Hermes: A Tutorial and Reference Manual - Researcher - IBM

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drop(continued) SpecialRules:Thenumberofoperandsmustequalthenumberofparametersdeclaredinthedenitionoftheattributenamedinthestatement AppendixB.HermesOperations167 attributeparameter. qualier.Eachoperandmustalsomatchthetypeofthecorresponding Description:Removetheconstraintidentiedbytheinstructionquali- Qualier:constraintname empty(result,inport) TypeRules: er,appliedtothegivenoperands,fromthecurrentprogramtypestate. Preconditions: result2boolean init(inport) inport2inport Exceptions:Depletion Seex11.11,p.132 Description:Iftherearemessagesqueuedforreceiptoninport,setresult Qualier:absent var(result) tofalse.Otherwisesetresulttotrue. Postconditions: equal(result,source1,source2) makeinit(result) TypeRules: Preconditions: result2boolean init(source1) source1source2 Exceptions:Depletion Seex11.8,p.120 Description:Ifsource1andsource2areindistinguishableobjects,set Qualier:absent var(result) resulttotrue.Otherwisesetresulttofalse. init(source2) Postconditions: makeinit(result) every(result,table) TypeRules: result2table table2copyable SeealsoSpecialRules Exceptions:Depletion,(Uncopyable) table2table resulttableSeex11.1,p.94
168B.6.OperationDescriptions every(continued) Preconditions: SpecialRules:Thestatementqualierisaselector.Theresultvariable init(table) uncopyable(table) var(result) SeealsoSpecialRules Postconditions: typeoftheelementvariableidentiedintheselectormustbetheelementtypeoftable.Theentrytypestatefortheselectoristheentry theeverystatementiscomputedbyapplyingthepostconditionrules listedabovetothenormalexittypestateoftheselector,minusanyattributesinvolvingtheresultorelementvariable.SeeSectionfora typestateoftheeverystatement.Thetypestateonnormalexitfrom identiedinthatselectormustbeoftypepredefined!booleanand musthavetheinitattributeonnormalexitfromtheselector.The SeealsoSpecialRules makeinit(result) Description:Createanewtablecontainingacopyofeveryelementof Qualier:selector andstorethenewtableinresult.Iftableisordered,theelementsin tablethatsatisestheselectoridentiedintheinstructionqualier, resultappearinthesamerelativeorderastheydointable. discussionofhowtypestatesarecomputedforselectors. exists(result,table) TypeRules: Preconditions: result2boolean table2table Exceptions:Depletion Seex11.6,p.110 init(table) SeealsoSpecialRules var(result) Postconditions: SeealsoSpecialRules makeinit(result)
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DavidF.BaconArthurP.GoldbergAndyLow
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Preface Thisdocumentcontainsatutori
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iv3TypeandTypestateChecking 5Resear
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Tutorial PartI 1
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ortransactions.AHermesmoduleisastra
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61.2.GettingStarted|ASimpleHermesPr
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81.2.GettingStarted|ASimpleHermesPr
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101.2.GettingStarted|ASimpleHermesP
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121.4.PuttingProcessesTogether thec
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141.4.PuttingProcessesTogether newI
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fullycheckedfortypeandtypestateerro
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constructs:thenewinput-port,connect
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201.5.DeclarationsandDenitions whil
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221.5.DeclarationsandDenitions Stan
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whichtheoutputportconnects|calledth
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261.6.ASimpleServer begin QuitCM:Qu
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281.6.ASimpleServer towritedataabst
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toaservice,whileretainingtheability
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322.1.Requirements PutLine PutLine
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342.3.Interfaces WMInterface:callme
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asmallchangetotheinterfaceFilter.Re
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382.5.Front-endProcess callParms.Ge
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402.5.Front-endProcess paringavalue
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ationtable[expr].Wehaveencounteredt
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ishiddenandinnowayaectsthesemantics
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462.7.TheWindowManager callCurrentW
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name.Ifwewaitedtobuildtheapplicatio
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502.8.CreatingaWindowApplication re
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examplesillustratedhere. errorhandl
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563.TypeandTypestateChecking anerro
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583.TypeandTypestateChecking Therei
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604.1.ExpressionBlocks anexpression
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624.3.Variants thevariantcomponents
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thetypestate(i.e.addattributes),but
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accesscontrol{anyonecangetit. 664.4
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685.ResearchDirectionsinHermes
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6Introduction Thereferencemanualpre
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7LexicalandSyntacticRules lectionso
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8Resolution name,attributename,exce
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8.1.2ComponentNames eachhaveacompon
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onthehandlerandusedontheexitstateme
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theelementwillalsobeknownbyapplying
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documentationpurposesevenwheretheya
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ments.Therstargumenttocasemustbeava
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Ifinit(CM)ispresentandCMisacallmess
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6.Determinethepostconditionsforeach
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droppedattributesafternormalcomplet
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11 HermesOperations Throughoutthere
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Thediscardstatementremovesthevaluef
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Ifnoneoftheclausescanexitsnormally,
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Ifthereisanoptionalselectexpression
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stmemberisanatomwithprintnamematchi
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types.Additionally,theoperations\an
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Less,Less-equal,Greater,Greater-equ
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RecordTypeFamily 11.5RecordOperatio
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valueofthetable,ifany,isdiscarded.
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thetableisordered,theelementisinser
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notallowedonconstantcopies.Avariabl
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thereisnoselectedelement,aNotFounde
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Page 202 and 203: definitions predefined:using() Appe
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AppendixC.PredenedModule217 dening,
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variablename discarded,29 variant,6
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