From 17e4cff6514c75920462397c227408c21336d1ae Mon Sep 17 00:00:00 2001
From: daurnimator <quae@daurnimator.com>
Date: Wed, 13 Dec 2017 14:56:26 +1100
Subject: src/: Use .subarray instead of .slice (optimisation)

---
 src/lauxlib.js | 2 +-
 src/llex.js    | 4 ++--
 src/lobject.js | 6 +++---
 src/lundump.js | 2 +-
 4 files changed, 7 insertions(+), 7 deletions(-)

(limited to 'src')

diff --git a/src/lauxlib.js b/src/lauxlib.js
index 6acf57f..3b2be6e 100644
--- a/src/lauxlib.js
+++ b/src/lauxlib.js
@@ -62,7 +62,7 @@ const pushglobalfuncname = function(L, ar) {
     if (findfield(L, top + 1, 2)) {
         let name = lua.lua_tostring(L, -1);
         if (name[0] === "_".charCodeAt(0) && name[1] === "G".charCodeAt(0) && name[2] === ".".charCodeAt(0)) {  /* name start with '_G.'? */
-            lua.lua_pushstring(L, name.slice(3));  /* push name without prefix */
+            lua.lua_pushstring(L, name.subarray(3));  /* push name without prefix */
             lua.lua_remove(L, -2);  /* remove original name */
         }
         lua.lua_copy(L, -1, top + 1);  /* move name to proper place */
diff --git a/src/llex.js b/src/llex.js
index 9e4bed4..438f288 100644
--- a/src/llex.js
+++ b/src/llex.js
@@ -328,7 +328,7 @@ const read_long_string = function(ls, seminfo, sep) {
     }
 
     if (seminfo)
-        seminfo.ts = luaX_newstring(ls, ls.buff.buffer.slice(2 + sep, ls.buff.n - (2 + sep)));
+        seminfo.ts = luaX_newstring(ls, ls.buff.buffer.subarray(2 + sep, ls.buff.n - (2 + sep)));
 };
 
 const esccheck = function(ls, c, msg) {
@@ -453,7 +453,7 @@ const read_string = function(ls, del, seminfo) {
     }
     save_and_next(ls);  /* skip delimiter */
 
-    seminfo.ts = luaX_newstring(ls, ls.buff.buffer.slice(1, ls.buff.n-1));
+    seminfo.ts = luaX_newstring(ls, ls.buff.buffer.subarray(1, ls.buff.n-1));
 };
 
 const token_to_index = Object.create(null); /* don't want to return true for e.g. 'hasOwnProperty' */
diff --git a/src/lobject.js b/src/lobject.js
index 18adb27..5ca7cd3 100644
--- a/src/lobject.js
+++ b/src/lobject.js
@@ -531,7 +531,7 @@ const luaO_pushvfstring = function(L, fmt, argp) {
     for (;;) {
         e = fmt.indexOf(char['%'], i);
         if (e == -1) break;
-        pushstr(L, fmt.slice(i, e));
+        pushstr(L, fmt.subarray(i, e));
         switch(fmt[e+1]) {
             case char['s']: {
                 let s = argp[a++];
@@ -540,7 +540,7 @@ const luaO_pushvfstring = function(L, fmt, argp) {
                     /* respect null terminator */
                     let i = s.indexOf(0);
                     if (i !== -1)
-                        s = s.slice(0, i);
+                        s = s.subarray(0, i);
                 }
                 pushstr(L, s);
                 break;
@@ -609,7 +609,7 @@ const luaO_pushvfstring = function(L, fmt, argp) {
         i = e + 2;
     }
     ldo.luaD_checkstack(L, 1);
-    pushstr(L, fmt.slice(i));
+    pushstr(L, fmt.subarray(i));
     if (n > 0) lvm.luaV_concat(L, n+1);
     return L.stack[L.top-1].svalue();
 };
diff --git a/src/lundump.js b/src/lundump.js
index 7461813..e49c376 100644
--- a/src/lundump.js
+++ b/src/lundump.js
@@ -25,7 +25,7 @@ class BytecodeParser {
         assert(defs.is_luastring(name));
 
         if (name[0] == defs.char["@"] || name[0] == defs.char["="])
-            this.name = name.slice(1);
+            this.name = name.subarray(1);
         else if (name[0] == defs.LUA_SIGNATURE.charCodeAt(0))
             this.name = defs.to_luastring("binary string", true);
         else
-- 
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