* *
* C Implementation File *
* *
- * Copyright (C) 1992-2004, Free Software Foundation, Inc. *
+ * Copyright (C) 1992-2007, 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- *
* 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 distributed with GNAT; see file COPYING. If not, write *
- * to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, *
- * MA 02111-1307, USA. *
+ * to the Free Software Foundation, 51 Franklin Street, Fifth Floor, *
+ * Boston, MA 02110-1301, USA. *
* *
* GNAT was originally developed by the GNAT team at New York University. *
* Extensive contributions were provided by Ada Core Technologies Inc. *
#include "tree.h"
#include "real.h"
#include "flags.h"
+#include "toplev.h"
#include "rtl.h"
#include "expr.h"
#include "ggc.h"
+#include "cgraph.h"
#include "function.h"
#include "except.h"
#include "debug.h"
#include "output.h"
+#include "tree-gimple.h"
#include "ada.h"
#include "types.h"
#include "atree.h"
#include "ada-tree.h"
#include "gigi.h"
+/* Let code below know whether we are targetting VMS without need of
+ intrusive preprocessor directives. */
+#ifndef TARGET_ABI_OPEN_VMS
+#define TARGET_ABI_OPEN_VMS 0
+#endif
+
int max_gnat_nodes;
int number_names;
struct Node *Nodes_Ptr;
Char_Code *String_Chars_Ptr;
struct List_Header *List_Headers_Ptr;
-/* Current filename without path. */
-const char *ref_filename;
+/* Current filename without path. */
+const char *ref_filename;
+
+/* If true, then gigi is being called on an analyzed but unexpanded
+ tree, and the only purpose of the call is to properly annotate
+ types with representation information. */
+bool type_annotate_only;
+
+/* When not optimizing, we cache the 'First, 'Last and 'Length attributes
+ of unconstrained array IN parameters to avoid emitting a great deal of
+ redundant instructions to recompute them each time. */
+struct parm_attr GTY (())
+{
+ int id; /* GTY doesn't like Entity_Id. */
+ int dim;
+ tree first;
+ tree last;
+ tree length;
+};
+
+typedef struct parm_attr *parm_attr;
+
+DEF_VEC_P(parm_attr);
+DEF_VEC_ALLOC_P(parm_attr,gc);
+
+struct language_function GTY(())
+{
+/* We should avoid allocating more than ALLOCA_THRESHOLD bytes via alloca, for
+ fear of running out of stack space. If we need more, we use xmalloc/free
+ instead. */
+#define ALLOCA_THRESHOLD 1000
+
+ VEC(parm_attr,gc) *parm_attr_cache;
+};
+
+#define f_parm_attr_cache \
+ DECL_STRUCT_FUNCTION (current_function_decl)->language->parm_attr_cache
+
+/* A structure used to gather together information about a statement group.
+ We use this to gather related statements, for example the "then" part
+ of a IF. In the case where it represents a lexical scope, we may also
+ have a BLOCK node corresponding to it and/or cleanups. */
+
+struct stmt_group GTY((chain_next ("%h.previous"))) {
+ struct stmt_group *previous; /* Previous code group. */
+ tree stmt_list; /* List of statements for this code group. */
+ tree block; /* BLOCK for this code group, if any. */
+ tree cleanups; /* Cleanups for this code group, if any. */
+};
+
+static GTY(()) struct stmt_group *current_stmt_group;
+
+/* List of unused struct stmt_group nodes. */
+static GTY((deletable)) struct stmt_group *stmt_group_free_list;
+
+/* A structure used to record information on elaboration procedures
+ we've made and need to process.
+
+ ??? gnat_node should be Node_Id, but gengtype gets confused. */
+
+struct elab_info GTY((chain_next ("%h.next"))) {
+ struct elab_info *next; /* Pointer to next in chain. */
+ tree elab_proc; /* Elaboration procedure. */
+ int gnat_node; /* The N_Compilation_Unit. */
+};
+
+static GTY(()) struct elab_info *elab_info_list;
+
+/* Free list of TREE_LIST nodes used for stacks. */
+static GTY((deletable)) tree gnu_stack_free_list;
+
+/* List of TREE_LIST nodes representing a stack of exception pointer
+ variables. TREE_VALUE is the VAR_DECL that stores the address of
+ the raised exception. Nonzero means we are in an exception
+ handler. Not used in the zero-cost case. */
+static GTY(()) tree gnu_except_ptr_stack;
+
+/* List of TREE_LIST nodes used to store the current elaboration procedure
+ decl. TREE_VALUE is the decl. */
+static GTY(()) tree gnu_elab_proc_stack;
+
+/* Variable that stores a list of labels to be used as a goto target instead of
+ a return in some functions. See processing for N_Subprogram_Body. */
+static GTY(()) tree gnu_return_label_stack;
+
+/* List of TREE_LIST nodes representing a stack of LOOP_STMT nodes.
+ TREE_VALUE of each entry is the label of the corresponding LOOP_STMT. */
+static GTY(()) tree gnu_loop_label_stack;
+
+/* List of TREE_LIST nodes representing labels for switch statements.
+ TREE_VALUE of each entry is the label at the end of the switch. */
+static GTY(()) tree gnu_switch_label_stack;
+
+/* List of TREE_LIST nodes containing the stacks for N_{Push,Pop}_*_Label. */
+static GTY(()) tree gnu_constraint_error_label_stack;
+static GTY(()) tree gnu_storage_error_label_stack;
+static GTY(()) tree gnu_program_error_label_stack;
+
+/* Map GNAT tree codes to GCC tree codes for simple expressions. */
+static enum tree_code gnu_codes[Number_Node_Kinds];
+
+/* Current node being treated, in case abort called. */
+Node_Id error_gnat_node;
+
+static void Compilation_Unit_to_gnu (Node_Id);
+static void record_code_position (Node_Id);
+static void insert_code_for (Node_Id);
+static void add_cleanup (tree, Node_Id);
+static tree mark_visited (tree *, int *, void *);
+static tree unshare_save_expr (tree *, int *, void *);
+static void add_stmt_list (List_Id);
+static void push_exception_label_stack (tree *, Entity_Id);
+static tree build_stmt_group (List_Id, bool);
+static void push_stack (tree *, tree, tree);
+static void pop_stack (tree *);
+static enum gimplify_status gnat_gimplify_stmt (tree *);
+static void elaborate_all_entities (Node_Id);
+static void process_freeze_entity (Node_Id);
+static void process_inlined_subprograms (Node_Id);
+static void process_decls (List_Id, List_Id, Node_Id, bool, bool);
+static tree emit_range_check (tree, Node_Id);
+static tree emit_index_check (tree, tree, tree, tree);
+static tree emit_check (tree, tree, int);
+static tree convert_with_check (Entity_Id, tree, bool, bool, bool);
+static bool addressable_p (tree);
+static tree assoc_to_constructor (Entity_Id, Node_Id, tree);
+static tree extract_values (tree, tree);
+static tree pos_to_constructor (Node_Id, tree, Entity_Id);
+static tree maybe_implicit_deref (tree);
+static tree gnat_stabilize_reference (tree, bool);
+static tree gnat_stabilize_reference_1 (tree, bool);
+static void annotate_with_node (tree, Node_Id);
+static int lvalue_required_p (Node_Id, tree, int);
+\f
+/* This is the main program of the back-end. It sets up all the table
+ structures and then generates code. */
+
+void
+gigi (Node_Id gnat_root, int max_gnat_node, int number_name,
+ struct Node *nodes_ptr, Node_Id *next_node_ptr, Node_Id *prev_node_ptr,
+ struct Elist_Header *elists_ptr, struct Elmt_Item *elmts_ptr,
+ struct String_Entry *strings_ptr, Char_Code *string_chars_ptr,
+ struct List_Header *list_headers_ptr, Int number_units ATTRIBUTE_UNUSED,
+ char *file_info_ptr ATTRIBUTE_UNUSED, Entity_Id standard_integer,
+ Entity_Id standard_long_long_float, Entity_Id standard_exception_type,
+ Int gigi_operating_mode)
+{
+ tree gnu_standard_long_long_float;
+ tree gnu_standard_exception_type;
+ struct elab_info *info;
+
+ max_gnat_nodes = max_gnat_node;
+ number_names = number_name;
+ Nodes_Ptr = nodes_ptr;
+ Next_Node_Ptr = next_node_ptr;
+ Prev_Node_Ptr = prev_node_ptr;
+ Elists_Ptr = elists_ptr;
+ Elmts_Ptr = elmts_ptr;
+ Strings_Ptr = strings_ptr;
+ String_Chars_Ptr = string_chars_ptr;
+ List_Headers_Ptr = list_headers_ptr;
+
+ type_annotate_only = (gigi_operating_mode == 1);
+
+ init_gnat_to_gnu ();
+ gnat_compute_largest_alignment ();
+ init_dummy_type ();
+
+ /* If we are just annotating types, give VOID_TYPE zero sizes to avoid
+ errors. */
+ if (type_annotate_only)
+ {
+ TYPE_SIZE (void_type_node) = bitsize_zero_node;
+ TYPE_SIZE_UNIT (void_type_node) = size_zero_node;
+ }
+
+ /* Save the type we made for integer as the type for Standard.Integer.
+ Then make the rest of the standard types. Note that some of these
+ may be subtypes. */
+ save_gnu_tree (Base_Type (standard_integer), TYPE_NAME (integer_type_node),
+ false);
+
+ gnu_except_ptr_stack = tree_cons (NULL_TREE, NULL_TREE, NULL_TREE);
+ gnu_constraint_error_label_stack
+ = tree_cons (NULL_TREE, NULL_TREE, NULL_TREE);
+ gnu_storage_error_label_stack = tree_cons (NULL_TREE, NULL_TREE, NULL_TREE);
+ gnu_program_error_label_stack = tree_cons (NULL_TREE, NULL_TREE, NULL_TREE);
+
+ gnu_standard_long_long_float
+ = gnat_to_gnu_entity (Base_Type (standard_long_long_float), NULL_TREE, 0);
+ gnu_standard_exception_type
+ = gnat_to_gnu_entity (Base_Type (standard_exception_type), NULL_TREE, 0);
+
+ init_gigi_decls (gnu_standard_long_long_float, gnu_standard_exception_type);
+
+ /* Process any Pragma Ident for the main unit. */
+#ifdef ASM_OUTPUT_IDENT
+ if (Present (Ident_String (Main_Unit)))
+ ASM_OUTPUT_IDENT
+ (asm_out_file,
+ TREE_STRING_POINTER (gnat_to_gnu (Ident_String (Main_Unit))));
+#endif
+
+ /* If we are using the GCC exception mechanism, let GCC know. */
+ if (Exception_Mechanism == Back_End_Exceptions)
+ gnat_init_gcc_eh ();
+
+ gcc_assert (Nkind (gnat_root) == N_Compilation_Unit);
+ Compilation_Unit_to_gnu (gnat_root);
+
+ /* Now see if we have any elaboration procedures to deal with. */
+ for (info = elab_info_list; info; info = info->next)
+ {
+ tree gnu_body = DECL_SAVED_TREE (info->elab_proc);
+ tree gnu_stmts;
+
+ /* Unshare SAVE_EXPRs between subprograms. These are not unshared by
+ the gimplifier for obvious reasons, but it turns out that we need to
+ unshare them for the global level because of SAVE_EXPRs made around
+ checks for global objects and around allocators for global objects
+ of variable size, in order to prevent node sharing in the underlying
+ expression. Note that this implicitly assumes that the SAVE_EXPR
+ nodes themselves are not shared between subprograms, which would be
+ an upstream bug for which we would not change the outcome. */
+ walk_tree_without_duplicates (&gnu_body, unshare_save_expr, NULL);
+
+ /* Set the current function to be the elaboration procedure and gimplify
+ what we have. */
+ current_function_decl = info->elab_proc;
+ gimplify_body (&gnu_body, info->elab_proc, true);
+
+ /* We should have a BIND_EXPR, but it may or may not have any statements
+ in it. If it doesn't have any, we have nothing to do. */
+ gnu_stmts = gnu_body;
+ if (TREE_CODE (gnu_stmts) == BIND_EXPR)
+ gnu_stmts = BIND_EXPR_BODY (gnu_stmts);
+
+ /* If there are no statements, there is no elaboration code. */
+ if (!gnu_stmts || !STATEMENT_LIST_HEAD (gnu_stmts))
+ {
+ Set_Has_No_Elaboration_Code (info->gnat_node, 1);
+ cgraph_remove_node (cgraph_node (info->elab_proc));
+ }
+ else
+ {
+ /* Otherwise, compile the function. Note that we'll be gimplifying
+ it twice, but that's fine for the nodes we use. */
+ begin_subprog_body (info->elab_proc);
+ end_subprog_body (gnu_body);
+ }
+ }
+
+ /* We cannot track the location of errors past this point. */
+ error_gnat_node = Empty;
+}
+\f
+/* Perform initializations for this module. */
+
+void
+gnat_init_stmt_group (void)
+{
+ /* Initialize ourselves. */
+ init_code_table ();
+ start_stmt_group ();
+
+ /* Enable GNAT stack checking method if needed */
+ if (!Stack_Check_Probes_On_Target)
+ set_stack_check_libfunc (gen_rtx_SYMBOL_REF (Pmode, "_gnat_stack_check"));
+}
+\f
+/* Returns a positive value if GNAT_NODE requires an lvalue for an
+ operand of OPERAND_TYPE, whose aliasing is specified by ALIASED,
+ zero otherwise. This is int instead of bool to facilitate usage
+ in non purely binary logic contexts. */
+
+static int
+lvalue_required_p (Node_Id gnat_node, tree operand_type, int aliased)
+{
+ switch (Nkind (gnat_node))
+ {
+ case N_Reference:
+ return 1;
+
+ case N_Attribute_Reference:
+ {
+ unsigned char id = Get_Attribute_Id (Attribute_Name (gnat_node));
+ return id == Attr_Address
+ || id == Attr_Access
+ || id == Attr_Unchecked_Access
+ || id == Attr_Unrestricted_Access;
+ }
+
+ case N_Parameter_Association:
+ case N_Function_Call:
+ case N_Procedure_Call_Statement:
+ return must_pass_by_ref (operand_type)
+ || default_pass_by_ref (operand_type);
+
+ case N_Indexed_Component:
+ {
+ Node_Id gnat_temp;
+ /* ??? Consider that referencing an indexed component with a
+ non-constant index forces the whole aggregate to memory.
+ Note that N_Integer_Literal is conservative, any static
+ expression in the RM sense could probably be accepted. */
+ for (gnat_temp = First (Expressions (gnat_node));
+ Present (gnat_temp);
+ gnat_temp = Next (gnat_temp))
+ if (Nkind (gnat_temp) != N_Integer_Literal)
+ return 1;
+ aliased |= Has_Aliased_Components (Etype (Prefix (gnat_node)));
+ return lvalue_required_p (Parent (gnat_node), operand_type, aliased);
+ }
+
+ case N_Selected_Component:
+ aliased |= Is_Aliased (Entity (Selector_Name (gnat_node)));
+ return lvalue_required_p (Parent (gnat_node), operand_type, aliased);
+
+ case N_Object_Renaming_Declaration:
+ /* We need to make a real renaming only if the constant object is
+ aliased; otherwise we can optimize and return the rvalue. We
+ make an exception if the object is an identifier since in this
+ case the rvalue can be propagated attached to the CONST_DECL. */
+ return aliased || Nkind (Name (gnat_node)) == N_Identifier;
+
+ default:
+ return 0;
+ }
+
+ gcc_unreachable ();
+}
+
+/* Subroutine of gnat_to_gnu to translate gnat_node, an N_Identifier,
+ to a GCC tree, which is returned. GNU_RESULT_TYPE_P is a pointer to
+ where we should place the result type. */
+
+static tree
+Identifier_to_gnu (Node_Id gnat_node, tree *gnu_result_type_p)
+{
+ tree gnu_result_type;
+ tree gnu_result;
+ Node_Id gnat_temp, gnat_temp_type;
+
+ /* Whether the parent of gnat_node requires an lvalue. Needed in
+ specific circumstances only, so evaluated lazily. < 0 means unknown,
+ > 0 means known true, 0 means known false. */
+ int parent_requires_lvalue = -1;
+
+ /* If GNAT_NODE is a constant, whether we should use the initialization
+ value instead of the constant entity, typically for scalars with an
+ address clause when the parent doesn't require an lvalue. */
+ bool use_constant_initializer = false;
+
+ /* If the Etype of this node does not equal the Etype of the Entity,
+ something is wrong with the entity map, probably in generic
+ instantiation. However, this does not apply to types. Since we sometime
+ have strange Ekind's, just do this test for objects. Also, if the Etype of
+ the Entity is private, the Etype of the N_Identifier is allowed to be the
+ full type and also we consider a packed array type to be the same as the
+ original type. Similarly, a class-wide type is equivalent to a subtype of
+ itself. Finally, if the types are Itypes, one may be a copy of the other,
+ which is also legal. */
+ gnat_temp = (Nkind (gnat_node) == N_Defining_Identifier
+ ? gnat_node : Entity (gnat_node));
+ gnat_temp_type = Etype (gnat_temp);
+
+ gcc_assert (Etype (gnat_node) == gnat_temp_type
+ || (Is_Packed (gnat_temp_type)
+ && Etype (gnat_node) == Packed_Array_Type (gnat_temp_type))
+ || (Is_Class_Wide_Type (Etype (gnat_node)))
+ || (IN (Ekind (gnat_temp_type), Private_Kind)
+ && Present (Full_View (gnat_temp_type))
+ && ((Etype (gnat_node) == Full_View (gnat_temp_type))
+ || (Is_Packed (Full_View (gnat_temp_type))
+ && (Etype (gnat_node)
+ == Packed_Array_Type (Full_View
+ (gnat_temp_type))))))
+ || (Is_Itype (Etype (gnat_node)) && Is_Itype (gnat_temp_type))
+ || !(Ekind (gnat_temp) == E_Variable
+ || Ekind (gnat_temp) == E_Component
+ || Ekind (gnat_temp) == E_Constant
+ || Ekind (gnat_temp) == E_Loop_Parameter
+ || IN (Ekind (gnat_temp), Formal_Kind)));
+
+ /* If this is a reference to a deferred constant whose partial view is an
+ unconstrained private type, the proper type is on the full view of the
+ constant, not on the full view of the type, which may be unconstrained.
+
+ This may be a reference to a type, for example in the prefix of the
+ attribute Position, generated for dispatching code (see Make_DT in
+ exp_disp,adb). In that case we need the type itself, not is parent,
+ in particular if it is a derived type */
+ if (Is_Private_Type (gnat_temp_type)
+ && Has_Unknown_Discriminants (gnat_temp_type)
+ && Ekind (gnat_temp) == E_Constant
+ && Present (Full_View (gnat_temp)))
+ {
+ gnat_temp = Full_View (gnat_temp);
+ gnat_temp_type = Etype (gnat_temp);
+ }
+ else
+ {
+ /* We want to use the Actual_Subtype if it has already been elaborated,
+ otherwise the Etype. Avoid using Actual_Subtype for packed arrays to
+ simplify things. */
+ if ((Ekind (gnat_temp) == E_Constant
+ || Ekind (gnat_temp) == E_Variable || Is_Formal (gnat_temp))
+ && !(Is_Array_Type (Etype (gnat_temp))
+ && Present (Packed_Array_Type (Etype (gnat_temp))))
+ && Present (Actual_Subtype (gnat_temp))
+ && present_gnu_tree (Actual_Subtype (gnat_temp)))
+ gnat_temp_type = Actual_Subtype (gnat_temp);
+ else
+ gnat_temp_type = Etype (gnat_node);
+ }
+
+ /* Expand the type of this identifier first, in case it is an enumeral
+ literal, which only get made when the type is expanded. There is no
+ order-of-elaboration issue here. */
+ gnu_result_type = get_unpadded_type (gnat_temp_type);
+
+ /* If this is a non-imported scalar constant with an address clause,
+ retrieve the value instead of a pointer to be dereferenced unless the
+ parent requires an lvalue. This is generally more efficient and
+ actually required if this is a static expression because it might be used
+ in a context where a dereference is inappropriate, such as a case
+ statement alternative or a record discriminant. There is no possible
+ volatile-ness shortciruit here since Volatile constants must be imported
+ per C.6. */
+ if (Ekind (gnat_temp) == E_Constant && Is_Scalar_Type (gnat_temp_type)
+ && !Is_Imported (gnat_temp)
+ && Present (Address_Clause (gnat_temp)))
+ {
+ parent_requires_lvalue
+ = lvalue_required_p (Parent (gnat_node), gnu_result_type,
+ Is_Aliased (gnat_temp));
+ use_constant_initializer = !parent_requires_lvalue;
+ }
+
+ if (use_constant_initializer)
+ {
+ /* If this is a deferred constant, the initializer is attached to the
+ the full view. */
+ if (Present (Full_View (gnat_temp)))
+ gnat_temp = Full_View (gnat_temp);
+
+ gnu_result = gnat_to_gnu (Expression (Declaration_Node (gnat_temp)));
+ }
+ else
+ gnu_result = gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0);
+
+ /* If we are in an exception handler, force this variable into memory to
+ ensure optimization does not remove stores that appear redundant but are
+ actually needed in case an exception occurs.
+
+ ??? Note that we need not do this if the variable is declared within the
+ handler, only if it is referenced in the handler and declared in an
+ enclosing block, but we have no way of testing that right now.
+
+ ??? We used to essentially set the TREE_ADDRESSABLE flag on the variable
+ here, but it can now be removed by the Tree aliasing machinery if the
+ address of the variable is never taken. All we can do is to make the
+ variable volatile, which might incur the generation of temporaries just
+ to access the memory in some circumstances. This can be avoided for
+ variables of non-constant size because they are automatically allocated
+ to memory. There might be no way of allocating a proper temporary for
+ them in any case. We only do this for SJLJ though. */
+ if (TREE_VALUE (gnu_except_ptr_stack)
+ && TREE_CODE (gnu_result) == VAR_DECL
+ && TREE_CODE (DECL_SIZE_UNIT (gnu_result)) == INTEGER_CST)
+ TREE_THIS_VOLATILE (gnu_result) = TREE_SIDE_EFFECTS (gnu_result) = 1;
+
+ /* Some objects (such as parameters passed by reference, globals of
+ variable size, and renamed objects) actually represent the address
+ of the object. In that case, we must do the dereference. Likewise,
+ deal with parameters to foreign convention subprograms. */
+ if (DECL_P (gnu_result)
+ && (DECL_BY_REF_P (gnu_result)
+ || (TREE_CODE (gnu_result) == PARM_DECL
+ && DECL_BY_COMPONENT_PTR_P (gnu_result))))
+ {
+ bool ro = DECL_POINTS_TO_READONLY_P (gnu_result);
+ tree renamed_obj;
+
+ if (TREE_CODE (gnu_result) == PARM_DECL
+ && DECL_BY_COMPONENT_PTR_P (gnu_result))
+ gnu_result
+ = build_unary_op (INDIRECT_REF, NULL_TREE,
+ convert (build_pointer_type (gnu_result_type),
+ gnu_result));
+
+ /* If it's a renaming pointer and we are at the right binding level,
+ we can reference the renamed object directly, since the renamed
+ expression has been protected against multiple evaluations. */
+ else if (TREE_CODE (gnu_result) == VAR_DECL
+ && (renamed_obj = DECL_RENAMED_OBJECT (gnu_result)) != 0
+ && (! DECL_RENAMING_GLOBAL_P (gnu_result)
+ || global_bindings_p ()))
+ gnu_result = renamed_obj;
+
+ /* Return the underlying CST for a CONST_DECL like a few lines below,
+ after dereferencing in this case. */
+ else if (TREE_CODE (gnu_result) == CONST_DECL)
+ gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE,
+ DECL_INITIAL (gnu_result));
+
+ else
+ gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_result);
+
+ TREE_READONLY (gnu_result) = TREE_STATIC (gnu_result) = ro;
+ }
+
+ /* The GNAT tree has the type of a function as the type of its result. Also
+ use the type of the result if the Etype is a subtype which is nominally
+ unconstrained. But remove any padding from the resulting type. */
+ if (TREE_CODE (TREE_TYPE (gnu_result)) == FUNCTION_TYPE
+ || Is_Constr_Subt_For_UN_Aliased (gnat_temp_type))
+ {
+ gnu_result_type = TREE_TYPE (gnu_result);
+ if (TREE_CODE (gnu_result_type) == RECORD_TYPE
+ && TYPE_IS_PADDING_P (gnu_result_type))
+ gnu_result_type = TREE_TYPE (TYPE_FIELDS (gnu_result_type));
+ }
+
+ /* If we have a constant declaration and its initializer at hand,
+ try to return the latter to avoid the need to call fold in lots
+ of places and the need of elaboration code if this Id is used as
+ an initializer itself. */
+ if (TREE_CONSTANT (gnu_result)
+ && DECL_P (gnu_result) && DECL_INITIAL (gnu_result))
+ {
+ tree object
+ = (TREE_CODE (gnu_result) == CONST_DECL
+ ? DECL_CONST_CORRESPONDING_VAR (gnu_result) : gnu_result);
+
+ /* If there is a corresponding variable, we only want to return the CST
+ value if the parent doesn't require an lvalue. Evaluate this now if
+ we have not already done so. */
+ if (object && parent_requires_lvalue < 0)
+ parent_requires_lvalue
+ = lvalue_required_p (Parent (gnat_node), gnu_result_type,
+ Is_Aliased (gnat_temp));
+
+ if (!object || !parent_requires_lvalue)
+ gnu_result = DECL_INITIAL (gnu_result);
+ }
+
+ *gnu_result_type_p = gnu_result_type;
+ return gnu_result;
+}
+\f
+/* Subroutine of gnat_to_gnu to process gnat_node, an N_Pragma. Return
+ any statements we generate. */
+
+static tree
+Pragma_to_gnu (Node_Id gnat_node)
+{
+ Node_Id gnat_temp;
+ tree gnu_result = alloc_stmt_list ();
+
+ /* Check for (and ignore) unrecognized pragma and do nothing if we are just
+ annotating types. */
+ if (type_annotate_only || !Is_Pragma_Name (Chars (gnat_node)))
+ return gnu_result;
+
+ switch (Get_Pragma_Id (Chars (gnat_node)))
+ {
+ case Pragma_Inspection_Point:
+ /* Do nothing at top level: all such variables are already viewable. */
+ if (global_bindings_p ())
+ break;
+
+ for (gnat_temp = First (Pragma_Argument_Associations (gnat_node));
+ Present (gnat_temp);
+ gnat_temp = Next (gnat_temp))
+ {
+ Node_Id gnat_expr = Expression (gnat_temp);
+ tree gnu_expr = gnat_to_gnu (gnat_expr);
+ int use_address;
+ enum machine_mode mode;
+ tree asm_constraint = NULL_TREE;
+#ifdef ASM_COMMENT_START
+ char *comment;
+#endif
+
+ if (TREE_CODE (gnu_expr) == UNCONSTRAINED_ARRAY_REF)
+ gnu_expr = TREE_OPERAND (gnu_expr, 0);
+
+ /* Use the value only if it fits into a normal register,
+ otherwise use the address. */
+ mode = TYPE_MODE (TREE_TYPE (gnu_expr));
+ use_address = ((GET_MODE_CLASS (mode) != MODE_INT
+ && GET_MODE_CLASS (mode) != MODE_PARTIAL_INT)
+ || GET_MODE_SIZE (mode) > UNITS_PER_WORD);
+
+ if (use_address)
+ gnu_expr = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr);
+
+#ifdef ASM_COMMENT_START
+ comment = concat (ASM_COMMENT_START,
+ " inspection point: ",
+ Get_Name_String (Chars (gnat_expr)),
+ use_address ? " address" : "",
+ " is in %0",
+ NULL);
+ asm_constraint = build_string (strlen (comment), comment);
+ free (comment);
+#endif
+ gnu_expr = build4 (ASM_EXPR, void_type_node,
+ asm_constraint,
+ NULL_TREE,
+ tree_cons
+ (build_tree_list (NULL_TREE,
+ build_string (1, "g")),
+ gnu_expr, NULL_TREE),
+ NULL_TREE);
+ ASM_VOLATILE_P (gnu_expr) = 1;
+ annotate_with_node (gnu_expr, gnat_node);
+ append_to_statement_list (gnu_expr, &gnu_result);
+ }
+ break;
+
+ case Pragma_Optimize:
+ switch (Chars (Expression
+ (First (Pragma_Argument_Associations (gnat_node)))))
+ {
+ case Name_Time: case Name_Space:
+ if (optimize == 0)
+ post_error ("insufficient -O value?", gnat_node);
+ break;
+
+ case Name_Off:
+ if (optimize != 0)
+ post_error ("must specify -O0?", gnat_node);
+ break;
+
+ default:
+ gcc_unreachable ();
+ }
+ break;
+
+ case Pragma_Reviewable:
+ if (write_symbols == NO_DEBUG)
+ post_error ("must specify -g?", gnat_node);
+ break;
+ }
+
+ return gnu_result;
+}
+/* Subroutine of gnat_to_gnu to translate gnat_node, an N_Attribute,
+ to a GCC tree, which is returned. GNU_RESULT_TYPE_P is a pointer to
+ where we should place the result type. ATTRIBUTE is the attribute ID. */
+
+static tree
+Attribute_to_gnu (Node_Id gnat_node, tree *gnu_result_type_p, int attribute)
+{
+ tree gnu_result = error_mark_node;
+ tree gnu_result_type;
+ tree gnu_expr;
+ bool prefix_unused = false;
+ tree gnu_prefix = gnat_to_gnu (Prefix (gnat_node));
+ tree gnu_type = TREE_TYPE (gnu_prefix);
+
+ /* If the input is a NULL_EXPR, make a new one. */
+ if (TREE_CODE (gnu_prefix) == NULL_EXPR)
+ {
+ *gnu_result_type_p = get_unpadded_type (Etype (gnat_node));
+ return build1 (NULL_EXPR, *gnu_result_type_p,
+ TREE_OPERAND (gnu_prefix, 0));
+ }
+
+ switch (attribute)
+ {
+ case Attr_Pos:
+ case Attr_Val:
+ /* These are just conversions until since representation clauses for
+ enumerations are handled in the front end. */
+ {
+ bool checkp = Do_Range_Check (First (Expressions (gnat_node)));
+
+ gnu_result = gnat_to_gnu (First (Expressions (gnat_node)));
+ gnu_result_type = get_unpadded_type (Etype (gnat_node));
+ gnu_result = convert_with_check (Etype (gnat_node), gnu_result,
+ checkp, checkp, true);
+ }
+ break;
+
+ case Attr_Pred:
+ case Attr_Succ:
+ /* These just add or subject the constant 1. Representation clauses for
+ enumerations are handled in the front-end. */
+ gnu_expr = gnat_to_gnu (First (Expressions (gnat_node)));
+ gnu_result_type = get_unpadded_type (Etype (gnat_node));
+
+ if (Do_Range_Check (First (Expressions (gnat_node))))
+ {
+ gnu_expr = protect_multiple_eval (gnu_expr);
+ gnu_expr
+ = emit_check
+ (build_binary_op (EQ_EXPR, integer_type_node,
+ gnu_expr,
+ attribute == Attr_Pred
+ ? TYPE_MIN_VALUE (gnu_result_type)
+ : TYPE_MAX_VALUE (gnu_result_type)),
+ gnu_expr, CE_Range_Check_Failed);
+ }
+
+ gnu_result
+ = build_binary_op (attribute == Attr_Pred
+ ? MINUS_EXPR : PLUS_EXPR,
+ gnu_result_type, gnu_expr,
+ convert (gnu_result_type, integer_one_node));
+ break;
+
+ case Attr_Address:
+ case Attr_Unrestricted_Access:
+ /* Conversions don't change something's address but can cause us to miss
+ the COMPONENT_REF case below, so strip them off. */
+ gnu_prefix = remove_conversions (gnu_prefix,
+ !Must_Be_Byte_Aligned (gnat_node));
+
+ /* If we are taking 'Address of an unconstrained object, this is the
+ pointer to the underlying array. */
+ if (attribute == Attr_Address)
+ gnu_prefix = maybe_unconstrained_array (gnu_prefix);
+
+ /* ... fall through ... */
+
+ case Attr_Access:
+ case Attr_Unchecked_Access:
+ case Attr_Code_Address:
+ gnu_result_type = get_unpadded_type (Etype (gnat_node));
+ gnu_result
+ = build_unary_op (((attribute == Attr_Address
+ || attribute == Attr_Unrestricted_Access)
+ && !Must_Be_Byte_Aligned (gnat_node))
+ ? ATTR_ADDR_EXPR : ADDR_EXPR,
+ gnu_result_type, gnu_prefix);
+
+ /* For 'Code_Address, find an inner ADDR_EXPR and mark it so that we
+ don't try to build a trampoline. */
+ if (attribute == Attr_Code_Address)
+ {
+ for (gnu_expr = gnu_result;
+ TREE_CODE (gnu_expr) == NOP_EXPR
+ || TREE_CODE (gnu_expr) == CONVERT_EXPR;
+ gnu_expr = TREE_OPERAND (gnu_expr, 0))
+ TREE_CONSTANT (gnu_expr) = 1;
+
+ if (TREE_CODE (gnu_expr) == ADDR_EXPR)
+ TREE_STATIC (gnu_expr) = TREE_CONSTANT (gnu_expr) = 1;
+ }
+ break;
+
+ case Attr_Pool_Address:
+ {
+ tree gnu_obj_type;
+ tree gnu_ptr = gnu_prefix;
+
+ gnu_result_type = get_unpadded_type (Etype (gnat_node));
+
+ /* If this is an unconstrained array, we know the object must have been
+ allocated with the template in front of the object. So compute the
+ template address.*/
+ if (TYPE_FAT_POINTER_P (TREE_TYPE (gnu_ptr)))
+ gnu_ptr
+ = convert (build_pointer_type
+ (TYPE_OBJECT_RECORD_TYPE
+ (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (gnu_ptr)))),
+ gnu_ptr);
+
+ gnu_obj_type = TREE_TYPE (TREE_TYPE (gnu_ptr));
+ if (TREE_CODE (gnu_obj_type) == RECORD_TYPE
+ && TYPE_CONTAINS_TEMPLATE_P (gnu_obj_type))
+ {
+ tree gnu_char_ptr_type = build_pointer_type (char_type_node);
+ tree gnu_pos = byte_position (TYPE_FIELDS (gnu_obj_type));
+ tree gnu_byte_offset
+ = convert (sizetype,
+ size_diffop (size_zero_node, gnu_pos));
+ gnu_byte_offset = fold_build1 (NEGATE_EXPR, sizetype, gnu_byte_offset);
+
+ gnu_ptr = convert (gnu_char_ptr_type, gnu_ptr);
+ gnu_ptr = build_binary_op (POINTER_PLUS_EXPR, gnu_char_ptr_type,
+ gnu_ptr, gnu_byte_offset);
+ }
+
+ gnu_result = convert (gnu_result_type, gnu_ptr);
+ }
+ break;
+
+ case Attr_Size:
+ case Attr_Object_Size:
+ case Attr_Value_Size:
+ case Attr_Max_Size_In_Storage_Elements:
+ gnu_expr = gnu_prefix;
+
+ /* Remove NOPS from gnu_expr and conversions from gnu_prefix.
+ We only use GNU_EXPR to see if a COMPONENT_REF was involved. */
+ while (TREE_CODE (gnu_expr) == NOP_EXPR)
+ gnu_expr = TREE_OPERAND (gnu_expr, 0)
+ ;
+
+ gnu_prefix = remove_conversions (gnu_prefix, true);
+ prefix_unused = true;
+ gnu_type = TREE_TYPE (gnu_prefix);
+
+ /* Replace an unconstrained array type with the type of the underlying
+ array. We can't do this with a call to maybe_unconstrained_array
+ since we may have a TYPE_DECL. For 'Max_Size_In_Storage_Elements,
+ use the record type that will be used to allocate the object and its
+ template. */
+ if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
+ {
+ gnu_type = TYPE_OBJECT_RECORD_TYPE (gnu_type);
+ if (attribute != Attr_Max_Size_In_Storage_Elements)
+ gnu_type = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)));
+ }
+
+ /* If we're looking for the size of a field, return the field size.
+ Otherwise, if the prefix is an object, or if 'Object_Size or
+ 'Max_Size_In_Storage_Elements has been specified, the result is the
+ GCC size of the type. Otherwise, the result is the RM_Size of the
+ type. */
+ if (TREE_CODE (gnu_prefix) == COMPONENT_REF)
+ gnu_result = DECL_SIZE (TREE_OPERAND (gnu_prefix, 1));
+ else if (TREE_CODE (gnu_prefix) != TYPE_DECL
+ || attribute == Attr_Object_Size
+ || attribute == Attr_Max_Size_In_Storage_Elements)
+ {
+ /* If this is a padded type, the GCC size isn't relevant to the
+ programmer. Normally, what we want is the RM_Size, which was set
+ from the specified size, but if it was not set, we want the size
+ of the relevant field. Using the MAX of those two produces the
+ right result in all case. Don't use the size of the field if it's
+ a self-referential type, since that's never what's wanted. */
+ if (TREE_CODE (gnu_type) == RECORD_TYPE
+ && TYPE_IS_PADDING_P (gnu_type)
+ && TREE_CODE (gnu_expr) == COMPONENT_REF)
+ {
+ gnu_result = rm_size (gnu_type);
+ if (!(CONTAINS_PLACEHOLDER_P
+ (DECL_SIZE (TREE_OPERAND (gnu_expr, 1)))))
+ gnu_result
+ = size_binop (MAX_EXPR, gnu_result,
+ DECL_SIZE (TREE_OPERAND (gnu_expr, 1)));
+ }
+ else if (Nkind (Prefix (gnat_node)) == N_Explicit_Dereference)
+ {
+ Node_Id gnat_deref = Prefix (gnat_node);
+ Node_Id gnat_actual_subtype = Actual_Designated_Subtype (gnat_deref);
+ tree gnu_ptr_type = TREE_TYPE (gnat_to_gnu (Prefix (gnat_deref)));
+ if (TYPE_FAT_OR_THIN_POINTER_P (gnu_ptr_type)
+ && Present (gnat_actual_subtype))
+ {
+ tree gnu_actual_obj_type = gnat_to_gnu_type (gnat_actual_subtype);
+ gnu_type = build_unc_object_type_from_ptr (gnu_ptr_type,
+ gnu_actual_obj_type, get_identifier ("SIZE"));
+ }
+
+ gnu_result = TYPE_SIZE (gnu_type);
+ }
+ else
+ gnu_result = TYPE_SIZE (gnu_type);
+ }
+ else
+ gnu_result = rm_size (gnu_type);
+
+ gcc_assert (gnu_result);
+
+ /* Deal with a self-referential size by returning the maximum size for a
+ type and by qualifying the size with the object for 'Size of an
+ object. */
+ if (CONTAINS_PLACEHOLDER_P (gnu_result))
+ {
+ if (TREE_CODE (gnu_prefix) != TYPE_DECL)
+ gnu_result = substitute_placeholder_in_expr (gnu_result, gnu_expr);
+ else
+ gnu_result = max_size (gnu_result, true);
+ }
+
+ /* If the type contains a template, subtract its size. */
+ if (TREE_CODE (gnu_type) == RECORD_TYPE
+ && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
+ gnu_result = size_binop (MINUS_EXPR, gnu_result,
+ DECL_SIZE (TYPE_FIELDS (gnu_type)));
+
+ gnu_result_type = get_unpadded_type (Etype (gnat_node));
+
+ /* Always perform division using unsigned arithmetic as the size cannot
+ be negative, but may be an overflowed positive value. This provides
+ correct results for sizes up to 512 MB.
+
+ ??? Size should be calculated in storage elements directly. */
+
+ if (attribute == Attr_Max_Size_In_Storage_Elements)
+ gnu_result = convert (sizetype,
+ fold_build2 (CEIL_DIV_EXPR, bitsizetype,
+ gnu_result, bitsize_unit_node));
+ break;
+
+ case Attr_Alignment:
+ if (TREE_CODE (gnu_prefix) == COMPONENT_REF
+ && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))
+ == RECORD_TYPE)
+ && (TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))))
+ gnu_prefix = TREE_OPERAND (gnu_prefix, 0);
+
+ gnu_type = TREE_TYPE (gnu_prefix);
+ gnu_result_type = get_unpadded_type (Etype (gnat_node));
+ prefix_unused = true;
+
+ gnu_result = size_int ((TREE_CODE (gnu_prefix) == COMPONENT_REF
+ ? DECL_ALIGN (TREE_OPERAND (gnu_prefix, 1))
+ : TYPE_ALIGN (gnu_type)) / BITS_PER_UNIT);
+ break;
+
+ case Attr_First:
+ case Attr_Last:
+ case Attr_Range_Length:
+ prefix_unused = true;
+
+ if (INTEGRAL_TYPE_P (gnu_type) || TREE_CODE (gnu_type) == REAL_TYPE)
+ {
+ gnu_result_type = get_unpadded_type (Etype (gnat_node));
+
+ if (attribute == Attr_First)
+ gnu_result = TYPE_MIN_VALUE (gnu_type);
+ else if (attribute == Attr_Last)
+ gnu_result = TYPE_MAX_VALUE (gnu_type);
+ else
+ gnu_result
+ = build_binary_op
+ (MAX_EXPR, get_base_type (gnu_result_type),
+ build_binary_op
+ (PLUS_EXPR, get_base_type (gnu_result_type),
+ build_binary_op (MINUS_EXPR,
+ get_base_type (gnu_result_type),
+ convert (gnu_result_type,
+ TYPE_MAX_VALUE (gnu_type)),
+ convert (gnu_result_type,
+ TYPE_MIN_VALUE (gnu_type))),
+ convert (gnu_result_type, integer_one_node)),
+ convert (gnu_result_type, integer_zero_node));
+
+ break;
+ }
+
+ /* ... fall through ... */
+
+ case Attr_Length:
+ {
+ int Dimension = (Present (Expressions (gnat_node))
+ ? UI_To_Int (Intval (First (Expressions (gnat_node))))
+ : 1), i;
+ struct parm_attr *pa = NULL;
+ Entity_Id gnat_param = Empty;
+
+ /* Make sure any implicit dereference gets done. */
+ gnu_prefix = maybe_implicit_deref (gnu_prefix);
+ gnu_prefix = maybe_unconstrained_array (gnu_prefix);
+ /* We treat unconstrained array IN parameters specially. */
+ if (Nkind (Prefix (gnat_node)) == N_Identifier
+ && !Is_Constrained (Etype (Prefix (gnat_node)))
+ && Ekind (Entity (Prefix (gnat_node))) == E_In_Parameter)
+ gnat_param = Entity (Prefix (gnat_node));
+ gnu_type = TREE_TYPE (gnu_prefix);
+ prefix_unused = true;
+ gnu_result_type = get_unpadded_type (Etype (gnat_node));
+
+ if (TYPE_CONVENTION_FORTRAN_P (gnu_type))
+ {
+ int ndim;
+ tree gnu_type_temp;
+
+ for (ndim = 1, gnu_type_temp = gnu_type;
+ TREE_CODE (TREE_TYPE (gnu_type_temp)) == ARRAY_TYPE
+ && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type_temp));
+ ndim++, gnu_type_temp = TREE_TYPE (gnu_type_temp))
+ ;
+
+ Dimension = ndim + 1 - Dimension;
+ }
+
+ for (i = 1; i < Dimension; i++)
+ gnu_type = TREE_TYPE (gnu_type);
+
+ gcc_assert (TREE_CODE (gnu_type) == ARRAY_TYPE);
+
+ /* When not optimizing, look up the slot associated with the parameter
+ and the dimension in the cache and create a new one on failure. */
+ if (!optimize && Present (gnat_param))
+ {
+ for (i = 0; VEC_iterate (parm_attr, f_parm_attr_cache, i, pa); i++)
+ if (pa->id == gnat_param && pa->dim == Dimension)
+ break;
+
+ if (!pa)
+ {
+ pa = GGC_CNEW (struct parm_attr);
+ pa->id = gnat_param;
+ pa->dim = Dimension;
+ VEC_safe_push (parm_attr, gc, f_parm_attr_cache, pa);
+ }
+ }
+
+ /* Return the cached expression or build a new one. */
+ if (attribute == Attr_First)
+ {
+ if (pa && pa->first)
+ {
+ gnu_result = pa->first;
+ break;
+ }
+
+ gnu_result
+ = TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type)));
+ }
+
+ else if (attribute == Attr_Last)
+ {
+ if (pa && pa->last)
+ {
+ gnu_result = pa->last;
+ break;
+ }
+
+ gnu_result
+ = TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type)));
+ }
+
+ else /* attribute == Attr_Range_Length || attribute == Attr_Length */
+ {
+ tree gnu_compute_type;
+
+ if (pa && pa->length)
+ {
+ gnu_result = pa->length;
+ break;
+ }
+
+ gnu_compute_type
+ = signed_or_unsigned_type_for (0,
+ get_base_type (gnu_result_type));
+
+ gnu_result
+ = build_binary_op
+ (MAX_EXPR, gnu_compute_type,
+ build_binary_op
+ (PLUS_EXPR, gnu_compute_type,
+ build_binary_op
+ (MINUS_EXPR, gnu_compute_type,
+ convert (gnu_compute_type,
+ TYPE_MAX_VALUE
+ (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type)))),
+ convert (gnu_compute_type,
+ TYPE_MIN_VALUE
+ (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))))),
+ convert (gnu_compute_type, integer_one_node)),
+ convert (gnu_compute_type, integer_zero_node));
+ }
+
+ /* If this has a PLACEHOLDER_EXPR, qualify it by the object we are
+ handling. Note that these attributes could not have been used on
+ an unconstrained array type. */
+ gnu_result = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_result,
+ gnu_prefix);
+
+ /* Cache the expression we have just computed. Since we want to do it
+ at runtime, we force the use of a SAVE_EXPR and let the gimplifier
+ create the temporary. */
+ if (pa)
+ {
+ gnu_result
+ = build1 (SAVE_EXPR, TREE_TYPE (gnu_result), gnu_result);
+ TREE_SIDE_EFFECTS (gnu_result) = 1;
+ TREE_INVARIANT (gnu_result) = 1;
+ if (attribute == Attr_First)
+ pa->first = gnu_result;
+ else if (attribute == Attr_Last)
+ pa->last = gnu_result;
+ else
+ pa->length = gnu_result;
+ }
+ break;
+ }
+
+ case Attr_Bit_Position:
+ case Attr_Position:
+ case Attr_First_Bit:
+ case Attr_Last_Bit:
+ case Attr_Bit:
+ {
+ HOST_WIDE_INT bitsize;
+ HOST_WIDE_INT bitpos;
+ tree gnu_offset;
+ tree gnu_field_bitpos;
+ tree gnu_field_offset;
+ tree gnu_inner;
+ enum machine_mode mode;
+ int unsignedp, volatilep;
+
+ gnu_result_type = get_unpadded_type (Etype (gnat_node));
+ gnu_prefix = remove_conversions (gnu_prefix, true);
+ prefix_unused = true;
+
+ /* We can have 'Bit on any object, but if it isn't a COMPONENT_REF,
+ the result is 0. Don't allow 'Bit on a bare component, though. */
+ if (attribute == Attr_Bit
+ && TREE_CODE (gnu_prefix) != COMPONENT_REF
+ && TREE_CODE (gnu_prefix) != FIELD_DECL)
+ {
+ gnu_result = integer_zero_node;
+ break;
+ }
+
+ else
+ gcc_assert (TREE_CODE (gnu_prefix) == COMPONENT_REF
+ || (attribute == Attr_Bit_Position
+ && TREE_CODE (gnu_prefix) == FIELD_DECL));
+
+ get_inner_reference (gnu_prefix, &bitsize, &bitpos, &gnu_offset,
+ &mode, &unsignedp, &volatilep, false);
+
+ if (TREE_CODE (gnu_prefix) == COMPONENT_REF)
+ {
+ gnu_field_bitpos = bit_position (TREE_OPERAND (gnu_prefix, 1));
+ gnu_field_offset = byte_position (TREE_OPERAND (gnu_prefix, 1));
+
+ for (gnu_inner = TREE_OPERAND (gnu_prefix, 0);
+ TREE_CODE (gnu_inner) == COMPONENT_REF
+ && DECL_INTERNAL_P (TREE_OPERAND (gnu_inner, 1));
+ gnu_inner = TREE_OPERAND (gnu_inner, 0))
+ {
+ gnu_field_bitpos
+ = size_binop (PLUS_EXPR, gnu_field_bitpos,
+ bit_position (TREE_OPERAND (gnu_inner, 1)));
+ gnu_field_offset
+ = size_binop (PLUS_EXPR, gnu_field_offset,
+ byte_position (TREE_OPERAND (gnu_inner, 1)));
+ }
+ }
+ else if (TREE_CODE (gnu_prefix) == FIELD_DECL)
+ {
+ gnu_field_bitpos = bit_position (gnu_prefix);
+ gnu_field_offset = byte_position (gnu_prefix);
+ }
+ else
+ {
+ gnu_field_bitpos = bitsize_zero_node;
+ gnu_field_offset = size_zero_node;
+ }
+
+ switch (attribute)
+ {
+ case Attr_Position:
+ gnu_result = gnu_field_offset;
+ break;
+
+ case Attr_First_Bit:
+ case Attr_Bit:
+ gnu_result = size_int (bitpos % BITS_PER_UNIT);
+ break;
+
+ case Attr_Last_Bit:
+ gnu_result = bitsize_int (bitpos % BITS_PER_UNIT);
+ gnu_result = size_binop (PLUS_EXPR, gnu_result,
+ TYPE_SIZE (TREE_TYPE (gnu_prefix)));
+ gnu_result = size_binop (MINUS_EXPR, gnu_result,
+ bitsize_one_node);
+ break;
+
+ case Attr_Bit_Position:
+ gnu_result = gnu_field_bitpos;
+ break;
+ }
+
+ /* If this has a PLACEHOLDER_EXPR, qualify it by the object
+ we are handling. */
+ gnu_result = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_result, gnu_prefix);
+ break;
+ }
+
+ case Attr_Min:
+ case Attr_Max:
+ {
+ tree gnu_lhs = gnat_to_gnu (First (Expressions (gnat_node)));
+ tree gnu_rhs = gnat_to_gnu (Next (First (Expressions (gnat_node))));
+
+ gnu_result_type = get_unpadded_type (Etype (gnat_node));
+ gnu_result = build_binary_op (attribute == Attr_Min
+ ? MIN_EXPR : MAX_EXPR,
+ gnu_result_type, gnu_lhs, gnu_rhs);
+ }
+ break;
+
+ case Attr_Passed_By_Reference:
+ gnu_result = size_int (default_pass_by_ref (gnu_type)
+ || must_pass_by_ref (gnu_type));
+ gnu_result_type = get_unpadded_type (Etype (gnat_node));
+ break;
+
+ case Attr_Component_Size:
+ if (TREE_CODE (gnu_prefix) == COMPONENT_REF
+ && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))
+ == RECORD_TYPE)
+ && (TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))))
+ gnu_prefix = TREE_OPERAND (gnu_prefix, 0);
+
+ gnu_prefix = maybe_implicit_deref (gnu_prefix);
+ gnu_type = TREE_TYPE (gnu_prefix);
+
+ if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
+ gnu_type = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_type))));
+
+ while (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
+ && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type)))
+ gnu_type = TREE_TYPE (gnu_type);
+
+ gcc_assert (TREE_CODE (gnu_type) == ARRAY_TYPE);
+
+ /* Note this size cannot be self-referential. */
+ gnu_result = TYPE_SIZE (TREE_TYPE (gnu_type));
+ gnu_result_type = get_unpadded_type (Etype (gnat_node));
+ prefix_unused = true;
+ break;
+
+ case Attr_Null_Parameter:
+ /* This is just a zero cast to the pointer type for
+ our prefix and dereferenced. */
+ gnu_result_type = get_unpadded_type (Etype (gnat_node));
+ gnu_result
+ = build_unary_op (INDIRECT_REF, NULL_TREE,
+ convert (build_pointer_type (gnu_result_type),
+ integer_zero_node));
+ TREE_PRIVATE (gnu_result) = 1;
+ break;
+
+ case Attr_Mechanism_Code:
+ {
+ int code;
+ Entity_Id gnat_obj = Entity (Prefix (gnat_node));
+
+ prefix_unused = true;
+ gnu_result_type = get_unpadded_type (Etype (gnat_node));
+ if (Present (Expressions (gnat_node)))
+ {
+ int i = UI_To_Int (Intval (First (Expressions (gnat_node))));
+
+ for (gnat_obj = First_Formal (gnat_obj); i > 1;
+ i--, gnat_obj = Next_Formal (gnat_obj))
+ ;
+ }
+
+ code = Mechanism (gnat_obj);
+ if (code == Default)
+ code = ((present_gnu_tree (gnat_obj)
+ && (DECL_BY_REF_P (get_gnu_tree (gnat_obj))
+ || ((TREE_CODE (get_gnu_tree (gnat_obj))
+ == PARM_DECL)
+ && (DECL_BY_COMPONENT_PTR_P
+ (get_gnu_tree (gnat_obj))))))
+ ? By_Reference : By_Copy);
+ gnu_result = convert (gnu_result_type, size_int (- code));
+ }
+ break;
+
+ default:
+ /* Say we have an unimplemented attribute. Then set the value to be
+ returned to be a zero and hope that's something we can convert to the
+ type of this attribute. */
+ post_error ("unimplemented attribute", gnat_node);
+ gnu_result_type = get_unpadded_type (Etype (gnat_node));
+ gnu_result = integer_zero_node;
+ break;
+ }
+
+ /* If this is an attribute where the prefix was unused, force a use of it if
+ it has a side-effect. But don't do it if the prefix is just an entity
+ name. However, if an access check is needed, we must do it. See second
+ example in AARM 11.6(5.e). */
+ if (prefix_unused && TREE_SIDE_EFFECTS (gnu_prefix)
+ && !Is_Entity_Name (Prefix (gnat_node)))
+ gnu_result = fold_build2 (COMPOUND_EXPR, TREE_TYPE (gnu_result),
+ gnu_prefix, gnu_result);
+
+ *gnu_result_type_p = gnu_result_type;
+ return gnu_result;
+}
+\f
+/* Subroutine of gnat_to_gnu to translate gnat_node, an N_Case_Statement,
+ to a GCC tree, which is returned. */
+
+static tree
+Case_Statement_to_gnu (Node_Id gnat_node)
+{
+ tree gnu_result;
+ tree gnu_expr;
+ Node_Id gnat_when;
+
+ gnu_expr = gnat_to_gnu (Expression (gnat_node));
+ gnu_expr = convert (get_base_type (TREE_TYPE (gnu_expr)), gnu_expr);
+
+ /* The range of values in a case statement is determined by the rules in
+ RM 5.4(7-9). In almost all cases, this range is represented by the Etype
+ of the expression. One exception arises in the case of a simple name that
+ is parenthesized. This still has the Etype of the name, but since it is
+ not a name, para 7 does not apply, and we need to go to the base type.
+ This is the only case where parenthesization affects the dynamic
+ semantics (i.e. the range of possible values at runtime that is covered
+ by the others alternative.
+
+ Another exception is if the subtype of the expression is non-static. In
+ that case, we also have to use the base type. */
+ if (Paren_Count (Expression (gnat_node)) != 0
+ || !Is_OK_Static_Subtype (Underlying_Type
+ (Etype (Expression (gnat_node)))))
+ gnu_expr = convert (get_base_type (TREE_TYPE (gnu_expr)), gnu_expr);
+
+ /* We build a SWITCH_EXPR that contains the code with interspersed
+ CASE_LABEL_EXPRs for each label. */
+
+ push_stack (&gnu_switch_label_stack, NULL_TREE, create_artificial_label ());
+ start_stmt_group ();
+ for (gnat_when = First_Non_Pragma (Alternatives (gnat_node));
+ Present (gnat_when);
+ gnat_when = Next_Non_Pragma (gnat_when))
+ {
+ Node_Id gnat_choice;
+ int choices_added = 0;
+
+ /* First compile all the different case choices for the current WHEN
+ alternative. */
+ for (gnat_choice = First (Discrete_Choices (gnat_when));
+ Present (gnat_choice); gnat_choice = Next (gnat_choice))
+ {
+ tree gnu_low = NULL_TREE, gnu_high = NULL_TREE;
+
+ switch (Nkind (gnat_choice))
+ {
+ case N_Range:
+ gnu_low = gnat_to_gnu (Low_Bound (gnat_choice));
+ gnu_high = gnat_to_gnu (High_Bound (gnat_choice));
+ break;
+
+ case N_Subtype_Indication:
+ gnu_low = gnat_to_gnu (Low_Bound (Range_Expression
+ (Constraint (gnat_choice))));
+ gnu_high = gnat_to_gnu (High_Bound (Range_Expression
+ (Constraint (gnat_choice))));
+ break;
+
+ case N_Identifier:
+ case N_Expanded_Name:
+ /* This represents either a subtype range or a static value of
+ some kind; Ekind says which. */
+ if (IN (Ekind (Entity (gnat_choice)), Type_Kind))
+ {
+ tree gnu_type = get_unpadded_type (Entity (gnat_choice));
+
+ gnu_low = fold (TYPE_MIN_VALUE (gnu_type));
+ gnu_high = fold (TYPE_MAX_VALUE (gnu_type));
+ break;
+ }
+
+ /* ... fall through ... */
+
+ case N_Character_Literal:
+ case N_Integer_Literal:
+ gnu_low = gnat_to_gnu (gnat_choice);
+ break;
+
+ case N_Others_Choice:
+ break;
+
+ default:
+ gcc_unreachable ();
+ }
+
+ /* If the case value is a subtype that raises Constraint_Error at
+ run-time because of a wrong bound, then gnu_low or gnu_high
+ is not translated into an INTEGER_CST. In such a case, we need
+ to ensure that the when statement is not added in the tree,
+ otherwise it will crash the gimplifier. */
+ if ((!gnu_low || TREE_CODE (gnu_low) == INTEGER_CST)
+ && (!gnu_high || TREE_CODE (gnu_high) == INTEGER_CST))
+ {
+
+ add_stmt_with_node (build3 (CASE_LABEL_EXPR, void_type_node,
+ gnu_low, gnu_high,
+ create_artificial_label ()),
+ gnat_choice);
+ choices_added++;
+ }
+ }
+
+ /* Push a binding level here in case variables are declared since we want
+ them to be local to this set of statements instead of the block
+ containing the Case statement. */
+
+ if (choices_added > 0)
+ {
+ add_stmt (build_stmt_group (Statements (gnat_when), true));
+ add_stmt (build1 (GOTO_EXPR, void_type_node,
+ TREE_VALUE (gnu_switch_label_stack)));
+ }
+ }
+
+ /* Now emit a definition of the label all the cases branched to. */
+ add_stmt (build1 (LABEL_EXPR, void_type_node,
+ TREE_VALUE (gnu_switch_label_stack)));
+ gnu_result = build3 (SWITCH_EXPR, TREE_TYPE (gnu_expr), gnu_expr,
+ end_stmt_group (), NULL_TREE);
+ pop_stack (&gnu_switch_label_stack);
+
+ return gnu_result;
+}
+\f
+/* Subroutine of gnat_to_gnu to translate gnat_node, an N_Loop_Statement,
+ to a GCC tree, which is returned. */
+
+static tree
+Loop_Statement_to_gnu (Node_Id gnat_node)
+{
+ /* ??? It would be nice to use "build" here, but there's no build5. */
+ tree gnu_loop_stmt = build_nt (LOOP_STMT, NULL_TREE, NULL_TREE,
+ NULL_TREE, NULL_TREE, NULL_TREE);
+ tree gnu_loop_var = NULL_TREE;
+ Node_Id gnat_iter_scheme = Iteration_Scheme (gnat_node);
+ tree gnu_cond_expr = NULL_TREE;
+ tree gnu_result;
+
+ TREE_TYPE (gnu_loop_stmt) = void_type_node;
+ TREE_SIDE_EFFECTS (gnu_loop_stmt) = 1;
+ LOOP_STMT_LABEL (gnu_loop_stmt) = create_artificial_label ();
+ annotate_with_node (gnu_loop_stmt, gnat_node);
+
+ /* Save the end label of this LOOP_STMT in a stack so that the corresponding
+ N_Exit_Statement can find it. */
+ push_stack (&gnu_loop_label_stack, NULL_TREE,
+ LOOP_STMT_LABEL (gnu_loop_stmt));
+
+ /* Set the condition that under which the loop should continue.
+ For "LOOP .... END LOOP;" the condition is always true. */
+ if (No (gnat_iter_scheme))
+ ;
+ /* The case "WHILE condition LOOP ..... END LOOP;" */
+ else if (Present (Condition (gnat_iter_scheme)))
+ LOOP_STMT_TOP_COND (gnu_loop_stmt)
+ = gnat_to_gnu (Condition (gnat_iter_scheme));
+ else
+ {
+ /* We have an iteration scheme. */
+ Node_Id gnat_loop_spec = Loop_Parameter_Specification (gnat_iter_scheme);
+ Entity_Id gnat_loop_var = Defining_Entity (gnat_loop_spec);
+ Entity_Id gnat_type = Etype (gnat_loop_var);
+ tree gnu_type = get_unpadded_type (gnat_type);
+ tree gnu_low = TYPE_MIN_VALUE (gnu_type);
+ tree gnu_high = TYPE_MAX_VALUE (gnu_type);
+ bool reversep = Reverse_Present (gnat_loop_spec);
+ tree gnu_first = reversep ? gnu_high : gnu_low;
+ tree gnu_last = reversep ? gnu_low : gnu_high;
+ enum tree_code end_code = reversep ? GE_EXPR : LE_EXPR;
+ tree gnu_base_type = get_base_type (gnu_type);
+ tree gnu_limit = (reversep ? TYPE_MIN_VALUE (gnu_base_type)
+ : TYPE_MAX_VALUE (gnu_base_type));
+
+ /* We know the loop variable will not overflow if GNU_LAST is a constant
+ and is not equal to GNU_LIMIT. If it might overflow, we have to move
+ the limit test to the end of the loop. In that case, we have to test
+ for an empty loop outside the loop. */
+ if (TREE_CODE (gnu_last) != INTEGER_CST
+ || TREE_CODE (gnu_limit) != INTEGER_CST
+ || tree_int_cst_equal (gnu_last, gnu_limit))
+ {
+ gnu_cond_expr
+ = build3 (COND_EXPR, void_type_node,
+ build_binary_op (LE_EXPR, integer_type_node,
+ gnu_low, gnu_high),
+ NULL_TREE, alloc_stmt_list ());
+ annotate_with_node (gnu_cond_expr, gnat_loop_spec);
+ }
+
+ /* Open a new nesting level that will surround the loop to declare the
+ loop index variable. */
+ start_stmt_group ();
+ gnat_pushlevel ();
+
+ /* Declare the loop index and set it to its initial value. */
+ gnu_loop_var = gnat_to_gnu_entity (gnat_loop_var, gnu_first, 1);
+ if (DECL_BY_REF_P (gnu_loop_var))
+ gnu_loop_var = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_loop_var);
+
+ /* The loop variable might be a padded type, so use `convert' to get a
+ reference to the inner variable if so. */
+ gnu_loop_var = convert (get_base_type (gnu_type), gnu_loop_var);
+
+ /* Set either the top or bottom exit condition as appropriate depending
+ on whether or not we know an overflow cannot occur. */
+ if (gnu_cond_expr)
+ LOOP_STMT_BOT_COND (gnu_loop_stmt)
+ = build_binary_op (NE_EXPR, integer_type_node,
+ gnu_loop_var, gnu_last);
+ else
+ LOOP_STMT_TOP_COND (gnu_loop_stmt)
+ = build_binary_op (end_code, integer_type_node,
+ gnu_loop_var, gnu_last);
+
+ LOOP_STMT_UPDATE (gnu_loop_stmt)
+ = build_binary_op (reversep ? PREDECREMENT_EXPR
+ : PREINCREMENT_EXPR,
+ TREE_TYPE (gnu_loop_var),
+ gnu_loop_var,
+ convert (TREE_TYPE (gnu_loop_var),
+ integer_one_node));
+ annotate_with_node (LOOP_STMT_UPDATE (gnu_loop_stmt),
+ gnat_iter_scheme);
+ }
+
+ /* If the loop was named, have the name point to this loop. In this case,
+ the association is not a ..._DECL node, but the end label from this
+ LOOP_STMT. */
+ if (Present (Identifier (gnat_node)))
+ save_gnu_tree (Entity (Identifier (gnat_node)),
+ LOOP_STMT_LABEL (gnu_loop_stmt), true);
+
+ /* Make the loop body into its own block, so any allocated storage will be
+ released every iteration. This is needed for stack allocation. */
+ LOOP_STMT_BODY (gnu_loop_stmt)
+ = build_stmt_group (Statements (gnat_node), true);
+
+ /* If we declared a variable, then we are in a statement group for that
+ declaration. Add the LOOP_STMT to it and make that the "loop". */
+ if (gnu_loop_var)
+ {
+ add_stmt (gnu_loop_stmt);
+ gnat_poplevel ();
+ gnu_loop_stmt = end_stmt_group ();
+ }
+
+ /* If we have an outer COND_EXPR, that's our result and this loop is its
+ "true" statement. Otherwise, the result is the LOOP_STMT. */
+ if (gnu_cond_expr)
+ {
+ COND_EXPR_THEN (gnu_cond_expr) = gnu_loop_stmt;
+ gnu_result = gnu_cond_expr;
+ recalculate_side_effects (gnu_cond_expr);
+ }
+ else
+ gnu_result = gnu_loop_stmt;
+
+ pop_stack (&gnu_loop_label_stack);
+
+ return gnu_result;
+}
+\f
+/* Emit statements to establish __gnat_handle_vms_condition as a VMS condition
+ handler for the current function. */
+
+/* This is implemented by issuing a call to the appropriate VMS specific
+ builtin. To avoid having VMS specific sections in the global gigi decls
+ array, we maintain the decls of interest here. We can't declare them
+ inside the function because we must mark them never to be GC'd, which we
+ can only do at the global level. */
+
+static GTY(()) tree vms_builtin_establish_handler_decl = NULL_TREE;
+static GTY(()) tree gnat_vms_condition_handler_decl = NULL_TREE;
+
+static void
+establish_gnat_vms_condition_handler (void)
+{
+ tree establish_stmt;
+
+ /* Elaborate the required decls on the first call. Check on the decl for
+ the gnat condition handler to decide, as this is one we create so we are
+ sure that it will be non null on subsequent calls. The builtin decl is
+ looked up so remains null on targets where it is not implemented yet. */
+ if (gnat_vms_condition_handler_decl == NULL_TREE)
+ {
+ vms_builtin_establish_handler_decl
+ = builtin_decl_for
+ (get_identifier ("__builtin_establish_vms_condition_handler"));
+
+ gnat_vms_condition_handler_decl
+ = create_subprog_decl (get_identifier ("__gnat_handle_vms_condition"),
+ NULL_TREE,
+ build_function_type_list (integer_type_node,
+ ptr_void_type_node,
+ ptr_void_type_node,
+ NULL_TREE),
+ NULL_TREE, 0, 1, 1, 0, Empty);
+ }
+
+ /* Do nothing if the establish builtin is not available, which might happen
+ on targets where the facility is not implemented. */
+ if (vms_builtin_establish_handler_decl == NULL_TREE)
+ return;
+
+ establish_stmt
+ = build_call_1_expr (vms_builtin_establish_handler_decl,
+ build_unary_op
+ (ADDR_EXPR, NULL_TREE,
+ gnat_vms_condition_handler_decl));
+
+ add_stmt (establish_stmt);
+}
+\f
+/* Subroutine of gnat_to_gnu to process gnat_node, an N_Subprogram_Body. We
+ don't return anything. */
+
+static void
+Subprogram_Body_to_gnu (Node_Id gnat_node)
+{
+ /* Defining identifier of a parameter to the subprogram. */
+ Entity_Id gnat_param;
+ /* The defining identifier for the subprogram body. Note that if a
+ specification has appeared before for this body, then the identifier
+ occurring in that specification will also be a defining identifier and all
+ the calls to this subprogram will point to that specification. */
+ Entity_Id gnat_subprog_id
+ = (Present (Corresponding_Spec (gnat_node))
+ ? Corresponding_Spec (gnat_node) : Defining_Entity (gnat_node));
+ /* The FUNCTION_DECL node corresponding to the subprogram spec. */
+ tree gnu_subprog_decl;
+ /* The FUNCTION_TYPE node corresponding to the subprogram spec. */
+ tree gnu_subprog_type;
+ tree gnu_cico_list;
+ tree gnu_result;
+ VEC(parm_attr,gc) *cache;
+
+ /* If this is a generic object or if it has been eliminated,
+ ignore it. */
+ if (Ekind (gnat_subprog_id) == E_Generic_Procedure
+ || Ekind (gnat_subprog_id) == E_Generic_Function
+ || Is_Eliminated (gnat_subprog_id))
+ return;
+
+ /* If this subprogram acts as its own spec, define it. Otherwise, just get
+ the already-elaborated tree node. However, if this subprogram had its
+ elaboration deferred, we will already have made a tree node for it. So
+ treat it as not being defined in that case. Such a subprogram cannot
+ have an address clause or a freeze node, so this test is safe, though it
+ does disable some otherwise-useful error checking. */
+ gnu_subprog_decl
+ = gnat_to_gnu_entity (gnat_subprog_id, NULL_TREE,
+ Acts_As_Spec (gnat_node)
+ && !present_gnu_tree (gnat_subprog_id));
+
+ gnu_subprog_type = TREE_TYPE (gnu_subprog_decl);
+
+ /* Propagate the debug mode. */
+ if (!Needs_Debug_Info (gnat_subprog_id))
+ DECL_IGNORED_P (gnu_subprog_decl) = 1;
+
+ /* Set the line number in the decl to correspond to that of the body so that
+ the line number notes are written correctly. */
+ Sloc_to_locus (Sloc (gnat_node), &DECL_SOURCE_LOCATION (gnu_subprog_decl));
+
+ /* Initialize the information structure for the function. */
+ allocate_struct_function (gnu_subprog_decl);
+ DECL_STRUCT_FUNCTION (gnu_subprog_decl)->language
+ = GGC_CNEW (struct language_function);
+
+ begin_subprog_body (gnu_subprog_decl);
+ gnu_cico_list = TYPE_CI_CO_LIST (gnu_subprog_type);
+
+ /* If there are OUT parameters, we need to ensure that the return statement
+ properly copies them out. We do this by making a new block and converting
+ any inner return into a goto to a label at the end of the block. */
+ push_stack (&gnu_return_label_stack, NULL_TREE,
+ gnu_cico_list ? create_artificial_label () : NULL_TREE);
+
+ /* Get a tree corresponding to the code for the subprogram. */
+ start_stmt_group ();
+ gnat_pushlevel ();
+
+ /* See if there are any parameters for which we don't yet have GCC entities.
+ These must be for OUT parameters for which we will be making VAR_DECL
+ nodes here. Fill them in to TYPE_CI_CO_LIST, which must contain the empty
+ entry as well. We can match up the entries because TYPE_CI_CO_LIST is in
+ the order of the parameters. */
+ for (gnat_param = First_Formal_With_Extras (gnat_subprog_id);
+ Present (gnat_param);
+ gnat_param = Next_Formal_With_Extras (gnat_param))
+ if (!present_gnu_tree (gnat_param))
+ {
+ /* Skip any entries that have been already filled in; they must
+ correspond to IN OUT parameters. */
+ for (; gnu_cico_list && TREE_VALUE (gnu_cico_list);
+ gnu_cico_list = TREE_CHAIN (gnu_cico_list))
+ ;
+
+ /* Do any needed references for padded types. */
+ TREE_VALUE (gnu_cico_list)
+ = convert (TREE_TYPE (TREE_PURPOSE (gnu_cico_list)),
+ gnat_to_gnu_entity (gnat_param, NULL_TREE, 1));
+ }
+
+ /* On VMS, establish our condition handler to possibly turn a condition into
+ the corresponding exception if the subprogram has a foreign convention or
+ is exported.
+
+ To ensure proper execution of local finalizations on condition instances,
+ we must turn a condition into the corresponding exception even if there
+ is no applicable Ada handler, and need at least one condition handler per
+ possible call chain involving GNAT code. OTOH, establishing the handler
+ has a cost so we want to minimize the number of subprograms into which
+ this happens. The foreign or exported condition is expected to satisfy
+ all the constraints. */
+ if (TARGET_ABI_OPEN_VMS
+ && (Has_Foreign_Convention (gnat_node) || Is_Exported (gnat_node)))
+ establish_gnat_vms_condition_handler ();
+
+ process_decls (Declarations (gnat_node), Empty, Empty, true, true);
+
+ /* Generate the code of the subprogram itself. A return statement will be
+ present and any OUT parameters will be handled there. */
+ add_stmt (gnat_to_gnu (Handled_Statement_Sequence (gnat_node)));
+ gnat_poplevel ();
+ gnu_result = end_stmt_group ();
+
+ /* If we populated the parameter attributes cache, we need to make sure
+ that the cached expressions are evaluated on all possible paths. */
+ cache = DECL_STRUCT_FUNCTION (gnu_subprog_decl)->language->parm_attr_cache;
+ if (cache)
+ {
+ struct parm_attr *pa;
+ int i;
+
+ start_stmt_group ();
+
+ for (i = 0; VEC_iterate (parm_attr, cache, i, pa); i++)
+ {
+ if (pa->first)
+ add_stmt (pa->first);
+ if (pa->last)
+ add_stmt (pa->last);
+ if (pa->length)
+ add_stmt (pa->length);
+ }
+
+ add_stmt (gnu_result);
+ gnu_result = end_stmt_group ();
+ }
+
+ /* If we made a special return label, we need to make a block that contains
+ the definition of that label and the copying to the return value. That
+ block first contains the function, then the label and copy statement. */
+ if (TREE_VALUE (gnu_return_label_stack))
+ {
+ tree gnu_retval;
+
+ start_stmt_group ();
+ gnat_pushlevel ();
+ add_stmt (gnu_result);
+ add_stmt (build1 (LABEL_EXPR, void_type_node,
+ TREE_VALUE (gnu_return_label_stack)));
+
+ gnu_cico_list = TYPE_CI_CO_LIST (gnu_subprog_type);
+ if (list_length (gnu_cico_list) == 1)
+ gnu_retval = TREE_VALUE (gnu_cico_list);
+ else
+ gnu_retval = gnat_build_constructor (TREE_TYPE (gnu_subprog_type),
+ gnu_cico_list);
+
+ if (DECL_P (gnu_retval) && DECL_BY_REF_P (gnu_retval))
+ gnu_retval = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_retval);
+
+ add_stmt_with_node
+ (build_return_expr (DECL_RESULT (gnu_subprog_decl), gnu_retval),
+ gnat_node);
+ gnat_poplevel ();
+ gnu_result = end_stmt_group ();
+ }
+
+ pop_stack (&gnu_return_label_stack);
+
+ /* Set the end location. */
+ Sloc_to_locus
+ ((Present (End_Label (Handled_Statement_Sequence (gnat_node)))
+ ? Sloc (End_Label (Handled_Statement_Sequence (gnat_node)))
+ : Sloc (gnat_node)),
+ &DECL_STRUCT_FUNCTION (gnu_subprog_decl)->function_end_locus);
+
+ end_subprog_body (gnu_result);
+
+ /* Disconnect the trees for parameters that we made variables for from the
+ GNAT entities since these are unusable after we end the function. */
+ for (gnat_param = First_Formal_With_Extras (gnat_subprog_id);
+ Present (gnat_param);
+ gnat_param = Next_Formal_With_Extras (gnat_param))
+ if (TREE_CODE (get_gnu_tree (gnat_param)) == VAR_DECL)
+ save_gnu_tree (gnat_param, NULL_TREE, false);
+
+ if (DECL_FUNCTION_STUB (gnu_subprog_decl))
+ build_function_stub (gnu_subprog_decl, gnat_subprog_id);
+
+ mark_out_of_scope (Defining_Unit_Name (Specification (gnat_node)));
+}
+\f
+/* Subroutine of gnat_to_gnu to translate gnat_node, either an N_Function_Call
+ or an N_Procedure_Call_Statement, to a GCC tree, which is returned.
+ GNU_RESULT_TYPE_P is a pointer to where we should place the result type.
+ If GNU_TARGET is non-null, this must be a function call and the result
+ of the call is to be placed into that object. */
+
+static tree
+call_to_gnu (Node_Id gnat_node, tree *gnu_result_type_p, tree gnu_target)
+{
+ tree gnu_result;
+ /* The GCC node corresponding to the GNAT subprogram name. This can either
+ be a FUNCTION_DECL node if we are dealing with a standard subprogram call,
+ or an indirect reference expression (an INDIRECT_REF node) pointing to a
+ subprogram. */
+ tree gnu_subprog_node = gnat_to_gnu (Name (gnat_node));
+ /* The FUNCTION_TYPE node giving the GCC type of the subprogram. */
+ tree gnu_subprog_type = TREE_TYPE (gnu_subprog_node);
+ tree gnu_subprog_addr = build_unary_op (ADDR_EXPR, NULL_TREE,
+ gnu_subprog_node);
+ Entity_Id gnat_formal;
+ Node_Id gnat_actual;
+ tree gnu_actual_list = NULL_TREE;
+ tree gnu_name_list = NULL_TREE;
+ tree gnu_before_list = NULL_TREE;
+ tree gnu_after_list = NULL_TREE;
+ tree gnu_subprog_call;
+
+ switch (Nkind (Name (gnat_node)))
+ {
+ case N_Identifier:
+ case N_Operator_Symbol:
+ case N_Expanded_Name:
+ case N_Attribute_Reference:
+ if (Is_Eliminated (Entity (Name (gnat_node))))
+ Eliminate_Error_Msg (gnat_node, Entity (Name (gnat_node)));
+ }
+
+ gcc_assert (TREE_CODE (gnu_subprog_type) == FUNCTION_TYPE);
+
+ /* If we are calling a stubbed function, make this into a raise of
+ Program_Error. Elaborate all our args first. */
+ if (TREE_CODE (gnu_subprog_node) == FUNCTION_DECL
+ && DECL_STUBBED_P (gnu_subprog_node))
+ {
+ for (gnat_actual = First_Actual (gnat_node);
+ Present (gnat_actual);
+ gnat_actual = Next_Actual (gnat_actual))
+ add_stmt (gnat_to_gnu (gnat_actual));
+
+ {
+ tree call_expr
+ = build_call_raise (PE_Stubbed_Subprogram_Called, gnat_node,
+ N_Raise_Program_Error);
+
+ if (Nkind (gnat_node) == N_Function_Call && !gnu_target)
+ {
+ *gnu_result_type_p = TREE_TYPE (gnu_subprog_type);
+ return build1 (NULL_EXPR, *gnu_result_type_p, call_expr);
+ }
+ else
+ return call_expr;
+ }
+ }
+
+ /* If we are calling by supplying a pointer to a target, set up that
+ pointer as the first argument. Use GNU_TARGET if one was passed;
+ otherwise, make a target by building a variable of the maximum size
+ of the type. */
+ if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type))
+ {
+ tree gnu_real_ret_type
+ = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (gnu_subprog_type)));
+
+ if (!gnu_target)
+ {
+ tree gnu_obj_type
+ = maybe_pad_type (gnu_real_ret_type,
+ max_size (TYPE_SIZE (gnu_real_ret_type), true),
+ 0, Etype (Name (gnat_node)), "PAD", false,
+ false, false);
+
+ /* ??? We may be about to create a static temporary if we happen to
+ be at the global binding level. That's a regression from what
+ the 3.x back-end would generate in the same situation, but we
+ don't have a mechanism in Gigi for creating automatic variables
+ in the elaboration routines. */
+ gnu_target
+ = create_var_decl (create_tmp_var_name ("LR"), NULL, gnu_obj_type,
+ NULL, false, false, false, false, NULL,
+ gnat_node);
+ }
+
+ gnu_actual_list
+ = tree_cons (NULL_TREE,
+ build_unary_op (ADDR_EXPR, NULL_TREE,
+ unchecked_convert (gnu_real_ret_type,
+ gnu_target,
+ false)),
+ NULL_TREE);
+
+ }
+
+ /* The only way we can be making a call via an access type is if Name is an
+ explicit dereference. In that case, get the list of formal args from the
+ type the access type is pointing to. Otherwise, get the formals from
+ entity being called. */
+ if (Nkind (Name (gnat_node)) == N_Explicit_Dereference)
+ gnat_formal = First_Formal_With_Extras (Etype (Name (gnat_node)));
+ else if (Nkind (Name (gnat_node)) == N_Attribute_Reference)
+ /* Assume here that this must be 'Elab_Body or 'Elab_Spec. */
+ gnat_formal = 0;
+ else
+ gnat_formal = First_Formal_With_Extras (Entity (Name (gnat_node)));
+
+ /* Create the list of the actual parameters as GCC expects it, namely a chain
+ of TREE_LIST nodes in which the TREE_VALUE field of each node is a
+ parameter-expression and the TREE_PURPOSE field is null. Skip OUT
+ parameters not passed by reference and don't need to be copied in. */
+ for (gnat_actual = First_Actual (gnat_node);
+ Present (gnat_actual);
+ gnat_formal = Next_Formal_With_Extras (gnat_formal),
+ gnat_actual = Next_Actual (gnat_actual))
+ {
+ tree gnu_formal
+ = (present_gnu_tree (gnat_formal)
+ ? get_gnu_tree (gnat_formal) : NULL_TREE);
+ tree gnu_formal_type = gnat_to_gnu_type (Etype (gnat_formal));
+ /* We treat a conversion between aggregate types as if it is an
+ unchecked conversion. */
+ bool unchecked_convert_p
+ = (Nkind (gnat_actual) == N_Unchecked_Type_Conversion
+ || (Nkind (gnat_actual) == N_Type_Conversion
+ && Is_Composite_Type (Underlying_Type (Etype (gnat_formal)))));
+ Node_Id gnat_name = (unchecked_convert_p
+ ? Expression (gnat_actual) : gnat_actual);
+ tree gnu_name = gnat_to_gnu (gnat_name);
+ tree gnu_name_type = gnat_to_gnu_type (Etype (gnat_name));
+ tree gnu_actual;
+
+ /* If it's possible we may need to use this expression twice, make sure
+ than any side-effects are handled via SAVE_EXPRs. Likewise if we need
+ to force side-effects before the call.
+
+ ??? This is more conservative than we need since we don't need to do
+ this for pass-by-ref with no conversion. If we are passing a
+ non-addressable Out or In Out parameter by reference, pass the address
+ of a copy and set up to copy back out after the call. */
+ if (Ekind (gnat_formal) != E_In_Parameter)
+ {
+ gnu_name = gnat_stabilize_reference (gnu_name, true);
+
+ if (!addressable_p (gnu_name)
+ && gnu_formal
+ && (DECL_BY_REF_P (gnu_formal)
+ || (TREE_CODE (gnu_formal) == PARM_DECL
+ && (DECL_BY_COMPONENT_PTR_P (gnu_formal)
+ || (DECL_BY_DESCRIPTOR_P (gnu_formal))))))
+ {
+ tree gnu_copy = gnu_name;
+ tree gnu_temp;
+
+ /* If the type is by_reference, a copy is not allowed. */
+ if (Is_By_Reference_Type (Etype (gnat_formal)))
+ post_error
+ ("misaligned & cannot be passed by reference", gnat_actual);
+
+ /* For users of Starlet we issue a warning because the
+ interface apparently assumes that by-ref parameters
+ outlive the procedure invocation. The code still
+ will not work as intended, but we cannot do much
+ better since other low-level parts of the back-end
+ would allocate temporaries at will because of the
+ misalignment if we did not do so here. */
+
+ else if (Is_Valued_Procedure (Entity (Name (gnat_node))))
+ {
+ post_error
+ ("?possible violation of implicit assumption",
+ gnat_actual);
+ post_error_ne
+ ("?made by pragma Import_Valued_Procedure on &",
+ gnat_actual, Entity (Name (gnat_node)));
+ post_error_ne
+ ("?because of misalignment of &",
+ gnat_actual, gnat_formal);
+ }
+
+ /* Remove any unpadding on the actual and make a copy. But if
+ the actual is a justified modular type, first convert
+ to it. */
+ if (TREE_CODE (gnu_name) == COMPONENT_REF
+ && ((TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_name, 0)))
+ == RECORD_TYPE)
+ && (TYPE_IS_PADDING_P
+ (TREE_TYPE (TREE_OPERAND (gnu_name, 0))))))
+ gnu_name = gnu_copy = TREE_OPERAND (gnu_name, 0);
+ else if (TREE_CODE (gnu_name_type) == RECORD_TYPE
+ && (TYPE_JUSTIFIED_MODULAR_P (gnu_name_type)))
+ gnu_name = convert (gnu_name_type, gnu_name);
+
+ /* Make a SAVE_EXPR to both properly account for potential side
+ effects and handle the creation of a temporary copy. Special
+ code in gnat_gimplify_expr ensures that the same temporary is
+ used as the actual and copied back after the call. */
+ gnu_actual = save_expr (gnu_name);
+
+ /* Set up to move the copy back to the original. */
+ gnu_temp = build_binary_op (MODIFY_EXPR, NULL_TREE,
+ gnu_copy, gnu_actual);
+ annotate_with_node (gnu_temp, gnat_actual);
+ append_to_statement_list (gnu_temp, &gnu_after_list);
+
+ /* Account for next statement just below. */
+ gnu_name = gnu_actual;
+ }
+ }
+
+ /* If this was a procedure call, we may not have removed any padding.
+ So do it here for the part we will use as an input, if any. */
+ gnu_actual = gnu_name;
+ if (Ekind (gnat_formal) != E_Out_Parameter
+ && TREE_CODE (TREE_TYPE (gnu_actual)) == RECORD_TYPE
+ && TYPE_IS_PADDING_P (TREE_TYPE (gnu_actual)))
+ gnu_actual = convert (get_unpadded_type (Etype (gnat_actual)),
+ gnu_actual);
+
+ /* Unless this is an In parameter, we must remove any LJM building
+ from GNU_NAME. */
+ if (Ekind (gnat_formal) != E_In_Parameter
+ && TREE_CODE (gnu_name) == CONSTRUCTOR
+ && TREE_CODE (TREE_TYPE (gnu_name)) == RECORD_TYPE
+ && TYPE_JUSTIFIED_MODULAR_P (TREE_TYPE (gnu_name)))
+ gnu_name = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_name))),
+ gnu_name);
+
+ if (Ekind (gnat_formal) != E_Out_Parameter
+ && !unchecked_convert_p
+ && Do_Range_Check (gnat_actual))
+ gnu_actual = emit_range_check (gnu_actual, Etype (gnat_formal));
+
+ /* Do any needed conversions. We need only check for unchecked
+ conversion since normal conversions will be handled by just
+ converting to the formal type. */
+ if (unchecked_convert_p)
+ {
+ gnu_actual
+ = unchecked_convert (gnat_to_gnu_type (Etype (gnat_actual)),
+ gnu_actual,
+ (Nkind (gnat_actual)
+ == N_Unchecked_Type_Conversion)
+ && No_Truncation (gnat_actual));
+
+ /* One we've done the unchecked conversion, we still must ensure that
+ the object is in range of the formal's type. */
+ if (Ekind (gnat_formal) != E_Out_Parameter
+ && Do_Range_Check (gnat_actual))
+ gnu_actual = emit_range_check (gnu_actual,
+ Etype (gnat_formal));
+ }
+ else if (TREE_CODE (gnu_actual) != SAVE_EXPR)
+ /* We may have suppressed a conversion to the Etype of the actual since
+ the parent is a procedure call. So add the conversion here. */
+ gnu_actual = convert (gnat_to_gnu_type (Etype (gnat_actual)),
+ gnu_actual);
+
+ if (TREE_CODE (gnu_actual) != SAVE_EXPR)
+ gnu_actual = convert (gnu_formal_type, gnu_actual);
+
+ /* If we have not saved a GCC object for the formal, it means it is an
+ OUT parameter not passed by reference and that does not need to be
+ copied in. Otherwise, look at the PARM_DECL to see if it is passed by
+ reference. */
+ if (gnu_formal
+ && TREE_CODE (gnu_formal) == PARM_DECL && DECL_BY_REF_P (gnu_formal))
+ {
+ if (Ekind (gnat_formal) != E_In_Parameter)
+ {
+ gnu_actual = gnu_name;
+
+ /* If we have a padded type, be sure we've removed padding. */
+ if (TREE_CODE (TREE_TYPE (gnu_actual)) == RECORD_TYPE
+ && TYPE_IS_PADDING_P (TREE_TYPE (gnu_actual))
+ && TREE_CODE (gnu_actual) != SAVE_EXPR)
+ gnu_actual = convert (get_unpadded_type (Etype (gnat_actual)),
+ gnu_actual);
+
+ /* If we have the constructed subtype of an aliased object
+ with an unconstrained nominal subtype, the type of the
+ actual includes the template, although it is formally
+ constrained. So we need to convert it back to the real
+ constructed subtype to retrieve the constrained part
+ and takes its address. */
+ if (TREE_CODE (TREE_TYPE (gnu_actual)) == RECORD_TYPE
+ && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (gnu_actual))
+ && TREE_CODE (gnu_actual) != SAVE_EXPR
+ && Is_Constr_Subt_For_UN_Aliased (Etype (gnat_actual))
+ && Is_Array_Type (Etype (gnat_actual)))
+ gnu_actual = convert (gnat_to_gnu_type (Etype (gnat_actual)),
+ gnu_actual);
+ }
+
+ /* Otherwise, if we have a non-addressable COMPONENT_REF of a
+ variable-size type see if it's doing a unpadding operation. If
+ so, remove that operation since we have no way of allocating the
+ required temporary. */
+ if (TREE_CODE (gnu_actual) == COMPONENT_REF
+ && !TREE_CONSTANT (TYPE_SIZE (TREE_TYPE (gnu_actual)))
+ && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_actual, 0)))
+ == RECORD_TYPE)
+ && TYPE_IS_PADDING_P (TREE_TYPE
+ (TREE_OPERAND (gnu_actual, 0)))
+ && !addressable_p (gnu_actual))
+ gnu_actual = TREE_OPERAND (gnu_actual, 0);
+
+ /* For In parameters, gnu_actual might still not be addressable at
+ this point and we need the creation of a temporary copy since
+ this is to be passed by ref. Resorting to save_expr to force a
+ SAVE_EXPR temporary creation here is not guaranteed to work
+ because the actual might be invariant or readonly without side
+ effects, so we let the gimplifier process this case. */
+
+ /* The symmetry of the paths to the type of an entity is broken here
+ since arguments don't know that they will be passed by ref. */
+ gnu_formal_type = TREE_TYPE (get_gnu_tree (gnat_formal));
+ gnu_actual = build_unary_op (ADDR_EXPR, gnu_formal_type, gnu_actual);
+ }
+ else if (gnu_formal && TREE_CODE (gnu_formal) == PARM_DECL
+ && DECL_BY_COMPONENT_PTR_P (gnu_formal))
+ {
+ gnu_formal_type = TREE_TYPE (get_gnu_tree (gnat_formal));
+ gnu_actual = maybe_implicit_deref (gnu_actual);
+ gnu_actual = maybe_unconstrained_array (gnu_actual);
+
+ if (TREE_CODE (gnu_formal_type) == RECORD_TYPE
+ && TYPE_IS_PADDING_P (gnu_formal_type))
+ {
+ gnu_formal_type = TREE_TYPE (TYPE_FIELDS (gnu_formal_type));
+ gnu_actual = convert (gnu_formal_type, gnu_actual);
+ }
+
+ /* Take the address of the object and convert to the proper pointer
+ type. We'd like to actually compute the address of the beginning
+ of the array using an ADDR_EXPR of an ARRAY_REF, but there's a
+ possibility that the ARRAY_REF might return a constant and we'd be
+ getting the wrong address. Neither approach is exactly correct,
+ but this is the most likely to work in all cases. */
+ gnu_actual = convert (gnu_formal_type,
+ build_unary_op (ADDR_EXPR, NULL_TREE,
+ gnu_actual));
+ }
+ else if (gnu_formal && TREE_CODE (gnu_formal) == PARM_DECL
+ && DECL_BY_DESCRIPTOR_P (gnu_formal))
+ {
+ /* If arg is 'Null_Parameter, pass zero descriptor. */
+ if ((TREE_CODE (gnu_actual) == INDIRECT_REF
+ || TREE_CODE (gnu_actual) == UNCONSTRAINED_ARRAY_REF)
+ && TREE_PRIVATE (gnu_actual))
+ gnu_actual = convert (DECL_ARG_TYPE (get_gnu_tree (gnat_formal)),
+ integer_zero_node);
+ else
+ gnu_actual = build_unary_op (ADDR_EXPR, NULL_TREE,
+ fill_vms_descriptor (gnu_actual,
+ gnat_formal));
+ }
+ else
+ {
+ tree gnu_actual_size = TYPE_SIZE (TREE_TYPE (gnu_actual));
+
+ if (Ekind (gnat_formal) != E_In_Parameter)
+ gnu_name_list = tree_cons (NULL_TREE, gnu_name, gnu_name_list);
+
+ if (!gnu_formal || TREE_CODE (gnu_formal) != PARM_DECL)
+ continue;
+
+ /* If this is 'Null_Parameter, pass a zero even though we are
+ dereferencing it. */
+ else if (TREE_CODE (gnu_actual) == INDIRECT_REF
+ && TREE_PRIVATE (gnu_actual)
+ && host_integerp (gnu_actual_size, 1)
+ && 0 >= compare_tree_int (gnu_actual_size,
+ BITS_PER_WORD))
+ gnu_actual
+ = unchecked_convert (DECL_ARG_TYPE (gnu_formal),
+ convert (gnat_type_for_size
+ (tree_low_cst (gnu_actual_size, 1),
+ 1),
+ integer_zero_node),
+ false);
+ else
+ gnu_actual = convert (DECL_ARG_TYPE (gnu_formal), gnu_actual);
+ }
+
+ gnu_actual_list = tree_cons (NULL_TREE, gnu_actual, gnu_actual_list);
+ }
+
+ gnu_subprog_call = build_call_list (TREE_TYPE (gnu_subprog_type),
+ gnu_subprog_addr,
+ nreverse (gnu_actual_list));
+
+ /* If we return by passing a target, the result is the target after the
+ call. We must not emit the call directly here because this might be
+ evaluated as part of an expression with conditions to control whether
+ the call should be emitted or not. */
+ if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type))
+ {
+ /* Conceptually, what we need is a COMPOUND_EXPR with the call followed
+ by the target object converted to the proper type. Doing so would
+ potentially be very inefficient, however, as this expresssion might
+ end up wrapped into an outer SAVE_EXPR later on, which would incur a
+ pointless temporary copy of the whole object.
-/* Flag indicating whether file names are discarded in exception messages */
-int discard_file_names;
+ What we do instead is build a COMPOUND_EXPR returning the address of
+ the target, and then dereference. Wrapping the COMPOUND_EXPR into a
+ SAVE_EXPR later on then only incurs a pointer copy. */
-/* If true, then gigi is being called on an analyzed but unexpanded
- tree, and the only purpose of the call is to properly annotate
- types with representation information. */
-int type_annotate_only;
+ tree gnu_result_type
+ = TREE_TYPE (TREE_VALUE (TYPE_ARG_TYPES (gnu_subprog_type)));
-/* List of TREE_LIST nodes representing a block stack. TREE_VALUE
- of each gives the variable used for the setjmp buffer in the current
- block, if any. TREE_PURPOSE gives the bottom condition for a loop,
- if this block is for a loop. The latter is only used to save the tree
- over GC. */
-tree gnu_block_stack;
+ /* Build and return
+ (result_type) *[gnu_subprog_call (&gnu_target, ...), &gnu_target] */
-/* List of TREE_LIST nodes representing a stack of exception pointer
- variables. TREE_VALUE is the VAR_DECL that stores the address of
- the raised exception. Nonzero means we are in an exception
- handler. Not used in the zero-cost case. */
-static GTY(()) tree gnu_except_ptr_stack;
+ tree gnu_target_address
+ = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_target);
-/* List of TREE_LIST nodes containing pending elaborations lists.
- used to prevent the elaborations being reclaimed by GC. */
-static GTY(()) tree gnu_pending_elaboration_lists;
+ gnu_result
+ = build2 (COMPOUND_EXPR, TREE_TYPE (gnu_target_address),
+ gnu_subprog_call, gnu_target_address);
-/* Map GNAT tree codes to GCC tree codes for simple expressions. */
-static enum tree_code gnu_codes[Number_Node_Kinds];
+ gnu_result
+ = unchecked_convert (gnu_result_type,
+ build_unary_op (INDIRECT_REF, NULL_TREE,
+ gnu_result),
+ false);
-/* Current node being treated, in case gigi_abort called. */
-Node_Id error_gnat_node;
+ *gnu_result_type_p = gnu_result_type;
+ return gnu_result;
+ }
-/* Variable that stores a list of labels to be used as a goto target instead of
- a return in some functions. See processing for N_Subprogram_Body. */
-static GTY(()) tree gnu_return_label_stack;
+ /* If it is a function call, the result is the call expression unless
+ a target is specified, in which case we copy the result into the target
+ and return the assignment statement. */
+ else if (Nkind (gnat_node) == N_Function_Call)
+ {
+ gnu_result = gnu_subprog_call;
-static tree tree_transform (Node_Id);
-static rtx first_nondeleted_insn (rtx);
-static tree build_block_stmt (List_Id);
-static tree make_expr_stmt_from_rtl (rtx, Node_Id);
-static void elaborate_all_entities (Node_Id);
-static void process_freeze_entity (Node_Id);
-static void process_inlined_subprograms (Node_Id);
-static void process_decls (List_Id, List_Id, Node_Id, int, int);
-static tree emit_range_check (tree, Node_Id);
-static tree emit_index_check (tree, tree, tree, tree);
-static tree emit_check (tree, tree, int);
-static tree convert_with_check (Entity_Id, tree, int, int, int);
-static int addressable_p (tree);
-static tree assoc_to_constructor (Node_Id, tree);
-static tree extract_values (tree, tree);
-static tree pos_to_constructor (Node_Id, tree, Entity_Id);
-static tree maybe_implicit_deref (tree);
-static tree gnat_stabilize_reference_1 (tree, int);
-static int build_unit_elab (Entity_Id, int, tree);
+ /* If the function returns an unconstrained array or by reference,
+ we have to de-dereference the pointer. */
+ if (TYPE_RETURNS_UNCONSTRAINED_P (gnu_subprog_type)
+ || TYPE_RETURNS_BY_REF_P (gnu_subprog_type))
+ gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_result);
-/* Constants for +0.5 and -0.5 for float-to-integer rounding. */
-static REAL_VALUE_TYPE dconstp5;
-static REAL_VALUE_TYPE dconstmp5;
-\f
-/* This is the main program of the back-end. It sets up all the table
- structures and then generates code. */
+ if (gnu_target)
+ gnu_result = build_binary_op (MODIFY_EXPR, NULL_TREE,
+ gnu_target, gnu_result);
+ else
+ *gnu_result_type_p = get_unpadded_type (Etype (gnat_node));
-void
-gigi (Node_Id gnat_root,
- int max_gnat_node,
- int number_name,
- struct Node *nodes_ptr,
- Node_Id *next_node_ptr,
- Node_Id *prev_node_ptr,
- struct Elist_Header *elists_ptr,
- struct Elmt_Item *elmts_ptr,
- struct String_Entry *strings_ptr,
- Char_Code *string_chars_ptr,
- struct List_Header *list_headers_ptr,
- Int number_units ATTRIBUTE_UNUSED,
- char *file_info_ptr ATTRIBUTE_UNUSED,
- Entity_Id standard_integer,
- Entity_Id standard_long_long_float,
- Entity_Id standard_exception_type,
- Int gigi_operating_mode)
-{
- tree gnu_standard_long_long_float;
- tree gnu_standard_exception_type;
+ return gnu_result;
+ }
- max_gnat_nodes = max_gnat_node;
- number_names = number_name;
- Nodes_Ptr = nodes_ptr;
- Next_Node_Ptr = next_node_ptr;
- Prev_Node_Ptr = prev_node_ptr;
- Elists_Ptr = elists_ptr;
- Elmts_Ptr = elmts_ptr;
- Strings_Ptr = strings_ptr;
- String_Chars_Ptr = string_chars_ptr;
- List_Headers_Ptr = list_headers_ptr;
+ /* If this is the case where the GNAT tree contains a procedure call
+ but the Ada procedure has copy in copy out parameters, the special
+ parameter passing mechanism must be used. */
+ else if (TYPE_CI_CO_LIST (gnu_subprog_type) != NULL_TREE)
+ {
+ /* List of FIELD_DECLs associated with the PARM_DECLs of the copy
+ in copy out parameters. */
+ tree scalar_return_list = TYPE_CI_CO_LIST (gnu_subprog_type);
+ int length = list_length (scalar_return_list);
- type_annotate_only = (gigi_operating_mode == 1);
+ if (length > 1)
+ {
+ tree gnu_name;
+
+ gnu_subprog_call = save_expr (gnu_subprog_call);
+ gnu_name_list = nreverse (gnu_name_list);
+
+ /* If any of the names had side-effects, ensure they are all
+ evaluated before the call. */
+ for (gnu_name = gnu_name_list; gnu_name;
+ gnu_name = TREE_CHAIN (gnu_name))
+ if (TREE_SIDE_EFFECTS (TREE_VALUE (gnu_name)))
+ append_to_statement_list (TREE_VALUE (gnu_name),
+ &gnu_before_list);
+ }
- /* If we are just annotating types, give VOID_TYPE zero sizes to avoid
- errors. */
- if (type_annotate_only)
+ if (Nkind (Name (gnat_node)) == N_Explicit_Dereference)
+ gnat_formal = First_Formal_With_Extras (Etype (Name (gnat_node)));
+ else
+ gnat_formal = First_Formal_With_Extras (Entity (Name (gnat_node)));
+
+ for (gnat_actual = First_Actual (gnat_node);
+ Present (gnat_actual);
+ gnat_formal = Next_Formal_With_Extras (gnat_formal),
+ gnat_actual = Next_Actual (gnat_actual))
+ /* If we are dealing with a copy in copy out parameter, we must
+ retrieve its value from the record returned in the call. */
+ if (!(present_gnu_tree (gnat_formal)
+ && TREE_CODE (get_gnu_tree (gnat_formal)) == PARM_DECL
+ && (DECL_BY_REF_P (get_gnu_tree (gnat_formal))
+ || (TREE_CODE (get_gnu_tree (gnat_formal)) == PARM_DECL
+ && ((DECL_BY_COMPONENT_PTR_P (get_gnu_tree (gnat_formal))
+ || (DECL_BY_DESCRIPTOR_P
+ (get_gnu_tree (gnat_formal))))))))
+ && Ekind (gnat_formal) != E_In_Parameter)
+ {
+ /* Get the value to assign to this OUT or IN OUT parameter. It is
+ either the result of the function if there is only a single such
+ parameter or the appropriate field from the record returned. */
+ tree gnu_result
+ = length == 1 ? gnu_subprog_call
+ : build_component_ref (gnu_subprog_call, NULL_TREE,
+ TREE_PURPOSE (scalar_return_list),
+ false);
+
+ /* If the actual is a conversion, get the inner expression, which
+ will be the real destination, and convert the result to the
+ type of the actual parameter. */
+ tree gnu_actual
+ = maybe_unconstrained_array (TREE_VALUE (gnu_name_list));
+
+ /* If the result is a padded type, remove the padding. */
+ if (TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE
+ && TYPE_IS_PADDING_P (TREE_TYPE (gnu_result)))
+ gnu_result = convert (TREE_TYPE (TYPE_FIELDS
+ (TREE_TYPE (gnu_result))),
+ gnu_result);
+
+ /* If the actual is a type conversion, the real target object is
+ denoted by the inner Expression and we need to convert the
+ result to the associated type.
+
+ We also need to convert our gnu assignment target to this type
+ if the corresponding gnu_name was constructed from the GNAT
+ conversion node and not from the inner Expression. */
+ if (Nkind (gnat_actual) == N_Type_Conversion)
+ {
+ gnu_result
+ = convert_with_check
+ (Etype (Expression (gnat_actual)), gnu_result,
+ Do_Overflow_Check (gnat_actual),
+ Do_Range_Check (Expression (gnat_actual)),
+ Float_Truncate (gnat_actual));
+
+ if (!Is_Composite_Type
+ (Underlying_Type (Etype (gnat_formal))))
+ gnu_actual
+ = convert (TREE_TYPE (gnu_result), gnu_actual);
+ }
+
+ /* Unchecked conversions as actuals for out parameters are not
+ allowed in user code because they are not variables, but do
+ occur in front-end expansions. The associated gnu_name is
+ always obtained from the inner expression in such cases. */
+ else if (Nkind (gnat_actual) == N_Unchecked_Type_Conversion)
+ gnu_result = unchecked_convert (TREE_TYPE (gnu_actual),
+ gnu_result,
+ No_Truncation (gnat_actual));
+ else
+ {
+ if (Do_Range_Check (gnat_actual))
+ gnu_result = emit_range_check (gnu_result,
+ Etype (gnat_actual));
+
+ if (!(!TREE_CONSTANT (TYPE_SIZE (TREE_TYPE (gnu_actual)))
+ && TREE_CONSTANT (TYPE_SIZE (TREE_TYPE (gnu_result)))))
+ gnu_result = convert (TREE_TYPE (gnu_actual), gnu_result);
+ }
+
+ gnu_result = build_binary_op (MODIFY_EXPR, NULL_TREE,
+ gnu_actual, gnu_result);
+ annotate_with_node (gnu_result, gnat_actual);
+ append_to_statement_list (gnu_result, &gnu_before_list);
+ scalar_return_list = TREE_CHAIN (scalar_return_list);
+ gnu_name_list = TREE_CHAIN (gnu_name_list);
+ }
+ }
+ else
{
- TYPE_SIZE (void_type_node) = bitsize_zero_node;
- TYPE_SIZE_UNIT (void_type_node) = size_zero_node;
+ annotate_with_node (gnu_subprog_call, gnat_node);
+ append_to_statement_list (gnu_subprog_call, &gnu_before_list);
}
- /* See if we should discard file names in exception messages. */
- discard_file_names = Debug_Flag_NN;
+ append_to_statement_list (gnu_after_list, &gnu_before_list);
+ return gnu_before_list;
+}
+\f
+/* Subroutine of gnat_to_gnu to translate gnat_node, an
+ N_Handled_Sequence_Of_Statements, to a GCC tree, which is returned. */
- if (Nkind (gnat_root) != N_Compilation_Unit)
- gigi_abort (301);
+static tree
+Handled_Sequence_Of_Statements_to_gnu (Node_Id gnat_node)
+{
+ tree gnu_jmpsave_decl = NULL_TREE;
+ tree gnu_jmpbuf_decl = NULL_TREE;
+ /* If just annotating, ignore all EH and cleanups. */
+ bool gcc_zcx = (!type_annotate_only
+ && Present (Exception_Handlers (gnat_node))
+ && Exception_Mechanism == Back_End_Exceptions);
+ bool setjmp_longjmp
+ = (!type_annotate_only && Present (Exception_Handlers (gnat_node))
+ && Exception_Mechanism == Setjmp_Longjmp);
+ bool at_end = !type_annotate_only && Present (At_End_Proc (gnat_node));
+ bool binding_for_block = (at_end || gcc_zcx || setjmp_longjmp);
+ tree gnu_inner_block; /* The statement(s) for the block itself. */
+ tree gnu_result;
+ tree gnu_expr;
+ Node_Id gnat_temp;
- set_lineno (gnat_root, 0);
+ /* The GCC exception handling mechanism can handle both ZCX and SJLJ schemes
+ and we have our own SJLJ mechanism. To call the GCC mechanism, we call
+ add_cleanup, and when we leave the binding, end_stmt_group will create
+ the TRY_FINALLY_EXPR.
+
+ ??? The region level calls down there have been specifically put in place
+ for a ZCX context and currently the order in which things are emitted
+ (region/handlers) is different from the SJLJ case. Instead of putting
+ other calls with different conditions at other places for the SJLJ case,
+ it seems cleaner to reorder things for the SJLJ case and generalize the
+ condition to make it not ZCX specific.
+
+ If there are any exceptions or cleanup processing involved, we need an
+ outer statement group (for Setjmp_Longjmp) and binding level. */
+ if (binding_for_block)
+ {
+ start_stmt_group ();
+ gnat_pushlevel ();
+ }
- /* Initialize ourselves. */
- init_gnat_to_gnu ();
- init_dummy_type ();
- init_code_table ();
- gnat_compute_largest_alignment ();
+ /* If using setjmp_longjmp, make the variables for the setjmp buffer and save
+ area for address of previous buffer. Do this first since we need to have
+ the setjmp buf known for any decls in this block. */
+ if (setjmp_longjmp)
+ {
+ gnu_jmpsave_decl = create_var_decl (get_identifier ("JMPBUF_SAVE"),
+ NULL_TREE, jmpbuf_ptr_type,
+ build_call_0_expr (get_jmpbuf_decl),
+ false, false, false, false, NULL,
+ gnat_node);
+ DECL_ARTIFICIAL (gnu_jmpsave_decl) = 1;
+
+ /* The __builtin_setjmp receivers will immediately reinstall it. Now
+ because of the unstructured form of EH used by setjmp_longjmp, there
+ might be forward edges going to __builtin_setjmp receivers on which
+ it is uninitialized, although they will never be actually taken. */
+ TREE_NO_WARNING (gnu_jmpsave_decl) = 1;
+ gnu_jmpbuf_decl = create_var_decl (get_identifier ("JMP_BUF"),
+ NULL_TREE, jmpbuf_type,
+ NULL_TREE, false, false, false, false,
+ NULL, gnat_node);
+ DECL_ARTIFICIAL (gnu_jmpbuf_decl) = 1;
+
+ set_block_jmpbuf_decl (gnu_jmpbuf_decl);
+
+ /* When we exit this block, restore the saved value. */
+ add_cleanup (build_call_1_expr (set_jmpbuf_decl, gnu_jmpsave_decl),
+ End_Label (gnat_node));
+ }
- /* Enable GNAT stack checking method if needed */
- if (!Stack_Check_Probes_On_Target)
- set_stack_check_libfunc (gen_rtx_SYMBOL_REF (Pmode, "_gnat_stack_check"));
+ /* If we are to call a function when exiting this block, add a cleanup
+ to the binding level we made above. Note that add_cleanup is FIFO
+ so we must register this cleanup after the EH cleanup just above. */
+ if (at_end)
+ add_cleanup (build_call_0_expr (gnat_to_gnu (At_End_Proc (gnat_node))),
+ End_Label (gnat_node));
+
+ /* Now build the tree for the declarations and statements inside this block.
+ If this is SJLJ, set our jmp_buf as the current buffer. */
+ start_stmt_group ();
+
+ if (setjmp_longjmp)
+ add_stmt (build_call_1_expr (set_jmpbuf_decl,
+ build_unary_op (ADDR_EXPR, NULL_TREE,
+ gnu_jmpbuf_decl)));
+
+ if (Present (First_Real_Statement (gnat_node)))
+ process_decls (Statements (gnat_node), Empty,
+ First_Real_Statement (gnat_node), true, true);
+
+ /* Generate code for each statement in the block. */
+ for (gnat_temp = (Present (First_Real_Statement (gnat_node))
+ ? First_Real_Statement (gnat_node)
+ : First (Statements (gnat_node)));
+ Present (gnat_temp); gnat_temp = Next (gnat_temp))
+ add_stmt (gnat_to_gnu (gnat_temp));
+ gnu_inner_block = end_stmt_group ();
+
+ /* Now generate code for the two exception models, if either is relevant for
+ this block. */
+ if (setjmp_longjmp)
+ {
+ tree *gnu_else_ptr = 0;
+ tree gnu_handler;
+
+ /* Make a binding level for the exception handling declarations and code
+ and set up gnu_except_ptr_stack for the handlers to use. */
+ start_stmt_group ();
+ gnat_pushlevel ();
+
+ push_stack (&gnu_except_ptr_stack, NULL_TREE,
+ create_var_decl (get_identifier ("EXCEPT_PTR"),
+ NULL_TREE,
+ build_pointer_type (except_type_node),
+ build_call_0_expr (get_excptr_decl), false,
+ false, false, false, NULL, gnat_node));
+
+ /* Generate code for each handler. The N_Exception_Handler case does the
+ real work and returns a COND_EXPR for each handler, which we chain
+ together here. */
+ for (gnat_temp = First_Non_Pragma (Exception_Handlers (gnat_node));
+ Present (gnat_temp); gnat_temp = Next_Non_Pragma (gnat_temp))
+ {
+ gnu_expr = gnat_to_gnu (gnat_temp);
- /* Save the type we made for integer as the type for Standard.Integer.
- Then make the rest of the standard types. Note that some of these
- may be subtypes. */
- save_gnu_tree (Base_Type (standard_integer),
- TYPE_NAME (integer_type_node), 0);
+ /* If this is the first one, set it as the outer one. Otherwise,
+ point the "else" part of the previous handler to us. Then point
+ to our "else" part. */
+ if (!gnu_else_ptr)
+ add_stmt (gnu_expr);
+ else
+ *gnu_else_ptr = gnu_expr;
- gnu_except_ptr_stack = tree_cons (NULL_TREE, NULL_TREE, NULL_TREE);
+ gnu_else_ptr = &COND_EXPR_ELSE (gnu_expr);
+ }
- REAL_ARITHMETIC (dconstp5, RDIV_EXPR, dconst1, dconst2);
- REAL_ARITHMETIC (dconstmp5, RDIV_EXPR, dconstm1, dconst2);
+ /* If none of the exception handlers did anything, re-raise but do not
+ defer abortion. */
+ gnu_expr = build_call_1_expr (raise_nodefer_decl,
+ TREE_VALUE (gnu_except_ptr_stack));
+ annotate_with_node (gnu_expr, gnat_node);
- gnu_standard_long_long_float
- = gnat_to_gnu_entity (Base_Type (standard_long_long_float), NULL_TREE, 0);
- gnu_standard_exception_type
- = gnat_to_gnu_entity (Base_Type (standard_exception_type), NULL_TREE, 0);
+ if (gnu_else_ptr)
+ *gnu_else_ptr = gnu_expr;
+ else
+ add_stmt (gnu_expr);
+
+ /* End the binding level dedicated to the exception handlers and get the
+ whole statement group. */
+ pop_stack (&gnu_except_ptr_stack);
+ gnat_poplevel ();
+ gnu_handler = end_stmt_group ();
+
+ /* If the setjmp returns 1, we restore our incoming longjmp value and
+ then check the handlers. */
+ start_stmt_group ();
+ add_stmt_with_node (build_call_1_expr (set_jmpbuf_decl,
+ gnu_jmpsave_decl),
+ gnat_node);
+ add_stmt (gnu_handler);
+ gnu_handler = end_stmt_group ();
+
+ /* This block is now "if (setjmp) ... <handlers> else <block>". */
+ gnu_result = build3 (COND_EXPR, void_type_node,
+ (build_call_1_expr
+ (setjmp_decl,
+ build_unary_op (ADDR_EXPR, NULL_TREE,
+ gnu_jmpbuf_decl))),
+ gnu_handler, gnu_inner_block);
+ }
+ else if (gcc_zcx)
+ {
+ tree gnu_handlers;
- init_gigi_decls (gnu_standard_long_long_float, gnu_standard_exception_type);
+ /* First make a block containing the handlers. */
+ start_stmt_group ();
+ for (gnat_temp = First_Non_Pragma (Exception_Handlers (gnat_node));
+ Present (gnat_temp);
+ gnat_temp = Next_Non_Pragma (gnat_temp))
+ add_stmt (gnat_to_gnu (gnat_temp));
+ gnu_handlers = end_stmt_group ();
- /* Process any Pragma Ident for the main unit. */
-#ifdef ASM_OUTPUT_IDENT
- if (Present (Ident_String (Main_Unit)))
- ASM_OUTPUT_IDENT
- (asm_out_file,
- TREE_STRING_POINTER (gnat_to_gnu (Ident_String (Main_Unit))));
-#endif
+ /* Now make the TRY_CATCH_EXPR for the block. */
+ gnu_result = build2 (TRY_CATCH_EXPR, void_type_node,
+ gnu_inner_block, gnu_handlers);
+ }
+ else
+ gnu_result = gnu_inner_block;
- /* If we are using the GCC exception mechanism, let GCC know. */
- if (Exception_Mechanism == GCC_ZCX)
- gnat_init_gcc_eh ();
+ /* Now close our outer block, if we had to make one. */
+ if (binding_for_block)
+ {
+ add_stmt (gnu_result);
+ gnat_poplevel ();
+ gnu_result = end_stmt_group ();
+ }
- gnat_to_code (gnat_root);
+ return gnu_result;
}
-
\f
-/* This function is the driver of the GNAT to GCC tree transformation process.
- GNAT_NODE is the root of some gnat tree. It generates code for that
- part of the tree. */
+/* Subroutine of gnat_to_gnu to translate gnat_node, an N_Exception_Handler,
+ to a GCC tree, which is returned. This is the variant for Setjmp_Longjmp
+ exception handling. */
-void
-gnat_to_code (Node_Id gnat_node)
+static tree
+Exception_Handler_to_gnu_sjlj (Node_Id gnat_node)
{
- tree gnu_root;
+ /* Unless this is "Others" or the special "Non-Ada" exception for Ada, make
+ an "if" statement to select the proper exceptions. For "Others", exclude
+ exceptions where Handled_By_Others is nonzero unless the All_Others flag
+ is set. For "Non-ada", accept an exception if "Lang" is 'V'. */
+ tree gnu_choice = integer_zero_node;
+ tree gnu_body = build_stmt_group (Statements (gnat_node), false);
+ Node_Id gnat_temp;
- /* Save node number in case error */
- error_gnat_node = gnat_node;
+ for (gnat_temp = First (Exception_Choices (gnat_node));
+ gnat_temp; gnat_temp = Next (gnat_temp))
+ {
+ tree this_choice;
- gnu_root = tree_transform (gnat_node);
+ if (Nkind (gnat_temp) == N_Others_Choice)
+ {
+ if (All_Others (gnat_temp))
+ this_choice = integer_one_node;
+ else
+ this_choice
+ = build_binary_op
+ (EQ_EXPR, integer_type_node,
+ convert
+ (integer_type_node,
+ build_component_ref
+ (build_unary_op
+ (INDIRECT_REF, NULL_TREE,
+ TREE_VALUE (gnu_except_ptr_stack)),
+ get_identifier ("not_handled_by_others"), NULL_TREE,
+ false)),
+ integer_zero_node);
+ }
- /* If we return a statement, generate code for it. */
- if (IS_STMT (gnu_root))
- expand_expr_stmt (gnu_root);
+ else if (Nkind (gnat_temp) == N_Identifier
+ || Nkind (gnat_temp) == N_Expanded_Name)
+ {
+ Entity_Id gnat_ex_id = Entity (gnat_temp);
+ tree gnu_expr;
- /* This should just generate code, not return a value. If it returns
- a value, something is wrong. */
- else if (gnu_root != error_mark_node)
- gigi_abort (302);
-}
+ /* Exception may be a renaming. Recover original exception which is
+ the one elaborated and registered. */
+ if (Present (Renamed_Object (gnat_ex_id)))
+ gnat_ex_id = Renamed_Object (gnat_ex_id);
-/* GNAT_NODE is the root of some GNAT tree. Return the root of the GCC
- tree corresponding to that GNAT tree. Normally, no code is generated.
- We just return an equivalent tree which is used elsewhere to generate
- code. */
+ gnu_expr = gnat_to_gnu_entity (gnat_ex_id, NULL_TREE, 0);
-tree
-gnat_to_gnu (Node_Id gnat_node)
-{
- tree gnu_root;
- bool made_sequence = false;
-
- /* We support the use of this on statements now as a transition
- to full function-at-a-time processing. So we need to see if anything
- we do generates RTL and returns error_mark_node. */
- if (!global_bindings_p ())
- {
- start_sequence ();
- emit_note (NOTE_INSN_DELETED);
- made_sequence = true;
+ this_choice
+ = build_binary_op
+ (EQ_EXPR, integer_type_node, TREE_VALUE (gnu_except_ptr_stack),
+ convert (TREE_TYPE (TREE_VALUE (gnu_except_ptr_stack)),
+ build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr)));
+
+ /* If this is the distinguished exception "Non_Ada_Error" (and we are
+ in VMS mode), also allow a non-Ada exception (a VMS condition) t
+ match. */
+ if (Is_Non_Ada_Error (Entity (gnat_temp)))
+ {
+ tree gnu_comp
+ = build_component_ref
+ (build_unary_op (INDIRECT_REF, NULL_TREE,
+ TREE_VALUE (gnu_except_ptr_stack)),
+ get_identifier ("lang"), NULL_TREE, false);
+
+ this_choice
+ = build_binary_op
+ (TRUTH_ORIF_EXPR, integer_type_node,
+ build_binary_op (EQ_EXPR, integer_type_node, gnu_comp,
+ build_int_cst (TREE_TYPE (gnu_comp), 'V')),
+ this_choice);
+ }
+ }
+ else
+ gcc_unreachable ();
+
+ gnu_choice = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
+ gnu_choice, this_choice);
}
- /* Save node number in case error */
- error_gnat_node = gnat_node;
+ return build3 (COND_EXPR, void_type_node, gnu_choice, gnu_body, NULL_TREE);
+}
+\f
+/* Subroutine of gnat_to_gnu to translate gnat_node, an N_Exception_Handler,
+ to a GCC tree, which is returned. This is the variant for ZCX. */
+
+static tree
+Exception_Handler_to_gnu_zcx (Node_Id gnat_node)
+{
+ tree gnu_etypes_list = NULL_TREE;
+ tree gnu_expr;
+ tree gnu_etype;
+ tree gnu_current_exc_ptr;
+ tree gnu_incoming_exc_ptr;
+ Node_Id gnat_temp;
- gnu_root = tree_transform (gnat_node);
+ /* We build a TREE_LIST of nodes representing what exception types this
+ handler can catch, with special cases for others and all others cases.
- if (gnu_root == error_mark_node)
+ Each exception type is actually identified by a pointer to the exception
+ id, or to a dummy object for "others" and "all others".
+
+ Care should be taken to ensure that the control flow impact of "others"
+ and "all others" is known to GCC. lang_eh_type_covers is doing the trick
+ currently. */
+ for (gnat_temp = First (Exception_Choices (gnat_node));
+ gnat_temp; gnat_temp = Next (gnat_temp))
{
- if (!made_sequence)
+ if (Nkind (gnat_temp) == N_Others_Choice)
{
- if (type_annotate_only)
- return gnu_root;
- else
- gigi_abort (303);
+ tree gnu_expr
+ = All_Others (gnat_temp) ? all_others_decl : others_decl;
+
+ gnu_etype
+ = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr);
}
+ else if (Nkind (gnat_temp) == N_Identifier
+ || Nkind (gnat_temp) == N_Expanded_Name)
+ {
+ Entity_Id gnat_ex_id = Entity (gnat_temp);
- gnu_root = make_expr_stmt_from_rtl (first_nondeleted_insn (get_insns ()),
- gnat_node);
- end_sequence ();
+ /* Exception may be a renaming. Recover original exception which is
+ the one elaborated and registered. */
+ if (Present (Renamed_Object (gnat_ex_id)))
+ gnat_ex_id = Renamed_Object (gnat_ex_id);
+
+ gnu_expr = gnat_to_gnu_entity (gnat_ex_id, NULL_TREE, 0);
+ gnu_etype = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr);
+
+ /* The Non_Ada_Error case for VMS exceptions is handled
+ by the personality routine. */
+ }
+ else
+ gcc_unreachable ();
+
+ /* The GCC interface expects NULL to be passed for catch all handlers, so
+ it would be quite tempting to set gnu_etypes_list to NULL if gnu_etype
+ is integer_zero_node. It would not work, however, because GCC's
+ notion of "catch all" is stronger than our notion of "others". Until
+ we correctly use the cleanup interface as well, doing that would
+ prevent the "all others" handlers from being seen, because nothing
+ can be caught beyond a catch all from GCC's point of view. */
+ gnu_etypes_list = tree_cons (NULL_TREE, gnu_etype, gnu_etypes_list);
}
- else if (made_sequence)
+
+ start_stmt_group ();
+ gnat_pushlevel ();
+
+ /* Expand a call to the begin_handler hook at the beginning of the handler,
+ and arrange for a call to the end_handler hook to occur on every possible
+ exit path.
+
+ The hooks expect a pointer to the low level occurrence. This is required
+ for our stack management scheme because a raise inside the handler pushes
+ a new occurrence on top of the stack, which means that this top does not
+ necessarily match the occurrence this handler was dealing with.
+
+ The EXC_PTR_EXPR object references the exception occurrence being
+ propagated. Upon handler entry, this is the exception for which the
+ handler is triggered. This might not be the case upon handler exit,
+ however, as we might have a new occurrence propagated by the handler's
+ body, and the end_handler hook called as a cleanup in this context.
+
+ We use a local variable to retrieve the incoming value at handler entry
+ time, and reuse it to feed the end_handler hook's argument at exit. */
+ gnu_current_exc_ptr = build0 (EXC_PTR_EXPR, ptr_type_node);
+ gnu_incoming_exc_ptr = create_var_decl (get_identifier ("EXPTR"), NULL_TREE,
+ ptr_type_node, gnu_current_exc_ptr,
+ false, false, false, false, NULL,
+ gnat_node);
+
+ add_stmt_with_node (build_call_1_expr (begin_handler_decl,
+ gnu_incoming_exc_ptr),
+ gnat_node);
+ /* ??? We don't seem to have an End_Label at hand to set the location. */
+ add_cleanup (build_call_1_expr (end_handler_decl, gnu_incoming_exc_ptr),
+ Empty);
+ add_stmt_list (Statements (gnat_node));
+ gnat_poplevel ();
+
+ return build2 (CATCH_EXPR, void_type_node, gnu_etypes_list,
+ end_stmt_group ());
+}
+\f
+/* Subroutine of gnat_to_gnu to generate code for an N_Compilation unit. */
+
+static void
+Compilation_Unit_to_gnu (Node_Id gnat_node)
+{
+ /* Make the decl for the elaboration procedure. */
+ bool body_p = (Defining_Entity (Unit (gnat_node)),
+ Nkind (Unit (gnat_node)) == N_Package_Body
+ || Nkind (Unit (gnat_node)) == N_Subprogram_Body);
+ Entity_Id gnat_unit_entity = Defining_Entity (Unit (gnat_node));
+ tree gnu_elab_proc_decl
+ = create_subprog_decl
+ (create_concat_name (gnat_unit_entity,
+ body_p ? "elabb" : "elabs"),
+ NULL_TREE, void_ftype, NULL_TREE, false, true, false, NULL,
+ gnat_unit_entity);
+ struct elab_info *info;
+
+ push_stack (&gnu_elab_proc_stack, NULL_TREE, gnu_elab_proc_decl);
+
+ DECL_ELABORATION_PROC_P (gnu_elab_proc_decl) = 1;
+ allocate_struct_function (gnu_elab_proc_decl);
+ Sloc_to_locus (Sloc (gnat_unit_entity), &cfun->function_end_locus);
+ set_cfun (NULL);
+
+ /* For a body, first process the spec if there is one. */
+ if (Nkind (Unit (gnat_node)) == N_Package_Body
+ || (Nkind (Unit (gnat_node)) == N_Subprogram_Body
+ && !Acts_As_Spec (gnat_node)))
{
- rtx insns = first_nondeleted_insn (get_insns ());
+ add_stmt (gnat_to_gnu (Library_Unit (gnat_node)));
+ finalize_from_with_types ();
+ }
- end_sequence ();
+ process_inlined_subprograms (gnat_node);
- if (insns)
- {
- /* If we have a statement, we need to first evaluate any RTL we
- made in the process of building it and then the statement. */
- if (IS_STMT (gnu_root))
- {
- tree gnu_expr_stmt = make_expr_stmt_from_rtl (insns, gnat_node);
+ if (type_annotate_only && gnat_node == Cunit (Main_Unit))
+ {
+ elaborate_all_entities (gnat_node);
- TREE_CHAIN (gnu_expr_stmt) = gnu_root;
- gnu_root = build_nt (BLOCK_STMT, gnu_expr_stmt);
- TREE_TYPE (gnu_root) = void_type_node;
- TREE_SLOC (gnu_root) = Sloc (gnat_node);
- }
- else
- emit_insn (insns);
- }
+ if (Nkind (Unit (gnat_node)) == N_Subprogram_Declaration
+ || Nkind (Unit (gnat_node)) == N_Generic_Package_Declaration
+ || Nkind (Unit (gnat_node)) == N_Generic_Subprogram_Declaration)
+ return;
}
- return gnu_root;
+ process_decls (Declarations (Aux_Decls_Node (gnat_node)), Empty, Empty,
+ true, true);
+ add_stmt (gnat_to_gnu (Unit (gnat_node)));
+
+ /* Process any pragmas and actions following the unit. */
+ add_stmt_list (Pragmas_After (Aux_Decls_Node (gnat_node)));
+ add_stmt_list (Actions (Aux_Decls_Node (gnat_node)));
+ finalize_from_with_types ();
+
+ /* Save away what we've made so far and record this potential elaboration
+ procedure. */
+ info = (struct elab_info *) ggc_alloc (sizeof (struct elab_info));
+ set_current_block_context (gnu_elab_proc_decl);
+ gnat_poplevel ();
+ DECL_SAVED_TREE (gnu_elab_proc_decl) = end_stmt_group ();
+ info->next = elab_info_list;
+ info->elab_proc = gnu_elab_proc_decl;
+ info->gnat_node = gnat_node;
+ elab_info_list = info;
+
+ /* Generate elaboration code for this unit, if necessary, and say whether
+ we did or not. */
+ pop_stack (&gnu_elab_proc_stack);
+
+ /* Invalidate the global renaming pointers. This is necessary because
+ stabilization of the renamed entities may create SAVE_EXPRs which
+ have been tied to a specific elaboration routine just above. */
+ invalidate_global_renaming_pointers ();
}
\f
-/* This function is the driver of the GNAT to GCC tree transformation process.
- It is the entry point of the tree transformer. GNAT_NODE is the root of
- some GNAT tree. Return the root of the corresponding GCC tree or
- error_mark_node to signal that there is no GCC tree to return.
-
- The latter is the case if only code generation actions have to be performed
- like in the case of if statements, loops, etc. This routine is wrapped
- in the above two routines for most purposes. */
+/* This function is the driver of the GNAT to GCC tree transformation
+ process. It is the entry point of the tree transformer. GNAT_NODE is the
+ root of some GNAT tree. Return the root of the corresponding GCC tree.
+ If this is an expression, return the GCC equivalent of the expression. If
+ it is a statement, return the statement. In the case when called for a
+ statement, it may also add statements to the current statement group, in
+ which case anything it returns is to be interpreted as occurring after
+ anything `it already added. */
-static tree
-tree_transform (Node_Id gnat_node)
+tree
+gnat_to_gnu (Node_Id gnat_node)
{
+ bool went_into_elab_proc = false;
tree gnu_result = error_mark_node; /* Default to no value. */
tree gnu_result_type = void_type_node;
tree gnu_expr;
tree gnu_lhs, gnu_rhs;
Node_Id gnat_temp;
- Entity_Id gnat_temp_type;
-
- /* Set input_file_name and lineno from the Sloc in the GNAT tree. */
- set_lineno (gnat_node, 0);
-
- if (IN (Nkind (gnat_node), N_Statement_Other_Than_Procedure_Call)
- && type_annotate_only)
- return error_mark_node;
-
- /* If this is a Statement and we are at top level, we add the statement
- as an elaboration for a null tree. That will cause it to be placed
- in the elaboration procedure. */
- if (global_bindings_p ()
- && ((IN (Nkind (gnat_node), N_Statement_Other_Than_Procedure_Call)
- && Nkind (gnat_node) != N_Null_Statement)
- || Nkind (gnat_node) == N_Procedure_Call_Statement
- || Nkind (gnat_node) == N_Label
- || (Nkind (gnat_node) == N_Handled_Sequence_Of_Statements
- && (Present (Exception_Handlers (gnat_node))
- || Present (At_End_Proc (gnat_node))))
- || ((Nkind (gnat_node) == N_Raise_Constraint_Error
- || Nkind (gnat_node) == N_Raise_Storage_Error
- || Nkind (gnat_node) == N_Raise_Program_Error)
- && (Ekind (Etype (gnat_node)) == E_Void))))
- {
- add_pending_elaborations (NULL_TREE, make_transform_expr (gnat_node));
- return error_mark_node;
- }
+ /* Save node number for error message and set location information. */
+ error_gnat_node = gnat_node;
+ Sloc_to_locus (Sloc (gnat_node), &input_location);
- /* If this node is a non-static subexpression and we are only
- annotating types, make this into a NULL_EXPR for non-VOID types
- and error_mark_node for void return types. But allow
- N_Identifier since we use it for lots of things, including
- getting trees for discriminants. */
+ if (type_annotate_only
+ && IN (Nkind (gnat_node), N_Statement_Other_Than_Procedure_Call))
+ return alloc_stmt_list ();
+ /* If this node is a non-static subexpression and we are only
+ annotating types, make this into a NULL_EXPR. */
if (type_annotate_only
&& IN (Nkind (gnat_node), N_Subexpr)
&& Nkind (gnat_node) != N_Identifier
- && ! Compile_Time_Known_Value (gnat_node))
+ && !Compile_Time_Known_Value (gnat_node))
+ return build1 (NULL_EXPR, get_unpadded_type (Etype (gnat_node)),
+ build_call_raise (CE_Range_Check_Failed, gnat_node,
+ N_Raise_Constraint_Error));
+
+ /* If this is a Statement and we are at top level, it must be part of the
+ elaboration procedure, so mark us as being in that procedure and push our
+ context.
+
+ If we are in the elaboration procedure, check if we are violating a a
+ No_Elaboration_Code restriction by having a statement there. */
+ if ((IN (Nkind (gnat_node), N_Statement_Other_Than_Procedure_Call)
+ && Nkind (gnat_node) != N_Null_Statement)
+ || Nkind (gnat_node) == N_Procedure_Call_Statement
+ || Nkind (gnat_node) == N_Label
+ || Nkind (gnat_node) == N_Implicit_Label_Declaration
+ || Nkind (gnat_node) == N_Handled_Sequence_Of_Statements
+ || ((Nkind (gnat_node) == N_Raise_Constraint_Error
+ || Nkind (gnat_node) == N_Raise_Storage_Error
+ || Nkind (gnat_node) == N_Raise_Program_Error)
+ && (Ekind (Etype (gnat_node)) == E_Void)))
{
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
+ if (!current_function_decl)
+ {
+ current_function_decl = TREE_VALUE (gnu_elab_proc_stack);
+ start_stmt_group ();
+ gnat_pushlevel ();
+ went_into_elab_proc = true;
+ }
- if (TREE_CODE (gnu_result_type) == VOID_TYPE)
- return error_mark_node;
- else
- return build1 (NULL_EXPR, gnu_result_type,
- build_call_raise (CE_Range_Check_Failed));
+ /* Don't check for a possible No_Elaboration_Code restriction violation
+ on N_Handled_Sequence_Of_Statements, as we want to signal an error on
+ every nested real statement instead. This also avoids triggering
+ spurious errors on dummy (empty) sequences created by the front-end
+ for package bodies in some cases. */
+
+ if (current_function_decl == TREE_VALUE (gnu_elab_proc_stack)
+ && Nkind (gnat_node) != N_Handled_Sequence_Of_Statements)
+ Check_Elaboration_Code_Allowed (gnat_node);
}
switch (Nkind (gnat_node))
case N_Expanded_Name:
case N_Operator_Symbol:
case N_Defining_Identifier:
-
- /* If the Etype of this node does not equal the Etype of the
- Entity, something is wrong with the entity map, probably in
- generic instantiation. However, this does not apply to
- types. Since we sometime have strange Ekind's, just do
- this test for objects. Also, if the Etype of the Entity is
- private, the Etype of the N_Identifier is allowed to be the full
- type and also we consider a packed array type to be the same as
- the original type. Similarly, a class-wide type is equivalent
- to a subtype of itself. Finally, if the types are Itypes,
- one may be a copy of the other, which is also legal. */
-
- gnat_temp = (Nkind (gnat_node) == N_Defining_Identifier
- ? gnat_node : Entity (gnat_node));
- gnat_temp_type = Etype (gnat_temp);
-
- if (Etype (gnat_node) != gnat_temp_type
- && ! (Is_Packed (gnat_temp_type)
- && Etype (gnat_node) == Packed_Array_Type (gnat_temp_type))
- && ! (Is_Class_Wide_Type (Etype (gnat_node)))
- && ! (IN (Ekind (gnat_temp_type), Private_Kind)
- && Present (Full_View (gnat_temp_type))
- && ((Etype (gnat_node) == Full_View (gnat_temp_type))
- || (Is_Packed (Full_View (gnat_temp_type))
- && Etype (gnat_node) ==
- Packed_Array_Type (Full_View (gnat_temp_type)))))
- && (!Is_Itype (Etype (gnat_node)) || !Is_Itype (gnat_temp_type))
- && (Ekind (gnat_temp) == E_Variable
- || Ekind (gnat_temp) == E_Component
- || Ekind (gnat_temp) == E_Constant
- || Ekind (gnat_temp) == E_Loop_Parameter
- || IN (Ekind (gnat_temp), Formal_Kind)))
- gigi_abort (304);
-
- /* If this is a reference to a deferred constant whose partial view
- is an unconstrained private type, the proper type is on the full
- view of the constant, not on the full view of the type, which may
- be unconstrained.
-
- This may be a reference to a type, for example in the prefix of the
- attribute Position, generated for dispatching code (see Make_DT in
- exp_disp,adb). In that case we need the type itself, not is parent,
- in particular if it is a derived type */
-
- if (Is_Private_Type (gnat_temp_type)
- && Has_Unknown_Discriminants (gnat_temp_type)
- && Present (Full_View (gnat_temp))
- && ! Is_Type (gnat_temp))
- {
- gnat_temp = Full_View (gnat_temp);
- gnat_temp_type = Etype (gnat_temp);
- gnu_result_type = get_unpadded_type (gnat_temp_type);
- }
- else
- {
- /* Expand the type of this identitier first, in case it is
- an enumeral literal, which only get made when the type
- is expanded. There is no order-of-elaboration issue here.
- We want to use the Actual_Subtype if it has already been
- elaborated, otherwise the Etype. Avoid using Actual_Subtype
- for packed arrays to simplify things. */
- if ((Ekind (gnat_temp) == E_Constant
- || Ekind (gnat_temp) == E_Variable || Is_Formal (gnat_temp))
- && ! (Is_Array_Type (Etype (gnat_temp))
- && Present (Packed_Array_Type (Etype (gnat_temp))))
- && Present (Actual_Subtype (gnat_temp))
- && present_gnu_tree (Actual_Subtype (gnat_temp)))
- gnat_temp_type = Actual_Subtype (gnat_temp);
- else
- gnat_temp_type = Etype (gnat_node);
-
- gnu_result_type = get_unpadded_type (gnat_temp_type);
- }
-
- gnu_result = gnat_to_gnu_entity (gnat_temp, NULL_TREE, 0);
-
- /* If we are in an exception handler, force this variable into memory
- to ensure optimization does not remove stores that appear
- redundant but are actually needed in case an exception occurs.
-
- ??? Note that we need not do this if the variable is declared within
- the handler, only if it is referenced in the handler and declared
- in an enclosing block, but we have no way of testing that
- right now. */
- if (TREE_VALUE (gnu_except_ptr_stack) != 0)
- {
- gnat_mark_addressable (gnu_result);
- flush_addressof (gnu_result);
- }
-
- /* Some objects (such as parameters passed by reference, globals of
- variable size, and renamed objects) actually represent the address
- of the object. In that case, we must do the dereference. Likewise,
- deal with parameters to foreign convention subprograms. Call fold
- here since GNU_RESULT may be a CONST_DECL. */
- if (DECL_P (gnu_result)
- && (DECL_BY_REF_P (gnu_result)
- || (TREE_CODE (gnu_result) == PARM_DECL
- && DECL_BY_COMPONENT_PTR_P (gnu_result))))
- {
- int ro = DECL_POINTS_TO_READONLY_P (gnu_result);
-
- if (TREE_CODE (gnu_result) == PARM_DECL
- && DECL_BY_COMPONENT_PTR_P (gnu_result))
- gnu_result = convert (build_pointer_type (gnu_result_type),
- gnu_result);
-
- gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE,
- fold (gnu_result));
- TREE_READONLY (gnu_result) = TREE_STATIC (gnu_result) = ro;
- }
-
- /* The GNAT tree has the type of a function as the type of its result.
- Also use the type of the result if the Etype is a subtype which
- is nominally unconstrained. But remove any padding from the
- resulting type. */
- if (TREE_CODE (TREE_TYPE (gnu_result)) == FUNCTION_TYPE
- || Is_Constr_Subt_For_UN_Aliased (gnat_temp_type))
- {
- gnu_result_type = TREE_TYPE (gnu_result);
- if (TREE_CODE (gnu_result_type) == RECORD_TYPE
- && TYPE_IS_PADDING_P (gnu_result_type))
- gnu_result_type = TREE_TYPE (TYPE_FIELDS (gnu_result_type));
- }
-
- /* We always want to return the underlying INTEGER_CST for an
- enumeration literal to avoid the need to call fold in lots
- of places. But don't do this is the parent will be taking
- the address of this object. */
- if (TREE_CODE (gnu_result) == CONST_DECL)
- {
- gnat_temp = Parent (gnat_node);
- if (DECL_CONST_CORRESPONDING_VAR (gnu_result) == 0
- || (Nkind (gnat_temp) != N_Reference
- && ! (Nkind (gnat_temp) == N_Attribute_Reference
- && ((Get_Attribute_Id (Attribute_Name (gnat_temp))
- == Attr_Address)
- || (Get_Attribute_Id (Attribute_Name (gnat_temp))
- == Attr_Access)
- || (Get_Attribute_Id (Attribute_Name (gnat_temp))
- == Attr_Unchecked_Access)
- || (Get_Attribute_Id (Attribute_Name (gnat_temp))
- == Attr_Unrestricted_Access)))))
- gnu_result = DECL_INITIAL (gnu_result);
- }
+ gnu_result = Identifier_to_gnu (gnat_node, &gnu_result_type);
break;
case N_Integer_Literal:
tree gnu_type;
/* Get the type of the result, looking inside any padding and
- left-justified modular types. Then get the value in that type. */
+ justified modular types. Then get the value in that type. */
gnu_type = gnu_result_type = get_unpadded_type (Etype (gnat_node));
if (TREE_CODE (gnu_type) == RECORD_TYPE
- && TYPE_LEFT_JUSTIFIED_MODULAR_P (gnu_type))
+ && TYPE_JUSTIFIED_MODULAR_P (gnu_type))
gnu_type = TREE_TYPE (TYPE_FIELDS (gnu_type));
gnu_result = UI_To_gnu (Intval (gnat_node), gnu_type);
of the subtype, but that causes problems with subtypes whose usage
will raise Constraint_Error and with biased representation, so
we don't. */
- if (TREE_CONSTANT_OVERFLOW (gnu_result))
- gigi_abort (305);
+ gcc_assert (!TREE_OVERFLOW (gnu_result));
}
break;
if (Present (Entity (gnat_node)))
gnu_result = DECL_INITIAL (get_gnu_tree (Entity (gnat_node)));
else
- gnu_result = convert (gnu_result_type,
- build_int_2 (Char_Literal_Value (gnat_node), 0));
+ gnu_result
+ = build_int_cst_type
+ (gnu_result_type, UI_To_CC (Char_Literal_Value (gnat_node)));
break;
case N_Real_Literal:
gnu_result_type = get_unpadded_type (Etype (gnat_node));
gnu_result = UI_To_gnu (Corresponding_Integer_Value (gnat_node),
gnu_result_type);
- if (TREE_CONSTANT_OVERFLOW (gnu_result))
- gigi_abort (305);
+ gcc_assert (!TREE_OVERFLOW (gnu_result));
}
/* We should never see a Vax_Float type literal, since the front end
is supposed to transform these using appropriate conversions */
else if (Vax_Float (Underlying_Type (Etype (gnat_node))))
- gigi_abort (334);
+ gcc_unreachable ();
else
{
gnu_result = convert (gnu_result_type, integer_zero_node);
else
{
- if (! Is_Machine_Number (gnat_node))
+ if (!Is_Machine_Number (gnat_node))
ur_realval
= Machine (Base_Type (Underlying_Type (Etype (gnat_node))),
ur_realval, Round_Even, gnat_node);
Otherwise, the base must be 2 and we scale the value, which
we know can fit in the mantissa of the type (hence the use
of that type above). */
- if (Rbase (ur_realval) == 0)
+ if (No (Rbase (ur_realval)))
gnu_result
= build_binary_op (RDIV_EXPR,
get_base_type (gnu_result_type),
gnu_result,
UI_To_gnu (Denominator (ur_realval),
gnu_result_type));
- else if (Rbase (ur_realval) != 2)
- gigi_abort (336);
-
else
{
REAL_VALUE_TYPE tmp;
+ gcc_assert (Rbase (ur_realval) == 2);
real_ldexp (&tmp, &TREE_REAL_CST (gnu_result),
- UI_To_Int (Denominator (ur_realval)));
gnu_result = build_real (gnu_result_type, tmp);
gnu_result_type = get_unpadded_type (Etype (gnat_node));
if (TYPE_PRECISION (TREE_TYPE (gnu_result_type)) == HOST_BITS_PER_CHAR)
{
- /* We assume here that all strings are of type standard.string.
- "Weird" types of string have been converted to an aggregate
- by the expander. */
String_Id gnat_string = Strval (gnat_node);
int length = String_Length (gnat_string);
- char *string = (char *) alloca (length + 1);
int i;
+ char *string;
+ if (length >= ALLOCA_THRESHOLD)
+ string = xmalloc (length + 1); /* in case of large strings */
+ else
+ string = (char *) alloca (length + 1);
/* Build the string with the characters in the literal. Note
that Ada strings are 1-origin. */
/* Strings in GCC don't normally have types, but we want
this to not be converted to the array type. */
TREE_TYPE (gnu_result) = gnu_result_type;
+
+ if (length >= ALLOCA_THRESHOLD) /* free if heap-allocated */
+ free (string);
}
else
{
int length = String_Length (gnat_string);
int i;
tree gnu_list = NULL_TREE;
+ tree gnu_idx = TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_result_type));
for (i = 0; i < length; i++)
- gnu_list
- = tree_cons (NULL_TREE,
- convert (TREE_TYPE (gnu_result_type),
- build_int_2 (Get_String_Char (gnat_string,
- i + 1),
- 0)),
- gnu_list);
+ {
+ gnu_list
+ = tree_cons (gnu_idx,
+ build_int_cst (TREE_TYPE (gnu_result_type),
+ Get_String_Char (gnat_string,
+ i + 1)),
+ gnu_list);
+
+ gnu_idx = int_const_binop (PLUS_EXPR, gnu_idx, integer_one_node,
+ 0);
+ }
gnu_result
= gnat_build_constructor (gnu_result_type, nreverse (gnu_list));
break;
case N_Pragma:
- if (type_annotate_only)
- break;
-
- /* Check for (and ignore) unrecognized pragma */
- if (! Is_Pragma_Name (Chars (gnat_node)))
- break;
-
- switch (Get_Pragma_Id (Chars (gnat_node)))
- {
- case Pragma_Inspection_Point:
- /* Do nothing at top level: all such variables are already
- viewable. */
- if (global_bindings_p ())
- break;
-
- set_lineno (gnat_node, 1);
- for (gnat_temp = First (Pragma_Argument_Associations (gnat_node));
- Present (gnat_temp);
- gnat_temp = Next (gnat_temp))
- {
- gnu_expr = gnat_to_gnu (Expression (gnat_temp));
- if (TREE_CODE (gnu_expr) == UNCONSTRAINED_ARRAY_REF)
- gnu_expr = TREE_OPERAND (gnu_expr, 0);
-
- gnu_expr = build1 (USE_EXPR, void_type_node, gnu_expr);
- TREE_SIDE_EFFECTS (gnu_expr) = 1;
- expand_expr_stmt (gnu_expr);
- }
- break;
-
- case Pragma_Optimize:
- switch (Chars (Expression
- (First (Pragma_Argument_Associations (gnat_node)))))
- {
- case Name_Time: case Name_Space:
- if (optimize == 0)
- post_error ("insufficient -O value?", gnat_node);
- break;
-
- case Name_Off:
- if (optimize != 0)
- post_error ("must specify -O0?", gnat_node);
- break;
-
- default:
- gigi_abort (331);
- break;
- }
- break;
-
- case Pragma_Reviewable:
- if (write_symbols == NO_DEBUG)
- post_error ("must specify -g?", gnat_node);
- break;
- }
+ gnu_result = Pragma_to_gnu (gnat_node);
break;
/**************************************/
case N_Private_Extension_Declaration:
case N_Task_Type_Declaration:
process_type (Defining_Entity (gnat_node));
+ gnu_result = alloc_stmt_list ();
break;
case N_Object_Declaration:
case N_Exception_Declaration:
gnat_temp = Defining_Entity (gnat_node);
+ gnu_result = alloc_stmt_list ();
/* If we are just annotating types and this object has an unconstrained
or task type, don't elaborate it. */
if (type_annotate_only
&& (((Is_Array_Type (Etype (gnat_temp))
|| Is_Record_Type (Etype (gnat_temp)))
- && ! Is_Constrained (Etype (gnat_temp)))
+ && !Is_Constrained (Etype (gnat_temp)))
|| Is_Concurrent_Type (Etype (gnat_temp))))
break;
if (Present (Expression (gnat_node))
- && ! (Nkind (gnat_node) == N_Object_Declaration
- && No_Initialization (gnat_node))
- && (! type_annotate_only
+ && !(Nkind (gnat_node) == N_Object_Declaration
+ && No_Initialization (gnat_node))
+ && (!type_annotate_only
|| Compile_Time_Known_Value (Expression (gnat_node))))
{
gnu_expr = gnat_to_gnu (Expression (gnat_node));
if (Present (Freeze_Node (gnat_temp)))
{
if ((Is_Public (gnat_temp) || global_bindings_p ())
- && ! TREE_CONSTANT (gnu_expr))
+ && !TREE_CONSTANT (gnu_expr))
gnu_expr
= create_var_decl (create_concat_name (gnat_temp, "init"),
- NULL_TREE, TREE_TYPE (gnu_expr), gnu_expr,
- 0, Is_Public (gnat_temp), 0, 0, 0);
+ NULL_TREE, TREE_TYPE (gnu_expr),
+ gnu_expr, false, Is_Public (gnat_temp),
+ false, false, NULL, gnat_temp);
else
- gnu_expr = maybe_variable (gnu_expr, Expression (gnat_node));
+ gnu_expr = maybe_variable (gnu_expr);
- save_gnu_tree (gnat_node, gnu_expr, 1);
+ save_gnu_tree (gnat_node, gnu_expr, true);
}
}
else
- gnu_expr = 0;
+ gnu_expr = NULL_TREE;
- if (type_annotate_only && gnu_expr != 0
- && TREE_CODE (gnu_expr) == ERROR_MARK)
- gnu_expr = 0;
+ if (type_annotate_only && gnu_expr && TREE_CODE (gnu_expr) == ERROR_MARK)
+ gnu_expr = NULL_TREE;
if (No (Freeze_Node (gnat_temp)))
gnat_to_gnu_entity (gnat_temp, gnu_expr, 1);
break;
case N_Object_Renaming_Declaration:
-
gnat_temp = Defining_Entity (gnat_node);
- /* Don't do anything if this renaming is handled by the front end.
- or if we are just annotating types and this object has a
- composite or task type, don't elaborate it. */
- if (! Is_Renaming_Of_Object (gnat_temp)
+ /* Don't do anything if this renaming is handled by the front end or if
+ we are just annotating types and this object has a composite or task
+ type, don't elaborate it. We return the result in case it has any
+ SAVE_EXPRs in it that need to be evaluated here. */
+ if (!Is_Renaming_Of_Object (gnat_temp)
&& ! (type_annotate_only
&& (Is_Array_Type (Etype (gnat_temp))
|| Is_Record_Type (Etype (gnat_temp))
|| Is_Concurrent_Type (Etype (gnat_temp)))))
- {
- gnu_expr = gnat_to_gnu (Renamed_Object (gnat_temp));
- gnat_to_gnu_entity (gnat_temp, gnu_expr, 1);
- }
+ gnu_result
+ = gnat_to_gnu_entity (gnat_temp,
+ gnat_to_gnu (Renamed_Object (gnat_temp)), 1);
+ else
+ gnu_result = alloc_stmt_list ();
break;
case N_Implicit_Label_Declaration:
gnat_to_gnu_entity (Defining_Entity (gnat_node), NULL_TREE, 1);
+ gnu_result = alloc_stmt_list ();
break;
case N_Exception_Renaming_Declaration:
case N_Package_Renaming_Declaration:
case N_Subprogram_Renaming_Declaration:
/* These are fully handled in the front end. */
+ gnu_result = alloc_stmt_list ();
break;
/*************************************/
for (i = 0, gnu_type = TREE_TYPE (gnu_array_object);
i < ndim; i++, gnu_type = TREE_TYPE (gnu_type))
{
- if (TREE_CODE (gnu_type) != ARRAY_TYPE)
- gigi_abort (307);
-
+ gcc_assert (TREE_CODE (gnu_type) == ARRAY_TYPE);
gnat_temp = gnat_expr_array[i];
gnu_expr = gnat_to_gnu (gnat_temp);
case N_Slice:
{
- tree gnu_type;
- Node_Id gnat_range_node = Discrete_Range (gnat_node);
+ tree gnu_type;
+ Node_Id gnat_range_node = Discrete_Range (gnat_node);
- gnu_result = gnat_to_gnu (Prefix (gnat_node));
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
+ gnu_result = gnat_to_gnu (Prefix (gnat_node));
+ gnu_result_type = get_unpadded_type (Etype (gnat_node));
/* Do any implicit dereferences of the prefix and do any needed
range check. */
- gnu_result = maybe_implicit_deref (gnu_result);
- gnu_result = maybe_unconstrained_array (gnu_result);
- gnu_type = TREE_TYPE (gnu_result);
- if (Do_Range_Check (gnat_range_node))
- {
- /* Get the bounds of the slice. */
+ gnu_result = maybe_implicit_deref (gnu_result);
+ gnu_result = maybe_unconstrained_array (gnu_result);
+ gnu_type = TREE_TYPE (gnu_result);
+ if (Do_Range_Check (gnat_range_node))
+ {
+ /* Get the bounds of the slice. */
tree gnu_index_type
= TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_result_type));
- tree gnu_min_expr = TYPE_MIN_VALUE (gnu_index_type);
- tree gnu_max_expr = TYPE_MAX_VALUE (gnu_index_type);
- tree gnu_expr_l, gnu_expr_h, gnu_expr_type;
-
- /* Check to see that the minimum slice value is in range */
- gnu_expr_l
- = emit_index_check
- (gnu_result, gnu_min_expr,
- TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))),
- TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))));
-
- /* Check to see that the maximum slice value is in range */
- gnu_expr_h
- = emit_index_check
- (gnu_result, gnu_max_expr,
- TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))),
- TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))));
-
- /* Derive a good type to convert everything too */
- gnu_expr_type = get_base_type (TREE_TYPE (gnu_expr_l));
-
- /* Build a compound expression that does the range checks */
- gnu_expr
- = build_binary_op (COMPOUND_EXPR, gnu_expr_type,
- convert (gnu_expr_type, gnu_expr_h),
- convert (gnu_expr_type, gnu_expr_l));
-
- /* Build a conditional expression that returns the range checks
- expression if the slice range is not null (max >= min) or
- returns the min if the slice range is null */
- gnu_expr
- = fold (build (COND_EXPR, gnu_expr_type,
- build_binary_op (GE_EXPR, gnu_expr_type,
- convert (gnu_expr_type,
- gnu_max_expr),
- convert (gnu_expr_type,
- gnu_min_expr)),
- gnu_expr, gnu_min_expr));
- }
- else
- gnu_expr = TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_result_type));
+ tree gnu_min_expr = TYPE_MIN_VALUE (gnu_index_type);
+ tree gnu_max_expr = TYPE_MAX_VALUE (gnu_index_type);
+ /* Get the permitted bounds. */
+ tree gnu_base_index_type
+ = TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type));
+ tree gnu_base_min_expr = TYPE_MIN_VALUE (gnu_base_index_type);
+ tree gnu_base_max_expr = TYPE_MAX_VALUE (gnu_base_index_type);
+ tree gnu_expr_l, gnu_expr_h, gnu_expr_type;
+
+ /* Check to see that the minimum slice value is in range. */
+ gnu_expr_l = emit_index_check (gnu_result,
+ gnu_min_expr,
+ gnu_base_min_expr,
+ gnu_base_max_expr);
+
+ /* Check to see that the maximum slice value is in range. */
+ gnu_expr_h = emit_index_check (gnu_result,
+ gnu_max_expr,
+ gnu_base_min_expr,
+ gnu_base_max_expr);
+
+ /* Derive a good type to convert everything to. */
+ gnu_expr_type = get_base_type (TREE_TYPE (gnu_expr_l));
+
+ /* Build a compound expression that does the range checks and
+ returns the low bound. */
+ gnu_expr = build_binary_op (COMPOUND_EXPR, gnu_expr_type,
+ convert (gnu_expr_type, gnu_expr_h),
+ convert (gnu_expr_type, gnu_expr_l));
+
+ /* Build a conditional expression that does the range check and
+ returns the low bound if the slice is not empty (max >= min),
+ and returns the naked low bound otherwise (max < min), unless
+ it is non-constant and the high bound is; this prevents VRP
+ from inferring bogus ranges on the unlikely path. */
+ gnu_expr = fold_build3 (COND_EXPR, gnu_expr_type,
+ build_binary_op (GE_EXPR, gnu_expr_type,
+ convert (gnu_expr_type,
+ gnu_max_expr),
+ convert (gnu_expr_type,
+ gnu_min_expr)),
+ gnu_expr,
+ TREE_CODE (gnu_min_expr) != INTEGER_CST
+ && TREE_CODE (gnu_max_expr) == INTEGER_CST
+ ? gnu_max_expr : gnu_min_expr);
+ }
+ else
+ /* Simply return the naked low bound. */
+ gnu_expr = TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_result_type));
- gnu_result = build_binary_op (ARRAY_RANGE_REF, gnu_result_type,
+ gnu_result = build_binary_op (ARRAY_RANGE_REF, gnu_result_type,
gnu_result, gnu_expr);
}
break;
NULL_TREE, gnu_prefix);
else
{
- gnu_field = gnat_to_gnu_entity (gnat_field, NULL_TREE, 0);
+ gnu_field = gnat_to_gnu_field_decl (gnat_field);
/* If there are discriminants, the prefix might be
evaluated more than once, which is a problem if it has
? Designated_Type (Etype
(Prefix (gnat_node)))
: Etype (Prefix (gnat_node))))
- gnu_prefix = gnat_stabilize_reference (gnu_prefix, 0);
+ gnu_prefix = gnat_stabilize_reference (gnu_prefix, false);
gnu_result
= build_component_ref (gnu_prefix, NULL_TREE, gnu_field,
== N_Attribute_Reference));
}
- if (gnu_result == 0)
- gigi_abort (308);
-
+ gcc_assert (gnu_result);
gnu_result_type = get_unpadded_type (Etype (gnat_node));
}
break;
{
/* The attribute designator (like an enumeration value). */
int attribute = Get_Attribute_Id (Attribute_Name (gnat_node));
- int prefix_unused = 0;
- tree gnu_prefix;
- tree gnu_type;
/* The Elab_Spec and Elab_Body attributes are special in that
Prefix is a unit, not an object with a GCC equivalent. Similarly
for Elaborated, since that variable isn't otherwise known. */
if (attribute == Attr_Elab_Body || attribute == Attr_Elab_Spec)
- {
- gnu_prefix
- = create_subprog_decl
- (create_concat_name (Entity (Prefix (gnat_node)),
- attribute == Attr_Elab_Body
- ? "elabb" : "elabs"),
- NULL_TREE, void_ftype, NULL_TREE, 0, 1, 1, 0);
- return gnu_prefix;
- }
-
- gnu_prefix = gnat_to_gnu (Prefix (gnat_node));
- gnu_type = TREE_TYPE (gnu_prefix);
-
- /* If the input is a NULL_EXPR, make a new one. */
- if (TREE_CODE (gnu_prefix) == NULL_EXPR)
- {
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- gnu_result = build1 (NULL_EXPR, gnu_result_type,
- TREE_OPERAND (gnu_prefix, 0));
- break;
- }
-
- switch (attribute)
- {
- case Attr_Pos:
- case Attr_Val:
- /* These are just conversions until since representation
- clauses for enumerations are handled in the front end. */
- {
- int check_p = Do_Range_Check (First (Expressions (gnat_node)));
-
- gnu_result = gnat_to_gnu (First (Expressions (gnat_node)));
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- gnu_result = convert_with_check (Etype (gnat_node), gnu_result,
- check_p, check_p, 1);
- }
- break;
-
- case Attr_Pred:
- case Attr_Succ:
- /* These just add or subject the constant 1. Representation
- clauses for enumerations are handled in the front-end. */
- gnu_expr = gnat_to_gnu (First (Expressions (gnat_node)));
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
-
- if (Do_Range_Check (First (Expressions (gnat_node))))
- {
- gnu_expr = protect_multiple_eval (gnu_expr);
- gnu_expr
- = emit_check
- (build_binary_op (EQ_EXPR, integer_type_node,
- gnu_expr,
- attribute == Attr_Pred
- ? TYPE_MIN_VALUE (gnu_result_type)
- : TYPE_MAX_VALUE (gnu_result_type)),
- gnu_expr, CE_Range_Check_Failed);
- }
-
- gnu_result
- = build_binary_op (attribute == Attr_Pred
- ? MINUS_EXPR : PLUS_EXPR,
- gnu_result_type, gnu_expr,
- convert (gnu_result_type, integer_one_node));
- break;
-
- case Attr_Address:
- case Attr_Unrestricted_Access:
-
- /* Conversions don't change something's address but can cause
- us to miss the COMPONENT_REF case below, so strip them off. */
- gnu_prefix
- = remove_conversions (gnu_prefix,
- ! Must_Be_Byte_Aligned (gnat_node));
-
- /* If we are taking 'Address of an unconstrained object,
- this is the pointer to the underlying array. */
- gnu_prefix = maybe_unconstrained_array (gnu_prefix);
-
- /* ... fall through ... */
-
- case Attr_Access:
- case Attr_Unchecked_Access:
- case Attr_Code_Address:
-
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- gnu_result
- = build_unary_op (((attribute == Attr_Address
- || attribute == Attr_Unrestricted_Access)
- && ! Must_Be_Byte_Aligned (gnat_node))
- ? ATTR_ADDR_EXPR : ADDR_EXPR,
- gnu_result_type, gnu_prefix);
-
- /* For 'Code_Address, find an inner ADDR_EXPR and mark it
- so that we don't try to build a trampoline. */
- if (attribute == Attr_Code_Address)
- {
- for (gnu_expr = gnu_result;
- TREE_CODE (gnu_expr) == NOP_EXPR
- || TREE_CODE (gnu_expr) == CONVERT_EXPR;
- gnu_expr = TREE_OPERAND (gnu_expr, 0))
- TREE_CONSTANT (gnu_expr) = 1;
- ;
-
- if (TREE_CODE (gnu_expr) == ADDR_EXPR)
- TREE_STATIC (gnu_expr) = TREE_CONSTANT (gnu_expr) = 1;
- }
-
- break;
-
- case Attr_Pool_Address:
- {
- tree gnu_obj_type;
- tree gnu_ptr = gnu_prefix;
-
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
-
- /* If this is an unconstrained array, we know the object must
- have been allocated with the template in front of the object.
- So compute the template address.*/
-
- if (TYPE_FAT_POINTER_P (TREE_TYPE (gnu_ptr)))
- gnu_ptr
- = convert (build_pointer_type
- (TYPE_OBJECT_RECORD_TYPE
- (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (gnu_ptr)))),
- gnu_ptr);
-
- gnu_obj_type = TREE_TYPE (TREE_TYPE (gnu_ptr));
- if (TREE_CODE (gnu_obj_type) == RECORD_TYPE
- && TYPE_CONTAINS_TEMPLATE_P (gnu_obj_type))
- {
- tree gnu_char_ptr_type = build_pointer_type (char_type_node);
- tree gnu_pos = byte_position (TYPE_FIELDS (gnu_obj_type));
- tree gnu_byte_offset
- = convert (gnu_char_ptr_type,
- size_diffop (size_zero_node, gnu_pos));
-
- gnu_ptr = convert (gnu_char_ptr_type, gnu_ptr);
- gnu_ptr = build_binary_op (MINUS_EXPR, gnu_char_ptr_type,
- gnu_ptr, gnu_byte_offset);
- }
-
- gnu_result = convert (gnu_result_type, gnu_ptr);
- }
- break;
-
- case Attr_Size:
- case Attr_Object_Size:
- case Attr_Value_Size:
- case Attr_Max_Size_In_Storage_Elements:
-
- gnu_expr = gnu_prefix;
-
- /* Remove NOPS from gnu_expr and conversions from gnu_prefix.
- We only use GNU_EXPR to see if a COMPONENT_REF was involved. */
- while (TREE_CODE (gnu_expr) == NOP_EXPR)
- gnu_expr = TREE_OPERAND (gnu_expr, 0);
-
- gnu_prefix = remove_conversions (gnu_prefix, 1);
- prefix_unused = 1;
- gnu_type = TREE_TYPE (gnu_prefix);
-
- /* Replace an unconstrained array type with the type of the
- underlying array. We can't do this with a call to
- maybe_unconstrained_array since we may have a TYPE_DECL.
- For 'Max_Size_In_Storage_Elements, use the record type
- that will be used to allocate the object and its template. */
-
- if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
- {
- gnu_type = TYPE_OBJECT_RECORD_TYPE (gnu_type);
- if (attribute != Attr_Max_Size_In_Storage_Elements)
- gnu_type = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type)));
- }
-
- /* If we are looking for the size of a field, return the
- field size. Otherwise, if the prefix is an object,
- or if 'Object_Size or 'Max_Size_In_Storage_Elements has
- been specified, the result is the GCC size of the type.
- Otherwise, the result is the RM_Size of the type. */
- if (TREE_CODE (gnu_prefix) == COMPONENT_REF)
- gnu_result = DECL_SIZE (TREE_OPERAND (gnu_prefix, 1));
- else if (TREE_CODE (gnu_prefix) != TYPE_DECL
- || attribute == Attr_Object_Size
- || attribute == Attr_Max_Size_In_Storage_Elements)
- {
- /* If this is a padded type, the GCC size isn't relevant
- to the programmer. Normally, what we want is the RM_Size,
- which was set from the specified size, but if it was not
- set, we want the size of the relevant field. Using the MAX
- of those two produces the right result in all case. Don't
- use the size of the field if it's a self-referential type,
- since that's never what's wanted. */
- if (TREE_CODE (gnu_type) == RECORD_TYPE
- && TYPE_IS_PADDING_P (gnu_type)
- && TREE_CODE (gnu_expr) == COMPONENT_REF)
- {
- gnu_result = rm_size (gnu_type);
- if (! (CONTAINS_PLACEHOLDER_P
- (DECL_SIZE (TREE_OPERAND (gnu_expr, 1)))))
- gnu_result
- = size_binop (MAX_EXPR, gnu_result,
- DECL_SIZE (TREE_OPERAND (gnu_expr, 1)));
- }
- else
- gnu_result = TYPE_SIZE (gnu_type);
- }
- else
- gnu_result = rm_size (gnu_type);
-
- if (gnu_result == 0)
- gigi_abort (325);
-
- /* Deal with a self-referential size by returning the maximum
- size for a type and by qualifying the size with
- the object for 'Size of an object. */
-
- if (CONTAINS_PLACEHOLDER_P (gnu_result))
- {
- if (TREE_CODE (gnu_prefix) != TYPE_DECL)
- gnu_result = substitute_placeholder_in_expr (gnu_result,
- gnu_expr);
- else
- gnu_result = max_size (gnu_result, 1);
- }
-
- /* If the type contains a template, subtract the size of the
- template. */
- if (TREE_CODE (gnu_type) == RECORD_TYPE
- && TYPE_CONTAINS_TEMPLATE_P (gnu_type))
- gnu_result = size_binop (MINUS_EXPR, gnu_result,
- DECL_SIZE (TYPE_FIELDS (gnu_type)));
-
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
-
- /* Always perform division using unsigned arithmetic as the
- size cannot be negative, but may be an overflowed positive
- value. This provides correct results for sizes up to 512 MB.
- ??? Size should be calculated in storage elements directly. */
-
- if (attribute == Attr_Max_Size_In_Storage_Elements)
- gnu_result = convert (sizetype,
- fold (build (CEIL_DIV_EXPR, bitsizetype,
- gnu_result,
- bitsize_unit_node)));
- break;
-
- case Attr_Alignment:
- if (TREE_CODE (gnu_prefix) == COMPONENT_REF
- && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))
- == RECORD_TYPE)
- && (TYPE_IS_PADDING_P
- (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))))
- gnu_prefix = TREE_OPERAND (gnu_prefix, 0);
-
- gnu_type = TREE_TYPE (gnu_prefix);
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- prefix_unused = 1;
-
- if (TREE_CODE (gnu_prefix) == COMPONENT_REF)
- gnu_result
- = size_int (DECL_ALIGN (TREE_OPERAND (gnu_prefix, 1)));
- else
- gnu_result = size_int (TYPE_ALIGN (gnu_type) / BITS_PER_UNIT);
- break;
-
- case Attr_First:
- case Attr_Last:
- case Attr_Range_Length:
- prefix_unused = 1;
-
- if (INTEGRAL_TYPE_P (gnu_type)
- || TREE_CODE (gnu_type) == REAL_TYPE)
- {
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
-
- if (attribute == Attr_First)
- gnu_result = TYPE_MIN_VALUE (gnu_type);
- else if (attribute == Attr_Last)
- gnu_result = TYPE_MAX_VALUE (gnu_type);
- else
- gnu_result
- = build_binary_op
- (MAX_EXPR, get_base_type (gnu_result_type),
- build_binary_op
- (PLUS_EXPR, get_base_type (gnu_result_type),
- build_binary_op (MINUS_EXPR,
- get_base_type (gnu_result_type),
- convert (gnu_result_type,
- TYPE_MAX_VALUE (gnu_type)),
- convert (gnu_result_type,
- TYPE_MIN_VALUE (gnu_type))),
- convert (gnu_result_type, integer_one_node)),
- convert (gnu_result_type, integer_zero_node));
-
- break;
- }
- /* ... fall through ... */
- case Attr_Length:
- {
- int Dimension
- = (Present (Expressions (gnat_node))
- ? UI_To_Int (Intval (First (Expressions (gnat_node))))
- : 1);
-
- /* Make sure any implicit dereference gets done. */
- gnu_prefix = maybe_implicit_deref (gnu_prefix);
- gnu_prefix = maybe_unconstrained_array (gnu_prefix);
- gnu_type = TREE_TYPE (gnu_prefix);
- prefix_unused = 1;
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
-
- if (TYPE_CONVENTION_FORTRAN_P (gnu_type))
- {
- int ndim;
- tree gnu_type_temp;
-
- for (ndim = 1, gnu_type_temp = gnu_type;
- TREE_CODE (TREE_TYPE (gnu_type_temp)) == ARRAY_TYPE
- && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type_temp));
- ndim++, gnu_type_temp = TREE_TYPE (gnu_type_temp))
- ;
-
- Dimension = ndim + 1 - Dimension;
- }
-
- for (; Dimension > 1; Dimension--)
- gnu_type = TREE_TYPE (gnu_type);
-
- if (TREE_CODE (gnu_type) != ARRAY_TYPE)
- gigi_abort (309);
-
- if (attribute == Attr_First)
- gnu_result
- = TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type)));
- else if (attribute == Attr_Last)
- gnu_result
- = TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type)));
- else
- /* 'Length or 'Range_Length. */
- {
- tree gnu_compute_type
- = gnat_signed_or_unsigned_type
- (0, get_base_type (gnu_result_type));
-
- gnu_result
- = build_binary_op
- (MAX_EXPR, gnu_compute_type,
- build_binary_op
- (PLUS_EXPR, gnu_compute_type,
- build_binary_op
- (MINUS_EXPR, gnu_compute_type,
- convert (gnu_compute_type,
- TYPE_MAX_VALUE
- (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type)))),
- convert (gnu_compute_type,
- TYPE_MIN_VALUE
- (TYPE_INDEX_TYPE (TYPE_DOMAIN (gnu_type))))),
- convert (gnu_compute_type, integer_one_node)),
- convert (gnu_compute_type, integer_zero_node));
- }
-
- /* If this has a PLACEHOLDER_EXPR, qualify it by the object
- we are handling. Note that these attributes could not
- have been used on an unconstrained array type. */
- gnu_result = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_result,
- gnu_prefix);
-
- break;
- }
-
- case Attr_Bit_Position:
- case Attr_Position:
- case Attr_First_Bit:
- case Attr_Last_Bit:
- case Attr_Bit:
- {
- HOST_WIDE_INT bitsize;
- HOST_WIDE_INT bitpos;
- tree gnu_offset;
- tree gnu_field_bitpos;
- tree gnu_field_offset;
- tree gnu_inner;
- enum machine_mode mode;
- int unsignedp, volatilep;
-
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- gnu_prefix = remove_conversions (gnu_prefix, 1);
- prefix_unused = 1;
-
- /* We can have 'Bit on any object, but if it isn't a
- COMPONENT_REF, the result is zero. Do not allow
- 'Bit on a bare component, though. */
- if (attribute == Attr_Bit
- && TREE_CODE (gnu_prefix) != COMPONENT_REF
- && TREE_CODE (gnu_prefix) != FIELD_DECL)
- {
- gnu_result = integer_zero_node;
- break;
- }
-
- else if (TREE_CODE (gnu_prefix) != COMPONENT_REF
- && ! (attribute == Attr_Bit_Position
- && TREE_CODE (gnu_prefix) == FIELD_DECL))
- gigi_abort (310);
-
- get_inner_reference (gnu_prefix, &bitsize, &bitpos, &gnu_offset,
- &mode, &unsignedp, &volatilep);
-
- if (TREE_CODE (gnu_prefix) == COMPONENT_REF)
- {
- gnu_field_bitpos
- = bit_position (TREE_OPERAND (gnu_prefix, 1));
- gnu_field_offset
- = byte_position (TREE_OPERAND (gnu_prefix, 1));
-
- for (gnu_inner = TREE_OPERAND (gnu_prefix, 0);
- TREE_CODE (gnu_inner) == COMPONENT_REF
- && DECL_INTERNAL_P (TREE_OPERAND (gnu_inner, 1));
- gnu_inner = TREE_OPERAND (gnu_inner, 0))
- {
- gnu_field_bitpos
- = size_binop (PLUS_EXPR, gnu_field_bitpos,
- bit_position (TREE_OPERAND (gnu_inner,
- 1)));
- gnu_field_offset
- = size_binop (PLUS_EXPR, gnu_field_offset,
- byte_position (TREE_OPERAND (gnu_inner,
- 1)));
- }
- }
- else if (TREE_CODE (gnu_prefix) == FIELD_DECL)
- {
- gnu_field_bitpos = bit_position (gnu_prefix);
- gnu_field_offset = byte_position (gnu_prefix);
- }
- else
- {
- gnu_field_bitpos = bitsize_zero_node;
- gnu_field_offset = size_zero_node;
- }
-
- switch (attribute)
- {
- case Attr_Position:
- gnu_result = gnu_field_offset;
- break;
-
- case Attr_First_Bit:
- case Attr_Bit:
- gnu_result = size_int (bitpos % BITS_PER_UNIT);
- break;
-
- case Attr_Last_Bit:
- gnu_result = bitsize_int (bitpos % BITS_PER_UNIT);
- gnu_result
- = size_binop (PLUS_EXPR, gnu_result,
- TYPE_SIZE (TREE_TYPE (gnu_prefix)));
- gnu_result = size_binop (MINUS_EXPR, gnu_result,
- bitsize_one_node);
- break;
-
- case Attr_Bit_Position:
- gnu_result = gnu_field_bitpos;
- break;
- }
-
- /* If this has a PLACEHOLDER_EXPR, qualify it by the object
- we are handling. */
- gnu_result = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_result,
- gnu_prefix);
-
- break;
- }
-
- case Attr_Min:
- case Attr_Max:
- gnu_lhs = gnat_to_gnu (First (Expressions (gnat_node)));
- gnu_rhs = gnat_to_gnu (Next (First (Expressions (gnat_node))));
-
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- gnu_result = build_binary_op (attribute == Attr_Min
- ? MIN_EXPR : MAX_EXPR,
- gnu_result_type, gnu_lhs, gnu_rhs);
- break;
-
- case Attr_Passed_By_Reference:
- gnu_result = size_int (default_pass_by_ref (gnu_type)
- || must_pass_by_ref (gnu_type));
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- break;
-
- case Attr_Component_Size:
- if (TREE_CODE (gnu_prefix) == COMPONENT_REF
- && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))
- == RECORD_TYPE)
- && (TYPE_IS_PADDING_P
- (TREE_TYPE (TREE_OPERAND (gnu_prefix, 0)))))
- gnu_prefix = TREE_OPERAND (gnu_prefix, 0);
-
- gnu_prefix = maybe_implicit_deref (gnu_prefix);
- gnu_type = TREE_TYPE (gnu_prefix);
-
- if (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE)
- gnu_type
- = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (gnu_type))));
-
- while (TREE_CODE (TREE_TYPE (gnu_type)) == ARRAY_TYPE
- && TYPE_MULTI_ARRAY_P (TREE_TYPE (gnu_type)))
- gnu_type = TREE_TYPE (gnu_type);
-
- if (TREE_CODE (gnu_type) != ARRAY_TYPE)
- gigi_abort (330);
-
- /* Note this size cannot be self-referential. */
- gnu_result = TYPE_SIZE (TREE_TYPE (gnu_type));
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- prefix_unused = 1;
- break;
-
- case Attr_Null_Parameter:
- /* This is just a zero cast to the pointer type for
- our prefix and dereferenced. */
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- gnu_result
- = build_unary_op (INDIRECT_REF, NULL_TREE,
- convert (build_pointer_type (gnu_result_type),
- integer_zero_node));
- TREE_PRIVATE (gnu_result) = 1;
- break;
-
- case Attr_Mechanism_Code:
- {
- int code;
- Entity_Id gnat_obj = Entity (Prefix (gnat_node));
-
- prefix_unused = 1;
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- if (Present (Expressions (gnat_node)))
- {
- int i = UI_To_Int (Intval (First (Expressions (gnat_node))));
-
- for (gnat_obj = First_Formal (gnat_obj); i > 1;
- i--, gnat_obj = Next_Formal (gnat_obj))
- ;
- }
-
- code = Mechanism (gnat_obj);
- if (code == Default)
- code = ((present_gnu_tree (gnat_obj)
- && (DECL_BY_REF_P (get_gnu_tree (gnat_obj))
- || ((TREE_CODE (get_gnu_tree (gnat_obj))
- == PARM_DECL)
- && (DECL_BY_COMPONENT_PTR_P
- (get_gnu_tree (gnat_obj))))))
- ? By_Reference : By_Copy);
- gnu_result = convert (gnu_result_type, size_int (- code));
- }
- break;
-
- default:
- /* Say we have an unimplemented attribute. Then set the
- value to be returned to be a zero and hope that's something
- we can convert to the type of this attribute. */
-
- post_error ("unimplemented attribute", gnat_node);
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- gnu_result = integer_zero_node;
- break;
- }
-
- /* If this is an attribute where the prefix was unused,
- force a use of it if it has a side-effect. But don't do it if
- the prefix is just an entity name. However, if an access check
- is needed, we must do it. See second example in AARM 11.6(5.e). */
- if (prefix_unused && TREE_SIDE_EFFECTS (gnu_prefix)
- && ! Is_Entity_Name (Prefix (gnat_node)))
- gnu_result = fold (build (COMPOUND_EXPR, TREE_TYPE (gnu_result),
- gnu_prefix, gnu_result));
+ return (create_subprog_decl
+ (create_concat_name (Entity (Prefix (gnat_node)),
+ attribute == Attr_Elab_Body
+ ? "elabb" : "elabs"),
+ NULL_TREE, void_ftype, NULL_TREE, false, true, true, NULL,
+ gnat_node));
+
+ gnu_result = Attribute_to_gnu (gnat_node, &gnu_result_type, attribute);
}
break;
/* ??? It is wrong to evaluate the type now, but there doesn't
seem to be any other practical way of doing it. */
+ gcc_assert (!Expansion_Delayed (gnat_node));
+
gnu_aggr_type = gnu_result_type
= get_unpadded_type (Etype (gnat_node));
if (Null_Record_Present (gnat_node))
gnu_result = gnat_build_constructor (gnu_aggr_type, NULL_TREE);
- else if (TREE_CODE (gnu_aggr_type) == RECORD_TYPE)
+ else if (TREE_CODE (gnu_aggr_type) == RECORD_TYPE
+ || TREE_CODE (gnu_aggr_type) == UNION_TYPE)
gnu_result
- = assoc_to_constructor (First (Component_Associations (gnat_node)),
+ = assoc_to_constructor (Etype (gnat_node),
+ First (Component_Associations (gnat_node)),
gnu_aggr_type);
- else if (TREE_CODE (gnu_aggr_type) == UNION_TYPE)
- {
- /* The first element is the discrimant, which we ignore. The
- next is the field we're building. Convert the expression
- to the type of the field and then to the union type. */
- Node_Id gnat_assoc
- = Next (First (Component_Associations (gnat_node)));
- Entity_Id gnat_field = Entity (First (Choices (gnat_assoc)));
- tree gnu_field_type
- = TREE_TYPE (gnat_to_gnu_entity (gnat_field, NULL_TREE, 0));
-
- gnu_result = convert (gnu_field_type,
- gnat_to_gnu (Expression (gnat_assoc)));
- }
else if (TREE_CODE (gnu_aggr_type) == ARRAY_TYPE)
gnu_result = pos_to_constructor (First (Expressions (gnat_node)),
gnu_aggr_type,
(Next
(First (Component_Associations (gnat_node))))));
else
- gigi_abort (312);
+ gcc_unreachable ();
gnu_result = convert (gnu_result_type, gnu_result);
}
tree gnu_obj_type = TREE_TYPE (gnu_result_type);
unsigned int oalign = TYPE_ALIGN (gnu_obj_type);
- if (align != 0 && align < oalign && ! TYPE_ALIGN_OK (gnu_obj_type))
+ if (align != 0 && align < oalign && !TYPE_ALIGN_OK (gnu_obj_type))
post_error_ne_tree_2
- ("?source alignment (^) < alignment of & (^)",
+ ("?source alignment (^) '< alignment of & (^)",
gnat_node, Designated_Type (Etype (gnat_node)),
size_int (align / BITS_PER_UNIT), oalign / BITS_PER_UNIT);
}
gnu_high = TYPE_MAX_VALUE (gnu_range_type);
}
else
- gigi_abort (313);
+ gcc_unreachable ();
gnu_result_type = get_unpadded_type (Etype (gnat_node));
gnu_result_type, gnu_lhs, gnu_rhs);
break;
- case N_And_Then: case N_Or_Else:
- {
- /* Some processing below (e.g. clear_last_expr) requires access to
- status fields now maintained in the current function context, so
- we'll setup a dummy one if needed. We cannot use global_binding_p,
- since it might be true due to force_global and making a dummy
- context would kill the current function context. */
- bool make_dummy_context = (cfun == 0);
- enum tree_code code = gnu_codes[Nkind (gnat_node)];
- tree gnu_rhs_side;
-
- if (make_dummy_context)
- init_dummy_function_start ();
-
- /* The elaboration of the RHS may generate code. If so,
- we need to make sure it gets executed after the LHS. */
- gnu_lhs = gnat_to_gnu (Left_Opnd (gnat_node));
- clear_last_expr ();
-
- gnu_rhs_side = expand_start_stmt_expr (1 /*has_scope*/);
- gnu_rhs = gnat_to_gnu (Right_Opnd (gnat_node));
- expand_end_stmt_expr (gnu_rhs_side);
-
- if (make_dummy_context)
- expand_dummy_function_end ();
-
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
-
- if (first_nondeleted_insn (RTL_EXPR_SEQUENCE (gnu_rhs_side)))
- gnu_rhs = build (COMPOUND_EXPR, gnu_result_type, gnu_rhs_side,
- gnu_rhs);
-
- gnu_result = build_binary_op (code, gnu_result_type, gnu_lhs, gnu_rhs);
- }
- break;
-
case N_Op_Or: case N_Op_And: case N_Op_Xor:
/* These can either be operations on booleans or on modular types.
Fall through for boolean types since that's the way GNU_CODES is
case N_Op_Shift_Left:
case N_Op_Shift_Right:
case N_Op_Shift_Right_Arithmetic:
+ case N_And_Then: case N_Or_Else:
{
enum tree_code code = gnu_codes[Nkind (gnat_node)];
+ bool ignore_lhs_overflow = false;
tree gnu_type;
gnu_lhs = gnat_to_gnu (Left_Opnd (gnat_node));
/* If this is a comparison operator, convert any references to
an unconstrained array value into a reference to the
actual array. */
- if (TREE_CODE_CLASS (code) == '<')
+ if (TREE_CODE_CLASS (code) == tcc_comparison)
{
gnu_lhs = maybe_unconstrained_array (gnu_lhs);
gnu_rhs = maybe_unconstrained_array (gnu_rhs);
/* If this is a shift whose count is not guaranteed to be correct,
we need to adjust the shift count. */
if (IN (Nkind (gnat_node), N_Op_Shift)
- && ! Shift_Count_OK (gnat_node))
+ && !Shift_Count_OK (gnat_node))
{
tree gnu_count_type = get_base_type (TREE_TYPE (gnu_rhs));
tree gnu_max_shift
}
/* For right shifts, the type says what kind of shift to do,
- so we may need to choose a different type. */
+ so we may need to choose a different type. In this case,
+ we have to ignore integer overflow lest it propagates all
+ the way down and causes a CE to be explicitly raised. */
if (Nkind (gnat_node) == N_Op_Shift_Right
- && ! TYPE_UNSIGNED (gnu_type))
- gnu_type = gnat_unsigned_type (gnu_type);
+ && !TYPE_UNSIGNED (gnu_type))
+ {
+ gnu_type = gnat_unsigned_type (gnu_type);
+ ignore_lhs_overflow = true;
+ }
else if (Nkind (gnat_node) == N_Op_Shift_Right_Arithmetic
&& TYPE_UNSIGNED (gnu_type))
- gnu_type = gnat_signed_type (gnu_type);
+ {
+ gnu_type = gnat_signed_type (gnu_type);
+ ignore_lhs_overflow = true;
+ }
if (gnu_type != gnu_result_type)
{
+ tree gnu_old_lhs = gnu_lhs;
gnu_lhs = convert (gnu_type, gnu_lhs);
+ if (TREE_CODE (gnu_lhs) == INTEGER_CST && ignore_lhs_overflow)
+ TREE_OVERFLOW (gnu_lhs) = TREE_OVERFLOW (gnu_old_lhs);
gnu_rhs = convert (gnu_type, gnu_rhs);
}
above in this case. */
if ((Nkind (gnat_node) == N_Op_Shift_Left
|| Nkind (gnat_node) == N_Op_Shift_Right)
- && ! Shift_Count_OK (gnat_node))
+ && !Shift_Count_OK (gnat_node))
gnu_result
= build_cond_expr
(gnu_type,
/* This case can apply to a boolean or a modular type.
Fall through for a boolean operand since GNU_CODES is set
up to handle this. */
- if (IN (Ekind (Etype (gnat_node)), Modular_Integer_Kind))
+ if (Is_Modular_Integer_Type (Etype (gnat_node))
+ || (Ekind (Etype (gnat_node)) == E_Private_Type
+ && Is_Modular_Integer_Type (Full_View (Etype (gnat_node)))))
{
gnu_expr = gnat_to_gnu (Right_Opnd (gnat_node));
gnu_result_type = get_unpadded_type (Etype (gnat_node));
{
tree gnu_init = 0;
tree gnu_type;
+ bool ignore_init_type = false;
gnat_temp = Expression (gnat_node);
Entity_Id gnat_desig_type
= Designated_Type (Underlying_Type (Etype (gnat_node)));
+ ignore_init_type = Has_Constrained_Partial_View (gnat_desig_type);
gnu_init = gnat_to_gnu (Expression (gnat_temp));
gnu_init = maybe_unconstrained_array (gnu_init);
}
}
else
- gigi_abort (315);
+ gcc_unreachable ();
gnu_result_type = get_unpadded_type (Etype (gnat_node));
return build_allocator (gnu_type, gnu_init, gnu_result_type,
Procedure_To_Call (gnat_node),
- Storage_Pool (gnat_node), gnat_node);
+ Storage_Pool (gnat_node), gnat_node,
+ ignore_init_type);
}
break;
/***************************/
case N_Label:
- gnu_result = build_nt (LABEL_STMT, gnat_to_gnu (Identifier (gnat_node)));
+ gnu_result = build1 (LABEL_EXPR, void_type_node,
+ gnat_to_gnu (Identifier (gnat_node)));
break;
case N_Null_Statement:
+ gnu_result = alloc_stmt_list ();
break;
case N_Assignment_Statement:
/* Get the LHS and RHS of the statement and convert any reference to an
- unconstrained array into a reference to the underlying array. */
+ unconstrained array into a reference to the underlying array.
+ If we are not to do range checking and the RHS is an N_Function_Call,
+ pass the LHS to the call function. */
gnu_lhs = maybe_unconstrained_array (gnat_to_gnu (Name (gnat_node)));
- gnu_rhs
- = maybe_unconstrained_array (gnat_to_gnu (Expression (gnat_node)));
-
- /* If range check is needed, emit code to generate it */
- if (Do_Range_Check (Expression (gnat_node)))
- gnu_rhs = emit_range_check (gnu_rhs, Etype (Name (gnat_node)));
-
- /* If either side's type has a size that overflows, convert this
- into raise of Storage_Error: execution shouldn't have gotten
- here anyway. */
- if ((TREE_CODE (TYPE_SIZE (TREE_TYPE (gnu_lhs))) == INTEGER_CST
- && TREE_OVERFLOW (TYPE_SIZE (TREE_TYPE (gnu_lhs))))
- || (TREE_CODE (TYPE_SIZE (TREE_TYPE (gnu_rhs))) == INTEGER_CST
- && TREE_OVERFLOW (TYPE_SIZE (TREE_TYPE (gnu_rhs)))))
- gnu_result = build_call_raise (SE_Object_Too_Large);
+
+ /* If the type has a size that overflows, convert this into raise of
+ Storage_Error: execution shouldn't have gotten here anyway. */
+ if (TREE_CODE (TYPE_SIZE_UNIT (TREE_TYPE (gnu_lhs))) == INTEGER_CST
+ && TREE_OVERFLOW (TYPE_SIZE_UNIT (TREE_TYPE (gnu_lhs))))
+ gnu_result = build_call_raise (SE_Object_Too_Large, gnat_node,
+ N_Raise_Storage_Error);
+ else if (Nkind (Expression (gnat_node)) == N_Function_Call
+ && !Do_Range_Check (Expression (gnat_node)))
+ gnu_result = call_to_gnu (Expression (gnat_node),
+ &gnu_result_type, gnu_lhs);
else
- gnu_result
- = build_binary_op (MODIFY_EXPR, NULL_TREE, gnu_lhs, gnu_rhs);
+ {
+ gnu_rhs
+ = maybe_unconstrained_array (gnat_to_gnu (Expression (gnat_node)));
+
+ /* If range check is needed, emit code to generate it */
+ if (Do_Range_Check (Expression (gnat_node)))
+ gnu_rhs = emit_range_check (gnu_rhs, Etype (Name (gnat_node)));
- gnu_result = build_nt (EXPR_STMT, gnu_result);
+ gnu_result
+ = build_binary_op (MODIFY_EXPR, NULL_TREE, gnu_lhs, gnu_rhs);
+ }
break;
case N_If_Statement:
- gnu_result = NULL_TREE;
-
- /* Make an IF_STMT for each of the "else if" parts. */
- if (Present (Elsif_Parts (gnat_node)))
- for (gnat_temp = First (Elsif_Parts (gnat_node));
- Present (gnat_temp); gnat_temp = Next (gnat_temp))
- {
- tree gnu_cond, gnu_elseif;
-
- gnu_cond = gnat_to_gnu (Condition (gnat_temp));
- gnu_elseif
- = build_nt (IF_STMT, gnu_cond,
- build_block_stmt (Then_Statements (gnat_temp)),
- NULL_TREE, NULL_TREE);
-
- TREE_SLOC (gnu_elseif) = Sloc (Condition (gnat_temp));
- TREE_CHAIN (gnu_elseif) = gnu_result;
- TREE_TYPE (gnu_elseif) = void_type_node;
- gnu_result = gnu_elseif;
- }
-
{
- tree gnu_cond, then_block, else_block;
-
- gnu_cond = gnat_to_gnu (Condition (gnat_node));
- then_block = build_block_stmt (Then_Statements (gnat_node));
- else_block = build_block_stmt (Else_Statements (gnat_node));
+ tree *gnu_else_ptr; /* Point to put next "else if" or "else". */
+
+ /* Make the outer COND_EXPR. Avoid non-determinism. */
+ gnu_result = build3 (COND_EXPR, void_type_node,
+ gnat_to_gnu (Condition (gnat_node)),
+ NULL_TREE, NULL_TREE);
+ COND_EXPR_THEN (gnu_result)
+ = build_stmt_group (Then_Statements (gnat_node), false);
+ TREE_SIDE_EFFECTS (gnu_result) = 1;
+ gnu_else_ptr = &COND_EXPR_ELSE (gnu_result);
+
+ /* Now make a COND_EXPR for each of the "else if" parts. Put each
+ into the previous "else" part and point to where to put any
+ outer "else". Also avoid non-determinism. */
+ if (Present (Elsif_Parts (gnat_node)))
+ for (gnat_temp = First (Elsif_Parts (gnat_node));
+ Present (gnat_temp); gnat_temp = Next (gnat_temp))
+ {
+ gnu_expr = build3 (COND_EXPR, void_type_node,
+ gnat_to_gnu (Condition (gnat_temp)),
+ NULL_TREE, NULL_TREE);
+ COND_EXPR_THEN (gnu_expr)
+ = build_stmt_group (Then_Statements (gnat_temp), false);
+ TREE_SIDE_EFFECTS (gnu_expr) = 1;
+ annotate_with_node (gnu_expr, gnat_temp);
+ *gnu_else_ptr = gnu_expr;
+ gnu_else_ptr = &COND_EXPR_ELSE (gnu_expr);
+ }
- gnu_result = build_nt (IF_STMT, gnu_cond,
- then_block,
- nreverse (gnu_result),
- else_block);
+ *gnu_else_ptr = build_stmt_group (Else_Statements (gnat_node), false);
}
break;
case N_Case_Statement:
- {
- Node_Id gnat_when;
- Node_Id gnat_choice;
- tree gnu_label;
- Node_Id gnat_statement;
-
- gnu_expr = gnat_to_gnu (Expression (gnat_node));
- gnu_expr = convert (get_base_type (TREE_TYPE (gnu_expr)), gnu_expr);
-
- /* The range of values in a case statement is determined by the
- rules in RM 5.4(7-9). In almost all cases, this range is
- represented by the Etype of the expression. One exception arises
- in the case of a simple name that is parenthesized. This still
- has the Etype of the name, but since it is not a name, para 7
- does not apply, and we need to go to the base type. This is the
- only case where parenthesization affects the dynamic semantics
- (i.e. the range of possible values at runtime that is covered by
- the others alternative.
-
- Another exception is if the subtype of the expression is
- non-static. In that case, we also have to use the base type. */
- if (Paren_Count (Expression (gnat_node)) != 0
- || !Is_OK_Static_Subtype (Underlying_Type
- (Etype (Expression (gnat_node)))))
- gnu_expr = convert (get_base_type (TREE_TYPE (gnu_expr)), gnu_expr);
-
- set_lineno (gnat_node, 1);
- expand_start_case (1, gnu_expr, TREE_TYPE (gnu_expr), "case");
-
- for (gnat_when = First_Non_Pragma (Alternatives (gnat_node));
- Present (gnat_when);
- gnat_when = Next_Non_Pragma (gnat_when))
- {
- /* First compile all the different case choices for the current
- WHEN alternative. */
-
- for (gnat_choice = First (Discrete_Choices (gnat_when));
- Present (gnat_choice); gnat_choice = Next (gnat_choice))
- {
- int error_code;
-
- gnu_label = build_decl (LABEL_DECL, NULL_TREE, NULL_TREE);
-
- set_lineno (gnat_choice, 1);
- switch (Nkind (gnat_choice))
- {
- case N_Range:
- /* Abort on all errors except range empty, which
- means we ignore this alternative. */
- error_code
- = pushcase_range (gnat_to_gnu (Low_Bound (gnat_choice)),
- gnat_to_gnu (High_Bound (gnat_choice)),
- convert, gnu_label, 0);
-
- if (error_code != 0 && error_code != 4)
- gigi_abort (332);
- break;
-
- case N_Subtype_Indication:
- error_code
- = pushcase_range
- (gnat_to_gnu (Low_Bound (Range_Expression
- (Constraint (gnat_choice)))),
- gnat_to_gnu (High_Bound (Range_Expression
- (Constraint (gnat_choice)))),
- convert, gnu_label, 0);
-
- if (error_code != 0 && error_code != 4)
- gigi_abort (332);
- break;
-
- case N_Identifier:
- case N_Expanded_Name:
- /* This represents either a subtype range or a static value
- of some kind; Ekind says which. If a static value,
- fall through to the next case. */
- if (IN (Ekind (Entity (gnat_choice)), Type_Kind))
- {
- tree type = get_unpadded_type (Entity (gnat_choice));
-
- error_code
- = pushcase_range (fold (TYPE_MIN_VALUE (type)),
- fold (TYPE_MAX_VALUE (type)),
- convert, gnu_label, 0);
-
- if (error_code != 0 && error_code != 4)
- gigi_abort (332);
- break;
- }
- /* ... fall through ... */
- case N_Character_Literal:
- case N_Integer_Literal:
- if (pushcase (gnat_to_gnu (gnat_choice), convert,
- gnu_label, 0))
- gigi_abort (332);
- break;
-
- case N_Others_Choice:
- if (pushcase (NULL_TREE, convert, gnu_label, 0))
- gigi_abort (332);
- break;
-
- default:
- gigi_abort (316);
- }
- }
-
- /* After compiling the choices attached to the WHEN compile the
- body of statements that have to be executed, should the
- "WHEN ... =>" be taken. Push a binding level here in case
- variables are declared since we want them to be local to this
- set of statements instead of the block containing the Case
- statement. */
- pushlevel (0);
- expand_start_bindings (0);
- for (gnat_statement = First (Statements (gnat_when));
- Present (gnat_statement);
- gnat_statement = Next (gnat_statement))
- gnat_to_code (gnat_statement);
-
- /* Communicate to GCC that we are done with the current WHEN,
- i.e. insert a "break" statement. */
- expand_exit_something ();
- expand_end_bindings (getdecls (), kept_level_p (), -1);
- poplevel (kept_level_p (), 1, 0);
- }
-
- expand_end_case (gnu_expr);
- }
+ gnu_result = Case_Statement_to_gnu (gnat_node);
break;
case N_Loop_Statement:
- {
- /* The loop variable in GCC form, if any. */
- tree gnu_loop_var = NULL_TREE;
- /* PREINCREMENT_EXPR or PREDECREMENT_EXPR. */
- enum tree_code gnu_update = ERROR_MARK;
- /* Used if this is a named loop for so EXIT can work. */
- struct nesting *loop_id;
- /* Condition to continue loop tested at top of loop. */
- tree gnu_top_condition = integer_one_node;
- /* Similar, but tested at bottom of loop. */
- tree gnu_bottom_condition = integer_one_node;
- Node_Id gnat_statement;
- Node_Id gnat_iter_scheme = Iteration_Scheme (gnat_node);
- Node_Id gnat_top_condition = Empty;
- int enclosing_if_p = 0;
-
- /* Set the condition that under which the loop should continue.
- For "LOOP .... END LOOP;" the condition is always true. */
- if (No (gnat_iter_scheme))
- ;
- /* The case "WHILE condition LOOP ..... END LOOP;" */
- else if (Present (Condition (gnat_iter_scheme)))
- gnat_top_condition = Condition (gnat_iter_scheme);
- else
- {
- /* We have an iteration scheme. */
- Node_Id gnat_loop_spec
- = Loop_Parameter_Specification (gnat_iter_scheme);
- Entity_Id gnat_loop_var = Defining_Entity (gnat_loop_spec);
- Entity_Id gnat_type = Etype (gnat_loop_var);
- tree gnu_type = get_unpadded_type (gnat_type);
- tree gnu_low = TYPE_MIN_VALUE (gnu_type);
- tree gnu_high = TYPE_MAX_VALUE (gnu_type);
- int reversep = Reverse_Present (gnat_loop_spec);
- tree gnu_first = reversep ? gnu_high : gnu_low;
- tree gnu_last = reversep ? gnu_low : gnu_high;
- enum tree_code end_code = reversep ? GE_EXPR : LE_EXPR;
- tree gnu_base_type = get_base_type (gnu_type);
- tree gnu_limit
- = (reversep ? TYPE_MIN_VALUE (gnu_base_type)
- : TYPE_MAX_VALUE (gnu_base_type));
-
- /* We know the loop variable will not overflow if GNU_LAST is
- a constant and is not equal to GNU_LIMIT. If it might
- overflow, we have to move the limit test to the end of
- the loop. In that case, we have to test for an
- empty loop outside the loop. */
- if (TREE_CODE (gnu_last) != INTEGER_CST
- || TREE_CODE (gnu_limit) != INTEGER_CST
- || tree_int_cst_equal (gnu_last, gnu_limit))
- {
- gnu_expr = build_binary_op (LE_EXPR, integer_type_node,
- gnu_low, gnu_high);
- set_lineno (gnat_loop_spec, 1);
- expand_start_cond (gnu_expr, 0);
- enclosing_if_p = 1;
- }
-
- /* Open a new nesting level that will surround the loop to declare
- the loop index variable. */
- pushlevel (0);
- expand_start_bindings (0);
-
- /* Declare the loop index and set it to its initial value. */
- gnu_loop_var = gnat_to_gnu_entity (gnat_loop_var, gnu_first, 1);
- if (DECL_BY_REF_P (gnu_loop_var))
- gnu_loop_var = build_unary_op (INDIRECT_REF, NULL_TREE,
- gnu_loop_var);
-
- /* The loop variable might be a padded type, so use `convert' to
- get a reference to the inner variable if so. */
- gnu_loop_var = convert (get_base_type (gnu_type), gnu_loop_var);
-
- /* Set either the top or bottom exit condition as
- appropriate depending on whether we know an overflow
- cannot occur or not. */
- if (enclosing_if_p)
- gnu_bottom_condition
- = build_binary_op (NE_EXPR, integer_type_node,
- gnu_loop_var, gnu_last);
- else
- gnu_top_condition
- = build_binary_op (end_code, integer_type_node,
- gnu_loop_var, gnu_last);
-
- gnu_update = reversep ? PREDECREMENT_EXPR : PREINCREMENT_EXPR;
- }
-
- set_lineno (gnat_node, 1);
- if (gnu_loop_var)
- loop_id = expand_start_loop_continue_elsewhere (1);
- else
- loop_id = expand_start_loop (1);
-
- /* If the loop was named, have the name point to this loop. In this
- case, the association is not a ..._DECL node; in fact, it isn't
- a GCC tree node at all. Since this name is referenced inside
- the loop, do it before we process the statements of the loop. */
- if (Present (Identifier (gnat_node)))
- {
- tree gnu_loop_id = make_node (GNAT_LOOP_ID);
-
- TREE_LOOP_ID (gnu_loop_id) = loop_id;
- save_gnu_tree (Entity (Identifier (gnat_node)), gnu_loop_id, 1);
- }
-
- set_lineno (gnat_node, 1);
-
- /* We must evaluate the condition after we've entered the
- loop so that any expression actions get done in the right
- place. */
- if (Present (gnat_top_condition))
- gnu_top_condition = gnat_to_gnu (gnat_top_condition);
-
- expand_exit_loop_top_cond (0, gnu_top_condition);
-
- /* Make the loop body into its own block, so any allocated
- storage will be released every iteration. This is needed
- for stack allocation. */
-
- pushlevel (0);
- gnu_block_stack
- = tree_cons (gnu_bottom_condition, NULL_TREE, gnu_block_stack);
- expand_start_bindings (0);
-
- for (gnat_statement = First (Statements (gnat_node));
- Present (gnat_statement);
- gnat_statement = Next (gnat_statement))
- gnat_to_code (gnat_statement);
-
- expand_end_bindings (getdecls (), kept_level_p (), -1);
- poplevel (kept_level_p (), 1, 0);
- gnu_block_stack = TREE_CHAIN (gnu_block_stack);
-
- set_lineno (gnat_node, 1);
- expand_exit_loop_if_false (0, gnu_bottom_condition);
-
- if (gnu_loop_var)
- {
- expand_loop_continue_here ();
- gnu_expr = build_binary_op (gnu_update, TREE_TYPE (gnu_loop_var),
- gnu_loop_var,
- convert (TREE_TYPE (gnu_loop_var),
- integer_one_node));
- set_lineno (gnat_iter_scheme, 1);
- expand_expr_stmt (gnu_expr);
- }
-
- set_lineno (gnat_node, 1);
- expand_end_loop ();
-
- if (gnu_loop_var)
- {
- /* Close the nesting level that sourround the loop that was used to
- declare the loop index variable. */
- set_lineno (gnat_node, 1);
- expand_end_bindings (getdecls (), 1, -1);
- poplevel (1, 1, 0);
- }
-
- if (enclosing_if_p)
- {
- set_lineno (gnat_node, 1);
- expand_end_cond ();
- }
- }
+ gnu_result = Loop_Statement_to_gnu (gnat_node);
break;
case N_Block_Statement:
- pushlevel (0);
- gnu_block_stack = tree_cons (NULL_TREE, NULL_TREE, gnu_block_stack);
- expand_start_bindings (0);
- process_decls (Declarations (gnat_node), Empty, Empty, 1, 1);
- gnat_to_code (Handled_Statement_Sequence (gnat_node));
- expand_end_bindings (getdecls (), kept_level_p (), -1);
- poplevel (kept_level_p (), 1, 0);
- gnu_block_stack = TREE_CHAIN (gnu_block_stack);
+ start_stmt_group ();
+ gnat_pushlevel ();
+ process_decls (Declarations (gnat_node), Empty, Empty, true, true);
+ add_stmt (gnat_to_gnu (Handled_Statement_Sequence (gnat_node)));
+ gnat_poplevel ();
+ gnu_result = end_stmt_group ();
+
if (Present (Identifier (gnat_node)))
mark_out_of_scope (Entity (Identifier (gnat_node)));
break;
case N_Exit_Statement:
- {
- /* Which loop to exit, NULL if the current loop. */
- struct nesting *loop_id = 0;
- /* The GCC version of the optional GNAT condition node attached to the
- exit statement. Exit the loop if this is false. */
- tree gnu_cond = integer_zero_node;
-
- if (Present (Name (gnat_node)))
- loop_id
- = TREE_LOOP_ID (get_gnu_tree (Entity (Name (gnat_node))));
-
- if (Present (Condition (gnat_node)))
- gnu_cond = invert_truthvalue (gnat_truthvalue_conversion
- (gnat_to_gnu (Condition (gnat_node))));
-
- set_lineno (gnat_node, 1);
- expand_exit_loop_if_false (loop_id, gnu_cond);
- }
+ gnu_result
+ = build2 (EXIT_STMT, void_type_node,
+ (Present (Condition (gnat_node))
+ ? gnat_to_gnu (Condition (gnat_node)) : NULL_TREE),
+ (Present (Name (gnat_node))
+ ? get_gnu_tree (Entity (Name (gnat_node)))
+ : TREE_VALUE (gnu_loop_label_stack)));
break;
case N_Return_Statement:
/* The gnu function type of the subprogram currently processed. */
tree gnu_subprog_type = TREE_TYPE (current_function_decl);
/* The return value from the subprogram. */
- tree gnu_ret_val = 0;
+ tree gnu_ret_val = NULL_TREE;
+ /* The place to put the return value. */
+ tree gnu_lhs;
/* If we are dealing with a "return;" from an Ada procedure with
parameters passed by copy in copy out, we need to return a record
But if we have a return label defined, convert this into
a branch to that label. */
- if (TREE_VALUE (gnu_return_label_stack) != 0)
+ if (TREE_VALUE (gnu_return_label_stack))
{
- gnu_result = build_nt (GOTO_STMT,
- TREE_VALUE (gnu_return_label_stack));
+ gnu_result = build1 (GOTO_EXPR, void_type_node,
+ TREE_VALUE (gnu_return_label_stack));
break;
}
- else if (TYPE_CI_CO_LIST (gnu_subprog_type) != NULL_TREE)
+ else if (TYPE_CI_CO_LIST (gnu_subprog_type))
{
+ gnu_lhs = DECL_RESULT (current_function_decl);
if (list_length (TYPE_CI_CO_LIST (gnu_subprog_type)) == 1)
gnu_ret_val = TREE_VALUE (TYPE_CI_CO_LIST (gnu_subprog_type));
else
gnu_ret_val
= gnat_build_constructor (TREE_TYPE (gnu_subprog_type),
- TYPE_CI_CO_LIST (gnu_subprog_type));
+ TYPE_CI_CO_LIST (gnu_subprog_type));
}
/* If the Ada subprogram is a function, we just need to return the
else if (Present (Expression (gnat_node)))
{
- gnu_ret_val = gnat_to_gnu (Expression (gnat_node));
-
- /* Do not remove the padding from GNU_RET_VAL if the inner
- type is self-referential since we want to allocate the fixed
- size in that case. */
- if (TREE_CODE (gnu_ret_val) == COMPONENT_REF
- && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_ret_val, 0)))
- == RECORD_TYPE)
- && (TYPE_IS_PADDING_P
- (TREE_TYPE (TREE_OPERAND (gnu_ret_val, 0))))
- && (CONTAINS_PLACEHOLDER_P
- (TYPE_SIZE (TREE_TYPE (gnu_ret_val)))))
- gnu_ret_val = TREE_OPERAND (gnu_ret_val, 0);
-
- if (TYPE_RETURNS_BY_REF_P (gnu_subprog_type)
- || By_Ref (gnat_node))
- gnu_ret_val = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_ret_val);
-
- else if (TYPE_RETURNS_UNCONSTRAINED_P (gnu_subprog_type))
+ /* If the current function returns by target pointer and we
+ are doing a call, pass that target to the call. */
+ if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type)
+ && Nkind (Expression (gnat_node)) == N_Function_Call)
{
- gnu_ret_val = maybe_unconstrained_array (gnu_ret_val);
-
- /* We have two cases: either the function returns with
- depressed stack or not. If not, we allocate on the
- secondary stack. If so, we allocate in the stack frame.
- if no copy is needed, the front end will set By_Ref,
- which we handle in the case above. */
- if (TYPE_RETURNS_STACK_DEPRESSED (gnu_subprog_type))
- gnu_ret_val
- = build_allocator (TREE_TYPE (gnu_ret_val), gnu_ret_val,
- TREE_TYPE (gnu_subprog_type), 0, -1,
- gnat_node);
+ gnu_lhs
+ = build_unary_op (INDIRECT_REF, NULL_TREE,
+ DECL_ARGUMENTS (current_function_decl));
+ gnu_result = call_to_gnu (Expression (gnat_node),
+ &gnu_result_type, gnu_lhs);
+ }
+ else
+ {
+ gnu_ret_val = gnat_to_gnu (Expression (gnat_node));
+
+ if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type))
+ /* The original return type was unconstrained so dereference
+ the TARGET pointer in the actual return value's type. */
+ gnu_lhs
+ = build_unary_op (INDIRECT_REF, TREE_TYPE (gnu_ret_val),
+ DECL_ARGUMENTS (current_function_decl));
else
+ gnu_lhs = DECL_RESULT (current_function_decl);
+
+ /* Do not remove the padding from GNU_RET_VAL if the inner
+ type is self-referential since we want to allocate the fixed
+ size in that case. */
+ if (TREE_CODE (gnu_ret_val) == COMPONENT_REF
+ && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_ret_val, 0)))
+ == RECORD_TYPE)
+ && (TYPE_IS_PADDING_P
+ (TREE_TYPE (TREE_OPERAND (gnu_ret_val, 0))))
+ && (CONTAINS_PLACEHOLDER_P
+ (TYPE_SIZE (TREE_TYPE (gnu_ret_val)))))
+ gnu_ret_val = TREE_OPERAND (gnu_ret_val, 0);
+
+ if (TYPE_RETURNS_BY_REF_P (gnu_subprog_type)
+ || By_Ref (gnat_node))
gnu_ret_val
- = build_allocator (TREE_TYPE (gnu_ret_val), gnu_ret_val,
- TREE_TYPE (gnu_subprog_type),
- Procedure_To_Call (gnat_node),
- Storage_Pool (gnat_node), gnat_node);
+ = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_ret_val);
+
+ else if (TYPE_RETURNS_UNCONSTRAINED_P (gnu_subprog_type))
+ {
+ gnu_ret_val = maybe_unconstrained_array (gnu_ret_val);
+
+ /* We have two cases: either the function returns with
+ depressed stack or not. If not, we allocate on the
+ secondary stack. If so, we allocate in the stack frame.
+ if no copy is needed, the front end will set By_Ref,
+ which we handle in the case above. */
+ if (TYPE_RETURNS_STACK_DEPRESSED (gnu_subprog_type))
+ gnu_ret_val
+ = build_allocator (TREE_TYPE (gnu_ret_val),
+ gnu_ret_val,
+ TREE_TYPE (gnu_subprog_type),
+ 0, -1, gnat_node, false);
+ else
+ gnu_ret_val
+ = build_allocator (TREE_TYPE (gnu_ret_val),
+ gnu_ret_val,
+ TREE_TYPE (gnu_subprog_type),
+ Procedure_To_Call (gnat_node),
+ Storage_Pool (gnat_node),
+ gnat_node, false);
+ }
}
}
+ else
+ /* If the Ada subprogram is a regular procedure, just return. */
+ gnu_lhs = NULL_TREE;
+
+ if (TYPE_RETURNS_BY_TARGET_PTR_P (gnu_subprog_type))
+ {
+ if (gnu_ret_val)
+ gnu_result = build_binary_op (MODIFY_EXPR, NULL_TREE,
+ gnu_lhs, gnu_ret_val);
+ add_stmt_with_node (gnu_result, gnat_node);
+ gnu_lhs = NULL_TREE;
+ }
- gnu_result = build_nt (RETURN_STMT, gnu_ret_val);
+ gnu_result = build_return_expr (gnu_lhs, gnu_ret_val);
}
break;
case N_Goto_Statement:
- gnu_result = build_nt (GOTO_STMT, gnat_to_gnu (Name (gnat_node)));
+ gnu_result = build1 (GOTO_EXPR, void_type_node,
+ gnat_to_gnu (Name (gnat_node)));
break;
/****************************/
/* Unless there is a freeze node, declare the subprogram. We consider
this a "definition" even though we're not generating code for
the subprogram because we will be making the corresponding GCC
- node here. */
+ node here. */
if (No (Freeze_Node (Defining_Entity (Specification (gnat_node)))))
gnat_to_gnu_entity (Defining_Entity (Specification (gnat_node)),
NULL_TREE, 1);
-
+ gnu_result = alloc_stmt_list ();
break;
case N_Abstract_Subprogram_Declaration:
/* This subprogram doesn't exist for code generation purposes, but we
- have to elaborate the types of any parameters, unless they are
- imported types (nothing to generate in this case). */
+ have to elaborate the types of any parameters and result, unless
+ they are imported types (nothing to generate in this case). */
+
+ /* Process the parameter types first. */
+
for (gnat_temp
- = First_Formal (Defining_Entity (Specification (gnat_node)));
+ = First_Formal_With_Extras
+ (Defining_Entity (Specification (gnat_node)));
Present (gnat_temp);
gnat_temp = Next_Formal_With_Extras (gnat_temp))
if (Is_Itype (Etype (gnat_temp))
&& !From_With_Type (Etype (gnat_temp)))
gnat_to_gnu_entity (Etype (gnat_temp), NULL_TREE, 0);
+
+ /* Then the result type, set to Standard_Void_Type for procedures. */
+
+ {
+ Entity_Id gnat_temp_type
+ = Etype (Defining_Entity (Specification (gnat_node)));
+
+ if (Is_Itype (gnat_temp_type) && !From_With_Type (gnat_temp_type))
+ gnat_to_gnu_entity (Etype (gnat_temp_type), NULL_TREE, 0);
+ }
+
+ gnu_result = alloc_stmt_list ();
break;
case N_Defining_Program_Unit_Name:
/* For a child unit identifier go up a level to get the
- specificaton. We get this when we try to find the spec of
+ specification. We get this when we try to find the spec of
a child unit package that is the compilation unit being compiled. */
- gnat_to_code (Parent (gnat_node));
+ gnu_result = gnat_to_gnu (Parent (gnat_node));
break;
case N_Subprogram_Body:
- {
- /* Save debug output mode in case it is reset. */
- enum debug_info_type save_write_symbols = write_symbols;
- const struct gcc_debug_hooks *const save_debug_hooks = debug_hooks;
- /* Definining identifier of a parameter to the subprogram. */
- Entity_Id gnat_param;
- /* The defining identifier for the subprogram body. Note that if a
- specification has appeared before for this body, then the identifier
- occurring in that specification will also be a defining identifier
- and all the calls to this subprogram will point to that
- specification. */
- Entity_Id gnat_subprog_id
- = (Present (Corresponding_Spec (gnat_node))
- ? Corresponding_Spec (gnat_node) : Defining_Entity (gnat_node));
-
- /* The FUNCTION_DECL node corresponding to the subprogram spec. */
- tree gnu_subprog_decl;
- /* The FUNCTION_TYPE node corresponding to the subprogram spec. */
- tree gnu_subprog_type;
- tree gnu_cico_list;
-
- /* If this is a generic object or if it has been eliminated,
- ignore it. */
-
- if (Ekind (gnat_subprog_id) == E_Generic_Procedure
- || Ekind (gnat_subprog_id) == E_Generic_Function
- || Is_Eliminated (gnat_subprog_id))
- break;
-
- /* If debug information is suppressed for the subprogram,
- turn debug mode off for the duration of processing. */
- if (!Needs_Debug_Info (gnat_subprog_id))
- {
- write_symbols = NO_DEBUG;
- debug_hooks = &do_nothing_debug_hooks;
- }
-
- /* If this subprogram acts as its own spec, define it. Otherwise,
- just get the already-elaborated tree node. However, if this
- subprogram had its elaboration deferred, we will already have
- made a tree node for it. So treat it as not being defined in
- that case. Such a subprogram cannot have an address clause or
- a freeze node, so this test is safe, though it does disable
- some otherwise-useful error checking. */
- gnu_subprog_decl
- = gnat_to_gnu_entity (gnat_subprog_id, NULL_TREE,
- Acts_As_Spec (gnat_node)
- && ! present_gnu_tree (gnat_subprog_id));
-
- gnu_subprog_type = TREE_TYPE (gnu_subprog_decl);
-
- /* ??? Temporarily do this to avoid GC throwing away outer stuff. */
- ggc_push_context ();
-
- /* Set the line number in the decl to correspond to that of
- the body so that the line number notes are written
- correctly. */
- set_lineno (gnat_node, 0);
- DECL_SOURCE_LOCATION (gnu_subprog_decl) = input_location;
-
- begin_subprog_body (gnu_subprog_decl);
-
- /* There used to be a second call to set_lineno here, with
- write_note_p set, but begin_subprog_body actually already emits the
- note we want (via init_function_start).
-
- Emitting a second note here was necessary for -ftest-coverage with
- GCC 2.8.1, as the first one was skipped by branch_prob. This is no
- longer the case with GCC 3.x, so emitting a second note here would
- result in having the first line of the subprogram counted twice by
- gcov. */
-
- pushlevel (0);
- gnu_block_stack = tree_cons (NULL_TREE, NULL_TREE, gnu_block_stack);
- expand_start_bindings (0);
-
- gnu_cico_list = TYPE_CI_CO_LIST (gnu_subprog_type);
-
- /* If there are OUT parameters, we need to ensure that the
- return statement properly copies them out. We do this by
- making a new block and converting any inner return into a goto
- to a label at the end of the block. */
-
- if (gnu_cico_list != 0)
- {
- gnu_return_label_stack
- = tree_cons (NULL_TREE,
- build_decl (LABEL_DECL, NULL_TREE, NULL_TREE),
- gnu_return_label_stack);
- pushlevel (0);
- expand_start_bindings (0);
- }
- else
- gnu_return_label_stack
- = tree_cons (NULL_TREE, NULL_TREE, gnu_return_label_stack);
-
- /* See if there are any parameters for which we don't yet have
- GCC entities. These must be for OUT parameters for which we
- will be making VAR_DECL nodes here. Fill them in to
- TYPE_CI_CO_LIST, which must contain the empty entry as well.
- We can match up the entries because TYPE_CI_CO_LIST is in the
- order of the parameters. */
-
- for (gnat_param = First_Formal (gnat_subprog_id);
- Present (gnat_param);
- gnat_param = Next_Formal_With_Extras (gnat_param))
- if (present_gnu_tree (gnat_param))
- adjust_decl_rtl (get_gnu_tree (gnat_param));
- else
- {
- /* Skip any entries that have been already filled in; they
- must correspond to IN OUT parameters. */
- for (; gnu_cico_list != 0 && TREE_VALUE (gnu_cico_list) != 0;
- gnu_cico_list = TREE_CHAIN (gnu_cico_list))
- ;
-
- /* Do any needed references for padded types. */
- TREE_VALUE (gnu_cico_list)
- = convert (TREE_TYPE (TREE_PURPOSE (gnu_cico_list)),
- gnat_to_gnu_entity (gnat_param, NULL_TREE, 1));
- }
-
- process_decls (Declarations (gnat_node), Empty, Empty, 1, 1);
-
- /* Generate the code of the subprogram itself. A return statement
- will be present and any OUT parameters will be handled there. */
- gnat_to_code (Handled_Statement_Sequence (gnat_node));
-
- expand_end_bindings (getdecls (), kept_level_p (), -1);
- poplevel (kept_level_p (), 1, 0);
- gnu_block_stack = TREE_CHAIN (gnu_block_stack);
-
- if (TREE_VALUE (gnu_return_label_stack) != 0)
- {
- tree gnu_retval;
-
- expand_end_bindings (NULL_TREE, kept_level_p (), -1);
- poplevel (kept_level_p (), 1, 0);
- expand_label (TREE_VALUE (gnu_return_label_stack));
-
- gnu_cico_list = TYPE_CI_CO_LIST (gnu_subprog_type);
- set_lineno (gnat_node, 1);
- if (list_length (gnu_cico_list) == 1)
- gnu_retval = TREE_VALUE (gnu_cico_list);
- else
- gnu_retval = gnat_build_constructor (TREE_TYPE (gnu_subprog_type),
- gnu_cico_list);
-
- if (DECL_P (gnu_retval) && DECL_BY_REF_P (gnu_retval))
- gnu_retval
- = build_unary_op (INDIRECT_REF, NULL_TREE, gnu_retval);
-
- expand_return
- (build_binary_op (MODIFY_EXPR, NULL_TREE,
- DECL_RESULT (current_function_decl),
- gnu_retval));
-
- }
-
- gnu_return_label_stack = TREE_CHAIN (gnu_return_label_stack);
-
- /* Disconnect the trees for parameters that we made variables for
- from the GNAT entities since these will become unusable after
- we end the function. */
- for (gnat_param = First_Formal (gnat_subprog_id);
- Present (gnat_param);
- gnat_param = Next_Formal_With_Extras (gnat_param))
- if (TREE_CODE (get_gnu_tree (gnat_param)) == VAR_DECL)
- save_gnu_tree (gnat_param, NULL_TREE, 0);
-
- end_subprog_body ();
- mark_out_of_scope (Defining_Unit_Name (Specification (gnat_node)));
- write_symbols = save_write_symbols;
- debug_hooks = save_debug_hooks;
- ggc_pop_context ();
- }
+ Subprogram_Body_to_gnu (gnat_node);
+ gnu_result = alloc_stmt_list ();
break;
case N_Function_Call:
case N_Procedure_Call_Statement:
- {
- /* The GCC node corresponding to the GNAT subprogram name. This can
- either be a FUNCTION_DECL node if we are dealing with a standard
- subprogram call, or an indirect reference expression (an
- INDIRECT_REF node) pointing to a subprogram. */
- tree gnu_subprog_node = gnat_to_gnu (Name (gnat_node));
- /* The FUNCTION_TYPE node giving the GCC type of the subprogram. */
- tree gnu_subprog_type = TREE_TYPE (gnu_subprog_node);
- tree gnu_subprog_addr
- = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_subprog_node);
- Entity_Id gnat_formal;
- Node_Id gnat_actual;
- tree gnu_actual_list = NULL_TREE;
- tree gnu_name_list = NULL_TREE;
- tree gnu_before_list = NULL_TREE;
- tree gnu_after_list = NULL_TREE;
- tree gnu_subprog_call;
-
- switch (Nkind (Name (gnat_node)))
- {
- case N_Identifier:
- case N_Operator_Symbol:
- case N_Expanded_Name:
- case N_Attribute_Reference:
- if (Is_Eliminated (Entity (Name (gnat_node))))
- Eliminate_Error_Msg (gnat_node, Entity (Name (gnat_node)));
- }
-
- if (TREE_CODE (gnu_subprog_type) != FUNCTION_TYPE)
- gigi_abort (317);
-
- /* If we are calling a stubbed function, make this into a
- raise of Program_Error. Elaborate all our args first. */
-
- if (TREE_CODE (gnu_subprog_node) == FUNCTION_DECL
- && DECL_STUBBED_P (gnu_subprog_node))
- {
- for (gnat_actual = First_Actual (gnat_node);
- Present (gnat_actual);
- gnat_actual = Next_Actual (gnat_actual))
- expand_expr_stmt (gnat_to_gnu (gnat_actual));
-
- if (Nkind (gnat_node) == N_Function_Call)
- {
- gnu_result_type = TREE_TYPE (gnu_subprog_type);
- gnu_result
- = build1 (NULL_EXPR, gnu_result_type,
- build_call_raise (PE_Stubbed_Subprogram_Called));
- }
- else
- gnu_result
- = build_nt (EXPR_STMT,
- build_call_raise (PE_Stubbed_Subprogram_Called));
- break;
- }
-
- /* The only way we can be making a call via an access type is
- if Name is an explicit dereference. In that case, get the
- list of formal args from the type the access type is pointing
- to. Otherwise, get the formals from entity being called. */
- if (Nkind (Name (gnat_node)) == N_Explicit_Dereference)
- gnat_formal = First_Formal (Etype (Name (gnat_node)));
- else if (Nkind (Name (gnat_node)) == N_Attribute_Reference)
- /* Assume here that this must be 'Elab_Body or 'Elab_Spec. */
- gnat_formal = 0;
- else
- gnat_formal = First_Formal (Entity (Name (gnat_node)));
-
- /* Create the list of the actual parameters as GCC expects it, namely
- a chain of TREE_LIST nodes in which the TREE_VALUE field of each
- node is a parameter-expression and the TREE_PURPOSE field is
- null. Skip OUT parameters that are not passed by reference and
- don't need to be copied in. */
-
- for (gnat_actual = First_Actual (gnat_node);
- Present (gnat_actual);
- gnat_formal = Next_Formal_With_Extras (gnat_formal),
- gnat_actual = Next_Actual (gnat_actual))
- {
- tree gnu_formal_type = gnat_to_gnu_type (Etype (gnat_formal));
- /* We treat a conversion between aggregate types as if it
- is an unchecked conversion. */
- int unchecked_convert_p
- = (Nkind (gnat_actual) == N_Unchecked_Type_Conversion
- || (Nkind (gnat_actual) == N_Type_Conversion
- && Is_Composite_Type (Underlying_Type
- (Etype (gnat_formal)))));
- Node_Id gnat_name
- = unchecked_convert_p ? Expression (gnat_actual) : gnat_actual;
- tree gnu_name = gnat_to_gnu (gnat_name);
- tree gnu_name_type = gnat_to_gnu_type (Etype (gnat_name));
- tree gnu_actual;
-
- /* If it's possible we may need to use this expression twice,
- make sure than any side-effects are handled via SAVE_EXPRs.
- Likewise if we need to force side-effects before the call.
- ??? This is more conservative than we need since we don't
- need to do this for pass-by-ref with no conversion.
- If we are passing a non-addressable Out or In Out parameter by
- reference, pass the address of a copy and set up to copy back
- out after the call. */
-
- if (Ekind (gnat_formal) != E_In_Parameter)
- {
- gnu_name = gnat_stabilize_reference (gnu_name, 1);
- if (! addressable_p (gnu_name)
- && present_gnu_tree (gnat_formal)
- && (DECL_BY_REF_P (get_gnu_tree (gnat_formal))
- || (TREE_CODE (get_gnu_tree (gnat_formal)) == PARM_DECL
- && (DECL_BY_COMPONENT_PTR_P
- (get_gnu_tree (gnat_formal))
- || DECL_BY_DESCRIPTOR_P
- (get_gnu_tree (gnat_formal))))))
- {
- tree gnu_copy = gnu_name;
- tree gnu_temp;
-
- /* Remove any unpadding on the actual and make a copy.
- But if the actual is a left-justified modular type,
- first convert to it. */
- if (TREE_CODE (gnu_name) == COMPONENT_REF
- && ((TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_name, 0)))
- == RECORD_TYPE)
- && (TYPE_IS_PADDING_P
- (TREE_TYPE (TREE_OPERAND (gnu_name, 0))))))
- gnu_name = gnu_copy = TREE_OPERAND (gnu_name, 0);
- else if (TREE_CODE (gnu_name_type) == RECORD_TYPE
- && (TYPE_LEFT_JUSTIFIED_MODULAR_P
- (gnu_name_type)))
- gnu_name = convert (gnu_name_type, gnu_name);
-
- gnu_actual = save_expr (gnu_name);
-
- /* Since we're going to take the address of the SAVE_EXPR,
- we don't want it to be marked as unchanging.
- So set TREE_ADDRESSABLE. */
- gnu_temp = skip_simple_arithmetic (gnu_actual);
- if (TREE_CODE (gnu_temp) == SAVE_EXPR)
- {
- TREE_ADDRESSABLE (gnu_temp) = 1;
- TREE_READONLY (gnu_temp) = 0;
- }
-
- /* Set up to move the copy back to the original. */
- gnu_temp
- = build_nt (EXPR_STMT,
- build (MODIFY_EXPR, TREE_TYPE (gnu_copy),
- gnu_copy, gnu_actual));
-
- TREE_TYPE (gnu_temp) = void_type_node;
- TREE_SLOC (gnu_temp) = Sloc (gnat_actual);
- TREE_CHAIN (gnu_temp) = gnu_after_list;
- gnu_after_list = gnu_temp;
- }
- }
-
- /* If this was a procedure call, we may not have removed any
- padding. So do it here for the part we will use as an
- input, if any. */
- gnu_actual = gnu_name;
- if (Ekind (gnat_formal) != E_Out_Parameter
- && TREE_CODE (TREE_TYPE (gnu_actual)) == RECORD_TYPE
- && TYPE_IS_PADDING_P (TREE_TYPE (gnu_actual)))
- gnu_actual = convert (get_unpadded_type (Etype (gnat_actual)),
- gnu_actual);
-
- if (Ekind (gnat_formal) != E_Out_Parameter
- && ! unchecked_convert_p
- && Do_Range_Check (gnat_actual))
- gnu_actual = emit_range_check (gnu_actual, Etype (gnat_formal));
-
- /* Do any needed conversions. We need only check for
- unchecked conversion since normal conversions will be handled
- by just converting to the formal type. */
- if (unchecked_convert_p)
- {
- gnu_actual
- = unchecked_convert (gnat_to_gnu_type (Etype (gnat_actual)),
- gnu_actual,
- (Nkind (gnat_actual)
- == N_Unchecked_Type_Conversion)
- && No_Truncation (gnat_actual));
-
- /* One we've done the unchecked conversion, we still
- must ensure that the object is in range of the formal's
- type. */
- if (Ekind (gnat_formal) != E_Out_Parameter
- && Do_Range_Check (gnat_actual))
- gnu_actual = emit_range_check (gnu_actual,
- Etype (gnat_formal));
- }
- else if (TREE_CODE (gnu_actual) != SAVE_EXPR)
- /* We may have suppressed a conversion to the Etype of the
- actual since the parent is a procedure call. So add the
- conversion here. */
- gnu_actual = convert (gnat_to_gnu_type (Etype (gnat_actual)),
- gnu_actual);
-
- if (TREE_CODE (gnu_actual) != SAVE_EXPR)
- gnu_actual = convert (gnu_formal_type, gnu_actual);
-
- /* If we have not saved a GCC object for the formal, it means it
- is an OUT parameter not passed by reference and that does not
- need to be copied in. Otherwise, look at the PARM_DECL to see
- if it is passed by reference. */
- if (present_gnu_tree (gnat_formal)
- && TREE_CODE (get_gnu_tree (gnat_formal)) == PARM_DECL
- && DECL_BY_REF_P (get_gnu_tree (gnat_formal)))
- {
- if (Ekind (gnat_formal) != E_In_Parameter)
- {
- gnu_actual = gnu_name;
-
- /* If we have a padded type, be sure we've removed the
- padding. */
- if (TREE_CODE (TREE_TYPE (gnu_actual)) == RECORD_TYPE
- && TYPE_IS_PADDING_P (TREE_TYPE (gnu_actual))
- && TREE_CODE (gnu_actual) != SAVE_EXPR)
- gnu_actual
- = convert (get_unpadded_type (Etype (gnat_actual)),
- gnu_actual);
- }
-
- /* Otherwise, if we have a non-addressable COMPONENT_REF of a
- variable-size type see if it's doing a unpadding operation.
- If so, remove that operation since we have no way of
- allocating the required temporary. */
- if (TREE_CODE (gnu_actual) == COMPONENT_REF
- && ! TREE_CONSTANT (TYPE_SIZE (TREE_TYPE (gnu_actual)))
- && (TREE_CODE (TREE_TYPE (TREE_OPERAND (gnu_actual, 0)))
- == RECORD_TYPE)
- && TYPE_IS_PADDING_P (TREE_TYPE
- (TREE_OPERAND (gnu_actual, 0)))
- && !addressable_p (gnu_actual))
- gnu_actual = TREE_OPERAND (gnu_actual, 0);
-
- /* The symmetry of the paths to the type of an entity is
- broken here since arguments don't know that they will
- be passed by ref. */
- gnu_formal_type = TREE_TYPE (get_gnu_tree (gnat_formal));
- gnu_actual = build_unary_op (ADDR_EXPR, gnu_formal_type,
- gnu_actual);
- }
- else if (present_gnu_tree (gnat_formal)
- && TREE_CODE (get_gnu_tree (gnat_formal)) == PARM_DECL
- && DECL_BY_COMPONENT_PTR_P (get_gnu_tree (gnat_formal)))
- {
- gnu_formal_type = TREE_TYPE (get_gnu_tree (gnat_formal));
- gnu_actual = maybe_implicit_deref (gnu_actual);
- gnu_actual = maybe_unconstrained_array (gnu_actual);
-
- if (TREE_CODE (gnu_formal_type) == RECORD_TYPE
- && TYPE_IS_PADDING_P (gnu_formal_type))
- {
- gnu_formal_type
- = TREE_TYPE (TYPE_FIELDS (gnu_formal_type));
- gnu_actual = convert (gnu_formal_type, gnu_actual);
- }
-
- /* Take the address of the object and convert to the
- proper pointer type. We'd like to actually compute
- the address of the beginning of the array using
- an ADDR_EXPR of an ARRAY_REF, but there's a possibility
- that the ARRAY_REF might return a constant and we'd
- be getting the wrong address. Neither approach is
- exactly correct, but this is the most likely to work
- in all cases. */
- gnu_actual = convert (gnu_formal_type,
- build_unary_op (ADDR_EXPR, NULL_TREE,
- gnu_actual));
- }
- else if (present_gnu_tree (gnat_formal)
- && TREE_CODE (get_gnu_tree (gnat_formal)) == PARM_DECL
- && DECL_BY_DESCRIPTOR_P (get_gnu_tree (gnat_formal)))
- {
- /* If arg is 'Null_Parameter, pass zero descriptor. */
- if ((TREE_CODE (gnu_actual) == INDIRECT_REF
- || TREE_CODE (gnu_actual) == UNCONSTRAINED_ARRAY_REF)
- && TREE_PRIVATE (gnu_actual))
- gnu_actual
- = convert (DECL_ARG_TYPE (get_gnu_tree (gnat_formal)),
- integer_zero_node);
- else
- gnu_actual
- = build_unary_op (ADDR_EXPR, NULL_TREE,
- fill_vms_descriptor (gnu_actual,
- gnat_formal));
- }
- else
- {
- tree gnu_actual_size = TYPE_SIZE (TREE_TYPE (gnu_actual));
-
- if (Ekind (gnat_formal) != E_In_Parameter)
- gnu_name_list
- = chainon (gnu_name_list,
- build_tree_list (NULL_TREE, gnu_name));
-
- if (! present_gnu_tree (gnat_formal)
- || TREE_CODE (get_gnu_tree (gnat_formal)) != PARM_DECL)
- continue;
-
- /* If this is 'Null_Parameter, pass a zero even though we are
- dereferencing it. */
- else if (TREE_CODE (gnu_actual) == INDIRECT_REF
- && TREE_PRIVATE (gnu_actual)
- && host_integerp (gnu_actual_size, 1)
- && 0 >= compare_tree_int (gnu_actual_size,
- BITS_PER_WORD))
- gnu_actual
- = unchecked_convert
- (DECL_ARG_TYPE (get_gnu_tree (gnat_formal)),
- convert (gnat_type_for_size
- (tree_low_cst (gnu_actual_size, 1), 1),
- integer_zero_node), 0);
- else
- gnu_actual
- = convert (TYPE_MAIN_VARIANT
- (DECL_ARG_TYPE (get_gnu_tree (gnat_formal))),
- gnu_actual);
- }
-
- gnu_actual_list
- = chainon (gnu_actual_list,
- build_tree_list (NULL_TREE, gnu_actual));
- }
-
- gnu_subprog_call = build (CALL_EXPR, TREE_TYPE (gnu_subprog_type),
- gnu_subprog_addr, gnu_actual_list,
- NULL_TREE);
- TREE_SIDE_EFFECTS (gnu_subprog_call) = 1;
-
- /* If it is a function call, the result is the call expression. */
- if (Nkind (gnat_node) == N_Function_Call)
- {
- gnu_result = gnu_subprog_call;
-
- /* If the function returns an unconstrained array or by reference,
- we have to de-dereference the pointer. */
- if (TYPE_RETURNS_UNCONSTRAINED_P (gnu_subprog_type)
- || TYPE_RETURNS_BY_REF_P (gnu_subprog_type))
- gnu_result = build_unary_op (INDIRECT_REF, NULL_TREE,
- gnu_result);
-
- gnu_result_type = get_unpadded_type (Etype (gnat_node));
- break;
- }
-
- /* If this is the case where the GNAT tree contains a procedure call
- but the Ada procedure has copy in copy out parameters, the special
- parameter passing mechanism must be used. */
- else if (TYPE_CI_CO_LIST (gnu_subprog_type) != NULL_TREE)
- {
- /* List of FIELD_DECLs associated with the PARM_DECLs of the copy
- in copy out parameters. */
- tree scalar_return_list = TYPE_CI_CO_LIST (gnu_subprog_type);
- int length = list_length (scalar_return_list);
-
- if (length > 1)
- {
- tree gnu_name;
-
- gnu_subprog_call = protect_multiple_eval (gnu_subprog_call);
-
- /* If any of the names had side-effects, ensure they are
- all evaluated before the call. */
- for (gnu_name = gnu_name_list; gnu_name;
- gnu_name = TREE_CHAIN (gnu_name))
- if (TREE_SIDE_EFFECTS (TREE_VALUE (gnu_name)))
- gnu_subprog_call
- = build (COMPOUND_EXPR, TREE_TYPE (gnu_subprog_call),
- TREE_VALUE (gnu_name), gnu_subprog_call);
- }
-
- if (Nkind (Name (gnat_node)) == N_Explicit_Dereference)
- gnat_formal = First_Formal (Etype (Name (gnat_node)));
- else
- gnat_formal = First_Formal (Entity (Name (gnat_node)));
-
- for (gnat_actual = First_Actual (gnat_node);
- Present (gnat_actual);
- gnat_formal = Next_Formal_With_Extras (gnat_formal),
- gnat_actual = Next_Actual (gnat_actual))
- /* If we are dealing with a copy in copy out parameter, we must
- retrieve its value from the record returned in the function
- call. */
- if (! (present_gnu_tree (gnat_formal)
- && TREE_CODE (get_gnu_tree (gnat_formal)) == PARM_DECL
- && (DECL_BY_REF_P (get_gnu_tree (gnat_formal))
- || ((TREE_CODE (get_gnu_tree (gnat_formal))
- == PARM_DECL)
- && ((DECL_BY_COMPONENT_PTR_P
- (get_gnu_tree (gnat_formal))
- || (DECL_BY_DESCRIPTOR_P
- (get_gnu_tree (gnat_formal))))))))
- && Ekind (gnat_formal) != E_In_Parameter)
- {
- /* Get the value to assign to this OUT or IN OUT
- parameter. It is either the result of the function if
- there is only a single such parameter or the appropriate
- field from the record returned. */
- tree gnu_result
- = length == 1 ? gnu_subprog_call
- : build_component_ref
- (gnu_subprog_call, NULL_TREE,
- TREE_PURPOSE (scalar_return_list), 0);
- int unchecked_conversion
- = Nkind (gnat_actual) == N_Unchecked_Type_Conversion;
- /* If the actual is a conversion, get the inner expression,
- which will be the real destination, and convert the
- result to the type of the actual parameter. */
- tree gnu_actual
- = maybe_unconstrained_array (TREE_VALUE (gnu_name_list));
-
- /* If the result is a padded type, remove the padding. */
- if (TREE_CODE (TREE_TYPE (gnu_result)) == RECORD_TYPE
- && TYPE_IS_PADDING_P (TREE_TYPE (gnu_result)))
- gnu_result
- = convert (TREE_TYPE (TYPE_FIELDS
- (TREE_TYPE (gnu_result))),
- gnu_result);
-
- /* If the result is a type conversion, do it. */
- if (Nkind (gnat_actual) == N_Type_Conversion)
- gnu_result
- = convert_with_check
- (Etype (Expression (gnat_actual)), gnu_result,
- Do_Overflow_Check (gnat_actual),
- Do_Range_Check (Expression (gnat_actual)),
- Float_Truncate (gnat_actual));
-
- else if (unchecked_conversion)
- gnu_result
- = unchecked_convert (TREE_TYPE (gnu_actual), gnu_result,
- No_Truncation (gnat_actual));
- else
- {
- if (Do_Range_Check (gnat_actual))
- gnu_result = emit_range_check (gnu_result,
- Etype (gnat_actual));
-
- if (! (! TREE_CONSTANT (TYPE_SIZE
- (TREE_TYPE (gnu_actual)))
- && TREE_CONSTANT (TYPE_SIZE
- (TREE_TYPE (gnu_result)))))
- gnu_result = convert (TREE_TYPE (gnu_actual),
- gnu_result);
- }
-
- gnu_result
- = build_nt (EXPR_STMT,
- build_binary_op (MODIFY_EXPR, NULL_TREE,
- gnu_actual, gnu_result));
- TREE_TYPE (gnu_result) = void_type_node;
- TREE_SLOC (gnu_result) = Sloc (gnat_actual);
- TREE_CHAIN (gnu_result) = gnu_before_list;
- gnu_before_list = gnu_result;
- scalar_return_list = TREE_CHAIN (scalar_return_list);
- gnu_name_list = TREE_CHAIN (gnu_name_list);
- }
- }
- else
- {
- gnu_before_list = build_nt (EXPR_STMT, gnu_subprog_call);
- TREE_TYPE (gnu_before_list) = void_type_node;
- TREE_SLOC (gnu_before_list) = Sloc (gnat_node);
- }
-
- gnu_result = chainon (nreverse (gnu_before_list),
- nreverse (gnu_after_list));
- if (TREE_CHAIN (gnu_result))
- gnu_result = build_nt (BLOCK_STMT, gnu_result);
- }
+ gnu_result = call_to_gnu (gnat_node, &gnu_result_type, NULL_TREE);
break;
/*************************/
/*************************/
case N_Package_Declaration:
- gnat_to_code (Specification (gnat_node));
+ gnu_result = gnat_to_gnu (Specification (gnat_node));
break;
case N_Package_Specification:
+ start_stmt_group ();
process_decls (Visible_Declarations (gnat_node),
- Private_Declarations (gnat_node), Empty, 1, 1);
+ Private_Declarations (gnat_node), Empty, true, true);
+ gnu_result = end_stmt_group ();
break;
case N_Package_Body:
/* If this is the body of a generic package - do nothing */
if (Ekind (Corresponding_Spec (gnat_node)) == E_Generic_Package)
- break;
+ {
+ gnu_result = alloc_stmt_list ();
+ break;
+ }
- process_decls (Declarations (gnat_node), Empty, Empty, 1, 1);
+ start_stmt_group ();
+ process_decls (Declarations (gnat_node), Empty, Empty, true, true);
if (Present (Handled_Statement_Sequence (gnat_node)))
- {
- gnu_block_stack = tree_cons (NULL_TREE, NULL_TREE, gnu_block_stack);
- gnat_to_code (Handled_Statement_Sequence (gnat_node));
- gnu_block_stack = TREE_CHAIN (gnu_block_stack);
- }
+ add_stmt (gnat_to_gnu (Handled_Statement_Sequence (gnat_node)));
+
+ gnu_result = end_stmt_group ();
break;
/*********************************/
case N_Use_Package_Clause:
case N_Use_Type_Clause:
/* Nothing to do here - but these may appear in list of declarations */
+ gnu_result = alloc_stmt_list ();
break;
/***********************/
/***********************/
case N_Protected_Type_Declaration:
+ gnu_result = alloc_stmt_list ();
break;
case N_Single_Task_Declaration:
gnat_to_gnu_entity (Defining_Entity (gnat_node), NULL_TREE, 1);
+ gnu_result = alloc_stmt_list ();
break;
/***********************************************************/
case N_Compilation_Unit:
- /* For a body, first process the spec if there is one. */
- if (Nkind (Unit (gnat_node)) == N_Package_Body
- || (Nkind (Unit (gnat_node)) == N_Subprogram_Body
- && ! Acts_As_Spec (gnat_node)))
- gnat_to_code (Library_Unit (gnat_node));
-
- process_inlined_subprograms (gnat_node);
-
- if (type_annotate_only && gnat_node == Cunit (Main_Unit))
- {
- elaborate_all_entities (gnat_node);
-
- if (Nkind (Unit (gnat_node)) == N_Subprogram_Declaration
- || Nkind (Unit (gnat_node)) == N_Generic_Package_Declaration
- || Nkind (Unit (gnat_node)) == N_Generic_Subprogram_Declaration)
- break;
- };
-
- process_decls (Declarations (Aux_Decls_Node (gnat_node)),
- Empty, Empty, 1, 1);
-
- gnat_to_code (Unit (gnat_node));
-
- /* Process any pragmas following the unit. */
- if (Present (Pragmas_After (Aux_Decls_Node (gnat_node))))
- for (gnat_temp = First (Pragmas_After (Aux_Decls_Node (gnat_node)));
- gnat_temp; gnat_temp = Next (gnat_temp))
- gnat_to_code (gnat_temp);
-
- /* Put all the Actions into the elaboration routine if we already had
- elaborations. This will happen anyway if they are statements, but we
- want to force declarations there too due to order-of-elaboration
- issues. Most should have Is_Statically_Allocated set. If we
- have had no elaborations, we have no order-of-elaboration issue and
- don't want to create elaborations here. */
- if (Is_Non_Empty_List (Actions (Aux_Decls_Node (gnat_node))))
- for (gnat_temp = First (Actions (Aux_Decls_Node (gnat_node)));
- Present (gnat_temp); gnat_temp = Next (gnat_temp))
- {
- if (pending_elaborations_p ())
- add_pending_elaborations (NULL_TREE,
- make_transform_expr (gnat_temp));
- else
- gnat_to_code (gnat_temp);
- }
-
- /* Generate elaboration code for this unit, if necessary, and
- say whether we did or not. */
- Set_Has_No_Elaboration_Code
- (gnat_node,
- build_unit_elab
- (Defining_Entity (Unit (gnat_node)),
- Nkind (Unit (gnat_node)) == N_Package_Body
- || Nkind (Unit (gnat_node)) == N_Subprogram_Body,
- get_pending_elaborations ()));
+ /* This is not called for the main unit, which is handled in function
+ gigi above. */
+ start_stmt_group ();
+ gnat_pushlevel ();
+ Compilation_Unit_to_gnu (gnat_node);
+ gnu_result = alloc_stmt_list ();
break;
case N_Subprogram_Body_Stub:
case N_Protected_Body_Stub:
case N_Task_Body_Stub:
/* Simply process whatever unit is being inserted. */
- gnat_to_code (Unit (Library_Unit (gnat_node)));
+ gnu_result = gnat_to_gnu (Unit (Library_Unit (gnat_node)));
break;
case N_Subunit:
- gnat_to_code (Proper_Body (gnat_node));
+ gnu_result = gnat_to_gnu (Proper_Body (gnat_node));
break;
/***************************/
/***************************/
case N_Handled_Sequence_Of_Statements:
-
- /* The GCC exception handling mechanism can handle both ZCX and SJLJ
- schemes and we have our own SJLJ mechanism. To call the GCC
- mechanism, we first call expand_eh_region_start if there is at least
- one handler associated with the region. We then generate code for
- the region and call expand_start_all_catch to announce that the
- associated handlers are going to be generated.
-
- For each handler we call expand_start_catch, generate code for the
- handler, and then call expand_end_catch.
-
- After all the handlers, we call expand_end_all_catch.
-
- Here we deal with the region level calls and the
- N_Exception_Handler branch deals with the handler level calls
- (start_catch/end_catch).
-
- ??? The region level calls down there have been specifically put in
- place for a ZCX context and currently the order in which things are
- emitted (region/handlers) is different from the SJLJ case. Instead of
- putting other calls with different conditions at other places for the
- SJLJ case, it seems cleaner to reorder things for the SJLJ case and
- generalize the condition to make it not ZCX specific. */
-
- /* If there is an At_End procedure attached to this node, and the eh
- mechanism is GNAT oriented (SJLJ or ZCX with front end tables), we
- must have at least a corresponding At_End handler, unless the
- No_Exception_Handlers restriction is set. */
- if (! type_annotate_only
- && Exception_Mechanism != GCC_ZCX
- && Present (At_End_Proc (gnat_node))
- && ! Present (Exception_Handlers (gnat_node))
- && ! No_Exception_Handlers_Set())
- gigi_abort (335);
-
- {
- /* Need a binding level that we can exit for this sequence if there is
- at least one exception handler for this block (since each handler
- needs an identified exit point) or there is an At_End procedure
- attached to this node (in order to have an attachment point for a
- GCC cleanup). */
- bool exitable_binding_for_block
- = (! type_annotate_only
- && (Present (Exception_Handlers (gnat_node))
- || Present (At_End_Proc (gnat_node))));
-
- /* Make a binding level that we can exit if we need one. */
- if (exitable_binding_for_block)
- {
- pushlevel (0);
- expand_start_bindings (1);
- }
-
- /* If we are to call a function when exiting this block, expand a GCC
- cleanup to take care. We have made a binding level for this cleanup
- above. */
- if (Present (At_End_Proc (gnat_node)))
- {
- tree gnu_cleanup_call
- = build_call_0_expr (gnat_to_gnu (At_End_Proc (gnat_node)));
-
- tree gnu_cleanup_decl
- = create_var_decl (get_identifier ("CLEANUP"), NULL_TREE,
- integer_type_node, NULL_TREE, 0, 0, 0, 0,
- 0);
-
- expand_decl_cleanup (gnu_cleanup_decl, gnu_cleanup_call);
- }
-
- /* Now we generate the code for this block, with a different layout
- for GNAT SJLJ and for GCC or front end ZCX. The handlers come first
- in the GNAT SJLJ case, while they come after the handled sequence
- in the other cases. */
-
- /* First deal with possible handlers for the GNAT SJLJ scheme. */
- if (! type_annotate_only
- && Exception_Mechanism == Setjmp_Longjmp
- && Present (Exception_Handlers (gnat_node)))
- {
- /* We already have a fresh binding level at hand. Declare a
- variable to save the old __gnat_jmpbuf value and a variable for
- our jmpbuf. Call setjmp and handle each of the possible
- exceptions if it returns one. */
-
- tree gnu_jmpsave_decl
- = create_var_decl (get_identifier ("JMPBUF_SAVE"), NULL_TREE,
- jmpbuf_ptr_type,
- build_call_0_expr (get_jmpbuf_decl),
- 0, 0, 0, 0, 0);
-
- tree gnu_jmpbuf_decl
- = create_var_decl (get_identifier ("JMP_BUF"),
- NULL_TREE, jmpbuf_type,
- NULL_TREE, 0, 0, 0, 0,
- 0);
-
- TREE_VALUE (gnu_block_stack) = gnu_jmpbuf_decl;
-
- /* When we exit this block, restore the saved value. */
- expand_decl_cleanup (gnu_jmpsave_decl,
- build_call_1_expr (set_jmpbuf_decl,
- gnu_jmpsave_decl));
-
- /* Call setjmp and handle exceptions if it returns one. */
- set_lineno (gnat_node, 1);
- expand_start_cond
- (build_call_1_expr (setjmp_decl,
- build_unary_op (ADDR_EXPR, NULL_TREE,
- gnu_jmpbuf_decl)),
- 0);
-
- /* Restore our incoming longjmp value before we do anything. */
- expand_expr_stmt
- (build_call_1_expr (set_jmpbuf_decl, gnu_jmpsave_decl));
-
- /* Make a binding level for the exception handling declarations
- and code. Don't assign it an exit label, since this is the
- outer block we want to exit at the end of each handler. */
- pushlevel (0);
- expand_start_bindings (0);
-
- gnu_except_ptr_stack
- = tree_cons (NULL_TREE,
- create_var_decl
- (get_identifier ("EXCEPT_PTR"), NULL_TREE,
- build_pointer_type (except_type_node),
- build_call_0_expr (get_excptr_decl),
- 0, 0, 0, 0, 0),
- gnu_except_ptr_stack);
-
- /* Generate code for each handler. The N_Exception_Handler case
- below does the real work. We ignore the dummy exception handler
- for the identifier case, as this is used only by the front
- end. */
- for (gnat_temp = First_Non_Pragma (Exception_Handlers (gnat_node));
- Present (gnat_temp);
- gnat_temp = Next_Non_Pragma (gnat_temp))
- gnat_to_code (gnat_temp);
-
- /* If none of the exception handlers did anything, re-raise
- but do not defer abortion. */
- set_lineno (gnat_node, 1);
- expand_expr_stmt
- (build_call_1_expr (raise_nodefer_decl,
- TREE_VALUE (gnu_except_ptr_stack)));
-
- gnu_except_ptr_stack = TREE_CHAIN (gnu_except_ptr_stack);
-
- /* End the binding level dedicated to the exception handlers. */
- expand_end_bindings (getdecls (), kept_level_p (), -1);
- poplevel (kept_level_p (), 1, 0);
-
- /* End the "if" on setjmp. Note that we have arranged things so
- control never returns here. */
- expand_end_cond ();
-
- /* This is now immediately before the body proper. Set our jmp_buf
- as the current buffer. */
- expand_expr_stmt
- (build_call_1_expr (set_jmpbuf_decl,
- build_unary_op (ADDR_EXPR, NULL_TREE,
- gnu_jmpbuf_decl)));
- }
-
- /* Now comes the processing for the sequence body. */
-
- /* If we use the back-end eh support, tell the back-end we are
- starting a new exception region. */
- if (! type_annotate_only
- && Exception_Mechanism == GCC_ZCX
- && Present (Exception_Handlers (gnat_node)))
- expand_eh_region_start ();
-
- /* Generate code and declarations for the prefix of this block,
- if any. */
- if (Present (First_Real_Statement (gnat_node)))
- process_decls (Statements (gnat_node), Empty,
- First_Real_Statement (gnat_node), 1, 1);
-
- /* Generate code for each statement in the block. */
- for (gnat_temp = (Present (First_Real_Statement (gnat_node))
- ? First_Real_Statement (gnat_node)
- : First (Statements (gnat_node)));
- Present (gnat_temp);
- gnat_temp = Next (gnat_temp))
- gnat_to_code (gnat_temp);
-
- /* Exit the binding level we made, if any. */
- if (exitable_binding_for_block)
- expand_exit_something ();
-
- /* Compile the handlers for front end ZCX or back-end supported
- exceptions. */
- if (! type_annotate_only
- && Exception_Mechanism != Setjmp_Longjmp
- && Present (Exception_Handlers (gnat_node)))
- {
- if (Exception_Mechanism == GCC_ZCX)
- expand_start_all_catch ();
-
- for (gnat_temp = First_Non_Pragma (Exception_Handlers (gnat_node));
- Present (gnat_temp);
- gnat_temp = Next_Non_Pragma (gnat_temp))
- gnat_to_code (gnat_temp);
-
- if (Exception_Mechanism == GCC_ZCX)
- expand_end_all_catch ();
- }
-
- /* Close the binding level we made, if any. */
- if (exitable_binding_for_block)
- {
- expand_end_bindings (getdecls (), kept_level_p (), -1);
- poplevel (kept_level_p (), 1, 0);
- }
- }
-
+ /* If there is an At_End procedure attached to this node, and the EH
+ mechanism is SJLJ, we must have at least a corresponding At_End
+ handler, unless the No_Exception_Handlers restriction is set. */
+ gcc_assert (type_annotate_only
+ || Exception_Mechanism != Setjmp_Longjmp
+ || No (At_End_Proc (gnat_node))
+ || Present (Exception_Handlers (gnat_node))
+ || No_Exception_Handlers_Set ());
+
+ gnu_result = Handled_Sequence_Of_Statements_to_gnu (gnat_node);
break;
case N_Exception_Handler:
if (Exception_Mechanism == Setjmp_Longjmp)
- {
- /* Unless this is "Others" or the special "Non-Ada" exception
- for Ada, make an "if" statement to select the proper
- exceptions. For "Others", exclude exceptions where
- Handled_By_Others is nonzero unless the All_Others flag is set.
- For "Non-ada", accept an exception if "Lang" is 'V'. */
- tree gnu_choice = integer_zero_node;
-
- for (gnat_temp = First (Exception_Choices (gnat_node));
- gnat_temp; gnat_temp = Next (gnat_temp))
- {
- tree this_choice;
-
- if (Nkind (gnat_temp) == N_Others_Choice)
- {
- if (All_Others (gnat_temp))
- this_choice = integer_one_node;
- else
- this_choice
- = build_binary_op
- (EQ_EXPR, integer_type_node,
- convert
- (integer_type_node,
- build_component_ref
- (build_unary_op
- (INDIRECT_REF, NULL_TREE,
- TREE_VALUE (gnu_except_ptr_stack)),
- get_identifier ("not_handled_by_others"), NULL_TREE,
- 0)),
- integer_zero_node);
- }
-
- else if (Nkind (gnat_temp) == N_Identifier
- || Nkind (gnat_temp) == N_Expanded_Name)
- {
- Entity_Id gnat_ex_id = Entity (gnat_temp);
-
- /* Exception may be a renaming. Recover original exception
- which is the one elaborated and registered. */
- if (Present (Renamed_Object (gnat_ex_id)))
- gnat_ex_id = Renamed_Object (gnat_ex_id);
-
- gnu_expr = gnat_to_gnu_entity (gnat_ex_id, NULL_TREE, 0);
-
- this_choice
- = build_binary_op
- (EQ_EXPR, integer_type_node,
- TREE_VALUE (gnu_except_ptr_stack),
- convert
- (TREE_TYPE (TREE_VALUE (gnu_except_ptr_stack)),
- build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr)));
-
- /* If this is the distinguished exception "Non_Ada_Error"
- (and we are in VMS mode), also allow a non-Ada
- exception (a VMS condition) to match. */
- if (Is_Non_Ada_Error (Entity (gnat_temp)))
- {
- tree gnu_comp
- = build_component_ref
- (build_unary_op
- (INDIRECT_REF, NULL_TREE,
- TREE_VALUE (gnu_except_ptr_stack)),
- get_identifier ("lang"), NULL_TREE, 0);
-
- this_choice
- = build_binary_op
- (TRUTH_ORIF_EXPR, integer_type_node,
- build_binary_op
- (EQ_EXPR, integer_type_node, gnu_comp,
- convert (TREE_TYPE (gnu_comp),
- build_int_2 ('V', 0))),
- this_choice);
- }
- }
- else
- gigi_abort (318);
-
- gnu_choice = build_binary_op (TRUTH_ORIF_EXPR, integer_type_node,
- gnu_choice, this_choice);
- }
-
- set_lineno (gnat_node, 1);
-
- expand_start_cond (gnu_choice, 0);
- }
+ gnu_result = Exception_Handler_to_gnu_sjlj (gnat_node);
+ else if (Exception_Mechanism == Back_End_Exceptions)
+ gnu_result = Exception_Handler_to_gnu_zcx (gnat_node);
+ else
+ gcc_unreachable ();
- /* Tell the back end that we start an exception handler if necessary. */
- if (Exception_Mechanism == GCC_ZCX)
- {
- /* We build a TREE_LIST of nodes representing what exception
- types this handler is able to catch, with special cases
- for others and all others cases.
-
- Each exception type is actually identified by a pointer to the
- exception id, with special value zero for "others" and one for
- "all others". Beware that these special values are known and used
- by the personality routine to identify the corresponding specific
- kinds of handlers.
-
- ??? For initial time frame reasons, the others and all_others
- cases have been handled using specific type trees, but this
- somehow hides information to the back-end, which expects NULL to
- be passed for catch all and end_cleanup to be used for cleanups.
-
- Care should be taken to ensure that the control flow impact of
- such clauses is rendered in some way. lang_eh_type_covers is
- doing the trick currently. */
-
- tree gnu_expr, gnu_etype;
- tree gnu_etypes_list = NULL_TREE;
-
- for (gnat_temp = First (Exception_Choices (gnat_node));
- gnat_temp; gnat_temp = Next (gnat_temp))
- {
- if (Nkind (gnat_temp) == N_Others_Choice)
- gnu_etype
- = All_Others (gnat_temp) ? integer_one_node
- : integer_zero_node;
- else if (Nkind (gnat_temp) == N_Identifier
- || Nkind (gnat_temp) == N_Expanded_Name)
- {
- Entity_Id gnat_ex_id = Entity (gnat_temp);
-
- /* Exception may be a renaming. Recover original exception
- which is the one elaborated and registered. */
- if (Present (Renamed_Object (gnat_ex_id)))
- gnat_ex_id = Renamed_Object (gnat_ex_id);
-
- gnu_expr = gnat_to_gnu_entity (gnat_ex_id, NULL_TREE, 0);
-
- gnu_etype
- = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_expr);
-
- /* The Non_Ada_Error case for VMS exceptions is handled
- by the personality routine. */
- }
- else
- gigi_abort (337);
-
- /* The GCC interface expects NULL to be passed for catch all
- handlers, so it would be quite tempting to set gnu_etypes_list
- to NULL if gnu_etype is integer_zero_node. It would not work,
- however, because GCC's notion of "catch all" is stronger than
- our notion of "others". Until we correctly use the cleanup
- interface as well, the doing tht would prevent the "all
- others" handlers from beeing seen, because nothing can be
- caught beyond a catch all from GCC's point of view. */
- gnu_etypes_list
- = tree_cons (NULL_TREE, gnu_etype, gnu_etypes_list);
-
- }
-
- expand_start_catch (gnu_etypes_list);
-
- pushlevel (0);
- expand_start_bindings (0);
+ break;
- {
- /* Expand a call to the begin_handler hook at the beginning of the
- handler, and arrange for a call to the end_handler hook to
- occur on every possible exit path.
-
- The hooks expect a pointer to the low level occurrence. This
- is required for our stack management scheme because a raise
- inside the handler pushes a new occurrence on top of the
- stack, which means that this top does not necessarily match
- the occurrence this handler was dealing with.
-
- The EXC_PTR_EXPR object references the exception occurrence
- beeing propagated. Upon handler entry, this is the exception
- for which the handler is triggered. This might not be the case
- upon handler exit, however, as we might have a new occurrence
- propagated by the handler's body, and the end_handler hook
- called as a cleanup in this context.
-
- We use a local variable to retrieve the incoming value at
- handler entry time, and reuse it to feed the end_handler
- hook's argument at exit time. */
- tree gnu_current_exc_ptr
- = build (EXC_PTR_EXPR, ptr_type_node);
- tree gnu_incoming_exc_ptr
- = create_var_decl (get_identifier ("EXPTR"), NULL_TREE,
- ptr_type_node, gnu_current_exc_ptr,
- 0, 0, 0, 0, 0);
-
- expand_expr_stmt
- (build_call_1_expr (begin_handler_decl, gnu_incoming_exc_ptr));
- expand_decl_cleanup
- (0, build_call_1_expr (end_handler_decl, gnu_incoming_exc_ptr));
- }
- }
+ case N_Push_Constraint_Error_Label:
+ push_exception_label_stack (&gnu_constraint_error_label_stack,
+ Exception_Label (gnat_node));
+ break;
- for (gnat_temp = First (Statements (gnat_node));
- gnat_temp; gnat_temp = Next (gnat_temp))
- gnat_to_code (gnat_temp);
+ case N_Push_Storage_Error_Label:
+ push_exception_label_stack (&gnu_storage_error_label_stack,
+ Exception_Label (gnat_node));
+ break;
- if (Exception_Mechanism == GCC_ZCX)
- {
- /* Tell the back end that we're done with the current handler. */
- expand_end_bindings (getdecls (), kept_level_p (), -1);
- poplevel (kept_level_p (), 1, 0);
+ case N_Push_Program_Error_Label:
+ push_exception_label_stack (&gnu_program_error_label_stack,
+ Exception_Label (gnat_node));
+ break;
- expand_end_catch ();
- }
- else
- /* At the end of the handler, exit the block. We made this block in
- N_Handled_Sequence_Of_Statements. */
- expand_exit_something ();
+ case N_Pop_Constraint_Error_Label:
+ gnu_constraint_error_label_stack
+ = TREE_CHAIN (gnu_constraint_error_label_stack);
+ break;
- if (Exception_Mechanism == Setjmp_Longjmp)
- expand_end_cond ();
+ case N_Pop_Storage_Error_Label:
+ gnu_storage_error_label_stack
+ = TREE_CHAIN (gnu_storage_error_label_stack);
+ break;
+ case N_Pop_Program_Error_Label:
+ gnu_program_error_label_stack
+ = TREE_CHAIN (gnu_program_error_label_stack);
break;
/*******************************/
case N_Function_Instantiation:
/* These nodes can appear on a declaration list but there is nothing to
to be done with them. */
+ gnu_result = alloc_stmt_list ();
break;
/***************************************************/
case N_Attribute_Definition_Clause:
+ gnu_result = alloc_stmt_list ();
+
/* The only one we need deal with is for 'Address. For the others, SEM
puts the information elsewhere. We need only deal with 'Address
if the object has a Freeze_Node (which it never will currently). */
/* Get the value to use as the address and save it as the
equivalent for GNAT_TEMP. When the object is frozen,
gnat_to_gnu_entity will do the right thing. */
- gnu_expr = gnat_to_gnu (Expression (gnat_node));
- save_gnu_tree (Entity (Name (gnat_node)), gnu_expr, 1);
+ save_gnu_tree (Entity (Name (gnat_node)),
+ gnat_to_gnu (Expression (gnat_node)), true);
break;
case N_Enumeration_Representation_Clause:
case N_Record_Representation_Clause:
case N_At_Clause:
/* We do nothing with these. SEM puts the information elsewhere. */
+ gnu_result = alloc_stmt_list ();
break;
case N_Code_Statement:
- if (! type_annotate_only)
+ if (!type_annotate_only)
{
tree gnu_template = gnat_to_gnu (Asm_Template (gnat_node));
- tree gnu_input_list = 0, gnu_output_list = 0, gnu_orig_out_list = 0;
- tree gnu_clobber_list = 0;
+ tree gnu_inputs = NULL_TREE, gnu_outputs = NULL_TREE;
+ tree gnu_clobbers = NULL_TREE, tail;
+ bool allows_mem, allows_reg, fake;
+ int ninputs, noutputs, i;
+ const char **oconstraints;
+ const char *constraint;
char *clobber;
- /* First process inputs, then outputs, then clobbers. */
- Setup_Asm_Inputs (gnat_node);
- while (Present (gnat_temp = Asm_Input_Value ()))
+ /* First retrieve the 3 operand lists built by the front-end. */
+ Setup_Asm_Outputs (gnat_node);
+ while (Present (gnat_temp = Asm_Output_Variable ()))
{
tree gnu_value = gnat_to_gnu (gnat_temp);
tree gnu_constr = build_tree_list (NULL_TREE, gnat_to_gnu
- (Asm_Input_Constraint ()));
+ (Asm_Output_Constraint ()));
- gnu_input_list
- = tree_cons (gnu_constr, gnu_value, gnu_input_list);
- Next_Asm_Input ();
+ gnu_outputs = tree_cons (gnu_constr, gnu_value, gnu_outputs);
+ Next_Asm_Output ();
}
- Setup_Asm_Outputs (gnat_node);
- while (Present (gnat_temp = Asm_Output_Variable ()))
+ Setup_Asm_Inputs (gnat_node);
+ while (Present (gnat_temp = Asm_Input_Value ()))
{
tree gnu_value = gnat_to_gnu (gnat_temp);
tree gnu_constr = build_tree_list (NULL_TREE, gnat_to_gnu
- (Asm_Output_Constraint ()));
+ (Asm_Input_Constraint ()));
- gnu_orig_out_list
- = tree_cons (gnu_constr, gnu_value, gnu_orig_out_list);
- gnu_output_list
- = tree_cons (gnu_constr, gnu_value, gnu_output_list);
- Next_Asm_Output ();
+ gnu_inputs = tree_cons (gnu_constr, gnu_value, gnu_inputs);
+ Next_Asm_Input ();
}
Clobber_Setup (gnat_node);
- while ((clobber = Clobber_Get_Next ()) != 0)
- gnu_clobber_list
+ while ((clobber = Clobber_Get_Next ()))
+ gnu_clobbers
= tree_cons (NULL_TREE,
build_string (strlen (clobber) + 1, clobber),
- gnu_clobber_list);
-
- gnu_input_list = nreverse (gnu_input_list);
- gnu_output_list = nreverse (gnu_output_list);
- gnu_orig_out_list = nreverse (gnu_orig_out_list);
- gnu_result = build_nt (ASM_STMT, gnu_template, gnu_output_list,
- gnu_orig_out_list, gnu_input_list,
- gnu_clobber_list);
- TREE_THIS_VOLATILE (gnu_result) = Is_Asm_Volatile (gnat_node);
+ gnu_clobbers);
+
+ /* Then perform some standard checking and processing on the
+ operands. In particular, mark them addressable if needed. */
+ gnu_outputs = nreverse (gnu_outputs);
+ noutputs = list_length (gnu_outputs);
+ gnu_inputs = nreverse (gnu_inputs);
+ ninputs = list_length (gnu_inputs);
+ oconstraints
+ = (const char **) alloca (noutputs * sizeof (const char *));
+
+ for (i = 0, tail = gnu_outputs; tail; ++i, tail = TREE_CHAIN (tail))
+ {
+ tree output = TREE_VALUE (tail);
+ constraint
+ = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (tail)));
+ oconstraints[i] = constraint;
+
+ if (parse_output_constraint (&constraint, i, ninputs, noutputs,
+ &allows_mem, &allows_reg, &fake))
+ {
+ /* If the operand is going to end up in memory,
+ mark it addressable. Note that we don't test
+ allows_mem like in the input case below; this
+ is modelled on the C front-end. */
+ if (!allows_reg
+ && !gnat_mark_addressable (output))
+ output = error_mark_node;
+ }
+ else
+ output = error_mark_node;
+
+ TREE_VALUE (tail) = output;
+ }
+
+ for (i = 0, tail = gnu_inputs; tail; ++i, tail = TREE_CHAIN (tail))
+ {
+ tree input = TREE_VALUE (tail);
+ constraint
+ = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (tail)));
+
+ if (parse_input_constraint (&constraint, i, ninputs, noutputs,
+ 0, oconstraints,
+ &allows_mem, &allows_reg))
+ {
+ /* If the operand is going to end up in memory,
+ mark it addressable. */
+ if (!allows_reg && allows_mem
+ && !gnat_mark_addressable (input))
+ input = error_mark_node;
+ }
+ else
+ input = error_mark_node;
+
+ TREE_VALUE (tail) = input;
+ }
+
+ gnu_result = build4 (ASM_EXPR, void_type_node,
+ gnu_template, gnu_outputs,
+ gnu_inputs, gnu_clobbers);
+ ASM_VOLATILE_P (gnu_result) = Is_Asm_Volatile (gnat_node);
}
+ else
+ gnu_result = alloc_stmt_list ();
+
break;
/***************************************************/
/***************************************************/
case N_Freeze_Entity:
+ start_stmt_group ();
process_freeze_entity (gnat_node);
- process_decls (Actions (gnat_node), Empty, Empty, 1, 1);
+ process_decls (Actions (gnat_node), Empty, Empty, true, true);
+ gnu_result = end_stmt_group ();
break;
case N_Itype_Reference:
- if (! present_gnu_tree (Itype (gnat_node)))
+ if (!present_gnu_tree (Itype (gnat_node)))
process_type (Itype (gnat_node));
+
+ gnu_result = alloc_stmt_list ();
break;
case N_Free_Statement:
- if (! type_annotate_only)
+ if (!type_annotate_only)
{
tree gnu_ptr = gnat_to_gnu (Expression (gnat_node));
+ tree gnu_ptr_type = TREE_TYPE (gnu_ptr);
tree gnu_obj_type;
+ tree gnu_actual_obj_type = 0;
tree gnu_obj_size;
int align;
gnu_ptr);
gnu_obj_type = TREE_TYPE (TREE_TYPE (gnu_ptr));
- gnu_obj_size = TYPE_SIZE_UNIT (gnu_obj_type);
+
+ if (Present (Actual_Designated_Subtype (gnat_node)))
+ {
+ gnu_actual_obj_type
+ = gnat_to_gnu_type (Actual_Designated_Subtype (gnat_node));
+
+ if (TYPE_FAT_OR_THIN_POINTER_P (gnu_ptr_type))
+ gnu_actual_obj_type
+ = build_unc_object_type_from_ptr (gnu_ptr_type,
+ gnu_actual_obj_type,
+ get_identifier ("DEALLOC"));
+ }
+ else
+ gnu_actual_obj_type = gnu_obj_type;
+
+ gnu_obj_size = TYPE_SIZE_UNIT (gnu_actual_obj_type);
align = TYPE_ALIGN (gnu_obj_type);
if (TREE_CODE (gnu_obj_type) == RECORD_TYPE
tree gnu_char_ptr_type = build_pointer_type (char_type_node);
tree gnu_pos = byte_position (TYPE_FIELDS (gnu_obj_type));
tree gnu_byte_offset
- = convert (gnu_char_ptr_type,
+ = convert (sizetype,
size_diffop (size_zero_node, gnu_pos));
+ gnu_byte_offset = fold_build1 (NEGATE_EXPR, sizetype, gnu_byte_offset);
gnu_ptr = convert (gnu_char_ptr_type, gnu_ptr);
- gnu_ptr = build_binary_op (MINUS_EXPR, gnu_char_ptr_type,
+ gnu_ptr = build_binary_op (POINTER_PLUS_EXPR, gnu_char_ptr_type,
gnu_ptr, gnu_byte_offset);
}
- gnu_result
- = build_nt (EXPR_STMT,
- build_call_alloc_dealloc
- (gnu_ptr, gnu_obj_size, align,
- Procedure_To_Call (gnat_node),
- Storage_Pool (gnat_node), gnat_node));
+ gnu_result = build_call_alloc_dealloc (gnu_ptr, gnu_obj_size, align,
+ Procedure_To_Call (gnat_node),
+ Storage_Pool (gnat_node),
+ gnat_node);
}
break;
case N_Raise_Constraint_Error:
case N_Raise_Program_Error:
case N_Raise_Storage_Error:
-
if (type_annotate_only)
- break;
+ {
+ gnu_result = alloc_stmt_list ();
+ break;
+ }
gnu_result_type = get_unpadded_type (Etype (gnat_node));
- gnu_result = build_call_raise (UI_To_Int (Reason (gnat_node)));
+ gnu_result
+ = build_call_raise (UI_To_Int (Reason (gnat_node)), gnat_node,
+ Nkind (gnat_node));
/* If the type is VOID, this is a statement, so we need to
generate the code for the call. Handle a Condition, if there
is one. */
if (TREE_CODE (gnu_result_type) == VOID_TYPE)
{
- gnu_result = build_nt (EXPR_STMT, gnu_result);
- TREE_TYPE (gnu_result) = void_type_node;
- TREE_SLOC (gnu_result) = Sloc (gnat_node);
+ annotate_with_node (gnu_result, gnat_node);
if (Present (Condition (gnat_node)))
- gnu_result = build_nt (IF_STMT,
- gnat_to_gnu (Condition (gnat_node)),
- gnu_result, NULL_TREE, NULL_TREE);
+ gnu_result = build3 (COND_EXPR, void_type_node,
+ gnat_to_gnu (Condition (gnat_node)),
+ gnu_result, alloc_stmt_list ());
}
else
gnu_result = build1 (NULL_EXPR, gnu_result_type, gnu_result);
/* If the result is a pointer type, see if we are either converting
from a non-pointer or from a pointer to a type with a different
alias set and warn if so. If the result defined in the same unit as
- this unchecked convertion, we can allow this because we can know to
+ this unchecked conversion, we can allow this because we can know to
make that type have alias set 0. */
{
tree gnu_source_type = gnat_to_gnu_type (Source_Type (gnat_node));
("\\?or use `pragma No_Strict_Aliasing (&);`",
gnat_node, Target_Type (gnat_node));
}
+
+ /* The No_Strict_Aliasing flag is not propagated to the back-end for
+ fat pointers so unconditionally warn in problematic cases. */
+ else if (TYPE_FAT_POINTER_P (gnu_target_type))
+ {
+ tree array_type
+ = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (gnu_target_type)));
+
+ if (get_alias_set (array_type) != 0
+ && (!TYPE_FAT_POINTER_P (gnu_source_type)
+ || (get_alias_set (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (gnu_source_type))))
+ != get_alias_set (array_type))))
+ {
+ post_error_ne
+ ("?possible aliasing problem for type&",
+ gnat_node, Target_Type (gnat_node));
+ post_error
+ ("\\?use -fno-strict-aliasing switch for references",
+ gnat_node);
+ }
+ }
}
+ gnu_result = alloc_stmt_list ();
break;
case N_Raise_Statement:
case N_Component_Association:
case N_Task_Body:
default:
- if (! type_annotate_only)
- gigi_abort (321);
+ gcc_assert (type_annotate_only);
+ gnu_result = alloc_stmt_list ();
}
- /* If the result is a statement, set needed flags and return it. */
- if (IS_STMT (gnu_result))
+ /* If we pushed our level as part of processing the elaboration routine,
+ pop it back now. */
+ if (went_into_elab_proc)
{
- TREE_TYPE (gnu_result) = void_type_node;
- TREE_THIS_VOLATILE (gnu_result) = TREE_SIDE_EFFECTS (gnu_result) = 1;
- TREE_SLOC (gnu_result) = Sloc (gnat_node);
- return gnu_result;
+ add_stmt (gnu_result);
+ gnat_poplevel ();
+ gnu_result = end_stmt_group ();
+ current_function_decl = NULL_TREE;
}
+ /* Set the location information on the result if it is a real expression.
+ References can be reused for multiple GNAT nodes and they would get
+ the location information of their last use. Note that we may have
+ no result if we tried to build a CALL_EXPR node to a procedure with
+ no side-effects and optimization is enabled. */
+ if (gnu_result && EXPR_P (gnu_result) && !REFERENCE_CLASS_P (gnu_result))
+ annotate_with_node (gnu_result, gnat_node);
+
+ /* If we're supposed to return something of void_type, it means we have
+ something we're elaborating for effect, so just return. */
+ if (TREE_CODE (gnu_result_type) == VOID_TYPE)
+ return gnu_result;
+
/* If the result is a constant that overflows, raise constraint error. */
else if (TREE_CODE (gnu_result) == INTEGER_CST
- && TREE_CONSTANT_OVERFLOW (gnu_result))
+ && TREE_OVERFLOW (gnu_result))
{
post_error ("Constraint_Error will be raised at run-time?", gnat_node);
gnu_result
= build1 (NULL_EXPR, gnu_result_type,
- build_call_raise (CE_Overflow_Check_Failed));
+ build_call_raise (CE_Overflow_Check_Failed, gnat_node,
+ N_Raise_Constraint_Error));
}
/* If our result has side-effects and is of an unconstrained type,
if (TREE_SIDE_EFFECTS (gnu_result)
&& (TREE_CODE (gnu_result_type) == UNCONSTRAINED_ARRAY_TYPE
|| CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_result_type))))
- gnu_result = gnat_stabilize_reference (gnu_result, 0);
+ gnu_result = gnat_stabilize_reference (gnu_result, false);
/* Now convert the result to the proper type. If the type is void or if
we have no result, return error_mark_node to show we have no result.
|| (Nkind (Parent (gnat_node)) == N_Procedure_Call_Statement
&& Name (Parent (gnat_node)) != gnat_node)
|| (Nkind (Parent (gnat_node)) == N_Unchecked_Type_Conversion
- && ! AGGREGATE_TYPE_P (gnu_result_type)
- && ! AGGREGATE_TYPE_P (TREE_TYPE (gnu_result)))
+ && !AGGREGATE_TYPE_P (gnu_result_type)
+ && !AGGREGATE_TYPE_P (TREE_TYPE (gnu_result)))
|| Nkind (Parent (gnat_node)) == N_Parameter_Association)
- && ! (TYPE_SIZE (gnu_result_type) != 0
- && TYPE_SIZE (TREE_TYPE (gnu_result)) != 0
- && (AGGREGATE_TYPE_P (gnu_result_type)
- == AGGREGATE_TYPE_P (TREE_TYPE (gnu_result)))
- && ((TREE_CODE (TYPE_SIZE (gnu_result_type)) == INTEGER_CST
- && (TREE_CODE (TYPE_SIZE (TREE_TYPE (gnu_result)))
- != INTEGER_CST))
- || (TREE_CODE (TYPE_SIZE (gnu_result_type)) != INTEGER_CST
- && ! CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_result_type))
- && (CONTAINS_PLACEHOLDER_P
- (TYPE_SIZE (TREE_TYPE (gnu_result))))))
- && ! (TREE_CODE (gnu_result_type) == RECORD_TYPE
- && TYPE_LEFT_JUSTIFIED_MODULAR_P (gnu_result_type))))
+ && !(TYPE_SIZE (gnu_result_type)
+ && TYPE_SIZE (TREE_TYPE (gnu_result))
+ && (AGGREGATE_TYPE_P (gnu_result_type)
+ == AGGREGATE_TYPE_P (TREE_TYPE (gnu_result)))
+ && ((TREE_CODE (TYPE_SIZE (gnu_result_type)) == INTEGER_CST
+ && (TREE_CODE (TYPE_SIZE (TREE_TYPE (gnu_result)))
+ != INTEGER_CST))
+ || (TREE_CODE (TYPE_SIZE (gnu_result_type)) != INTEGER_CST
+ && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_result_type))
+ && (CONTAINS_PLACEHOLDER_P
+ (TYPE_SIZE (TREE_TYPE (gnu_result))))))
+ && !(TREE_CODE (gnu_result_type) == RECORD_TYPE
+ && TYPE_JUSTIFIED_MODULAR_P (gnu_result_type))))
{
/* In this case remove padding only if the inner object is of
self-referential size: in that case it must be an object of
else if (TREE_CODE (gnu_result) == LABEL_DECL
|| TREE_CODE (gnu_result) == FIELD_DECL
|| TREE_CODE (gnu_result) == ERROR_MARK
- || (TYPE_SIZE (gnu_result_type) != 0
+ || (TYPE_SIZE (gnu_result_type)
&& TREE_CODE (TYPE_SIZE (gnu_result_type)) != INTEGER_CST
&& TREE_CODE (gnu_result) != INDIRECT_REF
&& CONTAINS_PLACEHOLDER_P (TYPE_SIZE (gnu_result_type)))
return gnu_result;
}
\f
-/* INSN is a list of insns. Return the first rtl in the list that isn't
- an INSN_NOTE_DELETED. */
+/* Subroutine of above to push the exception label stack. GNU_STACK is
+ a pointer to the stack to update and GNAT_LABEL, if present, is the
+ label to push onto the stack. */
-static rtx
-first_nondeleted_insn (rtx insns)
+static void
+push_exception_label_stack (tree *gnu_stack, Entity_Id gnat_label)
{
- for (; insns && GET_CODE (insns) == NOTE
- && NOTE_LINE_NUMBER (insns) == NOTE_INSN_DELETED;
- insns = NEXT_INSN (insns))
- ;
+ tree gnu_label = (Present (gnat_label)
+ ? gnat_to_gnu_entity (gnat_label, NULL_TREE, 0)
+ : NULL_TREE);
+
+ *gnu_stack = tree_cons (NULL_TREE, gnu_label, *gnu_stack);
+}
+\f
+/* Record the current code position in GNAT_NODE. */
+
+static void
+record_code_position (Node_Id gnat_node)
+{
+ tree stmt_stmt = build1 (STMT_STMT, void_type_node, NULL_TREE);
+
+ add_stmt_with_node (stmt_stmt, gnat_node);
+ save_gnu_tree (gnat_node, stmt_stmt, true);
+}
+
+/* Insert the code for GNAT_NODE at the position saved for that node. */
- return insns;
+static void
+insert_code_for (Node_Id gnat_node)
+{
+ STMT_STMT_STMT (get_gnu_tree (gnat_node)) = gnat_to_gnu (gnat_node);
+ save_gnu_tree (gnat_node, NULL_TREE, true);
}
\f
-/* Build a BLOCK_STMT from GNAT_LIST, a possibly-empty list of statements. */
+/* Start a new statement group chained to the previous group. */
+
+void
+start_stmt_group (void)
+{
+ struct stmt_group *group = stmt_group_free_list;
+
+ /* First see if we can get one from the free list. */
+ if (group)
+ stmt_group_free_list = group->previous;
+ else
+ group = (struct stmt_group *) ggc_alloc (sizeof (struct stmt_group));
+
+ group->previous = current_stmt_group;
+ group->stmt_list = group->block = group->cleanups = NULL_TREE;
+ current_stmt_group = group;
+}
+
+/* Add GNU_STMT to the current statement group. */
+
+void
+add_stmt (tree gnu_stmt)
+{
+ append_to_statement_list (gnu_stmt, ¤t_stmt_group->stmt_list);
+}
+
+/* Similar, but set the location of GNU_STMT to that of GNAT_NODE. */
+
+void
+add_stmt_with_node (tree gnu_stmt, Node_Id gnat_node)
+{
+ if (Present (gnat_node))
+ annotate_with_node (gnu_stmt, gnat_node);
+ add_stmt (gnu_stmt);
+}
+
+/* Add a declaration statement for GNU_DECL to the current statement group.
+ Get SLOC from Entity_Id. */
+
+void
+add_decl_expr (tree gnu_decl, Entity_Id gnat_entity)
+{
+ tree type = TREE_TYPE (gnu_decl);
+ tree gnu_stmt, gnu_init, gnu_lhs;
+
+ /* If this is a variable that Gigi is to ignore, we may have been given
+ an ERROR_MARK. So test for it. We also might have been given a
+ reference for a renaming. So only do something for a decl. Also
+ ignore a TYPE_DECL for an UNCONSTRAINED_ARRAY_TYPE. */
+ if (!DECL_P (gnu_decl)
+ || (TREE_CODE (gnu_decl) == TYPE_DECL
+ && TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE))
+ return;
+
+ gnu_stmt = build1 (DECL_EXPR, void_type_node, gnu_decl);
+
+ /* If we are global, we don't want to actually output the DECL_EXPR for
+ this decl since we already have evaluated the expressions in the
+ sizes and positions as globals and doing it again would be wrong. */
+ if (global_bindings_p ())
+ {
+ /* Mark everything as used to prevent node sharing with subprograms.
+ Note that walk_tree knows how to handle TYPE_DECL, but neither
+ VAR_DECL nor CONST_DECL. This appears to be somewhat arbitrary. */
+ walk_tree (&gnu_stmt, mark_visited, NULL, NULL);
+ if (TREE_CODE (gnu_decl) == VAR_DECL
+ || TREE_CODE (gnu_decl) == CONST_DECL)
+ {
+ walk_tree (&DECL_SIZE (gnu_decl), mark_visited, NULL, NULL);
+ walk_tree (&DECL_SIZE_UNIT (gnu_decl), mark_visited, NULL, NULL);
+ walk_tree (&DECL_INITIAL (gnu_decl), mark_visited, NULL, NULL);
+ }
+ }
+ else
+ add_stmt_with_node (gnu_stmt, gnat_entity);
+
+ /* If this is a variable and an initializer is attached to it, it must be
+ valid for the context. Similar to init_const in create_var_decl_1. */
+ if (TREE_CODE (gnu_decl) == VAR_DECL
+ && (gnu_init = DECL_INITIAL (gnu_decl)) != NULL_TREE
+ && (TYPE_MAIN_VARIANT (type) != TYPE_MAIN_VARIANT (TREE_TYPE (gnu_init))
+ || (TREE_STATIC (gnu_decl)
+ && !initializer_constant_valid_p (gnu_init,
+ TREE_TYPE (gnu_init)))))
+ {
+ /* If GNU_DECL has a padded type, convert it to the unpadded
+ type so the assignment is done properly. */
+ if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
+ gnu_lhs = convert (TREE_TYPE (TYPE_FIELDS (type)), gnu_decl);
+ else
+ gnu_lhs = gnu_decl;
+
+ gnu_stmt = build_binary_op (MODIFY_EXPR, NULL_TREE, gnu_lhs, gnu_init);
+
+ DECL_INITIAL (gnu_decl) = NULL_TREE;
+ if (TREE_READONLY (gnu_decl))
+ {
+ TREE_READONLY (gnu_decl) = 0;
+ DECL_READONLY_ONCE_ELAB (gnu_decl) = 1;
+ }
+
+ add_stmt_with_node (gnu_stmt, gnat_entity);
+ }
+}
+
+/* Utility function to mark nodes with TREE_VISITED and types as having their
+ sized gimplified. Called from walk_tree. We use this to indicate all
+ variable sizes and positions in global types may not be shared by any
+ subprogram. */
static tree
-build_block_stmt (List_Id gnat_list)
+mark_visited (tree *tp, int *walk_subtrees, void *data ATTRIBUTE_UNUSED)
{
- tree gnu_result = NULL_TREE;
- Node_Id gnat_node;
+ if (TREE_VISITED (*tp))
+ *walk_subtrees = 0;
- if (No (gnat_list) || Is_Empty_List (gnat_list))
- return NULL_TREE;
+ /* Don't mark a dummy type as visited because we want to mark its sizes
+ and fields once it's filled in. */
+ else if (!TYPE_IS_DUMMY_P (*tp))
+ TREE_VISITED (*tp) = 1;
- for (gnat_node = First (gnat_list);
- Present (gnat_node);
- gnat_node = Next (gnat_node))
- gnu_result = chainon (gnat_to_gnu (gnat_node), gnu_result);
+ if (TYPE_P (*tp))
+ TYPE_SIZES_GIMPLIFIED (*tp) = 1;
- gnu_result = build_nt (BLOCK_STMT, nreverse (gnu_result));
- TREE_SLOC (gnu_result) = TREE_SLOC (BLOCK_STMT_LIST (gnu_result));
- TREE_TYPE (gnu_result) = void_type_node;
- return gnu_result;
-}
+ return NULL_TREE;
+}
-/* Build an EXPR_STMT to evaluate INSNS. Use Sloc from GNAT_NODE. */
+/* Utility function to unshare expressions wrapped up in a SAVE_EXPR. */
static tree
-make_expr_stmt_from_rtl (rtx insns, Node_Id gnat_node)
+unshare_save_expr (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
+ void *data ATTRIBUTE_UNUSED)
{
- tree gnu_result = make_node (RTL_EXPR);
+ tree t = *tp;
+
+ if (TREE_CODE (t) == SAVE_EXPR)
+ TREE_OPERAND (t, 0) = unshare_expr (TREE_OPERAND (t, 0));
- TREE_TYPE (gnu_result) = void_type_node;
- RTL_EXPR_RTL (gnu_result) = RTL_EXPR_ALT_RTL (gnu_result) = const0_rtx;
- RTL_EXPR_SEQUENCE (gnu_result) = insns;
- rtl_expr_chain = tree_cons (NULL_TREE, gnu_result, rtl_expr_chain);
+ return NULL_TREE;
+}
- gnu_result = build_nt (EXPR_STMT, gnu_result);
- TREE_SLOC (gnu_result) = Sloc (gnat_node);
- TREE_TYPE (gnu_result) = void_type_node;
+/* Add GNU_CLEANUP, a cleanup action, to the current code group and
+ set its location to that of GNAT_NODE if present. */
- return gnu_result;
+static void
+add_cleanup (tree gnu_cleanup, Node_Id gnat_node)
+{
+ if (Present (gnat_node))
+ annotate_with_node (gnu_cleanup, gnat_node);
+ append_to_statement_list (gnu_cleanup, ¤t_stmt_group->cleanups);
}
-\f
-/* GNU_STMT is a statement. We generate code for that statement. */
+
+/* Set the BLOCK node corresponding to the current code group to GNU_BLOCK. */
void
-gnat_expand_stmt (tree gnu_stmt)
+set_block_for_group (tree gnu_block)
+{
+ gcc_assert (!current_stmt_group->block);
+ current_stmt_group->block = gnu_block;
+}
+
+/* Return code corresponding to the current code group. It is normally
+ a STATEMENT_LIST, but may also be a BIND_EXPR or TRY_FINALLY_EXPR if
+ BLOCK or cleanups were set. */
+
+tree
+end_stmt_group (void)
+{
+ struct stmt_group *group = current_stmt_group;
+ tree gnu_retval = group->stmt_list;
+
+ /* If this is a null list, allocate a new STATEMENT_LIST. Then, if there
+ are cleanups, make a TRY_FINALLY_EXPR. Last, if there is a BLOCK,
+ make a BIND_EXPR. Note that we nest in that because the cleanup may
+ reference variables in the block. */
+ if (gnu_retval == NULL_TREE)
+ gnu_retval = alloc_stmt_list ();
+
+ if (group->cleanups)
+ gnu_retval = build2 (TRY_FINALLY_EXPR, void_type_node, gnu_retval,
+ group->cleanups);
+
+ if (current_stmt_group->block)
+ gnu_retval = build3 (BIND_EXPR, void_type_node, BLOCK_VARS (group->block),
+ gnu_retval, group->block);
+
+ /* Remove this group from the stack and add it to the free list. */
+ current_stmt_group = group->previous;
+ group->previous = stmt_group_free_list;
+ stmt_group_free_list = group;
+
+ return gnu_retval;
+}
+
+/* Add a list of statements from GNAT_LIST, a possibly-empty list of
+ statements.*/
+
+static void
+add_stmt_list (List_Id gnat_list)
+{
+ Node_Id gnat_node;
+
+ if (Present (gnat_list))
+ for (gnat_node = First (gnat_list); Present (gnat_node);
+ gnat_node = Next (gnat_node))
+ add_stmt (gnat_to_gnu (gnat_node));
+}
+
+/* Build a tree from GNAT_LIST, a possibly-empty list of statements.
+ If BINDING_P is true, push and pop a binding level around the list. */
+
+static tree
+build_stmt_group (List_Id gnat_list, bool binding_p)
{
- tree gnu_elmt, gnu_elmt_2;
+ start_stmt_group ();
+ if (binding_p)
+ gnat_pushlevel ();
+
+ add_stmt_list (gnat_list);
+ if (binding_p)
+ gnat_poplevel ();
+
+ return end_stmt_group ();
+}
+\f
+/* Push and pop routines for stacks. We keep a free list around so we
+ don't waste tree nodes. */
- if (TREE_SLOC (gnu_stmt))
- set_lineno_from_sloc (TREE_SLOC (gnu_stmt), 1);
+static void
+push_stack (tree *gnu_stack_ptr, tree gnu_purpose, tree gnu_value)
+{
+ tree gnu_node = gnu_stack_free_list;
- switch (TREE_CODE (gnu_stmt))
+ if (gnu_node)
{
- case EXPR_STMT:
- expand_expr_stmt (EXPR_STMT_EXPR (gnu_stmt));
- break;
+ gnu_stack_free_list = TREE_CHAIN (gnu_node);
+ TREE_CHAIN (gnu_node) = *gnu_stack_ptr;
+ TREE_PURPOSE (gnu_node) = gnu_purpose;
+ TREE_VALUE (gnu_node) = gnu_value;
+ }
+ else
+ gnu_node = tree_cons (gnu_purpose, gnu_value, *gnu_stack_ptr);
- case BLOCK_STMT:
- for (gnu_elmt = BLOCK_STMT_LIST (gnu_stmt); gnu_elmt;
- gnu_elmt = TREE_CHAIN (gnu_elmt))
- expand_expr_stmt (gnu_elmt);
- break;
+ *gnu_stack_ptr = gnu_node;
+}
- case IF_STMT:
- expand_start_cond (IF_STMT_COND (gnu_stmt), 0);
+static void
+pop_stack (tree *gnu_stack_ptr)
+{
+ tree gnu_node = *gnu_stack_ptr;
+
+ *gnu_stack_ptr = TREE_CHAIN (gnu_node);
+ TREE_CHAIN (gnu_node) = gnu_stack_free_list;
+ gnu_stack_free_list = gnu_node;
+}
+\f
+/* Generate GIMPLE in place for the expression at *EXPR_P. */
+
+int
+gnat_gimplify_expr (tree *expr_p, tree *pre_p, tree *post_p ATTRIBUTE_UNUSED)
+{
+ tree expr = *expr_p;
+ tree op;
+
+ if (IS_ADA_STMT (expr))
+ return gnat_gimplify_stmt (expr_p);
+
+ switch (TREE_CODE (expr))
+ {
+ case NULL_EXPR:
+ /* If this is for a scalar, just make a VAR_DECL for it. If for
+ an aggregate, get a null pointer of the appropriate type and
+ dereference it. */
+ if (AGGREGATE_TYPE_P (TREE_TYPE (expr)))
+ *expr_p = build1 (INDIRECT_REF, TREE_TYPE (expr),
+ convert (build_pointer_type (TREE_TYPE (expr)),
+ integer_zero_node));
+ else
+ {
+ *expr_p = create_tmp_var (TREE_TYPE (expr), NULL);
+ TREE_NO_WARNING (*expr_p) = 1;
+ }
+
+ gimplify_and_add (TREE_OPERAND (expr, 0), pre_p);
+ return GS_OK;
+
+ case UNCONSTRAINED_ARRAY_REF:
+ /* We should only do this if we are just elaborating for side-effects,
+ but we can't know that yet. */
+ *expr_p = TREE_OPERAND (*expr_p, 0);
+ return GS_OK;
- if (IF_STMT_TRUE (gnu_stmt))
- expand_expr_stmt (IF_STMT_TRUE (gnu_stmt));
+ case ADDR_EXPR:
+ op = TREE_OPERAND (expr, 0);
- for (gnu_elmt = IF_STMT_ELSEIF (gnu_stmt); gnu_elmt;
- gnu_elmt = TREE_CHAIN (gnu_elmt))
+ /* If we're taking the address of a constant CONSTRUCTOR, force it to
+ be put into static memory. We know it's going to be readonly given
+ the semantics we have and it's required to be static memory in
+ the case when the reference is in an elaboration procedure. */
+ if (TREE_CODE (op) == CONSTRUCTOR && TREE_CONSTANT (op))
{
- expand_start_else ();
- set_lineno_from_sloc (TREE_SLOC (gnu_elmt), 1);
- expand_elseif (IF_STMT_COND (gnu_elmt));
- expand_expr_stmt (IF_STMT_TRUE (gnu_elmt));
+ tree new_var = create_tmp_var (TREE_TYPE (op), "C");
+
+ TREE_READONLY (new_var) = 1;
+ TREE_STATIC (new_var) = 1;
+ TREE_ADDRESSABLE (new_var) = 1;
+ DECL_INITIAL (new_var) = op;
+
+ TREE_OPERAND (expr, 0) = new_var;
+ recompute_tree_invariant_for_addr_expr (expr);
+ return GS_ALL_DONE;
}
- if (IF_STMT_ELSE (gnu_stmt))
+ /* If we are taking the address of a SAVE_EXPR, we are typically
+ processing a misaligned argument to be passed by reference in a
+ procedure call. We just mark the operand as addressable + not
+ readonly here and let the common gimplifier code perform the
+ temporary creation, initialization, and "instantiation" in place of
+ the SAVE_EXPR in further operands, in particular in the copy back
+ code inserted after the call. */
+ else if (TREE_CODE (op) == SAVE_EXPR)
{
- expand_start_else ();
- expand_expr_stmt (IF_STMT_ELSE (gnu_stmt));
+ TREE_ADDRESSABLE (op) = 1;
+ TREE_READONLY (op) = 0;
}
- expand_end_cond ();
- break;
+ /* Otherwise, if we are taking the address of something that is neither
+ reference, declaration, or constant, make a variable for the operand
+ here and then take its address. If we don't do it this way, we may
+ confuse the gimplifier because it needs to know the variable is
+ addressable at this point. This duplicates code in
+ internal_get_tmp_var, which is unfortunate. */
+ else if (TREE_CODE_CLASS (TREE_CODE (op)) != tcc_reference
+ && TREE_CODE_CLASS (TREE_CODE (op)) != tcc_declaration
+ && TREE_CODE_CLASS (TREE_CODE (op)) != tcc_constant)
+ {
+ tree new_var = create_tmp_var (TREE_TYPE (op), "A");
+ tree mod = build2 (GIMPLE_MODIFY_STMT, TREE_TYPE (op), new_var, op);
- case GOTO_STMT:
- TREE_USED (GOTO_STMT_LABEL (gnu_stmt)) = 1;
- expand_goto (GOTO_STMT_LABEL (gnu_stmt));
- break;
+ TREE_ADDRESSABLE (new_var) = 1;
- case LABEL_STMT:
- expand_label (LABEL_STMT_LABEL (gnu_stmt));
- break;
+ if (EXPR_HAS_LOCATION (op))
+ SET_EXPR_LOCUS (mod, EXPR_LOCUS (op));
- case RETURN_STMT:
- if (RETURN_STMT_EXPR (gnu_stmt))
- expand_return (build_binary_op (MODIFY_EXPR, NULL_TREE,
- DECL_RESULT (current_function_decl),
- RETURN_STMT_EXPR (gnu_stmt)));
- else
- expand_null_return ();
- break;
+ gimplify_and_add (mod, pre_p);
+ TREE_OPERAND (expr, 0) = new_var;
+ recompute_tree_invariant_for_addr_expr (expr);
+ return GS_ALL_DONE;
+ }
- case ASM_STMT:
- expand_asm_operands (ASM_STMT_TEMPLATE (gnu_stmt),
- ASM_STMT_OUTPUT (gnu_stmt),
- ASM_STMT_INPUT (gnu_stmt),
- ASM_STMT_CLOBBER (gnu_stmt),
- TREE_THIS_VOLATILE (gnu_stmt), input_location);
-
- /* Copy all the intermediate outputs into the specified outputs. */
- for ((gnu_elmt = ASM_STMT_OUTPUT (gnu_stmt),
- gnu_elmt_2 = ASM_STMT_ORIG_OUT (gnu_stmt));
- gnu_elmt;
- (gnu_elmt = TREE_CHAIN (gnu_elmt),
- gnu_elmt_2 = TREE_CHAIN (gnu_elmt_2)))
- if (TREE_VALUE (gnu_elmt) != TREE_VALUE (gnu_elmt_2))
- {
- expand_expr_stmt
- (build_binary_op (MODIFY_EXPR, NULL_TREE,
- TREE_VALUE (gnu_elmt_2),
- TREE_VALUE (gnu_elmt)));
- free_temp_slots ();
- }
- break;
+ /* ... fall through ... */
+
+ default:
+ return GS_UNHANDLED;
+ }
+}
+
+/* Generate GIMPLE in place for the statement at *STMT_P. */
+
+static enum gimplify_status
+gnat_gimplify_stmt (tree *stmt_p)
+{
+ tree stmt = *stmt_p;
+
+ switch (TREE_CODE (stmt))
+ {
+ case STMT_STMT:
+ *stmt_p = STMT_STMT_STMT (stmt);
+ return GS_OK;
+
+ case LOOP_STMT:
+ {
+ tree gnu_start_label = create_artificial_label ();
+ tree gnu_end_label = LOOP_STMT_LABEL (stmt);
+
+ /* Set to emit the statements of the loop. */
+ *stmt_p = NULL_TREE;
+
+ /* We first emit the start label and then a conditional jump to
+ the end label if there's a top condition, then the body of the
+ loop, then a conditional branch to the end label, then the update,
+ if any, and finally a jump to the start label and the definition
+ of the end label. */
+ append_to_statement_list (build1 (LABEL_EXPR, void_type_node,
+ gnu_start_label),
+ stmt_p);
+
+ if (LOOP_STMT_TOP_COND (stmt))
+ append_to_statement_list (build3 (COND_EXPR, void_type_node,
+ LOOP_STMT_TOP_COND (stmt),
+ alloc_stmt_list (),
+ build1 (GOTO_EXPR,
+ void_type_node,
+ gnu_end_label)),
+ stmt_p);
+
+ append_to_statement_list (LOOP_STMT_BODY (stmt), stmt_p);
+
+ if (LOOP_STMT_BOT_COND (stmt))
+ append_to_statement_list (build3 (COND_EXPR, void_type_node,
+ LOOP_STMT_BOT_COND (stmt),
+ alloc_stmt_list (),
+ build1 (GOTO_EXPR,
+ void_type_node,
+ gnu_end_label)),
+ stmt_p);
+
+ if (LOOP_STMT_UPDATE (stmt))
+ append_to_statement_list (LOOP_STMT_UPDATE (stmt), stmt_p);
+
+ append_to_statement_list (build1 (GOTO_EXPR, void_type_node,
+ gnu_start_label),
+ stmt_p);
+ append_to_statement_list (build1 (LABEL_EXPR, void_type_node,
+ gnu_end_label),
+ stmt_p);
+ return GS_OK;
+ }
+
+ case EXIT_STMT:
+ /* Build a statement to jump to the corresponding end label, then
+ see if it needs to be conditional. */
+ *stmt_p = build1 (GOTO_EXPR, void_type_node, EXIT_STMT_LABEL (stmt));
+ if (EXIT_STMT_COND (stmt))
+ *stmt_p = build3 (COND_EXPR, void_type_node,
+ EXIT_STMT_COND (stmt), *stmt_p, alloc_stmt_list ());
+ return GS_OK;
default:
- abort ();
+ gcc_unreachable ();
}
}
\f
-/* Force references to each of the entities in packages GNAT_NODE with's
- so that the debugging information for all of them are identical
- in all clients. Operate recursively on anything it with's, but check
- that we aren't elaborating something more than once. */
-
-/* The reason for this routine's existence is two-fold.
- First, with some debugging formats, notably MDEBUG on SGI
- IRIX, the linker will remove duplicate debugging information if two
- clients have identical debugguing information. With the normal scheme
- of elaboration, this does not usually occur, since entities in with'ed
- packages are elaborated on demand, and if clients have different usage
- patterns, the normal case, then the order and selection of entities
- will differ. In most cases however, it seems that linkers do not know
- how to eliminate duplicate debugging information, even if it is
- identical, so the use of this routine would increase the total amount
- of debugging information in the final executable.
-
- Second, this routine is called in type_annotate mode, to compute DDA
- information for types in withed units, for ASIS use */
+/* Force references to each of the entities in packages withed by GNAT_NODE.
+ Operate recursively but check that we aren't elaborating something more
+ than once.
+
+ This routine is exclusively called in type_annotate mode, to compute DDA
+ information for types in withed units, for ASIS use. */
static void
elaborate_all_entities (Node_Id gnat_node)
{
Entity_Id gnat_with_clause, gnat_entity;
- /* Process each unit only once. As we trace the context of all relevant
+ /* Process each unit only once. As we trace the context of all relevant
units transitively, including generic bodies, we may encounter the
- same generic unit repeatedly */
-
+ same generic unit repeatedly. */
if (!present_gnu_tree (gnat_node))
- save_gnu_tree (gnat_node, integer_zero_node, 1);
+ save_gnu_tree (gnat_node, integer_zero_node, true);
- /* Save entities in all context units. A body may have an implicit_with
+ /* Save entities in all context units. A body may have an implicit_with
on its own spec, if the context includes a child unit, so don't save
the spec twice. */
-
for (gnat_with_clause = First (Context_Items (gnat_node));
Present (gnat_with_clause);
gnat_with_clause = Next (gnat_with_clause))
if (Nkind (gnat_with_clause) == N_With_Clause
- && ! present_gnu_tree (Library_Unit (gnat_with_clause))
- && Library_Unit (gnat_with_clause) != Library_Unit (Cunit (Main_Unit)))
+ && !present_gnu_tree (Library_Unit (gnat_with_clause))
+ && Library_Unit (gnat_with_clause) != Library_Unit (Cunit (Main_Unit)))
{
elaborate_all_entities (Library_Unit (gnat_with_clause));
&& Ekind (gnat_entity) != E_Package
&& Ekind (gnat_entity) != E_Package_Body
&& Ekind (gnat_entity) != E_Operator
- && ! (IN (Ekind (gnat_entity), Type_Kind)
- && ! Is_Frozen (gnat_entity))
- && ! ((Ekind (gnat_entity) == E_Procedure
- || Ekind (gnat_entity) == E_Function)
- && Is_Intrinsic_Subprogram (gnat_entity))
- && ! IN (Ekind (gnat_entity), Named_Kind)
- && ! IN (Ekind (gnat_entity), Generic_Unit_Kind))
+ && !(IN (Ekind (gnat_entity), Type_Kind)
+ && !Is_Frozen (gnat_entity))
+ && !((Ekind (gnat_entity) == E_Procedure
+ || Ekind (gnat_entity) == E_Function)
+ && Is_Intrinsic_Subprogram (gnat_entity))
+ && !IN (Ekind (gnat_entity), Named_Kind)
+ && !IN (Ekind (gnat_entity), Generic_Unit_Kind))
gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
}
- else if (Ekind (Entity (Name (gnat_with_clause))) == E_Generic_Package)
- {
- Node_Id gnat_body
+ else if (Ekind (Entity (Name (gnat_with_clause))) == E_Generic_Package)
+ {
+ Node_Id gnat_body
= Corresponding_Body (Unit (Library_Unit (gnat_with_clause)));
- /* Retrieve compilation unit node of generic body. */
- while (Present (gnat_body)
+ /* Retrieve compilation unit node of generic body. */
+ while (Present (gnat_body)
&& Nkind (gnat_body) != N_Compilation_Unit)
gnat_body = Parent (gnat_body);
- /* If body is available, elaborate its context. */
- if (Present (gnat_body))
- elaborate_all_entities (gnat_body);
- }
+ /* If body is available, elaborate its context. */
+ if (Present (gnat_body))
+ elaborate_all_entities (gnat_body);
+ }
}
- if (Nkind (Unit (gnat_node)) == N_Package_Body && type_annotate_only)
+ if (Nkind (Unit (gnat_node)) == N_Package_Body)
elaborate_all_entities (Library_Unit (gnat_node));
}
\f
= present_gnu_tree (gnat_entity) ? get_gnu_tree (gnat_entity) : 0;
/* If this entity has an Address representation clause, GNU_OLD is the
- address, so discard it here. */
+ address, so discard it here. */
if (Present (Address_Clause (gnat_entity)))
gnu_old = 0;
/* Don't do anything for subprograms that may have been elaborated before
their freeze nodes. This can happen, for example because of an inner call
- in an instance body. */
- if (gnu_old != 0
- && TREE_CODE (gnu_old) == FUNCTION_DECL
- && (Ekind (gnat_entity) == E_Function
- || Ekind (gnat_entity) == E_Procedure))
+ in an instance body, or a previous compilation of a spec for inlining
+ purposes. */
+ if (gnu_old
+ && ((TREE_CODE (gnu_old) == FUNCTION_DECL
+ && (Ekind (gnat_entity) == E_Function
+ || Ekind (gnat_entity) == E_Procedure))
+ || (gnu_old
+ && TREE_CODE (TREE_TYPE (gnu_old)) == FUNCTION_TYPE
+ && Ekind (gnat_entity) == E_Subprogram_Type)))
return;
- /* If we have a non-dummy type old tree, we have nothing to do. Unless
- this is the public view of a private type whose full view was not
- delayed, this node was never delayed as it should have been.
- Also allow this to happen for concurrent types since we may have
- frozen both the Corresponding_Record_Type and this type. */
- if (gnu_old != 0
- && ! (TREE_CODE (gnu_old) == TYPE_DECL
- && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_old))))
+ /* If we have a non-dummy type old tree, we have nothing to do, except
+ aborting if this is the public view of a private type whose full view was
+ not delayed, as this node was never delayed as it should have been. We
+ let this happen for concurrent types and their Corresponding_Record_Type,
+ however, because each might legitimately be elaborated before it's own
+ freeze node, e.g. while processing the other. */
+ if (gnu_old
+ && !(TREE_CODE (gnu_old) == TYPE_DECL
+ && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_old))))
{
- if (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
- && Present (Full_View (gnat_entity))
- && No (Freeze_Node (Full_View (gnat_entity))))
- return;
- else if (Is_Concurrent_Type (gnat_entity))
- return;
- else
- gigi_abort (320);
+ gcc_assert ((IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
+ && Present (Full_View (gnat_entity))
+ && No (Freeze_Node (Full_View (gnat_entity))))
+ || Is_Concurrent_Type (gnat_entity)
+ || (IN (Ekind (gnat_entity), Record_Kind)
+ && Is_Concurrent_Record_Type (gnat_entity)));
+ return;
}
/* Reset the saved tree, if any, and elaborate the object or type for real.
If there is a full declaration, elaborate it and copy the type to
GNAT_ENTITY. Likewise if this is the record subtype corresponding to
- a class wide type or subtype. */
- if (gnu_old != 0)
+ a class wide type or subtype. */
+ if (gnu_old)
{
- save_gnu_tree (gnat_entity, NULL_TREE, 0);
+ save_gnu_tree (gnat_entity, NULL_TREE, false);
if (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
&& Present (Full_View (gnat_entity))
&& present_gnu_tree (Full_View (gnat_entity)))
- save_gnu_tree (Full_View (gnat_entity), NULL_TREE, 0);
+ save_gnu_tree (Full_View (gnat_entity), NULL_TREE, false);
if (Present (Class_Wide_Type (gnat_entity))
&& Class_Wide_Type (gnat_entity) != gnat_entity)
- save_gnu_tree (Class_Wide_Type (gnat_entity), NULL_TREE, 0);
+ save_gnu_tree (Class_Wide_Type (gnat_entity), NULL_TREE, false);
}
if (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
{
gnu_new = gnat_to_gnu_entity (Full_View (gnat_entity), NULL_TREE, 1);
+ /* Propagate back-annotations from full view to partial view. */
+ if (Unknown_Alignment (gnat_entity))
+ Set_Alignment (gnat_entity, Alignment (Full_View (gnat_entity)));
+
+ if (Unknown_Esize (gnat_entity))
+ Set_Esize (gnat_entity, Esize (Full_View (gnat_entity)));
+
+ if (Unknown_RM_Size (gnat_entity))
+ Set_RM_Size (gnat_entity, RM_Size (Full_View (gnat_entity)));
+
/* The above call may have defined this entity (the simplest example
of this is when we have a private enumeral type since the bounds
will have the public view. */
- if (! present_gnu_tree (gnat_entity))
- save_gnu_tree (gnat_entity, gnu_new, 0);
+ if (!present_gnu_tree (gnat_entity))
+ save_gnu_tree (gnat_entity, gnu_new, false);
if (Present (Class_Wide_Type (gnat_entity))
&& Class_Wide_Type (gnat_entity) != gnat_entity)
- save_gnu_tree (Class_Wide_Type (gnat_entity), gnu_new, 0);
+ save_gnu_tree (Class_Wide_Type (gnat_entity), gnu_new, false);
}
else
gnu_new = gnat_to_gnu_entity (gnat_entity, gnu_init, 1);
/* If we've made any pointers to the old version of this type, we
have to update them. */
- if (gnu_old != 0)
+ if (gnu_old)
update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_old)),
TREE_TYPE (gnu_new));
}
/* If we can inline, generate RTL for all the inlined subprograms.
Define the entity first so we set DECL_EXTERNAL. */
- if (optimize > 0 && ! flag_no_inline)
+ if (optimize > 0 && !flag_really_no_inline)
for (gnat_entity = First_Inlined_Subprogram (gnat_node);
Present (gnat_entity);
gnat_entity = Next_Inlined_Subprogram (gnat_entity))
if (Present (gnat_body))
{
gnat_to_gnu_entity (gnat_entity, NULL_TREE, 0);
- gnat_to_code (gnat_body);
+ add_stmt (gnat_to_gnu (gnat_body));
}
}
}
correspond to the public and private parts of a package. */
static void
-process_decls (List_Id gnat_decls,
- List_Id gnat_decls2,
- Node_Id gnat_end_list,
- int pass1p,
- int pass2p)
+process_decls (List_Id gnat_decls, List_Id gnat_decls2,
+ Node_Id gnat_end_list, bool pass1p, bool pass2p)
{
List_Id gnat_decl_array[2];
Node_Id gnat_decl;
for (gnat_decl = First (gnat_decl_array[i]);
gnat_decl != gnat_end_list; gnat_decl = Next (gnat_decl))
{
- set_lineno (gnat_decl, 0);
-
/* For package specs, we recurse inside the declarations,
thus taking the two pass approach inside the boundary. */
if (Nkind (gnat_decl) == N_Package_Declaration
== N_Package_Specification)))
process_decls (Visible_Declarations (Specification (gnat_decl)),
Private_Declarations (Specification (gnat_decl)),
- Empty, 1, 0);
+ Empty, true, false);
/* Similarly for any declarations in the actions of a
freeze node. */
else if (Nkind (gnat_decl) == N_Freeze_Entity)
{
process_freeze_entity (gnat_decl);
- process_decls (Actions (gnat_decl), Empty, Empty, 1, 0);
+ process_decls (Actions (gnat_decl), Empty, Empty, true, false);
}
/* Package bodies with freeze nodes get their elaboration deferred
Node_Id gnat_subprog_id =
Defining_Entity (Specification (gnat_decl));
- if (Ekind (gnat_subprog_id) != E_Subprogram_Body
+ if (Ekind (gnat_subprog_id) != E_Subprogram_Body
&& Ekind (gnat_subprog_id) != E_Generic_Procedure
&& Ekind (gnat_subprog_id) != E_Generic_Function)
gnat_to_gnu_entity (gnat_subprog_id, NULL_TREE, 1);
/* Concurrent stubs stand for the corresponding subprogram bodies,
which are deferred like other bodies. */
- else if (Nkind (gnat_decl) == N_Task_Body_Stub
- || Nkind (gnat_decl) == N_Protected_Body_Stub)
- ;
-
+ else if (Nkind (gnat_decl) == N_Task_Body_Stub
+ || Nkind (gnat_decl) == N_Protected_Body_Stub)
+ ;
else
- gnat_to_code (gnat_decl);
+ add_stmt (gnat_to_gnu (gnat_decl));
}
/* Here we elaborate everything we deferred above except for package bodies,
|| Nkind (gnat_decl) == N_Subprogram_Body_Stub
|| Nkind (gnat_decl) == N_Task_Body_Stub
|| Nkind (gnat_decl) == N_Protected_Body_Stub)
- gnat_to_code (gnat_decl);
+ add_stmt (gnat_to_gnu (gnat_decl));
else if (Nkind (gnat_decl) == N_Package_Declaration
&& (Nkind (Specification (gnat_decl)
== N_Package_Specification)))
process_decls (Visible_Declarations (Specification (gnat_decl)),
Private_Declarations (Specification (gnat_decl)),
- Empty, 0, 1);
+ Empty, false, true);
else if (Nkind (gnat_decl) == N_Freeze_Entity)
- process_decls (Actions (gnat_decl), Empty, Empty, 0, 1);
+ process_decls (Actions (gnat_decl), Empty, Empty, false, true);
}
}
\f
/* There's no good type to use here, so we might as well use
integer_type_node. Note that the form of the check is
- (not (expr >= lo)) or (not (expr >= hi))
+ (not (expr >= lo)) or (not (expr <= hi))
the reason for this slightly convoluted form is that NaN's
are not considered to be in range in the float case. */
return emit_check
gnu_expr, CE_Index_Check_Failed);
}
\f
-/* Given GNU_COND which contains the condition corresponding to an access,
- discriminant or range check, of value GNU_EXPR, build a COND_EXPR
- that returns GNU_EXPR if GNU_COND is false and raises a
- CONSTRAINT_ERROR if GNU_COND is true. REASON is the code that says
- why the exception was raised. */
+/* GNU_COND contains the condition corresponding to an access, discriminant or
+ range check of value GNU_EXPR. Build a COND_EXPR that returns GNU_EXPR if
+ GNU_COND is false and raises a CONSTRAINT_ERROR if GNU_COND is true.
+ REASON is the code that says why the exception was raised. */
static tree
emit_check (tree gnu_cond, tree gnu_expr, int reason)
tree gnu_call;
tree gnu_result;
- gnu_call = build_call_raise (reason);
+ gnu_call = build_call_raise (reason, Empty, N_Raise_Constraint_Error);
/* Use an outer COMPOUND_EXPR to make sure that GNU_EXPR will get evaluated
in front of the comparison in case it ends up being a SAVE_EXPR. Put the
whole thing inside its own SAVE_EXPR so the inner SAVE_EXPR doesn't leak
out. */
- gnu_result = fold (build (COND_EXPR, TREE_TYPE (gnu_expr), gnu_cond,
- build (COMPOUND_EXPR, TREE_TYPE (gnu_expr),
- gnu_call, gnu_expr),
- gnu_expr));
+ gnu_result = fold_build3 (COND_EXPR, TREE_TYPE (gnu_expr), gnu_cond,
+ build2 (COMPOUND_EXPR, TREE_TYPE (gnu_expr),
+ gnu_call, gnu_expr),
+ gnu_expr);
/* If GNU_EXPR has side effects, make the outer COMPOUND_EXPR and
protect it. Otherwise, show GNU_RESULT has no side effects: we
don't need to evaluate it just for the check. */
if (TREE_SIDE_EFFECTS (gnu_expr))
gnu_result
- = build (COMPOUND_EXPR, TREE_TYPE (gnu_expr), gnu_expr, gnu_result);
+ = build2 (COMPOUND_EXPR, TREE_TYPE (gnu_expr), gnu_expr, gnu_result);
else
TREE_SIDE_EFFECTS (gnu_result) = 0;
truncation; otherwise round. */
static tree
-convert_with_check (Entity_Id gnat_type,
- tree gnu_expr,
- int overflow_p,
- int range_p,
- int truncate_p)
+convert_with_check (Entity_Id gnat_type, tree gnu_expr, bool overflowp,
+ bool rangep, bool truncatep)
{
tree gnu_type = get_unpadded_type (gnat_type);
tree gnu_in_type = TREE_TYPE (gnu_expr);
tree gnu_in_basetype = get_base_type (gnu_in_type);
tree gnu_base_type = get_base_type (gnu_type);
- tree gnu_ada_base_type = get_ada_base_type (gnu_type);
tree gnu_result = gnu_expr;
/* If we are not doing any checks, the output is an integral type, and
the input is not a floating type, just do the conversion. This
shortcut is required to avoid problems with packed array types
and simplifies code in all cases anyway. */
- if (! range_p && ! overflow_p && INTEGRAL_TYPE_P (gnu_base_type)
- && ! FLOAT_TYPE_P (gnu_in_type))
+ if (!rangep && !overflowp && INTEGRAL_TYPE_P (gnu_base_type)
+ && !FLOAT_TYPE_P (gnu_in_type))
return convert (gnu_type, gnu_expr);
/* First convert the expression to its base type. This
/* If overflow checks are requested, we need to be sure the result will
fit in the output base type. But don't do this if the input
is integer and the output floating-point. */
- if (overflow_p
- && ! (FLOAT_TYPE_P (gnu_base_type) && INTEGRAL_TYPE_P (gnu_in_basetype)))
+ if (overflowp
+ && !(FLOAT_TYPE_P (gnu_base_type) && INTEGRAL_TYPE_P (gnu_in_basetype)))
{
/* Ensure GNU_EXPR only gets evaluated once. */
tree gnu_input = protect_multiple_eval (gnu_result);
convert (gnu_in_basetype,
gnu_out_ub))));
- if (! integer_zerop (gnu_cond))
+ if (!integer_zerop (gnu_cond))
gnu_result = emit_check (gnu_cond, gnu_input,
CE_Overflow_Check_Failed);
}
/* Now convert to the result base type. If this is a non-truncating
float-to-integer conversion, round. */
- if (INTEGRAL_TYPE_P (gnu_ada_base_type) && FLOAT_TYPE_P (gnu_in_basetype)
- && ! truncate_p)
+ if (INTEGRAL_TYPE_P (gnu_base_type) && FLOAT_TYPE_P (gnu_in_basetype)
+ && !truncatep)
{
- tree gnu_point_5 = build_real (gnu_in_basetype, dconstp5);
- tree gnu_minus_point_5 = build_real (gnu_in_basetype, dconstmp5);
- tree gnu_zero = convert (gnu_in_basetype, integer_zero_node);
- tree gnu_saved_result = save_expr (gnu_result);
- tree gnu_comp = build (GE_EXPR, integer_type_node,
- gnu_saved_result, gnu_zero);
- tree gnu_adjust = build (COND_EXPR, gnu_in_basetype, gnu_comp,
- gnu_point_5, gnu_minus_point_5);
-
- gnu_result
- = build (PLUS_EXPR, gnu_in_basetype, gnu_saved_result, gnu_adjust);
+ REAL_VALUE_TYPE half_minus_pred_half, pred_half;
+ tree gnu_conv, gnu_zero, gnu_comp, gnu_saved_result, calc_type;
+ tree gnu_pred_half, gnu_add_pred_half, gnu_subtract_pred_half;
+ const struct real_format *fmt;
+
+ /* The following calculations depend on proper rounding to even
+ of each arithmetic operation. In order to prevent excess
+ precision from spoiling this property, use the widest hardware
+ floating-point type.
+
+ FIXME: For maximum efficiency, this should only be done for machines
+ and types where intermediates may have extra precision. */
+
+ calc_type = longest_float_type_node;
+ /* FIXME: Should not have padding in the first place */
+ if (TREE_CODE (calc_type) == RECORD_TYPE
+ && TYPE_IS_PADDING_P (calc_type))
+ calc_type = TREE_TYPE (TYPE_FIELDS (calc_type));
+
+ /* Compute the exact value calc_type'Pred (0.5) at compile time. */
+ fmt = REAL_MODE_FORMAT (TYPE_MODE (calc_type));
+ real_2expN (&half_minus_pred_half, -(fmt->p) - 1, TYPE_MODE (calc_type));
+ REAL_ARITHMETIC (pred_half, MINUS_EXPR, dconsthalf,
+ half_minus_pred_half);
+ gnu_pred_half = build_real (calc_type, pred_half);
+
+ /* If the input is strictly negative, subtract this value
+ and otherwise add it from the input. For 0.5, the result
+ is exactly between 1.0 and the machine number preceding 1.0
+ (for calc_type). Since the last bit of 1.0 is even, this 0.5
+ will round to 1.0, while all other number with an absolute
+ value less than 0.5 round to 0.0. For larger numbers exactly
+ halfway between integers, rounding will always be correct as
+ the true mathematical result will be closer to the higher
+ integer compared to the lower one. So, this constant works
+ for all floating-point numbers.
+
+ The reason to use the same constant with subtract/add instead
+ of a positive and negative constant is to allow the comparison
+ to be scheduled in parallel with retrieval of the constant and
+ conversion of the input to the calc_type (if necessary).
+ */
+
+ gnu_zero = convert (gnu_in_basetype, integer_zero_node);
+ gnu_saved_result = save_expr (gnu_result);
+ gnu_conv = convert (calc_type, gnu_saved_result);
+ gnu_comp = build2 (GE_EXPR, integer_type_node,
+ gnu_saved_result, gnu_zero);
+ gnu_add_pred_half
+ = build2 (PLUS_EXPR, calc_type, gnu_conv, gnu_pred_half);
+ gnu_subtract_pred_half
+ = build2 (MINUS_EXPR, calc_type, gnu_conv, gnu_pred_half);
+ gnu_result = build3 (COND_EXPR, calc_type, gnu_comp,
+ gnu_add_pred_half, gnu_subtract_pred_half);
}
- if (TREE_CODE (gnu_ada_base_type) == INTEGER_TYPE
- && TYPE_HAS_ACTUAL_BOUNDS_P (gnu_ada_base_type)
+ if (TREE_CODE (gnu_base_type) == INTEGER_TYPE
+ && TYPE_HAS_ACTUAL_BOUNDS_P (gnu_base_type)
&& TREE_CODE (gnu_result) == UNCONSTRAINED_ARRAY_REF)
- gnu_result = unchecked_convert (gnu_ada_base_type, gnu_result, 0);
+ gnu_result = unchecked_convert (gnu_base_type, gnu_result, false);
else
- gnu_result = convert (gnu_ada_base_type, gnu_result);
+ gnu_result = convert (gnu_base_type, gnu_result);
/* Finally, do the range check if requested. Note that if the
result type is a modular type, the range check is actually
an overflow check. */
- if (range_p
+ if (rangep
|| (TREE_CODE (gnu_base_type) == INTEGER_TYPE
- && TYPE_MODULAR_P (gnu_base_type) && overflow_p))
+ && TYPE_MODULAR_P (gnu_base_type) && overflowp))
gnu_result = emit_range_check (gnu_result, gnat_type);
return convert (gnu_type, gnu_result);
}
\f
/* Return 1 if GNU_EXPR can be directly addressed. This is the case unless
- it is an expression involving computation or if it involves a bitfield
- reference. This returns the same as gnat_mark_addressable in most
- cases. */
+ it is an expression involving computation or if it involves a reference
+ to a bitfield or to a field not sufficiently aligned for its type. */
-static int
+static bool
addressable_p (tree gnu_expr)
{
switch (TREE_CODE (gnu_expr))
case RESULT_DECL:
/* All DECLs are addressable: if they are in a register, we can force
them to memory. */
- return 1;
+ return true;
case UNCONSTRAINED_ARRAY_REF:
case INDIRECT_REF:
case CONSTRUCTOR:
case NULL_EXPR:
case SAVE_EXPR:
- return 1;
+ return true;
case COMPONENT_REF:
- return (! DECL_BIT_FIELD (TREE_OPERAND (gnu_expr, 1))
- && (! DECL_NONADDRESSABLE_P (TREE_OPERAND (gnu_expr, 1))
- || ! flag_strict_aliasing)
+ return (!DECL_BIT_FIELD (TREE_OPERAND (gnu_expr, 1))
+ && (!STRICT_ALIGNMENT
+ /* Even with DECL_BIT_FIELD cleared, we have to ensure that
+ the field is sufficiently aligned, in case it is subject
+ to a pragma Component_Alignment. But we don't need to
+ check the alignment of the containing record, as it is
+ guaranteed to be not smaller than that of its most
+ aligned field that is not a bit-field. */
+ || DECL_ALIGN (TREE_OPERAND (gnu_expr, 1))
+ >= TYPE_ALIGN (TREE_TYPE (gnu_expr)))
&& addressable_p (TREE_OPERAND (gnu_expr, 0)));
case ARRAY_REF: case ARRAY_RANGE_REF:
}
default:
- return 0;
+ return false;
}
}
\f
/* Do the processing for the declaration of a GNAT_ENTITY, a type. If
a separate Freeze node exists, delay the bulk of the processing. Otherwise
- make a GCC type for GNAT_ENTITY and set up the correspondance. */
+ make a GCC type for GNAT_ENTITY and set up the correspondence. */
void
process_type (Entity_Id gnat_entity)
|| (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
&& Present (Full_View (gnat_entity))
&& Freeze_Node (Full_View (gnat_entity))
- && ! present_gnu_tree (Full_View (gnat_entity))))
+ && !present_gnu_tree (Full_View (gnat_entity))))
{
elaborate_entity (gnat_entity);
- if (gnu_old == 0)
+ if (!gnu_old)
{
tree gnu_decl = create_type_decl (get_entity_name (gnat_entity),
make_dummy_type (gnat_entity),
- 0, 0, 0);
+ NULL, false, false, gnat_entity);
- save_gnu_tree (gnat_entity, gnu_decl, 0);
+ save_gnu_tree (gnat_entity, gnu_decl, false);
if (IN (Ekind (gnat_entity), Incomplete_Or_Private_Kind)
&& Present (Full_View (gnat_entity)))
- save_gnu_tree (Full_View (gnat_entity), gnu_decl, 0);
+ save_gnu_tree (Full_View (gnat_entity), gnu_decl, false);
}
return;
made the type that corresponds to the full type of an incomplete
type. Clear that type for now and then update the type in the
pointers. */
- if (gnu_old != 0)
+ if (gnu_old)
{
- if (TREE_CODE (gnu_old) != TYPE_DECL
- || ! TYPE_IS_DUMMY_P (TREE_TYPE (gnu_old)))
- {
- /* If this was a withed access type, this is not an error
- and merely indicates we've already elaborated the type
- already. */
- if (Is_Type (gnat_entity) && From_With_Type (gnat_entity))
- return;
-
- gigi_abort (323);
- }
+ gcc_assert (TREE_CODE (gnu_old) == TYPE_DECL
+ && TYPE_IS_DUMMY_P (TREE_TYPE (gnu_old)));
- save_gnu_tree (gnat_entity, NULL_TREE, 0);
+ save_gnu_tree (gnat_entity, NULL_TREE, false);
}
/* Now fully elaborate the type. */
gnu_new = gnat_to_gnu_entity (gnat_entity, NULL_TREE, 1);
- if (TREE_CODE (gnu_new) != TYPE_DECL)
- gigi_abort (324);
+ gcc_assert (TREE_CODE (gnu_new) == TYPE_DECL);
/* If we have an old type and we've made pointers to this type,
update those pointers. */
- if (gnu_old != 0)
+ if (gnu_old)
update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_old)),
TREE_TYPE (gnu_new));
= get_gnu_tree (Corresponding_Concurrent_Type (gnat_entity));
save_gnu_tree (Corresponding_Concurrent_Type (gnat_entity),
- NULL_TREE, 0);
+ NULL_TREE, false);
save_gnu_tree (Corresponding_Concurrent_Type (gnat_entity),
- gnu_new, 0);
+ gnu_new, false);
update_pointer_to (TYPE_MAIN_VARIANT (TREE_TYPE (gnu_task_old)),
TREE_TYPE (gnu_new));
}
}
\f
-/* GNAT_ASSOC is the front of the Component_Associations of an N_Aggregate.
- GNU_TYPE is the GCC type of the corresponding record.
+/* GNAT_ENTITY is the type of the resulting constructors,
+ GNAT_ASSOC is the front of the Component_Associations of an N_Aggregate,
+ and GNU_TYPE is the GCC type of the corresponding record.
Return a CONSTRUCTOR to build the record. */
static tree
-assoc_to_constructor (Node_Id gnat_assoc, tree gnu_type)
+assoc_to_constructor (Entity_Id gnat_entity, Node_Id gnat_assoc, tree gnu_type)
{
- tree gnu_field, gnu_list, gnu_result;
+ tree gnu_list, gnu_result;
/* We test for GNU_FIELD being empty in the case where a variant
was the last thing since we don't take things off GNAT_ASSOC in
gnat_assoc = Next (gnat_assoc))
{
Node_Id gnat_field = First (Choices (gnat_assoc));
- tree gnu_field = gnat_to_gnu_entity (Entity (gnat_field), NULL_TREE, 0);
+ tree gnu_field = gnat_to_gnu_field_decl (Entity (gnat_field));
tree gnu_expr = gnat_to_gnu (Expression (gnat_assoc));
/* The expander is supposed to put a single component selector name
in every record component association */
- if (Next (gnat_field))
- gigi_abort (328);
+ gcc_assert (No (Next (gnat_field)));
+
+ /* Ignore fields that have Corresponding_Discriminants since we'll
+ be setting that field in the parent. */
+ if (Present (Corresponding_Discriminant (Entity (gnat_field)))
+ && Is_Tagged_Type (Scope (Entity (gnat_field))))
+ continue;
+
+ /* Also ignore discriminants of Unchecked_Unions. */
+ else if (Is_Unchecked_Union (gnat_entity)
+ && Ekind (Entity (gnat_field)) == E_Discriminant)
+ continue;
/* Before assigning a value in an aggregate make sure range checks
are done if required. Then convert to the type of the field. */
gnu_result = extract_values (gnu_list, gnu_type);
- /* Verify every enty in GNU_LIST was used. */
- for (gnu_field = gnu_list; gnu_field; gnu_field = TREE_CHAIN (gnu_field))
- if (! TREE_ADDRESSABLE (gnu_field))
- gigi_abort (311);
+#ifdef ENABLE_CHECKING
+ {
+ tree gnu_field;
+
+ /* Verify every enty in GNU_LIST was used. */
+ for (gnu_field = gnu_list; gnu_field; gnu_field = TREE_CHAIN (gnu_field))
+ gcc_assert (TREE_ADDRESSABLE (gnu_field));
+ }
+#endif
return gnu_result;
}
of the array component. It is needed for range checking. */
static tree
-pos_to_constructor (Node_Id gnat_expr,
- tree gnu_array_type,
+pos_to_constructor (Node_Id gnat_expr, tree gnu_array_type,
Entity_Id gnat_component_type)
{
- tree gnu_expr;
tree gnu_expr_list = NULL_TREE;
+ tree gnu_index = TYPE_MIN_VALUE (TYPE_DOMAIN (gnu_array_type));
+ tree gnu_expr;
for ( ; Present (gnat_expr); gnat_expr = Next (gnat_expr))
{
}
gnu_expr_list
- = tree_cons (NULL_TREE, convert (TREE_TYPE (gnu_array_type), gnu_expr),
+ = tree_cons (gnu_index, convert (TREE_TYPE (gnu_array_type), gnu_expr),
gnu_expr_list);
+
+ gnu_index = int_const_binop (PLUS_EXPR, gnu_index, integer_one_node, 0);
}
return gnat_build_constructor (gnu_array_type, nreverse (gnu_expr_list));
/* _Parent is an internal field, but may have values in the aggregate,
so check for values first. */
- if ((tem = purpose_member (field, values)) != 0)
+ if ((tem = purpose_member (field, values)))
{
value = TREE_VALUE (tem);
TREE_ADDRESSABLE (tem) = 1;
{
value = extract_values (values, TREE_TYPE (field));
if (TREE_CODE (value) == CONSTRUCTOR
- && CONSTRUCTOR_ELTS (value) == 0)
+ && VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (value)))
value = 0;
}
else
TREE_ADDRESSABLE (tem) = 1;
}
- if (value == 0)
+ if (!value)
continue;
result = tree_cons (field, value, result);
tree type = TREE_TYPE (exp);
/* If this has no side effects, we don't need to do anything. */
- if (! TREE_SIDE_EFFECTS (exp))
+ if (!TREE_SIDE_EFFECTS (exp))
return exp;
/* If it is a conversion, protect what's inside the conversion.
exp)));
}
\f
-/* This is equivalent to stabilize_reference in GCC's tree.c, but we know
- how to handle our new nodes and we take an extra argument that says
- whether to force evaluation of everything. */
+/* This is equivalent to stabilize_reference in tree.c, but we know how to
+ handle our own nodes and we take extra arguments. FORCE says whether to
+ force evaluation of everything. We set SUCCESS to true unless we walk
+ through something we don't know how to stabilize. */
tree
-gnat_stabilize_reference (tree ref, int force)
+maybe_stabilize_reference (tree ref, bool force, bool *success)
{
tree type = TREE_TYPE (ref);
enum tree_code code = TREE_CODE (ref);
tree result;
+ /* Assume we'll success unless proven otherwise. */
+ *success = true;
+
switch (code)
{
+ case CONST_DECL:
case VAR_DECL:
case PARM_DECL:
case RESULT_DECL:
/* No action is needed in this case. */
return ref;
+ case ADDR_EXPR:
case NOP_EXPR:
case CONVERT_EXPR:
case FLOAT_EXPR:
case FIX_TRUNC_EXPR:
- case FIX_FLOOR_EXPR:
- case FIX_ROUND_EXPR:
- case FIX_CEIL_EXPR:
case VIEW_CONVERT_EXPR:
- case ADDR_EXPR:
result
= build1 (code, type,
- gnat_stabilize_reference (TREE_OPERAND (ref, 0), force));
+ maybe_stabilize_reference (TREE_OPERAND (ref, 0), force,
+ success));
break;
case INDIRECT_REF:
break;
case COMPONENT_REF:
- result = build (COMPONENT_REF, type,
- gnat_stabilize_reference (TREE_OPERAND (ref, 0),
- force),
- TREE_OPERAND (ref, 1));
+ result = build3 (COMPONENT_REF, type,
+ maybe_stabilize_reference (TREE_OPERAND (ref, 0), force,
+ success),
+ TREE_OPERAND (ref, 1), NULL_TREE);
break;
case BIT_FIELD_REF:
- result = build (BIT_FIELD_REF, type,
- gnat_stabilize_reference (TREE_OPERAND (ref, 0), force),
- gnat_stabilize_reference_1 (TREE_OPERAND (ref, 1),
- force),
- gnat_stabilize_reference_1 (TREE_OPERAND (ref, 2),
- force));
+ result = build3 (BIT_FIELD_REF, type,
+ maybe_stabilize_reference (TREE_OPERAND (ref, 0), force,
+ success),
+ gnat_stabilize_reference_1 (TREE_OPERAND (ref, 1),
+ force),
+ gnat_stabilize_reference_1 (TREE_OPERAND (ref, 2),
+ force));
break;
case ARRAY_REF:
- result = build (ARRAY_REF, type,
- gnat_stabilize_reference (TREE_OPERAND (ref, 0), force),
- gnat_stabilize_reference_1 (TREE_OPERAND (ref, 1),
- force));
- break;
-
case ARRAY_RANGE_REF:
- result = build (ARRAY_RANGE_REF, type,
- gnat_stabilize_reference (TREE_OPERAND (ref, 0), force),
- gnat_stabilize_reference_1 (TREE_OPERAND (ref, 1),
- force));
+ result = build4 (code, type,
+ maybe_stabilize_reference (TREE_OPERAND (ref, 0), force,
+ success),
+ gnat_stabilize_reference_1 (TREE_OPERAND (ref, 1),
+ force),
+ NULL_TREE, NULL_TREE);
break;
case COMPOUND_EXPR:
- result = build (COMPOUND_EXPR, type,
- gnat_stabilize_reference_1 (TREE_OPERAND (ref, 0),
- force),
- gnat_stabilize_reference (TREE_OPERAND (ref, 1),
- force));
+ result = gnat_stabilize_reference_1 (ref, force);
break;
- case RTL_EXPR:
- result = build1 (INDIRECT_REF, type,
- save_expr (build1 (ADDR_EXPR,
- build_reference_type (type), ref)));
+ case CALL_EXPR:
+ /* This generates better code than the scheme in protect_multiple_eval
+ because large objects will be returned via invisible reference in
+ most ABIs so the temporary will directly be filled by the callee. */
+ result = gnat_stabilize_reference_1 (ref, force);
break;
+ case ERROR_MARK:
+ ref = error_mark_node;
+
+ /* ... Fallthru to failure ... */
+
/* If arg isn't a kind of lvalue we recognize, make no change.
Caller should recognize the error for an invalid lvalue. */
default:
+ *success = false;
return ref;
-
- case ERROR_MARK:
- return error_mark_node;
}
TREE_READONLY (result) = TREE_READONLY (ref);
+
+ /* TREE_THIS_VOLATILE and TREE_SIDE_EFFECTS attached to the initial
+ expression may not be sustained across some paths, such as the way via
+ build1 for INDIRECT_REF. We re-populate those flags here for the general
+ case, which is consistent with the GCC version of this routine.
+
+ Special care should be taken regarding TREE_SIDE_EFFECTS, because some
+ paths introduce side effects where there was none initially (e.g. calls
+ to save_expr), and we also want to keep track of that. */
+
+ TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (ref);
+ TREE_SIDE_EFFECTS (result) |= TREE_SIDE_EFFECTS (ref);
+
return result;
}
+/* Wrapper around maybe_stabilize_reference, for common uses without
+ lvalue restrictions and without need to examine the success
+ indication. */
+
+static tree
+gnat_stabilize_reference (tree ref, bool force)
+{
+ bool dummy;
+ return maybe_stabilize_reference (ref, force, &dummy);
+}
+
/* Similar to stabilize_reference_1 in tree.c, but supports an extra
arg to force a SAVE_EXPR for everything. */
static tree
-gnat_stabilize_reference_1 (tree e, int force)
+gnat_stabilize_reference_1 (tree e, bool force)
{
enum tree_code code = TREE_CODE (e);
tree type = TREE_TYPE (e);
switch (TREE_CODE_CLASS (code))
{
- case 'x':
- case 't':
- case 'd':
- case 'b':
- case '<':
- case 's':
- case 'e':
- case 'r':
- if (TREE_SIDE_EFFECTS (e) || force)
+ case tcc_exceptional:
+ case tcc_type:
+ case tcc_declaration:
+ case tcc_comparison:
+ case tcc_statement:
+ case tcc_expression:
+ case tcc_reference:
+ case tcc_vl_exp:
+ /* If this is a COMPONENT_REF of a fat pointer, save the entire
+ fat pointer. This may be more efficient, but will also allow
+ us to more easily find the match for the PLACEHOLDER_EXPR. */
+ if (code == COMPONENT_REF
+ && TYPE_FAT_POINTER_P (TREE_TYPE (TREE_OPERAND (e, 0))))
+ result = build3 (COMPONENT_REF, type,
+ gnat_stabilize_reference_1 (TREE_OPERAND (e, 0),
+ force),
+ TREE_OPERAND (e, 1), TREE_OPERAND (e, 2));
+ else if (TREE_SIDE_EFFECTS (e) || force)
return save_expr (e);
- return e;
+ else
+ return e;
+ break;
- case 'c':
+ case tcc_constant:
/* Constants need no processing. In fact, we should never reach
here. */
return e;
- case '2':
+ case tcc_binary:
/* Recursively stabilize each operand. */
- result = build (code, type,
- gnat_stabilize_reference_1 (TREE_OPERAND (e, 0), force),
- gnat_stabilize_reference_1 (TREE_OPERAND (e, 1), force));
+ result = build2 (code, type,
+ gnat_stabilize_reference_1 (TREE_OPERAND (e, 0), force),
+ gnat_stabilize_reference_1 (TREE_OPERAND (e, 1),
+ force));
break;
- case '1':
+ case tcc_unary:
/* Recursively stabilize each operand. */
result = build1 (code, type,
gnat_stabilize_reference_1 (TREE_OPERAND (e, 0),
break;
default:
- abort ();
+ gcc_unreachable ();
}
TREE_READONLY (result) = TREE_READONLY (e);
- return result;
-}
-\f
-/* GNAT_UNIT is the Defining_Identifier for some package or subprogram,
- either a spec or a body, BODY_P says which. If needed, make a function
- to be the elaboration routine for that object and perform the elaborations
- in GNU_ELAB_LIST.
-
- Return 1 if we didn't need an elaboration function, zero otherwise. */
-
-static int
-build_unit_elab (Entity_Id gnat_unit, int body_p, tree gnu_elab_list)
-{
- tree gnu_decl;
- rtx insn;
- int result = 1;
-
- /* If we have nothing to do, return. */
- if (gnu_elab_list == 0)
- return 1;
-
- /* Prevent the elaboration list from being reclaimed by the GC. */
- gnu_pending_elaboration_lists = chainon (gnu_pending_elaboration_lists,
- gnu_elab_list);
-
- /* Set our file and line number to that of the object and set up the
- elaboration routine. */
- gnu_decl = create_subprog_decl (create_concat_name (gnat_unit,
- body_p ?
- "elabb" : "elabs"),
- NULL_TREE, void_ftype, NULL_TREE, 0, 1, 0,
- 0);
- DECL_ELABORATION_PROC_P (gnu_decl) = 1;
-
- begin_subprog_body (gnu_decl);
- set_lineno (gnat_unit, 1);
- pushlevel (0);
- gnu_block_stack = tree_cons (NULL_TREE, NULL_TREE, gnu_block_stack);
- expand_start_bindings (0);
-
- /* Emit the assignments for the elaborations we have to do. If there
- is no destination, this is just a call to execute some statement
- that was placed within the declarative region. But first save a
- pointer so we can see if any insns were generated. */
-
- insn = get_last_insn ();
-
- for (; gnu_elab_list; gnu_elab_list = TREE_CHAIN (gnu_elab_list))
- if (TREE_PURPOSE (gnu_elab_list) == NULL_TREE)
- {
- if (TREE_VALUE (gnu_elab_list) != 0)
- expand_expr_stmt (TREE_VALUE (gnu_elab_list));
- }
- else
- {
- tree lhs = TREE_PURPOSE (gnu_elab_list);
-
- input_location = DECL_SOURCE_LOCATION (lhs);
-
- /* If LHS has a padded type, convert it to the unpadded type
- so the assignment is done properly. */
- if (TREE_CODE (TREE_TYPE (lhs)) == RECORD_TYPE
- && TYPE_IS_PADDING_P (TREE_TYPE (lhs)))
- lhs = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (lhs))), lhs);
-
- emit_line_note (input_location);
- expand_expr_stmt (build_binary_op (MODIFY_EXPR, NULL_TREE,
- TREE_PURPOSE (gnu_elab_list),
- TREE_VALUE (gnu_elab_list)));
- }
-
- /* See if any non-NOTE insns were generated. */
- for (insn = NEXT_INSN (insn); insn; insn = NEXT_INSN (insn))
- if (GET_RTX_CLASS (GET_CODE (insn)) == RTX_INSN)
- {
- result = 0;
- break;
- }
-
- expand_end_bindings (getdecls (), kept_level_p (), -1);
- poplevel (kept_level_p (), 1, 0);
- gnu_block_stack = TREE_CHAIN (gnu_block_stack);
- end_subprog_body ();
-
- /* We are finished with the elaboration list it can now be discarded. */
- gnu_pending_elaboration_lists = TREE_CHAIN (gnu_pending_elaboration_lists);
- /* If there were no insns, we don't need an elab routine. It would
- be nice to not output this one, but there's no good way to do that. */
+ TREE_THIS_VOLATILE (result) = TREE_THIS_VOLATILE (e);
+ TREE_SIDE_EFFECTS (result) |= TREE_SIDE_EFFECTS (e);
return result;
}
\f
extern char *__gnat_to_canonical_file_spec (char *);
-/* Determine the input_filename and the input_line from the source location
- (Sloc) of GNAT_NODE node. Set the global variable input_filename and
- input_line. If WRITE_NOTE_P is true, emit a line number note. */
-
-void
-set_lineno (Node_Id gnat_node, int write_note_p)
-{
- Source_Ptr source_location = Sloc (gnat_node);
-
- set_lineno_from_sloc (source_location, write_note_p);
-}
-
-/* Likewise, but passed a Sloc. */
+/* Convert Sloc into *LOCUS (a location_t). Return true if this Sloc
+ corresponds to a source code location and false if it doesn't. In the
+ latter case, we don't update *LOCUS. We also set the Gigi global variable
+ REF_FILENAME to the reference file name as given by sinput (i.e no
+ directory). */
-void
-set_lineno_from_sloc (Source_Ptr source_location, int write_note_p)
+bool
+Sloc_to_locus (Source_Ptr Sloc, location_t *locus)
{
/* If node not from source code, ignore. */
- if (source_location < 0)
- return;
+ if (Sloc < 0)
+ return false;
/* Use the identifier table to make a hashed, permanent copy of the filename,
since the name table gets reallocated after Gigi returns but before all
the debugging information is output. The __gnat_to_canonical_file_spec
call translates filenames from pragmas Source_Reference that contain host
style syntax not understood by gdb. */
- input_filename
+ locus->file
= IDENTIFIER_POINTER
(get_identifier
(__gnat_to_canonical_file_spec
- (Get_Name_String
- (Full_Debug_Name (Get_Source_File_Index (source_location))))));
+ (Get_Name_String (Full_Debug_Name (Get_Source_File_Index (Sloc))))));
+
+ locus->line = Get_Logical_Line_Number (Sloc);
- /* ref_filename is the reference file name as given by sinput (i.e no
- directory) */
ref_filename
= IDENTIFIER_POINTER
(get_identifier
- (Get_Name_String
- (Debug_Source_Name (Get_Source_File_Index (source_location)))));;
- input_line = Get_Logical_Line_Number (source_location);
+ (Get_Name_String (Debug_Source_Name (Get_Source_File_Index (Sloc)))));;
+
+ return true;
+}
+
+/* Similar to annotate_with_locus, but start with the Sloc of GNAT_NODE and
+ don't do anything if it doesn't correspond to a source location. */
- if (write_note_p)
- emit_line_note (input_location);
+static void
+annotate_with_node (tree node, Node_Id gnat_node)
+{
+ location_t locus;
+
+ if (!Sloc_to_locus (Sloc (gnat_node), &locus))
+ return;
+
+ annotate_with_locus (node, locus);
}
\f
/* Post an error message. MSG is the error message, properly annotated.
else
start_yes = '[', end_yes = ']', start_no = '{', end_no = '}';
- for (p = msg, q = newmsg; *p != 0; p++)
+ for (p = msg, q = newmsg; *p; p++)
{
if (*p == start_yes)
for (p++; *p != end_yes; p++)
Error_Msg_Uint_2 = UI_From_Int (num);
post_error_ne_tree (msg, node, ent, t);
}
-
-/* Set the node for a second '&' in the error message. */
-
-void
-set_second_error_entity (Entity_Id e)
-{
- Error_Msg_Node_2 = e;
-}
-\f
-/* Signal abort, with "Gigi abort" as the error label, and error_gnat_node
- as the relevant node that provides the location info for the error */
-
-void
-gigi_abort (int code)
-{
- String_Template temp = {1, 10};
- Fat_Pointer fp;
-
- fp.Array = "Gigi abort", fp.Bounds = &temp;
-
- Current_Error_Node = error_gnat_node;
- Compiler_Abort (fp, code);
-}
\f
/* Initialize the table that maps GNAT codes to GCC codes for simple
binary and unary operations. */
}
#include "gt-ada-trans.h"
+/* Return a label to branch to for the exception type in KIND or NULL_TREE
+ if none. */
+
+tree
+get_exception_label (char kind)
+{
+ if (kind == N_Raise_Constraint_Error)
+ return TREE_VALUE (gnu_constraint_error_label_stack);
+ else if (kind == N_Raise_Storage_Error)
+ return TREE_VALUE (gnu_storage_error_label_stack);
+ else if (kind == N_Raise_Program_Error)
+ return TREE_VALUE (gnu_program_error_label_stack);
+ else
+ return NULL_TREE;
+}
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