7 files changed, 74 insertions, 45 deletions
diff --git a/server/src/core/global.lua b/server/src/core/global.lua
index 007f0fd9..5e466fc8 100644
--- a/server/src/core/global.lua
+++ b/server/src/core/global.lua
@@ -1,12 +1,6 @@
 local mt = {}
 mt.__index = mt
 
-function mt:compileVM(uri)
-    if not self.set[uri] and not self.get[uri] then
-        return
-    end
-end
-
 function mt:markSet(uri)
     if not uri then
         return
diff --git a/server/src/method/textDocument/documentSymbol.lua b/server/src/method/textDocument/documentSymbol.lua
index f9823385..201137c8 100644
--- a/server/src/method/textDocument/documentSymbol.lua
+++ b/server/src/method/textDocument/documentSymbol.lua
@@ -48,6 +48,7 @@ return function (lsp, params)
             end
 
             t:remove()
+            timerCache[uri] = nil
 
             local symbols = core.documentSymbol(vm)
             if not symbols then
diff --git a/server/src/method/textDocument/references.lua b/server/src/method/textDocument/references.lua
index c5a3ebf3..f21625c8 100644
--- a/server/src/method/textDocument/references.lua
+++ b/server/src/method/textDocument/references.lua
@@ -23,6 +23,7 @@ return function (lsp, params)
                 return
             end
             t:remove()
+            LastTask = nil
             vm, lines = lsp:getVM(uri)
 
             local positions = core.references(vm, position, declarat)
diff --git a/server/src/service.lua b/server/src/service.lua
index abac804c..dcf8b2e2 100644
--- a/server/src/service.lua
+++ b/server/src/service.lua
@@ -11,6 +11,7 @@ local buildVM    = require 'vm'
 local sourceMgr  = require 'vm.source'
 local localMgr   = require 'vm.local'
 local valueMgr   = require 'vm.value'
+local chainMgr   = require 'vm.chain'
 
 local ErrorCodes = {
     -- Defined by JSON RPC
@@ -708,5 +709,6 @@ return function ()
         _version = 0,
     }, mt)
     session.global = core.global(session)
+    session.chain  = chainMgr()
     return session
 end
diff --git a/server/src/vm/chain.lua b/server/src/vm/chain.lua
new file mode 100644
index 00000000..23b38a75
--- /dev/null
+++ b/server/src/vm/chain.lua
@@ -0,0 +1,49 @@
+local valueMgr = require 'vm.value'
+local sourceMgr = require 'vm.source'
+
+local mt = {}
+mt.__index = mt
+mt.type = 'chain'
+
+mt.min = 100
+mt.max = 100
+mt.count = 0
+
+function mt:clearCache()
+    if self.count <= self.max then
+        return
+    end
+    local n = 0
+    for uri, value in pairs(self.cache) do
+        local ok = value:eachInfo(function ()
+            return true
+        end)
+        if ok then
+            n = n + 1
+        else
+            self.cache[uri] = nil
+        end
+    end
+    self.count = n
+    self.max = self.count * 2
+    if self.max < self.min then
+        self.max = self.min
+    end
+end
+
+function mt:get(uri)
+    if not self.cache[uri] then
+        self.count = self.count + 1
+        self:clearCache()
+        self.cache[uri] = valueMgr.create('any', sourceMgr.dummy())
+        self.cache[uri]:markGlobal()
+        self.cache[uri].uri = uri
+    end
+    return self.cache[uri]
+end
+
+return function ()
+    return setmetatable({
+        cache = {},
+    }, mt)
+end
diff --git a/server/src/vm/function.lua b/server/src/vm/function.lua
index 2ca12e2b..5b7d8682 100644
--- a/server/src/vm/function.lua
+++ b/server/src/vm/function.lua
@@ -101,6 +101,20 @@ function mt:setReturn(index, value)
     end
 end
 
+function mt:mergeReturn(index, value)
+    self:set('hasReturn', true)
+    if not self.returns then
+        self.returns = createMulti()
+    end
+    if value then
+        if self.returns[index] then
+            self.returns[index]:mergeValue(value)
+        else
+            self.returns[index] = value
+        end
+    end
+end
+
 function mt:getReturn(index)
     if self.maxReturns and index and self.maxReturns < index then
         return nil
diff --git a/server/src/vm/vm.lua b/server/src/vm/vm.lua
index c519ad72..940e822f 100644
--- a/server/src/vm/vm.lua
+++ b/server/src/vm/vm.lua
@@ -153,31 +153,6 @@ function mt:callSetMetaTable(func, values, source)
     values[1]:setMetaTable(values[2])
 end
 
-function mt:getRequire(strValue, destVM)
-    -- 取出对方的主函数
-    local main = destVM.main
-    -- 获取主函数返回值
-    local mainValue = main:getFunction():getReturn(1)
-    if mainValue then
-        mainValue:markGlobal()
-    else
-        mainValue = self:createValue('any', self:getDefaultSource())
-        mainValue.uri = destVM.uri
-    end
-
-    return mainValue
-end
-
-function mt:getLoadFile(strValue, destVM)
-    -- 取出对方的主函数
-    local main = destVM.main
-    -- loadfile 的返回值就是对方的主函数
-    local mainValue = main
-    mainValue:markGlobal()
-
-    return mainValue
-end
-
 function mt:tryRequireOne(strValue, mode)
     if not self.lsp or not self.lsp.workspace then
         return nil
@@ -203,18 +178,8 @@ function mt:tryRequireOne(strValue, mode)
         end
 
         strSource:set('target uri', uri)
-        -- 如果取不到VM（不编译），则做个标记，之后再取一次
-        local destVM = self.lsp:getVM(uri)
         self.lsp:compileChain(self:getUri(), uri)
-        if destVM then
-            if mode == 'require' then
-                return self:getRequire(strValue, destVM)
-            elseif mode == 'loadfile' then
-                return self:getLoadFile(strValue, destVM)
-            elseif mode == 'dofile' then
-                return self:getRequire(strValue, destVM)
-            end
-        end
+        return self.lsp.chain:get(uri)
     end
     return nil
 end
@@ -236,7 +201,7 @@ function mt:callRequire(func, values)
     else
         local requireValue = self:tryRequireOne(values[1], 'require')
         if not requireValue then
-            requireValue = self:createValue('boolean', self:getDefaultSource())
+            requireValue = self:createValue('any', self:getDefaultSource())
             requireValue:set('cross file', true)
         end
         func:setReturn(1, requireValue)
@@ -330,7 +295,7 @@ function mt:call(value, values, source)
                 self:runFunction(func)
             end
         else
-            func:setReturn(1, self:createValue('any', source))
+            func:mergeReturn(1, self:createValue('any', source))
         end
     end
 
@@ -734,7 +699,7 @@ function mt:doReturn(action)
     local func = self:getCurrentFunction()
     values:eachValue(function (n, value)
         value.uri = self:getUri()
-        func:setReturn(n, value)
+        func:mergeReturn(n, value)
         local source = action[n] or value:getSource()
         if not source or source.start == 0 then
             source = self:getDefaultSource()
@@ -1147,6 +1112,9 @@ function mt:createEnvironment(ast)
     -- 整个文件是一个函数
     self.main = self:createFunction(ast)
     self:setCurrentFunction(self.main:getFunction())
+    if self.lsp then
+        self.main:getFunction():mergeReturn(1, self.lsp.chain:get(self.uri))
+    end
     -- 全局变量`_G`
     local global = buildGlobal(self.lsp)
     -- 隐藏的上值`_ENV`