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
  12 #include "obst.h"
  13 #include "bitset.h"
  14
  15 #include "irprog.h"
  16 #include "irgopt.h"
  17 #include "irgraph.h"
  18 #include "irdump.h"
  19 #include "phiclass.h"
  20 #include "irdom_t.h"
  21 #include "iredges_t.h"
  22 #include "irloop_t.h"
  23
  24 #include "be_t.h"
  25 #include "bechordal_t.h"
  26 #include "benumb_t.h"
  27 #include "besched_t.h"
  28 #include "belistsched.h"
  29 #include "belive_t.h"
  30 #include "beutil.h"
  31 #include "bechordal.h"
  32 #include "bearch.h"
  33 #include "becopyoptmain.h"
  34 #include "becopystat.h"
  35 #include "bessadestr.h"
  36 #include "bearch_firm.h"
  37 #include "benode_t.h"
  38 #include "beirgmod.h"
  39 #include "bedupl.h"
  40
  41 #include "beasm_dump_globals.h"
  42 #include "beasm_asm_gnu.h"
  43
  44 #undef DUMP_ALLOCATED
  45
  46 #define N_PHASES 256
  47
  48
  49 void be_init(void)
  50 {
  51         be_sched_init();
  52         be_liveness_init();
  53         be_numbering_init();
  54         be_ra_chordal_init();
  55         be_copy_opt_init();
  56         copystat_init();
  57 }
  58
  59 static be_main_env_t *be_init_env(be_main_env_t *env)
  60 {
  61   const arch_isa_if_t *isa = &firm_isa;
  62
  63   obstack_init(&env->obst);
  64
  65   env->arch_env = obstack_alloc(&env->obst, sizeof(env->arch_env[0]));
  66   arch_env_init(env->arch_env, isa);
  67   env->arch_env->isa->init();
  68
  69   env->node_factory = obstack_alloc(&env->obst, sizeof(*env->node_factory));
  70   be_node_factory_init(env->node_factory, isa);
  71
  72   arch_env_add_irn_handler(env->arch_env, &firm_irn_handler);
  73   arch_env_add_irn_handler(env->arch_env,
  74       be_node_get_irn_handler(env->node_factory));
  75
  76   return env;
  77 }
  78
  79 static be_main_session_env_t *
  80 be_init_session_env(be_main_session_env_t *env,
  81     be_main_env_t *main_env, ir_graph *irg)
  82 {
  83   env->main_env = main_env;
  84   env->irg = irg;
  85
  86   return env;
  87 }
  88
  89 static void prepare_graph(be_main_session_env_t *s)
  90 {
  91         /*
  92          * Duplicate consts in each block
  93          * (This is just for the firm dummy backend)
  94          */
  95         // localize_consts(s->irg);
  96
  97         /* Remove critical edges */
  98         remove_critical_cf_edges(s->irg);
  99
 100         /* Compute the dominance information. */
 101         free_dom_and_peace(s->irg);
 102         compute_doms(s->irg);
 103
 104         /* Compute the dominance frontiers */
 105         s->dom_front = be_compute_dominance_frontiers(s->irg);
 106
 107         /* Ensure, that the ir_edges are computed. */
 108         edges_assure(s->irg);
 109
 110         /* Compute loop nesting information (for weighting copies) */
 111         if (get_irg_loopinfo_state(s->irg) != (loopinfo_valid & loopinfo_cf_consistent))
 112                 construct_cf_backedges(s->irg);
 113
 114         dump_dominator_information(true);
 115         dump_ir_block_graph(s->irg, "-prepared");
 116         dump_dominator_information(false);
 117 }
 118
 119 static void be_main_loop(void)
 120 {
 121         int i, n;
 122         be_main_env_t env;
 123         const arch_isa_if_t *isa;
 124
 125         be_init_env(&env);
 126         isa = arch_env_get_isa(env.arch_env);
 127
 128         /* For all graphs */
 129         for(i = 0, n = get_irp_n_irgs(); i < n; ++i) {
 130                 int j, m;
 131                 ir_graph *irg = get_irp_irg(i);
 132                 be_main_session_env_t session;
 133
 134                 /* Init the session. */
 135                 be_init_session_env(&session, &env, irg);
 136
 137                 /* Compute some analyses and prepare the graph for backend use. */
 138                 prepare_graph(&session);
 139
 140                 /* Schedule the graphs. */
 141                 list_sched(irg, trivial_selector);
 142
 143                 /* Verify the schedule */
 144                 sched_verify_irg(irg);
 145
 146                 /* Remove all cases where a phi and one of its arguments interfere */
 147                 be_eliminate_phi_interferences(&session);
 148                 dump_ir_block_graph(session.irg, "-prephase");
 149
 150                 be_numbering(irg);
 151
 152                 /* Liveness analysis */
 153                 be_liveness(irg);
 154
 155                 dump_ir_block_graph_sched(irg, "-sched");
 156
 157                 copystat_reset();
 158                 copystat_collect_irg(irg, env.arch_env);
 159
 160     /*
 161      * Spilling changed the liveness information.
 162      * Recompute it now.
 163      */
 164     be_liveness(irg);
 165
 166     /*
 167      * Verifying the schedule once again cannot hurt.
 168      */
 169     sched_verify_irg(irg);
 170
 171                 /* Perform the following for each register class. */
 172                 for(j = 0, m = isa->get_n_reg_class(); j < m; ++j) {
 173                         be_chordal_env_t *chordal_env;
 174                         const arch_register_class_t *cls = isa->get_reg_class(j);
 175
 176                         chordal_env = be_ra_chordal(irg, env.arch_env, cls);
 177
 178 #ifdef DUMP_ALLOCATED
 179                         dump_allocated_irg(env.arch_env, irg, "");
 180 #endif
 181                         copystat_collect_cls(chordal_env);
 182
 183                         be_copy_opt(chordal_env);
 184
 185                         be_ssa_destruction(&session, chordal_env);
 186                         be_ssa_destruction_check(&session, chordal_env);
 187                         be_ra_chordal_check(chordal_env);
 188
 189                         be_ra_chordal_done(chordal_env);
 190                 }
 191
 192                 copystat_dump_pretty(irg);
 193     be_numbering_done(irg);
 194         }
 195 }
 196
 197 void be_main(int argc, const char *argv[])
 198 {
 199         assembler_t *gnu_assembler;
 200         FILE *asm_output_file;
 201
 202         be_main_loop();
 203         gnu_assembler = gnuasm_create_assembler();
 204         asm_output_file = fopen("asm_output.asm", "w");
 205
 206         asm_dump_globals(gnu_assembler);
 207         gnuasm_dump(gnu_assembler, asm_output_file);
 208         gnuasm_delete_assembler(gnu_assembler);
 209         fclose(asm_output_file);
 210 }