1 /* Default target hook functions.
2 Copyright (C) 2003 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 2, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING. If not, write to the Free
18 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
21 /* The migration of target macros to target hooks works as follows:
23 1. Create a target hook that uses the existing target macros to
24 implement the same functionality.
26 2. Convert all the MI files to use the hook instead of the macro.
28 3. Repeat for a majority of the remaining target macros. This will
31 4. Tell target maintainers to start migrating.
33 5. Eventually convert the backends to override the hook instead of
34 defining the macros. This will take some time too.
36 6. TBD when, poison the macros. Unmigrated targets will break at
39 Note that we expect steps 1-3 to be done by the people that
40 understand what the MI does with each macro, and step 5 to be done
41 by the target maintainers for their respective targets.
43 Note that steps 1 and 2 don't have to be done together, but no
44 target can override the new hook until step 2 is complete for it.
46 Once the macros are poisoned, we will revert to the old migration
47 rules - migrate the macro, callers, and targets all at once. This
48 comment can thus be removed at that point. */
52 #include "coretypes.h"
63 #include "target-def.h"
64 #include "insn-config.h"
69 default_external_libcall (rtx fun ATTRIBUTE_UNUSED)
71 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
72 ASM_OUTPUT_EXTERNAL_LIBCALL(asm_out_file, fun);
77 default_promote_function_args (tree fntype ATTRIBUTE_UNUSED)
79 #ifdef PROMOTE_FUNCTION_ARGS
87 default_promote_function_return (tree fntype ATTRIBUTE_UNUSED)
89 #ifdef PROMOTE_FUNCTION_RETURN
97 default_promote_prototypes (tree fntype ATTRIBUTE_UNUSED)
99 if (PROMOTE_PROTOTYPES)
106 default_struct_value_rtx (tree fntype ATTRIBUTE_UNUSED, int incoming)
111 #ifdef STRUCT_VALUE_INCOMING
112 rv = STRUCT_VALUE_INCOMING;
114 #ifdef STRUCT_VALUE_INCOMING_REGNUM
115 rv = gen_rtx_REG (Pmode, STRUCT_VALUE_INCOMING_REGNUM);
120 #ifndef STRUCT_VALUE_REGNUM
123 rv = gen_rtx_REG (Pmode, STRUCT_VALUE_REGNUM);
134 #ifndef STRUCT_VALUE_REGNUM
137 rv = gen_rtx_REG (Pmode, STRUCT_VALUE_REGNUM);
145 default_return_in_memory (tree type,
146 tree fntype ATTRIBUTE_UNUSED)
148 #ifndef RETURN_IN_MEMORY
149 return (TYPE_MODE (type) == BLKmode);
151 return RETURN_IN_MEMORY (type);
156 default_expand_builtin_saveregs (void)
158 #ifdef EXPAND_BUILTIN_SAVEREGS
159 return EXPAND_BUILTIN_SAVEREGS ();
161 error ("__builtin_saveregs not supported by this target");
167 default_setup_incoming_varargs (CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED,
168 enum machine_mode mode ATTRIBUTE_UNUSED,
169 tree type ATTRIBUTE_UNUSED,
170 int *pretend_arg_size ATTRIBUTE_UNUSED,
171 int second_time ATTRIBUTE_UNUSED)
173 #ifdef SETUP_INCOMING_VARARGS
174 SETUP_INCOMING_VARARGS ((*ca), mode, type, (*pretend_arg_size), second_time);
179 default_strict_argument_naming (CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED)
181 #ifdef STRICT_ARGUMENT_NAMING
182 return STRICT_ARGUMENT_NAMING;
189 default_pretend_outgoing_varargs_named(CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED)
191 #ifdef PRETEND_OUTGOING_VARARGS_NAMED
192 return PRETEND_OUTGOING_VARARGS_NAMED;
194 #ifdef SETUP_INCOMING_VARARGS
197 return (targetm.calls.setup_incoming_varargs != default_setup_incoming_varargs);
202 /* A SYMBOL_REF for a local symbol. Used by default_direct_pool_load_p. */
204 static GTY(()) rtx pool_symbol;
206 /* See whether a local symbol is a valid address for MODE. If so, assume
207 that constant pool symbols are also valid addresses, otherwise assume
210 ??? This is only an approximation. We can't test constant pool
211 symbols directly without forcing something into the constant pool. */
214 default_direct_pool_load_p (enum machine_mode mode)
216 if (pool_symbol == 0)
220 ASM_GENERATE_INTERNAL_LABEL (label, "LC", 0);
221 pool_symbol = gen_rtx_SYMBOL_REF (Pmode, ggc_strdup (label));
222 SYMBOL_REF_FLAGS (pool_symbol) = SYMBOL_FLAG_LOCAL;
224 return memory_address_p (mode, pool_symbol);
227 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */
230 hook_bool_CUMULATIVE_ARGS_true (CUMULATIVE_ARGS * a ATTRIBUTE_UNUSED)
235 /* Generic hook that takes a machine mode and returns true. */
238 hook_bool_machine_mode_true (enum machine_mode a ATTRIBUTE_UNUSED)
243 #include "gt-targhooks.h"