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/* Control flow graph manipulation code header file.
Copyright (C) 2014-2023 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 free_cfg (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 debug_bb (basic_block, dump_flags_t);
extern basic_block debug_bb_n (int, dump_flags_t);
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 */
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