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Diffstat (limited to 'gdb/dbxread.c')
| -rw-r--r-- | gdb/dbxread.c | 2738 |
1 files changed, 2738 insertions, 0 deletions
diff --git a/gdb/dbxread.c b/gdb/dbxread.c new file mode 100644 index 0000000..0749412 --- /dev/null +++ b/gdb/dbxread.c @@ -0,0 +1,2738 @@ +/* Read dbx symbol tables and convert to internal format, for GDB. + Copyright 1986, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 1998 + Free Software Foundation, Inc. + +This file is part of GDB. + +This program is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2 of the License, or +(at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program; if not, write to the Free Software +Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ + +/* This module provides three functions: dbx_symfile_init, + which initializes to read a symbol file; dbx_new_init, which + discards existing cached information when all symbols are being + discarded; and dbx_symfile_read, which reads a symbol table + from a file. + + dbx_symfile_read only does the minimum work necessary for letting the + user "name" things symbolically; it does not read the entire symtab. + Instead, it reads the external and static symbols and puts them in partial + symbol tables. When more extensive information is requested of a + file, the corresponding partial symbol table is mutated into a full + fledged symbol table by going back and reading the symbols + for real. dbx_psymtab_to_symtab() is the function that does this */ + +#include "defs.h" +#include "gdb_string.h" + +#if defined(USG) || defined(__CYGNUSCLIB__) +#include <sys/types.h> +#include <fcntl.h> +#endif + +#include "obstack.h" +#include "gdb_stat.h" +#include <ctype.h> +#include "symtab.h" +#include "breakpoint.h" +#include "command.h" +#include "target.h" +#include "gdbcore.h" /* for bfd stuff */ +#include "libaout.h" /* FIXME Secret internal BFD stuff for a.out */ +#include "symfile.h" +#include "objfiles.h" +#include "buildsym.h" +#include "stabsread.h" +#include "gdb-stabs.h" +#include "demangle.h" +#include "language.h" /* Needed inside partial-stab.h */ +#include "complaints.h" + +#include "aout/aout64.h" +#include "aout/stab_gnu.h" /* We always use GNU stabs, not native, now */ + + +/* This macro returns the size field of a minimal symbol, which is normally + stored in the "info" field. The macro can be overridden for specific + targets (e.g. MIPS16) that use the info field for other purposes. */ +#ifndef MSYMBOL_SIZE +#define MSYMBOL_SIZE(msym) ((long) MSYMBOL_INFO (msym)) +#endif + + +/* We put a pointer to this structure in the read_symtab_private field + of the psymtab. */ + +struct symloc { + + /* Offset within the file symbol table of first local symbol for this + file. */ + + int ldsymoff; + + /* Length (in bytes) of the section of the symbol table devoted to + this file's symbols (actually, the section bracketed may contain + more than just this file's symbols). If ldsymlen is 0, the only + reason for this thing's existence is the dependency list. Nothing + else will happen when it is read in. */ + + int ldsymlen; + + /* The size of each symbol in the symbol file (in external form). */ + + int symbol_size; + + /* Further information needed to locate the symbols if they are in + an ELF file. */ + + int symbol_offset; + int string_offset; + int file_string_offset; +}; + +#define LDSYMOFF(p) (((struct symloc *)((p)->read_symtab_private))->ldsymoff) +#define LDSYMLEN(p) (((struct symloc *)((p)->read_symtab_private))->ldsymlen) +#define SYMLOC(p) ((struct symloc *)((p)->read_symtab_private)) +#define SYMBOL_SIZE(p) (SYMLOC(p)->symbol_size) +#define SYMBOL_OFFSET(p) (SYMLOC(p)->symbol_offset) +#define STRING_OFFSET(p) (SYMLOC(p)->string_offset) +#define FILE_STRING_OFFSET(p) (SYMLOC(p)->file_string_offset) + + +/* Remember what we deduced to be the source language of this psymtab. */ + +static enum language psymtab_language = language_unknown; + +/* Nonzero means give verbose info on gdb action. From main.c. */ + +extern int info_verbose; + +/* The BFD for this file -- implicit parameter to next_symbol_text. */ + +static bfd *symfile_bfd; + +/* The size of each symbol in the symbol file (in external form). + This is set by dbx_symfile_read when building psymtabs, and by + dbx_psymtab_to_symtab when building symtabs. */ + +static unsigned symbol_size; + +/* This is the offset of the symbol table in the executable file. */ + +static unsigned symbol_table_offset; + +/* This is the offset of the string table in the executable file. */ + +static unsigned string_table_offset; + +/* For elf+stab executables, the n_strx field is not a simple index + into the string table. Instead, each .o file has a base offset in + the string table, and the associated symbols contain offsets from + this base. The following two variables contain the base offset for + the current and next .o files. */ + +static unsigned int file_string_table_offset; +static unsigned int next_file_string_table_offset; + +/* .o and NLM files contain unrelocated addresses which are based at + 0. When non-zero, this flag disables some of the special cases for + Solaris elf+stab text addresses at location 0. */ + +static int symfile_relocatable = 0; + +/* If this is nonzero, N_LBRAC, N_RBRAC, and N_SLINE entries are + relative to the function start address. */ + +static int block_address_function_relative = 0; + +/* The lowest text address we have yet encountered. This is needed + because in an a.out file, there is no header field which tells us + what address the program is actually going to be loaded at, so we + need to make guesses based on the symbols (which *are* relocated to + reflect the address it will be loaded at). */ + +static CORE_ADDR lowest_text_address; + +/* Non-zero if there is any line number info in the objfile. Prevents + end_psymtab from discarding an otherwise empty psymtab. */ + +static int has_line_numbers; + +/* Complaints about the symbols we have encountered. */ + +struct complaint lbrac_complaint = + {"bad block start address patched", 0, 0}; + +struct complaint string_table_offset_complaint = + {"bad string table offset in symbol %d", 0, 0}; + +struct complaint unknown_symtype_complaint = + {"unknown symbol type %s", 0, 0}; + +struct complaint unknown_symchar_complaint = + {"unknown symbol descriptor `%c'", 0, 0}; + +struct complaint lbrac_rbrac_complaint = + {"block start larger than block end", 0, 0}; + +struct complaint lbrac_unmatched_complaint = + {"unmatched N_LBRAC before symtab pos %d", 0, 0}; + +struct complaint lbrac_mismatch_complaint = + {"N_LBRAC/N_RBRAC symbol mismatch at symtab pos %d", 0, 0}; + +struct complaint repeated_header_complaint = + {"\"repeated\" header file %s not previously seen, at symtab pos %d", 0, 0}; + +struct complaint unclaimed_bincl_complaint = + {"N_BINCL %s not in entries for any file, at symtab pos %d", 0, 0}; + +/* During initial symbol readin, we need to have a structure to keep + track of which psymtabs have which bincls in them. This structure + is used during readin to setup the list of dependencies within each + partial symbol table. */ + +struct header_file_location +{ + char *name; /* Name of header file */ + int instance; /* See above */ + struct partial_symtab *pst; /* Partial symtab that has the + BINCL/EINCL defs for this file */ +}; + +/* The actual list and controling variables */ +static struct header_file_location *bincl_list, *next_bincl; +static int bincls_allocated; + +/* Local function prototypes */ + +static void +process_now PARAMS ((struct objfile *)); + +static void +free_header_files PARAMS ((void)); + +static void +init_header_files PARAMS ((void)); + +static void +read_ofile_symtab PARAMS ((struct partial_symtab *)); + +static void +dbx_psymtab_to_symtab PARAMS ((struct partial_symtab *)); + +static void +dbx_psymtab_to_symtab_1 PARAMS ((struct partial_symtab *)); + +static void +read_dbx_dynamic_symtab PARAMS ((struct section_offsets *, + struct objfile *objfile)); + +static void +read_dbx_symtab PARAMS ((struct section_offsets *, struct objfile *, + CORE_ADDR, int)); + +static void +free_bincl_list PARAMS ((struct objfile *)); + +static struct partial_symtab * +find_corresponding_bincl_psymtab PARAMS ((char *, int)); + +static void +add_bincl_to_list PARAMS ((struct partial_symtab *, char *, int)); + +static void +init_bincl_list PARAMS ((int, struct objfile *)); + +static char * +dbx_next_symbol_text PARAMS ((struct objfile *)); + +static void +fill_symbuf PARAMS ((bfd *)); + +static void +dbx_symfile_init PARAMS ((struct objfile *)); + +static void +dbx_new_init PARAMS ((struct objfile *)); + +static void +dbx_symfile_read PARAMS ((struct objfile *, struct section_offsets *, int)); + +static void +dbx_symfile_finish PARAMS ((struct objfile *)); + +static void +record_minimal_symbol PARAMS ((char *, CORE_ADDR, int, struct objfile *)); + +static void +add_new_header_file PARAMS ((char *, int)); + +static void +add_old_header_file PARAMS ((char *, int)); + +static void +add_this_object_header_file PARAMS ((int)); + +/* Free up old header file tables */ + +static void +free_header_files () +{ + if (this_object_header_files) + { + free ((PTR)this_object_header_files); + this_object_header_files = NULL; + } + n_allocated_this_object_header_files = 0; +} + +/* Allocate new header file tables */ + +static void +init_header_files () +{ + n_allocated_this_object_header_files = 10; + this_object_header_files = (int *) xmalloc (10 * sizeof (int)); +} + +/* Add header file number I for this object file + at the next successive FILENUM. */ + +static void +add_this_object_header_file (i) + int i; +{ + if (n_this_object_header_files == n_allocated_this_object_header_files) + { + n_allocated_this_object_header_files *= 2; + this_object_header_files + = (int *) xrealloc ((char *) this_object_header_files, + n_allocated_this_object_header_files * sizeof (int)); + } + + this_object_header_files[n_this_object_header_files++] = i; +} + +/* Add to this file an "old" header file, one already seen in + a previous object file. NAME is the header file's name. + INSTANCE is its instance code, to select among multiple + symbol tables for the same header file. */ + +static void +add_old_header_file (name, instance) + char *name; + int instance; +{ + register struct header_file *p = HEADER_FILES (current_objfile); + register int i; + + for (i = 0; i < N_HEADER_FILES (current_objfile); i++) + if (STREQ (p[i].name, name) && instance == p[i].instance) + { + add_this_object_header_file (i); + return; + } + complain (&repeated_header_complaint, name, symnum); +} + +/* Add to this file a "new" header file: definitions for its types follow. + NAME is the header file's name. + Most often this happens only once for each distinct header file, + but not necessarily. If it happens more than once, INSTANCE has + a different value each time, and references to the header file + use INSTANCE values to select among them. + + dbx output contains "begin" and "end" markers for each new header file, + but at this level we just need to know which files there have been; + so we record the file when its "begin" is seen and ignore the "end". */ + +static void +add_new_header_file (name, instance) + char *name; + int instance; +{ + register int i; + register struct header_file *hfile; + + /* Make sure there is room for one more header file. */ + + i = N_ALLOCATED_HEADER_FILES (current_objfile); + + if (N_HEADER_FILES (current_objfile) == i) + { + if (i == 0) + { + N_ALLOCATED_HEADER_FILES (current_objfile) = 10; + HEADER_FILES (current_objfile) = (struct header_file *) + xmalloc (10 * sizeof (struct header_file)); + } + else + { + i *= 2; + N_ALLOCATED_HEADER_FILES (current_objfile) = i; + HEADER_FILES (current_objfile) = (struct header_file *) + xrealloc ((char *) HEADER_FILES (current_objfile), + (i * sizeof (struct header_file))); + } + } + + /* Create an entry for this header file. */ + + i = N_HEADER_FILES (current_objfile)++; + hfile = HEADER_FILES (current_objfile) + i; + hfile->name = savestring (name, strlen(name)); + hfile->instance = instance; + hfile->length = 10; + hfile->vector + = (struct type **) xmalloc (10 * sizeof (struct type *)); + memset (hfile->vector, 0, 10 * sizeof (struct type *)); + + add_this_object_header_file (i); +} + +#if 0 +static struct type ** +explicit_lookup_type (real_filenum, index) + int real_filenum, index; +{ + register struct header_file *f = &HEADER_FILES (current_objfile)[real_filenum]; + + if (index >= f->length) + { + f->length *= 2; + f->vector = (struct type **) + xrealloc (f->vector, f->length * sizeof (struct type *)); + memset (&f->vector[f->length / 2], + '\0', f->length * sizeof (struct type *) / 2); + } + return &f->vector[index]; +} +#endif + +static void +record_minimal_symbol (name, address, type, objfile) + char *name; + CORE_ADDR address; + int type; + struct objfile *objfile; +{ + enum minimal_symbol_type ms_type; + int section; + asection *bfd_section; + + switch (type) + { + case N_TEXT | N_EXT: + ms_type = mst_text; + section = SECT_OFF_TEXT; + bfd_section = DBX_TEXT_SECTION (objfile); + break; + case N_DATA | N_EXT: + ms_type = mst_data; + section = SECT_OFF_DATA; + bfd_section = DBX_DATA_SECTION (objfile); + break; + case N_BSS | N_EXT: + ms_type = mst_bss; + section = SECT_OFF_BSS; + bfd_section = DBX_BSS_SECTION (objfile); + break; + case N_ABS | N_EXT: + ms_type = mst_abs; + section = -1; + bfd_section = NULL; + break; +#ifdef N_SETV + case N_SETV | N_EXT: + ms_type = mst_data; + section = SECT_OFF_DATA; + bfd_section = DBX_DATA_SECTION (objfile); + break; + case N_SETV: + /* I don't think this type actually exists; since a N_SETV is the result + of going over many .o files, it doesn't make sense to have one + file local. */ + ms_type = mst_file_data; + section = SECT_OFF_DATA; + bfd_section = DBX_DATA_SECTION (objfile); + break; +#endif + case N_TEXT: + case N_NBTEXT: + case N_FN: + case N_FN_SEQ: + ms_type = mst_file_text; + section = SECT_OFF_TEXT; + bfd_section = DBX_TEXT_SECTION (objfile); + break; + case N_DATA: + ms_type = mst_file_data; + + /* Check for __DYNAMIC, which is used by Sun shared libraries. + Record it as global even if it's local, not global, so + lookup_minimal_symbol can find it. We don't check symbol_leading_char + because for SunOS4 it always is '_'. */ + if (name[8] == 'C' && STREQ ("__DYNAMIC", name)) + ms_type = mst_data; + + /* Same with virtual function tables, both global and static. */ + { + char *tempstring = name; + if (tempstring[0] == bfd_get_symbol_leading_char (objfile->obfd)) + ++tempstring; + if (VTBL_PREFIX_P ((tempstring))) + ms_type = mst_data; + } + section = SECT_OFF_DATA; + bfd_section = DBX_DATA_SECTION (objfile); + break; + case N_BSS: + ms_type = mst_file_bss; + section = SECT_OFF_BSS; + bfd_section = DBX_BSS_SECTION (objfile); + break; + default: + ms_type = mst_unknown; + section = -1; + bfd_section = NULL; + break; + } + + if ((ms_type == mst_file_text || ms_type == mst_text) + && address < lowest_text_address) + lowest_text_address = address; + + prim_record_minimal_symbol_and_info + (name, address, ms_type, NULL, section, bfd_section, objfile); +} + +/* Scan and build partial symbols for a symbol file. + We have been initialized by a call to dbx_symfile_init, which + put all the relevant info into a "struct dbx_symfile_info", + hung off the objfile structure. + + SECTION_OFFSETS contains offsets relative to which the symbols in the + various sections are (depending where the sections were actually loaded). + MAINLINE is true if we are reading the main symbol + table (as opposed to a shared lib or dynamically loaded file). */ + +static void +dbx_symfile_read (objfile, section_offsets, mainline) + struct objfile *objfile; + struct section_offsets *section_offsets; + int mainline; /* FIXME comments above */ +{ + bfd *sym_bfd; + int val; + struct cleanup *back_to; + + val = strlen (objfile->name); + + sym_bfd = objfile->obfd; + + /* .o and .nlm files are relocatables with text, data and bss segs based at + 0. This flag disables special (Solaris stabs-in-elf only) fixups for + symbols with a value of 0. */ + + symfile_relocatable = bfd_get_file_flags (sym_bfd) & HAS_RELOC; + + /* This is true for Solaris (and all other systems which put stabs + in sections, hopefully, since it would be silly to do things + differently from Solaris), and false for SunOS4 and other a.out + file formats. */ + block_address_function_relative = + ((0 == strncmp (bfd_get_target (sym_bfd), "elf", 3)) + || (0 == strncmp (bfd_get_target (sym_bfd), "som", 3)) + || (0 == strncmp (bfd_get_target (sym_bfd), "coff", 4)) + || (0 == strncmp (bfd_get_target (sym_bfd), "pe", 2)) + || (0 == strncmp (bfd_get_target (sym_bfd), "nlm", 3))); + + val = bfd_seek (sym_bfd, DBX_SYMTAB_OFFSET (objfile), SEEK_SET); + if (val < 0) + perror_with_name (objfile->name); + + /* If we are reinitializing, or if we have never loaded syms yet, init */ + if (mainline + || objfile->global_psymbols.size == 0 + || objfile->static_psymbols.size == 0) + init_psymbol_list (objfile, DBX_SYMCOUNT (objfile)); + + symbol_size = DBX_SYMBOL_SIZE (objfile); + symbol_table_offset = DBX_SYMTAB_OFFSET (objfile); + + free_pending_blocks (); + back_to = make_cleanup ((make_cleanup_func) really_free_pendings, 0); + + init_minimal_symbol_collection (); + make_cleanup ((make_cleanup_func) discard_minimal_symbols, 0); + + /* Now that the symbol table data of the executable file are all in core, + process them and define symbols accordingly. */ + + read_dbx_symtab (section_offsets, objfile, + DBX_TEXT_ADDR (objfile), + DBX_TEXT_SIZE (objfile)); + + /* Add the dynamic symbols. */ + + read_dbx_dynamic_symtab (section_offsets, objfile); + + /* Install any minimal symbols that have been collected as the current + minimal symbols for this objfile. */ + + install_minimal_symbols (objfile); + + do_cleanups (back_to); +} + +/* Initialize anything that needs initializing when a completely new + symbol file is specified (not just adding some symbols from another + file, e.g. a shared library). */ + +static void +dbx_new_init (ignore) + struct objfile *ignore; +{ + stabsread_new_init (); + buildsym_new_init (); + init_header_files (); +} + + +/* dbx_symfile_init () + is the dbx-specific initialization routine for reading symbols. + It is passed a struct objfile which contains, among other things, + the BFD for the file whose symbols are being read, and a slot for a pointer + to "private data" which we fill with goodies. + + We read the string table into malloc'd space and stash a pointer to it. + + Since BFD doesn't know how to read debug symbols in a format-independent + way (and may never do so...), we have to do it ourselves. We will never + be called unless this is an a.out (or very similar) file. + FIXME, there should be a cleaner peephole into the BFD environment here. */ + +#define DBX_STRINGTAB_SIZE_SIZE sizeof(long) /* FIXME */ + +static void +dbx_symfile_init (objfile) + struct objfile *objfile; +{ + int val; + bfd *sym_bfd = objfile->obfd; + char *name = bfd_get_filename (sym_bfd); + asection *text_sect; + unsigned char size_temp[DBX_STRINGTAB_SIZE_SIZE]; + + /* Allocate struct to keep track of the symfile */ + objfile->sym_stab_info = (struct dbx_symfile_info *) + xmmalloc (objfile -> md, sizeof (struct dbx_symfile_info)); + memset ((PTR) objfile->sym_stab_info, 0, sizeof (struct dbx_symfile_info)); + + DBX_TEXT_SECTION (objfile) = bfd_get_section_by_name (sym_bfd, ".text"); + DBX_DATA_SECTION (objfile) = bfd_get_section_by_name (sym_bfd, ".data"); + DBX_BSS_SECTION (objfile) = bfd_get_section_by_name (sym_bfd, ".bss"); + + /* FIXME POKING INSIDE BFD DATA STRUCTURES */ +#define STRING_TABLE_OFFSET (sym_bfd->origin + obj_str_filepos (sym_bfd)) +#define SYMBOL_TABLE_OFFSET (sym_bfd->origin + obj_sym_filepos (sym_bfd)) + + /* FIXME POKING INSIDE BFD DATA STRUCTURES */ + + DBX_SYMFILE_INFO (objfile)->stab_section_info = NULL; + + text_sect = bfd_get_section_by_name (sym_bfd, ".text"); + if (!text_sect) + error ("Can't find .text section in symbol file"); + DBX_TEXT_ADDR (objfile) = bfd_section_vma (sym_bfd, text_sect); + DBX_TEXT_SIZE (objfile) = bfd_section_size (sym_bfd, text_sect); + + DBX_SYMBOL_SIZE (objfile) = obj_symbol_entry_size (sym_bfd); + DBX_SYMCOUNT (objfile) = bfd_get_symcount (sym_bfd); + DBX_SYMTAB_OFFSET (objfile) = SYMBOL_TABLE_OFFSET; + + /* Read the string table and stash it away in the psymbol_obstack. It is + only needed as long as we need to expand psymbols into full symbols, + so when we blow away the psymbol the string table goes away as well. + Note that gdb used to use the results of attempting to malloc the + string table, based on the size it read, as a form of sanity check + for botched byte swapping, on the theory that a byte swapped string + table size would be so totally bogus that the malloc would fail. Now + that we put in on the psymbol_obstack, we can't do this since gdb gets + a fatal error (out of virtual memory) if the size is bogus. We can + however at least check to see if the size is less than the size of + the size field itself, or larger than the size of the entire file. + Note that all valid string tables have a size greater than zero, since + the bytes used to hold the size are included in the count. */ + + if (STRING_TABLE_OFFSET == 0) + { + /* It appears that with the existing bfd code, STRING_TABLE_OFFSET + will never be zero, even when there is no string table. This + would appear to be a bug in bfd. */ + DBX_STRINGTAB_SIZE (objfile) = 0; + DBX_STRINGTAB (objfile) = NULL; + } + else + { + val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, SEEK_SET); + if (val < 0) + perror_with_name (name); + + memset ((PTR) size_temp, 0, sizeof (size_temp)); + val = bfd_read ((PTR) size_temp, sizeof (size_temp), 1, sym_bfd); + if (val < 0) + { + perror_with_name (name); + } + else if (val == 0) + { + /* With the existing bfd code, STRING_TABLE_OFFSET will be set to + EOF if there is no string table, and attempting to read the size + from EOF will read zero bytes. */ + DBX_STRINGTAB_SIZE (objfile) = 0; + DBX_STRINGTAB (objfile) = NULL; + } + else + { + /* Read some data that would appear to be the string table size. + If there really is a string table, then it is probably the right + size. Byteswap if necessary and validate the size. Note that + the minimum is DBX_STRINGTAB_SIZE_SIZE. If we just read some + random data that happened to be at STRING_TABLE_OFFSET, because + bfd can't tell us there is no string table, the sanity checks may + or may not catch this. */ + DBX_STRINGTAB_SIZE (objfile) = bfd_h_get_32 (sym_bfd, size_temp); + + if (DBX_STRINGTAB_SIZE (objfile) < sizeof (size_temp) + || DBX_STRINGTAB_SIZE (objfile) > bfd_get_size (sym_bfd)) + error ("ridiculous string table size (%d bytes).", + DBX_STRINGTAB_SIZE (objfile)); + + DBX_STRINGTAB (objfile) = + (char *) obstack_alloc (&objfile -> psymbol_obstack, + DBX_STRINGTAB_SIZE (objfile)); + OBJSTAT (objfile, sz_strtab += DBX_STRINGTAB_SIZE (objfile)); + + /* Now read in the string table in one big gulp. */ + + val = bfd_seek (sym_bfd, STRING_TABLE_OFFSET, SEEK_SET); + if (val < 0) + perror_with_name (name); + val = bfd_read (DBX_STRINGTAB (objfile), DBX_STRINGTAB_SIZE (objfile), 1, + sym_bfd); + if (val != DBX_STRINGTAB_SIZE (objfile)) + perror_with_name (name); + } + } +} + +/* Perform any local cleanups required when we are done with a particular + objfile. I.E, we are in the process of discarding all symbol information + for an objfile, freeing up all memory held for it, and unlinking the + objfile struct from the global list of known objfiles. */ + +static void +dbx_symfile_finish (objfile) + struct objfile *objfile; +{ + if (objfile->sym_stab_info != NULL) + { + if (HEADER_FILES (objfile) != NULL) + { + register int i = N_HEADER_FILES (objfile); + register struct header_file *hfiles = HEADER_FILES (objfile); + + while (--i >= 0) + { + free (hfiles [i].name); + free (hfiles [i].vector); + } + free ((PTR) hfiles); + } + mfree (objfile -> md, objfile->sym_stab_info); + } + free_header_files (); +} + + +/* Buffer for reading the symbol table entries. */ +static struct external_nlist symbuf[4096]; +static int symbuf_idx; +static int symbuf_end; + +/* cont_elem is used for continuing information in cfront. + It saves information about which types need to be fixed up and + completed after all the stabs are read. */ +struct cont_elem + { + /* sym and stabsstring for continuing information in cfront */ + struct symbol * sym; + char * stabs; + /* state dependancies (statics that must be preserved) */ + int sym_idx; + int sym_end; + int symnum; + int (*func) PARAMS ((struct objfile *, struct symbol *, char *)); + /* other state dependancies include: + (assumption is that these will not change since process_now FIXME!!) + stringtab_global + n_stabs + objfile + symfile_bfd */ +}; + +static struct cont_elem *cont_list = 0; +static int cont_limit = 0; +static int cont_count = 0; + +/* Arrange for function F to be called with arguments SYM and P later + in the stabs reading process. */ +void +process_later (sym, p, f) + struct symbol *sym; + char *p; + int (*f) PARAMS ((struct objfile *, struct symbol *, char *)); +{ + + /* Allocate more space for the deferred list. */ + if (cont_count >= cont_limit - 1) + { + cont_limit += 32; /* chunk size */ + + cont_list + = (struct cont_elem *) xrealloc (cont_list, + (cont_limit + * sizeof (struct cont_elem))); + if (!cont_list) + error ("Virtual memory exhausted\n"); + } + + /* Save state variables so we can process these stabs later. */ + cont_list[cont_count].sym_idx = symbuf_idx; + cont_list[cont_count].sym_end = symbuf_end; + cont_list[cont_count].symnum = symnum; + cont_list[cont_count].sym = sym; + cont_list[cont_count].stabs = p; + cont_list[cont_count].func = f; + cont_count++; +} + +/* Call deferred funtions in CONT_LIST. */ + +static void +process_now (objfile) + struct objfile *objfile; +{ + int i; + int save_symbuf_idx; + int save_symbuf_end; + int save_symnum; + struct symbol *sym; + char *stabs; + int err; + int (*func) PARAMS ((struct objfile *, struct symbol *, char *)); + + /* Save the state of our caller, we'll want to restore it before + returning. */ + save_symbuf_idx = symbuf_idx; + save_symbuf_end = symbuf_end; + save_symnum = symnum; + + /* Iterate over all the deferred stabs. */ + for (i = 0; i < cont_count; i++) + { + /* Restore the state for this deferred stab. */ + symbuf_idx = cont_list[i].sym_idx; + symbuf_end = cont_list[i].sym_end; + symnum = cont_list[i].symnum; + sym = cont_list[i].sym; + stabs = cont_list[i].stabs; + func = cont_list[i].func; + + /* Call the function to handle this deferrd stab. */ + err = (*func) (objfile, sym, stabs); + if (err) + error ("Internal error: unable to resolve stab.\n"); + } + + /* Restore our caller's state. */ + symbuf_idx = save_symbuf_idx; + symbuf_end = save_symbuf_end; + symnum = save_symnum; + cont_count = 0; +} + + +/* Name of last function encountered. Used in Solaris to approximate + object file boundaries. */ +static char *last_function_name; + +/* The address in memory of the string table of the object file we are + reading (which might not be the "main" object file, but might be a + shared library or some other dynamically loaded thing). This is + set by read_dbx_symtab when building psymtabs, and by + read_ofile_symtab when building symtabs, and is used only by + next_symbol_text. FIXME: If that is true, we don't need it when + building psymtabs, right? */ +static char *stringtab_global; + +/* These variables are used to control fill_symbuf when the stabs + symbols are not contiguous (as may be the case when a COFF file is + linked using --split-by-reloc). */ +static struct stab_section_list *symbuf_sections; +static unsigned int symbuf_left; +static unsigned int symbuf_read; + +/* Refill the symbol table input buffer + and set the variables that control fetching entries from it. + Reports an error if no data available. + This function can read past the end of the symbol table + (into the string table) but this does no harm. */ + +static void +fill_symbuf (sym_bfd) + bfd *sym_bfd; +{ + unsigned int count; + int nbytes; + + if (symbuf_sections == NULL) + count = sizeof (symbuf); + else + { + if (symbuf_left <= 0) + { + file_ptr filepos = symbuf_sections->section->filepos; + if (bfd_seek (sym_bfd, filepos, SEEK_SET) != 0) + perror_with_name (bfd_get_filename (sym_bfd)); + symbuf_left = bfd_section_size (sym_bfd, symbuf_sections->section); + symbol_table_offset = filepos - symbuf_read; + symbuf_sections = symbuf_sections->next; + } + + count = symbuf_left; + if (count > sizeof (symbuf)) + count = sizeof (symbuf); + } + + nbytes = bfd_read ((PTR)symbuf, count, 1, sym_bfd); + if (nbytes < 0) + perror_with_name (bfd_get_filename (sym_bfd)); + else if (nbytes == 0) + error ("Premature end of file reading symbol table"); + symbuf_end = nbytes / symbol_size; + symbuf_idx = 0; + symbuf_left -= nbytes; + symbuf_read += nbytes; +} + +#define SWAP_SYMBOL(symp, abfd) \ + { \ + (symp)->n_strx = bfd_h_get_32(abfd, \ + (unsigned char *)&(symp)->n_strx); \ + (symp)->n_desc = bfd_h_get_16 (abfd, \ + (unsigned char *)&(symp)->n_desc); \ + (symp)->n_value = bfd_h_get_32 (abfd, \ + (unsigned char *)&(symp)->n_value); \ + } + +#define INTERNALIZE_SYMBOL(intern, extern, abfd) \ + { \ + (intern).n_type = bfd_h_get_8 (abfd, (extern)->e_type); \ + (intern).n_strx = bfd_h_get_32 (abfd, (extern)->e_strx); \ + (intern).n_desc = bfd_h_get_16 (abfd, (extern)->e_desc); \ + (intern).n_value = bfd_h_get_32 (abfd, (extern)->e_value); \ + } + +/* Invariant: The symbol pointed to by symbuf_idx is the first one + that hasn't been swapped. Swap the symbol at the same time + that symbuf_idx is incremented. */ + +/* dbx allows the text of a symbol name to be continued into the + next symbol name! When such a continuation is encountered + (a \ at the end of the text of a name) + call this function to get the continuation. */ + +static char * +dbx_next_symbol_text (objfile) + struct objfile *objfile; +{ + struct internal_nlist nlist; + + if (symbuf_idx == symbuf_end) + fill_symbuf (symfile_bfd); + + symnum++; + INTERNALIZE_SYMBOL(nlist, &symbuf[symbuf_idx], symfile_bfd); + OBJSTAT (objfile, n_stabs++); + + symbuf_idx++; + + return nlist.n_strx + stringtab_global + file_string_table_offset; +} + +/* Initialize the list of bincls to contain none and have some + allocated. */ + +static void +init_bincl_list (number, objfile) + int number; + struct objfile *objfile; +{ + bincls_allocated = number; + next_bincl = bincl_list = (struct header_file_location *) + xmmalloc (objfile -> md, bincls_allocated * sizeof(struct header_file_location)); +} + +/* Add a bincl to the list. */ + +static void +add_bincl_to_list (pst, name, instance) + struct partial_symtab *pst; + char *name; + int instance; +{ + if (next_bincl >= bincl_list + bincls_allocated) + { + int offset = next_bincl - bincl_list; + bincls_allocated *= 2; + bincl_list = (struct header_file_location *) + xmrealloc (pst->objfile->md, (char *)bincl_list, + bincls_allocated * sizeof (struct header_file_location)); + next_bincl = bincl_list + offset; + } + next_bincl->pst = pst; + next_bincl->instance = instance; + next_bincl++->name = name; +} + +/* Given a name, value pair, find the corresponding + bincl in the list. Return the partial symtab associated + with that header_file_location. */ + +static struct partial_symtab * +find_corresponding_bincl_psymtab (name, instance) + char *name; + int instance; +{ + struct header_file_location *bincl; + + for (bincl = bincl_list; bincl < next_bincl; bincl++) + if (bincl->instance == instance + && STREQ (name, bincl->name)) + return bincl->pst; + + complain (&repeated_header_complaint, name, symnum); + return (struct partial_symtab *) 0; +} + +/* Free the storage allocated for the bincl list. */ + +static void +free_bincl_list (objfile) + struct objfile *objfile; +{ + mfree (objfile -> md, (PTR)bincl_list); + bincls_allocated = 0; +} + +/* Scan a SunOs dynamic symbol table for symbols of interest and + add them to the minimal symbol table. */ + +static void +read_dbx_dynamic_symtab (section_offsets, objfile) + struct section_offsets *section_offsets; + struct objfile *objfile; +{ + bfd *abfd = objfile->obfd; + struct cleanup *back_to; + int counter; + long dynsym_size; + long dynsym_count; + asymbol **dynsyms; + asymbol **symptr; + arelent **relptr; + long dynrel_size; + long dynrel_count; + arelent **dynrels; + CORE_ADDR sym_value; + char *name; + + /* Check that the symbol file has dynamic symbols that we know about. + bfd_arch_unknown can happen if we are reading a sun3 symbol file + on a sun4 host (and vice versa) and bfd is not configured + --with-target=all. This would trigger an assertion in bfd/sunos.c, + so we ignore the dynamic symbols in this case. */ + if (bfd_get_flavour (abfd) != bfd_target_aout_flavour + || (bfd_get_file_flags (abfd) & DYNAMIC) == 0 + || bfd_get_arch (abfd) == bfd_arch_unknown) + return; + + dynsym_size = bfd_get_dynamic_symtab_upper_bound (abfd); + if (dynsym_size < 0) + return; + + dynsyms = (asymbol **) xmalloc (dynsym_size); + back_to = make_cleanup (free, dynsyms); + + dynsym_count = bfd_canonicalize_dynamic_symtab (abfd, dynsyms); + if (dynsym_count < 0) + { + do_cleanups (back_to); + return; + } + + /* Enter dynamic symbols into the minimal symbol table + if this is a stripped executable. */ + if (bfd_get_symcount (abfd) <= 0) + { + symptr = dynsyms; + for (counter = 0; counter < dynsym_count; counter++, symptr++) + { + asymbol *sym = *symptr; + asection *sec; + int type; + + sec = bfd_get_section (sym); + + /* BFD symbols are section relative. */ + sym_value = sym->value + sec->vma; + + if (bfd_get_section_flags (abfd, sec) & SEC_CODE) + { + sym_value += ANOFFSET (section_offsets, SECT_OFF_TEXT); + type = N_TEXT; + } + else if (bfd_get_section_flags (abfd, sec) & SEC_DATA) + { + sym_value += ANOFFSET (section_offsets, SECT_OFF_DATA); + type = N_DATA; + } + else if (bfd_get_section_flags (abfd, sec) & SEC_ALLOC) + { + sym_value += ANOFFSET (section_offsets, SECT_OFF_BSS); + type = N_BSS; + } + else + continue; + + if (sym->flags & BSF_GLOBAL) + type |= N_EXT; + + record_minimal_symbol ((char *) bfd_asymbol_name (sym), sym_value, + type, objfile); + } + } + + /* Symbols from shared libraries have a dynamic relocation entry + that points to the associated slot in the procedure linkage table. + We make a mininal symbol table entry with type mst_solib_trampoline + at the address in the procedure linkage table. */ + dynrel_size = bfd_get_dynamic_reloc_upper_bound (abfd); + if (dynrel_size < 0) + { + do_cleanups (back_to); + return; + } + + dynrels = (arelent **) xmalloc (dynrel_size); + make_cleanup (free, dynrels); + + dynrel_count = bfd_canonicalize_dynamic_reloc (abfd, dynrels, dynsyms); + if (dynrel_count < 0) + { + do_cleanups (back_to); + return; + } + + for (counter = 0, relptr = dynrels; + counter < dynrel_count; + counter++, relptr++) + { + arelent *rel = *relptr; + CORE_ADDR address = + rel->address + ANOFFSET (section_offsets, SECT_OFF_DATA); + + switch (bfd_get_arch (abfd)) + { + case bfd_arch_sparc: + if (rel->howto->type != RELOC_JMP_SLOT) + continue; + break; + case bfd_arch_m68k: + /* `16' is the type BFD produces for a jump table relocation. */ + if (rel->howto->type != 16) + continue; + + /* Adjust address in the jump table to point to + the start of the bsr instruction. */ + address -= 2; + break; + default: + continue; + } + + name = (char *) bfd_asymbol_name (*rel->sym_ptr_ptr); + prim_record_minimal_symbol (name, address, mst_solib_trampoline, + objfile); + } + + do_cleanups (back_to); +} + +/* Given pointers to an a.out symbol table in core containing dbx + style data, setup partial_symtab's describing each source file for + which debugging information is available. + SYMFILE_NAME is the name of the file we are reading from + and SECTION_OFFSETS is the set of offsets for the various sections + of the file (a set of zeros if the mainline program). */ + +static void +read_dbx_symtab (section_offsets, objfile, text_addr, text_size) + struct section_offsets *section_offsets; + struct objfile *objfile; + CORE_ADDR text_addr; + int text_size; +{ + register struct external_nlist *bufp = 0; /* =0 avoids gcc -Wall glitch */ + struct internal_nlist nlist; + + register char *namestring; + int nsl; + int past_first_source_file = 0; + CORE_ADDR last_o_file_start = 0; + CORE_ADDR last_function_start = 0; + struct cleanup *back_to; + bfd *abfd; + int textlow_not_set; + + /* Current partial symtab */ + struct partial_symtab *pst; + + /* List of current psymtab's include files */ + char **psymtab_include_list; + int includes_allocated; + int includes_used; + + /* Index within current psymtab dependency list */ + struct partial_symtab **dependency_list; + int dependencies_used, dependencies_allocated; + + /* FIXME. We probably want to change stringtab_global rather than add this + while processing every symbol entry. FIXME. */ + file_string_table_offset = 0; + next_file_string_table_offset = 0; + + stringtab_global = DBX_STRINGTAB (objfile); + + pst = (struct partial_symtab *) 0; + + includes_allocated = 30; + includes_used = 0; + psymtab_include_list = (char **) alloca (includes_allocated * + sizeof (char *)); + + dependencies_allocated = 30; + dependencies_used = 0; + dependency_list = + (struct partial_symtab **) alloca (dependencies_allocated * + sizeof (struct partial_symtab *)); + + /* Init bincl list */ + init_bincl_list (20, objfile); + back_to = make_cleanup ((make_cleanup_func) free_bincl_list, objfile); + + last_source_file = NULL; + + lowest_text_address = (CORE_ADDR)-1; + + symfile_bfd = objfile->obfd; /* For next_text_symbol */ + abfd = objfile->obfd; + symbuf_end = symbuf_idx = 0; + next_symbol_text_func = dbx_next_symbol_text; + textlow_not_set = 1; + has_line_numbers = 0; + + for (symnum = 0; symnum < DBX_SYMCOUNT (objfile); symnum++) + { + /* Get the symbol for this run and pull out some info */ + QUIT; /* allow this to be interruptable */ + if (symbuf_idx == symbuf_end) + fill_symbuf (abfd); + bufp = &symbuf[symbuf_idx++]; + + /* + * Special case to speed up readin. + */ + if (bfd_h_get_8 (abfd, bufp->e_type) == N_SLINE) + { + has_line_numbers = 1; + continue; + } + + INTERNALIZE_SYMBOL (nlist, bufp, abfd); + OBJSTAT (objfile, n_stabs++); + + /* Ok. There is a lot of code duplicated in the rest of this + switch statement (for efficiency reasons). Since I don't + like duplicating code, I will do my penance here, and + describe the code which is duplicated: + + *) The assignment to namestring. + *) The call to strchr. + *) The addition of a partial symbol the the two partial + symbol lists. This last is a large section of code, so + I've imbedded it in the following macro. + */ + +/* Set namestring based on nlist. If the string table index is invalid, + give a fake name, and print a single error message per symbol file read, + rather than abort the symbol reading or flood the user with messages. */ + +/*FIXME: Too many adds and indirections in here for the inner loop. */ +#define SET_NAMESTRING()\ + if (((unsigned)CUR_SYMBOL_STRX + file_string_table_offset) >= \ + DBX_STRINGTAB_SIZE (objfile)) { \ + complain (&string_table_offset_complaint, symnum); \ + namestring = "<bad string table offset>"; \ + } else \ + namestring = CUR_SYMBOL_STRX + file_string_table_offset + \ + DBX_STRINGTAB (objfile) + +#define CUR_SYMBOL_TYPE nlist.n_type +#define CUR_SYMBOL_VALUE nlist.n_value +#define CUR_SYMBOL_STRX nlist.n_strx +#define DBXREAD_ONLY +#define START_PSYMTAB(ofile,secoff,fname,low,symoff,global_syms,static_syms)\ + start_psymtab(ofile, secoff, fname, low, symoff, global_syms, static_syms) +#define END_PSYMTAB(pst,ilist,ninc,c_off,c_text,dep_list,n_deps,textlow_not_set)\ + end_psymtab(pst,ilist,ninc,c_off,c_text,dep_list,n_deps,textlow_not_set) + +#include "partial-stab.h" + } + + /* If there's stuff to be cleaned up, clean it up. */ + if (DBX_SYMCOUNT (objfile) > 0 /* We have some syms */ +/*FIXME, does this have a bug at start address 0? */ + && last_o_file_start + && objfile -> ei.entry_point < nlist.n_value + && objfile -> ei.entry_point >= last_o_file_start) + { + objfile -> ei.entry_file_lowpc = last_o_file_start; + objfile -> ei.entry_file_highpc = nlist.n_value; + } + + if (pst) + { + /* Don't set pst->texthigh lower than it already is. */ + CORE_ADDR text_end = + (lowest_text_address == (CORE_ADDR)-1 + ? (text_addr + section_offsets->offsets[SECT_OFF_TEXT]) + : lowest_text_address) + + text_size; + + end_psymtab (pst, psymtab_include_list, includes_used, + symnum * symbol_size, + text_end > pst->texthigh ? text_end : pst->texthigh, + dependency_list, dependencies_used, textlow_not_set); + } + + do_cleanups (back_to); +} + +/* Allocate and partially fill a partial symtab. It will be + completely filled at the end of the symbol list. + + SYMFILE_NAME is the name of the symbol-file we are reading from, and ADDR + is the address relative to which its symbols are (incremental) or 0 + (normal). */ + + +struct partial_symtab * +start_psymtab (objfile, section_offsets, + filename, textlow, ldsymoff, global_syms, static_syms) + struct objfile *objfile; + struct section_offsets *section_offsets; + char *filename; + CORE_ADDR textlow; + int ldsymoff; + struct partial_symbol **global_syms; + struct partial_symbol **static_syms; +{ + struct partial_symtab *result = + start_psymtab_common(objfile, section_offsets, + filename, textlow, global_syms, static_syms); + + result->read_symtab_private = (char *) + obstack_alloc (&objfile -> psymbol_obstack, sizeof (struct symloc)); + LDSYMOFF(result) = ldsymoff; + result->read_symtab = dbx_psymtab_to_symtab; + SYMBOL_SIZE(result) = symbol_size; + SYMBOL_OFFSET(result) = symbol_table_offset; + STRING_OFFSET(result) = string_table_offset; + FILE_STRING_OFFSET(result) = file_string_table_offset; + + /* If we're handling an ELF file, drag some section-relocation info + for this source file out of the ELF symbol table, to compensate for + Sun brain death. This replaces the section_offsets in this psymtab, + if successful. */ + elfstab_offset_sections (objfile, result); + + /* Deduce the source language from the filename for this psymtab. */ + psymtab_language = deduce_language_from_filename (filename); + + return result; +} + +/* Close off the current usage of PST. + Returns PST or NULL if the partial symtab was empty and thrown away. + + FIXME: List variables and peculiarities of same. */ + +struct partial_symtab * +end_psymtab (pst, include_list, num_includes, capping_symbol_offset, + capping_text, dependency_list, number_dependencies, textlow_not_set) + struct partial_symtab *pst; + char **include_list; + int num_includes; + int capping_symbol_offset; + CORE_ADDR capping_text; + struct partial_symtab **dependency_list; + int number_dependencies; + int textlow_not_set; +{ + int i; + struct objfile *objfile = pst -> objfile; + + if (capping_symbol_offset != -1) + LDSYMLEN(pst) = capping_symbol_offset - LDSYMOFF(pst); + pst->texthigh = capping_text; + +#ifdef SOFUN_ADDRESS_MAYBE_MISSING + /* Under Solaris, the N_SO symbols always have a value of 0, + instead of the usual address of the .o file. Therefore, + we have to do some tricks to fill in texthigh and textlow. + The first trick is in partial-stab.h: if we see a static + or global function, and the textlow for the current pst + is not set (ie: textlow_not_set), then we use that function's + address for the textlow of the pst. */ + + /* Now, to fill in texthigh, we remember the last function seen + in the .o file (also in partial-stab.h). Also, there's a hack in + bfd/elf.c and gdb/elfread.c to pass the ELF st_size field + to here via the misc_info field. Therefore, we can fill in + a reliable texthigh by taking the address plus size of the + last function in the file. */ + + if (pst->texthigh == 0 && last_function_name) + { + char *p; + int n; + struct minimal_symbol *minsym; + + p = strchr (last_function_name, ':'); + if (p == NULL) + p = last_function_name; + n = p - last_function_name; + p = alloca (n + 2); + strncpy (p, last_function_name, n); + p[n] = 0; + + minsym = lookup_minimal_symbol (p, pst->filename, objfile); + if (minsym == NULL) + { + /* Sun Fortran appends an underscore to the minimal symbol name, + try again with an appended underscore if the minimal symbol + was not found. */ + p[n] = '_'; + p[n + 1] = 0; + minsym = lookup_minimal_symbol (p, pst->filename, objfile); + } + + if (minsym) + pst->texthigh = SYMBOL_VALUE_ADDRESS (minsym) + MSYMBOL_SIZE (minsym); + + last_function_name = NULL; + } + + /* this test will be true if the last .o file is only data */ + if (textlow_not_set) + pst->textlow = pst->texthigh; + else + { + struct partial_symtab *p1; + + /* If we know our own starting text address, then walk through all other + psymtabs for this objfile, and if any didn't know their ending text + address, set it to our starting address. Take care to not set our + own ending address to our starting address, nor to set addresses on + `dependency' files that have both textlow and texthigh zero. */ + + ALL_OBJFILE_PSYMTABS (objfile, p1) + { + if (p1->texthigh == 0 && p1->textlow != 0 && p1 != pst) + { + p1->texthigh = pst->textlow; + /* if this file has only data, then make textlow match texthigh */ + if (p1->textlow == 0) + p1->textlow = p1->texthigh; + } + } + } + + /* End of kludge for patching Solaris textlow and texthigh. */ +#endif /* SOFUN_ADDRESS_MAYBE_MISSING. */ + + pst->n_global_syms = + objfile->global_psymbols.next - (objfile->global_psymbols.list + pst->globals_offset); + pst->n_static_syms = + objfile->static_psymbols.next - (objfile->static_psymbols.list + pst->statics_offset); + + pst->number_of_dependencies = number_dependencies; + if (number_dependencies) + { + pst->dependencies = (struct partial_symtab **) + obstack_alloc (&objfile->psymbol_obstack, + number_dependencies * sizeof (struct partial_symtab *)); + memcpy (pst->dependencies, dependency_list, + number_dependencies * sizeof (struct partial_symtab *)); + } + else + pst->dependencies = 0; + + for (i = 0; i < num_includes; i++) + { + struct partial_symtab *subpst = + allocate_psymtab (include_list[i], objfile); + + subpst->section_offsets = pst->section_offsets; + subpst->read_symtab_private = + (char *) obstack_alloc (&objfile->psymbol_obstack, + sizeof (struct symloc)); + LDSYMOFF(subpst) = + LDSYMLEN(subpst) = + subpst->textlow = + subpst->texthigh = 0; + + /* We could save slight bits of space by only making one of these, + shared by the entire set of include files. FIXME-someday. */ + subpst->dependencies = (struct partial_symtab **) + obstack_alloc (&objfile->psymbol_obstack, + sizeof (struct partial_symtab *)); + subpst->dependencies[0] = pst; + subpst->number_of_dependencies = 1; + + subpst->globals_offset = + subpst->n_global_syms = + subpst->statics_offset = + subpst->n_static_syms = 0; + + subpst->readin = 0; + subpst->symtab = 0; + subpst->read_symtab = pst->read_symtab; + } + + sort_pst_symbols (pst); + + /* If there is already a psymtab or symtab for a file of this name, remove it. + (If there is a symtab, more drastic things also happen.) + This happens in VxWorks. */ + free_named_symtabs (pst->filename); + + if (num_includes == 0 + && number_dependencies == 0 + && pst->n_global_syms == 0 + && pst->n_static_syms == 0 + && has_line_numbers == 0) + { + /* Throw away this psymtab, it's empty. We can't deallocate it, since + it is on the obstack, but we can forget to chain it on the list. */ + /* Empty psymtabs happen as a result of header files which don't have + any symbols in them. There can be a lot of them. But this check + is wrong, in that a psymtab with N_SLINE entries but nothing else + is not empty, but we don't realize that. Fixing that without slowing + things down might be tricky. */ + + discard_psymtab (pst); + + /* Indicate that psymtab was thrown away. */ + pst = (struct partial_symtab *)NULL; + } + return pst; +} + +static void +dbx_psymtab_to_symtab_1 (pst) + struct partial_symtab *pst; +{ + struct cleanup *old_chain; + int i; + + if (!pst) + return; + + if (pst->readin) + { + fprintf_unfiltered (gdb_stderr, "Psymtab for %s already read in. Shouldn't happen.\n", + pst->filename); + return; + } + + /* Read in all partial symtabs on which this one is dependent */ + for (i = 0; i < pst->number_of_dependencies; i++) + if (!pst->dependencies[i]->readin) + { + /* Inform about additional files that need to be read in. */ + if (info_verbose) + { + fputs_filtered (" ", gdb_stdout); + wrap_here (""); + fputs_filtered ("and ", gdb_stdout); + wrap_here (""); + printf_filtered ("%s...", pst->dependencies[i]->filename); + wrap_here (""); /* Flush output */ + gdb_flush (gdb_stdout); + } + dbx_psymtab_to_symtab_1 (pst->dependencies[i]); + } + + if (LDSYMLEN(pst)) /* Otherwise it's a dummy */ + { + /* Init stuff necessary for reading in symbols */ + stabsread_init (); + buildsym_init (); + old_chain = make_cleanup ((make_cleanup_func) really_free_pendings, 0); + file_string_table_offset = FILE_STRING_OFFSET (pst); + symbol_size = SYMBOL_SIZE (pst); + + /* Read in this file's symbols */ + bfd_seek (pst->objfile->obfd, SYMBOL_OFFSET (pst), SEEK_SET); + read_ofile_symtab (pst); + sort_symtab_syms (pst->symtab); + + do_cleanups (old_chain); + } + + pst->readin = 1; +} + +/* Read in all of the symbols for a given psymtab for real. + Be verbose about it if the user wants that. */ + +static void +dbx_psymtab_to_symtab (pst) + struct partial_symtab *pst; +{ + bfd *sym_bfd; + + if (!pst) + return; + + if (pst->readin) + { + fprintf_unfiltered (gdb_stderr, "Psymtab for %s already read in. Shouldn't happen.\n", + pst->filename); + return; + } + + if (LDSYMLEN(pst) || pst->number_of_dependencies) + { + /* Print the message now, before reading the string table, + to avoid disconcerting pauses. */ + if (info_verbose) + { + printf_filtered ("Reading in symbols for %s...", pst->filename); + gdb_flush (gdb_stdout); + } + + sym_bfd = pst->objfile->obfd; + + next_symbol_text_func = dbx_next_symbol_text; + + dbx_psymtab_to_symtab_1 (pst); + + /* Match with global symbols. This only needs to be done once, + after all of the symtabs and dependencies have been read in. */ + scan_file_globals (pst->objfile); + + /* Finish up the debug error message. */ + if (info_verbose) + printf_filtered ("done.\n"); + } +} + +/* Read in a defined section of a specific object file's symbols. */ + +static void +read_ofile_symtab (pst) + struct partial_symtab *pst; +{ + register char *namestring; + register struct external_nlist *bufp; + struct internal_nlist nlist; + unsigned char type; + unsigned max_symnum; + register bfd *abfd; + struct objfile *objfile; + int sym_offset; /* Offset to start of symbols to read */ + int sym_size; /* Size of symbols to read */ + CORE_ADDR text_offset; /* Start of text segment for symbols */ + int text_size; /* Size of text segment for symbols */ + struct section_offsets *section_offsets; + + objfile = pst->objfile; + sym_offset = LDSYMOFF(pst); + sym_size = LDSYMLEN(pst); + text_offset = pst->textlow; + text_size = pst->texthigh - pst->textlow; + section_offsets = pst->section_offsets; + + current_objfile = objfile; + subfile_stack = NULL; + + stringtab_global = DBX_STRINGTAB (objfile); + last_source_file = NULL; + + abfd = objfile->obfd; + symfile_bfd = objfile->obfd; /* Implicit param to next_text_symbol */ + symbuf_end = symbuf_idx = 0; + + /* It is necessary to actually read one symbol *before* the start + of this symtab's symbols, because the GCC_COMPILED_FLAG_SYMBOL + occurs before the N_SO symbol. + + Detecting this in read_dbx_symtab + would slow down initial readin, so we look for it here instead. */ + if (!processing_acc_compilation && sym_offset >= (int)symbol_size) + { + bfd_seek (symfile_bfd, sym_offset - symbol_size, SEEK_CUR); + fill_symbuf (abfd); + bufp = &symbuf[symbuf_idx++]; + INTERNALIZE_SYMBOL (nlist, bufp, abfd); + OBJSTAT (objfile, n_stabs++); + + SET_NAMESTRING (); + + processing_gcc_compilation = 0; + if (nlist.n_type == N_TEXT) + { + const char *tempstring = namestring; + + if (STREQ (namestring, GCC_COMPILED_FLAG_SYMBOL)) + processing_gcc_compilation = 1; + else if (STREQ (namestring, GCC2_COMPILED_FLAG_SYMBOL)) + processing_gcc_compilation = 2; + if (tempstring[0] == bfd_get_symbol_leading_char (symfile_bfd)) + ++tempstring; + if (STREQN (tempstring, "__gnu_compiled", 14)) + processing_gcc_compilation = 2; + } + + /* Try to select a C++ demangling based on the compilation unit + producer. */ + + if (processing_gcc_compilation) + { + if (AUTO_DEMANGLING) + { + set_demangling_style (GNU_DEMANGLING_STYLE_STRING); + } + } + } + else + { + /* The N_SO starting this symtab is the first symbol, so we + better not check the symbol before it. I'm not this can + happen, but it doesn't hurt to check for it. */ + bfd_seek (symfile_bfd, sym_offset, SEEK_CUR); + processing_gcc_compilation = 0; + } + + if (symbuf_idx == symbuf_end) + fill_symbuf (abfd); + bufp = &symbuf[symbuf_idx]; + if (bfd_h_get_8 (abfd, bufp->e_type) != N_SO) + error("First symbol in segment of executable not a source symbol"); + + max_symnum = sym_size / symbol_size; + + for (symnum = 0; + symnum < max_symnum; + symnum++) + { + QUIT; /* Allow this to be interruptable */ + if (symbuf_idx == symbuf_end) + fill_symbuf(abfd); + bufp = &symbuf[symbuf_idx++]; + INTERNALIZE_SYMBOL (nlist, bufp, abfd); + OBJSTAT (objfile, n_stabs++); + + type = bfd_h_get_8 (abfd, bufp->e_type); + + SET_NAMESTRING (); + + if (type & N_STAB) { + process_one_symbol (type, nlist.n_desc, nlist.n_value, + namestring, section_offsets, objfile); + } + /* We skip checking for a new .o or -l file; that should never + happen in this routine. */ + else if (type == N_TEXT) + { + /* I don't think this code will ever be executed, because + the GCC_COMPILED_FLAG_SYMBOL usually is right before + the N_SO symbol which starts this source file. + However, there is no reason not to accept + the GCC_COMPILED_FLAG_SYMBOL anywhere. */ + + if (STREQ (namestring, GCC_COMPILED_FLAG_SYMBOL)) + processing_gcc_compilation = 1; + else if (STREQ (namestring, GCC2_COMPILED_FLAG_SYMBOL)) + processing_gcc_compilation = 2; + + if (AUTO_DEMANGLING) + { + set_demangling_style (GNU_DEMANGLING_STYLE_STRING); + } + } + else if (type & N_EXT || type == (unsigned char)N_TEXT + || type == (unsigned char)N_NBTEXT + ) { + /* Global symbol: see if we came across a dbx defintion for + a corresponding symbol. If so, store the value. Remove + syms from the chain when their values are stored, but + search the whole chain, as there may be several syms from + different files with the same name. */ + /* This is probably not true. Since the files will be read + in one at a time, each reference to a global symbol will + be satisfied in each file as it appears. So we skip this + section. */ + ; + } + } + + current_objfile = NULL; + + /* In a Solaris elf file, this variable, which comes from the + value of the N_SO symbol, will still be 0. Luckily, text_offset, + which comes from pst->textlow is correct. */ + if (last_source_start_addr == 0) + last_source_start_addr = text_offset; + + /* In reordered executables last_source_start_addr may not be the + lower bound for this symtab, instead use text_offset which comes + from pst->textlow which is correct. */ + if (last_source_start_addr > text_offset) + last_source_start_addr = text_offset; + + pst->symtab = end_symtab (text_offset + text_size, objfile, SECT_OFF_TEXT); + + /* Process items which we had to "process_later" due to dependancies + on other stabs. */ + process_now (objfile); + + end_stabs (); +} + + +/* This handles a single symbol from the symbol-file, building symbols + into a GDB symtab. It takes these arguments and an implicit argument. + + TYPE is the type field of the ".stab" symbol entry. + DESC is the desc field of the ".stab" entry. + VALU is the value field of the ".stab" entry. + NAME is the symbol name, in our address space. + SECTION_OFFSETS is a set of amounts by which the sections of this object + file were relocated when it was loaded into memory. + All symbols that refer + to memory locations need to be offset by these amounts. + OBJFILE is the object file from which we are reading symbols. + It is used in end_symtab. */ + +void +process_one_symbol (type, desc, valu, name, section_offsets, objfile) + int type, desc; + CORE_ADDR valu; + char *name; + struct section_offsets *section_offsets; + struct objfile *objfile; +{ +#ifdef SUN_FIXED_LBRAC_BUG + /* If SUN_FIXED_LBRAC_BUG is defined, then it tells us whether we need + to correct the address of N_LBRAC's. If it is not defined, then + we never need to correct the addresses. */ + + /* This records the last pc address we've seen. We depend on there being + an SLINE or FUN or SO before the first LBRAC, since the variable does + not get reset in between reads of different symbol files. */ + static CORE_ADDR last_pc_address; +#endif + + register struct context_stack *new; + /* This remembers the address of the start of a function. It is used + because in Solaris 2, N_LBRAC, N_RBRAC, and N_SLINE entries are + relative to the current function's start address. On systems + other than Solaris 2, this just holds the SECT_OFF_TEXT value, and is + used to relocate these symbol types rather than SECTION_OFFSETS. */ + static CORE_ADDR function_start_offset; + + /* If this is nonzero, we've seen a non-gcc N_OPT symbol for this source + file. Used to detect the SunPRO solaris compiler. */ + static int n_opt_found; + + /* The stab type used for the definition of the last function. + N_STSYM or N_GSYM for SunOS4 acc; N_FUN for other compilers. */ + static int function_stab_type = 0; + + if (!block_address_function_relative) + /* N_LBRAC, N_RBRAC and N_SLINE entries are not relative to the + function start address, so just use the text offset. */ + function_start_offset = ANOFFSET (section_offsets, SECT_OFF_TEXT); + + /* Something is wrong if we see real data before + seeing a source file name. */ + + if (last_source_file == NULL && type != (unsigned char)N_SO) + { + /* Ignore any symbols which appear before an N_SO symbol. + Currently no one puts symbols there, but we should deal + gracefully with the case. A complain()t might be in order, + but this should not be an error (). */ + return; + } + + switch (type) + { + case N_FUN: + case N_FNAME: + + if (*name == '\000') + { + /* This N_FUN marks the end of a function. This closes off the + current block. */ + within_function = 0; + new = pop_context (); + + /* Make a block for the local symbols within. */ + finish_block (new->name, &local_symbols, new->old_blocks, + new->start_addr, new->start_addr + valu, + objfile); + + /* May be switching to an assembler file which may not be using + block relative stabs, so reset the offset. */ + if (block_address_function_relative) + function_start_offset = 0; + + break; + } + + /* Relocate for dynamic loading */ + valu += ANOFFSET (section_offsets, SECT_OFF_TEXT); +#ifdef SMASH_TEXT_ADDRESS + SMASH_TEXT_ADDRESS (valu); +#endif + goto define_a_symbol; + + case N_LBRAC: + /* This "symbol" just indicates the start of an inner lexical + context within a function. */ + + /* Ignore extra outermost context from SunPRO cc and acc. */ + if (n_opt_found && desc == 1) + break; + + if (block_address_function_relative) + /* Relocate for Sun ELF acc fn-relative syms. */ + valu += function_start_offset; + else + /* On most machines, the block addresses are relative to the + N_SO, the linker did not relocate them (sigh). */ + valu += last_source_start_addr; + +#ifdef SUN_FIXED_LBRAC_BUG + if (!SUN_FIXED_LBRAC_BUG && valu < last_pc_address) { + /* Patch current LBRAC pc value to match last handy pc value */ + complain (&lbrac_complaint); + valu = last_pc_address; + } +#endif + new = push_context (desc, valu); + break; + + case N_RBRAC: + /* This "symbol" just indicates the end of an inner lexical + context that was started with N_LBRAC. */ + + /* Ignore extra outermost context from SunPRO cc and acc. */ + if (n_opt_found && desc == 1) + break; + + if (block_address_function_relative) + /* Relocate for Sun ELF acc fn-relative syms. */ + valu += function_start_offset; + else + /* On most machines, the block addresses are relative to the + N_SO, the linker did not relocate them (sigh). */ + valu += last_source_start_addr; + + new = pop_context(); + if (desc != new->depth) + complain (&lbrac_mismatch_complaint, symnum); + + /* Some compilers put the variable decls inside of an + LBRAC/RBRAC block. This macro should be nonzero if this + is true. DESC is N_DESC from the N_RBRAC symbol. + GCC_P is true if we've detected the GCC_COMPILED_SYMBOL + or the GCC2_COMPILED_SYMBOL. */ +#if !defined (VARIABLES_INSIDE_BLOCK) +#define VARIABLES_INSIDE_BLOCK(desc, gcc_p) 0 +#endif + + /* Can only use new->locals as local symbols here if we're in + gcc or on a machine that puts them before the lbrack. */ + if (!VARIABLES_INSIDE_BLOCK(desc, processing_gcc_compilation)) + local_symbols = new->locals; + + if (context_stack_depth + > !VARIABLES_INSIDE_BLOCK(desc, processing_gcc_compilation)) + { + /* This is not the outermost LBRAC...RBRAC pair in the function, + its local symbols preceded it, and are the ones just recovered + from the context stack. Define the block for them (but don't + bother if the block contains no symbols. Should we complain + on blocks without symbols? I can't think of any useful purpose + for them). */ + if (local_symbols != NULL) + { + /* Muzzle a compiler bug that makes end < start. (which + compilers? Is this ever harmful?). */ + if (new->start_addr > valu) + { + complain (&lbrac_rbrac_complaint); + new->start_addr = valu; + } + /* Make a block for the local symbols within. */ + finish_block (0, &local_symbols, new->old_blocks, + new->start_addr, valu, objfile); + } + } + else + { + /* This is the outermost LBRAC...RBRAC pair. There is no + need to do anything; leave the symbols that preceded it + to be attached to the function's own block. We need to + indicate that we just moved outside of the function. */ + within_function = 0; + } + + if (VARIABLES_INSIDE_BLOCK(desc, processing_gcc_compilation)) + /* Now pop locals of block just finished. */ + local_symbols = new->locals; + break; + + case N_FN: + case N_FN_SEQ: + /* This kind of symbol indicates the start of an object file. */ + /* Relocate for dynamic loading */ + valu += ANOFFSET (section_offsets, SECT_OFF_TEXT); + break; + + case N_SO: + /* This type of symbol indicates the start of data + for one source file. + Finish the symbol table of the previous source file + (if any) and start accumulating a new symbol table. */ + /* Relocate for dynamic loading */ + valu += ANOFFSET (section_offsets, SECT_OFF_TEXT); + + n_opt_found = 0; + +#ifdef SUN_FIXED_LBRAC_BUG + last_pc_address = valu; /* Save for SunOS bug circumcision */ +#endif + +#ifdef PCC_SOL_BROKEN + /* pcc bug, occasionally puts out SO for SOL. */ + if (context_stack_depth > 0) + { + start_subfile (name, NULL); + break; + } +#endif + if (last_source_file) + { + /* Check if previous symbol was also an N_SO (with some + sanity checks). If so, that one was actually the directory + name, and the current one is the real file name. + Patch things up. */ + if (previous_stab_code == (unsigned char) N_SO) + { + patch_subfile_names (current_subfile, name); + break; /* Ignore repeated SOs */ + } + end_symtab (valu, objfile, SECT_OFF_TEXT); + end_stabs (); + } + + /* Null name means this just marks the end of text for this .o file. + Don't start a new symtab in this case. */ + if (*name == '\000') + break; + + if (block_address_function_relative) + function_start_offset = 0; + + start_stabs (); + start_symtab (name, NULL, valu); + record_debugformat ("stabs"); + break; + + case N_SOL: + /* This type of symbol indicates the start of data for + a sub-source-file, one whose contents were copied or + included in the compilation of the main source file + (whose name was given in the N_SO symbol.) */ + /* Relocate for dynamic loading */ + valu += ANOFFSET (section_offsets, SECT_OFF_TEXT); + start_subfile (name, current_subfile->dirname); + break; + + case N_BINCL: + push_subfile (); + add_new_header_file (name, valu); + start_subfile (name, current_subfile->dirname); + break; + + case N_EINCL: + start_subfile (pop_subfile (), current_subfile->dirname); + break; + + case N_EXCL: + add_old_header_file (name, valu); + break; + + case N_SLINE: + /* This type of "symbol" really just records + one line-number -- core-address correspondence. + Enter it in the line list for this symbol table. */ + + /* Relocate for dynamic loading and for ELF acc fn-relative syms. */ + valu += function_start_offset; + +#ifdef SUN_FIXED_LBRAC_BUG + last_pc_address = valu; /* Save for SunOS bug circumcision */ +#endif + record_line (current_subfile, desc, valu); + break; + + case N_BCOMM: + common_block_start (name, objfile); + break; + + case N_ECOMM: + common_block_end (objfile); + break; + + /* The following symbol types need to have the appropriate offset added + to their value; then we process symbol definitions in the name. */ + + case N_STSYM: /* Static symbol in data seg */ + case N_LCSYM: /* Static symbol in BSS seg */ + case N_ROSYM: /* Static symbol in Read-only data seg */ + /* HORRID HACK DEPT. However, it's Sun's furgin' fault. + Solaris2's stabs-in-elf makes *most* symbols relative + but leaves a few absolute (at least for Solaris 2.1 and version + 2.0.1 of the SunPRO compiler). N_STSYM and friends sit on the fence. + .stab "foo:S...",N_STSYM is absolute (ld relocates it) + .stab "foo:V...",N_STSYM is relative (section base subtracted). + This leaves us no choice but to search for the 'S' or 'V'... + (or pass the whole section_offsets stuff down ONE MORE function + call level, which we really don't want to do). */ + { + char *p; + + /* .o files and NLMs have non-zero text seg offsets, but don't need + their static syms offset in this fashion. XXX - This is really a + crock that should be fixed in the solib handling code so that I + don't have to work around it here. */ + + if (!symfile_relocatable) + { + p = strchr (name, ':'); + if (p != 0 && p[1] == 'S') + { + /* The linker relocated it. We don't want to add an + elfstab_offset_sections-type offset, but we *do* want + to add whatever solib.c passed to symbol_file_add as + addr (this is known to affect SunOS4, and I suspect ELF + too). Since elfstab_offset_sections currently does not + muck with the text offset (there is no Ttext.text + symbol), we can get addr from the text offset. If + elfstab_offset_sections ever starts dealing with the + text offset, and we still need to do this, we need to + invent a SECT_OFF_ADDR_KLUDGE or something. */ + valu += ANOFFSET (section_offsets, SECT_OFF_TEXT); + goto define_a_symbol; + } + } + /* Since it's not the kludge case, re-dispatch to the right handler. */ + switch (type) { + case N_STSYM: goto case_N_STSYM; + case N_LCSYM: goto case_N_LCSYM; + case N_ROSYM: goto case_N_ROSYM; + default: abort(); + } + } + + case_N_STSYM: /* Static symbol in data seg */ + case N_DSLINE: /* Source line number, data seg */ + valu += ANOFFSET (section_offsets, SECT_OFF_DATA); + goto define_a_symbol; + + case_N_LCSYM: /* Static symbol in BSS seg */ + case N_BSLINE: /* Source line number, bss seg */ + /* N_BROWS: overlaps with N_BSLINE */ + valu += ANOFFSET (section_offsets, SECT_OFF_BSS); + goto define_a_symbol; + + case_N_ROSYM: /* Static symbol in Read-only data seg */ + valu += ANOFFSET (section_offsets, SECT_OFF_RODATA); + goto define_a_symbol; + + case N_ENTRY: /* Alternate entry point */ + /* Relocate for dynamic loading */ + valu += ANOFFSET (section_offsets, SECT_OFF_TEXT); + goto define_a_symbol; + + /* The following symbol types we don't know how to process. Handle + them in a "default" way, but complain to people who care. */ + default: + case N_CATCH: /* Exception handler catcher */ + case N_EHDECL: /* Exception handler name */ + case N_PC: /* Global symbol in Pascal */ + case N_M2C: /* Modula-2 compilation unit */ + /* N_MOD2: overlaps with N_EHDECL */ + case N_SCOPE: /* Modula-2 scope information */ + case N_ECOML: /* End common (local name) */ + case N_NBTEXT: /* Gould Non-Base-Register symbols??? */ + case N_NBDATA: + case N_NBBSS: + case N_NBSTS: + case N_NBLCS: + complain (&unknown_symtype_complaint, local_hex_string (type)); + /* FALLTHROUGH */ + + /* The following symbol types don't need the address field relocated, + since it is either unused, or is absolute. */ + define_a_symbol: + case N_GSYM: /* Global variable */ + case N_NSYMS: /* Number of symbols (ultrix) */ + case N_NOMAP: /* No map? (ultrix) */ + case N_RSYM: /* Register variable */ + case N_DEFD: /* Modula-2 GNU module dependency */ + case N_SSYM: /* Struct or union element */ + case N_LSYM: /* Local symbol in stack */ + case N_PSYM: /* Parameter variable */ + case N_LENG: /* Length of preceding symbol type */ + if (name) + { + int deftype; + char *colon_pos = strchr (name, ':'); + if (colon_pos == NULL) + deftype = '\0'; + else + deftype = colon_pos[1]; + + switch (deftype) + { + case 'f': + case 'F': + function_stab_type = type; + +#ifdef SOFUN_ADDRESS_MAYBE_MISSING + /* Deal with the SunPRO 3.0 compiler which omits the address + from N_FUN symbols. */ + if (type == N_FUN + && valu == ANOFFSET (section_offsets, SECT_OFF_TEXT)) + { + struct minimal_symbol *msym; + char *p; + int n; + + p = strchr (name, ':'); + if (p == NULL) + p = name; + n = p - name; + p = alloca (n + 2); + strncpy (p, name, n); + p[n] = 0; + + msym = lookup_minimal_symbol (p, last_source_file, + objfile); + if (msym == NULL) + { + /* Sun Fortran appends an underscore to the minimal + symbol name, try again with an appended underscore + if the minimal symbol was not found. */ + p[n] = '_'; + p[n + 1] = 0; + msym = lookup_minimal_symbol (p, last_source_file, + objfile); + } + if (msym) + valu = SYMBOL_VALUE_ADDRESS (msym); + } +#endif + +#ifdef SUN_FIXED_LBRAC_BUG + /* The Sun acc compiler, under SunOS4, puts out + functions with N_GSYM or N_STSYM. The problem is + that the address of the symbol is no good (for N_GSYM + it doesn't even attept an address; for N_STSYM it + puts out an address but then it gets relocated + relative to the data segment, not the text segment). + Currently we can't fix this up later as we do for + some types of symbol in scan_file_globals. + Fortunately we do have a way of finding the address - + we know that the value in last_pc_address is either + the one we want (if we're dealing with the first + function in an object file), or somewhere in the + previous function. This means that we can use the + minimal symbol table to get the address. */ + + /* Starting with release 3.0, the Sun acc compiler, + under SunOS4, puts out functions with N_FUN and a value + of zero. This gets relocated to the start of the text + segment of the module, which is no good either. + Under SunOS4 we can deal with this as N_SLINE and N_SO + entries contain valid absolute addresses. + Release 3.0 acc also puts out N_OPT entries, which makes + it possible to discern acc from cc or gcc. */ + + if (type == N_GSYM || type == N_STSYM + || (type == N_FUN + && n_opt_found && !block_address_function_relative)) + { + struct minimal_symbol *m; + int l = colon_pos - name; + + m = lookup_minimal_symbol_by_pc (last_pc_address); + if (m && STREQN (SYMBOL_NAME (m), name, l) + && SYMBOL_NAME (m) [l] == '\0') + /* last_pc_address was in this function */ + valu = SYMBOL_VALUE (m); + else if (m && SYMBOL_NAME (m+1) + && STREQN (SYMBOL_NAME (m+1), name, l) + && SYMBOL_NAME (m+1) [l] == '\0') + /* last_pc_address was in last function */ + valu = SYMBOL_VALUE (m+1); + else + /* Not found - use last_pc_address (for finish_block) */ + valu = last_pc_address; + } + + last_pc_address = valu; /* Save for SunOS bug circumcision */ +#endif + + if (block_address_function_relative) + /* For Solaris 2.0 compilers, the block addresses and + N_SLINE's are relative to the start of the + function. On normal systems, and when using gcc on + Solaris 2.0, these addresses are just absolute, or + relative to the N_SO, depending on + BLOCK_ADDRESS_ABSOLUTE. */ + function_start_offset = valu; + + within_function = 1; + if (context_stack_depth > 0) + { + new = pop_context (); + /* Make a block for the local symbols within. */ + finish_block (new->name, &local_symbols, new->old_blocks, + new->start_addr, valu, objfile); + } + /* Stack must be empty now. */ + if (context_stack_depth != 0) + complain (&lbrac_unmatched_complaint, symnum); + + new = push_context (0, valu); + new->name = define_symbol (valu, name, desc, type, objfile); + break; + + default: + define_symbol (valu, name, desc, type, objfile); + break; + } + } + break; + + /* We use N_OPT to carry the gcc2_compiled flag. Sun uses it + for a bunch of other flags, too. Someday we may parse their + flags; for now we ignore theirs and hope they'll ignore ours. */ + case N_OPT: /* Solaris 2: Compiler options */ + if (name) + { + if (STREQ (name, GCC2_COMPILED_FLAG_SYMBOL)) + { + processing_gcc_compilation = 2; +#if 1 /* Works, but is experimental. -fnf */ + if (AUTO_DEMANGLING) + { + set_demangling_style (GNU_DEMANGLING_STYLE_STRING); + } +#endif + } + else + n_opt_found = 1; + } + break; + + /* The following symbol types can be ignored. */ + case N_OBJ: /* Solaris 2: Object file dir and name */ + /* N_UNDF: Solaris 2: file separator mark */ + /* N_UNDF: -- we will never encounter it, since we only process one + file's symbols at once. */ + case N_ENDM: /* Solaris 2: End of module */ + case N_MAIN: /* Name of main routine. */ + case N_ALIAS: /* SunPro F77: alias name, ignore for now. */ + break; + } + + /* '#' is a GNU C extension to allow one symbol to refer to another + related symbol. + + Generally this is used so that an alias can refer to its main + symbol. */ + if (name[0] == '#') + { + /* Initialize symbol reference names and determine if this is + a definition. If symbol reference is being defined, go + ahead and add it. Otherwise, just return sym. */ + + char *s = name; + int refnum; + + /* If this stab defines a new reference ID that is not on the + reference list, then put it on the reference list. + + We go ahead and advance NAME past the reference, even though + it is not strictly necessary at this time. */ + refnum = symbol_reference_defined (&s); + if (refnum >= 0) + if (!ref_search (refnum)) + ref_add (refnum, 0, name, valu); + name = s; + } + + + previous_stab_code = type; +} + +/* FIXME: The only difference between this and elfstab_build_psymtabs + is the call to install_minimal_symbols for elf, and the support for + split sections. If the differences are really that small, the code + should be shared. */ + +/* Scan and build partial symbols for an coff symbol file. + The coff file has already been processed to get its minimal symbols. + + This routine is the equivalent of dbx_symfile_init and dbx_symfile_read + rolled into one. + + OBJFILE is the object file we are reading symbols from. + ADDR is the address relative to which the symbols are (e.g. + the base address of the text segment). + MAINLINE is true if we are reading the main symbol + table (as opposed to a shared lib or dynamically loaded file). + TEXTADDR is the address of the text section. + TEXTSIZE is the size of the text section. + STABSECTS is the list of .stab sections in OBJFILE. + STABSTROFFSET and STABSTRSIZE define the location in OBJFILE where the + .stabstr section exists. + + This routine is mostly copied from dbx_symfile_init and dbx_symfile_read, + adjusted for coff details. */ + +void +coffstab_build_psymtabs (objfile, section_offsets, mainline, + textaddr, textsize, stabsects, + stabstroffset, stabstrsize) + struct objfile *objfile; + struct section_offsets *section_offsets; + int mainline; + CORE_ADDR textaddr; + unsigned int textsize; + struct stab_section_list *stabsects; + file_ptr stabstroffset; + unsigned int stabstrsize; +{ + int val; + bfd *sym_bfd = objfile->obfd; + char *name = bfd_get_filename (sym_bfd); + struct dbx_symfile_info *info; + unsigned int stabsize; + + /* There is already a dbx_symfile_info allocated by our caller. + It might even contain some info from the coff symtab to help us. */ + info = objfile->sym_stab_info; + + DBX_TEXT_ADDR (objfile) = textaddr; + DBX_TEXT_SIZE (objfile) = textsize; + +#define COFF_STABS_SYMBOL_SIZE 12 /* XXX FIXME XXX */ + DBX_SYMBOL_SIZE (objfile) = COFF_STABS_SYMBOL_SIZE; + DBX_STRINGTAB_SIZE (objfile) = stabstrsize; + + if (stabstrsize > bfd_get_size (sym_bfd)) + error ("ridiculous string table size: %d bytes", stabstrsize); + DBX_STRINGTAB (objfile) = (char *) + obstack_alloc (&objfile->psymbol_obstack, stabstrsize+1); + OBJSTAT (objfile, sz_strtab += stabstrsize+1); + + /* Now read in the string table in one big gulp. */ + + val = bfd_seek (sym_bfd, stabstroffset, SEEK_SET); + if (val < 0) + perror_with_name (name); + val = bfd_read (DBX_STRINGTAB (objfile), stabstrsize, 1, sym_bfd); + if (val != stabstrsize) + perror_with_name (name); + + stabsread_new_init (); + buildsym_new_init (); + free_header_files (); + init_header_files (); + + processing_acc_compilation = 1; + + /* In a coff file, we've already installed the minimal symbols that came + from the coff (non-stab) symbol table, so always act like an + incremental load here. */ + if (stabsects->next == NULL) + { + stabsize = bfd_section_size (sym_bfd, stabsects->section); + DBX_SYMCOUNT (objfile) = stabsize / DBX_SYMBOL_SIZE (objfile); + DBX_SYMTAB_OFFSET (objfile) = stabsects->section->filepos; + } + else + { + struct stab_section_list *stabsect; + + DBX_SYMCOUNT (objfile) = 0; + for (stabsect = stabsects; stabsect != NULL; stabsect = stabsect->next) + { + stabsize = bfd_section_size (sym_bfd, stabsect->section); + DBX_SYMCOUNT (objfile) += stabsize / DBX_SYMBOL_SIZE (objfile); + } + + DBX_SYMTAB_OFFSET (objfile) = stabsects->section->filepos; + + symbuf_sections = stabsects->next; + symbuf_left = bfd_section_size (sym_bfd, stabsects->section); + symbuf_read = 0; + } + + dbx_symfile_read (objfile, section_offsets, 0); +} + +/* Scan and build partial symbols for an ELF symbol file. + This ELF file has already been processed to get its minimal symbols, + and any DWARF symbols that were in it. + + This routine is the equivalent of dbx_symfile_init and dbx_symfile_read + rolled into one. + + OBJFILE is the object file we are reading symbols from. + ADDR is the address relative to which the symbols are (e.g. + the base address of the text segment). + MAINLINE is true if we are reading the main symbol + table (as opposed to a shared lib or dynamically loaded file). + STABOFFSET and STABSIZE define the location in OBJFILE where the .stab + section exists. + STABSTROFFSET and STABSTRSIZE define the location in OBJFILE where the + .stabstr section exists. + + This routine is mostly copied from dbx_symfile_init and dbx_symfile_read, + adjusted for elf details. */ + +void +elfstab_build_psymtabs (objfile, section_offsets, mainline, + staboffset, stabsize, + stabstroffset, stabstrsize) + struct objfile *objfile; + struct section_offsets *section_offsets; + int mainline; + file_ptr staboffset; + unsigned int stabsize; + file_ptr stabstroffset; + unsigned int stabstrsize; +{ + int val; + bfd *sym_bfd = objfile->obfd; + char *name = bfd_get_filename (sym_bfd); + struct dbx_symfile_info *info; + asection *text_sect; + + /* There is already a dbx_symfile_info allocated by our caller. + It might even contain some info from the ELF symtab to help us. */ + info = objfile->sym_stab_info; + + text_sect = bfd_get_section_by_name (sym_bfd, ".text"); + if (!text_sect) + error ("Can't find .text section in symbol file"); + DBX_TEXT_ADDR (objfile) = bfd_section_vma (sym_bfd, text_sect); + DBX_TEXT_SIZE (objfile) = bfd_section_size (sym_bfd, text_sect); + +#define ELF_STABS_SYMBOL_SIZE 12 /* XXX FIXME XXX */ + DBX_SYMBOL_SIZE (objfile) = ELF_STABS_SYMBOL_SIZE; + DBX_SYMCOUNT (objfile) = stabsize / DBX_SYMBOL_SIZE (objfile); + DBX_STRINGTAB_SIZE (objfile) = stabstrsize; + DBX_SYMTAB_OFFSET (objfile) = staboffset; + + if (stabstrsize > bfd_get_size (sym_bfd)) + error ("ridiculous string table size: %d bytes", stabstrsize); + DBX_STRINGTAB (objfile) = (char *) + obstack_alloc (&objfile->psymbol_obstack, stabstrsize+1); + OBJSTAT (objfile, sz_strtab += stabstrsize+1); + + /* Now read in the string table in one big gulp. */ + + val = bfd_seek (sym_bfd, stabstroffset, SEEK_SET); + if (val < 0) + perror_with_name (name); + val = bfd_read (DBX_STRINGTAB (objfile), stabstrsize, 1, sym_bfd); + if (val != stabstrsize) + perror_with_name (name); + + stabsread_new_init (); + buildsym_new_init (); + free_header_files (); + init_header_files (); + install_minimal_symbols (objfile); + + processing_acc_compilation = 1; + + /* In an elf file, we've already installed the minimal symbols that came + from the elf (non-stab) symbol table, so always act like an + incremental load here. */ + dbx_symfile_read (objfile, section_offsets, 0); +} + +/* Scan and build partial symbols for a file with special sections for stabs + and stabstrings. The file has already been processed to get its minimal + symbols, and any other symbols that might be necessary to resolve GSYMs. + + This routine is the equivalent of dbx_symfile_init and dbx_symfile_read + rolled into one. + + OBJFILE is the object file we are reading symbols from. + ADDR is the address relative to which the symbols are (e.g. the base address + of the text segment). + MAINLINE is true if we are reading the main symbol table (as opposed to a + shared lib or dynamically loaded file). + STAB_NAME is the name of the section that contains the stabs. + STABSTR_NAME is the name of the section that contains the stab strings. + + This routine is mostly copied from dbx_symfile_init and dbx_symfile_read. */ + +void +stabsect_build_psymtabs (objfile, section_offsets, mainline, stab_name, + stabstr_name, text_name) + struct objfile *objfile; + struct section_offsets *section_offsets; + int mainline; + char *stab_name; + char *stabstr_name; + char *text_name; +{ + int val; + bfd *sym_bfd = objfile->obfd; + char *name = bfd_get_filename (sym_bfd); + asection *stabsect; + asection *stabstrsect; + asection *text_sect; + + stabsect = bfd_get_section_by_name (sym_bfd, stab_name); + stabstrsect = bfd_get_section_by_name (sym_bfd, stabstr_name); + + if (!stabsect) + return; + + if (!stabstrsect) + error ("stabsect_build_psymtabs: Found stabs (%s), but not string section (%s)", + stab_name, stabstr_name); + + objfile->sym_stab_info = (struct dbx_symfile_info *) + xmalloc (sizeof (struct dbx_symfile_info)); + memset (objfile->sym_stab_info, 0, sizeof (struct dbx_symfile_info)); + + text_sect = bfd_get_section_by_name (sym_bfd, text_name); + if (!text_sect) + error ("Can't find %s section in symbol file", text_name); + DBX_TEXT_ADDR (objfile) = bfd_section_vma (sym_bfd, text_sect); + DBX_TEXT_SIZE (objfile) = bfd_section_size (sym_bfd, text_sect); + + DBX_SYMBOL_SIZE (objfile) = sizeof (struct external_nlist); + DBX_SYMCOUNT (objfile) = bfd_section_size (sym_bfd, stabsect) + / DBX_SYMBOL_SIZE (objfile); + DBX_STRINGTAB_SIZE (objfile) = bfd_section_size (sym_bfd, stabstrsect); + DBX_SYMTAB_OFFSET (objfile) = stabsect->filepos; /* XXX - FIXME: POKING INSIDE BFD DATA STRUCTURES */ + + if (DBX_STRINGTAB_SIZE (objfile) > bfd_get_size (sym_bfd)) + error ("ridiculous string table size: %d bytes", DBX_STRINGTAB_SIZE (objfile)); + DBX_STRINGTAB (objfile) = (char *) + obstack_alloc (&objfile->psymbol_obstack, DBX_STRINGTAB_SIZE (objfile) + 1); + OBJSTAT (objfile, sz_strtab += DBX_STRINGTAB_SIZE (objfile) + 1); + + /* Now read in the string table in one big gulp. */ + + val = bfd_get_section_contents (sym_bfd, /* bfd */ + stabstrsect, /* bfd section */ + DBX_STRINGTAB (objfile), /* input buffer */ + 0, /* offset into section */ + DBX_STRINGTAB_SIZE (objfile)); /* amount to read */ + + if (!val) + perror_with_name (name); + + stabsread_new_init (); + buildsym_new_init (); + free_header_files (); + init_header_files (); + install_minimal_symbols (objfile); + + /* Now, do an incremental load */ + + processing_acc_compilation = 1; + dbx_symfile_read (objfile, section_offsets, 0); +} + +static struct sym_fns aout_sym_fns = +{ + bfd_target_aout_flavour, + dbx_new_init, /* sym_new_init: init anything gbl to entire symtab */ + dbx_symfile_init, /* sym_init: read initial info, setup for sym_read() */ + dbx_symfile_read, /* sym_read: read a symbol file into symtab */ + dbx_symfile_finish, /* sym_finish: finished with file, cleanup */ + default_symfile_offsets, + /* sym_offsets: parse user's offsets to internal form */ + NULL /* next: pointer to next struct sym_fns */ +}; + +void +_initialize_dbxread () +{ + add_symtab_fns(&aout_sym_fns); +} |