gcc/cgraph.h

   1 /* Callgraph handling code.
   2    Copyright (C) 2003 Free Software Foundation, Inc.
   3    Contributed by Jan Hubicka
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22 #ifndef GCC_CGRAPH_H
  23 #define GCC_CGRAPH_H
  24
  25 /* Information about the function collected locally.
  26    Available after function is lowered  */
  27
  28 struct cgraph_local_info GTY(())
  29 {
  30   /* Set when function function is visiable in current compilation unit only
  31      and it's address is never taken.  */
  32   bool local;
  33   /* Set when function is small enought to be inlinable many times.  */
  34   bool inline_many;
  35   /* Set when function can be inlined once (false only for functions calling
  36      alloca, using varargs and so on).  */
  37   bool can_inline_once;
  38 };
  39
  40 /* Information about the function that needs to be computed globally
  41    once compilation is finished.  Available only with -funit-at-time.  */
  42
  43 struct cgraph_global_info GTY(())
  44 {
  45   /* Set when the function will be inlined exactly once.  */
  46   bool inline_once;
  47 };
  48
  49 /* Information about the function that is propagated by the RTL backend.
  50    Available only for functions that has been already assembled.  */
  51
  52 struct cgraph_rtl_info GTY(())
  53 {
  54    bool const_function;
  55    bool pure_function;
  56    int preferred_incoming_stack_boundary;
  57 };
  58
  59
  60 /* The cgraph data strutcture.
  61    Each function decl has assigned cgraph_node listing calees and callers.  */
  62
  63 struct cgraph_node GTY(())
  64 {
  65   tree decl;
  66   struct cgraph_edge *callees;
  67   struct cgraph_edge *callers;
  68   struct cgraph_node *next;
  69   struct cgraph_node *previous;
  70   /* For nested functions points to function the node is nested in.  */
  71   struct cgraph_node *origin;
  72   /* Points to first nested function, if any.  */
  73   struct cgraph_node *nested;
  74   /* Pointer to the next function with same origin, if any.  */
  75   struct cgraph_node *next_nested;
  76   PTR GTY ((skip (""))) aux;
  77
  78   /* Set when function must be output - it is externally visible
  79      or it's address is taken.  */
  80   bool needed;
  81   /* Set when function is reachable by call from other function
  82      that is eighter reachable or needed.  */
  83   bool reachable;
  84   /* Set when the frontend has been asked to lower representation of this
  85      function into trees.  Callees lists are not available when lowered
  86      is not set.  */
  87   bool lowered;
  88   /* Set when function is scheduled to be assembled.  */
  89   bool output;
  90   struct cgraph_local_info local;
  91   struct cgraph_global_info global;
  92   struct cgraph_rtl_info rtl;
  93 };
  94
  95 struct cgraph_edge GTY(())
  96 {
  97   struct cgraph_node *caller;
  98   struct cgraph_node *callee;
  99   struct cgraph_edge *next_caller;
 100   struct cgraph_edge *next_callee;
 101 };
 102
 103 /* The cgraph_varpool data strutcture.
 104    Each static variable decl has assigned cgraph_varpool_node.  */
 105
 106 struct cgraph_varpool_node GTY(())
 107 {
 108   tree decl;
 109   PTR GTY ((skip (""))) aux;
 110
 111   /* Set when function must be output - it is externally visible
 112      or it's address is taken.  */
 113   bool needed;
 114   /* Set once it has been finalized so we consider it to be output.  */
 115   bool finalized;
 116   /* Set when function is scheduled to be assembled.  */
 117   bool output;
 118 };
 119
 120 extern GTY(()) struct cgraph_node *cgraph_nodes;
 121 extern GTY(()) int cgraph_n_nodes;
 122 extern bool cgraph_global_info_ready;
 123 extern GTY(()) struct cgraph_node *cgraph_nodes_queue;
 124
 125 extern GTY(()) int cgraph_varpool_n_nodes;
 126 extern GTY(()) struct cgraph_varpool_node *cgraph_varpool_nodes_queue;
 127
 128
 129 /* In cgraph.c  */
 130 void dump_cgraph                        PARAMS ((FILE *));
 131 void cgraph_remove_call                 PARAMS ((tree, tree));
 132 void cgraph_remove_node                 PARAMS ((struct cgraph_node *));
 133 struct cgraph_edge *cgraph_record_call  PARAMS ((tree, tree));
 134 struct cgraph_node *cgraph_node         PARAMS ((tree decl));
 135 struct cgraph_node *cgraph_node_for_identifier  PARAMS ((tree id));
 136 bool cgraph_calls_p                     PARAMS ((tree, tree));
 137 struct cgraph_local_info *cgraph_local_info PARAMS ((tree));
 138 struct cgraph_global_info *cgraph_global_info PARAMS ((tree));
 139 struct cgraph_rtl_info *cgraph_rtl_info PARAMS ((tree));
 140
 141 struct cgraph_varpool_node *cgraph_varpool_node (tree decl);
 142 struct cgraph_varpool_node *cgraph_varpool_node_for_identifier (tree id);
 143 void cgraph_varpool_mark_needed_node (struct cgraph_varpool_node *);
 144 void cgraph_varpool_finalize_decl (tree);
 145 bool cgraph_varpool_assemble_pending_decls (void);
 146
 147 /* In cgraphunit.c  */
 148 void cgraph_finalize_function           PARAMS ((tree, tree));
 149 void cgraph_finalize_compilation_unit   PARAMS ((void));
 150 void cgraph_create_edges                PARAMS ((tree, tree));
 151 void cgraph_optimize                    PARAMS ((void));
 152 void cgraph_mark_needed_node            PARAMS ((struct cgraph_node *, int));
 153
 154 #endif  /* GCC_CGRAPH_H  */