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Diffstat (limited to 'gdb/testsuite/gdb.dwarf2/implref-const.exp')
| -rw-r--r-- | gdb/testsuite/gdb.dwarf2/implref-const.exp | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/gdb/testsuite/gdb.dwarf2/implref-const.exp b/gdb/testsuite/gdb.dwarf2/implref-const.exp new file mode 100644 index 0000000..9b6d5fe --- /dev/null +++ b/gdb/testsuite/gdb.dwarf2/implref-const.exp @@ -0,0 +1,119 @@ +# 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 DW_AT_const_value. + +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-const.S. +standard_testfile main.c .S + +# ${testfile} is now "implref-const". srcfile2 is "implref-const.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-const program. +# Any program would do, but since we already have implref-const +# specifically for this testcase, might as well use that. +if [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile}] { + untested ${testfile}.exp + return -1 +} + +# Create the DWARF. We need a regular variable and a reference to it that'll +# be marked with DW_OP_GNU_implicit_pointer. +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 const_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 var_value 42 + + 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"} + } + + ref_label: DW_TAG_reference_type { + {DW_AT_byte_size ${addr_size} DW_FORM_udata} + {DW_AT_type :${int_label}} + } + + const_label: DW_TAG_const_type { + {DW_AT_type :${ref_label}} + } + + DW_TAG_subprogram { + {MACRO_AT_func { "main" "${srcdir}/${subdir}/${srcfile}" }} + {DW_AT_type :${int_label}} + {DW_AT_external 1 DW_FORM_flag} + } { + variable_label: DW_TAG_variable { + {DW_AT_name "var"} + {DW_AT_type :${int_label}} + {DW_AT_const_value ${var_value} DW_FORM_udata} + } + + DW_TAG_variable { + {DW_AT_name "ref"} + {DW_AT_type :${const_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 +} + +# Doing 'print ref' should show us e.g. '(int &) <synthetic pointer>: 42'. +gdb_test "print ref" " = \\(int &\\) <synthetic pointer>: \\\d+" + +# The variable isn't located in memory, thus we can't take its address. +gdb_test "print &var" "Can't take address of \"var\" which isn't an lvalue." +gdb_test "print &ref" "Attempt to take address of value not located in memory." + +# 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." |