gcc/tree-ssa-operands.h

   1 /* SSA operand management for trees.
   2    Copyright (C) 2003, 2005, 2006, 2007, 2008 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 3, 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 COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef GCC_TREE_SSA_OPERANDS_H
  21 #define GCC_TREE_SSA_OPERANDS_H
  22
  23 /* Interface to SSA operands.  */
  24
  25
  26 /* This represents a pointer to a DEF operand.  */
  27 typedef tree *def_operand_p;
  28
  29 /* This represents a pointer to a USE operand.  */
  30 typedef ssa_use_operand_t *use_operand_p;
  31
  32 /* NULL operand types.  */
  33 #define NULL_USE_OPERAND_P              ((use_operand_p)NULL)
  34 #define NULL_DEF_OPERAND_P              ((def_operand_p)NULL)
  35
  36 /* This represents the DEF operands of a stmt.  */
  37 struct def_optype_d
  38 {
  39   struct def_optype_d *next;
  40   tree *def_ptr;
  41 };
  42 typedef struct def_optype_d *def_optype_p;
  43
  44 /* This represents the USE operands of a stmt.  */
  45 struct use_optype_d
  46 {
  47   struct use_optype_d *next;
  48   struct ssa_use_operand_d use_ptr;
  49 };
  50 typedef struct use_optype_d *use_optype_p;
  51
  52 /* This structure represents a variable sized buffer which is allocated by the
  53    operand memory manager.  Operands are suballocated out of this block.  The
  54    MEM array varies in size.  */
  55
  56 struct GTY((chain_next("%h.next"))) ssa_operand_memory_d {
  57   struct ssa_operand_memory_d *next;
  58   char mem[1];
  59 };
  60
  61 /* Per-function operand caches.  */
  62 struct GTY(()) ssa_operands {
  63    struct ssa_operand_memory_d *operand_memory;
  64    unsigned operand_memory_index;
  65    /* Current size of the operand memory buffer.  */
  66    unsigned int ssa_operand_mem_size;
  67
  68    bool ops_active;
  69
  70    struct def_optype_d * GTY ((skip (""))) free_defs;
  71    struct use_optype_d * GTY ((skip (""))) free_uses;
  72 };
  73
  74 #define USE_FROM_PTR(PTR)       get_use_from_ptr (PTR)
  75 #define DEF_FROM_PTR(PTR)       get_def_from_ptr (PTR)
  76 #define SET_USE(USE, V)         set_ssa_use_from_ptr (USE, V)
  77 #define SET_DEF(DEF, V)         ((*(DEF)) = (V))
  78
  79 #define USE_STMT(USE)           (USE)->loc.stmt
  80
  81 #define USE_OP_PTR(OP)          (&((OP)->use_ptr))
  82 #define USE_OP(OP)              (USE_FROM_PTR (USE_OP_PTR (OP)))
  83
  84 #define DEF_OP_PTR(OP)          ((OP)->def_ptr)
  85 #define DEF_OP(OP)              (DEF_FROM_PTR (DEF_OP_PTR (OP)))
  86
  87 #define PHI_RESULT_PTR(PHI)     gimple_phi_result_ptr (PHI)
  88 #define PHI_RESULT(PHI)         DEF_FROM_PTR (PHI_RESULT_PTR (PHI))
  89 #define SET_PHI_RESULT(PHI, V)  SET_DEF (PHI_RESULT_PTR (PHI), (V))
  90
  91 #define PHI_ARG_DEF_PTR(PHI, I) gimple_phi_arg_imm_use_ptr ((PHI), (I))
  92 #define PHI_ARG_DEF(PHI, I)     USE_FROM_PTR (PHI_ARG_DEF_PTR ((PHI), (I)))
  93 #define SET_PHI_ARG_DEF(PHI, I, V)                                      \
  94                                 SET_USE (PHI_ARG_DEF_PTR ((PHI), (I)), (V))
  95 #define PHI_ARG_DEF_FROM_EDGE(PHI, E)                                   \
  96                                 PHI_ARG_DEF ((PHI), (E)->dest_idx)
  97 #define PHI_ARG_DEF_PTR_FROM_EDGE(PHI, E)                               \
  98                                 PHI_ARG_DEF_PTR ((PHI), (E)->dest_idx)
  99 #define PHI_ARG_INDEX_FROM_USE(USE)   phi_arg_index_from_use (USE)
 100
 101
 102 extern void init_ssa_operands (void);
 103 extern void fini_ssa_operands (void);
 104 extern void update_stmt_operands (gimple);
 105 extern void free_stmt_operands (gimple);
 106 extern bool verify_imm_links (FILE *f, tree var);
 107
 108 extern void dump_immediate_uses (FILE *file);
 109 extern void dump_immediate_uses_for (FILE *file, tree var);
 110 extern void debug_immediate_uses (void);
 111 extern void debug_immediate_uses_for (tree var);
 112 extern void dump_decl_set (FILE *, bitmap);
 113 extern void debug_decl_set (bitmap);
 114
 115 extern bool ssa_operands_active (void);
 116
 117 extern void unlink_stmt_vdef (gimple);
 118
 119 enum ssa_op_iter_type {
 120   ssa_op_iter_none = 0,
 121   ssa_op_iter_tree,
 122   ssa_op_iter_use,
 123   ssa_op_iter_def
 124 };
 125
 126 /* This structure is used in the operand iterator loops.  It contains the
 127    items required to determine which operand is retrieved next.  During
 128    optimization, this structure is scalarized, and any unused fields are
 129    optimized away, resulting in little overhead.  */
 130
 131 typedef struct ssa_operand_iterator_d
 132 {
 133   bool done;
 134   enum ssa_op_iter_type iter_type;
 135   def_optype_p defs;
 136   use_optype_p uses;
 137   int phi_i;
 138   int num_phi;
 139   gimple phi_stmt;
 140 } ssa_op_iter;
 141
 142 /* These flags are used to determine which operands are returned during
 143    execution of the loop.  */
 144 #define SSA_OP_USE              0x01    /* Real USE operands.  */
 145 #define SSA_OP_DEF              0x02    /* Real DEF operands.  */
 146 #define SSA_OP_VUSE             0x04    /* VUSE operands.  */
 147 #define SSA_OP_VDEF             0x08    /* VDEF operands.  */
 148
 149 /* These are commonly grouped operand flags.  */
 150 #define SSA_OP_VIRTUAL_USES     (SSA_OP_VUSE)
 151 #define SSA_OP_VIRTUAL_DEFS     (SSA_OP_VDEF)
 152 #define SSA_OP_ALL_VIRTUALS     (SSA_OP_VIRTUAL_USES | SSA_OP_VIRTUAL_DEFS)
 153 #define SSA_OP_ALL_USES         (SSA_OP_VIRTUAL_USES | SSA_OP_USE)
 154 #define SSA_OP_ALL_DEFS         (SSA_OP_VIRTUAL_DEFS | SSA_OP_DEF)
 155 #define SSA_OP_ALL_OPERANDS     (SSA_OP_ALL_USES | SSA_OP_ALL_DEFS)
 156
 157 /* This macro executes a loop over the operands of STMT specified in FLAG,
 158    returning each operand as a 'tree' in the variable TREEVAR.  ITER is an
 159    ssa_op_iter structure used to control the loop.  */
 160 #define FOR_EACH_SSA_TREE_OPERAND(TREEVAR, STMT, ITER, FLAGS)   \
 161   for (TREEVAR = op_iter_init_tree (&(ITER), STMT, FLAGS);      \
 162        !op_iter_done (&(ITER));                                 \
 163        TREEVAR = op_iter_next_tree (&(ITER)))
 164
 165 /* This macro executes a loop over the operands of STMT specified in FLAG,
 166    returning each operand as a 'use_operand_p' in the variable USEVAR.
 167    ITER is an ssa_op_iter structure used to control the loop.  */
 168 #define FOR_EACH_SSA_USE_OPERAND(USEVAR, STMT, ITER, FLAGS)     \
 169   for (USEVAR = op_iter_init_use (&(ITER), STMT, FLAGS);        \
 170        !op_iter_done (&(ITER));                                 \
 171        USEVAR = op_iter_next_use (&(ITER)))
 172
 173 /* This macro executes a loop over the operands of STMT specified in FLAG,
 174    returning each operand as a 'def_operand_p' in the variable DEFVAR.
 175    ITER is an ssa_op_iter structure used to control the loop.  */
 176 #define FOR_EACH_SSA_DEF_OPERAND(DEFVAR, STMT, ITER, FLAGS)     \
 177   for (DEFVAR = op_iter_init_def (&(ITER), STMT, FLAGS);        \
 178        !op_iter_done (&(ITER));                                 \
 179        DEFVAR = op_iter_next_def (&(ITER)))
 180
 181 /* This macro will execute a loop over all the arguments of a PHI which
 182    match FLAGS.   A use_operand_p is always returned via USEVAR.  FLAGS
 183    can be either SSA_OP_USE or SSA_OP_VIRTUAL_USES or SSA_OP_ALL_USES.  */
 184 #define FOR_EACH_PHI_ARG(USEVAR, STMT, ITER, FLAGS)             \
 185   for ((USEVAR) = op_iter_init_phiuse (&(ITER), STMT, FLAGS);   \
 186        !op_iter_done (&(ITER));                                 \
 187        (USEVAR) = op_iter_next_use (&(ITER)))
 188
 189
 190 /* This macro will execute a loop over a stmt, regardless of whether it is
 191    a real stmt or a PHI node, looking at the USE nodes matching FLAGS.  */
 192 #define FOR_EACH_PHI_OR_STMT_USE(USEVAR, STMT, ITER, FLAGS)     \
 193   for ((USEVAR) = (gimple_code (STMT) == GIMPLE_PHI             \
 194                    ? op_iter_init_phiuse (&(ITER), STMT, FLAGS) \
 195                    : op_iter_init_use (&(ITER), STMT, FLAGS));  \
 196        !op_iter_done (&(ITER));                                 \
 197        (USEVAR) = op_iter_next_use (&(ITER)))
 198
 199 /* This macro will execute a loop over a stmt, regardless of whether it is
 200    a real stmt or a PHI node, looking at the DEF nodes matching FLAGS.  */
 201 #define FOR_EACH_PHI_OR_STMT_DEF(DEFVAR, STMT, ITER, FLAGS)     \
 202   for ((DEFVAR) = (gimple_code (STMT) == GIMPLE_PHI             \
 203                    ? op_iter_init_phidef (&(ITER), STMT, FLAGS) \
 204                    : op_iter_init_def (&(ITER), STMT, FLAGS));  \
 205        !op_iter_done (&(ITER));                                 \
 206        (DEFVAR) = op_iter_next_def (&(ITER)))
 207
 208 /* This macro returns an operand in STMT as a tree if it is the ONLY
 209    operand matching FLAGS.  If there are 0 or more than 1 operand matching
 210    FLAGS, then NULL_TREE is returned.  */
 211 #define SINGLE_SSA_TREE_OPERAND(STMT, FLAGS)                    \
 212   single_ssa_tree_operand (STMT, FLAGS)
 213
 214 /* This macro returns an operand in STMT as a use_operand_p if it is the ONLY
 215    operand matching FLAGS.  If there are 0 or more than 1 operand matching
 216    FLAGS, then NULL_USE_OPERAND_P is returned.  */
 217 #define SINGLE_SSA_USE_OPERAND(STMT, FLAGS)                     \
 218   single_ssa_use_operand (STMT, FLAGS)
 219
 220 /* This macro returns an operand in STMT as a def_operand_p if it is the ONLY
 221    operand matching FLAGS.  If there are 0 or more than 1 operand matching
 222    FLAGS, then NULL_DEF_OPERAND_P is returned.  */
 223 #define SINGLE_SSA_DEF_OPERAND(STMT, FLAGS)                     \
 224   single_ssa_def_operand (STMT, FLAGS)
 225
 226 /* This macro returns TRUE if there are no operands matching FLAGS in STMT.  */
 227 #define ZERO_SSA_OPERANDS(STMT, FLAGS)  zero_ssa_operands (STMT, FLAGS)
 228
 229 /* This macro counts the number of operands in STMT matching FLAGS.  */
 230 #define NUM_SSA_OPERANDS(STMT, FLAGS)   num_ssa_operands (STMT, FLAGS)
 231
 232 #endif  /* GCC_TREE_SSA_OPERANDS_H  */