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 "bechordal_t.h"
  26 #include "benumb_t.h"
  27 #include "besched_t.h"
  28 #include "belistsched.h"
  29 #include "belive_t.h"
  30 #include "beutil.h"
  31 #include "bechordal.h"
  32 #include "bearch.h"
  33 #include "becopyoptmain.h"
  34 #include "becopystat.h"
  35 #include "bessadestr.h"
  36 #include "bearch_firm.h"
  37 #include "benode_t.h"
  38 #include "beirgmod.h"
  39 #include "bespillilp.h"
  40 #include "bespillbelady.h"
  41
  42 #include "beasm_dump_globals.h"
  43 #include "beasm_asm_gnu.h"
  44
  45 #include "firm2arch.h"
  46
  47 #undef DUMP_BEGIN
  48 #undef DUMP_PREPARED
  49 #define DUMP_TRANSFORM
  50 #define DUMP_SCHED
  51 #define DUMP_SPILL
  52 #undef DUMP_ALLOCATED
  53 #undef DUMP_COPYMIN
  54 #undef DUMP_SSADESTR
  55 #undef DUMP_END
  56
  57 #define N_PHASES 256
  58
  59 void be_init(void)
  60 {
  61         be_sched_init();
  62         be_liveness_init();
  63         be_numbering_init();
  64         be_ra_chordal_init();
  65         be_copy_opt_init();
  66         copystat_init();
  67         phi_class_init();
  68 }
  69
  70 static be_main_env_t *be_init_env(be_main_env_t *env)
  71 {
  72   const arch_isa_if_t *isa = &firm_isa;
  73
  74   obstack_init(&env->obst);
  75   env->dbg = firm_dbg_register("be.main");
  76   firm_dbg_set_mask(env->dbg, SET_LEVEL_1);
  77
  78   env->arch_env = obstack_alloc(&env->obst, sizeof(env->arch_env[0]));
  79   arch_env_init(env->arch_env, isa);
  80   env->arch_env->isa->init();
  81
  82   env->node_factory = obstack_alloc(&env->obst, sizeof(*env->node_factory));
  83   be_node_factory_init(env->node_factory, isa);
  84
  85   /* Register the irn handler of the architecture */
  86   if (isa->irn_handler)
  87                 arch_env_add_irn_handler(env->arch_env, isa->irn_handler);
  88
  89   /*
  90    * Register the node handler of the back end infrastructure.
  91    * This irn handler takes care of the platform independent
  92    * spill, reload and perm nodes.
  93    */
  94   arch_env_add_irn_handler(env->arch_env, be_node_get_irn_handler(env->node_factory));
  95
  96   return env;
  97 }
  98
  99 static be_main_session_env_t *
 100 be_init_session_env(be_main_session_env_t *env,
 101     be_main_env_t *main_env, ir_graph *irg)
 102 {
 103   env->main_env = main_env;
 104   env->irg = irg;
 105
 106   return env;
 107 }
 108
 109 static void prepare_graph(be_main_session_env_t *s)
 110 {
 111         /* set the current graph (this is important for several firm functions) */
 112         current_ir_graph = s->irg;
 113
 114         /* Let the isa prepare the graph. */
 115         s->main_env->arch_env->isa->prepare_graph(s->irg);
 116
 117         /* Normalize proj nodes. */
 118         normalize_proj_nodes(s->irg);
 119
 120         /* Remove critical edges */
 121         remove_critical_cf_edges(s->irg);
 122
 123         /* Compute the dominance information. */
 124         free_dom_and_peace(s->irg);
 125         compute_doms(s->irg);
 126
 127         /* Compute the dominance frontiers */
 128         s->dom_front = be_compute_dominance_frontiers(s->irg);
 129
 130         /* Ensure, that the ir_edges are computed. */
 131         edges_activate(s->irg);
 132
 133         /* Compute loop nesting information (for weighting copies) */
 134         if (get_irg_loopinfo_state(s->irg) != (loopinfo_valid & loopinfo_cf_consistent))
 135                 construct_cf_backedges(s->irg);
 136
 137         be_check_dominance(s->irg);
 138 }
 139
 140 static void be_main_loop(void)
 141 {
 142         int i, n;
 143         be_main_env_t env;
 144         const arch_isa_if_t *isa;
 145
 146         be_init_env(&env);
 147         isa = arch_env_get_isa(env.arch_env);
 148
 149         /* create required irop's */
 150         create_bearch_asm_opcodes();
 151
 152         /* For all graphs */
 153         for(i = 0, n = get_irp_n_irgs(); i < n; ++i) {
 154                 ir_graph *irg = get_irp_irg(i);
 155                 be_main_session_env_t session;
 156
 157                 DBG((env.dbg, LEVEL_2, "====> IRG: %F\n", irg));
 158 #ifdef DUMP_BEGIN
 159                 dump_ir_block_graph(irg, "-begin");
 160 #endif
 161
 162                 /* Init the session. */
 163                 be_init_session_env(&session, &env, irg);
 164
 165                 /* Compute some analyses and prepare the graph for backend use. */
 166                 prepare_graph(&session);
 167
 168                 transform_firm(irg);
 169
 170 #ifdef DUMP_TRANSFORM
 171                 dump_ir_block_graph(irg, "-transformed");
 172 #endif
 173
 174
 175 #if 0
 176 #ifdef DUMP_PREPARED
 177                 dump_dominator_information(true);
 178                 dump_ir_block_graph(irg, "-prepared");
 179                 dump_dominator_information(false);
 180 #endif
 181
 182                 /* Schedule the graphs. */
 183                 list_sched(irg, trivial_selector);
 184                 be_sched_imm(irg);
 185
 186 #ifdef DUMP_SCHED
 187                 dump_ir_block_graph_sched(irg, "-sched");
 188 #endif
 189
 190                 /* Verify the schedule */
 191                 sched_verify_irg(irg);
 192
 193                 /* Build liveness information */
 194                 be_liveness(irg);
 195
 196                 /* Perform the following for each register class. */
 197                 for(j = 0, m = isa->get_n_reg_class(); j < m; ++j) {
 198                         be_chordal_env_t *chordal_env;
 199                         const arch_register_class_t *cls = isa->get_reg_class(j);
 200                         DBG((env.dbg, LEVEL_1, "----> Reg class: %s\n", cls->name));
 201
 202                         /* spilling */
 203                         //be_spill_ilp(&session, cls);
 204                         be_spill_belady(&session, cls);
 205 #ifdef DUMP_SPILL
 206                         dump_ir_block_graph_sched(session.irg, "-spill");
 207 #endif
 208                         be_liveness(irg);
 209                         be_numbering(irg);
 210                         be_check_pressure(&session, cls);
 211
 212 #if 0
 213                         {
 214                                 FILE *f;
 215                                 char buf[128];
 216                                 ir_snprintf(buf, sizeof(buf), "%F_%s-live.txt", irg, cls->name);
 217                                 if((f = fopen(buf, "wt")) != NULL) {
 218                                         be_liveness_dump(session.irg, f);
 219                                         fclose(f);
 220                                 }
 221                         }
 222 #endif
 223
 224                         /* allocation */
 225                         chordal_env = be_ra_chordal(&session, cls);
 226 #ifdef DUMP_ALLOCATED
 227                         dump_allocated_irg(env.arch_env, irg, "");
 228 #endif
 229
 230                         /* copy minimization */
 231                         copystat_collect_cls(chordal_env);
 232                         be_copy_opt(chordal_env);
 233 #ifdef DUMP_COPYMIN
 234                         dump_allocated_irg(env.arch_env, irg, "-copymin");
 235 #endif
 236
 237                         /* ssa destruction */
 238                         be_ssa_destruction(chordal_env);
 239                         be_ssa_destruction_check(chordal_env);
 240                         be_ra_chordal_check(chordal_env);
 241 #ifdef DUMP_SSADESTR
 242                         dump_allocated_irg(env.arch_env, irg, "-ssadestr");
 243 #endif
 244
 245                         be_ra_chordal_done(chordal_env);
 246                         be_numbering_done(irg);
 247                 }
 248 #ifdef DUMP_END
 249                 dump_ir_block_graph_sched(session.irg, "-end");
 250 #endif
 251                 copystat_dump(irg);
 252 #endif /* if 0 */
 253         }
 254 }
 255
 256 void be_main(int argc, const char *argv[])
 257 {
 258   FILE *asm_output_file;
 259
 260   be_main_loop();
 261
 262   asm_output_file = fopen(argv[0], "w");
 263   firmbe_gen_code(asm_output_file);
 264   fclose(asm_output_file);
 265 }