[llvm-bugs] [Bug 25078] New: [Analyzer] Assertion "System is over constrained" after truncating 64 bits integers to 32 bits.

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25078

            Bug ID: 25078
           Summary: [Analyzer] Assertion "System is over constrained"
                    after truncating 64 bits integers to 32 bits.
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Static Analyzer
          Assignee: kremenek at apple.com
          Reporter: pierregousseau14 at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 15014
  --> https://llvm.org/bugs/attachment.cgi?id=15014&action=edit
test case

clang version: trunk @248379

Given the following test case:

  void f1(long foo)
  {
    unsigned index = -1;
    if (index < foo) index = foo;
    if (index + 1 == 0) // -> "system over constrained" assertion
      clang_analyzer_warnIfReached(); // -> never reached but should be
    else
      clang_analyzer_warnIfReached();
  }


A "System is over constrained" assertion is triggered with debug builds:

$ clang -cc1 -triple x86_64-pc-linux -analyze
-analyzer-checker=core,debug.ExprInspection test.cpp
clang:
../tools/clang/include/clang/StaticAnalyzer/Core/PathSensitive/ConstraintManager.h:86:
clang::ento::ConstraintManager::ProgramStatePair
clang::ento::ConstraintManager::assumeDual(clang::ento::ProgramStateRef,
clang::ento::DefinedSVal): Assertion `assume(State, Cond, false) && "System is
over constrained."' failed.

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