6 files changed, 25 insertions, 23 deletions
diff --git a/server/src/vm/function.lua b/server/src/vm/function.lua
index 8625853f..973f984e 100644
--- a/server/src/vm/function.lua
+++ b/server/src/vm/function.lua
@@ -98,20 +98,18 @@ function mt:setReturn(index, value)
     end
     if value then
         self.returns[index] = value
-    else
-        self.returns[index] = createValue('any', self:getSource() or sourceMgr.dummy())
     end
 end
 
 function mt:getReturn(index)
     if self.maxReturns and index and self.maxReturns < index then
-        return createValue('nil', sourceMgr.dummy())
+        return nil
     end
     if not self.returns then
         self.returns = createMulti()
     end
     if index then
-        return self.returns:get(index) or createValue('nil', sourceMgr.dummy())
+        return self.returns:get(index)
     else
         return self.returns
     end
@@ -174,7 +172,7 @@ function mt:run(vm)
 
     -- 向局部变量中填充参数
     for i, loc in ipairs(self.args) do
-        loc:setValue(self.argValues[i] or createValue('nil', sourceMgr.dummy()))
+        loc:setValue(self.argValues[i])
     end
     if self._dots then
         self._dots = createMulti()
@@ -205,12 +203,12 @@ function mt:createArg(vm, arg)
     end
 end
 
-function mt:createLibArg(arg)
+function mt:createLibArg(arg, source)
     if arg.type == '...' then
         self._dots = createMulti()
     else
         local name = arg.name or '_'
-        local loc = createLocal(name, sourceMgr.dummy(), createValue('any', sourceMgr.dummy()))
+        local loc = createLocal(name, source, createValue('any', source))
         self:saveLocal(name, loc)
         self.args[#self.args+1] = loc
     end
diff --git a/server/src/vm/library.lua b/server/src/vm/library.lua
index 24a17389..67d2d263 100644
--- a/server/src/vm/library.lua
+++ b/server/src/vm/library.lua
@@ -23,7 +23,7 @@ function buildLibValue(lib)
         value:setFunction(func)
         if lib.args then
             for _, arg in ipairs(lib.args) do
-                func:createLibArg(arg)
+                func:createLibArg(arg, sourceMgr.dummy())
             end
         end
         if lib.returns then
diff --git a/server/src/vm/multi.lua b/server/src/vm/multi.lua
index aaff97ec..9208656b 100644
--- a/server/src/vm/multi.lua
+++ b/server/src/vm/multi.lua
@@ -4,39 +4,40 @@ local sourceMgr = require 'vm.source'
 local mt = {}
 mt.__index = mt
 mt.type = 'multi'
+mt.len = 0
 
 function mt:push(value, isLast)
     if value.type == 'list' then
         if isLast then
             for _, v in ipairs(value) do
-                self[#self+1] = v
+                self.len = self.len + 1
+                self[self.len] = v
             end
         else
-            self[#self+1] = value[1]
+            self.len = self.len + 1
+            self[self.len] = value[1]
         end
     else
-        self[#self+1] = value
+        self.len = self.len + 1
+        self[self.len] = value
     end
 end
 
 function mt:get(index)
-    for n = #self+1, index do
-        self[n] = createValue('any', sourceMgr.dummy())
+    if index > self.len then
+        self.len = index
     end
     return self[index]
 end
 
 function mt:set(index, value)
-    for n = #self+1, index-1 do
-        self[n] = createValue('any', sourceMgr.dummy())
-    end
     self[index] = value
 end
 
 function mt:first()
     local value = self[1]
     if not value then
-        return createValue('nil', sourceMgr.dummy())
+        return nil
     end
     if value.type == 'multi' then
         return value:first()
@@ -49,7 +50,7 @@ function mt:eachValue(callback)
     local i = 0
     for n, value in ipairs(self) do
         if value.type == 'multi' then
-            if n == #self then
+            if n == self.len then
                 value:eachValue(function (_, nvalue)
                     i = i + 1
                     callback(i, nvalue)
diff --git a/server/src/vm/source.lua b/server/src/vm/source.lua
index 365c2757..af8b9ab3 100644
--- a/server/src/vm/source.lua
+++ b/server/src/vm/source.lua
@@ -109,10 +109,7 @@ local function instant(source)
 end
 
 local function dummy()
-    local src = {
-        start = 0,
-        finish = 0,
-    }
+    local src = {}
     instant(src)
     return src
 end
diff --git a/server/src/vm/value.lua b/server/src/vm/value.lua
index c4336ad4..9fd1fdf1 100644
--- a/server/src/vm/value.lua
+++ b/server/src/vm/value.lua
@@ -250,6 +250,9 @@ function mt:mergeValue(value)
     if self == value then
         return
     end
+    if not value then
+        return
+    end
     if value._type then
         for tp, rate in pairs(value._type) do
             self:setType(tp, rate)
diff --git a/server/src/vm/vm.lua b/server/src/vm/vm.lua
index 4aa3fd3c..df2cd234 100644
--- a/server/src/vm/vm.lua
+++ b/server/src/vm/vm.lua
@@ -291,7 +291,10 @@ function mt:callLibrary(func, values, source, lib)
                 if rtn.type == 'boolean' or rtn.type == 'number' or rtn.type == 'integer' or rtn.type == 'string' then
                     func:setReturn(i, self:createValue(rtn.type, self:getDefaultSource()))
                 end
-                func:getReturn(i):setType(rtn.type or 'any', 1.0)
+                local value = func:getReturn(i)
+                if value then
+                    value:setType(rtn.type or 'any', 1.0)
+                end
             end
         end
     end