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Oodles of changes. The most important is adding support for stabs

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encapsulated in mips ecoff.  See ChangeLog for the gory details.
This commit is contained in:
Per Bothner
1991-12-23 23:16:58 +00:00
parent 3e60a6b1d3
commit 7e258d18e0
18 changed files with 1645 additions and 1499 deletions
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576
gdb/partial-stab.h Normal file
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@@ -0,0 +1,576 @@
/* 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.
*/
#ifdef DEBUG
/* Since one arg is a struct, we have to pass in a ptr and deref it (sigh) */
#define ADD_PSYMBOL_TO_LIST(NAME, NAMELENGTH, NAMESPACE, CLASS, LIST, VALUE) \
add_psymbol_to_plist(NAME, NAMELENGTH, NAMESPACE, CLASS, &LIST, VALUE)
#define ADD_PSYMBOL_ADDR_TO_LIST(NAME, NAMELENGTH, NAMESPACE, CLASS, LIST, VALUE) \
add_psymbol_to_plist(NAME, NAMELENGTH, NAMESPACE, CLASS, &LIST, VALUE)
#else
/* Add a symbol with an integer value to a psymtab. */
#define ADD_PSYMBOL_TO_LIST(NAME, NAMELENGTH, NAMESPACE, CLASS, LIST, VALUE) \
ADD_PSYMBOL_VT_TO_LIST(NAME, NAMELENGTH, NAMESPACE, CLASS, LIST, VALUE, SYMBOL_VALUE)
/* Add a symbol with a CORE_ADDR value to a psymtab. */
#define ADD_PSYMBOL_ADDR_TO_LIST(NAME,NAMELENGTH, NAMESPACE,CLASS, LIST,VALUE)\
ADD_PSYMBOL_VT_TO_LIST(NAME, NAMELENGTH, NAMESPACE, CLASS, LIST, VALUE, SYMBOL_VALUE_ADDRESS)
#endif
/* End of macro definitions, now let's handle them symbols! */
switch (CUR_SYMBOL_TYPE)
{
char *p;
/*
* Standard, external, non-debugger, symbols
*/
#ifdef DBXREAD_ONLY
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:
CUR_SYMBOL_VALUE += addr; /* Relocate */
SET_NAMESTRING();
bss_ext_symbol:
record_misc_function (namestring, CUR_SYMBOL_VALUE,
CUR_SYMBOL_TYPE); /* Always */
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:
CUR_SYMBOL_VALUE += addr; /* Relocate */
SET_NAMESTRING();
if ((namestring[0] == '-' && namestring[1] == 'l')
|| (namestring [(nsl = strlen (namestring)) - 1] == 'o'
&& namestring [nsl - 2] == '.'))
{
if (entry_point < CUR_SYMBOL_VALUE
&& entry_point >= last_o_file_start
&& addr == 0) /* FIXME nogood nomore */
{
startup_file_start = last_o_file_start;
startup_file_end = 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;
}
continue;
case N_DATA:
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_misc_function (namestring, CUR_SYMBOL_VALUE,
CUR_SYMBOL_TYPE); /* Always */
}
continue;
case N_UNDF | N_EXT:
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;
}
continue; /* Just undefined, not COMMON */
#endif
/* 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();
/* Peek at the next symbol. If it is also an N_SO, the
first one just indicates the directory. */
CHECK_SECOND_N_SO();
valu += addr; /* Relocate */
if (pst && past_first_source_file)
{
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,
global_psymbols.next, static_psymbols.next);
continue;
}
#ifdef DBXREAD_ONLY
case N_BINCL:
/* 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 *));
}
continue;
#endif
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,
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,
static_psymbols, CUR_SYMBOL_VALUE);
p += 1;
}
goto check_enum;
case 't':
ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
VAR_NAMESPACE, LOC_TYPEDEF,
static_psymbols, CUR_SYMBOL_VALUE);
check_enum:
#ifdef DBXREAD_ONLY
/* 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,
static_psymbols, 0);
/* Point past the name. */
p = q;
/* Skip over the value. */
while (*p && *p != ',')
p++;
/* Advance past the comma. */
if (*p)
p++;
}
}
#endif
continue;
case 'c':
/* Constant, e.g. from "const" in Pascal. */
ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
VAR_NAMESPACE, LOC_CONST,
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,
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,
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,
global_psymbols, CUR_SYMBOL_VALUE);
continue;
case 't':
ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
VAR_NAMESPACE, LOC_TYPEDEF,
static_psymbols, CUR_SYMBOL_VALUE);
continue;
case 'f':
ADD_PSYMBOL_TO_LIST (namestring, p - namestring,
VAR_NAMESPACE, LOC_BLOCK,
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,
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;
}
#ifdef DBXREAD_ONLY
case N_EXCL:
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);
}
continue;
#endif
case N_RBRAC:
#ifdef HANDLE_RBRAC
HANDLE_RBRAC(CUR_SYMBOL_VALUE);
#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:
#ifdef DBXREAD_ONLY
/* 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));
#endif
continue;
}