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guile/libguile/dynwind.c
Michael Livshin 1be6b49ccb * validate.h 
(SCM_NUM2{SIZE,PTRDIFF,SHORT,USHORT,BITS,UBITS,INT,UINT}[_DEF]):
new macros.

* unif.h: type renaming:
scm_array -> scm_array_t
scm_array_dim -> scm_array_dim_t
the old names are deprecated, all in-Guile uses changed.

* tags.h (scm_ubits_t): new typedef, representing unsigned
scm_bits_t.

* stacks.h: type renaming:
scm_info_frame -> scm_info_frame_t
scm_stack -> scm_stack_t
the old names are deprecated, all in-Guile uses changed.

* srcprop.h: type renaming:
scm_srcprops -> scm_srcprops_t
scm_srcprops_chunk -> scm_srcprops_chunk_t
the old names are deprecated, all in-Guile uses changed.

* gsubr.c, procs.c, print.c, ports.c, read.c, rdelim.c, ramap.c,
rw.c, smob.c, sort.c, srcprop.c, stacks.c, strings.c, strop.c,
strorder.c, strports.c, struct.c, symbols.c, unif.c, values.c,
vectors.c, vports.c, weaks.c:
various int/size_t -> size_t/scm_bits_t changes.

* random.h: type renaming:
scm_rstate -> scm_rstate_t
scm_rng -> scm_rng_t
scm_i_rstate -> scm_i_rstate_t
the old names are deprecated, all in-Guile uses changed.

* procs.h: type renaming:
scm_subr_entry -> scm_subr_entry_t
the old name is deprecated, all in-Guile uses changed.

* options.h (scm_option_t.val): unsigned long -> scm_bits_t.
type renaming:
scm_option -> scm_option_t
the old name is deprecated, all in-Guile uses changed.

* objects.c: various long -> scm_bits_t changes.
(scm_i_make_class_object): flags: unsigned long -> scm_ubits_t

* numbers.h (SCM_FIXNUM_BIT): deprecated, renamed to
SCM_I_FIXNUM_BIT.

* num2integral.i.c: new file, multiply included by numbers.c, used
to "templatize" the various integral <-> num conversion routines.

* numbers.c (scm_mkbig, scm_big2num, scm_adjbig, scm_normbig,
scm_copybig, scm_2ulong2big, scm_dbl2big, scm_big2dbl):
deprecated.
(scm_i_mkbig, scm_i_big2inum, scm_i_adjbig, scm_i_normbig,
scm_i_copybig, scm_i_short2big, scm_i_ushort2big, scm_i_int2big,
scm_i_uint2big, scm_i_long2big, scm_i_ulong2big, scm_i_bits2big,
scm_i_ubits2big, scm_i_size2big, scm_i_ptrdiff2big,
scm_i_long_long2big, scm_i_ulong_long2big, scm_i_dbl2big,
scm_i_big2dbl, scm_short2num, scm_ushort2num, scm_int2num,
scm_uint2num, scm_bits2num, scm_ubits2num, scm_size2num,
scm_ptrdiff2num, scm_num2short, scm_num2ushort, scm_num2int,
scm_num2uint, scm_num2bits, scm_num2ubits, scm_num2ptrdiff,
scm_num2size): new functions.

* modules.c (scm_module_reverse_lookup): i, n: int -> scm_bits_t.x

* load.c: change int -> size_t in various places (where the
variable is used to store a string length).
(search-path): call scm_done_free, not scm_done_malloc.

* list.c (scm_ilength): return a scm_bits_t, not long.
some other {int,long} -> scm_bits_t changes.

* hashtab.c: various [u]int -> scm_bits_t changes.
scm_ihashx_closure -> scm_ihashx_closure_t (and made a typedef).
(scm_ihashx): n: uint -> scm_bits_t
use scm_bits2num instead of scm_ulong2num.

* gsubr.c: various int -> scm_bits_t changes.

* gh_data.c (gh_scm2double): no loss of precision any more.

* gh.h (gh_str2scm): len: int -> size_t
(gh_{get,set}_substr): start: int -> scm_bits_t,
len: int -> size_t
(gh_<num>2scm): n: int -> scm_bits_t
(gh_*vector_length): return scm_[u]size_t, not unsigned long.
(gh_length): return scm_bits_t, not unsigned long.

* fports.h: type renaming:
scm_fport -> scm_fport_t
the old name is deprecated, all in-Guile uses changed.

* fports.c (fport_fill_input): count: int -> scm_bits_t
(fport_flush): init_size, remaining, count: int -> scm_bits_t

* debug.h (scm_lookup_cstr, scm_lookup_soft, scm_evstr): removed
those prototypes, as the functions they prototype don't exist.

* fports.c (default_buffer_size): int -> size_t
(scm_fport_buffer_add): read_size, write_size: int -> scm_bits_t
default_size: int -> size_t
(scm_setvbuf): csize: int -> scm_bits_t

* fluids.c (n_fluids): int -> scm_bits_t
(grow_fluids): old_length, i: int -> scm_bits_t
(next_fluid_num, scm_fluid_ref, scm_fluid_set_x): n: int ->
scm_bits_t
(scm_c_with_fluids): flen, vlen: int -> scm_bits_t

* filesys.c (s_scm_open_fdes): changed calls to SCM_NUM2LONG to
the new and shiny SCM_NUM2INT.

* extensions.c: extension -> extension_t (and made a typedef).

* eval.h (SCM_IFRAME): cast to scm_bits_t, not int.  just so
there are no nasty surprises if/when the various deeply magic tag
bits move somewhere else.

* eval.c: changed the locals used to store results of SCM_IFRAME,
scm_ilength and such to be of type scm_bits_t (and not int/long).
(iqq): depth, edepth: int -> scm_bits_t
(scm_eval_stack): int -> scm_bits_t
(SCM_CEVAL): various vars are not scm_bits_t instead of int.
(check_map_args, scm_map, scm_for_each): len: long -> scm_bits_t
i: int -> scm_bits_t

* environments.c: changed the many calls to scm_ulong2num to
scm_ubits2num.
(import_environment_fold): proc_as_ul: ulong -> scm_ubits_t

* dynwind.c (scm_dowinds): delta: long -> scm_bits_t

* debug.h: type renaming:
scm_debug_info -> scm_debug_info_t
scm_debug_frame -> scm_debug_frame_t
the old names are deprecated, all in-Guile uses changed.
(scm_debug_eframe_size): int -> scm_bits_t

* debug.c (scm_init_debug): use scm_c_define instead of the
deprecated scm_define.

* continuations.h: type renaming:
scm_contregs -> scm_contregs_t
the old name is deprecated, all in-Guile uses changed.
(scm_contregs_t.num_stack_items): size_t -> scm_bits_t
(scm_contregs_t.num_stack_items): ulong -> scm_ubits_t

* continuations.c (scm_make_continuation): change the type of
stack_size form long to scm_bits_t.

* ports.h: type renaming:
scm_port_rw_active -> scm_port_rw_active_t (and made a typedef)
scm_port -> scm_port_t
scm_ptob_descriptor -> scm_ptob_descriptor_t
the old names are deprecated, all in-Guile uses changed.
(scm_port_t.entry): int -> scm_bits_t.
(scm_port_t.line_number): int -> long.
(scm_port_t.putback_buf_size): int -> size_t.

* __scm.h (long_long, ulong_long): deprecated (they pollute the
global namespace and have little value besides that).
(SCM_BITS_LENGTH): new, is the bit size of scm_bits_t (i.e. of an
SCM handle).
(ifdef spaghetti): include sys/types.h and sys/stdtypes.h, if they
exist (for size_t & ptrdiff_t)
(scm_sizet): deprecated.

* Makefile.am (noinst_HEADERS): add num2integral.i.c
2001-05-24 00:50:51 +00:00

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/* Copyright (C) 1995, 1996, 1998, 1999, 2000 Free Software Foundation, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*
* As a special exception, the Free Software Foundation gives permission
* for additional uses of the text contained in its release of GUILE.
*
* The exception is that, if you link the GUILE library with other files
* to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the GUILE library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by the
* Free Software Foundation under the name GUILE. If you copy
* code from other Free Software Foundation releases into a copy of
* GUILE, as the General Public License permits, the exception does
* not apply to the code that you add in this way. To avoid misleading
* anyone as to the status of such modified files, you must delete
* this exception notice from them.
*
* If you write modifications of your own for GUILE, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice. */
/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
#include "libguile/_scm.h"
#include "libguile/eval.h"
#include "libguile/alist.h"
#include "libguile/fluids.h"
#include "libguile/ports.h"
#include "libguile/smob.h"
#include "libguile/dynwind.h"
/* {Dynamic wind}
Things that can be on the wind list:
(enter-proc . leave-proc) dynamic-wind
(tag . jmpbuf) catch
(tag . lazy-catch) lazy-catch
tag is either a symbol or a boolean
((fluid ...) . (value ...)) with-fluids
*/
SCM_DEFINE (scm_dynamic_wind, "dynamic-wind", 3, 0, 0,
(SCM in_guard, SCM thunk, SCM out_guard),
"All three arguments must be 0-argument procedures.\n"
"@var{in_guard} is called, then @var{thunk}, then\n"
"@var{out_guard}.\n"
"\n"
"If, any time during the execution of @var{thunk}, the\n"
"continuation of the @code{dynamic_wind} expression is escaped\n"
"non-locally, @var{out_guard} is called. If the continuation of\n"
"the dynamic-wind is re-entered, @var{in_guard} is called. Thus\n"
"@var{in_guard} and @var{out_guard} may be called any number of\n"
"times.\n"
"@lisp\n"
"(define x 'normal-binding)\n"
"@result{} x\n"
"(define a-cont (call-with-current-continuation \n"
" (lambda (escape)\n"
" (let ((old-x x))\n"
" (dynamic-wind\n"
" ;; in-guard:\n"
" ;;\n"
" (lambda () (set! x 'special-binding))\n"
"\n"
" ;; thunk\n"
" ;;\n"
" (lambda () (display x) (newline)\n"
" (call-with-current-continuation escape)\n"
" (display x) (newline)\n"
" x)\n"
"\n"
" ;; out-guard:\n"
" ;;\n"
" (lambda () (set! x old-x)))))))\n"
"\n"
";; Prints: \n"
"special-binding\n"
";; Evaluates to:\n"
"@result{} a-cont\n"
"x\n"
"@result{} normal-binding\n"
"(a-cont #f)\n"
";; Prints:\n"
"special-binding\n"
";; Evaluates to:\n"
"@result{} a-cont ;; the value of the (define a-cont...)\n"
"x\n"
"@result{} normal-binding\n"
"a-cont\n"
"@result{} special-binding\n"
"@end lisp")
#define FUNC_NAME s_scm_dynamic_wind
{
SCM ans;
SCM_ASSERT (SCM_NFALSEP (scm_thunk_p (out_guard)),
out_guard,
SCM_ARG3, FUNC_NAME);
scm_apply (in_guard, SCM_EOL, SCM_EOL);
scm_dynwinds = scm_acons (in_guard, out_guard, scm_dynwinds);
ans = scm_apply (thunk, SCM_EOL, SCM_EOL);
scm_dynwinds = SCM_CDR (scm_dynwinds);
scm_apply (out_guard, SCM_EOL, SCM_EOL);
return ans;
}
#undef FUNC_NAME
/* The implementation of a C-callable dynamic-wind,
* scm_internal_dynamic_wind, requires packaging of C pointers in a
* smob. Objects of this type are pushed onto the dynwind chain.
*/
#define SCM_GUARDSP(obj) SCM_TYP16_PREDICATE (tc16_guards, obj)
#define SCM_BEFORE_GUARD(obj) ((scm_guard_t) SCM_CELL_WORD (obj, 1))
#define SCM_AFTER_GUARD(obj) ((scm_guard_t) SCM_CELL_WORD (obj, 2))
#define SCM_GUARD_DATA(obj) ((void *) SCM_CELL_WORD (obj, 3))
static scm_bits_t tc16_guards;
static int
guards_print (SCM exp, SCM port, scm_print_state *pstate)
{
scm_puts ("#<guards ", port);
scm_intprint (SCM_UNPACK (SCM_CDR (exp)), 16, port);
scm_putc ('>', port);
return 1;
}
SCM
scm_internal_dynamic_wind (scm_guard_t before,
scm_inner_t inner,
scm_guard_t after,
void *inner_data,
void *guard_data)
{
SCM guards, ans;
before (guard_data);
SCM_NEWSMOB3 (guards, tc16_guards, (scm_bits_t) before,
(scm_bits_t) after, (scm_bits_t) guard_data);
scm_dynwinds = scm_acons (guards, SCM_BOOL_F, scm_dynwinds);
ans = inner (inner_data);
scm_dynwinds = SCM_CDR (scm_dynwinds);
after (guard_data);
return ans;
}
#ifdef GUILE_DEBUG
SCM_DEFINE (scm_wind_chain, "wind-chain", 0, 0, 0,
(),
"Return the current wind chain. The wind chain contains all\n"
"information required by @code{dynamic-wind} to call its\n"
"argument thunks when entering/exiting its scope.")
#define FUNC_NAME s_scm_wind_chain
{
return scm_dynwinds;
}
#undef FUNC_NAME
#endif
static void
scm_swap_bindings (SCM glocs, SCM vals)
{
SCM tmp;
while (SCM_NIMP (vals))
{
tmp = SCM_GLOC_VAL (SCM_CAR (glocs));
SCM_GLOC_SET_VAL (SCM_CAR (glocs), SCM_CAR (vals));
SCM_SETCAR (vals, tmp);
glocs = SCM_CDR (glocs);
vals = SCM_CDR (vals);
}
}
void
scm_dowinds (SCM to, scm_bits_t delta)
{
tail:
if (SCM_EQ_P (to, scm_dynwinds));
else if (delta < 0)
{
SCM wind_elt;
SCM wind_key;
scm_dowinds (SCM_CDR (to), 1 + delta);
wind_elt = SCM_CAR (to);
#if 0
if (SCM_INUMP (wind_elt))
{
scm_cross_dynwind_binding_scope (wind_elt, 0);
}
else
#endif
{
wind_key = SCM_CAR (wind_elt);
/* key = #t | symbol | thunk | list of glocs | list of fluids */
if (SCM_NIMP (wind_key))
{
if (SCM_TYP3 (wind_key) == scm_tc3_cons_gloc)
scm_swap_bindings (wind_key, SCM_CDR (wind_elt));
else if (SCM_TYP3 (wind_key) == scm_tc3_cons)
scm_swap_fluids (wind_key, SCM_CDR (wind_elt));
else if (SCM_GUARDSP (wind_key))
SCM_BEFORE_GUARD (wind_key) (SCM_GUARD_DATA (wind_key));
else if (SCM_TYP3 (wind_key) == scm_tc3_closure)
scm_apply (wind_key, SCM_EOL, SCM_EOL);
}
}
scm_dynwinds = to;
}
else
{
SCM from;
SCM wind_elt;
SCM wind_key;
from = SCM_CDR (SCM_CAR (scm_dynwinds));
wind_elt = SCM_CAR (scm_dynwinds);
scm_dynwinds = SCM_CDR (scm_dynwinds);
#if 0
if (SCM_INUMP (wind_elt))
{
scm_cross_dynwind_binding_scope (wind_elt, 0);
}
else
#endif
{
wind_key = SCM_CAR (wind_elt);
if (SCM_NIMP (wind_key))
{
if (SCM_TYP3 (wind_key) == scm_tc3_cons_gloc)
scm_swap_bindings (wind_key, from);
else if (SCM_TYP3 (wind_key) == scm_tc3_cons)
scm_swap_fluids_reverse (wind_key, from);
else if (SCM_GUARDSP (wind_key))
SCM_AFTER_GUARD (wind_key) (SCM_GUARD_DATA (wind_key));
else if (SCM_TYP3 (wind_key) == scm_tc3_closure)
scm_apply (from, SCM_EOL, SCM_EOL);
}
}
delta--;
goto tail; /* scm_dowinds(to, delta-1); */
}
}
void
scm_init_dynwind ()
{
tc16_guards = scm_make_smob_type ("guards", 0);
scm_set_smob_print (tc16_guards, guards_print);
#ifndef SCM_MAGIC_SNARFER
#include "libguile/dynwind.x"
#endif
}
/*
Local Variables:
c-file-style: "gnu"
End:
*/
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