Comments on: Pondering Pre/Post Conditions to Enforce Software Correctness http://blog.mozilla.com/tglek/2007/07/13/pondering-prepost-conditions-to-enforce-software-correctness/ Just another Blog.mozilla.com weblog Sun, 12 Feb 2012 07:38:09 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: Brendan Eich http://blog.mozilla.com/tglek/2007/07/13/pondering-prepost-conditions-to-enforce-software-correctness/comment-page-1/#comment-2229 Brendan Eich Tue, 17 Jul 2007 02:41:36 +0000 http://blog.mozilla.com/tglek/2007/07/13/pondering-prepost-conditions-to-enforce-software-correctness/#comment-2229 ES4 does have extensible type annotations for args and return values, and it will enforce them at runtime if it can't prove they're violated with its optional static checker. But no rule inference, no data flow analysis, etc. Non-nullable types must be initialized early enough, for class instance vars with special constructor syntax. See http://ecmascript-lang.org/ for the reference implementation, which supports a lot (but not all, and not all bug-free) of what will be in ES4. /be ES4 does have extensible type annotations for args and return values, and it will enforce them at runtime if it can’t prove they’re violated with its optional static checker. But no rule inference, no data flow analysis, etc. Non-nullable types must be initialized early enough, for class instance vars with special constructor syntax.

See http://ecmascript-lang.org/ for the reference implementation, which supports a lot (but not all, and not all bug-free) of what will be in ES4.

/be

]]> By: tglek http://blog.mozilla.com/tglek/2007/07/13/pondering-prepost-conditions-to-enforce-software-correctness/comment-page-1/#comment-2092 tglek Fri, 13 Jul 2007 18:16:09 +0000 http://blog.mozilla.com/tglek/2007/07/13/pondering-prepost-conditions-to-enforce-software-correctness/#comment-2092 I guess I forgot to mention the key point of this. The BoogiePL contracts are enforced at compile time so your program is rejected if it doesn't comply. However Spec# also complements these with runtime checks when only part of the code is annotated. I suppose something similar would be possible with es4 I guess I forgot to mention the key point of this. The BoogiePL contracts are enforced at compile time so your program is rejected if it doesn’t comply. However Spec# also complements these with runtime checks when only part of the code is annotated.

I suppose something similar would be possible with es4

]]> By: Alex Vincent http://blog.mozilla.com/tglek/2007/07/13/pondering-prepost-conditions-to-enforce-software-correctness/comment-page-1/#comment-2091 Alex Vincent Fri, 13 Jul 2007 18:05:39 +0000 http://blog.mozilla.com/tglek/2007/07/13/pondering-prepost-conditions-to-enforce-software-correctness/#comment-2091 Hm, like a design-by-contract library for JavaScript? Or xpcshell tests? Or perhaps the D language? Hm, like a design-by-contract library for JavaScript? Or xpcshell tests? Or perhaps the D language?

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