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 struct var_refs_queue GTY(())
  23 {
  24   rtx modified;
  25   enum machine_mode promoted_mode;
  26   int unsignedp;
  27   struct var_refs_queue *next;
  28 };
  29
  30 /* Stack of pending (incomplete) sequences saved by `start_sequence'.
  31    Each element describes one pending sequence.
  32    The main insn-chain is saved in the last element of the chain,
  33    unless the chain is empty.  */
  34
  35 struct sequence_stack GTY(())
  36 {
  37   /* First and last insns in the chain of the saved sequence.  */
  38   rtx first;
  39   rtx last;
  40   tree sequence_rtl_expr;
  41   struct sequence_stack *next;
  42 };
  43
  44 extern struct sequence_stack *sequence_stack;
  45
  46 /* Stack of single obstacks.  */
  47
  48 struct simple_obstack_stack
  49 {
  50   struct obstack *obstack;
  51   struct simple_obstack_stack *next;
  52 };
  53 \f
  54 struct emit_status GTY(())
  55 {
  56   /* This is reset to LAST_VIRTUAL_REGISTER + 1 at the start of each function.
  57      After rtl generation, it is 1 plus the largest register number used.  */
  58   int x_reg_rtx_no;
  59
  60   /* Lowest label number in current function.  */
  61   int x_first_label_num;
  62
  63   /* The ends of the doubly-linked chain of rtl for the current function.
  64      Both are reset to null at the start of rtl generation for the function.
  65
  66      start_sequence saves both of these on `sequence_stack' along with
  67      `sequence_rtl_expr' and then starts a new, nested sequence of insns.  */
  68   rtx x_first_insn;
  69   rtx x_last_insn;
  70
  71   /* RTL_EXPR within which the current sequence will be placed.  Use to
  72      prevent reuse of any temporaries within the sequence until after the
  73      RTL_EXPR is emitted.  */
  74   tree sequence_rtl_expr;
  75
  76   /* Stack of pending (incomplete) sequences saved by `start_sequence'.
  77      Each element describes one pending sequence.
  78      The main insn-chain is saved in the last element of the chain,
  79      unless the chain is empty.  */
  80   struct sequence_stack *sequence_stack;
  81
  82   /* INSN_UID for next insn emitted.
  83      Reset to 1 for each function compiled.  */
  84   int x_cur_insn_uid;
  85
  86   /* Line number and source file of the last line-number NOTE emitted.
  87      This is used to avoid generating duplicates.  */
  88   int x_last_linenum;
  89   const char *x_last_filename;
  90
  91   /* The length of the regno_pointer_align, regno_decl, and x_regno_reg_rtx
  92      vectors.  Since these vectors are needed during the expansion phase when
  93      the total number of registers in the function is not yet known, the
  94      vectors are copied and made bigger when necessary.  */
  95   int regno_pointer_align_length;
  96
  97   /* Indexed by pseudo register number, if nonzero gives the known alignment
  98      for that pseudo (if REG_POINTER is set in x_regno_reg_rtx).
  99      Allocated in parallel with x_regno_reg_rtx.  */
 100   unsigned char * GTY ((length ("%h.regno_pointer_align_length")))
 101     regno_pointer_align;
 102
 103   /* Indexed by pseudo register number, gives the rtx for that pseudo.
 104      Allocated in parallel with regno_pointer_align.
 105
 106      Note MEM expressions can appear in this array due to the actions
 107      of put_var_into_stack.  */
 108   rtx * GTY ((length ("%h.regno_pointer_align_length"))) x_regno_reg_rtx;
 109 };
 110
 111 /* For backward compatibility... eventually these should all go away.  */
 112 #define reg_rtx_no (cfun->emit->x_reg_rtx_no)
 113 #define seq_rtl_expr (cfun->emit->sequence_rtl_expr)
 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
 119 struct expr_status GTY(())
 120 {
 121   /* Number of units that we should eventually pop off the stack.
 122      These are the arguments to function calls that have already returned.  */
 123   int x_pending_stack_adjust;
 124
 125   /* Under some ABIs, it is the caller's responsibility to pop arguments
 126      pushed for function calls.  A naive implementation would simply pop
 127      the arguments immediately after each call.  However, if several
 128      function calls are made in a row, it is typically cheaper to pop
 129      all the arguments after all of the calls are complete since a
 130      single pop instruction can be used.  Therefore, GCC attempts to
 131      defer popping the arguments until absolutely necessary.  (For
 132      example, at the end of a conditional, the arguments must be popped,
 133      since code outside the conditional won't know whether or not the
 134      arguments need to be popped.)
 135
 136      When INHIBIT_DEFER_POP is nonzero, however, the compiler does not
 137      attempt to defer pops.  Instead, the stack is popped immediately
 138      after each call.  Rather then setting this variable directly, use
 139      NO_DEFER_POP and OK_DEFER_POP.  */
 140   int x_inhibit_defer_pop;
 141
 142   /* If PREFERRED_STACK_BOUNDARY and PUSH_ROUNDING are defined, the stack
 143      boundary can be momentarily unaligned while pushing the arguments.
 144      Record the delta since last aligned boundary here in order to get
 145      stack alignment in the nested function calls working right.  */
 146   int x_stack_pointer_delta;
 147
 148   /* Nonzero means __builtin_saveregs has already been done in this function.
 149      The value is the pseudoreg containing the value __builtin_saveregs
 150      returned.  */
 151   rtx x_saveregs_value;
 152
 153   /* Similarly for __builtin_apply_args.  */
 154   rtx x_apply_args_value;
 155
 156   /* List of labels that must never be deleted.  */
 157   rtx x_forced_labels;
 158
 159   /* Postincrements that still need to be expanded.  */
 160   rtx x_pending_chain;
 161 };
 162
 163 #define pending_stack_adjust (cfun->expr->x_pending_stack_adjust)
 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 #define stack_pointer_delta (cfun->expr->x_stack_pointer_delta)
 170
 171 /* This structure can save all the important global and static variables
 172    describing the status of the current function.  */
 173
 174 struct function GTY(())
 175 {
 176   struct eh_status *eh;
 177   struct stmt_status *stmt;
 178   struct expr_status *expr;
 179   struct emit_status *emit;
 180   struct varasm_status *varasm;
 181
 182   /* For function.c.  */
 183
 184   /* Name of this function.  */
 185   const char *name;
 186
 187   /* Points to the FUNCTION_DECL of this function.  */
 188   tree decl;
 189
 190   /* Function containing this function, if any.  */
 191   struct function *outer;
 192
 193   /* Number of bytes of args popped by function being compiled on its return.
 194      Zero if no bytes are to be popped.
 195      May affect compilation of return insn or of function epilogue.  */
 196   int pops_args;
 197
 198   /* If function's args have a fixed size, this is that size, in bytes.
 199      Otherwise, it is -1.
 200      May affect compilation of return insn or of function epilogue.  */
 201   int args_size;
 202
 203   /* # bytes the prologue should push and pretend that the caller pushed them.
 204      The prologue must do this, but only if parms can be passed in
 205      registers.  */
 206   int pretend_args_size;
 207
 208   /* # of bytes of outgoing arguments.  If ACCUMULATE_OUTGOING_ARGS is
 209      defined, the needed space is pushed by the prologue.  */
 210   int outgoing_args_size;
 211
 212   /* This is the offset from the arg pointer to the place where the first
 213      anonymous arg can be found, if there is one.  */
 214   rtx arg_offset_rtx;
 215
 216   /* Quantities of various kinds of registers
 217      used for the current function's args.  */
 218   CUMULATIVE_ARGS args_info;
 219
 220   /* If nonzero, an RTL expression for the location at which the current
 221      function returns its result.  If the current function returns its
 222      result in a register, current_function_return_rtx will always be
 223      the hard register containing the result.  */
 224   rtx return_rtx;
 225
 226   /* The arg pointer hard register, or the pseudo into which it was copied.  */
 227   rtx internal_arg_pointer;
 228
 229   /* Language-specific reason why the current function cannot be made
 230      inline.  */
 231   const char *cannot_inline;
 232
 233   /* Opaque pointer used by get_hard_reg_initial_val and
 234      has_hard_reg_initial_val (see integrate.[hc]).  */
 235   struct initial_value_struct *hard_reg_initial_vals;
 236
 237   /* Number of function calls seen so far in current function.  */
 238   int x_function_call_count;
 239
 240   /* List (chain of TREE_LIST) of LABEL_DECLs for all nonlocal labels
 241      (labels to which there can be nonlocal gotos from nested functions)
 242      in this function.  */
 243   tree x_nonlocal_labels;
 244
 245   /* List (chain of EXPR_LIST) of stack slots that hold the current handlers
 246      for nonlocal gotos.  There is one for every nonlocal label in the
 247      function; this list matches the one in nonlocal_labels.
 248      Zero when function does not have nonlocal labels.  */
 249   rtx x_nonlocal_goto_handler_slots;
 250
 251   /* List (chain of EXPR_LIST) of labels heading the current handlers for
 252      nonlocal gotos.  */
 253   rtx x_nonlocal_goto_handler_labels;
 254
 255   /* RTX for stack slot that holds the stack pointer value to restore
 256      for a nonlocal goto.
 257      Zero when function does not have nonlocal labels.  */
 258   rtx x_nonlocal_goto_stack_level;
 259
 260   /* Label that will go on parm cleanup code, if any.
 261      Jumping to this label runs cleanup code for parameters, if
 262      such code must be run.  Following this code is the logical return
 263      label.  */
 264   rtx x_cleanup_label;
 265
 266   /* Label that will go on function epilogue.
 267      Jumping to this label serves as a "return" instruction
 268      on machines which require execution of the epilogue on all returns.  */
 269   rtx x_return_label;
 270
 271   /* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs.
 272      So we can mark them all live at the end of the function, if nonopt.  */
 273   rtx x_save_expr_regs;
 274
 275   /* List (chain of EXPR_LISTs) of all stack slots in this function.
 276      Made for the sake of unshare_all_rtl.  */
 277   rtx x_stack_slot_list;
 278
 279   /* Chain of all RTL_EXPRs that have insns in them.  */
 280   tree x_rtl_expr_chain;
 281
 282   /* Label to jump back to for tail recursion, or 0 if we have
 283      not yet needed one for this function.  */
 284   rtx x_tail_recursion_label;
 285
 286   /* Place after which to insert the tail_recursion_label if we need one.  */
 287   rtx x_tail_recursion_reentry;
 288
 289   /* Location at which to save the argument pointer if it will need to be
 290      referenced.  There are two cases where this is done: if nonlocal gotos
 291      exist, or if vars stored at an offset from the argument pointer will be
 292      needed by inner routines.  */
 293   rtx x_arg_pointer_save_area;
 294
 295   /* If the function returns non-void, we will emit a clobber of the
 296      return registers just in case the user fell off the end without
 297      returning a proper value.  This is that insn.  */
 298   rtx x_clobber_return_insn;
 299
 300   /* Offset to end of allocated area of stack frame.
 301      If stack grows down, this is the address of the last stack slot allocated.
 302      If stack grows up, this is the address for the next slot.  */
 303   HOST_WIDE_INT x_frame_offset;
 304
 305   /* List (chain of TREE_LISTs) of static chains for containing functions.
 306      Each link has a FUNCTION_DECL in the TREE_PURPOSE and a reg rtx
 307      in an RTL_EXPR in the TREE_VALUE.  */
 308   tree x_context_display;
 309
 310   /* List (chain of TREE_LISTs) of trampolines for nested functions.
 311      The trampoline sets up the static chain and jumps to the function.
 312      We supply the trampoline's address when the function's address is
 313      requested.
 314
 315      Each link has a FUNCTION_DECL in the TREE_PURPOSE and a reg rtx
 316      in an RTL_EXPR in the TREE_VALUE.  */
 317   tree x_trampoline_list;
 318
 319   /* Insn after which register parms and SAVE_EXPRs are born, if nonopt.  */
 320   rtx x_parm_birth_insn;
 321
 322   /* Last insn of those whose job was to put parms into their nominal
 323      homes.  */
 324   rtx x_last_parm_insn;
 325
 326   /* 1 + last pseudo register number possibly used for loading a copy
 327      of a parameter of this function.  */
 328   unsigned int x_max_parm_reg;
 329
 330   /* Vector indexed by REGNO, containing location on stack in which
 331      to put the parm which is nominally in pseudo register REGNO,
 332      if we discover that that parm must go in the stack.  The highest
 333      element in this vector is one less than MAX_PARM_REG, above.  */
 334   rtx * GTY ((length ("%h.x_max_parm_reg"))) x_parm_reg_stack_loc;
 335
 336   /* List of all temporaries allocated, both available and in use.  */
 337   struct temp_slot *x_temp_slots;
 338
 339   /* Current nesting level for temporaries.  */
 340   int x_temp_slot_level;
 341
 342   /* Current nesting level for variables in a block.  */
 343   int x_var_temp_slot_level;
 344
 345   /* When temporaries are created by TARGET_EXPRs, they are created at
 346      this level of temp_slot_level, so that they can remain allocated
 347      until no longer needed.  CLEANUP_POINT_EXPRs define the lifetime
 348      of TARGET_EXPRs.  */
 349   int x_target_temp_slot_level;
 350
 351   /* This slot is initialized as 0 and is added to
 352      during the nested function.  */
 353   struct var_refs_queue *fixup_var_refs_queue;
 354
 355   /* For integrate.c.  */
 356   int inlinable;
 357   int no_debugging_symbols;
 358   rtvec original_arg_vector;
 359   tree original_decl_initial;
 360   /* Last insn of those whose job was to put parms into their nominal
 361      homes.  */
 362   rtx inl_last_parm_insn;
 363   /* Highest label number in current function.  */
 364   int inl_max_label_num;
 365
 366   /* Function sequence number for profiling, debugging, etc.  */
 367   int funcdef_no;
 368
 369   /* For md files.  */
 370
 371   /* tm.h can use this to store whatever it likes.  */
 372   struct machine_function * GTY ((maybe_undef (""))) machine;
 373   /* The largest alignment of slot allocated on the stack.  */
 374   int stack_alignment_needed;
 375   /* Preferred alignment of the end of stack frame.  */
 376   int preferred_stack_boundary;
 377
 378   /* Language-specific code can use this to store whatever it likes.  */
 379   struct language_function * language;
 380
 381   /* For reorg.  */
 382
 383   /* If some insns can be deferred to the delay slots of the epilogue, the
 384      delay list for them is recorded here.  */
 385   rtx epilogue_delay_list;
 386
 387   /* Collected bit flags.  */
 388
 389   /* Nonzero if function being compiled needs to be given an address
 390      where the value should be stored.  */
 391   unsigned int returns_struct : 1;
 392
 393   /* Nonzero if function being compiled needs to
 394      return the address of where it has put a structure value.  */
 395   unsigned int returns_pcc_struct : 1;
 396
 397   /* Nonzero if the current function returns a pointer type.  */
 398   unsigned int returns_pointer : 1;
 399
 400   /* Nonzero if function being compiled needs to be passed a static chain.  */
 401   unsigned int needs_context : 1;
 402
 403   /* Nonzero if function being compiled can call setjmp.  */
 404   unsigned int calls_setjmp : 1;
 405
 406   /* Nonzero if function being compiled can call longjmp.  */
 407   unsigned int calls_longjmp : 1;
 408
 409   /* Nonzero if function being compiled can call alloca,
 410      either as a subroutine or builtin.  */
 411   unsigned int calls_alloca : 1;
 412
 413   /* Nonzero if the function calls __builtin_eh_return.  */
 414   unsigned int calls_eh_return : 1;
 415
 416   /* Nonzero if the function calls __builtin_constant_p.  */
 417   unsigned int calls_constant_p : 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   /* This bit is used by the exception handling logic.  It is set if all
 439      calls (if any) are sibling calls.  Such functions do not have to
 440      have EH tables generated, as they cannot throw.  A call to such a
 441      function, however, should be treated as throwing if any of its callees
 442      can throw.  */
 443   unsigned int all_throwers_are_sibcalls : 1;
 444
 445   /* Nonzero if instrumentation calls for function entry and exit should be
 446      generated.  */
 447   unsigned int instrument_entry_exit : 1;
 448
 449   /* Nonzero if arc profiling should be done for the function.  */
 450   unsigned int arc_profile : 1;
 451
 452   /* Nonzero if profiling code should be generated.  */
 453   unsigned int profile : 1;
 454
 455   /* Nonzero if stack limit checking should be enabled in the current
 456      function.  */
 457   unsigned int limit_stack : 1;
 458
 459   /* Nonzero if current function uses stdarg.h or equivalent.  */
 460   unsigned int stdarg : 1;
 461
 462   /* Nonzero if this function is being processed in function-at-a-time
 463      mode.  In other words, if all tree structure for this function,
 464      including the BLOCK tree, is created before RTL generation
 465      commences.  */
 466   unsigned int x_whole_function_mode_p : 1;
 467
 468   /* Nonzero if the back-end should not keep track of expressions that
 469      determine the size of variable-sized objects.  Normally, such
 470      expressions are saved away, and then expanded when the next
 471      function is started.  For example, if a parameter has a
 472      variable-sized type, then the size of the parameter is computed
 473      when the function body is entered.  However, some front-ends do
 474      not desire this behavior.  */
 475   unsigned int x_dont_save_pending_sizes_p : 1;
 476
 477   /* Nonzero if the current function uses the constant pool.  */
 478   unsigned int uses_const_pool : 1;
 479
 480   /* Nonzero if the current function uses pic_offset_table_rtx.  */
 481   unsigned int uses_pic_offset_table : 1;
 482
 483   /* Nonzero if the current function needs an lsda for exception handling.  */
 484   unsigned int uses_eh_lsda : 1;
 485
 486   /* Nonzero if code to initialize arg_pointer_save_area has been emited.  */
 487   unsigned int arg_pointer_save_area_init : 1;
 488
 489   /* How commonly executed the function is.  Initialized during branch
 490      probabilities pass.  */
 491   enum function_frequency {
 492     /* This function most likely won't be executed at all.
 493        (set only when profile feedback is available).  */
 494     FUNCTION_FREQUENCY_UNLIKELY_EXECUTED,
 495     /* The default value.  */
 496     FUNCTION_FREQUENCY_NORMAL,
 497     /* Optimize this function hard
 498        (set only when profile feedback is available).  */
 499     FUNCTION_FREQUENCY_HOT
 500   } function_frequency;
 501
 502   /* Maximal number of entities in the single jumptable.  Used to estimate
 503      final flowgraph size.  */
 504   int max_jumptable_ents;
 505 };
 506
 507 /* The function currently being compiled.  */
 508 extern GTY(()) struct function *cfun;
 509
 510 /* Nonzero if we've already converted virtual regs to hard regs.  */
 511 extern int virtuals_instantiated;
 512
 513 /* For backward compatibility... eventually these should all go away.  */
 514 #define current_function_name (cfun->name)
 515 #define current_function_pops_args (cfun->pops_args)
 516 #define current_function_returns_struct (cfun->returns_struct)
 517 #define current_function_returns_pcc_struct (cfun->returns_pcc_struct)
 518 #define current_function_returns_pointer (cfun->returns_pointer)
 519 #define current_function_needs_context (cfun->needs_context)
 520 #define current_function_calls_setjmp (cfun->calls_setjmp)
 521 #define current_function_calls_alloca (cfun->calls_alloca)
 522 #define current_function_calls_longjmp (cfun->calls_longjmp)
 523 #define current_function_calls_eh_return (cfun->calls_eh_return)
 524 #define current_function_calls_constant_p (cfun->calls_constant_p)
 525 #define current_function_has_computed_jump (cfun->has_computed_jump)
 526 #define current_function_contains_functions (cfun->contains_functions)
 527 #define current_function_is_thunk (cfun->is_thunk)
 528 #define current_function_args_info (cfun->args_info)
 529 #define current_function_args_size (cfun->args_size)
 530 #define current_function_pretend_args_size (cfun->pretend_args_size)
 531 #define current_function_outgoing_args_size (cfun->outgoing_args_size)
 532 #define current_function_arg_offset_rtx (cfun->arg_offset_rtx)
 533 #define current_function_stdarg (cfun->stdarg)
 534 #define current_function_internal_arg_pointer (cfun->internal_arg_pointer)
 535 #define current_function_return_rtx (cfun->return_rtx)
 536 #define current_function_instrument_entry_exit (cfun->instrument_entry_exit)
 537 #define current_function_profile (cfun->profile)
 538 #define current_function_funcdef_no (cfun->funcdef_no)
 539 #define current_function_limit_stack (cfun->limit_stack)
 540 #define current_function_uses_pic_offset_table (cfun->uses_pic_offset_table)
 541 #define current_function_uses_const_pool (cfun->uses_const_pool)
 542 #define current_function_cannot_inline (cfun->cannot_inline)
 543 #define current_function_epilogue_delay_list (cfun->epilogue_delay_list)
 544 #define current_function_has_nonlocal_label (cfun->has_nonlocal_label)
 545 #define current_function_has_nonlocal_goto (cfun->has_nonlocal_goto)
 546
 547 #define max_parm_reg (cfun->x_max_parm_reg)
 548 #define parm_reg_stack_loc (cfun->x_parm_reg_stack_loc)
 549 #define cleanup_label (cfun->x_cleanup_label)
 550 #define return_label (cfun->x_return_label)
 551 #define save_expr_regs (cfun->x_save_expr_regs)
 552 #define stack_slot_list (cfun->x_stack_slot_list)
 553 #define parm_birth_insn (cfun->x_parm_birth_insn)
 554 #define frame_offset (cfun->x_frame_offset)
 555 #define tail_recursion_label (cfun->x_tail_recursion_label)
 556 #define tail_recursion_reentry (cfun->x_tail_recursion_reentry)
 557 #define arg_pointer_save_area (cfun->x_arg_pointer_save_area)
 558 #define rtl_expr_chain (cfun->x_rtl_expr_chain)
 559 #define last_parm_insn (cfun->x_last_parm_insn)
 560 #define context_display (cfun->x_context_display)
 561 #define trampoline_list (cfun->x_trampoline_list)
 562 #define function_call_count (cfun->x_function_call_count)
 563 #define temp_slots (cfun->x_temp_slots)
 564 #define temp_slot_level (cfun->x_temp_slot_level)
 565 #define target_temp_slot_level (cfun->x_target_temp_slot_level)
 566 #define var_temp_slot_level (cfun->x_var_temp_slot_level)
 567 #define nonlocal_labels (cfun->x_nonlocal_labels)
 568 #define nonlocal_goto_handler_slots (cfun->x_nonlocal_goto_handler_slots)
 569 #define nonlocal_goto_handler_labels (cfun->x_nonlocal_goto_handler_labels)
 570 #define nonlocal_goto_stack_level (cfun->x_nonlocal_goto_stack_level)
 571
 572 /* The FUNCTION_DECL for an inline function currently being expanded.  */
 573 extern tree inline_function_decl;
 574
 575 /* Given a function decl for a containing function,
 576    return the `struct function' for it.  */
 577 struct function *find_function_data PARAMS ((tree));
 578
 579 /* Set NOTE_BLOCK for each block note in the current function.  */
 580 extern void identify_blocks PARAMS ((void));
 581
 582 /* Identify BLOCKs referenced by more than one NOTE_INSN_BLOCK_{BEG,END},
 583    and create duplicate blocks.  */
 584 extern void reorder_blocks PARAMS ((void));
 585
 586 /* Set BLOCK_NUMBER for all the blocks in FN.  */
 587 extern void number_blocks PARAMS ((tree));
 588
 589 /* Return size needed for stack frame based on slots so far allocated.
 590    This size counts from zero.  It is not rounded to STACK_BOUNDARY;
 591    the caller may have to do that.  */
 592 extern HOST_WIDE_INT get_frame_size     PARAMS ((void));
 593 /* Likewise, but for a different than the current function.  */
 594 extern HOST_WIDE_INT get_func_frame_size        PARAMS ((struct function *));
 595
 596 /* A pointer to a function to create target specific, per-function
 597    data structures.  */
 598 extern struct machine_function * (*init_machine_status) PARAMS ((void));
 599
 600 /* Save and restore status information for a nested function.  */
 601 extern void restore_emit_status         PARAMS ((struct function *));
 602 extern void free_after_parsing          PARAMS ((struct function *));
 603 extern void free_after_compilation      PARAMS ((struct function *));
 604
 605 extern void init_varasm_status          PARAMS ((struct function *));
 606
 607 #ifdef RTX_CODE
 608 extern void diddle_return_value         PARAMS ((void (*)(rtx, void*), void*));
 609 extern void clobber_return_register     PARAMS ((void));
 610 extern void use_return_register         PARAMS ((void));
 611 #endif
 612
 613 extern rtx get_arg_pointer_save_area    PARAMS ((struct function *));
 614
 615 extern void init_virtual_regs           PARAMS ((struct emit_status *));
 616
 617 /* Called once, at initialization, to initialize function.c.  */
 618 extern void init_function_once          PARAMS ((void));