a6a4b2c636
gdb/ChangeLog: 2019-03-02 Eli Zaretskii <eliz@gnu.org> * xml-syscall.c (xml_list_syscalls_by_group): Drop 'struct' from for-loop range, to avoid compiler warnings. * tui/tui.c (tui_enable) [__MINGW32__]: Don't declare 'cap', to avoid compiler warnings about unused variables.
562 lines
14 KiB
C
562 lines
14 KiB
C
/* Functions that provide the mechanism to parse a syscall XML file
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and get its values.
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Copyright (C) 2009-2019 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 "gdbtypes.h"
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#include "xml-support.h"
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#include "xml-syscall.h"
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#include "gdbarch.h"
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/* For the struct syscall definition. */
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#include "target.h"
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#include "filenames.h"
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#ifndef HAVE_LIBEXPAT
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/* Dummy functions to indicate that there's no support for fetching
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syscalls information. */
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static void
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syscall_warn_user (void)
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{
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static int have_warned = 0;
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if (!have_warned)
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{
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have_warned = 1;
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warning (_("Can not parse XML syscalls information; XML support was "
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"disabled at compile time."));
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}
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}
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void
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set_xml_syscall_file_name (struct gdbarch *gdbarch, const char *name)
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{
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return;
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}
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void
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get_syscall_by_number (struct gdbarch *gdbarch,
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int syscall_number, struct syscall *s)
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{
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syscall_warn_user ();
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s->number = syscall_number;
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s->name = NULL;
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}
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bool
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get_syscalls_by_name (struct gdbarch *gdbarch, const char *syscall_name,
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std::vector<int> *syscall_numbers)
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{
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syscall_warn_user ();
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return false;
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}
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const char **
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get_syscall_names (struct gdbarch *gdbarch)
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{
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syscall_warn_user ();
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return NULL;
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}
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bool
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get_syscalls_by_group (struct gdbarch *gdbarch, const char *group,
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std::vector<int> *syscall_numbers)
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{
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syscall_warn_user ();
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return false;
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}
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const char **
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get_syscall_group_names (struct gdbarch *gdbarch)
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{
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syscall_warn_user ();
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return NULL;
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}
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#else /* ! HAVE_LIBEXPAT */
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/* Structure which describes a syscall. */
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struct syscall_desc
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{
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syscall_desc (int number_, std::string name_, std::string alias_)
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: number (number_), name (name_), alias (alias_)
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{}
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/* The syscall number. */
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int number;
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/* The syscall name. */
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std::string name;
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/* An optional alias. */
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std::string alias;
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};
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typedef std::unique_ptr<syscall_desc> syscall_desc_up;
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/* Structure of a syscall group. */
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struct syscall_group_desc
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{
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syscall_group_desc (const std::string &name_)
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: name (name_)
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{}
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/* The group name. */
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std::string name;
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/* The syscalls that are part of the group. This is a non-owning
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reference. */
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std::vector<syscall_desc *> syscalls;
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};
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typedef std::unique_ptr<syscall_group_desc> syscall_group_desc_up;
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/* Structure that represents syscalls information. */
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struct syscalls_info
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{
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/* The syscalls. */
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std::vector<syscall_desc_up> syscalls;
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/* The syscall groups. */
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std::vector<syscall_group_desc_up> groups;
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/* Variable that will hold the last known data-directory. This is
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useful to know whether we should re-read the XML info for the
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target. */
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std::string my_gdb_datadir;
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};
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typedef std::unique_ptr<syscalls_info> syscalls_info_up;
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/* Callback data for syscall information parsing. */
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struct syscall_parsing_data
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{
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/* The syscalls_info we are building. */
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struct syscalls_info *syscalls_info;
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};
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/* Create a new syscall group. Return pointer to the
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syscall_group_desc structure that represents the new group. */
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static struct syscall_group_desc *
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syscall_group_create_syscall_group_desc (struct syscalls_info *syscalls_info,
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const char *group)
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{
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syscall_group_desc *groupdesc = new syscall_group_desc (group);
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syscalls_info->groups.emplace_back (groupdesc);
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return groupdesc;
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}
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/* Add a syscall to the group. If group doesn't exist, create it. */
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static void
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syscall_group_add_syscall (struct syscalls_info *syscalls_info,
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struct syscall_desc *syscall,
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const char *group)
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{
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/* Search for an existing group. */
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std::vector<syscall_group_desc_up>::iterator it
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= syscalls_info->groups.begin ();
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for (; it != syscalls_info->groups.end (); it++)
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{
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if ((*it)->name == group)
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break;
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}
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syscall_group_desc *groupdesc;
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if (it != syscalls_info->groups.end ())
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groupdesc = it->get ();
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else
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{
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/* No group was found with this name. We must create a new
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one. */
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groupdesc = syscall_group_create_syscall_group_desc (syscalls_info,
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group);
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}
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groupdesc->syscalls.push_back (syscall);
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}
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static void
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syscall_create_syscall_desc (struct syscalls_info *syscalls_info,
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const char *name, int number, const char *alias,
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char *groups)
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{
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syscall_desc *sysdesc = new syscall_desc (number, name,
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alias != NULL ? alias : "");
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syscalls_info->syscalls.emplace_back (sysdesc);
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/* Add syscall to its groups. */
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if (groups != NULL)
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{
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for (char *group = strtok (groups, ",");
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group != NULL;
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group = strtok (NULL, ","))
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syscall_group_add_syscall (syscalls_info, sysdesc, group);
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}
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}
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/* Handle the start of a <syscall> element. */
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static void
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syscall_start_syscall (struct gdb_xml_parser *parser,
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const struct gdb_xml_element *element,
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void *user_data,
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std::vector<gdb_xml_value> &attributes)
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{
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struct syscall_parsing_data *data = (struct syscall_parsing_data *) user_data;
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/* syscall info. */
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char *name = NULL;
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int number = 0;
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char *alias = NULL;
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char *groups = NULL;
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for (const gdb_xml_value &attr : attributes)
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{
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if (strcmp (attr.name, "name") == 0)
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name = (char *) attr.value.get ();
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else if (strcmp (attr.name, "number") == 0)
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number = * (ULONGEST *) attr.value.get ();
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else if (strcmp (attr.name, "alias") == 0)
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alias = (char *) attr.value.get ();
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else if (strcmp (attr.name, "groups") == 0)
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groups = (char *) attr.value.get ();
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else
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internal_error (__FILE__, __LINE__,
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_("Unknown attribute name '%s'."), attr.name);
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}
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gdb_assert (name);
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syscall_create_syscall_desc (data->syscalls_info, name, number, alias,
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groups);
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}
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/* The elements and attributes of an XML syscall document. */
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static const struct gdb_xml_attribute syscall_attr[] = {
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{ "number", GDB_XML_AF_NONE, gdb_xml_parse_attr_ulongest, NULL },
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{ "name", GDB_XML_AF_NONE, NULL, NULL },
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{ "alias", GDB_XML_AF_OPTIONAL, NULL, NULL },
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{ "groups", GDB_XML_AF_OPTIONAL, NULL, NULL },
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{ NULL, GDB_XML_AF_NONE, NULL, NULL }
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};
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static const struct gdb_xml_element syscalls_info_children[] = {
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{ "syscall", syscall_attr, NULL,
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GDB_XML_EF_OPTIONAL | GDB_XML_EF_REPEATABLE,
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syscall_start_syscall, NULL },
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{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
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};
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static const struct gdb_xml_element syselements[] = {
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{ "syscalls_info", NULL, syscalls_info_children,
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GDB_XML_EF_NONE, NULL, NULL },
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{ NULL, NULL, NULL, GDB_XML_EF_NONE, NULL, NULL }
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};
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static struct syscalls_info *
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syscall_parse_xml (const char *document, xml_fetch_another fetcher,
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void *fetcher_baton)
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{
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struct syscall_parsing_data data;
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syscalls_info_up sysinfo (new syscalls_info ());
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data.syscalls_info = sysinfo.get ();
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if (gdb_xml_parse_quick (_("syscalls info"), NULL,
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syselements, document, &data) == 0)
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{
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/* Parsed successfully. */
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return sysinfo.release ();
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}
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else
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{
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warning (_("Could not load XML syscalls info; ignoring"));
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return NULL;
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}
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}
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/* Function responsible for initializing the information
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about the syscalls. It reads the XML file and fills the
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struct syscalls_info with the values.
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Returns the struct syscalls_info if the file is valid, NULL otherwise. */
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static struct syscalls_info *
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xml_init_syscalls_info (const char *filename)
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{
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gdb::optional<gdb::char_vector> full_file
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= xml_fetch_content_from_file (filename, gdb_datadir);
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if (!full_file)
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return NULL;
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return syscall_parse_xml (full_file->data (),
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xml_fetch_content_from_file,
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(void *) ldirname (filename).c_str ());
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}
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/* Initializes the syscalls_info structure according to the
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architecture. */
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static void
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init_syscalls_info (struct gdbarch *gdbarch)
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{
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struct syscalls_info *syscalls_info = gdbarch_syscalls_info (gdbarch);
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const char *xml_syscall_file = gdbarch_xml_syscall_file (gdbarch);
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/* Should we re-read the XML info for this target? */
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if (syscalls_info != NULL && !syscalls_info->my_gdb_datadir.empty ()
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&& filename_cmp (syscalls_info->my_gdb_datadir.c_str (),
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gdb_datadir) != 0)
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{
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/* The data-directory changed from the last time we used it.
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It means that we have to re-read the XML info. */
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delete syscalls_info;
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syscalls_info = NULL;
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set_gdbarch_syscalls_info (gdbarch, NULL);
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}
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/* Did we succeed at initializing this? */
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if (syscalls_info != NULL)
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return;
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syscalls_info = xml_init_syscalls_info (xml_syscall_file);
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/* If there was some error reading the XML file, we initialize
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gdbarch->syscalls_info anyway, in order to store information
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about our attempt. */
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if (syscalls_info == NULL)
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syscalls_info = new struct syscalls_info ();
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if (syscalls_info->syscalls.empty ())
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{
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if (xml_syscall_file != NULL)
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warning (_("Could not load the syscall XML file `%s/%s'."),
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gdb_datadir, xml_syscall_file);
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else
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warning (_("There is no XML file to open."));
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warning (_("GDB will not be able to display "
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"syscall names nor to verify if\n"
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"any provided syscall numbers are valid."));
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}
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/* Saving the data-directory used to read this XML info. */
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syscalls_info->my_gdb_datadir.assign (gdb_datadir);
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set_gdbarch_syscalls_info (gdbarch, syscalls_info);
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}
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/* Search for a syscall group by its name. Return syscall_group_desc
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structure for the group if found or NULL otherwise. */
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static struct syscall_group_desc *
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syscall_group_get_group_by_name (const struct syscalls_info *syscalls_info,
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const char *group)
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{
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if (syscalls_info == NULL)
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return NULL;
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if (group == NULL)
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return NULL;
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/* Search for existing group. */
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for (const syscall_group_desc_up &groupdesc : syscalls_info->groups)
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{
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if (groupdesc->name == group)
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return groupdesc.get ();
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}
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return NULL;
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}
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static bool
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xml_get_syscalls_by_name (struct gdbarch *gdbarch, const char *syscall_name,
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std::vector<int> *syscall_numbers)
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{
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struct syscalls_info *syscalls_info = gdbarch_syscalls_info (gdbarch);
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bool found = false;
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if (syscalls_info != NULL && syscall_name != NULL && syscall_numbers != NULL)
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for (const syscall_desc_up &sysdesc : syscalls_info->syscalls)
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if (sysdesc->name == syscall_name || sysdesc->alias == syscall_name)
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{
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syscall_numbers->push_back (sysdesc->number);
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found = true;
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}
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return found;
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}
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static const char *
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xml_get_syscall_name (struct gdbarch *gdbarch,
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int syscall_number)
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{
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struct syscalls_info *syscalls_info = gdbarch_syscalls_info (gdbarch);
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if (syscalls_info == NULL
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|| syscall_number < 0)
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return NULL;
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for (const syscall_desc_up &sysdesc : syscalls_info->syscalls)
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if (sysdesc->number == syscall_number)
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return sysdesc->name.c_str ();
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return NULL;
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}
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static const char **
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xml_list_of_syscalls (struct gdbarch *gdbarch)
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{
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struct syscalls_info *syscalls_info = gdbarch_syscalls_info (gdbarch);
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if (syscalls_info == NULL)
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return NULL;
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int nsyscalls = syscalls_info->syscalls.size ();
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const char **names = XNEWVEC (const char *, nsyscalls + 1);
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int i;
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for (i = 0; i < syscalls_info->syscalls.size (); i++)
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names[i] = syscalls_info->syscalls[i]->name.c_str ();
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names[i] = NULL;
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return names;
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}
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/* Iterate over the syscall_group_desc element to return a list of
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syscalls that are part of the given group. If the syscall group
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doesn't exist, return false. */
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static bool
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xml_list_syscalls_by_group (struct gdbarch *gdbarch, const char *group,
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std::vector<int> *syscalls)
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{
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struct syscalls_info *syscalls_info = gdbarch_syscalls_info (gdbarch);
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struct syscall_group_desc *groupdesc;
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if (syscalls_info == NULL || syscalls == NULL)
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return false;
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groupdesc = syscall_group_get_group_by_name (syscalls_info, group);
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if (groupdesc == NULL)
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return false;
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for (const syscall_desc *sysdesc : groupdesc->syscalls)
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syscalls->push_back (sysdesc->number);
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return true;
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}
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/* Return a NULL terminated list of syscall groups or an empty list, if
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no syscall group is available. Return NULL, if there is no syscall
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information available. */
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static const char **
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xml_list_of_groups (struct gdbarch *gdbarch)
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{
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struct syscalls_info *syscalls_info = gdbarch_syscalls_info (gdbarch);
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const char **names = NULL;
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int ngroups;
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int i;
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if (syscalls_info == NULL)
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return NULL;
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ngroups = syscalls_info->groups.size ();
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names = (const char**) xmalloc ((ngroups + 1) * sizeof (char *));
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for (i = 0; i < syscalls_info->groups.size (); i++)
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names[i] = syscalls_info->groups[i]->name.c_str ();
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names[i] = NULL;
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return names;
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}
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void
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set_xml_syscall_file_name (struct gdbarch *gdbarch, const char *name)
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{
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set_gdbarch_xml_syscall_file (gdbarch, name);
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}
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void
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get_syscall_by_number (struct gdbarch *gdbarch,
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int syscall_number, struct syscall *s)
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{
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init_syscalls_info (gdbarch);
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s->number = syscall_number;
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s->name = xml_get_syscall_name (gdbarch, syscall_number);
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}
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bool
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get_syscalls_by_name (struct gdbarch *gdbarch, const char *syscall_name,
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std::vector<int> *syscall_numbers)
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{
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init_syscalls_info (gdbarch);
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return xml_get_syscalls_by_name (gdbarch, syscall_name, syscall_numbers);
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}
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const char **
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get_syscall_names (struct gdbarch *gdbarch)
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{
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init_syscalls_info (gdbarch);
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return xml_list_of_syscalls (gdbarch);
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}
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/* See comment in xml-syscall.h. */
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bool
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get_syscalls_by_group (struct gdbarch *gdbarch, const char *group,
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std::vector<int> *syscall_numbers)
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{
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init_syscalls_info (gdbarch);
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return xml_list_syscalls_by_group (gdbarch, group, syscall_numbers);
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|
}
|
|
|
|
/* See comment in xml-syscall.h. */
|
|
|
|
const char **
|
|
get_syscall_group_names (struct gdbarch *gdbarch)
|
|
{
|
|
init_syscalls_info (gdbarch);
|
|
|
|
return xml_list_of_groups (gdbarch);
|
|
}
|
|
|
|
#endif /* ! HAVE_LIBEXPAT */
|