Re: [BLACKBOX] Pause or single-step a program

From: Douglas G. Danforth <"Douglas>
Date: Fri, 2 Sep 2011 14:56:15 -0700

----boundary-LibPST-iamunique-871902483_-_- Content-type: text/plain Stephen, I don't have a definitive answer (yet) but here is what the BlackBox documentation says about debugging (From Dev/Docu/User-Man) ASSERT(x, n) --- You can use trap codes 0..19 freely in your programs, typically as temporary breakpoints during debugging. By convention, the other trap codes are generated by various assertions, i.e., statements which check a certain condition, and terminate the command if the condition is violated. Conditions which must be fulfilled upon entry of a procedure are called preconditions, conditions which must be fulfilled upon exit of a procedure are called postconditions, and conditions which must be fulfilled in between are called invariants. Most procedures in the BlackBox Component Framework check some preconditions. Typically, trap numbers are kept unique inside of a procedure. Thus, if a trap occurs, consult the documentation (or source, if available) of the trapped procedure. There you should get more information about the cause of the trap. The developer may even provide a plain-text description of the trap's cause, by providing suitable resources in the subsystem's string resource file: module name without subsystem prefix, followed by ".", followed by the procedure name, followed by ".", followed by the trap number. The following are examples: Math.Power.23 Pre: x # 1.0 OR ABS(y) # INF Views.View.CopyFrom.20 Views.CopyFrom and Views.CopyFromModelView must not both be overwritten If such a resource exists, the corresponding text is shown in the trap display. It should be noted that at no time during debugging the normal BlackBox Component Builder environment is left, there is no special "debugging mode" or "debugging environment"; everything is integrated instead! Example: ObxTrap docu The BlackBox debugger is a cross between a "post-mortem" debugger and a "run-time" debugger. It is invoked after a command has trapped (post-mortem), but it doesn't cause a termination of the BlackBox environment (run-time). Some features, such as the Info->View State command, which makes it possible to follow data structures starting from a selected view, are usually associated with run-time debuggers only. It is typical for object-oriented programs that their control flows can become extremely convoluted and hard to follow. Thus following a program statement for statement (single step), by message sends, or by procedure calls in practice turns out to be unpractical for debugging large systems. Instead, BlackBox uses a more effective debugging strategy: Let errors become manifest as soon as possible. Instead of waiting for some error to occur, and then trying to find one's way backward to the cause of the error, it was attempted to flag errors as closely to their cause as possible. This is the only way to truly save debugging time. The language implementation follows the same strategy, by checking index overflows when accessing arrays, by checking NIL accesses when dereferencing a pointer, etc. In addition to these built-in checks, Component Pascal provides the standard procedure ASSERT, which allows to test for an arbitrary condition. If the condition is violated, a trap window is opened. Procedures of the BlackBox Component Framework consequently use assertions e.g. at the beginning of a procedure to check whether its input is valid. This prevents that a procedure with illegal input may perform any damage to the rest of the system. This defensive programming strategy has proven itself again and again during the development of BlackBox, and is strongly recommended for serious development work. On 9/2/2011 2:19 PM, Stephen R. Troy wrote: Dear List, I need to debug a program. I want to be able to pause normal execution so I can examine the values of certain variables, then resume execution. I can see an obvious way to do it, by calling a procedure that will execute a loop until the value of a global Boolean variable changes. But since this requirement must have come up before, I hoped somebody could suggest a more elegant method. Thanks for any suggestions. Steve Troy ---- To unsubscribe, send a message with body "SIGNOFF BLACKBOX" to LISTSERV{([at]})nowhere.xy ---- To unsubscribe, send a message with body "SIGNOFF BLACKBOX" to LISTSERV{([at]})nowhere.xy ----boundary-LibPST-iamunique-871902483_-_- Content-type: application/rtf Content-transfer-encoding: base64 Content-Disposition: attachment; filename="rtf-body.rtf" e1xydGYxXGFuc2lcYW5zaWNwZzEyNTJcZnJvbWh0bWwxIFxkZWZmMHtcZm9udHRibA0Ke1xmMFxm c3dpc3NcZmNoYXJzZXQwIEFyaWFsO30NCntcZjFcZm1vZGVybiBDb3VyaWVyIE5ldzt9DQp7XGYy XGZuaWxcZmNoYXJzZXQyIFN5bWJvbDt9DQp7XGYzXGZtb2Rlcm5cZmNoYXJzZXQwIENvdXJpZXIg TmV3O319DQp7XGNvbG9ydGJsXHJlZDBcZ3JlZW4wXGJsdWUwO1xyZWQwXGdyZWVuMFxibHVlMjU1 O30NClx1YzFccGFyZFxwbGFpblxkZWZ0YWIzNjAgXGYwXGZzMjQgDQp7XCpcaHRtbHRhZzE5IDxo dG1sPn0NCntcKlxodG1sdGFnMiBccGFyIH0NCntcKlxodG1sdGFnMjQyICAgfQ0Ke1wqXGh0bWx0 YWczNCA8aGVhZD59DQp7XCpcaHRtbHRhZzEgXHBhciB9DQp7XCpcaHRtbHRhZzI0MSAgICAgfQ0K e1wqXGh0bWx0YWcxIFxwYXIgfQ0Ke1wqXGh0bWx0YWcyNDEgICB9DQp7XCpcaHRtbHRhZzQxIDwv 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