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# Copyright 2002-2022 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/>. */
# code_elim.exp -- tests that GDB can handle executables where some data/code
# has been eliminated by the linker.
set testfile1 code_elim1
set testfile2 code_elim2
set srcfile1 ${testfile1}.c
set srcfile2 ${testfile2}.c
set binfile1 [standard_output_file ${testfile1}]
set binfile2 [standard_output_file ${testfile2}]
set opts [list debug]
lappend opts "additional_flags=-ffunction-sections"
lappend opts "additional_flags=-fdata-sections"
lappend opts "ldflags=-Wl,-gc-sections"
lappend opts "ldflags=-Wl,-e,main"
# Place variables in .data instead of .sdata.
if {[istarget "riscv*-*-*"]} {
lappend opts "additional_flags=-msmall-data-limit=0"
}
remote_exec build "rm -f ${binfile1}"
remote_exec build "rm -f ${binfile2}"
if { [gdb_compile "${srcdir}/${subdir}/${srcfile1}" "${binfile1}" executable $opts] != "" } {
untested "failed to compile"
return -1
}
if { [gdb_compile "${srcdir}/${subdir}/${srcfile2}" "${binfile2}" executable $opts] != "" } {
untested "failed to compile"
return -1
}
proc not_null_var_address { var } {
# Same as get_var_address, expect that it reports a failure if a null
# address is returned by gdb.
set address [get_var_address $var]
regexp "0x\[0-9a-fA-F\]+" $address address
if { "$address" == "0x0" } {
fail "$var has null address"
}
}
proc test_eliminated_var { var } {
global gdb_prompt hex
# Match output 'No symbol "${var}" in current context'
gdb_test_multiple "print &${var}" "test eliminated var ${var}" {
-re "No symbol \"${var}\" in current context\\.\[\r\n\]+${gdb_prompt} $" {
pass "test eliminated var ${var}"
}
-re "\\\$\[0-9\]+ = \\(.*\\) (0|$hex)( <${var}>)?\[\r\n\]+${gdb_prompt} $" {
fail "test eliminated var ${var}"
}
}
}
# Check that the code and data eliminated in binfile1 are not included
# into partial symtab... and that non-eliminated symbols are still there.
gdb_exit
gdb_start
gdb_test "symbol-file ${binfile1}" \
"Reading symbols from .*${testfile1}\\.\\.\\.(|\r\nUsing host libthread_db library .*libthread_db.so.*\\.)" \
"symbol-file ${testfile1}"
with_test_prefix "single psymtabs" {
test_eliminated_var my_global_symbol
test_eliminated_var my_static_symbol
test_eliminated_var my_global_func
not_null_var_address main
}
# Same thing for symtabs
gdb_exit
global GDBFLAGS
set saved_gdbflags $GDBFLAGS
set GDBFLAGS "$GDBFLAGS --readnow $binfile1"
gdb_start
set GDBFLAGS $saved_gdbflags
with_test_prefix "single symtabs" {
test_eliminated_var my_global_symbol
test_eliminated_var my_static_symbol
test_eliminated_var my_global_func
not_null_var_address main
}
# binfile2 contains the symbols that have been eliminated in binfile1. Check
# the eliminated symbols does not hide these valid ones.
gdb_exit
gdb_start
with_test_prefix "order1" {
gdb_test "add-symbol-file ${binfile1} 0x100000 -s .bss 0x120000" \
"Reading symbols from .*${testfile1}\\.\\.\\." \
"add-symbol-file ${testfile1} 0x100000" \
"add symbol table from file \".*${testfile1}\" at.*\\(y or n\\) " \
"y"
gdb_test "add-symbol-file ${binfile2} 0x200000 -s .data 0x210000 -s .bss 0x220000" \
"Reading symbols from .*${testfile2}\\.\\.\\." \
"add-symbol-file ${testfile2} 0x200000" \
"add symbol table from file \".*${testfile2}\" at.*\\(y or n\\) " \
"y"
not_null_var_address my_global_symbol
not_null_var_address my_static_symbol
not_null_var_address my_global_func
not_null_var_address main
}
# Same thing, but loading binfile2 before binfile1.
gdb_exit
gdb_start
with_test_prefix "order2" {
gdb_test "add-symbol-file ${binfile2} 0x200000 -s .data 0x210000 -s .bss 0x220000" \
"Reading symbols from .*${testfile2}\\.\\.\\." \
"add-symbol-file ${testfile2} 0x200000" \
"add symbol table from file \".*${testfile2}\" at.*\\(y or n\\) " \
"y"
gdb_test "add-symbol-file ${binfile1} 0x100000 -s .bss 0x120000" \
"Reading symbols from .*${testfile1}\\.\\.\\." \
"add-symbol-file ${testfile1} 0x100000" \
"add symbol table from file \".*${testfile1}\" at.*\\(y or n\\) " \
"y"
not_null_var_address my_global_symbol
not_null_var_address my_static_symbol
not_null_var_address my_global_func
not_null_var_address main
}
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