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, 2003 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 #ifndef GCC_FUNCTION_H
  23 #define GCC_FUNCTION_H
  24
  25 struct var_refs_queue GTY(())
  26 {
  27   rtx modified;
  28   enum machine_mode promoted_mode;
  29   int unsignedp;
  30   struct var_refs_queue *next;
  31 };
  32
  33 /* Stack of pending (incomplete) sequences saved by `start_sequence'.
  34    Each element describes one pending sequence.
  35    The main insn-chain is saved in the last element of the chain,
  36    unless the chain is empty.  */
  37
  38 struct sequence_stack GTY(())
  39 {
  40   /* First and last insns in the chain of the saved sequence.  */
  41   rtx first;
  42   rtx last;
  43   tree sequence_rtl_expr;
  44   struct sequence_stack *next;
  45 };
  46
  47 extern struct sequence_stack *sequence_stack;
  48
  49 /* Stack of single obstacks.  */
  50
  51 struct simple_obstack_stack
  52 {
  53   struct obstack *obstack;
  54   struct simple_obstack_stack *next;
  55 };
  56 \f
  57 struct emit_status GTY(())
  58 {
  59   /* This is reset to LAST_VIRTUAL_REGISTER + 1 at the start of each function.
  60      After rtl generation, it is 1 plus the largest register number used.  */
  61   int x_reg_rtx_no;
  62
  63   /* Lowest label number in current function.  */
  64   int x_first_label_num;
  65
  66   /* The ends of the doubly-linked chain of rtl for the current function.
  67      Both are reset to null at the start of rtl generation for the function.
  68
  69      start_sequence saves both of these on `sequence_stack' along with
  70      `sequence_rtl_expr' and then starts a new, nested sequence of insns.  */
  71   rtx x_first_insn;
  72   rtx x_last_insn;
  73
  74   /* RTL_EXPR within which the current sequence will be placed.  Use to
  75      prevent reuse of any temporaries within the sequence until after the
  76      RTL_EXPR is emitted.  */
  77   tree sequence_rtl_expr;
  78
  79   /* Stack of pending (incomplete) sequences saved by `start_sequence'.
  80      Each element describes one pending sequence.
  81      The main insn-chain is saved in the last element of the chain,
  82      unless the chain is empty.  */
  83   struct sequence_stack *sequence_stack;
  84
  85   /* INSN_UID for next insn emitted.
  86      Reset to 1 for each function compiled.  */
  87   int x_cur_insn_uid;
  88
  89   /* Location the last line-number NOTE emitted.
  90      This is used to avoid generating duplicates.  */
  91   location_t x_last_location;
  92
  93   /* The length of the regno_pointer_align, regno_decl, and x_regno_reg_rtx
  94      vectors.  Since these vectors are needed during the expansion phase when
  95      the total number of registers in the function is not yet known, the
  96      vectors are copied and made bigger when necessary.  */
  97   int regno_pointer_align_length;
  98
  99   /* Indexed by pseudo register number, if nonzero gives the known alignment
 100      for that pseudo (if REG_POINTER is set in x_regno_reg_rtx).
 101      Allocated in parallel with x_regno_reg_rtx.  */
 102   unsigned char * GTY ((length ("%h.x_reg_rtx_no")))
 103     regno_pointer_align;
 104
 105   /* Indexed by pseudo register number, gives the rtx for that pseudo.
 106      Allocated in parallel with regno_pointer_align.
 107
 108      Note MEM expressions can appear in this array due to the actions
 109      of put_var_into_stack.  */
 110   rtx * GTY ((length ("%h.x_reg_rtx_no"))) x_regno_reg_rtx;
 111 };
 112
 113 /* For backward compatibility... eventually these should all go away.  */
 114 #define reg_rtx_no (cfun->emit->x_reg_rtx_no)
 115 #define seq_rtl_expr (cfun->emit->sequence_rtl_expr)
 116 #define regno_reg_rtx (cfun->emit->x_regno_reg_rtx)
 117 #define seq_stack (cfun->emit->sequence_stack)
 118
 119 #define REGNO_POINTER_ALIGN(REGNO) (cfun->emit->regno_pointer_align[REGNO])
 120
 121 struct expr_status GTY(())
 122 {
 123   /* Number of units that we should eventually pop off the stack.
 124      These are the arguments to function calls that have already returned.  */
 125   int x_pending_stack_adjust;
 126
 127   /* Under some ABIs, it is the caller's responsibility to pop arguments
 128      pushed for function calls.  A naive implementation would simply pop
 129      the arguments immediately after each call.  However, if several
 130      function calls are made in a row, it is typically cheaper to pop
 131      all the arguments after all of the calls are complete since a
 132      single pop instruction can be used.  Therefore, GCC attempts to
 133      defer popping the arguments until absolutely necessary.  (For
 134      example, at the end of a conditional, the arguments must be popped,
 135      since code outside the conditional won't know whether or not the
 136      arguments need to be popped.)
 137
 138      When INHIBIT_DEFER_POP is nonzero, however, the compiler does not
 139      attempt to defer pops.  Instead, the stack is popped immediately
 140      after each call.  Rather then setting this variable directly, use
 141      NO_DEFER_POP and OK_DEFER_POP.  */
 142   int x_inhibit_defer_pop;
 143
 144   /* If PREFERRED_STACK_BOUNDARY and PUSH_ROUNDING are defined, the stack
 145      boundary can be momentarily unaligned while pushing the arguments.
 146      Record the delta since last aligned boundary here in order to get
 147      stack alignment in the nested function calls working right.  */
 148   int x_stack_pointer_delta;
 149
 150   /* Nonzero means __builtin_saveregs has already been done in this function.
 151      The value is the pseudoreg containing the value __builtin_saveregs
 152      returned.  */
 153   rtx x_saveregs_value;
 154
 155   /* Similarly for __builtin_apply_args.  */
 156   rtx x_apply_args_value;
 157
 158   /* List of labels that must never be deleted.  */
 159   rtx x_forced_labels;
 160
 161   /* Postincrements that still need to be expanded.  */
 162   rtx x_pending_chain;
 163 };
 164
 165 #define pending_stack_adjust (cfun->expr->x_pending_stack_adjust)
 166 #define inhibit_defer_pop (cfun->expr->x_inhibit_defer_pop)
 167 #define saveregs_value (cfun->expr->x_saveregs_value)
 168 #define apply_args_value (cfun->expr->x_apply_args_value)
 169 #define forced_labels (cfun->expr->x_forced_labels)
 170 #define pending_chain (cfun->expr->x_pending_chain)
 171 #define stack_pointer_delta (cfun->expr->x_stack_pointer_delta)
 172
 173 /* This structure can save all the important global and static variables
 174    describing the status of the current function.  */
 175
 176 struct function GTY(())
 177 {
 178   struct eh_status *eh;
 179   struct stmt_status *stmt;
 180   struct expr_status *expr;
 181   struct emit_status *emit;
 182   struct varasm_status *varasm;
 183
 184   /* For function.c.  */
 185
 186   /* Name of this function.  */
 187   const char *name;
 188
 189   /* Points to the FUNCTION_DECL of this function.  */
 190   tree decl;
 191
 192   /* Function containing this function, if any.  */
 193   struct function *outer;
 194
 195   /* Number of bytes of args popped by function being compiled on its return.
 196      Zero if no bytes are to be popped.
 197      May affect compilation of return insn or of function epilogue.  */
 198   int pops_args;
 199
 200   /* If function's args have a fixed size, this is that size, in bytes.
 201      Otherwise, it is -1.
 202      May affect compilation of return insn or of function epilogue.  */
 203   int args_size;
 204
 205   /* # bytes the prologue should push and pretend that the caller pushed them.
 206      The prologue must do this, but only if parms can be passed in
 207      registers.  */
 208   int pretend_args_size;
 209
 210   /* # of bytes of outgoing arguments.  If ACCUMULATE_OUTGOING_ARGS is
 211      defined, the needed space is pushed by the prologue.  */
 212   int outgoing_args_size;
 213
 214   /* This is the offset from the arg pointer to the place where the first
 215      anonymous arg can be found, if there is one.  */
 216   rtx arg_offset_rtx;
 217
 218   /* Quantities of various kinds of registers
 219      used for the current function's args.  */
 220   CUMULATIVE_ARGS args_info;
 221
 222   /* If nonzero, an RTL expression for the location at which the current
 223      function returns its result.  If the current function returns its
 224      result in a register, current_function_return_rtx will always be
 225      the hard register containing the result.  */
 226   rtx return_rtx;
 227
 228   /* The arg pointer hard register, or the pseudo into which it was copied.  */
 229   rtx internal_arg_pointer;
 230
 231   /* Language-specific reason why the current function cannot be made
 232      inline.  */
 233   const char *cannot_inline;
 234
 235   /* Opaque pointer used by get_hard_reg_initial_val and
 236      has_hard_reg_initial_val (see integrate.[hc]).  */
 237   struct initial_value_struct *hard_reg_initial_vals;
 238
 239   /* Number of function calls seen so far in current function.  */
 240   int x_function_call_count;
 241
 242   /* List (chain of TREE_LIST) of LABEL_DECLs for all nonlocal labels
 243      (labels to which there can be nonlocal gotos from nested functions)
 244      in this function.  */
 245   tree x_nonlocal_labels;
 246
 247   /* List (chain of EXPR_LIST) of stack slots that hold the current handlers
 248      for nonlocal gotos.  There is one for every nonlocal label in the
 249      function; this list matches the one in nonlocal_labels.
 250      Zero when function does not have nonlocal labels.  */
 251   rtx x_nonlocal_goto_handler_slots;
 252
 253   /* List (chain of EXPR_LIST) of labels heading the current handlers for
 254      nonlocal gotos.  */
 255   rtx x_nonlocal_goto_handler_labels;
 256
 257   /* RTX for stack slot that holds the stack pointer value to restore
 258      for a nonlocal goto.
 259      Zero when function does not have nonlocal labels.  */
 260   rtx x_nonlocal_goto_stack_level;
 261
 262   /* Label that will go on parm cleanup code, if any.
 263      Jumping to this label runs cleanup code for parameters, if
 264      such code must be run.  Following this code is the logical return
 265      label.  */
 266   rtx x_cleanup_label;
 267
 268   /* Label that will go on function epilogue.
 269      Jumping to this label serves as a "return" instruction
 270      on machines which require execution of the epilogue on all returns.  */
 271   rtx x_return_label;
 272
 273   /* Label that will go on the end of function epilogue.
 274      Jumping to this label serves as a "naked return" instruction
 275      on machines which require execution of the epilogue on all returns.  */
 276   rtx x_naked_return_label;
 277
 278   /* Label and register for unswitching computed gotos.  */
 279   rtx computed_goto_common_label;
 280   rtx computed_goto_common_reg;
 281
 282   /* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs.
 283      So we can mark them all live at the end of the function, if nonopt.  */
 284   rtx x_save_expr_regs;
 285
 286   /* List (chain of EXPR_LISTs) of all stack slots in this function.
 287      Made for the sake of unshare_all_rtl.  */
 288   rtx x_stack_slot_list;
 289
 290   /* Chain of all RTL_EXPRs that have insns in them.  */
 291   tree x_rtl_expr_chain;
 292
 293   /* Label to jump back to for tail recursion, or 0 if we have
 294      not yet needed one for this function.  */
 295   rtx x_tail_recursion_label;
 296
 297   /* Place after which to insert the tail_recursion_label if we need one.  */
 298   rtx x_tail_recursion_reentry;
 299
 300   /* Location at which to save the argument pointer if it will need to be
 301      referenced.  There are two cases where this is done: if nonlocal gotos
 302      exist, or if vars stored at an offset from the argument pointer will be
 303      needed by inner routines.  */
 304   rtx x_arg_pointer_save_area;
 305
 306   /* If the function returns non-void, we will emit a clobber of the
 307      return registers just in case the user fell off the end without
 308      returning a proper value.  This is that insn.  */
 309   rtx x_clobber_return_insn;
 310
 311   /* Offset to end of allocated area of stack frame.
 312      If stack grows down, this is the address of the last stack slot allocated.
 313      If stack grows up, this is the address for the next slot.  */
 314   HOST_WIDE_INT x_frame_offset;
 315
 316   /* List (chain of TREE_LISTs) of static chains for containing functions.
 317      Each link has a FUNCTION_DECL in the TREE_PURPOSE and a reg rtx
 318      in an RTL_EXPR in the TREE_VALUE.  */
 319   tree x_context_display;
 320
 321   /* List (chain of TREE_LISTs) of trampolines for nested functions.
 322      The trampoline sets up the static chain and jumps to the function.
 323      We supply the trampoline's address when the function's address is
 324      requested.
 325
 326      Each link has a FUNCTION_DECL in the TREE_PURPOSE and a reg rtx
 327      in an RTL_EXPR in the TREE_VALUE.  */
 328   tree x_trampoline_list;
 329
 330   /* Insn after which register parms and SAVE_EXPRs are born, if nonopt.  */
 331   rtx x_parm_birth_insn;
 332
 333   /* Last insn of those whose job was to put parms into their nominal
 334      homes.  */
 335   rtx x_last_parm_insn;
 336
 337   /* 1 + last pseudo register number possibly used for loading a copy
 338      of a parameter of this function.  */
 339   unsigned int x_max_parm_reg;
 340
 341   /* Vector indexed by REGNO, containing location on stack in which
 342      to put the parm which is nominally in pseudo register REGNO,
 343      if we discover that that parm must go in the stack.  The highest
 344      element in this vector is one less than MAX_PARM_REG, above.  */
 345   rtx * GTY ((length ("%h.x_max_parm_reg"))) x_parm_reg_stack_loc;
 346
 347   /* List of all temporaries allocated, both available and in use.  */
 348   struct temp_slot *x_temp_slots;
 349
 350   /* Current nesting level for temporaries.  */
 351   int x_temp_slot_level;
 352
 353   /* Current nesting level for variables in a block.  */
 354   int x_var_temp_slot_level;
 355
 356   /* When temporaries are created by TARGET_EXPRs, they are created at
 357      this level of temp_slot_level, so that they can remain allocated
 358      until no longer needed.  CLEANUP_POINT_EXPRs define the lifetime
 359      of TARGET_EXPRs.  */
 360   int x_target_temp_slot_level;
 361
 362   /* This slot is initialized as 0 and is added to
 363      during the nested function.  */
 364   struct var_refs_queue *fixup_var_refs_queue;
 365
 366   /* For integrate.c.  */
 367   int inlinable;
 368   int no_debugging_symbols;
 369   rtvec original_arg_vector;
 370   tree original_decl_initial;
 371   /* Last insn of those whose job was to put parms into their nominal
 372      homes.  */
 373   rtx inl_last_parm_insn;
 374   /* Highest label number in current function.  */
 375   int inl_max_label_num;
 376
 377   /* Function sequence number for profiling, debugging, etc.  */
 378   int funcdef_no;
 379
 380   /* For md files.  */
 381
 382   /* tm.h can use this to store whatever it likes.  */
 383   struct machine_function * GTY ((maybe_undef (""))) machine;
 384   /* The largest alignment of slot allocated on the stack.  */
 385   int stack_alignment_needed;
 386   /* Preferred alignment of the end of stack frame.  */
 387   int preferred_stack_boundary;
 388   /* Set when the call to function itself has been emit.  */
 389   bool recursive_call_emit;
 390
 391   /* Language-specific code can use this to store whatever it likes.  */
 392   struct language_function * language;
 393
 394   /* For reorg.  */
 395
 396   /* If some insns can be deferred to the delay slots of the epilogue, the
 397      delay list for them is recorded here.  */
 398   rtx epilogue_delay_list;
 399
 400   /* How commonly executed the function is.  Initialized during branch
 401      probabilities pass.  */
 402   enum function_frequency {
 403     /* This function most likely won't be executed at all.
 404        (set only when profile feedback is available).  */
 405     FUNCTION_FREQUENCY_UNLIKELY_EXECUTED,
 406     /* The default value.  */
 407     FUNCTION_FREQUENCY_NORMAL,
 408     /* Optimize this function hard
 409        (set only when profile feedback is available).  */
 410     FUNCTION_FREQUENCY_HOT
 411   } function_frequency;
 412
 413   /* Maximal number of entities in the single jumptable.  Used to estimate
 414      final flowgraph size.  */
 415   int max_jumptable_ents;
 416
 417   /* Collected bit flags.  */
 418
 419   /* Nonzero if function being compiled needs to be given an address
 420      where the value should be stored.  */
 421   unsigned int returns_struct : 1;
 422
 423   /* Nonzero if function being compiled needs to
 424      return the address of where it has put a structure value.  */
 425   unsigned int returns_pcc_struct : 1;
 426
 427   /* Nonzero if the current function returns a pointer type.  */
 428   unsigned int returns_pointer : 1;
 429
 430   /* Nonzero if function being compiled needs to be passed a static chain.  */
 431   unsigned int needs_context : 1;
 432
 433   /* Nonzero if function being compiled can call setjmp.  */
 434   unsigned int calls_setjmp : 1;
 435
 436   /* Nonzero if function being compiled can call longjmp.  */
 437   unsigned int calls_longjmp : 1;
 438
 439   /* Nonzero if function being compiled can call alloca,
 440      either as a subroutine or builtin.  */
 441   unsigned int calls_alloca : 1;
 442
 443   /* Nonzero if the function calls __builtin_eh_return.  */
 444   unsigned int calls_eh_return : 1;
 445
 446   /* Nonzero if the function calls __builtin_constant_p.  */
 447   unsigned int calls_constant_p : 1;
 448
 449   /* Nonzero if function being compiled receives nonlocal gotos
 450      from nested functions.  */
 451   unsigned int has_nonlocal_label : 1;
 452
 453   /* Nonzero if function being compiled has nonlocal gotos to parent
 454      function.  */
 455   unsigned int has_nonlocal_goto : 1;
 456
 457   /* Nonzero if function being compiled contains nested functions.  */
 458   unsigned int contains_functions : 1;
 459
 460   /* Nonzero if the function being compiled issues a computed jump.  */
 461   unsigned int has_computed_jump : 1;
 462
 463   /* Nonzero if the current function is a thunk (a lightweight function that
 464      just adjusts one of its arguments and forwards to another function), so
 465      we should try to cut corners where we can.  */
 466   unsigned int is_thunk : 1;
 467
 468   /* This bit is used by the exception handling logic.  It is set if all
 469      calls (if any) are sibling calls.  Such functions do not have to
 470      have EH tables generated, as they cannot throw.  A call to such a
 471      function, however, should be treated as throwing if any of its callees
 472      can throw.  */
 473   unsigned int all_throwers_are_sibcalls : 1;
 474
 475   /* Nonzero if instrumentation calls for function entry and exit should be
 476      generated.  */
 477   unsigned int instrument_entry_exit : 1;
 478
 479   /* Nonzero if profiling code should be generated.  */
 480   unsigned int profile : 1;
 481
 482   /* Nonzero if stack limit checking should be enabled in the current
 483      function.  */
 484   unsigned int limit_stack : 1;
 485
 486   /* Nonzero if current function uses stdarg.h or equivalent.  */
 487   unsigned int stdarg : 1;
 488
 489   /* Nonzero if this function is being processed in function-at-a-time
 490      mode.  In other words, if all tree structure for this function,
 491      including the BLOCK tree, is created before RTL generation
 492      commences.  */
 493   unsigned int x_whole_function_mode_p : 1;
 494
 495   /* Nonzero if the back-end should not keep track of expressions that
 496      determine the size of variable-sized objects.  Normally, such
 497      expressions are saved away, and then expanded when the next
 498      function is started.  For example, if a parameter has a
 499      variable-sized type, then the size of the parameter is computed
 500      when the function body is entered.  However, some front-ends do
 501      not desire this behavior.  */
 502   unsigned int x_dont_save_pending_sizes_p : 1;
 503
 504   /* Nonzero if the current function uses the constant pool.  */
 505   unsigned int uses_const_pool : 1;
 506
 507   /* Nonzero if the current function uses pic_offset_table_rtx.  */
 508   unsigned int uses_pic_offset_table : 1;
 509
 510   /* Nonzero if the current function needs an lsda for exception handling.  */
 511   unsigned int uses_eh_lsda : 1;
 512
 513   /* Nonzero if code to initialize arg_pointer_save_area has been emitted.  */
 514   unsigned int arg_pointer_save_area_init : 1;
 515
 516   /* Flag for use by ther rtl inliner, to tell if the function has been
 517      processed at least once.  */
 518   unsigned int rtl_inline_init : 1;
 519
 520   /* Nonzero if the rtl inliner has saved the function for inlining.  */
 521   unsigned int saved_for_inline : 1;
 522 };
 523
 524 /* The function currently being compiled.  */
 525 extern GTY(()) struct function *cfun;
 526
 527 /* Pointer to chain of `struct function' for containing functions.  */
 528 extern GTY(()) struct function *outer_function_chain;
 529
 530 /* Nonzero if we've already converted virtual regs to hard regs.  */
 531 extern int virtuals_instantiated;
 532
 533 /* Nonzero if at least one trampoline has been created.  */
 534 extern int trampolines_created;
 535
 536 /* For backward compatibility... eventually these should all go away.  */
 537 #define current_function_name (cfun->name)
 538 #define current_function_pops_args (cfun->pops_args)
 539 #define current_function_returns_struct (cfun->returns_struct)
 540 #define current_function_returns_pcc_struct (cfun->returns_pcc_struct)
 541 #define current_function_returns_pointer (cfun->returns_pointer)
 542 #define current_function_needs_context (cfun->needs_context)
 543 #define current_function_calls_setjmp (cfun->calls_setjmp)
 544 #define current_function_calls_alloca (cfun->calls_alloca)
 545 #define current_function_calls_longjmp (cfun->calls_longjmp)
 546 #define current_function_calls_eh_return (cfun->calls_eh_return)
 547 #define current_function_calls_constant_p (cfun->calls_constant_p)
 548 #define current_function_has_computed_jump (cfun->has_computed_jump)
 549 #define current_function_contains_functions (cfun->contains_functions)
 550 #define current_function_is_thunk (cfun->is_thunk)
 551 #define current_function_args_info (cfun->args_info)
 552 #define current_function_args_size (cfun->args_size)
 553 #define current_function_pretend_args_size (cfun->pretend_args_size)
 554 #define current_function_outgoing_args_size (cfun->outgoing_args_size)
 555 #define current_function_arg_offset_rtx (cfun->arg_offset_rtx)
 556 #define current_function_stdarg (cfun->stdarg)
 557 #define current_function_internal_arg_pointer (cfun->internal_arg_pointer)
 558 #define current_function_return_rtx (cfun->return_rtx)
 559 #define current_function_instrument_entry_exit (cfun->instrument_entry_exit)
 560 #define current_function_profile (cfun->profile)
 561 #define current_function_funcdef_no (cfun->funcdef_no)
 562 #define current_function_limit_stack (cfun->limit_stack)
 563 #define current_function_uses_pic_offset_table (cfun->uses_pic_offset_table)
 564 #define current_function_uses_const_pool (cfun->uses_const_pool)
 565 #define current_function_cannot_inline (cfun->cannot_inline)
 566 #define current_function_epilogue_delay_list (cfun->epilogue_delay_list)
 567 #define current_function_has_nonlocal_label (cfun->has_nonlocal_label)
 568 #define current_function_has_nonlocal_goto (cfun->has_nonlocal_goto)
 569
 570 #define max_parm_reg (cfun->x_max_parm_reg)
 571 #define parm_reg_stack_loc (cfun->x_parm_reg_stack_loc)
 572 #define cleanup_label (cfun->x_cleanup_label)
 573 #define return_label (cfun->x_return_label)
 574 #define naked_return_label (cfun->x_naked_return_label)
 575 #define save_expr_regs (cfun->x_save_expr_regs)
 576 #define stack_slot_list (cfun->x_stack_slot_list)
 577 #define parm_birth_insn (cfun->x_parm_birth_insn)
 578 #define frame_offset (cfun->x_frame_offset)
 579 #define tail_recursion_label (cfun->x_tail_recursion_label)
 580 #define tail_recursion_reentry (cfun->x_tail_recursion_reentry)
 581 #define arg_pointer_save_area (cfun->x_arg_pointer_save_area)
 582 #define rtl_expr_chain (cfun->x_rtl_expr_chain)
 583 #define last_parm_insn (cfun->x_last_parm_insn)
 584 #define context_display (cfun->x_context_display)
 585 #define trampoline_list (cfun->x_trampoline_list)
 586 #define function_call_count (cfun->x_function_call_count)
 587 #define temp_slots (cfun->x_temp_slots)
 588 #define temp_slot_level (cfun->x_temp_slot_level)
 589 #define target_temp_slot_level (cfun->x_target_temp_slot_level)
 590 #define var_temp_slot_level (cfun->x_var_temp_slot_level)
 591 #define nonlocal_labels (cfun->x_nonlocal_labels)
 592 #define nonlocal_goto_handler_slots (cfun->x_nonlocal_goto_handler_slots)
 593 #define nonlocal_goto_handler_labels (cfun->x_nonlocal_goto_handler_labels)
 594 #define nonlocal_goto_stack_level (cfun->x_nonlocal_goto_stack_level)
 595
 596 /* The FUNCTION_DECL for an inline function currently being expanded.  */
 597 extern tree inline_function_decl;
 598
 599 /* Given a function decl for a containing function,
 600    return the `struct function' for it.  */
 601 struct function *find_function_data (tree);
 602
 603 /* Set NOTE_BLOCK for each block note in the current function.  */
 604 extern void identify_blocks (void);
 605
 606 /* Identify BLOCKs referenced by more than one NOTE_INSN_BLOCK_{BEG,END},
 607    and create duplicate blocks.  */
 608 extern void reorder_blocks (void);
 609
 610 /* Set BLOCK_NUMBER for all the blocks in FN.  */
 611 extern void number_blocks (tree);
 612
 613 /* Return size needed for stack frame based on slots so far allocated.
 614    This size counts from zero.  It is not rounded to STACK_BOUNDARY;
 615    the caller may have to do that.  */
 616 extern HOST_WIDE_INT get_frame_size (void);
 617 /* Likewise, but for a different than the current function.  */
 618 extern HOST_WIDE_INT get_func_frame_size (struct function *);
 619
 620 /* A pointer to a function to create target specific, per-function
 621    data structures.  */
 622 extern struct machine_function * (*init_machine_status) (void);
 623
 624 /* Save and restore status information for a nested function.  */
 625 extern void restore_emit_status (struct function *);
 626 extern void free_after_parsing (struct function *);
 627 extern void free_after_compilation (struct function *);
 628
 629 extern void init_varasm_status (struct function *);
 630
 631 #ifdef RTX_CODE
 632 extern void diddle_return_value (void (*)(rtx, void*), void*);
 633 extern void clobber_return_register (void);
 634 extern void use_return_register (void);
 635 #endif
 636
 637 extern rtx get_arg_pointer_save_area (struct function *);
 638
 639 extern void init_virtual_regs (struct emit_status *);
 640
 641 /* Called once, at initialization, to initialize function.c.  */
 642 extern void init_function_once (void);
 643
 644 #endif  /* GCC_FUNCTION_H */