Print registers not saved in the frame as "<not saved>" instead of "<optimized out>".

[thirdparty/binutils-gdb.git] / gdb / dwarf2loc.c

diff --git a/gdb/dwarf2loc.c b/gdb/dwarf2loc.c
index c875d3a4afa3bf43836107167c694d20a09003e5..8242dca93b83a065b3fd5cb2a60375a0b518f7a7 100644 (file)
--- a/gdb/dwarf2loc.c
+++ b/gdb/dwarf2loc.c
@@ -2290,11 +2290,21 @@ dwarf2_evaluate_loc_desc_full (struct type *type, struct frame_info *frame,
            if (byte_offset != 0)
              error (_("cannot use offset on synthetic pointer to register"));
            do_cleanups (value_chain);
-           if (gdb_regnum != -1)
-             retval = value_from_register (type, gdb_regnum, frame);
-           else
+          if (gdb_regnum == -1)
              error (_("Unable to access DWARF register number %d"),
                     dwarf_regnum);
+          retval = value_from_register (type, gdb_regnum, frame);
+          if (value_optimized_out (retval))
+            {
+              /* This means the register has undefined value / was
+                 not saved.  As we're computing the location of some
+                 variable etc. in the program, not a value for
+                 inspecting a register ($pc, $sp, etc.), return a
+                 generic optimized out value instead, so that we show
+                 <optimized out> instead of <not saved>.  */
+              do_cleanups (value_chain);
+              retval = allocate_optimized_out_value (type);
+            }
          }
          break;