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