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 and register for unswitching computed gotos.  */
 274   rtx computed_goto_common_label;
 275   rtx computed_goto_common_reg;
 276
 277   /* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs.
 278      So we can mark them all live at the end of the function, if nonopt.  */
 279   rtx x_save_expr_regs;
 280
 281   /* List (chain of EXPR_LISTs) of all stack slots in this function.
 282      Made for the sake of unshare_all_rtl.  */
 283   rtx x_stack_slot_list;
 284
 285   /* Chain of all RTL_EXPRs that have insns in them.  */
 286   tree x_rtl_expr_chain;
 287
 288   /* Label to jump back to for tail recursion, or 0 if we have
 289      not yet needed one for this function.  */
 290   rtx x_tail_recursion_label;
 291
 292   /* Place after which to insert the tail_recursion_label if we need one.  */
 293   rtx x_tail_recursion_reentry;
 294
 295   /* Location at which to save the argument pointer if it will need to be
 296      referenced.  There are two cases where this is done: if nonlocal gotos
 297      exist, or if vars stored at an offset from the argument pointer will be
 298      needed by inner routines.  */
 299   rtx x_arg_pointer_save_area;
 300
 301   /* If the function returns non-void, we will emit a clobber of the
 302      return registers just in case the user fell off the end without
 303      returning a proper value.  This is that insn.  */
 304   rtx x_clobber_return_insn;
 305
 306   /* Offset to end of allocated area of stack frame.
 307      If stack grows down, this is the address of the last stack slot allocated.
 308      If stack grows up, this is the address for the next slot.  */
 309   HOST_WIDE_INT x_frame_offset;
 310
 311   /* List (chain of TREE_LISTs) of static chains for containing functions.
 312      Each link has a FUNCTION_DECL in the TREE_PURPOSE and a reg rtx
 313      in an RTL_EXPR in the TREE_VALUE.  */
 314   tree x_context_display;
 315
 316   /* List (chain of TREE_LISTs) of trampolines for nested functions.
 317      The trampoline sets up the static chain and jumps to the function.
 318      We supply the trampoline's address when the function's address is
 319      requested.
 320
 321      Each link has a FUNCTION_DECL in the TREE_PURPOSE and a reg rtx
 322      in an RTL_EXPR in the TREE_VALUE.  */
 323   tree x_trampoline_list;
 324
 325   /* Insn after which register parms and SAVE_EXPRs are born, if nonopt.  */
 326   rtx x_parm_birth_insn;
 327
 328   /* Last insn of those whose job was to put parms into their nominal
 329      homes.  */
 330   rtx x_last_parm_insn;
 331
 332   /* 1 + last pseudo register number possibly used for loading a copy
 333      of a parameter of this function.  */
 334   unsigned int x_max_parm_reg;
 335
 336   /* Vector indexed by REGNO, containing location on stack in which
 337      to put the parm which is nominally in pseudo register REGNO,
 338      if we discover that that parm must go in the stack.  The highest
 339      element in this vector is one less than MAX_PARM_REG, above.  */
 340   rtx * GTY ((length ("%h.x_max_parm_reg"))) x_parm_reg_stack_loc;
 341
 342   /* List of all temporaries allocated, both available and in use.  */
 343   struct temp_slot *x_temp_slots;
 344
 345   /* Current nesting level for temporaries.  */
 346   int x_temp_slot_level;
 347
 348   /* Current nesting level for variables in a block.  */
 349   int x_var_temp_slot_level;
 350
 351   /* When temporaries are created by TARGET_EXPRs, they are created at
 352      this level of temp_slot_level, so that they can remain allocated
 353      until no longer needed.  CLEANUP_POINT_EXPRs define the lifetime
 354      of TARGET_EXPRs.  */
 355   int x_target_temp_slot_level;
 356
 357   /* This slot is initialized as 0 and is added to
 358      during the nested function.  */
 359   struct var_refs_queue *fixup_var_refs_queue;
 360
 361   /* For integrate.c.  */
 362   int inlinable;
 363   int no_debugging_symbols;
 364   rtvec 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   /* Function sequence number for profiling, debugging, etc.  */
 373   int funcdef_no;
 374
 375   /* For md files.  */
 376
 377   /* tm.h can use this to store whatever it likes.  */
 378   struct machine_function * GTY ((maybe_undef (""))) machine;
 379   /* The largest alignment of slot allocated on the stack.  */
 380   int stack_alignment_needed;
 381   /* Preferred alignment of the end of stack frame.  */
 382   int preferred_stack_boundary;
 383   /* Set when the call to function itself has been emit.  */
 384   bool recursive_call_emit;
 385
 386   /* Language-specific code can use this to store whatever it likes.  */
 387   struct language_function * language;
 388
 389   /* For reorg.  */
 390
 391   /* If some insns can be deferred to the delay slots of the epilogue, the
 392      delay list for them is recorded here.  */
 393   rtx epilogue_delay_list;
 394
 395   /* How commonly executed the function is.  Initialized during branch
 396      probabilities pass.  */
 397   enum function_frequency {
 398     /* This function most likely won't be executed at all.
 399        (set only when profile feedback is available).  */
 400     FUNCTION_FREQUENCY_UNLIKELY_EXECUTED,
 401     /* The default value.  */
 402     FUNCTION_FREQUENCY_NORMAL,
 403     /* Optimize this function hard
 404        (set only when profile feedback is available).  */
 405     FUNCTION_FREQUENCY_HOT
 406   } function_frequency;
 407
 408   /* Maximal number of entities in the single jumptable.  Used to estimate
 409      final flowgraph size.  */
 410   int max_jumptable_ents;
 411
 412   /* Collected bit flags.  */
 413
 414   /* Nonzero if function being compiled needs to be given an address
 415      where the value should be stored.  */
 416   unsigned int returns_struct : 1;
 417
 418   /* Nonzero if function being compiled needs to
 419      return the address of where it has put a structure value.  */
 420   unsigned int returns_pcc_struct : 1;
 421
 422   /* Nonzero if the current function returns a pointer type.  */
 423   unsigned int returns_pointer : 1;
 424
 425   /* Nonzero if function being compiled needs to be passed a static chain.  */
 426   unsigned int needs_context : 1;
 427
 428   /* Nonzero if function being compiled can call setjmp.  */
 429   unsigned int calls_setjmp : 1;
 430
 431   /* Nonzero if function being compiled can call longjmp.  */
 432   unsigned int calls_longjmp : 1;
 433
 434   /* Nonzero if function being compiled can call alloca,
 435      either as a subroutine or builtin.  */
 436   unsigned int calls_alloca : 1;
 437
 438   /* Nonzero if the function calls __builtin_eh_return.  */
 439   unsigned int calls_eh_return : 1;
 440
 441   /* Nonzero if the function calls __builtin_constant_p.  */
 442   unsigned int calls_constant_p : 1;
 443
 444   /* Nonzero if function being compiled receives nonlocal gotos
 445      from nested functions.  */
 446   unsigned int has_nonlocal_label : 1;
 447
 448   /* Nonzero if function being compiled has nonlocal gotos to parent
 449      function.  */
 450   unsigned int has_nonlocal_goto : 1;
 451
 452   /* Nonzero if function being compiled contains nested functions.  */
 453   unsigned int contains_functions : 1;
 454
 455   /* Nonzero if the function being compiled issues a computed jump.  */
 456   unsigned int has_computed_jump : 1;
 457
 458   /* Nonzero if the current function is a thunk (a lightweight function that
 459      just adjusts one of its arguments and forwards to another function), so
 460      we should try to cut corners where we can.  */
 461   unsigned int is_thunk : 1;
 462
 463   /* This bit is used by the exception handling logic.  It is set if all
 464      calls (if any) are sibling calls.  Such functions do not have to
 465      have EH tables generated, as they cannot throw.  A call to such a
 466      function, however, should be treated as throwing if any of its callees
 467      can throw.  */
 468   unsigned int all_throwers_are_sibcalls : 1;
 469
 470   /* Nonzero if instrumentation calls for function entry and exit should be
 471      generated.  */
 472   unsigned int instrument_entry_exit : 1;
 473
 474   /* Nonzero if profiling code should be generated.  */
 475   unsigned int profile : 1;
 476
 477   /* Nonzero if stack limit checking should be enabled in the current
 478      function.  */
 479   unsigned int limit_stack : 1;
 480
 481   /* Nonzero if current function uses stdarg.h or equivalent.  */
 482   unsigned int stdarg : 1;
 483
 484   /* Nonzero if this function is being processed in function-at-a-time
 485      mode.  In other words, if all tree structure for this function,
 486      including the BLOCK tree, is created before RTL generation
 487      commences.  */
 488   unsigned int x_whole_function_mode_p : 1;
 489
 490   /* Nonzero if the back-end should not keep track of expressions that
 491      determine the size of variable-sized objects.  Normally, such
 492      expressions are saved away, and then expanded when the next
 493      function is started.  For example, if a parameter has a
 494      variable-sized type, then the size of the parameter is computed
 495      when the function body is entered.  However, some front-ends do
 496      not desire this behavior.  */
 497   unsigned int x_dont_save_pending_sizes_p : 1;
 498
 499   /* Nonzero if the current function uses the constant pool.  */
 500   unsigned int uses_const_pool : 1;
 501
 502   /* Nonzero if the current function uses pic_offset_table_rtx.  */
 503   unsigned int uses_pic_offset_table : 1;
 504
 505   /* Nonzero if the current function needs an lsda for exception handling.  */
 506   unsigned int uses_eh_lsda : 1;
 507
 508   /* Nonzero if code to initialize arg_pointer_save_area has been emitted.  */
 509   unsigned int arg_pointer_save_area_init : 1;
 510
 511   /* Flag for use by ther rtl inliner, to tell if the function has been
 512      processed at least once.  */
 513   unsigned int rtl_inline_init : 1;
 514
 515   /* Nonzero if the rtl inliner has saved the function for inlining.  */
 516   unsigned int saved_for_inline : 1;
 517 };
 518
 519 /* The function currently being compiled.  */
 520 extern GTY(()) struct function *cfun;
 521
 522 /* Pointer to chain of `struct function' for containing functions.  */
 523 extern GTY(()) struct function *outer_function_chain;
 524
 525 /* Nonzero if we've already converted virtual regs to hard regs.  */
 526 extern int virtuals_instantiated;
 527
 528 /* Nonzero if at least one trampoline has been created.  */
 529 extern int trampolines_created;
 530
 531 /* For backward compatibility... eventually these should all go away.  */
 532 #define current_function_name (cfun->name)
 533 #define current_function_pops_args (cfun->pops_args)
 534 #define current_function_returns_struct (cfun->returns_struct)
 535 #define current_function_returns_pcc_struct (cfun->returns_pcc_struct)
 536 #define current_function_returns_pointer (cfun->returns_pointer)
 537 #define current_function_needs_context (cfun->needs_context)
 538 #define current_function_calls_setjmp (cfun->calls_setjmp)
 539 #define current_function_calls_alloca (cfun->calls_alloca)
 540 #define current_function_calls_longjmp (cfun->calls_longjmp)
 541 #define current_function_calls_eh_return (cfun->calls_eh_return)
 542 #define current_function_calls_constant_p (cfun->calls_constant_p)
 543 #define current_function_has_computed_jump (cfun->has_computed_jump)
 544 #define current_function_contains_functions (cfun->contains_functions)
 545 #define current_function_is_thunk (cfun->is_thunk)
 546 #define current_function_args_info (cfun->args_info)
 547 #define current_function_args_size (cfun->args_size)
 548 #define current_function_pretend_args_size (cfun->pretend_args_size)
 549 #define current_function_outgoing_args_size (cfun->outgoing_args_size)
 550 #define current_function_arg_offset_rtx (cfun->arg_offset_rtx)
 551 #define current_function_stdarg (cfun->stdarg)
 552 #define current_function_internal_arg_pointer (cfun->internal_arg_pointer)
 553 #define current_function_return_rtx (cfun->return_rtx)
 554 #define current_function_instrument_entry_exit (cfun->instrument_entry_exit)
 555 #define current_function_profile (cfun->profile)
 556 #define current_function_funcdef_no (cfun->funcdef_no)
 557 #define current_function_limit_stack (cfun->limit_stack)
 558 #define current_function_uses_pic_offset_table (cfun->uses_pic_offset_table)
 559 #define current_function_uses_const_pool (cfun->uses_const_pool)
 560 #define current_function_cannot_inline (cfun->cannot_inline)
 561 #define current_function_epilogue_delay_list (cfun->epilogue_delay_list)
 562 #define current_function_has_nonlocal_label (cfun->has_nonlocal_label)
 563 #define current_function_has_nonlocal_goto (cfun->has_nonlocal_goto)
 564
 565 #define max_parm_reg (cfun->x_max_parm_reg)
 566 #define parm_reg_stack_loc (cfun->x_parm_reg_stack_loc)
 567 #define cleanup_label (cfun->x_cleanup_label)
 568 #define return_label (cfun->x_return_label)
 569 #define save_expr_regs (cfun->x_save_expr_regs)
 570 #define stack_slot_list (cfun->x_stack_slot_list)
 571 #define parm_birth_insn (cfun->x_parm_birth_insn)
 572 #define frame_offset (cfun->x_frame_offset)
 573 #define tail_recursion_label (cfun->x_tail_recursion_label)
 574 #define tail_recursion_reentry (cfun->x_tail_recursion_reentry)
 575 #define arg_pointer_save_area (cfun->x_arg_pointer_save_area)
 576 #define rtl_expr_chain (cfun->x_rtl_expr_chain)
 577 #define last_parm_insn (cfun->x_last_parm_insn)
 578 #define context_display (cfun->x_context_display)
 579 #define trampoline_list (cfun->x_trampoline_list)
 580 #define function_call_count (cfun->x_function_call_count)
 581 #define temp_slots (cfun->x_temp_slots)
 582 #define temp_slot_level (cfun->x_temp_slot_level)
 583 #define target_temp_slot_level (cfun->x_target_temp_slot_level)
 584 #define var_temp_slot_level (cfun->x_var_temp_slot_level)
 585 #define nonlocal_labels (cfun->x_nonlocal_labels)
 586 #define nonlocal_goto_handler_slots (cfun->x_nonlocal_goto_handler_slots)
 587 #define nonlocal_goto_handler_labels (cfun->x_nonlocal_goto_handler_labels)
 588 #define nonlocal_goto_stack_level (cfun->x_nonlocal_goto_stack_level)
 589
 590 /* The FUNCTION_DECL for an inline function currently being expanded.  */
 591 extern tree inline_function_decl;
 592
 593 /* Given a function decl for a containing function,
 594    return the `struct function' for it.  */
 595 struct function *find_function_data (tree);
 596
 597 /* Set NOTE_BLOCK for each block note in the current function.  */
 598 extern void identify_blocks (void);
 599
 600 /* Identify BLOCKs referenced by more than one NOTE_INSN_BLOCK_{BEG,END},
 601    and create duplicate blocks.  */
 602 extern void reorder_blocks (void);
 603
 604 /* Set BLOCK_NUMBER for all the blocks in FN.  */
 605 extern void number_blocks (tree);
 606
 607 /* Return size needed for stack frame based on slots so far allocated.
 608    This size counts from zero.  It is not rounded to STACK_BOUNDARY;
 609    the caller may have to do that.  */
 610 extern HOST_WIDE_INT get_frame_size (void);
 611 /* Likewise, but for a different than the current function.  */
 612 extern HOST_WIDE_INT get_func_frame_size (struct function *);
 613
 614 /* A pointer to a function to create target specific, per-function
 615    data structures.  */
 616 extern struct machine_function * (*init_machine_status) (void);
 617
 618 /* Save and restore status information for a nested function.  */
 619 extern void restore_emit_status (struct function *);
 620 extern void free_after_parsing (struct function *);
 621 extern void free_after_compilation (struct function *);
 622
 623 extern void init_varasm_status (struct function *);
 624
 625 #ifdef RTX_CODE
 626 extern void diddle_return_value (void (*)(rtx, void*), void*);
 627 extern void clobber_return_register (void);
 628 extern void use_return_register (void);
 629 #endif
 630
 631 extern rtx get_arg_pointer_save_area (struct function *);
 632
 633 extern void init_virtual_regs (struct emit_status *);
 634
 635 /* Called once, at initialization, to initialize function.c.  */
 636 extern void init_function_once (void);
 637
 638 #endif  /* GCC_FUNCTION_H */