nsz Git - libfirm/blob - ir/be/bemain.c

   1 /**
   2  * Backend driver.
   3  * @author Sebastian Hack
   4  * @date 25.11.2004
   5  */
   6 #ifdef HAVE_CONFIG_H
   7 #include "config.h"
   8 #endif
   9
  10 #include <stdarg.h>
  11
  12 #include "obst.h"
  13 #include "bitset.h"
  14
  15 #include "irprog.h"
  16 #include "irgopt.h"
  17 #include "irgraph.h"
  18 #include "irdump.h"
  19 #include "phiclass.h"
  20 #include "irdom_t.h"
  21 #include "iredges_t.h"
  22 #include "irloop_t.h"
  23
  24 #include "be_t.h"
  25 #include "beifg.h"
  26 #include "bechordal_t.h"
  27 #include "benumb_t.h"
  28 #include "besched_t.h"
  29 #include "belistsched.h"
  30 #include "belive_t.h"
  31 #include "beutil.h"
  32 #include "bechordal.h"
  33 #include "bearch.h"
  34 #include "becopyoptmain.h"
  35 #include "becopystat.h"
  36 #include "bessadestr.h"
  37 #include "bearch_firm.h"
  38 #include "benode_t.h"
  39 #include "beirgmod.h"
  40 #include "bespillilp.h"
  41 #include "bespillbelady.h"
  42
  43 #include "beasm_dump_globals.h"
  44 #include "beasm_asm_gnu.h"
  45
  46 #include "firm2arch.h"
  47
  48 #undef DUMP_BEGIN
  49 #undef DUMP_PREPARED
  50 #define DUMP_TRANSFORM
  51 #define DUMP_SCHED
  52 #define DUMP_SPILL
  53 #undef DUMP_ALLOCATED
  54 #undef DUMP_COPYMIN
  55 #undef DUMP_SSADESTR
  56 #undef DUMP_END
  57
  58 #undef DO_SSADESTR
  59
  60 #define N_PHASES 256
  61
  62 void be_init(void)
  63 {
  64         be_sched_init();
  65         be_liveness_init();
  66         be_numbering_init();
  67         be_ra_chordal_init();
  68         be_copy_opt_init();
  69         copystat_init();
  70         phi_class_init();
  71 }
  72
  73 static be_main_env_t *be_init_env(be_main_env_t *env)
  74 {
  75   const arch_isa_if_t *isa = &firm_isa;
  76
  77   obstack_init(&env->obst);
  78   env->dbg = firm_dbg_register("be.main");
  79   firm_dbg_set_mask(env->dbg, SET_LEVEL_1);
  80
  81   env->arch_env = obstack_alloc(&env->obst, sizeof(env->arch_env[0]));
  82   arch_env_init(env->arch_env, isa);
  83   env->arch_env->isa->init();
  84
  85   env->node_factory = obstack_alloc(&env->obst, sizeof(*env->node_factory));
  86   be_node_factory_init(env->node_factory, isa);
  87
  88   /* Register the irn handler of the architecture */
  89   if (isa->irn_handler)
  90                 arch_env_add_irn_handler(env->arch_env, isa->irn_handler);
  91
  92   /*
  93    * Register the node handler of the back end infrastructure.
  94    * This irn handler takes care of the platform independent
  95    * spill, reload and perm nodes.
  96    */
  97   arch_env_add_irn_handler(env->arch_env, be_node_get_irn_handler(env->node_factory));
  98
  99   return env;
 100 }
 101
 102 static be_main_session_env_t *
 103 be_init_session_env(be_main_session_env_t *env,
 104     be_main_env_t *main_env, ir_graph *irg)
 105 {
 106   env->main_env = main_env;
 107   env->irg = irg;
 108
 109   return env;
 110 }
 111
 112 static void prepare_graph(be_main_session_env_t *s)
 113 {
 114         /* set the current graph (this is important for several firm functions) */
 115         current_ir_graph = s->irg;
 116
 117         /* Let the isa prepare the graph. */
 118         s->main_env->arch_env->isa->prepare_graph(s->irg);
 119
 120         /* Normalize proj nodes. */
 121         normalize_proj_nodes(s->irg);
 122
 123         /* Remove critical edges */
 124         remove_critical_cf_edges(s->irg);
 125
 126         /* Compute the dominance information. */
 127         free_dom_and_peace(s->irg);
 128         compute_doms(s->irg);
 129
 130         /* Compute the dominance frontiers */
 131         s->dom_front = be_compute_dominance_frontiers(s->irg);
 132
 133         /* Ensure, that the ir_edges are computed. */
 134         edges_activate(s->irg);
 135
 136         /* Compute loop nesting information (for weighting copies) */
 137         if (get_irg_loopinfo_state(s->irg) != (loopinfo_valid & loopinfo_cf_consistent))
 138                 construct_cf_backedges(s->irg);
 139
 140         be_check_dominance(s->irg);
 141 }
 142
 143 static void be_main_loop(void)
 144 {
 145         int i, j, m, n;
 146         be_main_env_t env;
 147         const arch_isa_if_t *isa;
 148
 149         be_init_env(&env);
 150         isa = arch_env_get_isa(env.arch_env);
 151
 152         /* create required irop's */
 153         create_bearch_asm_opcodes();
 154
 155         /* For all graphs */
 156         for(i = 0, n = get_irp_n_irgs(); i < n; ++i) {
 157                 ir_graph *irg = get_irp_irg(i);
 158                 be_main_session_env_t session;
 159
 160                 DBG((env.dbg, LEVEL_2, "====> IRG: %F\n", irg));
 161 #ifdef DUMP_BEGIN
 162                 dump_ir_block_graph(irg, "-begin");
 163 #endif
 164
 165                 /* Init the session. */
 166                 be_init_session_env(&session, &env, irg);
 167
 168                 /* Compute some analyses and prepare the graph for backend use. */
 169                 prepare_graph(&session);
 170
 171                 transform_firm(irg);
 172
 173 #ifdef DUMP_TRANSFORM
 174                 dump_ir_block_graph(irg, "-transformed");
 175 #endif
 176
 177
 178 #ifdef DUMP_PREPARED
 179                 dump_dominator_information(true);
 180                 dump_ir_block_graph(irg, "-prepared");
 181                 dump_dominator_information(false);
 182 #endif
 183
 184                 /* Schedule the graphs. */
 185                 list_sched(irg, trivial_selector);
 186                 be_sched_imm(irg);
 187
 188 #ifdef DUMP_SCHED
 189                 dump_ir_block_graph_sched(irg, "-sched");
 190 #endif
 191
 192                 /* Verify the schedule */
 193                 sched_verify_irg(irg);
 194
 195                 /* Build liveness information */
 196                 be_liveness(irg);
 197
 198                 /* Perform the following for each register class. */
 199                 for(j = 0, m = isa->get_n_reg_class(); j < m; ++j) {
 200                         be_chordal_env_t *chordal_env;
 201                         be_ifg_t *ifg;
 202
 203                         const arch_register_class_t *cls = isa->get_reg_class(j);
 204                         DBG((env.dbg, LEVEL_1, "----> Reg class: %s\n", cls->name));
 205
 206                         /* spilling */
 207                         //be_spill_ilp(&session, cls);
 208                         be_spill_belady(&session, cls);
 209 #ifdef DUMP_SPILL
 210                         dump_ir_block_graph_sched(session.irg, "-spill");
 211 #endif
 212                         be_liveness(irg);
 213                         be_numbering(irg);
 214                         be_check_pressure(&session, cls);
 215
 216                         /* allocation */
 217                         chordal_env = be_ra_chordal(&session, cls);
 218 #ifdef DUMP_ALLOCATED
 219                         dump_allocated_irg(env.arch_env, irg, "");
 220 #endif
 221
 222                         /* Build the interference graph. */
 223                         ifg = be_ifg_std_new(chordal_env);
 224
 225 #ifdef DO_SSADESTR
 226                         /* copy minimization */
 227                         copystat_collect_cls(chordal_env);
 228                         be_copy_opt(chordal_env);
 229 #ifdef DUMP_COPYMIN
 230                         dump_allocated_irg(env.arch_env, irg, "-copymin");
 231 #endif
 232
 233                         /* ssa destruction */
 234                         be_ssa_destruction(chordal_env);
 235                         be_ssa_destruction_check(chordal_env);
 236                         be_ra_chordal_check(chordal_env);
 237 #ifdef DUMP_SSADESTR
 238                         dump_allocated_irg(env.arch_env, irg, "-ssadestr");
 239 #endif
 240 #endif
 241
 242                         be_ifg_free(ifg);
 243                         be_ra_chordal_done(chordal_env);
 244                         be_numbering_done(irg);
 245                 }
 246 #ifdef DUMP_END
 247                 dump_ir_block_graph_sched(session.irg, "-end");
 248 #endif
 249                 copystat_dump(irg);
 250         }
 251 }
 252
 253 void be_main(int argc, const char *argv[])
 254 {
 255   FILE *asm_output_file;
 256
 257   be_main_loop();
 258
 259   asm_output_file = fopen(argv[0], "w");
 260   firmbe_gen_code(asm_output_file);
 261   fclose(asm_output_file);
 262 }