gcc/tree-ssa-operands.h

   1 /* SSA operand management for trees.
   2    Copyright (C) 2003, 2005, 2006, 2007, 2008, 2010
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  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              ((use_operand_p)NULL)
  35 #define NULL_DEF_OPERAND_P              ((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 structure represents a variable sized buffer which is allocated by the
  54    operand memory manager.  Operands are suballocated out of this block.  The
  55    MEM array varies in size.  */
  56
  57 struct GTY((chain_next("%h.next"), variable_size)) ssa_operand_memory_d {
  58   struct ssa_operand_memory_d *next;
  59   char mem[1];
  60 };
  61
  62 /* Per-function operand caches.  */
  63 struct GTY(()) ssa_operands {
  64    struct ssa_operand_memory_d *operand_memory;
  65    unsigned operand_memory_index;
  66    /* Current size of the operand memory buffer.  */
  67    unsigned int ssa_operand_mem_size;
  68
  69    bool ops_active;
  70
  71    struct def_optype_d * GTY ((skip (""))) free_defs;
  72    struct use_optype_d * GTY ((skip (""))) free_uses;
  73 };
  74
  75 #define USE_FROM_PTR(PTR)       get_use_from_ptr (PTR)
  76 #define DEF_FROM_PTR(PTR)       get_def_from_ptr (PTR)
  77 #define SET_USE(USE, V)         set_ssa_use_from_ptr (USE, V)
  78 #define SET_DEF(DEF, V)         ((*(DEF)) = (V))
  79
  80 #define USE_STMT(USE)           (USE)->loc.stmt
  81
  82 #define USE_OP_PTR(OP)          (&((OP)->use_ptr))
  83 #define USE_OP(OP)              (USE_FROM_PTR (USE_OP_PTR (OP)))
  84
  85 #define DEF_OP_PTR(OP)          ((OP)->def_ptr)
  86 #define DEF_OP(OP)              (DEF_FROM_PTR (DEF_OP_PTR (OP)))
  87
  88 #define PHI_RESULT_PTR(PHI)     gimple_phi_result_ptr (PHI)
  89 #define PHI_RESULT(PHI)         DEF_FROM_PTR (PHI_RESULT_PTR (PHI))
  90 #define SET_PHI_RESULT(PHI, V)  SET_DEF (PHI_RESULT_PTR (PHI), (V))
  91
  92 #define PHI_ARG_DEF_PTR(PHI, I) gimple_phi_arg_imm_use_ptr ((PHI), (I))
  93 #define PHI_ARG_DEF(PHI, I)     USE_FROM_PTR (PHI_ARG_DEF_PTR ((PHI), (I)))
  94 #define SET_PHI_ARG_DEF(PHI, I, V)                                      \
  95                                 SET_USE (PHI_ARG_DEF_PTR ((PHI), (I)), (V))
  96 #define PHI_ARG_DEF_FROM_EDGE(PHI, E)                                   \
  97                                 PHI_ARG_DEF ((PHI), (E)->dest_idx)
  98 #define PHI_ARG_DEF_PTR_FROM_EDGE(PHI, E)                               \
  99                                 PHI_ARG_DEF_PTR ((PHI), (E)->dest_idx)
 100 #define PHI_ARG_INDEX_FROM_USE(USE)   phi_arg_index_from_use (USE)
 101
 102
 103 extern void init_ssa_operands (void);
 104 extern void fini_ssa_operands (void);
 105 extern void update_stmt_operands (gimple);
 106 extern void free_stmt_operands (gimple);
 107 extern bool verify_imm_links (FILE *f, tree var);
 108
 109 extern void dump_immediate_uses (FILE *file);
 110 extern void dump_immediate_uses_for (FILE *file, tree var);
 111 extern void debug_immediate_uses (void);
 112 extern void debug_immediate_uses_for (tree var);
 113 extern void dump_decl_set (FILE *, bitmap);
 114 extern void debug_decl_set (bitmap);
 115
 116 extern bool ssa_operands_active (void);
 117
 118 extern void unlink_stmt_vdef (gimple);
 119
 120 enum ssa_op_iter_type {
 121   ssa_op_iter_none = 0,
 122   ssa_op_iter_tree,
 123   ssa_op_iter_use,
 124   ssa_op_iter_def
 125 };
 126
 127 /* This structure is used in the operand iterator loops.  It contains the
 128    items required to determine which operand is retrieved next.  During
 129    optimization, this structure is scalarized, and any unused fields are
 130    optimized away, resulting in little overhead.  */
 131
 132 typedef struct ssa_operand_iterator_d
 133 {
 134   bool done;
 135   enum ssa_op_iter_type iter_type;
 136   def_optype_p defs;
 137   use_optype_p uses;
 138   int phi_i;
 139   int num_phi;
 140   gimple phi_stmt;
 141 } ssa_op_iter;
 142
 143 /* These flags are used to determine which operands are returned during
 144    execution of the loop.  */
 145 #define SSA_OP_USE              0x01    /* Real USE operands.  */
 146 #define SSA_OP_DEF              0x02    /* Real DEF operands.  */
 147 #define SSA_OP_VUSE             0x04    /* VUSE operands.  */
 148 #define SSA_OP_VDEF             0x08    /* VDEF operands.  */
 149
 150 /* These are commonly grouped operand flags.  */
 151 #define SSA_OP_VIRTUAL_USES     (SSA_OP_VUSE)
 152 #define SSA_OP_VIRTUAL_DEFS     (SSA_OP_VDEF)
 153 #define SSA_OP_ALL_VIRTUALS     (SSA_OP_VIRTUAL_USES | SSA_OP_VIRTUAL_DEFS)
 154 #define SSA_OP_ALL_USES         (SSA_OP_VIRTUAL_USES | SSA_OP_USE)
 155 #define SSA_OP_ALL_DEFS         (SSA_OP_VIRTUAL_DEFS | SSA_OP_DEF)
 156 #define SSA_OP_ALL_OPERANDS     (SSA_OP_ALL_USES | SSA_OP_ALL_DEFS)
 157
 158 /* This macro executes a loop over the operands of STMT specified in FLAG,
 159    returning each operand as a 'tree' in the variable TREEVAR.  ITER is an
 160    ssa_op_iter structure used to control the loop.  */
 161 #define FOR_EACH_SSA_TREE_OPERAND(TREEVAR, STMT, ITER, FLAGS)   \
 162   for (TREEVAR = op_iter_init_tree (&(ITER), STMT, FLAGS);      \
 163        !op_iter_done (&(ITER));                                 \
 164        (void) (TREEVAR = op_iter_next_tree (&(ITER))))
 165
 166 /* This macro executes a loop over the operands of STMT specified in FLAG,
 167    returning each operand as a 'use_operand_p' in the variable USEVAR.
 168    ITER is an ssa_op_iter structure used to control the loop.  */
 169 #define FOR_EACH_SSA_USE_OPERAND(USEVAR, STMT, ITER, FLAGS)     \
 170   for (USEVAR = op_iter_init_use (&(ITER), STMT, FLAGS);        \
 171        !op_iter_done (&(ITER));                                 \
 172        USEVAR = op_iter_next_use (&(ITER)))
 173
 174 /* This macro executes a loop over the operands of STMT specified in FLAG,
 175    returning each operand as a 'def_operand_p' in the variable DEFVAR.
 176    ITER is an ssa_op_iter structure used to control the loop.  */
 177 #define FOR_EACH_SSA_DEF_OPERAND(DEFVAR, STMT, ITER, FLAGS)     \
 178   for (DEFVAR = op_iter_init_def (&(ITER), STMT, FLAGS);        \
 179        !op_iter_done (&(ITER));                                 \
 180        DEFVAR = op_iter_next_def (&(ITER)))
 181
 182 /* This macro will execute a loop over all the arguments of a PHI which
 183    match FLAGS.   A use_operand_p is always returned via USEVAR.  FLAGS
 184    can be either SSA_OP_USE or SSA_OP_VIRTUAL_USES or SSA_OP_ALL_USES.  */
 185 #define FOR_EACH_PHI_ARG(USEVAR, STMT, ITER, FLAGS)             \
 186   for ((USEVAR) = op_iter_init_phiuse (&(ITER), STMT, FLAGS);   \
 187        !op_iter_done (&(ITER));                                 \
 188        (USEVAR) = op_iter_next_use (&(ITER)))
 189
 190
 191 /* This macro will execute a loop over a stmt, regardless of whether it is
 192    a real stmt or a PHI node, looking at the USE nodes matching FLAGS.  */
 193 #define FOR_EACH_PHI_OR_STMT_USE(USEVAR, STMT, ITER, FLAGS)     \
 194   for ((USEVAR) = (gimple_code (STMT) == GIMPLE_PHI             \
 195                    ? op_iter_init_phiuse (&(ITER), STMT, FLAGS) \
 196                    : op_iter_init_use (&(ITER), STMT, FLAGS));  \
 197        !op_iter_done (&(ITER));                                 \
 198        (USEVAR) = op_iter_next_use (&(ITER)))
 199
 200 /* This macro will execute a loop over a stmt, regardless of whether it is
 201    a real stmt or a PHI node, looking at the DEF nodes matching FLAGS.  */
 202 #define FOR_EACH_PHI_OR_STMT_DEF(DEFVAR, STMT, ITER, FLAGS)     \
 203   for ((DEFVAR) = (gimple_code (STMT) == GIMPLE_PHI             \
 204                    ? op_iter_init_phidef (&(ITER), STMT, FLAGS) \
 205                    : op_iter_init_def (&(ITER), STMT, FLAGS));  \
 206        !op_iter_done (&(ITER));                                 \
 207        (DEFVAR) = op_iter_next_def (&(ITER)))
 208
 209 /* This macro returns an operand in STMT as a tree if it is the ONLY
 210    operand matching FLAGS.  If there are 0 or more than 1 operand matching
 211    FLAGS, then NULL_TREE is returned.  */
 212 #define SINGLE_SSA_TREE_OPERAND(STMT, FLAGS)                    \
 213   single_ssa_tree_operand (STMT, FLAGS)
 214
 215 /* This macro returns an operand in STMT as a use_operand_p if it is the ONLY
 216    operand matching FLAGS.  If there are 0 or more than 1 operand matching
 217    FLAGS, then NULL_USE_OPERAND_P is returned.  */
 218 #define SINGLE_SSA_USE_OPERAND(STMT, FLAGS)                     \
 219   single_ssa_use_operand (STMT, FLAGS)
 220
 221 /* This macro returns an operand in STMT as a def_operand_p if it is the ONLY
 222    operand matching FLAGS.  If there are 0 or more than 1 operand matching
 223    FLAGS, then NULL_DEF_OPERAND_P is returned.  */
 224 #define SINGLE_SSA_DEF_OPERAND(STMT, FLAGS)                     \
 225   single_ssa_def_operand (STMT, FLAGS)
 226
 227 /* This macro returns TRUE if there are no operands matching FLAGS in STMT.  */
 228 #define ZERO_SSA_OPERANDS(STMT, FLAGS)  zero_ssa_operands (STMT, FLAGS)
 229
 230 /* This macro counts the number of operands in STMT matching FLAGS.  */
 231 #define NUM_SSA_OPERANDS(STMT, FLAGS)   num_ssa_operands (STMT, FLAGS)
 232
 233 #endif  /* GCC_TREE_SSA_OPERANDS_H  */