| 1 | /* |
| 2 | * Simple test of using an alternate buffer for the code. |
| 3 | */ |
| 4 | |
| 5 | #include <lightning.h> |
| 6 | #include <stdio.h> |
| 7 | #include <assert.h> |
| 8 | #include <sys/mman.h> |
| 9 | #if defined(__sgi) |
| 10 | # include <fcntl.h> |
| 11 | #endif |
| 12 | |
| 13 | #ifndef MAP_ANON |
| 14 | # define MAP_ANON MAP_ANONYMOUS |
| 15 | # ifndef MAP_ANONYMOUS |
| 16 | # define MAP_ANONYMOUS 0 |
| 17 | # endif |
| 18 | #endif |
| 19 | |
| 20 | #if !defined(__sgi) |
| 21 | #define mmap_fd -1 |
| 22 | #endif |
| 23 | |
| 24 | int |
| 25 | main(int argc, char *argv[]) |
| 26 | { |
| 27 | jit_uint8_t *ptr; |
| 28 | jit_state_t *_jit; |
| 29 | jit_word_t length; |
| 30 | #if defined(__sgi) |
| 31 | int mmap_fd; |
| 32 | #endif |
| 33 | void (*function)(void); |
| 34 | int mmap_prot, mmap_flags, result; |
| 35 | |
| 36 | #if defined(__sgi) |
| 37 | mmap_fd = open("/dev/zero", O_RDWR); |
| 38 | #endif |
| 39 | |
| 40 | mmap_prot = PROT_READ | PROT_WRITE; |
| 41 | #if !(__OpenBSD__ || __APPLE__) |
| 42 | mmap_prot |= PROT_EXEC; |
| 43 | #endif |
| 44 | #if __NetBSD__ |
| 45 | mmap_prot = PROT_MPROTECT(mmap_prot); |
| 46 | mmap_flags = 0; |
| 47 | #else |
| 48 | mmap_flags = MAP_PRIVATE; |
| 49 | #endif |
| 50 | mmap_flags |= MAP_ANON; |
| 51 | ptr = mmap(NULL, 1024 * 1024, mmap_prot, mmap_flags, mmap_fd, 0); |
| 52 | assert(ptr != MAP_FAILED); |
| 53 | #if defined(__sgi) |
| 54 | close(mmap_fd); |
| 55 | #endif |
| 56 | |
| 57 | init_jit(argv[0]); |
| 58 | _jit = jit_new_state(); |
| 59 | |
| 60 | jit_prolog(); |
| 61 | jit_prepare(); |
| 62 | jit_pushargi((jit_word_t)"%s\n"); |
| 63 | jit_ellipsis(); |
| 64 | jit_pushargi((jit_word_t)"ok"); |
| 65 | jit_finishi(printf); |
| 66 | |
| 67 | /* call to jit_realize() is only required when using an alternate |
| 68 | * code buffer. Note that not using mmap'ed memory may not work |
| 69 | * on several ports and/or operating system versions */ |
| 70 | jit_realize(); |
| 71 | |
| 72 | length = 0; |
| 73 | if (jit_get_code(&length) != NULL) |
| 74 | abort(); |
| 75 | |
| 76 | if (length <= 4) |
| 77 | abort(); |
| 78 | |
| 79 | /* check that a too small buffer fails */ |
| 80 | jit_set_code(ptr, 4); |
| 81 | function = jit_emit(); |
| 82 | if (function != NULL) |
| 83 | abort(); |
| 84 | |
| 85 | #if __NetBSD__ |
| 86 | result = mprotect(ptr, 1024 * 1024, PROT_READ | PROT_WRITE); |
| 87 | assert(result == 0); |
| 88 | #endif |
| 89 | /* and calling again with enough space works */ |
| 90 | jit_set_code(ptr, 1024 * 1024); |
| 91 | function = jit_emit(); |
| 92 | if (function == NULL) |
| 93 | abort(); |
| 94 | |
| 95 | jit_clear_state(); |
| 96 | #if __NetBSD__ || __OpenBSD__ || __APPLE__ |
| 97 | result = mprotect(ptr, 1024 * 1024, PROT_READ | PROT_EXEC); |
| 98 | assert(result == 0); |
| 99 | #endif |
| 100 | (*function)(); |
| 101 | jit_destroy_state(); |
| 102 | finish_jit(); |
| 103 | |
| 104 | munmap(ptr, 1024 * 1024); |
| 105 | |
| 106 | return (0); |
| 107 | } |