* *
* C Implementation File *
* *
- * Copyright (C) 1992-2009, Free Software Foundation, Inc. *
+ * Copyright (C) 1992-2010, Free Software Foundation, Inc. *
* *
* GNAT is free software; you can redistribute it and/or modify it under *
* terms of the GNU General Public License as published by the Free Soft- *
static bool array_type_has_nonaliased_component (tree, Entity_Id);
static bool compile_time_known_address_p (Node_Id);
static bool cannot_be_superflat_p (Node_Id);
+static bool constructor_address_p (tree);
static void components_to_record (tree, Node_Id, tree, int, bool, tree *,
bool, bool, bool, bool, bool);
static Uint annotate_value (tree);
&& !TREE_SIDE_EFFECTS (gnu_expr))))
{
maybe_stable_expr
- = maybe_stabilize_reference (gnu_expr, true, &stable);
+ = gnat_stabilize_reference (gnu_expr, true, &stable);
if (stable)
{
else
{
maybe_stable_expr
- = maybe_stabilize_reference (gnu_expr, true, &stable);
+ = gnat_stabilize_reference (gnu_expr, true, &stable);
if (stable)
renamed_obj = maybe_stable_expr;
DECL_IGNORED_P (gnu_decl) = 1;
}
+ /* If this is a constant, even if we don't need a true variable, we
+ may need to avoid returning the initializer in every case. That
+ can happen for the address of a (constant) constructor because,
+ upon dereferencing it, the constructor will be reinjected in the
+ tree, which may not be valid in every case; see lvalue_required_p
+ for more details. */
+ if (TREE_CODE (gnu_decl) == CONST_DECL)
+ DECL_CONST_ADDRESS_P (gnu_decl) = constructor_address_p (gnu_expr);
+
/* If this is declared in a block that contains a block with an
exception handler, we must force this variable in memory to
suppress an invalid optimization. */
break;
}
- /* Normal case of non-character type or non-Standard character type. */
{
- /* Here we have a list of enumeral constants in First_Literal.
- We make a CONST_DECL for each and build into GNU_LITERAL_LIST
- the list to be placed into TYPE_FIELDS. Each node in the list
- is a TREE_LIST whose TREE_VALUE is the literal name and whose
- TREE_PURPOSE is the value of the literal. */
-
- Entity_Id gnat_literal;
+ /* We have a list of enumeral constants in First_Literal. We make a
+ CONST_DECL for each one and build into GNU_LITERAL_LIST the list to
+ be placed into TYPE_FIELDS. Each node in the list is a TREE_LIST
+ whose TREE_VALUE is the literal name and whose TREE_PURPOSE is the
+ value of the literal. But when we have a regular boolean type, we
+ simplify this a little by using a BOOLEAN_TYPE. */
+ bool is_boolean = Is_Boolean_Type (gnat_entity)
+ && !Has_Non_Standard_Rep (gnat_entity);
tree gnu_literal_list = NULL_TREE;
+ Entity_Id gnat_literal;
if (Is_Unsigned_Type (gnat_entity))
gnu_type = make_unsigned_type (esize);
else
gnu_type = make_signed_type (esize);
- TREE_SET_CODE (gnu_type, ENUMERAL_TYPE);
+ TREE_SET_CODE (gnu_type, is_boolean ? BOOLEAN_TYPE : ENUMERAL_TYPE);
for (gnat_literal = First_Literal (gnat_entity);
Present (gnat_literal);
gnat_literal = Next_Literal (gnat_literal))
{
- tree gnu_value = UI_To_gnu (Enumeration_Rep (gnat_literal),
- gnu_type);
+ tree gnu_value
+ = UI_To_gnu (Enumeration_Rep (gnat_literal), gnu_type);
tree gnu_literal
= create_var_decl (get_entity_name (gnat_literal), NULL_TREE,
gnu_type, gnu_value, true, false, false,
gnu_value, gnu_literal_list);
}
- TYPE_VALUES (gnu_type) = nreverse (gnu_literal_list);
+ if (!is_boolean)
+ TYPE_VALUES (gnu_type) = nreverse (gnu_literal_list);
/* Note that the bounds are updated at the end of this function
to avoid an infinite recursion since they refer to the type. */
gnat_to_gnu_type
(Original_Array_Type (gnat_entity)));
+ /* We have to handle clauses that under-align the type specially. */
+ if ((Present (Alignment_Clause (gnat_entity))
+ || (Is_Packed_Array_Type (gnat_entity)
+ && Present
+ (Alignment_Clause (Original_Array_Type (gnat_entity)))))
+ && UI_Is_In_Int_Range (Alignment (gnat_entity)))
+ {
+ align = UI_To_Int (Alignment (gnat_entity)) * BITS_PER_UNIT;
+ if (align >= TYPE_ALIGN (gnu_type))
+ align = 0;
+ }
+
/* If the type we are dealing with represents a bit-packed array,
we need to have the bits left justified on big-endian targets
and right justified on little-endian targets. We also need to
{
tree gnu_field_type, gnu_field;
- /* Set the RM size before wrapping up the type. */
+ /* Set the RM size before wrapping up the original type. */
SET_TYPE_RM_SIZE (gnu_type,
UI_To_gnu (RM_Size (gnat_entity), bitsizetype));
TYPE_PACKED_ARRAY_TYPE_P (gnu_type) = 1;
+
+ /* Create a stripped-down declaration, mainly for debugging. */
+ create_type_decl (gnu_entity_name, gnu_type, NULL, true,
+ debug_info_p, gnat_entity);
+
+ /* Now save it and build the enclosing record type. */
gnu_field_type = gnu_type;
gnu_type = make_node (RECORD_TYPE);
TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "JM");
-
- /* Propagate the alignment of the modular type to the record.
- This means that bit-packed arrays have "ceil" alignment for
- their size, which may seem counter-intuitive but makes it
- possible to easily overlay them on modular types. */
- TYPE_ALIGN (gnu_type) = TYPE_ALIGN (gnu_field_type);
TYPE_PACKED (gnu_type) = 1;
+ TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_field_type);
+ TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_field_type);
+ SET_TYPE_ADA_SIZE (gnu_type, TYPE_RM_SIZE (gnu_field_type));
+
+ /* Propagate the alignment of the modular type to the record type,
+ unless there is an alignment clause that under-aligns the type.
+ This means that bit-packed arrays are given "ceil" alignment for
+ their size by default, which may seem counter-intuitive but makes
+ it possible to overlay them on modular types easily. */
+ TYPE_ALIGN (gnu_type)
+ = align > 0 ? align : TYPE_ALIGN (gnu_field_type);
- /* Create a stripped-down declaration of the original type, mainly
- for debugging. */
- create_type_decl (gnu_entity_name, gnu_field_type, NULL, true,
- debug_info_p, gnat_entity);
+ relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
/* Don't notify the field as "addressable", since we won't be taking
it's address and it would prevent create_field_decl from making a
bitfield. */
gnu_field = create_field_decl (get_identifier ("OBJECT"),
- gnu_field_type, gnu_type, 1, 0, 0, 0);
+ gnu_field_type, gnu_type, 1,
+ NULL_TREE, bitsize_zero_node, 0);
- /* Do not finalize it until after the parallel type is added. */
- finish_record_type (gnu_type, gnu_field, 0, true);
+ /* Do not emit debug info until after the parallel type is added. */
+ finish_record_type (gnu_type, gnu_field, 2, false);
+ compute_record_mode (gnu_type);
TYPE_JUSTIFIED_MODULAR_P (gnu_type) = 1;
- relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
-
- /* Make the original array type a parallel type. */
- if (debug_info_p
- && present_gnu_tree (Original_Array_Type (gnat_entity)))
- add_parallel_type (TYPE_STUB_DECL (gnu_type),
- gnat_to_gnu_type
- (Original_Array_Type (gnat_entity)));
+ if (debug_info_p)
+ {
+ /* Make the original array type a parallel type. */
+ if (present_gnu_tree (Original_Array_Type (gnat_entity)))
+ add_parallel_type (TYPE_STUB_DECL (gnu_type),
+ gnat_to_gnu_type
+ (Original_Array_Type (gnat_entity)));
- rest_of_record_type_compilation (gnu_type);
+ rest_of_record_type_compilation (gnu_type);
+ }
}
/* If the type we are dealing with has got a smaller alignment than the
natural one, we need to wrap it up in a record type and under-align
the latter. We reuse the padding machinery for this purpose. */
- else if (Present (Alignment_Clause (gnat_entity))
- && UI_Is_In_Int_Range (Alignment (gnat_entity))
- && (align = UI_To_Int (Alignment (gnat_entity)) * BITS_PER_UNIT)
- && align < TYPE_ALIGN (gnu_type))
+ else if (align > 0)
{
tree gnu_field_type, gnu_field;
/* Set the RM size before wrapping up the type. */
SET_TYPE_RM_SIZE (gnu_type,
UI_To_gnu (RM_Size (gnat_entity), bitsizetype));
+
+ /* Create a stripped-down declaration, mainly for debugging. */
+ create_type_decl (gnu_entity_name, gnu_type, NULL, true,
+ debug_info_p, gnat_entity);
+
+ /* Now save it and build the enclosing record type. */
gnu_field_type = gnu_type;
gnu_type = make_node (RECORD_TYPE);
TYPE_NAME (gnu_type) = create_concat_name (gnat_entity, "PAD");
-
- TYPE_ALIGN (gnu_type) = align;
TYPE_PACKED (gnu_type) = 1;
-
- /* Create a stripped-down declaration of the original type, mainly
- for debugging. */
- create_type_decl (gnu_entity_name, gnu_field_type, NULL, true,
- debug_info_p, gnat_entity);
+ TYPE_SIZE (gnu_type) = TYPE_SIZE (gnu_field_type);
+ TYPE_SIZE_UNIT (gnu_type) = TYPE_SIZE_UNIT (gnu_field_type);
+ SET_TYPE_ADA_SIZE (gnu_type, TYPE_RM_SIZE (gnu_field_type));
+ TYPE_ALIGN (gnu_type) = align;
+ relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
/* Don't notify the field as "addressable", since we won't be taking
it's address and it would prevent create_field_decl from making a
bitfield. */
- gnu_field = create_field_decl (get_identifier ("OBJECT"),
- gnu_field_type, gnu_type, 1, 0, 0, 0);
+ gnu_field = create_field_decl (get_identifier ("F"),
+ gnu_field_type, gnu_type, 1,
+ NULL_TREE, bitsize_zero_node, 0);
- finish_record_type (gnu_type, gnu_field, 0, false);
+ finish_record_type (gnu_type, gnu_field, 2, debug_info_p);
+ compute_record_mode (gnu_type);
TYPE_PADDING_P (gnu_type) = 1;
-
- relate_alias_sets (gnu_type, gnu_field_type, ALIAS_SET_COPY);
}
- /* Otherwise reset the alignment lest we computed it above. */
- else
- align = 0;
-
break;
case E_Floating_Point_Type:
/* Make sure we can put this into a register. */
TYPE_ALIGN (gnu_fat_type) = MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
- /* Do not finalize this record type since the types of its fields
- are still incomplete at this point. */
- finish_record_type (gnu_fat_type, tem, 0, true);
+ /* Do not emit debug info for this record type since the types of its
+ fields are still incomplete at this point. */
+ finish_record_type (gnu_fat_type, tem, 0, false);
TYPE_FAT_POINTER_P (gnu_fat_type) = 1;
/* Build a reference to the template from a PLACEHOLDER_EXPR that
= chainon (gnu_template_fields, gnu_temp_fields[index]);
/* Install all the fields into the template. */
- finish_record_type (gnu_template_type, gnu_template_fields, 0, false);
+ finish_record_type (gnu_template_type, gnu_template_fields, 0,
+ debug_info_p);
TYPE_READONLY (gnu_template_type) = 1;
/* Now make the array of arrays and update the pointer to the array
gnu_field_list = gnu_field;
}
- finish_record_type (gnu_bound_rec, gnu_field_list, 0, false);
+ finish_record_type (gnu_bound_rec, gnu_field_list, 0, true);
add_parallel_type (TYPE_STUB_DECL (gnu_type), gnu_bound_rec);
}
/* Add the fields into the record type and finish it up. */
components_to_record (gnu_type, Component_List (record_definition),
gnu_field_list, packed, definition, NULL,
- false, all_rep, false, is_unchecked_union,
- debug_info_p);
+ false, all_rep, is_unchecked_union,
+ debug_info_p, false);
- /* If it is a tagged record force the type to BLKmode to insure that
- these objects will always be put in memory. Likewise for limited
- record types. */
- if (Is_Tagged_Type (gnat_entity) || Is_Limited_Record (gnat_entity))
+ /* If it is passed by reference, force BLKmode to ensure that objects
++ of this type will always be put in memory. */
+ if (Is_By_Reference_Type (gnat_entity))
SET_TYPE_MODE (gnu_type, BLKmode);
/* We used to remove the associations of the discriminants and _Parent
&& !present_gnu_tree (Etype (gnat_field)))
gnat_to_gnu_entity (Etype (gnat_field), NULL_TREE, 0);
- /* Do not finalize it since we're going to modify it below. */
+ /* Do not emit debug info for the type yet since we're going to
+ modify it below. */
gnu_field_list = nreverse (gnu_field_list);
- finish_record_type (gnu_type, gnu_field_list, 2, true);
+ finish_record_type (gnu_type, gnu_field_list, 2, false);
/* See the E_Record_Type case for the rationale. */
- if (Is_Tagged_Type (gnat_entity)
- || Is_Limited_Record (gnat_entity))
+ if (Is_By_Reference_Type (gnat_entity))
SET_TYPE_MODE (gnu_type, BLKmode);
else
compute_record_mode (gnu_type);
gnu_subtype_marker,
0, NULL_TREE,
NULL_TREE, 0),
- 0, false);
+ 0, true);
add_parallel_type (TYPE_STUB_DECL (gnu_type),
gnu_subtype_marker);
= MIN (BIGGEST_ALIGNMENT, 2 * POINTER_SIZE);
TYPE_FAT_POINTER_P (gnu_type) = 1;
- /* Do not finalize this record type since the types of
- its fields are incomplete. */
- finish_record_type (gnu_type, fields, 0, true);
+ /* Do not emit debug info for this record type since the types
+ of its fields are incomplete. */
+ finish_record_type (gnu_type, fields, 0, false);
TYPE_OBJECT_RECORD_TYPE (gnu_old) = make_node (RECORD_TYPE);
TYPE_NAME (TYPE_OBJECT_RECORD_TYPE (gnu_old))
tree gnu_field_list = NULL_TREE;
/* Non-null for subprograms containing parameters passed by copy-in
copy-out (Ada In Out or Out parameters not passed by reference),
- in which case it is the list of nodes used to specify the values of
- the in out/out parameters that are returned as a record upon
+ in which case it is the list of nodes used to specify the values
+ of the In Out/Out parameters that are returned as a record upon
procedure return. The TREE_PURPOSE of an element of this list is
a field of the record and the TREE_VALUE is the PARM_DECL
corresponding to that field. This list will be saved in the
TYPE_CI_CO_LIST field of the FUNCTION_TYPE node we create. */
- tree gnu_return_list = NULL_TREE;
+ tree gnu_cico_list = NULL_TREE;
/* If an import pragma asks to map this subprogram to a GCC builtin,
this is the builtin DECL node. */
tree gnu_builtin_decl = NULL_TREE;
&& Is_Pure (gnat_entity));
bool volatile_flag = No_Return (gnat_entity);
- bool returns_by_ref = false;
- bool returns_unconstrained = false;
- bool returns_by_target_ptr = false;
+ bool return_by_direct_ref_p = false;
+ bool return_by_invisi_ref_p = false;
+ bool return_unconstrained_p = false;
bool has_copy_in_out = false;
bool has_stub = false;
int parmnum;
if (kind == E_Function || kind == E_Subprogram_Type)
gnu_return_type = gnat_to_gnu_type (Etype (gnat_entity));
- /* If this function returns by reference, make the actual
- return type of this function the pointer and mark the decl. */
+ /* If this function returns by reference, make the actual return
+ type of this function the pointer and mark the decl. */
if (Returns_By_Ref (gnat_entity))
{
- returns_by_ref = true;
gnu_return_type = build_pointer_type (gnu_return_type);
+ return_by_direct_ref_p = true;
}
- /* If the Mechanism is By_Reference, ensure the return type uses
- the machine's by-reference mechanism, which may not the same
- as above (e.g., it might be by passing a fake parameter). */
- else if (kind == E_Function
- && Mechanism (gnat_entity) == By_Reference)
- {
- TREE_ADDRESSABLE (gnu_return_type) = 1;
-
- /* We expect this bit to be reset by gigi shortly, so can avoid a
- type node copy here. This actually also prevents troubles with
- the generation of debug information for the function, because
- we might have issued such info for this type already, and would
- be attaching a distinct type node to the function if we made a
- copy here. */
- }
-
- /* If we are supposed to return an unconstrained array,
- actually return a fat pointer and make a note of that. Return
- a pointer to an unconstrained record of variable size. */
+ /* If the Mechanism is By_Reference, ensure this function uses the
+ target's by-invisible-reference mechanism, which may not be the
+ same as above (e.g. it might be passing an extra parameter).
+
+ Prior to GCC 4, this was handled by just setting TREE_ADDRESSABLE
+ on the result type. Everything required to pass by invisible
+ reference using the target's mechanism (e.g. an extra parameter)
+ was handled at RTL expansion time.
+
+ This doesn't work with GCC 4 any more for several reasons. First,
+ the gimplification process might need to create temporaries of this
+ type and the gimplifier ICEs on such attempts; that's why the flag
+ is now set on the function type instead. Second, the middle-end
+ now also relies on a different attribute, DECL_BY_REFERENCE on the
+ RESULT_DECL, and expects the by-invisible-reference-ness to be made
+ explicit in the function body. */
+ else if (kind == E_Function && Mechanism (gnat_entity) == By_Reference)
+ return_by_invisi_ref_p = true;
+
+ /* If we are supposed to return an unconstrained array, actually return
+ a fat pointer and make a note of that. */
else if (TREE_CODE (gnu_return_type) == UNCONSTRAINED_ARRAY_TYPE)
{
gnu_return_type = TREE_TYPE (gnu_return_type);
- returns_unconstrained = true;
+ return_unconstrained_p = true;
}
/* If the type requires a transient scope, the result is allocated
else if (Requires_Transient_Scope (Etype (gnat_entity)))
{
gnu_return_type = build_pointer_type (gnu_return_type);
- returns_unconstrained = true;
+ return_unconstrained_p = true;
}
/* If the type is a padded type and the underlying type would not
|| Has_Foreign_Convention (gnat_entity)))
gnu_return_type = TREE_TYPE (TYPE_FIELDS (gnu_return_type));
- /* If the return type has a non-constant size, we convert the function
- into a procedure and its caller will pass a pointer to an object as
- the first parameter when we call the function. This can happen for
- an unconstrained type with a maximum size or a constrained type with
- a size not known at compile time. */
- if (TYPE_SIZE_UNIT (gnu_return_type)
- && !TREE_CONSTANT (TYPE_SIZE_UNIT (gnu_return_type)))
+ /* If the return type is unconstrained, that means it must have a
+ maximum size. Use the padded type as the effective return type.
+ And ensure the function uses the target's by-invisible-reference
+ mechanism to avoid copying too much data when it returns. */
+ if (CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_return_type)))
{
- returns_by_target_ptr = true;
- gnu_param_list
- = create_param_decl (get_identifier ("TARGET"),
- build_reference_type (gnu_return_type),
- true);
- gnu_return_type = void_type_node;
+ gnu_return_type
+ = maybe_pad_type (gnu_return_type,
+ max_size (TYPE_SIZE (gnu_return_type), true),
+ 0, gnat_entity, false, false, false, true);
+ return_by_invisi_ref_p = true;
}
/* If the return type has a size that overflows, we cannot have
gcc_assert (TREE_CODE (gnu_return_type) == VOID_TYPE);
gnu_return_type = make_node (RECORD_TYPE);
TYPE_NAME (gnu_return_type) = get_identifier ("RETURN");
+ /* Set a default alignment to speed up accesses. */
+ TYPE_ALIGN (gnu_return_type)
+ = get_mode_alignment (ptr_mode);
has_copy_in_out = true;
}
&DECL_SOURCE_LOCATION (gnu_field));
TREE_CHAIN (gnu_field) = gnu_field_list;
gnu_field_list = gnu_field;
- gnu_return_list = tree_cons (gnu_field, gnu_param,
- gnu_return_list);
+ gnu_cico_list
+ = tree_cons (gnu_field, gnu_param, gnu_cico_list);
}
}
stubbed since structures are incomplete for the back-end. */
if (gnu_field_list && Convention (gnat_entity) != Convention_Stubbed)
finish_record_type (gnu_return_type, nreverse (gnu_field_list),
- 0, false);
+ 0, debug_info_p);
/* If we have a CICO list but it has only one entry, we convert
this function into a function that simply returns that one
object. */
- if (list_length (gnu_return_list) == 1)
- gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_return_list));
+ if (list_length (gnu_cico_list) == 1)
+ gnu_return_type = TREE_TYPE (TREE_PURPOSE (gnu_cico_list));
if (Has_Stdcall_Convention (gnat_entity))
prepend_one_attribute_to
gnu_param_list = nreverse (gnu_param_list);
if (has_stub)
gnu_stub_param_list = nreverse (gnu_stub_param_list);
- gnu_return_list = nreverse (gnu_return_list);
+ gnu_cico_list = nreverse (gnu_cico_list);
if (Ekind (gnat_entity) == E_Function)
- Set_Mechanism (gnat_entity,
- (returns_by_ref || returns_unconstrained
- ? By_Reference : By_Copy));
+ Set_Mechanism (gnat_entity, return_unconstrained_p
+ || return_by_direct_ref_p
+ || return_by_invisi_ref_p
+ ? By_Reference : By_Copy);
gnu_type
= create_subprog_type (gnu_return_type, gnu_param_list,
- gnu_return_list, returns_unconstrained,
- returns_by_ref, returns_by_target_ptr);
+ gnu_cico_list, return_unconstrained_p,
+ return_by_direct_ref_p,
+ return_by_invisi_ref_p);
if (has_stub)
gnu_stub_type
= create_subprog_type (gnu_return_type, gnu_stub_param_list,
- gnu_return_list, returns_unconstrained,
- returns_by_ref, returns_by_target_ptr);
+ gnu_cico_list, return_unconstrained_p,
+ return_by_direct_ref_p,
+ return_by_invisi_ref_p);
/* A subprogram (something that doesn't return anything) shouldn't
be considered const since there would be no reason for such a
|| Is_Class_Wide_Equivalent_Type (gnat_entity))
TYPE_ALIGN_OK (gnu_type) = 1;
- if (AGGREGATE_TYPE_P (gnu_type) && Is_By_Reference_Type (gnat_entity))
- TYPE_BY_REFERENCE_P (gnu_type) = 1;
+ /* If the type is passed by reference, objects of this type must be
+ fully addressable and cannot be copied. */
+ if (Is_By_Reference_Type (gnat_entity))
+ TREE_ADDRESSABLE (gnu_type) = 1;
/* ??? Don't set the size for a String_Literal since it is either
confirming or we don't handle it properly (if the low bound is
break;
case E_Class_Wide_Type:
- gnat_equiv = ((Present (Equivalent_Type (gnat_entity)))
- ? Equivalent_Type (gnat_entity)
- : Root_Type (gnat_entity));
+ gnat_equiv = Root_Type (gnat_entity);
break;
case E_Task_Type:
return (tree_int_cst_lt (gnu_hb, gnu_lb) == 0);
}
+
+/* Return true if GNU_EXPR is (essentially) the address of a CONSTRUCTOR. */
+
+static bool
+constructor_address_p (tree gnu_expr)
+{
+ while (TREE_CODE (gnu_expr) == NOP_EXPR
+ || TREE_CODE (gnu_expr) == CONVERT_EXPR
+ || TREE_CODE (gnu_expr) == NON_LVALUE_EXPR)
+ gnu_expr = TREE_OPERAND (gnu_expr, 0);
+
+ return (TREE_CODE (gnu_expr) == ADDR_EXPR
+ && TREE_CODE (TREE_OPERAND (gnu_expr, 0)) == CONSTRUCTOR);
+}
\f
/* Given GNAT_ENTITY, elaborate all expressions that are required to
be elaborated at the point of its definition, but do nothing else. */
}
}
\f
-/* Called when we need to protect a variable object using a SAVE_EXPR. */
-
-tree
-maybe_variable (tree gnu_operand)
-{
- if (TREE_CONSTANT (gnu_operand)
- || TREE_READONLY (gnu_operand)
- || TREE_CODE (gnu_operand) == SAVE_EXPR
- || TREE_CODE (gnu_operand) == NULL_EXPR)
- return gnu_operand;
-
- if (TREE_CODE (gnu_operand) == UNCONSTRAINED_ARRAY_REF)
- {
- tree gnu_result
- = build1 (UNCONSTRAINED_ARRAY_REF, TREE_TYPE (gnu_operand),
- variable_size (TREE_OPERAND (gnu_operand, 0)));
-
- TREE_READONLY (gnu_result) = TREE_STATIC (gnu_result)
- = TYPE_READONLY (TREE_TYPE (TREE_TYPE (gnu_operand)));
- return gnu_result;
- }
-
- return variable_size (gnu_operand);
-}
-\f
/* Given a GNAT tree GNAT_EXPR, for an expression which is a value within a
type definition (either a bound or a discriminant value) for GNAT_ENTITY,
return the GCC tree to use for that expression. GNU_NAME is the suffix
if (expr_global && expr_variable)
return gnu_decl;
- return expr_variable ? maybe_variable (gnu_expr) : gnu_expr;
+ return expr_variable ? gnat_save_expr (gnu_expr) : gnu_expr;
}
\f
/* Create a record type that contains a SIZE bytes long field of TYPE with a
!DECL_NONADDRESSABLE_P (old_field));
DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
- SET_DECL_ORIGINAL_FIELD
- (new_field, (DECL_ORIGINAL_FIELD (old_field)
- ? DECL_ORIGINAL_FIELD (old_field) : old_field));
-
+ SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, old_field);
if (TREE_CODE (new_type) == QUAL_UNION_TYPE)
DECL_QUALIFIER (new_field) = DECL_QUALIFIER (old_field);
field_list = new_field;
}
- finish_record_type (new_type, nreverse (field_list), 2, true);
+ finish_record_type (new_type, nreverse (field_list), 2, false);
relate_alias_sets (new_type, type, ALIAS_SET_COPY);
/* If this is a padding record, we never want to make the size smaller
orig_size, bitsize_zero_node, 1);
DECL_INTERNAL_P (field) = 1;
- /* Do not finalize it until after the auxiliary record is built. */
- finish_record_type (record, field, 1, true);
+ /* Do not emit debug info until after the auxiliary record is built. */
+ finish_record_type (record, field, 1, false);
/* Set the same size for its RM size if requested; otherwise reuse
the RM size of the original type. */
/* Unless debugging information isn't being written for the input type,
write a record that shows what we are a subtype of and also make a
variable that indicates our size, if still variable. */
- if (TYPE_NAME (record)
- && AGGREGATE_TYPE_P (type)
- && TREE_CODE (orig_size) != INTEGER_CST
+ if (TREE_CODE (orig_size) != INTEGER_CST
+ && TYPE_NAME (record)
+ && TYPE_NAME (type)
&& !(TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
&& DECL_IGNORED_P (TYPE_NAME (type))))
{
build_reference_type (type),
marker, 0, NULL_TREE, NULL_TREE,
0),
- 0, false);
+ 0, true);
add_parallel_type (TYPE_STUB_DECL (record), marker);
with Component_Alignment of Storage_Unit, -2 if this is for a record
with a specified alignment.
- DEFINITION is true if we are defining this record.
+ DEFINITION is true if we are defining this record type.
P_GNU_REP_LIST, if nonzero, is a pointer to a list to which each field
with a rep clause is to be added; in this case, that is all that should
be done with such fields.
- CANCEL_ALIGNMENT, if true, means the alignment should be zeroed before
- laying out the record. This means the alignment only serves to force
- fields to be bitfields, but not require the record to be that aligned.
- This is used for variants.
+ CANCEL_ALIGNMENT is true if the alignment should be zeroed before laying
+ out the record. This means the alignment only serves to force fields to
+ be bitfields, but not to require the record to be that aligned. This is
+ used for variants.
- ALL_REP, if true, means a rep clause was found for all the fields. This
- simplifies the logic since we know we're not in the mixed case.
+ ALL_REP is true if a rep clause is present for all the fields.
- DO_NOT_FINALIZE, if true, means that the record type is expected to be
- modified afterwards so it will not be finalized here.
+ UNCHECKED_UNION is true if we are building this type for a record with a
+ Pragma Unchecked_Union.
- UNCHECKED_UNION, if true, means that we are building a type for a record
- with a Pragma Unchecked_Union.
+ DEBUG_INFO_P is true if we need to write debug information about the type.
+
+ MAYBE_UNUSED is true if this type may be unused in the end; this doesn't
+ mean that its contents may be unused as well, but only the container. */
- DEBUG_INFO_P, if true, means that we need to write debug information for
- types that we may create in the process. */
static void
components_to_record (tree gnu_record_type, Node_Id gnat_component_list,
tree gnu_field_list, int packed, bool definition,
tree *p_gnu_rep_list, bool cancel_alignment,
- bool all_rep, bool do_not_finalize,
- bool unchecked_union, bool debug_info_p)
+ bool all_rep, bool unchecked_union, bool debug_info_p,
+ bool maybe_unused)
{
bool all_rep_and_size = all_rep && TYPE_SIZE (gnu_record_type);
bool layout_with_rep = false;
= TYPE_SIZE_UNIT (gnu_record_type);
}
- /* Add the fields into the record type for the variant. Note that we
- defer finalizing it until after we are sure to really use it. */
+ /* Add the fields into the record type for the variant. Note that
+ we aren't sure to really use it at this point, see below. */
components_to_record (gnu_variant_type, Component_List (variant),
NULL_TREE, packed, definition,
&gnu_our_rep_list, !all_rep_and_size, all_rep,
- true, unchecked_union, debug_info_p);
+ unchecked_union, debug_info_p, true);
gnu_qual = choices_to_gnu (gnu_discr, Discrete_Choices (variant));
}
finish_record_type (gnu_union_type, nreverse (gnu_variant_list),
- all_rep_and_size ? 1 : 0, false);
+ all_rep_and_size ? 1 : 0, debug_info_p);
/* If GNU_UNION_TYPE is our record type, it means we must have an
Unchecked_Union with no fields. Verify that and, if so, just
if (gnu_field_list)
{
- finish_record_type (gnu_rep_type, gnu_our_rep_list, 1, false);
+ finish_record_type (gnu_rep_type, gnu_our_rep_list, 1, debug_info_p);
gnu_field
= create_field_decl (get_identifier ("REP"), gnu_rep_type,
gnu_record_type, 0, NULL_TREE, NULL_TREE, 1);
TYPE_ALIGN (gnu_record_type) = 0;
finish_record_type (gnu_record_type, nreverse (gnu_field_list),
- layout_with_rep ? 1 : 0, do_not_finalize);
+ layout_with_rep ? 1 : 0, debug_info_p && !maybe_unused);
}
\f
/* Given GNU_SIZE, a GCC tree representing a size, return a Uint to be
UI_From_Int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT));
}
-/* Return first element of field list whose TREE_PURPOSE is ELEM or whose
- DECL_ORIGINAL_FIELD of TREE_PURPOSE is ELEM. Return NULL_TREE if there
- is no such element in the list. */
+/* Return first element of field list whose TREE_PURPOSE is the same as ELEM.
+ Return NULL_TREE if there is no such element in the list. */
static tree
purpose_member_field (const_tree elem, tree list)
while (list)
{
tree field = TREE_PURPOSE (list);
- if (elem == field || elem == DECL_ORIGINAL_FIELD (field))
+ if (SAME_FIELD_P (field, elem))
return list;
list = TREE_CHAIN (list);
}
}
DECL_INTERNAL_P (new_field) = DECL_INTERNAL_P (old_field);
- t = DECL_ORIGINAL_FIELD (old_field);
- SET_DECL_ORIGINAL_FIELD (new_field, t ? t : old_field);
+ SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, old_field);
DECL_DISCRIMINANT_NUMBER (new_field) = DECL_DISCRIMINANT_NUMBER (old_field);
TREE_THIS_VOLATILE (new_field) = TREE_THIS_VOLATILE (old_field);
field_list = new_variant_subpart;
}
- /* Finish up the new variant and create the field. */
- finish_record_type (new_variant, nreverse (field_list), 2, true);
+ /* Finish up the new variant and create the field. No need for debug
+ info thanks to the XVS type. */
+ finish_record_type (new_variant, nreverse (field_list), 2, false);
compute_record_mode (new_variant);
- rest_of_record_type_compilation (new_variant);
-
- /* No need for debug info thanks to the XVS type. */
create_type_decl (TYPE_NAME (new_variant), new_variant, NULL,
true, false, Empty);
union_field_list = new_field;
}
- /* Finish up the union type and create the variant part. */
- finish_record_type (new_union_type, union_field_list, 2, true);
+ /* Finish up the union type and create the variant part. No need for debug
+ info thanks to the XVS type. */
+ finish_record_type (new_union_type, union_field_list, 2, false);
compute_record_mode (new_union_type);
- rest_of_record_type_compilation (new_union_type);
-
- /* No need for debug info thanks to the XVS type. */
create_type_decl (TYPE_NAME (new_union_type), new_union_type, NULL,
true, false, Empty);
}
DECL_CONTEXT (new_field) = nt;
- SET_DECL_ORIGINAL_FIELD (new_field,
- (DECL_ORIGINAL_FIELD (field)
- ? DECL_ORIGINAL_FIELD (field) : field));
+ SET_DECL_ORIGINAL_FIELD_TO_FIELD (new_field, field);
TREE_CHAIN (new_field) = TYPE_FIELDS (nt);
TYPE_FIELDS (nt) = new_field;
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