| /* Data structures and functions for streaming trees. |
| |
| Copyright (C) 2011-2019 Free Software Foundation, Inc. |
| Contributed by Diego Novillo <dnovillo@google.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/>. */ |
| |
| #ifndef GCC_TREE_STREAMER_H |
| #define GCC_TREE_STREAMER_H |
| |
| #include "streamer-hooks.h" |
| #include "data-streamer.h" |
| |
| /* Cache of pickled nodes. Used to avoid writing the same node more |
| than once. The first time a tree node is streamed out, it is |
| entered in this cache. Subsequent references to the same node are |
| resolved by looking it up in this cache. |
| |
| This is used in two ways: |
| |
| - On the writing side, the first time T is added to STREAMER_CACHE, |
| a new reference index is created for T and T is emitted on the |
| stream. If T needs to be emitted again to the stream, instead of |
| pickling it again, the reference index is emitted. |
| |
| - On the reading side, the first time T is read from the stream, it |
| is reconstructed in memory and a new reference index created for |
| T. The reconstructed T is inserted in some array so that when |
| the reference index for T is found in the input stream, it can be |
| used to look up into the array to get the reconstructed T. */ |
| |
| struct streamer_tree_cache_d |
| { |
| /* The mapping between tree nodes and slots into the nodes array. */ |
| hash_map<tree, unsigned> *node_map; |
| |
| /* The nodes pickled so far. */ |
| vec<tree> nodes; |
| /* The node hashes (if available). */ |
| vec<hashval_t> hashes; |
| |
| /* Next index to assign. */ |
| unsigned next_idx; |
| }; |
| |
| /* In tree-streamer-in.c. */ |
| tree streamer_read_string_cst (struct data_in *, struct lto_input_block *); |
| tree streamer_read_chain (struct lto_input_block *, struct data_in *); |
| tree streamer_alloc_tree (struct lto_input_block *, struct data_in *, |
| enum LTO_tags); |
| void streamer_read_tree_body (struct lto_input_block *, struct data_in *, tree); |
| tree streamer_get_pickled_tree (struct lto_input_block *, struct data_in *); |
| void streamer_read_tree_bitfields (struct lto_input_block *, |
| struct data_in *, tree); |
| |
| /* In tree-streamer-out.c. */ |
| void streamer_write_string_cst (struct output_block *, |
| struct lto_output_stream *, tree); |
| void streamer_write_chain (struct output_block *, tree, bool); |
| void streamer_write_tree_header (struct output_block *, tree); |
| void streamer_write_tree_bitfields (struct output_block *, tree); |
| void streamer_write_tree_body (struct output_block *, tree, bool); |
| void streamer_write_integer_cst (struct output_block *, tree, bool); |
| |
| /* In tree-streamer.c. */ |
| extern unsigned char streamer_mode_table[1 << 8]; |
| void streamer_check_handled_ts_structures (void); |
| bool streamer_tree_cache_insert (struct streamer_tree_cache_d *, tree, |
| hashval_t, unsigned *); |
| void streamer_tree_cache_replace_tree (struct streamer_tree_cache_d *, tree, |
| unsigned); |
| void streamer_tree_cache_append (struct streamer_tree_cache_d *, tree, |
| hashval_t); |
| bool streamer_tree_cache_lookup (struct streamer_tree_cache_d *, tree, |
| unsigned *); |
| struct streamer_tree_cache_d *streamer_tree_cache_create (bool, bool, bool); |
| void streamer_tree_cache_delete (struct streamer_tree_cache_d *); |
| |
| /* Return the tree node at slot IX in CACHE. */ |
| |
| static inline tree |
| streamer_tree_cache_get_tree (struct streamer_tree_cache_d *cache, unsigned ix) |
| { |
| return cache->nodes[ix]; |
| } |
| |
| /* Return the tree hash value at slot IX in CACHE. */ |
| |
| static inline hashval_t |
| streamer_tree_cache_get_hash (struct streamer_tree_cache_d *cache, unsigned ix) |
| { |
| return cache->hashes[ix]; |
| } |
| |
| static inline void |
| bp_pack_machine_mode (struct bitpack_d *bp, machine_mode mode) |
| { |
| streamer_mode_table[mode] = 1; |
| bp_pack_enum (bp, machine_mode, 1 << 8, mode); |
| } |
| |
| static inline machine_mode |
| bp_unpack_machine_mode (struct bitpack_d *bp) |
| { |
| return (machine_mode) |
| ((struct lto_input_block *) |
| bp->stream)->mode_table[bp_unpack_enum (bp, machine_mode, 1 << 8)]; |
| } |
| |
| #endif /* GCC_TREE_STREAMER_H */ |