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