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path: root/src/ldebug.js
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Diffstat (limited to 'src/ldebug.js')
-rw-r--r--src/ldebug.js68
1 files changed, 63 insertions, 5 deletions
diff --git a/src/ldebug.js b/src/ldebug.js
index 3d66d85..5a5fc34 100644
--- a/src/ldebug.js
+++ b/src/ldebug.js
@@ -59,6 +59,63 @@ const upvalname = function(p, uv) {
return s;
};
+const findvararg = function(ci, n, pos) {
+ let nparams = ci.func.p.numparams;
+ if (n >= ci.u.l.base - ci.funcOff - nparams)
+ return null; /* no such vararg */
+ else {
+ return {
+ pos: ci.funcOff + nparams + n,
+ name: lua.to_luastring("(*vararg)") /* generic name for any vararg */
+ };
+ }
+};
+
+const findlocal = function(L, ci, n) {
+ let base, name = null;
+
+ if (ci.callstatus & lstate.CIST_LUA) {
+ if (n < 0) /* access to vararg values? */
+ return findvararg(ci, -n);
+ else {
+ base = ci.u.l.base;
+ name = lfunc.luaF_getlocalname(ci.func.p, n, ci.pcOff);
+ }
+ } else
+ base = ci.funcOff + 1;
+
+ if (name === null) { /* no 'standard' name? */
+ let limit = ci === L.ci ? L.top : ci.next.func;
+ if (limit - base >= n && n > 0) /* is 'n' inside 'ci' stack? */
+ name = lua.to_luastring("(*temporary)"); /* generic name for any valid slot */
+ else
+ return null; /* no name */
+ }
+ return {
+ pos: base + (n - 1),
+ name: name
+ };
+};
+
+const lua_getlocal = function(L, ar, n) {
+ let name;
+ swapextra(L);
+ if (ar === null) { /* information about non-active function? */
+ if (!L.stack[L.top - 1].ttisLclosure()) /* not a Lua function? */
+ name = null;
+ else /* consider live variables at function start (parameters) */
+ name = lfunc.luaF_getlocalname(L.stack[L.top - 1].value.p, n, 0);
+ } else { /* active function; get information through 'ar' */
+ let local = findlocal(L, ar.i_ci, n);
+ name = local.name;
+ let pos = L.stack[local.pos];
+ if (name)
+ L.stack[L.top++] = new TValue(pos.type, pos.value);
+ }
+ swapextra(L);
+ return name;
+};
+
const funcinfo = function(ar, cl) {
if (cl === null || cl.type === CT.LUA_TCCL) {
ar.source = lua.to_luastring("=[JS]");
@@ -503,13 +560,14 @@ const luaG_tointerror = function(L, p1, p2) {
luaG_runerror(L, lua.to_luastring(`number${lobject.jsstring(varinfo(L, p2))} has no integer representation`));
};
-module.exports.lua_getstack = lua_getstack;
-module.exports.lua_getinfo = lua_getinfo;
-module.exports.luaG_errormsg = luaG_errormsg;
module.exports.luaG_addinfo = luaG_addinfo;
-module.exports.luaG_runerror = luaG_runerror;
-module.exports.luaG_typeerror = luaG_typeerror;
module.exports.luaG_concaterror = luaG_concaterror;
+module.exports.luaG_errormsg = luaG_errormsg;
module.exports.luaG_opinterror = luaG_opinterror;
module.exports.luaG_ordererror = luaG_ordererror;
+module.exports.luaG_runerror = luaG_runerror;
module.exports.luaG_tointerror = luaG_tointerror;
+module.exports.luaG_typeerror = luaG_typeerror;
+module.exports.lua_getinfo = lua_getinfo;
+module.exports.lua_getlocal = lua_getlocal;
+module.exports.lua_getstack = lua_getstack;