By C. T. Sennett (auth.), C. T. Sennett (eds.)
4. three The Gypsy language seventy two four. four The Gypsy Verification surroundings seventy three four. five an easy instance eighty one four. 6 Specification facts kinds ninety one four. 7 destiny instructions ninety five a hundred four. eight Conclusions five trustworthy programming in usual languages 102 Bernard Carre, software Validation Ltd. five. 1 creation 102 five. 2 Language standards for high-integrity programming 103 five. three using regular languages 108 five. four Programming in Pascal and Ada one hundred ten 1'19 five. five sensible stories NewSpeak: a competent programming language 6 122 I. F. Currie, Royal indications and Radar institution 6. 1 creation 122 6. 2 kinds and values 127 6. three Declarations and variables 132 6. four Guarded declarations 134 6. five circumstances and conditionals 136 6. 6 Loops 138 6. 7 methods one hundred forty 6. eight Assertions one hundred forty five 6. nine Timing 147 6. 10 end 149 6. eleven Appendix 1: precis of syntax a hundred and fifty 6. 12 Appendix 2: sort lattice and widening 156 7 software research and systematic trying out 159 M. A. Hennell, collage of Liverpool, and D. Hedley and that i. J. Riddell, Liverpool info examine affiliates Ltd. 7. 1 creation 159 7. 2 the fundamental requirement one hundred sixty 7. three The Liverpool adventure 161 7. four The Liverpool experiments 162 7. five The LDRA Testbeds 163 Interpretation 169 7. 6 7. 7 Applicability and advantages 171 7. eight Safety-critical structures 173 VI eight application research and verification 176 Bernard Carre, software Validation Ltd. eight. 1 advent 176 8.
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The components, which themselves may be viewed as systems in their own right, may be categorized as being either synchronously or asynchronously related to the design which employs them. Synchronous components are passive and, when invoked by their calling environment, will complete before the environment may resume, whereas asynchronous components are active and, once invoked, will operate asynchronously with their environment. The top-down decomposition of a sequential program into a hierarchy of procedures is a common form of design using synchronous components.
If no exception handler exists in a block for a particular exception, then the exception is propagated out to the enclosing block (which caused the inner block to be executed) and a handler is sought for it there. This outward propagation continues until either a handler is found or the exception is propagated out of the program to the environment. If a suitable handler is found, it is executed and then control is transferred out of the block where the handler resides to the enclosing block, that is, an exception results in a premature exit from the block.
Interface exceptions raised from the component level are also of value since they provide error detection to the design level which utilizes the component. They are very similar in nature to the exceptions raised by error detection mechanisms since both indicate that the design at a certain level is misusing the facilities which are provided for it. Logically, the 46 components of a design could be viewed as an extension to the virtual machine on which the design executes and, continuing this rationalization, suggests that the virtual machine should also be capable of raising failure exceptions.