104 lines
2.7 KiB
Scheme
104 lines
2.7 KiB
Scheme
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; Copyright (c) 1994 by Richard Kelsey. See file COPYING.
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(define *break-on-user-errors?* #f)
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(define (user-error node string . args)
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(format #t "~%PreScheme error: ")
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(apply format #t string args)
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(newline)
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(if node (display-source node))
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(if *break-on-user-errors?*
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(breakpoint "")))
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(define (display-source node)
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(let ((source-node (find-some-source node)))
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(if source-node
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(display-annotation (node-source source-node)
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(eq? source-node node)
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node)
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(pp-cps (top-call node)))))
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(define (top-call node)
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(let loop ((node node))
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(if (or (not (node? (node-parent node)))
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(and (call-node? node)
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(not (call-node? (node-parent node)))))
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node
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(loop (node-parent node)))))
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(define (node-source node)
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(cond ((call-node? node)
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(call-source node))
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((lambda-node? node)
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(lambda-source node))
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(else
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#f)))
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(define (find-some-source node)
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(let loop ((node node))
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(cond ((not (node? node))
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#f)
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((annotation? (node-source node))
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node)
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(else (loop (node-parent node))))))
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(define (display-annotation annotation exact? node)
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(let ((file (annotation-file annotation))
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(form (annotation-form annotation))
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(row (annotation-row annotation))
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(column (annotation-column annotation)))
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(newline)
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(cond (exact?
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(display " "))
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(else
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(write-one-line (current-output-port)
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60
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(lambda (port)
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(show-user-node node port)))
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(display " within ")))
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(newline)
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(write-one-line (current-output-port)
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70
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(lambda (port) (display form port)))
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(format #t "~% on line ~D of ~A~%" column file)))
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(define (show-user-node node port)
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(cond ((literal-node? node)
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(format port "'~S" (literal-value node)))
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((reference-node? node)
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(format port "~S" (variable-name (reference-variable node))))
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((lambda-node? node)
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(format port "(lambda ~A ...)"
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(map variable-name
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(if (proc-lambda? node)
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(cdr (lambda-variables node))
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(lambda-variables node))))
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(show-user-node (lambda-body node) port))
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((call-node? node)
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(show-user-call-node node port))))
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(define (show-user-call-node call port)
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(let ((exits (call-exits call))
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(id (primop-id (call-primop call))))
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(case id
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((let)
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(display "(let ..." port) ; wimpy
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)
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((call unknown-call)
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(display "(" port)
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(show-user-node (call-arg call 1) port)
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(show-user-call-args call (if (eq? 'call id) 2 3) port)
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(display ")" port))
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(else ; wimpy
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(format port "(~S" id)
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(show-user-call-args call exits port)
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(format port ")")))))
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(define (show-user-call-args call start port)
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(do ((i start (+ i 1)))
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((>= i (call-arg-count call)))
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(display " " port)
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(show-user-node (call-arg call i) port)))
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