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   const 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   unsigned 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   /* If PREFERRED_STACK_BOUNDARY and PUSH_ROUNDING are defined, the stack
 151      boundary can be momentairly unaligned while pushing the arguments.
 152      Record the delta since last aligned boundary here in order to get
 153      stack alignment in the nested function calls working right.  */
 154   int x_stack_pointer_delta;
 155
 156   /* Nonzero means __builtin_saveregs has already been done in this function.
 157      The value is the pseudoreg containing the value __builtin_saveregs
 158      returned.  */
 159   rtx x_saveregs_value;
 160
 161   /* Similarly for __builtin_apply_args.  */
 162   rtx x_apply_args_value;
 163
 164   /* List of labels that must never be deleted.  */
 165   rtx x_forced_labels;
 166
 167   /* Postincrements that still need to be expanded.  */
 168   rtx x_pending_chain;
 169 };
 170
 171 #define pending_stack_adjust (cfun->expr->x_pending_stack_adjust)
 172 #define inhibit_defer_pop (cfun->expr->x_inhibit_defer_pop)
 173 #define saveregs_value (cfun->expr->x_saveregs_value)
 174 #define apply_args_value (cfun->expr->x_apply_args_value)
 175 #define forced_labels (cfun->expr->x_forced_labels)
 176 #define pending_chain (cfun->expr->x_pending_chain)
 177 #define stack_pointer_delta (cfun->expr->x_stack_pointer_delta)
 178
 179 /* This structure can save all the important global and static variables
 180    describing the status of the current function.  */
 181
 182 struct function
 183 {
 184   struct function *next_global;
 185   struct function *next;
 186
 187   struct eh_status *eh;
 188   struct stmt_status *stmt;
 189   struct expr_status *expr;
 190   struct emit_status *emit;
 191   struct varasm_status *varasm;
 192
 193   /* For function.c.  */
 194
 195   /* Name of this function.  */
 196   const char *name;
 197   /* Points to the FUNCTION_DECL of this function. */
 198   tree decl;
 199
 200   /* Number of bytes of args popped by function being compiled on its return.
 201      Zero if no bytes are to be popped.
 202      May affect compilation of return insn or of function epilogue.  */
 203   int pops_args;
 204
 205   /* Nonzero if function being compiled needs to be given an address
 206      where the value should be stored.  */
 207   int returns_struct;
 208
 209   /* Nonzero if function being compiled needs to
 210      return the address of where it has put a structure value.  */
 211   int returns_pcc_struct;
 212
 213   /* Nonzero if the current function returns a pointer type.  */
 214   int returns_pointer;
 215
 216   /* Nonzero if function being compiled needs to be passed a static chain.  */
 217   int needs_context;
 218
 219   /* Nonzero if function being compiled can call setjmp.  */
 220   int calls_setjmp;
 221
 222   /* Nonzero if function being compiled can call longjmp.  */
 223   int calls_longjmp;
 224
 225   /* Nonzero if function being compiled can call alloca,
 226      either as a subroutine or builtin.  */
 227   int calls_alloca;
 228
 229   /* Nonzero if function being compiled receives nonlocal gotos
 230      from nested functions.  */
 231
 232   int has_nonlocal_label;
 233
 234   /* Nonzero if function being compiled has nonlocal gotos to parent
 235      function.  */
 236   int has_nonlocal_goto;
 237
 238   /* Nonzero if function being compiled contains nested functions.  */
 239   int contains_functions;
 240
 241   /* Nonzero if the function being compiled issues a computed jump.  */
 242   int has_computed_jump;
 243
 244   /* Nonzero if the current function is a thunk (a lightweight function that
 245      just adjusts one of its arguments and forwards to another function), so
 246      we should try to cut corners where we can.  */
 247   int is_thunk;
 248
 249   /* If function's args have a fixed size, this is that size, in bytes.
 250      Otherwise, it is -1.
 251      May affect compilation of return insn or of function epilogue.  */
 252   int args_size;
 253
 254   /* # bytes the prologue should push and pretend that the caller pushed them.
 255      The prologue must do this, but only if parms can be passed in
 256      registers.  */
 257   int pretend_args_size;
 258
 259   /* # of bytes of outgoing arguments.  If ACCUMULATE_OUTGOING_ARGS is
 260      defined, the needed space is pushed by the prologue.  */
 261   int outgoing_args_size;
 262
 263   /* This is the offset from the arg pointer to the place where the first
 264      anonymous arg can be found, if there is one.  */
 265   rtx arg_offset_rtx;
 266
 267   /* Nonzero if current function uses varargs.h or equivalent.
 268      Zero for functions that use stdarg.h.  */
 269   int varargs;
 270
 271   /* Nonzero if current function uses stdarg.h or equivalent.
 272      Zero for functions that use varargs.h.  */
 273   int stdarg;
 274
 275   /* Quantities of various kinds of registers
 276      used for the current function's args.  */
 277   CUMULATIVE_ARGS args_info;
 278
 279   /* If non-zero, an RTL expression for the location at which the current
 280      function returns its result.  If the current function returns its
 281      result in a register, current_function_return_rtx will always be
 282      the hard register containing the result.  */
 283   rtx return_rtx;
 284
 285   /* The arg pointer hard register, or the pseudo into which it was copied.  */
 286   rtx internal_arg_pointer;
 287
 288   /* Language-specific reason why the current function cannot be made
 289      inline.  */
 290   const char *cannot_inline;
 291
 292   /* Nonzero if instrumentation calls for function entry and exit should be
 293      generated.  */
 294   int instrument_entry_exit;
 295
 296   /* Nonzero if memory access checking be enabled in the current function.  */
 297   int check_memory_usage;
 298
 299   /* Nonzero if stack limit checking should be enabled in the current
 300      function.  */
 301   int limit_stack;
 302
 303   /* Number of function calls seen so far in current function.  */
 304   int x_function_call_count;
 305
 306   /* Nonzero if this function is being processed in function-at-a-time
 307      mode.  In other words, if all tree structure for this function,
 308      including the BLOCK tree, is created before RTL generation
 309      commences.  */
 310   int x_whole_function_mode_p;
 311
 312   /* Nonzero if the back-end should not keep track of expressions that
 313      determine the size of variable-sized objects.  Normally, such
 314      expressions are saved away, and then expanded when the next
 315      function is started.  For example, if a parameter has a
 316      variable-sized type, then the size of the parameter is computed
 317      when the function body is entered.  However, some front-ends do
 318      not desire this behavior.  */
 319   int x_dont_save_pending_sizes_p;
 320
 321   /* List (chain of TREE_LIST) of LABEL_DECLs for all nonlocal labels
 322      (labels to which there can be nonlocal gotos from nested functions)
 323      in this function.  */
 324   tree x_nonlocal_labels;
 325
 326   /* List (chain of EXPR_LIST) of stack slots that hold the current handlers
 327      for nonlocal gotos.  There is one for every nonlocal label in the
 328      function; this list matches the one in nonlocal_labels.
 329      Zero when function does not have nonlocal labels.  */
 330   rtx x_nonlocal_goto_handler_slots;
 331
 332   /* List (chain of EXPR_LIST) of labels heading the current handlers for
 333      nonlocal gotos.  */
 334   rtx x_nonlocal_goto_handler_labels;
 335
 336   /* RTX for stack slot that holds the stack pointer value to restore
 337      for a nonlocal goto.
 338      Zero when function does not have nonlocal labels.  */
 339   rtx x_nonlocal_goto_stack_level;
 340
 341   /* Label that will go on parm cleanup code, if any.
 342      Jumping to this label runs cleanup code for parameters, if
 343      such code must be run.  Following this code is the logical return
 344      label.  */
 345   rtx x_cleanup_label;
 346
 347   /* Label that will go on function epilogue.
 348      Jumping to this label serves as a "return" instruction
 349      on machines which require execution of the epilogue on all returns.  */
 350   rtx x_return_label;
 351
 352   /* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs.
 353      So we can mark them all live at the end of the function, if nonopt.  */
 354   rtx x_save_expr_regs;
 355
 356   /* List (chain of EXPR_LISTs) of all stack slots in this function.
 357      Made for the sake of unshare_all_rtl.  */
 358   rtx x_stack_slot_list;
 359
 360   /* Chain of all RTL_EXPRs that have insns in them.  */
 361   tree x_rtl_expr_chain;
 362
 363   /* Label to jump back to for tail recursion, or 0 if we have
 364      not yet needed one for this function.  */
 365   rtx x_tail_recursion_label;
 366
 367   /* Place after which to insert the tail_recursion_label if we need one.  */
 368   rtx x_tail_recursion_reentry;
 369
 370   /* Location at which to save the argument pointer if it will need to be
 371      referenced.  There are two cases where this is done: if nonlocal gotos
 372      exist, or if vars stored at an offset from the argument pointer will be
 373      needed by inner routines.  */
 374   rtx x_arg_pointer_save_area;
 375
 376   /* Offset to end of allocated area of stack frame.
 377      If stack grows down, this is the address of the last stack slot allocated.
 378      If stack grows up, this is the address for the next slot.  */
 379   HOST_WIDE_INT x_frame_offset;
 380
 381   /* List (chain of TREE_LISTs) of static chains for containing functions.
 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_context_display;
 385
 386   /* List (chain of TREE_LISTs) of trampolines for nested functions.
 387      The trampoline sets up the static chain and jumps to the function.
 388      We supply the trampoline's address when the function's address is
 389      requested.
 390
 391      Each link has a FUNCTION_DECL in the TREE_PURPOSE and a reg rtx
 392      in an RTL_EXPR in the TREE_VALUE.  */
 393   tree x_trampoline_list;
 394
 395   /* Insn after which register parms and SAVE_EXPRs are born, if nonopt.  */
 396   rtx x_parm_birth_insn;
 397
 398   /* Last insn of those whose job was to put parms into their nominal
 399      homes.  */
 400   rtx x_last_parm_insn;
 401
 402   /* 1 + last pseudo register number possibly used for loading a copy
 403      of a parameter of this function. */
 404   unsigned int x_max_parm_reg;
 405
 406   /* Vector indexed by REGNO, containing location on stack in which
 407      to put the parm which is nominally in pseudo register REGNO,
 408      if we discover that that parm must go in the stack.  The highest
 409      element in this vector is one less than MAX_PARM_REG, above.  */
 410   rtx *x_parm_reg_stack_loc;
 411
 412   /* List of all temporaries allocated, both available and in use.  */
 413   struct temp_slot *x_temp_slots;
 414
 415   /* Current nesting level for temporaries.  */
 416   int x_temp_slot_level;
 417
 418   /* Current nesting level for variables in a block.  */
 419   int x_var_temp_slot_level;
 420
 421   /* When temporaries are created by TARGET_EXPRs, they are created at
 422      this level of temp_slot_level, so that they can remain allocated
 423      until no longer needed.  CLEANUP_POINT_EXPRs define the lifetime
 424      of TARGET_EXPRs.  */
 425   int x_target_temp_slot_level;
 426
 427   /* This slot is initialized as 0 and is added to
 428      during the nested function.  */
 429   struct var_refs_queue *fixup_var_refs_queue;
 430
 431   /* For tree.c.  */
 432   int all_types_permanent;
 433   struct momentary_level *momentary_stack;
 434   char *maybepermanent_firstobj;
 435   char *temporary_firstobj;
 436   char *momentary_firstobj;
 437   char *momentary_function_firstobj;
 438   struct obstack *current_obstack;
 439   struct obstack *function_obstack;
 440   struct obstack *function_maybepermanent_obstack;
 441   struct obstack *expression_obstack;
 442   struct obstack *saveable_obstack;
 443   struct obstack *rtl_obstack;
 444
 445   /* For integrate.c.  */
 446   int inlinable;
 447   /* This is in fact an rtvec.  */
 448   void *original_arg_vector;
 449   tree original_decl_initial;
 450   /* Last insn of those whose job was to put parms into their nominal
 451      homes.  */
 452   rtx inl_last_parm_insn;
 453   /* Highest label number in current function.  */
 454   int inl_max_label_num;
 455
 456   /* Nonzero if the current function uses the constant pool.  */
 457   int uses_const_pool;
 458
 459   /* For md files.  */
 460
 461   /* Nonzero if the current function uses pic_offset_table_rtx.  */
 462   int uses_pic_offset_table;
 463   /* tm.h can use this to store whatever it likes.  */
 464   struct machine_function *machine;
 465   /* The largest alignment of slot allocated on the stack.  */
 466   int stack_alignment_needed;
 467   /* Preferred alignment of the end of stack frame.  */
 468   int preferred_stack_boundary;
 469
 470   /* Language-specific code can use this to store whatever it likes.  */
 471   struct language_function *language;
 472
 473   /* For reorg.  */
 474
 475   /* If some insns can be deferred to the delay slots of the epilogue, the
 476      delay list for them is recorded here.  */
 477   rtx epilogue_delay_list;
 478 };
 479
 480 /* The function currently being compiled.  */
 481 extern struct function *cfun;
 482
 483 /* A list of all functions we have compiled so far.  */
 484 extern struct function *all_functions;
 485
 486 /* For backward compatibility... eventually these should all go away.  */
 487 #define current_function_name (cfun->name)
 488 #define current_function_pops_args (cfun->pops_args)
 489 #define current_function_returns_struct (cfun->returns_struct)
 490 #define current_function_returns_pcc_struct (cfun->returns_pcc_struct)
 491 #define current_function_returns_pointer (cfun->returns_pointer)
 492 #define current_function_needs_context (cfun->needs_context)
 493 #define current_function_calls_setjmp (cfun->calls_setjmp)
 494 #define current_function_calls_alloca (cfun->calls_alloca)
 495 #define current_function_calls_longjmp (cfun->calls_longjmp)
 496 #define current_function_has_computed_jump (cfun->has_computed_jump)
 497 #define current_function_contains_functions (cfun->contains_functions)
 498 #define current_function_is_thunk (cfun->is_thunk)
 499 #define current_function_args_info (cfun->args_info)
 500 #define current_function_args_size (cfun->args_size)
 501 #define current_function_pretend_args_size (cfun->pretend_args_size)
 502 #define current_function_outgoing_args_size (cfun->outgoing_args_size)
 503 #define current_function_arg_offset_rtx (cfun->arg_offset_rtx)
 504 #define current_function_varargs (cfun->varargs)
 505 #define current_function_stdarg (cfun->stdarg)
 506 #define current_function_internal_arg_pointer (cfun->internal_arg_pointer)
 507 #define current_function_return_rtx (cfun->return_rtx)
 508 #define current_function_instrument_entry_exit (cfun->instrument_entry_exit)
 509 #define current_function_check_memory_usage (cfun->check_memory_usage)
 510 #define current_function_limit_stack (cfun->limit_stack)
 511 #define current_function_uses_pic_offset_table (cfun->uses_pic_offset_table)
 512 #define current_function_uses_const_pool (cfun->uses_const_pool)
 513 #define current_function_cannot_inline (cfun->cannot_inline)
 514 #define current_function_epilogue_delay_list (cfun->epilogue_delay_list)
 515 #define current_function_has_nonlocal_label (cfun->has_nonlocal_label)
 516 #define current_function_has_nonlocal_goto (cfun->has_nonlocal_goto)
 517
 518 #define max_parm_reg (cfun->x_max_parm_reg)
 519 #define parm_reg_stack_loc (cfun->x_parm_reg_stack_loc)
 520 #define cleanup_label (cfun->x_cleanup_label)
 521 #define return_label (cfun->x_return_label)
 522 #define save_expr_regs (cfun->x_save_expr_regs)
 523 #define stack_slot_list (cfun->x_stack_slot_list)
 524 #define parm_birth_insn (cfun->x_parm_birth_insn)
 525 #define frame_offset (cfun->x_frame_offset)
 526 #define tail_recursion_label (cfun->x_tail_recursion_label)
 527 #define tail_recursion_reentry (cfun->x_tail_recursion_reentry)
 528 #define arg_pointer_save_area (cfun->x_arg_pointer_save_area)
 529 #define rtl_expr_chain (cfun->x_rtl_expr_chain)
 530 #define last_parm_insn (cfun->x_last_parm_insn)
 531 #define context_display (cfun->x_context_display)
 532 #define trampoline_list (cfun->x_trampoline_list)
 533 #define function_call_count (cfun->x_function_call_count)
 534 #define temp_slots (cfun->x_temp_slots)
 535 #define temp_slot_level (cfun->x_temp_slot_level)
 536 #define target_temp_slot_level (cfun->x_target_temp_slot_level)
 537 #define var_temp_slot_level (cfun->x_var_temp_slot_level)
 538 #define nonlocal_labels (cfun->x_nonlocal_labels)
 539 #define nonlocal_goto_handler_slots (cfun->x_nonlocal_goto_handler_slots)
 540 #define nonlocal_goto_handler_labels (cfun->x_nonlocal_goto_handler_labels)
 541 #define nonlocal_goto_stack_level (cfun->x_nonlocal_goto_stack_level)
 542
 543 /* The FUNCTION_DECL for an inline function currently being expanded.  */
 544 extern tree inline_function_decl;
 545
 546 /* Given a function decl for a containing function,
 547    return the `struct function' for it.  */
 548 struct function *find_function_data PARAMS ((tree));
 549
 550 /* Pointer to chain of `struct function' for containing functions.  */
 551 extern struct function *outer_function_chain;
 552
 553 /* Set NOTE_BLOCK for each block note in the current function.  */
 554 extern void identify_blocks PARAMS ((void));
 555
 556 /* Identify BLOCKs referenced by more than one NOTE_INSN_BLOCK_{BEG,END},
 557    and create duplicate blocks.  */
 558 extern void reorder_blocks PARAMS ((void));
 559
 560 /* Set BLOCK_NUMBER for all the blocks in FN.  */
 561 extern void number_blocks PARAMS ((tree));
 562
 563 /* Return size needed for stack frame based on slots so far allocated.
 564    This size counts from zero.  It is not rounded to STACK_BOUNDARY;
 565    the caller may have to do that.  */
 566 extern HOST_WIDE_INT get_frame_size     PARAMS ((void));
 567 /* Likewise, but for a different than the current function.  */
 568 extern HOST_WIDE_INT get_func_frame_size        PARAMS ((struct function *));
 569
 570 /* These variables hold pointers to functions to
 571    save and restore machine-specific data,
 572    in push_function_context and pop_function_context.  */
 573 extern void (*init_machine_status)      PARAMS ((struct function *));
 574 extern void (*mark_machine_status)      PARAMS ((struct function *));
 575 extern void (*save_machine_status)      PARAMS ((struct function *));
 576 extern void (*restore_machine_status)   PARAMS ((struct function *));
 577 extern void (*free_machine_status)      PARAMS ((struct function *));
 578
 579 /* Likewise, but for language-specific data.  */
 580 extern void (*init_lang_status)         PARAMS ((struct function *));
 581 extern void (*mark_lang_status)         PARAMS ((struct function *));
 582 extern void (*save_lang_status)         PARAMS ((struct function *));
 583 extern void (*restore_lang_status)      PARAMS ((struct function *));
 584 extern void (*free_lang_status)         PARAMS ((struct function *));
 585
 586 /* Save and restore status information for a nested function.  */
 587 extern void save_tree_status            PARAMS ((struct function *));
 588 extern void restore_tree_status         PARAMS ((struct function *));
 589 extern void restore_emit_status         PARAMS ((struct function *));
 590 extern void free_after_parsing          PARAMS ((struct function *));
 591 extern void free_after_compilation      PARAMS ((struct function *));
 592
 593 extern void init_varasm_status          PARAMS ((struct function *));
 594 extern void free_varasm_status          PARAMS ((struct function *));
 595 extern void free_emit_status            PARAMS ((struct function *));
 596 extern void free_stmt_status            PARAMS ((struct function *));
 597 extern void free_eh_status              PARAMS ((struct function *));
 598 extern void free_expr_status            PARAMS ((struct function *));
 599
 600 extern rtx get_first_block_beg          PARAMS ((void));
 601
 602 #ifdef RTX_CODE
 603 extern void diddle_return_value         PARAMS ((void (*)(rtx, void*), void*));
 604 extern void clobber_return_register     PARAMS ((void));
 605 extern void use_return_register         PARAMS ((void));
 606 #endif
 607
 608 extern void init_virtual_regs           PARAMS ((struct emit_status *));
 609
 610 /* Called once, at initialization, to initialize function.c.  */
 611 extern void init_function_once          PARAMS ((void));
 612
 613 #ifdef rtx
 614 #undef rtx
 615 #endif
 616
 617 #ifdef tree
 618 #undef tree
 619 #endif