| /**************************************************************************** |
| * * |
| * GNAT COMPILER COMPONENTS * |
| * * |
| * U T I L S * |
| * * |
| * C Implementation File * |
| * * |
| * Copyright (C) 1992-2008, 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- * |
| * ware Foundation; either version 3, or (at your option) any later ver- * |
| * sion. GNAT is distributed in the hope that it will be useful, but WITH- * |
| * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * |
| * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * |
| * for more details. You should have received a copy of the GNU General * |
| * Public License along with GCC; see the file COPYING3. If not see * |
| * <http://www.gnu.org/licenses/>. * |
| * * |
| * GNAT was originally developed by the GNAT team at New York University. * |
| * Extensive contributions were provided by Ada Core Technologies Inc. * |
| * * |
| ****************************************************************************/ |
| |
| /* We have attribute handlers using C specific format specifiers in warning |
| messages. Make sure they are properly recognized. */ |
| #define GCC_DIAG_STYLE __gcc_cdiag__ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "coretypes.h" |
| #include "tm.h" |
| #include "tree.h" |
| #include "flags.h" |
| #include "defaults.h" |
| #include "toplev.h" |
| #include "output.h" |
| #include "ggc.h" |
| #include "debug.h" |
| #include "convert.h" |
| #include "target.h" |
| #include "function.h" |
| #include "cgraph.h" |
| #include "tree-inline.h" |
| #include "tree-iterator.h" |
| #include "gimple.h" |
| #include "tree-dump.h" |
| #include "pointer-set.h" |
| #include "langhooks.h" |
| |
| #include "ada.h" |
| #include "types.h" |
| #include "atree.h" |
| #include "elists.h" |
| #include "namet.h" |
| #include "nlists.h" |
| #include "stringt.h" |
| #include "uintp.h" |
| #include "fe.h" |
| #include "sinfo.h" |
| #include "einfo.h" |
| #include "ada-tree.h" |
| #include "gigi.h" |
| |
| #ifndef MAX_FIXED_MODE_SIZE |
| #define MAX_FIXED_MODE_SIZE GET_MODE_BITSIZE (DImode) |
| #endif |
| |
| #ifndef MAX_BITS_PER_WORD |
| #define MAX_BITS_PER_WORD BITS_PER_WORD |
| #endif |
| |
| /* If nonzero, pretend we are allocating at global level. */ |
| int force_global; |
| |
| /* Tree nodes for the various types and decls we create. */ |
| tree gnat_std_decls[(int) ADT_LAST]; |
| |
| /* Functions to call for each of the possible raise reasons. */ |
| tree gnat_raise_decls[(int) LAST_REASON_CODE + 1]; |
| |
| /* Forward declarations for handlers of attributes. */ |
| static tree handle_const_attribute (tree *, tree, tree, int, bool *); |
| static tree handle_nothrow_attribute (tree *, tree, tree, int, bool *); |
| static tree handle_pure_attribute (tree *, tree, tree, int, bool *); |
| static tree handle_novops_attribute (tree *, tree, tree, int, bool *); |
| static tree handle_nonnull_attribute (tree *, tree, tree, int, bool *); |
| static tree handle_sentinel_attribute (tree *, tree, tree, int, bool *); |
| static tree handle_noreturn_attribute (tree *, tree, tree, int, bool *); |
| static tree handle_malloc_attribute (tree *, tree, tree, int, bool *); |
| static tree handle_type_generic_attribute (tree *, tree, tree, int, bool *); |
| |
| /* Fake handler for attributes we don't properly support, typically because |
| they'd require dragging a lot of the common-c front-end circuitry. */ |
| static tree fake_attribute_handler (tree *, tree, tree, int, bool *); |
| |
| /* Table of machine-independent internal attributes for Ada. We support |
| this minimal set of attributes to accommodate the needs of builtins. */ |
| const struct attribute_spec gnat_internal_attribute_table[] = |
| { |
| /* { name, min_len, max_len, decl_req, type_req, fn_type_req, handler } */ |
| { "const", 0, 0, true, false, false, handle_const_attribute }, |
| { "nothrow", 0, 0, true, false, false, handle_nothrow_attribute }, |
| { "pure", 0, 0, true, false, false, handle_pure_attribute }, |
| { "no vops", 0, 0, true, false, false, handle_novops_attribute }, |
| { "nonnull", 0, -1, false, true, true, handle_nonnull_attribute }, |
| { "sentinel", 0, 1, false, true, true, handle_sentinel_attribute }, |
| { "noreturn", 0, 0, true, false, false, handle_noreturn_attribute }, |
| { "malloc", 0, 0, true, false, false, handle_malloc_attribute }, |
| { "type generic", 0, 0, false, true, true, handle_type_generic_attribute }, |
| |
| /* ??? format and format_arg are heavy and not supported, which actually |
| prevents support for stdio builtins, which we however declare as part |
| of the common builtins.def contents. */ |
| { "format", 3, 3, false, true, true, fake_attribute_handler }, |
| { "format_arg", 1, 1, false, true, true, fake_attribute_handler }, |
| |
| { NULL, 0, 0, false, false, false, NULL } |
| }; |
| |
| /* Associates a GNAT tree node to a GCC tree node. It is used in |
| `save_gnu_tree', `get_gnu_tree' and `present_gnu_tree'. See documentation |
| of `save_gnu_tree' for more info. */ |
| static GTY((length ("max_gnat_nodes"))) tree *associate_gnat_to_gnu; |
| |
| #define GET_GNU_TREE(GNAT_ENTITY) \ |
| associate_gnat_to_gnu[(GNAT_ENTITY) - First_Node_Id] |
| |
| #define SET_GNU_TREE(GNAT_ENTITY,VAL) \ |
| associate_gnat_to_gnu[(GNAT_ENTITY) - First_Node_Id] = (VAL) |
| |
| #define PRESENT_GNU_TREE(GNAT_ENTITY) \ |
| (associate_gnat_to_gnu[(GNAT_ENTITY) - First_Node_Id] != NULL_TREE) |
| |
| /* Associates a GNAT entity to a GCC tree node used as a dummy, if any. */ |
| static GTY((length ("max_gnat_nodes"))) tree *dummy_node_table; |
| |
| #define GET_DUMMY_NODE(GNAT_ENTITY) \ |
| dummy_node_table[(GNAT_ENTITY) - First_Node_Id] |
| |
| #define SET_DUMMY_NODE(GNAT_ENTITY,VAL) \ |
| dummy_node_table[(GNAT_ENTITY) - First_Node_Id] = (VAL) |
| |
| #define PRESENT_DUMMY_NODE(GNAT_ENTITY) \ |
| (dummy_node_table[(GNAT_ENTITY) - First_Node_Id] != NULL_TREE) |
| |
| /* This variable keeps a table for types for each precision so that we only |
| allocate each of them once. Signed and unsigned types are kept separate. |
| |
| Note that these types are only used when fold-const requests something |
| special. Perhaps we should NOT share these types; we'll see how it |
| goes later. */ |
| static GTY(()) tree signed_and_unsigned_types[2 * MAX_BITS_PER_WORD + 1][2]; |
| |
| /* Likewise for float types, but record these by mode. */ |
| static GTY(()) tree float_types[NUM_MACHINE_MODES]; |
| |
| /* For each binding contour we allocate a binding_level structure to indicate |
| the binding depth. */ |
| |
| struct gnat_binding_level GTY((chain_next ("%h.chain"))) |
| { |
| /* The binding level containing this one (the enclosing binding level). */ |
| struct gnat_binding_level *chain; |
| /* The BLOCK node for this level. */ |
| tree block; |
| /* If nonzero, the setjmp buffer that needs to be updated for any |
| variable-sized definition within this context. */ |
| tree jmpbuf_decl; |
| }; |
| |
| /* The binding level currently in effect. */ |
| static GTY(()) struct gnat_binding_level *current_binding_level; |
| |
| /* A chain of gnat_binding_level structures awaiting reuse. */ |
| static GTY((deletable)) struct gnat_binding_level *free_binding_level; |
| |
| /* An array of global declarations. */ |
| static GTY(()) VEC(tree,gc) *global_decls; |
| |
| /* An array of builtin function declarations. */ |
| static GTY(()) VEC(tree,gc) *builtin_decls; |
| |
| /* An array of global renaming pointers. */ |
| static GTY(()) VEC(tree,gc) *global_renaming_pointers; |
| |
| /* A chain of unused BLOCK nodes. */ |
| static GTY((deletable)) tree free_block_chain; |
| |
| static void gnat_install_builtins (void); |
| static tree merge_sizes (tree, tree, tree, bool, bool); |
| static tree compute_related_constant (tree, tree); |
| static tree split_plus (tree, tree *); |
| static void gnat_gimplify_function (tree); |
| static tree float_type_for_precision (int, enum machine_mode); |
| static tree convert_to_fat_pointer (tree, tree); |
| static tree convert_to_thin_pointer (tree, tree); |
| static tree make_descriptor_field (const char *,tree, tree, tree); |
| static bool potential_alignment_gap (tree, tree, tree); |
| |
| /* Initialize the association of GNAT nodes to GCC trees. */ |
| |
| void |
| init_gnat_to_gnu (void) |
| { |
| associate_gnat_to_gnu |
| = (tree *) ggc_alloc_cleared (max_gnat_nodes * sizeof (tree)); |
| } |
| |
| /* GNAT_ENTITY is a GNAT tree node for an entity. GNU_DECL is the GCC tree |
| which is to be associated with GNAT_ENTITY. Such GCC tree node is always |
| a ..._DECL node. If NO_CHECK is nonzero, the latter check is suppressed. |
| |
| If GNU_DECL is zero, a previous association is to be reset. */ |
| |
| void |
| save_gnu_tree (Entity_Id gnat_entity, tree gnu_decl, bool no_check) |
| { |
| /* Check that GNAT_ENTITY is not already defined and that it is being set |
| to something which is a decl. Raise gigi 401 if not. Usually, this |
| means GNAT_ENTITY is defined twice, but occasionally is due to some |
| Gigi problem. */ |
| gcc_assert (!(gnu_decl |
| && (PRESENT_GNU_TREE (gnat_entity) |
| || (!no_check && !DECL_P (gnu_decl))))); |
| |
| SET_GNU_TREE (gnat_entity, gnu_decl); |
| } |
| |
| /* GNAT_ENTITY is a GNAT tree node for a defining identifier. |
| Return the ..._DECL node that was associated with it. If there is no tree |
| node associated with GNAT_ENTITY, abort. |
| |
| In some cases, such as delayed elaboration or expressions that need to |
| be elaborated only once, GNAT_ENTITY is really not an entity. */ |
| |
| tree |
| get_gnu_tree (Entity_Id gnat_entity) |
| { |
| gcc_assert (PRESENT_GNU_TREE (gnat_entity)); |
| return GET_GNU_TREE (gnat_entity); |
| } |
| |
| /* Return nonzero if a GCC tree has been associated with GNAT_ENTITY. */ |
| |
| bool |
| present_gnu_tree (Entity_Id gnat_entity) |
| { |
| return PRESENT_GNU_TREE (gnat_entity); |
| } |
| |
| /* Initialize the association of GNAT nodes to GCC trees as dummies. */ |
| |
| void |
| init_dummy_type (void) |
| { |
| dummy_node_table |
| = (tree *) ggc_alloc_cleared (max_gnat_nodes * sizeof (tree)); |
| } |
| |
| /* Make a dummy type corresponding to GNAT_TYPE. */ |
| |
| tree |
| make_dummy_type (Entity_Id gnat_type) |
| { |
| Entity_Id gnat_underlying = Gigi_Equivalent_Type (gnat_type); |
| tree gnu_type; |
| |
| /* If there is an equivalent type, get its underlying type. */ |
| if (Present (gnat_underlying)) |
| gnat_underlying = Underlying_Type (gnat_underlying); |
| |
| /* If there was no equivalent type (can only happen when just annotating |
| types) or underlying type, go back to the original type. */ |
| if (No (gnat_underlying)) |
| gnat_underlying = gnat_type; |
| |
| /* If it there already a dummy type, use that one. Else make one. */ |
| if (PRESENT_DUMMY_NODE (gnat_underlying)) |
| return GET_DUMMY_NODE (gnat_underlying); |
| |
| /* If this is a record, make a RECORD_TYPE or UNION_TYPE; else make |
| an ENUMERAL_TYPE. */ |
| gnu_type = make_node (Is_Record_Type (gnat_underlying) |
| ? tree_code_for_record_type (gnat_underlying) |
| : ENUMERAL_TYPE); |
| TYPE_NAME (gnu_type) = get_entity_name (gnat_type); |
| TYPE_DUMMY_P (gnu_type) = 1; |
| if (AGGREGATE_TYPE_P (gnu_type)) |
| { |
| TYPE_STUB_DECL (gnu_type) = build_decl (TYPE_DECL, NULL_TREE, gnu_type); |
| TYPE_BY_REFERENCE_P (gnu_type) = Is_By_Reference_Type (gnat_type); |
| } |
| |
| SET_DUMMY_NODE (gnat_underlying, gnu_type); |
| |
| return gnu_type; |
| } |
| |
| /* Return nonzero if we are currently in the global binding level. */ |
| |
| int |
| global_bindings_p (void) |
| { |
| return ((force_global || !current_function_decl) ? -1 : 0); |
| } |
| |
| /* Enter a new binding level. */ |
| |
| void |
| gnat_pushlevel () |
| { |
| struct gnat_binding_level *newlevel = NULL; |
| |
| /* Reuse a struct for this binding level, if there is one. */ |
| if (free_binding_level) |
| { |
| newlevel = free_binding_level; |
| free_binding_level = free_binding_level->chain; |
| } |
| else |
| newlevel |
| = (struct gnat_binding_level *) |
| ggc_alloc (sizeof (struct gnat_binding_level)); |
| |
| /* Use a free BLOCK, if any; otherwise, allocate one. */ |
| if (free_block_chain) |
| { |
| newlevel->block = free_block_chain; |
| free_block_chain = BLOCK_CHAIN (free_block_chain); |
| BLOCK_CHAIN (newlevel->block) = NULL_TREE; |
| } |
| else |
| newlevel->block = make_node (BLOCK); |
| |
| /* Point the BLOCK we just made to its parent. */ |
| if (current_binding_level) |
| BLOCK_SUPERCONTEXT (newlevel->block) = current_binding_level->block; |
| |
| BLOCK_VARS (newlevel->block) = BLOCK_SUBBLOCKS (newlevel->block) = NULL_TREE; |
| TREE_USED (newlevel->block) = 1; |
| |
| /* Add this level to the front of the chain (stack) of levels that are |
| active. */ |
| newlevel->chain = current_binding_level; |
| newlevel->jmpbuf_decl = NULL_TREE; |
| current_binding_level = newlevel; |
| } |
| |
| /* Set SUPERCONTEXT of the BLOCK for the current binding level to FNDECL |
| and point FNDECL to this BLOCK. */ |
| |
| void |
| set_current_block_context (tree fndecl) |
| { |
| BLOCK_SUPERCONTEXT (current_binding_level->block) = fndecl; |
| DECL_INITIAL (fndecl) = current_binding_level->block; |
| } |
| |
| /* Set the jmpbuf_decl for the current binding level to DECL. */ |
| |
| void |
| set_block_jmpbuf_decl (tree decl) |
| { |
| current_binding_level->jmpbuf_decl = decl; |
| } |
| |
| /* Get the jmpbuf_decl, if any, for the current binding level. */ |
| |
| tree |
| get_block_jmpbuf_decl () |
| { |
| return current_binding_level->jmpbuf_decl; |
| } |
| |
| /* Exit a binding level. Set any BLOCK into the current code group. */ |
| |
| void |
| gnat_poplevel () |
| { |
| struct gnat_binding_level *level = current_binding_level; |
| tree block = level->block; |
| |
| BLOCK_VARS (block) = nreverse (BLOCK_VARS (block)); |
| BLOCK_SUBBLOCKS (block) = nreverse (BLOCK_SUBBLOCKS (block)); |
| |
| /* If this is a function-level BLOCK don't do anything. Otherwise, if there |
| are no variables free the block and merge its subblocks into those of its |
| parent block. Otherwise, add it to the list of its parent. */ |
| if (TREE_CODE (BLOCK_SUPERCONTEXT (block)) == FUNCTION_DECL) |
| ; |
| else if (BLOCK_VARS (block) == NULL_TREE) |
| { |
| BLOCK_SUBBLOCKS (level->chain->block) |
| = chainon (BLOCK_SUBBLOCKS (block), |
| BLOCK_SUBBLOCKS (level->chain->block)); |
| BLOCK_CHAIN (block) = free_block_chain; |
| free_block_chain = block; |
| } |
| else |
| { |
| BLOCK_CHAIN (block) = BLOCK_SUBBLOCKS (level->chain->block); |
| BLOCK_SUBBLOCKS (level->chain->block) = block; |
| TREE_USED (block) = 1; |
| set_block_for_group (block); |
| } |
| |
| /* Free this binding structure. */ |
| current_binding_level = level->chain; |
| level->chain = free_binding_level; |
| free_binding_level = level; |
| } |
| |
| |
| /* Records a ..._DECL node DECL as belonging to the current lexical scope |
| and uses GNAT_NODE for location information and propagating flags. */ |
| |
| void |
| gnat_pushdecl (tree decl, Node_Id gnat_node) |
| { |
| /* If this decl is public external or at toplevel, there is no context. |
| But PARM_DECLs always go in the level of its function. */ |
| if (TREE_CODE (decl) != PARM_DECL |
| && ((DECL_EXTERNAL (decl) && TREE_PUBLIC (decl)) |
| || global_bindings_p ())) |
| DECL_CONTEXT (decl) = 0; |
| else |
| { |
| DECL_CONTEXT (decl) = current_function_decl; |
| |
| /* Functions imported in another function are not really nested. */ |
| if (TREE_CODE (decl) == FUNCTION_DECL && TREE_PUBLIC (decl)) |
| DECL_NO_STATIC_CHAIN (decl) = 1; |
| } |
| |
| TREE_NO_WARNING (decl) = (gnat_node == Empty || Warnings_Off (gnat_node)); |
| |
| /* Set the location of DECL and emit a declaration for it. */ |
| if (Present (gnat_node)) |
| Sloc_to_locus (Sloc (gnat_node), &DECL_SOURCE_LOCATION (decl)); |
| add_decl_expr (decl, gnat_node); |
| |
| /* Put the declaration on the list. The list of declarations is in reverse |
| order. The list will be reversed later. Put global variables in the |
| globals list and builtin functions in a dedicated list to speed up |
| further lookups. Don't put TYPE_DECLs for UNCONSTRAINED_ARRAY_TYPE into |
| the list, as they will cause trouble with the debugger and aren't needed |
| anyway. */ |
| if (TREE_CODE (decl) != TYPE_DECL |
| || TREE_CODE (TREE_TYPE (decl)) != UNCONSTRAINED_ARRAY_TYPE) |
| { |
| if (global_bindings_p ()) |
| { |
| VEC_safe_push (tree, gc, global_decls, decl); |
| |
| if (TREE_CODE (decl) == FUNCTION_DECL && DECL_BUILT_IN (decl)) |
| VEC_safe_push (tree, gc, builtin_decls, decl); |
| } |
| else |
| { |
| TREE_CHAIN (decl) = BLOCK_VARS (current_binding_level->block); |
| BLOCK_VARS (current_binding_level->block) = decl; |
| } |
| } |
| |
| /* For the declaration of a type, set its name if it either is not already |
| set, was set to an IDENTIFIER_NODE, indicating an internal name, |
| or if the previous type name was not derived from a source name. |
| We'd rather have the type named with a real name and all the pointer |
| types to the same object have the same POINTER_TYPE node. Code in the |
| equivalent function of c-decl.c makes a copy of the type node here, but |
| that may cause us trouble with incomplete types. We make an exception |
| for fat pointer types because the compiler automatically builds them |
| for unconstrained array types and the debugger uses them to represent |
| both these and pointers to these. */ |
| if (TREE_CODE (decl) == TYPE_DECL && DECL_NAME (decl)) |
| { |
| tree t = TREE_TYPE (decl); |
| |
| if (!TYPE_NAME (t) || TREE_CODE (TYPE_NAME (t)) == IDENTIFIER_NODE) |
| ; |
| else if (TYPE_FAT_POINTER_P (t)) |
| { |
| tree tt = build_variant_type_copy (t); |
| TYPE_NAME (tt) = decl; |
| TREE_USED (tt) = TREE_USED (t); |
| TREE_TYPE (decl) = tt; |
| DECL_ORIGINAL_TYPE (decl) = t; |
| t = NULL_TREE; |
| } |
| else if (DECL_ARTIFICIAL (TYPE_NAME (t)) && !DECL_ARTIFICIAL (decl)) |
| ; |
| else |
| t = NULL_TREE; |
| |
| /* Propagate the name to all the variants. This is needed for |
| the type qualifiers machinery to work properly. */ |
| if (t) |
| for (t = TYPE_MAIN_VARIANT (t); t; t = TYPE_NEXT_VARIANT (t)) |
| TYPE_NAME (t) = decl; |
| } |
| } |
| |
| /* Do little here. Set up the standard declarations later after the |
| front end has been run. */ |
| |
| void |
| gnat_init_decl_processing (void) |
| { |
| /* Make the binding_level structure for global names. */ |
| current_function_decl = 0; |
| current_binding_level = 0; |
| free_binding_level = 0; |
| gnat_pushlevel (); |
| |
| build_common_tree_nodes (true, true); |
| |
| /* In Ada, we use a signed type for SIZETYPE. Use the signed type |
| corresponding to the size of Pmode. In most cases when ptr_mode and |
| Pmode differ, C will use the width of ptr_mode as sizetype. But we get |
| far better code using the width of Pmode. Make this here since we need |
| this before we can expand the GNAT types. */ |
| size_type_node = gnat_type_for_size (GET_MODE_BITSIZE (Pmode), 0); |
| set_sizetype (size_type_node); |
| |
| /* In Ada, we use an unsigned 8-bit type for the default boolean type. */ |
| boolean_type_node = make_node (BOOLEAN_TYPE); |
| TYPE_PRECISION (boolean_type_node) = 1; |
| fixup_unsigned_type (boolean_type_node); |
| TYPE_RM_SIZE_NUM (boolean_type_node) = bitsize_int (1); |
| |
| build_common_tree_nodes_2 (0); |
| |
| ptr_void_type_node = build_pointer_type (void_type_node); |
| } |
| |
| /* Create the predefined scalar types such as `integer_type_node' needed |
| in the gcc back-end and initialize the global binding level. */ |
| |
| void |
| init_gigi_decls (tree long_long_float_type, tree exception_type) |
| { |
| tree endlink, decl; |
| tree int64_type = gnat_type_for_size (64, 0); |
| unsigned int i; |
| |
| /* Set the types that GCC and Gigi use from the front end. We would like |
| to do this for char_type_node, but it needs to correspond to the C |
| char type. */ |
| if (TREE_CODE (TREE_TYPE (long_long_float_type)) == INTEGER_TYPE) |
| { |
| /* In this case, the builtin floating point types are VAX float, |
| so make up a type for use. */ |
| longest_float_type_node = make_node (REAL_TYPE); |
| TYPE_PRECISION (longest_float_type_node) = LONG_DOUBLE_TYPE_SIZE; |
| layout_type (longest_float_type_node); |
| create_type_decl (get_identifier ("longest float type"), |
| longest_float_type_node, NULL, false, true, Empty); |
| } |
| else |
| longest_float_type_node = TREE_TYPE (long_long_float_type); |
| |
| except_type_node = TREE_TYPE (exception_type); |
| |
| unsigned_type_node = gnat_type_for_size (INT_TYPE_SIZE, 1); |
| create_type_decl (get_identifier ("unsigned int"), unsigned_type_node, |
| NULL, false, true, Empty); |
| |
| void_type_decl_node = create_type_decl (get_identifier ("void"), |
| void_type_node, NULL, false, true, |
| Empty); |
| |
| void_ftype = build_function_type (void_type_node, NULL_TREE); |
| ptr_void_ftype = build_pointer_type (void_ftype); |
| |
| /* Build the special descriptor type and its null node if needed. */ |
| if (TARGET_VTABLE_USES_DESCRIPTORS) |
| { |
| tree null_node = fold_convert (ptr_void_ftype, null_pointer_node); |
| tree field_list = NULL_TREE, null_list = NULL_TREE; |
| int j; |
| |
| fdesc_type_node = make_node (RECORD_TYPE); |
| |
| for (j = 0; j < TARGET_VTABLE_USES_DESCRIPTORS; j++) |
| { |
| tree field = create_field_decl (NULL_TREE, ptr_void_ftype, |
| fdesc_type_node, 0, 0, 0, 1); |
| TREE_CHAIN (field) = field_list; |
| field_list = field; |
| null_list = tree_cons (field, null_node, null_list); |
| } |
| |
| finish_record_type (fdesc_type_node, nreverse (field_list), 0, false); |
| null_fdesc_node = gnat_build_constructor (fdesc_type_node, null_list); |
| } |
| |
| /* Now declare runtime functions. */ |
| endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE); |
| |
| /* malloc is a function declaration tree for a function to allocate |
| memory. */ |
| malloc_decl = create_subprog_decl (get_identifier ("__gnat_malloc"), |
| NULL_TREE, |
| build_function_type (ptr_void_type_node, |
| tree_cons (NULL_TREE, |
| sizetype, |
| endlink)), |
| NULL_TREE, false, true, true, NULL, |
| Empty); |
| DECL_IS_MALLOC (malloc_decl) = 1; |
| |
| /* malloc32 is a function declaration tree for a function to allocate |
| 32bit memory on a 64bit system. Needed only on 64bit VMS. */ |
| malloc32_decl = create_subprog_decl (get_identifier ("__gnat_malloc32"), |
| NULL_TREE, |
| build_function_type (ptr_void_type_node, |
| tree_cons (NULL_TREE, |
| sizetype, |
| endlink)), |
| NULL_TREE, false, true, true, NULL, |
| Empty); |
| DECL_IS_MALLOC (malloc32_decl) = 1; |
| |
| /* free is a function declaration tree for a function to free memory. */ |
| free_decl |
| = create_subprog_decl (get_identifier ("__gnat_free"), NULL_TREE, |
| build_function_type (void_type_node, |
| tree_cons (NULL_TREE, |
| ptr_void_type_node, |
| endlink)), |
| NULL_TREE, false, true, true, NULL, Empty); |
| |
| /* This is used for 64-bit multiplication with overflow checking. */ |
| mulv64_decl |
| = create_subprog_decl (get_identifier ("__gnat_mulv64"), NULL_TREE, |
| build_function_type_list (int64_type, int64_type, |
| int64_type, NULL_TREE), |
| NULL_TREE, false, true, true, NULL, Empty); |
| |
| /* Make the types and functions used for exception processing. */ |
| jmpbuf_type |
| = build_array_type (gnat_type_for_mode (Pmode, 0), |
| build_index_type (build_int_cst (NULL_TREE, 5))); |
| create_type_decl (get_identifier ("JMPBUF_T"), jmpbuf_type, NULL, |
| true, true, Empty); |
| jmpbuf_ptr_type = build_pointer_type (jmpbuf_type); |
| |
| /* Functions to get and set the jumpbuf pointer for the current thread. */ |
| get_jmpbuf_decl |
| = create_subprog_decl |
| (get_identifier ("system__soft_links__get_jmpbuf_address_soft"), |
| NULL_TREE, build_function_type (jmpbuf_ptr_type, NULL_TREE), |
| NULL_TREE, false, true, true, NULL, Empty); |
| /* Avoid creating superfluous edges to __builtin_setjmp receivers. */ |
| DECL_PURE_P (get_jmpbuf_decl) = 1; |
| |
| set_jmpbuf_decl |
| = create_subprog_decl |
| (get_identifier ("system__soft_links__set_jmpbuf_address_soft"), |
| NULL_TREE, |
| build_function_type (void_type_node, |
| tree_cons (NULL_TREE, jmpbuf_ptr_type, endlink)), |
| NULL_TREE, false, true, true, NULL, Empty); |
| |
| /* Function to get the current exception. */ |
| get_excptr_decl |
| = create_subprog_decl |
| (get_identifier ("system__soft_links__get_gnat_exception"), |
| NULL_TREE, |
| build_function_type (build_pointer_type (except_type_node), NULL_TREE), |
| NULL_TREE, false, true, true, NULL, Empty); |
| /* Avoid creating superfluous edges to __builtin_setjmp receivers. */ |
| DECL_PURE_P (get_excptr_decl) = 1; |
| |
| /* Functions that raise exceptions. */ |
| raise_nodefer_decl |
| = create_subprog_decl |
| (get_identifier ("__gnat_raise_nodefer_with_msg"), NULL_TREE, |
| build_function_type (void_type_node, |
| tree_cons (NULL_TREE, |
| build_pointer_type (except_type_node), |
| endlink)), |
| NULL_TREE, false, true, true, NULL, Empty); |
| |
| /* Dummy objects to materialize "others" and "all others" in the exception |
| tables. These are exported by a-exexpr.adb, so see this unit for the |
| types to use. */ |
| |
| others_decl |
| = create_var_decl (get_identifier ("OTHERS"), |
| get_identifier ("__gnat_others_value"), |
| integer_type_node, 0, 1, 0, 1, 1, 0, Empty); |
| |
| all_others_decl |
| = create_var_decl (get_identifier ("ALL_OTHERS"), |
| get_identifier ("__gnat_all_others_value"), |
| integer_type_node, 0, 1, 0, 1, 1, 0, Empty); |
| |
| /* Hooks to call when entering/leaving an exception handler. */ |
| begin_handler_decl |
| = create_subprog_decl (get_identifier ("__gnat_begin_handler"), NULL_TREE, |
| build_function_type (void_type_node, |
| tree_cons (NULL_TREE, |
| ptr_void_type_node, |
| endlink)), |
| NULL_TREE, false, true, true, NULL, Empty); |
| |
| end_handler_decl |
| = create_subprog_decl (get_identifier ("__gnat_end_handler"), NULL_TREE, |
| build_function_type (void_type_node, |
| tree_cons (NULL_TREE, |
| ptr_void_type_node, |
| endlink)), |
| NULL_TREE, false, true, true, NULL, Empty); |
| |
| /* If in no exception handlers mode, all raise statements are redirected to |
| __gnat_last_chance_handler. No need to redefine raise_nodefer_decl, since |
| this procedure will never be called in this mode. */ |
| if (No_Exception_Handlers_Set ()) |
| { |
| decl |
| = create_subprog_decl |
| (get_identifier ("__gnat_last_chance_handler"), NULL_TREE, |
| build_function_type (void_type_node, |
| tree_cons (NULL_TREE, |
| build_pointer_type (char_type_node), |
| tree_cons (NULL_TREE, |
| integer_type_node, |
| endlink))), |
| NULL_TREE, false, true, true, NULL, Empty); |
| |
| for (i = 0; i < ARRAY_SIZE (gnat_raise_decls); i++) |
| gnat_raise_decls[i] = decl; |
| } |
| else |
| /* Otherwise, make one decl for each exception reason. */ |
| for (i = 0; i < ARRAY_SIZE (gnat_raise_decls); i++) |
| { |
| char name[17]; |
| |
| sprintf (name, "__gnat_rcheck_%.2d", i); |
| gnat_raise_decls[i] |
| = create_subprog_decl |
| (get_identifier (name), NULL_TREE, |
| build_function_type (void_type_node, |
| tree_cons (NULL_TREE, |
| build_pointer_type |
| (char_type_node), |
| tree_cons (NULL_TREE, |
| integer_type_node, |
| endlink))), |
| NULL_TREE, false, true, true, NULL, Empty); |
| } |
| |
| /* Indicate that these never return. */ |
| TREE_THIS_VOLATILE (raise_nodefer_decl) = 1; |
| TREE_SIDE_EFFECTS (raise_nodefer_decl) = 1; |
| TREE_TYPE (raise_nodefer_decl) |
| = build_qualified_type (TREE_TYPE (raise_nodefer_decl), |
| TYPE_QUAL_VOLATILE); |
| |
| for (i = 0; i < ARRAY_SIZE (gnat_raise_decls); i++) |
| { |
| TREE_THIS_VOLATILE (gnat_raise_decls[i]) = 1; |
| TREE_SIDE_EFFECTS (gnat_raise_decls[i]) = 1; |
| TREE_TYPE (gnat_raise_decls[i]) |
| = build_qualified_type (TREE_TYPE (gnat_raise_decls[i]), |
| TYPE_QUAL_VOLATILE); |
| } |
| |
| /* setjmp returns an integer and has one operand, which is a pointer to |
| a jmpbuf. */ |
| setjmp_decl |
| = create_subprog_decl |
| (get_identifier ("__builtin_setjmp"), NULL_TREE, |
| build_function_type (integer_type_node, |
| tree_cons (NULL_TREE, jmpbuf_ptr_type, endlink)), |
| NULL_TREE, false, true, true, NULL, Empty); |
| |
| DECL_BUILT_IN_CLASS (setjmp_decl) = BUILT_IN_NORMAL; |
| DECL_FUNCTION_CODE (setjmp_decl) = BUILT_IN_SETJMP; |
| |
| /* update_setjmp_buf updates a setjmp buffer from the current stack pointer |
| address. */ |
| update_setjmp_buf_decl |
| = create_subprog_decl |
| (get_identifier ("__builtin_update_setjmp_buf"), NULL_TREE, |
| build_function_type (void_type_node, |
| tree_cons (NULL_TREE, jmpbuf_ptr_type, endlink)), |
| NULL_TREE, false, true, true, NULL, Empty); |
| |
| DECL_BUILT_IN_CLASS (update_setjmp_buf_decl) = BUILT_IN_NORMAL; |
| DECL_FUNCTION_CODE (update_setjmp_buf_decl) = BUILT_IN_UPDATE_SETJMP_BUF; |
| |
| main_identifier_node = get_identifier ("main"); |
| |
| /* Install the builtins we might need, either internally or as |
| user available facilities for Intrinsic imports. */ |
| gnat_install_builtins (); |
| } |
| |
| /* Given a record type RECORD_TYPE and a chain of FIELD_DECL nodes FIELDLIST, |
| finish constructing the record or union type. If REP_LEVEL is zero, this |
| record has no representation clause and so will be entirely laid out here. |
| If REP_LEVEL is one, this record has a representation clause and has been |
| laid out already; only set the sizes and alignment. If REP_LEVEL is two, |
| this record is derived from a parent record and thus inherits its layout; |
| only make a pass on the fields to finalize them. If DO_NOT_FINALIZE is |
| true, the record type is expected to be modified afterwards so it will |
| not be sent to the back-end for finalization. */ |
| |
| void |
| finish_record_type (tree record_type, tree fieldlist, int rep_level, |
| bool do_not_finalize) |
| { |
| enum tree_code code = TREE_CODE (record_type); |
| tree name = TYPE_NAME (record_type); |
| tree ada_size = bitsize_zero_node; |
| tree size = bitsize_zero_node; |
| bool had_size = TYPE_SIZE (record_type) != 0; |
| bool had_size_unit = TYPE_SIZE_UNIT (record_type) != 0; |
| bool had_align = TYPE_ALIGN (record_type) != 0; |
| tree field; |
| |
| if (name && TREE_CODE (name) == TYPE_DECL) |
| name = DECL_NAME (name); |
| |
| TYPE_FIELDS (record_type) = fieldlist; |
| TYPE_STUB_DECL (record_type) = build_decl (TYPE_DECL, name, record_type); |
| |
| /* We don't need both the typedef name and the record name output in |
| the debugging information, since they are the same. */ |
| DECL_ARTIFICIAL (TYPE_STUB_DECL (record_type)) = 1; |
| |
| /* Globally initialize the record first. If this is a rep'ed record, |
| that just means some initializations; otherwise, layout the record. */ |
| if (rep_level > 0) |
| { |
| TYPE_ALIGN (record_type) = MAX (BITS_PER_UNIT, TYPE_ALIGN (record_type)); |
| SET_TYPE_MODE (record_type, BLKmode); |
| |
| if (!had_size_unit) |
| TYPE_SIZE_UNIT (record_type) = size_zero_node; |
| if (!had_size) |
| TYPE_SIZE (record_type) = bitsize_zero_node; |
| |
| /* For all-repped records with a size specified, lay the QUAL_UNION_TYPE |
| out just like a UNION_TYPE, since the size will be fixed. */ |
| else if (code == QUAL_UNION_TYPE) |
| code = UNION_TYPE; |
| } |
| else |
| { |
| /* Ensure there isn't a size already set. There can be in an error |
| case where there is a rep clause but all fields have errors and |
| no longer have a position. */ |
| TYPE_SIZE (record_type) = 0; |
| layout_type (record_type); |
| } |
| |
| /* At this point, the position and size of each field is known. It was |
| either set before entry by a rep clause, or by laying out the type above. |
| |
| We now run a pass over the fields (in reverse order for QUAL_UNION_TYPEs) |
| to compute the Ada size; the GCC size and alignment (for rep'ed records |
| that are not padding types); and the mode (for rep'ed records). We also |
| clear the DECL_BIT_FIELD indication for the cases we know have not been |
| handled yet, and adjust DECL_NONADDRESSABLE_P accordingly. */ |
| |
| if (code == QUAL_UNION_TYPE) |
| fieldlist = nreverse (fieldlist); |
| |
| for (field = fieldlist; field; field = TREE_CHAIN (field)) |
| { |
| tree type = TREE_TYPE (field); |
| tree pos = bit_position (field); |
| tree this_size = DECL_SIZE (field); |
| tree this_ada_size; |
| |
| if ((TREE_CODE (type) == RECORD_TYPE |
| || TREE_CODE (type) == UNION_TYPE |
| || TREE_CODE (type) == QUAL_UNION_TYPE) |
| && !TYPE_IS_FAT_POINTER_P (type) |
| && !TYPE_CONTAINS_TEMPLATE_P (type) |
| && TYPE_ADA_SIZE (type)) |
| this_ada_size = TYPE_ADA_SIZE (type); |
| else |
| this_ada_size = this_size; |
| |
| /* Clear DECL_BIT_FIELD for the cases layout_decl does not handle. */ |
| if (DECL_BIT_FIELD (field) |
| && operand_equal_p (this_size, TYPE_SIZE (type), 0)) |
| { |
| unsigned int align = TYPE_ALIGN (type); |
| |
| /* In the general case, type alignment is required. */ |
| if (value_factor_p (pos, align)) |
| { |
| /* The enclosing record type must be sufficiently aligned. |
| Otherwise, if no alignment was specified for it and it |
| has been laid out already, bump its alignment to the |
| desired one if this is compatible with its size. */ |
| if (TYPE_ALIGN (record_type) >= align) |
| { |
| DECL_ALIGN (field) = MAX (DECL_ALIGN (field), align); |
| DECL_BIT_FIELD (field) = 0; |
| } |
| else if (!had_align |
| && rep_level == 0 |
| && value_factor_p (TYPE_SIZE (record_type), align)) |
| { |
| TYPE_ALIGN (record_type) = align; |
| DECL_ALIGN (field) = MAX (DECL_ALIGN (field), align); |
| DECL_BIT_FIELD (field) = 0; |
| } |
| } |
| |
| /* In the non-strict alignment case, only byte alignment is. */ |
| if (!STRICT_ALIGNMENT |
| && DECL_BIT_FIELD (field) |
| && value_factor_p (pos, BITS_PER_UNIT)) |
| DECL_BIT_FIELD (field) = 0; |
| } |
| |
| /* If we still have DECL_BIT_FIELD set at this point, we know the field |
| is technically not addressable. Except that it can actually be |
| addressed if the field is BLKmode and happens to be properly |
| aligned. */ |
| DECL_NONADDRESSABLE_P (field) |
| |= DECL_BIT_FIELD (field) && DECL_MODE (field) != BLKmode; |
| |
| /* A type must be as aligned as its most aligned field that is not |
| a bit-field. But this is already enforced by layout_type. */ |
| if (rep_level > 0 && !DECL_BIT_FIELD (field)) |
| TYPE_ALIGN (record_type) |
| = MAX (TYPE_ALIGN (record_type), DECL_ALIGN (field)); |
| |
| switch (code) |
| { |
| case UNION_TYPE: |
| ada_size = size_binop (MAX_EXPR, ada_size, this_ada_size); |
| size = size_binop (MAX_EXPR, size, this_size); |
| break; |
| |
| case QUAL_UNION_TYPE: |
| ada_size |
| = fold_build3 (COND_EXPR, bitsizetype, DECL_QUALIFIER (field), |
| this_ada_size, ada_size); |
| size = fold_build3 (COND_EXPR, bitsizetype, DECL_QUALIFIER (field), |
| this_size, size); |
| break; |
| |
| case RECORD_TYPE: |
| /* Since we know here that all fields are sorted in order of |
| increasing bit position, the size of the record is one |
| higher than the ending bit of the last field processed |
| unless we have a rep clause, since in that case we might |
| have a field outside a QUAL_UNION_TYPE that has a higher ending |
| position. So use a MAX in that case. Also, if this field is a |
| QUAL_UNION_TYPE, we need to take into account the previous size in |
| the case of empty variants. */ |
| ada_size |
| = merge_sizes (ada_size, pos, this_ada_size, |
| TREE_CODE (type) == QUAL_UNION_TYPE, rep_level > 0); |
| size |
| = merge_sizes (size, pos, this_size, |
| TREE_CODE (type) == QUAL_UNION_TYPE, rep_level > 0); |
| break; |
| |
| default: |
| gcc_unreachable (); |
| } |
| } |
| |
| if (code == QUAL_UNION_TYPE) |
| nreverse (fieldlist); |
| |
| if (rep_level < 2) |
| { |
| /* If this is a padding record, we never want to make the size smaller |
| than what was specified in it, if any. */ |
| if (TREE_CODE (record_type) == RECORD_TYPE |
| && TYPE_IS_PADDING_P (record_type) && TYPE_SIZE (record_type)) |
| size = TYPE_SIZE (record_type); |
| |
| /* Now set any of the values we've just computed that apply. */ |
| if (!TYPE_IS_FAT_POINTER_P (record_type) |
| && !TYPE_CONTAINS_TEMPLATE_P (record_type)) |
| SET_TYPE_ADA_SIZE (record_type, ada_size); |
| |
| if (rep_level > 0) |
| { |
| tree size_unit = had_size_unit |
| ? TYPE_SIZE_UNIT (record_type) |
| : convert (sizetype, |
| size_binop (CEIL_DIV_EXPR, size, |
| bitsize_unit_node)); |
| unsigned int align = TYPE_ALIGN (record_type); |
| |
| TYPE_SIZE (record_type) = variable_size (round_up (size, align)); |
| TYPE_SIZE_UNIT (record_type) |
| = variable_size (round_up (size_unit, align / BITS_PER_UNIT)); |
| |
| compute_record_mode (record_type); |
| } |
| } |
| |
| if (!do_not_finalize) |
| rest_of_record_type_compilation (record_type); |
| } |
| |
| /* Wrap up compilation of RECORD_TYPE, i.e. most notably output all |
| the debug information associated with it. It need not be invoked |
| directly in most cases since finish_record_type takes care of doing |
| so, unless explicitly requested not to through DO_NOT_FINALIZE. */ |
| |
| void |
| rest_of_record_type_compilation (tree record_type) |
| { |
| tree fieldlist = TYPE_FIELDS (record_type); |
| tree field; |
| enum tree_code code = TREE_CODE (record_type); |
| bool var_size = false; |
| |
| for (field = fieldlist; field; field = TREE_CHAIN (field)) |
| { |
| /* We need to make an XVE/XVU record if any field has variable size, |
| whether or not the record does. For example, if we have a union, |
| it may be that all fields, rounded up to the alignment, have the |
| same size, in which case we'll use that size. But the debug |
| output routines (except Dwarf2) won't be able to output the fields, |
| so we need to make the special record. */ |
| if (TREE_CODE (DECL_SIZE (field)) != INTEGER_CST |
| /* If a field has a non-constant qualifier, the record will have |
| variable size too. */ |
| || (code == QUAL_UNION_TYPE |
| && TREE_CODE (DECL_QUALIFIER (field)) != INTEGER_CST)) |
| { |
| var_size = true; |
| break; |
| } |
| } |
| |
| /* If this record is of variable size, rename it so that the |
| debugger knows it is and make a new, parallel, record |
| that tells the debugger how the record is laid out. See |
| exp_dbug.ads. But don't do this for records that are padding |
| since they confuse GDB. */ |
| if (var_size |
| && !(TREE_CODE (record_type) == RECORD_TYPE |
| && TYPE_IS_PADDING_P (record_type))) |
| { |
| tree new_record_type |
| = make_node (TREE_CODE (record_type) == QUAL_UNION_TYPE |
| ? UNION_TYPE : TREE_CODE (record_type)); |
| tree orig_name = TYPE_NAME (record_type); |
| tree orig_id |
| = (TREE_CODE (orig_name) == TYPE_DECL ? DECL_NAME (orig_name) |
| : orig_name); |
| tree new_id |
| = concat_id_with_name (orig_id, |
| TREE_CODE (record_type) == QUAL_UNION_TYPE |
| ? "XVU" : "XVE"); |
| tree last_pos = bitsize_zero_node; |
| tree old_field; |
| tree prev_old_field = 0; |
| |
| TYPE_NAME (new_record_type) = new_id; |
| TYPE_ALIGN (new_record_type) = BIGGEST_ALIGNMENT; |
| TYPE_STUB_DECL (new_record_type) |
| = build_decl (TYPE_DECL, new_id, new_record_type); |
| DECL_ARTIFICIAL (TYPE_STUB_DECL (new_record_type)) = 1; |
| DECL_IGNORED_P (TYPE_STUB_DECL (new_record_type)) |
| = DECL_IGNORED_P (TYPE_STUB_DECL (record_type)); |
| TYPE_SIZE (new_record_type) = size_int (TYPE_ALIGN (record_type)); |
| TYPE_SIZE_UNIT (new_record_type) |
| = size_int (TYPE_ALIGN (record_type) / BITS_PER_UNIT); |
| |
| add_parallel_type (TYPE_STUB_DECL (record_type), new_record_type); |
| |
| /* Now scan all the fields, replacing each field with a new |
| field corresponding to the new encoding. */ |
| for (old_field = TYPE_FIELDS (record_type); old_field; |
| old_field = TREE_CHAIN (old_field)) |
| { |
| tree field_type = TREE_TYPE (old_field); |
| tree field_name = DECL_NAME (old_field); |
| tree new_field; |
| tree curpos = bit_position (old_field); |
| bool var = false; |
| unsigned int align = 0; |
| tree pos; |
| |
| /* See how the position was modified from the last position. |
| |
| There are two basic cases we support: a value was added |
| to the last position or the last position was rounded to |
| a boundary and they something was added. Check for the |
| first case first. If not, see if there is any evidence |
| of rounding. If so, round the last position and try |
| again. |
| |
| If this is a union, the position can be taken as zero. */ |
| |
| /* Some computations depend on the shape of the position expression, |
| so strip conversions to make sure it's exposed. */ |
| curpos = remove_conversions (curpos, true); |
| |
| if (TREE_CODE (new_record_type) == UNION_TYPE) |
| pos = bitsize_zero_node, align = 0; |
| else |
| pos = compute_related_constant (curpos, last_pos); |
| |
| if (!pos && TREE_CODE (curpos) == MULT_EXPR |
| && host_integerp (TREE_OPERAND (curpos, 1), 1)) |
| { |
| tree offset = TREE_OPERAND (curpos, 0); |
| align = tree_low_cst (TREE_OPERAND (curpos, 1), 1); |
| |
| /* An offset which is a bitwise AND with a negative power of 2 |
| means an alignment corresponding to this power of 2. */ |
| offset = remove_conversions (offset, true); |
| if (TREE_CODE (offset) == BIT_AND_EXPR |
| && host_integerp (TREE_OPERAND (offset, 1), 0) |
| && tree_int_cst_sgn (TREE_OPERAND (offset, 1)) < 0) |
| { |
| unsigned int pow |
| = - tree_low_cst (TREE_OPERAND (offset, 1), 0); |
| if (exact_log2 (pow) > 0) |
| align *= pow; |
| } |
| |
| pos = compute_related_constant (curpos, |
| round_up (last_pos, align)); |
| } |
| else if (!pos && TREE_CODE (curpos) == PLUS_EXPR |
| && TREE_CODE (TREE_OPERAND (curpos, 1)) == INTEGER_CST |
| && TREE_CODE (TREE_OPERAND (curpos, 0)) == MULT_EXPR |
| && host_integerp (TREE_OPERAND |
| (TREE_OPERAND (curpos, 0), 1), |
| 1)) |
| { |
| align |
| = tree_low_cst |
| (TREE_OPERAND (TREE_OPERAND (curpos, 0), 1), 1); |
| pos = compute_related_constant (curpos, |
| round_up (last_pos, align)); |
| } |
| else if (potential_alignment_gap (prev_old_field, old_field, |
| pos)) |
| { |
| align = TYPE_ALIGN (field_type); |
| pos = compute_related_constant (curpos, |
| round_up (last_pos, align)); |
| } |
| |
| /* If we can't compute a position, set it to zero. |
| |
| ??? We really should abort here, but it's too much work |
| to get this correct for all cases. */ |
| |
| if (!pos) |
| pos = bitsize_zero_node; |
| |
| /* See if this type is variable-sized and make a pointer type |
| and indicate the indirection if so. Beware that the debug |
| back-end may adjust the position computed above according |
| to the alignment of the field type, i.e. the pointer type |
| in this case, if we don't preventively counter that. */ |
| if (TREE_CODE (DECL_SIZE (old_field)) != INTEGER_CST) |
| { |
| field_type = build_pointer_type (field_type); |
| if (align != 0 && TYPE_ALIGN (field_type) > align) |
| { |
| field_type = copy_node (field_type); |
| TYPE_ALIGN (field_type) = align; |
| } |
| var = true; |
| } |
| |
| /* Make a new field name, if necessary. */ |
| if (var || align != 0) |
| { |
| char suffix[16]; |
| |
| if (align != 0) |
| sprintf (suffix, "XV%c%u", var ? 'L' : 'A', |
| align / BITS_PER_UNIT); |
| else |
| strcpy (suffix, "XVL"); |
| |
| field_name = concat_id_with_name (field_name, suffix); |
| } |
| |
| new_field = create_field_decl (field_name, field_type, |
| new_record_type, 0, |
| DECL_SIZE (old_field), pos, 0); |
| TREE_CHAIN (new_field) = TYPE_FIELDS (new_record_type); |
| TYPE_FIELDS (new_record_type) = new_field; |
| |
| /* If old_field is a QUAL_UNION_TYPE, take its size as being |
| zero. The only time it's not the last field of the record |
| is when there are other components at fixed positions after |
| it (meaning there was a rep clause for every field) and we |
| want to be able to encode them. */ |
| last_pos = size_binop (PLUS_EXPR, bit_position (old_field), |
| (TREE_CODE (TREE_TYPE (old_field)) |
| == QUAL_UNION_TYPE) |
| ? bitsize_zero_node |
| : DECL_SIZE (old_field)); |
| prev_old_field = old_field; |
| } |
| |
| TYPE_FIELDS (new_record_type) |
| = nreverse (TYPE_FIELDS (new_record_type)); |
| |
| rest_of_type_decl_compilation (TYPE_STUB_DECL (new_record_type)); |
| } |
| |
| rest_of_type_decl_compilation (TYPE_STUB_DECL (record_type)); |
| } |
| |
| /* Append PARALLEL_TYPE on the chain of parallel types for decl. */ |
| |
| void |
| add_parallel_type (tree decl, tree parallel_type) |
| { |
| tree d = decl; |
| |
| while (DECL_PARALLEL_TYPE (d)) |
| d = TYPE_STUB_DECL (DECL_PARALLEL_TYPE (d)); |
| |
| SET_DECL_PARALLEL_TYPE (d, parallel_type); |
| } |
| |
| /* Return the parallel type associated to a type, if any. */ |
| |
| tree |
| get_parallel_type (tree type) |
| { |
| if (TYPE_STUB_DECL (type)) |
| return DECL_PARALLEL_TYPE (TYPE_STUB_DECL (type)); |
| else |
| return NULL_TREE; |
| } |
| |
| /* Utility function of above to merge LAST_SIZE, the previous size of a record |
| with FIRST_BIT and SIZE that describe a field. SPECIAL is nonzero |
| if this represents a QUAL_UNION_TYPE in which case we must look for |
| COND_EXPRs and replace a value of zero with the old size. If HAS_REP |
| is nonzero, we must take the MAX of the end position of this field |
| with LAST_SIZE. In all other cases, we use FIRST_BIT plus SIZE. |
| |
| We return an expression for the size. */ |
| |
| static tree |
| merge_sizes (tree last_size, tree first_bit, tree size, bool special, |
| bool has_rep) |
| { |
| tree type = TREE_TYPE (last_size); |
| tree new; |
| |
| if (!special || TREE_CODE (size) != COND_EXPR) |
| { |
| new = size_binop (PLUS_EXPR, first_bit, size); |
| if (has_rep) |
| new = size_binop (MAX_EXPR, last_size, new); |
| } |
| |
| else |
| new = fold_build3 (COND_EXPR, type, TREE_OPERAND (size, 0), |
| integer_zerop (TREE_OPERAND (size, 1)) |
| ? last_size : merge_sizes (last_size, first_bit, |
| TREE_OPERAND (size, 1), |
| 1, has_rep), |
| integer_zerop (TREE_OPERAND (size, 2)) |
| ? last_size : merge_sizes (last_size, first_bit, |
| TREE_OPERAND (size, 2), |
| 1, has_rep)); |
| |
| /* We don't need any NON_VALUE_EXPRs and they can confuse us (especially |
| when fed through substitute_in_expr) into thinking that a constant |
| size is not constant. */ |
| while (TREE_CODE (new) == NON_LVALUE_EXPR) |
| new = TREE_OPERAND (new, 0); |
| |
| return new; |
| } |
| |
| /* Utility function of above to see if OP0 and OP1, both of SIZETYPE, are |
| related by the addition of a constant. Return that constant if so. */ |
| |
| static tree |
| compute_related_constant (tree op0, tree op1) |
| { |
| tree op0_var, op1_var; |
| tree op0_con = split_plus (op0, &op0_var); |
| tree op1_con = split_plus (op1, &op1_var); |
| tree result = size_binop (MINUS_EXPR, op0_con, op1_con); |
| |
| if (operand_equal_p (op0_var, op1_var, 0)) |
| return result; |
| else if (operand_equal_p (op0, size_binop (PLUS_EXPR, op1_var, result), 0)) |
| return result; |
| else |
| return 0; |
| } |
| |
| /* Utility function of above to split a tree OP which may be a sum, into a |
| constant part, which is returned, and a variable part, which is stored |
| in *PVAR. *PVAR may be bitsize_zero_node. All operations must be of |
| bitsizetype. */ |
| |
| static tree |
| split_plus (tree in, tree *pvar) |
| { |
| /* Strip NOPS in order to ease the tree traversal and maximize the |
| potential for constant or plus/minus discovery. We need to be careful |
| to always return and set *pvar to bitsizetype trees, but it's worth |
| the effort. */ |
| STRIP_NOPS (in); |
| |
| *pvar = convert (bitsizetype, in); |
| |
| if (TREE_CODE (in) == INTEGER_CST) |
| { |
| *pvar = bitsize_zero_node; |
| return convert (bitsizetype, in); |
| } |
| else if (TREE_CODE (in) == PLUS_EXPR || TREE_CODE (in) == MINUS_EXPR) |
| { |
| tree lhs_var, rhs_var; |
| tree lhs_con = split_plus (TREE_OPERAND (in, 0), &lhs_var); |
| tree rhs_con = split_plus (TREE_OPERAND (in, 1), &rhs_var); |
| |
| if (lhs_var == TREE_OPERAND (in, 0) |
| && rhs_var == TREE_OPERAND (in, 1)) |
| return bitsize_zero_node; |
| |
| *pvar = size_binop (TREE_CODE (in), lhs_var, rhs_var); |
| return size_binop (TREE_CODE (in), lhs_con, rhs_con); |
| } |
| else |
| return bitsize_zero_node; |
| } |
| |
| /* Return a FUNCTION_TYPE node. RETURN_TYPE is the type returned by the |
| subprogram. If it is void_type_node, then we are dealing with a procedure, |
| otherwise we are dealing with a function. PARAM_DECL_LIST is a list of |
| PARM_DECL nodes that are the subprogram arguments. CICO_LIST is the |
| copy-in/copy-out list to be stored into TYPE_CICO_LIST. |
| RETURNS_UNCONSTRAINED is true if the function returns an unconstrained |
| object. RETURNS_BY_REF is true if the function returns by reference. |
| RETURNS_BY_TARGET_PTR is true if the function is to be passed (as its |
| first parameter) the address of the place to copy its result. */ |
| |
| tree |
| create_subprog_type (tree return_type, tree param_decl_list, tree cico_list, |
| bool returns_unconstrained, bool returns_by_ref, |
| bool returns_by_target_ptr) |
| { |
| /* A chain of TREE_LIST nodes whose TREE_VALUEs are the data type nodes of |
| the subprogram formal parameters. This list is generated by traversing the |
| input list of PARM_DECL nodes. */ |
| tree param_type_list = NULL; |
| tree param_decl; |
| tree type; |
| |
| for (param_decl = param_decl_list; param_decl; |
| param_decl = TREE_CHAIN (param_decl)) |
| param_type_list = tree_cons (NULL_TREE, TREE_TYPE (param_decl), |
| param_type_list); |
| |
| /* The list of the function parameter types has to be terminated by the void |
| type to signal to the back-end that we are not dealing with a variable |
| parameter subprogram, but that the subprogram has a fixed number of |
| parameters. */ |
| param_type_list = tree_cons (NULL_TREE, void_type_node, param_type_list); |
| |
| /* The list of argument types has been created in reverse |
| so nreverse it. */ |
| param_type_list = nreverse (param_type_list); |
| |
| type = build_function_type (return_type, param_type_list); |
| |
| /* TYPE may have been shared since GCC hashes types. If it has a CICO_LIST |
| or the new type should, make a copy of TYPE. Likewise for |
| RETURNS_UNCONSTRAINED and RETURNS_BY_REF. */ |
| if (TYPE_CI_CO_LIST (type) || cico_list |
| || TYPE_RETURNS_UNCONSTRAINED_P (type) != returns_unconstrained |
| || TYPE_RETURNS_BY_REF_P (type) != returns_by_ref |
| || TYPE_RETURNS_BY_TARGET_PTR_P (type) != returns_by_target_ptr) |
| type = copy_type (type); |
| |
| TYPE_CI_CO_LIST (type) = cico_list; |
| TYPE_RETURNS_UNCONSTRAINED_P (type) = returns_unconstrained; |
| TYPE_RETURNS_BY_REF_P (type) = returns_by_ref; |
| TYPE_RETURNS_BY_TARGET_PTR_P (type) = returns_by_target_ptr; |
| return type; |
| } |
| |
| /* Return a copy of TYPE but safe to modify in any way. */ |
| |
| tree |
| copy_type (tree type) |
| { |
| tree new = copy_node (type); |
| |
| /* copy_node clears this field instead of copying it, because it is |
| aliased with TREE_CHAIN. */ |
| TYPE_STUB_DECL (new) = TYPE_STUB_DECL (type); |
| |
| TYPE_POINTER_TO (new) = 0; |
| TYPE_REFERENCE_TO (new) = 0; |
| TYPE_MAIN_VARIANT (new) = new; |
| TYPE_NEXT_VARIANT (new) = 0; |
| |
| return new; |
| } |
| |
| /* Return an INTEGER_TYPE of SIZETYPE with range MIN to MAX and whose |
| TYPE_INDEX_TYPE is INDEX. GNAT_NODE is used for the position of |
| the decl. */ |
| |
| tree |
| create_index_type (tree min, tree max, tree index, Node_Id gnat_node) |
| { |
| /* First build a type for the desired range. */ |
| tree type = build_index_2_type (min, max); |
| |
| /* If this type has the TYPE_INDEX_TYPE we want, return it. Otherwise, if it |
| doesn't have TYPE_INDEX_TYPE set, set it to INDEX. If TYPE_INDEX_TYPE |
| is set, but not to INDEX, make a copy of this type with the requested |
| index type. Note that we have no way of sharing these types, but that's |
| only a small hole. */ |
| if (TYPE_INDEX_TYPE (type) == index) |
| return type; |
| else if (TYPE_INDEX_TYPE (type)) |
| type = copy_type (type); |
| |
| SET_TYPE_INDEX_TYPE (type, index); |
| create_type_decl (NULL_TREE, type, NULL, true, false, gnat_node); |
| return type; |
| } |
| |
| /* Return a TYPE_DECL node. TYPE_NAME gives the name of the type (a character |
| string) and TYPE is a ..._TYPE node giving its data type. |
| ARTIFICIAL_P is true if this is a declaration that was generated |
| by the compiler. DEBUG_INFO_P is true if we need to write debugging |
| information about this type. GNAT_NODE is used for the position of |
| the decl. */ |
| |
| tree |
| create_type_decl (tree type_name, tree type, struct attrib *attr_list, |
| bool artificial_p, bool debug_info_p, Node_Id gnat_node) |
| { |
| tree type_decl = build_decl (TYPE_DECL, type_name, type); |
| enum tree_code code = TREE_CODE (type); |
| |
| DECL_ARTIFICIAL (type_decl) = artificial_p; |
| |
| if (!TYPE_IS_DUMMY_P (type)) |
| gnat_pushdecl (type_decl, gnat_node); |
| |
| process_attributes (type_decl, attr_list); |
| |
| /* Pass type declaration information to the debugger unless this is an |
| UNCONSTRAINED_ARRAY_TYPE, which the debugger does not support, |
| and ENUMERAL_TYPE or RECORD_TYPE which is handled separately, or |
| type for which debugging information was not requested. */ |
| if (code == UNCONSTRAINED_ARRAY_TYPE || !debug_info_p) |
| DECL_IGNORED_P (type_decl) = 1; |
| else if (code != ENUMERAL_TYPE |
| && (code != RECORD_TYPE || TYPE_IS_FAT_POINTER_P (type)) |
| && !((code == POINTER_TYPE || code == REFERENCE_TYPE) |
| && TYPE_IS_DUMMY_P (TREE_TYPE (type)))) |
| rest_of_type_decl_compilation (type_decl); |
| |
| return type_decl; |
| } |
| |
| /* Return a VAR_DECL or CONST_DECL node. |
| |
| VAR_NAME gives the name of the variable. ASM_NAME is its assembler name |
| (if provided). TYPE is its data type (a GCC ..._TYPE node). VAR_INIT is |
| the GCC tree for an optional initial expression; NULL_TREE if none. |
| |
| CONST_FLAG is true if this variable is constant, in which case we might |
| return a CONST_DECL node unless CONST_DECL_ALLOWED_P is false. |
| |
| PUBLIC_FLAG is true if this is for a reference to a public entity or for a |
| definition to be made visible outside of the current compilation unit, for |
| instance variable definitions in a package specification. |
| |
| EXTERN_FLAG is nonzero when processing an external variable declaration (as |
| opposed to a definition: no storage is to be allocated for the variable). |
| |
| STATIC_FLAG is only relevant when not at top level. In that case |
| it indicates whether to always allocate storage to the variable. |
| |
| GNAT_NODE is used for the position of the decl. */ |
| |
| tree |
| create_var_decl_1 (tree var_name, tree asm_name, tree type, tree var_init, |
| bool const_flag, bool public_flag, bool extern_flag, |
| bool static_flag, bool const_decl_allowed_p, |
| struct attrib *attr_list, Node_Id gnat_node) |
| { |
| bool init_const |
| = (var_init != 0 |
| && gnat_types_compatible_p (type, TREE_TYPE (var_init)) |
| && (global_bindings_p () || static_flag |
| ? initializer_constant_valid_p (var_init, TREE_TYPE (var_init)) != 0 |
| : TREE_CONSTANT (var_init))); |
| |
| /* Whether we will make TREE_CONSTANT the DECL we produce here, in which |
| case the initializer may be used in-lieu of the DECL node (as done in |
| Identifier_to_gnu). This is useful to prevent the need of elaboration |
| code when an identifier for which such a decl is made is in turn used as |
| an initializer. We used to rely on CONST vs VAR_DECL for this purpose, |
| but extra constraints apply to this choice (see below) and are not |
| relevant to the distinction we wish to make. */ |
| bool constant_p = const_flag && init_const; |
| |
| /* The actual DECL node. CONST_DECL was initially intended for enumerals |
| and may be used for scalars in general but not for aggregates. */ |
| tree var_decl |
| = build_decl ((constant_p && const_decl_allowed_p |
| && !AGGREGATE_TYPE_P (type)) ? CONST_DECL : VAR_DECL, |
| var_name, type); |
| |
| /* If this is external, throw away any initializations (they will be done |
| elsewhere) unless this is a constant for which we would like to remain |
| able to get the initializer. If we are defining a global here, leave a |
| constant initialization and save any variable elaborations for the |
| elaboration routine. If we are just annotating types, throw away the |
| initialization if it isn't a constant. */ |
| if ((extern_flag && !constant_p) |
| || (type_annotate_only && var_init && !TREE_CONSTANT (var_init))) |
| var_init = NULL_TREE; |
| |
| /* At the global level, an initializer requiring code to be generated |
| produces elaboration statements. Check that such statements are allowed, |
| that is, not violating a No_Elaboration_Code restriction. */ |
| if (global_bindings_p () && var_init != 0 && ! init_const) |
| Check_Elaboration_Code_Allowed (gnat_node); |
| |
| /* Ada doesn't feature Fortran-like COMMON variables so we shouldn't |
| try to fiddle with DECL_COMMON. However, on platforms that don't |
| support global BSS sections, uninitialized global variables would |
| go in DATA instead, thus increasing the size of the executable. */ |
| if (!flag_no_common |
| && TREE_CODE (var_decl) == VAR_DECL |
| && !have_global_bss_p ()) |
| DECL_COMMON (var_decl) = 1; |
| DECL_INITIAL (var_decl) = var_init; |
| TREE_READONLY (var_decl) = const_flag; |
| DECL_EXTERNAL (var_decl) = extern_flag; |
| TREE_PUBLIC (var_decl) = public_flag || extern_flag; |
| TREE_CONSTANT (var_decl) = constant_p; |
| TREE_THIS_VOLATILE (var_decl) = TREE_SIDE_EFFECTS (var_decl) |
| = TYPE_VOLATILE (type); |
| |
| /* If it's public and not external, always allocate storage for it. |
| At the global binding level we need to allocate static storage for the |
| variable if and only if it's not external. If we are not at the top level |
| we allocate automatic storage unless requested not to. */ |
| TREE_STATIC (var_decl) |
| = !extern_flag && (public_flag || static_flag || global_bindings_p ()); |
| |
| if (asm_name && VAR_OR_FUNCTION_DECL_P (var_decl)) |
| SET_DECL_ASSEMBLER_NAME (var_decl, asm_name); |
| |
| process_attributes (var_decl, attr_list); |
| |
| /* Add this decl to the current binding level. */ |
| gnat_pushdecl (var_decl, gnat_node); |
| |
| if (TREE_SIDE_EFFECTS (var_decl)) |
| TREE_ADDRESSABLE (var_decl) = 1; |
| |
| if (TREE_CODE (var_decl) != CONST_DECL) |
| { |
| if (global_bindings_p ()) |
| rest_of_decl_compilation (var_decl, true, 0); |
| } |
| else |
| expand_decl (var_decl); |
| |
| return var_decl; |
| } |
| |
| /* Return true if TYPE, an aggregate type, contains (or is) an array. */ |
| |
| static bool |
| aggregate_type_contains_array_p (tree type) |
| { |
| switch (TREE_CODE (type)) |
| { |
| case RECORD_TYPE: |
| case UNION_TYPE: |
| case QUAL_UNION_TYPE: |
| { |
| tree field; |
| for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field)) |
| if (AGGREGATE_TYPE_P (TREE_TYPE (field)) |
| && aggregate_type_contains_array_p (TREE_TYPE (field))) |
| return true; |
| return false; |
| } |
| |
| case ARRAY_TYPE: |
| return true; |
| |
| default: |
| gcc_unreachable (); |
| } |
| } |
| |
| /* Returns a FIELD_DECL node. FIELD_NAME the field name, FIELD_TYPE is its |
| type, and RECORD_TYPE is the type of the parent. PACKED is nonzero if |
| this field is in a record type with a "pragma pack". If SIZE is nonzero |
| it is the specified size for this field. If POS is nonzero, it is the bit |
| position. If ADDRESSABLE is nonzero, it means we are allowed to take |
| the address of this field for aliasing purposes. If it is negative, we |
| should not make a bitfield, which is used by make_aligning_type. */ |
| |
| tree |
| create_field_decl (tree field_name, tree field_type, tree record_type, |
| int packed, tree size, tree pos, int addressable) |
| { |
| tree field_decl = build_decl (FIELD_DECL, field_name, field_type); |
| |
| DECL_CONTEXT (field_decl) = record_type; |
| TREE_READONLY (field_decl) = TYPE_READONLY (field_type); |
| |
| /* If FIELD_TYPE is BLKmode, we must ensure this is aligned to at least a |
| byte boundary since GCC cannot handle less-aligned BLKmode bitfields. |
| Likewise for an aggregate without specified position that contains an |
| array, because in this case slices of variable length of this array |
| must be handled by GCC and variable-sized objects need to be aligned |
| to at least a byte boundary. */ |
| if (packed && (TYPE_MODE (field_type) == BLKmode |
| || (!pos |
| && AGGREGATE_TYPE_P (field_type) |
| && aggregate_type_contains_array_p (field_type)))) |
| DECL_ALIGN (field_decl) = BITS_PER_UNIT; |
| |
| /* If a size is specified, use it. Otherwise, if the record type is packed |
| compute a size to use, which may differ from the object's natural size. |
| We always set a size in this case to trigger the checks for bitfield |
| creation below, which is typically required when no position has been |
| specified. */ |
| if (size) |
| size = convert (bitsizetype, size); |
| else if (packed == 1) |
| { |
| size = rm_size (field_type); |
| |
| /* For a constant size larger than MAX_FIXED_MODE_SIZE, round up to |
| byte. */ |
| if (TREE_CODE (size) == INTEGER_CST |
| && compare_tree_int (size, MAX_FIXED_MODE_SIZE) > 0) |
| size = round_up (size, BITS_PER_UNIT); |
| } |
| |
| /* If we may, according to ADDRESSABLE, make a bitfield if a size is |
| specified for two reasons: first if the size differs from the natural |
| size. Second, if the alignment is insufficient. There are a number of |
| ways the latter can be true. |
| |
| We never make a bitfield if the type of the field has a nonconstant size, |
| because no such entity requiring bitfield operations should reach here. |
| |
| We do *preventively* make a bitfield when there might be the need for it |
| but we don't have all the necessary information to decide, as is the case |
| of a field with no specified position in a packed record. |
| |
| We also don't look at STRICT_ALIGNMENT here, and rely on later processing |
| in layout_decl or finish_record_type to clear the bit_field indication if |
| it is in fact not needed. */ |
| if (addressable >= 0 |
| && size |
| && TREE_CODE (size) == INTEGER_CST |
| && TREE_CODE (TYPE_SIZE (field_type)) == INTEGER_CST |
| && (!tree_int_cst_equal (size, TYPE_SIZE (field_type)) |
| || (pos && !value_factor_p (pos, TYPE_ALIGN (field_type))) |
| || packed |
| || (TYPE_ALIGN (record_type) != 0 |
| && TYPE_ALIGN (record_type) < TYPE_ALIGN (field_type)))) |
| { |
| DECL_BIT_FIELD (field_decl) = 1; |
| DECL_SIZE (field_decl) = size; |
| if (!packed && !pos) |
| DECL_ALIGN (field_decl) |
| = (TYPE_ALIGN (record_type) != 0 |
| ? MIN (TYPE_ALIGN (record_type), TYPE_ALIGN (field_type)) |
| : TYPE_ALIGN (field_type)); |
| } |
| |
| DECL_PACKED (field_decl) = pos ? DECL_BIT_FIELD (field_decl) : packed; |
| |
| /* Bump the alignment if need be, either for bitfield/packing purposes or |
| to satisfy the type requirements if no such consideration applies. When |
| we get the alignment from the type, indicate if this is from an explicit |
| user request, which prevents stor-layout from lowering it later on. */ |
| { |
| int bit_align |
| = (DECL_BIT_FIELD (field_decl) ? 1 |
| : packed && TYPE_MODE (field_type) != BLKmode ? BITS_PER_UNIT : 0); |
| |
| if (bit_align > DECL_ALIGN (field_decl)) |
| DECL_ALIGN (field_decl) = bit_align; |
| else if (!bit_align && TYPE_ALIGN (field_type) > DECL_ALIGN (field_decl)) |
| { |
| DECL_ALIGN (field_decl) = TYPE_ALIGN (field_type); |
| DECL_USER_ALIGN (field_decl) = TYPE_USER_ALIGN (field_type); |
| } |
| } |
| |
| if (pos) |
| { |
| /* We need to pass in the alignment the DECL is known to have. |
| This is the lowest-order bit set in POS, but no more than |
| the alignment of the record, if one is specified. Note |
| that an alignment of 0 is taken as infinite. */ |
| unsigned int known_align; |
| |
| if (host_integerp (pos, 1)) |
| known_align = tree_low_cst (pos, 1) & - tree_low_cst (pos, 1); |
| else |
| known_align = BITS_PER_UNIT; |
| |
| if (TYPE_ALIGN (record_type) |
| && (known_align == 0 || known_align > TYPE_ALIGN (record_type))) |
| known_align = TYPE_ALIGN (record_type); |
| |
| layout_decl (field_decl, known_align); |
| SET_DECL_OFFSET_ALIGN (field_decl, |
| host_integerp (pos, 1) ? BIGGEST_ALIGNMENT |
| : BITS_PER_UNIT); |
| pos_from_bit (&DECL_FIELD_OFFSET (field_decl), |
| &DECL_FIELD_BIT_OFFSET (field_decl), |
| DECL_OFFSET_ALIGN (field_decl), pos); |
| |
| DECL_HAS_REP_P (field_decl) = 1; |
| } |
| |
| /* In addition to what our caller says, claim the field is addressable if we |
| know that its type is not suitable. |
| |
| The field may also be "technically" nonaddressable, meaning that even if |
| we attempt to take the field's address we will actually get the address |
| of a copy. This is the case for true bitfields, but the DECL_BIT_FIELD |
| value we have at this point is not accurate enough, so we don't account |
| for this here and let finish_record_type decide. */ |
| if (!addressable && !type_for_nonaliased_component_p (field_type)) |
| addressable = 1; |
| |
| DECL_NONADDRESSABLE_P (field_decl) = !addressable; |
| |
| return field_decl; |
| } |
| |
| /* Returns a PARM_DECL node. PARAM_NAME is the name of the parameter, |
| PARAM_TYPE is its type. READONLY is true if the parameter is |
| readonly (either an In parameter or an address of a pass-by-ref |
| parameter). */ |
| |
| tree |
| create_param_decl (tree param_name, tree param_type, bool readonly) |
| { |
| tree param_decl = build_decl (PARM_DECL, param_name, param_type); |
| |
| /* Honor targetm.calls.promote_prototypes(), as not doing so can |
| lead to various ABI violations. */ |
| if (targetm.calls.promote_prototypes (param_type) |
| && (TREE_CODE (param_type) == INTEGER_TYPE |
| || TREE_CODE (param_type) == ENUMERAL_TYPE |
| || TREE_CODE (param_type) == BOOLEAN_TYPE) |
| && TYPE_PRECISION (param_type) < TYPE_PRECISION (integer_type_node)) |
| { |
| /* We have to be careful about biased types here. Make a subtype |
| of integer_type_node with the proper biasing. */ |
| if (TREE_CODE (param_type) == INTEGER_TYPE |
| && TYPE_BIASED_REPRESENTATION_P (param_type)) |
| { |
| param_type |
| = copy_type (build_range_type (integer_type_node, |
| TYPE_MIN_VALUE (param_type), |
| TYPE_MAX_VALUE (param_type))); |
| |
| TYPE_BIASED_REPRESENTATION_P (param_type) = 1; |
| } |
| else |
| param_type = integer_type_node; |
| } |
| |
| DECL_ARG_TYPE (param_decl) = param_type; |
| TREE_READONLY (param_decl) = readonly; |
| return param_decl; |
| } |
| |
| /* Given a DECL and ATTR_LIST, process the listed attributes. */ |
| |
| void |
| process_attributes (tree decl, struct attrib *attr_list) |
| { |
| for (; attr_list; attr_list = attr_list->next) |
| switch (attr_list->type) |
| { |
| case ATTR_MACHINE_ATTRIBUTE: |
| decl_attributes (&decl, tree_cons (attr_list->name, attr_list->args, |
| NULL_TREE), |
| ATTR_FLAG_TYPE_IN_PLACE); |
| break; |
| |
| case ATTR_LINK_ALIAS: |
| if (! DECL_EXTERNAL (decl)) |
| { |
| TREE_STATIC (decl) = 1; |
| assemble_alias (decl, attr_list->name); |
| } |
| break; |
| |
| case ATTR_WEAK_EXTERNAL: |
| if (SUPPORTS_WEAK) |
| declare_weak (decl); |
| else |
| post_error ("?weak declarations not supported on this target", |
| attr_list->error_point); |
| break; |
| |
| case ATTR_LINK_SECTION: |
| if (targetm.have_named_sections) |
| { |
| DECL_SECTION_NAME (decl) |
| = build_string (IDENTIFIER_LENGTH (attr_list->name), |
| IDENTIFIER_POINTER (attr_list->name)); |
| DECL_COMMON (decl) = 0; |
| } |
| else |
| post_error ("?section attributes are not supported for this target", |
| attr_list->error_point); |
| break; |
| |
| case ATTR_LINK_CONSTRUCTOR: |
| DECL_STATIC_CONSTRUCTOR (decl) = 1; |
| TREE_USED (decl) = 1; |
| break; |
| |
| case ATTR_LINK_DESTRUCTOR: |
| DECL_STATIC_DESTRUCTOR (decl) = 1; |
| TREE_USED (decl) = 1; |
| break; |
| } |
| } |
| |
| /* Record a global renaming pointer. */ |
| |
| void |
| record_global_renaming_pointer (tree decl) |
| { |
| gcc_assert (DECL_RENAMED_OBJECT (decl)); |
| VEC_safe_push (tree, gc, global_renaming_pointers, decl); |
| } |
| |
| /* Invalidate the global renaming pointers. */ |
| |
| void |
| invalidate_global_renaming_pointers (void) |
| { |
| unsigned int i; |
| tree iter; |
| |
| for (i = 0; VEC_iterate(tree, global_renaming_pointers, i, iter); i++) |
| SET_DECL_RENAMED_OBJECT (iter, NULL_TREE); |
| |
| VEC_free (tree, gc, global_renaming_pointers); |
| } |
| |
| /* Return true if VALUE is a known to be a multiple of FACTOR, which must be |
| a power of 2. */ |
| |
| bool |
| value_factor_p (tree value, HOST_WIDE_INT factor) |
| { |
| if (host_integerp (value, 1)) |
| return tree_low_cst (value, 1) % factor == 0; |
| |
| if (TREE_CODE (value) == MULT_EXPR) |
| return (value_factor_p (TREE_OPERAND (value, 0), factor) |
| || value_factor_p (TREE_OPERAND (value, 1), factor)); |
| |
| return false; |
| } |
| |
| /* Given 2 consecutive field decls PREV_FIELD and CURR_FIELD, return true |
| unless we can prove these 2 fields are laid out in such a way that no gap |
| exist between the end of PREV_FIELD and the beginning of CURR_FIELD. OFFSET |
| is the distance in bits between the end of PREV_FIELD and the starting |
| position of CURR_FIELD. It is ignored if null. */ |
| |
| static bool |
| potential_alignment_gap (tree prev_field, tree curr_field, tree offset) |
| { |
| /* If this is the first field of the record, there cannot be any gap */ |
| if (!prev_field) |
| return false; |
| |
| /* If the previous field is a union type, then return False: The only |
| time when such a field is not the last field of the record is when |
| there are other components at fixed positions after it (meaning there |
| was a rep clause for every field), in which case we don't want the |
| alignment constraint to override them. */ |
| if (TREE_CODE (TREE_TYPE (prev_field)) == QUAL_UNION_TYPE) |
| return false; |
| |
| /* If the distance between the end of prev_field and the beginning of |
| curr_field is constant, then there is a gap if the value of this |
| constant is not null. */ |
| if (offset && host_integerp (offset, 1)) |
| return !integer_zerop (offset); |
| |
| /* If the size and position of the previous field are constant, |
| then check the sum of this size and position. There will be a gap |
| iff it is not multiple of the current field alignment. */ |
| if (host_integerp (DECL_SIZE (prev_field), 1) |
| && host_integerp (bit_position (prev_field), 1)) |
| return ((tree_low_cst (bit_position (prev_field), 1) |
| + tree_low_cst (DECL_SIZE (prev_field), 1)) |
| % DECL_ALIGN (curr_field) != 0); |
| |
| /* If both the position and size of the previous field are multiples |
| of the current field alignment, there cannot be any gap. */ |
| if (value_factor_p (bit_position (prev_field), DECL_ALIGN (curr_field)) |
| && value_factor_p (DECL_SIZE (prev_field), DECL_ALIGN (curr_field))) |
| return false; |
| |
| /* Fallback, return that there may be a potential gap */ |
| return true; |
| } |
| |
| /* Returns a LABEL_DECL node for LABEL_NAME. */ |
| |
| tree |
| create_label_decl (tree label_name) |
| { |
| tree label_decl = build_decl (LABEL_DECL, label_name, void_type_node); |
| |
| DECL_CONTEXT (label_decl) = current_function_decl; |
| DECL_MODE (label_decl) = VOIDmode; |
| DECL_SOURCE_LOCATION (label_decl) = input_location; |
| |
| return label_decl; |
| } |
| |
| /* Returns a FUNCTION_DECL node. SUBPROG_NAME is the name of the subprogram, |
| ASM_NAME is its assembler name, SUBPROG_TYPE is its type (a FUNCTION_TYPE |
| node), PARAM_DECL_LIST is the list of the subprogram arguments (a list of |
| PARM_DECL nodes chained through the TREE_CHAIN field). |
| |
| INLINE_FLAG, PUBLIC_FLAG, EXTERN_FLAG, and ATTR_LIST are used to set the |
| appropriate fields in the FUNCTION_DECL. GNAT_NODE gives the location. */ |
| |
| tree |
| create_subprog_decl (tree subprog_name, tree asm_name, |
| tree subprog_type, tree param_decl_list, bool inline_flag, |
| bool public_flag, bool extern_flag, |
| struct attrib *attr_list, Node_Id gnat_node) |
| { |
| tree return_type = TREE_TYPE (subprog_type); |
| tree subprog_decl = build_decl (FUNCTION_DECL, subprog_name, subprog_type); |
| |
| /* If this is a non-inline function nested inside an inlined external |
| function, we cannot honor both requests without cloning the nested |
| function in the current unit since it is private to the other unit. |
| We could inline the nested function as well but it's probably better |
| to err on the side of too little inlining. */ |
| if (!inline_flag |
| && current_function_decl |
| && DECL_DECLARED_INLINE_P (current_function_decl) |
| && DECL_EXTERNAL (current_function_decl)) |
| DECL_DECLARED_INLINE_P (current_function_decl) = 0; |
| |
| DECL_EXTERNAL (subprog_decl) = extern_flag; |
| TREE_PUBLIC (subprog_decl) = public_flag; |
| TREE_STATIC (subprog_decl) = 1; |
| TREE_READONLY (subprog_decl) = TYPE_READONLY (subprog_type); |
| TREE_THIS_VOLATILE (subprog_decl) = TYPE_VOLATILE (subprog_type); |
| TREE_SIDE_EFFECTS (subprog_decl) = TYPE_VOLATILE (subprog_type); |
| DECL_DECLARED_INLINE_P (subprog_decl) = inline_flag; |
| DECL_ARGUMENTS (subprog_decl) = param_decl_list; |
| DECL_RESULT (subprog_decl) = build_decl (RESULT_DECL, 0, return_type); |
| DECL_ARTIFICIAL (DECL_RESULT (subprog_decl)) = 1; |
| DECL_IGNORED_P (DECL_RESULT (subprog_decl)) = 1; |
| |
| /* TREE_ADDRESSABLE is set on the result type to request the use of the |
| target by-reference return mechanism. This is not supported all the |
| way down to RTL expansion with GCC 4, which ICEs on temporary creation |
| attempts with such a type and expects DECL_BY_REFERENCE to be set on |
| the RESULT_DECL instead - see gnat_genericize for more details. */ |
| if (TREE_ADDRESSABLE (TREE_TYPE (DECL_RESULT (subprog_decl)))) |
| { |
| tree result_decl = DECL_RESULT (subprog_decl); |
| |
| TREE_ADDRESSABLE (TREE_TYPE (result_decl)) = 0; |
| DECL_BY_REFERENCE (result_decl) = 1; |
| } |
| |
| if (asm_name) |
| { |
| SET_DECL_ASSEMBLER_NAME (subprog_decl, asm_name); |
| |
| /* The expand_main_function circuitry expects "main_identifier_node" to |
| designate the DECL_NAME of the 'main' entry point, in turn expected |
| to be declared as the "main" function literally by default. Ada |
| program entry points are typically declared with a different name |
| within the binder generated file, exported as 'main' to satisfy the |
| system expectations. Redirect main_identifier_node in this case. */ |
| if (asm_name == main_identifier_node) |
| main_identifier_node = DECL_NAME (subprog_decl); |
| } |
| |
| process_attributes (subprog_decl, attr_list); |
| |
| /* Add this decl to the current binding level. */ |
| gnat_pushdecl (subprog_decl, gnat_node); |
| |
| /* Output the assembler code and/or RTL for the declaration. */ |
| rest_of_decl_compilation (subprog_decl, global_bindings_p (), 0); |
| |
| return subprog_decl; |
| } |
| |
| /* Set up the framework for generating code for SUBPROG_DECL, a subprogram |
| body. This routine needs to be invoked before processing the declarations |
| appearing in the subprogram. */ |
| |
| void |
| begin_subprog_body (tree subprog_decl) |
| { |
| tree param_decl; |
| |
| current_function_decl = subprog_decl; |
| announce_function (subprog_decl); |
| |
| /* Enter a new binding level and show that all the parameters belong to |
| this function. */ |
| gnat_pushlevel (); |
| for (param_decl = DECL_ARGUMENTS (subprog_decl); param_decl; |
| param_decl = TREE_CHAIN (param_decl)) |
| DECL_CONTEXT (param_decl) = subprog_decl; |
| |
| make_decl_rtl (subprog_decl); |
| |
| /* We handle pending sizes via the elaboration of types, so we don't need to |
| save them. This causes them to be marked as part of the outer function |
| and then discarded. */ |
| get_pending_sizes (); |
| } |
| |
| |
| /* Helper for the genericization callback. Return a dereference of VAL |
| if it is of a reference type. */ |
| |
| static tree |
| convert_from_reference (tree val) |
| { |
| tree value_type, ref; |
| |
| if (TREE_CODE (TREE_TYPE (val)) != REFERENCE_TYPE) |
| return val; |
| |
| value_type = TREE_TYPE (TREE_TYPE (val)); |
| ref = build1 (INDIRECT_REF, value_type, val); |
| |
| /* See if what we reference is CONST or VOLATILE, which requires |
| looking into array types to get to the component type. */ |
| |
| while (TREE_CODE (value_type) == ARRAY_TYPE) |
| value_type = TREE_TYPE (value_type); |
| |
| TREE_READONLY (ref) |
| = (TYPE_QUALS (value_type) & TYPE_QUAL_CONST); |
| TREE_THIS_VOLATILE (ref) |
| = (TYPE_QUALS (value_type) & TYPE_QUAL_VOLATILE); |
| |
| TREE_SIDE_EFFECTS (ref) |
| = (TREE_THIS_VOLATILE (ref) || TREE_SIDE_EFFECTS (val)); |
| |
| return ref; |
| } |
| |
| /* Helper for the genericization callback. Returns true if T denotes |
| a RESULT_DECL with DECL_BY_REFERENCE set. */ |
| |
| static inline bool |
| is_byref_result (tree t) |
| { |
| return (TREE_CODE (t) == RESULT_DECL && DECL_BY_REFERENCE (t)); |
| } |
| |
| |
| /* Tree walking callback for gnat_genericize. Currently ... |
| |
| o Adjust references to the function's DECL_RESULT if it is marked |
| DECL_BY_REFERENCE and so has had its type turned into a reference |
| type at the end of the function compilation. */ |
| |
| static tree |
| gnat_genericize_r (tree *stmt_p, int *walk_subtrees, void *data) |
| { |
| /* This implementation is modeled after what the C++ front-end is |
| doing, basis of the downstream passes behavior. */ |
| |
| tree stmt = *stmt_p; |
| struct pointer_set_t *p_set = (struct pointer_set_t*) data; |
| |
| /* If we have a direct mention of the result decl, dereference. */ |
| if (is_byref_result (stmt)) |
| { |
| *stmt_p = convert_from_reference (stmt); |
| *walk_subtrees = 0; |
| return NULL; |
| } |
| |
| /* Otherwise, no need to walk the same tree twice. */ |
| if (pointer_set_contains (p_set, stmt)) |
| { |
| *walk_subtrees = 0; |
| return NULL_TREE; |
| } |
| |
| /* If we are taking the address of what now is a reference, just get the |
| reference value. */ |
| if (TREE_CODE (stmt) == ADDR_EXPR |
| && is_byref_result (TREE_OPERAND (stmt, 0))) |
| { |
| *stmt_p = convert (TREE_TYPE (stmt), TREE_OPERAND (stmt, 0)); |
| *walk_subtrees = 0; |
| } |
| |
| /* Don't dereference an by-reference RESULT_DECL inside a RETURN_EXPR. */ |
| else if (TREE_CODE (stmt) == RETURN_EXPR |
| && TREE_OPERAND (stmt, 0) |
| && is_byref_result (TREE_OPERAND (stmt, 0))) |
| *walk_subtrees = 0; |
| |
| /* Don't look inside trees that cannot embed references of interest. */ |
| else if (IS_TYPE_OR_DECL_P (stmt)) |
| *walk_subtrees = 0; |
| |
| pointer_set_insert (p_set, *stmt_p); |
| |
| return NULL; |
| } |
| |
| /* Perform lowering of Ada trees to GENERIC. In particular: |
| |
| o Turn a DECL_BY_REFERENCE RESULT_DECL into a real by-reference decl |
| and adjust all the references to this decl accordingly. */ |
| |
| static void |
| gnat_genericize (tree fndecl) |
| { |
| /* Prior to GCC 4, an explicit By_Reference result mechanism for a function |
| was handled by simply setting TREE_ADDRESSABLE on the result type. |
| Everything required to actually pass by invisible ref using the target |
| mechanism (e.g. extra parameter) was handled at RTL expansion time. |
| |
| This doesn't work with GCC 4 any more for several reasons. First, the |
| gimplification process might need the creation of temporaries of this |
| type, and the gimplifier ICEs on such attempts. Second, the middle-end |
| now relies on a different attribute for such cases (DECL_BY_REFERENCE on |
| RESULT/PARM_DECLs), and expects the user invisible by-reference-ness to |
| be explicitly accounted for by the front-end in the function body. |
| |
| We achieve the complete transformation in two steps: |
| |
| 1/ create_subprog_decl performs early attribute tweaks: it clears |
| TREE_ADDRESSABLE from the result type and sets DECL_BY_REFERENCE on |
| the result decl. The former ensures that the bit isn't set in the GCC |
| tree saved for the function, so prevents ICEs on temporary creation. |
| The latter we use here to trigger the rest of the processing. |
| |
| 2/ This function performs the type transformation on the result decl |
| and adjusts all the references to this decl from the function body |
| accordingly. |
| |
| Clearing TREE_ADDRESSABLE from the type differs from the C++ front-end |
| strategy, which escapes the gimplifier temporary creation issues by |
| creating it's own temporaries using TARGET_EXPR nodes. Our way relies |
| on simple specific support code in aggregate_value_p to look at the |
| target function result decl explicitly. */ |
| |
| struct pointer_set_t *p_set; |
| tree decl_result = DECL_RESULT (fndecl); |
| |
| if (!DECL_BY_REFERENCE (decl_result)) |
| return; |
| |
| /* Make the DECL_RESULT explicitly by-reference and adjust all the |
| occurrences in the function body using the common tree-walking facility. |
| We want to see every occurrence of the result decl to adjust the |
| referencing tree, so need to use our own pointer set to control which |
| trees should be visited again or not. */ |
| |
| p_set = pointer_set_create (); |
| |
| TREE_TYPE (decl_result) = build_reference_type (TREE_TYPE (decl_result)); |
| TREE_ADDRESSABLE (decl_result) = 0; |
| relayout_decl (decl_result); |
| |
| walk_tree (&DECL_SAVED_TREE (fndecl), gnat_genericize_r, p_set, NULL); |
| |
| pointer_set_destroy (p_set); |
| } |
| |
| /* Finish the definition of the current subprogram BODY and compile it all the |
| way to assembler language output. ELAB_P tells if this is called for an |
| elaboration routine, to be entirely discarded if empty. */ |
| |
| void |
| end_subprog_body (tree body, bool elab_p) |
| { |
| tree fndecl = current_function_decl; |
| |
| /* Mark the BLOCK for this level as being for this function and pop the |
| level. Since the vars in it are the parameters, clear them. */ |
| BLOCK_VARS (current_binding_level->block) = 0; |
| BLOCK_SUPERCONTEXT (current_binding_level->block) = fndecl; |
| DECL_INITIAL (fndecl) = current_binding_level->block; |
| gnat_poplevel (); |
| |
| /* We handle pending sizes via the elaboration of types, so we don't |
| need to save them. */ |
| get_pending_sizes (); |
| |
| /* Mark the RESULT_DECL as being in this subprogram. */ |
| DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl; |
| |
| DECL_SAVED_TREE (fndecl) = body; |
| |
| current_function_decl = DECL_CONTEXT (fndecl); |
| set_cfun (NULL); |
| |
| /* We cannot track the location of errors past this point. */ |
| error_gnat_node = Empty; |
| |
| /* If we're only annotating types, don't actually compile this function. */ |
| if (type_annotate_only) |
| return; |
| |
| /* Perform the required pre-gimplification transformations on the tree. */ |
| gnat_genericize (fndecl); |
| |
| /* We do different things for nested and non-nested functions. |
| ??? This should be in cgraph. */ |
| if (!DECL_CONTEXT (fndecl)) |
| { |
| gnat_gimplify_function (fndecl); |
| |
| /* If this is an empty elaboration proc, just discard the node. |
| Otherwise, compile further. */ |
| if (elab_p && empty_body_p (gimple_body (fndecl))) |
| cgraph_remove_node (cgraph_node (fndecl)); |
| else |
| cgraph_finalize_function (fndecl, false); |
| } |
| else |
| /* Register this function with cgraph just far enough to get it |
| added to our parent's nested function list. */ |
| (void) cgraph_node (fndecl); |
| } |
| |
| /* Convert FNDECL's code to GIMPLE and handle any nested functions. */ |
| |
| static void |
| gnat_gimplify_function (tree fndecl) |
| { |
| struct cgraph_node *cgn; |
| |
| dump_function (TDI_original, fndecl); |
| gimplify_function_tree (fndecl); |
| dump_function (TDI_generic, fndecl); |
| |
| /* Convert all nested functions to GIMPLE now. We do things in this order |
| so that items like VLA sizes are expanded properly in the context of the |
| correct function. */ |
| cgn = cgraph_node (fndecl); |
| for (cgn = cgn->nested; cgn; cgn = cgn->next_nested) |
| gnat_gimplify_function (cgn->decl); |
| } |
| |
| |
| tree |
| gnat_builtin_function (tree decl) |
| { |
| gnat_pushdecl (decl, Empty); |
| return decl; |
| } |
| |
| /* Return an integer type with the number of bits of precision given by |
| PRECISION. UNSIGNEDP is nonzero if the type is unsigned; otherwise |
| it is a signed type. */ |
| |
| tree |
| gnat_type_for_size (unsigned precision, int unsignedp) |
| { |
| tree t; |
| char type_name[20]; |
| |
| if (precision <= 2 * MAX_BITS_PER_WORD |
| && signed_and_unsigned_types[precision][unsignedp]) |
| return signed_and_unsigned_types[precision][unsignedp]; |
| |
| if (unsignedp) |
| t = make_unsigned_type (precision); |
| else |
| t = make_signed_type (precision); |
| |
| if (precision <= 2 * MAX_BITS_PER_WORD) |
| signed_and_unsigned_types[precision][unsignedp] = t; |
| |
| if (!TYPE_NAME (t)) |
| { |
| sprintf (type_name, "%sSIGNED_%d", unsignedp ? "UN" : "", precision); |
| TYPE_NAME (t) = get_identifier (type_name); |
| } |
| |
| return t; |
| } |
| |
| /* Likewise for floating-point types. */ |
| |
| static tree |
| float_type_for_precision (int precision, enum machine_mode mode) |
| { |
| tree t; |
| char type_name[20]; |
| |
| if (float_types[(int) mode]) |
| return float_types[(int) mode]; |
| |
| float_types[(int) mode] = t = make_node (REAL_TYPE); |
| TYPE_PRECISION (t) = precision; |
| layout_type (t); |
| |
| gcc_assert (TYPE_MODE (t) == mode); |
| if (!TYPE_NAME (t)) |
| { |
| sprintf (type_name, "FLOAT_%d", precision); |
| TYPE_NAME (t) = get_identifier (type_name); |
| } |
| |
| return t; |
| } |
| |
| /* Return a data type that has machine mode MODE. UNSIGNEDP selects |
| an unsigned type; otherwise a signed type is returned. */ |
| |
| tree |
| gnat_type_for_mode (enum machine_mode mode, int unsignedp) |
| { |
| if (mode == BLKmode) |
| return NULL_TREE; |
| else if (mode == VOIDmode) |
| return void_type_node; |
| else if (COMPLEX_MODE_P (mode)) |
| return NULL_TREE; |
| else if (SCALAR_FLOAT_MODE_P (mode)) |
| return float_type_for_precision (GET_MODE_PRECISION (mode), mode); |
| else if (SCALAR_INT_MODE_P (mode)) |
| return gnat_type_for_size (GET_MODE_BITSIZE (mode), unsignedp); |
| else |
| return NULL_TREE; |
| } |
| |
| /* Return the unsigned version of a TYPE_NODE, a scalar type. */ |
| |
| tree |
| gnat_unsigned_type (tree type_node) |
| { |
| tree type = gnat_type_for_size (TYPE_PRECISION (type_node), 1); |
| |
| if (TREE_CODE (type_node) == INTEGER_TYPE && TYPE_MODULAR_P (type_node)) |
| { |
| type = copy_node (type); |
| TREE_TYPE (type) = type_node; |
| } |
| else if (TREE_TYPE (type_node) |
| && TREE_CODE (TREE_TYPE (type_node)) == INTEGER_TYPE |
| && TYPE_MODULAR_P (TREE_TYPE (type_node))) |
| { |
| type = copy_node (type); |
| TREE_TYPE (type) = TREE_TYPE (type_node); |
| } |
| |
| return type; |
| } |
| |
| /* Return the signed version of a TYPE_NODE, a scalar type. */ |
| |
| tree |
| gnat_signed_type (tree type_node) |
| { |
| tree type = gnat_type_for_size (TYPE_PRECISION (type_node), 0); |
| |
| if (TREE_CODE (type_node) == INTEGER_TYPE && TYPE_MODULAR_P (type_node)) |
| { |
| type = copy_node (type); |
| TREE_TYPE (type) = type_node; |
| } |
| else if (TREE_TYPE (type_node) |
| && TREE_CODE (TREE_TYPE (type_node)) == INTEGER_TYPE |
| && TYPE_MODULAR_P (TREE_TYPE (type_node))) |
| { |
| type = copy_node (type); |
| TREE_TYPE (type) = TREE_TYPE (type_node); |
| } |
| |
| return type; |
| } |
| |
| /* Return 1 if the types T1 and T2 are compatible, i.e. if they can be |
| transparently converted to each other. */ |
| |
| int |
| gnat_types_compatible_p (tree t1, tree t2) |
| { |
| enum tree_code code; |
| |
| /* This is the default criterion. */ |
| if (TYPE_MAIN_VARIANT (t1) == TYPE_MAIN_VARIANT (t2)) |
| return 1; |
| |
| /* We only check structural equivalence here. */ |
| if ((code = TREE_CODE (t1)) != TREE_CODE (t2)) |
| return 0; |
| |
| /* Array types are also compatible if they are constrained and have |
| the same component type and the same domain. */ |
| if (code == ARRAY_TYPE |
| && TREE_TYPE (t1) == TREE_TYPE (t2) |
| && (TYPE_DOMAIN (t1) == TYPE_DOMAIN (t2) |
| || (TYPE_DOMAIN (t1) |
| && TYPE_DOMAIN (t2) |
| && tree_int_cst_equal (TYPE_MIN_VALUE (TYPE_DOMAIN (t1)), |
| TYPE_MIN_VALUE (TYPE_DOMAIN (t2))) |
| && tree_int_cst_equal (TYPE_MAX_VALUE (TYPE_DOMAIN (t1)), |
| TYPE_MAX_VALUE (TYPE_DOMAIN (t2)))))) |
| return 1; |
| |
| /* Padding record types are also compatible if they pad the same |
| type and have the same constant size. */ |
| if (code == RECORD_TYPE |
| && TYPE_IS_PADDING_P (t1) && TYPE_IS_PADDING_P (t2) |
| && TREE_TYPE (TYPE_FIELDS (t1)) == TREE_TYPE (TYPE_FIELDS (t2)) |
| && tree_int_cst_equal (TYPE_SIZE (t1), TYPE_SIZE (t2))) |
| return 1; |
| |
| return 0; |
| } |
| |
| /* EXP is an expression for the size of an object. If this size contains |
| discriminant references, replace them with the maximum (if MAX_P) or |
| minimum (if !MAX_P) possible value of the discriminant. */ |
| |
| tree |
| max_size (tree exp, bool max_p) |
| { |
| enum tree_code code = TREE_CODE (exp); |
| tree type = TREE_TYPE (exp); |
| |
| switch (TREE_CODE_CLASS (code)) |
| { |
| case tcc_declaration: |
| case tcc_constant: |
| return exp; |
| |
| case tcc_vl_exp: |
| if (code == CALL_EXPR) |
| { |
| tree *argarray; |
| int i, n = call_expr_nargs (exp); |
| gcc_assert (n > 0); |
| |
| argarray = (tree *) alloca (n * sizeof (tree)); |
| for (i = 0; i < n; i++) |
| argarray[i] = max_size (CALL_EXPR_ARG (exp, i), max_p); |
| return build_call_array (type, CALL_EXPR_FN (exp), n, argarray); |
| } |
| break; |
| |
| case tcc_reference: |
| /* If this contains a PLACEHOLDER_EXPR, it is the thing we want to |
| modify. Otherwise, we treat it like a variable. */ |
| if (!CONTAINS_PLACEHOLDER_P (exp)) |
| return exp; |
| |
| type = TREE_TYPE (TREE_OPERAND (exp, 1)); |
| return |
| max_size (max_p ? TYPE_MAX_VALUE (type) : TYPE_MIN_VALUE (type), true); |
| |
| case tcc_comparison: |
| return max_p ? size_one_node : size_zero_node; |
| |
| case tcc_unary: |
| case tcc_binary: |
| case tcc_expression: |
| switch (TREE_CODE_LENGTH (code)) |
| { |
| case 1: |
| if (code == NON_LVALUE_EXPR) |
| return max_size (TREE_OPERAND (exp, 0), max_p); |
| else |
| return |
| fold_build1 (code, type, |
| max_size (TREE_OPERAND (exp, 0), |
| code == NEGATE_EXPR ? !max_p : max_p)); |
| |
| case 2: |
| if (code == COMPOUND_EXPR) |
| return max_size (TREE_OPERAND (exp, 1), max_p); |
| |
| /* Calculate "(A ? B : C) - D" as "A ? B - D : C - D" which |
| may provide a tighter bound on max_size. */ |
| if (code == MINUS_EXPR |
| && TREE_CODE (TREE_OPERAND (exp, 0)) == COND_EXPR) |
| { |
| tree lhs = fold_build2 (MINUS_EXPR, type, |
| TREE_OPERAND (TREE_OPERAND (exp, 0), 1), |
| TREE_OPERAND (exp, 1)); |
| tree rhs = fold_build2 (MINUS_EXPR, type, |
| TREE_OPERAND (TREE_OPERAND (exp, 0), 2), |
| TREE_OPERAND (exp, 1)); |
| return fold_build2 (max_p ? MAX_EXPR : MIN_EXPR, type, |
| max_size (lhs, max_p), |
| max_size (rhs, max_p)); |
| } |
| |
| { |
| tree lhs = max_size (TREE_OPERAND (exp, 0), max_p); |
| tree rhs = max_size (TREE_OPERAND (exp, 1), |
| code == MINUS_EXPR ? !max_p : max_p); |
| |
| /* Special-case wanting the maximum value of a MIN_EXPR. |
| In that case, if one side overflows, return the other. |
| sizetype is signed, but we know sizes are non-negative. |
| Likewise, handle a MINUS_EXPR or PLUS_EXPR with the LHS |
| overflowing or the maximum possible value and the RHS |
| a variable. */ |
| if (max_p |
| && code == MIN_EXPR |
| && TREE_CODE (rhs) == INTEGER_CST |
| && TREE_OVERFLOW (rhs)) |
| return lhs; |
| else if (max_p |
| && code == MIN_EXPR |
| && TREE_CODE (lhs) == INTEGER_CST |
| && TREE_OVERFLOW (lhs)) |
| return rhs; |
| else if ((code == MINUS_EXPR || code == PLUS_EXPR) |
| && ((TREE_CODE (lhs) == INTEGER_CST |
| && TREE_OVERFLOW (lhs)) |
| || operand_equal_p (lhs, TYPE_MAX_VALUE (type), 0)) |
| && !TREE_CONSTANT (rhs)) |
| return lhs; |
| else |
| return fold_build2 (code, type, lhs, rhs); |
| } |
| |
| case 3: |
| if (code == SAVE_EXPR) |
| return exp; |
| else if (code == COND_EXPR) |
| return fold_build2 (max_p ? MAX_EXPR : MIN_EXPR, type, |
| max_size (TREE_OPERAND (exp, 1), max_p), |
| max_size (TREE_OPERAND (exp, 2), max_p)); |
| } |
| |
| /* Other tree classes cannot happen. */ |
| default: |
| break; |
| } |
| |
| gcc_unreachable (); |
| } |
| |
| /* Build a template of type TEMPLATE_TYPE from the array bounds of ARRAY_TYPE. |
| EXPR is an expression that we can use to locate any PLACEHOLDER_EXPRs. |
| Return a constructor for the template. */ |
| |
| tree |
| build_template (tree template_type, tree array_type, tree expr) |
| { |
| tree template_elts = NULL_TREE; |
| tree bound_list = NULL_TREE; |
| tree field; |
| |
| while (TREE_CODE (array_type) == RECORD_TYPE |
| && (TYPE_IS_PADDING_P (array_type) |
| || TYPE_JUSTIFIED_MODULAR_P (array_type))) |
| array_type = TREE_TYPE (TYPE_FIELDS (array_type)); |
| |
| if (TREE_CODE (array_type) == ARRAY_TYPE |
| || (TREE_CODE (array_type) == INTEGER_TYPE |
| && TYPE_HAS_ACTUAL_BOUNDS_P (array_type))) |
| bound_list = TYPE_ACTUAL_BOUNDS (array_type); |
| |
| /* First make the list for a CONSTRUCTOR for the template. Go down the |
| field list of the template instead of the type chain because this |
| array might be an Ada array of arrays and we can't tell where the |
| nested arrays stop being the underlying object. */ |
| |
| for (field = TYPE_FIELDS (template_type); field; |
| (bound_list |
| ? (bound_list = TREE_CHAIN (bound_list)) |
| : (array_type = TREE_TYPE (array_type))), |
| field = TREE_CHAIN (TREE_CHAIN (field))) |
| { |
| tree bounds, min, max; |
| |
| /* If we have a bound list, get the bounds from there. Likewise |
| for an ARRAY_TYPE. Otherwise, if expr is a PARM_DECL with |
| DECL_BY_COMPONENT_PTR_P, use the bounds of the field in the template. |
| This will give us a maximum range. */ |
| if (bound_list) |
| bounds = TREE_VALUE (bound_list); |
| else if (TREE_CODE (array_type) == ARRAY_TYPE) |
| bounds = TYPE_INDEX_TYPE (TYPE_DOMAIN (array_type)); |
| else if (expr && TREE_CODE (expr) == PARM_DECL |
| && DECL_BY_COMPONENT_PTR_P (expr)) |
| bounds = TREE_TYPE (field); |
| else |
| gcc_unreachable (); |
| |
| min = convert (TREE_TYPE (field), TYPE_MIN_VALUE (bounds)); |
| max = convert (TREE_TYPE (TREE_CHAIN (field)), TYPE_MAX_VALUE (bounds)); |
| |
| /* If either MIN or MAX involve a PLACEHOLDER_EXPR, we must |
| substitute it from OBJECT. */ |
| min = SUBSTITUTE_PLACEHOLDER_IN_EXPR (min, expr); |
| max = SUBSTITUTE_PLACEHOLDER_IN_EXPR (max, expr); |
| |
| template_elts = tree_cons (TREE_CHAIN (field), max, |
| tree_cons (field, min, template_elts)); |
| } |
| |
| return gnat_build_constructor (template_type, nreverse (template_elts)); |
| } |
| |
| /* Build a 32bit VMS descriptor from a Mechanism_Type, which must specify |
| a descriptor type, and the GCC type of an object. Each FIELD_DECL |
| in the type contains in its DECL_INITIAL the expression to use when |
| a constructor is made for the type. GNAT_ENTITY is an entity used |
| to print out an error message if the mechanism cannot be applied to |
| an object of that type and also for the name. */ |
| |
| tree |
| build_vms_descriptor32 (tree type, Mechanism_Type mech, Entity_Id gnat_entity) |
| { |
| tree record_type = make_node (RECORD_TYPE); |
| tree pointer32_type; |
| tree field_list = 0; |
| int class; |
| int dtype = 0; |
| tree inner_type; |
| int ndim; |
| int i; |
| tree *idx_arr; |
| tree tem; |
| |
| /* If TYPE is an unconstrained array, use the underlying array type. */ |
| if (TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE) |
| type = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type)))); |
| |
| /* If this is an array, compute the number of dimensions in the array, |
| get the index types, and point to the inner type. */ |
| if (TREE_CODE (type) != ARRAY_TYPE) |
| ndim = 0; |
| else |
| for (ndim = 1, inner_type = type; |
| TREE_CODE (TREE_TYPE (inner_type)) == ARRAY_TYPE |
| && TYPE_MULTI_ARRAY_P (TREE_TYPE (inner_type)); |
| ndim++, inner_type = TREE_TYPE (inner_type)) |
| ; |
| |
| idx_arr = (tree *) alloca (ndim * sizeof (tree)); |
| |
| if (mech != By_Descriptor_NCA && mech != By_Short_Descriptor_NCA |
| && TREE_CODE (type) == ARRAY_TYPE && TYPE_CONVENTION_FORTRAN_P (type)) |
| for (i = ndim - 1, inner_type = type; |
| i >= 0; |
| i--, inner_type = TREE_TYPE (inner_type)) |
| idx_arr[i] = TYPE_DOMAIN (inner_type); |
| else |
| for (i = 0, inner_type = type; |
| i < ndim; |
| i++, inner_type = TREE_TYPE (inner_type)) |
| idx_arr[i] = TYPE_DOMAIN (inner_type); |
| |
| /* Now get the DTYPE value. */ |
| switch (TREE_CODE (type)) |
| { |
| case INTEGER_TYPE: |
| case ENUMERAL_TYPE: |
| case BOOLEAN_TYPE: |
| if (TYPE_VAX_FLOATING_POINT_P (type)) |
| switch (tree_low_cst (TYPE_DIGITS_VALUE (type), 1)) |
| { |
| case 6: |
| dtype = 10; |
| break; |
| case 9: |
| dtype = 11; |
| break; |
| case 15: |
| dtype = 27; |
| break; |
| } |
| else |
| switch (GET_MODE_BITSIZE (TYPE_MODE (type))) |
| { |
| case 8: |
| dtype = TYPE_UNSIGNED (type) ? 2 : 6; |
| break; |
| case 16: |
| dtype = TYPE_UNSIGNED (type) ? 3 : 7; |
| break; |
| case 32: |
| dtype = TYPE_UNSIGNED (type) ? 4 : 8; |
| break; |
| case 64: |
| dtype = TYPE_UNSIGNED (type) ? 5 : 9; |
| break; |
| case 128: |
| dtype = TYPE_UNSIGNED (type) ? 25 : 26; |
| break; |
| } |
| break; |
| |
| case REAL_TYPE: |
| dtype = GET_MODE_BITSIZE (TYPE_MODE (type)) == 32 ? 52 : 53; |
| break; |
| |
| case COMPLEX_TYPE: |
| if (TREE_CODE (TREE_TYPE (type)) == INTEGER_TYPE |
| && TYPE_VAX_FLOATING_POINT_P (type)) |
| switch (tree_low_cst (TYPE_DIGITS_VALUE (type), 1)) |
| { |
| case 6: |
| dtype = 12; |
| break; |
| case 9: |
| dtype = 13; |
| break; |
| case 15: |
| dtype = 29; |
| } |
| else |
| dtype = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (type))) == 32 ? 54: 55; |
| break; |
| |
| case ARRAY_TYPE: |
| dtype = 14; |
| break; |
| |
| default: |
| break; |
| } |
| |
| /* Get the CLASS value. */ |
| switch (mech) |
| { |
| case By_Descriptor_A: |
| case By_Short_Descriptor_A: |
| class = 4; |
| break; |
| case By_Descriptor_NCA: |
| case By_Short_Descriptor_NCA: |
| class = 10; |
| break; |
| case By_Descriptor_SB: |
| case By_Short_Descriptor_SB: |
| class = 15; |
| break; |
| case By_Descriptor: |
| case By_Short_Descriptor: |
| case By_Descriptor_S: |
| case By_Short_Descriptor_S: |
| default: |
| class = 1; |
| break; |
| } |
| |
| /* Make the type for a descriptor for VMS. The first four fields |
| are the same for all types. */ |
| |
| field_list |
| = chainon (field_list, |
| make_descriptor_field |
| ("LENGTH", gnat_type_for_size (16, 1), record_type, |
| size_in_bytes ((mech == By_Descriptor_A || |
| mech == By_Short_Descriptor_A) |
| ? inner_type : type))); |
| |
| field_list = chainon (field_list, |
| make_descriptor_field ("DTYPE", |
| gnat_type_for_size (8, 1), |
| record_type, size_int (dtype))); |
| field_list = chainon (field_list, |
| make_descriptor_field ("CLASS", |
| gnat_type_for_size (8, 1), |
| record_type, size_int (class))); |
| |
| /* Of course this will crash at run-time if the address space is not |
| within the low 32 bits, but there is nothing else we can do. */ |
| pointer32_type = build_pointer_type_for_mode (type, SImode, false); |
| |
| field_list |
| = chainon (field_list, |
| make_descriptor_field |
| ("POINTER", pointer32_type, record_type, |
| build_unary_op (ADDR_EXPR, |
| pointer32_type, |
| build0 (PLACEHOLDER_EXPR, type)))); |
| |
| switch (mech) |
| { |
| case By_Descriptor: |
| case By_Short_Descriptor: |
| case By_Descriptor_S: |
| case By_Short_Descriptor_S: |
| break; |
| |
| case By_Descriptor_SB: |
| case By_Short_Descriptor_SB: |
| field_list |
| = chainon (field_list, |
| make_descriptor_field |
| ("SB_L1", gnat_type_for_size (32, 1), record_type, |
| TREE_CODE (type) == ARRAY_TYPE |
| ? TYPE_MIN_VALUE (TYPE_DOMAIN (type)) : size_zero_node)); |
| field_list |
| = chainon (field_list, |
| make_descriptor_field |
| ("SB_U1", gnat_type_for_size (32, 1), record_type, |
| TREE_CODE (type) == ARRAY_TYPE |
| ? TYPE_MAX_VALUE (TYPE_DOMAIN (type)) : size_zero_node)); |
| break; |
| |
| case By_Descriptor_A: |
| case By_Short_Descriptor_A: |
| case By_Descriptor_NCA: |
| case By_Short_Descriptor_NCA: |
| field_list = chainon (field_list, |
| make_descriptor_field ("SCALE", |
| gnat_type_for_size (8, 1), |
| record_type, |
| size_zero_node)); |
| |
| field_list = chainon (field_list, |
| make_descriptor_field ("DIGITS", |
| gnat_type_for_size (8, 1), |
| record_type, |
| size_zero_node)); |
| |
| field_list |
| = chainon (field_list, |
| make_descriptor_field |
| ("AFLAGS", gnat_type_for_size (8, 1), record_type, |
| size_int ((mech == By_Descriptor_NCA || |
| mech == By_Short_Descriptor_NCA) |
| ? 0 |
| /* Set FL_COLUMN, FL_COEFF, and FL_BOUNDS. */ |
| : (TREE_CODE (type) == ARRAY_TYPE |
| && TYPE_CONVENTION_FORTRAN_P (type) |
| ? 224 : 192)))); |
| |
| field_list = chainon (field_list, |
| make_descriptor_field ("DIMCT", |
| gnat_type_for_size (8, 1), |
| record_type, |
| size_int (ndim))); |
| |
| field_list = chainon (field_list, |
| make_descriptor_field ("ARSIZE", |
| gnat_type_for_size (32, 1), |
| record_type, |
| size_in_bytes (type))); |
| |
| /* Now build a pointer to the 0,0,0... element. */ |
| tem = build0 (PLACEHOLDER_EXPR, type); |
| for (i = 0, inner_type = type; i < ndim; |
| i++, inner_type = TREE_TYPE (inner_type)) |
| tem = build4 (ARRAY_REF, TREE_TYPE (inner_type), tem, |
| convert (TYPE_DOMAIN (inner_type), size_zero_node), |
| NULL_TREE, NULL_TREE); |
| |
| field_list |
| = chainon (field_list, |
| make_descriptor_field |
| ("A0", |
| build_pointer_type_for_mode (inner_type, SImode, false), |
| record_type, |
| build1 (ADDR_EXPR, |
| build_pointer_type_for_mode (inner_type, SImode, |
| false), |
| tem))); |
| |
| /* Next come the addressing coefficients. */ |
| tem = size_one_node; |
| for (i = 0; i < ndim; i++) |
| { |
| char fname[3]; |
| tree idx_length |
| = size_binop (MULT_EXPR, tem, |
| size_binop (PLUS_EXPR, |
| size_binop (MINUS_EXPR, |
| TYPE_MAX_VALUE (idx_arr[i]), |
| TYPE_MIN_VALUE (idx_arr[i])), |
| size_int (1))); |
| |
| fname[0] = ((mech == By_Descriptor_NCA || |
| mech == By_Short_Descriptor_NCA) ? 'S' : 'M'); |
| fname[1] = '0' + i, fname[2] = 0; |
| field_list |
| = chainon (field_list, |
| make_descriptor_field (fname, |
| gnat_type_for_size (32, 1), |
| record_type, idx_length)); |
| |
| if (mech == By_Descriptor_NCA || mech == By_Short_Descriptor_NCA) |
| tem = idx_length; |
| } |
| |
| /* Finally here are the bounds. */ |
| for (i = 0; i < ndim; i++) |
| { |
| char fname[3]; |
| |
| fname[0] = 'L', fname[1] = '0' + i, fname[2] = 0; |
| field_list |
| = chainon (field_list, |
| make_descriptor_field |
| (fname, gnat_type_for_size (32, 1), record_type, |
| TYPE_MIN_VALUE (idx_arr[i]))); |
| |
| fname[0] = 'U'; |
| field_list |
| = chainon (field_list, |
| make_descriptor_field |
| (fname, gnat_type_for_size (32, 1), record_type, |
| TYPE_MAX_VALUE (idx_arr[i]))); |
| } |
| break; |
| |
| default: |
| post_error ("unsupported descriptor type for &", gnat_entity); |
| } |
| |
| finish_record_type (record_type, field_list, 0, true); |
| create_type_decl (create_concat_name (gnat_entity, "DESC"), record_type, |
| NULL, true, false, gnat_entity); |
| |
| return record_type; |
| } |
| |
| /* Build a 64bit VMS descriptor from a Mechanism_Type, which must specify |
| a descriptor type, and the GCC type of an object. Each FIELD_DECL |
| in the type contains in its DECL_INITIAL the expression to use when |
| a constructor is made for the type. GNAT_ENTITY is an entity used |
| to print out an error message if the mechanism cannot be applied to |
| an object of that type and also for the name. */ |
| |
| tree |
| build_vms_descriptor (tree type, Mechanism_Type mech, Entity_Id gnat_entity) |
| { |
| tree record64_type = make_node (RECORD_TYPE); |
| tree pointer64_type; |
| tree field_list64 = 0; |
| int class; |
| int dtype = 0; |
| tree inner_type; |
| int ndim; |
| int i; |
| tree *idx_arr; |
| tree tem; |
| |
| /* If TYPE is an unconstrained array, use the underlying array type. */ |
| if (TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE) |
| type = TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type)))); |
| |
| /* If this is an array, compute the number of dimensions in the array, |
| get the index types, and point to the inner type. */ |
| if (TREE_CODE (type) != ARRAY_TYPE) |
| ndim = 0; |
| else |
| for (ndim = 1, inner_type = type; |
| TREE_CODE (TREE_TYPE (inner_type)) == ARRAY_TYPE |
| && TYPE_MULTI_ARRAY_P (TREE_TYPE (inner_type)); |
| ndim++, inner_type = TREE_TYPE (inner_type)) |
| ; |
| |
| idx_arr = (tree *) alloca (ndim * sizeof (tree)); |
| |
| if (mech != By_Descriptor_NCA |
| && TREE_CODE (type) == ARRAY_TYPE && TYPE_CONVENTION_FORTRAN_P (type)) |
| for (i = ndim - 1, inner_type = type; |
| i >= 0; |
| i--, inner_type = TREE_TYPE (inner_type)) |
| idx_arr[i] = TYPE_DOMAIN (inner_type); |
| else |
| for (i = 0, inner_type = type; |
| i < ndim; |
| i++, inner_type = TREE_TYPE (inner_type)) |
| idx_arr[i] = TYPE_DOMAIN (inner_type); |
| |
| /* Now get the DTYPE value. */ |
| switch (TREE_CODE (type)) |
| { |
| case INTEGER_TYPE: |
| case ENUMERAL_TYPE: |
| case BOOLEAN_TYPE: |
| if (TYPE_VAX_FLOATING_POINT_P (type)) |
| switch (tree_low_cst (TYPE_DIGITS_VALUE (type), 1)) |
| { |
| case 6: |
| dtype = 10; |
| break; |
| case 9: |
| dtype = 11; |
| break; |
| case 15: |
| dtype = 27; |
| break; |
| } |
| else |
| switch (GET_MODE_BITSIZE (TYPE_MODE (type))) |
| { |
| case 8: |
| dtype = TYPE_UNSIGNED (type) ? 2 : 6; |
| break; |
| case 16: |
| dtype = TYPE_UNSIGNED (type) ? 3 : 7; |
| break; |
| case 32: |
| dtype = TYPE_UNSIGNED (type) ? 4 : 8; |
| break; |
| case 64: |
| dtype = TYPE_UNSIGNED (type) ? 5 : 9; |
| break; |
| case 128: |
| dtype = TYPE_UNSIGNED (type) ? 25 : 26; |
| break; |
| } |
| break; |
| |
| case REAL_TYPE: |
| dtype = GET_MODE_BITSIZE (TYPE_MODE (type)) == 32 ? 52 : 53; |
| break; |
| |
| case COMPLEX_TYPE: |
| if (TREE_CODE (TREE_TYPE (type)) == INTEGER_TYPE |
| && TYPE_VAX_FLOATING_POINT_P (type)) |
| switch (tree_low_cst (TYPE_DIGITS_VALUE (type), 1)) |
| { |
| case 6: |
| dtype = 12; |
| break; |
| case 9: |
| dtype = 13; |
| break; |
| case 15: |
| dtype = 29; |
| } |
| else |
| dtype = GET_MODE_BITSIZE (TYPE_MODE (TREE_TYPE (type))) == 32 ? 54: 55; |
| break; |
| |
| case ARRAY_TYPE: |
| dtype = 14; |
| break; |
| |
| default: |
| break; |
| } |
| |
| /* Get the CLASS value. */ |
| switch (mech) |
| { |
| case By_Descriptor_A: |
| class = 4; |
| break; |
| case By_Descriptor_NCA: |
| class = 10; |
| break; |
| case By_Descriptor_SB: |
| class = 15; |
| break; |
| case By_Descriptor: |
| case By_Descriptor_S: |
| default: |
| class = 1; |
| break; |
| } |
| |
| /* Make the type for a 64bit descriptor for VMS. The first six fields |
| are the same for all types. */ |
| |
| field_list64 = chainon (field_list64, |
| make_descriptor_field ("MBO", |
| gnat_type_for_size (16, 1), |
| record64_type, size_int (1))); |
| |
| field_list64 = chainon (field_list64, |
| make_descriptor_field ("DTYPE", |
| gnat_type_for_size (8, 1), |
| record64_type, size_int (dtype))); |
| field_list64 = chainon (field_list64, |
| make_descriptor_field ("CLASS", |
| gnat_type_for_size (8, 1), |
| record64_type, size_int (class))); |
| |
| field_list64 = chainon (field_list64, |
| make_descriptor_field ("MBMO", |
| gnat_type_for_size (32, 1), |
| record64_type, ssize_int (-1))); |
| |
| field_list64 |
| = chainon (field_list64, |
| make_descriptor_field |
| ("LENGTH", gnat_type_for_size (64, 1), record64_type, |
| size_in_bytes (mech == By_Descriptor_A ? inner_type : type))); |
| |
| pointer64_type = build_pointer_type_for_mode (type, DImode, false); |
| |
| field_list64 |
| = chainon (field_list64, |
| make_descriptor_field |
| ("POINTER", pointer64_type, record64_type, |
| build_unary_op (ADDR_EXPR, |
| pointer64_type, |
| build0 (PLACEHOLDER_EXPR, type)))); |
| |
| switch (mech) |
| { |
| case By_Descriptor: |
| case By_Descriptor_S: |
| break; |
| |
| case By_Descriptor_SB: |
| field_list64 |
| = chainon (field_list64, |
| make_descriptor_field |
| ("SB_L1", gnat_type_for_size (64, 1), record64_type, |
| TREE_CODE (type) == ARRAY_TYPE |
| ? TYPE_MIN_VALUE (TYPE_DOMAIN (type)) : size_zero_node)); |
| field_list64 |
| = chainon (field_list64, |
| make_descriptor_field |
| ("SB_U1", gnat_type_for_size (64, 1), record64_type, |
| TREE_CODE (type) == ARRAY_TYPE |
| ? TYPE_MAX_VALUE (TYPE_DOMAIN (type)) : size_zero_node)); |
| break; |
| |
| case By_Descriptor_A: |
| case By_Descriptor_NCA: |
| field_list64 = chainon (field_list64, |
| make_descriptor_field ("SCALE", |
| gnat_type_for_size (8, 1), |
| record64_type, |
| size_zero_node)); |
| |
| field_list64 = chainon (field_list64, |
| make_descriptor_field ("DIGITS", |
| gnat_type_for_size (8, 1), |
| record64_type, |
| size_zero_node)); |
| |
| field_list64 |
| = chainon (field_list64, |
| make_descriptor_field |
| ("AFLAGS", gnat_type_for_size (8, 1), record64_type, |
| size_int (mech == By_Descriptor_NCA |
| ? 0 |
| /* Set FL_COLUMN, FL_COEFF, and FL_BOUNDS. */ |
| : (TREE_CODE (type) == ARRAY_TYPE |
| && TYPE_CONVENTION_FORTRAN_P (type) |
| ? 224 : 192)))); |
| |
| field_list64 = chainon (field_list64, |
| make_descriptor_field ("DIMCT", |
| gnat_type_for_size (8, 1), |
| record64_type, |
| size_int (ndim))); |
| |
| field_list64 = chainon (field_list64, |
| make_descriptor_field ("MBZ", |
| gnat_type_for_size (32, 1), |
| record64_type, |
| size_int (0))); |
| field_list64 = chainon (field_list64, |
| make_descriptor_field ("ARSIZE", |
| gnat_type_for_size (64, 1), |
| record64_type, |
| size_in_bytes (type))); |
| |
| /* Now build a pointer to the 0,0,0... element. */ |
| tem = build0 (PLACEHOLDER_EXPR, type); |
| for (i = 0, inner_type = type; i < ndim; |
| i++, inner_type = TREE_TYPE (inner_type)) |
| tem = build4 (ARRAY_REF, TREE_TYPE (inner_type), tem, |
| convert (TYPE_DOMAIN (inner_type), size_zero_node), |
| NULL_TREE, NULL_TREE); |
| |
| field_list64 |
| = chainon (field_list64, |
| make_descriptor_field |
| ("A0", |
| build_pointer_type_for_mode (inner_type, DImode, false), |
| record64_type, |
| build1 (ADDR_EXPR, |
| build_pointer_type_for_mode (inner_type, DImode, |
| false), |
| tem))); |
| |
| /* Next come the addressing coefficients. */ |
| tem = size_one_node; |
| for (i = 0; i < ndim; i++) |
| { |
| char fname[3]; |
| tree idx_length |
| = size_binop (MULT_EXPR, tem, |
| size_binop (PLUS_EXPR, |
| size_binop (MINUS_EXPR, |
| TYPE_MAX_VALUE (idx_arr[i]), |
| TYPE_MIN_VALUE (idx_arr[i])), |
| size_int (1))); |
| |
| fname[0] = (mech == By_Descriptor_NCA ? 'S' : 'M'); |
| fname[1] = '0' + i, fname[2] = 0; |
| field_list64 |
| = chainon (field_list64, |
| make_descriptor_field (fname, |
| gnat_type_for_size (64, 1), |
| record64_type, idx_length)); |
| |
| if (mech == By_Descriptor_NCA) |
| tem = idx_length; |
| } |
| |
| /* Finally here are the bounds. */ |
| for (i = 0; i < ndim; i++) |
| { |
| char fname[3]; |
| |
| fname[0] = 'L', fname[1] = '0' + i, fname[2] = 0; |
| field_list64 |
| = chainon (field_list64, |
| make_descriptor_field |
| (fname, gnat_type_for_size (64, 1), record64_type, |
| TYPE_MIN_VALUE (idx_arr[i]))); |
| |
| fname[0] = 'U'; |
| field_list64 |
| = chainon (field_list64, |
| make_descriptor_field |
| (fname, gnat_type_for_size (64, 1), record64_type, |
| TYPE_MAX_VALUE (idx_arr[i]))); |
| } |
| break; |
| |
| default: |
| post_error ("unsupported descriptor type for &", gnat_entity); |
| } |
| |
| finish_record_type (record64_type, field_list64, 0, true); |
| create_type_decl (create_concat_name (gnat_entity, "DESC64"), record64_type, |
| NULL, true, false, gnat_entity); |
| |
| return record64_type; |
| } |
| |
| /* Utility routine for above code to make a field. */ |
| |
| static tree |
| make_descriptor_field (const char *name, tree type, |
| tree rec_type, tree initial) |
| { |
| tree field |
| = create_field_decl (get_identifier (name), type, rec_type, 0, 0, 0, 0); |
| |
| DECL_INITIAL (field) = initial; |
| return field; |
| } |
| |
| /* Convert GNU_EXPR, a pointer to a 64bit VMS descriptor, to GNU_TYPE, a |
| regular pointer or fat pointer type. GNAT_SUBPROG is the subprogram to |
| which the VMS descriptor is passed. */ |
| |
| static tree |
| convert_vms_descriptor64 (tree gnu_type, tree gnu_expr, Entity_Id gnat_subprog) |
| { |
| tree desc_type = TREE_TYPE (TREE_TYPE (gnu_expr)); |
| tree desc = build1 (INDIRECT_REF, desc_type, gnu_expr); |
| /* The CLASS field is the 3rd field in the descriptor. */ |
| tree class = TREE_CHAIN (TREE_CHAIN (TYPE_FIELDS (desc_type))); |
| /* The POINTER field is the 6th field in the descriptor. */ |
| tree pointer64 = TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (class))); |
| |
| /* Retrieve the value of the POINTER field. */ |
| tree gnu_expr64 |
| = build3 (COMPONENT_REF, TREE_TYPE (pointer64), desc, pointer64, NULL_TREE); |
| |
| if (POINTER_TYPE_P (gnu_type)) |
| return convert (gnu_type, gnu_expr64); |
| |
| else if (TYPE_FAT_POINTER_P (gnu_type)) |
| { |
| tree p_array_type = TREE_TYPE (TYPE_FIELDS (gnu_type)); |
| tree p_bounds_type = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type))); |
| tree template_type = TREE_TYPE (p_bounds_type); |
| tree min_field = TYPE_FIELDS (template_type); |
| tree max_field = TREE_CHAIN (TYPE_FIELDS (template_type)); |
| tree template, template_addr, aflags, dimct, t, u; |
| /* See the head comment of build_vms_descriptor. */ |
| int iclass = TREE_INT_CST_LOW (DECL_INITIAL (class)); |
| tree lfield, ufield; |
| |
| /* Convert POINTER to the type of the P_ARRAY field. */ |
| gnu_expr64 = convert (p_array_type, gnu_expr64); |
| |
| switch (iclass) |
| { |
| case 1: /* Class S */ |
| case 15: /* Class SB */ |
| /* Build {1, LENGTH} template; LENGTH64 is the 5th field. */ |
| t = TREE_CHAIN (TREE_CHAIN (class)); |
| t = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
| t = tree_cons (min_field, |
| convert (TREE_TYPE (min_field), integer_one_node), |
| tree_cons (max_field, |
| convert (TREE_TYPE (max_field), t), |
| NULL_TREE)); |
| template = gnat_build_constructor (template_type, t); |
| template_addr = build_unary_op (ADDR_EXPR, NULL_TREE, template); |
| |
| /* For class S, we are done. */ |
| if (iclass == 1) |
| break; |
| |
| /* Test that we really have a SB descriptor, like DEC Ada. */ |
| t = build3 (COMPONENT_REF, TREE_TYPE (class), desc, class, NULL); |
| u = convert (TREE_TYPE (class), DECL_INITIAL (class)); |
| u = build_binary_op (EQ_EXPR, integer_type_node, t, u); |
| /* If so, there is already a template in the descriptor and |
| it is located right after the POINTER field. The fields are |
| 64bits so they must be repacked. */ |
| t = TREE_CHAIN (pointer64); |
| lfield = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
| lfield = convert (TREE_TYPE (TYPE_FIELDS (template_type)), lfield); |
| |
| t = TREE_CHAIN (t); |
| ufield = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
| ufield = convert |
| (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (template_type))), ufield); |
| |
| /* Build the template in the form of a constructor. */ |
| t = tree_cons (TYPE_FIELDS (template_type), lfield, |
| tree_cons (TREE_CHAIN (TYPE_FIELDS (template_type)), |
| ufield, NULL_TREE)); |
| template = gnat_build_constructor (template_type, t); |
| |
| /* Otherwise use the {1, LENGTH} template we build above. */ |
| template_addr = build3 (COND_EXPR, p_bounds_type, u, |
| build_unary_op (ADDR_EXPR, p_bounds_type, |
| template), |
| template_addr); |
| break; |
| |
| case 4: /* Class A */ |
| /* The AFLAGS field is the 3rd field after the pointer in the |
| descriptor. */ |
| t = TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (pointer64))); |
| aflags = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
| /* The DIMCT field is the next field in the descriptor after |
| aflags. */ |
| t = TREE_CHAIN (t); |
| dimct = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
| /* Raise CONSTRAINT_ERROR if either more than 1 dimension |
| or FL_COEFF or FL_BOUNDS not set. */ |
| u = build_int_cst (TREE_TYPE (aflags), 192); |
| u = build_binary_op (TRUTH_OR_EXPR, integer_type_node, |
| build_binary_op (NE_EXPR, integer_type_node, |
| dimct, |
| convert (TREE_TYPE (dimct), |
| size_one_node)), |
| build_binary_op (NE_EXPR, integer_type_node, |
| build2 (BIT_AND_EXPR, |
| TREE_TYPE (aflags), |
| aflags, u), |
| u)); |
| /* There is already a template in the descriptor and it is located |
| in block 3. The fields are 64bits so they must be repacked. */ |
| t = TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (TREE_CHAIN |
| (t))))); |
| lfield = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
| lfield = convert (TREE_TYPE (TYPE_FIELDS (template_type)), lfield); |
| |
| t = TREE_CHAIN (t); |
| ufield = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
| ufield = convert |
| (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (template_type))), ufield); |
| |
| /* Build the template in the form of a constructor. */ |
| t = tree_cons (TYPE_FIELDS (template_type), lfield, |
| tree_cons (TREE_CHAIN (TYPE_FIELDS (template_type)), |
| ufield, NULL_TREE)); |
| template = gnat_build_constructor (template_type, t); |
| template = build3 (COND_EXPR, p_bounds_type, u, |
| build_call_raise (CE_Length_Check_Failed, Empty, |
| N_Raise_Constraint_Error), |
| template); |
| template_addr = build_unary_op (ADDR_EXPR, p_bounds_type, template); |
| break; |
| |
| case 10: /* Class NCA */ |
| default: |
| post_error ("unsupported descriptor type for &", gnat_subprog); |
| template_addr = integer_zero_node; |
| break; |
| } |
| |
| /* Build the fat pointer in the form of a constructor. */ |
| t = tree_cons (TYPE_FIELDS (gnu_type), gnu_expr64, |
| tree_cons (TREE_CHAIN (TYPE_FIELDS (gnu_type)), |
| template_addr, NULL_TREE)); |
| return gnat_build_constructor (gnu_type, t); |
| } |
| |
| else |
| gcc_unreachable (); |
| } |
| |
| /* Convert GNU_EXPR, a pointer to a 32bit VMS descriptor, to GNU_TYPE, a |
| regular pointer or fat pointer type. GNAT_SUBPROG is the subprogram to |
| which the VMS descriptor is passed. */ |
| |
| static tree |
| convert_vms_descriptor32 (tree gnu_type, tree gnu_expr, Entity_Id gnat_subprog) |
| { |
| tree desc_type = TREE_TYPE (TREE_TYPE (gnu_expr)); |
| tree desc = build1 (INDIRECT_REF, desc_type, gnu_expr); |
| /* The CLASS field is the 3rd field in the descriptor. */ |
| tree class = TREE_CHAIN (TREE_CHAIN (TYPE_FIELDS (desc_type))); |
| /* The POINTER field is the 4th field in the descriptor. */ |
| tree pointer = TREE_CHAIN (class); |
| |
| /* Retrieve the value of the POINTER field. */ |
| tree gnu_expr32 |
| = build3 (COMPONENT_REF, TREE_TYPE (pointer), desc, pointer, NULL_TREE); |
| |
| if (POINTER_TYPE_P (gnu_type)) |
| return convert (gnu_type, gnu_expr32); |
| |
| else if (TYPE_FAT_POINTER_P (gnu_type)) |
| { |
| tree p_array_type = TREE_TYPE (TYPE_FIELDS (gnu_type)); |
| tree p_bounds_type = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (gnu_type))); |
| tree template_type = TREE_TYPE (p_bounds_type); |
| tree min_field = TYPE_FIELDS (template_type); |
| tree max_field = TREE_CHAIN (TYPE_FIELDS (template_type)); |
| tree template, template_addr, aflags, dimct, t, u; |
| /* See the head comment of build_vms_descriptor. */ |
| int iclass = TREE_INT_CST_LOW (DECL_INITIAL (class)); |
| |
| /* Convert POINTER to the type of the P_ARRAY field. */ |
| gnu_expr32 = convert (p_array_type, gnu_expr32); |
| |
| switch (iclass) |
| { |
| case 1: /* Class S */ |
| case 15: /* Class SB */ |
| /* Build {1, LENGTH} template; LENGTH is the 1st field. */ |
| t = TYPE_FIELDS (desc_type); |
| t = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
| t = tree_cons (min_field, |
| convert (TREE_TYPE (min_field), integer_one_node), |
| tree_cons (max_field, |
| convert (TREE_TYPE (max_field), t), |
| NULL_TREE)); |
| template = gnat_build_constructor (template_type, t); |
| template_addr = build_unary_op (ADDR_EXPR, NULL_TREE, template); |
| |
| /* For class S, we are done. */ |
| if (iclass == 1) |
| break; |
| |
| /* Test that we really have a SB descriptor, like DEC Ada. */ |
| t = build3 (COMPONENT_REF, TREE_TYPE (class), desc, class, NULL); |
| u = convert (TREE_TYPE (class), DECL_INITIAL (class)); |
| u = build_binary_op (EQ_EXPR, integer_type_node, t, u); |
| /* If so, there is already a template in the descriptor and |
| it is located right after the POINTER field. */ |
| t = TREE_CHAIN (pointer); |
| template = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
| /* Otherwise use the {1, LENGTH} template we build above. */ |
| template_addr = build3 (COND_EXPR, p_bounds_type, u, |
| build_unary_op (ADDR_EXPR, p_bounds_type, |
| template), |
| template_addr); |
| break; |
| |
| case 4: /* Class A */ |
| /* The AFLAGS field is the 7th field in the descriptor. */ |
| t = TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (pointer))); |
| aflags = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
| /* The DIMCT field is the 8th field in the descriptor. */ |
| t = TREE_CHAIN (t); |
| dimct = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
| /* Raise CONSTRAINT_ERROR if either more than 1 dimension |
| or FL_COEFF or FL_BOUNDS not set. */ |
| u = build_int_cst (TREE_TYPE (aflags), 192); |
| u = build_binary_op (TRUTH_OR_EXPR, integer_type_node, |
| build_binary_op (NE_EXPR, integer_type_node, |
| dimct, |
| convert (TREE_TYPE (dimct), |
| size_one_node)), |
| build_binary_op (NE_EXPR, integer_type_node, |
| build2 (BIT_AND_EXPR, |
| TREE_TYPE (aflags), |
| aflags, u), |
| u)); |
| /* There is already a template in the descriptor and it is |
| located at the start of block 3 (12th field). */ |
| t = TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (t)))); |
| template = build3 (COMPONENT_REF, TREE_TYPE (t), desc, t, NULL_TREE); |
| template = build3 (COND_EXPR, p_bounds_type, u, |
| build_call_raise (CE_Length_Check_Failed, Empty, |
| N_Raise_Constraint_Error), |
| template); |
| template_addr = build_unary_op (ADDR_EXPR, p_bounds_type, template); |
| break; |
| |
| case 10: /* Class NCA */ |
| default: |
| post_error ("unsupported descriptor type for &", gnat_subprog); |
| template_addr = integer_zero_node; |
| break; |
| } |
| |
| /* Build the fat pointer in the form of a constructor. */ |
| t = tree_cons (TYPE_FIELDS (gnu_type), gnu_expr32, |
| tree_cons (TREE_CHAIN (TYPE_FIELDS (gnu_type)), |
| template_addr, NULL_TREE)); |
| |
| return gnat_build_constructor (gnu_type, t); |
| } |
| |
| else |
| gcc_unreachable (); |
| } |
| |
| /* Convert GNU_EXPR, a pointer to a VMS descriptor, to GNU_TYPE, a regular |
| pointer or fat pointer type. GNU_EXPR_ALT_TYPE is the alternate (32-bit) |
| pointer type of GNU_EXPR. GNAT_SUBPROG is the subprogram to which the |
| VMS descriptor is passed. */ |
| |
| static tree |
| convert_vms_descriptor (tree gnu_type, tree gnu_expr, tree gnu_expr_alt_type, |
| Entity_Id gnat_subprog) |
| { |
| tree desc_type = TREE_TYPE (TREE_TYPE (gnu_expr)); |
| tree desc = build1 (INDIRECT_REF, desc_type, gnu_expr); |
| tree mbo = TYPE_FIELDS (desc_type); |
| const char *mbostr = IDENTIFIER_POINTER (DECL_NAME (mbo)); |
| tree mbmo = TREE_CHAIN (TREE_CHAIN (TREE_CHAIN (mbo))); |
| tree is64bit, gnu_expr32, gnu_expr64; |
| |
| /* If the field name is not MBO, it must be 32-bit and no alternate. |
| Otherwise primary must be 64-bit and alternate 32-bit. */ |
| if (strcmp (mbostr, "MBO") != 0) |
| return convert_vms_descriptor32 (gnu_type, gnu_expr, gnat_subprog); |
| |
| /* Build the test for 64-bit descriptor. */ |
| mbo = build3 (COMPONENT_REF, TREE_TYPE (mbo), desc, mbo, NULL_TREE); |
| mbmo = build3 (COMPONENT_REF, TREE_TYPE (mbmo), desc, mbmo, NULL_TREE); |
| is64bit |
| = build_binary_op (TRUTH_ANDIF_EXPR, integer_type_node, |
| build_binary_op (EQ_EXPR, integer_type_node, |
| convert (integer_type_node, mbo), |
| integer_one_node), |
| build_binary_op (EQ_EXPR, integer_type_node, |
| convert (integer_type_node, mbmo), |
| integer_minus_one_node)); |
| |
| /* Build the 2 possible end results. */ |
| gnu_expr64 = convert_vms_descriptor64 (gnu_type, gnu_expr, gnat_subprog); |
| gnu_expr = fold_convert (gnu_expr_alt_type, gnu_expr); |
| gnu_expr32 = convert_vms_descriptor32 (gnu_type, gnu_expr, gnat_subprog); |
| |
| return build3 (COND_EXPR, gnu_type, is64bit, gnu_expr64, gnu_expr32); |
| } |
| |
| /* Build a stub for the subprogram specified by the GCC tree GNU_SUBPROG |
| and the GNAT node GNAT_SUBPROG. */ |
| |
| void |
| build_function_stub (tree gnu_subprog, Entity_Id gnat_subprog) |
| { |
| tree gnu_subprog_type, gnu_subprog_addr, gnu_subprog_call; |
| tree gnu_stub_param, gnu_param_list, gnu_arg_types, gnu_param; |
| tree gnu_stub_decl = DECL_FUNCTION_STUB (gnu_subprog); |
| tree gnu_body; |
| |
| gnu_subprog_type = TREE_TYPE (gnu_subprog); |
| gnu_param_list = NULL_TREE; |
| |
| begin_subprog_body (gnu_stub_decl); |
| gnat_pushlevel (); |
| |
| start_stmt_group (); |
| |
| /* Loop over the parameters of the stub and translate any of them |
| passed by descriptor into a by reference one. */ |
| for (gnu_stub_param = DECL_ARGUMENTS (gnu_stub_decl), |
| gnu_arg_types = TYPE_ARG_TYPES (gnu_subprog_type); |
| gnu_stub_param; |
| gnu_stub_param = TREE_CHAIN (gnu_stub_param), |
| gnu_arg_types = TREE_CHAIN (gnu_arg_types)) |
| { |
| if (DECL_BY_DESCRIPTOR_P (gnu_stub_param)) |
| gnu_param |
| = convert_vms_descriptor (TREE_VALUE (gnu_arg_types), |
| gnu_stub_param, |
| DECL_PARM_ALT_TYPE (gnu_stub_param), |
| gnat_subprog); |
| else |
| gnu_param = gnu_stub_param; |
| |
| gnu_param_list = tree_cons (NULL_TREE, gnu_param, gnu_param_list); |
| } |
| |
| gnu_body = end_stmt_group (); |
| |
| /* Invoke the internal subprogram. */ |
| gnu_subprog_addr = build1 (ADDR_EXPR, build_pointer_type (gnu_subprog_type), |
| gnu_subprog); |
| gnu_subprog_call = build_call_list (TREE_TYPE (gnu_subprog_type), |
| gnu_subprog_addr, |
| nreverse (gnu_param_list)); |
| |
| /* Propagate the return value, if any. */ |
| if (VOID_TYPE_P (TREE_TYPE (gnu_subprog_type))) |
| append_to_statement_list (gnu_subprog_call, &gnu_body); |
| else |
| append_to_statement_list (build_return_expr (DECL_RESULT (gnu_stub_decl), |
| gnu_subprog_call), |
| &gnu_body); |
| |
| gnat_poplevel (); |
| |
| allocate_struct_function (gnu_stub_decl, false); |
| end_subprog_body (gnu_body, false); |
| } |
| |
| /* Build a type to be used to represent an aliased object whose nominal |
| type is an unconstrained array. This consists of a RECORD_TYPE containing |
| a field of TEMPLATE_TYPE and a field of OBJECT_TYPE, which is an |
| ARRAY_TYPE. If ARRAY_TYPE is that of the unconstrained array, this |
| is used to represent an arbitrary unconstrained object. Use NAME |
| as the name of the record. */ |
| |
| tree |
| build_unc_object_type (tree template_type, tree object_type, tree name) |
| { |
| tree type = make_node (RECORD_TYPE); |
| tree template_field = create_field_decl (get_identifier ("BOUNDS"), |
| template_type, type, 0, 0, 0, 1); |
| tree array_field = create_field_decl (get_identifier ("ARRAY"), object_type, |
| type, 0, 0, 0, 1); |
| |
| TYPE_NAME (type) = name; |
| TYPE_CONTAINS_TEMPLATE_P (type) = 1; |
| finish_record_type (type, |
| chainon (chainon (NULL_TREE, template_field), |
| array_field), |
| 0, false); |
| |
| return type; |
| } |
| |
| /* Same, taking a thin or fat pointer type instead of a template type. */ |
| |
| tree |
| build_unc_object_type_from_ptr (tree thin_fat_ptr_type, tree object_type, |
| tree name) |
| { |
| tree template_type; |
| |
| gcc_assert (TYPE_FAT_OR_THIN_POINTER_P (thin_fat_ptr_type)); |
| |
| template_type |
| = (TYPE_FAT_POINTER_P (thin_fat_ptr_type) |
| ? TREE_TYPE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (thin_fat_ptr_type)))) |
| : TREE_TYPE (TYPE_FIELDS (TREE_TYPE (thin_fat_ptr_type)))); |
| return build_unc_object_type (template_type, object_type, name); |
| } |
| |
| /* Shift the component offsets within an unconstrained object TYPE to make it |
| suitable for use as a designated type for thin pointers. */ |
| |
| void |
| shift_unc_components_for_thin_pointers (tree type) |
| { |
| /* Thin pointer values designate the ARRAY data of an unconstrained object, |
| allocated past the BOUNDS template. The designated type is adjusted to |
| have ARRAY at position zero and the template at a negative offset, so |
| that COMPONENT_REFs on (*thin_ptr) designate the proper location. */ |
| |
| tree bounds_field = TYPE_FIELDS (type); |
| tree array_field = TREE_CHAIN (TYPE_FIELDS (type)); |
| |
| DECL_FIELD_OFFSET (bounds_field) |
| = size_binop (MINUS_EXPR, size_zero_node, byte_position (array_field)); |
| |
| DECL_FIELD_OFFSET (array_field) = size_zero_node; |
| DECL_FIELD_BIT_OFFSET (array_field) = bitsize_zero_node; |
| } |
| |
| /* Update anything previously pointing to OLD_TYPE to point to NEW_TYPE. In |
| the normal case this is just two adjustments, but we have more to do |
| if NEW is an UNCONSTRAINED_ARRAY_TYPE. */ |
| |
| void |
| update_pointer_to (tree old_type, tree new_type) |
| { |
| tree ptr = TYPE_POINTER_TO (old_type); |
| tree ref = TYPE_REFERENCE_TO (old_type); |
| tree ptr1, ref1; |
| tree type; |
| |
| /* If this is the main variant, process all the other variants first. */ |
| if (TYPE_MAIN_VARIANT (old_type) == old_type) |
| for (type = TYPE_NEXT_VARIANT (old_type); type; |
| type = TYPE_NEXT_VARIANT (type)) |
| update_pointer_to (type, new_type); |
| |
| /* If no pointer or reference, we are done. */ |
| if (!ptr && !ref) |
| return; |
| |
| /* Merge the old type qualifiers in the new type. |
| |
| Each old variant has qualifiers for specific reasons, and the new |
| designated type as well. Each set of qualifiers represents useful |
| information grabbed at some point, and merging the two simply unifies |
| these inputs into the final type description. |
| |
| Consider for instance a volatile type frozen after an access to constant |
| type designating it. After the designated type freeze, we get here with a |
| volatile new_type and a dummy old_type with a readonly variant, created |
| when the access type was processed. We shall make a volatile and readonly |
| designated type, because that's what it really is. |
| |
| We might also get here for a non-dummy old_type variant with different |
| qualifiers than the new_type ones, for instance in some cases of pointers |
| to private record type elaboration (see the comments around the call to |
| this routine from gnat_to_gnu_entity/E_Access_Type). We have to merge the |
| qualifiers in those cases too, to avoid accidentally discarding the |
| initial set, and will often end up with old_type == new_type then. */ |
| new_type = build_qualified_type (new_type, |
| TYPE_QUALS (old_type) |
| | TYPE_QUALS (new_type)); |
| |
| /* If the new type and the old one are identical, there is nothing to |
| update. */ |
| if (old_type == new_type) |
| return; |
| |
| /* Otherwise, first handle the simple case. */ |
| if (TREE_CODE (new_type) != UNCONSTRAINED_ARRAY_TYPE) |
| { |
| TYPE_POINTER_TO (new_type) = ptr; |
| TYPE_REFERENCE_TO (new_type) = ref; |
| |
| for (; ptr; ptr = TYPE_NEXT_PTR_TO (ptr)) |
| for (ptr1 = TYPE_MAIN_VARIANT (ptr); ptr1; |
| ptr1 = TYPE_NEXT_VARIANT (ptr1)) |
| TREE_TYPE (ptr1) = new_type; |
| |
| for (; ref; ref = TYPE_NEXT_REF_TO (ref)) |
| for (ref1 = TYPE_MAIN_VARIANT (ref); ref1; |
| ref1 = TYPE_NEXT_VARIANT (ref1)) |
| TREE_TYPE (ref1) = new_type; |
| } |
| |
| /* Now deal with the unconstrained array case. In this case the "pointer" |
| is actually a RECORD_TYPE where both fields are pointers to dummy nodes. |
| Turn them into pointers to the correct types using update_pointer_to. */ |
| else if (TREE_CODE (ptr) != RECORD_TYPE || !TYPE_IS_FAT_POINTER_P (ptr)) |
| gcc_unreachable (); |
| |
| else |
| { |
| tree new_obj_rec = TYPE_OBJECT_RECORD_TYPE (new_type); |
| tree array_field = TYPE_FIELDS (ptr); |
| tree bounds_field = TREE_CHAIN (TYPE_FIELDS (ptr)); |
| tree new_ptr = TYPE_POINTER_TO (new_type); |
| tree new_ref; |
| tree var; |
| |
| /* Make pointers to the dummy template point to the real template. */ |
| update_pointer_to |
| (TREE_TYPE (TREE_TYPE (bounds_field)), |
| TREE_TYPE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (new_ptr))))); |
| |
| /* The references to the template bounds present in the array type |
| are made through a PLACEHOLDER_EXPR of type new_ptr. Since we |
| are updating ptr to make it a full replacement for new_ptr as |
| pointer to new_type, we must rework the PLACEHOLDER_EXPR so as |
| to make it of type ptr. */ |
| new_ref = build3 (COMPONENT_REF, TREE_TYPE (bounds_field), |
| build0 (PLACEHOLDER_EXPR, ptr), |
| bounds_field, NULL_TREE); |
| |
| /* Create the new array for the new PLACEHOLDER_EXPR and make |
| pointers to the dummy array point to it. |
| |
| ??? This is now the only use of substitute_in_type, |
| which is a very "heavy" routine to do this, so it |
| should be replaced at some point. */ |
| update_pointer_to |
| (TREE_TYPE (TREE_TYPE (array_field)), |
| substitute_in_type (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (new_ptr))), |
| TREE_CHAIN (TYPE_FIELDS (new_ptr)), new_ref)); |
| |
| /* Make ptr the pointer to new_type. */ |
| TYPE_POINTER_TO (new_type) = TYPE_REFERENCE_TO (new_type) |
| = TREE_TYPE (new_type) = ptr; |
| |
| for (var = TYPE_MAIN_VARIANT (ptr); var; var = TYPE_NEXT_VARIANT (var)) |
| SET_TYPE_UNCONSTRAINED_ARRAY (var, new_type); |
| |
| /* Now handle updating the allocation record, what the thin pointer |
| points to. Update all pointers from the old record into the new |
| one, update the type of the array field, and recompute the size. */ |
| update_pointer_to (TYPE_OBJECT_RECORD_TYPE (old_type), new_obj_rec); |
| |
| TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (new_obj_rec))) |
| = TREE_TYPE (TREE_TYPE (array_field)); |
| |
| /* The size recomputation needs to account for alignment constraints, so |
| we let layout_type work it out. This will reset the field offsets to |
| what they would be in a regular record, so we shift them back to what |
| we want them to be for a thin pointer designated type afterwards. */ |
| DECL_SIZE (TYPE_FIELDS (new_obj_rec)) = 0; |
| DECL_SIZE (TREE_CHAIN (TYPE_FIELDS (new_obj_rec))) = 0; |
| TYPE_SIZE (new_obj_rec) = 0; |
| layout_type (new_obj_rec); |
| |
| shift_unc_components_for_thin_pointers (new_obj_rec); |
| |
| /* We are done, at last. */ |
| rest_of_record_type_compilation (ptr); |
| } |
| } |
| |
| /* Convert EXPR, a pointer to a constrained array, into a pointer to an |
| unconstrained one. This involves making or finding a template. */ |
| |
| static tree |
| convert_to_fat_pointer (tree type, tree expr) |
| { |
| tree template_type = TREE_TYPE (TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (type)))); |
| tree p_array_type = TREE_TYPE (TYPE_FIELDS (type)); |
| tree etype = TREE_TYPE (expr); |
| tree template; |
| |
| /* If EXPR is null, make a fat pointer that contains null pointers to the |
| template and array. */ |
| if (integer_zerop (expr)) |
| return |
| gnat_build_constructor |
| (type, |
| tree_cons (TYPE_FIELDS (type), |
| convert (p_array_type, expr), |
| tree_cons (TREE_CHAIN (TYPE_FIELDS (type)), |
| convert (build_pointer_type (template_type), |
| expr), |
| NULL_TREE))); |
| |
| /* If EXPR is a thin pointer, make template and data from the record.. */ |
| else if (TYPE_THIN_POINTER_P (etype)) |
| { |
| tree fields = TYPE_FIELDS (TREE_TYPE (etype)); |
| |
| expr = save_expr (expr); |
| if (TREE_CODE (expr) == ADDR_EXPR) |
| expr = TREE_OPERAND (expr, 0); |
| else |
| expr = build1 (INDIRECT_REF, TREE_TYPE (etype), expr); |
| |
| template = build_component_ref (expr, NULL_TREE, fields, false); |
| expr = build_unary_op (ADDR_EXPR, NULL_TREE, |
| build_component_ref (expr, NULL_TREE, |
| TREE_CHAIN (fields), false)); |
| } |
| |
| /* Otherwise, build the constructor for the template. */ |
| else |
| template = build_template (template_type, TREE_TYPE (etype), expr); |
| |
| /* The final result is a constructor for the fat pointer. |
| |
| If EXPR is an argument of a foreign convention subprogram, the type it |
| points to is directly the component type. In this case, the expression |
| type may not match the corresponding FIELD_DECL type at this point, so we |
| call "convert" here to fix that up if necessary. This type consistency is |
| required, for instance because it ensures that possible later folding of |
| COMPONENT_REFs against this constructor always yields something of the |
| same type as the initial reference. |
| |
| Note that the call to "build_template" above is still fine because it |
| will only refer to the provided TEMPLATE_TYPE in this case. */ |
| return |
| gnat_build_constructor |
| (type, |
| tree_cons (TYPE_FIELDS (type), |
| convert (p_array_type, expr), |
| tree_cons (TREE_CHAIN (TYPE_FIELDS (type)), |
| build_unary_op (ADDR_EXPR, NULL_TREE, template), |
| NULL_TREE))); |
| } |
| |
| /* Convert to a thin pointer type, TYPE. The only thing we know how to convert |
| is something that is a fat pointer, so convert to it first if it EXPR |
| is not already a fat pointer. */ |
| |
| static tree |
| convert_to_thin_pointer (tree type, tree expr) |
| { |
| if (!TYPE_FAT_POINTER_P (TREE_TYPE (expr))) |
| expr |
| = convert_to_fat_pointer |
| (TREE_TYPE (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type))), expr); |
| |
| /* We get the pointer to the data and use a NOP_EXPR to make it the |
| proper GCC type. */ |
| expr = build_component_ref (expr, NULL_TREE, TYPE_FIELDS (TREE_TYPE (expr)), |
| false); |
| expr = build1 (NOP_EXPR, type, expr); |
| |
| return expr; |
| } |
| |
| /* Create an expression whose value is that of EXPR, |
| converted to type TYPE. The TREE_TYPE of the value |
| is always TYPE. This function implements all reasonable |
| conversions; callers should filter out those that are |
| not permitted by the language being compiled. */ |
| |
| tree |
| convert (tree type, tree expr) |
| { |
| enum tree_code code = TREE_CODE (type); |
| tree etype = TREE_TYPE (expr); |
| enum tree_code ecode = TREE_CODE (etype); |
| |
| /* If EXPR is already the right type, we are done. */ |
| if (type == etype) |
| return expr; |
| |
| /* If both input and output have padding and are of variable size, do this |
| as an unchecked conversion. Likewise if one is a mere variant of the |
| other, so we avoid a pointless unpad/repad sequence. */ |
| else if (code == RECORD_TYPE && ecode == RECORD_TYPE |
| && TYPE_IS_PADDING_P (type) && TYPE_IS_PADDING_P (etype) |
| && (!TREE_CONSTANT (TYPE_SIZE (type)) |
| || !TREE_CONSTANT (TYPE_SIZE (etype)) |
| || gnat_types_compatible_p (type, etype) |
| || TYPE_NAME (TREE_TYPE (TYPE_FIELDS (type))) |
| == TYPE_NAME (TREE_TYPE (TYPE_FIELDS (etype))))) |
| ; |
| |
| /* If the output type has padding, convert to the inner type and |
| make a constructor to build the record. */ |
| else if (code == RECORD_TYPE && TYPE_IS_PADDING_P (type)) |
| { |
| /* If we previously converted from another type and our type is |
| of variable size, remove the conversion to avoid the need for |
| variable-size temporaries. Likewise for a conversion between |
| original and packable version. */ |
| if (TREE_CODE (expr) == VIEW_CONVERT_EXPR |
| && (!TREE_CONSTANT (TYPE_SIZE (type)) |
| || (ecode == RECORD_TYPE |
| && TYPE_NAME (etype) |
| == TYPE_NAME (TREE_TYPE (TREE_OPERAND (expr, 0)))))) |
| expr = TREE_OPERAND (expr, 0); |
| |
| /* If we are just removing the padding from expr, convert the original |
| object if we have variable size in order to avoid the need for some |
| variable-size temporaries. Likewise if the padding is a mere variant |
| of the other, so we avoid a pointless unpad/repad sequence. */ |
| if (TREE_CODE (expr) == COMPONENT_REF |
| && TREE_CODE (TREE_TYPE (TREE_OPERAND (expr, 0))) == RECORD_TYPE |
| && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (expr, 0))) |
| && (!TREE_CONSTANT (TYPE_SIZE (type)) |
| || gnat_types_compatible_p (type, |
| TREE_TYPE (TREE_OPERAND (expr, 0))) |
| || (ecode == RECORD_TYPE |
| && TYPE_NAME (etype) |
| == TYPE_NAME (TREE_TYPE (TYPE_FIELDS (type)))))) |
| return convert (type, TREE_OPERAND (expr, 0)); |
| |
| /* If the result type is a padded type with a self-referentially-sized |
| field and the expression type is a record, do this as an |
| unchecked conversion. */ |
| else if (TREE_CODE (etype) == RECORD_TYPE |
| && CONTAINS_PLACEHOLDER_P (DECL_SIZE (TYPE_FIELDS (type)))) |
| return unchecked_convert (type, expr, false); |
| |
| else |
| return |
| gnat_build_constructor (type, |
| tree_cons (TYPE_FIELDS (type), |
| convert (TREE_TYPE |
| (TYPE_FIELDS (type)), |
| expr), |
| NULL_TREE)); |
| } |
| |
| /* If the input type has padding, remove it and convert to the output type. |
| The conditions ordering is arranged to ensure that the output type is not |
| a padding type here, as it is not clear whether the conversion would |
| always be correct if this was to happen. */ |
| else if (ecode == RECORD_TYPE && TYPE_IS_PADDING_P (etype)) |
| { |
| tree unpadded; |
| |
| /* If we have just converted to this padded type, just get the |
| inner expression. */ |
| if (TREE_CODE (expr) == CONSTRUCTOR |
| && !VEC_empty (constructor_elt, CONSTRUCTOR_ELTS (expr)) |
| && VEC_index (constructor_elt, CONSTRUCTOR_ELTS (expr), 0)->index |
| == TYPE_FIELDS (etype)) |
| unpadded |
| = VEC_index (constructor_elt, CONSTRUCTOR_ELTS (expr), 0)->value; |
| |
| /* Otherwise, build an explicit component reference. */ |
| else |
| unpadded |
| = build_component_ref (expr, NULL_TREE, TYPE_FIELDS (etype), false); |
| |
| return convert (type, unpadded); |
| } |
| |
| /* If the input is a biased type, adjust first. */ |
| if (ecode == INTEGER_TYPE && TYPE_BIASED_REPRESENTATION_P (etype)) |
| return convert (type, fold_build2 (PLUS_EXPR, TREE_TYPE (etype), |
| fold_convert (TREE_TYPE (etype), |
| expr), |
| TYPE_MIN_VALUE (etype))); |
| |
| /* If the input is a justified modular type, we need to extract the actual |
| object before converting it to any other type with the exceptions of an |
| unconstrained array or of a mere type variant. It is useful to avoid the |
| extraction and conversion in the type variant case because it could end |
| up replacing a VAR_DECL expr by a constructor and we might be about the |
| take the address of the result. */ |
| if (ecode == RECORD_TYPE && TYPE_JUSTIFIED_MODULAR_P (etype) |
| && code != UNCONSTRAINED_ARRAY_TYPE |
| && TYPE_MAIN_VARIANT (type) != TYPE_MAIN_VARIANT (etype)) |
| return convert (type, build_component_ref (expr, NULL_TREE, |
| TYPE_FIELDS (etype), false)); |
| |
| /* If converting to a type that contains a template, convert to the data |
| type and then build the template. */ |
| if (code == RECORD_TYPE && TYPE_CONTAINS_TEMPLATE_P (type)) |
| { |
| tree obj_type = TREE_TYPE (TREE_CHAIN (TYPE_FIELDS (type))); |
| |
| /* If the source already has a template, get a reference to the |
| associated array only, as we are going to rebuild a template |
| for the target type anyway. */ |
| expr = maybe_unconstrained_array (expr); |
| |
| return |
| gnat_build_constructor |
| (type, |
| tree_cons (TYPE_FIELDS (type), |
| build_template (TREE_TYPE (TYPE_FIELDS (type)), |
| obj_type, NULL_TREE), |
| tree_cons (TREE_CHAIN (TYPE_FIELDS (type)), |
| convert (obj_type, expr), NULL_TREE))); |
| } |
| |
| /* There are some special cases of expressions that we process |
| specially. */ |
| switch (TREE_CODE (expr)) |
| { |
| case ERROR_MARK: |
| return expr; |
| |
| case NULL_EXPR: |
| /* Just set its type here. For TRANSFORM_EXPR, we will do the actual |
| conversion in gnat_expand_expr. NULL_EXPR does not represent |
| and actual value, so no conversion is needed. */ |
| expr = copy_node (expr); |
| TREE_TYPE (expr) = type; |
| return expr; |
| |
| case STRING_CST: |
| /* If we are converting a STRING_CST to another constrained array type, |
| just make a new one in the proper type. */ |
| if (code == ecode && AGGREGATE_TYPE_P (etype) |
| && !(TREE_CODE (TYPE_SIZE (etype)) == INTEGER_CST |
| && TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST)) |
| { |
| expr = copy_node (expr); |
| TREE_TYPE (expr) = type; |
| return expr; |
| } |
| break; |
| |
| case CONSTRUCTOR: |
| /* If we are converting a CONSTRUCTOR to a mere variant type, just make |
| a new one in the proper type. */ |
| if (code == ecode && gnat_types_compatible_p (type, etype)) |
| { |
| expr = copy_node (expr); |
| TREE_TYPE (expr) = type; |
| return expr; |
| } |
| |
| /* Likewise for a conversion between original and packable version, but |
| we have to work harder in order to preserve type consistency. */ |
| if (code == ecode |
| && code == RECORD_TYPE |
| && TYPE_NAME (type) == TYPE_NAME (etype)) |
| { |
| VEC(constructor_elt,gc) *e = CONSTRUCTOR_ELTS (expr); |
| unsigned HOST_WIDE_INT len = VEC_length (constructor_elt, e); |
| VEC(constructor_elt,gc) *v = VEC_alloc (constructor_elt, gc, len); |
| tree efield = TYPE_FIELDS (etype), field = TYPE_FIELDS (type); |
| unsigned HOST_WIDE_INT idx; |
| tree index, value; |
| |
| FOR_EACH_CONSTRUCTOR_ELT(e, idx, index, value) |
| { |
| constructor_elt *elt = VEC_quick_push (constructor_elt, v, NULL); |
| /* We expect only simple constructors. Otherwise, punt. */ |
| if (!(index == efield || index == DECL_ORIGINAL_FIELD (efield))) |
| break; |
| elt->index = field; |
| elt->value = convert (TREE_TYPE (field), value); |
| efield = TREE_CHAIN (efield); |
| field = TREE_CHAIN (field); |
| } |
| |
| if (idx == len) |
| { |
| expr = copy_node (expr); |
| TREE_TYPE (expr) = type; |
| CONSTRUCTOR_ELTS (expr) = v; |
| return expr; |
| } |
| } |
| break; |
| |
| case UNCONSTRAINED_ARRAY_REF: |
| /* Convert this to the type of the inner array by getting the address of |
| the array from the template. */ |
| expr = build_unary_op (INDIRECT_REF, NULL_TREE, |
| build_component_ref (TREE_OPERAND (expr, 0), |
| get_identifier ("P_ARRAY"), |
| NULL_TREE, false)); |
| etype = TREE_TYPE (expr); |
| ecode = TREE_CODE (etype); |
| break; |
| |
| case VIEW_CONVERT_EXPR: |
| { |
| /* GCC 4.x is very sensitive to type consistency overall, and view |
| conversions thus are very frequent. Even though just "convert"ing |
| the inner operand to the output type is fine in most cases, it |
| might expose unexpected input/output type mismatches in special |
| circumstances so we avoid such recursive calls when we can. */ |
| tree op0 = TREE_OPERAND (expr, 0); |
| |
| /* If we are converting back to the original type, we can just |
| lift the input conversion. This is a common occurrence with |
| switches back-and-forth amongst type variants. */ |
| if (type == TREE_TYPE (op0)) |
| return op0; |
| |
| /* Otherwise, if we're converting between two aggregate types, we |
| might be allowed to substitute the VIEW_CONVERT_EXPR target type |
| in place or to just convert the inner expression. */ |
| if (AGGREGATE_TYPE_P (type) && AGGREGATE_TYPE_P (etype)) |
| { |
| /* If we are converting between mere variants, we can just |
| substitute the VIEW_CONVERT_EXPR in place. */ |
| if (gnat_types_compatible_p (type, etype)) |
| return build1 (VIEW_CONVERT_EXPR, type, op0); |
| |
| /* Otherwise, we may just bypass the input view conversion unless |
| one of the types is a fat pointer, which is handled by |
| specialized code below which relies on exact type matching. */ |
| else if (!TYPE_FAT_POINTER_P (type) && !TYPE_FAT_POINTER_P (etype)) |
| return convert (type, op0); |
| } |
| } |
| break; |
| |
| case INDIRECT_REF: |
| /* If both types are record types, just convert the pointer and |
| make a new INDIRECT_REF. |
| |
| ??? Disable this for now since it causes problems with the |
| code in build_binary_op for MODIFY_EXPR which wants to |
| strip off conversions. But that code really is a mess and |
| we need to do this a much better way some time. */ |
| if (0 |
| && (TREE_CODE (type) == RECORD_TYPE |
| || TREE_CODE (type) == UNION_TYPE) |
| && (TREE_CODE (etype) == RECORD_TYPE |
| || TREE_CODE (etype) == UNION_TYPE) |
| && !TYPE_FAT_POINTER_P (type) && !TYPE_FAT_POINTER_P (etype)) |
| return build_unary_op (INDIRECT_REF, NULL_TREE, |
| convert (build_pointer_type (type), |
| TREE_OPERAND (expr, 0))); |
| break; |
| |
| default: |
| break; |
| } |
| |
| /* Check for converting to a pointer to an unconstrained array. */ |
| if (TYPE_FAT_POINTER_P (type) && !TYPE_FAT_POINTER_P (etype)) |
| return convert_to_fat_pointer (type, expr); |
| |
| /* If we are converting between two aggregate types that are mere |
| variants, just make a VIEW_CONVERT_EXPR. */ |
| else if (code == ecode |
| && AGGREGATE_TYPE_P (type) |
| && gnat_types_compatible_p (type, etype)) |
| return build1 (VIEW_CONVERT_EXPR, type, expr); |
| |
| /* In all other cases of related types, make a NOP_EXPR. */ |
| else if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (etype) |
| || (code == INTEGER_CST && ecode == INTEGER_CST |
| && (type == TREE_TYPE (etype) || etype == TREE_TYPE (type)))) |
| return fold_convert (type, expr); |
| |
| switch (code) |
| { |
| case VOID_TYPE: |
| return fold_build1 (CONVERT_EXPR, type, expr); |
| |
| case INTEGER_TYPE: |
| if (TYPE_HAS_ACTUAL_BOUNDS_P (type) |
| && (ecode == ARRAY_TYPE || ecode == UNCONSTRAINED_ARRAY_TYPE |
| || (ecode == RECORD_TYPE && TYPE_CONTAINS_TEMPLATE_P (etype)))) |
| return unchecked_convert (type, expr, false); |
| else if (TYPE_BIASED_REPRESENTATION_P (type)) |
| return fold_convert (type, |
| fold_build2 (MINUS_EXPR, TREE_TYPE (type), |
| convert (TREE_TYPE (type), expr), |
| TYPE_MIN_VALUE (type))); |
| |
| /* ... fall through ... */ |
| |
| case ENUMERAL_TYPE: |
| case BOOLEAN_TYPE: |
| /* If we are converting an additive expression to an integer type |
| with lower precision, be wary of the optimization that can be |
| applied by convert_to_integer. There are 2 problematic cases: |
| - if the first operand was originally of a biased type, |
| because we could be recursively called to convert it |
| to an intermediate type and thus rematerialize the |
| additive operator endlessly, |
| - if the expression contains a placeholder, because an |
| intermediate conversion that changes the sign could |
| be inserted and thus introduce an artificial overflow |
| at compile time when the placeholder is substituted. */ |
| if (code == INTEGER_TYPE |
| && ecode == INTEGER_TYPE |
| && TYPE_PRECISION (type) < TYPE_PRECISION (etype) |
| && (TREE_CODE (expr) == PLUS_EXPR || TREE_CODE (expr) == MINUS_EXPR)) |
| { |
| tree op0 = get_unwidened (TREE_OPERAND (expr, 0), type); |
| |
| if ((TREE_CODE (TREE_TYPE (op0)) == INTEGER_TYPE |
| && TYPE_BIASED_REPRESENTATION_P (TREE_TYPE (op0))) |
| || CONTAINS_PLACEHOLDER_P (expr)) |
| return build1 (NOP_EXPR, type, expr); |
| } |
| |
| return fold (convert_to_integer (type, expr)); |
| |
| case POINTER_TYPE: |
| case REFERENCE_TYPE: |
| /* If converting between two pointers to records denoting |
| both a template and type, adjust if needed to account |
| for any differing offsets, since one might be negative. */ |
| if (TYPE_THIN_POINTER_P (etype) && TYPE_THIN_POINTER_P (type)) |
| { |
| tree bit_diff |
| = size_diffop (bit_position (TYPE_FIELDS (TREE_TYPE (etype))), |
| bit_position (TYPE_FIELDS (TREE_TYPE (type)))); |
| tree byte_diff = size_binop (CEIL_DIV_EXPR, bit_diff, |
| sbitsize_int (BITS_PER_UNIT)); |
| |
| expr = build1 (NOP_EXPR, type, expr); |
| TREE_CONSTANT (expr) = TREE_CONSTANT (TREE_OPERAND (expr, 0)); |
| if (integer_zerop (byte_diff)) |
| return expr; |
| |
| return build_binary_op (POINTER_PLUS_EXPR, type, expr, |
| fold (convert (sizetype, byte_diff))); |
| } |
| |
| /* If converting to a thin pointer, handle specially. */ |
| if (TYPE_THIN_POINTER_P (type) |
| && TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type))) |
| return convert_to_thin_pointer (type, expr); |
| |
| /* If converting fat pointer to normal pointer, get the pointer to the |
| array and then convert it. */ |
| else if (TYPE_FAT_POINTER_P (etype)) |
| expr = build_component_ref (expr, get_identifier ("P_ARRAY"), |
| NULL_TREE, false); |
| |
| return fold (convert_to_pointer (type, expr)); |
| |
| case REAL_TYPE: |
| return fold (convert_to_real (type, expr)); |
| |
| case RECORD_TYPE: |
| if (TYPE_JUSTIFIED_MODULAR_P (type) && !AGGREGATE_TYPE_P (etype)) |
| return |
| gnat_build_constructor |
| (type, tree_cons (TYPE_FIELDS (type), |
| convert (TREE_TYPE (TYPE_FIELDS (type)), expr), |
| NULL_TREE)); |
| |
| /* ... fall through ... */ |
| |
| case ARRAY_TYPE: |
| /* In these cases, assume the front-end has validated the conversion. |
| If the conversion is valid, it will be a bit-wise conversion, so |
| it can be viewed as an unchecked conversion. */ |
| return unchecked_convert (type, expr, false); |
| |
| case UNION_TYPE: |
| /* This is a either a conversion between a tagged type and some |
| subtype, which we have to mark as a UNION_TYPE because of |
| overlapping fields or a conversion of an Unchecked_Union. */ |
| return unchecked_convert (type, expr, false); |
| |
| case UNCONSTRAINED_ARRAY_TYPE: |
| /* If EXPR is a constrained array, take its address, convert it to a |
| fat pointer, and then dereference it. Likewise if EXPR is a |
| record containing both a template and a constrained array. |
| Note that a record representing a justified modular type |
| always represents a packed constrained array. */ |
| if (ecode == ARRAY_TYPE |
| || (ecode == INTEGER_TYPE && TYPE_HAS_ACTUAL_BOUNDS_P (etype)) |
| || (ecode == RECORD_TYPE && TYPE_CONTAINS_TEMPLATE_P (etype)) |
| || (ecode == RECORD_TYPE && TYPE_JUSTIFIED_MODULAR_P (etype))) |
| return |
| build_unary_op |
| (INDIRECT_REF, NULL_TREE, |
| convert_to_fat_pointer (TREE_TYPE (type), |
| build_unary_op (ADDR_EXPR, |
| NULL_TREE, expr))); |
| |
| /* Do something very similar for converting one unconstrained |
| array to another. */ |
| else if (ecode == UNCONSTRAINED_ARRAY_TYPE) |
| return |
| build_unary_op (INDIRECT_REF, NULL_TREE, |
| convert (TREE_TYPE (type), |
| build_unary_op (ADDR_EXPR, |
| NULL_TREE, expr))); |
| else |
| gcc_unreachable (); |
| |
| case COMPLEX_TYPE: |
| return fold (convert_to_complex (type, expr)); |
| |
| default: |
| gcc_unreachable (); |
| } |
| } |
| |
| /* Remove all conversions that are done in EXP. This includes converting |
| from a padded type or to a justified modular type. If TRUE_ADDRESS |
| is true, always return the address of the containing object even if |
| the address is not bit-aligned. */ |
| |
| tree |
| remove_conversions (tree exp, bool true_address) |
| { |
| switch (TREE_CODE (exp)) |
| { |
| case CONSTRUCTOR: |
| if (true_address |
| && TREE_CODE (TREE_TYPE (exp)) == RECORD_TYPE |
| && TYPE_JUSTIFIED_MODULAR_P (TREE_TYPE (exp))) |
| return |
| remove_conversions (VEC_index (constructor_elt, |
| CONSTRUCTOR_ELTS (exp), 0)->value, |
| true); |
| break; |
| |
| case COMPONENT_REF: |
| if (TREE_CODE (TREE_TYPE (TREE_OPERAND (exp, 0))) == RECORD_TYPE |
| && TYPE_IS_PADDING_P (TREE_TYPE (TREE_OPERAND (exp, 0)))) |
| return remove_conversions (TREE_OPERAND (exp, 0), true_address); |
| break; |
| |
| case VIEW_CONVERT_EXPR: case NON_LVALUE_EXPR: |
| CASE_CONVERT: |
| return remove_conversions (TREE_OPERAND (exp, 0), true_address); |
| |
| default: |
| break; |
| } |
| |
| return exp; |
| } |
| |
| /* If EXP's type is an UNCONSTRAINED_ARRAY_TYPE, return an expression that |
| refers to the underlying array. If its type has TYPE_CONTAINS_TEMPLATE_P, |
| likewise return an expression pointing to the underlying array. */ |
| |
| tree |
| maybe_unconstrained_array (tree exp) |
| { |
| enum tree_code code = TREE_CODE (exp); |
| tree new; |
| |
| switch (TREE_CODE (TREE_TYPE (exp))) |
| { |
| case UNCONSTRAINED_ARRAY_TYPE: |
| if (code == UNCONSTRAINED_ARRAY_REF) |
| { |
| new |
| = build_unary_op (INDIRECT_REF, NULL_TREE, |
| build_component_ref (TREE_OPERAND (exp, 0), |
| get_identifier ("P_ARRAY"), |
| NULL_TREE, false)); |
| TREE_READONLY (new) = TREE_STATIC (new) = TREE_READONLY (exp); |
| return new; |
| } |
| |
| else if (code == NULL_EXPR) |
| return build1 (NULL_EXPR, |
| TREE_TYPE (TREE_TYPE (TYPE_FIELDS |
| (TREE_TYPE (TREE_TYPE (exp))))), |
| TREE_OPERAND (exp, 0)); |
| |
| case RECORD_TYPE: |
| /* If this is a padded type, convert to the unpadded type and see if |
| it contains a template. */ |
| if (TYPE_IS_PADDING_P (TREE_TYPE (exp))) |
| { |
| new = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (exp))), exp); |
| if (TREE_CODE (TREE_TYPE (new)) == RECORD_TYPE |
| && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (new))) |
| return |
| build_component_ref (new, NULL_TREE, |
| TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (new))), |
| 0); |
| } |
| else if (TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (exp))) |
| return |
| build_component_ref (exp, NULL_TREE, |
| TREE_CHAIN (TYPE_FIELDS (TREE_TYPE (exp))), 0); |
| break; |
| |
| default: |
| break; |
| } |
| |
| return exp; |
| } |
| |
| /* Return true if EXPR is an expression that can be folded as an operand |
| of a VIEW_CONVERT_EXPR. See the head comment of unchecked_convert for |
| the rationale. */ |
| |
| static bool |
| can_fold_for_view_convert_p (tree expr) |
| { |
| tree t1, t2; |
| |
| /* The folder will fold NOP_EXPRs between integral types with the same |
| precision (in the middle-end's sense). We cannot allow it if the |
| types don't have the same precision in the Ada sense as well. */ |
| if (TREE_CODE (expr) != NOP_EXPR) |
| return true; |
| |
| t1 = TREE_TYPE (expr); |
| t2 = TREE_TYPE (TREE_OPERAND (expr, 0)); |
| |
| /* Defer to the folder for non-integral conversions. */ |
| if (!(INTEGRAL_TYPE_P (t1) && INTEGRAL_TYPE_P (t2))) |
| return true; |
| |
| /* Only fold conversions that preserve both precisions. */ |
| if (TYPE_PRECISION (t1) == TYPE_PRECISION (t2) |
| && operand_equal_p (rm_size (t1), rm_size (t2), 0)) |
| return true; |
| |
| return false; |
| } |
| |
| /* Return an expression that does an unchecked conversion of EXPR to TYPE. |
| If NOTRUNC_P is true, truncation operations should be suppressed. |
| |
| Special care is required with (source or target) integral types whose |
| precision is not equal to their size, to make sure we fetch or assign |
| the value bits whose location might depend on the endianness, e.g. |
| |
| Rmsize : constant := 8; |
| subtype Int is Integer range 0 .. 2 ** Rmsize - 1; |
| |
| type Bit_Array is array (1 .. Rmsize) of Boolean; |
| pragma Pack (Bit_Array); |
| |
| function To_Bit_Array is new Unchecked_Conversion (Int, Bit_Array); |
| |
| Value : Int := 2#1000_0001#; |
| Vbits : Bit_Array := To_Bit_Array (Value); |
| |
| we expect the 8 bits at Vbits'Address to always contain Value, while |
| their original location depends on the endianness, at Value'Address |
| on a little-endian architecture but not on a big-endian one. |
| |
| ??? There is a problematic discrepancy between what is called precision |
| here (and more generally throughout gigi) for integral types and what is |
| called precision in the middle-end. In the former case it's the RM size |
| as given by TYPE_RM_SIZE (or rm_size) whereas it's TYPE_PRECISION in the |
| latter case, the hitch being that they are not equal when they matter, |
| that is when the number of value bits is not equal to the type's size: |
| TYPE_RM_SIZE does give the number of value bits but TYPE_PRECISION is set |
| to the size. The sole exception are BOOLEAN_TYPEs for which both are 1. |
| |
| The consequence is that gigi must duplicate code bridging the gap between |
| the type's size and its precision that exists for TYPE_PRECISION in the |
| middle-end, because the latter knows nothing about TYPE_RM_SIZE, and be |
| wary of transformations applied in the middle-end based on TYPE_PRECISION |
| because this value doesn't reflect the actual precision for Ada. */ |
| |
| tree |
| unchecked_convert (tree type, tree expr, bool notrunc_p) |
| { |
| tree etype = TREE_TYPE (expr); |
| |
| /* If the expression is already the right type, we are done. */ |
| if (etype == type) |
| return expr; |
| |
| /* If both types types are integral just do a normal conversion. |
| Likewise for a conversion to an unconstrained array. */ |
| if ((((INTEGRAL_TYPE_P (type) |
| && !(TREE_CODE (type) == INTEGER_TYPE |
| && TYPE_VAX_FLOATING_POINT_P (type))) |
| || (POINTER_TYPE_P (type) && ! TYPE_THIN_POINTER_P (type)) |
| || (TREE_CODE (type) == RECORD_TYPE |
| && TYPE_JUSTIFIED_MODULAR_P (type))) |
| && ((INTEGRAL_TYPE_P (etype) |
| && !(TREE_CODE (etype) == INTEGER_TYPE |
| && TYPE_VAX_FLOATING_POINT_P (etype))) |
| || (POINTER_TYPE_P (etype) && !TYPE_THIN_POINTER_P (etype)) |
| || (TREE_CODE (etype) == RECORD_TYPE |
| && TYPE_JUSTIFIED_MODULAR_P (etype)))) |
| || TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE) |
| { |
| if (TREE_CODE (etype) == INTEGER_TYPE |
| && TYPE_BIASED_REPRESENTATION_P (etype)) |
| { |
| tree ntype = copy_type (etype); |
| TYPE_BIASED_REPRESENTATION_P (ntype) = 0; |
| TYPE_MAIN_VARIANT (ntype) = ntype; |
| expr = build1 (NOP_EXPR, ntype, expr); |
| } |
| |
| if (TREE_CODE (type) == INTEGER_TYPE |
| && TYPE_BIASED_REPRESENTATION_P (type)) |
| { |
| tree rtype = copy_type (type); |
| TYPE_BIASED_REPRESENTATION_P (rtype) = 0; |
| TYPE_MAIN_VARIANT (rtype) = rtype; |
| expr = convert (rtype, expr); |
| expr = build1 (NOP_EXPR, type, expr); |
| } |
| |
| /* We have another special case: if we are unchecked converting either |
| a subtype or a type with limited range into a base type, we need to |
| ensure that VRP doesn't propagate range information because this |
| conversion may be done precisely to validate that the object is |
| within the range it is supposed to have. */ |
| else if (TREE_CODE (expr) != INTEGER_CST |
| && TREE_CODE (type) == INTEGER_TYPE && !TREE_TYPE (type) |
| && ((TREE_CODE (etype) == INTEGER_TYPE && TREE_TYPE (etype)) |
| || TREE_CODE (etype) == ENUMERAL_TYPE |
| || TREE_CODE (etype) == BOOLEAN_TYPE)) |
| { |
| /* The optimization barrier is a VIEW_CONVERT_EXPR node; moreover, |
| in order not to be deemed an useless type conversion, it must |
| be from subtype to base type. |
| |
| Therefore we first do the bulk of the conversion to a subtype of |
| the final type. And this conversion must itself not be deemed |
| useless if the source type is not a subtype because, otherwise, |
| the final VIEW_CONVERT_EXPR will be deemed so as well. That's |
| why we toggle the unsigned flag in this conversion, which is |
| harmless since the final conversion is only a reinterpretation |
| of the bit pattern. |
| |
| ??? This may raise addressability and/or aliasing issues because |
| VIEW_CONVERT_EXPR gets gimplified as an lvalue, thus causing the |
| address of its operand to be taken if it is deemed addressable |
| and not already in GIMPLE form. */ |
| tree rtype |
| = gnat_type_for_mode (TYPE_MODE (type), !TYPE_UNSIGNED (etype)); |
| rtype = copy_type (rtype); |
| TYPE_MAIN_VARIANT (rtype) = rtype; |
| TREE_TYPE (rtype) = type; |
| expr = convert (rtype, expr); |
| expr = build1 (VIEW_CONVERT_EXPR, type, expr); |
| } |
| |
| else |
| expr = convert (type, expr); |
| } |
| |
| /* If we are converting to an integral type whose precision is not equal |
| to its size, first unchecked convert to a record that contains an |
| object of the output type. Then extract the field. */ |
| else if (INTEGRAL_TYPE_P (type) && TYPE_RM_SIZE (type) |
| && 0 != compare_tree_int (TYPE_RM_SIZE (type), |
| GET_MODE_BITSIZE (TYPE_MODE (type)))) |
| { |
| tree rec_type = make_node (RECORD_TYPE); |
| tree field = create_field_decl (get_identifier ("OBJ"), type, |
| rec_type, 1, 0, 0, 0); |
| |
| TYPE_FIELDS (rec_type) = field; |
| layout_type (rec_type); |
| |
| expr = unchecked_convert (rec_type, expr, notrunc_p); |
| expr = build_component_ref (expr, NULL_TREE, field, 0); |
| } |
| |
| /* Similarly if we are converting from an integral type whose precision |
| is not equal to its size. */ |
| else if (INTEGRAL_TYPE_P (etype) && TYPE_RM_SIZE (etype) |
| && 0 != compare_tree_int (TYPE_RM_SIZE (etype), |
| GET_MODE_BITSIZE (TYPE_MODE (etype)))) |
| { |
| tree rec_type = make_node (RECORD_TYPE); |
| tree field |
| = create_field_decl (get_identifier ("OBJ"), etype, rec_type, |
| 1, 0, 0, 0); |
| |
| TYPE_FIELDS (rec_type) = field; |
| layout_type (rec_type); |
| |
| expr = gnat_build_constructor (rec_type, build_tree_list (field, expr)); |
| expr = unchecked_convert (type, expr, notrunc_p); |
| } |
| |
| /* We have a special case when we are converting between two |
| unconstrained array types. In that case, take the address, |
| convert the fat pointer types, and dereference. */ |
| else if (TREE_CODE (etype) == UNCONSTRAINED_ARRAY_TYPE |
| && TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE) |
| expr = build_unary_op (INDIRECT_REF, NULL_TREE, |
| build1 (VIEW_CONVERT_EXPR, TREE_TYPE (type), |
| build_unary_op (ADDR_EXPR, NULL_TREE, |
| expr))); |
| else |
| { |
| expr = maybe_unconstrained_array (expr); |
| etype = TREE_TYPE (expr); |
| if (can_fold_for_view_convert_p (expr)) |
| expr = fold_build1 (VIEW_CONVERT_EXPR, type, expr); |
| else |
| expr = build1 (VIEW_CONVERT_EXPR, type, expr); |
| } |
| |
| /* If the result is an integral type whose precision is not equal to its |
| size, sign- or zero-extend the result. We need not do this if the input |
| is an integral type of the same precision and signedness or if the output |
| is a biased type or if both the input and output are unsigned. */ |
| if (!notrunc_p |
| && INTEGRAL_TYPE_P (type) && TYPE_RM_SIZE (type) |
| && !(TREE_CODE (type) == INTEGER_TYPE |
| && TYPE_BIASED_REPRESENTATION_P (type)) |
| && 0 != compare_tree_int (TYPE_RM_SIZE (type), |
| GET_MODE_BITSIZE (TYPE_MODE (type))) |
| && !(INTEGRAL_TYPE_P (etype) |
| && TYPE_UNSIGNED (type) == TYPE_UNSIGNED (etype) |
| && operand_equal_p (TYPE_RM_SIZE (type), |
| (TYPE_RM_SIZE (etype) != 0 |
| ? TYPE_RM_SIZE (etype) : TYPE_SIZE (etype)), |
| 0)) |
| && !(TYPE_UNSIGNED (type) && TYPE_UNSIGNED (etype))) |
| { |
| tree base_type = gnat_type_for_mode (TYPE_MODE (type), |
| TYPE_UNSIGNED (type)); |
| tree shift_expr |
| = convert (base_type, |
| size_binop (MINUS_EXPR, |
| bitsize_int |
| (GET_MODE_BITSIZE (TYPE_MODE (type))), |
| TYPE_RM_SIZE (type))); |
| expr |
| = convert (type, |
| build_binary_op (RSHIFT_EXPR, base_type, |
| build_binary_op (LSHIFT_EXPR, base_type, |
| convert (base_type, expr), |
| shift_expr), |
| shift_expr)); |
| } |
| |
| /* An unchecked conversion should never raise Constraint_Error. The code |
| below assumes that GCC's conversion routines overflow the same way that |
| the underlying hardware does. This is probably true. In the rare case |
| when it is false, we can rely on the fact that such conversions are |
| erroneous anyway. */ |
| if (TREE_CODE (expr) == INTEGER_CST) |
| TREE_OVERFLOW (expr) = 0; |
| |
| /* If the sizes of the types differ and this is an VIEW_CONVERT_EXPR, |
| show no longer constant. */ |
| if (TREE_CODE (expr) == VIEW_CONVERT_EXPR |
| && !operand_equal_p (TYPE_SIZE_UNIT (type), TYPE_SIZE_UNIT (etype), |
| OEP_ONLY_CONST)) |
| TREE_CONSTANT (expr) = 0; |
| |
| return expr; |
| } |
| |
| /* Return the appropriate GCC tree code for the specified GNAT type, |
| the latter being a record type as predicated by Is_Record_Type. */ |
| |
| enum tree_code |
| tree_code_for_record_type (Entity_Id gnat_type) |
| { |
| Node_Id component_list |
| = Component_List (Type_Definition |
| (Declaration_Node |
| (Implementation_Base_Type (gnat_type)))); |
| Node_Id component; |
| |
| /* Make this a UNION_TYPE unless it's either not an Unchecked_Union or |
| we have a non-discriminant field outside a variant. In either case, |
| it's a RECORD_TYPE. */ |
| |
| if (!Is_Unchecked_Union (gnat_type)) |
| return RECORD_TYPE; |
| |
| for (component = First_Non_Pragma (Component_Items (component_list)); |
| Present (component); |
| component = Next_Non_Pragma (component)) |
| if (Ekind (Defining_Entity (component)) == E_Component) |
| return RECORD_TYPE; |
| |
| return UNION_TYPE; |
| } |
| |
| /* Return true if GNU_TYPE is suitable as the type of a non-aliased |
| component of an aggregate type. */ |
| |
| bool |
| type_for_nonaliased_component_p (tree gnu_type) |
| { |
| /* If the type is passed by reference, we may have pointers to the |
| component so it cannot be made non-aliased. */ |
| if (must_pass_by_ref (gnu_type) || default_pass_by_ref (gnu_type)) |
| return false; |
| |
| /* We used to say that any component of aggregate type is aliased |
| because the front-end may take 'Reference of it. The front-end |
| has been enhanced in the meantime so as to use a renaming instead |
| in most cases, but the back-end can probably take the address of |
| such a component too so we go for the conservative stance. |
| |
| For instance, we might need the address of any array type, even |
| if normally passed by copy, to construct a fat pointer if the |
| component is used as an actual for an unconstrained formal. |
| |
| Likewise for record types: even if a specific record subtype is |
| passed by copy, the parent type might be passed by ref (e.g. if |
| it's of variable size) and we might take the address of a child |
| component to pass to a parent formal. We have no way to check |
| for such conditions here. */ |
| if (AGGREGATE_TYPE_P (gnu_type)) |
| return false; |
| |
| return true; |
| } |
| |
| /* Perform final processing on global variables. */ |
| |
| void |
| gnat_write_global_declarations (void) |
| { |
| /* Proceed to optimize and emit assembly. |
| FIXME: shouldn't be the front end's responsibility to call this. */ |
| cgraph_optimize (); |
| |
| /* Emit debug info for all global declarations. */ |
| emit_debug_global_declarations (VEC_address (tree, global_decls), |
| VEC_length (tree, global_decls)); |
| } |
| |
| /* ************************************************************************ |
| * * GCC builtins support * |
| * ************************************************************************ */ |
| |
| /* The general scheme is fairly simple: |
| |
| For each builtin function/type to be declared, gnat_install_builtins calls |
| internal facilities which eventually get to gnat_push_decl, which in turn |
| tracks the so declared builtin function decls in the 'builtin_decls' global |
| datastructure. When an Intrinsic subprogram declaration is processed, we |
| search this global datastructure to retrieve the associated BUILT_IN DECL |
| node. */ |
| |
| /* Search the chain of currently available builtin declarations for a node |
| corresponding to function NAME (an IDENTIFIER_NODE). Return the first node |
| found, if any, or NULL_TREE otherwise. */ |
| tree |
| builtin_decl_for (tree name) |
| { |
| unsigned i; |
| tree decl; |
| |
| for (i = 0; VEC_iterate(tree, builtin_decls, i, decl); i++) |
| if (DECL_NAME (decl) == name) |
| return decl; |
| |
| return NULL_TREE; |
| } |
| |
| /* The code below eventually exposes gnat_install_builtins, which declares |
| the builtin types and functions we might need, either internally or as |
| user accessible facilities. |
| |
| ??? This is a first implementation shot, still in rough shape. It is |
| heavily inspired from the "C" family implementation, with chunks copied |
| verbatim from there. |
| |
| Two obvious TODO candidates are |
| o Use a more efficient name/decl mapping scheme |
| o Devise a middle-end infrastructure to avoid having to copy |
| pieces between front-ends. */ |
| |
| /* ----------------------------------------------------------------------- * |
| * BUILTIN ELEMENTARY TYPES * |
| * ----------------------------------------------------------------------- */ |
| |
| /* Standard data types to be used in builtin argument declarations. */ |
| |
| enum c_tree_index |
| { |
| CTI_SIGNED_SIZE_TYPE, /* For format checking only. */ |
| CTI_STRING_TYPE, |
| CTI_CONST_STRING_TYPE, |
| |
| CTI_MAX |
| }; |
| |
| static tree c_global_trees[CTI_MAX]; |
| |
| #define signed_size_type_node c_global_trees[CTI_SIGNED_SIZE_TYPE] |
| #define string_type_node c_global_trees[CTI_STRING_TYPE] |
| #define const_string_type_node c_global_trees[CTI_CONST_STRING_TYPE] |
| |
| /* ??? In addition some attribute handlers, we currently don't support a |
| (small) number of builtin-types, which in turns inhibits support for a |
| number of builtin functions. */ |
| #define wint_type_node void_type_node |
| #define intmax_type_node void_type_node |
| #define uintmax_type_node void_type_node |
| |
| /* Build the void_list_node (void_type_node having been created). */ |
| |
| static tree |
| build_void_list_node (void) |
| { |
| tree t = build_tree_list (NULL_TREE, void_type_node); |
| return t; |
| } |
| |
| /* Used to help initialize the builtin-types.def table. When a type of |
| the correct size doesn't exist, use error_mark_node instead of NULL. |
| The later results in segfaults even when a decl using the type doesn't |
| get invoked. */ |
| |
| static tree |
| builtin_type_for_size (int size, bool unsignedp) |
| { |
| tree type = lang_hooks.types.type_for_size (size, unsignedp); |
| return type ? type : error_mark_node; |
| } |
| |
| /* Build/push the elementary type decls that builtin functions/types |
| will need. */ |
| |
| static void |
| install_builtin_elementary_types (void) |
| { |
| signed_size_type_node = size_type_node; |
| pid_type_node = integer_type_node; |
| void_list_node = build_void_list_node (); |
| |
| string_type_node = build_pointer_type (char_type_node); |
| const_string_type_node |
| = build_pointer_type (build_qualified_type |
| (char_type_node, TYPE_QUAL_CONST)); |
| } |
| |
| /* ----------------------------------------------------------------------- * |
| * BUILTIN FUNCTION TYPES * |
| * ----------------------------------------------------------------------- */ |
| |
| /* Now, builtin function types per se. */ |
| |
| enum c_builtin_type |
| { |
| #define DEF_PRIMITIVE_TYPE(NAME, VALUE) NAME, |
| #define DEF_FUNCTION_TYPE_0(NAME, RETURN) NAME, |
| #define DEF_FUNCTION_TYPE_1(NAME, RETURN, ARG1) NAME, |
| #define DEF_FUNCTION_TYPE_2(NAME, RETURN, ARG1, ARG2) NAME, |
| #define DEF_FUNCTION_TYPE_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME, |
| #define DEF_FUNCTION_TYPE_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME, |
| #define DEF_FUNCTION_TYPE_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) NAME, |
| #define DEF_FUNCTION_TYPE_6(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6) NAME, |
| #define DEF_FUNCTION_TYPE_7(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, ARG7) NAME, |
| #define DEF_FUNCTION_TYPE_VAR_0(NAME, RETURN) NAME, |
| #define DEF_FUNCTION_TYPE_VAR_1(NAME, RETURN, ARG1) NAME, |
| #define DEF_FUNCTION_TYPE_VAR_2(NAME, RETURN, ARG1, ARG2) NAME, |
| #define DEF_FUNCTION_TYPE_VAR_3(NAME, RETURN, ARG1, ARG2, ARG3) NAME, |
| #define DEF_FUNCTION_TYPE_VAR_4(NAME, RETURN, ARG1, ARG2, ARG3, ARG4) NAME, |
| #define DEF_FUNCTION_TYPE_VAR_5(NAME, RETURN, ARG1, ARG2, ARG3, ARG4, ARG6) \ |
| NAME, |
| #define DEF_POINTER_TYPE(NAME, TYPE) NAME, |
| #include "builtin-types.def" |
| #undef DEF_PRIMITIVE_TYPE |
| #undef DEF_FUNCTION_TYPE_0 |
| #undef DEF_FUNCTION_TYPE_1 |
| #undef DEF_FUNCTION_TYPE_2 |
| #undef DEF_FUNCTION_TYPE_3 |
| #undef DEF_FUNCTION_TYPE_4 |
| #undef DEF_FUNCTION_TYPE_5 |
| #undef DEF_FUNCTION_TYPE_6 |
| #undef DEF_FUNCTION_TYPE_7 |
| #undef DEF_FUNCTION_TYPE_VAR_0 |
| #undef DEF_FUNCTION_TYPE_VAR_1 |
| #undef DEF_FUNCTION_TYPE_VAR_2 |
| #undef DEF_FUNCTION_TYPE_VAR_3 |
| #undef DEF_FUNCTION_TYPE_VAR_4 |
| #undef DEF_FUNCTION_TYPE_VAR_5 |
| #undef DEF_POINTER_TYPE |
| BT_LAST |
| }; |
| |
| typedef enum c_builtin_type builtin_type; |
| |
| /* A temporary array used in communication with def_fn_type. */ |
| static GTY(()) tree builtin_types[(int) BT_LAST + 1]; |
| |
| /* A helper function for install_builtin_types. Build function type |
| for DEF with return type RET and N arguments. If VAR is true, then the |
| function should be variadic after those N arguments. |
| |
| Takes special care not to ICE if any of the types involved are |
| error_mark_node, which indicates that said type is not in fact available |
| (see builtin_type_for_size). In which case the function type as a whole |
| should be error_mark_node. */ |
| |
| static void |
| def_fn_type (builtin_type def, builtin_type ret, bool var, int n, ...) |
| { |
| tree args = NULL, t; |
| va_list list; |
| int i; |
| |
| va_start (list, n); |
| for (i = 0; i < n; ++i) |
| { |
| builtin_type a = va_arg (list, builtin_type); |
| t = builtin_types[a]; |
| if (t == error_mark_node) |
| goto egress; |
| args = tree_cons (NULL_TREE, t, args); |
| } |
| va_end (list); |
| |
| args = nreverse (args); |
| if (!var) |
| args = chainon (args, void_list_node); |
| |
| t = builtin_types[ret]; |
| if (t == error_mark_node) |
| goto egress; |
| t = build_function_type (t, args); |
| |
| egress: |
| builtin_types[def] = t; |
| } |
| |
| /* Build the builtin function types and install them in the builtin_types |
| array for later use in builtin function decls. */ |
| |
| static void |
| install_builtin_function_types (void) |
| { |
| tree va_list_ref_type_node; |
| tree va_list_arg_type_node; |
| |
| if (TREE_CODE (va_list_type_node) == ARRAY_TYPE) |
| { |
| va_list_arg_type_node = va_list_ref_type_node = |
| build_pointer_type (TREE_TYPE (va_list_type_node)); |
| } |
| else |
| { |
| va_list_arg_type_node = va_list_type_node; |
| va_list_ref_type_node = build_reference_type (va_list_type_node); |
| } |
| |
| #define DEF_PRIMITIVE_TYPE(ENUM, VALUE) \ |
| builtin_types[ENUM] = VALUE; |
| #define DEF_FUNCTION_TYPE_0(ENUM, RETURN) \ |
| def_fn_type (ENUM, RETURN, 0, 0); |
| #define DEF_FUNCTION_TYPE_1(ENUM, RETURN, ARG1) \ |
| def_fn_type (ENUM, RETURN, 0, 1, ARG1); |
| #define DEF_FUNCTION_TYPE_2(ENUM, RETURN, ARG1, ARG2) \ |
| def_fn_type (ENUM, RETURN, 0, 2, ARG1, ARG2); |
| #define DEF_FUNCTION_TYPE_3(ENUM, RETURN, ARG1, ARG2, ARG3) \ |
| def_fn_type (ENUM, RETURN, 0, 3, ARG1, ARG2, ARG3); |
| #define DEF_FUNCTION_TYPE_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \ |
| def_fn_type (ENUM, RETURN, 0, 4, ARG1, ARG2, ARG3, ARG4); |
| #define DEF_FUNCTION_TYPE_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \ |
| def_fn_type (ENUM, RETURN, 0, 5, ARG1, ARG2, ARG3, ARG4, ARG5); |
| #define DEF_FUNCTION_TYPE_6(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ |
| ARG6) \ |
| def_fn_type (ENUM, RETURN, 0, 6, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6); |
| #define DEF_FUNCTION_TYPE_7(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5, \ |
| ARG6, ARG7) \ |
| def_fn_type (ENUM, RETURN, 0, 7, ARG1, ARG2, ARG3, ARG4, ARG5, ARG6, ARG7); |
| #define DEF_FUNCTION_TYPE_VAR_0(ENUM, RETURN) \ |
| def_fn_type (ENUM, RETURN, 1, 0); |
| #define DEF_FUNCTION_TYPE_VAR_1(ENUM, RETURN, ARG1) \ |
| def_fn_type (ENUM, RETURN, 1, 1, ARG1); |
| #define DEF_FUNCTION_TYPE_VAR_2(ENUM, RETURN, ARG1, ARG2) \ |
| def_fn_type (ENUM, RETURN, 1, 2, ARG1, ARG2); |
| #define DEF_FUNCTION_TYPE_VAR_3(ENUM, RETURN, ARG1, ARG2, ARG3) \ |
| def_fn_type (ENUM, RETURN, 1, 3, ARG1, ARG2, ARG3); |
| #define DEF_FUNCTION_TYPE_VAR_4(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4) \ |
| def_fn_type (ENUM, RETURN, 1, 4, ARG1, ARG2, ARG3, ARG4); |
| #define DEF_FUNCTION_TYPE_VAR_5(ENUM, RETURN, ARG1, ARG2, ARG3, ARG4, ARG5) \ |
| def_fn_type (ENUM, RETURN, 1, 5, ARG1, ARG2, ARG3, ARG4, ARG5); |
| #define DEF_POINTER_TYPE(ENUM, TYPE) \ |
| builtin_types[(int) ENUM] = build_pointer_type (builtin_types[(int) TYPE]); |
| |
| #include "builtin-types.def" |
| |
| #undef DEF_PRIMITIVE_TYPE |
| #undef DEF_FUNCTION_TYPE_1 |
| #undef DEF_FUNCTION_TYPE_2 |
| #undef DEF_FUNCTION_TYPE_3 |
| #undef DEF_FUNCTION_TYPE_4 |
| #undef DEF_FUNCTION_TYPE_5 |
| #undef DEF_FUNCTION_TYPE_6 |
| #undef DEF_FUNCTION_TYPE_VAR_0 |
| #undef DEF_FUNCTION_TYPE_VAR_1 |
| #undef DEF_FUNCTION_TYPE_VAR_2 |
| #undef DEF_FUNCTION_TYPE_VAR_3 |
| #undef DEF_FUNCTION_TYPE_VAR_4 |
| #undef DEF_FUNCTION_TYPE_VAR_5 |
| #undef DEF_POINTER_TYPE |
| builtin_types[(int) BT_LAST] = NULL_TREE; |
| } |
| |
| /* ----------------------------------------------------------------------- * |
| * BUILTIN ATTRIBUTES * |
| * ----------------------------------------------------------------------- */ |
| |
| enum built_in_attribute |
| { |
| #define DEF_ATTR_NULL_TREE(ENUM) ENUM, |
| #define DEF_ATTR_INT(ENUM, VALUE) ENUM, |
| #define DEF_ATTR_IDENT(ENUM, STRING) ENUM, |
| #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) ENUM, |
| #include "builtin-attrs.def" |
| #undef DEF_ATTR_NULL_TREE |
| #undef DEF_ATTR_INT |
| #undef DEF_ATTR_IDENT |
| #undef DEF_ATTR_TREE_LIST |
| ATTR_LAST |
| }; |
| |
| static GTY(()) tree built_in_attributes[(int) ATTR_LAST]; |
| |
| static void |
| install_builtin_attributes (void) |
| { |
| /* Fill in the built_in_attributes array. */ |
| #define DEF_ATTR_NULL_TREE(ENUM) \ |
| built_in_attributes[(int) ENUM] = NULL_TREE; |
| #define DEF_ATTR_INT(ENUM, VALUE) \ |
| built_in_attributes[(int) ENUM] = build_int_cst (NULL_TREE, VALUE); |
| #define DEF_ATTR_IDENT(ENUM, STRING) \ |
| built_in_attributes[(int) ENUM] = get_identifier (STRING); |
| #define DEF_ATTR_TREE_LIST(ENUM, PURPOSE, VALUE, CHAIN) \ |
| built_in_attributes[(int) ENUM] \ |
| = tree_cons (built_in_attributes[(int) PURPOSE], \ |
| built_in_attributes[(int) VALUE], \ |
| built_in_attributes[(int) CHAIN]); |
| #include "builtin-attrs.def" |
| #undef DEF_ATTR_NULL_TREE |
| #undef DEF_ATTR_INT |
| #undef DEF_ATTR_IDENT |
| #undef DEF_ATTR_TREE_LIST |
| } |
| |
| /* Handle a "const" attribute; arguments as in |
| struct attribute_spec.handler. */ |
| |
| static tree |
| handle_const_attribute (tree *node, tree ARG_UNUSED (name), |
| tree ARG_UNUSED (args), int ARG_UNUSED (flags), |
| bool *no_add_attrs) |
| { |
| if (TREE_CODE (*node) == FUNCTION_DECL) |
| TREE_READONLY (*node) = 1; |
| else |
| *no_add_attrs = true; |
| |
| return NULL_TREE; |
| } |
| |
| /* Handle a "nothrow" attribute; arguments as in |
| struct attribute_spec.handler. */ |
| |
| static tree |
| handle_nothrow_attribute (tree *node, tree ARG_UNUSED (name), |
| tree ARG_UNUSED (args), int ARG_UNUSED (flags), |
| bool *no_add_attrs) |
| { |
| if (TREE_CODE (*node) == FUNCTION_DECL) |
| TREE_NOTHROW (*node) = 1; |
| else |
| *no_add_attrs = true; |
| |
| return NULL_TREE; |
| } |
| |
| /* Handle a "pure" attribute; arguments as in |
| struct attribute_spec.handler. */ |
| |
| static tree |
| handle_pure_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
| int ARG_UNUSED (flags), bool *no_add_attrs) |
| { |
| if (TREE_CODE (*node) == FUNCTION_DECL) |
| DECL_PURE_P (*node) = 1; |
| /* ??? TODO: Support types. */ |
| else |
| { |
| warning (OPT_Wattributes, "%qE attribute ignored", name); |
| *no_add_attrs = true; |
| } |
| |
| return NULL_TREE; |
| } |
| |
| /* Handle a "no vops" attribute; arguments as in |
| struct attribute_spec.handler. */ |
| |
| static tree |
| handle_novops_attribute (tree *node, tree ARG_UNUSED (name), |
| tree ARG_UNUSED (args), int ARG_UNUSED (flags), |
| bool *ARG_UNUSED (no_add_attrs)) |
| { |
| gcc_assert (TREE_CODE (*node) == FUNCTION_DECL); |
| DECL_IS_NOVOPS (*node) = 1; |
| return NULL_TREE; |
| } |
| |
| /* Helper for nonnull attribute handling; fetch the operand number |
| from the attribute argument list. */ |
| |
| static bool |
| get_nonnull_operand (tree arg_num_expr, unsigned HOST_WIDE_INT *valp) |
| { |
| /* Verify the arg number is a constant. */ |
| if (TREE_CODE (arg_num_expr) != INTEGER_CST |
| || TREE_INT_CST_HIGH (arg_num_expr) != 0) |
| return false; |
| |
| *valp = TREE_INT_CST_LOW (arg_num_expr); |
| return true; |
| } |
| |
| /* Handle the "nonnull" attribute. */ |
| static tree |
| handle_nonnull_attribute (tree *node, tree ARG_UNUSED (name), |
| tree args, int ARG_UNUSED (flags), |
| bool *no_add_attrs) |
| { |
| tree type = *node; |
| unsigned HOST_WIDE_INT attr_arg_num; |
| |
| /* If no arguments are specified, all pointer arguments should be |
| non-null. Verify a full prototype is given so that the arguments |
| will have the correct types when we actually check them later. */ |
| if (!args) |
| { |
| if (!TYPE_ARG_TYPES (type)) |
| { |
| error ("nonnull attribute without arguments on a non-prototype"); |
| *no_add_attrs = true; |
| } |
| return NULL_TREE; |
| } |
| |
| /* Argument list specified. Verify that each argument number references |
| a pointer argument. */ |
| for (attr_arg_num = 1; args; args = TREE_CHAIN (args)) |
| { |
| tree argument; |
| unsigned HOST_WIDE_INT arg_num = 0, ck_num; |
| |
| if (!get_nonnull_operand (TREE_VALUE (args), &arg_num)) |
| { |
| error ("nonnull argument has invalid operand number (argument %lu)", |
| (unsigned long) attr_arg_num); |
| *no_add_attrs = true; |
| return NULL_TREE; |
| } |
| |
| argument = TYPE_ARG_TYPES (type); |
| if (argument) |
| { |
| for (ck_num = 1; ; ck_num++) |
| { |
| if (!argument || ck_num == arg_num) |
| break; |
| argument = TREE_CHAIN (argument); |
| } |
| |
| if (!argument |
| || TREE_CODE (TREE_VALUE (argument)) == VOID_TYPE) |
| { |
| error ("nonnull argument with out-of-range operand number (argument %lu, operand %lu)", |
| (unsigned long) attr_arg_num, (unsigned long) arg_num); |
| *no_add_attrs = true; |
| return NULL_TREE; |
| } |
| |
| if (TREE_CODE (TREE_VALUE (argument)) != POINTER_TYPE) |
| { |
| error ("nonnull argument references non-pointer operand (argument %lu, operand %lu)", |
| (unsigned long) attr_arg_num, (unsigned long) arg_num); |
| *no_add_attrs = true; |
| return NULL_TREE; |
| } |
| } |
| } |
| |
| return NULL_TREE; |
| } |
| |
| /* Handle a "sentinel" attribute. */ |
| |
| static tree |
| handle_sentinel_attribute (tree *node, tree name, tree args, |
| int ARG_UNUSED (flags), bool *no_add_attrs) |
| { |
| tree params = TYPE_ARG_TYPES (*node); |
| |
| if (!params) |
| { |
| warning (OPT_Wattributes, |
| "%qE attribute requires prototypes with named arguments", name); |
| *no_add_attrs = true; |
| } |
| else |
| { |
| while (TREE_CHAIN (params)) |
| params = TREE_CHAIN (params); |
| |
| if (VOID_TYPE_P (TREE_VALUE (params))) |
| { |
| warning (OPT_Wattributes, |
| "%qE attribute only applies to variadic functions", name); |
| *no_add_attrs = true; |
| } |
| } |
| |
| if (args) |
| { |
| tree position = TREE_VALUE (args); |
| |
| if (TREE_CODE (position) != INTEGER_CST) |
| { |
| warning (0, "requested position is not an integer constant"); |
| *no_add_attrs = true; |
| } |
| else |
| { |
| if (tree_int_cst_lt (position, integer_zero_node)) |
| { |
| warning (0, "requested position is less than zero"); |
| *no_add_attrs = true; |
| } |
| } |
| } |
| |
| return NULL_TREE; |
| } |
| |
| /* Handle a "noreturn" attribute; arguments as in |
| struct attribute_spec.handler. */ |
| |
| static tree |
| handle_noreturn_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
| int ARG_UNUSED (flags), bool *no_add_attrs) |
| { |
| tree type = TREE_TYPE (*node); |
| |
| /* See FIXME comment in c_common_attribute_table. */ |
| if (TREE_CODE (*node) == FUNCTION_DECL) |
| TREE_THIS_VOLATILE (*node) = 1; |
| else if (TREE_CODE (type) == POINTER_TYPE |
| && TREE_CODE (TREE_TYPE (type)) == FUNCTION_TYPE) |
| TREE_TYPE (*node) |
| = build_pointer_type |
| (build_type_variant (TREE_TYPE (type), |
| TYPE_READONLY (TREE_TYPE (type)), 1)); |
| else |
| { |
| warning (OPT_Wattributes, "%qE attribute ignored", name); |
| *no_add_attrs = true; |
| } |
| |
| return NULL_TREE; |
| } |
| |
| /* Handle a "malloc" attribute; arguments as in |
| struct attribute_spec.handler. */ |
| |
| static tree |
| handle_malloc_attribute (tree *node, tree name, tree ARG_UNUSED (args), |
| int ARG_UNUSED (flags), bool *no_add_attrs) |
| { |
| if (TREE_CODE (*node) == FUNCTION_DECL |
| && POINTER_TYPE_P (TREE_TYPE (TREE_TYPE (*node)))) |
| DECL_IS_MALLOC (*node) = 1; |
| else |
| { |
| warning (OPT_Wattributes, "%qE attribute ignored", name); |
| *no_add_attrs = true; |
| } |
| |
| return NULL_TREE; |
| } |
| |
| /* Fake handler for attributes we don't properly support. */ |
| |
| tree |
| fake_attribute_handler (tree * ARG_UNUSED (node), |
| tree ARG_UNUSED (name), |
| tree ARG_UNUSED (args), |
| int ARG_UNUSED (flags), |
| bool * ARG_UNUSED (no_add_attrs)) |
| { |
| return NULL_TREE; |
| } |
| |
| /* Handle a "type_generic" attribute. */ |
| |
| static tree |
| handle_type_generic_attribute (tree *node, tree ARG_UNUSED (name), |
| tree ARG_UNUSED (args), int ARG_UNUSED (flags), |
| bool * ARG_UNUSED (no_add_attrs)) |
| { |
| tree params; |
| |
| /* Ensure we have a function type. */ |
| gcc_assert (TREE_CODE (*node) == FUNCTION_TYPE); |
| |
| params = TYPE_ARG_TYPES (*node); |
| while (params && ! VOID_TYPE_P (TREE_VALUE (params))) |
| params = TREE_CHAIN (params); |
| |
| /* Ensure we have a variadic function. */ |
| gcc_assert (!params); |
| |
| return NULL_TREE; |
| } |
| |
| /* ----------------------------------------------------------------------- * |
| * BUILTIN FUNCTIONS * |
| * ----------------------------------------------------------------------- */ |
| |
| /* Worker for DEF_BUILTIN. Possibly define a builtin function with one or two |
| names. Does not declare a non-__builtin_ function if flag_no_builtin, or |
| if nonansi_p and flag_no_nonansi_builtin. */ |
| |
| static void |
| def_builtin_1 (enum built_in_function fncode, |
| const char *name, |
| enum built_in_class fnclass, |
| tree fntype, tree libtype, |
| bool both_p, bool fallback_p, |
| bool nonansi_p ATTRIBUTE_UNUSED, |
| tree fnattrs, bool implicit_p) |
| { |
| tree decl; |
| const char *libname; |
| |
| /* Preserve an already installed decl. It most likely was setup in advance |
| (e.g. as part of the internal builtins) for specific reasons. */ |
| if (built_in_decls[(int) fncode] != NULL_TREE) |
| return; |
| |
| gcc_assert ((!both_p && !fallback_p) |
| || !strncmp (name, "__builtin_", |
| strlen ("__builtin_"))); |
| |
| libname = name + strlen ("__builtin_"); |
| decl = add_builtin_function (name, fntype, fncode, fnclass, |
| (fallback_p ? libname : NULL), |
| fnattrs); |
| if (both_p) |
| /* ??? This is normally further controlled by command-line options |
| like -fno-builtin, but we don't have them for Ada. */ |
| add_builtin_function (libname, libtype, fncode, fnclass, |
| NULL, fnattrs); |
| |
| built_in_decls[(int) fncode] = decl; |
| if (implicit_p) |
| implicit_built_in_decls[(int) fncode] = decl; |
| } |
| |
| static int flag_isoc94 = 0; |
| static int flag_isoc99 = 0; |
| |
| /* Install what the common builtins.def offers. */ |
| |
| static void |
| install_builtin_functions (void) |
| { |
| #define DEF_BUILTIN(ENUM, NAME, CLASS, TYPE, LIBTYPE, BOTH_P, FALLBACK_P, \ |
| NONANSI_P, ATTRS, IMPLICIT, COND) \ |
| if (NAME && COND) \ |
| def_builtin_1 (ENUM, NAME, CLASS, \ |
| builtin_types[(int) TYPE], \ |
| builtin_types[(int) LIBTYPE], \ |
| BOTH_P, FALLBACK_P, NONANSI_P, \ |
| built_in_attributes[(int) ATTRS], IMPLICIT); |
| #include "builtins.def" |
| #undef DEF_BUILTIN |
| } |
| |
| /* ----------------------------------------------------------------------- * |
| * BUILTIN FUNCTIONS * |
| * ----------------------------------------------------------------------- */ |
| |
| /* Install the builtin functions we might need. */ |
| |
| void |
| gnat_install_builtins (void) |
| { |
| install_builtin_elementary_types (); |
| install_builtin_function_types (); |
| install_builtin_attributes (); |
| |
| /* Install builtins used by generic middle-end pieces first. Some of these |
| know about internal specificities and control attributes accordingly, for |
| instance __builtin_alloca vs no-throw and -fstack-check. We will ignore |
| the generic definition from builtins.def. */ |
| build_common_builtin_nodes (); |
| |
| /* Now, install the target specific builtins, such as the AltiVec family on |
| ppc, and the common set as exposed by builtins.def. */ |
| targetm.init_builtins (); |
| install_builtin_functions (); |
| } |
| |
| #include "gt-ada-utils.h" |
| #include "gtype-ada.h" |