gcc/cgraph.h

   1 /* Callgraph handling code.
   2    Copyright (C) 2003, 2004 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 #include "hashtab.h"
  25
  26 /* Information about the function collected locally.
  27    Available after function is analyzed.  */
  28
  29 struct cgraph_local_info GTY(())
  30 {
  31   /* Size of the function before inlining.  */
  32   int self_insns;
  33   /* Set when function function is visible in current compilation unit only
  34      and it's address is never taken.  */
  35   bool local;
  36   /* Set once it has been finalized so we consider it to be output.  */
  37   bool finalized;
  38
  39   /* False when there something makes inlining impossible (such as va_arg).  */
  40   bool inlinable;
  41   /* True when function should be inlined independently on it's size.  */
  42   bool disregard_inline_limits;
  43   /* True when the function has been originally extern inline, but it is
  44      redefined now.  */
  45   bool redefined_extern_inline;
  46 };
  47
  48 /* Information about the function that needs to be computed globally
  49    once compilation is finished.  Available only with -funit-at-time.  */
  50
  51 struct cgraph_global_info GTY(())
  52 {
  53   /* For inline clones this points to the function they will be inlined into.  */
  54   struct cgraph_node *inlined_to;
  55
  56   /* Estimated size of the function after inlining.  */
  57   int insns;
  58
  59   /* Set iff the function has been inlined at least once.  */
  60   bool inlined;
  61 };
  62
  63 /* Information about the function that is propagated by the RTL backend.
  64    Available only for functions that has been already assembled.  */
  65
  66 struct cgraph_rtl_info GTY(())
  67 {
  68    int preferred_incoming_stack_boundary;
  69    bool const_function;
  70    bool pure_function;
  71 };
  72
  73
  74 /* The cgraph data structure.
  75    Each function decl has assigned cgraph_node listing callees and callers.  */
  76
  77 struct cgraph_node GTY((chain_next ("%h.next"), chain_prev ("%h.previous")))
  78 {
  79   tree decl;
  80   struct cgraph_edge *callees;
  81   struct cgraph_edge *callers;
  82   struct cgraph_node *next;
  83   struct cgraph_node *previous;
  84   /* For nested functions points to function the node is nested in.  */
  85   struct cgraph_node *origin;
  86   /* Points to first nested function, if any.  */
  87   struct cgraph_node *nested;
  88   /* Pointer to the next function with same origin, if any.  */
  89   struct cgraph_node *next_nested;
  90   /* Pointer to the next function in cgraph_nodes_queue.  */
  91   struct cgraph_node *next_needed;
  92   /* Pointer to the next clone.  */
  93   struct cgraph_node *next_clone;
  94   PTR GTY ((skip)) aux;
  95
  96   struct cgraph_local_info local;
  97   struct cgraph_global_info global;
  98   struct cgraph_rtl_info rtl;
  99   /* Unique id of the node.  */
 100   int uid;
 101   /* Set when function must be output - it is externally visible
 102      or it's address is taken.  */
 103   bool needed;
 104   /* Set when function is reachable by call from other function
 105      that is either reachable or needed.  */
 106   bool reachable;
 107   /* Set once the function has been instantiated and its callee
 108      lists created.  */
 109   bool analyzed;
 110   /* Set when function is scheduled to be assembled.  */
 111   bool output;
 112 };
 113
 114 struct cgraph_edge GTY((chain_next ("%h.next_caller")))
 115 {
 116   struct cgraph_node *caller;
 117   struct cgraph_node *callee;
 118   struct cgraph_edge *next_caller;
 119   struct cgraph_edge *next_callee;
 120   tree call_expr;
 121   PTR GTY ((skip (""))) aux;
 122   /* When NULL, inline this call.  When non-NULL, points to the explanation
 123      why function was not inlined.  */
 124   const char *inline_failed;
 125 };
 126
 127 /* The cgraph_varpool data structure.
 128    Each static variable decl has assigned cgraph_varpool_node.  */
 129
 130 struct cgraph_varpool_node GTY(())
 131 {
 132   tree decl;
 133   /* Pointer to the next function in cgraph_varpool_nodes_queue.  */
 134   struct cgraph_varpool_node *next_needed;
 135
 136   /* Set when function must be output - it is externally visible
 137      or it's address is taken.  */
 138   bool needed;
 139   /* Set once it has been finalized so we consider it to be output.  */
 140   bool finalized;
 141   /* Set when function is scheduled to be assembled.  */
 142   bool output;
 143 };
 144
 145 extern GTY(()) struct cgraph_node *cgraph_nodes;
 146 extern GTY(()) int cgraph_n_nodes;
 147 extern GTY(()) int cgraph_max_uid;
 148 extern bool cgraph_global_info_ready;
 149 extern GTY(()) struct cgraph_node *cgraph_nodes_queue;
 150 extern FILE *cgraph_dump_file;
 151
 152 extern GTY(()) int cgraph_varpool_n_nodes;
 153 extern GTY(()) struct cgraph_varpool_node *cgraph_varpool_nodes_queue;
 154 extern GTY((param_is (union tree_node))) htab_t cgraph_inline_hash;
 155
 156
 157 /* In cgraph.c  */
 158 void dump_cgraph (FILE *);
 159 void dump_cgraph_node (FILE *, struct cgraph_node *);
 160 void cgraph_remove_edge (struct cgraph_edge *);
 161 void cgraph_remove_node (struct cgraph_node *);
 162 struct cgraph_edge *cgraph_create_edge (struct cgraph_node *,
 163                                         struct cgraph_node *,
 164                                         tree);
 165 struct cgraph_node *cgraph_node (tree decl);
 166 struct cgraph_edge *cgraph_edge (struct cgraph_node *, tree call_expr);
 167 struct cgraph_node *cgraph_node_for_identifier (tree id);
 168 bool cgraph_calls_p (tree, tree);
 169 struct cgraph_local_info *cgraph_local_info (tree);
 170 struct cgraph_global_info *cgraph_global_info (tree);
 171 struct cgraph_rtl_info *cgraph_rtl_info (tree);
 172 const char * cgraph_node_name (struct cgraph_node *);
 173 struct cgraph_edge * cgraph_clone_edge (struct cgraph_edge *, struct cgraph_node *, tree);
 174 struct cgraph_node * cgraph_clone_node (struct cgraph_node *);
 175
 176 struct cgraph_varpool_node *cgraph_varpool_node (tree decl);
 177 struct cgraph_varpool_node *cgraph_varpool_node_for_identifier (tree id);
 178 void cgraph_varpool_mark_needed_node (struct cgraph_varpool_node *);
 179 void cgraph_varpool_finalize_decl (tree);
 180 bool cgraph_varpool_assemble_pending_decls (void);
 181 void cgraph_redirect_edge_callee (struct cgraph_edge *, struct cgraph_node *);
 182
 183 bool cgraph_function_possibly_inlined_p (tree);
 184
 185 /* In cgraphunit.c  */
 186 bool cgraph_assemble_pending_functions (void);
 187 void cgraph_finalize_function (tree, bool);
 188 void cgraph_finalize_compilation_unit (void);
 189 void cgraph_create_edges (struct cgraph_node *, tree);
 190 void cgraph_optimize (void);
 191 void cgraph_mark_needed_node (struct cgraph_node *);
 192 void cgraph_mark_reachable_node (struct cgraph_node *);
 193 bool cgraph_inline_p (struct cgraph_edge *, const char **reason);
 194 bool cgraph_preserve_function_body_p (tree);
 195 void verify_cgraph (void);
 196 void verify_cgraph_node (struct cgraph_node *);
 197 void cgraph_mark_inline_edge (struct cgraph_edge *e);
 198 void cgraph_clone_inlined_nodes (struct cgraph_edge *e, bool duplicate);
 199
 200 #endif  /* GCC_CGRAPH_H  */