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594 lines
21 KiB
594 lines
21 KiB
From FEDORA_PATCHES Mon Sep 17 00:00:00 2001
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From: Pedro Alves <pedro@palves.net>
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Date: Fri, 30 Oct 2020 18:26:15 +0100
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Subject: gdb-rhbz1909902-frame_id_p-assert-1.patch
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;; Backport fix for frame_id_p assertion failure (RH BZ 1909902).
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Make scoped_restore_current_thread's cdtors exception free (RFC)
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If the remote target closes while we're reading registers/memory for
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restoring the selected frame in scoped_restore_current_thread's dtor,
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the corresponding TARGET_CLOSE_ERROR error is swallowed by the
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scoped_restore_current_thread's dtor, because letting exceptions
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escape from a dtor is bad. It isn't great to lose that errors like
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that, though. I've been thinking about how to avoid it, and I came up
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with this patch.
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The idea here is to make scoped_restore_current_thread's dtor do as
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little as possible, to avoid any work that might throw in the first
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place. And to do that, instead of having the dtor call
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restore_selected_frame, which re-finds the previously selected frame,
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just record the frame_id/level of the desired selected frame, and have
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get_selected_frame find the frame the next time it is called. In
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effect, this implements most of Cagney's suggestion, here:
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/* On demand, create the selected frame and then return it. If the
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selected frame can not be created, this function prints then throws
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an error. When MESSAGE is non-NULL, use it for the error message,
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otherwize use a generic error message. */
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/* FIXME: cagney/2002-11-28: At present, when there is no selected
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frame, this function always returns the current (inner most) frame.
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It should instead, when a thread has previously had its frame
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selected (but not resumed) and the frame cache invalidated, find
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and then return that thread's previously selected frame. */
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extern struct frame_info *get_selected_frame (const char *message);
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The only thing missing to fully implement that would be to make
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reinit_frame_cache just clear selected_frame instead of calling
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select_frame(NULL), and the call select_frame(NULL) explicitly in the
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places where we really wanted reinit_frame_cache to go back to the
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current frame too. That can done separately, though, I'm not
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proposing to do that in this patch.
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Note that this patch renames restore_selected_frame to
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lookup_selected_frame, and adds a new restore_selected_frame function
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that doesn't throw, to be paired with the also-new save_selected_frame
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function.
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There's a restore_selected_frame function in infrun.c that I think can
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be replaced by the new one in frame.c.
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Also done in this patch is make the get_selected_frame's parameter be
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optional, so that we don't have to pass down nullptr explicitly all
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over the place.
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lookup_selected_frame should really move from thread.c to frame.c, but
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I didn't do that here, just to avoid churn in the patch while it
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collects comments. I did make it extern and declared it in frame.h
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already, preparing for the move. I will do the move as a follow up
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patch if people agree with this approach.
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Incidentally, this patch alone would fix the crashes fixed by the
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previous patches in the series, because with this,
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scoped_restore_current_thread's constructor doesn't throw either.
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gdb/ChangeLog:
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* blockframe.c (block_innermost_frame): Use get_selected_frame.
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* frame.c
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(scoped_restore_selected_frame::scoped_restore_selected_frame):
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Use save_selected_frame. Save language as well.
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(scoped_restore_selected_frame::~scoped_restore_selected_frame):
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Use restore_selected_frame, and restore language as well.
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(selected_frame_id, selected_frame_level): New.
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(selected_frame): Update comments.
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(save_selected_frame, restore_selected_frame): New.
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(get_selected_frame): Use lookup_selected_frame.
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(get_selected_frame_if_set): Delete.
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(select_frame): Record selected_frame_level and selected_frame_id.
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* frame.h (scoped_restore_selected_frame) <m_level, m_lang>: New
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fields.
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(get_selected_frame): Make 'message' parameter optional.
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(get_selected_frame_if_set): Delete declaration.
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(select_frame): Update comments.
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(save_selected_frame, restore_selected_frame)
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(lookup_selected_frame): Declare.
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* gdbthread.h (scoped_restore_current_thread) <m_lang>: New field.
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* infrun.c (struct infcall_control_state) <selected_frame_level>:
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New field.
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(save_infcall_control_state): Use save_selected_frame.
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(restore_selected_frame): Delete.
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(restore_infcall_control_state): Use restore_selected_frame.
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* stack.c (select_frame_command_core, frame_command_core): Use
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get_selected_frame.
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* thread.c (restore_selected_frame): Rename to ...
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(lookup_selected_frame): ... this and make extern. Select the
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current frame if the frame level is -1.
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(scoped_restore_current_thread::restore): Also restore the
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language.
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(scoped_restore_current_thread::~scoped_restore_current_thread):
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Don't try/catch.
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(scoped_restore_current_thread::scoped_restore_current_thread):
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Save the language as well. Use save_selected_frame.
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Change-Id: I73fd1cfc40d8513c28e5596383b7ecd8bcfe700f
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diff --git a/gdb/blockframe.c b/gdb/blockframe.c
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--- a/gdb/blockframe.c
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+++ b/gdb/blockframe.c
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@@ -464,14 +464,10 @@ find_gnu_ifunc_target_type (CORE_ADDR resolver_funaddr)
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struct frame_info *
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block_innermost_frame (const struct block *block)
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{
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- struct frame_info *frame;
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-
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if (block == NULL)
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return NULL;
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- frame = get_selected_frame_if_set ();
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- if (frame == NULL)
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- frame = get_current_frame ();
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+ frame_info *frame = get_selected_frame ();
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while (frame != NULL)
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{
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const struct block *frame_block = get_frame_block (frame, NULL);
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diff --git a/gdb/frame.c b/gdb/frame.c
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--- a/gdb/frame.c
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+++ b/gdb/frame.c
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@@ -317,17 +317,15 @@ frame_stash_invalidate (void)
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/* See frame.h */
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scoped_restore_selected_frame::scoped_restore_selected_frame ()
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{
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- m_fid = get_frame_id (get_selected_frame (NULL));
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+ m_lang = current_language->la_language;
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+ save_selected_frame (&m_fid, &m_level);
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}
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/* See frame.h */
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scoped_restore_selected_frame::~scoped_restore_selected_frame ()
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{
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- frame_info *frame = frame_find_by_id (m_fid);
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- if (frame == NULL)
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- warning (_("Unable to restore previously selected frame."));
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- else
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- select_frame (frame);
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+ restore_selected_frame (m_fid, m_level);
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+ set_language (m_lang);
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}
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/* Flag to control debugging. */
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@@ -1685,10 +1683,63 @@ get_current_frame (void)
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}
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/* The "selected" stack frame is used by default for local and arg
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- access. May be zero, for no selected frame. */
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-
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+ access.
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+
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+ The "single source of truth" for the selected frame is the
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+ SELECTED_FRAME_ID / SELECTED_FRAME_LEVEL pair.
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+
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+ Frame IDs can be saved/restored across reinitializing the frame
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+ cache, while frame_info pointers can't (frame_info objects are
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+ invalidated). If we know the corresponding frame_info object, it
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+ is cached in SELECTED_FRAME.
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+
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+ If SELECTED_FRAME_ID / SELECTED_FRAME_LEVEL are null_frame_id / -1,
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+ and the target has stack and is stopped, the selected frame is the
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+ current (innermost) frame. This means that SELECTED_FRAME_LEVEL is
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+ never 0 and SELECTED_FRAME_ID is never the ID of the innermost
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+ frame.
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+
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+ If SELECTED_FRAME_ID / SELECTED_FRAME_LEVEL are null_frame_id / -1,
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+ and the target has no stack or is executing, then there's no
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+ selected frame. */
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+static frame_id selected_frame_id = null_frame_id;
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+static int selected_frame_level = -1;
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+
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+/* The cached frame_info object pointing to the selected frame.
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+ Looked up on demand by get_selected_frame. */
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static struct frame_info *selected_frame;
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+/* See frame.h. */
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+
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+void
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+save_selected_frame (frame_id *frame_id, int *frame_level)
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+ noexcept
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+{
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+ *frame_id = selected_frame_id;
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+ *frame_level = selected_frame_level;
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+}
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+
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+/* See frame.h. */
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+
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+void
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+restore_selected_frame (frame_id frame_id, int frame_level)
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+ noexcept
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+{
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+ /* save_selected_frame never returns level == 0, so we shouldn't see
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+ it here either. */
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+ gdb_assert (frame_level != 0);
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+
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+ /* FRAME_ID can be null_frame_id only IFF frame_level is -1. */
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+ gdb_assert ((frame_level == -1 && !frame_id_p (frame_id))
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+ || (frame_level != -1 && frame_id_p (frame_id)));
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+
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+ selected_frame_id = frame_id;
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+ selected_frame_level = frame_level;
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+
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+ /* Will be looked up later by get_selected_frame. */
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+ selected_frame = nullptr;
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+}
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+
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bool
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has_stack_frames ()
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{
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@@ -1715,9 +1766,7 @@ has_stack_frames ()
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return true;
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}
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-/* Return the selected frame. Always non-NULL (unless there isn't an
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- inferior sufficient for creating a frame) in which case an error is
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- thrown. */
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+/* See frame.h. */
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struct frame_info *
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get_selected_frame (const char *message)
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@@ -1726,24 +1775,14 @@ get_selected_frame (const char *message)
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{
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if (message != NULL && !has_stack_frames ())
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error (("%s"), message);
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- /* Hey! Don't trust this. It should really be re-finding the
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- last selected frame of the currently selected thread. This,
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- though, is better than nothing. */
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- select_frame (get_current_frame ());
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+
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+ lookup_selected_frame (selected_frame_id, selected_frame_level);
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}
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/* There is always a frame. */
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gdb_assert (selected_frame != NULL);
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return selected_frame;
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}
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-/* If there is a selected frame, return it. Otherwise, return NULL. */
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-
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-struct frame_info *
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-get_selected_frame_if_set (void)
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-{
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- return selected_frame;
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-}
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-
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/* This is a variant of get_selected_frame() which can be called when
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the inferior does not have a frame; in that case it will return
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NULL instead of calling error(). */
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@@ -1756,12 +1795,42 @@ deprecated_safe_get_selected_frame (void)
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return get_selected_frame (NULL);
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}
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-/* Select frame FI (or NULL - to invalidate the current frame). */
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+/* Select frame FI (or NULL - to invalidate the selected frame). */
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void
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select_frame (struct frame_info *fi)
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{
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selected_frame = fi;
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+ selected_frame_level = frame_relative_level (fi);
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+ if (selected_frame_level == 0)
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+ {
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+ /* Treat the current frame especially -- we want to always
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+ save/restore it without warning, even if the frame ID changes
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+ (see lookup_selected_frame). E.g.:
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+
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+ // The current frame is selected, the target had just stopped.
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+ {
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+ scoped_restore_selected_frame restore_frame;
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+ some_operation_that_changes_the_stack ();
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+ }
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+ // scoped_restore_selected_frame's dtor runs, but the
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+ // original frame_id can't be found. No matter whether it
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+ // is found or not, we still end up with the now-current
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+ // frame selected. Warning in lookup_selected_frame in this
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+ // case seems pointless.
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+
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+ Also get_frame_id may access the target's registers/memory,
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+ and thus skipping get_frame_id optimizes the common case.
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+
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+ Saving the selected frame this way makes get_selected_frame
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+ and restore_current_frame return/re-select whatever frame is
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+ the innermost (current) then. */
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+ selected_frame_level = -1;
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+ selected_frame_id = null_frame_id;
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+ }
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+ else
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+ selected_frame_id = get_frame_id (fi);
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+
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/* NOTE: cagney/2002-05-04: FI can be NULL. This occurs when the
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frame is being invalidated. */
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diff --git a/gdb/frame.h b/gdb/frame.h
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--- a/gdb/frame.h
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+++ b/gdb/frame.h
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@@ -186,8 +186,14 @@ class scoped_restore_selected_frame
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private:
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- /* The ID of the previously selected frame. */
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+ /* The ID and level of the previously selected frame. */
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struct frame_id m_fid;
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+ int m_level;
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+
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+ /* Save/restore the language as well, because selecting a frame
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+ changes the current language to the frame's language if "set
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+ language auto". */
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+ enum language m_lang;
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};
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/* Methods for constructing and comparing Frame IDs. */
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@@ -316,24 +322,49 @@ extern bool has_stack_frames ();
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modifies the target invalidating the frame cache). */
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extern void reinit_frame_cache (void);
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-/* On demand, create the selected frame and then return it. If the
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- selected frame can not be created, this function prints then throws
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- an error. When MESSAGE is non-NULL, use it for the error message,
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+/* Return the selected frame. Always returns non-NULL. If there
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+ isn't an inferior sufficient for creating a frame, an error is
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+ thrown. When MESSAGE is non-NULL, use it for the error message,
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otherwise use a generic error message. */
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/* FIXME: cagney/2002-11-28: At present, when there is no selected
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frame, this function always returns the current (inner most) frame.
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It should instead, when a thread has previously had its frame
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selected (but not resumed) and the frame cache invalidated, find
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and then return that thread's previously selected frame. */
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-extern struct frame_info *get_selected_frame (const char *message);
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-
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-/* If there is a selected frame, return it. Otherwise, return NULL. */
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-extern struct frame_info *get_selected_frame_if_set (void);
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+extern struct frame_info *get_selected_frame (const char *message = nullptr);
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-/* Select a specific frame. NULL, apparently implies re-select the
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- inner most frame. */
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+/* Select a specific frame. NULL implies re-select the inner most
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+ frame. */
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extern void select_frame (struct frame_info *);
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+/* Save the frame ID and frame level of the selected frame in FRAME_ID
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+ and FRAME_LEVEL, to be restored later with restore_selected_frame.
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+
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+ This is preferred over getting the same info out of
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+ get_selected_frame directly because this function does not create
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+ the selected-frame's frame_info object if it hasn't been created
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+ yet, and thus is more efficient and doesn't throw. */
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+extern void save_selected_frame (frame_id *frame_id, int *frame_level)
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+ noexcept;
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+
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+/* Restore selected frame as saved with save_selected_frame.
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+
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+ Does not try to find the corresponding frame_info object. Instead
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+ the next call to get_selected_frame will look it up and cache the
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+ result.
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+
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+ This function does not throw. It is designed to be safe to called
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+ from the destructors of RAII types. */
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+extern void restore_selected_frame (frame_id frame_id, int frame_level)
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+ noexcept;
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+
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+/* Lookup the frame_info object for the selected frame FRAME_ID /
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+ FRAME_LEVEL and cache the result.
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+
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+ If FRAME_LEVEL > 0 and the originally selected frame isn't found,
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+ warn and select the innermost (current) frame. */
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+extern void lookup_selected_frame (frame_id frame_id, int frame_level);
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+
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/* Given a FRAME, return the next (more inner, younger) or previous
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(more outer, older) frame. */
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extern struct frame_info *get_prev_frame (struct frame_info *);
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diff --git a/gdb/gdbthread.h b/gdb/gdbthread.h
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--- a/gdb/gdbthread.h
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+++ b/gdb/gdbthread.h
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@@ -673,6 +673,10 @@ class scoped_restore_current_thread
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frame_id m_selected_frame_id;
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int m_selected_frame_level;
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bool m_was_stopped;
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+ /* Save/restore the language as well, because selecting a frame
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+ changes the current language to the frame's language if "set
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+ language auto". */
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+ enum language m_lang;
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};
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/* Returns a pointer into the thread_info corresponding to
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diff --git a/gdb/infrun.c b/gdb/infrun.c
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--- a/gdb/infrun.c
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+++ b/gdb/infrun.c
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@@ -9006,8 +9006,10 @@ struct infcall_control_state
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enum stop_stack_kind stop_stack_dummy = STOP_NONE;
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int stopped_by_random_signal = 0;
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- /* ID if the selected frame when the inferior function call was made. */
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+ /* ID and level of the selected frame when the inferior function
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+ call was made. */
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struct frame_id selected_frame_id {};
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+ int selected_frame_level = -1;
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};
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/* Save all of the information associated with the inferior<==>gdb
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@@ -9036,27 +9038,12 @@ save_infcall_control_state ()
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inf_status->stop_stack_dummy = stop_stack_dummy;
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inf_status->stopped_by_random_signal = stopped_by_random_signal;
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- inf_status->selected_frame_id = get_frame_id (get_selected_frame (NULL));
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+ save_selected_frame (&inf_status->selected_frame_id,
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+ &inf_status->selected_frame_level);
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return inf_status;
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}
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-static void
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-restore_selected_frame (const frame_id &fid)
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-{
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- frame_info *frame = frame_find_by_id (fid);
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-
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- /* If inf_status->selected_frame_id is NULL, there was no previously
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- selected frame. */
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- if (frame == NULL)
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- {
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- warning (_("Unable to restore previously selected frame."));
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- return;
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- }
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-
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- select_frame (frame);
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-}
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-
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/* Restore inferior session state to INF_STATUS. */
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void
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@@ -9084,21 +9071,8 @@ restore_infcall_control_state (struct infcall_control_state *inf_status)
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if (target_has_stack)
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{
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- /* The point of the try/catch is that if the stack is clobbered,
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- walking the stack might encounter a garbage pointer and
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- error() trying to dereference it. */
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- try
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- {
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- restore_selected_frame (inf_status->selected_frame_id);
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- }
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- catch (const gdb_exception_error &ex)
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- {
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- exception_fprintf (gdb_stderr, ex,
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- "Unable to restore previously selected frame:\n");
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- /* Error in restoring the selected frame. Select the
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- innermost frame. */
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- select_frame (get_current_frame ());
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- }
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+ restore_selected_frame (inf_status->selected_frame_id,
|
|
+ inf_status->selected_frame_level);
|
|
}
|
|
|
|
delete inf_status;
|
|
diff --git a/gdb/stack.c b/gdb/stack.c
|
|
--- a/gdb/stack.c
|
|
+++ b/gdb/stack.c
|
|
@@ -1842,9 +1842,9 @@ trailing_outermost_frame (int count)
|
|
static void
|
|
select_frame_command_core (struct frame_info *fi, bool ignored)
|
|
{
|
|
- struct frame_info *prev_frame = get_selected_frame_if_set ();
|
|
+ frame_info *prev_frame = get_selected_frame ();
|
|
select_frame (fi);
|
|
- if (get_selected_frame_if_set () != prev_frame)
|
|
+ if (get_selected_frame () != prev_frame)
|
|
gdb::observers::user_selected_context_changed.notify (USER_SELECTED_FRAME);
|
|
}
|
|
|
|
@@ -1863,10 +1863,9 @@ select_frame_for_mi (struct frame_info *fi)
|
|
static void
|
|
frame_command_core (struct frame_info *fi, bool ignored)
|
|
{
|
|
- struct frame_info *prev_frame = get_selected_frame_if_set ();
|
|
-
|
|
+ frame_info *prev_frame = get_selected_frame ();
|
|
select_frame (fi);
|
|
- if (get_selected_frame_if_set () != prev_frame)
|
|
+ if (get_selected_frame () != prev_frame)
|
|
gdb::observers::user_selected_context_changed.notify (USER_SELECTED_FRAME);
|
|
else
|
|
print_selected_thread_frame (current_uiout, USER_SELECTED_FRAME);
|
|
diff --git a/gdb/thread.c b/gdb/thread.c
|
|
--- a/gdb/thread.c
|
|
+++ b/gdb/thread.c
|
|
@@ -1325,20 +1325,26 @@ switch_to_thread (process_stratum_target *proc_target, ptid_t ptid)
|
|
switch_to_thread (thr);
|
|
}
|
|
|
|
-static void
|
|
-restore_selected_frame (struct frame_id a_frame_id, int frame_level)
|
|
+/* See frame.h. */
|
|
+
|
|
+void
|
|
+lookup_selected_frame (struct frame_id a_frame_id, int frame_level)
|
|
{
|
|
struct frame_info *frame = NULL;
|
|
int count;
|
|
|
|
- /* This means there was no selected frame. */
|
|
+ /* This either means there was no selected frame, or the selected
|
|
+ frame was the current frame. In either case, select the current
|
|
+ frame. */
|
|
if (frame_level == -1)
|
|
{
|
|
- select_frame (NULL);
|
|
+ select_frame (get_current_frame ());
|
|
return;
|
|
}
|
|
|
|
- gdb_assert (frame_level >= 0);
|
|
+ /* select_frame never saves 0 in SELECTED_FRAME_LEVEL, so we
|
|
+ shouldn't see it here. */
|
|
+ gdb_assert (frame_level > 0);
|
|
|
|
/* Restore by level first, check if the frame id is the same as
|
|
expected. If that fails, try restoring by frame id. If that
|
|
@@ -1409,64 +1415,28 @@ scoped_restore_current_thread::restore ()
|
|
&& target_has_stack
|
|
&& target_has_memory)
|
|
restore_selected_frame (m_selected_frame_id, m_selected_frame_level);
|
|
+
|
|
+ set_language (m_lang);
|
|
}
|
|
|
|
scoped_restore_current_thread::~scoped_restore_current_thread ()
|
|
{
|
|
if (!m_dont_restore)
|
|
- {
|
|
- try
|
|
- {
|
|
- restore ();
|
|
- }
|
|
- catch (const gdb_exception &ex)
|
|
- {
|
|
- /* We're in a dtor, there's really nothing else we can do
|
|
- but swallow the exception. */
|
|
- }
|
|
- }
|
|
+ restore ();
|
|
}
|
|
|
|
scoped_restore_current_thread::scoped_restore_current_thread ()
|
|
{
|
|
m_inf = inferior_ref::new_reference (current_inferior ());
|
|
|
|
+ m_lang = current_language->la_language;
|
|
+
|
|
if (inferior_ptid != null_ptid)
|
|
{
|
|
m_thread = thread_info_ref::new_reference (inferior_thread ());
|
|
|
|
- struct frame_info *frame;
|
|
-
|
|
m_was_stopped = m_thread->state == THREAD_STOPPED;
|
|
- if (m_was_stopped
|
|
- && target_has_registers
|
|
- && target_has_stack
|
|
- && target_has_memory)
|
|
- {
|
|
- /* When processing internal events, there might not be a
|
|
- selected frame. If we naively call get_selected_frame
|
|
- here, then we can end up reading debuginfo for the
|
|
- current frame, but we don't generally need the debuginfo
|
|
- at this point. */
|
|
- frame = get_selected_frame_if_set ();
|
|
- }
|
|
- else
|
|
- frame = NULL;
|
|
-
|
|
- try
|
|
- {
|
|
- m_selected_frame_id = get_frame_id (frame);
|
|
- m_selected_frame_level = frame_relative_level (frame);
|
|
- }
|
|
- catch (const gdb_exception_error &ex)
|
|
- {
|
|
- m_selected_frame_id = null_frame_id;
|
|
- m_selected_frame_level = -1;
|
|
-
|
|
- /* Better let this propagate. */
|
|
- if (ex.error == TARGET_CLOSE_ERROR)
|
|
- throw;
|
|
- }
|
|
+ save_selected_frame (&m_selected_frame_id, &m_selected_frame_level);
|
|
}
|
|
}
|
|
|