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-rw-r--r--src/lapi.js15
1 files changed, 14 insertions, 1 deletions
diff --git a/src/lapi.js b/src/lapi.js
index cea0568..ca5a8a0 100644
--- a/src/lapi.js
+++ b/src/lapi.js
@@ -91,8 +91,20 @@ const index2addr_ = function(L, idx) {
};
const lua_checkstack = function(L, n) {
+ let res;
let ci = L.ci;
- let res = L.stack.length < luaconf.LUAI_MAXSTACK;
+ assert(n >= 0, "negative 'n'");
+ if (L.stack_last - L.top > n) /* stack large enough? */
+ res = true;
+ else { /* no; need to grow stack */
+ let inuse = L.top + lstate.EXTRA_STACK;
+ if (inuse > luaconf.LUAI_MAXSTACK - n) /* can grow without overflow? */
+ res = false; /* no */
+ else { /* try to grow stack */
+ ldo.luaD_growstack(L, n);
+ res = true;
+ }
+ }
if (res && ci.top < L.top + n)
ci.top = L.top + n; /* adjust frame top */
@@ -140,6 +152,7 @@ const lua_pushvalue = function(L, idx) {
const lua_settop = function(L, idx) {
let func = L.ci.funcOff;
if (idx >= 0) {
+ assert(idx <= L.stack_last - (func + 1), "new top too large");
while (L.top < func + 1 + idx)
L.stack[L.top++] = new TValue(CT.LUA_TNIL, null);
L.top = func + 1 + idx;