The Racket repository
3eef017911
For GC purposes, if a "prefix" (a closure frame that caprues top-level or module-level bindings) may refer to syntax objects that are not used by any reachable closure, in which case the syntax object can be dropped. This pruning of syntax objects uses the infrastructure already in place to prune variables. Syntax objects were not included in the original pruning implementation, because they are unlikely to create finalization cycles in the way that global-variable references can. A syntax object can retain a namespace's table of module imports, however, which can be substantial and worth releasing of a closure is only held, say, for a low-level finalization action. |
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| README.txt | ||
This is the source code for the main Racket distribution. See "INSTALL.txt" for information on building Racket. License ------- Racket Copyright (c) 2010-2014 PLT Design Inc. Racket is distributed under the GNU Lesser General Public License (LGPL). This implies that you may link Racket into proprietary applications, provided you follow the rules stated in the LGPL. You can also modify Racket; if you distribute a modified version, you must distribute it under the terms of the LGPL, which in particular states that you must release the source code for the modified software. See racket/src/COPYING_LESSER.txt for more information.