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/* 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, 2007 Free Software Foundation, Inc.
4
 
5
This file is part of GCC.
6
 
7
GCC is free software; you can redistribute it and/or modify it under
8
the terms of the GNU General Public License as published by the Free
9
Software Foundation; either version 3, or (at your option) any later
10
version.
11
 
12
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13
WARRANTY; without even the implied warranty of MERCHANTABILITY or
14
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
15
for more details.
16
 
17
You should have received a copy of the GNU General Public License
18
along with GCC; see the file COPYING3.  If not see
19
<http://www.gnu.org/licenses/>.  */
20
 
21
#ifndef GCC_FUNCTION_H
22
#define GCC_FUNCTION_H
23
 
24
#include "tree.h"
25
#include "hashtab.h"
26
 
27
struct var_refs_queue GTY(())
28
{
29
  rtx modified;
30
  enum machine_mode promoted_mode;
31
  int unsignedp;
32
  struct var_refs_queue *next;
33
};
34
 
35
/* Stack of pending (incomplete) sequences saved by `start_sequence'.
36
   Each element describes one pending sequence.
37
   The main insn-chain is saved in the last element of the chain,
38
   unless the chain is empty.  */
39
 
40
struct sequence_stack GTY(())
41
{
42
  /* First and last insns in the chain of the saved sequence.  */
43
  rtx first;
44
  rtx last;
45
  struct sequence_stack *next;
46
};
47
 
48
extern struct sequence_stack *sequence_stack;
49
 
50
/* Stack of single obstacks.  */
51
 
52
struct simple_obstack_stack
53
{
54
  struct obstack *obstack;
55
  struct simple_obstack_stack *next;
56
};
57
 
58
struct emit_status GTY(())
59
{
60
  /* This is reset to LAST_VIRTUAL_REGISTER + 1 at the start of each function.
61
     After rtl generation, it is 1 plus the largest register number used.  */
62
  int x_reg_rtx_no;
63
 
64
  /* Lowest label number in current function.  */
65
  int x_first_label_num;
66
 
67
  /* The ends of the doubly-linked chain of rtl for the current function.
68
     Both are reset to null at the start of rtl generation for the function.
69
 
70
     start_sequence saves both of these on `sequence_stack' and then starts
71
     a new, nested sequence of insns.  */
72
  rtx x_first_insn;
73
  rtx x_last_insn;
74
 
75
  /* Stack of pending (incomplete) sequences saved by `start_sequence'.
76
     Each element describes one pending sequence.
77
     The main insn-chain is saved in the last element of the chain,
78
     unless the chain is empty.  */
79
  struct sequence_stack *sequence_stack;
80
 
81
  /* INSN_UID for next insn emitted.
82
     Reset to 1 for each function compiled.  */
83
  int x_cur_insn_uid;
84
 
85
  /* Location the last line-number NOTE emitted.
86
     This is used to avoid generating duplicates.  */
87
  location_t x_last_location;
88
 
89
  /* The length of the regno_pointer_align, regno_decl, and x_regno_reg_rtx
90
     vectors.  Since these vectors are needed during the expansion phase when
91
     the total number of registers in the function is not yet known, the
92
     vectors are copied and made bigger when necessary.  */
93
  int regno_pointer_align_length;
94
 
95
  /* Indexed by pseudo register number, if nonzero gives the known alignment
96
     for that pseudo (if REG_POINTER is set in x_regno_reg_rtx).
97
     Allocated in parallel with x_regno_reg_rtx.  */
98
  unsigned char * GTY ((length ("%h.x_reg_rtx_no")))
99
    regno_pointer_align;
100
 
101
  /* Indexed by pseudo register number, gives the rtx for that pseudo.
102
     Allocated in parallel with regno_pointer_align.  */
103
  rtx * GTY ((length ("%h.x_reg_rtx_no"))) x_regno_reg_rtx;
104
};
105
 
106
/* For backward compatibility... eventually these should all go away.  */
107
#define reg_rtx_no (cfun->emit->x_reg_rtx_no)
108
#define regno_reg_rtx (cfun->emit->x_regno_reg_rtx)
109
#define seq_stack (cfun->emit->sequence_stack)
110
 
111
#define REGNO_POINTER_ALIGN(REGNO) (cfun->emit->regno_pointer_align[REGNO])
112
 
113
struct expr_status GTY(())
114
{
115
  /* Number of units that we should eventually pop off the stack.
116
     These are the arguments to function calls that have already returned.  */
117
  int x_pending_stack_adjust;
118
 
119
  /* Under some ABIs, it is the caller's responsibility to pop arguments
120
     pushed for function calls.  A naive implementation would simply pop
121
     the arguments immediately after each call.  However, if several
122
     function calls are made in a row, it is typically cheaper to pop
123
     all the arguments after all of the calls are complete since a
124
     single pop instruction can be used.  Therefore, GCC attempts to
125
     defer popping the arguments until absolutely necessary.  (For
126
     example, at the end of a conditional, the arguments must be popped,
127
     since code outside the conditional won't know whether or not the
128
     arguments need to be popped.)
129
 
130
     When INHIBIT_DEFER_POP is nonzero, however, the compiler does not
131
     attempt to defer pops.  Instead, the stack is popped immediately
132
     after each call.  Rather then setting this variable directly, use
133
     NO_DEFER_POP and OK_DEFER_POP.  */
134
  int x_inhibit_defer_pop;
135
 
136
  /* If PREFERRED_STACK_BOUNDARY and PUSH_ROUNDING are defined, the stack
137
     boundary can be momentarily unaligned while pushing the arguments.
138
     Record the delta since last aligned boundary here in order to get
139
     stack alignment in the nested function calls working right.  */
140
  int x_stack_pointer_delta;
141
 
142
  /* Nonzero means __builtin_saveregs has already been done in this function.
143
     The value is the pseudoreg containing the value __builtin_saveregs
144
     returned.  */
145
  rtx x_saveregs_value;
146
 
147
  /* Similarly for __builtin_apply_args.  */
148
  rtx x_apply_args_value;
149
 
150
  /* List of labels that must never be deleted.  */
151
  rtx x_forced_labels;
152
};
153
 
154
#define pending_stack_adjust (cfun->expr->x_pending_stack_adjust)
155
#define inhibit_defer_pop (cfun->expr->x_inhibit_defer_pop)
156
#define saveregs_value (cfun->expr->x_saveregs_value)
157
#define apply_args_value (cfun->expr->x_apply_args_value)
158
#define forced_labels (cfun->expr->x_forced_labels)
159
#define stack_pointer_delta (cfun->expr->x_stack_pointer_delta)
160
 
161
struct temp_slot;
162
typedef struct temp_slot *temp_slot_p;
163
 
164
DEF_VEC_P(temp_slot_p);
165
DEF_VEC_ALLOC_P(temp_slot_p,gc);
166
 
167
enum function_frequency {
168
  /* This function most likely won't be executed at all.
169
     (set only when profile feedback is available).  */
170
  FUNCTION_FREQUENCY_UNLIKELY_EXECUTED,
171
  /* The default value.  */
172
  FUNCTION_FREQUENCY_NORMAL,
173
  /* Optimize this function hard
174
     (set only when profile feedback is available).  */
175
  FUNCTION_FREQUENCY_HOT
176
};
177
 
178
/* This structure can save all the important global and static variables
179
   describing the status of the current function.  */
180
 
181
struct function GTY(())
182
{
183
  struct eh_status *eh;
184
  struct expr_status *expr;
185
  struct emit_status *emit;
186
  struct varasm_status *varasm;
187
 
188
  /* The control flow graph for this function.  */
189
  struct control_flow_graph *cfg;
190
 
191
  /* For function.c.  */
192
 
193
  /* Points to the FUNCTION_DECL of this function.  */
194
  tree decl;
195
 
196
  /* Function containing this function, if any.  */
197
  struct function *outer;
198
 
199
  /* Number of bytes of args popped by function being compiled on its return.
200
     Zero if no bytes are to be popped.
201
     May affect compilation of return insn or of function epilogue.  */
202
  int pops_args;
203
 
204
  /* If function's args have a fixed size, this is that size, in bytes.
205
     Otherwise, it is -1.
206
     May affect compilation of return insn or of function epilogue.  */
207
  int args_size;
208
 
209
  /* # bytes the prologue should push and pretend that the caller pushed them.
210
     The prologue must do this, but only if parms can be passed in
211
     registers.  */
212
  int pretend_args_size;
213
 
214
  /* # of bytes of outgoing arguments.  If ACCUMULATE_OUTGOING_ARGS is
215
     defined, the needed space is pushed by the prologue.  */
216
  int outgoing_args_size;
217
 
218
  /* This is the offset from the arg pointer to the place where the first
219
     anonymous arg can be found, if there is one.  */
220
  rtx arg_offset_rtx;
221
 
222
  /* Quantities of various kinds of registers
223
     used for the current function's args.  */
224
  CUMULATIVE_ARGS args_info;
225
 
226
  /* If nonzero, an RTL expression for the location at which the current
227
     function returns its result.  If the current function returns its
228
     result in a register, current_function_return_rtx will always be
229
     the hard register containing the result.  */
230
  rtx return_rtx;
231
 
232
  /* The arg pointer hard register, or the pseudo into which it was copied.  */
233
  rtx internal_arg_pointer;
234
 
235
  /* Opaque pointer used by get_hard_reg_initial_val and
236
     has_hard_reg_initial_val (see integrate.[hc]).  */
237
  struct initial_value_struct *hard_reg_initial_vals;
238
 
239
  /* List (chain of EXPR_LIST) of labels heading the current handlers for
240
     nonlocal gotos.  */
241
  rtx x_nonlocal_goto_handler_labels;
242
 
243
  /* Label that will go on function epilogue.
244
     Jumping to this label serves as a "return" instruction
245
     on machines which require execution of the epilogue on all returns.  */
246
  rtx x_return_label;
247
 
248
  /* Label that will go on the end of function epilogue.
249
     Jumping to this label serves as a "naked return" instruction
250
     on machines which require execution of the epilogue on all returns.  */
251
  rtx x_naked_return_label;
252
 
253
  /* List (chain of EXPR_LISTs) of all stack slots in this function.
254
     Made for the sake of unshare_all_rtl.  */
255
  rtx x_stack_slot_list;
256
 
257
  /* Place after which to insert the tail_recursion_label if we need one.  */
258
  rtx x_stack_check_probe_note;
259
 
260
  /* Location at which to save the argument pointer if it will need to be
261
     referenced.  There are two cases where this is done: if nonlocal gotos
262
     exist, or if vars stored at an offset from the argument pointer will be
263
     needed by inner routines.  */
264
  rtx x_arg_pointer_save_area;
265
 
266
  /* Offset to end of allocated area of stack frame.
267
     If stack grows down, this is the address of the last stack slot allocated.
268
     If stack grows up, this is the address for the next slot.  */
269
  HOST_WIDE_INT x_frame_offset;
270
 
271
  /* A PARM_DECL that should contain the static chain for this function.
272
     It will be initialized at the beginning of the function.  */
273
  tree static_chain_decl;
274
 
275
  /* An expression that contains the non-local goto save area.  The first
276
     word is the saved frame pointer and the second is the saved stack
277
     pointer.  */
278
  tree nonlocal_goto_save_area;
279
 
280
  /* Insn after which register parms and SAVE_EXPRs are born, if nonopt.  */
281
  rtx x_parm_birth_insn;
282
 
283
  /* List of all used temporaries allocated, by level.  */
284
  VEC(temp_slot_p,gc) *x_used_temp_slots;
285
 
286
  /* List of available temp slots.  */
287
  struct temp_slot *x_avail_temp_slots;
288
 
289
  /* This slot is initialized as 0 and is added to
290
     during the nested function.  */
291
  struct var_refs_queue *fixup_var_refs_queue;
292
 
293
  /* Current nesting level for temporaries.  */
294
  int x_temp_slot_level;
295
 
296
  /* Highest label number in current function.  */
297
  int inl_max_label_num;
298
 
299
  /* Function sequence number for profiling, debugging, etc.  */
300
  int funcdef_no;
301
 
302
  /* For flow.c.  */
303
 
304
  /* Highest loop depth seen so far in loop analysis.  Used in flow.c
305
     for the "failure strategy" when doing liveness analysis starting
306
     with non-empty initial sets.  */
307
  int max_loop_depth;
308
 
309
  /* For md files.  */
310
 
311
  /* tm.h can use this to store whatever it likes.  */
312
  struct machine_function * GTY ((maybe_undef)) machine;
313
 
314
  /* The largest alignment of slot allocated on the stack.  */
315
  unsigned int stack_alignment_needed;
316
 
317
  /* Preferred alignment of the end of stack frame.  */
318
  unsigned int preferred_stack_boundary;
319
 
320
  /* Language-specific code can use this to store whatever it likes.  */
321
  struct language_function * language;
322
 
323
  /* Used types hash table.  */
324
  htab_t GTY ((param_is (union tree_node))) used_types_hash;
325
 
326
  /* For reorg.  */
327
 
328
  /* If some insns can be deferred to the delay slots of the epilogue, the
329
     delay list for them is recorded here.  */
330
  rtx epilogue_delay_list;
331
 
332
  /* Maximal number of entities in the single jumptable.  Used to estimate
333
     final flowgraph size.  */
334
  int max_jumptable_ents;
335
 
336
  /* UIDs for LABEL_DECLs.  */
337
  int last_label_uid;
338
 
339
  /* Line number of the end of the function.  */
340
  location_t function_end_locus;
341
 
342
  /* Array mapping insn uids to blocks.  */
343
  VEC(tree,gc) *ib_boundaries_block;
344
 
345
  /* The variables unexpanded so far.  */
346
  tree unexpanded_var_list;
347
 
348
  /* Assembly labels for the hot and cold text sections, to
349
     be used by debugger functions for determining the size of text
350
     sections.  */
351
 
352
  const char *hot_section_label;
353
  const char *cold_section_label;
354
  const char *hot_section_end_label;
355
  const char *cold_section_end_label;
356
 
357
  /* String to be used for name of cold text sections, via
358
     targetm.asm_out.named_section.  */
359
 
360
  const char *unlikely_text_section_name;
361
 
362
  /* A variable living at the top of the frame that holds a known value.
363
     Used for detecting stack clobbers.  */
364
  tree stack_protect_guard;
365
 
366
  /* Collected bit flags.  */
367
 
368
  /* Nonzero if function being compiled needs to be given an address
369
     where the value should be stored.  */
370
  unsigned int returns_struct : 1;
371
 
372
  /* Nonzero if function being compiled needs to
373
     return the address of where it has put a structure value.  */
374
  unsigned int returns_pcc_struct : 1;
375
 
376
  /* Nonzero if the current function returns a pointer type.  */
377
  unsigned int returns_pointer : 1;
378
 
379
  /* Nonzero if function being compiled can call setjmp.  */
380
  unsigned int calls_setjmp : 1;
381
 
382
  /* Nonzero if function being compiled can call alloca,
383
     either as a subroutine or builtin.  */
384
  unsigned int calls_alloca : 1;
385
 
386
  /* Nonzero if function being compiled called builtin_return_addr or
387
     builtin_frame_address with nonzero count.  */
388
  unsigned int accesses_prior_frames : 1;
389
 
390
  /* Nonzero if the function calls __builtin_eh_return.  */
391
  unsigned int calls_eh_return : 1;
392
 
393
  /* Nonzero if function being compiled receives nonlocal gotos
394
     from nested functions.  */
395
  unsigned int has_nonlocal_label : 1;
396
 
397
  /* Nonzero if function being compiled has nonlocal gotos to parent
398
     function.  */
399
  unsigned int has_nonlocal_goto : 1;
400
 
401
  /* Nonzero if the current function is a thunk, i.e., a lightweight
402
     function implemented by the output_mi_thunk hook) that just
403
     adjusts one of its arguments and forwards to another
404
     function.  */
405
  unsigned int is_thunk : 1;
406
 
407
  /* This bit is used by the exception handling logic.  It is set if all
408
     calls (if any) are sibling calls.  Such functions do not have to
409
     have EH tables generated, as they cannot throw.  A call to such a
410
     function, however, should be treated as throwing if any of its callees
411
     can throw.  */
412
  unsigned int all_throwers_are_sibcalls : 1;
413
 
414
  /* Nonzero if profiling code should be generated.  */
415
  unsigned int profile : 1;
416
 
417
  /* Nonzero if stack limit checking should be enabled in the current
418
     function.  */
419
  unsigned int limit_stack : 1;
420
 
421
  /* Nonzero if current function uses stdarg.h or equivalent.  */
422
  unsigned int stdarg : 1;
423
 
424
  /* Nonzero if the back-end should not keep track of expressions that
425
     determine the size of variable-sized objects.  Normally, such
426
     expressions are saved away, and then expanded when the next
427
     function is started.  For example, if a parameter has a
428
     variable-sized type, then the size of the parameter is computed
429
     when the function body is entered.  However, some front-ends do
430
     not desire this behavior.  */
431
  unsigned int x_dont_save_pending_sizes_p : 1;
432
 
433
  /* Nonzero if the current function uses the constant pool.  */
434
  unsigned int uses_const_pool : 1;
435
 
436
  /* Nonzero if the current function uses pic_offset_table_rtx.  */
437
  unsigned int uses_pic_offset_table : 1;
438
 
439
  /* Nonzero if the current function needs an lsda for exception handling.  */
440
  unsigned int uses_eh_lsda : 1;
441
 
442
  /* Nonzero if code to initialize arg_pointer_save_area has been emitted.  */
443
  unsigned int arg_pointer_save_area_init : 1;
444
 
445
  unsigned int after_inlining : 1;
446
 
447
  /* Set when the call to function itself has been emit.  */
448
  unsigned int recursive_call_emit : 1;
449
 
450
  /* Set when the tail call has been produced.  */
451
  unsigned int tail_call_emit : 1;
452
 
453
  /* How commonly executed the function is.  Initialized during branch
454
     probabilities pass.  */
455
  ENUM_BITFIELD (function_frequency) function_frequency : 2;
456
 
457
  /* Number of units of general registers that need saving in stdarg
458
     function.  What unit is depends on the backend, either it is number
459
     of bytes, or it can be number of registers.  */
460
  unsigned int va_list_gpr_size : 8;
461
 
462
  /* Number of units of floating point registers that need saving in stdarg
463
     function.  */
464
  unsigned int va_list_fpr_size : 8;
465
};
466
 
467
/* If va_list_[gf]pr_size is set to this, it means we don't know how
468
   many units need to be saved.  */
469
#define VA_LIST_MAX_GPR_SIZE    255
470
#define VA_LIST_MAX_FPR_SIZE    255
471
 
472
/* The function currently being compiled.  */
473
extern GTY(()) struct function *cfun;
474
 
475
/* Pointer to chain of `struct function' for containing functions.  */
476
extern GTY(()) struct function *outer_function_chain;
477
 
478
/* Nonzero if we've already converted virtual regs to hard regs.  */
479
extern int virtuals_instantiated;
480
 
481
/* Nonzero if at least one trampoline has been created.  */
482
extern int trampolines_created;
483
 
484
/* For backward compatibility... eventually these should all go away.  */
485
#define current_function_pops_args (cfun->pops_args)
486
#define current_function_returns_struct (cfun->returns_struct)
487
#define current_function_returns_pcc_struct (cfun->returns_pcc_struct)
488
#define current_function_returns_pointer (cfun->returns_pointer)
489
#define current_function_calls_setjmp (cfun->calls_setjmp)
490
#define current_function_calls_alloca (cfun->calls_alloca)
491
#define current_function_accesses_prior_frames (cfun->accesses_prior_frames)
492
#define current_function_calls_eh_return (cfun->calls_eh_return)
493
#define current_function_is_thunk (cfun->is_thunk)
494
#define current_function_args_info (cfun->args_info)
495
#define current_function_args_size (cfun->args_size)
496
#define current_function_pretend_args_size (cfun->pretend_args_size)
497
#define current_function_outgoing_args_size (cfun->outgoing_args_size)
498
#define current_function_arg_offset_rtx (cfun->arg_offset_rtx)
499
#define current_function_stdarg (cfun->stdarg)
500
#define current_function_internal_arg_pointer (cfun->internal_arg_pointer)
501
#define current_function_return_rtx (cfun->return_rtx)
502
#define current_function_profile (cfun->profile)
503
#define current_function_funcdef_no (cfun->funcdef_no)
504
#define current_function_limit_stack (cfun->limit_stack)
505
#define current_function_uses_pic_offset_table (cfun->uses_pic_offset_table)
506
#define current_function_uses_const_pool (cfun->uses_const_pool)
507
#define current_function_epilogue_delay_list (cfun->epilogue_delay_list)
508
#define current_function_has_nonlocal_label (cfun->has_nonlocal_label)
509
#define current_function_has_nonlocal_goto (cfun->has_nonlocal_goto)
510
 
511
#define return_label (cfun->x_return_label)
512
#define naked_return_label (cfun->x_naked_return_label)
513
#define stack_slot_list (cfun->x_stack_slot_list)
514
#define parm_birth_insn (cfun->x_parm_birth_insn)
515
#define frame_offset (cfun->x_frame_offset)
516
#define stack_check_probe_note (cfun->x_stack_check_probe_note)
517
#define arg_pointer_save_area (cfun->x_arg_pointer_save_area)
518
#define used_temp_slots (cfun->x_used_temp_slots)
519
#define avail_temp_slots (cfun->x_avail_temp_slots)
520
#define temp_slot_level (cfun->x_temp_slot_level)
521
#define nonlocal_goto_handler_labels (cfun->x_nonlocal_goto_handler_labels)
522
 
523
/* Given a function decl for a containing function,
524
   return the `struct function' for it.  */
525
struct function *find_function_data (tree);
526
 
527
/* Identify BLOCKs referenced by more than one NOTE_INSN_BLOCK_{BEG,END},
528
   and create duplicate blocks.  */
529
extern void reorder_blocks (void);
530
 
531
/* Set BLOCK_NUMBER for all the blocks in FN.  */
532
extern void number_blocks (tree);
533
 
534
extern void clear_block_marks (tree);
535
extern tree blocks_nreverse (tree);
536
extern void reset_block_changes (void);
537
extern void record_block_change (tree);
538
extern void finalize_block_changes (void);
539
extern void check_block_change (rtx, tree *);
540
extern void free_block_changes (void);
541
 
542
/* Return size needed for stack frame based on slots so far allocated.
543
   This size counts from zero.  It is not rounded to STACK_BOUNDARY;
544
   the caller may have to do that.  */
545
extern HOST_WIDE_INT get_frame_size (void);
546
 
547
/* Issue an error message and return TRUE if frame OFFSET overflows in
548
   the signed target pointer arithmetics for function FUNC.  Otherwise
549
   return FALSE.  */
550
extern bool frame_offset_overflow (HOST_WIDE_INT, tree);
551
 
552
/* A pointer to a function to create target specific, per-function
553
   data structures.  */
554
extern struct machine_function * (*init_machine_status) (void);
555
 
556
/* Save and restore status information for a nested function.  */
557
extern void free_after_parsing (struct function *);
558
extern void free_after_compilation (struct function *);
559
 
560
extern void init_varasm_status (struct function *);
561
 
562
#ifdef RTX_CODE
563
extern void diddle_return_value (void (*)(rtx, void*), void*);
564
extern void clobber_return_register (void);
565
#endif
566
 
567
extern rtx get_arg_pointer_save_area (struct function *);
568
 
569
/* Returns the name of the current function.  */
570
extern const char *current_function_name (void);
571
 
572
extern void do_warn_unused_parameter (tree);
573
 
574
extern bool pass_by_reference (CUMULATIVE_ARGS *, enum machine_mode,
575
                               tree, bool);
576
extern bool reference_callee_copied (CUMULATIVE_ARGS *, enum machine_mode,
577
                                     tree, bool);
578
 
579
extern void used_types_insert (tree);
580
 
581
#endif  /* GCC_FUNCTION_H */

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