At <https://sourceware.org/ml/gdb-patches/2017-12/msg00298.html>, Joel
wrote:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Consider the following code which first declares a tagged type (the
equivalent of a class in Ada), and then a procedure which takes a
pointer (access) to this type's 'Class.
package Pck is
type Top_T is tagged record
N : Integer := 1;
end record;
procedure Inspect (Obj: access Top_T'Class);
end Pck;
Putting a breakpoint in that procedure and then running to it triggers
an internal error:
(gdb) break inspect
(gdb) continue
Breakpoint 1, pck.inspect (obj=0x63e010
/[...]/gdb/stack.c:621: internal-error: void print_frame_args(symbol*, frame_info*, int, ui_file*): Assertion `nsym != NULL' failed.
What's special about this subprogram is that it takes an access to
what we call a 'Class type, and for implementation reasons, the
compiler adds an extra argument named "objL". If you are curious why,
it allows the compiler for perform dynamic accessibility checks that
are mandated by the language.
If we look at the location where we get the internal error (in
stack.c), we find that we are looping over the symbol of each
parameter, and for each parameter, we do:
/* We have to look up the symbol because arguments can have
two entries (one a parameter, one a local) and the one we
want is the local, which lookup_symbol will find for us.
[...]
nsym = lookup_symbol (SYMBOL_LINKAGE_NAME (sym),
b, VAR_DOMAIN, NULL).symbol;
gdb_assert (nsym != NULL);
The lookup_symbol goes through the lookup structure, which means the
symbol's linkage name ("objL") gets transformed into a
lookup_name_info object (in block_lookup_symbol), before it gets fed
to the block symbol dictionary iterators. This, in turn, triggers the
symbol matching by comparing the "lookup" name which, for Ada, means
among other things, lowercasing the given name to "objl". It is this
transformation that causes the lookup find no matches, and therefore
trip this assertion.
Going back to the "offending" call to lookup_symbol in stack.c, what
we are trying to do, here, is do a lookup by linkage name. So, I
think what we mean to be doing is a completely literal symbol lookup,
so maybe not even strcmp_iw, but actually just plain strcmp???
In the past, in practice, you could get that effect by doing a lookup
using the C language. But that doesn't work, because we still end up
somehow using Ada's lookup_name routine which transforms "objL".
So, ideally, as I hinted before, I think what we need is a way to
perform a literal lookup so that searches by linkage names like the
above can be performed.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This commit fixes the problem by implementing something similar to
Joel's literal idea, but with some important differences.
I considered adding a symbol_name_match_type::LINKAGE and supporting
searching by linkage name for any language, but the problem with that
is that the dictionaries only work with SYMBOL_SEARCH_NAME, because
that's what is used for hashing. We'd need separate dictionaries for
hashed linkage names.
So with the current symbol tables infrastructure, it's not literal
linkage names that we want to pass down, but instead literal _search_
names (SYMBOL_SEARCH_NAME, etc.).
However, psymbols have no overload/function parameter info in C++, so
a straight strcmp doesn't work properly for C++ name matching.
So what we do is be a little less aggressive then and add a new
symbol_name_match_type::SEARCH_SYMBOL instead that takes as input a
non-user-input search symbol, and then we skip any decoding/demangling
steps and make:
- Ada treat that as a verbatim match,
- other languages treat it as symbol_name_match_type::FULL.
This also fixes the new '"maint check-psymtabs" for Ada' testcase for
me (gdb.ada/maint_with_ada.exp). I've not removed the kfail yet
because Joel still sees that testcase failing with this patch.
That'll be fixed in follow up patches.
gdb/ChangeLog:
2018-01-05 Pedro Alves <palves@redhat.com>
PR gdb/22670
* ada-lang.c (literal_symbol_name_matcher): New function.
(ada_get_symbol_name_matcher): Use it for
symbol_name_match_type::SEARCH_NAME.
* block.c (block_lookup_symbol): New parameter 'match_type'. Pass
it down instead of assuming symbol_name_match_type::FULL.
* block.h (block_lookup_symbol): New parameter 'match_type'.
* c-valprint.c (print_unpacked_pointer): Use
lookup_symbol_search_name instead of lookup_symbol.
* compile/compile-object-load.c (get_out_value_type): Pass down
symbol_name_match_type::SEARCH_NAME.
* cp-namespace.c (cp_basic_lookup_symbol): Pass down
symbol_name_match_type::FULL.
* cp-support.c (cp_get_symbol_name_matcher): Handle
symbol_name_match_type::SEARCH_NAME.
* infrun.c (insert_exception_resume_breakpoint): Use
lookup_symbol_search_name.
* p-valprint.c (pascal_val_print): Use lookup_symbol_search_name.
* psymtab.c (maintenance_check_psymtabs): Use
symbol_name_match_type::SEARCH_NAME and SYMBOL_SEARCH_NAME.
* stack.c (print_frame_args): Use lookup_symbol_search_name and
SYMBOL_SEARCH_NAME.
* symtab.c (lookup_local_symbol): Don't demangle the lookup name
if symbol_name_match_type::SEARCH_NAME.
(lookup_symbol_in_language): Pass down
symbol_name_match_type::FULL.
(lookup_symbol_search_name): New.
(lookup_language_this): Pass down
symbol_name_match_type::SEARCH_NAME.
(lookup_symbol_aux, lookup_local_symbol): New parameter
'match_type'. Pass it down.
* symtab.h (symbol_name_match_type::SEARCH_NAME): New enumerator.
(lookup_symbol_search_name): New declaration.
(lookup_symbol_in_block): New 'match_type' parameter.
gdb/testsuite/ChangeLog:
2018-01-05 Joel Brobecker <brobecker@adacore.com>
PR gdb/22670
* gdb.ada/access_tagged_param.exp: New file.
* gdb.ada/access_tagged_param/foo.adb: New file.
2018-01-05 Pedro Alves <palves@redhat.com>
PR gdb/22670
+ * ada-lang.c (literal_symbol_name_matcher): New function.
+ (ada_get_symbol_name_matcher): Use it for
+ symbol_name_match_type::SEARCH_NAME.
+ * block.c (block_lookup_symbol): New parameter 'match_type'. Pass
+ it down instead of assuming symbol_name_match_type::FULL.
+ * block.h (block_lookup_symbol): New parameter 'match_type'.
+ * c-valprint.c (print_unpacked_pointer): Use
+ lookup_symbol_search_name instead of lookup_symbol.
+ * compile/compile-object-load.c (get_out_value_type): Pass down
+ symbol_name_match_type::SEARCH_NAME.
+ * cp-namespace.c (cp_basic_lookup_symbol): Pass down
+ symbol_name_match_type::FULL.
+ * cp-support.c (cp_get_symbol_name_matcher): Handle
+ symbol_name_match_type::SEARCH_NAME.
+ * infrun.c (insert_exception_resume_breakpoint): Use
+ lookup_symbol_search_name.
+ * p-valprint.c (pascal_val_print): Use lookup_symbol_search_name.
+ * psymtab.c (maintenance_check_psymtabs): Use
+ symbol_name_match_type::SEARCH_NAME and SYMBOL_SEARCH_NAME.
+ * stack.c (print_frame_args): Use lookup_symbol_search_name and
+ SYMBOL_SEARCH_NAME.
+ * symtab.c (lookup_local_symbol): Don't demangle the lookup name
+ if symbol_name_match_type::SEARCH_NAME.
+ (lookup_symbol_in_language): Pass down
+ symbol_name_match_type::FULL.
+ (lookup_symbol_search_name): New.
+ (lookup_language_this): Pass down
+ symbol_name_match_type::SEARCH_NAME.
+ (lookup_symbol_aux, lookup_local_symbol): New parameter
+ 'match_type'. Pass it down.
+ * symtab.h (symbol_name_match_type::SEARCH_NAME): New enumerator.
+ (lookup_symbol_search_name): New declaration.
+ (lookup_symbol_in_block): New 'match_type' parameter.
+
+2018-01-05 Pedro Alves <palves@redhat.com>
+
+ PR gdb/22670
* ada-lang.c (ada_lookup_encoded_symbol): Reimplement in terms of
ada_lookup_symbol.
(ada_lookup_symbol): Reimplement in terms of
comp_match_res);
}
+/* A name matcher that matches the symbol name exactly, with
+ strcmp. */
+
+static bool
+literal_symbol_name_matcher (const char *symbol_search_name,
+ const lookup_name_info &lookup_name,
+ completion_match_result *comp_match_res)
+{
+ const std::string &name = lookup_name.name ();
+
+ int cmp = (lookup_name.completion_mode ()
+ ? strncmp (symbol_search_name, name.c_str (), name.size ())
+ : strcmp (symbol_search_name, name.c_str ()));
+ if (cmp == 0)
+ {
+ if (comp_match_res != NULL)
+ comp_match_res->set_match (symbol_search_name);
+ return true;
+ }
+ else
+ return false;
+}
+
/* Implement the "la_get_symbol_name_matcher" language_defn method for
Ada. */
static symbol_name_matcher_ftype *
ada_get_symbol_name_matcher (const lookup_name_info &lookup_name)
{
+ if (lookup_name.match_type () == symbol_name_match_type::SEARCH_NAME)
+ return literal_symbol_name_matcher;
+
if (lookup_name.completion_mode ())
return ada_symbol_name_matches;
else
struct symbol *
block_lookup_symbol (const struct block *block, const char *name,
+ symbol_name_match_type match_type,
const domain_enum domain)
{
struct block_iterator iter;
struct symbol *sym;
- lookup_name_info lookup_name (name, symbol_name_match_type::FULL);
+ lookup_name_info lookup_name (name, match_type);
if (!BLOCK_FUNCTION (block))
{
extern struct symbol *block_lookup_symbol (const struct block *block,
const char *name,
+ symbol_name_match_type match_type,
const domain_enum domain);
/* Search BLOCK for symbol NAME in DOMAIN but only in primary symbol table of
struct symbol *wsym = NULL;
struct type *wtype;
struct block *block = NULL;
- struct field_of_this_result is_this_fld;
if (want_space)
fputs_filtered (" ", stream);
if (msymbol.minsym != NULL)
- wsym = lookup_symbol (MSYMBOL_LINKAGE_NAME(msymbol.minsym), block,
- VAR_DOMAIN, &is_this_fld).symbol;
+ {
+ const char *search_name
+ = MSYMBOL_SEARCH_NAME (msymbol.minsym);
+ wsym = lookup_symbol_search_name (search_name, block,
+ VAR_DOMAIN).symbol;
+ }
if (wsym)
{
block = BLOCKVECTOR_BLOCK (bv, block_loop);
if (BLOCK_FUNCTION (block) != NULL)
continue;
- gdb_val_sym = block_lookup_symbol (block, COMPILE_I_EXPR_VAL, VAR_DOMAIN);
+ gdb_val_sym = block_lookup_symbol (block,
+ COMPILE_I_EXPR_VAL,
+ symbol_name_match_type::SEARCH_NAME,
+ VAR_DOMAIN);
if (gdb_val_sym == NULL)
continue;
gdb_type = check_typedef (gdb_type);
gdb_ptr_type_sym = block_lookup_symbol (block, COMPILE_I_EXPR_PTR_TYPE,
+ symbol_name_match_type::SEARCH_NAME,
VAR_DOMAIN);
if (gdb_ptr_type_sym == NULL)
error (_("No \"%s\" symbol found"), COMPILE_I_EXPR_PTR_TYPE);
if (global_block != NULL)
{
- sym.symbol = lookup_symbol_in_block (name, global_block, domain);
+ sym.symbol = lookup_symbol_in_block (name,
+ symbol_name_match_type::FULL,
+ global_block, domain);
sym.block = global_block;
}
}
{
case symbol_name_match_type::FULL:
case symbol_name_match_type::EXPRESSION:
+ case symbol_name_match_type::SEARCH_NAME:
return cp_fq_symbol_name_matches;
case symbol_name_match_type::WILD:
return cp_symbol_name_matches;
CORE_ADDR handler;
struct breakpoint *bp;
- vsym = lookup_symbol (SYMBOL_LINKAGE_NAME (sym), b, VAR_DOMAIN, NULL);
+ vsym = lookup_symbol_search_name (SYMBOL_SEARCH_NAME (sym),
+ b, VAR_DOMAIN);
value = read_var_value (vsym.symbol, vsym.block, frame);
/* If the value was optimized out, revert to the old behavior. */
if (! value_optimized_out (value))
struct symbol *wsym = NULL;
struct type *wtype;
struct block *block = NULL;
- struct field_of_this_result is_this_fld;
if (want_space)
fputs_filtered (" ", stream);
if (msymbol.minsym != NULL)
- wsym = lookup_symbol (MSYMBOL_LINKAGE_NAME (msymbol.minsym),
- block,
- VAR_DOMAIN, &is_this_fld).symbol;
+ {
+ const char *search_name
+ = MSYMBOL_SEARCH_NAME (msymbol.minsym);
+ wsym = lookup_symbol_search_name (search_name, block,
+ VAR_DOMAIN).symbol;
+ }
if (wsym)
{
length = ps->n_static_syms;
while (length--)
{
- sym = block_lookup_symbol (b, SYMBOL_LINKAGE_NAME (*psym),
+ sym = block_lookup_symbol (b, SYMBOL_SEARCH_NAME (*psym),
+ symbol_name_match_type::SEARCH_NAME,
SYMBOL_DOMAIN (*psym));
if (!sym)
{
length = ps->n_global_syms;
while (length--)
{
- sym = block_lookup_symbol (b, SYMBOL_LINKAGE_NAME (*psym),
+ sym = block_lookup_symbol (b, SYMBOL_SEARCH_NAME (*psym),
+ symbol_name_match_type::SEARCH_NAME,
SYMBOL_DOMAIN (*psym));
if (!sym)
{
{
struct symbol *nsym;
- nsym = lookup_symbol (SYMBOL_LINKAGE_NAME (sym),
- b, VAR_DOMAIN, NULL).symbol;
+ nsym = lookup_symbol_search_name (SYMBOL_SEARCH_NAME (sym),
+ b, VAR_DOMAIN).symbol;
gdb_assert (nsym != NULL);
if (SYMBOL_CLASS (nsym) == LOC_REGISTER
&& !SYMBOL_IS_ARGUMENT (nsym))
float). There are also LOC_ARG/LOC_REGISTER pairs which
are not combined in symbol-reading. */
- sym2 = lookup_symbol (SYMBOL_LINKAGE_NAME (sym),
- b, VAR_DOMAIN, NULL).symbol;
+ sym2 = lookup_symbol_search_name (SYMBOL_SEARCH_NAME (sym),
+ b, VAR_DOMAIN).symbol;
(*cb) (SYMBOL_PRINT_NAME (sym), sym2, cb_data);
}
}
static struct block_symbol
lookup_symbol_aux (const char *name,
+ symbol_name_match_type match_type,
const struct block *block,
const domain_enum domain,
enum language language,
static
struct block_symbol lookup_local_symbol (const char *name,
+ symbol_name_match_type match_type,
const struct block *block,
const domain_enum domain,
enum language language);
if (without_params != NULL)
{
- m_demangled_name = demangle_for_lookup (without_params.get (),
- lang, storage);
+ if (lookup_name.match_type () != symbol_name_match_type::SEARCH_NAME)
+ m_demangled_name = demangle_for_lookup (without_params.get (),
+ lang, storage);
return;
}
}
- m_demangled_name = demangle_for_lookup (lookup_name.name ().c_str (),
- lang, storage);
+ if (lookup_name.match_type () == symbol_name_match_type::SEARCH_NAME)
+ m_demangled_name = lookup_name.name ();
+ else
+ m_demangled_name = demangle_for_lookup (lookup_name.name ().c_str (),
+ lang, storage);
}
/* See symtab.h. */
demangle_result_storage storage;
const char *modified_name = demangle_for_lookup (name, lang, storage);
- return lookup_symbol_aux (modified_name, block, domain, lang,
+ return lookup_symbol_aux (modified_name,
+ symbol_name_match_type::FULL,
+ block, domain, lang,
is_a_field_of_this);
}
/* See symtab.h. */
struct block_symbol
+lookup_symbol_search_name (const char *search_name, const struct block *block,
+ domain_enum domain)
+{
+ return lookup_symbol_aux (search_name, symbol_name_match_type::SEARCH_NAME,
+ block, domain, language_asm, NULL);
+}
+
+/* See symtab.h. */
+
+struct block_symbol
lookup_language_this (const struct language_defn *lang,
const struct block *block)
{
{
struct symbol *sym;
- sym = block_lookup_symbol (block, lang->la_name_of_this, VAR_DOMAIN);
+ sym = block_lookup_symbol (block, lang->la_name_of_this,
+ symbol_name_match_type::SEARCH_NAME,
+ VAR_DOMAIN);
if (sym != NULL)
{
if (symbol_lookup_debug > 1)
(e.g., demangled name) of the symbol that we're looking for. */
static struct block_symbol
-lookup_symbol_aux (const char *name, const struct block *block,
+lookup_symbol_aux (const char *name, symbol_name_match_type match_type,
+ const struct block *block,
const domain_enum domain, enum language language,
struct field_of_this_result *is_a_field_of_this)
{
/* Search specified block and its superiors. Don't search
STATIC_BLOCK or GLOBAL_BLOCK. */
- result = lookup_local_symbol (name, block, domain, language);
+ result = lookup_local_symbol (name, match_type, block, domain, language);
if (result.symbol != NULL)
{
if (symbol_lookup_debug)
Don't search STATIC_BLOCK or GLOBAL_BLOCK. */
static struct block_symbol
-lookup_local_symbol (const char *name, const struct block *block,
+lookup_local_symbol (const char *name,
+ symbol_name_match_type match_type,
+ const struct block *block,
const domain_enum domain,
enum language language)
{
while (block != static_block)
{
- sym = lookup_symbol_in_block (name, block, domain);
+ sym = lookup_symbol_in_block (name, match_type, block, domain);
if (sym != NULL)
return (struct block_symbol) {sym, block};
/* See symtab.h. */
struct symbol *
-lookup_symbol_in_block (const char *name, const struct block *block,
+lookup_symbol_in_block (const char *name, symbol_name_match_type match_type,
+ const struct block *block,
const domain_enum domain)
{
struct symbol *sym;
domain_name (domain));
}
- sym = block_lookup_symbol (block, name, domain);
+ sym = block_lookup_symbol (block, name, match_type, domain);
if (sym)
{
if (symbol_lookup_debug > 1)
bv = COMPUNIT_BLOCKVECTOR (cust);
block = BLOCKVECTOR_BLOCK (bv, block_index);
- result.symbol = block_lookup_symbol (block, name, domain);
+ result.symbol = block_lookup_symbol (block, name,
+ symbol_name_match_type::FULL, domain);
if (result.symbol == NULL)
error_in_psymtab_expansion (block_index, name, cust);
domain_name (domain));
}
- sym = lookup_symbol_in_block (name, static_block, domain);
+ sym = lookup_symbol_in_block (name,
+ symbol_name_match_type::FULL,
+ static_block, domain);
if (symbol_lookup_debug)
{
fprintf_unfiltered (gdb_stdlog,
namespace/module/package. */
FULL,
+ /* Search name matching. This is like FULL, but the search name did
+ not come from the user; instead it is already a search name
+ retrieved from a SYMBOL_SEARCH_NAME/MSYMBOL_SEARCH_NAME call.
+ For Ada, this avoids re-encoding an already-encoded search name
+ (which would potentially incorrectly lowercase letters in the
+ linkage/search name that should remain uppercase). For C++, it
+ avoids trying to demangle a name we already know is
+ demangled. */
+ SEARCH_NAME,
+
/* Expression matching. The same as FULL matching in most
languages. The same as WILD matching in Ada. */
EXPRESSION,
const domain_enum,
struct field_of_this_result *);
+/* Find the definition for a specified symbol search name in domain
+ DOMAIN, visible from lexical block BLOCK if non-NULL or from
+ global/static blocks if BLOCK is NULL. The passed-in search name
+ should not come from the user; instead it should already be a
+ search name as retrieved from a
+ SYMBOL_SEARCH_NAME/MSYMBOL_SEARCH_NAME call. See definition of
+ symbol_name_match_type::SEARCH_NAME. Returns the struct symbol
+ pointer, or NULL if no symbol is found. The symbol's section is
+ fixed up if necessary. */
+
+extern struct block_symbol lookup_symbol_search_name (const char *search_name,
+ const struct block *block,
+ domain_enum domain);
+
/* A default version of lookup_symbol_nonlocal for use by languages
that can't think of anything better to do.
This implements the C lookup rules. */
extern struct symbol *
lookup_symbol_in_block (const char *name,
+ symbol_name_match_type match_type,
const struct block *block,
const domain_enum domain);
+2018-01-05 Joel Brobecker <brobecker@adacore.com>
+
+ PR gdb/22670
+ * gdb.ada/access_tagged_param.exp: New file.
+ * gdb.ada/access_tagged_param/foo.adb: New file.
+
2018-01-05 Pedro Alves <palves@redhat.com>
PR gdb/22670
--- /dev/null
+# Copyright 2017-2018 Free Software Foundation, Inc.
+#
+# 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/>.
+
+# Check that we can print values of parameters of type 'pointer
+# (access) to tagged type'. See PR gdb/22670.
+
+load_lib "ada.exp"
+
+standard_ada_testfile foo
+
+if {[gdb_compile_ada "${srcfile}" "${binfile}" executable [list debug]] != "" } {
+ return -1
+}
+
+clean_restart ${testfile}
+
+if ![runto "foo"] then {
+ perror "Couldn't run ${testfile}"
+ return
+}
+
+gdb_breakpoint "pck.inspect"
+
+# Continue until we reach the breakpoint, and verify that we can print
+# the value of all the parameters.
+
+gdb_test "continue" \
+ ".*Breakpoint $decimal, pck\\.inspect \\(obj=$hex, <objL>=2\\) at .*"
--- /dev/null
+-- Copyright 2017-2018 Free Software Foundation, Inc.
+--
+-- 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/>.
+
+with Pck; use Pck;
+procedure Foo is
+begin
+ Inspect (new Top_T'(N => 2));
+end Foo;
--- /dev/null
+-- Copyright 2017-2018 Free Software Foundation, Inc.
+--
+-- 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/>.
+
+package body Pck is
+ procedure Inspect (Obj: access Top_T'Class) is
+ begin
+ null;
+ end Inspect;
+end Pck;
--- /dev/null
+-- Copyright 2017-2018 Free Software Foundation, Inc.
+--
+-- 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/>.
+
+package Pck is
+ type Top_T is tagged record
+ N : Integer := 1;
+ end record;
+ procedure Inspect (Obj: access Top_T'Class);
+end Pck;
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