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https://git.code.sf.net/p/quake/quakeforge
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12133bc02f
While things are quite broken now (very incorrect code is being generated), the dag is much easier to work with. The dag is now stored in an array of nodes (the children pointers are still used for dagnode operands), and sets are used for marking node parents, attached identifiers and (when done, extra edges).
114 lines
3.5 KiB
C
114 lines
3.5 KiB
C
/*
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flow.h
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Flow graph analysis.
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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: 2012/10/30
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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 flow_h
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#define flow_h
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/** \defgroup qfcc_flow Flow graph analysis
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\ingroup qfcc
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*/
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//@{
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struct function_s;
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struct sblock_s;
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struct statement_s;
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struct operand_s;
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typedef struct flowvar_s {
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struct flowvar_s *next; ///< for ALLOC
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struct set_s *use; ///< set of statements that use this var
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struct set_s *define; ///< set of statements that define this var
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struct operand_s *op; ///< an operand using this var
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int number; ///< number of variable in func's ref list
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} flowvar_t;
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typedef struct flowloop_s {
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struct flowloop_s *next;
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unsigned head;
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struct set_s *nodes;
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} flowloop_t;
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typedef struct flowedge_s {
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unsigned tail;
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unsigned head;
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} flowedge_t;
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/** Represent a node in a flow graph.
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*/
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typedef struct flownode_s {
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struct flownode_s *next; ///< for ALLOC
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unsigned id; ///< index of this node in the flow graph
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unsigned dfn; ///< depth-first ordering of this node
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struct set_s *predecessors; ///< predecessors of this node
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struct set_s *successors; ///< successors of this node
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struct set_s *edges; ///< edges leaving this node to successor nodes
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struct set_s *dom; ///< dominating nodes
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struct {
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struct set_s *use;
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struct set_s *def;
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struct set_s *in;
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struct set_s *out;
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} live_vars;
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struct sblock_s *sblock; ///< original statement block
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struct dag_s *dag; ///< dag for this node
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} flownode_t;
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typedef struct flowgraph_s {
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struct flowgraph_s *next; ///< for ALLOC
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struct function_s *func; ///< function to which this graph is attached
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flownode_t **nodes; ///< array of nodes in the graph
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int num_nodes;
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flowedge_t *edges; ///< array of all edges in the graph
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int num_edges;
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struct set_s *dfst; ///< edges in the depth-first search tree
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unsigned *dfo; ///< depth-first order of nodes
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flowloop_t *loops; ///< linked list of natural loops
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} flowgraph_t;
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flowvar_t *flow_get_var (struct operand_s *op);
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int flow_is_cond (struct statement_s *s);
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int flow_is_goto (struct statement_s *s);
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int flow_is_jumpb (struct statement_s *s);
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int flow_is_return (struct statement_s *s);
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struct sblock_s *flow_get_target (struct statement_s *s);
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struct sblock_s **flow_get_targetlist (struct statement_s *s);
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void flow_analyze_statement (struct statement_s *s, struct set_s *use,
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struct set_s *def, struct set_s *kill,
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struct operand_s *operands[4]);
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void flow_build_vars (struct function_s *func);
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flowgraph_t *flow_build_graph (struct sblock_s *func);
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void flow_del_graph (flowgraph_t *graph);
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void flow_data_flow (flowgraph_t *graph);
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struct sblock_s *flow_generate (flowgraph_t *graph);
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void print_flowgraph (flowgraph_t *graph, const char *filename);
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//@}
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#endif//flow_h
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