/* Generic stabs parsing for gas.
- Copyright (C) 1989, 90, 91, 93, 94, 95, 96, 97, 98, 1999
- Free Software Foundation, Inc.
+ Copyright (C) 1989-2021 Free Software Foundation, Inc.
-This file is part of GAS, the GNU Assembler.
+ 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 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 3,
+ 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.
+ 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. */
+ 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, 51 Franklin Street - Fifth Floor, Boston, MA
+ 02110-1301, USA. */
#include "as.h"
+#include "filenames.h"
#include "obstack.h"
#include "subsegs.h"
#include "ecoff.h"
/* We need this, despite the apparent object format dependency, since
- it defines stab types, which all object formats can use now. */
+ it defines stab types, which all object formats can use now. */
#include "aout/stab_gnu.h"
-static void s_stab_generic PARAMS ((int, char *, char *));
-static void generate_asm_file PARAMS ((int, char *));
+/* Holds whether the assembler is generating stabs line debugging
+ information or not. Potentially used by md_cleanup function. */
+
+int outputting_stabs_line_debug = 0;
+
+static void generate_asm_file (int, const char *);
/* Allow backends to override the names used for the stab sections. */
#ifndef STAB_SECTION_NAME
#define STAB_STRING_SECTION_NAME ".stabstr"
#endif
-/* Non-zero if we're in the middle of a .func function, in which case
+/* True if we're in the middle of a .func function, in which case
stabs_generate_asm_lineno emits function relative line number stabs.
Otherwise it emits line number stabs with absolute addresses. Note that
both cases only apply to assembler code assembled with -gstabs. */
-static int in_dot_func_p;
+static bfd_boolean in_dot_func_p = FALSE;
-/* Label at start of current function if in_dot_func_p != 0. */
+/* Label at start of current function if in_dot_func_p != FALSE. */
static const char *current_function_label;
/*
#endif
unsigned int
-get_stab_string_offset (string, stabstr_secname)
- const char *string;
- const char *stabstr_secname;
+get_stab_string_offset (const char *string, const char *stabstr_secname,
+ bfd_boolean free_stabstr_secname)
{
unsigned int length;
unsigned int retval;
save_seg = now_seg;
save_subseg = now_subseg;
- /* Create the stab string section. */
+ /* Create the stab string section, if it doesn't already exist. */
seg = subseg_new (stabstr_secname, 0);
+ if (free_stabstr_secname && seg->name != stabstr_secname)
+ free ((char *) stabstr_secname);
retval = seg_info (seg)->stabu.stab_string_size;
if (retval <= 0)
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);
- if (seg->name == stabstr_secname)
- seg->name = xstrdup (stabstr_secname);
-#endif
+ bfd_set_section_flags (seg, SEC_READONLY | SEC_DEBUGGING);
}
if (length > 0)
- { /* Ordinary case. */
+ { /* Ordinary case. */
p = frag_more (length + 1);
strcpy (p, string);
#define OBJ_PROCESS_STAB(SEG,W,S,T,O,D) aout_process_stab(W,S,T,O,D)
#endif
-static void aout_process_stab PARAMS ((int, const char *, int, int, int));
-
-static void
-aout_process_stab (what, string, type, other, desc)
- int what;
- const char *string;
- int type, other, desc;
+/* Here instead of obj-aout.c because other formats use it too. */
+void
+aout_process_stab (int what, const char *string, int type, int other, int desc)
{
/* Put the stab information in the symbol table. */
symbolS *symbol;
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);
+ symbol = symbol_create (string, undefined_section, &zero_address_frag, 0);
if (what == 's' || what == 'n')
{
/* Pick up the value from the input line. */
- symbol_set_frag (symbol, &zero_address_frag);
pseudo_set (symbol);
}
else
symbol_append (symbol, symbol_lastP, &symbol_rootP, &symbol_lastP);
+ symbol_get_bfdsym (symbol)->flags |= BSF_DEBUGGING;
+
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. */
+ kinds of stab sections. If STAB_SECNAME_OBSTACK_END is non-NULL,
+ then STAB_SECNAME and STABSTR_SECNAME will be freed if possible
+ before this function returns (the former by obstack_free). */
-static void
-s_stab_generic (what, stab_secname, stabstr_secname)
- int what;
- char *stab_secname;
- char *stabstr_secname;
+static void
+s_stab_generic (int what,
+ const char *stab_secname,
+ const char *stabstr_secname,
+ const char *stab_secname_obstack_end)
{
long longint;
- char *string;
+ const char *string;
+ char *saved_string_obstack_end;
int type;
int other;
int desc;
'd' indicating which type of .stab this is. */
if (what != 's')
- string = "";
+ {
+ string = "";
+ saved_string_obstack_end = 0;
+ }
else
{
int length;
string = demand_copy_C_string (&length);
+ if (string == NULL)
+ {
+ as_warn (_(".stab%c: missing string"), what);
+ ignore_rest_of_line ();
+ return;
+ }
+ /* FIXME: We should probably find some other temporary storage
+ for string, rather than leaking memory if someone else
+ happens to use the notes obstack. */
+ saved_string_obstack_end = obstack_next_free (¬es);
SKIP_WHITESPACE ();
if (*input_line_pointer == ',')
input_line_pointer++;
else
{
- as_warn (_(".stabs: Missing comma"));
+ as_warn (_(".stab%c: missing comma"), what);
ignore_rest_of_line ();
return;
}
if (get_absolute_expression_and_terminator (&longint) != ',')
{
- as_warn (_(".stab%c: Missing comma"), what);
+ as_warn (_(".stab%c: missing comma"), what);
ignore_rest_of_line ();
return;
}
if (get_absolute_expression_and_terminator (&longint) != ',')
{
- as_warn (_(".stab%c: Missing comma"), what);
+ as_warn (_(".stab%c: missing comma"), what);
ignore_rest_of_line ();
return;
}
other = longint;
desc = get_absolute_expression ();
+
+ if ((desc > 0xffff) || (desc < -0x8000))
+ /* This could happen for example with a source file with a huge
+ number of lines. The only cure is to use a different debug
+ format, probably DWARF. */
+ as_warn (_(".stab%c: description field '%x' too big, try a different debug format"),
+ what, desc);
+
if (what == 's' || what == 'n')
{
if (*input_line_pointer != ',')
{
- as_warn (_(".stab%c: Missing comma"), what);
+ as_warn (_(".stab%c: missing comma"), what);
ignore_rest_of_line ();
return;
}
char *p;
static segT cached_sec;
- static char *cached_secname;
dot = frag_now_fix ();
md_flush_pending_output ();
#endif
- if (cached_secname && !strcmp (cached_secname, stab_secname))
+ if (cached_sec && strcmp (cached_sec->name, stab_secname) == 0)
{
seg = cached_sec;
subseg_set (seg, 0);
else
{
seg = subseg_new (stab_secname, 0);
- if (cached_secname)
- free (cached_secname);
- cached_secname = xstrdup (stab_secname);
cached_sec = seg;
}
if (! seg_info (seg)->hadone)
{
-#ifdef BFD_ASSEMBLER
- bfd_set_section_flags (stdoutput, seg,
+ bfd_set_section_flags (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);
- if (what == 's')
- {
- /* release the string */
- obstack_free (¬es, string);
- }
+ stroff = get_stab_string_offset (string, stabstr_secname,
+ stab_secname_obstack_end != NULL);
+
+ /* Release the string, if nobody else has used the obstack. */
+ if (saved_string_obstack_end != NULL
+ && saved_string_obstack_end == obstack_next_free (¬es))
+ obstack_free (¬es, string);
+ /* Similarly for the section name. This must be done before
+ creating symbols below, which uses the notes obstack. */
+ if (seg->name != stab_secname
+ && stab_secname_obstack_end != NULL
+ && stab_secname_obstack_end == obstack_next_free (¬es))
+ obstack_free (¬es, stab_secname);
/* At least for now, stabs in a special stab section are always
output as 12 byte blocks of information. */
}
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);
+ symbol = symbol_temp_new (saved_seg, saved_frag, dot);
exp.X_op = O_symbol;
exp.X_add_symbol = symbol;
}
else
{
+ if (stab_secname_obstack_end != NULL)
+ {
+ free ((char *) stabstr_secname);
+ if (stab_secname_obstack_end == obstack_next_free (¬es))
+ obstack_free (¬es, stab_secname);
+ }
#ifdef OBJ_PROCESS_STAB
OBJ_PROCESS_STAB (0, what, string, type, other, desc);
#else
demand_empty_rest_of_line ();
}
-/* Regular stab directive. */
+/* Regular stab directive. */
void
-s_stab (what)
- int what;
+s_stab (int what)
{
- s_stab_generic (what, STAB_SECTION_NAME, STAB_STRING_SECTION_NAME);
+ s_stab_generic (what, STAB_SECTION_NAME, STAB_STRING_SECTION_NAME, NULL);
}
-/* "Extended stabs", used in Solaris only now. */
+/* "Extended stabs", used in Solaris only now. */
void
-s_xstab (what)
- int what;
+s_xstab (int what)
{
int length;
- char *stab_secname, *stabstr_secname;
- static char *saved_secname, *saved_strsecname;
+ char *stab_secname, *stabstr_secname, *stab_secname_obstack_end;
- /* @@ MEMORY LEAK: This allocates a copy of the string, but in most
- cases it will be the same string, so we could release the storage
- back to the obstack it came from. */
stab_secname = demand_copy_C_string (&length);
+ stab_secname_obstack_end = obstack_next_free (¬es);
SKIP_WHITESPACE ();
if (*input_line_pointer == ',')
input_line_pointer++;
/* To get the name of the stab string section, simply add "str" to
the stab section name. */
- if (saved_secname == 0 || strcmp (saved_secname, stab_secname))
- {
- stabstr_secname = (char *) xmalloc (strlen (stab_secname) + 4);
- strcpy (stabstr_secname, stab_secname);
- strcat (stabstr_secname, "str");
- if (saved_secname)
- {
- free (saved_secname);
- free (saved_strsecname);
- }
- saved_secname = stab_secname;
- saved_strsecname = stabstr_secname;
- }
- s_stab_generic (what, saved_secname, saved_strsecname);
+ stabstr_secname = concat (stab_secname, "str", (char *) NULL);
+ s_stab_generic (what, stab_secname, stabstr_secname,
+ stab_secname_obstack_end);
}
#ifdef S_SET_DESC
/* Frob invented at RMS' request. Set the n_desc of a symbol. */
-void
-s_desc (ignore)
- int ignore;
+void
+s_desc (int ignore ATTRIBUTE_UNUSED)
{
char *name;
char c;
symbolS *symbolP;
int temp;
- name = input_line_pointer;
- c = get_symbol_end ();
+ c = get_symbol_name (&name);
p = input_line_pointer;
*p = c;
- SKIP_WHITESPACE ();
+ SKIP_WHITESPACE_AFTER_NAME ();
if (*input_line_pointer != ',')
{
*p = 0;
- as_bad (_("Expected comma after name \"%s\""), name);
+ as_bad (_("expected comma after \"%s\""), name);
*p = c;
ignore_rest_of_line ();
}
/* Generate stabs debugging information to denote the main source file. */
void
-stabs_generate_asm_file ()
+stabs_generate_asm_file (void)
{
- char *file;
+ const char *file;
unsigned int lineno;
- as_where (&file, &lineno);
+ file = as_where (&lineno);
+ if (use_gnu_debug_info_extensions)
+ {
+ const char *dir;
+ char *dir2;
+
+ dir = remap_debug_filename (getpwd ());
+ dir2 = concat (dir, "/", NULL);
+ generate_asm_file (N_SO, dir2);
+ free (dir2);
+ xfree ((char *) dir);
+ }
generate_asm_file (N_SO, file);
}
TYPE is one of N_SO, N_SOL. */
static void
-generate_asm_file (type, file)
- int type;
- char *file;
+generate_asm_file (int type, const char *file)
{
static char *last_file;
static int label_count;
- char *hold;
- char buf[100];
char sym[30];
+ char *buf;
+ const char *tmp = file;
+ const char *file_endp = file + strlen (file);
+ char *bufp;
+
+ if (last_file != NULL
+ && filename_cmp (last_file, file) == 0)
+ return;
/* Rather than try to do this in some efficient fashion, we just
generate a string and then parse it again. That lets us use the
existing stabs hook, which expect to see a string, rather than
inventing new ones. */
+ sprintf (sym, "%sF%d", FAKE_LABEL_NAME, label_count);
+ ++label_count;
+
+ /* Allocate enough space for the file name (possibly extended with
+ doubled up backslashes), the symbol name, and the other characters
+ that make up a stabs file directive. */
+ bufp = buf = XNEWVEC (char, 2 * strlen (file) + strlen (sym) + 12);
- hold = input_line_pointer;
+ *bufp++ = '"';
- if (last_file == NULL
- || strcmp (last_file, file) != 0)
+ while (tmp < file_endp)
{
- sprintf (sym, "%sF%d", FAKE_LABEL_NAME, label_count);
- ++label_count;
+ const char *bslash = strchr (tmp, '\\');
+ size_t len = bslash != NULL ? bslash - tmp + 1 : file_endp - tmp;
- sprintf (buf, "\"%s\",%d,0,0,%s\n", file, type, sym);
- input_line_pointer = buf;
- s_stab ('s');
- colon (sym);
+ /* Double all backslashes, since demand_copy_C_string (used by
+ s_stab to extract the part in quotes) will try to replace them as
+ escape sequences. backslash may appear in a filespec. */
+ memcpy (bufp, tmp, len);
+
+ tmp += len;
+ bufp += len;
- if (last_file != NULL)
- free (last_file);
- last_file = xstrdup (file);
+ if (bslash != NULL)
+ *bufp++ = '\\';
}
- input_line_pointer = hold;
+ sprintf (bufp, "\",%d,0,0,%s\n", type, sym);
+
+ temp_ilp (buf);
+ s_stab ('s');
+ restore_ilp ();
+
+ colon (sym);
+
+ free (last_file);
+ last_file = xstrdup (file);
+
+ free (buf);
}
/* Generate stabs debugging information for the current line. This is
used to produce debugging information for an assembler file. */
void
-stabs_generate_asm_lineno ()
+stabs_generate_asm_lineno (void)
{
static int label_count;
- char *hold;
- char *file;
+ const char *file;
unsigned int lineno;
char *buf;
char sym[30];
+ /* Remember the last file/line and avoid duplicates. */
+ static unsigned int prev_lineno = -1;
+ static char *prev_file = NULL;
/* Rather than try to do this in some efficient fashion, we just
generate a string and then parse it again. That lets us use the
existing stabs hook, which expect to see a string, rather than
inventing new ones. */
- hold = input_line_pointer;
+ file = as_where (&lineno);
- as_where (&file, &lineno);
+ /* Don't emit sequences of stabs for the same line. */
+ if (prev_file == NULL)
+ {
+ /* First time through. */
+ prev_file = xstrdup (file);
+ prev_lineno = lineno;
+ }
+ else if (lineno == prev_lineno
+ && filename_cmp (file, prev_file) == 0)
+ {
+ /* Same file/line as last time. */
+ return;
+ }
+ else
+ {
+ /* Remember file/line for next time. */
+ prev_lineno = lineno;
+ if (filename_cmp (file, prev_file) != 0)
+ {
+ free (prev_file);
+ prev_file = xstrdup (file);
+ }
+ }
+
+ /* Let the world know that we are in the middle of generating a
+ piece of stabs line debugging information. */
+ outputting_stabs_line_debug = 1;
generate_asm_file (N_SOL, file);
if (in_dot_func_p)
{
- buf = (char *) alloca (100 + strlen (current_function_label));
+ buf = XNEWVEC (char, 100 + strlen (current_function_label));
sprintf (buf, "%d,0,%d,%s-%s\n", N_SLINE, lineno,
sym, current_function_label);
}
else
{
- buf = (char *) alloca (100);
+ buf = XNEWVEC (char, 100);
sprintf (buf, "%d,0,%d,%s\n", N_SLINE, lineno, sym);
}
- input_line_pointer = buf;
+
+ temp_ilp (buf);
s_stab ('n');
+ restore_ilp ();
+
colon (sym);
- input_line_pointer = hold;
+ outputting_stabs_line_debug = 0;
+ free (buf);
}
/* Emit a function stab.
All assembler functions are assumed to have return type `void'. */
void
-stabs_generate_asm_func (funcname, startlabname)
- const char *funcname;
- const char *startlabname;
+stabs_generate_asm_func (const char *funcname, const char *startlabname)
{
- static int void_emitted_p;
- char *hold = input_line_pointer;
+ static bfd_boolean void_emitted_p = FALSE;
char *buf;
- char *file;
unsigned int lineno;
if (! void_emitted_p)
{
- input_line_pointer = "\"void:t1=1\",128,0,0,0";
+ temp_ilp ((char *) "\"void:t1=1\",128,0,0,0");
s_stab ('s');
- void_emitted_p = 1;
+ restore_ilp ();
+ void_emitted_p = TRUE;
}
- as_where (&file, &lineno);
- asprintf (&buf, "\"%s:F1\",%d,0,%d,%s",
- funcname, N_FUN, lineno + 1, startlabname);
- input_line_pointer = buf;
+ as_where (&lineno);
+ if (asprintf (&buf, "\"%s:F1\",%d,0,%d,%s",
+ funcname, N_FUN, lineno + 1, startlabname) == -1)
+ as_fatal ("%s", xstrerror (errno));
+
+ temp_ilp (buf);
s_stab ('s');
+ restore_ilp ();
free (buf);
- input_line_pointer = hold;
current_function_label = xstrdup (startlabname);
- in_dot_func_p = 1;
+ in_dot_func_p = TRUE;
}
/* Emit a stab to record the end of a function. */
void
-stabs_generate_asm_endfunc (funcname, startlabname)
- const char *funcname;
- const char *startlabname;
+stabs_generate_asm_endfunc (const char *funcname ATTRIBUTE_UNUSED,
+ const char *startlabname)
{
static int label_count;
- char *hold = input_line_pointer;
char *buf;
char sym[30];
++label_count;
colon (sym);
- asprintf (&buf, "\"\",%d,0,0,%s-%s", N_FUN, sym, startlabname);
- input_line_pointer = buf;
+ if (asprintf (&buf, "\"\",%d,0,0,%s-%s", N_FUN, sym, startlabname) == -1)
+ as_fatal ("%s", xstrerror (errno));
+
+ temp_ilp (buf);
s_stab ('s');
+ restore_ilp ();
free (buf);
- input_line_pointer = hold;
- in_dot_func_p = 0;
+ in_dot_func_p = FALSE;
current_function_label = NULL;
}
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