#:use-module (system base pmatch)
#:use-module (system base message)
#:use-module (language tree-il)
+ #:use-module (language tree-il primitives)
#:use-module (language glil)
#:use-module (srfi srfi-13))
(post-order! (lambda (x) (set! (tree-il-src x) #f))
x))
-(define-syntax assert-scheme->glil
- (syntax-rules ()
- ((_ in out)
- (let ((tree-il (strip-source
- (compile 'in #:from 'scheme #:to 'tree-il))))
- (pass-if 'in
- (equal? (unparse-glil (compile tree-il #:from 'tree-il #:to 'glil))
- 'out))))))
-
(define-syntax assert-tree-il->glil
- (syntax-rules ()
- ((_ in pat test ...)
+ (syntax-rules (with-partial-evaluation without-partial-evaluation
+ with-options)
+ ((_ with-partial-evaluation in pat test ...)
+ (assert-tree-il->glil with-options (#:partial-eval? #t)
+ in pat test ...))
+ ((_ without-partial-evaluation in pat test ...)
+ (assert-tree-il->glil with-options (#:partial-eval? #f)
+ in pat test ...))
+ ((_ with-options opts in pat test ...)
(let ((exp 'in))
(pass-if 'in
(let ((glil (unparse-glil
(compile (strip-source (parse-tree-il exp))
- #:from 'tree-il #:to 'glil))))
+ #:from 'tree-il #:to 'glil
+ #:opts 'opts))))
(pmatch glil
(pat (guard test ...) #t)
- (else #f))))))))
+ (else #f))))))
+ ((_ in pat test ...)
+ (assert-tree-il->glil with-partial-evaluation
+ in pat test ...))))
(define-syntax pass-if-tree-il->scheme
(syntax-rules ()
(pat (guard guard-exp) #t)
(_ #f))))))
+(define peval
+ ;; The partial evaluator.
+ (@@ (language tree-il optimize) peval))
+
+(define-syntax pass-if-peval
+ (syntax-rules (resolve-primitives)
+ ((_ in pat)
+ (pass-if-peval in pat
+ (compile 'in #:from 'scheme #:to 'tree-il)))
+ ((_ resolve-primitives in pat)
+ (pass-if-peval in pat
+ (expand-primitives!
+ (resolve-primitives!
+ (compile 'in #:from 'scheme #:to 'tree-il)
+ (current-module)))))
+ ((_ in pat code)
+ (pass-if 'in
+ (let ((evaled (unparse-tree-il (peval code))))
+ (pmatch evaled
+ (pat #t)
+ (_ (pk 'peval-mismatch)
+ ((@ (ice-9 pretty-print) pretty-print)
+ 'in)
+ (newline)
+ ((@ (ice-9 pretty-print) pretty-print)
+ evaled)
+ (newline)
+ ((@ (ice-9 pretty-print) pretty-print)
+ 'pat)
+ (newline)
+ #f)))))))
+
+\f
(with-test-prefix "tree-il->scheme"
(pass-if-tree-il->scheme
(case-lambda ((a) a) ((b c) (list b c)))
(const 1) (call return 1)
(label ,l2) (const 2) (call return 1))
(eq? l1 l2))
-
- (assert-tree-il->glil
+
+ (assert-tree-il->glil without-partial-evaluation
(begin (if (toplevel foo) (const 1) (const 2)) (const #f))
(program () (std-prelude 0 0 #f) (label _) (toplevel ref foo) (branch br-if-not ,l1) (branch br ,l2)
(label ,l3) (label ,l4) (const #f) (call return 1))
(call return 1))))
(with-test-prefix "lexical refs"
- (assert-tree-il->glil
+ (assert-tree-il->glil without-partial-evaluation
(let (x) (y) ((const 1)) (lexical x y))
(program () (std-prelude 0 1 #f) (label _)
(const 1) (bind (x #f 0)) (lexical #t #f set 0)
(lexical #t #f ref 0) (call return 1)
(unbind)))
- (assert-tree-il->glil
+ (assert-tree-il->glil without-partial-evaluation
(let (x) (y) ((const 1)) (begin (lexical x y) (const #f)))
(program () (std-prelude 0 1 #f) (label _)
(const 1) (bind (x #f 0)) (lexical #t #f set 0)
(const #f) (call return 1)
(unbind)))
- (assert-tree-il->glil
+ (assert-tree-il->glil without-partial-evaluation
(let (x) (y) ((const 1)) (apply (primitive null?) (lexical x y)))
(program () (std-prelude 0 1 #f) (label _)
(const 1) (bind (x #f 0)) (lexical #t #f set 0)
(toplevel ref bar)
(call return 1)))
- (assert-tree-il->glil
+ (assert-tree-il->glil without-partial-evaluation
(begin (toplevel bar) (const #f))
(program () (std-prelude 0 0 #f) (label _)
(toplevel ref bar) (call drop 1)
(const #f) (call return 1)))
(assert-tree-il->glil
+ ;; This gets simplified by `peval'.
(apply (primitive null?) (const 2))
(program () (std-prelude 0 0 #f) (label _)
- (const 2) (call null? 1) (call return 1))))
+ (const #f) (call return 1))))
(with-test-prefix "letrec"
;; simple bindings -> let
- (assert-tree-il->glil
+ (assert-tree-il->glil without-partial-evaluation
(letrec (x y) (x1 y1) ((const 10) (const 20))
(apply (toplevel foo) (lexical x x1) (lexical y y1)))
(program () (std-prelude 0 2 #f) (label _)
(unbind)))
;; complex bindings -> box and set! within let
- (assert-tree-il->glil
+ (assert-tree-il->glil without-partial-evaluation
(letrec (x y) (x1 y1) ((apply (toplevel foo)) (apply (toplevel bar)))
(apply (primitive +) (lexical x x1) (lexical y y1)))
(program () (std-prelude 0 4 #f) (label _)
(call add 2) (call return 1) (unbind)))
;; complex bindings in letrec* -> box and set! in order
- (assert-tree-il->glil
+ (assert-tree-il->glil without-partial-evaluation
(letrec* (x y) (x1 y1) ((apply (toplevel foo)) (apply (toplevel bar)))
(apply (primitive +) (lexical x x1) (lexical y y1)))
(program () (std-prelude 0 2 #f) (label _)
(call add 2) (call return 1) (unbind)))
;; simple bindings in letrec* -> equivalent to letrec
- (assert-tree-il->glil
+ (assert-tree-il->glil without-partial-evaluation
(letrec* (x y) (xx yy) ((const 1) (const 2))
(lexical y yy))
(program () (std-prelude 0 1 #f) (label _)
(const #t) (call return 1)))
(assert-tree-il->glil
+ ;; This gets simplified by `peval'.
(apply (primitive null?) (begin (const #f) (const 2)))
(program () (std-prelude 0 0 #f) (label _)
- (const 2) (call null? 1) (call return 1))))
+ (const #f) (call return 1))))
(with-test-prefix "values"
(assert-tree-il->glil
;; FIXME: binding info for or-hacked locals might bork the disassembler,
;; and could be tightened in any case
(with-test-prefix "the or hack"
- (assert-tree-il->glil
+ (assert-tree-il->glil without-partial-evaluation
(let (x) (y) ((const 1))
(if (lexical x y)
(lexical x y)
(eq? l1 l2))
;; second bound var is unreferenced
- (assert-tree-il->glil
+ (assert-tree-il->glil without-partial-evaluation
(let (x) (y) ((const 1))
(if (lexical x y)
(lexical x y)
(call tail-call 1))))
\f
+(with-test-prefix "partial evaluation"
+
+ (pass-if-peval
+ ;; First order, primitive.
+ (let ((x 1) (y 2)) (+ x y))
+ (const 3))
+
+ (pass-if-peval
+ ;; First order, thunk.
+ (let ((x 1) (y 2))
+ (let ((f (lambda () (+ x y))))
+ (f)))
+ (const 3))
+
+ (pass-if-peval resolve-primitives
+ ;; First order, let-values (requires primitive expansion for
+ ;; `call-with-values'.)
+ (let ((x 0))
+ (call-with-values
+ (lambda () (if (zero? x) (values 1 2) (values 3 4)))
+ (lambda (a b)
+ (+ a b))))
+ (const 3))
+
+ (pass-if-peval
+ ;; First order, coalesced, mutability preserved.
+ (cons 0 (cons 1 (cons 2 (list 3 4 5))))
+ (apply (primitive list)
+ (const 0) (const 1) (const 2) (const 3) (const 4) (const 5)))
+
+ (pass-if-peval
+ ;; First order, coalesced, mutability preserved.
+ (cons 0 (cons 1 (cons 2 (list 3 4 5))))
+ ;; This must not be a constant.
+ (apply (primitive list)
+ (const 0) (const 1) (const 2) (const 3) (const 4) (const 5)))
+
+ (pass-if-peval
+ ;; First order, coalesced, immutability preserved.
+ (cons 0 (cons 1 (cons 2 '(3 4 5))))
+ (apply (primitive cons) (const 0)
+ (apply (primitive cons) (const 1)
+ (apply (primitive cons) (const 2)
+ (const (3 4 5))))))
+
+ ;; These two tests doesn't work any more because we changed the way we
+ ;; deal with constants -- now the algorithm will see a construction as
+ ;; being bound to the lexical, so it won't propagate it. It can't
+ ;; even propagate it in the case that it is only referenced once,
+ ;; because:
+ ;;
+ ;; (let ((x (cons 1 2))) (lambda () x))
+ ;;
+ ;; is not the same as
+ ;;
+ ;; (lambda () (cons 1 2))
+ ;;
+ ;; Perhaps if we determined that not only was it only referenced once,
+ ;; it was not closed over by a lambda, then we could propagate it, and
+ ;; re-enable these two tests.
+ ;;
+ #;
+ (pass-if-peval
+ ;; First order, mutability preserved.
+ (let loop ((i 3) (r '()))
+ (if (zero? i)
+ r
+ (loop (1- i) (cons (cons i i) r))))
+ (apply (primitive list)
+ (apply (primitive cons) (const 1) (const 1))
+ (apply (primitive cons) (const 2) (const 2))
+ (apply (primitive cons) (const 3) (const 3))))
+ ;;
+ ;; See above.
+ #;
+ (pass-if-peval
+ ;; First order, evaluated.
+ (let loop ((i 7)
+ (r '()))
+ (if (<= i 0)
+ (car r)
+ (loop (1- i) (cons i r))))
+ (const 1))
+
+ ;; Instead here are tests for what happens for the above cases: they
+ ;; unroll but they don't fold.
+ (pass-if-peval
+ (let loop ((i 3) (r '()))
+ (if (zero? i)
+ r
+ (loop (1- i) (cons (cons i i) r))))
+ (let (r) (_)
+ ((apply (primitive list)
+ (apply (primitive cons) (const 3) (const 3))))
+ (let (r) (_)
+ ((apply (primitive cons)
+ (apply (primitive cons) (const 2) (const 2))
+ (lexical r _)))
+ (apply (primitive cons)
+ (apply (primitive cons) (const 1) (const 1))
+ (lexical r _)))))
+
+ ;; See above.
+ (pass-if-peval
+ (let loop ((i 4)
+ (r '()))
+ (if (<= i 0)
+ (car r)
+ (loop (1- i) (cons i r))))
+ (let (r) (_)
+ ((apply (primitive list) (const 4)))
+ (let (r) (_)
+ ((apply (primitive cons)
+ (const 3)
+ (lexical r _)))
+ (let (r) (_)
+ ((apply (primitive cons)
+ (const 2)
+ (lexical r _)))
+ (let (r) (_)
+ ((apply (primitive cons)
+ (const 1)
+ (lexical r _)))
+ (apply (primitive car)
+ (lexical r _)))))))
+
+ ;; Static sums.
+ (pass-if-peval
+ (let loop ((l '(1 2 3 4)) (sum 0))
+ (if (null? l)
+ sum
+ (loop (cdr l) (+ sum (car l)))))
+ (const 10))
+
+ (pass-if-peval
+ ;; Primitives in module-refs are resolved (the expansion of `pmatch'
+ ;; below leads to calls to (@@ (system base pmatch) car) and
+ ;; similar, which is what we want to be inlined.)
+ (begin
+ (use-modules (system base pmatch))
+ (pmatch '(a b c d)
+ ((a b . _)
+ #t)))
+ (begin
+ (apply . _)
+ (const #t)))
+
+ (pass-if-peval
+ ;; Mutability preserved.
+ ((lambda (x y z) (list x y z)) 1 2 3)
+ (apply (primitive list) (const 1) (const 2) (const 3)))
+
+ (pass-if-peval
+ ;; Don't propagate effect-free expressions that operate on mutable
+ ;; objects.
+ (let* ((x (list 1))
+ (y (car x)))
+ (set-car! x 0)
+ y)
+ (let (x) (_) ((apply (primitive list) (const 1)))
+ (let (y) (_) ((apply (primitive car) (lexical x _)))
+ (begin
+ (apply (toplevel set-car!) (lexical x _) (const 0))
+ (lexical y _)))))
+
+ (pass-if-peval
+ ;; Don't propagate effect-free expressions that operate on objects we
+ ;; don't know about.
+ (let ((y (car x)))
+ (set-car! x 0)
+ y)
+ (let (y) (_) ((apply (primitive car) (toplevel x)))
+ (begin
+ (apply (toplevel set-car!) (toplevel x) (const 0))
+ (lexical y _))))
+
+ (pass-if-peval
+ ;; Infinite recursion
+ ((lambda (x) (x x)) (lambda (x) (x x)))
+ (let (x) (_)
+ ((lambda _
+ (lambda-case
+ (((x) _ _ _ _ _)
+ (apply (lexical x _) (lexical x _))))))
+ (apply (lexical x _) (lexical x _))))
+
+ (pass-if-peval
+ ;; First order, aliased primitive.
+ (let* ((x *) (y (x 1 2))) y)
+ (const 2))
+
+ (pass-if-peval
+ ;; First order, shadowed primitive.
+ (begin
+ (define (+ x y) (pk x y))
+ (+ 1 2))
+ (begin
+ (define +
+ (lambda (_)
+ (lambda-case
+ (((x y) #f #f #f () (_ _))
+ (apply (toplevel pk) (lexical x _) (lexical y _))))))
+ (apply (toplevel +) (const 1) (const 2))))
+
+ (pass-if-peval
+ ;; First-order, effects preserved.
+ (let ((x 2))
+ (do-something!)
+ x)
+ (begin
+ (apply (toplevel do-something!))
+ (const 2)))
+
+ (pass-if-peval
+ ;; First order, residual bindings removed.
+ (let ((x 2) (y 3))
+ (* (+ x y) z))
+ (apply (primitive *) (const 5) (toplevel z)))
+
+ (pass-if-peval
+ ;; First order, with lambda.
+ (define (foo x)
+ (define (bar z) (* z z))
+ (+ x (bar 3)))
+ (define foo
+ (lambda (_)
+ (lambda-case
+ (((x) #f #f #f () (_))
+ (apply (primitive +) (lexical x _) (const 9)))))))
+
+ (pass-if-peval
+ ;; First order, with lambda inlined & specialized twice.
+ (let ((f (lambda (x y)
+ (+ (* x top) y)))
+ (x 2)
+ (y 3))
+ (+ (* x (f x y))
+ (f something x)))
+ (apply (primitive +)
+ (apply (primitive *)
+ (const 2)
+ (apply (primitive +) ; (f 2 3)
+ (apply (primitive *)
+ (const 2)
+ (toplevel top))
+ (const 3)))
+ (let (x) (_) ((toplevel something)) ; (f something 2)
+ ;; `something' is not const, so preserve order of
+ ;; effects with a lexical binding.
+ (apply (primitive +)
+ (apply (primitive *)
+ (lexical x _)
+ (toplevel top))
+ (const 2)))))
+
+ (pass-if-peval
+ ;; First order, with lambda inlined & specialized 3 times.
+ (let ((f (lambda (x y) (if (> x 0) y x))))
+ (+ (f -1 0)
+ (f 1 0)
+ (f -1 y)
+ (f 2 y)
+ (f z y)))
+ (apply (primitive +)
+ (const -1) ; (f -1 0)
+ (const 0) ; (f 1 0)
+ (begin (toplevel y) (const -1)) ; (f -1 y)
+ (toplevel y) ; (f 2 y)
+ (let (x y) (_ _) ((toplevel z) (toplevel y)) ; (f z y)
+ (if (apply (primitive >) (lexical x _) (const 0))
+ (lexical y _)
+ (lexical x _)))))
+
+ (pass-if-peval
+ ;; First order, conditional.
+ (let ((y 2))
+ (lambda (x)
+ (if (> y 0)
+ (display x)
+ 'never-reached)))
+ (lambda ()
+ (lambda-case
+ (((x) #f #f #f () (_))
+ (apply (toplevel display) (lexical x _))))))
+
+ (pass-if-peval
+ ;; First order, recursive procedure.
+ (letrec ((fibo (lambda (n)
+ (if (<= n 1)
+ n
+ (+ (fibo (- n 1))
+ (fibo (- n 2)))))))
+ (fibo 4))
+ (const 3))
+
+ (pass-if-peval
+ ;; Don't propagate toplevel references, as intervening expressions
+ ;; could alter their bindings.
+ (let ((x top))
+ (foo)
+ x)
+ (let (x) (_) ((toplevel top))
+ (begin
+ (apply (toplevel foo))
+ (lexical x _))))
+
+ (pass-if-peval
+ ;; Higher order.
+ ((lambda (f x)
+ (f (* (car x) (cadr x))))
+ (lambda (x)
+ (+ x 1))
+ '(2 3))
+ (const 7))
+
+ (pass-if-peval
+ ;; Higher order with optional argument (default value).
+ ((lambda* (f x #:optional (y 0))
+ (+ y (f (* (car x) (cadr x)))))
+ (lambda (x)
+ (+ x 1))
+ '(2 3))
+ (const 7))
+
+ (pass-if-peval
+ ;; Higher order with optional argument (caller-supplied value).
+ ((lambda* (f x #:optional (y 0))
+ (+ y (f (* (car x) (cadr x)))))
+ (lambda (x)
+ (+ x 1))
+ '(2 3)
+ 35)
+ (const 42))
+
+ (pass-if-peval
+ ;; Higher order with optional argument (side-effecting default
+ ;; value).
+ ((lambda* (f x #:optional (y (foo)))
+ (+ y (f (* (car x) (cadr x)))))
+ (lambda (x)
+ (+ x 1))
+ '(2 3))
+ (let (y) (_) ((apply (toplevel foo)))
+ (apply (primitive +) (lexical y _) (const 7))))
+
+ (pass-if-peval
+ ;; Higher order with optional argument (caller-supplied value).
+ ((lambda* (f x #:optional (y (foo)))
+ (+ y (f (* (car x) (cadr x)))))
+ (lambda (x)
+ (+ x 1))
+ '(2 3)
+ 35)
+ (const 42))
+
+ (pass-if-peval
+ ;; Higher order.
+ ((lambda (f) (f x)) (lambda (x) x))
+ (toplevel x))
+
+ (pass-if-peval
+ ;; Bug reported at
+ ;; <https://lists.gnu.org/archive/html/bug-guile/2011-09/msg00019.html>.
+ (let ((fold (lambda (f g) (f (g top)))))
+ (fold 1+ (lambda (x) x)))
+ (apply (primitive 1+) (toplevel top)))
+
+ (pass-if-peval
+ ;; Procedure not inlined when residual code contains recursive calls.
+ ;; <http://debbugs.gnu.org/9542>
+ (letrec ((fold (lambda (f x3 b null? car cdr)
+ (if (null? x3)
+ b
+ (f (car x3) (fold f (cdr x3) b null? car cdr))))))
+ (fold * x 1 zero? (lambda (x1) x1) (lambda (x2) (- x2 1))))
+ (letrec (fold) (_) (_)
+ (apply (lexical fold _)
+ (primitive *)
+ (toplevel x)
+ (const 1)
+ (primitive zero?)
+ (lambda ()
+ (lambda-case
+ (((x1) #f #f #f () (_))
+ (lexical x1 _))))
+ (lambda ()
+ (lambda-case
+ (((x2) #f #f #f () (_))
+ (apply (primitive -) (lexical x2 _) (const 1))))))))
+
+ (pass-if "inlined lambdas are alpha-renamed"
+ ;; In this example, `make-adder' is inlined more than once; thus,
+ ;; they should use different gensyms for their arguments, because
+ ;; the various optimization passes assume uniquely-named variables.
+ ;;
+ ;; Bug reported at
+ ;; <https://lists.gnu.org/archive/html/bug-guile/2011-09/msg00019.html> and
+ ;; <https://lists.gnu.org/archive/html/bug-guile/2011-09/msg00029.html>.
+ (pmatch (unparse-tree-il
+ (peval (compile
+ '(let ((make-adder
+ (lambda (x) (lambda (y) (+ x y)))))
+ (cons (make-adder 1) (make-adder 2)))
+ #:to 'tree-il)))
+ ((apply (primitive cons)
+ (lambda ()
+ (lambda-case
+ (((y) #f #f #f () (,gensym1))
+ (apply (primitive +)
+ (const 1)
+ (lexical y ,ref1)))))
+ (lambda ()
+ (lambda-case
+ (((y) #f #f #f () (,gensym2))
+ (apply (primitive +)
+ (const 2)
+ (lexical y ,ref2))))))
+ (and (eq? gensym1 ref1)
+ (eq? gensym2 ref2)
+ (not (eq? gensym1 gensym2))))
+ (_ #f)))
+
+ (pass-if-peval
+ ;; Unused letrec bindings are pruned.
+ (letrec ((a (lambda () (b)))
+ (b (lambda () (a)))
+ (c (lambda (x) x)))
+ (c 10))
+ (const 10))
+
+ (pass-if-peval
+ ;; Unused letrec bindings are pruned.
+ (letrec ((a (foo!))
+ (b (lambda () (a)))
+ (c (lambda (x) x)))
+ (c 10))
+ (begin (apply (toplevel foo!))
+ (const 10)))
+
+ (pass-if-peval
+ ;; Higher order, mutually recursive procedures.
+ (letrec ((even? (lambda (x)
+ (or (= 0 x)
+ (odd? (- x 1)))))
+ (odd? (lambda (x)
+ (not (even? x)))))
+ (and (even? 4) (odd? 7)))
+ (const #t))
+
+ ;;
+ ;; Below are cases where constant propagation should bail out.
+ ;;
+
+ (pass-if-peval
+ ;; Non-constant lexical is not propagated.
+ (let ((v (make-vector 6 #f)))
+ (lambda (n)
+ (vector-set! v n n)))
+ (let (v) (_)
+ ((apply (toplevel make-vector) (const 6) (const #f)))
+ (lambda ()
+ (lambda-case
+ (((n) #f #f #f () (_))
+ (apply (toplevel vector-set!)
+ (lexical v _) (lexical n _) (lexical n _)))))))
+
+ (pass-if-peval
+ ;; Mutable lexical is not propagated.
+ (let ((v (vector 1 2 3)))
+ (lambda ()
+ v))
+ (let (v) (_)
+ ((apply (primitive vector) (const 1) (const 2) (const 3)))
+ (lambda ()
+ (lambda-case
+ ((() #f #f #f () ())
+ (lexical v _))))))
+
+ (pass-if-peval
+ ;; Lexical that is not provably pure is not inlined nor propagated.
+ (let* ((x (if (> p q) (frob!) (display 'chbouib)))
+ (y (* x 2)))
+ (+ x x y))
+ (let (x) (_) ((if (apply (primitive >) (toplevel p) (toplevel q))
+ (apply (toplevel frob!))
+ (apply (toplevel display) (const chbouib))))
+ (let (y) (_) ((apply (primitive *) (lexical x _) (const 2)))
+ (apply (primitive +)
+ (lexical x _) (lexical x _) (lexical y _)))))
+
+ (pass-if-peval
+ ;; Non-constant arguments not propagated to lambdas.
+ ((lambda (x y z)
+ (vector-set! x 0 0)
+ (set-car! y 0)
+ (set-cdr! z '()))
+ (vector 1 2 3)
+ (make-list 10)
+ (list 1 2 3))
+ (let (x y z) (_ _ _)
+ ((apply (primitive vector) (const 1) (const 2) (const 3))
+ (apply (toplevel make-list) (const 10))
+ (apply (primitive list) (const 1) (const 2) (const 3)))
+ (begin
+ (apply (toplevel vector-set!)
+ (lexical x _) (const 0) (const 0))
+ (apply (toplevel set-car!)
+ (lexical y _) (const 0))
+ (apply (toplevel set-cdr!)
+ (lexical z _) (const ())))))
+
+ (pass-if-peval
+ (let ((foo top-foo) (bar top-bar))
+ (let* ((g (lambda (x y) (+ x y)))
+ (f (lambda (g x) (g x x))))
+ (+ (f g foo) (f g bar))))
+ (let (foo bar) (_ _) ((toplevel top-foo) (toplevel top-bar))
+ (apply (primitive +)
+ (apply (primitive +) (lexical foo _) (lexical foo _))
+ (apply (primitive +) (lexical bar _) (lexical bar _)))))
+
+ (pass-if-peval
+ ;; Fresh objects are not turned into constants, nor are constants
+ ;; turned into fresh objects.
+ (let* ((c '(2 3))
+ (x (cons 1 c))
+ (y (cons 0 x)))
+ y)
+ (let (x) (_) ((apply (primitive cons) (const 1) (const (2 3))))
+ (apply (primitive cons) (const 0) (lexical x _))))
+
+ (pass-if-peval
+ ;; Bindings mutated.
+ (let ((x 2))
+ (set! x 3)
+ x)
+ (let (x) (_) ((const 2))
+ (begin
+ (set! (lexical x _) (const 3))
+ (lexical x _))))
+
+ (pass-if-peval
+ ;; Bindings mutated.
+ (letrec ((x 0)
+ (f (lambda ()
+ (set! x (+ 1 x))
+ x)))
+ (frob f) ; may mutate `x'
+ x)
+ (letrec (x) (_) ((const 0))
+ (begin
+ (apply (toplevel frob) (lambda _ _))
+ (lexical x _))))
+
+ (pass-if-peval
+ ;; Bindings mutated.
+ (letrec ((f (lambda (x)
+ (set! f (lambda (_) x))
+ x)))
+ (f 2))
+ (letrec _ . _))
+
+ (pass-if-peval
+ ;; Bindings possibly mutated.
+ (let ((x (make-foo)))
+ (frob! x) ; may mutate `x'
+ x)
+ (let (x) (_) ((apply (toplevel make-foo)))
+ (begin
+ (apply (toplevel frob!) (lexical x _))
+ (lexical x _))))
+
+ (pass-if-peval
+ ;; Inlining stops at recursive calls with dynamic arguments.
+ (let loop ((x x))
+ (if (< x 0) x (loop (1- x))))
+ (letrec (loop) (_) ((lambda (_)
+ (lambda-case
+ (((x) #f #f #f () (_))
+ (if _ _
+ (apply (lexical loop _)
+ (apply (primitive 1-)
+ (lexical x _))))))))
+ (apply (lexical loop _) (toplevel x))))
+
+ (pass-if-peval
+ ;; Recursion on the 2nd argument is fully evaluated.
+ (let ((x (top)))
+ (let loop ((x x) (y 10))
+ (if (> y 0)
+ (loop x (1- y))
+ (foo x y))))
+ (let (x) (_) ((apply (toplevel top)))
+ (apply (toplevel foo) (lexical x _) (const 0))))
+
+ (pass-if-peval
+ ;; Inlining aborted when residual code contains recursive calls.
+ ;;
+ ;; <http://debbugs.gnu.org/9542>
+ (let loop ((x x) (y 0))
+ (if (> y 0)
+ (loop (1- x) (1- y))
+ (if (< x 0)
+ x
+ (loop (1+ x) (1+ y)))))
+ (letrec (loop) (_) ((lambda (_)
+ (lambda-case
+ (((x y) #f #f #f () (_ _))
+ (if (apply (primitive >)
+ (lexical y _) (const 0))
+ _ _)))))
+ (apply (lexical loop _) (toplevel x) (const 0))))
+
+ (pass-if-peval
+ ;; Infinite recursion: `peval' gives up and leaves it as is.
+ (letrec ((f (lambda (x) (g (1- x))))
+ (g (lambda (x) (h (1+ x))))
+ (h (lambda (x) (f x))))
+ (f 0))
+ (letrec _ . _))
+
+ (pass-if-peval
+ ;; Infinite recursion: all the arguments to `loop' are static, but
+ ;; unrolling it would lead `peval' to enter an infinite loop.
+ (let loop ((x 0))
+ (and (< x top)
+ (loop (1+ x))))
+ (letrec (loop) (_) ((lambda . _))
+ (apply (lexical loop _) (const 0))))
+
+ (pass-if-peval
+ ;; This test checks that the `start' binding is indeed residualized.
+ ;; See the `referenced?' procedure in peval's `prune-bindings'.
+ (let ((pos 0))
+ (set! pos 1) ;; Cause references to `pos' to residualize.
+ (let ((here (let ((start pos)) (lambda () start))))
+ (here)))
+ (let (pos) (_) ((const 0))
+ (begin
+ (set! (lexical pos _) (const 1))
+ (let (here) (_) (_)
+ (apply (lexical here _))))))
+
+ (pass-if-peval
+ ;; FIXME: should this one residualize the binding?
+ (letrec ((a a))
+ 1)
+ (const 1))
+
+ (pass-if-peval
+ ;; This is a fun one for peval to handle.
+ (letrec ((a a))
+ a)
+ (letrec (a) (_) ((lexical a _))
+ (lexical a _)))
+
+ (pass-if-peval
+ ;; Another interesting recursive case.
+ (letrec ((a b) (b a))
+ a)
+ (letrec (a) (_) ((lexical a _))
+ (lexical a _)))
+
+ (pass-if-peval
+ ;; Another pruning case, that `a' is residualized.
+ (letrec ((a (lambda () (a)))
+ (b (lambda () (a)))
+ (c (lambda (x) x)))
+ (let ((d (foo b)))
+ (c d)))
+
+ ;; "b c a" is the current order that we get with unordered letrec,
+ ;; but it's not important to this test, so if it changes, just adapt
+ ;; the test.
+ (letrec (b c a) (_ _ _)
+ ((lambda _
+ (lambda-case
+ ((() #f #f #f () ())
+ (apply (lexical a _)))))
+ (lambda _
+ (lambda-case
+ (((x) #f #f #f () (_))
+ (lexical x _))))
+ (lambda _
+ (lambda-case
+ ((() #f #f #f () ())
+ (apply (lexical a _))))))
+ (let (d)
+ (_)
+ ((apply (toplevel foo) (lexical b _)))
+ (apply (lexical c _)
+ (lexical d _)))))
+
+ (pass-if-peval
+ ;; In this case, we can prune the bindings. `a' ends up being copied
+ ;; because it is only referenced once in the source program. Oh
+ ;; well.
+ (letrec* ((a (lambda (x) (top x)))
+ (b (lambda () a)))
+ (foo (b) (b)))
+ (apply (toplevel foo)
+ (lambda _
+ (lambda-case
+ (((x) #f #f #f () (_))
+ (apply (toplevel top) (lexical x _)))))
+ (lambda _
+ (lambda-case
+ (((x) #f #f #f () (_))
+ (apply (toplevel top) (lexical x _)))))))
+
+ (pass-if-peval
+ ;; Constant folding: cons
+ (begin (cons 1 2) #f)
+ (const #f))
+
+ (pass-if-peval
+ ;; Constant folding: cons
+ (begin (cons (foo) 2) #f)
+ (begin (apply (toplevel foo)) (const #f)))
+
+ (pass-if-peval
+ ;; Constant folding: cons
+ (if (cons 0 0) 1 2)
+ (const 1))
+
+ (pass-if-peval
+ ;; Constant folding: car+cons
+ (car (cons 1 0))
+ (const 1))
+
+ (pass-if-peval
+ ;; Constant folding: cdr+cons
+ (cdr (cons 1 0))
+ (const 0))
+
+ (pass-if-peval
+ ;; Constant folding: car+cons, impure
+ (car (cons 1 (bar)))
+ (begin (apply (toplevel bar)) (const 1)))
+
+ (pass-if-peval
+ ;; Constant folding: cdr+cons, impure
+ (cdr (cons (bar) 0))
+ (begin (apply (toplevel bar)) (const 0)))
+
+ (pass-if-peval
+ ;; Constant folding: car+list
+ (car (list 1 0))
+ (const 1))
+
+ (pass-if-peval
+ ;; Constant folding: cdr+list
+ (cdr (list 1 0))
+ (apply (primitive list) (const 0)))
+
+ (pass-if-peval
+ ;; Constant folding: car+list, impure
+ (car (list 1 (bar)))
+ (begin (apply (toplevel bar)) (const 1)))
+
+ (pass-if-peval
+ ;; Constant folding: cdr+list, impure
+ (cdr (list (bar) 0))
+ (begin (apply (toplevel bar)) (apply (primitive list) (const 0))))
+
+ (pass-if-peval
+ resolve-primitives
+ ;; Prompt is removed if tag is unreferenced
+ (let ((tag (make-prompt-tag)))
+ (call-with-prompt tag
+ (lambda () 1)
+ (lambda args args)))
+ (const 1))
+
+ (pass-if-peval
+ resolve-primitives
+ ;; Prompt is removed if tag is unreferenced, with explicit stem
+ (let ((tag (make-prompt-tag "foo")))
+ (call-with-prompt tag
+ (lambda () 1)
+ (lambda args args)))
+ (const 1))
+
+ (pass-if-peval
+ resolve-primitives
+ ;; `while' without `break' or `continue' has no prompts and gets its
+ ;; condition folded. Unfortunately the outer `lp' does not yet get
+ ;; elided.
+ (while #t #t)
+ (letrec (lp) (_)
+ ((lambda _
+ (lambda-case
+ ((() #f #f #f () ())
+ (letrec (loop) (_)
+ ((lambda _
+ (lambda-case
+ ((() #f #f #f () ())
+ (apply (lexical loop _))))))
+ (apply (lexical loop _)))))))
+ (apply (lexical lp _)))))
+
+
+\f
(with-test-prefix "tree-il-fold"
(pass-if "empty tree"
HCoop / bpt / guile.git / blobdiff