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# Copyright 2022-2024 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/>.
# This testcase checks that if a function has the DW_AT_calling_convention
# attribute with the value DW_CC_nocall, then GDB will not:
# - call the function,
# - try to access the value returned by the function when using the finish
# command,
# - force a user-provided return value when using the return command.
#
# In every case, GDB prints a message to the user indicating the issue. For
# the return command, GDB asks the user to confirm if the specified value
# should be forced.
load_lib dwarf.exp
# This test can only be run on targets which support DWARF-2 and use gas.
require dwarf2_support
standard_testfile .c .S
# First compile the .c file so we can ask GDB what is sizeof(int).
if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile}] } {
untested "failed to compile"
return -1
}
# Make some DWARF for the test.
set asm_file [standard_output_file $srcfile2]
Dwarf::assemble $asm_file {
cu {} {
compile_unit {
{language @DW_LANG_C}
{name "calling-convention"}
} {
declare_labels int_label
int_label: base_type {
{byte_size [get_sizeof "int" 4] sdata}
{encoding @DW_ATE_signed}
{name "int"}
}
subprogram {
{MACRO_AT_func { foo }}
{type :$int_label}
{calling_convention @DW_CC_nocall}
}
subprogram {
{MACRO_AT_func { main }}
{type :$int_label}
}
}
}
}
if { [prepare_for_testing "failed to prepare" ${testfile} \
[list $srcfile $asm_file] {nodebug}] } {
return -1
}
if {![runto_main]} {
return -1
}
gdb_test "call foo ()" \
"Cannot call the function 'foo' which does not follow the target calling convention."
gdb_breakpoint "foo"
gdb_continue_to_breakpoint "foo"
gdb_test "return 35" \
"Not confirmed" \
"return 35" \
[multi_line \
"Function 'foo' does not follow the target calling convention\\." \
"If you continue, setting the return value will probably lead to unpredictable behaviors\\." \
"Make foo return now\\? \\(y or n\\) $"] \
"n"
gdb_test "finish" [multi_line \
"Run till exit from #0 $hex in foo \\(\\)" \
"warning: Function 'foo' does not follow the target calling convention, cannot determine its returned value\." \
"$hex in main \\(\\)" \
"Value returned has type: int. Cannot determine contents"]
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