clang/test/Sema/bpf-attr-preserve-access-index.c

   1 // RUN: %clang_cc1 -x c -triple bpf-pc-linux-gnu -dwarf-version=4 -fsyntax-only -verify %s
   2
   3 #define __reloc__ __attribute__((preserve_access_index))
   4 #define __err_reloc__ __attribute__((preserve_access_index(0)))
   5
   6 struct t1 {
   7   int a;
   8   int b[4];
   9   int c:1;
  10 } __reloc__;
  11
  12 union t2 {
  13   int a;
  14   int b[4];
  15   int c:1;
  16 } __reloc__;
  17
  18 struct t3 {
  19   int a;
  20 } __err_reloc__; // expected-error {{'preserve_access_index' attribute takes no arguments}}
  21
  22 struct t4 {
  23   union {
  24     int a;
  25     char b[5];
  26   };
  27   struct {
  28     int c:1;
  29   } __reloc__;
  30   int d;
  31 } __reloc__;
  32
  33 struct __reloc__ p;
  34 struct __reloc__ q;
  35 struct p {
  36   int a;
  37 };
  38
  39 int a __reloc__; // expected-error {{'preserve_access_index' attribute only applies to structs, unions, and classes}}
  40 struct s *p __reloc__; // expected-error {{'preserve_access_index' attribute only applies to structs, unions, and classes}}
  41
  42 void invalid1(const int __reloc__ *arg) {} // expected-error {{'preserve_access_index' attribute only applies to structs, unions, and classes}}
  43 void invalid2(void) { const int __reloc__ *arg; } // expected-error {{'preserve_access_index' attribute only applies to structs, unions, and classes}}
  44 int valid3(struct t4 *arg) { return arg->a + arg->b[3] + arg->c + arg->d; }
  45 int valid4(void *arg) {
  46   struct local_t { int a; int b; } __reloc__;
  47   return ((struct local_t *)arg)->b;
  48 }