . size"), 3));
code = "void f() {\n"
" std::string s=\"abc\";\n" // size of s is 3
" s += unknown;\n"
" s.size();\n"
"}";
ASSERT(tokenValues(code, "s . size").empty());
code = "void f() {\n"
" std::string s=\"abc\";\n" // size of s is 3
" s += \"def\";\n" // size of s => 6
" s.size();\n"
"}";
ASSERT_EQUALS("", isKnownContainerSizeValue(tokenValues(code, "s . size"), 6));
// valueFlowContainerForward, function call
code = "void f() {\n"
" std::list<int> x;\n"