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gdb: fix darwin-nat.c build / adapt to multi-target

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The darwin-nat.c file doesn't build since the multi-target changes
(5b6d1e4f, "Multi-target support").  This patch makes it build.  I have
access to a macOS vm, so I am able to build it, but I wasn't able to
successfully codesign it and try to actually debug something, so I don't
know if it works.  I don't have much more time to put on this to figure
it out, so I thought I'd sent the patch anyway, as it's at least a step
in the right direction.

The bulk of the patch is to change a bunch of functions to be methods of
the darwin_nat_target object, so that this can pass `this` to
find_inferior_ptid and other functions that now require a
process_stratum_target pointer.

The darwin_ptrace_him function (renamed to darwin_nat_target::ptrace_him
in this patch) is passed to fork_inferior as the `init_trace_fun`
parameter.  Since the method can't be passed as a plain function pointer
(we need the `this` pointer), I changed the `init_trace_fun` parameter
of fork_inferior to be a gdb::function_view, so we can pass a lambda and
capture `this`.

The changes in darwin-nat.h are only to move definition higher in the
file, so that forward declarations are not needed.

gdb/ChangeLog:

	* darwin-nat.h (struct darwin_exception_msg, enum
	darwin_msg_state, struct darwin_thread_info, darwin_thread_t):
	Move up.
	(class darwin_nat_target) <wait_1, check_new_threads,
	decode_exception_message, decode_message, stop_inferior,
	init_thread_list, ptrace_him, cancel_breakpoint>: Declare.
	* darwin-nat.c (darwin_check_new_threads): Rename to...
	(darwin_nat_target::check_new_threads): ... this.
	(darwin_suspend_inferior_it): Remove.
	(darwin_decode_exception_message): Rename to...
	(darwin_nat_target::decode_exception_message): ... this.
	(darwin_nat_target::resume): Pass target to find_inferior_ptid.
	(darwin_decode_message): Rename to...
	(darwin_nat_target::decode_message): ... this.
	(cancel_breakpoint): Rename to...
	(darwin_nat_target::cancel_breakpoint): ... this.
	(darwin_wait): Rename to...
	(darwin_nat_target::wait_1): ... this.  Use range-based for loop
	instead of iterate_over_inferiors.
	(darwin_nat_target::wait): Call wait_1 instead of darwin_wait.
	(darwin_stop_inferior): Rename to...
	(darwin_nat_target::stop_inferior): ... this.
	(darwin_nat_target::kill): Call wait_1 instead of darwin_wait.
	(darwin_init_thread_list): Rename to...
	(darwin_nat_target::init_thread_list): ... this.
	(darwin_ptrace_him): Rename to...
	(darwin_nat_target::ptrace_him): ... this.
	(darwin_nat_target::create_inferior): Pass lambda function to
	fork_inferior.
	(darwin_nat_target::detach): Call stop_inferior instead of
	darwin_stop_inferior.
	* fork-inferior.h (fork_inferior): Change init_trace_fun
	parameter to gdb::function_view.
	* fork-inferior.c (fork_inferior): Likewise.
This commit is contained in:
Simon Marchi 2020-01-23 14:55:50 -05:00
parent c162ed3e66
commit e7eee665a1
5 changed files with 169 additions and 118 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
gdb/ChangeLog
View File

@ -1,3 +1,40 @@
2020-01-23 Simon Marchi <simon.marchi@efficios.com>
* darwin-nat.h (struct darwin_exception_msg, enum
darwin_msg_state, struct darwin_thread_info, darwin_thread_t):
Move up.
(class darwin_nat_target) <wait_1, check_new_threads,
decode_exception_message, decode_message, stop_inferior,
init_thread_list, ptrace_him, cancel_breakpoint>: Declare.
* darwin-nat.c (darwin_check_new_threads): Rename to...
(darwin_nat_target::check_new_threads): ... this.
(darwin_suspend_inferior_it): Remove.
(darwin_decode_exception_message): Rename to...
(darwin_nat_target::decode_exception_message): ... this.
(darwin_nat_target::resume): Pass target to find_inferior_ptid.
(darwin_decode_message): Rename to...
(darwin_nat_target::decode_message): ... this.
(cancel_breakpoint): Rename to...
(darwin_nat_target::cancel_breakpoint): ... this.
(darwin_wait): Rename to...
(darwin_nat_target::wait_1): ... this. Use range-based for loop
instead of iterate_over_inferiors.
(darwin_nat_target::wait): Call wait_1 instead of darwin_wait.
(darwin_stop_inferior): Rename to...
(darwin_nat_target::stop_inferior): ... this.
(darwin_nat_target::kill): Call wait_1 instead of darwin_wait.
(darwin_init_thread_list): Rename to...
(darwin_nat_target::init_thread_list): ... this.
(darwin_ptrace_him): Rename to...
(darwin_nat_target::ptrace_him): ... this.
(darwin_nat_target::create_inferior): Pass lambda function to
fork_inferior.
(darwin_nat_target::detach): Call stop_inferior instead of
darwin_stop_inferior.
* fork-inferior.h (fork_inferior): Change init_trace_fun
parameter to gdb::function_view.
* fork-inferior.c (fork_inferior): Likewise.
2020-01-23 Hannes Domani <ssbssa@yahoo.de>
* i386-cygwin-tdep.c (core_process_module_section): Update.

103
gdb/darwin-nat.c
View File

@ -89,12 +89,8 @@
#define PTRACE(CMD, PID, ADDR, SIG) \
darwin_ptrace(#CMD, CMD, (PID), (ADDR), (SIG))
static ptid_t darwin_wait (ptid_t ptid, struct target_waitstatus *status);
static void darwin_ptrace_me (void);
static void darwin_ptrace_him (int pid);
static void darwin_encode_reply (mig_reply_error_t *reply,
mach_msg_header_t *hdr, integer_t code);
@ -258,8 +254,8 @@ cmp_thread_t (const void *l, const void *r)
return (int)(tl - tr);
}
static void
darwin_check_new_threads (struct inferior *inf)
void
darwin_nat_target::check_new_threads (inferior *inf)
{
kern_return_t kret;
thread_array_t thread_list;
@ -355,7 +351,7 @@ darwin_check_new_threads (struct inferior *inf)
pti->msg_state = DARWIN_RUNNING;
/* Add the new thread. */
add_thread_with_info (ptid_t (inf->pid, 0, new_id), pti);
add_thread_with_info (this, ptid_t (inf->pid, 0, new_id), pti);
new_thread_vec.push_back (pti);
new_ix++;
continue;
@ -364,7 +360,7 @@ darwin_check_new_threads (struct inferior *inf)
{
/* A thread was removed. */
struct thread_info *thr
= find_thread_ptid (ptid_t (inf->pid, 0, old_id));
= find_thread_ptid (this, ptid_t (inf->pid, 0, old_id));
delete_thread (thr);
kret = mach_port_deallocate (gdb_task, old_id);
MACH_CHECK_ERROR (kret);
@ -464,14 +460,6 @@ darwin_resume_inferior (struct inferior *inf)
/* Iterator functions. */
static int
darwin_suspend_inferior_it (struct inferior *inf, void *arg)
{
darwin_suspend_inferior (inf);
darwin_check_new_threads (inf);
return 0;
}
static int
darwin_resume_inferior_it (struct inferior *inf, void *arg)
{
@ -611,10 +599,10 @@ darwin_check_message_ndr (NDR_record_t *ndr)
/* Decode an exception message. */
static int
darwin_decode_exception_message (mach_msg_header_t *hdr,
struct inferior **pinf,
darwin_thread_t **pthread)
int
darwin_nat_target::decode_exception_message (mach_msg_header_t *hdr,
inferior **pinf,
darwin_thread_t **pthread)
{
mach_msg_body_t *bod = (mach_msg_body_t*)(hdr + 1);
mach_msg_port_descriptor_t *desc = (mach_msg_port_descriptor_t *)(bod + 1);
@ -712,7 +700,7 @@ darwin_decode_exception_message (mach_msg_header_t *hdr,
/* Find thread by port. */
/* Check for new threads. Do it early so that the port in the exception
message can be deallocated. */
darwin_check_new_threads (inf);
check_new_threads (inf);
/* Free the thread port (as gdb knows the thread, it has already has a right
for it, so this just decrement a reference counter). */
@ -975,7 +963,7 @@ darwin_nat_target::resume (ptid_t ptid, int step, enum gdb_signal signal)
}
else
{
struct inferior *inf = find_inferior_ptid (ptid);
inferior *inf = find_inferior_ptid (this, ptid);
long tid = ptid.tid ();
/* Stop the inferior (should be useless). */
@ -1001,11 +989,11 @@ darwin_nat_target::resume (ptid_t ptid, int step, enum gdb_signal signal)
}
}
static ptid_t
darwin_decode_message (mach_msg_header_t *hdr,
darwin_thread_t **pthread,
struct inferior **pinf,
struct target_waitstatus *status)
ptid_t
darwin_nat_target::decode_message (mach_msg_header_t *hdr,
darwin_thread_t **pthread,
inferior **pinf,
target_waitstatus *status)
{
darwin_thread_t *thread;
struct inferior *inf;
@ -1016,7 +1004,7 @@ darwin_decode_message (mach_msg_header_t *hdr,
int res;
/* Decode message. */
res = darwin_decode_exception_message (hdr, &inf, &thread);
res = decode_exception_message (hdr, &inf, &thread);
if (res < 0)
{
@ -1172,8 +1160,8 @@ darwin_decode_message (mach_msg_header_t *hdr,
return minus_one_ptid;
}
static int
cancel_breakpoint (ptid_t ptid)
int
darwin_nat_target::cancel_breakpoint (ptid_t ptid)
{
/* Arrange for a breakpoint to be hit again later. We will handle
the current event, eventually we will resume this thread, and this
@ -1183,7 +1171,7 @@ cancel_breakpoint (ptid_t ptid)
delete or disable the breakpoint, but the thread will have already
tripped on it. */
struct regcache *regcache = get_thread_regcache (ptid);
struct regcache *regcache = get_thread_regcache (this, ptid);
struct gdbarch *gdbarch = regcache->arch ();
CORE_ADDR pc;
@ -1202,8 +1190,8 @@ cancel_breakpoint (ptid_t ptid)
return 0;
}
static ptid_t
darwin_wait (ptid_t ptid, struct target_waitstatus *status)
ptid_t
darwin_nat_target::wait_1 (ptid_t ptid, struct target_waitstatus *status)
{
kern_return_t kret;
union
@ -1262,7 +1250,7 @@ darwin_wait (ptid_t ptid, struct target_waitstatus *status)
if (darwin_debug_flag > 10)
darwin_dump_message (hdr, darwin_debug_flag > 11);
res = darwin_decode_message (hdr, &thread, &inf, status);
res = decode_message (hdr, &thread, &inf, status);
if (res == minus_one_ptid)
continue;
@ -1273,7 +1261,11 @@ darwin_wait (ptid_t ptid, struct target_waitstatus *status)
while (status->kind == TARGET_WAITKIND_IGNORE);
/* Stop all tasks. */
iterate_over_inferiors (darwin_suspend_inferior_it, NULL);
for (inferior *inf : all_inferiors (this))
{
darwin_suspend_inferior (inf);
check_new_threads (inf);
}
/* Read pending messages. */
while (1)
@ -1298,7 +1290,7 @@ darwin_wait (ptid_t ptid, struct target_waitstatus *status)
if (darwin_debug_flag > 10)
darwin_dump_message (hdr, darwin_debug_flag > 11);
ptid2 = darwin_decode_message (hdr, &thread, &inf, &status2);
ptid2 = decode_message (hdr, &thread, &inf, &status2);
if (inf != NULL && thread != NULL
&& thread->event.ex_type == EXC_BREAKPOINT)
@ -1325,7 +1317,7 @@ ptid_t
darwin_nat_target::wait (ptid_t ptid, struct target_waitstatus *status,
int options)
{
return darwin_wait (ptid, status);
return wait_1 (ptid, status);
}
void
@ -1415,8 +1407,8 @@ darwin_reply_to_all_pending_messages (struct inferior *inf)
}
}
static void
darwin_stop_inferior (struct inferior *inf)
void
darwin_nat_target::stop_inferior (inferior *inf)
{
struct target_waitstatus wstatus;
ptid_t ptid;
@ -1432,14 +1424,14 @@ darwin_stop_inferior (struct inferior *inf)
if (priv->no_ptrace)
return;
res = kill (inf->pid, SIGSTOP);
res = ::kill (inf->pid, SIGSTOP);
if (res != 0)
warning (_("cannot kill: %s"), safe_strerror (errno));
/* Wait until the process is really stopped. */
while (1)
{
ptid = darwin_wait (inferior_ptid, &wstatus);
ptid = wait_1 (inferior_ptid, &wstatus);
if (wstatus.kind == TARGET_WAITKIND_STOPPED
&& wstatus.value.sig == GDB_SIGNAL_STOP)
break;
@ -1564,7 +1556,7 @@ darwin_nat_target::kill ()
darwin_resume_inferior (inf);
ptid = darwin_wait (inferior_ptid, &wstatus);
ptid = wait_1 (inferior_ptid, &wstatus);
}
else if (errno != ESRCH)
warning (_("Failed to kill inferior: kill (%d, 9) returned [%s]"),
@ -1716,10 +1708,10 @@ thread_info_from_private_thread_info (darwin_thread_info *pti)
gdb_assert_not_reached ("did not find gdb thread for darwin thread");
}
static void
darwin_init_thread_list (struct inferior *inf)
void
darwin_nat_target::init_thread_list (inferior *inf)
{
darwin_check_new_threads (inf);
check_new_threads (inf);
darwin_inferior *priv = get_darwin_inferior (inf);
@ -1783,21 +1775,21 @@ darwin_pre_ptrace (void)
mark_fd_no_cloexec (ptrace_fds[1]);
}
static void
darwin_ptrace_him (int pid)
void
darwin_nat_target::ptrace_him (int pid)
{
struct inferior *inf = current_inferior ();
darwin_attach_pid (inf);
/* Let's the child run. */
close (ptrace_fds[0]);
close (ptrace_fds[1]);
::close (ptrace_fds[0]);
::close (ptrace_fds[1]);
unmark_fd_no_cloexec (ptrace_fds[0]);
unmark_fd_no_cloexec (ptrace_fds[1]);
darwin_init_thread_list (inf);
init_thread_list (inf);
gdb_startup_inferior (pid, START_INFERIOR_TRAPS_EXPECTED);
}
@ -1986,6 +1978,7 @@ darwin_nat_target::create_inferior (const char *exec_file,
char **env, int from_tty)
{
gdb::optional<scoped_restore_tmpl<bool>> restore_startup_with_shell;
darwin_nat_target *the_target = this;
if (startup_with_shell && may_have_sip ())
{
@ -1998,7 +1991,11 @@ darwin_nat_target::create_inferior (const char *exec_file,
/* Do the hard work. */
fork_inferior (exec_file, allargs, env, darwin_ptrace_me,
darwin_ptrace_him, darwin_pre_ptrace, copied_shell,
[the_target] (int pid)
{
the_target->ptrace_him (pid);
},
darwin_pre_ptrace, copied_shell,
darwin_execvp);
}
@ -2068,7 +2065,7 @@ darwin_nat_target::attach (const char *args, int from_tty)
darwin_suspend_inferior (inf);
darwin_init_thread_list (inf);
init_thread_list (inf);
darwin_inferior *priv = get_darwin_inferior (inf);
@ -2099,7 +2096,7 @@ darwin_nat_target::detach (inferior *inf, int from_tty)
/* If ptrace() is in use, stop the process. */
if (!priv->no_ptrace)
darwin_stop_inferior (inf);
stop_inferior (inf);
kret = darwin_restore_exception_ports (priv);
MACH_CHECK_ERROR (kret);

139
gdb/darwin-nat.h
View File

@ -21,68 +21,6 @@
#include <mach/mach.h>
#include "gdbthread.h"
/* This needs to be overridden by the platform specific nat code. */
class darwin_nat_target : public inf_child_target
{
void create_inferior (const char *exec_file,
const std::string &allargs,
char **env, int from_tty) override;
void attach (const char *, int) override;
void detach (inferior *, int) override;
ptid_t wait (ptid_t, struct target_waitstatus *, int) override;
void mourn_inferior () override;
void kill () override;
void interrupt () override;
void resume (ptid_t, int , enum gdb_signal) override;
bool thread_alive (ptid_t ptid) override;
std::string pid_to_str (ptid_t) override;
char *pid_to_exec_file (int pid) override;
enum target_xfer_status xfer_partial (enum target_object object,
const char *annex,
gdb_byte *readbuf,
const gdb_byte *writebuf,
ULONGEST offset, ULONGEST len,
ULONGEST *xfered_len) override;
bool supports_multi_process () override;
ptid_t get_ada_task_ptid (long lwp, long thread) override;
};
/* Describe the mach exception handling state for a task. This state is saved
before being changed and restored when a process is detached.
For more information on these fields see task_get_exception_ports manual
page. */
struct darwin_exception_info
{
/* Exceptions handled by the port. */
exception_mask_t masks[EXC_TYPES_COUNT] {};
/* Ports receiving exception messages. */
mach_port_t ports[EXC_TYPES_COUNT] {};
/* Type of messages sent. */
exception_behavior_t behaviors[EXC_TYPES_COUNT] {};
/* Type of state to be sent. */
thread_state_flavor_t flavors[EXC_TYPES_COUNT] {};
/* Number of elements set. */
mach_msg_type_number_t count = 0;
};
struct darwin_exception_msg
{
mach_msg_header_t header;
@ -136,6 +74,83 @@ struct darwin_thread_info : public private_thread_info
};
typedef struct darwin_thread_info darwin_thread_t;
/* This needs to be overridden by the platform specific nat code. */
class darwin_nat_target : public inf_child_target
{
void create_inferior (const char *exec_file,
const std::string &allargs,
char **env, int from_tty) override;
void attach (const char *, int) override;
void detach (inferior *, int) override;
ptid_t wait (ptid_t, struct target_waitstatus *, int) override;
void mourn_inferior () override;
void kill () override;
void interrupt () override;
void resume (ptid_t, int , enum gdb_signal) override;
bool thread_alive (ptid_t ptid) override;
std::string pid_to_str (ptid_t) override;
char *pid_to_exec_file (int pid) override;
enum target_xfer_status xfer_partial (enum target_object object,
const char *annex,
gdb_byte *readbuf,
const gdb_byte *writebuf,
ULONGEST offset, ULONGEST len,
ULONGEST *xfered_len) override;
bool supports_multi_process () override;
ptid_t get_ada_task_ptid (long lwp, long thread) override;
private:
ptid_t wait_1 (ptid_t, struct target_waitstatus *);
void check_new_threads (inferior *inf);
int decode_exception_message (mach_msg_header_t *hdr,
inferior **pinf,
darwin_thread_t **pthread);
ptid_t decode_message (mach_msg_header_t *hdr,
darwin_thread_t **pthread,
inferior **pinf,
target_waitstatus *status);
void stop_inferior (inferior *inf);
void init_thread_list (inferior *inf);
void ptrace_him (int pid);
int cancel_breakpoint (ptid_t ptid);
};
/* Describe the mach exception handling state for a task. This state is saved
before being changed and restored when a process is detached.
For more information on these fields see task_get_exception_ports manual
page. */
struct darwin_exception_info
{
/* Exceptions handled by the port. */
exception_mask_t masks[EXC_TYPES_COUNT] {};
/* Ports receiving exception messages. */
mach_port_t ports[EXC_TYPES_COUNT] {};
/* Type of messages sent. */
exception_behavior_t behaviors[EXC_TYPES_COUNT] {};
/* Type of state to be sent. */
thread_state_flavor_t flavors[EXC_TYPES_COUNT] {};
/* Number of elements set. */
mach_msg_type_number_t count = 0;
};
static inline darwin_thread_info *
get_darwin_thread_info (class thread_info *thread)
{

5
gdb/nat/fork-inferior.c
View File

@ -267,7 +267,8 @@ execv_argv::init_for_shell (const char *exec_file,
pid_t
fork_inferior (const char *exec_file_arg, const std::string &allargs,
char **env, void (*traceme_fun) (),
void (*init_trace_fun) (int), void (*pre_trace_fun) (),
gdb::function_view<void (int)> init_trace_fun,
void (*pre_trace_fun) (),
const char *shell_file_arg,
void (*exec_fun)(const char *file, char * const *argv,
char * const *env))
@ -439,7 +440,7 @@ fork_inferior (const char *exec_file_arg, const std::string &allargs,
initialize anything target-vector-specific that needs
initializing. */
if (init_trace_fun)
(*init_trace_fun) (pid);
init_trace_fun (pid);
/* We are now in the child process of interest, having exec'd the
correct program, and are poised at the first instruction of the

3
gdb/nat/fork-inferior.h
View File

@ -21,6 +21,7 @@
#define NAT_FORK_INFERIOR_H
#include <string>
#include "gdbsupport/function-view.h"
struct process_stratum_target;
@ -42,7 +43,7 @@ struct process_stratum_target;
extern pid_t fork_inferior (const char *exec_file_arg,
const std::string &allargs,
char **env, void (*traceme_fun) (),
void (*init_trace_fun) (int),
gdb::function_view<void (int)> init_trace_fun,
void (*pre_trace_fun) (),
const char *shell_file_arg,
void (*exec_fun) (const char *file,