1/* Output sdb-format symbol table information from GNU compiler. 2 Copyright (C) 1988, 92-97, 1998 Free Software Foundation, Inc. 3 4This file is part of GNU CC. 5 6GNU CC is free software; you can redistribute it and/or modify 7it under the terms of the GNU General Public License as published by 8the Free Software Foundation; either version 2, or (at your option) 9any later version. 10 11GNU CC is distributed in the hope that it will be useful, 12but WITHOUT ANY WARRANTY; without even the implied warranty of 13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14GNU General Public License for more details. 15 16You should have received a copy of the GNU General Public License 17along with GNU CC; see the file COPYING. If not, write to 18the Free Software Foundation, 59 Temple Place - Suite 330, 19Boston, MA 02111-1307, USA. */ 20 21/* mike@tredysvr.Tredydev.Unisys.COM says: 22I modified the struct.c example and have a nm of a .o resulting from the 23AT&T C compiler. From the example below I would conclude the following: 24 251. All .defs from structures are emitted as scanned. The example below 26 clearly shows the symbol table entries for BoxRec2 are after the first 27 function. 28 292. All functions and their locals (including statics) are emitted as scanned. 30 313. All nested unnamed union and structure .defs must be emitted before 32 the structure in which they are nested. The AT&T assembler is a 33 one pass beast as far as symbolics are concerned. 34 354. All structure .defs are emitted before the typedefs that refer to them. 36 375. All top level static and external variable definitions are moved to the 38 end of file with all top level statics occurring first before externs. 39 406. All undefined references are at the end of the file. 41*/ 42 43#include "config.h" 44 45#ifdef SDB_DEBUGGING_INFO 46 47#include "system.h" 48#include "tree.h" 49#include "rtl.h" 50#include "regs.h" 51#include "defaults.h" 52#include "flags.h" 53#include "insn-config.h" 54#include "reload.h" 55#include "output.h" 56#include "toplev.h" 57 58/* Mips systems use the SDB functions to dump out symbols, but do not 59 supply usable syms.h include files. Which syms.h file to use is a 60 target parameter so don't use the native one if we're cross compiling. */ 61 62#if defined(USG) && !defined(MIPS) && !defined (hpux) && !defined(_WIN32) && !defined(__linux__) && !defined(__INTERIX) && !defined(CROSS_COMPILE) 63#include <syms.h> 64/* Use T_INT if we don't have T_VOID. */ 65#ifndef T_VOID 66#define T_VOID T_INT 67#endif 68#else 69#include "gsyms.h" 70#endif 71 72/* #include <storclass.h> used to be this instead of syms.h. */ 73 74/* 1 if PARM is passed to this function in memory. */ 75 76#define PARM_PASSED_IN_MEMORY(PARM) \ 77 (GET_CODE (DECL_INCOMING_RTL (PARM)) == MEM) 78 79/* A C expression for the integer offset value of an automatic variable 80 (C_AUTO) having address X (an RTX). */ 81#ifndef DEBUGGER_AUTO_OFFSET 82#define DEBUGGER_AUTO_OFFSET(X) \ 83 (GET_CODE (X) == PLUS ? INTVAL (XEXP (X, 1)) : 0) 84#endif 85 86/* A C expression for the integer offset value of an argument (C_ARG) 87 having address X (an RTX). The nominal offset is OFFSET. */ 88#ifndef DEBUGGER_ARG_OFFSET 89#define DEBUGGER_ARG_OFFSET(OFFSET, X) (OFFSET) 90#endif 91 92/* Line number of beginning of current function, minus one. 93 Negative means not in a function or not using sdb. */ 94 95int sdb_begin_function_line = -1; 96 97/* Counter to generate unique "names" for nameless struct members. */ 98 99static int unnamed_struct_number = 0; 100 101extern FILE *asm_out_file; 102 103extern tree current_function_decl; 104 105#include "sdbout.h" 106 107static char *gen_fake_label PROTO((void)); 108static int plain_type PROTO((tree)); 109static int template_name_p PROTO((tree)); 110static void sdbout_record_type_name PROTO((tree)); 111static int plain_type_1 PROTO((tree, int)); 112static void sdbout_block PROTO((tree)); 113static void sdbout_syms PROTO((tree)); 114static void sdbout_queue_anonymous_type PROTO((tree)); 115static void sdbout_dequeue_anonymous_types PROTO((void)); 116static void sdbout_type PROTO((tree)); 117static void sdbout_field_types PROTO((tree)); 118static void sdbout_one_type PROTO((tree)); 119static void sdbout_parms PROTO((tree)); 120static void sdbout_reg_parms PROTO((tree)); 121 122/* Define the default sizes for various types. */ 123 124#ifndef CHAR_TYPE_SIZE 125#define CHAR_TYPE_SIZE BITS_PER_UNIT 126#endif 127 128#ifndef SHORT_TYPE_SIZE 129#define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2)) 130#endif 131 132#ifndef INT_TYPE_SIZE 133#define INT_TYPE_SIZE BITS_PER_WORD 134#endif 135 136#ifndef LONG_TYPE_SIZE 137#define LONG_TYPE_SIZE BITS_PER_WORD 138#endif 139 140#ifndef LONG_LONG_TYPE_SIZE 141#define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2) 142#endif 143 144#ifndef FLOAT_TYPE_SIZE 145#define FLOAT_TYPE_SIZE BITS_PER_WORD 146#endif 147 148#ifndef DOUBLE_TYPE_SIZE 149#define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2) 150#endif 151 152#ifndef LONG_DOUBLE_TYPE_SIZE 153#define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2) 154#endif 155 156/* Random macros describing parts of SDB data. */ 157 158/* Put something here if lines get too long */ 159#define CONTIN 160 161/* Default value of delimiter is ";". */ 162#ifndef SDB_DELIM 163#define SDB_DELIM ";" 164#endif 165 166/* Maximum number of dimensions the assembler will allow. */ 167#ifndef SDB_MAX_DIM 168#define SDB_MAX_DIM 4 169#endif 170 171#ifndef PUT_SDB_SCL 172#define PUT_SDB_SCL(a) fprintf(asm_out_file, "\t.scl\t%d%s", (a), SDB_DELIM) 173#endif 174 175#ifndef PUT_SDB_INT_VAL 176#define PUT_SDB_INT_VAL(a) \ 177 do { \ 178 fputs ("\t.val\t", asm_out_file); \ 179 fprintf (asm_out_file, HOST_WIDE_INT_PRINT_DEC, (HOST_WIDE_INT)(a)); \ 180 fprintf (asm_out_file, "%s", SDB_DELIM); \ 181 } while (0) 182 183#endif 184 185#ifndef PUT_SDB_VAL 186#define PUT_SDB_VAL(a) \ 187( fputs ("\t.val\t", asm_out_file), \ 188 output_addr_const (asm_out_file, (a)), \ 189 fprintf (asm_out_file, SDB_DELIM)) 190#endif 191 192#ifndef PUT_SDB_DEF 193#define PUT_SDB_DEF(a) \ 194do { fprintf (asm_out_file, "\t.def\t"); \ 195 ASM_OUTPUT_LABELREF (asm_out_file, a); \ 196 fprintf (asm_out_file, SDB_DELIM); } while (0) 197#endif 198 199#ifndef PUT_SDB_PLAIN_DEF 200#define PUT_SDB_PLAIN_DEF(a) fprintf(asm_out_file,"\t.def\t.%s%s",a, SDB_DELIM) 201#endif 202 203#ifndef PUT_SDB_ENDEF 204#define PUT_SDB_ENDEF fputs("\t.endef\n", asm_out_file) 205#endif 206 207#ifndef PUT_SDB_TYPE 208#define PUT_SDB_TYPE(a) fprintf(asm_out_file, "\t.type\t0%o%s", a, SDB_DELIM) 209#endif 210 211#ifndef PUT_SDB_SIZE 212#define PUT_SDB_SIZE(a) \ 213 do { \ 214 fputs ("\t.size\t", asm_out_file); \ 215 fprintf (asm_out_file, HOST_WIDE_INT_PRINT_DEC, (HOST_WIDE_INT)(a)); \ 216 fprintf (asm_out_file, "%s", SDB_DELIM); \ 217 } while(0) 218#endif 219 220#ifndef PUT_SDB_START_DIM 221#define PUT_SDB_START_DIM fprintf(asm_out_file, "\t.dim\t") 222#endif 223 224#ifndef PUT_SDB_NEXT_DIM 225#define PUT_SDB_NEXT_DIM(a) fprintf(asm_out_file, "%d,", a) 226#endif 227 228#ifndef PUT_SDB_LAST_DIM 229#define PUT_SDB_LAST_DIM(a) fprintf(asm_out_file, "%d%s", a, SDB_DELIM) 230#endif 231 232#ifndef PUT_SDB_TAG 233#define PUT_SDB_TAG(a) \ 234do { fprintf (asm_out_file, "\t.tag\t"); \ 235 ASM_OUTPUT_LABELREF (asm_out_file, a); \ 236 fprintf (asm_out_file, SDB_DELIM); } while (0) 237#endif 238 239#ifndef PUT_SDB_BLOCK_START 240#define PUT_SDB_BLOCK_START(LINE) \ 241 fprintf (asm_out_file, \ 242 "\t.def\t.bb%s\t.val\t.%s\t.scl\t100%s\t.line\t%d%s\t.endef\n", \ 243 SDB_DELIM, SDB_DELIM, SDB_DELIM, (LINE), SDB_DELIM) 244#endif 245 246#ifndef PUT_SDB_BLOCK_END 247#define PUT_SDB_BLOCK_END(LINE) \ 248 fprintf (asm_out_file, \ 249 "\t.def\t.eb%s\t.val\t.%s\t.scl\t100%s\t.line\t%d%s\t.endef\n", \ 250 SDB_DELIM, SDB_DELIM, SDB_DELIM, (LINE), SDB_DELIM) 251#endif 252 253#ifndef PUT_SDB_FUNCTION_START 254#define PUT_SDB_FUNCTION_START(LINE) \ 255 fprintf (asm_out_file, \ 256 "\t.def\t.bf%s\t.val\t.%s\t.scl\t101%s\t.line\t%d%s\t.endef\n", \ 257 SDB_DELIM, SDB_DELIM, SDB_DELIM, (LINE), SDB_DELIM) 258#endif 259 260#ifndef PUT_SDB_FUNCTION_END 261#define PUT_SDB_FUNCTION_END(LINE) \ 262 fprintf (asm_out_file, \ 263 "\t.def\t.ef%s\t.val\t.%s\t.scl\t101%s\t.line\t%d%s\t.endef\n", \ 264 SDB_DELIM, SDB_DELIM, SDB_DELIM, (LINE), SDB_DELIM) 265#endif 266 267#ifndef PUT_SDB_EPILOGUE_END 268#define PUT_SDB_EPILOGUE_END(NAME) \ 269do { fprintf (asm_out_file, "\t.def\t"); \ 270 ASM_OUTPUT_LABELREF (asm_out_file, NAME); \ 271 fprintf (asm_out_file, \ 272 "%s\t.val\t.%s\t.scl\t-1%s\t.endef\n", \ 273 SDB_DELIM, SDB_DELIM, SDB_DELIM); } while (0) 274#endif 275 276#ifndef SDB_GENERATE_FAKE 277#define SDB_GENERATE_FAKE(BUFFER, NUMBER) \ 278 sprintf ((BUFFER), ".%dfake", (NUMBER)); 279#endif 280 281/* Return the sdb tag identifier string for TYPE 282 if TYPE has already been defined; otherwise return a null pointer. */ 283 284#define KNOWN_TYPE_TAG(type) TYPE_SYMTAB_POINTER (type) 285 286/* Set the sdb tag identifier string for TYPE to NAME. */ 287 288#define SET_KNOWN_TYPE_TAG(TYPE, NAME) \ 289 TYPE_SYMTAB_POINTER (TYPE) = (NAME) 290 291/* Return the name (a string) of the struct, union or enum tag 292 described by the TREE_LIST node LINK. This is 0 for an anonymous one. */ 293 294#define TAG_NAME(link) \ 295 (((link) && TREE_PURPOSE ((link)) \ 296 && IDENTIFIER_POINTER (TREE_PURPOSE ((link)))) \ 297 ? IDENTIFIER_POINTER (TREE_PURPOSE ((link))) : (char *) 0) 298 299/* Ensure we don't output a negative line number. */ 300#define MAKE_LINE_SAFE(line) \ 301 if (line <= sdb_begin_function_line) line = sdb_begin_function_line + 1 302 303/* Perform linker optimization of merging header file definitions together 304 for targets with MIPS_DEBUGGING_INFO defined. This won't work without a 305 post 960826 version of GAS. Nothing breaks with earlier versions of GAS, 306 the optimization just won't be done. The native assembler already has the 307 necessary support. */ 308 309#ifdef MIPS_DEBUGGING_INFO 310 311#ifndef PUT_SDB_SRC_FILE 312#define PUT_SDB_SRC_FILE(FILENAME) \ 313output_file_directive (asm_out_file, (FILENAME)) 314#endif 315 316/* ECOFF linkers have an optimization that does the same kind of thing as 317 N_BINCL/E_INCL in stabs: eliminate duplicate debug information in the 318 executable. To achieve this, GCC must output a .file for each file 319 name change. */ 320 321/* This is a stack of input files. */ 322 323struct sdb_file 324{ 325 struct sdb_file *next; 326 char *name; 327}; 328 329/* This is the top of the stack. */ 330 331static struct sdb_file *current_file; 332 333#endif /* MIPS_DEBUGGING_INFO */ 334 335/* Set up for SDB output at the start of compilation. */ 336 337void 338sdbout_init (asm_file, input_file_name, syms) 339 FILE *asm_file; 340 char *input_file_name; 341 tree syms ATTRIBUTE_UNUSED; 342{ 343#ifdef MIPS_DEBUGGING_INFO 344 current_file = (struct sdb_file *) xmalloc (sizeof *current_file); 345 current_file->next = NULL; 346 current_file->name = input_file_name; 347#endif 348 349#ifdef RMS_QUICK_HACK_1 350 tree t; 351 for (t = syms; t; t = TREE_CHAIN (t)) 352 if (DECL_NAME (t) && IDENTIFIER_POINTER (DECL_NAME (t)) != 0 353 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (t)), "__vtbl_ptr_type")) 354 sdbout_symbol (t, 0); 355#endif 356} 357 358#if 0 359 360/* return the tag identifier for type 361 */ 362 363char * 364tag_of_ru_type (type,link) 365 tree type,link; 366{ 367 if (TYPE_SYMTAB_ADDRESS (type)) 368 return TYPE_SYMTAB_ADDRESS (type); 369 if (link && TREE_PURPOSE (link) 370 && IDENTIFIER_POINTER (TREE_PURPOSE (link))) 371 TYPE_SYMTAB_ADDRESS (type) = IDENTIFIER_POINTER (TREE_PURPOSE (link)); 372 else 373 return (char *) TYPE_SYMTAB_ADDRESS (type); 374} 375#endif 376 377/* Return a unique string to name an anonymous type. */ 378 379static char * 380gen_fake_label () 381{ 382 char label[10]; 383 char *labelstr; 384 SDB_GENERATE_FAKE (label, unnamed_struct_number); 385 unnamed_struct_number++; 386 labelstr = (char *) permalloc (strlen (label) + 1); 387 strcpy (labelstr, label); 388 return labelstr; 389} 390 391/* Return the number which describes TYPE for SDB. 392 For pointers, etc., this function is recursive. 393 Each record, union or enumeral type must already have had a 394 tag number output. */ 395 396/* The number is given by d6d5d4d3d2d1bbbb 397 where bbbb is 4 bit basic type, and di indicate one of notype,ptr,fn,array. 398 Thus, char *foo () has bbbb=T_CHAR 399 d1=D_FCN 400 d2=D_PTR 401 N_BTMASK= 017 1111 basic type field. 402 N_TSHIFT= 2 derived type shift 403 N_BTSHFT= 4 Basic type shift */ 404 405/* Produce the number that describes a pointer, function or array type. 406 PREV is the number describing the target, value or element type. 407 DT_type describes how to transform that type. */ 408#define PUSH_DERIVED_LEVEL(DT_type,PREV) \ 409 ((((PREV) & ~(int)N_BTMASK) << (int)N_TSHIFT) \ 410 | ((int)DT_type << (int)N_BTSHFT) \ 411 | ((PREV) & (int)N_BTMASK)) 412 413/* Number of elements used in sdb_dims. */ 414static int sdb_n_dims = 0; 415 416/* Table of array dimensions of current type. */ 417static int sdb_dims[SDB_MAX_DIM]; 418 419/* Size of outermost array currently being processed. */ 420static int sdb_type_size = -1; 421 422static int 423plain_type (type) 424 tree type; 425{ 426 int val = plain_type_1 (type, 0); 427 428 /* If we have already saved up some array dimensions, print them now. */ 429 if (sdb_n_dims > 0) 430 { 431 int i; 432 PUT_SDB_START_DIM; 433 for (i = sdb_n_dims - 1; i > 0; i--) 434 PUT_SDB_NEXT_DIM (sdb_dims[i]); 435 PUT_SDB_LAST_DIM (sdb_dims[0]); 436 sdb_n_dims = 0; 437 438 sdb_type_size = int_size_in_bytes (type); 439 /* Don't kill sdb if type is not laid out or has variable size. */ 440 if (sdb_type_size < 0) 441 sdb_type_size = 0; 442 } 443 /* If we have computed the size of an array containing this type, 444 print it now. */ 445 if (sdb_type_size >= 0) 446 { 447 PUT_SDB_SIZE (sdb_type_size); 448 sdb_type_size = -1; 449 } 450 return val; 451} 452 453static int 454template_name_p (name) 455 tree name; 456{ 457 register char *ptr = IDENTIFIER_POINTER (name); 458 while (*ptr && *ptr != '<') 459 ptr++; 460 461 return *ptr != '\0'; 462} 463 464static void 465sdbout_record_type_name (type) 466 tree type; 467{ 468 char *name = 0; 469 int no_name; 470 471 if (KNOWN_TYPE_TAG (type)) 472 return; 473 474 if (TYPE_NAME (type) != 0) 475 { 476 tree t = 0; 477 /* Find the IDENTIFIER_NODE for the type name. */ 478 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE) 479 t = TYPE_NAME (type); 480 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL) 481 { 482 t = DECL_NAME (TYPE_NAME (type)); 483 /* The DECL_NAME for templates includes "<>", which breaks 484 most assemblers. Use its assembler name instead, which 485 has been mangled into being safe. */ 486 if (t && template_name_p (t)) 487 t = DECL_ASSEMBLER_NAME (TYPE_NAME (type)); 488 } 489 490 /* Now get the name as a string, or invent one. */ 491 if (t != NULL_TREE) 492 name = IDENTIFIER_POINTER (t); 493 } 494 495 no_name = (name == 0 || *name == 0); 496 if (no_name) 497 name = gen_fake_label (); 498 499 SET_KNOWN_TYPE_TAG (type, name); 500#ifdef SDB_ALLOW_FORWARD_REFERENCES 501 if (no_name) 502 sdbout_queue_anonymous_type (type); 503#endif 504} 505 506/* Return the .type value for type TYPE. 507 508 LEVEL indicates how many levels deep we have recursed into the type. 509 The SDB debug format can only represent 6 derived levels of types. 510 After that, we must output inaccurate debug info. We deliberately 511 stop before the 7th level, so that ADA recursive types will not give an 512 infinite loop. */ 513 514static int 515plain_type_1 (type, level) 516 tree type; 517 int level; 518{ 519 if (type == 0) 520 type = void_type_node; 521 else if (type == error_mark_node) 522 type = integer_type_node; 523 else 524 type = TYPE_MAIN_VARIANT (type); 525 526 switch (TREE_CODE (type)) 527 { 528 case VOID_TYPE: 529 return T_VOID; 530 case BOOLEAN_TYPE: 531 case INTEGER_TYPE: 532 { 533 int size = int_size_in_bytes (type) * BITS_PER_UNIT; 534 535 /* Carefully distinguish all the standard types of C, 536 without messing up if the language is not C. 537 Note that we check only for the names that contain spaces; 538 other names might occur by coincidence in other languages. */ 539 if (TYPE_NAME (type) != 0 540 && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL 541 && DECL_NAME (TYPE_NAME (type)) != 0 542 && TREE_CODE (DECL_NAME (TYPE_NAME (type))) == IDENTIFIER_NODE) 543 { 544 char *name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))); 545 546 if (!strcmp (name, "char")) 547 return T_CHAR; 548 if (!strcmp (name, "unsigned char")) 549 return T_UCHAR; 550 if (!strcmp (name, "signed char")) 551 return T_CHAR; 552 if (!strcmp (name, "int")) 553 return T_INT; 554 if (!strcmp (name, "unsigned int")) 555 return T_UINT; 556 if (!strcmp (name, "short int")) 557 return T_SHORT; 558 if (!strcmp (name, "short unsigned int")) 559 return T_USHORT; 560 if (!strcmp (name, "long int")) 561 return T_LONG; 562 if (!strcmp (name, "long unsigned int")) 563 return T_ULONG; 564 } 565 566 if (size == INT_TYPE_SIZE) 567 return (TREE_UNSIGNED (type) ? T_UINT : T_INT); 568 if (size == CHAR_TYPE_SIZE) 569 return (TREE_UNSIGNED (type) ? T_UCHAR : T_CHAR); 570 if (size == SHORT_TYPE_SIZE) 571 return (TREE_UNSIGNED (type) ? T_USHORT : T_SHORT); 572 if (size == LONG_TYPE_SIZE) 573 return (TREE_UNSIGNED (type) ? T_ULONG : T_LONG); 574 if (size == LONG_LONG_TYPE_SIZE) /* better than nothing */ 575 return (TREE_UNSIGNED (type) ? T_ULONG : T_LONG); 576 return 0; 577 } 578 579 case REAL_TYPE: 580 { 581 int precision = TYPE_PRECISION (type); 582 if (precision == FLOAT_TYPE_SIZE) 583 return T_FLOAT; 584 if (precision == DOUBLE_TYPE_SIZE) 585 return T_DOUBLE; 586#ifdef EXTENDED_SDB_BASIC_TYPES 587 if (precision == LONG_DOUBLE_TYPE_SIZE) 588 return T_LNGDBL; 589#else 590 if (precision == LONG_DOUBLE_TYPE_SIZE) 591 return T_DOUBLE; /* better than nothing */ 592#endif 593 return 0; 594 } 595 596 case ARRAY_TYPE: 597 { 598 int m; 599 if (level >= 6) 600 return T_VOID; 601 else 602 m = plain_type_1 (TREE_TYPE (type), level+1); 603 if (sdb_n_dims < SDB_MAX_DIM) 604 sdb_dims[sdb_n_dims++] 605 = (TYPE_DOMAIN (type) 606 && TYPE_MAX_VALUE (TYPE_DOMAIN (type)) 607 && TREE_CODE (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) == INTEGER_CST 608 && TREE_CODE (TYPE_MIN_VALUE (TYPE_DOMAIN (type))) == INTEGER_CST 609 ? (TREE_INT_CST_LOW (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) 610 - TREE_INT_CST_LOW (TYPE_MIN_VALUE (TYPE_DOMAIN (type))) + 1) 611 : 0); 612 return PUSH_DERIVED_LEVEL (DT_ARY, m); 613 } 614 615 case RECORD_TYPE: 616 case UNION_TYPE: 617 case QUAL_UNION_TYPE: 618 case ENUMERAL_TYPE: 619 { 620 char *tag; 621#ifdef SDB_ALLOW_FORWARD_REFERENCES 622 sdbout_record_type_name (type); 623#endif 624#ifndef SDB_ALLOW_UNKNOWN_REFERENCES 625 if ((TREE_ASM_WRITTEN (type) && KNOWN_TYPE_TAG (type) != 0) 626#ifdef SDB_ALLOW_FORWARD_REFERENCES 627 || TYPE_MODE (type) != VOIDmode 628#endif 629 ) 630#endif 631 { 632 /* Output the referenced structure tag name 633 only if the .def has already been finished. 634 At least on 386, the Unix assembler 635 cannot handle forward references to tags. */ 636 /* But the 88100, it requires them, sigh... */ 637 /* And the MIPS requires unknown refs as well... */ 638 tag = KNOWN_TYPE_TAG (type); 639 PUT_SDB_TAG (tag); 640 /* These 3 lines used to follow the close brace. 641 However, a size of 0 without a tag implies a tag of 0, 642 so if we don't know a tag, we can't mention the size. */ 643 sdb_type_size = int_size_in_bytes (type); 644 if (sdb_type_size < 0) 645 sdb_type_size = 0; 646 } 647 return ((TREE_CODE (type) == RECORD_TYPE) ? T_STRUCT 648 : (TREE_CODE (type) == UNION_TYPE) ? T_UNION 649 : (TREE_CODE (type) == QUAL_UNION_TYPE) ? T_UNION 650 : T_ENUM); 651 } 652 case POINTER_TYPE: 653 case REFERENCE_TYPE: 654 { 655 int m; 656 if (level >= 6) 657 return T_VOID; 658 else 659 m = plain_type_1 (TREE_TYPE (type), level+1); 660 return PUSH_DERIVED_LEVEL (DT_PTR, m); 661 } 662 case FUNCTION_TYPE: 663 case METHOD_TYPE: 664 { 665 int m; 666 if (level >= 6) 667 return T_VOID; 668 else 669 m = plain_type_1 (TREE_TYPE (type), level+1); 670 return PUSH_DERIVED_LEVEL (DT_FCN, m); 671 } 672 default: 673 return 0; 674 } 675} 676 677/* Output the symbols defined in block number DO_BLOCK. 678 Set NEXT_BLOCK_NUMBER to 0 before calling. 679 680 This function works by walking the tree structure of blocks, 681 counting blocks until it finds the desired block. */ 682 683static int do_block = 0; 684 685static int next_block_number; 686 687static void 688sdbout_block (block) 689 register tree block; 690{ 691 while (block) 692 { 693 /* Ignore blocks never expanded or otherwise marked as real. */ 694 if (TREE_USED (block)) 695 { 696 /* When we reach the specified block, output its symbols. */ 697 if (next_block_number == do_block) 698 { 699 sdbout_syms (BLOCK_VARS (block)); 700 } 701 702 /* If we are past the specified block, stop the scan. */ 703 if (next_block_number > do_block) 704 return; 705 706 next_block_number++; 707 708 /* Scan the blocks within this block. */ 709 sdbout_block (BLOCK_SUBBLOCKS (block)); 710 } 711 712 block = BLOCK_CHAIN (block); 713 } 714} 715 716/* Call sdbout_symbol on each decl in the chain SYMS. */ 717 718static void 719sdbout_syms (syms) 720 tree syms; 721{ 722 while (syms) 723 { 724 if (TREE_CODE (syms) != LABEL_DECL) 725 sdbout_symbol (syms, 1); 726 syms = TREE_CHAIN (syms); 727 } 728} 729 730/* Output SDB information for a symbol described by DECL. 731 LOCAL is nonzero if the symbol is not file-scope. */ 732 733void 734sdbout_symbol (decl, local) 735 tree decl; 736 int local; 737{ 738 tree type = TREE_TYPE (decl); 739 tree context = NULL_TREE; 740 rtx value; 741 int regno = -1; 742 char *name; 743 744 sdbout_one_type (type); 745 746#if 0 /* This loses when functions are marked to be ignored, 747 which happens in the C++ front end. */ 748 if (DECL_IGNORED_P (decl)) 749 return; 750#endif 751 752 switch (TREE_CODE (decl)) 753 { 754 case CONST_DECL: 755 /* Enum values are defined by defining the enum type. */ 756 return; 757 758 case FUNCTION_DECL: 759 /* Don't mention a nested function under its parent. */ 760 context = decl_function_context (decl); 761 if (context == current_function_decl) 762 return; 763 /* Check DECL_INITIAL to distinguish declarations from definitions. 764 Don't output debug info here for declarations; they will have 765 a DECL_INITIAL value of 0. */ 766 if (! DECL_INITIAL (decl)) 767 return; 768 if (GET_CODE (DECL_RTL (decl)) != MEM 769 || GET_CODE (XEXP (DECL_RTL (decl), 0)) != SYMBOL_REF) 770 return; 771 PUT_SDB_DEF (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl))); 772 PUT_SDB_VAL (XEXP (DECL_RTL (decl), 0)); 773 PUT_SDB_SCL (TREE_PUBLIC (decl) ? C_EXT : C_STAT); 774 break; 775 776 case TYPE_DECL: 777 /* Done with tagged types. */ 778 if (DECL_NAME (decl) == 0) 779 return; 780 if (DECL_IGNORED_P (decl)) 781 return; 782 783 /* Output typedef name. */ 784 if (template_name_p (DECL_NAME (decl))) 785 PUT_SDB_DEF (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl))); 786 else 787 PUT_SDB_DEF (IDENTIFIER_POINTER (DECL_NAME (decl))); 788 PUT_SDB_SCL (C_TPDEF); 789 break; 790 791 case PARM_DECL: 792 /* Parm decls go in their own separate chains 793 and are output by sdbout_reg_parms and sdbout_parms. */ 794 abort (); 795 796 case VAR_DECL: 797 /* Don't mention a variable that is external. 798 Let the file that defines it describe it. */ 799 if (DECL_EXTERNAL (decl)) 800 return; 801 802 /* Ignore __FUNCTION__, etc. */ 803 if (DECL_IGNORED_P (decl)) 804 return; 805 806 /* If there was an error in the declaration, don't dump core 807 if there is no RTL associated with the variable doesn't 808 exist. */ 809 if (DECL_RTL (decl) == 0) 810 return; 811 812 DECL_RTL (decl) = eliminate_regs (DECL_RTL (decl), 0, NULL_RTX); 813#ifdef LEAF_REG_REMAP 814 if (current_function_uses_only_leaf_regs) 815 leaf_renumber_regs_insn (DECL_RTL (decl)); 816#endif 817 value = DECL_RTL (decl); 818 819 /* Don't mention a variable at all 820 if it was completely optimized into nothingness. 821 822 If DECL was from an inline function, then its rtl 823 is not identically the rtl that was used in this 824 particular compilation. */ 825 if (GET_CODE (value) == REG) 826 { 827 regno = REGNO (DECL_RTL (decl)); 828 if (regno >= FIRST_PSEUDO_REGISTER) 829 return; 830 } 831 else if (GET_CODE (value) == SUBREG) 832 { 833 int offset = 0; 834 while (GET_CODE (value) == SUBREG) 835 { 836 offset += SUBREG_WORD (value); 837 value = SUBREG_REG (value); 838 } 839 if (GET_CODE (value) == REG) 840 { 841 regno = REGNO (value); 842 if (regno >= FIRST_PSEUDO_REGISTER) 843 return; 844 regno += offset; 845 } 846 alter_subreg (DECL_RTL (decl)); 847 value = DECL_RTL (decl); 848 } 849 /* Don't output anything if an auto variable 850 gets RTL that is static. 851 GAS version 2.2 can't handle such output. */ 852 else if (GET_CODE (value) == MEM && CONSTANT_P (XEXP (value, 0)) 853 && ! TREE_STATIC (decl)) 854 return; 855 856 /* Emit any structure, union, or enum type that has not been output. 857 This occurs for tag-less structs (et al) used to declare variables 858 within functions. */ 859 if (TREE_CODE (type) == ENUMERAL_TYPE 860 || TREE_CODE (type) == RECORD_TYPE 861 || TREE_CODE (type) == UNION_TYPE 862 || TREE_CODE (type) == QUAL_UNION_TYPE) 863 { 864 if (TYPE_SIZE (type) != 0 /* not a forward reference */ 865 && KNOWN_TYPE_TAG (type) == 0) /* not yet declared */ 866 sdbout_one_type (type); 867 } 868 869 /* Defer SDB information for top-level initialized variables! */ 870 if (! local 871 && GET_CODE (value) == MEM 872 && DECL_INITIAL (decl)) 873 return; 874 875 /* C++ in 2.3 makes nameless symbols. That will be fixed later. 876 For now, avoid crashing. */ 877 if (DECL_NAME (decl) == NULL_TREE) 878 return; 879 880 /* Record the name for, starting a symtab entry. */ 881 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)); 882 883 if (GET_CODE (value) == MEM 884 && GET_CODE (XEXP (value, 0)) == SYMBOL_REF) 885 { 886 PUT_SDB_DEF (name); 887 if (TREE_PUBLIC (decl)) 888 { 889 PUT_SDB_VAL (XEXP (value, 0)); 890 PUT_SDB_SCL (C_EXT); 891 } 892 else 893 { 894 PUT_SDB_VAL (XEXP (value, 0)); 895 PUT_SDB_SCL (C_STAT); 896 } 897 } 898 else if (regno >= 0) 899 { 900 PUT_SDB_DEF (name); 901 PUT_SDB_INT_VAL (DBX_REGISTER_NUMBER (regno)); 902 PUT_SDB_SCL (C_REG); 903 } 904 else if (GET_CODE (value) == MEM 905 && (GET_CODE (XEXP (value, 0)) == MEM 906 || (GET_CODE (XEXP (value, 0)) == REG 907 && REGNO (XEXP (value, 0)) != HARD_FRAME_POINTER_REGNUM 908 && REGNO (XEXP (value, 0)) != STACK_POINTER_REGNUM))) 909 /* If the value is indirect by memory or by a register 910 that isn't the frame pointer 911 then it means the object is variable-sized and address through 912 that register or stack slot. COFF has no way to represent this 913 so all we can do is output the variable as a pointer. */ 914 { 915 PUT_SDB_DEF (name); 916 if (GET_CODE (XEXP (value, 0)) == REG) 917 { 918 PUT_SDB_INT_VAL (DBX_REGISTER_NUMBER (REGNO (XEXP (value, 0)))); 919 PUT_SDB_SCL (C_REG); 920 } 921 else 922 { 923 /* DECL_RTL looks like (MEM (MEM (PLUS (REG...) 924 (CONST_INT...)))). 925 We want the value of that CONST_INT. */ 926 /* Encore compiler hates a newline in a macro arg, it seems. */ 927 PUT_SDB_INT_VAL (DEBUGGER_AUTO_OFFSET 928 (XEXP (XEXP (value, 0), 0))); 929 PUT_SDB_SCL (C_AUTO); 930 } 931 932 /* Effectively do build_pointer_type, but don't cache this type, 933 since it might be temporary whereas the type it points to 934 might have been saved for inlining. */ 935 /* Don't use REFERENCE_TYPE because dbx can't handle that. */ 936 type = make_node (POINTER_TYPE); 937 TREE_TYPE (type) = TREE_TYPE (decl); 938 } 939 else if (GET_CODE (value) == MEM 940 && ((GET_CODE (XEXP (value, 0)) == PLUS 941 && GET_CODE (XEXP (XEXP (value, 0), 0)) == REG 942 && GET_CODE (XEXP (XEXP (value, 0), 1)) == CONST_INT) 943 /* This is for variables which are at offset zero from 944 the frame pointer. This happens on the Alpha. 945 Non-frame pointer registers are excluded above. */ 946 || (GET_CODE (XEXP (value, 0)) == REG))) 947 { 948 /* DECL_RTL looks like (MEM (PLUS (REG...) (CONST_INT...))) 949 or (MEM (REG...)). We want the value of that CONST_INT 950 or zero. */ 951 PUT_SDB_DEF (name); 952 PUT_SDB_INT_VAL (DEBUGGER_AUTO_OFFSET (XEXP (value, 0))); 953 PUT_SDB_SCL (C_AUTO); 954 } 955 else if (GET_CODE (value) == MEM && GET_CODE (XEXP (value, 0)) == CONST) 956 { 957 /* Handle an obscure case which can arise when optimizing and 958 when there are few available registers. (This is *always* 959 the case for i386/i486 targets). The DECL_RTL looks like 960 (MEM (CONST ...)) even though this variable is a local `auto' 961 or a local `register' variable. In effect, what has happened 962 is that the reload pass has seen that all assignments and 963 references for one such a local variable can be replaced by 964 equivalent assignments and references to some static storage 965 variable, thereby avoiding the need for a register. In such 966 cases we're forced to lie to debuggers and tell them that 967 this variable was itself `static'. */ 968 PUT_SDB_DEF (name); 969 PUT_SDB_VAL (XEXP (XEXP (value, 0), 0)); 970 PUT_SDB_SCL (C_STAT); 971 } 972 else 973 { 974 /* It is something we don't know how to represent for SDB. */ 975 return; 976 } 977 break; 978 979 default: 980 break; 981 } 982 PUT_SDB_TYPE (plain_type (type)); 983 PUT_SDB_ENDEF; 984} 985 986/* Output SDB information for a top-level initialized variable 987 that has been delayed. */ 988 989void 990sdbout_toplevel_data (decl) 991 tree decl; 992{ 993 tree type = TREE_TYPE (decl); 994 995 if (DECL_IGNORED_P (decl)) 996 return; 997 998 if (! (TREE_CODE (decl) == VAR_DECL 999 && GET_CODE (DECL_RTL (decl)) == MEM 1000 && DECL_INITIAL (decl))) 1001 abort (); 1002 1003 PUT_SDB_DEF (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl))); 1004 PUT_SDB_VAL (XEXP (DECL_RTL (decl), 0)); 1005 if (TREE_PUBLIC (decl)) 1006 { 1007 PUT_SDB_SCL (C_EXT); 1008 } 1009 else 1010 { 1011 PUT_SDB_SCL (C_STAT); 1012 } 1013 PUT_SDB_TYPE (plain_type (type)); 1014 PUT_SDB_ENDEF; 1015} 1016 1017#ifdef SDB_ALLOW_FORWARD_REFERENCES 1018 1019/* Machinery to record and output anonymous types. */ 1020 1021static tree anonymous_types; 1022 1023static void 1024sdbout_queue_anonymous_type (type) 1025 tree type; 1026{ 1027 anonymous_types = saveable_tree_cons (NULL_TREE, type, anonymous_types); 1028} 1029 1030static void 1031sdbout_dequeue_anonymous_types () 1032{ 1033 register tree types, link; 1034 1035 while (anonymous_types) 1036 { 1037 types = nreverse (anonymous_types); 1038 anonymous_types = NULL_TREE; 1039 1040 for (link = types; link; link = TREE_CHAIN (link)) 1041 { 1042 register tree type = TREE_VALUE (link); 1043 1044 if (type && ! TREE_ASM_WRITTEN (type)) 1045 sdbout_one_type (type); 1046 } 1047 } 1048} 1049 1050#endif 1051 1052/* Given a chain of ..._TYPE nodes, all of which have names, 1053 output definitions of those names, as typedefs. */ 1054 1055void 1056sdbout_types (types) 1057 register tree types; 1058{ 1059 register tree link; 1060 1061 for (link = types; link; link = TREE_CHAIN (link)) 1062 sdbout_one_type (link); 1063 1064#ifdef SDB_ALLOW_FORWARD_REFERENCES 1065 sdbout_dequeue_anonymous_types (); 1066#endif 1067} 1068 1069static void 1070sdbout_type (type) 1071 tree type; 1072{ 1073 if (type == error_mark_node) 1074 type = integer_type_node; 1075 PUT_SDB_TYPE (plain_type (type)); 1076} 1077 1078/* Output types of the fields of type TYPE, if they are structs. 1079 1080 Formerly did not chase through pointer types, since that could be circular. 1081 They must come before TYPE, since forward refs are not allowed. 1082 Now james@bigtex.cactus.org says to try them. */ 1083 1084static void 1085sdbout_field_types (type) 1086 tree type; 1087{ 1088 tree tail; 1089 1090 for (tail = TYPE_FIELDS (type); tail; tail = TREE_CHAIN (tail)) 1091 /* This condition should match the one for emitting the actual members 1092 below. */ 1093 if (TREE_CODE (tail) == FIELD_DECL 1094 && DECL_NAME (tail) != 0 1095 && TREE_CODE (DECL_SIZE (tail)) == INTEGER_CST 1096 && TREE_CODE (DECL_FIELD_BITPOS (tail)) == INTEGER_CST) 1097 { 1098 if (POINTER_TYPE_P (TREE_TYPE (tail))) 1099 sdbout_one_type (TREE_TYPE (TREE_TYPE (tail))); 1100 else 1101 sdbout_one_type (TREE_TYPE (tail)); 1102 } 1103} 1104 1105/* Use this to put out the top level defined record and union types 1106 for later reference. If this is a struct with a name, then put that 1107 name out. Other unnamed structs will have .xxfake labels generated so 1108 that they may be referred to later. 1109 The label will be stored in the KNOWN_TYPE_TAG slot of a type. 1110 It may NOT be called recursively. */ 1111 1112static void 1113sdbout_one_type (type) 1114 tree type; 1115{ 1116 if (current_function_decl != NULL_TREE 1117 && DECL_SECTION_NAME (current_function_decl) != NULL_TREE) 1118 ; /* Don't change section amid function. */ 1119 else 1120 text_section (); 1121 1122 switch (TREE_CODE (type)) 1123 { 1124 case RECORD_TYPE: 1125 case UNION_TYPE: 1126 case QUAL_UNION_TYPE: 1127 case ENUMERAL_TYPE: 1128 type = TYPE_MAIN_VARIANT (type); 1129 /* Don't output a type twice. */ 1130 if (TREE_ASM_WRITTEN (type)) 1131 /* James said test TREE_ASM_BEING_WRITTEN here. */ 1132 return; 1133 1134 /* Output nothing if type is not yet defined. */ 1135 if (TYPE_SIZE (type) == 0) 1136 return; 1137 1138 TREE_ASM_WRITTEN (type) = 1; 1139#if 1 1140 /* This is reputed to cause trouble with the following case, 1141 but perhaps checking TYPE_SIZE above will fix it. */ 1142 1143 /* Here is a test case: 1144 1145 struct foo { 1146 struct badstr *bbb; 1147 } forwardref; 1148 1149 typedef struct intermediate { 1150 int aaaa; 1151 } intermediate_ref; 1152 1153 typedef struct badstr { 1154 int ccccc; 1155 } badtype; */ 1156 1157#if 0 1158 TREE_ASM_BEING_WRITTEN (type) = 1; 1159#endif 1160 /* This change, which ought to make better output, 1161 used to make the COFF assembler unhappy. 1162 Changes involving KNOWN_TYPE_TAG may fix the problem. */ 1163 /* Before really doing anything, output types we want to refer to. */ 1164 /* Note that in version 1 the following two lines 1165 are not used if forward references are in use. */ 1166 if (TREE_CODE (type) != ENUMERAL_TYPE) 1167 sdbout_field_types (type); 1168#if 0 1169 TREE_ASM_WRITTEN (type) = 1; 1170#endif 1171#endif 1172 1173 /* Output a structure type. */ 1174 { 1175 int size = int_size_in_bytes (type); 1176 int member_scl; 1177 tree tem; 1178 int i, n_baseclasses = 0; 1179 1180 /* Record the type tag, but not in its permanent place just yet. */ 1181 sdbout_record_type_name (type); 1182 1183 PUT_SDB_DEF (KNOWN_TYPE_TAG (type)); 1184 1185 switch (TREE_CODE (type)) 1186 { 1187 case UNION_TYPE: 1188 case QUAL_UNION_TYPE: 1189 PUT_SDB_SCL (C_UNTAG); 1190 PUT_SDB_TYPE (T_UNION); 1191 member_scl = C_MOU; 1192 break; 1193 1194 case RECORD_TYPE: 1195 PUT_SDB_SCL (C_STRTAG); 1196 PUT_SDB_TYPE (T_STRUCT); 1197 member_scl = C_MOS; 1198 break; 1199 1200 case ENUMERAL_TYPE: 1201 PUT_SDB_SCL (C_ENTAG); 1202 PUT_SDB_TYPE (T_ENUM); 1203 member_scl = C_MOE; 1204 break; 1205 1206 default: 1207 break; 1208 } 1209 1210 PUT_SDB_SIZE (size); 1211 PUT_SDB_ENDEF; 1212 1213 /* Print out the base class information with fields 1214 named after the types they hold. */ 1215 /* This is only relevent to aggregate types. TYPE_BINFO is used 1216 for other purposes in an ENUMERAL_TYPE, so we must exclude that 1217 case. */ 1218 if (TREE_CODE (type) != ENUMERAL_TYPE) 1219 { 1220 if (TYPE_BINFO (type) 1221 && TYPE_BINFO_BASETYPES (type)) 1222 n_baseclasses = TREE_VEC_LENGTH (TYPE_BINFO_BASETYPES (type)); 1223 for (i = 0; i < n_baseclasses; i++) 1224 { 1225 tree child = TREE_VEC_ELT (BINFO_BASETYPES (TYPE_BINFO (type)), 1226 i); 1227 tree child_type = BINFO_TYPE (child); 1228 tree child_type_name; 1229 if (TYPE_NAME (child_type) == 0) 1230 continue; 1231 if (TREE_CODE (TYPE_NAME (child_type)) == IDENTIFIER_NODE) 1232 child_type_name = TYPE_NAME (child_type); 1233 else if (TREE_CODE (TYPE_NAME (child_type)) == TYPE_DECL) 1234 { 1235 child_type_name = DECL_NAME (TYPE_NAME (child_type)); 1236 if (child_type_name && template_name_p (child_type_name)) 1237 child_type_name 1238 = DECL_ASSEMBLER_NAME (TYPE_NAME (child_type)); 1239 } 1240 else 1241 continue; 1242 1243 CONTIN; 1244 PUT_SDB_DEF (IDENTIFIER_POINTER (child_type_name)); 1245 PUT_SDB_INT_VAL (TREE_INT_CST_LOW (BINFO_OFFSET (child))); 1246 PUT_SDB_SCL (member_scl); 1247 sdbout_type (BINFO_TYPE (child)); 1248 PUT_SDB_ENDEF; 1249 } 1250 } 1251 1252 /* output the individual fields */ 1253 1254 if (TREE_CODE (type) == ENUMERAL_TYPE) 1255 for (tem = TYPE_FIELDS (type); tem; tem = TREE_CHAIN (tem)) 1256 { 1257 PUT_SDB_DEF (IDENTIFIER_POINTER (TREE_PURPOSE (tem))); 1258 PUT_SDB_INT_VAL (TREE_INT_CST_LOW (TREE_VALUE (tem))); 1259 PUT_SDB_SCL (C_MOE); 1260 PUT_SDB_TYPE (T_MOE); 1261 PUT_SDB_ENDEF; 1262 } 1263 1264 else /* record or union type */ 1265 for (tem = TYPE_FIELDS (type); tem; tem = TREE_CHAIN (tem)) 1266 /* Output the name, type, position (in bits), size (in bits) 1267 of each field. */ 1268 1269 /* Omit here the nameless fields that are used to skip bits. 1270 Also omit fields with variable size or position. 1271 Also omit non FIELD_DECL nodes that GNU C++ may put here. */ 1272 if (TREE_CODE (tem) == FIELD_DECL 1273 && DECL_NAME (tem) != 0 1274 && TREE_CODE (DECL_SIZE (tem)) == INTEGER_CST 1275 && TREE_CODE (DECL_FIELD_BITPOS (tem)) == INTEGER_CST) 1276 { 1277 char *name; 1278 1279 CONTIN; 1280 name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (tem)); 1281 PUT_SDB_DEF (name); 1282 if (DECL_BIT_FIELD_TYPE (tem)) 1283 { 1284 PUT_SDB_INT_VAL (TREE_INT_CST_LOW (DECL_FIELD_BITPOS (tem))); 1285 PUT_SDB_SCL (C_FIELD); 1286 sdbout_type (DECL_BIT_FIELD_TYPE (tem)); 1287 PUT_SDB_SIZE (TREE_INT_CST_LOW (DECL_SIZE (tem))); 1288 } 1289 else 1290 { 1291 PUT_SDB_INT_VAL (TREE_INT_CST_LOW (DECL_FIELD_BITPOS (tem)) 1292 / BITS_PER_UNIT); 1293 PUT_SDB_SCL (member_scl); 1294 sdbout_type (TREE_TYPE (tem)); 1295 } 1296 PUT_SDB_ENDEF; 1297 } 1298 /* output end of a structure,union, or enumeral definition */ 1299 1300 PUT_SDB_PLAIN_DEF ("eos"); 1301 PUT_SDB_INT_VAL (size); 1302 PUT_SDB_SCL (C_EOS); 1303 PUT_SDB_TAG (KNOWN_TYPE_TAG (type)); 1304 PUT_SDB_SIZE (size); 1305 PUT_SDB_ENDEF; 1306 break; 1307 1308 default: 1309 break; 1310 } 1311 } 1312} 1313 1314/* The following two functions output definitions of function parameters. 1315 Each parameter gets a definition locating it in the parameter list. 1316 Each parameter that is a register variable gets a second definition 1317 locating it in the register. 1318 1319 Printing or argument lists in gdb uses the definitions that 1320 locate in the parameter list. But reference to the variable in 1321 expressions uses preferentially the definition as a register. */ 1322 1323/* Output definitions, referring to storage in the parmlist, 1324 of all the parms in PARMS, which is a chain of PARM_DECL nodes. */ 1325 1326static void 1327sdbout_parms (parms) 1328 tree parms; 1329{ 1330 for (; parms; parms = TREE_CHAIN (parms)) 1331 if (DECL_NAME (parms)) 1332 { 1333 int current_sym_value = 0; 1334 char *name = IDENTIFIER_POINTER (DECL_NAME (parms)); 1335 1336 if (name == 0 || *name == 0) 1337 name = gen_fake_label (); 1338 1339 /* Perform any necessary register eliminations on the parameter's rtl, 1340 so that the debugging output will be accurate. */ 1341 DECL_INCOMING_RTL (parms) 1342 = eliminate_regs (DECL_INCOMING_RTL (parms), 0, NULL_RTX); 1343 DECL_RTL (parms) = eliminate_regs (DECL_RTL (parms), 0, NULL_RTX); 1344 1345 if (PARM_PASSED_IN_MEMORY (parms)) 1346 { 1347 rtx addr = XEXP (DECL_INCOMING_RTL (parms), 0); 1348 tree type; 1349 1350 /* ??? Here we assume that the parm address is indexed 1351 off the frame pointer or arg pointer. 1352 If that is not true, we produce meaningless results, 1353 but do not crash. */ 1354 if (GET_CODE (addr) == PLUS 1355 && GET_CODE (XEXP (addr, 1)) == CONST_INT) 1356 current_sym_value = INTVAL (XEXP (addr, 1)); 1357 else 1358 current_sym_value = 0; 1359 1360 if (GET_CODE (DECL_RTL (parms)) == REG 1361 && REGNO (DECL_RTL (parms)) >= 0 1362 && REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER) 1363 type = DECL_ARG_TYPE (parms); 1364 else 1365 { 1366 int original_sym_value = current_sym_value; 1367 1368 /* This is the case where the parm is passed as an int or 1369 double and it is converted to a char, short or float 1370 and stored back in the parmlist. In this case, describe 1371 the parm with the variable's declared type, and adjust 1372 the address if the least significant bytes (which we are 1373 using) are not the first ones. */ 1374 if (BYTES_BIG_ENDIAN 1375 && TREE_TYPE (parms) != DECL_ARG_TYPE (parms)) 1376 current_sym_value += 1377 (GET_MODE_SIZE (TYPE_MODE (DECL_ARG_TYPE (parms))) 1378 - GET_MODE_SIZE (GET_MODE (DECL_RTL (parms)))); 1379 1380 if (GET_CODE (DECL_RTL (parms)) == MEM 1381 && GET_CODE (XEXP (DECL_RTL (parms), 0)) == PLUS 1382 && (GET_CODE (XEXP (XEXP (DECL_RTL (parms), 0), 1)) 1383 == CONST_INT) 1384 && (INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1)) 1385 == current_sym_value)) 1386 type = TREE_TYPE (parms); 1387 else 1388 { 1389 current_sym_value = original_sym_value; 1390 type = DECL_ARG_TYPE (parms); 1391 } 1392 } 1393 1394 PUT_SDB_DEF (name); 1395 PUT_SDB_INT_VAL (DEBUGGER_ARG_OFFSET (current_sym_value, addr)); 1396 PUT_SDB_SCL (C_ARG); 1397 PUT_SDB_TYPE (plain_type (type)); 1398 PUT_SDB_ENDEF; 1399 } 1400 else if (GET_CODE (DECL_RTL (parms)) == REG) 1401 { 1402 rtx best_rtl; 1403 /* Parm passed in registers and lives in registers or nowhere. */ 1404 1405 /* If parm lives in a register, use that register; 1406 pretend the parm was passed there. It would be more consistent 1407 to describe the register where the parm was passed, 1408 but in practice that register usually holds something else. */ 1409 if (REGNO (DECL_RTL (parms)) >= 0 1410 && REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER) 1411 best_rtl = DECL_RTL (parms); 1412 /* If the parm lives nowhere, 1413 use the register where it was passed. */ 1414 else 1415 best_rtl = DECL_INCOMING_RTL (parms); 1416 1417 PUT_SDB_DEF (name); 1418 PUT_SDB_INT_VAL (DBX_REGISTER_NUMBER (REGNO (best_rtl))); 1419 PUT_SDB_SCL (C_REGPARM); 1420 PUT_SDB_TYPE (plain_type (TREE_TYPE (parms))); 1421 PUT_SDB_ENDEF; 1422 } 1423 else if (GET_CODE (DECL_RTL (parms)) == MEM 1424 && XEXP (DECL_RTL (parms), 0) != const0_rtx) 1425 { 1426 /* Parm was passed in registers but lives on the stack. */ 1427 1428 /* DECL_RTL looks like (MEM (PLUS (REG...) (CONST_INT...))), 1429 in which case we want the value of that CONST_INT, 1430 or (MEM (REG ...)) or (MEM (MEM ...)), 1431 in which case we use a value of zero. */ 1432 if (GET_CODE (XEXP (DECL_RTL (parms), 0)) == REG 1433 || GET_CODE (XEXP (DECL_RTL (parms), 0)) == MEM) 1434 current_sym_value = 0; 1435 else 1436 current_sym_value = INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1)); 1437 1438 /* Again, this assumes the offset is based on the arg pointer. */ 1439 PUT_SDB_DEF (name); 1440 PUT_SDB_INT_VAL (DEBUGGER_ARG_OFFSET (current_sym_value, 1441 XEXP (DECL_RTL (parms), 0))); 1442 PUT_SDB_SCL (C_ARG); 1443 PUT_SDB_TYPE (plain_type (TREE_TYPE (parms))); 1444 PUT_SDB_ENDEF; 1445 } 1446 } 1447} 1448 1449/* Output definitions for the places where parms live during the function, 1450 when different from where they were passed, when the parms were passed 1451 in memory. 1452 1453 It is not useful to do this for parms passed in registers 1454 that live during the function in different registers, because it is 1455 impossible to look in the passed register for the passed value, 1456 so we use the within-the-function register to begin with. 1457 1458 PARMS is a chain of PARM_DECL nodes. */ 1459 1460static void 1461sdbout_reg_parms (parms) 1462 tree parms; 1463{ 1464 for (; parms; parms = TREE_CHAIN (parms)) 1465 if (DECL_NAME (parms)) 1466 { 1467 char *name = IDENTIFIER_POINTER (DECL_NAME (parms)); 1468 1469 /* Report parms that live in registers during the function 1470 but were passed in memory. */ 1471 if (GET_CODE (DECL_RTL (parms)) == REG 1472 && REGNO (DECL_RTL (parms)) >= 0 1473 && REGNO (DECL_RTL (parms)) < FIRST_PSEUDO_REGISTER 1474 && PARM_PASSED_IN_MEMORY (parms)) 1475 { 1476 if (name == 0 || *name == 0) 1477 name = gen_fake_label (); 1478 PUT_SDB_DEF (name); 1479 PUT_SDB_INT_VAL (DBX_REGISTER_NUMBER (REGNO (DECL_RTL (parms)))); 1480 PUT_SDB_SCL (C_REG); 1481 PUT_SDB_TYPE (plain_type (TREE_TYPE (parms))); 1482 PUT_SDB_ENDEF; 1483 } 1484 /* Report parms that live in memory but not where they were passed. */ 1485 else if (GET_CODE (DECL_RTL (parms)) == MEM 1486 && GET_CODE (XEXP (DECL_RTL (parms), 0)) == PLUS 1487 && GET_CODE (XEXP (XEXP (DECL_RTL (parms), 0), 1)) == CONST_INT 1488 && PARM_PASSED_IN_MEMORY (parms) 1489 && ! rtx_equal_p (DECL_RTL (parms), DECL_INCOMING_RTL (parms))) 1490 { 1491#if 0 /* ??? It is not clear yet what should replace this. */ 1492 int offset = DECL_OFFSET (parms) / BITS_PER_UNIT; 1493 /* A parm declared char is really passed as an int, 1494 so it occupies the least significant bytes. 1495 On a big-endian machine those are not the low-numbered ones. */ 1496 if (BYTES_BIG_ENDIAN 1497 && offset != -1 1498 && TREE_TYPE (parms) != DECL_ARG_TYPE (parms)) 1499 offset += (GET_MODE_SIZE (TYPE_MODE (DECL_ARG_TYPE (parms))) 1500 - GET_MODE_SIZE (GET_MODE (DECL_RTL (parms)))); 1501 if (INTVAL (XEXP (XEXP (DECL_RTL (parms), 0), 1)) != offset) {...} 1502#endif 1503 { 1504 if (name == 0 || *name == 0) 1505 name = gen_fake_label (); 1506 PUT_SDB_DEF (name); 1507 PUT_SDB_INT_VAL (DEBUGGER_AUTO_OFFSET 1508 (XEXP (DECL_RTL (parms), 0))); 1509 PUT_SDB_SCL (C_AUTO); 1510 PUT_SDB_TYPE (plain_type (TREE_TYPE (parms))); 1511 PUT_SDB_ENDEF; 1512 } 1513 } 1514 } 1515} 1516 1517/* Describe the beginning of an internal block within a function. 1518 Also output descriptions of variables defined in this block. 1519 1520 N is the number of the block, by order of beginning, counting from 1, 1521 and not counting the outermost (function top-level) block. 1522 The blocks match the BLOCKs in DECL_INITIAL (current_function_decl), 1523 if the count starts at 0 for the outermost one. */ 1524 1525void 1526sdbout_begin_block (file, line, n) 1527 FILE *file; 1528 int line; 1529 int n; 1530{ 1531 tree decl = current_function_decl; 1532 MAKE_LINE_SAFE (line); 1533 1534 /* The SCO compiler does not emit a separate block for the function level 1535 scope, so we avoid it here also. However, mips ECOFF compilers do emit 1536 a separate block, so we retain it when MIPS_DEBUGGING_INFO is defined. */ 1537#ifndef MIPS_DEBUGGING_INFO 1538 if (n != 1) 1539#endif 1540 PUT_SDB_BLOCK_START (line - sdb_begin_function_line); 1541 1542 if (n == 1) 1543 { 1544 /* Include the outermost BLOCK's variables in block 1. */ 1545 next_block_number = 0; 1546 do_block = 0; 1547 sdbout_block (DECL_INITIAL (decl)); 1548 } 1549 /* If -g1, suppress all the internal symbols of functions 1550 except for arguments. */ 1551 if (debug_info_level != DINFO_LEVEL_TERSE) 1552 { 1553 next_block_number = 0; 1554 do_block = n; 1555 sdbout_block (DECL_INITIAL (decl)); 1556 } 1557 1558#ifdef SDB_ALLOW_FORWARD_REFERENCES 1559 sdbout_dequeue_anonymous_types (); 1560#endif 1561} 1562 1563/* Describe the end line-number of an internal block within a function. */ 1564 1565void 1566sdbout_end_block (file, line, n) 1567 FILE *file; 1568 int line; 1569 int n ATTRIBUTE_UNUSED; 1570{ 1571 MAKE_LINE_SAFE (line); 1572 1573 /* The SCO compiler does not emit a separate block for the function level 1574 scope, so we avoid it here also. However, mips ECOFF compilers do emit 1575 a separate block, so we retain it when MIPS_DEBUGGING_INFO is defined. */ 1576#ifndef MIPS_DEBUGGING_INFO 1577 if (n != 1) 1578#endif 1579 PUT_SDB_BLOCK_END (line - sdb_begin_function_line); 1580} 1581 1582/* Output sdb info for the current function name. 1583 Called from assemble_start_function. */ 1584 1585void 1586sdbout_mark_begin_function () 1587{ 1588 sdbout_symbol (current_function_decl, 0); 1589} 1590 1591/* Called at beginning of function body (after prologue). 1592 Record the function's starting line number, so we can output 1593 relative line numbers for the other lines. 1594 Describe beginning of outermost block. 1595 Also describe the parameter list. */ 1596 1597void 1598sdbout_begin_function (line) 1599 int line; 1600{ 1601 sdb_begin_function_line = line - 1; 1602 PUT_SDB_FUNCTION_START (line); 1603 sdbout_parms (DECL_ARGUMENTS (current_function_decl)); 1604 sdbout_reg_parms (DECL_ARGUMENTS (current_function_decl)); 1605} 1606 1607/* Called at end of function (before epilogue). 1608 Describe end of outermost block. */ 1609 1610void 1611sdbout_end_function (line) 1612 int line; 1613{ 1614#ifdef SDB_ALLOW_FORWARD_REFERENCES 1615 sdbout_dequeue_anonymous_types (); 1616#endif 1617 1618 MAKE_LINE_SAFE (line); 1619 PUT_SDB_FUNCTION_END (line - sdb_begin_function_line); 1620 1621 /* Indicate we are between functions, for line-number output. */ 1622 sdb_begin_function_line = -1; 1623} 1624 1625/* Output sdb info for the absolute end of a function. 1626 Called after the epilogue is output. */ 1627 1628void 1629sdbout_end_epilogue () 1630{ 1631 char *name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (current_function_decl)); 1632 PUT_SDB_EPILOGUE_END (name); 1633} 1634 1635/* Output sdb info for the given label. Called only if LABEL_NAME (insn) 1636 is present. */ 1637 1638void 1639sdbout_label (insn) 1640 register rtx insn; 1641{ 1642 PUT_SDB_DEF (LABEL_NAME (insn)); 1643 PUT_SDB_VAL (insn); 1644 PUT_SDB_SCL (C_LABEL); 1645 PUT_SDB_TYPE (T_NULL); 1646 PUT_SDB_ENDEF; 1647} 1648 1649/* Change to reading from a new source file. */ 1650 1651void 1652sdbout_start_new_source_file (filename) 1653 char *filename; 1654{ 1655#ifdef MIPS_DEBUGGING_INFO 1656 struct sdb_file *n = (struct sdb_file *) xmalloc (sizeof *n); 1657 1658 n->next = current_file; 1659 n->name = filename; 1660 current_file = n; 1661 PUT_SDB_SRC_FILE (filename); 1662#endif 1663} 1664 1665/* Revert to reading a previous source file. */ 1666 1667void 1668sdbout_resume_previous_source_file () 1669{ 1670#ifdef MIPS_DEBUGGING_INFO 1671 struct sdb_file *next; 1672 1673 next = current_file->next; 1674 free (current_file); 1675 current_file = next; 1676 PUT_SDB_SRC_FILE (current_file->name); 1677#endif 1678} 1679 1680#endif /* SDB_DEBUGGING_INFO */ 1681