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, 2004 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 tree-optimize.c.  */
 185
 186   /* Saved tree and arguments during tree optimization.  Used later for
 187      inlining */
 188   tree saved_tree;
 189   tree saved_args;
 190
 191   /* For function.c.  */
 192
 193   /* Points to the FUNCTION_DECL of this function.  */
 194   tree decl;
 195
 196   /* Function containing this function, if any.  */
 197   struct function *outer;
 198
 199   /* Number of bytes of args popped by function being compiled on its return.
 200      Zero if no bytes are to be popped.
 201      May affect compilation of return insn or of function epilogue.  */
 202   int pops_args;
 203
 204   /* If function's args have a fixed size, this is that size, in bytes.
 205      Otherwise, it is -1.
 206      May affect compilation of return insn or of function epilogue.  */
 207   int args_size;
 208
 209   /* # bytes the prologue should push and pretend that the caller pushed them.
 210      The prologue must do this, but only if parms can be passed in
 211      registers.  */
 212   int pretend_args_size;
 213
 214   /* # of bytes of outgoing arguments.  If ACCUMULATE_OUTGOING_ARGS is
 215      defined, the needed space is pushed by the prologue.  */
 216   int outgoing_args_size;
 217
 218   /* This is the offset from the arg pointer to the place where the first
 219      anonymous arg can be found, if there is one.  */
 220   rtx arg_offset_rtx;
 221
 222   /* Quantities of various kinds of registers
 223      used for the current function's args.  */
 224   CUMULATIVE_ARGS args_info;
 225
 226   /* If nonzero, an RTL expression for the location at which the current
 227      function returns its result.  If the current function returns its
 228      result in a register, current_function_return_rtx will always be
 229      the hard register containing the result.  */
 230   rtx return_rtx;
 231
 232   /* The arg pointer hard register, or the pseudo into which it was copied.  */
 233   rtx internal_arg_pointer;
 234
 235   /* Language-specific reason why the current function cannot be made
 236      inline.  */
 237   const char *cannot_inline;
 238
 239   /* Opaque pointer used by get_hard_reg_initial_val and
 240      has_hard_reg_initial_val (see integrate.[hc]).  */
 241   struct initial_value_struct *hard_reg_initial_vals;
 242
 243   /* Number of function calls seen so far in current function.  */
 244   int x_function_call_count;
 245
 246   /* List (chain of TREE_LIST) of LABEL_DECLs for all nonlocal labels
 247      (labels to which there can be nonlocal gotos from nested functions)
 248      in this function.  */
 249   tree x_nonlocal_labels;
 250
 251   /* List (chain of EXPR_LIST) of stack slots that hold the current handlers
 252      for nonlocal gotos.  There is one for every nonlocal label in the
 253      function; this list matches the one in nonlocal_labels.
 254      Zero when function does not have nonlocal labels.  */
 255   rtx x_nonlocal_goto_handler_slots;
 256
 257   /* List (chain of EXPR_LIST) of labels heading the current handlers for
 258      nonlocal gotos.  */
 259   rtx x_nonlocal_goto_handler_labels;
 260
 261   /* RTX for stack slot that holds the stack pointer value to restore
 262      for a nonlocal goto.
 263      Zero when function does not have nonlocal labels.  */
 264   rtx x_nonlocal_goto_stack_level;
 265
 266   /* Label that will go on parm cleanup code, if any.
 267      Jumping to this label runs cleanup code for parameters, if
 268      such code must be run.  Following this code is the logical return
 269      label.  */
 270   rtx x_cleanup_label;
 271
 272   /* Label that will go on function epilogue.
 273      Jumping to this label serves as a "return" instruction
 274      on machines which require execution of the epilogue on all returns.  */
 275   rtx x_return_label;
 276
 277   /* Label that will go on the end of function epilogue.
 278      Jumping to this label serves as a "naked return" instruction
 279      on machines which require execution of the epilogue on all returns.  */
 280   rtx x_naked_return_label;
 281
 282   /* Label and register for unswitching computed gotos.  */
 283   rtx computed_goto_common_label;
 284   rtx computed_goto_common_reg;
 285
 286   /* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs.
 287      So we can mark them all live at the end of the function, if nonopt.  */
 288   rtx x_save_expr_regs;
 289
 290   /* List (chain of EXPR_LISTs) of all stack slots in this function.
 291      Made for the sake of unshare_all_rtl.  */
 292   rtx x_stack_slot_list;
 293
 294   /* Chain of all RTL_EXPRs that have insns in them.  */
 295   tree x_rtl_expr_chain;
 296
 297   /* Label to jump back to for tail recursion, or 0 if we have
 298      not yet needed one for this function.  */
 299   rtx x_tail_recursion_label;
 300
 301   /* Place after which to insert the tail_recursion_label if we need one.  */
 302   rtx x_tail_recursion_reentry;
 303
 304   /* Location at which to save the argument pointer if it will need to be
 305      referenced.  There are two cases where this is done: if nonlocal gotos
 306      exist, or if vars stored at an offset from the argument pointer will be
 307      needed by inner routines.  */
 308   rtx x_arg_pointer_save_area;
 309
 310   /* If the function returns non-void, we will emit a clobber of the
 311      return registers just in case the user fell off the end without
 312      returning a proper value.  This is that insn.  */
 313   rtx x_clobber_return_insn;
 314
 315   /* Offset to end of allocated area of stack frame.
 316      If stack grows down, this is the address of the last stack slot allocated.
 317      If stack grows up, this is the address for the next slot.  */
 318   HOST_WIDE_INT x_frame_offset;
 319
 320   /* List (chain of TREE_LISTs) of static chains for containing functions.
 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_context_display;
 324
 325   /* List (chain of TREE_LISTs) of trampolines for nested functions.
 326      The trampoline sets up the static chain and jumps to the function.
 327      We supply the trampoline's address when the function's address is
 328      requested.
 329
 330      Each link has a FUNCTION_DECL in the TREE_PURPOSE and a reg rtx
 331      in an RTL_EXPR in the TREE_VALUE.  */
 332   tree x_trampoline_list;
 333
 334   /* Insn after which register parms and SAVE_EXPRs are born, if nonopt.  */
 335   rtx x_parm_birth_insn;
 336
 337   /* Last insn of those whose job was to put parms into their nominal
 338      homes.  */
 339   rtx x_last_parm_insn;
 340
 341   /* 1 + last pseudo register number possibly used for loading a copy
 342      of a parameter of this function.  */
 343   unsigned int x_max_parm_reg;
 344
 345   /* Vector indexed by REGNO, containing location on stack in which
 346      to put the parm which is nominally in pseudo register REGNO,
 347      if we discover that that parm must go in the stack.  The highest
 348      element in this vector is one less than MAX_PARM_REG, above.  */
 349   rtx * GTY ((length ("%h.x_max_parm_reg"))) x_parm_reg_stack_loc;
 350
 351   /* List of all temporaries allocated, both available and in use.  */
 352   struct temp_slot *x_temp_slots;
 353
 354   /* Current nesting level for temporaries.  */
 355   int x_temp_slot_level;
 356
 357   /* Current nesting level for variables in a block.  */
 358   int x_var_temp_slot_level;
 359
 360   /* When temporaries are created by TARGET_EXPRs, they are created at
 361      this level of temp_slot_level, so that they can remain allocated
 362      until no longer needed.  CLEANUP_POINT_EXPRs define the lifetime
 363      of TARGET_EXPRs.  */
 364   int x_target_temp_slot_level;
 365
 366   /* This slot is initialized as 0 and is added to
 367      during the nested function.  */
 368   struct var_refs_queue *fixup_var_refs_queue;
 369
 370   /* For integrate.c.  */
 371   int inlinable;
 372   int no_debugging_symbols;
 373   rtvec original_arg_vector;
 374   tree original_decl_initial;
 375   /* Last insn of those whose job was to put parms into their nominal
 376      homes.  */
 377   rtx inl_last_parm_insn;
 378   /* Highest label number in current function.  */
 379   int inl_max_label_num;
 380
 381   /* Function sequence number for profiling, debugging, etc.  */
 382   int funcdef_no;
 383
 384   /* For md files.  */
 385
 386   /* tm.h can use this to store whatever it likes.  */
 387   struct machine_function * GTY ((maybe_undef)) machine;
 388   /* The largest alignment of slot allocated on the stack.  */
 389   int stack_alignment_needed;
 390   /* Preferred alignment of the end of stack frame.  */
 391   int preferred_stack_boundary;
 392   /* Set when the call to function itself has been emit.  */
 393   bool recursive_call_emit;
 394
 395   /* Language-specific code can use this to store whatever it likes.  */
 396   struct language_function * language;
 397
 398   /* For reorg.  */
 399
 400   /* If some insns can be deferred to the delay slots of the epilogue, the
 401      delay list for them is recorded here.  */
 402   rtx epilogue_delay_list;
 403
 404   /* How commonly executed the function is.  Initialized during branch
 405      probabilities pass.  */
 406   enum function_frequency {
 407     /* This function most likely won't be executed at all.
 408        (set only when profile feedback is available).  */
 409     FUNCTION_FREQUENCY_UNLIKELY_EXECUTED,
 410     /* The default value.  */
 411     FUNCTION_FREQUENCY_NORMAL,
 412     /* Optimize this function hard
 413        (set only when profile feedback is available).  */
 414     FUNCTION_FREQUENCY_HOT
 415   } function_frequency;
 416
 417   /* Maximal number of entities in the single jumptable.  Used to estimate
 418      final flowgraph size.  */
 419   int max_jumptable_ents;
 420
 421   /* Collected bit flags.  */
 422
 423   /* Nonzero if function being compiled needs to be given an address
 424      where the value should be stored.  */
 425   unsigned int returns_struct : 1;
 426
 427   /* Nonzero if function being compiled needs to
 428      return the address of where it has put a structure value.  */
 429   unsigned int returns_pcc_struct : 1;
 430
 431   /* Nonzero if the current function returns a pointer type.  */
 432   unsigned int returns_pointer : 1;
 433
 434   /* Nonzero if function being compiled needs to be passed a static chain.  */
 435   unsigned int needs_context : 1;
 436
 437   /* Nonzero if function being compiled can call setjmp.  */
 438   unsigned int calls_setjmp : 1;
 439
 440   /* Nonzero if function being compiled can call longjmp.  */
 441   unsigned int calls_longjmp : 1;
 442
 443   /* Nonzero if function being compiled can call alloca,
 444      either as a subroutine or builtin.  */
 445   unsigned int calls_alloca : 1;
 446
 447   /* Nonzero if the function calls __builtin_eh_return.  */
 448   unsigned int calls_eh_return : 1;
 449
 450   /* Nonzero if the function calls __builtin_constant_p.  */
 451   unsigned int calls_constant_p : 1;
 452
 453   /* Nonzero if function being compiled receives nonlocal gotos
 454      from nested functions.  */
 455   unsigned int has_nonlocal_label : 1;
 456
 457   /* Nonzero if function being compiled has nonlocal gotos to parent
 458      function.  */
 459   unsigned int has_nonlocal_goto : 1;
 460
 461   /* Nonzero if function being compiled contains nested functions.  */
 462   unsigned int contains_functions : 1;
 463
 464   /* Nonzero if the function being compiled issues a computed jump.  */
 465   unsigned int has_computed_jump : 1;
 466
 467   /* Nonzero if the current function is a thunk, i.e., a lightweight
 468      function implemented by the output_mi_thunk hook) that just
 469      adjusts one of its arguments and forwards to another
 470      function.  */
 471   unsigned int is_thunk : 1;
 472
 473   /* This bit is used by the exception handling logic.  It is set if all
 474      calls (if any) are sibling calls.  Such functions do not have to
 475      have EH tables generated, as they cannot throw.  A call to such a
 476      function, however, should be treated as throwing if any of its callees
 477      can throw.  */
 478   unsigned int all_throwers_are_sibcalls : 1;
 479
 480   /* Nonzero if instrumentation calls for function entry and exit should be
 481      generated.  */
 482   unsigned int instrument_entry_exit : 1;
 483
 484   /* Nonzero if profiling code should be generated.  */
 485   unsigned int profile : 1;
 486
 487   /* Nonzero if stack limit checking should be enabled in the current
 488      function.  */
 489   unsigned int limit_stack : 1;
 490
 491   /* Nonzero if current function uses stdarg.h or equivalent.  */
 492   unsigned int stdarg : 1;
 493
 494   /* Nonzero if this function is being processed in function-at-a-time
 495      mode.  In other words, if all tree structure for this function,
 496      including the BLOCK tree, is created before RTL generation
 497      commences.  */
 498   unsigned int x_whole_function_mode_p : 1;
 499
 500   /* Nonzero if the back-end should not keep track of expressions that
 501      determine the size of variable-sized objects.  Normally, such
 502      expressions are saved away, and then expanded when the next
 503      function is started.  For example, if a parameter has a
 504      variable-sized type, then the size of the parameter is computed
 505      when the function body is entered.  However, some front-ends do
 506      not desire this behavior.  */
 507   unsigned int x_dont_save_pending_sizes_p : 1;
 508
 509   /* Nonzero if the current function uses the constant pool.  */
 510   unsigned int uses_const_pool : 1;
 511
 512   /* Nonzero if the current function uses pic_offset_table_rtx.  */
 513   unsigned int uses_pic_offset_table : 1;
 514
 515   /* Nonzero if the current function needs an lsda for exception handling.  */
 516   unsigned int uses_eh_lsda : 1;
 517
 518   /* Nonzero if code to initialize arg_pointer_save_area has been emitted.  */
 519   unsigned int arg_pointer_save_area_init : 1;
 520
 521   /* Flag for use by ther rtl inliner, to tell if the function has been
 522      processed at least once.  */
 523   unsigned int rtl_inline_init : 1;
 524
 525   /* Nonzero if the rtl inliner has saved the function for inlining.  */
 526   unsigned int saved_for_inline : 1;
 527 };
 528
 529 /* The function currently being compiled.  */
 530 extern GTY(()) struct function *cfun;
 531
 532 /* Pointer to chain of `struct function' for containing functions.  */
 533 extern GTY(()) struct function *outer_function_chain;
 534
 535 /* Nonzero if we've already converted virtual regs to hard regs.  */
 536 extern int virtuals_instantiated;
 537
 538 /* Nonzero if at least one trampoline has been created.  */
 539 extern int trampolines_created;
 540
 541 /* For backward compatibility... eventually these should all go away.  */
 542 #define current_function_pops_args (cfun->pops_args)
 543 #define current_function_returns_struct (cfun->returns_struct)
 544 #define current_function_returns_pcc_struct (cfun->returns_pcc_struct)
 545 #define current_function_returns_pointer (cfun->returns_pointer)
 546 #define current_function_needs_context (cfun->needs_context)
 547 #define current_function_calls_setjmp (cfun->calls_setjmp)
 548 #define current_function_calls_alloca (cfun->calls_alloca)
 549 #define current_function_calls_longjmp (cfun->calls_longjmp)
 550 #define current_function_calls_eh_return (cfun->calls_eh_return)
 551 #define current_function_calls_constant_p (cfun->calls_constant_p)
 552 #define current_function_has_computed_jump (cfun->has_computed_jump)
 553 #define current_function_contains_functions (cfun->contains_functions)
 554 #define current_function_is_thunk (cfun->is_thunk)
 555 #define current_function_args_info (cfun->args_info)
 556 #define current_function_args_size (cfun->args_size)
 557 #define current_function_pretend_args_size (cfun->pretend_args_size)
 558 #define current_function_outgoing_args_size (cfun->outgoing_args_size)
 559 #define current_function_arg_offset_rtx (cfun->arg_offset_rtx)
 560 #define current_function_stdarg (cfun->stdarg)
 561 #define current_function_internal_arg_pointer (cfun->internal_arg_pointer)
 562 #define current_function_return_rtx (cfun->return_rtx)
 563 #define current_function_instrument_entry_exit (cfun->instrument_entry_exit)
 564 #define current_function_profile (cfun->profile)
 565 #define current_function_funcdef_no (cfun->funcdef_no)
 566 #define current_function_limit_stack (cfun->limit_stack)
 567 #define current_function_uses_pic_offset_table (cfun->uses_pic_offset_table)
 568 #define current_function_uses_const_pool (cfun->uses_const_pool)
 569 #define current_function_cannot_inline (cfun->cannot_inline)
 570 #define current_function_epilogue_delay_list (cfun->epilogue_delay_list)
 571 #define current_function_has_nonlocal_label (cfun->has_nonlocal_label)
 572 #define current_function_has_nonlocal_goto (cfun->has_nonlocal_goto)
 573
 574 #define max_parm_reg (cfun->x_max_parm_reg)
 575 #define parm_reg_stack_loc (cfun->x_parm_reg_stack_loc)
 576 #define cleanup_label (cfun->x_cleanup_label)
 577 #define return_label (cfun->x_return_label)
 578 #define naked_return_label (cfun->x_naked_return_label)
 579 #define save_expr_regs (cfun->x_save_expr_regs)
 580 #define stack_slot_list (cfun->x_stack_slot_list)
 581 #define parm_birth_insn (cfun->x_parm_birth_insn)
 582 #define frame_offset (cfun->x_frame_offset)
 583 #define tail_recursion_label (cfun->x_tail_recursion_label)
 584 #define tail_recursion_reentry (cfun->x_tail_recursion_reentry)
 585 #define arg_pointer_save_area (cfun->x_arg_pointer_save_area)
 586 #define rtl_expr_chain (cfun->x_rtl_expr_chain)
 587 #define last_parm_insn (cfun->x_last_parm_insn)
 588 #define context_display (cfun->x_context_display)
 589 #define trampoline_list (cfun->x_trampoline_list)
 590 #define function_call_count (cfun->x_function_call_count)
 591 #define temp_slots (cfun->x_temp_slots)
 592 #define temp_slot_level (cfun->x_temp_slot_level)
 593 #define target_temp_slot_level (cfun->x_target_temp_slot_level)
 594 #define var_temp_slot_level (cfun->x_var_temp_slot_level)
 595 #define nonlocal_labels (cfun->x_nonlocal_labels)
 596 #define nonlocal_goto_handler_slots (cfun->x_nonlocal_goto_handler_slots)
 597 #define nonlocal_goto_handler_labels (cfun->x_nonlocal_goto_handler_labels)
 598 #define nonlocal_goto_stack_level (cfun->x_nonlocal_goto_stack_level)
 599
 600 /* The FUNCTION_DECL for an inline function currently being expanded.  */
 601 extern tree inline_function_decl;
 602
 603 /* Given a function decl for a containing function,
 604    return the `struct function' for it.  */
 605 struct function *find_function_data (tree);
 606
 607 /* Set NOTE_BLOCK for each block note in the current function.  */
 608 extern void identify_blocks (void);
 609
 610 /* Identify BLOCKs referenced by more than one NOTE_INSN_BLOCK_{BEG,END},
 611    and create duplicate blocks.  */
 612 extern void reorder_blocks (void);
 613
 614 /* Set BLOCK_NUMBER for all the blocks in FN.  */
 615 extern void number_blocks (tree);
 616
 617 /* Return size needed for stack frame based on slots so far allocated.
 618    This size counts from zero.  It is not rounded to STACK_BOUNDARY;
 619    the caller may have to do that.  */
 620 extern HOST_WIDE_INT get_frame_size (void);
 621 /* Likewise, but for a different than the current function.  */
 622 extern HOST_WIDE_INT get_func_frame_size (struct function *);
 623
 624 /* A pointer to a function to create target specific, per-function
 625    data structures.  */
 626 extern struct machine_function * (*init_machine_status) (void);
 627
 628 /* Save and restore status information for a nested function.  */
 629 extern void restore_emit_status (struct function *);
 630 extern void free_after_parsing (struct function *);
 631 extern void free_after_compilation (struct function *);
 632
 633 extern void init_varasm_status (struct function *);
 634
 635 #ifdef RTX_CODE
 636 extern void diddle_return_value (void (*)(rtx, void*), void*);
 637 extern void clobber_return_register (void);
 638 extern void use_return_register (void);
 639 #endif
 640
 641 extern rtx get_arg_pointer_save_area (struct function *);
 642
 643 extern void init_virtual_regs (struct emit_status *);
 644
 645 /* Returns the name of the current function.  */
 646 extern const char *current_function_name (void);
 647
 648 /* Called once, at initialization, to initialize function.c.  */
 649 extern void init_function_once (void);
 650
 651 #endif  /* GCC_FUNCTION_H */