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Numerous bug fixes to typestate algorithm.

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This commit is contained in:
Graydon Hoare 2010-07-06 23:18:29 -07:00
parent d3cfbdaddd
commit e813388df8
3 changed files with 139 additions and 83 deletions
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199
src/boot/me/typestate.ml
View File

@ -304,6 +304,11 @@ let condition_assigning_visitor
raise_bits bitv keys
in
let raise_pre_post_cond (id:node_id) (keys:constr_key array) : unit =
raise_precondition id keys;
raise_postcondition id keys;
in
let resolve_constr_to_key
(formal_base:node_id option)
(constr:Ast.constr)
@ -355,7 +360,7 @@ let condition_assigning_visitor
inner.Walk.visit_obj_drop_pre obj b
in
let visit_callable_pre s dst lv args =
let visit_callable_pre id dst_slot_ids lv args =
let referent_ty = lval_ty cx lv in
begin
match referent_ty with
@ -376,15 +381,13 @@ let condition_assigning_visitor
slot_inits (atom_slots cx arg))
args))
in
raise_precondition s.id arg_init_keys;
raise_precondition s.id constr_keys
raise_pre_post_cond id arg_init_keys;
raise_pre_post_cond id constr_keys
| _ -> ()
end;
begin
let postcond =
slot_inits (lval_slots cx dst)
in
raise_postcondition s.id postcond
let postcond = slot_inits dst_slot_ids in
raise_postcondition id postcond
end
in
@ -398,7 +401,7 @@ let condition_assigning_visitor
| Ast.STMT_recv (dst, src) ->
let precond = slot_inits (lval_slots cx src) in
let postcond = slot_inits (lval_slots cx dst) in
raise_precondition s.id precond;
raise_pre_post_cond s.id precond;
raise_postcondition s.id postcond
| Ast.STMT_send (dst, src) ->
@ -406,7 +409,7 @@ let condition_assigning_visitor
(slot_inits (lval_slots cx dst))
(slot_inits (lval_slots cx src))
in
raise_precondition s.id precond;
raise_pre_post_cond s.id precond;
| Ast.STMT_init_rec (dst, entries, base) ->
let base_slots =
@ -420,7 +423,7 @@ let condition_assigning_visitor
(Array.append (rec_inputs_slots cx entries) base_slots)
in
let postcond = slot_inits (lval_slots cx dst) in
raise_precondition s.id precond;
raise_pre_post_cond s.id precond;
raise_postcondition s.id postcond
| Ast.STMT_init_tup (dst, modes_atoms) ->
@ -428,13 +431,13 @@ let condition_assigning_visitor
(tup_inputs_slots cx modes_atoms)
in
let postcond = slot_inits (lval_slots cx dst) in
raise_precondition s.id precond;
raise_pre_post_cond s.id precond;
raise_postcondition s.id postcond
| Ast.STMT_init_vec (dst, atoms) ->
let precond = slot_inits (atoms_slots cx atoms) in
let postcond = slot_inits (lval_slots cx dst) in
raise_precondition s.id precond;
raise_pre_post_cond s.id precond;
raise_postcondition s.id postcond
| Ast.STMT_init_str (dst, _) ->
@ -448,59 +451,59 @@ let condition_assigning_visitor
| Ast.STMT_init_chan (dst, port) ->
let precond = slot_inits (lval_option_slots cx port) in
let postcond = slot_inits (lval_slots cx dst) in
raise_precondition s.id precond;
raise_pre_post_cond s.id precond;
raise_postcondition s.id postcond
| Ast.STMT_init_box (dst, src) ->
let precond = slot_inits (atom_slots cx src) in
let postcond = slot_inits (lval_slots cx dst) in
raise_precondition s.id precond;
raise_pre_post_cond s.id precond;
raise_postcondition s.id postcond
| Ast.STMT_copy (dst, src) ->
let precond = slot_inits (expr_slots cx src) in
let postcond = slot_inits (lval_slots cx dst) in
raise_precondition s.id precond;
raise_pre_post_cond s.id precond;
raise_postcondition s.id postcond
| Ast.STMT_copy_binop (dst, _, src) ->
let dst_init = slot_inits (lval_slots cx dst) in
let src_init = slot_inits (atom_slots cx src) in
let precond = Array.append dst_init src_init in
raise_precondition s.id precond;
raise_pre_post_cond s.id precond;
| Ast.STMT_spawn (dst, _, lv, args)
| Ast.STMT_call (dst, lv, args) ->
visit_callable_pre s dst lv args
visit_callable_pre s.id (lval_slots cx dst) lv args
| Ast.STMT_bind (dst, lv, args_opt) ->
let args = arr_map_partial args_opt (fun a -> a) in
visit_callable_pre s dst lv args
visit_callable_pre s.id (lval_slots cx dst) lv args
| Ast.STMT_ret (Some at) ->
let precond = slot_inits (atom_slots cx at) in
raise_precondition s.id precond
raise_pre_post_cond s.id precond
| Ast.STMT_put (Some at) ->
let precond = slot_inits (atom_slots cx at) in
raise_precondition s.id precond
raise_pre_post_cond s.id precond
| Ast.STMT_join lval ->
let precond = slot_inits (lval_slots cx lval) in
raise_precondition s.id precond
raise_pre_post_cond s.id precond
| Ast.STMT_log atom ->
let precond = slot_inits (atom_slots cx atom) in
raise_precondition s.id precond
raise_pre_post_cond s.id precond
| Ast.STMT_check_expr expr ->
let precond = slot_inits (expr_slots cx expr) in
raise_precondition s.id precond
raise_pre_post_cond s.id precond
| Ast.STMT_while sw ->
let (_, expr) = sw.Ast.while_lval in
let precond = slot_inits (expr_slots cx expr) in
raise_precondition s.id precond
raise_pre_post_cond s.id precond
| Ast.STMT_alt_tag at ->
let precond = slot_inits (lval_slots cx at.Ast.alt_tag_lval) in
@ -519,17 +522,21 @@ let condition_assigning_visitor
in
raise_entry_state input_keys init_keys block
in
raise_precondition s.id precond;
raise_pre_post_cond s.id precond;
Array.iter visit_arm at.Ast.alt_tag_arms
| Ast.STMT_for_each fe ->
let (si, _) = fe.Ast.for_each_slot in
let block_entry_state = [| Constr_init si.id |] in
raise_postcondition fe.Ast.for_each_body.id block_entry_state
let (callee, args) = fe.Ast.for_each_call in
visit_callable_pre
fe.Ast.for_each_body.id [| si.id |] callee args
| Ast.STMT_for fo ->
let (si, _) = fo.Ast.for_slot in
let (_, lval) = fo.Ast.for_seq in
let precond = slot_inits (lval_slots cx lval) in
let block_entry_state = [| Constr_init si.id |] in
raise_pre_post_cond s.id precond;
raise_postcondition fo.Ast.for_body.id block_entry_state
| _ -> ()
@ -569,11 +576,20 @@ let lset_fmt lset =
"]"
;;
let show_node cx graph s i =
iflog cx
(fun _ ->
log cx "node '%s' = %d -> %s"
s (int_of_node i) (lset_fmt (Hashtbl.find graph i)))
;;
type node_graph = (node_id, (node_id list)) Hashtbl.t;;
type sibling_map = (node_id, node_id) Hashtbl.t;;
let graph_sequence_building_visitor
(cx:ctxt)
(graph:node_graph)
(sibs:sibling_map)
(inner:Walk.visitor)
: Walk.visitor =
@ -586,7 +602,8 @@ let graph_sequence_building_visitor
let next = stmts.(i+1) in
log cx "sequential stmt edge %d -> %d"
(int_of_node stmt.id) (int_of_node next.id);
htab_put graph stmt.id [next.id]
htab_put graph stmt.id [next.id];
htab_put sibs stmt.id next.id;
done;
(* Flow last node to nowhere. *)
if len > 0
@ -643,8 +660,9 @@ let last_id_or_block_id (block:Ast.block) : node_id =
;;
let graph_general_block_structure_building_visitor
((*cx*)_:ctxt)
(cx:ctxt)
(graph:node_graph)
(sibs:sibling_map)
(inner:Walk.visitor)
: Walk.visitor =
@ -660,20 +678,14 @@ let graph_general_block_structure_building_visitor
ignore (Stack.pop stmts)
in
let show_node = show_node cx graph in
let visit_block_pre b =
begin
let len = Array.length b.node in
(* Flow container-stmt to block, save existing out-edges for below. *)
let dsts =
if Stack.is_empty stmts
then []
else
let s = Stack.top stmts in
let dsts = Hashtbl.find graph s.id in
add_flow_edges graph s.id [b.id];
dsts
in
let len = Array.length b.node in
let _ = htab_put graph b.id
(if len > 0 then [b.node.(0).id] else [])
in
(*
* If block has len,
@ -690,16 +702,21 @@ let graph_general_block_structure_building_visitor
* block#n -> stmt#0 -> ... -> stmt#k -> stmt#j
*
*)
if len > 0
then
begin
htab_put graph b.id [b.node.(0).id];
add_flow_edges graph (last_id b.node) dsts
end
else
htab_put graph b.id dsts
if Stack.is_empty stmts
then ()
else
let s = Stack.top stmts in
add_flow_edges graph s.id [b.id];
match htab_search sibs s.id with
None -> ()
| Some sib_id ->
if len > 0
then
add_flow_edges graph (last_id b.node) [sib_id]
else
add_flow_edges graph b.id [sib_id]
end;
show_node "block" b.id;
inner.Walk.visit_block_pre b
in
@ -724,12 +741,7 @@ let graph_special_block_structure_building_visitor
let cond_id = s.id in
let then_id = sif.Ast.if_then.id in
let then_end_id = last_id_or_block_id sif.Ast.if_then in
let show_node s i =
iflog cx
(fun _ ->
log cx "node '%s' = %d -> %s"
s (int_of_node i) (lset_fmt (Hashtbl.find graph i)))
in
let show_node = show_node cx graph in
show_node "initial cond" cond_id;
show_node "initial then" then_id;
show_node "initial then_end" then_end_id;
@ -834,7 +846,7 @@ let find_roots
roots
;;
let run_dataflow cx graph : unit =
let run_dataflow cx idref graph : unit =
let roots = find_roots graph in
let nodes = Queue.create () in
let progress = ref true in
@ -857,42 +869,62 @@ let run_dataflow cx graph : unit =
iflog cx (fun _ -> log cx
"made progress intersecting bits"))
in
let raise_bits dst src =
if Bits.union dst src
then (progress := true;
iflog cx (fun _ -> log cx
"made progress unioning bits"))
in
let iter = ref 0 in
let written = Hashtbl.create 0 in
let tmp_diff = (Bits.create (!idref) false) in
let tmp_poststate = (Bits.create (!idref) false) in
Hashtbl.iter (fun n _ -> Queue.push n nodes) roots;
while !progress do
incr iter;
progress := false;
iflog cx (fun _ -> log cx "dataflow pass %d" (!iter));
iflog cx (fun _ ->
log cx "";
log cx "--------------------";
log cx "dataflow pass %d" (!iter));
Queue.iter
begin
fun node ->
let prestate = Hashtbl.find cx.ctxt_prestates node in
let precond = Hashtbl.find cx.ctxt_preconditions node in
let postcond = Hashtbl.find cx.ctxt_postconditions node in
let poststate = Hashtbl.find cx.ctxt_poststates node in
iflog cx (fun _ -> log cx "stmt %d: '%s'" (int_of_node node)
(match htab_search cx.ctxt_all_stmts node with
None -> "??"
| Some stmt -> Fmt.fmt_to_str Ast.fmt_stmt stmt));
iflog cx (fun _ -> log cx "stmt %d:" (int_of_node node));
iflog cx (fun _ -> log cx
" prestate %s" (fmt_constr_bitv prestate));
raise_bits poststate prestate;
raise_bits poststate postcond;
iflog cx (fun _ -> log cx
" poststate %s" (fmt_constr_bitv poststate));
Bits.clear tmp_poststate;
ignore (Bits.union tmp_poststate prestate);
ignore (Bits.union tmp_poststate precond);
ignore (Bits.union tmp_poststate postcond);
ignore (Bits.copy tmp_diff precond);
ignore (Bits.difference tmp_diff postcond);
ignore (Bits.difference tmp_poststate tmp_diff);
iflog cx
begin
fun _ ->
log cx "stmt %d: '%s'" (int_of_node node)
(match htab_search cx.ctxt_all_stmts node with
None -> "??"
| Some stmt -> Fmt.fmt_to_str Ast.fmt_stmt stmt);
log cx "stmt %d:" (int_of_node node);
log cx " prestate %s" (fmt_constr_bitv prestate);
log cx " precond %s" (fmt_constr_bitv precond);
log cx " postcond %s" (fmt_constr_bitv postcond);
log cx " poststate %s" (fmt_constr_bitv poststate);
log cx
" precond - postcond %s" (fmt_constr_bitv tmp_diff);
log cx
" new poststate %s" (fmt_constr_bitv tmp_poststate)
end;
set_bits poststate tmp_poststate;
Hashtbl.replace written node ();
let successors = Hashtbl.find graph node in
let i = int_of_node node in
iflog cx (fun _ -> log cx
"out-edges for %d: %s" i (lset_fmt successors));
List.iter
let successors = Hashtbl.find graph node in
let i = int_of_node node in
iflog cx (fun _ -> log cx
"out-edges for %d: %s" i (lset_fmt successors));
List.iter
begin
fun succ ->
let succ_prestates =
@ -1107,6 +1139,7 @@ let process_crate
let (scopes:(scope list) ref) = ref [] in
let constr_id = ref 0 in
let (graph:(node_id, (node_id list)) Hashtbl.t) = Hashtbl.create 0 in
let sibs = Hashtbl.create 0 in
let setup_passes =
[|
(scope_stack_managing_visitor scopes
@ -1117,9 +1150,9 @@ let process_crate
(scope_stack_managing_visitor scopes
(condition_assigning_visitor cx scopes
Walk.empty_visitor));
(graph_sequence_building_visitor cx graph
(graph_sequence_building_visitor cx graph sibs
Walk.empty_visitor);
(graph_general_block_structure_building_visitor cx graph
(graph_general_block_structure_building_visitor cx graph sibs
Walk.empty_visitor);
(graph_special_block_structure_building_visitor cx graph
Walk.empty_visitor);
@ -1139,7 +1172,7 @@ let process_crate
|]
in
run_passes cx "typestate setup" path setup_passes (log cx "%s") crate;
run_dataflow cx graph;
run_dataflow cx constr_id graph;
run_passes cx "typestate verify" path verify_passes (log cx "%s") crate;
run_passes cx "typestate aux" path aux_passes (log cx "%s") crate
;;

9
src/boot/util/bits.ml
View File

@ -67,6 +67,15 @@ let invert (v:t) : unit =
done
;;
(* dst = dst - src *)
let difference (dst:t) (src:t) : bool =
invert src;
let b = intersect dst src in
invert src;
b
;;
let set (v:t) (i:int) (x:bool) : unit =
assert (i >= 0);
assert (i < v.nbits);

14
src/test/compile-fail/use-uninit.rs Normal file
View File

@ -0,0 +1,14 @@
// error-pattern:Unsatisfied precondition
fn foo(int x) {
log x;
}
fn main() {
let int x;
if (1 > 2) {
x = 10;
} else {
}
foo(x);
}