#ifndef SCM_INLINE_H
#define SCM_INLINE_H
-/* Copyright (C) 2001 Free Software Foundation, Inc.
+/* Copyright (C) 2001, 2002 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 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 2.1 of the License, or (at your option) any later version.
*
- * This program is distributed in the hope that it will be useful,
+ * 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 General Public License for more details.
+ * 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 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. */
+ * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
/* This file is for inline functions. On platforms that don't support
inlining functions, they are turned into ordinary functions. See
"inline.c".
*/
+#include "libguile/__scm.h"
+
+#if (SCM_DEBUG_CELL_ACCESSES == 1)
+#include <stdio.h>
+#endif
#include "libguile/pairs.h"
#include "libguile/gc.h"
+#include "libguile/threads.h"
SCM_API SCM scm_cell (scm_t_bits car, scm_t_bits cdr);
SCM_API SCM scm_double_cell (scm_t_bits car, scm_t_bits cbr,
scm_t_bits ccr, scm_t_bits cdr);
-#ifdef HAVE_INLINE
-#ifndef EXTERN_INLINE
-#define EXTERN_INLINE extern inline
-#endif
+
+#if defined SCM_C_INLINE || defined SCM_INLINE_C_INCLUDING_INLINE_H
+/* either inlining, or being included from inline.c. We use (and
+ repeat) this long #if test here and below so that we don't have to
+ introduce any extraneous symbols into the public namespace. We
+ only need SCM_C_INLINE to be seen publically . */
extern unsigned scm_newcell2_count;
extern unsigned scm_newcell_count;
-
-
-EXTERN_INLINE
+#if defined SCM_C_INLINE && ! defined SCM_INLINE_C_INCLUDING_INLINE_H
+/* definitely inlining */
+extern SCM_C_INLINE
+#endif
SCM
scm_cell (scm_t_bits car, scm_t_bits cdr)
{
SCM z;
+ /* We retrieve the SCM pointer only once since the call to
+ SCM_FREELIST_LOC will be slightly expensive when we support
+ preemptive multithreading. SCM_FREELIST_DOC will then retrieve
+ the thread specific freelist.
+
+ Until then, SCM_FREELIST_DOC expands to (&scm_i_freelist) and the
+ following code will compile to the same as if we had worked
+ directly on the scm_i_freelist variable.
+ */
+ SCM *freelist = SCM_FREELIST_LOC (scm_i_freelist);
- if (SCM_NULLP (scm_i_freelist))
- {
- z = scm_gc_for_newcell (&scm_i_master_freelist, &scm_i_freelist);
- }
+ if (SCM_NULLP (*freelist))
+ z = scm_gc_for_newcell (&scm_i_master_freelist, freelist);
else
{
- z = scm_i_freelist;
- scm_i_freelist = SCM_FREE_CELL_CDR (scm_i_freelist);
+ z = *freelist;
+ *freelist = SCM_FREE_CELL_CDR (*freelist);
}
/*
#if (SCM_DEBUG_CELL_ACCESSES == 1)
if (scm_debug_cell_accesses_p)
- {
- if (SCM_GC_MARK_P (z))
- {
- fprintf(stderr, "scm_cell tried to allocate a marked cell.\n");
- abort();
- }
- else if (SCM_GC_CELL_TYPE(z) != scm_tc_free_cell)
- {
- fprintf(stderr, "cell from freelist is not a free cell.\n");
- abort();
- }
+ {
+ if (SCM_GC_MARK_P (z))
+ {
+ fprintf(stderr, "scm_cell tried to allocate a marked cell.\n");
+ abort();
+ }
+ else if (SCM_GC_CELL_TYPE(z) != scm_tc_free_cell)
+ {
+ fprintf(stderr, "cell from freelist is not a free cell.\n");
+ abort();
+ }
+ }
+
+ /*
+ Always set mark. Otherwise cells that are alloced before
+ scm_debug_cell_accesses_p is toggled seem invalid.
+ */
+ SCM_SET_GC_MARK (z);
+
+ /*
+ TODO: figure out if this use of mark bits is valid with
+ threading. What if another thread is doing GC at this point
+ ... ?
+ */
- SCM_SET_GC_MARK (z);
- }
#endif
SCM_GC_SET_CELL_WORD (z, 1, cdr);
SCM_GC_SET_CELL_WORD (z, 0, car);
-#ifdef USE_THREADS
-#ifndef USE_COOP_THREADS
- /* When we are using non-cooperating threads, we might need to make
+#if 0 /*fixme* Hmm... let's consider this later. */
+#if !defined(SCM_USE_COOP_THREADS) && !defined(SCM_USE_NULL_THREADS) && !defined(SCM_USE_COPT_THREADS)
+ /* When we are using preemtive threads, we might need to make
sure that the initial values for the slots are protected until
the cell is completely initialized.
*/
#endif
#endif
-
#if (SCM_DEBUG_CELL_ACCESSES == 1)
if (scm_expensive_debug_cell_accesses_p )
scm_i_expensive_validation_check (z);
return z;
}
-EXTERN_INLINE
+#if defined SCM_C_INLINE && ! defined SCM_INLINE_C_INCLUDING_INLINE_H
+/* definitely inlining */
+extern SCM_C_INLINE
+#endif
SCM
scm_double_cell (scm_t_bits car, scm_t_bits cbr,
scm_t_bits ccr, scm_t_bits cdr)
{
SCM z;
+ SCM *freelist = SCM_FREELIST_LOC (scm_i_freelist2);
-
- if (SCM_NULLP (scm_i_freelist2))
- {
- z = scm_gc_for_newcell (&scm_i_master_freelist2, &scm_i_freelist2);
- }
+ if (SCM_NULLP (*freelist))
+ z = scm_gc_for_newcell (&scm_i_master_freelist2, freelist);
else
{
- z = scm_i_freelist2;
- scm_i_freelist2 = SCM_FREE_CELL_CDR (scm_i_freelist2);
+ z = *freelist;
+ *freelist = SCM_FREE_CELL_CDR (*freelist);
}
scm_cells_allocated += 2;
SCM_GC_SET_CELL_WORD (z, 3, cdr);
SCM_GC_SET_CELL_WORD (z, 0, car);
-#ifdef USE_THREADS
-#ifndef USE_COOP_THREADS
+#if 0 /*fixme* Hmm... let's consider this later. */
+#if !defined(SCM_USE_COOP_THREADS) && !defined(SCM_USE_NULL_THREADS) && !defined(SCM_USE_COPT_THREADS)
/* When we are using non-cooperating threads, we might need to make
sure that the initial values for the slots are protected until
the cell is completely initialized.
"scm_double_cell tried to allocate a marked cell.\n");
abort();
}
-
- SCM_SET_GC_MARK (z);
}
+
+ /* see above. */
+ SCM_SET_GC_MARK (z);
+
+#endif
+
+ /* When this function is inlined, it's possible that the last
+ SCM_GC_SET_CELL_WORD above will be adjacent to a following
+ initialization of z. E.g., it occurred in scm_make_real. GCC
+ from around version 3 (e.g., certainly 3.2) began taking
+ advantage of strict C aliasing rules which say that it's OK to
+ interchange the initialization above and the one below when the
+ pointer types appear to differ sufficiently. We don't want that,
+ of course. GCC allows this behaviour to be disabled with the
+ -fno-strict-aliasing option, but would also need to be supplied
+ by Guile users. Instead, the following statements prevent the
+ reordering.
+ */
+#ifdef __GNUC__
+ asm volatile ("" : : : "memory");
+#else
+ /* portable version, just in case any other compiler does the same
+ thing. */
+ scm_remember_upto_here_1 (z);
#endif
return z;
HCoop / bpt / guile.git / blobdiff