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-rw-r--r--graphics/asymptote/gc/tests/smash_test.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/graphics/asymptote/gc/tests/smash_test.c b/graphics/asymptote/gc/tests/smash_test.c
new file mode 100644
index 0000000000..ed484265c2
--- /dev/null
+++ b/graphics/asymptote/gc/tests/smash_test.c
@@ -0,0 +1,49 @@
+/* Test that overwrite error detection works reasonably. */
+
+#ifndef GC_DEBUG
+# define GC_DEBUG
+#endif
+
+#include "gc.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#define COUNT 7000
+#define SIZE 40
+
+#define CHECK_OUT_OF_MEMORY(p) \
+ do { \
+ if (NULL == (p)) { \
+ fprintf(stderr, "Out of memory\n"); \
+ exit(69); \
+ } \
+ } while (0)
+
+char * A[COUNT];
+
+char * volatile q;
+
+int main(void)
+{
+ int i;
+ char *p;
+
+ GC_INIT();
+ for (i = 0; i < COUNT; ++i) {
+ A[i] = p = (char *)GC_MALLOC(SIZE);
+ CHECK_OUT_OF_MEMORY(p);
+ if (i % 3000 == 0) {
+ q = NULL;
+ GC_gcollect();
+ } else if (i % 5678 == 0) {
+ /* Write a byte past the end of the allocated object */
+ /* but not beyond the last word of the object's memory. */
+ /* A volatile intermediate pointer variable is used to */
+ /* avoid a compiler complain of out-of-bounds access. */
+ q = &p[(SIZE + i / 2000) /* 42 */];
+ *q = 42;
+ }
+ }
+ return 0;
+}