52 lines
1.4 KiB
Prolog
52 lines
1.4 KiB
Prolog
% File : hacks.yap
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% Author : Vitor Santos Costa
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% Updated: 2007
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% Purpose: Prolog hacking
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:- module(yap_hacks, [
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current_choicepoint/1,
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cut_by/1,
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cut_at/1,
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current_choicepoints/1,
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choicepoint/7,
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current_continuations/1,
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continuation/4,
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stack_dump/0,
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stack_dump/1,
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enable_interrupts/0,
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disable_interrupts/0,
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virtual_alarm/3
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]).
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stack_dump :-
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stack_dump(-1).
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stack_dump(Max) :-
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current_choicepoints(CPs),
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current_continuations([Env|Envs]),
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continuation(Env,_,ContP,_),
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length(CPs, LCPs),
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length(Envs, LEnvs),
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format(user_error,'~n~n~tStack Dump~t~40+~n~nAddress~tChoiceP~16+ Cur/Next Clause Goal~n',[LCPs,LEnvs]),
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'$hacks':display_stack_info(CPs, Envs, Max, ContP, StackInfo, []),
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run_formats(StackInfo, user_error).
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run_formats([], _).
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run_formats([Com-Args|StackInfo], Stream) :-
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format(Stream, Com, Args),
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run_formats(StackInfo, user_error).
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virtual_alarm(Interval, Goal, Left) :-
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Interval == 0, !,
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virtual_alarm(0, 0, Left0, _),
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on_signal(sig_vtalarm, _, Goal),
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Left = Left0.
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virtual_alarm(Interval, Goal, Left) :-
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integer(Interval), !,
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on_signal(sig_vtalarm, _, Goal),
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virtual_alarm(Interval, 0, Left, _).
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virtual_alarm(Interval.USecs, Goal, Left.LUSecs) :-
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on_signal(sig_vtalarm, _, Goal),
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virtual_alarm(Interval, USecs, Left, LUSecs).
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