Add some debug support code

[c11tester.git] / model.cc

diff --git a/model.cc b/model.cc
index 4f8a03243161ec61aa25644159c9856ae01188f8..5b5ccf701c1798f9627c352f6ae50be4159fc929 100644 (file)
--- a/model.cc
+++ b/model.cc
@@ -26,6 +26,37 @@ void placeholder(void *) {
        ASSERT(0);
 }
 
+#include <signal.h>
+
+#define SIGSTACKSIZE 65536
+static void mprot_handle_pf(int sig, siginfo_t *si, void *unused)
+{
+       model_print("Segmentation fault at %p\n", si->si_addr);
+       model_print("For debugging, place breakpoint at: %s:%d\n",
+                                                       __FILE__, __LINE__);
+       print_trace();  // Trace printing may cause dynamic memory allocation
+       while(1)
+               ;
+}
+
+void install_handler() {
+       stack_t ss;
+       ss.ss_sp = model_malloc(SIGSTACKSIZE);
+       ss.ss_size = SIGSTACKSIZE;
+       ss.ss_flags = 0;
+       sigaltstack(&ss, NULL);
+       struct sigaction sa;
+       sa.sa_flags = SA_SIGINFO | SA_NODEFER | SA_RESTART | SA_ONSTACK;
+       sigemptyset(&sa.sa_mask);
+       sa.sa_sigaction = mprot_handle_pf;
+
+       if (sigaction(SIGSEGV, &sa, NULL) == -1) {
+               perror("sigaction(SIGSEGV)");
+               exit(EXIT_FAILURE);
+       }
+
+}
+
 /** @brief Constructor */
 ModelChecker::ModelChecker() :
        /* Initialize default scheduler */
@@ -56,6 +87,7 @@ ModelChecker::ModelChecker() :
        /* Configure output redirection for the model-checker */
        redirect_output();
        install_trace_analyses(get_execution());
+       install_handler();
 }
 
 /** @brief Destructor */
@@ -261,7 +293,7 @@ void ModelChecker::finish_execution(bool more_executions)
 // test code
        execution_number ++;
        if (more_executions)
-         reset_to_initial_state();
+               reset_to_initial_state();
        history->set_new_exec_flag();
 }