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30f4db0d | 1 | /* Insn note definitions. |
2 | Copyright (C) 2004 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify it under | |
7 | the terms of the GNU General Public License as published by the Free | |
8 | Software Foundation; either version 2, or (at your option) any later | |
9 | version. | |
10 | ||
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GCC; see the file COPYING. If not, write to the Free | |
18 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
19 | 02111-1307, USA. */ | |
20 | ||
21 | /* This file defines all the codes that may appear in the | |
22 | NOTE_LINE_NUMBER field of a NOTE insn for kinds of notes that are | |
23 | not line numbers. Source files define DEF_INSN_NOTE appropriately | |
24 | before including this file. | |
25 | ||
26 | We are slowly removing the concept of insn-chain notes from the | |
27 | compiler. Adding new codes to this file is STRONGLY DISCOURAGED. | |
28 | If you think you need one, look for other ways to express what you | |
29 | mean, such as register notes or bits in the basic-block structure. */ | |
30 | ||
31 | /* Shorthand. */ | |
32 | #define INSN_NOTE(NAME) DEF_INSN_NOTE (NOTE_INSN_##NAME) | |
33 | ||
34 | /* This note is used to get rid of an insn when it isn't safe to patch | |
35 | the insn out of the chain. */ | |
36 | INSN_NOTE (DELETED) | |
37 | ||
38 | /* Generated in place of user-declared labels when they are deleted. */ | |
39 | INSN_NOTE (DELETED_LABEL) | |
40 | ||
41 | /* These are used to mark the beginning and end of a lexical block. | |
42 | See NOTE_BLOCK and reorder_blocks. */ | |
43 | INSN_NOTE (BLOCK_BEG) | |
44 | INSN_NOTE (BLOCK_END) | |
45 | ||
46 | /* These mark the extremes of a loop. */ | |
47 | INSN_NOTE (LOOP_BEG) | |
48 | INSN_NOTE (LOOP_END) | |
49 | ||
30f4db0d | 50 | /* This note indicates the start of the real body of the function, |
51 | i.e. the point just after all of the parms have been moved into | |
52 | their homes, etc. */ | |
53 | INSN_NOTE (FUNCTION_BEG) | |
54 | ||
55 | /* This kind of note is generated at the end of the function body, | |
56 | just before the return insn or return label. In an optimizing | |
57 | compilation it is deleted by the first jump optimization, after | |
58 | enabling that optimizer to determine whether control can fall | |
59 | off the end of the function body without a return statement. */ | |
60 | INSN_NOTE (FUNCTION_END) | |
61 | ||
62 | /* This marks the point immediately after the last prologue insn. */ | |
63 | INSN_NOTE (PROLOGUE_END) | |
64 | ||
65 | /* This marks the point immediately prior to the first epilogue insn. */ | |
66 | INSN_NOTE (EPILOGUE_BEG) | |
67 | ||
68 | /* These note where exception handling regions begin and end. | |
69 | Uses NOTE_EH_HANDLER to identify the region in question. */ | |
70 | INSN_NOTE (EH_REGION_BEG) | |
71 | INSN_NOTE (EH_REGION_END) | |
72 | ||
73 | /* Generated whenever a duplicate line number note is output. | |
74 | For example, one is output after the end of an inline function, | |
75 | in order to prevent the line containing the inline call from | |
76 | being counted twice in gcov. */ | |
77 | INSN_NOTE (REPEATED_LINE_NUMBER) | |
78 | ||
79 | /* The location of a variable. */ | |
80 | INSN_NOTE (VAR_LOCATION) | |
81 | ||
82 | /* Record the expected value of a register at a location. Uses | |
83 | NOTE_EXPECTED_VALUE; stored as (eq (reg) (const_int)). */ | |
84 | INSN_NOTE (EXPECTED_VALUE) | |
85 | ||
86 | /* Record the struct for the following basic block. Uses | |
87 | NOTE_BASIC_BLOCK. FIXME: Redundant with the basic block pointer | |
88 | now included in every insn. */ | |
89 | INSN_NOTE (BASIC_BLOCK) | |
90 | ||
91 | /* Record that the current basic block is unlikely to be executed and | |
92 | should be moved to the UNLIKELY_EXECUTED_TEXT_SECTION. FIXME: Make | |
dac49aa5 | 93 | this a bit on the basic block structure. */ |
30f4db0d | 94 | INSN_NOTE (UNLIKELY_EXECUTED_CODE) |
95 | ||
30f4db0d | 96 | #undef INSN_NOTE |