Fix #12943 FP knownConditionTrueFalse with lambda in if condition (danmar#6714)

Author: chrchr-github

lib/symboldatabase.cpp

@@ -153,6 +153,8 @@ void SymbolDatabase::createSymbolDatabaseFindAllScopes()
         return endInitList.top().second == scope;
     };
 
+    std::stack<const Token*> inIfCondition;
+
     auto addLambda = [this, &scope](const Token* tok, const Token* lambdaEndToken) -> const Token* {
         const Token* lambdaStartToken = lambdaEndToken->link();
         const Token* argStart = lambdaStartToken->astParent();
@@ -732,7 +734,8 @@ void SymbolDatabase::createSymbolDatabaseFindAllScopes()
                     scope->checkVariable(tok->tokAt(2), AccessControl::Local, mSettings); // check for variable declaration and add it to new scope if found
                 else if (scope->type == Scope::eCatch)
                     scope->checkVariable(tok->tokAt(2), AccessControl::Throw, mSettings); // check for variable declaration and add it to new scope if found
-                tok = scopeStartTok;
+                tok = tok->next();
+                inIfCondition.push(scopeStartTok);
             } else if (Token::Match(tok, "%var% {")) {
                 endInitList.emplace(tok->linkAt(1), scope);
                 tok = tok->next();
@@ -741,6 +744,8 @@ void SymbolDatabase::createSymbolDatabaseFindAllScopes()
             } else if (tok->str() == "{") {
                 if (inInitList()) {
                     endInitList.emplace(tok->link(), scope);
+                } else if (!inIfCondition.empty() && tok == inIfCondition.top()) {
+                    inIfCondition.pop();
                 } else if (isExecutableScope(tok)) {
                     scopeList.emplace_back(this, tok, scope, Scope::eUnconditional, tok);
                     scope->nestedList.push_back(&scopeList.back());

test/testsymboldatabase.cpp

@@ -433,6 +433,7 @@ class TestSymbolDatabase : public TestFixture {
         TEST_CASE(createSymbolDatabaseFindAllScopes6);
         TEST_CASE(createSymbolDatabaseFindAllScopes7);
         TEST_CASE(createSymbolDatabaseFindAllScopes8); // #12761
+        TEST_CASE(createSymbolDatabaseFindAllScopes9);
 
         TEST_CASE(createSymbolDatabaseIncompleteVars);
 
@@ -5849,6 +5850,15 @@ class TestSymbolDatabase : public TestFixture {
         ASSERT(myst1->scope() != myst2->scope());
     }
 
+    void createSymbolDatabaseFindAllScopes9() // #12943
+    {
+        GET_SYMBOL_DB("void f(int n) {\n"
+                      "    if ([](int i) { return i == 2; }(n)) {}\n"
+                      "}\n");
+        ASSERT(db && db->scopeList.size() == 4);
+        ASSERT_EQUALS(db->scopeList.back().type, Scope::eLambda);
+    }
+
     void createSymbolDatabaseIncompleteVars()
     {
         {