b78838a641
In safe compilation modes, avoid turning an error like (let ([x (values 1 2)]) x) or (car (list (values 1 2))) into a program that returns multiple values or (if (list (values 1 2)) 3 4) into a program that returns without an error. In addition, refrain from moving an expression from a non-tail position within a procedure to a tail position, unless the expression is not only single valued but also gauarnteed not to inspect the immediate continuation (e.g., using `call/cc` and comparing the result to a previously captured continuation). This constraint applies even in unsafe compilation modes, because the intent it to provide some guarantees about non-tail positions to complement existing guarantees of tail positions. original commit: 91e9631576e7b97137be856e985609320e327f32
36 lines
1.2 KiB
Scheme
36 lines
1.2 KiB
Scheme
;;; patch.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 ($value x) x)
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(printf "loading ~s cross compiler~%" (constant machine-type-name))
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; (current-expand (lambda args (apply sc-expand args)))
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; (current-eval (lambda args (apply interpret args)))
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(when-feature pthreads
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(meta-cond
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[(not (threaded?))
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; we must be cross-compiling from nonthreaded to threaded version
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; handle thread parameter creation
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(define-syntax with-mutex
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(syntax-rules ()
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[(_ mexp e0 e1 ...) (begin e0 e1 ...)]))
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(set! make-thread-parameter make-parameter)
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(set! mutex-acquire (lambda (m) (void)))
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(set! mutex-release (lambda (m) (void)))
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(set! $tc-mutex (void))]))
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