3m bug fix for function calls chained with &&, ||, etc
svn: r4072
This commit is contained in:
Matthew Flatt
parent
6cedffd7c0
commit
87e78e0f96
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@ -613,15 +613,23 @@
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"SET_GC_VARIABLE_STACK(__gc_var_stack__), ")
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"__gc_var_stack__[1] = (void *)x)~n"))
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;; Debugging support:
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(printf "#ifdef MZ_3M_CHECK_VAR_STACK\n")
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(printf "static int _bad_var_stack_() { *(long *)0x0 = 1; return 0; }\n")
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(printf "# define CHECK_GC_V_S ((GC_VARIABLE_STACK == __gc_var_stack__) ? 0 : _bad_var_stack_()),\n")
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(printf "#else\n")
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(printf "# define CHECK_GC_V_S /*empty*/\n")
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(printf "#endif\n")
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;; Call a function where the number of registered variables can change in
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;; nested blocks:
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(printf "#define FUNCCALL_each(setup, x) (setup, x)~n")
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(printf "#define FUNCCALL_each(setup, x) (CHECK_GC_V_S setup, x)~n")
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;; The same, but a "tail" call:
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(printf "#define FUNCCALL_EMPTY_each(x) FUNCCALL_each(SET_GC_VARIABLE_STACK((void **)__gc_var_stack__[0]), x)~n")
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(printf "#define FUNCCALL_EMPTY_each(x) (SET_GC_VARIABLE_STACK((void **)__gc_var_stack__[0]), x)~n")
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;; The same, but the number of registered variables for this call is definitely
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;; the same as for the previous call:
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(printf (if callee-restore?
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"#define FUNCCALL_AGAIN_each(x) x~n"
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"#define FUNCCALL_AGAIN_each(x) (CHECK_GC_V_S x)~n"
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"#define FUNCCALL_AGAIN_each(x) FUNCCALL_each(SET_GC_VARIABLE_STACK(__gc_var_stack__), x)~n"))
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;; As above, but when the number of registered variables never changes
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@ -3091,11 +3099,11 @@
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;; because they're blessed by the lifter]
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(let ([e- (reverse e)]
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[orig-num-calls (live-var-info-num-calls live-vars)])
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(let loop ([e- e-][result null][live-vars live-vars])
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(let loop ([e- e-][result null][live-vars live-vars][converted-sub? #f])
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(cond
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[(null? e-) (values result live-vars)]
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[(ignored-stuff? e-)
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(loop (cdr e-) (cons (car e-) result) live-vars)]
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(loop (cdr e-) (cons (car e-) result) live-vars converted-sub?)]
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[(eq? 'return (tok-n (car e-)))
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;; Look forward in result to semicolon, and wrap that:
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(let rloop ([result result][l null])
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@ -3107,15 +3115,20 @@
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(if (null? l)
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(cons (make-tok RET_NOTHING (tok-line (car e-)) (tok-file (car e-)))
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result)
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(let ([has-empty-funccall? (let loop ([l l])
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(let ([has-empty-funccall?
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;; All calls must be empty calls, otherwise
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;; the result might not depend on the empty call
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;; (e.g., f() && empty(f()) )
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(let loop ([l l][one? #f])
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(cond
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[(null? l) #f]
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[(and (call? (car l))
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(null? (call-live (car l))))
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#t]
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[(null? l) one?]
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[(call? (car l))
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(if (null? (call-live (car l)))
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(loop (cdr l) #t)
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#f)]
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[(seq? (car l))
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(or (loop (seq->list (seq-in (car l))))
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(loop (cdr l)))]
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(and (loop (seq->list (seq-in (car l))) one?)
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(loop (cdr l) one?))]
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[else #f]))])
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(list* (make-tok (if has-empty-funccall?
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RET_VALUE_EMPTY_START
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@ -3129,7 +3142,8 @@
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RET_VALUE_END)
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(tok-line (car e-)) (tok-file (car e-)))
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result)))
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live-vars)]
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live-vars
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converted-sub?)]
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[else (rloop (cdr result) (cons (car result) l))]))]
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[(looks-like-call? e-)
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;; Looks like a function call, maybe a cast:
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@ -3141,7 +3155,8 @@
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(convert-paren-interior (car e-) vars &-vars c++-class live-vars complain-not-in #f)])
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(loop (cddr e-)
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(list* (cadr e-) v result)
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live-vars)))
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live-vars
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#t)))
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(lambda ()
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;; It's a function call; find the start
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(let-values ([(args) (car e-)]
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@ -3246,7 +3261,8 @@
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(or (and (null? (cdr func))
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(memq (tok-n (car func)) non-returning-functions))
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(and (pair? rest-)
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(eq? 'return (tok-n (car rest-)))))
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(eq? 'return (tok-n (car rest-)))
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(not converted-sub?)))
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;; no arrays of pointers in this scope, or addresses of
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;; local vars taken in the function.
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(not (or (ormap (lambda (var)
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@ -3316,11 +3332,15 @@
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(+ (if non-returning? 1 0)
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(live-var-info-num-noreturn-calls live-vars))
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(or this-nonempty?
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(live-var-info-nonempty-calls? live-vars)))))))))]
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(live-var-info-nonempty-calls? live-vars)))
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(or converted-sub?
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(null? rest-)
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(not (memq (tok-n (car rest-)) '(return else))))))))))]
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[(eq? 'goto (tok-n (car e-)))
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;; Goto - assume all vars are live
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(loop (cdr e-) (cons (car e-) result)
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(replace-live-vars live-vars vars))]
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(replace-live-vars live-vars vars)
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#t)]
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[(eq? '= (tok-n (car e-)))
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;; Check for assignments where the LHS can move due to
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;; a function call on the RHS. [Note that special support
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@ -3369,7 +3389,8 @@
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(live-var-info-pushed-vars live-vars)
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(live-var-info-num-calls live-vars)
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(live-var-info-num-noreturn-calls live-vars)
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(live-var-info-nonempty-calls? live-vars))))
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(live-var-info-nonempty-calls? live-vars))
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#t))
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(begin
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(when (and (not (null? assignee))
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(or (if (brackets? (car assignee))
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@ -3402,8 +3423,8 @@
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(log-warning "[ASSIGN] ~a in ~a: suspicious assignment with a function call, LHS ends ~s."
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(tok-line (car e-)) (tok-file (car e-))
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(tok-n (cadr e-))))
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(loop (cdr e-) (cons (car e-) result) live-vars)))))
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(loop (cdr e-) (cons (car e-) result) live-vars))]
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(loop (cdr e-) (cons (car e-) result) live-vars #t)))))
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(loop (cdr e-) (cons (car e-) result) live-vars #t))]
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[(and (braces? (car e-)) (not braces-are-aggregates?))
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(let*-values ([(v) (car e-)]
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;; do/while/for: we'll need a fixpoint for live-vars
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@ -3490,7 +3511,8 @@
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(seq-close v)
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(list->seq e)))
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result)
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(filter-live-vars live-vars)))]
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(filter-live-vars live-vars)
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#t))]
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[(seq? (car e-))
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;; Do nested body.
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;; For (v = new x, ...) parens, check for special conversion
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@ -3505,7 +3527,7 @@
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(and (brackets? (car e-))
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"array access"))
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#f)])
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(loop (cdr e-) (cons v result) live-vars)))]
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(loop (cdr e-) (cons v result) live-vars #t)))]
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[(and (assq (tok-n (car e-)) vars)
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(not (assq (tok-n (car e-)) (live-var-info-vars live-vars))))
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;; Add a live variable:
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@ -3513,7 +3535,8 @@
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(cons (car e-) result)
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(replace-live-vars live-vars
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(cons (assq (tok-n (car e-)) vars)
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(live-var-info-vars live-vars))))]
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(live-var-info-vars live-vars)))
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#t)]
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[(and (memq (tok-n (car e-)) '(while do for))
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(case (tok-n (car e-))
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[(do)
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@ -3525,7 +3548,7 @@
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(braces? (cadr result))))]))
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(log-error "[LOOP] ~a in ~a: while/do/for with body not in braces."
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(tok-line (car e-)) (tok-file (car e-)))
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(loop (cdr e-) (cons (car e-) result) live-vars)]
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(loop (cdr e-) (cons (car e-) result) live-vars #t)]
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[else
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(when (and check-arith? (not memcpy?)
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(positive? (live-var-info-num-calls live-vars)))
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@ -3544,7 +3567,7 @@
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(log-warning "[ARITH] ~a in ~a: suspicious arithmetic, LHS ends ~s."
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(tok-line (car e-)) (tok-file (car e-))
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(tok-n (cadr e-))))))
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(loop (cdr e-) (cons (car e-) result) live-vars)]))))
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(loop (cdr e-) (cons (car e-) result) live-vars converted-sub?)]))))
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(define (convert-seq-interior v comma-sep? vars &-vars c++-class live-vars complain-not-in memcpy?)
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(let ([e (seq->list (seq-in v))])
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