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- Maintenance script qa.sh:

Browse Source 
* Update PR28561 kfail.
  * Update PR29781 kfail.
- Maintenance script qa-local.sh:
  * Add "Verify quilt setup" step.
- Patches added (backport from master):
  * gdb-symtab-handle-self-reference-die.patch
  * gdb-symtab-handle-self-reference-in-inherit_abstract.patch
  * gdb-symtab-add-optimized-out-static-var-to-cooked-in.patch

OBS-URL: https://build.opensuse.org/package/show/devel:gcc/gdb?expand=0&rev=368
This commit is contained in:
Tom de Vries 2023-10-31 08:26:56 +00:00 committed by Git OBS Bridge
parent 6827fe2016
commit 8961c2b3e4
7 changed files with 584 additions and 7 deletions
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299
gdb-symtab-add-optimized-out-static-var-to-cooked-in.patch Normal file
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@ -0,0 +1,299 @@
From 7f4601b0a51f400bd1b1bc0f7895254d467e3bb4 Mon Sep 17 00:00:00 2001
From: Tom de Vries <tdevries@suse.de>
Date: Fri, 21 Jul 2023 08:25:25 +0200
Subject: [PATCH] [gdb/symtab] Add optimized out static var to cooked index
Consider the test-case:
...
$ cat main.c
int main (void) { return 0; }
$ cat static-optimized-out.c
static int aaa;
...
compiled like this:
...
$ gcc-12 static-optimized-out.c main.c -g -O2 -flto
...
There's a difference in behaviour depending on symtab expansion state:
...
$ gdb -q -batch a.out -ex "print aaa"
No symbol "aaa" in current context.
$ gdb -q -batch a.out -ex "maint expand-symtab" -ex "print aaa"
$1 = <optimized out>
...
The reason for the difference is that the optimized out variable aaa:
...
<1><104>: Abbrev Number: 2 (DW_TAG_variable)
<105> DW_AT_name : aaa
<109> DW_AT_decl_file : 1
<10a> DW_AT_decl_line : 18
<10b> DW_AT_decl_column : 12
<10c> DW_AT_type : <0x110>
...
is not added to the cooked index because of this clause in abbrev_table::read:
...
else if (!has_location && !has_specification_or_origin && !has_external
&& cur_abbrev->tag == DW_TAG_variable)
cur_abbrev->interesting = false;
...
Fix this inconsistency by making sure that the optimized out variable is added
to the cooked index.
Regression tested on x86_64-linux.
Add two test-cases, a C test-case gdb.opt/static-optimized-out.exp and a dwarf
assembly test-case gdb.dwarf2/static-optimized-out.exp.
Tested gdb.opt/static-optimized-out.exp with gcc-8 to gcc-12, for which we now
consistently get:
...
(gdb) print aaa^M
$1 = <optimized out>^M
...
and with gcc 7.5.0 and clang 13.0.1, for which we still consistently get:
...
(gdb) print aaa^M
No symbol "aaa" in current context.^M
...
due to missing debug info for the variable.
PR symtab/30656
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30656
Approved-By: Tom Tromey <tom@tromey.com>
---
gdb/dwarf2/abbrev.c | 9 ---
.../gdb.dwarf2/static-optimized-out.exp | 69 +++++++++++++++++++
gdb/testsuite/gdb.opt/main.c | 22 ++++++
gdb/testsuite/gdb.opt/static-optimized-out.c | 18 +++++
.../gdb.opt/static-optimized-out.exp | 49 +++++++++++++
5 files changed, 158 insertions(+), 9 deletions(-)
create mode 100644 gdb/testsuite/gdb.dwarf2/static-optimized-out.exp
create mode 100644 gdb/testsuite/gdb.opt/main.c
create mode 100644 gdb/testsuite/gdb.opt/static-optimized-out.c
create mode 100644 gdb/testsuite/gdb.opt/static-optimized-out.exp
diff --git a/gdb/dwarf2/abbrev.c b/gdb/dwarf2/abbrev.c
index 1ebf8f6eed5..3a429fd41b1 100644
--- a/gdb/dwarf2/abbrev.c
+++ b/gdb/dwarf2/abbrev.c
@@ -162,7 +162,6 @@ abbrev_table::read (struct dwarf2_section_info *section,
bool has_specification_or_origin = false;
bool has_name = false;
bool has_linkage_name = false;
- bool has_location = false;
bool has_external = false;
/* Now read in declarations. */
@@ -217,11 +216,6 @@ abbrev_table::read (struct dwarf2_section_info *section,
has_linkage_name = true;
break;
- case DW_AT_const_value:
- case DW_AT_location:
- has_location = true;
- break;
-
case DW_AT_sibling:
if (is_csize && cur_attr.form == DW_FORM_ref4)
sibling_offset = size;
@@ -296,9 +290,6 @@ abbrev_table::read (struct dwarf2_section_info *section,
cur_abbrev->interesting = false;
else if (!tag_interesting_for_index (cur_abbrev->tag))
cur_abbrev->interesting = false;
- else if (!has_location && !has_specification_or_origin && !has_external
- && cur_abbrev->tag == DW_TAG_variable)
- cur_abbrev->interesting = false;
else
cur_abbrev->interesting = true;
diff --git a/gdb/testsuite/gdb.dwarf2/static-optimized-out.exp b/gdb/testsuite/gdb.dwarf2/static-optimized-out.exp
new file mode 100644
index 00000000000..1547a8acbc0
--- /dev/null
+++ b/gdb/testsuite/gdb.dwarf2/static-optimized-out.exp
@@ -0,0 +1,69 @@
+# Copyright 2023 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+# Check that an optimized out static variable is printed the same independent
+# of state of symtab expansion. See also gdb.opt/static-optimized-out.exp.
+
+load_lib dwarf.exp
+
+# This test can only be run on targets which support DWARF-2 and use gas.
+if { ![dwarf2_support] } {
+ return 0
+}
+
+standard_testfile main.c -dw.S
+
+# Make DWARF for the test.
+set asm_file [standard_output_file $srcfile2]
+Dwarf::assemble $asm_file {
+ cu {} {
+ compile_unit {
+ {
+ language @DW_LANG_C
+ }
+ } {
+ declare_labels integer_label
+
+ integer_label: DW_TAG_base_type {
+ {DW_AT_byte_size 4 DW_FORM_sdata}
+ {DW_AT_encoding @DW_ATE_signed}
+ {DW_AT_name integer}
+ }
+
+ DW_TAG_variable {
+ {name var}
+ {type :$integer_label}
+ }
+ }
+ }
+}
+
+if { [prepare_for_testing "failed to prepare" ${testfile} \
+ [list $srcfile $asm_file] {nodebug}] } {
+ return -1
+}
+
+gdb_test "print var" " = <optimized out>"
+
+# Expand all symbol tables.
+gdb_test_no_output "maint expand-symtabs"
+
+# Make sure we do an actual lookup rather than just returning the same as
+# before.
+gdb_test_no_output "maint flush symbol-cache"
+
+with_test_prefix "after expand-symtabs" {
+ gdb_test "print var" " = <optimized out>"
+}
diff --git a/gdb/testsuite/gdb.opt/main.c b/gdb/testsuite/gdb.opt/main.c
new file mode 100644
index 00000000000..c6beff77dbe
--- /dev/null
+++ b/gdb/testsuite/gdb.opt/main.c
@@ -0,0 +1,22 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+ Copyright 2023 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+int
+main (void)
+{
+ return 0;
+}
diff --git a/gdb/testsuite/gdb.opt/static-optimized-out.c b/gdb/testsuite/gdb.opt/static-optimized-out.c
new file mode 100644
index 00000000000..44287fbd6d2
--- /dev/null
+++ b/gdb/testsuite/gdb.opt/static-optimized-out.c
@@ -0,0 +1,18 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+ Copyright 2023 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+static int aaa;
diff --git a/gdb/testsuite/gdb.opt/static-optimized-out.exp b/gdb/testsuite/gdb.opt/static-optimized-out.exp
new file mode 100644
index 00000000000..bd673b6503e
--- /dev/null
+++ b/gdb/testsuite/gdb.opt/static-optimized-out.exp
@@ -0,0 +1,49 @@
+# Copyright 2023 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+# Check that an optimized out static variable is printed the same independent
+# of state of symtab expansion. See also gdb.dwarf2/static-optimized-out.exp.
+
+standard_testfile .c main.c
+
+set opts {}
+lappend opts debug
+lappend opts "optimize=-O2 -flto"
+
+if { [prepare_for_testing "failed to prepare" $testfile \
+ [list $srcfile $srcfile2] $opts] } {
+ return -1
+}
+
+set val ""
+gdb_test_multiple "print aaa" "" {
+ -re -wrap "\r\n(?:\\$$decimal = )?(\[^\r\n\]*)" {
+ set val $expect_out(1,string)
+ }
+}
+
+if { $val == "" } {
+ return
+}
+
+# Expand all symbol tables.
+gdb_test_no_output "maint expand-symtab"
+
+# Make sure we do an actual lookup rather than just returning the same as
+# before.
+gdb_test_no_output "maint flush symbol-cache"
+
+# Now check that we get the same result in both cases.
+gdb_test "print aaa" [string_to_regexp $val] "consistency"
base-commit: 800c393f89a94f49b01dff99f693cb13c5e28116
--
2.35.3

159
gdb-symtab-handle-self-reference-die.patch Normal file
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@ -0,0 +1,159 @@
From 8f53ac47d3f9c3800c8429d9187961ba81707d8b Mon Sep 17 00:00:00 2001
From: Tom de Vries <tdevries@suse.de>
Date: Wed, 16 Aug 2023 23:43:25 +0200
Subject: [PATCH 1/2] [gdb/symtab] Handle self-reference DIE
While working on a dwarf assembly test-case I accidentally created the
following pathological dwarf:
...
<1><be>: Abbrev Number: 3 (DW_TAG_class_type)
<bf> DW_AT_name : c1
<c2> DW_AT_specification: <0xbe>
...
and noticed gdb segfaulting during cooked index creating due to running out of
stack. This is a regression from gdb-12, where gdb just hung.
Fix this by inhibiting the scan_attributes self-recursion for self-references.
The same test-case with -readnow makes gdb hang, so also fix this in
dwarf2_attr and follow_die_ref.
Note that this doesn't fix the same problems for the more complicated case of:
...
<1><be>: Abbrev Number: 3 (DW_TAG_class_type)
<bf> DW_AT_name : c1
<c2> DW_AT_specification: <0xc6>
<1><c6>: Abbrev Number: 4 (DW_TAG_class_type)
<c7> DW_AT_name : c2
<ca> DW_AT_specification: <0xbe>
...
but the approach for deciding whether to fix pathological dwarf cases is as
per PR27981 comment 3:
...
yes if it is cheap/obvious, and no if it is something complicated or expensive.
...
and at this point I'm not sure whether fixing this will fall in the first
category.
Tested on x86_64-linux.
Approved-By: Tom Tromey <tom@tromey.com>
---
gdb/dwarf2/read.c | 22 +++++++++--
gdb/testsuite/gdb.dwarf2/self-spec.exp | 54 ++++++++++++++++++++++++++
2 files changed, 73 insertions(+), 3 deletions(-)
create mode 100644 gdb/testsuite/gdb.dwarf2/self-spec.exp
diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c
index 61f4bd75013..1be5f381432 100644
--- a/gdb/dwarf2/read.c
+++ b/gdb/dwarf2/read.c
@@ -18289,9 +18289,15 @@ cooked_indexer::scan_attributes (dwarf2_per_cu_data *scanning_per_cu,
new_info_ptr,
&bytes_read);
new_info_ptr += bytes_read;
- scan_attributes (scanning_per_cu, new_reader, new_info_ptr, new_info_ptr,
- new_abbrev, name, linkage_name, flags, nullptr,
- parent_entry, maybe_defer, true);
+
+ if (new_reader->cu == reader->cu && new_info_ptr == watermark_ptr)
+ {
+ /* Self-reference, we're done. */
+ }
+ else
+ scan_attributes (scanning_per_cu, new_reader, new_info_ptr,
+ new_info_ptr, new_abbrev, name, linkage_name,
+ flags, nullptr, parent_entry, maybe_defer, true);
}
}
@@ -19783,7 +19789,11 @@ dwarf2_attr (struct die_info *die, unsigned int name, struct dwarf2_cu *cu)
if (!spec)
break;
+ struct die_info *prev_die = die;
die = follow_die_ref (die, spec, &cu);
+ if (die == prev_die)
+ /* Self-reference, we're done. */
+ break;
}
return NULL;
@@ -22521,6 +22531,12 @@ follow_die_ref (struct die_info *src_die, const struct attribute *attr,
struct dwarf2_cu *cu = *ref_cu;
struct die_info *die;
+ if (attr->form != DW_FORM_GNU_ref_alt && src_die->sect_off == sect_off)
+ {
+ /* Self-reference, we're done. */
+ return src_die;
+ }
+
die = follow_die_offset (sect_off,
(attr->form == DW_FORM_GNU_ref_alt
|| cu->per_cu->is_dwz),
diff --git a/gdb/testsuite/gdb.dwarf2/self-spec.exp b/gdb/testsuite/gdb.dwarf2/self-spec.exp
new file mode 100644
index 00000000000..77e92549fd1
--- /dev/null
+++ b/gdb/testsuite/gdb.dwarf2/self-spec.exp
@@ -0,0 +1,54 @@
+# Copyright 2023 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+# Check that gdb doesn't hang or segfault on reading a DIE with a
+# specification reference to itself.
+
+load_lib dwarf.exp
+
+if {![dwarf2_support]} {
+ return 0
+}
+
+standard_testfile main.c .S
+
+# Create the DWARF.
+set asm_file [standard_output_file $srcfile2]
+Dwarf::assemble $asm_file {
+ cu {} {
+ compile_unit {{language @DW_LANG_C_plus_plus}} {
+ declare_labels c1
+ c1: class_type {
+ {name c1}
+ {specification :$c1}
+ }
+ }
+ }
+}
+
+if [prepare_for_testing "failed to prepare" $testfile "${asm_file} ${srcfile}" {}] {
+ return -1
+}
+
+set index [have_index $binfile]
+if { ![string eq $index ""] } {
+ return 0
+}
+
+if { [readnow] } {
+ return 0
+}
+
+gdb_test "maint expand-symtabs"
base-commit: 6c9e159dbd1a35aafa134fcd52982174236a8dd9
--
2.35.3

92
gdb-symtab-handle-self-reference-in-inherit_abstract.patch Normal file
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@ -0,0 +1,92 @@
From 800c393f89a94f49b01dff99f693cb13c5e28116 Mon Sep 17 00:00:00 2001
From: Tom de Vries <tdevries@suse.de>
Date: Mon, 28 Aug 2023 16:27:58 +0200
Subject: [PATCH 2/2] [gdb/symtab] Handle self-reference in
inherit_abstract_dies
Building gdb with gcc 7.5.0 and -flto -O2 -flto-partition=one generates a
self-referencing DIE:
...
<2><91dace>: Abbrev Number: 405 (DW_TAG_label)
<91dad0> DW_AT_abstract_origin: <0x91dace>
...
When encountering the self-reference DIE in inherit_abstract_dies we loop
following the abstract origin, effectively hanging gdb.
Fix this by handling self-referencing DIEs in the loop in
inherit_abstract_dies.
Tested on x86_64-linux.
Approved-By: Tom Tromey <tom@tromey.com>
PR symtab/30799
https://sourceware.org/bugzilla/show_bug.cgi?id=30799
---
gdb/dwarf2/read.c | 7 +++++++
gdb/testsuite/gdb.dwarf2/self-spec.exp | 16 +++++++++++++++-
2 files changed, 22 insertions(+), 1 deletion(-)
diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c
index 1be5f381432..970dd54c7a5 100644
--- a/gdb/dwarf2/read.c
+++ b/gdb/dwarf2/read.c
@@ -11938,8 +11938,15 @@ inherit_abstract_dies (struct die_info *die, struct dwarf2_cu *cu)
if (attr == nullptr)
break;
+ die_info *prev_child_origin_die = child_origin_die;
child_origin_die = follow_die_ref (child_origin_die, attr,
&child_origin_cu);
+
+ if (prev_child_origin_die == child_origin_die)
+ {
+ /* Handle DIE with self-reference. */
+ break;
+ }
}
/* If missing DW_AT_abstract_origin, try the corresponding child
diff --git a/gdb/testsuite/gdb.dwarf2/self-spec.exp b/gdb/testsuite/gdb.dwarf2/self-spec.exp
index 77e92549fd1..f04ff6da42e 100644
--- a/gdb/testsuite/gdb.dwarf2/self-spec.exp
+++ b/gdb/testsuite/gdb.dwarf2/self-spec.exp
@@ -14,7 +14,7 @@
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# Check that gdb doesn't hang or segfault on reading a DIE with a
-# specification reference to itself.
+# specification/abstract_origin reference to itself.
load_lib dwarf.exp
@@ -29,11 +29,25 @@ set asm_file [standard_output_file $srcfile2]
Dwarf::assemble $asm_file {
cu {} {
compile_unit {{language @DW_LANG_C_plus_plus}} {
+ # Check handling of self-referencing DIE.
declare_labels c1
c1: class_type {
{name c1}
{specification :$c1}
}
+
+ # Check handling of self-referencing child DIE. Regression test
+ # for PR30799.
+ declare_labels f1 abstract_f1 f1_l
+ abstract_f1: subprogram {}
+ f1: subprogram {
+ {MACRO_AT_func {main}}
+ {abstract_origin :$abstract_f1}
+ } {
+ f1_l: label {
+ {abstract_origin :$f1_l}
+ }
+ }
}
}
}
--
2.35.3

13
gdb.changes
View File

@ -1,3 +1,16 @@
-------------------------------------------------------------------
Sun Oct 29 18:57:21 UTC 2023 - Tom de Vries <tdevries@suse.com>
- Maintenance script qa.sh:
* Update PR28561 kfail.
* Update PR29781 kfail.
- Maintenance script qa-local.sh:
* Add "Verify quilt setup" step.
- Patches added (backport from master):
* gdb-symtab-handle-self-reference-die.patch
* gdb-symtab-handle-self-reference-in-inherit_abstract.patch
* gdb-symtab-add-optimized-out-static-var-to-cooked-in.patch
-------------------------------------------------------------------
Thu Oct 26 12:51:55 UTC 2023 - Tom de Vries <tdevries@suse.com>

6
gdb.spec
View File

@ -334,6 +334,9 @@ Patch2040: gdb-symtab-don-t-deduplicate-variables-in-gdb-index.patch
Patch2041: xcoffread.c-fix-werror-dangling-pointer-issue-with-m.patch
Patch2042: avoid-manual-memory-management-in-go-lang.c.patch
Patch2043: gdb-go-handle-v3-go_0-mangled-prefix.patch
Patch2044: gdb-symtab-handle-self-reference-die.patch
Patch2045: gdb-symtab-handle-self-reference-in-inherit_abstract.patch
Patch2046: gdb-symtab-add-optimized-out-static-var-to-cooked-in.patch
# Backports from master, not yet available in next release.
@ -773,6 +776,9 @@ find -name "*.info*"|xargs rm -f
%patch2041 -p1
%patch2042 -p1
%patch2043 -p1
%patch2044 -p1
%patch2045 -p1
%patch2046 -p1
%patch2070 -p1

18
qa-local.sh
View File

@ -28,9 +28,10 @@ usage ()
echo "usage: $0 <1-4>"
echo "1: Cleanup"
echo "2: List configs"
echo "3: Do local builds without testsuite"
echo "4: Do local builds with testsuite"
echo "5: Verify local testsuite results"
echo "3: Verify quilt setup"
echo "4: Do local builds without testsuite"
echo "5: Do local builds with testsuite"
echo "6: Verify local testsuite results"
}
if [ $# -eq 0 ]; then
@ -120,8 +121,13 @@ case "$n" in
done
done
;;
3)
quilt setup -d $root -v gdb.spec
rm -Rf $root/gdb-*
;;
4)
acquire_sudo_rights
rm -Rf $logs/$n
@ -155,7 +161,7 @@ case "$n" in
done
;;
4)
5)
acquire_sudo_rights
rm -Rf $logs/$n
@ -214,7 +220,7 @@ case "$n" in
done
;;
5)
6)
for arch in $archs; do
for c in $configs; do
if ! have_combo $arch $c; then

4
qa.sh
View File

@ -282,7 +282,7 @@ kfail=(
"FAIL: gdb.gdb/selftest.exp: backtrace through signal handler"
# https://sourceware.org/bugzilla/show_bug.cgi?id=29781
"FAIL: gdb.mi/mi-multi-commands.exp: args=: look for second command output, command length .* \(timeout\)"
"FAIL: gdb.mi/mi-multi-commands.exp: args=.*: look for second command output, command length .* \(timeout\)"
# https://sourceware.org/bugzilla/show_bug.cgi?id=27027
# https://sourceware.org/bugzilla/show_bug.cgi?id=28464
@ -530,6 +530,8 @@ kfail_aarch64=(
"FAIL: gdb.mi/.*.exp:"
"FAIL: gdb.python/.*-mi.exp:"
"FAIL: gdb.python/py-mi-.*.exp:"
"FAIL: gdb.ada/mi.*.exp:"
"FAIL: gdb.base/annota.*.exp:"
) # kfail_aarch64