improve performance for large alias struct

fix #1811

Author: sumneko

changelog.md

@@ -14,13 +14,15 @@
 * `FIX` [#1751]
 * `FIX` [#1767]
 * `FIX` [#1808]
+* `FIX` [#1811]
 
 [#831]:  https://github.com/sumneko/lua-language-server/issues/831
 [#1729]: https://github.com/sumneko/lua-language-server/issues/1729
 [#1737]: https://github.com/sumneko/lua-language-server/issues/1737
 [#1751]: https://github.com/sumneko/lua-language-server/issues/1751
 [#1767]: https://github.com/sumneko/lua-language-server/issues/1767
 [#1808]: https://github.com/sumneko/lua-language-server/issues/1808
+[#1811]: https://github.com/sumneko/lua-language-server/issues/1811
 
 `2022-11-29`
 ## 3.6.4

script/vm/infer.lua

@@ -8,6 +8,9 @@ local vm       = require 'vm.vm'
 ---@field node vm.node
 ---@field views table<string, boolean>
 ---@field _drop table
+---@field _lastView? string
+---@field _lastViewUri? uri
+---@field _lastViewDefault? any
 local mt = {}
 mt.__index = mt
 mt._hasTable       = false
@@ -390,9 +393,18 @@ end
 ---@param default? string
 ---@return string
 function mt:view(uri, default)
+    if  self._lastView
+    and self._lastViewUri == uri
+    and self._lastViewDefault == default then
+        return self._lastView
+    end
+    self._lastViewUri = uri
+    self._lastViewDefault = default
+
     self:_computeViews(uri)
 
     if self.views['any'] then
+        self._lastView = 'any'
         return 'any'
     end
 
@@ -445,6 +457,11 @@ function mt:view(uri, default)
         end
     end
 
+    if #view > 200 then
+        view = view:sub(1, 180) .. '...(too long)...' .. view:sub(-10)
+    end
+
+    self._lastView = view
     return view
 end
 

script/vm/type.lua

@@ -221,6 +221,9 @@ local function checkValue(parent, child, mark, errs)
 
     if parent.type == 'doc.type.table' then
         if child.type == 'doc.type.table' then
+            if child == parent then
+                return true
+            end
             ---@cast parent parser.object
             ---@cast child parser.object
             local uri = guide.getUri(parent)