1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
/* Control flow graph manipulation code header file.
Copyright (C) 2014-2020 Free Software Foundation, Inc.
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_CFG_H
#define GCC_CFG_H
#include "dominance.h"
/* What sort of profiling information we have. */
enum profile_status_d
{
PROFILE_ABSENT,
PROFILE_GUESSED,
PROFILE_READ,
PROFILE_LAST /* Last value, used by profile streaming. */
};
/* A structure to group all the per-function control flow graph data.
The x_* prefixing is necessary because otherwise references to the
fields of this struct are interpreted as the defines for backward
source compatibility following the definition of this struct. */
struct GTY(()) control_flow_graph {
/* Block pointers for the exit and entry of a function.
These are always the head and tail of the basic block list. */
basic_block x_entry_block_ptr;
basic_block x_exit_block_ptr;
/* Index by basic block number, get basic block struct info. */
vec<basic_block, va_gc> *x_basic_block_info;
/* Number of basic blocks in this flow graph. */
int x_n_basic_blocks;
/* Number of edges in this flow graph. */
int x_n_edges;
/* The first free basic block number. */
int x_last_basic_block;
/* UIDs for LABEL_DECLs. */
int last_label_uid;
/* Mapping of labels to their associated blocks. At present
only used for the gimple CFG. */
vec<basic_block, va_gc> *x_label_to_block_map;
enum profile_status_d x_profile_status;
/* Whether the dominators and the postdominators are available. */
enum dom_state x_dom_computed[2];
/* Number of basic blocks in the dominance tree. */
unsigned x_n_bbs_in_dom_tree[2];
/* Maximal number of entities in the single jumptable. Used to estimate
final flowgraph size. */
int max_jumptable_ents;
/* Maximal count of BB in function. */
profile_count count_max;
/* Dynamically allocated edge/bb flags. */
int edge_flags_allocated;
int bb_flags_allocated;
};
extern void init_flow (function *);
extern void clear_edges (function *);
extern basic_block alloc_block (void);
extern void link_block (basic_block, basic_block);
extern void unlink_block (basic_block);
extern void compact_blocks (void);
extern void expunge_block (basic_block);
extern edge unchecked_make_edge (basic_block, basic_block, int);
extern edge cached_make_edge (sbitmap, basic_block, basic_block, int);
extern edge make_edge (basic_block, basic_block, int);
extern edge make_single_succ_edge (basic_block, basic_block, int);
extern void remove_edge_raw (edge);
extern void redirect_edge_succ (edge, basic_block);
extern void redirect_edge_pred (edge, basic_block);
extern void clear_bb_flags (void);
extern void dump_edge_info (FILE *, edge, dump_flags_t, int);
extern void debug (edge_def &ref);
extern void debug (edge_def *ptr);
extern void alloc_aux_for_blocks (int);
extern void clear_aux_for_blocks (void);
extern void free_aux_for_blocks (void);
extern void alloc_aux_for_edge (edge, int);
extern void alloc_aux_for_edges (int);
extern void clear_aux_for_edges (void);
extern void free_aux_for_edges (void);
extern void debug_bb (basic_block);
extern basic_block debug_bb_n (int);
extern void dump_bb_info (FILE *, basic_block, int, dump_flags_t, bool, bool);
extern void brief_dump_cfg (FILE *, dump_flags_t);
extern void update_bb_profile_for_threading (basic_block, profile_count, edge);
extern void scale_bbs_frequencies_profile_count (basic_block *, int,
profile_count, profile_count);
extern void scale_bbs_frequencies (basic_block *, int, profile_probability);
extern void initialize_original_copy_tables (void);
extern void reset_original_copy_tables (void);
extern void free_original_copy_tables (void);
extern bool original_copy_tables_initialized_p (void);
extern void set_bb_original (basic_block, basic_block);
extern basic_block get_bb_original (basic_block);
extern void set_bb_copy (basic_block, basic_block);
extern basic_block get_bb_copy (basic_block);
void set_loop_copy (class loop *, class loop *);
class loop *get_loop_copy (class loop *);
/* Generic RAII class to allocate a bit from storage of integer type T.
The allocated bit is accessible as mask with the single bit set
via the conversion operator to T. */
template <class T>
class auto_flag
{
public:
/* static assert T is integer type of max HOST_WIDE_INT precision. */
auto_flag (T *sptr)
{
m_sptr = sptr;
int free_bit = ffs_hwi (~*sptr);
/* If there are no unset bits... */
if (free_bit == 0)
gcc_unreachable ();
m_flag = HOST_WIDE_INT_1U << (free_bit - 1);
/* ...or if T is signed and thus the complement is sign-extended,
check if we ran out of bits. We could spare us this bit
if we could use C++11 std::make_unsigned<T>::type to pass
~*sptr to ffs_hwi. */
if (m_flag == 0)
gcc_unreachable ();
gcc_checking_assert ((*sptr & m_flag) == 0);
*sptr |= m_flag;
}
~auto_flag ()
{
gcc_checking_assert ((*m_sptr & m_flag) == m_flag);
*m_sptr &= ~m_flag;
}
operator T () const { return m_flag; }
private:
T *m_sptr;
T m_flag;
};
/* RAII class to allocate an edge flag for temporary use. You have
to clear the flag from all edges when you are finished using it. */
class auto_edge_flag : public auto_flag<int>
{
public:
auto_edge_flag (function *fun)
: auto_flag<int> (&fun->cfg->edge_flags_allocated) {}
};
/* RAII class to allocate a bb flag for temporary use. You have
to clear the flag from all edges when you are finished using it. */
class auto_bb_flag : public auto_flag<int>
{
public:
auto_bb_flag (function *fun)
: auto_flag<int> (&fun->cfg->bb_flags_allocated) {}
};
#endif /* GCC_CFG_H */
|
