Set ValueType for auto with ternary (#5304)

Author: chrchr-github

addons/test/misra/misra-test.c

@@ -645,11 +645,11 @@ static void misra_10_1_ternary(void)
 
     a = ui16 << ui16; // 10.6
     a = ui16 << (get_bool(42) ? ui16 : ui16);
-    a = ui16 << (get_bool(42) ? ui16 : (get_bool(34) ? ui16 : ui16)); // 10.4
-    a = ui16 << (get_bool(42) ? (get_bool(34) ? ui16 : ui16) : ui16); // 10.4
-    a = ui16 << (get_bool(42) ? i16 : (get_bool(34) ? ui16 : ui16)); // 10.1
+    a = ui16 << (get_bool(42) ? ui16 : (get_bool(34) ? ui16 : ui16));
+    a = ui16 << (get_bool(42) ? (get_bool(34) ? ui16 : ui16) : ui16);
+    a = ui16 << (get_bool(42) ? i16 : (get_bool(34) ? ui16 : ui16)); // 10.1 10.4
     a = ui16 << (get_bool(42) ? (get_bool(34) ? ui16 : i16) : ui16); // 10.1 10.4
-    a = ui16 << (get_bool(42) ? (get_bool(34) ? ui16 : ui16) : i16); // 10.1
+    a = ui16 << (get_bool(42) ? (get_bool(34) ? ui16 : ui16) : i16); // 10.1 10.4
     a = ui16 << (get_bool(42) ? (get_bool(34) ? ui16 : ui8) : ui8); // 10.4
     a = ui16 << (get_bool(42) ? (get_bool(34) ? i16 : ui8) : ui8); // 10.1 10.4
     a = (get_bool(42) ? (get_bool(34) ? ui16 : ui8) : ui8) << ui16; // 10.4
@@ -1171,7 +1171,7 @@ static void misra_14_2_fn1(bool b) {
     g += 2;
     i2 ^= 2; // 14.2
     if (i2 == 2) {
-      g += g_arr[i2];
+      g += g_arr[i2]; // cppcheck-suppress legacyUninitvar
     }
     misra_14_2_init_value(&i2); // TODO: Fix false negative in function call
   }

lib/symboldatabase.cpp

@@ -6552,6 +6552,11 @@ void SymbolDatabase::setValueType(Token* tok, const ValueType& valuetype, Source
                     setValueType(parent, *vt1);
                 return;
             }
+
+            if (vt1->isTypeEqual(vt2)) {
+                setValueType(parent, *vt1);
+                return;
+            }
         }
 
         if (vt1->pointer != 0U) {

test/testsymboldatabase.cpp

@@ -510,6 +510,7 @@ class TestSymbolDatabase : public TestFixture {
         TEST_CASE(auto18);
         TEST_CASE(auto19);
         TEST_CASE(auto20);
+        TEST_CASE(auto21);
 
         TEST_CASE(unionWithConstructor);
 
@@ -5716,8 +5717,7 @@ class TestSymbolDatabase : public TestFixture {
         ASSERT_EQUALS(E1->value, 1);
         const Token* const a = Token::findsimplematch(tokenizer.tokens(), "auto");
         ASSERT(a && a->valueType());
-        TODO_ASSERT(E1->scope == a->valueType()->typeScope);
-        ASSERT_EQUALS(a->valueType()->type, ValueType::INT);
+        ASSERT(E1->scope == a->valueType()->typeScope);
     }
 
     void sizeOfType() {
@@ -9399,7 +9399,6 @@ class TestSymbolDatabase : public TestFixture {
         ASSERT(autoTok && autoTok->valueType());
         ASSERT_EQUALS(autoTok->valueType()->constness, 3);
         ASSERT_EQUALS(autoTok->valueType()->pointer, 1);
-        TODO_ASSERT(autoTok->valueType()->reference == Reference::LValue);
     }
 
     void auto19() { // #11517
@@ -9454,6 +9453,23 @@ class TestSymbolDatabase : public TestFixture {
         ASSERT_EQUALS(g->function()->tokenDef->linenr(), 4);
     }
 
+    void auto21() {
+        GET_SYMBOL_DB("int f(bool b) {\n"
+                      "    std::vector<int> v1(1), v2(2);\n"
+                      "    auto& v = b ? v1 : v2;\n"
+                      "    v.push_back(1);\n"
+                      "    return v.size();\n"
+                      "}\n");
+        ASSERT_EQUALS("", errout.str());
+        const Token* a = Token::findsimplematch(tokenizer.tokens(), "auto");
+        ASSERT(a && a->valueType());
+        ASSERT_EQUALS(a->valueType()->type, ValueType::CONTAINER);
+        const Token* v = Token::findsimplematch(a, "v . size");
+        ASSERT(v && v->valueType());
+        ASSERT_EQUALS(v->valueType()->type, ValueType::CONTAINER);
+        ASSERT(v->variable() && v->variable()->isReference());
+    }
+
     void unionWithConstructor() {
         GET_SYMBOL_DB("union Fred {\n"
                       "    Fred(int x) : i(x) { }\n"