gcc/cgraph.c

   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 /*  This file contains basic routines manipulating call graph and variable pool
  23
  24 The callgraph:
  25
  26     The call-graph is data structure designed for intra-procedural optimization
  27     but it is also used in non-unit-at-a-time compilation to allow easier code
  28     sharing.
  29
  30     The call-graph consist of nodes and edges represented via linked lists.
  31     Each function (external or not) corresponds to the unique node (in
  32     contrast to tree DECL nodes where we can have multiple nodes for each
  33     function).
  34
  35     The mapping from declarations to call-graph nodes is done using hash table
  36     based on DECL_ASSEMBLER_NAME, so it is essential for assembler name to
  37     not change once the declaration is inserted into the call-graph.
  38     The call-graph nodes are created lazily using cgraph_node function when
  39     called for unknown declaration.
  40
  41     When built, there is one edge for each direct call.  It is possible that
  42     the reference will be later optimized out.  The call-graph is built
  43     conservatively in order to make conservative data flow analysis possible.
  44
  45     The callgraph at the moment does not represent indirect calls or calls
  46     from other compilation unit.  Flag NEEDED is set for each node that may
  47     be accessed in such a invisible way and it shall be considered an
  48     entry point to the callgraph.
  49
  50     Intraprocedural information:
  51
  52       Callgraph is place to store data needed for intraprocedural optimization.
  53       All data structures are divided into three components: local_info that
  54       is produced while analyzing the function, global_info that is result
  55       of global walking of the callgraph on the end of compilation and
  56       rtl_info used by RTL backend to propagate data from already compiled
  57       functions to their callers.
  58
  59     Inlining plans:
  60
  61       The function inlining information is decided in advance and maintained
  62       in the callgraph as so called inline plan.
  63       For each inlined call, the callee's node is cloned to represent the
  64       new function copy produced by inlininer.
  65       Each inlined call gets a unique corresponding clone node of the callee
  66       and the data structure is updated while inlining is performed, so
  67       the clones are eliminated and their callee edges redirected to the
  68       caller.
  69
  70       Each edge has "inline_failed" field.  When the field is set to NULL,
  71       the call will be inlined.  When it is non-NULL it contains a reason
  72       why inlining wasn't performed.
  73
  74
  75 The varpool data structure:
  76
  77     Varpool is used to maintain variables in similar manner as call-graph
  78     is used for functions.  Most of the API is symmetric replacing cgraph
  79     function prefix by cgraph_varpool  */
  80
  81
  82 #include "config.h"
  83 #include "system.h"
  84 #include "coretypes.h"
  85 #include "tm.h"
  86 #include "tree.h"
  87 #include "langhooks.h"
  88 #include "hashtab.h"
  89 #include "toplev.h"
  90 #include "flags.h"
  91 #include "ggc.h"
  92 #include "debug.h"
  93 #include "target.h"
  94 #include "cgraph.h"
  95 #include "varray.h"
  96 #include "output.h"
  97 #include "intl.h"
  98
  99 /* Hash table used to convert declarations into nodes.  */
 100 static GTY((param_is (struct cgraph_node))) htab_t cgraph_hash;
 101
 102 /* The linked list of cgraph nodes.  */
 103 struct cgraph_node *cgraph_nodes;
 104
 105 /* Queue of cgraph nodes scheduled to be lowered.  */
 106 struct cgraph_node *cgraph_nodes_queue;
 107
 108 /* Number of nodes in existence.  */
 109 int cgraph_n_nodes;
 110
 111 /* Maximal uid used in cgraph nodes.  */
 112 int cgraph_max_uid;
 113
 114 /* Set when whole unit has been analyzed so we can access global info.  */
 115 bool cgraph_global_info_ready = false;
 116
 117 /* Hash table used to convert declarations into nodes.  */
 118 static GTY((param_is (struct cgraph_varpool_node))) htab_t cgraph_varpool_hash;
 119
 120 /* Queue of cgraph nodes scheduled to be lowered and output.  */
 121 struct cgraph_varpool_node *cgraph_varpool_nodes_queue;
 122
 123 /* Number of nodes in existence.  */
 124 int cgraph_varpool_n_nodes;
 125
 126 /* The linked list of cgraph varpool nodes.  */
 127 static GTY(())  struct cgraph_varpool_node *cgraph_varpool_nodes;
 128
 129 static hashval_t hash_node (const void *);
 130 static int eq_node (const void *, const void *);
 131
 132 /* Returns a hash code for P.  */
 133
 134 static hashval_t
 135 hash_node (const void *p)
 136 {
 137   const struct cgraph_node *n = p;
 138   return (hashval_t) DECL_UID (n->decl);
 139 }
 140
 141 /* Returns nonzero if P1 and P2 are equal.  */
 142
 143 static int
 144 eq_node (const void *p1, const void *p2)
 145 {
 146   const struct cgraph_node *n1 = p1, *n2 = p2;
 147   return DECL_UID (n1->decl) == DECL_UID (n2->decl);
 148 }
 149
 150 /* Allocate new callgraph node and insert it into basic data structures.  */
 151 static struct cgraph_node *
 152 cgraph_create_node (void)
 153 {
 154   struct cgraph_node *node;
 155
 156   node = ggc_alloc_cleared (sizeof (*node));
 157   node->next = cgraph_nodes;
 158   node->uid = cgraph_max_uid++;
 159   if (cgraph_nodes)
 160     cgraph_nodes->previous = node;
 161   node->previous = NULL;
 162   cgraph_nodes = node;
 163   cgraph_n_nodes++;
 164   return node;
 165 }
 166
 167 /* Return cgraph node assigned to DECL.  Create new one when needed.  */
 168 struct cgraph_node *
 169 cgraph_node (tree decl)
 170 {
 171   struct cgraph_node key, *node, **slot;
 172
 173   if (TREE_CODE (decl) != FUNCTION_DECL)
 174     abort ();
 175
 176   if (!cgraph_hash)
 177     cgraph_hash = htab_create_ggc (10, hash_node, eq_node, NULL);
 178
 179   key.decl = decl;
 180
 181   slot = (struct cgraph_node **) htab_find_slot (cgraph_hash, &key, INSERT);
 182
 183   if (*slot)
 184     return *slot;
 185
 186   node = cgraph_create_node ();
 187   node->decl = decl;
 188   *slot = node;
 189   if (DECL_CONTEXT (decl) && TREE_CODE (DECL_CONTEXT (decl)) == FUNCTION_DECL)
 190     {
 191       node->origin = cgraph_node (DECL_CONTEXT (decl));
 192       node->next_nested = node->origin->nested;
 193       node->origin->nested = node;
 194     }
 195   return node;
 196 }
 197
 198 /* Return callgraph edge representing CALL_EXPR.  */
 199 struct cgraph_edge *
 200 cgraph_edge (struct cgraph_node *node, tree call_expr)
 201 {
 202   struct cgraph_edge *e;
 203
 204   /* This loop may turn out to be performance problem.  In such case adding
 205      hashtables into call nodes with very many edges is probably best
 206      solution.  It is not good idea to add pointer into CALL_EXPR itself
 207      because we want to make possible having multiple cgraph nodes representing
 208      different clones of the same body before the body is actually cloned.  */
 209   for (e = node->callees; e; e= e->next_callee)
 210     if (e->call_expr == call_expr)
 211       break;
 212   return e;
 213 }
 214
 215 /* Create edge from CALLER to CALLEE in the cgraph.  */
 216
 217 struct cgraph_edge *
 218 cgraph_create_edge (struct cgraph_node *caller, struct cgraph_node *callee,
 219                     tree call_expr)
 220 {
 221   struct cgraph_edge *edge = ggc_alloc (sizeof (struct cgraph_edge));
 222 #ifdef ENABLE_CHECKING
 223   struct cgraph_edge *e;
 224
 225   for (e = caller->callees; e; e = e->next_callee)
 226     if (e->call_expr == call_expr)
 227       abort ();
 228 #endif
 229
 230   if (TREE_CODE (call_expr) != CALL_EXPR)
 231     abort ();
 232
 233   if (!DECL_SAVED_TREE (callee->decl))
 234     edge->inline_failed = N_("function body not available");
 235   else if (callee->local.redefined_extern_inline)
 236     edge->inline_failed = N_("redefined extern inline functions are not "
 237                              "considered for inlining");
 238   else if (callee->local.inlinable)
 239     edge->inline_failed = N_("function not considered for inlining");
 240   else
 241     edge->inline_failed = N_("function not inlinable");
 242
 243   edge->aux = NULL;
 244
 245   edge->caller = caller;
 246   edge->callee = callee;
 247   edge->call_expr = call_expr;
 248   edge->next_caller = callee->callers;
 249   edge->next_callee = caller->callees;
 250   caller->callees = edge;
 251   callee->callers = edge;
 252   return edge;
 253 }
 254
 255 /* Remove the edge E the cgraph.  */
 256
 257 void
 258 cgraph_remove_edge (struct cgraph_edge *e)
 259 {
 260   struct cgraph_edge **edge, **edge2;
 261
 262   for (edge = &e->callee->callers; *edge && *edge != e;
 263        edge = &((*edge)->next_caller))
 264     continue;
 265   if (!*edge)
 266     abort ();
 267   *edge = (*edge)->next_caller;
 268   for (edge2 = &e->caller->callees; *edge2 && *edge2 != e;
 269        edge2 = &(*edge2)->next_callee)
 270     continue;
 271   if (!*edge2)
 272     abort ();
 273   *edge2 = (*edge2)->next_callee;
 274 }
 275
 276 /* Redirect callee of E to N.  The function does not update underlying
 277    call expression.  */
 278
 279 void
 280 cgraph_redirect_edge_callee (struct cgraph_edge *e, struct cgraph_node *n)
 281 {
 282   struct cgraph_edge **edge;
 283
 284   for (edge = &e->callee->callers; *edge && *edge != e;
 285        edge = &((*edge)->next_caller))
 286     continue;
 287   if (!*edge)
 288     abort ();
 289   *edge = (*edge)->next_caller;
 290   e->callee = n;
 291   e->next_caller = n->callers;
 292   n->callers = e;
 293 }
 294
 295 /* Remove the node from cgraph.  */
 296
 297 void
 298 cgraph_remove_node (struct cgraph_node *node)
 299 {
 300   void **slot;
 301   bool check_dead = 1;
 302
 303   while (node->callers)
 304     cgraph_remove_edge (node->callers);
 305   while (node->callees)
 306     cgraph_remove_edge (node->callees);
 307   while (node->nested)
 308     cgraph_remove_node (node->nested);
 309   if (node->origin)
 310     {
 311       struct cgraph_node **node2 = &node->origin->nested;
 312
 313       while (*node2 != node)
 314         node2 = &(*node2)->next_nested;
 315       *node2 = node->next_nested;
 316     }
 317   if (node->previous)
 318     node->previous->next = node->next;
 319   else
 320     cgraph_nodes = node->next;
 321   if (node->next)
 322     node->next->previous = node->previous;
 323   slot = htab_find_slot (cgraph_hash, node, NO_INSERT);
 324   if (*slot == node)
 325     {
 326       if (node->next_clone)
 327         *slot = node->next_clone;
 328       else
 329         {
 330           htab_clear_slot (cgraph_hash, slot);
 331           if (!dump_enabled_p (TDI_all))
 332             {
 333               DECL_SAVED_TREE (node->decl) = NULL;
 334               DECL_STRUCT_FUNCTION (node->decl) = NULL;
 335             }
 336           check_dead = false;
 337         }
 338     }
 339   else
 340     {
 341       struct cgraph_node *n;
 342
 343       for (n = *slot; n->next_clone != node; n = n->next_clone)
 344         continue;
 345       n->next_clone = node->next_clone;
 346     }
 347
 348   /* Work out whether we still need a function body (either there is inline
 349      clone or there is out of line function whose body is not written).  */
 350   if (check_dead && flag_unit_at_a_time)
 351     {
 352       struct cgraph_node *n;
 353
 354       for (n = *slot; n; n = n->next_clone)
 355         if (n->global.inlined_to
 356             || (!n->global.inlined_to
 357                 && !TREE_ASM_WRITTEN (n->decl) && !DECL_EXTERNAL (n->decl)))
 358           break;
 359       if (!n && !dump_enabled_p (TDI_all))
 360         {
 361           DECL_SAVED_TREE (node->decl) = NULL;
 362           DECL_STRUCT_FUNCTION (node->decl) = NULL;
 363         }
 364     }
 365   cgraph_n_nodes--;
 366   /* Do not free the structure itself so the walk over chain can continue.  */
 367 }
 368
 369 /* Notify finalize_compilation_unit that given node is reachable.  */
 370
 371 void
 372 cgraph_mark_reachable_node (struct cgraph_node *node)
 373 {
 374   if (!node->reachable && node->local.finalized)
 375     {
 376       notice_global_symbol (node->decl);
 377       node->reachable = 1;
 378
 379       node->next_needed = cgraph_nodes_queue;
 380       cgraph_nodes_queue = node;
 381     }
 382 }
 383
 384 /* Likewise indicate that a node is needed, i.e. reachable via some
 385    external means.  */
 386
 387 void
 388 cgraph_mark_needed_node (struct cgraph_node *node)
 389 {
 390   node->needed = 1;
 391   cgraph_mark_reachable_node (node);
 392 }
 393
 394 /* Return true when CALLER_DECL calls CALLEE_DECL.  */
 395
 396 bool
 397 cgraph_calls_p (tree caller_decl, tree callee_decl)
 398 {
 399   struct cgraph_node *caller = cgraph_node (caller_decl);
 400   struct cgraph_node *callee = cgraph_node (callee_decl);
 401   struct cgraph_edge *edge;
 402
 403   for (edge = callee->callers; edge && (edge)->caller != caller;
 404        edge = (edge->next_caller))
 405     continue;
 406   return edge != NULL;
 407 }
 408
 409 /* Return local info for the compiled function.  */
 410
 411 struct cgraph_local_info *
 412 cgraph_local_info (tree decl)
 413 {
 414   struct cgraph_node *node;
 415   if (TREE_CODE (decl) != FUNCTION_DECL)
 416     abort ();
 417   node = cgraph_node (decl);
 418   return &node->local;
 419 }
 420
 421 /* Return local info for the compiled function.  */
 422
 423 struct cgraph_global_info *
 424 cgraph_global_info (tree decl)
 425 {
 426   struct cgraph_node *node;
 427   if (TREE_CODE (decl) != FUNCTION_DECL || !cgraph_global_info_ready)
 428     abort ();
 429   node = cgraph_node (decl);
 430   return &node->global;
 431 }
 432
 433 /* Return local info for the compiled function.  */
 434
 435 struct cgraph_rtl_info *
 436 cgraph_rtl_info (tree decl)
 437 {
 438   struct cgraph_node *node;
 439   if (TREE_CODE (decl) != FUNCTION_DECL)
 440     abort ();
 441   node = cgraph_node (decl);
 442   if (decl != current_function_decl
 443       && !TREE_ASM_WRITTEN (node->decl))
 444     return NULL;
 445   return &node->rtl;
 446 }
 447
 448 /* Return name of the node used in debug output.  */
 449 const char *
 450 cgraph_node_name (struct cgraph_node *node)
 451 {
 452   return lang_hooks.decl_printable_name (node->decl, 2);
 453 }
 454
 455 /* Dump given cgraph node.  */
 456 void
 457 dump_cgraph_node (FILE *f, struct cgraph_node *node)
 458 {
 459   struct cgraph_edge *edge;
 460   fprintf (f, "%s/%i:", cgraph_node_name (node), node->uid);
 461   if (node->global.inlined_to)
 462     fprintf (f, " (inline copy in %s/%i)",
 463              cgraph_node_name (node->global.inlined_to),
 464              node->global.inlined_to->uid);
 465   if (node->local.self_insns)
 466     fprintf (f, " %i insns", node->local.self_insns);
 467   if (node->global.insns && node->global.insns != node->local.self_insns)
 468     fprintf (f, " (%i after inlining)", node->global.insns);
 469   if (node->origin)
 470     fprintf (f, " nested in: %s", cgraph_node_name (node->origin));
 471   if (node->needed)
 472     fprintf (f, " needed");
 473   else if (node->reachable)
 474     fprintf (f, " reachable");
 475   if (DECL_SAVED_TREE (node->decl))
 476     fprintf (f, " tree");
 477   if (node->output)
 478     fprintf (f, " output");
 479
 480   if (node->local.local)
 481     fprintf (f, " local");
 482   if (node->local.disregard_inline_limits)
 483     fprintf (f, " always_inline");
 484   else if (node->local.inlinable)
 485     fprintf (f, " inlinable");
 486   if (TREE_ASM_WRITTEN (node->decl))
 487     fprintf (f, " asm_written");
 488
 489   fprintf (f, "\n  called by: ");
 490   for (edge = node->callers; edge; edge = edge->next_caller)
 491     {
 492       fprintf (f, "%s/%i ", cgraph_node_name (edge->caller),
 493                edge->caller->uid);
 494       if (!edge->inline_failed)
 495         fprintf(f, "(inlined) ");
 496     }
 497
 498   fprintf (f, "\n  calls: ");
 499   for (edge = node->callees; edge; edge = edge->next_callee)
 500     {
 501       fprintf (f, "%s/%i ", cgraph_node_name (edge->callee),
 502                edge->callee->uid);
 503       if (!edge->inline_failed)
 504         fprintf(f, "(inlined) ");
 505     }
 506   fprintf (f, "\n");
 507 }
 508
 509 /* Dump the callgraph.  */
 510
 511 void
 512 dump_cgraph (FILE *f)
 513 {
 514   struct cgraph_node *node;
 515
 516   fprintf (f, "callgraph:\n\n");
 517   for (node = cgraph_nodes; node; node = node->next)
 518     dump_cgraph_node (f, node);
 519 }
 520
 521 /* Returns a hash code for P.  */
 522
 523 static hashval_t
 524 hash_varpool_node (const void *p)
 525 {
 526   const struct cgraph_varpool_node *n = p;
 527   return (hashval_t) DECL_UID (n->decl);
 528 }
 529
 530 /* Returns nonzero if P1 and P2 are equal.  */
 531
 532 static int
 533 eq_varpool_node (const void *p1, const void *p2)
 534 {
 535   const struct cgraph_varpool_node *n1 = p1, *n2 = p2;
 536   return DECL_UID (n1->decl) == DECL_UID (n2->decl);
 537 }
 538
 539 /* Return cgraph_varpool node assigned to DECL.  Create new one when needed.  */
 540 struct cgraph_varpool_node *
 541 cgraph_varpool_node (tree decl)
 542 {
 543   struct cgraph_varpool_node key, *node, **slot;
 544
 545   if (!DECL_P (decl) || TREE_CODE (decl) == FUNCTION_DECL)
 546     abort ();
 547
 548   if (!cgraph_varpool_hash)
 549     cgraph_varpool_hash = htab_create_ggc (10, hash_varpool_node,
 550                                            eq_varpool_node, NULL);
 551   key.decl = decl;
 552   slot = (struct cgraph_varpool_node **)
 553     htab_find_slot (cgraph_varpool_hash, &key, INSERT);
 554   if (*slot)
 555     return *slot;
 556   node = ggc_alloc_cleared (sizeof (*node));
 557   node->decl = decl;
 558   cgraph_varpool_n_nodes++;
 559   cgraph_varpool_nodes = node;
 560   *slot = node;
 561   return node;
 562 }
 563
 564 /* Set the DECL_ASSEMBLER_NAME and update cgraph hashtables.  */
 565 void
 566 change_decl_assembler_name (tree decl, tree name)
 567 {
 568   if (!DECL_ASSEMBLER_NAME_SET_P (decl))
 569     {
 570       SET_DECL_ASSEMBLER_NAME (decl, name);
 571       return;
 572     }
 573   if (name == DECL_ASSEMBLER_NAME (decl))
 574     return;
 575
 576   if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))
 577       && DECL_RTL_SET_P (decl))
 578     warning ("%D renamed after being referenced in assembly", decl);
 579
 580   SET_DECL_ASSEMBLER_NAME (decl, name);
 581 }
 582
 583 /* Notify finalize_compilation_unit that given node is reachable
 584    or needed.  */
 585 void
 586 cgraph_varpool_mark_needed_node (struct cgraph_varpool_node *node)
 587 {
 588   if (!node->needed && node->finalized)
 589     {
 590       node->next_needed = cgraph_varpool_nodes_queue;
 591       cgraph_varpool_nodes_queue = node;
 592       notice_global_symbol (node->decl);
 593     }
 594   node->needed = 1;
 595 }
 596
 597 void
 598 cgraph_varpool_finalize_decl (tree decl)
 599 {
 600   struct cgraph_varpool_node *node = cgraph_varpool_node (decl);
 601
 602   /* The first declaration of a variable that comes through this function
 603      decides whether it is global (in C, has external linkage)
 604      or local (in C, has internal linkage).  So do nothing more
 605      if this function has already run.  */
 606   if (node->finalized)
 607     return;
 608   if (node->needed)
 609     {
 610       node->next_needed = cgraph_varpool_nodes_queue;
 611       cgraph_varpool_nodes_queue = node;
 612       notice_global_symbol (decl);
 613     }
 614   node->finalized = true;
 615
 616   if (/* Externally visible variables must be output.  The exception are
 617          COMDAT functions that must be output only when they are needed.  */
 618       (TREE_PUBLIC (decl) && !DECL_COMDAT (decl))
 619       /* Function whose name is output to the assembler file must be produced.
 620          It is possible to assemble the name later after finalizing the function
 621          and the fact is noticed in assemble_name then.  */
 622       || (DECL_ASSEMBLER_NAME_SET_P (decl)
 623           && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl))))
 624     {
 625       cgraph_varpool_mark_needed_node (node);
 626     }
 627 }
 628
 629 bool
 630 cgraph_varpool_assemble_pending_decls (void)
 631 {
 632   bool changed = false;
 633
 634   while (cgraph_varpool_nodes_queue)
 635     {
 636       tree decl = cgraph_varpool_nodes_queue->decl;
 637       struct cgraph_varpool_node *node = cgraph_varpool_nodes_queue;
 638
 639       cgraph_varpool_nodes_queue = cgraph_varpool_nodes_queue->next_needed;
 640       if (!TREE_ASM_WRITTEN (decl))
 641         {
 642           assemble_variable (decl, 0, 1, 0);
 643           changed = true;
 644         }
 645       node->next_needed = NULL;
 646     }
 647   return changed;
 648 }
 649
 650 /* Return true when the DECL can possibly be inlined.  */
 651 bool
 652 cgraph_function_possibly_inlined_p (tree decl)
 653 {
 654   if (!cgraph_global_info_ready)
 655     return (DECL_INLINE (decl) && !flag_really_no_inline);
 656   return DECL_POSSIBLY_INLINED (decl);
 657 }
 658
 659 /* Create clone of E in the node N represented by CALL_EXPR the callgraph.  */
 660 struct cgraph_edge *
 661 cgraph_clone_edge (struct cgraph_edge *e, struct cgraph_node *n, tree call_expr)
 662 {
 663   struct cgraph_edge *new = cgraph_create_edge (n, e->callee, call_expr);
 664
 665   new->inline_failed = e->inline_failed;
 666   return new;
 667 }
 668
 669 /* Create node representing clone of N.  */
 670 struct cgraph_node *
 671 cgraph_clone_node (struct cgraph_node *n)
 672 {
 673   struct cgraph_node *new = cgraph_create_node ();
 674   struct cgraph_edge *e;
 675
 676   new->decl = n->decl;
 677   new->origin = n->origin;
 678   if (new->origin)
 679     {
 680       new->next_nested = new->origin->nested;
 681       new->origin->nested = new;
 682     }
 683   new->analyzed = n->analyzed;
 684   new->local = n->local;
 685   new->global = n->global;
 686   new->rtl = n->rtl;
 687
 688   for (e = n->callees;e; e=e->next_callee)
 689     cgraph_clone_edge (e, new, e->call_expr);
 690
 691   new->next_clone = n->next_clone;
 692   n->next_clone = new;
 693
 694   return new;
 695 }
 696 #include "gt-cgraph.h"