gdb/testsuite/gdb.base/return.exp

   1 # Copyright (C) 1992, 1997 Free Software Foundation, Inc.
   2
   3 # This program is free software; you can redistribute it and/or modify
   4 # it under the terms of the GNU General Public License as published by
   5 # the Free Software Foundation; either version 2 of the License, or
   6 # (at your option) any later version.
   7 #
   8 # This program is distributed in the hope that it will be useful,
   9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 # GNU General Public License for more details.
  12 #
  13 # You should have received a copy of the GNU General Public License
  14 # along with this program; if not, write to the Free Software
  15 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  16
  17 # Please email any bugs, comments, and/or additions to this file to:
  18 # bug-gdb@prep.ai.mit.edu
  19
  20 # This file was written by Jeff Law. (law@cs.utah.edu)
  21
  22 if $tracelevel then {
  23         strace $tracelevel
  24 }
  25
  26 set prms_id 0
  27 set bug_id 0
  28
  29 set testfile "return"
  30 set srcfile ${testfile}.c
  31 set binfile ${objdir}/${subdir}/${testfile}
  32 if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
  33      gdb_suppress_entire_file "Testcase compile failed, so all tests in this file will automatically fail."
  34 }
  35
  36 proc return_tests { } {
  37     global gdb_prompt
  38
  39
  40     if { ! [ runto func1 ] } then { return 0 }
  41     send_gdb "return\n"
  42     gdb_expect {
  43         -re "Make .* return now.*y or n. $" {
  44             send_gdb "y\n"
  45             exp_continue
  46         }
  47         -re "func1 ..;.*$gdb_prompt $" {
  48             send_gdb "step\n"
  49             exp_continue
  50         }
  51     -re ".*in main after func1.*$gdb_prompt $" { pass "simple return" }
  52     -re "$gdb_prompt $" { fail "simple return" }
  53     timeout { fail "(timeout) simple return" }
  54     }
  55
  56     # Set breakpoints in other interesting functions.
  57     gdb_test "break func2" "" "break func2"
  58     gdb_test "break func3" "" "break func3"
  59
  60     gdb_test "continue" "return -5;" "continue to return of -5"
  61     send_gdb "return 5\n"
  62     gdb_expect {
  63         -re "Make .* return now.*y or n. $" {
  64             send_gdb "y\n"
  65             exp_continue
  66         }
  67     -re ".*tmp2 = func2.*$gdb_prompt $" { }
  68     -re "$gdb_prompt $" { fail "did not return (integer test)" }
  69     timeout { fail "(timeout) did not return (integer test)" }
  70     }
  71     gdb_test "next" "tmp3 = func3.*" "next over call to func2"
  72
  73     gdb_test "p tmp2" ".* = 5" "correct value returned (integer test)"
  74
  75     gdb_test "continue" "return -5.0;" "continue to return of -5.0"
  76     send_gdb "return 5.0\n"
  77     gdb_expect {
  78         -re "Make .* return now.*y or n. $" {
  79             send_gdb "y\n"
  80             exp_continue
  81         }
  82         -re ".*tmp3 = func3.*$gdb_prompt $" { }
  83         -re "$gdb_prompt $" { fail "did not return (double test)" }
  84         timeout { fail "(timeout) did not return (double test)" }
  85     }
  86
  87     gdb_test "next" "printf.*" "next over call to func3"
  88
  89     # This test is going to fail on all i*86 systems using an i*87.
  90     # When returning a floating point value from a function, all known
  91     # compilers do this via a `fldl' instruction, which pushes the floating
  92     # value on the i387 stack. This causes two problems:
  93     # a) Most i*86 targets do not store (or cannot store, see comment in
  94     #    in i386v-nat.c:i386_register_u_addr) the floating point registers
  95     #    to the target.
  96     # b) gdb would have to figure out if the `fldl' instruction (or variants
  97     #    of it) has already been executed. If not, it would have to simulate
  98     #    a push instruction, as it is not enough to write the register,
  99     #    the floating point `stack pointer' has to be updated too.
 100     #    Do not expect this to get fixed anytime soon.
 101
 102     # This test also fails for sparc Solaris 2.3 & 2.4, but passes under 2.5
 103     # At the time the `next' is issued, the floating point unit for the
 104     # process is not yet initialized, and the storing of the floating
 105     # point value to the floating point return register is ignored.
 106     # Xfail it for current versions that are known to fail.  Presumably
 107     # if some future version does initialize the floating point unit at
 108     # process start, making this test pass, it will be for a version that
 109     # is not xfailed.
 110
 111     setup_xfail "i*86-*-*" "sparc-*-solaris2.3*" "sparc-*-solaris2.4*"
 112     gdb_test "p tmp3" ".* = 5.*" "correct value returned double test (known problem with i*86 and sparc solaris"
 113 }
 114
 115
 116 # Start with a fresh gdb.
 117
 118 gdb_exit
 119 gdb_start
 120 gdb_reinitialize_dir $srcdir/$subdir
 121 gdb_load ${binfile}
 122
 123 set timeout 30
 124 return_tests