674 lines
20 KiB
C
674 lines
20 KiB
C
/* Shared code to pre-read a stab (dbx-style), when building a psymtab.
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Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994
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Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* The following need to be defined:
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SET_NAMESTRING() --Set namestring to name of symbol.
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CUR_SYMBOL_TYPE --Type code of current symbol.
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CUR_SYMBOL_VALUE --Value field of current symbol. May be adjusted here.
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*/
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/* End of macro definitions, now let's handle them symbols! */
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switch (CUR_SYMBOL_TYPE)
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{
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char *p;
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/*
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* Standard, external, non-debugger, symbols
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*/
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case N_TEXT | N_EXT:
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case N_NBTEXT | N_EXT:
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CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_TEXT);
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goto record_it;
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case N_DATA | N_EXT:
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case N_NBDATA | N_EXT:
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CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_DATA);
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goto record_it;
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case N_BSS:
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case N_BSS | N_EXT:
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case N_NBBSS | N_EXT:
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case N_SETV | N_EXT: /* FIXME, is this in BSS? */
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CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_BSS);
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goto record_it;
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case N_ABS | N_EXT:
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record_it:
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#ifdef DBXREAD_ONLY
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SET_NAMESTRING();
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bss_ext_symbol:
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record_minimal_symbol (namestring, CUR_SYMBOL_VALUE,
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CUR_SYMBOL_TYPE, objfile); /* Always */
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#endif /* DBXREAD_ONLY */
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continue;
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/* Standard, local, non-debugger, symbols */
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case N_NBTEXT:
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/* We need to be able to deal with both N_FN or N_TEXT,
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because we have no way of knowing whether the sys-supplied ld
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or GNU ld was used to make the executable. Sequents throw
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in another wrinkle -- they renumbered N_FN. */
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case N_FN:
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case N_FN_SEQ:
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case N_TEXT:
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#ifdef DBXREAD_ONLY
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CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_TEXT);
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SET_NAMESTRING();
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if ((namestring[0] == '-' && namestring[1] == 'l')
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|| (namestring [(nsl = strlen (namestring)) - 1] == 'o'
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&& namestring [nsl - 2] == '.')
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)
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{
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if (objfile -> ei.entry_point < CUR_SYMBOL_VALUE &&
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objfile -> ei.entry_point >= last_o_file_start)
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{
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objfile -> ei.entry_file_lowpc = last_o_file_start;
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objfile -> ei.entry_file_highpc = CUR_SYMBOL_VALUE;
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}
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if (past_first_source_file && pst
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/* The gould NP1 uses low values for .o and -l symbols
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which are not the address. */
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&& CUR_SYMBOL_VALUE >= pst->textlow)
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{
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END_PSYMTAB (pst, psymtab_include_list, includes_used,
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symnum * symbol_size, CUR_SYMBOL_VALUE,
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dependency_list, dependencies_used);
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pst = (struct partial_symtab *) 0;
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includes_used = 0;
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dependencies_used = 0;
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}
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else
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past_first_source_file = 1;
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last_o_file_start = CUR_SYMBOL_VALUE;
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}
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else
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goto record_it;
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#endif /* DBXREAD_ONLY */
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continue;
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case N_DATA:
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CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_DATA);
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goto record_it;
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case N_UNDF | N_EXT:
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#ifdef DBXREAD_ONLY
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if (CUR_SYMBOL_VALUE != 0) {
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/* This is a "Fortran COMMON" symbol. See if the target
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environment knows where it has been relocated to. */
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CORE_ADDR reladdr;
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SET_NAMESTRING();
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if (target_lookup_symbol (namestring, &reladdr)) {
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continue; /* Error in lookup; ignore symbol for now. */
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}
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CUR_SYMBOL_TYPE ^= (N_BSS^N_UNDF); /* Define it as a bss-symbol */
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CUR_SYMBOL_VALUE = reladdr;
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goto bss_ext_symbol;
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}
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#endif /* DBXREAD_ONLY */
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continue; /* Just undefined, not COMMON */
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case N_UNDF:
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#ifdef DBXREAD_ONLY
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if (processing_acc_compilation && bufp->n_strx == 1) {
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/* Deal with relative offsets in the string table
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used in ELF+STAB under Solaris. If we want to use the
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n_strx field, which contains the name of the file,
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we must adjust file_string_table_offset *before* calling
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SET_NAMESTRING(). */
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past_first_source_file = 1;
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file_string_table_offset = next_file_string_table_offset;
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next_file_string_table_offset =
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file_string_table_offset + bufp->n_value;
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if (next_file_string_table_offset < file_string_table_offset)
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error ("string table offset backs up at %d", symnum);
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/* FIXME -- replace error() with complaint. */
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continue;
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}
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#endif /* DBXREAD_ONLY */
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continue;
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/* Lots of symbol types we can just ignore. */
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case N_ABS:
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case N_NBDATA:
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case N_NBBSS:
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continue;
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/* Keep going . . .*/
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/*
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* Special symbol types for GNU
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*/
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case N_INDR:
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case N_INDR | N_EXT:
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case N_SETA:
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case N_SETA | N_EXT:
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case N_SETT:
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case N_SETT | N_EXT:
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case N_SETD:
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case N_SETD | N_EXT:
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case N_SETB:
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case N_SETB | N_EXT:
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case N_SETV:
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continue;
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/*
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* Debugger symbols
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*/
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case N_SO: {
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unsigned long valu;
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static int prev_so_symnum = -10;
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static int first_so_symnum;
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char *p;
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valu = CUR_SYMBOL_VALUE + ANOFFSET (section_offsets, SECT_OFF_TEXT);
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past_first_source_file = 1;
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if (prev_so_symnum != symnum - 1)
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{ /* Here if prev stab wasn't N_SO */
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first_so_symnum = symnum;
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if (pst)
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{
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END_PSYMTAB (pst, psymtab_include_list, includes_used,
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symnum * symbol_size, valu,
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dependency_list, dependencies_used);
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pst = (struct partial_symtab *) 0;
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includes_used = 0;
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dependencies_used = 0;
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}
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}
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prev_so_symnum = symnum;
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/* End the current partial symtab and start a new one */
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SET_NAMESTRING();
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/* Null name means end of .o file. Don't start a new one. */
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if (*namestring == '\000')
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continue;
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/* Some compilers (including gcc) emit a pair of initial N_SOs.
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The first one is a directory name; the second the file name.
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If pst exists, is empty, and has a filename ending in '/',
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we assume the previous N_SO was a directory name. */
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p = strrchr (namestring, '/');
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if (p && *(p+1) == '\000')
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continue; /* Simply ignore directory name SOs */
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/* Some other compilers (C++ ones in particular) emit useless
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SOs for non-existant .c files. We ignore all subsequent SOs that
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immediately follow the first. */
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if (!pst)
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pst = START_PSYMTAB (objfile, section_offsets,
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namestring, valu,
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first_so_symnum * symbol_size,
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objfile -> global_psymbols.next,
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objfile -> static_psymbols.next);
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continue;
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}
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case N_BINCL:
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{
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#ifdef DBXREAD_ONLY
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enum language tmp_language;
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/* Add this bincl to the bincl_list for future EXCLs. No
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need to save the string; it'll be around until
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read_dbx_symtab function returns */
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SET_NAMESTRING();
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tmp_language = deduce_language_from_filename (namestring);
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/* Only change the psymtab's language if we've learned
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something useful (eg. tmp_language is not language_unknown).
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In addition, to match what start_subfile does, never change
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from C++ to C. */
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if (tmp_language != language_unknown
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&& (tmp_language != language_c
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|| psymtab_language != language_cplus))
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psymtab_language = tmp_language;
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add_bincl_to_list (pst, namestring, CUR_SYMBOL_VALUE);
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/* Mark down an include file in the current psymtab */
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goto record_include_file;
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#else /* DBXREAD_ONLY */
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continue;
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#endif
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}
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case N_SOL:
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{
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enum language tmp_language;
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/* Mark down an include file in the current psymtab */
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SET_NAMESTRING();
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tmp_language = deduce_language_from_filename (namestring);
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/* Only change the psymtab's language if we've learned
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something useful (eg. tmp_language is not language_unknown).
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In addition, to match what start_subfile does, never change
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from C++ to C. */
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if (tmp_language != language_unknown
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&& (tmp_language != language_c
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|| psymtab_language != language_cplus))
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psymtab_language = tmp_language;
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/* In C++, one may expect the same filename to come round many
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times, when code is coming alternately from the main file
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and from inline functions in other files. So I check to see
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if this is a file we've seen before -- either the main
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source file, or a previously included file.
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This seems to be a lot of time to be spending on N_SOL, but
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things like "break c-exp.y:435" need to work (I
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suppose the psymtab_include_list could be hashed or put
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in a binary tree, if profiling shows this is a major hog). */
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if (pst && STREQ (namestring, pst->filename))
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continue;
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{
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register int i;
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for (i = 0; i < includes_used; i++)
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if (STREQ (namestring, psymtab_include_list[i]))
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{
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i = -1;
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break;
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}
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if (i == -1)
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continue;
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}
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#ifdef DBXREAD_ONLY
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record_include_file:
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#endif
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psymtab_include_list[includes_used++] = namestring;
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if (includes_used >= includes_allocated)
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{
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char **orig = psymtab_include_list;
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psymtab_include_list = (char **)
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alloca ((includes_allocated *= 2) *
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sizeof (char *));
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memcpy ((PTR)psymtab_include_list, (PTR)orig,
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includes_used * sizeof (char *));
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}
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continue;
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}
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case N_LSYM: /* Typedef or automatic variable. */
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case N_STSYM: /* Data seg var -- static */
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case N_LCSYM: /* BSS " */
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case N_ROSYM: /* Read-only data seg var -- static. */
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case N_NBSTS: /* Gould nobase. */
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case N_NBLCS: /* symbols. */
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case N_FUN:
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case N_GSYM: /* Global (extern) variable; can be
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data or bss (sigh FIXME). */
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/* Following may probably be ignored; I'll leave them here
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for now (until I do Pascal and Modula 2 extensions). */
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case N_PC: /* I may or may not need this; I
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suspect not. */
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case N_M2C: /* I suspect that I can ignore this here. */
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case N_SCOPE: /* Same. */
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SET_NAMESTRING();
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p = (char *) strchr (namestring, ':');
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if (!p)
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continue; /* Not a debugging symbol. */
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/* Main processing section for debugging symbols which
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the initial read through the symbol tables needs to worry
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about. If we reach this point, the symbol which we are
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considering is definitely one we are interested in.
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p must also contain the (valid) index into the namestring
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which indicates the debugging type symbol. */
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switch (p[1])
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{
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case 'S':
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CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_DATA);
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ADD_PSYMBOL_ADDR_TO_LIST (namestring, p - namestring,
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VAR_NAMESPACE, LOC_STATIC,
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objfile->static_psymbols,
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CUR_SYMBOL_VALUE,
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psymtab_language, objfile);
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continue;
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case 'G':
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CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_DATA);
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/* The addresses in these entries are reported to be
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wrong. See the code that reads 'G's for symtabs. */
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ADD_PSYMBOL_ADDR_TO_LIST (namestring, p - namestring,
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VAR_NAMESPACE, LOC_STATIC,
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objfile->global_psymbols,
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CUR_SYMBOL_VALUE,
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psymtab_language, objfile);
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continue;
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case 'T':
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if (p != namestring) /* a name is there, not just :T... */
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{
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ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
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STRUCT_NAMESPACE, LOC_TYPEDEF,
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objfile->static_psymbols,
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CUR_SYMBOL_VALUE,
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psymtab_language, objfile);
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if (p[2] == 't')
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{
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/* Also a typedef with the same name. */
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ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
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VAR_NAMESPACE, LOC_TYPEDEF,
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objfile->static_psymbols,
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CUR_SYMBOL_VALUE, psymtab_language,
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objfile);
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p += 1;
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}
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/* The semantics of C++ state that "struct foo { ... }"
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also defines a typedef for "foo". Unfortuantely, cfront
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never makes the typedef when translating from C++ to C.
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We make the typedef here so that "ptype foo" works as
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expected for cfront translated code. */
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else if (psymtab_language == language_cplus)
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{
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/* Also a typedef with the same name. */
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ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
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VAR_NAMESPACE, LOC_TYPEDEF,
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objfile->static_psymbols,
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CUR_SYMBOL_VALUE, psymtab_language,
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objfile);
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}
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}
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goto check_enum;
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case 't':
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if (p != namestring) /* a name is there, not just :T... */
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{
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ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
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VAR_NAMESPACE, LOC_TYPEDEF,
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objfile->static_psymbols,
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CUR_SYMBOL_VALUE,
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psymtab_language, objfile);
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}
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check_enum:
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/* If this is an enumerated type, we need to
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add all the enum constants to the partial symbol
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table. This does not cover enums without names, e.g.
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"enum {a, b} c;" in C, but fortunately those are
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rare. There is no way for GDB to find those from the
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enum type without spending too much time on it. Thus
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to solve this problem, the compiler needs to put out the
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enum in a nameless type. GCC2 does this. */
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/* We are looking for something of the form
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<name> ":" ("t" | "T") [<number> "="] "e"
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{<constant> ":" <value> ","} ";". */
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/* Skip over the colon and the 't' or 'T'. */
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p += 2;
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/* This type may be given a number. Also, numbers can come
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in pairs like (0,26). Skip over it. */
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while ((*p >= '0' && *p <= '9')
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|| *p == '(' || *p == ',' || *p == ')'
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|| *p == '=')
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p++;
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if (*p++ == 'e')
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{
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/* We have found an enumerated type. */
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/* According to comments in read_enum_type
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a comma could end it instead of a semicolon.
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I don't know where that happens.
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Accept either. */
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while (*p && *p != ';' && *p != ',')
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{
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char *q;
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/* Check for and handle cretinous dbx symbol name
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continuation! */
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if (*p == '\\' || (*p == '?' && p[1] == '\0'))
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p = next_symbol_text ();
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/* Point to the character after the name
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of the enum constant. */
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for (q = p; *q && *q != ':'; q++)
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;
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/* Note that the value doesn't matter for
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enum constants in psymtabs, just in symtabs. */
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ADD_PSYMBOL_TO_LIST (p, q - p,
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VAR_NAMESPACE, LOC_CONST,
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objfile->static_psymbols, 0,
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psymtab_language, objfile);
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/* Point past the name. */
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p = q;
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/* Skip over the value. */
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while (*p && *p != ',')
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p++;
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/* Advance past the comma. */
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if (*p)
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p++;
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}
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}
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continue;
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case 'c':
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/* Constant, e.g. from "const" in Pascal. */
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ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
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VAR_NAMESPACE, LOC_CONST,
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objfile->static_psymbols, CUR_SYMBOL_VALUE,
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psymtab_language, objfile);
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continue;
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case 'f':
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CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_TEXT);
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#ifdef DBXREAD_ONLY
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/* Kludges for ELF/STABS with Sun ACC */
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last_function_name = namestring;
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/* Do not fix textlow==0 for .o or NLM files, as 0 is a legit
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value for the bottom of the text seg in those cases. */
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if (pst && pst->textlow == 0 && !symfile_relocatable)
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pst->textlow = CUR_SYMBOL_VALUE;
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#if 0
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if (startup_file_end == 0)
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startup_file_end = CUR_SYMBOL_VALUE;
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#endif
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/* End kludge. */
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#endif /* DBXREAD_ONLY */
|
|
ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
|
|
VAR_NAMESPACE, LOC_BLOCK,
|
|
objfile->static_psymbols, CUR_SYMBOL_VALUE,
|
|
psymtab_language, objfile);
|
|
continue;
|
|
|
|
/* Global functions were ignored here, but now they
|
|
are put into the global psymtab like one would expect.
|
|
They're also in the minimal symbol table. */
|
|
case 'F':
|
|
CUR_SYMBOL_VALUE += ANOFFSET (section_offsets, SECT_OFF_TEXT);
|
|
#ifdef DBXREAD_ONLY
|
|
/* Kludges for ELF/STABS with Sun ACC */
|
|
last_function_name = namestring;
|
|
/* Do not fix textlow==0 for .o or NLM files, as 0 is a legit
|
|
value for the bottom of the text seg in those cases. */
|
|
if (pst && pst->textlow == 0 && !symfile_relocatable)
|
|
pst->textlow = CUR_SYMBOL_VALUE;
|
|
#if 0
|
|
if (startup_file_end == 0)
|
|
startup_file_end = CUR_SYMBOL_VALUE;
|
|
#endif
|
|
/* End kludge. */
|
|
#endif /* DBXREAD_ONLY */
|
|
ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
|
|
VAR_NAMESPACE, LOC_BLOCK,
|
|
objfile->global_psymbols, CUR_SYMBOL_VALUE,
|
|
psymtab_language, objfile);
|
|
continue;
|
|
|
|
/* Two things show up here (hopefully); static symbols of
|
|
local scope (static used inside braces) or extensions
|
|
of structure symbols. We can ignore both. */
|
|
case 'V':
|
|
case '(':
|
|
case '0':
|
|
case '1':
|
|
case '2':
|
|
case '3':
|
|
case '4':
|
|
case '5':
|
|
case '6':
|
|
case '7':
|
|
case '8':
|
|
case '9':
|
|
continue;
|
|
|
|
case ':':
|
|
/* It is a C++ nested symbol. We don't need to record it
|
|
(I don't think); if we try to look up foo::bar::baz,
|
|
then symbols for the symtab containing foo should get
|
|
read in, I think. */
|
|
/* Someone says sun cc puts out symbols like
|
|
/foo/baz/maclib::/usr/local/bin/maclib,
|
|
which would get here with a symbol type of ':'. */
|
|
continue;
|
|
|
|
default:
|
|
/* Unexpected symbol descriptor. The second and subsequent stabs
|
|
of a continued stab can show up here. The question is
|
|
whether they ever can mimic a normal stab--it would be
|
|
nice if not, since we certainly don't want to spend the
|
|
time searching to the end of every string looking for
|
|
a backslash. */
|
|
|
|
complain (&unknown_symchar_complaint, p[1]);
|
|
|
|
/* Ignore it; perhaps it is an extension that we don't
|
|
know about. */
|
|
continue;
|
|
}
|
|
|
|
case N_EXCL:
|
|
#ifdef DBXREAD_ONLY
|
|
|
|
SET_NAMESTRING();
|
|
|
|
/* Find the corresponding bincl and mark that psymtab on the
|
|
psymtab dependency list */
|
|
{
|
|
struct partial_symtab *needed_pst =
|
|
find_corresponding_bincl_psymtab (namestring, CUR_SYMBOL_VALUE);
|
|
|
|
/* If this include file was defined earlier in this file,
|
|
leave it alone. */
|
|
if (needed_pst == pst) continue;
|
|
|
|
if (needed_pst)
|
|
{
|
|
int i;
|
|
int found = 0;
|
|
|
|
for (i = 0; i < dependencies_used; i++)
|
|
if (dependency_list[i] == needed_pst)
|
|
{
|
|
found = 1;
|
|
break;
|
|
}
|
|
|
|
/* If it's already in the list, skip the rest. */
|
|
if (found) continue;
|
|
|
|
dependency_list[dependencies_used++] = needed_pst;
|
|
if (dependencies_used >= dependencies_allocated)
|
|
{
|
|
struct partial_symtab **orig = dependency_list;
|
|
dependency_list =
|
|
(struct partial_symtab **)
|
|
alloca ((dependencies_allocated *= 2)
|
|
* sizeof (struct partial_symtab *));
|
|
memcpy ((PTR)dependency_list, (PTR)orig,
|
|
(dependencies_used
|
|
* sizeof (struct partial_symtab *)));
|
|
#ifdef DEBUG_INFO
|
|
fprintf_unfiltered (gdb_stderr, "Had to reallocate dependency list.\n");
|
|
fprintf_unfiltered (gdb_stderr, "New dependencies allocated: %d\n",
|
|
dependencies_allocated);
|
|
#endif
|
|
}
|
|
}
|
|
}
|
|
#endif /* DBXREAD_ONLY */
|
|
continue;
|
|
|
|
case N_RBRAC:
|
|
#ifdef HANDLE_RBRAC
|
|
HANDLE_RBRAC(CUR_SYMBOL_VALUE);
|
|
continue;
|
|
#endif
|
|
case N_EINCL:
|
|
case N_DSLINE:
|
|
case N_BSLINE:
|
|
case N_SSYM: /* Claim: Structure or union element.
|
|
Hopefully, I can ignore this. */
|
|
case N_ENTRY: /* Alternate entry point; can ignore. */
|
|
case N_MAIN: /* Can definitely ignore this. */
|
|
case N_CATCH: /* These are GNU C++ extensions */
|
|
case N_EHDECL: /* that can safely be ignored here. */
|
|
case N_LENG:
|
|
case N_BCOMM:
|
|
case N_ECOMM:
|
|
case N_ECOML:
|
|
case N_FNAME:
|
|
case N_SLINE:
|
|
case N_RSYM:
|
|
case N_PSYM:
|
|
case N_LBRAC:
|
|
case N_NSYMS: /* Ultrix 4.0: symbol count */
|
|
case N_DEFD: /* GNU Modula-2 */
|
|
|
|
case N_OBJ: /* useless types from Solaris */
|
|
case N_OPT:
|
|
case N_ENDM:
|
|
/* These symbols aren't interesting; don't worry about them */
|
|
|
|
continue;
|
|
|
|
default:
|
|
/* If we haven't found it yet, ignore it. It's probably some
|
|
new type we don't know about yet. */
|
|
complain (&unknown_symtype_complaint,
|
|
local_hex_string (CUR_SYMBOL_TYPE));
|
|
continue;
|
|
}
|