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binutils-gdb/gdb/symmisc.c
Pedro Alves f50776aad5 For PPC64/ELFv1: Introduce mst_data_gnu_ifunc 
Running the new tests added later in the series on PPC64 (ELFv1)
revealed that the current ifunc support needs a bit of a design rework
to work properly on PPC64/ELFv1, as most of the new tests fail.  The
ifunc support only kind of works today if the ifunc symbol and the
resolver have the same name, as is currently tested by the
gdb.base/gnu-ifunc.exp testcase, which is unlike how ifuncs are
written nowadays.

The crux of the problem is that ifunc symbols are really function
descriptors, not text symbols:

   44: 0000000000020060    104 FUNC    GLOBAL DEFAULT       18 gnu_ifunc_resolver
   54: 0000000000020060    104 GNU_IFUNC GLOBAL DEFAULT     18 gnu_ifunc

But, currently GDB only knows about ifunc symbols that are text
symbols.  GDB's support happens to work in practice for PPC64 when the
ifunc and resolver are one and only, like in the current
gdb.base/gnu-ifunc.exp testcase:

   15: 0000000000020060    104 GNU_IFUNC GLOBAL DEFAULT       18 gnu_ifunc

because in that case, the synthetic ".gnu_ifunc" entry point text
symbol that bfd creates from the actual GNU ifunc "gnu_ifunc" function
(descriptor) symbol ends up with the the "is a gnu ifunc" flag set /
copied over:

  (gdb) maint print msymbols
  ...
  [ 8] i 0x9c4 .gnu_ifunc section .text                <<< mst_text_gnu_ifunc
  ...
  [29] D 0x20060 gnu_ifunc section .opd  crtstuff.c    <<< mst_data

But, if the resolver gets a distinct symbol/name from the ifunc
symbol, then we end up with this:

  (gdb) maint print msymbols
  [ 8] T 0x9e4 .gnu_ifunc_resolver section .text               <<< mst_text
  ...
  [29] D 0x20060 gnu_ifunc section .opd  crtstuff.c            <<< mst_data
  [30] D 0x20060 gnu_ifunc_resolver section .opd  crtstuff.c   <<< mst_data

I have a follow up bfd patch that turns that into:

   (gdb) maint print msymbols
+  [ 8] i 0x9e4 .gnu_ifunc section .text               <<< mst_text_gnu_ifunc
   [ 8] T 0x9e4 .gnu_ifunc_resolver section .text      <<< mst_text
   ...
   [29] D 0x20060 gnu_ifunc section .opd  crtstuff.c
   [30] D 0x20060 gnu_ifunc_resolver section .opd  crtstuff.c

but that won't help everything.  We still need this patch.

Specifically, when we do a symbol lookup by name, like e.g., to call a
function (see c-exp.y hunk), e.g., "p gnu_ifunc()", then we need to
know that the found "gnu_ifunc" minimal symbol is an ifunc in order to
do some special processing.  But, on PPC, that lookup by name finds
the function descriptor symbol, which presently is just a mst_data
symbol, while at present, we look for mst_text_gnu_ifunc symbols to
decide whether to do special GNU ifunc processing.  In most of those
places, we could try to resolve the function descriptor with
gdbarch_convert_from_func_ptr_addr, and then lookup the minimal symbol
at the resolved PC, see if that finds a minimal symbol of type
mst_text_gnu_ifunc.  If so, then we could assume that the original
mst_dadta / function descriptor "gnu_ifunc" symbol was an ifunc.  I
tried it, and it mostly works, even if it's not the most efficient.

However, there's one case that can't work with such a design -- it's
that of the user calling the ifunc resolver directly to debug it, like
"p gnu_ifunc_resolver(0)", expecting that to return the function
pointer of the final function (which is exercised by the new tests
added later).  In this case, with the not-fully-working solution, we'd
resolve the function descriptor, find that there's an
mst_text_gnu_ifunc symbol for the resolved address, and proceed
calling the function as if we tried to call "gnu_ifunc", the
user-visible GNU ifunc symbol, instead of the resolver.  I.e., it'd be
impossible to call the resolver directly as a normal function.

Introducing mst_data_gnu_ifunc eliminates the need for several
gdbarch_convert_from_func_ptr_addr calls, and, fixes the "call
resolver directly" use case mentioned above too.  It's the cleanest
approach I could think of.

In sum, we make GNU ifunc function descriptor symbols get a new
"mst_data_gnu_ifunc" minimal symbol type instead of the bare mst_data
type.  So when symbol lookup by name finds such a minimal symbol, we
know we found an ifunc symbol, without resolving the entry/text
symbol.  If the user calls the the resolver symbol instead, like "p
gnu_ifunc_resolver(0)", then we'll find the regular mst_data symbol
for "gnu_ifunc_resolver", and we'll call the resolver function as just
another regular function.

With this, most of the GNU ifunc tests added by a later patch pass on
PPC64 too.  The following bfd patch fixes the remaining issues.

gdb/ChangeLog:
2018-04-26  Pedro Alves  <palves@redhat.com>

	* breakpoint.c (set_breakpoint_location_function): Handle
	mst_data_gnu_ifunc.
	* c-exp.y (variable production): Handle mst_data_gnu_ifunc.
	* elfread.c (elf_symtab_read): Give data symbols with
	BSF_GNU_INDIRECT_FUNCTION set mst_data_gnu_ifunc type.
	(elf_rel_plt_read): Update comment.
	* linespec.c (convert_linespec_to_sals): Handle
	mst_data_gnu_ifunc.
	(minsym_found): Handle mst_data_gnu_ifunc.
	* minsyms.c (msymbol_is_function, minimal_symbol_reader::record)
	(find_solib_trampoline_target): Handle mst_data_gnu_ifunc.
	* parse.c (find_minsym_type_and_address): Handle
	mst_data_gnu_ifunc.
	* symmisc.c (dump_msymbols): Handle mst_data_gnu_ifunc.
	* symtab.c (find_gnu_ifunc): Handle mst_data_gnu_ifunc.
	* symtab.h (minimal_symbol_type) <mst_text_gnu_ifunc>: Update
	comment.
	<mst_data_gnu_ifunc>: New enumerator.
2018-04-26 13:09:16 +01:00

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/* Do various things to symbol tables (other than lookup), for GDB.
Copyright (C) 1986-2018 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 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/>. */
#include "defs.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "bfd.h"
#include "filenames.h"
#include "symfile.h"
#include "objfiles.h"
#include "breakpoint.h"
#include "command.h"
#include "gdb_obstack.h"
#include "language.h"
#include "bcache.h"
#include "block.h"
#include "gdb_regex.h"
#include <sys/stat.h>
#include "dictionary.h"
#include "typeprint.h"
#include "gdbcmd.h"
#include "source.h"
#include "readline/readline.h"
#include "psymtab.h"
/* Unfortunately for debugging, stderr is usually a macro. This is painful
when calling functions that take FILE *'s from the debugger.
So we make a variable which has the same value and which is accessible when
debugging GDB with itself. Because stdin et al need not be constants,
we initialize them in the _initialize_symmisc function at the bottom
of the file. */
FILE *std_in;
FILE *std_out;
FILE *std_err;
/* Prototypes for local functions */
static int block_depth (struct block *);
static void print_symbol (struct gdbarch *gdbarch, struct symbol *symbol,
int depth, ui_file *outfile);
void
print_symbol_bcache_statistics (void)
{
struct program_space *pspace;
struct objfile *objfile;
ALL_PSPACES (pspace)
ALL_PSPACE_OBJFILES (pspace, objfile)
{
QUIT;
printf_filtered (_("Byte cache statistics for '%s':\n"),
objfile_name (objfile));
print_bcache_statistics (psymbol_bcache_get_bcache (objfile->psymbol_cache),
"partial symbol cache");
print_bcache_statistics (objfile->per_bfd->macro_cache,
"preprocessor macro cache");
print_bcache_statistics (objfile->per_bfd->filename_cache,
"file name cache");
}
}
void
print_objfile_statistics (void)
{
struct program_space *pspace;
struct objfile *objfile;
struct compunit_symtab *cu;
struct symtab *s;
int i, linetables, blockvectors;
ALL_PSPACES (pspace)
ALL_PSPACE_OBJFILES (pspace, objfile)
{
QUIT;
printf_filtered (_("Statistics for '%s':\n"), objfile_name (objfile));
if (OBJSTAT (objfile, n_stabs) > 0)
printf_filtered (_(" Number of \"stab\" symbols read: %d\n"),
OBJSTAT (objfile, n_stabs));
if (objfile->per_bfd->n_minsyms > 0)
printf_filtered (_(" Number of \"minimal\" symbols read: %d\n"),
objfile->per_bfd->n_minsyms);
if (OBJSTAT (objfile, n_psyms) > 0)
printf_filtered (_(" Number of \"partial\" symbols read: %d\n"),
OBJSTAT (objfile, n_psyms));
if (OBJSTAT (objfile, n_syms) > 0)
printf_filtered (_(" Number of \"full\" symbols read: %d\n"),
OBJSTAT (objfile, n_syms));
if (OBJSTAT (objfile, n_types) > 0)
printf_filtered (_(" Number of \"types\" defined: %d\n"),
OBJSTAT (objfile, n_types));
if (objfile->sf)
objfile->sf->qf->print_stats (objfile);
i = linetables = blockvectors = 0;
ALL_OBJFILE_FILETABS (objfile, cu, s)
{
i++;
if (SYMTAB_LINETABLE (s) != NULL)
linetables++;
}
ALL_OBJFILE_COMPUNITS (objfile, cu)
blockvectors++;
printf_filtered (_(" Number of symbol tables: %d\n"), i);
printf_filtered (_(" Number of symbol tables with line tables: %d\n"),
linetables);
printf_filtered (_(" Number of symbol tables with blockvectors: %d\n"),
blockvectors);
if (OBJSTAT (objfile, sz_strtab) > 0)
printf_filtered (_(" Space used by string tables: %d\n"),
OBJSTAT (objfile, sz_strtab));
printf_filtered (_(" Total memory used for objfile obstack: %s\n"),
pulongest (obstack_memory_used (&objfile
->objfile_obstack)));
printf_filtered (_(" Total memory used for BFD obstack: %s\n"),
pulongest (obstack_memory_used (&objfile->per_bfd
->storage_obstack)));
printf_filtered (_(" Total memory used for psymbol cache: %d\n"),
bcache_memory_used (psymbol_bcache_get_bcache
(objfile->psymbol_cache)));
printf_filtered (_(" Total memory used for macro cache: %d\n"),
bcache_memory_used (objfile->per_bfd->macro_cache));
printf_filtered (_(" Total memory used for file name cache: %d\n"),
bcache_memory_used (objfile->per_bfd->filename_cache));
}
}
static void
dump_objfile (struct objfile *objfile)
{
struct compunit_symtab *cust;
struct symtab *symtab;
printf_filtered ("\nObject file %s: ", objfile_name (objfile));
printf_filtered ("Objfile at ");
gdb_print_host_address (objfile, gdb_stdout);
printf_filtered (", bfd at ");
gdb_print_host_address (objfile->obfd, gdb_stdout);
printf_filtered (", %d minsyms\n\n",
objfile->per_bfd->minimal_symbol_count);
if (objfile->sf)
objfile->sf->qf->dump (objfile);
if (objfile->compunit_symtabs != NULL)
{
printf_filtered ("Symtabs:\n");
ALL_OBJFILE_FILETABS (objfile, cust, symtab)
{
printf_filtered ("%s at ", symtab_to_filename_for_display (symtab));
gdb_print_host_address (symtab, gdb_stdout);
printf_filtered (", ");
if (SYMTAB_OBJFILE (symtab) != objfile)
{
printf_filtered ("NOT ON CHAIN! ");
}
wrap_here (" ");
}
printf_filtered ("\n\n");
}
}
/* Print minimal symbols from this objfile. */
static void
dump_msymbols (struct objfile *objfile, struct ui_file *outfile)
{
struct gdbarch *gdbarch = get_objfile_arch (objfile);
struct minimal_symbol *msymbol;
int index;
char ms_type;
fprintf_filtered (outfile, "\nObject file %s:\n\n", objfile_name (objfile));
if (objfile->per_bfd->minimal_symbol_count == 0)
{
fprintf_filtered (outfile, "No minimal symbols found.\n");
return;
}
index = 0;
ALL_OBJFILE_MSYMBOLS (objfile, msymbol)
{
struct obj_section *section = MSYMBOL_OBJ_SECTION (objfile, msymbol);
switch (MSYMBOL_TYPE (msymbol))
{
case mst_unknown:
ms_type = 'u';
break;
case mst_text:
ms_type = 'T';
break;
case mst_text_gnu_ifunc:
case mst_data_gnu_ifunc:
ms_type = 'i';
break;
case mst_solib_trampoline:
ms_type = 'S';
break;
case mst_data:
ms_type = 'D';
break;
case mst_bss:
ms_type = 'B';
break;
case mst_abs:
ms_type = 'A';
break;
case mst_file_text:
ms_type = 't';
break;
case mst_file_data:
ms_type = 'd';
break;
case mst_file_bss:
ms_type = 'b';
break;
default:
ms_type = '?';
break;
}
fprintf_filtered (outfile, "[%2d] %c ", index, ms_type);
fputs_filtered (paddress (gdbarch, MSYMBOL_VALUE_ADDRESS (objfile,
msymbol)),
outfile);
fprintf_filtered (outfile, " %s", MSYMBOL_LINKAGE_NAME (msymbol));
if (section)
{
if (section->the_bfd_section != NULL)
fprintf_filtered (outfile, " section %s",
bfd_section_name (objfile->obfd,
section->the_bfd_section));
else
fprintf_filtered (outfile, " spurious section %ld",
(long) (section - objfile->sections));
}
if (MSYMBOL_DEMANGLED_NAME (msymbol) != NULL)
{
fprintf_filtered (outfile, " %s", MSYMBOL_DEMANGLED_NAME (msymbol));
}
if (msymbol->filename)
fprintf_filtered (outfile, " %s", msymbol->filename);
fputs_filtered ("\n", outfile);
index++;
}
if (objfile->per_bfd->minimal_symbol_count != index)
{
warning (_("internal error: minimal symbol count %d != %d"),
objfile->per_bfd->minimal_symbol_count, index);
}
fprintf_filtered (outfile, "\n");
}
static void
dump_symtab_1 (struct symtab *symtab, struct ui_file *outfile)
{
struct objfile *objfile = SYMTAB_OBJFILE (symtab);
struct gdbarch *gdbarch = get_objfile_arch (objfile);
int i;
struct dict_iterator iter;
int len;
struct linetable *l;
const struct blockvector *bv;
struct symbol *sym;
struct block *b;
int depth;
fprintf_filtered (outfile, "\nSymtab for file %s\n",
symtab_to_filename_for_display (symtab));
if (SYMTAB_DIRNAME (symtab) != NULL)
fprintf_filtered (outfile, "Compilation directory is %s\n",
SYMTAB_DIRNAME (symtab));
fprintf_filtered (outfile, "Read from object file %s (",
objfile_name (objfile));
gdb_print_host_address (objfile, outfile);
fprintf_filtered (outfile, ")\n");
fprintf_filtered (outfile, "Language: %s\n",
language_str (symtab->language));
/* First print the line table. */
l = SYMTAB_LINETABLE (symtab);
if (l)
{
fprintf_filtered (outfile, "\nLine table:\n\n");
len = l->nitems;
for (i = 0; i < len; i++)
{
fprintf_filtered (outfile, " line %d at ", l->item[i].line);
fputs_filtered (paddress (gdbarch, l->item[i].pc), outfile);
fprintf_filtered (outfile, "\n");
}
}
/* Now print the block info, but only for compunit symtabs since we will
print lots of duplicate info otherwise. */
if (symtab == COMPUNIT_FILETABS (SYMTAB_COMPUNIT (symtab)))
{
fprintf_filtered (outfile, "\nBlockvector:\n\n");
bv = SYMTAB_BLOCKVECTOR (symtab);
len = BLOCKVECTOR_NBLOCKS (bv);
for (i = 0; i < len; i++)
{
b = BLOCKVECTOR_BLOCK (bv, i);
depth = block_depth (b) * 2;
print_spaces (depth, outfile);
fprintf_filtered (outfile, "block #%03d, object at ", i);
gdb_print_host_address (b, outfile);
if (BLOCK_SUPERBLOCK (b))
{
fprintf_filtered (outfile, " under ");
gdb_print_host_address (BLOCK_SUPERBLOCK (b), outfile);
}
/* drow/2002-07-10: We could save the total symbols count
even if we're using a hashtable, but nothing else but this message
wants it. */
fprintf_filtered (outfile, ", %d syms/buckets in ",
dict_size (BLOCK_DICT (b)));
fputs_filtered (paddress (gdbarch, BLOCK_START (b)), outfile);
fprintf_filtered (outfile, "..");
fputs_filtered (paddress (gdbarch, BLOCK_END (b)), outfile);
if (BLOCK_FUNCTION (b))
{
fprintf_filtered (outfile, ", function %s",
SYMBOL_LINKAGE_NAME (BLOCK_FUNCTION (b)));
if (SYMBOL_DEMANGLED_NAME (BLOCK_FUNCTION (b)) != NULL)
{
fprintf_filtered (outfile, ", %s",
SYMBOL_DEMANGLED_NAME (BLOCK_FUNCTION (b)));
}
}
fprintf_filtered (outfile, "\n");
/* Now print each symbol in this block (in no particular order, if
we're using a hashtable). Note that we only want this
block, not any blocks from included symtabs. */
ALL_DICT_SYMBOLS (BLOCK_DICT (b), iter, sym)
{
TRY
{
print_symbol (gdbarch, sym, depth + 1, outfile);
}
CATCH (ex, RETURN_MASK_ERROR)
{
exception_fprintf (gdb_stderr, ex,
"Error printing symbol:\n");
}
END_CATCH
}
}
fprintf_filtered (outfile, "\n");
}
else
{
const char *compunit_filename
= symtab_to_filename_for_display (COMPUNIT_FILETABS (SYMTAB_COMPUNIT (symtab)));
fprintf_filtered (outfile,
"\nBlockvector same as owning compunit: %s\n\n",
compunit_filename);
}
}
static void
dump_symtab (struct symtab *symtab, struct ui_file *outfile)
{
/* Set the current language to the language of the symtab we're dumping
because certain routines used during dump_symtab() use the current
language to print an image of the symbol. We'll restore it later.
But use only real languages, not placeholders. */
if (symtab->language != language_unknown
&& symtab->language != language_auto)
{
enum language saved_lang;
saved_lang = set_language (symtab->language);
dump_symtab_1 (symtab, outfile);
set_language (saved_lang);
}
else
dump_symtab_1 (symtab, outfile);
}
static void
maintenance_print_symbols (const char *args, int from_tty)
{
struct ui_file *outfile = gdb_stdout;
char *address_arg = NULL, *source_arg = NULL, *objfile_arg = NULL;
int i, outfile_idx;
dont_repeat ();
gdb_argv argv (args);
for (i = 0; argv != NULL && argv[i] != NULL; ++i)
{
if (strcmp (argv[i], "-pc") == 0)
{
if (argv[i + 1] == NULL)
error (_("Missing pc value"));
address_arg = argv[++i];
}
else if (strcmp (argv[i], "-source") == 0)
{
if (argv[i + 1] == NULL)
error (_("Missing source file"));
source_arg = argv[++i];
}
else if (strcmp (argv[i], "-objfile") == 0)
{
if (argv[i + 1] == NULL)
error (_("Missing objfile name"));
objfile_arg = argv[++i];
}
else if (strcmp (argv[i], "--") == 0)
{
/* End of options. */
++i;
break;
}
else if (argv[i][0] == '-')
{
/* Future proofing: Don't allow OUTFILE to begin with "-". */
error (_("Unknown option: %s"), argv[i]);
}
else
break;
}
outfile_idx = i;
if (address_arg != NULL && source_arg != NULL)
error (_("Must specify at most one of -pc and -source"));
stdio_file arg_outfile;
if (argv != NULL && argv[outfile_idx] != NULL)
{
if (argv[outfile_idx + 1] != NULL)
error (_("Junk at end of command"));
gdb::unique_xmalloc_ptr<char> outfile_name
(tilde_expand (argv[outfile_idx]));
if (!arg_outfile.open (outfile_name.get (), FOPEN_WT))
perror_with_name (outfile_name.get ());
outfile = &arg_outfile;
}
if (address_arg != NULL)
{
CORE_ADDR pc = parse_and_eval_address (address_arg);
struct symtab *s = find_pc_line_symtab (pc);
if (s == NULL)
error (_("No symtab for address: %s"), address_arg);
dump_symtab (s, outfile);
}
else
{
struct objfile *objfile;
struct compunit_symtab *cu;
struct symtab *s;
int found = 0;
ALL_OBJFILES (objfile)
{
int print_for_objfile = 1;
if (objfile_arg != NULL)
print_for_objfile
= compare_filenames_for_search (objfile_name (objfile),
objfile_arg);
if (!print_for_objfile)
continue;
ALL_OBJFILE_FILETABS (objfile, cu, s)
{
int print_for_source = 0;
QUIT;
if (source_arg != NULL)
{
print_for_source
= compare_filenames_for_search
(symtab_to_filename_for_display (s), source_arg);
found = 1;
}
if (source_arg == NULL
|| print_for_source)
dump_symtab (s, outfile);
}
}
if (source_arg != NULL && !found)
error (_("No symtab for source file: %s"), source_arg);
}
}
/* Print symbol SYMBOL on OUTFILE. DEPTH says how far to indent. */
static void
print_symbol (struct gdbarch *gdbarch, struct symbol *symbol,
int depth, ui_file *outfile)
{
struct obj_section *section;
if (SYMBOL_OBJFILE_OWNED (symbol))
section = SYMBOL_OBJ_SECTION (symbol_objfile (symbol), symbol);
else
section = NULL;
print_spaces (depth, outfile);
if (SYMBOL_DOMAIN (symbol) == LABEL_DOMAIN)
{
fprintf_filtered (outfile, "label %s at ", SYMBOL_PRINT_NAME (symbol));
fputs_filtered (paddress (gdbarch, SYMBOL_VALUE_ADDRESS (symbol)),
outfile);
if (section)
fprintf_filtered (outfile, " section %s\n",
bfd_section_name (section->the_bfd_section->owner,
section->the_bfd_section));
else
fprintf_filtered (outfile, "\n");
return;
}
if (SYMBOL_DOMAIN (symbol) == STRUCT_DOMAIN)
{
if (TYPE_TAG_NAME (SYMBOL_TYPE (symbol)))
{
LA_PRINT_TYPE (SYMBOL_TYPE (symbol), "", outfile, 1, depth,
&type_print_raw_options);
}
else
{
fprintf_filtered (outfile, "%s %s = ",
(TYPE_CODE (SYMBOL_TYPE (symbol)) == TYPE_CODE_ENUM
? "enum"
: (TYPE_CODE (SYMBOL_TYPE (symbol)) == TYPE_CODE_STRUCT
? "struct" : "union")),
SYMBOL_LINKAGE_NAME (symbol));
LA_PRINT_TYPE (SYMBOL_TYPE (symbol), "", outfile, 1, depth,
&type_print_raw_options);
}
fprintf_filtered (outfile, ";\n");
}
else
{
if (SYMBOL_CLASS (symbol) == LOC_TYPEDEF)
fprintf_filtered (outfile, "typedef ");
if (SYMBOL_TYPE (symbol))
{
/* Print details of types, except for enums where it's clutter. */
LA_PRINT_TYPE (SYMBOL_TYPE (symbol), SYMBOL_PRINT_NAME (symbol),
outfile,
TYPE_CODE (SYMBOL_TYPE (symbol)) != TYPE_CODE_ENUM,
depth,
&type_print_raw_options);
fprintf_filtered (outfile, "; ");
}
else
fprintf_filtered (outfile, "%s ", SYMBOL_PRINT_NAME (symbol));
switch (SYMBOL_CLASS (symbol))
{
case LOC_CONST:
fprintf_filtered (outfile, "const %s (%s)",
plongest (SYMBOL_VALUE (symbol)),
hex_string (SYMBOL_VALUE (symbol)));
break;
case LOC_CONST_BYTES:
{
unsigned i;
struct type *type = check_typedef (SYMBOL_TYPE (symbol));
fprintf_filtered (outfile, "const %u hex bytes:",
TYPE_LENGTH (type));
for (i = 0; i < TYPE_LENGTH (type); i++)
fprintf_filtered (outfile, " %02x",
(unsigned) SYMBOL_VALUE_BYTES (symbol)[i]);
}
break;
case LOC_STATIC:
fprintf_filtered (outfile, "static at ");
fputs_filtered (paddress (gdbarch, SYMBOL_VALUE_ADDRESS (symbol)),
outfile);
if (section)
fprintf_filtered (outfile, " section %s",
bfd_section_name (section->the_bfd_section->owner,
section->the_bfd_section));
break;
case LOC_REGISTER:
if (SYMBOL_IS_ARGUMENT (symbol))
fprintf_filtered (outfile, "parameter register %s",
plongest (SYMBOL_VALUE (symbol)));
else
fprintf_filtered (outfile, "register %s",
plongest (SYMBOL_VALUE (symbol)));
break;
case LOC_ARG:
fprintf_filtered (outfile, "arg at offset %s",
hex_string (SYMBOL_VALUE (symbol)));
break;
case LOC_REF_ARG:
fprintf_filtered (outfile, "reference arg at %s",
hex_string (SYMBOL_VALUE (symbol)));
break;
case LOC_REGPARM_ADDR:
fprintf_filtered (outfile, "address parameter register %s",
plongest (SYMBOL_VALUE (symbol)));
break;
case LOC_LOCAL:
fprintf_filtered (outfile, "local at offset %s",
hex_string (SYMBOL_VALUE (symbol)));
break;
case LOC_TYPEDEF:
break;
case LOC_LABEL:
fprintf_filtered (outfile, "label at ");
fputs_filtered (paddress (gdbarch, SYMBOL_VALUE_ADDRESS (symbol)),
outfile);
if (section)
fprintf_filtered (outfile, " section %s",
bfd_section_name (section->the_bfd_section->owner,
section->the_bfd_section));
break;
case LOC_BLOCK:
fprintf_filtered (outfile, "block object ");
gdb_print_host_address (SYMBOL_BLOCK_VALUE (symbol), outfile);
fprintf_filtered (outfile, ", ");
fputs_filtered (paddress (gdbarch,
BLOCK_START (SYMBOL_BLOCK_VALUE (symbol))),
outfile);
fprintf_filtered (outfile, "..");
fputs_filtered (paddress (gdbarch,
BLOCK_END (SYMBOL_BLOCK_VALUE (symbol))),
outfile);
if (section)
fprintf_filtered (outfile, " section %s",
bfd_section_name (section->the_bfd_section->owner,
section->the_bfd_section));
break;
case LOC_COMPUTED:
fprintf_filtered (outfile, "computed at runtime");
break;
case LOC_UNRESOLVED:
fprintf_filtered (outfile, "unresolved");
break;
case LOC_OPTIMIZED_OUT:
fprintf_filtered (outfile, "optimized out");
break;
default:
fprintf_filtered (outfile, "botched symbol class %x",
SYMBOL_CLASS (symbol));
break;
}
}
fprintf_filtered (outfile, "\n");
}
static void
maintenance_print_msymbols (const char *args, int from_tty)
{
struct ui_file *outfile = gdb_stdout;
char *objfile_arg = NULL;
struct objfile *objfile;
int i, outfile_idx;
dont_repeat ();
gdb_argv argv (args);
for (i = 0; argv != NULL && argv[i] != NULL; ++i)
{
if (strcmp (argv[i], "-objfile") == 0)
{
if (argv[i + 1] == NULL)
error (_("Missing objfile name"));
objfile_arg = argv[++i];
}
else if (strcmp (argv[i], "--") == 0)
{
/* End of options. */
++i;
break;
}
else if (argv[i][0] == '-')
{
/* Future proofing: Don't allow OUTFILE to begin with "-". */
error (_("Unknown option: %s"), argv[i]);
}
else
break;
}
outfile_idx = i;
stdio_file arg_outfile;
if (argv != NULL && argv[outfile_idx] != NULL)
{
if (argv[outfile_idx + 1] != NULL)
error (_("Junk at end of command"));
gdb::unique_xmalloc_ptr<char> outfile_name
(tilde_expand (argv[outfile_idx]));
if (!arg_outfile.open (outfile_name.get (), FOPEN_WT))
perror_with_name (outfile_name.get ());
outfile = &arg_outfile;
}
ALL_OBJFILES (objfile)
{
QUIT;
if (objfile_arg == NULL
|| compare_filenames_for_search (objfile_name (objfile), objfile_arg))
dump_msymbols (objfile, outfile);
}
}
static void
maintenance_print_objfiles (const char *regexp, int from_tty)
{
struct program_space *pspace;
struct objfile *objfile;
dont_repeat ();
if (regexp)
re_comp (regexp);
ALL_PSPACES (pspace)
ALL_PSPACE_OBJFILES (pspace, objfile)
{
QUIT;
if (! regexp
|| re_exec (objfile_name (objfile)))
dump_objfile (objfile);
}
}
/* List all the symbol tables whose names match REGEXP (optional). */
static void
maintenance_info_symtabs (const char *regexp, int from_tty)
{
struct program_space *pspace;
struct objfile *objfile;
dont_repeat ();
if (regexp)
re_comp (regexp);
ALL_PSPACES (pspace)
ALL_PSPACE_OBJFILES (pspace, objfile)
{
struct compunit_symtab *cust;
struct symtab *symtab;
/* We don't want to print anything for this objfile until we
actually find a symtab whose name matches. */
int printed_objfile_start = 0;
ALL_OBJFILE_COMPUNITS (objfile, cust)
{
int printed_compunit_symtab_start = 0;
ALL_COMPUNIT_FILETABS (cust, symtab)
{
QUIT;
if (! regexp
|| re_exec (symtab_to_filename_for_display (symtab)))
{
if (! printed_objfile_start)
{
printf_filtered ("{ objfile %s ", objfile_name (objfile));
wrap_here (" ");
printf_filtered ("((struct objfile *) %s)\n",
host_address_to_string (objfile));
printed_objfile_start = 1;
}
if (! printed_compunit_symtab_start)
{
printf_filtered (" { ((struct compunit_symtab *) %s)\n",
host_address_to_string (cust));
printf_filtered (" debugformat %s\n",
COMPUNIT_DEBUGFORMAT (cust));
printf_filtered (" producer %s\n",
COMPUNIT_PRODUCER (cust) != NULL
? COMPUNIT_PRODUCER (cust)
: "(null)");
printf_filtered (" dirname %s\n",
COMPUNIT_DIRNAME (cust) != NULL
? COMPUNIT_DIRNAME (cust)
: "(null)");
printf_filtered (" blockvector"
" ((struct blockvector *) %s)\n",
host_address_to_string
(COMPUNIT_BLOCKVECTOR (cust)));
printed_compunit_symtab_start = 1;
}
printf_filtered ("\t{ symtab %s ",
symtab_to_filename_for_display (symtab));
wrap_here (" ");
printf_filtered ("((struct symtab *) %s)\n",
host_address_to_string (symtab));
printf_filtered ("\t fullname %s\n",
symtab->fullname != NULL
? symtab->fullname
: "(null)");
printf_filtered ("\t "
"linetable ((struct linetable *) %s)\n",
host_address_to_string (symtab->linetable));
printf_filtered ("\t}\n");
}
}
if (printed_compunit_symtab_start)
printf_filtered (" }\n");
}
if (printed_objfile_start)
printf_filtered ("}\n");
}
}
/* Check consistency of symtabs.
An example of what this checks for is NULL blockvectors.
They can happen if there's a bug during debug info reading.
GDB assumes they are always non-NULL.
Note: This does not check for psymtab vs symtab consistency.
Use "maint check-psymtabs" for that. */
static void
maintenance_check_symtabs (const char *ignore, int from_tty)
{
struct program_space *pspace;
struct objfile *objfile;
ALL_PSPACES (pspace)
ALL_PSPACE_OBJFILES (pspace, objfile)
{
struct compunit_symtab *cust;
/* We don't want to print anything for this objfile until we
actually find something worth printing. */
int printed_objfile_start = 0;
ALL_OBJFILE_COMPUNITS (objfile, cust)
{
int found_something = 0;
struct symtab *symtab = compunit_primary_filetab (cust);
QUIT;
if (COMPUNIT_BLOCKVECTOR (cust) == NULL)
found_something = 1;
/* Add more checks here. */
if (found_something)
{
if (! printed_objfile_start)
{
printf_filtered ("{ objfile %s ", objfile_name (objfile));
wrap_here (" ");
printf_filtered ("((struct objfile *) %s)\n",
host_address_to_string (objfile));
printed_objfile_start = 1;
}
printf_filtered (" { symtab %s\n",
symtab_to_filename_for_display (symtab));
if (COMPUNIT_BLOCKVECTOR (cust) == NULL)
printf_filtered (" NULL blockvector\n");
printf_filtered (" }\n");
}
}
if (printed_objfile_start)
printf_filtered ("}\n");
}
}
/* Expand all symbol tables whose name matches an optional regexp. */
static void
maintenance_expand_symtabs (const char *args, int from_tty)
{
struct program_space *pspace;
struct objfile *objfile;
char *regexp = NULL;
/* We use buildargv here so that we handle spaces in the regexp
in a way that allows adding more arguments later. */
gdb_argv argv (args);
if (argv != NULL)
{
if (argv[0] != NULL)
{
regexp = argv[0];
if (argv[1] != NULL)
error (_("Extra arguments after regexp."));
}
}
if (regexp)
re_comp (regexp);
ALL_PSPACES (pspace)
ALL_PSPACE_OBJFILES (pspace, objfile)
{
if (objfile->sf)
{
objfile->sf->qf->expand_symtabs_matching
(objfile,
[&] (const char *filename, bool basenames)
{
/* KISS: Only apply the regexp to the complete file name. */
return (!basenames
&& (regexp == NULL || re_exec (filename)));
},
lookup_name_info::match_any (),
[] (const char *symname)
{
/* Since we're not searching on symbols, just return true. */
return true;
},
NULL,
ALL_DOMAIN);
}
}
}
/* Return the nexting depth of a block within other blocks in its symtab. */
static int
block_depth (struct block *block)
{
int i = 0;
while ((block = BLOCK_SUPERBLOCK (block)) != NULL)
{
i++;
}
return i;
}
/* Used by MAINTENANCE_INFO_LINE_TABLES to print the information about a
single line table. */
static int
maintenance_print_one_line_table (struct symtab *symtab, void *data)
{
struct linetable *linetable;
struct objfile *objfile;
objfile = symtab->compunit_symtab->objfile;
printf_filtered (_("objfile: %s ((struct objfile *) %s)\n"),
objfile_name (objfile),
host_address_to_string (objfile));
printf_filtered (_("compunit_symtab: ((struct compunit_symtab *) %s)\n"),
host_address_to_string (symtab->compunit_symtab));
printf_filtered (_("symtab: %s ((struct symtab *) %s)\n"),
symtab_to_fullname (symtab),
host_address_to_string (symtab));
linetable = SYMTAB_LINETABLE (symtab);
printf_filtered (_("linetable: ((struct linetable *) %s):\n"),
host_address_to_string (linetable));
if (linetable == NULL)
printf_filtered (_("No line table.\n"));
else if (linetable->nitems <= 0)
printf_filtered (_("Line table has no lines.\n"));
else
{
int i;
/* Leave space for 6 digits of index and line number. After that the
tables will just not format as well. */
printf_filtered (_("%-6s %6s %s\n"),
_("INDEX"), _("LINE"), _("ADDRESS"));
for (i = 0; i < linetable->nitems; ++i)
{
struct linetable_entry *item;
item = &linetable->item [i];
printf_filtered (_("%-6d %6d %s\n"), i, item->line,
core_addr_to_string (item->pc));
}
}
return 0;
}
/* Implement the 'maint info line-table' command. */
static void
maintenance_info_line_tables (const char *regexp, int from_tty)
{
struct program_space *pspace;
struct objfile *objfile;
dont_repeat ();
if (regexp != NULL)
re_comp (regexp);
ALL_PSPACES (pspace)
ALL_PSPACE_OBJFILES (pspace, objfile)
{
struct compunit_symtab *cust;
struct symtab *symtab;
ALL_OBJFILE_COMPUNITS (objfile, cust)
{
ALL_COMPUNIT_FILETABS (cust, symtab)
{
QUIT;
if (regexp == NULL
|| re_exec (symtab_to_filename_for_display (symtab)))
maintenance_print_one_line_table (symtab, NULL);
}
}
}
}
/* Do early runtime initializations. */
void
_initialize_symmisc (void)
{
std_in = stdin;
std_out = stdout;
std_err = stderr;
add_cmd ("symbols", class_maintenance, maintenance_print_symbols, _("\
Print dump of current symbol definitions.\n\
Usage: mt print symbols [-pc address] [--] [outfile]\n\
mt print symbols [-objfile objfile] [-source source] [--] [outfile]\n\
Entries in the full symbol table are dumped to file OUTFILE,\n\
or the terminal if OUTFILE is unspecified.\n\
If ADDRESS is provided, dump only the file for that address.\n\
If SOURCE is provided, dump only that file's symbols.\n\
If OBJFILE is provided, dump only that file's minimal symbols."),
&maintenanceprintlist);
add_cmd ("msymbols", class_maintenance, maintenance_print_msymbols, _("\
Print dump of current minimal symbol definitions.\n\
Usage: mt print msymbols [-objfile objfile] [--] [outfile]\n\
Entries in the minimal symbol table are dumped to file OUTFILE,\n\
or the terminal if OUTFILE is unspecified.\n\
If OBJFILE is provided, dump only that file's minimal symbols."),
&maintenanceprintlist);
add_cmd ("objfiles", class_maintenance, maintenance_print_objfiles,
_("Print dump of current object file definitions.\n\
With an argument REGEXP, list the object files with matching names."),
&maintenanceprintlist);
add_cmd ("symtabs", class_maintenance, maintenance_info_symtabs, _("\
List the full symbol tables for all object files.\n\
This does not include information about individual symbols, blocks, or\n\
linetables --- just the symbol table structures themselves.\n\
With an argument REGEXP, list the symbol tables with matching names."),
&maintenanceinfolist);
add_cmd ("line-table", class_maintenance, maintenance_info_line_tables, _("\
List the contents of all line tables, from all symbol tables.\n\
With an argument REGEXP, list just the line tables for the symbol\n\
tables with matching names."),
&maintenanceinfolist);
add_cmd ("check-symtabs", class_maintenance, maintenance_check_symtabs,
_("\
Check consistency of currently expanded symtabs."),
&maintenancelist);
add_cmd ("expand-symtabs", class_maintenance, maintenance_expand_symtabs,
_("Expand symbol tables.\n\
With an argument REGEXP, only expand the symbol tables with matching names."),
&maintenancelist);
}
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