Hermes: A Tutorial and Reference Manual - Researcher - IBM

More documents

Recommendations

Info

wrap(continued) Preconditions: var(source) var(polymorph) polymorphprecondition(source) AppendixB.HermesOperations193 Description:Coercesourceasnecessarytoloweritstypestatetothat Postconditions: Qualier:wrap typestateandstoretheresultinpolymorph,leavingsourceuninitialized. givenintheinstructionqualier.Thenwrapitupwithitstypeand makeuninit(source) makeinit(polymorph) Seex11.9,p.125
AppendixC PredenedModule Thisappendixprovidesacompletelistingofthepredefined.ddenitions module.ThepredefinedmoduleisimplicitlyimportedbyallHermes enforceassignment-styletyperules.Forexample,theoperationdescription modules.Itcontainsallthetypedenitionsrequiredbythecompilerto forthelatterisalsoincluded. thedenitionofprogrammakesuseofpredefined!processid,adenition causeitisreferencedinthetyperulesforcreateandprocedure.Since function.Manytypesaredenedinpredefinedbecausethemodulemust predefined!integer.Thustheremustbeatypenamedintegerdened becompletelyself-contained.Forexample,typeprogramisincludedbe- inadenitionsmodulenamedpredefinedinorderforthecompilerto fortheinsert-atoperationrequiresthatthepositionargumentbeoftype predefined. writeaHermesapplicationthatmakesnoexplicituseofanythingfrom chosenforinclusionistheonepresentedabove.Itisnotuncommonto provideacollectionoftypedenitionsthatpeoplewillndgenerallyuseful intheirprogramming.Theonlycriterionbywhichatypedenitionis whichisusedtorepresentabstractHermesprograms.Anyprogramthat intendstomanipulateHermesprogramobjectsasdatawillnecessarilydependheavilyonthedenitionsinpredefined. Thevastmajorityofthemodulecentersaroundthetypepredefined!program, Itshouldbestressedthatthepredefinedmoduleisnotintendedto
Page 1 and 2:
DavidF.BaconArthurP.GoldbergAndyLow
Page 3 and 4:
Preface Thisdocumentcontainsatutori
Page 5 and 6:
iv3TypeandTypestateChecking 5Resear
Page 8:
Tutorial PartI 1
Page 11 and 12:
ortransactions.AHermesmoduleisastra
Page 13 and 14:
61.2.GettingStarted|ASimpleHermesPr
Page 15 and 16:
81.2.GettingStarted|ASimpleHermesPr
Page 17 and 18:
101.2.GettingStarted|ASimpleHermesP
Page 19 and 20:
121.4.PuttingProcessesTogether thec
Page 21 and 22:
141.4.PuttingProcessesTogether newI
Page 23 and 24:
fullycheckedfortypeandtypestateerro
Page 25 and 26:
constructs:thenewinput-port,connect
Page 27 and 28:
201.5.DeclarationsandDenitions whil
Page 29 and 30:
221.5.DeclarationsandDenitions Stan
Page 31 and 32:
whichtheoutputportconnects|calledth
Page 33 and 34:
261.6.ASimpleServer begin QuitCM:Qu
Page 35 and 36:
281.6.ASimpleServer towritedataabst
Page 37 and 38:
toaservice,whileretainingtheability
Page 39 and 40:
322.1.Requirements PutLine PutLine
Page 41 and 42:
342.3.Interfaces WMInterface:callme
Page 43 and 44:
asmallchangetotheinterfaceFilter.Re
Page 45 and 46:
382.5.Front-endProcess callParms.Ge
Page 47 and 48:
402.5.Front-endProcess paringavalue
Page 49 and 50:
ationtable[expr].Wehaveencounteredt
Page 51 and 52:
ishiddenandinnowayaectsthesemantics
Page 53 and 54:
462.7.TheWindowManager callCurrentW
Page 55 and 56:
name.Ifwewaitedtobuildtheapplicatio
Page 57 and 58:
502.8.CreatingaWindowApplication re
Page 59 and 60:
522.8.CreatingaWindowApplication be
Page 61 and 62:
examplesillustratedhere. errorhandl
Page 63 and 64:
563.TypeandTypestateChecking anerro
Page 65 and 66:
583.TypeandTypestateChecking Therei
Page 67 and 68:
604.1.ExpressionBlocks anexpression
Page 69 and 70:
624.3.Variants thevariantcomponents
Page 71 and 72:
thetypestate(i.e.addattributes),but
Page 73 and 74:
accesscontrol{anyonecangetit. 664.4
Page 75 and 76:
685.ResearchDirectionsinHermes
Page 78 and 79:
6Introduction Thereferencemanualpre
Page 80 and 81:
7LexicalandSyntacticRules lectionso
Page 82 and 83:
8Resolution name,attributename,exce
Page 84 and 85:
8.1.2ComponentNames eachhaveacompon
Page 86 and 87:
onthehandlerandusedontheexitstateme
Page 88 and 89:
theelementwillalsobeknownbyapplying
Page 90 and 91:
documentationpurposesevenwheretheya
Page 92 and 93:
ments.Therstargumenttocasemustbeava
Page 94 and 95:
Ifinit(CM)ispresentandCMisacallmess
Page 96 and 97:
6.Determinethepostconditionsforeach
Page 98 and 99:
droppedattributesafternormalcomplet
Page 100 and 101:
11 HermesOperations Throughoutthere
Page 102 and 103:
Thediscardstatementremovesthevaluef
Page 104 and 105:
Ifnoneoftheclausescanexitsnormally,
Page 106 and 107:
Ifthereisanoptionalselectexpression
Page 108 and 109:
stmemberisanatomwithprintnamematchi
Page 110 and 111:
types.Additionally,theoperations\an
Page 112 and 113:
Less,Less-equal,Greater,Greater-equ
Page 114 and 115:
RecordTypeFamily 11.5RecordOperatio
Page 116 and 117:
valueofthetable,ifany,isdiscarded.
Page 118 and 119:
thetableisordered,theelementisinser
Page 120 and 121:
notallowedonconstantcopies.Avariabl
Page 122 and 123:
thereisnoselectedelement,aNotFounde
Page 124 and 125:
willbeuninitialized,andthedestinati
Page 126 and 127:
Itistheabilityforprogramstosendandr
Page 128 and 129:
Connect Theconnectstatementhastwoop
Page 130 and 131:
possible,andstoresitinadestinationv
Page 132 and 133:
incompatiblewiththeinputporttypeoft
Page 134 and 135:
Inspect-polymorph willincludefinit(
Page 136 and 137:
theprogramwhichembedsit.Thereforeth
Page 138 and 139:
type).Ifthecheckfails,theexceptionD
Page 140 and 141:
isusuallygeneratedasacoercionwhenme
Page 142 and 143:
A.1LexicalRules Webeginwiththerules
Page 144 and 145:
accuracy against andy assert drop e
Page 146 and 147:
Thesimplestatements: simple{stateme
Page 148 and 149:
oolean{guard event{guard::=eventinp
Page 150 and 151: ::=(expression)AppendixA.HermesConc
Page 152 and 153: user{exception constant{parameters
Page 154 and 155: formal{variable module{name::=ident
Page 156 and 157: Typestatesappearinginparticularcont
Page 158 and 159: destination,source,andposition.Some
Page 160 and 161: operandwillnolongerbeinitialized. B
Page 162 and 163: Followingaretheinferencefunctionsap
Page 164 and 165: lowestentrycondition(message,port):
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
Page 178 and 179: forall(continued) Description:Ifeve
Page 180 and 181: greater(continued) Description:Ifso
Page 182 and 183: insert{at(table,element,position) T
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
Page 192 and 193: emove(element,table) TypeRules: App
Page 194 and 195: select(continued) SpecialRules:Allt
Page 196 and 197: subtract(result,source1,source2) Ty
Page 198 and 199: unary{minus(result,source) TypeRule
Page 202 and 203: definitions predefined:using() Appe
Page 204 and 205: );'named'->typename:typenameffullg
Page 206 and 207: {{Specicinformationneededtocomplete
Page 208 and 209: attrdefinition:record( attributeid:
Page 210 and 211: statement:record( id:statementid, o
Page 212 and 213: {{Ablockstatementqualieridentiesthe
Page 214 and 215: {{expressionisfalse. ifqualifier:re
Page 216 and 217: {{expression.The'element'rootvariab
Page 218 and 219: [ASU88]AlfredV.Aho,RaviSethi,andJer
Page 220 and 221: [SYB87a]RobertE.Strom,ShaulaAlexand
Page 222 and 223: AppendixC.PredenedModule215 coercio
Page 224 and 225: AppendixC.PredenedModule217 dening,
Page 226: variablename discarded,29 variant,6
show all

Hermes: A Tutorial and Reference Manual - Researcher - IBM

Create successful ePaper yourself

Delete template?

Save as template?