gcc/tree-ssanames.h

   1 /* SSA name expresssons routines
   2    Copyright (C) 2013-2016 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_SSANAMES_H
  21 #define GCC_TREE_SSANAMES_H
  22
  23 /* Aliasing information for SSA_NAMEs representing pointer variables.  */
  24
  25 struct GTY(()) ptr_info_def
  26 {
  27   /* The points-to solution.  */
  28   struct pt_solution pt;
  29
  30   /* Alignment and misalignment of the pointer in bytes.  Together
  31      align and misalign specify low known bits of the pointer.
  32      ptr & (align - 1) == misalign.  */
  33
  34   /* When known, this is the power-of-two byte alignment of the object this
  35      pointer points into.  This is usually DECL_ALIGN_UNIT for decls and
  36      MALLOC_ABI_ALIGNMENT for allocated storage.  When the alignment is not
  37      known, it is zero.  Do not access directly but use functions
  38      get_ptr_info_alignment, set_ptr_info_alignment,
  39      mark_ptr_info_alignment_unknown and similar.  */
  40   unsigned int align;
  41
  42   /* When alignment is known, the byte offset this pointer differs from the
  43      above alignment.  Access only through the same helper functions as align
  44      above.  */
  45   unsigned int misalign;
  46 };
  47
  48 /* Value range information for SSA_NAMEs representing non-pointer variables.  */
  49
  50 struct GTY ((variable_size)) range_info_def {
  51   /* Minimum, maximum and nonzero bits.  */
  52   TRAILING_WIDE_INT_ACCESSOR (min, ints, 0)
  53   TRAILING_WIDE_INT_ACCESSOR (max, ints, 1)
  54   TRAILING_WIDE_INT_ACCESSOR (nonzero_bits, ints, 2)
  55   trailing_wide_ints <3> ints;
  56 };
  57
  58
  59 #define SSANAMES(fun) (fun)->gimple_df->ssa_names
  60 #define DEFAULT_DEFS(fun) (fun)->gimple_df->default_defs
  61
  62 #define num_ssa_names (vec_safe_length (cfun->gimple_df->ssa_names))
  63 #define ssa_name(i) ((*cfun->gimple_df->ssa_names)[(i)])
  64
  65
  66 /* Type of value ranges.  See value_range_d In tree-vrp.c for a
  67    description of these types.  */
  68 enum value_range_type { VR_UNDEFINED, VR_RANGE, VR_ANTI_RANGE, VR_VARYING };
  69
  70 /* Sets the value range to SSA.  */
  71 extern void set_range_info (tree, enum value_range_type, const wide_int_ref &,
  72                             const wide_int_ref &);
  73 /* Gets the value range from SSA.  */
  74 extern enum value_range_type get_range_info (const_tree, wide_int *,
  75                                              wide_int *);
  76 extern void set_nonzero_bits (tree, const wide_int_ref &);
  77 extern wide_int get_nonzero_bits (const_tree);
  78 extern void init_ssanames (struct function *, int);
  79 extern void fini_ssanames (struct function *);
  80 extern void ssanames_print_statistics (void);
  81 extern tree make_ssa_name_fn (struct function *, tree, gimple *);
  82 extern void release_ssa_name_fn (struct function *, tree);
  83 extern bool get_ptr_info_alignment (struct ptr_info_def *, unsigned int *,
  84                                     unsigned int *);
  85 extern void mark_ptr_info_alignment_unknown (struct ptr_info_def *);
  86 extern void set_ptr_info_alignment (struct ptr_info_def *, unsigned int,
  87                                     unsigned int);
  88 extern void adjust_ptr_info_misalignment (struct ptr_info_def *,
  89                                           unsigned int);
  90 extern struct ptr_info_def *get_ptr_info (tree);
  91
  92 extern tree copy_ssa_name_fn (struct function *, tree, gimple *);
  93 extern void duplicate_ssa_name_ptr_info (tree, struct ptr_info_def *);
  94 extern tree duplicate_ssa_name_fn (struct function *, tree, gimple *);
  95 extern void duplicate_ssa_name_range_info (tree, enum value_range_type,
  96                                            struct range_info_def *);
  97 extern void reset_flow_sensitive_info (tree);
  98 extern void reset_flow_sensitive_info_in_bb (basic_block);
  99 extern void release_defs (gimple *);
 100 extern void replace_ssa_name_symbol (tree, tree);
 101 extern void flush_ssaname_freelist (void);
 102
 103
 104 /* Return an SSA_NAME node for variable VAR defined in statement STMT
 105    in function cfun.  */
 106
 107 static inline tree
 108 make_ssa_name (tree var, gimple *stmt = NULL)
 109 {
 110   return make_ssa_name_fn (cfun, var, stmt);
 111 }
 112
 113 /* Return an SSA_NAME node using the template SSA name NAME defined in
 114    statement STMT in function cfun.  */
 115
 116 static inline tree
 117 copy_ssa_name (tree var, gimple *stmt = NULL)
 118 {
 119   return copy_ssa_name_fn (cfun, var, stmt);
 120 }
 121
 122 /*  Creates a duplicate of a SSA name NAME tobe defined by statement STMT
 123     in function cfun.  */
 124
 125 static inline tree
 126 duplicate_ssa_name (tree var, gimple *stmt)
 127 {
 128   return duplicate_ssa_name_fn (cfun, var, stmt);
 129 }
 130
 131 /* Release the SSA name NAME used in function cfun.  */
 132
 133 static inline void
 134 release_ssa_name (tree name)
 135 {
 136   release_ssa_name_fn (cfun, name);
 137 }
 138
 139 /* Return an anonymous SSA_NAME node for type TYPE defined in statement STMT
 140    in function cfun.  Arrange so that it uses NAME in dumps.  */
 141
 142 static inline tree
 143 make_temp_ssa_name (tree type, gimple *stmt, const char *name)
 144 {
 145   tree ssa_name;
 146   gcc_checking_assert (TYPE_P (type));
 147   ssa_name = make_ssa_name_fn (cfun, type, stmt);
 148   SET_SSA_NAME_VAR_OR_IDENTIFIER (ssa_name, get_identifier (name));
 149   return ssa_name;
 150 }
 151
 152
 153 #endif /* GCC_TREE_SSANAMES_H */