# Copyright 2019-2020 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/>.

# Import a CU into an "artificial" CU.  For each DW_TAG DIE in the
# artificial CU, use DW_AT_abstract_origin to refer to a DIE in the
# imported CU.  This DWARF file organization is frequently found in
# programs compiled with -flto (and -g) using GCC.
#
# This test reproduces the bug described in BZ 25065 without relying
# on specific compiler versions or use of optimization switches, in
# this case -flto.

if [skip_cplus_tests] {
    continue
}

load_lib dwarf.exp

# This test can only be run on targets which support DWARF-2 and use gas.
if {![dwarf2_support]} {
    return 0
};

standard_testfile .c .S

# ${testfile} is now "implref-struct".  srcfile2 is "implref-struct.S".
set executable ${testfile}
set asm_file [standard_output_file ${srcfile2}]

# We need to know the size of integer and address types in order
# to write some of the debugging info we'd like to generate.
if [prepare_for_testing "failed to prepare" ${testfile} ${srcfile} {debug c++}] {
    return -1
}

# Create the DWARF.
Dwarf::assemble $asm_file {
    declare_labels cu_label main_label doit_label int_label
    declare_labels Foo_label Foo_pointer_type doit_self_label
    declare_labels foo_label Foo_destructor_obj_pointer_label
    declare_labels Foo_constructor_obj_pointer_label
    set int_size [get_sizeof "int" 4]
    set addr_size [get_sizeof "void *" 8]

    global srcdir subdir srcfile

    extern main
    extern doit

    set main_range [function_range main ${srcdir}/${subdir}/${srcfile}]
    set main_start [lindex $main_range 0]
    set main_length [lindex $main_range 1]

    set doit_range [function_range doit ${srcdir}/${subdir}/${srcfile}]
    set doit_start [lindex $doit_range 0]
    set doit_length [lindex $doit_range 1]

    cu {} {
	compile_unit {
	    {language @DW_LANG_C_plus_plus}
	    {name "<artificial>"}
	} {
	    imported_unit {
		{import %$cu_label}
	    }
	    subprogram {
		{abstract_origin %$main_label}
		{low_pc $main_start addr}
		{high_pc "$main_start + $main_length" addr}
	    } {
		subprogram {
		    {abstract_origin %$doit_label}
		    {low_pc $doit_start addr}
		    {high_pc "$doit_start + $doit_length" addr}
		} {
		    formal_parameter {
			{abstract_origin %$doit_self_label}
		    }
		}
	        DW_TAG_variable {
		    {abstract_origin %$foo_label}
		    {location 4 data1}
		}
	    }
	}
    }

    cu {} {
	cu_label: compile_unit {
	    {language @DW_LANG_C_plus_plus}
	    {name "imported_unit.c"}
	} {
	    int_label: base_type {
		{byte_size $int_size sdata}
		{encoding @DW_ATE_signed}
		{name int}
	    }

	    main_label: subprogram {
		{name main}
		{type :$int_label}
		{external 1 flag}
	    } {
		Foo_label: class_type {
		    {name Foo}
		    {byte_size 1 sdata}
		} {
		    doit_label: subprogram {
			{name doit}
			{type :$int_label}
			{accessibility 1 DW_FORM_data1}
		    } {
			doit_self_label: formal_parameter {
			    {name this}
			    {artificial 1 DW_FORM_flag_present}
			    {type :$Foo_pointer_type}
			}
		    }
		    Foo_pointer_type: pointer_type {
			{byte_size $addr_size sdata}
			{type :$Foo_label}
		    }
		}
		foo_label: DW_TAG_variable {
		    {name foo}
		    {type :$Foo_label}
		}
	    }
	}
    }
}

if { [prepare_for_testing "failed to prepare" ${testfile} \
	  [list $srcfile $asm_file] {nodebug}] } {
    return -1
}

gdb_test_no_output "set language c++"

# Verify that the partial symtab for the unit importing the partial unit does
# not contain the static partial symbol int, which is defined in the partial
# unit.  Test-case for PR25646.
gdb_test "main print psymbols" \
    [multi_line \
	 "  Depends on 1 other partial symtabs\." \
	 "\[^\r\n\]*" \
	 "  Global partial symbols:" \
	 "    `main', function, $hex" \
	 "" \
	 ".*"] \
    "no static partial symbols in importing unit"

# Sanity check
gdb_test "ptype main" "= int \\(void\\)"

# Each of these tests caused a segfault prior to fixing BZ 25065.
gdb_test "ptype main::Foo" "= class Foo \{\\s+public:\\s+int doit\\(void\\);\\s+\}"
gdb_test "ptype main::foo" "= class Foo \{\\s+public:\\s+int doit\\(void\\);\\s+\}"