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