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366 lines
10 KiB
C
366 lines
10 KiB
C
/* Scheme interface to lazy strings.
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Copyright (C) 2010-2016 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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/* 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 "charset.h"
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#include "value.h"
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#include "valprint.h"
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#include "language.h"
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#include "guile-internal.h"
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/* The <gdb:lazy-string> smob. */
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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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/* Holds the address of the lazy string. */
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CORE_ADDR address;
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/* Holds the encoding that will be applied to the string when the string
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is printed by GDB. If the encoding is set to NULL then GDB will select
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the most appropriate encoding when the sting is printed.
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Space for this is malloc'd and will be freed when the object is
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freed. */
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char *encoding;
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/* Holds the length of the string in characters. If the length is -1,
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then the string will be fetched and encoded up to the first null of
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appropriate width. */
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int length;
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/* This attribute holds the type that is represented by the lazy
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string's type. */
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struct type *type;
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} lazy_string_smob;
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static const char lazy_string_smob_name[] = "gdb:lazy-string";
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/* The tag Guile knows the lazy string smob by. */
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static scm_t_bits lazy_string_smob_tag;
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/* Administrivia for lazy string smobs. */
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/* The smob "free" function for <gdb:lazy-string>. */
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static size_t
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lsscm_free_lazy_string_smob (SCM self)
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{
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lazy_string_smob *v_smob = (lazy_string_smob *) SCM_SMOB_DATA (self);
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xfree (v_smob->encoding);
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return 0;
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}
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/* The smob "print" function for <gdb:lazy-string>. */
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static int
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lsscm_print_lazy_string_smob (SCM self, SCM port, scm_print_state *pstate)
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{
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lazy_string_smob *ls_smob = (lazy_string_smob *) SCM_SMOB_DATA (self);
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gdbscm_printf (port, "#<%s", lazy_string_smob_name);
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gdbscm_printf (port, " @%s", hex_string (ls_smob->address));
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if (ls_smob->length >= 0)
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gdbscm_printf (port, " length %d", ls_smob->length);
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if (ls_smob->encoding != NULL)
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gdbscm_printf (port, " encoding %s", ls_smob->encoding);
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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:lazy-string> object.
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The caller must verify !(address == 0 && length != 0). */
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static SCM
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lsscm_make_lazy_string_smob (CORE_ADDR address, int length,
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const char *encoding, struct type *type)
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{
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lazy_string_smob *ls_smob = (lazy_string_smob *)
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scm_gc_malloc (sizeof (lazy_string_smob), lazy_string_smob_name);
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SCM ls_scm;
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/* Caller must verify this. */
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gdb_assert (!(address == 0 && length != 0));
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gdb_assert (type != NULL);
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ls_smob->address = address;
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/* Coerce all values < 0 to -1. */
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ls_smob->length = length < 0 ? -1 : length;
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if (encoding == NULL || strcmp (encoding, "") == 0)
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ls_smob->encoding = NULL;
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else
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ls_smob->encoding = xstrdup (encoding);
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ls_smob->type = type;
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ls_scm = scm_new_smob (lazy_string_smob_tag, (scm_t_bits) ls_smob);
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gdbscm_init_gsmob (&ls_smob->base);
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return ls_scm;
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}
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/* Return non-zero if SCM is a <gdb:lazy-string> object. */
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int
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lsscm_is_lazy_string (SCM scm)
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{
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return SCM_SMOB_PREDICATE (lazy_string_smob_tag, scm);
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}
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/* (lazy-string? object) -> boolean */
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static SCM
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gdbscm_lazy_string_p (SCM scm)
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{
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return scm_from_bool (lsscm_is_lazy_string (scm));
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}
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/* Main entry point to create a <gdb:lazy-string> object.
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If there's an error a <gdb:exception> object is returned. */
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SCM
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lsscm_make_lazy_string (CORE_ADDR address, int length,
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const char *encoding, struct type *type)
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{
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if (address == 0 && length != 0)
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{
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return gdbscm_make_out_of_range_error
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(NULL, 0, scm_from_int (length),
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_("cannot create a lazy string with address 0x0"
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" and a non-zero length"));
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}
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if (type == NULL)
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{
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return gdbscm_make_out_of_range_error
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(NULL, 0, scm_from_int (0), _("a lazy string's type cannot be NULL"));
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}
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return lsscm_make_lazy_string_smob (address, length, encoding, type);
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}
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/* Returns the <gdb:lazy-string> smob in SELF.
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Throws an exception if SELF is not a <gdb:lazy-string> object. */
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static SCM
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lsscm_get_lazy_string_arg_unsafe (SCM self, int arg_pos, const char *func_name)
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{
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SCM_ASSERT_TYPE (lsscm_is_lazy_string (self), self, arg_pos, func_name,
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lazy_string_smob_name);
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return self;
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}
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/* Lazy string methods. */
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/* (lazy-string-address <gdb:lazy-string>) -> address */
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static SCM
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gdbscm_lazy_string_address (SCM self)
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{
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SCM ls_scm = lsscm_get_lazy_string_arg_unsafe (self, SCM_ARG1, FUNC_NAME);
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lazy_string_smob *ls_smob = (lazy_string_smob *) SCM_SMOB_DATA (ls_scm);
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return gdbscm_scm_from_ulongest (ls_smob->address);
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}
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/* (lazy-string-length <gdb:lazy-string>) -> integer */
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static SCM
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gdbscm_lazy_string_length (SCM self)
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{
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SCM ls_scm = lsscm_get_lazy_string_arg_unsafe (self, SCM_ARG1, FUNC_NAME);
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lazy_string_smob *ls_smob = (lazy_string_smob *) SCM_SMOB_DATA (ls_scm);
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return scm_from_int (ls_smob->length);
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}
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/* (lazy-string-encoding <gdb:lazy-string>) -> string */
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static SCM
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gdbscm_lazy_string_encoding (SCM self)
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{
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SCM ls_scm = lsscm_get_lazy_string_arg_unsafe (self, SCM_ARG1, FUNC_NAME);
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lazy_string_smob *ls_smob = (lazy_string_smob *) SCM_SMOB_DATA (ls_scm);
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/* An encoding can be set to NULL by the user, so check first.
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If NULL return #f. */
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if (ls_smob != NULL)
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return gdbscm_scm_from_c_string (ls_smob->encoding);
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return SCM_BOOL_F;
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}
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/* (lazy-string-type <gdb:lazy-string>) -> <gdb:type> */
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static SCM
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gdbscm_lazy_string_type (SCM self)
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{
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SCM ls_scm = lsscm_get_lazy_string_arg_unsafe (self, SCM_ARG1, FUNC_NAME);
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lazy_string_smob *ls_smob = (lazy_string_smob *) SCM_SMOB_DATA (ls_scm);
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return tyscm_scm_from_type (ls_smob->type);
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}
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/* (lazy-string->value <gdb:lazy-string>) -> <gdb:value> */
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static SCM
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gdbscm_lazy_string_to_value (SCM self)
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{
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SCM ls_scm = lsscm_get_lazy_string_arg_unsafe (self, SCM_ARG1, FUNC_NAME);
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lazy_string_smob *ls_smob = (lazy_string_smob *) SCM_SMOB_DATA (ls_scm);
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struct value *value = NULL;
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if (ls_smob->address == 0)
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{
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gdbscm_throw (gdbscm_make_out_of_range_error (FUNC_NAME, SCM_ARG1, self,
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_("cannot create a value from NULL")));
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}
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TRY
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{
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value = value_at_lazy (ls_smob->type, ls_smob->address);
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}
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CATCH (except, RETURN_MASK_ALL)
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{
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GDBSCM_HANDLE_GDB_EXCEPTION (except);
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}
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END_CATCH
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return vlscm_scm_from_value (value);
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}
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/* A "safe" version of gdbscm_lazy_string_to_value for use by
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vlscm_convert_typed_value_from_scheme.
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The result, upon success, is the value of <gdb:lazy-string> STRING.
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ARG_POS is the argument position of STRING in the original Scheme
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function call, used in exception text.
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If there's an error, NULL is returned and a <gdb:exception> object
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is stored in *except_scmp.
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Note: The result is still "lazy". The caller must call value_fetch_lazy
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to actually fetch the value. */
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struct value *
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lsscm_safe_lazy_string_to_value (SCM string, int arg_pos,
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const char *func_name, SCM *except_scmp)
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{
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lazy_string_smob *ls_smob;
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struct value *value = NULL;
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gdb_assert (lsscm_is_lazy_string (string));
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ls_smob = (lazy_string_smob *) SCM_SMOB_DATA (string);
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*except_scmp = SCM_BOOL_F;
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if (ls_smob->address == 0)
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{
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*except_scmp
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= gdbscm_make_out_of_range_error (FUNC_NAME, SCM_ARG1, string,
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_("cannot create a value from NULL"));
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return NULL;
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}
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TRY
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{
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value = value_at_lazy (ls_smob->type, ls_smob->address);
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}
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CATCH (except, RETURN_MASK_ALL)
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{
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*except_scmp = gdbscm_scm_from_gdb_exception (except);
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return NULL;
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}
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END_CATCH
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return value;
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}
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/* Print a lazy string to STREAM using val_print_string.
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STRING must be a <gdb:lazy-string> object. */
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void
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lsscm_val_print_lazy_string (SCM string, struct ui_file *stream,
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const struct value_print_options *options)
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{
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lazy_string_smob *ls_smob;
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gdb_assert (lsscm_is_lazy_string (string));
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ls_smob = (lazy_string_smob *) SCM_SMOB_DATA (string);
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val_print_string (ls_smob->type, ls_smob->encoding,
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ls_smob->address, ls_smob->length,
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stream, options);
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}
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/* Initialize the Scheme lazy-strings code. */
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static const scheme_function lazy_string_functions[] =
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{
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{ "lazy-string?", 1, 0, 0, as_a_scm_t_subr (gdbscm_lazy_string_p),
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"\
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Return #t if the object is a <gdb:lazy-string> object." },
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{ "lazy-string-address", 1, 0, 0,
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as_a_scm_t_subr (gdbscm_lazy_string_address),
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"\
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Return the address of the lazy-string." },
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{ "lazy-string-length", 1, 0, 0, as_a_scm_t_subr (gdbscm_lazy_string_length),
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"\
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Return the length of the lazy-string.\n\
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If the length is -1 then the length is determined by the first null\n\
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of appropriate width." },
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{ "lazy-string-encoding", 1, 0, 0,
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as_a_scm_t_subr (gdbscm_lazy_string_encoding),
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"\
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Return the encoding of the lazy-string." },
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{ "lazy-string-type", 1, 0, 0, as_a_scm_t_subr (gdbscm_lazy_string_type),
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"\
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Return the <gdb:type> of the lazy-string." },
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{ "lazy-string->value", 1, 0, 0,
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as_a_scm_t_subr (gdbscm_lazy_string_to_value),
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"\
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Return the <gdb:value> representation of the lazy-string." },
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END_FUNCTIONS
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};
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void
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gdbscm_initialize_lazy_strings (void)
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{
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lazy_string_smob_tag = gdbscm_make_smob_type (lazy_string_smob_name,
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sizeof (lazy_string_smob));
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scm_set_smob_free (lazy_string_smob_tag, lsscm_free_lazy_string_smob);
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scm_set_smob_print (lazy_string_smob_tag, lsscm_print_lazy_string_smob);
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gdbscm_define_functions (lazy_string_functions, 1);
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}
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