1 /* Declarations and data types for RTL call insn generation.
2 Copyright (C) 2013-2022 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 3, 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 COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
23 /* Describes a function argument.
25 Each argument conceptually has a gimple-level type. Usually this type
26 is available directly as a tree via the TYPE field, but when calling
27 libgcc support functions it might instead be inferred from a mode,
28 in which case the type isn't available directly.
30 This gimple-level type might go through promotion before being passed to
31 the target function. Depending on the context, the MODE field is either
32 the mode of the gimple-level type (whether explicitly given or not)
33 or the mode after promotion has been performed. */
34 class function_arg_info
38 : type (NULL_TREE
), mode (VOIDmode
), named (false),
39 pass_by_reference (false)
42 /* Initialize an argument of mode MODE, either before or after promotion. */
43 function_arg_info (machine_mode mode
, bool named
)
44 : type (NULL_TREE
), mode (mode
), named (named
), pass_by_reference (false)
47 /* Initialize an unpromoted argument of type TYPE. */
48 function_arg_info (tree type
, bool named
)
49 : type (type
), mode (TYPE_MODE (type
)), named (named
),
50 pass_by_reference (false)
53 /* Initialize an argument with explicit properties. */
54 function_arg_info (tree type
, machine_mode mode
, bool named
)
55 : type (type
), mode (mode
), named (named
), pass_by_reference (false)
58 /* Return true if the gimple-level type is an aggregate. */
59 bool aggregate_type_p () const { return type
&& AGGREGATE_TYPE_P (type
); }
61 /* Return the size of the gimple-level type, or -1 if the size is
62 variable or otherwise not representable as a poly_int64.
64 Use this function when MODE is the mode of the type before promotion,
65 or in any context if the target never promotes function arguments. */
66 poly_int64
type_size_in_bytes () const
69 return int_size_in_bytes (type
);
70 return GET_MODE_SIZE (mode
);
73 /* Return the size of the argument after promotion, or -1 if the size
74 is variable or otherwise not representable as a poly_int64.
76 Use this function when MODE is the mode of the type after promotion. */
77 poly_int64
promoted_size_in_bytes () const
80 return int_size_in_bytes (type
);
81 return GET_MODE_SIZE (mode
);
84 /* True if the argument represents the end of the argument list,
85 as returned by end_marker (). */
86 bool end_marker_p () const { return mode
== VOIDmode
; }
88 /* Return a function_arg_info that represents the end of the
90 static function_arg_info
end_marker ()
92 return function_arg_info (void_type_node
, /*named=*/true);
95 /* The type of the argument, or null if not known (which is true for
96 libgcc support functions). */
99 /* The mode of the argument. Depending on context, this might be
100 the mode of the argument type or the mode after promotion. */
103 /* True if the argument is treated as a named argument, false if it is
104 treated as an unnamed variadic argument (i.e. one passed through
105 "..."). See also TARGET_STRICT_ARGUMENT_NAMING. */
106 unsigned int named
: 1;
108 /* True if we have decided to pass the argument by reference, in which case
109 the function_arg_info describes a pointer to the original argument. */
110 unsigned int pass_by_reference
: 1;
113 extern int flags_from_decl_or_type (const_tree
);
114 extern int call_expr_flags (const_tree
);
115 extern int setjmp_call_p (const_tree
);
116 extern bool gimple_maybe_alloca_call_p (const gimple
*);
117 extern bool gimple_alloca_call_p (const gimple
*);
118 extern bool alloca_call_p (const_tree
);
119 extern bool must_pass_in_stack_var_size (const function_arg_info
&);
120 extern bool must_pass_in_stack_var_size_or_pad (const function_arg_info
&);
121 extern bool must_pass_va_arg_in_stack (tree
);
122 extern rtx
prepare_call_address (tree
, rtx
, rtx
, rtx
*, int, int);
123 extern bool shift_return_value (machine_mode
, bool, rtx
);
124 extern rtx
expand_call (tree
, rtx
, int);
125 extern void fixup_tail_calls (void);
127 extern bool pass_by_reference (CUMULATIVE_ARGS
*, function_arg_info
);
128 extern bool pass_va_arg_by_reference (tree
);
129 extern bool apply_pass_by_reference_rules (CUMULATIVE_ARGS
*,
130 function_arg_info
&);
131 extern bool reference_callee_copied (CUMULATIVE_ARGS
*,
132 const function_arg_info
&);
133 extern void maybe_complain_about_tail_call (tree
, const char *);
135 extern rtx
rtx_for_static_chain (const_tree
, bool);
136 extern bool cxx17_empty_base_field_p (const_tree
);
138 #endif // GCC_CALLS_H