编译原理语义分析实验报告——免费!

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1、语义分析实验报告一、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。二、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。三、算法思想：1、设置语义过程。（1）emit(char*result,char*ag1,char*op,char*ag2)该函数的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{charresult[8];charag1[8];charop[8];charag2[8];}quad[20];

2、(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;charm[8];p=(char*)malloc(8);k++;itoa(k,m,10);strcpy(p+1,m);p[0]=’t’;return(p);}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。otherstaffoftheCentre.Duringthewar,Zhuwastransferre

3、dbacktoJiangxi,andDirectorofthenewOfficeinJingdezhen,JiangxiCommitteeSecretary.Startingin1939servedasrecorderoftheWestNorthOrganization,SecretaryoftheSpecialCommitteeAfterthevictoryofthelongMarch,hehasbeentheNorthwestOfficeoftheFederationofStateenterprisesMinister,Shenmufu

4、guSARmissions,DirectorofNingxiaCountypartyCommitteeSecretaryandrecorderoftheCountypartyCommitteeSecretary,Ministersand一、源程序代码：#include#include#include#includestruct{charresult[12];charag1[12];charop[12];charag2[12];}quad;charprog[80

5、],token[12];charch;intsyn,p,m=0,n,sum=0,kk;//p是缓冲区prog的指针，m是token的指针char*rwtab[6]={"begin","if","then","while","do","end"};voidscaner();char*factor(void);char*term(void);char*expression(void);intyucu();voidemit(char*result,char*ag1,char*op,char*ag2);char*newtemp();intstate

6、ment();intk=0;voidemit(char*result,char*ag1,char*op,char*ag2){strcpy(quad.result,result);strcpy(quad.ag1,ag1);strcpy(quad.op,op);strcpy(quad.ag2,ag2);otherstaffoftheCentre.Duringthewar,ZhuwastransferredbacktoJiangxi,andDirectorofthenewOfficeinJingdezhen,JiangxiCommitteeSec

7、retary.Startingin1939servedasrecorderoftheWestNorthOrganization,SecretaryoftheSpecialCommitteeAfterthevictoryofthelongMarch,hehasbeentheNorthwestOfficeoftheFederationofStateenterprisesMinister,ShenmufuguSARmissions,DirectorofNingxiaCountypartyCommitteeSecretaryandrecordero

8、ftheCountypartyCommitteeSecretary,Ministersandcout<