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

Fix 10289: ValueFlow; Wrong known value 'size_t - uint16_t > 0' (#3273)

This commit is contained in:
Paul Fultz II 2021-05-24 01:28:21 -05:00 committed by GitHub
parent 8ad0905e3b
commit ab50a75d8a
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 67 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
lib/valueflow.cpp
View File

@ -431,6 +431,19 @@ static T calculate(const std::string& s, const T& x, const T& y)
/** Set token value for cast */
static void setTokenValueCast(Token *parent, const ValueType &valueType, const ValueFlow::Value &value, const Settings *settings);
static bool isCompatibleValues(const ValueFlow::Value& value1, const ValueFlow::Value& value2)
{
if (value1.isKnown() || value2.isKnown())
return true;
if (value1.isImpossible() || value2.isImpossible())
return false;
if (value1.varId == 0 || value2.varId == 0)
return true;
if (value1.varId == value2.varId && value1.varvalue == value2.varvalue && value1.isIntValue() && value2.isIntValue())
return true;
return false;
}
/** set ValueFlow value and perform calculations if possible */
static void setTokenValue(Token* tok, const ValueFlow::Value &value, const Settings *settings)
{
@ -652,9 +665,8 @@ static void setTokenValue(Token* tok, const ValueFlow::Value &value, const Setti
continue;
if (value1.isIteratorValue() && value2.isIteratorValue())
continue;
if (value1.isKnown() || value2.isKnown() || value1.varId == 0 || value2.varId == 0 ||
(value1.varId == value2.varId && value1.varvalue == value2.varvalue && value1.isIntValue() &&
value2.isIntValue())) {
if (!isCompatibleValues(value1, value2))
continue;
ValueFlow::Value result(0);
combineValueProperties(value1, value2, &result);
const double floatValue1 = value1.isIntValue() ? value1.intvalue : value1.floatValue;
@ -705,7 +717,6 @@ static void setTokenValue(Token* tok, const ValueFlow::Value &value, const Setti
}
}
}
}
// !
else if (parent->str() == "!") {

8
test/testvalueflow.cpp
View File

@ -5629,6 +5629,14 @@ private:
" return x;\n"
"}\n";
ASSERT_EQUALS(true, testValueOfXImpossible(code, 3U, -1));
code = "size_t g();\n"
"auto f(uint16_t j) {\n"
" auto x = g() - j;\n"
" return x;\n"
"}\n";
ASSERT_EQUALS(false, testValueOfXImpossible(code, 4U, 0));
ASSERT_EQUALS(true, testValueOfXImpossible(code, 4U, -1));
}
};