gdb/testsuite/gdb.mi/mi-frame-regs.exp

   1 # Copyright 2018-2021 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 essential Machine interface (MI) operations
  17 #
  18 # Verify that -var-update will provide the correct values for floating
  19 # and fixed varobjs that represent the pc register.
  20 #
  21
  22 load_lib mi-support.exp
  23 set MIFLAGS "-i=mi"
  24
  25 standard_testfile basics.c
  26
  27 if {[gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" \
  28                  executable {debug}] != "" } then {
  29      untested mi-frame-regs.exp
  30      return -1
  31 }
  32
  33 # Return the address of the specified breakpoint.
  34
  35 proc breakpoint_address {bpnum} {
  36     global hex
  37     global expect_out
  38     global mi_gdb_prompt
  39
  40     send_gdb "info breakpoint $bpnum\n"
  41     gdb_expect {
  42         -re ".*($hex).*$mi_gdb_prompt$" {
  43             return $expect_out(1,string)
  44         }
  45         -re ".*$mi_gdb_prompt$" {
  46             unresolved "get address of breakpoint $bpnum"
  47             return ""
  48         }
  49         timeout {
  50             unresolved "get address of breakpoint $bpnum (timeout)"
  51             return ""
  52         }
  53     }
  54 }
  55
  56 # Test that a floating varobj representing $pc will provide the
  57 # correct value via -var-update as the program stops at
  58 # breakpoints in different functions.
  59
  60 proc_with_prefix do_floating_varobj_test {} {
  61     global srcfile binfile
  62     global hex
  63     global expect_out
  64
  65     if {[mi_clean_restart $binfile]} {
  66         fail "couldn't start gdb"
  67         return
  68     }
  69
  70     mi_runto_main
  71
  72     # Create a floating varobj for $pc.
  73     mi_gdb_test "-var-create --thread 1 --frame 0 - @ \$pc" \
  74         "\\^done,.*value=\"$hex.*" \
  75         "create varobj for pc in frame 0"
  76
  77     set nframes 4
  78     for {set i 1} {$i < $nframes} {incr i} {
  79
  80         # Run to a breakpoint in each callee function in succession.
  81         # Note that we can't use mi_runto because we need the
  82         # breakpoint to be persistent, so we can use its address.
  83         set bpnum [expr $i + 1]
  84         mi_create_breakpoint \
  85             "basics.c:callee$i" \
  86             "insert breakpoint at basics.c:callee$i" \
  87             -number $bpnum -func callee$i -file ".*basics.c"
  88
  89         mi_execute_to "exec-continue" "breakpoint-hit" \
  90             "callee$i" ".*" ".*${srcfile}" ".*" \
  91             { "" "disp=\"keep\"" } "breakpoint hit in callee$i"
  92
  93         # Get the value of $pc from the floating varobj.
  94         mi_gdb_test "-var-update 1 var1" \
  95             "\\^done,.*value=\"($hex) .*" \
  96             "-var-update for frame $i"
  97         set pcval $expect_out(3,string)
  98
  99         # Get the address of the current breakpoint.
 100         set bpaddr [breakpoint_address $bpnum]
 101         if {$bpaddr == ""} then { return }
 102
 103         # Check that the addresses are the same.
 104         gdb_assert [expr $bpaddr == $pcval] "\$pc equals address of breakpoint in callee$i"
 105     }
 106 }
 107
 108 # Test that fixed varobjs representing $pc in different stack frames
 109 # will provide the correct value via -var-update after the program
 110 # counter changes (without substantially changing the stack).
 111
 112 proc_with_prefix do_fixed_varobj_test {} {
 113     global srcfile binfile
 114     global hex
 115
 116     if {[mi_clean_restart $binfile] != 0} {
 117         fail "couldn't start gdb"
 118         return
 119     }
 120
 121     mi_runto_main
 122
 123     # Run to the function 'callee3' so we have several frames.
 124     mi_create_breakpoint "basics.c:callee3" \
 125         "insert breakpoint at basics.c:callee3" \
 126         -number 2 -func callee3 -file ".*basics.c"
 127
 128     mi_execute_to "exec-continue" "breakpoint-hit" \
 129         "callee3" ".*" ".*${srcfile}" ".*" \
 130         { "" "disp=\"keep\"" } "breakpoint hit in callee3"
 131
 132     # At the breakpoint in callee3 there are 4 frames.
 133     #
 134     # Create some varobj based on $pc in all frames.  When we single
 135     # step we expect the varobj for frame 0 to change, while the
 136     # varobj for all other frames should be unchanged.
 137     #
 138     # Track in FIRST_UNCHANGING_VARNUM the number of the first varobj
 139     # that is not in frame 0, varobj with a lower number we expect to
 140     # change, while this and later varobj should not change.
 141     #
 142     # Track the number of the next varobj to be created in VARNUM.
 143     set first_unchanging_varnum 0
 144     set varnum 1
 145
 146     for {set i 0} {$i < 4} {incr i} {
 147
 148         if { $i == 1 } then { set first_unchanging_varnum $varnum }
 149
 150         mi_gdb_test "-var-create --thread 1 --frame $i - \* \$pc" \
 151             "\\^done,.*value=\"$hex.*" \
 152             "create varobj for \$pc in frame $i"
 153         incr varnum
 154
 155         mi_gdb_test "-var-create --thread 1 --frame $i - \* \"global_zero + \$pc\"" \
 156             "\\^done,.*value=\"$hex.*" \
 157             "create varobj for 'global_zero + \$pc' in frame $i"
 158         incr varnum
 159     }
 160
 161     # Step one instruction to change the program counter.
 162     mi_execute_to "exec-next-instruction" "end-stepping-range" \
 163         "callee3" ".*" ".*${srcfile}" ".*" "" \
 164         "next instruction in callee3"
 165
 166     # Check that -var-update reports that the values are changed for
 167     # varobj in frame 0.
 168     for {set i 1} {$i < $first_unchanging_varnum} {incr i} {
 169         mi_gdb_test "-var-update 1 var$i" \
 170             "\\^done,(changelist=\\\[\{name=\"var$i\"\[^\\\]\]+\\\])" \
 171             "varobj var$i has changed"
 172     }
 173
 174     # Check that -var-update reports that the values are unchanged for
 175     # varobj in frames other than 0.
 176     for {set i $first_unchanging_varnum} {$i < $varnum} {incr i} {
 177         mi_gdb_test "-var-update 1 var$i" \
 178             "\\^done,(changelist=\\\[\\\])" \
 179             "varobj var$i has not changed"
 180     }
 181 }
 182
 183 do_fixed_varobj_test
 184 do_floating_varobj_test