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 GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 2, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 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 eh_status *eh;
 182   struct stmt_status *stmt;
 183   struct expr_status *expr;
 184   struct emit_status *emit;
 185   struct varasm_status *varasm;
 186
 187   /* For function.c.  */
 188
 189   /* Name of this function.  */
 190   const char *name;
 191
 192   /* Points to the FUNCTION_DECL of this function.  */
 193   tree decl;
 194
 195   /* Function containing this function, if any.  */
 196   struct function *outer;
 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   /* Opaque pointer used by get_hard_reg_initial_val and
 239      has_hard_reg_initial_val (see integrate.[hc]).  */
 240   struct initial_value_struct *hard_reg_initial_vals;
 241
 242   /* Number of function calls seen so far in current function.  */
 243   int x_function_call_count;
 244
 245   /* List (chain of TREE_LIST) of LABEL_DECLs for all nonlocal labels
 246      (labels to which there can be nonlocal gotos from nested functions)
 247      in this function.  */
 248   tree x_nonlocal_labels;
 249
 250   /* List (chain of EXPR_LIST) of stack slots that hold the current handlers
 251      for nonlocal gotos.  There is one for every nonlocal label in the
 252      function; this list matches the one in nonlocal_labels.
 253      Zero when function does not have nonlocal labels.  */
 254   rtx x_nonlocal_goto_handler_slots;
 255
 256   /* List (chain of EXPR_LIST) of labels heading the current handlers for
 257      nonlocal gotos.  */
 258   rtx x_nonlocal_goto_handler_labels;
 259
 260   /* RTX for stack slot that holds the stack pointer value to restore
 261      for a nonlocal goto.
 262      Zero when function does not have nonlocal labels.  */
 263   rtx x_nonlocal_goto_stack_level;
 264
 265   /* Label that will go on parm cleanup code, if any.
 266      Jumping to this label runs cleanup code for parameters, if
 267      such code must be run.  Following this code is the logical return
 268      label.  */
 269   rtx x_cleanup_label;
 270
 271   /* Label that will go on function epilogue.
 272      Jumping to this label serves as a "return" instruction
 273      on machines which require execution of the epilogue on all returns.  */
 274   rtx x_return_label;
 275
 276   /* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs.
 277      So we can mark them all live at the end of the function, if nonopt.  */
 278   rtx x_save_expr_regs;
 279
 280   /* List (chain of EXPR_LISTs) of all stack slots in this function.
 281      Made for the sake of unshare_all_rtl.  */
 282   rtx x_stack_slot_list;
 283
 284   /* Chain of all RTL_EXPRs that have insns in them.  */
 285   tree x_rtl_expr_chain;
 286
 287   /* Label to jump back to for tail recursion, or 0 if we have
 288      not yet needed one for this function.  */
 289   rtx x_tail_recursion_label;
 290
 291   /* Place after which to insert the tail_recursion_label if we need one.  */
 292   rtx x_tail_recursion_reentry;
 293
 294   /* Location at which to save the argument pointer if it will need to be
 295      referenced.  There are two cases where this is done: if nonlocal gotos
 296      exist, or if vars stored at an offset from the argument pointer will be
 297      needed by inner routines.  */
 298   rtx x_arg_pointer_save_area;
 299
 300   /* If the function returns non-void, we will emit a clobber of the
 301      return registers just in case the user fell off the end without
 302      returning a proper value.  This is that insn.  */
 303   rtx x_clobber_return_insn;
 304
 305   /* Offset to end of allocated area of stack frame.
 306      If stack grows down, this is the address of the last stack slot allocated.
 307      If stack grows up, this is the address for the next slot.  */
 308   HOST_WIDE_INT x_frame_offset;
 309
 310   /* List (chain of TREE_LISTs) of static chains for containing functions.
 311      Each link has a FUNCTION_DECL in the TREE_PURPOSE and a reg rtx
 312      in an RTL_EXPR in the TREE_VALUE.  */
 313   tree x_context_display;
 314
 315   /* List (chain of TREE_LISTs) of trampolines for nested functions.
 316      The trampoline sets up the static chain and jumps to the function.
 317      We supply the trampoline's address when the function's address is
 318      requested.
 319
 320      Each link has a FUNCTION_DECL in the TREE_PURPOSE and a reg rtx
 321      in an RTL_EXPR in the TREE_VALUE.  */
 322   tree x_trampoline_list;
 323
 324   /* Insn after which register parms and SAVE_EXPRs are born, if nonopt.  */
 325   rtx x_parm_birth_insn;
 326
 327   /* Last insn of those whose job was to put parms into their nominal
 328      homes.  */
 329   rtx x_last_parm_insn;
 330
 331   /* 1 + last pseudo register number possibly used for loading a copy
 332      of a parameter of this function.  */
 333   unsigned int x_max_parm_reg;
 334
 335   /* Vector indexed by REGNO, containing location on stack in which
 336      to put the parm which is nominally in pseudo register REGNO,
 337      if we discover that that parm must go in the stack.  The highest
 338      element in this vector is one less than MAX_PARM_REG, above.  */
 339   rtx *x_parm_reg_stack_loc;
 340
 341   /* List of all temporaries allocated, both available and in use.  */
 342   struct temp_slot *x_temp_slots;
 343
 344   /* Current nesting level for temporaries.  */
 345   int x_temp_slot_level;
 346
 347   /* Current nesting level for variables in a block.  */
 348   int x_var_temp_slot_level;
 349
 350   /* When temporaries are created by TARGET_EXPRs, they are created at
 351      this level of temp_slot_level, so that they can remain allocated
 352      until no longer needed.  CLEANUP_POINT_EXPRs define the lifetime
 353      of TARGET_EXPRs.  */
 354   int x_target_temp_slot_level;
 355
 356   /* This slot is initialized as 0 and is added to
 357      during the nested function.  */
 358   struct var_refs_queue *fixup_var_refs_queue;
 359
 360   /* For integrate.c.  */
 361   int inlinable;
 362   int no_debugging_symbols;
 363   /* This is in fact an rtvec.  */
 364   void *original_arg_vector;
 365   tree original_decl_initial;
 366   /* Last insn of those whose job was to put parms into their nominal
 367      homes.  */
 368   rtx inl_last_parm_insn;
 369   /* Highest label number in current function.  */
 370   int inl_max_label_num;
 371
 372   /* For md files.  */
 373
 374   /* tm.h can use this to store whatever it likes.  */
 375   struct machine_function *machine;
 376   /* The largest alignment of slot allocated on the stack.  */
 377   int stack_alignment_needed;
 378   /* Preferred alignment of the end of stack frame.  */
 379   int preferred_stack_boundary;
 380
 381   /* Language-specific code can use this to store whatever it likes.  */
 382   struct language_function *language;
 383
 384   /* For reorg.  */
 385
 386   /* If some insns can be deferred to the delay slots of the epilogue, the
 387      delay list for them is recorded here.  */
 388   rtx epilogue_delay_list;
 389
 390   /* Collected bit flags.  */
 391
 392   /* Nonzero if function being compiled needs to be given an address
 393      where the value should be stored.  */
 394   unsigned int returns_struct : 1;
 395
 396   /* Nonzero if function being compiled needs to
 397      return the address of where it has put a structure value.  */
 398   unsigned int returns_pcc_struct : 1;
 399
 400   /* Nonzero if the current function returns a pointer type.  */
 401   unsigned int returns_pointer : 1;
 402
 403   /* Nonzero if function being compiled needs to be passed a static chain.  */
 404   unsigned int needs_context : 1;
 405
 406   /* Nonzero if function being compiled can call setjmp.  */
 407   unsigned int calls_setjmp : 1;
 408
 409   /* Nonzero if function being compiled can call longjmp.  */
 410   unsigned int calls_longjmp : 1;
 411
 412   /* Nonzero if function being compiled can call alloca,
 413      either as a subroutine or builtin.  */
 414   unsigned int calls_alloca : 1;
 415
 416   /* Nonzero if the function calls __builtin_eh_return.  */
 417   unsigned int calls_eh_return : 1;
 418
 419   /* Nonzero if function being compiled receives nonlocal gotos
 420      from nested functions.  */
 421   unsigned int has_nonlocal_label : 1;
 422
 423   /* Nonzero if function being compiled has nonlocal gotos to parent
 424      function.  */
 425   unsigned int has_nonlocal_goto : 1;
 426
 427   /* Nonzero if function being compiled contains nested functions.  */
 428   unsigned int contains_functions : 1;
 429
 430   /* Nonzero if the function being compiled issues a computed jump.  */
 431   unsigned int has_computed_jump : 1;
 432
 433   /* Nonzero if the current function is a thunk (a lightweight function that
 434      just adjusts one of its arguments and forwards to another function), so
 435      we should try to cut corners where we can.  */
 436   unsigned int is_thunk : 1;
 437
 438   /* Nonzero if instrumentation calls for function entry and exit should be
 439      generated.  */
 440   unsigned int instrument_entry_exit : 1;
 441
 442   /* Nonzero if memory access checking be enabled in the current function.  */
 443   unsigned int check_memory_usage : 1;
 444
 445   /* Nonzero if stack limit checking should be enabled in the current
 446      function.  */
 447   unsigned int limit_stack : 1;
 448
 449   /* Nonzero if current function uses varargs.h or equivalent.
 450      Zero for functions that use stdarg.h.  */
 451   unsigned int varargs : 1;
 452
 453   /* Nonzero if current function uses stdarg.h or equivalent.
 454      Zero for functions that use varargs.h.  */
 455   unsigned int stdarg : 1;
 456
 457   /* Nonzero if this function is being processed in function-at-a-time
 458      mode.  In other words, if all tree structure for this function,
 459      including the BLOCK tree, is created before RTL generation
 460      commences.  */
 461   unsigned int x_whole_function_mode_p : 1;
 462
 463   /* Nonzero if the back-end should not keep track of expressions that
 464      determine the size of variable-sized objects.  Normally, such
 465      expressions are saved away, and then expanded when the next
 466      function is started.  For example, if a parameter has a
 467      variable-sized type, then the size of the parameter is computed
 468      when the function body is entered.  However, some front-ends do
 469      not desire this behavior.  */
 470   unsigned int x_dont_save_pending_sizes_p : 1;
 471
 472   /* Nonzero if the current function uses the constant pool.  */
 473   unsigned int uses_const_pool : 1;
 474
 475   /* Nonzero if the current function uses pic_offset_table_rtx.  */
 476   unsigned int uses_pic_offset_table : 1;
 477
 478   /* Nonzero if the current function needs an lsda for exception handling.  */
 479   unsigned int uses_eh_lsda : 1;
 480
 481   /* Nonzero if code to initialize arg_pointer_save_area has been emited.  */
 482   unsigned int arg_pointer_save_area_init : 1;
 483 };
 484
 485 /* The function currently being compiled.  */
 486 extern struct function *cfun;
 487
 488 /* Nonzero if we've already converted virtual regs to hard regs.  */
 489 extern int virtuals_instantiated;
 490
 491 /* For backward compatibility... eventually these should all go away.  */
 492 #define current_function_name (cfun->name)
 493 #define current_function_pops_args (cfun->pops_args)
 494 #define current_function_returns_struct (cfun->returns_struct)
 495 #define current_function_returns_pcc_struct (cfun->returns_pcc_struct)
 496 #define current_function_returns_pointer (cfun->returns_pointer)
 497 #define current_function_needs_context (cfun->needs_context)
 498 #define current_function_calls_setjmp (cfun->calls_setjmp)
 499 #define current_function_calls_alloca (cfun->calls_alloca)
 500 #define current_function_calls_longjmp (cfun->calls_longjmp)
 501 #define current_function_calls_eh_return (cfun->calls_eh_return)
 502 #define current_function_has_computed_jump (cfun->has_computed_jump)
 503 #define current_function_contains_functions (cfun->contains_functions)
 504 #define current_function_is_thunk (cfun->is_thunk)
 505 #define current_function_args_info (cfun->args_info)
 506 #define current_function_args_size (cfun->args_size)
 507 #define current_function_pretend_args_size (cfun->pretend_args_size)
 508 #define current_function_outgoing_args_size (cfun->outgoing_args_size)
 509 #define current_function_arg_offset_rtx (cfun->arg_offset_rtx)
 510 #define current_function_varargs (cfun->varargs)
 511 #define current_function_stdarg (cfun->stdarg)
 512 #define current_function_internal_arg_pointer (cfun->internal_arg_pointer)
 513 #define current_function_return_rtx (cfun->return_rtx)
 514 #define current_function_instrument_entry_exit (cfun->instrument_entry_exit)
 515 #define current_function_check_memory_usage (cfun->check_memory_usage)
 516 #define current_function_limit_stack (cfun->limit_stack)
 517 #define current_function_uses_pic_offset_table (cfun->uses_pic_offset_table)
 518 #define current_function_uses_const_pool (cfun->uses_const_pool)
 519 #define current_function_cannot_inline (cfun->cannot_inline)
 520 #define current_function_epilogue_delay_list (cfun->epilogue_delay_list)
 521 #define current_function_has_nonlocal_label (cfun->has_nonlocal_label)
 522 #define current_function_has_nonlocal_goto (cfun->has_nonlocal_goto)
 523
 524 #define max_parm_reg (cfun->x_max_parm_reg)
 525 #define parm_reg_stack_loc (cfun->x_parm_reg_stack_loc)
 526 #define cleanup_label (cfun->x_cleanup_label)
 527 #define return_label (cfun->x_return_label)
 528 #define save_expr_regs (cfun->x_save_expr_regs)
 529 #define stack_slot_list (cfun->x_stack_slot_list)
 530 #define parm_birth_insn (cfun->x_parm_birth_insn)
 531 #define frame_offset (cfun->x_frame_offset)
 532 #define tail_recursion_label (cfun->x_tail_recursion_label)
 533 #define tail_recursion_reentry (cfun->x_tail_recursion_reentry)
 534 #define arg_pointer_save_area (cfun->x_arg_pointer_save_area)
 535 #define rtl_expr_chain (cfun->x_rtl_expr_chain)
 536 #define last_parm_insn (cfun->x_last_parm_insn)
 537 #define context_display (cfun->x_context_display)
 538 #define trampoline_list (cfun->x_trampoline_list)
 539 #define function_call_count (cfun->x_function_call_count)
 540 #define temp_slots (cfun->x_temp_slots)
 541 #define temp_slot_level (cfun->x_temp_slot_level)
 542 #define target_temp_slot_level (cfun->x_target_temp_slot_level)
 543 #define var_temp_slot_level (cfun->x_var_temp_slot_level)
 544 #define nonlocal_labels (cfun->x_nonlocal_labels)
 545 #define nonlocal_goto_handler_slots (cfun->x_nonlocal_goto_handler_slots)
 546 #define nonlocal_goto_handler_labels (cfun->x_nonlocal_goto_handler_labels)
 547 #define nonlocal_goto_stack_level (cfun->x_nonlocal_goto_stack_level)
 548
 549 /* The FUNCTION_DECL for an inline function currently being expanded.  */
 550 extern tree inline_function_decl;
 551
 552 /* Given a function decl for a containing function,
 553    return the `struct function' for it.  */
 554 struct function *find_function_data PARAMS ((tree));
 555
 556 /* Set NOTE_BLOCK for each block note in the current function.  */
 557 extern void identify_blocks PARAMS ((void));
 558
 559 /* Identify BLOCKs referenced by more than one NOTE_INSN_BLOCK_{BEG,END},
 560    and create duplicate blocks.  */
 561 extern void reorder_blocks PARAMS ((void));
 562
 563 /* Set BLOCK_NUMBER for all the blocks in FN.  */
 564 extern void number_blocks PARAMS ((tree));
 565
 566 /* Return size needed for stack frame based on slots so far allocated.
 567    This size counts from zero.  It is not rounded to STACK_BOUNDARY;
 568    the caller may have to do that.  */
 569 extern HOST_WIDE_INT get_frame_size     PARAMS ((void));
 570 /* Likewise, but for a different than the current function.  */
 571 extern HOST_WIDE_INT get_func_frame_size        PARAMS ((struct function *));
 572
 573 /* These variables hold pointers to functions to create and destroy
 574    target specific, per-function data structures.  */
 575 extern void (*init_machine_status)      PARAMS ((struct function *));
 576 extern void (*free_machine_status)      PARAMS ((struct function *));
 577 /* This variable holds a pointer to a function to register any
 578    data items in the target specific, per-function data structure
 579    that will need garbage collection.  */
 580 extern void (*mark_machine_status)      PARAMS ((struct function *));
 581
 582 /* Likewise, but for language-specific data.  */
 583 extern void (*init_lang_status)         PARAMS ((struct function *));
 584 extern void (*mark_lang_status)         PARAMS ((struct function *));
 585 extern void (*save_lang_status)         PARAMS ((struct function *));
 586 extern void (*restore_lang_status)      PARAMS ((struct function *));
 587 extern void (*free_lang_status)         PARAMS ((struct function *));
 588
 589 /* Save and restore status information for a nested function.  */
 590 extern void restore_emit_status         PARAMS ((struct function *));
 591 extern void free_after_parsing          PARAMS ((struct function *));
 592 extern void free_after_compilation      PARAMS ((struct function *));
 593
 594 extern void init_varasm_status          PARAMS ((struct function *));
 595 extern void restore_varasm_status       PARAMS ((struct function *));
 596 extern void free_varasm_status          PARAMS ((struct function *));
 597 extern void free_emit_status            PARAMS ((struct function *));
 598 extern void free_stmt_status            PARAMS ((struct function *));
 599 extern void free_eh_status              PARAMS ((struct function *));
 600 extern void free_expr_status            PARAMS ((struct function *));
 601
 602 extern rtx get_first_block_beg          PARAMS ((void));
 603
 604 #ifdef RTX_CODE
 605 extern void diddle_return_value         PARAMS ((void (*)(rtx, void*), void*));
 606 extern void clobber_return_register     PARAMS ((void));
 607 extern void use_return_register         PARAMS ((void));
 608 #endif
 609
 610 extern rtx get_arg_pointer_save_area    PARAMS ((struct function *));
 611
 612 extern void init_virtual_regs           PARAMS ((struct emit_status *));
 613
 614 /* Called once, at initialization, to initialize function.c.  */
 615 extern void init_function_once          PARAMS ((void));
 616
 617 #ifdef rtx
 618 #undef rtx
 619 #endif
 620
 621 #ifdef tree
 622 #undef tree
 623 #endif