123 lines
4.2 KiB
C
123 lines
4.2 KiB
C
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/* Data structures and functions for streaming trees.
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Copyright (C) 2011-2023 Free Software Foundation, Inc.
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Contributed by Diego Novillo <dnovillo@google.com>
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef GCC_TREE_STREAMER_H
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#define GCC_TREE_STREAMER_H
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#include "streamer-hooks.h"
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#include "data-streamer.h"
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/* Cache of pickled nodes. Used to avoid writing the same node more
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than once. The first time a tree node is streamed out, it is
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entered in this cache. Subsequent references to the same node are
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resolved by looking it up in this cache.
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This is used in two ways:
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- On the writing side, the first time T is added to STREAMER_CACHE,
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a new reference index is created for T and T is emitted on the
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stream. If T needs to be emitted again to the stream, instead of
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pickling it again, the reference index is emitted.
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- On the reading side, the first time T is read from the stream, it
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is reconstructed in memory and a new reference index created for
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T. The reconstructed T is inserted in some array so that when
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the reference index for T is found in the input stream, it can be
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used to look up into the array to get the reconstructed T. */
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struct streamer_tree_cache_d
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{
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/* The mapping between tree nodes and slots into the nodes array. */
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hash_map<tree, unsigned> *node_map;
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/* The nodes pickled so far. */
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vec<tree> nodes;
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/* The node hashes (if available). */
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vec<hashval_t> hashes;
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/* Next index to assign. */
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unsigned next_idx;
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};
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/* In tree-streamer-in.cc. */
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tree streamer_read_string_cst (class data_in *, class lto_input_block *);
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tree streamer_alloc_tree (class lto_input_block *, class data_in *,
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enum LTO_tags);
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void streamer_read_tree_body (class lto_input_block *, class data_in *, tree);
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tree streamer_get_pickled_tree (class lto_input_block *, class data_in *);
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void streamer_read_tree_bitfields (class lto_input_block *,
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class data_in *, tree);
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/* In tree-streamer-out.cc. */
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void streamer_write_string_cst (struct output_block *,
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struct lto_output_stream *, tree);
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void streamer_write_tree_header (struct output_block *, tree);
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void streamer_write_tree_bitfields (struct output_block *, tree);
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void streamer_write_tree_body (struct output_block *, tree);
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void streamer_write_integer_cst (struct output_block *, tree);
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/* In tree-streamer.cc. */
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extern unsigned char streamer_mode_table[1 << 8];
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void streamer_check_handled_ts_structures (void);
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bool streamer_tree_cache_insert (struct streamer_tree_cache_d *, tree,
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hashval_t, unsigned *);
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void streamer_tree_cache_replace_tree (struct streamer_tree_cache_d *, tree,
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unsigned);
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void streamer_tree_cache_append (struct streamer_tree_cache_d *, tree,
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hashval_t);
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bool streamer_tree_cache_lookup (struct streamer_tree_cache_d *, tree,
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unsigned *);
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struct streamer_tree_cache_d *streamer_tree_cache_create (bool, bool, bool);
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void streamer_tree_cache_delete (struct streamer_tree_cache_d *);
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/* Return the tree node at slot IX in CACHE. */
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inline tree
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streamer_tree_cache_get_tree (struct streamer_tree_cache_d *cache, unsigned ix)
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{
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return cache->nodes[ix];
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}
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/* Return the tree hash value at slot IX in CACHE. */
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inline hashval_t
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streamer_tree_cache_get_hash (struct streamer_tree_cache_d *cache, unsigned ix)
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{
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return cache->hashes[ix];
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}
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inline void
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bp_pack_machine_mode (struct bitpack_d *bp, machine_mode mode)
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{
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streamer_mode_table[mode] = 1;
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bp_pack_enum (bp, machine_mode, 1 << 8, mode);
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}
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inline machine_mode
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bp_unpack_machine_mode (struct bitpack_d *bp)
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{
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return (machine_mode)
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((class lto_input_block *)
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bp->stream)->mode_table[bp_unpack_enum (bp, machine_mode, 1 << 8)];
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}
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#endif /* GCC_TREE_STREAMER_H */
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