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, 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301, 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 typedef struct vuse_element_d
  54 {
  55   tree use_var;
  56   struct ssa_use_operand_d use_ptr;
  57 } vuse_element_t;
  58
  59 typedef struct vuse_vec_d
  60 {
  61   int num_vuse;
  62   vuse_element_t uses[1];
  63 } vuse_vec_t;
  64 typedef struct vuse_vec_d *vuse_vec_p;
  65
  66 #define VUSE_VECT_NUM_ELEM(V)           (V).num_vuse
  67 #define VUSE_VECT_ELEMENT_NC(V,X)       (V).uses[(X)]
  68 #define VUSE_ELEMENT_PTR_NC(V,X)        (&(VUSE_VECT_ELEMENT_NC ((V),(X)).use_ptr))
  69 #define VUSE_ELEMENT_VAR_NC(V,X)        (VUSE_VECT_ELEMENT_NC ((V),(X)).use_var)
  70
  71 #ifdef ENABLE_CHECKING
  72 #define VUSE_VECT_ELEMENT(V,X)                                          \
  73     (gcc_assert ((X) >= 0 && (X) < VUSE_VECT_NUM_ELEM (V)),             \
  74      VUSE_VECT_ELEMENT_NC (V,X))
  75
  76 #define VUSE_ELEMENT_PTR(V,X)                                           \
  77     (gcc_assert ((X) >= 0 && (X) < VUSE_VECT_NUM_ELEM (V)),             \
  78      VUSE_ELEMENT_PTR_NC (V, X))
  79
  80 #define SET_VUSE_VECT_ELEMENT(V,X,N)                                    \
  81     (gcc_assert ((X) >= 0 && (X) < VUSE_VECT_NUM_ELEM (V)),             \
  82      VUSE_VECT_ELEMENT_NC (V,X) = (N))
  83
  84 #define SET_VUSE_ELEMENT_VAR(V,X,N)                                     \
  85     (gcc_assert ((X) >= 0 && (X) < VUSE_VECT_NUM_ELEM (V)),             \
  86      VUSE_VECT_ELEMENT_NC ((V),(X)).use_var = (N))
  87
  88 #define SET_VUSE_ELEMENT_PTR(V,X,N)                                     \
  89     (gcc_assert ((X) >= 0 && (X) < VUSE_VECT_NUM_ELEM (V)),             \
  90      VUSE_ELEMENT_PTR_NC (V, X) = (N))
  91 #else
  92 #define VUSE_VECT_ELEMENT(V,X) VUSE_VECT_ELEMENT_NC(V,X)
  93 #define VUSE_ELEMENT_PTR(V,X) VUSE_ELEMENT_PTR_NC(V,X)
  94 #define SET_VUSE_VECT_ELEMENT(V,X,N) VUSE_VECT_ELEMENT_NC(V,X) = (N)
  95 #define SET_VUSE_ELEMENT_PTR(V,X,N) VUSE_ELEMENT_PTR_NC(V,X) = (N)
  96 #define SET_VUSE_ELEMENT_VAR(V,X,N) VUSE_VECT_ELEMENT_NC ((V),(X)).use_var = (N)
  97 #endif
  98
  99 #define VUSE_ELEMENT_VAR(V,X)   (VUSE_VECT_ELEMENT ((V),(X)).use_var)
 100
 101 /* This represents the virtual ops of a stmt.  */
 102 struct voptype_d
 103 {
 104   struct voptype_d *next;
 105   tree def_var;
 106   vuse_vec_t usev;
 107 };
 108 typedef struct voptype_d *voptype_p;
 109
 110 /* This structure represents a variable sized buffer which is allocated by the
 111    operand memory manager.  Operands are subalocated out of this block.  The
 112    MEM array varies in size.  */
 113
 114 struct ssa_operand_memory_d GTY((chain_next("%h.next")))
 115 {
 116   struct ssa_operand_memory_d *next;
 117   char mem[1];
 118 };
 119
 120 /* Number of different size free buckets for virtual operands.  */
 121 #define NUM_VOP_FREE_BUCKETS            29
 122
 123 /* Per-function operand caches.  */
 124 struct ssa_operands GTY(()) {
 125    struct ssa_operand_memory_d *operand_memory;
 126    unsigned operand_memory_index;
 127
 128    bool ops_active;
 129
 130    struct def_optype_d * GTY ((skip (""))) free_defs;
 131    struct use_optype_d * GTY ((skip (""))) free_uses;
 132    struct voptype_d * GTY ((skip (""))) vop_free_buckets[NUM_VOP_FREE_BUCKETS];
 133    VEC(tree,heap) * GTY ((skip (""))) mpt_table;
 134 };
 135
 136 /* This represents the operand cache for a stmt.  */
 137 struct stmt_operands_d
 138 {
 139   /* Statement operands.  */
 140   struct def_optype_d * def_ops;
 141   struct use_optype_d * use_ops;
 142
 143   /* Virtual operands (VDEF, VUSE).  */
 144   struct voptype_d * vdef_ops;
 145   struct voptype_d * vuse_ops;
 146
 147   /* Sets of memory symbols loaded and stored.  */
 148   bitmap stores;
 149   bitmap loads;
 150 };
 151
 152 typedef struct stmt_operands_d *stmt_operands_p;
 153
 154 #define USE_FROM_PTR(PTR)       get_use_from_ptr (PTR)
 155 #define DEF_FROM_PTR(PTR)       get_def_from_ptr (PTR)
 156 #define SET_USE(USE, V)         set_ssa_use_from_ptr (USE, V)
 157 #define SET_DEF(DEF, V)         ((*(DEF)) = (V))
 158
 159 #define USE_STMT(USE)           (USE)->stmt
 160
 161 #define DEF_OPS(STMT)           (stmt_ann (STMT)->operands.def_ops)
 162 #define USE_OPS(STMT)           (stmt_ann (STMT)->operands.use_ops)
 163 #define VUSE_OPS(STMT)          (stmt_ann (STMT)->operands.vuse_ops)
 164 #define VDEF_OPS(STMT)          (stmt_ann (STMT)->operands.vdef_ops)
 165
 166 #define LOADED_SYMS(STMT)       (stmt_ann (STMT)->operands.loads)
 167 #define STORED_SYMS(STMT)       (stmt_ann (STMT)->operands.stores)
 168
 169 #define USE_OP_PTR(OP)          (&((OP)->use_ptr))
 170 #define USE_OP(OP)              (USE_FROM_PTR (USE_OP_PTR (OP)))
 171
 172 #define DEF_OP_PTR(OP)          ((OP)->def_ptr)
 173 #define DEF_OP(OP)              (DEF_FROM_PTR (DEF_OP_PTR (OP)))
 174
 175 #define VUSE_OP_PTR(OP,X)       VUSE_ELEMENT_PTR ((OP)->usev, (X))
 176 #define VUSE_OP(OP,X)           VUSE_ELEMENT_VAR ((OP)->usev, (X))
 177 #define SET_VUSE_OP(OP,X,N)     SET_VUSE_ELEMENT_VAR ((OP)->usev, (X), (N))
 178 #define VUSE_NUM(OP)            VUSE_VECT_NUM_ELEM ((OP)->usev)
 179 #define VUSE_VECT(OP)           &((OP)->usev)
 180
 181 #define VDEF_RESULT_PTR(OP)     (&((OP)->def_var))
 182 #define VDEF_RESULT(OP)         ((OP)->def_var)
 183 #define VDEF_OP_PTR(OP,X)       VUSE_OP_PTR (OP, X)
 184 #define VDEF_OP(OP,X)           VUSE_OP (OP, X)
 185 #define SET_VDEF_OP(OP,X,N)     SET_VUSE_OP (OP, X, N)
 186 #define VDEF_NUM(OP)            VUSE_VECT_NUM_ELEM ((OP)->usev)
 187 #define VDEF_VECT(OP)           &((OP)->usev)
 188
 189 #define PHI_RESULT_PTR(PHI)     get_phi_result_ptr (PHI)
 190 #define PHI_RESULT(PHI)         DEF_FROM_PTR (PHI_RESULT_PTR (PHI))
 191 #define SET_PHI_RESULT(PHI, V)  SET_DEF (PHI_RESULT_PTR (PHI), (V))
 192
 193 #define PHI_ARG_DEF_PTR(PHI, I) get_phi_arg_def_ptr ((PHI), (I))
 194 #define PHI_ARG_DEF(PHI, I)     USE_FROM_PTR (PHI_ARG_DEF_PTR ((PHI), (I)))
 195 #define SET_PHI_ARG_DEF(PHI, I, V)                                      \
 196                                 SET_USE (PHI_ARG_DEF_PTR ((PHI), (I)), (V))
 197 #define PHI_ARG_DEF_FROM_EDGE(PHI, E)                                   \
 198                                 PHI_ARG_DEF ((PHI), (E)->dest_idx)
 199 #define PHI_ARG_DEF_PTR_FROM_EDGE(PHI, E)                               \
 200                                 PHI_ARG_DEF_PTR ((PHI), (E)->dest_idx)
 201 #define PHI_ARG_INDEX_FROM_USE(USE)   phi_arg_index_from_use (USE)
 202
 203
 204 extern struct voptype_d *realloc_vdef (struct voptype_d *, int);
 205 extern struct voptype_d *realloc_vuse (struct voptype_d *, int);
 206
 207 extern void init_ssa_operands (void);
 208 extern void fini_ssa_operands (void);
 209 extern void free_ssa_operands (stmt_operands_p);
 210 extern void update_stmt_operands (tree);
 211 extern bool verify_imm_links (FILE *f, tree var);
 212
 213 extern void copy_virtual_operands (tree, tree);
 214 extern void create_ssa_artificial_load_stmt (tree, tree);
 215
 216 extern void dump_immediate_uses (FILE *file);
 217 extern void dump_immediate_uses_for (FILE *file, tree var);
 218 extern void debug_immediate_uses (void);
 219 extern void debug_immediate_uses_for (tree var);
 220 extern void dump_decl_set (FILE *, bitmap);
 221 extern void debug_decl_set (bitmap);
 222
 223 extern bool ssa_operands_active (void);
 224
 225 extern void add_to_addressable_set (tree, bitmap *);
 226 extern void push_stmt_changes (tree *);
 227 extern void pop_stmt_changes (tree *);
 228 extern void discard_stmt_changes (tree *);
 229
 230 enum ssa_op_iter_type {
 231   ssa_op_iter_none = 0,
 232   ssa_op_iter_tree,
 233   ssa_op_iter_use,
 234   ssa_op_iter_def,
 235   ssa_op_iter_vdef
 236 };
 237
 238 /* This structure is used in the operand iterator loops.  It contains the
 239    items required to determine which operand is retrieved next.  During
 240    optimization, this structure is scalarized, and any unused fields are
 241    optimized away, resulting in little overhead.  */
 242
 243 typedef struct ssa_operand_iterator_d
 244 {
 245   def_optype_p defs;
 246   use_optype_p uses;
 247   voptype_p vuses;
 248   voptype_p vdefs;
 249   voptype_p mayuses;
 250   enum ssa_op_iter_type iter_type;
 251   int phi_i;
 252   int num_phi;
 253   tree phi_stmt;
 254   bool done;
 255   int vuse_index;
 256   int mayuse_index;
 257 } ssa_op_iter;
 258
 259 /* These flags are used to determine which operands are returned during
 260    execution of the loop.  */
 261 #define SSA_OP_USE              0x01    /* Real USE operands.  */
 262 #define SSA_OP_DEF              0x02    /* Real DEF operands.  */
 263 #define SSA_OP_VUSE             0x04    /* VUSE operands.  */
 264 #define SSA_OP_VMAYUSE          0x08    /* USE portion of VDEFS.  */
 265 #define SSA_OP_VDEF             0x10    /* DEF portion of VDEFS.  */
 266
 267 /* These are commonly grouped operand flags.  */
 268 #define SSA_OP_VIRTUAL_USES     (SSA_OP_VUSE | SSA_OP_VMAYUSE)
 269 #define SSA_OP_VIRTUAL_DEFS     (SSA_OP_VDEF)
 270 #define SSA_OP_ALL_VIRTUALS     (SSA_OP_VIRTUAL_USES | SSA_OP_VIRTUAL_DEFS)
 271 #define SSA_OP_ALL_USES         (SSA_OP_VIRTUAL_USES | SSA_OP_USE)
 272 #define SSA_OP_ALL_DEFS         (SSA_OP_VIRTUAL_DEFS | SSA_OP_DEF)
 273 #define SSA_OP_ALL_OPERANDS     (SSA_OP_ALL_USES | SSA_OP_ALL_DEFS)
 274
 275 /* This macro executes a loop over the operands of STMT specified in FLAG,
 276    returning each operand as a 'tree' in the variable TREEVAR.  ITER is an
 277    ssa_op_iter structure used to control the loop.  */
 278 #define FOR_EACH_SSA_TREE_OPERAND(TREEVAR, STMT, ITER, FLAGS)   \
 279   for (TREEVAR = op_iter_init_tree (&(ITER), STMT, FLAGS);      \
 280        !op_iter_done (&(ITER));                                 \
 281        TREEVAR = op_iter_next_tree (&(ITER)))
 282
 283 /* This macro executes a loop over the operands of STMT specified in FLAG,
 284    returning each operand as a 'use_operand_p' in the variable USEVAR.
 285    ITER is an ssa_op_iter structure used to control the loop.  */
 286 #define FOR_EACH_SSA_USE_OPERAND(USEVAR, STMT, ITER, FLAGS)     \
 287   for (USEVAR = op_iter_init_use (&(ITER), STMT, FLAGS);        \
 288        !op_iter_done (&(ITER));                                 \
 289        USEVAR = op_iter_next_use (&(ITER)))
 290
 291 /* This macro executes a loop over the operands of STMT specified in FLAG,
 292    returning each operand as a 'def_operand_p' in the variable DEFVAR.
 293    ITER is an ssa_op_iter structure used to control the loop.  */
 294 #define FOR_EACH_SSA_DEF_OPERAND(DEFVAR, STMT, ITER, FLAGS)     \
 295   for (DEFVAR = op_iter_init_def (&(ITER), STMT, FLAGS);        \
 296        !op_iter_done (&(ITER));                                 \
 297        DEFVAR = op_iter_next_def (&(ITER)))
 298
 299 /* This macro executes a loop over the VDEF operands of STMT.  The def
 300    and use for each VDEF is returned in DEFVAR and USEVAR.
 301    ITER is an ssa_op_iter structure used to control the loop.  */
 302 #define FOR_EACH_SSA_VDEF_OPERAND(DEFVAR, USEVAR, STMT, ITER)   \
 303   for (op_iter_init_vdef (&(ITER), STMT, &(USEVAR), &(DEFVAR)); \
 304        !op_iter_done (&(ITER));                                 \
 305        op_iter_next_vdef (&(USEVAR), &(DEFVAR), &(ITER)))
 306
 307 /* This macro will execute a loop over all the arguments of a PHI which
 308    match FLAGS.   A use_operand_p is always returned via USEVAR.  FLAGS
 309    can be either SSA_OP_USE or SSA_OP_VIRTUAL_USES or SSA_OP_ALL_USES.  */
 310 #define FOR_EACH_PHI_ARG(USEVAR, STMT, ITER, FLAGS)             \
 311   for ((USEVAR) = op_iter_init_phiuse (&(ITER), STMT, FLAGS);   \
 312        !op_iter_done (&(ITER));                                 \
 313        (USEVAR) = op_iter_next_use (&(ITER)))
 314
 315
 316 /* This macro will execute a loop over a stmt, regardless of whether it is
 317    a real stmt or a PHI node, looking at the USE nodes matching FLAGS.  */
 318 #define FOR_EACH_PHI_OR_STMT_USE(USEVAR, STMT, ITER, FLAGS)     \
 319   for ((USEVAR) = (TREE_CODE (STMT) == PHI_NODE                 \
 320                    ? op_iter_init_phiuse (&(ITER), STMT, FLAGS) \
 321                    : op_iter_init_use (&(ITER), STMT, FLAGS));  \
 322        !op_iter_done (&(ITER));                                 \
 323        (USEVAR) = op_iter_next_use (&(ITER)))
 324
 325 /* This macro will execute a loop over a stmt, regardless of whether it is
 326    a real stmt or a PHI node, looking at the DEF nodes matching FLAGS.  */
 327 #define FOR_EACH_PHI_OR_STMT_DEF(DEFVAR, STMT, ITER, FLAGS)     \
 328   for ((DEFVAR) = (TREE_CODE (STMT) == PHI_NODE                 \
 329                    ? op_iter_init_phidef (&(ITER), STMT, FLAGS) \
 330                    : op_iter_init_def (&(ITER), STMT, FLAGS));  \
 331        !op_iter_done (&(ITER));                                 \
 332        (DEFVAR) = op_iter_next_def (&(ITER)))
 333
 334 /* This macro returns an operand in STMT as a tree if it is the ONLY
 335    operand matching FLAGS.  If there are 0 or more than 1 operand matching
 336    FLAGS, then NULL_TREE is returned.  */
 337 #define SINGLE_SSA_TREE_OPERAND(STMT, FLAGS)                    \
 338   single_ssa_tree_operand (STMT, FLAGS)
 339
 340 /* This macro returns an operand in STMT as a use_operand_p if it is the ONLY
 341    operand matching FLAGS.  If there are 0 or more than 1 operand matching
 342    FLAGS, then NULL_USE_OPERAND_P is returned.  */
 343 #define SINGLE_SSA_USE_OPERAND(STMT, FLAGS)                     \
 344   single_ssa_use_operand (STMT, FLAGS)
 345
 346 /* This macro returns an operand in STMT as a def_operand_p if it is the ONLY
 347    operand matching FLAGS.  If there are 0 or more than 1 operand matching
 348    FLAGS, then NULL_DEF_OPERAND_P is returned.  */
 349 #define SINGLE_SSA_DEF_OPERAND(STMT, FLAGS)                     \
 350   single_ssa_def_operand (STMT, FLAGS)
 351
 352 /* This macro returns TRUE if there are no operands matching FLAGS in STMT.  */
 353 #define ZERO_SSA_OPERANDS(STMT, FLAGS)  zero_ssa_operands (STMT, FLAGS)
 354
 355 /* This macro counts the number of operands in STMT matching FLAGS.  */
 356 #define NUM_SSA_OPERANDS(STMT, FLAGS)   num_ssa_operands (STMT, FLAGS)
 357
 358 extern tree get_mpt_for (tree);
 359 extern void dump_memory_partitions (FILE *);
 360 extern void debug_memory_partitions (void);
 361
 362 #endif  /* GCC_TREE_SSA_OPERANDS_H  */