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Add more tracing code to trans for refcount events.

This commit is contained in:
Graydon Hoare 2010-07-12 13:11:14 -07:00
parent b172862d21
commit 314b906679
1 changed files with 26 additions and 7 deletions
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33
src/boot/me/trans.ml
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@ -2453,9 +2453,8 @@ let trans_visitor
note_drop_step ty "drop_ty: obj path";
let binding = get_element_ptr cell Abi.binding_field_binding in
let null_jmp = null_check binding in
let rc_jmp = drop_refcount_and_cmp binding in
let obj = deref binding in
let rc = get_element_ptr obj 0 in
let rc_jmp = drop_refcount_and_cmp rc in
let tydesc = get_element_ptr obj 1 in
let body = get_element_ptr obj 2 in
let ty_params =
@ -2505,8 +2504,7 @@ let trans_visitor
let _ = check_box_rty cell in
let null_jmp = null_check cell in
let rc = box_rc_cell cell in
let j = drop_refcount_and_cmp rc in
let j = drop_refcount_and_cmp cell in
(* FIXME (issue #25): check to see that the box has
* further box members; if it doesn't we can elide the
@ -2525,7 +2523,7 @@ let trans_visitor
note_drop_step ty "drop_ty: done box-drop path";
| MEM_interior when type_is_structured ty ->
note_drop_step ty "drop:ty structured-interior path";
note_drop_step ty "drop_ty structured-interior path";
iter_ty_parts ty_params cell ty
(drop_ty ty_params) curr_iso;
note_drop_step ty "drop_ty: done structured-interior path";
@ -2740,14 +2738,35 @@ let trans_visitor
emit (Il.jmp Il.JE Il.CodeNone);
j
and drop_refcount_and_cmp (rc:Il.cell) : quad_idx =
and drop_refcount_and_cmp (boxed:Il.cell) : quad_idx =
iflog (fun _ -> annotate "drop refcount and maybe free");
let rc = box_rc_cell boxed in
if cx.ctxt_sess.Session.sess_trace_gc ||
cx.ctxt_sess.Session.sess_trace_drop
then
begin
trace_str true "refcount--";
trace_word true boxed;
trace_word true rc
end;
emit (Il.binary Il.SUB rc (Il.Cell rc) one);
emit (Il.cmp (Il.Cell rc) zero);
let j = mark () in
emit (Il.jmp Il.JNE Il.CodeNone);
j
and incr_refcount (boxed:Il.cell) : unit =
let rc = box_rc_cell boxed in
if cx.ctxt_sess.Session.sess_trace_gc ||
cx.ctxt_sess.Session.sess_trace_drop
then
begin
trace_str true "refcount++";
trace_word true boxed;
trace_word true rc
end;
add_to rc one
and drop_slot
(ty_params:Il.cell)
(cell:Il.cell)
@ -2917,7 +2936,7 @@ let trans_visitor
| (MEM_rc_struct, MEM_rc_struct) ->
(* Lightweight copy: twiddle refcounts, move pointer. *)
anno "refcounted light";
add_to (box_rc_cell src) one;
incr_refcount src;
if not initializing
then
drop_ty ty_params dst dst_ty None;