1 /* Output sdb-format symbol table information from GNU compiler. 2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 3 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011 4 Free Software Foundation, Inc. 5 6 This file is part of GCC. 7 8 GCC is free software; you can redistribute it and/or modify it under 9 the terms of the GNU General Public License as published by the Free 10 Software Foundation; either version 3, or (at your option) any later 11 version. 12 13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 14 WARRANTY; without even the implied warranty of MERCHANTABILITY or 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 16 for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with GCC; see the file COPYING3. If not see 20 <http://www.gnu.org/licenses/>. */ 21 22 /* mike@tredysvr.Tredydev.Unisys.COM says: 23 I modified the struct.c example and have a nm of a .o resulting from the 24 AT&T C compiler. From the example below I would conclude the following: 25 26 1. All .defs from structures are emitted as scanned. The example below 27 clearly shows the symbol table entries for BoxRec2 are after the first 28 function. 29 30 2. All functions and their locals (including statics) are emitted as scanned. 31 32 3. All nested unnamed union and structure .defs must be emitted before 33 the structure in which they are nested. The AT&T assembler is a 34 one pass beast as far as symbolics are concerned. 35 36 4. All structure .defs are emitted before the typedefs that refer to them. 37 38 5. All top level static and external variable definitions are moved to the 39 end of file with all top level statics occurring first before externs. 40 41 6. All undefined references are at the end of the file. 42 */ 43 44 #include "config.h" 45 #include "system.h" 46 #include "coretypes.h" 47 #include "tm.h" 48 #include "debug.h" 49 #include "tree.h" 50 #include "ggc.h" 51 #include "vec.h" 52 53 static GTY(()) tree anonymous_types; 54 55 /* Counter to generate unique "names" for nameless struct members. */ 56 57 static GTY(()) int unnamed_struct_number; 58 59 /* Declarations whose debug info was deferred till end of compilation. */ 60 61 static GTY(()) VEC(tree,gc) *deferred_global_decls; 62 63 /* The C front end may call sdbout_symbol before sdbout_init runs. 64 We save all such decls in this list and output them when we get 65 to sdbout_init. */ 66 67 static GTY(()) tree preinit_symbols; 68 static GTY(()) bool sdbout_initialized; 69 70 #ifdef SDB_DEBUGGING_INFO 71 72 #include "rtl.h" 73 #include "regs.h" 74 #include "flags.h" 75 #include "insn-config.h" 76 #include "reload.h" 77 #include "output.h" 78 #include "diagnostic-core.h" 79 #include "tm_p.h" 80 #include "gsyms.h" 81 #include "langhooks.h" 82 #include "target.h" 83 84 /* 1 if PARM is passed to this function in memory. */ 85 86 #define PARM_PASSED_IN_MEMORY(PARM) \ 87 (MEM_P (DECL_INCOMING_RTL (PARM))) 88 89 /* A C expression for the integer offset value of an automatic variable 90 (C_AUTO) having address X (an RTX). */ 91 #ifndef DEBUGGER_AUTO_OFFSET 92 #define DEBUGGER_AUTO_OFFSET(X) \ 93 (GET_CODE (X) == PLUS ? INTVAL (XEXP (X, 1)) : 0) 94 #endif 95 96 /* A C expression for the integer offset value of an argument (C_ARG) 97 having address X (an RTX). The nominal offset is OFFSET. */ 98 #ifndef DEBUGGER_ARG_OFFSET 99 #define DEBUGGER_ARG_OFFSET(OFFSET, X) (OFFSET) 100 #endif 101 102 /* Line number of beginning of current function, minus one. 103 Negative means not in a function or not using sdb. */ 104 105 int sdb_begin_function_line = -1; 106 107 108 extern FILE *asm_out_file; 109 110 extern tree current_function_decl; 111 112 #include "sdbout.h" 113 114 static void sdbout_init (const char *); 115 static void sdbout_finish (const char *); 116 static void sdbout_start_source_file (unsigned int, const char *); 117 static void sdbout_end_source_file (unsigned int); 118 static void sdbout_begin_block (unsigned int, unsigned int); 119 static void sdbout_end_block (unsigned int, unsigned int); 120 static void sdbout_source_line (unsigned int, const char *, int, bool); 121 static void sdbout_end_epilogue (unsigned int, const char *); 122 static void sdbout_global_decl (tree); 123 #ifndef MIPS_DEBUGGING_INFO 124 static void sdbout_begin_prologue (unsigned int, const char *); 125 #endif 126 static void sdbout_end_prologue (unsigned int, const char *); 127 static void sdbout_begin_function (tree); 128 static void sdbout_end_function (unsigned int); 129 static void sdbout_toplevel_data (tree); 130 static void sdbout_label (rtx); 131 static char *gen_fake_label (void); 132 static int plain_type (tree); 133 static int template_name_p (tree); 134 static void sdbout_record_type_name (tree); 135 static int plain_type_1 (tree, int); 136 static void sdbout_block (tree); 137 static void sdbout_syms (tree); 138 #ifdef SDB_ALLOW_FORWARD_REFERENCES 139 static void sdbout_queue_anonymous_type (tree); 140 static void sdbout_dequeue_anonymous_types (void); 141 #endif 142 static void sdbout_type (tree); 143 static void sdbout_field_types (tree); 144 static void sdbout_one_type (tree); 145 static void sdbout_parms (tree); 146 static void sdbout_reg_parms (tree); 147 static void sdbout_global_decl (tree); 148 149 /* Random macros describing parts of SDB data. */ 150 151 /* Default value of delimiter is ";". */ 152 #ifndef SDB_DELIM 153 #define SDB_DELIM ";" 154 #endif 155 156 /* Maximum number of dimensions the assembler will allow. */ 157 #ifndef SDB_MAX_DIM 158 #define SDB_MAX_DIM 4 159 #endif 160 161 #ifndef PUT_SDB_SCL 162 #define PUT_SDB_SCL(a) fprintf(asm_out_file, "\t.scl\t%d%s", (a), SDB_DELIM) 163 #endif 164 165 #ifndef PUT_SDB_INT_VAL 166 #define PUT_SDB_INT_VAL(a) \ 167 do { \ 168 fprintf (asm_out_file, "\t.val\t" HOST_WIDE_INT_PRINT_DEC "%s", \ 169 (HOST_WIDE_INT) (a), SDB_DELIM); \ 170 } while (0) 171 172 #endif 173 174 #ifndef PUT_SDB_VAL 175 #define PUT_SDB_VAL(a) \ 176 ( fputs ("\t.val\t", asm_out_file), \ 177 output_addr_const (asm_out_file, (a)), \ 178 fprintf (asm_out_file, SDB_DELIM)) 179 #endif 180 181 #ifndef PUT_SDB_DEF 182 #define PUT_SDB_DEF(a) \ 183 do { fprintf (asm_out_file, "\t.def\t"); \ 184 assemble_name (asm_out_file, a); \ 185 fprintf (asm_out_file, SDB_DELIM); } while (0) 186 #endif 187 188 #ifndef PUT_SDB_PLAIN_DEF 189 #define PUT_SDB_PLAIN_DEF(a) fprintf(asm_out_file,"\t.def\t.%s%s",a, SDB_DELIM) 190 #endif 191 192 #ifndef PUT_SDB_ENDEF 193 #define PUT_SDB_ENDEF fputs("\t.endef\n", asm_out_file) 194 #endif 195 196 #ifndef PUT_SDB_TYPE 197 #define PUT_SDB_TYPE(a) fprintf(asm_out_file, "\t.type\t0%o%s", a, SDB_DELIM) 198 #endif 199 200 #ifndef PUT_SDB_SIZE 201 #define PUT_SDB_SIZE(a) \ 202 do { \ 203 fprintf (asm_out_file, "\t.size\t" HOST_WIDE_INT_PRINT_DEC "%s", \ 204 (HOST_WIDE_INT) (a), SDB_DELIM); \ 205 } while(0) 206 #endif 207 208 #ifndef PUT_SDB_START_DIM 209 #define PUT_SDB_START_DIM fprintf(asm_out_file, "\t.dim\t") 210 #endif 211 212 #ifndef PUT_SDB_NEXT_DIM 213 #define PUT_SDB_NEXT_DIM(a) fprintf(asm_out_file, "%d,", a) 214 #endif 215 216 #ifndef PUT_SDB_LAST_DIM 217 #define PUT_SDB_LAST_DIM(a) fprintf(asm_out_file, "%d%s", a, SDB_DELIM) 218 #endif 219 220 #ifndef PUT_SDB_TAG 221 #define PUT_SDB_TAG(a) \ 222 do { fprintf (asm_out_file, "\t.tag\t"); \ 223 assemble_name (asm_out_file, a); \ 224 fprintf (asm_out_file, SDB_DELIM); } while (0) 225 #endif 226 227 #ifndef PUT_SDB_BLOCK_START 228 #define PUT_SDB_BLOCK_START(LINE) \ 229 fprintf (asm_out_file, \ 230 "\t.def\t.bb%s\t.val\t.%s\t.scl\t100%s\t.line\t%d%s\t.endef\n", \ 231 SDB_DELIM, SDB_DELIM, SDB_DELIM, (LINE), SDB_DELIM) 232 #endif 233 234 #ifndef PUT_SDB_BLOCK_END 235 #define PUT_SDB_BLOCK_END(LINE) \ 236 fprintf (asm_out_file, \ 237 "\t.def\t.eb%s\t.val\t.%s\t.scl\t100%s\t.line\t%d%s\t.endef\n", \ 238 SDB_DELIM, SDB_DELIM, SDB_DELIM, (LINE), SDB_DELIM) 239 #endif 240 241 #ifndef PUT_SDB_FUNCTION_START 242 #define PUT_SDB_FUNCTION_START(LINE) \ 243 fprintf (asm_out_file, \ 244 "\t.def\t.bf%s\t.val\t.%s\t.scl\t101%s\t.line\t%d%s\t.endef\n", \ 245 SDB_DELIM, SDB_DELIM, SDB_DELIM, (LINE), SDB_DELIM) 246 #endif 247 248 #ifndef PUT_SDB_FUNCTION_END 249 #define PUT_SDB_FUNCTION_END(LINE) \ 250 fprintf (asm_out_file, \ 251 "\t.def\t.ef%s\t.val\t.%s\t.scl\t101%s\t.line\t%d%s\t.endef\n", \ 252 SDB_DELIM, SDB_DELIM, SDB_DELIM, (LINE), SDB_DELIM) 253 #endif 254 255 /* Return the sdb tag identifier string for TYPE 256 if TYPE has already been defined; otherwise return a null pointer. */ 257 258 #define KNOWN_TYPE_TAG(type) TYPE_SYMTAB_POINTER (type) 259 260 /* Set the sdb tag identifier string for TYPE to NAME. */ 261 262 #define SET_KNOWN_TYPE_TAG(TYPE, NAME) \ 263 TYPE_SYMTAB_POINTER (TYPE) = (const char *)(NAME) 264 265 /* Return the name (a string) of the struct, union or enum tag 266 described by the TREE_LIST node LINK. This is 0 for an anonymous one. */ 267 268 #define TAG_NAME(link) \ 269 (((link) && TREE_PURPOSE ((link)) \ 270 && IDENTIFIER_POINTER (TREE_PURPOSE ((link)))) \ 271 ? IDENTIFIER_POINTER (TREE_PURPOSE ((link))) : (char *) 0) 272 273 /* Ensure we don't output a negative line number. */ 274 #define MAKE_LINE_SAFE(line) \ 275 if ((int) line <= sdb_begin_function_line) \ 276 line = sdb_begin_function_line + 1 277 278 /* Perform linker optimization of merging header file definitions together 279 for targets with MIPS_DEBUGGING_INFO defined. This won't work without a 280 post 960826 version of GAS. Nothing breaks with earlier versions of GAS, 281 the optimization just won't be done. The native assembler already has the 282 necessary support. */ 283 284 #ifdef MIPS_DEBUGGING_INFO 285 286 /* ECOFF linkers have an optimization that does the same kind of thing as 287 N_BINCL/E_INCL in stabs: eliminate duplicate debug information in the 288 executable. To achieve this, GCC must output a .file for each file 289 name change. */ 290 291 /* This is a stack of input files. */ 292 293 struct sdb_file 294 { 295 struct sdb_file *next; 296 const char *name; 297 }; 298 299 /* This is the top of the stack. */ 300 301 static struct sdb_file *current_file; 302 303 #endif /* MIPS_DEBUGGING_INFO */ 304 305 /* The debug hooks structure. */ 306 const struct gcc_debug_hooks sdb_debug_hooks = 307 { 308 sdbout_init, /* init */ 309 sdbout_finish, /* finish */ 310 debug_nothing_void, /* assembly_start */ 311 debug_nothing_int_charstar, /* define */ 312 debug_nothing_int_charstar, /* undef */ 313 sdbout_start_source_file, /* start_source_file */ 314 sdbout_end_source_file, /* end_source_file */ 315 sdbout_begin_block, /* begin_block */ 316 sdbout_end_block, /* end_block */ 317 debug_true_const_tree, /* ignore_block */ 318 sdbout_source_line, /* source_line */ 319 #ifdef MIPS_DEBUGGING_INFO 320 /* Defer on MIPS systems so that parameter descriptions follow 321 function entry. */ 322 debug_nothing_int_charstar, /* begin_prologue */ 323 sdbout_end_prologue, /* end_prologue */ 324 #else 325 sdbout_begin_prologue, /* begin_prologue */ 326 debug_nothing_int_charstar, /* end_prologue */ 327 #endif 328 debug_nothing_int_charstar, /* begin_epilogue */ 329 sdbout_end_epilogue, /* end_epilogue */ 330 sdbout_begin_function, /* begin_function */ 331 sdbout_end_function, /* end_function */ 332 debug_nothing_tree, /* function_decl */ 333 sdbout_global_decl, /* global_decl */ 334 sdbout_symbol, /* type_decl */ 335 debug_nothing_tree_tree_tree_bool, /* imported_module_or_decl */ 336 debug_nothing_tree, /* deferred_inline_function */ 337 debug_nothing_tree, /* outlining_inline_function */ 338 sdbout_label, /* label */ 339 debug_nothing_int, /* handle_pch */ 340 debug_nothing_rtx, /* var_location */ 341 debug_nothing_void, /* switch_text_section */ 342 debug_nothing_tree_tree, /* set_name */ 343 0, /* start_end_main_source_file */ 344 TYPE_SYMTAB_IS_POINTER /* tree_type_symtab_field */ 345 }; 346 347 /* Return a unique string to name an anonymous type. */ 348 349 static char * 350 gen_fake_label (void) 351 { 352 char label[10]; 353 char *labelstr; 354 sprintf (label, ".%dfake", unnamed_struct_number); 355 unnamed_struct_number++; 356 labelstr = xstrdup (label); 357 return labelstr; 358 } 359 360 /* Return the number which describes TYPE for SDB. 361 For pointers, etc., this function is recursive. 362 Each record, union or enumeral type must already have had a 363 tag number output. */ 364 365 /* The number is given by d6d5d4d3d2d1bbbb 366 where bbbb is 4 bit basic type, and di indicate one of notype,ptr,fn,array. 367 Thus, char *foo () has bbbb=T_CHAR 368 d1=D_FCN 369 d2=D_PTR 370 N_BTMASK= 017 1111 basic type field. 371 N_TSHIFT= 2 derived type shift 372 N_BTSHFT= 4 Basic type shift */ 373 374 /* Produce the number that describes a pointer, function or array type. 375 PREV is the number describing the target, value or element type. 376 DT_type describes how to transform that type. */ 377 #define PUSH_DERIVED_LEVEL(DT_type,PREV) \ 378 ((((PREV) & ~(int) N_BTMASK) << (int) N_TSHIFT) \ 379 | ((int) DT_type << (int) N_BTSHFT) \ 380 | ((PREV) & (int) N_BTMASK)) 381 382 /* Number of elements used in sdb_dims. */ 383 static int sdb_n_dims = 0; 384 385 /* Table of array dimensions of current type. */ 386 static int sdb_dims[SDB_MAX_DIM]; 387 388 /* Size of outermost array currently being processed. */ 389 static int sdb_type_size = -1; 390 391 static int 392 plain_type (tree type) 393 { 394 int val = plain_type_1 (type, 0); 395 396 /* If we have already saved up some array dimensions, print them now. */ 397 if (sdb_n_dims > 0) 398 { 399 int i; 400 PUT_SDB_START_DIM; 401 for (i = sdb_n_dims - 1; i > 0; i--) 402 PUT_SDB_NEXT_DIM (sdb_dims[i]); 403 PUT_SDB_LAST_DIM (sdb_dims[0]); 404 sdb_n_dims = 0; 405 406 sdb_type_size = int_size_in_bytes (type); 407 /* Don't kill sdb if type is not laid out or has variable size. */ 408 if (sdb_type_size < 0) 409 sdb_type_size = 0; 410 } 411 /* If we have computed the size of an array containing this type, 412 print it now. */ 413 if (sdb_type_size >= 0) 414 { 415 PUT_SDB_SIZE (sdb_type_size); 416 sdb_type_size = -1; 417 } 418 return val; 419 } 420 421 static int 422 template_name_p (tree name) 423 { 424 const char *ptr = IDENTIFIER_POINTER (name); 425 while (*ptr && *ptr != '<') 426 ptr++; 427 428 return *ptr != '\0'; 429 } 430 431 static void 432 sdbout_record_type_name (tree type) 433 { 434 const char *name = 0; 435 int no_name; 436 437 if (KNOWN_TYPE_TAG (type)) 438 return; 439 440 if (TYPE_NAME (type) != 0) 441 { 442 tree t = 0; 443 444 /* Find the IDENTIFIER_NODE for the type name. */ 445 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE) 446 t = TYPE_NAME (type); 447 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL) 448 { 449 t = DECL_NAME (TYPE_NAME (type)); 450 /* The DECL_NAME for templates includes "<>", which breaks 451 most assemblers. Use its assembler name instead, which 452 has been mangled into being safe. */ 453 if (t && template_name_p (t)) 454 t = DECL_ASSEMBLER_NAME (TYPE_NAME (type)); 455 } 456 457 /* Now get the name as a string, or invent one. */ 458 if (t != NULL_TREE) 459 name = IDENTIFIER_POINTER (t); 460 } 461 462 no_name = (name == 0 || *name == 0); 463 if (no_name) 464 name = gen_fake_label (); 465 466 SET_KNOWN_TYPE_TAG (type, name); 467 #ifdef SDB_ALLOW_FORWARD_REFERENCES 468 if (no_name) 469 sdbout_queue_anonymous_type (type); 470 #endif 471 } 472 473 /* Return the .type value for type TYPE. 474 475 LEVEL indicates how many levels deep we have recursed into the type. 476 The SDB debug format can only represent 6 derived levels of types. 477 After that, we must output inaccurate debug info. We deliberately 478 stop before the 7th level, so that ADA recursive types will not give an 479 infinite loop. */ 480 481 static int 482 plain_type_1 (tree type, int level) 483 { 484 if (type == 0) 485 type = void_type_node; 486 else if (type == error_mark_node) 487 type = integer_type_node; 488 else 489 type = TYPE_MAIN_VARIANT (type); 490 491 switch (TREE_CODE (type)) 492 { 493 case VOID_TYPE: 494 case NULLPTR_TYPE: 495 return T_VOID; 496 case BOOLEAN_TYPE: 497 case INTEGER_TYPE: 498 { 499 int size = int_size_in_bytes (type) * BITS_PER_UNIT; 500 501 /* Carefully distinguish all the standard types of C, 502 without messing up if the language is not C. 503 Note that we check only for the names that contain spaces; 504 other names might occur by coincidence in other languages. */ 505 if (TYPE_NAME (type) != 0 506 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL 507 && DECL_NAME (TYPE_NAME (type)) != 0 508 && TREE_CODE (DECL_NAME (TYPE_NAME (type))) == IDENTIFIER_NODE) 509 { 510 const char *const name 511 = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))); 512 513 if (!strcmp (name, "char")) 514 return T_CHAR; 515 if (!strcmp (name, "unsigned char")) 516 return T_UCHAR; 517 if (!strcmp (name, "signed char")) 518 return T_CHAR; 519 if (!strcmp (name, "int")) 520 return T_INT; 521 if (!strcmp (name, "unsigned int")) 522 return T_UINT; 523 if (!strcmp (name, "short int")) 524 return T_SHORT; 525 if (!strcmp (name, "short unsigned int")) 526 return T_USHORT; 527 if (!strcmp (name, "long int")) 528 return T_LONG; 529 if (!strcmp (name, "long unsigned int")) 530 return T_ULONG; 531 } 532 533 if (size == INT_TYPE_SIZE) 534 return (TYPE_UNSIGNED (type) ? T_UINT : T_INT); 535 if (size == CHAR_TYPE_SIZE) 536 return (TYPE_UNSIGNED (type) ? T_UCHAR : T_CHAR); 537 if (size == SHORT_TYPE_SIZE) 538 return (TYPE_UNSIGNED (type) ? T_USHORT : T_SHORT); 539 if (size == LONG_TYPE_SIZE) 540 return (TYPE_UNSIGNED (type) ? T_ULONG : T_LONG); 541 if (size == LONG_LONG_TYPE_SIZE) /* better than nothing */ 542 return (TYPE_UNSIGNED (type) ? T_ULONG : T_LONG); 543 return 0; 544 } 545 546 case REAL_TYPE: 547 { 548 int precision = TYPE_PRECISION (type); 549 if (precision == FLOAT_TYPE_SIZE) 550 return T_FLOAT; 551 if (precision == DOUBLE_TYPE_SIZE) 552 return T_DOUBLE; 553 #ifdef EXTENDED_SDB_BASIC_TYPES 554 if (precision == LONG_DOUBLE_TYPE_SIZE) 555 return T_LNGDBL; 556 #else 557 if (precision == LONG_DOUBLE_TYPE_SIZE) 558 return T_DOUBLE; /* better than nothing */ 559 #endif 560 return 0; 561 } 562 563 case ARRAY_TYPE: 564 { 565 int m; 566 if (level >= 6) 567 return T_VOID; 568 else 569 m = plain_type_1 (TREE_TYPE (type), level+1); 570 if (sdb_n_dims < SDB_MAX_DIM) 571 sdb_dims[sdb_n_dims++] 572 = (TYPE_DOMAIN (type) 573 && TYPE_MIN_VALUE (TYPE_DOMAIN (type)) != 0 574 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) != 0 575 && host_integerp (TYPE_MAX_VALUE (TYPE_DOMAIN (type)), 0) 576 && host_integerp (TYPE_MIN_VALUE (TYPE_DOMAIN (type)), 0) 577 ? (tree_low_cst (TYPE_MAX_VALUE (TYPE_DOMAIN (type)), 0) 578 - tree_low_cst (TYPE_MIN_VALUE (TYPE_DOMAIN (type)), 0) + 1) 579 : 0); 580 581 return PUSH_DERIVED_LEVEL (DT_ARY, m); 582 } 583 584 case RECORD_TYPE: 585 case UNION_TYPE: 586 case QUAL_UNION_TYPE: 587 case ENUMERAL_TYPE: 588 { 589 const char *tag; 590 #ifdef SDB_ALLOW_FORWARD_REFERENCES 591 sdbout_record_type_name (type); 592 #endif 593 #ifndef SDB_ALLOW_UNKNOWN_REFERENCES 594 if ((TREE_ASM_WRITTEN (type) && KNOWN_TYPE_TAG (type) != 0) 595 #ifdef SDB_ALLOW_FORWARD_REFERENCES 596 || TYPE_MODE (type) != VOIDmode 597 #endif 598 ) 599 #endif 600 { 601 /* Output the referenced structure tag name 602 only if the .def has already been finished. 603 At least on 386, the Unix assembler 604 cannot handle forward references to tags. */ 605 /* But the 88100, it requires them, sigh... */ 606 /* And the MIPS requires unknown refs as well... */ 607 tag = KNOWN_TYPE_TAG (type); 608 PUT_SDB_TAG (tag); 609 /* These 3 lines used to follow the close brace. 610 However, a size of 0 without a tag implies a tag of 0, 611 so if we don't know a tag, we can't mention the size. */ 612 sdb_type_size = int_size_in_bytes (type); 613 if (sdb_type_size < 0) 614 sdb_type_size = 0; 615 } 616 return ((TREE_CODE (type) == RECORD_TYPE) ? T_STRUCT 617 : (TREE_CODE (type) == UNION_TYPE) ? T_UNION 618 : (TREE_CODE (type) == QUAL_UNION_TYPE) ? T_UNION 619 : T_ENUM); 620 } 621 case POINTER_TYPE: 622 case REFERENCE_TYPE: 623 { 624 int m; 625 if (level >= 6) 626 return T_VOID; 627 else 628 m = plain_type_1 (TREE_TYPE (type), level+1); 629 return PUSH_DERIVED_LEVEL (DT_PTR, m); 630 } 631 case FUNCTION_TYPE: 632 case METHOD_TYPE: 633 { 634 int m; 635 if (level >= 6) 636 return T_VOID; 637 else 638 m = plain_type_1 (TREE_TYPE (type), level+1); 639 return PUSH_DERIVED_LEVEL (DT_FCN, m); 640 } 641 default: 642 return 0; 643 } 644 } 645 646 /* Output the symbols defined in block number DO_BLOCK. 647 648 This function works by walking the tree structure of blocks, 649 counting blocks until it finds the desired block. */ 650 651 static int do_block = 0; 652 653 static void 654 sdbout_block (tree block) 655 { 656 while (block) 657 { 658 /* Ignore blocks never expanded or otherwise marked as real. */ 659 if (TREE_USED (block)) 660 { 661 /* When we reach the specified block, output its symbols. */ 662 if (BLOCK_NUMBER (block) == do_block) 663 sdbout_syms (BLOCK_VARS (block)); 664 665 /* If we are past the specified block, stop the scan. */ 666 if (BLOCK_NUMBER (block) > do_block) 667 return; 668 669 /* Scan the blocks within this block. */ 670 sdbout_block (BLOCK_SUBBLOCKS (block)); 671 } 672 673 block = BLOCK_CHAIN (block); 674 } 675 } 676 677 /* Call sdbout_symbol on each decl in the chain SYMS. */ 678 679 static void 680 sdbout_syms (tree syms) 681 { 682 while (syms) 683 { 684 if (TREE_CODE (syms) != LABEL_DECL) 685 sdbout_symbol (syms, 1); 686 syms = TREE_CHAIN (syms); 687 } 688 } 689 690 /* Output SDB information for a symbol described by DECL. 691 LOCAL is nonzero if the symbol is not file-scope. */ 692 693 void 694 sdbout_symbol (tree decl, int local) 695 { 696 tree type = TREE_TYPE (decl); 697 tree context = NULL_TREE; 698 rtx value; 699 int regno = -1; 700 const char *name; 701 702 /* If we are called before sdbout_init is run, just save the symbol 703 for later. */ 704 if (!sdbout_initialized) 705 { 706 preinit_symbols = tree_cons (0, decl, preinit_symbols); 707 return; 708 } 709 710 sdbout_one_type (type); 711 712 switch (TREE_CODE (decl)) 713 { 714 case CONST_DECL: 715 /* Enum values are defined by defining the enum type. */ 716 return; 717 718 case FUNCTION_DECL: 719 /* Don't mention a nested function under its parent. */ 720 context = decl_function_context (decl); 721 if (context == current_function_decl) 722 return; 723 /* Check DECL_INITIAL to distinguish declarations from definitions. 724 Don't output debug info here for declarations; they will have 725 a DECL_INITIAL value of 0. */ 726 if (! DECL_INITIAL (decl)) 727 return; 728 if (!MEM_P (DECL_RTL (decl)) 729 || GET_CODE (XEXP (DECL_RTL (decl), 0)) != SYMBOL_REF) 730 return; 731 PUT_SDB_DEF (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl))); 732 PUT_SDB_VAL (XEXP (DECL_RTL (decl), 0)); 733 PUT_SDB_SCL (TREE_PUBLIC (decl) ? C_EXT : C_STAT); 734 break; 735 736 case TYPE_DECL: 737 /* Done with tagged types. */ 738 if (DECL_NAME (decl) == 0) 739 return; 740 if (DECL_IGNORED_P (decl)) 741 return; 742 /* Don't output intrinsic types. GAS chokes on SDB .def 743 statements that contain identifiers with embedded spaces 744 (eg "unsigned long"). */ 745 if (DECL_IS_BUILTIN (decl)) 746 return; 747 748 /* Output typedef name. */ 749 if (template_name_p (DECL_NAME (decl))) 750 PUT_SDB_DEF (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl))); 751 else 752 PUT_SDB_DEF (IDENTIFIER_POINTER (DECL_NAME (decl))); 753 PUT_SDB_SCL (C_TPDEF); 754 break; 755 756 case PARM_DECL: 757 /* Parm decls go in their own separate chains 758 and are output by sdbout_reg_parms and sdbout_parms. */ 759 gcc_unreachable (); 760 761 case VAR_DECL: 762 /* Don't mention a variable that is external. 763 Let the file that defines it describe it. */ 764 if (DECL_EXTERNAL (decl)) 765 return; 766 767 /* Ignore __FUNCTION__, etc. */ 768 if (DECL_IGNORED_P (decl)) 769 return; 770 771 /* If there was an error in the declaration, don't dump core 772 if there is no RTL associated with the variable doesn't 773 exist. */ 774 if (!DECL_RTL_SET_P (decl)) 775 return; 776 777 SET_DECL_RTL (decl, 778 eliminate_regs (DECL_RTL (decl), VOIDmode, NULL_RTX)); 779 #ifdef LEAF_REG_REMAP 780 if (current_function_uses_only_leaf_regs) 781 leaf_renumber_regs_insn (DECL_RTL (decl)); 782 #endif 783 value = DECL_RTL (decl); 784 785 /* Don't mention a variable at all 786 if it was completely optimized into nothingness. 787 788 If DECL was from an inline function, then its rtl 789 is not identically the rtl that was used in this 790 particular compilation. */ 791 if (REG_P (value)) 792 { 793 regno = REGNO (value); 794 if (regno >= FIRST_PSEUDO_REGISTER) 795 return; 796 } 797 else if (GET_CODE (value) == SUBREG) 798 { 799 while (GET_CODE (value) == SUBREG) 800 value = SUBREG_REG (value); 801 if (REG_P (value)) 802 { 803 if (REGNO (value) >= FIRST_PSEUDO_REGISTER) 804 return; 805 } 806 regno = REGNO (alter_subreg (&value)); 807 SET_DECL_RTL (decl, value); 808 } 809 /* Don't output anything if an auto variable 810 gets RTL that is static. 811 GAS version 2.2 can't handle such output. */ 812 else if (MEM_P (value) && CONSTANT_P (XEXP (value, 0)) 813 && ! TREE_STATIC (decl)) 814 return; 815 816 /* Emit any structure, union, or enum type that has not been output. 817 This occurs for tag-less structs (et al) used to declare variables 818 within functions. */ 819 if (TREE_CODE (type) == ENUMERAL_TYPE 820 || TREE_CODE (type) == RECORD_TYPE 821 || TREE_CODE (type) == UNION_TYPE 822 || TREE_CODE (type) == QUAL_UNION_TYPE) 823 { 824 if (COMPLETE_TYPE_P (type) /* not a forward reference */ 825 && KNOWN_TYPE_TAG (type) == 0) /* not yet declared */ 826 sdbout_one_type (type); 827 } 828 829 /* Defer SDB information for top-level initialized variables! */ 830 if (! local 831 && MEM_P (value) 832 && DECL_INITIAL (decl)) 833 return; 834 835 /* C++ in 2.3 makes nameless symbols. That will be fixed later. 836 For now, avoid crashing. */ 837 if (DECL_NAME (decl) == NULL_TREE) 838 return; 839 840 /* Record the name for, starting a symtab entry. */ 841 if (local) 842 name = IDENTIFIER_POINTER (DECL_NAME (decl)); 843 else 844 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)); 845 846 if (MEM_P (value) 847 && GET_CODE (XEXP (value, 0)) == SYMBOL_REF) 848 { 849 PUT_SDB_DEF (name); 850 if (TREE_PUBLIC (decl)) 851 { 852 PUT_SDB_VAL (XEXP (value, 0)); 853 PUT_SDB_SCL (C_EXT); 854 } 855 else 856 { 857 PUT_SDB_VAL (XEXP (value, 0)); 858 PUT_SDB_SCL (C_STAT); 859 } 860 } 861 else if (regno >= 0) 862 { 863 PUT_SDB_DEF (name); 864 PUT_SDB_INT_VAL (DBX_REGISTER_NUMBER (regno)); 865 PUT_SDB_SCL (C_REG); 866 } 867 else if (MEM_P (value) 868 && (MEM_P (XEXP (value, 0)) 869 || (REG_P (XEXP (value, 0)) 870 && REGNO (XEXP (value, 0)) != HARD_FRAME_POINTER_REGNUM 871 && REGNO (XEXP (value, 0)) != STACK_POINTER_REGNUM))) 872 /* If the value is indirect by memory or by a register 873 that isn't the frame pointer 874 then it means the object is variable-sized and address through 875 that register or stack slot. COFF has no way to represent this 876 so all we can do is output the variable as a pointer. */ 877 { 878 PUT_SDB_DEF (name); 879 if (REG_P (XEXP (value, 0))) 880 { 881 PUT_SDB_INT_VAL (DBX_REGISTER_NUMBER (REGNO (XEXP (value, 0)))); 882 PUT_SDB_SCL (C_REG); 883 } 884 else 885 { 886 /* DECL_RTL looks like (MEM (MEM (PLUS (REG...) 887 (CONST_INT...)))). 888 We want the value of that CONST_INT. */ 889 /* Encore compiler hates a newline in a macro arg, it seems. */ 890 PUT_SDB_INT_VAL (DEBUGGER_AUTO_OFFSET 891 (XEXP (XEXP (value, 0), 0))); 892 PUT_SDB_SCL (C_AUTO); 893 } 894 895 /* Effectively do build_pointer_type, but don't cache this type, 896 since it might be temporary whereas the type it points to 897 might have been saved for inlining. */ 898 /* Don't use REFERENCE_TYPE because dbx can't handle that. */ 899 type = make_node (POINTER_TYPE); 900 TREE_TYPE (type) = TREE_TYPE (decl); 901 } 902 else if (MEM_P (value) 903 && ((GET_CODE (XEXP (value, 0)) == PLUS 904 && REG_P (XEXP (XEXP (value, 0), 0)) 905 && CONST_INT_P (XEXP (XEXP (value, 0), 1))) 906 /* This is for variables which are at offset zero from 907 the frame pointer. This happens on the Alpha. 908 Non-frame pointer registers are excluded above. */ 909 || (REG_P (XEXP (value, 0))))) 910 { 911 /* DECL_RTL looks like (MEM (PLUS (REG...) (CONST_INT...))) 912 or (MEM (REG...)). We want the value of that CONST_INT 913 or zero. */ 914 PUT_SDB_DEF (name); 915 PUT_SDB_INT_VAL (DEBUGGER_AUTO_OFFSET (XEXP (value, 0))); 916 PUT_SDB_SCL (C_AUTO); 917 } 918 else 919 { 920 /* It is something we don't know how to represent for SDB. */ 921 return; 922 } 923 break; 924 925 default: 926 break; 927 } 928 PUT_SDB_TYPE (plain_type (type)); 929 PUT_SDB_ENDEF; 930 } 931 932 /* Output SDB information for a top-level initialized variable 933 that has been delayed. */ 934 935 static void 936 sdbout_toplevel_data (tree decl) 937 { 938 tree type = TREE_TYPE (decl); 939 940 if (DECL_IGNORED_P (decl)) 941 return; 942 943 gcc_assert (TREE_CODE (decl) == VAR_DECL); 944 gcc_assert (MEM_P (DECL_RTL (decl))); 945 gcc_assert (DECL_INITIAL (decl)); 946 947 PUT_SDB_DEF (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl))); 948 PUT_SDB_VAL (XEXP (DECL_RTL (decl), 0)); 949 if (TREE_PUBLIC (decl)) 950 { 951 PUT_SDB_SCL (C_EXT); 952 } 953 else 954 { 955 PUT_SDB_SCL (C_STAT); 956 } 957 PUT_SDB_TYPE (plain_type (type)); 958 PUT_SDB_ENDEF; 959 } 960 961 #ifdef SDB_ALLOW_FORWARD_REFERENCES 962 963 /* Machinery to record and output anonymous types. */ 964 965 static void 966 sdbout_queue_anonymous_type (tree type) 967 { 968 anonymous_types = tree_cons (NULL_TREE, type, anonymous_types); 969 } 970 971 static void 972 sdbout_dequeue_anonymous_types (void) 973 { 974 tree types, link; 975 976 while (anonymous_types) 977 { 978 types = nreverse (anonymous_types); 979 anonymous_types = NULL_TREE; 980 981 for (link = types; link; link = TREE_CHAIN (link)) 982 { 983 tree type = TREE_VALUE (link); 984 985 if (type && ! TREE_ASM_WRITTEN (type)) 986 sdbout_one_type (type); 987 } 988 } 989 } 990 991 #endif 992 993 /* Given a chain of ..._TYPE nodes, all of which have names, 994 output definitions of those names, as typedefs. */ 995 996 void 997 sdbout_types (tree types) 998 { 999 tree link; 1000 1001 for (link = types; link; link = TREE_CHAIN (link)) 1002 sdbout_one_type (link); 1003 1004 #ifdef SDB_ALLOW_FORWARD_REFERENCES 1005 sdbout_dequeue_anonymous_types (); 1006 #endif 1007 } 1008 1009 static void 1010 sdbout_type (tree type) 1011 { 1012 if (type == error_mark_node) 1013 type = integer_type_node; 1014 PUT_SDB_TYPE (plain_type (type)); 1015 } 1016 1017 /* Output types of the fields of type TYPE, if they are structs. 1018 1019 Formerly did not chase through pointer types, since that could be circular. 1020 They must come before TYPE, since forward refs are not allowed. 1021 Now james@bigtex.cactus.org says to try them. */ 1022 1023 static void 1024 sdbout_field_types (tree type) 1025 { 1026 tree tail; 1027 1028 for (tail = TYPE_FIELDS (type); tail; tail = TREE_CHAIN (tail)) 1029 /* This condition should match the one for emitting the actual 1030 members below. */ 1031 if (TREE_CODE (tail) == FIELD_DECL 1032 && DECL_NAME (tail) 1033 && DECL_SIZE (tail) 1034 && host_integerp (DECL_SIZE (tail), 1) 1035 && host_integerp (bit_position (tail), 0)) 1036 { 1037 if (POINTER_TYPE_P (TREE_TYPE (tail))) 1038 sdbout_one_type (TREE_TYPE (TREE_TYPE (tail))); 1039 else 1040 sdbout_one_type (TREE_TYPE (tail)); 1041 } 1042 } 1043 1044 /* Use this to put out the top level defined record and union types 1045 for later reference. If this is a struct with a name, then put that 1046 name out. Other unnamed structs will have .xxfake labels generated so 1047 that they may be referred to later. 1048 The label will be stored in the KNOWN_TYPE_TAG slot of a type. 1049 It may NOT be called recursively. */ 1050 1051 static void 1052 sdbout_one_type (tree type) 1053 { 1054 if (current_function_decl != NULL_TREE 1055 && DECL_SECTION_NAME (current_function_decl) != NULL_TREE) 1056 ; /* Don't change section amid function. */ 1057 else 1058 switch_to_section (text_section); 1059 1060 switch (TREE_CODE (type)) 1061 { 1062 case RECORD_TYPE: 1063 case UNION_TYPE: 1064 case QUAL_UNION_TYPE: 1065 case ENUMERAL_TYPE: 1066 type = TYPE_MAIN_VARIANT (type); 1067 /* Don't output a type twice. */ 1068 if (TREE_ASM_WRITTEN (type)) 1069 /* James said test TREE_ASM_BEING_WRITTEN here. */ 1070 return; 1071 1072 /* Output nothing if type is not yet defined. */ 1073 if (!COMPLETE_TYPE_P (type)) 1074 return; 1075 1076 TREE_ASM_WRITTEN (type) = 1; 1077 1078 /* This is reputed to cause trouble with the following case, 1079 but perhaps checking TYPE_SIZE above will fix it. */ 1080 1081 /* Here is a testcase: 1082 1083 struct foo { 1084 struct badstr *bbb; 1085 } forwardref; 1086 1087 typedef struct intermediate { 1088 int aaaa; 1089 } intermediate_ref; 1090 1091 typedef struct badstr { 1092 int ccccc; 1093 } badtype; */ 1094 1095 /* This change, which ought to make better output, 1096 used to make the COFF assembler unhappy. 1097 Changes involving KNOWN_TYPE_TAG may fix the problem. */ 1098 /* Before really doing anything, output types we want to refer to. */ 1099 /* Note that in version 1 the following two lines 1100 are not used if forward references are in use. */ 1101 if (TREE_CODE (type) != ENUMERAL_TYPE) 1102 sdbout_field_types (type); 1103 1104 /* Output a structure type. */ 1105 { 1106 int size = int_size_in_bytes (type); 1107 int member_scl = 0; 1108 tree tem; 1109 1110 /* Record the type tag, but not in its permanent place just yet. */ 1111 sdbout_record_type_name (type); 1112 1113 PUT_SDB_DEF (KNOWN_TYPE_TAG (type)); 1114 1115 switch (TREE_CODE (type)) 1116 { 1117 case UNION_TYPE: 1118 case QUAL_UNION_TYPE: 1119 PUT_SDB_SCL (C_UNTAG); 1120 PUT_SDB_TYPE (T_UNION); 1121 member_scl = C_MOU; 1122 break; 1123 1124 case RECORD_TYPE: 1125 PUT_SDB_SCL (C_STRTAG); 1126 PUT_SDB_TYPE (T_STRUCT); 1127 member_scl = C_MOS; 1128 break; 1129 1130 case ENUMERAL_TYPE: 1131 PUT_SDB_SCL (C_ENTAG); 1132 PUT_SDB_TYPE (T_ENUM); 1133 member_scl = C_MOE; 1134 break; 1135 1136 default: 1137 break; 1138 } 1139 1140 PUT_SDB_SIZE (size); 1141 PUT_SDB_ENDEF; 1142 1143 /* Print out the base class information with fields 1144 named after the types they hold. */ 1145 /* This is only relevant to aggregate types. TYPE_BINFO is used 1146 for other purposes in an ENUMERAL_TYPE, so we must exclude that 1147 case. */ 1148 if (TREE_CODE (type) != ENUMERAL_TYPE && TYPE_BINFO (type)) 1149 { 1150 int i; 1151 tree binfo, child; 1152 1153 for (binfo = TYPE_BINFO (type), i = 0; 1154 BINFO_BASE_ITERATE (binfo, i, child); i++) 1155 { 1156 tree child_type = BINFO_TYPE (child); 1157 tree child_type_name; 1158 1159 if (TYPE_NAME (child_type) == 0) 1160 continue; 1161 if (TREE_CODE (TYPE_NAME (child_type)) == IDENTIFIER_NODE) 1162 child_type_name = TYPE_NAME (child_type); 1163 else if (TREE_CODE (TYPE_NAME (child_type)) == TYPE_DECL) 1164 { 1165 child_type_name = DECL_NAME (TYPE_NAME (child_type)); 1166 if (child_type_name && template_name_p (child_type_name)) 1167 child_type_name 1168 = DECL_ASSEMBLER_NAME (TYPE_NAME (child_type)); 1169 } 1170 else 1171 continue; 1172 1173 PUT_SDB_DEF (IDENTIFIER_POINTER (child_type_name)); 1174 PUT_SDB_INT_VAL (tree_low_cst (BINFO_OFFSET (child), 0)); 1175 PUT_SDB_SCL (member_scl); 1176 sdbout_type (BINFO_TYPE (child)); 1177 PUT_SDB_ENDEF; 1178 } 1179 } 1180 1181 /* Output the individual fields. */ 1182 1183 if (TREE_CODE (type) == ENUMERAL_TYPE) 1184 { 1185 for (tem = TYPE_VALUES (type); tem; tem = TREE_CHAIN (tem)) 1186 { 1187 tree value = TREE_VALUE (tem); 1188 1189 if (TREE_CODE (value) == CONST_DECL) 1190 value = DECL_INITIAL (value); 1191 1192 if (host_integerp (value, 0)) 1193 { 1194 PUT_SDB_DEF (IDENTIFIER_POINTER (TREE_PURPOSE (tem))); 1195 PUT_SDB_INT_VAL (tree_low_cst (value, 0)); 1196 PUT_SDB_SCL (C_MOE); 1197 PUT_SDB_TYPE (T_MOE); 1198 PUT_SDB_ENDEF; 1199 } 1200 } 1201 } 1202 else /* record or union type */ 1203 for (tem = TYPE_FIELDS (type); tem; tem = TREE_CHAIN (tem)) 1204 /* Output the name, type, position (in bits), size (in bits) 1205 of each field. */ 1206 1207 /* Omit here the nameless fields that are used to skip bits. 1208 Also omit fields with variable size or position. 1209 Also omit non FIELD_DECL nodes that GNU C++ may put here. */ 1210 if (TREE_CODE (tem) == FIELD_DECL 1211 && DECL_NAME (tem) 1212 && DECL_SIZE (tem) 1213 && host_integerp (DECL_SIZE (tem), 1) 1214 && host_integerp (bit_position (tem), 0)) 1215 { 1216 const char *name; 1217 1218 name = IDENTIFIER_POINTER (DECL_NAME (tem)); 1219 PUT_SDB_DEF (name); 1220 if (DECL_BIT_FIELD_TYPE (tem)) 1221 { 1222 PUT_SDB_INT_VAL (int_bit_position (tem)); 1223 PUT_SDB_SCL (C_FIELD); 1224 sdbout_type (DECL_BIT_FIELD_TYPE (tem)); 1225 PUT_SDB_SIZE (tree_low_cst (DECL_SIZE (tem), 1)); 1226 } 1227 else 1228 { 1229 PUT_SDB_INT_VAL (int_bit_position (tem) / BITS_PER_UNIT); 1230 PUT_SDB_SCL (member_scl); 1231 sdbout_type (TREE_TYPE (tem)); 1232 } 1233 PUT_SDB_ENDEF; 1234 } 1235 /* Output end of a structure,union, or enumeral definition. */ 1236 1237 PUT_SDB_PLAIN_DEF ("eos"); 1238 PUT_SDB_INT_VAL (size); 1239 PUT_SDB_SCL (C_EOS); 1240 PUT_SDB_TAG (KNOWN_TYPE_TAG (type)); 1241 PUT_SDB_SIZE (size); 1242 PUT_SDB_ENDEF; 1243 break; 1244 } 1245 1246 default: 1247 break; 1248 } 1249 } 1250 1251 /* The following two functions output definitions of function parameters. 1252 Each parameter gets a definition locating it in the parameter list. 1253 Each parameter that is a register variable gets a second definition 1254 locating it in the register. 1255 1256 Printing or argument lists in gdb uses the definitions that 1257 locate in the parameter list. But reference to the variable in 1258 expressions uses preferentially the definition as a register. */ 1259 1260 /* Output definitions, referring to storage in the parmlist, 1261 of all the parms in PARMS, which is a chain of PARM_DECL nodes. */ 1262 1263 static void 1264 sdbout_parms (tree parms) 1265 { 1266 for (; parms; parms = TREE_CHAIN (parms)) 1267 if (DECL_NAME (parms) 1268 && TREE_TYPE (parms) != error_mark_node 1269 && DECL_RTL_SET_P (parms) 1270 && DECL_INCOMING_RTL (parms)) 1271 { 1272 int current_sym_value = 0; 1273 const char *name = IDENTIFIER_POINTER (DECL_NAME (parms)); 1274 1275 if (name == 0 || *name == 0) 1276 name = gen_fake_label (); 1277 1278 /* Perform any necessary register eliminations on the parameter's rtl, 1279 so that the debugging output will be accurate. */ 1280 DECL_INCOMING_RTL (parms) 1281 = eliminate_regs (DECL_INCOMING_RTL (parms), VOIDmode, NULL_RTX); 1282 SET_DECL_RTL (parms, 1283 eliminate_regs (DECL_RTL (parms), VOIDmode, NULL_RTX)); 1284 1285 if (PARM_PASSED_IN_MEMORY (parms)) 1286 { 1287 rtx addr = XEXP (DECL_INCOMING_RTL (parms), 0); 1288 tree type; 1289 1290 /* ??? Here we assume that the parm address is indexed 1291 off the frame pointer or arg pointer. 1292 If that is not true, we produce meaningless results, 1293 but do not crash. */ 1294 if (GET_CODE (addr) == PLUS 1295 && CONST_INT_P (XEXP (addr, 1))) 1296 current_sym_value = INTVAL (XEXP (addr, 1)); 1297 else 1298 current_sym_value = 0; 1299 1300 if (REG_P (DECL_RTL (parms)) 1301 && REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER) 1302 type = DECL_ARG_TYPE (parms); 1303 else 1304 { 1305 int original_sym_value = current_sym_value; 1306 1307 /* This is the case where the parm is passed as an int or 1308 double and it is converted to a char, short or float 1309 and stored back in the parmlist. In this case, describe 1310 the parm with the variable's declared type, and adjust 1311 the address if the least significant bytes (which we are 1312 using) are not the first ones. */ 1313 if (BYTES_BIG_ENDIAN 1314 && TREE_TYPE (parms) != DECL_ARG_TYPE (parms)) 1315 current_sym_value += 1316 (GET_MODE_SIZE (TYPE_MODE (DECL_ARG_TYPE (parms))) 1317 - GET_MODE_SIZE (GET_MODE (DECL_RTL (parms)))); 1318 1319 if (MEM_P (DECL_RTL (parms)) 1320 && GET_CODE (XEXP (DECL_RTL (parms), 0)) == PLUS 1321 && (GET_CODE (XEXP (XEXP (DECL_RTL (parms), 0), 1)) 1322 == CONST_INT) 1323 && (INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1)) 1324 == current_sym_value)) 1325 type = TREE_TYPE (parms); 1326 else 1327 { 1328 current_sym_value = original_sym_value; 1329 type = DECL_ARG_TYPE (parms); 1330 } 1331 } 1332 1333 PUT_SDB_DEF (name); 1334 PUT_SDB_INT_VAL (DEBUGGER_ARG_OFFSET (current_sym_value, addr)); 1335 PUT_SDB_SCL (C_ARG); 1336 PUT_SDB_TYPE (plain_type (type)); 1337 PUT_SDB_ENDEF; 1338 } 1339 else if (REG_P (DECL_RTL (parms))) 1340 { 1341 rtx best_rtl; 1342 /* Parm passed in registers and lives in registers or nowhere. */ 1343 1344 /* If parm lives in a register, use that register; 1345 pretend the parm was passed there. It would be more consistent 1346 to describe the register where the parm was passed, 1347 but in practice that register usually holds something else. */ 1348 if (REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER) 1349 best_rtl = DECL_RTL (parms); 1350 /* If the parm lives nowhere, 1351 use the register where it was passed. */ 1352 else 1353 best_rtl = DECL_INCOMING_RTL (parms); 1354 1355 PUT_SDB_DEF (name); 1356 PUT_SDB_INT_VAL (DBX_REGISTER_NUMBER (REGNO (best_rtl))); 1357 PUT_SDB_SCL (C_REGPARM); 1358 PUT_SDB_TYPE (plain_type (TREE_TYPE (parms))); 1359 PUT_SDB_ENDEF; 1360 } 1361 else if (MEM_P (DECL_RTL (parms)) 1362 && XEXP (DECL_RTL (parms), 0) != const0_rtx) 1363 { 1364 /* Parm was passed in registers but lives on the stack. */ 1365 1366 /* DECL_RTL looks like (MEM (PLUS (REG...) (CONST_INT...))), 1367 in which case we want the value of that CONST_INT, 1368 or (MEM (REG ...)) or (MEM (MEM ...)), 1369 in which case we use a value of zero. */ 1370 if (REG_P (XEXP (DECL_RTL (parms), 0)) 1371 || MEM_P (XEXP (DECL_RTL (parms), 0))) 1372 current_sym_value = 0; 1373 else 1374 current_sym_value = INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1)); 1375 1376 /* Again, this assumes the offset is based on the arg pointer. */ 1377 PUT_SDB_DEF (name); 1378 PUT_SDB_INT_VAL (DEBUGGER_ARG_OFFSET (current_sym_value, 1379 XEXP (DECL_RTL (parms), 0))); 1380 PUT_SDB_SCL (C_ARG); 1381 PUT_SDB_TYPE (plain_type (TREE_TYPE (parms))); 1382 PUT_SDB_ENDEF; 1383 } 1384 } 1385 } 1386 1387 /* Output definitions for the places where parms live during the function, 1388 when different from where they were passed, when the parms were passed 1389 in memory. 1390 1391 It is not useful to do this for parms passed in registers 1392 that live during the function in different registers, because it is 1393 impossible to look in the passed register for the passed value, 1394 so we use the within-the-function register to begin with. 1395 1396 PARMS is a chain of PARM_DECL nodes. */ 1397 1398 static void 1399 sdbout_reg_parms (tree parms) 1400 { 1401 for (; parms; parms = TREE_CHAIN (parms)) 1402 if (DECL_NAME (parms) 1403 && TREE_TYPE (parms) != error_mark_node 1404 && DECL_RTL_SET_P (parms) 1405 && DECL_INCOMING_RTL (parms)) 1406 { 1407 const char *name = IDENTIFIER_POINTER (DECL_NAME (parms)); 1408 1409 /* Report parms that live in registers during the function 1410 but were passed in memory. */ 1411 if (REG_P (DECL_RTL (parms)) 1412 && REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER 1413 && PARM_PASSED_IN_MEMORY (parms)) 1414 { 1415 if (name == 0 || *name == 0) 1416 name = gen_fake_label (); 1417 PUT_SDB_DEF (name); 1418 PUT_SDB_INT_VAL (DBX_REGISTER_NUMBER (REGNO (DECL_RTL (parms)))); 1419 PUT_SDB_SCL (C_REG); 1420 PUT_SDB_TYPE (plain_type (TREE_TYPE (parms))); 1421 PUT_SDB_ENDEF; 1422 } 1423 /* Report parms that live in memory but not where they were passed. */ 1424 else if (MEM_P (DECL_RTL (parms)) 1425 && GET_CODE (XEXP (DECL_RTL (parms), 0)) == PLUS 1426 && CONST_INT_P (XEXP (XEXP (DECL_RTL (parms), 0), 1)) 1427 && PARM_PASSED_IN_MEMORY (parms) 1428 && ! rtx_equal_p (DECL_RTL (parms), DECL_INCOMING_RTL (parms))) 1429 { 1430 #if 0 /* ??? It is not clear yet what should replace this. */ 1431 int offset = DECL_OFFSET (parms) / BITS_PER_UNIT; 1432 /* A parm declared char is really passed as an int, 1433 so it occupies the least significant bytes. 1434 On a big-endian machine those are not the low-numbered ones. */ 1435 if (BYTES_BIG_ENDIAN 1436 && offset != -1 1437 && TREE_TYPE (parms) != DECL_ARG_TYPE (parms)) 1438 offset += (GET_MODE_SIZE (TYPE_MODE (DECL_ARG_TYPE (parms))) 1439 - GET_MODE_SIZE (GET_MODE (DECL_RTL (parms)))); 1440 if (INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1)) != offset) {...} 1441 #endif 1442 { 1443 if (name == 0 || *name == 0) 1444 name = gen_fake_label (); 1445 PUT_SDB_DEF (name); 1446 PUT_SDB_INT_VAL (DEBUGGER_AUTO_OFFSET 1447 (XEXP (DECL_RTL (parms), 0))); 1448 PUT_SDB_SCL (C_AUTO); 1449 PUT_SDB_TYPE (plain_type (TREE_TYPE (parms))); 1450 PUT_SDB_ENDEF; 1451 } 1452 } 1453 } 1454 } 1455 1456 /* Output debug information for a global DECL. Called from toplev.c 1457 after compilation proper has finished. */ 1458 1459 static void 1460 sdbout_global_decl (tree decl) 1461 { 1462 if (TREE_CODE (decl) == VAR_DECL 1463 && !DECL_EXTERNAL (decl) 1464 && DECL_RTL_SET_P (decl)) 1465 { 1466 /* The COFF linker can move initialized global vars to the end. 1467 And that can screw up the symbol ordering. Defer those for 1468 sdbout_finish (). */ 1469 if (!DECL_INITIAL (decl) || !TREE_PUBLIC (decl)) 1470 sdbout_symbol (decl, 0); 1471 else 1472 VEC_safe_push (tree, gc, deferred_global_decls, decl); 1473 1474 /* Output COFF information for non-global file-scope initialized 1475 variables. */ 1476 if (DECL_INITIAL (decl) && MEM_P (DECL_RTL (decl))) 1477 sdbout_toplevel_data (decl); 1478 } 1479 } 1480 1481 /* Output initialized global vars at the end, in the order of 1482 definition. See comment in sdbout_global_decl. */ 1483 1484 static void 1485 sdbout_finish (const char *main_filename ATTRIBUTE_UNUSED) 1486 { 1487 size_t i; 1488 tree decl; 1489 1490 FOR_EACH_VEC_ELT (tree, deferred_global_decls, i, decl) 1491 sdbout_symbol (decl, 0); 1492 } 1493 1494 /* Describe the beginning of an internal block within a function. 1495 Also output descriptions of variables defined in this block. 1496 1497 N is the number of the block, by order of beginning, counting from 1, 1498 and not counting the outermost (function top-level) block. 1499 The blocks match the BLOCKs in DECL_INITIAL (current_function_decl), 1500 if the count starts at 0 for the outermost one. */ 1501 1502 static void 1503 sdbout_begin_block (unsigned int line, unsigned int n) 1504 { 1505 tree decl = current_function_decl; 1506 MAKE_LINE_SAFE (line); 1507 1508 /* The SCO compiler does not emit a separate block for the function level 1509 scope, so we avoid it here also. However, mips ECOFF compilers do emit 1510 a separate block, so we retain it when MIPS_DEBUGGING_INFO is defined. */ 1511 #ifndef MIPS_DEBUGGING_INFO 1512 if (n != 1) 1513 #endif 1514 PUT_SDB_BLOCK_START (line - sdb_begin_function_line); 1515 1516 if (n == 1) 1517 { 1518 /* Include the outermost BLOCK's variables in block 1. */ 1519 do_block = BLOCK_NUMBER (DECL_INITIAL (decl)); 1520 sdbout_block (DECL_INITIAL (decl)); 1521 } 1522 /* If -g1, suppress all the internal symbols of functions 1523 except for arguments. */ 1524 if (debug_info_level != DINFO_LEVEL_TERSE) 1525 { 1526 do_block = n; 1527 sdbout_block (DECL_INITIAL (decl)); 1528 } 1529 1530 #ifdef SDB_ALLOW_FORWARD_REFERENCES 1531 sdbout_dequeue_anonymous_types (); 1532 #endif 1533 } 1534 1535 /* Describe the end line-number of an internal block within a function. */ 1536 1537 static void 1538 sdbout_end_block (unsigned int line, unsigned int n ATTRIBUTE_UNUSED) 1539 { 1540 MAKE_LINE_SAFE (line); 1541 1542 /* The SCO compiler does not emit a separate block for the function level 1543 scope, so we avoid it here also. However, mips ECOFF compilers do emit 1544 a separate block, so we retain it when MIPS_DEBUGGING_INFO is defined. */ 1545 #ifndef MIPS_DEBUGGING_INFO 1546 if (n != 1) 1547 #endif 1548 PUT_SDB_BLOCK_END (line - sdb_begin_function_line); 1549 } 1550 1551 /* Output a line number symbol entry for source file FILENAME and line 1552 number LINE. */ 1553 1554 static void 1555 sdbout_source_line (unsigned int line, const char *filename ATTRIBUTE_UNUSED, 1556 int discriminator ATTRIBUTE_UNUSED, 1557 bool is_stmt ATTRIBUTE_UNUSED) 1558 { 1559 /* COFF relative line numbers must be positive. */ 1560 if ((int) line > sdb_begin_function_line) 1561 { 1562 #ifdef SDB_OUTPUT_SOURCE_LINE 1563 SDB_OUTPUT_SOURCE_LINE (asm_out_file, line); 1564 #else 1565 fprintf (asm_out_file, "\t.ln\t%d\n", 1566 ((sdb_begin_function_line > -1) 1567 ? line - sdb_begin_function_line : 1)); 1568 #endif 1569 } 1570 } 1571 1572 /* Output sdb info for the current function name. 1573 Called from assemble_start_function. */ 1574 1575 static void 1576 sdbout_begin_function (tree decl ATTRIBUTE_UNUSED) 1577 { 1578 sdbout_symbol (current_function_decl, 0); 1579 } 1580 1581 /* Called at beginning of function body (before or after prologue, 1582 depending on MIPS_DEBUGGING_INFO). Record the function's starting 1583 line number, so we can output relative line numbers for the other 1584 lines. Describe beginning of outermost block. Also describe the 1585 parameter list. */ 1586 1587 #ifndef MIPS_DEBUGGING_INFO 1588 static void 1589 sdbout_begin_prologue (unsigned int line, const char *file ATTRIBUTE_UNUSED) 1590 { 1591 sdbout_end_prologue (line, file); 1592 } 1593 #endif 1594 1595 static void 1596 sdbout_end_prologue (unsigned int line, const char *file ATTRIBUTE_UNUSED) 1597 { 1598 sdb_begin_function_line = line - 1; 1599 PUT_SDB_FUNCTION_START (line); 1600 sdbout_parms (DECL_ARGUMENTS (current_function_decl)); 1601 sdbout_reg_parms (DECL_ARGUMENTS (current_function_decl)); 1602 } 1603 1604 /* Called at end of function (before epilogue). 1605 Describe end of outermost block. */ 1606 1607 static void 1608 sdbout_end_function (unsigned int line) 1609 { 1610 #ifdef SDB_ALLOW_FORWARD_REFERENCES 1611 sdbout_dequeue_anonymous_types (); 1612 #endif 1613 1614 MAKE_LINE_SAFE (line); 1615 PUT_SDB_FUNCTION_END (line - sdb_begin_function_line); 1616 1617 /* Indicate we are between functions, for line-number output. */ 1618 sdb_begin_function_line = -1; 1619 } 1620 1621 /* Output sdb info for the absolute end of a function. 1622 Called after the epilogue is output. */ 1623 1624 static void 1625 sdbout_end_epilogue (unsigned int line ATTRIBUTE_UNUSED, 1626 const char *file ATTRIBUTE_UNUSED) 1627 { 1628 const char *const name ATTRIBUTE_UNUSED 1629 = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl)); 1630 1631 #ifdef PUT_SDB_EPILOGUE_END 1632 PUT_SDB_EPILOGUE_END (name); 1633 #else 1634 fprintf (asm_out_file, "\t.def\t"); 1635 assemble_name (asm_out_file, name); 1636 fprintf (asm_out_file, "%s\t.val\t.%s\t.scl\t-1%s\t.endef\n", 1637 SDB_DELIM, SDB_DELIM, SDB_DELIM); 1638 #endif 1639 } 1640 1641 /* Output sdb info for the given label. Called only if LABEL_NAME (insn) 1642 is present. */ 1643 1644 static void 1645 sdbout_label (rtx insn) 1646 { 1647 PUT_SDB_DEF (LABEL_NAME (insn)); 1648 PUT_SDB_VAL (insn); 1649 PUT_SDB_SCL (C_LABEL); 1650 PUT_SDB_TYPE (T_NULL); 1651 PUT_SDB_ENDEF; 1652 } 1653 1654 /* Change to reading from a new source file. */ 1655 1656 static void 1657 sdbout_start_source_file (unsigned int line ATTRIBUTE_UNUSED, 1658 const char *filename ATTRIBUTE_UNUSED) 1659 { 1660 #ifdef MIPS_DEBUGGING_INFO 1661 struct sdb_file *n = XNEW (struct sdb_file); 1662 1663 n->next = current_file; 1664 n->name = filename; 1665 current_file = n; 1666 output_file_directive (asm_out_file, filename); 1667 #endif 1668 } 1669 1670 /* Revert to reading a previous source file. */ 1671 1672 static void 1673 sdbout_end_source_file (unsigned int line ATTRIBUTE_UNUSED) 1674 { 1675 #ifdef MIPS_DEBUGGING_INFO 1676 struct sdb_file *next; 1677 1678 next = current_file->next; 1679 free (current_file); 1680 current_file = next; 1681 output_file_directive (asm_out_file, current_file->name); 1682 #endif 1683 } 1684 1685 /* Set up for SDB output at the start of compilation. */ 1686 1687 static void 1688 sdbout_init (const char *input_file_name ATTRIBUTE_UNUSED) 1689 { 1690 tree t; 1691 1692 #ifdef MIPS_DEBUGGING_INFO 1693 current_file = XNEW (struct sdb_file); 1694 current_file->next = NULL; 1695 current_file->name = input_file_name; 1696 #endif 1697 1698 deferred_global_decls = VEC_alloc (tree, gc, 12); 1699 1700 /* Emit debug information which was queued by sdbout_symbol before 1701 we got here. */ 1702 sdbout_initialized = true; 1703 1704 for (t = nreverse (preinit_symbols); t; t = TREE_CHAIN (t)) 1705 sdbout_symbol (TREE_VALUE (t), 0); 1706 preinit_symbols = 0; 1707 } 1708 1709 #endif /* SDB_DEBUGGING_INFO */ 1710 1711 #include "gt-sdbout.h" 1712