61baf725ec
This applies the second part of GDB's End of Year Procedure, which
updates the copyright year range in all of GDB's files.
gdb/ChangeLog:
Update copyright year range in all GDB files.
125 lines
4.1 KiB
Plaintext
125 lines
4.1 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 variable 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-global.S.
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standard_testfile .c .S
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# ${testfile} is now "implref-global". srcfile2 is "implref-global.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-global program.
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# Any program would do, but since we already have implref-global
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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. We need a regular variable and a reference to it that'll
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# be marked with DW_OP_GNU_implicit_pointer. The variable must be global so
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# that its name is an exported symbol that we can reference from the DWARF
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# 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 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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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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ref_label: DW_TAG_reference_type {
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{DW_AT_byte_size ${addr_size} DW_FORM_udata}
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{DW_AT_type :${int_label}}
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}
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variable_label: DW_TAG_variable {
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{DW_AT_name "global_var"}
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{DW_AT_type :${int_label}}
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{DW_AT_external 1 DW_FORM_flag}
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{DW_AT_location {DW_OP_addr [gdb_target_symbol "global_var"]} SPECIAL_expr}
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}
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DW_TAG_subprogram {
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{MACRO_AT_func { "main" "${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} ${srcfile}] {}] {
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return -1
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}
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# DW_OP_GNU_implicit_pointer implementation requires a valid frame.
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if ![runto_main] {
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return -1
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}
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# Address of the referenced value.
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set address [get_hexadecimal_valueof "&global_var" ""]
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# Doing 'print ref' should show us e.g. '(int &) @0xdeadbeef: 42'.
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gdb_test "print ref" " = \\(int &\\) @${address}: \\\d+"
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# Doing 'print &ref' should show us e.g. '(int *) 0xdeadbeef <global_var>'.
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gdb_test "print &ref" " = \\(int \\*\\) ${address} <global_var>"
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# gdb assumes C++ references are implemented as pointers, and print &(&ref)
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# shows us the underlying pointer's address. Since in this case there's no
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# 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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# Test assignment through the synthetic reference.
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set new_value 10
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gdb_test_no_output "set (ref = ${new_value})"
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gdb_test "print ref" " = \\(int &\\) @${address}: ${new_value}" "print ref after assignment"
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gdb_test "print global_var" " = ${new_value}" "print global_var after assignment"
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