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http://sourceware.org/ml/gdb-patches/2010-09/msg00440.html
Subject: [patch] Fix infinite loop crash on self-referencing class
Hi,
class C { static C s; }; is a problem for GDB as it references itself and it
can crash. Downstream Bug:
https://bugzilla.redhat.com/show_bug.cgi?id=627432
#3 0x00000000005b2cc5 in gnuv3_pass_by_reference (type=0x1044d3c8) at ../../gdb/gnu-v3-abi.c:840
#4 0x00000000005b2cc5 in gnuv3_pass_by_reference (type=0x1044d3c8) at ../../gdb/gnu-v3-abi.c:840
[...]
No regressions on {x86_64,x86_64-m32,i686}-fedora13-linux-gnu.
FYI the .cc file is not reproducible on - and only on - Fedora 14 GCC, filed:
https://bugzilla.redhat.com/show_bug.cgi?id=637315
I would even check it in in some time.
Thanks,
Jan
gdb/
2010-09-24 Jan Kratochvil <jan.kratochvil@redhat.com>
Fix GDB crash on inferior calls with self-referencing classes.
* gnu-v3-abi.c (gnuv3_pass_by_reference): Do not call itself on static
member fields.
gdb/testsuite/
2010-09-24 Jan Kratochvil <jan.kratochvil@redhat.com>
Fix GDB crash on inferior calls with self-referencing classes.
* gdb.dwarf2/dw2-cp-infcall-ref-static.exp: New file.
* gdb.dwarf2/dw2-cp-infcall-ref-static-main.c: New file.
* gdb.dwarf2/dw2-cp-infcall-ref-static.S: New file.
--- a/gdb/gnu-v3-abi.c
+++ b/gdb/gnu-v3-abi.c
@@ -835,9 +835,10 @@ gnuv3_pass_by_reference (struct type *type)
by reference, so does this class. Similarly for members, which
are constructed whenever this class is. We do not need to worry
about recursive loops here, since we are only looking at members
- of complete class type. */
+ of complete class type. Also ignore any static members. */
for (fieldnum = 0; fieldnum < TYPE_NFIELDS (type); fieldnum++)
- if (gnuv3_pass_by_reference (TYPE_FIELD_TYPE (type, fieldnum)))
+ if (TYPE_FIELD_LOC_KIND (type, fieldnum) == FIELD_LOC_KIND_BITPOS
+ && gnuv3_pass_by_reference (TYPE_FIELD_TYPE (type, fieldnum)))
return 1;
return 0;
--- /dev/null
+++ b/gdb/testsuite/gdb.dwarf2/dw2-cp-infcall-ref-static-main.c
@@ -0,0 +1,51 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+ Copyright 2010 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/>. */
+
+/* class C
+ {
+ public:
+ static C s;
+ };
+ C C::s;
+ C f()
+ {
+ return C::s;
+ } */
+
+asm (".globl cu_text_start");
+asm ("cu_text_start:");
+
+asm (".globl f_start");
+asm ("f_start:");
+
+void
+f (void)
+{
+}
+
+asm (".globl f_end");
+asm ("f_end:");
+
+int
+main (void)
+{
+ f ();
+ return 0;
+}
+
+asm (".globl cu_text_end");
+asm ("cu_text_end:");
--- /dev/null
+++ b/gdb/testsuite/gdb.dwarf2/dw2-cp-infcall-ref-static.S
@@ -0,0 +1,115 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+ Copyright 2010 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/>. */
+
+/* Debug information */
+
+ .section .debug_info
+.Lcu1_begin:
+ /* CU header */
+ .4byte .Lcu1_end - .Lcu1_start /* Length of Compilation Unit */
+.Lcu1_start:
+ .2byte 2 /* DWARF Version */
+ .4byte .Labbrev1_begin /* Offset into abbrev section */
+ .byte 4 /* Pointer size */
+
+ /* CU die */
+ .uleb128 1 /* Abbrev: DW_TAG_compile_unit */
+ .4byte cu_text_start /* DW_AT_low_pc */
+ .4byte cu_text_end /* DW_AT_high_pc */
+ .ascii "file1.txt\0" /* DW_AT_name */
+ .ascii "GNU C 3.3.3\0" /* DW_AT_producer */
+ .byte 4 /* DW_AT_language (DW_LANG_C_plus_plus) */
+
+.Ltype_class:
+ .uleb128 3 /* Abbrev: DW_TAG_class_type */
+ .ascii "C\0" /* DW_AT_name */
+
+ .uleb128 4 /* Abbrev: DW_TAG_member */
+ .ascii "s\0" /* DW_AT_name */
+ .4byte .Ltype_class-.Lcu1_begin /* DW_AT_type */
+ .byte 1 /* DW_AT_declaration */
+ .byte 1 /* DW_AT_external */
+
+ .byte 0 /* End of children of DW_TAG_class_type */
+
+ .uleb128 5 /* Abbrev: DW_TAG_subprogram */
+ .ascii "f\0" /* DW_AT_name */
+ .4byte .Ltype_class-.Lcu1_begin /* DW_AT_type */
+ .4byte f_start /* DW_AT_low_pc */
+ .4byte f_end /* DW_AT_high_pc */
+
+ .byte 0 /* End of children of CU */
+
+.Lcu1_end:
+
+/* Abbrev table */
+ .section .debug_abbrev
+.Labbrev1_begin:
+ .uleb128 1 /* Abbrev code */
+ .uleb128 0x11 /* DW_TAG_compile_unit */
+ .byte 1 /* has_children */
+ .uleb128 0x11 /* DW_AT_low_pc */
+ .uleb128 0x1 /* DW_FORM_addr */
+ .uleb128 0x12 /* DW_AT_high_pc */
+ .uleb128 0x1 /* DW_FORM_addr */
+ .uleb128 0x3 /* DW_AT_name */
+ .uleb128 0x8 /* DW_FORM_string */
+ .uleb128 0x25 /* DW_AT_producer */
+ .uleb128 0x8 /* DW_FORM_string */
+ .uleb128 0x13 /* DW_AT_language */
+ .uleb128 0xb /* DW_FORM_data1 */
+ .byte 0x0 /* Terminator */
+ .byte 0x0 /* Terminator */
+
+ .uleb128 3 /* Abbrev code */
+ .uleb128 0x2 /* DW_TAG_class_type */
+ .byte 1 /* has_children */
+ .uleb128 0x3 /* DW_AT_name */
+ .uleb128 0x8 /* DW_FORM_string */
+ .byte 0x0 /* Terminator */
+ .byte 0x0 /* Terminator */
+
+ .uleb128 4 /* Abbrev code */
+ .uleb128 0xd /* DW_TAG_member */
+ .byte 0 /* has_children */
+ .uleb128 0x3 /* DW_AT_name */
+ .uleb128 0x8 /* DW_FORM_string */
+ .uleb128 0x49 /* DW_AT_type */
+ .uleb128 0x13 /* DW_FORM_ref4 */
+ .uleb128 0x3c /* DW_AT_declaration */
+ .uleb128 0xc /* DW_FORM_flag */
+ .uleb128 0x3f /* DW_AT_external */
+ .uleb128 0xc /* DW_FORM_flag */
+ .byte 0x0 /* Terminator */
+ .byte 0x0 /* Terminator */
+
+ .uleb128 5 /* Abbrev code */
+ .uleb128 0x2e /* DW_TAG_subprogram */
+ .byte 0 /* has_children */
+ .uleb128 0x3 /* DW_AT_name */
+ .uleb128 0x8 /* DW_FORM_string */
+ .uleb128 0x49 /* DW_AT_type */
+ .uleb128 0x13 /* DW_FORM_ref4 */
+ .uleb128 0x11 /* DW_AT_low_pc */
+ .uleb128 0x1 /* DW_FORM_addr */
+ .uleb128 0x12 /* DW_AT_high_pc */
+ .uleb128 0x1 /* DW_FORM_addr */
+ .byte 0x0 /* Terminator */
+ .byte 0x0 /* Terminator */
+
+ .byte 0x0 /* Terminator */
+ .byte 0x0 /* Terminator */
--- /dev/null
+++ b/gdb/testsuite/gdb.dwarf2/dw2-cp-infcall-ref-static.exp
@@ -0,0 +1,49 @@
+# Copyright 2010 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 can call C++ functions whose parameters or return values have
+# type containing a static member of the same type.
+
+# Still no C++ compiler is used.
+if { [skip_cplus_tests] } { continue }
+
+# This test can only be run on targets which support DWARF-2 and use gas.
+# For now pick a sampling of likely targets.
+if {![istarget *-*-linux*]
+ && ![istarget *-*-gnu*]
+ && ![istarget *-*-elf*]
+ && ![istarget *-*-openbsd*]
+ && ![istarget arm-*-eabi*]
+ && ![istarget powerpc-*-eabi*]} {
+ return 0
+}
+
+set testfile "dw2-cp-infcall-ref-static"
+if { [prepare_for_testing ${testfile}.exp ${testfile} [list ${testfile}-main.c ${testfile}.S] {}] } {
+ return -1
+}
+
+if ![runto_main] then {
+ return -1
+}
+
+# main is not provided by DWARF.
+gdb_test_no_output "set language c++"
+
+# There are no mangled names in DWARF to suggest the v3 ABI.
+gdb_test_no_output "set cp-abi gnu-v3"
+
+# GDB could crash. There is no DW_AT_location so it is <optimized out>.
+gdb_test "p f()" { = {static s = <optimized out>}}
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