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

   1 // RUN: %clang_builtins %s %librt -fnested-functions -o %t && %run %t
   2 // REQUIRES: librt_has_trampoline_setup
   3 /* ===-- trampoline_setup_test.c - Test __trampoline_setup -----------------===
   4  *
   5  * Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   6  * See https://llvm.org/LICENSE.txt for license information.
   7  * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   8  *
   9  * ===----------------------------------------------------------------------===
  10  */
  11
  12
  13 #include <stdio.h>
  14 #include <string.h>
  15 #include <stdint.h>
  16
  17 /*
  18  * Tests nested functions
  19  * The ppc compiler generates a call to __trampoline_setup
  20  * The i386 and x86_64 compilers generate a call to ___enable_execute_stack
  21  */
  22
  23 /*
  24  * Note that, nested functions are not ISO C and are not supported in Clang.
  25  */
  26
  27 #if !defined(__clang__)
  28
  29 typedef int (*nested_func_t)(int x);
  30
  31 nested_func_t proc;
  32
  33 int main() {
  34     /* Some locals */
  35     int c = 10;
  36     int d = 7;
  37
  38     /* Define a nested function: */
  39     int bar(int x) { return x*5 + c*d; };
  40
  41     /* Assign global to point to nested function
  42      * (really points to trampoline). */
  43     proc = bar;
  44
  45     /* Invoke nested function: */
  46     c = 4;
  47     if ( (*proc)(3) != 43 )
  48         return 1;
  49     d = 5;
  50     if ( (*proc)(4) != 40 )
  51         return 1;
  52
  53     /* Success. */
  54     return 0;
  55 }
  56
  57 #else
  58
  59 int main() {
  60     printf("skipped\n");
  61     return 0;
  62 }
  63
  64 #endif