1015 lines
30 KiB
Prolog
1015 lines
30 KiB
Prolog
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: debug.pl *
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* Last rev: *
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* mods: *
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* comments: YAP debugger *
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* *
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*************************************************************************/
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:- system_module( '$_debug', [], ['$do_spy'/4,
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'$init_debugger'/0,
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'$skipeol'/1]).
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/** @defgroup Deb_Interaction Interacting with the debugger
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@ingroup YAPProgramming
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Debugging with YAP is similar to debugging with C-Prolog. Both systems
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include a procedural debugger, based on Byrd's four port model. In this
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model, execution is seen at the procedure level: each activation of a
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procedure is seen as a box with control flowing into and out of that
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box.
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In the four port model control is caught at four key points: before
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entering the procedure, after exiting the procedure (meaning successful
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evaluation of all queries activated by the procedure), after backtracking but
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before trying new alternative to the procedure and after failing the
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procedure. Each one of these points is named a port:
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~~~~~
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*--------------------------------------*
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Call | | Exit
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---------> + descendant(X,Y) :- offspring(X,Y). + --------->
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| |
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| descendant(X,Z) :- |
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<--------- + offspring(X,Y), descendant(Y,Z). + <---------
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Fail | | Redo
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*--------------------------------------*
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~~~~~
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+ `Call`
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The call port is activated before initial invocation of
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procedure. Afterwards, execution will try to match the goal with the
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head of existing clauses for the procedure.
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+ `Exit`
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This port is activated if the procedure succeeds.
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Control will now leave the procedure and return to its ancestor.
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+ `Redo`
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If the goal, or goals, activated after the call port
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fail then backtracking will eventually return control to this procedure
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through the redo port.
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+ `Fail`
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If all clauses for this predicate fail, then the
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invocation fails, and control will try to redo the ancestor of this
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invocation.
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To start debugging, the user will either call `trace` or spy the
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relevant procedures, entering debug mode, and start execution of the
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program. When finding the first spy-point, YAP's debugger will take
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control and show a message of the form:
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~~~~~
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* (1) call: quicksort([1,2,3],_38) ?
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~~~~~
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The debugger message will be shown while creeping, or at spy-points,
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and it includes four or five fields:
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+
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The first three characters are used to point out special states of the
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debugger. If the port is exit and the first character is '?', the
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current call is non-deterministic, that is, it still has alternatives to
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be tried. If the second character is a `\*`, execution is at a
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spy-point. If the third character is a `>`, execution has returned
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either from a skip, a fail or a redo command.
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+
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The second field is the activation number, and uniquely identifies the
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activation. The number will start from 1 and will be incremented for
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each activation found by the debugger.
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+
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In the third field, the debugger shows the active port.
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+
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The fourth field is the goal. The goal is written by
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`write_term/3` on the standard error stream, using the options
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given by debugger_print_options.
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If the active port is leashed, the debugger will prompt the user with a
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`?`, and wait for a command. A debugger command is just a
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character, followed by a return. By default, only the call and redo
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entries are leashed, but the leash/1 predicate can be used in
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order to make the debugger stop where needed.
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There are several commands available, but the user only needs to
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remember the help command, which is `h`. This command shows all the
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available options, which are:
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+ `c` - creep
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this command makes YAP continue execution and stop at the next
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leashed port.
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+ `return` - creep
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the same as c
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+ `l` - leap
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YAP will execute until it meets a port for a spied predicate; this mode
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keeps all computation history for debugging purposes, so it is more
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expensive than standard execution. Use <tt>k</tt> or <tt>z</tt> for fast execution.
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+ `k` - quasi-leap
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similar to leap but faster since the computation history is
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not kept; useful when leap becomes too slow.
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+ `z` - zip
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same as <tt>k</tt>
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+ `s` - skip
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YAP will continue execution without showing any messages until
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returning to the current activation. Spy-points will be ignored in this
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mode. Note that this command keeps all debugging history, use <tt>t</tt> for fast execution. This command is meaningless, and therefore illegal, in the fail
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and exit ports.
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+ `t` - fast-skip
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similar to skip but faster since computation history is not
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kept; useful if skip becomes slow.
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+ `f [ _GoalId_]` - fail
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If given no argument, forces YAP to fail the goal, skipping the fail
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port and backtracking to the parent.
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If <tt>f</tt> receives a goal number as
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the argument, the command fails all the way to the goal. If goal _GoalId_ has completed execution, YAP fails until meeting the first active ancestor.
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+ `r` [ _GoalId_] - retry
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This command forces YAP to jump back call to the port. Note that any
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side effects of the goal cannot be undone. This command is not available
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at the call port. If <tt>f</tt> receives a goal number as the argument, the
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command retries goal _GoalId_ instead. If goal _GoalId_ has
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completed execution, YAP fails until meeting the first active ancestor.
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+ `a` - abort
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execution will be aborted, and the interpreter will return to the
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top-level. YAP disactivates debug mode, but spypoints are not removed.
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+ `n` - nodebug
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stop debugging and continue execution. The command will not clear active
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§spy-points.
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+ `e` - exit
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leave YAP.
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+ `h` - help
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show the debugger commands.
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+ `!` Query
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execute a query. YAP will not show the result of the query.
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+ `b` - break
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break active execution and launch a break level. This is the same as `!break`.
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+ `+` - spy this goal
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start spying the active goal. The same as `! spy G` where _G_
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is the active goal.
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+ `-` - nospy this goal
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stop spying the active goal. The same as `! nospy G` where _G_ is
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the active goal.
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+ `p` - print
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shows the active goal using print/1
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+ `d` - display
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shows the active goal using display/1
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+ `<Depth` - debugger write depth
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sets the maximum write depth, both for composite terms and lists, that
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will be used by the debugger. For more
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information about `write_depth/2` ( (see Input/Output Control)).
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+ `<` - full term
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resets to the default of ten the debugger's maximum write depth. For
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more information about `write_depth/2` ( (see Input/Output Control)).
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+ `A` - alternatives
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show the list of backtrack points in the current execution.
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+ `g [ _N_]`
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show the list of ancestors in the current debugging environment. If it
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receives _N_, show the first _N_ ancestors.
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The debugging information, when fast-skip `quasi-leap` is used, will
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be lost.
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*/
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/*-----------------------------------------------------------------------------
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spy
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-----------------------------------------------------------------------------*/
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% ok, I may have a spy point for this goal, or not.
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% if I do, I should check what mode I am in.
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% Goal/Mode Have Spy Not Spied
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% Creep Stop Stop
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% Leap Stop Create CP
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% Skip Create CP Create CP
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% FastLeap Stop Ignore
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% FastIgnore Ignore Ignore
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% flag description initial possible values
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% spy_gn goal number 1 1...
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% spy_trace trace 0 0, 1
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% spy_skip leap off Num (stop level)
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% debug_prompt stop at spy points on on,off
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% a flip-flop is also used
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% when 1 spying is enabled *(the same as spy stop).
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%'$spy'(G) :- write(user_error,'$spy'(G)), nl, fail.
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%
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% handle suspended goals
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% take care with hidden goals.
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%
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% $spy may be called from user code, so be careful.
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'$spy'([Mod|G]) :-
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current_prolog_flag(debug, false), !,
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'$execute_nonstop'(G,Mod).
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'$spy'([Mod|G]) :-
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CP is '$last_choice_pt',
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'$debugger_input',
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'$do_spy'(G, Mod, CP, spy).
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/**
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* @pred debugger_input.
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* name of stream used for debugging,
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* must be always connected to a tty.
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*
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* '$debugger_input': try to connect the debugger to an open terminal.
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*/
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'$debugger_input' :-
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stream_property(_,alias(debugger_input)),
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!.
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'$debugger_input' :-
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stream_property(S,tty(true)),
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stream_property(S,input),
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!,
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set_stream(S,alias(debugger_input)).
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'$debugger_input' :-
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current_prolog_flag(unix, true ), !,
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open('/dev/tty', read, _S, [alias(debugger_input),bom(false)]).
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'$debugger_input' :-
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current_prolog_flag(windows, true ), !,
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open('CONIN$', read, _S, [alias(debugger_input),bom(false)]).
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'$trace_meta_call'( G, M, CP ) :-
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'$do_spy'(G, M, CP, spy ).
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% last argument to do_spy says that we are at the end of a context. It
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% is required to know whether we are controlled by the debugger.
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%'$do_spy'(V, M, CP, Flag) :-
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% writeln('$do_spy'(V, M, CP, Flag)), fail.
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'$do_spy'(V, M, CP, Flag) :-
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var(V), !,
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'$do_spy'(call(V), M, CP, Flag).
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'$do_spy'(!, _, CP, _) :-
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!, '$$cut_by'(CP).
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'$do_spy'('$cut_by'(M), _, _, _) :-
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!, '$$cut_by'(M).
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'$do_spy'(true, _, _, _) :- !.
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%'$do_spy'(fail, _, _, _) :- !, fail.
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'$do_spy'(M:G, _, CP, CalledFromDebugger) :- !,
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'$do_spy'(G, M, CP, CalledFromDebugger).
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'$do_spy'((A,B), M, CP, CalledFromDebugger) :- !,
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'$do_spy'(A, M, CP, debugger),
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'$do_spy'(B, M, CP, CalledFromDebugger).
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'$do_spy'((T->A;B), M, CP, CalledFromDebugger) :- !,
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( '$do_spy'(T, M, CP, debugger) -> '$do_spy'(A, M, CP, CalledFromDebugger)
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;
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'$do_spy'(B, M, CP, CalledFromDebugger)
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).
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'$do_spy'((T->A|B), M, CP, CalledFromDebugger) :- !,
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(
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'$do_spy'(T, M, CP, debugger)
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->
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'$do_spy'(A, M, CP, CalledFromDebugger)
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;
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'$do_spy'(B, M, CP, CalledFromDebugger)
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).
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'$do_spy'((T->A), M, CP, CalledFromDebugger) :- !,
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( '$do_spy'(T, M, CP, debugger) -> '$do_spy'(A, M, CP, CalledFromDebugger) ).
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'$do_spy'((A;B), M, CP, CalledFromDebugger) :- !,
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(
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'$do_spy'(A, M, CP, CalledFromDebugger)
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;
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'$do_spy'(B, M, CP, CalledFromDebugger)
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).
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'$do_spy'((A|B), M, CP, CalledFromDebugger) :- !,
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(
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'$do_spy'(A, M, CP, CalledFromDebugger )
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;
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'$do_spy'(B, M, CP, CalledFromDebugger )
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).
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'$do_spy'((\+G), M, CP, CalledFromDebugger) :- !,
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\+ '$do_spy'(G, M, CP, CalledFromDebugger).
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'$do_spy'((not(G)), M, CP, CalledFromDebugger) :- !,
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\+ '$do_spy'(G, M, CP, CalledFromDebugger).
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'$do_spy'(G, Module, _, CalledFromDebugger) :-
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'__NB_getval__'('$spy_gn',L,fail), /* get goal no. */
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L1 is L+1, /* bump it */
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'__NB_setval__'('$spy_gn',L1), /* and save it globaly */
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'__NB_getval__'('$spy_glist',History,true), /* get goal list */
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'__B_setval__'('$spy_glist',[info(L,Module,G,_Retry,_Det,_HasFoundAnswers)|History]),
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/* and update it */
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'$loop_spy'(L, G, Module, CalledFromDebugger).
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% we are skipping, so we can just call the goal,
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% while leaving the minimal structure in place.
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'$loop_spy'(GoalNumber, G, Module, CalledFromDebugger) :-
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'$current_choice_point'(CP),
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'$system_catch'('$loop_spy2'(GoalNumber, G, Module, CalledFromDebugger, CP),
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Module, error(Event,Context),
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'$loop_spy_event'(error(Event,Context), GoalNumber, G, Module, CalledFromDebugger)).
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% handle weird things happening in the debugger.
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'$loop_spy_event'('$pass'(Event), _, _, _, _) :- !,
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throw(Event).
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'$loop_spy_event'(error('$retry_spy'(G0),_), GoalNumber, G, Module, CalledFromDebugger) :-
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G0 >= GoalNumber, !,
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'$loop_spy'(GoalNumber, G, Module, CalledFromDebugger).
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'$loop_spy_event'(error('$retry_spy'(GoalNumber),_), _, _, _, _) :- !,
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throw(error('$retry_spy'(GoalNumber),[])).
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'$loop_spy_event'(error('$fail_spy'(G0),_), GoalNumber, G, Module, CalledFromDebugger) :-
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G0 >= GoalNumber, !,
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'$loop_fail'(GoalNumber, G, Module, CalledFromDebugger).
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'$loop_spy_event'(error('$fail_spy'(GoalNumber),_), _, _, _, _) :- !,
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throw(error('$fail_spy'(GoalNumber),[])).
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'$loop_spy_event'(error('$done_spy'(G0),_), GoalNumber, _G, _, CalledFromDebugger) :-
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G0 >= GoalNumber, !,
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'$continue_debugging'(zip, CalledFromDebugger).
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'$loop_spy_event'(error('$done_spy'(GoalNumber),_), _, _, _, _) :- !,
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throw(error('$done_spy'(GoalNumber),[])).
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'$loop_spy_event'(Event, GoalNumber, G, Module, CalledFromDebugger) :-
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'$debug_error'(Event),
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'$system_catch'(
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('$trace'(exception(Event),G,Module,GoalNumber,_),fail),
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Module,
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error(NewEvent,NewContext),
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'$loop_spy_event'(error(NewEvent,NewContext), GoalNumber, G, Module, CalledFromDebugger)
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).
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'$debug_error'(Event) :-
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'$Error'(Event), fail.
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'$debug_error'(_).
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% just fail here, don't really need to call debugger, the user knows what he
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% wants to do
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'$loop_fail'(_GoalNumber, _G, _Module, CalledFromDebugger) :-
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'$continue_debugging'(fail, CalledFromDebugger),
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fail.
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% if we are in
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'$loop_spy2'(GoalNumber, G, Module, CalledFromDebugger, CP) :-
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/* the following choice point is where the predicate is called */
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'__NB_getval__'('$spy_glist',[Info|_],true), /* get goal list */
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Info = info(_,_,_,Retry,Det,false),
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(
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/* call port */
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'$enter_goal'(GoalNumber, G, Module),
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'$spycall'(G, Module, CalledFromDebugger, Retry),
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'$stop_creeping',
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% make sure we are in system mode when running the debugger.
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(
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'$debugger_deterministic_goal'(G) ->
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Det=true
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;
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Det=false
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),
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/* go execute the continuation */
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(
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/* exit port */
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Retry = false,
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/* found an answer, so it can redo */
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nb_setarg(6, Info, true),
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'$show_trace'(exit,G,Module,GoalNumber,Det), /* output message at exit */
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/* exit port */
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/* get rid of deterministic computations */
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(
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Det == true
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->
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'$$cut_by'(CP)
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;
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true
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),
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'$continue_debugging'(exit, CalledFromDebugger)
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;
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% make sure we are in system mode when running the debugger.
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/* backtracking from exit */
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/* we get here when we want to redo a goal */
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/* redo port */
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(
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arg(6, Info, true)
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->
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'$stop_creeping',
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'$show_trace'(redo,G,Module,GoalNumber,_), /* inform user_error */
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nb_setarg(6, Info, false)
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;
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true
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),
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'$continue_debugging'(fail, CalledFromDebugger),
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fail /* to backtrack to spycalls */
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)
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;
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'$stop_creeping',
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'$show_trace'(fail,G,Module,GoalNumber,_), /* inform at fail port */
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'$continue_debugging'(fail, CalledFromDebugger),
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/* fail port */
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fail
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).
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'$enter_goal'(GoalNumber, G, Module) :-
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'$zip'(GoalNumber, G, Module), !.
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'$enter_goal'(GoalNumber, G, Module) :-
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'$trace'(call, G, Module, GoalNumber, _).
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'$show_trace'(_, G, Module, GoalNumber,_) :-
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'$zip'(GoalNumber, G, Module), !.
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'$show_trace'(P,G,Module,GoalNumber,Deterministic) :-
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'$trace'(P,G,Module,GoalNumber,Deterministic).
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%
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% skip a goal or a port
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%
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'$zip'(GoalNumber, G, Module) :-
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'__NB_getval__'('$debug_run',StopPoint,fail),
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% zip mode off, we cannot zip
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StopPoint \= off,
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(
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% skip spy points (eg, s).
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StopPoint == spy
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->
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\+ '$pred_being_spied'(G, Module)
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;
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% skip goals (eg, l).
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number(StopPoint)
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->
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StopPoint < GoalNumber
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).
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%
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'$spycall'(G, M, _, _) :-
|
|
'__NB_getval__'('$debug_jump',true, fail),
|
|
!,
|
|
( '$is_metapredicate'(G, M)
|
|
->
|
|
'$meta_expansion'(G,M,M,M,G1,[])
|
|
;
|
|
G = G1
|
|
),
|
|
'$execute_nonstop'(G1,M).
|
|
'$spycall'(G, M, _, _) :-
|
|
(
|
|
'$system_predicate'(G,M)
|
|
;
|
|
'$system_module'(M)
|
|
),
|
|
!,
|
|
( '$is_metapredicate'(G, M)
|
|
->
|
|
'$meta_expansion'(G,M,M,M,G10,[]),
|
|
'$debugger_process_meta_arguments'(G10, M, G1),
|
|
'$execute'(M:G1)
|
|
;
|
|
'$execute'(M:G)
|
|
).
|
|
'$spycall'(G, M, _, _) :-
|
|
'$tabled_predicate'(G,M),
|
|
!,
|
|
'$continue_debugging_goal'(no, '$execute_nonstop'(G,M)).
|
|
'$spycall'(G, M, CalledFromDebugger, InRedo) :-
|
|
'$is_metapredicate'(G, M), !,
|
|
'$meta_expansion'(G,M,M,M,G1,[]),
|
|
'$spycall_expanded'(G1, M, CalledFromDebugger, InRedo).
|
|
'$spycall'(G, M, CalledFromDebugger, InRedo) :-
|
|
'$spycall_expanded'(G, M, CalledFromDebugger, InRedo).
|
|
|
|
'$spycall_expanded'(G, M, _CalledFromDebugger, InRedo) :-
|
|
'$predicate_flags'(G,M,F,F),
|
|
F /\ 0x08402000 =\= 0, !, % dynamic procedure, logical semantics, or source
|
|
% use the interpreter
|
|
CP is '$last_choice_pt',
|
|
'$clause'(G, M, Cl, _),
|
|
% I may backtrack to here from far away
|
|
( '$do_spy'(Cl, M, CP, debugger) ; InRedo = true ).
|
|
'$spycall_expanded'(G, M, CalledFromDebugger, InRedo) :-
|
|
'$undefined'(G, M), !,
|
|
'$get_undefined_pred'(G, M, Goal, NM), NM \= M,
|
|
'$spycall'(Goal, NM, CalledFromDebugger, InRedo).
|
|
'$spycall_expanded'(G, M, _, InRedo) :-
|
|
% I lost control here.
|
|
CP is '$last_choice_pt',
|
|
'$static_clause'(G,M,_,R),
|
|
'$stop_creeping',
|
|
% I may backtrack to here from far away
|
|
(
|
|
'$continue_debugging_goal'(no, '$execute_clause'(G, M, R, CP))
|
|
;
|
|
InRedo = true
|
|
).
|
|
|
|
%
|
|
%
|
|
'$creep'('$execute_clause'(G,Mod,Ref,CP),_M) :-
|
|
(
|
|
'$$save_by'(CP1),
|
|
'$creep',
|
|
'$execute_clause'(G,Mod,Ref,CP),
|
|
'$$save_by'(CP2),
|
|
(CP1 == CP2 -> ! ; ( true ; '$creep', fail ) ),
|
|
'$stop_creeping'
|
|
;
|
|
fail
|
|
).
|
|
'$creep'(G,M) :-
|
|
(
|
|
'$$save_by'(CP1),
|
|
'$creep',
|
|
'$execute_nonstop'(G,M),
|
|
'$$save_by'(CP2),
|
|
(CP1 == CP2 -> ! ; ( true ; '$creep', fail ) ),
|
|
'$stop_creeping'
|
|
;
|
|
fail
|
|
).
|
|
|
|
'$trace'(G,M) :-
|
|
(
|
|
'$$save_by'(CP1),
|
|
'$creep',
|
|
'$execute0'( G, M ),
|
|
'$$save_by'(CP2),
|
|
(CP1 == CP2 -> ! ; ( true ; '$creep', fail ) ),
|
|
'$stop_creeping'
|
|
;
|
|
fail
|
|
).
|
|
|
|
'$tabled_predicate'(G,M) :-
|
|
'$predicate_flags'(G,M,F,F),
|
|
F /\ 0x00000040 =\= 0.
|
|
|
|
%'$trace'(P,G,Module,L,Deterministic) :-
|
|
% '__NB_getval__'('$system_mode',On,fail), writeln(On), fail.
|
|
'$trace'(P,G,Module,L,Deterministic) :-
|
|
% at this point we are done with leap or skip
|
|
'__NB_setval__'('$debug_run',off),
|
|
% but creep is default
|
|
'__NB_setval__'('$trace',on),
|
|
% make sure we run this code outside debugging mode.
|
|
set_prolog_flag(debug, false),
|
|
repeat,
|
|
'$trace_msg'(P,G,Module,L,Deterministic),
|
|
(
|
|
'$unleashed'(P) ->
|
|
'$action'(10,P,L,G,Module,Debug),
|
|
put_code(user_error, 10)
|
|
;
|
|
write(user_error,' ? '), get_code(debugger_input,C),
|
|
'$action'(C,P,L,G,Module,Debug)
|
|
),
|
|
(Debug = on
|
|
->
|
|
set_prolog_flag(debug, true)
|
|
;
|
|
Debug = zip
|
|
->
|
|
set_prolog_flag(debug, true)
|
|
;
|
|
set_prolog_flag(debug, false)
|
|
),
|
|
!.
|
|
|
|
'$trace_msg'(P,G,Module,L,Deterministic) :-
|
|
flush_output(user_output),
|
|
flush_output(user_error),
|
|
functor(P,P0,_),
|
|
(P = exit, Deterministic \= true -> Det = '?' ; Det = ' '),
|
|
('$pred_being_spied'(G,Module) -> CSPY = '*' ; CSPY = ' '),
|
|
% vsc: fix this
|
|
% ( SL = L -> SLL = '>' ; SLL = ' '),
|
|
SLL = ' ',
|
|
( Module\=prolog,
|
|
Module\=user
|
|
->
|
|
GW = Module:G
|
|
;
|
|
GW = G
|
|
),
|
|
format(user_error,'~a~a~a (~d) ~q:',[Det,CSPY,SLL,L,P0]),
|
|
'$debugger_write'(user_error,GW).
|
|
|
|
'$unleashed'(call) :- get_value('$leash',L), L /\ 2'1000 =:= 0. %'
|
|
'$unleashed'(exit) :- get_value('$leash',L), L /\ 2'0100 =:= 0. %'
|
|
'$unleashed'(redo) :- get_value('$leash',L), L /\ 2'0010 =:= 0. %'
|
|
'$unleashed'(fail) :- get_value('$leash',L), L /\ 2'0001 =:= 0. %'
|
|
% the same as fail.
|
|
'$unleashed'(exception(_)) :- get_value('$leash',L), L /\ 2'0001 =:= 0. %'
|
|
|
|
'$debugger_write'(Stream, G) :-
|
|
current_prolog_flag( debugger_print_options, OUT ), !,
|
|
write_term(Stream, G, OUT).
|
|
'$debugger_write'(Stream, G) :-
|
|
writeq(Stream, G).
|
|
|
|
'$action'(13,P,CallNumber,G,Module,Zip) :- !, % newline creep
|
|
get_code( debugger_input,C),
|
|
'$action'(C,P,CallNumber,G,Module,Zip).
|
|
'$action'(10,_,_,_,_,on) :- !, % newline creep
|
|
'__NB_setval__'('$debug_jump',false).
|
|
'$action'(0'!,_,_,_,_,_) :- !, % ! 'g execute
|
|
read(debugger_input, G),
|
|
% don't allow yourself to be caught by creep.
|
|
current_prolog_flag(debug, OldDeb),
|
|
set_prolog_flag(debug, false),
|
|
( '$execute'(G) -> true ; true),
|
|
% at this point we are done with leap or skip
|
|
'__NB_setval__'('$debug_run',off),
|
|
% but creep is default
|
|
'__NB_setval__'('$trace',on),
|
|
set_prolog_flag(debug, OldDeb),
|
|
% '$skipeol'(0'!), % '
|
|
fail.
|
|
'$action'(0'<,_,_,_,_,_) :- !, % <'Depth
|
|
'$new_deb_depth',
|
|
'$skipeol'(0'<),
|
|
fail.
|
|
'$action'(0'^,_,_,G,_,_) :- !, % '
|
|
'$print_deb_sterm'(G),
|
|
'$skipeol'(0'^),
|
|
fail.
|
|
'$action'(0'a,_,_,_,_,off) :- !, % 'a abort
|
|
'$skipeol'(0'a),
|
|
abort.
|
|
'$action'(0'b,_,_,_,_,_) :- !, % 'b break
|
|
'$skipeol'(0'b),
|
|
break,
|
|
fail.
|
|
'$action'(0'A,_,_,_,_,_) :- !, % 'b break
|
|
'$skipeol'(0'A),
|
|
'$hacks':'$stack_dump',
|
|
fail.
|
|
'$action'(0'c,_,_,_,_,on) :- !, % 'c creep
|
|
'$skipeol'(0'c),
|
|
'__NB_setval__'('$debug_jump',false).
|
|
'$action'(0'e,_,_,_,_,_) :- !, % 'e exit
|
|
'$skipeol'(0'e),
|
|
halt.
|
|
'$action'(0'f,_,CallId,_,_,_) :- !, % 'f fail
|
|
'$scan_number'(0'f, CallId, GoalId), %'f
|
|
throw(error('$fail_spy'(GoalId),[])).
|
|
'$action'(0'h,_,_,_,_,_) :- !, % 'h help
|
|
'$action_help',
|
|
'$skipeol'(104),
|
|
fail.
|
|
'$action'(0'?,_,_,_,_,_) :- !, % '? help
|
|
'$action_help',
|
|
'$skipeol'(104),
|
|
fail.
|
|
'$action'(0'p,_,_,G,Module,_) :- !, % 'p print
|
|
((Module = prolog ; Module = user) ->
|
|
print(user_error,G), nl(user_error)
|
|
;
|
|
print(user_error,Module:G), nl(user_error)
|
|
),
|
|
'$skipeol'(0'p),
|
|
fail.
|
|
'$action'(0'd,_,_,G,Module,_) :- !, % 'd display
|
|
((Module = prolog ; Module = user) ->
|
|
display(user_error,G), nl(user_error)
|
|
;
|
|
display(user_error,Module:G), nl(user_error)
|
|
),
|
|
'$skipeol'(0'd),
|
|
fail.
|
|
'$action'(0'l,_,_,_,_,on) :- !, % 'l leap
|
|
'$skipeol'(0'l),
|
|
'__NB_setval__'('$debug_run',spy),
|
|
'__NB_setval__'('$debug_jump',false).
|
|
'$action'(0'z,_,_,_,_,zip) :- !, % 'z zip, fast leap
|
|
'$skipeol'(0'z), % 'z
|
|
'__NB_setval__'('$debug_run',spy),
|
|
'__NB_setval__'('$debug_jump',true).
|
|
% skip first call (for current goal),
|
|
% stop next time.
|
|
'$action'(0'k,_,_,_,_,zip) :- !, % 'k zip, fast leap
|
|
'$skipeol'(0'k), % '
|
|
'__NB_setval__'('$debug_run',spy),
|
|
'__NB_setval__'('$debug_jump',true).
|
|
% skip first call (for current goal),
|
|
% stop next time.
|
|
'$action'(0'n,_,_,_,_,off) :- !, % 'n nodebug
|
|
'$skipeol'(0'n), % '
|
|
% tell debugger never to stop.
|
|
'__NB_setval__'('$debug_run', -1),
|
|
'__NB_setval__'('$debug_jump',true),
|
|
nodebug.
|
|
'$action'(0'r,_,CallId,_,_,_) :- !, % 'r retry
|
|
'$scan_number'(0'r,CallId,ScanNumber), % '
|
|
set_prolog_flag(debug, true),
|
|
throw(error('$retry_spy'(ScanNumber),[])).
|
|
'$action'(0's,P,CallNumber,_,_,on) :- !, % 's skip
|
|
'$skipeol'(0's), % '
|
|
( (P=call; P=redo) ->
|
|
'__NB_setval__'('$debug_run',CallNumber),
|
|
'__NB_setval__'('$debug_jump',false)
|
|
;
|
|
'$ilgl'(0's) % '
|
|
).
|
|
'$action'(0't,P,CallNumber,_,_,zip) :- !, % 't fast skip
|
|
'$skipeol'(0't), % '
|
|
( (P=call; P=redo) ->
|
|
'__NB_setval__'('$debug_run',CallNumber),
|
|
'__NB_setval__'('$debug_jump',true)
|
|
;
|
|
'$ilgl'(0't) % '
|
|
).
|
|
'$action'(0'+,_,_,G,M,_) :- !, % '+ spy this
|
|
functor(G,F,N), spy(M:(F/N)),
|
|
'$skipeol'(0'+), % '
|
|
fail.
|
|
'$action'(0'-,_,_,G,M,_) :- !, % '- nospy this
|
|
functor(G,F,N), nospy(M:(F/N)),
|
|
'$skipeol'(0'-), % '
|
|
fail.
|
|
'$action'(0'g,_,_,_,_,_) :- !, % 'g ancestors
|
|
'$scan_number'(0'g,-1,HowMany), % '
|
|
'$show_ancestors'(HowMany),
|
|
fail.
|
|
'$action'(C,_,_,_,_,_) :-
|
|
'$skipeol'(C),
|
|
'$ilgl'(C),
|
|
fail.
|
|
|
|
% first argument is exit, zip or fail
|
|
% second is creep, meta_creep, spy, or debugger
|
|
%'$continue_debugging'(Exit, Debugger) :-
|
|
% writeln('$continue_debugging'(Exit, Debugger)), fail.
|
|
% that's what follows
|
|
'$continue_debugging'(_, debugger) :- !.
|
|
% do not need to debug!
|
|
% go back to original sequence.
|
|
'$continue_debugging'(zip, _) :- !.
|
|
'$continue_debugging'(_, creep) :- !,
|
|
'$creep'.
|
|
'$continue_debugging'(fail, _) :- !.
|
|
'$continue_debugging'(_, _).
|
|
|
|
% if we are in the interpreter, don't need to care about forcing a trace, do we?
|
|
'$continue_debugging_goal'(yes,G) :- !,
|
|
'$execute_dgoal'(G).
|
|
% do not need to debug!
|
|
'$continue_debugging_goal'(_,G) :-
|
|
'__NB_getval__'('$debug_run',Zip, fail),
|
|
(Zip == nodebug ; number(Zip) ; Zip == spy ), !,
|
|
'$execute_dgoal'(G).
|
|
'$continue_debugging_goal'(_,G) :-
|
|
'$execute_creep_dgoal'(G).
|
|
|
|
'$execute_dgoal'('$execute_nonstop'(G,M)) :-
|
|
'$execute_nonstop'(G,M).
|
|
'$execute_dgoal'('$execute_clause'(G, M, R, CP)) :-
|
|
'$execute_clause'(G, M, R, CP).
|
|
|
|
'$execute_creep_dgoal'('$execute_nonstop'(G,M)) :-
|
|
'$creep',
|
|
'$execute_nonstop'(G,M).
|
|
'$execute_creep_dgoal'('$execute_clause'(G, M, R, CP)) :-
|
|
'$creep',
|
|
'$execute_clause'(G, M, R, CP).
|
|
|
|
'$show_ancestors'(HowMany) :-
|
|
'__NB_getval__'('$spy_glist',[_|History]),
|
|
(
|
|
History == []
|
|
->
|
|
print_message(help, ancestors([]))
|
|
;
|
|
'$show_ancestors'(History,HowMany),
|
|
nl(user_error)
|
|
).
|
|
|
|
'$show_ancestors'([],_).
|
|
'$show_ancestors'([_|_],0) :- !.
|
|
'$show_ancestors'([info(L,M,G,Retry,Det,_Exited)|History],HowMany) :-
|
|
'$show_ancestor'(L,M,G,Retry,Det,HowMany,HowMany1),
|
|
'$show_ancestors'(History,HowMany1).
|
|
|
|
% skip exit port, we're looking at true ancestors
|
|
'$show_ancestor'(_,_,_,_,Det,HowMany,HowMany) :-
|
|
nonvar(Det), !.
|
|
% look at retry
|
|
'$show_ancestor'(GoalNumber, M, G, Retry, _, HowMany, HowMany1) :-
|
|
nonvar(Retry), !,
|
|
HowMany1 is HowMany-1,
|
|
'$trace_msg'(redo, G, M, GoalNumber, _), nl(user_error).
|
|
'$show_ancestor'(GoalNumber, M, G, _, _, HowMany, HowMany1) :-
|
|
HowMany1 is HowMany-1,
|
|
'$trace_msg'(call, G, M, GoalNumber, _), nl(user_error).
|
|
|
|
|
|
'$action_help' :-
|
|
format(user_error,'newline creep a abort~n', []),
|
|
format(user_error,'c creep e exit~n', []),
|
|
format(user_error,'f Goal fail h help~n', []),
|
|
format(user_error,'l leap r Goal retry~n', []),
|
|
format(user_error,'s skip t fastskip~n', []),
|
|
format(user_error,'q quasiskip k quasileap~n', []),
|
|
format(user_error,'b break n no debug~n', []),
|
|
format(user_error,'p print d display~n', []),
|
|
format(user_error,'<D depth D < full term~n', []),
|
|
format(user_error,'+ spy this - nospy this~n', []),
|
|
format(user_error,'^ view subg ^^ view using~n', []),
|
|
format(user_error,'A choices g [N] ancestors~n', []),
|
|
format(user_error,'! g execute goal~n', []).
|
|
|
|
'$ilgl'(C) :-
|
|
print_message(warning, trace_command(C)),
|
|
print_message(help, trace_help),
|
|
fail.
|
|
|
|
'$skipeol'(10) :- !.
|
|
'$skipeol'(_) :- get_code( debugger_input,C), '$skipeol'(C).
|
|
|
|
'$scan_number'(_, _, Nb) :-
|
|
get_code( debugger_input,C),
|
|
'$scan_number2'(C, Nb), !.
|
|
'$scan_number'(_, CallId, CallId).
|
|
|
|
'$scan_number2'(10, _) :- !, fail.
|
|
'$scan_number2'(0' , Nb) :- !, % '
|
|
get_code( debugger_input,C),
|
|
'$scan_number2'(C , Nb).
|
|
'$scan_number2'(0' , Nb) :- !, %'
|
|
get_code( debugger_input,C),
|
|
'$scan_number2'(C, Nb).
|
|
'$scan_number2'(C, Nb) :-
|
|
'$scan_number3'(C, 0, Nb).
|
|
|
|
'$scan_number3'(10, Nb, Nb) :- !, Nb > 0.
|
|
'$scan_number3'( C, Nb0, Nb) :-
|
|
C >= "0", C =< "9",
|
|
NbI is Nb0*10+(C-"0"),
|
|
get_code( debugger_input, NC),
|
|
'$scan_number3'( NC, NbI, Nb).
|
|
|
|
'$print_deb_sterm'(G) :-
|
|
'$get_sterm_list'(L), !,
|
|
'$deb_get_sterm_in_g'(L,G,A),
|
|
recorda('$debug_sub_skel',L,_),
|
|
format(user_error,'~n~w~n~n',[A]).
|
|
'$print_deb_sterm'(_) :- '$skipeol'(94).
|
|
|
|
'$get_sterm_list'(L) :-
|
|
get_code( debugger_input_input,C),
|
|
'$deb_inc_in_sterm_oldie'(C,L0,CN),
|
|
'$get_sterm_list'(L0,CN,0,L).
|
|
|
|
'$deb_inc_in_sterm_oldie'(94,L0,CN) :- !,
|
|
get_code( debugger_input,CN),
|
|
( recorded('$debug_sub_skel',L0,_) -> true ;
|
|
CN = [] ).
|
|
'$deb_inc_in_sterm_oldie'(C,[],C).
|
|
|
|
'$get_sterm_list'(L0,C,N,L) :-
|
|
( C =:= "^", N =\= 0 -> get_code(debugger_input, CN),
|
|
'$get_sterm_list'([N|L0],CN,0,L) ;
|
|
C >= "0", C =< "9" -> NN is 10*N+C-"0", get_code(debugger_input, CN),
|
|
'$get_sterm_list'(L0,CN,NN,L);
|
|
C =:= 10 -> (N =:= 0 -> L = L0 ; L=[N|L0]) ).
|
|
|
|
'$deb_get_sterm_in_g'([],G,G).
|
|
'$deb_get_sterm_in_g'([H|T],G,A) :-
|
|
'$deb_get_sterm_in_g'(T,G,A1),
|
|
arg(H,A1,A).
|
|
|
|
'$new_deb_depth' :-
|
|
get_code( debugger_input,C),
|
|
'$get_deb_depth'(C,D),
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'$set_deb_depth'(D).
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|
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'$get_deb_depth'(10,10) :- !. % default depth is 0
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'$get_deb_depth'(C,XF) :-
|
|
'$get_deb_depth_char_by_char'(C,0,XF).
|
|
|
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'$get_deb_depth_char_by_char'(10,X,X) :- !.
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|
'$get_deb_depth_char_by_char'(C,X0,XF) :-
|
|
C >= "0", C =< "9", !,
|
|
XI is X0*10+C-"0",
|
|
get_code( debugger_input,NC),
|
|
'$get_deb_depth_char_by_char'(NC,XI,XF).
|
|
% reset when given garbage.
|
|
'$get_deb_depth_char_by_char'(C,_,10) :- '$skipeol'(C).
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|
|
|
'$set_deb_depth'(D) :-
|
|
recorded('$print_options','$debugger'(L),R), !,
|
|
'$delete_if_there'(L, max_depth(_), LN),
|
|
erase(R),
|
|
recorda('$print_options','$debugger'([max_depth(D)|LN]),_).
|
|
'$set_deb_depth'(D) :-
|
|
recorda('$print_options','$debugger'([quoted(true),numbervars(true),portrayed(true),max_depth(D)]),_).
|
|
|
|
'$delete_if_there'([], _, []).
|
|
'$delete_if_there'([T|L], T, LN) :- !,
|
|
'$delete_if_there'(L, T, LN).
|
|
'$delete_if_there'([Q|L], T, [Q|LN]) :-
|
|
'$delete_if_there'(L, T, LN).
|
|
|
|
'$debugger_deterministic_goal'(G) :-
|
|
yap_hacks:current_choicepoints(CPs0),
|
|
% $cps(CPs0),
|
|
'$debugger_skip_traces'(CPs0,CPs1),
|
|
'$debugger_skip_loop_spy2'(CPs1,CPs2),
|
|
'$debugger_skip_spycall'(CPs2,CPs3),
|
|
'$debugger_skip_loop_spy2'(CPs3,[Catch|_]),
|
|
yap_hacks:choicepoint(Catch,_,prolog,'$catch',3,'$catch'(_,'$loop_spy_event'(_,_,G,_,_),_),_).
|
|
|
|
|
|
'$cps'([CP|CPs]) :-
|
|
yap_hacks:choicepoint(CP,A,B,C,D,E,F),
|
|
write(A:B:C:D:E:F),nl,
|
|
'$cps'(CPs).
|
|
'$cps'([]).
|
|
|
|
|
|
'$debugger_skip_spycall'([CP|CPs],CPs1) :-
|
|
yap_hacks:choicepoint(CP,_,prolog,'$spycall',4,(_;_),_), !,
|
|
'$debugger_skip_spycall'(CPs,CPs1).
|
|
'$debugger_skip_spycall'(CPs,CPs).
|
|
|
|
'$debugger_skip_traces'([CP|CPs],CPs1) :-
|
|
yap_hacks:choicepoint(CP,_,prolog,'$trace',4,(_;_),_), !,
|
|
'$debugger_skip_traces'(CPs,CPs1).
|
|
'$debugger_skip_traces'(CPs,CPs).
|
|
|
|
'$debugger_skip_loop_spy2'([CP|CPs],CPs1) :-
|
|
yap_hacks:choicepoint(CP,_,prolog,'$loop_spy2',5,(_;_),_), !,
|
|
'$debugger_skip_loop_spy2'(CPs,CPs1).
|
|
'$debugger_skip_loop_spy2'(CPs,CPs).
|
|
|
|
'$debugger_process_meta_arguments'(G, M, G1) :-
|
|
functor(G,F,N),
|
|
'$meta_predicate'(F,M,N,D), !, % we're in an argument
|
|
D =.. [F|BMs],
|
|
G =.. [F|BGs],
|
|
'$ldebugger_process_meta_args'(BGs, M, BMs, BG1s),
|
|
G1 =.. [F|BG1s].
|
|
|
|
'$ldebugger_process_meta_args'([], _, [], []).
|
|
'$ldebugger_process_meta_args'([G|BGs], M, [0|BMs], ['$trace'(G1,M1)|BG1s]) :-
|
|
!,
|
|
strip_module( M:G, M1, G1 ),
|
|
'$ldebugger_process_meta_args'(BGs, M, BMs, BG1s).
|
|
'$ldebugger_process_meta_args'([G|BGs], M, [_|BMs], [G|BG1s]) :-
|
|
'$ldebugger_process_meta_args'(BGs, M, BMs, BG1s).
|