ghc/includes/COptJumps.lh

   1 \section[COptJumps]{Macros for tail-jumping}
   2
   3 % this file is part of the C-as-assembler document
   4
   5 \begin{code}
   6 #ifndef COPTJUMPS_H
   7 #define COPTJUMPS_H
   8 \end{code}
   9
  10 %************************************************************************
  11 %*                                                                      *
  12 \subsection[COptJumps-portable]{Tail-(non-)jumping in ``portable~C''}
  13 %*                                                                      *
  14 %************************************************************************
  15
  16 \begin{code}
  17 #if ! (defined(__STG_TAILJUMPS__) && defined(__GNUC__))
  18
  19 #define JMP_(target)    return((F_) (target))
  20 #define RESUME_(target) JMP_(target)
  21 \end{code}
  22
  23 Don't need to do anything magical for the mini-interpreter, because
  24 we're really going to use the plain old C one (and the debugging
  25 variant, too, for that matter).
  26
  27 %************************************************************************
  28 %*                                                                      *
  29 \subsection[COptJumps-optimised]{Tail-jumping in ``optimised~C''}
  30 %*                                                                      *
  31 %************************************************************************
  32
  33 \begin{code}
  34 #else /* __STG_TAILJUMPS__ && __GNUC__ */
  35 \end{code}
  36
  37 GCC will have assumed that pushing/popping of C-stack frames is going
  38 on when it generated its code, and used stack space accordingly.
  39 However, we actually {\em post-process away} all such stack-framery
  40 (see \tr{ghc/driver/ghc-asm-*.lprl}).
  41 Thing will be OK however, if we initially make sure there are
  42 @RESERVED_C_STACK_BYTES@ on the C-stack to begin with, for local
  43 variables.
  44
  45 \begin{code}
  46 #define RESERVED_C_STACK_BYTES (512 * sizeof(I_))  /* MUST BE OF GENEROUS ALIGNMENT */
  47 \end{code}
  48
  49 The platform-specific details are given in alphabetical order.
  50
  51 %************************************************************************
  52 %*                                                                      *
  53 \subsubsection[COptJumps-alpha]{Tail-jumping on Alphas}
  54 %*                                                                      *
  55 %************************************************************************
  56
  57 We have to set the procedure value register (\$27) before branching, so
  58 that the target function can load the gp (\$29) as appropriate.
  59
  60 It seems that \tr{_procedure} can't be declared within the body of the
  61 \tr{JMP_} macro...at least, not if we want it to be \$27, which we do!
  62
  63 \begin{code}
  64 #if alpha_dec_osf1_TARGET
  65     /* ToDo: less specific? */
  66
  67 /*
  68    Jumping to a new block of code, we need to set up $27 to point
  69    at the target, so that the callee can establish its gp (as an
  70    offset from its own starting address).  For some reason, gcc
  71    refuses to give us $27 for _procedure if it's declared as a
  72    local variable, so the workaround is to make it a global.
  73
  74    Note:  The local variable works in gcc 2.6.2, but fails in 2.5.8.
  75  */
  76
  77 /* MOVED: to COptRegs.lh -- very unsatisfactorily.
  78    Otherwise, we can get a "global register variable follows a
  79    function definition" error.
  80
  81    Once we can take gcc 2.6.x as std, then we can use
  82    the local variant, and the problem goes away.  (WDP 95/02)
  83
  84 register void *_procedure __asm__("$27");
  85 */
  86
  87 #define JMP_(cont)                              \
  88     do { _procedure = (void *)(cont);           \
  89          goto *_procedure;                      \
  90        } while(0)
  91
  92 /*
  93    When we resume at the point where a call was originally made,
  94    we need to restore $26, so that gp can be reloaded appropriately.
  95    However, sometimes we ``resume'' by entering a new function
  96    (typically EnterNodeCode), so we need to set up $27 as well.
  97  */
  98
  99 #define RESUME_(cont)                           \
 100     do { _procedure = (void *)(cont);           \
 101          __asm__ volatile("mov $27,$26");       \
 102          goto *_procedure;                      \
 103        } while(0);
 104
 105 #define MINI_INTERPRETER_SETUP                  \
 106     __asm__ volatile ("stq $9,-8($30)\n"        \
 107                       "stq $10,-16($30)\n"      \
 108                       "stq $11,-24($30)\n"      \
 109                       "stq $12,-32($30)\n"      \
 110                       "stq $13,-40($30)\n"      \
 111                       "stq $14,-48($30)\n"      \
 112                       "stq $15,-56($30)\n"      \
 113                       "stt $f2,-64($30)\n"      \
 114                       "stt $f3,-72($30)\n"      \
 115                       "stt $f4,-80($30)\n"      \
 116                       "stt $f5,-88($30)\n"      \
 117                       "stt $f6,-96($30)\n"      \
 118                       "stt $f7,-104($30)\n"     \
 119                       "stt $f8,-112($30)\n"     \
 120                       "stt $f9,-120($30)\n"     \
 121                       "lda $30,-%0($30)" : :    \
 122                       "K" (RESERVED_C_STACK_BYTES+8*sizeof(double)+8*sizeof(long)));
 123
 124 #define MINI_INTERPRETER_END                    \
 125     __asm__ volatile (".align 3\n"              \
 126                       ".globl miniInterpretEnd\n" \
 127                       "miniInterpretEnd:\n"     \
 128                       "lda $30,%0($30)\n"       \
 129                       "ldq $9,-8($30)\n"        \
 130                       "ldq $10,-16($30)\n"      \
 131                       "ldq $11,-24($30)\n"      \
 132                       "ldq $12,-32($30)\n"      \
 133                       "ldq $13,-40($30)\n"      \
 134                       "ldq $14,-48($30)\n"      \
 135                       "ldq $15,-56($30)\n"      \
 136                       "ldt $f2,-64($30)\n"      \
 137                       "ldt $f3,-72($30)\n"      \
 138                       "ldt $f4,-80($30)\n"      \
 139                       "ldt $f5,-88($30)\n"      \
 140                       "ldt $f6,-96($30)\n"      \
 141                       "ldt $f7,-104($30)\n"     \
 142                       "ldt $f8,-112($30)\n"     \
 143                       "ldt $f9,-120($30)" : :   \
 144                       "K" (RESERVED_C_STACK_BYTES+8*sizeof(double)+8*sizeof(long)));
 145
 146 #endif /* __alpha */
 147 \end{code}
 148
 149 %************************************************************************
 150 %*                                                                      *
 151 \subsubsection[COptJumps-Hpux]{Tail-jumping on a HP-PA machine running HP-UX}
 152 %*                                                                      *
 153 %************************************************************************
 154
 155 \begin{code}
 156 #if hppa1_1_hp_hpux_TARGET
 157
 158 /* do FUNBEGIN/END the easy way */
 159 #define FUNBEGIN    __asm__ volatile ("--- BEGIN ---");
 160 #define FUNEND      __asm__ volatile ("--- END ---");
 161
 162 /* The stack grows up!  Local variables are allocated just above the
 163    frame pointer, and extra arguments are stashed just below the stack
 164    pointer, so the safe space is again in the middle (cf. sparc).
 165  */
 166
 167 #define JMP_(cont)                              \
 168     do { void *_procedure = (void *)(cont);     \
 169          goto *_procedure;                      \
 170        } while(0)
 171
 172 #define RESUME_(cont)   JMP_(cont)
 173
 174 #define MINI_INTERPRETER_SETUP                  \
 175     StgChar space[RESERVED_C_STACK_BYTES+16*sizeof(long)+10*sizeof(double)];    \
 176     __asm__ volatile ("ldo %0(%%r3),%%r19\n"            \
 177                       "\tstw %%r3, 0(0,%%r19)\n"        \
 178                       "\tstw %%r4, 4(0,%%r19)\n"        \
 179                       "\tstw %%r5, 8(0,%%r19)\n"        \
 180                       "\tstw %%r6,12(0,%%r19)\n"        \
 181                       "\tstw %%r7,16(0,%%r19)\n"        \
 182                       "\tstw %%r8,20(0,%%r19)\n"        \
 183                       "\tstw %%r9,24(0,%%r19)\n"        \
 184                       "\tstw %%r10,28(0,%%r19)\n"       \
 185                       "\tstw %%r11,32(0,%%r19)\n"       \
 186                       "\tstw %%r12,36(0,%%r19)\n"       \
 187                       "\tstw %%r13,40(0,%%r19)\n"       \
 188                       "\tstw %%r14,44(0,%%r19)\n"       \
 189                       "\tstw %%r15,48(0,%%r19)\n"       \
 190                       "\tstw %%r16,52(0,%%r19)\n"       \
 191                       "\tstw %%r17,56(0,%%r19)\n"       \
 192                       "\tstw %%r18,60(0,%%r19)\n"       \
 193                       "\tldo 80(%%r19),%%r19\n"         \
 194                       "\tfstds %%fr12,-16(0,%%r19)\n"   \
 195                       "\tfstds %%fr13, -8(0,%%r19)\n"   \
 196                       "\tfstds %%fr14,  0(0,%%r19)\n"   \
 197                       "\tfstds %%fr15,  8(0,%%r19)\n"   \
 198                       "\tldo 32(%%r19),%%r19\n"         \
 199                       "\tfstds %%fr16,-16(0,%%r19)\n"   \
 200                       "\tfstds %%fr17, -8(0,%%r19)\n"   \
 201                       "\tfstds %%fr18,  0(0,%%r19)\n"   \
 202                       "\tfstds %%fr19,  8(0,%%r19)\n"   \
 203                       "\tldo 32(%%r19),%%r19\n"         \
 204                       "\tfstds %%fr20,-16(0,%%r19)\n"   \
 205                       "\tfstds %%fr21, -8(0,%%r19)\n" : :   \
 206                       "n" (RESERVED_C_STACK_BYTES - (116 * sizeof(long) + 10 * sizeof(double))) : "%r19" );
 207
 208 #define MINI_INTERPRETER_END                    \
 209     __asm__ volatile (".align 4\n"              \
 210                       "\t.EXPORT miniInterpretEnd,CODE\n" \
 211                       "\t.EXPORT miniInterpretEnd,ENTRY,PRIV_LEV=3\n" \
 212                       "miniInterpretEnd\n"              \
 213                       "\tldo %0(%%r3),%%r19\n"          \
 214                       "\tldw  0(0,%%r19),%%r3\n"        \
 215                       "\tldw  4(0,%%r19),%%r4\n"        \
 216                       "\tldw  8(0,%%r19),%%r5\n"        \
 217                       "\tldw 12(0,%%r19),%%r6\n"        \
 218                       "\tldw 16(0,%%r19),%%r7\n"        \
 219                       "\tldw 20(0,%%r19),%%r8\n"        \
 220                       "\tldw 24(0,%%r19),%%r9\n"        \
 221                       "\tldw 28(0,%%r19),%%r10\n"       \
 222                       "\tldw 32(0,%%r19),%%r11\n"       \
 223                       "\tldw 36(0,%%r19),%%r12\n"       \
 224                       "\tldw 40(0,%%r19),%%r13\n"       \
 225                       "\tldw 44(0,%%r19),%%r14\n"       \
 226                       "\tldw 48(0,%%r19),%%r15\n"       \
 227                       "\tldw 52(0,%%r19),%%r16\n"       \
 228                       "\tldw 56(0,%%r19),%%r17\n"       \
 229                       "\tldw 60(0,%%r19),%%r18\n"       \
 230                       "\tldo 80(%%r19),%%r19\n"         \
 231                       "\tfldds -16(0,%%r19),%%fr12\n"   \
 232                       "\tfldds  -8(0,%%r19),%%fr13\n"   \
 233                       "\tfldds   0(0,%%r19),%%fr14\n"   \
 234                       "\tfldds   8(0,%%r19),%%fr15\n"   \
 235                       "\tldo 32(%%r19),%%r19\n"         \
 236                       "\tfldds -16(0,%%r19),%%fr16\n"   \
 237                       "\tfldds  -8(0,%%r19),%%fr17\n"   \
 238                       "\tfldds   0(0,%%r19),%%fr18\n"   \
 239                       "\tfldds   8(0,%%r19),%%fr19\n"   \
 240                       "\tldo 32(%%r19),%%r19\n"         \
 241                       "\tfldds -16(0,%%r19),%%fr20\n"   \
 242                       "\tfldds  -8(0,%%r19),%%fr21\n" : :   \
 243                       "n" (RESERVED_C_STACK_BYTES - (116 * sizeof(long) + 10 * sizeof(double))) : "%r19");
 244
 245 #endif /* hppa1.1-hp-hpux* */
 246 \end{code}
 247
 248 %************************************************************************
 249 %*                                                                      *
 250 \subsubsection[COptJumps-iX86]{Tail-jumping on a 386/486}
 251 %*                                                                      *
 252 %************************************************************************
 253
 254 \begin{code}
 255 #if i386_TARGET_ARCH || i486_TARGET_ARCH
 256
 257 /* do FUNBEGIN/END the easy way */
 258 #define FUNBEGIN    __asm__ volatile ("--- BEGIN ---");
 259 #define FUNEND      __asm__ volatile ("--- END ---");
 260
 261 /* try "m68k-style" for now */
 262 extern void __DISCARD__(STG_NO_ARGS);
 263
 264 #define JMP_(cont)                      \
 265     do { void *target;                  \
 266          __DISCARD__();                 \
 267          target = (void *)(cont);       \
 268          goto *target;                  \
 269        } while(0)
 270
 271 #define RESUME_(target) JMP_(target)
 272
 273 /* The safe part of the stack frame is near the top */
 274
 275 extern P_ SP_stack[];
 276 extern I_ SP_stack_ptr;
 277
 278 #define MINI_INTERPRETER_SETUP                                  \
 279     StgChar space[RESERVED_C_STACK_BYTES+4*sizeof(long)];       \
 280     __asm__ volatile ("leal %c0(%%esp),%%eax\n"                 \
 281                       "\tmovl %%ebx,0(%%eax)\n"                 \
 282                       "\tmovl %%esi,4(%%eax)\n"                 \
 283                       "\tmovl %%edi,8(%%eax)\n"                 \
 284                       "\tmovl %%ebp,12(%%eax)\n"                \
 285                       "\tmovl %%esp,_MainRegTable+100"          \
 286                         : : "n" (RESERVED_C_STACK_BYTES)        \
 287                         : "%eax");                              \
 288     __asm__ volatile ("movl %%esp,%0"                           \
 289                         : "=r" (SP_stack[++SP_stack_ptr]));
 290
 291 #define MINI_INTERPRETER_END                            \
 292     __asm__ volatile (".align 4\n"                      \
 293                       ".globl _miniInterpretEnd\n"      \
 294                       "_miniInterpretEnd:\n"            \
 295                       "\tnop"                           \
 296                         : : : "memory" );               \
 297     __asm__ volatile ("movl %0,%%esp\n"                 \
 298                       "\tmovl %%esp,_MainRegTable+100"  \
 299                         : : "m" (SP_stack[SP_stack_ptr--]) ); \
 300     __asm__ volatile ("leal %c0(%%esp),%%eax\n"         \
 301                       "\tmovl 0(%%eax),%%ebx\n"         \
 302                       "\tmovl 4(%%eax),%%esi\n"         \
 303                       "\tmovl 8(%%eax),%%edi\n"         \
 304                       "\tmovl 12(%%eax),%%ebp"          \
 305                         : : "n" (RESERVED_C_STACK_BYTES) : "%eax");
 306
 307 #endif /* __i[34]86__ */
 308 \end{code}
 309
 310 %************************************************************************
 311 %*                                                                      *
 312 \subsubsection[COptJumps-m68k]{Tail-jumping on m68k boxes}
 313 %*                                                                      *
 314 %************************************************************************
 315
 316 For 680x0s, we use a quite-magic @JMP_@ macro, which includes
 317 beginning- and end-of-function markers.
 318
 319 \begin{code}
 320 #if m68k_TARGET_ARCH
 321
 322 #define FUNBEGIN    __asm__ volatile ("--- BEGIN ---");
 323 #define FUNEND      __asm__ volatile ("--- END ---");
 324 \end{code}
 325
 326 The call to \tr{__DISCARD__} in @JMP_@ is fodder for GCC, to force it
 327 to pop arguments to previous function calls before the end of the
 328 current function.  This is unnecessary if we can manage to compile
 329 with \tr{-fomit-frame-pointer} as well as \tr{-fno-defer-pop}.  (WDP
 330 95/02: Either false or dodgy.) At the moment, the asm mangler removes
 331 these calls to \tr{__DISCARD__}.
 332
 333
 334 \begin{code}
 335 extern void __DISCARD__(STG_NO_ARGS);
 336
 337 #define JMP_(cont)                      \
 338     do { void *target;                  \
 339          __DISCARD__();                 \
 340          target = (void *)(cont);       \
 341          goto *target;                  \
 342     } while(0)
 343
 344 #define RESUME_(target) JMP_(target)
 345
 346 #define MINI_INTERPRETER_SETUP                                  \
 347     StgChar space[RESERVED_C_STACK_BYTES+11*sizeof(long)];      \
 348     __asm__ volatile ("moveml a2-a6/d2-d7,sp@(%c0)\n"           \
 349                       "\tlea sp@(%c0),a6" : : "J" (RESERVED_C_STACK_BYTES));
 350
 351 #define MINI_INTERPRETER_END                            \
 352     __asm__ volatile (".even\n"                         \
 353                       ".globl _miniInterpretEnd\n"      \
 354                       "_miniInterpretEnd:\n"            \
 355                       "\taddqw #4,sp\n"                 \
 356                       "\tmoveml sp@(%c0),a2-a6/d2-d7" : : "J" (RESERVED_C_STACK_BYTES));
 357
 358 #endif /* __m68k__ */
 359 \end{code}
 360
 361 %************************************************************************
 362 %*                                                                      *
 363 \subsubsection[COptJumps-mips]{Tail-jumping on a MIPS box}
 364 %*                                                                      *
 365 %************************************************************************
 366
 367 \begin{code}
 368 #if mipseb_TARGET_ARCH || mipsel_TARGET_ARCH
 369
 370 /* do FUNBEGIN/END the easy way */
 371 #define FUNBEGIN    __asm__ volatile ("--- BEGIN ---");
 372 #define FUNEND      __asm__ volatile ("--- END ---");
 373
 374 /* try "m68k-style" for now */
 375 extern void __DISCARD__(STG_NO_ARGS);
 376
 377 /* this is "alpha-style" */
 378 #define JMP_(cont)                              \
 379     do { __DISCARD__();                         \
 380          _procedure = (void *)(cont);           \
 381          goto *_procedure;                      \
 382        } while(0)
 383
 384 #define RESUME_(target) JMP_(target)
 385
 386 /* _All_ callee-saved regs, whether we steal them or not, must be saved
 387    (and restored).
 388 */
 389
 390 #define MINI_INTERPRETER_SETUP                  \
 391     StgChar space[RESERVED_C_STACK_BYTES+6*sizeof(double)+9*sizeof(long)]; \
 392     __asm__ volatile ("addu $2,$sp,%0\n"        \
 393                       "\ts.d $f20,0($2)\n"      \
 394                       "\ts.d $f22,8($2)\n"      \
 395                       "\ts.d $f24,16($2)\n"     \
 396                       "\ts.d $f26,24($2)\n"     \
 397                       "\ts.d $f28,32($2)\n"     \
 398                       "\ts.d $f30,40($2)\n"     \
 399                       "\tsw  $16,48($2)\n"      \
 400                       "\tsw  $17,52($2)\n"      \
 401                       "\tsw  $18,56($2)\n"      \
 402                       "\tsw  $19,60($2)\n"      \
 403                       "\tsw  $20,64($2)\n"      \
 404                       "\tsw  $21,68($2)\n"      \
 405                       "\tsw  $22,72($2)\n"      \
 406                       "\tsw  $23,76($2)\n"      \
 407                       "\tsw  $fp,80($2)\n"      \
 408                       : : "I" (RESERVED_C_STACK_BYTES+16) : "$2" );
 409
 410     /* the 16 bytes is for the argument-register save-area above $sp */
 411
 412 #define MINI_INTERPRETER_END                    \
 413     __asm__ volatile (".align 2\n"              \
 414                       ".globl miniInterpretEnd\n" \
 415                       "miniInterpretEnd:\n"     \
 416                       "\taddu $2,$sp,%0\n"      \
 417                       "\tl.d $f20,0($2)\n"      \
 418                       "\tl.d $f22,8($2)\n"      \
 419                       "\tl.d $f24,16($2)\n"     \
 420                       "\tl.d $f26,24($2)\n"     \
 421                       "\tl.d $f28,32($2)\n"     \
 422                       "\tl.d $f30,40($2)\n"     \
 423                       "\tlw  $16,48($2)\n"      \
 424                       "\tlw  $17,52($2)\n"      \
 425                       "\tlw  $18,56($2)\n"      \
 426                       "\tlw  $19,60($2)\n"      \
 427                       "\tlw  $20,64($2)\n"      \
 428                       "\tlw  $21,68($2)\n"      \
 429                       "\tlw  $22,72($2)\n"      \
 430                       "\tlw  $23,76($2)\n"      \
 431                       "\tlw  $fp,80($2)\n"      \
 432                       : : "I" (RESERVED_C_STACK_BYTES+16) : "$2" );
 433
 434 #endif /* mips */
 435 \end{code}
 436
 437 %************************************************************************
 438 %*                                                                      *
 439 \subsubsection[COptJumps-RS6000]{Tail-jumping on an IBM RS6000 running AIX}
 440 %*                                                                      *
 441 %************************************************************************
 442
 443 \begin{code}
 444 #if rs6000_ibm_aix_TARGET
 445
 446 #define JMP_(cont)      ((F_) (cont))()
 447 /* partain: untested */
 448
 449 #endif /* rs6000-ibm-aix* */
 450 \end{code}
 451
 452 %************************************************************************
 453 %*                                                                      *
 454 \subsubsection[COptJumps-sparc]{Tail-jumping on Sun4s}
 455 %*                                                                      *
 456 %************************************************************************
 457
 458 We want tailjumps to be calls, because `call xxx' is the only Sparc branch
 459 that allows an arbitrary label as a target.  (Gcc's ``goto *target'' construct
 460 ends up loading the label into a register and then jumping, at the cost of
 461 two extra instructions for the 32-bit load.)
 462
 463 When entering the threaded world, we stash our return address in a known
 464 location so that \tr{%i7} is available as an extra callee-saves register.
 465 Of course, we have to restore this when coming out of the threaded world.
 466
 467 I hate this god-forsaken architecture.  Since the top of the reserved
 468 stack space is used for globals and the bottom is reserved for outgoing arguments,
 469 we have to stick our return address somewhere in the middle.  Currently, I'm
 470 allowing 100 extra outgoing arguments beyond the first 6.  --JSM
 471
 472 \begin{code}
 473 #if sparc_TARGET_ARCH
 474
 475 #ifdef solaris2_TARGET_OS
 476 #define MINI_INTERPRET_END   "miniInterpretEnd"
 477 #else
 478 #define MINI_INTERPRET_END   "_miniInterpretEnd"
 479 #endif
 480
 481 #define JMP_(cont)      ((F_) (cont))()
 482         /* Oh so happily, the above turns into a "call" instruction,
 483            which, on a SPARC, is nothing but a "jmpl" with the
 484            return address in %o7 [which we don't care about].
 485         */
 486 #define RESUME_(target) JMP_(target)
 487
 488 #define MINI_INTERPRETER_SETUP                  \
 489     StgChar space[RESERVED_C_STACK_BYTES+sizeof(void *)];       \
 490     register void *i7 __asm__("%i7");           \
 491     ((void **)(space))[100] = i7;
 492
 493 #define MINI_INTERPRETER_END                    \
 494     __asm__ volatile (".align 4\n"              \
 495             ".global " MINI_INTERPRET_END "\n"  \
 496             MINI_INTERPRET_END ":\n"            \
 497             "\tld %1,%0" : "=r" (i7) : "m" (((void **)(space))[100]));
 498
 499 #endif /* __sparc__ */
 500 \end{code}
 501
 502 %************************************************************************
 503 %*                                                                      *
 504 \subsubsection[COptJumps-OOPS]{Someone screwed up here, too...}
 505 %*                                                                      *
 506 %************************************************************************
 507
 508 If one of the above machine-dependent sections wasn't triggered,
 509 @JMP_@ won't be defined and you'll get link errors (if not
 510 C-compiler errors).
 511
 512 \begin{code}
 513 #if !defined(JMP_)
 514 *???????* No JMP_ macro???
 515 #endif
 516
 517 #endif /* __STG_TAILJUMPS__ */
 518 \end{code}
 519
 520 If @FUNBEGIN@ and @FUNEND@ weren't defined, give them the default
 521 (nothing).  Also, define @FB_@ and @FE_@ (short forms).
 522 \begin{code}
 523 #if ! defined(FUNBEGIN)
 524 #define FUNBEGIN /* nothing */
 525 #endif
 526 #if ! defined(FUNEND)
 527 #define FUNEND   /* nothing */
 528 #endif
 529
 530 #define FB_     FUNBEGIN        /* short forms */
 531 #define FE_     FUNEND
 532
 533 #endif /* ! that's all of... COPTJUMPS_H */
 534 \end{code}