gcc/dwarf2asm.c

   1 /* Dwarf2 assembler output helper routines.
   2    Copyright (C) 2001 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 2, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING.  If not, write to the Free
  18 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  19 02111-1307, USA.  */
  20
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "flags.h"
  25 #include "tree.h"
  26 #include "rtl.h"
  27 #include "output.h"
  28 #include "dwarf2asm.h"
  29 #include "dwarf2.h"
  30 #include "splay-tree.h"
  31 #include "ggc.h"
  32 #include "tm_p.h"
  33
  34
  35 /* How to start an assembler comment.  */
  36 #ifndef ASM_COMMENT_START
  37 #define ASM_COMMENT_START ";#"
  38 #endif
  39
  40 /* We don't have unaligned support, let's hope the normal output works for
  41    .debug_frame.  But we know it won't work for .debug_info.  */
  42 #if !defined(UNALIGNED_INT_ASM_OP) && defined(DWARF2_DEBUGGING_INFO)
  43  #error DWARF2_DEBUGGING_INFO requires UNALIGNED_INT_ASM_OP.
  44 #endif
  45
  46 \f
  47 /* Despite the fact that assemble_integer handles unaligned data,
  48    continue emitting things by hand when possible, since that makes
  49    the assembler commentary come out prettier.  */
  50 #ifdef UNALIGNED_INT_ASM_OP
  51 static const char * unaligned_integer_asm_op  PARAMS ((int));
  52
  53 static inline const char *
  54 unaligned_integer_asm_op (size)
  55      int size;
  56 {
  57   const char *op = NULL;
  58   switch (size)
  59     {
  60     case 1:
  61       op = ASM_BYTE_OP;
  62       break;
  63     case 2:
  64       op = UNALIGNED_SHORT_ASM_OP;
  65       break;
  66     case 4:
  67       op = UNALIGNED_INT_ASM_OP;
  68       break;
  69     case 8:
  70 #ifdef UNALIGNED_DOUBLE_INT_ASM_OP
  71       op = UNALIGNED_DOUBLE_INT_ASM_OP;
  72       break;
  73 #endif
  74     default:
  75       abort ();
  76     }
  77
  78   if (! op)
  79     abort ();
  80
  81   return op;
  82 }
  83 #endif /* UNALIGNED_INT_ASM_OP */
  84
  85 /* Output an immediate constant in a given size.  */
  86
  87 void
  88 dw2_asm_output_data VPARAMS ((int size, unsigned HOST_WIDE_INT value,
  89                               const char *comment, ...))
  90 {
  91   VA_OPEN (ap, comment);
  92   VA_FIXEDARG (ap, int, size);
  93   VA_FIXEDARG (ap, unsigned HOST_WIDE_INT, value);
  94   VA_FIXEDARG (ap, const char *, comment);
  95
  96   if (size * 8 < HOST_BITS_PER_WIDE_INT)
  97     value &= ~(~(unsigned HOST_WIDE_INT)0 << (size * 8));
  98
  99 #ifdef UNALIGNED_INT_ASM_OP
 100   fputs (unaligned_integer_asm_op (size), asm_out_file);
 101   fprintf (asm_out_file, HOST_WIDE_INT_PRINT_HEX, value);
 102 #else
 103   assemble_integer (GEN_INT (value), size, BITS_PER_UNIT, 1);
 104 #endif
 105
 106   if (flag_debug_asm && comment)
 107     {
 108       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 109       vfprintf (asm_out_file, comment, ap);
 110     }
 111   fputc ('\n', asm_out_file);
 112
 113   VA_CLOSE (ap);
 114 }
 115
 116 /* Output the difference between two symbols in a given size.  */
 117 /* ??? There appear to be assemblers that do not like such
 118    subtraction, but do support ASM_SET_OP.  It's unfortunately
 119    impossible to do here, since the ASM_SET_OP for the difference
 120    symbol must appear after both symbols are defined.  */
 121
 122 void
 123 dw2_asm_output_delta VPARAMS ((int size, const char *lab1, const char *lab2,
 124                                const char *comment, ...))
 125 {
 126   VA_OPEN (ap, comment);
 127   VA_FIXEDARG (ap, int, size);
 128   VA_FIXEDARG (ap, const char *, lab1);
 129   VA_FIXEDARG (ap, const char *, lab2);
 130   VA_FIXEDARG (ap, const char *, comment);
 131
 132 #ifdef UNALIGNED_INT_ASM_OP
 133   fputs (unaligned_integer_asm_op (size), asm_out_file);
 134   assemble_name (asm_out_file, lab1);
 135   fputc ('-', asm_out_file);
 136   assemble_name (asm_out_file, lab2);
 137 #else
 138   assemble_integer (gen_rtx_MINUS (Pmode, gen_rtx_SYMBOL_REF (Pmode, lab1),
 139                                    gen_rtx_SYMBOL_REF (Pmode, lab2)),
 140                     size, BITS_PER_UNIT, 1);
 141 #endif
 142
 143   if (flag_debug_asm && comment)
 144     {
 145       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 146       vfprintf (asm_out_file, comment, ap);
 147     }
 148   fputc ('\n', asm_out_file);
 149
 150   VA_CLOSE (ap);
 151 }
 152
 153 /* Output a section-relative reference to a label.  In general this
 154    can only be done for debugging symbols.  E.g. on most targets with
 155    the GNU linker, this is accomplished with a direct reference and
 156    the knowledge that the debugging section will be placed at VMA 0.
 157    Some targets have special relocations for this that we must use.  */
 158
 159 void
 160 dw2_asm_output_offset VPARAMS ((int size, const char *label,
 161                                const char *comment, ...))
 162 {
 163   VA_OPEN (ap, comment);
 164   VA_FIXEDARG (ap, int, size);
 165   VA_FIXEDARG (ap, const char *, label);
 166   VA_FIXEDARG (ap, const char *, comment);
 167
 168 #ifdef ASM_OUTPUT_DWARF_OFFSET
 169   ASM_OUTPUT_DWARF_OFFSET (asm_out_file, size, label);
 170 #else
 171 #ifdef UNALIGNED_INT_ASM_OP
 172   fputs (unaligned_integer_asm_op (size), asm_out_file);
 173   assemble_name (asm_out_file, label);
 174 #else
 175   assemble_integer (gen_rtx_SYMBOL_REF (Pmode, label), size, BITS_PER_UNIT, 1);
 176 #endif
 177 #endif
 178
 179   if (flag_debug_asm && comment)
 180     {
 181       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 182       vfprintf (asm_out_file, comment, ap);
 183     }
 184   fputc ('\n', asm_out_file);
 185
 186   VA_CLOSE (ap);
 187 }
 188
 189 /* Output a self-relative reference to a label, possibly in a
 190    different section or object file.  */
 191
 192 void
 193 dw2_asm_output_pcrel VPARAMS ((int size ATTRIBUTE_UNUSED,
 194                                const char *label ATTRIBUTE_UNUSED,
 195                                const char *comment, ...))
 196 {
 197   VA_OPEN (ap, comment);
 198   VA_FIXEDARG (ap, int, size);
 199   VA_FIXEDARG (ap, const char *, label);
 200   VA_FIXEDARG (ap, const char *, comment);
 201
 202 #ifdef ASM_OUTPUT_DWARF_PCREL
 203   ASM_OUTPUT_DWARF_PCREL (asm_out_file, size, label);
 204 #else
 205 #ifdef UNALIGNED_INT_ASM_OP
 206   fputs (unaligned_integer_asm_op (size), asm_out_file);
 207   assemble_name (asm_out_file, label);
 208   fputc ('-', asm_out_file);
 209   fputc ('.', asm_out_file);
 210 #else
 211   abort ();
 212 #endif
 213 #endif
 214
 215   if (flag_debug_asm && comment)
 216     {
 217       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 218       vfprintf (asm_out_file, comment, ap);
 219     }
 220   fputc ('\n', asm_out_file);
 221
 222   VA_CLOSE (ap);
 223 }
 224
 225 /* Output an absolute reference to a label.  */
 226
 227 void
 228 dw2_asm_output_addr VPARAMS ((int size, const char *label,
 229                               const char *comment, ...))
 230 {
 231   VA_OPEN (ap, comment);
 232   VA_FIXEDARG (ap, int, size);
 233   VA_FIXEDARG (ap, const char *, label);
 234   VA_FIXEDARG (ap, const char *, comment);
 235
 236 #ifdef UNALIGNED_INT_ASM_OP
 237   fputs (unaligned_integer_asm_op (size), asm_out_file);
 238   assemble_name (asm_out_file, label);
 239 #else
 240   assemble_integer (gen_rtx_SYMBOL_REF (Pmode, label), size, BITS_PER_UNIT, 1);
 241 #endif
 242
 243   if (flag_debug_asm && comment)
 244     {
 245       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 246       vfprintf (asm_out_file, comment, ap);
 247     }
 248   fputc ('\n', asm_out_file);
 249
 250   VA_CLOSE (ap);
 251 }
 252
 253 /* Similar, but use an RTX expression instead of a text label.  */
 254
 255 void
 256 dw2_asm_output_addr_rtx VPARAMS ((int size, rtx addr,
 257                                   const char *comment, ...))
 258 {
 259   VA_OPEN (ap, comment);
 260   VA_FIXEDARG (ap, int, size);
 261   VA_FIXEDARG (ap, rtx, addr);
 262   VA_FIXEDARG (ap, const char *, comment);
 263
 264 #ifdef UNALIGNED_INT_ASM_OP
 265   fputs (unaligned_integer_asm_op (size), asm_out_file);
 266   output_addr_const (asm_out_file, addr);
 267 #else
 268   assemble_integer (addr, size, BITS_PER_UNIT, 1);
 269 #endif
 270
 271   if (flag_debug_asm && comment)
 272     {
 273       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 274       vfprintf (asm_out_file, comment, ap);
 275     }
 276   fputc ('\n', asm_out_file);
 277
 278   VA_CLOSE (ap);
 279 }
 280
 281 void
 282 dw2_asm_output_nstring VPARAMS ((const char *str, size_t orig_len,
 283                                  const char *comment, ...))
 284 {
 285   size_t i, len;
 286
 287   VA_OPEN (ap, comment);
 288   VA_FIXEDARG (ap, const char *, str);
 289   VA_FIXEDARG (ap, size_t, orig_len);
 290   VA_FIXEDARG (ap, const char *, comment);
 291
 292   len = orig_len;
 293
 294   if (len == (size_t) -1)
 295     len = strlen (str);
 296
 297   if (flag_debug_asm && comment)
 298     {
 299       fputs ("\t.ascii \"", asm_out_file);
 300       for (i = 0; i < len; i++)
 301         {
 302           int c = str[i];
 303           if (c == '\"' || c == '\\')
 304             fputc ('\\', asm_out_file);
 305           if (ISPRINT(c))
 306             fputc (c, asm_out_file);
 307           else
 308             fprintf (asm_out_file, "\\%o", c);
 309         }
 310       fprintf (asm_out_file, "\\0\"\t%s ", ASM_COMMENT_START);
 311       vfprintf (asm_out_file, comment, ap);
 312       fputc ('\n', asm_out_file);
 313     }
 314   else
 315     {
 316       /* If an explicit length was given, we can't assume there
 317          is a null termination in the string buffer.  */
 318       if (orig_len == (size_t) -1)
 319         len += 1;
 320       ASM_OUTPUT_ASCII (asm_out_file, str, len);
 321       if (orig_len != (size_t) -1)
 322         fprintf (asm_out_file, "%s0\n", ASM_BYTE_OP);
 323     }
 324
 325   VA_CLOSE (ap);
 326 }
 327 \f
 328
 329 /* Return the size of an unsigned LEB128 quantity.  */
 330
 331 int
 332 size_of_uleb128 (value)
 333      unsigned HOST_WIDE_INT value;
 334 {
 335   int size = 0, byte;
 336
 337   do
 338     {
 339       byte = (value & 0x7f);
 340       value >>= 7;
 341       size += 1;
 342     }
 343   while (value != 0);
 344
 345   return size;
 346 }
 347
 348 /* Return the size of a signed LEB128 quantity.  */
 349
 350 int
 351 size_of_sleb128 (value)
 352      HOST_WIDE_INT value;
 353 {
 354   int size = 0, byte;
 355
 356   do
 357     {
 358       byte = (value & 0x7f);
 359       value >>= 7;
 360       size += 1;
 361     }
 362   while (!((value == 0 && (byte & 0x40) == 0)
 363            || (value == -1 && (byte & 0x40) != 0)));
 364
 365   return size;
 366 }
 367
 368 /* Given an encoding, return the number of bytes the format occupies.
 369    This is only defined for fixed-size encodings, and so does not
 370    include leb128.  */
 371
 372 int
 373 size_of_encoded_value (encoding)
 374      int encoding;
 375 {
 376   if (encoding == DW_EH_PE_omit)
 377     return 0;
 378
 379   switch (encoding & 0x07)
 380     {
 381     case DW_EH_PE_absptr:
 382       return POINTER_SIZE / BITS_PER_UNIT;
 383     case DW_EH_PE_udata2:
 384       return 2;
 385     case DW_EH_PE_udata4:
 386       return 4;
 387     case DW_EH_PE_udata8:
 388       return 8;
 389     }
 390   abort ();
 391 }
 392
 393 /* Yield a name for a given pointer encoding.  */
 394
 395 const char *
 396 eh_data_format_name (format)
 397      int format;
 398 {
 399 #if HAVE_DESIGNATED_INITIALIZERS
 400 #define S(p, v)         [p] = v,
 401 #else
 402 #define S(p, v)         case p: return v;
 403 #endif
 404
 405 #if HAVE_DESIGNATED_INITIALIZERS
 406   __extension__ static const char * const format_names[256] = {
 407 #else
 408   switch (format) {
 409 #endif
 410
 411   S(DW_EH_PE_absptr, "absolute")
 412   S(DW_EH_PE_omit, "omit")
 413   S(DW_EH_PE_aligned, "aligned absolute")
 414
 415   S(DW_EH_PE_uleb128, "uleb128")
 416   S(DW_EH_PE_udata2, "udata2")
 417   S(DW_EH_PE_udata4, "udata4")
 418   S(DW_EH_PE_udata8, "udata8")
 419   S(DW_EH_PE_sleb128, "sleb128")
 420   S(DW_EH_PE_sdata2, "sdata2")
 421   S(DW_EH_PE_sdata4, "sdata4")
 422   S(DW_EH_PE_sdata8, "sdata8")
 423
 424   S(DW_EH_PE_absptr | DW_EH_PE_pcrel, "pcrel")
 425   S(DW_EH_PE_uleb128 | DW_EH_PE_pcrel, "pcrel uleb128")
 426   S(DW_EH_PE_udata2 | DW_EH_PE_pcrel, "pcrel udata2")
 427   S(DW_EH_PE_udata4 | DW_EH_PE_pcrel, "pcrel udata4")
 428   S(DW_EH_PE_udata8 | DW_EH_PE_pcrel, "pcrel udata8")
 429   S(DW_EH_PE_sleb128 | DW_EH_PE_pcrel, "pcrel sleb128")
 430   S(DW_EH_PE_sdata2 | DW_EH_PE_pcrel, "pcrel sdata2")
 431   S(DW_EH_PE_sdata4 | DW_EH_PE_pcrel, "pcrel sdata4")
 432   S(DW_EH_PE_sdata8 | DW_EH_PE_pcrel, "pcrel sdata8")
 433
 434   S(DW_EH_PE_absptr | DW_EH_PE_textrel, "textrel")
 435   S(DW_EH_PE_uleb128 | DW_EH_PE_textrel, "textrel uleb128")
 436   S(DW_EH_PE_udata2 | DW_EH_PE_textrel, "textrel udata2")
 437   S(DW_EH_PE_udata4 | DW_EH_PE_textrel, "textrel udata4")
 438   S(DW_EH_PE_udata8 | DW_EH_PE_textrel, "textrel udata8")
 439   S(DW_EH_PE_sleb128 | DW_EH_PE_textrel, "textrel sleb128")
 440   S(DW_EH_PE_sdata2 | DW_EH_PE_textrel, "textrel sdata2")
 441   S(DW_EH_PE_sdata4 | DW_EH_PE_textrel, "textrel sdata4")
 442   S(DW_EH_PE_sdata8 | DW_EH_PE_textrel, "textrel sdata8")
 443
 444   S(DW_EH_PE_absptr | DW_EH_PE_datarel, "datarel")
 445   S(DW_EH_PE_uleb128 | DW_EH_PE_datarel, "datarel uleb128")
 446   S(DW_EH_PE_udata2 | DW_EH_PE_datarel, "datarel udata2")
 447   S(DW_EH_PE_udata4 | DW_EH_PE_datarel, "datarel udata4")
 448   S(DW_EH_PE_udata8 | DW_EH_PE_datarel, "datarel udata8")
 449   S(DW_EH_PE_sleb128 | DW_EH_PE_datarel, "datarel sleb128")
 450   S(DW_EH_PE_sdata2 | DW_EH_PE_datarel, "datarel sdata2")
 451   S(DW_EH_PE_sdata4 | DW_EH_PE_datarel, "datarel sdata4")
 452   S(DW_EH_PE_sdata8 | DW_EH_PE_datarel, "datarel sdata8")
 453
 454   S(DW_EH_PE_absptr | DW_EH_PE_funcrel, "funcrel")
 455   S(DW_EH_PE_uleb128 | DW_EH_PE_funcrel, "funcrel uleb128")
 456   S(DW_EH_PE_udata2 | DW_EH_PE_funcrel, "funcrel udata2")
 457   S(DW_EH_PE_udata4 | DW_EH_PE_funcrel, "funcrel udata4")
 458   S(DW_EH_PE_udata8 | DW_EH_PE_funcrel, "funcrel udata8")
 459   S(DW_EH_PE_sleb128 | DW_EH_PE_funcrel, "funcrel sleb128")
 460   S(DW_EH_PE_sdata2 | DW_EH_PE_funcrel, "funcrel sdata2")
 461   S(DW_EH_PE_sdata4 | DW_EH_PE_funcrel, "funcrel sdata4")
 462   S(DW_EH_PE_sdata8 | DW_EH_PE_funcrel, "funcrel sdata8")
 463
 464   S(DW_EH_PE_indirect | DW_EH_PE_absptr | DW_EH_PE_pcrel,
 465     "indirect pcrel")
 466   S(DW_EH_PE_indirect | DW_EH_PE_uleb128 | DW_EH_PE_pcrel,
 467     "indirect pcrel uleb128")
 468   S(DW_EH_PE_indirect | DW_EH_PE_udata2 | DW_EH_PE_pcrel,
 469     "indirect pcrel udata2")
 470   S(DW_EH_PE_indirect | DW_EH_PE_udata4 | DW_EH_PE_pcrel,
 471     "indirect pcrel udata4")
 472   S(DW_EH_PE_indirect | DW_EH_PE_udata8 | DW_EH_PE_pcrel,
 473     "indirect pcrel udata8")
 474   S(DW_EH_PE_indirect | DW_EH_PE_sleb128 | DW_EH_PE_pcrel,
 475     "indirect pcrel sleb128")
 476   S(DW_EH_PE_indirect | DW_EH_PE_sdata2 | DW_EH_PE_pcrel,
 477     "indirect pcrel sdata2")
 478   S(DW_EH_PE_indirect | DW_EH_PE_sdata4 | DW_EH_PE_pcrel,
 479     "indirect pcrel sdata4")
 480   S(DW_EH_PE_indirect | DW_EH_PE_sdata8 | DW_EH_PE_pcrel,
 481     "indirect pcrel sdata8")
 482
 483   S(DW_EH_PE_indirect | DW_EH_PE_absptr | DW_EH_PE_textrel,
 484     "indirect textrel")
 485   S(DW_EH_PE_indirect | DW_EH_PE_uleb128 | DW_EH_PE_textrel,
 486     "indirect textrel uleb128")
 487   S(DW_EH_PE_indirect | DW_EH_PE_udata2 | DW_EH_PE_textrel,
 488     "indirect textrel udata2")
 489   S(DW_EH_PE_indirect | DW_EH_PE_udata4 | DW_EH_PE_textrel,
 490     "indirect textrel udata4")
 491   S(DW_EH_PE_indirect | DW_EH_PE_udata8 | DW_EH_PE_textrel,
 492     "indirect textrel udata8")
 493   S(DW_EH_PE_indirect | DW_EH_PE_sleb128 | DW_EH_PE_textrel,
 494     "indirect textrel sleb128")
 495   S(DW_EH_PE_indirect | DW_EH_PE_sdata2 | DW_EH_PE_textrel,
 496     "indirect textrel sdata2")
 497   S(DW_EH_PE_indirect | DW_EH_PE_sdata4 | DW_EH_PE_textrel,
 498     "indirect textrel sdata4")
 499   S(DW_EH_PE_indirect | DW_EH_PE_sdata8 | DW_EH_PE_textrel,
 500     "indirect textrel sdata8")
 501
 502   S(DW_EH_PE_indirect | DW_EH_PE_absptr | DW_EH_PE_datarel,
 503     "indirect datarel")
 504   S(DW_EH_PE_indirect | DW_EH_PE_uleb128 | DW_EH_PE_datarel,
 505     "indirect datarel uleb128")
 506   S(DW_EH_PE_indirect | DW_EH_PE_udata2 | DW_EH_PE_datarel,
 507     "indirect datarel udata2")
 508   S(DW_EH_PE_indirect | DW_EH_PE_udata4 | DW_EH_PE_datarel,
 509     "indirect datarel udata4")
 510   S(DW_EH_PE_indirect | DW_EH_PE_udata8 | DW_EH_PE_datarel,
 511     "indirect datarel udata8")
 512   S(DW_EH_PE_indirect | DW_EH_PE_sleb128 | DW_EH_PE_datarel,
 513     "indirect datarel sleb128")
 514   S(DW_EH_PE_indirect | DW_EH_PE_sdata2 | DW_EH_PE_datarel,
 515     "indirect datarel sdata2")
 516   S(DW_EH_PE_indirect | DW_EH_PE_sdata4 | DW_EH_PE_datarel,
 517     "indirect datarel sdata4")
 518   S(DW_EH_PE_indirect | DW_EH_PE_sdata8 | DW_EH_PE_datarel,
 519     "indirect datarel sdata8")
 520
 521   S(DW_EH_PE_indirect | DW_EH_PE_absptr | DW_EH_PE_funcrel,
 522     "indirect funcrel")
 523   S(DW_EH_PE_indirect | DW_EH_PE_uleb128 | DW_EH_PE_funcrel,
 524     "indirect funcrel uleb128")
 525   S(DW_EH_PE_indirect | DW_EH_PE_udata2 | DW_EH_PE_funcrel,
 526     "indirect funcrel udata2")
 527   S(DW_EH_PE_indirect | DW_EH_PE_udata4 | DW_EH_PE_funcrel,
 528     "indirect funcrel udata4")
 529   S(DW_EH_PE_indirect | DW_EH_PE_udata8 | DW_EH_PE_funcrel,
 530     "indirect funcrel udata8")
 531   S(DW_EH_PE_indirect | DW_EH_PE_sleb128 | DW_EH_PE_funcrel,
 532     "indirect funcrel sleb128")
 533   S(DW_EH_PE_indirect | DW_EH_PE_sdata2 | DW_EH_PE_funcrel,
 534     "indirect funcrel sdata2")
 535   S(DW_EH_PE_indirect | DW_EH_PE_sdata4 | DW_EH_PE_funcrel,
 536     "indirect funcrel sdata4")
 537   S(DW_EH_PE_indirect | DW_EH_PE_sdata8 | DW_EH_PE_funcrel,
 538     "indirect funcrel sdata8")
 539
 540 #if HAVE_DESIGNATED_INITIALIZERS
 541   };
 542
 543   if (format < 0 || format > 0xff || format_names[format] == NULL)
 544     abort ();
 545   return format_names[format];
 546 #else
 547   }
 548   abort ();
 549 #endif
 550 }
 551
 552 /* Output an unsigned LEB128 quantity.  */
 553
 554 void
 555 dw2_asm_output_data_uleb128 VPARAMS ((unsigned HOST_WIDE_INT value,
 556                                       const char *comment, ...))
 557 {
 558   VA_OPEN (ap, comment);
 559   VA_FIXEDARG (ap, unsigned HOST_WIDE_INT, value);
 560   VA_FIXEDARG (ap, const char *, comment);
 561
 562 #ifdef HAVE_AS_LEB128
 563   fputs ("\t.uleb128 ", asm_out_file);
 564   fprintf (asm_out_file, HOST_WIDE_INT_PRINT_HEX, value);
 565
 566   if (flag_debug_asm && comment)
 567     {
 568       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 569       vfprintf (asm_out_file, comment, ap);
 570     }
 571 #else
 572   {
 573     unsigned HOST_WIDE_INT work = value;
 574
 575     fputs (ASM_BYTE_OP, asm_out_file);
 576     do
 577       {
 578         int byte = (work & 0x7f);
 579         work >>= 7;
 580         if (work != 0)
 581           /* More bytes to follow.  */
 582           byte |= 0x80;
 583
 584         fprintf (asm_out_file, "0x%x", byte);
 585         if (work != 0)
 586           fputc (',', asm_out_file);
 587       }
 588     while (work != 0);
 589
 590   if (flag_debug_asm)
 591     {
 592       fprintf (asm_out_file, "\t%s uleb128 ", ASM_COMMENT_START);
 593       fprintf (asm_out_file, HOST_WIDE_INT_PRINT_HEX, value);
 594       if (comment)
 595         {
 596           fputs ("; ", asm_out_file);
 597           vfprintf (asm_out_file, comment, ap);
 598         }
 599     }
 600   }
 601 #endif
 602   fputc ('\n', asm_out_file);
 603
 604   VA_CLOSE (ap);
 605 }
 606
 607 /* Output an signed LEB128 quantity.  */
 608
 609 void
 610 dw2_asm_output_data_sleb128 VPARAMS ((HOST_WIDE_INT value,
 611                                       const char *comment, ...))
 612 {
 613   VA_OPEN (ap, comment);
 614   VA_FIXEDARG (ap, HOST_WIDE_INT, value);
 615   VA_FIXEDARG (ap, const char *, comment);
 616
 617 #ifdef HAVE_AS_LEB128
 618   fputs ("\t.sleb128 ", asm_out_file);
 619   fprintf (asm_out_file, HOST_WIDE_INT_PRINT_DEC, value);
 620
 621   if (flag_debug_asm && comment)
 622     {
 623       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 624       vfprintf (asm_out_file, comment, ap);
 625     }
 626 #else
 627   {
 628     HOST_WIDE_INT work = value;
 629     int more, byte;
 630
 631     fputs (ASM_BYTE_OP, asm_out_file);
 632     do
 633       {
 634         byte = (work & 0x7f);
 635         /* arithmetic shift */
 636         work >>= 7;
 637         more = !((work == 0 && (byte & 0x40) == 0)
 638                  || (work == -1 && (byte & 0x40) != 0));
 639         if (more)
 640           byte |= 0x80;
 641
 642         fprintf (asm_out_file, "0x%x", byte);
 643         if (more)
 644           fputc (',', asm_out_file);
 645       }
 646     while (more);
 647
 648   if (flag_debug_asm)
 649     {
 650       fprintf (asm_out_file, "\t%s sleb128 ", ASM_COMMENT_START);
 651       fprintf (asm_out_file, HOST_WIDE_INT_PRINT_DEC, value);
 652       if (comment)
 653         {
 654           fputs ("; ", asm_out_file);
 655           vfprintf (asm_out_file, comment, ap);
 656         }
 657     }
 658   }
 659 #endif
 660   fputc ('\n', asm_out_file);
 661
 662   VA_CLOSE (ap);
 663 }
 664
 665 void
 666 dw2_asm_output_delta_uleb128 VPARAMS ((const char *lab1 ATTRIBUTE_UNUSED,
 667                                        const char *lab2 ATTRIBUTE_UNUSED,
 668                                        const char *comment, ...))
 669 {
 670   VA_OPEN (ap, comment);
 671   VA_FIXEDARG (ap, const char *, lab1);
 672   VA_FIXEDARG (ap, const char *, lab2);
 673   VA_FIXEDARG (ap, const char *, comment);
 674
 675 #ifdef HAVE_AS_LEB128
 676   fputs ("\t.uleb128 ", asm_out_file);
 677   assemble_name (asm_out_file, lab1);
 678   fputc ('-', asm_out_file);
 679   assemble_name (asm_out_file, lab2);
 680 #else
 681   abort ();
 682 #endif
 683
 684   if (flag_debug_asm && comment)
 685     {
 686       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 687       vfprintf (asm_out_file, comment, ap);
 688     }
 689   fputc ('\n', asm_out_file);
 690
 691   VA_CLOSE (ap);
 692 }
 693
 694 void
 695 dw2_asm_output_delta_sleb128 VPARAMS ((const char *lab1 ATTRIBUTE_UNUSED,
 696                                        const char *lab2 ATTRIBUTE_UNUSED,
 697                                        const char *comment, ...))
 698 {
 699   VA_OPEN (ap, comment);
 700   VA_FIXEDARG (ap, const char *, lab1);
 701   VA_FIXEDARG (ap, const char *, lab2);
 702   VA_FIXEDARG (ap, const char *, comment);
 703
 704 #ifdef HAVE_AS_LEB128
 705   fputs ("\t.sleb128 ", asm_out_file);
 706   assemble_name (asm_out_file, lab1);
 707   fputc ('-', asm_out_file);
 708   assemble_name (asm_out_file, lab2);
 709 #else
 710   abort ();
 711 #endif
 712
 713   if (flag_debug_asm && comment)
 714     {
 715       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 716       vfprintf (asm_out_file, comment, ap);
 717     }
 718   fputc ('\n', asm_out_file);
 719
 720   VA_CLOSE (ap);
 721 }
 722 \f
 723 static int mark_indirect_pool_entry PARAMS ((splay_tree_node, void *));
 724 static void mark_indirect_pool PARAMS ((PTR arg));
 725 static rtx dw2_force_const_mem PARAMS ((rtx));
 726 static int dw2_output_indirect_constant_1 PARAMS ((splay_tree_node, void *));
 727
 728 static splay_tree indirect_pool;
 729
 730 #if defined(HAVE_GAS_HIDDEN) && defined(SUPPORTS_ONE_ONLY)
 731 # define USE_LINKONCE_INDIRECT 1
 732 #else
 733 # define USE_LINKONCE_INDIRECT 0
 734 #endif
 735
 736 /* Mark all indirect constants for GC.  */
 737
 738 static int
 739 mark_indirect_pool_entry (node, data)
 740      splay_tree_node node;
 741      void* data ATTRIBUTE_UNUSED;
 742 {
 743   ggc_mark_nonnull_tree ((tree) node->value);
 744   return 0;
 745 }
 746
 747 /* Mark all indirect constants for GC.  */
 748
 749 static void
 750 mark_indirect_pool (arg)
 751      PTR arg ATTRIBUTE_UNUSED;
 752 {
 753   splay_tree_foreach (indirect_pool, mark_indirect_pool_entry, NULL);
 754 }
 755
 756 /* Put X, a SYMBOL_REF, in memory.  Return a SYMBOL_REF to the allocated
 757    memory.  Differs from force_const_mem in that a single pool is used for
 758    the entire unit of translation, and the memory is not guaranteed to be
 759    "near" the function in any interesting sense.  */
 760
 761 static rtx
 762 dw2_force_const_mem (x)
 763      rtx x;
 764 {
 765   splay_tree_node node;
 766   const char *str;
 767   tree decl;
 768
 769   if (! indirect_pool)
 770     {
 771       indirect_pool = splay_tree_new (splay_tree_compare_pointers, NULL, NULL);
 772       ggc_add_root (&indirect_pool, 1, sizeof indirect_pool, mark_indirect_pool);
 773     }
 774
 775   if (GET_CODE (x) != SYMBOL_REF)
 776     abort ();
 777
 778   STRIP_NAME_ENCODING (str, XSTR (x, 0));
 779   node = splay_tree_lookup (indirect_pool, (splay_tree_key) str);
 780   if (node)
 781     decl = (tree) node->value;
 782   else
 783     {
 784       tree id;
 785
 786       if (USE_LINKONCE_INDIRECT)
 787         {
 788           char *ref_name = alloca (strlen (str) + sizeof "DW.ref.");
 789
 790           sprintf (ref_name, "DW.ref.%s", str);
 791           id = get_identifier (ref_name);
 792           decl = build_decl (VAR_DECL, id, ptr_type_node);
 793           DECL_ARTIFICIAL (decl) = 1;
 794           TREE_PUBLIC (decl) = 1;
 795           DECL_INITIAL (decl) = decl;
 796           make_decl_one_only (decl);
 797         }
 798       else
 799         {
 800           extern int const_labelno;
 801           char label[32];
 802
 803           ASM_GENERATE_INTERNAL_LABEL (label, "LC", const_labelno);
 804           ++const_labelno;
 805           id = get_identifier (label);
 806           decl = build_decl (VAR_DECL, id, ptr_type_node);
 807           DECL_ARTIFICIAL (decl) = 1;
 808           TREE_STATIC (decl) = 1;
 809           DECL_INITIAL (decl) = decl;
 810         }
 811
 812       id = maybe_get_identifier (str);
 813       if (id)
 814         TREE_SYMBOL_REFERENCED (id) = 1;
 815
 816       splay_tree_insert (indirect_pool, (splay_tree_key) str,
 817                          (splay_tree_value) decl);
 818     }
 819
 820   return XEXP (DECL_RTL (decl), 0);
 821 }
 822
 823 /* A helper function for dw2_output_indirect_constants called through
 824    splay_tree_foreach.  Emit one queued constant to memory.  */
 825
 826 static int
 827 dw2_output_indirect_constant_1 (node, data)
 828      splay_tree_node node;
 829      void* data ATTRIBUTE_UNUSED;
 830 {
 831   const char *sym;
 832   rtx sym_ref;
 833
 834   sym = (const char *) node->key;
 835   sym_ref = gen_rtx_SYMBOL_REF (Pmode, sym);
 836   if (USE_LINKONCE_INDIRECT)
 837     fprintf (asm_out_file, "\t.hidden DW.ref.%s\n", sym);
 838   assemble_variable ((tree) node->value, 1, 1, 1);
 839   assemble_integer (sym_ref, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
 840
 841   return 0;
 842 }
 843
 844 /* Emit the constants queued through dw2_force_const_mem.  */
 845
 846 void
 847 dw2_output_indirect_constants ()
 848 {
 849   if (indirect_pool)
 850     splay_tree_foreach (indirect_pool, dw2_output_indirect_constant_1, NULL);
 851 }
 852
 853 /* Like dw2_asm_output_addr_rtx, but encode the pointer as directed.  */
 854
 855 void
 856 dw2_asm_output_encoded_addr_rtx VPARAMS ((int encoding,
 857                                           rtx addr,
 858                                           const char *comment, ...))
 859 {
 860   int size;
 861
 862   VA_OPEN (ap, comment);
 863   VA_FIXEDARG (ap, int, encoding);
 864   VA_FIXEDARG (ap, rtx, addr);
 865   VA_FIXEDARG (ap, const char *, comment);
 866
 867   size = size_of_encoded_value (encoding);
 868
 869   if (encoding == DW_EH_PE_aligned)
 870     {
 871       assemble_align (POINTER_SIZE);
 872       assemble_integer (addr, size, POINTER_SIZE, 1);
 873       return;
 874     }
 875
 876   /* NULL is _always_ represented as a plain zero.  */
 877   if (addr == const0_rtx)
 878     assemble_integer (addr, size, BITS_PER_UNIT, 1);
 879   else
 880     {
 881     restart:
 882       /* Allow the target first crack at emitting this.  Some of the
 883          special relocations require special directives instead of
 884          just ".4byte" or whatever.  */
 885 #ifdef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX
 886       ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX (asm_out_file, encoding, size,
 887                                          addr, done);
 888 #endif
 889
 890       /* Indirection is used to get dynamic relocations out of a
 891          read-only section.  */
 892       if (encoding & DW_EH_PE_indirect)
 893         {
 894           /* It is very tempting to use force_const_mem so that we share data
 895              with the normal constant pool.  However, we've already emitted
 896              the constant pool for this function.  Moreover, we'd like to
 897              share these constants across the entire unit of translation,
 898              or better, across the entire application (or DSO).  */
 899           addr = dw2_force_const_mem (addr);
 900           encoding &= ~DW_EH_PE_indirect;
 901           goto restart;
 902         }
 903
 904       switch (encoding & 0xF0)
 905         {
 906         case DW_EH_PE_absptr:
 907 #ifdef UNALIGNED_INT_ASM_OP
 908           fputs (unaligned_integer_asm_op (size), asm_out_file);
 909           output_addr_const (asm_out_file, addr);
 910 #else
 911           assemble_integer (addr, size, BITS_PER_UNIT, 1);
 912 #endif
 913           break;
 914
 915         case DW_EH_PE_pcrel:
 916           if (GET_CODE (addr) != SYMBOL_REF)
 917             abort ();
 918 #ifdef ASM_OUTPUT_DWARF_PCREL
 919           ASM_OUTPUT_DWARF_PCREL (asm_out_file, size, XSTR (addr, 0));
 920 #else
 921 #ifdef UNALIGNED_INT_ASM_OP
 922           fputs (unaligned_integer_asm_op (size), asm_out_file);
 923           assemble_name (asm_out_file, XSTR (addr, 0));
 924           fputc ('-', asm_out_file);
 925           fputc ('.', asm_out_file);
 926 #else
 927           abort ();
 928 #endif
 929 #endif
 930           break;
 931
 932         default:
 933           /* Other encodings should have been handled by
 934              ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX.  */
 935           abort ();
 936         }
 937
 938 #ifdef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX
 939     done:;
 940 #endif
 941     }
 942
 943   if (flag_debug_asm && comment)
 944     {
 945       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 946       vfprintf (asm_out_file, comment, ap);
 947     }
 948   fputc ('\n', asm_out_file);
 949
 950   VA_CLOSE (ap);
 951 }