Add debug trace in amd64-windows-tdep.c::amd64_windows_frame_decode_insns

This is a trace which would have been useful when trying to understand
why the debugger was not decoding the stream of unwind codes I was
expecting.  This patch adds a trace first informing us that we are
following the unwind info to the next unwind record in that chain.

gdb/ChangeLog:

        * amd64-windows-tdep.c (amd64_windows_frame_decode_insns):
        Add debug trace.

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 939fd20..2d50d35 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,6 +1,11 @@
 2014-08-01  Joel Brobecker  <brobecker@adacore.com>
 
        * amd64-windows-tdep.c (amd64_windows_frame_decode_insns):
+       Add debug trace.
+
+2014-08-01  Joel Brobecker  <brobecker@adacore.com>
+
+       * amd64-windows-tdep.c (amd64_windows_frame_decode_insns):
        Remove "+ 8" offset in computation of CHAIN_VMA.
 
 2014-07-31  Doug Evans  <dje@google.com>

diff --git a/gdb/amd64-windows-tdep.c b/gdb/amd64-windows-tdep.c
index cb1bac7..f90bd5b 100644 (file)
--- a/gdb/amd64-windows-tdep.c
+++ b/gdb/amd64-windows-tdep.c
@@ -837,6 +837,15 @@ amd64_windows_frame_decode_insns (struct frame_info *this_frame,
            extract_unsigned_integer (d.rva_EndAddress, 4, byte_order);
          unwind_info =
            extract_unsigned_integer (d.rva_UnwindData, 4, byte_order);
+
+         if (frame_debug)
+           fprintf_unfiltered
+             (gdb_stdlog,
+              "amd64_windows_frame_decodes_insn (next in chain):"
+              " unwind_data=%s, start_rva=%s, end_rva=%s\n",
+              paddress (gdbarch, unwind_info),
+              paddress (gdbarch, cache->start_rva),
+              paddress (gdbarch, cache->end_rva));
        }
 
       /* Allow the user to break this loop.  */