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1 280 jeremybenn
/* Definitions for code generation pass of GNU compiler.
2
   Copyright (C) 1987, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3
   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
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_EXPR_H
23
#define GCC_EXPR_H
24
 
25
/* For inhibit_defer_pop */
26
#include "function.h"
27
/* For XEXP, GEN_INT, rtx_code */
28
#include "rtl.h"
29
/* For optimize_size */
30
#include "flags.h"
31
/* For host_integerp, tree_low_cst, fold_convert, size_binop, ssize_int,
32
   TREE_CODE, TYPE_SIZE, int_size_in_bytes,    */
33
#include "tree.h"
34
/* For GET_MODE_BITSIZE, word_mode */
35
#include "machmode.h"
36
 
37
/* The default branch cost is 1.  */
38
#ifndef BRANCH_COST
39
#define BRANCH_COST(speed_p, predictable_p) 1
40
#endif
41
 
42
/* This is the 4th arg to `expand_expr'.
43
   EXPAND_STACK_PARM means we are possibly expanding a call param onto
44
   the stack.
45
   EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
46
   EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
47
   EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
48
    is a constant that is not a legitimate address.
49
   EXPAND_WRITE means we are only going to write to the resulting rtx.
50
   EXPAND_MEMORY means we are interested in a memory result, even if
51
    the memory is constant and we could have propagated a constant value.  */
52
enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM, EXPAND_SUM,
53
                      EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER, EXPAND_WRITE,
54
                      EXPAND_MEMORY};
55
 
56
/* Prevent the compiler from deferring stack pops.  See
57
   inhibit_defer_pop for more information.  */
58
#define NO_DEFER_POP (inhibit_defer_pop += 1)
59
 
60
/* Allow the compiler to defer stack pops.  See inhibit_defer_pop for
61
   more information.  */
62
#define OK_DEFER_POP (inhibit_defer_pop -= 1)
63
 
64
/* If a memory-to-memory move would take MOVE_RATIO or more simple
65
   move-instruction sequences, we will do a movmem or libcall instead.  */
66
 
67
#ifndef MOVE_RATIO
68
#if defined (HAVE_movmemqi) || defined (HAVE_movmemhi) || defined (HAVE_movmemsi) || defined (HAVE_movmemdi) || defined (HAVE_movmemti)
69
#define MOVE_RATIO(speed) 2
70
#else
71
/* If we are optimizing for space (-Os), cut down the default move ratio.  */
72
#define MOVE_RATIO(speed) ((speed) ? 15 : 3)
73
#endif
74
#endif
75
 
76
/* If a clear memory operation would take CLEAR_RATIO or more simple
77
   move-instruction sequences, we will do a setmem or libcall instead.  */
78
 
79
#ifndef CLEAR_RATIO
80
#if defined (HAVE_setmemqi) || defined (HAVE_setmemhi) || defined (HAVE_setmemsi) || defined (HAVE_setmemdi) || defined (HAVE_setmemti)
81
#define CLEAR_RATIO(speed) 2
82
#else
83
/* If we are optimizing for space, cut down the default clear ratio.  */
84
#define CLEAR_RATIO(speed) ((speed) ? 15 :3)
85
#endif
86
#endif
87
 
88
/* If a memory set (to value other than zero) operation would take
89
   SET_RATIO or more simple move-instruction sequences, we will do a movmem
90
   or libcall instead.  */
91
#ifndef SET_RATIO
92
#define SET_RATIO(speed) MOVE_RATIO(speed)
93
#endif
94
 
95
enum direction {none, upward, downward};
96
 
97
/* Structure to record the size of a sequence of arguments
98
   as the sum of a tree-expression and a constant.  This structure is
99
   also used to store offsets from the stack, which might be negative,
100
   so the variable part must be ssizetype, not sizetype.  */
101
 
102
struct args_size
103
{
104
  HOST_WIDE_INT constant;
105
  tree var;
106
};
107
 
108
/* Package up various arg related fields of struct args for
109
   locate_and_pad_parm.  */
110
struct locate_and_pad_arg_data
111
{
112
  /* Size of this argument on the stack, rounded up for any padding it
113
     gets.  If REG_PARM_STACK_SPACE is defined, then register parms are
114
     counted here, otherwise they aren't.  */
115
  struct args_size size;
116
  /* Offset of this argument from beginning of stack-args.  */
117
  struct args_size offset;
118
  /* Offset to the start of the stack slot.  Different from OFFSET
119
     if this arg pads downward.  */
120
  struct args_size slot_offset;
121
  /* The amount that the stack pointer needs to be adjusted to
122
     force alignment for the next argument.  */
123
  struct args_size alignment_pad;
124
  /* Which way we should pad this arg.  */
125
  enum direction where_pad;
126
  /* slot_offset is at least this aligned.  */
127
  unsigned int boundary;
128
};
129
 
130
/* Add the value of the tree INC to the `struct args_size' TO.  */
131
 
132
#define ADD_PARM_SIZE(TO, INC)                                  \
133
do {                                                            \
134
  tree inc = (INC);                                             \
135
  if (host_integerp (inc, 0))                                    \
136
    (TO).constant += tree_low_cst (inc, 0);                      \
137
  else if ((TO).var == 0)                                        \
138
    (TO).var = fold_convert (ssizetype, inc);                   \
139
  else                                                          \
140
    (TO).var = size_binop (PLUS_EXPR, (TO).var,                 \
141
                           fold_convert (ssizetype, inc));      \
142
} while (0)
143
 
144
#define SUB_PARM_SIZE(TO, DEC)                                  \
145
do {                                                            \
146
  tree dec = (DEC);                                             \
147
  if (host_integerp (dec, 0))                                    \
148
    (TO).constant -= tree_low_cst (dec, 0);                      \
149
  else if ((TO).var == 0)                                        \
150
    (TO).var = size_binop (MINUS_EXPR, ssize_int (0),            \
151
                           fold_convert (ssizetype, dec));      \
152
  else                                                          \
153
    (TO).var = size_binop (MINUS_EXPR, (TO).var,                \
154
                           fold_convert (ssizetype, dec));      \
155
} while (0)
156
 
157
/* Convert the implicit sum in a `struct args_size' into a tree
158
   of type ssizetype.  */
159
#define ARGS_SIZE_TREE(SIZE)                                    \
160
((SIZE).var == 0 ? ssize_int ((SIZE).constant)                   \
161
 : size_binop (PLUS_EXPR, fold_convert (ssizetype, (SIZE).var), \
162
               ssize_int ((SIZE).constant)))
163
 
164
/* Convert the implicit sum in a `struct args_size' into an rtx.  */
165
#define ARGS_SIZE_RTX(SIZE)                                     \
166
((SIZE).var == 0 ? GEN_INT ((SIZE).constant)                     \
167
 : expand_normal (ARGS_SIZE_TREE (SIZE)))
168
 
169
/* Supply a default definition for FUNCTION_ARG_PADDING:
170
   usually pad upward, but pad short args downward on
171
   big-endian machines.  */
172
 
173
#define DEFAULT_FUNCTION_ARG_PADDING(MODE, TYPE)                        \
174
  (! BYTES_BIG_ENDIAN                                                   \
175
   ? upward                                                             \
176
   : (((MODE) == BLKmode                                                \
177
       ? ((TYPE) && TREE_CODE (TYPE_SIZE (TYPE)) == INTEGER_CST         \
178
          && int_size_in_bytes (TYPE) < (PARM_BOUNDARY / BITS_PER_UNIT)) \
179
       : GET_MODE_BITSIZE (MODE) < PARM_BOUNDARY)                       \
180
      ? downward : upward))
181
 
182
#ifndef FUNCTION_ARG_PADDING
183
#define FUNCTION_ARG_PADDING(MODE, TYPE)        \
184
  DEFAULT_FUNCTION_ARG_PADDING ((MODE), (TYPE))
185
#endif
186
 
187
/* Supply a default definition for FUNCTION_ARG_BOUNDARY.  Normally, we let
188
   FUNCTION_ARG_PADDING, which also pads the length, handle any needed
189
   alignment.  */
190
 
191
#ifndef FUNCTION_ARG_BOUNDARY
192
#define FUNCTION_ARG_BOUNDARY(MODE, TYPE)       PARM_BOUNDARY
193
#endif
194
 
195
/* Supply a default definition of STACK_SAVEAREA_MODE for emit_stack_save.
196
   Normally move_insn, so Pmode stack pointer.  */
197
 
198
#ifndef STACK_SAVEAREA_MODE
199
#define STACK_SAVEAREA_MODE(LEVEL) Pmode
200
#endif
201
 
202
/* Supply a default definition of STACK_SIZE_MODE for
203
   allocate_dynamic_stack_space.  Normally PLUS/MINUS, so word_mode.  */
204
 
205
#ifndef STACK_SIZE_MODE
206
#define STACK_SIZE_MODE word_mode
207
#endif
208
 
209
/* Provide default values for the macros controlling stack checking.  */
210
 
211
/* The default is neither full builtin stack checking...  */
212
#ifndef STACK_CHECK_BUILTIN
213
#define STACK_CHECK_BUILTIN 0
214
#endif
215
 
216
/* ...nor static builtin stack checking.  */
217
#ifndef STACK_CHECK_STATIC_BUILTIN
218
#define STACK_CHECK_STATIC_BUILTIN 0
219
#endif
220
 
221
/* The default interval is one page (4096 bytes).  */
222
#ifndef STACK_CHECK_PROBE_INTERVAL_EXP
223
#define STACK_CHECK_PROBE_INTERVAL_EXP 12
224
#endif
225
 
226
/* The default is not to move the stack pointer.  */
227
#ifndef STACK_CHECK_MOVING_SP
228
#define STACK_CHECK_MOVING_SP 0
229
#endif
230
 
231
/* This is a kludge to try to capture the discrepancy between the old
232
   mechanism (generic stack checking) and the new mechanism (static
233
   builtin stack checking).  STACK_CHECK_PROTECT needs to be bumped
234
   for the latter because part of the protection area is effectively
235
   included in STACK_CHECK_MAX_FRAME_SIZE for the former.  */
236
#ifdef STACK_CHECK_PROTECT
237
#define STACK_OLD_CHECK_PROTECT STACK_CHECK_PROTECT
238
#else
239
#define STACK_OLD_CHECK_PROTECT \
240
 (USING_SJLJ_EXCEPTIONS ? 75 * UNITS_PER_WORD : 8 * 1024)
241
#endif
242
 
243
/* Minimum amount of stack required to recover from an anticipated stack
244
   overflow detection.  The default value conveys an estimate of the amount
245
   of stack required to propagate an exception.  */
246
#ifndef STACK_CHECK_PROTECT
247
#define STACK_CHECK_PROTECT \
248
 (USING_SJLJ_EXCEPTIONS ? 75 * UNITS_PER_WORD : 12 * 1024)
249
#endif
250
 
251
/* Make the maximum frame size be the largest we can and still only need
252
   one probe per function.  */
253
#ifndef STACK_CHECK_MAX_FRAME_SIZE
254
#define STACK_CHECK_MAX_FRAME_SIZE \
255
  ((1 << STACK_CHECK_PROBE_INTERVAL_EXP) - UNITS_PER_WORD)
256
#endif
257
 
258
/* This is arbitrary, but should be large enough everywhere.  */
259
#ifndef STACK_CHECK_FIXED_FRAME_SIZE
260
#define STACK_CHECK_FIXED_FRAME_SIZE (4 * UNITS_PER_WORD)
261
#endif
262
 
263
/* Provide a reasonable default for the maximum size of an object to
264
   allocate in the fixed frame.  We may need to be able to make this
265
   controllable by the user at some point.  */
266
#ifndef STACK_CHECK_MAX_VAR_SIZE
267
#define STACK_CHECK_MAX_VAR_SIZE (STACK_CHECK_MAX_FRAME_SIZE / 100)
268
#endif
269
 
270
/* This structure is used to pass around information about exploded
271
   unary, binary and trinary expressions between expand_expr_real_1 and
272
   friends.  */
273
typedef struct separate_ops
274
{
275
  enum tree_code code;
276
  tree type;
277
  tree op0, op1, op2;
278
  location_t location;
279
} *sepops;
280
 
281
/* Functions from optabs.c, commonly used, and without need for the optabs
282
   tables:  */
283
 
284
/* Passed to expand_simple_binop and expand_binop to say which options
285
   to try to use if the requested operation can't be open-coded on the
286
   requisite mode.  Either OPTAB_LIB or OPTAB_LIB_WIDEN says try using
287
   a library call.  Either OPTAB_WIDEN or OPTAB_LIB_WIDEN says try
288
   using a wider mode.  OPTAB_MUST_WIDEN says try widening and don't
289
   try anything else.  */
290
 
291
enum optab_methods
292
{
293
  OPTAB_DIRECT,
294
  OPTAB_LIB,
295
  OPTAB_WIDEN,
296
  OPTAB_LIB_WIDEN,
297
  OPTAB_MUST_WIDEN
298
};
299
 
300
/* Generate code for a simple binary or unary operation.  "Simple" in
301
   this case means "can be unambiguously described by a (mode, code)
302
   pair and mapped to a single optab."  */
303
extern rtx expand_simple_binop (enum machine_mode, enum rtx_code, rtx,
304
                                rtx, rtx, int, enum optab_methods);
305
extern rtx expand_simple_unop (enum machine_mode, enum rtx_code, rtx, rtx,
306
                               int);
307
 
308
/* Report whether the machine description contains an insn which can
309
   perform the operation described by CODE and MODE.  */
310
extern int have_insn_for (enum rtx_code, enum machine_mode);
311
 
312
extern rtx prepare_operand (int, rtx, int, enum machine_mode, enum machine_mode,
313
                            int);
314
 
315
/* Emit code to make a call to a constant function or a library call.  */
316
extern void emit_libcall_block (rtx, rtx, rtx, rtx);
317
 
318
/* Create but don't emit one rtl instruction to perform certain operations.
319
   Modes must match; operands must meet the operation's predicates.
320
   Likewise for subtraction and for just copying.  */
321
extern rtx gen_add2_insn (rtx, rtx);
322
extern rtx gen_add3_insn (rtx, rtx, rtx);
323
extern rtx gen_sub2_insn (rtx, rtx);
324
extern rtx gen_sub3_insn (rtx, rtx, rtx);
325
extern rtx gen_move_insn (rtx, rtx);
326
extern int have_add2_insn (rtx, rtx);
327
extern int have_sub2_insn (rtx, rtx);
328
 
329
/* Emit a pair of rtl insns to compare two rtx's and to jump
330
   to a label if the comparison is true.  */
331
extern void emit_cmp_and_jump_insns (rtx, rtx, enum rtx_code, rtx,
332
                                     enum machine_mode, int, rtx);
333
 
334
/* Generate code to indirectly jump to a location given in the rtx LOC.  */
335
extern void emit_indirect_jump (rtx);
336
 
337
/* Generate a conditional trap instruction.  */
338
extern rtx gen_cond_trap (enum rtx_code, rtx, rtx, rtx);
339
 
340
#include "insn-config.h"
341
 
342
#ifdef HAVE_conditional_move
343
/* Emit a conditional move operation.  */
344
rtx emit_conditional_move (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
345
                           rtx, rtx, enum machine_mode, int);
346
 
347
/* Return nonzero if the conditional move is supported.  */
348
int can_conditionally_move_p (enum machine_mode mode);
349
 
350
#endif
351
rtx emit_conditional_add (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
352
                          rtx, rtx, enum machine_mode, int);
353
 
354
rtx expand_val_compare_and_swap (rtx, rtx, rtx, rtx);
355
rtx expand_bool_compare_and_swap (rtx, rtx, rtx, rtx);
356
rtx expand_sync_operation (rtx, rtx, enum rtx_code);
357
rtx expand_sync_fetch_operation (rtx, rtx, enum rtx_code, bool, rtx);
358
rtx expand_sync_lock_test_and_set (rtx, rtx, rtx);
359
 
360
/* Functions from expmed.c:  */
361
 
362
/* Arguments MODE, RTX: return an rtx for the negation of that value.
363
   May emit insns.  */
364
extern rtx negate_rtx (enum machine_mode, rtx);
365
 
366
/* Expand a logical AND operation.  */
367
extern rtx expand_and (enum machine_mode, rtx, rtx, rtx);
368
 
369
/* Emit a store-flag operation.  */
370
extern rtx emit_store_flag (rtx, enum rtx_code, rtx, rtx, enum machine_mode,
371
                            int, int);
372
 
373
/* Like emit_store_flag, but always succeeds.  */
374
extern rtx emit_store_flag_force (rtx, enum rtx_code, rtx, rtx,
375
                                  enum machine_mode, int, int);
376
 
377
/* Functions from builtins.c:  */
378
extern rtx expand_builtin (tree, rtx, rtx, enum machine_mode, int);
379
extern tree std_build_builtin_va_list (void);
380
extern tree std_fn_abi_va_list (tree);
381
extern tree std_canonical_va_list_type (tree);
382
 
383
extern void std_expand_builtin_va_start (tree, rtx);
384
extern rtx default_expand_builtin (tree, rtx, rtx, enum machine_mode, int);
385
extern void expand_builtin_setjmp_setup (rtx, rtx);
386
extern void expand_builtin_setjmp_receiver (rtx);
387
extern rtx expand_builtin_saveregs (void);
388
extern void expand_builtin_trap (void);
389
extern rtx builtin_strncpy_read_str (void *, HOST_WIDE_INT, enum machine_mode);
390
 
391
/* Functions from expr.c:  */
392
 
393
/* This is run during target initialization to set up which modes can be
394
   used directly in memory and to initialize the block move optab.  */
395
extern void init_expr_target (void);
396
 
397
/* This is run at the start of compiling a function.  */
398
extern void init_expr (void);
399
 
400
/* Emit some rtl insns to move data between rtx's, converting machine modes.
401
   Both modes must be floating or both fixed.  */
402
extern void convert_move (rtx, rtx, int);
403
 
404
/* Convert an rtx to specified machine mode and return the result.  */
405
extern rtx convert_to_mode (enum machine_mode, rtx, int);
406
 
407
/* Convert an rtx to MODE from OLDMODE and return the result.  */
408
extern rtx convert_modes (enum machine_mode, enum machine_mode, rtx, int);
409
 
410
/* Emit code to move a block Y to a block X.  */
411
 
412
enum block_op_methods
413
{
414
  BLOCK_OP_NORMAL,
415
  BLOCK_OP_NO_LIBCALL,
416
  BLOCK_OP_CALL_PARM,
417
  /* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized.  */
418
  BLOCK_OP_TAILCALL
419
};
420
 
421
extern GTY(()) tree block_clear_fn;
422
extern void init_block_move_fn (const char *);
423
extern void init_block_clear_fn (const char *);
424
 
425
extern rtx emit_block_move (rtx, rtx, rtx, enum block_op_methods);
426
extern rtx emit_block_move_via_libcall (rtx, rtx, rtx, bool);
427
extern rtx emit_block_move_hints (rtx, rtx, rtx, enum block_op_methods,
428
                                  unsigned int, HOST_WIDE_INT);
429
extern bool emit_storent_insn (rtx to, rtx from);
430
 
431
/* Copy all or part of a value X into registers starting at REGNO.
432
   The number of registers to be filled is NREGS.  */
433
extern void move_block_to_reg (int, rtx, int, enum machine_mode);
434
 
435
/* Copy all or part of a BLKmode value X out of registers starting at REGNO.
436
   The number of registers to be filled is NREGS.  */
437
extern void move_block_from_reg (int, rtx, int);
438
 
439
/* Generate a non-consecutive group of registers represented by a PARALLEL.  */
440
extern rtx gen_group_rtx (rtx);
441
 
442
/* Load a BLKmode value into non-consecutive registers represented by a
443
   PARALLEL.  */
444
extern void emit_group_load (rtx, rtx, tree, int);
445
 
446
/* Similarly, but load into new temporaries.  */
447
extern rtx emit_group_load_into_temps (rtx, rtx, tree, int);
448
 
449
/* Move a non-consecutive group of registers represented by a PARALLEL into
450
   a non-consecutive group of registers represented by a PARALLEL.  */
451
extern void emit_group_move (rtx, rtx);
452
 
453
/* Move a group of registers represented by a PARALLEL into pseudos.  */
454
extern rtx emit_group_move_into_temps (rtx);
455
 
456
/* Store a BLKmode value from non-consecutive registers represented by a
457
   PARALLEL.  */
458
extern void emit_group_store (rtx, rtx, tree, int);
459
 
460
/* Copy BLKmode object from a set of registers.  */
461
extern rtx copy_blkmode_from_reg (rtx, rtx, tree);
462
 
463
/* Mark REG as holding a parameter for the next CALL_INSN.  */
464
extern void use_reg (rtx *, rtx);
465
 
466
/* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
467
   for the next CALL_INSN.  */
468
extern void use_regs (rtx *, int, int);
469
 
470
/* Mark a PARALLEL as holding a parameter for the next CALL_INSN.  */
471
extern void use_group_regs (rtx *, rtx);
472
 
473
/* Write zeros through the storage of OBJECT.
474
   If OBJECT has BLKmode, SIZE is its length in bytes.  */
475
extern rtx clear_storage (rtx, rtx, enum block_op_methods);
476
extern rtx clear_storage_hints (rtx, rtx, enum block_op_methods,
477
                                unsigned int, HOST_WIDE_INT);
478
/* The same, but always output an library call.  */
479
rtx set_storage_via_libcall (rtx, rtx, rtx, bool);
480
 
481
/* Expand a setmem pattern; return true if successful.  */
482
extern bool set_storage_via_setmem (rtx, rtx, rtx, unsigned int,
483
                                    unsigned int, HOST_WIDE_INT);
484
 
485
/* Determine whether the LEN bytes can be moved by using several move
486
   instructions.  Return nonzero if a call to move_by_pieces should
487
   succeed.  */
488
extern int can_move_by_pieces (unsigned HOST_WIDE_INT, unsigned int);
489
 
490
/* Return nonzero if it is desirable to store LEN bytes generated by
491
   CONSTFUN with several move instructions by store_by_pieces
492
   function.  CONSTFUNDATA is a pointer which will be passed as argument
493
   in every CONSTFUN call.
494
   ALIGN is maximum alignment we can assume.
495
   MEMSETP is true if this is a real memset/bzero, not a copy
496
   of a const string.  */
497
extern int can_store_by_pieces (unsigned HOST_WIDE_INT,
498
                                rtx (*) (void *, HOST_WIDE_INT,
499
                                         enum machine_mode),
500
                                void *, unsigned int, bool);
501
 
502
/* Generate several move instructions to store LEN bytes generated by
503
   CONSTFUN to block TO.  (A MEM rtx with BLKmode).  CONSTFUNDATA is a
504
   pointer which will be passed as argument in every CONSTFUN call.
505
   ALIGN is maximum alignment we can assume.
506
   MEMSETP is true if this is a real memset/bzero, not a copy.
507
   Returns TO + LEN.  */
508
extern rtx store_by_pieces (rtx, unsigned HOST_WIDE_INT,
509
                            rtx (*) (void *, HOST_WIDE_INT, enum machine_mode),
510
                            void *, unsigned int, bool, int);
511
 
512
/* Emit insns to set X from Y.  */
513
extern rtx emit_move_insn (rtx, rtx);
514
 
515
/* Emit insns to set X from Y, with no frills.  */
516
extern rtx emit_move_insn_1 (rtx, rtx);
517
 
518
extern rtx emit_move_complex_push (enum machine_mode, rtx, rtx);
519
extern rtx emit_move_complex_parts (rtx, rtx);
520
 
521
/* Push a block of length SIZE (perhaps variable)
522
   and return an rtx to address the beginning of the block.  */
523
extern rtx push_block (rtx, int, int);
524
 
525
/* Generate code to push something onto the stack, given its mode and type.  */
526
extern void emit_push_insn (rtx, enum machine_mode, tree, rtx, unsigned int,
527
                            int, rtx, int, rtx, rtx, int, rtx);
528
 
529
/* Expand an assignment that stores the value of FROM into TO.  */
530
extern void expand_assignment (tree, tree, bool);
531
 
532
/* Generate code for computing expression EXP,
533
   and storing the value into TARGET.
534
   If SUGGEST_REG is nonzero, copy the value through a register
535
   and return that register, if that is possible.  */
536
extern rtx store_expr (tree, rtx, int, bool);
537
 
538
/* Given an rtx that may include add and multiply operations,
539
   generate them as insns and return a pseudo-reg containing the value.
540
   Useful after calling expand_expr with 1 as sum_ok.  */
541
extern rtx force_operand (rtx, rtx);
542
 
543
/* Work horses for expand_expr.  */
544
extern rtx expand_expr_real (tree, rtx, enum machine_mode,
545
                             enum expand_modifier, rtx *);
546
extern rtx expand_expr_real_1 (tree, rtx, enum machine_mode,
547
                               enum expand_modifier, rtx *);
548
extern rtx expand_expr_real_2 (sepops, rtx, enum machine_mode,
549
                               enum expand_modifier);
550
 
551
/* Generate code for computing expression EXP.
552
   An rtx for the computed value is returned.  The value is never null.
553
   In the case of a void EXP, const0_rtx is returned.  */
554
static inline rtx
555
expand_expr (tree exp, rtx target, enum machine_mode mode,
556
             enum expand_modifier modifier)
557
{
558
  return expand_expr_real (exp, target, mode, modifier, NULL);
559
}
560
 
561
static inline rtx
562
expand_normal (tree exp)
563
{
564
  return expand_expr_real (exp, NULL_RTX, VOIDmode, EXPAND_NORMAL, NULL);
565
}
566
 
567
/* At the start of a function, record that we have no previously-pushed
568
   arguments waiting to be popped.  */
569
extern void init_pending_stack_adjust (void);
570
 
571
/* Discard any pending stack adjustment.  */
572
extern void discard_pending_stack_adjust (void);
573
 
574
/* When exiting from function, if safe, clear out any pending stack adjust
575
   so the adjustment won't get done.  */
576
extern void clear_pending_stack_adjust (void);
577
 
578
/* Pop any previously-pushed arguments that have not been popped yet.  */
579
extern void do_pending_stack_adjust (void);
580
 
581
/* Return the tree node and offset if a given argument corresponds to
582
   a string constant.  */
583
extern tree string_constant (tree, tree *);
584
 
585
/* Generate code to evaluate EXP and jump to LABEL if the value is zero.  */
586
extern void jumpifnot (tree, rtx, int);
587
extern void jumpifnot_1 (enum tree_code, tree, tree, rtx, int);
588
 
589
/* Generate code to evaluate EXP and jump to LABEL if the value is nonzero.  */
590
extern void jumpif (tree, rtx, int);
591
extern void jumpif_1 (enum tree_code, tree, tree, rtx, int);
592
 
593
/* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
594
   the result is zero, or IF_TRUE_LABEL if the result is one.  */
595
extern void do_jump (tree, rtx, rtx, int);
596
extern void do_jump_1 (enum tree_code, tree, tree, rtx, rtx, int);
597
 
598
extern void do_compare_rtx_and_jump (rtx, rtx, enum rtx_code, int,
599
                                     enum machine_mode, rtx, rtx, rtx, int);
600
 
601
/* Two different ways of generating switch statements.  */
602
extern int try_casesi (tree, tree, tree, tree, rtx, rtx, rtx);
603
extern int try_tablejump (tree, tree, tree, tree, rtx, rtx);
604
 
605
/* Functions from alias.c */
606
#include "alias.h"
607
 
608
 
609
/* rtl.h and tree.h were included.  */
610
/* Return an rtx for the size in bytes of the value of an expr.  */
611
extern rtx expr_size (tree);
612
 
613
/* Return a wide integer for the size in bytes of the value of EXP, or -1
614
   if the size can vary or is larger than an integer.  */
615
extern HOST_WIDE_INT int_expr_size (tree);
616
 
617
/* Return an rtx that refers to the value returned by a function
618
   in its original home.  This becomes invalid if any more code is emitted.  */
619
extern rtx hard_function_value (const_tree, const_tree, const_tree, int);
620
 
621
extern rtx prepare_call_address (tree, rtx, rtx, rtx *, int, int);
622
 
623
extern bool shift_return_value (enum machine_mode, bool, rtx);
624
 
625
extern rtx expand_call (tree, rtx, int);
626
 
627
extern void fixup_tail_calls (void);
628
 
629
#ifdef TREE_CODE
630
extern rtx expand_shift (enum tree_code, enum machine_mode, rtx, tree, rtx,
631
                         int);
632
extern rtx expand_divmod (int, enum tree_code, enum machine_mode, rtx, rtx,
633
                          rtx, int);
634
#endif
635
 
636
extern void locate_and_pad_parm (enum machine_mode, tree, int, int, tree,
637
                                 struct args_size *,
638
                                 struct locate_and_pad_arg_data *);
639
 
640
/* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary.  */
641
extern rtx label_rtx (tree);
642
 
643
/* As label_rtx, but additionally the label is placed on the forced label
644
   list of its containing function (i.e. it is treated as reachable even
645
   if how is not obvious).  */
646
extern rtx force_label_rtx (tree);
647
 
648
/* Return an rtx like arg but sans any constant terms.
649
   Returns the original rtx if it has no constant terms.
650
   The constant terms are added and stored via a second arg.  */
651
extern rtx eliminate_constant_term (rtx, rtx *);
652
 
653
/* Convert arg to a valid memory address for specified machine mode that points
654
   to a specific named address space, by emitting insns to perform arithmetic
655
   if necessary.  */
656
extern rtx memory_address_addr_space (enum machine_mode, rtx, addr_space_t);
657
 
658
/* Like memory_address_addr_space, except assume the memory address points to
659
   the generic named address space.  */
660
#define memory_address(MODE,RTX) \
661
        memory_address_addr_space ((MODE), (RTX), ADDR_SPACE_GENERIC)
662
 
663
/* Return a memory reference like MEMREF, but with its mode changed
664
   to MODE and its address changed to ADDR.
665
   (VOIDmode means don't change the mode.
666
   NULL for ADDR means don't change the address.)  */
667
extern rtx change_address (rtx, enum machine_mode, rtx);
668
 
669
/* Return a memory reference like MEMREF, but with its mode changed
670
   to MODE and its address offset by OFFSET bytes.  */
671
#define adjust_address(MEMREF, MODE, OFFSET) \
672
  adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1)
673
 
674
/* Likewise, but the reference is not required to be valid.  */
675
#define adjust_address_nv(MEMREF, MODE, OFFSET) \
676
  adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1)
677
 
678
/* Return a memory reference like MEMREF, but with its mode changed
679
   to MODE and its address changed to ADDR, which is assumed to be
680
   increased by OFFSET bytes from MEMREF.  */
681
#define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \
682
  adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1)
683
 
684
/* Likewise, but the reference is not required to be valid.  */
685
#define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \
686
  adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0)
687
 
688
extern rtx adjust_address_1 (rtx, enum machine_mode, HOST_WIDE_INT, int, int);
689
extern rtx adjust_automodify_address_1 (rtx, enum machine_mode, rtx,
690
                                        HOST_WIDE_INT, int);
691
 
692
/* Return a memory reference like MEMREF, but whose address is changed by
693
   adding OFFSET, an RTX, to it.  POW2 is the highest power of two factor
694
   known to be in OFFSET (possibly 1).  */
695
extern rtx offset_address (rtx, rtx, unsigned HOST_WIDE_INT);
696
 
697
/* Definitions from emit-rtl.c */
698
#include "emit-rtl.h"
699
 
700
/* Return a memory reference like MEMREF, but with its mode widened to
701
   MODE and adjusted by OFFSET.  */
702
extern rtx widen_memory_access (rtx, enum machine_mode, HOST_WIDE_INT);
703
 
704
/* Return a memory reference like MEMREF, but which is known to have a
705
   valid address.  */
706
extern rtx validize_mem (rtx);
707
 
708
extern rtx use_anchored_address (rtx);
709
 
710
/* Given REF, a MEM, and T, either the type of X or the expression
711
   corresponding to REF, set the memory attributes.  OBJECTP is nonzero
712
   if we are making a new object of this type.  */
713
extern void set_mem_attributes (rtx, tree, int);
714
 
715
/* Similar, except that BITPOS has not yet been applied to REF, so if
716
   we alter MEM_OFFSET according to T then we should subtract BITPOS
717
   expecting that it'll be added back in later.  */
718
extern void set_mem_attributes_minus_bitpos (rtx, tree, int, HOST_WIDE_INT);
719
 
720
/* Return OFFSET if XEXP (MEM, 0) - OFFSET is known to be ALIGN
721
   bits aligned for 0 <= OFFSET < ALIGN / BITS_PER_UNIT, or
722
   -1 if not known.  */
723
extern int get_mem_align_offset (rtx, unsigned int);
724
 
725
/* Assemble the static constant template for function entry trampolines.  */
726
extern rtx assemble_trampoline_template (void);
727
 
728
/* Copy given rtx to a new temp reg and return that.  */
729
extern rtx copy_to_reg (rtx);
730
 
731
/* Like copy_to_reg but always make the reg Pmode.  */
732
extern rtx copy_addr_to_reg (rtx);
733
 
734
/* Like copy_to_reg but always make the reg the specified mode MODE.  */
735
extern rtx copy_to_mode_reg (enum machine_mode, rtx);
736
 
737
/* Copy given rtx to given temp reg and return that.  */
738
extern rtx copy_to_suggested_reg (rtx, rtx, enum machine_mode);
739
 
740
/* Copy a value to a register if it isn't already a register.
741
   Args are mode (in case value is a constant) and the value.  */
742
extern rtx force_reg (enum machine_mode, rtx);
743
 
744
/* Return given rtx, copied into a new temp reg if it was in memory.  */
745
extern rtx force_not_mem (rtx);
746
 
747
/* Return mode and signedness to use when an argument or result in the
748
   given mode is promoted.  */
749
extern enum machine_mode promote_function_mode (const_tree, enum machine_mode, int *,
750
                                                const_tree, int);
751
 
752
/* Return mode and signedness to use when an object in the given mode
753
   is promoted.  */
754
extern enum machine_mode promote_mode (const_tree, enum machine_mode, int *);
755
 
756
/* Return mode and signedness to use when object is promoted.  */
757
enum machine_mode promote_decl_mode (const_tree, int *);
758
 
759
/* Remove some bytes from the stack.  An rtx says how many.  */
760
extern void adjust_stack (rtx);
761
 
762
/* Add some bytes to the stack.  An rtx says how many.  */
763
extern void anti_adjust_stack (rtx);
764
 
765
/* Add some bytes to the stack while probing it.  An rtx says how many. */
766
extern void anti_adjust_stack_and_probe (rtx, bool);
767
 
768
/* This enum is used for the following two functions.  */
769
enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};
770
 
771
/* Save the stack pointer at the specified level.  */
772
extern void emit_stack_save (enum save_level, rtx *, rtx);
773
 
774
/* Restore the stack pointer from a save area of the specified level.  */
775
extern void emit_stack_restore (enum save_level, rtx, rtx);
776
 
777
/* Invoke emit_stack_save for the nonlocal_goto_save_area.  */
778
extern void update_nonlocal_goto_save_area (void);
779
 
780
/* Allocate some space on the stack dynamically and return its address.  An rtx
781
   says how many bytes.  */
782
extern rtx allocate_dynamic_stack_space (rtx, rtx, int);
783
 
784
/* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
785
   FIRST is a constant and size is a Pmode RTX.  These are offsets from
786
   the current stack pointer.  STACK_GROWS_DOWNWARD says whether to add
787
   or subtract them from the stack pointer.  */
788
extern void probe_stack_range (HOST_WIDE_INT, rtx);
789
 
790
/* Return an rtx that refers to the value returned by a library call
791
   in its original home.  This becomes invalid if any more code is emitted.  */
792
extern rtx hard_libcall_value (enum machine_mode, rtx);
793
 
794
/* Return the mode desired by operand N of a particular bitfield
795
   insert/extract insn, or MAX_MACHINE_MODE if no such insn is
796
   available.  */
797
 
798
enum extraction_pattern { EP_insv, EP_extv, EP_extzv };
799
extern enum machine_mode
800
mode_for_extraction (enum extraction_pattern, int);
801
 
802
extern void store_bit_field (rtx, unsigned HOST_WIDE_INT,
803
                             unsigned HOST_WIDE_INT, enum machine_mode, rtx);
804
extern rtx extract_bit_field (rtx, unsigned HOST_WIDE_INT,
805
                              unsigned HOST_WIDE_INT, int, rtx,
806
                              enum machine_mode, enum machine_mode);
807
extern rtx extract_low_bits (enum machine_mode, enum machine_mode, rtx);
808
extern rtx expand_mult (enum machine_mode, rtx, rtx, rtx, int);
809
extern rtx expand_mult_highpart_adjust (enum machine_mode, rtx, rtx, rtx, rtx, int);
810
 
811
extern rtx assemble_static_space (unsigned HOST_WIDE_INT);
812
extern int safe_from_p (const_rtx, tree, int);
813
extern bool split_comparison (enum rtx_code, enum machine_mode,
814
                              enum rtx_code *, enum rtx_code *);
815
 
816
/* Call this once to initialize the contents of the optabs
817
   appropriately for the current target machine.  */
818
extern void init_optabs (void);
819
extern void init_all_optabs (void);
820
 
821
/* Call this to initialize an optab function entry.  */
822
extern rtx init_one_libfunc (const char *);
823
extern rtx set_user_assembler_libfunc (const char *, const char *);
824
 
825
/* Build a decl for a libfunc named NAME. */
826
extern tree build_libfunc_function (const char *);
827
 
828
/* Get the personality libfunc for a function decl.  */
829
rtx get_personality_function (tree);
830
 
831
extern int vector_mode_valid_p (enum machine_mode);
832
 
833
#endif /* GCC_EXPR_H */

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