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/* Declarations and data types for RTL call insn generation.
Copyright (C) 2013-2020 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);
extern bool cxx17_empty_base_field_p (const_tree);
#endif // GCC_CALLS_H
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