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1 : /* Declarations and data types for RTL call insn generation.
2 : Copyright (C) 2013-2026 Free Software Foundation, Inc.
3 :
4 : This file is part of GCC.
5 :
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
9 : version.
10 :
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
14 : for more details.
15 :
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/>. */
19 :
20 : #ifndef GCC_CALLS_H
21 : #define GCC_CALLS_H
22 :
23 : /* Describes a function argument.
24 :
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.
29 :
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
35 : {
36 : public:
37 18235480 : function_arg_info ()
38 9117692 : : type (NULL_TREE), mode (VOIDmode), named (false),
39 9117788 : pass_by_reference (false)
40 : {}
41 :
42 : /* Initialize an argument of mode MODE, either before or after promotion. */
43 320945 : function_arg_info (machine_mode mode, bool named)
44 320945 : : type (NULL_TREE), mode (mode), named (named), pass_by_reference (false)
45 : {}
46 :
47 : /* Initialize an unpromoted argument of type TYPE. */
48 18012718 : function_arg_info (tree type, bool named)
49 18012718 : : type (type), mode (TYPE_MODE (type)), named (named),
50 18012718 : pass_by_reference (false)
51 18012718 : {}
52 :
53 : /* Initialize an argument with explicit properties. */
54 412229637 : function_arg_info (tree type, machine_mode mode, bool named)
55 412229637 : : type (type), mode (mode), named (named), pass_by_reference (false)
56 : {}
57 :
58 : /* Return true if the gimple-level type is an aggregate. */
59 : bool aggregate_type_p () const { return type && AGGREGATE_TYPE_P (type); }
60 :
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.
63 :
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
67 : {
68 : if (type)
69 : return int_size_in_bytes (type);
70 : return GET_MODE_SIZE (mode);
71 : }
72 :
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.
75 :
76 : Use this function when MODE is the mode of the type after promotion. */
77 42924160 : poly_int64 promoted_size_in_bytes () const
78 : {
79 42924160 : if (mode == BLKmode)
80 794829 : return int_size_in_bytes (type);
81 84258662 : return GET_MODE_SIZE (mode);
82 : }
83 :
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; }
87 :
88 : /* Return a function_arg_info that represents the end of the
89 : argument list. */
90 5935021 : static function_arg_info end_marker ()
91 : {
92 5935021 : return function_arg_info (void_type_node, /*named=*/true);
93 : }
94 :
95 : /* The type of the argument, or null if not known (which is true for
96 : libgcc support functions). */
97 : tree type;
98 :
99 : /* The mode of the argument. Depending on context, this might be
100 : the mode of the argument type or the mode after promotion. */
101 : machine_mode mode;
102 :
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;
107 :
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;
111 : };
112 :
113 : extern int flags_from_decl_or_type (const_tree);
114 : extern int call_expr_flags (const_tree);
115 : extern bool 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);
126 :
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 *);
134 :
135 : extern rtx rtx_for_static_chain (const_tree, bool);
136 : extern bool cxx17_empty_base_field_p (const_tree);
137 :
138 : #endif // GCC_CALLS_H
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