编译原理教学课件:Chapter 6 - Semantic Analysis.pptVIP

编译原理教学课件:Chapter 6 - Semantic Analysis.ppt

  1. 1、有哪些信誉好的足球投注网站(book118)网站文档一经付费(服务费),不意味着购买了该文档的版权,仅供个人/单位学习、研究之用,不得用于商业用途,未经授权,严禁复制、发行、汇编、翻译或者网络传播等,侵权必究。。
  2. 2、本站所有内容均由合作方或网友上传,本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺!文档内容仅供研究参考,付费前请自行鉴别。如您付费,意味着您自己接受本站规则且自行承担风险,本站不退款、不进行额外附加服务;查看《如何避免下载的几个坑》。如果您已付费下载过本站文档,您可以点击 这里二次下载
  3. 3、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等,请点击“版权申诉”(推荐),也可以打举报电话:400-050-0827(电话支持时间:9:00-18:30)。
  4. 4、该文档为VIP文档,如果想要下载,成为VIP会员后,下载免费。
  5. 5、成为VIP后,下载本文档将扣除1次下载权益。下载后,不支持退款、换文档。如有疑问请联系我们
  6. 6、成为VIP后,您将拥有八大权益,权益包括:VIP文档下载权益、阅读免打扰、文档格式转换、高级专利检索、专属身份标志、高级客服、多端互通、版权登记。
  7. 7、VIP文档为合作方或网友上传,每下载1次, 网站将根据用户上传文档的质量评分、类型等,对文档贡献者给予高额补贴、流量扶持。如果你也想贡献VIP文档。上传文档
查看更多
* * * * * * * * * * * * * * * * Type checker is based on a representation of types and a typeEqual operations. Consider a simple grammar as follows: program? var-decls; stmts var-decls ? var-decls; var-decl | var-decl var-decl ? id: type-exp type-exp ? int |bool|array [num] of type-exp stmts ? stmts; stmt|stmt stmt ? if exp then stmt | id :=exp Declarations: cause the type of an identifier to be entered into the symbol table Statements: substructures will need to be checked for type correctness Expression: variable name have their types determined by a lookup in the symbol table, the other expression are formed by operators. * * * * * * Assignment 6.4 6.7 6.11 6.13 * * * * ? Are any names declared but not used? ? Is an expression type-consistent? Is x defined before it is used? Where can x be stored? (heap, stack, …) Does function foo produce a constant value? * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * int i,j; int f(int size) { char i, temp; ... { double j; ... } ... { char *j; ... } } 0 1 4 3 2 next size i (char) temp head 0 1 4 3 2 next j i f Example int i,j; int f(int size) { char i, temp; ... { double j; ... } ... { char *j; ... } } 0 1 4 3 2 next size i (char) temp head 0 1 4 3 2 next j i f 0 1 4 3 2 next j (double) Example int i,j; int f(int size) { char i, temp; ... { double j; ... } ... { char *j; ... } } 0 1 4 3 2 next size i (char) temp head 0 1 4 3 2 next j i f 0 1 4 3 2 next j (double) As we leave this scope Example int i,j; int f(int size) { char i, temp; ... { double j; ... } ... { char *j; ... } } 0 1 4 3 2 next size i (char) temp head 0 1 4 3 2 next j i f As we leave this scope Example Example int i,j; int f(int siz

文档评论(0)

学习让人进步 + 关注
实名认证
文档贡献者

活到老,学到老!知识无价!

1亿VIP精品文档

相关文档