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 #include <mcheck.h>
  12
  13 #include "obst.h"
  14 #include "bitset.h"
  15
  16 #include "irprog.h"
  17 #include "irgopt.h"
  18 #include "irgraph.h"
  19 #include "irdump.h"
  20 #include "phiclass.h"
  21 #include "irdom_t.h"
  22 #include "iredges_t.h"
  23 #include "irloop_t.h"
  24
  25 #include "be_t.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
  42 #include "beasm_dump_globals.h"
  43 #include "beasm_asm_gnu.h"
  44
  45 #undef DUMP_BEGIN
  46 #undef DUMP_PREPARED
  47 #undef DUMP_SPILL
  48 #undef DUMP_SCHED
  49 #undef DUMP_ALLOCATED
  50 #undef DUMP_COPYMIN
  51 #undef DUMP_SSADESTR
  52 #undef DUMP_END
  53
  54 #define N_PHASES 256
  55
  56 void be_init(void)
  57 {
  58         be_sched_init();
  59         be_liveness_init();
  60         be_numbering_init();
  61         be_ra_chordal_init();
  62         be_copy_opt_init();
  63         copystat_init();
  64         phi_class_init();
  65 }
  66
  67 static be_main_env_t *be_init_env(be_main_env_t *env)
  68 {
  69   const arch_isa_if_t *isa = &firm_isa;
  70
  71   obstack_init(&env->obst);
  72   env->dbg = firm_dbg_register("be.main");
  73   firm_dbg_set_mask(env->dbg, SET_LEVEL_1);
  74
  75   env->arch_env = obstack_alloc(&env->obst, sizeof(env->arch_env[0]));
  76   arch_env_init(env->arch_env, isa);
  77   env->arch_env->isa->init();
  78
  79   env->node_factory = obstack_alloc(&env->obst, sizeof(*env->node_factory));
  80   be_node_factory_init(env->node_factory, isa);
  81
  82   arch_env_add_irn_handler(env->arch_env, &firm_irn_handler);
  83   arch_env_add_irn_handler(env->arch_env,
  84       be_node_get_irn_handler(env->node_factory));
  85
  86   return env;
  87 }
  88
  89 static be_main_session_env_t *
  90 be_init_session_env(be_main_session_env_t *env,
  91     be_main_env_t *main_env, ir_graph *irg)
  92 {
  93   env->main_env = main_env;
  94   env->irg = irg;
  95
  96   return env;
  97 }
  98
  99 static void prepare_graph(be_main_session_env_t *s)
 100 {
 101         /* set the current graph (this is important for several firm functions) */
 102         current_ir_graph = s->irg;
 103
 104         /* Let the isa prepare the graph. */
 105         s->main_env->arch_env->isa->prepare_graph(s->irg);
 106
 107         /* Normalize proj nodes. */
 108         normalize_proj_nodes(s->irg);
 109
 110         /* Remove critical edges */
 111         remove_critical_cf_edges(s->irg);
 112
 113         /* Compute the dominance information. */
 114         free_dom_and_peace(s->irg);
 115         compute_doms(s->irg);
 116
 117         /* Compute the dominance frontiers */
 118         s->dom_front = be_compute_dominance_frontiers(s->irg);
 119
 120         /* Ensure, that the ir_edges are computed. */
 121         edges_activate(s->irg);
 122
 123         /* Compute loop nesting information (for weighting copies) */
 124         if (get_irg_loopinfo_state(s->irg) != (loopinfo_valid & loopinfo_cf_consistent))
 125                 construct_cf_backedges(s->irg);
 126
 127         be_check_dominance(s->irg);
 128 }
 129
 130 static void be_main_loop(void)
 131 {
 132         int i, n;
 133         be_main_env_t env;
 134         const arch_isa_if_t *isa;
 135
 136         be_init_env(&env);
 137         isa = arch_env_get_isa(env.arch_env);
 138
 139         /* For all graphs */
 140         for(i = 0, n = get_irp_n_irgs(); i < n; ++i) {
 141                 int j, m;
 142                 ir_graph *irg = get_irp_irg(i);
 143                 be_main_session_env_t session;
 144
 145                 DBG((env.dbg, LEVEL_1, "====> IRG: %F\n", irg));
 146 #ifdef DUMP_BEGIN
 147                 dump_ir_block_graph(irg, "-begin");
 148 #endif
 149
 150                 /* Init the session. */
 151                 be_init_session_env(&session, &env, irg);
 152
 153                 /* Compute some analyses and prepare the graph for backend use. */
 154                 prepare_graph(&session);
 155 #ifdef DUMP_PREPARED
 156                 dump_dominator_information(true);
 157                 dump_ir_block_graph(irg, "-prepared");
 158                 dump_dominator_information(false);
 159 #endif
 160
 161                 /* Schedule the graphs. */
 162                 list_sched(irg, trivial_selector);
 163 #ifdef DUMP_SCHED
 164                 dump_ir_block_graph_sched(irg, "-sched");
 165 #endif
 166
 167                 /* Verify the schedule */
 168                 sched_verify_irg(irg);
 169
 170                 /* Build liveness information */
 171                 be_liveness(irg);
 172
 173                 /* Perform the following for each register class. */
 174                 for(j = 0, m = isa->get_n_reg_class(); j < m; ++j) {
 175                         be_chordal_env_t *chordal_env;
 176                         const arch_register_class_t *cls = isa->get_reg_class(j);
 177                         DBG((env.dbg, LEVEL_1, "----> Reg class: %s\n", cls->name));
 178
 179                         /* spilling */
 180                         be_spill_ilp(&session, cls);
 181 #ifdef DUMP_SPILL
 182                         dump_ir_block_graph_sched(session.irg, "-spill");
 183 #endif
 184                         be_liveness(irg);
 185                         be_numbering(irg);
 186                         be_check_pressure(&session, cls);
 187
 188 #if 0
 189                         {
 190                                 FILE *f;
 191                                 char buf[128];
 192                                 ir_snprintf(buf, sizeof(buf), "%F_%s-live.txt", irg, cls->name);
 193                                 if((f = fopen(buf, "wt")) != NULL) {
 194                                         be_liveness_dump(session.irg, f);
 195                                         fclose(f);
 196                                 }
 197                         }
 198 #endif
 199
 200                         /* allocation */
 201                         chordal_env = be_ra_chordal(&session, cls);
 202 #ifdef DUMP_ALLOCATED
 203                         dump_allocated_irg(env.arch_env, irg, "");
 204 #endif
 205
 206                         /* copy minimization */
 207                         copystat_collect_cls(chordal_env);
 208                         be_copy_opt(chordal_env);
 209 #ifdef DUMP_COPYMIN
 210                         dump_allocated_irg(env.arch_env, irg, "-copymin");
 211 #endif
 212
 213                         /* ssa destruction */
 214                         be_ssa_destruction(chordal_env);
 215                         be_ssa_destruction_check(chordal_env);
 216                         be_ra_chordal_check(chordal_env);
 217 #ifdef DUMP_SSADESTR
 218                         dump_allocated_irg(env.arch_env, irg, "-ssadestr");
 219 #endif
 220
 221                         be_ra_chordal_done(chordal_env);
 222                         be_numbering_done(irg);
 223                 }
 224 #ifdef DUMP_END
 225                 dump_ir_block_graph_sched(session.irg, "-end");
 226 #endif
 227                 copystat_dump(irg);
 228         }
 229 }
 230
 231 void be_main(int argc, const char *argv[])
 232 {
 233         assembler_t *gnu_assembler;
 234         FILE *asm_output_file;
 235
 236         be_main_loop();
 237
 238 #if 0
 239         gnu_assembler = gnuasm_create_assembler();
 240         asm_output_file = fopen("asm_output.asm", "w");
 241
 242         asm_dump_globals(gnu_assembler);
 243         gnuasm_dump(gnu_assembler, asm_output_file);
 244         gnuasm_delete_assembler(gnu_assembler);
 245         fclose(asm_output_file);
 246 #endif
 247 }