| /* Control flow graph manipulation code header file. |
| Copyright (C) 2014-2019 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 (struct loop *, struct loop *); |
| struct loop *get_loop_copy (struct 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 */ |