gdb/testsuite/gdb.base/pointers.exp

# Copyright (C) 1998 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

# This file was written by Elena Zannoni (ezannoni@cygnus.com)

# This file is part of the gdb testsuite
#
# tests for pointer arithmetic and pointer dereferencing
# with integer type variables and pointers to integers
# 

if $tracelevel then {
	strace $tracelevel
	}

#
# test running programs
#
set prms_id 0
set bug_id 0

set testfile "pointers"
set srcfile ${testfile}.c
set binfile ${objdir}/${subdir}/${testfile}

if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug additional_flags=-w}] != "" } {
     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}


#
# set it up at a breakpoint so we can play with the variable values
#

if ![runto_main] then {
    perror "couldn't run to breakpoint"
    continue
}

gdb_test "next" "return 0;" "continuing after dummy()"


#
# let's see if gdb catches some illegal operations on pointers
#
# I must comment these out because strict type checking is not
# supported in this version of GDB. I do not really know
# what the expected gdb reply is.
#

#send_gdb "print v_int_pointer2 = &v_int_pointer\n"
#gdb_expect {
#    -re ".*.*$gdb_prompt $" {
#        pass "illegal pointer assignment rejected"
#      }
#    -re ".*$gdb_prompt $" { fail "illegal pointer assignment rejected" }
#    timeout           { fail "(timeout) illegal pointer assignment rejected" }    
#  }


#send_gdb "print v_unsigned_int_pointer = &v_int\n"
#gdb_expect {
#    -re ".*.*$gdb_prompt $" {
#        pass "illegal pointer assignment rejected"
#      }
#    -re ".*$gdb_prompt $" { fail "illegal pointer assignment rejected" }
#    timeout           { fail "(timeout) ilegal pointer assignment rejected" }    
#  }

#send_gdb "print v_unsigned_int_pointer == v_double_pointer\n"
#gdb_expect {
#    -re ".*.*$gdb_prompt $" {
#        pass "illegal pointer operation (+) rejected"
#      }
#    -re ".*$gdb_prompt $" { fail "illegal pointer operation (+) rejected" }
#    timeout           { fail "(timeout) illegal pointer operation (+) rejected" }    
#  }


#send_gdb "print v_unsigned_int_pointer * v_double_pointer\n"
#gdb_expect {
#    -re ".*Argument to arithmetic operation not a number or boolean.*$gdb_prompt $" {
#        pass "illegal pointer operation (*) rejected"
#      }
#    -re ".*$gdb_prompt $" { fail "illegal pointer operation (*) rejected" }
#    timeout           { fail "(timeout) illegal pointer operation (*) rejected" }    
#  }


#send_gdb "print v_unsigned_int_pointer = v_double_pointer\n"
#gdb_expect {
#    -re ".*.*$gdb_prompt $" {
#        pass "ilegal pointer assignment rejected"
#      }
#    -re ".*$gdb_prompt $" { fail "illegal pointer assignment rejected" }
#    timeout           { fail "(timeout) illegal pointer assignment rejected" }    
#  }


#send_gdb "print v_unsigned_int_pointer = v_unsigned_int\n"
#gdb_expect {
#    -re ".*.*$gdb_prompt $" {
#        pass "illegal pointer assignment rejected"
#      }
#    -re ".*$gdb_prompt $" { fail "illegal pointer assignment rejected" }
#    timeout           { fail "(timeout) illegal pointer assignment rejected" }    
#  }

gdb_test "set variable v_int_pointer=&v_int_array\[0\]" "" "set pointer to beginning of array"
gdb_test "set variable v_int_pointer2=&v_int_array\[1\]" "" "set pointer to end of array"


send_gdb "print *v_int_pointer\n"
gdb_expect {
    -re ".*= 6.*$gdb_prompt $" {
        pass "print object pointed to"
      }
    -re ".*$gdb_prompt $" { fail "print object pointed to" }
    timeout           { fail "(timeout) print object pointed to" }    
  }
  
send_gdb "print *v_int_pointer2\n"
gdb_expect {
    -re ".*= 18.*$gdb_prompt $" {
        pass "print object pointed to"
      }
    -re ".*$gdb_prompt $" { fail "print object pointed to" }
    timeout           { fail "(timeout) print object pointed to" }    
  }


send_gdb "print v_int_pointer == v_int_pointer2\n"
gdb_expect {
    -re ".*= 0.*$gdb_prompt $" {
        pass "pointer1==pointer2"
      }
    -re ".*$gdb_prompt $" { fail "pointer1==pointer2" }
    timeout           { fail "(timeout) pointer1==pointer2" }    
  }

send_gdb "print v_int_pointer != v_int_pointer2\n"
gdb_expect {
    -re ".*= 1.*$gdb_prompt $" {
        pass "pointer1!=pointer2"
      }
    -re ".*$gdb_prompt $" { fail "pointer1!=pointer2" }
    timeout           { fail "(timeout) pointer1!=pointer2" }    
  }


send_gdb "print v_int_pointer <= v_int_pointer2\n"
gdb_expect {
    -re ".*= 1.*$gdb_prompt $" {
        pass "pointer1<=pointer2"
      }
    -re ".*$gdb_prompt $" { fail "pointer1<=pointer2" }
    timeout           { fail "(timeout) pointer1<=pointer2" }    
  }


send_gdb "print v_int_pointer >= v_int_pointer2\n"
gdb_expect {
    -re ".*= 0.*$gdb_prompt $" {
        pass "pointer1>=pointer2"
      }
    -re ".*$gdb_prompt $" { fail "pointer1>=pointer2" }
    timeout           { fail "(timeout) pointer1>=pointer2" }    
  }


send_gdb "print v_int_pointer < v_int_pointer2\n"
gdb_expect {
    -re ".*= 1.*$gdb_prompt $" {
        pass "pointer1<pointer2"
      }
    -re ".*$gdb_prompt $" { fail "pointer1<pointer2" }
    timeout           { fail "(timeout) pointer1<pointer2" }    
  }

send_gdb "print v_int_pointer > v_int_pointer2\n"
gdb_expect {
    -re ".*= 0.*$gdb_prompt $" {
        pass "pointer1>pointer2"
      }
    -re ".*$gdb_prompt $" { fail "pointer1>pointer2" }
    timeout           { fail "(timeout) pointer1>pointer2" }    
  }


gdb_test "set variable y = *v_int_pointer++" "" "set y = *v_int_pointer++"
send_gdb "print y\n"
gdb_expect {
    -re ".*= 6.*$gdb_prompt $" {
        send_gdb "print *v_int_pointer\n"
        gdb_expect {
             -re ".*= 18.*$gdb_prompt $" {
                 pass "pointer assignment and increment"
               }
             -re ".*$gdb_prompt $" { fail "pointer assignment and increment" }
             timeout           { fail "(timeout) pointer assignment and increment" }    
         }
         }
    -re ".*$gdb_prompt $" { fail "pointer assignment and increment" }
    timeout           { fail "(timeout) pointer assignment and increment" }    
  }




gdb_test "set variable y = *--v_int_pointer2" "" "set y = *--v_int_pointer2"
send_gdb "print y\n"
gdb_expect {
    -re ".*= 6.*$gdb_prompt $" {
        send_gdb "print *v_int_pointer2\n"
        gdb_expect {
             -re ".*= 6.*$gdb_prompt $" {
                 pass "pointer decrement and assignment"
               }
             -re ".*$gdb_prompt $" { fail "pointer decrement and assignment" }
             timeout           { fail "(timeout) pointer decrement and assignment" }    
         }
         }
    -re ".*$gdb_prompt $" { fail "pointer decrement and assignment" }
    timeout           { fail "(timeout) pointer decrement and assignment" }    
  }

gdb_test "set variable y =v_int_pointer-v_int_pointer2" "" "set y =v_int_pointer-v_int_pointer2"
send_gdb "print y\n"
gdb_expect {
    -re ".*= 1.*$gdb_prompt $" {
        pass "pointer1-pointer2"
      }
    -re ".*$gdb_prompt $" { fail "pointer1-pointer2" }
    timeout           { fail "(timeout) pointer1-pointer2" }    
  }

gdb_test "set variable v_int_pointer=v_int_array" "" "set v_int_pointer=v_int_array"
send_gdb "print *v_int_pointer\n"
gdb_expect {
    -re ".*= 6.*$gdb_prompt $" {
        pass "print array element through pointer"
      }
    -re ".*$gdb_prompt $" { fail "print array element through pointer" }
    timeout           { fail "(timeout) print array element through pointer" }    
  }


send_gdb "print *(v_int_pointer+1)\n"
gdb_expect {
    -re ".*= 18.*$gdb_prompt $" {
        pass "print array element through pointer"
      }
    -re ".*$gdb_prompt $" { fail "print array element through pointer" }
    timeout           { fail "(timeout) print array element through pointer" }    
  }

# test print elements of array through pointers

send_gdb "print (*rptr)\[0\]\n"
gdb_expect {
    -re ".*= 0.*$gdb_prompt $" {
        pass "print array element through pointer"
      }
    -re ".*$gdb_prompt $" { fail "print array element through pointer" }
    timeout           { fail "(timeout) print array element through pointer" }    
  }

send_gdb "print (*rptr)\[1\]\n"
gdb_expect {
    -re ".*= 1.*$gdb_prompt $" {
        pass "print array element through pointer"
      }
    -re ".*$gdb_prompt $" { fail "print array element through pointer" }
    timeout           { fail "(timeout) print array element through pointer" }    
  }


send_gdb "print (*rptr)\[2\]\n"
gdb_expect {
    -re ".*= 2.*$gdb_prompt $" {
        pass "print array element through pointer"
      }
    -re ".*$gdb_prompt $" { fail "print array element through pointer" }
    timeout           { fail "(timeout) print array element through pointer" }    
  }

gdb_test "set variable rptr = rptr+1" "" "increment rptr"

send_gdb "print (*rptr)\[0\]\n"
gdb_expect {
    -re ".*= 3.*$gdb_prompt $" {
        pass "print array element through pointer"
      }
    -re ".*$gdb_prompt $" { fail "print array element through pointer" }
    timeout           { fail "(timeout) print array element through pointer" }    
  }


send_gdb "print (*rptr)\[1\]\n"
gdb_expect {
    -re ".*= 4.*$gdb_prompt $" {
        pass "print array element through pointer"
      }
    -re ".*$gdb_prompt $" { fail "print array element through pointer" }
    timeout           { fail "(timeout) print array element through pointer" }    
  }


send_gdb "print (*rptr)\[2\]\n"
gdb_expect {
    -re ".*= 5.*$gdb_prompt $" {
        pass "print array element through pointer"
      }
    -re ".*$gdb_prompt $" { fail "print array element through pointer" }
    timeout           { fail "(timeout) print array element through pointer" }    
  }


send_gdb "print *( *(matrix+1) +2)\n"
gdb_expect {
    -re ".*= 5.*$gdb_prompt $" {
        pass "print array element w/ pointer arithmetic"
      }
    -re ".*$gdb_prompt $" { fail "print array element w/ pointer arithemtic" }
    timeout           { fail "(timeout) print array element w/ pointer arithmetic" }    
  }


send_gdb "print **ptr_to_ptr_to_float\n"
gdb_expect {
    -re ".*= 100.*$gdb_prompt $" {
        pass "print through ptr to ptr"
      }
    -re ".*$gdb_prompt $" { fail "print through ptr to ptr" }
    timeout           { fail "(timeout) print through ptr to ptr" }    
  }