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106 lines
2 KiB
C
106 lines
2 KiB
C
/*
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* Simple test of using an alternate buffer for the code.
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*/
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#include <lightning.h>
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#include <stdio.h>
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#include <assert.h>
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#include <sys/mman.h>
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#if defined(__sgi)
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# include <fcntl.h>
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#endif
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#ifndef MAP_ANON
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# define MAP_ANON MAP_ANONYMOUS
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# ifndef MAP_ANONYMOUS
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# define MAP_ANONYMOUS 0
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# endif
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#endif
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#if !defined(__sgi)
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#define mmap_fd -1
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#endif
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uint8_t *data;
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jit_state_t *_jit;
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jit_word_t data_length;
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jit_word_t note_length;
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#if defined(__sgi)
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int mmap_fd;
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#endif
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void (*function)(void);
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void
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gencode(jit_word_t flags)
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{
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jit_word_t offset;
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jit_word_t length;
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_jit = jit_new_state();
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jit_name("main");
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jit_prolog();
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jit_prepare();
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jit_pushargi((jit_word_t)"%f\n");
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jit_ellipsis();
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jit_pushargi_d(1.5);
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jit_finishi(printf);
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jit_note("nodata.c", __LINE__);
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/* call to jit_realize() is only required when using an alternate
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* code buffer. Note that not using mmap'ed memory may not work
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* on several ports and/or operating system versions */
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jit_realize();
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if (jit_get_data(&data_length, ¬e_length) != NULL)
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abort();
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length = 0;
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if (!(flags & JIT_DISABLE_DATA))
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length += data_length;
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if (!(flags & JIT_DISABLE_NOTE))
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length += note_length;
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/* check that a too small buffer fails */
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if (flags)
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jit_set_data(length ? data : NULL, length, flags);
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/* and calling again with enough space works */
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offset = (length + 7) & -8;
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function = jit_emit();
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if (function == NULL)
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abort();
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jit_clear_state();
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(*function)();
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jit_destroy_state();
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}
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int
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main(int argc, char *argv[])
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{
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#if defined(__sgi)
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mmap_fd = open("/dev/zero", O_RDWR);
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#endif
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data = mmap(NULL, 4096,
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PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANON, mmap_fd, 0);
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assert(data != MAP_FAILED);
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#if defined(__sgi)
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close(mmap_fd);
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#endif
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init_jit(argv[0]);
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gencode(0);
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gencode(JIT_DISABLE_DATA);
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gencode(JIT_DISABLE_NOTE);
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gencode(JIT_DISABLE_DATA | JIT_DISABLE_NOTE);
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finish_jit();
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munmap(data, 4096);
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return (0);
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}
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