fort_dyn_array: add basic fortran dyn array support

Fortran provide types whose values may be dynamically allocated
or associated with a variable under explicit program control.
The purpose of this commit is:

  * to read allocated/associated DWARF tags and store them in
    the dynamic property list of main_type.

  * enable GDB to print the value of a dynamic array in Fortran
    in case the type is allocated or associated (pointer to
    dynamic array).

Examples:
    (gdb) p vla_not_allocated
    $1 = <not allocated>

    (gdb) p vla_allocated
    $1 = (1, 2, 3)

    (gdb) p vla_ptr_not_associated
    $1 = <not associated>

    (gdb) p vla_ptr_associated
    $1 = (1, 2, 3)

Add basic test coverage for most dynamic array use-cases in Fortran.
The commit contains the following tests:
  * Ensure that values of Fortran dynamic arrays
    can be evaluated correctly in various ways and states.
  * Ensure that Fortran primitives can be evaluated
    correctly when used as a dynamic array.
  * Dynamic arrays passed to subroutines and handled
    in different ways inside the routine.
  * Ensure that the ptype of dynamic arrays in
    Fortran can be printed in GDB correctly.
  * Ensure that dynamic arrays in different states
    (allocated/associated) can be evaluated.
  * Dynamic arrays passed to functions and returned from
    functions.
  * History values of dynamic arrays can be accessed and
    printed again with the correct values.
  * Dynamic array evaluations using MI protocol.
  * Sizeof output of dynamic arrays in various states.

The patch was tested using the test suite on Ubuntu 12.04 64bit.

gdb/ChangeLog:

        * dwarf2read.c (set_die_type): Add read of
        DW_AT_allocated and DW_AT_associated.
        * f-typeprint.c: New include of typeprint.h
        (f_print_type): Add check for allocated/associated
        status of type.
        (f_type_print_varspec_suffix): Add check for
        allocated/associated status of type.
        * gdbtypes.c (create_array_type_with_stride):
        Add check for valid data location of type in
        case allocated or associated attributes are set.
        Length of an array should be only calculated if
        allocated or associated is resolved as true.
        (is_dynamic_type_internal): Add check for allocated/
        associated.
        (resolve_dynamic_array): Evaluate allocated/associated
        properties.
        * gdbtypes.h (enum dynamic_prop_node_kind): <DYN_PROP_ALLOCATED>
        <DYN_PROP_ASSOCIATED>: New enums.
        (TYPE_ALLOCATED_PROP, TYPE_ASSOCIATED_PROP): New macros.
        (type_not_allocated): New function.
        (type_not_associated): New function.
        * valarith.c (value_subscripted_rvalue): Add check for
        allocated/associated.
        * valprint.c: New include of typeprint.h.
        (valprint_check_validity): Add check for allocated/associated.
        (value_check_printable): Add check for allocated/
        associated.
        * typeprint.h (val_print_not_allocated): New function.
        (val_print_not_associated): New function.
        * typeprint.c (val_print_not_allocated): New function.
        (val_print_not_associated): New function.

gdb/testsuite/ChangeLog:

        * gdb.fortran/vla-alloc-assoc.exp: New file.
        * gdb.fortran/vla-datatypes.exp: New file.
        * gdb.fortran/vla-datatypes.f90: New file.
        * gdb.fortran/vla-history.exp: New file.
        * gdb.fortran/vla-ptype-sub.exp: New file.
        * gdb.fortran/vla-ptype.exp: New file.
        * gdb.fortran/vla-sizeof.exp: New file.
        * gdb.fortran/vla-sub.f90: New file.
        * gdb.fortran/vla-value-sub-arbitrary.exp: New file.
        * gdb.fortran/vla-value-sub-finish.exp: New file.
        * gdb.fortran/vla-value-sub.exp: New file.
        * gdb.fortran/vla-value.exp: New file.
        * gdb.fortran/vla-ptr-info.exp: New file.
        * gdb.mi/mi-vla-fortran.exp: New file.
        * gdb.mi/vla.f90: New file.

2 files changed, 224 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.mi/mi-vla-fortran.exp b/gdb/testsuite/gdb.mi/mi-vla-fortran.exp
new file mode 100644
index 0000000..d191623
--- /dev/null
+++ b/gdb/testsuite/gdb.mi/mi-vla-fortran.exp
@@ -0,0 +1,182 @@
+# Copyright 2015 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Verify that, using the MI, we can evaluate a simple C Variable Length
+# Array (VLA).
+
+load_lib mi-support.exp
+set MIFLAGS "-i=mi"
+
+gdb_exit
+if [mi_gdb_start] {
+    continue
+}
+
+standard_testfile vla.f90
+
+if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable \
+     {debug f90}] != "" } {
+     untested mi-vla-fortran.exp
+     return -1
+}
+
+mi_delete_breakpoints
+mi_gdb_reinitialize_dir $srcdir/$subdir
+mi_gdb_load ${binfile}
+
+set bp_lineno [gdb_get_line_number "vla1-not-allocated"]
+mi_create_breakpoint "-t vla.f90:$bp_lineno" 1 "del" "vla" \
+  ".*vla.f90" $bp_lineno $hex \
+  "insert breakpoint at line $bp_lineno (vla not allocated)"
+mi_run_cmd
+mi_expect_stop "breakpoint-hit" "vla" "" ".*vla.f90" "$bp_lineno" \
+  { "" "disp=\"del\"" } "run to breakpoint at line $bp_lineno"
+mi_gdb_test "500-data-evaluate-expression vla1" \
+  "500\\^done,value=\"<not allocated>\"" "evaluate not allocated vla"
+
+mi_create_varobj_checked vla1_not_allocated vla1 "<not allocated>" \
+  "create local variable vla1_not_allocated"
+mi_gdb_test "501-var-info-type vla1_not_allocated" \
+  "501\\^done,type=\"<not allocated>\"" \
+  "info type variable vla1_not_allocated"
+mi_gdb_test "502-var-show-format vla1_not_allocated" \
+  "502\\^done,format=\"natural\"" \
+  "show format variable vla1_not_allocated"
+mi_gdb_test "503-var-evaluate-expression vla1_not_allocated" \
+  "503\\^done,value=\"\\\[0\\\]\"" \
+  "eval variable vla1_not_allocated"
+mi_list_array_varobj_children_with_index "vla1_not_allocated" "0" "1" \
+    "real\\\(kind=4\\\)" "get children of vla1_not_allocated"
+
+
+
+set bp_lineno [gdb_get_line_number "vla1-allocated"]
+mi_create_breakpoint "-t vla.f90:$bp_lineno" 2 "del" "vla" ".*vla.f90" \
+  $bp_lineno $hex "insert breakpoint at line $bp_lineno (vla allocated)"
+mi_run_cmd
+mi_expect_stop "breakpoint-hit" "vla" "" ".*vla.f90" "$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"
+
+mi_create_varobj_checked vla1_allocated vla1 "real\\\(kind=4\\\) \\\(5\\\)" \
+  "create local variable vla1_allocated"
+mi_gdb_test "511-var-info-type vla1_allocated" \
+  "511\\^done,type=\"real\\\(kind=4\\\) \\\(5\\\)\"" \
+  "info type variable vla1_allocated"
+mi_gdb_test "512-var-show-format vla1_allocated" \
+  "512\\^done,format=\"natural\"" \
+  "show format variable vla1_allocated"
+mi_gdb_test "513-var-evaluate-expression vla1_allocated" \
+  "513\\^done,value=\"\\\[5\\\]\"" \
+  "eval variable vla1_allocated"
+mi_list_array_varobj_children_with_index "vla1_allocated" "5" "1" \
+    "real\\\(kind=4\\\)" "get children of vla1_allocated"
+
+
+set bp_lineno [gdb_get_line_number "vla1-filled"]
+mi_create_breakpoint "-t vla.f90:$bp_lineno" 3 "del" "vla" ".*vla.f90" \
+  $bp_lineno $hex "insert breakpoint at line $bp_lineno"
+mi_run_cmd
+mi_expect_stop "breakpoint-hit" "vla" "" ".*vla.f90" "$bp_lineno" \
+  { "" "disp=\"del\"" } "run to breakpoint at line $bp_lineno"
+mi_gdb_test "520-data-evaluate-expression vla1" \
+  "520\\^done,value=\"\\(1, 1, 1, 1, 1\\)\"" "evaluate filled vla"
+
+
+set bp_lineno [gdb_get_line_number "vla1-modified"]
+mi_create_breakpoint "-t vla.f90:$bp_lineno" 4 "del" "vla" ".*vla.f90" \
+  $bp_lineno $hex "insert breakpoint at line $bp_lineno"
+mi_run_cmd
+mi_expect_stop "breakpoint-hit" "vla" "" ".*vla.f90" "$bp_lineno" \
+  { "" "disp=\"del\"" } "run to breakpoint at line $bp_lineno"
+mi_gdb_test "530-data-evaluate-expression vla1" \
+  "530\\^done,value=\"\\(1, 42, 1, 24, 1\\)\"" "evaluate filled vla"
+mi_gdb_test "540-data-evaluate-expression vla1(1)" \
+  "540\\^done,value=\"1\"" "evaluate filled vla"
+mi_gdb_test "550-data-evaluate-expression vla1(2)" \
+  "550\\^done,value=\"42\"" "evaluate filled vla"
+mi_gdb_test "560-data-evaluate-expression vla1(4)" \
+  "560\\^done,value=\"24\"" "evaluate filled vla"
+
+
+set bp_lineno [gdb_get_line_number "vla1-deallocated"]
+mi_create_breakpoint "-t vla.f90:$bp_lineno" 5 "del" "vla" ".*vla.f90" \
+  $bp_lineno $hex "insert breakpoint at line $bp_lineno"
+mi_run_cmd
+mi_expect_stop "breakpoint-hit" "vla" "" ".*vla.f90" "$bp_lineno" \
+  { "" "disp=\"del\"" } "run to breakpoint at line $bp_lineno"
+mi_gdb_test "570-data-evaluate-expression vla1" \
+  "570\\^done,value=\"<not allocated>\"" "evaluate not allocated vla"
+
+
+set bp_lineno [gdb_get_line_number "pvla2-not-associated"]
+mi_create_breakpoint "-t vla.f90:$bp_lineno" 6 "del" "vla" ".*vla.f90" \
+  $bp_lineno $hex "insert breakpoint at line $bp_lineno"
+mi_run_cmd
+mi_expect_stop "breakpoint-hit" "vla" "" ".*vla.f90" "$bp_lineno" \
+  { "" "disp=\"del\"" } "run to breakpoint at line $bp_lineno"
+mi_gdb_test "580-data-evaluate-expression pvla2" \
+  "580\\^done,value=\"<not associated>\"" "evaluate not associated vla"
+
+mi_create_varobj_checked pvla2_not_associated pvla2 "<not associated>" \
+  "create local variable pvla2_not_associated"
+mi_gdb_test "581-var-info-type pvla2_not_associated" \
+  "581\\^done,type=\"<not associated>\"" \
+  "info type variable pvla2_not_associated"
+mi_gdb_test "582-var-show-format pvla2_not_associated" \
+  "582\\^done,format=\"natural\"" \
+  "show format variable pvla2_not_associated"
+mi_gdb_test "583-var-evaluate-expression pvla2_not_associated" \
+  "583\\^done,value=\"\\\[0\\\]\"" \
+  "eval variable pvla2_not_associated"
+mi_list_array_varobj_children_with_index "pvla2_not_associated" "0" "1" \
+    "real\\\(kind=4\\\)" "get children of pvla2_not_associated"
+
+
+set bp_lineno [gdb_get_line_number "pvla2-associated"]
+mi_create_breakpoint "-t vla.f90:$bp_lineno" 7 "del" "vla" ".*vla.f90" \
+  $bp_lineno $hex "insert breakpoint at line $bp_lineno"
+mi_run_cmd
+mi_expect_stop "breakpoint-hit" "vla" "" ".*vla.f90" "$bp_lineno" \
+  { "" "disp=\"del\"" } "run to breakpoint at line $bp_lineno"
+mi_gdb_test "590-data-evaluate-expression pvla2" \
+  "590\\^done,value=\"\\(\\( 2, 2, 2, 2, 2\\) \\( 2, 2, 2, 2, 2\\) \\)\"" \
+  "evaluate associated vla"
+
+mi_create_varobj_checked pvla2_associated pvla2 \
+  "real\\\(kind=4\\\) \\\(5,2\\\)" "create local variable pvla2_associated"
+mi_gdb_test "591-var-info-type pvla2_associated" \
+  "591\\^done,type=\"real\\\(kind=4\\\) \\\(5,2\\\)\"" \
+  "info type variable pvla2_associated"
+mi_gdb_test "592-var-show-format pvla2_associated" \
+  "592\\^done,format=\"natural\"" \
+  "show format variable pvla2_associated"
+mi_gdb_test "593-var-evaluate-expression pvla2_associated" \
+  "593\\^done,value=\"\\\[2\\\]\"" \
+  "eval variable pvla2_associated"
+
+
+set bp_lineno [gdb_get_line_number "pvla2-set-to-null"]
+mi_create_breakpoint "-t vla.f90:$bp_lineno" 8 "del" "vla" ".*vla.f90" \
+  $bp_lineno $hex "insert breakpoint at line $bp_lineno"
+mi_run_cmd
+mi_expect_stop "breakpoint-hit" "vla" "" ".*vla.f90" "$bp_lineno" \
+  { "" "disp=\"del\"" } "run to breakpoint at line $bp_lineno"
+mi_gdb_test "600-data-evaluate-expression pvla2" \
+  "600\\^done,value=\"<not associated>\"" "evaluate vla pointer set to null"
+
+mi_gdb_exit
+return 0
diff --git a/gdb/testsuite/gdb.mi/vla.f90 b/gdb/testsuite/gdb.mi/vla.f90
new file mode 100644
index 0000000..0b89d34
--- /dev/null
+++ b/gdb/testsuite/gdb.mi/vla.f90
@@ -0,0 +1,42 @@
+! Copyright 2015 Free Software Foundation, Inc.
+!
+! This program is free software; you can redistribute it and/or modify
+! it under the terms of the GNU General Public License as published by
+! the Free Software Foundation; either version 3 of the License, or
+! (at your option) any later version.
+!
+! This program is distributed in the hope that it will be useful,
+! but WITHOUT ANY WARRANTY; without even the implied warranty of
+! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+! GNU General Public License for more details.
+!
+! You should have received a copy of the GNU General Public License
+! along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+program vla
+  real, allocatable :: vla1 (:)
+  real, target, allocatable :: vla2(:, :)
+  real, pointer :: pvla2 (:, :)
+  logical :: l
+
+  allocate (vla1 (5))         ! vla1-not-allocated
+  l = allocated(vla1)         ! vla1-allocated
+
+  vla1(:) = 1
+  vla1(2) = 42                ! vla1-filled
+  vla1(4) = 24
+
+  deallocate (vla1)           ! vla1-modified
+  l = allocated(vla1)         ! vla1-deallocated
+
+  allocate (vla2 (5, 2))
+  vla2(:, :) = 2
+
+  pvla2 => vla2               ! pvla2-not-associated
+  l = associated(pvla2)       ! pvla2-associated
+
+  pvla2(2, 1) = 42
+
+  pvla2 => null()
+  l = associated(pvla2)       ! pvla2-set-to-null
+end program vla