aboutsummaryrefslogtreecommitdiff
path: root/gcc/calls.h
blob: a782a7d3695acccb5c68c0925dcd532baa43292a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
/* Declarations and data types for RTL call insn generation.
   Copyright (C) 2013-2019 Free Software Foundation, Inc.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.

GCC is distributed in the hope that it will be useful, but WITHOUT 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
along with GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

#ifndef GCC_CALLS_H
#define GCC_CALLS_H

/* Describes a function argument.

   Each argument conceptually has a gimple-level type.  Usually this type
   is available directly as a tree via the TYPE field, but when calling
   libgcc support functions it might instead be inferred from a mode,
   in which case the type isn't available directly.

   This gimple-level type might go through promotion before being passed to
   the target function.  Depending on the context, the MODE field is either
   the mode of the gimple-level type (whether explicitly given or not)
   or the mode after promotion has been performed.  */
class function_arg_info
{
public:
  function_arg_info ()
    : type (NULL_TREE), mode (VOIDmode), named (false),
      pass_by_reference (false)
  {}

  /* Initialize an argument of mode MODE, either before or after promotion.  */
  function_arg_info (machine_mode mode, bool named)
    : type (NULL_TREE), mode (mode), named (named), pass_by_reference (false)
  {}

  /* Initialize an unpromoted argument of type TYPE.  */
  function_arg_info (tree type, bool named)
    : type (type), mode (TYPE_MODE (type)), named (named),
      pass_by_reference (false)
  {}

  /* Initialize an argument with explicit properties.  */
  function_arg_info (tree type, machine_mode mode, bool named)
    : type (type), mode (mode), named (named), pass_by_reference (false)
  {}

  /* Return true if the gimple-level type is an aggregate.  */
  bool aggregate_type_p () const { return type && AGGREGATE_TYPE_P (type); }

  /* Return the size of the gimple-level type, or -1 if the size is
     variable or otherwise not representable as a poly_int64.

     Use this function when MODE is the mode of the type before promotion,
     or in any context if the target never promotes function arguments.  */
  poly_int64 type_size_in_bytes () const
  {
    if (type)
      return int_size_in_bytes (type);
    return GET_MODE_SIZE (mode);
  }

  /* Return the size of the argument after promotion, or -1 if the size
     is variable or otherwise not representable as a poly_int64.

     Use this function when MODE is the mode of the type after promotion.  */
  poly_int64 promoted_size_in_bytes () const
  {
    if (mode == BLKmode)
      return int_size_in_bytes (type);
    return GET_MODE_SIZE (mode);
  }

  /* True if the argument represents the end of the argument list,
     as returned by end_marker ().  */
  bool end_marker_p () const { return mode == VOIDmode; }

  /* Return a function_arg_info that represents the end of the
     argument list.  */
  static function_arg_info end_marker ()
  {
    return function_arg_info (void_type_node, /*named=*/true);
  }

  /* The type of the argument, or null if not known (which is true for
     libgcc support functions).  */
  tree type;

  /* The mode of the argument.  Depending on context, this might be
     the mode of the argument type or the mode after promotion.  */
  machine_mode mode;

  /* True if the argument is treated as a named argument, false if it is
     treated as an unnamed variadic argument (i.e. one passed through
     "...").  See also TARGET_STRICT_ARGUMENT_NAMING.  */
  unsigned int named : 1;

  /* True if we have decided to pass the argument by reference, in which case
     the function_arg_info describes a pointer to the original argument.  */
  unsigned int pass_by_reference : 1;
};

extern int flags_from_decl_or_type (const_tree);
extern int call_expr_flags (const_tree);
extern int setjmp_call_p (const_tree);
extern bool gimple_maybe_alloca_call_p (const gimple *);
extern bool gimple_alloca_call_p (const gimple *);
extern bool alloca_call_p (const_tree);
extern bool must_pass_in_stack_var_size (const function_arg_info &);
extern bool must_pass_in_stack_var_size_or_pad (const function_arg_info &);
extern bool must_pass_va_arg_in_stack (tree);
extern rtx prepare_call_address (tree, rtx, rtx, rtx *, int, int);
extern bool shift_return_value (machine_mode, bool, rtx);
extern rtx expand_call (tree, rtx, int);
extern void fixup_tail_calls (void);

extern bool pass_by_reference (CUMULATIVE_ARGS *, function_arg_info);
extern bool pass_va_arg_by_reference (tree);
extern bool apply_pass_by_reference_rules (CUMULATIVE_ARGS *,
					   function_arg_info &);
extern bool reference_callee_copied (CUMULATIVE_ARGS *,
				     const function_arg_info &);
extern void maybe_warn_alloc_args_overflow (tree, tree, tree[2], int[2]);
extern tree get_attr_nonstring_decl (tree, tree * = NULL);
extern void maybe_warn_nonstring_arg (tree, tree);
extern bool get_size_range (tree, tree[2], bool = false);
extern rtx rtx_for_static_chain (const_tree, bool);

#endif // GCC_CALLS_H