Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/bdwgc/tests/trace_test.c

@@ -0,0 +1,43 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifndef GC_DEBUG
+# define GC_DEBUG
+#endif
+
+#include "gc.h"
+#include "gc_backptr.h"
+
+struct treenode {
+    struct treenode *x;
+    struct treenode *y;
+} * root[10];
+
+struct treenode * mktree(int i) {
+  struct treenode * r = GC_NEW(struct treenode);
+  if (0 == i)
+    return 0;
+  if (1 == i)
+    r = (struct treenode *)GC_MALLOC_ATOMIC(sizeof(struct treenode));
+  if (r == NULL) {
+    fprintf(stderr, "Out of memory\n");
+    exit(1);
+  }
+  r -> x = mktree(i-1);
+  r -> y = mktree(i-1);
+  return r;
+}
+
+int main(void)
+{
+  int i;
+  GC_INIT();
+  for (i = 0; i < 10; ++i) {
+    root[i] = mktree(12);
+  }
+  GC_generate_random_backtrace();
+  GC_generate_random_backtrace();
+  GC_generate_random_backtrace();
+  GC_generate_random_backtrace();
+  return 0;
+}