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3 files changed, 46 insertions, 9 deletions

diff --git a/server/src/vm/label.lua b/server/src/vm/label.lua
index f8f8eb81..b82e98e8 100644
--- a/server/src/vm/label.lua
+++ b/server/src/vm/label.lua
@@ -1,3 +1,11 @@
+local function getDefaultSource()
+    return {
+        start = 0,
+        finish = 0,
+        uri = '',
+    }
+end
+
 local mt = {}
 mt.__index = mt
 mt.type = 'label'
@@ -6,6 +14,26 @@ function mt:getName()
     return self.name
 end
 
+function mt:addInfo(tp, source)
+    if source and not source.start then
+        error('Miss start: ' .. table.dump(source))
+    end
+    self[#self+1] = {
+        type = tp,
+        source = source or getDefaultSource(),
+    }
+end
+
+function mt:eachInfo(callback)
+    for _, info in ipairs(self) do
+        local res = callback(info)
+        if res ~= nil then
+            return res
+        end
+    end
+    return nil
+end
+
 return function (name, source)
     local self = setmetatable({
         name = name,
diff --git a/server/src/vm/source.lua b/server/src/vm/source.lua
index a4839c69..5406298b 100644
--- a/server/src/vm/source.lua
+++ b/server/src/vm/source.lua
@@ -10,9 +10,11 @@ function mt:bindLocal(loc)
     end
 end
 
-function mt:bindLabel(label)
+function mt:bindLabel(label, action)
     if label then
         self._bindLabel = label
+        self._action = action
+        label:addInfo(action, self)
     else
         return self._bindLabel
     end
diff --git a/server/src/vm/vm.lua b/server/src/vm/vm.lua
index 3db7900f..eeb08b76 100644
--- a/server/src/vm/vm.lua
+++ b/server/src/vm/vm.lua
@@ -688,10 +688,15 @@ end
 
 function mt:doLabel(source)
     local name = source[1]
-    self:createLabel(name, source)
+    local label = self:loadLabel(name)
+    if label then
+        self:bindLabel(source, label, 'set')
+    else
+        label = self:createLabel(name, source, 'set')
+    end
 end
 
-function mt:createLabel(name, source)
+function mt:createLabel(name, source, action)
     local label = self:bindLabel(source)
     if label then
         self:saveLabel(label)
@@ -700,15 +705,17 @@ function mt:createLabel(name, source)
 
     label = createLabel(name, source)
     self:saveLabel(label)
-    self:bindLabel(source, label)
+    self:bindLabel(source, label, action)
     return label
 end
 
 function mt:doGoTo(source)
     local name = source[1]
     local label = self:loadLabel(name)
-    if not label then
-        label = self:createLabel(name, source)
+    if label then
+        self:bindLabel(source, label, 'get')
+    else
+        label = self:createLabel(name, source, 'get')
     end
 end
 
@@ -1008,7 +1015,7 @@ function mt:saveLabel(label)
 end
 
 function mt:loadLabel(name)
-    return self.currentFunction:loadLocal(name)
+    return self.currentFunction:loadLabel(name)
 end
 
 function mt:loadDots(expect)
@@ -1038,10 +1045,10 @@ function mt:bindLocal(source, loc)
     end
 end
 
-function mt:bindLabel(source, label)
+function mt:bindLabel(source, label, action)
     self:instantSource(source)
     if label then
-        source:bindLabel(label)
+        source:bindLabel(label, action)
     else
         return source:bindLabel()
     end