gdb/testsuite/gdb.cp/pass-by-ref-2.exp

# Copyright 2019-2021 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/>.

# Check that GDB can call C++ functions whose parameters have
# object type, and are either passed by value or implicitly by reference.
#
# This is a companion test to pass-by-ref.exp.  In this test, the input
# is manually-written.  In pass-by-ref.exp, the test input is generated.
#
# We include tests for classes that
# - contain arrays as fields,
# - are dynamic (i.e. have virtual methods)
# - have inlined copy ctor
# - have deleted destructor

if {[skip_cplus_tests]} {
    untested "c++ test skipped"
    continue
}

standard_testfile .cc

set options {debug c++ additional_flags=-std=c++11}
if {[prepare_for_testing "failed to prepare" $testfile $srcfile $options]} {
    return -1
}

if {![runto_main]} {
    return -1
}

# GCC version <= 6 and Clang do not emit DW_AT_defaulted and DW_AT_deleted.
set is_gcc_6_or_older [test_compiler_info {gcc-[0-6]-*}]
set is_clang [test_compiler_info {clang-*}]

set bp_location [gdb_get_line_number "stop here"]
gdb_breakpoint $bp_location
gdb_continue_to_breakpoint "end of main" ".*return .*;"

gdb_test "print cbvArrayContainerByVal (arrayContainerByVal)" "6" \
    "call cbvArrayContainerByVal"
gdb_test "print arrayContainerByVal.items\[0\].x" "2" \
    "cbv argument 'arrayContainerByVal' should not change"

gdb_test "print cbvArrayContainerByRef (arrayContainerByRef)" "7" \
    "call cbvArrayContainerByRef"
gdb_test "print arrayContainerByRef.items\[0\].x" "2" \
    "cbv argument 'arrayContainerByRef' should not change"

gdb_test "print cbvDynamic (dynamic)" "48" \
    "call cbvDynamic"
gdb_test "print dynamic.x" "2" \
    "cbv argument 'dynamic' should not change"

set sig "\"Inlined\:\:Inlined\\(.*Inlined const\&\\)\""
gdb_test "print cbvInlined (inlined)" \
    "expression cannot be evaluated .* \\(maybe inlined\\?\\)"

if {$is_gcc_6_or_older || $is_clang} {setup_xfail "*-*-*"}
gdb_test "print cbvDtorDel (*dtorDel)" \
    ".* cannot be evaluated .* 'DtorDel' is not destructible" \
    "type not destructible"

# Test that GDB calls the correct copy ctor
gdb_test "print cbvFourCCtor (fourCctor_c0v0)" "13" \
    "call cbvFourCCtor (c0v0)"
gdb_test "print fourCctor_c0v0.x" "2" \
    "cbv argument 'twoCctor_c0v0' should not change"

gdb_test "print cbvFourCCtor (fourCctor_c1v0)" "14" \
    "call cbvFourCCtor (c1v0)"
gdb_test "print fourCctor_c1v0.x" "2" \
    "cbv argument 'twoCctor_c1v0' should not change"

gdb_test "print cbvFourCCtor (fourCctor_c0v1)" "15" \
    "call cbvFourCCtor (c0v1)"
gdb_test "print fourCctor_c0v1.x" "2" \
    "cbv argument 'twoCctor_c0v1' should not change"

gdb_test "print cbvFourCCtor (fourCctor_c1v1)" "16" \
    "call cbvFourCCtor (c1v1)"
gdb_test "print fourCctor_c1v1.x" "2" \
    "cbv argument 'twoCctor_c1v1' should not change"

gdb_test "print cbvTwoMCtor (twoMctor)" \
    ".* cannot be evaluated .* 'TwoMCtor' is not copy constructible" \
    "copy ctor is implicitly deleted"

if {$is_gcc_6_or_older || $is_clang} {setup_xfail "*-*-*"}
gdb_test "print cbvTwoMCtorAndCCtor (twoMctorAndCctor)" "12" \
    "call cbvTwoMCtorAndCCtor"
gdb_test "print twoMctorAndCctor.x" "2" \
    "cbv argument 'twoMctorAndCtor' should not change"

# Test that we get a breakpoint from the cctor during infcall and
# we can examine arguments.  This is a test that the dummy frame
# of the copy constructor is set up correctly by the infcall mechanism.
set bp_location [gdb_get_line_number "ByRef-cctor"]
gdb_breakpoint $bp_location
gdb_test "print cbvArrayContainerByRef (arrayContainerByRef)" \
    ".*The program being debugged stopped.*" \
    "call cbvArrayContainerByRef with BP"
gdb_test "backtrace" [multi_line \
    "#0  ByRef\:\:ByRef .* at .*$srcfile:$bp_location" \
    "#1  .* ArrayContainerByRef::ArrayContainerByRef .*" \
    "#2  <function called from gdb>" \
    "#3  main.*"]