/* Generic symbol file reading for the GNU debugger, GDB. Copyright 1990, 1991 Free Software Foundation, Inc. Contributed by Cygnus Support, using pieces from other GDB modules. 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include "defs.h" #include "symtab.h" #include "gdbcore.h" #include "frame.h" #include "target.h" #include "value.h" #include "symfile.h" #include "gdbcmd.h" #include "breakpoint.h" #include #include #include #include #include #include CORE_ADDR entry_point; /* Where execution starts in symfile */ extern int info_verbose; extern void qsort (); extern char *getenv (); extern char *rindex (); extern CORE_ADDR startup_file_start; /* From blockframe.c */ extern CORE_ADDR startup_file_end; /* From blockframe.c */ /* Functions this file defines */ static struct objfile *symfile_open (); static struct sym_fns *symfile_init (); static void clear_symtab_users_once (); static void free_all_psymtabs (); static void free_all_symtabs (); /* List of all available sym_fns. */ struct sym_fns *symtab_fns = NULL; /* Saves the sym_fns of the current symbol table, so we can call the right XXX_new_init function when we free it. FIXME. This should be extended to calling the new_init function for each existing symtab or psymtab, since the main symbol file and subsequent added symbol files can have different types. */ static struct sym_fns *symfile_fns; /* Allocate an obstack to hold objects that should be freed when we load a new symbol table. This includes the symbols made by dbxread and the types that are not permanent. */ struct obstack obstack1; struct obstack *symbol_obstack = &obstack1; /* This obstack will be used for partial_symbol objects. It can probably actually be the same as the symbol_obstack above, but I'd like to keep them seperate for now. If I want to later, I'll replace one with the other. */ struct obstack obstack2; struct obstack *psymbol_obstack = &obstack2; /* The object file that the main symbol table was loaded from (e.g. the argument to the "symbol-file" or "file" command). */ struct objfile *symfile_objfile = 0; /* Structures with which to manage partial symbol allocation. */ struct psymbol_allocation_list global_psymbols = {0}, static_psymbols = {0}; /* Flag for whether user will be reloading symbols multiple times. Defaults to ON for VxWorks, otherwise OFF. */ #ifdef SYMBOL_RELOADING_DEFAULT int symbol_reloading = SYMBOL_RELOADING_DEFAULT; #else int symbol_reloading = 0; #endif /* Structure to manage complaints about symbol file contents. */ struct complaint complaint_root[1] = { {(char *)0, 0, complaint_root}, }; /* Some actual complaints. */ struct complaint oldsyms_complaint = { "Replacing old symbols for `%s'", 0, 0 }; struct complaint empty_symtab_complaint = { "Empty symbol table found for `%s'", 0, 0 }; /* In the following sort, we always make sure that register debug symbol declarations always come before regular debug symbol declarations (as might happen when parameters are then put into registers by the compiler). */ static int compare_symbols (s1, s2) struct symbol **s1, **s2; { register int namediff; /* Compare the initial characters. */ namediff = SYMBOL_NAME (*s1)[0] - SYMBOL_NAME (*s2)[0]; if (namediff != 0) return namediff; /* If they match, compare the rest of the names. */ namediff = strcmp (SYMBOL_NAME (*s1), SYMBOL_NAME (*s2)); if (namediff != 0) return namediff; /* For symbols of the same name, registers should come first. */ return ((SYMBOL_CLASS (*s2) == LOC_REGISTER) - (SYMBOL_CLASS (*s1) == LOC_REGISTER)); } /* Call sort_block_syms to sort alphabetically the symbols of one block. */ void sort_block_syms (b) register struct block *b; { qsort (&BLOCK_SYM (b, 0), BLOCK_NSYMS (b), sizeof (struct symbol *), compare_symbols); } /* Call sort_symtab_syms to sort alphabetically the symbols of each block of one symtab. */ void sort_symtab_syms (s) register struct symtab *s; { register struct blockvector *bv; int nbl; int i; register struct block *b; if (s == 0) return; bv = BLOCKVECTOR (s); nbl = BLOCKVECTOR_NBLOCKS (bv); for (i = 0; i < nbl; i++) { b = BLOCKVECTOR_BLOCK (bv, i); if (BLOCK_SHOULD_SORT (b)) sort_block_syms (b); } } void sort_all_symtab_syms () { register struct symtab *s; for (s = symtab_list; s; s = s->next) { sort_symtab_syms (s); } } /* Make a copy of the string at PTR with SIZE characters in the symbol obstack (and add a null character at the end in the copy). Returns the address of the copy. */ char * obsavestring (ptr, size) char *ptr; int size; { register char *p = (char *) obstack_alloc (symbol_obstack, size + 1); /* Open-coded bcopy--saves function call time. These strings are usually short. */ { register char *p1 = ptr; register char *p2 = p; char *end = ptr + size; while (p1 != end) *p2++ = *p1++; } p[size] = 0; return p; } /* Concatenate strings S1, S2 and S3; return the new string. Space is found in the symbol_obstack. */ char * obconcat (s1, s2, s3) char *s1, *s2, *s3; { register int len = strlen (s1) + strlen (s2) + strlen (s3) + 1; register char *val = (char *) obstack_alloc (symbol_obstack, len); strcpy (val, s1); strcat (val, s2); strcat (val, s3); return val; } /* Accumulate the misc functions in bunches of 127. At the end, copy them all into one newly allocated structure. */ #define MISC_BUNCH_SIZE 127 struct misc_bunch { struct misc_bunch *next; struct misc_function contents[MISC_BUNCH_SIZE]; }; /* Bunch currently being filled up. The next field points to chain of filled bunches. */ static struct misc_bunch *misc_bunch; /* Number of slots filled in current bunch. */ static int misc_bunch_index; /* Total number of misc functions recorded so far. */ static int misc_count; void init_misc_bunches () { misc_count = 0; misc_bunch = 0; misc_bunch_index = MISC_BUNCH_SIZE; } void prim_record_misc_function (name, address, misc_type) char *name; CORE_ADDR address; enum misc_function_type misc_type; { register struct misc_bunch *new; if (misc_bunch_index == MISC_BUNCH_SIZE) { new = (struct misc_bunch *) xmalloc (sizeof (struct misc_bunch)); misc_bunch_index = 0; new->next = misc_bunch; misc_bunch = new; } misc_bunch->contents[misc_bunch_index].name = name; misc_bunch->contents[misc_bunch_index].address = address; misc_bunch->contents[misc_bunch_index].type = misc_type; misc_bunch->contents[misc_bunch_index].misc_info = 0; misc_bunch_index++; misc_count++; } static int compare_misc_functions (fn1, fn2) struct misc_function *fn1, *fn2; { /* Return a signed result based on unsigned comparisons so that we sort into unsigned numeric order. */ if (fn1->address < fn2->address) return -1; if (fn1->address > fn2->address) return 1; return 0; } /* ARGSUSED */ void discard_misc_bunches (foo) int foo; { register struct misc_bunch *next; while (misc_bunch) { next = misc_bunch->next; free (misc_bunch); misc_bunch = next; } } /* After adding things to the vector, sort or re-sort it into address order. */ void sort_misc_function_vector () { qsort (misc_function_vector, misc_function_count, sizeof (struct misc_function), compare_misc_functions); } /* Compact duplicate entries out of the misc function vector by walking through the vector and compacting out entries with duplicate addresses and matching names. When files contain multiple sources of symbol information, it is possible for the misc function vector to contain many duplicate entries. As an example, SVR4 systems use ELF formatted object files, which usually contain at least two different types of symbol tables (a standard ELF one and a smaller dynamic linking table), as well as DWARF debugging information for files compiled with -g. Without compacting, the misc function vector for gdb itself contains over a 1000 duplicates, about a third of the total table size. Aside from the potential trap of not noticing that two successive entries identify the same location, this duplication impacts the time required to linearly scan the table, which is done in a number of places. So just do one linear scan here and toss out the duplicates. Note that the strings themselves are allocated on the symbol_obstack, so we can't easily reclaim their memory. They will get automatically freed when the symbol table is freed. Also note we only go up to the next to last entry within the loop and then copy the last entry explicitly after the loop terminates. Since the different sources of information for each symbol may have different levels of "completeness", we may have duplicates that have one entry with type "mf_unknown" and the other with a known type. So if the one we are leaving alone has type mf_unknown, overwrite it's type with the type from the one we are compacting out. */ static void compact_misc_function_vector () { struct misc_function *copyfrom; struct misc_function *copyto; copyfrom = copyto = misc_function_vector; while (copyfrom < misc_function_vector + misc_function_count - 1) { if (copyfrom -> address == (copyfrom + 1) -> address && (strcmp (copyfrom -> name, (copyfrom + 1) -> name) == 0)) { if ((copyfrom + 1) -> type == mf_unknown) { (copyfrom + 1) -> type = copyfrom -> type; } copyfrom++; } else { *copyto++ = *copyfrom++; } } *copyto++ = *copyfrom++; misc_function_count = copyto - misc_function_vector; misc_function_vector = (struct misc_function *) xrealloc (misc_function_vector, misc_function_count * sizeof (struct misc_function)); } /* INCLINK nonzero means bunches are from an incrementally-linked file. Add them to the existing bunches. Otherwise INCLINK is zero, and we start from scratch. */ void condense_misc_bunches (inclink) int inclink; { register int i, j; register struct misc_bunch *bunch; if (inclink) { misc_function_vector = (struct misc_function *) xrealloc (misc_function_vector, (misc_count + misc_function_count) * sizeof (struct misc_function)); j = misc_function_count; } else { misc_function_vector = (struct misc_function *) xmalloc (misc_count * sizeof (struct misc_function)); j = 0; } bunch = misc_bunch; while (bunch) { for (i = 0; i < misc_bunch_index; i++, j++) { misc_function_vector[j] = bunch->contents[i]; #ifdef NAMES_HAVE_UNDERSCORE if (misc_function_vector[j].name[0] == '_') misc_function_vector[j].name++; #endif #ifdef SOME_NAMES_HAVE_DOT if (misc_function_vector[j].name[0] == '.') misc_function_vector[j].name++; #endif } bunch = bunch->next; misc_bunch_index = MISC_BUNCH_SIZE; } if (misc_function_count + misc_count != j) /* DEBUG */ printf_filtered ("Function counts are off! %d + %d != %d\n", misc_function_count, misc_count, j); misc_function_count = j; /* Sort the misc functions by address. */ sort_misc_function_vector (); /* Compact out any duplicates. */ compact_misc_function_vector (); } /* Get the symbol table that corresponds to a partial_symtab. This is fast after the first time you do it. In fact, there is an even faster macro PSYMTAB_TO_SYMTAB that does the fast case inline. */ struct symtab * psymtab_to_symtab (pst) register struct partial_symtab *pst; { /* If it's been looked up before, return it. */ if (pst->symtab) return pst->symtab; /* If it has not yet been read in, read it. */ if (!pst->readin) { (*pst->read_symtab) (pst); } return pst->symtab; } /* Process a symbol file, as either the main file or as a dynamically loaded file. NAME is the file name (which will be tilde-expanded and made absolute herein) (but we don't free or modify NAME itself). FROM_TTY says how verbose to be. MAINLINE specifies whether this is the main symbol file, or whether it's an extra symbol file such as dynamically loaded code. If !mainline, ADDR is the address where the text segment was loaded. */ void syms_from_objfile (objfile, addr, mainline) struct objfile *objfile; CORE_ADDR addr; int mainline; { asection *text_sect; struct sym_fns *sf; bfd *sym_bfd = objfile->obfd; /* There is a distinction between having no symbol table (we refuse to read the file, leaving the old set of symbols around) and having no debugging symbols in your symbol table (we read the file and end up with a mostly empty symbol table). */ if (!(bfd_get_file_flags (sym_bfd) & HAS_SYMS)) return; /* Save startup file's range of PC addresses to help blockframe.c decide where the bottom of the stack is. */ if (bfd_get_file_flags (sym_bfd) & EXEC_P) { /* Executable file -- record its entry point so we'll recognize the startup file because it contains the entry point. */ entry_point = bfd_get_start_address (sym_bfd); } else { /* Examination of non-executable.o files. Short-circuit this stuff. */ /* ~0 will not be in any file, we hope. */ entry_point = ~0; /* set the startup file to be an empty range. */ startup_file_start = 0; startup_file_end = 0; } sf = symfile_init (objfile); if (mainline) { /* Since no error yet, throw away the old symbol table. */ if (symfile_objfile) free_objfile (symfile_objfile); symfile_objfile = 0; (*sf->sym_new_init) (); /* For mainline, caller didn't know the specified address of the text section. We fix that here. */ text_sect = bfd_get_section_by_name (sym_bfd, ".text"); addr = bfd_section_vma (sym_bfd, text_sect); } clear_complaints(); /* Allow complaints to appear for this new file. */ (*sf->sym_read) (sf, addr, mainline); /* Don't allow char * to have a typename (else would get caddr_t.) */ /* Ditto void *. FIXME should do this for all the builtin types. */ TYPE_NAME (lookup_pointer_type (builtin_type_char)) = 0; TYPE_NAME (lookup_pointer_type (builtin_type_void)) = 0; if (mainline) { /* OK, make it the "real" symbol file. */ symfile_objfile = objfile; symfile_fns = sf; } /* If we have wiped out any old symbol tables, clean up. */ clear_symtab_users_once (); } /* Process a symbol file, as either the main file or as a dynamically loaded file. NAME is the file name (which will be tilde-expanded and made absolute herein) (but we don't free or modify NAME itself). FROM_TTY says how verbose to be. MAINLINE specifies whether this is the main symbol file, or whether it's an extra symbol file such as dynamically loaded code. If !mainline, ADDR is the address where the text segment was loaded. */ void symbol_file_add (name, from_tty, addr, mainline) char *name; int from_tty; CORE_ADDR addr; int mainline; { struct objfile *objfile; bfd *sym_bfd; objfile = symfile_open (name); sym_bfd = objfile->obfd; /* There is a distinction between having no symbol table (we refuse to read the file, leaving the old set of symbols around) and having no debugging symbols in your symbol table (we read the file and end up with a mostly empty symbol table, but with lots of stuff in the misc function vector). */ if (!(bfd_get_file_flags (sym_bfd) & HAS_SYMS)) { error ("%s has no symbol-table", name); } if ((symtab_list || partial_symtab_list) && mainline && from_tty && !query ("Load new symbol table from \"%s\"? ", name)) error ("Not confirmed."); if (from_tty) { printf_filtered ("Reading symbols from %s...", name); wrap_here (""); fflush (stdout); } syms_from_objfile (objfile, addr, mainline); if (from_tty) { printf_filtered ("done.\n"); fflush (stdout); } } /* This is the symbol-file command. Read the file, analyze its symbols, and add a struct symtab to symtab_list. */ void symbol_file_command (name, from_tty) char *name; int from_tty; { dont_repeat (); if (name == 0) { if (symfile_objfile) { if ((symtab_list || partial_symtab_list) && from_tty && !query ("Discard symbol table from `%s'? ", symfile_objfile->name)) error ("Not confirmed."); free_objfile (symfile_objfile); } symfile_objfile = 0; /* FIXME, this does not account for the main file and subsequent files (shared libs, dynloads, etc) having different formats. It only calls the cleanup routine for the main file's format. */ if (symfile_fns) { (*symfile_fns->sym_new_init) (); free (symfile_fns); symfile_fns = 0; } return; } /* Getting new symbols may change our opinion about what is frameless. */ reinit_frame_cache (); symbol_file_add (name, from_tty, (CORE_ADDR)0, 1); } /* Open NAME and hand it off to BFD for preliminary analysis. Result is newly malloc'd struct objfile *, which includes a newly malloc'd` copy of NAME (tilde-expanded and made absolute). In case of trouble, error() is called. */ static struct objfile * symfile_open (name) char *name; { bfd *sym_bfd; int desc; char *absolute_name; struct objfile *objfile; name = tilde_expand (name); /* Returns 1st new malloc'd copy */ /* Look down path for it, allocate 2nd new malloc'd copy. */ desc = openp (getenv ("PATH"), 1, name, O_RDONLY, 0, &absolute_name); if (desc < 0) { make_cleanup (free, name); perror_with_name (name); } free (name); /* Free 1st new malloc'd copy */ name = absolute_name; /* Keep 2nd malloc'd copy in objfile and bfd */ sym_bfd = bfd_fdopenr (name, NULL, desc); if (!sym_bfd) { close (desc); make_cleanup (free, name); error ("Could not open `%s' to read symbols: %s", name, bfd_errmsg (bfd_error)); } if (!bfd_check_format (sym_bfd, bfd_object)) { bfd_close (sym_bfd); /* This also closes desc */ make_cleanup (free, name); error ("\"%s\": can't read symbols: %s.", name, bfd_errmsg (bfd_error)); } objfile = allocate_objfile (sym_bfd, name); return objfile; } /* Allocate a new objfile struct, fill it in as best we can, and return it. FIXME-soon! Eventually, the objfile will contain the obstack in which the symtabs and psymtabs are contained, so they can all be blown away cheaply and easily. */ struct objfile * allocate_objfile (abfd, filename) bfd *abfd; char *filename; { struct objfile *objfile; objfile = (struct objfile *) xmalloc (sizeof (struct objfile)); bzero (objfile, sizeof (*objfile)); objfile->obfd = abfd; objfile->name = filename; objfile->symtabs = 0; /* Don't have any yet */ objfile->psymtabs = 0; /* Don't have any yet */ objfile->mtime = bfd_get_mtime (abfd); /* Chain it to the list. */ objfile->next = object_files; object_files = objfile; return objfile; } /* Destroy an objfile and all the symtabs and psymtabs under it. */ void free_objfile (objfile) struct objfile *objfile; { struct objfile *ofp; if (objfile->name) free (objfile->name); if (objfile->obfd) bfd_close (objfile->obfd); /* Remove it from the chain of all objfiles. */ if (object_files == objfile) object_files = objfile->next; else for (ofp = object_files; ofp; ofp = ofp->next) { if (ofp->next == objfile) ofp->next = objfile->next; } /* FIXME! This should only free those associated with the objfile being passed to us. THIS IS A KLUDGE TO BOOTSTRAP US. */ free_all_psymtabs (); free_all_symtabs (); free (objfile); } /* Link a new symtab_fns into the global symtab_fns list. Called by various _initialize routines. */ void add_symtab_fns (sf) struct sym_fns *sf; { sf->next = symtab_fns; symtab_fns = sf; } /* Initialize to read symbols from the symbol file sym_bfd. It either returns or calls error(). The result is a malloc'd struct sym_fns that contains cached information about the symbol file. */ static struct sym_fns * symfile_init (objfile) struct objfile *objfile; { struct sym_fns *sf, *sf2; bfd *sym_bfd = objfile->obfd; for (sf = symtab_fns; sf != NULL; sf = sf->next) { if (!strncmp (bfd_get_target (sym_bfd), sf->sym_name, sf->sym_namelen)) { sf2 = (struct sym_fns *)xmalloc (sizeof (*sf2)); /* FIXME, who frees this? */ *sf2 = *sf; sf2->objfile = objfile; sf2->sym_bfd = sym_bfd; sf2->sym_private = 0; /* Not alloc'd yet */ (*sf2->sym_init) (sf2); return sf2; } } error ("I'm sorry, Dave, I can't do that. Symbol format `%s' unknown.", bfd_get_target (sym_bfd)); return 0; /* Appease lint. */ } /* This function runs the load command of our current target. */ void load_command (arg, from_tty) char *arg; int from_tty; { target_load (arg, from_tty); } /* This function allows the addition of incrementally linked object files. It does not modify any state in the target, only in the debugger. */ /* ARGSUSED */ void add_symbol_file_command (arg_string, from_tty) char *arg_string; int from_tty; { char *name; CORE_ADDR text_addr; /* Getting new symbols may change our opinion about what is frameless. */ reinit_frame_cache (); if (arg_string == 0) error ("add-symbol-file takes a file name and an address"); arg_string = tilde_expand (arg_string); make_cleanup (free, arg_string); for( ; *arg_string == ' '; arg_string++ ); name = arg_string; for( ; *arg_string && *arg_string != ' ' ; arg_string++ ); *arg_string++ = (char) 0; if (name[0] == 0) error ("add-symbol-file takes a file name and an address"); text_addr = parse_and_eval_address (arg_string); dont_repeat (); if (!query ("add symbol table from file \"%s\" at text_addr = %s?\n", name, local_hex_string (text_addr))) error ("Not confirmed."); symbol_file_add (name, 0, text_addr, 0); } /* Re-read symbols if a symbol-file has changed. */ void reread_symbols () { struct objfile *objfile; long new_modtime; int reread_one = 0; /* With the addition of shared libraries, this should be modified, the load time should be saved in the partial symbol tables, since different tables may come from different source files. FIXME. This routine should then walk down each partial symbol table and see if the symbol table that it originates from has been changed */ for (objfile = object_files; objfile; objfile = objfile->next) { if (objfile->obfd) { objfile->obfd->mtime_set = false; /* Force it to reread. */ new_modtime = bfd_get_mtime (objfile->obfd); if (new_modtime != objfile->mtime) { printf_filtered ("`%s' has changed; re-reading symbols.\n", objfile->name); /* FIXME, this should use a different command...that would only affect this objfile's symbols. */ symbol_file_command (objfile->name, 0); objfile->mtime = new_modtime; reread_one = 1; } } } if (reread_one) breakpoint_re_set (); } /* This function is really horrible, but to avoid it, there would need to be more filling in of forward references. */ void fill_in_vptr_fieldno (type) struct type *type; { if (TYPE_VPTR_FIELDNO (type) < 0) { int i; for (i = 1; i < TYPE_N_BASECLASSES (type); i++) { fill_in_vptr_fieldno (TYPE_BASECLASS (type, i)); if (TYPE_VPTR_FIELDNO (TYPE_BASECLASS (type, i)) >= 0) { TYPE_VPTR_FIELDNO (type) = TYPE_VPTR_FIELDNO (TYPE_BASECLASS (type, i)); TYPE_VPTR_BASETYPE (type) = TYPE_VPTR_BASETYPE (TYPE_BASECLASS (type, i)); break; } } } } /* Functions to handle complaints during symbol reading. */ /* How many complaints about a particular thing should be printed before we stop whining about it? Default is no whining at all, since so many systems have ill-constructed symbol files. */ static unsigned stop_whining = 0; /* Print a complaint about the input symbols, and link the complaint block into a chain for later handling. */ void complain (complaint, val) struct complaint *complaint; char *val; { complaint->counter++; if (complaint->next == 0) { complaint->next = complaint_root->next; complaint_root->next = complaint; } if (complaint->counter > stop_whining) return; wrap_here (""); if (!info_verbose) { puts_filtered ("During symbol reading..."); } printf_filtered (complaint->message, val); puts_filtered ("..."); wrap_here(""); if (!info_verbose) puts_filtered ("\n"); } /* Clear out all complaint counters that have ever been incremented. */ void clear_complaints () { struct complaint *p; for (p = complaint_root->next; p != complaint_root; p = p->next) p->counter = 0; } enum language deduce_language_from_filename (filename) char *filename; { char *c = rindex (filename, '.'); if (!c) ; /* Get default. */ else if(!strcmp(c,".mod")) return language_m2; else if(!strcmp(c,".c")) return language_c; else if(!strcmp(c,".cc") || !strcmp(c,".C")) return language_cplus; return language_unknown; /* default */ } /* allocate_symtab: Allocate and partly initialize a new symbol table. Return a pointer to it. error() if no space. Caller must set these fields: LINETABLE(symtab) symtab->blockvector symtab->dirname symtab->free_code symtab->free_ptr initialize any EXTRA_SYMTAB_INFO possibly free_named_symtabs (symtab->filename); symtab->next = symtab_list; symtab_list = symtab; */ struct symtab * allocate_symtab(name, objfile) char *name; struct objfile *objfile; { register struct symtab *symtab; symtab = (struct symtab *) xmalloc (sizeof (struct symtab)); bzero (symtab, sizeof (*symtab)); symtab->filename = name; symtab->fullname = NULL; symtab->nlines = 0; symtab->line_charpos = 0; symtab->version = 0; symtab->language = deduce_language_from_filename (name); /* Hook it to the objfile it comes from */ symtab->objfile = objfile; symtab->objfile_chain = objfile->symtabs; objfile->symtabs = symtab; #ifdef INIT_EXTRA_SYMTAB_INFO INIT_EXTRA_SYMTAB_INFO(symtab); #endif return symtab; } /* clear_symtab_users_once: This function is run after symbol reading, or from a cleanup. If an old symbol table was obsoleted, the old symbol table has been blown away, but the other GDB data structures that may reference it have not yet been cleared or re-directed. (The old symtab was zapped, and the cleanup queued, in free_named_symtab() below.) This function can be queued N times as a cleanup, or called directly; it will do all the work the first time, and then will be a no-op until the next time it is queued. This works by bumping a counter at queueing time. Much later when the cleanup is run, or at the end of symbol processing (in case the cleanup is discarded), if the queued count is greater than the "done-count", we do the work and set the done-count to the queued count. If the queued count is less than or equal to the done-count, we just ignore the call. This is needed because reading a single .o file will often replace many symtabs (one per .h file, for example), and we don't want to reset the breakpoints N times in the user's face. The reason we both queue a cleanup, and call it directly after symbol reading, is because the cleanup protects us in case of errors, but is discarded if symbol reading is successful. */ static int clear_symtab_users_queued; static int clear_symtab_users_done; static void clear_symtab_users_once () { /* Enforce once-per-`do_cleanups'-semantics */ if (clear_symtab_users_queued <= clear_symtab_users_done) return; clear_symtab_users_done = clear_symtab_users_queued; printf ("Resetting debugger state after updating old symbol tables\n"); /* Someday, we should do better than this, by only blowing away the things that really need to be blown. */ clear_value_history (); clear_displays (); clear_internalvars (); breakpoint_re_set (); set_default_breakpoint (0, 0, 0, 0); current_source_symtab = 0; } /* Delete the specified psymtab, and any others that reference it. */ static void cashier_psymtab (pst) struct partial_symtab *pst; { struct partial_symtab *ps, *pprev; int i; /* Find its previous psymtab in the chain */ for (ps = partial_symtab_list; ps; ps = ps->next) { if (ps == pst) break; pprev = ps; } if (ps) { /* Unhook it from the chain. */ if (ps == partial_symtab_list) partial_symtab_list = ps->next; else pprev->next = ps->next; /* FIXME, we can't conveniently deallocate the entries in the partial_symbol lists (global_psymbols/static_psymbols) that this psymtab points to. These just take up space until all the psymtabs are reclaimed. Ditto the dependencies list and filename, which are all in the psymbol_obstack. */ /* We need to cashier any psymtab that has this one as a dependency... */ again: for (ps = partial_symtab_list; ps; ps = ps->next) { for (i = 0; i < ps->number_of_dependencies; i++) { if (ps->dependencies[i] == pst) { cashier_psymtab (ps); goto again; /* Must restart, chain has been munged. */ } } } } } /* If a symtab or psymtab for filename NAME is found, free it along with any dependent breakpoints, displays, etc. Used when loading new versions of object modules with the "add-file" command. This is only called on the top-level symtab or psymtab's name; it is not called for subsidiary files such as .h files. Return value is 1 if we blew away the environment, 0 if not. FIXME. I think this is not the best way to do this. We should work on being gentler to the environment while still cleaning up all stray pointers into the freed symtab. */ int free_named_symtabs (name) char *name; { register struct symtab *s; register struct symtab *prev; register struct partial_symtab *ps; struct blockvector *bv; int blewit = 0; /* We only wack things if the symbol-reload switch is set. */ if (!symbol_reloading) return 0; /* Some symbol formats have trouble providing file names... */ if (name == 0 || *name == '\0') return 0; /* Look for a psymtab with the specified name. */ again2: for (ps = partial_symtab_list; ps; ps = ps->next) { if (!strcmp (name, ps->filename)) { cashier_psymtab (ps); /* Blow it away...and its little dog, too. */ goto again2; /* Must restart, chain has been munged */ } } /* Look for a symtab with the specified name. */ for (s = symtab_list; s; s = s->next) { if (!strcmp (name, s->filename)) break; prev = s; } if (s) { if (s == symtab_list) symtab_list = s->next; else prev->next = s->next; /* For now, queue a delete for all breakpoints, displays, etc., whether or not they depend on the symtab being freed. This should be changed so that only those data structures affected are deleted. */ /* But don't delete anything if the symtab is empty. This test is necessary due to a bug in "dbxread.c" that causes empty symtabs to be created for N_SO symbols that contain the pathname of the object file. (This problem has been fixed in GDB 3.9x). */ bv = BLOCKVECTOR (s); if (BLOCKVECTOR_NBLOCKS (bv) > 2 || BLOCK_NSYMS (BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK)) || BLOCK_NSYMS (BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK))) { complain (&oldsyms_complaint, name); clear_symtab_users_queued++; make_cleanup (clear_symtab_users_once, 0); blewit = 1; } else { complain (&empty_symtab_complaint, name); } free_symtab (s); } else { /* It is still possible that some breakpoints will be affected even though no symtab was found, since the file might have been compiled without debugging, and hence not be associated with a symtab. In order to handle this correctly, we would need to keep a list of text address ranges for undebuggable files. For now, we do nothing, since this is a fairly obscure case. */ ; } /* FIXME, what about the misc function vector? */ return blewit; } /* * Free all partial_symtab storage. */ static void free_all_psymtabs() { obstack_free (psymbol_obstack, 0); obstack_init (psymbol_obstack); partial_symtab_list = (struct partial_symtab *) 0; } /* Free all the symtabs that are currently installed, and all storage associated with them. Leaves us in a consistent state with no symtabs installed. */ static void free_all_symtabs () { register struct symtab *s, *snext; /* All values will be invalid because their types will be! */ clear_value_history (); clear_displays (); clear_internalvars (); #if defined (CLEAR_SOLIB) CLEAR_SOLIB (); #endif set_default_breakpoint (0, 0, 0, 0); current_source_symtab = 0; for (s = symtab_list; s; s = snext) { snext = s->next; free_symtab (s); } symtab_list = 0; obstack_free (symbol_obstack, 0); obstack_init (symbol_obstack); if (misc_function_vector) free (misc_function_vector); misc_function_count = 0; misc_function_vector = 0; clear_pc_function_cache(); } void _initialize_symfile () { add_com ("symbol-file", class_files, symbol_file_command, "Load symbol table from executable file FILE.\n\ The `file' command can also load symbol tables, as well as setting the file\n\ to execute."); add_com ("add-symbol-file", class_files, add_symbol_file_command, "Load the symbols from FILE, assuming FILE has been dynamically loaded.\n\ The second argument provides the starting address of the file's text."); add_com ("load", class_files, load_command, "Dynamically load FILE into the running program, and record its symbols\n\ for access from GDB."); add_show_from_set (add_set_cmd ("complaints", class_support, var_uinteger, (char *)&stop_whining, "Set max number of complaints about incorrect symbols.", &setlist), &showlist); add_show_from_set (add_set_cmd ("symbol-reloading", class_support, var_boolean, (char *)&symbol_reloading, "Set dynamic symbol table reloading multiple times in one run.", &setlist), &showlist); obstack_init (symbol_obstack); obstack_init (psymbol_obstack); }