1 files changed, 41 insertions, 0 deletions
diff --git a/tests/dlmalloc_test.c b/tests/dlmalloc_test.c
new file mode 100644
index 00000000..6fbc45ab
--- /dev/null
+++ b/tests/dlmalloc_test.c
@@ -0,0 +1,41 @@
+// Emscripten tests
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+
+int main(int ac, char **av) {
+  int NUM = ac > 1 ? atoi(av[1]) : 0;
+  int REPS = ac > 2 ? atoi(av[2]) : 0;
+  int c1 = 0, c2 = 0;
+  for (int x = 0; x < REPS; x++) {
+    char* allocations[NUM];
+    for (int i = 0; i < NUM/2; i++) {
+      allocations[i] = (char*)malloc((11*i)%1024 + x);
+      assert(allocations[i]);
+      if (i > 10 && i%4 == 1 && allocations[i-10]) {
+        free(allocations[i-10]);
+        allocations[i-10] = NULL;
+      }
+    }
+    for (int i = NUM/2; i < NUM; i++) {
+      allocations[i] = (char*)malloc(1024*(i+1));
+      assert(allocations[i]);
+      if (i > 10 && i%4 != 1 && allocations[i-10]) {
+        free(allocations[i-10]);
+        allocations[i-10] = NULL;
+      }
+    }
+    char* first = allocations[0];
+    for (int i = 0; i < NUM; i++) {
+      if (allocations[i]) {
+        free(allocations[i]);
+      }
+    }
+    char *last = (char*)malloc(512); // should be identical, as we free'd it all
+    char *newer = (char*)malloc(512); // should be different
+    c1 += first == last;
+    c2 += first == newer;
+  }
+  printf("*%d,%d*\n", c1, c2);
+}