From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 411963858C00; Sun, 19 Mar 2023 16:01:34 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 411963858C00 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1679241694; bh=HGgbiUvZFMY1UA4b2vmcQwj7az7I2s2r+qfZjVREqMs=; h=From:To:Subject:Date:From; b=Pp2Cv0Gpws+rCbZZ4yUBGlhLjs5h7RL7kIRqxIsZp4Li8IHUMcEQbt7YvjpbpnWSw opOEJOogeAqUixeAtL3YRvDal4+fGlPLPX7sz5g81c3httwEGLxdkAAE53hQwjF12Y tBn+Vs7DE6OB2kGikPYy4LGWVypO7gYniStBdwkk= From: "geoffreydgr at icloud dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug analyzer/109196] New: GSA evaluates `__analyzer_eval(((a())<(0))||((a())==(0)));` to be TRUE, but function `a()` is a unknown function Date: Sun, 19 Mar 2023 16:01:33 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: analyzer X-Bugzilla-Version: 13.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: geoffreydgr at icloud dot com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: dmalcolm at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status bug_severity priority component assigned_to reporter target_milestone Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109196 Bug ID: 109196 Summary: GSA evaluates `__analyzer_eval(((a())<(0))||((a())=3D=3D(0)));` to be TRUE, but function `a()` is a unknown function Product: gcc Version: 13.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: analyzer Assignee: dmalcolm at gcc dot gnu.org Reporter: geoffreydgr at icloud dot com Target Milestone: --- GSA evaluates `__analyzer_eval(((a())<(0))||((a())=3D=3D(0)));` to be TRUE,= but function `a()` is a unknown function. But if I delete `for(;;)`, every evaluation expression is evaluated to be UNKNOWN. See it live: https://godbolt.org/z/7e5bKdvde , https://godbolt.org/z/sj4bq= 4Krx Input: ```c #include "stdint.h" #include int a();=20 uint16_t b() { for(;;) if (a() <=3D 0) { __analyzer_eval((a() <=3D 0)=3D=3Dtrue); __analyzer_eval(((a())<(0))||((a())=3D=3D(0))); __analyzer_eval(((a())+0)<=3D((0)+0)); __analyzer_eval(((a())+0)<=3D((0)+1)); __analyzer_eval(((a())+1)<=3D((0)+1)); __analyzer_eval(((a())+0)<=3D((0)+2)); __analyzer_eval(((a())+1)<=3D((0)+2)); __analyzer_eval(((a())+2)<=3D((0)+2)); __analyzer_eval(((a())-0)<=3D((0)-0)); __analyzer_eval((!(a() <=3D 0))=3D=3Dfalse); __analyzer_eval((((a())>=3D(0))&&((a())!=3D(0)))=3D=3Dfalse); __analyzer_eval(true); ; } } ``` Output: ``` : In function 'b': :9:7: warning: UNKNOWN 9 | __analyzer_eval((a() <=3D 0)=3D=3Dtrue); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ :10:7: warning: TRUE 10 | __analyzer_eval(((a())<(0))||((a())=3D=3D(0))); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ :11:7: warning: UNKNOWN 11 | __analyzer_eval(((a())+0)<=3D((0)+0)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ :12:7: warning: UNKNOWN 12 | __analyzer_eval(((a())+0)<=3D((0)+1)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ :13:7: warning: UNKNOWN 13 | __analyzer_eval(((a())+1)<=3D((0)+1)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ :14:7: warning: UNKNOWN 14 | __analyzer_eval(((a())+0)<=3D((0)+2)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ :15:7: warning: UNKNOWN 15 | __analyzer_eval(((a())+1)<=3D((0)+2)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ :16:7: warning: UNKNOWN 16 | __analyzer_eval(((a())+2)<=3D((0)+2)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ :17:7: warning: UNKNOWN 17 | __analyzer_eval(((a())-0)<=3D((0)-0)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ :18:7: warning: UNKNOWN 18 | __analyzer_eval((!(a() <=3D 0))=3D=3Dfalse); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ :19:7: warning: FALSE 19 | __analyzer_eval((((a())>=3D(0))&&((a())!=3D(0)))=3D=3Dfalse); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ :20:7: warning: TRUE 20 | __analyzer_eval(true); | ^~~~~~~~~~~~~~~~~~~~~ :10:7: warning: UNKNOWN 10 | __analyzer_eval(((a())<(0))||((a())=3D=3D(0))); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ :11:7: warning: UNKNOWN 11 | __analyzer_eval(((a())+0)<=3D((0)+0)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ :12:7: warning: UNKNOWN 12 | __analyzer_eval(((a())+0)<=3D((0)+1)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ :13:7: warning: UNKNOWN 13 | __analyzer_eval(((a())+1)<=3D((0)+1)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ :14:7: warning: UNKNOWN 14 | __analyzer_eval(((a())+0)<=3D((0)+2)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ :15:7: warning: UNKNOWN 15 | __analyzer_eval(((a())+1)<=3D((0)+2)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ :16:7: warning: UNKNOWN 16 | __analyzer_eval(((a())+2)<=3D((0)+2)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ :17:7: warning: UNKNOWN 17 | __analyzer_eval(((a())-0)<=3D((0)-0)); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ :18:7: warning: UNKNOWN 18 | __analyzer_eval((!(a() <=3D 0))=3D=3Dfalse); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ :19:7: warning: UNKNOWN 19 | __analyzer_eval((((a())>=3D(0))&&((a())!=3D(0)))=3D=3Dfalse); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ :20:7: warning: TRUE 20 | __analyzer_eval(true); | ^~~~~~~~~~~~~~~~~~~~~ Compiler returned: 0 ```=