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Made debug events and contexts standard objects. 

Use sleep_on to wait on debug events.
This commit is contained in:
Alexandre Julliard 2000-01-04 02:24:43 +00:00
parent 9de03f4f6a
commit 79b1ec8290
1 changed files with 225 additions and 164 deletions
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389
server/debugger.c
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@ -6,6 +6,7 @@
#include <assert.h> #include <assert.h>
#include <string.h> #include <string.h>
#include <stdio.h>
#include "winbase.h" #include "winbase.h"
#include "winerror.h" #include "winerror.h"
@ -15,23 +16,72 @@
#include "thread.h" #include "thread.h"
#include "request.h" #include "request.h"
enum debug_event_state { EVENT_QUEUED, EVENT_SENT, EVENT_CONTINUED };
/* debug event */
struct debug_event struct debug_event
{ {
struct debug_event *next; /* event queue */ struct object obj; /* object header */
struct debug_event *next; /* event queue */
struct debug_event *prev; struct debug_event *prev;
struct thread *thread; /* thread which sent this event */ struct thread *sender; /* thread which sent this event */
int sent; /* already sent to the debugger? */ struct thread *debugger; /* debugger thread receiving the event */
int code; /* event code */ enum debug_event_state state; /* event state */
union debug_event_data data; /* event data */ int status; /* continuation status */
int code; /* event code */
union debug_event_data data; /* event data */
}; };
/* debug context */
struct debug_ctx struct debug_ctx
{ {
struct thread *owner; /* thread owning this debug context */ struct object obj; /* object header */
int waiting; /* is thread waiting for an event? */
struct timeout_user *timeout; /* timeout user for wait timeout */
struct debug_event *event_head; /* head of pending events queue */ struct debug_event *event_head; /* head of pending events queue */
struct debug_event *event_tail; /* tail of pending events queue */ struct debug_event *event_tail; /* tail of pending events queue */
struct debug_event *to_send; /* next event on the queue to send to debugger */
};
static void debug_event_dump( struct object *obj, int verbose );
static int debug_event_signaled( struct object *obj, struct thread *thread );
static void debug_event_destroy( struct object *obj );
static const struct object_ops debug_event_ops =
{
sizeof(struct debug_event), /* size */
debug_event_dump, /* dump */
add_queue, /* add_queue */
remove_queue, /* remove_queue */
debug_event_signaled, /* signaled */
no_satisfied, /* satisfied */
NULL, /* get_poll_events */
NULL, /* poll_event */
no_read_fd, /* get_read_fd */
no_write_fd, /* get_write_fd */
no_flush, /* flush */
no_get_file_info, /* get_file_info */
debug_event_destroy /* destroy */
};
static void debug_ctx_dump( struct object *obj, int verbose );
static int debug_ctx_signaled( struct object *obj, struct thread *thread );
static void debug_ctx_destroy( struct object *obj );
static const struct object_ops debug_ctx_ops =
{
sizeof(struct debug_ctx), /* size */
debug_ctx_dump, /* dump */
add_queue, /* add_queue */
remove_queue, /* remove_queue */
debug_ctx_signaled, /* signaled */
no_satisfied, /* satisfied */
NULL, /* get_poll_events */
NULL, /* poll_event */
no_read_fd, /* get_read_fd */
no_write_fd, /* get_write_fd */
no_flush, /* flush */
no_get_file_info, /* get_file_info */
debug_ctx_destroy /* destroy */
}; };
/* size of the event data */ /* size of the event data */
@ -102,35 +152,6 @@ static int fill_debug_event( struct thread *debugger, struct thread *thread,
return 1; return 1;
} }
/* free a debug event structure */
static void free_event( struct thread *debugger, struct debug_event *event )
{
/* If the event has been sent already, the handles are now under the */
/* responsibility of the debugger process, so we don't touch them */
if (!event->sent)
{
switch(event->code)
{
case CREATE_THREAD_DEBUG_EVENT:
close_handle( debugger->process, event->data.create_thread.handle );
break;
case CREATE_PROCESS_DEBUG_EVENT:
if (event->data.create_process.file != -1)
close_handle( debugger->process, event->data.create_process.file );
close_handle( debugger->process, event->data.create_process.thread );
close_handle( debugger->process, event->data.create_process.process );
break;
case LOAD_DLL_DEBUG_EVENT:
if (event->data.load_dll.handle != -1)
close_handle( debugger->process, event->data.load_dll.handle );
break;
}
}
event->thread->debug_event = NULL;
release_object( event->thread );
free( event );
}
/* unlink the first event from the queue */ /* unlink the first event from the queue */
static void unlink_event( struct debug_ctx *debug_ctx, struct debug_event *event ) static void unlink_event( struct debug_ctx *debug_ctx, struct debug_event *event )
{ {
@ -138,129 +159,189 @@ static void unlink_event( struct debug_ctx *debug_ctx, struct debug_event *event
else debug_ctx->event_head = event->next; else debug_ctx->event_head = event->next;
if (event->next) event->next->prev = event->prev; if (event->next) event->next->prev = event->prev;
else debug_ctx->event_tail = event->prev; else debug_ctx->event_tail = event->prev;
if (debug_ctx->to_send == event) debug_ctx->to_send = event->next;
event->next = event->prev = NULL; event->next = event->prev = NULL;
release_object( event );
} }
/* link an event at the end of the queue */ /* link an event at the end of the queue */
static void link_event( struct debug_ctx *debug_ctx, struct debug_event *event ) static void link_event( struct debug_ctx *debug_ctx, struct debug_event *event )
{ {
grab_object( event );
event->next = NULL; event->next = NULL;
event->prev = debug_ctx->event_tail; event->prev = debug_ctx->event_tail;
debug_ctx->event_tail = event;
if (event->prev) event->prev->next = event; if (event->prev) event->prev->next = event;
else debug_ctx->event_head = event; else debug_ctx->event_head = event;
debug_ctx->event_tail = event; if (!debug_ctx->to_send)
}
/* send the first queue event as a reply */
static void build_event_reply( struct debug_ctx *debug_ctx )
{
struct debug_event *event = debug_ctx->event_head;
struct thread *thread = event->thread;
struct wait_debug_event_request *req = get_req_ptr( debug_ctx->owner );
assert( event );
assert( debug_ctx->waiting );
unlink_event( debug_ctx, event );
event->sent = 1;
req->code = event->code;
req->pid = thread->process;
req->tid = thread;
debug_ctx->waiting = 0;
if (debug_ctx->timeout)
{ {
remove_timeout_user( debug_ctx->timeout ); debug_ctx->to_send = event;
debug_ctx->timeout = NULL; wake_up( &debug_ctx->obj, 0 );
} }
debug_ctx->owner->error = 0;
memcpy( req + 1, &event->data, event_sizes[event->code] );
} }
/* timeout callback while waiting for a debug event */ /* build a reply for the wait_debug_event request */
static void wait_event_timeout( void *ctx ) static void build_wait_debug_reply( struct thread *thread, struct object *obj, int signaled )
{ {
struct debug_ctx *debug_ctx = (struct debug_ctx *)ctx; struct wait_debug_event_request *req = get_req_ptr( thread );
struct wait_debug_event_request *req = get_req_ptr( debug_ctx->owner );
assert( debug_ctx->waiting ); if (obj)
{
struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
struct debug_event *event = debug_ctx->to_send;
req->code = 0; /* the object that woke us has to be our debug context */
req->pid = 0; assert( obj->ops == &debug_ctx_ops );
req->tid = 0; assert( event );
debug_ctx->waiting = 0;
debug_ctx->timeout = NULL; event->state = EVENT_SENT;
debug_ctx->owner->error = WAIT_TIMEOUT; debug_ctx->to_send = event->next;
send_reply( debug_ctx->owner ); req->code = event->code;
req->pid = event->sender->process;
req->tid = event->sender;
memcpy( req + 1, &event->data, event_sizes[event->code] );
}
else /* timeout or error */
{
req->code = 0;
req->pid = 0;
req->tid = 0;
thread->error = signaled;
}
}
/* build a reply for the send_event request */
static void build_send_event_reply( struct thread *thread, struct object *obj, int signaled )
{
struct send_debug_event_request *req = get_req_ptr( thread );
struct debug_event *event = (struct debug_event *)obj;
assert( obj->ops == &debug_event_ops );
req->status = event->status;
/* copy the context into the reply */
if (event->code == EXCEPTION_DEBUG_EVENT)
memcpy( req + 1, &event->data, event_sizes[event->code] );
}
static void debug_event_dump( struct object *obj, int verbose )
{
struct debug_event *debug_event = (struct debug_event *)obj;
assert( obj->ops == &debug_event_ops );
fprintf( stderr, "Debug event sender=%p code=%d state=%d\n",
debug_event->sender, debug_event->code, debug_event->state );
}
static int debug_event_signaled( struct object *obj, struct thread *thread )
{
struct debug_event *debug_event = (struct debug_event *)obj;
assert( obj->ops == &debug_event_ops );
return debug_event->state == EVENT_CONTINUED;
}
static void debug_event_destroy( struct object *obj )
{
struct debug_event *event = (struct debug_event *)obj;
assert( obj->ops == &debug_event_ops );
/* cannot still be in the queue */
assert( !event->next );
assert( !event->prev );
/* If the event has been sent already, the handles are now under the */
/* responsibility of the debugger process, so we don't touch them */
if (event->state == EVENT_QUEUED)
{
struct process *debugger = event->debugger->process;
switch(event->code)
{
case CREATE_THREAD_DEBUG_EVENT:
close_handle( debugger, event->data.create_thread.handle );
break;
case CREATE_PROCESS_DEBUG_EVENT:
if (event->data.create_process.file != -1)
close_handle( debugger, event->data.create_process.file );
close_handle( debugger, event->data.create_process.thread );
close_handle( debugger, event->data.create_process.process );
break;
case LOAD_DLL_DEBUG_EVENT:
if (event->data.load_dll.handle != -1)
close_handle( debugger, event->data.load_dll.handle );
break;
}
}
release_object( event->sender );
release_object( event->debugger );
}
static void debug_ctx_dump( struct object *obj, int verbose )
{
struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
assert( obj->ops == &debug_ctx_ops );
fprintf( stderr, "Debug context head=%p tail=%p to_send=%p\n",
debug_ctx->event_head, debug_ctx->event_tail, debug_ctx->to_send );
}
static int debug_ctx_signaled( struct object *obj, struct thread *thread )
{
struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
assert( obj->ops == &debug_ctx_ops );
return debug_ctx->to_send != NULL;
}
static void debug_ctx_destroy( struct object *obj )
{
struct debug_event *event;
struct debug_ctx *debug_ctx = (struct debug_ctx *)obj;
assert( obj->ops == &debug_ctx_ops );
/* free all pending events */
while ((event = debug_ctx->event_head) != NULL) unlink_event( debug_ctx, event );
} }
/* wait for a debug event (or send a reply at once if one is pending) */ /* wait for a debug event (or send a reply at once if one is pending) */
static int wait_for_debug_event( int timeout ) static int wait_for_debug_event( int timeout )
{ {
struct debug_ctx *debug_ctx = current->debug_ctx; struct debug_ctx *debug_ctx = current->debug_ctx;
struct timeval when; struct object *obj = &debug_ctx->obj;
int flags = 0;
if (!debug_ctx) /* current thread is not a debugger */ if (!debug_ctx) /* current thread is not a debugger */
{ {
set_error( ERROR_INVALID_HANDLE ); set_error( ERROR_INVALID_HANDLE );
return 0; return 0;
} }
assert( !debug_ctx->waiting ); if (timeout != -1) flags = SELECT_TIMEOUT;
if (debug_ctx->event_head) /* already have a pending event */ return sleep_on( 1, &obj, flags, timeout, build_wait_debug_reply );
{
debug_ctx->waiting = 1;
build_event_reply( debug_ctx );
return 1;
}
if (!timeout) /* no event and we don't want to wait */
{
set_error( WAIT_TIMEOUT );
return 0;
}
if (timeout != -1) /* start the timeout */
{
gettimeofday( &when, 0 );
add_timeout( &when, timeout );
if (!(debug_ctx->timeout = add_timeout_user( &when, wait_event_timeout, debug_ctx )))
return 0;
}
debug_ctx->waiting = 1;
current->state = SLEEPING;
return 1;
} }
/* continue a debug event */ /* continue a debug event */
static int continue_debug_event( struct process *process, struct thread *thread, int status ) static int continue_debug_event( struct process *process, struct thread *thread, int status )
{ {
struct debug_event *event = thread->debug_event; struct debug_event *event;
struct debug_ctx *debug_ctx = current->debug_ctx;
if (process->debugger != current || thread->process != process || !event || !event->sent) if (!debug_ctx || process->debugger != current || thread->process != process) goto error;
{
/* not debugging this process, or no event pending */
set_error( ERROR_ACCESS_DENIED ); /* FIXME */
return 0;
}
if (thread->state != TERMINATED)
{
/* only send a reply if the thread is still there */
/* (we can get a continue on an exit thread/process event) */
struct send_debug_event_request *req = get_req_ptr( thread );
req->status = status;
/* copy the context into the reply */
if (event->code == EXCEPTION_DEBUG_EVENT)
memcpy( req + 1, &event->data, event_sizes[event->code] );
send_reply( thread );
}
free_event( current, event ); /* find the event in the queue */
for (event = debug_ctx->event_head; event; event = event->next)
if (thread->exit_event)
{ {
/* we still have a queued exit event, promote it to normal event */ if (event == debug_ctx->to_send) goto error;
thread->debug_event = thread->exit_event; if (event->sender == thread) break;
thread->exit_event = NULL; event = event->next;
} }
if (!event) goto error;
event->status = status;
event->state = EVENT_CONTINUED;
wake_up( &event->obj, 0 );
unlink_event( debug_ctx, event );
resume_process( process ); resume_process( process );
return 1; return 1;
error:
/* not debugging this process, or no such event */
set_error( ERROR_ACCESS_DENIED ); /* FIXME */
return 0;
} }
/* queue a debug event for a debugger */ /* queue a debug event for a debugger */
@ -275,35 +356,24 @@ static struct debug_event *queue_debug_event( struct thread *debugger, struct th
assert( debugger->process != thread->process ); assert( debugger->process != thread->process );
/* build the event */ /* build the event */
if (!(event = mem_alloc( sizeof(*event) - sizeof(event->data) + event_sizes[code] ))) if (!(event = alloc_object( &debug_event_ops, -1 ))) return NULL;
return NULL; event->next = NULL;
event->sent = 0; event->prev = NULL;
event->code = code; event->state = EVENT_QUEUED;
event->thread = (struct thread *)grab_object( thread ); event->code = code;
event->sender = (struct thread *)grab_object( thread );
event->debugger = (struct thread *)grab_object( debugger );
memcpy( &event->data, data, event_sizes[code] ); memcpy( &event->data, data, event_sizes[code] );
if (!fill_debug_event( debugger, thread, event )) if (!fill_debug_event( debugger, thread, event ))
{ {
release_object( event->thread ); event->code = -1; /* make sure we don't attempt to close handles */
free( event ); release_object( event );
return NULL; return NULL;
} }
if (thread->debug_event)
{
/* exit events can happen while another one is still queued */
assert( code == EXIT_THREAD_DEBUG_EVENT || code == EXIT_PROCESS_DEBUG_EVENT );
thread->exit_event = event;
}
else thread->debug_event = event;
link_event( debug_ctx, event ); link_event( debug_ctx, event );
suspend_process( thread->process ); suspend_process( thread->process );
if (debug_ctx->waiting)
{
build_event_reply( debug_ctx );
send_reply( debug_ctx->owner );
}
return event; return event;
} }
@ -328,12 +398,10 @@ int debugger_attach( struct process *process, struct thread *debugger )
if (!debugger->debug_ctx) /* need to allocate a context */ if (!debugger->debug_ctx) /* need to allocate a context */
{ {
if (!(debug_ctx = mem_alloc( sizeof(*debug_ctx) ))) return 0; if (!(debug_ctx = alloc_object( &debug_ctx_ops, -1 ))) return 0;
debug_ctx->owner = current;
debug_ctx->waiting = 0;
debug_ctx->timeout = NULL;
debug_ctx->event_head = NULL; debug_ctx->event_head = NULL;
debug_ctx->event_tail = NULL; debug_ctx->event_tail = NULL;
debug_ctx->to_send = NULL;
debugger->debug_ctx = debug_ctx; debugger->debug_ctx = debug_ctx;
} }
process->debugger = debugger; process->debugger = debugger;
@ -348,32 +416,23 @@ void debug_exit_thread( struct thread *thread, int exit_code )
if (debugger) /* being debugged -> send an event to the debugger */ if (debugger) /* being debugged -> send an event to the debugger */
{ {
struct debug_event_exit event; struct debug_event *event;
event.exit_code = exit_code; struct debug_event_exit exit;
exit.exit_code = exit_code;
if (thread->process->running_threads == 1) if (thread->process->running_threads == 1)
/* this is the last thread, send an exit process event */ /* this is the last thread, send an exit process event */
queue_debug_event( debugger, thread, EXIT_PROCESS_DEBUG_EVENT, &event ); event = queue_debug_event( debugger, thread, EXIT_PROCESS_DEBUG_EVENT, &exit );
else else
queue_debug_event( debugger, thread, EXIT_THREAD_DEBUG_EVENT, &event ); event = queue_debug_event( debugger, thread, EXIT_THREAD_DEBUG_EVENT, &exit );
if (event) release_object( event );
} }
if (debug_ctx) /* this thread is a debugger */ if (debug_ctx) /* this thread is a debugger */
{ {
struct debug_event *event;
/* kill all debugged processes */ /* kill all debugged processes */
kill_debugged_processes( thread, exit_code ); kill_debugged_processes( thread, exit_code );
/* free all pending events */
while ((event = debug_ctx->event_head) != NULL)
{
unlink_event( debug_ctx, event );
free_event( thread, event );
}
/* remove the timeout */
if (debug_ctx->timeout) remove_timeout_user( debug_ctx->timeout );
thread->debug_ctx = NULL; thread->debug_ctx = NULL;
free( debug_ctx ); release_object( debug_ctx );
} }
} }
@ -411,7 +470,7 @@ DECL_HANDLER(debug_process)
if (process) if (process)
{ {
debugger_attach( process, current ); debugger_attach( process, current );
/* FIXME: should notice the debugged process somehow */ /* FIXME: should notify the debugged process somehow */
release_object( process ); release_object( process );
} }
} }
@ -420,17 +479,19 @@ DECL_HANDLER(debug_process)
DECL_HANDLER(send_debug_event) DECL_HANDLER(send_debug_event)
{ {
struct thread *debugger = current->process->debugger; struct thread *debugger = current->process->debugger;
struct debug_event *event;
assert( !current->debug_event );
if ((req->code <= 0) || (req->code > RIP_EVENT)) if ((req->code <= 0) || (req->code > RIP_EVENT))
{ {
fatal_protocol_error( current, "send_debug_event: bad code %d\n", req->code ); fatal_protocol_error( current, "send_debug_event: bad code %d\n", req->code );
return; return;
} }
req->status = 0; req->status = 0;
if (debugger && queue_debug_event( debugger, current, req->code, req + 1 )) if (debugger && ((event = queue_debug_event( debugger, current, req->code, req + 1 ))))
{ {
/* wait for continue_debug_event */ /* wait for continue_debug_event */
current->state = SLEEPING; struct object *obj = &event->obj;
sleep_on( 1, &obj, 0, -1, build_send_event_reply );
release_object( event );
} }
} }