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