96 lines
2.9 KiB
C
96 lines
2.9 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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struct dstring_s;
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struct flownode_s;
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struct sblock_s;
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typedef struct daglabel_s {
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/// \name attached identifer linked list
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//@{
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struct daglabel_s *next;
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struct daglabel_s **prev;
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//@}
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struct daglabel_s *daglabel_chain; ///< all labels created for a dag
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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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} daglabel_t;
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typedef struct dagnode_s {
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struct dagnode_s *next;
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int print_count; ///< used to avoid double printing nodes
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int is_child; ///< true if a child node
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int cost; ///< cost of this node in temp vars
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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 statement_s *statement; ///< statement generating this node
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/// \name child nodes
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/// All three child nodes will be null if this node is a leaf
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/// If \a a is null, both \a b and \a c must also be null. If \a is not
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/// null, either \a b or \a c or even both may be non-null. Both \a b and
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/// \a c being non-null is reserved for the few opcodes that take three
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/// inputs (rcall2+, 3 op state, indirect move, indexed pointer assignment)
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/// \a b and \a c are used to help keep track of the original statement
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/// operands
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//@{
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struct dagnode_s *a, *b, *c;
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etype_t ta, tb, tc; ///< desired type of each operand (to alias)
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//@}
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daglabel_t *identifiers; ///< list of identifiers with value of this node
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} dagnode_t;
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const char *daglabel_string (daglabel_t *label);
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void print_dag (struct dstring_s *dstr, dagnode_t *node);
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/** Make a dag for a single basic block.
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\param node 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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dagnode_t *dag_create (const struct flownode_s *flownode);
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void dag_generate (struct sblock_s *block, const struct flownode_s *flownode);
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//@}
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#endif//dags_h
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