gdb/testsuite/gdb.dwarf2/symbol_needs_eval_timeout.exp

   1 # Copyright 2017-2023 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 # Test the symbol needs check mechanism if it assumes that faking
  17 # reads from a target is a safe thing to do.
  18 #
  19 # In particular, the test uses a relative branch DWARF operation to
  20 # potentially cause an infinite loop, if the target reads are indeed
  21 # faked.
  22
  23 load_lib dwarf.exp
  24
  25 # This test can only be run on targets which support DWARF-2 and use gas.
  26 if {![dwarf2_support]} {
  27     return 0
  28 }
  29
  30 # Choose suitable integer registers for the test.
  31
  32 set dwarf_regnum 0
  33
  34 if { [is_aarch64_target] } {
  35     set regname x0
  36 } elseif { [is_aarch32_target]
  37            || [istarget "s390*-*-*" ]
  38            || [istarget "powerpc*-*-*"]
  39            || [istarget "rs6000*-*-aix*"] } {
  40     set regname r0
  41 } elseif { [is_x86_like_target] } {
  42     set regname eax
  43 } elseif { [is_amd64_regs_target] } {
  44     set regname rax
  45 } else {
  46     verbose "Skipping ${gdb_test_file_name}."
  47     return
  48 }
  49
  50 standard_testfile symbol_needs_eval.c ${gdb_test_file_name}-dw.S
  51
  52 # Make some DWARF for the test.
  53
  54 set asm_file [standard_output_file $srcfile2]
  55 Dwarf::assemble $asm_file {
  56     global dwarf_regnum regname
  57
  58     set exec_mask_var [gdb_target_symbol exec_mask]
  59
  60     cu {} {
  61         DW_TAG_compile_unit {
  62             {DW_AT_name symbol_needs_eval.c}
  63             {DW_AT_comp_dir /tmp}
  64         } {
  65             declare_labels int_type_label
  66
  67             # define int type
  68             int_type_label: DW_TAG_base_type {
  69                 {DW_AT_name "int"}
  70                 {DW_AT_encoding @DW_ATE_signed}
  71                 {DW_AT_byte_size 4 DW_FORM_sdata}
  72             }
  73
  74             # add info for variable exec_mask
  75             DW_TAG_variable {
  76                 {DW_AT_name exec_mask}
  77                 {DW_AT_type :$int_type_label}
  78                 {DW_AT_location {
  79                     DW_OP_addr $exec_mask_var
  80                 } SPECIAL_expr}
  81                 {external 1 flag}
  82             }
  83
  84             # add info for subprogram main
  85             DW_TAG_subprogram {
  86                 {MACRO_AT_func { main }}
  87                 {DW_AT_frame_base {
  88                     DW_OP_regx $dwarf_regnum
  89                 } SPECIAL_expr}
  90             } {
  91                 # define artificial variable a
  92                 DW_TAG_variable {
  93                     {DW_AT_name a}
  94                     {DW_AT_type :$int_type_label}
  95                     {DW_AT_location {
  96                         DW_OP_lit1
  97                         DW_OP_addr $exec_mask_var
  98                         DW_OP_deref
  99
 100                         # jump to DW_OP_fbreg
 101                         DW_OP_skip 4
 102                         DW_OP_drop
 103                         DW_OP_fbreg 0
 104                         DW_OP_dup
 105                         DW_OP_lit0
 106                         DW_OP_eq
 107
 108                         # conditional jump to DW_OP_drop
 109                         DW_OP_bra -9
 110                         DW_OP_stack_value
 111                     } SPECIAL_expr}
 112                     {external 1 flag}
 113                 }
 114             }
 115         }
 116     }
 117 }
 118
 119 if { [prepare_for_testing ${testfile}.exp ${testfile} \
 120           [list $srcfile $asm_file] {nodebug}] } {
 121     return -1
 122 }
 123
 124 if ![runto_main] {
 125     return -1
 126 }
 127
 128 gdb_test_no_output "set var \$$regname = 2" "init reg to 2"
 129 gdb_test_no_output "set var exec_mask = 0" "init exec_mask to 0"
 130
 131 gdb_test "print/d a" " = 2" "a == 2"