一、声明的语义分析； 二、执行体的语义分析： 三、表达式的语义分析； 四、语句的语义分析；

输入输出语句： S →Write(E) E.tuple (WRITE, E.Arg); S → Read(V) V.tuple （READ, V.Arg） 语法制导： S → Read(V) #READ S → Write(E) #WRITE

一、 自底向上分析的思想和主要问题 二、几种LR分析方法：

输入输出语句： S →Write(E) E.tuple (WRITE, E.Arg); S → Read(V) V.tuple （READ, V.Arg） 语法制导： S → Read(V) #READ S → Write(E) #WRITE

8.1.1 Three-Address Code 8.1.2 Data Structures for theImplementation of Three-Address Code

Assuming two bytes for integers, four bytes for addresses, one byte for character and eight bytes for double-precision floating point, we would have the following offset values:

一、中间语言 二、简单表达式的中间代码生成 三、原子语句的中间代码生成 四、结构语句的中间代码生成 五、声明的中间代码

Why Compiler Writing machine language-numeric codes is time consuming and tedious

A stack-based environment will result in a dangling reference when the procedure is exited if a local variable in a procedure can be returned to the caller The simplest example:

Attributes – Any property of a programming language construct such as The data type of a variable The value of an expression The location of a variable in memory