gcc/gimple-range.h

   1 /* Header file for the GIMPLE range interface.
   2    Copyright (C) 2019-2023 Free Software Foundation, Inc.
   3    Contributed by Andrew MacLeod <amacleod@redhat.com>
   4    and Aldy Hernandez <aldyh@redhat.com>.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16  for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef GCC_GIMPLE_RANGE_H
  23 #define GCC_GIMPLE_RANGE_H
  24
  25 #include "ssa.h"
  26 #include "range.h"
  27 #include "value-query.h"
  28 #include "gimple-range-op.h"
  29 #include "gimple-range-trace.h"
  30 #include "gimple-range-edge.h"
  31 #include "gimple-range-fold.h"
  32 #include "gimple-range-gori.h"
  33 #include "gimple-range-cache.h"
  34
  35 // This is the basic range generator interface.
  36 //
  37 // This base class provides all the API entry points, but only provides
  38 // functionality at the statement level.  Ie, it can calculate ranges on
  39 // statements, but does no additional lookup.
  40 //
  41 // All the range_of_* methods will return a range if the types is
  42 // supported by the range engine.  It may be the full range for the
  43 // type, AKA varying_p or it may be a refined range.  If the range
  44 // type is not supported, then false is returned.  Non-statement
  45 // related methods return whatever the current global value is.
  46
  47 class gimple_ranger : public range_query
  48 {
  49 public:
  50   gimple_ranger (bool use_imm_uses = true);
  51   ~gimple_ranger ();
  52   virtual bool range_of_stmt (vrange &r, gimple *, tree name = NULL) override;
  53   virtual bool range_of_expr (vrange &r, tree name, gimple * = NULL) override;
  54   virtual bool range_on_edge (vrange &r, edge e, tree name) override;
  55   virtual void update_stmt (gimple *) override;
  56   void range_on_entry (vrange &r, basic_block bb, tree name);
  57   void range_on_exit (vrange &r, basic_block bb, tree name);
  58   void export_global_ranges ();
  59   inline gori_compute &gori ()  { return m_cache.m_gori; }
  60   virtual void dump (FILE *f) override;
  61   void debug ();
  62   void dump_bb (FILE *f, basic_block bb);
  63   auto_edge_flag non_executable_edge_flag;
  64   bool fold_stmt (gimple_stmt_iterator *gsi, tree (*) (tree));
  65   void register_inferred_ranges (gimple *s);
  66   void register_transitive_inferred_ranges (basic_block bb);
  67   range_query &const_query ();
  68 protected:
  69   bool fold_range_internal (vrange &r, gimple *s, tree name);
  70   void prefill_name (vrange &r, tree name);
  71   void prefill_stmt_dependencies (tree ssa);
  72   ranger_cache m_cache;
  73   range_tracer tracer;
  74   basic_block current_bb;
  75   vec<tree> m_stmt_list;
  76   friend class path_range_query;
  77 };
  78
  79 /* Create a new ranger instance and associate it with a function.
  80    Each call must be paired with a call to disable_ranger to release
  81    resources.  If USE_IMM_USES is true, pre-calculate side effects like
  82    non-null uses as required using the immediate use chains.  */
  83 extern gimple_ranger *enable_ranger (struct function *m,
  84                                      bool use_imm_uses = true);
  85 extern void disable_ranger (struct function *);
  86
  87 class assume_query : public range_query
  88 {
  89 public:
  90   assume_query ();
  91   bool assume_range_p (vrange &r, tree name);
  92   virtual bool range_of_expr (vrange &r, tree expr, gimple * = NULL);
  93   void dump (FILE *f);
  94 protected:
  95   void calculate_stmt (gimple *s, vrange &lhs_range, fur_source &src);
  96   void calculate_op (tree op, gimple *s, vrange &lhs, fur_source &src);
  97   void calculate_phi (gphi *phi, vrange &lhs_range, fur_source &src);
  98   void check_taken_edge (edge e, fur_source &src);
  99
 100   ssa_lazy_cache global;
 101   gori_compute m_gori;
 102 };
 103
 104 // DOM based ranger for fast VRP.
 105 // This must be processed in DOM order, and does only basic range operations.
 106
 107 class dom_ranger : public range_query
 108 {
 109 public:
 110   dom_ranger ();
 111   ~dom_ranger ();
 112
 113   virtual bool range_of_expr (vrange &r, tree expr, gimple *s = NULL) override;
 114   virtual bool range_on_edge (vrange &r, edge e, tree expr) override;
 115   virtual bool range_of_stmt (vrange &r, gimple *s, tree name = NULL) override;
 116
 117   bool edge_range (vrange &r, edge e, tree name);
 118   void range_in_bb (vrange &r, basic_block bb, tree name);
 119
 120   void pre_bb (basic_block bb);
 121   void post_bb (basic_block bb);
 122 protected:
 123   DISABLE_COPY_AND_ASSIGN (dom_ranger);
 124   void maybe_push_edge (edge e, bool edge_0);
 125   ssa_cache m_global;
 126   gimple_outgoing_range m_out;
 127   vec<ssa_lazy_cache *> m_freelist;
 128   vec<ssa_lazy_cache *> m_e0;
 129   vec<ssa_lazy_cache *> m_e1;
 130   bitmap m_pop_list;
 131   range_tracer tracer;
 132 };
 133 #endif // GCC_GIMPLE_RANGE_H