1 /* Data structures and declarations used for reading and writing
2 GIMPLE to a file stream.
4 Copyright (C) 2009, 2010 Free Software Foundation, Inc.
5 Contributed by Doug Kwan <dougkwan@google.com>
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 3, or (at your option) any later
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
23 #ifndef GCC_LTO_STREAMER_H
24 #define GCC_LTO_STREAMER_H
26 #include "plugin-api.h"
34 /* Define when debugging the LTO streamer. This causes the writer
35 to output the numeric value for the memory address of the tree node
36 being emitted. When debugging a problem in the reader, check the
37 original address that the writer was emitting using lto_orig_address_get.
38 With this value, set a breakpoint in the writer (e.g., lto_output_tree)
39 to trace how the faulty node is being emitted. */
40 /* #define LTO_STREAMER_DEBUG 1 */
42 /* The encoding for a function consists of the following sections:
50 7) Names for the labels that have names
52 9) The control flow graph.
53 10-11)Gimple for local decls.
54 12) Gimple for the function.
58 2-6) THE GLOBAL DECLS AND TYPES.
60 The global decls and types are encoded in the same way. For each
61 entry, there is word with the offset within the section to the
66 Since most labels do not have names, this section my be of zero
67 length. It consists of an array of string table references, one
68 per label. In the lto code, the labels are given either
69 positive or negative indexes. the positive ones have names and
70 the negative ones do not. The positive index can be used to
71 find the name in this array.
75 10) Index into the local decls. Since local decls can have local
76 decls inside them, they must be read in randomly in order to
77 properly restore them.
79 11-12) GIMPLE FOR THE LOCAL DECLS AND THE FUNCTION BODY.
81 The gimple consists of a set of records.
85 At the top level of (8) is the function. It consists of five
88 LTO_function - The tag.
89 eh tree - This is all of the exception handling regions
90 put out in a post order traversial of the
91 tree. Siblings are output as lists terminated
92 by a 0. The set of fields matches the fields
95 last_basic_block - in uleb128 form.
97 basic blocks - This is the set of basic blocks.
99 zero - The termination of the basic blocks.
103 There are two forms of basic blocks depending on if they are
106 The basic block consists of:
108 LTO_bb1 or LTO_bb0 - The tag.
110 bb->index - the index in uleb128 form.
112 #succs - The number of successors un uleb128 form.
114 the successors - For each edge, a pair. The first of the
115 pair is the index of the successor in
116 uleb128 form and the second are the flags in
119 the statements - A gimple tree, as described above.
120 These are only present for LTO_BB1.
121 Following each statement is an optional
122 exception handling record LTO_eh_region
123 which contains the region number (for
126 zero - This is only present for LTO_BB1 and is used
127 to terminate the statements and exception
128 regions within this block.
132 String are represented in the table as pairs, a length in ULEB128
133 form followed by the data for the string. */
135 /* The string that is the prefix on the section names we make for lto.
136 For decls the DECL_ASSEMBLER_NAME is appended to make the section
137 name for the functions and static_initializers. For other types of
138 sections a '.' and the section type are appended. */
139 #define LTO_SECTION_NAME_PREFIX ".gnu.lto_"
141 #define LTO_major_version 1
142 #define LTO_minor_version 0
144 typedef unsigned char lto_decl_flags_t;
147 /* Data structures used to pack values and bitflags into a vector of
148 words. Used to stream values of a fixed number of bits in a space
150 static unsigned const BITS_PER_BITPACK_WORD = HOST_BITS_PER_WIDE_INT;
152 typedef unsigned HOST_WIDE_INT bitpack_word_t;
153 DEF_VEC_I(bitpack_word_t);
154 DEF_VEC_ALLOC_I(bitpack_word_t, heap);
158 /* Total number of bits packed/unpacked so far. */
161 /* Values are stored contiguously, so there may be internal
162 fragmentation (words with unused bits). Therefore, we need to
163 keep track of the first available bit in the last word of the
165 size_t first_unused_bit;
167 /* Vector of words holding the packed values. */
168 VEC(bitpack_word_t, heap) *values;
171 /* Tags representing the various IL objects written to the bytecode file
172 (GIMPLE statements, basic blocks, EH regions, tree nodes, etc).
174 NOTE, when adding new LTO tags, also update lto_tag_name. */
179 /* Reserve enough entries to fit all the tree and gimple codes handled
180 by the streamer. This guarantees that:
182 1- Given a tree code C:
183 enum LTO_tags tag == C + 1
185 2- Given a gimple code C:
186 enum LTO_tags tag == C + NUM_TREE_CODES + 1
188 Conversely, to map between LTO tags and tree/gimple codes, the
189 reverse operation must be applied. */
190 LTO_bb0 = 1 + NUM_TREE_CODES + LAST_AND_UNUSED_GIMPLE_CODE,
193 /* EH region holding the previous statement. */
196 /* An MD or NORMAL builtin. Only the code and class are streamed out. */
205 /* EH region types. These mirror enum eh_region_type. */
208 LTO_ert_allowed_exceptions,
209 LTO_ert_must_not_throw,
211 /* EH landing pad. */
214 /* EH try/catch node. */
217 /* Special for global streamer. Reference to previously-streamed node. */
218 LTO_tree_pickle_reference,
220 /* References to indexable tree nodes. These objects are stored in
221 tables that are written separately from the function bodies that
222 reference them. This way they can be instantiated even when the
223 referencing functions aren't (e.g., during WPA) and it also allows
224 functions to be copied from one file to another without having
225 to unpickle the body first (the references are location
228 NOTE, do not regroup these values as the grouping is exposed
229 in the range checks done in lto_input_tree. */
230 LTO_field_decl_ref, /* Do not change. */
231 LTO_function_decl_ref,
233 LTO_namespace_decl_ref,
239 LTO_imported_decl_ref,
240 LTO_global_decl_ref, /* Do not change. */
242 /* This tag must always be last. */
247 /* Set of section types that are in an LTO file. This list will grow
248 as the number of IPA passes grows since each IPA pass will need its
249 own section type to store its summary information.
251 When adding a new section type, you must also extend the
252 LTO_SECTION_NAME array in lto-section-in.c. */
253 enum lto_section_type
255 LTO_section_decls = 0,
256 LTO_section_function_body,
257 LTO_section_static_initializer,
260 LTO_section_jump_functions,
261 LTO_section_ipa_pure_const,
262 LTO_section_ipa_reference,
265 LTO_N_SECTION_TYPES /* Must be last. */
268 /* Indices to the various function, type and symbol streams. */
271 LTO_DECL_STREAM_TYPE = 0, /* Must be first. */
272 LTO_DECL_STREAM_FIELD_DECL,
273 LTO_DECL_STREAM_FN_DECL,
274 LTO_DECL_STREAM_VAR_DECL,
275 LTO_DECL_STREAM_TYPE_DECL,
276 LTO_DECL_STREAM_NAMESPACE_DECL,
277 LTO_DECL_STREAM_LABEL_DECL,
279 } lto_decl_stream_e_t;
281 typedef enum ld_plugin_symbol_resolution ld_plugin_symbol_resolution_t;
282 DEF_VEC_I(ld_plugin_symbol_resolution_t);
283 DEF_VEC_ALLOC_I(ld_plugin_symbol_resolution_t, heap);
286 /* Macro to define convenience functions for type and decl streams
287 in lto_file_decl_data. */
288 #define DEFINE_DECL_STREAM_FUNCS(UPPER_NAME, name) \
290 lto_file_decl_data_get_ ## name (struct lto_file_decl_data *data, \
293 struct lto_in_decl_state *state = data->current_decl_state; \
294 gcc_assert (idx < state->streams[LTO_DECL_STREAM_## UPPER_NAME].size); \
295 return state->streams[LTO_DECL_STREAM_## UPPER_NAME].trees[idx]; \
298 static inline unsigned int \
299 lto_file_decl_data_num_ ## name ## s (struct lto_file_decl_data *data) \
301 struct lto_in_decl_state *state = data->current_decl_state; \
302 return state->streams[LTO_DECL_STREAM_## UPPER_NAME].size; \
306 /* Return a char pointer to the start of a data stream for an lto pass
307 or function. The first parameter is the file data that contains
308 the information. The second parameter is the type of information
309 to be obtained. The third parameter is the name of the function
310 and is only used when finding a function body; otherwise it is
311 NULL. The fourth parameter is the length of the data returned. */
312 typedef const char* (lto_get_section_data_f) (struct lto_file_decl_data *,
313 enum lto_section_type,
317 /* Return the data found from the above call. The first three
318 parameters are the same as above. The fourth parameter is the data
319 itself and the fifth is the lenght of the data. */
320 typedef void (lto_free_section_data_f) (struct lto_file_decl_data *,
321 enum lto_section_type,
326 /* Cache of pickled nodes. Used to avoid writing the same node more
327 than once. The first time a tree node is streamed out, it is
328 entered in this cache. Subsequent references to the same node are
329 resolved by looking it up in this cache.
331 This is used in two ways:
333 - On the writing side, the first time T is added to STREAMER_CACHE,
334 a new reference index is created for T and T is emitted on the
335 stream. If T needs to be emitted again to the stream, instead of
336 pickling it again, the reference index is emitted.
338 - On the reading side, the first time T is read from the stream, it
339 is reconstructed in memory and a new reference index created for
340 T. The reconstructed T is inserted in some array so that when
341 the reference index for T is found in the input stream, it can be
342 used to look up into the array to get the reconstructed T. */
343 struct lto_streamer_cache_d
345 /* The mapping between tree nodes and slots into the nodes array. */
348 /* Next available slot in the nodes and offsets arrays. */
351 /* The nodes pickled so far. */
354 /* Offset into the stream where the nodes have been written. */
355 VEC(unsigned,heap) *offsets;
359 /* Structure used as buffer for reading an LTO file. */
360 struct lto_input_block
367 #define LTO_INIT_INPUT_BLOCK(BASE,D,P,L) \
374 #define LTO_INIT_INPUT_BLOCK_PTR(BASE,D,P,L) \
382 /* The is the first part of the record for a function or constructor
386 int16_t major_version;
387 int16_t minor_version;
388 enum lto_section_type section_type;
391 /* The header for a function body. */
392 struct lto_function_header
394 /* The header for all types of sections. */
395 struct lto_header lto_header;
397 /* Number of labels with names. */
398 int32_t num_named_labels;
400 /* Number of labels without names. */
401 int32_t num_unnamed_labels;
403 /* Size compressed or 0 if not compressed. */
404 int32_t compressed_size;
406 /* Size of names for named labels. */
407 int32_t named_label_size;
409 /* Size of the cfg. */
412 /* Size of main gimple body of function. */
415 /* Size of the string table. */
420 /* Structure describing a symbol section. */
421 struct lto_decl_header
423 /* The header for all types of sections. */
424 struct lto_header lto_header;
426 /* Size of region for decl state. */
427 int32_t decl_state_size;
429 /* Number of nodes in globals stream. */
432 /* Size of region for expressions, decls, types, etc. */
435 /* Size of the string table. */
440 /* Statistics gathered during LTO, WPA and LTRANS. */
443 unsigned HOST_WIDE_INT num_input_cgraph_nodes;
444 unsigned HOST_WIDE_INT num_output_cgraph_nodes;
445 unsigned HOST_WIDE_INT num_input_files;
446 unsigned HOST_WIDE_INT num_output_files;
447 unsigned HOST_WIDE_INT num_cgraph_partitions;
448 unsigned HOST_WIDE_INT section_size[LTO_N_SECTION_TYPES];
449 unsigned HOST_WIDE_INT num_function_bodies;
450 unsigned HOST_WIDE_INT num_trees[NUM_TREE_CODES];
451 unsigned HOST_WIDE_INT num_output_il_bytes;
452 unsigned HOST_WIDE_INT num_compressed_il_bytes;
453 unsigned HOST_WIDE_INT num_input_il_bytes;
454 unsigned HOST_WIDE_INT num_uncompressed_il_bytes;
457 /* Encoder data structure used to stream callgraph nodes. */
458 struct lto_cgraph_encoder_d
460 /* Map nodes to reference number. */
461 struct pointer_map_t *map;
463 /* Map reference number to node. */
464 VEC(cgraph_node_ptr,heap) *nodes;
467 typedef struct lto_cgraph_encoder_d *lto_cgraph_encoder_t;
469 /* Mapping from indices to trees. */
470 struct GTY(()) lto_tree_ref_table
472 /* Array of referenced trees . */
473 tree * GTY((length ("%h.size"))) trees;
480 /* Mapping between trees and slots in an array. */
488 /* The lto_tree_ref_encoder struct is used to encode trees into indices. */
490 struct lto_tree_ref_encoder
492 htab_t tree_hash_table; /* Maps pointers to indices. */
493 unsigned int next_index; /* Next available index. */
494 VEC(tree,heap) *trees; /* Maps indices to pointers. */
498 /* Structure to hold states of input scope. */
499 struct GTY(()) lto_in_decl_state
501 /* Array of lto_in_decl_buffers to store type and decls streams. */
502 struct lto_tree_ref_table streams[LTO_N_DECL_STREAMS];
504 /* If this in-decl state is associated with a function. FN_DECL
505 point to the FUNCTION_DECL. */
509 typedef struct lto_in_decl_state *lto_in_decl_state_ptr;
512 /* The structure that holds all of the vectors of global types,
513 decls and cgraph nodes used in the serialization of this file. */
514 struct lto_out_decl_state
516 /* The buffers contain the sets of decls of various kinds and types we have
517 seen so far and the indexes assigned to them. */
518 struct lto_tree_ref_encoder streams[LTO_N_DECL_STREAMS];
520 /* Encoder for cgraph nodes. */
521 lto_cgraph_encoder_t cgraph_node_encoder;
523 /* If this out-decl state belongs to a function, fn_decl points to that
524 function. Otherwise, it is NULL. */
528 typedef struct lto_out_decl_state *lto_out_decl_state_ptr;
530 DEF_VEC_P(lto_out_decl_state_ptr);
531 DEF_VEC_ALLOC_P(lto_out_decl_state_ptr, heap);
533 /* One of these is allocated for each object file that being compiled
534 by lto. This structure contains the tables that are needed by the
535 serialized functions and ipa passes to connect themselves to the
536 global types and decls as they are reconstituted. */
537 struct GTY(()) lto_file_decl_data
539 /* Decl state currently used. */
540 struct lto_in_decl_state *current_decl_state;
542 /* Decl state corresponding to regions outside of any functions
543 in the compilation unit. */
544 struct lto_in_decl_state *global_decl_state;
546 /* Table of cgraph nodes present in this file. */
547 lto_cgraph_encoder_t GTY((skip)) cgraph_node_encoder;
549 /* Hash table maps lto-related section names to location in file. */
550 htab_t GTY((param_is (struct lto_in_decl_state))) function_decl_states;
552 /* The .o file that these offsets relate to. */
553 const char *GTY((skip)) file_name;
555 /* Hash table maps lto-related section names to location in file. */
556 htab_t GTY((skip)) section_hash_table;
558 /* Hash new name of renamed global declaration to its original name. */
559 htab_t GTY((skip)) renaming_hash_table;
562 struct lto_char_ptr_base
567 /* An incore byte stream to buffer the various parts of the function.
568 The entire structure should be zeroed when created. The record
569 consists of a set of blocks. The first sizeof (ptr) bytes are used
570 as a chain, and the rest store the bytes to be written. */
571 struct lto_output_stream
573 /* The pointer to the first block in the stream. */
574 struct lto_char_ptr_base * first_block;
576 /* The pointer to the last and current block in the stream. */
577 struct lto_char_ptr_base * current_block;
579 /* The pointer to where the next char should be written. */
580 char * current_pointer;
582 /* The number of characters left in the current block. */
583 unsigned int left_in_block;
585 /* The block size of the last block allocated. */
586 unsigned int block_size;
588 /* The total number of characters written. */
589 unsigned int total_size;
592 /* The is the first part of the record in an LTO file for many of the
594 struct lto_simple_header
596 /* The header for all types of sections. */
597 struct lto_header lto_header;
599 /* Size of main gimple body of function. */
602 /* Size of main stream when compressed. */
603 int32_t compressed_size;
606 /* A simple output block. This can be used for simple IPA passes that
607 do not need more than one stream. */
608 struct lto_simple_output_block
610 enum lto_section_type section_type;
611 struct lto_out_decl_state *decl_state;
613 /* The stream that the main tree codes are written to. */
614 struct lto_output_stream *main_stream;
617 /* Data structure holding all the data and descriptors used when writing
621 enum lto_section_type section_type;
622 struct lto_out_decl_state *decl_state;
624 /* The stream that the main tree codes are written to. */
625 struct lto_output_stream *main_stream;
627 /* The stream that contains the string table. */
628 struct lto_output_stream *string_stream;
630 /* The stream that contains the cfg. */
631 struct lto_output_stream *cfg_stream;
633 /* The hash table that contains the set of strings we have seen so
634 far and the indexes assigned to them. */
635 htab_t string_hash_table;
637 /* The current cgraph_node that we are currently serializing. Null
638 if we are serializing something else. */
639 struct cgraph_node *cgraph_node;
641 /* These are the last file and line that were seen in the stream.
642 If the current node differs from these, it needs to insert
643 something into the stream and fix these up. */
644 const char *current_file;
648 /* True if writing globals and types. */
651 /* Cache of nodes written in this section. */
652 struct lto_streamer_cache_d *writer_cache;
656 /* Data and descriptors used when reading from an LTO file. */
659 /* The global decls and types. */
660 struct lto_file_decl_data *file_data;
662 /* All of the labels. */
665 /* The string table. */
668 /* The length of the string table. */
669 unsigned int strings_len;
671 /* Number of named labels. Used to find the index of unnamed labels
672 since they share space with the named labels. */
673 unsigned int num_named_labels;
675 /* Number of unnamed labels. */
676 unsigned int num_unnamed_labels;
678 const char *current_file;
682 /* Maps each reference number to the resolution done by the linker. */
683 VEC(ld_plugin_symbol_resolution_t,heap) *globals_resolution;
685 /* Cache of pickled nodes. */
686 struct lto_streamer_cache_d *reader_cache;
690 /* In lto-section-in.c */
691 extern struct lto_input_block * lto_create_simple_input_block (
692 struct lto_file_decl_data *,
693 enum lto_section_type, const char **, size_t *);
695 lto_destroy_simple_input_block (struct lto_file_decl_data *,
696 enum lto_section_type,
697 struct lto_input_block *, const char *, size_t);
698 extern void lto_set_in_hooks (struct lto_file_decl_data **,
699 lto_get_section_data_f *,
700 lto_free_section_data_f *);
701 extern struct lto_file_decl_data **lto_get_file_decl_data (void);
702 extern const char *lto_get_section_data (struct lto_file_decl_data *,
703 enum lto_section_type,
704 const char *, size_t *);
705 extern void lto_free_section_data (struct lto_file_decl_data *,
706 enum lto_section_type,
707 const char *, const char *, size_t);
708 extern unsigned char lto_input_1_unsigned (struct lto_input_block *);
709 extern unsigned HOST_WIDE_INT lto_input_uleb128 (struct lto_input_block *);
710 extern unsigned HOST_WIDEST_INT lto_input_widest_uint_uleb128 (
711 struct lto_input_block *);
712 extern HOST_WIDE_INT lto_input_sleb128 (struct lto_input_block *);
713 extern htab_t lto_create_renaming_table (void);
714 extern void lto_record_renamed_decl (struct lto_file_decl_data *,
715 const char *, const char *);
716 extern const char *lto_get_decl_name_mapping (struct lto_file_decl_data *,
718 extern struct lto_in_decl_state *lto_new_in_decl_state (void);
719 extern void lto_delete_in_decl_state (struct lto_in_decl_state *);
720 extern hashval_t lto_hash_in_decl_state (const void *);
721 extern int lto_eq_in_decl_state (const void *, const void *);
722 extern struct lto_in_decl_state *lto_get_function_in_decl_state (
723 struct lto_file_decl_data *, tree);
725 /* In lto-section-out.c */
726 extern hashval_t lto_hash_decl_slot_node (const void *);
727 extern int lto_eq_decl_slot_node (const void *, const void *);
728 extern hashval_t lto_hash_type_slot_node (const void *);
729 extern int lto_eq_type_slot_node (const void *, const void *);
730 extern void lto_begin_section (const char *, bool);
731 extern void lto_end_section (void);
732 extern void lto_write_stream (struct lto_output_stream *);
733 extern void lto_output_1_stream (struct lto_output_stream *, char);
734 extern void lto_output_data_stream (struct lto_output_stream *, const void *,
736 extern void lto_output_uleb128_stream (struct lto_output_stream *,
737 unsigned HOST_WIDE_INT);
738 extern void lto_output_widest_uint_uleb128_stream (struct lto_output_stream *,
739 unsigned HOST_WIDEST_INT);
740 extern void lto_output_sleb128_stream (struct lto_output_stream *,
742 extern bool lto_output_decl_index (struct lto_output_stream *,
743 struct lto_tree_ref_encoder *,
744 tree, unsigned int *);
745 extern void lto_output_field_decl_index (struct lto_out_decl_state *,
746 struct lto_output_stream *, tree);
747 extern void lto_output_fn_decl_index (struct lto_out_decl_state *,
748 struct lto_output_stream *, tree);
749 extern void lto_output_namespace_decl_index (struct lto_out_decl_state *,
750 struct lto_output_stream *, tree);
751 extern void lto_output_var_decl_index (struct lto_out_decl_state *,
752 struct lto_output_stream *, tree);
753 extern void lto_output_type_decl_index (struct lto_out_decl_state *,
754 struct lto_output_stream *, tree);
755 extern void lto_output_type_ref_index (struct lto_out_decl_state *,
756 struct lto_output_stream *, tree);
757 extern struct lto_simple_output_block *lto_create_simple_output_block (
758 enum lto_section_type);
759 extern void lto_destroy_simple_output_block (struct lto_simple_output_block *);
760 extern struct lto_out_decl_state *lto_new_out_decl_state (void);
761 extern void lto_delete_out_decl_state (struct lto_out_decl_state *);
762 extern struct lto_out_decl_state *lto_get_out_decl_state (void);
763 extern void lto_push_out_decl_state (struct lto_out_decl_state *);
764 extern struct lto_out_decl_state *lto_pop_out_decl_state (void);
765 extern void lto_record_function_out_decl_state (tree,
766 struct lto_out_decl_state *);
769 /* In lto-streamer.c. */
770 extern const char *lto_tag_name (enum LTO_tags);
771 extern bitmap lto_bitmap_alloc (void);
772 extern void lto_bitmap_free (bitmap);
773 extern char *lto_get_section_name (int, const char *);
774 extern void print_lto_report (void);
775 extern struct bitpack_d *bitpack_create (void);
776 extern void bitpack_delete (struct bitpack_d *);
777 extern void bp_pack_value (struct bitpack_d *, bitpack_word_t, unsigned);
778 extern bitpack_word_t bp_unpack_value (struct bitpack_d *, unsigned);
779 extern bool lto_streamer_cache_insert (struct lto_streamer_cache_d *, tree,
781 extern bool lto_streamer_cache_insert_at (struct lto_streamer_cache_d *, tree,
783 extern bool lto_streamer_cache_lookup (struct lto_streamer_cache_d *, tree,
785 extern tree lto_streamer_cache_get (struct lto_streamer_cache_d *, int);
786 extern struct lto_streamer_cache_d *lto_streamer_cache_create (void);
787 extern void lto_streamer_cache_delete (struct lto_streamer_cache_d *);
788 extern void lto_streamer_init (void);
789 extern bool gate_lto_out (void);
790 #ifdef LTO_STREAMER_DEBUG
791 extern void lto_orig_address_map (tree, intptr_t);
792 extern intptr_t lto_orig_address_get (tree);
793 extern void lto_orig_address_remove (tree);
795 extern void lto_check_version (int, int);
798 /* In lto-streamer-in.c */
799 extern void lto_input_cgraph (struct lto_file_decl_data *, const char *);
800 extern void lto_init_reader (void);
801 extern tree lto_input_tree (struct lto_input_block *, struct data_in *);
802 extern void lto_input_function_body (struct lto_file_decl_data *, tree,
804 extern void lto_input_constructors_and_inits (struct lto_file_decl_data *,
806 extern struct bitpack_d *lto_input_bitpack (struct lto_input_block *);
807 extern void lto_init_reader (void);
808 extern struct data_in *lto_data_in_create (struct lto_file_decl_data *,
809 const char *, unsigned,
810 VEC(ld_plugin_symbol_resolution_t,heap) *);
811 extern void lto_data_in_delete (struct data_in *);
814 /* In lto-streamer-out.c */
815 extern void lto_register_decl_definition (tree, struct lto_file_decl_data *);
816 extern struct output_block *create_output_block (enum lto_section_type);
817 extern void destroy_output_block (struct output_block *);
818 extern void lto_output_tree (struct output_block *, tree, bool);
819 extern void lto_output_bitpack (struct lto_output_stream *, struct bitpack_d *);
820 extern void produce_asm (struct output_block *ob, tree fn);
823 /* In lto-cgraph.c */
824 struct cgraph_node *lto_cgraph_encoder_deref (lto_cgraph_encoder_t, int);
825 int lto_cgraph_encoder_lookup (lto_cgraph_encoder_t, struct cgraph_node *);
826 lto_cgraph_encoder_t lto_cgraph_encoder_new (void);
827 int lto_cgraph_encoder_encode (lto_cgraph_encoder_t, struct cgraph_node *);
828 void lto_cgraph_encoder_delete (lto_cgraph_encoder_t encoder);
829 void output_cgraph (cgraph_node_set);
830 void input_cgraph (void);
831 void output_varpool (varpool_node_set);
832 void input_varpool (void);
835 /* In lto-symtab.c. */
836 extern void lto_symtab_register_decl (tree, ld_plugin_symbol_resolution_t,
837 struct lto_file_decl_data *);
838 extern void lto_symtab_merge_decls (void);
839 extern void lto_symtab_merge_cgraph_nodes (void);
840 extern tree lto_symtab_prevailing_decl (tree decl);
841 extern enum ld_plugin_symbol_resolution lto_symtab_get_resolution (tree decl);
845 extern void lto_register_user_option (size_t, const char *, int, int);
846 extern void lto_read_file_options (struct lto_file_decl_data *);
847 extern void lto_write_options (void);
848 extern void lto_reissue_options (void);
849 void lto_clear_user_options (void);
850 void lto_clear_file_options (void);
853 /* In lto-wpa-fixup.c */
854 void lto_mark_nothrow_fndecl (tree);
855 void lto_fixup_nothrow_decls (void);
858 /* Statistics gathered during LTO, WPA and LTRANS. */
859 extern struct lto_stats_d lto_stats;
861 /* Section names corresponding to the values of enum lto_section_type. */
862 extern const char *lto_section_name[];
864 /* Holds all the out decl states of functions output so far in the
865 current output file. */
866 extern VEC(lto_out_decl_state_ptr, heap) *lto_function_decl_states;
868 /* Return true if LTO tag TAG corresponds to a tree code. */
870 lto_tag_is_tree_code_p (enum LTO_tags tag)
872 return tag > LTO_null && (unsigned) tag <= NUM_TREE_CODES;
876 /* Return true if LTO tag TAG corresponds to a gimple code. */
878 lto_tag_is_gimple_code_p (enum LTO_tags tag)
880 return (unsigned) tag >= NUM_TREE_CODES + 1
881 && (unsigned) tag < 1 + NUM_TREE_CODES + LAST_AND_UNUSED_GIMPLE_CODE;
885 /* Return the LTO tag corresponding to gimple code CODE. See enum
886 LTO_tags for details on the conversion. */
887 static inline enum LTO_tags
888 lto_gimple_code_to_tag (enum gimple_code code)
890 return (enum LTO_tags) ((unsigned) code + NUM_TREE_CODES + 1);
894 /* Return the GIMPLE code corresponding to TAG. See enum LTO_tags for
895 details on the conversion. */
896 static inline enum gimple_code
897 lto_tag_to_gimple_code (enum LTO_tags tag)
899 gcc_assert (lto_tag_is_gimple_code_p (tag));
900 return (enum gimple_code) ((unsigned) tag - NUM_TREE_CODES - 1);
904 /* Return the LTO tag corresponding to tree code CODE. See enum
905 LTO_tags for details on the conversion. */
906 static inline enum LTO_tags
907 lto_tree_code_to_tag (enum tree_code code)
909 return (enum LTO_tags) ((unsigned) code + 1);
913 /* Return the tree code corresponding to TAG. See enum LTO_tags for
914 details on the conversion. */
915 static inline enum tree_code
916 lto_tag_to_tree_code (enum LTO_tags tag)
918 gcc_assert (lto_tag_is_tree_code_p (tag));
919 return (enum tree_code) ((unsigned) tag - 1);
922 /* Initialize an lto_out_decl_buffer ENCODER. */
924 lto_init_tree_ref_encoder (struct lto_tree_ref_encoder *encoder,
925 htab_hash hash_fn, htab_eq eq_fn)
927 encoder->tree_hash_table = htab_create (37, hash_fn, eq_fn, free);
928 encoder->next_index = 0;
929 encoder->trees = NULL;
933 /* Destory an lto_tree_ref_encoder ENCODER by freeing its contents. The
934 memory used by ENCODER is not freed by this function. */
936 lto_destroy_tree_ref_encoder (struct lto_tree_ref_encoder *encoder)
938 /* Hash table may be delete already. */
939 if (encoder->tree_hash_table)
940 htab_delete (encoder->tree_hash_table);
941 VEC_free (tree, heap, encoder->trees);
944 /* Return the number of trees encoded in ENCODER. */
945 static inline unsigned int
946 lto_tree_ref_encoder_size (struct lto_tree_ref_encoder *encoder)
948 return VEC_length (tree, encoder->trees);
951 /* Return the IDX-th tree in ENCODER. */
953 lto_tree_ref_encoder_get_tree (struct lto_tree_ref_encoder *encoder,
956 return VEC_index (tree, encoder->trees, idx);
960 /* Return true if LABEL should be emitted in the global context. */
962 emit_label_in_global_context_p (tree label)
964 return DECL_NONLOCAL (label) || FORCED_LABEL (label);
967 /* Return true if tree node EXPR should be streamed as a builtin. For
968 these nodes, we just emit the class and function code. */
970 lto_stream_as_builtin_p (tree expr)
972 return (TREE_CODE (expr) == FUNCTION_DECL
973 && DECL_IS_BUILTIN (expr)
974 && (DECL_BUILT_IN_CLASS (expr) == BUILT_IN_NORMAL
975 || DECL_BUILT_IN_CLASS (expr) == BUILT_IN_MD));
978 /* Return true if EXPR is a tree node that can be written to disk. */
980 lto_is_streamable (tree expr)
982 enum tree_code code = TREE_CODE (expr);
984 /* Notice that we reject SSA_NAMEs as well. We only emit the SSA
985 name version in lto_output_tree_ref (see output_ssa_names). */
986 return !is_lang_specific (expr)
990 && code != MODIFY_EXPR
992 && code != TARGET_EXPR
994 && code != WITH_CLEANUP_EXPR
995 && code != STATEMENT_LIST
996 && (code == CASE_LABEL_EXPR
998 || TREE_CODE_CLASS (code) != tcc_statement);
1001 DEFINE_DECL_STREAM_FUNCS (TYPE, type)
1002 DEFINE_DECL_STREAM_FUNCS (FIELD_DECL, field_decl)
1003 DEFINE_DECL_STREAM_FUNCS (FN_DECL, fn_decl)
1004 DEFINE_DECL_STREAM_FUNCS (VAR_DECL, var_decl)
1005 DEFINE_DECL_STREAM_FUNCS (TYPE_DECL, type_decl)
1006 DEFINE_DECL_STREAM_FUNCS (NAMESPACE_DECL, namespace_decl)
1007 DEFINE_DECL_STREAM_FUNCS (LABEL_DECL, label_decl)
1009 #endif /* GCC_LTO_STREAMER_H */