By Raimondas Lencevicius (auth.)
Object relationships in glossy software program structures have gotten more and more a variety of and intricate, and application blunders as a result of violations of item relationships are tough to notice. Programmers want new instruments that permit them to discover gadgets in a wide process extra successfully and to realize damaged item relationships without delay. Such instruments comprise ways utilized in such parts as information visualization, trend matching and extraction, database querying, lively databases, and rule-based programming. The query-based debugging strategy constructed via the writer of this booklet is one other strong but effective device to be additional to the developer's device chest.
Advanced Debugging Methods offers perform and instruments for debugging desktop courses. This e-book proposes new robust methods that simplify the daunting job of debugging advanced software program platforms. even supposing debugging has been addressed in several learn papers, a lot of its tools haven't begun to be explored in a book-length structure. This ebook is helping to fill this hole by means of proposing an summary of latest debugging instruments with motivating examples and case stories, in addition to featuring new, state of the art debugging equipment.
Advanced Debugging Methods should be of use to software program builders trying to find instruments to be utilized in innovative perform; method architects taking a look at the connection among software program layout and debugging; instruments and programming language researchers trying to find new principles in run-time device implementation in addition to targeted descriptions of complicated implementations; and collage professors and graduate scholars who will use this publication as supplementary interpreting for graduate classes in programming instruments, language implementation, and complex object-oriented structures. Advanced Debugging Methods can be a convenient reference of at present present debugging methodologies in addition to a springboard for state of the art examine to simplify the tricky activity of debugging and to facilitate the improvement of extra powerful software program systems.
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Extra resources for Advanced Debugging Methods
A static query-based debugger (SQBD) finds all object tuples satisfying a given boolean constraint expression. For example, the query BinaryExpression* el, e2. = e2 would find the objects involved in the above javac error. The breakpoints would then carry the condition that the above query return a nonempty result. Unfortunately, even well-optimized SQBD executions would be inefficient for this task. With hundreds or thousands of BinaryExpression objects, each query becomes quite expensive to evaluate, and since the query is reevaluated every time a conditional breakpoint is reached, the program being debugged may slow down by several orders of magnitude.
IpcIaU Morpil Gewral sellUIp tulofobJ«lSlndass: ,. rn1e Object LIsIs """ .. • a*U JnCfrpI'l'Ca' (;OIIC)th: ~ f i eJ d . l1 ' Figure 6. 4). The code generator module then generates Self source code for the query-specific constraint-checking methods and integrates it with prefabricated constraint evaluation code. In the last phase, the execution module sets up the runtime environment for the query evaluation, runs the query code, and finally sends the result back to the user. The query evaluation process is summarized in the Figure 9 and Figure 10 pseudo-code.
9 seconds. 36 The dynamic query implementation uses a different join ordering heuristic. 1). 6 Hash Joins Many query constraints have the form a = ~, where a and ~ are expressions involving two different domains. In such cases, the system can compute the corresponding join using a hash-join method instead of using a less efficient nested-loop method . Consider the following query about Cecil structures: cecil_named_object ni cecil_top_context t i cecil_object_binding o. (n defining_context = t) && (t varBindings includes: 0) && (0 value = n) In this Cecil query, we can use a hash join to evaluate the =t) constraint.