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