nsz Git - libfirm/blob - ir/ana/phiclass.c

   1 /**
   2  * @author Daniel Grund
   3  * @date 09.08.2005
   4  */
   5 #ifdef HAVE_CONFIG_H
   6 # include "config.h"
   7 #endif
   8
   9 #ifdef HAVE_STDLIB_H
  10 # include <stdlib.h>
  11 #endif
  12
  13 #include "debug.h"
  14 #include "irgwalk.h"
  15 #include "irop_t.h"
  16 #include "iredges_t.h"
  17 #include "phiclass_t.h"
  18
  19 #define DEBUG_LVL SET_LEVEL_0
  20 static firm_dbg_module_t *dbg = NULL;
  21
  22 size_t phi_irn_data_offset = 0;
  23
  24 static void phi_class_build(ir_node *irn, pset *pc) {
  25         int i, max;
  26         const ir_edge_t *edge;
  27
  28         /* If irn has a phi class assigned already
  29          * return immediately to stop recursion */
  30         if (_get_phi_class(irn)) {
  31                 DBG((dbg, LEVEL_2, "  already done for %+F\n", irn));
  32                 return;
  33         }
  34
  35         /* The initial call to phi_class_build doesn't
  36          * provide a pset, so alloc it */
  37         if (!pc) {
  38                 DBG((dbg, LEVEL_1, "Computing phi class for %+F\n", irn));
  39                 assert(is_Phi(irn));
  40                 pc = pset_new_ptr(4);
  41         }
  42
  43         /* Add the irn to the phi class */
  44         DBG((dbg, LEVEL_1, "  adding %+F\n", irn));
  45         pset_insert_ptr(pc, irn);
  46         _set_phi_class(irn, pc);
  47
  48         /* Check the 'neighbour' irns */
  49         if (is_Phi(irn) && mode_is_datab(get_irn_mode(irn))) {
  50                 /* Add all args of the phi to the phi-class. */
  51                  for (i=0, max=get_irn_arity(irn); i<max; ++i) {
  52                         DBG((dbg, LEVEL_2, "  checking arg %+F\n", get_irn_n(irn, i)));
  53                         phi_class_build(get_irn_n(irn, i), pc);
  54                  }
  55         }
  56
  57         /* Add a user of the irn to the class,
  58          * iff it is a phi node  */
  59         foreach_out_edge(irn, edge) {
  60                 ir_node *user = edge->src;
  61                 DBG((dbg, LEVEL_2, "  checking user %+F\n", user));
  62                 if (is_Phi(user) && mode_is_datab(get_irn_mode(user)))
  63                         phi_class_build(user, pc);
  64         }
  65 }
  66
  67 static void phi_class_construction_walker(ir_node *node, void *env) {
  68         if (is_Phi(node) && mode_is_datab(get_irn_mode(node)))
  69                 phi_class_build(node, NULL);
  70 }
  71
  72 static void phi_class_destruction_walker(ir_node *node, void *env) {
  73         pset *clss = _get_phi_class(node);
  74         if (clss) {
  75                 ir_node *n;
  76                 for(n = pset_first(clss); n; n = pset_next(clss))
  77                         _set_phi_class(n, NULL);
  78                 del_pset(clss);
  79         }
  80 }
  81
  82 void phi_class_compute(ir_graph *irg) {
  83         irg_walk_graph(irg, phi_class_destruction_walker, NULL, NULL);
  84         irg_walk_graph(irg, phi_class_construction_walker, NULL, NULL);
  85 }
  86
  87 pset *phi_class_compute_by_phis(pset *all_phi_nodes) {
  88         int i;
  89         ir_node *phi;
  90         pset *all_phi_classes = pset_new_ptr_default();
  91
  92         if (pset_count(all_phi_nodes)) {
  93                 ir_graph *irg = get_irn_irg(pset_first(all_phi_nodes));
  94                 pset_break(all_phi_nodes);
  95                 irg_walk_graph(irg, phi_class_destruction_walker, NULL, NULL);
  96
  97                 for (i = 0, phi=pset_first(all_phi_nodes); phi; phi=pset_next(all_phi_nodes)) {
  98                         assert(is_Phi(phi) && mode_is_datab(get_irn_mode(phi)));
  99                         phi_class_build(phi, NULL);
 100                         pset_insert_ptr(all_phi_classes, _get_phi_class(phi));
 101                 }
 102         }
 103
 104         return all_phi_classes;
 105 }
 106
 107 void phi_class_free(ir_graph *irg) {
 108         irg_walk_graph(irg, phi_class_destruction_walker, NULL, NULL);
 109 }
 110
 111 pset *get_phi_class(const ir_node *irn) {
 112         return get_irn_phi_info(irn)->phi_class;
 113 }
 114
 115 void phi_class_init(void) {
 116         dbg = firm_dbg_register("ir.ana.phiclass");
 117         firm_dbg_set_mask(dbg, DEBUG_LVL);
 118         phi_irn_data_offset = register_additional_node_data(sizeof(phi_info_t));
 119 }