From 6d1484d41f5b5d561d21d6e497bd1ec437973464 Mon Sep 17 00:00:00 2001
From: daurnimator <quae@daurnimator.com>
Date: Mon, 29 May 2017 15:35:46 +1000
Subject: src/lfunc.js: Give UpVals an id field

This way they have an id when printed via %p. e.g.
`debug.upvalueid(function() print() end, 1)`
---
 src/lfunc.js   | 5 +++--
 src/lobject.js | 4 +++-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/src/lfunc.js b/src/lfunc.js
index 97e5f02..b4684e1 100644
--- a/src/lfunc.js
+++ b/src/lfunc.js
@@ -29,7 +29,8 @@ class Proto {
 
 class UpVal {
 
-    constructor() {
+    constructor(L) {
+        this.id = L.l_G.id_counter++;
         this.v = void 0; /* if open: reference to TValue on stack. if closed: TValue */
         this.vOff = void 0; /* if open: index on stack. if closed: undefined */
         this.refcount = 0;
@@ -59,7 +60,7 @@ const luaF_findupval = function(L, level) {
         p = p.open_next;
     }
     /* not found: create a new upvalue */
-    let uv = new UpVal();
+    let uv = new UpVal(L);
     /* link it to list of open upvalues */
     uv.open_next = p;
     if (prevp)
diff --git a/src/lobject.js b/src/lobject.js
index db76cb5..44d8c9b 100644
--- a/src/lobject.js
+++ b/src/lobject.js
@@ -7,6 +7,7 @@ const defs    = require('./defs.js');
 const ljstype = require('./ljstype.js');
 const ldebug  = require('./ldebug.js');
 const ldo     = require('./ldo.js');
+const lfunc   = require('./lfunc.js');
 const lstate  = require('./lstate.js');
 const lstring = require('./lstring.js');
 const ltable  = require('./ltable.js');
@@ -577,7 +578,8 @@ const luaO_pushvfstring = function(L, fmt, argp) {
                     v instanceof ltable.Table ||
                     v instanceof Udata ||
                     v instanceof LClosure ||
-                    v instanceof CClosure) {
+                    v instanceof CClosure ||
+                    v instanceof lfunc.UpVal) {
                     pushstr(L, defs.to_luastring("0x"+v.id.toString(16)));
                 } else {
                     /* user provided object. no id available */
-- 
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