From: Hannes Domani <ssbssa@yahoo.de>
To: gdb-patches@sourceware.org
Subject: [PING] [PATCH] Fix backtrace limit stopping on inline frame
Date: Wed, 17 Jan 2024 17:05:36 +0100 [thread overview]
Message-ID: <09ebd05c-af75-bc36-a83d-981bf06a1975@yahoo.de> (raw)
In-Reply-To: <20240106141735.2330-1-ssbssa@yahoo.de>
Ping.
On 06.01.2024 15:17, Hannes Domani wrote:
> If you have set up a backtrace limit, and the backtrace stops
> because of this in an inline frame with arguments, you get an
> assertion failure:
> ```
> (gdb) bt
> #0 normal_frame (i=0) at gdb-29865.c:4
> #1 0x000000013fe3162a in inline_frame (i=0) at gdb-29865.c:9
> #2 main () at gdb-29865.c:14
> (gdb) set backtrace limit 2
> (gdb) bt
> #0 normal_frame (i=0) at gdb-29865.c:4
> #1 0x000000013fe3162a in inline_frame (
> C:/src/repos/binutils-gdb.git/gdb/frame.c:3346: internal-error: reinflate: Assertion `m_cached_level >= -1' failed.
> ```
>
> And if this one if fixed, there is another one as well:
> ```
> (gdb) bt
> #0 normal_frame (i=0) at gdb-29865.c:4
> #1 0x000000013fdf162a in inline_frame (
> C:/src/repos/binutils-gdb.git/gdb/dwarf2/loc.c:1160: internal-error: dwarf_expr_reg_to_entry_parameter: Assertion `frame != NULL' failed.
> ```
>
> The reason for both of them is this kind of loop:
> ```
> while (get_frame_type (frame) == INLINE_FRAME)
> frame = get_prev_frame (frame);
> ```
> Since get_prev_frame respects the backtrace limit, it will return
> NULL, and from there on you can't continue.
> This changes these loops to use get_prev_frame_always instead, so
> you always get a non-inline frame in the end.
>
> With this backtrace works:
> ```
> (gdb) bt
> #0 normal_frame (i=0) at gdb-29865.c:4
> #1 0x000000013fd4162a in inline_frame (i=0) at gdb-29865.c:9
> (gdb)
> ```
>
> Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29865
> ---
> gdb/dwarf2/frame.c | 2 +-
> gdb/dwarf2/loc.c | 2 +-
> gdb/testsuite/gdb.opt/inline-bt.c | 8 ++++----
> gdb/testsuite/gdb.opt/inline-bt.exp | 1 +
> 4 files changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/gdb/dwarf2/frame.c b/gdb/dwarf2/frame.c
> index d3d1ecdf1f5..143b934e5ef 100644
> --- a/gdb/dwarf2/frame.c
> +++ b/gdb/dwarf2/frame.c
> @@ -1423,7 +1423,7 @@ dwarf2_frame_cfa (frame_info_ptr this_frame)
> _("cfa not available for record btrace target"));
>
> while (get_frame_type (this_frame) == INLINE_FRAME)
> - this_frame = get_prev_frame (this_frame);
> + this_frame = get_prev_frame_always (this_frame);
> if (get_frame_unwind_stop_reason (this_frame) == UNWIND_UNAVAILABLE)
> throw_error (NOT_AVAILABLE_ERROR,
> _("can't compute CFA for this frame: "
> diff --git a/gdb/dwarf2/loc.c b/gdb/dwarf2/loc.c
> index c15221eb7a2..b1f188bf9c5 100644
> --- a/gdb/dwarf2/loc.c
> +++ b/gdb/dwarf2/loc.c
> @@ -1156,7 +1156,7 @@ dwarf_expr_reg_to_entry_parameter (frame_info_ptr frame,
>
> while (get_frame_type (frame) == INLINE_FRAME)
> {
> - frame = get_prev_frame (frame);
> + frame = get_prev_frame_always (frame);
> gdb_assert (frame != NULL);
> }
>
> diff --git a/gdb/testsuite/gdb.opt/inline-bt.c b/gdb/testsuite/gdb.opt/inline-bt.c
> index 8dac8d30300..0dad0f47e6e 100644
> --- a/gdb/testsuite/gdb.opt/inline-bt.c
> +++ b/gdb/testsuite/gdb.opt/inline-bt.c
> @@ -28,15 +28,15 @@ volatile int result;
>
> void bar(void);
>
> -inline ATTR int func1(void)
> +inline ATTR int func1(int s)
> {
> bar ();
> - return x * y;
> + return x * y + s;
> }
>
> inline ATTR int func2(void)
> {
> - return x * func1 ();
> + return x * func1 (1);
> }
>
> int main (void)
> @@ -47,7 +47,7 @@ int main (void)
> y = 8;
> bar ();
>
> - val = func1 ();
> + val = func1 (2);
> result = val;
>
> val = func2 ();
> diff --git a/gdb/testsuite/gdb.opt/inline-bt.exp b/gdb/testsuite/gdb.opt/inline-bt.exp
> index 501b24109e3..b0e5f61a5c7 100644
> --- a/gdb/testsuite/gdb.opt/inline-bt.exp
> +++ b/gdb/testsuite/gdb.opt/inline-bt.exp
> @@ -65,3 +65,4 @@ gdb_test "up" "#1 .*func1.*" "up from bar (4)"
> gdb_test "info frame" ".*in func1.*" "info frame still works"
> # Verify the user visible limit works as expected.
> gdb_test "up" "Initial frame selected; you cannot go up." "up hits limit"
> +gdb_test "backtrace" "#0 bar.*#1 .*func1.*" "backtrace hits limit"
next prev parent reply other threads:[~2024-01-17 16:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20240106141735.2330-1-ssbssa.ref@yahoo.de>
2024-01-06 14:17 ` Hannes Domani
2024-01-17 16:05 ` Hannes Domani [this message]
2024-01-26 17:05 ` [PING] " Hannes Domani
2024-01-29 10:55 ` Andrew Burgess
2024-01-29 14:35 ` Hannes Domani
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