clang/test/SemaCXX/array-bounds-strict-flex-arrays.cpp

   1 // RUN: %clang_cc1 -verify=relaxed                    -fstrict-flex-arrays=1 %s
   2 // RUN: %clang_cc1 -verify=relaxed,strict             -fstrict-flex-arrays=2 %s
   3 // RUN: %clang_cc1 -verify=relaxed,strict,very-strict -fstrict-flex-arrays=3 %s
   4
   5 // We cannot know for sure the size of a flexible array.
   6 struct t {
   7   int f;
   8   int a[];
   9 };
  10 void test(t *s2) {
  11   s2->a[2] = 0; // no-warning
  12 }
  13
  14 // Under -fstrict-flex-arrays={1,2,3} `a` is not a flexible array
  15 struct t0 {
  16   int f;
  17   int a[10]; // relaxed-note {{array 'a' declared here}}
  18 };
  19 void test0(t0 *s2) {
  20   s2->a[12] = 0; // relaxed-warning {{array index 12 is past the end of the array (that has type 'int[10]')}}
  21 }
  22
  23
  24 // Under -fstrict-flex-arrays=2 `a` is not a flexible array, but it is under -fstrict-flex-arrays=1
  25 struct t1 {
  26   int f;
  27   int a[1]; // strict-note {{array 'a' declared here}}
  28 };
  29 void test1(t1 *s2) {
  30   s2->a[2] = 0; // strict-warning {{array index 2 is past the end of the array (that has type 'int[1]')}}
  31 }
  32
  33 // Under -fstrict-flex-arrays={1,2} `a` is a flexible array, but not under -fstrict-flex-arrays=3.
  34 struct t2 {
  35   int f;
  36   int a[0]; // very-strict-note {{array 'a' declared here}}
  37 };
  38 void test1(t2 *s2) {
  39   s2->a[2] = 0; // very-strict-warning {{array index 2 is past the end of the array (that has type 'int[0]')}}
  40 }