gdb/testsuite/gdb.ada/uninitialized-variable-record.exp

# Copyright 2024-2025 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/>.

load_lib "ada.exp"

require allow_ada_tests

standard_ada_testfile parse

if {[gdb_compile_ada "${srcfile}" "${binfile}" executable {debug}] != "" } {
  return -1
}

clean_restart ${testfile}

set bp_location [gdb_get_line_number "START" ${testdir}/parse.adb]
runto "parse.adb:$bp_location"

# Check that we have the expected value for variable y2.

gdb_test "p y2" [string_to_regexp " = (a => false, c => 1.0, d => 2)"]

# Shorthand.

proc set_lang { lang } {
    gdb_test_multiple "set language $lang" "" {
	-re -wrap "" {
	}
    }
}

# Calculate the offset of y2.d.

set re_cast [string_to_regexp "(access integer)"]
gdb_test_multiple "print &y2.d - &y2" "" {
    -re -wrap " = $re_cast ($hex)" {
	set offset_d $expect_out(1,string)
	pass $gdb_test_name
    }
}

# Try to find a interesting discriminator value, such that at the same time:
# - the d field is part of the variable, and
# - the type size is too small to contain d.

set interesting_discriminator -1
set_lang c
for { set i 0 } { $i < 256 } { incr i } {
    with_test_prefix $i {

	# Patch in the discriminator value.
	gdb_test_multiple "set var *(unsigned char *)(&y2.a)=$i" "" {
	    -re -wrap "" {
	    }
	}

	# Check that we have the variant with fields c+d instead of b.
	set have_b 0
	gdb_test_multiple "with language ada -- print y2.b" "" {
	    -re -wrap " = $decimal" {
		set have_b 1
	    }
	    -re -wrap "" {
	    }
	}
	if { $have_b } {
	    # This is the variant with field b.
	    continue
	}

	set size 0
	gdb_test_multiple "print sizeof (y2)" "" {
	    -re -wrap " = (.*)" {
		set size $expect_out(1,string)
	    }
	}

	if { ! $size } {
	    continue
	}

	if { [expr $size > $offset_d] } {
	    # Field d fits in the size.
	    continue
	}

	set interesting_discriminator $i
	break
    }
}

require {expr $interesting_discriminator != -1}

foreach lang [gdb_supported_languages] {
    with_test_prefix $lang {
	set_lang $lang

	gdb_test_multiple "print y2" "" {
	    -re -wrap ", d => $decimal.*" {
		fail $gdb_test_name
	    }
	    -re -wrap ", d = $decimal.*" {
		fail $gdb_test_name
	    }
	    -re -wrap "" {
		pass $gdb_test_name
	    }
	}
    }
}