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calling-convention.exp revision 1.1.1.1 
      1 # Copyright 2022-2023 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 if {![dwarf2_support]} {
     31     return 0
     32 }
     33 
     34 standard_testfile .c .S
     35 
     36 # First compile the .c file so we can ask GDB what is sizeof(int).
     37 if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile}] } {
     38     untested "failed to compile"
     39     return -1
     40 }
     41 
     42 # Make some DWARF for the test.
     43 set asm_file [standard_output_file $srcfile2]
     44 Dwarf::assemble $asm_file {
     45     cu {} {
     46 	compile_unit {
     47 	    {language @DW_LANG_C}
     48 	    {name "calling-convention"}
     49 	} {
     50 	    declare_labels int_label
     51 
     52 	    int_label: base_type {
     53 		{byte_size [get_sizeof "int" 4] sdata}
     54 		{encoding @DW_ATE_signed}
     55 		{name "int"}
     56 	    }
     57 
     58 	    subprogram {
     59 		{MACRO_AT_func { foo }}
     60 		{type :$int_label}
     61 		{calling_convention @DW_CC_nocall}
     62 	    }
     63 
     64 	    subprogram {
     65 		{MACRO_AT_func { main }}
     66 		{type :$int_label}
     67 	    }
     68 	}
     69     }
     70 }
     71 
     72 if { [prepare_for_testing "failed to prepare" ${testfile} \
     73 	  [list $srcfile $asm_file] {nodebug}] } {
     74     return -1
     75 }
     76 
     77 if {![runto_main]} {
     78     return -1
     79 }
     80 
     81 gdb_test "call foo ()" \
     82     "Cannot call the function 'foo' which does not follow the target calling convention."
     83 gdb_breakpoint "foo"
     84 gdb_continue_to_breakpoint "foo"
     85 
     86 gdb_test "return 35" \
     87        "Not confirmed" \
     88        "return 35" \
     89        [multi_line \
     90            "Function 'foo' does not follow the target calling convention\\." \
     91            "If you continue, setting the return value will probably lead to unpredictable behaviors\\." \
     92            "Make foo return now\\? \\(y or n\\) $"] \
     93        "n"
     94 
     95 gdb_test "finish" [multi_line \
     96     "Run till exit from #0  $hex in foo \\(\\)" \
     97     "warning: Function 'foo' does not follow the target calling convention, cannot determine its returned value\." \
     98     "$hex in main \\(\\)" \
     99     "Value returned has type: int. Cannot determine contents"]
    100