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/* Hooks for cfg representation specific functions.
Copyright (C) 2003 Free Software Foundation, Inc.
Contributed by Sebastian Pop <>
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 2, 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
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 COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
struct cfg_hooks
/* Debugging. Do not use macros to hook these so they can be called from
debugger! */
int (*cfgh_verify_flow_info) (void);
void (*dump_bb) (basic_block, FILE *);
/* Basic CFG manipulation. */
/* Return new basic block. */
basic_block (*create_basic_block) (void *head, void *end, basic_block after);
/* Redirect edge E to the given basic block B and update underlying program
representation. Returns false when edge is not easily redirectable for
whatever reason. */
bool (*redirect_edge_and_branch) (edge e, basic_block b);
/* Same as the above but allows redirecting of fallthru edges. In that case
newly created forwarder basic block is returned. It aborts when called
on abnormal edge. */
basic_block (*redirect_edge_and_branch_force) (edge, basic_block);
/* Remove given basic block and all edges possibly pointing into it. */
void (*delete_block) (basic_block);
/* Split basic block B after specified instruction I. */
edge (*split_block) (basic_block b, void * i);
/* Return true when blocks A and B can be merged into single basic block. */
bool (*can_merge_blocks_p) (basic_block a, basic_block b);
/* Merge blocks A and B. */
void (*merge_blocks) (basic_block a, basic_block b);
/* Higher level functions representable by primitive operations above if
we didn't have some oddities in RTL and Tree representations. */
basic_block (*cfgh_split_edge) (edge);
#define redirect_edge_and_branch(e,b) cfg_hooks->redirect_edge_and_branch (e,b)
#define redirect_edge_and_branch_force(e,b) cfg_hooks->redirect_edge_and_branch_force (e,b)
#define split_block(e,i) cfg_hooks->split_block (e,i)
#define delete_block(b) cfg_hooks->delete_block (b)
#define split_edge(e) cfg_hooks->cfgh_split_edge (e)
#define create_basic_block(h,e,a) cfg_hooks->create_basic_block (h,e,a)
#define can_merge_blocks_p(a,b) cfg_hooks->can_merge_blocks_p (a,b)
#define merge_blocks(a,b) cfg_hooks->merge_blocks (a,b)
/* Hooks containers. */
extern struct cfg_hooks rtl_cfg_hooks;
/* A pointer to one of the hooks containers. */
extern struct cfg_hooks *cfg_hooks;
/* Declarations. */
extern void rtl_register_cfg_hooks (void);
extern void cfg_layout_rtl_register_cfg_hooks (void);
#endif /* GCC_CFGHOOKS_H */