Fix ctuuninitvar false positive for struct that is partly initialized

Author: danmar

lib/ctu.cpp

@@ -402,6 +402,8 @@ CTU::FileInfo *CTU::getFileInfo(const Tokenizer *tokenizer)
                 argtok = addr ? addr : isReferenceArg(argtok);
                 if (!argtok || argtok->values().size() != 1U)
                     continue;
+                if (argtok->variable() && argtok->variable()->isClass())
+                    continue;
 
                 const ValueFlow::Value &v = argtok->values().front();
                 if (v.valueType == ValueFlow::Value::ValueType::UNINIT && !v.isInconclusive()) {

test/testuninitvar.cpp

@@ -6597,6 +6597,17 @@ class TestUninitVar : public TestFixture {
             "    return n;\n"
             "}\n");
         ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:1]: (error) Using argument i that points at uninitialized variable n\n", errout.str());
+
+        ctu("typedef struct { int type; int id; } Stem;\n"
+            "void lookupStem(recodeCtx h, Stem *stem) {\n"
+            "    i = stem->type & STEM_VERT;\n"
+            "}\n"
+            "void foo() {\n"
+            "    Stem stem;\n"
+            "    stem.type = 0;\n"
+            "    lookupStem(h, &stem);\n"
+            "}\n");
+        ASSERT_EQUALS("", errout.str());
     }
 };