Fix 10456: FP identicalConditionAfterEarlyExit with variable captured by reference (#3439)

lib/checkcondition.cpp

@@ -654,6 +654,8 @@ void CheckCondition::multiCondition2()
             const Token * const endToken = tok->scope()->bodyEnd;
 
             for (; tok && tok != endToken; tok = tok->next()) {
+                if (isExpressionChangedAt(cond1, tok, 0, false, mSettings, mTokenizer->isCPP()))
+                    break;
                 if (Token::Match(tok, "if|return")) {
                     const Token * condStartToken = tok->str() == "if" ? tok->next() : tok;
                     const Token * condEndToken = tok->str() == "if" ? condStartToken->link() : Token::findsimplematch(condStartToken, ";");

lib/valueflow.cpp

@@ -2131,6 +2131,10 @@ struct ValueFlowAnalyzer : Analyzer {
     }
 
     virtual Action isAliasModified(const Token* tok) const {
+        // Lambda function call
+        if (Token::Match(tok, "%var% ("))
+            // TODO: Check if modified in the lambda function
+            return Action::Invalid;
         int indirect = 0;
         if (tok->valueType())
             indirect = tok->valueType()->pointer;

test/testcondition.cpp

@@ -2676,6 +2676,17 @@ private:
               "    return ret;\n"
               "}");
         ASSERT_EQUALS("", errout.str());
+
+        // #10456
+        check("int f() {\n"
+              "    int i = 0;\n"
+              "    auto f = [&](bool b) { if (b) ++i; };\n"
+              "    if (i) return i;\n"
+              "    f(true);\n"
+              "    if (i) return i;\n"
+              "    return 0;\n"
+              "}\n");
+        ASSERT_EQUALS("", errout.str());
     }
 
     void innerConditionModified() {

test/testvalueflow.cpp

@@ -3242,6 +3242,16 @@ private:
                "  f();\n"
                "}";
         TODO_ASSERT_EQUALS(true, false, testValueOfX(code, 3U, 3));
+
+        code = "void f() {\n"
+               "  int x=3;\n"
+               "  auto f = [&](){ x++; }\n"
+               "  x = 1;\n"
+               "  f();\n"
+               "  int a = x;\n" // x is actually 2
+               "}";
+        ASSERT_EQUALS(false, testValueOfX(code, 6U, 1));
+        ASSERT_EQUALS(false, testValueOfX(code, 6U, 3));
     }
 
     void valueFlowForwardTryCatch() {