gdb/testsuite/gdb.dwarf2/fission-multi-cu.exp

# Copyright 2012-2021 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 test checks that GDB can load DWARF information from two
# separate split .DWO files.

load_lib dwarf.exp

# We run objcopy locally to split out the .dwo file.
if [is_remote host] {
    return 0
}

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

# We place the entire source code for the test into a single .c file,
# but we generate the DWARF in two separate .S files.  Each .S is
# compiled to a .o, then the DWARF is split into a .dwo file.  Finally
# the all three .o files are merged into a single executable that will
# reference the two .dwo files.
standard_testfile .c -1-dw.S -2-cw.S

# Generate the first .S file.
set asm_file_1 [standard_output_file $srcfile2]
Dwarf::assemble $asm_file_1 {
    global srcfile binfile objdir srcdir subdir

    get_func_info func

    declare_labels int4_type lines_table

    set debug_addr_lbl ".unknown!!"

    # The information that will be split out into the .dwo file.
    cu {fission 1} {

	# Capture a label to the current start of the .debug_addr
	# section.  This will be passed to DW_AT_GNU_addr_base in the
	# non-split CU later.
	set debug_addr_lbl [debug_addr_label]

	compile_unit {
            {language @DW_LANG_C}
            {name ${srcfile}}
	    {DW_AT_comp_dir ${objdir}}
	    {DW_AT_GNU_dwo_id 0x1234 DW_FORM_data8}
        } {
	    int4_type: DW_TAG_base_type {
		{DW_AT_byte_size 4 DW_FORM_sdata}
		{DW_AT_encoding  @DW_ATE_signed}
		{DW_AT_name      int}
	    }

	    subprogram {
		{external 1 flag}
		{DW_AT_name func DW_FORM_string}
		{MACRO_AT_func {func}}
		{DW_AT_type :$int4_type}
	    } {
		DW_TAG_formal_parameter {
		    {DW_AT_name arg}
		    {DW_AT_type :$int4_type}
		    {DW_AT_location {
			DW_OP_GNU_addr_index [gdb_target_symbol global_param]
		    } SPECIAL_expr}
		}
	    }
	}
    }

    lines {version 2} lines_table {
	include_dir "${srcdir}/${subdir}"
	file_name "$srcfile" 1

	program {
	    {DW_LNE_set_address $func_start}
	    {DW_LNS_advance_line 24}
	    {DW_LNS_copy}

	    {DW_LNE_set_address line_label_4}
	    {DW_LNS_advance_line 3}
	    {DW_LNS_copy}

	    {DW_LNE_set_address $func_end}
	    {DW_LNS_advance_line 1}
	    {DW_LNS_copy}
	    {DW_LNE_end_sequence}
	}
    }

    # The information that will remain in the .o file.
    cu {} {
	compile_unit {
            {DW_AT_GNU_dwo_name ${binfile}-1-dw.dwo DW_FORM_strp}
	    {DW_AT_comp_dir ${objdir}}
	    {DW_AT_GNU_dwo_id 0x1234 DW_FORM_data8}
	    {DW_AT_GNU_addr_base $debug_addr_lbl}
	    {stmt_list $lines_table DW_FORM_sec_offset}
        } {
	    # Nothing.
	}
    }
}

# Generate the second .S file.
set asm_file_2 [standard_output_file $srcfile3]
Dwarf::assemble $asm_file_2 {
    global srcfile binfile objdir srcdir subdir

    set debug_addr_lbl ".unknown!!"

    declare_labels int4_type lines_table

    get_func_info main

    # The information that will be split out into the .dwo file.
    cu {fission 1} {

	# Capture a label to the current start of the .debug_addr
	# section.  This will be passed to DW_AT_GNU_addr_base in the
	# non-split CU later.
	set debug_addr_lbl [debug_addr_label]

	compile_unit {
            {language @DW_LANG_C}
            {name ${srcfile}}
	    {DW_AT_comp_dir ${objdir}}
	    {DW_AT_GNU_dwo_id 0x4567 DW_FORM_data8}
        } {
	    int4_type: DW_TAG_base_type {
		{DW_AT_byte_size 4 DW_FORM_sdata}
		{DW_AT_encoding  @DW_ATE_signed}
		{DW_AT_name      int}
	    }

	    subprogram {
		{external 1 flag}
		{DW_AT_name main DW_FORM_string}
		{MACRO_AT_func {main}}
		{DW_AT_type :$int4_type}
		{DW_AT_decl_file 1 data1}
		{DW_AT_decl_line 29 data1}
	    }
	}
    }

    lines {version 2} lines_table {
	include_dir "${srcdir}/${subdir}"
	file_name "$srcfile" 1

	program {
	    {DW_LNE_set_address $main_start}
	    {DW_LNS_advance_line 32}
	    {DW_LNS_copy}

	    {DW_LNE_set_address line_label_1}
	    {DW_LNS_advance_line 3}
	    {DW_LNS_copy}

	    {DW_LNE_set_address line_label_2}
	    {DW_LNS_advance_line 2}
	    {DW_LNS_copy}

	    {DW_LNE_set_address line_label_3}
	    {DW_LNS_advance_line 2}
	    {DW_LNS_copy}

	    {DW_LNE_set_address $main_end}
	    {DW_LNS_advance_line 2}
	    {DW_LNS_copy}
	    {DW_LNE_end_sequence}
	}
    }

    # The information that will remain in the .o file.
    cu {} {
	compile_unit {
            {DW_AT_GNU_dwo_name ${binfile}-2-dw.dwo DW_FORM_strp}
	    {DW_AT_comp_dir ${objdir}}
	    {DW_AT_GNU_dwo_id 0x4567 DW_FORM_data8}
	    {DW_AT_GNU_addr_base $debug_addr_lbl}
	    {stmt_list $lines_table DW_FORM_sec_offset}
        } {
	    # Nothing.
	}
    }
}

# Compile all of the input files, split the DWARF into the .dwo files.
set obj1 [standard_output_file "${testfile}-1-dw.o"]
set obj2 [standard_output_file "${testfile}-2-dw.o"]
if [build_executable_and_dwo_files "$testfile.exp" "${binfile}" {nodebug} \
	[list $asm_file_1 [list nodebug split-dwo] $obj1] \
	[list $asm_file_2 [list nodebug split-dwo] $obj2] \
	[list $srcfile  [list nodebug]]] {
    return -1
}

clean_restart $binfile

if ![runto_main] {
    return -1
}

# Do a few basic things to verify we're finding the DWO debug info.

gdb_test "ptype main" "type = int \\(\\)"
gdb_test "ptype func" "type = int \\(int\\)"

gdb_test "frame" "#0 *main \\(\\) at \[^\r\n\]+${srcfile}:$decimal.*" \
    "frame in main"

gdb_test "break func" "Breakpoint.*at.* file .*${srcfile}, line .*"

gdb_test "continue" "Breakpoint.* func \\(arg=-1\\).*" \
    "continue to func"

gdb_test "frame" "#0 *func \\(arg=-1\\) at \[^\r\n\]+${srcfile}:$decimal.*" \
    "frame in func"