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