From 5811c2c7d50c10327565a23e19bf39c105593710 Mon Sep 17 00:00:00 2001
From: Blaine Bublitz <blaine.bublitz@gmail.com>
Date: Fri, 24 Jun 2022 16:32:44 -0700
Subject: [JS API] Avoid trying to read the offset if segment is passive
 (#4750)

This avoids hitting an assertion.
---
 src/js/binaryen.js-post.js | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/js/binaryen.js-post.js b/src/js/binaryen.js-post.js
index b6ea7dee1..f2e5c464e 100644
--- a/src/js/binaryen.js-post.js
+++ b/src/js/binaryen.js-post.js
@@ -2519,8 +2519,13 @@ function wrapModule(module, self = {}) {
     return Module['_BinaryenGetNumMemorySegments'](module);
   };
   self['getMemorySegmentInfoByIndex'] = function(id) {
+    const passive = Boolean(Module['_BinaryenGetMemorySegmentPassive'](module, id));
+    let offset = null;
+    if (!passive) {
+      offset = Module['_BinaryenGetMemorySegmentByteOffset'](module, id);
+    }
     return {
-      'offset': Module['_BinaryenGetMemorySegmentByteOffset'](module, id),
+      'offset': offset,
       'data': (function(){
         const size = Module['_BinaryenGetMemorySegmentByteLength'](module, id);
         const ptr = _malloc(size);
@@ -2530,7 +2535,7 @@ function wrapModule(module, self = {}) {
         _free(ptr);
         return res.buffer;
       })(),
-      'passive': Boolean(Module['_BinaryenGetMemorySegmentPassive'](module, id))
+      'passive': passive
     };
   };
   self['setStart'] = function(start) {
-- 
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