gdb/testsuite/gdb.cp/formatted-ref.exp

# Copyright 2007-2021 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/>.

# Author: P. N. Hilfinger, AdaCore, Inc.

# This test checks the behavior of formatted print when applied to a 
# reference value.  The intended behavior is that a formatted print of
# such a value should display the same value as a plain print, 
# modulo format, of course.  Older versions of GDB would instead print
# the reference's address value itself when doing a formatted print,
# rather than printing both that and the dereferenced value.  We also
# check that the (non-standard) expression &(&x), where x is of type T&,
# yields an appropriate value.
# This also tests that some other arithmetic operations on references
# work properly: condition expression using a reference object as one of its
# operand.


if { [skip_cplus_tests] } { continue }

standard_testfile .cc

if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug c++}]} {
    return -1
}

proc get_address { var } {
    global expect_out
    global gdb_prompt

    gdb_test_multiple "print &$var" "find address of $var" {
	-re "\\$\[0-9\]+ = \\(.*\\) (0x\[0-9a-f\]+).*$gdb_prompt $" {
            return $expect_out(1,string)
 	}
        timeout { 
	    perror "couldn't find address of $var"
	    return ""
        }
    }
    return ""
}

proc test_p_x { var type val addr } {
    global gdb_prompt

    set test "print/x $var"
    gdb_test_multiple $test $test {
        -re "\\$\[0-9\]+ = \\([string_to_regexp $type]\\) @0x\[a-f0-9\]+: [string_to_regexp $val].*$gdb_prompt $" {
	    pass $test
	} 
	-re "\\$\[0-9\]+ = $addr.*$gdb_prompt $" {
            fail "$test (prints just address)"
        }
	-re "\\$\[0-9\]+ = 0x\[a-f0-9\]+.*$gdb_prompt $" {
            fail "$test (prints unexpected address)"
        }
    }
    return 0
}

proc test_p_x_addr { var addr } {
    global gdb_prompt

    set test "print/x &$var"
    gdb_test_multiple $test $test {
        -re "\\$\[0-9\]+ = $addr.*$gdb_prompt $" {
	    pass $test
	} 
	-re "\\$\[0-9\]+ = 0x\[a-f0-9+\]+.*$gdb_prompt $" {
            fail "$test (prints unexpected address)"
        }
    }
    return 0
}

proc test_p_x_ref_addr { var addr } {
    global gdb_prompt

    set test "print/x *(&(&$var))"
    gdb_test_multiple $test $test {
        -re "\\$\[0-9\]+ = $addr.*$gdb_prompt $" {
	    pass $test
	}
	-re "Attempt to take address of value not located in memory.*$gdb_prompt $" {
	    # The reference might be in a register.  At least we parsed
	    # correctly...
	    pass $test
	}
	-re "\\$\[0-9\]+ = 0x\[a-f0-9+\]+.*$gdb_prompt $" {
            fail "$test (prints unexpected address)"
        }
    }
    return 0
}

proc test_p_op1_equals_op2 {op1 op2} {
    set test "print $op1 == $op2"
    gdb_test $test "\\$\[0-9\]+ = true"
}

runto ${srcfile}:[gdb_get_line_number "marker here"]

set s1_address  [get_address "s1"]
set e1_address  [get_address "e1"]
set i1_address  [get_address "i1"]

test_p_x "s" "Struct1 &" "{x = 0xd, y = 0x13}" $s1_address
test_p_x "e" "Enum1 &" "0xb" $e1_address
test_p_x "i" "int &" "0x17" $i1_address

test_p_x_addr "s" $s1_address
test_p_x_addr "e" $e1_address
test_p_x_addr "i" $i1_address

test_p_x_ref_addr "s" $s1_address
test_p_x_ref_addr "i" $i1_address
test_p_x_ref_addr "e" $e1_address

test_p_op1_equals_op2 "s.x" "13"