186 lines
5.8 KiB
Plaintext
186 lines
5.8 KiB
Plaintext
# Copyright 2016-2017 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 a C++ reference marked with DW_OP_GNU_implicit_pointer.
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# The referenced value is a global struct whose location is a DW_OP_addr.
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if [skip_cplus_tests] {
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continue
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}
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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 implref-struct.S.
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standard_testfile .c .S
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# ${testfile} is now "implref-struct". srcfile2 is "implref-struct.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 implref-struct program.
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# Any program would do, but since we already have implref-struct
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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} {debug c++}] {
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return -1
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}
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# Create the DWARF. We need a regular variable for the struct and a reference
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# to it that'll be marked with DW_OP_GNU_implicit_pointer. The variable must be
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# global so that its name is an exported symbol that can we can reference from
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# the DWARF using gdb_target_symbol.
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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 struct_label variable_label ref_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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set S_size [get_sizeof "S" -1]
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# The compiler shouldn't introduce structure padding here.
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set b_offset 4
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set c_offset 8
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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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struct_label: DW_TAG_structure_type {
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{DW_AT_name "S"}
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{DW_AT_byte_size ${S_size} DW_FORM_udata}
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} {
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DW_TAG_member {
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{DW_AT_name "a"}
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{DW_AT_type :${int_label}}
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{DW_AT_data_member_location 0 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 ${b_offset} DW_FORM_udata}
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}
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DW_TAG_member {
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{DW_AT_name "c"}
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{DW_AT_type :${int_label}}
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{DW_AT_data_member_location ${c_offset} DW_FORM_udata}
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}
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}
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ref_label: DW_TAG_reference_type {
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{DW_AT_byte_size ${addr_size} DW_FORM_udata}
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{DW_AT_type :${struct_label}}
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}
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variable_label: DW_TAG_variable {
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{DW_AT_name "s1"}
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{DW_AT_type :${struct_label}}
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{DW_AT_external 1 DW_FORM_flag}
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{DW_AT_location {DW_OP_addr [gdb_target_symbol "s1"]} SPECIAL_expr}
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}
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DW_TAG_variable {
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{DW_AT_name "s2"}
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{DW_AT_type :${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 "s2"]} 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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DW_TAG_variable {
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{DW_AT_name "ref"}
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{DW_AT_type :${ref_label}}
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{DW_AT_location {DW_OP_GNU_implicit_pointer ${variable_label} 0} 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_implicit_pointer 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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# Returns the struct members, e.g. '{a = 0, b = 1, c = 2}'.
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proc get_members {var} {
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set members [get_valueof "" ${var} ""]
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# Trim leading/trailing whitespace, '{' and '}' since they confuse TCL to no end.
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set members [string trim ${members}]
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set members [string trim ${members} "{}"]
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return ${members}
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}
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# Values of the struct members.
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set s1_members [get_members "s1"]
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set s2_members [get_members "s2"]
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# Address of the referenced value.
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set address [get_hexadecimal_valueof "&s1" ""]
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# Test printing with both 'set print object off' and 'on', just to make sure
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# the output doesn't change.
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foreach_with_prefix print-object {"off" "on"} {
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gdb_test_no_output "set print object ${print-object}"
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# Doing 'print ref' should show us e.g.
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# '(S &) @0xdeadbeef: {a = 0, b = 1, c = 2}'.
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gdb_test "print ref" " = \\(S &\\) @${address}: \\{${s1_members}\\}"
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# Doing 'print &ref' should show us e.g. '(S *) 0xdeadbeef <s1>'.
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gdb_test "print &ref" " = \\(S \\*\\) ${address} <s1>"
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# gdb assumes C++ references are implemented as pointers, and
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# print &(&ref) shows us the underlying pointer's address.
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# Since in this case there's no physical pointer, gdb should tell us so.
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gdb_test "print &(&ref)" "Attempt to take address of value not located in memory."
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}
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# Test assignment through the synthetic reference.
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gdb_test_no_output "set (ref = s2)"
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foreach_with_prefix print-object {"off" "on"} {
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gdb_test_no_output "set print object ${print-object}"
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gdb_test "print ref" " = \\(S &\\) @${address}: \\{${s2_members}\\}" "print ref after assignment"
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gdb_test "print s1" " = \\{${s2_members}\\}" "print s1 after assignment"
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}
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