gdb/testsuite/gdb.dwarf2/void-type.exp

   1 # Copyright 2018-2019 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 tests some non-standard DWARF spotted in an Intel C Compiler
  17 # generated binary.
  18 #
  19 # The DWARF standard (V5 3.3.2) says that a void C function should not
  20 # have a DW_AT_type attribute, however, an ICC compiled binary was
  21 # found to have a DW_AT_type that referenced a signed integer type, of
  22 # size 0, with the name 'void'.
  23 #
  24 # This 'void' integer type would cause GDB to crash in some cases, one
  25 # that was seen was when using 'finish' to leave the void function.
  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 void-type.c void-type.S
  35
  36 # Make some DWARF for the test.
  37 set asm_file [standard_output_file $srcfile2]
  38 Dwarf::assemble $asm_file {
  39     global srcdir subdir srcfile
  40
  41     set func_result [function_range func ${srcdir}/${subdir}/${srcfile}]
  42     set func_start [lindex $func_result 0]
  43     set func_length [lindex $func_result 1]
  44
  45     set main_result [function_range main ${srcdir}/${subdir}/${srcfile}]
  46     set main_start [lindex $main_result 0]
  47     set main_length [lindex $main_result 1]
  48
  49     cu {} {
  50         DW_TAG_compile_unit {
  51                 {DW_AT_producer "Intel(R) C Intel(R) 64 Compiler XE for applications running on Intel(R) 64, Version 14.0.5.212 Build 20150212"}
  52                 {DW_AT_language @DW_LANG_C}
  53                 {DW_AT_name     void-type.c}
  54                 {DW_AT_comp_dir /tmp}
  55         } {
  56             declare_labels int_type void_type ptr_type
  57
  58             int_type: DW_TAG_base_type {
  59                 {DW_AT_byte_size 4 DW_FORM_sdata}
  60                 {DW_AT_encoding  @DW_ATE_signed}
  61                 {DW_AT_name      int}
  62             }
  63
  64             void_type: DW_TAG_base_type {
  65                 {DW_AT_byte_size 0 DW_FORM_sdata}
  66                 {DW_AT_encoding  @DW_ATE_signed}
  67                 {DW_AT_name      void}
  68             }
  69
  70             ptr_type: DW_TAG_pointer_type {
  71                 {DW_AT_type :$void_type}
  72             }
  73
  74             DW_TAG_subprogram {
  75                 {name func}
  76                 {low_pc $func_start addr}
  77                 {high_pc "$func_start + $func_length" addr}
  78                 {type :$void_type}
  79             }
  80             DW_TAG_subprogram {
  81                 {name main}
  82                 {low_pc $main_start addr}
  83                 {high_pc "$main_start + $main_length" addr}
  84                 {type :$int_type}
  85             }
  86
  87             DW_TAG_variable {
  88                 {DW_AT_name "var_a"}
  89                 {DW_AT_type :$int_type}
  90                 {DW_AT_external 1 DW_FORM_flag}
  91                 {DW_AT_location {DW_OP_addr [gdb_target_symbol "var_a"]} SPECIAL_expr}
  92             }
  93
  94             DW_TAG_variable {
  95                 {DW_AT_name "var_ptr"}
  96                 {DW_AT_type :$ptr_type}
  97                 {DW_AT_external 1 DW_FORM_flag}
  98                 {DW_AT_location {DW_OP_addr [gdb_target_symbol "var_ptr"]} SPECIAL_expr}
  99             }
 100         }
 101     }
 102 }
 103
 104 if { [prepare_for_testing "failed to prepare" ${testfile} \
 105           [list $srcfile $asm_file] {nodebug}] } {
 106     return -1
 107 }
 108
 109 if ![runto_main] {
 110     return -1
 111 }
 112
 113 # Place a breakpoint in 'func' and continue to there.
 114 gdb_breakpoint func
 115 gdb_continue_to_breakpoint "func"
 116
 117 # Check how GDB handles the void* variable.
 118 gdb_test "p *var_ptr" "Attempt to dereference a generic pointer." \
 119     "check that dereferencing a void* gives a suitable message"
 120
 121 # Now finish, returning to main.
 122 gdb_test "finish" [multi_line \
 123                        "Run till exit from #0  $hex in func \\\(\\\)" \
 124                        "$hex in main \\\(\\\)"] \
 125     "check that finish completes"