{"action":"created","comment":{"url":"https://api.github.com/repos/diffblue/cbmc/pulls/comments/198745305","pull_request_review_id":132729499,"id":198745305,"node_id":"MDI0OlB1bGxSZXF1ZXN0UmV2aWV3Q29tbWVudDE5ODc0NTMwNQ==","diff_hunk":"@@ -45,7 +45,9 @@ exprt string_constraint_generatort::add_axioms_for_equals(\n \n   symbol_exprt qvar=fresh_univ_index(\"QA_equal\", index_type);\n   string_constraintt a2(\n-    qvar, s1.length(), implies_exprt(eq, equal_exprt(s1[qvar], s2[qvar])));\n+    qvar,\n+    zero_if_negative(s1.length()),\n+    implies_exprt(eq, equal_exprt(s1[qvar], s2[qvar])));\n   constraints.push_back(a2);","path":"src/solvers/refinement/string_constraint_generator_comparison.cpp","position":null,"original_position":8,"commit_id":"aa5c8dfc952f9f33f6d1bb4efec388e82cec89b7","original_commit_id":"9685b0f2a709947e32660f8f1cdd8f1f098f30d9","user":{"login":"allredj","id":25150403,"node_id":"MDQ6VXNlcjI1MTUwNDAz","avatar_url":"https://avatars3.githubusercontent.com/u/25150403?v=4","gravatar_id":"","url":"https://api.github.com/users/allredj","html_url":"https://github.com/allredj","followers_url":"https://api.github.com/users/allredj/followers","following_url":"https://api.github.com/users/allredj/following{/other_user}","gists_url":"https://api.github.com/users/allredj/gists{/gist_id}","starred_url":"https://api.github.com/users/allredj/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/allredj/subscriptions","organizations_url":"https://api.github.com/users/allredj/orgs","repos_url":"https://api.github.com/users/allredj/repos","events_url":"https://api.github.com/users/allredj/events{/privacy}","received_events_url":"https://api.github.com/users/allredj/received_events","type":"User","site_admin":false},"body":"Encapsulated all three lemmas and constraint additions in this method. I will keep that in mind if I modify further constraints.","created_at":"2018-06-28T08:13:38Z","updated_at":"2018-06-28T08:13:38Z","html_url":"https://github.com/diffblue/cbmc/pull/2489#discussion_r198745305","pull_request_url":"https://api.github.com/repos/diffblue/cbmc/pulls/2489","author_association":"CONTRIBUTOR","_links":{"self":{"href":"https://api.github.com/repos/diffblue/cbmc/pulls/comments/198745305"},"html":{"href":"https://github.com/diffblue/cbmc/pull/2489#discussion_r198745305"},"pull_request":{"href":"https://api.github.com/repos/diffblue/cbmc/pulls/2489"}},"in_reply_to_id":198588148},"pull_request":{"url":"https://api.github.com/repos/diffblue/cbmc/pulls/2489","id":197787226,"node_id":"MDExOlB1bGxSZXF1ZXN0MTk3Nzg3MjI2","html_url":"https://github.com/diffblue/cbmc/pull/2489","diff_url":"https://github.com/diffblue/cbmc/pull/2489.diff","patch_url":"https://github.com/diffblue/cbmc/pull/2489.patch","issue_url":"https://api.github.com/repos/diffblue/cbmc/issues/2489","number":2489,"state":"open","locked":false,"title":"[TG-3912] Sanitize string_constraintt bounds","user":{"login":"allredj","id":25150403,"node_id":"MDQ6VXNlcjI1MTUwNDAz","avatar_url":"https://avatars3.githubusercontent.com/u/25150403?v=4","gravatar_id":"","url":"https://api.github.com/users/allredj","html_url":"https://github.com/allredj","followers_url":"https://api.github.com/users/allredj/followers","following_url":"https://api.github.com/users/allredj/following{/other_user}","gists_url":"https://api.github.com/users/allredj/gists{/gist_id}","starred_url":"https://api.github.com/users/allredj/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/allredj/subscriptions","organizations_url":"https://api.github.com/users/allredj/orgs","repos_url":"https://api.github.com/users/allredj/repos","events_url":"https://api.github.com/users/allredj/events{/privacy}","received_events_url":"https://api.github.com/users/allredj/received_events","type":"User","site_admin":false},"body":"When adding string constraints, we sometimes allowed for bounds to be negative, which could mess up the subsequent refinement process (some index sets would find themselves in an inconsistent state).\r\n\r\nWe now enforce, via a sat check, that `string_constraintt`s are not created with negative bounds.\r\n\r\nAbout the lack of tests in this PR:\r\nI have not managed to actually find a reproducible example where this lead to an error in jbmc, however there are strong suspicions that this problem contributed to other bugs that we are observing (but which still occur).\r\nSo the best I could do for now is to put down a couple of assertions in the `string_constraintt` constructor, which triggered a large number of failures in our current regression tests. These have been fixed and these tests passing ensure that we no longer have negative bounds in 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