From 625f4e4830b978be263b1c1333faf1d5b331dca1 Mon Sep 17 00:00:00 2001 From: Ken Raeburn Date: Wed, 18 Oct 1995 16:26:46 +0000 Subject: [PATCH] * stabs.c (aout_process_stab): Insert debug symbol into symbol chain after parsing value expression, if any, to avoid separating continued .stabs lines. --- gas/ChangeLog | 14 +- gas/stabs.c | 407 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 419 insertions(+), 2 deletions(-) create mode 100644 gas/stabs.c diff --git a/gas/ChangeLog b/gas/ChangeLog index 6e89c7a..f0d9e75 100644 --- a/gas/ChangeLog +++ b/gas/ChangeLog @@ -1,3 +1,9 @@ +Wed Oct 18 12:22:59 1995 Ken Raeburn + + * stabs.c (aout_process_stab): Insert debug symbol into symbol + chain after parsing value expression, if any, to avoid separating + continued .stabs lines. + Mon Oct 16 10:56:41 1995 Ian Lance Taylor * config/tc-mips.c (mips_elf_pseudo_table): Remove. @@ -5,8 +11,12 @@ Mon Oct 16 10:56:41 1995 Ian Lance Taylor Mon Oct 16 07:07:37 1995 Michael Meissner - * config/tc-ppc.c (md_begin): Take -mcom into account for - duplicate cmp instructions. + * config/tc-ppc.c (md_begin): Use new flags PPC_OPCODE_COMMON for + -mcom support and PPC_OPCODE_ANY for -many. + (md_parse_option): Ditto. + (ppc_arch): Ditto. + (md_begin): For duplicate instructions, print all duplicates + before aborting. Sun Oct 15 22:06:14 1995 Michael Meissner diff --git a/gas/stabs.c b/gas/stabs.c new file mode 100644 index 0000000..3ddf680 --- /dev/null +++ b/gas/stabs.c @@ -0,0 +1,407 @@ +/* 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 .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) */ -- 2.7.4