libgo/runtime/print.c

   1 // Copyright 2009 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 #include <stdarg.h>
   6 #include "runtime.h"
   7
   8 //static Lock debuglock;
   9
  10 static void go_vprintf(const char*, va_list);
  11
  12 // write to goroutine-local buffer if diverting output,
  13 // or else standard error.
  14 static void
  15 gwrite(const void *v, int32 n)
  16 {
  17         G* g = runtime_g();
  18
  19         if(g == nil || g->writebuf == nil) {
  20                 runtime_write(2, v, n);
  21                 return;
  22         }
  23
  24         if(g->writenbuf == 0)
  25                 return;
  26
  27         if(n > g->writenbuf)
  28                 n = g->writenbuf;
  29         runtime_memmove(g->writebuf, v, n);
  30         g->writebuf += n;
  31         g->writenbuf -= n;
  32 }
  33
  34 void
  35 runtime_dump(byte *p, int32 n)
  36 {
  37         int32 i;
  38
  39         for(i=0; i<n; i++) {
  40                 runtime_printpointer((byte*)(uintptr)(p[i]>>4));
  41                 runtime_printpointer((byte*)(uintptr)(p[i]&0xf));
  42                 if((i&15) == 15)
  43                         runtime_prints("\n");
  44                 else
  45                         runtime_prints(" ");
  46         }
  47         if(n & 15)
  48                 runtime_prints("\n");
  49 }
  50
  51 void
  52 runtime_prints(const char *s)
  53 {
  54         gwrite(s, runtime_findnull((const byte*)s));
  55 }
  56
  57 void
  58 runtime_printf(const char *s, ...)
  59 {
  60         va_list va;
  61
  62         va_start(va, s);
  63         go_vprintf(s, va);
  64         va_end(va);
  65 }
  66
  67 // Very simple printf.  Only for debugging prints.
  68 // Do not add to this without checking with Rob.
  69 static void
  70 go_vprintf(const char *s, va_list va)
  71 {
  72         const char *p, *lp;
  73
  74         //runtime_lock(&debuglock);
  75
  76         lp = p = s;
  77         for(; *p; p++) {
  78                 if(*p != '%')
  79                         continue;
  80                 if(p > lp)
  81                         gwrite(lp, p-lp);
  82                 p++;
  83                 switch(*p) {
  84                 case 'a':
  85                         runtime_printslice(va_arg(va, Slice));
  86                         break;
  87                 case 'd':
  88                         runtime_printint(va_arg(va, int32));
  89                         break;
  90                 case 'D':
  91                         runtime_printint(va_arg(va, int64));
  92                         break;
  93                 case 'e':
  94                         runtime_printeface(va_arg(va, Eface));
  95                         break;
  96                 case 'f':
  97                         runtime_printfloat(va_arg(va, float64));
  98                         break;
  99                 case 'C':
 100                         runtime_printcomplex(va_arg(va, __complex double));
 101                         break;
 102                 case 'i':
 103                         runtime_printiface(va_arg(va, Iface));
 104                         break;
 105                 case 'p':
 106                         runtime_printpointer(va_arg(va, void*));
 107                         break;
 108                 case 's':
 109                         runtime_prints(va_arg(va, char*));
 110                         break;
 111                 case 'S':
 112                         runtime_printstring(va_arg(va, String));
 113                         break;
 114                 case 't':
 115                         runtime_printbool(va_arg(va, int));
 116                         break;
 117                 case 'U':
 118                         runtime_printuint(va_arg(va, uint64));
 119                         break;
 120                 case 'x':
 121                         runtime_printhex(va_arg(va, uint32));
 122                         break;
 123                 case 'X':
 124                         runtime_printhex(va_arg(va, uint64));
 125                         break;
 126                 }
 127                 lp = p+1;
 128         }
 129         if(p > lp)
 130                 gwrite(lp, p-lp);
 131
 132         //runtime_unlock(&debuglock);
 133 }
 134
 135 void
 136 runtime_printpc(void *p __attribute__ ((unused)))
 137 {
 138         runtime_prints("PC=");
 139         runtime_printhex((uint64)(uintptr)runtime_getcallerpc(p));
 140 }
 141
 142 void
 143 runtime_printbool(_Bool v)
 144 {
 145         if(v) {
 146                 gwrite("true", 4);
 147                 return;
 148         }
 149         gwrite("false", 5);
 150 }
 151
 152 void
 153 runtime_printfloat(double v)
 154 {
 155         byte buf[20];
 156         int32 e, s, i, n;
 157         float64 h;
 158
 159         if(runtime_isNaN(v)) {
 160                 gwrite("NaN", 3);
 161                 return;
 162         }
 163         if(runtime_isInf(v, 1)) {
 164                 gwrite("+Inf", 4);
 165                 return;
 166         }
 167         if(runtime_isInf(v, -1)) {
 168                 gwrite("-Inf", 4);
 169                 return;
 170         }
 171
 172         n = 7;  // digits printed
 173         e = 0;  // exp
 174         s = 0;  // sign
 175         if(v != 0) {
 176                 // sign
 177                 if(v < 0) {
 178                         v = -v;
 179                         s = 1;
 180                 }
 181
 182                 // normalize
 183                 while(v >= 10) {
 184                         e++;
 185                         v /= 10;
 186                 }
 187                 while(v < 1) {
 188                         e--;
 189                         v *= 10;
 190                 }
 191
 192                 // round
 193                 h = 5;
 194                 for(i=0; i<n; i++)
 195                         h /= 10;
 196
 197                 v += h;
 198                 if(v >= 10) {
 199                         e++;
 200                         v /= 10;
 201                 }
 202         }
 203
 204         // format +d.dddd+edd
 205         buf[0] = '+';
 206         if(s)
 207                 buf[0] = '-';
 208         for(i=0; i<n; i++) {
 209                 s = v;
 210                 buf[i+2] = s+'0';
 211                 v -= s;
 212                 v *= 10.;
 213         }
 214         buf[1] = buf[2];
 215         buf[2] = '.';
 216
 217         buf[n+2] = 'e';
 218         buf[n+3] = '+';
 219         if(e < 0) {
 220                 e = -e;
 221                 buf[n+3] = '-';
 222         }
 223
 224         buf[n+4] = (e/100) + '0';
 225         buf[n+5] = (e/10)%10 + '0';
 226         buf[n+6] = (e%10) + '0';
 227         gwrite(buf, n+7);
 228 }
 229
 230 void
 231 runtime_printcomplex(__complex double v)
 232 {
 233         gwrite("(", 1);
 234         runtime_printfloat(__builtin_creal(v));
 235         runtime_printfloat(__builtin_cimag(v));
 236         gwrite("i)", 2);
 237 }
 238
 239 void
 240 runtime_printuint(uint64 v)
 241 {
 242         byte buf[100];
 243         int32 i;
 244
 245         for(i=nelem(buf)-1; i>0; i--) {
 246                 buf[i] = v%10 + '0';
 247                 if(v < 10)
 248                         break;
 249                 v = v/10;
 250         }
 251         gwrite(buf+i, nelem(buf)-i);
 252 }
 253
 254 void
 255 runtime_printint(int64 v)
 256 {
 257         if(v < 0) {
 258                 gwrite("-", 1);
 259                 v = -v;
 260         }
 261         runtime_printuint(v);
 262 }
 263
 264 void
 265 runtime_printhex(uint64 v)
 266 {
 267         static const char *dig = "0123456789abcdef";
 268         byte buf[100];
 269         int32 i;
 270
 271         i=nelem(buf);
 272         for(; v>0; v/=16)
 273                 buf[--i] = dig[v%16];
 274         if(i == nelem(buf))
 275                 buf[--i] = '0';
 276         buf[--i] = 'x';
 277         buf[--i] = '0';
 278         gwrite(buf+i, nelem(buf)-i);
 279 }
 280
 281 void
 282 runtime_printpointer(void *p)
 283 {
 284         runtime_printhex((uint64)(uintptr)p);
 285 }
 286
 287 void
 288 runtime_printstring(String v)
 289 {
 290         // extern uint32 runtime_maxstring;
 291
 292         // if(v.len > runtime_maxstring) {
 293         //      gwrite("[invalid string]", 16);
 294         //      return;
 295         // }
 296         if(v.__length > 0)
 297                 gwrite(v.__data, v.__length);
 298 }
 299
 300 void
 301 __go_print_space(void)
 302 {
 303         gwrite(" ", 1);
 304 }
 305
 306 void
 307 __go_print_nl(void)
 308 {
 309         gwrite("\n", 1);
 310 }