6 /* Copyright (C) 2001, 2002, 2003, 2004, 2006, 2008 Free Software Foundation, Inc.
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 /* This file is for inline functions. On platforms that don't support
24 inlining functions, they are turned into ordinary functions. See
31 #include "libguile/__scm.h"
33 #include "libguile/pairs.h"
34 #include "libguile/gc.h"
35 #include "libguile/threads.h"
36 #include "libguile/unif.h"
37 #include "libguile/ports.h"
38 #include "libguile/error.h"
41 #ifndef SCM_INLINE_C_INCLUDING_INLINE_H
43 /* GCC has `__inline__' in all modes, including strict ansi. GCC 4.3 and
44 above with `-std=c99' or `-std=gnu99' implements ISO C99 inline semantics,
45 unless `-fgnu89-inline' is used. Here we want GNU "extern inline"
46 semantics, hence the `__gnu_inline__' attribute, in accordance with:
47 http://gcc.gnu.org/gcc-4.3/porting_to.html .
49 With GCC 4.2, `__GNUC_STDC_INLINE__' is never defined (because C99 inline
50 semantics are not supported), but a warning is issued in C99 mode if
51 `__gnu_inline__' is not used.
53 Apple's GCC build >5400 (since Xcode 3.0) doesn't support GNU inline in
54 C99 mode and doesn't define `__GNUC_STDC_INLINE__'. Fall back to "static
55 inline" in that case. */
57 # if (defined __GNUC__) && (!(((defined __APPLE_CC__) && (__APPLE_CC__ > 5400)) && __STDC_VERSION__ >= 199901L))
58 # define SCM_C_USE_EXTERN_INLINE 1
59 # if (defined __GNUC_STDC_INLINE__) || (__GNUC__ == 4 && __GNUC_MINOR__ == 2)
60 # define SCM_C_EXTERN_INLINE \
61 extern __inline__ __attribute__ ((__gnu_inline__))
63 # define SCM_C_EXTERN_INLINE extern __inline__
65 # elif (defined SCM_C_INLINE)
66 # define SCM_C_EXTERN_INLINE static SCM_C_INLINE
69 #endif /* SCM_INLINE_C_INCLUDING_INLINE_H */
72 #if (!defined SCM_C_INLINE) || (defined SCM_INLINE_C_INCLUDING_INLINE_H) \
73 || (defined SCM_C_USE_EXTERN_INLINE)
75 /* The `extern' declarations. They should only appear when used from
76 "inline.c", when `inline' is not supported at all or when "extern inline"
79 SCM_API SCM scm_cell (scm_t_bits car, scm_t_bits cdr);
80 SCM_API SCM scm_double_cell (scm_t_bits car, scm_t_bits cbr,
81 scm_t_bits ccr, scm_t_bits cdr);
83 SCM_API SCM scm_array_handle_ref (scm_t_array_handle *h, ssize_t pos);
84 SCM_API void scm_array_handle_set (scm_t_array_handle *h, ssize_t pos, SCM val);
86 SCM_API int scm_is_pair (SCM x);
88 SCM_API int scm_getc (SCM port);
89 SCM_API void scm_putc (char c, SCM port);
90 SCM_API void scm_puts (const char *str_data, SCM port);
95 #if defined SCM_C_EXTERN_INLINE || defined SCM_INLINE_C_INCLUDING_INLINE_H
96 /* either inlining, or being included from inline.c. We use (and
97 repeat) this long #if test here and below so that we don't have to
98 introduce any extraneous symbols into the public namespace. We
99 only need SCM_C_INLINE to be seen publically . */
101 extern unsigned scm_newcell2_count;
102 extern unsigned scm_newcell_count;
105 #ifndef SCM_INLINE_C_INCLUDING_INLINE_H
109 scm_cell (scm_t_bits car, scm_t_bits cdr)
113 SCM *freelist = SCM_FREELIST_LOC (*scm_i_freelist_ptr);
115 SCM *freelist = SCM_FREELIST_LOC (scm_i_freelist);
118 if (scm_is_null (*freelist))
120 z = scm_gc_for_newcell (scm_i_master_freelist_ptr, freelist);
122 z = scm_gc_for_newcell (&scm_i_master_freelist, freelist);
127 *freelist = SCM_FREE_CELL_CDR (*freelist);
131 We update scm_cells_allocated from this function. If we don't
132 update this explicitly, we will have to walk a freelist somewhere
133 later on, which seems a lot more expensive.
135 scm_cells_allocated += 1;
137 #if (SCM_DEBUG_CELL_ACCESSES == 1)
138 if (scm_debug_cell_accesses_p)
140 if (SCM_GC_MARK_P (z))
142 fprintf(stderr, "scm_cell tried to allocate a marked cell.\n");
145 else if (SCM_GC_CELL_WORD(z, 0) != scm_tc_free_cell)
147 fprintf(stderr, "cell from freelist is not a free cell.\n");
153 Always set mark. Otherwise cells that are alloced before
154 scm_debug_cell_accesses_p is toggled seem invalid.
159 TODO: figure out if this use of mark bits is valid with
160 threading. What if another thread is doing GC at this point
167 /* Initialize the type slot last so that the cell is ignored by the
168 GC until it is completely initialized. This is only relevant
169 when the GC can actually run during this code, which it can't
170 since the GC only runs when all other threads are stopped.
172 SCM_GC_SET_CELL_WORD (z, 1, cdr);
173 SCM_GC_SET_CELL_WORD (z, 0, car);
175 #if (SCM_DEBUG_CELL_ACCESSES == 1)
176 if (scm_expensive_debug_cell_accesses_p )
177 scm_i_expensive_validation_check (z);
183 #ifndef SCM_INLINE_C_INCLUDING_INLINE_H
187 scm_double_cell (scm_t_bits car, scm_t_bits cbr,
188 scm_t_bits ccr, scm_t_bits cdr)
192 SCM *freelist = SCM_FREELIST_LOC (*scm_i_freelist2_ptr);
194 SCM *freelist = SCM_FREELIST_LOC (scm_i_freelist2);
197 if (scm_is_null (*freelist))
199 z = scm_gc_for_newcell (scm_i_master_freelist2_ptr, freelist);
201 z = scm_gc_for_newcell (&scm_i_master_freelist2, freelist);
206 *freelist = SCM_FREE_CELL_CDR (*freelist);
209 scm_cells_allocated += 2;
211 /* Initialize the type slot last so that the cell is ignored by the
212 GC until it is completely initialized. This is only relevant
213 when the GC can actually run during this code, which it can't
214 since the GC only runs when all other threads are stopped.
216 SCM_GC_SET_CELL_WORD (z, 1, cbr);
217 SCM_GC_SET_CELL_WORD (z, 2, ccr);
218 SCM_GC_SET_CELL_WORD (z, 3, cdr);
219 SCM_GC_SET_CELL_WORD (z, 0, car);
221 #if (SCM_DEBUG_CELL_ACCESSES == 1)
222 if (scm_debug_cell_accesses_p)
224 if (SCM_GC_MARK_P (z))
227 "scm_double_cell tried to allocate a marked cell.\n");
237 /* When this function is inlined, it's possible that the last
238 SCM_GC_SET_CELL_WORD above will be adjacent to a following
239 initialization of z. E.g., it occurred in scm_make_real. GCC
240 from around version 3 (e.g., certainly 3.2) began taking
241 advantage of strict C aliasing rules which say that it's OK to
242 interchange the initialization above and the one below when the
243 pointer types appear to differ sufficiently. We don't want that,
244 of course. GCC allows this behaviour to be disabled with the
245 -fno-strict-aliasing option, but would also need to be supplied
246 by Guile users. Instead, the following statements prevent the
250 __asm__ volatile ("" : : : "memory");
252 /* portable version, just in case any other compiler does the same
254 scm_remember_upto_here_1 (z);
260 #ifndef SCM_INLINE_C_INCLUDING_INLINE_H
264 scm_array_handle_ref (scm_t_array_handle *h, ssize_t p)
266 return h->ref (h, p);
269 #ifndef SCM_INLINE_C_INCLUDING_INLINE_H
273 scm_array_handle_set (scm_t_array_handle *h, ssize_t p, SCM v)
278 #ifndef SCM_INLINE_C_INCLUDING_INLINE_H
284 /* The following "workaround_for_gcc_295" avoids bad code generated by
285 i386 gcc 2.95.4 (the Debian packaged 2.95.4-24 at least).
287 Under the default -O2 the inlined SCM_I_CONSP test gets "optimized" so
288 the fetch of the tag word from x is done before confirming it's a
289 non-immediate (SCM_NIMP). Needless to say that bombs badly if x is a
290 immediate. This was seen to afflict scm_srfi1_split_at and something
291 deep in the bowels of ceval(). In both cases segvs resulted from
292 deferencing a random immediate value. srfi-1.test exposes the problem
293 through a short list, the immediate being SCM_EOL in that case.
294 Something in syntax.test exposed the ceval() problem.
296 Just "volatile SCM workaround_for_gcc_295 = lst" is enough to avoid the
297 problem, without even using that variable. The "w=w" is just to
298 prevent a warning about it being unused.
300 #if defined (__GNUC__) && __GNUC__ == 2 && __GNUC_MINOR__ == 95
301 volatile SCM workaround_for_gcc_295 = x;
302 workaround_for_gcc_295 = workaround_for_gcc_295;
305 return SCM_I_CONSP (x);
311 #ifndef SCM_INLINE_C_INCLUDING_INLINE_H
318 scm_t_port *pt = SCM_PTAB_ENTRY (port);
320 if (pt->rw_active == SCM_PORT_WRITE)
321 /* may be marginally faster than calling scm_flush. */
322 scm_ptobs[SCM_PTOBNUM (port)].flush (port);
325 pt->rw_active = SCM_PORT_READ;
327 if (pt->read_pos >= pt->read_end)
329 if (scm_fill_input (port) == EOF)
333 c = *(pt->read_pos++);
359 #ifndef SCM_INLINE_C_INCLUDING_INLINE_H
363 scm_putc (char c, SCM port)
365 SCM_ASSERT_TYPE (SCM_OPOUTPORTP (port), port, 0, NULL, "output port");
366 scm_lfwrite (&c, 1, port);
369 #ifndef SCM_INLINE_C_INCLUDING_INLINE_H
373 scm_puts (const char *s, SCM port)
375 SCM_ASSERT_TYPE (SCM_OPOUTPORTP (port), port, 0, NULL, "output port");
376 scm_lfwrite (s, strlen (s), port);