h8300: Generate correct unwind info around swap_into/out_of_er6.

Minimal bug fix is to unset RTX_FRAME_RELATED_P on the PUSH
insn generated in h8300_swap_into_er6.  But with a tiny bit
of effort we can generate real unwind info around the sequence.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@177209 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 11 insertions, 18 deletions

diff --git a/gcc/dwarf2cfi.c b/gcc/dwarf2cfi.c
index 99b37abbff7..69218cb2dfe 100644
--- a/gcc/dwarf2cfi.c
+++ b/gcc/dwarf2cfi.c
@@ -778,8 +778,8 @@ def_cfa_1 (dw_cfa_location *new_cfa)
   if (cfi)
     {
       cur_row->cfa = *new_cfa;
-      if (cfi->dw_cfi_opc == DW_CFA_def_cfa_expression)
-        cur_row->cfa_cfi = cfi;
+      cur_row->cfa_cfi = (cfi->dw_cfi_opc == DW_CFA_def_cfa_expression
+			  ? cfi : NULL);
 
       add_cfi (cfi);
     }
@@ -1205,18 +1205,13 @@ dwarf2out_frame_debug_def_cfa (rtx pat)
 
   memset (&loc, 0, sizeof (loc));
 
-  switch (GET_CODE (pat))
+  if (GET_CODE (pat) == PLUS)
     {
-    case PLUS:
-      loc.reg = dwf_regno (XEXP (pat, 0));
       loc.offset = INTVAL (XEXP (pat, 1));
-      break;
-
-    case REG:
-      loc.reg = dwf_regno (pat);
-      break;
-
-    case MEM:
+      pat = XEXP (pat, 0);
+    }
+  if (MEM_P (pat))
+    {
       loc.indirect = 1;
       pat = XEXP (pat, 0);
       if (GET_CODE (pat) == PLUS)
@@ -1224,13 +1219,11 @@ dwarf2out_frame_debug_def_cfa (rtx pat)
 	  loc.base_offset = INTVAL (XEXP (pat, 1));
 	  pat = XEXP (pat, 0);
 	}
-      loc.reg = dwf_regno (pat);
-      break;
-
-    default:
-      /* Recurse and define an expression.  */
-      gcc_unreachable ();
     }
+  /* ??? If this fails, we could be calling into the _loc functions to
+     define a full expression.  So far no port does that.  */
+  gcc_assert (REG_P (pat));
+  loc.reg = dwf_regno (pat);
 
   def_cfa_1 (&loc);
 }