Set values when assigning init list (danmar#5057)

* Assign values to pointers with C++11 init

* Handle assigning empty init list

* Fix #10596 FN uninitdata with value initialization

* Fix test

* Set values when assigning init list

Author: chrchr-github

lib/valueflow.cpp

@@ -1343,11 +1343,17 @@ static Token * valueFlowSetConstantValue(Token *tok, const Settings *settings, b
         if (!tok->isTemplateArg())
             value.setKnown();
         setTokenValue(tok->next(), std::move(value), settings, isInitList);
-    } else if (Token::Match(tok, "%name% = { }") && tok->variable() &&
+    } else if (Token::Match(tok, "%name% = {") && tok->variable() &&
                (tok->variable()->isPointer() || (tok->variable()->valueType() && tok->variable()->valueType()->isIntegral()))) {
-        ValueFlow::Value value(0);
-        value.setKnown();
-        setTokenValue(tok->tokAt(2), std::move(value), settings, isInitList);
+        if (Token::simpleMatch(tok->tokAt(3), "}")) {
+            ValueFlow::Value value(0);
+            value.setKnown();
+            setTokenValue(tok->tokAt(2), std::move(value), settings, isInitList);
+        } else if (tok->tokAt(2)->astOperand1() && tok->tokAt(2)->astOperand1()->hasKnownIntValue()) {
+            ValueFlow::Value value(tok->tokAt(2)->astOperand1()->getKnownIntValue());
+            value.setKnown();
+            setTokenValue(tok->tokAt(2), std::move(value), settings, isInitList);
+        }
     }
     return tok->next();
 }

test/testvalueflow.cpp

@@ -5094,6 +5094,22 @@ class TestValueFlow : public TestFixture {
         ASSERT_EQUALS(true, value.isKnown());
         ASSERT_EQUALS(1, value.intvalue);
 
+        code = "bool f() {\n"
+               "  int* p = { 0 };\n"
+               "  return p == nullptr;\n" // <- known value
+               "}";
+        value = valueOfTok(code, "==");
+        ASSERT_EQUALS(true, value.isKnown());
+        ASSERT_EQUALS(1, value.intvalue);
+
+        code = "bool f() {\n"
+               "  int i = { 1 };\n"
+               "  return i == 1;\n" // <- known value
+               "}";
+        value = valueOfTok(code, "==");
+        ASSERT_EQUALS(true, value.isKnown());
+        ASSERT_EQUALS(1, value.intvalue);
+
         // calculation with known result
         code = "int f(int x) { a = x & 0; }"; // <- & is 0
         value = valueOfTok(code, "&");