gcc/cgraph.h

   1 /* Callgraph handling code.
   2    Copyright (C) 2003, 2004, 2005 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, 51 Franklin Street, Fifth Floor, Boston, MA
  20 02110-1301, USA.  */
  21
  22 #ifndef GCC_CGRAPH_H
  23 #define GCC_CGRAPH_H
  24 #include "tree.h"
  25 #include "basic-block.h"
  26
  27 enum availability
  28 {
  29   /* Not yet set by cgraph_function_body_availability.  */
  30   AVAIL_UNSET,
  31   /* Function body/variable initializer is unknown.  */
  32   AVAIL_NOT_AVAILABLE,
  33   /* Function body/variable initializer is known but might be replaced
  34      by a different one from other compilation unit and thus needs to
  35      be dealt with a care.  Like AVAIL_NOT_AVAILABLE it can have
  36      arbitrary side effects on escaping variables and functions, while
  37      like AVAILABLE it might access static variables.  */
  38   AVAIL_OVERWRITABLE,
  39   /* Function body/variable initializer is known and will be used in final
  40      program.  */
  41   AVAIL_AVAILABLE,
  42   /* Function body/variable initializer is known and all it's uses are explicitly
  43      visible within current unit (ie it's address is never taken and it is not
  44      exported to other units).
  45      Currently used only for functions.  */
  46   AVAIL_LOCAL
  47 };
  48
  49 /* Information about the function collected locally.
  50    Available after function is analyzed.  */
  51
  52 struct cgraph_local_info GTY(())
  53 {
  54   /* Size of the function before inlining.  */
  55   int self_insns;
  56
  57   /* Set when function function is visible in current compilation unit only
  58      and its address is never taken.  */
  59   bool local;
  60
  61   /* Set when function is visible by other units.  */
  62   bool externally_visible;
  63
  64   /* Set once it has been finalized so we consider it to be output.  */
  65   bool finalized;
  66
  67   /* False when there something makes inlining impossible (such as va_arg).  */
  68   bool inlinable;
  69
  70   /* True when function should be inlined independently on its size.  */
  71   bool disregard_inline_limits;
  72
  73   /* True when the function has been originally extern inline, but it is
  74      redefined now.  */
  75   bool redefined_extern_inline;
  76
  77   /* True if statics_read_for_function and
  78      statics_written_for_function contain valid data.  */
  79   bool for_functions_valid;
  80
  81   /* True if the function is going to be emitted in some other translation
  82      unit, referenced from vtable.  */
  83   bool vtable_method;
  84 };
  85
  86 /* Information about the function that needs to be computed globally
  87    once compilation is finished.  Available only with -funit-at-time.  */
  88
  89 struct cgraph_global_info GTY(())
  90 {
  91   /* For inline clones this points to the function they will be inlined into.  */
  92   struct cgraph_node *inlined_to;
  93
  94   /* Estimated size of the function after inlining.  */
  95   int insns;
  96
  97   /* Estimated growth after inlining.  INT_MIN if not computed.  */
  98   int estimated_growth;
  99
 100   /* Set iff the function has been inlined at least once.  */
 101   bool inlined;
 102 };
 103
 104 /* Information about the function that is propagated by the RTL backend.
 105    Available only for functions that has been already assembled.  */
 106
 107 struct cgraph_rtl_info GTY(())
 108 {
 109    int preferred_incoming_stack_boundary;
 110 };
 111
 112 /* The cgraph data structure.
 113    Each function decl has assigned cgraph_node listing callees and callers.  */
 114
 115 struct cgraph_node GTY((chain_next ("%h.next"), chain_prev ("%h.previous")))
 116 {
 117   tree decl;
 118   struct cgraph_edge *callees;
 119   struct cgraph_edge *callers;
 120   struct cgraph_node *next;
 121   struct cgraph_node *previous;
 122   /* For nested functions points to function the node is nested in.  */
 123   struct cgraph_node *origin;
 124   /* Points to first nested function, if any.  */
 125   struct cgraph_node *nested;
 126   /* Pointer to the next function with same origin, if any.  */
 127   struct cgraph_node *next_nested;
 128   /* Pointer to the next function in cgraph_nodes_queue.  */
 129   struct cgraph_node *next_needed;
 130   /* Pointer to the next clone.  */
 131   struct cgraph_node *next_clone;
 132   struct cgraph_node *prev_clone;
 133   /* Pointer to a single unique cgraph node for this function.  If the
 134      function is to be output, this is the copy that will survive.  */
 135   struct cgraph_node *master_clone;
 136
 137   PTR GTY ((skip)) aux;
 138
 139   struct cgraph_local_info local;
 140   struct cgraph_global_info global;
 141   struct cgraph_rtl_info rtl;
 142
 143   /* Expected number of executions: calculated in profile.c.  */
 144   gcov_type count;
 145   /* Unique id of the node.  */
 146   int uid;
 147   /* Set when function must be output - it is externally visible
 148      or its address is taken.  */
 149   bool needed;
 150   /* Set when function is reachable by call from other function
 151      that is either reachable or needed.  */
 152   bool reachable;
 153   /* Set once the function is lowered (ie it's CFG is built).  */
 154   bool lowered;
 155   /* Set once the function has been instantiated and its callee
 156      lists created.  */
 157   bool analyzed;
 158   /* Set when function is scheduled to be assembled.  */
 159   bool output;
 160   /* Set when function is visible by other units.  */
 161   bool externally_visible;
 162   /* Set for aliases once they got through assemble_alias.  */
 163   bool alias;
 164 };
 165
 166 struct cgraph_edge GTY((chain_next ("%h.next_caller"), chain_prev ("%h.prev_caller")))
 167 {
 168   struct cgraph_node *caller;
 169   struct cgraph_node *callee;
 170   struct cgraph_edge *prev_caller;
 171   struct cgraph_edge *next_caller;
 172   struct cgraph_edge *prev_callee;
 173   struct cgraph_edge *next_callee;
 174   tree call_stmt;
 175   PTR GTY ((skip (""))) aux;
 176   /* When NULL, inline this call.  When non-NULL, points to the explanation
 177      why function was not inlined.  */
 178   const char *inline_failed;
 179   /* Expected number of executions: calculated in profile.c.  */
 180   gcov_type count;
 181   /* Depth of loop nest, 1 means no loop nest.  */
 182   int loop_nest;
 183 };
 184
 185 /* The cgraph_varpool data structure.
 186    Each static variable decl has assigned cgraph_varpool_node.  */
 187
 188 struct cgraph_varpool_node GTY(())
 189 {
 190   tree decl;
 191   /* Pointer to the next function in cgraph_varpool_nodes.  */
 192   struct cgraph_varpool_node *next;
 193   /* Pointer to the next function in cgraph_varpool_nodes_queue.  */
 194   struct cgraph_varpool_node *next_needed;
 195
 196   /* Set when function must be output - it is externally visible
 197      or its address is taken.  */
 198   bool needed;
 199   /* Needed variables might become dead by optimization.  This flag
 200      forces the variable to be output even if it appears dead otherwise.  */
 201   bool force_output;
 202   /* Set once the variable has been instantiated and its callee
 203      lists created.  */
 204   bool analyzed;
 205   /* Set once it has been finalized so we consider it to be output.  */
 206   bool finalized;
 207   /* Set when variable is scheduled to be assembled.  */
 208   bool output;
 209   /* Set when function is visible by other units.  */
 210   bool externally_visible;
 211   /* Set for aliases once they got through assemble_alias.  */
 212   bool alias;
 213 };
 214
 215 extern GTY(()) struct cgraph_node *cgraph_nodes;
 216 extern GTY(()) int cgraph_n_nodes;
 217 extern GTY(()) int cgraph_max_uid;
 218 extern bool cgraph_global_info_ready;
 219 extern bool cgraph_function_flags_ready;
 220 extern GTY(()) struct cgraph_node *cgraph_nodes_queue;
 221
 222 extern GTY(()) struct cgraph_varpool_node *cgraph_varpool_first_unanalyzed_node;
 223 extern GTY(()) struct cgraph_varpool_node *cgraph_varpool_nodes_queue;
 224
 225 /* In cgraph.c  */
 226 void dump_cgraph (FILE *);
 227 void dump_cgraph_node (FILE *, struct cgraph_node *);
 228 void dump_varpool (FILE *);
 229 void dump_cgraph_varpool_node (FILE *, struct cgraph_varpool_node *);
 230 void cgraph_remove_edge (struct cgraph_edge *);
 231 void cgraph_remove_node (struct cgraph_node *);
 232 void cgraph_node_remove_callees (struct cgraph_node *node);
 233 struct cgraph_edge *cgraph_create_edge (struct cgraph_node *,
 234                                         struct cgraph_node *,
 235                                         tree, gcov_type, int);
 236 struct cgraph_node *cgraph_node (tree);
 237 struct cgraph_node *cgraph_node_for_asm (tree asmname);
 238 struct cgraph_edge *cgraph_edge (struct cgraph_node *, tree);
 239 struct cgraph_local_info *cgraph_local_info (tree);
 240 struct cgraph_global_info *cgraph_global_info (tree);
 241 struct cgraph_rtl_info *cgraph_rtl_info (tree);
 242 const char * cgraph_node_name (struct cgraph_node *);
 243 struct cgraph_edge * cgraph_clone_edge (struct cgraph_edge *,
 244                                         struct cgraph_node *,
 245                                         tree, gcov_type, int, bool);
 246 struct cgraph_node * cgraph_clone_node (struct cgraph_node *, gcov_type,
 247                                         int, bool);
 248
 249 struct cgraph_varpool_node *cgraph_varpool_node (tree);
 250 struct cgraph_varpool_node *cgraph_varpool_node_for_asm (tree asmname);
 251 void cgraph_varpool_mark_needed_node (struct cgraph_varpool_node *);
 252 void cgraph_varpool_finalize_decl (tree);
 253 void cgraph_redirect_edge_callee (struct cgraph_edge *, struct cgraph_node *);
 254
 255 bool cgraph_function_possibly_inlined_p (tree);
 256 void cgraph_unnest_node (struct cgraph_node *);
 257 void cgraph_varpool_enqueue_needed_node (struct cgraph_varpool_node *);
 258 void cgraph_varpool_reset_queue (void);
 259 bool decide_is_variable_needed (struct cgraph_varpool_node *, tree);
 260
 261 enum availability cgraph_function_body_availability (struct cgraph_node *);
 262 enum availability cgraph_variable_initializer_availability (struct cgraph_varpool_node *);
 263 bool cgraph_is_master_clone (struct cgraph_node *);
 264 struct cgraph_node *cgraph_master_clone (struct cgraph_node *);
 265
 266 /* In cgraphunit.c  */
 267 bool cgraph_assemble_pending_functions (void);
 268 bool cgraph_varpool_assemble_pending_decls (void);
 269 void cgraph_finalize_function (tree, bool);
 270 void cgraph_lower_function (struct cgraph_node *);
 271 void cgraph_finalize_compilation_unit (void);
 272 void cgraph_optimize (void);
 273 void cgraph_mark_needed_node (struct cgraph_node *);
 274 void cgraph_mark_reachable_node (struct cgraph_node *);
 275 bool cgraph_inline_p (struct cgraph_edge *, const char **reason);
 276 bool cgraph_preserve_function_body_p (tree);
 277 void verify_cgraph (void);
 278 void verify_cgraph_node (struct cgraph_node *);
 279 void cgraph_build_static_cdtor (char which, tree body, int priority);
 280 void cgraph_reset_static_var_maps (void);
 281 void init_cgraph (void);
 282 struct cgraph_node *cgraph_function_versioning (struct cgraph_node *,
 283                                                 varray_type, varray_type);
 284
 285 /* In ipa.c  */
 286 bool cgraph_remove_unreachable_nodes (bool, FILE *);
 287 int cgraph_postorder (struct cgraph_node **);
 288
 289 /* In ipa-inline.c  */
 290 bool cgraph_decide_inlining_incrementally (struct cgraph_node *, bool);
 291 void cgraph_clone_inlined_nodes (struct cgraph_edge *, bool, bool);
 292 void cgraph_mark_inline_edge (struct cgraph_edge *, bool);
 293 bool cgraph_default_inline_p (struct cgraph_node *, const char **);
 294 #endif  /* GCC_CGRAPH_H  */