gcc/xcoffout.c

   1 /* Output xcoff-format symbol table information from GNU compiler.
   2    Copyright (C) 1992 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
  19
  20
  21 /* Output xcoff-format symbol table data.  The main functionality is contained
  22    in dbxout.c.  This file implements the sdbout-like parts of the xcoff
  23    interface.  Many functions are very similar to their counterparts in
  24    sdbout.c.  */
  25
  26 /* Include this first, because it may define MIN and MAX.  */
  27 #include <stdio.h>
  28
  29 #include "config.h"
  30 #include "tree.h"
  31 #include "rtl.h"
  32 #include "flags.h"
  33
  34 #ifdef XCOFF_DEBUGGING_INFO
  35
  36 /* This defines the C_* storage classes.  */
  37 #include <dbxstclass.h>
  38
  39 #include "xcoffout.h"
  40
  41 #if defined (USG) || defined (NO_STAB_H)
  42 #include "gstab.h"
  43 #else
  44 #include <stab.h>
  45
  46 /* This is a GNU extension we need to reference in this file.  */
  47 #ifndef N_CATCH
  48 #define N_CATCH 0x54
  49 #endif
  50 #endif
  51
  52 /* These are GNU extensions we need to reference in this file.  */
  53 #ifndef N_DSLINE
  54 #define N_DSLINE 0x46
  55 #endif
  56 #ifndef N_BSLINE
  57 #define N_BSLINE 0x48
  58 #endif
  59
  60 /* Line number of beginning of current function, minus one.
  61    Negative means not in a function or not using xcoff.  */
  62
  63 int xcoff_begin_function_line = -1;
  64
  65 /* Name of the current include file.  */
  66
  67 char *xcoff_current_include_file;
  68
  69 /* Name of the current function file.  This is the file the `.bf' is
  70    emitted from.  In case a line is emitted from a different file,
  71    (by including that file of course), then the line number will be
  72    absolute.  */
  73
  74 char *xcoff_current_function_file;
  75
  76 /* Names of bss and data sections.  These should be unique names for each
  77    compilation unit.  */
  78
  79 char *xcoff_bss_section_name;
  80 char *xcoff_private_data_section_name;
  81 char *xcoff_read_only_section_name;
  82 \f
  83 /* Macro definitions used below.  */
  84 /* Ensure we don't output a negative line number.  */
  85 #define MAKE_LINE_SAFE(LINE)  \
  86   if (LINE <= xcoff_begin_function_line)        \
  87     LINE = xcoff_begin_function_line + 1        \
  88
  89 #define ASM_OUTPUT_LFB(FILE,LINENUM) \
  90 {                                               \
  91   if (xcoff_begin_function_line == -1)          \
  92     {                                           \
  93       xcoff_begin_function_line = (LINENUM) - 1;\
  94       fprintf (FILE, "\t.bf\t%d\n", (LINENUM)); \
  95     }                                           \
  96   xcoff_current_function_file                   \
  97     = (xcoff_current_include_file               \
  98        ? xcoff_current_include_file : main_input_filename); \
  99 }
 100
 101 #define ASM_OUTPUT_LFE(FILE,LINENUM) \
 102   do {                                          \
 103     int linenum = LINENUM;                              \
 104     MAKE_LINE_SAFE (linenum);                   \
 105     fprintf (FILE, "\t.ef\t%d\n", ABS_OR_RELATIVE_LINENO (linenum)); \
 106     xcoff_begin_function_line = -1;             \
 107   } while (0)
 108
 109 #define ASM_OUTPUT_LBB(FILE,LINENUM,BLOCKNUM) \
 110   do {                                          \
 111     int linenum = LINENUM;                              \
 112     MAKE_LINE_SAFE (linenum);                   \
 113     fprintf (FILE, "\t.bb\t%d\n", ABS_OR_RELATIVE_LINENO (linenum)); \
 114   } while (0)
 115
 116 #define ASM_OUTPUT_LBE(FILE,LINENUM,BLOCKNUM) \
 117   do {                                          \
 118     int linenum = LINENUM;                              \
 119     MAKE_LINE_SAFE (linenum);                   \
 120     fprintf (FILE, "\t.eb\t%d\n", ABS_OR_RELATIVE_LINENO (linenum)); \
 121   } while (0)
 122 \f
 123 /* Support routines for XCOFF debugging info.  */
 124
 125 /* Assign NUMBER as the stabx type number for the type described by NAME.
 126    Search all decls in the list SYMS to find the type NAME.  */
 127
 128 static void
 129 assign_type_number (syms, name, number)
 130      tree syms;
 131      char *name;
 132      int number;
 133 {
 134   tree decl;
 135
 136   for (decl = syms; decl; decl = TREE_CHAIN (decl))
 137     if (!strcmp (IDENTIFIER_POINTER (DECL_NAME (decl)), name))
 138       {
 139         TREE_ASM_WRITTEN (decl) = 1;
 140         TYPE_SYMTAB_ADDRESS (TREE_TYPE (decl)) = number;
 141       }
 142 }
 143
 144 /* Setup gcc primitive types to use the XCOFF built-in type numbers where
 145    possible.  */
 146
 147 void
 148 xcoff_output_standard_types (syms)
 149      tree syms;
 150 {
 151   /* Handle built-in C types here.  */
 152
 153   assign_type_number (syms, "int", -1);
 154   assign_type_number (syms, "char", -2);
 155   assign_type_number (syms, "short int", -3);
 156   assign_type_number (syms, "long int", -4);
 157   assign_type_number (syms, "unsigned char", -5);
 158   assign_type_number (syms, "signed char", -6);
 159   assign_type_number (syms, "short unsigned int", -7);
 160   assign_type_number (syms, "unsigned int", -8);
 161   /* No such type "unsigned".  */
 162   assign_type_number (syms, "long unsigned int", -10);
 163   assign_type_number (syms, "void", -11);
 164   assign_type_number (syms, "float", -12);
 165   assign_type_number (syms, "double", -13);
 166   assign_type_number (syms, "long double", -14);
 167   /* Pascal and Fortran types run from -15 to -29.  */
 168   /* No such type "wchar".  */
 169
 170   /* "long long int", and "long long unsigned int", are not handled here,
 171      because there are no predefined types that match them.  */
 172
 173   /* ??? Should also handle built-in C++ and Obj-C types.  There perhaps
 174      aren't any that C doesn't already have.  */
 175 }
 176
 177 /* Print an error message for unrecognized stab codes.  */
 178
 179 #define UNKNOWN_STAB(STR)       \
 180    do { \
 181      fprintf(stderr, "Error, unknown stab %s: : 0x%x\n", STR, stab); \
 182      fflush (stderr);   \
 183    } while (0)
 184
 185 /* Conversion routine from BSD stabs to AIX storage classes.  */
 186
 187 int
 188 stab_to_sclass (stab)
 189      int stab;
 190 {
 191   switch (stab)
 192     {
 193     case N_GSYM:
 194       return C_GSYM;
 195
 196     case N_FNAME:
 197       UNKNOWN_STAB ("N_FNAME");
 198       abort();
 199
 200     case N_FUN:
 201       return C_FUN;
 202
 203     case N_STSYM:
 204     case N_LCSYM:
 205       return C_STSYM;
 206
 207     case N_MAIN:
 208       UNKNOWN_STAB ("N_MAIN");
 209       abort ();
 210
 211     case N_RSYM:
 212       return C_RSYM;
 213
 214     case N_SSYM:
 215       UNKNOWN_STAB ("N_SSYM");
 216       abort ();
 217
 218     case N_RPSYM:
 219       return C_RPSYM;
 220
 221     case N_PSYM:
 222       return C_PSYM;
 223     case N_LSYM:
 224       return C_LSYM;
 225     case N_DECL:
 226       return C_DECL;
 227     case N_ENTRY:
 228       return C_ENTRY;
 229
 230     case N_SO:
 231       UNKNOWN_STAB ("N_SO");
 232       abort ();
 233
 234     case N_SOL:
 235       UNKNOWN_STAB ("N_SOL");
 236       abort ();
 237
 238     case N_SLINE:
 239       UNKNOWN_STAB ("N_SLINE");
 240       abort ();
 241
 242     case N_DSLINE:
 243       UNKNOWN_STAB ("N_DSLINE");
 244       abort ();
 245
 246     case N_BSLINE:
 247       UNKNOWN_STAB ("N_BSLINE");
 248       abort ();
 249 #if 0
 250       /* This has the same value as N_BSLINE.  */
 251     case N_BROWS:
 252       UNKNOWN_STAB ("N_BROWS");
 253       abort ();
 254 #endif
 255
 256     case N_BINCL:
 257       UNKNOWN_STAB ("N_BINCL");
 258       abort ();
 259
 260     case N_EINCL:
 261       UNKNOWN_STAB ("N_EINCL");
 262       abort ();
 263
 264     case N_EXCL:
 265       UNKNOWN_STAB ("N_EXCL");
 266       abort ();
 267
 268     case N_LBRAC:
 269       UNKNOWN_STAB ("N_LBRAC");
 270       abort ();
 271
 272     case N_RBRAC:
 273       UNKNOWN_STAB ("N_RBRAC");
 274       abort ();
 275
 276     case N_BCOMM:
 277       return C_BCOMM;
 278     case N_ECOMM:
 279       return C_ECOMM;
 280     case N_ECOML:
 281       return C_ECOML;
 282
 283     case N_LENG:
 284       UNKNOWN_STAB ("N_LENG");
 285       abort ();
 286
 287     case N_PC:
 288       UNKNOWN_STAB ("N_PC");
 289       abort ();
 290
 291     case N_M2C:
 292       UNKNOWN_STAB ("N_M2C");
 293       abort ();
 294
 295     case N_SCOPE:
 296       UNKNOWN_STAB ("N_SCOPE");
 297       abort ();
 298
 299     case N_CATCH:
 300       UNKNOWN_STAB ("N_CATCH");
 301       abort ();
 302
 303     default:
 304       UNKNOWN_STAB ("default");
 305       abort ();
 306   }
 307 }
 308
 309 /* In XCOFF, we have to have this .bf before the function prologue.
 310    Rely on the value of `dbx_begin_function_line' not to duplicate .bf.  */
 311
 312 void
 313 xcoffout_output_first_source_line (file, last_linenum)
 314      FILE *file;
 315      int last_linenum;
 316 {
 317   ASM_OUTPUT_LFB (file, last_linenum);
 318   dbxout_parms (DECL_ARGUMENTS (current_function_decl));
 319   ASM_OUTPUT_SOURCE_LINE (file, last_linenum);
 320 }
 321
 322 /* Output the symbols defined in block number DO_BLOCK.
 323    Set NEXT_BLOCK_NUMBER to 0 before calling.
 324
 325    This function works by walking the tree structure of blocks,
 326    counting blocks until it finds the desired block.  */
 327
 328 static int do_block = 0;
 329
 330 static int next_block_number;
 331
 332 static void
 333 xcoffout_block (block, depth, args)
 334      register tree block;
 335      int depth;
 336      tree args;
 337 {
 338   while (block)
 339     {
 340       /* Ignore blocks never expanded or otherwise marked as real.  */
 341       if (TREE_USED (block))
 342         {
 343           /* When we reach the specified block, output its symbols.  */
 344           if (next_block_number == do_block)
 345             {
 346               /* Output the syms of the block.  */
 347               if (debug_info_level != DINFO_LEVEL_TERSE || depth == 0)
 348                 dbxout_syms (BLOCK_VARS (block));
 349               if (args)
 350                 dbxout_reg_parms (args);
 351
 352               /* We are now done with the block.  Don't go to inner blocks.  */
 353               return;
 354             }
 355           /* If we are past the specified block, stop the scan.  */
 356           else if (next_block_number >= do_block)
 357             return;
 358
 359           next_block_number++;
 360
 361           /* Output the subblocks.  */
 362           xcoffout_block (BLOCK_SUBBLOCKS (block), depth + 1, 0);
 363         }
 364       block = BLOCK_CHAIN (block);
 365     }
 366 }
 367
 368 /* Describe the beginning of an internal block within a function.
 369    Also output descriptions of variables defined in this block.
 370
 371    N is the number of the block, by order of beginning, counting from 1,
 372    and not counting the outermost (function top-level) block.
 373    The blocks match the BLOCKs in DECL_INITIAL (current_function_decl),
 374    if the count starts at 0 for the outermost one.  */
 375
 376 void
 377 xcoffout_begin_block (file, line, n)
 378      FILE *file;
 379      int line;
 380      int n;
 381 {
 382   tree decl = current_function_decl;
 383
 384   ASM_OUTPUT_LBB (file, line, n);
 385
 386   do_block = n;
 387   next_block_number = 0;
 388   xcoffout_block (DECL_INITIAL (decl), 0, DECL_ARGUMENTS (decl));
 389 }
 390
 391 /* Describe the end line-number of an internal block within a function.  */
 392
 393 void
 394 xcoffout_end_block (file, line, n)
 395      FILE *file;
 396      int line;
 397      int n;
 398 {
 399   ASM_OUTPUT_LBE (file, line, n);
 400 }
 401
 402 /* Called at beginning of function body (after prologue).
 403    Record the function's starting line number, so we can output
 404    relative line numbers for the other lines.
 405    Record the file name that this function is contained in.  */
 406
 407 void
 408 xcoffout_begin_function (file, last_linenum)
 409      FILE *file;
 410      int last_linenum;
 411 {
 412   ASM_OUTPUT_LFB (file, last_linenum);
 413 }
 414
 415 /* Called at end of function (before epilogue).
 416    Describe end of outermost block.  */
 417
 418 void
 419 xcoffout_end_function (file, last_linenum)
 420      FILE *file;
 421      int last_linenum;
 422 {
 423   ASM_OUTPUT_LFE (file, last_linenum);
 424 }
 425
 426 /* Output xcoff info for the absolute end of a function.
 427    Called after the epilogue is output.  */
 428
 429 void
 430 xcoffout_end_epilogue (file)
 431      FILE *file;
 432 {
 433   /* We need to pass the correct function size to .function, otherwise,
 434      the xas assembler can't figure out the correct size for the function
 435      aux entry.  So, we emit a label after the last instruction which can
 436      be used by the .function pseudo op to calculate the function size.  */
 437
 438   char *fname = XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0);
 439   if (*fname == '*')
 440     ++fname;
 441   fprintf (file, "L..end_");
 442   ASM_OUTPUT_LABEL (file, fname);
 443 }
 444 #endif /* XCOFF_DEBUGGING_INFO */