ld/testsuite/ld-undefined/undefined.exp

   1 # Test that the linker reports undefined symbol errors correctly.
   2 # By Ian Lance Taylor, Cygnus Support
   3 #
   4 #   Copyright (C) 1995-2018 Free Software Foundation, Inc.
   5 #
   6 # This file is part of the GNU Binutils.
   7 #
   8 # This program is free software; you can redistribute it and/or modify
   9 # it under the terms of the GNU General Public License as published by
  10 # the Free Software Foundation; either version 3 of the License, or
  11 # (at your option) any later version.
  12 #
  13 # This program is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU General Public License for more details.
  17 #
  18 # You should have received a copy of the GNU General Public License
  19 # along with this program; if not, write to the Free Software
  20 # Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  21 # MA 02110-1301, USA.
  22
  23 set testund "undefined"
  24 set testfn "undefined function"
  25 set testline "undefined line"
  26
  27 if { ![is_remote host] && [which $CC] == 0 } {
  28     verbose "Could not find C compiler!" 1
  29     untested $testund
  30     untested $testfn
  31     untested $testline
  32 } elseif { ![ld_compile "$CC -g" $srcdir/$subdir/undefined.c tmpdir/undefined.o] } {
  33     verbose "Unable to compile test file!" 1
  34     unresolved $testund
  35     unresolved $testfn
  36     unresolved $testline
  37 } else {
  38     remote_file host delete "tmpdir/undefined"
  39
  40     set flags [big_or_little_endian]
  41
  42     # Using -e start prevents the SunOS linker from trying to build a
  43     # shared library.
  44     send_log "$ld -e start $flags -o tmpdir/undefined tmpdir/undefined.o\n"
  45     set exec_output [run_host_cmd "$ld" "-e start $flags -o tmpdir/undefined tmpdir/undefined.o"]
  46
  47     send_log "$exec_output\n"
  48     verbose "$exec_output"
  49
  50     proc checkund { string testname } {
  51         global exec_output
  52
  53         if [string match "*$string*" $exec_output] {
  54             pass $testname
  55         } else {
  56             fail $testname
  57         }
  58     }
  59
  60     set mu "undefined reference to `*this_function_is_not_defined'"
  61     checkund $mu $testund
  62
  63     # ARM PE defaults to using stabs debugging, which we can't handle
  64     # for a COFF file.
  65     #setup_xfail "arm*-*-pe*"
  66
  67     # For Xtensa on GNU Linux systems (or any other system where PIC
  68     # code is always used), the address of the undefined function is
  69     # in a literal pool outside the function, so that both the
  70     # "undefined function" and "undefined line" tests fail.
  71     setup_xfail xtensa*-*-linux*
  72
  73     set mf "tmpdir/undefined.o* in function `function':"
  74     checkund $mf $testfn
  75
  76     if ![is_elf_format] {
  77         # COFF SH gets this test wrong--it reports line 10, because
  78         # although the jump is at line 9, the function address, and
  79         # the reloc, is stored at the end of the function.
  80         setup_xfail "sh-*-*"
  81
  82         # ARM PE defaults to using stabs debugging, which we can't
  83         # handle for a COFF file.
  84         #setup_xfail "arm*-*-pe*"
  85     }
  86
  87     set ml "undefined.c:9: undefined reference to `*this_function_is_not_defined'"
  88     # With targets that use elf/dwarf2, such as the arm-elf toolchain,
  89     # the code in bfd/elf.c:_bfd_elf_find_nearest_line() is called in
  90     # order to locate the file name/line number where the undefined
  91     # reference occurs.  Unfortunately this tries to use the dwarf2
  92     # debug information held in the .debug_info section.  This section
  93     # contains a series of comp_unit structures, each of which has a
  94     # low/high address range representing the span of memory locations
  95     # covered by that structure.  The structures also index into other
  96     # structures held in the .debug_line section and together they can
  97     # translate memory locations back into file/function/line number
  98     # addresses in the source code.  Since the information about the
  99     # memory region covered by a comp_unit is only determined at link
 100     # time, the low/high  addresses in the .debug_info section and the
 101     # line addresses in the .debug_line section are computed by
 102     # generating relocs against known symbols in the object code.
 103     #
 104     # When the undefined reference is detected, the relocs in the
 105     # dwarf2 debug sections have not yet been resolved, so the
 106     # low/high addresses and the line number address are all set at
 107     # zero.  Thus when _bfd_elf_find_nearest_line() calls
 108     # _bfd_dwarf2_find_nearest_line() no comp_unit can be found which
 109     # actually covers the address where the reference occurred, and so
 110     # _bfd_elf_find_nearest_line() fails.
 111     #
 112     # The upshot of all of this, is that the error message reported by
 113     # the linker, instead of having a source file name & line number
 114     # as in:
 115     #
 116     #   undefined.c:9: undefined reference to `this_function_is_not_defined'
 117     #
 118     # has an object file & section address instead:
 119     #
 120     #   undefined.0(.text+0xc): undefined reference to `this_function_is_not_defined'
 121     #
 122     # hence the xfails below.
 123
 124     setup_xfail mcore-*-elf
 125     setup_xfail mep-*-*
 126     setup_xfail mips-sgi-irix6*
 127     # Fails for the MSP430 because it uses SYM_DIFF relocs but it does
 128     # not provide a special_function for handling them.  If
 129     # optimization is enabled then this test passes because
 130     # function()'s prologue is eliminated.
 131     setup_xfail "msp430-*-*"
 132
 133     # The undefined test fails on 31 bit s/390 because the address of
 134     # the function `this_function_is_not_defined' is stored in the
 135     # literal pool of the function.  Therefore the line number in the
 136     # error message is 8 instead of 9. On 64 bit s/390 this works
 137     # because of the new brasl instruction that doesn't need a literal
 138     # pool entry.
 139     setup_xfail s390-*-*
 140
 141     # See comments above for Xtensa.
 142     setup_xfail xtensa*-*-linux*
 143     setup_xfail hppa*64*-*-*
 144
 145     checkund $ml $testline
 146 }
 147
 148 # Undefined symbols should become dynamic when linking a shared lib.
 149 set testname "undefined symbols in shared lib"
 150
 151 set asflags ""
 152 switch -glob $target_triplet {
 153     aarch64* -
 154     arm* -
 155     powerpc64* { set asflags "--defsym BL=1" }
 156     powerpc* { set asflags "--defsym BLPLT=1" }
 157     hppa* { set asflags "--defsym HPPA=1" }
 158     i\[3-7\]86* -
 159     x86_64* { set asflags "--defsym CALLPLT=1" }
 160 }
 161
 162 if { ![is_elf_format] || ![check_shared_lib_support]} then {
 163     unsupported $testname
 164 } elseif {![ld_assemble $as "$asflags $srcdir/$subdir/fundef.s" \
 165                 tmpdir/fundef.o]} then {
 166     fail $testname
 167 } elseif {![ld_link $ld tmpdir/fundef.so \
 168                 "-shared --allow-shlib-undefined tmpdir/fundef.o"]} then {
 169     setup_xfail tic6x-*-*
 170     fail $testname
 171 } else {
 172     if {![is_remote host] && [which $nm] == 0} then {
 173         unresolved "$testname (dyn sym)"
 174     } else {
 175         set exec_output [run_host_cmd "$nm" "-D tmpdir/fundef.so"]
 176         set exec_output [prune_warnings $exec_output]
 177
 178         if { ($asflags == ""
 179               || ([regexp ".* undef_fun_typed.*" $exec_output]
 180                   && [regexp ".* undef_fun_notype.*" $exec_output]))
 181              && [regexp ".* undef_data.*" $exec_output]
 182              && [regexp ".* undef_pfun.*" $exec_output]
 183              && [regexp ".* undef_notype.*" $exec_output]} then {
 184             pass "$testname (dyn sym)"
 185         } else {
 186             fail "$testname (dyn sym)"
 187         }
 188     }
 189
 190     global READELF
 191     if {![is_remote host] && [which $READELF] == 0} then {
 192         unresolved "$testname (dyn reloc)"
 193     } else {
 194         set exec_output [run_host_cmd "$READELF" "-r tmpdir/fundef.so"]
 195         set exec_output [prune_warnings $exec_output]
 196
 197         # We ought to get two .rel{a}.plt and three .rel{a}.dyn relocs,
 198         # except for MIPS targets whose psABI mandates an extra
 199         # R_MIPS_NONE relocation, also used to pad n64 relocation
 200         # triplets, and S+core targets using an extra R_SCORE_NONE
 201         # relocation, so adjust for that.
 202         switch -glob $target_triplet {
 203             "mips64*-*-openbsd*" {
 204                 set none_count 6
 205                 set reloc_count 4
 206             }
 207             "mips*" -
 208             "score*" {
 209                 set none_count 1
 210                 set reloc_count 4
 211             }
 212             "*" {
 213                 set none_count 0
 214                 set reloc_count 3
 215             }
 216         }
 217
 218         if { ($asflags == "" || [regexp ".* contains 2 .*" $exec_output])
 219              && [regexp ".* contains $reloc_count .*" $exec_output]
 220              && [regexp -all "_NONE" $exec_output] == $none_count } then {
 221             pass "$testname (dyn reloc)"
 222         } else {
 223             fail "$testname (dyn reloc)"
 224         }
 225     }
 226 }