/* libthread_db assisted debugging support, generic parts.
- Copyright (C) 1999-2017 Free Software Foundation, Inc.
+ Copyright (C) 1999-2018 Free Software Foundation, Inc.
This file is part of GDB.
#include "solib.h"
#include "solib-svr4.h"
#include "gdbcore.h"
-#include "observer.h"
+#include "observable.h"
#include "linux-nat.h"
#include "nat/linux-procfs.h"
#include "nat/linux-ptrace.h"
#include <ctype.h>
#include "nat/linux-namespaces.h"
#include <algorithm>
+#include "common/pathstuff.h"
/* GNU/Linux libthread_db support.
}
static void
-set_libthread_db_search_path (char *ignored, int from_tty,
+set_libthread_db_search_path (const char *ignored, int from_tty,
struct cmd_list_element *c)
{
if (*libthread_db_search_path == '\0')
/* Use "struct private_thread_info" to cache thread state. This is
a substantial optimization. */
-struct private_thread_info
+struct thread_db_thread_info : public private_thread_info
{
/* Flag set when we see a TD_DEATH event for this thread. */
- unsigned int dying:1;
+ bool dying = false;
/* Cached thread state. */
- td_thrhandle_t th;
- thread_t tid;
+ td_thrhandle_t th {};
+ thread_t tid {};
};
-\f
+
+static thread_db_thread_info *
+get_thread_db_thread_info (thread_info *thread)
+{
+ return static_cast<thread_db_thread_info *> (thread->priv.get ());
+}
static const char *
thread_db_err_str (td_err_e err)
static int
try_thread_db_load_from_pdir_1 (struct objfile *obj, const char *subdir)
{
- struct cleanup *cleanup;
- char *path, *cp;
- int result;
const char *obj_name = objfile_name (obj);
- int alloc_len;
if (obj_name[0] != '/')
{
return 0;
}
- alloc_len = (strlen (obj_name)
- + (subdir ? strlen (subdir) + 1 : 0)
- + 1 + strlen (LIBTHREAD_DB_SO) + 1);
- path = (char *) xmalloc (alloc_len);
- cleanup = make_cleanup (xfree, path);
-
- strcpy (path, obj_name);
- cp = strrchr (path, '/');
+ std::string path = obj_name;
+ size_t cp = path.rfind ('/');
/* This should at minimum hit the first character. */
- gdb_assert (cp != NULL);
- cp[1] = '\0';
+ gdb_assert (cp != std::string::npos);
+ path.resize (cp + 1);
if (subdir != NULL)
- {
- strcat (cp, subdir);
- strcat (cp, "/");
- }
- strcat (cp, LIBTHREAD_DB_SO);
-
- result = try_thread_db_load (path, 1);
+ path = path + subdir + "/";
+ path += LIBTHREAD_DB_SO;
- do_cleanups (cleanup);
- return result;
+ return try_thread_db_load (path.c_str (), 1);
}
/* Handle $pdir in libthread-db-search-path.
static int
try_thread_db_load_from_dir (const char *dir, size_t dir_len)
{
- struct cleanup *cleanup;
- char *path;
- int result;
-
if (!auto_load_thread_db)
return 0;
- path = (char *) xmalloc (dir_len + 1 + strlen (LIBTHREAD_DB_SO) + 1);
- cleanup = make_cleanup (xfree, path);
-
- memcpy (path, dir, dir_len);
- path[dir_len] = '/';
- strcpy (path + dir_len + 1, LIBTHREAD_DB_SO);
-
- result = try_thread_db_load (path, 1);
+ std::string path = std::string (dir, dir_len) + "/" + LIBTHREAD_DB_SO;
- do_cleanups (cleanup);
- return result;
+ return try_thread_db_load (path.c_str (), 1);
}
/* Search libthread_db_search_path for libthread_db which "agrees"
static int
thread_db_load_search (void)
{
- VEC (char_ptr) *dir_vec;
- struct cleanup *cleanups;
- char *this_dir;
- int i, rc = 0;
+ int rc = 0;
- dir_vec = dirnames_to_char_ptr_vec (libthread_db_search_path);
- cleanups = make_cleanup_free_char_ptr_vec (dir_vec);
+ std::vector<gdb::unique_xmalloc_ptr<char>> dir_vec
+ = dirnames_to_char_ptr_vec (libthread_db_search_path);
- for (i = 0; VEC_iterate (char_ptr, dir_vec, i, this_dir); ++i)
+ for (const gdb::unique_xmalloc_ptr<char> &this_dir_up : dir_vec)
{
+ const char *this_dir = this_dir_up.get ();
const int pdir_len = sizeof ("$pdir") - 1;
size_t this_dir_len;
&& (this_dir[pdir_len] == '\0'
|| this_dir[pdir_len] == '/'))
{
- char *subdir = NULL;
- struct cleanup *free_subdir_cleanup
- = make_cleanup (null_cleanup, NULL);
+ const char *subdir = NULL;
+ std::string subdir_holder;
if (this_dir[pdir_len] == '/')
{
- subdir = (char *) xmalloc (strlen (this_dir));
- make_cleanup (xfree, subdir);
- strcpy (subdir, this_dir + pdir_len + 1);
+ subdir_holder = std::string (this_dir + pdir_len + 1);
+ subdir = subdir_holder.c_str ();
}
rc = try_thread_db_load_from_pdir (subdir);
- do_cleanups (free_subdir_cleanup);
if (rc)
break;
}
}
}
- do_cleanups (cleanups);
if (libthread_db_debug)
fprintf_unfiltered (gdb_stdlog,
_("thread_db_load_search returning %d\n"), rc);
if (objfile != NULL
/* libpthread with separate debug info has its debug info file already
loaded (and notified without successful thread_db initialization)
- the time observer_notify_new_objfile is called for the library itself.
+ the time gdb::observers::new_objfile.notify is called for the library itself.
Static executables have their separate debug info loaded already
before the inferior has started. */
&& objfile->separate_debug_objfile_backlink == NULL
from libthread_db thread state information. */
static void
-update_thread_state (struct private_thread_info *priv,
+update_thread_state (thread_db_thread_info *priv,
const td_thrinfo_t *ti_p)
{
priv->dying = (ti_p->ti_state == TD_THR_UNKNOWN
ptid_t ptid, const td_thrhandle_t *th_p,
const td_thrinfo_t *ti_p)
{
- struct private_thread_info *priv;
-
/* A thread ID of zero may mean the thread library has not
initialized yet. Leave private == NULL until the thread library
has initialized. */
return tp;
/* Construct the thread's private data. */
- priv = XCNEW (struct private_thread_info);
+ thread_db_thread_info *priv = new thread_db_thread_info;
priv->th = *th_p;
priv->tid = ti_p->ti_tid;
if (tp == NULL || tp->state == THREAD_EXITED)
tp = add_thread_with_info (ptid, priv);
else
- tp->priv = priv;
+ tp->priv.reset (priv);
if (target_has_execution)
check_thread_signals ();
}
static void
-thread_db_detach (struct target_ops *ops, const char *args, int from_tty)
+thread_db_detach (struct target_ops *ops, inferior *inf, int from_tty)
{
struct target_ops *target_beneath = find_target_beneath (ops);
- struct thread_db_info *info;
-
- info = get_thread_db_info (ptid_get_pid (inferior_ptid));
- if (info)
- delete_thread_db_info (ptid_get_pid (inferior_ptid));
+ delete_thread_db_info (inf->pid);
- target_beneath->to_detach (target_beneath, args, from_tty);
+ target_beneath->to_detach (target_beneath, inf, from_tty);
/* NOTE: From this point on, inferior_ptid is null_ptid. */
if (thread_info != NULL && thread_info->priv != NULL)
{
static char buf[64];
- thread_t tid;
+ thread_db_thread_info *priv = get_thread_db_thread_info (thread_info);
- tid = thread_info->priv->tid;
snprintf (buf, sizeof (buf), "Thread 0x%lx (LWP %ld)",
- (unsigned long) tid, ptid_get_lwp (ptid));
+ (unsigned long) priv->tid, ptid_get_lwp (ptid));
return buf;
}
if (info->priv == NULL)
return NULL;
- if (info->priv->dying)
+ thread_db_thread_info *priv = get_thread_db_thread_info (info);
+
+ if (priv->dying)
return "Exiting";
return NULL;
}
+/* Return pointer to the thread_info struct which corresponds to
+ THREAD_HANDLE (having length HANDLE_LEN). */
+
+static struct thread_info *
+thread_db_thread_handle_to_thread_info (struct target_ops *ops,
+ const gdb_byte *thread_handle,
+ int handle_len,
+ struct inferior *inf)
+{
+ struct thread_info *tp;
+ thread_t handle_tid;
+
+ /* Thread handle sizes must match in order to proceed. We don't use an
+ assert here because the resulting internal error will cause GDB to
+ exit. This isn't necessarily an internal error due to the possibility
+ of garbage being passed as the thread handle via the python interface. */
+ if (handle_len != sizeof (handle_tid))
+ error (_("Thread handle size mismatch: %d vs %zu (from libthread_db)"),
+ handle_len, sizeof (handle_tid));
+
+ handle_tid = * (const thread_t *) thread_handle;
+
+ ALL_NON_EXITED_THREADS (tp)
+ {
+ thread_db_thread_info *priv = get_thread_db_thread_info (tp);
+
+ if (tp->inf == inf && priv != NULL && handle_tid == priv->tid)
+ return tp;
+ }
+
+ return NULL;
+}
+
/* Get the address of the thread local variable in load module LM which
is stored at OFFSET within the thread local storage for thread PTID. */
{
td_err_e err;
psaddr_t address;
- struct thread_db_info *info;
-
- info = get_thread_db_info (ptid_get_pid (ptid));
+ thread_db_info *info = get_thread_db_info (ptid_get_pid (ptid));
+ thread_db_thread_info *priv = get_thread_db_thread_info (thread_info);
/* Finally, get the address of the variable. */
if (lm != 0)
/* Note the cast through uintptr_t: this interface only works if
a target address fits in a psaddr_t, which is a host pointer.
So a 32-bit debugger can not access 64-bit TLS through this. */
- err = info->td_thr_tls_get_addr_p (&thread_info->priv->th,
+ err = info->td_thr_tls_get_addr_p (&priv->th,
(psaddr_t)(uintptr_t) lm,
offset, &address);
}
PR libc/16831 due to GDB PR threads/16954 LOAD_MODULE is also NULL.
The constant number 1 depends on GNU __libc_setup_tls
initialization of l_tls_modid to 1. */
- err = info->td_thr_tlsbase_p (&thread_info->priv->th,
- 1, &address);
+ err = info->td_thr_tlsbase_p (&priv->th, 1, &address);
address = (char *) address + offset;
}
beneath->to_resume (beneath, ptid, step, signo);
}
-/* qsort helper function for info_auto_load_libthread_db, sort the
+/* std::sort helper function for info_auto_load_libthread_db, sort the
thread_db_info pointers primarily by their FILENAME and secondarily by their
PID, both in ascending order. */
-static int
-info_auto_load_libthread_db_compare (const void *ap, const void *bp)
+static bool
+info_auto_load_libthread_db_compare (const struct thread_db_info *a,
+ const struct thread_db_info *b)
{
- struct thread_db_info *a = *(struct thread_db_info **) ap;
- struct thread_db_info *b = *(struct thread_db_info **) bp;
int retval;
retval = strcmp (a->filename, b->filename);
if (retval)
- return retval;
+ return retval < 0;
- return (a->pid > b->pid) - (a->pid - b->pid);
+ return a->pid < b->pid;
}
/* Implement 'info auto-load libthread-db'. */
static void
-info_auto_load_libthread_db (char *args, int from_tty)
+info_auto_load_libthread_db (const char *args, int from_tty)
{
struct ui_out *uiout = current_uiout;
const char *cs = args ? args : "";
- struct thread_db_info *info, **array;
- unsigned info_count, unique_filenames;
- size_t max_filename_len, max_pids_len, pids_len;
- struct cleanup *back_to;
- char *pids;
+ struct thread_db_info *info;
+ unsigned unique_filenames;
+ size_t max_filename_len, pids_len;
int i;
- cs = skip_spaces_const (cs);
+ cs = skip_spaces (cs);
if (*cs)
error (_("'info auto-load libthread-db' does not accept any parameters"));
- info_count = 0;
- for (info = thread_db_list; info; info = info->next)
- if (info->filename != NULL)
- info_count++;
-
- array = XNEWVEC (struct thread_db_info *, info_count);
- back_to = make_cleanup (xfree, array);
-
- info_count = 0;
+ std::vector<struct thread_db_info *> array;
for (info = thread_db_list; info; info = info->next)
if (info->filename != NULL)
- array[info_count++] = info;
+ array.push_back (info);
/* Sort ARRAY by filenames and PIDs. */
-
- qsort (array, info_count, sizeof (*array),
- info_auto_load_libthread_db_compare);
+ std::sort (array.begin (), array.end (),
+ info_auto_load_libthread_db_compare);
/* Calculate the number of unique filenames (rows) and the maximum string
length of PIDs list for the unique filenames (columns). */
unique_filenames = 0;
max_filename_len = 0;
- max_pids_len = 0;
pids_len = 0;
- for (i = 0; i < info_count; i++)
+ for (i = 0; i < array.size (); i++)
{
int pid = array[i]->pid;
size_t this_pid_len;
strlen (array[i]->filename));
if (i > 0)
- {
- pids_len -= strlen (", ");
- max_pids_len = std::max (max_pids_len, pids_len);
- }
+ pids_len -= strlen (", ");
pids_len = 0;
}
pids_len += this_pid_len + strlen (", ");
}
if (i)
- {
- pids_len -= strlen (", ");
- max_pids_len = std::max (max_pids_len, pids_len);
- }
+ pids_len -= strlen (", ");
/* Table header shifted right by preceding "libthread-db: " would not match
its columns. */
- if (info_count > 0 && args == auto_load_info_scripts_pattern_nl)
+ if (array.size () > 0 && args == auto_load_info_scripts_pattern_nl)
uiout->text ("\n");
{
uiout->table_header (pids_len, ui_left, "PIDs", "Pids");
uiout->table_body ();
- pids = (char *) xmalloc (max_pids_len + 1);
- make_cleanup (xfree, pids);
-
/* Note I is incremented inside the cycle, not at its end. */
- for (i = 0; i < info_count;)
+ for (i = 0; i < array.size ();)
{
ui_out_emit_tuple tuple_emitter (uiout, NULL);
- char *pids_end;
info = array[i];
uiout->field_string ("filename", info->filename);
- pids_end = pids;
- while (i < info_count && strcmp (info->filename,
- array[i]->filename) == 0)
+ std::string pids;
+ while (i < array.size () && strcmp (info->filename,
+ array[i]->filename) == 0)
{
- if (pids_end != pids)
- {
- *pids_end++ = ',';
- *pids_end++ = ' ';
- }
- pids_end += xsnprintf (pids_end,
- &pids[max_pids_len + 1] - pids_end,
- "%u", array[i]->pid);
- gdb_assert (pids_end < &pids[max_pids_len + 1]);
-
+ if (!pids.empty ())
+ pids += ", ";
+ string_appendf (pids, "%u", array[i]->pid);
i++;
}
- *pids_end = '\0';
- uiout->field_string ("pids", pids);
+ uiout->field_string ("pids", pids.c_str ());
uiout->text ("\n");
}
}
- do_cleanups (back_to);
-
- if (info_count == 0)
+ if (array.empty ())
uiout->message (_("No auto-loaded libthread-db.\n"));
}
= thread_db_get_thread_local_address;
thread_db_ops.to_extra_thread_info = thread_db_extra_thread_info;
thread_db_ops.to_get_ada_task_ptid = thread_db_get_ada_task_ptid;
+ thread_db_ops.to_thread_handle_to_thread_info = thread_db_thread_handle_to_thread_info;
thread_db_ops.to_magic = OPS_MAGIC;
complete_target_initialization (&thread_db_ops);
}
-/* Provide a prototype to silence -Wmissing-prototypes. */
-extern initialize_file_ftype _initialize_thread_db;
-
void
_initialize_thread_db (void)
{
auto_load_info_cmdlist_get ());
/* Add ourselves to objfile event chain. */
- observer_attach_new_objfile (thread_db_new_objfile);
+ gdb::observers::new_objfile.attach (thread_db_new_objfile);
/* Add ourselves to inferior_created event chain.
This is needed to handle debugging statically linked programs where
the new_objfile observer won't get called for libpthread. */
- observer_attach_inferior_created (thread_db_inferior_created);
+ gdb::observers::inferior_created.attach (thread_db_inferior_created);
}
projects / deliverable / binutils-gdb.git / blobdiff