f53f20b5b9
Change the GC so that it can mark and sweep objects in-place, instead of always copying. This change is helpful for reducing peak memory use while performing a collection on a large, old heap. Some non-copying support was already in place for locked objects, but the new implementation is faster and more general. As an alternative to locking, the storage manager now provides "immobile" allocation (currently only for bytevectors, vectors, and boxes), which allocates an object that won't move but that can be GCed if it's not referenced. A locked object is an object that has been immobiled and that is on a global list --- mostly the old, non-scalable implementation of locked objects brought back, since immobile objects cover the cases that need to scale. original commit: aecb7b736cb1d52764c292fa6364a674958dfde3
229 lines
8.0 KiB
Scheme
229 lines
8.0 KiB
Scheme
"back.ss"
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;;; back.ss
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;;; Copyright 1984-2017 Cisco Systems, Inc.
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;;;
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;;; Licensed under the Apache License, Version 2.0 (the "License");
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;;; you may not use this file except in compliance with the License.
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;;; You may obtain a copy of the License at
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;;;
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;;; http://www.apache.org/licenses/LICENSE-2.0
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;;;
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;;; Unless required by applicable law or agreed to in writing, software
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;;; distributed under the License is distributed on an "AS IS" BASIS,
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;;; WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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;;; See the License for the specific language governing permissions and
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;;; limitations under the License.
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(define-who trace-output-port
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($make-thread-parameter
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(console-output-port)
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(lambda (x)
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(unless (and (output-port? x) (textual-port? x))
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($oops who "~s is not a textual output port" x))
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x)))
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(define-who trace-print
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($make-thread-parameter
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pretty-print
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(lambda (x)
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(unless (procedure? x)
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($oops who "~s is not a procedure" x))
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x)))
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(define suppress-greeting (make-parameter #f (lambda (x) (and x #t))))
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(define-who eval-syntax-expanders-when
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($make-thread-parameter '(compile load eval)
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(lambda (x)
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(unless (let check ([x x] [l '(compile load eval visit revisit)])
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(or (null? x)
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(and (pair? x)
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(memq (car x) l)
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(check (cdr x) (remq (car x) l)))))
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($oops who "invalid eval-when list ~s" x))
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x)))
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(define-who collect-maximum-generation
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(let ([$get-maximum-generation (foreign-procedure "(cs)maxgen" () fixnum)]
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[$set-maximum-generation! (foreign-procedure "(cs)set_maxgen" (fixnum) void)])
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(case-lambda
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[() ($get-maximum-generation)]
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[(g)
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(unless (and (fixnum? g) (fx>= g 0)) ($oops who "invalid generation ~s" g))
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(when (fx= g 0) ($oops who "new maximum generation must be at least 1"))
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(let ([limit (fx- (constant static-generation) 1)])
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(when (fx> g limit) ($oops who "~s exceeds maximum supported value ~s" g limit)))
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($set-maximum-generation! g)])))
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(define-who release-minimum-generation
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(let ([$get-release-minimum-generation (foreign-procedure "(cs)minfreegen" () fixnum)]
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[$set-release-minimum-generation! (foreign-procedure "(cs)set_minfreegen" (fixnum) void)])
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(case-lambda
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[() ($get-release-minimum-generation)]
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[(g)
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(unless (and (fixnum? g) (fx>= g 0)) ($oops who "invalid generation ~s" g))
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(unless (fx<= g (collect-maximum-generation))
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($oops who "new release minimum generation must not be be greater than collect-maximum-generation"))
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($set-release-minimum-generation! g)])))
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(define-who in-place-minimum-generation
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(let ([$get-mark-minimum-generation (foreign-procedure "(cs)minmarkgen" () fixnum)]
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[$set-mark-minimum-generation! (foreign-procedure "(cs)set_minmarkgen" (fixnum) void)])
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(case-lambda
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[() ($get-mark-minimum-generation)]
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[(g)
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(unless (and (fixnum? g) (fx>= g 0)) ($oops who "invalid generation ~s" g))
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(let ([limit (fx- (constant static-generation) 1)])
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(when (fx> g limit) ($oops who "~s exceeds maximum supported value ~s" g limit)))
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($set-mark-minimum-generation! g)])))
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(define-who enable-object-counts
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(let ([$get-enable-object-counts (foreign-procedure "(cs)enable_object_counts" () boolean)]
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[$set-enable-object-counts (foreign-procedure "(cs)set_enable_object_counts" (boolean) void)])
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(case-lambda
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[() ($get-enable-object-counts)]
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[(b) ($set-enable-object-counts b)])))
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(define-who enable-object-backreferences
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(let ([$get-enable-object-backreferences (foreign-procedure "(cs)enable_object_backreferences" () boolean)]
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[$set-enable-object-backreferences (foreign-procedure "(cs)set_enable_object_backreferences" (boolean) void)])
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(case-lambda
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[() ($get-enable-object-backreferences)]
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[(b) ($set-enable-object-backreferences b)])))
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(define-who collect-trip-bytes
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(make-parameter
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(constant default-collect-trip-bytes)
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(lambda (x)
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(unless (and (fixnum? x) (fx< 0 x))
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($oops who "~s is not a positive fixnum" x))
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($set-collect-trip-bytes x)
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x)))
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(define-who heap-reserve-ratio
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(case-lambda
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[() $heap-reserve-ratio]
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[(x) (unless (number? x)
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($oops who "~s is not a number" x))
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(let ([y (inexact x)])
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(unless (and (flonum? y) (>= y 0))
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($oops who "invalid heap reserve ratio ~s" x))
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(set! $heap-reserve-ratio y))]))
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(define-who $assembly-output
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($make-thread-parameter #f
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(lambda (x)
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(cond
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[(or (not x) (and (output-port? x) (textual-port? x))) x]
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[(eq? x #t) (current-output-port)]
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[else ($oops who "~s is not a textual output port or #f" x)]))))
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(define-who expand-output
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($make-thread-parameter #f
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(lambda (x)
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(unless (or (not x) (and (output-port? x) (textual-port? x)))
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($oops who "~s is not a textual output port or #f" x))
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x)))
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(define-who expand/optimize-output
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($make-thread-parameter #f
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(lambda (x)
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(unless (or (not x) (and (output-port? x) (textual-port? x)))
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($oops who "~s is not a textual output port or #f" x))
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x)))
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(define generate-wpo-files
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($make-thread-parameter #f
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(lambda (x)
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(and x #t))))
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(define-who generate-covin-files
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($make-thread-parameter #f
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(lambda (x)
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(and x #t))))
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(define $enable-check-prelex-flags
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($make-thread-parameter #f
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(lambda (x)
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(and x #t))))
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(define-who run-cp0
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($make-thread-parameter
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(default-run-cp0)
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(lambda (x)
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(unless (procedure? x)
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($oops who "~s is not a procedure" x))
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x)))
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(define compile-compressed
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($make-thread-parameter #t (lambda (x) (and x #t))))
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(define compile-file-message
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($make-thread-parameter #t (lambda (x) (and x #t))))
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(define compile-imported-libraries
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($make-thread-parameter #f (lambda (x) (and x #t))))
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(define-who compile-library-handler
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($make-thread-parameter
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(lambda (ifn ofn) (compile-library ifn ofn))
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(lambda (x)
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(unless (procedure? x) ($oops who "~s is not a procedure" x))
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x)))
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(define-who compile-program-handler
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($make-thread-parameter
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(lambda (ifn ofn) (compile-program ifn ofn))
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(lambda (x)
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(unless (procedure? x) ($oops who "~s is not a procedure" x))
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x)))
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(define-who compress-format
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(case-lambda
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[()
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(let ([x ($tc-field 'compress-format ($tc))])
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(cond
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[(eqv? x (constant COMPRESS-GZIP)) 'gzip]
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[(eqv? x (constant COMPRESS-LZ4)) 'lz4]
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[else ($oops who "unexpected $compress-format value ~s" x)]))]
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[(x)
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($tc-field 'compress-format ($tc)
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(case x
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[(gzip) (constant COMPRESS-GZIP)]
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[(lz4) (constant COMPRESS-LZ4)]
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[else ($oops who "~s is not a supported format" x)]))]))
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(define-who compress-level
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(case-lambda
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[()
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(let ([x ($tc-field 'compress-level ($tc))])
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(cond
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[(eqv? x (constant COMPRESS-MIN)) 'minimum]
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[(eqv? x (constant COMPRESS-LOW)) 'low]
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[(eqv? x (constant COMPRESS-MEDIUM)) 'medium]
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[(eqv? x (constant COMPRESS-HIGH)) 'high]
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[(eqv? x (constant COMPRESS-MAX)) 'maximum]
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[else ($oops who "unexpected $compress-level value ~s" x)]))]
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[(x)
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($tc-field 'compress-level ($tc)
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(case x
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[(minimum) (constant COMPRESS-MIN)]
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[(low) (constant COMPRESS-LOW)]
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[(medium) (constant COMPRESS-MEDIUM)]
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[(high) (constant COMPRESS-HIGH)]
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[(maximum) (constant COMPRESS-MAX)]
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[else ($oops who "~s is not a supported level" x)]))]))
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(define-who debug-level
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($make-thread-parameter
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1
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(lambda (x)
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(unless (and (fixnum? x) (<= 0 x 3))
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($oops who "invalid level ~s" x))
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x)))
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(define internal-defines-as-letrec*
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($make-thread-parameter #t (lambda (x) (and x #t))))
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(set! $scheme-version (string->symbol ($format-scheme-version (constant scheme-version))))
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