allow conditional compilation
git-svn-id: https://yap.svn.sf.net/svnroot/yap/trunk@1965 b08c6af1-5177-4d33-ba66-4b1c6b8b522a
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@ -3492,10 +3492,6 @@ compaction_phase(tr_fr_ptr old_TR, CELL *current_env, yamop *curp, CELL *max)
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total_marked += total_oldies;
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}
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} else {
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if (GcCalls==355) {
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fprintf(stderr,"Start=%p,%pn %ld, %ld\n",H0,HGEN, total_oldies, total_marked);
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}
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if (HGEN != H0) {
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CurrentH0 = H0;
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H0 = HGEN;
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@ -17,6 +17,7 @@
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<h2>Yap-5.1.3:</h2>
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<ul>
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<li> NEW: support conditional compilation using if/1,elif/1,else/0,endif/0 directives.</li>
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<li> FIXED: delay abort until garbage collection or stack shifting is over.</li>
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<li> FIXED: grow_trail assumed SREG points to stack top!</li>
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<li> FIXED: latest SWI chr.</li>
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84
docs/yap.tex
84
docs/yap.tex
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@ -160,6 +160,7 @@ Subnodes of Encoding
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Subnodes of Loading Programs
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* Compiling:: Program Loading and Updating
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* Setting the Compiler:: Changing the compiler's parameters
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* Conditional Compilation:: Compiling program fragments
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* Saving:: Saving and Restoring Programs
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Subnodes of Modules
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@ -1535,6 +1536,7 @@ writing, writing a BOM can be requested using the option
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Loading Programs
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* Compiling:: Program Loading and Updating
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* Setting the Compiler:: Changing the compiler's parameters
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* Conditional Compilation:: Compiling program fragments
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* Saving:: Saving and Restoring Programs
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@end menu
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@ -1616,7 +1618,7 @@ files specified by @var{F} into the file being currently consulted.
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@end table
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@node Setting the Compiler, Saving, Compiling, Loading Programs
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@node Setting the Compiler, Conditional Compilation, Compiling, Loading Programs
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@section Changing the Compiler's Behavior
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This section presents a set of built-ins predicates designed to set the
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@ -1869,7 +1871,85 @@ Since YAP4.3.0 multifile procedures can be static or dynamic.
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@end table
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@node Saving, , Setting the Compiler, Loading Programs
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@node Conditional Compilation, Saving, Setting the Compiler, Loading Programs
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@section Conditional Compilation
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@c \index{if, directive}%
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Conditional compilation builds on the same principle as
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@code{term_expansion/2}, @code{goal_expansion/2} and the expansion of
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grammar rules to compile sections of the source-code
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conditionally. One of the reasons for introducing conditional
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compilation is to simplify writing portable code.
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@c See \secref{dialect}
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@c for more information. Here is a simple example:
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@c @table code
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@c :- if(\+source_exports(library(lists), suffix/2)).
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@c suffix(Suffix, List) :-
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@c append(_, Suffix, List).
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@c :- endif.
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@c \end{code}
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Note that these directives can only be appear as separate terms in the
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input. Typical usage scenarios include:
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@itemize @bullet
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@item Load different libraries on different dialects
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@item Define a predicate if it is missing as a system predicate
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@item Realise totally different implementations for a particular
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part of the code due to different capabilities.
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@item Realise different configuration options for your software.
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@end itemize
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@table @code
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@item if(+@var{Goal})
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@findex if/1 directive
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@snindex if/1
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@cnindex if/1
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Compile subsequent code only if @var{Goal} succeeds. For enhanced
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portability, @var{Goal} is processed by @code{expand_goal/2} before execution.
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If an error occurs, the error is printed and processing proceeds as if
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@var{Goal} has failed.
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@item else
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@findex else/0 directive
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@snindex else/0
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@cnindex else/0
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Start `else' branch.
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@item endif
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@findex endif/0 directive
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@snindex endif/0
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@cnindex endif/0
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End of conditional compilation.
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@item elif(+@var{Goal})
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@findex elif/1 directive
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@snindex elif/1
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@cnindex elif/1
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Equivalent to @code{:- else. :-if(Goal) ... :- endif.} In a sequence
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as below, the section below the first matching elif is processed, If
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no test succeeds the else branch is processed.
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@example
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:- if(test1).
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section_1.
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:- elif(test2).
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section_2.
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:- elif(test3).
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section_3.
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:- else.
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section_else.
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:- endif.
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@end example
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@end table
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@node Saving, , Conditional Compilation, Loading Programs
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@section Saving and Loading Prolog States
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@table @code
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256
pl/boot.yap
256
pl/boot.yap
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@ -56,6 +56,8 @@ true :- true.
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('$exit_undefp' -> true ; true),
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prompt(' ?- '),
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nb_setval('$break',0),
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nb_setval('$if_level',0),
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nb_setval('$endif',off),
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% '$set_read_error_handler'(error), let the user do that
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nb_setval('$debug',off),
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nb_setval('$trace',off),
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@ -80,121 +82,121 @@ true :- true.
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'$startup_reconsult',
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'$startup_goals'.
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% Start file for yap
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% Start file for yap
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/* I/O predicates */
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/* I/O predicates */
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/* meaning of flags for '$write' is
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/* meaning of flags for '$write' is
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1 quote illegal atoms
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2 ignore operator declarations
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4 output '$VAR'(N) terms as A, B, C, ...
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8 use portray(_)
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*/
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*/
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/* main execution loop */
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'$read_vars'(Stream,T,Mod,Pos,V) :-
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'$read'(true,T,Mod,V,Pos,Err,Stream),
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(nonvar(Err) ->
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'$print_message'(error,Err), fail
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;
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true
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).
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/* main execution loop */
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'$read_vars'(Stream,T,Mod,Pos,V) :-
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'$read'(true,T,Mod,V,Pos,Err,Stream),
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(nonvar(Err) ->
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'$print_message'(error,Err), fail
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;
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true
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).
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% reset alarms when entering top-level.
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'$enter_top_level' :-
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'$alarm'(0, 0, _, _),
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fail.
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'$enter_top_level' :-
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'$clean_up_dead_clauses',
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fail.
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'$enter_top_level' :-
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recorded('$restore_goal',G,R),
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erase(R),
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prompt(_,' | '),
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'$system_catch'('$do_yes_no'((G->true),user),user,Error,user:'$Error'(Error)),
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fail.
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'$enter_top_level' :-
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nb_getval('$break',BreakLevel),
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(
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nb_getval('$trace',on)
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->
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TraceDebug = trace
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;
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nb_getval('$debug', on)
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->
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TraceDebug = debug
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;
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true
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),
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'$print_message'(informational,prompt(BreakLevel,TraceDebug)),
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fail.
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'$enter_top_level' :-
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get_value('$top_level_goal',GA), GA \= [], !,
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set_value('$top_level_goal',[]),
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'$run_atom_goal'(GA),
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set_value('$live','$false').
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'$enter_top_level' :-
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prompt(_,' ?- '),
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prompt(' | '),
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'$run_toplevel_hooks',
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'$read_vars'(user_input,Command,_,_,Varnames),
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nb_setval('$spy_gn',1),
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% stop at spy-points if debugging is on.
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nb_setval('$debug_run',off),
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nb_setval('$debug_zip',off),
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prompt(_,' |: '),
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'$command'((?-Command),Varnames,top),
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'$sync_mmapped_arrays',
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set_value('$live','$false').
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% reset alarms when entering top-level.
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'$enter_top_level' :-
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'$alarm'(0, 0, _, _),
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fail.
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'$enter_top_level' :-
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'$clean_up_dead_clauses',
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fail.
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'$enter_top_level' :-
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recorded('$restore_goal',G,R),
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erase(R),
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prompt(_,' | '),
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'$system_catch'('$do_yes_no'((G->true),user),user,Error,user:'$Error'(Error)),
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fail.
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'$enter_top_level' :-
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nb_getval('$break',BreakLevel),
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(
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nb_getval('$trace',on)
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->
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TraceDebug = trace
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;
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nb_getval('$debug', on)
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->
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TraceDebug = debug
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;
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true
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),
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'$print_message'(informational,prompt(BreakLevel,TraceDebug)),
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fail.
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'$enter_top_level' :-
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get_value('$top_level_goal',GA), GA \= [], !,
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set_value('$top_level_goal',[]),
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'$run_atom_goal'(GA),
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set_value('$live','$false').
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'$enter_top_level' :-
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prompt(_,' ?- '),
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prompt(' | '),
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'$run_toplevel_hooks',
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'$read_vars'(user_input,Command,_,_,Varnames),
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nb_setval('$spy_gn',1),
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% stop at spy-points if debugging is on.
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nb_setval('$debug_run',off),
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nb_setval('$debug_zip',off),
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prompt(_,' |: '),
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'$command'((?-Command),Varnames,top),
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'$sync_mmapped_arrays',
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set_value('$live','$false').
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'$startup_goals' :-
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get_value('$extend_file_search_path',P), P \= [],
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set_value('$extend_file_search_path',[]),
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'$extend_file_search_path'(P),
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fail.
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'$startup_goals' :-
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recorded('$startup_goal',G,_),
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'$current_module'(Module),
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'$system_catch'('$query'(once(G), []),Module,Error,user:'$Error'(Error)),
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fail.
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'$startup_goals' :-
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get_value('$init_goal',GA),
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GA \= [],
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set_value('$init_goal',[]),
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'$run_atom_goal'(GA),
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fail.
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'$startup_goals' :-
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get_value('$myddas_goal',GA), GA \= [],
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set_value('$myddas_goal',[]),
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get_value('$myddas_user',User), User \= [],
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set_value('$myddas_user',[]),
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get_value('$myddas_db',Db), Db \= [],
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set_value('$myddas_db',[]),
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get_value('$myddas_host',HostT),
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( HostT \= [] ->
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Host = HostT,
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set_value('$myddas_host',[])
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;
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Host = localhost
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),
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get_value('$myddas_pass',PassT),
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( PassT \= [] ->
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Pass = PassT,
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set_value('$myddas_pass',[])
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;
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Pass = ''
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),
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use_module(library(myddas)),
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call(db_open(mysql,myddas,Host/Db,User,Pass)),
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'$myddas_import_all',
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fail.
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'$startup_goals'.
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'$startup_goals' :-
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get_value('$extend_file_search_path',P), P \= [],
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set_value('$extend_file_search_path',[]),
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'$extend_file_search_path'(P),
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fail.
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'$startup_goals' :-
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recorded('$startup_goal',G,_),
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'$current_module'(Module),
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'$system_catch'('$query'(once(G), []),Module,Error,user:'$Error'(Error)),
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fail.
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'$startup_goals' :-
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get_value('$init_goal',GA),
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GA \= [],
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set_value('$init_goal',[]),
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'$run_atom_goal'(GA),
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fail.
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'$startup_goals' :-
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get_value('$myddas_goal',GA), GA \= [],
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set_value('$myddas_goal',[]),
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get_value('$myddas_user',User), User \= [],
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set_value('$myddas_user',[]),
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get_value('$myddas_db',Db), Db \= [],
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set_value('$myddas_db',[]),
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get_value('$myddas_host',HostT),
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( HostT \= [] ->
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Host = HostT,
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set_value('$myddas_host',[])
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;
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Host = localhost
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),
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get_value('$myddas_pass',PassT),
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( PassT \= [] ->
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Pass = PassT,
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set_value('$myddas_pass',[])
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;
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Pass = ''
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),
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use_module(library(myddas)),
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call(db_open(mysql,myddas,Host/Db,User,Pass)),
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'$myddas_import_all',
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fail.
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'$startup_goals'.
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'$startup_reconsult' :-
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get_value('$consult_on_boot',X), X \= [], !,
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set_value('$consult_on_boot',[]),
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'$do_startup_reconsult'(X).
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'$startup_reconsult'.
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'$startup_reconsult' :-
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get_value('$consult_on_boot',X), X \= [], !,
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set_value('$consult_on_boot',[]),
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'$do_startup_reconsult'(X).
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'$startup_reconsult'.
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%
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% MYDDAS: Import all the tables from one database
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@ -241,26 +243,29 @@ true :- true.
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'$repeat'.
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'$repeat' :- '$repeat'.
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'$start_corouts' :- recorded('$corout','$corout'(Name,_,_),R), Name \= main, finish_corout(R),
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fail.
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'$start_corouts' :-
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eraseall('$corout'),
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eraseall('$result'),
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eraseall('$actual'),
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fail.
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'$start_corouts' :- recorda('$actual',main,_),
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recordz('$corout','$corout'(main,main,'$corout'([],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[])),_Ref),
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recorda('$result',going,_).
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'$start_corouts' :-
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recorded('$corout','$corout'(Name,_,_),R),
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Name \= main,
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finish_corout(R),
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fail.
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'$start_corouts' :-
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eraseall('$corout'),
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eraseall('$result'),
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eraseall('$actual'),
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fail.
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'$start_corouts' :- recorda('$actual',main,_),
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recordz('$corout','$corout'(main,main,'$corout'([],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[],[])),_Ref),
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recorda('$result',going,_).
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'$command'(C,VL,Con) :-
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'$access_yap_flags'(9,1), !,
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'$command'(C,VL,Con) :-
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'$access_yap_flags'(9,1), !,
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'$execute_command'(C,VL,Con,C).
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'$command'(C,VL,Con) :-
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( (Con = top ; var(C) ; C = [_|_]) ->
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'$execute_command'(C,VL,Con,C), ! ;
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expand_term(C, EC),
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'$execute_commands'(EC,VL,Con,C)
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).
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'$command'(C,VL,Con) :-
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( (Con = top ; var(C) ; C = [_|_]) ->
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'$execute_command'(C,VL,Con,C), ! ;
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expand_term(C, EC),
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'$execute_commands'(EC,VL,Con,C)
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).
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%
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% Hack in case expand_term has created a list of commands.
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@ -289,6 +294,11 @@ true :- true.
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'$execute_command'(R,_,top,Source) :- db_reference(R), !,
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'$do_error'(type_error(callable,R),meta_call(Source)).
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'$execute_command'(end_of_file,_,_,_) :- !.
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'$execute_command'(Command,_,_,_) :-
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nb_getval('$if_skip_mode',skip),
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\+ '$if_directive'(Command),
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!,
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fail.
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'$execute_command'((:-G),_,Option,_) :- !,
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'$current_module'(M),
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% allow user expansion
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|
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102
pl/consult.yap
102
pl/consult.yap
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@ -200,6 +200,8 @@ use_module(M,F,Is) :-
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'$csult'([F|L], M) :- '$consult'(F, M), '$csult'(L, M).
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'$do_lf'(ContextModule, Stream, InfLevel, _, Imports, SkipUnixComments, Reconsult, UseModule) :-
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nb_getval('$if_level',OldIncludeLevel),
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nb_setval('$if_level',0),
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nb_getval('$system_mode', OldMode),
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( OldMode == off -> '$enter_system_mode' ; true ),
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'$record_loaded'(Stream, ContextModule),
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@ -246,6 +248,11 @@ use_module(M,F,Is) :-
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set_value('$consulting',Old),
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set_value('$consulting_file',OldF),
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cd(OldD),
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nb_setval('$if_level',OldIncludeLevel),
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% surely, we were in run mode or we would not have included the file!
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nb_setval('$if_skip_mode',run),
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% back to include mode!
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nb_setval('$if_level',OldIncludeLevel),
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'$current_module'(Mod,OldModule),
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'$bind_module'(Mod, UseModule),
|
||||
'$import_to_current_module'(File, ContextModule, Imports),
|
||||
|
|
@ -758,3 +765,98 @@ absolute_file_name(File,Opts,TrueFileName) :-
|
|||
NewName =.. [N,NFile],
|
||||
'$find_in_path'(NewName, Opts, OFile, Goal).
|
||||
|
||||
%
|
||||
% This is complicated because of embedded ifs.
|
||||
%
|
||||
'$if'(_,top) :- !, fail.
|
||||
'$if'(Goal,_) :-
|
||||
nb_getval('$if_level',Level0),
|
||||
Level is Level0 + 1,
|
||||
nb_setval('$if_level',Level),
|
||||
nb_getval('$endif',OldEndif),
|
||||
nb_getval('$if_skip_mode',Mode),
|
||||
nb_setval('$endif',elif(Level,OldEndif,Mode)),
|
||||
fail.
|
||||
% we are in skip mode, ignore....
|
||||
'$if'(Goal,_) :-
|
||||
nb_getval('$endif',elif(Level, OldEndif, skip)), !,
|
||||
nb_setval('$endif',endif(Level, OldEndif, skip)).
|
||||
% we are in non skip mode, check....
|
||||
'$if'(Goal,_) :-
|
||||
('$if_call'(Goal)
|
||||
->
|
||||
% we will execute this branch, and later enter skip
|
||||
nb_getval('$endif',elif(Level,OldEndif,Mode)),
|
||||
nb_setval('$endif',endif(Level,OldEndif,Mode))
|
||||
;
|
||||
% we are now in skip, but can start an elif.
|
||||
nb_setval('$if_skip_mode',skip)
|
||||
).
|
||||
|
||||
'$else'(top) :- !, fail.
|
||||
'$else'(_) :-
|
||||
nb_getval('$if_level',0), !,
|
||||
'$do_error'(context_error(no_if),(:- else)).
|
||||
% we have done an if, so just skip
|
||||
'$else'(_) :-
|
||||
nb_getval('$endif',endif(_,_,_)), !,
|
||||
nb_setval('$if_skip_mode',skip).
|
||||
% we can try the elif
|
||||
'$else'(_) :-
|
||||
nb_getval('$if_level',Level),
|
||||
nb_getval('$endif',elif(Level,OldEndif,Mode)),
|
||||
nb_setval('$endif',endif(Level,OldEndif,Mode)),
|
||||
nb_setval('$if_skip_mode',run).
|
||||
|
||||
'$elif'(_,top) :- !, fail.
|
||||
'$elif'(Goal,_) :-
|
||||
nb_getval('$if_level',0),
|
||||
'$do_error'(context_error(no_if),(:- elif(Goal))).
|
||||
% we have done an if, so just skip
|
||||
'$elif'(_,_) :-
|
||||
nb_getval('$endif',endif(_,_,_)), !,
|
||||
nb_setval('$if_skip_mode',skip).
|
||||
% we can try the elif
|
||||
'$elif'(Goal,_) :-
|
||||
nb_getval('$if_level',Level),
|
||||
nb_getval('$endif',elif(Level,OldEndif,Mode)),
|
||||
('$if_call'(Goal)
|
||||
->
|
||||
% we will not skip, and we will not run any more branches.
|
||||
nb_setval('$endif',endif(Level,OldEndif,Mode)),
|
||||
nb_setval('$if_skip_mode',run)
|
||||
;
|
||||
% we will (keep) on skipping
|
||||
nb_setval('$if_skip_mode',skip)
|
||||
).
|
||||
'$elif'(_,_).
|
||||
|
||||
'$endif'(top) :- !, fail.
|
||||
'$endif'(_) :-
|
||||
% unmmatched endif.
|
||||
nb_getval('$if_level',0),
|
||||
'$do_error'(context_error(no_if),(:- endif)).
|
||||
'$endif'(_) :-
|
||||
% back to where you belong.
|
||||
nb_getval('$if_level',Level),
|
||||
nb_getval('$endif',Endif),
|
||||
Level0 is Level-1,
|
||||
nb_setval('$if_level',Level0),
|
||||
arg(2,Endif,OldEndif),
|
||||
arg(3,Endif,OldMode),
|
||||
nb_setval('$endif',OldEndif),
|
||||
nb_setval('$if_skip_mode',OldMode).
|
||||
|
||||
|
||||
'$if_call'(G) :-
|
||||
catch('$eval_if'(G), E, (print_message(error, E), fail)).
|
||||
|
||||
'$eval_if'(Goal) :-
|
||||
expand_term(Goal,TrueGoal),
|
||||
once(TrueGoal).
|
||||
|
||||
'$if_directive'((:- if(_))).
|
||||
'$if_directive'((:- else)).
|
||||
'$if_directive'((:- elif(_))).
|
||||
'$if_directive'((:- endif)).
|
||||
|
||||
|
|
|
|||
|
|
@ -50,6 +50,10 @@
|
|||
'$directive'(thread_local(_)).
|
||||
'$directive'(uncutable(_)).
|
||||
'$directive'(encoding(_)).
|
||||
'$directive'(if(_)).
|
||||
'$directive'(else).
|
||||
'$directive'(elif(_)).
|
||||
'$directive'(endif).
|
||||
|
||||
'$exec_directives'((G1,G2), Mode, M) :- !,
|
||||
'$exec_directives'(G1, Mode, M),
|
||||
|
|
@ -117,6 +121,14 @@
|
|||
'$table'(PredSpec, M).
|
||||
'$exec_directive'(uncutable(PredSpec), _, M) :-
|
||||
'$uncutable'(PredSpec, M).
|
||||
'$exec_directive'(if(Goal), Context, M) :-
|
||||
'$if'(M:Goal, Context).
|
||||
'$exec_directive'(else, Context, _) :-
|
||||
'$else'(Context).
|
||||
'$exec_directive'(elif(Goal), Context, M) :-
|
||||
'$elif'(M:Goal, Context).
|
||||
'$exec_directive'(endif, Context, _) :-
|
||||
'$endif'(Context).
|
||||
|
||||
|
||||
yap_flag(V,Out) :-
|
||||
|
|
|
|||
Reference in New Issue