Fix #11643 Tokenizer: garbage code 'for (()())' (#6120)

Author: chrchr-github

lib/tokenize.cpp

@@ -8537,13 +8537,15 @@ void Tokenizer::findGarbageCode() const
         if (!Token::simpleMatch(tok, "for (")) // find for loops
             continue;
         // count number of semicolons
-        int semicolons = 0;
+        int semicolons = 0, colons = 0;
         const Token* const startTok = tok;
         tok = tok->next()->link()->previous(); // find ")" of the for-loop
         // walk backwards until we find the beginning (startTok) of the for() again
         for (; tok != startTok; tok = tok->previous()) {
             if (tok->str() == ";") { // do the counting
                 semicolons++;
+            } else if (tok->str() == ":") {
+                colons++;
             } else if (tok->str() == ")") { // skip pairs of ( )
                 tok = tok->link();
             }
@@ -8553,6 +8555,8 @@ void Tokenizer::findGarbageCode() const
             syntaxError(tok);
         if (semicolons == 1 && !(isCPP() && mSettings.standards.cpp >= Standards::CPP20))
             syntaxError(tok);
+        if (semicolons == 0 && colons == 0)
+            syntaxError(tok);
     }
 
     // Operators without operands..

test/testgarbage.cpp

@@ -1174,8 +1174,7 @@ class TestGarbage : public TestFixture {
     }
 
     void garbageCode142() { // #7050
-        checkCode("{ } (  ) { void mapGraphs ( ) { node_t * n ; for (!oid n ) { } } } { }");
-        (void)errout_str(); // we are not interested in the output
+        ASSERT_THROW(checkCode("{ } (  ) { void mapGraphs ( ) { node_t * n ; for (!oid n ) { } } } { }"), InternalError);
     }
 
     void garbageCode143() { // #6922
@@ -1312,8 +1311,7 @@ class TestGarbage : public TestFixture {
         ASSERT_THROW(checkCode(code), InternalError);
 
         code = "void f1() { for (int n = 0 n < 10 n++); }";
-        checkCode(code);
-        (void)errout_str(); // we are not interested in the output
+        ASSERT_THROW(checkCode(code), InternalError);
     }
 
     void garbageSymbolDatabase() {

test/testtokenize.cpp

@@ -7048,6 +7048,8 @@ class TestTokenizer : public TestFixture {
         ASSERT_THROW_EQUALS(tokenizeAndStringify("int (*f) MACRO((void *));\n"), // #12010
                             InternalError,
                             "There is an unknown macro here somewhere. Configuration is required. If MACRO is a macro then please configure it.");
+
+        ASSERT_THROW(tokenizeAndStringify("{ for (()()) }"), InternalError); // #11643
     }