5489fcc3d9
Alpha support. Long options. New file format to support more information; backwards compatibility. Line-level profiling, on systems where bfd_find_nearest_line works. Selective display of data.
476 lines
13 KiB
C
476 lines
13 KiB
C
#include "libiberty.h"
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#include "gprof.h"
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#include "core.h"
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#include "symtab.h"
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bfd *core_bfd;
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int core_num_syms;
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asymbol **core_syms;
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asection *core_text_sect;
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PTR core_text_space;
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void
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DEFUN(core_init, (a_out_name), const char *a_out_name)
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{
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core_bfd = bfd_openr(a_out_name, 0);
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if (!core_bfd) {
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perror(a_out_name);
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done(1);
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} /* if */
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if (!bfd_check_format(core_bfd, bfd_object)) {
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fprintf(stderr, "%s: %s: not in a.out format\n", whoami, a_out_name);
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done(1);
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} /* if */
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/* get core's text section: */
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core_text_sect = bfd_get_section_by_name(core_bfd, ".text");
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if (!core_text_sect) {
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core_text_sect = bfd_get_section_by_name(core_bfd, "$CODE$");
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if (!core_text_sect) {
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fprintf(stderr, "%s: can't find .text section in %s\n",
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whoami, a_out_name);
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done(1);
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} /* if */
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} /* if */
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/* read core's symbol table: */
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/* this will probably give us more than we need, but that's ok: */
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core_num_syms = bfd_get_symtab_upper_bound(core_bfd);
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if (core_num_syms < 0) {
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fprintf(stderr, "%s: %s: %s\n", whoami, a_out_name,
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bfd_errmsg(bfd_get_error()));
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done(1);
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} /* if */
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core_syms = (asymbol**)xmalloc(core_num_syms);
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core_num_syms = bfd_canonicalize_symtab(core_bfd, core_syms);
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if (core_num_syms < 0) {
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fprintf(stderr, "%s: %s: %s\n", whoami, a_out_name,
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bfd_errmsg(bfd_get_error()));
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done(1);
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} /* if */
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} /* core_init */
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/*
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* Read in the text space of an a.out file
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*/
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void
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DEFUN(core_get_text_space, (core_bfd), bfd *core_bfd)
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{
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core_text_space = (PTR) malloc(core_text_sect->_raw_size);
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if (!core_text_space) {
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fprintf(stderr, "%s: ran out room for %ld bytes of text space\n",
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whoami, core_text_sect->_raw_size);
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done(1);
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} /* if */
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if (!bfd_get_section_contents(core_bfd, core_text_sect, core_text_space,
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0, core_text_sect->_raw_size))
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{
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bfd_perror("bfd_get_section_contents");
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free(core_text_space);
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core_text_space = 0;
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} /* if */
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if (!core_text_space) {
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fprintf(stderr, "%s: can't do -c\n", whoami);
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} /* if */
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} /* core_get_text_space */
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/*
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* Return class of symbol SYM. The returned class can be any of:
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* 0 -> symbol is not interesting to us
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* 'T' -> symbol is a global name
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* 't' -> symbol is a local (static) name
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*/
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static int
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DEFUN(core_sym_class, (sym), asymbol *sym)
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{
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symbol_info syminfo;
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const char *name;
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char sym_prefix;
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int i;
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/*
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* Must be a text symbol, and static text symbols don't qualify if
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* ignore_static_funcs set.
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*/
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if (!sym->section) {
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return 0;
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} /* if */
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if (ignore_static_funcs && (sym->flags & BSF_LOCAL)) {
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DBG(AOUTDEBUG, printf("[core_sym_class] %s: not a function\n",
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sym->name));
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return 0;
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} /* if */
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bfd_get_symbol_info(core_bfd, sym, &syminfo);
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i = syminfo.type;
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if (i == 'T') {
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return i; /* it's a global symbol */
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} /* if */
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if (i != 't') {
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/* not a static text symbol */
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DBG(AOUTDEBUG, printf("[core_sym_class] %s is of class %c\n",
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sym->name, i));
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return 0;
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} /* if */
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/* do some more filtering on static function-names: */
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if (ignore_static_funcs) {
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return 0;
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} /* if */
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/*
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* Can't zero-length name or funny characters in name, where
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* `funny' includes: `.' (.o file names) and `$' (Pascal labels).
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*/
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if (!sym->name || sym->name[0] == '\0') {
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return 0;
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} /* if */
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for (name = sym->name; *name; ++name) {
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if (*name == '.' || *name == '$') {
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return 0;
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} /* if */
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} /* if */
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/*
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* On systems where the C compiler adds an underscore to all
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* names, static names without underscores seem usually to be
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* labels in hand written assembler in the library. We don't want
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* these names. This is certainly necessary on a Sparc running
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* SunOS 4.1 (try profiling a program that does a lot of
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* division). I don't know whether it has harmful side effects on
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* other systems. Perhaps it should be made configurable.
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*/
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sym_prefix = bfd_get_symbol_leading_char(core_bfd);
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if (sym_prefix && sym_prefix != sym->name[0]
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/*
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* GCC may add special symbols to help gdb figure out the file
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* language. We want to ignore these, since sometimes they mask
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* the real function. (dj@ctron)
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*/
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|| !strncmp (sym->name, "__gnu_compiled", 14)
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|| !strncmp (sym->name, "___gnu_compiled", 15))
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{
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return 0;
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} /* if */
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return 't'; /* it's a static text symbol */
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} /* core_sym_class */
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/*
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* Get whatever source info we can get regarding address ADDR:
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*/
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static bool
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DEFUN(get_src_info, (addr, filename, name, line_num),
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bfd_vma addr AND const char **filename AND const char **name
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AND int *line_num)
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{
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const char *fname = 0, *func_name = 0;
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int l = 0;
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if (bfd_find_nearest_line(core_bfd, core_text_sect, core_syms,
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addr - core_text_sect->vma,
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&fname, &func_name, &l)
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&& fname && func_name && l)
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{
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DBG(AOUTDEBUG, printf("[get_src_info] 0x%lx -> %s:%d (%s)\n",
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addr, fname, l, func_name));
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*filename = fname;
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*name = func_name;
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*line_num = l;
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return TRUE;
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} else {
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DBG(AOUTDEBUG, printf("[get_src_info] no info for 0x%lx (%s:%d,%s)\n",
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(long) addr, fname ? fname : "<unknown>", l,
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func_name ? func_name : "<unknown>"));
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return FALSE;
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} /* if */
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} /* get_src_info */
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/*
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* Read in symbol table from core. One symbol per function is
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* entered.
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*/
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void
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DEFUN(core_create_function_syms, (core_bfd), bfd *core_bfd)
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{
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bfd_vma min_vma = ~0, max_vma = 0;
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const char *filename, *func_name;
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int class;
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long i;
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/* pass 1 - determine upper bound on number of function names: */
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symtab.len = 0;
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for (i = 0; i < core_num_syms; ++i) {
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if (!core_sym_class(core_syms[i])) {
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continue;
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} /* if */
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++symtab.len;
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} /* for */
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if (symtab.len == 0) {
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fprintf(stderr, "%s: file `%s' has no symbols\n", whoami, a_out_name);
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done(1);
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} /* if */
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/* the "+ 2" is for the sentinels: */
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symtab.base = (Sym*)xmalloc((symtab.len + 2) * sizeof(Sym));
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/* pass 2 - create symbols: */
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symtab.limit = symtab.base;
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for (i = 0; i < core_num_syms; ++i) {
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class = core_sym_class(core_syms[i]);
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if (!class) {
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DBG(AOUTDEBUG,
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printf("[core_create_function_syms] rejecting: 0x%lx %s\n",
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core_syms[i]->value, core_syms[i]->name));
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continue;
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} /* if */
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sym_init(symtab.limit);
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/* symbol offsets are always section-relative: */
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symtab.limit->addr = core_syms[i]->value + core_syms[i]->section->vma;
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symtab.limit->name = core_syms[i]->name;
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#ifdef __osf__
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/*
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* Suppress symbols that are not function names. This is
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* useful to suppress code-labels and aliases.
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*
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* This is known to be useful under DEC's OSF/1. Under SunOS 4.x,
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* labels do not appear in the symbol table info, so this isn't
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* necessary.
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*/
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if (get_src_info(symtab.limit->addr, &filename, &func_name,
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&symtab.limit->line_num))
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{
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symtab.limit->file = source_file_lookup_path(filename);
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if (strcmp(symtab.limit->name, func_name) != 0) {
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/*
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* The symbol's address maps to a different name, so
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* it can't be a function-entry point. This happens
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* for labels, for example.
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*/
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DBG(AOUTDEBUG,
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printf("[core_create_function_syms: rej %s (maps to %s)\n",
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symtab.limit->name, func_name));
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continue;
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} /* if */
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} /* if */
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#endif
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symtab.limit->is_func = TRUE;
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symtab.limit->is_bb_head = TRUE;
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if (class == 't') {
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symtab.limit->is_static = TRUE;
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} /* if */
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min_vma = MIN(symtab.limit->addr, min_vma);
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max_vma = MAX(symtab.limit->addr, max_vma);
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/*
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* If we see "main" without an initial '_', we assume names
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* are *not* prefixed by '_'.
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*/
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if (symtab.limit->name[0] == 'm' && discard_underscores
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&& strcmp(symtab.limit->name, "main") == 0)
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{
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discard_underscores = 0;
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} /* if */
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DBG(AOUTDEBUG, printf("[core_create_function_syms] %ld %s 0x%lx\n",
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(long)(symtab.limit - symtab.base),
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symtab.limit->name, symtab.limit->addr));
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++symtab.limit;
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} /* for */
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/* create sentinels: */
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sym_init(symtab.limit);
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symtab.limit->name = "<locore>";
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symtab.limit->addr = 0;
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symtab.limit->end_addr = min_vma - 1;
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++symtab.limit;
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sym_init(symtab.limit);
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symtab.limit->name = "<hicore>";
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symtab.limit->addr = max_vma + 1;
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symtab.limit->end_addr = ~0;
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++symtab.limit;
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symtab.len = symtab.limit - symtab.base;
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symtab_finalize(&symtab);
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} /* core_create_function_syms */
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/*
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* Read in symbol table from core. One symbol per line of source code
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* is entered.
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*/
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void
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DEFUN(core_create_line_syms, (core_bfd), bfd *core_bfd)
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{
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char prev_name[PATH_MAX], prev_filename[PATH_MAX];
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bfd_vma vma, min_vma = ~0, max_vma = 0;
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bfd_vma offset, prev_offset, min_dist;
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Sym *prev, dummy, *sentinel, *sym;
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const char *filename;
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int prev_line_num, i;
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Sym_Table ltab;
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/*
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* Create symbols for functions as usual. This is necessary in
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* cases where parts of a program were not compiled with -g. For
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* those parts we still want to get info at the function level:
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*/
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core_create_function_syms(core_bfd);
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/* pass 1 - counter number of symbols: */
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/*
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* To find all line information, walk through all possible
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* text-space addresses (one by one!) and get the debugging
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* info for each address. When the debugging info changes,
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* it is time to create a new symbol.
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*
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* Of course, this is rather slow and it would be better if
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* bfd would provide an iterator for enumerating all line
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* infos, but for now, we try to speed up the second pass
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* by determining what the minimum code distance between two
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* lines is.
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*/
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prev_name[0] = '\0';
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ltab.len = 0;
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min_dist = core_text_sect->_raw_size;
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prev_offset = -min_dist;
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prev_filename[0] = '\0';
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prev_line_num = 0;
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for (offset = 0; offset < core_text_sect->_raw_size; ++offset) {
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vma = core_text_sect->vma + offset;
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if (!get_src_info(vma, &filename, &dummy.name, &dummy.line_num)
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|| (prev_line_num == dummy.line_num &&
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strcmp(prev_name, dummy.name) == 0
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&& strcmp(prev_filename, filename) == 0))
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{
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continue;
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} /* if */
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++ltab.len;
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prev_line_num = dummy.line_num;
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strcpy(prev_name, dummy.name);
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strcpy(prev_filename, filename);
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if (offset - prev_offset < min_dist) {
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min_dist = offset - prev_offset;
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} /* if */
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prev_offset = offset;
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min_vma = MIN(vma, min_vma);
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max_vma = MAX(vma, max_vma);
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} /* for */
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DBG(AOUTDEBUG, printf("[core_create_line_syms] min_dist=%lx\n", min_dist));
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/* make room for function symbols, too: */
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ltab.len += symtab.len;
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ltab.base = (Sym*) xmalloc(ltab.len * sizeof(Sym));
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ltab.limit = ltab.base;
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/* pass 2 - create symbols: */
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prev = 0;
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for (offset = 0; offset < core_text_sect->_raw_size; offset += min_dist) {
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sym_init(ltab.limit);
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if (!get_src_info(core_text_sect->vma + offset, &filename,
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<ab.limit->name, <ab.limit->line_num)
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|| (prev && prev->line_num == ltab.limit->line_num
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&& strcmp(prev->name, ltab.limit->name) == 0
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&& strcmp(prev->file->name, filename) == 0))
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{
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continue;
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} /* if */
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/* make name pointer a malloc'ed string: */
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ltab.limit->name = strdup(ltab.limit->name);
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ltab.limit->file = source_file_lookup_path(filename);
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ltab.limit->addr = core_text_sect->vma + offset;
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prev = ltab.limit;
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/*
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* If we see "main" without an initial '_', we assume names
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* are *not* prefixed by '_'.
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*/
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if (ltab.limit->name[0] == 'm' && discard_underscores
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&& strcmp(ltab.limit->name, "main") == 0)
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{
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discard_underscores = 0;
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} /* if */
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DBG(AOUTDEBUG, printf("[core_create_line_syms] %d %s 0x%lx\n",
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ltab.len, ltab.limit->name,
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ltab.limit->addr));
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++ltab.limit;
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} /* for */
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/* update sentinels: */
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sentinel = sym_lookup(&symtab, 0);
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if (strcmp(sentinel->name, "<locore>") == 0
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&& min_vma <= sentinel->end_addr)
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{
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sentinel->end_addr = min_vma - 1;
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} /* if */
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sentinel = sym_lookup(&symtab, ~0);
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if (strcmp(sentinel->name, "<hicore>") == 0 && max_vma >= sentinel->addr) {
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sentinel->addr = max_vma + 1;
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} /* if */
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/* copy in function symbols: */
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memcpy(ltab.limit, symtab.base, symtab.len * sizeof(Sym));
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ltab.limit += symtab.len;
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if (ltab.limit - ltab.base != ltab.len) {
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fprintf(stderr,
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"%s: somebody miscounted: ltab.len=%ld instead of %d\n",
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whoami, (long) (ltab.limit - ltab.base), ltab.len);
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done(1);
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} /* if */
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/* finalize ltab and make it symbol table: */
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symtab_finalize(<ab);
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free(symtab.base);
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symtab = ltab;
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/* now go through all core symbols and set is_static accordingly: */
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for (i = 0; i < core_num_syms; ++i) {
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if (core_sym_class(core_syms[i]) == 't') {
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sym = sym_lookup(&symtab, core_syms[i]->value
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+ core_syms[i]->section->vma);
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do {
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sym++->is_static = TRUE;
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} while (sym->file == sym[-1].file &&
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strcmp(sym->name, sym[-1].name) == 0);
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} /* if */
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} /* for */
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} /* core_create_line_syms */
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/*** end of core.c ***/
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