From 0e10313d64f54dd587ebbcd5f413bd999333c911 Mon Sep 17 00:00:00 2001
From: Bruce Hill <bruce@bruce-hill.com>
Date: Sun, 24 Nov 2024 16:13:23 -0500
Subject: Switch `NaN` to be identical to the null value

---
 stdlib/stdlib.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'stdlib/stdlib.c')

diff --git a/stdlib/stdlib.c b/stdlib/stdlib.c
index 5dac3d3a..0e72dfc4 100644
--- a/stdlib/stdlib.c
+++ b/stdlib/stdlib.c
@@ -27,6 +27,18 @@
 
 public bool USE_COLOR;
 
+static void signal_handler(int sig, siginfo_t *, void *)
+{
+    assert(sig == SIGILL);
+    fflush(stdout);
+    if (USE_COLOR) fputs("\x1b[31;7m ===== ILLEGAL INSTRUCTION ===== \n\n\x1b[m", stderr);
+    else fputs("===== ILLEGAL INSTRUCTION =====\n\n", stderr);
+    print_stack_trace(stderr, 3, 4);
+    fflush(stderr);
+    raise(SIGABRT);
+    _exit(1);
+}
+
 public void tomo_init(void)
 {
    GC_INIT();
@@ -44,6 +56,12 @@ public void tomo_init(void)
 
    if (register_printf_specifier('k', printf_text, printf_text_size))
        errx(1, "Couldn't set printf specifier");
+
+   struct sigaction sigact;
+   sigact.sa_sigaction = signal_handler;
+   sigemptyset(&sigact.sa_mask);
+   sigact.sa_flags = 0;
+   sigaction(SIGILL, &sigact, (struct sigaction *)NULL);
 }
 
 static bool parse_single_arg(const TypeInfo_t *info, char *arg, void *dest)
-- 
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