From b0bc27b262a42997978e27e393d6460127e5db77 Mon Sep 17 00:00:00 2001
From: drow <drow>
Date: Fri, 8 Apr 2005 12:10:21 +0000
Subject: [PATCH] 	* dwarf2-frame.c (struct dwarf2_frame_cache): New
 field 	undefined_retaddr. 	(dwarf2_frame_cache): Initialize
 undefined_retaddr. 	(dwarf2_frame_this_id): Return an invalid frame ID if 
 undefined_retaddr.

---
 gdb/dwarf2-frame.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/gdb/dwarf2-frame.c b/gdb/dwarf2-frame.c
index 1ac18598e6..22b8ae6f2f 100644
--- a/gdb/dwarf2-frame.c
+++ b/gdb/dwarf2-frame.c
@@ -610,6 +610,9 @@ struct dwarf2_frame_cache
   /* DWARF Call Frame Address.  */
   CORE_ADDR cfa;
 
+  /* Set if the return address column was marked as undefined.  */
+  int undefined_retaddr;
+
   /* Saved registers, indexed by GDB register number, not by DWARF
      register number.  */
   struct dwarf2_frame_state_reg *reg;
@@ -791,6 +794,10 @@ incomplete CFI data; unspecified registers (e.g., %s) at 0x%s"),
       }
   }
 
+  if (fs->retaddr_column < fs->regs.num_regs
+      && fs->regs.reg[fs->retaddr_column].how == DWARF2_FRAME_REG_UNDEFINED)
+    cache->undefined_retaddr = 1;
+
   do_cleanups (old_chain);
 
   *this_cache = cache;
@@ -804,6 +811,9 @@ dwarf2_frame_this_id (struct frame_info *next_frame, void **this_cache,
   struct dwarf2_frame_cache *cache =
     dwarf2_frame_cache (next_frame, this_cache);
 
+  if (cache->undefined_retaddr)
+    return;
+
   (*this_id) = frame_id_build (cache->cfa, frame_func_unwind (next_frame));
 }
 
-- 
2.11.0