gcc/function.h

   1 /* Structure for saving state for a nested function.
   2    Copyright (C) 1989, 92-99, 2000 Free Software Foundation, Inc.
   3
   4 This file is part of GNU CC.
   5
   6 GNU CC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU CC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU CC; see the file COPYING.  If not, write to
  18 the Free Software Foundation, 59 Temple Place - Suite 330,
  19 Boston, MA 02111-1307, USA.  */
  20
  21
  22 #if !defined(NULL_TREE) && !defined(tree)
  23 typedef union union_node *_function_tree;
  24 #define tree _function_tree
  25 #endif
  26 #if !defined(NULL_RTX) && !defined(rtx)
  27 typedef struct rtx_def *_function_rtx;
  28 #define rtx _function_rtx
  29 #endif
  30
  31 struct var_refs_queue
  32 {
  33   rtx modified;
  34   enum machine_mode promoted_mode;
  35   int unsignedp;
  36   struct var_refs_queue *next;
  37 };
  38
  39 /* Stack of pending (incomplete) sequences saved by `start_sequence'.
  40    Each element describes one pending sequence.
  41    The main insn-chain is saved in the last element of the chain,
  42    unless the chain is empty.  */
  43
  44 struct sequence_stack
  45 {
  46   /* First and last insns in the chain of the saved sequence.  */
  47   rtx first, last;
  48   tree sequence_rtl_expr;
  49   struct sequence_stack *next;
  50 };
  51
  52 extern struct sequence_stack *sequence_stack;
  53
  54 /* Stack of single obstacks.  */
  55
  56 struct simple_obstack_stack
  57 {
  58   struct obstack *obstack;
  59   struct simple_obstack_stack *next;
  60 };
  61 \f
  62 struct emit_status
  63 {
  64   /* This is reset to LAST_VIRTUAL_REGISTER + 1 at the start of each function.
  65      After rtl generation, it is 1 plus the largest register number used.  */
  66   int x_reg_rtx_no;
  67
  68   /* Lowest label number in current function.  */
  69   int x_first_label_num;
  70
  71   /* The ends of the doubly-linked chain of rtl for the current function.
  72      Both are reset to null at the start of rtl generation for the function.
  73
  74      start_sequence saves both of these on `sequence_stack' along with
  75      `sequence_rtl_expr' and then starts a new, nested sequence of insns.  */
  76   rtx x_first_insn;
  77   rtx x_last_insn;
  78
  79   /* RTL_EXPR within which the current sequence will be placed.  Use to
  80      prevent reuse of any temporaries within the sequence until after the
  81      RTL_EXPR is emitted.  */
  82   tree sequence_rtl_expr;
  83
  84   /* Stack of pending (incomplete) sequences saved by `start_sequence'.
  85      Each element describes one pending sequence.
  86      The main insn-chain is saved in the last element of the chain,
  87      unless the chain is empty.  */
  88   struct sequence_stack *sequence_stack;
  89
  90   /* INSN_UID for next insn emitted.
  91      Reset to 1 for each function compiled.  */
  92   int x_cur_insn_uid;
  93
  94   /* Line number and source file of the last line-number NOTE emitted.
  95      This is used to avoid generating duplicates.  */
  96   int x_last_linenum;
  97   char *x_last_filename;
  98
  99   /* A vector indexed by pseudo reg number.  The allocated length
 100      of this vector is regno_pointer_flag_length.  Since this
 101      vector is needed during the expansion phase when the total
 102      number of registers in the function is not yet known,
 103      it is copied and made bigger when necessary.  */
 104   char *regno_pointer_flag;
 105   int regno_pointer_flag_length;
 106
 107   /* Indexed by pseudo register number, if nonzero gives the known alignment
 108      for that pseudo (if regno_pointer_flag is set).
 109      Allocated in parallel with regno_pointer_flag.  */
 110   char *regno_pointer_align;
 111
 112   /* Indexed by pseudo register number, gives the rtx for that pseudo.
 113      Allocated in parallel with regno_pointer_flag.  */
 114   rtx *x_regno_reg_rtx;
 115 };
 116
 117 /* For backward compatibility... eventually these should all go away.  */
 118 #define reg_rtx_no (cfun->emit->x_reg_rtx_no)
 119 #define seq_rtl_expr (cfun->emit->sequence_rtl_expr)
 120 #define regno_reg_rtx (cfun->emit->x_regno_reg_rtx)
 121 #define seq_stack (cfun->emit->sequence_stack)
 122
 123 #define REGNO_POINTER_ALIGN(REGNO) (cfun->emit->regno_pointer_align[REGNO])
 124 #define REGNO_POINTER_FLAG(REGNO) (cfun->emit->regno_pointer_flag[REGNO])
 125
 126 struct expr_status
 127 {
 128   /* Number of units that we should eventually pop off the stack.
 129      These are the arguments to function calls that have already returned.  */
 130   int x_pending_stack_adjust;
 131
 132   /* Under some ABIs, it is the caller's responsibility to pop arguments
 133      pushed for function calls.  A naive implementation would simply pop
 134      the arguments immediately after each call.  However, if several
 135      function calls are made in a row, it is typically cheaper to pop
 136      all the arguments after all of the calls are complete since a
 137      single pop instruction can be used.  Therefore, GCC attempts to
 138      defer popping the arguments until absolutely necessary.  (For
 139      example, at the end of a conditional, the arguments must be popped,
 140      since code outside the conditional won't know whether or not the
 141      arguments need to be popped.)
 142
 143      When INHIBIT_DEFER_POP is non-zero, however, the compiler does not
 144      attempt to defer pops.  Instead, the stack is popped immediately
 145      after each call.  Rather then setting this variable directly, use
 146      NO_DEFER_POP and OK_DEFER_POP.  */
 147   int x_inhibit_defer_pop;
 148
 149   /* Nonzero means __builtin_saveregs has already been done in this function.
 150      The value is the pseudoreg containing the value __builtin_saveregs
 151      returned.  */
 152   rtx x_saveregs_value;
 153
 154   /* Similarly for __builtin_apply_args.  */
 155   rtx x_apply_args_value;
 156
 157   /* List of labels that must never be deleted.  */
 158   rtx x_forced_labels;
 159
 160   /* Postincrements that still need to be expanded.  */
 161   rtx x_pending_chain;
 162 };
 163
 164 #define pending_stack_adjust (cfun->expr->x_pending_stack_adjust)
 165 #define inhibit_defer_pop (cfun->expr->x_inhibit_defer_pop)
 166 #define saveregs_value (cfun->expr->x_saveregs_value)
 167 #define apply_args_value (cfun->expr->x_apply_args_value)
 168 #define forced_labels (cfun->expr->x_forced_labels)
 169 #define pending_chain (cfun->expr->x_pending_chain)
 170
 171 /* This structure can save all the important global and static variables
 172    describing the status of the current function.  */
 173
 174 struct function
 175 {
 176   struct function *next_global;
 177   struct function *next;
 178
 179   struct eh_status *eh;
 180   struct stmt_status *stmt;
 181   struct expr_status *expr;
 182   struct emit_status *emit;
 183   struct varasm_status *varasm;
 184
 185   /* For function.c.  */
 186
 187   /* Name of this function.  */
 188   const char *name;
 189   /* Points to the FUNCTION_DECL of this function. */
 190   tree decl;
 191
 192   /* Number of bytes of args popped by function being compiled on its return.
 193      Zero if no bytes are to be popped.
 194      May affect compilation of return insn or of function epilogue.  */
 195   int pops_args;
 196
 197   /* Nonzero if function being compiled needs to be given an address
 198      where the value should be stored.  */
 199   int returns_struct;
 200
 201   /* Nonzero if function being compiled needs to
 202      return the address of where it has put a structure value.  */
 203   int returns_pcc_struct;
 204
 205   /* Nonzero if the current function returns a pointer type.  */
 206   int returns_pointer;
 207
 208   /* Nonzero if function being compiled needs to be passed a static chain.  */
 209   int needs_context;
 210
 211   /* Nonzero if function being compiled can call setjmp.  */
 212   int calls_setjmp;
 213
 214   /* Nonzero if function being compiled can call longjmp.  */
 215   int calls_longjmp;
 216
 217   /* Nonzero if function being compiled can call alloca,
 218      either as a subroutine or builtin.  */
 219   int calls_alloca;
 220
 221   /* Nonzero if function being compiled receives nonlocal gotos
 222      from nested functions.  */
 223
 224   int has_nonlocal_label;
 225
 226   /* Nonzero if function being compiled has nonlocal gotos to parent
 227      function.  */
 228   int has_nonlocal_goto;
 229
 230   /* Nonzero if function being compiled contains nested functions.  */
 231   int contains_functions;
 232
 233   /* Nonzero if the function being compiled issues a computed jump.  */
 234   int has_computed_jump;
 235
 236   /* Nonzero if the current function is a thunk (a lightweight function that
 237      just adjusts one of its arguments and forwards to another function), so
 238      we should try to cut corners where we can.  */
 239   int is_thunk;
 240
 241   /* If function's args have a fixed size, this is that size, in bytes.
 242      Otherwise, it is -1.
 243      May affect compilation of return insn or of function epilogue.  */
 244   int args_size;
 245
 246   /* # bytes the prologue should push and pretend that the caller pushed them.
 247      The prologue must do this, but only if parms can be passed in
 248      registers.  */
 249   int pretend_args_size;
 250
 251   /* # of bytes of outgoing arguments.  If ACCUMULATE_OUTGOING_ARGS is
 252      defined, the needed space is pushed by the prologue.  */
 253   int outgoing_args_size;
 254
 255   /* This is the offset from the arg pointer to the place where the first
 256      anonymous arg can be found, if there is one.  */
 257   rtx arg_offset_rtx;
 258
 259   /* Nonzero if current function uses varargs.h or equivalent.
 260      Zero for functions that use stdarg.h.  */
 261   int varargs;
 262
 263   /* Nonzero if current function uses stdarg.h or equivalent.
 264      Zero for functions that use varargs.h.  */
 265   int stdarg;
 266
 267   /* Quantities of various kinds of registers
 268      used for the current function's args.  */
 269   CUMULATIVE_ARGS args_info;
 270
 271   /* If non-zero, an RTL expression for the location at which the current
 272      function returns its result.  If the current function returns its
 273      result in a register, current_function_return_rtx will always be
 274      the hard register containing the result.  */
 275   rtx return_rtx;
 276
 277   /* The arg pointer hard register, or the pseudo into which it was copied.  */
 278   rtx internal_arg_pointer;
 279
 280   /* Language-specific reason why the current function cannot be made
 281      inline.  */
 282   const char *cannot_inline;
 283
 284   /* Nonzero if instrumentation calls for function entry and exit should be
 285      generated.  */
 286   int instrument_entry_exit;
 287
 288   /* Nonzero if memory access checking be enabled in the current function.  */
 289   int check_memory_usage;
 290
 291   /* Nonzero if stack limit checking should be enabled in the current
 292      function.  */
 293   int limit_stack;
 294
 295   /* Number of function calls seen so far in current function.  */
 296   int x_function_call_count;
 297
 298   /* Nonzero if this function is being processed in function-at-a-time
 299      mode.  In other words, if all tree structure for this function,
 300      including the BLOCK tree is created, before RTL generation
 301      commences.  */
 302   int x_whole_function_mode_p;
 303
 304   /* Nonzero if the back-end should not keep track of expressions that
 305      determine the size of variable-sized objects.  Normally, such
 306      expressions are saved away, and then expanded when the next
 307      function is started.  For example, if a parameter has a
 308      variable-sized type, then the size of the parameter is computed
 309      when the function body is entered.  However, some front-ends do
 310      not desire this behavior.  */
 311   int x_dont_save_pending_sizes_p;
 312
 313   /* List (chain of TREE_LIST) of LABEL_DECLs for all nonlocal labels
 314      (labels to which there can be nonlocal gotos from nested functions)
 315      in this function.  */
 316   tree x_nonlocal_labels;
 317
 318   /* List (chain of EXPR_LIST) of stack slots that hold the current handlers
 319      for nonlocal gotos.  There is one for every nonlocal label in the
 320      function; this list matches the one in nonlocal_labels.
 321      Zero when function does not have nonlocal labels.  */
 322   rtx x_nonlocal_goto_handler_slots;
 323
 324   /* List (chain of EXPR_LIST) of labels heading the current handlers for
 325      nonlocal gotos.  */
 326   rtx x_nonlocal_goto_handler_labels;
 327
 328   /* RTX for stack slot that holds the stack pointer value to restore
 329      for a nonlocal goto.
 330      Zero when function does not have nonlocal labels.  */
 331   rtx x_nonlocal_goto_stack_level;
 332
 333   /* Label that will go on parm cleanup code, if any.
 334      Jumping to this label runs cleanup code for parameters, if
 335      such code must be run.  Following this code is the logical return
 336      label.  */
 337   rtx x_cleanup_label;
 338
 339   /* Label that will go on function epilogue.
 340      Jumping to this label serves as a "return" instruction
 341      on machines which require execution of the epilogue on all returns.  */
 342   rtx x_return_label;
 343
 344   /* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs.
 345      So we can mark them all live at the end of the function, if nonopt.  */
 346   rtx x_save_expr_regs;
 347
 348   /* List (chain of EXPR_LISTs) of all stack slots in this function.
 349      Made for the sake of unshare_all_rtl.  */
 350   rtx x_stack_slot_list;
 351
 352   /* Chain of all RTL_EXPRs that have insns in them.  */
 353   tree x_rtl_expr_chain;
 354
 355   /* Label to jump back to for tail recursion, or 0 if we have
 356      not yet needed one for this function.  */
 357   rtx x_tail_recursion_label;
 358
 359   /* Place after which to insert the tail_recursion_label if we need one.  */
 360   rtx x_tail_recursion_reentry;
 361
 362   /* Location at which to save the argument pointer if it will need to be
 363      referenced.  There are two cases where this is done: if nonlocal gotos
 364      exist, or if vars stored at an offset from the argument pointer will be
 365      needed by inner routines.  */
 366   rtx x_arg_pointer_save_area;
 367
 368   /* Offset to end of allocated area of stack frame.
 369      If stack grows down, this is the address of the last stack slot allocated.
 370      If stack grows up, this is the address for the next slot.  */
 371   HOST_WIDE_INT x_frame_offset;
 372
 373   /* List (chain of TREE_LISTs) of static chains for containing functions.
 374      Each link has a FUNCTION_DECL in the TREE_PURPOSE and a reg rtx
 375      in an RTL_EXPR in the TREE_VALUE.  */
 376   tree x_context_display;
 377
 378   /* List (chain of TREE_LISTs) of trampolines for nested functions.
 379      The trampoline sets up the static chain and jumps to the function.
 380      We supply the trampoline's address when the function's address is
 381      requested.
 382
 383      Each link has a FUNCTION_DECL in the TREE_PURPOSE and a reg rtx
 384      in an RTL_EXPR in the TREE_VALUE.  */
 385   tree x_trampoline_list;
 386
 387   /* Insn after which register parms and SAVE_EXPRs are born, if nonopt.  */
 388   rtx x_parm_birth_insn;
 389
 390   /* Last insn of those whose job was to put parms into their nominal
 391      homes.  */
 392   rtx x_last_parm_insn;
 393
 394   /* 1 + last pseudo register number possibly used for loading a copy
 395      of a parameter of this function. */
 396   int x_max_parm_reg;
 397
 398   /* Vector indexed by REGNO, containing location on stack in which
 399      to put the parm which is nominally in pseudo register REGNO,
 400      if we discover that that parm must go in the stack.  The highest
 401      element in this vector is one less than MAX_PARM_REG, above.  */
 402   rtx *x_parm_reg_stack_loc;
 403
 404   /* List of all temporaries allocated, both available and in use.  */
 405   struct temp_slot *x_temp_slots;
 406
 407   /* Current nesting level for temporaries.  */
 408   int x_temp_slot_level;
 409
 410   /* Current nesting level for variables in a block.  */
 411   int x_var_temp_slot_level;
 412
 413   /* When temporaries are created by TARGET_EXPRs, they are created at
 414      this level of temp_slot_level, so that they can remain allocated
 415      until no longer needed.  CLEANUP_POINT_EXPRs define the lifetime
 416      of TARGET_EXPRs.  */
 417   int x_target_temp_slot_level;
 418
 419   /* This slot is initialized as 0 and is added to
 420      during the nested function.  */
 421   struct var_refs_queue *fixup_var_refs_queue;
 422
 423   /* For tree.c.  */
 424   int all_types_permanent;
 425   struct momentary_level *momentary_stack;
 426   char *maybepermanent_firstobj;
 427   char *temporary_firstobj;
 428   char *momentary_firstobj;
 429   char *momentary_function_firstobj;
 430   struct obstack *current_obstack;
 431   struct obstack *function_obstack;
 432   struct obstack *function_maybepermanent_obstack;
 433   struct obstack *expression_obstack;
 434   struct obstack *saveable_obstack;
 435   struct obstack *rtl_obstack;
 436
 437   /* For integrate.c.  */
 438   int inlinable;
 439   /* This is in fact an rtvec.  */
 440   void *original_arg_vector;
 441   tree original_decl_initial;
 442   /* Last insn of those whose job was to put parms into their nominal
 443      homes.  */
 444   rtx inl_last_parm_insn;
 445   /* Highest label number in current function.  */
 446   int inl_max_label_num;
 447
 448   /* Nonzero if the current function uses the constant pool.  */
 449   int uses_const_pool;
 450
 451   /* For md files.  */
 452
 453   /* Nonzero if the current function uses pic_offset_table_rtx.  */
 454   int uses_pic_offset_table;
 455   /* tm.h can use this to store whatever it likes.  */
 456   struct machine_function *machine;
 457   /* The largest alignment of slot allocated on the stack.  */
 458   int stack_alignment_needed;
 459   /* Preferred alignment of the end of stack frame.  */
 460   int preferred_stack_boundary;
 461
 462   /* Language-specific code can use this to store whatever it likes.  */
 463   struct language_function *language;
 464
 465   /* For reorg.  */
 466
 467   /* If some insns can be deferred to the delay slots of the epilogue, the
 468      delay list for them is recorded here.  */
 469   rtx epilogue_delay_list;
 470 };
 471
 472 /* The function currently being compiled.  */
 473 extern struct function *cfun;
 474
 475 /* A list of all functions we have compiled so far.  */
 476 extern struct function *all_functions;
 477
 478 /* For backward compatibility... eventually these should all go away.  */
 479 #define current_function_name (cfun->name)
 480 #define current_function_pops_args (cfun->pops_args)
 481 #define current_function_returns_struct (cfun->returns_struct)
 482 #define current_function_returns_pcc_struct (cfun->returns_pcc_struct)
 483 #define current_function_returns_pointer (cfun->returns_pointer)
 484 #define current_function_needs_context (cfun->needs_context)
 485 #define current_function_calls_setjmp (cfun->calls_setjmp)
 486 #define current_function_calls_alloca (cfun->calls_alloca)
 487 #define current_function_calls_longjmp (cfun->calls_longjmp)
 488 #define current_function_has_computed_jump (cfun->has_computed_jump)
 489 #define current_function_contains_functions (cfun->contains_functions)
 490 #define current_function_is_thunk (cfun->is_thunk)
 491 #define current_function_args_info (cfun->args_info)
 492 #define current_function_args_size (cfun->args_size)
 493 #define current_function_pretend_args_size (cfun->pretend_args_size)
 494 #define current_function_outgoing_args_size (cfun->outgoing_args_size)
 495 #define current_function_arg_offset_rtx (cfun->arg_offset_rtx)
 496 #define current_function_varargs (cfun->varargs)
 497 #define current_function_stdarg (cfun->stdarg)
 498 #define current_function_internal_arg_pointer (cfun->internal_arg_pointer)
 499 #define current_function_return_rtx (cfun->return_rtx)
 500 #define current_function_instrument_entry_exit (cfun->instrument_entry_exit)
 501 #define current_function_check_memory_usage (cfun->check_memory_usage)
 502 #define current_function_limit_stack (cfun->limit_stack)
 503 #define current_function_uses_pic_offset_table (cfun->uses_pic_offset_table)
 504 #define current_function_uses_const_pool (cfun->uses_const_pool)
 505 #define current_function_cannot_inline (cfun->cannot_inline)
 506 #define current_function_epilogue_delay_list (cfun->epilogue_delay_list)
 507 #define current_function_has_nonlocal_label (cfun->has_nonlocal_label)
 508 #define current_function_has_nonlocal_goto (cfun->has_nonlocal_goto)
 509
 510 #define max_parm_reg (cfun->x_max_parm_reg)
 511 #define parm_reg_stack_loc (cfun->x_parm_reg_stack_loc)
 512 #define cleanup_label (cfun->x_cleanup_label)
 513 #define return_label (cfun->x_return_label)
 514 #define save_expr_regs (cfun->x_save_expr_regs)
 515 #define stack_slot_list (cfun->x_stack_slot_list)
 516 #define parm_birth_insn (cfun->x_parm_birth_insn)
 517 #define frame_offset (cfun->x_frame_offset)
 518 #define tail_recursion_label (cfun->x_tail_recursion_label)
 519 #define tail_recursion_reentry (cfun->x_tail_recursion_reentry)
 520 #define arg_pointer_save_area (cfun->x_arg_pointer_save_area)
 521 #define rtl_expr_chain (cfun->x_rtl_expr_chain)
 522 #define last_parm_insn (cfun->x_last_parm_insn)
 523 #define context_display (cfun->x_context_display)
 524 #define trampoline_list (cfun->x_trampoline_list)
 525 #define function_call_count (cfun->x_function_call_count)
 526 #define temp_slots (cfun->x_temp_slots)
 527 #define temp_slot_level (cfun->x_temp_slot_level)
 528 #define target_temp_slot_level (cfun->x_target_temp_slot_level)
 529 #define var_temp_slot_level (cfun->x_var_temp_slot_level)
 530 #define nonlocal_labels (cfun->x_nonlocal_labels)
 531 #define nonlocal_goto_handler_slots (cfun->x_nonlocal_goto_handler_slots)
 532 #define nonlocal_goto_handler_labels (cfun->x_nonlocal_goto_handler_labels)
 533 #define nonlocal_goto_stack_level (cfun->x_nonlocal_goto_stack_level)
 534
 535 /* The FUNCTION_DECL for an inline function currently being expanded.  */
 536 extern tree inline_function_decl;
 537
 538 /* Given a function decl for a containing function,
 539    return the `struct function' for it.  */
 540 struct function *find_function_data PARAMS ((tree));
 541
 542 /* Pointer to chain of `struct function' for containing functions.  */
 543 extern struct function *outer_function_chain;
 544
 545 /* Put all this function's BLOCK nodes into a vector and return it.
 546    Also store in each NOTE for the beginning or end of a block
 547    the index of that block in the vector.  */
 548 extern void identify_blocks PARAMS ((tree, rtx));
 549
 550 /* Return size needed for stack frame based on slots so far allocated.
 551    This size counts from zero.  It is not rounded to STACK_BOUNDARY;
 552    the caller may have to do that.  */
 553 extern HOST_WIDE_INT get_frame_size     PARAMS ((void));
 554 /* Likewise, but for a different than the current function.  */
 555 extern HOST_WIDE_INT get_func_frame_size        PARAMS ((struct function *));
 556
 557 /* These variables hold pointers to functions to
 558    save and restore machine-specific data,
 559    in push_function_context and pop_function_context.  */
 560 extern void (*init_machine_status)      PARAMS ((struct function *));
 561 extern void (*mark_machine_status)      PARAMS ((struct function *));
 562 extern void (*save_machine_status)      PARAMS ((struct function *));
 563 extern void (*restore_machine_status)   PARAMS ((struct function *));
 564 extern void (*free_machine_status)      PARAMS ((struct function *));
 565
 566 /* Likewise, but for language-specific data.  */
 567 extern void (*init_lang_status)         PARAMS ((struct function *));
 568 extern void (*mark_lang_status)         PARAMS ((struct function *));
 569 extern void (*save_lang_status)         PARAMS ((struct function *));
 570 extern void (*restore_lang_status)      PARAMS ((struct function *));
 571 extern void (*free_lang_status)         PARAMS ((struct function *));
 572
 573 /* Save and restore status information for a nested function.  */
 574 extern void save_tree_status            PARAMS ((struct function *));
 575 extern void restore_tree_status         PARAMS ((struct function *));
 576 extern void restore_emit_status         PARAMS ((struct function *));
 577 extern void free_after_parsing          PARAMS ((struct function *));
 578 extern void free_after_compilation      PARAMS ((struct function *));
 579
 580 extern void init_varasm_status          PARAMS ((struct function *));
 581 extern void free_varasm_status          PARAMS ((struct function *));
 582 extern void free_emit_status            PARAMS ((struct function *));
 583 extern void free_stmt_status            PARAMS ((struct function *));
 584 extern void free_eh_status              PARAMS ((struct function *));
 585 extern void free_expr_status            PARAMS ((struct function *));
 586
 587 extern rtx get_first_block_beg          PARAMS ((void));
 588
 589 #ifdef RTX_CODE
 590 extern void diddle_return_value         PARAMS ((void (*)(rtx, void*), void*));
 591 extern void clobber_return_register     PARAMS ((void));
 592 extern void use_return_register         PARAMS ((void));
 593 #endif
 594
 595 extern void init_virtual_regs           PARAMS ((struct emit_status *));
 596
 597 /* Called once, at initialization, to initialize function.c.  */
 598 extern void init_function_once          PARAMS ((void));
 599
 600 #ifdef rtx
 601 #undef rtx
 602 #endif
 603
 604 #ifdef tree
 605 #undef tree
 606 #endif