Hermes: A Tutorial and Reference Manual - Researcher - IBM

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Thesimplestatements: simple{statement ::=result{variable:=source{expression AppendixA.HermesConcreteSyntax139 ::=assertattribute ::=calloutport{variablecall{arguments ::=call(outport{expression)call{arguments ::=checkdenitionsdenitions{module{variable againstdenitions{library{variable source{expression ::=connectoutport{variabletoinport{variable ::=dropattribute ::=discardvariable{name ::=exitexit{name ::=dissolvevariant{componentintoresult{variable ::=extracttable{variablefromselector ::=insertelement{expressionintotable{variable ::=hidevariant{variable ::=mergetable{expressionintotable{variable ::=newvariable{name ::=printexpression ::=receivecallmessage{variablefrominport{variable ::=removeelement{variablefromselector ::=returncallmessage{variable [atposition{expression] ::=revealvariant{component ::=sendsource{expressiontooutport{expression ::=unitevariant{componentfromsource{expression ::=unwrapresult{variable [exceptionuser{exception{name] Thecompoundstatements: ::=wrapsource{expressionaspolymorph{variable frompolymorph{expressionunwrapped{typestate
140A.2.SyntacticRules compound{statement ::=block begin [declaration{section] [constant{section] ::=forenumeration{variable:enumeration{typerepeat ::=forselectorinspect endfor endblock [handler]... [statement;]... ::=inspectdeclaration ::=inspectselectorbegin ::=iftest{expression endif frompolymorph{expressioninspect{typestate [else[statement;]...] then[statement;]... ::=select[select{expression] endinspect [statement;]... Varioussyntacticelementsappearingincompoundstatements: ::=whiletest{expressionrepeat endselect [select{clause]... constant{sectionendwhile [statement;]... otherwise{clause select{clause::=boolean{guard[statement;]... handler::=on([exception{name[,exception{name]...]) ::=constant([base{variable[,base{variable]...]) ::=onexit([exit{name[,exit{name]...])
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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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Page 100 and 101: 11 HermesOperations Throughoutthere
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Page 142 and 143: A.1LexicalRules Webeginwiththerules
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Page 154 and 155: formal{variable module{name::=ident
Page 156 and 157: Typestatesappearinginparticularcont
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Page 162 and 163: Followingaretheinferencefunctionsap
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Page 166 and 167: copy(source,destination):Foreachatt
Page 168 and 169: assert(continued) Description:Evalu
Page 170 and 171: case(continued) Description:Copythe
Page 172 and 173: copy(continued) Preconditions: unco
Page 174 and 175: drop(continued) SpecialRules:Thenum
Page 176 and 177: exists(continued) SpecialRules:Thes
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Page 180 and 181: greater(continued) Description:Ifso
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Page 184 and 185: integer{literal(result) TypeRules:
Page 186 and 187: merge{at(continued) Description:Rem
Page 188 and 189: not(result,source) TypeRules: Appen
Page 190 and 191: print(variable) TypeRules:None Prec
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subtract(result,source1,source2) Ty
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unary{minus(result,source) TypeRule
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wrap(continued) Preconditions: var(
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definitions predefined:using() Appe
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);'named'->typename:typenameffullg
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{{Specicinformationneededtocomplete
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attrdefinition:record( attributeid:
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statement:record( id:statementid, o
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{{Ablockstatementqualieridentiesthe
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{{expressionisfalse. ifqualifier:re
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{{expression.The'element'rootvariab
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[ASU88]AlfredV.Aho,RaviSethi,andJer
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[SYB87a]RobertE.Strom,ShaulaAlexand
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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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