walkero
/
cppcheck
1
0
Fork 0
Code Issues Pull Requests Projects Releases 1 Wiki Activity

Fixed #8247 (False positive knownConditionTrueFalse)

This commit is contained in:
Daniel Marjamäki 2017-10-20 17:31:58 +02:00
parent b73d4ce62e
commit 1d5e3e4f0c
2 changed files with 19 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
lib/valueflow.cpp
View File

@ -265,7 +265,7 @@ static ValueFlow::Value castValue(ValueFlow::Value value, const ValueType::Sign
value.valueType = ValueFlow::Value::INT;
value.intvalue = value.floatValue;
}
if (bit < 64) {
if (bit < MathLib::bigint_bits) {
value.intvalue &= (1ULL << bit) - 1ULL;
if (sign == ValueType::Sign::SIGNED && value.intvalue & (1ULL << (bit - 1ULL))) {
value.intvalue |= ~((1ULL << bit) - 1ULL);
@ -484,7 +484,7 @@ static void setTokenValue(Token* tok, const ValueFlow::Value &value, const Setti
result.intvalue = f ? (floatValue1 > floatValue2) : (value1->intvalue > value2->intvalue);
else if (parent->str() == ">=")
result.intvalue = f ? (floatValue1 >= floatValue2) : (value1->intvalue >= value2->intvalue);
else if (!f && parent->str() == ">>" && value1->intvalue >= 0 && value2->intvalue >= 0 && value2->intvalue < 64)
else if (!f && parent->str() == ">>" && value1->intvalue >= 0 && value2->intvalue >= 0 && value2->intvalue < MathLib::bigint_bits)
result.intvalue = value1->intvalue >> value2->intvalue;
else
break;
@ -499,7 +499,7 @@ static void setTokenValue(Token* tok, const ValueFlow::Value &value, const Setti
result.intvalue = f ? (floatValue1 < floatValue2) : (value1->intvalue < value2->intvalue);
else if (parent->str() == "<=")
result.intvalue = f ? (floatValue1 <= floatValue2) : (value1->intvalue <= value2->intvalue);
else if (!f && parent->str() == "<<" && value1->intvalue >= 0 && value2->intvalue >= 0 && value2->intvalue < 64)
else if (!f && parent->str() == "<<" && value1->intvalue >= 0 && value2->intvalue >= 0 && value2->intvalue < MathLib::bigint_bits)
result.intvalue = value1->intvalue << value2->intvalue;
else
break;
@ -569,8 +569,8 @@ static void setTokenValue(Token* tok, const ValueFlow::Value &value, const Setti
else if (tok->valueType()->type == ValueType::Type::LONG)
bits = settings->long_bit;
}
if (bits > 0 && bits < 64)
v.intvalue &= (1ULL<<bits) - 1ULL;
if (bits > 0 && bits < MathLib::bigint_bits)
v.intvalue &= (((MathLib::biguint)1)<<bits) - 1;
setTokenValue(parent, v, settings);
}
}
@ -2894,9 +2894,11 @@ static void valueFlowSwitchVariable(TokenList *tokenlist, SymbolDatabase* symbol
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));
bool known = false;
if ((Token::simpleMatch(tok->previous(), "{") || Token::simpleMatch(tok->tokAt(-2), "break ;")) && !Token::Match(tok->tokAt(3), ";| case"))
values.back().setKnown();
known = true;
while (Token::Match(tok->tokAt(3), ";| case %num% :")) {
known = false;
tok = tok->tokAt(3);
if (!tok->isName())
tok = tok->next();
@ -2914,8 +2916,11 @@ static void valueFlowSwitchVariable(TokenList *tokenlist, SymbolDatabase* symbol
errorLogger,
settings);
}
if (vartok->variable()->scope()) // #7257
if (vartok->variable()->scope()) {
if (known)
values.back().setKnown();
valueFlowForward(tok->tokAt(3), vartok->variable()->scope()->classEnd, vartok->variable(), vartok->varId(), values, values.back().isKnown(), false, tokenlist, errorLogger, settings);
}
}
}
}

11
test/testvalueflow.cpp
View File

@ -1874,7 +1874,7 @@ private:
void valueFlowSwitchVariable() {
const char *code;
code = "void f(int x) {\n"
" a = x;\n" // <- x can be 14
" a = x - 1;\n" // <- x can be 14
" switch (x) {\n"
" case 14: a=x+2; break;\n" // <- x is 14
" };\n"
@ -1884,10 +1884,13 @@ private:
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());
ValueFlow::Value value1 = valueOfTok(code, "-");
ASSERT_EQUALS(13, value1.intvalue);
ASSERT(!value1.isKnown());
ValueFlow::Value value2 = valueOfTok(code, "+");
ASSERT_EQUALS(16, value2.intvalue);
ASSERT(value2.isKnown());
}
void valueFlowForLoop() {