--- /dev/null
+/* The following is written to tickle a specific bug in the macro
+ table code (now hopefully fixed), which doesn't insert new included
+ files in the #including file's list in the proper place. They
+ should be sorted by the number of the line which #included them, in
+ increasing order, but the sense of the comparison was reversed, so
+ the list ends up being built backwards. This isn't a problem by
+ itself, but the code to pick new, non-conflicting line numbers for
+ headers alleged to be #included at the same line as some other
+ header assumes that the list's line numbers are in ascending order.
+
+ So, given the following input, lineinc1.h gets added to lineinc.c's
+ #inclusion list first, at line 10. When the debug info reader
+ tries to add lineinc2.h at line 10 as well, the code will notice the
+ duplication --- since there's only one extant element in the list,
+ it'll find it --- and insert it after lineinc1.h, with line 11.
+ Since the code is putting the list in order of descending
+ #inclusion line number, the list is now out of order. When we try
+ to #include lineinc3.h at line 11, we won't notice the duplication. */
+
+#line 10
+#include "lineinc1.h"
+#line 10
+#include "lineinc2.h"
+#line 11
+#include "lineinc3.h"
+
+int
+main (int argc, char **argv)
+{
+}
--- /dev/null
+# Test macro handling of #included files.
+# Copyright 2003 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 2 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, write to the Free Software
+# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+# Please email any bugs, comments, and/or additions to this file to:
+# bug-gdb@prep.ai.mit.edu
+
+# The test program lineinc.c contains a mix of #line directives and
+# #include directives that will cause the compiler to attribute more
+# than one #inclusion to the same source line. You can get similar
+# effects using things like GCC's '-imacros' flag.
+#
+# Compiling lineinc.c with Dwarf 2 macro information will produce
+# something like this:
+#
+# $ gcc -g3 lineinc.c -o lineinc
+# $ readelf -wml lineinc
+# ...
+# The File Name Table:
+# Entry Dir Time Size Name
+# 1 0 0 0 lineinc.c
+# 2 0 0 0 lineinc1.h
+# 3 0 0 0 lineinc2.h
+# 4 0 0 0 lineinc3.h
+# ...
+# Contents of the .debug_macinfo section:
+#
+# DW_MACINFO_start_file - lineno: 0 filenum: 1
+# DW_MACINFO_define - lineno : 1 macro : __VERSION__ "3.2 20020903 (Red Hat Linux 8.0 3.2-7)"
+# DW_MACINFO_define - lineno : 2 macro : __USER_LABEL_PREFIX__
+# ...
+# DW_MACINFO_define - lineno : 1 macro : __i386__ 1
+# DW_MACINFO_define - lineno : 1 macro : __tune_i386__ 1
+# DW_MACINFO_start_file - lineno: 10 filenum: 2
+# DW_MACINFO_define - lineno : 1 macro : FOO 1
+# DW_MACINFO_end_file
+# DW_MACINFO_start_file - lineno: 10 filenum: 3
+# DW_MACINFO_undef - lineno : 1 macro : FOO
+# DW_MACINFO_define - lineno : 2 macro : FOO 2
+# DW_MACINFO_end_file
+# DW_MACINFO_start_file - lineno: 11 filenum: 4
+# DW_MACINFO_undef - lineno : 1 macro : FOO
+# DW_MACINFO_define - lineno : 2 macro : FOO 3
+# DW_MACINFO_end_file
+# DW_MACINFO_end_file
+# $
+#
+# Note how the inclusions of lineinc1.h and lineinc2.h are both
+# attributed to line 10 of lineinc.c, and the #inclusion of lineinc3.h
+# is attributed to line 11. This is all correct, given the #line
+# directives in lineinc.c.
+#
+# Dwarf 2 macro information doesn't contain enough information to
+# allow GDB to figure out what's really going on here --- it makes no
+# mention of the #line directives --- so we just try to cope as best
+# we can. If the macro table were to attribute more than one
+# #inclusion to the same source line, then GDB wouldn't be able to
+# tell which #included file's #definitions and #undefinitions come
+# first, so it can't tell which #definitions are in scope following
+# all the #inclusions. To cope with this, GDB puts all the files
+# #included by a given source file in a list sorted by the line at
+# which they were #included; this gives GDB the chance to detect
+# multiple #inclusions at the same line, complain, and assign
+# distinct, albiet incorrect, line numbers to each #inclusion.
+#
+# However, at one point GDB was sorting the list in reverse order,
+# while the code to assign new, distinct line numbers assumed it was
+# sorted in ascending order; GDB would get an internal error trying to
+# read the above debugging info.
+
+if $tracelevel then {
+ strace $tracelevel
+}
+
+set prms_id 0
+set bug_id 0
+
+set testfile "lineinc"
+set binfile ${objdir}/${subdir}/${testfile}
+
+
+if {[gdb_compile "${srcdir}/${subdir}/${testfile}.c" ${binfile} executable {debug}] != ""} {
+ gdb_suppress_entire_file "Testcase compile failed, so all tests in this file will automatically fail."
+}
+
+gdb_exit
+gdb_start
+gdb_reinitialize_dir $srcdir/$subdir
+gdb_load ${binfile}
+
+# Any command that causes GDB to read the debugging info for the
+# lineinc.c compilation unit will do here.
+set test_name "tolerate macro info with multiple #inclusions per line"
+gdb_test_multiple "break main" $test_name {
+ -re "Breakpoint 1 at 0x.*: file .*lineinc.c.*\\.\r\n${gdb_prompt}" {
+ pass $test_name
+ }
+ -re ".*internal-error:.*.y or n. " {
+ fail $test_name
+ send_gdb "y\n"
+ gdb_expect {
+ -re ".*.y or n. " {
+ send_gdb "n\n"
+ exp_continue
+ }
+ -re "$gdb_prompt" {
+ }
+ timeout {
+ fail "$test_name (timeout)"
+ }
+ }
+ }
+}
projects / binutils-gdb.git / commitdiff