mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-09 04:21:49 +08:00
5e2e79f859
basis. See comments in objfiles.h and details in ChangeLog. Also remove redundant definitions of FRAME_CHAIN_VALID from most of the tm-* files and use a default definition in frame.h.
579 lines
17 KiB
C
579 lines
17 KiB
C
/* Shared code to pre-read a stab (dbx-style), when building a psymtab.
|
|
Copyright (C) 1986-1991 Free Software Foundation, Inc.
|
|
|
|
This file is part of GDB.
|
|
|
|
This program 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 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program 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 this program; if not, write to the Free Software
|
|
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
|
|
|
/* The following need to be defined:
|
|
SET_NAMESTRING() --Set namestring to name of symbol.
|
|
CUR_SYMBOL_TYPE --Type code of current symbol.
|
|
CUR_SYMBOL_VALUE --Value field of current symbol. May be adjusted here.
|
|
*/
|
|
|
|
/* End of macro definitions, now let's handle them symbols! */
|
|
|
|
switch (CUR_SYMBOL_TYPE)
|
|
{
|
|
char *p;
|
|
/*
|
|
* Standard, external, non-debugger, symbols
|
|
*/
|
|
|
|
case N_TEXT | N_EXT:
|
|
case N_NBTEXT | N_EXT:
|
|
case N_NBDATA | N_EXT:
|
|
case N_NBBSS | N_EXT:
|
|
case N_SETV | N_EXT:
|
|
case N_ABS | N_EXT:
|
|
case N_DATA | N_EXT:
|
|
case N_BSS | N_EXT:
|
|
#ifdef DBXREAD_ONLY
|
|
|
|
CUR_SYMBOL_VALUE += addr; /* Relocate */
|
|
|
|
SET_NAMESTRING();
|
|
|
|
bss_ext_symbol:
|
|
record_minimal_symbol (namestring, CUR_SYMBOL_VALUE,
|
|
CUR_SYMBOL_TYPE, objfile); /* Always */
|
|
#endif /* DBXREAD_ONLY */
|
|
continue;
|
|
|
|
/* Standard, local, non-debugger, symbols */
|
|
|
|
case N_NBTEXT:
|
|
|
|
/* We need to be able to deal with both N_FN or N_TEXT,
|
|
because we have no way of knowing whether the sys-supplied ld
|
|
or GNU ld was used to make the executable. Sequents throw
|
|
in another wrinkle -- they renumbered N_FN. */
|
|
|
|
case N_FN:
|
|
case N_FN_SEQ:
|
|
case N_TEXT:
|
|
#ifdef DBXREAD_ONLY
|
|
CUR_SYMBOL_VALUE += addr; /* Relocate */
|
|
SET_NAMESTRING();
|
|
if ((namestring[0] == '-' && namestring[1] == 'l')
|
|
|| (namestring [(nsl = strlen (namestring)) - 1] == 'o'
|
|
&& namestring [nsl - 2] == '.'))
|
|
{
|
|
if (objfile -> ei.entry_point < CUR_SYMBOL_VALUE &&
|
|
objfile -> ei.entry_point >= last_o_file_start &&
|
|
addr == 0) /* FIXME nogood nomore */
|
|
{
|
|
objfile -> ei.entry_file_lowpc = last_o_file_start;
|
|
objfile -> ei.entry_file_highpc = CUR_SYMBOL_VALUE;
|
|
}
|
|
if (past_first_source_file && pst
|
|
/* The gould NP1 uses low values for .o and -l symbols
|
|
which are not the address. */
|
|
&& CUR_SYMBOL_VALUE > pst->textlow)
|
|
{
|
|
END_PSYMTAB (pst, psymtab_include_list, includes_used,
|
|
symnum * symbol_size, CUR_SYMBOL_VALUE,
|
|
dependency_list, dependencies_used);
|
|
pst = (struct partial_symtab *) 0;
|
|
includes_used = 0;
|
|
dependencies_used = 0;
|
|
}
|
|
else
|
|
past_first_source_file = 1;
|
|
last_o_file_start = CUR_SYMBOL_VALUE;
|
|
}
|
|
#endif /* DBXREAD_ONLY */
|
|
continue;
|
|
|
|
case N_DATA:
|
|
#ifdef DBXREAD_ONLY
|
|
CUR_SYMBOL_VALUE += addr; /* Relocate */
|
|
SET_NAMESTRING ();
|
|
/* Check for __DYNAMIC, which is used by Sun shared libraries.
|
|
Record it even if it's local, not global, so we can find it.
|
|
Same with virtual function tables, both global and static. */
|
|
if ((namestring[8] == 'C' && (strcmp ("__DYNAMIC", namestring) == 0))
|
|
|| VTBL_PREFIX_P ((namestring+HASH_OFFSET)))
|
|
{
|
|
/* Not really a function here, but... */
|
|
record_minimal_symbol (namestring, CUR_SYMBOL_VALUE,
|
|
CUR_SYMBOL_TYPE, objfile); /* Always */
|
|
}
|
|
#endif /* DBXREAD_ONLY */
|
|
continue;
|
|
|
|
case N_UNDF | N_EXT:
|
|
#ifdef DBXREAD_ONLY
|
|
if (CUR_SYMBOL_VALUE != 0) {
|
|
/* This is a "Fortran COMMON" symbol. See if the target
|
|
environment knows where it has been relocated to. */
|
|
|
|
CORE_ADDR reladdr;
|
|
|
|
SET_NAMESTRING();
|
|
if (target_lookup_symbol (namestring, &reladdr)) {
|
|
continue; /* Error in lookup; ignore symbol for now. */
|
|
}
|
|
CUR_SYMBOL_TYPE ^= (N_BSS^N_UNDF); /* Define it as a bss-symbol */
|
|
CUR_SYMBOL_VALUE = reladdr;
|
|
goto bss_ext_symbol;
|
|
}
|
|
#endif /* DBXREAD_ONLY */
|
|
continue; /* Just undefined, not COMMON */
|
|
|
|
/* Lots of symbol types we can just ignore. */
|
|
|
|
case N_UNDF:
|
|
case N_ABS:
|
|
case N_BSS:
|
|
case N_NBDATA:
|
|
case N_NBBSS:
|
|
continue;
|
|
|
|
/* Keep going . . .*/
|
|
|
|
/*
|
|
* Special symbol types for GNU
|
|
*/
|
|
case N_INDR:
|
|
case N_INDR | N_EXT:
|
|
case N_SETA:
|
|
case N_SETA | N_EXT:
|
|
case N_SETT:
|
|
case N_SETT | N_EXT:
|
|
case N_SETD:
|
|
case N_SETD | N_EXT:
|
|
case N_SETB:
|
|
case N_SETB | N_EXT:
|
|
case N_SETV:
|
|
continue;
|
|
|
|
/*
|
|
* Debugger symbols
|
|
*/
|
|
|
|
case N_SO: {
|
|
unsigned long valu = CUR_SYMBOL_VALUE;
|
|
/* Symbol number of the first symbol of this file (i.e. the N_SO
|
|
if there is just one, or the first if we have a pair). */
|
|
int first_symnum = symnum;
|
|
|
|
/* End the current partial symtab and start a new one */
|
|
|
|
SET_NAMESTRING();
|
|
|
|
valu += addr; /* Relocate */
|
|
|
|
if (pst && past_first_source_file)
|
|
{
|
|
/* Some compilers (including gcc) emit a pair of initial N_SOs.
|
|
The first one is a directory name; the second the file name.
|
|
If pst exists, is empty, and has a filename ending in '/',
|
|
we assume the previous N_SO was a directory name. */
|
|
if (pst -> objfile -> global_psymbols.next
|
|
== (pst -> objfile -> global_psymbols.list + pst->globals_offset)
|
|
&& pst -> objfile -> static_psymbols.next
|
|
== (pst -> objfile -> static_psymbols.list + pst->statics_offset)
|
|
&& pst->filename && pst->filename[0]
|
|
&& pst->filename[strlen(pst->filename)-1] == '/') {
|
|
/* Just replace the directory name with the real filename. */
|
|
pst->filename =
|
|
(char *) obstack_alloc (&pst->objfile->psymbol_obstack,
|
|
strlen (namestring) + 1);
|
|
strcpy (pst->filename, namestring);
|
|
continue;
|
|
}
|
|
END_PSYMTAB (pst, psymtab_include_list, includes_used,
|
|
first_symnum * symbol_size, valu,
|
|
dependency_list, dependencies_used);
|
|
pst = (struct partial_symtab *) 0;
|
|
includes_used = 0;
|
|
dependencies_used = 0;
|
|
}
|
|
else
|
|
past_first_source_file = 1;
|
|
|
|
pst = START_PSYMTAB (objfile, addr,
|
|
namestring, valu,
|
|
first_symnum * symbol_size,
|
|
objfile -> global_psymbols.next,
|
|
objfile -> static_psymbols.next);
|
|
continue;
|
|
}
|
|
|
|
case N_BINCL:
|
|
#ifdef DBXREAD_ONLY
|
|
/* Add this bincl to the bincl_list for future EXCLs. No
|
|
need to save the string; it'll be around until
|
|
read_dbx_symtab function returns */
|
|
|
|
SET_NAMESTRING();
|
|
|
|
add_bincl_to_list (pst, namestring, CUR_SYMBOL_VALUE);
|
|
|
|
/* Mark down an include file in the current psymtab */
|
|
|
|
psymtab_include_list[includes_used++] = namestring;
|
|
if (includes_used >= includes_allocated)
|
|
{
|
|
char **orig = psymtab_include_list;
|
|
|
|
psymtab_include_list = (char **)
|
|
alloca ((includes_allocated *= 2) *
|
|
sizeof (char *));
|
|
bcopy (orig, psymtab_include_list,
|
|
includes_used * sizeof (char *));
|
|
}
|
|
|
|
#endif /* DBXREAD_ONLY */
|
|
continue;
|
|
|
|
case N_SOL:
|
|
/* Mark down an include file in the current psymtab */
|
|
|
|
SET_NAMESTRING();
|
|
|
|
/* In C++, one may expect the same filename to come round many
|
|
times, when code is coming alternately from the main file
|
|
and from inline functions in other files. So I check to see
|
|
if this is a file we've seen before -- either the main
|
|
source file, or a previously included file.
|
|
|
|
This seems to be a lot of time to be spending on N_SOL, but
|
|
things like "break c-exp.y:435" need to work (I
|
|
suppose the psymtab_include_list could be hashed or put
|
|
in a binary tree, if profiling shows this is a major hog). */
|
|
if (pst && !strcmp (namestring, pst->filename))
|
|
continue;
|
|
{
|
|
register int i;
|
|
for (i = 0; i < includes_used; i++)
|
|
if (!strcmp (namestring, psymtab_include_list[i]))
|
|
{
|
|
i = -1;
|
|
break;
|
|
}
|
|
if (i == -1)
|
|
continue;
|
|
}
|
|
|
|
psymtab_include_list[includes_used++] = namestring;
|
|
if (includes_used >= includes_allocated)
|
|
{
|
|
char **orig = psymtab_include_list;
|
|
|
|
psymtab_include_list = (char **)
|
|
alloca ((includes_allocated *= 2) *
|
|
sizeof (char *));
|
|
bcopy (orig, psymtab_include_list,
|
|
includes_used * sizeof (char *));
|
|
}
|
|
continue;
|
|
|
|
case N_LSYM: /* Typedef or automatic variable. */
|
|
case N_STSYM: /* Data seg var -- static */
|
|
case N_LCSYM: /* BSS " */
|
|
case N_NBSTS: /* Gould nobase. */
|
|
case N_NBLCS: /* symbols. */
|
|
|
|
SET_NAMESTRING();
|
|
|
|
p = (char *) strchr (namestring, ':');
|
|
|
|
/* Skip if there is no :. */
|
|
if (!p) continue;
|
|
|
|
switch (p[1])
|
|
{
|
|
case 'T':
|
|
ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
|
|
STRUCT_NAMESPACE, LOC_TYPEDEF,
|
|
objfile->static_psymbols, CUR_SYMBOL_VALUE);
|
|
if (p[2] == 't')
|
|
{
|
|
/* Also a typedef with the same name. */
|
|
ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
|
|
VAR_NAMESPACE, LOC_TYPEDEF,
|
|
objfile->static_psymbols, CUR_SYMBOL_VALUE);
|
|
p += 1;
|
|
}
|
|
goto check_enum;
|
|
case 't':
|
|
ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
|
|
VAR_NAMESPACE, LOC_TYPEDEF,
|
|
objfile->static_psymbols, CUR_SYMBOL_VALUE);
|
|
check_enum:
|
|
/* If this is an enumerated type, we need to
|
|
add all the enum constants to the partial symbol
|
|
table. This does not cover enums without names, e.g.
|
|
"enum {a, b} c;" in C, but fortunately those are
|
|
rare. There is no way for GDB to find those from the
|
|
enum type without spending too much time on it. Thus
|
|
to solve this problem, the compiler needs to put out separate
|
|
constant symbols ('c' N_LSYMS) for enum constants in
|
|
enums without names, or put out a dummy type. */
|
|
|
|
/* We are looking for something of the form
|
|
<name> ":" ("t" | "T") [<number> "="] "e"
|
|
{<constant> ":" <value> ","} ";". */
|
|
|
|
/* Skip over the colon and the 't' or 'T'. */
|
|
p += 2;
|
|
/* This type may be given a number. Also, numbers can come
|
|
in pairs like (0,26). Skip over it. */
|
|
while ((*p >= '0' && *p <= '9')
|
|
|| *p == '(' || *p == ',' || *p == ')'
|
|
|| *p == '=')
|
|
p++;
|
|
|
|
if (*p++ == 'e')
|
|
{
|
|
/* We have found an enumerated type. */
|
|
/* According to comments in read_enum_type
|
|
a comma could end it instead of a semicolon.
|
|
I don't know where that happens.
|
|
Accept either. */
|
|
while (*p && *p != ';' && *p != ',')
|
|
{
|
|
char *q;
|
|
|
|
/* Check for and handle cretinous dbx symbol name
|
|
continuation! */
|
|
if (*p == '\\')
|
|
p = next_symbol_text ();
|
|
|
|
/* Point to the character after the name
|
|
of the enum constant. */
|
|
for (q = p; *q && *q != ':'; q++)
|
|
;
|
|
/* Note that the value doesn't matter for
|
|
enum constants in psymtabs, just in symtabs. */
|
|
ADD_PSYMBOL_TO_LIST (p, q - p,
|
|
VAR_NAMESPACE, LOC_CONST,
|
|
objfile->static_psymbols, 0);
|
|
/* Point past the name. */
|
|
p = q;
|
|
/* Skip over the value. */
|
|
while (*p && *p != ',')
|
|
p++;
|
|
/* Advance past the comma. */
|
|
if (*p)
|
|
p++;
|
|
}
|
|
}
|
|
continue;
|
|
case 'c':
|
|
/* Constant, e.g. from "const" in Pascal. */
|
|
ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
|
|
VAR_NAMESPACE, LOC_CONST,
|
|
objfile->static_psymbols, CUR_SYMBOL_VALUE);
|
|
continue;
|
|
default:
|
|
/* Skip if the thing following the : is
|
|
not a letter (which indicates declaration of a local
|
|
variable, which we aren't interested in). */
|
|
continue;
|
|
}
|
|
|
|
case N_FUN:
|
|
case N_GSYM: /* Global (extern) variable; can be
|
|
data or bss (sigh). */
|
|
|
|
/* Following may probably be ignored; I'll leave them here
|
|
for now (until I do Pascal and Modula 2 extensions). */
|
|
|
|
case N_PC: /* I may or may not need this; I
|
|
suspect not. */
|
|
case N_M2C: /* I suspect that I can ignore this here. */
|
|
case N_SCOPE: /* Same. */
|
|
|
|
SET_NAMESTRING();
|
|
|
|
p = (char *) strchr (namestring, ':');
|
|
if (!p)
|
|
continue; /* Not a debugging symbol. */
|
|
|
|
|
|
|
|
/* Main processing section for debugging symbols which
|
|
the initial read through the symbol tables needs to worry
|
|
about. If we reach this point, the symbol which we are
|
|
considering is definitely one we are interested in.
|
|
p must also contain the (valid) index into the namestring
|
|
which indicates the debugging type symbol. */
|
|
|
|
switch (p[1])
|
|
{
|
|
case 'c':
|
|
ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
|
|
VAR_NAMESPACE, LOC_CONST,
|
|
objfile->static_psymbols, CUR_SYMBOL_VALUE);
|
|
continue;
|
|
case 'S':
|
|
CUR_SYMBOL_VALUE += addr; /* Relocate */
|
|
ADD_PSYMBOL_ADDR_TO_LIST (namestring, p - namestring,
|
|
VAR_NAMESPACE, LOC_STATIC,
|
|
objfile->static_psymbols, CUR_SYMBOL_VALUE);
|
|
continue;
|
|
case 'G':
|
|
CUR_SYMBOL_VALUE += addr; /* Relocate */
|
|
/* The addresses in these entries are reported to be
|
|
wrong. See the code that reads 'G's for symtabs. */
|
|
ADD_PSYMBOL_ADDR_TO_LIST (namestring, p - namestring,
|
|
VAR_NAMESPACE, LOC_STATIC,
|
|
objfile->global_psymbols, CUR_SYMBOL_VALUE);
|
|
continue;
|
|
|
|
case 't':
|
|
ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
|
|
VAR_NAMESPACE, LOC_TYPEDEF,
|
|
objfile->static_psymbols, CUR_SYMBOL_VALUE);
|
|
continue;
|
|
|
|
case 'f':
|
|
ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
|
|
VAR_NAMESPACE, LOC_BLOCK,
|
|
objfile->static_psymbols, CUR_SYMBOL_VALUE);
|
|
continue;
|
|
|
|
/* Global functions were ignored here, but now they
|
|
are put into the global psymtab like one would expect.
|
|
They're also in the misc fn vector...
|
|
FIXME, why did it used to ignore these? That broke
|
|
"i fun" on these functions. */
|
|
case 'F':
|
|
ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
|
|
VAR_NAMESPACE, LOC_BLOCK,
|
|
objfile->global_psymbols, CUR_SYMBOL_VALUE);
|
|
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;
|
|
|
|
default:
|
|
/* Unexpected symbol. Ignore it; perhaps it is an extension
|
|
that we don't know about.
|
|
|
|
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;
|
|
}
|
|
|
|
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 *));
|
|
bcopy (orig, dependency_list,
|
|
(dependencies_used
|
|
* sizeof (struct partial_symtab *)));
|
|
#ifdef DEBUG_INFO
|
|
fprintf (stderr, "Had to reallocate dependency list.\n");
|
|
fprintf (stderr, "New dependencies allocated: %d\n",
|
|
dependencies_allocated);
|
|
#endif
|
|
}
|
|
}
|
|
else
|
|
error ("Invalid symbol data: \"repeated\" header file not previously seen, at symtab pos %d.",
|
|
symnum);
|
|
}
|
|
#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 */
|
|
/* 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;
|
|
}
|