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, 2006, 2007, 2008
   4    Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef GCC_FUNCTION_H
  23 #define GCC_FUNCTION_H
  24
  25 #include "tree.h"
  26 #include "hashtab.h"
  27
  28 /* Stack of pending (incomplete) sequences saved by `start_sequence'.
  29    Each element describes one pending sequence.
  30    The main insn-chain is saved in the last element of the chain,
  31    unless the chain is empty.  */
  32
  33 struct sequence_stack GTY(())
  34 {
  35   /* First and last insns in the chain of the saved sequence.  */
  36   rtx first;
  37   rtx last;
  38   struct sequence_stack *next;
  39 };
  40 \f
  41 struct emit_status GTY(())
  42 {
  43   /* This is reset to LAST_VIRTUAL_REGISTER + 1 at the start of each function.
  44      After rtl generation, it is 1 plus the largest register number used.  */
  45   int x_reg_rtx_no;
  46
  47   /* Lowest label number in current function.  */
  48   int x_first_label_num;
  49
  50   /* The ends of the doubly-linked chain of rtl for the current function.
  51      Both are reset to null at the start of rtl generation for the function.
  52
  53      start_sequence saves both of these on `sequence_stack' and then starts
  54      a new, nested sequence of insns.  */
  55   rtx x_first_insn;
  56   rtx x_last_insn;
  57
  58   /* Stack of pending (incomplete) sequences saved by `start_sequence'.
  59      Each element describes one pending sequence.
  60      The main insn-chain is saved in the last element of the chain,
  61      unless the chain is empty.  */
  62   struct sequence_stack *sequence_stack;
  63
  64   /* INSN_UID for next insn emitted.
  65      Reset to 1 for each function compiled.  */
  66   int x_cur_insn_uid;
  67
  68   /* Location the last line-number NOTE emitted.
  69      This is used to avoid generating duplicates.  */
  70   location_t x_last_location;
  71
  72   /* The length of the regno_pointer_align, regno_decl, and x_regno_reg_rtx
  73      vectors.  Since these vectors are needed during the expansion phase when
  74      the total number of registers in the function is not yet known, the
  75      vectors are copied and made bigger when necessary.  */
  76   int regno_pointer_align_length;
  77
  78   /* Indexed by pseudo register number, if nonzero gives the known alignment
  79      for that pseudo (if REG_POINTER is set in x_regno_reg_rtx).
  80      Allocated in parallel with x_regno_reg_rtx.  */
  81   unsigned char * GTY((skip)) regno_pointer_align;
  82 };
  83
  84
  85 /* Indexed by pseudo register number, gives the rtx for that pseudo.
  86    Allocated in parallel with regno_pointer_align.
  87    FIXME: We could put it into emit_status struct, but gengtype is not able to deal
  88    with length attribute nested in top level structures.  */
  89
  90 extern GTY ((length ("crtl->emit.x_reg_rtx_no"))) rtx * regno_reg_rtx;
  91
  92 /* For backward compatibility... eventually these should all go away.  */
  93 #define reg_rtx_no (crtl->emit.x_reg_rtx_no)
  94 #define seq_stack (crtl->emit.sequence_stack)
  95
  96 #define REGNO_POINTER_ALIGN(REGNO) (crtl->emit.regno_pointer_align[REGNO])
  97
  98 struct expr_status GTY(())
  99 {
 100   /* Number of units that we should eventually pop off the stack.
 101      These are the arguments to function calls that have already returned.  */
 102   int x_pending_stack_adjust;
 103
 104   /* Under some ABIs, it is the caller's responsibility to pop arguments
 105      pushed for function calls.  A naive implementation would simply pop
 106      the arguments immediately after each call.  However, if several
 107      function calls are made in a row, it is typically cheaper to pop
 108      all the arguments after all of the calls are complete since a
 109      single pop instruction can be used.  Therefore, GCC attempts to
 110      defer popping the arguments until absolutely necessary.  (For
 111      example, at the end of a conditional, the arguments must be popped,
 112      since code outside the conditional won't know whether or not the
 113      arguments need to be popped.)
 114
 115      When INHIBIT_DEFER_POP is nonzero, however, the compiler does not
 116      attempt to defer pops.  Instead, the stack is popped immediately
 117      after each call.  Rather then setting this variable directly, use
 118      NO_DEFER_POP and OK_DEFER_POP.  */
 119   int x_inhibit_defer_pop;
 120
 121   /* If PREFERRED_STACK_BOUNDARY and PUSH_ROUNDING are defined, the stack
 122      boundary can be momentarily unaligned while pushing the arguments.
 123      Record the delta since last aligned boundary here in order to get
 124      stack alignment in the nested function calls working right.  */
 125   int x_stack_pointer_delta;
 126
 127   /* Nonzero means __builtin_saveregs has already been done in this function.
 128      The value is the pseudoreg containing the value __builtin_saveregs
 129      returned.  */
 130   rtx x_saveregs_value;
 131
 132   /* Similarly for __builtin_apply_args.  */
 133   rtx x_apply_args_value;
 134
 135   /* List of labels that must never be deleted.  */
 136   rtx x_forced_labels;
 137 };
 138
 139 #define pending_stack_adjust (crtl->expr.x_pending_stack_adjust)
 140 #define inhibit_defer_pop (crtl->expr.x_inhibit_defer_pop)
 141 #define saveregs_value (crtl->expr.x_saveregs_value)
 142 #define apply_args_value (crtl->expr.x_apply_args_value)
 143 #define forced_labels (crtl->expr.x_forced_labels)
 144 #define stack_pointer_delta (crtl->expr.x_stack_pointer_delta)
 145
 146 struct gimple_df;
 147 struct temp_slot;
 148 typedef struct temp_slot *temp_slot_p;
 149
 150 DEF_VEC_P(temp_slot_p);
 151 DEF_VEC_ALLOC_P(temp_slot_p,gc);
 152
 153 enum function_frequency {
 154   /* This function most likely won't be executed at all.
 155      (set only when profile feedback is available or via function attribute). */
 156   FUNCTION_FREQUENCY_UNLIKELY_EXECUTED,
 157   /* The default value.  */
 158   FUNCTION_FREQUENCY_NORMAL,
 159   /* Optimize this function hard
 160      (set only when profile feedback is available or via function attribute). */
 161   FUNCTION_FREQUENCY_HOT
 162 };
 163
 164 struct varasm_status GTY(())
 165 {
 166   /* If we're using a per-function constant pool, this is it.  */
 167   struct rtx_constant_pool *pool;
 168
 169   /* Number of tree-constants deferred during the expansion of this
 170      function.  */
 171   unsigned int deferred_constants;
 172 };
 173
 174 /* Information mainlined about RTL representation of incoming arguments.  */
 175 struct incoming_args GTY(())
 176 {
 177   /* Number of bytes of args popped by function being compiled on its return.
 178      Zero if no bytes are to be popped.
 179      May affect compilation of return insn or of function epilogue.  */
 180   int pops_args;
 181
 182   /* If function's args have a fixed size, this is that size, in bytes.
 183      Otherwise, it is -1.
 184      May affect compilation of return insn or of function epilogue.  */
 185   int size;
 186
 187   /* # bytes the prologue should push and pretend that the caller pushed them.
 188      The prologue must do this, but only if parms can be passed in
 189      registers.  */
 190   int pretend_args_size;
 191
 192   /* This is the offset from the arg pointer to the place where the first
 193      anonymous arg can be found, if there is one.  */
 194   rtx arg_offset_rtx;
 195
 196   /* Quantities of various kinds of registers
 197      used for the current function's args.  */
 198   CUMULATIVE_ARGS info;
 199
 200   /* The arg pointer hard register, or the pseudo into which it was copied.  */
 201   rtx internal_arg_pointer;
 202 };
 203
 204 /* Data for function partitioning.  */
 205 struct function_subsections GTY(())
 206 {
 207   /* Assembly labels for the hot and cold text sections, to
 208      be used by debugger functions for determining the size of text
 209      sections.  */
 210
 211   const char *hot_section_label;
 212   const char *cold_section_label;
 213   const char *hot_section_end_label;
 214   const char *cold_section_end_label;
 215
 216   /* String to be used for name of cold text sections, via
 217      targetm.asm_out.named_section.  */
 218
 219   const char *unlikely_text_section_name;
 220 };
 221
 222 /* Datastructures maintained for currently processed function in RTL form.  */
 223 struct rtl_data GTY(())
 224 {
 225   struct expr_status expr;
 226   struct emit_status emit;
 227   struct varasm_status varasm;
 228   struct incoming_args args;
 229   struct function_subsections subsections;
 230
 231   /* For function.c  */
 232
 233   /* # of bytes of outgoing arguments.  If ACCUMULATE_OUTGOING_ARGS is
 234      defined, the needed space is pushed by the prologue.  */
 235   int outgoing_args_size;
 236
 237   /* If nonzero, an RTL expression for the location at which the current
 238      function returns its result.  If the current function returns its
 239      result in a register, current_function_return_rtx will always be
 240      the hard register containing the result.  */
 241   rtx return_rtx;
 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_crtl->  */
 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   /* Insn after which register parms and SAVE_EXPRs are born, if nonopt.  */
 280   rtx x_parm_birth_insn;
 281
 282   /* List of all used temporaries allocated, by level.  */
 283   VEC(temp_slot_p,gc) *x_used_temp_slots;
 284
 285   /* List of available temp slots.  */
 286   struct temp_slot *x_avail_temp_slots;
 287
 288   /* Current nesting level for temporaries.  */
 289   int x_temp_slot_level;
 290
 291 };
 292
 293 #define return_label (crtl->x_return_label)
 294 #define naked_return_label (crtl->x_naked_return_label)
 295 #define stack_slot_list (crtl->x_stack_slot_list)
 296 #define parm_birth_insn (crtl->x_parm_birth_insn)
 297 #define frame_offset (crtl->x_frame_offset)
 298 #define stack_check_probe_note (crtl->x_stack_check_probe_note)
 299 #define arg_pointer_save_area (crtl->x_arg_pointer_save_area)
 300 #define used_temp_slots (crtl->x_used_temp_slots)
 301 #define avail_temp_slots (crtl->x_avail_temp_slots)
 302 #define temp_slot_level (crtl->x_temp_slot_level)
 303 #define nonlocal_goto_handler_labels (crtl->x_nonlocal_goto_handler_labels)
 304
 305 extern GTY(()) struct rtl_data x_rtl;
 306
 307 /* Accestor to RTL datastructures.  We keep them statically allocated now since
 308    we never keep multiple functions.  For threaded compiler we might however
 309    want to do differntly.  */
 310 #define crtl (&x_rtl)
 311
 312 /* This structure can save all the important global and static variables
 313    describing the status of the current function.  */
 314
 315 struct function GTY(())
 316 {
 317   struct eh_status *eh;
 318
 319   /* The control flow graph for this function.  */
 320   struct control_flow_graph *cfg;
 321   /* SSA and dataflow information.  */
 322   struct gimple_df *gimple_df;
 323
 324   /* The loops in this function.  */
 325   struct loops *x_current_loops;
 326
 327   /* Value histograms attached to particular statements.  */
 328   htab_t GTY((skip)) value_histograms;
 329
 330   /* For function.c.  */
 331
 332   /* Points to the FUNCTION_DECL of this function.  */
 333   tree decl;
 334
 335   /* Function containing this function, if any.  */
 336   struct function *outer;
 337
 338   /* A PARM_DECL that should contain the static chain for this function.
 339      It will be initialized at the beginning of the function.  */
 340   tree static_chain_decl;
 341
 342   /* An expression that contains the non-local goto save area.  The first
 343      word is the saved frame pointer and the second is the saved stack
 344      pointer.  */
 345   tree nonlocal_goto_save_area;
 346
 347   /* Function sequence number for profiling, debugging, etc.  */
 348   int funcdef_no;
 349
 350   /* For md files.  */
 351
 352   /* tm.h can use this to store whatever it likes.  */
 353   struct machine_function * GTY ((maybe_undef)) machine;
 354
 355   /* The largest alignment of slot allocated on the stack.  */
 356   unsigned int stack_alignment_needed;
 357
 358   /* Preferred alignment of the end of stack frame.  */
 359   unsigned int preferred_stack_boundary;
 360
 361   /* Language-specific code can use this to store whatever it likes.  */
 362   struct language_function * language;
 363
 364   /* Used types hash table.  */
 365   htab_t GTY ((param_is (union tree_node))) used_types_hash;
 366
 367   /* For reorg.  */
 368
 369   /* If some insns can be deferred to the delay slots of the epilogue, the
 370      delay list for them is recorded here.  */
 371   rtx epilogue_delay_list;
 372
 373   /* Maximal number of entities in the single jumptable.  Used to estimate
 374      final flowgraph size.  */
 375   int max_jumptable_ents;
 376
 377   /* UIDs for LABEL_DECLs.  */
 378   int last_label_uid;
 379
 380   /* Line number of the end of the function.  */
 381   location_t function_end_locus;
 382
 383   /* The variables unexpanded so far.  */
 384   tree unexpanded_var_list;
 385
 386   /* A variable living at the top of the frame that holds a known value.
 387      Used for detecting stack clobbers.  */
 388   tree stack_protect_guard;
 389
 390   /* Properties used by the pass manager.  */
 391   unsigned int curr_properties;
 392   unsigned int last_verified;
 393
 394   /* Collected bit flags.  */
 395
 396   /* Number of units of general registers that need saving in stdarg
 397      function.  What unit is depends on the backend, either it is number
 398      of bytes, or it can be number of registers.  */
 399   unsigned int va_list_gpr_size : 8;
 400
 401   /* Number of units of floating point registers that need saving in stdarg
 402      function.  */
 403   unsigned int va_list_fpr_size : 8;
 404
 405
 406   /* How commonly executed the function is.  Initialized during branch
 407      probabilities pass.  */
 408   ENUM_BITFIELD (function_frequency) function_frequency : 2;
 409
 410   /* Nonzero if function being compiled can call setjmp.  */
 411   unsigned int calls_setjmp : 1;
 412
 413   /* Nonzero if function being compiled can call alloca,
 414      either as a subroutine or builtin.  */
 415   unsigned int calls_alloca : 1;
 416
 417   /* Nonzero if function being compiled called builtin_return_addr or
 418      builtin_frame_address with nonzero count.  */
 419   unsigned int accesses_prior_frames : 1;
 420
 421   /* Nonzero if the function calls __builtin_eh_return.  */
 422   unsigned int calls_eh_return : 1;
 423
 424
 425   /* Nonzero if function being compiled receives nonlocal gotos
 426      from nested functions.  */
 427   unsigned int has_nonlocal_label : 1;
 428
 429   /* Nonzero if function saves all registers, e.g. if it has a nonlocal
 430      label that can reach the exit block via non-exceptional paths. */
 431   unsigned int saves_all_registers : 1;
 432
 433   /* Nonzero if function being compiled has nonlocal gotos to parent
 434      function.  */
 435   unsigned int has_nonlocal_goto : 1;
 436
 437   /* Nonzero if function being compiled has an asm statement.  */
 438   unsigned int has_asm_statement : 1;
 439
 440   /* Nonzero if the current function is a thunk, i.e., a lightweight
 441      function implemented by the output_mi_thunk hook) that just
 442      adjusts one of its arguments and forwards to another
 443      function.  */
 444   unsigned int is_thunk : 1;
 445
 446   /* This bit is used by the exception handling logic.  It is set if all
 447      calls (if any) are sibling calls.  Such functions do not have to
 448      have EH tables generated, as they cannot throw.  A call to such a
 449      function, however, should be treated as throwing if any of its callees
 450      can throw.  */
 451   unsigned int all_throwers_are_sibcalls : 1;
 452
 453   /* Nonzero if profiling code should be generated.  */
 454   unsigned int profile : 1;
 455
 456   /* Nonzero if stack limit checking should be enabled in the current
 457      function.  */
 458   unsigned int limit_stack : 1;
 459
 460
 461   /* Nonzero if current function uses stdarg.h or equivalent.  */
 462   unsigned int stdarg : 1;
 463
 464   /* Nonzero if the back-end should not keep track of expressions that
 465      determine the size of variable-sized objects.  Normally, such
 466      expressions are saved away, and then expanded when the next
 467      function is started.  For example, if a parameter has a
 468      variable-sized type, then the size of the parameter is computed
 469      when the function body is entered.  However, some front-ends do
 470      not desire this behavior.  */
 471   unsigned int x_dont_save_pending_sizes_p : 1;
 472
 473   /* Nonzero if the current function uses the constant pool.  */
 474   unsigned int uses_const_pool : 1;
 475
 476   /* Nonzero if the current function uses pic_offset_table_rtx.  */
 477   unsigned int uses_pic_offset_table : 1;
 478
 479   /* Nonzero if the current function needs an lsda for exception handling.  */
 480   unsigned int uses_eh_lsda : 1;
 481
 482   /* Nonzero if code to initialize arg_pointer_save_area has been emitted.  */
 483   unsigned int arg_pointer_save_area_init : 1;
 484
 485   unsigned int after_inlining : 1;
 486
 487   /* Set when the call to function itself has been emit.  */
 488   unsigned int recursive_call_emit : 1;
 489
 490
 491   /* Set when the tail call has been produced.  */
 492   unsigned int tail_call_emit : 1;
 493
 494   /* FIXME tuples: This bit is temporarily here to mark when a
 495      function has been gimplified, so we can make sure we're not
 496      creating non GIMPLE tuples after gimplification.  */
 497   unsigned int gimplified : 1;
 498
 499   /* Fields below this point are not set for abstract functions; see
 500      allocate_struct_function.  */
 501
 502   /* Nonzero if function being compiled needs to be given an address
 503      where the value should be stored.  */
 504   unsigned int returns_struct : 1;
 505
 506   /* Nonzero if function being compiled needs to
 507      return the address of where it has put a structure value.  */
 508   unsigned int returns_pcc_struct : 1;
 509
 510   /* Nonzero if pass_tree_profile was run on this function.  */
 511   unsigned int after_tree_profile : 1;
 512 };
 513
 514 /* If va_list_[gf]pr_size is set to this, it means we don't know how
 515    many units need to be saved.  */
 516 #define VA_LIST_MAX_GPR_SIZE    255
 517 #define VA_LIST_MAX_FPR_SIZE    255
 518
 519 /* The function currently being compiled.  */
 520 extern GTY(()) struct function *cfun;
 521
 522 /* In order to ensure that cfun is not set directly, we redefine it so
 523    that it is not an lvalue.  Rather than assign to cfun, use
 524    push_cfun or set_cfun.  */
 525 #define cfun (cfun + 0)
 526
 527 /* Pointer to chain of `struct function' for containing functions.  */
 528 extern GTY(()) struct function *outer_function_chain;
 529
 530 /* Nonzero if we've already converted virtual regs to hard regs.  */
 531 extern int virtuals_instantiated;
 532
 533 /* Nonzero if at least one trampoline has been created.  */
 534 extern int trampolines_created;
 535
 536 /* cfun shouldn't be set directly; use one of these functions instead.  */
 537 extern void set_cfun (struct function *new_cfun);
 538 extern void push_cfun (struct function *new_cfun);
 539 extern void pop_cfun (void);
 540 extern void instantiate_decl_rtl (rtx x);
 541
 542 /* For backward compatibility... eventually these should all go away.  */
 543 #define current_function_returns_struct (cfun->returns_struct)
 544 #define current_function_returns_pcc_struct (cfun->returns_pcc_struct)
 545 #define current_function_calls_setjmp (cfun->calls_setjmp)
 546 #define current_function_calls_alloca (cfun->calls_alloca)
 547 #define current_function_accesses_prior_frames (cfun->accesses_prior_frames)
 548 #define current_function_calls_eh_return (cfun->calls_eh_return)
 549 #define current_function_is_thunk (cfun->is_thunk)
 550 #define current_function_stdarg (cfun->stdarg)
 551 #define current_function_profile (cfun->profile)
 552 #define current_function_funcdef_no (cfun->funcdef_no)
 553 #define current_function_limit_stack (cfun->limit_stack)
 554 #define current_function_uses_pic_offset_table (cfun->uses_pic_offset_table)
 555 #define current_function_uses_const_pool (cfun->uses_const_pool)
 556 #define current_function_epilogue_delay_list (cfun->epilogue_delay_list)
 557 #define current_function_has_nonlocal_label (cfun->has_nonlocal_label)
 558 #define current_function_saves_all_registers (cfun->saves_all_registers)
 559 #define current_function_has_nonlocal_goto (cfun->has_nonlocal_goto)
 560 #define current_function_has_asm_statement (cfun->has_asm_statement)
 561
 562 #define current_loops (cfun->x_current_loops)
 563 #define dom_computed (cfun->cfg->x_dom_computed)
 564 #define n_bbs_in_dom_tree (cfun->cfg->x_n_bbs_in_dom_tree)
 565 #define VALUE_HISTOGRAMS(fun) (fun)->value_histograms
 566
 567 /* Given a function decl for a containing function,
 568    return the `struct function' for it.  */
 569 struct function *find_function_data (tree);
 570
 571 /* Identify BLOCKs referenced by more than one NOTE_INSN_BLOCK_{BEG,END},
 572    and create duplicate blocks.  */
 573 extern void reorder_blocks (void);
 574
 575 /* Set BLOCK_NUMBER for all the blocks in FN.  */
 576 extern void number_blocks (tree);
 577
 578 extern void clear_block_marks (tree);
 579 extern tree blocks_nreverse (tree);
 580
 581 /* Return size needed for stack frame based on slots so far allocated.
 582    This size counts from zero.  It is not rounded to STACK_BOUNDARY;
 583    the caller may have to do that.  */
 584 extern HOST_WIDE_INT get_frame_size (void);
 585
 586 /* Issue an error message and return TRUE if frame OFFSET overflows in
 587    the signed target pointer arithmetics for function FUNC.  Otherwise
 588    return FALSE.  */
 589 extern bool frame_offset_overflow (HOST_WIDE_INT, tree);
 590
 591 /* A pointer to a function to create target specific, per-function
 592    data structures.  */
 593 extern struct machine_function * (*init_machine_status) (void);
 594
 595 /* Save and restore status information for a nested function.  */
 596 extern void free_after_parsing (struct function *);
 597 extern void free_after_compilation (struct function *);
 598
 599 extern void init_varasm_status (void);
 600
 601 #ifdef RTX_CODE
 602 extern void diddle_return_value (void (*)(rtx, void*), void*);
 603 extern void clobber_return_register (void);
 604 #endif
 605
 606 extern rtx get_arg_pointer_save_area (void);
 607
 608 /* Returns the name of the current function.  */
 609 extern const char *current_function_name (void);
 610 /* Returns the assembler name (raw, mangled) of the current function.  */
 611 extern const char *current_function_assembler_name (void);
 612
 613 extern void do_warn_unused_parameter (tree);
 614
 615 extern bool pass_by_reference (CUMULATIVE_ARGS *, enum machine_mode,
 616                                tree, bool);
 617 extern bool reference_callee_copied (CUMULATIVE_ARGS *, enum machine_mode,
 618                                      tree, bool);
 619
 620 extern void used_types_insert (tree);
 621
 622 extern int get_next_funcdef_no (void);
 623 #endif  /* GCC_FUNCTION_H */