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 function.c.  */
 185
 186   /* Points to the FUNCTION_DECL of this function.  */
 187   tree decl;
 188
 189   /* Function containing this function, if any.  */
 190   struct function *outer;
 191
 192   /* Number of bytes of args popped by function being compiled on its return.
 193      Zero if no bytes are to be popped.
 194      May affect compilation of return insn or of function epilogue.  */
 195   int pops_args;
 196
 197   /* If function's args have a fixed size, this is that size, in bytes.
 198      Otherwise, it is -1.
 199      May affect compilation of return insn or of function epilogue.  */
 200   int args_size;
 201
 202   /* # bytes the prologue should push and pretend that the caller pushed them.
 203      The prologue must do this, but only if parms can be passed in
 204      registers.  */
 205   int pretend_args_size;
 206
 207   /* # of bytes of outgoing arguments.  If ACCUMULATE_OUTGOING_ARGS is
 208      defined, the needed space is pushed by the prologue.  */
 209   int outgoing_args_size;
 210
 211   /* This is the offset from the arg pointer to the place where the first
 212      anonymous arg can be found, if there is one.  */
 213   rtx arg_offset_rtx;
 214
 215   /* Quantities of various kinds of registers
 216      used for the current function's args.  */
 217   CUMULATIVE_ARGS args_info;
 218
 219   /* If nonzero, an RTL expression for the location at which the current
 220      function returns its result.  If the current function returns its
 221      result in a register, current_function_return_rtx will always be
 222      the hard register containing the result.  */
 223   rtx return_rtx;
 224
 225   /* The arg pointer hard register, or the pseudo into which it was copied.  */
 226   rtx internal_arg_pointer;
 227
 228   /* Language-specific reason why the current function cannot be made
 229      inline.  */
 230   const char *cannot_inline;
 231
 232   /* Opaque pointer used by get_hard_reg_initial_val and
 233      has_hard_reg_initial_val (see integrate.[hc]).  */
 234   struct initial_value_struct *hard_reg_initial_vals;
 235
 236   /* Number of function calls seen so far in current function.  */
 237   int x_function_call_count;
 238
 239   /* List (chain of TREE_LIST) of LABEL_DECLs for all nonlocal labels
 240      (labels to which there can be nonlocal gotos from nested functions)
 241      in this function.  */
 242   tree x_nonlocal_labels;
 243
 244   /* List (chain of EXPR_LIST) of stack slots that hold the current handlers
 245      for nonlocal gotos.  There is one for every nonlocal label in the
 246      function; this list matches the one in nonlocal_labels.
 247      Zero when function does not have nonlocal labels.  */
 248   rtx x_nonlocal_goto_handler_slots;
 249
 250   /* List (chain of EXPR_LIST) of labels heading the current handlers for
 251      nonlocal gotos.  */
 252   rtx x_nonlocal_goto_handler_labels;
 253
 254   /* RTX for stack slot that holds the stack pointer value to restore
 255      for a nonlocal goto.
 256      Zero when function does not have nonlocal labels.  */
 257   rtx x_nonlocal_goto_stack_level;
 258
 259   /* Label that will go on parm cleanup code, if any.
 260      Jumping to this label runs cleanup code for parameters, if
 261      such code must be run.  Following this code is the logical return
 262      label.  */
 263   rtx x_cleanup_label;
 264
 265   /* Label that will go on function epilogue.
 266      Jumping to this label serves as a "return" instruction
 267      on machines which require execution of the epilogue on all returns.  */
 268   rtx x_return_label;
 269
 270   /* Label that will go on the end of function epilogue.
 271      Jumping to this label serves as a "naked return" instruction
 272      on machines which require execution of the epilogue on all returns.  */
 273   rtx x_naked_return_label;
 274
 275   /* Label and register for unswitching computed gotos.  */
 276   rtx computed_goto_common_label;
 277   rtx computed_goto_common_reg;
 278
 279   /* List (chain of EXPR_LISTs) of pseudo-regs of SAVE_EXPRs.
 280      So we can mark them all live at the end of the function, if nonopt.  */
 281   rtx x_save_expr_regs;
 282
 283   /* List (chain of EXPR_LISTs) of all stack slots in this function.
 284      Made for the sake of unshare_all_rtl.  */
 285   rtx x_stack_slot_list;
 286
 287   /* Chain of all RTL_EXPRs that have insns in them.  */
 288   tree x_rtl_expr_chain;
 289
 290   /* Label to jump back to for tail recursion, or 0 if we have
 291      not yet needed one for this function.  */
 292   rtx x_tail_recursion_label;
 293
 294   /* Place after which to insert the tail_recursion_label if we need one.  */
 295   rtx x_tail_recursion_reentry;
 296
 297   /* Location at which to save the argument pointer if it will need to be
 298      referenced.  There are two cases where this is done: if nonlocal gotos
 299      exist, or if vars stored at an offset from the argument pointer will be
 300      needed by inner routines.  */
 301   rtx x_arg_pointer_save_area;
 302
 303   /* If the function returns non-void, we will emit a clobber of the
 304      return registers just in case the user fell off the end without
 305      returning a proper value.  This is that insn.  */
 306   rtx x_clobber_return_insn;
 307
 308   /* Offset to end of allocated area of stack frame.
 309      If stack grows down, this is the address of the last stack slot allocated.
 310      If stack grows up, this is the address for the next slot.  */
 311   HOST_WIDE_INT x_frame_offset;
 312
 313   /* List (chain of TREE_LISTs) of static chains for containing functions.
 314      Each link has a FUNCTION_DECL in the TREE_PURPOSE and a reg rtx
 315      in an RTL_EXPR in the TREE_VALUE.  */
 316   tree x_context_display;
 317
 318   /* List (chain of TREE_LISTs) of trampolines for nested functions.
 319      The trampoline sets up the static chain and jumps to the function.
 320      We supply the trampoline's address when the function's address is
 321      requested.
 322
 323      Each link has a FUNCTION_DECL in the TREE_PURPOSE and a reg rtx
 324      in an RTL_EXPR in the TREE_VALUE.  */
 325   tree x_trampoline_list;
 326
 327   /* Insn after which register parms and SAVE_EXPRs are born, if nonopt.  */
 328   rtx x_parm_birth_insn;
 329
 330   /* Last insn of those whose job was to put parms into their nominal
 331      homes.  */
 332   rtx x_last_parm_insn;
 333
 334   /* 1 + last pseudo register number possibly used for loading a copy
 335      of a parameter of this function.  */
 336   unsigned int x_max_parm_reg;
 337
 338   /* Vector indexed by REGNO, containing location on stack in which
 339      to put the parm which is nominally in pseudo register REGNO,
 340      if we discover that that parm must go in the stack.  The highest
 341      element in this vector is one less than MAX_PARM_REG, above.  */
 342   rtx * GTY ((length ("%h.x_max_parm_reg"))) x_parm_reg_stack_loc;
 343
 344   /* List of all temporaries allocated, both available and in use.  */
 345   struct temp_slot *x_temp_slots;
 346
 347   /* Current nesting level for temporaries.  */
 348   int x_temp_slot_level;
 349
 350   /* Current nesting level for variables in a block.  */
 351   int x_var_temp_slot_level;
 352
 353   /* When temporaries are created by TARGET_EXPRs, they are created at
 354      this level of temp_slot_level, so that they can remain allocated
 355      until no longer needed.  CLEANUP_POINT_EXPRs define the lifetime
 356      of TARGET_EXPRs.  */
 357   int x_target_temp_slot_level;
 358
 359   /* This slot is initialized as 0 and is added to
 360      during the nested function.  */
 361   struct var_refs_queue *fixup_var_refs_queue;
 362
 363   /* For integrate.c.  */
 364   int inlinable;
 365   int no_debugging_symbols;
 366   rtvec original_arg_vector;
 367   tree original_decl_initial;
 368   /* Last insn of those whose job was to put parms into their nominal
 369      homes.  */
 370   rtx inl_last_parm_insn;
 371   /* Highest label number in current function.  */
 372   int inl_max_label_num;
 373
 374   /* Function sequence number for profiling, debugging, etc.  */
 375   int funcdef_no;
 376
 377   /* For md files.  */
 378
 379   /* tm.h can use this to store whatever it likes.  */
 380   struct machine_function * GTY ((maybe_undef (""))) machine;
 381   /* The largest alignment of slot allocated on the stack.  */
 382   int stack_alignment_needed;
 383   /* Preferred alignment of the end of stack frame.  */
 384   int preferred_stack_boundary;
 385   /* Set when the call to function itself has been emit.  */
 386   bool recursive_call_emit;
 387
 388   /* Language-specific code can use this to store whatever it likes.  */
 389   struct language_function * language;
 390
 391   /* For reorg.  */
 392
 393   /* If some insns can be deferred to the delay slots of the epilogue, the
 394      delay list for them is recorded here.  */
 395   rtx epilogue_delay_list;
 396
 397   /* How commonly executed the function is.  Initialized during branch
 398      probabilities pass.  */
 399   enum function_frequency {
 400     /* This function most likely won't be executed at all.
 401        (set only when profile feedback is available).  */
 402     FUNCTION_FREQUENCY_UNLIKELY_EXECUTED,
 403     /* The default value.  */
 404     FUNCTION_FREQUENCY_NORMAL,
 405     /* Optimize this function hard
 406        (set only when profile feedback is available).  */
 407     FUNCTION_FREQUENCY_HOT
 408   } function_frequency;
 409
 410   /* Maximal number of entities in the single jumptable.  Used to estimate
 411      final flowgraph size.  */
 412   int max_jumptable_ents;
 413
 414   /* Collected bit flags.  */
 415
 416   /* Nonzero if function being compiled needs to be given an address
 417      where the value should be stored.  */
 418   unsigned int returns_struct : 1;
 419
 420   /* Nonzero if function being compiled needs to
 421      return the address of where it has put a structure value.  */
 422   unsigned int returns_pcc_struct : 1;
 423
 424   /* Nonzero if the current function returns a pointer type.  */
 425   unsigned int returns_pointer : 1;
 426
 427   /* Nonzero if function being compiled needs to be passed a static chain.  */
 428   unsigned int needs_context : 1;
 429
 430   /* Nonzero if function being compiled can call setjmp.  */
 431   unsigned int calls_setjmp : 1;
 432
 433   /* Nonzero if function being compiled can call longjmp.  */
 434   unsigned int calls_longjmp : 1;
 435
 436   /* Nonzero if function being compiled can call alloca,
 437      either as a subroutine or builtin.  */
 438   unsigned int calls_alloca : 1;
 439
 440   /* Nonzero if the function calls __builtin_eh_return.  */
 441   unsigned int calls_eh_return : 1;
 442
 443   /* Nonzero if the function calls __builtin_constant_p.  */
 444   unsigned int calls_constant_p : 1;
 445
 446   /* Nonzero if function being compiled receives nonlocal gotos
 447      from nested functions.  */
 448   unsigned int has_nonlocal_label : 1;
 449
 450   /* Nonzero if function being compiled has nonlocal gotos to parent
 451      function.  */
 452   unsigned int has_nonlocal_goto : 1;
 453
 454   /* Nonzero if function being compiled contains nested functions.  */
 455   unsigned int contains_functions : 1;
 456
 457   /* Nonzero if the function being compiled issues a computed jump.  */
 458   unsigned int has_computed_jump : 1;
 459
 460   /* Nonzero if the current function is a thunk, i.e., a lightweight
 461      function implemented by the output_mi_thunk hook) that just
 462      adjusts one of its arguments and forwards to another
 463      function.  */
 464   unsigned int is_thunk : 1;
 465
 466   /* This bit is used by the exception handling logic.  It is set if all
 467      calls (if any) are sibling calls.  Such functions do not have to
 468      have EH tables generated, as they cannot throw.  A call to such a
 469      function, however, should be treated as throwing if any of its callees
 470      can throw.  */
 471   unsigned int all_throwers_are_sibcalls : 1;
 472
 473   /* Nonzero if instrumentation calls for function entry and exit should be
 474      generated.  */
 475   unsigned int instrument_entry_exit : 1;
 476
 477   /* Nonzero if profiling code should be generated.  */
 478   unsigned int profile : 1;
 479
 480   /* Nonzero if stack limit checking should be enabled in the current
 481      function.  */
 482   unsigned int limit_stack : 1;
 483
 484   /* Nonzero if current function uses stdarg.h or equivalent.  */
 485   unsigned int stdarg : 1;
 486
 487   /* Nonzero if this function is being processed in function-at-a-time
 488      mode.  In other words, if all tree structure for this function,
 489      including the BLOCK tree, is created before RTL generation
 490      commences.  */
 491   unsigned int x_whole_function_mode_p : 1;
 492
 493   /* Nonzero if the back-end should not keep track of expressions that
 494      determine the size of variable-sized objects.  Normally, such
 495      expressions are saved away, and then expanded when the next
 496      function is started.  For example, if a parameter has a
 497      variable-sized type, then the size of the parameter is computed
 498      when the function body is entered.  However, some front-ends do
 499      not desire this behavior.  */
 500   unsigned int x_dont_save_pending_sizes_p : 1;
 501
 502   /* Nonzero if the current function uses the constant pool.  */
 503   unsigned int uses_const_pool : 1;
 504
 505   /* Nonzero if the current function uses pic_offset_table_rtx.  */
 506   unsigned int uses_pic_offset_table : 1;
 507
 508   /* Nonzero if the current function needs an lsda for exception handling.  */
 509   unsigned int uses_eh_lsda : 1;
 510
 511   /* Nonzero if code to initialize arg_pointer_save_area has been emitted.  */
 512   unsigned int arg_pointer_save_area_init : 1;
 513
 514   /* Flag for use by ther rtl inliner, to tell if the function has been
 515      processed at least once.  */
 516   unsigned int rtl_inline_init : 1;
 517
 518   /* Nonzero if the rtl inliner has saved the function for inlining.  */
 519   unsigned int saved_for_inline : 1;
 520 };
 521
 522 /* The function currently being compiled.  */
 523 extern GTY(()) struct function *cfun;
 524
 525 /* Pointer to chain of `struct function' for containing functions.  */
 526 extern GTY(()) struct function *outer_function_chain;
 527
 528 /* Nonzero if we've already converted virtual regs to hard regs.  */
 529 extern int virtuals_instantiated;
 530
 531 /* Nonzero if at least one trampoline has been created.  */
 532 extern int trampolines_created;
 533
 534 /* For backward compatibility... eventually these should all go away.  */
 535 #define current_function_pops_args (cfun->pops_args)
 536 #define current_function_returns_struct (cfun->returns_struct)
 537 #define current_function_returns_pcc_struct (cfun->returns_pcc_struct)
 538 #define current_function_returns_pointer (cfun->returns_pointer)
 539 #define current_function_needs_context (cfun->needs_context)
 540 #define current_function_calls_setjmp (cfun->calls_setjmp)
 541 #define current_function_calls_alloca (cfun->calls_alloca)
 542 #define current_function_calls_longjmp (cfun->calls_longjmp)
 543 #define current_function_calls_eh_return (cfun->calls_eh_return)
 544 #define current_function_calls_constant_p (cfun->calls_constant_p)
 545 #define current_function_has_computed_jump (cfun->has_computed_jump)
 546 #define current_function_contains_functions (cfun->contains_functions)
 547 #define current_function_is_thunk (cfun->is_thunk)
 548 #define current_function_args_info (cfun->args_info)
 549 #define current_function_args_size (cfun->args_size)
 550 #define current_function_pretend_args_size (cfun->pretend_args_size)
 551 #define current_function_outgoing_args_size (cfun->outgoing_args_size)
 552 #define current_function_arg_offset_rtx (cfun->arg_offset_rtx)
 553 #define current_function_stdarg (cfun->stdarg)
 554 #define current_function_internal_arg_pointer (cfun->internal_arg_pointer)
 555 #define current_function_return_rtx (cfun->return_rtx)
 556 #define current_function_instrument_entry_exit (cfun->instrument_entry_exit)
 557 #define current_function_profile (cfun->profile)
 558 #define current_function_funcdef_no (cfun->funcdef_no)
 559 #define current_function_limit_stack (cfun->limit_stack)
 560 #define current_function_uses_pic_offset_table (cfun->uses_pic_offset_table)
 561 #define current_function_uses_const_pool (cfun->uses_const_pool)
 562 #define current_function_cannot_inline (cfun->cannot_inline)
 563 #define current_function_epilogue_delay_list (cfun->epilogue_delay_list)
 564 #define current_function_has_nonlocal_label (cfun->has_nonlocal_label)
 565 #define current_function_has_nonlocal_goto (cfun->has_nonlocal_goto)
 566
 567 #define max_parm_reg (cfun->x_max_parm_reg)
 568 #define parm_reg_stack_loc (cfun->x_parm_reg_stack_loc)
 569 #define cleanup_label (cfun->x_cleanup_label)
 570 #define return_label (cfun->x_return_label)
 571 #define naked_return_label (cfun->x_naked_return_label)
 572 #define save_expr_regs (cfun->x_save_expr_regs)
 573 #define stack_slot_list (cfun->x_stack_slot_list)
 574 #define parm_birth_insn (cfun->x_parm_birth_insn)
 575 #define frame_offset (cfun->x_frame_offset)
 576 #define tail_recursion_label (cfun->x_tail_recursion_label)
 577 #define tail_recursion_reentry (cfun->x_tail_recursion_reentry)
 578 #define arg_pointer_save_area (cfun->x_arg_pointer_save_area)
 579 #define rtl_expr_chain (cfun->x_rtl_expr_chain)
 580 #define last_parm_insn (cfun->x_last_parm_insn)
 581 #define context_display (cfun->x_context_display)
 582 #define trampoline_list (cfun->x_trampoline_list)
 583 #define function_call_count (cfun->x_function_call_count)
 584 #define temp_slots (cfun->x_temp_slots)
 585 #define temp_slot_level (cfun->x_temp_slot_level)
 586 #define target_temp_slot_level (cfun->x_target_temp_slot_level)
 587 #define var_temp_slot_level (cfun->x_var_temp_slot_level)
 588 #define nonlocal_labels (cfun->x_nonlocal_labels)
 589 #define nonlocal_goto_handler_slots (cfun->x_nonlocal_goto_handler_slots)
 590 #define nonlocal_goto_handler_labels (cfun->x_nonlocal_goto_handler_labels)
 591 #define nonlocal_goto_stack_level (cfun->x_nonlocal_goto_stack_level)
 592
 593 /* The FUNCTION_DECL for an inline function currently being expanded.  */
 594 extern tree inline_function_decl;
 595
 596 /* Given a function decl for a containing function,
 597    return the `struct function' for it.  */
 598 struct function *find_function_data (tree);
 599
 600 /* Set NOTE_BLOCK for each block note in the current function.  */
 601 extern void identify_blocks (void);
 602
 603 /* Identify BLOCKs referenced by more than one NOTE_INSN_BLOCK_{BEG,END},
 604    and create duplicate blocks.  */
 605 extern void reorder_blocks (void);
 606
 607 /* Set BLOCK_NUMBER for all the blocks in FN.  */
 608 extern void number_blocks (tree);
 609
 610 /* Return size needed for stack frame based on slots so far allocated.
 611    This size counts from zero.  It is not rounded to STACK_BOUNDARY;
 612    the caller may have to do that.  */
 613 extern HOST_WIDE_INT get_frame_size (void);
 614 /* Likewise, but for a different than the current function.  */
 615 extern HOST_WIDE_INT get_func_frame_size (struct function *);
 616
 617 /* A pointer to a function to create target specific, per-function
 618    data structures.  */
 619 extern struct machine_function * (*init_machine_status) (void);
 620
 621 /* Save and restore status information for a nested function.  */
 622 extern void restore_emit_status (struct function *);
 623 extern void free_after_parsing (struct function *);
 624 extern void free_after_compilation (struct function *);
 625
 626 extern void init_varasm_status (struct function *);
 627
 628 #ifdef RTX_CODE
 629 extern void diddle_return_value (void (*)(rtx, void*), void*);
 630 extern void clobber_return_register (void);
 631 extern void use_return_register (void);
 632 #endif
 633
 634 extern rtx get_arg_pointer_save_area (struct function *);
 635
 636 extern void init_virtual_regs (struct emit_status *);
 637
 638 /* Returns the name of the current function.  */
 639 extern const char *current_function_name (void);
 640
 641 /* Called once, at initialization, to initialize function.c.  */
 642 extern void init_function_once (void);
 643
 644 #endif  /* GCC_FUNCTION_H */