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.
805 lines
21 KiB
C
805 lines
21 KiB
C
/* Scheme interface to blocks.
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||
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Copyright (C) 2008-2015 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
|
||
(at your option) any later version.
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||
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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
|
||
GNU General Public License for more details.
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||
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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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/* See README file in this directory for implementation notes, coding
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conventions, et.al. */
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#include "defs.h"
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#include "block.h"
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#include "dictionary.h"
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#include "objfiles.h"
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#include "source.h"
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#include "symtab.h"
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#include "guile-internal.h"
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/* A smob describing a gdb block. */
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typedef struct _block_smob
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{
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/* This always appears first.
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We want blocks to be eq?-able. And we need to be able to invalidate
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blocks when the associated objfile is deleted. */
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eqable_gdb_smob base;
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/* The GDB block structure that represents a frame's code block. */
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const struct block *block;
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/* The backing object file. There is no direct relationship in GDB
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between a block and an object file. When a block is created also
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store a pointer to the object file for later use. */
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struct objfile *objfile;
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} block_smob;
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/* To iterate over block symbols from Scheme we need to store
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struct block_iterator somewhere. This is stored in the "progress" field
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of <gdb:iterator>. We store the block object in iterator_smob.object,
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so we don't store it here.
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Remember: While iterating over block symbols, you must continually check
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whether the block is still valid. */
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typedef struct
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{
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/* This always appears first. */
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gdb_smob base;
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/* The iterator for that block. */
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struct block_iterator iter;
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/* Has the iterator been initialized flag. */
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int initialized_p;
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} block_syms_progress_smob;
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static const char block_smob_name[] = "gdb:block";
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static const char block_syms_progress_smob_name[] = "gdb:block-symbols-iterator";
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/* The tag Guile knows the block smobs by. */
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static scm_t_bits block_smob_tag;
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static scm_t_bits block_syms_progress_smob_tag;
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/* The "next!" block syms iterator method. */
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static SCM bkscm_next_symbol_x_proc;
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static const struct objfile_data *bkscm_objfile_data_key;
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/* Administrivia for block smobs. */
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/* Helper function to hash a block_smob. */
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static hashval_t
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bkscm_hash_block_smob (const void *p)
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{
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const block_smob *b_smob = p;
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return htab_hash_pointer (b_smob->block);
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}
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/* Helper function to compute equality of block_smobs. */
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static int
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bkscm_eq_block_smob (const void *ap, const void *bp)
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{
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const block_smob *a = ap;
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const block_smob *b = bp;
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return (a->block == b->block
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&& a->block != NULL);
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}
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/* Return the struct block pointer -> SCM mapping table.
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It is created if necessary. */
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static htab_t
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bkscm_objfile_block_map (struct objfile *objfile)
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{
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htab_t htab = objfile_data (objfile, bkscm_objfile_data_key);
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if (htab == NULL)
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{
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htab = gdbscm_create_eqable_gsmob_ptr_map (bkscm_hash_block_smob,
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bkscm_eq_block_smob);
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set_objfile_data (objfile, bkscm_objfile_data_key, htab);
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}
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return htab;
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}
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/* The smob "free" function for <gdb:block>. */
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static size_t
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bkscm_free_block_smob (SCM self)
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{
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block_smob *b_smob = (block_smob *) SCM_SMOB_DATA (self);
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if (b_smob->block != NULL)
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{
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htab_t htab = bkscm_objfile_block_map (b_smob->objfile);
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gdbscm_clear_eqable_gsmob_ptr_slot (htab, &b_smob->base);
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}
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/* Not necessary, done to catch bugs. */
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b_smob->block = NULL;
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b_smob->objfile = NULL;
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return 0;
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}
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/* The smob "print" function for <gdb:block>. */
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static int
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bkscm_print_block_smob (SCM self, SCM port, scm_print_state *pstate)
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{
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block_smob *b_smob = (block_smob *) SCM_SMOB_DATA (self);
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const struct block *b = b_smob->block;
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gdbscm_printf (port, "#<%s", block_smob_name);
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if (BLOCK_SUPERBLOCK (b) == NULL)
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gdbscm_printf (port, " global");
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else if (BLOCK_SUPERBLOCK (BLOCK_SUPERBLOCK (b)) == NULL)
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gdbscm_printf (port, " static");
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if (BLOCK_FUNCTION (b) != NULL)
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gdbscm_printf (port, " %s", SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)));
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gdbscm_printf (port, " %s-%s",
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hex_string (BLOCK_START (b)), hex_string (BLOCK_END (b)));
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scm_puts (">", port);
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scm_remember_upto_here_1 (self);
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/* Non-zero means success. */
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return 1;
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}
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/* Low level routine to create a <gdb:block> object. */
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static SCM
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bkscm_make_block_smob (void)
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{
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block_smob *b_smob = (block_smob *)
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scm_gc_malloc (sizeof (block_smob), block_smob_name);
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SCM b_scm;
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b_smob->block = NULL;
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b_smob->objfile = NULL;
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b_scm = scm_new_smob (block_smob_tag, (scm_t_bits) b_smob);
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gdbscm_init_eqable_gsmob (&b_smob->base, b_scm);
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return b_scm;
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}
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/* Returns non-zero if SCM is a <gdb:block> object. */
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static int
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bkscm_is_block (SCM scm)
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{
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return SCM_SMOB_PREDICATE (block_smob_tag, scm);
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}
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/* (block? scm) -> boolean */
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static SCM
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gdbscm_block_p (SCM scm)
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{
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return scm_from_bool (bkscm_is_block (scm));
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}
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/* Return the existing object that encapsulates BLOCK, or create a new
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<gdb:block> object. */
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SCM
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bkscm_scm_from_block (const struct block *block, struct objfile *objfile)
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{
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htab_t htab;
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eqable_gdb_smob **slot;
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block_smob *b_smob, b_smob_for_lookup;
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SCM b_scm;
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/* If we've already created a gsmob for this block, return it.
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This makes blocks eq?-able. */
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htab = bkscm_objfile_block_map (objfile);
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b_smob_for_lookup.block = block;
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slot = gdbscm_find_eqable_gsmob_ptr_slot (htab, &b_smob_for_lookup.base);
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if (*slot != NULL)
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return (*slot)->containing_scm;
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b_scm = bkscm_make_block_smob ();
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b_smob = (block_smob *) SCM_SMOB_DATA (b_scm);
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b_smob->block = block;
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b_smob->objfile = objfile;
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gdbscm_fill_eqable_gsmob_ptr_slot (slot, &b_smob->base);
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return b_scm;
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}
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/* Returns the <gdb:block> object in SELF.
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Throws an exception if SELF is not a <gdb:block> object. */
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static SCM
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bkscm_get_block_arg_unsafe (SCM self, int arg_pos, const char *func_name)
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{
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SCM_ASSERT_TYPE (bkscm_is_block (self), self, arg_pos, func_name,
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block_smob_name);
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return self;
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}
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/* Returns a pointer to the block smob of SELF.
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Throws an exception if SELF is not a <gdb:block> object. */
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static block_smob *
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bkscm_get_block_smob_arg_unsafe (SCM self, int arg_pos, const char *func_name)
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{
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SCM b_scm = bkscm_get_block_arg_unsafe (self, arg_pos, func_name);
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block_smob *b_smob = (block_smob *) SCM_SMOB_DATA (b_scm);
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return b_smob;
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}
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/* Returns non-zero if block B_SMOB is valid. */
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static int
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bkscm_is_valid (block_smob *b_smob)
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{
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return b_smob->block != NULL;
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}
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/* Returns the block smob in SELF, verifying it's valid.
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Throws an exception if SELF is not a <gdb:block> object or is invalid. */
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static block_smob *
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bkscm_get_valid_block_smob_arg_unsafe (SCM self, int arg_pos,
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const char *func_name)
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{
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block_smob *b_smob
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= bkscm_get_block_smob_arg_unsafe (self, arg_pos, func_name);
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if (!bkscm_is_valid (b_smob))
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{
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gdbscm_invalid_object_error (func_name, arg_pos, self,
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_("<gdb:block>"));
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}
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return b_smob;
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}
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/* Returns the block smob contained in SCM or NULL if SCM is not a
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<gdb:block> object.
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If there is an error a <gdb:exception> object is stored in *EXCP. */
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static block_smob *
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bkscm_get_valid_block (SCM scm, int arg_pos, const char *func_name, SCM *excp)
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{
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block_smob *b_smob;
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if (!bkscm_is_block (scm))
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{
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*excp = gdbscm_make_type_error (func_name, arg_pos, scm,
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block_smob_name);
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return NULL;
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}
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b_smob = (block_smob *) SCM_SMOB_DATA (scm);
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if (!bkscm_is_valid (b_smob))
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{
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*excp = gdbscm_make_invalid_object_error (func_name, arg_pos, scm,
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_("<gdb:block>"));
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return NULL;
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}
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return b_smob;
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}
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/* Returns the struct block that is wrapped by BLOCK_SCM.
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If BLOCK_SCM is not a block, or is an invalid block, then NULL is returned
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and a <gdb:exception> object is stored in *EXCP. */
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const struct block *
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bkscm_scm_to_block (SCM block_scm, int arg_pos, const char *func_name,
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SCM *excp)
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{
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block_smob *b_smob;
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b_smob = bkscm_get_valid_block (block_scm, arg_pos, func_name, excp);
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if (b_smob != NULL)
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return b_smob->block;
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return NULL;
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}
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/* Helper function for bkscm_del_objfile_blocks to mark the block
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as invalid. */
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static int
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bkscm_mark_block_invalid (void **slot, void *info)
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{
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block_smob *b_smob = (block_smob *) *slot;
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b_smob->block = NULL;
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b_smob->objfile = NULL;
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return 1;
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}
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/* This function is called when an objfile is about to be freed.
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Invalidate the block as further actions on the block would result
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in bad data. All access to b_smob->block should be gated by
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checks to ensure the block is (still) valid. */
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static void
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bkscm_del_objfile_blocks (struct objfile *objfile, void *datum)
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{
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htab_t htab = datum;
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if (htab != NULL)
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{
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htab_traverse_noresize (htab, bkscm_mark_block_invalid, NULL);
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htab_delete (htab);
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}
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}
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/* Block methods. */
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/* (block-valid? <gdb:block>) -> boolean
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Returns #t if SELF still exists in GDB. */
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static SCM
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gdbscm_block_valid_p (SCM self)
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{
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block_smob *b_smob
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= bkscm_get_block_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME);
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return scm_from_bool (bkscm_is_valid (b_smob));
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}
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/* (block-start <gdb:block>) -> address */
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static SCM
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gdbscm_block_start (SCM self)
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{
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block_smob *b_smob
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= bkscm_get_valid_block_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME);
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const struct block *block = b_smob->block;
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return gdbscm_scm_from_ulongest (BLOCK_START (block));
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}
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/* (block-end <gdb:block>) -> address */
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static SCM
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gdbscm_block_end (SCM self)
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{
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block_smob *b_smob
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= bkscm_get_valid_block_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME);
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const struct block *block = b_smob->block;
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return gdbscm_scm_from_ulongest (BLOCK_END (block));
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}
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/* (block-function <gdb:block>) -> <gdb:symbol> */
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static SCM
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gdbscm_block_function (SCM self)
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{
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block_smob *b_smob
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= bkscm_get_valid_block_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME);
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const struct block *block = b_smob->block;
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struct symbol *sym;
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sym = BLOCK_FUNCTION (block);
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|
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if (sym != NULL)
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return syscm_scm_from_symbol (sym);
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return SCM_BOOL_F;
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}
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|
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/* (block-superblock <gdb:block>) -> <gdb:block> */
|
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|
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static SCM
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gdbscm_block_superblock (SCM self)
|
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{
|
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block_smob *b_smob
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= bkscm_get_valid_block_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME);
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const struct block *block = b_smob->block;
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const struct block *super_block;
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super_block = BLOCK_SUPERBLOCK (block);
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if (super_block)
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return bkscm_scm_from_block (super_block, b_smob->objfile);
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return SCM_BOOL_F;
|
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}
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|
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/* (block-global-block <gdb:block>) -> <gdb:block>
|
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Returns the global block associated to this block. */
|
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|
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static SCM
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gdbscm_block_global_block (SCM self)
|
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{
|
||
block_smob *b_smob
|
||
= bkscm_get_valid_block_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME);
|
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const struct block *block = b_smob->block;
|
||
const struct block *global_block;
|
||
|
||
global_block = block_global_block (block);
|
||
|
||
return bkscm_scm_from_block (global_block, b_smob->objfile);
|
||
}
|
||
|
||
/* (block-static-block <gdb:block>) -> <gdb:block>
|
||
Returns the static block associated to this block.
|
||
Returns #f if we cannot get the static block (this is the global block). */
|
||
|
||
static SCM
|
||
gdbscm_block_static_block (SCM self)
|
||
{
|
||
block_smob *b_smob
|
||
= bkscm_get_valid_block_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME);
|
||
const struct block *block = b_smob->block;
|
||
const struct block *static_block;
|
||
|
||
if (BLOCK_SUPERBLOCK (block) == NULL)
|
||
return SCM_BOOL_F;
|
||
|
||
static_block = block_static_block (block);
|
||
|
||
return bkscm_scm_from_block (static_block, b_smob->objfile);
|
||
}
|
||
|
||
/* (block-global? <gdb:block>) -> boolean
|
||
Returns #t if this block object is a global block. */
|
||
|
||
static SCM
|
||
gdbscm_block_global_p (SCM self)
|
||
{
|
||
block_smob *b_smob
|
||
= bkscm_get_valid_block_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME);
|
||
const struct block *block = b_smob->block;
|
||
|
||
return scm_from_bool (BLOCK_SUPERBLOCK (block) == NULL);
|
||
}
|
||
|
||
/* (block-static? <gdb:block>) -> boolean
|
||
Returns #t if this block object is a static block. */
|
||
|
||
static SCM
|
||
gdbscm_block_static_p (SCM self)
|
||
{
|
||
block_smob *b_smob
|
||
= bkscm_get_valid_block_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME);
|
||
const struct block *block = b_smob->block;
|
||
|
||
if (BLOCK_SUPERBLOCK (block) != NULL
|
||
&& BLOCK_SUPERBLOCK (BLOCK_SUPERBLOCK (block)) == NULL)
|
||
return SCM_BOOL_T;
|
||
return SCM_BOOL_F;
|
||
}
|
||
|
||
/* (block-symbols <gdb:block>) -> list of <gdb:symbol objects
|
||
Returns a list of symbols of the block. */
|
||
|
||
static SCM
|
||
gdbscm_block_symbols (SCM self)
|
||
{
|
||
block_smob *b_smob
|
||
= bkscm_get_valid_block_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME);
|
||
const struct block *block = b_smob->block;
|
||
struct block_iterator iter;
|
||
struct symbol *sym;
|
||
SCM result;
|
||
|
||
result = SCM_EOL;
|
||
|
||
sym = block_iterator_first (block, &iter);
|
||
|
||
while (sym != NULL)
|
||
{
|
||
SCM s_scm = syscm_scm_from_symbol (sym);
|
||
|
||
result = scm_cons (s_scm, result);
|
||
sym = block_iterator_next (&iter);
|
||
}
|
||
|
||
return scm_reverse_x (result, SCM_EOL);
|
||
}
|
||
|
||
/* The <gdb:block-symbols-iterator> object,
|
||
for iterating over all symbols in a block. */
|
||
|
||
/* The smob "print" function for <gdb:block-symbols-iterator>. */
|
||
|
||
static int
|
||
bkscm_print_block_syms_progress_smob (SCM self, SCM port,
|
||
scm_print_state *pstate)
|
||
{
|
||
block_syms_progress_smob *i_smob
|
||
= (block_syms_progress_smob *) SCM_SMOB_DATA (self);
|
||
|
||
gdbscm_printf (port, "#<%s", block_syms_progress_smob_name);
|
||
|
||
if (i_smob->initialized_p)
|
||
{
|
||
switch (i_smob->iter.which)
|
||
{
|
||
case GLOBAL_BLOCK:
|
||
case STATIC_BLOCK:
|
||
{
|
||
struct compunit_symtab *cust;
|
||
|
||
gdbscm_printf (port, " %s",
|
||
i_smob->iter.which == GLOBAL_BLOCK
|
||
? "global" : "static");
|
||
if (i_smob->iter.idx != -1)
|
||
gdbscm_printf (port, " @%d", i_smob->iter.idx);
|
||
cust = (i_smob->iter.idx == -1
|
||
? i_smob->iter.d.compunit_symtab
|
||
: i_smob->iter.d.compunit_symtab->includes[i_smob->iter.idx]);
|
||
gdbscm_printf (port, " %s",
|
||
symtab_to_filename_for_display
|
||
(compunit_primary_filetab (cust)));
|
||
break;
|
||
}
|
||
case FIRST_LOCAL_BLOCK:
|
||
gdbscm_printf (port, " single block");
|
||
break;
|
||
}
|
||
}
|
||
else
|
||
gdbscm_printf (port, " !initialized");
|
||
|
||
scm_puts (">", port);
|
||
|
||
scm_remember_upto_here_1 (self);
|
||
|
||
/* Non-zero means success. */
|
||
return 1;
|
||
}
|
||
|
||
/* Low level routine to create a <gdb:block-symbols-progress> object. */
|
||
|
||
static SCM
|
||
bkscm_make_block_syms_progress_smob (void)
|
||
{
|
||
block_syms_progress_smob *i_smob = (block_syms_progress_smob *)
|
||
scm_gc_malloc (sizeof (block_syms_progress_smob),
|
||
block_syms_progress_smob_name);
|
||
SCM smob;
|
||
|
||
memset (&i_smob->iter, 0, sizeof (i_smob->iter));
|
||
i_smob->initialized_p = 0;
|
||
smob = scm_new_smob (block_syms_progress_smob_tag, (scm_t_bits) i_smob);
|
||
gdbscm_init_gsmob (&i_smob->base);
|
||
|
||
return smob;
|
||
}
|
||
|
||
/* Returns non-zero if SCM is a <gdb:block-symbols-progress> object. */
|
||
|
||
static int
|
||
bkscm_is_block_syms_progress (SCM scm)
|
||
{
|
||
return SCM_SMOB_PREDICATE (block_syms_progress_smob_tag, scm);
|
||
}
|
||
|
||
/* (block-symbols-progress? scm) -> boolean */
|
||
|
||
static SCM
|
||
bkscm_block_syms_progress_p (SCM scm)
|
||
{
|
||
return scm_from_bool (bkscm_is_block_syms_progress (scm));
|
||
}
|
||
|
||
/* (make-block-symbols-iterator <gdb:block>) -> <gdb:iterator>
|
||
Return a <gdb:iterator> object for iterating over the symbols of SELF. */
|
||
|
||
static SCM
|
||
gdbscm_make_block_syms_iter (SCM self)
|
||
{
|
||
block_smob *b_smob
|
||
= bkscm_get_valid_block_smob_arg_unsafe (self, SCM_ARG1, FUNC_NAME);
|
||
const struct block *block = b_smob->block;
|
||
SCM progress, iter;
|
||
|
||
progress = bkscm_make_block_syms_progress_smob ();
|
||
|
||
iter = gdbscm_make_iterator (self, progress, bkscm_next_symbol_x_proc);
|
||
|
||
return iter;
|
||
}
|
||
|
||
/* Returns the next symbol in the iteration through the block's dictionary,
|
||
or (end-of-iteration).
|
||
This is the iterator_smob.next_x method. */
|
||
|
||
static SCM
|
||
gdbscm_block_next_symbol_x (SCM self)
|
||
{
|
||
SCM progress, iter_scm, block_scm;
|
||
iterator_smob *iter_smob;
|
||
block_smob *b_smob;
|
||
const struct block *block;
|
||
block_syms_progress_smob *p_smob;
|
||
struct symbol *sym;
|
||
|
||
iter_scm = itscm_get_iterator_arg_unsafe (self, SCM_ARG1, FUNC_NAME);
|
||
iter_smob = (iterator_smob *) SCM_SMOB_DATA (iter_scm);
|
||
|
||
block_scm = itscm_iterator_smob_object (iter_smob);
|
||
b_smob = bkscm_get_valid_block_smob_arg_unsafe (block_scm,
|
||
SCM_ARG1, FUNC_NAME);
|
||
block = b_smob->block;
|
||
|
||
progress = itscm_iterator_smob_progress (iter_smob);
|
||
|
||
SCM_ASSERT_TYPE (bkscm_is_block_syms_progress (progress),
|
||
progress, SCM_ARG1, FUNC_NAME,
|
||
block_syms_progress_smob_name);
|
||
p_smob = (block_syms_progress_smob *) SCM_SMOB_DATA (progress);
|
||
|
||
if (!p_smob->initialized_p)
|
||
{
|
||
sym = block_iterator_first (block, &p_smob->iter);
|
||
p_smob->initialized_p = 1;
|
||
}
|
||
else
|
||
sym = block_iterator_next (&p_smob->iter);
|
||
|
||
if (sym == NULL)
|
||
return gdbscm_end_of_iteration ();
|
||
|
||
return syscm_scm_from_symbol (sym);
|
||
}
|
||
|
||
/* (lookup-block address) -> <gdb:block>
|
||
Returns the innermost lexical block containing the specified pc value,
|
||
or #f if there is none. */
|
||
|
||
static SCM
|
||
gdbscm_lookup_block (SCM pc_scm)
|
||
{
|
||
CORE_ADDR pc;
|
||
const struct block *block = NULL;
|
||
struct compunit_symtab *cust = NULL;
|
||
|
||
gdbscm_parse_function_args (FUNC_NAME, SCM_ARG1, NULL, "U", pc_scm, &pc);
|
||
|
||
TRY
|
||
{
|
||
cust = find_pc_compunit_symtab (pc);
|
||
|
||
if (cust != NULL && COMPUNIT_OBJFILE (cust) != NULL)
|
||
block = block_for_pc (pc);
|
||
}
|
||
CATCH (except, RETURN_MASK_ALL)
|
||
{
|
||
GDBSCM_HANDLE_GDB_EXCEPTION (except);
|
||
}
|
||
END_CATCH
|
||
|
||
if (cust == NULL || COMPUNIT_OBJFILE (cust) == NULL)
|
||
{
|
||
gdbscm_out_of_range_error (FUNC_NAME, SCM_ARG1, pc_scm,
|
||
_("cannot locate object file for block"));
|
||
}
|
||
|
||
if (block != NULL)
|
||
return bkscm_scm_from_block (block, COMPUNIT_OBJFILE (cust));
|
||
return SCM_BOOL_F;
|
||
}
|
||
|
||
/* Initialize the Scheme block support. */
|
||
|
||
static const scheme_function block_functions[] =
|
||
{
|
||
{ "block?", 1, 0, 0, gdbscm_block_p,
|
||
"\
|
||
Return #t if the object is a <gdb:block> object." },
|
||
|
||
{ "block-valid?", 1, 0, 0, gdbscm_block_valid_p,
|
||
"\
|
||
Return #t if the block is valid.\n\
|
||
A block becomes invalid when its objfile is freed." },
|
||
|
||
{ "block-start", 1, 0, 0, gdbscm_block_start,
|
||
"\
|
||
Return the start address of the block." },
|
||
|
||
{ "block-end", 1, 0, 0, gdbscm_block_end,
|
||
"\
|
||
Return the end address of the block." },
|
||
|
||
{ "block-function", 1, 0, 0, gdbscm_block_function,
|
||
"\
|
||
Return the gdb:symbol object of the function containing the block\n\
|
||
or #f if the block does not live in any function." },
|
||
|
||
{ "block-superblock", 1, 0, 0, gdbscm_block_superblock,
|
||
"\
|
||
Return the superblock (parent block) of the block." },
|
||
|
||
{ "block-global-block", 1, 0, 0, gdbscm_block_global_block,
|
||
"\
|
||
Return the global block of the block." },
|
||
|
||
{ "block-static-block", 1, 0, 0, gdbscm_block_static_block,
|
||
"\
|
||
Return the static block of the block." },
|
||
|
||
{ "block-global?", 1, 0, 0, gdbscm_block_global_p,
|
||
"\
|
||
Return #t if block is a global block." },
|
||
|
||
{ "block-static?", 1, 0, 0, gdbscm_block_static_p,
|
||
"\
|
||
Return #t if block is a static block." },
|
||
|
||
{ "block-symbols", 1, 0, 0, gdbscm_block_symbols,
|
||
"\
|
||
Return a list of all symbols (as <gdb:symbol> objects) in the block." },
|
||
|
||
{ "make-block-symbols-iterator", 1, 0, 0, gdbscm_make_block_syms_iter,
|
||
"\
|
||
Return a <gdb:iterator> object for iterating over all symbols in the block." },
|
||
|
||
{ "block-symbols-progress?", 1, 0, 0, bkscm_block_syms_progress_p,
|
||
"\
|
||
Return #t if the object is a <gdb:block-symbols-progress> object." },
|
||
|
||
{ "lookup-block", 1, 0, 0, gdbscm_lookup_block,
|
||
"\
|
||
Return the innermost GDB block containing the address or #f if none found.\n\
|
||
\n\
|
||
Arguments:\n\
|
||
address: the address to lookup" },
|
||
|
||
END_FUNCTIONS
|
||
};
|
||
|
||
void
|
||
gdbscm_initialize_blocks (void)
|
||
{
|
||
block_smob_tag
|
||
= gdbscm_make_smob_type (block_smob_name, sizeof (block_smob));
|
||
scm_set_smob_free (block_smob_tag, bkscm_free_block_smob);
|
||
scm_set_smob_print (block_smob_tag, bkscm_print_block_smob);
|
||
|
||
block_syms_progress_smob_tag
|
||
= gdbscm_make_smob_type (block_syms_progress_smob_name,
|
||
sizeof (block_syms_progress_smob));
|
||
scm_set_smob_print (block_syms_progress_smob_tag,
|
||
bkscm_print_block_syms_progress_smob);
|
||
|
||
gdbscm_define_functions (block_functions, 1);
|
||
|
||
/* This function is "private". */
|
||
bkscm_next_symbol_x_proc
|
||
= scm_c_define_gsubr ("%block-next-symbol!", 1, 0, 0,
|
||
gdbscm_block_next_symbol_x);
|
||
scm_set_procedure_property_x (bkscm_next_symbol_x_proc,
|
||
gdbscm_documentation_symbol,
|
||
gdbscm_scm_from_c_string ("\
|
||
Internal function to assist the block symbols iterator."));
|
||
|
||
/* Register an objfile "free" callback so we can properly
|
||
invalidate blocks when an object file is about to be deleted. */
|
||
bkscm_objfile_data_key
|
||
= register_objfile_data_with_cleanup (NULL, bkscm_del_objfile_blocks);
|
||
}
|