Fix #12823 Crash in isVariableChanged() with unknown macro (#6494)

Author: chrchr-github

lib/tokenize.cpp

@@ -8706,6 +8706,8 @@ void Tokenizer::findGarbageCode() const
             if (!Token::Match(tok->next(), "%name%|*|~"))
                 syntaxError(tok, tok->strAt(-1) + " " + tok->str() + " " + tok->strAt(1));
         }
+        if (Token::Match(tok, "[{,] . %name%") && !Token::Match(tok->tokAt(3), "[.=[{]"))
+            syntaxError(tok->next());
         if (Token::Match(tok, "[!|+-/%^~] )|]"))
             syntaxError(tok);
         if (Token::Match(tok, "==|!=|<=|>= %comp%") && tok->strAt(-1) != "operator")
@@ -8760,6 +8762,8 @@ void Tokenizer::findGarbageCode() const
                 if (!tok2->next() || tok2->isControlFlowKeyword() || Token::Match(tok2, "typedef|static|."))
                     syntaxError(tok);
                 if (Token::Match(tok2, "%name% %name%") && tok2->str() == tok2->strAt(1)) {
+                    if (Token::simpleMatch(tok2->tokAt(2), ";"))
+                        continue;
                     if (tok2->isStandardType() && tok2->str() == "long")
                         continue;
                     if (Token::Match(tok2->tokAt(-1), "enum|struct|union") || (isCPP() && Token::Match(tok2->tokAt(-1), "class|::")))

test/testsimplifytypedef.cpp

@@ -218,6 +218,7 @@ class TestSimplifyTypedef : public TestFixture {
         TEST_CASE(simplifyTypedef151);
         TEST_CASE(simplifyTypedef152);
         TEST_CASE(simplifyTypedef153);
+        TEST_CASE(simplifyTypedef154);
 
         TEST_CASE(simplifyTypedefFunction1);
         TEST_CASE(simplifyTypedefFunction2); // ticket #1685
@@ -3605,6 +3606,14 @@ class TestSimplifyTypedef : public TestFixture {
         ASSERT_EQUALS(exp, tok(code));
     }
 
+    void simplifyTypedef154() {
+        const char code[] = "typedef int T;\n"
+                            "typedef T T;\n"
+                            "T t = 0;\n";
+        const char exp[] = "int t ; t = 0 ;";
+        ASSERT_EQUALS(exp, tok(code));
+    }
+
     void simplifyTypedefFunction1() {
         {
             const char code[] = "typedef void (*my_func)();\n"

test/testtokenize.cpp

@@ -7108,6 +7108,8 @@ class TestTokenizer : public TestFixture {
         // Ticket #9664
         ASSERT_NO_THROW(tokenizeAndStringify("S s = { .x { 2 }, .y[0] { 3 } };"));
 
+        ASSERT_THROW_INTERNAL(tokenizeAndStringify("f(0, .x());"), SYNTAX); // #12823
+
         // Ticket #11134
         ASSERT_NO_THROW(tokenizeAndStringify("struct my_struct { int x; }; "
                                              "std::string s; "