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