VDM-10 Language Manual

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$Course Material\Efficiently Coding Communication Protocols in C++ ...$

VDM-10 Language Manual ✡✝ | sc in set gps(gp)}}; ✆ The externals field lists the state/instance variables that the operation will manipulate. The state/instance variables listed after the reserved word rd can only be read whereas the operation can both read and write the variables listed after wr. In VDM-SL these pre- and post-conditions the interpreter also creates new functions as with the pre- and post-conditions of operation definitions. However, if a specification contains a global state, the state is also part of the newly created functions. Thus, functions with the following signatures are created for operations with pre- and/or post-conditions 1 : ✞ pre_Op : InType * State +> bool ✡✝ post_Op : InType * OutType * State * State +> bool ✆ with the following exceptions: • If the operation does not take any arguments, the InType part of the signature is left out in both the pre Op and post Op signatures. • If the operation does not return a value, the OutType part is left out in the post Op signature. • If the specification does not define a state, the State part(s) of both signatures are left out. In the post Op signature, the first State part is for the old state, whereas the second State part is for the state after the operation call. For instance, consider the following specifications: ✞ module A definitions state St of n : nat end operations Op1 (a : nat) b :nat 1 However, you should remember that these pre and post condition predicates for an operation are simply boolean functions and the state components are thus not changed by calling such a predicate. 92
Chapter 12. Operation Definitions pre a > 0 post b = 2 * a; Op2 () b : nat post b = 2; Op3 () post true end A ✡✝ ✆ ✞ module B definitions operations Op1 (a : nat) b : nat pre a > 0 post b = 2 * a; Op2 () b : nat post b = 2; Op3 () post true end B ✡✝ ✆ For module A we could then quote the pre and post conditions defined in this specification as illustrated below 93
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Overture - Open-source Tools for Fo
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Contents 1 Introduction 1 1.1 The V
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CONTENTS 13 Statements 97 13.1 Let
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CONTENTS A.7.19 The Undefined Expre
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Chapter 1 Introduction The Vienna D
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Chapter 2 Concrete Syntax Notation
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Chapter 3 Data Type Definitions As
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Chapter 3. Data Type Definitions We
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Chapter 3. Data Type Definitions Op
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Chapter 3. Data Type Definitions (a
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Chapter 3. Data Type Definitions
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Chapter 3. Data Type Definitions m1
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Chapter 3. Data Type Definitions Sy
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Chapter 3. Data Type Definitions Th
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Chapter 3. Data Type Definitions to
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Chapter 4 Algorithm Definitions In
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Chapter 5 Function Definitions In t
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Chapter 5. Function Definitions Not
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Chapter 5. Function Definitions Thi
Page 49 and 50: Chapter 6 Expressions In this subse
Page 51 and 52: Chapter 6. Expressions ✡✝ mk_Sc
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Page 55 and 56: Chapter 6. Expressions where e1 is
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Page 59 and 60: Chapter 6. Expressions where bd is
Page 61 and 62: Chapter 6. Expressions 6.8 Sequence
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Page 65 and 66: Chapter 6. Expressions mu operator.
Page 67 and 68: Chapter 6. Expressions new expressi
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Page 71 and 72: Chapter 6. Expressions which will r
Page 73 and 74: Chapter 6. Expressions Examples: As
Page 75 and 76: Chapter 6. Expressions • #active(
Page 77 and 78: Chapter 6. Expressions ✞ state si
Page 79 and 80: Chapter 6. Expressions Semantics: A
Page 81 and 82: Chapter 7 Patterns Syntax: pattern
Page 83 and 84: Chapter 7. Patterns In the followin
Page 85 and 86: Chapter 7. Patterns ✡✝ ✆ The
Page 87 and 88: Chapter 8 Bindings Syntax: bind = s
Page 89 and 90: Chapter 9 Value (Constant) Definiti
Page 91 and 92: Chapter 10 Instance Variables (VDM+
Page 93 and 94: Chapter 11 The State Definition (VD
Page 95 and 96: Chapter 11. The State Definition (V
Page 97 and 98: Chapter 12 Operation Definitions Op
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Page 105 and 106: Chapter 13 Statements In this secti
Page 107 and 108: Chapter 13. Statements ✡✝ def t
Page 109 and 110: Chapter 13. Statements block return
Page 111 and 112: Chapter 13. Statements Examples: Th
Page 113 and 114: Chapter 13. Statements elseif state
Page 115 and 116: Chapter 13. Statements ‘do’, st
Page 117 and 118: Chapter 13. Statements 13.7 The Whi
Page 119 and 120: Chapter 13. Statements ✡✝ (dcl
Page 121 and 122: Chapter 13. Statements ✞ ✡✝ R
Page 123 and 124: Chapter 13. Statements where expres
Page 125 and 126: Chapter 13. Statements result of th
Page 127 and 128: Chapter 13. Statements ✡✝ else
Page 129 and 130: Chapter 13. Statements ✞ bootSequ
Page 131 and 132: Chapter 13. Statements ✞ op1 : na
Page 133 and 134: Chapter 14 Top-level Specification
Page 135 and 136: Chapter 14. Top-level Specification
Page 145 and 146: Chapter 15 Synchronization Constrai
Page 147 and 148: Chapter 15. Synchronization Constra
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Chapter 15. Synchronization Constra
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Chapter 16 Threads (VDM++ and VDM-R
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Chapter 16. Threads (VDM++ and VDM-
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Chapter 16. Threads (VDM++ and VDM-
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Chapter 17 Top-level Specification
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Chapter 17. Top-level Specification
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Chapter 18 Trace Definitions In ord
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Chapter 18. Trace Definitions stack
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Chapter 19 Static Semantics VDM spe
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Chapter 20 Scope Conflicts (VDM++ a
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References [Ada LRM] [Bicarregui&94
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Chapter 20. Scope Conflicts (VDM++
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Appendix A The Syntax of the VDM La
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Appendix A. The Syntax of the VDM L
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Appendix B Lexical Specification B.
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Appendix B. Lexical Specification B
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Appendix B. Lexical Specification S
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Appendix C Operator Precedence The
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Appendix C. Operator Precedence eva
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Appendix C. Operator Precedence pre
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Appendix D Differences between the
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Index abs, 9 and, 6 card, 14 comp f
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INDEX arithmetic minus, 185 arithme
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INDEX boolean type, 6 char, 11 func
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INDEX sequence enumeration, 53, 187
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