clang/test/Parser/warn-dangling-else.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -verify -Wdangling-else %s
   2
   3 void f(int a, int b, int c, int d, int e) {
   4
   5   // should warn
   6   { if (a) if (b) d++; else e++; } // expected-warning {{add explicit braces to avoid dangling else}}
   7   { if (a) while (b) if (c) d++; else e++; } // expected-warning {{add explicit braces to avoid dangling else}}
   8   { if (a) switch (b) if (c) d++; else e++; } // expected-warning {{add explicit braces to avoid dangling else}}
   9   { if (a) for (;;) if (c) d++; else e++; } // expected-warning {{add explicit braces to avoid dangling else}}
  10   { if (a) if (b) if (d) d++; else e++; else d--; } // expected-warning {{add explicit braces to avoid dangling else}}
  11
  12   if (a)
  13     if (b) {
  14       d++;
  15     } else e++; // expected-warning {{add explicit braces to avoid dangling else}}
  16
  17   // shouldn't
  18   { if (a) if (b) d++; }
  19   { if (a) if (b) if (c) d++; }
  20   { if (a) if (b) d++; else e++; else d--; }
  21   { if (a) if (b) if (d) d++; else e++; else d--; else e--; }
  22   { if (a) do if (b) d++; else e++; while (c); }
  23
  24   if (a) {
  25     if (b) d++;
  26     else e++;
  27   }
  28
  29   if (a) {
  30     if (b) d++;
  31   } else e++;
  32 }
  33
  34 // Somewhat more elaborate case that shouldn't warn.
  35 class A {
  36  public:
  37   void operator<<(const char* s) {}
  38 };
  39
  40 void HandleDisabledThing() {}
  41 A GetThing() { return A(); }
  42
  43 #define FOO(X) \
  44    switch (0) default: \
  45      if (!(X)) \
  46        HandleDisabledThing(); \
  47      else \
  48        GetThing()
  49
  50 void f(bool cond) {
  51   int x = 0;
  52   if (cond)
  53     FOO(x) << "hello"; // no warning
  54 }
  55