VDM-10 Language Manual

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

VDM-10 Language Manual ✡✝ occurs : seq1 of char * seq1 of char -> bool occurs (substr,str) == exists i,j in set inds str & substr = str(i,...,j); ✆ 80
Chapter 9 Value (Constant) Definitions The VDM languages supports the definition of constant values. A value definition corresponds to a constant definition in traditional programming languages. Syntax: value definitions = ‘values’, [ access value definition ], { ‘;’, access value definition }, [ ‘;’ ] ; access value definition = ([ access ], [ ‘static’ ]) | ([ ‘static’ ], [ access ]), value definition ; value definition = pattern, [ ‘:’, type ], ‘=’, expression ; Semantics: The value definition has the form: ✞ ✡✝ values access pat1 = e1; ... access patn = en ✆ where the access part only can be used in VDM++ and VDM-RT. The global values (defined in a value definition) can be referenced at all levels in a VDM specification. However, in order to be able to execute a specification these values must be defined before they are used in the sequence of value definitions. This “declaration before use” principle is only used by the interpreter for value definitions. Thus for instance functions can be used before they are declared. In standard VDM-SL there are not any restrictions on the order of the definitions at all. It is possible to provide a type restriction as well, and this can be useful in order to obtain more exact type information. Details of the VDM++ and VDM-RT access and static specifiers can be found in section 14.4. 81
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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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Page 41 and 42: Chapter 4 Algorithm Definitions In
Page 43 and 44: Chapter 5 Function Definitions In t
Page 45 and 46: Chapter 5. Function Definitions Not
Page 47 and 48: 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
Page 57 and 58: Chapter 6. Expressions all expressi
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.
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Page 77 and 78: Chapter 6. Expressions ✞ state si
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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: Chapter 8 Bindings Syntax: bind = s
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
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Page 109 and 110: Chapter 13. Statements block return
Page 111 and 112: Chapter 13. Statements Examples: Th
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Page 115 and 116: Chapter 13. Statements ‘do’, st
Page 117 and 118: Chapter 13. Statements 13.7 The Whi
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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
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Chapter 14. Top-level Specification
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Chapter 15 Synchronization Constrai
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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 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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