gcc/tree-ssa-operands.h

   1 /* SSA operand management for trees.
   2    Copyright (C) 2003, 2005 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 2, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING.  If not, write to the Free
  18 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  19 02111-1307, USA.  */
  20
  21 #ifndef GCC_TREE_SSA_OPERANDS_H
  22 #define GCC_TREE_SSA_OPERANDS_H
  23
  24 /* Interface to SSA operands.  */
  25
  26
  27 /* This represents a pointer to a DEF operand.  */
  28 typedef tree *def_operand_p;
  29
  30 /* This represents a pointer to a USE operand.  */
  31 typedef ssa_use_operand_t *use_operand_p;
  32
  33 /* NULL operand types.  */
  34 #define NULL_USE_OPERAND_P              NULL
  35 #define NULL_DEF_OPERAND_P              NULL
  36
  37 /* This represents the DEF operands of a stmt.  */
  38 struct def_optype_d
  39 {
  40   struct def_optype_d *next;
  41   tree *def_ptr;
  42 };
  43 typedef struct def_optype_d *def_optype_p;
  44
  45 /* This represents the USE operands of a stmt.  */
  46 struct use_optype_d
  47 {
  48   struct use_optype_d *next;
  49   struct ssa_use_operand_d use_ptr;
  50 };
  51 typedef struct use_optype_d *use_optype_p;
  52
  53 /* This represents the MAY_DEFS for a stmt.  */
  54 struct maydef_optype_d
  55 {
  56   struct maydef_optype_d *next;
  57   tree def_var;
  58   tree use_var;
  59   struct ssa_use_operand_d use_ptr;
  60 };
  61 typedef struct maydef_optype_d *maydef_optype_p;
  62
  63 /* This represents the VUSEs for a stmt.  */
  64 struct vuse_optype_d
  65 {
  66   struct vuse_optype_d *next;
  67   tree use_var;
  68   struct ssa_use_operand_d use_ptr;
  69 };
  70 typedef struct vuse_optype_d *vuse_optype_p;
  71
  72 /* This represents the V_MUST_DEFS for a stmt.  */
  73 struct mustdef_optype_d
  74 {
  75   struct mustdef_optype_d *next;
  76   tree def_var;
  77   tree kill_var;
  78   struct ssa_use_operand_d use_ptr;
  79 };
  80 typedef struct mustdef_optype_d *mustdef_optype_p;
  81
  82
  83 #define SSA_OPERAND_MEMORY_SIZE         (2048 - sizeof (void *))
  84
  85 struct ssa_operand_memory_d GTY((chain_next("%h.next")))
  86 {
  87   struct ssa_operand_memory_d *next;
  88   char mem[SSA_OPERAND_MEMORY_SIZE];
  89 };
  90
  91
  92 /* This represents the operand cache for a stmt.  */
  93 struct stmt_operands_d
  94 {
  95   /* Statement operands.  */
  96   struct def_optype_d * def_ops;
  97   struct use_optype_d * use_ops;
  98
  99   /* Virtual operands (V_MAY_DEF, VUSE, and V_MUST_DEF).  */
 100   struct maydef_optype_d * maydef_ops;
 101   struct vuse_optype_d * vuse_ops;
 102   struct mustdef_optype_d * mustdef_ops;
 103 };
 104
 105 typedef struct stmt_operands_d *stmt_operands_p;
 106
 107 #define USE_FROM_PTR(PTR)       get_use_from_ptr (PTR)
 108 #define DEF_FROM_PTR(PTR)       get_def_from_ptr (PTR)
 109 #define SET_USE(USE, V)         set_ssa_use_from_ptr (USE, V)
 110 #define SET_DEF(DEF, V)         ((*(DEF)) = (V))
 111
 112 #define USE_STMT(USE)           (USE)->stmt
 113
 114 #define DEF_OPS(STMT)           (stmt_ann (STMT)->operands.def_ops)
 115 #define USE_OPS(STMT)           (stmt_ann (STMT)->operands.use_ops)
 116 #define VUSE_OPS(STMT)          (stmt_ann (STMT)->operands.vuse_ops)
 117 #define MAYDEF_OPS(STMT)        (stmt_ann (STMT)->operands.maydef_ops)
 118 #define MUSTDEF_OPS(STMT)       (stmt_ann (STMT)->operands.mustdef_ops)
 119
 120 #define USE_OP_PTR(OP)          (&((OP)->use_ptr))
 121 #define USE_OP(OP)              (USE_FROM_PTR (USE_OP_PTR (OP)))
 122
 123 #define DEF_OP_PTR(OP)          ((OP)->def_ptr)
 124 #define DEF_OP(OP)              (DEF_FROM_PTR (DEF_OP_PTR (OP)))
 125
 126 #define VUSE_OP_PTR(OP)         USE_OP_PTR(OP)
 127 #define VUSE_OP(OP)             ((OP)->use_var)
 128
 129 #define MAYDEF_RESULT_PTR(OP)   (&((OP)->def_var))
 130 #define MAYDEF_RESULT(OP)       ((OP)->def_var)
 131 #define MAYDEF_OP_PTR(OP)       USE_OP_PTR (OP)
 132 #define MAYDEF_OP(OP)           ((OP)->use_var)
 133
 134 #define MUSTDEF_RESULT_PTR(OP)  (&((OP)->def_var))
 135 #define MUSTDEF_RESULT(OP)      ((OP)->def_var)
 136 #define MUSTDEF_KILL_PTR(OP)    USE_OP_PTR (OP)
 137 #define MUSTDEF_KILL(OP)        ((OP)->kill_var)
 138
 139 #define PHI_RESULT_PTR(PHI)     get_phi_result_ptr (PHI)
 140 #define PHI_RESULT(PHI)         DEF_FROM_PTR (PHI_RESULT_PTR (PHI))
 141 #define SET_PHI_RESULT(PHI, V)  SET_DEF (PHI_RESULT_PTR (PHI), (V))
 142
 143 #define PHI_ARG_DEF_PTR(PHI, I) get_phi_arg_def_ptr ((PHI), (I))
 144 #define PHI_ARG_DEF(PHI, I)     USE_FROM_PTR (PHI_ARG_DEF_PTR ((PHI), (I)))
 145 #define SET_PHI_ARG_DEF(PHI, I, V)                                      \
 146                                 SET_USE (PHI_ARG_DEF_PTR ((PHI), (I)), (V))
 147 #define PHI_ARG_DEF_FROM_EDGE(PHI, E)                                   \
 148                                 PHI_ARG_DEF ((PHI), (E)->dest_idx)
 149 #define PHI_ARG_DEF_PTR_FROM_EDGE(PHI, E)                               \
 150                                 PHI_ARG_DEF_PTR ((PHI), (E)->dest_idx)
 151 #define PHI_ARG_INDEX_FROM_USE(USE)   phi_arg_index_from_use (USE)
 152
 153
 154 extern void init_ssa_operands (void);
 155 extern void fini_ssa_operands (void);
 156 extern void update_stmt_operands (tree);
 157 extern bool verify_imm_links (FILE *f, tree var);
 158
 159 extern void copy_virtual_operands (tree, tree);
 160 extern void create_ssa_artficial_load_stmt (tree, tree);
 161
 162 extern void dump_immediate_uses (FILE *file);
 163 extern void dump_immediate_uses_for (FILE *file, tree var);
 164 extern void debug_immediate_uses (void);
 165 extern void debug_immediate_uses_for (tree var);
 166
 167 extern bool ssa_call_clobbered_cache_valid;
 168 extern bool ssa_ro_call_cache_valid;
 169
 170 extern bool ssa_operands_active (void);
 171
 172 enum ssa_op_iter_type {
 173   ssa_op_iter_none = 0,
 174   ssa_op_iter_tree,
 175   ssa_op_iter_use,
 176   ssa_op_iter_def,
 177   ssa_op_iter_maymustdef
 178 };
 179 /* This structure is used in the operand iterator loops.  It contains the
 180    items required to determine which operand is retrieved next.  During
 181    optimization, this structure is scalarized, and any unused fields are
 182    optimized away, resulting in little overhead.  */
 183
 184 typedef struct ssa_operand_iterator_d
 185 {
 186   def_optype_p defs;
 187   use_optype_p uses;
 188   vuse_optype_p vuses;
 189   maydef_optype_p maydefs;
 190   maydef_optype_p mayuses;
 191   mustdef_optype_p mustdefs;
 192   mustdef_optype_p mustkills;
 193   enum ssa_op_iter_type iter_type;
 194   int phi_i;
 195   int num_phi;
 196   tree phi_stmt;
 197   bool done;
 198 } ssa_op_iter;
 199
 200 /* These flags are used to determine which operands are returned during
 201    execution of the loop.  */
 202 #define SSA_OP_USE              0x01    /* Real USE operands.  */
 203 #define SSA_OP_DEF              0x02    /* Real DEF operands.  */
 204 #define SSA_OP_VUSE             0x04    /* VUSE operands.  */
 205 #define SSA_OP_VMAYUSE          0x08    /* USE portion of V_MAY_DEFS.  */
 206 #define SSA_OP_VMAYDEF          0x10    /* DEF portion of V_MAY_DEFS.  */
 207 #define SSA_OP_VMUSTDEF         0x20    /* V_MUST_DEF definitions.  */
 208 #define SSA_OP_VMUSTKILL        0x40    /* V_MUST_DEF kills.  */
 209
 210 /* These are commonly grouped operand flags.  */
 211 #define SSA_OP_VIRTUAL_USES     (SSA_OP_VUSE | SSA_OP_VMAYUSE)
 212 #define SSA_OP_VIRTUAL_DEFS     (SSA_OP_VMAYDEF | SSA_OP_VMUSTDEF)
 213 #define SSA_OP_VIRTUAL_KILLS    (SSA_OP_VMUSTKILL)
 214 #define SSA_OP_ALL_VIRTUALS     (SSA_OP_VIRTUAL_USES | SSA_OP_VIRTUAL_KILLS \
 215                                  | SSA_OP_VIRTUAL_DEFS)
 216 #define SSA_OP_ALL_USES         (SSA_OP_VIRTUAL_USES | SSA_OP_USE)
 217 #define SSA_OP_ALL_DEFS         (SSA_OP_VIRTUAL_DEFS | SSA_OP_DEF)
 218 #define SSA_OP_ALL_KILLS        (SSA_OP_VIRTUAL_KILLS)
 219 #define SSA_OP_ALL_OPERANDS     (SSA_OP_ALL_USES | SSA_OP_ALL_DEFS      \
 220                                  | SSA_OP_ALL_KILLS)
 221
 222 /* This macro executes a loop over the operands of STMT specified in FLAG,
 223    returning each operand as a 'tree' in the variable TREEVAR.  ITER is an
 224    ssa_op_iter structure used to control the loop.  */
 225 #define FOR_EACH_SSA_TREE_OPERAND(TREEVAR, STMT, ITER, FLAGS)   \
 226   for (TREEVAR = op_iter_init_tree (&(ITER), STMT, FLAGS);      \
 227        !op_iter_done (&(ITER));                                 \
 228        TREEVAR = op_iter_next_tree (&(ITER)))
 229
 230 /* This macro executes a loop over the operands of STMT specified in FLAG,
 231    returning each operand as a 'use_operand_p' in the variable USEVAR.
 232    ITER is an ssa_op_iter structure used to control the loop.  */
 233 #define FOR_EACH_SSA_USE_OPERAND(USEVAR, STMT, ITER, FLAGS)     \
 234   for (USEVAR = op_iter_init_use (&(ITER), STMT, FLAGS);        \
 235        !op_iter_done (&(ITER));                                 \
 236        USEVAR = op_iter_next_use (&(ITER)))
 237
 238 /* This macro executes a loop over the operands of STMT specified in FLAG,
 239    returning each operand as a 'def_operand_p' in the variable DEFVAR.
 240    ITER is an ssa_op_iter structure used to control the loop.  */
 241 #define FOR_EACH_SSA_DEF_OPERAND(DEFVAR, STMT, ITER, FLAGS)     \
 242   for (DEFVAR = op_iter_init_def (&(ITER), STMT, FLAGS);        \
 243        !op_iter_done (&(ITER));                                 \
 244        DEFVAR = op_iter_next_def (&(ITER)))
 245
 246 /* This macro executes a loop over the V_MAY_DEF operands of STMT.  The def
 247    and use for each V_MAY_DEF is returned in DEFVAR and USEVAR.
 248    ITER is an ssa_op_iter structure used to control the loop.  */
 249 #define FOR_EACH_SSA_MAYDEF_OPERAND(DEFVAR, USEVAR, STMT, ITER) \
 250   for (op_iter_init_maydef (&(ITER), STMT, &(USEVAR), &(DEFVAR));       \
 251        !op_iter_done (&(ITER));                                 \
 252        op_iter_next_maymustdef (&(USEVAR), &(DEFVAR), &(ITER)))
 253
 254 /* This macro executes a loop over the V_MUST_DEF operands of STMT.  The def
 255    and kill for each V_MUST_DEF is returned in DEFVAR and KILLVAR.
 256    ITER is an ssa_op_iter structure used to control the loop.  */
 257 #define FOR_EACH_SSA_MUSTDEF_OPERAND(DEFVAR, KILLVAR, STMT, ITER)       \
 258   for (op_iter_init_mustdef (&(ITER), STMT, &(KILLVAR), &(DEFVAR));     \
 259        !op_iter_done (&(ITER));                                 \
 260        op_iter_next_maymustdef (&(KILLVAR), &(DEFVAR), &(ITER)))
 261
 262 /* This macro executes a loop over the V_{MUST,MAY}_DEF of STMT.  The def
 263    and kill for each V_{MUST,MAY}_DEF is returned in DEFVAR and KILLVAR.
 264    ITER is an ssa_op_iter structure used to control the loop.  */
 265 #define FOR_EACH_SSA_MUST_AND_MAY_DEF_OPERAND(DEFVAR, KILLVAR, STMT, ITER)\
 266   for (op_iter_init_must_and_may_def (&(ITER), STMT, &(KILLVAR), &(DEFVAR));\
 267        !op_iter_done (&(ITER));                                 \
 268        op_iter_next_maymustdef (&(KILLVAR), &(DEFVAR), &(ITER)))
 269
 270 /* This macro will execute a loop over all the arguments of a PHI which
 271    match FLAGS.   A use_operand_p is always returned via USEVAR.  FLAGS
 272    can be either SSA_OP_USE or SSA_OP_VIRTUAL_USES or SSA_OP_ALL_USES.  */
 273 #define FOR_EACH_PHI_ARG(USEVAR, STMT, ITER, FLAGS)             \
 274   for ((USEVAR) = op_iter_init_phiuse (&(ITER), STMT, FLAGS);   \
 275        !op_iter_done (&(ITER));                                 \
 276        (USEVAR) = op_iter_next_use (&(ITER)))
 277
 278
 279 /* This macro will execute a loop over a stmt, regardless of whether it is
 280    a real stmt or a PHI node, looking at the USE nodes matching FLAGS.  */
 281 #define FOR_EACH_PHI_OR_STMT_USE(USEVAR, STMT, ITER, FLAGS)     \
 282   for ((USEVAR) = (TREE_CODE (STMT) == PHI_NODE                 \
 283                    ? op_iter_init_phiuse (&(ITER), STMT, FLAGS) \
 284                    : op_iter_init_use (&(ITER), STMT, FLAGS));  \
 285        !op_iter_done (&(ITER));                                 \
 286        (USEVAR) = op_iter_next_use (&(ITER)))
 287
 288 /* This macro will execute a loop over a stmt, regardless of whether it is
 289    a real stmt or a PHI node, looking at the DEF nodes matching FLAGS.  */
 290 #define FOR_EACH_PHI_OR_STMT_DEF(DEFVAR, STMT, ITER, FLAGS)     \
 291   for ((DEFVAR) = (TREE_CODE (STMT) == PHI_NODE                 \
 292                    ? op_iter_init_phidef (&(ITER), STMT, FLAGS) \
 293                    : op_iter_init_def (&(ITER), STMT, FLAGS));  \
 294        !op_iter_done (&(ITER));                                 \
 295        (DEFVAR) = op_iter_next_def (&(ITER)))
 296
 297 /* This macro returns an operand in STMT as a tree if it is the ONLY
 298    operand matching FLAGS.  If there are 0 or more than 1 operand matching
 299    FLAGS, then NULL_TREE is returned.  */
 300 #define SINGLE_SSA_TREE_OPERAND(STMT, FLAGS)                    \
 301   single_ssa_tree_operand (STMT, FLAGS)
 302
 303 /* This macro returns an operand in STMT as a use_operand_p if it is the ONLY
 304    operand matching FLAGS.  If there are 0 or more than 1 operand matching
 305    FLAGS, then NULL_USE_OPERAND_P is returned.  */
 306 #define SINGLE_SSA_USE_OPERAND(STMT, FLAGS)                     \
 307   single_ssa_use_operand (STMT, FLAGS)
 308
 309 /* This macro returns an operand in STMT as a def_operand_p if it is the ONLY
 310    operand matching FLAGS.  If there are 0 or more than 1 operand matching
 311    FLAGS, then NULL_DEF_OPERAND_P is returned.  */
 312 #define SINGLE_SSA_DEF_OPERAND(STMT, FLAGS)                     \
 313   single_ssa_def_operand (STMT, FLAGS)
 314
 315 /* This macro returns TRUE if there are no operands matching FLAGS in STMT.  */
 316 #define ZERO_SSA_OPERANDS(STMT, FLAGS)  zero_ssa_operands (STMT, FLAGS)
 317
 318 /* This macro counts the number of operands in STMT matching FLAGS.  */
 319 #define NUM_SSA_OPERANDS(STMT, FLAGS)   num_ssa_operands (STMT, FLAGS)
 320
 321 #endif  /* GCC_TREE_SSA_OPERANDS_H  */