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Fixed #10 (ValueFlow: condition variable has known value in switch case)

This commit is contained in:
Daniel Marjamäki 2017-10-16 21:51:30 +02:00
parent f27e98f910
commit 6d59290858
2 changed files with 13 additions and 2 deletions
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8
lib/valueflow.cpp
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@ -2885,12 +2885,18 @@ static void valueFlowSwitchVariable(TokenList *tokenlist, SymbolDatabase* symbol
std::list<ValueFlow::Value> values;
values.push_back(ValueFlow::Value(MathLib::toLongNumber(tok->next()->str())));
values.back().condition = tok;
const std::string info("case " + tok->next()->str() + ": " + vartok->str() + " is " + tok->next()->str() + " here.");
values.back().errorPath.push_back(ErrorPathItem(tok, info));
if ((Token::simpleMatch(tok->previous(), "{") || Token::simpleMatch(tok->tokAt(-2), "break ;")) && !Token::Match(tok->tokAt(3), ";| case"))
values.back().setKnown();
while (Token::Match(tok->tokAt(3), ";| case %num% :")) {
tok = tok->tokAt(3);
if (!tok->isName())
tok = tok->next();
values.push_back(ValueFlow::Value(MathLib::toLongNumber(tok->next()->str())));
values.back().condition = tok;
const std::string info2("case " + tok->next()->str() + ": " + vartok->str() + " is " + tok->next()->str() + " here.");
values.back().errorPath.push_back(ErrorPathItem(tok, info2));
}
for (std::list<ValueFlow::Value>::const_iterator val = values.begin(); val != values.end(); ++val) {
valueFlowReverse(tokenlist,
@ -2902,7 +2908,7 @@ static void valueFlowSwitchVariable(TokenList *tokenlist, SymbolDatabase* symbol
settings);
}
if (vartok->variable()->scope()) // #7257
valueFlowForward(tok, vartok->variable()->scope()->classEnd, vartok->variable(), vartok->varId(), values, false, false, tokenlist, errorLogger, settings);
valueFlowForward(tok->tokAt(3), vartok->variable()->scope()->classEnd, vartok->variable(), vartok->varId(), values, values.back().isKnown(), false, tokenlist, errorLogger, settings);
}
}
}

7
test/testvalueflow.cpp
View File

@ -1875,13 +1875,18 @@ private:
code = "void f(int x) {\n"
" a = x;\n" // <- x can be 14
" switch (x) {\n"
" case 14: a=x; break;\n" // <- x is 14
" case 14: a=x+2; break;\n" // <- x is 14
" };\n"
" a = x;\n" // <- x can be 14
"}";
ASSERT_EQUALS(true, testConditionalValueOfX(code, 2U, 14));
ASSERT_EQUALS(true, testConditionalValueOfX(code, 4U, 14));
ASSERT_EQUALS(true, testConditionalValueOfX(code, 6U, 14));
ValueFlow::Value value = valueOfTok(code, "+");
ASSERT_EQUALS(16, value.intvalue);
ASSERT(value.isKnown());
}
void valueFlowForLoop() {