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Dead nodes are those that generate unused values (unassigned leaf nodes, expressions or destinationless move(p) nodes). The revoval is done by the flow analysis code (via the dags code) so that any pre and post removal flow analysis and manipulation may be done (eg, available expressions).
115 lines
3.8 KiB
C
115 lines
3.8 KiB
C
/*
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dags.h
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DAG representation of basic blocks
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Copyright (C) 2012 Bill Currie <bill@taniwha.org>
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Author: Bill Currie <bill@taniwha.org>
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Date: 2012/05/08
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program 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.
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See the 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 this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifndef dags_h
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#define dags_h
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/** \defgroup qfcc_dags DAG building
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\ingroup qfcc
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*/
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//@{
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#include "QF/pr_comp.h"
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#include "statements.h"
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struct dstring_s;
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struct flownode_s;
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typedef struct daglabel_s {
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struct daglabel_s *next;
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struct daglabel_s *daglabel_chain; ///< all labels created for a dag
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int number; ///< index into array of labels in dag_t
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unsigned live:1; ///< accessed via an alias
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const char *opcode; ///< not if op
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struct operand_s *op; ///< not if opcode;
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struct dagnode_s *dagnode; ///< node with which this label is associated
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struct expr_s *expr; ///< expression associated with this label
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} daglabel_t;
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typedef struct dagnode_s {
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struct dagnode_s *next;
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int number; ///< index into array of nodes in dag_t
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int topo; ///< topological sort order
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struct set_s *parents; ///< empty if root node
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int cost; ///< cost of this node in temp vars
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unsigned killed:1; ///< node is unavailable for cse
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st_type_t type; ///< type of node (st_node = leaf)
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daglabel_t *label; ///< ident/const if leaf node, or operator
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etype_t tl;
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struct operand_s *value; ///< operand holding the value of this node
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/// \name child nodes
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/// if \a children[0] is null, the rest must be null as well. Similar for
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/// \a children[1].
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///
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/// \a edges is the set of all nodes upon which this node depends. ie,
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/// they must be evaluated before this node is evaluted. So while nodes
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/// in \a edges may not be true children of this node, they are effective
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/// children in the DAG. That is, \a edges is for producing a correct
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/// topological sort of the DAG.
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//@{
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struct dagnode_s *children[3];
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etype_t types[3]; ///< desired type of each operand (to alias)
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struct set_s *edges; ///< includes nodes pointed to by \a children
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//@}
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struct set_s *identifiers; ///< set of identifiers attached to this node
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} dagnode_t;
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typedef struct dag_s {
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struct dag_s *next;
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dagnode_t **nodes; ///< array of all dagnodes in this dag
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int num_nodes;
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int *topo; ///< nodes in topological sort order
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int num_topo; ///< number of nodes in topo (may be <
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///< num_nodes after dead node removal)
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daglabel_t **labels; ///< array of all daglabels in this dag
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int num_labels;;
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struct set_s *roots; ///< set of root nodes
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struct flownode_s *flownode;///< flow node this dag represents
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} dag_t;
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const char *daglabel_string (daglabel_t *label);
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void print_dag (struct dstring_s *dstr, dag_t *dag, const char *label);
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void dot_dump_dag (void *_dag, const char *filename);
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/** Make a dag for a single basic block.
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\param flownode The flow graph node representing the basic block for which
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the dag will be created. The node should have its live
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variable information already computed.
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\return The dag representing the basic block.
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*/
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dag_t *dag_create (struct flownode_s *flownode);
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void dag_remove_dead_nodes (dag_t *dag);
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void dag_generate (dag_t *dag, sblock_t *block);
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//@}
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#endif//dags_h
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