1 files changed, 3 insertions, 1 deletions
diff --git a/src/wasm.h b/src/wasm.h
index 6cbe93e3b..ce6b9d294 100644
--- a/src/wasm.h
+++ b/src/wasm.h
@@ -1074,6 +1074,8 @@ public:
 
 class Memory {
 public:
+  static const size_t kPageSize = 64 * 1024;
+  static const size_t kPageMask = ~(kPageSize - 1);
   struct Segment {
     size_t offset;
     const char* data;
@@ -1082,7 +1084,7 @@ public:
     Segment(size_t offset, const char *data, size_t size) : offset(offset), data(data), size(size) {}
   };
 
-  size_t initial, max;
+  size_t initial, max; // sizes are in pages
   std::vector<Segment> segments;
 
   Memory() : initial(0), max((uint32_t)-1) {}