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Fortran: allocate()d memory is uninitialized 

allocate (vla1 (5))         ! vla1-not-allocated
  l = allocated(vla1)         ! vla1-allocated     <------------------

Expecting: ^(510-data-evaluate-expression vla1[^M
]+)?(510\^done,value="\(0, 0, 0, 0, 0\)"[^M
]+[(]gdb[)] ^M
[ ]*)
510-data-evaluate-expression vla1^M
510^done,value="(1.82987403e-09, 7.8472714e-44, 1.82987403e-09, 7.8472714e-44, 2.67929926e+20)"^M
(gdb) ^M
FAIL: gdb.mi/mi-vla-fortran.exp: evaluate allocated vla

gcc-4.9.2-6.fc21.x86_64

I think some older gfortran did initialize allocated memory but that is an
unspecified behavior.  I haven't found any initialization mentioned
in Fortran 90 standard (draft) and it is also clearly stated here:
        https://software.intel.com/en-us/forums/intel-fortran-compiler-for-linux-and-mac-os-x/topic/268786
        Initialization to 0 of allocated arrays (of integers) is an
        implementation issue. i.e. do not rely on it.

Joel Brobecker wrote:
I am wondering if it might be better to just relax instead the regexp to allow
any number rather than just remove the test altogether. The test allows us to
verify that, as soon as we're past the "allocate" call, we no longer say "not
allocated".

gdb/testsuite/ChangeLog
2015-11-03  Jan Kratochvil  <jan.kratochvil@redhat.com>
	    Joel Brobecker  <brobecker@adacore.com>

	* gdb.mi/mi-vla-fortran.exp (evaluate allocated vla): Permit any data.
This commit is contained in:
Jan Kratochvil 2015-11-04 15:52:41 +01:00
parent 6df5522640
commit 6f2f1a3a70
2 changed files with 6 additions and 1 deletions
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5
gdb/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2015-11-03 Jan Kratochvil <jan.kratochvil@redhat.com>
Joel Brobecker <brobecker@adacore.com>
* gdb.mi/mi-vla-fortran.exp (evaluate allocated vla): Permit any data.
2015-11-04 Marcin Kościelnicki <koriakin@0x04.net>
* gdb.reverse/s390-mvcle.c: New test.

2
gdb/testsuite/gdb.mi/mi-vla-fortran.exp
View File

@ -69,7 +69,7 @@ mi_run_cmd
mi_expect_stop "breakpoint-hit" "vla" "" ".*vla.f90" "$bp_lineno" \
{ "" "disp=\"del\"" } "run to breakpoint at line $bp_lineno"
mi_gdb_test "510-data-evaluate-expression vla1" \
"510\\^done,value=\"\\(0, 0, 0, 0, 0\\)\"" "evaluate allocated vla"
"510\\^done,value=\"\\(.*\\)\"" "evaluate allocated vla"
mi_create_varobj_checked vla1_allocated vla1 "real\\\(kind=4\\\) \\\(5\\\)" \
"create local variable vla1_allocated"