466 lines
11 KiB
C
466 lines
11 KiB
C
/* Generic stabs parsing for gas.
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Copyright (C) 1989, 1990, 1991, 1993 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS 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
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published by the Free Software Foundation; either version 2,
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or (at your option) any later version.
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GAS is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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the GNU General Public License for more details.
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You should have received a copy of the GNU General Public
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License along with GAS; see the file COPYING. If not, write
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to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "as.h"
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#include "libiberty.h"
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#include "obstack.h"
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#include "subsegs.h"
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/* We need this, despite the apparent object format dependency, since
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it defines stab types, which all object formats can use now. */
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#include "aout/stab_gnu.h"
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/* Allow backends to override the names used for the stab sections. */
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#ifndef STAB_SECTION_NAME
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#define STAB_SECTION_NAME ".stab"
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#endif
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#ifndef STAB_STRING_SECTION_NAME
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#define STAB_STRING_SECTION_NAME ".stabstr"
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#endif
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/*
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* Handle .stabX directives, which used to be open-coded.
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* So much creeping featurism overloaded the semantics that we decided
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* to put all .stabX thinking in one place. Here.
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*
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* We try to make any .stabX directive legal. Other people's AS will often
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* do assembly-time consistency checks: eg assigning meaning to n_type bits
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* and "protecting" you from setting them to certain values. (They also zero
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* certain bits before emitting symbols. Tut tut.)
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*
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* If an expression is not absolute we either gripe or use the relocation
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* information. Other people's assemblers silently forget information they
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* don't need and invent information they need that you didn't supply.
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*/
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/*
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* Build a string dictionary entry for a .stabX symbol.
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* The symbol is added to the .<secname>str section.
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*/
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#ifndef SEPARATE_STAB_SECTIONS
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#define SEPARATE_STAB_SECTIONS 0
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#endif
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unsigned int
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get_stab_string_offset (string, stabstr_secname)
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const char *string;
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const char *stabstr_secname;
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{
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unsigned int length;
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unsigned int retval;
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if (! SEPARATE_STAB_SECTIONS)
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abort ();
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retval = 0;
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length = strlen (string);
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if (length > 0)
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{ /* Ordinary case. */
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segT save_seg;
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subsegT save_subseg;
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segT seg;
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char *p;
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save_seg = now_seg;
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save_subseg = now_subseg;
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/* Create the stab string section. */
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seg = subseg_new (stabstr_secname, 0);
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retval = seg_info (seg)->stabu.stab_string_size;
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if (retval <= 0)
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{
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/* Make sure the first string is empty. */
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p = frag_more (1);
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*p = 0;
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retval = seg_info (seg)->stabu.stab_string_size = 1;
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#ifdef BFD_ASSEMBLER
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bfd_set_section_flags (stdoutput, seg, SEC_READONLY | SEC_DEBUGGING);
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if (seg->name == stabstr_secname)
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seg->name = xstrdup (stabstr_secname);
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#endif
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}
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p = frag_more (length + 1);
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strcpy (p, string);
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seg_info (seg)->stabu.stab_string_size += length + 1;
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subseg_set (save_seg, save_subseg);
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}
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return retval;
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}
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#ifdef AOUT_STABS
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#ifndef OBJ_PROCESS_STAB
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#define OBJ_PROCESS_STAB(SEG,W,S,T,O,D) aout_process_stab(W,S,T,O,D)
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#endif
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static void
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aout_process_stab (what, string, type, other, desc)
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int what;
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const char *string;
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int type, other, desc;
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{
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/* Put the stab information in the symbol table. */
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symbolS *symbol;
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/* Create the symbol now, but only insert it into the symbol chain
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after any symbols mentioned in the value expression get into the
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symbol chain. This is to avoid "continuation symbols" (where one
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ends in "\" and the debug info is continued in the next .stabs
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directive) from being separated by other random symbols. */
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symbol = symbol_create (string, undefined_section, 0,
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(struct frag *) NULL);
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if (what == 's' || what == 'n')
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{
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/* Pick up the value from the input line. */
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symbol->sy_frag = &zero_address_frag;
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pseudo_set (symbol);
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}
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else
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{
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/* .stabd sets the name to NULL. Why? */
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S_SET_NAME (symbol, NULL);
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symbol->sy_frag = frag_now;
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S_SET_VALUE (symbol, (valueT) frag_now_fix ());
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}
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symbol_append (symbol, symbol_lastP, &symbol_rootP, &symbol_lastP);
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S_SET_TYPE (symbol, type);
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S_SET_OTHER (symbol, other);
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S_SET_DESC (symbol, desc);
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}
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#endif
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/* This can handle different kinds of stabs (s,n,d) and different
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kinds of stab sections. */
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static void
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s_stab_generic (what, stab_secname, stabstr_secname)
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int what;
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char *stab_secname;
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char *stabstr_secname;
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{
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long longint;
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char *string;
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int type;
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int other;
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int desc;
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/* The general format is:
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.stabs "STRING",TYPE,OTHER,DESC,VALUE
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.stabn TYPE,OTHER,DESC,VALUE
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.stabd TYPE,OTHER,DESC
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At this point input_line_pointer points after the pseudo-op and
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any trailing whitespace. The argument what is one of 's', 'n' or
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'd' indicating which type of .stab this is. */
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if (what != 's')
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string = "";
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else
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{
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int length;
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string = demand_copy_C_string (&length);
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SKIP_WHITESPACE ();
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if (*input_line_pointer == ',')
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input_line_pointer++;
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else
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{
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as_warn (".stabs: Missing comma");
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ignore_rest_of_line ();
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return;
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}
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}
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if (get_absolute_expression_and_terminator (&longint) != ',')
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{
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as_warn (".stab%c: Missing comma", what);
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ignore_rest_of_line ();
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return;
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}
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type = longint;
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if (get_absolute_expression_and_terminator (&longint) != ',')
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{
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as_warn (".stab%c: Missing comma", what);
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ignore_rest_of_line ();
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return;
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}
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other = longint;
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desc = get_absolute_expression ();
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if (what == 's' || what == 'n')
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{
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if (*input_line_pointer != ',')
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{
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as_warn (".stab%c: Missing comma", what);
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ignore_rest_of_line ();
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return;
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}
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input_line_pointer++;
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SKIP_WHITESPACE ();
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}
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#ifdef TC_PPC
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#ifdef OBJ_ELF
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/* Solaris on PowerPC has decided that .stabd takes 4 arguments, so emulate it. */
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else if (what == 'd')
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{
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char *save_location = input_line_pointer;
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SKIP_WHITESPACE ();
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if (*input_line_pointer == ',')
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{
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int dummy;
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input_line_pointer++;
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SKIP_WHITESPACE ();
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dummy = get_absolute_expression ();
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if (dummy != 0)
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{
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as_warn (".stabd: Fourth field must be 0");
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ignore_rest_of_line ();
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return;
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}
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SKIP_WHITESPACE ();
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}
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else
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input_line_pointer = save_location;
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}
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#endif /* OBJ_ELF */
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#endif /* TC_PPC */
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#ifndef NO_LISTING
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if (listing)
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{
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switch (type)
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{
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case N_SLINE:
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listing_source_line ((unsigned int) desc);
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break;
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case N_SO:
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case N_SOL:
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listing_source_file (string);
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break;
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}
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}
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#endif /* ! NO_LISTING */
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/* We have now gathered the type, other, and desc information. For
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.stabs or .stabn, input_line_pointer is now pointing at the
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value. */
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if (SEPARATE_STAB_SECTIONS)
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/* Output the stab information in a separate section. This is used
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at least for COFF and ELF. */
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{
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segT saved_seg = now_seg;
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subsegT saved_subseg = now_subseg;
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fragS *saved_frag = frag_now;
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valueT dot;
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segT seg;
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unsigned int stroff;
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char *p;
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static segT cached_sec;
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static char *cached_secname;
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dot = frag_now_fix ();
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if (cached_secname && !strcmp (cached_secname, stab_secname))
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{
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seg = cached_sec;
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subseg_set (seg, 0);
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}
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else
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{
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seg = subseg_new (stab_secname, 0);
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if (cached_secname)
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free (cached_secname);
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cached_secname = xstrdup (stab_secname);
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cached_sec = seg;
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}
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if (! seg_info (seg)->hadone)
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{
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#ifdef BFD_ASSEMBLER
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bfd_set_section_flags (stdoutput, seg,
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SEC_READONLY | SEC_RELOC | SEC_DEBUGGING);
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#endif
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#ifdef INIT_STAB_SECTION
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INIT_STAB_SECTION (seg);
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#endif
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seg_info (seg)->hadone = 1;
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}
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stroff = get_stab_string_offset (string, stabstr_secname);
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if (what == 's')
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{
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/* release the string */
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obstack_free (¬es, string);
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}
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/* At least for now, stabs in a special stab section are always
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output as 12 byte blocks of information. */
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p = frag_more (8);
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md_number_to_chars (p, (valueT) stroff, 4);
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md_number_to_chars (p + 4, (valueT) type, 1);
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md_number_to_chars (p + 5, (valueT) other, 1);
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md_number_to_chars (p + 6, (valueT) desc, 2);
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if (what == 's' || what == 'n')
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{
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/* Pick up the value from the input line. */
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cons (4);
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input_line_pointer--;
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}
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else
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{
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const char *fake;
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symbolS *symbol;
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expressionS exp;
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/* Arrange for a value representing the current location. */
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fake = FAKE_LABEL_NAME;
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symbol = symbol_new (fake, saved_seg, dot, saved_frag);
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exp.X_op = O_symbol;
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exp.X_add_symbol = symbol;
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exp.X_add_number = 0;
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emit_expr (&exp, 4);
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}
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#ifdef OBJ_PROCESS_STAB
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OBJ_PROCESS_STAB (seg, what, string, type, other, desc);
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#endif
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subseg_set (saved_seg, saved_subseg);
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}
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else
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{
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#ifdef OBJ_PROCESS_STAB
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OBJ_PROCESS_STAB (0, what, string, type, other, desc);
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#else
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abort ();
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#endif
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}
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demand_empty_rest_of_line ();
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}
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/* Regular stab directive. */
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void
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s_stab (what)
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int what;
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{
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s_stab_generic (what, STAB_SECTION_NAME, STAB_STRING_SECTION_NAME);
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}
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/* "Extended stabs", used in Solaris only now. */
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void
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s_xstab (what)
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int what;
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{
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int length;
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char *stab_secname, *stabstr_secname;
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static char *saved_secname, *saved_strsecname;
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/* @@ MEMORY LEAK: This allocates a copy of the string, but in most
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cases it will be the same string, so we could release the storage
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back to the obstack it came from. */
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stab_secname = demand_copy_C_string (&length);
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SKIP_WHITESPACE ();
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if (*input_line_pointer == ',')
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input_line_pointer++;
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else
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{
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as_bad ("comma missing in .xstabs");
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ignore_rest_of_line ();
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return;
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}
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/* To get the name of the stab string section, simply add "str" to
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the stab section name. */
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if (saved_secname == 0 || strcmp (saved_secname, stab_secname))
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{
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stabstr_secname = (char *) xmalloc (strlen (stab_secname) + 4);
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strcpy (stabstr_secname, stab_secname);
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strcat (stabstr_secname, "str");
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if (saved_secname)
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{
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free (saved_secname);
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free (saved_strsecname);
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}
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saved_secname = stab_secname;
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saved_strsecname = stabstr_secname;
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}
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s_stab_generic (what, saved_secname, saved_strsecname);
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}
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#ifdef S_SET_DESC
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/* Frob invented at RMS' request. Set the n_desc of a symbol. */
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void
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s_desc (ignore)
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int ignore;
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{
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char *name;
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char c;
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char *p;
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symbolS *symbolP;
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int temp;
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name = input_line_pointer;
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c = get_symbol_end ();
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p = input_line_pointer;
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*p = c;
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SKIP_WHITESPACE ();
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if (*input_line_pointer != ',')
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{
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*p = 0;
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as_bad ("Expected comma after name \"%s\"", name);
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*p = c;
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ignore_rest_of_line ();
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}
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else
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{
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input_line_pointer++;
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temp = get_absolute_expression ();
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*p = 0;
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symbolP = symbol_find_or_make (name);
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*p = c;
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S_SET_DESC (symbolP, temp);
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}
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demand_empty_rest_of_line ();
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} /* s_desc() */
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#endif /* defined (S_SET_DESC) */
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