libgo/runtime/runtime.h

   1 /* runtime.h -- runtime support for Go.
   2
   3    Copyright 2009 The Go Authors. All rights reserved.
   4    Use of this source code is governed by a BSD-style
   5    license that can be found in the LICENSE file.  */
   6
   7 #include "config.h"
   8
   9 #define _GNU_SOURCE
  10 #include "go-assert.h"
  11 #include <signal.h>
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <string.h>
  15 #include <sys/types.h>
  16 #include <sys/stat.h>
  17 #include <fcntl.h>
  18 #include <pthread.h>
  19 #include <semaphore.h>
  20
  21 #ifdef HAVE_SYS_MMAN_H
  22 #include <sys/mman.h>
  23 #endif
  24
  25 #include "go-alloc.h"
  26 #include "go-panic.h"
  27 #include "go-string.h"
  28
  29 typedef struct __go_string String;
  30
  31 /* This file supports C files copied from the 6g runtime library.
  32    This is a version of the 6g runtime.h rewritten for gccgo's version
  33    of the code.  */
  34
  35 typedef signed int   int8    __attribute__ ((mode (QI)));
  36 typedef unsigned int uint8   __attribute__ ((mode (QI)));
  37 typedef signed int   int16   __attribute__ ((mode (HI)));
  38 typedef unsigned int uint16  __attribute__ ((mode (HI)));
  39 typedef signed int   int32   __attribute__ ((mode (SI)));
  40 typedef unsigned int uint32  __attribute__ ((mode (SI)));
  41 typedef signed int   int64   __attribute__ ((mode (DI)));
  42 typedef unsigned int uint64  __attribute__ ((mode (DI)));
  43 typedef float        float32 __attribute__ ((mode (SF)));
  44 typedef double       float64 __attribute__ ((mode (DF)));
  45 typedef unsigned int uintptr __attribute__ ((mode (pointer)));
  46
  47 /* Defined types.  */
  48
  49 typedef uint8                   bool;
  50 typedef uint8                   byte;
  51 typedef struct  M               M;
  52 typedef struct  MCache          MCache;
  53 typedef struct  Lock            Lock;
  54
  55 /* We use mutexes for locks.  6g uses futexes directly, and perhaps
  56    someday we will do that too.  */
  57
  58 struct  Lock
  59 {
  60         uint32 key;
  61         sem_t sem;
  62 };
  63
  64 /* A Note.  */
  65
  66 typedef struct  Note            Note;
  67
  68 struct Note {
  69         int32 woken;
  70 };
  71
  72 /* Per CPU declarations.  */
  73
  74 #ifdef __rtems__
  75 #define __thread
  76 #endif
  77
  78 extern __thread         M*      m;
  79
  80 extern M        m0;
  81
  82 #ifdef __rtems__
  83 #undef __thread
  84 #endif
  85
  86 /* Constants.  */
  87
  88 enum
  89 {
  90         true    = 1,
  91         false   = 0,
  92 };
  93
  94 /* Structures.  */
  95
  96 struct  M
  97 {
  98         int32   mallocing;
  99         int32   gcing;
 100         int32   locks;
 101         int32   nomemprof;
 102         int32   gcing_for_prof;
 103         int32   holds_finlock;
 104         int32   gcing_for_finlock;
 105         MCache  *mcache;
 106
 107         /* For the list of all threads.  */
 108         struct __go_thread_id *list_entry;
 109
 110         /* For the garbage collector.  */
 111         void    *gc_sp;
 112         size_t  gc_len;
 113         void    *gc_next_segment;
 114         void    *gc_next_sp;
 115         void    *gc_initial_sp;
 116         struct __go_panic_defer_struct *gc_panic_defer;
 117 };
 118
 119 /* Macros.  */
 120 #define nelem(x)        (sizeof(x)/sizeof((x)[0]))
 121 #define nil             ((void*)0)
 122 #define USED(v)         ((void) v)
 123
 124 /* We map throw to assert.  */
 125 #define runtime_throw(s) __go_assert(s == 0)
 126
 127 void*   runtime_mal(uintptr);
 128 void    runtime_mallocinit(void);
 129 void    runtime_initfintab(void);
 130 void    siginit(void);
 131 bool    __go_sigsend(int32 sig);
 132 int64   runtime_nanotime(void);
 133
 134 void    runtime_stoptheworld(void);
 135 void    runtime_starttheworld(void);
 136 void    __go_go(void (*pfn)(void*), void*);
 137 void    __go_gc_goroutine_init(void*);
 138 void    __go_enable_gc(void);
 139 int     __go_run_goroutine_gc(int);
 140 void    __go_scanstacks(void (*scan)(byte *, int64));
 141 void    __go_stealcache(void);
 142 void    __go_cachestats(void);
 143
 144 /*
 145  * mutual exclusion locks.  in the uncontended case,
 146  * as fast as spin locks (just a few user-level instructions),
 147  * but on the contention path they sleep in the kernel.
 148  */
 149 void    runtime_initlock(Lock*);
 150 void    runtime_lock(Lock*);
 151 void    runtime_unlock(Lock*);
 152 void    runtime_destroylock(Lock*);
 153
 154 void semacquire (uint32 *) asm ("libgo_runtime.runtime.Semacquire");
 155 void semrelease (uint32 *) asm ("libgo_runtime.runtime.Semrelease");
 156
 157 /*
 158  * sleep and wakeup on one-time events.
 159  * before any calls to notesleep or notewakeup,
 160  * must call noteclear to initialize the Note.
 161  * then, any number of threads can call notesleep
 162  * and exactly one thread can call notewakeup (once).
 163  * once notewakeup has been called, all the notesleeps
 164  * will return.  future notesleeps will return immediately.
 165  */
 166 void    noteclear(Note*);
 167 void    notesleep(Note*);
 168 void    notewakeup(Note*);
 169
 170 /* Functions.  */
 171 #define runtime_printf printf
 172 #define runtime_malloc(s) __go_alloc(s)
 173 #define runtime_free(p) __go_free(p)
 174 #define runtime_memclr(buf, size) __builtin_memset((buf), 0, (size))
 175 #define runtime_strcmp(s1, s2) __builtin_strcmp((s1), (s2))
 176 #define runtime_getenv(s) getenv(s)
 177 #define runtime_atoi(s) atoi(s)
 178 #define runtime_mcmp(a, b, s) __builtin_memcmp((a), (b), (s))
 179 #define runtime_memmove(a, b, s) __builtin_memmove((a), (b), (s))
 180 MCache* runtime_allocmcache(void);
 181 void    free(void *v);
 182 struct __go_func_type;
 183 void    runtime_addfinalizer(void*, void(*fn)(void*), const struct __go_func_type *);
 184 void    runtime_walkfintab(void (*fn)(void*), void (*scan)(byte *, int64));
 185 #define runtime_mmap mmap
 186 #define runtime_munmap(p, s) munmap((p), (s))
 187 #define runtime_cas(pval, old, new) __sync_bool_compare_and_swap (pval, old, new)
 188
 189 struct __go_func_type;
 190 void reflect_call(const struct __go_func_type *, const void *, _Bool, void **,
 191                   void **)
 192   asm ("libgo_reflect.reflect.call");
 193
 194 #ifdef __rtems__
 195 void __wrap_rtems_task_variable_add(void **);
 196 #endif