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Warn when ana.opt.hashcons is disabled but implicitly overridden #1921

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Warn when ana.opt.hashcons is disabled but implicitly overridden #1921

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4e2998e
Initial plan
Copilot Jan 20, 2026
6f83ac0
Add warning when hashconsing is force-enabled
Copilot Jan 20, 2026
a1f285d
Add test for hashcons warning
Copilot Jan 20, 2026
cffdb82
Fix missing semicolon in warning logic
Copilot Jan 20, 2026
6727019
Final: Complete implementation with warnings
Copilot Jan 20, 2026
88c9ac6
Move hashcons warning to check_arguments in maingoblint.ml
Copilot Jan 20, 2026
daa36fb
Remove tests as they are not needed
Copilot Jan 20, 2026
004be4c
Remove _codeql_detected_source_root file
Copilot Jan 20, 2026
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7 changes: 4 additions & 3 deletions src/framework/control.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@ let spec_module: (module Spec) Lazy.t = lazy (
GobConfig.building_spec := true;
let arg_enabled = get_bool "exp.arg.enabled" in
let termination_enabled = List.mem "termination" (get_string_list "ana.activated") in (* check if loop termination analysis is enabled*)
let hashcons_enabled = get_bool "ana.opt.hashcons" in
(* apply functor F on module X if opt is true *)
let lift opt (module F : S2S) (module X : Spec) = (module (val if opt then (module F (X)) else (module X) : Spec) : Spec) in
let module S1 =
Expand All @@ -29,16 +30,16 @@ let spec_module: (module Spec) Lazy.t = lazy (
|> lift true (module WidenContextLifterSide) (* option checked in functor *)
|> lift (get_int "ana.widen.delay.local" > 0) (module WideningDelay.DLifter)
(* hashcons before witness to reduce duplicates, because witness re-uses contexts in domain and requires tag for PathSensitive3 *)
|> lift (get_bool "ana.opt.hashcons" || arg_enabled) (module HashconsContextLifter)
|> lift (hashcons_enabled || arg_enabled) (module HashconsContextLifter)
|> lift (get_bool "ana.opt.hashcached") (module HashCachedContextLifter)
|> lift arg_enabled (module HashconsLifter)
|> lift arg_enabled (module ArgConstraints.PathSensitive3)
|> lift (not arg_enabled) (module PathSensitive2)
|> lift (get_bool "ana.dead-code.branches") (module DeadBranchLifter)
|> lift true (module DeadCodeLifter)
|> lift (get_bool "dbg.slice.on") (module LevelSliceLifter)
|> lift (get_bool "ana.opt.equal" && not (get_bool "ana.opt.hashcons")) (module OptEqual)
|> lift (get_bool "ana.opt.hashcons") (module HashconsLifter)
|> lift (get_bool "ana.opt.equal" && not hashcons_enabled) (module OptEqual)
|> lift hashcons_enabled (module HashconsLifter)
(* Widening tokens must be outside of hashcons, because widening token domain ignores token sets for identity, so hashcons doesn't allow adding tokens.
Also must be outside of deadcode, because deadcode splits (like mutex lock event) don't pass on tokens. *)
|> lift (get_bool "ana.widen.tokens") (module WideningTokenLifter.Lifter)
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6 changes: 6 additions & 0 deletions src/maingoblint.ml
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Expand Up @@ -136,6 +136,12 @@ let check_arguments () =
if get_bool "ana.autotune.enabled" && get_bool "incremental.load" then (set_bool "ana.autotune.enabled" false; warn "ana.autotune.enabled implicitly disabled by incremental.load");
if get_bool "exp.basic-blocks" && not (get_bool "justcil") && List.mem "assert" @@ get_string_list "trans.activated" then (set_bool "exp.basic-blocks" false; warn "The option exp.basic-blocks implicitly disabled by activating the \"assert\" transformation.");
if (not @@ get_bool "witness.invariant.all-locals") && (not @@ get_bool "cil.addNestedScopeAttr") then (set_bool "cil.addNestedScopeAttr" true; warn "Disabling witness.invariant.all-locals implicitly enables cil.addNestedScopeAttr.");
if not (get_bool "ana.opt.hashcons") then (
if get_bool "exp.arg.enabled" then
warn "Disabling ana.opt.hashcons has no effect because hashconsing is implicitly enabled by exp.arg.enabled";
if List.mem "apron" (get_string_list "ana.activated") then
warn "Disabling ana.opt.hashcons has no effect because hashconsing is implicitly enabled by Apron (ana.activated includes 'apron')";
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@sim642 sim642 Jan 21, 2026

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I don't think this is true: the hashconsing functors in Control don't check anything Apron-related, nor is ana.opt.hashcons referenced anywere else that tries to do such implicit enabling.
#1657 (comment) sounds like Apron would just crash in this case.

This should be checked and if I'm correct, then it could be a fail instead of warn.

);
if List.mem "remove_dead_code" @@ get_string_list "trans.activated" then (
(* 'assert' transform happens before 'remove_dead_code' transform *)
ignore @@ List.fold_left
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