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Virtualize "readin" and "compunit_symtab"

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This patch removes the "readin" and "compunit_symtab" members from
partial_symtab, replacing them with methods.  Then it introduces a new
"standard_psymtab" class, which restores these members; and changes
the symbol readers to use this intermediate class as the base class of
their partial symtab subclasses.

The reason for this is to make it possible for a symbol reader to
implement an alternate mapping between partial and full symbol tables.
This is important in order to be able to share psymtabs across
objfiles -- whether a psymtab has been "readin" is objfile-dependent,
as are the pointers to the full symbol tables.

gdb/ChangeLog
2020-01-26  Tom Tromey  <tom@tromey.com>

	* psymtab.c (partial_map_expand_apply)
	(psym_find_pc_sect_compunit_symtab, psym_lookup_symbol)
	(psymtab_to_symtab, psym_find_last_source_symtab, dump_psymtab)
	(psym_print_stats, psym_expand_symtabs_for_function)
	(psym_map_symbol_filenames, psym_map_matching_symbols)
	(psym_expand_symtabs_matching)
	(partial_symtab::read_dependencies, maintenance_info_psymtabs)
	(maintenance_check_psymtabs): Use new methods.
	* psympriv.h (struct partial_symtab) <readin_p,
	get_compunit_symtab>: New methods.
	<readin, compunit_symtab>: Remove members.
	(struct standard_psymtab): New.
	(struct legacy_psymtab): Derive from standard_psymtab.
	* dwarf2read.h (struct dwarf2_psymtab): Derive from
	standard_psymtab.
	* ctfread.c (struct ctf_psymtab): Derive from standard_psymtab.

Change-Id: Idb923f196d7e03bf7cb9cfc8134ed06dd3f211ce
This commit is contained in:
Tom Tromey 2019-10-23 09:50:58 -06:00
parent 0494dbecdf
commit 128a391fe4
5 changed files with 90 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
gdb/ChangeLog
View File

@ -1,3 +1,22 @@
2020-01-26 Tom Tromey <tom@tromey.com>
* psymtab.c (partial_map_expand_apply)
(psym_find_pc_sect_compunit_symtab, psym_lookup_symbol)
(psymtab_to_symtab, psym_find_last_source_symtab, dump_psymtab)
(psym_print_stats, psym_expand_symtabs_for_function)
(psym_map_symbol_filenames, psym_map_matching_symbols)
(psym_expand_symtabs_matching)
(partial_symtab::read_dependencies, maintenance_info_psymtabs)
(maintenance_check_psymtabs): Use new methods.
* psympriv.h (struct partial_symtab) <readin_p,
get_compunit_symtab>: New methods.
<readin, compunit_symtab>: Remove members.
(struct standard_psymtab): New.
(struct legacy_psymtab): Derive from standard_psymtab.
* dwarf2read.h (struct dwarf2_psymtab): Derive from
standard_psymtab.
* ctfread.c (struct ctf_psymtab): Derive from standard_psymtab.
2020-01-26 Tom Tromey <tom@tromey.com>
* xcoffread.c (xcoff_psymtab_to_symtab_1): Call

4
gdb/ctfread.c
View File

@ -116,10 +116,10 @@ struct ctf_context
};
/* A partial symtab, specialized for this module. */
struct ctf_psymtab : public partial_symtab
struct ctf_psymtab : public standard_psymtab
{
ctf_psymtab (const char *filename, struct objfile *objfile, CORE_ADDR addr)
: partial_symtab (filename, objfile, addr)
: standard_psymtab (filename, objfile, addr)
{
}

6
gdb/dwarf2read.h
View File

@ -271,16 +271,16 @@ struct dwarf2_per_objfile
dwarf2_per_objfile *get_dwarf2_per_objfile (struct objfile *objfile);
/* A partial symtab specialized for DWARF. */
struct dwarf2_psymtab : public partial_symtab
struct dwarf2_psymtab : public standard_psymtab
{
dwarf2_psymtab (const char *filename, struct objfile *objfile)
: partial_symtab (filename, objfile)
: standard_psymtab (filename, objfile)
{
}
dwarf2_psymtab (const char *filename, struct objfile *objfile,
CORE_ADDR addr)
: partial_symtab (filename, objfile, addr)
: standard_psymtab (filename, objfile, addr)
{
}

55
gdb/psympriv.h
View File

@ -137,6 +137,15 @@ struct partial_symtab
/* Ensure that all the dependencies are read in. */
void read_dependencies (struct objfile *);
/* Return true if the symtab corresponding to this psymtab has been
readin. */
virtual bool readin_p () const = 0;
/* Return a pointer to the compunit allocated for this source file.
Return nullptr if !readin or if there was no symtab. */
virtual struct compunit_symtab *get_compunit_symtab () const = 0;
/* Return the raw low text address of this partial_symtab. */
CORE_ADDR raw_text_low () const
{
@ -265,12 +274,6 @@ struct partial_symtab
int statics_offset = 0;
int n_static_syms = 0;
/* True if the symtab corresponding to this psymtab has been readin.
This is located here so that this structure packs better on
64-bit systems. */
bool readin = false;
/* True iff objfile->psymtabs_addrmap is properly populated for this
partial_symtab. For discontiguous overlapping psymtabs is the only usable
info in PSYMTABS_ADDRMAP. */
@ -289,6 +292,40 @@ struct partial_symtab
unsigned int text_low_valid : 1;
unsigned int text_high_valid : 1;
};
/* A partial symtab that tracks the "readin" and "compunit_symtab"
information in the ordinary way -- by storing it directly in this
object. */
struct standard_psymtab : public partial_symtab
{
standard_psymtab (const char *filename, struct objfile *objfile)
: partial_symtab (filename, objfile)
{
}
standard_psymtab (const char *filename, struct objfile *objfile,
CORE_ADDR addr)
: partial_symtab (filename, objfile, addr)
{
}
bool readin_p () const override
{
return readin;
}
/* Return a pointer to the compunit allocated for this source file.
Return nullptr if !readin or if there was no symtab. */
struct compunit_symtab *get_compunit_symtab () const override
{
return compunit_symtab;
}
/* True if the symtab corresponding to this psymtab has been
readin. */
bool readin = false;
/* Pointer to compunit eventually allocated for this source file, 0 if
!readin or if we haven't looked for the symtab after it was readin. */
@ -300,16 +337,16 @@ struct partial_symtab
not be used in new code, but exists to transition the somewhat
unmaintained "legacy" debug formats. */
struct legacy_psymtab : public partial_symtab
struct legacy_psymtab : public standard_psymtab
{
legacy_psymtab (const char *filename, struct objfile *objfile)
: partial_symtab (filename, objfile)
: standard_psymtab (filename, objfile)
{
}
legacy_psymtab (const char *filename, struct objfile *objfile,
CORE_ADDR addr)
: partial_symtab (filename, objfile, addr)
: standard_psymtab (filename, objfile, addr)
{
}

41
gdb/psymtab.c
View File

@ -131,7 +131,7 @@ partial_map_expand_apply (struct objfile *objfile,
gdb_assert (pst->user == NULL);
/* Don't visit already-expanded psymtabs. */
if (pst->readin)
if (pst->readin_p ())
return 0;
/* This may expand more than one symtab, and we want to iterate over
@ -385,7 +385,7 @@ psym_find_pc_sect_compunit_symtab (struct objfile *objfile,
msymbol);
if (ps != NULL)
{
if (warn_if_readin && ps->readin)
if (warn_if_readin && ps->readin_p ())
/* Might want to error() here (in case symtab is corrupt and
will cause a core dump), but maybe we can successfully
continue, so let's not. */
@ -393,7 +393,7 @@ psym_find_pc_sect_compunit_symtab (struct objfile *objfile,
(Internal error: pc %s in read in psymtab, but not in symtab.)\n"),
paddress (get_objfile_arch (objfile), pc));
psymtab_to_symtab (objfile, ps);
return ps->compunit_symtab;
return ps->get_compunit_symtab ();
}
return NULL;
}
@ -484,8 +484,8 @@ psym_lookup_symbol (struct objfile *objfile,
for (partial_symtab *ps : require_partial_symbols (objfile, true))
{
if (!ps->readin && lookup_partial_symbol (objfile, ps, name,
psymtab_index, domain))
if (!ps->readin_p () && lookup_partial_symbol (objfile, ps, name,
psymtab_index, domain))
{
struct symbol *sym, *with_opaque = NULL;
struct compunit_symtab *stab = psymtab_to_symtab (objfile, ps);
@ -750,11 +750,11 @@ psymtab_to_symtab (struct objfile *objfile, struct partial_symtab *pst)
pst = pst->user;
/* If it's been looked up before, return it. */
if (pst->compunit_symtab)
return pst->compunit_symtab;
if (pst->get_compunit_symtab ())
return pst->get_compunit_symtab ();
/* If it has not yet been read in, read it. */
if (!pst->readin)
if (!pst->readin_p ())
{
scoped_restore decrementer = increment_reading_symtab ();
@ -772,7 +772,7 @@ psymtab_to_symtab (struct objfile *objfile, struct partial_symtab *pst)
printf_filtered (_("done.\n"));
}
return pst->compunit_symtab;
return pst->get_compunit_symtab ();
}
/* Psymtab version of find_last_source_symtab. See its definition in
@ -795,7 +795,7 @@ psym_find_last_source_symtab (struct objfile *ofp)
if (cs_pst)
{
if (cs_pst->readin)
if (cs_pst->readin_p ())
{
internal_error (__FILE__, __LINE__,
_("select_source_symtab: "
@ -952,11 +952,11 @@ dump_psymtab (struct objfile *objfile, struct partial_symtab *psymtab,
gdb_print_host_address (objfile, outfile);
fprintf_filtered (outfile, ")\n");
if (psymtab->readin)
if (psymtab->readin_p ())
{
fprintf_filtered (outfile,
" Full symtab was read (at ");
gdb_print_host_address (psymtab->compunit_symtab, outfile);
gdb_print_host_address (psymtab->get_compunit_symtab (), outfile);
fprintf_filtered (outfile, ")\n");
}
@ -1010,7 +1010,7 @@ psym_print_stats (struct objfile *objfile)
i = 0;
for (partial_symtab *ps : require_partial_symbols (objfile, true))
{
if (!ps->readin)
if (!ps->readin_p ())
i++;
}
printf_filtered (_(" Number of psym tables (not yet expanded): %d\n"), i);
@ -1050,7 +1050,7 @@ psym_expand_symtabs_for_function (struct objfile *objfile,
{
for (partial_symtab *ps : require_partial_symbols (objfile, true))
{
if (ps->readin)
if (ps->readin_p ())
continue;
if ((lookup_partial_symbol (objfile, ps, func_name, 1, VAR_DOMAIN)
@ -1105,7 +1105,7 @@ psym_map_symbol_filenames (struct objfile *objfile,
{
const char *fullname;
if (ps->readin)
if (ps->readin_p ())
continue;
/* We can skip shared psymtabs here, because any file name will be
@ -1185,7 +1185,7 @@ psym_map_matching_symbols
for (partial_symtab *ps : require_partial_symbols (objfile, true))
{
QUIT;
if (ps->readin
if (ps->readin_p ()
|| match_partial_symbol (objfile, ps, global, name, domain,
ordered_compare))
{
@ -1320,7 +1320,7 @@ psym_expand_symtabs_matching
{
QUIT;
if (ps->readin)
if (ps->readin_p ())
continue;
/* We skip shared psymtabs because file-matching doesn't apply
@ -1659,7 +1659,6 @@ partial_symtab::partial_symtab (const char *filename_, struct objfile *objfile)
filename
= ((const char *) objfile->per_bfd->filename_cache.insert
(filename_, strlen (filename_) + 1));
compunit_symtab = NULL;
if (symtab_create_debug)
{
@ -1689,7 +1688,7 @@ partial_symtab::read_dependencies (struct objfile *objfile)
{
for (int i = 0; i < number_of_dependencies; ++i)
{
if (!dependencies[i]->readin)
if (!dependencies[i]->readin_p ())
{
/* Inform about additional files to be read in. */
if (info_verbose)
@ -2001,7 +2000,7 @@ maintenance_info_psymtabs (const char *regexp, int from_tty)
host_address_to_string (psymtab));
printf_filtered (" readin %s\n",
psymtab->readin ? "yes" : "no");
psymtab->readin_p () ? "yes" : "no");
printf_filtered (" fullname %s\n",
psymtab->fullname
? psymtab->fullname : "(null)");
@ -2092,7 +2091,7 @@ maintenance_check_psymtabs (const char *ignore, int from_tty)
/* We don't call psymtab_to_symtab here because that may cause symtab
expansion. When debugging a problem it helps if checkers leave
things unchanged. */
cust = ps->compunit_symtab;
cust = ps->get_compunit_symtab ();
/* First do some checks that don't require the associated symtab. */
if (ps->text_high (objfile) < ps->text_low (objfile))