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      1 /* ===-- trampoline_setup_test.c - Test __trampoline_setup -----------------===
      2  *
      3  *                     The LLVM Compiler Infrastructure
      4  *
      5  * This file is dual licensed under the MIT and the University of Illinois Open
      6  * Source Licenses. See LICENSE.TXT for details.
      7  *
      8  * ===----------------------------------------------------------------------===
      9  */
     10 
     11 
     12 #include <stdio.h>
     13 #include <string.h>
     14 #include <stdint.h>
     15 #include <sys/mman.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
     65