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

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