gcc/function.h

   1 /* Structure for saving state for a nested function.
   2    Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
   3    1999, 2000, 2003, 2004, 2005 Free Software Foundation, Inc.
   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_FUNCTION_H
  23 #define GCC_FUNCTION_H
  24
  25 #include "tree.h"
  26 #include "hashtab.h"
  27
  28 struct var_refs_queue GTY(())
  29 {
  30   rtx modified;
  31   enum machine_mode promoted_mode;
  32   int unsignedp;
  33   struct var_refs_queue *next;
  34 };
  35
  36 /* Stack of pending (incomplete) sequences saved by `start_sequence'.
  37    Each element describes one pending sequence.
  38    The main insn-chain is saved in the last element of the chain,
  39    unless the chain is empty.  */
  40
  41 struct sequence_stack GTY(())
  42 {
  43   /* First and last insns in the chain of the saved sequence.  */
  44   rtx first;
  45   rtx last;
  46   struct sequence_stack *next;
  47 };
  48
  49 extern struct sequence_stack *sequence_stack;
  50
  51 /* Stack of single obstacks.  */
  52
  53 struct simple_obstack_stack
  54 {
  55   struct obstack *obstack;
  56   struct simple_obstack_stack *next;
  57 };
  58 \f
  59 struct emit_status GTY(())
  60 {
  61   /* This is reset to LAST_VIRTUAL_REGISTER + 1 at the start of each function.
  62      After rtl generation, it is 1 plus the largest register number used.  */
  63   int x_reg_rtx_no;
  64
  65   /* Lowest label number in current function.  */
  66   int x_first_label_num;
  67
  68   /* The ends of the doubly-linked chain of rtl for the current function.
  69      Both are reset to null at the start of rtl generation for the function.
  70
  71      start_sequence saves both of these on `sequence_stack' and then starts
  72      a new, nested sequence of insns.  */
  73   rtx x_first_insn;
  74   rtx x_last_insn;
  75
  76   /* Stack of pending (incomplete) sequences saved by `start_sequence'.
  77      Each element describes one pending sequence.
  78      The main insn-chain is saved in the last element of the chain,
  79      unless the chain is empty.  */
  80   struct sequence_stack *sequence_stack;
  81
  82   /* INSN_UID for next insn emitted.
  83      Reset to 1 for each function compiled.  */
  84   int x_cur_insn_uid;
  85
  86   /* Location the last line-number NOTE emitted.
  87      This is used to avoid generating duplicates.  */
  88   location_t x_last_location;
  89
  90   /* The length of the regno_pointer_align, regno_decl, and x_regno_reg_rtx
  91      vectors.  Since these vectors are needed during the expansion phase when
  92      the total number of registers in the function is not yet known, the
  93      vectors are copied and made bigger when necessary.  */
  94   int regno_pointer_align_length;
  95
  96   /* Indexed by pseudo register number, if nonzero gives the known alignment
  97      for that pseudo (if REG_POINTER is set in x_regno_reg_rtx).
  98      Allocated in parallel with x_regno_reg_rtx.  */
  99   unsigned char * GTY ((length ("%h.x_reg_rtx_no")))
 100     regno_pointer_align;
 101
 102   /* Indexed by pseudo register number, gives the rtx for that pseudo.
 103      Allocated in parallel with regno_pointer_align.  */
 104   rtx * GTY ((length ("%h.x_reg_rtx_no"))) x_regno_reg_rtx;
 105 };
 106
 107 /* For backward compatibility... eventually these should all go away.  */
 108 #define reg_rtx_no (cfun->emit->x_reg_rtx_no)
 109 #define regno_reg_rtx (cfun->emit->x_regno_reg_rtx)
 110 #define seq_stack (cfun->emit->sequence_stack)
 111
 112 #define REGNO_POINTER_ALIGN(REGNO) (cfun->emit->regno_pointer_align[REGNO])
 113
 114 struct expr_status GTY(())
 115 {
 116   /* Number of units that we should eventually pop off the stack.
 117      These are the arguments to function calls that have already returned.  */
 118   int x_pending_stack_adjust;
 119
 120   /* Under some ABIs, it is the caller's responsibility to pop arguments
 121      pushed for function calls.  A naive implementation would simply pop
 122      the arguments immediately after each call.  However, if several
 123      function calls are made in a row, it is typically cheaper to pop
 124      all the arguments after all of the calls are complete since a
 125      single pop instruction can be used.  Therefore, GCC attempts to
 126      defer popping the arguments until absolutely necessary.  (For
 127      example, at the end of a conditional, the arguments must be popped,
 128      since code outside the conditional won't know whether or not the
 129      arguments need to be popped.)
 130
 131      When INHIBIT_DEFER_POP is nonzero, however, the compiler does not
 132      attempt to defer pops.  Instead, the stack is popped immediately
 133      after each call.  Rather then setting this variable directly, use
 134      NO_DEFER_POP and OK_DEFER_POP.  */
 135   int x_inhibit_defer_pop;
 136
 137   /* If PREFERRED_STACK_BOUNDARY and PUSH_ROUNDING are defined, the stack
 138      boundary can be momentarily unaligned while pushing the arguments.
 139      Record the delta since last aligned boundary here in order to get
 140      stack alignment in the nested function calls working right.  */
 141   int x_stack_pointer_delta;
 142
 143   /* Nonzero means __builtin_saveregs has already been done in this function.
 144      The value is the pseudoreg containing the value __builtin_saveregs
 145      returned.  */
 146   rtx x_saveregs_value;
 147
 148   /* Similarly for __builtin_apply_args.  */
 149   rtx x_apply_args_value;
 150
 151   /* List of labels that must never be deleted.  */
 152   rtx x_forced_labels;
 153 };
 154
 155 #define pending_stack_adjust (cfun->expr->x_pending_stack_adjust)
 156 #define inhibit_defer_pop (cfun->expr->x_inhibit_defer_pop)
 157 #define saveregs_value (cfun->expr->x_saveregs_value)
 158 #define apply_args_value (cfun->expr->x_apply_args_value)
 159 #define forced_labels (cfun->expr->x_forced_labels)
 160 #define stack_pointer_delta (cfun->expr->x_stack_pointer_delta)
 161
 162 struct gimple_df;
 163 struct temp_slot;
 164 typedef struct temp_slot *temp_slot_p;
 165
 166 DEF_VEC_P(temp_slot_p);
 167 DEF_VEC_ALLOC_P(temp_slot_p,gc);
 168
 169 enum function_frequency {
 170   /* This function most likely won't be executed at all.
 171      (set only when profile feedback is available).  */
 172   FUNCTION_FREQUENCY_UNLIKELY_EXECUTED,
 173   /* The default value.  */
 174   FUNCTION_FREQUENCY_NORMAL,
 175   /* Optimize this function hard
 176      (set only when profile feedback is available).  */
 177   FUNCTION_FREQUENCY_HOT
 178 };
 179
 180 /* This structure can save all the important global and static variables
 181    describing the status of the current function.  */
 182
 183 struct function GTY(())
 184 {
 185   struct eh_status *eh;
 186   struct expr_status *expr;
 187   struct emit_status *emit;
 188   struct varasm_status *varasm;
 189
 190   /* The control flow graph for this function.  */
 191   struct control_flow_graph *cfg;
 192   /* SSA and dataflow information.  */
 193   struct gimple_df *gimple_df;
 194
 195   /* The loops in this function.  */
 196   struct loops * GTY((skip)) x_current_loops;
 197
 198   /* Value histograms attached to particular statements.  */
 199   htab_t GTY((skip)) value_histograms;
 200
 201   /* For function.c.  */
 202
 203   /* Points to the FUNCTION_DECL of this function.  */
 204   tree decl;
 205
 206   /* Function containing this function, if any.  */
 207   struct function *outer;
 208
 209   /* Number of bytes of args popped by function being compiled on its return.
 210      Zero if no bytes are to be popped.
 211      May affect compilation of return insn or of function epilogue.  */
 212   int pops_args;
 213
 214   /* If function's args have a fixed size, this is that size, in bytes.
 215      Otherwise, it is -1.
 216      May affect compilation of return insn or of function epilogue.  */
 217   int args_size;
 218
 219   /* # bytes the prologue should push and pretend that the caller pushed them.
 220      The prologue must do this, but only if parms can be passed in
 221      registers.  */
 222   int pretend_args_size;
 223
 224   /* # of bytes of outgoing arguments.  If ACCUMULATE_OUTGOING_ARGS is
 225      defined, the needed space is pushed by the prologue.  */
 226   int outgoing_args_size;
 227
 228   /* This is the offset from the arg pointer to the place where the first
 229      anonymous arg can be found, if there is one.  */
 230   rtx arg_offset_rtx;
 231
 232   /* Quantities of various kinds of registers
 233      used for the current function's args.  */
 234   CUMULATIVE_ARGS args_info;
 235
 236   /* If nonzero, an RTL expression for the location at which the current
 237      function returns its result.  If the current function returns its
 238      result in a register, current_function_return_rtx will always be
 239      the hard register containing the result.  */
 240   rtx return_rtx;
 241
 242   /* The arg pointer hard register, or the pseudo into which it was copied.  */
 243   rtx internal_arg_pointer;
 244
 245   /* Opaque pointer used by get_hard_reg_initial_val and
 246      has_hard_reg_initial_val (see integrate.[hc]).  */
 247   struct initial_value_struct *hard_reg_initial_vals;
 248
 249   /* List (chain of EXPR_LIST) of labels heading the current handlers for
 250      nonlocal gotos.  */
 251   rtx x_nonlocal_goto_handler_labels;
 252
 253   /* Label that will go on function epilogue.
 254      Jumping to this label serves as a "return" instruction
 255      on machines which require execution of the epilogue on all returns.  */
 256   rtx x_return_label;
 257
 258   /* Label that will go on the end of function epilogue.
 259      Jumping to this label serves as a "naked return" instruction
 260      on machines which require execution of the epilogue on all returns.  */
 261   rtx x_naked_return_label;
 262
 263   /* List (chain of EXPR_LISTs) of all stack slots in this function.
 264      Made for the sake of unshare_all_rtl.  */
 265   rtx x_stack_slot_list;
 266
 267   /* Place after which to insert the tail_recursion_label if we need one.  */
 268   rtx x_stack_check_probe_note;
 269
 270   /* Location at which to save the argument pointer if it will need to be
 271      referenced.  There are two cases where this is done: if nonlocal gotos
 272      exist, or if vars stored at an offset from the argument pointer will be
 273      needed by inner routines.  */
 274   rtx x_arg_pointer_save_area;
 275
 276   /* Offset to end of allocated area of stack frame.
 277      If stack grows down, this is the address of the last stack slot allocated.
 278      If stack grows up, this is the address for the next slot.  */
 279   HOST_WIDE_INT x_frame_offset;
 280
 281   /* A PARM_DECL that should contain the static chain for this function.
 282      It will be initialized at the beginning of the function.  */
 283   tree static_chain_decl;
 284
 285   /* An expression that contains the non-local goto save area.  The first
 286      word is the saved frame pointer and the second is the saved stack
 287      pointer.  */
 288   tree nonlocal_goto_save_area;
 289
 290   /* Insn after which register parms and SAVE_EXPRs are born, if nonopt.  */
 291   rtx x_parm_birth_insn;
 292
 293   /* List of all used temporaries allocated, by level.  */
 294   VEC(temp_slot_p,gc) *x_used_temp_slots;
 295
 296   /* List of available temp slots.  */
 297   struct temp_slot *x_avail_temp_slots;
 298
 299   /* This slot is initialized as 0 and is added to
 300      during the nested function.  */
 301   struct var_refs_queue *fixup_var_refs_queue;
 302
 303   /* Current nesting level for temporaries.  */
 304   int x_temp_slot_level;
 305
 306   /* Highest label number in current function.  */
 307   int inl_max_label_num;
 308
 309   /* Function sequence number for profiling, debugging, etc.  */
 310   int funcdef_no;
 311
 312   /* For flow.c.  */
 313
 314   /* Highest loop depth seen so far in loop analysis.  Used in flow.c
 315      for the "failure strategy" when doing liveness analysis starting
 316      with non-empty initial sets.  */
 317   int max_loop_depth;
 318
 319   /* For md files.  */
 320
 321   /* tm.h can use this to store whatever it likes.  */
 322   struct machine_function * GTY ((maybe_undef)) machine;
 323
 324   /* The largest alignment of slot allocated on the stack.  */
 325   unsigned int stack_alignment_needed;
 326
 327   /* Preferred alignment of the end of stack frame.  */
 328   unsigned int preferred_stack_boundary;
 329
 330   /* Language-specific code can use this to store whatever it likes.  */
 331   struct language_function * language;
 332
 333   /* Used types hash table.  */
 334   htab_t GTY ((param_is (union tree_node))) used_types_hash;
 335
 336   /* For reorg.  */
 337
 338   /* If some insns can be deferred to the delay slots of the epilogue, the
 339      delay list for them is recorded here.  */
 340   rtx epilogue_delay_list;
 341
 342   /* Maximal number of entities in the single jumptable.  Used to estimate
 343      final flowgraph size.  */
 344   int max_jumptable_ents;
 345
 346   /* UIDs for LABEL_DECLs.  */
 347   int last_label_uid;
 348
 349   /* Line number of the end of the function.  */
 350   location_t function_end_locus;
 351
 352   /* Array mapping insn uids to blocks.  */
 353   VEC(tree,gc) *ib_boundaries_block;
 354
 355   /* The variables unexpanded so far.  */
 356   tree unexpanded_var_list;
 357
 358   /* Assembly labels for the hot and cold text sections, to
 359      be used by debugger functions for determining the size of text
 360      sections.  */
 361
 362   const char *hot_section_label;
 363   const char *cold_section_label;
 364   const char *hot_section_end_label;
 365   const char *cold_section_end_label;
 366
 367   /* String to be used for name of cold text sections, via
 368      targetm.asm_out.named_section.  */
 369
 370   const char *unlikely_text_section_name;
 371
 372   /* A variable living at the top of the frame that holds a known value.
 373      Used for detecting stack clobbers.  */
 374   tree stack_protect_guard;
 375
 376   /* Properties used by the pass manager.  */
 377   unsigned int curr_properties;
 378   unsigned int last_verified;
 379
 380   /* Collected bit flags.  */
 381
 382   /* Nonzero if function being compiled needs to be given an address
 383      where the value should be stored.  */
 384   unsigned int returns_struct : 1;
 385
 386   /* Nonzero if function being compiled needs to
 387      return the address of where it has put a structure value.  */
 388   unsigned int returns_pcc_struct : 1;
 389
 390   /* Nonzero if the current function returns a pointer type.  */
 391   unsigned int returns_pointer : 1;
 392
 393   /* Nonzero if function being compiled can call setjmp.  */
 394   unsigned int calls_setjmp : 1;
 395
 396   /* Nonzero if function being compiled can call alloca,
 397      either as a subroutine or builtin.  */
 398   unsigned int calls_alloca : 1;
 399
 400   /* Nonzero if function being compiled called builtin_return_addr or
 401      builtin_frame_address with nonzero count.  */
 402   unsigned int accesses_prior_frames : 1;
 403
 404   /* Nonzero if the function calls __builtin_eh_return.  */
 405   unsigned int calls_eh_return : 1;
 406
 407   /* Nonzero if function being compiled receives nonlocal gotos
 408      from nested functions.  */
 409   unsigned int has_nonlocal_label : 1;
 410
 411   /* Nonzero if function being compiled has nonlocal gotos to parent
 412      function.  */
 413   unsigned int has_nonlocal_goto : 1;
 414
 415   /* Nonzero if the current function is a thunk, i.e., a lightweight
 416      function implemented by the output_mi_thunk hook) that just
 417      adjusts one of its arguments and forwards to another
 418      function.  */
 419   unsigned int is_thunk : 1;
 420
 421   /* This bit is used by the exception handling logic.  It is set if all
 422      calls (if any) are sibling calls.  Such functions do not have to
 423      have EH tables generated, as they cannot throw.  A call to such a
 424      function, however, should be treated as throwing if any of its callees
 425      can throw.  */
 426   unsigned int all_throwers_are_sibcalls : 1;
 427
 428   /* Nonzero if profiling code should be generated.  */
 429   unsigned int profile : 1;
 430
 431   /* Nonzero if stack limit checking should be enabled in the current
 432      function.  */
 433   unsigned int limit_stack : 1;
 434
 435   /* Nonzero if current function uses stdarg.h or equivalent.  */
 436   unsigned int stdarg : 1;
 437
 438   /* Nonzero if the back-end should not keep track of expressions that
 439      determine the size of variable-sized objects.  Normally, such
 440      expressions are saved away, and then expanded when the next
 441      function is started.  For example, if a parameter has a
 442      variable-sized type, then the size of the parameter is computed
 443      when the function body is entered.  However, some front-ends do
 444      not desire this behavior.  */
 445   unsigned int x_dont_save_pending_sizes_p : 1;
 446
 447   /* Nonzero if the current function uses the constant pool.  */
 448   unsigned int uses_const_pool : 1;
 449
 450   /* Nonzero if the current function uses pic_offset_table_rtx.  */
 451   unsigned int uses_pic_offset_table : 1;
 452
 453   /* Nonzero if the current function needs an lsda for exception handling.  */
 454   unsigned int uses_eh_lsda : 1;
 455
 456   /* Nonzero if code to initialize arg_pointer_save_area has been emitted.  */
 457   unsigned int arg_pointer_save_area_init : 1;
 458
 459   unsigned int after_inlining : 1;
 460
 461   /* Set when the call to function itself has been emit.  */
 462   unsigned int recursive_call_emit : 1;
 463
 464   /* Set when the tail call has been produced.  */
 465   unsigned int tail_call_emit : 1;
 466
 467   /* How commonly executed the function is.  Initialized during branch
 468      probabilities pass.  */
 469   ENUM_BITFIELD (function_frequency) function_frequency : 2;
 470
 471   /* Number of units of general registers that need saving in stdarg
 472      function.  What unit is depends on the backend, either it is number
 473      of bytes, or it can be number of registers.  */
 474   unsigned int va_list_gpr_size : 8;
 475
 476   /* Number of units of floating point registers that need saving in stdarg
 477      function.  */
 478   unsigned int va_list_fpr_size : 8;
 479
 480   /* FIXME tuples: This bit is temporarily here to mark when a
 481      function has been gimplified, so we can make sure we're not
 482      creating non GIMPLE tuples after gimplification.  */
 483   unsigned gimplified : 1;
 484 };
 485
 486 /* If va_list_[gf]pr_size is set to this, it means we don't know how
 487    many units need to be saved.  */
 488 #define VA_LIST_MAX_GPR_SIZE    255
 489 #define VA_LIST_MAX_FPR_SIZE    255
 490
 491 /* The function currently being compiled.  */
 492 extern GTY(()) struct function *cfun;
 493
 494 /* Pointer to chain of `struct function' for containing functions.  */
 495 extern GTY(()) struct function *outer_function_chain;
 496
 497 /* Nonzero if we've already converted virtual regs to hard regs.  */
 498 extern int virtuals_instantiated;
 499
 500 /* Nonzero if at least one trampoline has been created.  */
 501 extern int trampolines_created;
 502
 503 /* For backward compatibility... eventually these should all go away.  */
 504 #define current_function_pops_args (cfun->pops_args)
 505 #define current_function_returns_struct (cfun->returns_struct)
 506 #define current_function_returns_pcc_struct (cfun->returns_pcc_struct)
 507 #define current_function_returns_pointer (cfun->returns_pointer)
 508 #define current_function_calls_setjmp (cfun->calls_setjmp)
 509 #define current_function_calls_alloca (cfun->calls_alloca)
 510 #define current_function_accesses_prior_frames (cfun->accesses_prior_frames)
 511 #define current_function_calls_eh_return (cfun->calls_eh_return)
 512 #define current_function_is_thunk (cfun->is_thunk)
 513 #define current_function_args_info (cfun->args_info)
 514 #define current_function_args_size (cfun->args_size)
 515 #define current_function_pretend_args_size (cfun->pretend_args_size)
 516 #define current_function_outgoing_args_size (cfun->outgoing_args_size)
 517 #define current_function_arg_offset_rtx (cfun->arg_offset_rtx)
 518 #define current_function_stdarg (cfun->stdarg)
 519 #define current_function_internal_arg_pointer (cfun->internal_arg_pointer)
 520 #define current_function_return_rtx (cfun->return_rtx)
 521 #define current_function_profile (cfun->profile)
 522 #define current_function_funcdef_no (cfun->funcdef_no)
 523 #define current_function_limit_stack (cfun->limit_stack)
 524 #define current_function_uses_pic_offset_table (cfun->uses_pic_offset_table)
 525 #define current_function_uses_const_pool (cfun->uses_const_pool)
 526 #define current_function_epilogue_delay_list (cfun->epilogue_delay_list)
 527 #define current_function_has_nonlocal_label (cfun->has_nonlocal_label)
 528 #define current_function_has_nonlocal_goto (cfun->has_nonlocal_goto)
 529
 530 #define return_label (cfun->x_return_label)
 531 #define naked_return_label (cfun->x_naked_return_label)
 532 #define stack_slot_list (cfun->x_stack_slot_list)
 533 #define parm_birth_insn (cfun->x_parm_birth_insn)
 534 #define frame_offset (cfun->x_frame_offset)
 535 #define stack_check_probe_note (cfun->x_stack_check_probe_note)
 536 #define arg_pointer_save_area (cfun->x_arg_pointer_save_area)
 537 #define used_temp_slots (cfun->x_used_temp_slots)
 538 #define avail_temp_slots (cfun->x_avail_temp_slots)
 539 #define temp_slot_level (cfun->x_temp_slot_level)
 540 #define nonlocal_goto_handler_labels (cfun->x_nonlocal_goto_handler_labels)
 541 #define current_loops (cfun->x_current_loops)
 542 #define VALUE_HISTOGRAMS(fun) (fun)->value_histograms
 543
 544 /* Given a function decl for a containing function,
 545    return the `struct function' for it.  */
 546 struct function *find_function_data (tree);
 547
 548 /* Identify BLOCKs referenced by more than one NOTE_INSN_BLOCK_{BEG,END},
 549    and create duplicate blocks.  */
 550 extern void reorder_blocks (void);
 551
 552 /* Set BLOCK_NUMBER for all the blocks in FN.  */
 553 extern void number_blocks (tree);
 554
 555 extern void clear_block_marks (tree);
 556 extern tree blocks_nreverse (tree);
 557 extern void reset_block_changes (void);
 558 extern void record_block_change (tree);
 559 extern void finalize_block_changes (void);
 560 extern void check_block_change (rtx, tree *);
 561 extern void free_block_changes (void);
 562
 563 /* Return size needed for stack frame based on slots so far allocated.
 564    This size counts from zero.  It is not rounded to STACK_BOUNDARY;
 565    the caller may have to do that.  */
 566 extern HOST_WIDE_INT get_frame_size (void);
 567
 568 /* Issue an error message and return TRUE if frame OFFSET overflows in
 569    the signed target pointer arithmetics for function FUNC.  Otherwise
 570    return FALSE.  */
 571 extern bool frame_offset_overflow (HOST_WIDE_INT, tree);
 572
 573 /* A pointer to a function to create target specific, per-function
 574    data structures.  */
 575 extern struct machine_function * (*init_machine_status) (void);
 576
 577 /* Save and restore status information for a nested function.  */
 578 extern void free_after_parsing (struct function *);
 579 extern void free_after_compilation (struct function *);
 580
 581 extern void init_varasm_status (struct function *);
 582
 583 #ifdef RTX_CODE
 584 extern void diddle_return_value (void (*)(rtx, void*), void*);
 585 extern void clobber_return_register (void);
 586 #endif
 587
 588 extern rtx get_arg_pointer_save_area (struct function *);
 589
 590 /* Returns the name of the current function.  */
 591 extern const char *current_function_name (void);
 592
 593 extern void do_warn_unused_parameter (tree);
 594
 595 extern bool pass_by_reference (CUMULATIVE_ARGS *, enum machine_mode,
 596                                tree, bool);
 597 extern bool reference_callee_copied (CUMULATIVE_ARGS *, enum machine_mode,
 598                                      tree, bool);
 599
 600 extern void used_types_insert (tree);
 601
 602 #endif  /* GCC_FUNCTION_H */