DACA: Try to avoid some crashes/hangs for the most crazy code so we can focus on most serious bugs first

cli/cmdlineparser.cpp

@@ -664,6 +664,7 @@ bool CmdLineParser::parseFromArgs(int argc, const char* const argv[])
                     mSettings->templateFormat = "{file}:{line}:{column}: warning: {message} [{id}]\\n{code}";
                     mSettings->templateLocation = "{file}:{line}:{column}: note: {info}\\n{code}";
                 } else if (mSettings->templateFormat == "daca2") {
+                    mSettings->daca = true;
                     mSettings->templateFormat = "{file}:{line}:{column}: {severity}: {message} [{id}]";
                     mSettings->templateLocation = "{file}:{line}:{column}: note: {info}";
                 } else if (mSettings->templateFormat == "vs")

lib/settings.cpp

@@ -36,6 +36,7 @@ Settings::Settings()
       checkUnusedTemplates(false),
       clang(false),
       clangTidy(false),
+      daca(false),
       debugSimplified(false),
       debugnormal(false),
       debugwarnings(false),

lib/settings.h

@@ -105,6 +105,9 @@ public:
     /** @brief include paths excluded from checking the configuration */
     std::set<std::string> configExcludePaths;
 
+    /** @brief Are we running from DACA script? */
+    bool daca;
+
     /** @brief Is --debug-simplified given? */
     bool debugSimplified;
 

lib/tokenize.cpp

@@ -4297,6 +4297,20 @@ bool Tokenizer::simplifyTokenList1(const char FileName[])
         }
     }
 
+    // Some special bailouts in DACA. To avoid too much hangs/crashes.
+    // FIXME: This is hopefully temporary. Somehow it should not be used in releases.
+    if (mSettings->daca) {
+        int numcase = 0;
+        for (const Token *tok = list.front(); tok; tok = tok->next()) {
+            if (Token::Match(tok, "%name% [ %num% ] = {") && MathLib::toLongNumber(tok->strAt(2)) > 10000)
+                return false;
+            if (tok->str() == "case") {
+                if (++numcase > 10000)
+                    return false;
+            }
+        }
+    }
+
     // Is there C++ code in C file?
     validateC();