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Create a fixed name for the while loop counter (loop_ctr) #47

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Create a fixed name for the while loop counter (loop_ctr) #47

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a0049fe
Create a fixed name for the while loop counter (loop_ctr)
parno Dec 8, 2020
9707738
Merge branch 'master' into loop_counter
yizhou7 Apr 16, 2021
c7c9375
Merge branch 'master' into loop_counter
yizhou7 Oct 14, 2021
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2 changes: 1 addition & 1 deletion tools/Vale/src/emit_common_lemmas.fs
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Expand Up @@ -255,7 +255,7 @@ let rec build_lemma_stmt (senv:stmt_env) (s:stmt):ghost * bool * stmt list =
let codeBody = vaApp "get_whileBody" [code] in
let i1 = string (gen_lemma_sym ()) in
let i2 = string (gen_lemma_sym ()) in
let (n1, s1, sw1, fw1) = (Reserved ("n" + i1), Reserved ("s" + i1), Reserved ("sW" + i1), Reserved ("fW" + i1)) in
let (n1, s1, sw1, fw1) = (Id "loop_ctr", Reserved ("s" + i1), Reserved ("sW" + i1), Reserved ("fW" + i1)) in
let (sw2, fw2) = (Reserved ("sW" + i2), Reserved ("fW" + i2)) in
let (codeCond, codeBody, sCodeVars) =
if !fstar then
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2 changes: 1 addition & 1 deletion tools/Vale/src/emit_dafny_text.fs
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Expand Up @@ -149,7 +149,7 @@ let rec emit_stmt (ps:print_state) (s:stmt):unit =
ps.PrintLine ("ghost var " + (String.concat ", " (List.map string_of_lhs_formal lhss)) + " := " + (string_of_exp e) + ";")
| SAssign _ -> emit_stmts ps (eliminate_assign_lhss s)
| SLetUpdates _ -> internalErr "SLetUpdates"
| SBlock ss -> notImplemented "block"
| SBlock ss -> emit_block ps ss
| SIfElse (_, e, ss1, []) ->
ps.PrintLine ("if (" + (string_of_exp e) + ")");
emit_block ps ss1
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1 change: 1 addition & 0 deletions tools/Vale/src/typechecker.fs
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Expand Up @@ -1931,6 +1931,7 @@ let rec tc_stmt (env:env) (s:stmt):stmt =
SIfElse (g, e, b1, b2)
| SWhile (e, invs, ed, b) ->
let (t, e) = tc_exp env e (Some tBool) in
let env = push_id env (Id "loop_ctr") (TInt (NegInf, Inf)) in
let invs = List_mapSnd (fun e -> let (_, e) = tc_exp env e (Some tProp) in e) invs in
let ed = mapSnd (List.map (fun e -> let (_, e) = tc_exp env e None in e)) ed in
let (_, b) = tc_stmts env b in
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