gcc/testsuite/c-c++-common/analyzer/loop-start-down-to-end-by-1.c

   1 #include "../../gcc.dg/analyzer/analyzer-decls.h"
   2
   3 void test(int start, int end, int step)
   4 {
   5   int i;
   6
   7   __analyzer_dump_exploded_nodes (0); /* { dg-warning "1 processed enode" } */
   8
   9   for (i = start; i > end; i --) {
  10       __analyzer_eval (i > end); /* { dg-warning "TRUE" "true" } */
  11       /* { dg-bogus "UNKNOWN" "unknown" { xfail *-*-* } .-1 } */
  12       /* TODO(xfail^^^): should report TRUE twice. */
  13
  14       __analyzer_eval (i == start); /* { dg-warning "TRUE" "1st" } */
  15       /* { dg-warning "FALSE" "2nd" { xfail *-*-* } .-1 } */
  16       /* { dg-warning "UNKNOWN" "status quo" { target *-*-* } .-2 } */
  17       /* TODO(xfail^^^): ideally we ought to figure out i > 0 after 1st iteration.  */
  18
  19       __analyzer_eval (i <= start); /* { dg-warning "TRUE" "true" } */
  20       /* { dg-bogus "UNKNOWN" "unknown" { xfail *-*-* } .-1 } */
  21       /* TODO(xfail^^^): should report TRUE twice. */
  22
  23       __analyzer_dump_exploded_nodes (0); /* { dg-warning "2 processed enodes" } */
  24   }
  25
  26   __analyzer_eval (i >= end); /* { dg-warning "TRUE" "true" { xfail *-*-* } } */
  27   /* { dg-bogus "UNKNOWN" "unknown" { xfail *-*-* } .-1 } */
  28
  29   // FIXME: do we know this?  What if we overshoot?
  30   __analyzer_eval (i == end); /* { dg-warning "TRUE" "desired" { xfail *-*-* } } */
  31   /* { dg-warning "UNKNOWN" "status quo" { target *-*-* } .-1 } */
  32   /* TODO(xfail^^^): it only figures out i >= 256, rather than i == 256.  */
  33
  34   __analyzer_dump_exploded_nodes (0); /* { dg-warning "1 processed enode" } */
  35 }