1 /* Output xcoff-format symbol table information from GNU compiler. 2 Copyright (C) 1992, 1994, 1995, 1997, 1998, 1999, 2000, 2002, 2003, 2004, 3 2007, 2008, 2010 Free Software Foundation, Inc. 4 5 This file is part of GCC. 6 7 GCC is free software; you can redistribute it and/or modify it under 8 the terms of the GNU General Public License as published by the Free 9 Software Foundation; either version 3, or (at your option) any later 10 version. 11 12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 13 WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15 for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with GCC; see the file COPYING3. If not see 19 <http://www.gnu.org/licenses/>. */ 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 "config.h" 27 #include "system.h" 28 #include "coretypes.h" 29 #include "tm.h" 30 #include "tree.h" 31 #include "rtl.h" 32 #include "flags.h" 33 #include "diagnostic-core.h" 34 #include "output.h" 35 #include "ggc.h" 36 #include "target.h" 37 #include "debug.h" 38 39 #ifdef XCOFF_DEBUGGING_INFO 40 41 /* This defines the C_* storage classes. */ 42 #include "xcoff.h" 43 #include "xcoffout.h" 44 #include "dbxout.h" 45 #include "gstab.h" 46 47 /* Line number of beginning of current function, minus one. 48 Negative means not in a function or not using xcoff. */ 49 50 static int xcoff_begin_function_line = -1; 51 static int xcoff_inlining = 0; 52 53 /* Name of the current include file. */ 54 55 const char *xcoff_current_include_file; 56 57 /* Name of the current function file. This is the file the `.bf' is 58 emitted from. In case a line is emitted from a different file, 59 (by including that file of course), then the line number will be 60 absolute. */ 61 62 static const char *xcoff_current_function_file; 63 64 /* Names of bss and data sections. These should be unique names for each 65 compilation unit. */ 66 67 char *xcoff_bss_section_name; 68 char *xcoff_private_data_section_name; 69 char *xcoff_read_only_section_name; 70 71 /* Last source file name mentioned in a NOTE insn. */ 72 73 const char *xcoff_lastfile; 74 75 /* Macro definitions used below. */ 76 77 #define ABS_OR_RELATIVE_LINENO(LINENO) \ 78 ((xcoff_inlining) ? (LINENO) : (LINENO) - xcoff_begin_function_line) 79 80 /* Output source line numbers via ".line". */ 81 #define ASM_OUTPUT_LINE(FILE,LINENUM) \ 82 do \ 83 { \ 84 /* Make sure we're in a function and prevent output of .line 0, as \ 85 line # 0 is meant for symbol addresses in xcoff. Additionally, \ 86 line numbers are 'unsigned short' in 32-bit mode. */ \ 87 if (xcoff_begin_function_line >= 0) \ 88 { \ 89 int lno = ABS_OR_RELATIVE_LINENO (LINENUM); \ 90 if (lno > 0 && (TARGET_64BIT || lno <= (int)USHRT_MAX)) \ 91 fprintf (FILE, "\t.line\t%d\n", lno); \ 92 } \ 93 } \ 94 while (0) 95 96 #define ASM_OUTPUT_LFB(FILE,LINENUM) \ 97 { \ 98 if (xcoff_begin_function_line == -1) \ 99 { \ 100 xcoff_begin_function_line = (LINENUM) - 1;\ 101 fprintf (FILE, "\t.bf\t%d\n", (LINENUM)); \ 102 } \ 103 xcoff_current_function_file \ 104 = (xcoff_current_include_file \ 105 ? xcoff_current_include_file : main_input_filename); \ 106 } 107 108 #define ASM_OUTPUT_LFE(FILE,LINENUM) \ 109 do \ 110 { \ 111 fprintf (FILE, "\t.ef\t%d\n", (LINENUM)); \ 112 xcoff_begin_function_line = -1; \ 113 } \ 114 while (0) 115 116 #define ASM_OUTPUT_LBB(FILE,LINENUM,BLOCKNUM) \ 117 fprintf (FILE, "\t.bb\t%d\n", ABS_OR_RELATIVE_LINENO (LINENUM)) 118 119 #define ASM_OUTPUT_LBE(FILE,LINENUM,BLOCKNUM) \ 120 fprintf (FILE, "\t.eb\t%d\n", ABS_OR_RELATIVE_LINENO (LINENUM)) 121 122 static void xcoffout_block (tree, int, tree); 123 static void xcoffout_source_file (FILE *, const char *, int); 124 125 /* Support routines for XCOFF debugging info. */ 126 127 struct xcoff_type_number 128 { 129 const char *name; 130 int number; 131 }; 132 static const struct xcoff_type_number xcoff_type_numbers[] = { 133 { "int", -1 }, 134 { "char", -2 }, 135 { "short int", -3 }, 136 { "long int", -4 }, /* fiddled to -31 if 64 bits */ 137 { "unsigned char", -5 }, 138 { "signed char", -6 }, 139 { "short unsigned int", -7 }, 140 { "unsigned int", -8 }, 141 /* No such type "unsigned". */ 142 { "long unsigned int", -10 }, /* fiddled to -32 if 64 bits */ 143 { "void", -11 }, 144 { "float", -12 }, 145 { "double", -13 }, 146 { "long double", -14 }, 147 /* Pascal and Fortran types run from -15 to -29. */ 148 { "wchar", -30 }, /* XXX Should be "wchar_t" ? */ 149 { "long long int", -31 }, 150 { "long long unsigned int", -32 }, 151 /* Additional Fortran types run from -33 to -37. */ 152 153 /* ??? Should also handle built-in C++ and Obj-C types. There perhaps 154 aren't any that C doesn't already have. */ 155 }; 156 157 /* Returns an XCOFF fundamental type number for DECL (assumed to be a 158 TYPE_DECL), or 0 if dbxout.c should assign a type number normally. */ 159 int 160 xcoff_assign_fundamental_type_number (tree decl) 161 { 162 const char *name; 163 size_t i; 164 165 /* Do not waste time searching the list for non-intrinsic types. */ 166 if (DECL_NAME (decl) == 0 || ! DECL_IS_BUILTIN (decl)) 167 return 0; 168 169 name = IDENTIFIER_POINTER (DECL_NAME (decl)); 170 171 /* Linear search, blech, but the list is too small to bother 172 doing anything else. */ 173 for (i = 0; i < ARRAY_SIZE (xcoff_type_numbers); i++) 174 if (!strcmp (xcoff_type_numbers[i].name, name)) 175 goto found; 176 return 0; 177 178 found: 179 /* -4 and -10 should be replaced with -31 and -32, respectively, 180 when used for a 64-bit type. */ 181 if (int_size_in_bytes (TREE_TYPE (decl)) == 8) 182 { 183 if (xcoff_type_numbers[i].number == -4) 184 return -31; 185 if (xcoff_type_numbers[i].number == -10) 186 return -32; 187 } 188 return xcoff_type_numbers[i].number; 189 } 190 191 /* Print an error message for unrecognized stab codes. */ 192 193 #define UNKNOWN_STAB(STR) \ 194 internal_error ("no sclass for %s stab (0x%x)", STR, stab) 195 196 /* Conversion routine from BSD stabs to AIX storage classes. */ 197 198 int 199 stab_to_sclass (int stab) 200 { 201 switch (stab) 202 { 203 case N_GSYM: 204 return C_GSYM; 205 206 case N_FNAME: 207 UNKNOWN_STAB ("N_FNAME"); 208 209 case N_FUN: 210 return C_FUN; 211 212 case N_STSYM: 213 case N_LCSYM: 214 return C_STSYM; 215 216 case N_MAIN: 217 UNKNOWN_STAB ("N_MAIN"); 218 219 case N_RSYM: 220 return C_RSYM; 221 222 case N_SSYM: 223 UNKNOWN_STAB ("N_SSYM"); 224 225 case N_RPSYM: 226 return C_RPSYM; 227 228 case N_PSYM: 229 return C_PSYM; 230 case N_LSYM: 231 return C_LSYM; 232 case N_DECL: 233 return C_DECL; 234 case N_ENTRY: 235 return C_ENTRY; 236 237 case N_SO: 238 UNKNOWN_STAB ("N_SO"); 239 240 case N_SOL: 241 UNKNOWN_STAB ("N_SOL"); 242 243 case N_SLINE: 244 UNKNOWN_STAB ("N_SLINE"); 245 246 case N_DSLINE: 247 UNKNOWN_STAB ("N_DSLINE"); 248 249 case N_BSLINE: 250 UNKNOWN_STAB ("N_BSLINE"); 251 252 case N_BINCL: 253 UNKNOWN_STAB ("N_BINCL"); 254 255 case N_EINCL: 256 UNKNOWN_STAB ("N_EINCL"); 257 258 case N_EXCL: 259 UNKNOWN_STAB ("N_EXCL"); 260 261 case N_LBRAC: 262 UNKNOWN_STAB ("N_LBRAC"); 263 264 case N_RBRAC: 265 UNKNOWN_STAB ("N_RBRAC"); 266 267 case N_BCOMM: 268 return C_BCOMM; 269 case N_ECOMM: 270 return C_ECOMM; 271 case N_ECOML: 272 return C_ECOML; 273 274 case N_LENG: 275 UNKNOWN_STAB ("N_LENG"); 276 277 case N_PC: 278 UNKNOWN_STAB ("N_PC"); 279 280 case N_M2C: 281 UNKNOWN_STAB ("N_M2C"); 282 283 case N_SCOPE: 284 UNKNOWN_STAB ("N_SCOPE"); 285 286 case N_CATCH: 287 UNKNOWN_STAB ("N_CATCH"); 288 289 case N_OPT: 290 UNKNOWN_STAB ("N_OPT"); 291 292 default: 293 UNKNOWN_STAB ("?"); 294 } 295 } 296 297 /* Output debugging info to FILE to switch to sourcefile FILENAME. 298 INLINE_P is true if this is from an inlined function. */ 299 300 static void 301 xcoffout_source_file (FILE *file, const char *filename, int inline_p) 302 { 303 if (filename 304 && (xcoff_lastfile == 0 || strcmp (filename, xcoff_lastfile) 305 || (inline_p && ! xcoff_inlining) 306 || (! inline_p && xcoff_inlining))) 307 { 308 if (xcoff_current_include_file) 309 { 310 fprintf (file, "\t.ei\t"); 311 output_quoted_string (file, 312 remap_debug_filename (xcoff_current_include_file)); 313 fprintf (file, "\n"); 314 xcoff_current_include_file = NULL; 315 } 316 xcoff_inlining = inline_p; 317 if (strcmp (main_input_filename, filename) || inline_p) 318 { 319 fprintf (file, "\t.bi\t"); 320 output_quoted_string (file, remap_debug_filename (filename)); 321 fprintf (file, "\n"); 322 xcoff_current_include_file = filename; 323 } 324 xcoff_lastfile = filename; 325 } 326 } 327 328 /* Output a line number symbol entry for location (FILENAME, LINE). */ 329 330 void 331 xcoffout_source_line (unsigned int line, const char *filename, 332 int discriminator ATTRIBUTE_UNUSED, 333 bool is_stmt ATTRIBUTE_UNUSED) 334 { 335 bool inline_p = (strcmp (xcoff_current_function_file, filename) != 0 336 || (int) line < xcoff_begin_function_line); 337 338 xcoffout_source_file (asm_out_file, filename, inline_p); 339 340 ASM_OUTPUT_LINE (asm_out_file, line); 341 } 342 343 /* Output the symbols defined in block number DO_BLOCK. 344 345 This function works by walking the tree structure of blocks, 346 counting blocks until it finds the desired block. */ 347 348 static int do_block = 0; 349 350 static void 351 xcoffout_block (tree block, int depth, tree args) 352 { 353 while (block) 354 { 355 /* Ignore blocks never expanded or otherwise marked as real. */ 356 if (TREE_USED (block)) 357 { 358 /* When we reach the specified block, output its symbols. */ 359 if (BLOCK_NUMBER (block) == do_block) 360 { 361 /* Output the syms of the block. */ 362 if (debug_info_level != DINFO_LEVEL_TERSE || depth == 0) 363 dbxout_syms (BLOCK_VARS (block)); 364 if (args) 365 dbxout_reg_parms (args); 366 367 /* We are now done with the block. Don't go to inner blocks. */ 368 return; 369 } 370 /* If we are past the specified block, stop the scan. */ 371 else if (BLOCK_NUMBER (block) >= do_block) 372 return; 373 374 /* Output the subblocks. */ 375 xcoffout_block (BLOCK_SUBBLOCKS (block), depth + 1, NULL_TREE); 376 } 377 block = BLOCK_CHAIN (block); 378 } 379 } 380 381 /* Describe the beginning of an internal block within a function. 382 Also output descriptions of variables defined in this block. 383 384 N is the number of the block, by order of beginning, counting from 1, 385 and not counting the outermost (function top-level) block. 386 The blocks match the BLOCKs in DECL_INITIAL (current_function_decl), 387 if the count starts at 0 for the outermost one. */ 388 389 void 390 xcoffout_begin_block (unsigned int line, unsigned int n) 391 { 392 tree decl = current_function_decl; 393 394 /* The IBM AIX compiler does not emit a .bb for the function level scope, 395 so we avoid it here also. */ 396 if (n != 1) 397 ASM_OUTPUT_LBB (asm_out_file, line, n); 398 399 do_block = n; 400 xcoffout_block (DECL_INITIAL (decl), 0, DECL_ARGUMENTS (decl)); 401 } 402 403 /* Describe the end line-number of an internal block within a function. */ 404 405 void 406 xcoffout_end_block (unsigned int line, unsigned int n) 407 { 408 if (n != 1) 409 ASM_OUTPUT_LBE (asm_out_file, line, n); 410 } 411 412 /* Called at beginning of function (before prologue). 413 Declare function as needed for debugging. */ 414 415 void 416 xcoffout_declare_function (FILE *file, tree decl, const char *name) 417 { 418 size_t len; 419 420 if (*name == '*') 421 name++; 422 len = strlen (name); 423 if (name[len - 1] == ']') 424 { 425 char *n = XALLOCAVEC (char, len - 3); 426 memcpy (n, name, len - 4); 427 n[len - 4] = '\0'; 428 name = n; 429 } 430 431 /* Any pending .bi or .ei must occur before the .function pseudo op. 432 Otherwise debuggers will think that the function is in the previous 433 file and/or at the wrong line number. */ 434 xcoffout_source_file (file, DECL_SOURCE_FILE (decl), 0); 435 dbxout_symbol (decl, 0); 436 437 /* .function NAME, TOP, MAPPING, TYPE, SIZE 438 16 and 044 are placeholders for backwards compatibility */ 439 fprintf (file, "\t.function .%s,.%s,16,044,FE..%s-.%s\n", 440 name, name, name, name); 441 } 442 443 /* Called at beginning of function body (at start of prologue). 444 Record the function's starting line number, so we can output 445 relative line numbers for the other lines. 446 Record the file name that this function is contained in. */ 447 448 void 449 xcoffout_begin_prologue (unsigned int line, 450 const char *file ATTRIBUTE_UNUSED) 451 { 452 ASM_OUTPUT_LFB (asm_out_file, line); 453 dbxout_parms (DECL_ARGUMENTS (current_function_decl)); 454 455 /* Emit the symbols for the outermost BLOCK's variables. sdbout.c does this 456 in sdbout_begin_block, but there is no guarantee that there will be any 457 inner block 1, so we must do it here. This gives a result similar to 458 dbxout, so it does make some sense. */ 459 do_block = BLOCK_NUMBER (DECL_INITIAL (current_function_decl)); 460 xcoffout_block (DECL_INITIAL (current_function_decl), 0, 461 DECL_ARGUMENTS (current_function_decl)); 462 463 ASM_OUTPUT_LINE (asm_out_file, line); 464 } 465 466 /* Called at end of function (before epilogue). 467 Describe end of outermost block. */ 468 469 void 470 xcoffout_end_function (unsigned int last_linenum) 471 { 472 ASM_OUTPUT_LFE (asm_out_file, last_linenum); 473 } 474 475 /* Output xcoff info for the absolute end of a function. 476 Called after the epilogue is output. */ 477 478 void 479 xcoffout_end_epilogue (unsigned int line ATTRIBUTE_UNUSED, 480 const char *file ATTRIBUTE_UNUSED) 481 { 482 /* We need to pass the correct function size to .function, otherwise, 483 the xas assembler can't figure out the correct size for the function 484 aux entry. So, we emit a label after the last instruction which can 485 be used by the .function pseudo op to calculate the function size. */ 486 487 const char *fname = XSTR (XEXP (DECL_RTL (current_function_decl), 0), 0); 488 if (*fname == '*') 489 ++fname; 490 fprintf (asm_out_file, "FE.."); 491 ASM_OUTPUT_LABEL (asm_out_file, fname); 492 } 493 #endif /* XCOFF_DEBUGGING_INFO */ 494