sbcl 注意“无法堆栈分配”

编程问答 2022-05-30

问题描述

为什么 sbcl (2.0.11) 给出这些编译器注释？这是否意味着这不是一种有效的方法？有什么你可以做的事情来堆栈分配谓词和键吗？或者另一种方法更好？

(defun sort-on-car (x)
  (sort x #'> :key #'car))

; in: DEFUN SORT-ON-CAR
;     (SORT PLAGE::X #'> :KEY #'CAR)
; 
; note: Could not stack allocate SB-IMPL::PREDICATE-FUN in: (SORT X #'> :KEY #'CAR)
; 
; note: Could not stack allocate SB-IMPL::KEY in: (SORT X #'> :KEY #'CAR)
; 
; note: Could not stack allocate SB-IMPL::PREDICATE-FUN in: (SORT X #'> :KEY #'CAR)
; 
; note: Could not stack allocate SB-IMPL::KEY in: (SORT X #'> :KEY #'CAR)
; 
; compilation unit finished
;   printed 4 notes

最小可重复示例，应要求提供。该文件仅包含上面的函数定义。

$ /usr/bin/sbcl --no-sysinit --no-userinit
This is SBCL 2.0.11,an implementation of ANSI Common Lisp.
More information about SBCL is available at <http://www.sbcl.org/>.

SBCL is free software,provided as is,with absolutely no warranty.
It is mostly in the public domain; some portions are provided under
BSD-style licenses.  See the CREDITS and copYING files in the
distribution for more information.
* (compile-file "/tmp/sortwarning.lisp")
; compiling file "/tmp/sortwarning.lisp" (written 13 JAN 2021 09:50:06 AM):
; processing (DEFUN SORT-ON-CAR ...)
; file: /tmp/sortwarning.lisp
; in: DEFUN SORT-ON-CAR
;     (SORT X #'> :KEY #'CAR)
; 
; note: Could not stack allocate SB-IMPL::PREDICATE-FUN in: (SORT X #'> :KEY #'CAR)
; 
; note: Could not stack allocate SB-IMPL::KEY in: (SORT X #'> :KEY #'CAR)
; 
; note: Could not stack allocate SB-IMPL::PREDICATE-FUN in: (SORT X #'> :KEY #'CAR)
; 
; note: Could not stack allocate SB-IMPL::KEY in: (SORT X #'> :KEY #'CAR)
; 
; compilation unit finished
;   printed 4 notes


; wrote /tmp/sortwarning.fasl
; compilation finished in 0:00:00.050
#P"/tmp/sortwarning.fasl"
NIL
NIL
*

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common-lispsbclsortingstack