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1 684 jeremybenn
/* 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, 2010, 2011
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
 
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 register number, gives an rtx for that register (and only
91
   that register).  For pseudo registers, it is the unique rtx for
92
   that pseudo.  For hard registers, it is an rtx of the mode specified
93
   by reg_raw_mode.
94
 
95
   FIXME: We could put it into emit_status struct, but gengtype is not
96
   able to deal with length attribute nested in top level structures.  */
97
 
98
extern GTY ((length ("crtl->emit.x_reg_rtx_no"))) rtx * regno_reg_rtx;
99
 
100
/* For backward compatibility... eventually these should all go away.  */
101
#define reg_rtx_no (crtl->emit.x_reg_rtx_no)
102
#define seq_stack (crtl->emit.sequence_stack)
103
 
104
#define REGNO_POINTER_ALIGN(REGNO) (crtl->emit.regno_pointer_align[REGNO])
105
 
106
struct GTY(()) expr_status {
107
  /* Number of units that we should eventually pop off the stack.
108
     These are the arguments to function calls that have already returned.  */
109
  int x_pending_stack_adjust;
110
 
111
  /* Under some ABIs, it is the caller's responsibility to pop arguments
112
     pushed for function calls.  A naive implementation would simply pop
113
     the arguments immediately after each call.  However, if several
114
     function calls are made in a row, it is typically cheaper to pop
115
     all the arguments after all of the calls are complete since a
116
     single pop instruction can be used.  Therefore, GCC attempts to
117
     defer popping the arguments until absolutely necessary.  (For
118
     example, at the end of a conditional, the arguments must be popped,
119
     since code outside the conditional won't know whether or not the
120
     arguments need to be popped.)
121
 
122
     When INHIBIT_DEFER_POP is nonzero, however, the compiler does not
123
     attempt to defer pops.  Instead, the stack is popped immediately
124
     after each call.  Rather then setting this variable directly, use
125
     NO_DEFER_POP and OK_DEFER_POP.  */
126
  int x_inhibit_defer_pop;
127
 
128
  /* If PREFERRED_STACK_BOUNDARY and PUSH_ROUNDING are defined, the stack
129
     boundary can be momentarily unaligned while pushing the arguments.
130
     Record the delta since last aligned boundary here in order to get
131
     stack alignment in the nested function calls working right.  */
132
  int x_stack_pointer_delta;
133
 
134
  /* Nonzero means __builtin_saveregs has already been done in this function.
135
     The value is the pseudoreg containing the value __builtin_saveregs
136
     returned.  */
137
  rtx x_saveregs_value;
138
 
139
  /* Similarly for __builtin_apply_args.  */
140
  rtx x_apply_args_value;
141
 
142
  /* List of labels that must never be deleted.  */
143
  rtx x_forced_labels;
144
};
145
 
146
typedef struct call_site_record_d *call_site_record;
147
DEF_VEC_P(call_site_record);
148
DEF_VEC_ALLOC_P(call_site_record, gc);
149
 
150
/* RTL representation of exception handling.  */
151
struct GTY(()) rtl_eh {
152
  rtx ehr_stackadj;
153
  rtx ehr_handler;
154
  rtx ehr_label;
155
 
156
  rtx sjlj_fc;
157
  rtx sjlj_exit_after;
158
 
159
  VEC(uchar,gc) *action_record_data;
160
 
161
  VEC(call_site_record,gc) *call_site_record[2];
162
};
163
 
164
#define pending_stack_adjust (crtl->expr.x_pending_stack_adjust)
165
#define inhibit_defer_pop (crtl->expr.x_inhibit_defer_pop)
166
#define saveregs_value (crtl->expr.x_saveregs_value)
167
#define apply_args_value (crtl->expr.x_apply_args_value)
168
#define forced_labels (crtl->expr.x_forced_labels)
169
#define stack_pointer_delta (crtl->expr.x_stack_pointer_delta)
170
 
171
struct gimple_df;
172
struct temp_slot;
173
typedef struct temp_slot *temp_slot_p;
174
struct call_site_record_d;
175
struct dw_fde_struct;
176
 
177
DEF_VEC_P(temp_slot_p);
178
DEF_VEC_ALLOC_P(temp_slot_p,gc);
179
struct ipa_opt_pass_d;
180
typedef struct ipa_opt_pass_d *ipa_opt_pass;
181
 
182
DEF_VEC_P(ipa_opt_pass);
183
DEF_VEC_ALLOC_P(ipa_opt_pass,heap);
184
 
185
struct GTY(()) varasm_status {
186
  /* If we're using a per-function constant pool, this is it.  */
187
  struct rtx_constant_pool *pool;
188
 
189
  /* Number of tree-constants deferred during the expansion of this
190
     function.  */
191
  unsigned int deferred_constants;
192
};
193
 
194
/* Information mainlined about RTL representation of incoming arguments.  */
195
struct GTY(()) incoming_args {
196
  /* Number of bytes of args popped by function being compiled on its return.
197
     Zero if no bytes are to be popped.
198
     May affect compilation of return insn or of function epilogue.  */
199
  int pops_args;
200
 
201
  /* If function's args have a fixed size, this is that size, in bytes.
202
     Otherwise, it is -1.
203
     May affect compilation of return insn or of function epilogue.  */
204
  int size;
205
 
206
  /* # bytes the prologue should push and pretend that the caller pushed them.
207
     The prologue must do this, but only if parms can be passed in
208
     registers.  */
209
  int pretend_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 info;
218
 
219
  /* The arg pointer hard register, or the pseudo into which it was copied.  */
220
  rtx internal_arg_pointer;
221
};
222
 
223
/* Data for function partitioning.  */
224
struct GTY(()) function_subsections {
225
  /* Assembly labels for the hot and cold text sections, to
226
     be used by debugger functions for determining the size of text
227
     sections.  */
228
 
229
  const char *hot_section_label;
230
  const char *cold_section_label;
231
  const char *hot_section_end_label;
232
  const char *cold_section_end_label;
233
};
234
 
235
/* Describe an empty area of space in the stack frame.  These can be chained
236
   into a list; this is used to keep track of space wasted for alignment
237
   reasons.  */
238
struct GTY(()) frame_space
239
{
240
  struct frame_space *next;
241
 
242
  HOST_WIDE_INT start;
243
  HOST_WIDE_INT length;
244
};
245
 
246
/* Datastructures maintained for currently processed function in RTL form.  */
247
struct GTY(()) rtl_data {
248
  struct expr_status expr;
249
  struct emit_status emit;
250
  struct varasm_status varasm;
251
  struct incoming_args args;
252
  struct function_subsections subsections;
253
  struct rtl_eh eh;
254
 
255
  /* For function.c  */
256
 
257
  /* # of bytes of outgoing arguments.  If ACCUMULATE_OUTGOING_ARGS is
258
     defined, the needed space is pushed by the prologue.  */
259
  int outgoing_args_size;
260
 
261
  /* If nonzero, an RTL expression for the location at which the current
262
     function returns its result.  If the current function returns its
263
     result in a register, current_function_return_rtx will always be
264
     the hard register containing the result.  */
265
  rtx return_rtx;
266
 
267
  /* Opaque pointer used by get_hard_reg_initial_val and
268
     has_hard_reg_initial_val (see integrate.[hc]).  */
269
  struct initial_value_struct *hard_reg_initial_vals;
270
 
271
  /* A variable living at the top of the frame that holds a known value.
272
     Used for detecting stack clobbers.  */
273
  tree stack_protect_guard;
274
 
275
  /* List (chain of EXPR_LIST) of labels heading the current handlers for
276
     nonlocal gotos.  */
277
  rtx x_nonlocal_goto_handler_labels;
278
 
279
  /* Label that will go on function epilogue.
280
     Jumping to this label serves as a "return" instruction
281
     on machines which require execution of the epilogue on all returns.  */
282
  rtx x_return_label;
283
 
284
  /* Label that will go on the end of function epilogue.
285
     Jumping to this label serves as a "naked return" instruction
286
     on machines which require execution of the epilogue on all returns.  */
287
  rtx x_naked_return_label;
288
 
289
  /* List (chain of EXPR_LISTs) of all stack slots in this function.
290
     Made for the sake of unshare_all_rtl.  */
291
  rtx x_stack_slot_list;
292
 
293
  /* List of empty areas in the stack frame.  */
294
  struct frame_space *frame_space_list;
295
 
296
  /* Place after which to insert the tail_recursion_label if we need one.  */
297
  rtx x_stack_check_probe_note;
298
 
299
  /* Location at which to save the argument pointer if it will need to be
300
     referenced.  There are two cases where this is done: if nonlocal gotos
301
     exist, or if vars stored at an offset from the argument pointer will be
302
     needed by inner routines.  */
303
  rtx x_arg_pointer_save_area;
304
 
305
  /* Dynamic Realign Argument Pointer used for realigning stack.  */
306
  rtx drap_reg;
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
  /* Insn after which register parms and SAVE_EXPRs are born, if nonopt.  */
314
  rtx x_parm_birth_insn;
315
 
316
  /* List of all used temporaries allocated, by level.  */
317
  VEC(temp_slot_p,gc) *x_used_temp_slots;
318
 
319
  /* List of available temp slots.  */
320
  struct temp_slot *x_avail_temp_slots;
321
 
322
  /* Current nesting level for temporaries.  */
323
  int x_temp_slot_level;
324
 
325
  /* The largest alignment needed on the stack, including requirement
326
     for outgoing stack alignment.  */
327
  unsigned int stack_alignment_needed;
328
 
329
  /* Preferred alignment of the end of stack frame, which is preferred
330
     to call other functions.  */
331
  unsigned int preferred_stack_boundary;
332
 
333
  /* The minimum alignment of parameter stack.  */
334
  unsigned int parm_stack_boundary;
335
 
336
  /* The largest alignment of slot allocated on the stack.  */
337
  unsigned int max_used_stack_slot_alignment;
338
 
339
  /* The stack alignment estimated before reload, with consideration of
340
     following factors:
341
     1. Alignment of local stack variables (max_used_stack_slot_alignment)
342
     2. Alignment requirement to call other functions
343
        (preferred_stack_boundary)
344
     3. Alignment of non-local stack variables but might be spilled in
345
        local stack.  */
346
  unsigned int stack_alignment_estimated;
347
 
348
  /* For reorg.  */
349
 
350
  /* If some insns can be deferred to the delay slots of the epilogue, the
351
     delay list for them is recorded here.  */
352
  rtx epilogue_delay_list;
353
 
354
  /* Nonzero if function being compiled called builtin_return_addr or
355
     builtin_frame_address with nonzero count.  */
356
  bool accesses_prior_frames;
357
 
358
  /* Nonzero if the function calls __builtin_eh_return.  */
359
  bool calls_eh_return;
360
 
361
  /* Nonzero if function saves all registers, e.g. if it has a nonlocal
362
     label that can reach the exit block via non-exceptional paths. */
363
  bool saves_all_registers;
364
 
365
  /* Nonzero if function being compiled has nonlocal gotos to parent
366
     function.  */
367
  bool has_nonlocal_goto;
368
 
369
  /* Nonzero if function being compiled has an asm statement.  */
370
  bool has_asm_statement;
371
 
372
  /* This bit is used by the exception handling logic.  It is set if all
373
     calls (if any) are sibling calls.  Such functions do not have to
374
     have EH tables generated, as they cannot throw.  A call to such a
375
     function, however, should be treated as throwing if any of its callees
376
     can throw.  */
377
  bool all_throwers_are_sibcalls;
378
 
379
  /* Nonzero if stack limit checking should be enabled in the current
380
     function.  */
381
  bool limit_stack;
382
 
383
  /* Nonzero if profiling code should be generated.  */
384
  bool profile;
385
 
386
  /* Nonzero if the current function uses the constant pool.  */
387
  bool uses_const_pool;
388
 
389
  /* Nonzero if the current function uses pic_offset_table_rtx.  */
390
  bool uses_pic_offset_table;
391
 
392
  /* Nonzero if the current function needs an lsda for exception handling.  */
393
  bool uses_eh_lsda;
394
 
395
  /* Set when the tail call has been produced.  */
396
  bool tail_call_emit;
397
 
398
  /* Nonzero if code to initialize arg_pointer_save_area has been emitted.  */
399
  bool arg_pointer_save_area_init;
400
 
401
  /* Nonzero if current function must be given a frame pointer.
402
     Set in global.c if anything is allocated on the stack there.  */
403
  bool frame_pointer_needed;
404
 
405
  /* When set, expand should optimize for speed.  */
406
  bool maybe_hot_insn_p;
407
 
408
  /* Nonzero if function stack realignment is needed.  This flag may be
409
     set twice: before and after reload.  It is set before reload wrt
410
     stack alignment estimation before reload.  It will be changed after
411
     reload if by then criteria of stack realignment is different.
412
     The value set after reload is the accurate one and is finalized.  */
413
  bool stack_realign_needed;
414
 
415
  /* Nonzero if function stack realignment is tried.  This flag is set
416
     only once before reload.  It affects register elimination.  This
417
     is used to generate DWARF debug info for stack variables.  */
418
  bool stack_realign_tried;
419
 
420
  /* Nonzero if function being compiled needs dynamic realigned
421
     argument pointer (drap) if stack needs realigning.  */
422
  bool need_drap;
423
 
424
  /* Nonzero if function stack realignment estimation is done, namely
425
     stack_realign_needed flag has been set before reload wrt estimated
426
     stack alignment info.  */
427
  bool stack_realign_processed;
428
 
429
  /* Nonzero if function stack realignment has been finalized, namely
430
     stack_realign_needed flag has been set and finalized after reload.  */
431
  bool stack_realign_finalized;
432
 
433
  /* True if dbr_schedule has already been called for this function.  */
434
  bool dbr_scheduled_p;
435
 
436
  /* True if current function can not throw.  Unlike
437
     TREE_NOTHROW (current_function_decl) it is set even for overwritable
438
     function where currently compiled version of it is nothrow.  */
439
  bool nothrow;
440
 
441
  /* True if we performed shrink-wrapping for the current function.  */
442
  bool shrink_wrapped;
443
 
444
  /* Like regs_ever_live, but 1 if a reg is set or clobbered from an
445
     asm.  Unlike regs_ever_live, elements of this array corresponding
446
     to eliminable regs (like the frame pointer) are set if an asm
447
     sets them.  */
448
  HARD_REG_SET asm_clobbers;
449
};
450
 
451
#define return_label (crtl->x_return_label)
452
#define naked_return_label (crtl->x_naked_return_label)
453
#define stack_slot_list (crtl->x_stack_slot_list)
454
#define parm_birth_insn (crtl->x_parm_birth_insn)
455
#define frame_offset (crtl->x_frame_offset)
456
#define stack_check_probe_note (crtl->x_stack_check_probe_note)
457
#define arg_pointer_save_area (crtl->x_arg_pointer_save_area)
458
#define used_temp_slots (crtl->x_used_temp_slots)
459
#define avail_temp_slots (crtl->x_avail_temp_slots)
460
#define temp_slot_level (crtl->x_temp_slot_level)
461
#define nonlocal_goto_handler_labels (crtl->x_nonlocal_goto_handler_labels)
462
#define frame_pointer_needed (crtl->frame_pointer_needed)
463
#define stack_realign_fp (crtl->stack_realign_needed && !crtl->need_drap)
464
#define stack_realign_drap (crtl->stack_realign_needed && crtl->need_drap)
465
 
466
extern GTY(()) struct rtl_data x_rtl;
467
 
468
/* Accessor to RTL datastructures.  We keep them statically allocated now since
469
   we never keep multiple functions.  For threaded compiler we might however
470
   want to do differently.  */
471
#define crtl (&x_rtl)
472
 
473
struct GTY(()) stack_usage
474
{
475
  /* # of bytes of static stack space allocated by the function.  */
476
  HOST_WIDE_INT static_stack_size;
477
 
478
  /* # of bytes of dynamic stack space allocated by the function.  This is
479
     meaningful only if has_unbounded_dynamic_stack_size is zero.  */
480
  HOST_WIDE_INT dynamic_stack_size;
481
 
482
  /* # of bytes of space pushed onto the stack after the prologue.  If
483
     !ACCUMULATE_OUTGOING_ARGS, it contains the outgoing arguments.  */
484
  int pushed_stack_size;
485
 
486
  /* Nonzero if the amount of stack space allocated dynamically cannot
487
     be bounded at compile-time.  */
488
  unsigned int has_unbounded_dynamic_stack_size : 1;
489
};
490
 
491
#define current_function_static_stack_size (cfun->su->static_stack_size)
492
#define current_function_dynamic_stack_size (cfun->su->dynamic_stack_size)
493
#define current_function_pushed_stack_size (cfun->su->pushed_stack_size)
494
#define current_function_has_unbounded_dynamic_stack_size \
495
  (cfun->su->has_unbounded_dynamic_stack_size)
496
#define current_function_allocates_dynamic_stack_space    \
497
  (current_function_dynamic_stack_size != 0               \
498
   || current_function_has_unbounded_dynamic_stack_size)
499
 
500
/* This structure can save all the important global and static variables
501
   describing the status of the current function.  */
502
 
503
struct GTY(()) function {
504
  struct eh_status *eh;
505
 
506
  /* The control flow graph for this function.  */
507
  struct control_flow_graph *cfg;
508
 
509
  /* GIMPLE body for this function.  */
510
  struct gimple_seq_d *gimple_body;
511
 
512
  /* SSA and dataflow information.  */
513
  struct gimple_df *gimple_df;
514
 
515
  /* The loops in this function.  */
516
  struct loops *x_current_loops;
517
 
518
  /* The stack usage of this function.  */
519
  struct stack_usage *su;
520
 
521
  /* Value histograms attached to particular statements.  */
522
  htab_t GTY((skip)) value_histograms;
523
 
524
  /* For function.c.  */
525
 
526
  /* Points to the FUNCTION_DECL of this function.  */
527
  tree decl;
528
 
529
  /* A PARM_DECL that should contain the static chain for this function.
530
     It will be initialized at the beginning of the function.  */
531
  tree static_chain_decl;
532
 
533
  /* An expression that contains the non-local goto save area.  The first
534
     word is the saved frame pointer and the second is the saved stack
535
     pointer.  */
536
  tree nonlocal_goto_save_area;
537
 
538
  /* Vector of function local variables, functions, types and constants.  */
539
  VEC(tree,gc) *local_decls;
540
 
541
  /* For md files.  */
542
 
543
  /* tm.h can use this to store whatever it likes.  */
544
  struct machine_function * GTY ((maybe_undef)) machine;
545
 
546
  /* Language-specific code can use this to store whatever it likes.  */
547
  struct language_function * language;
548
 
549
  /* Used types hash table.  */
550
  htab_t GTY ((param_is (union tree_node))) used_types_hash;
551
 
552
  /* Dwarf2 Frame Description Entry, containing the Call Frame Instructions
553
     used for unwinding.  Only set when either dwarf2 unwinding or dwarf2
554
     debugging is enabled.  */
555
  struct dw_fde_struct *fde;
556
 
557
  /* Last statement uid.  */
558
  int last_stmt_uid;
559
 
560
  /* Function sequence number for profiling, debugging, etc.  */
561
  int funcdef_no;
562
 
563
  /* Line number of the start of the function for debugging purposes.  */
564
  location_t function_start_locus;
565
 
566
  /* Line number of the end of the function.  */
567
  location_t function_end_locus;
568
 
569
  /* Properties used by the pass manager.  */
570
  unsigned int curr_properties;
571
  unsigned int last_verified;
572
 
573
  /* Non-null if the function does something that would prevent it from
574
     being copied; this applies to both versioning and inlining.  Set to
575
     a string describing the reason for failure.  */
576
  const char * GTY((skip)) cannot_be_copied_reason;
577
 
578
  /* Collected bit flags.  */
579
 
580
  /* Number of units of general registers that need saving in stdarg
581
     function.  What unit is depends on the backend, either it is number
582
     of bytes, or it can be number of registers.  */
583
  unsigned int va_list_gpr_size : 8;
584
 
585
  /* Number of units of floating point registers that need saving in stdarg
586
     function.  */
587
  unsigned int va_list_fpr_size : 8;
588
 
589
  /* Nonzero if function being compiled can call setjmp.  */
590
  unsigned int calls_setjmp : 1;
591
 
592
  /* Nonzero if function being compiled can call alloca,
593
     either as a subroutine or builtin.  */
594
  unsigned int calls_alloca : 1;
595
 
596
  /* Nonzero if function being compiled receives nonlocal gotos
597
     from nested functions.  */
598
  unsigned int has_nonlocal_label : 1;
599
 
600
  /* Nonzero if we've set cannot_be_copied_reason.  I.e. if
601
     (cannot_be_copied_set && !cannot_be_copied_reason), the function
602
     can in fact be copied.  */
603
  unsigned int cannot_be_copied_set : 1;
604
 
605
  /* Nonzero if current function uses stdarg.h or equivalent.  */
606
  unsigned int stdarg : 1;
607
 
608
  unsigned int after_inlining : 1;
609
  unsigned int always_inline_functions_inlined : 1;
610
 
611
  /* Nonzero if function being compiled can throw synchronous non-call
612
     exceptions.  */
613
  unsigned int can_throw_non_call_exceptions : 1;
614
 
615
  /* Fields below this point are not set for abstract functions; see
616
     allocate_struct_function.  */
617
 
618
  /* Nonzero if function being compiled needs to be given an address
619
     where the value should be stored.  */
620
  unsigned int returns_struct : 1;
621
 
622
  /* Nonzero if function being compiled needs to
623
     return the address of where it has put a structure value.  */
624
  unsigned int returns_pcc_struct : 1;
625
 
626
  /* Nonzero if pass_tree_profile was run on this function.  */
627
  unsigned int after_tree_profile : 1;
628
 
629
  /* Nonzero if this function has local DECL_HARD_REGISTER variables.
630
     In this case code motion has to be done more carefully.  */
631
  unsigned int has_local_explicit_reg_vars : 1;
632
 
633
  /* Nonzero if the current function is a thunk, i.e., a lightweight
634
     function implemented by the output_mi_thunk hook) that just
635
     adjusts one of its arguments and forwards to another
636
     function.  */
637
  unsigned int is_thunk : 1;
638
};
639
 
640
/* Add the decl D to the local_decls list of FUN.  */
641
 
642
static inline void
643
add_local_decl (struct function *fun, tree d)
644
{
645
  VEC_safe_push (tree, gc, fun->local_decls, d);
646
}
647
 
648
#define FOR_EACH_LOCAL_DECL(FUN, I, D)          \
649
  FOR_EACH_VEC_ELT_REVERSE (tree, (FUN)->local_decls, I, D)
650
 
651
/* If va_list_[gf]pr_size is set to this, it means we don't know how
652
   many units need to be saved.  */
653
#define VA_LIST_MAX_GPR_SIZE    255
654
#define VA_LIST_MAX_FPR_SIZE    255
655
 
656
/* The function currently being compiled.  */
657
extern GTY(()) struct function *cfun;
658
 
659
/* In order to ensure that cfun is not set directly, we redefine it so
660
   that it is not an lvalue.  Rather than assign to cfun, use
661
   push_cfun or set_cfun.  */
662
#define cfun (cfun + 0)
663
 
664
/* Nonzero if we've already converted virtual regs to hard regs.  */
665
extern int virtuals_instantiated;
666
 
667
/* Nonzero if at least one trampoline has been created.  */
668
extern int trampolines_created;
669
 
670
struct GTY(()) types_used_by_vars_entry {
671
  tree type;
672
  tree var_decl;
673
};
674
 
675
/* Hash table making the relationship between a global variable
676
   and the types it references in its initializer. The key of the
677
   entry is a referenced type, and the value is the DECL of the global
678
   variable. types_use_by_vars_do_hash and types_used_by_vars_eq below are
679
   the hash and equality functions to use for this hash table.  */
680
extern GTY((param_is (struct types_used_by_vars_entry))) htab_t
681
  types_used_by_vars_hash;
682
 
683
hashval_t types_used_by_vars_do_hash (const void*);
684
int types_used_by_vars_eq (const void *, const void *);
685
void types_used_by_var_decl_insert (tree type, tree var_decl);
686
 
687
/* During parsing of a global variable, this vector contains the types
688
   referenced by the global variable.  */
689
extern GTY(()) VEC(tree,gc) *types_used_by_cur_var_decl;
690
 
691
 
692
/* cfun shouldn't be set directly; use one of these functions instead.  */
693
extern void set_cfun (struct function *new_cfun);
694
extern void push_cfun (struct function *new_cfun);
695
extern void pop_cfun (void);
696
extern void instantiate_decl_rtl (rtx x);
697
 
698
/* For backward compatibility... eventually these should all go away.  */
699
#define current_function_funcdef_no (cfun->funcdef_no)
700
 
701
#define current_loops (cfun->x_current_loops)
702
#define dom_computed (cfun->cfg->x_dom_computed)
703
#define n_bbs_in_dom_tree (cfun->cfg->x_n_bbs_in_dom_tree)
704
#define VALUE_HISTOGRAMS(fun) (fun)->value_histograms
705
 
706
/* Identify BLOCKs referenced by more than one NOTE_INSN_BLOCK_{BEG,END},
707
   and create duplicate blocks.  */
708
extern void reorder_blocks (void);
709
 
710
/* Set BLOCK_NUMBER for all the blocks in FN.  */
711
extern void number_blocks (tree);
712
 
713
extern void clear_block_marks (tree);
714
extern tree blocks_nreverse (tree);
715
extern tree block_chainon (tree, tree);
716
 
717
/* Return size needed for stack frame based on slots so far allocated.
718
   This size counts from zero.  It is not rounded to STACK_BOUNDARY;
719
   the caller may have to do that.  */
720
extern HOST_WIDE_INT get_frame_size (void);
721
 
722
/* Issue an error message and return TRUE if frame OFFSET overflows in
723
   the signed target pointer arithmetics for function FUNC.  Otherwise
724
   return FALSE.  */
725
extern bool frame_offset_overflow (HOST_WIDE_INT, tree);
726
 
727
/* A pointer to a function to create target specific, per-function
728
   data structures.  */
729
extern struct machine_function * (*init_machine_status) (void);
730
 
731
/* Save and restore status information for a nested function.  */
732
extern void free_after_parsing (struct function *);
733
extern void free_after_compilation (struct function *);
734
 
735
extern void init_varasm_status (void);
736
 
737
#ifdef RTX_CODE
738
extern void diddle_return_value (void (*)(rtx, void*), void*);
739
extern void clobber_return_register (void);
740
#endif
741
 
742
extern rtx get_arg_pointer_save_area (void);
743
 
744
/* Returns the name of the current function.  */
745
extern const char *current_function_name (void);
746
 
747
extern void do_warn_unused_parameter (tree);
748
 
749
extern bool pass_by_reference (CUMULATIVE_ARGS *, enum machine_mode,
750
                               tree, bool);
751
extern bool reference_callee_copied (CUMULATIVE_ARGS *, enum machine_mode,
752
                                     tree, bool);
753
 
754
extern void used_types_insert (tree);
755
 
756
extern int get_next_funcdef_no (void);
757
extern int get_last_funcdef_no (void);
758
 
759
#ifdef HAVE_simple_return
760
extern bool requires_stack_frame_p (rtx, HARD_REG_SET, HARD_REG_SET);
761
#endif                        
762
 
763
/* In predict.c */
764
extern bool optimize_function_for_size_p (struct function *);
765
extern bool optimize_function_for_speed_p (struct function *);
766
 
767
#endif  /* GCC_FUNCTION_H */

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