clang/test/Analysis/symbolcast-floatingpoint.cpp

   1 // RUN: %clang_analyze_cc1 -x c++ -analyzer-checker=debug.ExprInspection \
   2 // RUN:    -analyzer-config support-symbolic-integer-casts=false \
   3 // RUN:    -verify %s
   4
   5 // RUN: %clang_analyze_cc1 -x c++ -analyzer-checker=debug.ExprInspection \
   6 // RUN:    -analyzer-config support-symbolic-integer-casts=true \
   7 // RUN:    -verify %s
   8
   9 template <typename T>
  10 void clang_analyzer_dump(T);
  11
  12 void test_no_redundant_floating_point_cast(int n) {
  13
  14   double D = n / 30;
  15   clang_analyzer_dump(D); // expected-warning{{(double) ((reg_$0<int n>) / 30)}}
  16
  17   // There are two cast operations evaluated above:
  18   // 1. (n / 30) is cast to a double during the store of `D`.
  19   // 2. Then in the next line, in RegionStore::getBinding during the load of `D`.
  20   //
  21   // We should not see in the dump of the SVal any redundant casts like
  22   // (double) ((double) $n / 30)
  23
  24 }