clang/test/Analysis/solver-sym-simplification-with-proper-range-type.c

   1 // RUN: %clang_analyze_cc1 %s \
   2 // RUN:   -analyzer-checker=core \
   3 // RUN:   -analyzer-checker=debug.ExprInspection \
   4 // RUN:   -verify
   5
   6 // Here we test that the range based solver equivalency tracking mechanism
   7 // assigns a properly typed range to the simplified symbol.
   8
   9 void clang_analyzer_printState(void);
  10 void clang_analyzer_eval(int);
  11
  12 void f(int a0, int b0, int c)
  13 {
  14     int a1 = a0 - b0;
  15     int b1 = (unsigned)a1 + c;
  16     if (c == 0) {
  17
  18         int d = 7L / b1; // ...
  19         // At this point b1 is considered non-zero, which results in a new
  20         // constraint for $a0 - $b0 + $c. The type of this sym is unsigned,
  21         // however, the simplified sym is $a0 - $b0 and its type is signed.
  22         // This is probably the result of the inherent improper handling of
  23         // casts. Anyway, Range assignment for constraints use this type
  24         // information. Therefore, we must make sure that first we simplify the
  25         // symbol and only then we assign the range.
  26
  27         clang_analyzer_eval(a0 - b0 != 0); // expected-warning{{TRUE}}
  28     }
  29 }