1 /* Default target hook functions.
2 Copyright (C) 2003, 2004 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"
66 default_external_libcall (rtx fun ATTRIBUTE_UNUSED)
68 #ifdef ASM_OUTPUT_EXTERNAL_LIBCALL
69 ASM_OUTPUT_EXTERNAL_LIBCALL(asm_out_file, fun);
74 default_cc_modes_compatible (enum machine_mode m1, enum machine_mode m2)
82 default_promote_function_args (tree fntype ATTRIBUTE_UNUSED)
84 #ifdef PROMOTE_FUNCTION_ARGS
92 default_promote_function_return (tree fntype ATTRIBUTE_UNUSED)
94 #ifdef PROMOTE_FUNCTION_RETURN
102 default_promote_prototypes (tree fntype ATTRIBUTE_UNUSED)
104 if (PROMOTE_PROTOTYPES)
111 default_struct_value_rtx (tree fntype ATTRIBUTE_UNUSED, int incoming)
116 #ifdef STRUCT_VALUE_INCOMING
117 rv = STRUCT_VALUE_INCOMING;
122 #ifndef STRUCT_VALUE_REGNUM
125 rv = gen_rtx_REG (Pmode, STRUCT_VALUE_REGNUM);
135 #ifndef STRUCT_VALUE_REGNUM
138 rv = gen_rtx_REG (Pmode, STRUCT_VALUE_REGNUM);
146 default_return_in_memory (tree type,
147 tree fntype ATTRIBUTE_UNUSED)
149 #ifndef RETURN_IN_MEMORY
150 return (TYPE_MODE (type) == BLKmode);
152 return RETURN_IN_MEMORY (type);
157 default_expand_builtin_saveregs (void)
159 #ifdef EXPAND_BUILTIN_SAVEREGS
160 return EXPAND_BUILTIN_SAVEREGS ();
162 error ("__builtin_saveregs not supported by this target");
168 default_setup_incoming_varargs (CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED,
169 enum machine_mode mode ATTRIBUTE_UNUSED,
170 tree type ATTRIBUTE_UNUSED,
171 int *pretend_arg_size ATTRIBUTE_UNUSED,
172 int second_time ATTRIBUTE_UNUSED)
174 #ifdef SETUP_INCOMING_VARARGS
175 SETUP_INCOMING_VARARGS ((*ca), mode, type, (*pretend_arg_size), second_time);
180 default_strict_argument_naming (CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED)
182 #ifdef STRICT_ARGUMENT_NAMING
183 return STRICT_ARGUMENT_NAMING;
190 default_pretend_outgoing_varargs_named(CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED)
192 #ifdef SETUP_INCOMING_VARARGS
195 return (targetm.calls.setup_incoming_varargs != default_setup_incoming_varargs);
199 /* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */
202 hook_bool_CUMULATIVE_ARGS_true (CUMULATIVE_ARGS * a ATTRIBUTE_UNUSED)
207 /* Generic hook that takes a machine mode and returns true. */
210 hook_bool_machine_mode_true (enum machine_mode a ATTRIBUTE_UNUSED)