* gcc-interface/ada-tree.h (DECL_CAN_NEVER_BE_NULL_P): New macro.
* gcc-interface/decl.c (gnat_to_gnu_entity) <object>: Set the flag.
(gnat_to_gnu_param): Likewise.
* gcc-interface/utils.c (convert) <UNCONSTRAINED_ARRAY_REF>: Invoke
maybe_unconstrained_array instead of doing the work manually.
(maybe_unconstrained_array): Propagate the TREE_THIS_NOTRAP flag.
* gcc-interface/utils2.c (build_unary_op) <INDIRECT_REF>: If operand
is a DECL with the flag, set TREE_THIS_NOTRAP on the reference.
(gnat_stabilize_reference_1): Propagate the TREE_THIS_NOTRAP flag.
(gnat_stabilize_reference): Likewise.
From-SVN: r179182
* gcc-interface/ada-tree.h (TYPE_NULL_BOUNDS): New macro.
(SET_TYPE_NULL_BOUNDS): Likewise.
* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Array_Type>: Set again
TREE_THIS_NOTRAP on the INDIRECT_REF node built for the template.
* gcc-interface/trans.c (Identifier_to_gnu): Return initializers of fat
pointer types.
* gcc-interface/utils.c (create_var_decl_1): If the object is external,
check that the initializer is a valid constant expression for use in
initializing a static variable. Add missing guard.
(update_pointer_to): Adjust TYPE_NULL_BOUNDS if set.
(convert_to_fat_pointer): In the null fat pointer case, build a valid
pointer for the bounds.
* gcc-interface/utils2.c (compare_fat_pointers): New function.
(build_binary_op) <EQ_EXPR>: Call it to compare fat pointers.
From-SVN: r179180
* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Access_Subtype>: Use
XNEW instead of xmalloc. Do not build useless pointer type.
<E_Anonymous_Access_Subprogram_Type>: Use XNEW instead of xmalloc.
* gcc-interface/trans.c (gnat_to_gnu) <N_Raise_Constraint_Error>: Tidy.
* gcc-interface/utils2.c (build_unary_op): Remove local variable.
From-SVN: r179168
* gcc-interface/utils.c (maybe_unconstrained_array): In the reference
to unconstrained array case, deal with each branch of a COND_EXPR.
* gcc-interface/utils2.c (build_allocator): Deal with each branch of
a COND_EXPR in the initializer, if present.
From-SVN: r178766
* gcc-interface/trans.c (build_return_expr): Use void_type_node for
MODIFY_EXPR.
* gcc-interface/utils2.c (build_binary_op) <MODIFY_EXPR>: Assert that
the result type is null if ENABLE_CHECKING. Set operation_type at the
end unconditionally if not set in the previous cases.
Use build2 and void_type_node for MODIFY_EXPR.
(build_allocator): Use NULL_TREE for MODIFY_EXPR.
From-SVN: r178761
2011-08-29 Thomas Quinot <quinot@adacore.com>
* rtsfind.ads, exp_ch3.adb (In_Runtime): Minor code improvement, use
Is_RTU instead of using Chars comparisons.
2011-08-29 Thomas Quinot <quinot@adacore.com>
* exp_strm.adb (Build_Mutable_Record_Read_Procedure): Do not create a
temporary object if the actual is constrained, and the discriminants
read from the stream don't match.
2011-08-29 Tristan Gingold <gingold@adacore.com>
* sem_attr.adb, exp_attr.adb: Add handling of
Attribute_System_Allocator_Alignment
* snames.ads-tmpl: Add Name_System_Allocator_Alignment and
Attribute_System_Allocator_Alignment.
* ttypes.ads, get_targ.ads: Add Get_System_Allocator_Alignment.
* gcc-interface/targtyps.c, gcc-interface/utils2.c,
gcc-interface/gigi.h: Renames get_target_default_allocator_alignment to
get_target_system_allocator_alignment.
2011-08-29 Arnaud Charlet <charlet@adacore.com>
* gcc-interface/Makefile.in, gcc-interface/Make-lang.in: Update
dependencies.
From-SVN: r178176
* gcc-interface/gigi.h (build_function_stub): Remove.
(build_return_expr): Likewise.
(convert_vms_descriptor): Declare.
* gcc-interface/utils.c (convert_vms_descriptor): Make global.
(build_function_stub): Move to...
* gcc-interface/utils2.c (build_return_expr): Move to...
* gcc-interface/trans.c (build_function_stub): ...here.
(build_return_expr): ...here.
(Subprogram_Body_to_gnu): Add local variable for language_function.
Disconnect the parameter attributes cache, if any, once done with it.
Call end_subprog_body only after setting the end_locus.
Build the stub associated with the function, if any, at the very end.
(gnat_to_gnu) <N_Return_Statement>: Remove couple of useless local
variables and streamline control flow.
From-SVN: r176712
PR ada/48844
* gcc-interface/gigi.h (get_variant_part): Declare.
* gcc-interface/decl.c (get_variant_part): Make global.
* gcc-interface/utils2.c (find_common_type): Do not return T1 if the
types have the same constant size, are record types and T1 has a
variant part while T2 doesn't.
From-SVN: r173442
* einfo.ads (Size_Depends_On_Discriminant): Adjust description.
* layout.adb (Compute_Size_Depends_On_Discriminant): New procedure
to compute Set_Size_Depends_On_Discriminant.
(Layout_Type): Call it on array types in back-end layout mode.
* sem_util.adb (Requires_Transient_Scope): Return true for array
types only if the size depends on the value of discriminants.
* gcc-interface/utils2.c (build_binary_op) <MODIFY_EXPR>: Use the RHS
type if the RHS is a call to a function that returns an unconstrained
type with default discriminant.
From-SVN: r171402
* gcc-interface/gigi.h (fill_vms_descriptor): Take GNU_TYPE instead of
GNAT_FORMAL.
* gcc-interface/utils2.c (fill_vms_descriptor): Move from here to...
* gcc-interface/utils.c (fill_vms_descriptor): ...here. Take GNU_TYPE
instead of GNAT_FORMAL. Protect the expression against multiple uses.
Do not generate the check directly, instead instantiate the template
check present in the descriptor.
(make_descriptor_field): Move around.
(build_vms_descriptor32): Build a template check in the POINTER field.
(build_vms_descriptor): Remove useless suffixes.
* gcc-interface/trans.c (call_to_gnu): Adjust fill_vms_descriptor call.
From-SVN: r169788
* gcc-interface/trans.c (gigi): Don't set 'pure' flag on SJLJ routines.
* gcc-interface/utils2.c (compare_arrays): Add LOC parameter. Set it
directly on all the comparison expressions.
(build_binary_op): Pass input_location to compare_arrays.
From-SVN: r166533
2010-10-26 Richard Kenner <kenner@vlsi1.ultra.nyu.edu>
* gcc-interface/utils2.c (build_compound_expr): New function.
* gcc-interface/gigi.h (build_compound_expr): Declare it.
* gcc-interface/trans.c (Attribute_to_gnu, call_to_gnu): Use it.
(gnat_to_gnu, case N_Expression_With_Actions): Likewise.
From-SVN: r165958
* gcc-interface/utils2.c: Include flags.h and remove prototypes.
(build_unary_op) <TRUTH_NOT_EXPR>: When not optimizing, fold the result
of the call to invert_truthvalue_loc.
* gcc-interface/Make-lang.in (utils2.o): Add $(FLAGS_H).
From-SVN: r165928
* sched-deps.c (sched_insn_is_legitimate_for_speculation): Invoke
may_trap_or_fault_p instead of may_trap_p predicate.
* tree.c (substitute_in_expr): Propagate the TREE_THIS_NOTRAP flag.
(substitute_placeholder_in_expr): Likewise.
* tree-inline.c (remap_gimple_op_r): Propagate the TREE_THIS_NOTRAP
flag on MEM_REF nodes.
(copy_tree_body_r): Propagate the TREE_READONLY and TREE_THIS_NOTRAP
flags on INDIRECT_REF nodes.
ada/
* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Array_Type>: Set
TREE_THIS_NOTRAP on the INDIRECT_REF node built for the template.
* gcc-interface/trans.c (Identifier_to_gnu): Set TREE_THIS_NOTRAP on
the INDIRECT_REF node built for objects used by reference.
* gcc-interface/utils2.c (build_binary_op): Add short-circuit for
constant result. Set TREE_THIS_NOTRAP on ARRAY_REF and ARRAY_RANGE_REF.
(gnat_stabilize_reference_1): Propagate the TREE_THIS_NOTRAP flag.
From-SVN: r165468
2010-10-11 Tristan Gingold <gingold@adacore.com>
* gcc-interface/utils2.c (maybe_wrap_malloc): Fix crash when allocating
very large object on VMS.
From-SVN: r165288
* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Constant>: Look into
expressions for external constants that are aggregates.
* gcc-interface/utils2.c (build_simple_component_ref): If the field
is an inherited component in an extension, look through the extension.
From-SVN: r164414
* gcc-interface/utils.c: Do not include function.h, pointer-set.h,
and gimple.h. Explain why rtl.h has to be included.
(handle_vector_size_attribute): Call reconstruct_complex_type directly.
* gcc-interface/targtyps.c: Do not include tm_p.h
* gcc-interface/utils2.c: Do not include flags.h.
* gcc-interface/trans.c: Do not include expr.h. Include rtl.h instead,
and explain why it has to be included.
* gcc-interface/misc.c: Do not include expr.h, libfuncs.h, cgraph.h,
and optabs.h.
Include function.h and explain why. Explain why except.h is included.
(enumerate_modes): Remove unused function.
* gcc-interface/gigi.h (enumerate_modes): Remove prototype.
* gcc-interface/Make-lang.in: Update dependencies.
From-SVN: r159844
* uintp.h (UI_Lt): Declare.
* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Array_Type>: Do the size
computation in sizetype.
<E_Array_Subtype>: Use unified handling for all index types. Do not
generate MAX_EXPR-based expressions, only COND_EXPR-based ones. Add
bypass for PATs.
(annotate_value): Change test for negative values.
(validate_size): Apply test for negative values on GNAT nodes.
(set_rm_size): Likewise.
* gcc-interface/misc.c (gnat_init): Set unsigned types for sizetypes.
* gcc-interface/utils.c (rest_of_record_type_compilation): Change test
for negative values.
(max_size) <MINUS_EXPR>: Do not reassociate a COND_EXPR on the LHS.
(builtin_type_for_size): Adjust definition of signed_size_type_node.
* gcc-interface/utils2.c (compare_arrays): Optimize comparison of
lengths against zero.
From-SVN: r158466
* gcc-interface/gigi.h (enum standard_datatypes): Add new values
ADT_sbitsize_one_node and ADT_sbitsize_unit_node.
(sbitsize_one_node): New macro.
(sbitsize_unit_node): Likewise.
* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Array_Subtype>: Fix
latent bug in the computation of subrange_p. Fold wider_p predicate.
(cannot_be_superflat_p): Use an explicitly signed 64-bit type to do
the final comparison.
(make_aligning_type): Build real negation and use sizetype throughout
the offset computation.
(maybe_pad_type): Do not issue the warning when the new size expression
is too complex.
(annotate_value) <INTEGER_CST>: Simplify code handling negative values.
* gcc-interface/misc.c (gnat_init): Initialize sbitsize_one_node and
sbitsize_unit_node.
* gcc-interface/trans.c (Attribute_to_gnu) <Attr_Pool_Address>: Fold
double negation.
(gnat_to_gnu) <N_Free_Statement>: Likewise.
* gcc-interface/utils.c (convert): Use sbitsize_unit_node.
* gcc-interface/utils2.c (compare_arrays): Compute real lengths and use
constants in sizetype. Remove dead code and tweak comments. Generate
equality instead of inequality comparisons for zero length tests.
From-SVN: r158461
* gcc-interface/decl.c (gnat_to_gnu_entity): Use boolean_type_node in
lieu of integer_type_node for boolean operations.
(choices_to_gnu): Likewise.
* gcc-interface/trans.c (Attribute_to_gnu): Likewise.
(Loop_Statement_to_gnu): Likewise.
(establish_gnat_vms_condition_handler): Likewise.
(Exception_Handler_to_gnu_sjlj): Likewise.
(gnat_to_gnu): Likewise.
(build_unary_op_trapv): Likewise.
(build_binary_op_trapv): Likewise.
(emit_range_check): Likewise.
(emit_index_check): Likewise.
(convert_with_check): Likewise.
* gcc-interface/utils.c (convert_vms_descriptor64): Likewise.
(convert_vms_descriptor32): Likewise.
(convert_vms_descriptor): Likewise.
* gcc-interface/utils2.c (nonbinary_modular_operation): Likewise.
(compare_arrays): Use boolean instead of integer constants.
(build_binary_op) <TRUTH_ANDIF_EXPR, TRUTH_ORIF_EXPR, TRUTH_AND_EXPR,
TRUTH_OR_EXPR, TRUTH_XOR_EXPR>: New case. Check that the result type
is a boolean type.
<GE_EXPR, LE_EXPR, GT_EXPR, LT_EXPR>: Remove obsolete assertion.
<EQ_EXPR, NE_EXPR>: Check that the result type is a boolean type.
<PREINC/PREDECREMENT_EXPR, POSTINC/POSTDECREMENT_EXPR>: Delete.
<TRUTH_NOT_EXPR>: Check that the result type is a boolean type.
(build_unary_op): Use boolean_type_node in lieu of integer_type_node
for boolean operations.
(fill_vms_descriptor): Likewise. Fix formatting nits.
From-SVN: r158411
* gcc-interface/cuintp.c (UI_To_gnu): Fix long line.
* gcc-interface/gigi.h (MARK_VISITED): Skip objects of constant class.
(process_attributes): Delete.
(post_error_ne_num): Change parameter name.
* gcc-interface/decl.c (gnat_to_gnu_entity): Do not force debug info
with -g3. Remove a couple of obsolete lines. Minor tweaks.
If type annotating mode, operate on trees to compute the adjustment to
the sizes of tagged types. Fix long line.
(cannot_be_superflat_p): Tweak head comment.
(annotate_value): Fold local constant.
(set_rm_size): Fix long line.
* gcc-interface/trans.c (Identifier_to_gnu): Rework comments.
(Attribute_to_gnu): Fix long line.
<Attr_Size>: Remove useless assertion.
Reorder statements. Use size_binop routine.
(Loop_Statement_to_gnu): Use build5 in lieu of build_nt.
Create local variables for the label and the test. Tweak comments.
(Subprogram_Body_to_gnu): Reset cfun to NULL.
(Compilation_Unit_to_gnu): Use the Sloc of the Unit node.
(process_inlined_subprograms): Integrate into...
(Compilation_Unit_to_gnu): ...this.
(gnat_to_gnu): Fix long line.
(post_error_ne_num): Change parameter name.
* gcc-interface/utils.c (process_attributes): Static-ify.
<ATTR_MACHINE_ATTRIBUTE>: Set input_location before proceeding.
(create_type_decl): Add comment.
(create_var_decl_1): Process the attributes after adding the VAR_DECL
to the current binding level.
(create_subprog_decl): Likewise for the FUNCTION_DECL.
(end_subprog_body): Do not reset cfun to NULL.
(build_vms_descriptor32): Fix long line.
(build_vms_descriptor): Likewise.
(handle_nonnull_attribute): Likewise.
(convert_vms_descriptor64): Likewise.
* gcc-interface/utils2.c (fill_vms_descriptor): Fix long line.
(gnat_protect_expr): Fix thinko.
From-SVN: r158390
* gcc-interface/trans.c (gigi): Set DECL_IGNORED_P on EH functions.
(gnat_to_gnu) <N_Op_Eq>: Restore the value of input_location
before translating the top-level node.
(lvalue_required_p) <N_Function_Call>: Return 1 if !constant.
<N_Object_Declaration>: Likewise.
<N_Assignment_Statement>: Likewise.
<N_Unchecked_Type_Conversion>: Likewise.
(call_to_gnu): Remove kludge.
(gnat_to_gnu) <N_Return_Statement>: When not optimizing, force labels
associated with user returns to be preserved.
(gnat_to_gnu): Add special code to deal with boolean rvalues.
* gcc-interface/utils2.c (compare_arrays): Set input_location on all
comparisons.
(build_unary_op) <ADDR_EXPR>: Call build_fold_addr_expr.
<INDIRECT_REF>: Call build_fold_indirect_ref.
From-SVN: r158388
* gcc-interface/trans.c (call_to_gnu): Open a nesting level if this is
a statement. Otherwise, if at top-level, push the processing of the
elaboration routine. In the misaligned case, issue the error messages
again on entry and create the temporary explicitly. Do not issue them
for CONSTRUCTORs.
For a function call, emit the range check if necessary.
In the copy-in copy-out case, create the temporary for the return
value explicitly.
Do not unnecessarily convert by-ref parameters to the formal's type.
Remove obsolete guards in conditions.
(gnat_to_gnu) <N_Assignment_Statement>: For a function call, pass the
target to call_to_gnu in all cases.
(gnat_gimplify_expr) <ADDR_EXPR>: Remove handling of SAVE_EXPR.
(addressable_p) <CONSTRUCTOR>: Return false if not static.
<COMPOUND_EXPR>: New case.
* gcc-interface/utils2.c (build_unary_op) <ADDR_EXPR>: Fold a compound
expression if it has unconstrained array type.
(gnat_mark_addressable) <COMPOUND_EXPR>: New case.
(gnat_stabilize_reference) <COMPOUND_EXPR>: Stabilize operands on an
individual basis.
From-SVN: r158371
* gimple.c (walk_gimple_op) <GIMPLE_ASSIGN>: Do not request a pure
rvalue on the RHS if the LHS is of a non-renamable type.
* tree-ssa-ccp.c (maybe_fold_offset_to_component_ref): Fold result.
ada/
* gcc-interface/ada-tree.h (TYPE_BY_REFERENCE_P): Delete.
(DECL_CONST_ADDRESS_P): New macro.
(SET_DECL_ORIGINAL_FIELD_TO_FIELD): Likewise.
(SAME_FIELD_P): Likewise.
* gcc-interface/decl.c (constructor_address_p): New static function.
(gnat_to_gnu_entity) <object>: Set DECL_CONST_ADDRESS_P according to
the return value of above function.
(gnat_to_gnu_entity) <E_Record_Type>: Force BLKmode for all types
passed by reference.
<E_Record_Subtype>: Likewise.
Set TREE_ADDRESSABLE on the type if it passed by reference.
(make_packable_type): Use SET_DECL_ORIGINAL_FIELD_TO_FIELD.
(create_field_decl_from): Likewise.
(substitute_in_type): Likewise.
(purpose_member_field): Use SAME_FIELD_P.
* gcc-interface/misc.c (must_pass_by_ref): Test TREE_ADDRESSABLE.
* gcc-interface/trans.c (lvalue_required_p): Add ADDRESS_OF_CONSTANT
parameter and adjust recursive calls.
<N_Explicit_Dereference>: New case.
<N_Object_Declaration>: Return 1 if the object is of a class-wide type.
Adjust calls to lvalue_required_p. Do not return the initializer of a
DECL_CONST_ADDRESS_P constant if an lvalue is required for it.
(call_to_gnu): Delay issuing error message for a misaligned actual and
avoid the associated back-end assertion. Test TREE_ADDRESSABLE.
(gnat_gimplify_expr) <ADDR_EXPR>: Handle non-static constructors.
* gcc-interface/utils.c (make_dummy_type): Set TREE_ADDRESSABLE if the
type is passed by reference.
(convert) <CONSTRUCTOR>: Convert in-place in more cases.
* gcc-interface/utils2.c (build_cond_expr): Drop TYPE_BY_REFERENCE_P.
(build_simple_component_ref): Use SAME_FIELD_P.
From-SVN: r158254
* gcc-interface/trans.c (lvalue_required_for_attribute_p): New static
function.
(lvalue_required_p) <N_Attribute_Reference>: Call it.
(gnat_to_gnu) <N_Selected_Component>: Prevent build_component_ref from
folding the result only if lvalue_required_for_attribute_p is true.
* gcc-interface/utils.c (maybe_unconstrained_array): Pass correctly
typed constant to build_component_ref.
(unchecked_convert): Likewise.
* gcc-interface/utils2.c (maybe_wrap_malloc): Likewise.
(build_allocator): Likewise.
From-SVN: r158202
* gcc-interface/gigi.h (gnat_mark_addressable): Rename parameter.
* gcc-interface/decl.c (maybe_variable): Do not set TREE_STATIC on _REF
node. Use the type of the operand to set TREE_READONLY.
* gcc-interface/trans.c (Identifier_to_gnu): Do not set TREE_STATIC on
_REF node. Do not overwrite TREE_READONLY.
(call_to_gnu): Rename local variable and fix various nits. In the
copy-in/copy-out case, build the SAVE_EXPR manually.
(convert_with_check): Call protect_multiple_eval in lieu of save_expr
and fold the computations.
(protect_multiple_eval): Always save entire fat pointers.
(maybe_stabilize_reference): Minor tweaks.
(gnat_stabilize_reference_1): Likewise. Do not deal with tcc_constant,
tcc_type and tcc_statement.
* gcc-interface/utils.c (convert_to_fat_pointer): Call
protect_multiple_eval in lieu of save_expr.
(convert): Minor tweaks.
(maybe_unconstrained_array): Do not set TREE_STATIC on _REF node.
(builtin_type_for_size): Call gnat_type_for_size directly.
* gcc-interface/utils2.c (contains_save_expr_p): Delete.
(contains_null_expr): Likewise
(gnat_build_constructor): Do not call it.
(compare_arrays): Deal with all side-effects, use protect_multiple_eval
instead of gnat_stabilize_reference to protect the operands.
(nonbinary_modular_operation): Call protect_multiple_eval in lieu of
save_expr.
(maybe_wrap_malloc): Likewise.
(build_allocator): Likewise.
(build_unary_op) <INDIRECT_REF>: Do not set TREE_STATIC on _REF node.
(gnat_mark_addressable): Rename parameter.
From-SVN: r158156
* tree.h (TREE_ADDRESSABLE): Document its effect for function types.
* calls.c (expand_call): Pass the function type to aggregate_value_p.
* function.c (aggregate_value_p): Do not honor DECL_BY_REFERENCE on
the target function of a CALL_EXPR. Honor TREE_ADDRESSABLE on the
function type instead. Reorder and simplify checks.
* gimplify.c (gimplify_modify_expr_rhs) <WITH_SIZE_EXPR>: New case.
ada/
* gcc-interface/ada-tree.h (TYPE_RETURNS_UNCONSTRAINED_P): Rename into.
(TYPE_RETURN_UNCONSTRAINED_P): ...this.
(TYPE_RETURNS_BY_REF_P): Rename into.
(TYPE_RETURN_BY_DIRECT_REF_P): ...this.
(TYPE_RETURNS_BY_TARGET_PTR_P): Delete.
* gcc-interface/gigi.h (create_subprog_type): Adjust parameter names.
(build_return_expr): Likewise.
* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Subprogram_Type>:
Rename local variables. If the return Mechanism is By_Reference, pass
return_by_invisible_ref_p to create_subprog_type instead of toggling
TREE_ADDRESSABLE. Test return_by_invisible_ref_p in order to annotate
the mechanism. Use regular return for contrained types with non-static
size and return by invisible reference for unconstrained return types
with default discriminants. Update comment.
* gcc-interface/trans.c (Subprogram_Body_to_gnu): If the function
returns by invisible reference, turn the RESULT_DECL into a pointer.
Do not handle DECL_BY_REF_P in the CICO case here.
(call_to_gnu): Remove code handling return by target pointer. For a
function call, if the return type has non-constant size, generate the
assignment with an INIT_EXPR.
(gnat_to_gnu) <N_Return_Statement>: Remove dead code in the CICO case.
If the function returns by invisible reference, build the copy return
operation manually.
(add_decl_expr): Initialize the variable with an INIT_EXPR.
* gcc-interface/utils.c (create_subprog_type): Adjust parameter names.
Adjust for renaming of macros. Copy the node only when necessary.
(create_subprog_decl): Do not toggle TREE_ADDRESSABLE on the return
type, only change DECL_BY_REFERENCE on the RETURN_DECL.
(convert_from_reference): Delete.
(is_byref_result): Likewise.
(gnat_genericize_r): Likewise.
(gnat_genericize): Likewise.
(end_subprog_body): Do not call gnat_genericize.
* gcc-interface/utils2.c (build_binary_op) <INIT_EXPR>: New case.
(build_return_expr): Adjust parameter names, logic and comment.
From-SVN: r158139
PR ada/42253
* gcc-interface/utils2.c (build_binary_op) <EQ_EXPR>: Assert that fat
pointer base types are variant of each other. Apply special treatment
for null to fat pointer types in all cases.
From-SVN: r157107
