Test case for DW_OP_GNU_variable_value
gdb/testsuite/ChangeLog: * gdb.dwarf2/varval.c: New file. * gdb.dwarf2/varval.exp: New file.
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2018-08-18 Kevin Buettner <kevinb@redhat.com>
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* lib/dwarf.exp: Add support for DW_OP_GNU_variable_value.
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* gdb.dwarf2/varval.c: New file.
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* gdb.dwarf2/varval.exp: New file.
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2018-08-17 Alan Hayward <alan.hayward@arm.com>
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/* Copyright (C) 2018 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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/* Test program for DW_OP_GNU_variable_value. */
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int var_a = 8;
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int var_b = 3;
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int *var_p = &var_b;
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struct { int a, b, c, d, e, f, g, h; } var_s = { 101, 102, 103, 104, 105, 106, 107, 108 };
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int
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main (void)
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{
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asm ("main_label: .globl main_label");
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return 0;
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}
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# Copyright 2018 Free Software Foundation, Inc.
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Test support for DW_OP_GNU_variable_value.
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load_lib dwarf.exp
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# This test can only be run on targets which support DWARF-2 and use gas.
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if ![dwarf2_support] {
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return 0
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}
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# We'll place the output of Dwarf::assemble in varval.S.
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standard_testfile .c .S
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# ${testfile} is now "varval". srcfile2 is "varval.S".
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set executable ${testfile}
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set asm_file [standard_output_file ${srcfile2}]
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# We need to know the size of integer and address types in order
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# to write some of the debugging info we'd like to generate.
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#
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# For that, we ask GDB by debugging our varval program.
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# Any program would do, but since we already have varval
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# specifically for this testcase, might as well use that.
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if [prepare_for_testing "failed to prepare" ${testfile} ${srcfile}] {
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return -1
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}
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# Create the DWARF.
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Dwarf::assemble ${asm_file} {
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global srcdir subdir srcfile
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cu {} {
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DW_TAG_compile_unit {
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{DW_AT_language @DW_LANG_C_plus_plus}
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} {
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declare_labels int_label ptr_label struct_label var_a_label \
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var_b_label var_c_label var_p_label var_bad_label \
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varval_label var_s_label var_untyped_label
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set int_size [get_sizeof "int" -1]
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# gdb always assumes references are implemented as pointers.
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set addr_size [get_sizeof "void *" -1]
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int_label: DW_TAG_base_type {
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{DW_AT_byte_size ${int_size} DW_FORM_udata}
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{DW_AT_encoding @DW_ATE_signed}
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{DW_AT_name "int"}
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}
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ptr_label: DW_TAG_pointer_type {
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{DW_AT_type :$int_label}
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}
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var_a_label: DW_TAG_variable {
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{DW_AT_name "var_a"}
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{DW_AT_type :${int_label}}
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{DW_AT_external 1 DW_FORM_flag}
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{DW_AT_location {DW_OP_addr [gdb_target_symbol "var_a"]} SPECIAL_expr}
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}
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var_b_label: DW_TAG_variable {
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{DW_AT_name "var_b"}
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{DW_AT_type :${int_label}}
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{DW_AT_external 1 DW_FORM_flag}
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{DW_AT_location {DW_OP_addr [gdb_target_symbol "var_b"]} SPECIAL_expr}
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}
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var_c_label: DW_TAG_variable {
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{DW_AT_name "var_c"}
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{DW_AT_type :${int_label}}
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{DW_AT_external 1 DW_FORM_flag}
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{DW_AT_const_value 53 DW_FORM_sdata}
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}
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var_p_label: DW_TAG_variable {
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{DW_AT_name "var_p"}
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{DW_AT_type :${ptr_label}}
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{DW_AT_external 1 DW_FORM_flag}
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{DW_AT_location {DW_OP_addr [gdb_target_symbol "var_p"]} SPECIAL_expr}
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}
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var_bad_label: DW_TAG_variable {
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{DW_AT_name "var_bad"}
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{DW_AT_type :${int_label}}
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{DW_AT_external 1 DW_FORM_flag}
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}
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struct_label: DW_TAG_structure_type {
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{DW_AT_byte_size 8*$int_size DW_FORM_sdata}
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} {
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DW_TAG_member {
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{DW_AT_name "a"}
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{DW_AT_type :$int_label}
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{DW_AT_data_member_location 0*$int_size DW_FORM_udata}
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}
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DW_TAG_member {
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{DW_AT_name "b"}
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{DW_AT_type :$int_label}
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{DW_AT_data_member_location 1*$int_size DW_FORM_udata}
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}
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DW_TAG_member {
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{DW_AT_name "c"}
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{DW_AT_type :$int_label}
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{DW_AT_data_member_location 2*$int_size DW_FORM_udata}
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}
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DW_TAG_member {
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{DW_AT_name "d"}
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{DW_AT_type :$int_label}
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{DW_AT_data_member_location 3*$int_size DW_FORM_udata}
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}
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DW_TAG_member {
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{DW_AT_name "e"}
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{DW_AT_type :$int_label}
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{DW_AT_data_member_location 4*$int_size DW_FORM_udata}
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}
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DW_TAG_member {
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{DW_AT_name "f"}
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{DW_AT_type :$int_label}
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{DW_AT_data_member_location 5*$int_size DW_FORM_udata}
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}
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DW_TAG_member {
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{DW_AT_name "g"}
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{DW_AT_type :$int_label}
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{DW_AT_data_member_location 6*$int_size DW_FORM_udata}
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}
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DW_TAG_member {
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{DW_AT_name "h"}
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{DW_AT_type :$int_label}
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{DW_AT_data_member_location 7*$int_size DW_FORM_udata}
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}
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}
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var_s_label: DW_TAG_variable {
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{DW_AT_name "var_s"}
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{DW_AT_type :${struct_label}}
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{DW_AT_external 1 DW_FORM_flag}
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{DW_AT_location {DW_OP_addr [gdb_target_symbol "var_s"]} SPECIAL_expr}
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}
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var_untyped_label: DW_TAG_variable {
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{DW_AT_name "var_untyped"}
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{DW_AT_external 1 DW_FORM_flag}
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{DW_AT_location {DW_OP_addr [gdb_target_symbol "var_b"]} SPECIAL_expr}
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}
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DW_TAG_subprogram {
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{MACRO_AT_func { "main" "${srcdir}/${subdir}/${srcfile}" }}
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{DW_AT_type :${int_label}}
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{DW_AT_external 1 DW_FORM_flag}
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} {
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varval_label: DW_TAG_variable {
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{DW_AT_name "varval"}
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{DW_AT_type :${int_label}}
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{DW_AT_location {
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DW_OP_GNU_variable_value ${var_a_label}
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DW_OP_stack_value
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} SPECIAL_expr}
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}
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DW_TAG_variable {
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{DW_AT_name "constval"}
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{DW_AT_type :${int_label}}
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{DW_AT_location {
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DW_OP_GNU_variable_value ${var_c_label}
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DW_OP_stack_value
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} SPECIAL_expr}
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}
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DW_TAG_variable {
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{DW_AT_name "mixedval"}
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{DW_AT_type :${int_label}}
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{DW_AT_location {
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DW_OP_GNU_variable_value ${var_c_label}
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DW_OP_GNU_variable_value ${var_b_label}
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DW_OP_div
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DW_OP_GNU_variable_value ${varval_label}
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DW_OP_plus
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DW_OP_dup
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DW_OP_plus
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DW_OP_GNU_variable_value ${varval_label}
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DW_OP_minus
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DW_OP_stack_value
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} SPECIAL_expr}
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}
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DW_TAG_variable {
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{DW_AT_name "pointerval"}
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{DW_AT_type :${ptr_label}}
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{DW_AT_location {
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DW_OP_GNU_variable_value ${var_p_label}
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DW_OP_stack_value
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} SPECIAL_expr}
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}
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DW_TAG_variable {
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{DW_AT_name "badval"}
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{DW_AT_type :${int_label}}
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{DW_AT_location {
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DW_OP_GNU_variable_value ${var_bad_label}
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DW_OP_stack_value
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} SPECIAL_expr}
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}
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DW_TAG_variable {
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{DW_AT_name "structval"}
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{DW_AT_type :${struct_label}}
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{DW_AT_location {
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DW_OP_GNU_variable_value ${var_s_label}
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DW_OP_stack_value
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} SPECIAL_expr}
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}
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DW_TAG_variable {
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{DW_AT_name "untypedval"}
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{DW_AT_location {
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DW_OP_GNU_variable_value ${var_untyped_label}
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DW_OP_stack_value
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} SPECIAL_expr}
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}
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DW_TAG_variable {
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{DW_AT_name "bad_die_val1"}
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{DW_AT_location {
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DW_OP_GNU_variable_value 0xabcdef11
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DW_OP_stack_value
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} SPECIAL_expr}
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}
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DW_TAG_variable {
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{DW_AT_name "bad_die_val2"}
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{DW_AT_location {
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DW_OP_GNU_variable_value ${ptr_label}+1
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DW_OP_stack_value
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} SPECIAL_expr}
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}
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}
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}
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}
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}
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if [prepare_for_testing "failed to prepare" ${executable} [list ${asm_file} ${srcfile}] {}] {
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return -1
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}
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# DW_OP_GNU_variable_value implementation requires a valid frame.
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if ![runto_main] {
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return -1
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}
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gdb_test "print varval" "= 8"
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gdb_test "print constval" "= 53"
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gdb_test "print mixedval" "= 42"
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gdb_test "print pointerval" "= \\(int \\*\\) $hex <var_b>"
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gdb_test "print *pointerval" "= 3"
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gdb_test "print badval" "value has been optimized out"
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# Jakub says: "The intended behavior is that the debug info consumer
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# computes the value of that referenced variable at the current PC,
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# and if it can compute it and pushes the value as a generic type
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# integer into the DWARF stack (it is really only meaningful when
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# referring to integral/pointer typed variables)."
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gdb_test "print structval" \
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"Type of DW_OP_GNU_variable_value DIE must be an integer or pointer\\."
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gdb_test "print untypedval" \
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"Type of DW_OP_GNU_variable_value DIE must be an integer or pointer\\."
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gdb_test "print bad_die_val1" \
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"invalid dwarf2 offset 0xabcdef11"
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gdb_test "print bad_die_val2" \
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"Bad DW_OP_GNU_variable_value DIE\\."
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