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16ea9620 MV |
1 | /* classes: h_files */ |
2 | ||
3 | #ifndef SCM_INLINE_H | |
4 | #define SCM_INLINE_H | |
5 | ||
3f520967 | 6 | /* Copyright (C) 2001, 2002, 2003, 2004, 2006, 2008 Free Software Foundation, Inc. |
16ea9620 | 7 | * |
73be1d9e MV |
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. | |
16ea9620 | 12 | * |
73be1d9e | 13 | * This library is distributed in the hope that it will be useful, |
16ea9620 | 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
73be1d9e MV |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
16 | * Lesser General Public License for more details. | |
16ea9620 | 17 | * |
73be1d9e MV |
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 | |
92205699 | 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
73be1d9e | 21 | */ |
16ea9620 MV |
22 | |
23 | /* This file is for inline functions. On platforms that don't support | |
24 | inlining functions, they are turned into ordinary functions. See | |
25 | "inline.c". | |
26 | */ | |
27 | ||
60e7529a | 28 | #include "libguile/__scm.h" |
c8a1bdc4 | 29 | |
1e71eafb HWN |
30 | #if (SCM_DEBUG_CELL_ACCESSES == 1) |
31 | #include <stdio.h> | |
1e71eafb HWN |
32 | #endif |
33 | ||
16ea9620 MV |
34 | #include "libguile/pairs.h" |
35 | #include "libguile/gc.h" | |
9bc4701c | 36 | #include "libguile/threads.h" |
9598a406 | 37 | #include "libguile/unif.h" |
d5ad4aa6 | 38 | #include "libguile/pairs.h" |
16ea9620 | 39 | |
c8a1bdc4 | 40 | |
979eade6 LC |
41 | #ifndef SCM_INLINE_C_INCLUDING_INLINE_H |
42 | ||
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 . | |
48 | ||
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 | |
7dc9ae71 | 51 | `__gnu_inline__' is not used. |
979eade6 | 52 | |
7dc9ae71 LC |
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. */ | |
56 | ||
57 | # if (defined __GNUC__) && (!(__APPLE_CC__ > 5400 && __STDC_VERSION__ >= 199901L)) | |
07db6fcd | 58 | # define SCM_C_USE_EXTERN_INLINE 1 |
979eade6 LC |
59 | # if (defined __GNUC_STDC_INLINE__) || (__GNUC__ == 4 && __GNUC_MINOR__ == 2) |
60 | # define SCM_C_EXTERN_INLINE \ | |
61 | extern __inline__ __attribute__ ((__gnu_inline__)) | |
62 | # else | |
63 | # define SCM_C_EXTERN_INLINE extern __inline__ | |
64 | # endif | |
65 | # elif (defined SCM_C_INLINE) | |
66 | # define SCM_C_EXTERN_INLINE static SCM_C_INLINE | |
67 | # endif | |
68 | ||
69 | #endif /* SCM_INLINE_C_INCLUDING_INLINE_H */ | |
70 | ||
71 | ||
07db6fcd LC |
72 | #if (!defined SCM_C_INLINE) || (defined SCM_INLINE_C_INCLUDING_INLINE_H) \ |
73 | || (defined SCM_C_USE_EXTERN_INLINE) | |
3f520967 LC |
74 | |
75 | /* The `extern' declarations. They should only appear when used from | |
07db6fcd LC |
76 | "inline.c", when `inline' is not supported at all or when "extern inline" |
77 | is used. */ | |
3f520967 | 78 | |
c8a1bdc4 HWN |
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); | |
82 | ||
9598a406 MV |
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); | |
16ea9620 | 85 | |
3f520967 LC |
86 | SCM_API int scm_is_pair (SCM x); |
87 | ||
88 | #endif | |
89 | ||
60e7529a | 90 | |
9dca8935 | 91 | #if defined SCM_C_EXTERN_INLINE || defined SCM_INLINE_C_INCLUDING_INLINE_H |
60e7529a RB |
92 | /* either inlining, or being included from inline.c. We use (and |
93 | repeat) this long #if test here and below so that we don't have to | |
94 | introduce any extraneous symbols into the public namespace. We | |
95 | only need SCM_C_INLINE to be seen publically . */ | |
c8a1bdc4 HWN |
96 | |
97 | extern unsigned scm_newcell2_count; | |
98 | extern unsigned scm_newcell_count; | |
99 | ||
979eade6 | 100 | |
9dca8935 | 101 | #ifndef SCM_INLINE_C_INCLUDING_INLINE_H |
979eade6 | 102 | SCM_C_EXTERN_INLINE |
60e7529a | 103 | #endif |
c8a1bdc4 | 104 | SCM |
228a24ef | 105 | scm_cell (scm_t_bits car, scm_t_bits cdr) |
16ea9620 MV |
106 | { |
107 | SCM z; | |
9bc4701c | 108 | SCM *freelist = SCM_FREELIST_LOC (scm_i_freelist); |
16ea9620 | 109 | |
d2e53ed6 | 110 | if (scm_is_null (*freelist)) |
9bc4701c | 111 | z = scm_gc_for_newcell (&scm_i_master_freelist, freelist); |
c8a1bdc4 | 112 | else |
16ea9620 | 113 | { |
9bc4701c MD |
114 | z = *freelist; |
115 | *freelist = SCM_FREE_CELL_CDR (*freelist); | |
16ea9620 | 116 | } |
c8a1bdc4 HWN |
117 | |
118 | /* | |
119 | We update scm_cells_allocated from this function. If we don't | |
120 | update this explicitly, we will have to walk a freelist somewhere | |
121 | later on, which seems a lot more expensive. | |
122 | */ | |
123 | scm_cells_allocated += 1; | |
124 | ||
125 | #if (SCM_DEBUG_CELL_ACCESSES == 1) | |
126 | if (scm_debug_cell_accesses_p) | |
1e71eafb HWN |
127 | { |
128 | if (SCM_GC_MARK_P (z)) | |
129 | { | |
130 | fprintf(stderr, "scm_cell tried to allocate a marked cell.\n"); | |
131 | abort(); | |
132 | } | |
6b69393d | 133 | else if (SCM_GC_CELL_WORD(z, 0) != scm_tc_free_cell) |
1e71eafb HWN |
134 | { |
135 | fprintf(stderr, "cell from freelist is not a free cell.\n"); | |
136 | abort(); | |
137 | } | |
138 | } | |
139 | ||
140 | /* | |
141 | Always set mark. Otherwise cells that are alloced before | |
142 | scm_debug_cell_accesses_p is toggled seem invalid. | |
143 | */ | |
144 | SCM_SET_GC_MARK (z); | |
145 | ||
146 | /* | |
147 | TODO: figure out if this use of mark bits is valid with | |
148 | threading. What if another thread is doing GC at this point | |
149 | ... ? | |
150 | */ | |
c8a1bdc4 | 151 | |
c8a1bdc4 | 152 | #endif |
16ea9620 | 153 | |
c8a1bdc4 | 154 | |
16ea9620 MV |
155 | /* Initialize the type slot last so that the cell is ignored by the |
156 | GC until it is completely initialized. This is only relevant | |
b2a339f6 MV |
157 | when the GC can actually run during this code, which it can't |
158 | since the GC only runs when all other threads are stopped. | |
16ea9620 | 159 | */ |
1fc8902f DH |
160 | SCM_GC_SET_CELL_WORD (z, 1, cdr); |
161 | SCM_GC_SET_CELL_WORD (z, 0, car); | |
16ea9620 | 162 | |
eab1b259 HWN |
163 | #if (SCM_DEBUG_CELL_ACCESSES == 1) |
164 | if (scm_expensive_debug_cell_accesses_p ) | |
165 | scm_i_expensive_validation_check (z); | |
166 | #endif | |
c8a1bdc4 | 167 | |
16ea9620 MV |
168 | return z; |
169 | } | |
170 | ||
9dca8935 | 171 | #ifndef SCM_INLINE_C_INCLUDING_INLINE_H |
979eade6 | 172 | SCM_C_EXTERN_INLINE |
60e7529a | 173 | #endif |
c8a1bdc4 | 174 | SCM |
228a24ef DH |
175 | scm_double_cell (scm_t_bits car, scm_t_bits cbr, |
176 | scm_t_bits ccr, scm_t_bits cdr) | |
16ea9620 | 177 | { |
5e1e20c8 MV |
178 | SCM z; |
179 | SCM *freelist = SCM_FREELIST_LOC (scm_i_freelist2); | |
180 | ||
d2e53ed6 | 181 | if (scm_is_null (*freelist)) |
9bc4701c | 182 | z = scm_gc_for_newcell (&scm_i_master_freelist2, freelist); |
16ea9620 MV |
183 | else |
184 | { | |
9bc4701c MD |
185 | z = *freelist; |
186 | *freelist = SCM_FREE_CELL_CDR (*freelist); | |
16ea9620 MV |
187 | } |
188 | ||
c8a1bdc4 HWN |
189 | scm_cells_allocated += 2; |
190 | ||
16ea9620 MV |
191 | /* Initialize the type slot last so that the cell is ignored by the |
192 | GC until it is completely initialized. This is only relevant | |
b2a339f6 MV |
193 | when the GC can actually run during this code, which it can't |
194 | since the GC only runs when all other threads are stopped. | |
16ea9620 | 195 | */ |
1fc8902f DH |
196 | SCM_GC_SET_CELL_WORD (z, 1, cbr); |
197 | SCM_GC_SET_CELL_WORD (z, 2, ccr); | |
198 | SCM_GC_SET_CELL_WORD (z, 3, cdr); | |
199 | SCM_GC_SET_CELL_WORD (z, 0, car); | |
16ea9620 | 200 | |
c8a1bdc4 HWN |
201 | #if (SCM_DEBUG_CELL_ACCESSES == 1) |
202 | if (scm_debug_cell_accesses_p) | |
203 | { | |
204 | if (SCM_GC_MARK_P (z)) | |
205 | { | |
206 | fprintf(stderr, | |
207 | "scm_double_cell tried to allocate a marked cell.\n"); | |
208 | abort(); | |
209 | } | |
c8a1bdc4 | 210 | } |
4ad0814a HWN |
211 | |
212 | /* see above. */ | |
213 | SCM_SET_GC_MARK (z); | |
214 | ||
3553e1d1 GH |
215 | #endif |
216 | ||
217 | /* When this function is inlined, it's possible that the last | |
218 | SCM_GC_SET_CELL_WORD above will be adjacent to a following | |
219 | initialization of z. E.g., it occurred in scm_make_real. GCC | |
220 | from around version 3 (e.g., certainly 3.2) began taking | |
221 | advantage of strict C aliasing rules which say that it's OK to | |
222 | interchange the initialization above and the one below when the | |
223 | pointer types appear to differ sufficiently. We don't want that, | |
224 | of course. GCC allows this behaviour to be disabled with the | |
225 | -fno-strict-aliasing option, but would also need to be supplied | |
226 | by Guile users. Instead, the following statements prevent the | |
227 | reordering. | |
228 | */ | |
229 | #ifdef __GNUC__ | |
cb975c21 | 230 | __asm__ volatile ("" : : : "memory"); |
3553e1d1 GH |
231 | #else |
232 | /* portable version, just in case any other compiler does the same | |
233 | thing. */ | |
234 | scm_remember_upto_here_1 (z); | |
c8a1bdc4 | 235 | #endif |
6253f3f1 | 236 | |
c8a1bdc4 HWN |
237 | return z; |
238 | } | |
6253f3f1 | 239 | |
9dca8935 | 240 | #ifndef SCM_INLINE_C_INCLUDING_INLINE_H |
979eade6 | 241 | SCM_C_EXTERN_INLINE |
9598a406 MV |
242 | #endif |
243 | SCM | |
244 | scm_array_handle_ref (scm_t_array_handle *h, ssize_t p) | |
245 | { | |
246 | return h->ref (h, p); | |
247 | } | |
eab1b259 | 248 | |
9dca8935 | 249 | #ifndef SCM_INLINE_C_INCLUDING_INLINE_H |
979eade6 | 250 | SCM_C_EXTERN_INLINE |
9598a406 MV |
251 | #endif |
252 | void | |
253 | scm_array_handle_set (scm_t_array_handle *h, ssize_t p, SCM v) | |
254 | { | |
255 | h->set (h, p, v); | |
256 | } | |
eab1b259 | 257 | |
9dca8935 | 258 | #ifndef SCM_INLINE_C_INCLUDING_INLINE_H |
979eade6 | 259 | SCM_C_EXTERN_INLINE |
d5ad4aa6 MV |
260 | #endif |
261 | int | |
262 | scm_is_pair (SCM x) | |
263 | { | |
23f2b9a3 KR |
264 | /* The following "workaround_for_gcc_295" avoids bad code generated by |
265 | i386 gcc 2.95.4 (the Debian packaged 2.95.4-24 at least). | |
266 | ||
267 | Under the default -O2 the inlined SCM_I_CONSP test gets "optimized" so | |
268 | the fetch of the tag word from x is done before confirming it's a | |
269 | non-immediate (SCM_NIMP). Needless to say that bombs badly if x is a | |
270 | immediate. This was seen to afflict scm_srfi1_split_at and something | |
271 | deep in the bowels of ceval(). In both cases segvs resulted from | |
272 | deferencing a random immediate value. srfi-1.test exposes the problem | |
273 | through a short list, the immediate being SCM_EOL in that case. | |
274 | Something in syntax.test exposed the ceval() problem. | |
275 | ||
276 | Just "volatile SCM workaround_for_gcc_295 = lst" is enough to avoid the | |
277 | problem, without even using that variable. The "w=w" is just to | |
278 | prevent a warning about it being unused. | |
279 | */ | |
280 | #if defined (__GNUC__) && __GNUC__ == 2 && __GNUC_MINOR__ == 95 | |
281 | volatile SCM workaround_for_gcc_295 = x; | |
282 | workaround_for_gcc_295 = workaround_for_gcc_295; | |
283 | #endif | |
284 | ||
d5ad4aa6 MV |
285 | return SCM_I_CONSP (x); |
286 | } | |
287 | ||
16ea9620 | 288 | #endif |
16ea9620 | 289 | #endif |