From 5a0b0ec3aa5be6c541f82f61fe09e98420ca9cd7 Mon Sep 17 00:00:00 2001
From: Yury Delendik <ydelendik@mozilla.com>
Date: Thu, 11 Oct 2018 15:03:26 -0500
Subject: [PATCH] Disable MMAP in the malloc and stub madvise.

---
 src/internal/malloc_impl.h | 6 ++++++
 src/mman/wasm32/madvise.c  | 6 ++++++
 2 files changed, 12 insertions(+)
 create mode 100644 src/mman/wasm32/madvise.c

diff --git a/src/internal/malloc_impl.h b/src/internal/malloc_impl.h
index 5d025b06..8039ee82 100644
--- a/src/internal/malloc_impl.h
+++ b/src/internal/malloc_impl.h
@@ -34,7 +34,13 @@ struct bin {
 
 #define C_INUSE  ((size_t)1)
 
+#ifndef __wasm__
 #define IS_MMAPPED(c) !((c)->csize & (C_INUSE))
+#else
+#undef MMAP_THRESHOLD
+#define MMAP_THRESHOLD ((size_t)-1)
+#define IS_MMAPPED(c) (0)
+#endif
 
 __attribute__((__visibility__("hidden")))
 void __bin_chunk(struct chunk *);
diff --git a/src/mman/wasm32/madvise.c b/src/mman/wasm32/madvise.c
new file mode 100644
index 00000000..8d8869d9
--- /dev/null
+++ b/src/mman/wasm32/madvise.c
@@ -0,0 +1,6 @@
+#include <sys/mman.h>
+#include "libc.h"
+
+int __madvise(void *addr, size_t len, int advice) { return 0; }
+
+weak_alias(__madvise, madvise);