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