gcc/dwarf2asm.c

   1 /* Dwarf2 assembler output helper routines.
   2    Copyright (C) 2001, 2002, 2003, 2004, 2005 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, 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301, USA.  */
  20
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "tm.h"
  26 #include "flags.h"
  27 #include "tree.h"
  28 #include "rtl.h"
  29 #include "output.h"
  30 #include "target.h"
  31 #include "dwarf2asm.h"
  32 #include "dwarf2.h"
  33 #include "splay-tree.h"
  34 #include "ggc.h"
  35 #include "tm_p.h"
  36
  37
  38 /* How to start an assembler comment.  */
  39 #ifndef ASM_COMMENT_START
  40 #define ASM_COMMENT_START ";#"
  41 #endif
  42
  43 \f
  44 /* Output an unaligned integer with the given value and size.  Prefer not
  45    to print a newline, since the caller may want to add a comment.  */
  46
  47 void
  48 dw2_assemble_integer (int size, rtx x)
  49 {
  50   const char *op = integer_asm_op (size, FALSE);
  51
  52   if (op)
  53     {
  54       fputs (op, asm_out_file);
  55       if (GET_CODE (x) == CONST_INT)
  56         fprintf (asm_out_file, HOST_WIDE_INT_PRINT_HEX, INTVAL (x));
  57       else
  58         output_addr_const (asm_out_file, x);
  59     }
  60   else
  61     assemble_integer (x, size, BITS_PER_UNIT, 1);
  62 }
  63
  64
  65 /* Output an immediate constant in a given size.  */
  66
  67 void
  68 dw2_asm_output_data (int size, unsigned HOST_WIDE_INT value,
  69                      const char *comment, ...)
  70 {
  71   va_list ap;
  72
  73   va_start (ap, comment);
  74
  75   if (size * 8 < HOST_BITS_PER_WIDE_INT)
  76     value &= ~(~(unsigned HOST_WIDE_INT) 0 << (size * 8));
  77
  78   dw2_assemble_integer (size, GEN_INT (value));
  79
  80   if (flag_debug_asm && comment)
  81     {
  82       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
  83       vfprintf (asm_out_file, comment, ap);
  84     }
  85   fputc ('\n', asm_out_file);
  86
  87   va_end (ap);
  88 }
  89
  90 /* Output the difference between two symbols in a given size.  */
  91 /* ??? There appear to be assemblers that do not like such
  92    subtraction, but do support ASM_SET_OP.  It's unfortunately
  93    impossible to do here, since the ASM_SET_OP for the difference
  94    symbol must appear after both symbols are defined.  */
  95
  96 void
  97 dw2_asm_output_delta (int size, const char *lab1, const char *lab2,
  98                       const char *comment, ...)
  99 {
 100   va_list ap;
 101
 102   va_start (ap, comment);
 103
 104 #ifdef ASM_OUTPUT_DWARF_DELTA
 105   ASM_OUTPUT_DWARF_DELTA (asm_out_file, size, lab1, lab2);
 106 #else
 107   dw2_assemble_integer (size,
 108                         gen_rtx_MINUS (Pmode,
 109                                        gen_rtx_SYMBOL_REF (Pmode, lab1),
 110                                        gen_rtx_SYMBOL_REF (Pmode, lab2)));
 111 #endif
 112   if (flag_debug_asm && comment)
 113     {
 114       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 115       vfprintf (asm_out_file, comment, ap);
 116     }
 117   fputc ('\n', asm_out_file);
 118
 119   va_end (ap);
 120 }
 121
 122 /* Output a section-relative reference to a label.  In general this
 123    can only be done for debugging symbols.  E.g. on most targets with
 124    the GNU linker, this is accomplished with a direct reference and
 125    the knowledge that the debugging section will be placed at VMA 0.
 126    Some targets have special relocations for this that we must use.  */
 127
 128 void
 129 dw2_asm_output_offset (int size, const char *label,
 130                        const char *comment, ...)
 131 {
 132   va_list ap;
 133
 134   va_start (ap, comment);
 135
 136 #ifdef ASM_OUTPUT_DWARF_OFFSET
 137   ASM_OUTPUT_DWARF_OFFSET (asm_out_file, size, label);
 138 #else
 139   dw2_assemble_integer (size, gen_rtx_SYMBOL_REF (Pmode, label));
 140 #endif
 141
 142   if (flag_debug_asm && comment)
 143     {
 144       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 145       vfprintf (asm_out_file, comment, ap);
 146     }
 147   fputc ('\n', asm_out_file);
 148
 149   va_end (ap);
 150 }
 151
 152 #if 0
 153
 154 /* Output a self-relative reference to a label, possibly in a
 155    different section or object file.  */
 156
 157 void
 158 dw2_asm_output_pcrel (int size ATTRIBUTE_UNUSED,
 159                       const char *label ATTRIBUTE_UNUSED,
 160                       const char *comment, ...)
 161 {
 162   va_list ap;
 163
 164   va_start (ap, comment);
 165
 166 #ifdef ASM_OUTPUT_DWARF_PCREL
 167   ASM_OUTPUT_DWARF_PCREL (asm_out_file, size, label);
 168 #else
 169   dw2_assemble_integer (size,
 170                         gen_rtx_MINUS (Pmode,
 171                                        gen_rtx_SYMBOL_REF (Pmode, label),
 172                                        pc_rtx));
 173 #endif
 174
 175   if (flag_debug_asm && comment)
 176     {
 177       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 178       vfprintf (asm_out_file, comment, ap);
 179     }
 180   fputc ('\n', asm_out_file);
 181
 182   va_end (ap);
 183 }
 184 #endif /* 0 */
 185
 186 /* Output an absolute reference to a label.  */
 187
 188 void
 189 dw2_asm_output_addr (int size, const char *label,
 190                      const char *comment, ...)
 191 {
 192   va_list ap;
 193
 194   va_start (ap, comment);
 195
 196   dw2_assemble_integer (size, gen_rtx_SYMBOL_REF (Pmode, label));
 197
 198   if (flag_debug_asm && comment)
 199     {
 200       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 201       vfprintf (asm_out_file, comment, ap);
 202     }
 203   fputc ('\n', asm_out_file);
 204
 205   va_end (ap);
 206 }
 207
 208 /* Similar, but use an RTX expression instead of a text label.  */
 209
 210 void
 211 dw2_asm_output_addr_rtx (int size, rtx addr,
 212                          const char *comment, ...)
 213 {
 214   va_list ap;
 215
 216   va_start (ap, comment);
 217
 218   dw2_assemble_integer (size, addr);
 219
 220   if (flag_debug_asm && comment)
 221     {
 222       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 223       vfprintf (asm_out_file, comment, ap);
 224     }
 225   fputc ('\n', asm_out_file);
 226
 227   va_end (ap);
 228 }
 229
 230 /* Output the first ORIG_LEN characters of STR as a string.
 231    If ORIG_LEN is equal to -1, ignore this parameter and output
 232    the entire STR instead.
 233    If COMMENT is not NULL and comments in the debug information
 234    have been requested by the user, append the given COMMENT
 235    to the generated output.  */
 236
 237 void
 238 dw2_asm_output_nstring (const char *str, size_t orig_len,
 239                         const char *comment, ...)
 240 {
 241   size_t i, len;
 242   va_list ap;
 243
 244   va_start (ap, comment);
 245
 246   len = orig_len;
 247
 248   if (len == (size_t) -1)
 249     len = strlen (str);
 250
 251   if (flag_debug_asm && comment)
 252     {
 253       fputs ("\t.ascii \"", asm_out_file);
 254       for (i = 0; i < len; i++)
 255         {
 256           int c = str[i];
 257           if (c == '\"' || c == '\\')
 258             fputc ('\\', asm_out_file);
 259           if (ISPRINT(c))
 260             fputc (c, asm_out_file);
 261           else
 262             fprintf (asm_out_file, "\\%o", c);
 263         }
 264       fprintf (asm_out_file, "\\0\"\t%s ", ASM_COMMENT_START);
 265       vfprintf (asm_out_file, comment, ap);
 266       fputc ('\n', asm_out_file);
 267     }
 268   else
 269     {
 270       /* If an explicit length was given, we can't assume there
 271          is a null termination in the string buffer.  */
 272       if (orig_len == (size_t) -1)
 273         len += 1;
 274       ASM_OUTPUT_ASCII (asm_out_file, str, len);
 275       if (orig_len != (size_t) -1)
 276         assemble_integer (const0_rtx, 1, BITS_PER_UNIT, 1);
 277     }
 278
 279   va_end (ap);
 280 }
 281 \f
 282
 283 /* Return the size of an unsigned LEB128 quantity.  */
 284
 285 int
 286 size_of_uleb128 (unsigned HOST_WIDE_INT value)
 287 {
 288   int size = 0;
 289
 290   do
 291     {
 292       value >>= 7;
 293       size += 1;
 294     }
 295   while (value != 0);
 296
 297   return size;
 298 }
 299
 300 /* Return the size of a signed LEB128 quantity.  */
 301
 302 int
 303 size_of_sleb128 (HOST_WIDE_INT value)
 304 {
 305   int size = 0, byte;
 306
 307   do
 308     {
 309       byte = (value & 0x7f);
 310       value >>= 7;
 311       size += 1;
 312     }
 313   while (!((value == 0 && (byte & 0x40) == 0)
 314            || (value == -1 && (byte & 0x40) != 0)));
 315
 316   return size;
 317 }
 318
 319 /* Given an encoding, return the number of bytes the format occupies.
 320    This is only defined for fixed-size encodings, and so does not
 321    include leb128.  */
 322
 323 int
 324 size_of_encoded_value (int encoding)
 325 {
 326   if (encoding == DW_EH_PE_omit)
 327     return 0;
 328
 329   switch (encoding & 0x07)
 330     {
 331     case DW_EH_PE_absptr:
 332       return POINTER_SIZE / BITS_PER_UNIT;
 333     case DW_EH_PE_udata2:
 334       return 2;
 335     case DW_EH_PE_udata4:
 336       return 4;
 337     case DW_EH_PE_udata8:
 338       return 8;
 339     default:
 340       gcc_unreachable ();
 341     }
 342 }
 343
 344 /* Yield a name for a given pointer encoding.  */
 345
 346 const char *
 347 eh_data_format_name (int format)
 348 {
 349 #if HAVE_DESIGNATED_INITIALIZERS
 350 #define S(p, v)         [p] = v,
 351 #else
 352 #define S(p, v)         case p: return v;
 353 #endif
 354
 355 #if HAVE_DESIGNATED_INITIALIZERS
 356   __extension__ static const char * const format_names[256] = {
 357 #else
 358   switch (format) {
 359 #endif
 360
 361   S(DW_EH_PE_absptr, "absolute")
 362   S(DW_EH_PE_omit, "omit")
 363   S(DW_EH_PE_aligned, "aligned absolute")
 364
 365   S(DW_EH_PE_uleb128, "uleb128")
 366   S(DW_EH_PE_udata2, "udata2")
 367   S(DW_EH_PE_udata4, "udata4")
 368   S(DW_EH_PE_udata8, "udata8")
 369   S(DW_EH_PE_sleb128, "sleb128")
 370   S(DW_EH_PE_sdata2, "sdata2")
 371   S(DW_EH_PE_sdata4, "sdata4")
 372   S(DW_EH_PE_sdata8, "sdata8")
 373
 374   S(DW_EH_PE_absptr | DW_EH_PE_pcrel, "pcrel")
 375   S(DW_EH_PE_uleb128 | DW_EH_PE_pcrel, "pcrel uleb128")
 376   S(DW_EH_PE_udata2 | DW_EH_PE_pcrel, "pcrel udata2")
 377   S(DW_EH_PE_udata4 | DW_EH_PE_pcrel, "pcrel udata4")
 378   S(DW_EH_PE_udata8 | DW_EH_PE_pcrel, "pcrel udata8")
 379   S(DW_EH_PE_sleb128 | DW_EH_PE_pcrel, "pcrel sleb128")
 380   S(DW_EH_PE_sdata2 | DW_EH_PE_pcrel, "pcrel sdata2")
 381   S(DW_EH_PE_sdata4 | DW_EH_PE_pcrel, "pcrel sdata4")
 382   S(DW_EH_PE_sdata8 | DW_EH_PE_pcrel, "pcrel sdata8")
 383
 384   S(DW_EH_PE_absptr | DW_EH_PE_textrel, "textrel")
 385   S(DW_EH_PE_uleb128 | DW_EH_PE_textrel, "textrel uleb128")
 386   S(DW_EH_PE_udata2 | DW_EH_PE_textrel, "textrel udata2")
 387   S(DW_EH_PE_udata4 | DW_EH_PE_textrel, "textrel udata4")
 388   S(DW_EH_PE_udata8 | DW_EH_PE_textrel, "textrel udata8")
 389   S(DW_EH_PE_sleb128 | DW_EH_PE_textrel, "textrel sleb128")
 390   S(DW_EH_PE_sdata2 | DW_EH_PE_textrel, "textrel sdata2")
 391   S(DW_EH_PE_sdata4 | DW_EH_PE_textrel, "textrel sdata4")
 392   S(DW_EH_PE_sdata8 | DW_EH_PE_textrel, "textrel sdata8")
 393
 394   S(DW_EH_PE_absptr | DW_EH_PE_datarel, "datarel")
 395   S(DW_EH_PE_uleb128 | DW_EH_PE_datarel, "datarel uleb128")
 396   S(DW_EH_PE_udata2 | DW_EH_PE_datarel, "datarel udata2")
 397   S(DW_EH_PE_udata4 | DW_EH_PE_datarel, "datarel udata4")
 398   S(DW_EH_PE_udata8 | DW_EH_PE_datarel, "datarel udata8")
 399   S(DW_EH_PE_sleb128 | DW_EH_PE_datarel, "datarel sleb128")
 400   S(DW_EH_PE_sdata2 | DW_EH_PE_datarel, "datarel sdata2")
 401   S(DW_EH_PE_sdata4 | DW_EH_PE_datarel, "datarel sdata4")
 402   S(DW_EH_PE_sdata8 | DW_EH_PE_datarel, "datarel sdata8")
 403
 404   S(DW_EH_PE_absptr | DW_EH_PE_funcrel, "funcrel")
 405   S(DW_EH_PE_uleb128 | DW_EH_PE_funcrel, "funcrel uleb128")
 406   S(DW_EH_PE_udata2 | DW_EH_PE_funcrel, "funcrel udata2")
 407   S(DW_EH_PE_udata4 | DW_EH_PE_funcrel, "funcrel udata4")
 408   S(DW_EH_PE_udata8 | DW_EH_PE_funcrel, "funcrel udata8")
 409   S(DW_EH_PE_sleb128 | DW_EH_PE_funcrel, "funcrel sleb128")
 410   S(DW_EH_PE_sdata2 | DW_EH_PE_funcrel, "funcrel sdata2")
 411   S(DW_EH_PE_sdata4 | DW_EH_PE_funcrel, "funcrel sdata4")
 412   S(DW_EH_PE_sdata8 | DW_EH_PE_funcrel, "funcrel sdata8")
 413
 414   S(DW_EH_PE_indirect | DW_EH_PE_absptr | DW_EH_PE_pcrel,
 415     "indirect pcrel")
 416   S(DW_EH_PE_indirect | DW_EH_PE_uleb128 | DW_EH_PE_pcrel,
 417     "indirect pcrel uleb128")
 418   S(DW_EH_PE_indirect | DW_EH_PE_udata2 | DW_EH_PE_pcrel,
 419     "indirect pcrel udata2")
 420   S(DW_EH_PE_indirect | DW_EH_PE_udata4 | DW_EH_PE_pcrel,
 421     "indirect pcrel udata4")
 422   S(DW_EH_PE_indirect | DW_EH_PE_udata8 | DW_EH_PE_pcrel,
 423     "indirect pcrel udata8")
 424   S(DW_EH_PE_indirect | DW_EH_PE_sleb128 | DW_EH_PE_pcrel,
 425     "indirect pcrel sleb128")
 426   S(DW_EH_PE_indirect | DW_EH_PE_sdata2 | DW_EH_PE_pcrel,
 427     "indirect pcrel sdata2")
 428   S(DW_EH_PE_indirect | DW_EH_PE_sdata4 | DW_EH_PE_pcrel,
 429     "indirect pcrel sdata4")
 430   S(DW_EH_PE_indirect | DW_EH_PE_sdata8 | DW_EH_PE_pcrel,
 431     "indirect pcrel sdata8")
 432
 433   S(DW_EH_PE_indirect | DW_EH_PE_absptr | DW_EH_PE_textrel,
 434     "indirect textrel")
 435   S(DW_EH_PE_indirect | DW_EH_PE_uleb128 | DW_EH_PE_textrel,
 436     "indirect textrel uleb128")
 437   S(DW_EH_PE_indirect | DW_EH_PE_udata2 | DW_EH_PE_textrel,
 438     "indirect textrel udata2")
 439   S(DW_EH_PE_indirect | DW_EH_PE_udata4 | DW_EH_PE_textrel,
 440     "indirect textrel udata4")
 441   S(DW_EH_PE_indirect | DW_EH_PE_udata8 | DW_EH_PE_textrel,
 442     "indirect textrel udata8")
 443   S(DW_EH_PE_indirect | DW_EH_PE_sleb128 | DW_EH_PE_textrel,
 444     "indirect textrel sleb128")
 445   S(DW_EH_PE_indirect | DW_EH_PE_sdata2 | DW_EH_PE_textrel,
 446     "indirect textrel sdata2")
 447   S(DW_EH_PE_indirect | DW_EH_PE_sdata4 | DW_EH_PE_textrel,
 448     "indirect textrel sdata4")
 449   S(DW_EH_PE_indirect | DW_EH_PE_sdata8 | DW_EH_PE_textrel,
 450     "indirect textrel sdata8")
 451
 452   S(DW_EH_PE_indirect | DW_EH_PE_absptr | DW_EH_PE_datarel,
 453     "indirect datarel")
 454   S(DW_EH_PE_indirect | DW_EH_PE_uleb128 | DW_EH_PE_datarel,
 455     "indirect datarel uleb128")
 456   S(DW_EH_PE_indirect | DW_EH_PE_udata2 | DW_EH_PE_datarel,
 457     "indirect datarel udata2")
 458   S(DW_EH_PE_indirect | DW_EH_PE_udata4 | DW_EH_PE_datarel,
 459     "indirect datarel udata4")
 460   S(DW_EH_PE_indirect | DW_EH_PE_udata8 | DW_EH_PE_datarel,
 461     "indirect datarel udata8")
 462   S(DW_EH_PE_indirect | DW_EH_PE_sleb128 | DW_EH_PE_datarel,
 463     "indirect datarel sleb128")
 464   S(DW_EH_PE_indirect | DW_EH_PE_sdata2 | DW_EH_PE_datarel,
 465     "indirect datarel sdata2")
 466   S(DW_EH_PE_indirect | DW_EH_PE_sdata4 | DW_EH_PE_datarel,
 467     "indirect datarel sdata4")
 468   S(DW_EH_PE_indirect | DW_EH_PE_sdata8 | DW_EH_PE_datarel,
 469     "indirect datarel sdata8")
 470
 471   S(DW_EH_PE_indirect | DW_EH_PE_absptr | DW_EH_PE_funcrel,
 472     "indirect funcrel")
 473   S(DW_EH_PE_indirect | DW_EH_PE_uleb128 | DW_EH_PE_funcrel,
 474     "indirect funcrel uleb128")
 475   S(DW_EH_PE_indirect | DW_EH_PE_udata2 | DW_EH_PE_funcrel,
 476     "indirect funcrel udata2")
 477   S(DW_EH_PE_indirect | DW_EH_PE_udata4 | DW_EH_PE_funcrel,
 478     "indirect funcrel udata4")
 479   S(DW_EH_PE_indirect | DW_EH_PE_udata8 | DW_EH_PE_funcrel,
 480     "indirect funcrel udata8")
 481   S(DW_EH_PE_indirect | DW_EH_PE_sleb128 | DW_EH_PE_funcrel,
 482     "indirect funcrel sleb128")
 483   S(DW_EH_PE_indirect | DW_EH_PE_sdata2 | DW_EH_PE_funcrel,
 484     "indirect funcrel sdata2")
 485   S(DW_EH_PE_indirect | DW_EH_PE_sdata4 | DW_EH_PE_funcrel,
 486     "indirect funcrel sdata4")
 487   S(DW_EH_PE_indirect | DW_EH_PE_sdata8 | DW_EH_PE_funcrel,
 488     "indirect funcrel sdata8")
 489
 490 #if HAVE_DESIGNATED_INITIALIZERS
 491   };
 492
 493   gcc_assert (format >= 0 && format < 0x100 && format_names[format]);
 494
 495   return format_names[format];
 496 #else
 497   }
 498   gcc_unreachable ();
 499 #endif
 500 }
 501
 502 /* Output an unsigned LEB128 quantity.  */
 503
 504 void
 505 dw2_asm_output_data_uleb128 (unsigned HOST_WIDE_INT value,
 506                              const char *comment, ...)
 507 {
 508   va_list ap;
 509
 510   va_start (ap, comment);
 511
 512 #ifdef HAVE_AS_LEB128
 513   fprintf (asm_out_file, "\t.uleb128 " HOST_WIDE_INT_PRINT_HEX , value);
 514
 515   if (flag_debug_asm && comment)
 516     {
 517       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 518       vfprintf (asm_out_file, comment, ap);
 519     }
 520 #else
 521   {
 522     unsigned HOST_WIDE_INT work = value;
 523     const char *byte_op = targetm.asm_out.byte_op;
 524
 525     if (byte_op)
 526       fputs (byte_op, asm_out_file);
 527     do
 528       {
 529         int byte = (work & 0x7f);
 530         work >>= 7;
 531         if (work != 0)
 532           /* More bytes to follow.  */
 533           byte |= 0x80;
 534
 535         if (byte_op)
 536           {
 537             fprintf (asm_out_file, "0x%x", byte);
 538             if (work != 0)
 539               fputc (',', asm_out_file);
 540           }
 541         else
 542           assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
 543       }
 544     while (work != 0);
 545
 546   if (flag_debug_asm)
 547     {
 548       fprintf (asm_out_file, "\t%s uleb128 " HOST_WIDE_INT_PRINT_HEX,
 549                ASM_COMMENT_START, value);
 550       if (comment)
 551         {
 552           fputs ("; ", asm_out_file);
 553           vfprintf (asm_out_file, comment, ap);
 554         }
 555     }
 556   }
 557 #endif
 558   fputc ('\n', asm_out_file);
 559
 560   va_end (ap);
 561 }
 562
 563 /* Output a signed LEB128 quantity.  */
 564
 565 void
 566 dw2_asm_output_data_sleb128 (HOST_WIDE_INT value,
 567                              const char *comment, ...)
 568 {
 569   va_list ap;
 570
 571   va_start (ap, comment);
 572
 573 #ifdef HAVE_AS_LEB128
 574   fprintf (asm_out_file, "\t.sleb128 " HOST_WIDE_INT_PRINT_DEC, value);
 575
 576   if (flag_debug_asm && comment)
 577     {
 578       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 579       vfprintf (asm_out_file, comment, ap);
 580     }
 581 #else
 582   {
 583     HOST_WIDE_INT work = value;
 584     int more, byte;
 585     const char *byte_op = targetm.asm_out.byte_op;
 586
 587     if (byte_op)
 588       fputs (byte_op, asm_out_file);
 589     do
 590       {
 591         byte = (work & 0x7f);
 592         /* arithmetic shift */
 593         work >>= 7;
 594         more = !((work == 0 && (byte & 0x40) == 0)
 595                  || (work == -1 && (byte & 0x40) != 0));
 596         if (more)
 597           byte |= 0x80;
 598
 599         if (byte_op)
 600           {
 601             fprintf (asm_out_file, "0x%x", byte);
 602             if (more)
 603               fputc (',', asm_out_file);
 604           }
 605         else
 606           assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
 607       }
 608     while (more);
 609
 610   if (flag_debug_asm)
 611     {
 612       fprintf (asm_out_file, "\t%s sleb128 " HOST_WIDE_INT_PRINT_DEC,
 613                ASM_COMMENT_START, value);
 614       if (comment)
 615         {
 616           fputs ("; ", asm_out_file);
 617           vfprintf (asm_out_file, comment, ap);
 618         }
 619     }
 620   }
 621 #endif
 622   fputc ('\n', asm_out_file);
 623
 624   va_end (ap);
 625 }
 626
 627 void
 628 dw2_asm_output_delta_uleb128 (const char *lab1 ATTRIBUTE_UNUSED,
 629                               const char *lab2 ATTRIBUTE_UNUSED,
 630                               const char *comment, ...)
 631 {
 632   va_list ap;
 633
 634   va_start (ap, comment);
 635
 636 #ifdef HAVE_AS_LEB128
 637   fputs ("\t.uleb128 ", asm_out_file);
 638   assemble_name (asm_out_file, lab1);
 639   fputc ('-', asm_out_file);
 640   assemble_name (asm_out_file, lab2);
 641 #else
 642   gcc_unreachable ();
 643 #endif
 644
 645   if (flag_debug_asm && comment)
 646     {
 647       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 648       vfprintf (asm_out_file, comment, ap);
 649     }
 650   fputc ('\n', asm_out_file);
 651
 652   va_end (ap);
 653 }
 654
 655 #if 0
 656
 657 void
 658 dw2_asm_output_delta_sleb128 (const char *lab1 ATTRIBUTE_UNUSED,
 659                               const char *lab2 ATTRIBUTE_UNUSED,
 660                               const char *comment, ...)
 661 {
 662   va_list ap;
 663
 664   va_start (ap, comment);
 665
 666 #ifdef HAVE_AS_LEB128
 667   fputs ("\t.sleb128 ", asm_out_file);
 668   assemble_name (asm_out_file, lab1);
 669   fputc ('-', asm_out_file);
 670   assemble_name (asm_out_file, lab2);
 671 #else
 672   gcc_unreachable ();
 673 #endif
 674
 675   if (flag_debug_asm && comment)
 676     {
 677       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 678       vfprintf (asm_out_file, comment, ap);
 679     }
 680   fputc ('\n', asm_out_file);
 681
 682   va_end (ap);
 683 }
 684 #endif /* 0 */
 685 \f
 686 static rtx dw2_force_const_mem (rtx);
 687 static int dw2_output_indirect_constant_1 (splay_tree_node, void *);
 688
 689 static GTY((param1_is (char *), param2_is (tree))) splay_tree indirect_pool;
 690
 691 static GTY(()) int dw2_const_labelno;
 692
 693 #if defined(HAVE_GAS_HIDDEN) && defined(SUPPORTS_ONE_ONLY)
 694 # define USE_LINKONCE_INDIRECT 1
 695 #else
 696 # define USE_LINKONCE_INDIRECT 0
 697 #endif
 698
 699 /* Put X, a SYMBOL_REF, in memory.  Return a SYMBOL_REF to the allocated
 700    memory.  Differs from force_const_mem in that a single pool is used for
 701    the entire unit of translation, and the memory is not guaranteed to be
 702    "near" the function in any interesting sense.  */
 703
 704 static rtx
 705 dw2_force_const_mem (rtx x)
 706 {
 707   splay_tree_node node;
 708   const char *str;
 709   tree decl;
 710
 711   if (! indirect_pool)
 712     indirect_pool = splay_tree_new_ggc (splay_tree_compare_pointers);
 713
 714   gcc_assert (GET_CODE (x) == SYMBOL_REF);
 715
 716   str = targetm.strip_name_encoding (XSTR (x, 0));
 717   node = splay_tree_lookup (indirect_pool, (splay_tree_key) str);
 718   if (node)
 719     decl = (tree) node->value;
 720   else
 721     {
 722       tree id;
 723
 724       if (USE_LINKONCE_INDIRECT)
 725         {
 726           char *ref_name = alloca (strlen (str) + sizeof "DW.ref.");
 727
 728           sprintf (ref_name, "DW.ref.%s", str);
 729           id = get_identifier (ref_name);
 730           decl = build_decl (VAR_DECL, id, ptr_type_node);
 731           DECL_ARTIFICIAL (decl) = 1;
 732           DECL_IGNORED_P (decl) = 1;
 733           TREE_PUBLIC (decl) = 1;
 734           DECL_INITIAL (decl) = decl;
 735           make_decl_one_only (decl);
 736         }
 737       else
 738         {
 739           char label[32];
 740
 741           ASM_GENERATE_INTERNAL_LABEL (label, "LDFCM", dw2_const_labelno);
 742           ++dw2_const_labelno;
 743           id = get_identifier (label);
 744           decl = build_decl (VAR_DECL, id, ptr_type_node);
 745           DECL_ARTIFICIAL (decl) = 1;
 746           DECL_IGNORED_P (decl) = 1;
 747           TREE_STATIC (decl) = 1;
 748           DECL_INITIAL (decl) = decl;
 749         }
 750
 751       id = maybe_get_identifier (str);
 752       if (id)
 753         TREE_SYMBOL_REFERENCED (id) = 1;
 754
 755       splay_tree_insert (indirect_pool, (splay_tree_key) str,
 756                          (splay_tree_value) decl);
 757     }
 758
 759   return XEXP (DECL_RTL (decl), 0);
 760 }
 761
 762 /* A helper function for dw2_output_indirect_constants called through
 763    splay_tree_foreach.  Emit one queued constant to memory.  */
 764
 765 static int
 766 dw2_output_indirect_constant_1 (splay_tree_node node,
 767                                 void *data ATTRIBUTE_UNUSED)
 768 {
 769   const char *sym;
 770   rtx sym_ref;
 771
 772   sym = (const char *) node->key;
 773   sym_ref = gen_rtx_SYMBOL_REF (Pmode, sym);
 774   if (USE_LINKONCE_INDIRECT)
 775     fprintf (asm_out_file, "\t.hidden %sDW.ref.%s\n", user_label_prefix, sym);
 776   assemble_variable ((tree) node->value, 1, 1, 1);
 777   assemble_integer (sym_ref, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1);
 778
 779   return 0;
 780 }
 781
 782 /* Emit the constants queued through dw2_force_const_mem.  */
 783
 784 void
 785 dw2_output_indirect_constants (void)
 786 {
 787   if (indirect_pool)
 788     splay_tree_foreach (indirect_pool, dw2_output_indirect_constant_1, NULL);
 789 }
 790
 791 /* Like dw2_asm_output_addr_rtx, but encode the pointer as directed.  */
 792
 793 void
 794 dw2_asm_output_encoded_addr_rtx (int encoding, rtx addr,
 795                                  const char *comment, ...)
 796 {
 797   int size;
 798   va_list ap;
 799
 800   va_start (ap, comment);
 801
 802   size = size_of_encoded_value (encoding);
 803
 804   if (encoding == DW_EH_PE_aligned)
 805     {
 806       assemble_align (POINTER_SIZE);
 807       assemble_integer (addr, size, POINTER_SIZE, 1);
 808       return;
 809     }
 810
 811   /* NULL is _always_ represented as a plain zero, as is 1 for Ada's
 812      "all others".  */
 813   if (addr == const0_rtx || addr == const1_rtx)
 814     assemble_integer (addr, size, BITS_PER_UNIT, 1);
 815   else
 816     {
 817     restart:
 818       /* Allow the target first crack at emitting this.  Some of the
 819          special relocations require special directives instead of
 820          just ".4byte" or whatever.  */
 821 #ifdef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX
 822       ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX (asm_out_file, encoding, size,
 823                                          addr, done);
 824 #endif
 825
 826       /* Indirection is used to get dynamic relocations out of a
 827          read-only section.  */
 828       if (encoding & DW_EH_PE_indirect)
 829         {
 830           /* It is very tempting to use force_const_mem so that we share data
 831              with the normal constant pool.  However, we've already emitted
 832              the constant pool for this function.  Moreover, we'd like to
 833              share these constants across the entire unit of translation,
 834              or better, across the entire application (or DSO).  */
 835           addr = dw2_force_const_mem (addr);
 836           encoding &= ~DW_EH_PE_indirect;
 837           goto restart;
 838         }
 839
 840       switch (encoding & 0xF0)
 841         {
 842         case DW_EH_PE_absptr:
 843           dw2_assemble_integer (size, addr);
 844           break;
 845
 846         case DW_EH_PE_pcrel:
 847           gcc_assert (GET_CODE (addr) == SYMBOL_REF);
 848 #ifdef ASM_OUTPUT_DWARF_PCREL
 849           ASM_OUTPUT_DWARF_PCREL (asm_out_file, size, XSTR (addr, 0));
 850 #else
 851           dw2_assemble_integer (size, gen_rtx_MINUS (Pmode, addr, pc_rtx));
 852 #endif
 853           break;
 854
 855         default:
 856           /* Other encodings should have been handled by
 857              ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX.  */
 858           gcc_unreachable ();
 859         }
 860
 861 #ifdef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX
 862     done:;
 863 #endif
 864     }
 865
 866   if (flag_debug_asm && comment)
 867     {
 868       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 869       vfprintf (asm_out_file, comment, ap);
 870     }
 871   fputc ('\n', asm_out_file);
 872
 873   va_end (ap);
 874 }
 875
 876 #include "gt-dwarf2asm.h"