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