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From the original patch/idea from Tobias Rittweiler this introduces more information of primary interest to ABCL implemnters such as when a form like (make-thread #'(lambda ())) is evaluated All users of EXT:BACKTRACE-AS-LIST should now use SYS:BACKTRACE, the results of which is a list of the new builtin classes JAVA_STACK_FRAME or LISP_STACK_FRAME. The methods SYS:FRAME-TO-STRING and SYS:FRAME-TO-LIST are defined to break these new objects into inspectable parts. As a convenience, there is a SYS:BACKTRACE-AS-LIST which calls SYS:FRAME-TO-LIST to each element of the computed backtrace. Refactorings have occurred on the Java side: the misnamed LispThread.backtrace() is now LispThread.printBacktrace(). LispThread.backtraceAsList() is now LispThread.backtrace() as it is a shorter name, and more to the point. Java stack frames only appear after a call through Lisp.error(), which has only the top level as a restart as an option.
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