{"id":151124,"date":"1993-01-01T00:00:00","date_gmt":"1993-01-01T00:00:00","guid":{"rendered":"https:\/\/cm-edgetun.pages.dev\/en-us\/research\/msr-research-item\/duel-a-very-high-level-debugging-language\/"},"modified":"2018-10-16T20:21:08","modified_gmt":"2018-10-17T03:21:08","slug":"duel-a-very-high-level-debugging-language","status":"publish","type":"msr-research-item","link":"https:\/\/cm-edgetun.pages.dev\/en-us\/research\/publication\/duel-a-very-high-level-debugging-language\/","title":{"rendered":"Duel &#8211; A Very High-Level Debugging Language"},"content":{"rendered":"<div class=\"asset-content\">\n<p>Most source-level debuggers accept expressions in the source language, e.g., C, and can print source-language values. This approach is usually justified on grounds that programmers need to know only one language. But the evaluation of source-language expressions or even statements is poorly suited for making non-trivial queries about the program state, e.g., &#8220;which elements of array x[100] are positive?&#8221; Duel departs from the conventional wisdom: it is a very high-level language designed specifically for source-level debugging of C programs. Duel expressions are a superset of C&#8217;s and include &#8220;generators&#8221;, which are expressions that can produce zero or more values and are inspired by Icon, APL, and LISP. For example, x[&#8230;100]>? 0 displays the positive elements of x and their indices. Duel is implemented on top of gdb and adds one new command to evaluate Duel expressions and display their results. This paper describes Duel&#8217;s semantics and syntax, gives examples of its use, and outline its implementation. Duel is freely available, and it could be interfaced to other debuggers.<\/p>\n<\/div>\n<p><!-- .asset-content --><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Most source-level debuggers accept expressions in the source language, e.g., C, and can print source-language values. This approach is usually justified on grounds that programmers need to know only one language. But the evaluation of source-language expressions or even statements is poorly suited for making non-trivial queries about the program state, e.g., &#8220;which elements of [&hellip;]<\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"msr-url-field":"","msr-podcast-episode":"","msrModifiedDate":"","msrModifiedDateEnabled":false,"ep_exclude_from_search":false,"_classifai_error":"","msr-author-ordering":null,"msr_publishername":"Advanced Computing Systems Association","msr_publisher_other":"","msr_booktitle":"","msr_chapter":"","msr_edition":"","msr_editors":"","msr_how_published":"","msr_isbn":"","msr_issue":"","msr_journal":"","msr_number":"","msr_organization":"","msr_pages_string":"","msr_page_range_start":"","msr_page_range_end":"","msr_series":"","msr_volume":"","msr_copyright":"","msr_conference_name":"","msr_doi":"","msr_arxiv_id":"","msr_s2_paper_id":"","msr_mag_id":"","msr_pubmed_id":"","msr_other_authors":"David R. 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