From d87e299dd2b7f4be6ca829e80cd94babc53fa12f Mon Sep 17 00:00:00 2001 From: Harald Anlauf Date: Thu, 10 Nov 2022 22:30:27 +0100 Subject: [PATCH] Fortran: fix treatment of character, value, optional dummy arguments [PR107444] Fix handling of character dummy arguments that have the optional+value attribute. Change name of internal symbols that carry the hidden presence status of optional arguments to distinguish them from the internal hidden character length. Update documentation to clarify the gfortran ABI. gcc/fortran/ChangeLog: PR fortran/107444 * trans-decl.cc (create_function_arglist): Extend presence status to all intrinsic types, and change prefix of internal symbol to '.'. * trans-expr.cc (gfc_conv_expr_present): Align to changes in create_function_arglist. (gfc_conv_procedure_call): Fix generation of procedure arguments for the case of character dummy arguments with optional+value attribute. * trans-types.cc (gfc_get_function_type): Synchronize with changes to create_function_arglist. * doc/gfortran/naming-and-argument-passing-conventions.rst: Clarify the gfortran argument passing conventions with regard to OPTIONAL dummy arguments of intrinsic type. gcc/testsuite/ChangeLog: PR fortran/107444 * gfortran.dg/optional_absent_7.f90: Adjust regex. * gfortran.dg/optional_absent_8.f90: New test. --- ...aming-and-argument-passing-conventions.rst | 3 +- gcc/fortran/trans-decl.cc | 10 ++-- gcc/fortran/trans-expr.cc | 25 ++++++--- gcc/fortran/trans-types.cc | 14 ++--- .../gfortran.dg/optional_absent_7.f90 | 2 +- .../gfortran.dg/optional_absent_8.f90 | 53 +++++++++++++++++++ 6 files changed, 84 insertions(+), 23 deletions(-) create mode 100644 gcc/testsuite/gfortran.dg/optional_absent_8.f90 diff --git a/gcc/fortran/doc/gfortran/naming-and-argument-passing-conventions.rst b/gcc/fortran/doc/gfortran/naming-and-argument-passing-conventions.rst index 4baaee9bfec..fa999fac355 100644 --- a/gcc/fortran/doc/gfortran/naming-and-argument-passing-conventions.rst +++ b/gcc/fortran/doc/gfortran/naming-and-argument-passing-conventions.rst @@ -142,8 +142,7 @@ is used for dummy arguments; with ``VALUE``, those variables are passed by value. For ``OPTIONAL`` dummy arguments, an absent argument is denoted -by a NULL pointer, except for scalar dummy arguments of type -``INTEGER``, ``LOGICAL``, ``REAL`` and ``COMPLEX`` +by a NULL pointer, except for scalar dummy arguments of intrinsic type which have the ``VALUE`` attribute. For those, a hidden Boolean argument (``logical(kind=C_bool),value``) is used to indicate whether the argument is present. diff --git a/gcc/fortran/trans-decl.cc b/gcc/fortran/trans-decl.cc index 94988b8690e..217de6b8da0 100644 --- a/gcc/fortran/trans-decl.cc +++ b/gcc/fortran/trans-decl.cc @@ -2708,16 +2708,16 @@ create_function_arglist (gfc_symbol * sym) type = gfc_sym_type (f->sym); } } - /* For noncharacter scalar intrinsic types, VALUE passes the value, + /* For scalar intrinsic types, VALUE passes the value, hence, the optional status cannot be transferred via a NULL pointer. Thus, we will use a hidden argument in that case. */ - else if (f->sym->attr.optional && f->sym->attr.value - && !f->sym->attr.dimension && f->sym->ts.type != BT_CLASS - && !gfc_bt_struct (f->sym->ts.type)) + if (f->sym->attr.optional && f->sym->attr.value + && !f->sym->attr.dimension && f->sym->ts.type != BT_CLASS + && !gfc_bt_struct (f->sym->ts.type)) { tree tmp; strcpy (&name[1], f->sym->name); - name[0] = '_'; + name[0] = '.'; tmp = build_decl (input_location, PARM_DECL, get_identifier (name), boolean_type_node); diff --git a/gcc/fortran/trans-expr.cc b/gcc/fortran/trans-expr.cc index f3fbb527157..b95c5cf2f96 100644 --- a/gcc/fortran/trans-expr.cc +++ b/gcc/fortran/trans-expr.cc @@ -1985,15 +1985,14 @@ gfc_conv_expr_present (gfc_symbol * sym, bool use_saved_desc) /* Intrinsic scalars with VALUE attribute which are passed by value use a hidden argument to denote the present status. */ - if (sym->attr.value && sym->ts.type != BT_CHARACTER - && sym->ts.type != BT_CLASS && sym->ts.type != BT_DERIVED - && !sym->attr.dimension) + if (sym->attr.value && !sym->attr.dimension + && sym->ts.type != BT_CLASS && !gfc_bt_struct (sym->ts.type)) { char name[GFC_MAX_SYMBOL_LEN + 2]; tree tree_name; gcc_assert (TREE_CODE (decl) == PARM_DECL); - name[0] = '_'; + name[0] = '.'; strcpy (&name[1], sym->name); tree_name = get_identifier (name); @@ -6162,11 +6161,21 @@ gfc_conv_procedure_call (gfc_se * se, gfc_symbol * sym, value, pass "0" and a hidden argument gives the optional status. */ if (fsym && fsym->attr.optional && fsym->attr.value - && !fsym->attr.dimension && fsym->ts.type != BT_CHARACTER - && fsym->ts.type != BT_CLASS && fsym->ts.type != BT_DERIVED) + && !fsym->attr.dimension && fsym->ts.type != BT_CLASS + && !gfc_bt_struct (sym->ts.type)) { - parmse.expr = fold_convert (gfc_sym_type (fsym), - integer_zero_node); + if (fsym->ts.type == BT_CHARACTER) + { + /* Pass a NULL pointer for an absent CHARACTER arg + and a length of zero. */ + parmse.expr = null_pointer_node; + parmse.string_length + = build_int_cst (gfc_charlen_type_node, + 0); + } + else + parmse.expr = fold_convert (gfc_sym_type (fsym), + integer_zero_node); vec_safe_push (optionalargs, boolean_false_node); } else diff --git a/gcc/fortran/trans-types.cc b/gcc/fortran/trans-types.cc index 42907becd27..196f2cecbfc 100644 --- a/gcc/fortran/trans-types.cc +++ b/gcc/fortran/trans-types.cc @@ -3225,15 +3225,15 @@ gfc_get_function_type (gfc_symbol * sym, gfc_actual_arglist *actual_args, vec_safe_push (hidden_typelist, type); } - /* For noncharacter scalar intrinsic types, VALUE passes the value, + /* For scalar intrinsic types, VALUE passes the value, hence, the optional status cannot be transferred via a NULL pointer. Thus, we will use a hidden argument in that case. */ - else if (arg - && arg->attr.optional - && arg->attr.value - && !arg->attr.dimension - && arg->ts.type != BT_CLASS - && !gfc_bt_struct (arg->ts.type)) + if (arg + && arg->attr.optional + && arg->attr.value + && !arg->attr.dimension + && arg->ts.type != BT_CLASS + && !gfc_bt_struct (arg->ts.type)) vec_safe_push (typelist, boolean_type_node); /* Coarrays which are descriptorless or assumed-shape pass with -fcoarray=lib the token and the offset as hidden arguments. */ diff --git a/gcc/testsuite/gfortran.dg/optional_absent_7.f90 b/gcc/testsuite/gfortran.dg/optional_absent_7.f90 index 1be981c88f6..163d0b67cb6 100644 --- a/gcc/testsuite/gfortran.dg/optional_absent_7.f90 +++ b/gcc/testsuite/gfortran.dg/optional_absent_7.f90 @@ -27,5 +27,5 @@ contains end subroutine s end program p -! { dg-final { scan-tree-dump "void s .* c, .* o, logical.* _o, integer.* _c" "original" } } +! { dg-final { scan-tree-dump "void s .* c, .* o, logical.* \.o, integer.* _c" "original" } } ! { dg-final { scan-tree-dump ", integer.*, logical.*, integer.* pp" "original" } } diff --git a/gcc/testsuite/gfortran.dg/optional_absent_8.f90 b/gcc/testsuite/gfortran.dg/optional_absent_8.f90 new file mode 100644 index 00000000000..e3c04451f3b --- /dev/null +++ b/gcc/testsuite/gfortran.dg/optional_absent_8.f90 @@ -0,0 +1,53 @@ +! { dg-do run } +! PR fortran/107444 +! +! Check that procedures with optional arguments that have the value attribute +! work for intrinsic types including character, and that the presence check +! works. +! +! Co-contributed by M.Morin + +program p + implicit none + interface + subroutine i(c, o) + character(*) :: c + character(3), optional, value :: o + end subroutine i + end interface + procedure(i), pointer :: pp + call s([.false.,.false.,.false.], 0) + call s([.true., .false.,.false.], 10, i=7) + call s([.false.,.true. ,.false.], 20, c='abc') + call s([.false.,.false.,.true. ], 30, r=3.0) + pp => f + call pp ("abcd", "xyz") +contains + subroutine s (expect,code,i,c,r) + logical, intent(in) :: expect(:) + integer, intent(in) :: code + integer , value, optional :: i + character(3), value, optional :: c + real , value, optional :: r + if (expect(1) .neqv. present (i)) stop 1+code + if (expect(2) .neqv. present (c)) stop 2+code + if (expect(3) .neqv. present (r)) stop 3+code + if (present (i)) then + if (i /= 7) stop 4+code + end if + if (present (c)) then + if (c /= "abc") stop 5+code + end if + if (present (r)) then + if (r /= 3.0) stop 6+code + end if + end subroutine s + subroutine f (c, o) + character(*) :: c + character(3), optional, value :: o + if (c /= "abcd") stop 41 + if (len (c) /= 4) stop 42 + if (.not. present (o)) stop 43 + if (o /= "xyz") stop 44 + end subroutine f +end -- 2.35.3