GCC Middle and Back End API Reference
streamer-hooks.h
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1 /* Streamer hooks. Support for adding streamer-specific callbacks to
2  generic streaming routines.
3 
4  Copyright (C) 2011-2013 Free Software Foundation, Inc.
5  Contributed by Diego Novillo <dnovillo@google.com>
6 
7 This file is part of GCC.
8 
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
12 version.
13 
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
17 for more details.
18 
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/>. */
22 
23 #ifndef GCC_STREAMER_HOOKS_H
24 #define GCC_STREAMER_HOOKS_H
25 
26 /* Forward declarations to avoid including unnecessary headers. */
27 struct output_block;
28 struct lto_input_block;
29 struct data_in;
30 
31 /* Streamer hooks. These functions do additional processing as
32  needed by the module. There are two types of callbacks, those that
33  replace the default behavior and those that supplement it.
34 
35  Hooks marked [REQ] are required to be set. Those marked [OPT] may
36  be NULL, if the streamer does not need to implement them. */
37 struct streamer_hooks {
38  /* [REQ] Called by every tree streaming routine that needs to write
39  a tree node. The arguments are: output_block where to write the
40  node, the tree node to write and a boolean flag that should be true
41  if the caller wants to write a reference to the tree, instead of the
42  tree itself. The second boolean parameter specifies this for
43  the tree itself, the first for all siblings that are streamed.
44  The referencing mechanism is up to each streamer to implement. */
45  void (*write_tree) (struct output_block *, tree, bool, bool);
46 
47  /* [REQ] Called by every tree streaming routine that needs to read
48  a tree node. It takes two arguments: an lto_input_block pointing
49  to the buffer where to read from and a data_in instance with tables
50  and descriptors needed by the unpickling routines. It returns the
51  tree instantiated from the stream. */
52  tree (*read_tree) (struct lto_input_block *, struct data_in *);
53 
54  /* [REQ] Called by every streaming routine that needs to read a location. */
55  location_t (*input_location) (struct bitpack_d *, struct data_in *);
56 
57  /* [REQ] Called by every streaming routine that needs to write a location. */
58  void (*output_location) (struct output_block *, struct bitpack_d *, location_t);
59 };
60 
61 #define stream_write_tree(OB, EXPR, REF_P) \
62  streamer_hooks.write_tree (OB, EXPR, REF_P, REF_P)
63 
64 #define stream_write_tree_shallow_non_ref(OB, EXPR, REF_P) \
65  streamer_hooks.write_tree (OB, EXPR, REF_P, false)
66 
67 #define stream_read_tree(IB, DATA_IN) \
68  streamer_hooks.read_tree (IB, DATA_IN)
69 
70 #define stream_input_location(BP, DATA_IN) \
71  streamer_hooks.input_location (BP, DATA_IN)
72 
73 #define stream_output_location(OB, BP, LOC) \
74  streamer_hooks.output_location (OB, BP, LOC)
75 
76 /* Streamer hooks. */
77 extern struct streamer_hooks streamer_hooks;
78 
79 /* In streamer-hooks.c. */
80 void streamer_hooks_init (void);
81 
82 #endif /* GCC_STREAMER_HOOKS_H */