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/* Copyright (C) 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2006,
* 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 3 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <errno.h>
#include "libguile/_scm.h"
#include "libguile/async.h"
#include "libguile/smob.h"
#include "libguile/alist.h"
#include "libguile/debug.h"
#include "libguile/hashtab.h"
#include "libguile/hash.h"
#include "libguile/ports.h"
#include "libguile/root.h"
#include "libguile/weaks.h"
#include "libguile/gc.h"
#include "libguile/validate.h"
#include "libguile/srcprop.h"
#include "libguile/private-options.h"
/* {Source Properties}
*
* Properties of source list expressions.
* Four of these have special meaning:
*
* filename string The name of the source file.
* copy list A copy of the list expression.
* line integer The source code line number.
* column integer The source code column number.
*
* Most properties above can be set by the reader.
*
*/
SCM_GLOBAL_SYMBOL (scm_sym_filename, "filename");
SCM_GLOBAL_SYMBOL (scm_sym_copy, "copy");
SCM_GLOBAL_SYMBOL (scm_sym_line, "line");
SCM_GLOBAL_SYMBOL (scm_sym_column, "column");
static SCM scm_source_whash;
static scm_i_pthread_mutex_t source_lock = SCM_I_PTHREAD_MUTEX_INITIALIZER;
/*
* Source properties are stored as double cells with the
* following layout:
* car = tag
* cbr = pos
* ccr = copy
* cdr = alist
*/
#define SRCPROPSP(p) (SCM_SMOB_PREDICATE (scm_tc16_srcprops, (p)))
#define SRCPROPPOS(p) (SCM_SMOB_DATA(p))
#define SRCPROPLINE(p) (SRCPROPPOS(p) >> 12)
#define SRCPROPCOL(p) (SRCPROPPOS(p) & 0x0fffL)
#define SRCPROPCOPY(p) (SCM_SMOB_OBJECT_2(p))
#define SRCPROPALIST(p) (SCM_SMOB_OBJECT_3(p))
#define SRCPROPMAKPOS(l, c) (((l) << 12) + (c))
#define SETSRCPROPPOS(p, l, c) (SCM_SET_SMOB_DATA_1 (p, SRCPROPMAKPOS (l, c)))
#define SETSRCPROPLINE(p, l) SETSRCPROPPOS (p, l, SRCPROPCOL (p))
#define SETSRCPROPCOL(p, c) SETSRCPROPPOS (p, SRCPROPLINE (p), c)
#define SETSRCPROPCOPY(p, c) (SCM_SET_SMOB_OBJECT_2 (p, c))
#define SETSRCPROPALIST(p, l) (SCM_SET_SMOB_OBJECT_3 (p, l))
static SCM scm_srcprops_to_alist (SCM obj);
scm_t_bits scm_tc16_srcprops;
static int
supports_source_props (SCM obj)
{
return SCM_NIMP (obj) && !scm_is_symbol (obj) && !scm_is_keyword (obj);
}
static int
srcprops_print (SCM obj, SCM port, scm_print_state *pstate)
{
int writingp = SCM_WRITINGP (pstate);
scm_puts ("#<srcprops ", port);
SCM_SET_WRITINGP (pstate, 1);
scm_iprin1 (scm_srcprops_to_alist (obj), port, pstate);
SCM_SET_WRITINGP (pstate, writingp);
scm_putc ('>', port);
return 1;
}
/*
* We remember the last file name settings, so we can share that alist
* entry. This works because scm_set_source_property_x does not use
* assoc-set! for modifying the alist.
*
* This variable contains a protected cons, whose cdr is the cached
* alist
*/
static SCM scm_last_alist_filename;
SCM
scm_make_srcprops (long line, int col, SCM filename, SCM copy, SCM alist)
{
if (!SCM_UNBNDP (filename))
{
SCM old_alist = alist;
/*
have to extract the acons, and operate on that, for
thread safety.
*/
SCM last_acons = SCM_CDR (scm_last_alist_filename);
if (scm_is_null (old_alist)
&& scm_is_eq (SCM_CDAR (last_acons), filename))
{
alist = last_acons;
}
else
{
alist = scm_acons (scm_sym_filename, filename, alist);
if (scm_is_null (old_alist))
SCM_SETCDR (scm_last_alist_filename, alist);
}
}
SCM_RETURN_NEWSMOB3 (scm_tc16_srcprops,
SRCPROPMAKPOS (line, col),
SCM_UNPACK (copy),
SCM_UNPACK (alist));
}
static SCM
scm_srcprops_to_alist (SCM obj)
{
SCM alist = SRCPROPALIST (obj);
if (!SCM_UNBNDP (SRCPROPCOPY (obj)))
alist = scm_acons (scm_sym_copy, SRCPROPCOPY (obj), alist);
alist = scm_acons (scm_sym_column, scm_from_int (SRCPROPCOL (obj)), alist);
alist = scm_acons (scm_sym_line, scm_from_int (SRCPROPLINE (obj)), alist);
return alist;
}
SCM_DEFINE (scm_supports_source_properties_p, "supports-source-properties?", 1, 0, 0,
(SCM obj),
"Return #t if @var{obj} supports adding source properties,\n"
"otherwise return #f.")
#define FUNC_NAME s_scm_supports_source_properties_p
{
return scm_from_bool (supports_source_props (obj));
}
#undef FUNC_NAME
SCM_DEFINE (scm_source_properties, "source-properties", 1, 0, 0,
(SCM obj),
"Return the source property association list of @var{obj}.")
#define FUNC_NAME s_scm_source_properties
{
if (SCM_IMP (obj))
return SCM_EOL;
else
{
SCM p;
scm_i_pthread_mutex_lock (&source_lock);
p = scm_hashq_ref (scm_source_whash, obj, SCM_EOL);
scm_i_pthread_mutex_unlock (&source_lock);
if (SRCPROPSP (p))
return scm_srcprops_to_alist (p);
else
/* list from set-source-properties!, or SCM_EOL for not found */
return p;
}
}
#undef FUNC_NAME
/* Perhaps this procedure should look through an alist
and try to make a srcprops-object...? */
SCM_DEFINE (scm_set_source_properties_x, "set-source-properties!", 2, 0, 0,
(SCM obj, SCM alist),
"Install the association list @var{alist} as the source property\n"
"list for @var{obj}.")
#define FUNC_NAME s_scm_set_source_properties_x
{
SCM_VALIDATE_NIM (1, obj);
scm_i_pthread_mutex_lock (&source_lock);
scm_hashq_set_x (scm_source_whash, obj, alist);
scm_i_pthread_mutex_unlock (&source_lock);
return alist;
}
#undef FUNC_NAME
int
scm_i_has_source_properties (SCM obj)
#define FUNC_NAME "%set-source-properties"
{
if (SCM_IMP (obj))
return 0;
else
{
int ret;
scm_i_pthread_mutex_lock (&source_lock);
ret = scm_is_true (scm_hashq_ref (scm_source_whash, obj, SCM_BOOL_F));
scm_i_pthread_mutex_unlock (&source_lock);
return ret;
}
}
#undef FUNC_NAME
void
scm_i_set_source_properties_x (SCM obj, long line, int col, SCM fname)
#define FUNC_NAME "%set-source-properties"
{
SCM_VALIDATE_NIM (1, obj);
scm_i_pthread_mutex_lock (&source_lock);
scm_hashq_set_x (scm_source_whash, obj,
scm_make_srcprops (line, col, fname,
SCM_COPY_SOURCE_P
? scm_copy_tree (obj)
: SCM_UNDEFINED,
SCM_EOL));
scm_i_pthread_mutex_unlock (&source_lock);
}
#undef FUNC_NAME
SCM_DEFINE (scm_source_property, "source-property", 2, 0, 0,
(SCM obj, SCM key),
"Return the source property specified by @var{key} from\n"
"@var{obj}'s source property list.")
#define FUNC_NAME s_scm_source_property
{
if (SCM_IMP (obj))
return SCM_BOOL_F;
else
{
SCM p;
scm_i_pthread_mutex_lock (&source_lock);
p = scm_hashq_ref (scm_source_whash, obj, SCM_EOL);
scm_i_pthread_mutex_unlock (&source_lock);
if (!SRCPROPSP (p))
goto alist;
if (scm_is_eq (scm_sym_line, key))
p = scm_from_int (SRCPROPLINE (p));
else if (scm_is_eq (scm_sym_column, key))
p = scm_from_int (SRCPROPCOL (p));
else if (scm_is_eq (scm_sym_copy, key))
p = SRCPROPCOPY (p);
else
{
p = SRCPROPALIST (p);
alist:
p = scm_assoc (key, p);
return (SCM_NIMP (p) ? SCM_CDR (p) : SCM_BOOL_F);
}
return SCM_UNBNDP (p) ? SCM_BOOL_F : p;
}
}
#undef FUNC_NAME
SCM_DEFINE (scm_set_source_property_x, "set-source-property!", 3, 0, 0,
(SCM obj, SCM key, SCM datum),
"Set the source property of object @var{obj}, which is specified by\n"
"@var{key} to @var{datum}. Normally, the key will be a symbol.")
#define FUNC_NAME s_scm_set_source_property_x
{
SCM p;
SCM_VALIDATE_NIM (1, obj);
scm_i_pthread_mutex_lock (&source_lock);
p = scm_hashq_ref (scm_source_whash, obj, SCM_EOL);
if (scm_is_eq (scm_sym_line, key))
{
if (SRCPROPSP (p))
SETSRCPROPLINE (p, scm_to_int (datum));
else
scm_hashq_set_x (scm_source_whash, obj,
scm_make_srcprops (scm_to_int (datum), 0,
SCM_UNDEFINED, SCM_UNDEFINED, p));
}
else if (scm_is_eq (scm_sym_column, key))
{
if (SRCPROPSP (p))
SETSRCPROPCOL (p, scm_to_int (datum));
else
scm_hashq_set_x (scm_source_whash, obj,
scm_make_srcprops (0, scm_to_int (datum),
SCM_UNDEFINED, SCM_UNDEFINED, p));
}
else if (scm_is_eq (scm_sym_copy, key))
{
if (SRCPROPSP (p))
SETSRCPROPCOPY (p, datum);
else
scm_hashq_set_x (scm_source_whash, obj,
scm_make_srcprops (0, 0, SCM_UNDEFINED, datum, p));
}
else
{
if (SRCPROPSP (p))
SETSRCPROPALIST (p, scm_acons (key, datum, SRCPROPALIST (p)));
else
scm_hashq_set_x (scm_source_whash, obj,
scm_acons (key, datum, p));
}
scm_i_pthread_mutex_unlock (&source_lock);
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
SCM_DEFINE (scm_cons_source, "cons-source", 3, 0, 0,
(SCM xorig, SCM x, SCM y),
"Create and return a new pair whose car and cdr are @var{x} and @var{y}.\n"
"Any source properties associated with @var{xorig} are also associated\n"
"with the new pair.")
#define FUNC_NAME s_scm_cons_source
{
SCM p, z;
z = scm_cons (x, y);
scm_i_pthread_mutex_lock (&source_lock);
/* Copy source properties possibly associated with xorig. */
p = scm_hashq_ref (scm_source_whash, xorig, SCM_BOOL_F);
if (scm_is_true (p))
scm_hashq_set_x (scm_source_whash, z, p);
scm_i_pthread_mutex_unlock (&source_lock);
return z;
}
#undef FUNC_NAME
void
scm_init_srcprop ()
{
scm_tc16_srcprops = scm_make_smob_type ("srcprops", 0);
scm_set_smob_print (scm_tc16_srcprops, srcprops_print);
scm_source_whash = scm_make_weak_key_hash_table (scm_from_int (2047));
scm_c_define ("source-whash", scm_source_whash);
scm_last_alist_filename = scm_cons (SCM_EOL,
scm_acons (SCM_EOL, SCM_EOL, SCM_EOL));
#include "libguile/srcprop.x"
}
/*
Local Variables:
c-file-style: "gnu"
End:
*/
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