| # Copyright 2016 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 a C++ reference marked with DW_OP_GNU_implicit_pointer. |
| # The referenced value is a global struct whose location is a DW_OP_addr. |
| |
| 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 |
| } |
| |
| # We'll place the output of Dwarf::assemble in implref-struct.S. |
| 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. |
| # |
| # For that, we ask GDB by debugging our implref-struct program. |
| # Any program would do, but since we already have implref-struct |
| # specifically for this testcase, might as well use that. |
| if [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile} {debug c++}] { |
| untested ${testfile}.exp |
| return -1 |
| } |
| |
| # Create the DWARF. We need a regular variable for the struct and a reference |
| # to it that'll be marked with DW_OP_GNU_implicit_pointer. The variable must be |
| # global so that its name is an exported symbol that can we can reference from |
| # the DWARF using gdb_target_symbol. |
| Dwarf::assemble ${asm_file} { |
| global srcdir subdir srcfile |
| |
| cu {} { |
| DW_TAG_compile_unit { |
| {DW_AT_language @DW_LANG_C_plus_plus} |
| } { |
| declare_labels int_label struct_label variable_label ref_label |
| set int_size [get_sizeof "int" -1] |
| |
| # gdb always assumes references are implemented as pointers. |
| set addr_size [get_sizeof "void *" -1] |
| set S_size [get_sizeof "S" -1] |
| |
| # The compiler shouldn't introduce structure padding here. |
| set b_offset 4 |
| set c_offset 8 |
| |
| int_label: DW_TAG_base_type { |
| {DW_AT_byte_size ${int_size} DW_FORM_udata} |
| {DW_AT_encoding @DW_ATE_signed} |
| {DW_AT_name "int"} |
| } |
| |
| struct_label: DW_TAG_structure_type { |
| {DW_AT_name "S"} |
| {DW_AT_byte_size ${S_size} DW_FORM_udata} |
| } { |
| DW_TAG_member { |
| {DW_AT_name "a"} |
| {DW_AT_type :${int_label}} |
| {DW_AT_data_member_location 0 DW_FORM_udata} |
| } |
| |
| DW_TAG_member { |
| {DW_AT_name "b"} |
| {DW_AT_type :${int_label}} |
| {DW_AT_data_member_location ${b_offset} DW_FORM_udata} |
| } |
| |
| DW_TAG_member { |
| {DW_AT_name "c"} |
| {DW_AT_type :${int_label}} |
| {DW_AT_data_member_location ${c_offset} DW_FORM_udata} |
| } |
| } |
| |
| ref_label: DW_TAG_reference_type { |
| {DW_AT_byte_size ${addr_size} DW_FORM_udata} |
| {DW_AT_type :${struct_label}} |
| } |
| |
| variable_label: DW_TAG_variable { |
| {DW_AT_name "s1"} |
| {DW_AT_type :${struct_label}} |
| {DW_AT_external 1 DW_FORM_flag} |
| {DW_AT_location {DW_OP_addr [gdb_target_symbol "s1"]} SPECIAL_expr} |
| } |
| |
| DW_TAG_variable { |
| {DW_AT_name "s2"} |
| {DW_AT_type :${struct_label}} |
| {DW_AT_external 1 DW_FORM_flag} |
| {DW_AT_location {DW_OP_addr [gdb_target_symbol "s2"]} SPECIAL_expr} |
| } |
| |
| DW_TAG_subprogram { |
| {MACRO_AT_func { "main" "${srcdir}/${subdir}/${srcfile}" }} |
| {DW_AT_type :${int_label}} |
| {DW_AT_external 1 DW_FORM_flag} |
| } { |
| DW_TAG_variable { |
| {DW_AT_name "ref"} |
| {DW_AT_type :${ref_label}} |
| {DW_AT_location {DW_OP_GNU_implicit_pointer ${variable_label} 0} SPECIAL_expr} |
| } |
| } |
| } |
| } |
| } |
| |
| if [prepare_for_testing ${testfile}.exp ${executable} [list ${asm_file} ${srcfile}] {}] { |
| return -1 |
| } |
| |
| # DW_OP_GNU_implicit_pointer implementation requires a valid frame. |
| if ![runto_main] { |
| return -1 |
| } |
| |
| # Returns the struct members, e.g. '{a = 0, b = 1, c = 2}'. |
| proc get_members {var} { |
| set members [get_valueof "" ${var} ""] |
| |
| # Trim leading/trailing whitespace, '{' and '}' since they confuse TCL to no end. |
| set members [string trim ${members}] |
| set members [string trim ${members} "{}"] |
| |
| return ${members} |
| } |
| |
| # Values of the struct members. |
| set s1_members [get_members "s1"] |
| set s2_members [get_members "s2"] |
| |
| # Address of the referenced value. |
| set address [get_hexadecimal_valueof "&s1" ""] |
| |
| # Test printing with both 'set print object off' and 'on', just to make sure |
| # the output doesn't change. |
| foreach_with_prefix print-object {"off" "on"} { |
| gdb_test_no_output "set print object ${print-object}" |
| |
| # Doing 'print ref' should show us e.g. |
| # '(S &) @0xdeadbeef: {a = 0, b = 1, c = 2}'. |
| gdb_test "print ref" " = \\(S &\\) @${address}: \\{${s1_members}\\}" |
| |
| # Doing 'print &ref' should show us e.g. '(S *) 0xdeadbeef <s1>'. |
| gdb_test "print &ref" " = \\(S \\*\\) ${address} <s1>" |
| |
| # gdb assumes C++ references are implemented as pointers, and |
| # print &(&ref) shows us the underlying pointer's address. |
| # Since in this case there's no physical pointer, gdb should tell us so. |
| gdb_test "print &(&ref)" "Attempt to take address of value not located in memory." |
| } |
| |
| # Test assignment through the synthetic reference. |
| gdb_test_no_output "set (ref = s2)" |
| |
| foreach_with_prefix print-object {"off" "on"} { |
| gdb_test_no_output "set print object ${print-object}" |
| |
| gdb_test "print ref" " = \\(S &\\) @${address}: \\{${s2_members}\\}" "print ref after assignment" |
| gdb_test "print s1" " = \\{${s2_members}\\}" "print s1 after assignment" |
| } |