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                            [TOC]

## 基于SDD的翻譯
SSD全程為Syntax Direacted Definition

![](https://img.kancloud.cn/90/e9/90e9d9f344002d856d90f4d0d3dd92c7_400x176.png)

特點:
- 解耦—1套AST多套使用方法
- 規范—(先寫出SDD再寫程序不需要過多思考)—類比語法分析部分的產生式到遞歸的關系

## 語法執導定義
定義抽象語法樹如何被翻譯
組成:
- 文法(如何組織翻譯程序)
    - 屬性(用于存儲結果和中間值)
    - 規則(描述屬性如何被計算)

### 四則運算的語法制導定義(SDD)
![](https://img.kancloud.cn/0f/9b/0f9b1649e4569a027e060865e9db2395_400x140.png)

## 利用翻譯形成代碼
![](https://img.kancloud.cn/d7/9e/d79ebd90970acd7364ed55839a57c297_400x189.png)
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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