2003-07-15 Michael Chastain <mec@shout.net>

	* gdb.base/gdb1250.exp: New file.
	* gdb.base/gdb1250.c: New file.

1 files changed, 80 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.base/gdb1250.exp b/gdb/testsuite/gdb.base/gdb1250.exp
new file mode 100644
index 0000000..60a6f59
--- /dev/null
+++ b/gdb/testsuite/gdb.base/gdb1250.exp
@@ -0,0 +1,80 @@
+# 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.  
+
+# Tests for PR gdb/1250.
+# 2003-07-15  Michael Chastain <mec@shout.net>
+
+# This file is part of the gdb testsuite.
+
+if $tracelevel then {
+        strace $tracelevel
+        }
+
+#
+# test running programs
+#
+set prms_id 0
+set bug_id 0
+
+set testfile "gdb1250"
+set srcfile ${testfile}.c
+set binfile ${objdir}/${subdir}/${testfile}
+
+if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${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 ${binfile}
+
+if ![runto abort] then {
+    perror "couldn't run to breakpoint"
+    continue
+}
+
+# See http://sources.redhat.com/gdb/bugs/1250
+#
+# In a nutshell: the function 'beta' ends with a call to 'abort', which
+# is a noreturn function.  So the last instruction of 'beta' is a call
+# to 'abort'.  When gdb looks for information about the caller of
+# 'beta', it looks at the instruction after the call to 'abort' -- which
+# is the first instruction of 'alpha'!  So gdb uses the wrong frame
+# information.  It thinks that the test program is in 'alpha' and that
+# the prologue "push %ebp / mov %esp,%ebp" has not been executed yet,
+# and grabs the wrong values.
+#
+# By the nature of the bug, it could pass if the C compiler is not smart
+# enough to implement 'abort' as a noreturn function.  This is okay.
+# The real point is that users often put breakpoints on noreturn
+# functions such as 'abort' or some kind of exitting function, and those
+# breakpoints should work.
+
+gdb_test_multiple "backtrace" "backtrace from abort" {
+    -re "#0.*abort.*\r\n#1.*beta.*\r\n#2.*alpha.*\r\n#3.*main.*\r\n$gdb_prompt $" {
+	pass "backtrace from abort"
+    }
+    -re "#0.*abort.*\r\n#1.*beta.*\r\n$gdb_prompt $" {
+	# This happens with gdb HEAD as of 2003-07-13, with gcc 3.3,
+	# binutils 2.14, either -gdwarf-2 or -gstabs+, on native
+	# i686-pc-linux-gnu.
+	#
+	# gdb gets 'abort' and 'beta' right and then goes into the
+	# weeds.
+	kfail "gdb/1250" "backtrace from abort"
+    }
+}