| 1 | /* classes: h_files */ |
| 2 | |
| 3 | #ifndef SCM___SCM_H |
| 4 | #define SCM___SCM_H |
| 5 | |
| 6 | /* Copyright (C) 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003, 2006, |
| 7 | * 2007, 2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc. |
| 8 | * |
| 9 | * This library is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU Lesser General Public License |
| 11 | * as published by the Free Software Foundation; either version 3 of |
| 12 | * the License, or (at your option) any later version. |
| 13 | * |
| 14 | * This library is distributed in the hope that it will be useful, but |
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * Lesser General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Lesser General Public |
| 20 | * License along with this library; if not, write to the Free Software |
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 22 | * 02110-1301 USA |
| 23 | */ |
| 24 | |
| 25 | \f |
| 26 | |
| 27 | /********************************************************************** |
| 28 | This file is Guile's central public header. |
| 29 | |
| 30 | When included by other files, this file should preceed any include |
| 31 | other than __scm.h. |
| 32 | |
| 33 | Under *NO* circumstances should new items be added to the global |
| 34 | namespace (via adding #define, typedef, or similar to this file) with |
| 35 | generic names. This usually means that any new names should be |
| 36 | prefixed by either SCM_ or GUILE_. i.e. do *not* #define HAVE_FOO or |
| 37 | SIZEOF_BAR. See configure.in, gen-scmconfig.h.in, and |
| 38 | gen-scmconfig.c for examples of how to properly handle this issue. |
| 39 | The main documentation is in gen-scmconfig.c. |
| 40 | |
| 41 | "What's the difference between _scm.h and __scm.h?" |
| 42 | |
| 43 | _scm.h is not installed; it's only visible to the libguile sources |
| 44 | themselves, and it includes config.h, the private config header. |
| 45 | |
| 46 | __scm.h is installed, and is #included by <libguile.h>. If both |
| 47 | the client and libguile need some piece of information, and it |
| 48 | doesn't fit well into the header file for any particular module, it |
| 49 | should go in __scm.h. __scm.h includes scmconfig.h, the public |
| 50 | config header. |
| 51 | **********************************************************************/ |
| 52 | |
| 53 | /* What did the configure script discover about the outside world? */ |
| 54 | #include "libguile/scmconfig.h" |
| 55 | |
| 56 | \f |
| 57 | |
| 58 | /* {Compiler hints} |
| 59 | * |
| 60 | * The following macros are used to provide additional information for the |
| 61 | * compiler, which may help to do better error checking and code |
| 62 | * optimization. A second benefit of these macros is, that they also provide |
| 63 | * additional information to the developers. |
| 64 | */ |
| 65 | |
| 66 | /* Return true (non-zero) if GCC version MAJ.MIN or later is being used |
| 67 | * (macro taken from glibc.) */ |
| 68 | #if defined __GNUC__ && defined __GNUC_MINOR__ |
| 69 | # define SCM_GNUC_PREREQ(maj, min) \ |
| 70 | ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min)) |
| 71 | #else |
| 72 | # define SCM_GNUC_PREREQ(maj, min) 0 |
| 73 | #endif |
| 74 | |
| 75 | /* The macro SCM_NORETURN indicates that a function will never return. |
| 76 | * Examples: |
| 77 | * 1) int foo (char arg) SCM_NORETURN; |
| 78 | */ |
| 79 | #ifdef __GNUC__ |
| 80 | #define SCM_NORETURN __attribute__ ((__noreturn__)) |
| 81 | #else |
| 82 | #define SCM_NORETURN |
| 83 | #endif |
| 84 | |
| 85 | /* The macro SCM_UNUSED indicates that a function, function argument or |
| 86 | * variable may potentially be unused. |
| 87 | * Examples: |
| 88 | * 1) static int unused_function (char arg) SCM_UNUSED; |
| 89 | * 2) int foo (char unused_argument SCM_UNUSED); |
| 90 | * 3) int unused_variable SCM_UNUSED; |
| 91 | */ |
| 92 | #ifdef __GNUC__ |
| 93 | #define SCM_UNUSED __attribute__ ((unused)) |
| 94 | #else |
| 95 | #define SCM_UNUSED |
| 96 | #endif |
| 97 | |
| 98 | |
| 99 | /* The SCM_EXPECT macros provide branch prediction hints to the compiler. To |
| 100 | * use only in places where the result of the expression under "normal" |
| 101 | * circumstances is known. */ |
| 102 | #if SCM_GNUC_PREREQ (3, 0) |
| 103 | # define SCM_EXPECT __builtin_expect |
| 104 | #else |
| 105 | # define SCM_EXPECT(_expr, _value) (_expr) |
| 106 | #endif |
| 107 | |
| 108 | #define SCM_LIKELY(_expr) SCM_EXPECT ((_expr), 1) |
| 109 | #define SCM_UNLIKELY(_expr) SCM_EXPECT ((_expr), 0) |
| 110 | |
| 111 | /* The SCM_INTERNAL macro makes it possible to explicitly declare a function |
| 112 | * as having "internal" linkage. However our current tack on this problem is |
| 113 | * to use GCC 4's -fvisibility=hidden, making functions internal by default, |
| 114 | * and then SCM_API marks them for export. */ |
| 115 | #define SCM_INTERNAL extern |
| 116 | |
| 117 | /* The SCM_DEPRECATED macro is used in declarations of deprecated functions |
| 118 | * or variables. Defining `SCM_BUILDING_DEPRECATED_CODE' allows deprecated |
| 119 | * functions to be implemented in terms of deprecated functions, and allows |
| 120 | * deprecated functions to be referred to by `scm_c_define_gsubr ()'. */ |
| 121 | #if !defined (SCM_BUILDING_DEPRECATED_CODE) && SCM_GNUC_PREREQ (3, 0) |
| 122 | # define SCM_DEPRECATED SCM_API __attribute__ ((__deprecated__)) |
| 123 | #else |
| 124 | # define SCM_DEPRECATED SCM_API |
| 125 | #endif |
| 126 | |
| 127 | /* The SCM_ALIGNED macro, when defined, can be used to instruct the compiler |
| 128 | * to honor the given alignment constraint. */ |
| 129 | /* Sun Studio supports alignment since Sun Studio 12 */ |
| 130 | #if defined __GNUC__ || (defined( __SUNPRO_C ) && (__SUNPRO_C - 0 >= 0x590)) |
| 131 | # define SCM_ALIGNED(x) __attribute__ ((aligned (x))) |
| 132 | #elif defined __INTEL_COMPILER |
| 133 | # define SCM_ALIGNED(x) __declspec (align (x)) |
| 134 | #else |
| 135 | /* Don't know how to align things. */ |
| 136 | # undef SCM_ALIGNED |
| 137 | #endif |
| 138 | |
| 139 | /* The SCM_MALLOC macro can be used in function declarations to tell the |
| 140 | * compiler that a function may be treated as if any non-NULL pointer it returns |
| 141 | * cannot alias any other pointer valid when the function returns. */ |
| 142 | #if SCM_GNUC_PREREQ (3, 0) |
| 143 | # define SCM_MALLOC __attribute__ ((__malloc__)) |
| 144 | #else |
| 145 | # define SCM_MALLOC |
| 146 | #endif |
| 147 | |
| 148 | \f |
| 149 | |
| 150 | /* SCM_API is a macro prepended to all function and data definitions |
| 151 | which should be exported from libguile. */ |
| 152 | |
| 153 | #if defined BUILDING_LIBGUILE && defined HAVE_VISIBILITY |
| 154 | # define SCM_API extern __attribute__((__visibility__("default"))) |
| 155 | #elif defined BUILDING_LIBGUILE && defined _MSC_VER |
| 156 | # define SCM_API __declspec(dllexport) extern |
| 157 | #elif defined _MSC_VER |
| 158 | # define SCM_API __declspec(dllimport) extern |
| 159 | #else |
| 160 | # define SCM_API extern |
| 161 | #endif |
| 162 | |
| 163 | \f |
| 164 | |
| 165 | /* We would like gnu89 extern inline semantics, not C99 extern inline |
| 166 | semantics, so that we can be sure to avoid reifying definitions of |
| 167 | inline functions in all compilation units, which is a possibility at |
| 168 | low optimization levels, or if a user takes the address of an inline |
| 169 | function. |
| 170 | |
| 171 | Hence the `__gnu_inline__' attribute, in accordance with: |
| 172 | http://gcc.gnu.org/gcc-4.3/porting_to.html . |
| 173 | |
| 174 | With GCC 4.2, `__GNUC_STDC_INLINE__' is never defined (because C99 inline |
| 175 | semantics are not supported), but a warning is issued in C99 mode if |
| 176 | `__gnu_inline__' is not used. |
| 177 | |
| 178 | Apple's GCC build >5400 (since Xcode 3.0) doesn't support GNU inline in |
| 179 | C99 mode and doesn't define `__GNUC_STDC_INLINE__'. Fall back to "static |
| 180 | inline" in that case. */ |
| 181 | |
| 182 | # if (defined __GNUC__) && (!(((defined __APPLE_CC__) && (__APPLE_CC__ > 5400)) && __STDC_VERSION__ >= 199901L)) |
| 183 | # if (defined __GNUC_STDC_INLINE__) || (__GNUC__ == 4 && __GNUC_MINOR__ == 2) |
| 184 | # define SCM_C_EXTERN_INLINE \ |
| 185 | extern __inline__ __attribute__ ((__gnu_inline__)) |
| 186 | # else |
| 187 | # define SCM_C_EXTERN_INLINE extern __inline__ |
| 188 | # endif |
| 189 | # endif |
| 190 | |
| 191 | /* SCM_INLINE is a macro prepended to all public inline function |
| 192 | declarations. Implementations of those functions should also be in |
| 193 | the header file, prefixed by SCM_INLINE_IMPLEMENTATION, and protected |
| 194 | by SCM_CAN_INLINE and a CPP define for the C file in question, like |
| 195 | SCM_INLINE_C_INCLUDING_INLINE_H. See inline.h for an example |
| 196 | usage. */ |
| 197 | |
| 198 | #if defined SCM_IMPLEMENT_INLINES |
| 199 | /* Reifying functions to a file, whether or not inlining is available. */ |
| 200 | # define SCM_CAN_INLINE 0 |
| 201 | # define SCM_INLINE SCM_API |
| 202 | # define SCM_INLINE_IMPLEMENTATION |
| 203 | #elif defined SCM_C_INLINE |
| 204 | /* Declarations when inlining is available. */ |
| 205 | # define SCM_CAN_INLINE 1 |
| 206 | # ifdef SCM_C_EXTERN_INLINE |
| 207 | # define SCM_INLINE SCM_C_EXTERN_INLINE |
| 208 | # else |
| 209 | /* Fall back to static inline if GNU "extern inline" is unavailable. */ |
| 210 | # define SCM_INLINE static SCM_C_INLINE |
| 211 | # endif |
| 212 | # define SCM_INLINE_IMPLEMENTATION SCM_INLINE |
| 213 | #else |
| 214 | /* Declarations when inlining is not available. */ |
| 215 | # define SCM_CAN_INLINE 0 |
| 216 | # define SCM_INLINE SCM_API |
| 217 | /* Don't define SCM_INLINE_IMPLEMENTATION; it should never be seen in |
| 218 | this case. */ |
| 219 | #endif |
| 220 | |
| 221 | \f |
| 222 | |
| 223 | /* {Debugging Options} |
| 224 | * |
| 225 | * These compile time options determine whether to include code that is only |
| 226 | * useful for debugging guile itself or C level extensions to guile. The |
| 227 | * common prefix for all option macros of this kind is "SCM_DEBUG_". It is |
| 228 | * guaranteed that a macro named SCM_DEBUG_XXX is always defined (typically to |
| 229 | * either 0 or 1), i. e. there is no need to test for the undefined case. |
| 230 | * This allows to use these definitions comfortably within code, as in the |
| 231 | * following example: |
| 232 | * #define FOO do { if (SCM_DEBUG_XXX) bar(); else baz(); } while (0) |
| 233 | * Any sane compiler will remove the unused branch without any performance |
| 234 | * penalty for the resulting code. |
| 235 | * |
| 236 | * Note: Some SCM_DEBUG_XXX options are not settable at configure time. |
| 237 | * To change the value of such options you will have to edit this header |
| 238 | * file or give suitable options to make, like: |
| 239 | * make all CFLAGS="-DSCM_DEBUG_XXX=1 ..." |
| 240 | */ |
| 241 | |
| 242 | |
| 243 | /* The value of SCM_DEBUG determines the default for most of the not yet |
| 244 | * defined debugging options. This allows, for example, to enable most of the |
| 245 | * debugging options by simply defining SCM_DEBUG as 1. |
| 246 | */ |
| 247 | #ifndef SCM_DEBUG |
| 248 | #define SCM_DEBUG 0 |
| 249 | #endif |
| 250 | |
| 251 | /* If SCM_DEBUG_CELL_ACCESSES is set to 1, cell accesses will perform |
| 252 | * exhaustive parameter checking: It will be verified that cell parameters |
| 253 | * actually point to a valid heap cell. Note: If this option is enabled, |
| 254 | * guile will run about ten times slower than normally. |
| 255 | */ |
| 256 | #ifndef SCM_DEBUG_CELL_ACCESSES |
| 257 | #define SCM_DEBUG_CELL_ACCESSES SCM_DEBUG |
| 258 | #endif |
| 259 | |
| 260 | /* If SCM_DEBUG_PAIR_ACCESSES is set to 1, accesses to cons cells will be |
| 261 | * exhaustively checked. Note: If this option is enabled, guile will run |
| 262 | * slower than normally. |
| 263 | */ |
| 264 | #ifndef SCM_DEBUG_PAIR_ACCESSES |
| 265 | #define SCM_DEBUG_PAIR_ACCESSES SCM_DEBUG |
| 266 | #endif |
| 267 | |
| 268 | /* If SCM_DEBUG_REST_ARGUMENT is set to 1, functions that take rest arguments |
| 269 | * will check whether the rest arguments are actually passed as a proper list. |
| 270 | * Otherwise, if SCM_DEBUG_REST_ARGUMENT is 0, functions that take rest |
| 271 | * arguments will take it for granted that these are passed as a proper list. |
| 272 | */ |
| 273 | #ifndef SCM_DEBUG_REST_ARGUMENT |
| 274 | #define SCM_DEBUG_REST_ARGUMENT SCM_DEBUG |
| 275 | #endif |
| 276 | |
| 277 | /* The macro SCM_DEBUG_TYPING_STRICTNESS indicates what level of type checking |
| 278 | * shall be performed with respect to the use of the SCM datatype. The macro |
| 279 | * may be defined to one of the values 0, 1 and 2. |
| 280 | * |
| 281 | * A value of 0 means that there will be no compile time type checking, since |
| 282 | * the SCM datatype will be declared as an integral type. This setting should |
| 283 | * only be used on systems, where casting from integral types to pointers may |
| 284 | * lead to loss of bit information. |
| 285 | * |
| 286 | * A value of 1 means that there will an intermediate level of compile time |
| 287 | * type checking, since the SCM datatype will be declared as a pointer to an |
| 288 | * undefined struct. This setting is the default, since it does not cost |
| 289 | * anything in terms of performance or code size. |
| 290 | * |
| 291 | * A value of 2 provides a maximum level of compile time type checking since |
| 292 | * the SCM datatype will be declared as a struct. This setting should be used |
| 293 | * for _compile time_ type checking only, since the compiled result is likely |
| 294 | * to be quite inefficient. The right way to make use of this option is to do |
| 295 | * a 'make clean; make CFLAGS=-DSCM_DEBUG_TYPING_STRICTNESS=2', fix your |
| 296 | * errors, and then do 'make clean; make'. |
| 297 | */ |
| 298 | #ifndef SCM_DEBUG_TYPING_STRICTNESS |
| 299 | #define SCM_DEBUG_TYPING_STRICTNESS 1 |
| 300 | #endif |
| 301 | |
| 302 | \f |
| 303 | |
| 304 | /* {Feature Options} |
| 305 | * |
| 306 | * These compile time options determine whether code for certain features |
| 307 | * should be compiled into guile. The common prefix for all option macros |
| 308 | * of this kind is "SCM_ENABLE_". It is guaranteed that a macro named |
| 309 | * SCM_ENABLE_XXX is defined to be either 0 or 1, i. e. there is no need to |
| 310 | * test for the undefined case. This allows to use these definitions |
| 311 | * comfortably within code, as in the following example: |
| 312 | * #define FOO do { if (SCM_ENABLE_XXX) bar(); else baz(); } while (0) |
| 313 | * Any sane compiler will remove the unused branch without any performance |
| 314 | * penalty for the resulting code. |
| 315 | * |
| 316 | * Note: Some SCM_ENABLE_XXX options are not settable at configure time. |
| 317 | * To change the value of such options you will have to edit this header |
| 318 | * file or give suitable options to make, like: |
| 319 | * make all CFLAGS="-DSCM_ENABLE_XXX=1 ..." |
| 320 | */ |
| 321 | |
| 322 | /* If SCM_ENABLE_DEPRECATED is set to 1, deprecated code will be included in |
| 323 | * guile, as well as some functions to issue run-time warnings about uses of |
| 324 | * deprecated functions. |
| 325 | */ |
| 326 | #ifndef SCM_ENABLE_DEPRECATED |
| 327 | #define SCM_ENABLE_DEPRECATED 0 |
| 328 | #endif |
| 329 | |
| 330 | \f |
| 331 | |
| 332 | /* {Architecture and compiler properties} |
| 333 | * |
| 334 | * Guile as of today can only work on systems which fulfill at least the |
| 335 | * following requirements: |
| 336 | * |
| 337 | * - scm_t_bits and SCM variables have at least 32 bits. |
| 338 | * Guile's type system is based on this assumption. |
| 339 | * |
| 340 | * - sizeof (scm_t_bits) >= sizeof (void*) and sizeof (SCM) >= sizeof (void*) |
| 341 | * Guile's type system is based on this assumption, since it must be |
| 342 | * possible to store pointers to cells on the heap in scm_t_bits and SCM |
| 343 | * variables. |
| 344 | * |
| 345 | * - sizeof (scm_t_bits) >= 4 and sizeof (scm_t_bits) is a power of 2. |
| 346 | * Guile's type system is based on this assumption. In particular, it is |
| 347 | * assumed that cells, i. e. pairs of scm_t_bits variables, are eight |
| 348 | * character aligned. This is because three bits of a scm_t_bits variable |
| 349 | * that is holding a pointer to a cell on the heap must be available for |
| 350 | * storing type data. |
| 351 | * |
| 352 | * - sizeof (scm_t_bits) <= sizeof (void*) and sizeof (SCM) <= sizeof (void*) |
| 353 | * In some parts of guile, scm_t_bits and SCM variables are passed to |
| 354 | * functions as void* arguments. Together with the requirement above, this |
| 355 | * requires a one-to-one correspondence between the size of a void* and the |
| 356 | * sizes of scm_t_bits and SCM variables. |
| 357 | * |
| 358 | * - numbers are encoded using two's complement. |
| 359 | * The implementation of the bitwise scheme level operations is based on |
| 360 | * this assumption. |
| 361 | * |
| 362 | * - ... add more |
| 363 | */ |
| 364 | |
| 365 | #ifdef CHAR_BIT |
| 366 | # define SCM_CHAR_BIT CHAR_BIT |
| 367 | #else |
| 368 | # define SCM_CHAR_BIT 8 |
| 369 | #endif |
| 370 | |
| 371 | #ifdef LONG_BIT |
| 372 | # define SCM_LONG_BIT LONG_BIT |
| 373 | #else |
| 374 | # define SCM_LONG_BIT (SCM_SIZEOF_LONG * 8) |
| 375 | #endif |
| 376 | |
| 377 | #define SCM_I_UTYPE_MAX(type) ((type)-1) |
| 378 | #define SCM_I_TYPE_MAX(type,umax) ((type)((umax)/2)) |
| 379 | #define SCM_I_TYPE_MIN(type,umax) (-((type)((umax)/2))-1) |
| 380 | |
| 381 | #define SCM_T_UINT8_MAX SCM_I_UTYPE_MAX(scm_t_uint8) |
| 382 | #define SCM_T_INT8_MIN SCM_I_TYPE_MIN(scm_t_int8,SCM_T_UINT8_MAX) |
| 383 | #define SCM_T_INT8_MAX SCM_I_TYPE_MAX(scm_t_int8,SCM_T_UINT8_MAX) |
| 384 | |
| 385 | #define SCM_T_UINT16_MAX SCM_I_UTYPE_MAX(scm_t_uint16) |
| 386 | #define SCM_T_INT16_MIN SCM_I_TYPE_MIN(scm_t_int16,SCM_T_UINT16_MAX) |
| 387 | #define SCM_T_INT16_MAX SCM_I_TYPE_MAX(scm_t_int16,SCM_T_UINT16_MAX) |
| 388 | |
| 389 | #define SCM_T_UINT32_MAX SCM_I_UTYPE_MAX(scm_t_uint32) |
| 390 | #define SCM_T_INT32_MIN SCM_I_TYPE_MIN(scm_t_int32,SCM_T_UINT32_MAX) |
| 391 | #define SCM_T_INT32_MAX SCM_I_TYPE_MAX(scm_t_int32,SCM_T_UINT32_MAX) |
| 392 | |
| 393 | #define SCM_T_UINT64_MAX SCM_I_UTYPE_MAX(scm_t_uint64) |
| 394 | #define SCM_T_INT64_MIN SCM_I_TYPE_MIN(scm_t_int64,SCM_T_UINT64_MAX) |
| 395 | #define SCM_T_INT64_MAX SCM_I_TYPE_MAX(scm_t_int64,SCM_T_UINT64_MAX) |
| 396 | |
| 397 | #define SCM_T_UINTMAX_MAX SCM_I_UTYPE_MAX(scm_t_uintmax) |
| 398 | #define SCM_T_INTMAX_MIN SCM_I_TYPE_MIN(scm_t_intmax,SCM_T_UINTMAX_MAX) |
| 399 | #define SCM_T_INTMAX_MAX SCM_I_TYPE_MAX(scm_t_intmax,SCM_T_UINTMAX_MAX) |
| 400 | |
| 401 | #define SCM_T_UINTPTR_MAX SCM_I_UTYPE_MAX(scm_t_uintptr) |
| 402 | #define SCM_T_INTPTR_MIN SCM_I_TYPE_MIN(scm_t_intptr,SCM_T_UINTPTR_MAX) |
| 403 | #define SCM_T_INTPTR_MAX SCM_I_TYPE_MAX(scm_t_intptr,SCM_T_UINTPTR_MAX) |
| 404 | |
| 405 | \f |
| 406 | |
| 407 | #include "libguile/tags.h" |
| 408 | |
| 409 | |
| 410 | /* The type of subrs, i.e., Scheme procedures implemented in C. Empty |
| 411 | function declarators are used internally for pointers to functions of |
| 412 | any arity. However, these are equivalent to `(void)' in C++, are |
| 413 | obsolescent as of C99, and trigger `strict-prototypes' GCC warnings |
| 414 | (bug #23681). */ |
| 415 | |
| 416 | #ifdef BUILDING_LIBGUILE |
| 417 | typedef SCM (* scm_t_subr) (); |
| 418 | #else |
| 419 | typedef void *scm_t_subr; |
| 420 | #endif |
| 421 | |
| 422 | \f |
| 423 | |
| 424 | /* scm_i_jmp_buf |
| 425 | * |
| 426 | * The corresponding SCM_I_SETJMP and SCM_I_LONGJMP are defined in the |
| 427 | * _scm.h private header. |
| 428 | */ |
| 429 | |
| 430 | #if defined (vms) |
| 431 | typedef int scm_i_jmp_buf[17]; |
| 432 | |
| 433 | #elif defined (_CRAY1) |
| 434 | typedef int scm_i_jmp_buf[112]; |
| 435 | |
| 436 | #elif defined (__ia64__) |
| 437 | # include <signal.h> |
| 438 | # include <ucontext.h> |
| 439 | typedef struct { |
| 440 | ucontext_t ctx; |
| 441 | int fresh; |
| 442 | } scm_i_jmp_buf; |
| 443 | |
| 444 | #else |
| 445 | # include <setjmp.h> |
| 446 | typedef jmp_buf scm_i_jmp_buf; |
| 447 | #endif |
| 448 | |
| 449 | |
| 450 | \f |
| 451 | |
| 452 | /* If stack is not longword aligned then |
| 453 | */ |
| 454 | |
| 455 | /* #define SHORT_ALIGN */ |
| 456 | #ifdef THINK_C |
| 457 | # define SHORT_ALIGN |
| 458 | #endif |
| 459 | #ifdef MSDOS |
| 460 | # define SHORT_ALIGN |
| 461 | #endif |
| 462 | #ifdef atarist |
| 463 | # define SHORT_ALIGN |
| 464 | #endif |
| 465 | |
| 466 | #ifdef SHORT_ALIGN |
| 467 | typedef short SCM_STACKITEM; |
| 468 | #else |
| 469 | typedef long SCM_STACKITEM; |
| 470 | #endif |
| 471 | |
| 472 | /* Cast pointer through (void *) in order to avoid compiler warnings |
| 473 | when strict aliasing is enabled */ |
| 474 | #define SCM_STACK_PTR(ptr) ((SCM_STACKITEM *) (void *) (ptr)) |
| 475 | \f |
| 476 | |
| 477 | #ifdef BUILDING_LIBGUILE |
| 478 | #define SCM_TICK SCM_ASYNC_TICK |
| 479 | #else |
| 480 | #define SCM_TICK scm_async_tick () |
| 481 | #endif |
| 482 | |
| 483 | \f |
| 484 | |
| 485 | #ifndef SCM_MAGIC_SNARFER |
| 486 | /* Let these macros pass through if |
| 487 | we are snarfing; thus we can tell the |
| 488 | difference between the use of an actual |
| 489 | number vs. the use of one of these macros -- |
| 490 | actual numbers in SCM_VALIDATE_* and SCM_ASSERT |
| 491 | constructs must match the formal argument name, |
| 492 | but using SCM_ARG* avoids the test */ |
| 493 | |
| 494 | #define SCM_ARGn 0 |
| 495 | #define SCM_ARG1 1 |
| 496 | #define SCM_ARG2 2 |
| 497 | #define SCM_ARG3 3 |
| 498 | #define SCM_ARG4 4 |
| 499 | #define SCM_ARG5 5 |
| 500 | #define SCM_ARG6 6 |
| 501 | #define SCM_ARG7 7 |
| 502 | |
| 503 | #endif /* SCM_MAGIC_SNARFER */ |
| 504 | |
| 505 | \f |
| 506 | |
| 507 | /* Define SCM_C_INLINE_KEYWORD so that it can be used as a replacement |
| 508 | for the "inline" keyword, expanding to nothing when "inline" is not |
| 509 | available. |
| 510 | */ |
| 511 | |
| 512 | #ifdef SCM_C_INLINE |
| 513 | #define SCM_C_INLINE_KEYWORD SCM_C_INLINE |
| 514 | #else |
| 515 | #define SCM_C_INLINE_KEYWORD |
| 516 | #endif |
| 517 | |
| 518 | /* Handling thread-local storage (TLS). */ |
| 519 | |
| 520 | #ifdef SCM_HAVE_THREAD_STORAGE_CLASS |
| 521 | # define SCM_THREAD_LOCAL __thread |
| 522 | #else |
| 523 | # define SCM_THREAD_LOCAL |
| 524 | #endif |
| 525 | |
| 526 | #endif /* SCM___SCM_H */ |
| 527 | |
| 528 | /* |
| 529 | Local Variables: |
| 530 | c-file-style: "gnu" |
| 531 | End: |
| 532 | */ |