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40 lines
1.4 KiB
Common Lisp
40 lines
1.4 KiB
Common Lisp
;;;; -*- Mode: Lisp; Syntax: Common-Lisp; indent-tabs-mode: nil; Package: C -*-
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;;;; vim: set filetype=lisp tabstop=8 shiftwidth=2 expandtab:
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;;;;
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;;;; Copyright (c) 2010, Juan Jose Garcia-Ripoll.
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;;;;
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;;;; This program is free software; you can redistribute it and/or
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;;;; modify it under the terms of the GNU Library General Public
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;;;; License as published by the Free Software Foundation; either
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;;;; version 2 of the License, or (at your option) any later version.
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;;;;
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;;;; See file '../Copyright' for full details.
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;;;;
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;;;; CMPOPT-CONSTANTS Constant expressions.
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;;;;
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(in-package "COMPILER")
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(defun constant-expression-p (form &optional (env *cmp-env*))
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(or (constantp form env)
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(and (consp form)
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(let ((head (car form)))
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(or (member head '(IF OR AND NULL NOT PROGN))
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(and (get-sysprop head 'pure)
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(inline-possible head))))
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(loop for c in (rest form)
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always (constant-expression-p c env)))))
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(defun extract-constant-value (form &optional failure (env *cmp-env*))
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(if (constant-expression-p form env)
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(handler-case (cmp-eval form env)
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(error (c) failure))
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failure))
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(defun constant-value-p (form &optional (env *cmp-env*))
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(if (constant-expression-p form env)
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(handler-case
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(values t (cmp-eval form env))
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(error (c) (values nil form)))
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(values nil form)))
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