get_prev_frame, stop_reason != UNWIND_NO_REASON, add frame debug output.

[thirdparty/binutils-gdb.git] / gdb / frame.c

diff --git a/gdb/frame.c b/gdb/frame.c
index df1d2189d9853d26eea568c901ca7e98b0a111e2..db94d98b8d357e65e22f74c03b294791bf7f1631 100644 (file)
--- a/gdb/frame.c
+++ b/gdb/frame.c
@@ -48,6 +48,7 @@
 
 static struct frame_info *get_prev_frame_1 (struct frame_info *this_frame);
 static struct frame_info *get_prev_frame_raw (struct frame_info *this_frame);
+static const char *frame_stop_reason_symbol_string (enum unwind_stop_reason reason);
 
 /* We keep a cache of stack frames, each of which is a "struct
    frame_info".  The innermost one gets allocated (in
@@ -1771,7 +1772,18 @@ get_prev_frame_1 (struct frame_info *this_frame)
                                       &this_frame->prologue_cache);
 
   if (this_frame->stop_reason != UNWIND_NO_REASON)
-    return NULL;
+    {
+      if (frame_debug)
+       {
+         enum unwind_stop_reason reason = this_frame->stop_reason;
+
+         fprintf_unfiltered (gdb_stdlog, "-> ");
+         fprint_frame (gdb_stdlog, NULL);
+         fprintf_unfiltered (gdb_stdlog, " // %s }\n",
+                             frame_stop_reason_symbol_string (reason));
+       }
+      return NULL;
+    }
 
   /* Check that this frame's ID isn't inner to (younger, below, next)
      the next frame.  This happens when a frame unwind goes backwards.
@@ -2479,6 +2491,25 @@ frame_stop_reason_string (enum unwind_stop_reason reason)
     }
 }
 
+/* Return the enum symbol name of REASON as a string, to use in debug
+   output.  */
+
+static const char *
+frame_stop_reason_symbol_string (enum unwind_stop_reason reason)
+{
+  switch (reason)
+    {
+#define SET(name, description) \
+    case name: return #name;
+#include "unwind_stop_reasons.def"
+#undef SET
+
+    default:
+      internal_error (__FILE__, __LINE__,
+                     "Invalid frame stop reason");
+    }
+}
+
 /* Clean up after a failed (wrong unwinder) attempt to unwind past
    FRAME.  */