/**************************************************************************** * * * GNAT COMPILER COMPONENTS * * * * M I S C * * * * C Implementation File * * * * Copyright (C) 1992-2003 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 2, 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 distributed with GNAT; see file COPYING. If not, write * * to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, * * MA 02111-1307, USA. * * * * As a special exception, if you link this file with other files to * * produce an executable, this file does not by itself cause the resulting * * executable to be covered by the GNU General Public License. This except- * * ion does not however invalidate any other reasons why the executable * * file might be covered by the GNU Public License. * * * * GNAT was originally developed by the GNAT team at New York University. * * Extensive contributions were provided by Ada Core Technologies Inc. * * * ****************************************************************************/ /* This file contains parts of the compiler that are required for interfacing with GCC but otherwise do nothing and parts of Gigi that need to know about RTL. */ #include "config.h" #include "system.h" #include "coretypes.h" #include "tm.h" #include "tree.h" #include "rtl.h" #include "errors.h" #include "diagnostic.h" #include "expr.h" #include "libfuncs.h" #include "ggc.h" #include "flags.h" #include "debug.h" #include "insn-codes.h" #include "insn-flags.h" #include "insn-config.h" #include "optabs.h" #include "recog.h" #include "toplev.h" #include "output.h" #include "except.h" #include "tm_p.h" #include "langhooks.h" #include "langhooks-def.h" #include "target.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" #include "adadecode.h" #include "opts.h" #include "options.h" extern FILE *asm_out_file; /* The largest alignment, in bits, that is needed for using the widest move instruction. */ unsigned int largest_move_alignment; static size_t gnat_tree_size (enum tree_code); static bool gnat_init (void); static void gnat_finish_incomplete_decl (tree); static unsigned int gnat_init_options (unsigned int, const char **); static int gnat_handle_option (size_t, const char *, int); static HOST_WIDE_INT gnat_get_alias_set (tree); static void gnat_print_decl (FILE *, tree, int); static void gnat_print_type (FILE *, tree, int); static const char *gnat_printable_name (tree, int); static tree gnat_eh_runtime_type (tree); static int gnat_eh_type_covers (tree, tree); static void gnat_parse_file (int); static rtx gnat_expand_expr (tree, rtx, enum machine_mode, int); static void internal_error_function (const char *, va_list *); static void gnat_adjust_rli (record_layout_info); /* Structure giving our language-specific hooks. */ #undef LANG_HOOKS_NAME #define LANG_HOOKS_NAME "GNU Ada" #undef LANG_HOOKS_IDENTIFIER_SIZE #define LANG_HOOKS_IDENTIFIER_SIZE sizeof (struct tree_identifier) #undef LANG_HOOKS_TREE_SIZE #define LANG_HOOKS_TREE_SIZE gnat_tree_size #undef LANG_HOOKS_INIT #define LANG_HOOKS_INIT gnat_init #undef LANG_HOOKS_INIT_OPTIONS #define LANG_HOOKS_INIT_OPTIONS gnat_init_options #undef LANG_HOOKS_HANDLE_OPTION #define LANG_HOOKS_HANDLE_OPTION gnat_handle_option #undef LANG_HOOKS_PARSE_FILE #define LANG_HOOKS_PARSE_FILE gnat_parse_file #undef LANG_HOOKS_HONOR_READONLY #define LANG_HOOKS_HONOR_READONLY 1 #undef LANG_HOOKS_FINISH_INCOMPLETE_DECL #define LANG_HOOKS_FINISH_INCOMPLETE_DECL gnat_finish_incomplete_decl #undef LANG_HOOKS_GET_ALIAS_SET #define LANG_HOOKS_GET_ALIAS_SET gnat_get_alias_set #undef LANG_HOOKS_EXPAND_EXPR #define LANG_HOOKS_EXPAND_EXPR gnat_expand_expr #undef LANG_HOOKS_MARK_ADDRESSABLE #define LANG_HOOKS_MARK_ADDRESSABLE gnat_mark_addressable #undef LANG_HOOKS_TRUTHVALUE_CONVERSION #define LANG_HOOKS_TRUTHVALUE_CONVERSION gnat_truthvalue_conversion #undef LANG_HOOKS_PRINT_DECL #define LANG_HOOKS_PRINT_DECL gnat_print_decl #undef LANG_HOOKS_PRINT_TYPE #define LANG_HOOKS_PRINT_TYPE gnat_print_type #undef LANG_HOOKS_DECL_PRINTABLE_NAME #define LANG_HOOKS_DECL_PRINTABLE_NAME gnat_printable_name #undef LANG_HOOKS_TYPE_FOR_MODE #define LANG_HOOKS_TYPE_FOR_MODE gnat_type_for_mode #undef LANG_HOOKS_TYPE_FOR_SIZE #define LANG_HOOKS_TYPE_FOR_SIZE gnat_type_for_size #undef LANG_HOOKS_SIGNED_TYPE #define LANG_HOOKS_SIGNED_TYPE gnat_signed_type #undef LANG_HOOKS_UNSIGNED_TYPE #define LANG_HOOKS_UNSIGNED_TYPE gnat_unsigned_type #undef LANG_HOOKS_SIGNED_OR_UNSIGNED_TYPE #define LANG_HOOKS_SIGNED_OR_UNSIGNED_TYPE gnat_signed_or_unsigned_type const struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER; /* Tables describing GCC tree codes used only by GNAT. Table indexed by tree code giving a string containing a character classifying the tree code. Possibilities are t, d, s, c, r, <, 1 and 2. See cp-tree.def for details. */ #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) TYPE, const char tree_code_type[] = { #include "tree.def" 'x', #include "ada-tree.def" }; #undef DEFTREECODE /* Table indexed by tree code giving number of expression operands beyond the fixed part of the node structure. Not used for types or decls. */ #define DEFTREECODE(SYM, NAME, TYPE, LENGTH) LENGTH, const unsigned char tree_code_length[] = { #include "tree.def" 0, #include "ada-tree.def" }; #undef DEFTREECODE /* Names of tree components. Used for printing out the tree and error messages. */ #define DEFTREECODE(SYM, NAME, TYPE, LEN) NAME, const char *const tree_code_name[] = { #include "tree.def" "@@dummy", #include "ada-tree.def" }; #undef DEFTREECODE /* Command-line argc and argv. These variables are global, since they are imported and used in back_end.adb */ unsigned int save_argc; const char **save_argv; /* gnat standard argc argv */ extern int gnat_argc; extern char **gnat_argv; /* Declare functions we use as part of startup. */ extern void __gnat_initialize (void); extern void adainit (void); extern void _ada_gnat1drv (void); /* The parser for the language. For us, we process the GNAT tree. */ static void gnat_parse_file (int set_yydebug ATTRIBUTE_UNUSED) { /* call the target specific initializations */ __gnat_initialize(); /* Call the front-end elaboration procedures */ adainit (); immediate_size_expand = 1; /* Call the front end */ _ada_gnat1drv (); } /* Decode all the language specific options that cannot be decoded by GCC. The option decoding phase of GCC calls this routine on the flags that it cannot decode. This routine returns the number of consecutive arguments from ARGV that it successfully decoded; 0 indicates failure. */ static int gnat_handle_option (size_t scode, const char *arg, int value ATTRIBUTE_UNUSED) { const struct cl_option *option = &cl_options[scode]; enum opt_code code = (enum opt_code) scode; char *q; unsigned int i; if (arg == NULL && (option->flags & (CL_JOINED | CL_SEPARATE))) { error ("missing argument to \"-%s\"", option->opt_text); return 1; } switch (code) { default: abort (); case OPT_I: q = xmalloc (sizeof("-I") + strlen (arg)); strcpy (q, "-I"); strcat (q, arg); gnat_argv[gnat_argc] = q; gnat_argc++; break; /* All front ends are expected to accept this. */ case OPT_Wall: /* These are used in the GCC Makefile. */ case OPT_Wmissing_prototypes: case OPT_Wstrict_prototypes: case OPT_Wwrite_strings: case OPT_Wno_long_long: break; /* This is handled by the front-end. */ case OPT_nostdinc: break; case OPT_fRTS: gnat_argv[gnat_argc] = xstrdup ("-fRTS"); gnat_argc++; break; case OPT_gant: warning ("`-gnat' misspelled as `-gant'"); /* ... fall through ... */ case OPT_gnat: /* Recopy the switches without the 'gnat' prefix. */ gnat_argv[gnat_argc] = xmalloc (strlen (arg) + 2); gnat_argv[gnat_argc][0] = '-'; strcpy (gnat_argv[gnat_argc] + 1, arg); gnat_argc++; if (arg[0] == 'O') for (i = 1; i < save_argc - 1; i++) if (!strncmp (save_argv[i], "-gnatO", 6)) if (save_argv[++i][0] != '-') { /* Preserve output filename as GCC doesn't save it for GNAT. */ gnat_argv[gnat_argc] = xstrdup (save_argv[i]); gnat_argc++; break; } break; } return 1; } /* Initialize for option processing. */ static unsigned int gnat_init_options (unsigned int argc, const char **argv) { /* Initialize gnat_argv with save_argv size. */ gnat_argv = (char **) xmalloc ((argc + 1) * sizeof (argv[0])); gnat_argv[0] = xstrdup (argv[0]); /* name of the command */ gnat_argc = 1; save_argc = argc; save_argv = argv; return CL_Ada; } /* Here is the function to handle the compiler error processing in GCC. */ static void internal_error_function (const char *msgid, va_list *ap) { char buffer[1000]; /* Assume this is big enough. */ char *p; String_Template temp; Fat_Pointer fp; vsprintf (buffer, msgid, *ap); /* Go up to the first newline. */ for (p = buffer; *p != 0; p++) if (*p == '\n') { *p = '\0'; break; } temp.Low_Bound = 1, temp.High_Bound = strlen (buffer); fp.Array = buffer, fp.Bounds = &temp; Current_Error_Node = error_gnat_node; Compiler_Abort (fp, -1); } /* Langhook for tree_size: Determine size of our 'x' and 'c' nodes. */ static size_t gnat_tree_size (enum tree_code code) { switch (code) { case GNAT_LOOP_ID: return sizeof (struct tree_loop_id); default: abort (); } /* NOTREACHED */ } /* Perform all the initialization steps that are language-specific. */ static bool gnat_init () { /* Performs whatever initialization steps needed by the language-dependent lexical analyzer. */ gnat_init_decl_processing (); /* Add the input filename as the last argument. */ gnat_argv[gnat_argc] = (char *) main_input_filename; gnat_argc++; gnat_argv[gnat_argc] = 0; global_dc->internal_error = &internal_error_function; /* Show that REFERENCE_TYPEs are internal and should be Pmode. */ internal_reference_types (); set_lang_adjust_rli (gnat_adjust_rli); return true; } /* This function is called indirectly from toplev.c to handle incomplete declarations, i.e. VAR_DECL nodes whose DECL_SIZE is zero. To be precise, compile_file in toplev.c makes an indirect call through the function pointer incomplete_decl_finalize_hook which is initialized to this routine in init_decl_processing. */ static void gnat_finish_incomplete_decl (tree dont_care ATTRIBUTE_UNUSED) { gigi_abort (202); } /* Compute the alignment of the largest mode that can be used for copying objects. */ void gnat_compute_largest_alignment () { enum machine_mode mode; for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); mode != VOIDmode; mode = GET_MODE_WIDER_MODE (mode)) if (mov_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing) largest_move_alignment = MIN (BIGGEST_ALIGNMENT, MAX (largest_move_alignment, GET_MODE_ALIGNMENT (mode))); } /* If we are using the GCC mechanism to process exception handling, we have to register the personality routine for Ada and to initialize various language dependent hooks. */ void gnat_init_gcc_eh () { /* We shouldn't do anything if the No_Exceptions_Handler pragma is set, though. This could for instance lead to the emission of tables with references to symbols (such as the Ada eh personality routine) within libraries we won't link against. */ if (No_Exception_Handlers_Set ()) return; /* Tell GCC we are handling cleanup actions through exception propagation. This opens possibilities that we don't take advantage of yet, but is nonetheless necessary to ensure that fixup code gets assigned to the right exception regions. */ using_eh_for_cleanups (); eh_personality_libfunc = init_one_libfunc ("__gnat_eh_personality"); lang_eh_type_covers = gnat_eh_type_covers; lang_eh_runtime_type = gnat_eh_runtime_type; /* Turn on -fexceptions and -fnon-call-exceptions. The first one triggers the generation of the necessary exception runtime tables. The second one is useful for two reasons: 1/ we map some asynchronous signals like SEGV to exceptions, so we need to ensure that the insns which can lead to such signals are correctly attached to the exception region they pertain to, 2/ Some calls to pure subprograms are handled as libcall blocks and then marked as "cannot trap" if the flag is not set (see emit_libcall_block). We should not let this be since it is possible for such calls to actually raise in Ada. */ flag_exceptions = 1; flag_non_call_exceptions = 1; init_eh (); #ifdef DWARF2_UNWIND_INFO if (dwarf2out_do_frame ()) dwarf2out_frame_init (); #endif } /* Language hooks, first one to print language-specific items in a DECL. */ static void gnat_print_decl (FILE *file, tree node, int indent) { switch (TREE_CODE (node)) { case CONST_DECL: print_node (file, "const_corresponding_var", DECL_CONST_CORRESPONDING_VAR (node), indent + 4); break; case FIELD_DECL: print_node (file, "original field", DECL_ORIGINAL_FIELD (node), indent + 4); break; default: break; } } static void gnat_print_type (FILE *file, tree node, int indent) { switch (TREE_CODE (node)) { case FUNCTION_TYPE: print_node (file, "ci_co_list", TYPE_CI_CO_LIST (node), indent + 4); break; case ENUMERAL_TYPE: print_node (file, "RM size", TYPE_RM_SIZE_ENUM (node), indent + 4); break; case INTEGER_TYPE: if (TYPE_MODULAR_P (node)) print_node (file, "modulus", TYPE_MODULUS (node), indent + 4); else if (TYPE_HAS_ACTUAL_BOUNDS_P (node)) print_node (file, "actual bounds", TYPE_ACTUAL_BOUNDS (node), indent + 4); else if (TYPE_VAX_FLOATING_POINT_P (node)) ; else print_node (file, "index type", TYPE_INDEX_TYPE (node), indent + 4); print_node (file, "RM size", TYPE_RM_SIZE_INT (node), indent + 4); break; case ARRAY_TYPE: print_node (file,"actual bounds", TYPE_ACTUAL_BOUNDS (node), indent + 4); break; case RECORD_TYPE: if (TYPE_IS_FAT_POINTER_P (node) || TYPE_CONTAINS_TEMPLATE_P (node)) print_node (file, "unconstrained array", TYPE_UNCONSTRAINED_ARRAY (node), indent + 4); else print_node (file, "Ada size", TYPE_ADA_SIZE (node), indent + 4); break; case UNION_TYPE: case QUAL_UNION_TYPE: print_node (file, "Ada size", TYPE_ADA_SIZE (node), indent + 4); break; default: break; } } static const char * gnat_printable_name (tree decl, int verbosity ATTRIBUTE_UNUSED) { const char *coded_name = IDENTIFIER_POINTER (DECL_NAME (decl)); char *ada_name = (char *) ggc_alloc (strlen (coded_name) * 2 + 60); __gnat_decode (coded_name, ada_name, 0); return (const char *) ada_name; } /* Expands GNAT-specific GCC tree nodes. The only ones we support here are TRANSFORM_EXPR, ALLOCATE_EXPR, USE_EXPR and NULL_EXPR. */ static rtx gnat_expand_expr (tree exp, rtx target, enum machine_mode tmode, int modifier) { tree type = TREE_TYPE (exp); tree new; rtx result; /* Update EXP to be the new expression to expand. */ switch (TREE_CODE (exp)) { case TRANSFORM_EXPR: gnat_to_code (TREE_COMPLEXITY (exp)); return const0_rtx; break; case NULL_EXPR: expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, 0); /* We aren't going to be doing anything with this memory, but allocate it anyway. If it's variable size, make a bogus address. */ if (! host_integerp (TYPE_SIZE_UNIT (type), 1)) result = gen_rtx_MEM (BLKmode, virtual_stack_vars_rtx); else result = assign_temp (type, 0, TREE_ADDRESSABLE (exp), 1); return result; case ALLOCATE_EXPR: return allocate_dynamic_stack_space (expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, TYPE_MODE (sizetype), EXPAND_NORMAL), NULL_RTX, tree_low_cst (TREE_OPERAND (exp, 1), 1)); case USE_EXPR: if (target != const0_rtx) gigi_abort (203); /* First write a volatile ASM_INPUT to prevent anything from being moved. */ result = gen_rtx_ASM_INPUT (VOIDmode, ""); MEM_VOLATILE_P (result) = 1; emit_insn (result); result = expand_expr (TREE_OPERAND (exp, 0), NULL_RTX, VOIDmode, modifier); emit_insn (gen_rtx_USE (VOIDmode, result)); return target; case GNAT_NOP_EXPR: return expand_expr (build1 (NOP_EXPR, type, TREE_OPERAND (exp, 0)), target, tmode, modifier); case UNCONSTRAINED_ARRAY_REF: /* If we are evaluating just for side-effects, just evaluate our operand. Otherwise, abort since this code should never appear in a tree to be evaluated (objects aren't unconstrained). */ if (target == const0_rtx || TREE_CODE (type) == VOID_TYPE) return expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, modifier); /* ... fall through ... */ default: gigi_abort (201); } return expand_expr (new, target, tmode, modifier); } /* Adjusts the RLI used to layout a record after all the fields have been added. We only handle the packed case and cause it to use the alignment that will pad the record at the end. */ static void gnat_adjust_rli (record_layout_info rli ATTRIBUTE_UNUSED) { #if 0 /* ??? This code seems to have no actual effect; record_align should already reflect the largest alignment desired by a field. jason 2003-04-01 */ unsigned int record_align = rli->unpadded_align; tree field; /* If an alignment has been specified, don't use anything larger unless we have to. */ if (TYPE_ALIGN (rli->t) != 0 && TYPE_ALIGN (rli->t) < record_align) record_align = MAX (rli->record_align, TYPE_ALIGN (rli->t)); /* If any fields have variable size, we need to force the record to be at least as aligned as the alignment of that type. */ for (field = TYPE_FIELDS (rli->t); field; field = TREE_CHAIN (field)) if (TREE_CODE (DECL_SIZE_UNIT (field)) != INTEGER_CST) record_align = MAX (record_align, DECL_ALIGN (field)); if (TYPE_PACKED (rli->t)) rli->record_align = record_align; #endif } /* Make a TRANSFORM_EXPR to later expand GNAT_NODE into code. */ tree make_transform_expr (Node_Id gnat_node) { tree gnu_result = build (TRANSFORM_EXPR, void_type_node); TREE_SIDE_EFFECTS (gnu_result) = 1; TREE_COMPLEXITY (gnu_result) = gnat_node; return gnu_result; } /* Update the setjmp buffer BUF with the current stack pointer. We assume here that a __builtin_setjmp was done to BUF. */ void update_setjmp_buf (tree buf) { enum machine_mode sa_mode = Pmode; rtx stack_save; #ifdef HAVE_save_stack_nonlocal if (HAVE_save_stack_nonlocal) sa_mode = insn_data[(int) CODE_FOR_save_stack_nonlocal].operand[0].mode; #endif #ifdef STACK_SAVEAREA_MODE sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL); #endif stack_save = gen_rtx_MEM (sa_mode, memory_address (sa_mode, plus_constant (expand_expr (build_unary_op (ADDR_EXPR, NULL_TREE, buf), NULL_RTX, VOIDmode, 0), 2 * GET_MODE_SIZE (Pmode)))); #ifdef HAVE_setjmp if (HAVE_setjmp) emit_insn (gen_setjmp ()); #endif emit_stack_save (SAVE_NONLOCAL, &stack_save, NULL_RTX); } /* These routines are used in conjunction with GCC exception handling. */ /* Map compile-time to run-time tree for GCC exception handling scheme. */ static tree gnat_eh_runtime_type (tree type) { return type; } /* Return true if type A catches type B. Callback for flow analysis from the exception handling part of the back-end. */ static int gnat_eh_type_covers (tree a, tree b) { /* a catches b if they represent the same exception id or if a is an "others". ??? integer_zero_node for "others" is hardwired in too many places currently. */ return (a == b || a == integer_zero_node); } /* See if DECL has an RTL that is indirect via a pseudo-register or a memory location and replace it with an indirect reference if so. This improves the debugger's ability to display the value. */ void adjust_decl_rtl (tree decl) { tree new_type; /* If this decl is already indirect, don't do anything. This should mean that the decl cannot be indirect, but there's no point in adding an abort to check that. */ if (TREE_CODE (decl) != CONST_DECL && ! DECL_BY_REF_P (decl) && (GET_CODE (DECL_RTL (decl)) == MEM && (GET_CODE (XEXP (DECL_RTL (decl), 0)) == MEM || (GET_CODE (XEXP (DECL_RTL (decl), 0)) == REG && (REGNO (XEXP (DECL_RTL (decl), 0)) > LAST_VIRTUAL_REGISTER)))) /* We can't do this if the reference type's mode is not the same as the current mode, which means this may not work on mixed 32/64 bit systems. */ && (new_type = build_reference_type (TREE_TYPE (decl))) != 0 && TYPE_MODE (new_type) == GET_MODE (XEXP (DECL_RTL (decl), 0)) /* If this is a PARM_DECL, we can only do it if DECL_INCOMING_RTL is also an indirect and of the same mode and if the object is readonly, the latter condition because we don't want to upset the handling of CICO_LIST. */ && (TREE_CODE (decl) != PARM_DECL || (GET_CODE (DECL_INCOMING_RTL (decl)) == MEM && (TYPE_MODE (new_type) == GET_MODE (XEXP (DECL_INCOMING_RTL (decl), 0))) && TREE_READONLY (decl)))) { new_type = build_qualified_type (new_type, (TYPE_QUALS (new_type) | TYPE_QUAL_CONST)); DECL_POINTS_TO_READONLY_P (decl) = TREE_READONLY (decl); DECL_BY_REF_P (decl) = 1; SET_DECL_RTL (decl, XEXP (DECL_RTL (decl), 0)); TREE_TYPE (decl) = new_type; DECL_MODE (decl) = TYPE_MODE (new_type); DECL_ALIGN (decl) = TYPE_ALIGN (new_type); DECL_SIZE (decl) = TYPE_SIZE (new_type); if (TREE_CODE (decl) == PARM_DECL) DECL_INCOMING_RTL (decl) = XEXP (DECL_INCOMING_RTL (decl), 0); /* If DECL_INITIAL was set, it should be updated to show that the decl is initialized to the address of that thing. Otherwise, just set it to the address of this decl. It needs to be set so that GCC does not think the decl is unused. */ DECL_INITIAL (decl) = build1 (ADDR_EXPR, new_type, DECL_INITIAL (decl) != 0 ? DECL_INITIAL (decl) : decl); } } /* Record the current code position in GNAT_NODE. */ void record_code_position (Node_Id gnat_node) { if (global_bindings_p ()) { /* Make a dummy entry so multiple things at the same location don't end up in the same place. */ add_pending_elaborations (NULL_TREE, NULL_TREE); save_gnu_tree (gnat_node, get_elaboration_location (), 1); } else /* Always emit another insn in case marking the last insn addressable needs some fixups and also for above reason. */ save_gnu_tree (gnat_node, build (RTL_EXPR, void_type_node, NULL_TREE, (tree) emit_note (NOTE_INSN_DELETED)), 1); } /* Insert the code for GNAT_NODE at the position saved for that node. */ void insert_code_for (Node_Id gnat_node) { if (global_bindings_p ()) { push_pending_elaborations (); gnat_to_code (gnat_node); Check_Elaboration_Code_Allowed (gnat_node); insert_elaboration_list (get_gnu_tree (gnat_node)); pop_pending_elaborations (); } else { rtx insns; do_pending_stack_adjust (); start_sequence (); mark_all_temps_used (); gnat_to_code (gnat_node); do_pending_stack_adjust (); insns = get_insns (); end_sequence (); emit_insn_after (insns, RTL_EXPR_RTL (get_gnu_tree (gnat_node))); } } /* Get the alias set corresponding to a type or expression. */ static HOST_WIDE_INT gnat_get_alias_set (tree type) { /* If this is a padding type, use the type of the first field. */ if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type)) return get_alias_set (TREE_TYPE (TYPE_FIELDS (type))); /* If the type is an unconstrained array, use the type of the self-referential array we make. */ else if (TREE_CODE (type) == UNCONSTRAINED_ARRAY_TYPE) return get_alias_set (TREE_TYPE (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (type))))); return -1; } /* GNU_TYPE is a type. Determine if it should be passed by reference by default. */ int default_pass_by_ref (tree gnu_type) { CUMULATIVE_ARGS cum; INIT_CUMULATIVE_ARGS (cum, NULL_TREE, NULL_RTX, 0); /* We pass aggregates by reference if they are sufficiently large. The choice of constant here is somewhat arbitrary. We also pass by reference if the target machine would either pass or return by reference. Strictly speaking, we need only check the return if this is an In Out parameter, but it's probably best to err on the side of passing more things by reference. */ return (0 #ifdef FUNCTION_ARG_PASS_BY_REFERENCE || FUNCTION_ARG_PASS_BY_REFERENCE (cum, TYPE_MODE (gnu_type), gnu_type, 1) #endif || targetm.calls.return_in_memory (gnu_type, NULL_TREE) || (AGGREGATE_TYPE_P (gnu_type) && (! host_integerp (TYPE_SIZE (gnu_type), 1) || 0 < compare_tree_int (TYPE_SIZE (gnu_type), 8 * TYPE_ALIGN (gnu_type))))); } /* GNU_TYPE is the type of a subprogram parameter. Determine from the type if it should be passed by reference. */ int must_pass_by_ref (tree gnu_type) { /* We pass only unconstrained objects, those required by the language to be passed by reference, and objects of variable size. The latter is more efficient, avoids problems with variable size temporaries, and does not produce compatibility problems with C, since C does not have such objects. */ return (TREE_CODE (gnu_type) == UNCONSTRAINED_ARRAY_TYPE || (AGGREGATE_TYPE_P (gnu_type) && TYPE_BY_REFERENCE_P (gnu_type)) || (TYPE_SIZE (gnu_type) != 0 && TREE_CODE (TYPE_SIZE (gnu_type)) != INTEGER_CST)); }