64 lines
2.0 KiB
Scheme
64 lines
2.0 KiB
Scheme
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; Copyright (c) 1993-1999 by Richard Kelsey and Jonathan Rees. See file COPYING.
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; The symbol table, which is just a string table full of symbols.
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(define *the-symbol-table*)
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(define-consing-primitive intern (string->)
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(lambda (ignore)
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(+ vm-symbol-size
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hash-table-entry-size))
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(let ((searcher (table-searcher vm-symbol->string
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vm-symbol-next
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vm-make-symbol)))
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(lambda (string key)
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(searcher *the-symbol-table* string key)))
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return)
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; Using the regular set-...-next! procedures in the cleanup procedure is
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; unfortunate, because they go through the write barrier. Of course, we
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; could disable that for these setters, since the symbol table has to be
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; checked every GC anyway.
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; Copy the table and remove any unreachable symbols. This is exported for
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; use when writing an image.
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(define s48-copy-symbol-table
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(let ((cleaner! (table-cleaner vm-symbol-next vm-set-symbol-next!)))
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(lambda ()
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(let ((new (s48-trace-value *the-symbol-table*)))
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(cleaner! new)
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new))))
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(add-post-gc-cleanup!
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(lambda ()
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(set! *the-symbol-table* (s48-copy-symbol-table))))
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; There is no symbol table in images created by the static linker.
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(define (install-symbols!+gc symbol-table)
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(if (eq? symbol-table false)
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(build-symbol-table+gc)
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(set! *the-symbol-table* symbol-table)))
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; Create the symbol table and then add to it all currently-extant symbols.
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(define (build-symbol-table+gc)
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(set! *the-symbol-table* (make-hash-table (ensure-space hash-table-size)))
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(let ((symbols (let ((maybe (s48-find-all (enum stob symbol))))
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(if (eq? maybe false)
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(begin
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(collect)
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(let ((maybe (s48-find-all (enum stob symbol))))
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(if (eq? maybe false)
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(error "insufficient heap space to build symbol table"))
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maybe))
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maybe))))
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(natural-for-each (lambda (i)
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(symbol-table-add! *the-symbol-table*
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(vm-vector-ref symbols i)))
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(vm-vector-length symbols))))
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(define symbol-table-add! (table-adder vm-symbol->string vm-set-symbol-next!))
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