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
  24 #define DF_RD            1      /* Reaching definitions.  */
  25 #define DF_RU            2      /* Reaching uses.  */
  26 #define DF_LR            4      /* Live registers.  */
  27 #define DF_DU_CHAIN      8      /* Def-use chain.  */
  28 #define DF_UD_CHAIN     16      /* Use-def chain.  */
  29 #define DF_REG_INFO     32      /* Register info.  */
  30 #define DF_RD_CHAIN     64      /* Reg-def chain.  */
  31 #define DF_RU_CHAIN    128      /* Reg-use chain.  */
  32 #define DF_ALL         255
  33 #define DF_HARD_REGS  1024
  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
  52 /* Define a register reference structure.  */
  53 struct ref
  54 {
  55   rtx reg;                      /* The register referenced.  */
  56   basic_block bb;               /* BB containing ref.  */
  57   rtx insn;                     /* Insn containing ref.  */
  58   rtx *loc;                     /* Loc is the location of the reg.  */
  59   struct df_link *chain;        /* Head of def-use or use-def chain.  */
  60   enum df_ref_type type;        /* Type of ref.  */
  61   int id;                       /* Ref index.  */
  62 };
  63
  64
  65 /* One of these structures is allocated for every insn.  */
  66 struct insn_info
  67 {
  68   struct df_link *defs;         /* Head of insn-def chain.  */
  69   struct df_link *uses;         /* Head of insn-use chain.  */
  70   /* ???? The following luid field should be considerd private so that
  71      we can change it on the fly to accomodate new insns?  */
  72   int luid;                     /* Logical UID.  */
  73 #if 0
  74   rtx insn;                     /* Backpointer to the insn.  */
  75 #endif
  76 };
  77
  78
  79 /* One of these structures is allocated for every reg.  */
  80 struct reg_info
  81 {
  82   struct df_link *defs;         /* Head of reg-def chain.  */
  83   struct df_link *uses;         /* Head of reg-use chain.  */
  84   int lifetime;
  85   int n_defs;
  86   int n_uses;
  87 };
  88
  89
  90 /* One of these structures is allocated for every basic block.  */
  91 struct bb_info
  92 {
  93   /* Reaching def bitmaps have def_id elements.  */
  94   bitmap rd_kill;
  95   bitmap rd_gen;
  96   bitmap rd_in;
  97   bitmap rd_out;
  98   /* Reaching use bitmaps have use_id elements.  */
  99   bitmap ru_kill;
 100   bitmap ru_gen;
 101   bitmap ru_in;
 102   bitmap ru_out;
 103   /* Live variable bitmaps have n_regs elements.  */
 104   bitmap lr_def;
 105   bitmap lr_use;
 106   bitmap lr_in;
 107   bitmap lr_out;
 108   int rd_valid;
 109   int ru_valid;
 110   int lr_valid;
 111 };
 112
 113
 114 struct df
 115 {
 116   int flags;                    /* Indicates what's recorded.  */
 117   struct bb_info *bbs;          /* Basic block table.  */
 118   struct ref **defs;            /* Def table, indexed by def_id.  */
 119   struct ref **uses;            /* Use table, indexed by use_id.  */
 120   struct ref **reg_def_last;    /* Indexed by regno.  */
 121   struct reg_info *regs;        /* Regs table, index by regno.  */
 122   unsigned int reg_size;        /* Size of regs table.  */
 123   struct insn_info *insns;      /* Insn table, indexed by insn UID.  */
 124   unsigned int insn_size;       /* Size of insn table.  */
 125   unsigned int def_id;          /* Next def ID.  */
 126   unsigned int def_size;        /* Size of def table.  */
 127   unsigned int n_defs;          /* Size of def bitmaps.  */
 128   unsigned int use_id;          /* Next use ID.  */
 129   unsigned int use_size;        /* Size of use table.  */
 130   unsigned int n_uses;          /* Size of use bitmaps.  */
 131   unsigned int n_bbs;           /* Number of basic blocks.  */
 132   unsigned int n_regs;          /* Number of regs.  */
 133   unsigned int def_id_save;     /* Saved next def ID.  */
 134   unsigned int use_id_save;     /* Saved next use ID.  */
 135   bitmap insns_modified;        /* Insns that (may) have changed.  */
 136   bitmap bbs_modified;          /* Blocks that (may) have changed.  */
 137   bitmap all_blocks;            /* All blocks in CFG.  */
 138   /* The bitmap vector of dominators or NULL if not computed.
 139      Ideally, this should be a pointer to a CFG object.  */
 140   bitmap *dom;
 141   int * dfs_order;
 142   int * rc_order;
 143   int * rts_order;
 144 };
 145
 146
 147 struct df_map
 148 {
 149   rtx old;
 150   rtx new;
 151 };
 152
 153
 154 #define DF_BB_INFO(REFS, BB) (&REFS->bbs[(BB)->index])
 155
 156
 157 /* Macros to access the elements within the ref structure.  */
 158 #define DF_REF_REAL_REG(REF) (GET_CODE ((REF)->reg) == SUBREG \
 159                                 ? SUBREG_REG ((REF)->reg) : ((REF)->reg))
 160 #define DF_REF_REGNO(REF) REGNO (DF_REF_REAL_REG (REF))
 161 #define DF_REF_REAL_LOC(REF) (GET_CODE ((REF)->reg) == SUBREG \
 162                                 ? &SUBREG_REG ((REF)->reg) : ((REF)->loc))
 163 #ifdef OLD_DF_INTERFACE
 164 #define DF_REF_REG(REF) DF_REF_REAL_REG(REF)
 165 #define DF_REF_LOC(REF) DF_REF_REAL_LOC(REF)
 166 #else
 167 #define DF_REF_REG(REF) ((REF)->reg)
 168 #define DF_REF_LOC(REF) ((REF)->loc)
 169 #endif
 170 #define DF_REF_BB(REF) ((REF)->bb)
 171 #define DF_REF_BBNO(REF) ((REF)->bb->index)
 172 #define DF_REF_INSN(REF) ((REF)->insn)
 173 #define DF_REF_INSN_UID(REF) (INSN_UID ((REF)->insn))
 174 #define DF_REF_TYPE(REF) ((REF)->type)
 175 #define DF_REF_CHAIN(REF) ((REF)->chain)
 176 #define DF_REF_ID(REF) ((REF)->id)
 177
 178 /* Macros to determine the reference type.  */
 179
 180 #define DF_REF_REG_DEF_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_DEF)
 181 #define DF_REF_REG_USE_P(REF) ((REF) && ! DF_REF_REG_DEF_P (REF))
 182 #define DF_REF_REG_MEM_STORE_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_MEM_STORE)
 183 #define DF_REF_REG_MEM_LOAD_P(REF) (DF_REF_TYPE (REF) == DF_REF_REG_MEM_LOAD)
 184 #define DF_REF_REG_MEM_P(REF) (DF_REF_REG_MEM_STORE_P (REF) \
 185                             || DF_REF_REG_MEM_LOAD_P (REF))
 186
 187
 188 /* Macros to access the elements within the reg_info structure table.  */
 189
 190 #define DF_REGNO_FIRST_DEF(DF, REGNUM) \
 191 ((DF)->regs[REGNUM].defs ? (DF)->regs[REGNUM].defs->ref : 0)
 192 #define DF_REGNO_LAST_USE(DF, REGNUM) \
 193 ((DF)->regs[REGNUM].uses ? (DF)->regs[REGNUM].uses->ref : 0)
 194
 195 #define DF_REGNO_FIRST_BB(DF, REGNUM) \
 196 (DF_REGNO_FIRST_DEF (DF, REGNUM) \
 197 ? DF_REF_BB (DF_REGNO_FIRST_DEF (DF, REGNUM)) : 0)
 198 #define DF_REGNO_LAST_BB(DF, REGNUM) \
 199 (DF_REGNO_LAST_USE (DF, REGNUM) \
 200 ? DF_REF_BB (DF_REGNO_LAST_USE (DF, REGNUM)) : 0)
 201
 202
 203 /* Macros to access the elements within the insn_info structure table.  */
 204
 205 #define DF_INSN_LUID(DF, INSN) ((DF)->insns[INSN_UID (INSN)].luid)
 206 #define DF_INSN_DEFS(DF, INSN) ((DF)->insns[INSN_UID (INSN)].defs)
 207 #define DF_INSN_USES(DF, INSN) ((DF)->insns[INSN_UID (INSN)].uses)
 208
 209
 210 /* Functions to build and analyse dataflow information.  */
 211
 212 extern struct df *df_init PARAMS ((void));
 213
 214 extern int df_analyse PARAMS ((struct df *, bitmap, int));
 215
 216 extern void df_finish PARAMS ((struct df *));
 217
 218 extern void df_dump PARAMS ((struct df *, int, FILE *));
 219
 220 /* Functions to modify insns.  */
 221
 222 extern void df_insn_modify PARAMS ((struct df *, basic_block, rtx));
 223
 224 extern rtx df_insn_delete PARAMS ((struct df *, basic_block, rtx));
 225
 226 extern rtx df_pattern_emit_before PARAMS ((struct df *, rtx,
 227                                            basic_block, rtx));
 228
 229 extern rtx df_jump_pattern_emit_after PARAMS ((struct df *, rtx,
 230                                                basic_block, rtx));
 231
 232 extern rtx df_pattern_emit_after PARAMS ((struct df *, rtx,
 233                                            basic_block, rtx));
 234
 235 extern rtx df_insn_move_before PARAMS ((struct df *, basic_block, rtx,
 236                                         basic_block, rtx));
 237
 238 extern int df_reg_replace PARAMS ((struct df *, bitmap, rtx, rtx));
 239
 240 extern int df_ref_reg_replace PARAMS ((struct df *, struct ref *, rtx, rtx));
 241
 242 extern int df_ref_remove PARAMS ((struct df *, struct ref *));
 243
 244 extern int df_insn_reg_replace PARAMS ((struct df *, basic_block,
 245                                         rtx, rtx, rtx));
 246
 247 extern int df_insn_mem_replace PARAMS ((struct df *, basic_block,
 248                                         rtx, rtx, rtx));
 249
 250 extern struct ref *df_bb_def_use_swap PARAMS ((struct df *, basic_block,
 251                                                rtx, rtx, unsigned int));
 252
 253
 254 /* Functions to query dataflow information.  */
 255
 256 extern basic_block df_regno_bb PARAMS((struct df *, unsigned int));
 257
 258 extern int df_reg_lifetime PARAMS ((struct df *, rtx));
 259
 260 extern int df_reg_global_p PARAMS ((struct df *, rtx));
 261
 262 extern int df_insn_regno_def_p PARAMS ((struct df *,
 263                                         basic_block, rtx, unsigned int));
 264
 265 extern int df_insn_dominates_all_uses_p PARAMS ((struct df *,
 266                                                  basic_block, rtx));
 267
 268 extern int df_insn_dominates_uses_p PARAMS ((struct df *, basic_block,
 269                                              rtx, bitmap));
 270
 271 extern int df_bb_reg_live_start_p PARAMS ((struct df *, basic_block, rtx));
 272
 273 extern int df_bb_reg_live_end_p PARAMS ((struct df *, basic_block, rtx));
 274
 275 extern int df_bb_regs_lives_compare PARAMS ((struct df *, basic_block,
 276                                              rtx, rtx));
 277
 278 extern rtx df_bb_single_def_use_insn_find PARAMS((struct df *, basic_block,
 279                                                   rtx, rtx));
 280
 281
 282 /* Functions for debugging from GDB.  */
 283
 284 extern void debug_df_insn PARAMS ((rtx));
 285
 286 extern void debug_df_regno PARAMS ((unsigned int));
 287
 288 extern void debug_df_reg PARAMS ((rtx));
 289
 290 extern void debug_df_defno PARAMS ((unsigned int));
 291
 292 extern void debug_df_useno PARAMS ((unsigned int));
 293
 294 extern void debug_df_ref PARAMS ((struct ref *));
 295
 296 extern void debug_df_chain PARAMS ((struct df_link *));
 297 extern void df_insn_debug PARAMS ((struct df *, rtx, FILE *));
 298 extern void df_insn_debug_regno PARAMS ((struct df *, rtx, FILE *));