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