[PATCH v2 3/4] gdb/progspace: add solib_ops pointer in program_space
Simon Marchi
simon.marchi@efficios.com
Mon Jun 9 19:40:57 GMT 2025
New in v2: remove commented out code in target.c and spurious change in
gdb.mi/mi-detach.exp.
The subsequent C++ification patch in this series will allocate one
instance of solib_ops per program space. That instance will be held in
struct program_space. As a small step towards this, add an `solib_ops
*` field to `struct program_space`. This field represents the solib_ops
currently used to manage the solibs in that program space. Initialize
it with the result of `gdbarch_so_ops` in `post_create_inferior`, and
use it whenever we need to do some solib stuff, rather than using
`gdbarch_so_ops` directly.
The difficulty here is knowing when exactly to set and unset the solib
ops. What I have here passes the testsuite on Linux, but with more
testing we will probably discover more spots where it's needed.
The C++ification patch will turn this field into a unique pointer.
Change-Id: Ide8ddc57328895720fcd645d46dc34491f84c656
---
gdb/corelow.c | 2 +-
gdb/infcmd.c | 15 ++++++++-------
gdb/inferior.h | 9 ++++++++-
gdb/infrun.c | 11 +++++++++--
gdb/progspace.h | 20 ++++++++++++++++++++
gdb/solib.c | 44 +++++++++++++++++++++++--------------------
gdb/target.c | 1 +
gdb/tracectf.c | 2 +-
gdb/tracefile-tfile.c | 2 +-
9 files changed, 73 insertions(+), 33 deletions(-)
diff --git a/gdb/corelow.c b/gdb/corelow.c
index b5895de9e9c6..d92585c67bfd 100644
--- a/gdb/corelow.c
+++ b/gdb/corelow.c
@@ -1180,7 +1180,7 @@ core_target_open (const char *arg, int from_tty)
if (current_program_space->exec_bfd () == nullptr)
set_gdbarch_from_file (current_program_space->core_bfd ());
- post_create_inferior (from_tty);
+ post_create_inferior (from_tty, true);
/* Now go through the target stack looking for threads since there
may be a thread_stratum target loaded on top of target core by
diff --git a/gdb/infcmd.c b/gdb/infcmd.c
index e9b58ce55210..1adad5c3eaa3 100644
--- a/gdb/infcmd.c
+++ b/gdb/infcmd.c
@@ -224,14 +224,11 @@ strip_bg_char (const char *args, int *bg_char_p)
return make_unique_xstrdup (args);
}
-/* Common actions to take after creating any sort of inferior, by any
- means (running, attaching, connecting, et cetera). The target
- should be stopped. */
+/* See inferior.h. */
void
-post_create_inferior (int from_tty)
+post_create_inferior (int from_tty, bool set_pspace_solib_ops)
{
-
/* Be sure we own the terminal in case write operations are performed. */
target_terminal::ours_for_output ();
@@ -261,6 +258,10 @@ post_create_inferior (int from_tty)
throw;
}
+ if (set_pspace_solib_ops)
+ current_program_space->set_solib_ops
+ (*gdbarch_so_ops (current_inferior ()->arch ()));
+
if (current_program_space->exec_bfd ())
{
const unsigned solib_add_generation
@@ -482,7 +483,7 @@ run_command_1 (const char *args, int from_tty, enum run_how run_how)
/* Pass zero for FROM_TTY, because at this point the "run" command
has done its thing; now we are setting up the running program. */
- post_create_inferior (0);
+ post_create_inferior (0, true);
/* Queue a pending event so that the program stops immediately. */
if (run_how == RUN_STOP_AT_FIRST_INSN)
@@ -2506,7 +2507,7 @@ setup_inferior (int from_tty)
/* Take any necessary post-attaching actions for this platform. */
target_post_attach (inferior_ptid.pid ());
- post_create_inferior (from_tty);
+ post_create_inferior (from_tty, true);
}
/* What to do after the first program stops after attaching. */
diff --git a/gdb/inferior.h b/gdb/inferior.h
index 54f5229b420f..fe94e289bdc7 100644
--- a/gdb/inferior.h
+++ b/gdb/inferior.h
@@ -213,7 +213,14 @@ extern ptid_t gdb_startup_inferior (pid_t pid, int num_traps);
extern void setup_inferior (int from_tty);
-extern void post_create_inferior (int from_tty);
+/* Common actions to take after creating any sort of inferior, by any
+ means (running, attaching, connecting, et cetera). The target
+ should be stopped.
+
+ If SET_PSPACE_SOLIB_OPS is true, initialize the program space's solib
+ provider using the current inferior's architecture. */
+
+extern void post_create_inferior (int from_tty, bool set_pspace_solib_ops);
extern void attach_command (const char *, int);
diff --git a/gdb/infrun.c b/gdb/infrun.c
index 2e02642c52a4..5cdf66d26dcb 100644
--- a/gdb/infrun.c
+++ b/gdb/infrun.c
@@ -472,6 +472,7 @@ holding the child stopped. Try \"set %ps\" or \"%ps\".\n"),
inferior *parent_inf = current_inferior ();
inferior *child_inf = nullptr;
+ bool child_has_new_pspace = false;
gdb_assert (parent_inf->thread_waiting_for_vfork_done == nullptr);
@@ -536,6 +537,7 @@ holding the child stopped. Try \"set %ps\" or \"%ps\".\n"),
else
{
child_inf->pspace = new program_space (new_address_space ());
+ child_has_new_pspace = true;
child_inf->aspace = child_inf->pspace->aspace;
child_inf->removable = true;
clone_program_space (child_inf->pspace, parent_inf->pspace);
@@ -625,6 +627,7 @@ holding the child stopped. Try \"set %ps\" or \"%ps\".\n"),
else
{
child_inf->pspace = new program_space (new_address_space ());
+ child_has_new_pspace = true;
child_inf->aspace = child_inf->pspace->aspace;
child_inf->removable = true;
child_inf->symfile_flags = SYMFILE_NO_READ;
@@ -723,7 +726,8 @@ holding the child stopped. Try \"set %ps\" or \"%ps\".\n"),
maybe_restore.emplace ();
switch_to_thread (*child_inf->threads ().begin ());
- post_create_inferior (0);
+
+ post_create_inferior (0, child_has_new_pspace);
}
return false;
@@ -1321,6 +1325,7 @@ follow_exec (ptid_t ptid, const char *exec_file_target)
we don't want those to be satisfied by the libraries of the
previous incarnation of this process. */
no_shared_libraries (current_program_space);
+ current_program_space->unset_solib_ops ();
inferior *execing_inferior = current_inferior ();
inferior *following_inferior;
@@ -1377,6 +1382,8 @@ follow_exec (ptid_t ptid, const char *exec_file_target)
registers. */
target_find_description ();
+ current_program_space->set_solib_ops
+ (*gdbarch_so_ops (following_inferior->arch ()));
gdb::observers::inferior_execd.notify (execing_inferior, following_inferior);
breakpoint_re_set ();
@@ -3818,7 +3825,7 @@ start_remote (int from_tty)
/* Now that the inferior has stopped, do any bookkeeping like
loading shared libraries. We want to do this before normal_stop,
so that the displayed frame is up to date. */
- post_create_inferior (from_tty);
+ post_create_inferior (from_tty, true);
normal_stop ();
}
diff --git a/gdb/progspace.h b/gdb/progspace.h
index 5e5d5edd9b4b..abb448195d74 100644
--- a/gdb/progspace.h
+++ b/gdb/progspace.h
@@ -231,6 +231,23 @@ struct program_space
is outside all objfiles in this progspace. */
struct objfile *objfile_for_address (CORE_ADDR address);
+ /* Set this program space's solib provider.
+
+ The solib provider must be unset prior to call this method. */
+ void set_solib_ops (const struct solib_ops &ops)
+ {
+ gdb_assert (m_solib_ops == nullptr);
+ m_solib_ops = &ops;
+ };
+
+ /* Unset this program space's solib provider. */
+ void unset_solib_ops ()
+ { m_solib_ops = nullptr; }
+
+ /* Get this program space's solib provider. */
+ const struct solib_ops *solib_ops () const
+ { return m_solib_ops; }
+
/* Return the list of all the solibs in this program space. */
owning_intrusive_list<solib> &solibs ()
{ return m_solib_list; }
@@ -355,6 +372,9 @@ struct program_space
/* All known objfiles are kept in a linked list. */
owning_intrusive_list<objfile> m_objfiles_list;
+ /* solib_ops implementation used to provide solibs in this program space. */
+ const struct solib_ops *m_solib_ops = nullptr;
+
/* List of shared objects mapped into this space. Managed by
solib.c. */
owning_intrusive_list<solib> m_solib_list;
diff --git a/gdb/solib.c b/gdb/solib.c
index de3469da6e91..dceab2b865bf 100644
--- a/gdb/solib.c
+++ b/gdb/solib.c
@@ -707,7 +707,10 @@ notify_solib_unloaded (program_space *pspace, const solib &so,
void
update_solib_list (int from_tty)
{
- const solib_ops *ops = gdbarch_so_ops (current_inferior ()->arch ());
+ const solib_ops *ops = current_program_space->solib_ops ();
+
+ if (ops == nullptr)
+ return;
/* We can reach here due to changing solib-search-path or the
sysroot, before having any inferior. */
@@ -1021,7 +1024,7 @@ print_solib_list_table (std::vector<const solib *> solib_list,
gdbarch *gdbarch = current_inferior ()->arch ();
/* "0x", a little whitespace, and two hex digits per byte of pointers. */
int addr_width = 4 + (gdbarch_ptr_bit (gdbarch) / 4);
- const solib_ops *ops = gdbarch_so_ops (gdbarch);
+ const solib_ops *ops = current_program_space->solib_ops ();
struct ui_out *uiout = current_uiout;
bool so_missing_debug_info = false;
@@ -1155,7 +1158,8 @@ info_sharedlibrary_command (const char *pattern, int from_tty)
static void
info_linker_namespace_command (const char *pattern, int from_tty)
{
- const solib_ops *ops = gdbarch_so_ops (current_inferior ()->arch ());
+ const solib_ops *ops = current_program_space->solib_ops ();
+
/* This command only really makes sense for inferiors that support
linker namespaces, so we can leave early. */
if (ops->num_active_namespaces == nullptr)
@@ -1273,9 +1277,9 @@ solib_name_from_address (struct program_space *pspace, CORE_ADDR address)
bool
solib_keep_data_in_core (CORE_ADDR vaddr, unsigned long size)
{
- const solib_ops *ops = gdbarch_so_ops (current_inferior ()->arch ());
+ const solib_ops *ops = current_program_space->solib_ops ();
- if (ops->keep_data_in_core)
+ if (ops != nullptr && ops->keep_data_in_core != nullptr)
return ops->keep_data_in_core (vaddr, size) != 0;
else
return false;
@@ -1286,8 +1290,6 @@ solib_keep_data_in_core (CORE_ADDR vaddr, unsigned long size)
void
clear_solib (program_space *pspace)
{
- const solib_ops *ops = gdbarch_so_ops (current_inferior ()->arch ());
-
for (solib &so : pspace->solibs ())
{
bool still_in_use
@@ -1299,7 +1301,9 @@ clear_solib (program_space *pspace)
pspace->solibs ().clear ();
- if (ops->clear_solib != nullptr)
+ const solib_ops *ops = pspace->solib_ops ();
+
+ if (ops != nullptr && ops->clear_solib != nullptr)
ops->clear_solib (pspace);
}
@@ -1311,9 +1315,9 @@ clear_solib (program_space *pspace)
void
solib_create_inferior_hook (int from_tty)
{
- const solib_ops *ops = gdbarch_so_ops (current_inferior ()->arch ());
+ const solib_ops *ops = current_program_space->solib_ops ();
- if (ops->solib_create_inferior_hook != nullptr)
+ if (ops != nullptr && ops->solib_create_inferior_hook != nullptr)
ops->solib_create_inferior_hook (from_tty);
}
@@ -1322,10 +1326,10 @@ solib_create_inferior_hook (int from_tty)
bool
in_solib_dynsym_resolve_code (CORE_ADDR pc)
{
- const auto in_dynsym_resolve_code
- = gdbarch_so_ops (current_inferior ()->arch ())->in_dynsym_resolve_code;
+ const solib_ops *ops = current_program_space->solib_ops ();
- return in_dynsym_resolve_code && in_dynsym_resolve_code (pc);
+ return (ops != nullptr && ops->in_dynsym_resolve_code != nullptr
+ && ops->in_dynsym_resolve_code (pc));
}
/* Implements the "sharedlibrary" command. */
@@ -1367,9 +1371,9 @@ no_shared_libraries_command (const char *ignored, int from_tty)
void
update_solib_breakpoints (void)
{
- const solib_ops *ops = gdbarch_so_ops (current_inferior ()->arch ());
+ const solib_ops *ops = current_program_space->solib_ops ();
- if (ops->update_breakpoints != NULL)
+ if (ops != nullptr && ops->update_breakpoints != nullptr)
ops->update_breakpoints ();
}
@@ -1378,9 +1382,9 @@ update_solib_breakpoints (void)
void
handle_solib_event (void)
{
- const solib_ops *ops = gdbarch_so_ops (current_inferior ()->arch ());
+ const solib_ops *ops = current_program_space->solib_ops ();
- if (ops->handle_event != NULL)
+ if (ops != nullptr && ops->handle_event != nullptr)
ops->handle_event ();
current_inferior ()->pspace->clear_solib_cache ();
@@ -1464,8 +1468,6 @@ reload_shared_libraries (const char *ignored, int from_tty,
{
reload_shared_libraries_1 (from_tty);
- const solib_ops *ops = gdbarch_so_ops (current_inferior ()->arch ());
-
/* Creating inferior hooks here has two purposes. First, if we reload
shared libraries then the address of solib breakpoint we've computed
previously might be no longer valid. For example, if we forgot to set
@@ -1477,9 +1479,11 @@ reload_shared_libraries (const char *ignored, int from_tty,
about ld.so. */
if (target_has_execution ())
{
+ const solib_ops *ops = current_program_space->solib_ops ();
+
/* Reset or free private data structures not associated with
solib entries. */
- if (ops->clear_solib != nullptr)
+ if (ops != nullptr && ops->clear_solib != nullptr)
ops->clear_solib (current_program_space);
/* Remove any previous solib event breakpoint. This is usually
diff --git a/gdb/target.c b/gdb/target.c
index 522bed8e939c..7a296572830e 100644
--- a/gdb/target.c
+++ b/gdb/target.c
@@ -2464,6 +2464,7 @@ target_pre_inferior ()
if (!gdbarch_has_global_solist (current_inferior ()->arch ()))
{
no_shared_libraries (current_program_space);
+ current_program_space->unset_solib_ops ();
invalidate_target_mem_regions ();
diff --git a/gdb/tracectf.c b/gdb/tracectf.c
index 1650e676d814..ce0b0079a29e 100644
--- a/gdb/tracectf.c
+++ b/gdb/tracectf.c
@@ -1174,7 +1174,7 @@ ctf_target_open (const char *args, int from_tty)
merge_uploaded_trace_state_variables (&uploaded_tsvs);
merge_uploaded_tracepoints (&uploaded_tps);
- post_create_inferior (from_tty);
+ post_create_inferior (from_tty, true);
}
/* This is the implementation of target_ops method to_close. Destroy
diff --git a/gdb/tracefile-tfile.c b/gdb/tracefile-tfile.c
index 5f8b338df4cc..093b10e51d6e 100644
--- a/gdb/tracefile-tfile.c
+++ b/gdb/tracefile-tfile.c
@@ -567,7 +567,7 @@ tfile_target_open (const char *arg, int from_tty)
merge_uploaded_tracepoints (&uploaded_tps);
- post_create_inferior (from_tty);
+ post_create_inferior (from_tty, true);
}
/* Interpret the given line from the definitions part of the trace
--
2.49.0
More information about the Gdb-patches
mailing list