http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55736
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |lto
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2012-12-19
AssignedTo|unassigned at gcc dot |rguenth at gcc dot gnu.org
|gnu.org |
Ever Confirmed|0 |1
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> 2012-12-19
10:50:06 UTC ---
Confirmed. We are writing
#3 0x0000000000bd2802 in write_ts_exp_tree_pointers (ob=0x20b4000,
expr=0x7ffff5d99ca0, ref_p=false)
at /space/rguenther/src/svn/trunk/gcc/tree-streamer-out.c:747
747 stream_write_tree (ob, TREE_BLOCK (expr), ref_p);
of an ADDR_EXPR:
(gdb) call debug_tree (expr)
<addr_expr 0x7ffff5d99ca0
type <pointer_type 0x7ffff69380a8
type <array_type 0x7ffff6938150 type <integer_type 0x7ffff6924930 char>
BLK
size <integer_cst 0x7ffff6917940 constant 88>
unit size <integer_cst 0x7ffff6917960 constant 11>
align 8 symtab 0 alias set -1 canonical type 0x7ffff69381f8 domain
<integer_type 0x7ffff69382a0>
pointer_to_this <pointer_type 0x7ffff69380a8>>
unsigned DI
size <integer_cst 0x7ffff67e2d20 constant 64>
unit size <integer_cst 0x7ffff67e2d40 constant 8>
align 64 symtab 0 alias set -1 canonical type 0x7ffff69380a8>
readonly constant
arg 0 <string_cst 0x7ffff5d99cc0 type <array_type 0x7ffff6938150>
readonly constant static "<lightred>\000">>
but it seems to have been collected.
The ADDR_EXPR is inside a CONSTRUCTOR which is created by switch-conversion:
<var_decl 0x7ffff316fab0 CSWTCH.1083
type <array_type 0x7ffff1112d20
type <pointer_type 0x7ffff65a5150 type <array_type 0x7ffff65a51f8>
unsigned DI
size <integer_cst 0x7ffff67e2d20 constant 64>
unit size <integer_cst 0x7ffff67e2d40 constant 8>
align 64 symtab 0 alias set -1 canonical type 0x7ffff69380a8>
BLK
size <integer_cst 0x7ffff6917900 constant 448>
unit size <integer_cst 0x7ffff6917b20 constant 56>
align 64 symtab 0 alias set -1 canonical type 0x7ffff1112d20
domain <integer_type 0x7ffff693e150 type <integer_type 0x7ffff67f3000
sizetype>
DI size <integer_cst 0x7ffff67e2d20 64> unit size <integer_cst
0x7ffff67e2d40 8>
align 64 symtab 0 alias set -1 canonical type 0x7ffff67f3738
precision 64 min <integer_cst 0x7ffff67e2d60 0> max <integer_cst 0x7ffff6917b40
6>>
pointer_to_this <pointer_type 0x7ffff0e8a150>>
readonly constant static BLK file output.cc line 1198 col 0 size
<integer_cst 0x7ffff6917900 448> unit size <integer_cst 0x7ffff6917b20 56>
align 256 initial <constructor 0x7ffff104f360>>
DECL_INITIAL is written via
322 /* Write any LTO-specific data to OB. */
323 if (DECL_P (expr)
324 && TREE_CODE (expr) != FUNCTION_DECL
325 && TREE_CODE (expr) != TRANSLATION_UNIT_DECL)
326 {
327 /* Handle DECL_INITIAL for symbols. */
328 tree initial = DECL_INITIAL (expr);
329 if (TREE_CODE (expr) == VAR_DECL
(gdb) l
330 && (TREE_STATIC (expr) || DECL_EXTERNAL (expr))
331 && !DECL_IN_CONSTANT_POOL (expr)
332 && initial)
333 {
334 lto_symtab_encoder_t encoder;
335 struct varpool_node *vnode;
336
337 encoder = ob->decl_state->symtab_node_encoder;
338 vnode = varpool_get_node (expr);
339 if (!vnode
...
so we seem to have an issue with BLOCKs being referenced from DECL_INITIALs
of decls we put into varpool. The case in question (switch-conversion)
may be the only way this happens, but who knows what frontends do here?
Btw, switch-conversion forgets to unshare the exprs as well.
