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, 2005, 2006, 2007, 2008, 2009
   4    Free Software Foundation, Inc.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #ifndef GCC_FUNCTION_H
  23 #define GCC_FUNCTION_H
  24
  25 #include "tree.h"
  26 #include "hashtab.h"
  27 #include "vecprim.h"
  28 #include "tm.h"         /* For CUMULATIVE_ARGS.  */
  29 #include "hard-reg-set.h"
  30
  31 /* Stack of pending (incomplete) sequences saved by `start_sequence'.
  32    Each element describes one pending sequence.
  33    The main insn-chain is saved in the last element of the chain,
  34    unless the chain is empty.  */
  35
  36 struct GTY(()) sequence_stack {
  37   /* First and last insns in the chain of the saved sequence.  */
  38   rtx first;
  39   rtx last;
  40   struct sequence_stack *next;
  41 };
  42 \f
  43 struct GTY(()) emit_status {
  44   /* This is reset to LAST_VIRTUAL_REGISTER + 1 at the start of each function.
  45      After rtl generation, it is 1 plus the largest register number used.  */
  46   int x_reg_rtx_no;
  47
  48   /* Lowest label number in current function.  */
  49   int x_first_label_num;
  50
  51   /* The ends of the doubly-linked chain of rtl for the current function.
  52      Both are reset to null at the start of rtl generation for the function.
  53
  54      start_sequence saves both of these on `sequence_stack' and then starts
  55      a new, nested sequence of insns.  */
  56   rtx x_first_insn;
  57   rtx x_last_insn;
  58
  59   /* Stack of pending (incomplete) sequences saved by `start_sequence'.
  60      Each element describes one pending sequence.
  61      The main insn-chain is saved in the last element of the chain,
  62      unless the chain is empty.  */
  63   struct sequence_stack *sequence_stack;
  64
  65   /* INSN_UID for next insn emitted.
  66      Reset to 1 for each function compiled.  */
  67   int x_cur_insn_uid;
  68
  69   /* INSN_UID for next debug insn emitted.  Only used if
  70      --param min-nondebug-insn-uid=<value> is given with nonzero value.  */
  71   int x_cur_debug_insn_uid;
  72
  73   /* Location the last line-number NOTE emitted.
  74      This is used to avoid generating duplicates.  */
  75   location_t x_last_location;
  76
  77   /* The length of the regno_pointer_align, regno_decl, and x_regno_reg_rtx
  78      vectors.  Since these vectors are needed during the expansion phase when
  79      the total number of registers in the function is not yet known, the
  80      vectors are copied and made bigger when necessary.  */
  81   int regno_pointer_align_length;
  82
  83   /* Indexed by pseudo register number, if nonzero gives the known alignment
  84      for that pseudo (if REG_POINTER is set in x_regno_reg_rtx).
  85      Allocated in parallel with x_regno_reg_rtx.  */
  86   unsigned char * GTY((skip)) regno_pointer_align;
  87 };
  88
  89
  90 /* Indexed by pseudo register number, gives the rtx for that pseudo.
  91    Allocated in parallel with regno_pointer_align.
  92    FIXME: We could put it into emit_status struct, but gengtype is not able to deal
  93    with length attribute nested in top level structures.  */
  94
  95 extern GTY ((length ("crtl->emit.x_reg_rtx_no"))) rtx * regno_reg_rtx;
  96
  97 /* For backward compatibility... eventually these should all go away.  */
  98 #define reg_rtx_no (crtl->emit.x_reg_rtx_no)
  99 #define seq_stack (crtl->emit.sequence_stack)
 100
 101 #define REGNO_POINTER_ALIGN(REGNO) (crtl->emit.regno_pointer_align[REGNO])
 102
 103 struct GTY(()) expr_status {
 104   /* Number of units that we should eventually pop off the stack.
 105      These are the arguments to function calls that have already returned.  */
 106   int x_pending_stack_adjust;
 107
 108   /* Under some ABIs, it is the caller's responsibility to pop arguments
 109      pushed for function calls.  A naive implementation would simply pop
 110      the arguments immediately after each call.  However, if several
 111      function calls are made in a row, it is typically cheaper to pop
 112      all the arguments after all of the calls are complete since a
 113      single pop instruction can be used.  Therefore, GCC attempts to
 114      defer popping the arguments until absolutely necessary.  (For
 115      example, at the end of a conditional, the arguments must be popped,
 116      since code outside the conditional won't know whether or not the
 117      arguments need to be popped.)
 118
 119      When INHIBIT_DEFER_POP is nonzero, however, the compiler does not
 120      attempt to defer pops.  Instead, the stack is popped immediately
 121      after each call.  Rather then setting this variable directly, use
 122      NO_DEFER_POP and OK_DEFER_POP.  */
 123   int x_inhibit_defer_pop;
 124
 125   /* If PREFERRED_STACK_BOUNDARY and PUSH_ROUNDING are defined, the stack
 126      boundary can be momentarily unaligned while pushing the arguments.
 127      Record the delta since last aligned boundary here in order to get
 128      stack alignment in the nested function calls working right.  */
 129   int x_stack_pointer_delta;
 130
 131   /* Nonzero means __builtin_saveregs has already been done in this function.
 132      The value is the pseudoreg containing the value __builtin_saveregs
 133      returned.  */
 134   rtx x_saveregs_value;
 135
 136   /* Similarly for __builtin_apply_args.  */
 137   rtx x_apply_args_value;
 138
 139   /* List of labels that must never be deleted.  */
 140   rtx x_forced_labels;
 141 };
 142
 143 typedef struct call_site_record_d *call_site_record;
 144 DEF_VEC_P(call_site_record);
 145 DEF_VEC_ALLOC_P(call_site_record, gc);
 146
 147 /* RTL representation of exception handling.  */
 148 struct GTY(()) rtl_eh {
 149   rtx ehr_stackadj;
 150   rtx ehr_handler;
 151   rtx ehr_label;
 152
 153   rtx sjlj_fc;
 154   rtx sjlj_exit_after;
 155
 156   VEC(uchar,gc) *action_record_data;
 157
 158   VEC(call_site_record,gc) *call_site_record[2];
 159 };
 160
 161 #define pending_stack_adjust (crtl->expr.x_pending_stack_adjust)
 162 #define inhibit_defer_pop (crtl->expr.x_inhibit_defer_pop)
 163 #define saveregs_value (crtl->expr.x_saveregs_value)
 164 #define apply_args_value (crtl->expr.x_apply_args_value)
 165 #define forced_labels (crtl->expr.x_forced_labels)
 166 #define stack_pointer_delta (crtl->expr.x_stack_pointer_delta)
 167
 168 struct gimple_df;
 169 struct temp_slot;
 170 typedef struct temp_slot *temp_slot_p;
 171 struct call_site_record_d;
 172
 173 DEF_VEC_P(temp_slot_p);
 174 DEF_VEC_ALLOC_P(temp_slot_p,gc);
 175 struct ipa_opt_pass_d;
 176 typedef struct ipa_opt_pass_d *ipa_opt_pass;
 177
 178 DEF_VEC_P(ipa_opt_pass);
 179 DEF_VEC_ALLOC_P(ipa_opt_pass,heap);
 180
 181 struct GTY(()) varasm_status {
 182   /* If we're using a per-function constant pool, this is it.  */
 183   struct rtx_constant_pool *pool;
 184
 185   /* Number of tree-constants deferred during the expansion of this
 186      function.  */
 187   unsigned int deferred_constants;
 188 };
 189
 190 /* Information mainlined about RTL representation of incoming arguments.  */
 191 struct GTY(()) incoming_args {
 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 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   /* This is the offset from the arg pointer to the place where the first
 208      anonymous arg can be found, if there is one.  */
 209   rtx arg_offset_rtx;
 210
 211   /* Quantities of various kinds of registers
 212      used for the current function's args.  */
 213   CUMULATIVE_ARGS info;
 214
 215   /* The arg pointer hard register, or the pseudo into which it was copied.  */
 216   rtx internal_arg_pointer;
 217 };
 218
 219 /* Data for function partitioning.  */
 220 struct GTY(()) function_subsections {
 221   /* Assembly labels for the hot and cold text sections, to
 222      be used by debugger functions for determining the size of text
 223      sections.  */
 224
 225   const char *hot_section_label;
 226   const char *cold_section_label;
 227   const char *hot_section_end_label;
 228   const char *cold_section_end_label;
 229
 230   /* String to be used for name of cold text sections, via
 231      targetm.asm_out.named_section.  */
 232
 233   const char *unlikely_text_section_name;
 234 };
 235
 236 /* Describe an empty area of space in the stack frame.  These can be chained
 237    into a list; this is used to keep track of space wasted for alignment
 238    reasons.  */
 239 struct GTY(()) frame_space
 240 {
 241   struct frame_space *next;
 242
 243   HOST_WIDE_INT start;
 244   HOST_WIDE_INT length;
 245 };
 246
 247 /* Datastructures maintained for currently processed function in RTL form.  */
 248 struct GTY(()) rtl_data {
 249   struct expr_status expr;
 250   struct emit_status emit;
 251   struct varasm_status varasm;
 252   struct incoming_args args;
 253   struct function_subsections subsections;
 254   struct rtl_eh eh;
 255
 256   /* For function.c  */
 257
 258   /* # of bytes of outgoing arguments.  If ACCUMULATE_OUTGOING_ARGS is
 259      defined, the needed space is pushed by the prologue.  */
 260   int outgoing_args_size;
 261
 262   /* If nonzero, an RTL expression for the location at which the current
 263      function returns its result.  If the current function returns its
 264      result in a register, current_function_return_rtx will always be
 265      the hard register containing the result.  */
 266   rtx return_rtx;
 267
 268   /* Opaque pointer used by get_hard_reg_initial_val and
 269      has_hard_reg_initial_val (see integrate.[hc]).  */
 270   struct initial_value_struct *hard_reg_initial_vals;
 271
 272   /* A variable living at the top of the frame that holds a known value.
 273      Used for detecting stack clobbers.  */
 274   tree stack_protect_guard;
 275
 276   /* List (chain of EXPR_LIST) of labels heading the current handlers for
 277      nonlocal gotos.  */
 278   rtx x_nonlocal_goto_handler_labels;
 279
 280   /* Label that will go on function epilogue.
 281      Jumping to this label serves as a "return" instruction
 282      on machines which require execution of the epilogue on all returns.  */
 283   rtx x_return_label;
 284
 285   /* Label that will go on the end of function epilogue.
 286      Jumping to this label serves as a "naked return" instruction
 287      on machines which require execution of the epilogue on all returns.  */
 288   rtx x_naked_return_label;
 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   /* List of empty areas in the stack frame.  */
 295   struct frame_space *frame_space_list;
 296
 297   /* Place after which to insert the tail_recursion_label if we need one.  */
 298   rtx x_stack_check_probe_note;
 299
 300   /* Location at which to save the argument pointer if it will need to be
 301      referenced.  There are two cases where this is done: if nonlocal gotos
 302      exist, or if vars stored at an offset from the argument pointer will be
 303      needed by inner routines.  */
 304   rtx x_arg_pointer_save_area;
 305
 306   /* Dynamic Realign Argument Pointer used for realigning stack.  */
 307   rtx drap_reg;
 308
 309   /* Offset to end of allocated area of stack frame.
 310      If stack grows down, this is the address of the last stack slot allocated.
 311      If stack grows up, this is the address for the next slot.  */
 312   HOST_WIDE_INT x_frame_offset;
 313
 314   /* Insn after which register parms and SAVE_EXPRs are born, if nonopt.  */
 315   rtx x_parm_birth_insn;
 316
 317   /* List of all used temporaries allocated, by level.  */
 318   VEC(temp_slot_p,gc) *x_used_temp_slots;
 319
 320   /* List of available temp slots.  */
 321   struct temp_slot *x_avail_temp_slots;
 322
 323   /* Current nesting level for temporaries.  */
 324   int x_temp_slot_level;
 325
 326   /* The largest alignment needed on the stack, including requirement
 327      for outgoing stack alignment.  */
 328   unsigned int stack_alignment_needed;
 329
 330   /* Preferred alignment of the end of stack frame, which is preferred
 331      to call other functions.  */
 332   unsigned int preferred_stack_boundary;
 333
 334   /* The minimum alignment of parameter stack.  */
 335   unsigned int parm_stack_boundary;
 336
 337   /* The largest alignment of slot allocated on the stack.  */
 338   unsigned int max_used_stack_slot_alignment;
 339
 340   /* The stack alignment estimated before reload, with consideration of
 341      following factors:
 342      1. Alignment of local stack variables (max_used_stack_slot_alignment)
 343      2. Alignment requirement to call other functions
 344         (preferred_stack_boundary)
 345      3. Alignment of non-local stack variables but might be spilled in
 346         local stack.  */
 347   unsigned int stack_alignment_estimated;
 348
 349   /* For reorg.  */
 350
 351   /* If some insns can be deferred to the delay slots of the epilogue, the
 352      delay list for them is recorded here.  */
 353   rtx epilogue_delay_list;
 354
 355   /* Nonzero if function being compiled called builtin_return_addr or
 356      builtin_frame_address with nonzero count.  */
 357   bool accesses_prior_frames;
 358
 359   /* Nonzero if the function calls __builtin_eh_return.  */
 360   bool calls_eh_return;
 361
 362   /* Nonzero if function saves all registers, e.g. if it has a nonlocal
 363      label that can reach the exit block via non-exceptional paths. */
 364   bool saves_all_registers;
 365
 366   /* Nonzero if function being compiled has nonlocal gotos to parent
 367      function.  */
 368   bool has_nonlocal_goto;
 369
 370   /* Nonzero if function being compiled has an asm statement.  */
 371   bool has_asm_statement;
 372
 373   /* This bit is used by the exception handling logic.  It is set if all
 374      calls (if any) are sibling calls.  Such functions do not have to
 375      have EH tables generated, as they cannot throw.  A call to such a
 376      function, however, should be treated as throwing if any of its callees
 377      can throw.  */
 378   bool all_throwers_are_sibcalls;
 379
 380   /* Nonzero if stack limit checking should be enabled in the current
 381      function.  */
 382   bool limit_stack;
 383
 384   /* Nonzero if profiling code should be generated.  */
 385   bool profile;
 386
 387   /* Nonzero if the current function uses the constant pool.  */
 388   bool uses_const_pool;
 389
 390   /* Nonzero if the current function uses pic_offset_table_rtx.  */
 391   bool uses_pic_offset_table;
 392
 393   /* Nonzero if the current function needs an lsda for exception handling.  */
 394   bool uses_eh_lsda;
 395
 396   /* Set when the tail call has been produced.  */
 397   bool tail_call_emit;
 398
 399   /* Nonzero if code to initialize arg_pointer_save_area has been emitted.  */
 400   bool arg_pointer_save_area_init;
 401
 402   /* Nonzero if current function must be given a frame pointer.
 403      Set in global.c if anything is allocated on the stack there.  */
 404   bool frame_pointer_needed;
 405
 406   /* When set, expand should optimize for speed.  */
 407   bool maybe_hot_insn_p;
 408
 409   /* Nonzero if function stack realignment is needed.  This flag may be
 410      set twice: before and after reload.  It is set before reload wrt
 411      stack alignment estimation before reload.  It will be changed after
 412      reload if by then criteria of stack realignment is different.
 413      The value set after reload is the accurate one and is finalized.  */
 414   bool stack_realign_needed;
 415
 416   /* Nonzero if function stack realignment is tried.  This flag is set
 417      only once before reload.  It affects register elimination.  This
 418      is used to generate DWARF debug info for stack variables.  */
 419   bool stack_realign_tried;
 420
 421   /* Nonzero if function being compiled needs dynamic realigned
 422      argument pointer (drap) if stack needs realigning.  */
 423   bool need_drap;
 424
 425   /* Nonzero if function stack realignment estimation is done, namely
 426      stack_realign_needed flag has been set before reload wrt estimated
 427      stack alignment info.  */
 428   bool stack_realign_processed;
 429
 430   /* Nonzero if function stack realignment has been finalized, namely
 431      stack_realign_needed flag has been set and finalized after reload.  */
 432   bool stack_realign_finalized;
 433
 434   /* True if dbr_schedule has already been called for this function.  */
 435   bool dbr_scheduled_p;
 436
 437   /* True if current function can not throw.  Unlike
 438      TREE_NOTHROW (current_function_decl) it is set even for overwritable
 439      function where currently compiled version of it is nothrow.  */
 440   bool nothrow;
 441
 442   /* Like regs_ever_live, but 1 if a reg is set or clobbered from an
 443      asm.  Unlike regs_ever_live, elements of this array corresponding
 444      to eliminable regs (like the frame pointer) are set if an asm
 445      sets them.  */
 446   HARD_REG_SET asm_clobbers;
 447 };
 448
 449 #define return_label (crtl->x_return_label)
 450 #define naked_return_label (crtl->x_naked_return_label)
 451 #define stack_slot_list (crtl->x_stack_slot_list)
 452 #define parm_birth_insn (crtl->x_parm_birth_insn)
 453 #define frame_offset (crtl->x_frame_offset)
 454 #define stack_check_probe_note (crtl->x_stack_check_probe_note)
 455 #define arg_pointer_save_area (crtl->x_arg_pointer_save_area)
 456 #define used_temp_slots (crtl->x_used_temp_slots)
 457 #define avail_temp_slots (crtl->x_avail_temp_slots)
 458 #define temp_slot_level (crtl->x_temp_slot_level)
 459 #define nonlocal_goto_handler_labels (crtl->x_nonlocal_goto_handler_labels)
 460 #define frame_pointer_needed (crtl->frame_pointer_needed)
 461 #define stack_realign_fp (crtl->stack_realign_needed && !crtl->need_drap)
 462 #define stack_realign_drap (crtl->stack_realign_needed && crtl->need_drap)
 463
 464 extern GTY(()) struct rtl_data x_rtl;
 465
 466 /* Accessor to RTL datastructures.  We keep them statically allocated now since
 467    we never keep multiple functions.  For threaded compiler we might however
 468    want to do differently.  */
 469 #define crtl (&x_rtl)
 470
 471 /* This structure can save all the important global and static variables
 472    describing the status of the current function.  */
 473
 474 struct GTY(()) function {
 475   struct eh_status *eh;
 476
 477   /* The control flow graph for this function.  */
 478   struct control_flow_graph *cfg;
 479
 480   /* GIMPLE body for this function.  */
 481   struct gimple_seq_d *gimple_body;
 482
 483   /* SSA and dataflow information.  */
 484   struct gimple_df *gimple_df;
 485
 486   /* The loops in this function.  */
 487   struct loops *x_current_loops;
 488
 489   /* Value histograms attached to particular statements.  */
 490   htab_t GTY((skip)) value_histograms;
 491
 492   /* For function.c.  */
 493
 494   /* Points to the FUNCTION_DECL of this function.  */
 495   tree decl;
 496
 497   /* A PARM_DECL that should contain the static chain for this function.
 498      It will be initialized at the beginning of the function.  */
 499   tree static_chain_decl;
 500
 501   /* An expression that contains the non-local goto save area.  The first
 502      word is the saved frame pointer and the second is the saved stack
 503      pointer.  */
 504   tree nonlocal_goto_save_area;
 505
 506   /* Vector of function local variables, functions, types and constants.  */
 507   VEC(tree,gc) *local_decls;
 508
 509   /* For md files.  */
 510
 511   /* tm.h can use this to store whatever it likes.  */
 512   struct machine_function * GTY ((maybe_undef)) machine;
 513
 514   /* Language-specific code can use this to store whatever it likes.  */
 515   struct language_function * language;
 516
 517   /* Used types hash table.  */
 518   htab_t GTY ((param_is (union tree_node))) used_types_hash;
 519
 520   /* Last statement uid.  */
 521   int last_stmt_uid;
 522
 523   /* Function sequence number for profiling, debugging, etc.  */
 524   int funcdef_no;
 525
 526   /* Line number of the start of the function for debugging purposes.  */
 527   location_t function_start_locus;
 528
 529   /* Line number of the end of the function.  */
 530   location_t function_end_locus;
 531
 532   /* Properties used by the pass manager.  */
 533   unsigned int curr_properties;
 534   unsigned int last_verified;
 535
 536   /* Non-null if the function does something that would prevent it from
 537      being copied; this applies to both versioning and inlining.  Set to
 538      a string describing the reason for failure.  */
 539   const char * GTY((skip)) cannot_be_copied_reason;
 540
 541   /* Collected bit flags.  */
 542
 543   /* Number of units of general registers that need saving in stdarg
 544      function.  What unit is depends on the backend, either it is number
 545      of bytes, or it can be number of registers.  */
 546   unsigned int va_list_gpr_size : 8;
 547
 548   /* Number of units of floating point registers that need saving in stdarg
 549      function.  */
 550   unsigned int va_list_fpr_size : 8;
 551
 552   /* Nonzero if function being compiled can call setjmp.  */
 553   unsigned int calls_setjmp : 1;
 554
 555   /* Nonzero if function being compiled can call alloca,
 556      either as a subroutine or builtin.  */
 557   unsigned int calls_alloca : 1;
 558
 559   /* Nonzero if function being compiled receives nonlocal gotos
 560      from nested functions.  */
 561   unsigned int has_nonlocal_label : 1;
 562
 563   /* Nonzero if we've set cannot_be_copied_reason.  I.e. if
 564      (cannot_be_copied_set && !cannot_be_copied_reason), the function
 565      can in fact be copied.  */
 566   unsigned int cannot_be_copied_set : 1;
 567
 568   /* Nonzero if current function uses stdarg.h or equivalent.  */
 569   unsigned int stdarg : 1;
 570
 571   /* Nonzero if the back-end should not keep track of expressions that
 572      determine the size of variable-sized objects.  Normally, such
 573      expressions are saved away, and then expanded when the next
 574      function is started.  For example, if a parameter has a
 575      variable-sized type, then the size of the parameter is computed
 576      when the function body is entered.  However, some front-ends do
 577      not desire this behavior.  */
 578   unsigned int dont_save_pending_sizes_p : 1;
 579
 580   unsigned int after_inlining : 1;
 581   unsigned int always_inline_functions_inlined : 1;
 582
 583   /* Nonzero if function being compiled can throw synchronous non-call
 584      exceptions.  */
 585   unsigned int can_throw_non_call_exceptions : 1;
 586
 587   /* Fields below this point are not set for abstract functions; see
 588      allocate_struct_function.  */
 589
 590   /* Nonzero if function being compiled needs to be given an address
 591      where the value should be stored.  */
 592   unsigned int returns_struct : 1;
 593
 594   /* Nonzero if function being compiled needs to
 595      return the address of where it has put a structure value.  */
 596   unsigned int returns_pcc_struct : 1;
 597
 598   /* Nonzero if pass_tree_profile was run on this function.  */
 599   unsigned int after_tree_profile : 1;
 600
 601   /* Nonzero if this function has local DECL_HARD_REGISTER variables.
 602      In this case code motion has to be done more carefully.  */
 603   unsigned int has_local_explicit_reg_vars : 1;
 604
 605   /* Nonzero if the current function is a thunk, i.e., a lightweight
 606      function implemented by the output_mi_thunk hook) that just
 607      adjusts one of its arguments and forwards to another
 608      function.  */
 609   unsigned int is_thunk : 1;
 610 };
 611
 612 /* Add the decl D to the local_decls list of FUN.  */
 613
 614 static inline void
 615 add_local_decl (struct function *fun, tree d)
 616 {
 617   VEC_safe_push (tree, gc, fun->local_decls, d);
 618 }
 619
 620 #define FOR_EACH_LOCAL_DECL(FUN, I, D)          \
 621   FOR_EACH_VEC_ELT_REVERSE (tree, (FUN)->local_decls, I, D)
 622
 623 /* If va_list_[gf]pr_size is set to this, it means we don't know how
 624    many units need to be saved.  */
 625 #define VA_LIST_MAX_GPR_SIZE    255
 626 #define VA_LIST_MAX_FPR_SIZE    255
 627
 628 /* The function currently being compiled.  */
 629 extern GTY(()) struct function *cfun;
 630
 631 /* In order to ensure that cfun is not set directly, we redefine it so
 632    that it is not an lvalue.  Rather than assign to cfun, use
 633    push_cfun or set_cfun.  */
 634 #define cfun (cfun + 0)
 635
 636 /* Nonzero if we've already converted virtual regs to hard regs.  */
 637 extern int virtuals_instantiated;
 638
 639 /* Nonzero if at least one trampoline has been created.  */
 640 extern int trampolines_created;
 641
 642 struct GTY(()) types_used_by_vars_entry {
 643   tree type;
 644   tree var_decl;
 645 };
 646
 647 /* Hash table making the relationship between a global variable
 648    and the types it references in its initializer. The key of the
 649    entry is a referenced type, and the value is the DECL of the global
 650    variable. types_use_by_vars_do_hash and types_used_by_vars_eq below are
 651    the hash and equality functions to use for this hash table.  */
 652 extern GTY((param_is (struct types_used_by_vars_entry))) htab_t
 653   types_used_by_vars_hash;
 654
 655 hashval_t types_used_by_vars_do_hash (const void*);
 656 int types_used_by_vars_eq (const void *, const void *);
 657 void types_used_by_var_decl_insert (tree type, tree var_decl);
 658
 659 /* During parsing of a global variable, this vector contains the types
 660    referenced by the global variable.  */
 661 extern GTY(()) VEC(tree,gc) *types_used_by_cur_var_decl;
 662
 663
 664 /* cfun shouldn't be set directly; use one of these functions instead.  */
 665 extern void set_cfun (struct function *new_cfun);
 666 extern void push_cfun (struct function *new_cfun);
 667 extern void pop_cfun (void);
 668 extern void instantiate_decl_rtl (rtx x);
 669
 670 /* For backward compatibility... eventually these should all go away.  */
 671 #define current_function_funcdef_no (cfun->funcdef_no)
 672
 673 #define current_loops (cfun->x_current_loops)
 674 #define dom_computed (cfun->cfg->x_dom_computed)
 675 #define n_bbs_in_dom_tree (cfun->cfg->x_n_bbs_in_dom_tree)
 676 #define VALUE_HISTOGRAMS(fun) (fun)->value_histograms
 677
 678 /* Identify BLOCKs referenced by more than one NOTE_INSN_BLOCK_{BEG,END},
 679    and create duplicate blocks.  */
 680 extern void reorder_blocks (void);
 681
 682 /* Set BLOCK_NUMBER for all the blocks in FN.  */
 683 extern void number_blocks (tree);
 684
 685 extern void clear_block_marks (tree);
 686 extern tree blocks_nreverse (tree);
 687
 688 /* Return size needed for stack frame based on slots so far allocated.
 689    This size counts from zero.  It is not rounded to STACK_BOUNDARY;
 690    the caller may have to do that.  */
 691 extern HOST_WIDE_INT get_frame_size (void);
 692
 693 /* Issue an error message and return TRUE if frame OFFSET overflows in
 694    the signed target pointer arithmetics for function FUNC.  Otherwise
 695    return FALSE.  */
 696 extern bool frame_offset_overflow (HOST_WIDE_INT, tree);
 697
 698 /* A pointer to a function to create target specific, per-function
 699    data structures.  */
 700 extern struct machine_function * (*init_machine_status) (void);
 701
 702 /* Save and restore status information for a nested function.  */
 703 extern void free_after_parsing (struct function *);
 704 extern void free_after_compilation (struct function *);
 705
 706 extern void init_varasm_status (void);
 707
 708 #ifdef RTX_CODE
 709 extern void diddle_return_value (void (*)(rtx, void*), void*);
 710 extern void clobber_return_register (void);
 711 #endif
 712
 713 extern rtx get_arg_pointer_save_area (void);
 714
 715 /* Returns the name of the current function.  */
 716 extern const char *current_function_name (void);
 717
 718 extern void do_warn_unused_parameter (tree);
 719
 720 extern bool pass_by_reference (CUMULATIVE_ARGS *, enum machine_mode,
 721                                tree, bool);
 722 extern bool reference_callee_copied (CUMULATIVE_ARGS *, enum machine_mode,
 723                                      tree, bool);
 724
 725 extern void used_types_insert (tree);
 726
 727 extern int get_next_funcdef_no (void);
 728
 729 /* In predict.c */
 730 extern bool optimize_function_for_size_p (struct function *);
 731 extern bool optimize_function_for_speed_p (struct function *);
 732
 733 #endif  /* GCC_FUNCTION_H */