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mdebugread.c
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/* Read a symbol table in ECOFF format (Third-Eye).
Copyright (C) 1986-2015 Free Software Foundation, Inc.
Original version contributed by Alessandro Forin ([email protected]) at
CMU. Major work by Per Bothner, John Gilmore and Ian Lance Taylor
at Cygnus Support.
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 3 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, see <http://www.gnu.org/licenses/>. */
/* This module provides the function mdebug_build_psymtabs. It reads
ECOFF debugging information into partial symbol tables. The
debugging information is read from two structures. A struct
ecoff_debug_swap includes the sizes of each ECOFF structure and
swapping routines; these are fixed for a particular target. A
struct ecoff_debug_info points to the debugging information for a
particular object file.
ECOFF symbol tables are mostly written in the byte order of the
target machine. However, one section of the table (the auxiliary
symbol information) is written in the host byte order. There is a
bit in the other symbol info which describes which host byte order
was used. ECOFF thereby takes the trophy from Intel `b.out' for
the most brain-dead adaptation of a file format to byte order.
This module can read all four of the known byte-order combinations,
on any type of host. */
#include "defs.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "gdbcore.h"
#include "filenames.h"
#include "objfiles.h"
#include "gdb_obstack.h"
#include "buildsym.h"
#include "stabsread.h"
#include "complaints.h"
#include "demangle.h"
#include "gdb-demangle.h"
#include "block.h"
#include "dictionary.h"
#include "mdebugread.h"
#include <sys/stat.h>
#include "psympriv.h"
#include "source.h"
#include "bfd.h"
#include "coff/ecoff.h" /* COFF-like aspects of ecoff files. */
#include "libaout.h" /* Private BFD a.out information. */
#include "aout/aout64.h"
#include "aout/stab_gnu.h" /* STABS information. */
#include "expression.h"
extern void _initialize_mdebugread (void);
/* Provide a way to test if we have both ECOFF and ELF symbol tables.
We use this define in order to know whether we should override a
symbol's ECOFF section with its ELF section. This is necessary in
case the symbol's ELF section could not be represented in ECOFF. */
#define ECOFF_IN_ELF(bfd) (bfd_get_flavour (bfd) == bfd_target_elf_flavour \
&& bfd_get_section_by_name (bfd, ".mdebug") != NULL)
/* The objfile we are currently reading. */
static struct objfile *mdebugread_objfile;
/* We put a pointer to this structure in the read_symtab_private field
of the psymtab. */
struct symloc
{
/* Index of the FDR that this psymtab represents. */
int fdr_idx;
/* The BFD that the psymtab was created from. */
bfd *cur_bfd;
const struct ecoff_debug_swap *debug_swap;
struct ecoff_debug_info *debug_info;
struct mdebug_pending **pending_list;
/* Pointer to external symbols for this file. */
EXTR *extern_tab;
/* Size of extern_tab. */
int extern_count;
enum language pst_language;
};
#define PST_PRIVATE(p) ((struct symloc *)(p)->read_symtab_private)
#define FDR_IDX(p) (PST_PRIVATE(p)->fdr_idx)
#define CUR_BFD(p) (PST_PRIVATE(p)->cur_bfd)
#define DEBUG_SWAP(p) (PST_PRIVATE(p)->debug_swap)
#define DEBUG_INFO(p) (PST_PRIVATE(p)->debug_info)
#define PENDING_LIST(p) (PST_PRIVATE(p)->pending_list)
#define SC_IS_TEXT(sc) ((sc) == scText \
|| (sc) == scRConst \
|| (sc) == scInit \
|| (sc) == scFini)
#define SC_IS_DATA(sc) ((sc) == scData \
|| (sc) == scSData \
|| (sc) == scRData \
|| (sc) == scPData \
|| (sc) == scXData)
#define SC_IS_COMMON(sc) ((sc) == scCommon || (sc) == scSCommon)
#define SC_IS_BSS(sc) ((sc) == scBss)
#define SC_IS_SBSS(sc) ((sc) == scSBss)
#define SC_IS_UNDEF(sc) ((sc) == scUndefined || (sc) == scSUndefined)
/* Various complaints about symbol reading that don't abort the process. */
static void
index_complaint (const char *arg1)
{
complaint (&symfile_complaints, _("bad aux index at symbol %s"), arg1);
}
static void
unknown_ext_complaint (const char *arg1)
{
complaint (&symfile_complaints, _("unknown external symbol %s"), arg1);
}
static void
basic_type_complaint (int arg1, const char *arg2)
{
complaint (&symfile_complaints, _("cannot map ECOFF basic type 0x%x for %s"),
arg1, arg2);
}
static void
bad_tag_guess_complaint (const char *arg1)
{
complaint (&symfile_complaints,
_("guessed tag type of %s incorrectly"), arg1);
}
static void
bad_rfd_entry_complaint (const char *arg1, int arg2, int arg3)
{
complaint (&symfile_complaints, _("bad rfd entry for %s: file %d, index %d"),
arg1, arg2, arg3);
}
static void
unexpected_type_code_complaint (const char *arg1)
{
complaint (&symfile_complaints, _("unexpected type code for %s"), arg1);
}
/* Macros and extra defs. */
/* Puns: hard to find whether -g was used and how. */
#define MIN_GLEVEL GLEVEL_0
#define compare_glevel(a,b) \
(((a) == GLEVEL_3) ? ((b) < GLEVEL_3) : \
((b) == GLEVEL_3) ? -1 : (int)((b) - (a)))
/* Things that really are local to this module. */
/* Remember what we deduced to be the source language of this psymtab. */
static enum language psymtab_language = language_unknown;
/* Current BFD. */
static bfd *cur_bfd;
/* How to parse debugging information for CUR_BFD. */
static const struct ecoff_debug_swap *debug_swap;
/* Pointers to debugging information for CUR_BFD. */
static struct ecoff_debug_info *debug_info;
/* Pointer to current file decriptor record, and its index. */
static FDR *cur_fdr;
static int cur_fd;
/* Index of current symbol. */
static int cur_sdx;
/* Note how much "debuggable" this image is. We would like
to see at least one FDR with full symbols. */
static int max_gdbinfo;
static int max_glevel;
/* When examining .o files, report on undefined symbols. */
static int n_undef_symbols, n_undef_labels, n_undef_vars, n_undef_procs;
/* Pseudo symbol to use when putting stabs into the symbol table. */
static char stabs_symbol[] = STABS_SYMBOL;
/* Nonzero if we have seen ecoff debugging info for a file. */
static int found_ecoff_debugging_info;
/* Forward declarations. */
static int upgrade_type (int, struct type **, int, union aux_ext *,
int, char *);
static void parse_partial_symbols (struct objfile *);
static int has_opaque_xref (FDR *, SYMR *);
static int cross_ref (int, union aux_ext *, struct type **, enum type_code,
char **, int, char *);
static struct symbol *new_symbol (char *);
static struct type *new_type (char *);
enum block_type { FUNCTION_BLOCK, NON_FUNCTION_BLOCK };
static struct block *new_block (enum block_type);
static struct compunit_symtab *new_symtab (const char *, int, struct objfile *);
static struct linetable *new_linetable (int);
static struct blockvector *new_bvect (int);
static struct type *parse_type (int, union aux_ext *, unsigned int, int *,
int, char *);
static struct symbol *mylookup_symbol (char *, const struct block *,
domain_enum, enum address_class);
static void sort_blocks (struct symtab *);
static struct partial_symtab *new_psymtab (char *, struct objfile *);
static void psymtab_to_symtab_1 (struct objfile *objfile,
struct partial_symtab *, const char *);
static void add_block (struct block *, struct symtab *);
static void add_symbol (struct symbol *, struct symtab *, struct block *);
static int add_line (struct linetable *, int, CORE_ADDR, int);
static struct linetable *shrink_linetable (struct linetable *);
static void handle_psymbol_enumerators (struct objfile *, FDR *, int,
CORE_ADDR);
static char *mdebug_next_symbol_text (struct objfile *);
/* Exported procedure: Builds a symtab from the partial symtab SELF.
Restores the environment in effect when SELF was created, delegates
most of the work to an ancillary procedure, and sorts
and reorders the symtab list at the end. SELF is not NULL. */
static void
mdebug_read_symtab (struct partial_symtab *self, struct objfile *objfile)
{
if (info_verbose)
{
printf_filtered (_("Reading in symbols for %s..."), self->filename);
gdb_flush (gdb_stdout);
}
next_symbol_text_func = mdebug_next_symbol_text;
psymtab_to_symtab_1 (objfile, self, self->filename);
/* Match with global symbols. This only needs to be done once,
after all of the symtabs and dependencies have been read in. */
scan_file_globals (objfile);
if (info_verbose)
printf_filtered (_("done.\n"));
}
/* File-level interface functions. */
/* Find a file descriptor given its index RF relative to a file CF. */
static FDR *
get_rfd (int cf, int rf)
{
FDR *fdrs;
FDR *f;
RFDT rfd;
fdrs = debug_info->fdr;
f = fdrs + cf;
/* Object files do not have the RFD table, all refs are absolute. */
if (f->rfdBase == 0)
return fdrs + rf;
(*debug_swap->swap_rfd_in) (cur_bfd,
((char *) debug_info->external_rfd
+ ((f->rfdBase + rf)
* debug_swap->external_rfd_size)),
&rfd);
return fdrs + rfd;
}
/* Return a safer print NAME for a file descriptor. */
static char *
fdr_name (FDR *f)
{
if (f->rss == -1)
return "<stripped file>";
if (f->rss == 0)
return "<NFY>";
return debug_info->ss + f->issBase + f->rss;
}
/* Read in and parse the symtab of the file OBJFILE. Symbols from
different sections are relocated via the SECTION_OFFSETS. */
void
mdebug_build_psymtabs (struct objfile *objfile,
const struct ecoff_debug_swap *swap,
struct ecoff_debug_info *info)
{
cur_bfd = objfile->obfd;
debug_swap = swap;
debug_info = info;
stabsread_new_init ();
buildsym_new_init ();
free_header_files ();
init_header_files ();
/* Make sure all the FDR information is swapped in. */
if (info->fdr == (FDR *) NULL)
{
char *fdr_src;
char *fdr_end;
FDR *fdr_ptr;
info->fdr = (FDR *) obstack_alloc (&objfile->objfile_obstack,
(info->symbolic_header.ifdMax
* sizeof (FDR)));
fdr_src = info->external_fdr;
fdr_end = (fdr_src
+ info->symbolic_header.ifdMax * swap->external_fdr_size);
fdr_ptr = info->fdr;
for (; fdr_src < fdr_end; fdr_src += swap->external_fdr_size, fdr_ptr++)
(*swap->swap_fdr_in) (objfile->obfd, fdr_src, fdr_ptr);
}
parse_partial_symbols (objfile);
#if 0
/* Check to make sure file was compiled with -g. If not, warn the
user of this limitation. */
if (compare_glevel (max_glevel, GLEVEL_2) < 0)
{
if (max_gdbinfo == 0)
printf_unfiltered (_("\n%s not compiled with -g, "
"debugging support is limited.\n"),
objfile->name);
printf_unfiltered (_("You should compile with -g2 or "
"-g3 for best debugging support.\n"));
gdb_flush (gdb_stdout);
}
#endif
}
/* Local utilities */
/* Map of FDR indexes to partial symtabs. */
struct pst_map
{
struct partial_symtab *pst; /* the psymtab proper */
long n_globals; /* exported globals (external symbols) */
long globals_offset; /* cumulative */
};
/* Utility stack, used to nest procedures and blocks properly.
It is a doubly linked list, to avoid too many alloc/free.
Since we might need it quite a few times it is NOT deallocated
after use. */
static struct parse_stack
{
struct parse_stack *next, *prev;
struct symtab *cur_st; /* Current symtab. */
struct block *cur_block; /* Block in it. */
/* What are we parsing. stFile, or stBlock are for files and
blocks. stProc or stStaticProc means we have seen the start of a
procedure, but not the start of the block within in. When we see
the start of that block, we change it to stNil, without pushing a
new block, i.e. stNil means both a procedure and a block. */
int blocktype;
struct type *cur_type; /* Type we parse fields for. */
int cur_field; /* Field number in cur_type. */
CORE_ADDR procadr; /* Start addres of this procedure. */
int numargs; /* Its argument count. */
}
*top_stack; /* Top stack ptr */
/* Enter a new lexical context. */
static void
push_parse_stack (void)
{
struct parse_stack *newobj;
/* Reuse frames if possible. */
if (top_stack && top_stack->prev)
newobj = top_stack->prev;
else
newobj = XCNEW (struct parse_stack);
/* Initialize new frame with previous content. */
if (top_stack)
{
struct parse_stack *prev = newobj->prev;
*newobj = *top_stack;
top_stack->prev = newobj;
newobj->prev = prev;
newobj->next = top_stack;
}
top_stack = newobj;
}
/* Exit a lexical context. */
static void
pop_parse_stack (void)
{
if (!top_stack)
return;
if (top_stack->next)
top_stack = top_stack->next;
}
/* Cross-references might be to things we haven't looked at
yet, e.g. type references. To avoid too many type
duplications we keep a quick fixup table, an array
of lists of references indexed by file descriptor. */
struct mdebug_pending
{
struct mdebug_pending *next; /* link */
char *s; /* the unswapped symbol */
struct type *t; /* its partial type descriptor */
};
/* The pending information is kept for an entire object file. We
allocate the pending information table when we create the partial
symbols, and we store a pointer to the single table in each
psymtab. */
static struct mdebug_pending **pending_list;
/* Check whether we already saw symbol SH in file FH. */
static struct mdebug_pending *
is_pending_symbol (FDR *fh, char *sh)
{
int f_idx = fh - debug_info->fdr;
struct mdebug_pending *p;
/* Linear search is ok, list is typically no more than 10 deep. */
for (p = pending_list[f_idx]; p; p = p->next)
if (p->s == sh)
break;
return p;
}
/* Add a new symbol SH of type T. */
static void
add_pending (FDR *fh, char *sh, struct type *t)
{
int f_idx = fh - debug_info->fdr;
struct mdebug_pending *p = is_pending_symbol (fh, sh);
/* Make sure we do not make duplicates. */
if (!p)
{
p = ((struct mdebug_pending *)
obstack_alloc (&mdebugread_objfile->objfile_obstack,
sizeof (struct mdebug_pending)));
p->s = sh;
p->t = t;
p->next = pending_list[f_idx];
pending_list[f_idx] = p;
}
}
/* Parsing Routines proper. */
/* Parse a single symbol. Mostly just make up a GDB symbol for it.
For blocks, procedures and types we open a new lexical context.
This is basically just a big switch on the symbol's type. Argument
AX is the base pointer of aux symbols for this file (fh->iauxBase).
EXT_SH points to the unswapped symbol, which is needed for struct,
union, etc., types; it is NULL for an EXTR. BIGEND says whether
aux symbols are big-endian or little-endian. Return count of
SYMR's handled (normally one). */
static int
mdebug_reg_to_regnum (struct symbol *sym, struct gdbarch *gdbarch)
{
return gdbarch_ecoff_reg_to_regnum (gdbarch, SYMBOL_VALUE (sym));
}
static const struct symbol_register_ops mdebug_register_funcs = {
mdebug_reg_to_regnum
};
/* The "aclass" indices for computed symbols. */
static int mdebug_register_index;
static int mdebug_regparm_index;
static int
parse_symbol (SYMR *sh, union aux_ext *ax, char *ext_sh, int bigend,
struct section_offsets *section_offsets, struct objfile *objfile)
{
struct gdbarch *gdbarch = get_objfile_arch (objfile);
const bfd_size_type external_sym_size = debug_swap->external_sym_size;
void (*const swap_sym_in) (bfd *, void *, SYMR *) = debug_swap->swap_sym_in;
char *name;
struct symbol *s;
struct block *b;
struct mdebug_pending *pend;
struct type *t;
struct field *f;
int count = 1;
enum address_class theclass;
TIR tir;
long svalue = sh->value;
int bitsize;
if (ext_sh == (char *) NULL)
name = debug_info->ssext + sh->iss;
else
name = debug_info->ss + cur_fdr->issBase + sh->iss;
switch (sh->sc)
{
case scText:
case scRConst:
/* Do not relocate relative values.
The value of a stEnd symbol is the displacement from the
corresponding start symbol value.
The value of a stBlock symbol is the displacement from the
procedure address. */
if (sh->st != stEnd && sh->st != stBlock)
sh->value += ANOFFSET (section_offsets, SECT_OFF_TEXT (objfile));
break;
case scData:
case scSData:
case scRData:
case scPData:
case scXData:
sh->value += ANOFFSET (section_offsets, SECT_OFF_DATA (objfile));
break;
case scBss:
case scSBss:
sh->value += ANOFFSET (section_offsets, SECT_OFF_BSS (objfile));
break;
}
switch (sh->st)
{
case stNil:
break;
case stGlobal: /* External symbol, goes into global block. */
theclass = LOC_STATIC;
b = BLOCKVECTOR_BLOCK (SYMTAB_BLOCKVECTOR (top_stack->cur_st),
GLOBAL_BLOCK);
s = new_symbol (name);
SYMBOL_VALUE_ADDRESS (s) = (CORE_ADDR) sh->value;
goto data;
case stStatic: /* Static data, goes into current block. */
theclass = LOC_STATIC;
b = top_stack->cur_block;
s = new_symbol (name);
if (SC_IS_COMMON (sh->sc))
{
/* It is a FORTRAN common block. At least for SGI Fortran the
address is not in the symbol; we need to fix it later in
scan_file_globals. */
int bucket = hashname (SYMBOL_LINKAGE_NAME (s));
SYMBOL_VALUE_CHAIN (s) = global_sym_chain[bucket];
global_sym_chain[bucket] = s;
}
else
SYMBOL_VALUE_ADDRESS (s) = (CORE_ADDR) sh->value;
goto data;
case stLocal: /* Local variable, goes into current block. */
b = top_stack->cur_block;
s = new_symbol (name);
SYMBOL_VALUE (s) = svalue;
if (sh->sc == scRegister)
theclass = mdebug_register_index;
else
theclass = LOC_LOCAL;
data: /* Common code for symbols describing data. */
SYMBOL_DOMAIN (s) = VAR_DOMAIN;
SYMBOL_ACLASS_INDEX (s) = theclass;
add_symbol (s, top_stack->cur_st, b);
/* Type could be missing if file is compiled without debugging info. */
if (SC_IS_UNDEF (sh->sc)
|| sh->sc == scNil || sh->index == indexNil)
SYMBOL_TYPE (s) = objfile_type (objfile)->nodebug_data_symbol;
else
SYMBOL_TYPE (s) = parse_type (cur_fd, ax, sh->index, 0, bigend, name);
/* Value of a data symbol is its memory address. */
break;
case stParam: /* Arg to procedure, goes into current
block. */
max_gdbinfo++;
found_ecoff_debugging_info = 1;
top_stack->numargs++;
/* Special GNU C++ name. */
if (is_cplus_marker (name[0]) && name[1] == 't' && name[2] == 0)
name = "this"; /* FIXME, not alloc'd in obstack. */
s = new_symbol (name);
SYMBOL_DOMAIN (s) = VAR_DOMAIN;
SYMBOL_IS_ARGUMENT (s) = 1;
switch (sh->sc)
{
case scRegister:
/* Pass by value in register. */
SYMBOL_ACLASS_INDEX (s) = mdebug_register_index;
break;
case scVar:
/* Pass by reference on stack. */
SYMBOL_ACLASS_INDEX (s) = LOC_REF_ARG;
break;
case scVarRegister:
/* Pass by reference in register. */
SYMBOL_ACLASS_INDEX (s) = mdebug_regparm_index;
break;
default:
/* Pass by value on stack. */
SYMBOL_ACLASS_INDEX (s) = LOC_ARG;
break;
}
SYMBOL_VALUE (s) = svalue;
SYMBOL_TYPE (s) = parse_type (cur_fd, ax, sh->index, 0, bigend, name);
add_symbol (s, top_stack->cur_st, top_stack->cur_block);
break;
case stLabel: /* label, goes into current block. */
s = new_symbol (name);
SYMBOL_DOMAIN (s) = VAR_DOMAIN; /* So that it can be used */
SYMBOL_ACLASS_INDEX (s) = LOC_LABEL; /* but not misused. */
SYMBOL_VALUE_ADDRESS (s) = (CORE_ADDR) sh->value;
SYMBOL_TYPE (s) = objfile_type (objfile)->builtin_int;
add_symbol (s, top_stack->cur_st, top_stack->cur_block);
break;
case stProc: /* Procedure, usually goes into global block. */
case stStaticProc: /* Static procedure, goes into current block. */
/* For stProc symbol records, we need to check the storage class
as well, as only (stProc, scText) entries represent "real"
procedures - See the Compaq document titled "Object File /
Symbol Table Format Specification" for more information.
If the storage class is not scText, we discard the whole block
of symbol records for this stProc. */
if (sh->st == stProc && sh->sc != scText)
{
char *ext_tsym = ext_sh;
int keep_counting = 1;
SYMR tsym;
while (keep_counting)
{
ext_tsym += external_sym_size;
(*swap_sym_in) (cur_bfd, ext_tsym, &tsym);
count++;
switch (tsym.st)
{
case stParam:
break;
case stEnd:
keep_counting = 0;
break;
default:
complaint (&symfile_complaints,
_("unknown symbol type 0x%x"), sh->st);
break;
}
}
break;
}
s = new_symbol (name);
SYMBOL_DOMAIN (s) = VAR_DOMAIN;
SYMBOL_ACLASS_INDEX (s) = LOC_BLOCK;
/* Type of the return value. */
if (SC_IS_UNDEF (sh->sc) || sh->sc == scNil)
t = objfile_type (objfile)->builtin_int;
else
{
t = parse_type (cur_fd, ax, sh->index + 1, 0, bigend, name);
if (strcmp (name, "malloc") == 0
&& TYPE_CODE (t) == TYPE_CODE_VOID)
{
/* I don't know why, but, at least under Alpha GNU/Linux,
when linking against a malloc without debugging
symbols, its read as a function returning void---this
is bad because it means we cannot call functions with
string arguments interactively; i.e., "call
printf("howdy\n")" would fail with the error message
"program has no memory available". To avoid this, we
patch up the type and make it void*
instead. ([email protected]). */
t = make_pointer_type (t, NULL);
}
}
b = top_stack->cur_block;
if (sh->st == stProc)
{
const struct blockvector *bv
= SYMTAB_BLOCKVECTOR (top_stack->cur_st);
/* The next test should normally be true, but provides a
hook for nested functions (which we don't want to make
global). */
if (b == BLOCKVECTOR_BLOCK (bv, STATIC_BLOCK))
b = BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK);
/* Irix 5 sometimes has duplicate names for the same
function. We want to add such names up at the global
level, not as a nested function. */
else if (sh->value == top_stack->procadr)
b = BLOCKVECTOR_BLOCK (bv, GLOBAL_BLOCK);
}
add_symbol (s, top_stack->cur_st, b);
/* Make a type for the procedure itself. */
SYMBOL_TYPE (s) = lookup_function_type (t);
/* All functions in C++ have prototypes. For C we don't have enough
information in the debug info. */
if (SYMBOL_LANGUAGE (s) == language_cplus)
TYPE_PROTOTYPED (SYMBOL_TYPE (s)) = 1;
/* Create and enter a new lexical context. */
b = new_block (FUNCTION_BLOCK);
SYMBOL_BLOCK_VALUE (s) = b;
BLOCK_FUNCTION (b) = s;
BLOCK_START (b) = BLOCK_END (b) = sh->value;
BLOCK_SUPERBLOCK (b) = top_stack->cur_block;
add_block (b, top_stack->cur_st);
/* Not if we only have partial info. */
if (SC_IS_UNDEF (sh->sc) || sh->sc == scNil)
break;
push_parse_stack ();
top_stack->cur_block = b;
top_stack->blocktype = sh->st;
top_stack->cur_type = SYMBOL_TYPE (s);
top_stack->cur_field = -1;
top_stack->procadr = sh->value;
top_stack->numargs = 0;
break;
/* Beginning of code for structure, union, and enum definitions.
They all share a common set of local variables, defined here. */
{
enum type_code type_code;
char *ext_tsym;
int nfields;
long max_value;
struct field *f;
case stStruct: /* Start a block defining a struct type. */
type_code = TYPE_CODE_STRUCT;
goto structured_common;
case stUnion: /* Start a block defining a union type. */
type_code = TYPE_CODE_UNION;
goto structured_common;
case stEnum: /* Start a block defining an enum type. */
type_code = TYPE_CODE_ENUM;
goto structured_common;
case stBlock: /* Either a lexical block, or some type. */
if (sh->sc != scInfo && !SC_IS_COMMON (sh->sc))
goto case_stBlock_code; /* Lexical block */
type_code = TYPE_CODE_UNDEF; /* We have a type. */
/* Common code for handling struct, union, enum, and/or as-yet-
unknown-type blocks of info about structured data. `type_code'
has been set to the proper TYPE_CODE, if we know it. */
structured_common:
found_ecoff_debugging_info = 1;
push_parse_stack ();
top_stack->blocktype = stBlock;
/* First count the number of fields and the highest value. */
nfields = 0;
max_value = 0;
for (ext_tsym = ext_sh + external_sym_size;
;
ext_tsym += external_sym_size)
{
SYMR tsym;
(*swap_sym_in) (cur_bfd, ext_tsym, &tsym);
switch (tsym.st)
{
case stEnd:
/* C++ encodes class types as structures where there the
methods are encoded as stProc. The scope of stProc
symbols also ends with stEnd, thus creating a risk of
taking the wrong stEnd symbol record as the end of
the current struct, which would cause GDB to undercount
the real number of fields in this struct. To make sure
we really reached the right stEnd symbol record, we
check the associated name, and match it against the
struct name. Since method names are mangled while
the class name is not, there is no risk of having a
method whose name is identical to the class name
(in particular constructor method names are different
from the class name). There is therefore no risk that
this check stops the count on the StEnd of a method.
Also, assume that we're really at the end when tsym.iss
is 0 (issNull). */
if (tsym.iss == issNull
|| strcmp (debug_info->ss + cur_fdr->issBase + tsym.iss,
name) == 0)
goto end_of_fields;
break;
case stMember:
if (nfields == 0 && type_code == TYPE_CODE_UNDEF)
{
/* If the type of the member is Nil (or Void),
without qualifiers, assume the tag is an
enumeration.
Alpha cc -migrate enums are recognized by a zero
index and a zero symbol value.
DU 4.0 cc enums are recognized by a member type of
btEnum without qualifiers and a zero symbol value. */
if (tsym.index == indexNil
|| (tsym.index == 0 && sh->value == 0))
type_code = TYPE_CODE_ENUM;
else
{
(*debug_swap->swap_tir_in) (bigend,
&ax[tsym.index].a_ti,
&tir);
if ((tir.bt == btNil || tir.bt == btVoid
|| (tir.bt == btEnum && sh->value == 0))
&& tir.tq0 == tqNil)
type_code = TYPE_CODE_ENUM;
}
}
nfields++;
if (tsym.value > max_value)
max_value = tsym.value;
break;
case stBlock:
case stUnion:
case stEnum:
case stStruct:
{
#if 0
/* This is a no-op; is it trying to tell us something
we should be checking? */
if (tsym.sc == scVariant); /*UNIMPLEMENTED */
#endif
if (tsym.index != 0)
{
/* This is something like a struct within a
struct. Skip over the fields of the inner
struct. The -1 is because the for loop will
increment ext_tsym. */
ext_tsym = ((char *) debug_info->external_sym
+ ((cur_fdr->isymBase + tsym.index - 1)
* external_sym_size));
}
}
break;
case stTypedef:
/* mips cc puts out a typedef for struct x if it is not yet
defined when it encounters
struct y { struct x *xp; };
Just ignore it. */
break;
case stIndirect:
/* Irix5 cc puts out a stIndirect for struct x if it is not
yet defined when it encounters
struct y { struct x *xp; };
Just ignore it. */
break;
default:
complaint (&symfile_complaints,
_("declaration block contains "
"unhandled symbol type %d"),
tsym.st);
}
}
end_of_fields:
/* In an stBlock, there is no way to distinguish structs,
unions, and enums at this point. This is a bug in the
original design (that has been fixed with the recent
addition of the stStruct, stUnion, and stEnum symbol
types.) The way you can tell is if/when you see a variable
or field of that type. In that case the variable's type
(in the AUX table) says if the type is struct, union, or
enum, and points back to the stBlock here. So you can
patch the tag kind up later - but only if there actually is
a variable or field of that type.
So until we know for sure, we will guess at this point.
The heuristic is:
If the first member has index==indexNil or a void type,
assume we have an enumeration.
Otherwise, if there is more than one member, and all
the members have offset 0, assume we have a union.
Otherwise, assume we have a struct.
The heuristic could guess wrong in the case of of an
enumeration with no members or a union with one (or zero)
members, or when all except the last field of a struct have
width zero. These are uncommon and/or illegal situations,
and in any case guessing wrong probably doesn't matter
much.
But if we later do find out we were wrong, we fixup the tag
kind. Members of an enumeration must be handled
differently from struct/union fields, and that is harder to
patch up, but luckily we shouldn't need to. (If there are
any enumeration members, we can tell for sure it's an enum
here.) */
if (type_code == TYPE_CODE_UNDEF)
{
if (nfields > 1 && max_value == 0)
type_code = TYPE_CODE_UNION;
else
type_code = TYPE_CODE_STRUCT;
}
/* Create a new type or use the pending type. */
pend = is_pending_symbol (cur_fdr, ext_sh);
if (pend == (struct mdebug_pending *) NULL)
{
t = new_type (NULL);
add_pending (cur_fdr, ext_sh, t);
}
else
t = pend->t;
/* Do not set the tag name if it is a compiler generated tag name