编译原理实验+报告+流程图

上传者: jessie84213 | 上传时间: 2021-06-27 21:41:45 | 文件大小: 671KB | 文件类型: RAR
C.3语义分析 实验目的 通过上机实习,加深对语法制导翻译原理的理解,掌握将语法分析所识别的语法成分变换为中间代码的语义翻译方法. 实验要求 采用递归下降语法制导翻译法,对算术表达式、赋值语句进行语义分析并生成四元式序列。 实验的输入和输出 输入是语法分析提供的正确的单词串,输出为三地址指令形式的四元式序列。 例如:对于语句串 begin a:=2+3*4;x:=(a+b)/c end# 输出的三地址指令如下: (1) t1=3*4 (2) t2=2+t1 (3) a=t2 (4) t3=a+b (5) t4=t3/c (6) x=t4 算法思想 1设置语义过程 (1) emit(char *result,char *arg1,char *op,char *ag2) 该函数功能是生成一个三地址语句送到四元式表中。 四元式表的结构如下: struct {char result[8]; char ag1[8]; char op[8]; char ag2[8]; }quad[20]; (2)char *newtemp() 该函数回送一个新的临时变量名,临时变量名产生的顺序为T1,T2,…. Char *newtemp(void) { char *p; char m[8]; p=(char *)malloc(8); k++; itoa(k,m,10); strcpy(p+1,m); p[0]=’t’; return(p); } (2)主程序示意图如图c.10所示。 (2) 函数lrparser在原来语法分析的基础上插入相应的语义动作:将输入串翻译成四元式序列。在实验中我们只对表达式、赋值语句进行翻译。 语义分析程序的C语言程序框架 int lrparser() { int schain=0; kk=0; if(syn=1) { 读下一个单词符号; schain=yucu; /调用语句串分析函数进行分析/ if(syn=6) { 读下一个单词符号; if(syn=0 && (kk==0)) 输出(“success”); } else { if(kk!=1 ) 输出 ‘缺end’ 错误;kk=1;} else{输出’begin’错误;kk=1;} } return(schain); int yucu() { int schain=0; schain=statement();/调用语句分析函数进行分析/ while(syn=26) {读下一个单词符号; schain=statement(); /调用语句分析函数进行分析/ } return(schain); } int statement() { char tt[8],eplace[8]; int schain=0; {switch(syn) {case 10: strcpy(tt,token); scanner(); if(syn=18) {读下一个单词符号; strcpy(eplace,expression()); emit(tt,eplace,””,””); schain=0; } else {输出’缺少赋值号’的错误;kk=1; } return(schain); break; } } char *expression(void) {char *tp,*ep2,*eplace,*tt; tp=(char *)malloc(12);/分配空间/ ep2=(char *)malloc(12); eplace=(char *)malloc(12); tt =(char )malloc(12); strcpy(eplace,term ());/调用term分析产生表达式计算的第一项eplace/ while(syn=13 or 14) { 操作符 tt= ‘+’或者‘—’; 读下一个单词符号; strcpy(ep2,term());/调用term分析产生表达式计算的第二项ep2/ strcpy(tp,newtemp());/调用newtemp产生临时变量tp存储计算结果/ emit(tp,eplace,tt,ep2);/生成四元式送入四元式表/ strcpy(eplace,tp); } return(eplace); } char *term(void)/仿照函数expression编写/ char *factor(void) {char *f

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评论信息

  • lu2fy :
    这份编译原理的实验报告很不错,图文并茂,赞!
    2014-08-04

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