# Copyright 2013-2020 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/>.

# Test namespace aliases.
# PRs c++/7935, c++/10541

load_lib dwarf.exp

if {![dwarf2_support]} {
    return 0
}

if {[skip_cplus_tests]} {
    continue
}

standard_testfile .cc nsalias-dw.S

# Make the DWARF used for the test.  This is necessary to work
# around compiler issues.  Not all versions of gcc output the
# correct debuginfo we need.
#
# This should create the equivalent DWARF to:
#
# namespace outer
# {
#   namespace inner
#   {
#     namespace innermost
#     {
#       const int x = 2;
#       int foo (void) { return x; }
#     }
#
#     namespace Innermost = innermost;
#
#     const int x = 1;
#     int foo (void) { return x + Innermost::foo (); }
#   }
#
#   namespace Inner = inner;
#
#   const int x = 0;
#   int foo (void) { return x + Inner::foo (); }
# }
#
# namespace Outer = outer;
# namespace oi = Outer::Inner;

set asm_file [standard_output_file $srcfile2]
Dwarf::assemble $asm_file {
    cu {} {
	compile_unit {{language @DW_LANG_C_plus_plus}} {
	    declare_labels int_label outer_label inner_label innermost_label
	    declare_labels im_foo_label i_foo_label o_foo_label
	    declare_labels OuterInner_label oi1_label oi2_label

	    int_label: base_type {
		{name int}
		{encoding @DW_ATE_signed}
		{byte_size 4 DW_FORM_sdata}
	    }

	    outer_label: DW_TAG_namespace {
		{name outer}
	    } {
		inner_label: DW_TAG_namespace {
		    {name inner}
		} {
		    innermost_label: DW_TAG_namespace {
			{name innermost}
		    } {
			DW_TAG_variable {
			    {name x}
			    {type :$int_label}
			    {const_value 2 DW_FORM_data1}
			}

			im_foo_label: DW_TAG_subprogram {
			    {name foo}
			    {external 1 flag_present}
			    {declaration 1 flag_present}
			}
		    }

		    imported_declaration {
			{name Innermost}
			{import :$innermost_label}
		    }

		    DW_TAG_variable {
			{name x}
			{type :$int_label}
			{const_value 1 DW_FORM_data1}
		    }

		    i_foo_label: subprogram {
			{name foo}
			{external 1 flag_present}
			{declaration 1 flag_present}
		    }
		}

		OuterInner_label: imported_declaration {
		    {name Inner}
		    {import :$inner_label}
		}

		DW_TAG_variable {
		    {name x}
		    {type :$int_label}
		    {const_value 0 DW_FORM_data1}
		}

		o_foo_label: subprogram {
		    {name foo}
		    {external 1 flag_present}
		    {declaration 1 flag_present}
		}
	    }

	    imported_declaration {
		{name Outer}
		{import :$outer_label}
	    }

	    oi1_label: imported_declaration {
		{name oi1}
		{import :$OuterInner_label}
	    }

	    oi2_label: imported_declaration {
		{name oi2}
		{import :$oi1_label}
	    }

	    imported_declaration {
		{name oi3}
		{import :$oi2_label}
	    }

	    subprogram {
		{specification :$im_foo_label}
		{low_pc 0x4 DW_FORM_addr}
		{high_pc 0x7 DW_FORM_addr}
	    }

	    subprogram {
		{specification :$i_foo_label}
		{low_pc 0x8 DW_FORM_addr}
		{high_pc 0xb DW_FORM_addr}
	    }

	    subprogram {
		{specification :$o_foo_label}
		{low_pc 0xc DW_FORM_addr}
		{high_pc 0xf DW_FORM_addr}
	    }
	}
    }
}

if {[gdb_compile $srcdir/$subdir/$srcfile ${binfile}1.o \
	 object {c++ debug}] != ""} {
    return -1
}

if {[gdb_compile $asm_file ${binfile}2.o object {nodebug}] != ""} {
    return -1
}

if {[gdb_compile [list ${binfile}1.o ${binfile}2.o] \
	 $binfile executable {c++}] != ""} {
    return -1
}

clean_restart $testfile

# A procedure to run various tests on aliased namespaces.
proc do_alias_tests {ns {real ""} {x ""}} {

    # The "real" namespace is simply NS in all lowercase.
    if {$real == ""} {
	set real [string tolower $ns]
    }

    # The value of `x' is the number of '::' in NS.
    if {$x == ""} {
	set x [expr {[llength [split $ns ":"]] / 2}]
    }

    # Test "whatis"
    gdb_test "whatis $ns" "type = $real"

    # Test "ptype"
    gdb_test "ptype $ns" "type = namespace $real"

    # Print 'x'
    send_log "expecting x = $x\n"
    gdb_test "print ${ns}::x" " = $x"

    # Attempt to list the function.
    gdb_test_no_output "list ${ns}::foo"

    # Attempt to break on the start of the function.
    gdb_breakpoint "*${ns}::foo"

    # And then erase it
    with_test_prefix "($ns)" {
	gdb_test_no_output "delete \$bpnum"
    }
}

# This is a list of all the permutations to be tested.  For troubleshooting
# purposes, this list is explicitly enumerated.

set permutations {}
lappend permutations "outer"
lappend permutations "Outer"
lappend permutations "outer::inner"
lappend permutations "Outer::inner"
lappend permutations "outer::Inner"
lappend permutations "Outer::Inner"
lappend permutations "outer::inner::innermost"
lappend permutations "outer::inner::Innermost"
lappend permutations "outer::Inner::innermost"
lappend permutations "outer::Inner::Innermost"
lappend permutations "Outer::inner::innermost"
lappend permutations "Outer::inner::Innermost"
lappend permutations "Outer::Inner::innermost"
lappend permutations "Outer::Inner::Innermost"

foreach p $permutations {
    do_alias_tests $p
}

# Test recursively imported aliases.
foreach ns {"oi1" "oi2" "oi3"} {
    do_alias_tests $ns "outer::inner" 1
    do_alias_tests "${ns}::innermost" "outer::inner::innermost" 2
    do_alias_tests "${ns}::Innermost" "outer::inner::innermost" 2
}

# Generate another objfile with nested imported declarations.

set imports {
    declare_labels n0_label

    n0_label: DW_TAG_namespace {
	{name n0}
    } {
	DW_TAG_variable {
	    {name x}
	    {type :$int_label}
	    {const_value 3 DW_FORM_data1}
	}
    }

    declare_labels n0_import
    n0_import: imported_declaration {
	{name N0}
	{import :$n0_label}
    }
}

for {set i 1} {$i <= 100} {incr i} {
    append imports [format "
	declare_labels n%d_import
	n%d_import: imported_declaration {
	    {name N%d}
	    {import :\$n%d_import}
	}" $i $i $i [expr {$i - 1}]]
}

standard_testfile .cc nsalias-r-dw.S

set asm_file [standard_output_file $srcfile2]
set the_dwarf [format {
    cu {} {
	compile_unit {{language @DW_LANG_C_plus_plus}} {
	    declare_labels int_label n0_label

	    int_label: base_type {
		{name int}
		{encoding @DW_ATE_signed}
		{byte_size 4 DW_FORM_sdata}
	    }

%s
	}
    }
} $imports]

Dwarf::assemble $asm_file $the_dwarf

if {[gdb_compile $asm_file ${binfile}3.o object {nodebug}] != ""} {
    return -1
}

if {[gdb_compile [list ${binfile}1.o ${binfile}3.o] \
	 ${binfile}-r executable {c++}] != ""} {
    return -1
}

clean_restart ${testfile}-r

gdb_test_no_output "set complaints 1"
gdb_test "print N100::x" \
    ".* has too many recursively imported declarations.*" \
    "compaint for too many recursively imported declarations"