compiler-rt/test/builtins/Unit/trampoline_setup_test.c

   1 // RUN: %clang_builtins %s %librt -o %t && %run %t
   2 // REQUIRES: librt_has_trampoline_setup
   3
   4 #include <stdio.h>
   5 #include <string.h>
   6 #include <stdint.h>
   7
   8 /*
   9  * Tests nested functions
  10  * The ppc and aarch64 compilers generates a call to __trampoline_setup
  11  * The i386 and x86_64 compilers generate a call to ___enable_execute_stack
  12  */
  13
  14 /*
  15  * Note that, nested functions are not ISO C and are not supported in Clang.
  16  */
  17
  18 #if !defined(__clang__)
  19
  20 typedef int (*nested_func_t)(int x);
  21
  22 nested_func_t proc;
  23
  24 int main() {
  25     /* Some locals */
  26     int c = 10;
  27     int d = 7;
  28
  29     /* Define a nested function: */
  30     int bar(int x) { return x*5 + c*d; };
  31
  32     /* Assign global to point to nested function
  33      * (really points to trampoline). */
  34     proc = bar;
  35
  36     /* Invoke nested function: */
  37     c = 4;
  38     if ( (*proc)(3) != 43 )
  39         return 1;
  40     d = 5;
  41     if ( (*proc)(4) != 40 )
  42         return 1;
  43
  44     /* Success. */
  45     return 0;
  46 }
  47
  48 #else
  49
  50 int main() {
  51     printf("skipped\n");
  52     return 0;
  53 }
  54
  55 #endif