native: try to catch native function crashes

native/abnativefunctions.cpp

@@ -1466,6 +1466,43 @@ void disable_logger() {
   logger = reinterpret_cast<Logger *>(new NullLogger());
 }
 
+void autobuild_crash_handler(int sig, siginfo_t *info, void *ucontext) {
+  auto *log = reinterpret_cast<BaseLogger *>(logger);
+  if (log) {
+    Diagnostic diagnostic{};
+    diagnostic.code = sig;
+    diagnostic.level = LogLevel::Critical;
+    void *addr = nullptr;
+    switch (sig) {
+    case SIGSEGV:
+    case SIGILL:
+    case SIGFPE:
+    case SIGBUS:
+      addr = info ? info->si_addr : nullptr;
+      break;
+    default:
+      break;
+    }
+    diagnostic.frames.push_back(DiagnosticFrame{
+        .file = "<native code>",
+        .function = "<native function>",
+        .line = 0,
+    });
+    log->logDiagnostic(diagnostic);
+    log->error(fmt::format("Got signal {0} at address {1}", sig, addr));
+    log->logException("autobuild received signal: " +
+                      std::string(strsignal(sig)));
+  }
+  exit(1);
+}
+
+void setup_crash_handler() {
+  struct sigaction action{};
+  action.sa_sigaction = autobuild_crash_handler;
+  action.sa_flags = SA_SIGINFO;
+  sigaction(SIGSEGV, &action, nullptr);
+}
+
 void set_custom_arch(const char *arch) {
   get_logger()->info(
       fmt::format("Overriding target architecture to {0}", arch));

native/abnativefunctions.h

@@ -13,6 +13,7 @@ int start_proc_00();
 int dump_defines();
 void disable_logger();
 void set_custom_arch(const char *arch);
+void setup_crash_handler();
 
 #ifdef __cplusplus
 } // extern "C"

native/autobuild.c

@@ -57,6 +57,7 @@ int autobuild_builtin(WORD_LIST *list) {
 /* Called when `template' is enabled and loaded from the shared object.  If this
    function returns 0, the load fails. */
 int autobuild_builtin_load(char *name) {
+  setup_crash_handler();
   if (register_builtin_variables() != 0) {
     return 0;
   }

native/logger.cpp

@@ -174,7 +174,8 @@ void ColorfulLogger::logDiagnostic(Diagnostic diagnostic) {
       // first call
       buffer += fmt::format("\e[0mIn file included from \e[1m{0}:{1}\n",
                             frame.file, frame.line);
-      continue;
+      if (diagnostic.frames.size() > 1)
+        continue;
     }
     if ((it + 1) == diagnostic.frames.rend()) {
       // last call