1 files changed, 106 insertions, 0 deletions
diff --git a/deps/lightning/check/nodata.c b/deps/lightning/check/nodata.c
new file mode 100644
index 0000000..0e594c3
--- /dev/null
+++ b/deps/lightning/check/nodata.c
@@ -0,0 +1,106 @@
+/*
+ * Simple test of using an alternate buffer for the code.
+ */
+
+#include <lightning.h>
+#include <stdio.h>
+#include <assert.h>
+#include <sys/mman.h>
+#if defined(__sgi)
+#  include <fcntl.h>
+#endif
+
+#ifndef MAP_ANON
+#  define MAP_ANON			MAP_ANONYMOUS
+#  ifndef MAP_ANONYMOUS
+#    define MAP_ANONYMOUS		0
+#  endif
+#endif
+
+#if !defined(__sgi)
+#define  mmap_fd			-1
+#endif
+
+jit_uint8_t		 *data;
+jit_state_t		 *_jit;
+jit_word_t		  data_length;
+jit_word_t		  note_length;
+#if defined(__sgi)
+int			  mmap_fd;
+#endif
+void			(*function)(void);
+
+void
+gencode(jit_word_t flags)
+{
+    jit_word_t		offset;
+    jit_word_t		length;
+
+    _jit = jit_new_state();
+
+    jit_name("main");
+    jit_prolog();
+    jit_prepare();
+    jit_pushargi((jit_word_t)"%f\n");
+    jit_ellipsis();
+    jit_pushargi_d(1.5);
+    jit_finishi(printf);
+    jit_note("nodata.c", __LINE__);
+
+    /* call to jit_realize() is only required when using an alternate
+     * code buffer. Note that not using mmap'ed memory may not work
+     * on several ports and/or operating system versions */
+    jit_realize();
+
+    if (jit_get_data(&data_length, &note_length) != NULL)
+	abort();
+
+    length = 0;
+    if (!(flags & JIT_DISABLE_DATA))
+	length += data_length;
+    if (!(flags & JIT_DISABLE_NOTE))
+	length += note_length;
+
+    /* check that a too small buffer fails */
+    if (flags)
+	jit_set_data(length ? data : NULL, length, flags);
+
+    /* and calling again with enough space works */
+    offset = (length + 7) & -8;
+    function = jit_emit();
+    if (function == NULL)
+	abort();
+
+    jit_clear_state();
+    (*function)();
+    jit_destroy_state();
+}
+
+int
+main(int argc, char *argv[])
+{
+#if defined(__sgi)
+    mmap_fd = open("/dev/zero", O_RDWR);
+#endif
+
+    data = mmap(NULL, 4096,
+		PROT_READ | PROT_WRITE,
+		MAP_PRIVATE | MAP_ANON, mmap_fd, 0);
+    assert(data != MAP_FAILED);
+#if defined(__sgi)
+    close(mmap_fd);
+#endif
+
+    init_jit(argv[0]);
+
+    gencode(0);
+    gencode(JIT_DISABLE_DATA);
+    gencode(JIT_DISABLE_NOTE);
+    gencode(JIT_DISABLE_DATA | JIT_DISABLE_NOTE);
+
+    finish_jit();
+
+    munmap(data, 4096);
+
+    return (0);
+}