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_WIN32) && defined(LISP_FEATURE_SB_THREAD)
  19 # include "pthreads_win32.h"
  20 #else
  21 # include <signal.h>
  22 # ifdef LISP_FEATURE_SB_THREAD
  23 #  include <pthread.h>
  24 # endif
  25 #endif
  26
  27 #include <stdint.h>
  28
  29 #if defined(LISP_FEATURE_SB_THREAD)
  30 #define thread_self() pthread_self()
  31 #define thread_kill pthread_kill
  32
  33 #ifdef LISP_FEATURE_WIN32
  34 #define thread_sigmask _sbcl_pthread_sigmask
  35 #else
  36 #define thread_sigmask pthread_sigmask
  37 #endif
  38
  39 #define thread_mutex_lock(l) pthread_mutex_lock(l)
  40 #define thread_mutex_unlock(l) pthread_mutex_unlock(l)
  41 #else
  42 #define thread_self() 0
  43 #define thread_kill kill_safely
  44 #define thread_sigmask sigprocmask
  45 #define thread_mutex_lock(l) 0
  46 #define thread_mutex_unlock(l) 0
  47 #endif
  48
  49 #if defined(LISP_FEATURE_WIN32) && defined(LISP_FEATURE_SB_THREAD)
  50 void os_preinit();
  51 #endif
  52
  53 void os_link_runtime();
  54
  55 #if defined(LISP_FEATURE_SB_SAFEPOINT)
  56
  57 typedef enum {
  58     GC_NONE=0,
  59     GC_FLIGHT,
  60     GC_MESSAGE,
  61     GC_INVOKED,
  62     GC_QUIET,
  63     GC_SETTLED,
  64     GC_COLLECT,
  65     GC_NPHASES
  66 }  gc_phase_t;
  67
  68 void map_gc_page();
  69 void unmap_gc_page();
  70 int check_pending_interrupts();
  71 void gc_state_lock();
  72 void gc_state_wait(gc_phase_t);
  73 void gc_state_unlock();
  74
  75 #endif
  76
  77 /*
  78  * The next few defines serve as configuration -- edit them inline if
  79  * you are a developer and want to affect FSHOW behaviour.
  80  */
  81
  82 /* Block blockable interrupts for each SHOW, if not 0.
  83  * (On Windows, this setting has no effect.)
  84  *
  85  * In principle, this is a "configuration option", but I am not aware of
  86  * any reason why or when it would be advantageous to disable it. */
  87 #define QSHOW_SIGNAL_SAFE 1
  88
  89 /* Enable extra-verbose low-level debugging output for signals? (You
  90  * probably don't want this unless you're trying to debug very early
  91  * cold boot on a new machine, or one where you've just messed up
  92  * signal handling.)
  93  *
  94  * Note: It may be that doing this is fundamentally unsound, since it
  95  * causes output from signal handlers, and the i/o libraries aren't
  96  * necessarily reentrant. But it can still be very convenient for
  97  * figuring out what's going on when you have a signal handling
  98  * problem.
  99  *
 100  * Possible values are:
 101  *   0 -- Never show signal-related output.  There is absolutely no
 102  *        run-time overhead from FSHOW_SIGNAL in this case.
 103  *
 104  *   1 -- (recommended)
 105  *        Show signal-related output only if selected at run-time
 106  *        (otherwise almost no run-time overhead).
 107  *
 108  *   2 -- Unconditionally show signal-related output.
 109  *        Very significant overhead.
 110  *
 111  * For reasons of tradition, we default to 0 on POSIX and 1 on Windows
 112  * through :SB-QSHOW.
 113  *
 114  * With option 1, set up environment variable SBCL_DYNDEBUG to include
 115  * "fshow" or "fshow_signal" before starting SBCL to enable output.
 116  *
 117  * There is no particular advantage to option 2 except that you do not
 118  * need to set environment variables in this case.
 119  */
 120 #ifdef LISP_FEATURE_SB_QSHOW
 121 # define QSHOW_SIGNALS 1
 122 #else
 123 # define QSHOW_SIGNALS 0
 124 #endif
 125
 126 /* Enable low-level debugging output, if not zero. Defaults to enabled
 127  * if QSHOW_SIGNALS, disabled otherwise. Change it to 1 or 2 if you want
 128  * low-level debugging output but not the whole signal mess. */
 129 #define QSHOW QSHOW_SIGNALS
 130
 131 /*
 132  * Configuration options end here -- the following defines do not
 133  * generally need customization.
 134  */
 135
 136 #define odxprint(topic, fmt, ...)                       \
 137     do                                                  \
 138         if (dyndebug_config.dyndebug_##topic)           \
 139             odxprint_fun(fmt "\n", ##__VA_ARGS__);      \
 140     while (0)
 141
 142 void odxprint_fun(const char *fmt, ...);
 143 void fshow_fun(void *ignored, const char *fmt, ...);
 144
 145 /* Flags defined in a structure to avoid code duplication between
 146  * declaration and definition. */
 147 extern struct dyndebug_config {
 148     int dyndebug_fshow;
 149     int dyndebug_fshow_signal;
 150     int dyndebug_gencgc_verbose;
 151     int dyndebug_safepoints;
 152     int dyndebug_seh;
 153     int dyndebug_misc;
 154     int dyndebug_pagefaults;
 155     int dyndebug_backtrace_when_lost;
 156     int dyndebug_sleep_when_lost;
 157     int dyndebug_io;
 158     int dyndebug_runtime_link;
 159 } dyndebug_config;
 160
 161 #ifdef LISP_FEATURE_GENCGC
 162 extern int gencgc_verbose;
 163 #endif
 164
 165 void dyndebug_init(void);
 166
 167 #if QSHOW_SIGNAL_SAFE == 1 && !defined(LISP_FEATURE_WIN32)
 168
 169 extern sigset_t blockable_sigset;
 170
 171 #define QSHOW_BLOCK                                             \
 172         sigset_t oldset;                                        \
 173         thread_sigmask(SIG_BLOCK, &blockable_sigset, &oldset)
 174 #define QSHOW_UNBLOCK thread_sigmask(SIG_SETMASK,&oldset,0)
 175 #else
 176 #define QSHOW_BLOCK
 177 #define QSHOW_UNBLOCK
 178 #endif
 179
 180 /* The following macros duplicate the expansion of odxprint, because the
 181  * extra level of parentheses around `args' prevents us from
 182  * implementing FSHOW in terms of odxprint directly.  (They also differ
 183  * in a newline.)
 184  */
 185
 186 #if QSHOW
 187 # define FSHOW(args) \
 188     do if (dyndebug_config.dyndebug_fshow) fshow_fun args; while (0)
 189 # define SHOW(string) FSHOW((stderr, "/%s\n", string))
 190 #else
 191 # define FSHOW(args)
 192 # define SHOW(string)
 193 #endif
 194
 195 #if QSHOW_SIGNALS
 196 # define FSHOW_SIGNAL(args)                                             \
 197     do if (dyndebug_config.dyndebug_fshow_signal) fshow_fun args; while (0)
 198 #else
 199 # define FSHOW_SIGNAL(args)
 200 #endif
 201
 202 /* KLUDGE: These are in theory machine-dependent and OS-dependent, but
 203  * in practice the "foo int" definitions work for all the machines
 204  * that SBCL runs on as of 0.6.7. If we port to the Alpha or some
 205  * other non-32-bit machine we'll probably need real machine-dependent
 206  * and OS-dependent definitions again. */
 207 /* even on alpha, int happens to be 4 bytes.  long is longer. */
 208 /* FIXME: these names really shouldn't reflect their length and this
 209    is not quite right for some of the FFI stuff */
 210 #if defined(LISP_FEATURE_WIN32)&&defined(LISP_FEATURE_X86_64)
 211 typedef unsigned long long u64;
 212 typedef signed long long s64;
 213 #else
 214 typedef unsigned long u64;
 215 typedef signed long s64;
 216 #endif
 217 typedef unsigned int u32;
 218 typedef signed int s32;
 219
 220 #ifdef _WIN64
 221 #define AMD64_SYSV_ABI __attribute__((sysv_abi))
 222 #else
 223 #define AMD64_SYSV_ABI
 224 #endif
 225
 226 #include <sys/types.h>
 227
 228 #if defined(LISP_FEATURE_SB_THREAD)
 229 typedef pthread_t os_thread_t;
 230 #else
 231 typedef pid_t os_thread_t;
 232 #endif
 233
 234 #ifndef LISP_FEATURE_ALPHA
 235 typedef uintptr_t uword_t;
 236 typedef intptr_t  sword_t;
 237 #else
 238 /* The alpha32 port uses non-intptr-sized words */
 239 typedef u32 uword_t;
 240 typedef s32 sword_t;
 241 #endif
 242
 243 /* FIXME: we do things this way because of the alpha32 port.  once
 244    alpha64 has arrived, all this nastiness can go away */
 245 #if 64 == N_WORD_BITS
 246 #define LOW_WORD(c) ((uintptr_t)c)
 247 #define OBJ_FMTX "lx"
 248 typedef uintptr_t lispobj;
 249 #else
 250 #define OBJ_FMTX "x"
 251 #define LOW_WORD(c) ((long)(c) & 0xFFFFFFFFL)
 252 /* fake it on alpha32 */
 253 typedef unsigned int lispobj;
 254 #endif
 255
 256 static inline int
 257 lowtag_of(lispobj obj)
 258 {
 259     return obj & LOWTAG_MASK;
 260 }
 261
 262 static inline int
 263 widetag_of(lispobj obj)
 264 {
 265     return obj & WIDETAG_MASK;
 266 }
 267
 268 static inline uword_t
 269 HeaderValue(lispobj obj)
 270 {
 271   return obj >> N_WIDETAG_BITS;
 272 }
 273
 274 #ifdef LISP_FEATURE_IMMOBILE_SPACE
 275 #define HEADER_VALUE_MASKED(x) (HeaderValue(x) & SHORT_HEADER_MAX_WORDS)
 276 #else
 277 #define HEADER_VALUE_MASKED(x) HeaderValue(x)
 278 #endif
 279 static inline uword_t instance_length(lispobj header)
 280 {
 281   return HEADER_VALUE_MASKED(header);
 282 }
 283 static inline lispobj instance_layout(lispobj* instance_ptr) // native ptr
 284 {
 285 #ifdef LISP_FEATURE_COMPACT_INSTANCE_HEADER
 286   return instance_ptr[0] >> 32; // the high half of the header is the layout
 287 #else
 288   return instance_ptr[1]; // the word following the header is the layout
 289 #endif
 290 }
 291 static inline lispobj fin_layout(lispobj* instance_ptr) // native ptr
 292 {
 293 #ifdef LISP_FEATURE_COMPACT_INSTANCE_HEADER
 294   return instance_ptr[0] >> 32; // the high half of the header is the layout
 295 #else
 296   // first 4 words are: header, trampoline, fin-fun, layout
 297   return instance_ptr[3];
 298 #endif
 299 }
 300
 301 static inline struct cons *
 302 CONS(lispobj obj)
 303 {
 304   return (struct cons *)(obj - LIST_POINTER_LOWTAG);
 305 }
 306
 307 static inline struct vector *
 308 VECTOR(lispobj obj)
 309 {
 310   return (struct vector *)(obj - OTHER_POINTER_LOWTAG);
 311 }
 312
 313 static inline struct symbol *
 314 SYMBOL(lispobj obj)
 315 {
 316   return (struct symbol *)(obj - OTHER_POINTER_LOWTAG);
 317 }
 318
 319 static inline struct fdefn *
 320 FDEFN(lispobj obj)
 321 {
 322   return (struct fdefn *)(obj - OTHER_POINTER_LOWTAG);
 323 }
 324
 325 /* Is the Lisp object obj something with pointer nature (as opposed to
 326  * e.g. a fixnum or character or unbound marker)? */
 327 static inline int
 328 is_lisp_pointer(lispobj obj)
 329 {
 330 #if N_WORD_BITS == 64
 331     return (obj & 3) == 3;
 332 #else
 333     return obj & 1;
 334 #endif
 335 }
 336
 337 #include "fixnump.h"
 338
 339 /* Is the Lisp object obj something with immediate nature (e.g. a
 340  * fixnum or character or unbound marker)? */
 341 static inline int
 342 is_lisp_immediate(lispobj obj)
 343 {
 344     return (fixnump(obj)
 345             || (widetag_of(obj) == CHARACTER_WIDETAG)
 346 #if N_WORD_BITS == 64
 347             || (widetag_of(obj) == SINGLE_FLOAT_WIDETAG)
 348 #endif
 349             || (widetag_of(obj) == UNBOUND_MARKER_WIDETAG));
 350 }
 351
 352 /* Convert from a lispobj with type bits to a native (ordinary
 353  * C/assembly) pointer to the beginning of the object. */
 354 static inline lispobj *
 355 native_pointer(lispobj obj)
 356 {
 357     return (lispobj *) ((uintptr_t) (obj & ~LOWTAG_MASK));
 358 }
 359
 360 /* inverse operation: create a suitably tagged lispobj from a native
 361  * pointer or integer.*/
 362 static inline lispobj
 363 make_lispobj(void *o, int low_tag)
 364 {
 365     return LOW_WORD(o) | low_tag;
 366 }
 367
 368 #define MAKE_FIXNUM(n) (n << N_FIXNUM_TAG_BITS)
 369 static inline lispobj
 370 make_fixnum(sword_t n)
 371 {
 372     return MAKE_FIXNUM(n);
 373 }
 374
 375 static inline sword_t
 376 fixnum_value(lispobj n)
 377 {
 378     return n >> N_FIXNUM_TAG_BITS;
 379 }
 380
 381 static inline uword_t
 382 code_header_words(lispobj header) // given header = code->header
 383 {
 384   return HeaderValue(header) & SHORT_HEADER_MAX_WORDS;
 385 }
 386
 387 static inline sword_t
 388 code_instruction_words(lispobj n) // given n = code->code_size
 389 {
 390     /* Convert bytes into words, double-word aligned. */
 391     sword_t x = ((n >> N_FIXNUM_TAG_BITS) + LOWTAG_MASK) & ~LOWTAG_MASK;
 392
 393     return x >> WORD_SHIFT;
 394 }
 395 #undef HEADER_VALUE_MASKED
 396
 397 #if defined(LISP_FEATURE_WIN32)
 398 /* KLUDGE: Avoid double definition of boolean by rpcndr.h included via
 399  * shlobj.h.
 400  *
 401  * FIXME: We should probably arrange to use the rpcndr.h boolean on Windows,
 402  * or get rid of our own boolean type.  If the boolean type is only used in
 403  * the runtime, and never passed to Lisp, then it doesn't matter which one
 404  * we use.
 405  */
 406 #define boolean rpcndr_boolean
 407 #include <shlobj.h>
 408 #undef boolean
 409 #endif
 410 typedef int boolean;
 411
 412 static inline boolean
 413 other_immediate_lowtag_p(lispobj header)
 414 {
 415     /* These lowtags are spaced 4 apart throughout the lowtag space. */
 416     return (lowtag_of(header) & 3) == OTHER_IMMEDIATE_0_LOWTAG;
 417 }
 418
 419 static inline int
 420 is_cons_half(lispobj obj)
 421 {
 422     /* A word that satisfies other_immediate_lowtag_p is a headered object
 423      * and can not be half of a cons, except that widetags which satisfy
 424      * other_immediate and are Lisp immediates can be half of a cons */
 425     return !other_immediate_lowtag_p(obj)
 426 #if N_WORD_BITS == 64
 427         || ((uword_t)IMMEDIATE_WIDETAGS_MASK >> (widetag_of(obj) >> 2)) & 1;
 428 #else
 429       /* The above bit-shifting approach is not applicable
 430        * since we can't employ a 64-bit unsigned integer constant. */
 431       || widetag_of(obj) == CHARACTER_WIDETAG
 432       || widetag_of(obj) == UNBOUND_MARKER_WIDETAG;
 433 #endif
 434 }
 435
 436 /* KLUDGE: As far as I can tell there's no ANSI C way of saying
 437  * "this function never returns". This is the way that you do it
 438  * in GCC later than version 2.5 or so. */
 439 #if defined(__GNUC__)
 440 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 5)
 441 #define never_returns __attribute__ ((noreturn))
 442 #else
 443 #define never_returns
 444 #endif
 445 #else
 446 #define never_returns
 447 #endif
 448
 449 extern void *successful_malloc (size_t size);
 450 extern char *copied_string (char *string);
 451
 452 #if defined(LISP_FEATURE_SB_THREAD) && !defined(LISP_FEATURE_SB_SAFEPOINT)
 453 # define THREADS_USING_GCSIGNAL 1
 454 #endif
 455
 456 /* Now that SPARC has precise GENCGC, several places that used to be
 457  * #ifdef PCC need adjustment.  Clearly, "PPC or SPARC" is as unhelpful
 458  * a test as its reverse, "x86 or x86-64".  However, the feature
 459  * commonly used to differentiate between those two worlds is
 460  * C_STACK_IS_CONTROL_STACK, and clearly (or at least in my humble
 461  * opinion), at some point we'd like to have precise GC on x86 while
 462  * still sharing the C stack, so stack usage ought not imply GC
 463  * conservativeness.  So let's have a helper feature that makes the code
 464  * a bit more future-proof, even if it is itself currently defined in
 465  * the naive way: */
 466 #if defined(LISP_FEATURE_GENCGC) && !defined(LISP_FEATURE_C_STACK_IS_CONTROL_STACK)
 467 # define GENCGC_IS_PRECISE 1
 468 #endif
 469
 470 void *os_dlsym_default(char *name);
 471
 472 struct lisp_startup_options {
 473     boolean noinform;
 474 };
 475
 476 /* Even with just -O1, gcc optimizes the jumps in this "loop" away
 477  * entirely, giving the ability to define WITH-FOO-style macros. */
 478 #define RUN_BODY_ONCE(prefix, finally_do)               \
 479     int prefix##done = 0;                               \
 480     for (; !prefix##done; finally_do, prefix##done = 1)
 481
 482 // casting to void is no longer enough to suppress a warning about unused
 483 // results of libc functions declared with warn_unused_result.
 484 // from http://git.savannah.gnu.org/cgit/gnulib.git/tree/lib/ignore-value.h
 485 #if 3 < __GNUC__ + (4 <= __GNUC_MINOR__)
 486 # define ignore_value(x) \
 487       (__extension__ ({ __typeof__ (x) __x = (x); (void) __x; }))
 488 #else
 489 # define ignore_value(x) ((void) (x))
 490 #endif
 491
 492 #endif /* _SBCL_RUNTIME_H_ */