#   Copyright 1997-2021 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/>.

# This is a test of gdb's ability to follow a process through a
# Unix exec() system call.

# Until "catch exec" is implemented on other targets...
#
if { ![istarget "*-linux*"] } then {
    continue
}

standard_testfile foll-exec.c

set testfile2 "execd-prog"
set srcfile2 ${testfile2}.c
set binfile2 [standard_output_file ${testfile2}]

set compile_options debug

# build the first test case
if  { [gdb_compile "${srcdir}/${subdir}/${srcfile2}" "${binfile2}" executable $compile_options] != "" } {
     untested "failed to compile"
     return -1
}

if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable $compile_options] != "" } {
     untested "failed to compile"
     return -1
}

proc do_exec_tests {} {
   global binfile srcfile srcfile2 testfile testfile2
   global gdb_prompt

   # Start the program running, and stop at main.
   #
   if ![runto_main] then {
     fail "couldn't run ${testfile}"
     return
   }

   # Verify that the system supports "catch exec".
   gdb_test "catch exec" "Catchpoint \[0-9\]* \\(exec\\)" "insert first exec catchpoint"
   set has_exec_catchpoints 0
   gdb_test_multiple "continue" "continue to first exec catchpoint" {
     -re ".*Your system does not support this type\r\nof catchpoint.*$gdb_prompt $" {
       unsupported "continue to first exec catchpoint"
     }
     -re ".*Catchpoint.*$gdb_prompt $" {
       set has_exec_catchpoints 1
       pass "continue to first exec catchpoint"
     }
   }

   if {$has_exec_catchpoints == 0} {
     unsupported "exec catchpoints"
     return
   }

   clean_restart $binfile

   # Start the program running, and stop at main.
   #
   if ![runto_main] then {
     fail "couldn't run ${testfile}"
     return
   }

   with_test_prefix "1st run" {
       # Execute the code setting up variable PROG.
       set tbreak_line [gdb_get_line_number " tbreak-execlp " $srcfile]
       gdb_test "tbreak ${tbreak_line}" "" "insert breakpoint"
       gdb_continue_to_breakpoint "line tbreak-execlp" ".*execlp \\(.*"
   }

   # Verify that we can see various global and local variables
   # in this program, and that they have expected values.  Some
   # of these variables are also declared in the program we'll
   # exec in a moment.
   #

   send_gdb "print global_i\n"
   gdb_expect {
     -re ".* = 100.*$gdb_prompt $"\
                     {pass "print follow-exec/global_i"}
     -re "$gdb_prompt $" {fail "print follow-exec/global_i"}
     timeout         {fail "(timeout) print follow-exec/global_i"}
   }
   send_gdb "print local_j\n"
   gdb_expect {
     -re ".* = 101.*$gdb_prompt $"\
                     {pass "print follow-exec/local_j"}
     -re "$gdb_prompt $" {fail "print follow-exec/local_j"}
     timeout         {fail "(timeout) print follow-exec/local_j"}
   }
   send_gdb "print local_k\n"
   gdb_expect {
     -re ".* = 102.*$gdb_prompt $"\
                     {pass "print follow-exec/local_k"}
     -re "$gdb_prompt $" {fail "print follow-exec/local_k"}
     timeout         {fail "(timeout) print follow-exec/local_k"}
   }

   # Try stepping through an execlp call, without catching it.
   # We should stop in execd-program, at its first statement.
   #
   set execd_line [gdb_get_line_number "after-exec" $srcfile2]
   send_gdb "next\n"
   gdb_expect {
     -re ".*xecuting new program: .*${testfile2}.*${srcfile2}:${execd_line}.*int  local_j = argc;.*$gdb_prompt $"\
                     {pass "step through execlp call"}
     -re "$gdb_prompt $" {fail "step through execlp call"}
     timeout         {fail "(timeout) step through execlp call"}
   }

   # Verify that we can see the variables defined in the newly-exec'd
   # program, and CANNOT see those defined in the exec'ing program.
   #
   send_gdb "next\n"
   gdb_expect {
     -re "printf \\(.Hello .*$gdb_prompt $"\
                     {pass "step after execlp call"}
     -re "$gdb_prompt $" {fail "step after execlp call"}
     timeout         {fail "(timeout) step after execlp call"}
   }
   send_gdb "print global_i\n"
   gdb_expect {
     -re ".* = 0.*$gdb_prompt $"\
                     {pass "print execd-program/global_i (after execlp)"}
     -re "$gdb_prompt $" {fail "print execd-program/global_i (after execlp)"}
     timeout         {fail "(timeout) print execd-program/global_i (after execlp)"}
   }
   send_gdb "print local_j\n"
   gdb_expect {
     -re ".* = 2.*$gdb_prompt $"\
                     {pass "print execd-program/local_j (after execlp)"}
     -re "$gdb_prompt $" {fail "print execd-program/local_j (after execlp)"}
     timeout         {fail "(timeout) print execd-program/local_j (after execlp)"}
   }
   send_gdb "print local_k\n"
   gdb_expect {
     -re "No symbol \"local_k\" in current context.*$gdb_prompt $"\
                     {pass "print follow-exec/local_k (after execlp)"}
     -re "$gdb_prompt $" {fail "print follow-exec/local_k (after execlp)"}
     timeout         {fail "(timeout) print follow-exec/local_k (after execlp)"}
   }

   # Explicitly kill this program, or a subsequent rerun actually runs
   # the exec'd program, not the original program...
   clean_restart $binfile

   # Start the program running, and stop at main.
   #
   if ![runto_main] then {
     fail "couldn't run ${testfile} (2nd try)"
     return
   }

   # Verify that we can catch an exec event, and then continue
   # to follow through the exec.  (Since there's a breakpoint on
   # "main", it'll also be transferred to the exec'd program,
   # and we expect to stop there.)
   #
   send_gdb "catch exec\n"
   gdb_expect {
     -re "Catchpoint .*(exec).*$gdb_prompt $"\
                     {pass "set catch exec"}
     -re "$gdb_prompt $" {fail "set catch exec"}
     timeout         {fail "(timeout) set catch exec"}
   }

   # Verify that the catchpoint is mentioned in an "info breakpoints",
   # and further that the catchpoint mentions no program name.
   #
   set msg "info shows catchpoint without exec pathname"
   gdb_test_multiple "info breakpoints" $msg {
       -re ".*catchpoint.*keep y.*exec\[\n\r\]+$gdb_prompt $" {
           pass $msg
       }
   }

   send_gdb "continue\n"
   gdb_expect {
     -re ".*xecuting new program:.*${testfile2}.*Catchpoint .*(exec\'d .*${testfile2}).*$gdb_prompt $"\
                     {pass "hit catch exec"}
     -re "$gdb_prompt $" {fail "hit catch exec"}
     timeout         {fail "(timeout) hit catch exec"}
   }

   # DTS CLLbs16760
   # test gets out of sync if previous test fails.
   gdb_test "bt" ".*" "sync up after possible failure 1"
   gdb_test "bt" "#0.*" "sync up after possible failure 2"

   # Verify that the catchpoint is mentioned in an "info breakpoints",
   # and further that the catchpoint managed to capture the exec'd
   # program's name.
   #
   set msg "info shows catchpoint exec pathname"
   gdb_test_multiple "info breakpoints" $msg {
       -re ".*catchpoint.*keep y.*exec, program \".*${testfile2}\".*$gdb_prompt $" {
           pass $msg
       }
   }

   # Verify that we can continue from the catchpoint, and land in the
   # main of the newly-exec'd program.
   #
   send_gdb "continue\n"
   gdb_expect {
     -re ".*${srcfile2}:${execd_line}.*$gdb_prompt $"\
                     {pass "continue after hit catch exec"}
     -re "$gdb_prompt $" {fail "continue after hit catch exec"}
     timeout         {fail "(timeout) continue after hit catch exec"}
   }

   # Explicitly kill this program, or a subsequent rerun actually runs
   # the exec'd program, not the original program...
   clean_restart $binfile

   # Start the program running, and stop at main.
   #
   if ![runto_main] then {
     fail "couldn't run ${testfile} (3rd try)"
     return
   }

   with_test_prefix "2nd run" {
       # Execute the code setting up variable PROG.
       set tbreak_line [gdb_get_line_number " tbreak-execlp " $srcfile]
       gdb_test "tbreak ${tbreak_line}" "" "insert breakpoint"
       gdb_continue_to_breakpoint "line tbreak-execlp" ".*execlp \\(.*"
   }

   # Verify that we can follow through follow an execl()
   # call.  (We must jump around earlier exec* calls.)
   #
   set tbreak_line [gdb_get_line_number " tbreak-execl " $srcfile]
   send_gdb "tbreak ${tbreak_line}\n"
   gdb_expect {
     -re "Temporary breakpoint .*file .*${srcfile}, line ${tbreak_line}.*$gdb_prompt $"\
                     {pass "prepare to jump to execl call"}
     -re "$gdb_prompt $" {fail "prepare to jump to execl call"}
     timeout         {fail "(timeout) prepare to jump to execl call"}
   }
   send_gdb "jump ${tbreak_line}\n"
   gdb_expect {
     -re "main.* at .*${srcfile}:${tbreak_line}.*$gdb_prompt $"\
                     {pass "jump to execl call"}
     -re "$gdb_prompt $" {fail "jump to execl call"}
     timeout         {fail "(timeout) jump to execl call"}
   }
   # Note that stepping through an exec call causes the step-count
   # to be reset to zero.  I.e.: you may specify "next 2" at the
   # call, but you'll actually stop at the first breakpoint set in
   # the newly-exec'd program, not after the remaining step-count
   # reaches zero.
   #
   send_gdb "next 2\n"
   gdb_expect {
     -re ".*xecuting new program: .*${testfile2}.*${srcfile2}:${execd_line}.*int  local_j = argc;.*$gdb_prompt $"\
                     {pass "step through execl call"}
     -re "$gdb_prompt $" {fail "step through execl call"}
     timeout         {fail "(timeout) step through execl call"}
   }
   send_gdb "next\n"
   gdb_expect {
     -re "printf \\(.Hello .*$gdb_prompt $"\
                     {pass "step after execl call"}
     -re "$gdb_prompt $" {fail "step after execl call"}
     timeout         {fail "(timeout) step after execl call"}
   }

   # Verify that we can print a local variable (which happens to be
   # assigned the value of main's argc).
   #
   send_gdb "print local_j\n"
   gdb_expect {
     -re ".* = 3.*$gdb_prompt $"\
                     {pass "print execd-program/local_j (after execl)"}
     -re "$gdb_prompt $" {fail "print execd-program/local_j (after execl)"}
     timeout         {fail "(timeout) print execd-program/local_j (after execl)"}
   }

   # Explicitly kill this program, or a subsequent rerun actually runs
   # the exec'd program, not the original program...
   clean_restart $binfile

   # Start the program running, and stop at main.
   #
   if ![runto_main] then {
     fail "couldn't run ${testfile} (4th try)"
     return
   }

   with_test_prefix "3rd run" {
       # Execute the code setting up variable PROG.
       set tbreak_line [gdb_get_line_number " tbreak-execlp " $srcfile]
       gdb_test "tbreak ${tbreak_line}" "" "insert breakpoint"
       gdb_continue_to_breakpoint "line tbreak-execlp" ".*execlp \\(.*"
   }

   # Verify that we can follow through follow an execv()
   # call.  (We must jump around earlier exec* calls.)
   #
   set tbreak_line [gdb_get_line_number "tbreak-execv"]
   send_gdb "tbreak ${tbreak_line}\n"
   gdb_expect {
     -re "Temporary breakpoint .*file .*${srcfile}, line ${tbreak_line}.*$gdb_prompt $"\
                     {pass "prepare to jump to execv call"}
     -re "$gdb_prompt $" {fail "prepare to jump to execv call"}
     timeout         {fail "(timeout) prepare to jump to execv call"}
   }
   send_gdb "jump ${tbreak_line}\n"
   gdb_expect {
     -re "main.* at .*${srcfile}:${tbreak_line}.*$gdb_prompt $"\
                     {pass "jump to execv call"}
     -re "$gdb_prompt $" {fail "jump to execv call"}
     timeout         {fail "(timeout) jump to execv call"}
   }
   send_gdb "next\n"
   gdb_expect {
     -re ".*xecuting new program: .*${testfile2}.*${srcfile2}:${execd_line}.*int  local_j = argc;.*$gdb_prompt $"\
                     {pass "step through execv call"}
     -re "$gdb_prompt $" {fail "step through execv call"}
     timeout         {fail "(timeout) step through execv call"}
   }
   send_gdb "next\n"
   gdb_expect {
     -re "printf \\(.Hello .*$gdb_prompt $"\
                     {pass "step after execv call"}
     -re "$gdb_prompt $" {fail "step after execv call"}
     timeout         {fail "(timeout) step after execv call"}
   }

   # Verify that we can print a local variable (which happens to be
   # assigned the value of main's argc).
   #
   send_gdb "print local_j\n"
   gdb_expect {
     -re ".* = 2.*$gdb_prompt $"\
                     {pass "print execd-program/local_j (after execv)"}
     -re "$gdb_prompt $" {fail "print execd-program/local_j (after execv)"}
     timeout         {fail "(timeout) print execd-program/local_j (after execv)"}
   }

   # Explicitly kill this program, or a subsequent rerun actually runs
   # the exec'd program, not the original program...
   clean_restart $binfile

   # Start the program running, and stop at main.
   #
   if ![runto_main] then {
     fail "couldn't run ${testfile} (5th try)"
     return
   }

   # Verify that we can just continue and thereby follow through an
   # exec call.  (Since the breakpoint on "main" is reset, we should
   # just stop in main of the newly-exec'd program.)
   #
   send_gdb "continue\n"
   gdb_expect {
     -re ".*xecuting new program: .*${testfile2}.*${srcfile2}:${execd_line}.*int  local_j = argc;.*$gdb_prompt $"\
                     {pass "continue through exec"}
     -re "$gdb_prompt $" {fail "continue through exec"}
     timeout         {fail "(timeout) continue through exec"}
   }
}

# Start with a fresh gdb

gdb_exit
clean_restart $binfile

do_exec_tests

return 0