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aa49787b5e
* We cache callees in each module, and keep a list of modified
('tainted') modules, which is used to reconstruct the callers
database incrementally.
* `procedure-callers' now returns an a-list, keyed by module name.
182 lines
7.4 KiB
Scheme
182 lines
7.4 KiB
Scheme
;;;; Copyright (C) 2009 Free Software Foundation, Inc.
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;;;;
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;;;; This library is free software; you can redistribute it and/or
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;;;; modify it under the terms of the GNU Lesser General Public
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;;;; License as published by the Free Software Foundation; either
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;;;; version 2.1 of the License, or (at your option) any later version.
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;;;;
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;;;; This library is distributed in the hope that it will be useful,
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;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;;; Lesser General Public License for more details.
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;;;;
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;;;; You should have received a copy of the GNU Lesser General Public
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;;;; License along with this library; if not, write to the Free Software
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;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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;;;;
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(define-module (system xref)
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#:use-module (system base pmatch)
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#:use-module (system base compile)
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#:use-module (system vm program)
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#:use-module (srfi srfi-1)
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#:export (*xref-ignored-modules*
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procedure-callees
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procedure-callers))
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(define (program-callee-rev-vars prog)
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(define (cons-uniq x y)
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(if (memq x y) y (cons x y)))
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(cond
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((program-objects prog)
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=> (lambda (objects)
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(let ((n (vector-length objects))
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(progv (make-vector (vector-length objects) #f))
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(asm (decompile (program-objcode prog) #:to 'assembly)))
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(pmatch asm
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((load-program ,nargs ,nrest ,nlocs ,next ,labels ,len . ,body)
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(for-each
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(lambda (x)
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(pmatch x
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((toplevel-ref ,n) (vector-set! progv n #t))
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((toplevel-set ,n) (vector-set! progv n #t))))
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body)))
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(let lp ((i 0) (out '()))
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(cond
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((= i n) out)
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((program? (vector-ref objects i))
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(lp (1+ i)
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(fold cons-uniq out
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(program-callee-rev-vars (vector-ref objects i)))))
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((vector-ref progv i)
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(let ((obj (vector-ref objects i)))
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(if (variable? obj)
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(lp (1+ i) (cons-uniq obj out))
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;; otherwise it's an unmemoized binding
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(pmatch obj
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(,sym (guard (symbol? sym))
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(let ((v (module-variable (or (program-module prog)
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the-root-module)
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sym)))
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(lp (1+ i) (if v (cons-uniq v out) out))))
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((,mod ,sym ,public?)
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;; hm, hacky.
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(let* ((m (nested-ref the-root-module
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(append '(%app modules) mod)))
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(v (and m
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(module-variable
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(if public?
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(module-public-interface m)
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m)
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sym))))
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(lp (1+ i)
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(if v (cons-uniq v out) out))))))))
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(else (lp (1+ i) out)))))))
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(else '())))
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(define (procedure-callee-rev-vars proc)
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(cond
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((program? proc) (program-callee-rev-vars proc))
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(else '())))
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(define (procedure-callees prog)
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"Evaluates to a list of the given program callees."
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(let lp ((in (procedure-callee-rev-vars prog)) (out '()))
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(cond ((null? in) out)
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((variable-bound? (car in))
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(lp (cdr in) (cons (variable-ref (car in)) out)))
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(else (lp (cdr in) out)))))
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;; var -> ((module-name caller ...) ...)
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(define *callers-db* #f)
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;; module-name -> (callee ...)
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(define *module-callees-db* (make-hash-table))
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;; (module-name ...)
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(define *tainted-modules* '())
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(define *xref-ignored-modules* '((value-history)))
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(define (on-module-modified m)
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(let ((name (module-name m)))
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(if (and (not (member name *xref-ignored-modules*))
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(not (member name *tainted-modules*))
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(pair? name))
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(set! *tainted-modules* (cons name *tainted-modules*)))))
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(define (add-caller callee caller mod-name)
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(let ((all-callers (hashq-ref *callers-db* callee)))
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(if (not all-callers)
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(hashq-set! *callers-db* callee `((,mod-name ,caller)))
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(let ((callers (assoc mod-name all-callers)))
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(if callers
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(if (not (member caller callers))
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(set-cdr! callers (cons caller (cdr callers))))
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(hashq-set! *callers-db* callee
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(cons `(,mod-name ,caller) all-callers)))))))
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(define (forget-callers callee mod-name)
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(hashq-set! *callers-db* callee
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(assoc-remove! (hashq-ref *callers-db* callee '()) mod-name)))
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(define (add-callees callees mod-name)
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(hash-set! *module-callees-db* mod-name
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(append callees (hash-ref *module-callees-db* mod-name '()))))
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(define (untaint-modules)
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(define (untaint m)
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(for-each (lambda (callee) (forget-callers callee m))
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(hash-ref *module-callees-db* m '()))
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(ensure-callers-db m))
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(ensure-callers-db #f)
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(for-each untaint *tainted-modules*)
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(set! *tainted-modules* '()))
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(define (ensure-callers-db mod-name)
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(let ((mod (and mod-name (resolve-module mod-name)))
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(visited #f))
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(define (visit-variable var recurse mod-name)
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(if (variable-bound? var)
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(let ((x (variable-ref var)))
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(cond
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((and visited (hashq-ref visited x)))
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((procedure? x)
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(if visited (hashq-set! visited x #t))
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(let ((callees (filter variable-bound?
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(procedure-callee-rev-vars x))))
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(for-each (lambda (callee)
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(add-caller callee x mod-name))
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callees)
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(add-callees callees mod-name)))
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((and recurse (module? x))
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(visit-module x #t))))))
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(define (visit-module mod recurse)
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(if visited (hashq-set! visited mod #t))
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(if (not (memq on-module-modified (module-observers mod)))
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(module-observe mod on-module-modified))
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(let ((name (module-name mod)))
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(module-for-each (lambda (sym var)
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(visit-variable var recurse name))
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mod)))
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(cond ((and (not mod-name) (not *callers-db*))
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(set! *callers-db* (make-hash-table 1000))
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(set! visited (make-hash-table 1000))
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(visit-module the-root-module #t))
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(mod-name (visit-module mod #f)))))
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(define (procedure-callers var)
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"Returns an association list, keyed by module name, of known callers
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of the given procedure. The latter can specified directly as a
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variable, a symbol (which gets resolved in the current module) or a
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pair of the form (module-name . variable-name), "
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(let ((v (cond ((variable? var) var)
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((symbol? var) (module-variable (current-module) var))
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(else
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(pmatch var
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((,modname . ,sym)
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(module-variable (resolve-module modname) sym))
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(else
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(error "expected a variable, symbol, or (modname . sym)" var)))))))
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(untaint-modules)
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(hashq-ref *callers-db* v '())))
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