gcc/df.h

   1 /* Form lists of pseudo register references for autoinc optimization
   2    for GNU compiler.  This is part of flow optimization.
   3    Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
   4    Contributed by Michael P. Hayes (m.hayes@elec.canterbury.ac.nz)
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 2, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING.  If not, write to the Free
  20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  21 02111-1307, USA.  */
  22
  23 #define DF_RD            1      /* Reaching definitions.  */
  24 #define DF_RU            2      /* Reaching uses.  */
  25 #define DF_LR            4      /* Live registers.  */
  26 #define DF_DU_CHAIN      8      /* Def-use chain.  */
  27 #define DF_UD_CHAIN     16      /* Use-def chain.  */
  28 #define DF_REG_INFO     32      /* Register info.  */
  29 #define DF_RD_CHAIN     64      /* Reg-def chain.  */
  30 #define DF_RU_CHAIN    128      /* Reg-use chain.  */
  31 #define DF_ALL         255
  32 #define DF_HARD_REGS  1024
  33 #define DF_EQUIV_NOTES 2048     /* Mark uses present in EQUIV/EQUAL notes.  */
  34
  35 enum df_ref_type {DF_REF_REG_DEF, DF_REF_REG_USE, DF_REF_REG_MEM_LOAD,
  36                   DF_REF_REG_MEM_STORE};
  37
  38 #define DF_REF_TYPE_NAMES {"def", "use", "mem load", "mem store"}
  39
  40 /* ???> Perhaps all these data structures should be made private
  41    to enforce the interface.  */
  42
  43
  44 /* Link on a def-use or use-def chain.  */
  45 struct df_link
  46 {
  47   struct df_link *next;
  48   struct ref *ref;
  49 };
  50
  51 enum df_ref_flags
  52   {
  53     DF_REF_READ_WRITE = 1,
  54
  55     /* This flag is set on register references itself representing a or
  56        being inside a subreg on machines which have CLASS_CANNOT_CHANGE_MODE
  57        and where the mode change of that subreg expression is invalid for
  58        this class.  Note, that this flag can also be set on df_refs
  59        representing the REG itself (i.e. one might not see the subreg
  60        anyore).  Also note, that this flag is set also for hardreg refs.
  61        I.e. you must check yourself if it's a pseudo.  */
  62     DF_REF_MODE_CHANGE = 2
  63   };
  64
  65 /* Define a register reference structure.  */
  66 struct ref
  67 {
  68   rtx reg;                      /* The register referenced.  */
  69   rtx insn;                     /* Insn containing ref.  */
  70   rtx *loc;                     /* Loc is the location of the reg.  */
  71   struct df_link *chain;        /* Head of def-use or use-def chain.  */
  72   enum df_ref_type type;        /* Type of ref.  */
  73   unsigned int id;              /* Ref index.  */
  74   enum df_ref_flags flags;      /* Various flags.  */
  75 };
  76
  77
  78 /* One of these structures is allocated for every insn.  */
  79 struct insn_info
  80 {
  81   struct df_link *defs;         /* Head of insn-def chain.  */
  82   struct df_link *uses;         /* Head of insn-use chain.  */
  83   /* ???? The following luid field should be considerd private so that
  84      we can change it on the fly to accommodate new insns?  */
  85   int luid;                     /* Logical UID.  */
  86 #if 0
  87   rtx insn;                     /* Backpointer to the insn.  */
  88 #endif
  89 };
  90
  91
  92 /* One of these structures is allocated for every reg.  */
  93 struct reg_info
  94 {
  95   struct df_link *defs;         /* Head of reg-def chain.  */
  96   struct df_link *uses;         /* Head of reg-use chain.  */
  97   int lifetime;
  98   int n_defs;
  99   int n_uses;
 100 };
 101
 102
 103 /* One of these structures is allocated for every basic block.  */
 104 struct bb_info
 105 {
 106   /* Reaching def bitmaps have def_id elements.  */
 107   bitmap rd_kill;
 108   bitmap rd_gen;
 109   bitmap rd_in;
 110   bitmap rd_out;
 111   /* Reaching use bitmaps have use_id elements.  */
 112   bitmap ru_kill;
 113   bitmap ru_gen;
 114   bitmap ru_in;
 115   bitmap ru_out;
 116   /* Live variable bitmaps have n_regs elements.  */
 117   bitmap lr_def;
 118   bitmap lr_use;
 119   bitmap lr_in;
 120   bitmap lr_out;
 121   int rd_valid;
 122   int ru_valid;
 123   int lr_valid;
 124 };
 125
 126
 127 struct df
 128 {
 129   int flags;                    /* Indicates what's recorded.  */
 130   struct bb_info *bbs;          /* Basic block table.  */
 131   struct ref **defs;            /* Def table, indexed by def_id.  */
 132   struct ref **uses;            /* Use table, indexed by use_id.  */
 133   struct ref **reg_def_last;    /* Indexed by regno.  */
 134   struct reg_info *regs;        /* Regs table, index by regno.  */
 135   unsigned int reg_size;        /* Size of regs table.  */
 136   struct insn_info *insns;      /* Insn table, indexed by insn UID.  */
 137   unsigned int insn_size;       /* Size of insn table.  */
 138   unsigned int def_id;          /* Next def ID.  */
 139   unsigned int def_size;        /* Size of def table.  */
 140   unsigned int n_defs;          /* Size of def bitmaps.  */
 141   unsigned int use_id;          /* Next use ID.  */
 142   unsigned int use_size;        /* Size of use table.  */
 143   unsigned int n_uses;          /* Size of use bitmaps.  */
 144   unsigned int n_bbs;           /* Number of basic blocks.  */
 145   unsigned int n_regs;          /* Number of regs.  */
 146   unsigned int def_id_save;     /* Saved next def ID.  */
 147   unsigned int use_id_save;     /* Saved next use ID.  */
 148   bitmap insns_modified;        /* Insns that (may) have changed.  */
 149   bitmap bbs_modified;          /* Blocks that (may) have changed.  */
 150   bitmap all_blocks;            /* All blocks in CFG.  */
 151   /* The sbitmap vector of dominators or NULL if not computed.
 152      Ideally, this should be a pointer to a CFG object.  */
 153   sbitmap *dom;
 154   int * dfs_order; /* DFS order -> block number */
 155   int * rc_order; /* reverse completion order -> block number */
 156   int * rts_order; /* reverse top sort order -> block number */
 157   int * inverse_rc_map; /* block number -> reverse completion order */
 158   int * inverse_dfs_map; /* block number -> DFS order */
 159   int * inverse_rts_map; /* block number -> reverse top-sort order */
 160 };
 161
 162
 163 struct df_map
 164 {
 165   rtx old;
 166   rtx new;
 167 };
 168
 169
 170 #define DF_BB_INFO(REFS, BB) (&REFS->bbs[(BB)->index])
 171
 172
 173 /* Macros to access the elements within the ref structure.  */
 174 #define DF_REF_REAL_REG(REF) (GET_CODE ((REF)->reg) == SUBREG \
 175                                 ? SUBREG_REG ((REF)->reg) : ((REF)->reg))
 176 #define DF_REF_REGNO(REF) REGNO (DF_REF_REAL_REG (REF))
 177 #define DF_REF_REAL_LOC(REF) (GET_CODE ((REF)->reg) == SUBREG \
 178                                 ? &SUBREG_REG ((REF)->reg) : ((REF)->loc))
 179 #ifdef OLD_DF_INTERFACE
 180 #define DF_REF_REG(REF) DF_REF_REAL_REG(REF)
 181 #define DF_REF_LOC(REF) DF_REF_REAL_LOC(REF)
 182 #else
 183 #define DF_REF_REG(REF) ((REF)->reg)
 184 #define DF_REF_LOC(REF) ((REF)->loc)
 185 #endif
 186 #define DF_REF_BB(REF) (BLOCK_FOR_INSN ((REF)->insn))
 187 #define DF_REF_BBNO(REF) (BLOCK_FOR_INSN ((REF)->insn)->index)
 188 #define DF_REF_INSN(REF) ((REF)->insn)
 189 #define DF_REF_INSN_UID(REF) (INSN_UID ((REF)->insn))
 190 #define DF_REF_TYPE(REF) ((REF)->type)
 191 #define DF_REF_CHAIN(REF) ((REF)->chain)
 192 #define DF_REF_ID(REF) ((REF)->id)
 193 #define DF_REF_FLAGS(REF) ((REF)->flags)
 194
 195 /* Macros to determine the reference type.  */
 196
 197 #define DF_REF_REG_DEF_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_DEF)
 198 #define DF_REF_REG_USE_P(REF) ((REF) && ! DF_REF_REG_DEF_P (REF))
 199 #define DF_REF_REG_MEM_STORE_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_MEM_STORE)
 200 #define DF_REF_REG_MEM_LOAD_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_MEM_LOAD)
 201 #define DF_REF_REG_MEM_P(REF) (DF_REF_REG_MEM_STORE_P (REF) \
 202                             || DF_REF_REG_MEM_LOAD_P (REF))
 203
 204
 205 /* Macros to access the elements within the reg_info structure table.  */
 206
 207 #define DF_REGNO_FIRST_DEF(DF, REGNUM) \
 208 ((DF)->regs[REGNUM].defs ? (DF)->regs[REGNUM].defs->ref : 0)
 209 #define DF_REGNO_LAST_USE(DF, REGNUM) \
 210 ((DF)->regs[REGNUM].uses ? (DF)->regs[REGNUM].uses->ref : 0)
 211
 212 #define DF_REGNO_FIRST_BB(DF, REGNUM) \
 213 (DF_REGNO_FIRST_DEF (DF, REGNUM) \
 214 ? DF_REF_BB (DF_REGNO_FIRST_DEF (DF, REGNUM)) : 0)
 215 #define DF_REGNO_LAST_BB(DF, REGNUM) \
 216 (DF_REGNO_LAST_USE (DF, REGNUM) \
 217 ? DF_REF_BB (DF_REGNO_LAST_USE (DF, REGNUM)) : 0)
 218
 219
 220 /* Macros to access the elements within the insn_info structure table.  */
 221
 222 #define DF_INSN_LUID(DF, INSN) ((DF)->insns[INSN_UID (INSN)].luid)
 223 #define DF_INSN_DEFS(DF, INSN) ((DF)->insns[INSN_UID (INSN)].defs)
 224 #define DF_INSN_USES(DF, INSN) ((DF)->insns[INSN_UID (INSN)].uses)
 225
 226
 227 /* Functions to build and analyse dataflow information.  */
 228
 229 extern struct df *df_init PARAMS ((void));
 230
 231 extern int df_analyse PARAMS ((struct df *, bitmap, int));
 232
 233 extern void df_finish PARAMS ((struct df *));
 234
 235 extern void df_dump PARAMS ((struct df *, int, FILE *));
 236
 237 /* Functions to modify insns.  */
 238
 239 extern void df_insn_modify PARAMS ((struct df *, basic_block, rtx));
 240
 241 extern rtx df_insn_delete PARAMS ((struct df *, basic_block, rtx));
 242
 243 extern rtx df_pattern_emit_before PARAMS ((struct df *, rtx,
 244                                            basic_block, rtx));
 245
 246 extern rtx df_jump_pattern_emit_after PARAMS ((struct df *, rtx,
 247                                                basic_block, rtx));
 248
 249 extern rtx df_pattern_emit_after PARAMS ((struct df *, rtx,
 250                                            basic_block, rtx));
 251
 252 extern rtx df_insn_move_before PARAMS ((struct df *, basic_block, rtx,
 253                                         basic_block, rtx));
 254
 255 extern int df_reg_replace PARAMS ((struct df *, bitmap, rtx, rtx));
 256
 257 extern int df_ref_reg_replace PARAMS ((struct df *, struct ref *, rtx, rtx));
 258
 259 extern int df_ref_remove PARAMS ((struct df *, struct ref *));
 260
 261 extern int df_insn_reg_replace PARAMS ((struct df *, basic_block,
 262                                         rtx, rtx, rtx));
 263
 264 extern int df_insn_mem_replace PARAMS ((struct df *, basic_block,
 265                                         rtx, rtx, rtx));
 266
 267 extern struct ref *df_bb_def_use_swap PARAMS ((struct df *, basic_block,
 268                                                rtx, rtx, unsigned int));
 269
 270
 271 /* Functions to query dataflow information.  */
 272
 273 extern basic_block df_regno_bb PARAMS((struct df *, unsigned int));
 274
 275 extern int df_reg_lifetime PARAMS ((struct df *, rtx));
 276
 277 extern int df_reg_global_p PARAMS ((struct df *, rtx));
 278
 279 extern int df_insn_regno_def_p PARAMS ((struct df *,
 280                                         basic_block, rtx, unsigned int));
 281
 282 extern int df_insn_dominates_all_uses_p PARAMS ((struct df *,
 283                                                  basic_block, rtx));
 284
 285 extern int df_insn_dominates_uses_p PARAMS ((struct df *, basic_block,
 286                                              rtx, bitmap));
 287
 288 extern int df_bb_reg_live_start_p PARAMS ((struct df *, basic_block, rtx));
 289
 290 extern int df_bb_reg_live_end_p PARAMS ((struct df *, basic_block, rtx));
 291
 292 extern int df_bb_regs_lives_compare PARAMS ((struct df *, basic_block,
 293                                              rtx, rtx));
 294
 295 extern rtx df_bb_single_def_use_insn_find PARAMS((struct df *, basic_block,
 296                                                   rtx, rtx));
 297
 298
 299 /* Functions for debugging from GDB.  */
 300
 301 extern void debug_df_insn PARAMS ((rtx));
 302
 303 extern void debug_df_regno PARAMS ((unsigned int));
 304
 305 extern void debug_df_reg PARAMS ((rtx));
 306
 307 extern void debug_df_defno PARAMS ((unsigned int));
 308
 309 extern void debug_df_useno PARAMS ((unsigned int));
 310
 311 extern void debug_df_ref PARAMS ((struct ref *));
 312
 313 extern void debug_df_chain PARAMS ((struct df_link *));
 314 extern void df_insn_debug PARAMS ((struct df *, rtx, FILE *));
 315 extern void df_insn_debug_regno PARAMS ((struct df *, rtx, FILE *));
 316 /* Meet over any path (UNION) or meet over all paths (INTERSECTION) */
 317 enum df_confluence_op
 318   {
 319     UNION,
 320     INTERSECTION
 321   };
 322 /* Dataflow direction */
 323 enum df_flow_dir
 324   {
 325     FORWARD,
 326     BACKWARD
 327   };
 328
 329 typedef void (*transfer_function_sbitmap) PARAMS ((int, int *, sbitmap, sbitmap,
 330                                            sbitmap, sbitmap, void *));
 331 typedef void (*transfer_function_bitmap) PARAMS ((int, int *, bitmap, bitmap,
 332                                           bitmap, bitmap, void *));
 333
 334 extern void iterative_dataflow_sbitmap PARAMS ((sbitmap *, sbitmap *,
 335                                                 sbitmap *, sbitmap *,
 336                                                 bitmap, enum df_flow_dir,
 337                                                 enum df_confluence_op,
 338                                                 transfer_function_sbitmap,
 339                                                 int *, void *));
 340 extern void iterative_dataflow_bitmap PARAMS ((bitmap *, bitmap *, bitmap *,
 341                                                bitmap *, bitmap,
 342                                                enum df_flow_dir,
 343                                                enum df_confluence_op,
 344                                                transfer_function_bitmap,
 345                                                int *, void *));