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| 1 | ================================================================= |
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| 2 | Logtalk - Object oriented extension to Prolog |
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| 3 | Release 2.9.0 |
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| 4 | |
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| 5 | Copyright (c) 1998-2001 Paulo Moura. All Rights Reserved. |
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| 6 | ================================================================= |
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| 7 | |
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| 8 | |
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| 9 | To load all objects in this group consult the debugging.loader utility |
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| 10 | file. |
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| 11 | |
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| 12 | You will need to load FIRST the events.loader file otherwise you will get |
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| 13 | a runtime error. |
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| 14 | |
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| 15 | |
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| 16 | The object debugger enables you to: |
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| 17 | |
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| 18 | - spy all or specific messages to an object |
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| 19 | - trace an execution |
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| 20 | - specify the streams used for debugger input/output |
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| 21 | |
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| 22 | These capabilities rely on the use of the event-based programming built in |
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| 23 | Logtalk. That means that you can only debug public messages sent using the |
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| 24 | ::/2 operator. |
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| 25 | |
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| 26 | You can have any number of debuggers active simultaneously, possibly |
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| 27 | assigning different input/output streams to each one. |
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| 28 | |
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| 29 | Input/output is one area where Prologs compilers can differ, sometimes |
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| 30 | because of differences in the underlying operating system. Therefore, |
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| 31 | it is advisable that you look at the code of class debugger before |
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| 32 | trying to use it. The i/o operations are done by the methods output/3, |
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| 33 | query_user/1 and execute_option/1. |
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