From 4c7732b08043dc63ff195b0bc646cc184cefde41 Mon Sep 17 00:00:00 2001
From: daurnimator <quae@daurnimator.com>
Date: Tue, 16 May 2017 16:32:32 +1000
Subject: src/lfunc.js: Fix luaF_findupval, it needs to insert the upvalue into
 correct place in linked list, not the start

---
 src/lfunc.js | 34 ++++++++++++++++------------------
 1 file changed, 16 insertions(+), 18 deletions(-)

(limited to 'src')

diff --git a/src/lfunc.js b/src/lfunc.js
index 7e324da..663f614 100644
--- a/src/lfunc.js
+++ b/src/lfunc.js
@@ -54,28 +54,26 @@ const luaF_newLclosure = function(L, n) {
 
 
 const luaF_findupval = function(L, level) {
-    let pp = L.openupval;
-    let p = pp;
-    while (pp !== null && pp.v >= level) {
-        p = pp;
+    let prevp;
+    let p = L.openupval;
+    while (p !== null && p.v >= level) {
         assert(p.isopen());
-        if (p.v === level)
-            return p;
-
-        pp = p.open_next;
+        if (p.v === level) /* found a corresponding upvalue? */
+            return p; /* return it */
+        prevp = p;
+        p = p.open_next;
     }
-
+    /* not found: create a new upvalue */
     let uv = new UpVal();
-
-    if (p) {  /* The openupval list is not empty */
-        uv.open_next = p;  /* link it to list of open upvalues */
-    }
-
-    L.openupval = uv;
-
+    /* link it to list of open upvalues */
+    uv.open_next = p;
+    if (prevp)
+        prevp.open_next = uv;
+    else
+        L.openupval = uv;
+    /* current value lives in the stack */
     uv.L = L;
-    uv.v = level;  /* current value lives in the stack */
-
+    uv.v = level;
     return uv;
 };
 
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