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/* $Id: pl-error.c,v 1.3 1998/08/06 13:26:53 jan Exp $
Part of SWI-Prolog
Designed and implemented by Jan Wielemaker
E-mail: jan@swi.psy.uva.nl
Copyright (C) 1997 University of Amsterdam. All rights reserved.
*/
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
throw(error(<Formal>, <SWI-Prolog>))
<SWI-Prolog> ::= context(Name/Arity, Message)
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#include "pl-incl.h"
#ifndef EACCES
#include <errno.h>
#endif
static void
put_name_arity(term_t t, functor_t f)
{ FunctorDef fdef = valueFunctor(f);
if ( fdef->arity == 0 )
PL_put_atom(t, fdef->name);
else
{ term_t a = PL_new_term_refs(2);
PL_put_atom(a+0, fdef->name);
PL_put_integer(a+1, fdef->arity);
PL_cons_functor(t, FUNCTOR_divide2, a+0, a+1);
}
}
int
PL_error(const char *pred, int arity, const char *msg, int id, ...)
{ term_t except = PL_new_term_ref();
term_t formal = PL_new_term_ref();
term_t swi = PL_new_term_ref();
va_list args;
if ( msg == MSG_ERRNO )
msg = OsError();
/* build (ISO) formal part */
va_start(args, id);
switch(id)
{ case ERR_INSTANTIATION:
err_instantiation:
PL_unify_atom(formal, ATOM_instantiation_error);
break;
case ERR_TYPE: /* ERR_INSTANTIATION if var(actual) */
{ atom_t expected = va_arg(args, atom_t);
term_t actual = va_arg(args, term_t);
if ( PL_is_variable(actual) && expected != ATOM_variable )
goto err_instantiation;
PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_type_error2,
PL_ATOM, expected,
PL_TERM, actual);
break;
}
case ERR_AR_TYPE: /* arithmetic type error */
{ atom_t expected = va_arg(args, atom_t);
Number num = va_arg(args, Number);
term_t actual = PL_new_term_ref();
_PL_put_number(actual, num);
PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_type_error2,
PL_ATOM, expected,
PL_TERM, actual);
break;
}
case ERR_AR_UNDEF:
{ PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_evaluation_error1,
PL_ATOM, ATOM_undefined);
break;
}
case ERR_AR_OVERFLOW:
{ PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_evaluation_error1,
PL_ATOM, ATOM_float_overflow);
break;
}
case ERR_AR_UNDERFLOW:
{ PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_evaluation_error1,
PL_ATOM, ATOM_float_underflow);
break;
}
case ERR_DOMAIN: /* ERR_INSTANTIATION if var(arg) */
{ atom_t domain = va_arg(args, atom_t);
term_t arg = va_arg(args, term_t);
if ( PL_is_variable(arg) )
goto err_instantiation;
PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_domain_error2,
PL_ATOM, domain,
PL_TERM, arg);
break;
}
case ERR_REPRESENTATION:
{ atom_t what = va_arg(args, atom_t);
PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_representation_error1,
PL_ATOM, what);
break;
}
case ERR_MODIFY_STATIC_PROC:
{ Procedure proc = va_arg(args, Procedure);
term_t pred = PL_new_term_ref();
unify_definition(pred, proc->definition, 0, GP_NAMEARITY);
PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_permission_error3,
PL_ATOM, ATOM_modify,
PL_ATOM, ATOM_static_procedure,
PL_TERM, pred);
break;
}
case ERR_UNDEFINED_PROC:
{ Definition def = va_arg(args, Definition);
term_t pred = PL_new_term_ref();
unify_definition(pred, def, 0, GP_NAMEARITY);
PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_existence_error2,
PL_ATOM, ATOM_procedure,
PL_TERM, pred);
break;
}
case ERR_FAILED:
{ Procedure proc = va_arg(args, Procedure);
term_t pred = PL_new_term_ref();
unify_definition(pred, proc->definition, 0, GP_NAMEARITY);
PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_failure_error1,
PL_TERM, pred);
break;
}
case ERR_EVALUATION:
{ atom_t what = va_arg(args, atom_t);
PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_evaluation_error1,
PL_ATOM, what);
break;
}
case ERR_NOT_EVALUABLE:
{ functor_t f = va_arg(args, functor_t);
term_t actual = PL_new_term_ref();
put_name_arity(actual, f);
PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_type_error2,
PL_ATOM, ATOM_evaluable,
PL_TERM, actual);
break;
}
case ERR_DIV_BY_ZERO:
{ PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_evaluation_error1,
PL_ATOM, ATOM_zero_divisor);
break;
}
case ERR_PERMISSION:
{ atom_t type = va_arg(args, atom_t);
atom_t op = va_arg(args, atom_t);
term_t obj = va_arg(args, term_t);
PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_permission_error3,
PL_ATOM, type,
PL_ATOM, op,
PL_TERM, obj);
break;
}
case ERR_EXISTENCE:
{ atom_t type = va_arg(args, atom_t);
term_t obj = va_arg(args, term_t);
PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_existence_error2,
PL_ATOM, type,
PL_TERM, obj);
break;
}
case ERR_FILE_OPERATION:
{ atom_t action = va_arg(args, atom_t);
atom_t type = va_arg(args, atom_t);
term_t file = va_arg(args, term_t);
switch(errno)
{ case EACCES:
PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_permission_error3,
PL_ATOM, action,
PL_ATOM, type,
PL_TERM, file);
break;
case EMFILE:
case ENFILE:
PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_representation_error1,
PL_ATOM, ATOM_max_files);
break;
default: /* what about the other cases? */
PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_existence_error2,
PL_ATOM, type,
PL_TERM, file);
break;
}
break;
}
case ERR_STREAM_OP:
{ atom_t action = va_arg(args, atom_t);
term_t stream = va_arg(args, term_t);
PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_io_error2,
PL_ATOM, action,
PL_TERM, stream);
break;
}
case ERR_NOTIMPLEMENTED: /* non-ISO */
{ atom_t what = va_arg(args, atom_t);
PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_not_implemented_error1,
PL_ATOM, what);
break;
}
case ERR_RESOURCE:
{ atom_t what = va_arg(args, atom_t);
PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_not_implemented_error1,
PL_ATOM, what);
break;
}
case ERR_NOMEM:
{ PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_resource_error1,
PL_ATOM, ATOM_no_memory);
break;
}
case ERR_SYSCALL:
{ atom_t op = va_arg(args, atom_t);
if ( !msg )
msg = PL_atom_chars(op);
switch(errno)
{ case ENOMEM:
PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_resource_error1,
PL_ATOM, ATOM_no_memory);
break;
default:
PL_unify_atom(formal, ATOM_system_error);
break;
}
break;
}
case ERR_SHELL_FAILED:
{ term_t cmd = va_arg(args, term_t);
PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_shell2,
PL_ATOM, ATOM_execute,
PL_TERM, cmd);
break;
}
case ERR_SHELL_SIGNALLED:
{ term_t cmd = va_arg(args, term_t);
int sig = va_arg(args, int);
PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_shell2,
PL_FUNCTOR, FUNCTOR_signal1,
PL_INTEGER, sig,
PL_TERM, cmd);
break;
}
case ERR_SIGNALLED:
{ int sig = va_arg(args, int);
char *signame = va_arg(args, char *);
PL_unify_term(formal,
PL_FUNCTOR, FUNCTOR_signal2,
PL_CHARS, signame,
PL_INTEGER, sig);
break;
}
default:
assert(0);
}
va_end(args);
/* build SWI-Prolog context term */
if ( pred || msg )
{ term_t predterm = PL_new_term_ref();
term_t msgterm = PL_new_term_ref();
if ( pred )
{ PL_unify_term(predterm,
PL_FUNCTOR, FUNCTOR_divide2,
PL_CHARS, pred,
PL_INTEGER, arity);
}
if ( msg )
{ PL_put_atom_chars(msgterm, msg);
}
PL_unify_term(swi,
PL_FUNCTOR, FUNCTOR_context2,
PL_TERM, predterm,
PL_TERM, msgterm);
}
PL_unify_term(except,
PL_FUNCTOR, FUNCTOR_error2,
PL_TERM, formal,
PL_TERM, swi);
return PL_raise_exception(except);
}
char *
tostr(char *buf, const char *fmt, ...)
{ va_list args;
va_start(args, fmt);
Svsprintf(buf, fmt, args);
va_end(args);
return buf;
}
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