src/runtime/runtime.h

   1 /*
   2  * This software is part of the SBCL system. See the README file for
   3  * more information.
   4  *
   5  * This software is derived from the CMU CL system, which was
   6  * written at Carnegie Mellon University and released into the
   7  * public domain. The software is in the public domain and is
   8  * provided with absolutely no warranty. See the COPYING and CREDITS
   9  * files for more information.
  10  */
  11
  12 /* FIXME: Aren't symbols with underscore prefixes supposed to be
  13  * reserved for system libraries? Perhaps rename stuff like this
  14  * to names like INCLUDED_SBCL_RUNTIME_H. */
  15 #ifndef _SBCL_RUNTIME_H_
  16 #define _SBCL_RUNTIME_H_
  17
  18 #if defined(LISP_FEATURE_SB_THREAD)
  19 #define thread_self() pthread_self()
  20 #define thread_kill pthread_kill
  21 #define thread_sigmask pthread_sigmask
  22 #define thread_mutex_lock(l) pthread_mutex_lock(l)
  23 #define thread_mutex_unlock(l) pthread_mutex_unlock(l)
  24 #else
  25 #define thread_self() 0
  26 #define thread_kill kill_safely
  27 #define thread_sigmask sigprocmask
  28 #define thread_mutex_lock(l) 0
  29 #define thread_mutex_unlock(l) 0
  30 #endif
  31
  32 /* Block blockable interrupts for each SHOW, if not 0. */
  33 #define QSHOW_SIGNAL_SAFE 1
  34 /* Enable extra-verbose low-level debugging output for signals? (You
  35  * probably don't want this unless you're trying to debug very early
  36  * cold boot on a new machine, or one where you've just messed up
  37  * signal handling.)
  38  *
  39  * Note: It may be that doing this is fundamentally unsound, since it
  40  * causes output from signal handlers, and the i/o libraries aren't
  41  * necessarily reentrant. But it can still be very convenient for
  42  * figuring out what's going on when you have a signal handling
  43  * problem. */
  44 #define QSHOW_SIGNALS 0
  45 /* Enable low-level debugging output, if not zero. Defaults to enabled
  46  * if QSHOW_SIGNALS, disabled otherwise. Change it to 1 if you want
  47  * low-level debugging output but not the whole signal mess. */
  48 #define QSHOW QSHOW_SIGNALS
  49
  50 #if QSHOW
  51
  52 #if QSHOW_SIGNAL_SAFE == 1 && !defined(LISP_FEATURE_WIN32)
  53
  54 #include <signal.h>
  55 extern sigset_t blockable_sigset;
  56
  57 #define QSHOW_BLOCK                                             \
  58         sigset_t oldset;                                        \
  59         thread_sigmask(SIG_BLOCK, &blockable_sigset, &oldset);
  60 #define QSHOW_UNBLOCK thread_sigmask(SIG_SETMASK,&oldset,0);
  61 #else
  62 #define QSHOW_BLOCK
  63 #define QSHOW_UNBLOCK
  64 #endif
  65
  66 #ifdef LISP_FEATURE_SB_THREAD
  67 #define QSHOW_PREFIX fprintf(stderr, "%lu ", pthread_self());
  68 #else
  69 #define QSHOW_PREFIX
  70 #endif
  71
  72 #define FSHOW(args)                                             \
  73     do {                                                        \
  74         QSHOW_BLOCK                                             \
  75         QSHOW_PREFIX                                            \
  76         fprintf args;                                           \
  77         QSHOW_UNBLOCK                                           \
  78     } while (0)
  79 #define SHOW(string) FSHOW((stderr, "/%s\n", string))
  80
  81 #else
  82
  83 #define FSHOW(args)
  84 #define SHOW(string)
  85
  86 #endif
  87
  88 #if QSHOW_SIGNALS
  89 #define FSHOW_SIGNAL FSHOW
  90 #else
  91 #define FSHOW_SIGNAL(args)
  92 #endif
  93
  94 /* KLUDGE: These are in theory machine-dependent and OS-dependent, but
  95  * in practice the "foo int" definitions work for all the machines
  96  * that SBCL runs on as of 0.6.7. If we port to the Alpha or some
  97  * other non-32-bit machine we'll probably need real machine-dependent
  98  * and OS-dependent definitions again. */
  99 /* even on alpha, int happens to be 4 bytes.  long is longer. */
 100 /* FIXME: these names really shouldn't reflect their length and this
 101    is not quite right for some of the FFI stuff */
 102 typedef unsigned long u64;
 103 typedef signed long s64;
 104 typedef unsigned int u32;
 105 typedef signed int s32;
 106
 107 /* this is an integral type the same length as a machine pointer */
 108 typedef unsigned long pointer_sized_uint_t ;
 109
 110 #include <sys/types.h>
 111
 112 #if defined(LISP_FEATURE_SB_THREAD)
 113 #include <pthread.h>
 114 typedef pthread_t os_thread_t;
 115 #else
 116 typedef pid_t os_thread_t;
 117 #endif
 118
 119 /* FIXME: we do things this way because of the alpha32 port.  once
 120    alpha64 has arrived, all this nastiness can go away */
 121 #if 64 == N_WORD_BITS
 122 #define LOW_WORD(c) ((pointer_sized_uint_t)c)
 123 typedef unsigned long lispobj;
 124 #else
 125 #define LOW_WORD(c) ((long)(c) & 0xFFFFFFFFL)
 126 /* fake it on alpha32 */
 127 typedef unsigned int lispobj;
 128 #endif
 129
 130 static inline int
 131 lowtag_of(lispobj obj)
 132 {
 133     return obj & LOWTAG_MASK;
 134 }
 135
 136 static inline int
 137 widetag_of(lispobj obj)
 138 {
 139     return obj & WIDETAG_MASK;
 140 }
 141
 142 static inline unsigned long
 143 HeaderValue(lispobj obj)
 144 {
 145   return obj >> N_WIDETAG_BITS;
 146 }
 147
 148 static inline struct cons *
 149 CONS(lispobj obj)
 150 {
 151   return (struct cons *)(obj - LIST_POINTER_LOWTAG);
 152 }
 153
 154 static inline struct symbol *
 155 SYMBOL(lispobj obj)
 156 {
 157   return (struct symbol *)(obj - OTHER_POINTER_LOWTAG);
 158 }
 159
 160 static inline struct fdefn *
 161 FDEFN(lispobj obj)
 162 {
 163   return (struct fdefn *)(obj - OTHER_POINTER_LOWTAG);
 164 }
 165
 166 /* Is the Lisp object obj something with pointer nature (as opposed to
 167  * e.g. a fixnum or character or unbound marker)? */
 168 static inline int
 169 is_lisp_pointer(lispobj obj)
 170 {
 171     return obj & 1;
 172 }
 173
 174 #include "fixnump.h"
 175
 176 /* Is the Lisp object obj something with immediate nature (e.g. a
 177  * fixnum or character or unbound marker)? */
 178 static inline int
 179 is_lisp_immediate(lispobj obj)
 180 {
 181     return (fixnump(obj)
 182             || (widetag_of(obj) == CHARACTER_WIDETAG)
 183 #if N_WORD_BITS == 64
 184             || (widetag_of(obj) == SINGLE_FLOAT_WIDETAG)
 185 #endif
 186             || (widetag_of(obj) == UNBOUND_MARKER_WIDETAG));
 187 }
 188
 189 /* Convert from a lispobj with type bits to a native (ordinary
 190  * C/assembly) pointer to the beginning of the object. */
 191 static inline lispobj *
 192 native_pointer(lispobj obj)
 193 {
 194     return (lispobj *) ((pointer_sized_uint_t) (obj & ~LOWTAG_MASK));
 195 }
 196
 197 /* inverse operation: create a suitably tagged lispobj from a native
 198  * pointer or integer.*/
 199 static inline lispobj
 200 make_lispobj(void *o, int low_tag)
 201 {
 202     return LOW_WORD(o) | low_tag;
 203 }
 204
 205 static inline lispobj
 206 make_fixnum(long n)
 207 {
 208     return n << N_FIXNUM_TAG_BITS;
 209 }
 210
 211 static inline long
 212 fixnum_value(lispobj n)
 213 {
 214     return n >> N_FIXNUM_TAG_BITS;
 215 }
 216
 217 #if defined(LISP_FEATURE_WIN32)
 218 /* KLUDGE: Avoid double definition of boolean by rpcndr.h included via
 219  * shlobj.h.
 220  *
 221  * FIXME: We should probably arrange to use the rpcndr.h boolean on Windows,
 222  * or get rid of our own boolean type.  If the boolean type is only used in
 223  * the runtime, and never passed to Lisp, then it doesn't matter which one
 224  * we use.
 225  */
 226 #define boolean rpcndr_boolean
 227 #include <shlobj.h>
 228 #undef boolean
 229 #endif
 230 typedef int boolean;
 231
 232 static inline boolean
 233 other_immediate_lowtag_p(lispobj header)
 234 {
 235     switch (lowtag_of(header)) {
 236     case OTHER_IMMEDIATE_0_LOWTAG:
 237     case OTHER_IMMEDIATE_1_LOWTAG:
 238 #ifdef OTHER_IMMEDIATE_2_LOWTAG
 239     case OTHER_IMMEDIATE_2_LOWTAG:
 240 #endif
 241 #ifdef OTHER_IMMEDIATE_3_LOWTAG
 242     case OTHER_IMMEDIATE_3_LOWTAG:
 243 #endif
 244         return 1;
 245     default:
 246         return 0;
 247     }
 248 }
 249
 250 /* KLUDGE: As far as I can tell there's no ANSI C way of saying
 251  * "this function never returns". This is the way that you do it
 252  * in GCC later than version 2.5 or so. */
 253 #if defined(__GNUC__)
 254 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 5)
 255 #define never_returns __attribute__ ((noreturn))
 256 #else
 257 #define never_returns
 258 #endif
 259 #else
 260 #define never_returns
 261 #endif
 262
 263 extern void *successful_malloc (size_t size);
 264 extern char *copied_string (char *string);
 265
 266 #define RUNTIME_OPTIONS_MAGIC 0x31EBF355
 267 /* 1 for magic, 1 for boolean, 2 for struct runtime_options fields */
 268 #define RUNTIME_OPTIONS_WORDS (1 + 1 + 2)
 269
 270 struct runtime_options {
 271     size_t dynamic_space_size;
 272     size_t thread_control_stack_size;
 273 };
 274
 275 /* saved runtime path computed from argv[0] */
 276 extern char *saved_runtime_path;
 277
 278 #endif /* _SBCL_RUNTIME_H_ */