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1 35 ultra_embe
/* 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 "hashtab.h"
26
#include "vec.h"
27
#include "machmode.h"
28
#include "tm.h"                 /* For CUMULATIVE_ARGS.  */
29
#include "hard-reg-set.h"       /* For HARD_REG_SET in struct rtl_data. */
30
#include "input.h"              /* For location_t.  */
31
 
32
/* Stack of pending (incomplete) sequences saved by `start_sequence'.
33
   Each element describes one pending sequence.
34
   The main insn-chain is saved in the last element of the chain,
35
   unless the chain is empty.  */
36
 
37
struct GTY(()) sequence_stack {
38
  /* First and last insns in the chain of the saved sequence.  */
39
  rtx first;
40
  rtx last;
41
  struct sequence_stack *next;
42
};
43
 
44
struct GTY(()) emit_status {
45
  /* This is reset to LAST_VIRTUAL_REGISTER + 1 at the start of each function.
46
     After rtl generation, it is 1 plus the largest register number used.  */
47
  int x_reg_rtx_no;
48
 
49
  /* Lowest label number in current function.  */
50
  int x_first_label_num;
51
 
52
  /* The ends of the doubly-linked chain of rtl for the current function.
53
     Both are reset to null at the start of rtl generation for the function.
54
 
55
     start_sequence saves both of these on `sequence_stack' and then starts
56
     a new, nested sequence of insns.  */
57
  rtx x_first_insn;
58
  rtx x_last_insn;
59
 
60
  /* Stack of pending (incomplete) sequences saved by `start_sequence'.
61
     Each element describes one pending sequence.
62
     The main insn-chain is saved in the last element of the chain,
63
     unless the chain is empty.  */
64
  struct sequence_stack *sequence_stack;
65
 
66
  /* INSN_UID for next insn emitted.
67
     Reset to 1 for each function compiled.  */
68
  int x_cur_insn_uid;
69
 
70
  /* INSN_UID for next debug insn emitted.  Only used if
71
     --param min-nondebug-insn-uid=<value> is given with nonzero value.  */
72
  int x_cur_debug_insn_uid;
73
 
74
  /* The length of the regno_pointer_align, regno_decl, and x_regno_reg_rtx
75
     vectors.  Since these vectors are needed during the expansion phase when
76
     the total number of registers in the function is not yet known, the
77
     vectors are copied and made bigger when necessary.  */
78
  int regno_pointer_align_length;
79
 
80
  /* Indexed by pseudo register number, if nonzero gives the known alignment
81
     for that pseudo (if REG_POINTER is set in x_regno_reg_rtx).
82
     Allocated in parallel with x_regno_reg_rtx.  */
83
  unsigned char * GTY((skip)) regno_pointer_align;
84
};
85
 
86
 
87
/* Indexed by register number, gives an rtx for that register (and only
88
   that register).  For pseudo registers, it is the unique rtx for
89
   that pseudo.  For hard registers, it is an rtx of the mode specified
90
   by reg_raw_mode.
91
 
92
   FIXME: We could put it into emit_status struct, but gengtype is not
93
   able to deal 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
 
145
/* RTL representation of exception handling.  */
146
struct GTY(()) rtl_eh {
147
  rtx ehr_stackadj;
148
  rtx ehr_handler;
149
  rtx ehr_label;
150
 
151
  rtx sjlj_fc;
152
  rtx sjlj_exit_after;
153
 
154
  vec<uchar, va_gc> *action_record_data;
155
 
156
  vec<call_site_record, va_gc> *call_site_record_v[2];
157
};
158
 
159
#define pending_stack_adjust (crtl->expr.x_pending_stack_adjust)
160
#define inhibit_defer_pop (crtl->expr.x_inhibit_defer_pop)
161
#define saveregs_value (crtl->expr.x_saveregs_value)
162
#define apply_args_value (crtl->expr.x_apply_args_value)
163
#define forced_labels (crtl->expr.x_forced_labels)
164
#define stack_pointer_delta (crtl->expr.x_stack_pointer_delta)
165
 
166
struct gimple_df;
167
struct temp_slot;
168
typedef struct temp_slot *temp_slot_p;
169
struct call_site_record_d;
170
struct dw_fde_struct;
171
 
172
struct ipa_opt_pass_d;
173
typedef struct ipa_opt_pass_d *ipa_opt_pass;
174
 
175
 
176
struct GTY(()) varasm_status {
177
  /* If we're using a per-function constant pool, this is it.  */
178
  struct rtx_constant_pool *pool;
179
 
180
  /* Number of tree-constants deferred during the expansion of this
181
     function.  */
182
  unsigned int deferred_constants;
183
};
184
 
185
/* Information mainlined about RTL representation of incoming arguments.  */
186
struct GTY(()) incoming_args {
187
  /* Number of bytes of args popped by function being compiled on its return.
188
     Zero if no bytes are to be popped.
189
     May affect compilation of return insn or of function epilogue.  */
190
  int pops_args;
191
 
192
  /* If function's args have a fixed size, this is that size, in bytes.
193
     Otherwise, it is -1.
194
     May affect compilation of return insn or of function epilogue.  */
195
  int size;
196
 
197
  /* # bytes the prologue should push and pretend that the caller pushed them.
198
     The prologue must do this, but only if parms can be passed in
199
     registers.  */
200
  int pretend_args_size;
201
 
202
  /* This is the offset from the arg pointer to the place where the first
203
     anonymous arg can be found, if there is one.  */
204
  rtx arg_offset_rtx;
205
 
206
  /* Quantities of various kinds of registers
207
     used for the current function's args.  */
208
  CUMULATIVE_ARGS info;
209
 
210
  /* The arg pointer hard register, or the pseudo into which it was copied.  */
211
  rtx internal_arg_pointer;
212
};
213
 
214
/* Data for function partitioning.  */
215
struct GTY(()) function_subsections {
216
  /* Assembly labels for the hot and cold text sections, to
217
     be used by debugger functions for determining the size of text
218
     sections.  */
219
 
220
  const char *hot_section_label;
221
  const char *cold_section_label;
222
  const char *hot_section_end_label;
223
  const char *cold_section_end_label;
224
};
225
 
226
/* Describe an empty area of space in the stack frame.  These can be chained
227
   into a list; this is used to keep track of space wasted for alignment
228
   reasons.  */
229
struct GTY(()) frame_space
230
{
231
  struct frame_space *next;
232
 
233
  HOST_WIDE_INT start;
234
  HOST_WIDE_INT length;
235
};
236
 
237
/* Datastructures maintained for currently processed function in RTL form.  */
238
struct GTY(()) rtl_data {
239
  struct expr_status expr;
240
  struct emit_status emit;
241
  struct varasm_status varasm;
242
  struct incoming_args args;
243
  struct function_subsections subsections;
244
  struct rtl_eh eh;
245
 
246
  /* For function.c  */
247
 
248
  /* # of bytes of outgoing arguments.  If ACCUMULATE_OUTGOING_ARGS is
249
     defined, the needed space is pushed by the prologue.  */
250
  int outgoing_args_size;
251
 
252
  /* If nonzero, an RTL expression for the location at which the current
253
     function returns its result.  If the current function returns its
254
     result in a register, current_function_return_rtx will always be
255
     the hard register containing the result.  */
256
  rtx return_rtx;
257
 
258
  /* Vector of initial-value pairs.  Each pair consists of a pseudo
259
     register of approprite mode that stores the initial value a hard
260
     register REGNO, and that hard register itself.  */
261
  /* ??? This could be a VEC but there is currently no way to define an
262
         opaque VEC type.  */
263
  struct initial_value_struct *hard_reg_initial_vals;
264
 
265
  /* A variable living at the top of the frame that holds a known value.
266
     Used for detecting stack clobbers.  */
267
  tree stack_protect_guard;
268
 
269
  /* List (chain of EXPR_LIST) of labels heading the current handlers for
270
     nonlocal gotos.  */
271
  rtx x_nonlocal_goto_handler_labels;
272
 
273
  /* Label that will go on function epilogue.
274
     Jumping to this label serves as a "return" instruction
275
     on machines which require execution of the epilogue on all returns.  */
276
  rtx x_return_label;
277
 
278
  /* Label that will go on the end of function epilogue.
279
     Jumping to this label serves as a "naked return" instruction
280
     on machines which require execution of the epilogue on all returns.  */
281
  rtx x_naked_return_label;
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
  /* List of empty areas in the stack frame.  */
288
  struct frame_space *frame_space_list;
289
 
290
  /* Place after which to insert the tail_recursion_label if we need one.  */
291
  rtx x_stack_check_probe_note;
292
 
293
  /* Location at which to save the argument pointer if it will need to be
294
     referenced.  There are two cases where this is done: if nonlocal gotos
295
     exist, or if vars stored at an offset from the argument pointer will be
296
     needed by inner routines.  */
297
  rtx x_arg_pointer_save_area;
298
 
299
  /* Dynamic Realign Argument Pointer used for realigning stack.  */
300
  rtx drap_reg;
301
 
302
  /* Offset to end of allocated area of stack frame.
303
     If stack grows down, this is the address of the last stack slot allocated.
304
     If stack grows up, this is the address for the next slot.  */
305
  HOST_WIDE_INT x_frame_offset;
306
 
307
  /* Insn after which register parms and SAVE_EXPRs are born, if nonopt.  */
308
  rtx x_parm_birth_insn;
309
 
310
  /* List of all used temporaries allocated, by level.  */
311
  vec<temp_slot_p, va_gc> *x_used_temp_slots;
312
 
313
  /* List of available temp slots.  */
314
  struct temp_slot *x_avail_temp_slots;
315
 
316
  /* Current nesting level for temporaries.  */
317
  int x_temp_slot_level;
318
 
319
  /* The largest alignment needed on the stack, including requirement
320
     for outgoing stack alignment.  */
321
  unsigned int stack_alignment_needed;
322
 
323
  /* Preferred alignment of the end of stack frame, which is preferred
324
     to call other functions.  */
325
  unsigned int preferred_stack_boundary;
326
 
327
  /* The minimum alignment of parameter stack.  */
328
  unsigned int parm_stack_boundary;
329
 
330
  /* The largest alignment of slot allocated on the stack.  */
331
  unsigned int max_used_stack_slot_alignment;
332
 
333
  /* The stack alignment estimated before reload, with consideration of
334
     following factors:
335
     1. Alignment of local stack variables (max_used_stack_slot_alignment)
336
     2. Alignment requirement to call other functions
337
        (preferred_stack_boundary)
338
     3. Alignment of non-local stack variables but might be spilled in
339
        local stack.  */
340
  unsigned int stack_alignment_estimated;
341
 
342
  /* For reorg.  */
343
 
344
  /* If some insns can be deferred to the delay slots of the epilogue, the
345
     delay list for them is recorded here.  */
346
  rtx epilogue_delay_list;
347
 
348
  /* Nonzero if function being compiled called builtin_return_addr or
349
     builtin_frame_address with nonzero count.  */
350
  bool accesses_prior_frames;
351
 
352
  /* Nonzero if the function calls __builtin_eh_return.  */
353
  bool calls_eh_return;
354
 
355
  /* Nonzero if function saves all registers, e.g. if it has a nonlocal
356
     label that can reach the exit block via non-exceptional paths. */
357
  bool saves_all_registers;
358
 
359
  /* Nonzero if function being compiled has nonlocal gotos to parent
360
     function.  */
361
  bool has_nonlocal_goto;
362
 
363
  /* Nonzero if function being compiled has an asm statement.  */
364
  bool has_asm_statement;
365
 
366
  /* This bit is used by the exception handling logic.  It is set if all
367
     calls (if any) are sibling calls.  Such functions do not have to
368
     have EH tables generated, as they cannot throw.  A call to such a
369
     function, however, should be treated as throwing if any of its callees
370
     can throw.  */
371
  bool all_throwers_are_sibcalls;
372
 
373
  /* Nonzero if stack limit checking should be enabled in the current
374
     function.  */
375
  bool limit_stack;
376
 
377
  /* Nonzero if profiling code should be generated.  */
378
  bool profile;
379
 
380
  /* Nonzero if the current function uses the constant pool.  */
381
  bool uses_const_pool;
382
 
383
  /* Nonzero if the current function uses pic_offset_table_rtx.  */
384
  bool uses_pic_offset_table;
385
 
386
  /* Nonzero if the current function needs an lsda for exception handling.  */
387
  bool uses_eh_lsda;
388
 
389
  /* Set when the tail call has been produced.  */
390
  bool tail_call_emit;
391
 
392
  /* Nonzero if code to initialize arg_pointer_save_area has been emitted.  */
393
  bool arg_pointer_save_area_init;
394
 
395
  /* Nonzero if current function must be given a frame pointer.
396
     Set in global.c if anything is allocated on the stack there.  */
397
  bool frame_pointer_needed;
398
 
399
  /* When set, expand should optimize for speed.  */
400
  bool maybe_hot_insn_p;
401
 
402
  /* Nonzero if function stack realignment is needed.  This flag may be
403
     set twice: before and after reload.  It is set before reload wrt
404
     stack alignment estimation before reload.  It will be changed after
405
     reload if by then criteria of stack realignment is different.
406
     The value set after reload is the accurate one and is finalized.  */
407
  bool stack_realign_needed;
408
 
409
  /* Nonzero if function stack realignment is tried.  This flag is set
410
     only once before reload.  It affects register elimination.  This
411
     is used to generate DWARF debug info for stack variables.  */
412
  bool stack_realign_tried;
413
 
414
  /* Nonzero if function being compiled needs dynamic realigned
415
     argument pointer (drap) if stack needs realigning.  */
416
  bool need_drap;
417
 
418
  /* Nonzero if function stack realignment estimation is done, namely
419
     stack_realign_needed flag has been set before reload wrt estimated
420
     stack alignment info.  */
421
  bool stack_realign_processed;
422
 
423
  /* Nonzero if function stack realignment has been finalized, namely
424
     stack_realign_needed flag has been set and finalized after reload.  */
425
  bool stack_realign_finalized;
426
 
427
  /* True if dbr_schedule has already been called for this function.  */
428
  bool dbr_scheduled_p;
429
 
430
  /* True if current function can not throw.  Unlike
431
     TREE_NOTHROW (current_function_decl) it is set even for overwritable
432
     function where currently compiled version of it is nothrow.  */
433
  bool nothrow;
434
 
435
  /* True if we performed shrink-wrapping for the current function.  */
436
  bool shrink_wrapped;
437
 
438
  /* Nonzero if function being compiled doesn't modify the stack pointer
439
     (ignoring the prologue and epilogue).  This is only valid after
440
     pass_stack_ptr_mod has run.  */
441
  bool sp_is_unchanging;
442
 
443
  /* Nonzero if function being compiled doesn't contain any calls
444
     (ignoring the prologue and epilogue).  This is set prior to
445
     local register allocation and is valid for the remaining
446
     compiler passes.  */
447
  bool is_leaf;
448
 
449
  /* Nonzero if the function being compiled is a leaf function which only
450
     uses leaf registers.  This is valid after reload (specifically after
451
     sched2) and is useful only if the port defines LEAF_REGISTERS.  */
452
  bool uses_only_leaf_regs;
453
 
454
  /* Like regs_ever_live, but 1 if a reg is set or clobbered from an
455
     asm.  Unlike regs_ever_live, elements of this array corresponding
456
     to eliminable regs (like the frame pointer) are set if an asm
457
     sets them.  */
458
  HARD_REG_SET asm_clobbers;
459
};
460
 
461
#define return_label (crtl->x_return_label)
462
#define naked_return_label (crtl->x_naked_return_label)
463
#define stack_slot_list (crtl->x_stack_slot_list)
464
#define parm_birth_insn (crtl->x_parm_birth_insn)
465
#define frame_offset (crtl->x_frame_offset)
466
#define stack_check_probe_note (crtl->x_stack_check_probe_note)
467
#define arg_pointer_save_area (crtl->x_arg_pointer_save_area)
468
#define used_temp_slots (crtl->x_used_temp_slots)
469
#define avail_temp_slots (crtl->x_avail_temp_slots)
470
#define temp_slot_level (crtl->x_temp_slot_level)
471
#define nonlocal_goto_handler_labels (crtl->x_nonlocal_goto_handler_labels)
472
#define frame_pointer_needed (crtl->frame_pointer_needed)
473
#define stack_realign_fp (crtl->stack_realign_needed && !crtl->need_drap)
474
#define stack_realign_drap (crtl->stack_realign_needed && crtl->need_drap)
475
 
476
extern GTY(()) struct rtl_data x_rtl;
477
 
478
/* Accessor to RTL datastructures.  We keep them statically allocated now since
479
   we never keep multiple functions.  For threaded compiler we might however
480
   want to do differently.  */
481
#define crtl (&x_rtl)
482
 
483
struct GTY(()) stack_usage
484
{
485
  /* # of bytes of static stack space allocated by the function.  */
486
  HOST_WIDE_INT static_stack_size;
487
 
488
  /* # of bytes of dynamic stack space allocated by the function.  This is
489
     meaningful only if has_unbounded_dynamic_stack_size is zero.  */
490
  HOST_WIDE_INT dynamic_stack_size;
491
 
492
  /* # of bytes of space pushed onto the stack after the prologue.  If
493
     !ACCUMULATE_OUTGOING_ARGS, it contains the outgoing arguments.  */
494
  int pushed_stack_size;
495
 
496
  /* Nonzero if the amount of stack space allocated dynamically cannot
497
     be bounded at compile-time.  */
498
  unsigned int has_unbounded_dynamic_stack_size : 1;
499
};
500
 
501
#define current_function_static_stack_size (cfun->su->static_stack_size)
502
#define current_function_dynamic_stack_size (cfun->su->dynamic_stack_size)
503
#define current_function_pushed_stack_size (cfun->su->pushed_stack_size)
504
#define current_function_has_unbounded_dynamic_stack_size \
505
  (cfun->su->has_unbounded_dynamic_stack_size)
506
#define current_function_allocates_dynamic_stack_space    \
507
  (current_function_dynamic_stack_size != 0               \
508
   || current_function_has_unbounded_dynamic_stack_size)
509
 
510
/* This structure can save all the important global and static variables
511
   describing the status of the current function.  */
512
 
513
struct GTY(()) function {
514
  struct eh_status *eh;
515
 
516
  /* The control flow graph for this function.  */
517
  struct control_flow_graph *cfg;
518
 
519
  /* GIMPLE body for this function.  */
520
  gimple_seq gimple_body;
521
 
522
  /* SSA and dataflow information.  */
523
  struct gimple_df *gimple_df;
524
 
525
  /* The loops in this function.  */
526
  struct loops *x_current_loops;
527
 
528
  /* The stack usage of this function.  */
529
  struct stack_usage *su;
530
 
531
  /* Value histograms attached to particular statements.  */
532
  htab_t GTY((skip)) value_histograms;
533
 
534
  /* For function.c.  */
535
 
536
  /* Points to the FUNCTION_DECL of this function.  */
537
  tree decl;
538
 
539
  /* A PARM_DECL that should contain the static chain for this function.
540
     It will be initialized at the beginning of the function.  */
541
  tree static_chain_decl;
542
 
543
  /* An expression that contains the non-local goto save area.  The first
544
     word is the saved frame pointer and the second is the saved stack
545
     pointer.  */
546
  tree nonlocal_goto_save_area;
547
 
548
  /* Vector of function local variables, functions, types and constants.  */
549
  vec<tree, va_gc> *local_decls;
550
 
551
  /* For md files.  */
552
 
553
  /* tm.h can use this to store whatever it likes.  */
554
  struct machine_function * GTY ((maybe_undef)) machine;
555
 
556
  /* Language-specific code can use this to store whatever it likes.  */
557
  struct language_function * language;
558
 
559
  /* Used types hash table.  */
560
  htab_t GTY ((param_is (union tree_node))) used_types_hash;
561
 
562
  /* Dwarf2 Frame Description Entry, containing the Call Frame Instructions
563
     used for unwinding.  Only set when either dwarf2 unwinding or dwarf2
564
     debugging is enabled.  */
565
  struct dw_fde_struct *fde;
566
 
567
  /* Last statement uid.  */
568
  int last_stmt_uid;
569
 
570
  /* Function sequence number for profiling, debugging, etc.  */
571
  int funcdef_no;
572
 
573
  /* Line number of the start of the function for debugging purposes.  */
574
  location_t function_start_locus;
575
 
576
  /* Line number of the end of the function.  */
577
  location_t function_end_locus;
578
 
579
  /* Properties used by the pass manager.  */
580
  unsigned int curr_properties;
581
  unsigned int last_verified;
582
 
583
  /* Non-null if the function does something that would prevent it from
584
     being copied; this applies to both versioning and inlining.  Set to
585
     a string describing the reason for failure.  */
586
  const char * GTY((skip)) cannot_be_copied_reason;
587
 
588
  /* Collected bit flags.  */
589
 
590
  /* Number of units of general registers that need saving in stdarg
591
     function.  What unit is depends on the backend, either it is number
592
     of bytes, or it can be number of registers.  */
593
  unsigned int va_list_gpr_size : 8;
594
 
595
  /* Number of units of floating point registers that need saving in stdarg
596
     function.  */
597
  unsigned int va_list_fpr_size : 8;
598
 
599
  /* Nonzero if function being compiled can call setjmp.  */
600
  unsigned int calls_setjmp : 1;
601
 
602
  /* Nonzero if function being compiled can call alloca,
603
     either as a subroutine or builtin.  */
604
  unsigned int calls_alloca : 1;
605
 
606
  /* Nonzero if function being compiled receives nonlocal gotos
607
     from nested functions.  */
608
  unsigned int has_nonlocal_label : 1;
609
 
610
  /* Nonzero if we've set cannot_be_copied_reason.  I.e. if
611
     (cannot_be_copied_set && !cannot_be_copied_reason), the function
612
     can in fact be copied.  */
613
  unsigned int cannot_be_copied_set : 1;
614
 
615
  /* Nonzero if current function uses stdarg.h or equivalent.  */
616
  unsigned int stdarg : 1;
617
 
618
  unsigned int after_inlining : 1;
619
  unsigned int always_inline_functions_inlined : 1;
620
 
621
  /* Nonzero if function being compiled can throw synchronous non-call
622
     exceptions.  */
623
  unsigned int can_throw_non_call_exceptions : 1;
624
 
625
  /* Nonzero if instructions that may throw exceptions but don't otherwise
626
     contribute to the execution of the program can be deleted.  */
627
  unsigned int can_delete_dead_exceptions : 1;
628
 
629
  /* Fields below this point are not set for abstract functions; see
630
     allocate_struct_function.  */
631
 
632
  /* Nonzero if function being compiled needs to be given an address
633
     where the value should be stored.  */
634
  unsigned int returns_struct : 1;
635
 
636
  /* Nonzero if function being compiled needs to
637
     return the address of where it has put a structure value.  */
638
  unsigned int returns_pcc_struct : 1;
639
 
640
  /* Nonzero if this function has local DECL_HARD_REGISTER variables.
641
     In this case code motion has to be done more carefully.  */
642
  unsigned int has_local_explicit_reg_vars : 1;
643
 
644
  /* Nonzero if the current function is a thunk, i.e., a lightweight
645
     function implemented by the output_mi_thunk hook) that just
646
     adjusts one of its arguments and forwards to another
647
     function.  */
648
  unsigned int is_thunk : 1;
649
};
650
 
651
/* Add the decl D to the local_decls list of FUN.  */
652
 
653
static inline void
654
add_local_decl (struct function *fun, tree d)
655
{
656
  vec_safe_push (fun->local_decls, d);
657
}
658
 
659
#define FOR_EACH_LOCAL_DECL(FUN, I, D)          \
660
  FOR_EACH_VEC_SAFE_ELT_REVERSE ((FUN)->local_decls, I, D)
661
 
662
/* If va_list_[gf]pr_size is set to this, it means we don't know how
663
   many units need to be saved.  */
664
#define VA_LIST_MAX_GPR_SIZE    255
665
#define VA_LIST_MAX_FPR_SIZE    255
666
 
667
/* The function currently being compiled.  */
668
extern GTY(()) struct function *cfun;
669
 
670
/* In order to ensure that cfun is not set directly, we redefine it so
671
   that it is not an lvalue.  Rather than assign to cfun, use
672
   push_cfun or set_cfun.  */
673
#define cfun (cfun + 0)
674
 
675
/* Nonzero if we've already converted virtual regs to hard regs.  */
676
extern int virtuals_instantiated;
677
 
678
/* Nonzero if at least one trampoline has been created.  */
679
extern int trampolines_created;
680
 
681
struct GTY(()) types_used_by_vars_entry {
682
  tree type;
683
  tree var_decl;
684
};
685
 
686
/* Hash table making the relationship between a global variable
687
   and the types it references in its initializer. The key of the
688
   entry is a referenced type, and the value is the DECL of the global
689
   variable. types_use_by_vars_do_hash and types_used_by_vars_eq below are
690
   the hash and equality functions to use for this hash table.  */
691
extern GTY((param_is (struct types_used_by_vars_entry))) htab_t
692
  types_used_by_vars_hash;
693
 
694
hashval_t types_used_by_vars_do_hash (const void*);
695
int types_used_by_vars_eq (const void *, const void *);
696
void types_used_by_var_decl_insert (tree type, tree var_decl);
697
 
698
/* During parsing of a global variable, this vector contains the types
699
   referenced by the global variable.  */
700
extern GTY(()) vec<tree, va_gc> *types_used_by_cur_var_decl;
701
 
702
/* cfun shouldn't be set directly; use one of these functions instead.  */
703
extern void set_cfun (struct function *new_cfun);
704
extern void push_cfun (struct function *new_cfun);
705
extern void pop_cfun (void);
706
extern void instantiate_decl_rtl (rtx x);
707
 
708
/* For backward compatibility... eventually these should all go away.  */
709
#define current_function_funcdef_no (cfun->funcdef_no)
710
 
711
#define current_loops (cfun->x_current_loops)
712
#define dom_computed (cfun->cfg->x_dom_computed)
713
#define n_bbs_in_dom_tree (cfun->cfg->x_n_bbs_in_dom_tree)
714
#define VALUE_HISTOGRAMS(fun) (fun)->value_histograms
715
 
716
/* Identify BLOCKs referenced by more than one NOTE_INSN_BLOCK_{BEG,END},
717
   and create duplicate blocks.  */
718
extern void reorder_blocks (void);
719
 
720
/* Set BLOCK_NUMBER for all the blocks in FN.  */
721
extern void number_blocks (tree);
722
 
723
extern void clear_block_marks (tree);
724
extern tree blocks_nreverse (tree);
725
extern tree block_chainon (tree, tree);
726
 
727
/* Return size needed for stack frame based on slots so far allocated.
728
   This size counts from zero.  It is not rounded to STACK_BOUNDARY;
729
   the caller may have to do that.  */
730
extern HOST_WIDE_INT get_frame_size (void);
731
 
732
/* Issue an error message and return TRUE if frame OFFSET overflows in
733
   the signed target pointer arithmetics for function FUNC.  Otherwise
734
   return FALSE.  */
735
extern bool frame_offset_overflow (HOST_WIDE_INT, tree);
736
 
737
/* A pointer to a function to create target specific, per-function
738
   data structures.  */
739
extern struct machine_function * (*init_machine_status) (void);
740
 
741
/* Save and restore status information for a nested function.  */
742
extern void free_after_parsing (struct function *);
743
extern void free_after_compilation (struct function *);
744
 
745
extern void init_varasm_status (void);
746
 
747
#ifdef RTX_CODE
748
extern void diddle_return_value (void (*)(rtx, void*), void*);
749
extern void clobber_return_register (void);
750
#endif
751
 
752
extern rtx get_arg_pointer_save_area (void);
753
 
754
/* Returns the name of the current function.  */
755
extern const char *fndecl_name (tree);
756
extern const char *function_name (struct function *);
757
extern const char *current_function_name (void);
758
 
759
extern void do_warn_unused_parameter (tree);
760
 
761
extern bool pass_by_reference (CUMULATIVE_ARGS *, enum machine_mode,
762
                               tree, bool);
763
extern bool reference_callee_copied (CUMULATIVE_ARGS *, enum machine_mode,
764
                                     tree, bool);
765
 
766
extern void used_types_insert (tree);
767
 
768
extern int get_next_funcdef_no (void);
769
extern int get_last_funcdef_no (void);
770
 
771
#ifdef HAVE_simple_return
772
extern bool requires_stack_frame_p (rtx, HARD_REG_SET, HARD_REG_SET);
773
#endif                        
774
 
775
extern rtx get_hard_reg_initial_val (enum machine_mode, unsigned int);
776
extern rtx has_hard_reg_initial_val (enum machine_mode, unsigned int);
777
extern rtx get_hard_reg_initial_reg (rtx);
778
extern bool initial_value_entry (int i, rtx *, rtx *);
779
 
780
/* Called from gimple_expand_cfg.  */
781
extern unsigned int emit_initial_value_sets (void);
782
 
783
/* In predict.c */
784
extern bool optimize_function_for_size_p (struct function *);
785
extern bool optimize_function_for_speed_p (struct function *);
786
 
787
#endif  /* GCC_FUNCTION_H */

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