gcc/tree-ssanames.h

   1 /* SSA name expresssons routines
   2    Copyright (C) 2013 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
  49 #define SSANAMES(fun) (fun)->gimple_df->ssa_names
  50 #define MODIFIED_NORETURN_CALLS(fun) (fun)->gimple_df->modified_noreturn_calls
  51 #define DEFAULT_DEFS(fun) (fun)->gimple_df->default_defs
  52
  53 #define num_ssa_names (vec_safe_length (cfun->gimple_df->ssa_names))
  54 #define ssa_name(i) ((*cfun->gimple_df->ssa_names)[(i)])
  55
  56
  57 extern void init_ssanames (struct function *, int);
  58 extern void fini_ssanames (void);
  59 extern void ssanames_print_statistics (void);
  60 extern tree make_ssa_name_fn (struct function *, tree, gimple);
  61 extern void release_ssa_name (tree);
  62 extern bool get_ptr_info_alignment (struct ptr_info_def *, unsigned int *,
  63                                     unsigned int *);
  64 extern void mark_ptr_info_alignment_unknown (struct ptr_info_def *);
  65 extern void set_ptr_info_alignment (struct ptr_info_def *, unsigned int,
  66                                     unsigned int);
  67 extern void adjust_ptr_info_misalignment (struct ptr_info_def *,
  68                                           unsigned int);
  69 extern struct ptr_info_def *get_ptr_info (tree);
  70
  71 extern tree copy_ssa_name_fn (struct function *, tree, gimple);
  72 extern void duplicate_ssa_name_ptr_info (tree, struct ptr_info_def *);
  73 extern tree duplicate_ssa_name_fn (struct function *, tree, gimple);
  74 extern void release_defs (gimple);
  75 extern void replace_ssa_name_symbol (tree, tree);
  76
  77
  78 /* Return an SSA_NAME node for variable VAR defined in statement STMT
  79    in function cfun.  */
  80
  81 static inline tree
  82 make_ssa_name (tree var, gimple stmt)
  83 {
  84   return make_ssa_name_fn (cfun, var, stmt);
  85 }
  86
  87 /* Return an SSA_NAME node using the template SSA name NAME defined in
  88    statement STMT in function cfun.  */
  89
  90 static inline tree
  91 copy_ssa_name (tree var, gimple stmt)
  92 {
  93   return copy_ssa_name_fn (cfun, var, stmt);
  94 }
  95
  96 /*  Creates a duplicate of a SSA name NAME tobe defined by statement STMT
  97     in function cfun.  */
  98
  99 static inline tree
 100 duplicate_ssa_name (tree var, gimple stmt)
 101 {
 102   return duplicate_ssa_name_fn (cfun, var, stmt);
 103 }
 104
 105 /* Return an anonymous SSA_NAME node for type TYPE defined in statement STMT
 106    in function cfun.  Arrange so that it uses NAME in dumps.  */
 107
 108 static inline tree
 109 make_temp_ssa_name (tree type, gimple stmt, const char *name)
 110 {
 111   tree ssa_name;
 112   gcc_checking_assert (TYPE_P (type));
 113   ssa_name = make_ssa_name_fn (cfun, type, stmt);
 114   SET_SSA_NAME_VAR_OR_IDENTIFIER (ssa_name, get_identifier (name));
 115   return ssa_name;
 116 }
 117
 118
 119 #endif /* GCC_TREE_SSANAMES_H */