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