gcc/dwarf2asm.c

   1 /* Dwarf2 assembler output helper routines.
   2    Copyright (C) 2001-2016 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
  37 #ifndef XCOFF_DEBUGGING_INFO
  38 #define XCOFF_DEBUGGING_INFO 0
  39 #endif
  40
  41 \f
  42 /* Output an unaligned integer with the given value and size.  Prefer not
  43    to print a newline, since the caller may want to add a comment.  */
  44
  45 void
  46 dw2_assemble_integer (int size, rtx x)
  47 {
  48   const char *op = integer_asm_op (size, FALSE);
  49
  50   if (op)
  51     {
  52       fputs (op, asm_out_file);
  53       if (CONST_INT_P (x))
  54         fprint_whex (asm_out_file, (unsigned HOST_WIDE_INT) INTVAL (x));
  55       else
  56         output_addr_const (asm_out_file, x);
  57     }
  58   else
  59     assemble_integer (x, size, BITS_PER_UNIT, 1);
  60 }
  61
  62
  63 /* Output a value of a given size in target byte order.  */
  64
  65 void
  66 dw2_asm_output_data_raw (int size, unsigned HOST_WIDE_INT value)
  67 {
  68   unsigned char bytes[8];
  69   int i;
  70
  71   for (i = 0; i < 8; ++i)
  72     {
  73       bytes[i] = value & 0xff;
  74       value >>= 8;
  75     }
  76
  77   if (BYTES_BIG_ENDIAN)
  78     {
  79       for (i = size - 1; i > 0; --i)
  80         fprintf (asm_out_file, "%#x,", bytes[i]);
  81       fprintf (asm_out_file, "%#x", bytes[0]);
  82     }
  83   else
  84     {
  85       for (i = 0; i < size - 1; ++i)
  86         fprintf (asm_out_file, "%#x,", bytes[i]);
  87       fprintf (asm_out_file, "%#x", bytes[i]);
  88     }
  89 }
  90
  91 /* Output an immediate constant in a given SIZE in bytes.  */
  92
  93 void
  94 dw2_asm_output_data (int size, unsigned HOST_WIDE_INT value,
  95                      const char *comment, ...)
  96 {
  97   va_list ap;
  98   const char *op = integer_asm_op (size, FALSE);
  99
 100   va_start (ap, comment);
 101
 102   if (size * 8 < HOST_BITS_PER_WIDE_INT)
 103     value &= ~(HOST_WIDE_INT_M1U << (size * 8));
 104
 105   if (op)
 106     {
 107       fputs (op, asm_out_file);
 108       fprint_whex (asm_out_file, value);
 109     }
 110   else
 111     assemble_integer (GEN_INT (value), size, BITS_PER_UNIT, 1);
 112
 113   if (flag_debug_asm && comment)
 114     {
 115       fputs ("\t" ASM_COMMENT_START " ", asm_out_file);
 116       vfprintf (asm_out_file, comment, ap);
 117     }
 118   putc ('\n', asm_out_file);
 119
 120   va_end (ap);
 121 }
 122
 123 /* Output the difference between two symbols in a given size.  */
 124 /* ??? There appear to be assemblers that do not like such
 125    subtraction, but do support ASM_SET_OP.  It's unfortunately
 126    impossible to do here, since the ASM_SET_OP for the difference
 127    symbol must appear after both symbols are defined.  */
 128
 129 void
 130 dw2_asm_output_delta (int size, const char *lab1, const char *lab2,
 131                       const char *comment, ...)
 132 {
 133   va_list ap;
 134
 135   va_start (ap, comment);
 136
 137 #ifdef ASM_OUTPUT_DWARF_DELTA
 138   ASM_OUTPUT_DWARF_DELTA (asm_out_file, size, lab1, lab2);
 139 #else
 140   dw2_assemble_integer (size,
 141                         gen_rtx_MINUS (Pmode,
 142                                        gen_rtx_SYMBOL_REF (Pmode, lab1),
 143                                        gen_rtx_SYMBOL_REF (Pmode, lab2)));
 144 #endif
 145   if (flag_debug_asm && comment)
 146     {
 147       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 148       vfprintf (asm_out_file, comment, ap);
 149     }
 150   fputc ('\n', asm_out_file);
 151
 152   va_end (ap);
 153 }
 154
 155 #ifdef ASM_OUTPUT_DWARF_VMS_DELTA
 156 /* Output the difference between two symbols in instruction units
 157    in a given size.  */
 158
 159 void
 160 dw2_asm_output_vms_delta (int size ATTRIBUTE_UNUSED,
 161                           const char *lab1, const char *lab2,
 162                           const char *comment, ...)
 163 {
 164   va_list ap;
 165
 166   va_start (ap, comment);
 167
 168   ASM_OUTPUT_DWARF_VMS_DELTA (asm_out_file, size, lab1, lab2);
 169   if (flag_debug_asm && comment)
 170     {
 171       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 172       vfprintf (asm_out_file, comment, ap);
 173     }
 174   fputc ('\n', asm_out_file);
 175
 176   va_end (ap);
 177 }
 178 #endif
 179
 180 /* Output a section-relative reference to a LABEL, which was placed in
 181    BASE.  In general this can only be done for debugging symbols.
 182    E.g. on most targets with the GNU linker, this is accomplished with
 183    a direct reference and the knowledge that the debugging section
 184    will be placed at VMA 0.  Some targets have special relocations for
 185    this that we must use.  */
 186
 187 void
 188 dw2_asm_output_offset (int size, const char *label,
 189                        section *base ATTRIBUTE_UNUSED,
 190                        const char *comment, ...)
 191 {
 192   va_list ap;
 193
 194   va_start (ap, comment);
 195
 196 #ifdef ASM_OUTPUT_DWARF_OFFSET
 197   ASM_OUTPUT_DWARF_OFFSET (asm_out_file, size, label, 0, base);
 198 #else
 199   dw2_assemble_integer (size, gen_rtx_SYMBOL_REF (Pmode, label));
 200 #endif
 201
 202   if (flag_debug_asm && comment)
 203     {
 204       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 205       vfprintf (asm_out_file, comment, ap);
 206     }
 207   fputc ('\n', asm_out_file);
 208
 209   va_end (ap);
 210 }
 211
 212 void
 213 dw2_asm_output_offset (int size, const char *label, HOST_WIDE_INT offset,
 214                        section *base ATTRIBUTE_UNUSED,
 215                        const char *comment, ...)
 216 {
 217   va_list ap;
 218
 219   va_start (ap, comment);
 220
 221 #ifdef ASM_OUTPUT_DWARF_OFFSET
 222   ASM_OUTPUT_DWARF_OFFSET (asm_out_file, size, label, offset, base);
 223 #else
 224   dw2_assemble_integer (size, gen_rtx_PLUS (Pmode,
 225                                             gen_rtx_SYMBOL_REF (Pmode, label),
 226                                             gen_int_mode (offset, Pmode)));
 227 #endif
 228
 229   if (flag_debug_asm && comment)
 230     {
 231       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 232       vfprintf (asm_out_file, comment, ap);
 233     }
 234   fputc ('\n', asm_out_file);
 235
 236   va_end (ap);
 237 }
 238
 239 #if 0
 240
 241 /* Output a self-relative reference to a label, possibly in a
 242    different section or object file.  */
 243
 244 void
 245 dw2_asm_output_pcrel (int size ATTRIBUTE_UNUSED,
 246                       const char *label ATTRIBUTE_UNUSED,
 247                       const char *comment, ...)
 248 {
 249   va_list ap;
 250
 251   va_start (ap, comment);
 252
 253 #ifdef ASM_OUTPUT_DWARF_PCREL
 254   ASM_OUTPUT_DWARF_PCREL (asm_out_file, size, label);
 255 #else
 256   dw2_assemble_integer (size,
 257                         gen_rtx_MINUS (Pmode,
 258                                        gen_rtx_SYMBOL_REF (Pmode, label),
 259                                        pc_rtx));
 260 #endif
 261
 262   if (flag_debug_asm && comment)
 263     {
 264       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 265       vfprintf (asm_out_file, comment, ap);
 266     }
 267   fputc ('\n', asm_out_file);
 268
 269   va_end (ap);
 270 }
 271 #endif /* 0 */
 272
 273 /* Output an absolute reference to a label.  */
 274
 275 void
 276 dw2_asm_output_addr (int size, const char *label,
 277                      const char *comment, ...)
 278 {
 279   va_list ap;
 280
 281   va_start (ap, comment);
 282
 283   dw2_assemble_integer (size, gen_rtx_SYMBOL_REF (Pmode, label));
 284
 285   if (flag_debug_asm && comment)
 286     {
 287       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 288       vfprintf (asm_out_file, comment, ap);
 289     }
 290   fputc ('\n', asm_out_file);
 291
 292   va_end (ap);
 293 }
 294
 295 /* Similar, but use an RTX expression instead of a text label.  */
 296
 297 void
 298 dw2_asm_output_addr_rtx (int size, rtx addr,
 299                          const char *comment, ...)
 300 {
 301   va_list ap;
 302
 303   va_start (ap, comment);
 304
 305   dw2_assemble_integer (size, addr);
 306
 307   if (flag_debug_asm && comment)
 308     {
 309       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 310       vfprintf (asm_out_file, comment, ap);
 311     }
 312   fputc ('\n', asm_out_file);
 313
 314   va_end (ap);
 315 }
 316
 317 /* Output the first ORIG_LEN characters of STR as a string.
 318    If ORIG_LEN is equal to -1, ignore this parameter and output
 319    the entire STR instead.
 320    If COMMENT is not NULL and comments in the debug information
 321    have been requested by the user, append the given COMMENT
 322    to the generated output.  */
 323
 324 void
 325 dw2_asm_output_nstring (const char *str, size_t orig_len,
 326                         const char *comment, ...)
 327 {
 328   size_t i, len;
 329   va_list ap;
 330
 331   va_start (ap, comment);
 332
 333   len = orig_len;
 334
 335   if (len == (size_t) -1)
 336     len = strlen (str);
 337
 338   if (flag_debug_asm && comment)
 339     {
 340       if (XCOFF_DEBUGGING_INFO)
 341         fputs ("\t.byte \"", asm_out_file);
 342       else
 343         fputs ("\t.ascii \"", asm_out_file);
 344
 345       for (i = 0; i < len; i++)
 346         {
 347           int c = str[i];
 348           if (c == '\"' || c == '\\')
 349             fputc ('\\', asm_out_file);
 350           if (ISPRINT (c))
 351             fputc (c, asm_out_file);
 352           else
 353             fprintf (asm_out_file, "\\%o", c);
 354         }
 355       fprintf (asm_out_file, "\\0\"\t%s ", ASM_COMMENT_START);
 356       vfprintf (asm_out_file, comment, ap);
 357       fputc ('\n', asm_out_file);
 358     }
 359   else
 360     {
 361       /* If an explicit length was given, we can't assume there
 362          is a null termination in the string buffer.  */
 363       if (orig_len == (size_t) -1)
 364         len += 1;
 365       ASM_OUTPUT_ASCII (asm_out_file, str, len);
 366       if (orig_len != (size_t) -1)
 367         assemble_integer (const0_rtx, 1, BITS_PER_UNIT, 1);
 368     }
 369
 370   va_end (ap);
 371 }
 372 \f
 373
 374 /* Return the size of an unsigned LEB128 quantity.  */
 375
 376 int
 377 size_of_uleb128 (unsigned HOST_WIDE_INT value)
 378 {
 379   int size = 0;
 380
 381   do
 382     {
 383       value >>= 7;
 384       size += 1;
 385     }
 386   while (value != 0);
 387
 388   return size;
 389 }
 390
 391 /* Return the size of a signed LEB128 quantity.  */
 392
 393 int
 394 size_of_sleb128 (HOST_WIDE_INT value)
 395 {
 396   int size = 0, byte;
 397
 398   do
 399     {
 400       byte = (value & 0x7f);
 401       value >>= 7;
 402       size += 1;
 403     }
 404   while (!((value == 0 && (byte & 0x40) == 0)
 405            || (value == -1 && (byte & 0x40) != 0)));
 406
 407   return size;
 408 }
 409
 410 /* Given an encoding, return the number of bytes the format occupies.
 411    This is only defined for fixed-size encodings, and so does not
 412    include leb128.  */
 413
 414 int
 415 size_of_encoded_value (int encoding)
 416 {
 417   if (encoding == DW_EH_PE_omit)
 418     return 0;
 419
 420   switch (encoding & 0x07)
 421     {
 422     case DW_EH_PE_absptr:
 423       return POINTER_SIZE_UNITS;
 424     case DW_EH_PE_udata2:
 425       return 2;
 426     case DW_EH_PE_udata4:
 427       return 4;
 428     case DW_EH_PE_udata8:
 429       return 8;
 430     default:
 431       gcc_unreachable ();
 432     }
 433 }
 434
 435 /* Yield a name for a given pointer encoding.  */
 436
 437 const char *
 438 eh_data_format_name (int format)
 439 {
 440 #if HAVE_DESIGNATED_INITIALIZERS
 441 #define S(p, v)         [p] = v,
 442 #else
 443 #define S(p, v)         case p: return v;
 444 #endif
 445
 446 #if HAVE_DESIGNATED_INITIALIZERS
 447   __extension__ static const char * const format_names[256] = {
 448 #else
 449   switch (format) {
 450 #endif
 451
 452   S(DW_EH_PE_absptr, "absolute")
 453   S(DW_EH_PE_omit, "omit")
 454   S(DW_EH_PE_aligned, "aligned absolute")
 455
 456   S(DW_EH_PE_uleb128, "uleb128")
 457   S(DW_EH_PE_udata2, "udata2")
 458   S(DW_EH_PE_udata4, "udata4")
 459   S(DW_EH_PE_udata8, "udata8")
 460   S(DW_EH_PE_sleb128, "sleb128")
 461   S(DW_EH_PE_sdata2, "sdata2")
 462   S(DW_EH_PE_sdata4, "sdata4")
 463   S(DW_EH_PE_sdata8, "sdata8")
 464
 465   S(DW_EH_PE_absptr | DW_EH_PE_pcrel, "pcrel")
 466   S(DW_EH_PE_uleb128 | DW_EH_PE_pcrel, "pcrel uleb128")
 467   S(DW_EH_PE_udata2 | DW_EH_PE_pcrel, "pcrel udata2")
 468   S(DW_EH_PE_udata4 | DW_EH_PE_pcrel, "pcrel udata4")
 469   S(DW_EH_PE_udata8 | DW_EH_PE_pcrel, "pcrel udata8")
 470   S(DW_EH_PE_sleb128 | DW_EH_PE_pcrel, "pcrel sleb128")
 471   S(DW_EH_PE_sdata2 | DW_EH_PE_pcrel, "pcrel sdata2")
 472   S(DW_EH_PE_sdata4 | DW_EH_PE_pcrel, "pcrel sdata4")
 473   S(DW_EH_PE_sdata8 | DW_EH_PE_pcrel, "pcrel sdata8")
 474
 475   S(DW_EH_PE_absptr | DW_EH_PE_textrel, "textrel")
 476   S(DW_EH_PE_uleb128 | DW_EH_PE_textrel, "textrel uleb128")
 477   S(DW_EH_PE_udata2 | DW_EH_PE_textrel, "textrel udata2")
 478   S(DW_EH_PE_udata4 | DW_EH_PE_textrel, "textrel udata4")
 479   S(DW_EH_PE_udata8 | DW_EH_PE_textrel, "textrel udata8")
 480   S(DW_EH_PE_sleb128 | DW_EH_PE_textrel, "textrel sleb128")
 481   S(DW_EH_PE_sdata2 | DW_EH_PE_textrel, "textrel sdata2")
 482   S(DW_EH_PE_sdata4 | DW_EH_PE_textrel, "textrel sdata4")
 483   S(DW_EH_PE_sdata8 | DW_EH_PE_textrel, "textrel sdata8")
 484
 485   S(DW_EH_PE_absptr | DW_EH_PE_datarel, "datarel")
 486   S(DW_EH_PE_uleb128 | DW_EH_PE_datarel, "datarel uleb128")
 487   S(DW_EH_PE_udata2 | DW_EH_PE_datarel, "datarel udata2")
 488   S(DW_EH_PE_udata4 | DW_EH_PE_datarel, "datarel udata4")
 489   S(DW_EH_PE_udata8 | DW_EH_PE_datarel, "datarel udata8")
 490   S(DW_EH_PE_sleb128 | DW_EH_PE_datarel, "datarel sleb128")
 491   S(DW_EH_PE_sdata2 | DW_EH_PE_datarel, "datarel sdata2")
 492   S(DW_EH_PE_sdata4 | DW_EH_PE_datarel, "datarel sdata4")
 493   S(DW_EH_PE_sdata8 | DW_EH_PE_datarel, "datarel sdata8")
 494
 495   S(DW_EH_PE_absptr | DW_EH_PE_funcrel, "funcrel")
 496   S(DW_EH_PE_uleb128 | DW_EH_PE_funcrel, "funcrel uleb128")
 497   S(DW_EH_PE_udata2 | DW_EH_PE_funcrel, "funcrel udata2")
 498   S(DW_EH_PE_udata4 | DW_EH_PE_funcrel, "funcrel udata4")
 499   S(DW_EH_PE_udata8 | DW_EH_PE_funcrel, "funcrel udata8")
 500   S(DW_EH_PE_sleb128 | DW_EH_PE_funcrel, "funcrel sleb128")
 501   S(DW_EH_PE_sdata2 | DW_EH_PE_funcrel, "funcrel sdata2")
 502   S(DW_EH_PE_sdata4 | DW_EH_PE_funcrel, "funcrel sdata4")
 503   S(DW_EH_PE_sdata8 | DW_EH_PE_funcrel, "funcrel sdata8")
 504
 505   S(DW_EH_PE_indirect | DW_EH_PE_absptr, "indirect absolute")
 506
 507   S(DW_EH_PE_indirect | DW_EH_PE_absptr | DW_EH_PE_pcrel,
 508     "indirect pcrel")
 509   S(DW_EH_PE_indirect | DW_EH_PE_uleb128 | DW_EH_PE_pcrel,
 510     "indirect pcrel uleb128")
 511   S(DW_EH_PE_indirect | DW_EH_PE_udata2 | DW_EH_PE_pcrel,
 512     "indirect pcrel udata2")
 513   S(DW_EH_PE_indirect | DW_EH_PE_udata4 | DW_EH_PE_pcrel,
 514     "indirect pcrel udata4")
 515   S(DW_EH_PE_indirect | DW_EH_PE_udata8 | DW_EH_PE_pcrel,
 516     "indirect pcrel udata8")
 517   S(DW_EH_PE_indirect | DW_EH_PE_sleb128 | DW_EH_PE_pcrel,
 518     "indirect pcrel sleb128")
 519   S(DW_EH_PE_indirect | DW_EH_PE_sdata2 | DW_EH_PE_pcrel,
 520     "indirect pcrel sdata2")
 521   S(DW_EH_PE_indirect | DW_EH_PE_sdata4 | DW_EH_PE_pcrel,
 522     "indirect pcrel sdata4")
 523   S(DW_EH_PE_indirect | DW_EH_PE_sdata8 | DW_EH_PE_pcrel,
 524     "indirect pcrel sdata8")
 525
 526   S(DW_EH_PE_indirect | DW_EH_PE_absptr | DW_EH_PE_textrel,
 527     "indirect textrel")
 528   S(DW_EH_PE_indirect | DW_EH_PE_uleb128 | DW_EH_PE_textrel,
 529     "indirect textrel uleb128")
 530   S(DW_EH_PE_indirect | DW_EH_PE_udata2 | DW_EH_PE_textrel,
 531     "indirect textrel udata2")
 532   S(DW_EH_PE_indirect | DW_EH_PE_udata4 | DW_EH_PE_textrel,
 533     "indirect textrel udata4")
 534   S(DW_EH_PE_indirect | DW_EH_PE_udata8 | DW_EH_PE_textrel,
 535     "indirect textrel udata8")
 536   S(DW_EH_PE_indirect | DW_EH_PE_sleb128 | DW_EH_PE_textrel,
 537     "indirect textrel sleb128")
 538   S(DW_EH_PE_indirect | DW_EH_PE_sdata2 | DW_EH_PE_textrel,
 539     "indirect textrel sdata2")
 540   S(DW_EH_PE_indirect | DW_EH_PE_sdata4 | DW_EH_PE_textrel,
 541     "indirect textrel sdata4")
 542   S(DW_EH_PE_indirect | DW_EH_PE_sdata8 | DW_EH_PE_textrel,
 543     "indirect textrel sdata8")
 544
 545   S(DW_EH_PE_indirect | DW_EH_PE_absptr | DW_EH_PE_datarel,
 546     "indirect datarel")
 547   S(DW_EH_PE_indirect | DW_EH_PE_uleb128 | DW_EH_PE_datarel,
 548     "indirect datarel uleb128")
 549   S(DW_EH_PE_indirect | DW_EH_PE_udata2 | DW_EH_PE_datarel,
 550     "indirect datarel udata2")
 551   S(DW_EH_PE_indirect | DW_EH_PE_udata4 | DW_EH_PE_datarel,
 552     "indirect datarel udata4")
 553   S(DW_EH_PE_indirect | DW_EH_PE_udata8 | DW_EH_PE_datarel,
 554     "indirect datarel udata8")
 555   S(DW_EH_PE_indirect | DW_EH_PE_sleb128 | DW_EH_PE_datarel,
 556     "indirect datarel sleb128")
 557   S(DW_EH_PE_indirect | DW_EH_PE_sdata2 | DW_EH_PE_datarel,
 558     "indirect datarel sdata2")
 559   S(DW_EH_PE_indirect | DW_EH_PE_sdata4 | DW_EH_PE_datarel,
 560     "indirect datarel sdata4")
 561   S(DW_EH_PE_indirect | DW_EH_PE_sdata8 | DW_EH_PE_datarel,
 562     "indirect datarel sdata8")
 563
 564   S(DW_EH_PE_indirect | DW_EH_PE_absptr | DW_EH_PE_funcrel,
 565     "indirect funcrel")
 566   S(DW_EH_PE_indirect | DW_EH_PE_uleb128 | DW_EH_PE_funcrel,
 567     "indirect funcrel uleb128")
 568   S(DW_EH_PE_indirect | DW_EH_PE_udata2 | DW_EH_PE_funcrel,
 569     "indirect funcrel udata2")
 570   S(DW_EH_PE_indirect | DW_EH_PE_udata4 | DW_EH_PE_funcrel,
 571     "indirect funcrel udata4")
 572   S(DW_EH_PE_indirect | DW_EH_PE_udata8 | DW_EH_PE_funcrel,
 573     "indirect funcrel udata8")
 574   S(DW_EH_PE_indirect | DW_EH_PE_sleb128 | DW_EH_PE_funcrel,
 575     "indirect funcrel sleb128")
 576   S(DW_EH_PE_indirect | DW_EH_PE_sdata2 | DW_EH_PE_funcrel,
 577     "indirect funcrel sdata2")
 578   S(DW_EH_PE_indirect | DW_EH_PE_sdata4 | DW_EH_PE_funcrel,
 579     "indirect funcrel sdata4")
 580   S(DW_EH_PE_indirect | DW_EH_PE_sdata8 | DW_EH_PE_funcrel,
 581     "indirect funcrel sdata8")
 582
 583 #if HAVE_DESIGNATED_INITIALIZERS
 584   };
 585
 586   gcc_assert (format >= 0 && format < 0x100 && format_names[format]);
 587
 588   return format_names[format];
 589 #else
 590   }
 591   gcc_unreachable ();
 592 #endif
 593 }
 594
 595 /* Output an unsigned LEB128 quantity, but only the byte values.  */
 596
 597 void
 598 dw2_asm_output_data_uleb128_raw (unsigned HOST_WIDE_INT value)
 599 {
 600   while (1)
 601     {
 602       int byte = (value & 0x7f);
 603       value >>= 7;
 604       if (value != 0)
 605         /* More bytes to follow.  */
 606         byte |= 0x80;
 607
 608       fprintf (asm_out_file, "%#x", byte);
 609       if (value == 0)
 610         break;
 611       fputc (',', asm_out_file);
 612     }
 613 }
 614
 615 /* Output an unsigned LEB128 quantity.  */
 616
 617 void
 618 dw2_asm_output_data_uleb128 (unsigned HOST_WIDE_INT value,
 619                              const char *comment, ...)
 620 {
 621   va_list ap;
 622
 623   va_start (ap, comment);
 624
 625 #ifdef HAVE_AS_LEB128
 626   fputs ("\t.uleb128 ", asm_out_file);
 627   fprint_whex (asm_out_file, value);
 628
 629   if (flag_debug_asm && comment)
 630     {
 631       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 632       vfprintf (asm_out_file, comment, ap);
 633     }
 634 #else
 635   {
 636     unsigned HOST_WIDE_INT work = value;
 637     const char *byte_op = targetm.asm_out.byte_op;
 638
 639     if (byte_op)
 640       fputs (byte_op, asm_out_file);
 641     do
 642       {
 643         int byte = (work & 0x7f);
 644         work >>= 7;
 645         if (work != 0)
 646           /* More bytes to follow.  */
 647           byte |= 0x80;
 648
 649         if (byte_op)
 650           {
 651             fprintf (asm_out_file, "%#x", byte);
 652             if (work != 0)
 653               fputc (',', asm_out_file);
 654           }
 655         else
 656           assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
 657       }
 658     while (work != 0);
 659
 660   if (flag_debug_asm)
 661     {
 662       fprintf (asm_out_file, "\t%s uleb128 " HOST_WIDE_INT_PRINT_HEX,
 663                ASM_COMMENT_START, value);
 664       if (comment)
 665         {
 666           fputs ("; ", asm_out_file);
 667           vfprintf (asm_out_file, comment, ap);
 668         }
 669     }
 670   }
 671 #endif
 672   putc ('\n', asm_out_file);
 673
 674   va_end (ap);
 675 }
 676
 677 /* Output an signed LEB128 quantity, but only the byte values.  */
 678
 679 void
 680 dw2_asm_output_data_sleb128_raw (HOST_WIDE_INT value)
 681 {
 682   int byte, more;
 683
 684   while (1)
 685     {
 686       byte = (value & 0x7f);
 687       value >>= 7;
 688       more = !((value == 0 && (byte & 0x40) == 0)
 689                 || (value == -1 && (byte & 0x40) != 0));
 690       if (more)
 691         byte |= 0x80;
 692
 693       fprintf (asm_out_file, "%#x", byte);
 694       if (!more)
 695         break;
 696       fputc (',', asm_out_file);
 697     }
 698 }
 699
 700 /* Output a signed LEB128 quantity.  */
 701
 702 void
 703 dw2_asm_output_data_sleb128 (HOST_WIDE_INT value,
 704                              const char *comment, ...)
 705 {
 706   va_list ap;
 707
 708   va_start (ap, comment);
 709
 710 #ifdef HAVE_AS_LEB128
 711   fprintf (asm_out_file, "\t.sleb128 " HOST_WIDE_INT_PRINT_DEC, value);
 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 #else
 719   {
 720     HOST_WIDE_INT work = value;
 721     int more, byte;
 722     const char *byte_op = targetm.asm_out.byte_op;
 723
 724     if (byte_op)
 725       fputs (byte_op, asm_out_file);
 726     do
 727       {
 728         byte = (work & 0x7f);
 729         /* arithmetic shift */
 730         work >>= 7;
 731         more = !((work == 0 && (byte & 0x40) == 0)
 732                  || (work == -1 && (byte & 0x40) != 0));
 733         if (more)
 734           byte |= 0x80;
 735
 736         if (byte_op)
 737           {
 738             fprintf (asm_out_file, "%#x", byte);
 739             if (more)
 740               fputc (',', asm_out_file);
 741           }
 742         else
 743           assemble_integer (GEN_INT (byte), 1, BITS_PER_UNIT, 1);
 744       }
 745     while (more);
 746
 747   if (flag_debug_asm)
 748     {
 749       fprintf (asm_out_file, "\t%s sleb128 " HOST_WIDE_INT_PRINT_DEC,
 750                ASM_COMMENT_START, value);
 751       if (comment)
 752         {
 753           fputs ("; ", asm_out_file);
 754           vfprintf (asm_out_file, comment, ap);
 755         }
 756     }
 757   }
 758 #endif
 759   fputc ('\n', asm_out_file);
 760
 761   va_end (ap);
 762 }
 763
 764 void
 765 dw2_asm_output_delta_uleb128 (const char *lab1 ATTRIBUTE_UNUSED,
 766                               const char *lab2 ATTRIBUTE_UNUSED,
 767                               const char *comment, ...)
 768 {
 769   va_list ap;
 770
 771   va_start (ap, comment);
 772
 773 #ifdef HAVE_AS_LEB128
 774   fputs ("\t.uleb128 ", asm_out_file);
 775   assemble_name (asm_out_file, lab1);
 776   putc ('-', asm_out_file);
 777   assemble_name (asm_out_file, lab2);
 778 #else
 779   gcc_unreachable ();
 780 #endif
 781
 782   if (flag_debug_asm && comment)
 783     {
 784       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 785       vfprintf (asm_out_file, comment, ap);
 786     }
 787   fputc ('\n', asm_out_file);
 788
 789   va_end (ap);
 790 }
 791
 792 #if 0
 793
 794 void
 795 dw2_asm_output_delta_sleb128 (const char *lab1 ATTRIBUTE_UNUSED,
 796                               const char *lab2 ATTRIBUTE_UNUSED,
 797                               const char *comment, ...)
 798 {
 799   va_list ap;
 800
 801   va_start (ap, comment);
 802
 803 #ifdef HAVE_AS_LEB128
 804   fputs ("\t.sleb128 ", asm_out_file);
 805   assemble_name (asm_out_file, lab1);
 806   putc ('-', asm_out_file);
 807   assemble_name (asm_out_file, lab2);
 808 #else
 809   gcc_unreachable ();
 810 #endif
 811
 812   if (flag_debug_asm && comment)
 813     {
 814       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
 815       vfprintf (asm_out_file, comment, ap);
 816     }
 817   fputc ('\n', asm_out_file);
 818
 819   va_end (ap);
 820 }
 821 #endif /* 0 */
 822 \f
 823 static GTY(()) hash_map<const char *, tree> *indirect_pool;
 824
 825 static GTY(()) int dw2_const_labelno;
 826
 827 #if defined(HAVE_GAS_HIDDEN) && !defined(XCOFF_DEBUGGING_INFO)
 828 # define USE_LINKONCE_INDIRECT (SUPPORTS_ONE_ONLY)
 829 #else
 830 # define USE_LINKONCE_INDIRECT 0
 831 #endif
 832
 833 /* Compare two std::pair<const char *, tree> by their first element.
 834    Returns <0, 0, or
 835    >0 to indicate whether K1 is less than, equal to, or greater than
 836    K2, respectively.  */
 837
 838 static int
 839 compare_strings (const void *a, const void *b)
 840 {
 841   const char *s1 = ((const std::pair<const char *, tree> *) a)->first;
 842   const char *s2 = ((const std::pair<const char *, tree> *) b)->first;
 843   int ret;
 844
 845   if (s1 == s2)
 846     return 0;
 847
 848   ret = strcmp (s1, s2);
 849
 850   /* The strings are always those from IDENTIFIER_NODEs, and,
 851      therefore, we should never have two copies of the same
 852      string.  */
 853   gcc_assert (ret);
 854
 855   return ret;
 856 }
 857
 858 /* Put X, a SYMBOL_REF, in memory.  Return a SYMBOL_REF to the allocated
 859    memory.  Differs from force_const_mem in that a single pool is used for
 860    the entire unit of translation, and the memory is not guaranteed to be
 861    "near" the function in any interesting sense.  IS_PUBLIC controls whether
 862    the symbol can be shared across the entire application (or DSO).  */
 863
 864 rtx
 865 dw2_force_const_mem (rtx x, bool is_public)
 866 {
 867   const char *key;
 868   tree decl_id;
 869
 870   if (! indirect_pool)
 871     indirect_pool = hash_map<const char *, tree>::create_ggc (64);
 872
 873   gcc_assert (GET_CODE (x) == SYMBOL_REF);
 874
 875   key = XSTR (x, 0);
 876   tree *slot = indirect_pool->get (key);
 877   if (slot)
 878     decl_id = *slot;
 879   else
 880     {
 881       tree id;
 882       const char *str = targetm.strip_name_encoding (key);
 883
 884       if (is_public && USE_LINKONCE_INDIRECT)
 885         {
 886           char *ref_name = XALLOCAVEC (char, strlen (str) + sizeof "DW.ref.");
 887
 888           sprintf (ref_name, "DW.ref.%s", str);
 889           gcc_assert (!maybe_get_identifier (ref_name));
 890           decl_id = get_identifier (ref_name);
 891           TREE_PUBLIC (decl_id) = 1;
 892         }
 893       else
 894         {
 895           char label[32];
 896
 897           ASM_GENERATE_INTERNAL_LABEL (label, "LDFCM", dw2_const_labelno);
 898           ++dw2_const_labelno;
 899           gcc_assert (!maybe_get_identifier (label));
 900           decl_id = get_identifier (label);
 901         }
 902
 903       id = maybe_get_identifier (str);
 904       if (id)
 905         TREE_SYMBOL_REFERENCED (id) = 1;
 906
 907       indirect_pool->put (key, decl_id);
 908     }
 909
 910   return gen_rtx_SYMBOL_REF (Pmode, IDENTIFIER_POINTER (decl_id));
 911 }
 912
 913 /* A helper function for dw2_output_indirect_constants.  Emit one queued
 914    constant to memory.  */
 915
 916 static int
 917 dw2_output_indirect_constant_1 (const char *sym, tree id)
 918 {
 919   rtx sym_ref;
 920   tree decl;
 921
 922   decl = build_decl (UNKNOWN_LOCATION, VAR_DECL, id, ptr_type_node);
 923   SET_DECL_ASSEMBLER_NAME (decl, id);
 924   DECL_ARTIFICIAL (decl) = 1;
 925   DECL_IGNORED_P (decl) = 1;
 926   DECL_INITIAL (decl) = decl;
 927   TREE_READONLY (decl) = 1;
 928   TREE_STATIC (decl) = 1;
 929
 930   if (TREE_PUBLIC (id))
 931     {
 932       TREE_PUBLIC (decl) = 1;
 933       make_decl_one_only (decl, DECL_ASSEMBLER_NAME (decl));
 934       if (USE_LINKONCE_INDIRECT)
 935         DECL_VISIBILITY (decl) = VISIBILITY_HIDDEN;
 936     }
 937
 938   sym_ref = gen_rtx_SYMBOL_REF (Pmode, sym);
 939   assemble_variable (decl, 1, 1, 1);
 940   assemble_integer (sym_ref, POINTER_SIZE_UNITS, POINTER_SIZE, 1);
 941
 942   return 0;
 943 }
 944
 945 /* Emit the constants queued through dw2_force_const_mem.  */
 946
 947 void
 948 dw2_output_indirect_constants (void)
 949 {
 950   if (!indirect_pool)
 951     return;
 952
 953   auto_vec<std::pair<const char *, tree> > temp (indirect_pool->elements ());
 954   for (hash_map<const char *, tree>::iterator iter = indirect_pool->begin ();
 955        iter != indirect_pool->end (); ++iter)
 956     temp.quick_push (*iter);
 957
 958   temp.qsort (compare_strings);
 959
 960   for (unsigned int i = 0; i < temp.length (); i++)
 961     dw2_output_indirect_constant_1 (temp[i].first, temp[i].second);
 962 }
 963
 964 /* Like dw2_asm_output_addr_rtx, but encode the pointer as directed.
 965    If PUBLIC is set and the encoding is DW_EH_PE_indirect, the indirect
 966    reference is shared across the entire application (or DSO).  */
 967
 968 void
 969 dw2_asm_output_encoded_addr_rtx (int encoding, rtx addr, bool is_public,
 970                                  const char *comment, ...)
 971 {
 972   int size;
 973   va_list ap;
 974
 975   va_start (ap, comment);
 976
 977   size = size_of_encoded_value (encoding);
 978
 979   if (encoding == DW_EH_PE_aligned)
 980     {
 981       assemble_align (POINTER_SIZE);
 982       assemble_integer (addr, size, POINTER_SIZE, 1);
 983       va_end (ap);
 984       return;
 985     }
 986
 987   /* NULL is _always_ represented as a plain zero, as is 1 for Ada's
 988      "all others".  */
 989   if (addr == const0_rtx || addr == const1_rtx)
 990     assemble_integer (addr, size, BITS_PER_UNIT, 1);
 991   else
 992     {
 993     restart:
 994       /* Allow the target first crack at emitting this.  Some of the
 995          special relocations require special directives instead of
 996          just ".4byte" or whatever.  */
 997 #ifdef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX
 998       ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX (asm_out_file, encoding, size,
 999                                          addr, done);
1000 #endif
1001
1002       /* Indirection is used to get dynamic relocations out of a
1003          read-only section.  */
1004       if (encoding & DW_EH_PE_indirect)
1005         {
1006           /* It is very tempting to use force_const_mem so that we share data
1007              with the normal constant pool.  However, we've already emitted
1008              the constant pool for this function.  Moreover, we'd like to
1009              share these constants across the entire unit of translation and
1010              even, if possible, across the entire application (or DSO).  */
1011           addr = dw2_force_const_mem (addr, is_public);
1012           encoding &= ~DW_EH_PE_indirect;
1013           goto restart;
1014         }
1015
1016       switch (encoding & 0xF0)
1017         {
1018         case DW_EH_PE_absptr:
1019           dw2_assemble_integer (size, addr);
1020           break;
1021
1022 #ifdef ASM_OUTPUT_DWARF_DATAREL
1023         case DW_EH_PE_datarel:
1024           gcc_assert (GET_CODE (addr) == SYMBOL_REF);
1025           ASM_OUTPUT_DWARF_DATAREL (asm_out_file, size, XSTR (addr, 0));
1026           break;
1027 #endif
1028
1029         case DW_EH_PE_pcrel:
1030           gcc_assert (GET_CODE (addr) == SYMBOL_REF);
1031 #ifdef ASM_OUTPUT_DWARF_PCREL
1032           ASM_OUTPUT_DWARF_PCREL (asm_out_file, size, XSTR (addr, 0));
1033 #else
1034           dw2_assemble_integer (size, gen_rtx_MINUS (Pmode, addr, pc_rtx));
1035 #endif
1036           break;
1037
1038         default:
1039           /* Other encodings should have been handled by
1040              ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX.  */
1041           gcc_unreachable ();
1042         }
1043
1044 #ifdef ASM_MAYBE_OUTPUT_ENCODED_ADDR_RTX
1045     done:;
1046 #endif
1047     }
1048
1049   if (flag_debug_asm && comment)
1050     {
1051       fprintf (asm_out_file, "\t%s ", ASM_COMMENT_START);
1052       vfprintf (asm_out_file, comment, ap);
1053     }
1054   fputc ('\n', asm_out_file);
1055
1056   va_end (ap);
1057 }
1058
1059 #include "gt-dwarf2asm.h"