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      1 # Copyright 2022-2024 Free Software Foundation, Inc.
      2 
      3 # This program is free software; you can redistribute it and/or modify
      4 # it under the terms of the GNU General Public License as published by
      5 # the Free Software Foundation; either version 3 of the License, or
      6 # (at your option) any later version.
      7 #
      8 # This program is distributed in the hope that it will be useful,
      9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
     10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     11 # GNU General Public License for more details.
     12 #
     13 # You should have received a copy of the GNU General Public License
     14 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
     15 
     16 # This testcase checks that if a function has the DW_AT_calling_convention
     17 # attribute with the value DW_CC_nocall, then GDB will not:
     18 # - call the function,
     19 # - try to access the value returned by the function when using the finish
     20 #   command,
     21 # - force a user-provided return value when using the return command.
     22 #
     23 # In every case, GDB prints a message to the user indicating the issue.  For
     24 # the return command, GDB asks the user to confirm if the specified value
     25 # should be forced.
     26 
     27 load_lib dwarf.exp
     28 
     29 # This test can only be run on targets which support DWARF-2 and use gas.
     30 require dwarf2_support
     31 
     32 standard_testfile .c .S
     33 
     34 # First compile the .c file so we can ask GDB what is sizeof(int).
     35 if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile}] } {
     36     untested "failed to compile"
     37     return -1
     38 }
     39 
     40 # Make some DWARF for the test.
     41 set asm_file [standard_output_file $srcfile2]
     42 Dwarf::assemble $asm_file {
     43     cu {} {
     44 	compile_unit {
     45 	    {language @DW_LANG_C}
     46 	    {name "calling-convention"}
     47 	} {
     48 	    declare_labels int_label
     49 
     50 	    int_label: base_type {
     51 		{byte_size [get_sizeof "int" 4] sdata}
     52 		{encoding @DW_ATE_signed}
     53 		{name "int"}
     54 	    }
     55 
     56 	    subprogram {
     57 		{MACRO_AT_func { foo }}
     58 		{type :$int_label}
     59 		{calling_convention @DW_CC_nocall}
     60 	    }
     61 
     62 	    subprogram {
     63 		{MACRO_AT_func { main }}
     64 		{type :$int_label}
     65 	    }
     66 	}
     67     }
     68 }
     69 
     70 if { [prepare_for_testing "failed to prepare" ${testfile} \
     71 	  [list $srcfile $asm_file] {nodebug}] } {
     72     return -1
     73 }
     74 
     75 if {![runto_main]} {
     76     return -1
     77 }
     78 
     79 gdb_test "call foo ()" \
     80     "Cannot call the function 'foo' which does not follow the target calling convention."
     81 gdb_breakpoint "foo"
     82 gdb_continue_to_breakpoint "foo"
     83 
     84 gdb_test "return 35" \
     85        "Not confirmed" \
     86        "return 35" \
     87        [multi_line \
     88            "Function 'foo' does not follow the target calling convention\\." \
     89            "If you continue, setting the return value will probably lead to unpredictable behaviors\\." \
     90            "Make foo return now\\? \\(y or n\\) $"] \
     91        "n"
     92 
     93 gdb_test "finish" [multi_line \
     94     "Run till exit from #0  $hex in foo \\(\\)" \
     95     "warning: Function 'foo' does not follow the target calling convention, cannot determine its returned value\." \
     96     "$hex in main \\(\\)" \
     97     "Value returned has type: int. Cannot determine contents"]
     98