PR gdb/28480: Improve ambiguous member detection

[deliverable/binutils-gdb.git] / gdb / testsuite / gdb.cp / ambiguous.exp

# Copyright 1998-2021 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 file is part of the gdb testsuite

# Print out various class objects' members and check that the error
# about the field or baseclass being ambiguous is emitted at the right
# times.

if { [skip_cplus_tests] } { continue }

standard_testfile .cc

if [get_compiler_info "c++"] {
    unsupported "couldn't find a valid c++ compiler"
    return -1
}

set additional_flags ""
if {[test_compiler_info {gcc-[0-9]-*}]} {
    # GCCs prior to 10.1 do not support -Wno-inaccessible-base.
    set additional_flags "additional_flags=-w"
} elseif {[test_compiler_info gcc*] || [test_compiler_info clang*]} {
    set additional_flags "additional_flags=-Wno-inaccessible-base"
}

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

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

# Run to a breakpoint after the variables have been initialized so we
# can play with the variable values.

set lineno [gdb_get_line_number "set breakpoint here"]

gdb_breakpoint $lineno
gdb_continue_to_breakpoint "breakpoint here"

set number -?$decimal

with_test_prefix "all vars" {
    gdb_test "print a1" \
	" = \{x = 1, y = 2\}"

    gdb_test "print a2" \
	" = \{x = 1, y = 2\}"

    gdb_test "print a3" \
	" = \{x = 1, y = 2\}"

    gdb_test "print x" \
	" = \{<A1> = \{x = 1, y = 2\}, <A2> = \{x = 3, y = 4\}, z = 5\}"

    gdb_test "print l" \
	" = \{<A1> = \{x = 1, y = 2\}, z = 3\}"

    gdb_test "print m" \
	" = \{<A2> = \{x = 1, y = 2\}, w = 3\}"

    gdb_test "print n" \
	" = \{<L> = \{<A1> = \{x = 1, y = 2\}, z = 7\}, <M> = \{<A2> = \{x = 3, y = 4\}, w = 5\}, r = 6\}"

    gdb_test "print k" \
	" = \{<A1> = \{x = 1, y = 2\}, i = 3\}"

    gdb_test "print j" \
	" = {<K> = {<A1> = {x = 1, y = 2}, i = 5}, <L> = {<A1> = {x = 3, y = 4}, z = 6}, j = 7}"

    gdb_test "print jv" \
	" = \{<KV> = \{<A1> = \{x = 1, y = 2\}, _vptr.KV = $hex <vtable for JV.*>, i = 3\}, <LV> = \{_vptr.LV = $hex <VTT for JV>, z = 4\}, jv = 5\}"

    # No way to initialize one of the A1's, so just take any number there.
    gdb_test "print jva1" \
	" = \{<KV> = \{<A1> = \{x = 3, y = 4\}, _vptr.KV = $hex <vtable for JVA1.*>, i = 6\}, <LV> = \{_vptr.LV = $hex <VTT for JVA1>, z = 5\}, <A1> = \{x = $number, y = $number\}, jva1 = 7\}"

    gdb_test "print jva2" \
	" = \{<KV> = \{<A1> = \{x = 3, y = 4\}, _vptr.KV = $hex <vtable for JVA2.*>, i = 8\}, <LV> = \{_vptr.LV = $hex <VTT for JVA2>, z = 7\}, <A2> = \{x = 5, y = 6\}, jva2 = 9\}"

    gdb_test "print jva1v" \
	" = \{<KV> = \{<A1> = \{x = 1, y = 2\}, _vptr.KV = $hex <vtable for JVA1V+.*>, i = 4\}, <LV> = \{_vptr.LV = $hex <VTT for JVA1V>, z = 3\}, jva1v = 5\}"
}

# Check that we can access all the fields correctly, using the same
# syntax as used in the .cc file.  Keep the order here in sync with
# the .cc file.
with_test_prefix "all fields" {
    gdb_test "print a1.x" " = 1"
    gdb_test "print a1.y" " = 2"

    gdb_test "print a2.x" " = 1"
    gdb_test "print a2.y" " = 2"

    gdb_test "print a3.x" " = 1"
    gdb_test "print a3.y" " = 2"

    gdb_test "print x.A1::x" " = 1"
    gdb_test "print x.A1::y" " = 2"
    gdb_test "print x.A2::x" " = 3"
    gdb_test "print x.A2::y" " = 4"
    gdb_test "print x.z" " = 5"

    gdb_test "print l.x" " = 1"
    gdb_test "print l.y" " = 2"
    gdb_test "print l.z" " = 3"

    gdb_test "print m.x" " = 1"
    gdb_test "print m.y" " = 2"
    gdb_test "print m.w" " = 3"

    gdb_test "print n.A1::x" " = 1"
    gdb_test "print n.A1::y" " = 2"
    gdb_test "print n.A2::x" " = 3"
    gdb_test "print n.A2::y" " = 4"
    gdb_test "print n.w" " = 5"
    gdb_test "print n.r" " = 6"
    gdb_test "print n.z" " = 7"

    gdb_test "print k.x" " = 1"
    gdb_test "print k.y" " = 2"
    gdb_test "print k.i" " = 3"

    gdb_test "print j.K::x" " = 1"
    gdb_test "print j.K::y" " = 2"
    gdb_test "print j.L::x" " = 3"
    gdb_test "print j.L::y" " = 4"
    gdb_test "print j.i" " = 5"
    gdb_test "print j.z" " = 6"
    gdb_test "print j.j" " = 7"

    gdb_test "print jv.x" " = 1"
    gdb_test "print jv.y" " = 2"
    gdb_test "print jv.i" " = 3"
    gdb_test "print jv.z" " = 4"
    gdb_test "print jv.jv" " = 5"

    setup_kfail "c++/26550" *-*-*
    gdb_test "print jva1.KV::x" " = 1"
    setup_kfail "c++/26550" *-*-*
    gdb_test "print jva1.KV::y" " = 2"
    setup_kfail "c++/26550" *-*-*
    gdb_test "print jva1.LV::x" " = 3"
    setup_kfail "c++/26550" *-*-*
    gdb_test "print jva1.LV::y" " = 4"
    gdb_test "print jva1.z" " = 5"
    gdb_test "print jva1.i" " = 6"
    gdb_test "print jva1.jva1" "= 7"

    setup_kfail "c++/26550" *-*-*
    gdb_test "print jva2.KV::x" " = 1"
    setup_kfail "c++/26550" *-*-*
    gdb_test "print jva2.KV::y" " = 2"
    setup_kfail "c++/26550" *-*-*
    gdb_test "print jva2.LV::x" " = 3"
    setup_kfail "c++/26550" *-*-*
    gdb_test "print jva2.LV::y" " = 4"
    gdb_test "print jva2.A2::x" " = 5"
    gdb_test "print jva2.A2::y" " = 6"
    gdb_test "print jva2.z" " = 7"
    gdb_test "print jva2.i" " = 8"
    gdb_test "print jva2.jva2" "= 9"

    gdb_test "print jva1v.x" " = 1"
    gdb_test "print jva1v.y" " = 2"
    gdb_test "print jva1v.z" " = 3"
    gdb_test "print jva1v.i" " = 4"
    gdb_test "print jva1v.jva1v" " = 5"
}

# Test that printing WHAT reports an error about FIELD being ambiguous
# in TYPE, and that the candidates are CANDIDATES.
proc test_ambiguous {what field type candidates} {
    set msg "Request for member '$field' is ambiguous in type '$type'. Candidates are:"

    foreach c $candidates {
	set c_re [string_to_regexp $c]
	append msg "\r\n  $c_re"
    }

    gdb_test "print $what" $msg
}

# X is derived from A1 and A2; both A1 and A2 have a member 'x'
test_ambiguous "x.x" "x" "X" {
    "'int A1::x' (X -> A1)"
    "'int A2::x' (X -> A2)"
}

# N is derived from A1 and A2, but not immediately -- two steps
# up in the hierarchy. Both A1 and A2 have a member 'x'.
test_ambiguous "n.x" "x" "N" {
    "'int A1::x' (N -> L -> A1)"
    "'int A2::x' (N -> M -> A2)"
}

# J is derived from A1 twice.  A1 has a member x.
test_ambiguous "j.x" "x" "J" {
    "'int A1::x' (J -> K -> A1)"
    "'int A1::x' (J -> L -> A1)"
}

# JV is derived from A1 but A1 is a virtual base. Should not
# report an ambiguity in this case.
gdb_test "print jv.x" " = 1"

# JVA1 is derived from A1; A1 occurs as a virtual base in two
# ancestors, and as a non-virtual immediate base. Ambiguity must
# be reported.
test_ambiguous "jva1.x" "x" "JVA1" {
    "'int A1::x' (JVA1 -> KV -> A1)"
    "'int A1::x' (JVA1 -> A1)"
}

# JVA2 is derived from A1 & A2; A1 occurs as a virtual base in two
# ancestors, and A2 is a non-virtual immediate base. Ambiguity must
# be reported as A1 and A2 both have a member 'x'.
test_ambiguous "jva2.x" "x" "JVA2" {
    "'int A1::x' (JVA2 -> KV -> A1)"
    "'int A2::x' (JVA2 -> A2)"
}

# JVA1V is derived from A1; A1 occurs as a virtual base in two
# ancestors, and also as a virtual immediate base. Ambiguity must
# not be reported.
gdb_test "print jva1v.x" " = 1"

# Now check for ambiguous bases.

# J is derived from A1 twice; report ambiguity if a J is
# cast to an A1.
gdb_test "print (A1)j" "base class 'A1' is ambiguous in type 'J'"

# JV is derived from A1 twice, but A1 is a virtual base; should
# not report ambiguity when a JV is cast to an A1.
gdb_test "print (A1)jv" " = {x = 1, y = 2}"

# JVA1 is derived from A1; A1 is a virtual base and also a
# non-virtual base.  Must report ambiguity if a JVA1 is cast to an A1.
gdb_test "print (A1)jva1" "base class 'A1' is ambiguous in type 'JVA1'"

# Add an intermediate cast to KV, and it should work.
setup_kfail "c++/26550" *-*-*
gdb_test "print (KV)jva1" " = \{<A1> = \{x = 3, y = 4\}, _vptr.KV = $hex <VTT for KV>, i = 6\}"
setup_kfail "c++/26550" *-*-*
gdb_test "print (A1)(KV)jva1" " = \{x = 3, y = 4\}"

# JVA1V is derived from A1; A1 is a virtual base indirectly
# and also directly; must not report ambiguity when a JVA1V is cast to an A1.
gdb_test "print (A1)jva1v" " = {x = 1, y = 2}"

# C++20 introduced a way to have ambiguous fields with the same byte offset.
# This class explicitly tests for that.
# if this is tested with a compiler that can't handle [[no_unique_address]]
# the code should still correctly identify the ambiguity because of
# different byte offsets.
test_ambiguous "je.x" "x" "JE" {
    "'int A1::x' (JE -> A1)"
    "'empty A4::x' (JE -> A4)"
}