Christopher Baines
b3fa4d069b
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Try and improve the print-backtrace-and-exception/knots output, be selective about the stack frames which are shown to try and produce some useful output which reflects user code and hide the &knots-exceptions. This commit also introduces a bunch of tests scripts that produce output from print-backtrace-and-exception/knots, to help test this code in different situations.
40 lines
1.1 KiB
Scheme
40 lines
1.1 KiB
Scheme
(use-modules (knots) (fibers) (knots parallelism))
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;; Deep call chain within the innermost fiber. Each function calls the next
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;; via `begin', placing the call in non-tail position so Guile's TCO does not
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;; collapse the frames; all four frames survive and appear in the backtrace.
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(define (deeply-nested x)
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(error "deeply nested error" x)) ; LAST BACKTRACE ENTRY HERE
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(define (three-deep x)
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(fibers-map deeply-nested (list x)))
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(define (two-deep x)
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(fibers-map three-deep (list x)))
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(define (one-deep x)
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(fibers-map two-deep (list x)))
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;; process-batch runs inside one fiber and dispatches the deep call chain into
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;; a nested fiber via a second fibers-map, creating two fiber boundaries.
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(define (process-batch items)
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(begin
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(fibers-map one-deep (list items))
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'unreachable))
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(define (run-work)
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(begin
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(fibers-map process-batch '(1))
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'unreachable))
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(define result
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(run-fibers
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(lambda ()
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;; FIRST BACKTRACE ENTRY: 1762:12 (with-exception-handler
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(with-exception-handler
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(lambda (e)
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(print-backtrace-and-exception/knots e)
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(primitive-exit 1))
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run-work))
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#:hz 0 #:parallelism 1))
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