【PDF】编译原理 斯坦福大学课件 Slides01.pdf

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1、LexicalAnalysisAnnouncements●ProgrammingAssignment1Out●DueMonday,July9at11:59PM.●Fourhandouts(allavailableonline):●DecafSpecification●LexicalAnalysis●Introtoflex●ProgrammingAssignment1WhereWeAreSourceLexicalAnalysisCodeSyntaxAnalysisSemanticAnalysisIRGenerationIROptimizationCodeG

2、enerationOptimizationMachineCodewhile(ip

3、=new0;do[for]=new0;T_Do[T_For]=T_NewT_IntConst0do[for]=new0;do[for]=new0;T_Do[T_For]=T_NewT_IntConst0do[for]=new0;do[for]=new0;ScanningaSourceFilewhile(i1p37<

4、ScanningaSourceFilewhile(i1p37<

5、)t++i;ThepieceoftheoriginalprogramThepieceoftheoriginalprogramfromwhichwemadethetokenisfromwhichwemadethetokeniscalledalexeme.calledalexeme.T_WhileThisiscalledatoken.YoucanThisiscalledatoken.Youcanthinkofitasanenumeratedtypethinkofitasanenumeratedtyperepresentingwhatlogicalent

6、itywerepresentingwhatlogicalentitywereadoutofthesourcecode.readoutofthesourcecode.ScanningaSourceFilewhile(137

7、dalexemeSometimeswewilldiscardalexemeratherthanstoringitforlateruse.T_Whileratherthanstoringitforlateruse.Here,weignorewhitespace,sinceitHere,weignorewhitespace,sinceithasnobearingonthemeaningofhasnobearingonthemeaningoftheprogram.theprogram.ScanningaSourceFilewhile(137

8、;T_WhileScanningaSourceFilewhile(137