Suppress debug stepping into auto-loaded library code.

* debug.c (debug_set_state, debug_restore_state): New functions.

* debug.h (debug_state_t): New type.
(debug_set_state, debug_restore_state): Declared, and defined
as dummy macros in non-debug-support build.

* lisplib.c (opt_dbg_autoload): New global variable.
(lisplib_try_load): Disable or enable debugging around
library loading based on opt_dbg_autoload option.

* lisplib.h (opt_dbg_autoload): Declared.

* txr.c (help): List --debug-autoload option.
(no_dbg_support): New static function to avoid repeated code.
(txr_main): Add debugger option. Change duplicate no debug support
error messages into calls to no_dbg_support.

* txr.1: Document --debug-autoload

1 files changed, 7 insertions, 1 deletions

diff --git a/lisplib.c b/lisplib.c
index 699d076e..8a98a23e 100644
--- a/lisplib.c
+++ b/lisplib.c
@@ -35,10 +35,12 @@
 #include "stream.h"
 #include "hash.h"
 #include "gc.h"
+#include "debug.h"
 #include "txr.h"
 #include "lisplib.h"
 
 val dl_table;
+int opt_dbg_autoload;
 
 void set_dlt_entries(val dlt, val *name, val fun)
 {
@@ -186,5 +188,9 @@ void lisplib_init(void)
 val lisplib_try_load(val sym)
 {
   val fun = gethash(dl_table, sym);
-  return if3(fun, (funcall(fun), t), nil);
+  debug_state_t ds;
+  return if3(fun, (ds = debug_set_state(opt_dbg_autoload ? 0 : -1,
+                                        opt_dbg_autoload),
+                   funcall(fun),
+                   debug_restore_state(ds), t), nil);
 }