gcc/dwarf2asm.cc

   1 /* Dwarf2 assembler output helper routines.
   2    Copyright (C) 2001-2022 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 3, 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 COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20
  21 #include "config.h"
  22 #include "system.h"
  23 #include "coretypes.h"
  24 #include "target.h"
  25 #include "rtl.h"
  26 #include "tree.h"
  27 #include "memmodel.h"
  28 #include "tm_p.h"
  29 #include "stringpool.h"
  30 #include "varasm.h"
  31 #include "output.h"
  32 #include "dwarf2asm.h"
  33 #include "dwarf2.h"
  34 #include "function.h"
  35 #include "emit-rtl.h"
  36 #include "fold-const.h"
  37
  38 #ifndef XCOFF_DEBUGGING_INFO
  39 #define XCOFF_DEBUGGING_INFO 0
  40 #endif
  41
  42 \f
  43 /* Output an unaligned integer with the given value and size.  Prefer not
  44    to print a newline, since the caller may want to add a comment.  */
  45
  46 void
  47 dw2_assemble_integer (int size, rtx x)
  48 {
  49   if (size == 2 * (int) DWARF2_ADDR_SIZE && !CONST_SCALAR_INT_P (x))
  50     {
  51       /* On 32-bit targets with -gdwarf64, DImode values with
  52          relocations usually result in assembler errors.  Assume
  53          all such values are positive and emit the relocation only
  54          in the least significant half.  */
  55       const char *op = integer_asm_op (DWARF2_ADDR_SIZE, FALSE);
  56       if (BYTES_BIG_ENDIAN)
  57         {
  58           if (op)
  59             {
  60               fputs (op, asm_out_file);
  61               fprint_whex (asm_out_file, 0);
  62               fputs (", ", asm_out_file);
  63               output_addr_const (asm_out_file, x);
  64             }
  65           else
  66             {
  67               assemble_integer (const0_rtx, DWARF2_ADDR_SIZE,
  68                                 BITS_PER_UNIT, 1);
  69               putc ('\n', asm_out_file);
  70               assemble_integer (x, DWARF2_ADDR_SIZE,
  71                                 BITS_PER_UNIT, 1);
  72             }
  73         }
  74       else
  75         {
  76           if (op)
  77             {
  78               fputs (op, asm_out_file);
  79               output_addr_const (asm_out_file, x);
  80               fputs (", ", asm_out_file);
  81               fprint_whex (asm_out_file, 0);
  82             }
  83           else
  84             {
  85               assemble_integer (x, DWARF2_ADDR_SIZE,
  86                                 BITS_PER_UNIT, 1);
  87               putc ('\n', asm_out_file);
  88               assemble_integer (const0_rtx, DWARF2_ADDR_SIZE,
  89                                 BITS_PER_UNIT, 1);
  90             }
  91         }
  92       return;
  93     }
  94
  95   const char *op = integer_asm_op (size, FALSE);
  96
  97   if (op)
  98     {
  99       fputs (op, asm_out_file);
 100       if (CONST_INT_P (x))
 101         fprint_whex (asm_out_file, (unsigned HOST_WIDE_INT) INTVAL (x));
 102       else
 103         output_addr_const (asm_out_file, x);
 104     }
 105   else
 106     assemble_integer (x, size, BITS_PER_UNIT, 1);
 107 }
 108
 109
 110 /* Output a value of a given size in target byte order.  */
 111
 112 void
 113 dw2_asm_output_data_raw (int size, unsigned HOST_WIDE_INT value)
 114 {
 115   unsigned char bytes[8];
 116   int i;
 117
 118   for (i = 0; i < 8; ++i)
 119     {
 120       bytes[i] = value & 0xff;
 121       value >>= 8;
 122     }
 123
 124   if (BYTES_BIG_ENDIAN)
 125     {
 126       for (i = size - 1; i > 0; --i)
 127         fprintf (asm_out_file, "%#x,", bytes[i]);
 128       fprintf (asm_out_file, "%#x", bytes[0]);
 129     }
 130   else
 131     {
 132       for (i = 0; i < size - 1; ++i)
 133         fprintf (asm_out_file, "%#x,", bytes[i]);
 134       fprintf (asm_out_file, "%#x", bytes[i]);
 135     }
 136 }
 137
 138 /* Output an immediate constant in a given SIZE in bytes.  */
 139
 140 void
 141 dw2_asm_output_data (int size, unsigned HOST_WIDE_INT value,
 142                      const char *comment, ...)
 143 {
 144   va_list ap;
 145   const char *op = integer_asm_op (size, FALSE);
 146
 147   va_start (ap, comment);
 148
 149   if (size * 8 < HOST_BITS_PER_WIDE_INT)
 150     value &= ~(HOST_WIDE_INT_M1U << (size * 8));
 151
 152   if (op)
 153     {
 154       fputs (op, asm_out_file);
 155       fprint_whex (asm_out_file, value);
 156     }
 157   else
 158     assemble_integer (GEN_INT (value), size, BITS_PER_UNIT, 1);
 159
 160   if (flag_debug_asm && comment)
 161     {
 162       fputs ("\t" ASM_COMMENT_START " ", asm_out_file);
 163       vfprintf (asm_out_file, comment, ap);
 164     }
 165   putc ('\n', asm_out_file);
 166
 167   va_end (ap);
 168 }
 169
 170 /* Output the difference between two symbols in a given size.  */
 171 /* ??? There appear to be assemblers that do not like such
 172    subtraction, but do support ASM_SET_OP.  It's unfortunately
 173    impossible to do here, since the ASM_SET_OP for the difference
 174    symbol must appear after both symbols are defined.  */
 175
 176 void
 177 dw2_asm_output_delta (int size, const char *lab1, const char *lab2,
 178                       const char *comment, ...)
 179 {
 180   va_list ap;
 181
 182   va_start (ap, comment);
 183
 184 #ifdef ASM_OUTPUT_DWARF_DELTA
 185   ASM_OUTPUT_DWARF_DELTA (asm_out_file, size, lab1, lab2);
 186 #else
 187   dw2_assemble_integer (size,
 188                         gen_rtx_MINUS (Pmode,
 189                                        gen_rtx_SYMBOL_REF (Pmode, lab1),
 190                                        gen_rtx_SYMBOL_REF (Pmode, lab2)));
 191 #endif
 192   if (flag_debug_asm && comment)
 193     {
 194       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 195       vfprintf (asm_out_file, comment, ap);
 196     }
 197   fputc ('\n', asm_out_file);
 198
 199   va_end (ap);
 200 }
 201
 202 #ifdef ASM_OUTPUT_DWARF_VMS_DELTA
 203 /* Output the difference between two symbols in instruction units
 204    in a given size.  */
 205
 206 void
 207 dw2_asm_output_vms_delta (int size ATTRIBUTE_UNUSED,
 208                           const char *lab1, const char *lab2,
 209                           const char *comment, ...)
 210 {
 211   va_list ap;
 212
 213   va_start (ap, comment);
 214
 215   ASM_OUTPUT_DWARF_VMS_DELTA (asm_out_file, size, lab1, lab2);
 216   if (flag_debug_asm && comment)
 217     {
 218       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 219       vfprintf (asm_out_file, comment, ap);
 220     }
 221   fputc ('\n', asm_out_file);
 222
 223   va_end (ap);
 224 }
 225 #endif
 226
 227 /* Output a section-relative reference to a LABEL, which was placed in
 228    BASE.  In general this can only be done for debugging symbols.
 229    E.g. on most targets with the GNU linker, this is accomplished with
 230    a direct reference and the knowledge that the debugging section
 231    will be placed at VMA 0.  Some targets have special relocations for
 232    this that we must use.  */
 233
 234 void
 235 dw2_asm_output_offset (int size, const char *label,
 236                        section *base ATTRIBUTE_UNUSED,
 237                        const char *comment, ...)
 238 {
 239   va_list ap;
 240
 241   va_start (ap, comment);
 242
 243 #ifdef ASM_OUTPUT_DWARF_OFFSET
 244   ASM_OUTPUT_DWARF_OFFSET (asm_out_file, size, label, 0, base);
 245 #else
 246   dw2_assemble_integer (size, gen_rtx_SYMBOL_REF (Pmode, label));
 247 #endif
 248
 249   if (flag_debug_asm && comment)
 250     {
 251       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 252       vfprintf (asm_out_file, comment, ap);
 253     }
 254   fputc ('\n', asm_out_file);
 255
 256   va_end (ap);
 257 }
 258
 259 void
 260 dw2_asm_output_offset (int size, const char *label, HOST_WIDE_INT offset,
 261                        section *base ATTRIBUTE_UNUSED,
 262                        const char *comment, ...)
 263 {
 264   va_list ap;
 265
 266   va_start (ap, comment);
 267
 268 #ifdef ASM_OUTPUT_DWARF_OFFSET
 269   ASM_OUTPUT_DWARF_OFFSET (asm_out_file, size, label, offset, base);
 270 #else
 271   dw2_assemble_integer (size, gen_rtx_PLUS (Pmode,
 272                                             gen_rtx_SYMBOL_REF (Pmode, label),
 273                                             gen_int_mode (offset, Pmode)));
 274 #endif
 275
 276   if (flag_debug_asm && comment)
 277     {
 278       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 279       vfprintf (asm_out_file, comment, ap);
 280     }
 281   fputc ('\n', asm_out_file);
 282
 283   va_end (ap);
 284 }
 285
 286 #if 0
 287
 288 /* Output a self-relative reference to a label, possibly in a
 289    different section or object file.  */
 290
 291 void
 292 dw2_asm_output_pcrel (int size ATTRIBUTE_UNUSED,
 293                       const char *label ATTRIBUTE_UNUSED,
 294                       const char *comment, ...)
 295 {
 296   va_list ap;
 297
 298   va_start (ap, comment);
 299
 300 #ifdef ASM_OUTPUT_DWARF_PCREL
 301   ASM_OUTPUT_DWARF_PCREL (asm_out_file, size, label);
 302 #else
 303   dw2_assemble_integer (size,
 304                         gen_rtx_MINUS (Pmode,
 305                                        gen_rtx_SYMBOL_REF (Pmode, label),
 306                                        pc_rtx));
 307 #endif
 308
 309   if (flag_debug_asm && comment)
 310     {
 311       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 312       vfprintf (asm_out_file, comment, ap);
 313     }
 314   fputc ('\n', asm_out_file);
 315
 316   va_end (ap);
 317 }
 318 #endif /* 0 */
 319
 320 /* Output an absolute reference to a label.  */
 321
 322 void
 323 dw2_asm_output_addr (int size, const char *label,
 324                      const char *comment, ...)
 325 {
 326   va_list ap;
 327
 328   va_start (ap, comment);
 329
 330   dw2_assemble_integer (size, gen_rtx_SYMBOL_REF (Pmode, label));
 331
 332   if (flag_debug_asm && comment)
 333     {
 334       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 335       vfprintf (asm_out_file, comment, ap);
 336     }
 337   fputc ('\n', asm_out_file);
 338
 339   va_end (ap);
 340 }
 341
 342 /* Similar, but use an RTX expression instead of a text label.  */
 343
 344 void
 345 dw2_asm_output_addr_rtx (int size, rtx addr,
 346                          const char *comment, ...)
 347 {
 348   va_list ap;
 349
 350   va_start (ap, comment);
 351
 352   dw2_assemble_integer (size, addr);
 353
 354   if (flag_debug_asm && comment)
 355     {
 356       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 357       vfprintf (asm_out_file, comment, ap);
 358     }
 359   fputc ('\n', asm_out_file);
 360
 361   va_end (ap);
 362 }
 363
 364 /* Output the first ORIG_LEN characters of STR as a string.
 365    If ORIG_LEN is equal to -1, ignore this parameter and output
 366    the entire STR instead.
 367    If COMMENT is not NULL and comments in the debug information
 368    have been requested by the user, append the given COMMENT
 369    to the generated output.  */
 370
 371 void
 372 dw2_asm_output_nstring (const char *str, size_t orig_len,
 373                         const char *comment, ...)
 374 {
 375   size_t i, len;
 376   va_list ap;
 377
 378   va_start (ap, comment);
 379
 380   len = orig_len;
 381
 382   if (len == (size_t) -1)
 383     len = strlen (str);
 384
 385   if (flag_debug_asm && comment)
 386     {
 387       if (XCOFF_DEBUGGING_INFO)
 388         fputs ("\t.byte \"", asm_out_file);
 389       else
 390         fputs ("\t.ascii \"", asm_out_file);
 391
 392       for (i = 0; i < len; i++)
 393         {
 394           int c = str[i];
 395           if (c == '\"')
 396             fputc (XCOFF_DEBUGGING_INFO ? '\"' : '\\', asm_out_file);
 397           else if (c == '\\')
 398             fputc ('\\', asm_out_file);
 399           if (ISPRINT (c))
 400             fputc (c, asm_out_file);
 401           else
 402             fprintf (asm_out_file, "\\%o", c);
 403         }
 404       fprintf (asm_out_file, "\\0\"\t%s ", ASM_COMMENT_START);
 405       vfprintf (asm_out_file, comment, ap);
 406       fputc ('\n', asm_out_file);
 407     }
 408   else
 409     {
 410       /* If an explicit length was given, we can't assume there
 411          is a null termination in the string buffer.  */
 412       if (orig_len == (size_t) -1)
 413         len += 1;
 414       ASM_OUTPUT_ASCII (asm_out_file, str, len);
 415       if (orig_len != (size_t) -1)
 416         assemble_integer (const0_rtx, 1, BITS_PER_UNIT, 1);
 417     }
 418
 419   va_end (ap);
 420 }
 421 \f
 422
 423 /* Return the size of an unsigned LEB128 quantity.  */
 424
 425 int
 426 size_of_uleb128 (unsigned HOST_WIDE_INT value)
 427 {
 428   int size = 0;
 429
 430   do
 431     {
 432       value >>= 7;
 433       size += 1;
 434     }
 435   while (value != 0);
 436
 437   return size;
 438 }
 439
 440 /* Return the size of a signed LEB128 quantity.  */
 441
 442 int
 443 size_of_sleb128 (HOST_WIDE_INT value)
 444 {
 445   int size = 0, byte;
 446
 447   do
 448     {
 449       byte = (value & 0x7f);
 450       value >>= 7;
 451       size += 1;
 452     }
 453   while (!((value == 0 && (byte & 0x40) == 0)
 454            || (value == -1 && (byte & 0x40) != 0)));
 455
 456   return size;
 457 }
 458
 459 /* Given an encoding, return the number of bytes the format occupies.
 460    This is only defined for fixed-size encodings, and so does not
 461    include leb128.  */
 462
 463 int
 464 size_of_encoded_value (int encoding)
 465 {
 466   if (encoding == DW_EH_PE_omit)
 467     return 0;
 468
 469   switch (encoding & 0x07)
 470     {
 471     case DW_EH_PE_absptr:
 472       return POINTER_SIZE_UNITS;
 473     case DW_EH_PE_udata2:
 474       return 2;
 475     case DW_EH_PE_udata4:
 476       return 4;
 477     case DW_EH_PE_udata8:
 478       return 8;
 479     default:
 480       gcc_unreachable ();
 481     }
 482 }
 483
 484 /* Yield a name for a given pointer encoding.  */
 485
 486 const char *
 487 eh_data_format_name (int format)
 488 {
 489 #if HAVE_DESIGNATED_INITIALIZERS
 490 #define S(p, v)         [p] = v,
 491 #else
 492 #define S(p, v)         case p: return v;
 493 #endif
 494
 495 #if HAVE_DESIGNATED_INITIALIZERS
 496   __extension__ static const char * const format_names[256] = {
 497 #else
 498   switch (format) {
 499 #endif
 500
 501   S(DW_EH_PE_absptr, "absolute")
 502   S(DW_EH_PE_omit, "omit")
 503   S(DW_EH_PE_aligned, "aligned absolute")
 504
 505   S(DW_EH_PE_uleb128, "uleb128")
 506   S(DW_EH_PE_udata2, "udata2")
 507   S(DW_EH_PE_udata4, "udata4")
 508   S(DW_EH_PE_udata8, "udata8")
 509   S(DW_EH_PE_sleb128, "sleb128")
 510   S(DW_EH_PE_sdata2, "sdata2")
 511   S(DW_EH_PE_sdata4, "sdata4")
 512   S(DW_EH_PE_sdata8, "sdata8")
 513
 514   S(DW_EH_PE_absptr | DW_EH_PE_pcrel, "pcrel")
 515   S(DW_EH_PE_uleb128 | DW_EH_PE_pcrel, "pcrel uleb128")
 516   S(DW_EH_PE_udata2 | DW_EH_PE_pcrel, "pcrel udata2")
 517   S(DW_EH_PE_udata4 | DW_EH_PE_pcrel, "pcrel udata4")
 518   S(DW_EH_PE_udata8 | DW_EH_PE_pcrel, "pcrel udata8")
 519   S(DW_EH_PE_sleb128 | DW_EH_PE_pcrel, "pcrel sleb128")
 520   S(DW_EH_PE_sdata2 | DW_EH_PE_pcrel, "pcrel sdata2")
 521   S(DW_EH_PE_sdata4 | DW_EH_PE_pcrel, "pcrel sdata4")
 522   S(DW_EH_PE_sdata8 | DW_EH_PE_pcrel, "pcrel sdata8")
 523
 524   S(DW_EH_PE_absptr | DW_EH_PE_textrel, "textrel")
 525   S(DW_EH_PE_uleb128 | DW_EH_PE_textrel, "textrel uleb128")
 526   S(DW_EH_PE_udata2 | DW_EH_PE_textrel, "textrel udata2")
 527   S(DW_EH_PE_udata4 | DW_EH_PE_textrel, "textrel udata4")
 528   S(DW_EH_PE_udata8 | DW_EH_PE_textrel, "textrel udata8")
 529   S(DW_EH_PE_sleb128 | DW_EH_PE_textrel, "textrel sleb128")
 530   S(DW_EH_PE_sdata2 | DW_EH_PE_textrel, "textrel sdata2")
 531   S(DW_EH_PE_sdata4 | DW_EH_PE_textrel, "textrel sdata4")
 532   S(DW_EH_PE_sdata8 | DW_EH_PE_textrel, "textrel sdata8")
 533
 534   S(DW_EH_PE_absptr | DW_EH_PE_datarel, "datarel")
 535   S(DW_EH_PE_uleb128 | DW_EH_PE_datarel, "datarel uleb128")
 536   S(DW_EH_PE_udata2 | DW_EH_PE_datarel, "datarel udata2")
 537   S(DW_EH_PE_udata4 | DW_EH_PE_datarel, "datarel udata4")
 538   S(DW_EH_PE_udata8 | DW_EH_PE_datarel, "datarel udata8")
 539   S(DW_EH_PE_sleb128 | DW_EH_PE_datarel, "datarel sleb128")
 540   S(DW_EH_PE_sdata2 | DW_EH_PE_datarel, "datarel sdata2")
 541   S(DW_EH_PE_sdata4 | DW_EH_PE_datarel, "datarel sdata4")
 542   S(DW_EH_PE_sdata8 | DW_EH_PE_datarel, "datarel sdata8")
 543
 544   S(DW_EH_PE_absptr | DW_EH_PE_funcrel, "funcrel")
 545   S(DW_EH_PE_uleb128 | DW_EH_PE_funcrel, "funcrel uleb128")
 546   S(DW_EH_PE_udata2 | DW_EH_PE_funcrel, "funcrel udata2")
 547   S(DW_EH_PE_udata4 | DW_EH_PE_funcrel, "funcrel udata4")
 548   S(DW_EH_PE_udata8 | DW_EH_PE_funcrel, "funcrel udata8")
 549   S(DW_EH_PE_sleb128 | DW_EH_PE_funcrel, "funcrel sleb128")
 550   S(DW_EH_PE_sdata2 | DW_EH_PE_funcrel, "funcrel sdata2")
 551   S(DW_EH_PE_sdata4 | DW_EH_PE_funcrel, "funcrel sdata4")
 552   S(DW_EH_PE_sdata8 | DW_EH_PE_funcrel, "funcrel sdata8")
 553
 554   S(DW_EH_PE_indirect | DW_EH_PE_absptr, "indirect absolute")
 555
 556   S(DW_EH_PE_indirect | DW_EH_PE_absptr | DW_EH_PE_pcrel,
 557     "indirect pcrel")
 558   S(DW_EH_PE_indirect | DW_EH_PE_uleb128 | DW_EH_PE_pcrel,
 559     "indirect pcrel uleb128")
 560   S(DW_EH_PE_indirect | DW_EH_PE_udata2 | DW_EH_PE_pcrel,
 561     "indirect pcrel udata2")
 562   S(DW_EH_PE_indirect | DW_EH_PE_udata4 | DW_EH_PE_pcrel,
 563     "indirect pcrel udata4")
 564   S(DW_EH_PE_indirect | DW_EH_PE_udata8 | DW_EH_PE_pcrel,
 565     "indirect pcrel udata8")
 566   S(DW_EH_PE_indirect | DW_EH_PE_sleb128 | DW_EH_PE_pcrel,
 567     "indirect pcrel sleb128")
 568   S(DW_EH_PE_indirect | DW_EH_PE_sdata2 | DW_EH_PE_pcrel,
 569     "indirect pcrel sdata2")
 570   S(DW_EH_PE_indirect | DW_EH_PE_sdata4 | DW_EH_PE_pcrel,
 571     "indirect pcrel sdata4")
 572   S(DW_EH_PE_indirect | DW_EH_PE_sdata8 | DW_EH_PE_pcrel,
 573     "indirect pcrel sdata8")
 574
 575   S(DW_EH_PE_indirect | DW_EH_PE_absptr | DW_EH_PE_textrel,
 576     "indirect textrel")
 577   S(DW_EH_PE_indirect | DW_EH_PE_uleb128 | DW_EH_PE_textrel,
 578     "indirect textrel uleb128")
 579   S(DW_EH_PE_indirect | DW_EH_PE_udata2 | DW_EH_PE_textrel,
 580     "indirect textrel udata2")
 581   S(DW_EH_PE_indirect | DW_EH_PE_udata4 | DW_EH_PE_textrel,
 582     "indirect textrel udata4")
 583   S(DW_EH_PE_indirect | DW_EH_PE_udata8 | DW_EH_PE_textrel,
 584     "indirect textrel udata8")
 585   S(DW_EH_PE_indirect | DW_EH_PE_sleb128 | DW_EH_PE_textrel,
 586     "indirect textrel sleb128")
 587   S(DW_EH_PE_indirect | DW_EH_PE_sdata2 | DW_EH_PE_textrel,
 588     "indirect textrel sdata2")
 589   S(DW_EH_PE_indirect | DW_EH_PE_sdata4 | DW_EH_PE_textrel,
 590     "indirect textrel sdata4")
 591   S(DW_EH_PE_indirect | DW_EH_PE_sdata8 | DW_EH_PE_textrel,
 592     "indirect textrel sdata8")
 593
 594   S(DW_EH_PE_indirect | DW_EH_PE_absptr | DW_EH_PE_datarel,
 595     "indirect datarel")
 596   S(DW_EH_PE_indirect | DW_EH_PE_uleb128 | DW_EH_PE_datarel,
 597     "indirect datarel uleb128")
 598   S(DW_EH_PE_indirect | DW_EH_PE_udata2 | DW_EH_PE_datarel,
 599     "indirect datarel udata2")
 600   S(DW_EH_PE_indirect | DW_EH_PE_udata4 | DW_EH_PE_datarel,
 601     "indirect datarel udata4")
 602   S(DW_EH_PE_indirect | DW_EH_PE_udata8 | DW_EH_PE_datarel,
 603     "indirect datarel udata8")
 604   S(DW_EH_PE_indirect | DW_EH_PE_sleb128 | DW_EH_PE_datarel,
 605     "indirect datarel sleb128")
 606   S(DW_EH_PE_indirect | DW_EH_PE_sdata2 | DW_EH_PE_datarel,
 607     "indirect datarel sdata2")
 608   S(DW_EH_PE_indirect | DW_EH_PE_sdata4 | DW_EH_PE_datarel,
 609     "indirect datarel sdata4")
 610   S(DW_EH_PE_indirect | DW_EH_PE_sdata8 | DW_EH_PE_datarel,
 611     "indirect datarel sdata8")
 612
 613   S(DW_EH_PE_indirect | DW_EH_PE_absptr | DW_EH_PE_funcrel,
 614     "indirect funcrel")
 615   S(DW_EH_PE_indirect | DW_EH_PE_uleb128 | DW_EH_PE_funcrel,
 616     "indirect funcrel uleb128")
 617   S(DW_EH_PE_indirect | DW_EH_PE_udata2 | DW_EH_PE_funcrel,
 618     "indirect funcrel udata2")
 619   S(DW_EH_PE_indirect | DW_EH_PE_udata4 | DW_EH_PE_funcrel,
 620     "indirect funcrel udata4")
 621   S(DW_EH_PE_indirect | DW_EH_PE_udata8 | DW_EH_PE_funcrel,
 622     "indirect funcrel udata8")
 623   S(DW_EH_PE_indirect | DW_EH_PE_sleb128 | DW_EH_PE_funcrel,
 624     "indirect funcrel sleb128")
 625   S(DW_EH_PE_indirect | DW_EH_PE_sdata2 | DW_EH_PE_funcrel,
 626     "indirect funcrel sdata2")
 627   S(DW_EH_PE_indirect | DW_EH_PE_sdata4 | DW_EH_PE_funcrel,
 628     "indirect funcrel sdata4")
 629   S(DW_EH_PE_indirect | DW_EH_PE_sdata8 | DW_EH_PE_funcrel,
 630     "indirect funcrel sdata8")
 631
 632 #if HAVE_DESIGNATED_INITIALIZERS
 633   };
 634
 635   gcc_assert (format >= 0 && format < 0x100 && format_names[format]);
 636
 637   return format_names[format];
 638 #else
 639   }
 640   gcc_unreachable ();
 641 #endif
 642 }
 643
 644 /* Output an unsigned LEB128 quantity, but only the byte values.  */
 645
 646 void
 647 dw2_asm_output_data_uleb128_raw (unsigned HOST_WIDE_INT value)
 648 {
 649   while (1)
 650     {
 651       int byte = (value & 0x7f);
 652       value >>= 7;
 653       if (value != 0)
 654         /* More bytes to follow.  */
 655         byte |= 0x80;
 656
 657       fprintf (asm_out_file, "%#x", byte);
 658       if (value == 0)
 659         break;
 660       fputc (',', asm_out_file);
 661     }
 662 }
 663
 664 /* Output an unsigned LEB128 quantity.  */
 665
 666 void
 667 dw2_asm_output_data_uleb128 (unsigned HOST_WIDE_INT value,
 668                              const char *comment, ...)
 669 {
 670   va_list ap;
 671
 672   va_start (ap, comment);
 673
 674   if (HAVE_AS_LEB128)
 675     {
 676       fputs ("\t.uleb128 ", asm_out_file);
 677       fprint_whex (asm_out_file, value);
 678
 679       if (flag_debug_asm && comment)
 680         {
 681           fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 682           vfprintf (asm_out_file, comment, ap);
 683         }
 684     }
 685   else
 686     {
 687       unsigned HOST_WIDE_INT work = value;
 688       const char *byte_op = targetm.asm_out.byte_op;
 689
 690       if (byte_op)
 691         fputs (byte_op, asm_out_file);
 692       do
 693         {
 694           int byte = (work & 0x7f);
 695           work >>= 7;
 696           if (work != 0)
 697             /* More bytes to follow.  */
 698             byte |= 0x80;
 699
 700           if (byte_op)
 701             {
 702               fprintf (asm_out_file, "%#x", byte);
 703               if (work != 0)
 704                 fputc (',', asm_out_file);
 705             }
 706           else
 707             assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
 708         }
 709       while (work != 0);
 710
 711       if (flag_debug_asm)
 712         {
 713           fprintf (asm_out_file, "\t%s uleb128 " HOST_WIDE_INT_PRINT_HEX,
 714                    ASM_COMMENT_START, value);
 715           if (comment)
 716             {
 717               fputs ("; ", asm_out_file);
 718               vfprintf (asm_out_file, comment, ap);
 719             }
 720         }
 721     }
 722
 723   putc ('\n', asm_out_file);
 724
 725   va_end (ap);
 726 }
 727
 728 /* Output an signed LEB128 quantity, but only the byte values.  */
 729
 730 void
 731 dw2_asm_output_data_sleb128_raw (HOST_WIDE_INT value)
 732 {
 733   int byte, more;
 734
 735   while (1)
 736     {
 737       byte = (value & 0x7f);
 738       value >>= 7;
 739       more = !((value == 0 && (byte & 0x40) == 0)
 740                 || (value == -1 && (byte & 0x40) != 0));
 741       if (more)
 742         byte |= 0x80;
 743
 744       fprintf (asm_out_file, "%#x", byte);
 745       if (!more)
 746         break;
 747       fputc (',', asm_out_file);
 748     }
 749 }
 750
 751 /* Output a signed LEB128 quantity.  */
 752
 753 void
 754 dw2_asm_output_data_sleb128 (HOST_WIDE_INT value,
 755                              const char *comment, ...)
 756 {
 757   va_list ap;
 758
 759   va_start (ap, comment);
 760
 761   if (HAVE_AS_LEB128)
 762     {
 763       fprintf (asm_out_file, "\t.sleb128 " HOST_WIDE_INT_PRINT_DEC, value);
 764
 765       if (flag_debug_asm && comment)
 766         {
 767           fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 768           vfprintf (asm_out_file, comment, ap);
 769         }
 770     }
 771   else
 772     {
 773       HOST_WIDE_INT work = value;
 774       int more, byte;
 775       const char *byte_op = targetm.asm_out.byte_op;
 776
 777       if (byte_op)
 778         fputs (byte_op, asm_out_file);
 779       do
 780         {
 781           byte = (work & 0x7f);
 782           /* arithmetic shift */
 783           work >>= 7;
 784           more = !((work == 0 && (byte & 0x40) == 0)
 785                    || (work == -1 && (byte & 0x40) != 0));
 786           if (more)
 787             byte |= 0x80;
 788
 789           if (byte_op)
 790             {
 791               fprintf (asm_out_file, "%#x", byte);
 792               if (more)
 793                 fputc (',', asm_out_file);
 794             }
 795           else
 796             assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
 797         }
 798       while (more);
 799
 800       if (flag_debug_asm)
 801         {
 802           fprintf (asm_out_file, "\t%s sleb128 " HOST_WIDE_INT_PRINT_DEC,
 803                    ASM_COMMENT_START, value);
 804           if (comment)
 805             {
 806               fputs ("; ", asm_out_file);
 807               vfprintf (asm_out_file, comment, ap);
 808             }
 809         }
 810     }
 811
 812   fputc ('\n', asm_out_file);
 813
 814   va_end (ap);
 815 }
 816
 817 /* Output symbol LAB1 as an unsigned LEB128 quantity.  LAB1 should be
 818    an assembler-computed constant, e.g. a view number, because we
 819    can't have relocations in LEB128 quantities.  */
 820
 821 void
 822 dw2_asm_output_symname_uleb128 (const char *lab1 ATTRIBUTE_UNUSED,
 823                                 const char *comment, ...)
 824 {
 825   va_list ap;
 826
 827   va_start (ap, comment);
 828
 829 #ifdef HAVE_AS_LEB128
 830   fputs ("\t.uleb128 ", asm_out_file);
 831   assemble_name (asm_out_file, lab1);
 832 #else
 833   gcc_unreachable ();
 834 #endif
 835
 836   if (flag_debug_asm && comment)
 837     {
 838       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 839       vfprintf (asm_out_file, comment, ap);
 840     }
 841   fputc ('\n', asm_out_file);
 842
 843   va_end (ap);
 844 }
 845
 846 void
 847 dw2_asm_output_delta_uleb128 (const char *lab1 ATTRIBUTE_UNUSED,
 848                               const char *lab2 ATTRIBUTE_UNUSED,
 849                               const char *comment, ...)
 850 {
 851   va_list ap;
 852
 853   va_start (ap, comment);
 854
 855   gcc_assert (HAVE_AS_LEB128);
 856
 857   fputs ("\t.uleb128 ", asm_out_file);
 858   assemble_name (asm_out_file, lab1);
 859   putc ('-', asm_out_file);
 860   /* dwarf2out.cc might give us a label expression (e.g. .LVL548-1)
 861      as second argument.  If so, make it a subexpression, to make
 862      sure the substraction is done in the right order.  */
 863   if (strchr (lab2, '-') != NULL)
 864     {
 865       putc ('(', asm_out_file);
 866       assemble_name (asm_out_file, lab2);
 867       putc (')', asm_out_file);
 868     }
 869   else
 870     assemble_name (asm_out_file, lab2);
 871
 872   if (flag_debug_asm && comment)
 873     {
 874       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 875       vfprintf (asm_out_file, comment, ap);
 876     }
 877   fputc ('\n', asm_out_file);
 878
 879   va_end (ap);
 880 }
 881
 882 #if 0
 883
 884 void
 885 dw2_asm_output_delta_sleb128 (const char *lab1 ATTRIBUTE_UNUSED,
 886                               const char *lab2 ATTRIBUTE_UNUSED,
 887                               const char *comment, ...)
 888 {
 889   va_list ap;
 890
 891   va_start (ap, comment);
 892
 893   gcc_assert (HAVE_AS_LEB128);
 894
 895   fputs ("\t.sleb128 ", asm_out_file);
 896   assemble_name (asm_out_file, lab1);
 897   putc ('-', asm_out_file);
 898   assemble_name (asm_out_file, lab2);
 899
 900   if (flag_debug_asm && comment)
 901     {
 902       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 903       vfprintf (asm_out_file, comment, ap);
 904     }
 905   fputc ('\n', asm_out_file);
 906
 907   va_end (ap);
 908 }
 909 #endif /* 0 */
 910 \f
 911 static GTY(()) hash_map<const char *, tree> *indirect_pool;
 912
 913 static GTY(()) int dw2_const_labelno;
 914
 915 #if defined(HAVE_GAS_HIDDEN)
 916 # define USE_LINKONCE_INDIRECT (SUPPORTS_ONE_ONLY && !XCOFF_DEBUGGING_INFO)
 917 #else
 918 # define USE_LINKONCE_INDIRECT 0
 919 #endif
 920
 921 /* Compare two std::pair<const char *, tree> by their first element.
 922    Returns <0, 0, or
 923    >0 to indicate whether K1 is less than, equal to, or greater than
 924    K2, respectively.  */
 925
 926 static int
 927 compare_strings (const void *a, const void *b)
 928 {
 929   const char *s1 = ((const std::pair<const char *, tree> *) a)->first;
 930   const char *s2 = ((const std::pair<const char *, tree> *) b)->first;
 931   int ret;
 932
 933   if (s1 == s2)
 934     return 0;
 935
 936   ret = strcmp (s1, s2);
 937
 938   /* The strings are always those from IDENTIFIER_NODEs, and,
 939      therefore, we should never have two copies of the same
 940      string.  */
 941   gcc_assert (ret);
 942
 943   return ret;
 944 }
 945
 946 /* Put X, a SYMBOL_REF, in memory.  Return a SYMBOL_REF to the allocated
 947    memory.  Differs from force_const_mem in that a single pool is used for
 948    the entire unit of translation, and the memory is not guaranteed to be
 949    "near" the function in any interesting sense.  IS_PUBLIC controls whether
 950    the symbol can be shared across the entire application (or DSO).  */
 951
 952 rtx
 953 dw2_force_const_mem (rtx x, bool is_public)
 954 {
 955   const char *key;
 956   tree decl_id;
 957
 958   if (! indirect_pool)
 959     indirect_pool = hash_map<const char *, tree>::create_ggc (64);
 960
 961   gcc_assert (GET_CODE (x) == SYMBOL_REF);
 962
 963   key = XSTR (x, 0);
 964   tree *slot = indirect_pool->get (key);
 965   if (slot)
 966     decl_id = *slot;
 967   else
 968     {
 969       tree id;
 970       const char *str = targetm.strip_name_encoding (key);
 971
 972       if (is_public && USE_LINKONCE_INDIRECT)
 973         {
 974           char *ref_name = XALLOCAVEC (char, strlen (str) + sizeof "DW.ref.");
 975
 976           sprintf (ref_name, "DW.ref.%s", str);
 977           gcc_assert (!maybe_get_identifier (ref_name));
 978           decl_id = get_identifier (ref_name);
 979           TREE_PUBLIC (decl_id) = 1;
 980         }
 981       else
 982         {
 983           char label[32];
 984
 985           ASM_GENERATE_INTERNAL_LABEL (label, "LDFCM", dw2_const_labelno);
 986           ++dw2_const_labelno;
 987           gcc_assert (!maybe_get_identifier (label));
 988           decl_id = get_identifier (label);
 989         }
 990
 991       id = maybe_get_identifier (str);
 992       if (id)
 993         TREE_SYMBOL_REFERENCED (id) = 1;
 994
 995       indirect_pool->put (key, decl_id);
 996     }
 997
 998   return gen_rtx_SYMBOL_REF (Pmode, IDENTIFIER_POINTER (decl_id));
 999 }
1000
1001 /* A helper function for dw2_output_indirect_constants.  Emit one queued
1002    constant to memory.  */
1003
1004 static int
1005 dw2_output_indirect_constant_1 (const char *sym, tree id)
1006 {
1007   rtx sym_ref;
1008   tree decl;
1009
1010   decl = build_decl (UNKNOWN_LOCATION, VAR_DECL, id, ptr_type_node);
1011   SET_DECL_ASSEMBLER_NAME (decl, id);
1012   DECL_ARTIFICIAL (decl) = 1;
1013   DECL_IGNORED_P (decl) = 1;
1014   DECL_INITIAL (decl) = build_fold_addr_expr (decl);
1015   TREE_READONLY (decl) = 1;
1016   TREE_STATIC (decl) = 1;
1017
1018   if (TREE_PUBLIC (id))
1019     {
1020       TREE_PUBLIC (decl) = 1;
1021       make_decl_one_only (decl, DECL_ASSEMBLER_NAME (decl));
1022       if (USE_LINKONCE_INDIRECT)
1023         DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
1024     }
1025
1026   sym_ref = gen_rtx_SYMBOL_REF (Pmode, sym);
1027   /* Disable ASan for decl because redzones cause ABI breakage between GCC and
1028      libstdc++ for `.LDFCM*' variables.  See PR 78651 for details.  */
1029   unsigned int save_flag_sanitize = flag_sanitize;
1030   flag_sanitize &= ~(SANITIZE_ADDRESS | SANITIZE_USER_ADDRESS
1031                      | SANITIZE_KERNEL_ADDRESS);
1032   /* And also temporarily disable -fsection-anchors.  These indirect constants
1033      are never referenced from code, so it doesn't make any sense to aggregate
1034      them in blocks.  */
1035   int save_flag_section_anchors = flag_section_anchors;
1036   flag_section_anchors = 0;
1037   assemble_variable (decl, 1, 1, 1);
1038   flag_section_anchors = save_flag_section_anchors;
1039   flag_sanitize = save_flag_sanitize;
1040   assemble_integer (sym_ref, POINTER_SIZE_UNITS, POINTER_SIZE, 1);
1041   /* The following is a hack recognized by use_blocks_for_decl_p to disable
1042      section anchor handling of the decl.  */
1043   DECL_INITIAL (decl) = decl;
1044
1045   return 0;
1046 }
1047
1048 /* Emit the constants queued through dw2_force_const_mem.  */
1049
1050 void
1051 dw2_output_indirect_constants (void)
1052 {
1053   if (!indirect_pool)
1054     return;
1055
1056   auto_vec<std::pair<const char *, tree> > temp (indirect_pool->elements ());
1057   for (hash_map<const char *, tree>::iterator iter = indirect_pool->begin ();
1058        iter != indirect_pool->end (); ++iter)
1059     temp.quick_push (*iter);
1060
1061   temp.qsort (compare_strings);
1062
1063   for (unsigned int i = 0; i < temp.length (); i++)
1064     dw2_output_indirect_constant_1 (temp[i].first, temp[i].second);
1065 }
1066
1067 /* Like dw2_asm_output_addr_rtx, but encode the pointer as directed.
1068    If PUBLIC is set and the encoding is DW_EH_PE_indirect, the indirect
1069    reference is shared across the entire application (or DSO).  */
1070
1071 void
1072 dw2_asm_output_encoded_addr_rtx (int encoding, rtx addr, bool is_public,
1073                                  const char *comment, ...)
1074 {
1075   int size;
1076   va_list ap;
1077
1078   va_start (ap, comment);
1079
1080   size = size_of_encoded_value (encoding);
1081
1082   if (encoding == DW_EH_PE_aligned)
1083     {
1084       assemble_align (POINTER_SIZE);
1085       assemble_integer (addr, size, POINTER_SIZE, 1);
1086       va_end (ap);
1087       return;
1088     }
1089
1090   /* NULL is _always_ represented as a plain zero, as is 1 for Ada's
1091      "all others".  */
1092   if (addr == const0_rtx || addr == const1_rtx)
1093     assemble_integer (addr, size, BITS_PER_UNIT, 1);
1094   else
1095     {
1096     restart:
1097       /* Allow the target first crack at emitting this.  Some of the
1098          special relocations require special directives instead of
1099          just ".4byte" or whatever.  */
1100 #ifdef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX
1101       ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX (asm_out_file, encoding, size,
1102                                          addr, done);
1103 #endif
1104
1105       /* Indirection is used to get dynamic relocations out of a
1106          read-only section.  */
1107       if (encoding & DW_EH_PE_indirect)
1108         {
1109           /* It is very tempting to use force_const_mem so that we share data
1110              with the normal constant pool.  However, we've already emitted
1111              the constant pool for this function.  Moreover, we'd like to
1112              share these constants across the entire unit of translation and
1113              even, if possible, across the entire application (or DSO).  */
1114           addr = dw2_force_const_mem (addr, is_public);
1115           encoding &= ~DW_EH_PE_indirect;
1116           goto restart;
1117         }
1118
1119       switch (encoding & 0xF0)
1120         {
1121         case DW_EH_PE_absptr:
1122           dw2_assemble_integer (size, addr);
1123           break;
1124
1125 #ifdef ASM_OUTPUT_DWARF_DATAREL
1126         case DW_EH_PE_datarel:
1127           gcc_assert (GET_CODE (addr) == SYMBOL_REF);
1128           ASM_OUTPUT_DWARF_DATAREL (asm_out_file, size, XSTR (addr, 0));
1129           break;
1130 #endif
1131
1132         case DW_EH_PE_pcrel:
1133           gcc_assert (GET_CODE (addr) == SYMBOL_REF);
1134 #ifdef ASM_OUTPUT_DWARF_PCREL
1135           ASM_OUTPUT_DWARF_PCREL (asm_out_file, size, XSTR (addr, 0));
1136 #else
1137           dw2_assemble_integer (size, gen_rtx_MINUS (Pmode, addr, pc_rtx));
1138 #endif
1139           break;
1140
1141         default:
1142           /* Other encodings should have been handled by
1143              ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX.  */
1144           gcc_unreachable ();
1145         }
1146
1147 #ifdef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX
1148     done:;
1149 #endif
1150     }
1151
1152   if (flag_debug_asm && comment)
1153     {
1154       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
1155       vfprintf (asm_out_file, comment, ap);
1156     }
1157   fputc ('\n', asm_out_file);
1158
1159   va_end (ap);
1160 }
1161
1162 #include "gt-dwarf2asm.h"