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 /*#define QSHOW */ /* Enable low-level debugging output? */
  19
  20 #ifdef QSHOW
  21 #define FSHOW(args) fprintf args
  22 #define SHOW(string) FSHOW((stderr, "/%s\n", string))
  23 #else
  24 #define FSHOW(args)
  25 #define SHOW(string)
  26 #endif
  27
  28 /* Enable extra-verbose low-level debugging output for signals? (You
  29  * probably don't want this unless you're trying to debug very early
  30  * cold boot on a new machine, or one where you've just messed up
  31  * signal handling.)
  32  *
  33  * Note: It may be that doing this is fundamentally unsound, since it
  34  * causes output from signal handlers, and the i/o libraries aren't
  35  * necessarily reentrant. But it can still be very convenient for
  36  * figuring out what's going on when you have a signal handling
  37  * problem.. */
  38 #define QSHOW_SIGNALS 0
  39
  40 #if QSHOW_SIGNALS
  41 #define FSHOW_SIGNAL FSHOW
  42 #else
  43 #define FSHOW_SIGNAL(args)
  44 #endif
  45
  46 /* KLUDGE: These are in theory machine-dependent and OS-dependent, but
  47  * in practice the "foo int" definitions work for all the machines
  48  * that SBCL runs on as of 0.6.7. If we port to the Alpha or some
  49  * other non-32-bit machine we'll probably need real machine-dependent
  50  * and OS-dependent definitions again. */
  51 /* even on alpha, int happens to be 4 bytes.  long is longer. */
  52 /* FIXME: these names really shouldn't reflect their length and this
  53    is not quite right for some of the FFI stuff */
  54 typedef unsigned long u64;
  55 typedef signed long s64;
  56 typedef unsigned int u32;
  57 typedef signed int s32;
  58
  59 /* this is an integral type the same length as a machine pointer */
  60 typedef unsigned long pointer_sized_uint_t ;
  61
  62 #include <sys/types.h>
  63
  64 #if defined(LISP_FEATURE_SB_THREAD)
  65 #include <pthread.h>
  66 typedef pthread_t os_thread_t;
  67 #else
  68 typedef pid_t os_thread_t;
  69 #endif
  70
  71 /* FIXME: we do things this way because of the alpha32 port.  once
  72    alpha64 has arrived, all this nastiness can go away */
  73 #if 64 == N_WORD_BITS
  74 #define LOW_WORD(c) ((pointer_sized_uint_t)c)
  75 typedef unsigned long lispobj;
  76 #else
  77 #define LOW_WORD(c) ((long)(c) & 0xFFFFFFFFL)
  78 /* fake it on alpha32 */
  79 typedef unsigned int lispobj;
  80 #endif
  81
  82 static inline int
  83 lowtag_of(lispobj obj)
  84 {
  85     return obj & LOWTAG_MASK;
  86 }
  87
  88 static inline int
  89 widetag_of(lispobj obj)
  90 {
  91     return obj & WIDETAG_MASK;
  92 }
  93
  94 static inline unsigned long
  95 HeaderValue(lispobj obj)
  96 {
  97   return obj >> N_WIDETAG_BITS;
  98 }
  99
 100 static inline struct cons *
 101 CONS(lispobj obj)
 102 {
 103   return (struct cons *)(obj - LIST_POINTER_LOWTAG);
 104 }
 105
 106 static inline struct symbol *
 107 SYMBOL(lispobj obj)
 108 {
 109   return (struct symbol *)(obj - OTHER_POINTER_LOWTAG);
 110 }
 111
 112 static inline struct fdefn *
 113 FDEFN(lispobj obj)
 114 {
 115   return (struct fdefn *)(obj - OTHER_POINTER_LOWTAG);
 116 }
 117
 118 /* Is the Lisp object obj something with pointer nature (as opposed to
 119  * e.g. a fixnum or character or unbound marker)? */
 120 static inline int
 121 is_lisp_pointer(lispobj obj)
 122 {
 123     return obj & 1;
 124 }
 125
 126 /* Convert from a lispobj with type bits to a native (ordinary
 127  * C/assembly) pointer to the beginning of the object. */
 128 static inline lispobj *
 129 native_pointer(lispobj obj)
 130 {
 131     return (lispobj *) ((pointer_sized_uint_t) (obj & ~LOWTAG_MASK));
 132 }
 133
 134 /* inverse operation: create a suitably tagged lispobj from a native
 135  * pointer or integer.  Needs to be a macro due to the tedious C type
 136  * system */
 137 #define make_lispobj(o,low_tag) ((lispobj)(LOW_WORD(o)|low_tag))
 138
 139 /* FIXME: There seems to be no reason that make_fixnum and fixnum_value
 140  * can't be implemented as (possibly inline) functions. */
 141 #define make_fixnum(n) ((lispobj)((n)<<N_FIXNUM_TAG_BITS))
 142 #define fixnum_value(n) (((long)n)>>N_FIXNUM_TAG_BITS)
 143
 144 /* Too bad ANSI C doesn't define "bool" as C++ does.. */
 145 typedef int boolean;
 146
 147 /* This only works for static symbols. */
 148 /* FIXME: should be called StaticSymbolFunction, right? */
 149 #define SymbolFunction(sym) \
 150     (((struct fdefn *)(native_pointer(SymbolValue(sym,0))))->fun)
 151
 152 /* KLUDGE: As far as I can tell there's no ANSI C way of saying
 153  * "this function never returns". This is the way that you do it
 154  * in GCC later than version 2.5 or so. */
 155 #if defined(__GNUC__)
 156 #if __GNUC__ > 2 || (__GNUC__ == 2 && __GNUC_MINOR__ >= 5)
 157 #define never_returns __attribute__ ((noreturn))
 158 #else
 159 #define never_returns
 160 #endif
 161 #else
 162 #define never_returns
 163 #endif
 164
 165 extern void *successful_malloc (size_t size);
 166 extern char *copied_string (char *string);
 167
 168 #endif /* _SBCL_RUNTIME_H_ */