Bug hunting; Avoid bailout uninit FP, stream object

lib/bughuntingchecks.cpp

@@ -269,6 +269,10 @@ static void uninit(const Token *tok, const ExprEngine::Value &value, ExprEngine:
         if (Token::Match(tok, "%var% .") && tok->next()->originalName() != "->")
             return;
 
+        // Assume that stream object is initialized
+        if (Token::Match(tok->previous(), "[;{}] %var% <<|>>") && !tok->next()->astParent())
+            return;
+
         // Containers are not uninitialized
         std::vector<const Token *> tokens{tok, tok->astOperand1(), tok->astOperand2()};
         if (Token::Match(tok->previous(), ". %name%"))

lib/exprengine.cpp

@@ -2241,6 +2241,10 @@ static std::string execute(const Token *start, const Token *end, Data &data)
         if (Token::Match(tok, "[;{}]"))
             data.trackProgramState(tok);
 
+        if (Token::simpleMatch(tok, "__CPPCHECK_BAILOUT__ ;"))
+            // This is intended for testing
+            throw ExprEngineException(tok, "__CPPCHECK_BAILOUT__");
+
         if (Token::simpleMatch(tok, "while (") && (tok->linkAt(1), ") ;") && tok->next()->astOperand1()->hasKnownIntValue() && tok->next()->astOperand1()->getKnownIntValue() == 0) {
             tok = tok->tokAt(4);
             continue;

test/testbughuntingchecks.cpp

@@ -40,6 +40,7 @@ private:
         TEST_CASE(uninit_function_par);
         TEST_CASE(uninit_malloc);
         TEST_CASE(uninit_struct);
+        TEST_CASE(uninit_bailout);
         TEST_CASE(ctu);
 #endif
     }
@@ -110,6 +111,22 @@ private:
         ASSERT_EQUALS("", errout.str());
     }
 
+    void uninit_bailout() {
+        check("void foo() {\n"
+              "    __CPPCHECK_BAILOUT__;\n"
+              "    int values[5];\n"
+              "    values[i] = 123;\n"
+              "}");
+        ASSERT_EQUALS("", errout.str());
+
+        check("void foo() {\n"
+              "    __CPPCHECK_BAILOUT__;\n"
+              "    std::ostringstream comm;\n"
+              "    comm << 123;\n"
+              "}");
+        ASSERT_EQUALS("", errout.str());
+    }
+
     void ctu() {
         check("void init(int &x) {\n"
               "    x = 1;\n"