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/* Implementation of class record_layout.
Copyright (C) 2022-2023 Free Software Foundation, Inc.
Contributed by David Malcolm <dmalcolm@redhat.com>.
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/>. */
#include "config.h"
#define INCLUDE_MEMORY
#include "system.h"
#include "coretypes.h"
#include "tree.h"
#include "function.h"
#include "basic-block.h"
#include "gimple.h"
#include "diagnostic.h"
#include "tree-diagnostic.h"
#include "analyzer/analyzer.h"
#include "analyzer/record-layout.h"
#if ENABLE_ANALYZER
namespace ana {
/* class record_layout. */
record_layout::record_layout (tree record_type)
{
gcc_assert (TREE_CODE (record_type) == RECORD_TYPE);
for (tree iter = TYPE_FIELDS (record_type); iter != NULL_TREE;
iter = DECL_CHAIN (iter))
{
if (TREE_CODE (iter) == FIELD_DECL)
{
int iter_field_offset = int_bit_position (iter);
bit_size_t size_in_bits;
if (!int_size_in_bits (TREE_TYPE (iter), &size_in_bits))
size_in_bits = 0;
maybe_pad_to (iter_field_offset);
/* Add field. */
m_items.safe_push (item (bit_range (iter_field_offset,
size_in_bits),
iter, false));
}
}
/* Add any trailing padding. */
bit_size_t size_in_bits;
if (int_size_in_bits (record_type, &size_in_bits))
maybe_pad_to (size_in_bits);
}
void
record_layout::dump_to_pp (pretty_printer *pp) const
{
unsigned i;
item *it;
FOR_EACH_VEC_ELT (m_items, i, it)
{
it->dump_to_pp (pp);
pp_newline (pp);
}
}
void
record_layout::dump () const
{
pretty_printer pp;
pp_format_decoder (&pp) = default_tree_printer;
pp.buffer->stream = stderr;
dump_to_pp (&pp);
pp_flush (&pp);
}
const record_layout::item *
record_layout::get_item_at (bit_offset_t offset) const
{
unsigned i;
item *it;
FOR_EACH_VEC_ELT (m_items, i, it)
if (it->contains_p (offset))
return it;
return NULL;
}
/* Subroutine of ctor. Add padding item to NEXT_OFFSET if necessary. */
void
record_layout::maybe_pad_to (bit_offset_t next_offset)
{
if (m_items.length () > 0)
{
const item &last_item = m_items[m_items.length () - 1];
bit_offset_t offset_after_last_item
= last_item.get_next_bit_offset ();
if (next_offset > offset_after_last_item)
{
bit_size_t padding_size
= next_offset - offset_after_last_item;
m_items.safe_push (item (bit_range (offset_after_last_item,
padding_size),
last_item.m_field, true));
}
}
}
} // namespace ana
#endif /* #if ENABLE_ANALYZER */
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