/usr/share/common-lisp/source/regex/gen.lisp is in cl-regex 1-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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(in-package :REGEX)
;;;
;;; Pass 5 - Generate list of CPS instructions
;;;
; Generate a flattened list of instructions, with continuation
; targets, and (init) and (success) in the proper places...
(defun gen-instr-list (tree)
(let* ((*instrs*)
(*next-instr* 0))
(declare (special *instrs* *next-instr*))
(let* ((success-instr (alloc-instr))
(start-instr (emit-instr tree success-instr)))
(add-instr success-instr '(success t))
(values start-instr
(sort *instrs* #'< :key #'first)))))
(defun add-instr (statenum instr)
(declare (special *instrs*))
(push (cons statenum instr) *instrs*)
statenum)
(defun alloc-instr ()
(declare (special *next-instr*))
(let ((instr *next-instr*))
(incf *next-instr*)
instr))
; similar to old compile-state-machine
(defun emit-instr (node next)
(cond
((null node) next)
((eq (first node) 'char)
(add-instr (alloc-instr) `(char ,(second node) ,next)))
((eq (first node) 'string)
(add-instr (alloc-instr) `(string ,(second node) ,next)))
((classseq-node-p node)
(add-instr (alloc-instr) `(classseq ,(classseq-node-seq node) ,next)))
((backmatch-node-p node)
(add-instr (alloc-instr) `(backmatch ,(backmatch-node-regnum node) ,next)))
((seq-node-p node)
(emit-sequence (seq-node-children node) next))
;; kleene-nodes have been optimized to specialized instructions
((eq (first node) 'str-greedy-kleene)
(add-instr (alloc-instr)
`(str-greedy-kleene ,(second node) ,next)))
((eq (first node) 'char-greedy-kleene)
(add-instr (alloc-instr)
`(char-greedy-kleene ,(second node) ,next)))
((eq (first node) 'not-char-greedy-kleene)
(add-instr (alloc-instr)
`(not-char-greedy-kleene ,(second node) ,next)))
((eq (first node) 'cclass-2-greedy-kleene)
(add-instr (alloc-instr)
`(cclass-2-greedy-kleene ,(second node) ,(third node) ,next)))
((eq (first node) 'not-cclass-2-greedy-kleene)
(add-instr (alloc-instr)
`(not-cclass-2-greedy-kleene ,(second node) ,(third node) ,next)))
((eq (first node) 'cclass-greedy-kleene)
(add-instr (alloc-instr) `(cclass-greedy-kleene ,(second node) ,next)))
((eq (first node) 'not-cclass-greedy-kleene)
(add-instr (alloc-instr) `(not-cclass-greedy-kleene ,(second node) ,next)))
((eq (first node) 'specclass-greedy-kleene)
(add-instr (alloc-instr) `(specclass-greedy-kleene ,(second node) ,next)))
((eq (first node) 'not-specclass-greedy-kleene)
(add-instr (alloc-instr) `(not-specclass-greedy-kleene ,(second node) ,next)))
((eq (first node) 'greedy-kleene-no-termcheck)
(emit-greedy-kleene-no-termcheck (second node) next))
((eq (first node) 'greedy-kleene-simple-termcheck)
(emit-greedy-kleene-simple-termcheck (second node) next))
((eq (first node) 'greedy-kleene-full-termcheck)
(emit-greedy-kleene-full-termcheck (second node) next))
((eq (first node) 'ngkleene-no-termcheck)
(emit-ngkleene-no-termcheck (second node) next))
((eq (first node) 'ngkleene-simple-termcheck)
(emit-ngkleene-simple-termcheck (second node) next))
((eq (first node) 'ngkleene-full-termcheck)
(emit-ngkleene-full-termcheck (second node) next))
;; pkleene-nodes are long since converted to opt and kleene nodes
;; optional nodes are long since converted to alt nodes
;; range-nodes are long since gone...
((alt-node-p node)
(emit-alt (alt-node-children node) next))
((casealt-node-p node)
(emit-casealt (casealt-node-children node) next))
((start-anchor-node-p node)
(add-instr (alloc-instr) `(startanchor ,next)))
((end-anchor-node-p node)
(add-instr (alloc-instr) `(endanchor ,next)))
;; register-nodes are long since gone, converted to regstart/regend
((eq (first node) 'right-rstart)
(add-instr (alloc-instr)
`(right-rstart ,(second node) ,next)))
((eq (first node) 'left-rstart)
(add-instr (alloc-instr)
`(left-rstart ,(second node) ,next)))
((regend-node-p node)
(add-instr (alloc-instr) `(rend ,(regend-node-regnum node) ,next)))
;; charclass-nodes are long since converted to specialized instr nodes
((eq (first node) 'cclass-2)
(add-instr (alloc-instr)
`(cclass-2 ,(second node) ,(third node) ,next)))
((eq (first node) 'cclass)
(add-instr (alloc-instr)
`(cclass ,(second node) ,next)))
((eq (first node) 'not-char)
(add-instr (alloc-instr)
`(not-char ,(second node) ,next)))
((eq (first node) 'not-cclass-2)
(add-instr (alloc-instr)
`(not-cclass-2 ,(second node) ,(third node) ,next)))
((eq (first node) 'not-cclass)
(add-instr (alloc-instr) `(not-cclass ,(second node) ,next)))
;; specclass-nodes are long since gone, converted to specialized instr nodes
((eq (first node) 'specclass)
(add-instr (alloc-instr) `(specclass ,(second node) ,next)))
((eq (first node) 'not-specclass)
(add-instr (alloc-instr) `(not-specclass ,(second node) ,next)))
((any-node-p node)
(add-instr (alloc-instr) `(any ,next)))
((startword-node-p node)
(add-instr (alloc-instr) `(startword ,next)))
((endword-node-p node)
(add-instr (alloc-instr) `(endword ,next)))
((lookahead-node-p node)
(emit-lookahead (second node) next))
((nlookahead-node-p node)
(emit-nlookahead (second node) next))
((hook-node-p node)
(add-instr (alloc-instr)
`(hook ,(hook-node-function node) ,next)))
((success-node-p node)
(add-instr (alloc-instr)
`(success ,(success-node-rc node) ,next)))
(t ;; once we're done, this should throw the :invalid-parse-tree tag
(throw 'regex-parse-error
(list "codegen: Unhandled intermediate node ~S" node)))))
(defun emit-sequence (children next)
(cond ((null children) next)
(t (emit-instr (first children)
(emit-sequence (rest children) next)))))
(defun emit-lookahead (child-node next)
(let* ((childsuccess-instr-num (alloc-instr))
(child-instr-num (emit-instr child-node childsuccess-instr-num)))
(add-instr childsuccess-instr-num '(success t))
(add-instr (alloc-instr)
`(lookahead ,child-instr-num ,next)) ))
(defun emit-nlookahead (child-node next)
(let* ((childsuccess-instr-num (alloc-instr))
(child-instr-num (emit-instr child-node childsuccess-instr-num)))
(add-instr childsuccess-instr-num '(success t))
(add-instr (alloc-instr)
`(nlookahead ,child-instr-num ,next)) ))
(defun emit-greedy-kleene-no-termcheck (child-node next)
(let* ((loop-instr-num (alloc-instr))
(body-instr-num (emit-instr child-node loop-instr-num)))
(add-instr loop-instr-num
`(alt-2-no-termcheck ,body-instr-num ,next))))
(defun emit-greedy-kleene-simple-termcheck (child-node next)
(let* ((loop-instr-num (alloc-instr))
(body-instr-num (emit-instr child-node loop-instr-num)))
(add-instr loop-instr-num
`(alt-2-simple-termcheck-1 ,body-instr-num ,next))))
(defun emit-greedy-kleene-full-termcheck (child-node next)
(let* ((loop-instr-num (alloc-instr))
(body-instr-num (emit-instr child-node loop-instr-num)))
(add-instr loop-instr-num
`(alt-2-full-termcheck ,body-instr-num ,next))))
(defun emit-ngkleene-no-termcheck (child-node next)
(let* ((loop-instr-num (alloc-instr))
(body-instr-num (emit-instr child-node loop-instr-num)))
(add-instr loop-instr-num
`(alt-2-no-termcheck ,next ,body-instr-num))))
(defun emit-ngkleene-simple-termcheck (child-node next)
(let* ((loop-instr-num (alloc-instr))
(body-instr-num (emit-instr child-node loop-instr-num)))
(add-instr loop-instr-num
`(alt-2-simple-termcheck-2 ,next ,body-instr-num))))
(defun emit-ngkleene-full-termcheck (child-node next)
(let* ((loop-instr-num (alloc-instr))
(body-instr-num (emit-instr child-node loop-instr-num)))
(add-instr loop-instr-num
`(alt-2-full-termcheck ,next ,body-instr-num))))
(defun emit-alt (child-nodes next)
(let* ((alt-instr-num (alloc-instr))
(child-instr-nums (mapcar (lambda (child-node)
(emit-instr child-node next))
child-nodes))
(num-children (length child-nodes)))
(cond ((< num-children 2)
(error "Too few child nodes for alt ~S" child-nodes))
((= (length child-nodes) 2)
(add-instr alt-instr-num
`(alt-2-no-termcheck ,@child-instr-nums)))
(t (add-instr alt-instr-num
`(alt-no-termcheck ,child-instr-nums))))))
;; The arms may be replicated many times, so we need to be careful to re-use
;; them when necessary
(defun emit-casealt (child-nodes next)
(let* ((alt-instr-num (alloc-instr))
(arm-reuse-cache (make-hash-table :test 'equalp))
(child-instr-branches
(mapcar (lambda (arm)
(let* ((guard (first arm))
(consequent-node (second arm))
(prev-lbl (gethash consequent-node arm-reuse-cache)))
(if prev-lbl
(list guard prev-lbl)
(list guard (setf (gethash consequent-node arm-reuse-cache)
(emit-instr consequent-node next))))))
child-nodes))
(num-children (length child-nodes)))
(cond ((< num-children 2)
(error "Too few child nodes for alt ~S" child-nodes))
(t
(add-instr alt-instr-num
`(casealt ,child-instr-branches))))))
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