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