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helpers.lisp
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;;; -*- Syntax: Common-Lisp; Base: 10 -*-
;;;
;;; Copyright (c) 2024 Gary Palter
;;;
;;; Licensed under the MIT License;
;;; you may not use this file except in compliance with the License.
;;; You may obtain a copy of the License at
;;;
;;; https://opensource.org/license/mit
(in-package #:forth)
;;; Fast integer printing
(define-constant +digits+ "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ")
(defconstant +max-width+ 130)
(defun write-integer (value base)
(declare (type integer value) (fixnum base)
(optimize (speed 3) (safety 0)))
(let ((text (make-string +max-width+ :element-type 'base-char))
(start (1- +max-width+))
(negative? (minusp value))
(rem 0))
(declare (fixnum start rem)
(dynamic-extent text))
(when negative?
(setf value (- value)))
(if (fixnump value)
(locally (declare (fixnum value))
(loop
(multiple-value-setq (value rem) (truncate value base))
(setf (schar text start) (schar +digits+ rem))
(when (zerop value)
(return))
(setf start (the fixnum (1- start)))))
(loop
(multiple-value-setq (value rem) (truncate value base))
(setf (schar text start) (schar +digits+ rem))
(when (zerop value)
(return))
(setf start (the fixnum (1- start)))))
(when negative?
(setf start (the fixnum (1- start)))
(setf (schar text start) #\-))
(write-string text *standard-output* :start start :end +max-width+)
(write-char #\Space)
nil))
;;; Functions used as the code for some of the words defined by Forth 2012
(defun push-parameter-as-cell (fs parameters)
(declare (type forth-system fs) (type parameters parameters)
(optimize (speed 3) (safety 0)))
(with-forth-system (fs)
(stack-push data-stack (parameters-p1 parameters))))
(defun push-parameter-as-double-cell (fs parameters)
(declare (type forth-system fs) (type parameters parameters)
(optimize (speed 3) (safety 0)))
(with-forth-system (fs)
(stack-push-double data-stack (parameters-p1 parameters))))
(defun push-value (fs parameters)
(declare (type forth-system fs) (type parameters parameters)
(optimize (speed 3) (safety 0)))
(with-forth-system (fs)
(let ((address (parameters-p1 parameters))
(type (parameters-p2 parameters)))
(case type
(:value
(stack-push data-stack (memory-cell memory address)))
(:2value
(stack-push-double data-stack (memory-double-cell memory address)))
(:fvalue
(stack-push float-stack (memory-native-float memory address)))))))
(defun push-parameter-as-float (fs parameters)
(declare (type forth-system fs) (type parameters parameters)
(optimize (speed 3) (safety 0)))
(with-forth-system (fs)
(stack-push float-stack (parameters-p1 parameters))))
(defun execute-parameter (fs parameters)
(declare (type forth-system fs) (type parameters parameters)
(optimize (speed 3) (safety 0)))
(with-forth-system (fs)
(when (null (parameters-p1 parameters))
(forth-exception :defer-not-set))
(execute execution-tokens (parameters-p1 parameters) fs)))
(defun do-marker (fs parameters)
(declare (type forth-system fs) (type parameters parameters)
(optimize (speed 3) (safety 0)))
(with-forth-system (fs)
(execute-marker word-lists execution-tokens files (parameters-p1 parameters))))
(defun replace-top-of-search-order-with-parameter (fs parameters)
(declare (type forth-system fs) (type parameters parameters)
(optimize (speed 3) (safety 0)))
(with-forth-system (fs)
(replace-top-of-search-order word-lists (parameters-p1 parameters))))
;;; Structure (BEGIN-STRUCTURE) helpers
(defstruct (forth-structure (:conc-name #:fs-))
(size 0)
(word nil)
(named? nil)
(fields nil))
(defun add-structure-field (fs name field-size &optional (align? t))
(with-forth-system (fs)
(let* ((original-offset (stack-pop data-stack))
(offset (cond ((zerop (mod original-offset (max field-size 1)))
original-offset)
(align?
(+ original-offset (- field-size (mod original-offset field-size))))
(t
original-offset)))
(struct (stack-cell data-stack 0))
(name (if (fs-named? struct)
(format nil "~A.~A" (word-name (fs-word struct)) name)
name))
(word (make-word name #'push-field-address-from-parameter :smudge? t :parameters (make-parameters offset))))
(push word (fs-fields struct))
(add-and-register-word fs word)
(stack-push data-stack (+ offset field-size)))))
(defun push-structure-size-from-parameter (fs parameters)
(declare (type forth-system fs) (type parameters parameters)
(optimize (speed 3) (safety 0)))
(with-forth-system (fs)
(stack-push data-stack (fs-size (parameters-p1 parameters)))))
(defun push-field-address-from-parameter (fs parameters)
(declare (type forth-system fs) (type parameters parameters)
(optimize (speed 3) (safety 0)))
(with-forth-system (fs)
(stack-push data-stack (+ (stack-pop data-stack) (parameters-p1 parameters)))))
;;; Helpers for FFI words
(defun push-parameter-as-global-pointer (fs parameters)
(declare (type forth-system fs) (type parameters parameters)
(optimize (speed 3) (safety 0)))
(with-forth-system (fs)
(let* ((name (parameters-p1 parameters))
(forth-name (parameters-p2 parameters))
(library (library-ffi-library (parameters-p3 parameters)))
(pointer (cffi:foreign-symbol-pointer name :library library)))
(if (null pointer)
(forth-exception :undefined-foreign-global "Foreign global ~A~@[ (AS ~A)~] is not defined~@[ ~A~]"
name forth-name #+LispWorks (library-name (ffi-current-library ffi)) #-LispWorks nil)
(stack-push data-stack (native-address memory pointer))))))
(defun push-parameter-as-callback-ptr (fs parameters)
(declare (type forth-system fs) (type parameters parameters)
(optimize (speed 3) (safety 0)))
(with-forth-system (fs)
(stack-push data-stack (native-address memory (cffi:get-callback (parameters-p1 parameters))))))