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Bug hunting; avoid false positives for structs/classes with constructors

This commit is contained in:
Daniel Marjamäki 2020-07-18 18:54:21 +02:00
parent 7cb65b7f67
commit e9281babc4
2 changed files with 21 additions and 2 deletions
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11
lib/exprengine.cpp
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@ -2567,8 +2567,15 @@ static ExprEngine::ValuePtr createVariableValue(const Variable &var, Data &data)
data.addConstraints(value, var.nameToken());
return value;
}
if (valueType->type == ValueType::Type::RECORD)
return createStructVal(valueType->typeScope, var.isLocal() && !var.isStatic(), data);
if (valueType->type == ValueType::Type::RECORD) {
bool init = true;
if (var.isLocal() && !var.isStatic()) {
init = valueType->typeScope &&
valueType->typeScope->definedType &&
valueType->typeScope->definedType->needInitialization != Type::NeedInitialization::False;
}
return createStructVal(valueType->typeScope, init, data);
}
if (valueType->smartPointerType) {
auto structValue = createStructVal(valueType->smartPointerType->classScope, var.isLocal() && !var.isStatic(), data);
auto size = std::make_shared<ExprEngine::IntRange>(data.getNewSymbolName(), 1, ~0UL);

12
test/testbughuntingchecks.cpp
View File

@ -39,6 +39,7 @@ private:
TEST_CASE(uninit_array);
TEST_CASE(uninit_function_par);
TEST_CASE(uninit_malloc);
TEST_CASE(uninit_struct);
TEST_CASE(ctu);
#endif
}
@ -98,6 +99,17 @@ private:
ASSERT_EQUALS("[test.cpp:1]: (error) Cannot determine that '*p' is initialized\n", errout.str());
}
void uninit_struct() {
// Assume that constructors initialize all members
// TODO whole program analysis
check("struct Data { Data(); int x; }\n"
"void foo() {\n"
" Data data;\n"
" x = data.x;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void ctu() {
check("void init(int &x) {\n"
" x = 1;\n"