2009-04-01 Pedro Alves <pedro@codesourcery.com>

	Implement the multiprocess extensions, and add linux multiprocess
	support.

	* server.h (ULONGEST): Declare.
	(struct ptid, ptid_t): New.
	(minus_one_ptid, null_ptid): Declare.
	(ptid_build, pid_to_ptid, ptid_get_pid, ptid_get_lwp)
	(ptid_get_tid, ptid_equal, ptid_is_pid): Declare.
	(struct inferior_list_entry): Change `id' type from unsigned from
	to ptid_t.
	(struct sym_cache, struct breakpoint, struct
	process_info_private): Forward declare.
	(struct process_info): Declare.
	(current_process): Declare.
	(all_processes): Declare.
	(initialize_inferiors): Declare.
	(add_thread): Adjust to use ptid_t.
	(thread_id_to_gdb_id, thread_to_gdb_id, gdb_id_to_thread_id): Ditto.
	(add_process, remove_process, find_thread_pid): Declare.
	(find_inferior_id): Adjust to use ptid_t.
	(cont_thread, general_thread, step_thread): Change type to ptid_t.
	(multi_process): Declare.
	(push_event): Adjust to use ptid_t.
	(read_ptid, write_ptid): Declare.
	(prepare_resume_reply): Adjust to use ptid_t.
	(clear_symbol_cache): Declare.
	* inferiors.c (all_processes): New.
	(null_ptid, minus_one_ptid): New.
	(ptid_build, pid_to_ptid, ptid_get_pid, ptid_get_lwp)
	(ptid_get_tid, ptid_equal, ptid_is_pid): New.
	(add_thread): Change unsigned long to ptid.  Remove gdb_id
	parameter.  Adjust.
	(thread_id_to_gdb_id, thread_to_gdb_id): Change unsigned long to ptid.
	(gdb_id_to_thread): Rename to ...
	(find_thread_pid): ... this.  Change unsigned long to ptid.
	(gdb_id_to_thread_id, find_inferior_id): Change unsigned long to ptid.
	(loaded_dll, pull_pid_from_list): Adjust.
	(add_process, remove_process, find_process_pid)
	(get_thread_process, current_process, initialize_inferiors): New.
	* target.h (struct thread_resume) <thread>: Change type to ptid_t.
	(struct target_waitstatus) <related_pid>: Ditto.
	(struct target_ops) <kill, detach>: Add `pid' argument.  Change
	return type to int.
	(struct target_ops) <join>: Add `pid' argument.
	(struct target_ops) <thread_alive>: Change pid's type to ptid_t.
	(struct target_ops) <wait>: Add `ptid' field.  Change return type
	to ptid.
	(kill_inferior, detach_inferior, join_inferior): Add `pid' argument.
	(mywait): Add `ptid' argument.  Change return type to ptid_t.
	(target_pid_to_str): Declare.
	* target.c (set_desired_inferior): Adjust to use ptids.
	(mywait): Add new `ptid' argument.  Adjust.
	(target_pid_to_str): New.
	* mem-break.h (free_all_breakpoints): Declare.
	* mem-break.c (breakpoints): Delelete.
	(set_breakpoint_at, delete_breakpoint, find_breakpoint_at)
	(check_mem_read, check_mem_write, delete_all_breakpoints): Adjust
	to use per-process breakpoint list.
	(free_all_breakpoints): New.
	* remote-utils.c (struct sym_cache) <name>: Drop `const'.
	(symbol_cache, all_symbols_looked_up): Delete.
	(hexchars): New.
	(ishex, unpack_varlen_hex, write_ptid, hex_or_minus_one,
	read_ptid): New.
	(prepare_resume_reply): Change ptid argument's type from unsigned
	long to ptid_t.  Adjust.  Implement W;process and X;process.
	(free_sym_cache, clear_symbol_cache): New.
	(look_up_one_symbol): Adjust to per-process symbol cache.  *
	* server.c (cont_thread, general_thread, step_thread): Change type
	to ptid_t.
	(attached): Delete.
	(multi_process): New.
	(last_ptid): Change type to ptid_t.
	(struct vstop_notif) <ptid>: Change type to ptid_t.
	(queue_stop_reply, push_event): Change `ptid' argument's type to
	ptid_t.
	(discard_queued_stop_replies): Add `pid' argument.
	(start_inferior): Adjust to use ptids.  Adjust to mywait interface
	changes.  Don't reference the `attached' global.
	(attach_inferior): Adjust to mywait interface changes.
	(handle_query): Adjust to use ptids.  Parse GDB's qSupported
	features.  Handle and report "multiprocess+".  Handle
	"qAttached:PID".
	(handle_v_cont): Adjust to use ptids.  Adjust to mywait interface
	changes.
	(handle_v_kill): New.
	(handle_v_stopped): Adjust to use target_pid_to_str.
	(handle_v_requests): Allow multiple attaches and runs when
	multiprocess extensions are in effect.  Handle "vKill".
	(myresume): Adjust to use ptids.
	(queue_stop_reply_callback): Add `arg' parameter.  Handle it.
	(handle_status): Adjust to discard_queued_stop_replies interface
	change.
	(first_thread_of, kill_inferior_callback)
	(detach_or_kill_inferior_callback, join_inferiors_callback): New.
	(main): Call initialize_inferiors.  Adjust to use ptids, killing
	and detaching from all inferiors.  Handle multiprocess packet
	variants.
	* linux-low.h: Include gdb_proc_service.h.
	(struct process_info_private): New.
	(struct linux_target_ops) <pid_of>: Use ptid_get_pid.
	<lwpid_of>: Use ptid_get_lwp.
	(get_lwp_thread): Adjust.
	(struct lwp_info): Add `dead' member.
	(find_lwp_pid): Declare.
	* linux-low.c (thread_db_active): Delete.
	(new_inferior): Adjust comment.
	(inferior_pid): Delete.
	(linux_add_process): New.
	(handle_extended_wait): Adjust.
	(add_lwp): Change unsigned long to ptid.
	(linux_create_inferior): Add process to processes table.  Adjust
	to use ptids.  Don't set new_inferior here.
	(linux_attach_lwp): Rename to ...
	(linux_attach_lwp_1): ... this.  Add `initial' argument.  Handle
	it.  Adjust to use ptids.
	(linux_attach_lwp): New.
	(linux_attach): Add process to processes table.  Don't set
	new_inferior here.
	(struct counter): New.
	(second_thread_of_pid_p, last_thread_of_process_p): New.
	(linux_kill_one_lwp): Add `args' parameter.  Handle it.  Adjust to
	multiple processes.
	(linux_kill): Add `pid' argument.  Handle it.  Adjust to multiple
	processes.  Remove process from process table.
	(linux_detach_one_lwp): Add `args' parameter.  Handle it.  Adjust
	to multiple processes.
	(any_thread_of): New.
	(linux_detach): Add `pid' argument, and handle it.  Remove process
	from processes table.
	(linux_join): Add `pid' argument.  Handle it.
	(linux_thread_alive): Change unsighed long argument to ptid_t.
	Consider dead lwps as not being alive.
	(status_pending_p): Rename `dummy' argument to `arg'.  Filter out
	threads we're not interested in.
	(same_lwp, find_lwp_pid): New.
	(linux_wait_for_lwp): Change `pid' argument's type from int to
	ptid_t.  Adjust.
	(linux_wait_for_event): Rename to ...
	(linux_wait_for_event_1): ... this.  Change `pid' argument's type
	from int to ptid_t.  Adjust.
	(linux_wait_for_event): New.
	(linux_wait_1): Add `ptid' argument.  Change return type to
	ptid_t.  Adjust.  Use last_thread_of_process_p.  Remove processes
	that exit from the process table.
	(linux_wait): Add `ptid' argument.  Change return type to ptid_t.
	Adjust.
	(mark_lwp_dead): New.
	(wait_for_sigstop): Adjust to use ptids.  If a process exits while
	stopping all threads, mark its main lwp as dead.
	(linux_set_resume_request, linux_resume_one_thread): Adjust to use
	ptids.
	(fetch_register, usr_store_inferior_registers)
	(regsets_fetch_inferior_registers)
	(regsets_store_inferior_registers, linux_read_memory)
	(linux_write_memory): Inline `inferior_pid'.
	(linux_look_up_symbols): Adjust to use per-process
	`thread_db_active'.
	(linux_request_interrupt): Adjust to use ptids.
	(linux_read_auxv): Inline `inferior_pid'.
	(initialize_low): Don't reference thread_db_active.
	* gdb_proc_service.h (struct ps_prochandle) <pid>: Remove.
	* proc-service.c (ps_lgetregs): Use find_lwp_pid.
	(ps_getpid): Return the pid of the current inferior.
	* thread-db.c (proc_handle, thread_agent): Delete.
	(thread_db_create_event, thread_db_enable_reporting): Adjust to
	per-process data.
	(find_one_thread): Change argument type to ptid_t.  Adjust to
	per-process data.
	(maybe_attach_thread): Adjust to per-process data and ptids.
	(thread_db_find_new_threads): Ditto.
	(thread_db_init): Ditto.
	* spu-low.c (spu_create_inferior, spu_attach): Add process to
	processes table.  Adjust to use ptids.
	(spu_kill, spu_detach): Adjust interface.  Remove process from
	processes table.
	(spu_join, spu_thread_alive): Adjust interface.
	(spu_wait): Adjust interface.  Remove process from processes
	table.  Adjust to use ptids.
	* win32-low.c (current_inferior_tid): Delete.
	(current_inferior_ptid): New.
	(debug_event_ptid): New.
	(thread_rec): Take a ptid.  Adjust.
	(child_add_thread): Add `pid' argument.  Adjust to use ptids.
	(child_delete_thread): Ditto.
	(do_initial_child_stuff): Add `attached' argument.  Add process to
	processes table.
	(child_fetch_inferior_registers, child_store_inferior_registers):
	Adjust.
	(win32_create_inferior): Pass 0 to do_initial_child_stuff.
	(win32_attach): Pass 1 to do_initial_child_stuff.
	(win32_kill): Adjust interface.  Remove process from processes
	table.
	(win32_detach): Ditto.
	(win32_join): Adjust interface.
	(win32_thread_alive): Take a ptid.
	(win32_resume): Adjust to use ptids.
	(get_child_debug_event): Ditto.
	(win32_wait): Adjust interface.  Remove exiting process from
	processes table.

1 files changed, 121 insertions, 11 deletions

diff --git a/gdb/gdbserver/server.h b/gdb/gdbserver/server.h
index 12fef0f..1af5313 100644
--- a/gdb/gdbserver/server.h
+++ b/gdb/gdbserver/server.h
@@ -85,6 +85,70 @@ typedef unsigned char gdb_byte;
    least the size of a (void *).  */
 typedef long long CORE_ADDR;
 
+typedef unsigned long long ULONGEST;
+
+/* The ptid struct is a collection of the various "ids" necessary
+   for identifying the inferior.  This consists of the process id
+   (pid), thread id (tid), and other fields necessary for uniquely
+   identifying the inferior process/thread being debugged.  When
+   manipulating ptids, the constructors, accessors, and predicate
+   declared in server.h should be used.  These are as follows:
+
+      ptid_build	- Make a new ptid from a pid, lwp, and tid.
+      pid_to_ptid	- Make a new ptid from just a pid.
+      ptid_get_pid	- Fetch the pid component of a ptid.
+      ptid_get_lwp	- Fetch the lwp component of a ptid.
+      ptid_get_tid	- Fetch the tid component of a ptid.
+      ptid_equal	- Test to see if two ptids are equal.
+
+   Please do NOT access the struct ptid members directly (except, of
+   course, in the implementation of the above ptid manipulation
+   functions).  */
+
+struct ptid
+  {
+    /* Process id */
+    int pid;
+
+    /* Lightweight process id */
+    long lwp;
+
+    /* Thread id */
+    long tid;
+  };
+
+typedef struct ptid ptid_t;
+
+/* The -1 ptid, often used to indicate either an error condition or a
+   "don't care" condition, i.e, "run all threads".  */
+extern ptid_t minus_one_ptid;
+
+/* The null or zero ptid, often used to indicate no process.  */
+extern ptid_t null_ptid;
+
+/* Attempt to find and return an existing ptid with the given PID,
+   LWP, and TID components.  If none exists, create a new one and
+   return that.  */
+ptid_t ptid_build (int pid, long lwp, long tid);
+
+/* Create a ptid from just a pid.  */
+ptid_t pid_to_ptid (int pid);
+
+/* Fetch the pid (process id) component from a ptid.  */
+int ptid_get_pid (ptid_t ptid);
+
+/* Fetch the lwp (lightweight process) component from a ptid.  */
+long ptid_get_lwp (ptid_t ptid);
+
+/* Fetch the tid (thread id) component from a ptid.  */
+long ptid_get_tid (ptid_t ptid);
+
+/* Compare two ptids to see if they are equal.  */
+extern int ptid_equal (ptid_t p1, ptid_t p2);
+
+/* Return true if this ptid represents a process id.  */
+extern int ptid_is_pid (ptid_t ptid);
+
 /* Generic information for tracking a list of ``inferiors'' - threads,
    processes, etc.  */
 struct inferior_list
@@ -94,7 +158,7 @@ struct inferior_list
 };
 struct inferior_list_entry
 {
-  unsigned long id;
+  ptid_t id;
   struct inferior_list_entry *next;
 };
 
@@ -108,6 +172,36 @@ struct dll_info
   CORE_ADDR base_addr;
 };
 
+struct sym_cache;
+struct breakpoint;
+struct process_info_private;
+
+struct process_info
+{
+  struct inferior_list_entry head;
+
+  int attached;
+
+  /* The symbol cache.  */
+  struct sym_cache *symbol_cache;
+
+  /* If this flag has been set, assume symbol cache misses are
+     failures.  */
+  int all_symbols_looked_up;
+
+  /* The list of memory breakpoints.  */
+  struct breakpoint *breakpoints;
+
+  /* Private target data.  */
+  struct process_info_private *private;
+};
+
+/* Return a pointer to the process that corresponds to the current
+   thread (current_inferior).  It is an error to call this if there is
+   no current thread selected.  */
+
+struct process_info *current_process (void);
+
 #include "regcache.h"
 #include "gdb/signals.h"
 #include "gdb_signals.h"
@@ -120,22 +214,33 @@ void initialize_low ();
 
 /* From inferiors.c.  */
 
+extern struct inferior_list all_processes;
 extern struct inferior_list all_threads;
 extern struct inferior_list all_dlls;
 extern int dlls_changed;
 
+void initialize_inferiors (void);
+
 void add_inferior_to_list (struct inferior_list *list,
 			   struct inferior_list_entry *new_inferior);
 void for_each_inferior (struct inferior_list *list,
 			void (*action) (struct inferior_list_entry *));
+
 extern struct thread_info *current_inferior;
 void remove_inferior (struct inferior_list *list,
 		      struct inferior_list_entry *entry);
 void remove_thread (struct thread_info *thread);
-void add_thread (unsigned long thread_id, void *target_data, unsigned int);
-unsigned int thread_id_to_gdb_id (unsigned long);
-unsigned int thread_to_gdb_id (struct thread_info *);
-unsigned long gdb_id_to_thread_id (unsigned int);
+void add_thread (ptid_t ptid, void *target_data);
+
+struct process_info *add_process (int pid, int attached);
+void remove_process (struct process_info *process);
+struct process_info *find_process_pid (int pid);
+
+struct thread_info *find_thread_pid (ptid_t ptid);
+
+ptid_t thread_id_to_gdb_id (ptid_t);
+ptid_t thread_to_gdb_id (struct thread_info *);
+ptid_t gdb_id_to_thread_id (ptid_t);
 struct thread_info *gdb_id_to_thread (unsigned int);
 void clear_inferiors (void);
 struct inferior_list_entry *find_inferior
@@ -144,7 +249,7 @@ struct inferior_list_entry *find_inferior
 		   void *),
       void *arg);
 struct inferior_list_entry *find_inferior_id (struct inferior_list *list,
-					      unsigned long id);
+					      ptid_t id);
 void *inferior_target_data (struct thread_info *);
 void set_inferior_target_data (struct thread_info *, void *);
 void *inferior_regcache_data (struct thread_info *);
@@ -157,9 +262,9 @@ void unloaded_dll (const char *name, CORE_ADDR base_addr);
 
 /* Public variables in server.c */
 
-extern unsigned long cont_thread;
-extern unsigned long general_thread;
-extern unsigned long step_thread;
+extern ptid_t cont_thread;
+extern ptid_t general_thread;
+extern ptid_t step_thread;
 
 extern int server_waiting;
 extern int debug_threads;
@@ -172,6 +277,7 @@ extern int disable_packet_Tthread;
 extern int disable_packet_qC;
 extern int disable_packet_qfThreadInfo;
 
+extern int multi_process;
 extern int non_stop;
 
 /* Functions from event-loop.c.  */
@@ -188,7 +294,7 @@ extern void start_event_loop (void);
 extern void handle_serial_event (int err, gdb_client_data client_data);
 extern void handle_target_event (int err, gdb_client_data client_data);
 
-extern void push_event (unsigned long ptid, struct target_waitstatus *status);
+extern void push_event (ptid_t ptid, struct target_waitstatus *status);
 
 /* Functions from hostio.c.  */
 extern int handle_vFile (char *, int, int *);
@@ -203,6 +309,9 @@ extern int all_symbols_looked_up;
 extern int noack_mode;
 extern int transport_is_reliable;
 
+ptid_t read_ptid (char *buf, char **obuf);
+char *write_ptid (char *buf, ptid_t ptid);
+
 int putpkt (char *buf);
 int putpkt_binary (char *buf, int len);
 int putpkt_notif (char *buf);
@@ -219,7 +328,7 @@ void convert_ascii_to_int (char *from, unsigned char *to, int n);
 void convert_int_to_ascii (unsigned char *from, char *to, int n);
 void new_thread_notify (int id);
 void dead_thread_notify (int id);
-void prepare_resume_reply (char *buf, unsigned long thread_id,
+void prepare_resume_reply (char *buf, ptid_t ptid,
 			   struct target_waitstatus *status);
 
 const char *decode_address_to_semicolon (CORE_ADDR *addrp, const char *start);
@@ -244,6 +353,7 @@ int remote_escape_output (const gdb_byte *buffer, int len,
 			  gdb_byte *out_buf, int *out_len,
 			  int out_maxlen);
 
+void clear_symbol_cache (struct sym_cache **symcache_p);
 int look_up_one_symbol (const char *name, CORE_ADDR *addrp);
 
 void monitor_output (const char *msg);