X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=gdb%2Fgdbserver%2Finferiors.c;h=e35186bda14eb90a91fe897d59aa1f5199ca798f;hb=4c5aa8e0b1b4439f73ef1f82344e408b989f85df;hp=2e3d1fe462af592309dfcc2b1fb56763ed19128f;hpb=7b6bb8daaceb9ecf3f42dea57ae82733d6a3b2f6;p=deliverable%2Fbinutils-gdb.git

diff --git a/gdb/gdbserver/inferiors.c b/gdb/gdbserver/inferiors.c
index 2e3d1fe462..e35186bda1 100644
--- a/gdb/gdbserver/inferiors.c
+++ b/gdb/gdbserver/inferiors.c
@@ -1,6 +1,5 @@
 /* Inferior process information for the remote server for GDB.
-   Copyright (C) 2002, 2005, 2007, 2008, 2009, 2010, 2011
-   Free Software Foundation, Inc.
+   Copyright (C) 2002-2019 Free Software Foundation, Inc.
 
    Contributed by MontaVista Software.
 
@@ -19,426 +18,130 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
-#include <stdlib.h>
-
 #include "server.h"
+#include "gdbthread.h"
+#include "dll.h"
 
-struct inferior_list all_processes;
-struct inferior_list all_threads;
-struct inferior_list all_dlls;
-int dlls_changed;
-
-struct thread_info *current_inferior;
-
-
-/* Oft used ptids */
-ptid_t null_ptid;
-ptid_t minus_one_ptid;
-
-/* Create a ptid given the necessary PID, LWP, and TID components.  */
-
-ptid_t
-ptid_build (int pid, long lwp, long tid)
-{
-  ptid_t ptid;
-
-  ptid.pid = pid;
-  ptid.lwp = lwp;
-  ptid.tid = tid;
-  return ptid;
-}
-
-/* Create a ptid from just a pid.  */
-
-ptid_t
-pid_to_ptid (int pid)
-{
-  return ptid_build (pid, 0, 0);
-}
-
-/* Fetch the pid (process id) component from a ptid.  */
-
-int
-ptid_get_pid (ptid_t ptid)
-{
-  return ptid.pid;
-}
-
-/* Fetch the lwp (lightweight process) component from a ptid.  */
-
-long
-ptid_get_lwp (ptid_t ptid)
-{
-  return ptid.lwp;
-}
-
-/* Fetch the tid (thread id) component from a ptid.  */
-
-long
-ptid_get_tid (ptid_t ptid)
-{
-  return ptid.tid;
-}
-
-/* ptid_equal() is used to test equality of two ptids.  */
-
-int
-ptid_equal (ptid_t ptid1, ptid_t ptid2)
-{
-  return (ptid1.pid == ptid2.pid
-	  && ptid1.lwp == ptid2.lwp
-	  && ptid1.tid == ptid2.tid);
-}
-
-/* Return true if this ptid represents a process.  */
-
-int
-ptid_is_pid (ptid_t ptid)
-{
-  if (ptid_equal (minus_one_ptid, ptid))
-    return 0;
-  if (ptid_equal (null_ptid, ptid))
-    return 0;
-
-  return (ptid_get_pid (ptid) != 0
-	  && ptid_get_lwp (ptid) == 0
-	  && ptid_get_tid (ptid) == 0);
-}
-
-#define get_thread(inf) ((struct thread_info *)(inf))
-#define get_dll(inf) ((struct dll_info *)(inf))
-
-void
-add_inferior_to_list (struct inferior_list *list,
-		      struct inferior_list_entry *new_inferior)
-{
-  new_inferior->next = NULL;
-  if (list->tail != NULL)
-    list->tail->next = new_inferior;
-  else
-    list->head = new_inferior;
-  list->tail = new_inferior;
-}
-
-/* Invoke ACTION for each inferior in LIST.  */
-
-void
-for_each_inferior (struct inferior_list *list,
-		   void (*action) (struct inferior_list_entry *))
-{
-  struct inferior_list_entry *cur = list->head, *next;
-
-  while (cur != NULL)
-    {
-      next = cur->next;
-      (*action) (cur);
-      cur = next;
-    }
-}
-
-void
-remove_inferior (struct inferior_list *list,
-		 struct inferior_list_entry *entry)
-{
-  struct inferior_list_entry **cur;
+std::list<process_info *> all_processes;
+std::list<thread_info *> all_threads;
 
-  if (list->head == entry)
-    {
-      list->head = entry->next;
-      if (list->tail == entry)
-	list->tail = list->head;
-      return;
-    }
+struct thread_info *current_thread;
 
-  cur = &list->head;
-  while (*cur && (*cur)->next != entry)
-    cur = &(*cur)->next;
-
-  if (*cur == NULL)
-    return;
-
-  (*cur)->next = entry->next;
-
-  if (list->tail == entry)
-    list->tail = *cur;
-}
+/* The current working directory used to start the inferior.  */
+static const char *current_inferior_cwd = NULL;
 
-void
+struct thread_info *
 add_thread (ptid_t thread_id, void *target_data)
 {
-  struct thread_info *new_thread = xmalloc (sizeof (*new_thread));
-
-  memset (new_thread, 0, sizeof (*new_thread));
+  struct thread_info *new_thread = XCNEW (struct thread_info);
 
-  new_thread->entry.id = thread_id;
+  new_thread->id = thread_id;
   new_thread->last_resume_kind = resume_continue;
   new_thread->last_status.kind = TARGET_WAITKIND_IGNORE;
 
-  add_inferior_to_list (&all_threads, & new_thread->entry);
+  all_threads.push_back (new_thread);
 
-  if (current_inferior == NULL)
-    current_inferior = new_thread;
+  if (current_thread == NULL)
+    current_thread = new_thread;
 
   new_thread->target_data = target_data;
-  set_inferior_regcache_data (new_thread, new_register_cache ());
-}
 
-ptid_t
-thread_id_to_gdb_id (ptid_t thread_id)
-{
-  struct inferior_list_entry *inf = all_threads.head;
-
-  while (inf != NULL)
-    {
-      if (ptid_equal (inf->id, thread_id))
-	return thread_id;
-      inf = inf->next;
-    }
-
-  return null_ptid;
+  return new_thread;
 }
 
-ptid_t
-thread_to_gdb_id (struct thread_info *thread)
+/* See gdbthread.h.  */
+
+struct thread_info *
+get_first_thread (void)
 {
-  return thread->entry.id;
+  if (!all_threads.empty ())
+    return all_threads.front ();
+  else
+    return NULL;
 }
 
 struct thread_info *
 find_thread_ptid (ptid_t ptid)
 {
-  struct inferior_list_entry *inf = all_threads.head;
+  return find_thread ([&] (thread_info *thread) {
+    return thread->id == ptid;
+  });
+}
 
-  while (inf != NULL)
-    {
-      struct thread_info *thread = get_thread (inf);
-      if (ptid_equal (thread->entry.id, ptid))
-	return thread;
-      inf = inf->next;
-    }
+/* Find a thread associated with the given PROCESS, or NULL if no
+   such thread exists.  */
 
-  return NULL;
+static struct thread_info *
+find_thread_process (const struct process_info *const process)
+{
+  return find_any_thread_of_pid (process->pid);
 }
 
-ptid_t
-gdb_id_to_thread_id (ptid_t gdb_id)
-{
-  struct thread_info *thread = find_thread_ptid (gdb_id);
+/* See gdbthread.h.  */
 
-  return thread ? thread->entry.id : null_ptid;
+struct thread_info *
+find_any_thread_of_pid (int pid)
+{
+  return find_thread (pid, [] (thread_info *thread) {
+    return true;
+  });
 }
 
 static void
-free_one_thread (struct inferior_list_entry *inf)
+free_one_thread (thread_info *thread)
 {
-  struct thread_info *thread = get_thread (inf);
-  free_register_cache (inferior_regcache_data (thread));
+  free_register_cache (thread_regcache_data (thread));
   free (thread);
 }
 
 void
 remove_thread (struct thread_info *thread)
 {
-  remove_inferior (&all_threads, (struct inferior_list_entry *) thread);
-  free_one_thread (&thread->entry);
-}
-
-/* Find the first inferior_list_entry E in LIST for which FUNC (E, ARG)
-   returns non-zero.  If no entry is found then return NULL.  */
-
-struct inferior_list_entry *
-find_inferior (struct inferior_list *list,
-	       int (*func) (struct inferior_list_entry *, void *), void *arg)
-{
-  struct inferior_list_entry *inf = list->head;
-
-  while (inf != NULL)
-    {
-      struct inferior_list_entry *next;
-
-      next = inf->next;
-      if ((*func) (inf, arg))
-	return inf;
-      inf = next;
-    }
-
-  return NULL;
-}
-
-struct inferior_list_entry *
-find_inferior_id (struct inferior_list *list, ptid_t id)
-{
-  struct inferior_list_entry *inf = list->head;
-
-  while (inf != NULL)
-    {
-      if (ptid_equal (inf->id, id))
-	return inf;
-      inf = inf->next;
-    }
-
-  return NULL;
-}
-
-void *
-inferior_target_data (struct thread_info *inferior)
-{
-  return inferior->target_data;
-}
+  if (thread->btrace != NULL)
+    target_disable_btrace (thread->btrace);
 
-void
-set_inferior_target_data (struct thread_info *inferior, void *data)
-{
-  inferior->target_data = data;
+  discard_queued_stop_replies (ptid_of (thread));
+  all_threads.remove (thread);
+  free_one_thread (thread);
+  if (current_thread == thread)
+    current_thread = NULL;
 }
 
 void *
-inferior_regcache_data (struct thread_info *inferior)
-{
-  return inferior->regcache_data;
-}
-
-void
-set_inferior_regcache_data (struct thread_info *inferior, void *data)
-{
-  inferior->regcache_data = data;
-}
-
-static void
-free_one_dll (struct inferior_list_entry *inf)
-{
-  struct dll_info *dll = get_dll (inf);
-  if (dll->name != NULL)
-    free (dll->name);
-  free (dll);
-}
-
-/* Find a DLL with the same name and/or base address.  A NULL name in
-   the key is ignored; so is an all-ones base address.  */
-
-static int
-match_dll (struct inferior_list_entry *inf, void *arg)
+thread_target_data (struct thread_info *thread)
 {
-  struct dll_info *iter = (void *) inf;
-  struct dll_info *key = arg;
-
-  if (key->base_addr != ~(CORE_ADDR) 0
-      && iter->base_addr == key->base_addr)
-    return 1;
-  else if (key->name != NULL
-	   && iter->name != NULL
-	   && strcmp (key->name, iter->name) == 0)
-    return 1;
-
-  return 0;
+  return thread->target_data;
 }
 
-/* Record a newly loaded DLL at BASE_ADDR.  */
-
-void
-loaded_dll (const char *name, CORE_ADDR base_addr)
+struct regcache *
+thread_regcache_data (struct thread_info *thread)
 {
-  struct dll_info *new_dll = xmalloc (sizeof (*new_dll));
-  memset (new_dll, 0, sizeof (*new_dll));
-
-  new_dll->entry.id = minus_one_ptid;
-
-  new_dll->name = xstrdup (name);
-  new_dll->base_addr = base_addr;
-
-  add_inferior_to_list (&all_dlls, &new_dll->entry);
-  dlls_changed = 1;
+  return thread->regcache_data;
 }
 
-/* Record that the DLL with NAME and BASE_ADDR has been unloaded.  */
-
 void
-unloaded_dll (const char *name, CORE_ADDR base_addr)
+set_thread_regcache_data (struct thread_info *thread, struct regcache *data)
 {
-  struct dll_info *dll;
-  struct dll_info key_dll;
-
-  /* Be careful not to put the key DLL in any list.  */
-  key_dll.name = (char *) name;
-  key_dll.base_addr = base_addr;
-
-  dll = (void *) find_inferior (&all_dlls, match_dll, &key_dll);
-
-  if (dll == NULL)
-    /* For some inferiors we might get unloaded_dll events without having
-       a corresponding loaded_dll.  In that case, the dll cannot be found
-       in ALL_DLL, and there is nothing further for us to do.
-
-       This has been observed when running 32bit executables on Windows64
-       (i.e. through WOW64, the interface between the 32bits and 64bits
-       worlds).  In that case, the inferior always does some strange
-       unloading of unnamed dll.  */
-    return;
-  else
-    {
-      /* DLL has been found so remove the entry and free associated
-         resources.  */
-      remove_inferior (&all_dlls, &dll->entry);
-      free_one_dll (&dll->entry);
-      dlls_changed = 1;
-    }
+  thread->regcache_data = data;
 }
 
-#define clear_list(LIST) \
-  do { (LIST)->head = (LIST)->tail = NULL; } while (0)
-
 void
 clear_inferiors (void)
 {
-  for_each_inferior (&all_threads, free_one_thread);
-  for_each_inferior (&all_dlls, free_one_dll);
-
-  clear_list (&all_threads);
-  clear_list (&all_dlls);
-
-  current_inferior = NULL;
-}
-
-/* Two utility functions for a truly degenerate inferior_list: a simple
-   PID listing.  */
-
-void
-add_pid_to_list (struct inferior_list *list, unsigned long pid)
-{
-  struct inferior_list_entry *new_entry;
+  for_each_thread (free_one_thread);
+  all_threads.clear ();
 
-  new_entry = xmalloc (sizeof (struct inferior_list_entry));
-  new_entry->id = pid_to_ptid (pid);
-  add_inferior_to_list (list, new_entry);
-}
+  clear_dlls ();
 
-int
-pull_pid_from_list (struct inferior_list *list, unsigned long pid)
-{
-  struct inferior_list_entry *new_entry;
-
-  new_entry = find_inferior_id (list, pid_to_ptid (pid));
-  if (new_entry == NULL)
-    return 0;
-  else
-    {
-      remove_inferior (list, new_entry);
-      free (new_entry);
-      return 1;
-    }
+  current_thread = NULL;
 }
 
 struct process_info *
 add_process (int pid, int attached)
 {
-  struct process_info *process;
-
-  process = xcalloc (1, sizeof (*process));
-
-  process->head.id = pid_to_ptid (pid);
-  process->attached = attached;
+  process_info *process = new process_info (pid, attached);
 
-  add_inferior_to_list (&all_processes, &process->head);
+  all_processes.push_back (process);
 
   return process;
 }
@@ -452,26 +155,28 @@ remove_process (struct process_info *process)
 {
   clear_symbol_cache (&process->symbol_cache);
   free_all_breakpoints (process);
-  remove_inferior (&all_processes, &process->head);
-  free (process);
+  gdb_assert (find_thread_process (process) == NULL);
+  all_processes.remove (process);
+  delete process;
 }
 
-struct process_info *
+process_info *
 find_process_pid (int pid)
 {
-  return (struct process_info *)
-    find_inferior_id (&all_processes, pid_to_ptid (pid));
+  return find_process ([&] (process_info *process) {
+    return process->pid == pid;
+  });
 }
 
-/* Return non-zero if INF, a struct process_info, was started by us,
-   i.e. not attached to.  */
+/* Get the first process in the process list, or NULL if the list is empty.  */
 
-static int
-started_inferior_callback (struct inferior_list_entry *entry, void *args)
+process_info *
+get_first_process (void)
 {
-  struct process_info *process = (struct process_info *) entry;
-
-  return ! process->attached;
+  if (!all_processes.empty ())
+    return all_processes.front ();
+  else
+    return NULL;
 }
 
 /* Return non-zero if there are any inferiors that we have created
@@ -480,18 +185,9 @@ started_inferior_callback (struct inferior_list_entry *entry, void *args)
 int
 have_started_inferiors_p (void)
 {
-  return (find_inferior (&all_processes, started_inferior_callback, NULL)
-	  != NULL);
-}
-
-/* Return non-zero if INF, a struct process_info, was attached to.  */
-
-static int
-attached_inferior_callback (struct inferior_list_entry *entry, void *args)
-{
-  struct process_info *process = (struct process_info *) entry;
-
-  return process->attached;
+  return find_process ([] (process_info *process) {
+    return !process->attached;
+  }) != NULL;
 }
 
 /* Return non-zero if there are any inferiors that we have attached to.  */
@@ -499,29 +195,49 @@ attached_inferior_callback (struct inferior_list_entry *entry, void *args)
 int
 have_attached_inferiors_p (void)
 {
-  return (find_inferior (&all_processes, attached_inferior_callback, NULL)
-	  != NULL);
+  return find_process ([] (process_info *process) {
+    return process->attached;
+  }) != NULL;
 }
 
 struct process_info *
-get_thread_process (struct thread_info *thread)
+get_thread_process (const struct thread_info *thread)
 {
-  int pid = ptid_get_pid (thread->entry.id);
-  return find_process_pid (pid);
+  return find_process_pid (thread->id.pid ());
 }
 
 struct process_info *
 current_process (void)
 {
-  if (current_inferior == NULL)
-    fatal ("Current inferior requested, but current_inferior is NULL\n");
+  gdb_assert (current_thread != NULL);
+  return get_thread_process (current_thread);
+}
+
+/* See gdbsupport/common-gdbthread.h.  */
+
+void
+switch_to_thread (ptid_t ptid)
+{
+  gdb_assert (ptid != minus_one_ptid);
+  current_thread = find_thread_ptid (ptid);
+}
 
-  return get_thread_process (current_inferior);
+/* See gdbsupport/common-inferior.h.  */
+
+const char *
+get_inferior_cwd ()
+{
+  return current_inferior_cwd;
 }
 
+/* See gdbsupport/common-inferior.h.  */
+
 void
-initialize_inferiors (void)
+set_inferior_cwd (const char *cwd)
 {
-  null_ptid = ptid_build (0, 0, 0);
-  minus_one_ptid = ptid_build (-1, 0, 0);
+  xfree ((void *) current_inferior_cwd);
+  if (cwd != NULL)
+    current_inferior_cwd = xstrdup (cwd);
+  else
+    current_inferior_cwd = NULL;
 }