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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [gprof/] [corefile.c] - Rev 144
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/* corefile.c Copyright 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. This file is part of GNU Binutils. 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 3 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ #include "gprof.h" #include "libiberty.h" #include "filenames.h" #include "search_list.h" #include "source.h" #include "symtab.h" #include "hist.h" #include "corefile.h" #include "safe-ctype.h" bfd *core_bfd; static int core_num_syms; static asymbol **core_syms; asection *core_text_sect; void * core_text_space; static int min_insn_size; int offset_to_code; /* For mapping symbols to specific .o files during file ordering. */ struct function_map * symbol_map; unsigned int symbol_map_count; static void read_function_mappings (const char *); static int core_sym_class (asymbol *); static bfd_boolean get_src_info (bfd_vma, const char **, const char **, int *); extern void i386_find_call (Sym *, bfd_vma, bfd_vma); extern void alpha_find_call (Sym *, bfd_vma, bfd_vma); extern void vax_find_call (Sym *, bfd_vma, bfd_vma); extern void tahoe_find_call (Sym *, bfd_vma, bfd_vma); extern void sparc_find_call (Sym *, bfd_vma, bfd_vma); extern void mips_find_call (Sym *, bfd_vma, bfd_vma); static void parse_error (const char *filename) { fprintf (stderr, _("%s: unable to parse mapping file %s.\n"), whoami, filename); done (1); } /* Compare two function_map structs based on function name. We want to sort in ascending order. */ static int cmp_symbol_map (const void * l, const void * r) { return strcmp (((struct function_map *) l)->function_name, ((struct function_map *) r)->function_name); } static void read_function_mappings (const char *filename) { FILE * file = fopen (filename, "r"); char dummy[1024]; int count = 0; unsigned int i; if (!file) { fprintf (stderr, _("%s: could not open %s.\n"), whoami, filename); done (1); } /* First parse the mapping file so we know how big we need to make our tables. We also do some sanity checks at this time. */ while (!feof (file)) { int matches; matches = fscanf (file, "%[^\n:]", dummy); if (!matches) parse_error (filename); /* Just skip messages about files with no symbols. */ if (!strncmp (dummy, "No symbols in ", 14)) { matches = fscanf (file, "\n"); if (matches == EOF) parse_error (filename); continue; } /* Don't care what else is on this line at this point. */ matches = fscanf (file, "%[^\n]\n", dummy); if (!matches) parse_error (filename); count++; } /* Now we know how big we need to make our table. */ symbol_map = ((struct function_map *) xmalloc (count * sizeof (struct function_map))); /* Rewind the input file so we can read it again. */ rewind (file); /* Read each entry and put it into the table. */ count = 0; while (!feof (file)) { int matches; char *tmp; matches = fscanf (file, "%[^\n:]", dummy); if (!matches) parse_error (filename); /* Just skip messages about files with no symbols. */ if (!strncmp (dummy, "No symbols in ", 14)) { matches = fscanf (file, "\n"); if (matches == EOF) parse_error (filename); continue; } /* dummy has the filename, go ahead and copy it. */ symbol_map[count].file_name = (char *) xmalloc (strlen (dummy) + 1); strcpy (symbol_map[count].file_name, dummy); /* Now we need the function name. */ matches = fscanf (file, "%[^\n]\n", dummy); if (!matches) parse_error (filename); tmp = strrchr (dummy, ' ') + 1; symbol_map[count].function_name = (char *) xmalloc (strlen (tmp) + 1); strcpy (symbol_map[count].function_name, tmp); count++; } /* Record the size of the map table for future reference. */ symbol_map_count = count; for (i = 0; i < symbol_map_count; ++i) if (i == 0 || filename_cmp (symbol_map[i].file_name, symbol_map[i - 1].file_name)) symbol_map[i].is_first = 1; qsort (symbol_map, symbol_map_count, sizeof (struct function_map), cmp_symbol_map); } void core_init (const char * aout_name) { int core_sym_bytes; asymbol *synthsyms; long synth_count; core_bfd = bfd_openr (aout_name, 0); if (!core_bfd) { perror (aout_name); done (1); } if (!bfd_check_format (core_bfd, bfd_object)) { fprintf (stderr, _("%s: %s: not in executable format\n"), whoami, aout_name); done (1); } /* Get core's text section. */ core_text_sect = bfd_get_section_by_name (core_bfd, ".text"); if (!core_text_sect) { core_text_sect = bfd_get_section_by_name (core_bfd, "$CODE$"); if (!core_text_sect) { fprintf (stderr, _("%s: can't find .text section in %s\n"), whoami, aout_name); done (1); } } /* Read core's symbol table. */ /* This will probably give us more than we need, but that's ok. */ core_sym_bytes = bfd_get_symtab_upper_bound (core_bfd); if (core_sym_bytes < 0) { fprintf (stderr, "%s: %s: %s\n", whoami, aout_name, bfd_errmsg (bfd_get_error ())); done (1); } core_syms = (asymbol **) xmalloc (core_sym_bytes); core_num_syms = bfd_canonicalize_symtab (core_bfd, core_syms); if (core_num_syms < 0) { fprintf (stderr, "%s: %s: %s\n", whoami, aout_name, bfd_errmsg (bfd_get_error ())); done (1); } synth_count = bfd_get_synthetic_symtab (core_bfd, core_num_syms, core_syms, 0, NULL, &synthsyms); if (synth_count > 0) { asymbol **symp; long new_size; long i; new_size = (core_num_syms + synth_count + 1) * sizeof (*core_syms); core_syms = (asymbol **) xrealloc (core_syms, new_size); symp = core_syms + core_num_syms; core_num_syms += synth_count; for (i = 0; i < synth_count; i++) *symp++ = synthsyms + i; *symp = 0; } min_insn_size = 1; offset_to_code = 0; switch (bfd_get_arch (core_bfd)) { case bfd_arch_vax: case bfd_arch_tahoe: offset_to_code = 2; break; case bfd_arch_alpha: min_insn_size = 4; break; default: break; } if (function_mapping_file) read_function_mappings (function_mapping_file); } /* Read in the text space of an a.out file. */ void core_get_text_space (bfd *cbfd) { core_text_space = malloc (bfd_get_section_size (core_text_sect)); if (!core_text_space) { fprintf (stderr, _("%s: ran out room for %lu bytes of text space\n"), whoami, (unsigned long) bfd_get_section_size (core_text_sect)); done (1); } if (!bfd_get_section_contents (cbfd, core_text_sect, core_text_space, 0, bfd_get_section_size (core_text_sect))) { bfd_perror ("bfd_get_section_contents"); free (core_text_space); core_text_space = 0; } if (!core_text_space) fprintf (stderr, _("%s: can't do -c\n"), whoami); } void find_call (Sym *parent, bfd_vma p_lowpc, bfd_vma p_highpc) { if (core_text_space == 0) return; hist_clip_symbol_address (&p_lowpc, &p_highpc); switch (bfd_get_arch (core_bfd)) { case bfd_arch_i386: i386_find_call (parent, p_lowpc, p_highpc); break; case bfd_arch_alpha: alpha_find_call (parent, p_lowpc, p_highpc); break; case bfd_arch_vax: vax_find_call (parent, p_lowpc, p_highpc); break; case bfd_arch_sparc: sparc_find_call (parent, p_lowpc, p_highpc); break; case bfd_arch_tahoe: tahoe_find_call (parent, p_lowpc, p_highpc); break; case bfd_arch_mips: mips_find_call (parent, p_lowpc, p_highpc); break; default: fprintf (stderr, _("%s: -c not supported on architecture %s\n"), whoami, bfd_printable_name(core_bfd)); /* Don't give the error more than once. */ ignore_direct_calls = FALSE; } } /* Return class of symbol SYM. The returned class can be any of: 0 -> symbol is not interesting to us 'T' -> symbol is a global name 't' -> symbol is a local (static) name. */ static int core_sym_class (asymbol *sym) { symbol_info syminfo; const char *name; char sym_prefix; int i; if (sym->section == NULL || (sym->flags & BSF_DEBUGGING) != 0) return 0; /* Must be a text symbol, and static text symbols don't qualify if ignore_static_funcs set. */ if (ignore_static_funcs && (sym->flags & BSF_LOCAL)) { DBG (AOUTDEBUG, printf ("[core_sym_class] %s: not a function\n", sym->name)); return 0; } bfd_get_symbol_info (core_bfd, sym, &syminfo); i = syminfo.type; if (i == 'T') return i; /* It's a global symbol. */ if (i == 'W') /* Treat weak symbols as text symbols. FIXME: a weak symbol may also be a data symbol. */ return 'T'; if (i != 't') { /* Not a static text symbol. */ DBG (AOUTDEBUG, printf ("[core_sym_class] %s is of class %c\n", sym->name, i)); return 0; } /* Do some more filtering on static function-names. */ if (ignore_static_funcs) return 0; /* Can't zero-length name or funny characters in name, where `funny' includes: `.' (.o file names) and `$' (Pascal labels). */ if (!sym->name || sym->name[0] == '\0') return 0; for (name = sym->name; *name; ++name) { if (*name == '$') return 0; if (*name == '.') { /* Allow GCC cloned functions. */ if (strlen (name) > 7 && strncmp (name, ".clone.", 7) == 0) name += 6; /* Do not discard nested subprograms (those which end with .NNN, where N are digits). */ for (name++; *name; name++) if (! ISDIGIT (*name)) return 0; break; } } /* On systems where the C compiler adds an underscore to all names, static names without underscores seem usually to be labels in hand written assembler in the library. We don't want these names. This is certainly necessary on a Sparc running SunOS 4.1 (try profiling a program that does a lot of division). I don't know whether it has harmful side effects on other systems. Perhaps it should be made configurable. */ sym_prefix = bfd_get_symbol_leading_char (core_bfd); if ((sym_prefix && sym_prefix != sym->name[0]) /* GCC may add special symbols to help gdb figure out the file language. We want to ignore these, since sometimes they mask the real function. (dj@ctron) */ || !strncmp (sym->name, "__gnu_compiled", 14) || !strncmp (sym->name, "___gnu_compiled", 15)) { return 0; } /* If the object file supports marking of function symbols, then we can zap anything that doesn't have BSF_FUNCTION set. */ if (ignore_non_functions && (sym->flags & BSF_FUNCTION) == 0) return 0; return 't'; /* It's a static text symbol. */ } /* Get whatever source info we can get regarding address ADDR. */ static bfd_boolean get_src_info (bfd_vma addr, const char **filename, const char **name, int *line_num) { const char *fname = 0, *func_name = 0; int l = 0; if (bfd_find_nearest_line (core_bfd, core_text_sect, core_syms, addr - core_text_sect->vma, &fname, &func_name, (unsigned int *) &l) && fname && func_name && l) { DBG (AOUTDEBUG, printf ("[get_src_info] 0x%lx -> %s:%d (%s)\n", (unsigned long) addr, fname, l, func_name)); *filename = fname; *name = func_name; *line_num = l; return TRUE; } else { DBG (AOUTDEBUG, printf ("[get_src_info] no info for 0x%lx (%s:%d,%s)\n", (unsigned long) addr, fname ? fname : "<unknown>", l, func_name ? func_name : "<unknown>")); return FALSE; } } /* Return number of symbols in a symbol-table file. */ static int num_of_syms_in (FILE * f) { const int BUFSIZE = 1024; char * buf = (char *) xmalloc (BUFSIZE); char * address = (char *) xmalloc (BUFSIZE); char type; char * name = (char *) xmalloc (BUFSIZE); int num = 0; while (!feof (f) && fgets (buf, BUFSIZE - 1, f)) { if (sscanf (buf, "%s %c %s", address, &type, name) == 3) if (type == 't' || type == 'T') ++num; } free (buf); free (address); free (name); return num; } /* Read symbol table from a file. */ void core_create_syms_from (const char * sym_table_file) { const int BUFSIZE = 1024; char * buf = (char *) xmalloc (BUFSIZE); char * address = (char *) xmalloc (BUFSIZE); char type; char * name = (char *) xmalloc (BUFSIZE); bfd_vma min_vma = ~(bfd_vma) 0; bfd_vma max_vma = 0; FILE * f; f = fopen (sym_table_file, "r"); if (!f) { fprintf (stderr, _("%s: could not open %s.\n"), whoami, sym_table_file); done (1); } /* Pass 1 - determine upper bound on number of function names. */ symtab.len = num_of_syms_in (f); if (symtab.len == 0) { fprintf (stderr, _("%s: file `%s' has no symbols\n"), whoami, sym_table_file); done (1); } symtab.base = (Sym *) xmalloc (symtab.len * sizeof (Sym)); /* Pass 2 - create symbols. */ symtab.limit = symtab.base; if (fseek (f, 0, SEEK_SET) != 0) { perror (sym_table_file); done (1); } while (!feof (f) && fgets (buf, BUFSIZE - 1, f)) { if (sscanf (buf, "%s %c %s", address, &type, name) == 3) if (type != 't' && type != 'T') continue; sym_init (symtab.limit); sscanf (address, "%" BFD_VMA_FMT "x", &(symtab.limit->addr) ); symtab.limit->name = (char *) xmalloc (strlen (name) + 1); strcpy ((char *) symtab.limit->name, name); symtab.limit->mapped = 0; symtab.limit->is_func = TRUE; symtab.limit->is_bb_head = TRUE; symtab.limit->is_static = (type == 't'); min_vma = MIN (symtab.limit->addr, min_vma); max_vma = MAX (symtab.limit->addr, max_vma); ++symtab.limit; } fclose (f); symtab.len = symtab.limit - symtab.base; symtab_finalize (&symtab); free (buf); free (address); free (name); } static int search_mapped_symbol (const void * l, const void * r) { return strcmp ((const char *) l, ((const struct function_map *) r)->function_name); } /* Read in symbol table from core. One symbol per function is entered. */ void core_create_function_syms (void) { bfd_vma min_vma = ~ (bfd_vma) 0; bfd_vma max_vma = 0; int cxxclass; long i; struct function_map * found; int core_has_func_syms = 0; switch (core_bfd->xvec->flavour) { default: break; case bfd_target_coff_flavour: case bfd_target_ecoff_flavour: case bfd_target_xcoff_flavour: case bfd_target_elf_flavour: case bfd_target_nlm_flavour: case bfd_target_som_flavour: core_has_func_syms = 1; } /* Pass 1 - determine upper bound on number of function names. */ symtab.len = 0; for (i = 0; i < core_num_syms; ++i) { if (!core_sym_class (core_syms[i])) continue; /* Don't create a symtab entry for a function that has a mapping to a file, unless it's the first function in the file. */ found = (struct function_map *) bsearch (core_syms[i]->name, symbol_map, symbol_map_count, sizeof (struct function_map), search_mapped_symbol); if (found == NULL || found->is_first) ++symtab.len; } if (symtab.len == 0) { fprintf (stderr, _("%s: file `%s' has no symbols\n"), whoami, a_out_name); done (1); } symtab.base = (Sym *) xmalloc (symtab.len * sizeof (Sym)); /* Pass 2 - create symbols. */ symtab.limit = symtab.base; for (i = 0; i < core_num_syms; ++i) { asection *sym_sec; cxxclass = core_sym_class (core_syms[i]); if (!cxxclass) { DBG (AOUTDEBUG, printf ("[core_create_function_syms] rejecting: 0x%lx %s\n", (unsigned long) core_syms[i]->value, core_syms[i]->name)); continue; } found = (struct function_map *) bsearch (core_syms[i]->name, symbol_map, symbol_map_count, sizeof (struct function_map), search_mapped_symbol); if (found && ! found->is_first) continue; sym_init (symtab.limit); /* Symbol offsets are always section-relative. */ sym_sec = core_syms[i]->section; symtab.limit->addr = core_syms[i]->value; if (sym_sec) symtab.limit->addr += bfd_get_section_vma (sym_sec->owner, sym_sec); if (found) { symtab.limit->name = found->file_name; symtab.limit->mapped = 1; } else { symtab.limit->name = core_syms[i]->name; symtab.limit->mapped = 0; } /* Lookup filename and line number, if we can. */ { const char * filename; const char * func_name; if (get_src_info (symtab.limit->addr, & filename, & func_name, & symtab.limit->line_num)) { symtab.limit->file = source_file_lookup_path (filename); /* FIXME: Checking __osf__ here does not work with a cross gprof. */ #ifdef __osf__ /* Suppress symbols that are not function names. This is useful to suppress code-labels and aliases. This is known to be useful under DEC's OSF/1. Under SunOS 4.x, labels do not appear in the symbol table info, so this isn't necessary. */ if (strcmp (symtab.limit->name, func_name) != 0) { /* The symbol's address maps to a different name, so it can't be a function-entry point. This happens for labels, for example. */ DBG (AOUTDEBUG, printf ("[core_create_function_syms: rej %s (maps to %s)\n", symtab.limit->name, func_name)); continue; } #endif } } symtab.limit->is_func = (!core_has_func_syms || (core_syms[i]->flags & BSF_FUNCTION) != 0); symtab.limit->is_bb_head = TRUE; if (cxxclass == 't') symtab.limit->is_static = TRUE; /* Keep track of the minimum and maximum vma addresses used by all symbols. When computing the max_vma, use the ending address of the section containing the symbol, if available. */ min_vma = MIN (symtab.limit->addr, min_vma); if (sym_sec) max_vma = MAX (bfd_get_section_vma (sym_sec->owner, sym_sec) + bfd_section_size (sym_sec->owner, sym_sec) - 1, max_vma); else max_vma = MAX (symtab.limit->addr, max_vma); DBG (AOUTDEBUG, printf ("[core_create_function_syms] %ld %s 0x%lx\n", (long) (symtab.limit - symtab.base), symtab.limit->name, (unsigned long) symtab.limit->addr)); ++symtab.limit; } symtab.len = symtab.limit - symtab.base; symtab_finalize (&symtab); } /* Read in symbol table from core. One symbol per line of source code is entered. */ void core_create_line_syms (void) { char *prev_name, *prev_filename; unsigned int prev_name_len, prev_filename_len; bfd_vma vma, min_vma = ~(bfd_vma) 0, max_vma = 0; Sym *prev, dummy, *sym; const char *filename; int prev_line_num; Sym_Table ltab; bfd_vma vma_high; /* Create symbols for functions as usual. This is necessary in cases where parts of a program were not compiled with -g. For those parts we still want to get info at the function level. */ core_create_function_syms (); /* Pass 1: count the number of symbols. */ /* To find all line information, walk through all possible text-space addresses (one by one!) and get the debugging info for each address. When the debugging info changes, it is time to create a new symbol. Of course, this is rather slow and it would be better if BFD would provide an iterator for enumerating all line infos. */ prev_name_len = PATH_MAX; prev_filename_len = PATH_MAX; prev_name = (char *) xmalloc (prev_name_len); prev_filename = (char *) xmalloc (prev_filename_len); ltab.len = 0; prev_line_num = 0; vma_high = core_text_sect->vma + bfd_get_section_size (core_text_sect); for (vma = core_text_sect->vma; vma < vma_high; vma += min_insn_size) { unsigned int len; if (!get_src_info (vma, &filename, &dummy.name, &dummy.line_num) || (prev_line_num == dummy.line_num && prev_name != NULL && strcmp (prev_name, dummy.name) == 0 && filename_cmp (prev_filename, filename) == 0)) continue; ++ltab.len; prev_line_num = dummy.line_num; len = strlen (dummy.name); if (len >= prev_name_len) { prev_name_len = len + 1024; free (prev_name); prev_name = (char *) xmalloc (prev_name_len); } strcpy (prev_name, dummy.name); len = strlen (filename); if (len >= prev_filename_len) { prev_filename_len = len + 1024; free (prev_filename); prev_filename = (char *) xmalloc (prev_filename_len); } strcpy (prev_filename, filename); min_vma = MIN (vma, min_vma); max_vma = MAX (vma, max_vma); } free (prev_name); free (prev_filename); /* Make room for function symbols, too. */ ltab.len += symtab.len; ltab.base = (Sym *) xmalloc (ltab.len * sizeof (Sym)); ltab.limit = ltab.base; /* Pass 2 - create symbols. */ /* We now set is_static as we go along, rather than by running through the symbol table at the end. The old way called symtab_finalize before the is_static pass, causing a problem since symtab_finalize uses is_static as part of its address conflict resolution algorithm. Since global symbols were prefered over static symbols, and all line symbols were global at that point, static function names that conflicted with their own line numbers (static, but labeled as global) were rejected in favor of the line num. This was not the desired functionality. We always want to keep our function symbols and discard any conflicting line symbols. Perhaps symtab_finalize should be modified to make this distinction as well, but the current fix works and the code is a lot cleaner now. */ prev = 0; for (vma = core_text_sect->vma; vma < vma_high; vma += min_insn_size) { sym_init (ltab.limit); if (!get_src_info (vma, &filename, <ab.limit->name, <ab.limit->line_num) || (prev && prev->line_num == ltab.limit->line_num && strcmp (prev->name, ltab.limit->name) == 0 && filename_cmp (prev->file->name, filename) == 0)) continue; /* Make name pointer a malloc'ed string. */ ltab.limit->name = xstrdup (ltab.limit->name); ltab.limit->file = source_file_lookup_path (filename); ltab.limit->addr = vma; /* Set is_static based on the enclosing function, using either: 1) the previous symbol, if it's from the same function, or 2) a symtab lookup. */ if (prev && ltab.limit->file == prev->file && strcmp (ltab.limit->name, prev->name) == 0) { ltab.limit->is_static = prev->is_static; } else { sym = sym_lookup(&symtab, ltab.limit->addr); if (sym) ltab.limit->is_static = sym->is_static; } prev = ltab.limit; DBG (AOUTDEBUG, printf ("[core_create_line_syms] %lu %s 0x%lx\n", (unsigned long) (ltab.limit - ltab.base), ltab.limit->name, (unsigned long) ltab.limit->addr)); ++ltab.limit; } /* Copy in function symbols. */ memcpy (ltab.limit, symtab.base, symtab.len * sizeof (Sym)); ltab.limit += symtab.len; if ((unsigned int) (ltab.limit - ltab.base) != ltab.len) { fprintf (stderr, _("%s: somebody miscounted: ltab.len=%d instead of %ld\n"), whoami, ltab.len, (long) (ltab.limit - ltab.base)); done (1); } /* Finalize ltab and make it symbol table. */ symtab_finalize (<ab); free (symtab.base); symtab = ltab; }
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