Hermes: A Tutorial and Reference Manual - Researcher - IBM

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copy(continued) Preconditions: uncopyable(source) var(result) init(source) AppendixB.HermesOperations165 Description:Makeacopyoftheobjectstoredinsource,andstorethe Qualier:absent copyinresult. Postconditions: copy(source,result) create(result,program)Exceptions:Depletion,InterfaceMismatch TypeRules: Preconditions: result2outport predefined!program Seex11.1,p.94 Description:Instantiateprogramasaprocess,andstoreanoutputport Qualier:absent var(result) checked(program) connectedtotheprocess'initializationportinresult. Postconditions: currentprogram(result) makeinit(result) TypeRules: Preconditions: result var(result) predefined!programPostconditions: makechecked(result) Exceptions:Depletion Seex11.8,p.124 Description:Storeacopyoftheprogramobjectfromwhichtheexecuting Qualier:absent discard(variable) TypeRules:None Preconditions: processwasinstantiated,intoresult. var(variable) Postconditions: makeuninit(variable) Seex11.10,p.129 Exceptions:|
166B.6.OperationDescriptions discard(continued) Description:Discardtheobjectstoredinvariable,leavingvariableuninitialized. Qualier:absent dissolve(result,varcomp) TypeRules: Preconditions: resultvarcomp varcomp2variantcomponent Exceptions:Depletion Seex11.1,p.95 Description:Movetheobjectstoredinvariantcomponentvarcompinto Qualier:absent casets(varcomp,varcomp) result,leavingthevariantofwhichvarcompisacomponentuninitialized. Postconditions: movets(varcomp,result) killvariant(varcomp) var(varcomp) var(result) divide(result,source1,source2)Exceptions:Depletion,DivideByZero TypeRules: Preconditions: source12numeric result2numeric resultsource1source2 source22numericSeex11.7,p.116 Description:Storethequotientofsource1dividedbysource2inresult. Qualier:absent var(result) init(source2) init(source1) Postconditions: drop(...) makeinit(result) TypeRules:SeeSpecialRules Preconditions:None Postconditions:None Seex11.4,p.104 Exceptions:|
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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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522.8.CreatingaWindowApplication be
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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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Page 166 and 167: copy(source,destination):Foreachatt
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Page 176 and 177: exists(continued) SpecialRules:Thes
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Page 186 and 187: merge{at(continued) Description:Rem
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Page 194 and 195: select(continued) SpecialRules:Allt
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Page 202 and 203: definitions predefined:using() Appe
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AppendixC.PredenedModule215 coercio
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AppendixC.PredenedModule217 dening,
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variablename discarded,29 variant,6
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