On Wed, Sep 03, 2014 at 03:01:17PM +0930, Alan Modra wrote:
> In fact if you look at the corresponding location expression for
> -fno-section-anchors code you get something quite screwy too.
>
> 0000018f 00000108 00000114 (DW_OP_breg10 (r10): 0; DW_OP_addr: 144;
> DW_OP_plus; DW_OP_stack_value
>
> which is (r10) + &modulus.
Fixed with this obvious patch. Emitting part of a .debug_loc expression
is worse than no expression. Bootstrapped and regression tested
x86_64-linux and committed revision 214899.
PR debug/60655
* dwarf2out.c (mem_loc_descriptor <PLUS>): Return NULL if addend
can't be output.
Index: gcc/dwarf2out.c
===================================================================
--- gcc/dwarf2out.c (revision 214898)
+++ gcc/dwarf2out.c (working copy)
@@ -12699,7 +12699,7 @@ mem_loc_descriptor (rtx rtl, enum machine_mode mod
op1 = mem_loc_descriptor (XEXP (rtl, 1), mode, mem_mode,
VAR_INIT_STATUS_INITIALIZED);
if (op1 == 0)
- break;
+ return NULL;
add_loc_descr (&mem_loc_result, op1);
add_loc_descr (&mem_loc_result,
new_loc_descr (DW_OP_plus, 0, 0));
--
Alan Modra
Australia Development Lab, IBM
