113 lines
4.4 KiB
C
113 lines
4.4 KiB
C
/* Generic dominator tree walker
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Copyright (C) 2003, 2004 Free Software Foundation, Inc.
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Contributed by Diego Novillo <dnovillo@redhat.com>
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* This is the main data structure for the dominator walker. It provides
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the callback hooks as well as a convenient place to hang block local
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data and pass-global data. */
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struct dom_walk_data
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{
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/* This is the direction of the dominator tree we want to walk. ie,
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if it is set to CDI_DOMINATORS, then we walk the dominator tree,
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if it is set to CDI_POST_DOMINATORS, then we walk the post
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dominator tree. */
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ENUM_BITFIELD (cdi_direction) dom_direction : 2;
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/* Nonzero if the statement walker should walk the statements from
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last to first within a basic block instead of first to last.
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Note this affects both statement walkers. We haven't yet needed
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to use the second statement walker for anything, so it's hard to
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predict if we really need the ability to select their direction
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independently. */
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bool walk_stmts_backward : 1;
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/* Function to initialize block local data.
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Note that the dominator walker infrastructure may provide a new
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fresh, and zero'd block local data structure, or it may re-use an
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existing block local data structure.
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If the block local structure has items such as virtual arrays, then
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that allows your optimizer to re-use those arrays rather than
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creating new ones. */
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void (*initialize_block_local_data) (struct dom_walk_data *,
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basic_block, bool);
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/* Function to call before the statement walk occurring before the
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recursive walk of the dominator children.
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This typically initializes an block local data and pushes that
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data onto BLOCK_DATA_STACK. */
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void (*before_dom_children_before_stmts) (struct dom_walk_data *,
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basic_block);
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/* Function to call to walk statements before the recursive walk
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of the dominator children. */
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void (*before_dom_children_walk_stmts) (struct dom_walk_data *,
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basic_block, block_stmt_iterator);
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/* Function to call after the statement walk occurring before the
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recursive walk of the dominator children. */
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void (*before_dom_children_after_stmts) (struct dom_walk_data *,
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basic_block);
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/* Function to call before the statement walk occurring after the
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recursive walk of the dominator children. */
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void (*after_dom_children_before_stmts) (struct dom_walk_data *,
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basic_block);
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/* Function to call to walk statements after the recursive walk
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of the dominator children. */
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void (*after_dom_children_walk_stmts) (struct dom_walk_data *,
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basic_block, block_stmt_iterator);
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/* Function to call after the statement walk occurring after the
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recursive walk of the dominator children.
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This typically finalizes any block local data and pops
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that data from BLOCK_DATA_STACK. */
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void (*after_dom_children_after_stmts) (struct dom_walk_data *,
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basic_block);
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/* Global data for a walk through the dominator tree. */
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void *global_data;
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/* Stack of any data we need to keep on a per-block basis.
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If you have no local data, then BLOCK_DATA_STACK will be NULL. */
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varray_type block_data_stack;
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/* Size of the block local data. If this is zero, then it is assumed
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you have no local data and thus no BLOCK_DATA_STACK as well. */
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size_t block_local_data_size;
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/* From here below are private data. Please do not use this
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information/data outside domwalk.c. */
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/* Stack of available block local structures. */
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varray_type free_block_data;
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};
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void walk_dominator_tree (struct dom_walk_data *, basic_block);
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void init_walk_dominator_tree (struct dom_walk_data *);
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void fini_walk_dominator_tree (struct dom_walk_data *);
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