492d29ea1c
This patch splits the TRY_CATCH macro into three, so that we go from
this:
~~~
volatile gdb_exception ex;
TRY_CATCH (ex, RETURN_MASK_ERROR)
{
}
if (ex.reason < 0)
{
}
~~~
to this:
~~~
TRY
{
}
CATCH (ex, RETURN_MASK_ERROR)
{
}
END_CATCH
~~~
Thus, we'll be getting rid of the local volatile exception object, and
declaring the caught exception in the catch block.
This allows reimplementing TRY/CATCH in terms of C++ exceptions when
building in C++ mode, while still allowing to build GDB in C mode
(using setjmp/longjmp), as a transition step.
TBC, after this patch, is it _not_ valid to have code between the TRY
and the CATCH blocks, like:
TRY
{
}
// some code here.
CATCH (ex, RETURN_MASK_ERROR)
{
}
END_CATCH
Just like it isn't valid to do that with C++'s native try/catch.
By switching to creating the exception object inside the CATCH block
scope, we can get rid of all the explicitly allocated volatile
exception objects all over the tree, and map the CATCH block more
directly to C++'s catch blocks.
The majority of the TRY_CATCH -> TRY+CATCH+END_CATCH conversion was
done with a script, rerun from scratch at every rebase, no manual
editing involved. After the mechanical conversion, a few places
needed manual intervention, to fix preexisting cases where we were
using the exception object outside of the TRY_CATCH block, and cases
where we were using "else" after a 'if (ex.reason) < 0)' [a CATCH
after this patch]. The result was folded into this patch so that GDB
still builds at each incremental step.
END_CATCH is necessary for two reasons:
First, because we name the exception object in the CATCH block, which
requires creating a scope, which in turn must be closed somewhere.
Declaring the exception variable in the initializer field of a for
block, like:
#define CATCH(EXCEPTION, mask) \
for (struct gdb_exception EXCEPTION; \
exceptions_state_mc_catch (&EXCEPTION, MASK); \
EXCEPTION = exception_none)
would avoid needing END_CATCH, but alas, in C mode, we build with C90,
which doesn't allow mixed declarations and code.
Second, because when TRY/CATCH are wired to real C++ try/catch, as
long as we need to handle cleanup chains, even if there's no CATCH
block that wants to catch the exception, we need for stop at every
frame in the unwind chain and run cleanups, then rethrow. That will
be done in END_CATCH.
After we require C++, we'll still need TRY/CATCH/END_CATCH until
cleanups are completely phased out -- TRY/CATCH in C++ mode will
save/restore the current cleanup chain, like in C mode, and END_CATCH
catches otherwise uncaugh exceptions, runs cleanups and rethrows, so
that C++ cleanups and exceptions can coexist.
IMO, this still makes the TRY/CATCH code look a bit more like a
newcomer would expect, so IMO worth it even if we weren't considering
C++.
gdb/ChangeLog.
2015-03-07 Pedro Alves <palves@redhat.com>
* common/common-exceptions.c (struct catcher) <exception>: No
longer a pointer to volatile exception. Now an exception value.
<mask>: Delete field.
(exceptions_state_mc_init): Remove all parameters. Adjust.
(exceptions_state_mc): No longer pop the catcher here.
(exceptions_state_mc_catch): New function.
(throw_exception): Adjust.
* common/common-exceptions.h (exceptions_state_mc_init): Remove
all parameters.
(exceptions_state_mc_catch): Declare.
(TRY_CATCH): Rename to ...
(TRY): ... this. Remove EXCEPTION and MASK parameters.
(CATCH, END_CATCH): New.
All callers adjusted.
gdb/gdbserver/ChangeLog:
2015-03-07 Pedro Alves <palves@redhat.com>
Adjust all callers of TRY_CATCH to use TRY/CATCH/END_CATCH
instead.
728 lines
18 KiB
C
728 lines
18 KiB
C
/* Language independent support for printing types for GDB, the GNU debugger.
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Copyright (C) 1986-2015 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "gdb_obstack.h"
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#include "bfd.h" /* Binary File Description */
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#include "symtab.h"
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#include "gdbtypes.h"
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#include "expression.h"
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#include "value.h"
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#include "gdbcore.h"
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#include "command.h"
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#include "gdbcmd.h"
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#include "target.h"
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#include "language.h"
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#include "cp-abi.h"
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#include "typeprint.h"
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#include "valprint.h"
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#include <ctype.h>
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#include "cli/cli-utils.h"
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#include "extension.h"
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#include "completer.h"
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extern void _initialize_typeprint (void);
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static void ptype_command (char *, int);
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static void whatis_command (char *, int);
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static void whatis_exp (char *, int);
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const struct type_print_options type_print_raw_options =
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{
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1, /* raw */
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1, /* print_methods */
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1, /* print_typedefs */
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NULL, /* local_typedefs */
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NULL, /* global_table */
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NULL /* global_printers */
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};
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/* The default flags for 'ptype' and 'whatis'. */
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static struct type_print_options default_ptype_flags =
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{
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0, /* raw */
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1, /* print_methods */
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1, /* print_typedefs */
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NULL, /* local_typedefs */
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NULL, /* global_table */
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NULL /* global_printers */
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};
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/* A hash table holding typedef_field objects. This is more
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complicated than an ordinary hash because it must also track the
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lifetime of some -- but not all -- of the contained objects. */
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struct typedef_hash_table
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{
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/* The actual hash table. */
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htab_t table;
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/* Storage for typedef_field objects that must be synthesized. */
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struct obstack storage;
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};
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/* A hash function for a typedef_field. */
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static hashval_t
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hash_typedef_field (const void *p)
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{
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const struct typedef_field *tf = p;
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struct type *t = check_typedef (tf->type);
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return htab_hash_string (TYPE_SAFE_NAME (t));
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}
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/* An equality function for a typedef field. */
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static int
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eq_typedef_field (const void *a, const void *b)
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{
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const struct typedef_field *tfa = a;
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const struct typedef_field *tfb = b;
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return types_equal (tfa->type, tfb->type);
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}
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/* Add typedefs from T to the hash table TABLE. */
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void
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recursively_update_typedef_hash (struct typedef_hash_table *table,
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struct type *t)
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{
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int i;
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if (table == NULL)
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return;
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for (i = 0; i < TYPE_TYPEDEF_FIELD_COUNT (t); ++i)
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{
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struct typedef_field *tdef = &TYPE_TYPEDEF_FIELD (t, i);
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void **slot;
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slot = htab_find_slot (table->table, tdef, INSERT);
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/* Only add a given typedef name once. Really this shouldn't
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happen; but it is safe enough to do the updates breadth-first
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and thus use the most specific typedef. */
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if (*slot == NULL)
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*slot = tdef;
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}
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/* Recurse into superclasses. */
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for (i = 0; i < TYPE_N_BASECLASSES (t); ++i)
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recursively_update_typedef_hash (table, TYPE_BASECLASS (t, i));
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}
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/* Add template parameters from T to the typedef hash TABLE. */
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void
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add_template_parameters (struct typedef_hash_table *table, struct type *t)
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{
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int i;
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if (table == NULL)
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return;
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for (i = 0; i < TYPE_N_TEMPLATE_ARGUMENTS (t); ++i)
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{
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struct typedef_field *tf;
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void **slot;
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/* We only want type-valued template parameters in the hash. */
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if (SYMBOL_CLASS (TYPE_TEMPLATE_ARGUMENT (t, i)) != LOC_TYPEDEF)
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continue;
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tf = XOBNEW (&table->storage, struct typedef_field);
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tf->name = SYMBOL_LINKAGE_NAME (TYPE_TEMPLATE_ARGUMENT (t, i));
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tf->type = SYMBOL_TYPE (TYPE_TEMPLATE_ARGUMENT (t, i));
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slot = htab_find_slot (table->table, tf, INSERT);
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if (*slot == NULL)
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*slot = tf;
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}
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}
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/* Create a new typedef-lookup hash table. */
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struct typedef_hash_table *
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create_typedef_hash (void)
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{
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struct typedef_hash_table *result;
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result = XNEW (struct typedef_hash_table);
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result->table = htab_create_alloc (10, hash_typedef_field, eq_typedef_field,
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NULL, xcalloc, xfree);
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obstack_init (&result->storage);
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return result;
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}
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/* Free a typedef field table. */
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void
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free_typedef_hash (struct typedef_hash_table *table)
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{
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if (table != NULL)
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{
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htab_delete (table->table);
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obstack_free (&table->storage, NULL);
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xfree (table);
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}
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}
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/* A cleanup for freeing a typedef_hash_table. */
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static void
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do_free_typedef_hash (void *arg)
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{
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free_typedef_hash (arg);
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}
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/* Return a new cleanup that frees TABLE. */
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struct cleanup *
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make_cleanup_free_typedef_hash (struct typedef_hash_table *table)
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{
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return make_cleanup (do_free_typedef_hash, table);
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}
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/* Helper function for copy_typedef_hash. */
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static int
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copy_typedef_hash_element (void **slot, void *nt)
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{
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htab_t new_table = nt;
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void **new_slot;
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new_slot = htab_find_slot (new_table, *slot, INSERT);
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if (*new_slot == NULL)
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*new_slot = *slot;
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return 1;
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}
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/* Copy a typedef hash. */
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struct typedef_hash_table *
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copy_typedef_hash (struct typedef_hash_table *table)
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{
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struct typedef_hash_table *result;
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if (table == NULL)
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return NULL;
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result = create_typedef_hash ();
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htab_traverse_noresize (table->table, copy_typedef_hash_element,
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result->table);
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return result;
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}
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/* A cleanup to free the global typedef hash. */
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static void
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do_free_global_table (void *arg)
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{
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struct type_print_options *flags = arg;
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free_typedef_hash (flags->global_typedefs);
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free_ext_lang_type_printers (flags->global_printers);
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}
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/* Create the global typedef hash. */
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static struct cleanup *
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create_global_typedef_table (struct type_print_options *flags)
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{
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gdb_assert (flags->global_typedefs == NULL && flags->global_printers == NULL);
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flags->global_typedefs = create_typedef_hash ();
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flags->global_printers = start_ext_lang_type_printers ();
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return make_cleanup (do_free_global_table, flags);
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}
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/* Look up the type T in the global typedef hash. If it is found,
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return the typedef name. If it is not found, apply the
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type-printers, if any, given by start_script_type_printers and return the
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result. A NULL return means that the name was not found. */
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static const char *
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find_global_typedef (const struct type_print_options *flags,
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struct type *t)
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{
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char *applied;
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void **slot;
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struct typedef_field tf, *new_tf;
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if (flags->global_typedefs == NULL)
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return NULL;
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tf.name = NULL;
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tf.type = t;
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slot = htab_find_slot (flags->global_typedefs->table, &tf, INSERT);
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if (*slot != NULL)
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{
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new_tf = *slot;
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return new_tf->name;
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}
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/* Put an entry into the hash table now, in case
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apply_ext_lang_type_printers recurses. */
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new_tf = XOBNEW (&flags->global_typedefs->storage, struct typedef_field);
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new_tf->name = NULL;
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new_tf->type = t;
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*slot = new_tf;
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applied = apply_ext_lang_type_printers (flags->global_printers, t);
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if (applied != NULL)
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{
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new_tf->name = obstack_copy0 (&flags->global_typedefs->storage, applied,
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strlen (applied));
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xfree (applied);
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}
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return new_tf->name;
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}
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/* Look up the type T in the typedef hash table in with FLAGS. If T
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is in the table, return its short (class-relative) typedef name.
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Otherwise return NULL. If the table is NULL, this always returns
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NULL. */
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const char *
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find_typedef_in_hash (const struct type_print_options *flags, struct type *t)
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{
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if (flags->local_typedefs != NULL)
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{
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struct typedef_field tf, *found;
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tf.name = NULL;
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tf.type = t;
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found = htab_find (flags->local_typedefs->table, &tf);
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if (found != NULL)
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return found->name;
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}
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return find_global_typedef (flags, t);
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}
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/* Print a description of a type in the format of a
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typedef for the current language.
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NEW is the new name for a type TYPE. */
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void
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typedef_print (struct type *type, struct symbol *newobj, struct ui_file *stream)
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{
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LA_PRINT_TYPEDEF (type, newobj, stream);
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}
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/* The default way to print a typedef. */
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void
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default_print_typedef (struct type *type, struct symbol *new_symbol,
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struct ui_file *stream)
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{
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error (_("Language not supported."));
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}
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/* Print a description of a type TYPE in the form of a declaration of a
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variable named VARSTRING. (VARSTRING is demangled if necessary.)
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Output goes to STREAM (via stdio).
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If SHOW is positive, we show the contents of the outermost level
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of structure even if there is a type name that could be used instead.
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If SHOW is negative, we never show the details of elements' types. */
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void
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type_print (struct type *type, const char *varstring, struct ui_file *stream,
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int show)
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{
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LA_PRINT_TYPE (type, varstring, stream, show, 0, &default_ptype_flags);
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}
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/* Print TYPE to a string, returning it. The caller is responsible for
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freeing the string. */
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char *
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type_to_string (struct type *type)
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{
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char *s = NULL;
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struct ui_file *stb;
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struct cleanup *old_chain;
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stb = mem_fileopen ();
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old_chain = make_cleanup_ui_file_delete (stb);
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TRY
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{
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type_print (type, "", stb, -1);
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s = ui_file_xstrdup (stb, NULL);
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}
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CATCH (except, RETURN_MASK_ALL)
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{
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s = NULL;
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}
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END_CATCH
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do_cleanups (old_chain);
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return s;
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}
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/* Print type of EXP, or last thing in value history if EXP == NULL.
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show is passed to type_print. */
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static void
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whatis_exp (char *exp, int show)
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{
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struct expression *expr;
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struct value *val;
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struct cleanup *old_chain;
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struct type *real_type = NULL;
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struct type *type;
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int full = 0;
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int top = -1;
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int using_enc = 0;
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struct value_print_options opts;
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struct type_print_options flags = default_ptype_flags;
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old_chain = make_cleanup (null_cleanup, NULL);
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if (exp)
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{
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if (*exp == '/')
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{
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int seen_one = 0;
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for (++exp; *exp && !isspace (*exp); ++exp)
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{
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switch (*exp)
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{
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case 'r':
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flags.raw = 1;
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break;
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case 'm':
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flags.print_methods = 0;
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break;
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case 'M':
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flags.print_methods = 1;
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break;
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case 't':
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flags.print_typedefs = 0;
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break;
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case 'T':
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flags.print_typedefs = 1;
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break;
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default:
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error (_("unrecognized flag '%c'"), *exp);
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}
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seen_one = 1;
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}
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if (!*exp && !seen_one)
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error (_("flag expected"));
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if (!isspace (*exp))
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error (_("expected space after format"));
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exp = skip_spaces (exp);
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}
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expr = parse_expression (exp);
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make_cleanup (free_current_contents, &expr);
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val = evaluate_type (expr);
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}
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else
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val = access_value_history (0);
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type = value_type (val);
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get_user_print_options (&opts);
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if (opts.objectprint)
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{
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if (((TYPE_CODE (type) == TYPE_CODE_PTR)
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|| (TYPE_CODE (type) == TYPE_CODE_REF))
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&& (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_STRUCT))
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real_type = value_rtti_indirect_type (val, &full, &top, &using_enc);
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else if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
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real_type = value_rtti_type (val, &full, &top, &using_enc);
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}
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printf_filtered ("type = ");
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|
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if (!flags.raw)
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create_global_typedef_table (&flags);
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|
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if (real_type)
|
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{
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printf_filtered ("/* real type = ");
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type_print (real_type, "", gdb_stdout, -1);
|
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if (! full)
|
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printf_filtered (" (incomplete object)");
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printf_filtered (" */\n");
|
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}
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|
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LA_PRINT_TYPE (type, "", gdb_stdout, show, 0, &flags);
|
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printf_filtered ("\n");
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do_cleanups (old_chain);
|
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}
|
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|
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static void
|
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whatis_command (char *exp, int from_tty)
|
||
{
|
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/* Most of the time users do not want to see all the fields
|
||
in a structure. If they do they can use the "ptype" command.
|
||
Hence the "-1" below. */
|
||
whatis_exp (exp, -1);
|
||
}
|
||
|
||
/* TYPENAME is either the name of a type, or an expression. */
|
||
|
||
static void
|
||
ptype_command (char *type_name, int from_tty)
|
||
{
|
||
whatis_exp (type_name, 1);
|
||
}
|
||
|
||
/* Print integral scalar data VAL, of type TYPE, onto stdio stream STREAM.
|
||
Used to print data from type structures in a specified type. For example,
|
||
array bounds may be characters or booleans in some languages, and this
|
||
allows the ranges to be printed in their "natural" form rather than as
|
||
decimal integer values.
|
||
|
||
FIXME: This is here simply because only the type printing routines
|
||
currently use it, and it wasn't clear if it really belonged somewhere
|
||
else (like printcmd.c). There are a lot of other gdb routines that do
|
||
something similar, but they are generally concerned with printing values
|
||
that come from the inferior in target byte order and target size. */
|
||
|
||
void
|
||
print_type_scalar (struct type *type, LONGEST val, struct ui_file *stream)
|
||
{
|
||
unsigned int i;
|
||
unsigned len;
|
||
|
||
CHECK_TYPEDEF (type);
|
||
|
||
switch (TYPE_CODE (type))
|
||
{
|
||
|
||
case TYPE_CODE_ENUM:
|
||
len = TYPE_NFIELDS (type);
|
||
for (i = 0; i < len; i++)
|
||
{
|
||
if (TYPE_FIELD_ENUMVAL (type, i) == val)
|
||
{
|
||
break;
|
||
}
|
||
}
|
||
if (i < len)
|
||
{
|
||
fputs_filtered (TYPE_FIELD_NAME (type, i), stream);
|
||
}
|
||
else
|
||
{
|
||
print_longest (stream, 'd', 0, val);
|
||
}
|
||
break;
|
||
|
||
case TYPE_CODE_INT:
|
||
print_longest (stream, TYPE_UNSIGNED (type) ? 'u' : 'd', 0, val);
|
||
break;
|
||
|
||
case TYPE_CODE_CHAR:
|
||
LA_PRINT_CHAR ((unsigned char) val, type, stream);
|
||
break;
|
||
|
||
case TYPE_CODE_BOOL:
|
||
fprintf_filtered (stream, val ? "TRUE" : "FALSE");
|
||
break;
|
||
|
||
case TYPE_CODE_RANGE:
|
||
print_type_scalar (TYPE_TARGET_TYPE (type), val, stream);
|
||
return;
|
||
|
||
case TYPE_CODE_UNDEF:
|
||
case TYPE_CODE_PTR:
|
||
case TYPE_CODE_ARRAY:
|
||
case TYPE_CODE_STRUCT:
|
||
case TYPE_CODE_UNION:
|
||
case TYPE_CODE_FUNC:
|
||
case TYPE_CODE_FLT:
|
||
case TYPE_CODE_VOID:
|
||
case TYPE_CODE_SET:
|
||
case TYPE_CODE_STRING:
|
||
case TYPE_CODE_ERROR:
|
||
case TYPE_CODE_MEMBERPTR:
|
||
case TYPE_CODE_METHODPTR:
|
||
case TYPE_CODE_METHOD:
|
||
case TYPE_CODE_REF:
|
||
case TYPE_CODE_NAMESPACE:
|
||
error (_("internal error: unhandled type in print_type_scalar"));
|
||
break;
|
||
|
||
default:
|
||
error (_("Invalid type code in symbol table."));
|
||
}
|
||
gdb_flush (stream);
|
||
}
|
||
|
||
/* Dump details of a type specified either directly or indirectly.
|
||
Uses the same sort of type lookup mechanism as ptype_command()
|
||
and whatis_command(). */
|
||
|
||
void
|
||
maintenance_print_type (char *type_name, int from_tty)
|
||
{
|
||
struct value *val;
|
||
struct type *type;
|
||
struct cleanup *old_chain;
|
||
struct expression *expr;
|
||
|
||
if (type_name != NULL)
|
||
{
|
||
expr = parse_expression (type_name);
|
||
old_chain = make_cleanup (free_current_contents, &expr);
|
||
if (expr->elts[0].opcode == OP_TYPE)
|
||
{
|
||
/* The user expression names a type directly, just use that type. */
|
||
type = expr->elts[1].type;
|
||
}
|
||
else
|
||
{
|
||
/* The user expression may name a type indirectly by naming an
|
||
object of that type. Find that indirectly named type. */
|
||
val = evaluate_type (expr);
|
||
type = value_type (val);
|
||
}
|
||
if (type != NULL)
|
||
{
|
||
recursive_dump_type (type, 0);
|
||
}
|
||
do_cleanups (old_chain);
|
||
}
|
||
}
|
||
|
||
|
||
struct cmd_list_element *setprinttypelist;
|
||
|
||
struct cmd_list_element *showprinttypelist;
|
||
|
||
static void
|
||
set_print_type (char *arg, int from_tty)
|
||
{
|
||
printf_unfiltered (
|
||
"\"set print type\" must be followed by the name of a subcommand.\n");
|
||
help_list (setprintlist, "set print type ", all_commands, gdb_stdout);
|
||
}
|
||
|
||
static void
|
||
show_print_type (char *args, int from_tty)
|
||
{
|
||
cmd_show_list (showprinttypelist, from_tty, "");
|
||
}
|
||
|
||
static int print_methods = 1;
|
||
|
||
static void
|
||
set_print_type_methods (char *args, int from_tty, struct cmd_list_element *c)
|
||
{
|
||
default_ptype_flags.print_methods = print_methods;
|
||
}
|
||
|
||
static void
|
||
show_print_type_methods (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
fprintf_filtered (file, _("Printing of methods defined in a class in %s\n"),
|
||
value);
|
||
}
|
||
|
||
static int print_typedefs = 1;
|
||
|
||
static void
|
||
set_print_type_typedefs (char *args, int from_tty, struct cmd_list_element *c)
|
||
{
|
||
default_ptype_flags.print_typedefs = print_typedefs;
|
||
}
|
||
|
||
static void
|
||
show_print_type_typedefs (struct ui_file *file, int from_tty,
|
||
struct cmd_list_element *c, const char *value)
|
||
{
|
||
fprintf_filtered (file, _("Printing of typedefs defined in a class in %s\n"),
|
||
value);
|
||
}
|
||
|
||
void
|
||
_initialize_typeprint (void)
|
||
{
|
||
struct cmd_list_element *c;
|
||
|
||
c = add_com ("ptype", class_vars, ptype_command, _("\
|
||
Print definition of type TYPE.\n\
|
||
Usage: ptype[/FLAGS] TYPE | EXPRESSION\n\
|
||
Argument may be any type (for example a type name defined by typedef,\n\
|
||
or \"struct STRUCT-TAG\" or \"class CLASS-NAME\" or \"union UNION-TAG\"\n\
|
||
or \"enum ENUM-TAG\") or an expression.\n\
|
||
The selected stack frame's lexical context is used to look up the name.\n\
|
||
Contrary to \"whatis\", \"ptype\" always unrolls any typedefs.\n\
|
||
\n\
|
||
Available FLAGS are:\n\
|
||
/r print in \"raw\" form; do not substitute typedefs\n\
|
||
/m do not print methods defined in a class\n\
|
||
/M print methods defined in a class\n\
|
||
/t do not print typedefs defined in a class\n\
|
||
/T print typedefs defined in a class"));
|
||
set_cmd_completer (c, expression_completer);
|
||
|
||
c = add_com ("whatis", class_vars, whatis_command,
|
||
_("Print data type of expression EXP.\n\
|
||
Only one level of typedefs is unrolled. See also \"ptype\"."));
|
||
set_cmd_completer (c, expression_completer);
|
||
|
||
add_prefix_cmd ("type", no_class, show_print_type,
|
||
_("Generic command for showing type-printing settings."),
|
||
&showprinttypelist, "show print type ", 0, &showprintlist);
|
||
add_prefix_cmd ("type", no_class, set_print_type,
|
||
_("Generic command for setting how types print."),
|
||
&setprinttypelist, "show print type ", 0, &setprintlist);
|
||
|
||
add_setshow_boolean_cmd ("methods", no_class, &print_methods,
|
||
_("\
|
||
Set printing of methods defined in classes."), _("\
|
||
Show printing of methods defined in classes."), NULL,
|
||
set_print_type_methods,
|
||
show_print_type_methods,
|
||
&setprinttypelist, &showprinttypelist);
|
||
add_setshow_boolean_cmd ("typedefs", no_class, &print_typedefs,
|
||
_("\
|
||
Set printing of typedefs defined in classes."), _("\
|
||
Show printing of typedefs defined in classes."), NULL,
|
||
set_print_type_typedefs,
|
||
show_print_type_typedefs,
|
||
&setprinttypelist, &showprinttypelist);
|
||
}
|