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总复习Prof.CHENJianSouthChinaUniversityofTechnology
TargetcodeSourcecodeScannerParserSemanticanalyzerSourcecodeoptimizer/IntermediatecodegeneratorCodegeneratorTargetcodeoptimizerTokensSyntaxTreeAnnotatedTree注释树Intermediatecode中间代码TargetcodeIdentifylogicalpiecesofthedescription.Identifyhowthosepiecesrelatetoeachother.Identifythemeaningoftheoverallstructure.DesignonepossiblestructureandSimplifytheintendedstructureFabricatethestructureImprovetheresultingstructureLiteraltable文字表Symboltable符号表Errorhandler错误处理程序Auxiliarycomponentsthatinteractwithsomephases2
LexicalAnalysisProf.CHENJianSouthChinaUniversityofTechnology
LexicalAnalysisDefinethetokenswithaRegularExpressionCreatetheequivalentNFAConstructtheequivalentDFAMinimizingtheequivalentDFA4
ExamplePleasewritearegularexpressionforallstringsofa’sandb’swhichcontaintwoconsecutive(连续的)a’sorb’s.(a|b)*(aa|bb)(a|b)*5
ConverttheregularexpressintoNFA4f35621i????aaaabbbb6
ConverttheNFAintoDFAbysubsetconstruction.TheTransitiontableisrequired.{i,1,2}IaIb{1,2,3}{1,2,3}{1,2,4}{1,2,4}{1,2,3,5,6,f}{1,2,3,5,6,f}{1,2,3,5,6,f}{1,2,3,6,f}{1,2,3,6,f}{1,2,4,5,6,f}{1,2,4,6,f}{1,2,4,5,6,f}{1,2,4,5,6,f}{1,2,4,6,f}S{1,2,3}A{1,2,4}B{1,2,3,5,6,f}C{1,2,4,5,6,f}D{1,2,4,6,f}E{1,2,3,6,f}FACACFFCBBDEDDE4f35621i????aaaabbbb7
SbAaaCaaBbbDbEbbabFaFa8
MinimizingtheNumberofStatesinaDFAaCDBAEFSbaaaaabbbbbabF1.SplitintoacceptingstatessetsandNonacceptingstatessets
{S,A,B}{C,D,E,F}2.Continuetosplit‘a’:{S,A,B}={S,B}{A}
{C,D,E,F}={C,D,E,F}‘b’:{S,B}{A}={S}{A}{B}
{C,D,E,F}={C,D,E,F}3.LetDrepresents{C,D,E,F}MinimizedDFAP={S,A,B,D}DBASaaabbbba9
Context-FreeGrammarsandParsingProf.CHENJianSouthChinaUniversityofTechnology
Context-FreeGrammarsandParsingTheParsingProcessContext-FreeGrammars上下文无关文法ParseTreesandAbstractSyntaxTree分析树和抽象语法
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