gdb/testsuite/gdb.dwarf2/opaque-type-lookup.exp

# Copyright 2013-2021 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/>.

# Test PR 18258.

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 main.c -1.S -2.c

# Create the DWARF.
set asm_file [standard_output_file $srcfile2]
Dwarf::assemble $asm_file {
    declare_labels partial_unit_defining_a partial_unit_defining_b
    declare_labels partial_unit_with_opaque
    declare_labels struct_a_label struct_b_label
    declare_labels opaque_struct_a_label opaque_struct_b_label
    declare_labels char_type1_label char_type2_label

    # The partial units are laid out so we're not dependent on the order that
    # they appear in compunit_symtab.includes.  We need the one with the
    # opaque definition to appear first to gdb, so we put it in the middle.
    # Either the handling of variable_a or variable_b will be broken (in an
    # unpatched gdb).
    #
    # However, once a partial unit with a non-opaque type is read in we can
    # no longer see the bug as gdb will keep looking until it eventually gets
    # to the defining partial unit, setting aside the symbol lookup cache.
    # So heads up!

    cu {} {
	compile_unit {
	    {language @DW_LANG_C}
	    {name opaque_before}
	} {
	    imported_unit {
		{import $partial_unit_with_opaque ref_addr}
	    }

	    imported_unit {
		{import $partial_unit_defining_a ref_addr}
	    }
	}
    }

    cu {} {
	compile_unit {
	    {language @DW_LANG_C}
	    {name opaque_after}
	} {
	    imported_unit {
		{import $partial_unit_defining_b ref_addr}
	    }

	    imported_unit {
		{import $partial_unit_with_opaque ref_addr}
	    }
	}
    }

    cu {} {
	partial_unit_with_opaque: partial_unit {
	    {name "partial_unit_with_opaque"}
	} {
	    # Normally gdb doesn't add opaque types to the symbol table
	    # but there are times when it will, and in order to exercise
	    # this bug we need this entry in the symbol table.
	    # By giving it a size of 1 we achieve this.

	    opaque_struct_a_label: structure_type {
		{name struct_a}
		{declaration 1 flag}
		{byte_size 1 DW_FORM_sdata}
	    }

	    opaque_struct_b_label: structure_type {
		{name struct_b}
		{declaration 1 flag}
		{byte_size 1 DW_FORM_sdata}
	    }

	    DW_TAG_variable {
		{name variable_a}
		{type :$opaque_struct_a_label}
		{external 1 flag}
		{declaration 1 flag}
	    }

	    DW_TAG_variable {
		{name variable_b}
		{type :$opaque_struct_b_label}
		{external 1 flag}
		{declaration 1 flag}
	    }
	}
    }

    cu {} {
	partial_unit_defining_a: partial_unit {
	    {name "partial_unit_defining_a"}
	} {
	    char_type1_label: base_type {
		{name "signed char"}
		{encoding @DW_ATE_signed}
		{byte_size 1 DW_FORM_sdata}
	    }

	    struct_a_label: structure_type {
		{name struct_a}
		{byte_size 1 DW_FORM_sdata}
	    } {
		member {
		    {name xyz}
		    {type :$char_type1_label}
		    {data_member_location 0 DW_FORM_sdata}
		}
	    }

	    DW_TAG_variable {
		{name variable_a}
		{type :$struct_a_label}
		{external 1 flag}
		{linkage_name variable_a}
	    }
	}
    }

    cu {} {
	partial_unit_defining_b: partial_unit {
	    {name "partial_unit_defining_b"}
	} {
	    char_type2_label: base_type {
		{name "signed char"}
		{encoding @DW_ATE_signed}
		{byte_size 1 DW_FORM_sdata}
	    }

	    struct_b_label: structure_type {
		{name struct_b}
		{byte_size 1 DW_FORM_sdata}
	    } {
		member {
		    {name xyz}
		    {type :$char_type2_label}
		    {data_member_location 0 DW_FORM_sdata}
		}
	    }

	    DW_TAG_variable {
		{name variable_b}
		{type :$struct_b_label}
		{external 1 flag}
		{linkage_name variable_b}
	    }
	}
    }

    # GDB expands the symbol table with main at start up,
    # so keep this separate.
    cu {} {
	compile_unit {
	    {language @DW_LANG_C}
	    {name main}
	} {
	    subprogram {
		{MACRO_AT_func { main }}
	    }
	}
    }
}

if [prepare_for_testing "failed to prepare" $testfile "${asm_file} ${srcfile} ${srcfile3}" {nodebug}] {
    return -1
}

if ![runto_main] {
    return -1
}

gdb_test "p variable_a" " = {xyz = 97 'a'}"
gdb_test "p variable_b" " = {xyz = 98 'b'}"