gcc/tree-ssanames.h

   1 /* SSA name expresssons routines
   2    Copyright (C) 2013-2020 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 #define FOR_EACH_SSA_NAME(I, VAR, FN)                                   \
  66   for (I = 1; SSANAMES (FN)->iterate (I, &VAR); ++I)                    \
  67     if (VAR)
  68
  69 /* Sets the value range to SSA.  */
  70 extern void set_range_info (tree, enum value_range_kind, const wide_int_ref &,
  71                             const wide_int_ref &);
  72 extern void set_range_info (tree, const value_range &);
  73 /* Gets the value range from SSA.  */
  74 extern enum value_range_kind get_range_info (const_tree, wide_int *,
  75                                              wide_int *);
  76 extern enum value_range_kind get_range_info (const_tree, irange &);
  77 extern void set_nonzero_bits (tree, const wide_int_ref &);
  78 extern wide_int get_nonzero_bits (const_tree);
  79 extern bool ssa_name_has_boolean_range (tree);
  80 extern void init_ssanames (struct function *, int);
  81 extern void fini_ssanames (struct function *);
  82 extern void ssanames_print_statistics (void);
  83 extern tree make_ssa_name_fn (struct function *, tree, gimple *,
  84                               unsigned int version = 0);
  85 extern void init_ssa_name_imm_use (tree);
  86 extern void release_ssa_name_fn (struct function *, tree);
  87 extern bool get_ptr_info_alignment (struct ptr_info_def *, unsigned int *,
  88                                     unsigned int *);
  89 extern void mark_ptr_info_alignment_unknown (struct ptr_info_def *);
  90 extern void set_ptr_info_alignment (struct ptr_info_def *, unsigned int,
  91                                     unsigned int);
  92 extern void adjust_ptr_info_misalignment (struct ptr_info_def *, poly_uint64);
  93 extern struct ptr_info_def *get_ptr_info (tree);
  94 extern void set_ptr_nonnull (tree);
  95 extern bool get_ptr_nonnull (const_tree);
  96
  97 extern tree copy_ssa_name_fn (struct function *, tree, gimple *);
  98 extern void duplicate_ssa_name_ptr_info (tree, struct ptr_info_def *);
  99 extern tree duplicate_ssa_name_fn (struct function *, tree, gimple *);
 100 extern void duplicate_ssa_name_range_info (tree, enum value_range_kind,
 101                                            struct range_info_def *);
 102 extern void reset_flow_sensitive_info (tree);
 103 extern void reset_flow_sensitive_info_in_bb (basic_block);
 104 extern void release_defs (gimple *);
 105 extern void replace_ssa_name_symbol (tree, tree);
 106 extern void flush_ssaname_freelist (void);
 107
 108
 109 /* Return an SSA_NAME node for variable VAR defined in statement STMT
 110    in function cfun.  */
 111
 112 static inline tree
 113 make_ssa_name (tree var, gimple *stmt = NULL)
 114 {
 115   return make_ssa_name_fn (cfun, var, stmt);
 116 }
 117
 118 /* Return an SSA_NAME node using the template SSA name NAME defined in
 119    statement STMT in function cfun.  */
 120
 121 static inline tree
 122 copy_ssa_name (tree var, gimple *stmt = NULL)
 123 {
 124   return copy_ssa_name_fn (cfun, var, stmt);
 125 }
 126
 127 /*  Creates a duplicate of a SSA name NAME tobe defined by statement STMT
 128     in function cfun.  */
 129
 130 static inline tree
 131 duplicate_ssa_name (tree var, gimple *stmt)
 132 {
 133   return duplicate_ssa_name_fn (cfun, var, stmt);
 134 }
 135
 136 /* Release the SSA name NAME used in function cfun.  */
 137
 138 static inline void
 139 release_ssa_name (tree name)
 140 {
 141   release_ssa_name_fn (cfun, name);
 142 }
 143
 144 /* Return an anonymous SSA_NAME node for type TYPE defined in statement STMT
 145    in function cfun.  Arrange so that it uses NAME in dumps.  */
 146
 147 static inline tree
 148 make_temp_ssa_name (tree type, gimple *stmt, const char *name)
 149 {
 150   tree ssa_name;
 151   gcc_checking_assert (TYPE_P (type));
 152   ssa_name = make_ssa_name_fn (cfun, type, stmt);
 153   SET_SSA_NAME_VAR_OR_IDENTIFIER (ssa_name, get_identifier (name));
 154   return ssa_name;
 155 }
 156
 157
 158 #endif /* GCC_TREE_SSANAMES_H */