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Commit | Line | Data |
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5e6908ea | 1 | /* Expands front end tree to back end RTL for GCC. |
23a5b65a | 2 | Copyright (C) 1987-2014 Free Software Foundation, Inc. |
6f086dfc | 3 | |
1322177d | 4 | This file is part of GCC. |
6f086dfc | 5 | |
1322177d LB |
6 | GCC is free software; you can redistribute it and/or modify it under |
7 | the terms of the GNU General Public License as published by the Free | |
9dcd6f09 | 8 | Software Foundation; either version 3, or (at your option) any later |
1322177d | 9 | version. |
6f086dfc | 10 | |
1322177d LB |
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
6f086dfc RS |
15 | |
16 | You should have received a copy of the GNU General Public License | |
9dcd6f09 NC |
17 | along with GCC; see the file COPYING3. If not see |
18 | <http://www.gnu.org/licenses/>. */ | |
6f086dfc | 19 | |
6f086dfc RS |
20 | /* This file handles the generation of rtl code from tree structure |
21 | at the level of the function as a whole. | |
22 | It creates the rtl expressions for parameters and auto variables | |
23 | and has full responsibility for allocating stack slots. | |
24 | ||
25 | `expand_function_start' is called at the beginning of a function, | |
26 | before the function body is parsed, and `expand_function_end' is | |
27 | called after parsing the body. | |
28 | ||
29 | Call `assign_stack_local' to allocate a stack slot for a local variable. | |
30 | This is usually done during the RTL generation for the function body, | |
31 | but it can also be done in the reload pass when a pseudo-register does | |
8fff4fc1 | 32 | not get a hard register. */ |
6f086dfc RS |
33 | |
34 | #include "config.h" | |
670ee920 | 35 | #include "system.h" |
4977bab6 ZW |
36 | #include "coretypes.h" |
37 | #include "tm.h" | |
0cbd9993 | 38 | #include "rtl-error.h" |
6f086dfc | 39 | #include "tree.h" |
d8a2d370 DN |
40 | #include "stor-layout.h" |
41 | #include "varasm.h" | |
42 | #include "stringpool.h" | |
6f086dfc | 43 | #include "flags.h" |
1ef08c63 | 44 | #include "except.h" |
83685514 AM |
45 | #include "hashtab.h" |
46 | #include "hash-set.h" | |
47 | #include "vec.h" | |
48 | #include "machmode.h" | |
49 | #include "hard-reg-set.h" | |
50 | #include "input.h" | |
6f086dfc | 51 | #include "function.h" |
6f086dfc | 52 | #include "expr.h" |
c6b97fac | 53 | #include "optabs.h" |
e78d8e51 | 54 | #include "libfuncs.h" |
6f086dfc | 55 | #include "regs.h" |
6f086dfc RS |
56 | #include "insn-config.h" |
57 | #include "recog.h" | |
58 | #include "output.h" | |
b1474bb7 | 59 | #include "tm_p.h" |
7afff7cf | 60 | #include "langhooks.h" |
61f71b34 | 61 | #include "target.h" |
677f3fa8 | 62 | #include "common/common-target.h" |
2fb9a547 | 63 | #include "gimple-expr.h" |
45b0be94 | 64 | #include "gimplify.h" |
ef330312 | 65 | #include "tree-pass.h" |
7d69de61 | 66 | #include "predict.h" |
60393bbc AM |
67 | #include "dominance.h" |
68 | #include "cfg.h" | |
69 | #include "cfgrtl.h" | |
70 | #include "cfganal.h" | |
71 | #include "cfgbuild.h" | |
72 | #include "cfgcleanup.h" | |
73 | #include "basic-block.h" | |
6fb5fa3c | 74 | #include "df.h" |
ffe14686 AM |
75 | #include "params.h" |
76 | #include "bb-reorder.h" | |
f30e25a3 | 77 | #include "shrink-wrap.h" |
b9b5f433 | 78 | #include "toplev.h" |
b8704801 | 79 | #include "rtl-iter.h" |
7d69de61 | 80 | |
5576d6f2 TT |
81 | /* So we can assign to cfun in this file. */ |
82 | #undef cfun | |
83 | ||
95f3f59e JDA |
84 | #ifndef STACK_ALIGNMENT_NEEDED |
85 | #define STACK_ALIGNMENT_NEEDED 1 | |
86 | #endif | |
87 | ||
975f3818 RS |
88 | #define STACK_BYTES (STACK_BOUNDARY / BITS_PER_UNIT) |
89 | ||
6f086dfc RS |
90 | /* Round a value to the lowest integer less than it that is a multiple of |
91 | the required alignment. Avoid using division in case the value is | |
92 | negative. Assume the alignment is a power of two. */ | |
93 | #define FLOOR_ROUND(VALUE,ALIGN) ((VALUE) & ~((ALIGN) - 1)) | |
94 | ||
95 | /* Similar, but round to the next highest integer that meets the | |
96 | alignment. */ | |
97 | #define CEIL_ROUND(VALUE,ALIGN) (((VALUE) + (ALIGN) - 1) & ~((ALIGN)- 1)) | |
98 | ||
6f086dfc | 99 | /* Nonzero once virtual register instantiation has been done. |
c39ada04 DD |
100 | assign_stack_local uses frame_pointer_rtx when this is nonzero. |
101 | calls.c:emit_library_call_value_1 uses it to set up | |
102 | post-instantiation libcalls. */ | |
103 | int virtuals_instantiated; | |
6f086dfc | 104 | |
df696a75 | 105 | /* Assign unique numbers to labels generated for profiling, debugging, etc. */ |
17211ab5 | 106 | static GTY(()) int funcdef_no; |
f6f315fe | 107 | |
414c4dc4 NC |
108 | /* These variables hold pointers to functions to create and destroy |
109 | target specific, per-function data structures. */ | |
fa8db1f7 | 110 | struct machine_function * (*init_machine_status) (void); |
46766466 | 111 | |
b384405b | 112 | /* The currently compiled function. */ |
01d939e8 | 113 | struct function *cfun = 0; |
b384405b | 114 | |
cd9c1ca8 RH |
115 | /* These hashes record the prologue and epilogue insns. */ |
116 | static GTY((if_marked ("ggc_marked_p"), param_is (struct rtx_def))) | |
117 | htab_t prologue_insn_hash; | |
118 | static GTY((if_marked ("ggc_marked_p"), param_is (struct rtx_def))) | |
119 | htab_t epilogue_insn_hash; | |
6f086dfc | 120 | \f |
b646ba3f | 121 | |
2a22f99c | 122 | hash_table<used_type_hasher> *types_used_by_vars_hash = NULL; |
9771b263 | 123 | vec<tree, va_gc> *types_used_by_cur_var_decl; |
b646ba3f | 124 | |
e15679f8 RK |
125 | /* Forward declarations. */ |
126 | ||
fa8db1f7 | 127 | static struct temp_slot *find_temp_slot_from_address (rtx); |
fa8db1f7 | 128 | static void pad_to_arg_alignment (struct args_size *, int, struct args_size *); |
ef4bddc2 | 129 | static void pad_below (struct args_size *, machine_mode, tree); |
691fe203 | 130 | static void reorder_blocks_1 (rtx_insn *, tree, vec<tree> *); |
fa8db1f7 AJ |
131 | static int all_blocks (tree, tree *); |
132 | static tree *get_block_vector (tree, int *); | |
133 | extern tree debug_find_var_in_block_tree (tree, tree); | |
1f52178b | 134 | /* We always define `record_insns' even if it's not used so that we |
ec97b83a | 135 | can always export `prologue_epilogue_contains'. */ |
dc01c3d1 | 136 | static void record_insns (rtx_insn *, rtx, htab_t *) ATTRIBUTE_UNUSED; |
cd9c1ca8 | 137 | static bool contains (const_rtx, htab_t); |
db2960f4 | 138 | static void prepare_function_start (void); |
fa8db1f7 AJ |
139 | static void do_clobber_return_reg (rtx, void *); |
140 | static void do_use_return_reg (rtx, void *); | |
c20bf1f3 | 141 | \f |
936fc9ba JH |
142 | /* Stack of nested functions. */ |
143 | /* Keep track of the cfun stack. */ | |
e5e809f4 | 144 | |
936fc9ba | 145 | typedef struct function *function_p; |
e5e809f4 | 146 | |
9771b263 | 147 | static vec<function_p> function_context_stack; |
6f086dfc RS |
148 | |
149 | /* Save the current context for compilation of a nested function. | |
d2784db4 | 150 | This is called from language-specific code. */ |
6f086dfc RS |
151 | |
152 | void | |
d2784db4 | 153 | push_function_context (void) |
6f086dfc | 154 | { |
01d939e8 | 155 | if (cfun == 0) |
182e0d71 | 156 | allocate_struct_function (NULL, false); |
b384405b | 157 | |
9771b263 | 158 | function_context_stack.safe_push (cfun); |
db2960f4 | 159 | set_cfun (NULL); |
6f086dfc RS |
160 | } |
161 | ||
162 | /* Restore the last saved context, at the end of a nested function. | |
163 | This function is called from language-specific code. */ | |
164 | ||
165 | void | |
d2784db4 | 166 | pop_function_context (void) |
6f086dfc | 167 | { |
9771b263 | 168 | struct function *p = function_context_stack.pop (); |
db2960f4 | 169 | set_cfun (p); |
6f086dfc | 170 | current_function_decl = p->decl; |
6f086dfc | 171 | |
6f086dfc | 172 | /* Reset variables that have known state during rtx generation. */ |
6f086dfc | 173 | virtuals_instantiated = 0; |
1b3d8f8a | 174 | generating_concat_p = 1; |
6f086dfc | 175 | } |
e4a4639e | 176 | |
fa51b01b RH |
177 | /* Clear out all parts of the state in F that can safely be discarded |
178 | after the function has been parsed, but not compiled, to let | |
179 | garbage collection reclaim the memory. */ | |
180 | ||
181 | void | |
fa8db1f7 | 182 | free_after_parsing (struct function *f) |
fa51b01b | 183 | { |
e8924938 | 184 | f->language = 0; |
fa51b01b RH |
185 | } |
186 | ||
e2ecd91c BS |
187 | /* Clear out all parts of the state in F that can safely be discarded |
188 | after the function has been compiled, to let garbage collection | |
0a8a198c | 189 | reclaim the memory. */ |
21cd906e | 190 | |
e2ecd91c | 191 | void |
fa8db1f7 | 192 | free_after_compilation (struct function *f) |
e2ecd91c | 193 | { |
cd9c1ca8 RH |
194 | prologue_insn_hash = NULL; |
195 | epilogue_insn_hash = NULL; | |
196 | ||
04695783 | 197 | free (crtl->emit.regno_pointer_align); |
f995dcfe | 198 | |
3e029763 | 199 | memset (crtl, 0, sizeof (struct rtl_data)); |
e2500fed | 200 | f->eh = NULL; |
e2500fed | 201 | f->machine = NULL; |
997de8ed | 202 | f->cfg = NULL; |
fa51b01b | 203 | |
57b9e367 | 204 | regno_reg_rtx = NULL; |
e2ecd91c | 205 | } |
6f086dfc | 206 | \f |
49ad7cfa BS |
207 | /* Return size needed for stack frame based on slots so far allocated. |
208 | This size counts from zero. It is not rounded to PREFERRED_STACK_BOUNDARY; | |
209 | the caller may have to do that. */ | |
9fb798d7 | 210 | |
49ad7cfa | 211 | HOST_WIDE_INT |
fa8db1f7 | 212 | get_frame_size (void) |
49ad7cfa | 213 | { |
bd60bab2 JH |
214 | if (FRAME_GROWS_DOWNWARD) |
215 | return -frame_offset; | |
216 | else | |
217 | return frame_offset; | |
49ad7cfa BS |
218 | } |
219 | ||
9fb798d7 EB |
220 | /* Issue an error message and return TRUE if frame OFFSET overflows in |
221 | the signed target pointer arithmetics for function FUNC. Otherwise | |
222 | return FALSE. */ | |
223 | ||
224 | bool | |
225 | frame_offset_overflow (HOST_WIDE_INT offset, tree func) | |
b8698a0f | 226 | { |
9fb798d7 EB |
227 | unsigned HOST_WIDE_INT size = FRAME_GROWS_DOWNWARD ? -offset : offset; |
228 | ||
229 | if (size > ((unsigned HOST_WIDE_INT) 1 << (GET_MODE_BITSIZE (Pmode) - 1)) | |
230 | /* Leave room for the fixed part of the frame. */ | |
231 | - 64 * UNITS_PER_WORD) | |
232 | { | |
c5d75364 MLI |
233 | error_at (DECL_SOURCE_LOCATION (func), |
234 | "total size of local objects too large"); | |
9fb798d7 EB |
235 | return TRUE; |
236 | } | |
237 | ||
238 | return FALSE; | |
239 | } | |
240 | ||
76fe54f0 L |
241 | /* Return stack slot alignment in bits for TYPE and MODE. */ |
242 | ||
243 | static unsigned int | |
ef4bddc2 | 244 | get_stack_local_alignment (tree type, machine_mode mode) |
76fe54f0 L |
245 | { |
246 | unsigned int alignment; | |
247 | ||
248 | if (mode == BLKmode) | |
249 | alignment = BIGGEST_ALIGNMENT; | |
250 | else | |
251 | alignment = GET_MODE_ALIGNMENT (mode); | |
252 | ||
253 | /* Allow the frond-end to (possibly) increase the alignment of this | |
254 | stack slot. */ | |
255 | if (! type) | |
256 | type = lang_hooks.types.type_for_mode (mode, 0); | |
257 | ||
258 | return STACK_SLOT_ALIGNMENT (type, mode, alignment); | |
259 | } | |
260 | ||
56731d64 BS |
261 | /* Determine whether it is possible to fit a stack slot of size SIZE and |
262 | alignment ALIGNMENT into an area in the stack frame that starts at | |
263 | frame offset START and has a length of LENGTH. If so, store the frame | |
264 | offset to be used for the stack slot in *POFFSET and return true; | |
265 | return false otherwise. This function will extend the frame size when | |
266 | given a start/length pair that lies at the end of the frame. */ | |
267 | ||
268 | static bool | |
269 | try_fit_stack_local (HOST_WIDE_INT start, HOST_WIDE_INT length, | |
270 | HOST_WIDE_INT size, unsigned int alignment, | |
271 | HOST_WIDE_INT *poffset) | |
272 | { | |
273 | HOST_WIDE_INT this_frame_offset; | |
274 | int frame_off, frame_alignment, frame_phase; | |
275 | ||
276 | /* Calculate how many bytes the start of local variables is off from | |
277 | stack alignment. */ | |
278 | frame_alignment = PREFERRED_STACK_BOUNDARY / BITS_PER_UNIT; | |
279 | frame_off = STARTING_FRAME_OFFSET % frame_alignment; | |
280 | frame_phase = frame_off ? frame_alignment - frame_off : 0; | |
281 | ||
282 | /* Round the frame offset to the specified alignment. */ | |
283 | ||
284 | /* We must be careful here, since FRAME_OFFSET might be negative and | |
285 | division with a negative dividend isn't as well defined as we might | |
286 | like. So we instead assume that ALIGNMENT is a power of two and | |
287 | use logical operations which are unambiguous. */ | |
288 | if (FRAME_GROWS_DOWNWARD) | |
289 | this_frame_offset | |
290 | = (FLOOR_ROUND (start + length - size - frame_phase, | |
291 | (unsigned HOST_WIDE_INT) alignment) | |
292 | + frame_phase); | |
293 | else | |
294 | this_frame_offset | |
295 | = (CEIL_ROUND (start - frame_phase, | |
296 | (unsigned HOST_WIDE_INT) alignment) | |
297 | + frame_phase); | |
298 | ||
299 | /* See if it fits. If this space is at the edge of the frame, | |
300 | consider extending the frame to make it fit. Our caller relies on | |
301 | this when allocating a new slot. */ | |
302 | if (frame_offset == start && this_frame_offset < frame_offset) | |
303 | frame_offset = this_frame_offset; | |
304 | else if (this_frame_offset < start) | |
305 | return false; | |
306 | else if (start + length == frame_offset | |
307 | && this_frame_offset + size > start + length) | |
308 | frame_offset = this_frame_offset + size; | |
309 | else if (this_frame_offset + size > start + length) | |
310 | return false; | |
311 | ||
312 | *poffset = this_frame_offset; | |
313 | return true; | |
314 | } | |
315 | ||
316 | /* Create a new frame_space structure describing free space in the stack | |
317 | frame beginning at START and ending at END, and chain it into the | |
318 | function's frame_space_list. */ | |
319 | ||
320 | static void | |
321 | add_frame_space (HOST_WIDE_INT start, HOST_WIDE_INT end) | |
322 | { | |
766090c2 | 323 | struct frame_space *space = ggc_alloc<frame_space> (); |
56731d64 BS |
324 | space->next = crtl->frame_space_list; |
325 | crtl->frame_space_list = space; | |
326 | space->start = start; | |
327 | space->length = end - start; | |
328 | } | |
329 | ||
6f086dfc RS |
330 | /* Allocate a stack slot of SIZE bytes and return a MEM rtx for it |
331 | with machine mode MODE. | |
718fe406 | 332 | |
6f086dfc RS |
333 | ALIGN controls the amount of alignment for the address of the slot: |
334 | 0 means according to MODE, | |
335 | -1 means use BIGGEST_ALIGNMENT and round size to multiple of that, | |
cfa29a4c | 336 | -2 means use BITS_PER_UNIT, |
6f086dfc RS |
337 | positive specifies alignment boundary in bits. |
338 | ||
80a832cd JJ |
339 | KIND has ASLK_REDUCE_ALIGN bit set if it is OK to reduce |
340 | alignment and ASLK_RECORD_PAD bit set if we should remember | |
341 | extra space we allocated for alignment purposes. When we are | |
342 | called from assign_stack_temp_for_type, it is not set so we don't | |
343 | track the same stack slot in two independent lists. | |
2e3f842f | 344 | |
bd60bab2 | 345 | We do not round to stack_boundary here. */ |
6f086dfc | 346 | |
bd60bab2 | 347 | rtx |
ef4bddc2 | 348 | assign_stack_local_1 (machine_mode mode, HOST_WIDE_INT size, |
80a832cd | 349 | int align, int kind) |
6f086dfc | 350 | { |
b3694847 | 351 | rtx x, addr; |
6f086dfc | 352 | int bigend_correction = 0; |
427188d5 | 353 | HOST_WIDE_INT slot_offset = 0, old_frame_offset; |
76fe54f0 | 354 | unsigned int alignment, alignment_in_bits; |
6f086dfc RS |
355 | |
356 | if (align == 0) | |
357 | { | |
76fe54f0 | 358 | alignment = get_stack_local_alignment (NULL, mode); |
d16790f2 | 359 | alignment /= BITS_PER_UNIT; |
6f086dfc RS |
360 | } |
361 | else if (align == -1) | |
362 | { | |
363 | alignment = BIGGEST_ALIGNMENT / BITS_PER_UNIT; | |
364 | size = CEIL_ROUND (size, alignment); | |
365 | } | |
cfa29a4c EB |
366 | else if (align == -2) |
367 | alignment = 1; /* BITS_PER_UNIT / BITS_PER_UNIT */ | |
6f086dfc RS |
368 | else |
369 | alignment = align / BITS_PER_UNIT; | |
370 | ||
2e3f842f L |
371 | alignment_in_bits = alignment * BITS_PER_UNIT; |
372 | ||
2e3f842f L |
373 | /* Ignore alignment if it exceeds MAX_SUPPORTED_STACK_ALIGNMENT. */ |
374 | if (alignment_in_bits > MAX_SUPPORTED_STACK_ALIGNMENT) | |
375 | { | |
376 | alignment_in_bits = MAX_SUPPORTED_STACK_ALIGNMENT; | |
377 | alignment = alignment_in_bits / BITS_PER_UNIT; | |
378 | } | |
a0871656 | 379 | |
2e3f842f L |
380 | if (SUPPORTS_STACK_ALIGNMENT) |
381 | { | |
382 | if (crtl->stack_alignment_estimated < alignment_in_bits) | |
383 | { | |
384 | if (!crtl->stack_realign_processed) | |
385 | crtl->stack_alignment_estimated = alignment_in_bits; | |
386 | else | |
387 | { | |
388 | /* If stack is realigned and stack alignment value | |
389 | hasn't been finalized, it is OK not to increase | |
390 | stack_alignment_estimated. The bigger alignment | |
391 | requirement is recorded in stack_alignment_needed | |
392 | below. */ | |
393 | gcc_assert (!crtl->stack_realign_finalized); | |
394 | if (!crtl->stack_realign_needed) | |
395 | { | |
396 | /* It is OK to reduce the alignment as long as the | |
397 | requested size is 0 or the estimated stack | |
398 | alignment >= mode alignment. */ | |
80a832cd | 399 | gcc_assert ((kind & ASLK_REDUCE_ALIGN) |
2e3f842f L |
400 | || size == 0 |
401 | || (crtl->stack_alignment_estimated | |
402 | >= GET_MODE_ALIGNMENT (mode))); | |
403 | alignment_in_bits = crtl->stack_alignment_estimated; | |
404 | alignment = alignment_in_bits / BITS_PER_UNIT; | |
405 | } | |
406 | } | |
407 | } | |
408 | } | |
76fe54f0 L |
409 | |
410 | if (crtl->stack_alignment_needed < alignment_in_bits) | |
411 | crtl->stack_alignment_needed = alignment_in_bits; | |
f85882d8 JY |
412 | if (crtl->max_used_stack_slot_alignment < alignment_in_bits) |
413 | crtl->max_used_stack_slot_alignment = alignment_in_bits; | |
a0871656 | 414 | |
56731d64 BS |
415 | if (mode != BLKmode || size != 0) |
416 | { | |
80a832cd | 417 | if (kind & ASLK_RECORD_PAD) |
56731d64 | 418 | { |
80a832cd JJ |
419 | struct frame_space **psp; |
420 | ||
421 | for (psp = &crtl->frame_space_list; *psp; psp = &(*psp)->next) | |
422 | { | |
423 | struct frame_space *space = *psp; | |
424 | if (!try_fit_stack_local (space->start, space->length, size, | |
425 | alignment, &slot_offset)) | |
426 | continue; | |
427 | *psp = space->next; | |
428 | if (slot_offset > space->start) | |
429 | add_frame_space (space->start, slot_offset); | |
430 | if (slot_offset + size < space->start + space->length) | |
431 | add_frame_space (slot_offset + size, | |
432 | space->start + space->length); | |
433 | goto found_space; | |
434 | } | |
56731d64 BS |
435 | } |
436 | } | |
437 | else if (!STACK_ALIGNMENT_NEEDED) | |
438 | { | |
439 | slot_offset = frame_offset; | |
440 | goto found_space; | |
441 | } | |
442 | ||
443 | old_frame_offset = frame_offset; | |
444 | ||
445 | if (FRAME_GROWS_DOWNWARD) | |
446 | { | |
447 | frame_offset -= size; | |
448 | try_fit_stack_local (frame_offset, size, size, alignment, &slot_offset); | |
58dbcf05 | 449 | |
80a832cd JJ |
450 | if (kind & ASLK_RECORD_PAD) |
451 | { | |
452 | if (slot_offset > frame_offset) | |
453 | add_frame_space (frame_offset, slot_offset); | |
454 | if (slot_offset + size < old_frame_offset) | |
455 | add_frame_space (slot_offset + size, old_frame_offset); | |
456 | } | |
56731d64 BS |
457 | } |
458 | else | |
95f3f59e | 459 | { |
56731d64 BS |
460 | frame_offset += size; |
461 | try_fit_stack_local (old_frame_offset, size, size, alignment, &slot_offset); | |
462 | ||
80a832cd JJ |
463 | if (kind & ASLK_RECORD_PAD) |
464 | { | |
465 | if (slot_offset > old_frame_offset) | |
466 | add_frame_space (old_frame_offset, slot_offset); | |
467 | if (slot_offset + size < frame_offset) | |
468 | add_frame_space (slot_offset + size, frame_offset); | |
469 | } | |
95f3f59e | 470 | } |
6f086dfc | 471 | |
56731d64 | 472 | found_space: |
6f086dfc RS |
473 | /* On a big-endian machine, if we are allocating more space than we will use, |
474 | use the least significant bytes of those that are allocated. */ | |
d70eadf7 | 475 | if (BYTES_BIG_ENDIAN && mode != BLKmode && GET_MODE_SIZE (mode) < size) |
6f086dfc | 476 | bigend_correction = size - GET_MODE_SIZE (mode); |
6f086dfc | 477 | |
6f086dfc RS |
478 | /* If we have already instantiated virtual registers, return the actual |
479 | address relative to the frame pointer. */ | |
bd60bab2 | 480 | if (virtuals_instantiated) |
0a81f074 | 481 | addr = plus_constant (Pmode, frame_pointer_rtx, |
c41536f5 | 482 | trunc_int_for_mode |
56731d64 | 483 | (slot_offset + bigend_correction |
c41536f5 | 484 | + STARTING_FRAME_OFFSET, Pmode)); |
6f086dfc | 485 | else |
0a81f074 | 486 | addr = plus_constant (Pmode, virtual_stack_vars_rtx, |
c41536f5 | 487 | trunc_int_for_mode |
56731d64 | 488 | (slot_offset + bigend_correction, |
c41536f5 | 489 | Pmode)); |
6f086dfc | 490 | |
38a448ca | 491 | x = gen_rtx_MEM (mode, addr); |
76fe54f0 | 492 | set_mem_align (x, alignment_in_bits); |
be0c514c | 493 | MEM_NOTRAP_P (x) = 1; |
6f086dfc | 494 | |
bd60bab2 JH |
495 | stack_slot_list |
496 | = gen_rtx_EXPR_LIST (VOIDmode, x, stack_slot_list); | |
e2ecd91c | 497 | |
bd60bab2 JH |
498 | if (frame_offset_overflow (frame_offset, current_function_decl)) |
499 | frame_offset = 0; | |
9070115b | 500 | |
6f086dfc RS |
501 | return x; |
502 | } | |
2e3f842f L |
503 | |
504 | /* Wrap up assign_stack_local_1 with last parameter as false. */ | |
505 | ||
506 | rtx | |
ef4bddc2 | 507 | assign_stack_local (machine_mode mode, HOST_WIDE_INT size, int align) |
2e3f842f | 508 | { |
80a832cd | 509 | return assign_stack_local_1 (mode, size, align, ASLK_RECORD_PAD); |
2e3f842f | 510 | } |
0aea6467 | 511 | \f |
fb0703f7 SB |
512 | /* In order to evaluate some expressions, such as function calls returning |
513 | structures in memory, we need to temporarily allocate stack locations. | |
514 | We record each allocated temporary in the following structure. | |
515 | ||
516 | Associated with each temporary slot is a nesting level. When we pop up | |
517 | one level, all temporaries associated with the previous level are freed. | |
518 | Normally, all temporaries are freed after the execution of the statement | |
519 | in which they were created. However, if we are inside a ({...}) grouping, | |
520 | the result may be in a temporary and hence must be preserved. If the | |
521 | result could be in a temporary, we preserve it if we can determine which | |
522 | one it is in. If we cannot determine which temporary may contain the | |
523 | result, all temporaries are preserved. A temporary is preserved by | |
9474e8ab | 524 | pretending it was allocated at the previous nesting level. */ |
fb0703f7 | 525 | |
d1b38208 | 526 | struct GTY(()) temp_slot { |
fb0703f7 SB |
527 | /* Points to next temporary slot. */ |
528 | struct temp_slot *next; | |
529 | /* Points to previous temporary slot. */ | |
530 | struct temp_slot *prev; | |
531 | /* The rtx to used to reference the slot. */ | |
532 | rtx slot; | |
fb0703f7 SB |
533 | /* The size, in units, of the slot. */ |
534 | HOST_WIDE_INT size; | |
535 | /* The type of the object in the slot, or zero if it doesn't correspond | |
536 | to a type. We use this to determine whether a slot can be reused. | |
537 | It can be reused if objects of the type of the new slot will always | |
538 | conflict with objects of the type of the old slot. */ | |
539 | tree type; | |
8f5929e1 JJ |
540 | /* The alignment (in bits) of the slot. */ |
541 | unsigned int align; | |
fb0703f7 SB |
542 | /* Nonzero if this temporary is currently in use. */ |
543 | char in_use; | |
fb0703f7 SB |
544 | /* Nesting level at which this slot is being used. */ |
545 | int level; | |
fb0703f7 SB |
546 | /* The offset of the slot from the frame_pointer, including extra space |
547 | for alignment. This info is for combine_temp_slots. */ | |
548 | HOST_WIDE_INT base_offset; | |
549 | /* The size of the slot, including extra space for alignment. This | |
550 | info is for combine_temp_slots. */ | |
551 | HOST_WIDE_INT full_size; | |
552 | }; | |
553 | ||
2a22f99c TS |
554 | /* Entry for the below hash table. */ |
555 | struct GTY((for_user)) temp_slot_address_entry { | |
fb0703f7 SB |
556 | hashval_t hash; |
557 | rtx address; | |
558 | struct temp_slot *temp_slot; | |
559 | }; | |
560 | ||
2a22f99c TS |
561 | struct temp_address_hasher : ggc_hasher<temp_slot_address_entry *> |
562 | { | |
563 | static hashval_t hash (temp_slot_address_entry *); | |
564 | static bool equal (temp_slot_address_entry *, temp_slot_address_entry *); | |
565 | }; | |
566 | ||
567 | /* A table of addresses that represent a stack slot. The table is a mapping | |
568 | from address RTXen to a temp slot. */ | |
569 | static GTY(()) hash_table<temp_address_hasher> *temp_slot_address_table; | |
570 | static size_t n_temp_slots_in_use; | |
571 | ||
0aea6467 ZD |
572 | /* Removes temporary slot TEMP from LIST. */ |
573 | ||
574 | static void | |
575 | cut_slot_from_list (struct temp_slot *temp, struct temp_slot **list) | |
576 | { | |
577 | if (temp->next) | |
578 | temp->next->prev = temp->prev; | |
579 | if (temp->prev) | |
580 | temp->prev->next = temp->next; | |
581 | else | |
582 | *list = temp->next; | |
583 | ||
584 | temp->prev = temp->next = NULL; | |
585 | } | |
586 | ||
587 | /* Inserts temporary slot TEMP to LIST. */ | |
588 | ||
589 | static void | |
590 | insert_slot_to_list (struct temp_slot *temp, struct temp_slot **list) | |
591 | { | |
592 | temp->next = *list; | |
593 | if (*list) | |
594 | (*list)->prev = temp; | |
595 | temp->prev = NULL; | |
596 | *list = temp; | |
597 | } | |
598 | ||
599 | /* Returns the list of used temp slots at LEVEL. */ | |
600 | ||
601 | static struct temp_slot ** | |
602 | temp_slots_at_level (int level) | |
603 | { | |
9771b263 DN |
604 | if (level >= (int) vec_safe_length (used_temp_slots)) |
605 | vec_safe_grow_cleared (used_temp_slots, level + 1); | |
0aea6467 | 606 | |
9771b263 | 607 | return &(*used_temp_slots)[level]; |
0aea6467 ZD |
608 | } |
609 | ||
610 | /* Returns the maximal temporary slot level. */ | |
611 | ||
612 | static int | |
613 | max_slot_level (void) | |
614 | { | |
615 | if (!used_temp_slots) | |
616 | return -1; | |
617 | ||
9771b263 | 618 | return used_temp_slots->length () - 1; |
0aea6467 ZD |
619 | } |
620 | ||
621 | /* Moves temporary slot TEMP to LEVEL. */ | |
622 | ||
623 | static void | |
624 | move_slot_to_level (struct temp_slot *temp, int level) | |
625 | { | |
626 | cut_slot_from_list (temp, temp_slots_at_level (temp->level)); | |
627 | insert_slot_to_list (temp, temp_slots_at_level (level)); | |
628 | temp->level = level; | |
629 | } | |
630 | ||
631 | /* Make temporary slot TEMP available. */ | |
632 | ||
633 | static void | |
634 | make_slot_available (struct temp_slot *temp) | |
635 | { | |
636 | cut_slot_from_list (temp, temp_slots_at_level (temp->level)); | |
637 | insert_slot_to_list (temp, &avail_temp_slots); | |
638 | temp->in_use = 0; | |
639 | temp->level = -1; | |
f8395d62 | 640 | n_temp_slots_in_use--; |
0aea6467 | 641 | } |
fb0703f7 SB |
642 | |
643 | /* Compute the hash value for an address -> temp slot mapping. | |
644 | The value is cached on the mapping entry. */ | |
645 | static hashval_t | |
646 | temp_slot_address_compute_hash (struct temp_slot_address_entry *t) | |
647 | { | |
648 | int do_not_record = 0; | |
649 | return hash_rtx (t->address, GET_MODE (t->address), | |
650 | &do_not_record, NULL, false); | |
651 | } | |
652 | ||
653 | /* Return the hash value for an address -> temp slot mapping. */ | |
2a22f99c TS |
654 | hashval_t |
655 | temp_address_hasher::hash (temp_slot_address_entry *t) | |
fb0703f7 | 656 | { |
fb0703f7 SB |
657 | return t->hash; |
658 | } | |
659 | ||
660 | /* Compare two address -> temp slot mapping entries. */ | |
2a22f99c TS |
661 | bool |
662 | temp_address_hasher::equal (temp_slot_address_entry *t1, | |
663 | temp_slot_address_entry *t2) | |
fb0703f7 | 664 | { |
fb0703f7 SB |
665 | return exp_equiv_p (t1->address, t2->address, 0, true); |
666 | } | |
667 | ||
668 | /* Add ADDRESS as an alias of TEMP_SLOT to the addess -> temp slot mapping. */ | |
669 | static void | |
670 | insert_temp_slot_address (rtx address, struct temp_slot *temp_slot) | |
671 | { | |
766090c2 | 672 | struct temp_slot_address_entry *t = ggc_alloc<temp_slot_address_entry> (); |
fb0703f7 SB |
673 | t->address = address; |
674 | t->temp_slot = temp_slot; | |
675 | t->hash = temp_slot_address_compute_hash (t); | |
2a22f99c | 676 | *temp_slot_address_table->find_slot_with_hash (t, t->hash, INSERT) = t; |
fb0703f7 SB |
677 | } |
678 | ||
679 | /* Remove an address -> temp slot mapping entry if the temp slot is | |
680 | not in use anymore. Callback for remove_unused_temp_slot_addresses. */ | |
2a22f99c TS |
681 | int |
682 | remove_unused_temp_slot_addresses_1 (temp_slot_address_entry **slot, void *) | |
fb0703f7 | 683 | { |
2a22f99c | 684 | const struct temp_slot_address_entry *t = *slot; |
fb0703f7 | 685 | if (! t->temp_slot->in_use) |
2a22f99c | 686 | temp_slot_address_table->clear_slot (slot); |
fb0703f7 SB |
687 | return 1; |
688 | } | |
689 | ||
690 | /* Remove all mappings of addresses to unused temp slots. */ | |
691 | static void | |
692 | remove_unused_temp_slot_addresses (void) | |
693 | { | |
f8395d62 MM |
694 | /* Use quicker clearing if there aren't any active temp slots. */ |
695 | if (n_temp_slots_in_use) | |
2a22f99c TS |
696 | temp_slot_address_table->traverse |
697 | <void *, remove_unused_temp_slot_addresses_1> (NULL); | |
f8395d62 | 698 | else |
2a22f99c | 699 | temp_slot_address_table->empty (); |
fb0703f7 SB |
700 | } |
701 | ||
702 | /* Find the temp slot corresponding to the object at address X. */ | |
703 | ||
704 | static struct temp_slot * | |
705 | find_temp_slot_from_address (rtx x) | |
706 | { | |
707 | struct temp_slot *p; | |
708 | struct temp_slot_address_entry tmp, *t; | |
709 | ||
710 | /* First try the easy way: | |
711 | See if X exists in the address -> temp slot mapping. */ | |
712 | tmp.address = x; | |
713 | tmp.temp_slot = NULL; | |
714 | tmp.hash = temp_slot_address_compute_hash (&tmp); | |
2a22f99c | 715 | t = temp_slot_address_table->find_with_hash (&tmp, tmp.hash); |
fb0703f7 SB |
716 | if (t) |
717 | return t->temp_slot; | |
718 | ||
719 | /* If we have a sum involving a register, see if it points to a temp | |
720 | slot. */ | |
721 | if (GET_CODE (x) == PLUS && REG_P (XEXP (x, 0)) | |
722 | && (p = find_temp_slot_from_address (XEXP (x, 0))) != 0) | |
723 | return p; | |
724 | else if (GET_CODE (x) == PLUS && REG_P (XEXP (x, 1)) | |
725 | && (p = find_temp_slot_from_address (XEXP (x, 1))) != 0) | |
726 | return p; | |
727 | ||
728 | /* Last resort: Address is a virtual stack var address. */ | |
729 | if (GET_CODE (x) == PLUS | |
730 | && XEXP (x, 0) == virtual_stack_vars_rtx | |
481683e1 | 731 | && CONST_INT_P (XEXP (x, 1))) |
fb0703f7 SB |
732 | { |
733 | int i; | |
734 | for (i = max_slot_level (); i >= 0; i--) | |
735 | for (p = *temp_slots_at_level (i); p; p = p->next) | |
736 | { | |
737 | if (INTVAL (XEXP (x, 1)) >= p->base_offset | |
738 | && INTVAL (XEXP (x, 1)) < p->base_offset + p->full_size) | |
739 | return p; | |
740 | } | |
741 | } | |
742 | ||
743 | return NULL; | |
744 | } | |
6f086dfc RS |
745 | \f |
746 | /* Allocate a temporary stack slot and record it for possible later | |
747 | reuse. | |
748 | ||
749 | MODE is the machine mode to be given to the returned rtx. | |
750 | ||
751 | SIZE is the size in units of the space required. We do no rounding here | |
752 | since assign_stack_local will do any required rounding. | |
753 | ||
a4c6502a | 754 | TYPE is the type that will be used for the stack slot. */ |
6f086dfc | 755 | |
a06ef755 | 756 | rtx |
ef4bddc2 | 757 | assign_stack_temp_for_type (machine_mode mode, HOST_WIDE_INT size, |
9474e8ab | 758 | tree type) |
6f086dfc | 759 | { |
74e2819c | 760 | unsigned int align; |
0aea6467 | 761 | struct temp_slot *p, *best_p = 0, *selected = NULL, **pp; |
faa964e5 | 762 | rtx slot; |
6f086dfc | 763 | |
303ec2aa RK |
764 | /* If SIZE is -1 it means that somebody tried to allocate a temporary |
765 | of a variable size. */ | |
0bccc606 | 766 | gcc_assert (size != -1); |
303ec2aa | 767 | |
76fe54f0 | 768 | align = get_stack_local_alignment (type, mode); |
d16790f2 JW |
769 | |
770 | /* Try to find an available, already-allocated temporary of the proper | |
771 | mode which meets the size and alignment requirements. Choose the | |
3e8b0446 | 772 | smallest one with the closest alignment. |
b8698a0f | 773 | |
3e8b0446 ZD |
774 | If assign_stack_temp is called outside of the tree->rtl expansion, |
775 | we cannot reuse the stack slots (that may still refer to | |
776 | VIRTUAL_STACK_VARS_REGNUM). */ | |
777 | if (!virtuals_instantiated) | |
0aea6467 | 778 | { |
3e8b0446 | 779 | for (p = avail_temp_slots; p; p = p->next) |
0aea6467 | 780 | { |
3e8b0446 ZD |
781 | if (p->align >= align && p->size >= size |
782 | && GET_MODE (p->slot) == mode | |
783 | && objects_must_conflict_p (p->type, type) | |
784 | && (best_p == 0 || best_p->size > p->size | |
785 | || (best_p->size == p->size && best_p->align > p->align))) | |
0aea6467 | 786 | { |
3e8b0446 ZD |
787 | if (p->align == align && p->size == size) |
788 | { | |
789 | selected = p; | |
790 | cut_slot_from_list (selected, &avail_temp_slots); | |
791 | best_p = 0; | |
792 | break; | |
793 | } | |
794 | best_p = p; | |
0aea6467 | 795 | } |
0aea6467 ZD |
796 | } |
797 | } | |
6f086dfc RS |
798 | |
799 | /* Make our best, if any, the one to use. */ | |
800 | if (best_p) | |
a45035b6 | 801 | { |
0aea6467 ZD |
802 | selected = best_p; |
803 | cut_slot_from_list (selected, &avail_temp_slots); | |
804 | ||
a45035b6 JW |
805 | /* If there are enough aligned bytes left over, make them into a new |
806 | temp_slot so that the extra bytes don't get wasted. Do this only | |
807 | for BLKmode slots, so that we can be sure of the alignment. */ | |
3bdf5ad1 | 808 | if (GET_MODE (best_p->slot) == BLKmode) |
a45035b6 | 809 | { |
d16790f2 | 810 | int alignment = best_p->align / BITS_PER_UNIT; |
e5e809f4 | 811 | HOST_WIDE_INT rounded_size = CEIL_ROUND (size, alignment); |
a45035b6 JW |
812 | |
813 | if (best_p->size - rounded_size >= alignment) | |
814 | { | |
766090c2 | 815 | p = ggc_alloc<temp_slot> (); |
9474e8ab | 816 | p->in_use = 0; |
a45035b6 | 817 | p->size = best_p->size - rounded_size; |
307d8cd6 RK |
818 | p->base_offset = best_p->base_offset + rounded_size; |
819 | p->full_size = best_p->full_size - rounded_size; | |
be0c514c | 820 | p->slot = adjust_address_nv (best_p->slot, BLKmode, rounded_size); |
d16790f2 | 821 | p->align = best_p->align; |
1da68f56 | 822 | p->type = best_p->type; |
0aea6467 | 823 | insert_slot_to_list (p, &avail_temp_slots); |
a45035b6 | 824 | |
38a448ca RH |
825 | stack_slot_list = gen_rtx_EXPR_LIST (VOIDmode, p->slot, |
826 | stack_slot_list); | |
a45035b6 JW |
827 | |
828 | best_p->size = rounded_size; | |
291dde90 | 829 | best_p->full_size = rounded_size; |
a45035b6 JW |
830 | } |
831 | } | |
a45035b6 | 832 | } |
718fe406 | 833 | |
6f086dfc | 834 | /* If we still didn't find one, make a new temporary. */ |
0aea6467 | 835 | if (selected == 0) |
6f086dfc | 836 | { |
e5e809f4 JL |
837 | HOST_WIDE_INT frame_offset_old = frame_offset; |
838 | ||
766090c2 | 839 | p = ggc_alloc<temp_slot> (); |
e5e809f4 | 840 | |
c87a0a39 JL |
841 | /* We are passing an explicit alignment request to assign_stack_local. |
842 | One side effect of that is assign_stack_local will not round SIZE | |
843 | to ensure the frame offset remains suitably aligned. | |
844 | ||
845 | So for requests which depended on the rounding of SIZE, we go ahead | |
846 | and round it now. We also make sure ALIGNMENT is at least | |
847 | BIGGEST_ALIGNMENT. */ | |
0bccc606 | 848 | gcc_assert (mode != BLKmode || align == BIGGEST_ALIGNMENT); |
80a832cd JJ |
849 | p->slot = assign_stack_local_1 (mode, |
850 | (mode == BLKmode | |
851 | ? CEIL_ROUND (size, | |
852 | (int) align | |
853 | / BITS_PER_UNIT) | |
854 | : size), | |
855 | align, 0); | |
d16790f2 JW |
856 | |
857 | p->align = align; | |
e5e809f4 | 858 | |
b2a80c0d DE |
859 | /* The following slot size computation is necessary because we don't |
860 | know the actual size of the temporary slot until assign_stack_local | |
861 | has performed all the frame alignment and size rounding for the | |
fc91b0d0 RK |
862 | requested temporary. Note that extra space added for alignment |
863 | can be either above or below this stack slot depending on which | |
864 | way the frame grows. We include the extra space if and only if it | |
865 | is above this slot. */ | |
f62c8a5c JJ |
866 | if (FRAME_GROWS_DOWNWARD) |
867 | p->size = frame_offset_old - frame_offset; | |
868 | else | |
869 | p->size = size; | |
e5e809f4 | 870 | |
fc91b0d0 | 871 | /* Now define the fields used by combine_temp_slots. */ |
f62c8a5c JJ |
872 | if (FRAME_GROWS_DOWNWARD) |
873 | { | |
874 | p->base_offset = frame_offset; | |
875 | p->full_size = frame_offset_old - frame_offset; | |
876 | } | |
877 | else | |
878 | { | |
879 | p->base_offset = frame_offset_old; | |
880 | p->full_size = frame_offset - frame_offset_old; | |
881 | } | |
0aea6467 ZD |
882 | |
883 | selected = p; | |
6f086dfc RS |
884 | } |
885 | ||
0aea6467 | 886 | p = selected; |
6f086dfc | 887 | p->in_use = 1; |
1da68f56 | 888 | p->type = type; |
7efcb746 | 889 | p->level = temp_slot_level; |
f8395d62 | 890 | n_temp_slots_in_use++; |
1995f267 | 891 | |
0aea6467 ZD |
892 | pp = temp_slots_at_level (p->level); |
893 | insert_slot_to_list (p, pp); | |
fb0703f7 | 894 | insert_temp_slot_address (XEXP (p->slot, 0), p); |
faa964e5 UW |
895 | |
896 | /* Create a new MEM rtx to avoid clobbering MEM flags of old slots. */ | |
897 | slot = gen_rtx_MEM (mode, XEXP (p->slot, 0)); | |
898 | stack_slot_list = gen_rtx_EXPR_LIST (VOIDmode, slot, stack_slot_list); | |
3bdf5ad1 | 899 | |
1da68f56 RK |
900 | /* If we know the alias set for the memory that will be used, use |
901 | it. If there's no TYPE, then we don't know anything about the | |
902 | alias set for the memory. */ | |
faa964e5 UW |
903 | set_mem_alias_set (slot, type ? get_alias_set (type) : 0); |
904 | set_mem_align (slot, align); | |
1da68f56 | 905 | |
30f7a378 | 906 | /* If a type is specified, set the relevant flags. */ |
3bdf5ad1 | 907 | if (type != 0) |
55356334 | 908 | MEM_VOLATILE_P (slot) = TYPE_VOLATILE (type); |
be0c514c | 909 | MEM_NOTRAP_P (slot) = 1; |
3bdf5ad1 | 910 | |
faa964e5 | 911 | return slot; |
6f086dfc | 912 | } |
d16790f2 JW |
913 | |
914 | /* Allocate a temporary stack slot and record it for possible later | |
9474e8ab | 915 | reuse. First two arguments are same as in preceding function. */ |
d16790f2 JW |
916 | |
917 | rtx | |
ef4bddc2 | 918 | assign_stack_temp (machine_mode mode, HOST_WIDE_INT size) |
d16790f2 | 919 | { |
9474e8ab | 920 | return assign_stack_temp_for_type (mode, size, NULL_TREE); |
d16790f2 | 921 | } |
638141a6 | 922 | \f |
9432c136 EB |
923 | /* Assign a temporary. |
924 | If TYPE_OR_DECL is a decl, then we are doing it on behalf of the decl | |
925 | and so that should be used in error messages. In either case, we | |
926 | allocate of the given type. | |
230f21b4 | 927 | MEMORY_REQUIRED is 1 if the result must be addressable stack memory; |
b55d9ff8 RK |
928 | it is 0 if a register is OK. |
929 | DONT_PROMOTE is 1 if we should not promote values in register | |
930 | to wider modes. */ | |
230f21b4 PB |
931 | |
932 | rtx | |
9474e8ab | 933 | assign_temp (tree type_or_decl, int memory_required, |
fa8db1f7 | 934 | int dont_promote ATTRIBUTE_UNUSED) |
230f21b4 | 935 | { |
9432c136 | 936 | tree type, decl; |
ef4bddc2 | 937 | machine_mode mode; |
9e1622ed | 938 | #ifdef PROMOTE_MODE |
9432c136 EB |
939 | int unsignedp; |
940 | #endif | |
941 | ||
942 | if (DECL_P (type_or_decl)) | |
943 | decl = type_or_decl, type = TREE_TYPE (decl); | |
944 | else | |
945 | decl = NULL, type = type_or_decl; | |
946 | ||
947 | mode = TYPE_MODE (type); | |
9e1622ed | 948 | #ifdef PROMOTE_MODE |
8df83eae | 949 | unsignedp = TYPE_UNSIGNED (type); |
0ce8a59c | 950 | #endif |
638141a6 | 951 | |
230f21b4 PB |
952 | if (mode == BLKmode || memory_required) |
953 | { | |
e5e809f4 | 954 | HOST_WIDE_INT size = int_size_in_bytes (type); |
230f21b4 PB |
955 | rtx tmp; |
956 | ||
44affdae JH |
957 | /* Zero sized arrays are GNU C extension. Set size to 1 to avoid |
958 | problems with allocating the stack space. */ | |
959 | if (size == 0) | |
960 | size = 1; | |
961 | ||
230f21b4 | 962 | /* Unfortunately, we don't yet know how to allocate variable-sized |
a441447f OH |
963 | temporaries. However, sometimes we can find a fixed upper limit on |
964 | the size, so try that instead. */ | |
965 | else if (size == -1) | |
966 | size = max_int_size_in_bytes (type); | |
e30bb772 | 967 | |
9432c136 EB |
968 | /* The size of the temporary may be too large to fit into an integer. */ |
969 | /* ??? Not sure this should happen except for user silliness, so limit | |
797a6ac1 | 970 | this to things that aren't compiler-generated temporaries. The |
535a42b1 | 971 | rest of the time we'll die in assign_stack_temp_for_type. */ |
9432c136 EB |
972 | if (decl && size == -1 |
973 | && TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST) | |
974 | { | |
dee15844 | 975 | error ("size of variable %q+D is too large", decl); |
9432c136 EB |
976 | size = 1; |
977 | } | |
978 | ||
9474e8ab | 979 | tmp = assign_stack_temp_for_type (mode, size, type); |
230f21b4 PB |
980 | return tmp; |
981 | } | |
638141a6 | 982 | |
9e1622ed | 983 | #ifdef PROMOTE_MODE |
b55d9ff8 | 984 | if (! dont_promote) |
cde0f3fd | 985 | mode = promote_mode (type, mode, &unsignedp); |
230f21b4 | 986 | #endif |
638141a6 | 987 | |
230f21b4 PB |
988 | return gen_reg_rtx (mode); |
989 | } | |
638141a6 | 990 | \f |
a45035b6 JW |
991 | /* Combine temporary stack slots which are adjacent on the stack. |
992 | ||
993 | This allows for better use of already allocated stack space. This is only | |
994 | done for BLKmode slots because we can be sure that we won't have alignment | |
995 | problems in this case. */ | |
996 | ||
6fe79279 | 997 | static void |
fa8db1f7 | 998 | combine_temp_slots (void) |
a45035b6 | 999 | { |
0aea6467 | 1000 | struct temp_slot *p, *q, *next, *next_q; |
e5e809f4 JL |
1001 | int num_slots; |
1002 | ||
a4c6502a MM |
1003 | /* We can't combine slots, because the information about which slot |
1004 | is in which alias set will be lost. */ | |
1005 | if (flag_strict_aliasing) | |
1006 | return; | |
1007 | ||
718fe406 | 1008 | /* If there are a lot of temp slots, don't do anything unless |
d6a7951f | 1009 | high levels of optimization. */ |
e5e809f4 | 1010 | if (! flag_expensive_optimizations) |
0aea6467 | 1011 | for (p = avail_temp_slots, num_slots = 0; p; p = p->next, num_slots++) |
e5e809f4 JL |
1012 | if (num_slots > 100 || (num_slots > 10 && optimize == 0)) |
1013 | return; | |
a45035b6 | 1014 | |
0aea6467 | 1015 | for (p = avail_temp_slots; p; p = next) |
e9b7093a RS |
1016 | { |
1017 | int delete_p = 0; | |
e5e809f4 | 1018 | |
0aea6467 ZD |
1019 | next = p->next; |
1020 | ||
1021 | if (GET_MODE (p->slot) != BLKmode) | |
1022 | continue; | |
1023 | ||
1024 | for (q = p->next; q; q = next_q) | |
e9b7093a | 1025 | { |
0aea6467 ZD |
1026 | int delete_q = 0; |
1027 | ||
1028 | next_q = q->next; | |
1029 | ||
1030 | if (GET_MODE (q->slot) != BLKmode) | |
1031 | continue; | |
1032 | ||
1033 | if (p->base_offset + p->full_size == q->base_offset) | |
1034 | { | |
1035 | /* Q comes after P; combine Q into P. */ | |
1036 | p->size += q->size; | |
1037 | p->full_size += q->full_size; | |
1038 | delete_q = 1; | |
1039 | } | |
1040 | else if (q->base_offset + q->full_size == p->base_offset) | |
1041 | { | |
1042 | /* P comes after Q; combine P into Q. */ | |
1043 | q->size += p->size; | |
1044 | q->full_size += p->full_size; | |
1045 | delete_p = 1; | |
1046 | break; | |
1047 | } | |
1048 | if (delete_q) | |
1049 | cut_slot_from_list (q, &avail_temp_slots); | |
e9b7093a | 1050 | } |
0aea6467 ZD |
1051 | |
1052 | /* Either delete P or advance past it. */ | |
1053 | if (delete_p) | |
1054 | cut_slot_from_list (p, &avail_temp_slots); | |
e9b7093a | 1055 | } |
a45035b6 | 1056 | } |
6f086dfc | 1057 | \f |
82d6e6fc KG |
1058 | /* Indicate that NEW_RTX is an alternate way of referring to the temp |
1059 | slot that previously was known by OLD_RTX. */ | |
e5e76139 RK |
1060 | |
1061 | void | |
82d6e6fc | 1062 | update_temp_slot_address (rtx old_rtx, rtx new_rtx) |
e5e76139 | 1063 | { |
14a774a9 | 1064 | struct temp_slot *p; |
e5e76139 | 1065 | |
82d6e6fc | 1066 | if (rtx_equal_p (old_rtx, new_rtx)) |
e5e76139 | 1067 | return; |
14a774a9 | 1068 | |
82d6e6fc | 1069 | p = find_temp_slot_from_address (old_rtx); |
14a774a9 | 1070 | |
82d6e6fc KG |
1071 | /* If we didn't find one, see if both OLD_RTX is a PLUS. If so, and |
1072 | NEW_RTX is a register, see if one operand of the PLUS is a | |
1073 | temporary location. If so, NEW_RTX points into it. Otherwise, | |
1074 | if both OLD_RTX and NEW_RTX are a PLUS and if there is a register | |
1075 | in common between them. If so, try a recursive call on those | |
1076 | values. */ | |
14a774a9 RK |
1077 | if (p == 0) |
1078 | { | |
82d6e6fc | 1079 | if (GET_CODE (old_rtx) != PLUS) |
700f19f0 RK |
1080 | return; |
1081 | ||
82d6e6fc | 1082 | if (REG_P (new_rtx)) |
700f19f0 | 1083 | { |
82d6e6fc KG |
1084 | update_temp_slot_address (XEXP (old_rtx, 0), new_rtx); |
1085 | update_temp_slot_address (XEXP (old_rtx, 1), new_rtx); | |
700f19f0 RK |
1086 | return; |
1087 | } | |
82d6e6fc | 1088 | else if (GET_CODE (new_rtx) != PLUS) |
14a774a9 RK |
1089 | return; |
1090 | ||
82d6e6fc KG |
1091 | if (rtx_equal_p (XEXP (old_rtx, 0), XEXP (new_rtx, 0))) |
1092 | update_temp_slot_address (XEXP (old_rtx, 1), XEXP (new_rtx, 1)); | |
1093 | else if (rtx_equal_p (XEXP (old_rtx, 1), XEXP (new_rtx, 0))) | |
1094 | update_temp_slot_address (XEXP (old_rtx, 0), XEXP (new_rtx, 1)); | |
1095 | else if (rtx_equal_p (XEXP (old_rtx, 0), XEXP (new_rtx, 1))) | |
1096 | update_temp_slot_address (XEXP (old_rtx, 1), XEXP (new_rtx, 0)); | |
1097 | else if (rtx_equal_p (XEXP (old_rtx, 1), XEXP (new_rtx, 1))) | |
1098 | update_temp_slot_address (XEXP (old_rtx, 0), XEXP (new_rtx, 0)); | |
14a774a9 RK |
1099 | |
1100 | return; | |
1101 | } | |
1102 | ||
718fe406 | 1103 | /* Otherwise add an alias for the temp's address. */ |
fb0703f7 | 1104 | insert_temp_slot_address (new_rtx, p); |
e5e76139 RK |
1105 | } |
1106 | ||
9cca6a99 MS |
1107 | /* If X could be a reference to a temporary slot, mark that slot as |
1108 | belonging to the to one level higher than the current level. If X | |
1109 | matched one of our slots, just mark that one. Otherwise, we can't | |
9474e8ab | 1110 | easily predict which it is, so upgrade all of them. |
6f086dfc RS |
1111 | |
1112 | This is called when an ({...}) construct occurs and a statement | |
1113 | returns a value in memory. */ | |
1114 | ||
1115 | void | |
fa8db1f7 | 1116 | preserve_temp_slots (rtx x) |
6f086dfc | 1117 | { |
0aea6467 | 1118 | struct temp_slot *p = 0, *next; |
6f086dfc | 1119 | |
e3a77161 | 1120 | if (x == 0) |
9474e8ab | 1121 | return; |
f7b6d104 | 1122 | |
8fff4fc1 | 1123 | /* If X is a register that is being used as a pointer, see if we have |
9474e8ab | 1124 | a temporary slot we know it points to. */ |
8fff4fc1 RH |
1125 | if (REG_P (x) && REG_POINTER (x)) |
1126 | p = find_temp_slot_from_address (x); | |
f7b6d104 | 1127 | |
8fff4fc1 | 1128 | /* If X is not in memory or is at a constant address, it cannot be in |
9474e8ab | 1129 | a temporary slot. */ |
8fff4fc1 | 1130 | if (p == 0 && (!MEM_P (x) || CONSTANT_P (XEXP (x, 0)))) |
9474e8ab | 1131 | return; |
8fff4fc1 RH |
1132 | |
1133 | /* First see if we can find a match. */ | |
1134 | if (p == 0) | |
1135 | p = find_temp_slot_from_address (XEXP (x, 0)); | |
1136 | ||
1137 | if (p != 0) | |
1138 | { | |
8fff4fc1 | 1139 | if (p->level == temp_slot_level) |
9474e8ab | 1140 | move_slot_to_level (p, temp_slot_level - 1); |
8fff4fc1 | 1141 | return; |
f7b6d104 | 1142 | } |
e9a25f70 | 1143 | |
8fff4fc1 RH |
1144 | /* Otherwise, preserve all non-kept slots at this level. */ |
1145 | for (p = *temp_slots_at_level (temp_slot_level); p; p = next) | |
e9a25f70 | 1146 | { |
8fff4fc1 | 1147 | next = p->next; |
9474e8ab | 1148 | move_slot_to_level (p, temp_slot_level - 1); |
8fff4fc1 | 1149 | } |
fe9b4957 MM |
1150 | } |
1151 | ||
8fff4fc1 RH |
1152 | /* Free all temporaries used so far. This is normally called at the |
1153 | end of generating code for a statement. */ | |
fe9b4957 | 1154 | |
8fff4fc1 RH |
1155 | void |
1156 | free_temp_slots (void) | |
fe9b4957 | 1157 | { |
8fff4fc1 | 1158 | struct temp_slot *p, *next; |
5d7cefe5 | 1159 | bool some_available = false; |
fe9b4957 | 1160 | |
8fff4fc1 RH |
1161 | for (p = *temp_slots_at_level (temp_slot_level); p; p = next) |
1162 | { | |
1163 | next = p->next; | |
9474e8ab MM |
1164 | make_slot_available (p); |
1165 | some_available = true; | |
8fff4fc1 | 1166 | } |
fe9b4957 | 1167 | |
5d7cefe5 MM |
1168 | if (some_available) |
1169 | { | |
1170 | remove_unused_temp_slot_addresses (); | |
1171 | combine_temp_slots (); | |
1172 | } | |
8fff4fc1 | 1173 | } |
fe9b4957 | 1174 | |
8fff4fc1 | 1175 | /* Push deeper into the nesting level for stack temporaries. */ |
fe9b4957 | 1176 | |
8fff4fc1 RH |
1177 | void |
1178 | push_temp_slots (void) | |
fe9b4957 | 1179 | { |
8fff4fc1 | 1180 | temp_slot_level++; |
fe9b4957 MM |
1181 | } |
1182 | ||
8fff4fc1 RH |
1183 | /* Pop a temporary nesting level. All slots in use in the current level |
1184 | are freed. */ | |
fe9b4957 | 1185 | |
8fff4fc1 RH |
1186 | void |
1187 | pop_temp_slots (void) | |
fe9b4957 | 1188 | { |
9474e8ab | 1189 | free_temp_slots (); |
8fff4fc1 | 1190 | temp_slot_level--; |
8c36698e NC |
1191 | } |
1192 | ||
8fff4fc1 | 1193 | /* Initialize temporary slots. */ |
e9a25f70 JL |
1194 | |
1195 | void | |
8fff4fc1 | 1196 | init_temp_slots (void) |
e9a25f70 | 1197 | { |
8fff4fc1 RH |
1198 | /* We have not allocated any temporaries yet. */ |
1199 | avail_temp_slots = 0; | |
9771b263 | 1200 | vec_alloc (used_temp_slots, 0); |
8fff4fc1 | 1201 | temp_slot_level = 0; |
f8395d62 | 1202 | n_temp_slots_in_use = 0; |
fb0703f7 SB |
1203 | |
1204 | /* Set up the table to map addresses to temp slots. */ | |
1205 | if (! temp_slot_address_table) | |
2a22f99c | 1206 | temp_slot_address_table = hash_table<temp_address_hasher>::create_ggc (32); |
fb0703f7 | 1207 | else |
2a22f99c | 1208 | temp_slot_address_table->empty (); |
8fff4fc1 RH |
1209 | } |
1210 | \f | |
6399c0ab SB |
1211 | /* Functions and data structures to keep track of the values hard regs |
1212 | had at the start of the function. */ | |
1213 | ||
1214 | /* Private type used by get_hard_reg_initial_reg, get_hard_reg_initial_val, | |
1215 | and has_hard_reg_initial_val.. */ | |
1216 | typedef struct GTY(()) initial_value_pair { | |
1217 | rtx hard_reg; | |
1218 | rtx pseudo; | |
1219 | } initial_value_pair; | |
1220 | /* ??? This could be a VEC but there is currently no way to define an | |
1221 | opaque VEC type. This could be worked around by defining struct | |
1222 | initial_value_pair in function.h. */ | |
1223 | typedef struct GTY(()) initial_value_struct { | |
1224 | int num_entries; | |
1225 | int max_entries; | |
1226 | initial_value_pair * GTY ((length ("%h.num_entries"))) entries; | |
1227 | } initial_value_struct; | |
1228 | ||
1229 | /* If a pseudo represents an initial hard reg (or expression), return | |
1230 | it, else return NULL_RTX. */ | |
1231 | ||
1232 | rtx | |
1233 | get_hard_reg_initial_reg (rtx reg) | |
1234 | { | |
1235 | struct initial_value_struct *ivs = crtl->hard_reg_initial_vals; | |
1236 | int i; | |
1237 | ||
1238 | if (ivs == 0) | |
1239 | return NULL_RTX; | |
1240 | ||
1241 | for (i = 0; i < ivs->num_entries; i++) | |
1242 | if (rtx_equal_p (ivs->entries[i].pseudo, reg)) | |
1243 | return ivs->entries[i].hard_reg; | |
1244 | ||
1245 | return NULL_RTX; | |
1246 | } | |
1247 | ||
1248 | /* Make sure that there's a pseudo register of mode MODE that stores the | |
1249 | initial value of hard register REGNO. Return an rtx for such a pseudo. */ | |
1250 | ||
1251 | rtx | |
ef4bddc2 | 1252 | get_hard_reg_initial_val (machine_mode mode, unsigned int regno) |
6399c0ab SB |
1253 | { |
1254 | struct initial_value_struct *ivs; | |
1255 | rtx rv; | |
1256 | ||
1257 | rv = has_hard_reg_initial_val (mode, regno); | |
1258 | if (rv) | |
1259 | return rv; | |
1260 | ||
1261 | ivs = crtl->hard_reg_initial_vals; | |
1262 | if (ivs == 0) | |
1263 | { | |
766090c2 | 1264 | ivs = ggc_alloc<initial_value_struct> (); |
6399c0ab SB |
1265 | ivs->num_entries = 0; |
1266 | ivs->max_entries = 5; | |
766090c2 | 1267 | ivs->entries = ggc_vec_alloc<initial_value_pair> (5); |
6399c0ab SB |
1268 | crtl->hard_reg_initial_vals = ivs; |
1269 | } | |
1270 | ||
1271 | if (ivs->num_entries >= ivs->max_entries) | |
1272 | { | |
1273 | ivs->max_entries += 5; | |
1274 | ivs->entries = GGC_RESIZEVEC (initial_value_pair, ivs->entries, | |
1275 | ivs->max_entries); | |
1276 | } | |
1277 | ||
1278 | ivs->entries[ivs->num_entries].hard_reg = gen_rtx_REG (mode, regno); | |
1279 | ivs->entries[ivs->num_entries].pseudo = gen_reg_rtx (mode); | |
1280 | ||
1281 | return ivs->entries[ivs->num_entries++].pseudo; | |
1282 | } | |
1283 | ||
1284 | /* See if get_hard_reg_initial_val has been used to create a pseudo | |
1285 | for the initial value of hard register REGNO in mode MODE. Return | |
1286 | the associated pseudo if so, otherwise return NULL. */ | |
1287 | ||
1288 | rtx | |
ef4bddc2 | 1289 | has_hard_reg_initial_val (machine_mode mode, unsigned int regno) |
6399c0ab SB |
1290 | { |
1291 | struct initial_value_struct *ivs; | |
1292 | int i; | |
1293 | ||
1294 | ivs = crtl->hard_reg_initial_vals; | |
1295 | if (ivs != 0) | |
1296 | for (i = 0; i < ivs->num_entries; i++) | |
1297 | if (GET_MODE (ivs->entries[i].hard_reg) == mode | |
1298 | && REGNO (ivs->entries[i].hard_reg) == regno) | |
1299 | return ivs->entries[i].pseudo; | |
1300 | ||
1301 | return NULL_RTX; | |
1302 | } | |
1303 | ||
1304 | unsigned int | |
1305 | emit_initial_value_sets (void) | |
1306 | { | |
1307 | struct initial_value_struct *ivs = crtl->hard_reg_initial_vals; | |
1308 | int i; | |
691fe203 | 1309 | rtx_insn *seq; |
6399c0ab SB |
1310 | |
1311 | if (ivs == 0) | |
1312 | return 0; | |
1313 | ||
1314 | start_sequence (); | |
1315 | for (i = 0; i < ivs->num_entries; i++) | |
1316 | emit_move_insn (ivs->entries[i].pseudo, ivs->entries[i].hard_reg); | |
1317 | seq = get_insns (); | |
1318 | end_sequence (); | |
1319 | ||
1320 | emit_insn_at_entry (seq); | |
1321 | return 0; | |
1322 | } | |
1323 | ||
1324 | /* Return the hardreg-pseudoreg initial values pair entry I and | |
1325 | TRUE if I is a valid entry, or FALSE if I is not a valid entry. */ | |
1326 | bool | |
1327 | initial_value_entry (int i, rtx *hreg, rtx *preg) | |
1328 | { | |
1329 | struct initial_value_struct *ivs = crtl->hard_reg_initial_vals; | |
1330 | if (!ivs || i >= ivs->num_entries) | |
1331 | return false; | |
1332 | ||
1333 | *hreg = ivs->entries[i].hard_reg; | |
1334 | *preg = ivs->entries[i].pseudo; | |
1335 | return true; | |
1336 | } | |
1337 | \f | |
8fff4fc1 RH |
1338 | /* These routines are responsible for converting virtual register references |
1339 | to the actual hard register references once RTL generation is complete. | |
718fe406 | 1340 | |
8fff4fc1 RH |
1341 | The following four variables are used for communication between the |
1342 | routines. They contain the offsets of the virtual registers from their | |
1343 | respective hard registers. */ | |
fe9b4957 | 1344 | |
8fff4fc1 RH |
1345 | static int in_arg_offset; |
1346 | static int var_offset; | |
1347 | static int dynamic_offset; | |
1348 | static int out_arg_offset; | |
1349 | static int cfa_offset; | |
8a5275eb | 1350 | |
8fff4fc1 RH |
1351 | /* In most machines, the stack pointer register is equivalent to the bottom |
1352 | of the stack. */ | |
718fe406 | 1353 | |
8fff4fc1 RH |
1354 | #ifndef STACK_POINTER_OFFSET |
1355 | #define STACK_POINTER_OFFSET 0 | |
1356 | #endif | |
8c36698e | 1357 | |
ddbb449f AM |
1358 | #if defined (REG_PARM_STACK_SPACE) && !defined (INCOMING_REG_PARM_STACK_SPACE) |
1359 | #define INCOMING_REG_PARM_STACK_SPACE REG_PARM_STACK_SPACE | |
1360 | #endif | |
1361 | ||
8fff4fc1 RH |
1362 | /* If not defined, pick an appropriate default for the offset of dynamically |
1363 | allocated memory depending on the value of ACCUMULATE_OUTGOING_ARGS, | |
ddbb449f | 1364 | INCOMING_REG_PARM_STACK_SPACE, and OUTGOING_REG_PARM_STACK_SPACE. */ |
fe9b4957 | 1365 | |
8fff4fc1 | 1366 | #ifndef STACK_DYNAMIC_OFFSET |
8a5275eb | 1367 | |
8fff4fc1 RH |
1368 | /* The bottom of the stack points to the actual arguments. If |
1369 | REG_PARM_STACK_SPACE is defined, this includes the space for the register | |
1370 | parameters. However, if OUTGOING_REG_PARM_STACK space is not defined, | |
1371 | stack space for register parameters is not pushed by the caller, but | |
1372 | rather part of the fixed stack areas and hence not included in | |
38173d38 | 1373 | `crtl->outgoing_args_size'. Nevertheless, we must allow |
8fff4fc1 | 1374 | for it when allocating stack dynamic objects. */ |
8a5275eb | 1375 | |
ddbb449f | 1376 | #ifdef INCOMING_REG_PARM_STACK_SPACE |
8fff4fc1 RH |
1377 | #define STACK_DYNAMIC_OFFSET(FNDECL) \ |
1378 | ((ACCUMULATE_OUTGOING_ARGS \ | |
38173d38 | 1379 | ? (crtl->outgoing_args_size \ |
81464b2c | 1380 | + (OUTGOING_REG_PARM_STACK_SPACE ((!(FNDECL) ? NULL_TREE : TREE_TYPE (FNDECL))) ? 0 \ |
ddbb449f | 1381 | : INCOMING_REG_PARM_STACK_SPACE (FNDECL))) \ |
ac294f0b | 1382 | : 0) + (STACK_POINTER_OFFSET)) |
8fff4fc1 RH |
1383 | #else |
1384 | #define STACK_DYNAMIC_OFFSET(FNDECL) \ | |
38173d38 | 1385 | ((ACCUMULATE_OUTGOING_ARGS ? crtl->outgoing_args_size : 0) \ |
8fff4fc1 RH |
1386 | + (STACK_POINTER_OFFSET)) |
1387 | #endif | |
1388 | #endif | |
4fa48eae | 1389 | |
659e47fb | 1390 | \f |
bbf9b913 RH |
1391 | /* Given a piece of RTX and a pointer to a HOST_WIDE_INT, if the RTX |
1392 | is a virtual register, return the equivalent hard register and set the | |
1393 | offset indirectly through the pointer. Otherwise, return 0. */ | |
6f086dfc | 1394 | |
bbf9b913 RH |
1395 | static rtx |
1396 | instantiate_new_reg (rtx x, HOST_WIDE_INT *poffset) | |
6f086dfc | 1397 | { |
82d6e6fc | 1398 | rtx new_rtx; |
bbf9b913 | 1399 | HOST_WIDE_INT offset; |
6f086dfc | 1400 | |
bbf9b913 | 1401 | if (x == virtual_incoming_args_rtx) |
2e3f842f | 1402 | { |
d015f7cc | 1403 | if (stack_realign_drap) |
2e3f842f | 1404 | { |
d015f7cc L |
1405 | /* Replace virtual_incoming_args_rtx with internal arg |
1406 | pointer if DRAP is used to realign stack. */ | |
82d6e6fc | 1407 | new_rtx = crtl->args.internal_arg_pointer; |
2e3f842f L |
1408 | offset = 0; |
1409 | } | |
1410 | else | |
82d6e6fc | 1411 | new_rtx = arg_pointer_rtx, offset = in_arg_offset; |
2e3f842f | 1412 | } |
bbf9b913 | 1413 | else if (x == virtual_stack_vars_rtx) |
82d6e6fc | 1414 | new_rtx = frame_pointer_rtx, offset = var_offset; |
bbf9b913 | 1415 | else if (x == virtual_stack_dynamic_rtx) |
82d6e6fc | 1416 | new_rtx = stack_pointer_rtx, offset = dynamic_offset; |
bbf9b913 | 1417 | else if (x == virtual_outgoing_args_rtx) |
82d6e6fc | 1418 | new_rtx = stack_pointer_rtx, offset = out_arg_offset; |
bbf9b913 | 1419 | else if (x == virtual_cfa_rtx) |
f6672e8e RH |
1420 | { |
1421 | #ifdef FRAME_POINTER_CFA_OFFSET | |
82d6e6fc | 1422 | new_rtx = frame_pointer_rtx; |
f6672e8e | 1423 | #else |
82d6e6fc | 1424 | new_rtx = arg_pointer_rtx; |
f6672e8e RH |
1425 | #endif |
1426 | offset = cfa_offset; | |
1427 | } | |
32990d5b JJ |
1428 | else if (x == virtual_preferred_stack_boundary_rtx) |
1429 | { | |
1430 | new_rtx = GEN_INT (crtl->preferred_stack_boundary / BITS_PER_UNIT); | |
1431 | offset = 0; | |
1432 | } | |
bbf9b913 RH |
1433 | else |
1434 | return NULL_RTX; | |
6f086dfc | 1435 | |
bbf9b913 | 1436 | *poffset = offset; |
82d6e6fc | 1437 | return new_rtx; |
6f086dfc RS |
1438 | } |
1439 | ||
b8704801 RS |
1440 | /* A subroutine of instantiate_virtual_regs. Instantiate any virtual |
1441 | registers present inside of *LOC. The expression is simplified, | |
1442 | as much as possible, but is not to be considered "valid" in any sense | |
1443 | implied by the target. Return true if any change is made. */ | |
6f086dfc | 1444 | |
b8704801 RS |
1445 | static bool |
1446 | instantiate_virtual_regs_in_rtx (rtx *loc) | |
6f086dfc | 1447 | { |
b8704801 RS |
1448 | if (!*loc) |
1449 | return false; | |
1450 | bool changed = false; | |
1451 | subrtx_ptr_iterator::array_type array; | |
1452 | FOR_EACH_SUBRTX_PTR (iter, array, loc, NONCONST) | |
6f086dfc | 1453 | { |
b8704801 RS |
1454 | rtx *loc = *iter; |
1455 | if (rtx x = *loc) | |
bbf9b913 | 1456 | { |
b8704801 RS |
1457 | rtx new_rtx; |
1458 | HOST_WIDE_INT offset; | |
1459 | switch (GET_CODE (x)) | |
1460 | { | |
1461 | case REG: | |
1462 | new_rtx = instantiate_new_reg (x, &offset); | |
1463 | if (new_rtx) | |
1464 | { | |
1465 | *loc = plus_constant (GET_MODE (x), new_rtx, offset); | |
1466 | changed = true; | |
1467 | } | |
1468 | iter.skip_subrtxes (); | |
1469 | break; | |
bbf9b913 | 1470 | |
b8704801 RS |
1471 | case PLUS: |
1472 | new_rtx = instantiate_new_reg (XEXP (x, 0), &offset); | |
1473 | if (new_rtx) | |
1474 | { | |
1475 | XEXP (x, 0) = new_rtx; | |
1476 | *loc = plus_constant (GET_MODE (x), x, offset, true); | |
1477 | changed = true; | |
1478 | iter.skip_subrtxes (); | |
1479 | break; | |
1480 | } | |
e5e809f4 | 1481 | |
b8704801 RS |
1482 | /* FIXME -- from old code */ |
1483 | /* If we have (plus (subreg (virtual-reg)) (const_int)), we know | |
1484 | we can commute the PLUS and SUBREG because pointers into the | |
1485 | frame are well-behaved. */ | |
1486 | break; | |
ce717ce4 | 1487 | |
b8704801 RS |
1488 | default: |
1489 | break; | |
1490 | } | |
1491 | } | |
6f086dfc | 1492 | } |
b8704801 | 1493 | return changed; |
6f086dfc RS |
1494 | } |
1495 | ||
bbf9b913 RH |
1496 | /* A subroutine of instantiate_virtual_regs_in_insn. Return true if X |
1497 | matches the predicate for insn CODE operand OPERAND. */ | |
6f086dfc | 1498 | |
bbf9b913 RH |
1499 | static int |
1500 | safe_insn_predicate (int code, int operand, rtx x) | |
6f086dfc | 1501 | { |
2ef6ce06 | 1502 | return code < 0 || insn_operand_matches ((enum insn_code) code, operand, x); |
bbf9b913 | 1503 | } |
5a73491b | 1504 | |
bbf9b913 RH |
1505 | /* A subroutine of instantiate_virtual_regs. Instantiate any virtual |
1506 | registers present inside of insn. The result will be a valid insn. */ | |
5a73491b RK |
1507 | |
1508 | static void | |
691fe203 | 1509 | instantiate_virtual_regs_in_insn (rtx_insn *insn) |
5a73491b | 1510 | { |
bbf9b913 RH |
1511 | HOST_WIDE_INT offset; |
1512 | int insn_code, i; | |
9325973e | 1513 | bool any_change = false; |
691fe203 DM |
1514 | rtx set, new_rtx, x; |
1515 | rtx_insn *seq; | |
32e66afd | 1516 | |
bbf9b913 RH |
1517 | /* There are some special cases to be handled first. */ |
1518 | set = single_set (insn); | |
1519 | if (set) | |
32e66afd | 1520 | { |
bbf9b913 RH |
1521 | /* We're allowed to assign to a virtual register. This is interpreted |
1522 | to mean that the underlying register gets assigned the inverse | |
1523 | transformation. This is used, for example, in the handling of | |
1524 | non-local gotos. */ | |
82d6e6fc KG |
1525 | new_rtx = instantiate_new_reg (SET_DEST (set), &offset); |
1526 | if (new_rtx) | |
bbf9b913 RH |
1527 | { |
1528 | start_sequence (); | |
32e66afd | 1529 | |
b8704801 | 1530 | instantiate_virtual_regs_in_rtx (&SET_SRC (set)); |
82d6e6fc | 1531 | x = simplify_gen_binary (PLUS, GET_MODE (new_rtx), SET_SRC (set), |
69a59f0f | 1532 | gen_int_mode (-offset, GET_MODE (new_rtx))); |
82d6e6fc KG |
1533 | x = force_operand (x, new_rtx); |
1534 | if (x != new_rtx) | |
1535 | emit_move_insn (new_rtx, x); | |
5a73491b | 1536 | |
bbf9b913 RH |
1537 | seq = get_insns (); |
1538 | end_sequence (); | |
5a73491b | 1539 | |
bbf9b913 RH |
1540 | emit_insn_before (seq, insn); |
1541 | delete_insn (insn); | |
1542 | return; | |
1543 | } | |
5a73491b | 1544 | |
bbf9b913 RH |
1545 | /* Handle a straight copy from a virtual register by generating a |
1546 | new add insn. The difference between this and falling through | |
1547 | to the generic case is avoiding a new pseudo and eliminating a | |
1548 | move insn in the initial rtl stream. */ | |
82d6e6fc KG |
1549 | new_rtx = instantiate_new_reg (SET_SRC (set), &offset); |
1550 | if (new_rtx && offset != 0 | |
bbf9b913 RH |
1551 | && REG_P (SET_DEST (set)) |
1552 | && REGNO (SET_DEST (set)) > LAST_VIRTUAL_REGISTER) | |
1553 | { | |
1554 | start_sequence (); | |
5a73491b | 1555 | |
2f1cd2eb RS |
1556 | x = expand_simple_binop (GET_MODE (SET_DEST (set)), PLUS, new_rtx, |
1557 | gen_int_mode (offset, | |
1558 | GET_MODE (SET_DEST (set))), | |
1559 | SET_DEST (set), 1, OPTAB_LIB_WIDEN); | |
bbf9b913 RH |
1560 | if (x != SET_DEST (set)) |
1561 | emit_move_insn (SET_DEST (set), x); | |
770ae6cc | 1562 | |
bbf9b913 RH |
1563 | seq = get_insns (); |
1564 | end_sequence (); | |
87ce34d6 | 1565 | |
bbf9b913 RH |
1566 | emit_insn_before (seq, insn); |
1567 | delete_insn (insn); | |
87ce34d6 | 1568 | return; |
bbf9b913 | 1569 | } |
5a73491b | 1570 | |
bbf9b913 | 1571 | extract_insn (insn); |
9325973e | 1572 | insn_code = INSN_CODE (insn); |
5a73491b | 1573 | |
bbf9b913 RH |
1574 | /* Handle a plus involving a virtual register by determining if the |
1575 | operands remain valid if they're modified in place. */ | |
1576 | if (GET_CODE (SET_SRC (set)) == PLUS | |
1577 | && recog_data.n_operands >= 3 | |
1578 | && recog_data.operand_loc[1] == &XEXP (SET_SRC (set), 0) | |
1579 | && recog_data.operand_loc[2] == &XEXP (SET_SRC (set), 1) | |
481683e1 | 1580 | && CONST_INT_P (recog_data.operand[2]) |
82d6e6fc | 1581 | && (new_rtx = instantiate_new_reg (recog_data.operand[1], &offset))) |
bbf9b913 RH |
1582 | { |
1583 | offset += INTVAL (recog_data.operand[2]); | |
5a73491b | 1584 | |
bbf9b913 | 1585 | /* If the sum is zero, then replace with a plain move. */ |
9325973e RH |
1586 | if (offset == 0 |
1587 | && REG_P (SET_DEST (set)) | |
1588 | && REGNO (SET_DEST (set)) > LAST_VIRTUAL_REGISTER) | |
bbf9b913 RH |
1589 | { |
1590 | start_sequence (); | |
82d6e6fc | 1591 | emit_move_insn (SET_DEST (set), new_rtx); |
bbf9b913 RH |
1592 | seq = get_insns (); |
1593 | end_sequence (); | |
d1405722 | 1594 | |
bbf9b913 RH |
1595 | emit_insn_before (seq, insn); |
1596 | delete_insn (insn); | |
1597 | return; | |
1598 | } | |
d1405722 | 1599 | |
bbf9b913 | 1600 | x = gen_int_mode (offset, recog_data.operand_mode[2]); |
bbf9b913 RH |
1601 | |
1602 | /* Using validate_change and apply_change_group here leaves | |
1603 | recog_data in an invalid state. Since we know exactly what | |
1604 | we want to check, do those two by hand. */ | |
82d6e6fc | 1605 | if (safe_insn_predicate (insn_code, 1, new_rtx) |
bbf9b913 RH |
1606 | && safe_insn_predicate (insn_code, 2, x)) |
1607 | { | |
82d6e6fc | 1608 | *recog_data.operand_loc[1] = recog_data.operand[1] = new_rtx; |
bbf9b913 RH |
1609 | *recog_data.operand_loc[2] = recog_data.operand[2] = x; |
1610 | any_change = true; | |
9325973e RH |
1611 | |
1612 | /* Fall through into the regular operand fixup loop in | |
1613 | order to take care of operands other than 1 and 2. */ | |
bbf9b913 RH |
1614 | } |
1615 | } | |
1616 | } | |
d1405722 | 1617 | else |
9325973e RH |
1618 | { |
1619 | extract_insn (insn); | |
1620 | insn_code = INSN_CODE (insn); | |
1621 | } | |
5dc96d60 | 1622 | |
bbf9b913 RH |
1623 | /* In the general case, we expect virtual registers to appear only in |
1624 | operands, and then only as either bare registers or inside memories. */ | |
1625 | for (i = 0; i < recog_data.n_operands; ++i) | |
1626 | { | |
1627 | x = recog_data.operand[i]; | |
1628 | switch (GET_CODE (x)) | |
1629 | { | |
1630 | case MEM: | |
1631 | { | |
1632 | rtx addr = XEXP (x, 0); | |
bbf9b913 | 1633 | |
b8704801 | 1634 | if (!instantiate_virtual_regs_in_rtx (&addr)) |
bbf9b913 RH |
1635 | continue; |
1636 | ||
1637 | start_sequence (); | |
23b33725 | 1638 | x = replace_equiv_address (x, addr, true); |
a5bfb13a MM |
1639 | /* It may happen that the address with the virtual reg |
1640 | was valid (e.g. based on the virtual stack reg, which might | |
1641 | be acceptable to the predicates with all offsets), whereas | |
1642 | the address now isn't anymore, for instance when the address | |
1643 | is still offsetted, but the base reg isn't virtual-stack-reg | |
1644 | anymore. Below we would do a force_reg on the whole operand, | |
1645 | but this insn might actually only accept memory. Hence, | |
1646 | before doing that last resort, try to reload the address into | |
1647 | a register, so this operand stays a MEM. */ | |
1648 | if (!safe_insn_predicate (insn_code, i, x)) | |
1649 | { | |
1650 | addr = force_reg (GET_MODE (addr), addr); | |
23b33725 | 1651 | x = replace_equiv_address (x, addr, true); |
a5bfb13a | 1652 | } |
bbf9b913 RH |
1653 | seq = get_insns (); |
1654 | end_sequence (); | |
1655 | if (seq) | |
1656 | emit_insn_before (seq, insn); | |
1657 | } | |
1658 | break; | |
1659 | ||
1660 | case REG: | |
82d6e6fc KG |
1661 | new_rtx = instantiate_new_reg (x, &offset); |
1662 | if (new_rtx == NULL) | |
bbf9b913 RH |
1663 | continue; |
1664 | if (offset == 0) | |
82d6e6fc | 1665 | x = new_rtx; |
bbf9b913 RH |
1666 | else |
1667 | { | |
1668 | start_sequence (); | |
6f086dfc | 1669 | |
bbf9b913 RH |
1670 | /* Careful, special mode predicates may have stuff in |
1671 | insn_data[insn_code].operand[i].mode that isn't useful | |
1672 | to us for computing a new value. */ | |
1673 | /* ??? Recognize address_operand and/or "p" constraints | |
1674 | to see if (plus new offset) is a valid before we put | |
1675 | this through expand_simple_binop. */ | |
82d6e6fc | 1676 | x = expand_simple_binop (GET_MODE (x), PLUS, new_rtx, |
2f1cd2eb RS |
1677 | gen_int_mode (offset, GET_MODE (x)), |
1678 | NULL_RTX, 1, OPTAB_LIB_WIDEN); | |
bbf9b913 RH |
1679 | seq = get_insns (); |
1680 | end_sequence (); | |
1681 | emit_insn_before (seq, insn); | |
1682 | } | |
1683 | break; | |
6f086dfc | 1684 | |
bbf9b913 | 1685 | case SUBREG: |
82d6e6fc KG |
1686 | new_rtx = instantiate_new_reg (SUBREG_REG (x), &offset); |
1687 | if (new_rtx == NULL) | |
bbf9b913 RH |
1688 | continue; |
1689 | if (offset != 0) | |
1690 | { | |
1691 | start_sequence (); | |
2f1cd2eb RS |
1692 | new_rtx = expand_simple_binop |
1693 | (GET_MODE (new_rtx), PLUS, new_rtx, | |
1694 | gen_int_mode (offset, GET_MODE (new_rtx)), | |
1695 | NULL_RTX, 1, OPTAB_LIB_WIDEN); | |
bbf9b913 RH |
1696 | seq = get_insns (); |
1697 | end_sequence (); | |
1698 | emit_insn_before (seq, insn); | |
1699 | } | |
82d6e6fc KG |
1700 | x = simplify_gen_subreg (recog_data.operand_mode[i], new_rtx, |
1701 | GET_MODE (new_rtx), SUBREG_BYTE (x)); | |
7314c7dd | 1702 | gcc_assert (x); |
bbf9b913 | 1703 | break; |
6f086dfc | 1704 | |
bbf9b913 RH |
1705 | default: |
1706 | continue; | |
1707 | } | |
6f086dfc | 1708 | |
bbf9b913 RH |
1709 | /* At this point, X contains the new value for the operand. |
1710 | Validate the new value vs the insn predicate. Note that | |
1711 | asm insns will have insn_code -1 here. */ | |
1712 | if (!safe_insn_predicate (insn_code, i, x)) | |
6ba1bd36 JM |
1713 | { |
1714 | start_sequence (); | |
f7ce0951 SE |
1715 | if (REG_P (x)) |
1716 | { | |
1717 | gcc_assert (REGNO (x) <= LAST_VIRTUAL_REGISTER); | |
1718 | x = copy_to_reg (x); | |
1719 | } | |
1720 | else | |
1721 | x = force_reg (insn_data[insn_code].operand[i].mode, x); | |
6ba1bd36 JM |
1722 | seq = get_insns (); |
1723 | end_sequence (); | |
1724 | if (seq) | |
1725 | emit_insn_before (seq, insn); | |
1726 | } | |
6f086dfc | 1727 | |
bbf9b913 RH |
1728 | *recog_data.operand_loc[i] = recog_data.operand[i] = x; |
1729 | any_change = true; | |
1730 | } | |
6f086dfc | 1731 | |
bbf9b913 RH |
1732 | if (any_change) |
1733 | { | |
1734 | /* Propagate operand changes into the duplicates. */ | |
1735 | for (i = 0; i < recog_data.n_dups; ++i) | |
1736 | *recog_data.dup_loc[i] | |
3e916873 | 1737 | = copy_rtx (recog_data.operand[(unsigned)recog_data.dup_num[i]]); |
5dc96d60 | 1738 | |
bbf9b913 RH |
1739 | /* Force re-recognition of the instruction for validation. */ |
1740 | INSN_CODE (insn) = -1; | |
1741 | } | |
6f086dfc | 1742 | |
bbf9b913 | 1743 | if (asm_noperands (PATTERN (insn)) >= 0) |
6f086dfc | 1744 | { |
bbf9b913 | 1745 | if (!check_asm_operands (PATTERN (insn))) |
6f086dfc | 1746 | { |
bbf9b913 | 1747 | error_for_asm (insn, "impossible constraint in %<asm%>"); |
5a860835 JJ |
1748 | /* For asm goto, instead of fixing up all the edges |
1749 | just clear the template and clear input operands | |
1750 | (asm goto doesn't have any output operands). */ | |
1751 | if (JUMP_P (insn)) | |
1752 | { | |
1753 | rtx asm_op = extract_asm_operands (PATTERN (insn)); | |
1754 | ASM_OPERANDS_TEMPLATE (asm_op) = ggc_strdup (""); | |
1755 | ASM_OPERANDS_INPUT_VEC (asm_op) = rtvec_alloc (0); | |
1756 | ASM_OPERANDS_INPUT_CONSTRAINT_VEC (asm_op) = rtvec_alloc (0); | |
1757 | } | |
1758 | else | |
1759 | delete_insn (insn); | |
bbf9b913 RH |
1760 | } |
1761 | } | |
1762 | else | |
1763 | { | |
1764 | if (recog_memoized (insn) < 0) | |
1765 | fatal_insn_not_found (insn); | |
1766 | } | |
1767 | } | |
14a774a9 | 1768 | |
bbf9b913 RH |
1769 | /* Subroutine of instantiate_decls. Given RTL representing a decl, |
1770 | do any instantiation required. */ | |
14a774a9 | 1771 | |
e41b2a33 PB |
1772 | void |
1773 | instantiate_decl_rtl (rtx x) | |
bbf9b913 RH |
1774 | { |
1775 | rtx addr; | |
6f086dfc | 1776 | |
bbf9b913 RH |
1777 | if (x == 0) |
1778 | return; | |
6f086dfc | 1779 | |
bbf9b913 RH |
1780 | /* If this is a CONCAT, recurse for the pieces. */ |
1781 | if (GET_CODE (x) == CONCAT) | |
1782 | { | |
e41b2a33 PB |
1783 | instantiate_decl_rtl (XEXP (x, 0)); |
1784 | instantiate_decl_rtl (XEXP (x, 1)); | |
bbf9b913 RH |
1785 | return; |
1786 | } | |
6f086dfc | 1787 | |
bbf9b913 RH |
1788 | /* If this is not a MEM, no need to do anything. Similarly if the |
1789 | address is a constant or a register that is not a virtual register. */ | |
1790 | if (!MEM_P (x)) | |
1791 | return; | |
6f086dfc | 1792 | |
bbf9b913 RH |
1793 | addr = XEXP (x, 0); |
1794 | if (CONSTANT_P (addr) | |
1795 | || (REG_P (addr) | |
1796 | && (REGNO (addr) < FIRST_VIRTUAL_REGISTER | |
1797 | || REGNO (addr) > LAST_VIRTUAL_REGISTER))) | |
1798 | return; | |
6f086dfc | 1799 | |
b8704801 | 1800 | instantiate_virtual_regs_in_rtx (&XEXP (x, 0)); |
bbf9b913 | 1801 | } |
6f086dfc | 1802 | |
434eba35 JJ |
1803 | /* Helper for instantiate_decls called via walk_tree: Process all decls |
1804 | in the given DECL_VALUE_EXPR. */ | |
1805 | ||
1806 | static tree | |
1807 | instantiate_expr (tree *tp, int *walk_subtrees, void *data ATTRIBUTE_UNUSED) | |
1808 | { | |
1809 | tree t = *tp; | |
726a989a | 1810 | if (! EXPR_P (t)) |
434eba35 JJ |
1811 | { |
1812 | *walk_subtrees = 0; | |
37d6a488 AO |
1813 | if (DECL_P (t)) |
1814 | { | |
1815 | if (DECL_RTL_SET_P (t)) | |
1816 | instantiate_decl_rtl (DECL_RTL (t)); | |
1817 | if (TREE_CODE (t) == PARM_DECL && DECL_NAMELESS (t) | |
1818 | && DECL_INCOMING_RTL (t)) | |
1819 | instantiate_decl_rtl (DECL_INCOMING_RTL (t)); | |
1820 | if ((TREE_CODE (t) == VAR_DECL | |
1821 | || TREE_CODE (t) == RESULT_DECL) | |
1822 | && DECL_HAS_VALUE_EXPR_P (t)) | |
1823 | { | |
1824 | tree v = DECL_VALUE_EXPR (t); | |
1825 | walk_tree (&v, instantiate_expr, NULL, NULL); | |
1826 | } | |
1827 | } | |
434eba35 JJ |
1828 | } |
1829 | return NULL; | |
1830 | } | |
1831 | ||
bbf9b913 RH |
1832 | /* Subroutine of instantiate_decls: Process all decls in the given |
1833 | BLOCK node and all its subblocks. */ | |
6f086dfc | 1834 | |
bbf9b913 RH |
1835 | static void |
1836 | instantiate_decls_1 (tree let) | |
1837 | { | |
1838 | tree t; | |
6f086dfc | 1839 | |
910ad8de | 1840 | for (t = BLOCK_VARS (let); t; t = DECL_CHAIN (t)) |
434eba35 JJ |
1841 | { |
1842 | if (DECL_RTL_SET_P (t)) | |
e41b2a33 | 1843 | instantiate_decl_rtl (DECL_RTL (t)); |
434eba35 JJ |
1844 | if (TREE_CODE (t) == VAR_DECL && DECL_HAS_VALUE_EXPR_P (t)) |
1845 | { | |
1846 | tree v = DECL_VALUE_EXPR (t); | |
1847 | walk_tree (&v, instantiate_expr, NULL, NULL); | |
1848 | } | |
1849 | } | |
6f086dfc | 1850 | |
bbf9b913 | 1851 | /* Process all subblocks. */ |
87caf699 | 1852 | for (t = BLOCK_SUBBLOCKS (let); t; t = BLOCK_CHAIN (t)) |
bbf9b913 RH |
1853 | instantiate_decls_1 (t); |
1854 | } | |
6f086dfc | 1855 | |
bbf9b913 RH |
1856 | /* Scan all decls in FNDECL (both variables and parameters) and instantiate |
1857 | all virtual registers in their DECL_RTL's. */ | |
6f086dfc | 1858 | |
bbf9b913 RH |
1859 | static void |
1860 | instantiate_decls (tree fndecl) | |
1861 | { | |
c021f10b NF |
1862 | tree decl; |
1863 | unsigned ix; | |
6f086dfc | 1864 | |
bbf9b913 | 1865 | /* Process all parameters of the function. */ |
910ad8de | 1866 | for (decl = DECL_ARGUMENTS (fndecl); decl; decl = DECL_CHAIN (decl)) |
bbf9b913 | 1867 | { |
e41b2a33 PB |
1868 | instantiate_decl_rtl (DECL_RTL (decl)); |
1869 | instantiate_decl_rtl (DECL_INCOMING_RTL (decl)); | |
434eba35 JJ |
1870 | if (DECL_HAS_VALUE_EXPR_P (decl)) |
1871 | { | |
1872 | tree v = DECL_VALUE_EXPR (decl); | |
1873 | walk_tree (&v, instantiate_expr, NULL, NULL); | |
1874 | } | |
bbf9b913 | 1875 | } |
4fd796bb | 1876 | |
37d6a488 AO |
1877 | if ((decl = DECL_RESULT (fndecl)) |
1878 | && TREE_CODE (decl) == RESULT_DECL) | |
1879 | { | |
1880 | if (DECL_RTL_SET_P (decl)) | |
1881 | instantiate_decl_rtl (DECL_RTL (decl)); | |
1882 | if (DECL_HAS_VALUE_EXPR_P (decl)) | |
1883 | { | |
1884 | tree v = DECL_VALUE_EXPR (decl); | |
1885 | walk_tree (&v, instantiate_expr, NULL, NULL); | |
1886 | } | |
1887 | } | |
1888 | ||
3fd48b12 EB |
1889 | /* Process the saved static chain if it exists. */ |
1890 | decl = DECL_STRUCT_FUNCTION (fndecl)->static_chain_decl; | |
1891 | if (decl && DECL_HAS_VALUE_EXPR_P (decl)) | |
1892 | instantiate_decl_rtl (DECL_RTL (DECL_VALUE_EXPR (decl))); | |
1893 | ||
bbf9b913 RH |
1894 | /* Now process all variables defined in the function or its subblocks. */ |
1895 | instantiate_decls_1 (DECL_INITIAL (fndecl)); | |
802e9f8e | 1896 | |
c021f10b NF |
1897 | FOR_EACH_LOCAL_DECL (cfun, ix, decl) |
1898 | if (DECL_RTL_SET_P (decl)) | |
1899 | instantiate_decl_rtl (DECL_RTL (decl)); | |
9771b263 | 1900 | vec_free (cfun->local_decls); |
bbf9b913 | 1901 | } |
6f086dfc | 1902 | |
bbf9b913 RH |
1903 | /* Pass through the INSNS of function FNDECL and convert virtual register |
1904 | references to hard register references. */ | |
6f086dfc | 1905 | |
c2924966 | 1906 | static unsigned int |
bbf9b913 RH |
1907 | instantiate_virtual_regs (void) |
1908 | { | |
691fe203 | 1909 | rtx_insn *insn; |
6f086dfc | 1910 | |
bbf9b913 RH |
1911 | /* Compute the offsets to use for this function. */ |
1912 | in_arg_offset = FIRST_PARM_OFFSET (current_function_decl); | |
1913 | var_offset = STARTING_FRAME_OFFSET; | |
1914 | dynamic_offset = STACK_DYNAMIC_OFFSET (current_function_decl); | |
1915 | out_arg_offset = STACK_POINTER_OFFSET; | |
f6672e8e RH |
1916 | #ifdef FRAME_POINTER_CFA_OFFSET |
1917 | cfa_offset = FRAME_POINTER_CFA_OFFSET (current_function_decl); | |
1918 | #else | |
bbf9b913 | 1919 | cfa_offset = ARG_POINTER_CFA_OFFSET (current_function_decl); |
f6672e8e | 1920 | #endif |
e9a25f70 | 1921 | |
bbf9b913 RH |
1922 | /* Initialize recognition, indicating that volatile is OK. */ |
1923 | init_recog (); | |
6f086dfc | 1924 | |
bbf9b913 RH |
1925 | /* Scan through all the insns, instantiating every virtual register still |
1926 | present. */ | |
45dbce1b NF |
1927 | for (insn = get_insns (); insn; insn = NEXT_INSN (insn)) |
1928 | if (INSN_P (insn)) | |
1929 | { | |
1930 | /* These patterns in the instruction stream can never be recognized. | |
1931 | Fortunately, they shouldn't contain virtual registers either. */ | |
39718607 | 1932 | if (GET_CODE (PATTERN (insn)) == USE |
45dbce1b | 1933 | || GET_CODE (PATTERN (insn)) == CLOBBER |
45dbce1b NF |
1934 | || GET_CODE (PATTERN (insn)) == ASM_INPUT) |
1935 | continue; | |
1936 | else if (DEBUG_INSN_P (insn)) | |
b8704801 | 1937 | instantiate_virtual_regs_in_rtx (&INSN_VAR_LOCATION (insn)); |
45dbce1b NF |
1938 | else |
1939 | instantiate_virtual_regs_in_insn (insn); | |
ba4807a0 | 1940 | |
4654c0cf | 1941 | if (insn->deleted ()) |
45dbce1b | 1942 | continue; |
7114321e | 1943 | |
b8704801 | 1944 | instantiate_virtual_regs_in_rtx (®_NOTES (insn)); |
ba4807a0 | 1945 | |
45dbce1b NF |
1946 | /* Instantiate any virtual registers in CALL_INSN_FUNCTION_USAGE. */ |
1947 | if (CALL_P (insn)) | |
b8704801 | 1948 | instantiate_virtual_regs_in_rtx (&CALL_INSN_FUNCTION_USAGE (insn)); |
45dbce1b | 1949 | } |
6f086dfc | 1950 | |
bbf9b913 RH |
1951 | /* Instantiate the virtual registers in the DECLs for debugging purposes. */ |
1952 | instantiate_decls (current_function_decl); | |
1953 | ||
e41b2a33 PB |
1954 | targetm.instantiate_decls (); |
1955 | ||
bbf9b913 RH |
1956 | /* Indicate that, from now on, assign_stack_local should use |
1957 | frame_pointer_rtx. */ | |
1958 | virtuals_instantiated = 1; | |
d3c12306 | 1959 | |
c2924966 | 1960 | return 0; |
6f086dfc | 1961 | } |
ef330312 | 1962 | |
27a4cd48 DM |
1963 | namespace { |
1964 | ||
1965 | const pass_data pass_data_instantiate_virtual_regs = | |
1966 | { | |
1967 | RTL_PASS, /* type */ | |
1968 | "vregs", /* name */ | |
1969 | OPTGROUP_NONE, /* optinfo_flags */ | |
27a4cd48 DM |
1970 | TV_NONE, /* tv_id */ |
1971 | 0, /* properties_required */ | |
1972 | 0, /* properties_provided */ | |
1973 | 0, /* properties_destroyed */ | |
1974 | 0, /* todo_flags_start */ | |
1975 | 0, /* todo_flags_finish */ | |
ef330312 PB |
1976 | }; |
1977 | ||
27a4cd48 DM |
1978 | class pass_instantiate_virtual_regs : public rtl_opt_pass |
1979 | { | |
1980 | public: | |
c3284718 RS |
1981 | pass_instantiate_virtual_regs (gcc::context *ctxt) |
1982 | : rtl_opt_pass (pass_data_instantiate_virtual_regs, ctxt) | |
27a4cd48 DM |
1983 | {} |
1984 | ||
1985 | /* opt_pass methods: */ | |
be55bfe6 TS |
1986 | virtual unsigned int execute (function *) |
1987 | { | |
1988 | return instantiate_virtual_regs (); | |
1989 | } | |
27a4cd48 DM |
1990 | |
1991 | }; // class pass_instantiate_virtual_regs | |
1992 | ||
1993 | } // anon namespace | |
1994 | ||
1995 | rtl_opt_pass * | |
1996 | make_pass_instantiate_virtual_regs (gcc::context *ctxt) | |
1997 | { | |
1998 | return new pass_instantiate_virtual_regs (ctxt); | |
1999 | } | |
2000 | ||
6f086dfc | 2001 | \f |
d181c154 RS |
2002 | /* Return 1 if EXP is an aggregate type (or a value with aggregate type). |
2003 | This means a type for which function calls must pass an address to the | |
2004 | function or get an address back from the function. | |
2005 | EXP may be a type node or an expression (whose type is tested). */ | |
6f086dfc RS |
2006 | |
2007 | int | |
586de218 | 2008 | aggregate_value_p (const_tree exp, const_tree fntype) |
6f086dfc | 2009 | { |
d47d0a8d | 2010 | const_tree type = (TYPE_P (exp)) ? exp : TREE_TYPE (exp); |
9d790a4f RS |
2011 | int i, regno, nregs; |
2012 | rtx reg; | |
2f939d94 | 2013 | |
61f71b34 DD |
2014 | if (fntype) |
2015 | switch (TREE_CODE (fntype)) | |
2016 | { | |
2017 | case CALL_EXPR: | |
d47d0a8d EB |
2018 | { |
2019 | tree fndecl = get_callee_fndecl (fntype); | |
2020 | fntype = (fndecl | |
2021 | ? TREE_TYPE (fndecl) | |
2022 | : TREE_TYPE (TREE_TYPE (CALL_EXPR_FN (fntype)))); | |
2023 | } | |
61f71b34 DD |
2024 | break; |
2025 | case FUNCTION_DECL: | |
d47d0a8d | 2026 | fntype = TREE_TYPE (fntype); |
61f71b34 DD |
2027 | break; |
2028 | case FUNCTION_TYPE: | |
2029 | case METHOD_TYPE: | |
2030 | break; | |
2031 | case IDENTIFIER_NODE: | |
d47d0a8d | 2032 | fntype = NULL_TREE; |
61f71b34 DD |
2033 | break; |
2034 | default: | |
d47d0a8d | 2035 | /* We don't expect other tree types here. */ |
0bccc606 | 2036 | gcc_unreachable (); |
61f71b34 DD |
2037 | } |
2038 | ||
d47d0a8d | 2039 | if (VOID_TYPE_P (type)) |
d7bf8ada | 2040 | return 0; |
500c353d | 2041 | |
ebf0bf7f JJ |
2042 | /* If a record should be passed the same as its first (and only) member |
2043 | don't pass it as an aggregate. */ | |
2044 | if (TREE_CODE (type) == RECORD_TYPE && TYPE_TRANSPARENT_AGGR (type)) | |
2045 | return aggregate_value_p (first_field (type), fntype); | |
2046 | ||
cc77ae10 JM |
2047 | /* If the front end has decided that this needs to be passed by |
2048 | reference, do so. */ | |
2049 | if ((TREE_CODE (exp) == PARM_DECL || TREE_CODE (exp) == RESULT_DECL) | |
2050 | && DECL_BY_REFERENCE (exp)) | |
2051 | return 1; | |
500c353d | 2052 | |
d47d0a8d EB |
2053 | /* Function types that are TREE_ADDRESSABLE force return in memory. */ |
2054 | if (fntype && TREE_ADDRESSABLE (fntype)) | |
500c353d | 2055 | return 1; |
b8698a0f | 2056 | |
956d6950 | 2057 | /* Types that are TREE_ADDRESSABLE must be constructed in memory, |
49a2e5b2 DE |
2058 | and thus can't be returned in registers. */ |
2059 | if (TREE_ADDRESSABLE (type)) | |
2060 | return 1; | |
d47d0a8d | 2061 | |
05e3bdb9 | 2062 | if (flag_pcc_struct_return && AGGREGATE_TYPE_P (type)) |
6f086dfc | 2063 | return 1; |
d47d0a8d EB |
2064 | |
2065 | if (targetm.calls.return_in_memory (type, fntype)) | |
2066 | return 1; | |
2067 | ||
9d790a4f RS |
2068 | /* Make sure we have suitable call-clobbered regs to return |
2069 | the value in; if not, we must return it in memory. */ | |
1d636cc6 | 2070 | reg = hard_function_value (type, 0, fntype, 0); |
e71f7aa5 JW |
2071 | |
2072 | /* If we have something other than a REG (e.g. a PARALLEL), then assume | |
2073 | it is OK. */ | |
f8cfc6aa | 2074 | if (!REG_P (reg)) |
e71f7aa5 JW |
2075 | return 0; |
2076 | ||
9d790a4f | 2077 | regno = REGNO (reg); |
66fd46b6 | 2078 | nregs = hard_regno_nregs[regno][TYPE_MODE (type)]; |
9d790a4f RS |
2079 | for (i = 0; i < nregs; i++) |
2080 | if (! call_used_regs[regno + i]) | |
2081 | return 1; | |
d47d0a8d | 2082 | |
6f086dfc RS |
2083 | return 0; |
2084 | } | |
2085 | \f | |
8fff4fc1 RH |
2086 | /* Return true if we should assign DECL a pseudo register; false if it |
2087 | should live on the local stack. */ | |
2088 | ||
2089 | bool | |
fa233e34 | 2090 | use_register_for_decl (const_tree decl) |
8fff4fc1 | 2091 | { |
c3284718 | 2092 | if (!targetm.calls.allocate_stack_slots_for_args ()) |
007e61c2 | 2093 | return true; |
b8698a0f | 2094 | |
8fff4fc1 RH |
2095 | /* Honor volatile. */ |
2096 | if (TREE_SIDE_EFFECTS (decl)) | |
2097 | return false; | |
2098 | ||
2099 | /* Honor addressability. */ | |
2100 | if (TREE_ADDRESSABLE (decl)) | |
2101 | return false; | |
2102 | ||
2103 | /* Only register-like things go in registers. */ | |
2104 | if (DECL_MODE (decl) == BLKmode) | |
2105 | return false; | |
2106 | ||
2107 | /* If -ffloat-store specified, don't put explicit float variables | |
2108 | into registers. */ | |
2109 | /* ??? This should be checked after DECL_ARTIFICIAL, but tree-ssa | |
2110 | propagates values across these stores, and it probably shouldn't. */ | |
2111 | if (flag_float_store && FLOAT_TYPE_P (TREE_TYPE (decl))) | |
2112 | return false; | |
2113 | ||
78e0d62b RH |
2114 | /* If we're not interested in tracking debugging information for |
2115 | this decl, then we can certainly put it in a register. */ | |
2116 | if (DECL_IGNORED_P (decl)) | |
8fff4fc1 RH |
2117 | return true; |
2118 | ||
d130d647 JJ |
2119 | if (optimize) |
2120 | return true; | |
2121 | ||
2122 | if (!DECL_REGISTER (decl)) | |
2123 | return false; | |
2124 | ||
2125 | switch (TREE_CODE (TREE_TYPE (decl))) | |
2126 | { | |
2127 | case RECORD_TYPE: | |
2128 | case UNION_TYPE: | |
2129 | case QUAL_UNION_TYPE: | |
2130 | /* When not optimizing, disregard register keyword for variables with | |
2131 | types containing methods, otherwise the methods won't be callable | |
2132 | from the debugger. */ | |
2133 | if (TYPE_METHODS (TREE_TYPE (decl))) | |
2134 | return false; | |
2135 | break; | |
2136 | default: | |
2137 | break; | |
2138 | } | |
2139 | ||
2140 | return true; | |
8fff4fc1 RH |
2141 | } |
2142 | ||
0976078c RH |
2143 | /* Return true if TYPE should be passed by invisible reference. */ |
2144 | ||
2145 | bool | |
ef4bddc2 | 2146 | pass_by_reference (CUMULATIVE_ARGS *ca, machine_mode mode, |
8cd5a4e0 | 2147 | tree type, bool named_arg) |
0976078c RH |
2148 | { |
2149 | if (type) | |
2150 | { | |
2151 | /* If this type contains non-trivial constructors, then it is | |
2152 | forbidden for the middle-end to create any new copies. */ | |
2153 | if (TREE_ADDRESSABLE (type)) | |
2154 | return true; | |
2155 | ||
d58247a3 RH |
2156 | /* GCC post 3.4 passes *all* variable sized types by reference. */ |
2157 | if (!TYPE_SIZE (type) || TREE_CODE (TYPE_SIZE (type)) != INTEGER_CST) | |
0976078c | 2158 | return true; |
ebf0bf7f JJ |
2159 | |
2160 | /* If a record type should be passed the same as its first (and only) | |
2161 | member, use the type and mode of that member. */ | |
2162 | if (TREE_CODE (type) == RECORD_TYPE && TYPE_TRANSPARENT_AGGR (type)) | |
2163 | { | |
2164 | type = TREE_TYPE (first_field (type)); | |
2165 | mode = TYPE_MODE (type); | |
2166 | } | |
0976078c RH |
2167 | } |
2168 | ||
d5cc9181 JR |
2169 | return targetm.calls.pass_by_reference (pack_cumulative_args (ca), mode, |
2170 | type, named_arg); | |
0976078c RH |
2171 | } |
2172 | ||
6cdd5672 RH |
2173 | /* Return true if TYPE, which is passed by reference, should be callee |
2174 | copied instead of caller copied. */ | |
2175 | ||
2176 | bool | |
ef4bddc2 | 2177 | reference_callee_copied (CUMULATIVE_ARGS *ca, machine_mode mode, |
6cdd5672 RH |
2178 | tree type, bool named_arg) |
2179 | { | |
2180 | if (type && TREE_ADDRESSABLE (type)) | |
2181 | return false; | |
d5cc9181 JR |
2182 | return targetm.calls.callee_copies (pack_cumulative_args (ca), mode, type, |
2183 | named_arg); | |
6cdd5672 RH |
2184 | } |
2185 | ||
6071dc7f RH |
2186 | /* Structures to communicate between the subroutines of assign_parms. |
2187 | The first holds data persistent across all parameters, the second | |
2188 | is cleared out for each parameter. */ | |
6f086dfc | 2189 | |
6071dc7f | 2190 | struct assign_parm_data_all |
6f086dfc | 2191 | { |
d5cc9181 JR |
2192 | /* When INIT_CUMULATIVE_ARGS gets revamped, allocating CUMULATIVE_ARGS |
2193 | should become a job of the target or otherwise encapsulated. */ | |
2194 | CUMULATIVE_ARGS args_so_far_v; | |
2195 | cumulative_args_t args_so_far; | |
6f086dfc | 2196 | struct args_size stack_args_size; |
6071dc7f RH |
2197 | tree function_result_decl; |
2198 | tree orig_fnargs; | |
7a688d52 DM |
2199 | rtx_insn *first_conversion_insn; |
2200 | rtx_insn *last_conversion_insn; | |
6071dc7f RH |
2201 | HOST_WIDE_INT pretend_args_size; |
2202 | HOST_WIDE_INT extra_pretend_bytes; | |
2203 | int reg_parm_stack_space; | |
2204 | }; | |
6f086dfc | 2205 | |
6071dc7f RH |
2206 | struct assign_parm_data_one |
2207 | { | |
2208 | tree nominal_type; | |
2209 | tree passed_type; | |
2210 | rtx entry_parm; | |
2211 | rtx stack_parm; | |
ef4bddc2 RS |
2212 | machine_mode nominal_mode; |
2213 | machine_mode passed_mode; | |
2214 | machine_mode promoted_mode; | |
6071dc7f RH |
2215 | struct locate_and_pad_arg_data locate; |
2216 | int partial; | |
2217 | BOOL_BITFIELD named_arg : 1; | |
6071dc7f RH |
2218 | BOOL_BITFIELD passed_pointer : 1; |
2219 | BOOL_BITFIELD on_stack : 1; | |
2220 | BOOL_BITFIELD loaded_in_reg : 1; | |
2221 | }; | |
ebb904cb | 2222 | |
6071dc7f | 2223 | /* A subroutine of assign_parms. Initialize ALL. */ |
6f086dfc | 2224 | |
6071dc7f RH |
2225 | static void |
2226 | assign_parms_initialize_all (struct assign_parm_data_all *all) | |
2227 | { | |
fc2f1f53 | 2228 | tree fntype ATTRIBUTE_UNUSED; |
6f086dfc | 2229 | |
6071dc7f RH |
2230 | memset (all, 0, sizeof (*all)); |
2231 | ||
2232 | fntype = TREE_TYPE (current_function_decl); | |
2233 | ||
2234 | #ifdef INIT_CUMULATIVE_INCOMING_ARGS | |
d5cc9181 | 2235 | INIT_CUMULATIVE_INCOMING_ARGS (all->args_so_far_v, fntype, NULL_RTX); |
6071dc7f | 2236 | #else |
d5cc9181 | 2237 | INIT_CUMULATIVE_ARGS (all->args_so_far_v, fntype, NULL_RTX, |
6071dc7f RH |
2238 | current_function_decl, -1); |
2239 | #endif | |
d5cc9181 | 2240 | all->args_so_far = pack_cumulative_args (&all->args_so_far_v); |
6071dc7f | 2241 | |
ddbb449f AM |
2242 | #ifdef INCOMING_REG_PARM_STACK_SPACE |
2243 | all->reg_parm_stack_space | |
2244 | = INCOMING_REG_PARM_STACK_SPACE (current_function_decl); | |
6071dc7f RH |
2245 | #endif |
2246 | } | |
6f086dfc | 2247 | |
6071dc7f RH |
2248 | /* If ARGS contains entries with complex types, split the entry into two |
2249 | entries of the component type. Return a new list of substitutions are | |
2250 | needed, else the old list. */ | |
2251 | ||
3b3f318a | 2252 | static void |
9771b263 | 2253 | split_complex_args (vec<tree> *args) |
6071dc7f | 2254 | { |
3b3f318a | 2255 | unsigned i; |
6071dc7f RH |
2256 | tree p; |
2257 | ||
9771b263 | 2258 | FOR_EACH_VEC_ELT (*args, i, p) |
6071dc7f RH |
2259 | { |
2260 | tree type = TREE_TYPE (p); | |
2261 | if (TREE_CODE (type) == COMPLEX_TYPE | |
2262 | && targetm.calls.split_complex_arg (type)) | |
2263 | { | |
2264 | tree decl; | |
2265 | tree subtype = TREE_TYPE (type); | |
6ccd356e | 2266 | bool addressable = TREE_ADDRESSABLE (p); |
6071dc7f RH |
2267 | |
2268 | /* Rewrite the PARM_DECL's type with its component. */ | |
3b3f318a | 2269 | p = copy_node (p); |
6071dc7f RH |
2270 | TREE_TYPE (p) = subtype; |
2271 | DECL_ARG_TYPE (p) = TREE_TYPE (DECL_ARG_TYPE (p)); | |
2272 | DECL_MODE (p) = VOIDmode; | |
2273 | DECL_SIZE (p) = NULL; | |
2274 | DECL_SIZE_UNIT (p) = NULL; | |
6ccd356e AM |
2275 | /* If this arg must go in memory, put it in a pseudo here. |
2276 | We can't allow it to go in memory as per normal parms, | |
2277 | because the usual place might not have the imag part | |
2278 | adjacent to the real part. */ | |
2279 | DECL_ARTIFICIAL (p) = addressable; | |
2280 | DECL_IGNORED_P (p) = addressable; | |
2281 | TREE_ADDRESSABLE (p) = 0; | |
6071dc7f | 2282 | layout_decl (p, 0); |
9771b263 | 2283 | (*args)[i] = p; |
6071dc7f RH |
2284 | |
2285 | /* Build a second synthetic decl. */ | |
c2255bc4 AH |
2286 | decl = build_decl (EXPR_LOCATION (p), |
2287 | PARM_DECL, NULL_TREE, subtype); | |
6071dc7f | 2288 | DECL_ARG_TYPE (decl) = DECL_ARG_TYPE (p); |
6ccd356e AM |
2289 | DECL_ARTIFICIAL (decl) = addressable; |
2290 | DECL_IGNORED_P (decl) = addressable; | |
6071dc7f | 2291 | layout_decl (decl, 0); |
9771b263 | 2292 | args->safe_insert (++i, decl); |
6071dc7f RH |
2293 | } |
2294 | } | |
6071dc7f RH |
2295 | } |
2296 | ||
2297 | /* A subroutine of assign_parms. Adjust the parameter list to incorporate | |
2298 | the hidden struct return argument, and (abi willing) complex args. | |
2299 | Return the new parameter list. */ | |
2300 | ||
9771b263 | 2301 | static vec<tree> |
6071dc7f RH |
2302 | assign_parms_augmented_arg_list (struct assign_parm_data_all *all) |
2303 | { | |
2304 | tree fndecl = current_function_decl; | |
2305 | tree fntype = TREE_TYPE (fndecl); | |
6e1aa848 | 2306 | vec<tree> fnargs = vNULL; |
3b3f318a RG |
2307 | tree arg; |
2308 | ||
910ad8de | 2309 | for (arg = DECL_ARGUMENTS (fndecl); arg; arg = DECL_CHAIN (arg)) |
9771b263 | 2310 | fnargs.safe_push (arg); |
3b3f318a RG |
2311 | |
2312 | all->orig_fnargs = DECL_ARGUMENTS (fndecl); | |
6f086dfc RS |
2313 | |
2314 | /* If struct value address is treated as the first argument, make it so. */ | |
61f71b34 | 2315 | if (aggregate_value_p (DECL_RESULT (fndecl), fndecl) |
e3b5732b | 2316 | && ! cfun->returns_pcc_struct |
61f71b34 | 2317 | && targetm.calls.struct_value_rtx (TREE_TYPE (fndecl), 1) == 0) |
6f086dfc | 2318 | { |
f9f29478 | 2319 | tree type = build_pointer_type (TREE_TYPE (fntype)); |
6071dc7f | 2320 | tree decl; |
6f086dfc | 2321 | |
c2255bc4 | 2322 | decl = build_decl (DECL_SOURCE_LOCATION (fndecl), |
8dcfef8f | 2323 | PARM_DECL, get_identifier (".result_ptr"), type); |
6071dc7f RH |
2324 | DECL_ARG_TYPE (decl) = type; |
2325 | DECL_ARTIFICIAL (decl) = 1; | |
8dcfef8f AO |
2326 | DECL_NAMELESS (decl) = 1; |
2327 | TREE_CONSTANT (decl) = 1; | |
6f086dfc | 2328 | |
910ad8de | 2329 | DECL_CHAIN (decl) = all->orig_fnargs; |
3b3f318a | 2330 | all->orig_fnargs = decl; |
9771b263 | 2331 | fnargs.safe_insert (0, decl); |
3b3f318a | 2332 | |
6071dc7f | 2333 | all->function_result_decl = decl; |
6f086dfc | 2334 | } |
718fe406 | 2335 | |
42ba5130 RH |
2336 | /* If the target wants to split complex arguments into scalars, do so. */ |
2337 | if (targetm.calls.split_complex_arg) | |
3b3f318a | 2338 | split_complex_args (&fnargs); |
ded9bf77 | 2339 | |
6071dc7f RH |
2340 | return fnargs; |
2341 | } | |
e7949876 | 2342 | |
6071dc7f RH |
2343 | /* A subroutine of assign_parms. Examine PARM and pull out type and mode |
2344 | data for the parameter. Incorporate ABI specifics such as pass-by- | |
2345 | reference and type promotion. */ | |
6f086dfc | 2346 | |
6071dc7f RH |
2347 | static void |
2348 | assign_parm_find_data_types (struct assign_parm_data_all *all, tree parm, | |
2349 | struct assign_parm_data_one *data) | |
2350 | { | |
2351 | tree nominal_type, passed_type; | |
ef4bddc2 | 2352 | machine_mode nominal_mode, passed_mode, promoted_mode; |
cde0f3fd | 2353 | int unsignedp; |
6f086dfc | 2354 | |
6071dc7f RH |
2355 | memset (data, 0, sizeof (*data)); |
2356 | ||
fa10beec | 2357 | /* NAMED_ARG is a misnomer. We really mean 'non-variadic'. */ |
e3b5732b | 2358 | if (!cfun->stdarg) |
fa10beec | 2359 | data->named_arg = 1; /* No variadic parms. */ |
910ad8de | 2360 | else if (DECL_CHAIN (parm)) |
fa10beec | 2361 | data->named_arg = 1; /* Not the last non-variadic parm. */ |
d5cc9181 | 2362 | else if (targetm.calls.strict_argument_naming (all->args_so_far)) |
fa10beec | 2363 | data->named_arg = 1; /* Only variadic ones are unnamed. */ |
6071dc7f | 2364 | else |
fa10beec | 2365 | data->named_arg = 0; /* Treat as variadic. */ |
6071dc7f RH |
2366 | |
2367 | nominal_type = TREE_TYPE (parm); | |
2368 | passed_type = DECL_ARG_TYPE (parm); | |
2369 | ||
2370 | /* Look out for errors propagating this far. Also, if the parameter's | |
2371 | type is void then its value doesn't matter. */ | |
2372 | if (TREE_TYPE (parm) == error_mark_node | |
2373 | /* This can happen after weird syntax errors | |
2374 | or if an enum type is defined among the parms. */ | |
2375 | || TREE_CODE (parm) != PARM_DECL | |
2376 | || passed_type == NULL | |
2377 | || VOID_TYPE_P (nominal_type)) | |
2378 | { | |
2379 | nominal_type = passed_type = void_type_node; | |
2380 | nominal_mode = passed_mode = promoted_mode = VOIDmode; | |
2381 | goto egress; | |
2382 | } | |
108b7d3d | 2383 | |
6071dc7f RH |
2384 | /* Find mode of arg as it is passed, and mode of arg as it should be |
2385 | during execution of this function. */ | |
2386 | passed_mode = TYPE_MODE (passed_type); | |
2387 | nominal_mode = TYPE_MODE (nominal_type); | |
2388 | ||
ebf0bf7f JJ |
2389 | /* If the parm is to be passed as a transparent union or record, use the |
2390 | type of the first field for the tests below. We have already verified | |
2391 | that the modes are the same. */ | |
2392 | if ((TREE_CODE (passed_type) == UNION_TYPE | |
2393 | || TREE_CODE (passed_type) == RECORD_TYPE) | |
2394 | && TYPE_TRANSPARENT_AGGR (passed_type)) | |
2395 | passed_type = TREE_TYPE (first_field (passed_type)); | |
6071dc7f | 2396 | |
0976078c | 2397 | /* See if this arg was passed by invisible reference. */ |
d5cc9181 | 2398 | if (pass_by_reference (&all->args_so_far_v, passed_mode, |
0976078c | 2399 | passed_type, data->named_arg)) |
6071dc7f RH |
2400 | { |
2401 | passed_type = nominal_type = build_pointer_type (passed_type); | |
2402 | data->passed_pointer = true; | |
fd91cfe3 | 2403 | passed_mode = nominal_mode = TYPE_MODE (nominal_type); |
6071dc7f | 2404 | } |
6f086dfc | 2405 | |
6071dc7f | 2406 | /* Find mode as it is passed by the ABI. */ |
cde0f3fd PB |
2407 | unsignedp = TYPE_UNSIGNED (passed_type); |
2408 | promoted_mode = promote_function_mode (passed_type, passed_mode, &unsignedp, | |
2409 | TREE_TYPE (current_function_decl), 0); | |
6f086dfc | 2410 | |
6071dc7f RH |
2411 | egress: |
2412 | data->nominal_type = nominal_type; | |
2413 | data->passed_type = passed_type; | |
2414 | data->nominal_mode = nominal_mode; | |
2415 | data->passed_mode = passed_mode; | |
2416 | data->promoted_mode = promoted_mode; | |
2417 | } | |
16bae307 | 2418 | |
6071dc7f | 2419 | /* A subroutine of assign_parms. Invoke setup_incoming_varargs. */ |
6f086dfc | 2420 | |
6071dc7f RH |
2421 | static void |
2422 | assign_parms_setup_varargs (struct assign_parm_data_all *all, | |
2423 | struct assign_parm_data_one *data, bool no_rtl) | |
2424 | { | |
2425 | int varargs_pretend_bytes = 0; | |
2426 | ||
d5cc9181 | 2427 | targetm.calls.setup_incoming_varargs (all->args_so_far, |
6071dc7f RH |
2428 | data->promoted_mode, |
2429 | data->passed_type, | |
2430 | &varargs_pretend_bytes, no_rtl); | |
2431 | ||
2432 | /* If the back-end has requested extra stack space, record how much is | |
2433 | needed. Do not change pretend_args_size otherwise since it may be | |
2434 | nonzero from an earlier partial argument. */ | |
2435 | if (varargs_pretend_bytes > 0) | |
2436 | all->pretend_args_size = varargs_pretend_bytes; | |
2437 | } | |
a53e14c0 | 2438 | |
6071dc7f RH |
2439 | /* A subroutine of assign_parms. Set DATA->ENTRY_PARM corresponding to |
2440 | the incoming location of the current parameter. */ | |
2441 | ||
2442 | static void | |
2443 | assign_parm_find_entry_rtl (struct assign_parm_data_all *all, | |
2444 | struct assign_parm_data_one *data) | |
2445 | { | |
2446 | HOST_WIDE_INT pretend_bytes = 0; | |
2447 | rtx entry_parm; | |
2448 | bool in_regs; | |
2449 | ||
2450 | if (data->promoted_mode == VOIDmode) | |
2451 | { | |
2452 | data->entry_parm = data->stack_parm = const0_rtx; | |
2453 | return; | |
2454 | } | |
a53e14c0 | 2455 | |
d5cc9181 | 2456 | entry_parm = targetm.calls.function_incoming_arg (all->args_so_far, |
3c07301f NF |
2457 | data->promoted_mode, |
2458 | data->passed_type, | |
2459 | data->named_arg); | |
6f086dfc | 2460 | |
6071dc7f RH |
2461 | if (entry_parm == 0) |
2462 | data->promoted_mode = data->passed_mode; | |
6f086dfc | 2463 | |
6071dc7f RH |
2464 | /* Determine parm's home in the stack, in case it arrives in the stack |
2465 | or we should pretend it did. Compute the stack position and rtx where | |
2466 | the argument arrives and its size. | |
6f086dfc | 2467 | |
6071dc7f RH |
2468 | There is one complexity here: If this was a parameter that would |
2469 | have been passed in registers, but wasn't only because it is | |
2470 | __builtin_va_alist, we want locate_and_pad_parm to treat it as if | |
2471 | it came in a register so that REG_PARM_STACK_SPACE isn't skipped. | |
2472 | In this case, we call FUNCTION_ARG with NAMED set to 1 instead of 0 | |
2473 | as it was the previous time. */ | |
2474 | in_regs = entry_parm != 0; | |
6f086dfc | 2475 | #ifdef STACK_PARMS_IN_REG_PARM_AREA |
6071dc7f | 2476 | in_regs = true; |
e7949876 | 2477 | #endif |
6071dc7f RH |
2478 | if (!in_regs && !data->named_arg) |
2479 | { | |
d5cc9181 | 2480 | if (targetm.calls.pretend_outgoing_varargs_named (all->args_so_far)) |
e7949876 | 2481 | { |
6071dc7f | 2482 | rtx tem; |
d5cc9181 | 2483 | tem = targetm.calls.function_incoming_arg (all->args_so_far, |
3c07301f NF |
2484 | data->promoted_mode, |
2485 | data->passed_type, true); | |
6071dc7f | 2486 | in_regs = tem != NULL; |
e7949876 | 2487 | } |
6071dc7f | 2488 | } |
e7949876 | 2489 | |
6071dc7f RH |
2490 | /* If this parameter was passed both in registers and in the stack, use |
2491 | the copy on the stack. */ | |
fe984136 RH |
2492 | if (targetm.calls.must_pass_in_stack (data->promoted_mode, |
2493 | data->passed_type)) | |
6071dc7f | 2494 | entry_parm = 0; |
e7949876 | 2495 | |
6071dc7f RH |
2496 | if (entry_parm) |
2497 | { | |
2498 | int partial; | |
2499 | ||
d5cc9181 | 2500 | partial = targetm.calls.arg_partial_bytes (all->args_so_far, |
78a52f11 RH |
2501 | data->promoted_mode, |
2502 | data->passed_type, | |
2503 | data->named_arg); | |
6071dc7f RH |
2504 | data->partial = partial; |
2505 | ||
2506 | /* The caller might already have allocated stack space for the | |
2507 | register parameters. */ | |
2508 | if (partial != 0 && all->reg_parm_stack_space == 0) | |
975f3818 | 2509 | { |
6071dc7f RH |
2510 | /* Part of this argument is passed in registers and part |
2511 | is passed on the stack. Ask the prologue code to extend | |
2512 | the stack part so that we can recreate the full value. | |
2513 | ||
2514 | PRETEND_BYTES is the size of the registers we need to store. | |
2515 | CURRENT_FUNCTION_PRETEND_ARGS_SIZE is the amount of extra | |
2516 | stack space that the prologue should allocate. | |
2517 | ||
2518 | Internally, gcc assumes that the argument pointer is aligned | |
2519 | to STACK_BOUNDARY bits. This is used both for alignment | |
2520 | optimizations (see init_emit) and to locate arguments that are | |
2521 | aligned to more than PARM_BOUNDARY bits. We must preserve this | |
2522 | invariant by rounding CURRENT_FUNCTION_PRETEND_ARGS_SIZE up to | |
2523 | a stack boundary. */ | |
2524 | ||
2525 | /* We assume at most one partial arg, and it must be the first | |
2526 | argument on the stack. */ | |
0bccc606 | 2527 | gcc_assert (!all->extra_pretend_bytes && !all->pretend_args_size); |
6071dc7f | 2528 | |
78a52f11 | 2529 | pretend_bytes = partial; |
6071dc7f RH |
2530 | all->pretend_args_size = CEIL_ROUND (pretend_bytes, STACK_BYTES); |
2531 | ||
2532 | /* We want to align relative to the actual stack pointer, so | |
2533 | don't include this in the stack size until later. */ | |
2534 | all->extra_pretend_bytes = all->pretend_args_size; | |
975f3818 | 2535 | } |
6071dc7f | 2536 | } |
e7949876 | 2537 | |
6071dc7f | 2538 | locate_and_pad_parm (data->promoted_mode, data->passed_type, in_regs, |
2e4ceca5 | 2539 | all->reg_parm_stack_space, |
6071dc7f RH |
2540 | entry_parm ? data->partial : 0, current_function_decl, |
2541 | &all->stack_args_size, &data->locate); | |
6f086dfc | 2542 | |
e94a448f L |
2543 | /* Update parm_stack_boundary if this parameter is passed in the |
2544 | stack. */ | |
2545 | if (!in_regs && crtl->parm_stack_boundary < data->locate.boundary) | |
2546 | crtl->parm_stack_boundary = data->locate.boundary; | |
2547 | ||
6071dc7f RH |
2548 | /* Adjust offsets to include the pretend args. */ |
2549 | pretend_bytes = all->extra_pretend_bytes - pretend_bytes; | |
2550 | data->locate.slot_offset.constant += pretend_bytes; | |
2551 | data->locate.offset.constant += pretend_bytes; | |
ebca59c3 | 2552 | |
6071dc7f RH |
2553 | data->entry_parm = entry_parm; |
2554 | } | |
6f086dfc | 2555 | |
6071dc7f RH |
2556 | /* A subroutine of assign_parms. If there is actually space on the stack |
2557 | for this parm, count it in stack_args_size and return true. */ | |
6f086dfc | 2558 | |
6071dc7f RH |
2559 | static bool |
2560 | assign_parm_is_stack_parm (struct assign_parm_data_all *all, | |
2561 | struct assign_parm_data_one *data) | |
2562 | { | |
2e6ae27f | 2563 | /* Trivially true if we've no incoming register. */ |
6071dc7f RH |
2564 | if (data->entry_parm == NULL) |
2565 | ; | |
2566 | /* Also true if we're partially in registers and partially not, | |
2567 | since we've arranged to drop the entire argument on the stack. */ | |
2568 | else if (data->partial != 0) | |
2569 | ; | |
2570 | /* Also true if the target says that it's passed in both registers | |
2571 | and on the stack. */ | |
2572 | else if (GET_CODE (data->entry_parm) == PARALLEL | |
2573 | && XEXP (XVECEXP (data->entry_parm, 0, 0), 0) == NULL_RTX) | |
2574 | ; | |
2575 | /* Also true if the target says that there's stack allocated for | |
2576 | all register parameters. */ | |
2577 | else if (all->reg_parm_stack_space > 0) | |
2578 | ; | |
2579 | /* Otherwise, no, this parameter has no ABI defined stack slot. */ | |
2580 | else | |
2581 | return false; | |
6f086dfc | 2582 | |
6071dc7f RH |
2583 | all->stack_args_size.constant += data->locate.size.constant; |
2584 | if (data->locate.size.var) | |
2585 | ADD_PARM_SIZE (all->stack_args_size, data->locate.size.var); | |
718fe406 | 2586 | |
6071dc7f RH |
2587 | return true; |
2588 | } | |
0d1416c6 | 2589 | |
6071dc7f RH |
2590 | /* A subroutine of assign_parms. Given that this parameter is allocated |
2591 | stack space by the ABI, find it. */ | |
6f086dfc | 2592 | |
6071dc7f RH |
2593 | static void |
2594 | assign_parm_find_stack_rtl (tree parm, struct assign_parm_data_one *data) | |
2595 | { | |
2596 | rtx offset_rtx, stack_parm; | |
2597 | unsigned int align, boundary; | |
6f086dfc | 2598 | |
6071dc7f RH |
2599 | /* If we're passing this arg using a reg, make its stack home the |
2600 | aligned stack slot. */ | |
2601 | if (data->entry_parm) | |
2602 | offset_rtx = ARGS_SIZE_RTX (data->locate.slot_offset); | |
2603 | else | |
2604 | offset_rtx = ARGS_SIZE_RTX (data->locate.offset); | |
2605 | ||
38173d38 | 2606 | stack_parm = crtl->args.internal_arg_pointer; |
6071dc7f RH |
2607 | if (offset_rtx != const0_rtx) |
2608 | stack_parm = gen_rtx_PLUS (Pmode, stack_parm, offset_rtx); | |
2609 | stack_parm = gen_rtx_MEM (data->promoted_mode, stack_parm); | |
2610 | ||
08ab0acf | 2611 | if (!data->passed_pointer) |
997f78fb | 2612 | { |
08ab0acf JJ |
2613 | set_mem_attributes (stack_parm, parm, 1); |
2614 | /* set_mem_attributes could set MEM_SIZE to the passed mode's size, | |
2615 | while promoted mode's size is needed. */ | |
2616 | if (data->promoted_mode != BLKmode | |
2617 | && data->promoted_mode != DECL_MODE (parm)) | |
997f78fb | 2618 | { |
f5541398 | 2619 | set_mem_size (stack_parm, GET_MODE_SIZE (data->promoted_mode)); |
527210c4 | 2620 | if (MEM_EXPR (stack_parm) && MEM_OFFSET_KNOWN_P (stack_parm)) |
08ab0acf JJ |
2621 | { |
2622 | int offset = subreg_lowpart_offset (DECL_MODE (parm), | |
2623 | data->promoted_mode); | |
2624 | if (offset) | |
527210c4 | 2625 | set_mem_offset (stack_parm, MEM_OFFSET (stack_parm) - offset); |
08ab0acf | 2626 | } |
997f78fb JJ |
2627 | } |
2628 | } | |
6071dc7f | 2629 | |
bfc45551 AM |
2630 | boundary = data->locate.boundary; |
2631 | align = BITS_PER_UNIT; | |
6071dc7f RH |
2632 | |
2633 | /* If we're padding upward, we know that the alignment of the slot | |
c2ed6cf8 | 2634 | is TARGET_FUNCTION_ARG_BOUNDARY. If we're using slot_offset, we're |
6071dc7f RH |
2635 | intentionally forcing upward padding. Otherwise we have to come |
2636 | up with a guess at the alignment based on OFFSET_RTX. */ | |
bfc45551 | 2637 | if (data->locate.where_pad != downward || data->entry_parm) |
6071dc7f | 2638 | align = boundary; |
481683e1 | 2639 | else if (CONST_INT_P (offset_rtx)) |
6071dc7f RH |
2640 | { |
2641 | align = INTVAL (offset_rtx) * BITS_PER_UNIT | boundary; | |
2642 | align = align & -align; | |
2643 | } | |
bfc45551 | 2644 | set_mem_align (stack_parm, align); |
6071dc7f RH |
2645 | |
2646 | if (data->entry_parm) | |
2647 | set_reg_attrs_for_parm (data->entry_parm, stack_parm); | |
2648 | ||
2649 | data->stack_parm = stack_parm; | |
2650 | } | |
2651 | ||
2652 | /* A subroutine of assign_parms. Adjust DATA->ENTRY_RTL such that it's | |
2653 | always valid and contiguous. */ | |
2654 | ||
2655 | static void | |
2656 | assign_parm_adjust_entry_rtl (struct assign_parm_data_one *data) | |
2657 | { | |
2658 | rtx entry_parm = data->entry_parm; | |
2659 | rtx stack_parm = data->stack_parm; | |
2660 | ||
2661 | /* If this parm was passed part in regs and part in memory, pretend it | |
2662 | arrived entirely in memory by pushing the register-part onto the stack. | |
2663 | In the special case of a DImode or DFmode that is split, we could put | |
2664 | it together in a pseudoreg directly, but for now that's not worth | |
2665 | bothering with. */ | |
2666 | if (data->partial != 0) | |
2667 | { | |
2668 | /* Handle calls that pass values in multiple non-contiguous | |
2669 | locations. The Irix 6 ABI has examples of this. */ | |
2670 | if (GET_CODE (entry_parm) == PARALLEL) | |
1a8cb155 | 2671 | emit_group_store (validize_mem (copy_rtx (stack_parm)), entry_parm, |
b8698a0f | 2672 | data->passed_type, |
6071dc7f | 2673 | int_size_in_bytes (data->passed_type)); |
6f086dfc | 2674 | else |
78a52f11 RH |
2675 | { |
2676 | gcc_assert (data->partial % UNITS_PER_WORD == 0); | |
1a8cb155 RS |
2677 | move_block_from_reg (REGNO (entry_parm), |
2678 | validize_mem (copy_rtx (stack_parm)), | |
78a52f11 RH |
2679 | data->partial / UNITS_PER_WORD); |
2680 | } | |
6f086dfc | 2681 | |
6071dc7f RH |
2682 | entry_parm = stack_parm; |
2683 | } | |
6f086dfc | 2684 | |
6071dc7f RH |
2685 | /* If we didn't decide this parm came in a register, by default it came |
2686 | on the stack. */ | |
2687 | else if (entry_parm == NULL) | |
2688 | entry_parm = stack_parm; | |
2689 | ||
2690 | /* When an argument is passed in multiple locations, we can't make use | |
2691 | of this information, but we can save some copying if the whole argument | |
2692 | is passed in a single register. */ | |
2693 | else if (GET_CODE (entry_parm) == PARALLEL | |
2694 | && data->nominal_mode != BLKmode | |
2695 | && data->passed_mode != BLKmode) | |
2696 | { | |
2697 | size_t i, len = XVECLEN (entry_parm, 0); | |
2698 | ||
2699 | for (i = 0; i < len; i++) | |
2700 | if (XEXP (XVECEXP (entry_parm, 0, i), 0) != NULL_RTX | |
2701 | && REG_P (XEXP (XVECEXP (entry_parm, 0, i), 0)) | |
2702 | && (GET_MODE (XEXP (XVECEXP (entry_parm, 0, i), 0)) | |
2703 | == data->passed_mode) | |
2704 | && INTVAL (XEXP (XVECEXP (entry_parm, 0, i), 1)) == 0) | |
2705 | { | |
2706 | entry_parm = XEXP (XVECEXP (entry_parm, 0, i), 0); | |
2707 | break; | |
2708 | } | |
2709 | } | |
e68a6ce1 | 2710 | |
6071dc7f RH |
2711 | data->entry_parm = entry_parm; |
2712 | } | |
6f086dfc | 2713 | |
4d2a9850 DJ |
2714 | /* A subroutine of assign_parms. Reconstitute any values which were |
2715 | passed in multiple registers and would fit in a single register. */ | |
2716 | ||
2717 | static void | |
2718 | assign_parm_remove_parallels (struct assign_parm_data_one *data) | |
2719 | { | |
2720 | rtx entry_parm = data->entry_parm; | |
2721 | ||
2722 | /* Convert the PARALLEL to a REG of the same mode as the parallel. | |
2723 | This can be done with register operations rather than on the | |
2724 | stack, even if we will store the reconstituted parameter on the | |
2725 | stack later. */ | |
85776d60 | 2726 | if (GET_CODE (entry_parm) == PARALLEL && GET_MODE (entry_parm) != BLKmode) |
4d2a9850 DJ |
2727 | { |
2728 | rtx parmreg = gen_reg_rtx (GET_MODE (entry_parm)); | |
bbd46fd5 | 2729 | emit_group_store (parmreg, entry_parm, data->passed_type, |
4d2a9850 DJ |
2730 | GET_MODE_SIZE (GET_MODE (entry_parm))); |
2731 | entry_parm = parmreg; | |
2732 | } | |
2733 | ||
2734 | data->entry_parm = entry_parm; | |
2735 | } | |
2736 | ||
6071dc7f RH |
2737 | /* A subroutine of assign_parms. Adjust DATA->STACK_RTL such that it's |
2738 | always valid and properly aligned. */ | |
6f086dfc | 2739 | |
6071dc7f RH |
2740 | static void |
2741 | assign_parm_adjust_stack_rtl (struct assign_parm_data_one *data) | |
2742 | { | |
2743 | rtx stack_parm = data->stack_parm; | |
2744 | ||
2745 | /* If we can't trust the parm stack slot to be aligned enough for its | |
2746 | ultimate type, don't use that slot after entry. We'll make another | |
2747 | stack slot, if we need one. */ | |
bfc45551 AM |
2748 | if (stack_parm |
2749 | && ((STRICT_ALIGNMENT | |
2750 | && GET_MODE_ALIGNMENT (data->nominal_mode) > MEM_ALIGN (stack_parm)) | |
2751 | || (data->nominal_type | |
2752 | && TYPE_ALIGN (data->nominal_type) > MEM_ALIGN (stack_parm) | |
2753 | && MEM_ALIGN (stack_parm) < PREFERRED_STACK_BOUNDARY))) | |
6071dc7f RH |
2754 | stack_parm = NULL; |
2755 | ||
2756 | /* If parm was passed in memory, and we need to convert it on entry, | |
2757 | don't store it back in that same slot. */ | |
2758 | else if (data->entry_parm == stack_parm | |
2759 | && data->nominal_mode != BLKmode | |
2760 | && data->nominal_mode != data->passed_mode) | |
2761 | stack_parm = NULL; | |
2762 | ||
7d69de61 RH |
2763 | /* If stack protection is in effect for this function, don't leave any |
2764 | pointers in their passed stack slots. */ | |
cb91fab0 | 2765 | else if (crtl->stack_protect_guard |
7d69de61 RH |
2766 | && (flag_stack_protect == 2 |
2767 | || data->passed_pointer | |
2768 | || POINTER_TYPE_P (data->nominal_type))) | |
2769 | stack_parm = NULL; | |
2770 | ||
6071dc7f RH |
2771 | data->stack_parm = stack_parm; |
2772 | } | |
a0506b54 | 2773 | |
6071dc7f RH |
2774 | /* A subroutine of assign_parms. Return true if the current parameter |
2775 | should be stored as a BLKmode in the current frame. */ | |
2776 | ||
2777 | static bool | |
2778 | assign_parm_setup_block_p (struct assign_parm_data_one *data) | |
2779 | { | |
2780 | if (data->nominal_mode == BLKmode) | |
2781 | return true; | |
85776d60 DJ |
2782 | if (GET_MODE (data->entry_parm) == BLKmode) |
2783 | return true; | |
531547e9 | 2784 | |
6e985040 | 2785 | #ifdef BLOCK_REG_PADDING |
ae8c9754 RS |
2786 | /* Only assign_parm_setup_block knows how to deal with register arguments |
2787 | that are padded at the least significant end. */ | |
2788 | if (REG_P (data->entry_parm) | |
2789 | && GET_MODE_SIZE (data->promoted_mode) < UNITS_PER_WORD | |
2790 | && (BLOCK_REG_PADDING (data->passed_mode, data->passed_type, 1) | |
2791 | == (BYTES_BIG_ENDIAN ? upward : downward))) | |
6071dc7f | 2792 | return true; |
6e985040 | 2793 | #endif |
6071dc7f RH |
2794 | |
2795 | return false; | |
2796 | } | |
2797 | ||
b8698a0f | 2798 | /* A subroutine of assign_parms. Arrange for the parameter to be |
6071dc7f RH |
2799 | present and valid in DATA->STACK_RTL. */ |
2800 | ||
2801 | static void | |
27e29549 RH |
2802 | assign_parm_setup_block (struct assign_parm_data_all *all, |
2803 | tree parm, struct assign_parm_data_one *data) | |
6071dc7f RH |
2804 | { |
2805 | rtx entry_parm = data->entry_parm; | |
2806 | rtx stack_parm = data->stack_parm; | |
bfc45551 AM |
2807 | HOST_WIDE_INT size; |
2808 | HOST_WIDE_INT size_stored; | |
6071dc7f | 2809 | |
27e29549 RH |
2810 | if (GET_CODE (entry_parm) == PARALLEL) |
2811 | entry_parm = emit_group_move_into_temps (entry_parm); | |
2812 | ||
bfc45551 AM |
2813 | size = int_size_in_bytes (data->passed_type); |
2814 | size_stored = CEIL_ROUND (size, UNITS_PER_WORD); | |
2815 | if (stack_parm == 0) | |
2816 | { | |
a561d88b | 2817 | DECL_ALIGN (parm) = MAX (DECL_ALIGN (parm), BITS_PER_WORD); |
bfc45551 | 2818 | stack_parm = assign_stack_local (BLKmode, size_stored, |
a561d88b | 2819 | DECL_ALIGN (parm)); |
bfc45551 AM |
2820 | if (GET_MODE_SIZE (GET_MODE (entry_parm)) == size) |
2821 | PUT_MODE (stack_parm, GET_MODE (entry_parm)); | |
2822 | set_mem_attributes (stack_parm, parm, 1); | |
2823 | } | |
2824 | ||
6071dc7f RH |
2825 | /* If a BLKmode arrives in registers, copy it to a stack slot. Handle |
2826 | calls that pass values in multiple non-contiguous locations. */ | |
2827 | if (REG_P (entry_parm) || GET_CODE (entry_parm) == PARALLEL) | |
2828 | { | |
6071dc7f RH |
2829 | rtx mem; |
2830 | ||
2831 | /* Note that we will be storing an integral number of words. | |
2832 | So we have to be careful to ensure that we allocate an | |
bfc45551 | 2833 | integral number of words. We do this above when we call |
6071dc7f RH |
2834 | assign_stack_local if space was not allocated in the argument |
2835 | list. If it was, this will not work if PARM_BOUNDARY is not | |
2836 | a multiple of BITS_PER_WORD. It isn't clear how to fix this | |
2837 | if it becomes a problem. Exception is when BLKmode arrives | |
2838 | with arguments not conforming to word_mode. */ | |
2839 | ||
bfc45551 AM |
2840 | if (data->stack_parm == 0) |
2841 | ; | |
6071dc7f RH |
2842 | else if (GET_CODE (entry_parm) == PARALLEL) |
2843 | ; | |
0bccc606 NS |
2844 | else |
2845 | gcc_assert (!size || !(PARM_BOUNDARY % BITS_PER_WORD)); | |
6f086dfc | 2846 | |
1a8cb155 | 2847 | mem = validize_mem (copy_rtx (stack_parm)); |
c6b97fac | 2848 | |
6071dc7f RH |
2849 | /* Handle values in multiple non-contiguous locations. */ |
2850 | if (GET_CODE (entry_parm) == PARALLEL) | |
27e29549 | 2851 | { |
bb27eeda SE |
2852 | push_to_sequence2 (all->first_conversion_insn, |
2853 | all->last_conversion_insn); | |
27e29549 | 2854 | emit_group_store (mem, entry_parm, data->passed_type, size); |
bb27eeda SE |
2855 | all->first_conversion_insn = get_insns (); |
2856 | all->last_conversion_insn = get_last_insn (); | |
27e29549 RH |
2857 | end_sequence (); |
2858 | } | |
c6b97fac | 2859 | |
6071dc7f RH |
2860 | else if (size == 0) |
2861 | ; | |
5c07bd7a | 2862 | |
6071dc7f RH |
2863 | /* If SIZE is that of a mode no bigger than a word, just use |
2864 | that mode's store operation. */ | |
2865 | else if (size <= UNITS_PER_WORD) | |
2866 | { | |
ef4bddc2 | 2867 | machine_mode mode |
6071dc7f | 2868 | = mode_for_size (size * BITS_PER_UNIT, MODE_INT, 0); |
c6b97fac | 2869 | |
6071dc7f | 2870 | if (mode != BLKmode |
6e985040 | 2871 | #ifdef BLOCK_REG_PADDING |
6071dc7f RH |
2872 | && (size == UNITS_PER_WORD |
2873 | || (BLOCK_REG_PADDING (mode, data->passed_type, 1) | |
2874 | != (BYTES_BIG_ENDIAN ? upward : downward))) | |
6e985040 | 2875 | #endif |
6071dc7f RH |
2876 | ) |
2877 | { | |
208996c7 RS |
2878 | rtx reg; |
2879 | ||
2880 | /* We are really truncating a word_mode value containing | |
2881 | SIZE bytes into a value of mode MODE. If such an | |
2882 | operation requires no actual instructions, we can refer | |
2883 | to the value directly in mode MODE, otherwise we must | |
2884 | start with the register in word_mode and explicitly | |
2885 | convert it. */ | |
2886 | if (TRULY_NOOP_TRUNCATION (size * BITS_PER_UNIT, BITS_PER_WORD)) | |
2887 | reg = gen_rtx_REG (mode, REGNO (entry_parm)); | |
2888 | else | |
2889 | { | |
2890 | reg = gen_rtx_REG (word_mode, REGNO (entry_parm)); | |
2891 | reg = convert_to_mode (mode, copy_to_reg (reg), 1); | |
2892 | } | |
6071dc7f RH |
2893 | emit_move_insn (change_address (mem, mode, 0), reg); |
2894 | } | |
c6b97fac | 2895 | |
6071dc7f RH |
2896 | /* Blocks smaller than a word on a BYTES_BIG_ENDIAN |
2897 | machine must be aligned to the left before storing | |
2898 | to memory. Note that the previous test doesn't | |
2899 | handle all cases (e.g. SIZE == 3). */ | |
2900 | else if (size != UNITS_PER_WORD | |
6e985040 | 2901 | #ifdef BLOCK_REG_PADDING |
6071dc7f RH |
2902 | && (BLOCK_REG_PADDING (mode, data->passed_type, 1) |
2903 | == downward) | |
6e985040 | 2904 | #else |
6071dc7f | 2905 | && BYTES_BIG_ENDIAN |
6e985040 | 2906 | #endif |
6071dc7f RH |
2907 | ) |
2908 | { | |
2909 | rtx tem, x; | |
2910 | int by = (UNITS_PER_WORD - size) * BITS_PER_UNIT; | |
65c844e2 | 2911 | rtx reg = gen_rtx_REG (word_mode, REGNO (entry_parm)); |
6071dc7f | 2912 | |
eb6c3df1 | 2913 | x = expand_shift (LSHIFT_EXPR, word_mode, reg, by, NULL_RTX, 1); |
6071dc7f RH |
2914 | tem = change_address (mem, word_mode, 0); |
2915 | emit_move_insn (tem, x); | |
6f086dfc | 2916 | } |
6071dc7f | 2917 | else |
27e29549 | 2918 | move_block_from_reg (REGNO (entry_parm), mem, |
6071dc7f | 2919 | size_stored / UNITS_PER_WORD); |
6f086dfc | 2920 | } |
6071dc7f | 2921 | else |
27e29549 | 2922 | move_block_from_reg (REGNO (entry_parm), mem, |
6071dc7f RH |
2923 | size_stored / UNITS_PER_WORD); |
2924 | } | |
bfc45551 AM |
2925 | else if (data->stack_parm == 0) |
2926 | { | |
bb27eeda | 2927 | push_to_sequence2 (all->first_conversion_insn, all->last_conversion_insn); |
bfc45551 AM |
2928 | emit_block_move (stack_parm, data->entry_parm, GEN_INT (size), |
2929 | BLOCK_OP_NORMAL); | |
bb27eeda SE |
2930 | all->first_conversion_insn = get_insns (); |
2931 | all->last_conversion_insn = get_last_insn (); | |
bfc45551 AM |
2932 | end_sequence (); |
2933 | } | |
6071dc7f | 2934 | |
bfc45551 | 2935 | data->stack_parm = stack_parm; |
6071dc7f RH |
2936 | SET_DECL_RTL (parm, stack_parm); |
2937 | } | |
2938 | ||
2939 | /* A subroutine of assign_parms. Allocate a pseudo to hold the current | |
2940 | parameter. Get it there. Perform all ABI specified conversions. */ | |
2941 | ||
2942 | static void | |
2943 | assign_parm_setup_reg (struct assign_parm_data_all *all, tree parm, | |
2944 | struct assign_parm_data_one *data) | |
2945 | { | |
71008de4 BS |
2946 | rtx parmreg, validated_mem; |
2947 | rtx equiv_stack_parm; | |
ef4bddc2 | 2948 | machine_mode promoted_nominal_mode; |
6071dc7f RH |
2949 | int unsignedp = TYPE_UNSIGNED (TREE_TYPE (parm)); |
2950 | bool did_conversion = false; | |
71008de4 | 2951 | bool need_conversion, moved; |
6071dc7f RH |
2952 | |
2953 | /* Store the parm in a pseudoregister during the function, but we may | |
666e3ceb PB |
2954 | need to do it in a wider mode. Using 2 here makes the result |
2955 | consistent with promote_decl_mode and thus expand_expr_real_1. */ | |
6071dc7f | 2956 | promoted_nominal_mode |
cde0f3fd | 2957 | = promote_function_mode (data->nominal_type, data->nominal_mode, &unsignedp, |
666e3ceb | 2958 | TREE_TYPE (current_function_decl), 2); |
6071dc7f RH |
2959 | |
2960 | parmreg = gen_reg_rtx (promoted_nominal_mode); | |
2961 | ||
2962 | if (!DECL_ARTIFICIAL (parm)) | |
2963 | mark_user_reg (parmreg); | |
2964 | ||
2965 | /* If this was an item that we received a pointer to, | |
2966 | set DECL_RTL appropriately. */ | |
2967 | if (data->passed_pointer) | |
2968 | { | |
2969 | rtx x = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (data->passed_type)), parmreg); | |
2970 | set_mem_attributes (x, parm, 1); | |
2971 | SET_DECL_RTL (parm, x); | |
2972 | } | |
2973 | else | |
389fdba0 | 2974 | SET_DECL_RTL (parm, parmreg); |
6071dc7f | 2975 | |
4d2a9850 DJ |
2976 | assign_parm_remove_parallels (data); |
2977 | ||
666e3ceb PB |
2978 | /* Copy the value into the register, thus bridging between |
2979 | assign_parm_find_data_types and expand_expr_real_1. */ | |
6071dc7f | 2980 | |
71008de4 | 2981 | equiv_stack_parm = data->stack_parm; |
1a8cb155 | 2982 | validated_mem = validize_mem (copy_rtx (data->entry_parm)); |
71008de4 BS |
2983 | |
2984 | need_conversion = (data->nominal_mode != data->passed_mode | |
2985 | || promoted_nominal_mode != data->promoted_mode); | |
2986 | moved = false; | |
2987 | ||
dbb94435 BS |
2988 | if (need_conversion |
2989 | && GET_MODE_CLASS (data->nominal_mode) == MODE_INT | |
2990 | && data->nominal_mode == data->passed_mode | |
2991 | && data->nominal_mode == GET_MODE (data->entry_parm)) | |
71008de4 | 2992 | { |
6071dc7f RH |
2993 | /* ENTRY_PARM has been converted to PROMOTED_MODE, its |
2994 | mode, by the caller. We now have to convert it to | |
2995 | NOMINAL_MODE, if different. However, PARMREG may be in | |
2996 | a different mode than NOMINAL_MODE if it is being stored | |
2997 | promoted. | |
2998 | ||
2999 | If ENTRY_PARM is a hard register, it might be in a register | |
3000 | not valid for operating in its mode (e.g., an odd-numbered | |
3001 | register for a DFmode). In that case, moves are the only | |
3002 | thing valid, so we can't do a convert from there. This | |
3003 | occurs when the calling sequence allow such misaligned | |
3004 | usages. | |
3005 | ||
3006 | In addition, the conversion may involve a call, which could | |
3007 | clobber parameters which haven't been copied to pseudo | |
71008de4 BS |
3008 | registers yet. |
3009 | ||
3010 | First, we try to emit an insn which performs the necessary | |
3011 | conversion. We verify that this insn does not clobber any | |
3012 | hard registers. */ | |
3013 | ||
3014 | enum insn_code icode; | |
3015 | rtx op0, op1; | |
3016 | ||
3017 | icode = can_extend_p (promoted_nominal_mode, data->passed_mode, | |
3018 | unsignedp); | |
3019 | ||
3020 | op0 = parmreg; | |
3021 | op1 = validated_mem; | |
3022 | if (icode != CODE_FOR_nothing | |
2ef6ce06 RS |
3023 | && insn_operand_matches (icode, 0, op0) |
3024 | && insn_operand_matches (icode, 1, op1)) | |
71008de4 BS |
3025 | { |
3026 | enum rtx_code code = unsignedp ? ZERO_EXTEND : SIGN_EXTEND; | |
b32d5189 DM |
3027 | rtx_insn *insn, *insns; |
3028 | rtx t = op1; | |
71008de4 BS |
3029 | HARD_REG_SET hardregs; |
3030 | ||
3031 | start_sequence (); | |
f9fef349 JJ |
3032 | /* If op1 is a hard register that is likely spilled, first |
3033 | force it into a pseudo, otherwise combiner might extend | |
3034 | its lifetime too much. */ | |
3035 | if (GET_CODE (t) == SUBREG) | |
3036 | t = SUBREG_REG (t); | |
3037 | if (REG_P (t) | |
3038 | && HARD_REGISTER_P (t) | |
3039 | && ! TEST_HARD_REG_BIT (fixed_reg_set, REGNO (t)) | |
3040 | && targetm.class_likely_spilled_p (REGNO_REG_CLASS (REGNO (t)))) | |
3041 | { | |
3042 | t = gen_reg_rtx (GET_MODE (op1)); | |
3043 | emit_move_insn (t, op1); | |
3044 | } | |
3045 | else | |
3046 | t = op1; | |
a11899b2 DM |
3047 | rtx pat = gen_extend_insn (op0, t, promoted_nominal_mode, |
3048 | data->passed_mode, unsignedp); | |
3049 | emit_insn (pat); | |
71008de4 BS |
3050 | insns = get_insns (); |
3051 | ||
3052 | moved = true; | |
3053 | CLEAR_HARD_REG_SET (hardregs); | |
3054 | for (insn = insns; insn && moved; insn = NEXT_INSN (insn)) | |
3055 | { | |
3056 | if (INSN_P (insn)) | |
3057 | note_stores (PATTERN (insn), record_hard_reg_sets, | |
3058 | &hardregs); | |
3059 | if (!hard_reg_set_empty_p (hardregs)) | |
3060 | moved = false; | |
3061 | } | |
3062 | ||
3063 | end_sequence (); | |
3064 | ||
3065 | if (moved) | |
3066 | { | |
3067 | emit_insn (insns); | |
dbb94435 BS |
3068 | if (equiv_stack_parm != NULL_RTX) |
3069 | equiv_stack_parm = gen_rtx_fmt_e (code, GET_MODE (parmreg), | |
3070 | equiv_stack_parm); | |
71008de4 BS |
3071 | } |
3072 | } | |
3073 | } | |
3074 | ||
3075 | if (moved) | |
3076 | /* Nothing to do. */ | |
3077 | ; | |
3078 | else if (need_conversion) | |
3079 | { | |
3080 | /* We did not have an insn to convert directly, or the sequence | |
3081 | generated appeared unsafe. We must first copy the parm to a | |
3082 | pseudo reg, and save the conversion until after all | |
6071dc7f RH |
3083 | parameters have been moved. */ |
3084 | ||
71008de4 | 3085 | int save_tree_used; |
6071dc7f RH |
3086 | rtx tempreg = gen_reg_rtx (GET_MODE (data->entry_parm)); |
3087 | ||
71008de4 | 3088 | emit_move_insn (tempreg, validated_mem); |
6071dc7f | 3089 | |
bb27eeda | 3090 | push_to_sequence2 (all->first_conversion_insn, all->last_conversion_insn); |
6071dc7f RH |
3091 | tempreg = convert_to_mode (data->nominal_mode, tempreg, unsignedp); |
3092 | ||
3093 | if (GET_CODE (tempreg) == SUBREG | |
3094 | && GET_MODE (tempreg) == data->nominal_mode | |
3095 | && REG_P (SUBREG_REG (tempreg)) | |
3096 | && data->nominal_mode == data->passed_mode | |
3097 | && GET_MODE (SUBREG_REG (tempreg)) == GET_MODE (data->entry_parm) | |
3098 | && GET_MODE_SIZE (GET_MODE (tempreg)) | |
3099 | < GET_MODE_SIZE (GET_MODE (data->entry_parm))) | |
6f086dfc | 3100 | { |
6071dc7f RH |
3101 | /* The argument is already sign/zero extended, so note it |
3102 | into the subreg. */ | |
3103 | SUBREG_PROMOTED_VAR_P (tempreg) = 1; | |
362d42dc | 3104 | SUBREG_PROMOTED_SET (tempreg, unsignedp); |
6071dc7f | 3105 | } |
00d8a4c1 | 3106 | |
6071dc7f RH |
3107 | /* TREE_USED gets set erroneously during expand_assignment. */ |
3108 | save_tree_used = TREE_USED (parm); | |
79f5e442 | 3109 | expand_assignment (parm, make_tree (data->nominal_type, tempreg), false); |
6071dc7f | 3110 | TREE_USED (parm) = save_tree_used; |
bb27eeda SE |
3111 | all->first_conversion_insn = get_insns (); |
3112 | all->last_conversion_insn = get_last_insn (); | |
6071dc7f | 3113 | end_sequence (); |
00d8a4c1 | 3114 | |
6071dc7f RH |
3115 | did_conversion = true; |
3116 | } | |
3117 | else | |
71008de4 | 3118 | emit_move_insn (parmreg, validated_mem); |
6071dc7f RH |
3119 | |
3120 | /* If we were passed a pointer but the actual value can safely live | |
f7e088e7 EB |
3121 | in a register, retrieve it and use it directly. */ |
3122 | if (data->passed_pointer && TYPE_MODE (TREE_TYPE (parm)) != BLKmode) | |
6071dc7f RH |
3123 | { |
3124 | /* We can't use nominal_mode, because it will have been set to | |
3125 | Pmode above. We must use the actual mode of the parm. */ | |
f7e088e7 EB |
3126 | if (use_register_for_decl (parm)) |
3127 | { | |
3128 | parmreg = gen_reg_rtx (TYPE_MODE (TREE_TYPE (parm))); | |
3129 | mark_user_reg (parmreg); | |
3130 | } | |
3131 | else | |
3132 | { | |
3133 | int align = STACK_SLOT_ALIGNMENT (TREE_TYPE (parm), | |
3134 | TYPE_MODE (TREE_TYPE (parm)), | |
3135 | TYPE_ALIGN (TREE_TYPE (parm))); | |
3136 | parmreg | |
3137 | = assign_stack_local (TYPE_MODE (TREE_TYPE (parm)), | |
3138 | GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (parm))), | |
3139 | align); | |
3140 | set_mem_attributes (parmreg, parm, 1); | |
3141 | } | |
cd5b3469 | 3142 | |
6071dc7f RH |
3143 | if (GET_MODE (parmreg) != GET_MODE (DECL_RTL (parm))) |
3144 | { | |
3145 | rtx tempreg = gen_reg_rtx (GET_MODE (DECL_RTL (parm))); | |
3146 | int unsigned_p = TYPE_UNSIGNED (TREE_TYPE (parm)); | |
3147 | ||
bb27eeda SE |
3148 | push_to_sequence2 (all->first_conversion_insn, |
3149 | all->last_conversion_insn); | |
6071dc7f RH |
3150 | emit_move_insn (tempreg, DECL_RTL (parm)); |
3151 | tempreg = convert_to_mode (GET_MODE (parmreg), tempreg, unsigned_p); | |
3152 | emit_move_insn (parmreg, tempreg); | |
bb27eeda SE |
3153 | all->first_conversion_insn = get_insns (); |
3154 | all->last_conversion_insn = get_last_insn (); | |
6071dc7f | 3155 | end_sequence (); |
6f086dfc | 3156 | |
6071dc7f RH |
3157 | did_conversion = true; |
3158 | } | |
3159 | else | |
3160 | emit_move_insn (parmreg, DECL_RTL (parm)); | |
6f086dfc | 3161 | |
6071dc7f | 3162 | SET_DECL_RTL (parm, parmreg); |
797a6ac1 | 3163 | |
6071dc7f RH |
3164 | /* STACK_PARM is the pointer, not the parm, and PARMREG is |
3165 | now the parm. */ | |
3166 | data->stack_parm = NULL; | |
3167 | } | |
ddef6bc7 | 3168 | |
6071dc7f RH |
3169 | /* Mark the register as eliminable if we did no conversion and it was |
3170 | copied from memory at a fixed offset, and the arg pointer was not | |
3171 | copied to a pseudo-reg. If the arg pointer is a pseudo reg or the | |
3172 | offset formed an invalid address, such memory-equivalences as we | |
3173 | make here would screw up life analysis for it. */ | |
3174 | if (data->nominal_mode == data->passed_mode | |
3175 | && !did_conversion | |
3176 | && data->stack_parm != 0 | |
3177 | && MEM_P (data->stack_parm) | |
3178 | && data->locate.offset.var == 0 | |
3179 | && reg_mentioned_p (virtual_incoming_args_rtx, | |
3180 | XEXP (data->stack_parm, 0))) | |
3181 | { | |
691fe203 DM |
3182 | rtx_insn *linsn = get_last_insn (); |
3183 | rtx_insn *sinsn; | |
3184 | rtx set; | |
a03caf76 | 3185 | |
6071dc7f RH |
3186 | /* Mark complex types separately. */ |
3187 | if (GET_CODE (parmreg) == CONCAT) | |
3188 | { | |
ef4bddc2 | 3189 | machine_mode submode |
6071dc7f | 3190 | = GET_MODE_INNER (GET_MODE (parmreg)); |
1466e387 RH |
3191 | int regnor = REGNO (XEXP (parmreg, 0)); |
3192 | int regnoi = REGNO (XEXP (parmreg, 1)); | |
3193 | rtx stackr = adjust_address_nv (data->stack_parm, submode, 0); | |
3194 | rtx stacki = adjust_address_nv (data->stack_parm, submode, | |
3195 | GET_MODE_SIZE (submode)); | |
6071dc7f RH |
3196 | |
3197 | /* Scan backwards for the set of the real and | |
3198 | imaginary parts. */ | |
3199 | for (sinsn = linsn; sinsn != 0; | |
3200 | sinsn = prev_nonnote_insn (sinsn)) | |
3201 | { | |
3202 | set = single_set (sinsn); | |
3203 | if (set == 0) | |
3204 | continue; | |
3205 | ||
3206 | if (SET_DEST (set) == regno_reg_rtx [regnoi]) | |
a31830a7 | 3207 | set_unique_reg_note (sinsn, REG_EQUIV, stacki); |
6071dc7f | 3208 | else if (SET_DEST (set) == regno_reg_rtx [regnor]) |
a31830a7 | 3209 | set_unique_reg_note (sinsn, REG_EQUIV, stackr); |
a03caf76 | 3210 | } |
6071dc7f | 3211 | } |
7543f918 JR |
3212 | else |
3213 | set_dst_reg_note (linsn, REG_EQUIV, equiv_stack_parm, parmreg); | |
6071dc7f RH |
3214 | } |
3215 | ||
3216 | /* For pointer data type, suggest pointer register. */ | |
3217 | if (POINTER_TYPE_P (TREE_TYPE (parm))) | |
3218 | mark_reg_pointer (parmreg, | |
3219 | TYPE_ALIGN (TREE_TYPE (TREE_TYPE (parm)))); | |
3220 | } | |
3221 | ||
3222 | /* A subroutine of assign_parms. Allocate stack space to hold the current | |
3223 | parameter. Get it there. Perform all ABI specified conversions. */ | |
3224 | ||
3225 | static void | |
3226 | assign_parm_setup_stack (struct assign_parm_data_all *all, tree parm, | |
3227 | struct assign_parm_data_one *data) | |
3228 | { | |
3229 | /* Value must be stored in the stack slot STACK_PARM during function | |
3230 | execution. */ | |
bfc45551 | 3231 | bool to_conversion = false; |
6071dc7f | 3232 | |
4d2a9850 DJ |
3233 | assign_parm_remove_parallels (data); |
3234 | ||
6071dc7f RH |
3235 | if (data->promoted_mode != data->nominal_mode) |
3236 | { | |
3237 | /* Conversion is required. */ | |
3238 | rtx tempreg = gen_reg_rtx (GET_MODE (data->entry_parm)); | |
6f086dfc | 3239 | |
1a8cb155 | 3240 | emit_move_insn (tempreg, validize_mem (copy_rtx (data->entry_parm))); |
6071dc7f | 3241 | |
bb27eeda | 3242 | push_to_sequence2 (all->first_conversion_insn, all->last_conversion_insn); |
bfc45551 AM |
3243 | to_conversion = true; |
3244 | ||
6071dc7f RH |
3245 | data->entry_parm = convert_to_mode (data->nominal_mode, tempreg, |
3246 | TYPE_UNSIGNED (TREE_TYPE (parm))); | |
3247 | ||
3248 | if (data->stack_parm) | |
dd67163f JJ |
3249 | { |
3250 | int offset = subreg_lowpart_offset (data->nominal_mode, | |
3251 | GET_MODE (data->stack_parm)); | |
3252 | /* ??? This may need a big-endian conversion on sparc64. */ | |
3253 | data->stack_parm | |
3254 | = adjust_address (data->stack_parm, data->nominal_mode, 0); | |
527210c4 | 3255 | if (offset && MEM_OFFSET_KNOWN_P (data->stack_parm)) |
dd67163f | 3256 | set_mem_offset (data->stack_parm, |
527210c4 | 3257 | MEM_OFFSET (data->stack_parm) + offset); |
dd67163f | 3258 | } |
6071dc7f RH |
3259 | } |
3260 | ||
3261 | if (data->entry_parm != data->stack_parm) | |
3262 | { | |
bfc45551 AM |
3263 | rtx src, dest; |
3264 | ||
6071dc7f RH |
3265 | if (data->stack_parm == 0) |
3266 | { | |
3a695389 UW |
3267 | int align = STACK_SLOT_ALIGNMENT (data->passed_type, |
3268 | GET_MODE (data->entry_parm), | |
3269 | TYPE_ALIGN (data->passed_type)); | |
6071dc7f RH |
3270 | data->stack_parm |
3271 | = assign_stack_local (GET_MODE (data->entry_parm), | |
3272 | GET_MODE_SIZE (GET_MODE (data->entry_parm)), | |
3a695389 | 3273 | align); |
6071dc7f | 3274 | set_mem_attributes (data->stack_parm, parm, 1); |
6f086dfc | 3275 | } |
6071dc7f | 3276 | |
1a8cb155 RS |
3277 | dest = validize_mem (copy_rtx (data->stack_parm)); |
3278 | src = validize_mem (copy_rtx (data->entry_parm)); | |
bfc45551 AM |
3279 | |
3280 | if (MEM_P (src)) | |
6f086dfc | 3281 | { |
bfc45551 AM |
3282 | /* Use a block move to handle potentially misaligned entry_parm. */ |
3283 | if (!to_conversion) | |
bb27eeda SE |
3284 | push_to_sequence2 (all->first_conversion_insn, |
3285 | all->last_conversion_insn); | |
bfc45551 AM |
3286 | to_conversion = true; |
3287 | ||
3288 | emit_block_move (dest, src, | |
3289 | GEN_INT (int_size_in_bytes (data->passed_type)), | |
3290 | BLOCK_OP_NORMAL); | |
6071dc7f RH |
3291 | } |
3292 | else | |
bfc45551 AM |
3293 | emit_move_insn (dest, src); |
3294 | } | |
3295 | ||
3296 | if (to_conversion) | |
3297 | { | |
bb27eeda SE |
3298 | all->first_conversion_insn = get_insns (); |
3299 | all->last_conversion_insn = get_last_insn (); | |
bfc45551 | 3300 | end_sequence (); |
6071dc7f | 3301 | } |
6f086dfc | 3302 | |
6071dc7f RH |
3303 | SET_DECL_RTL (parm, data->stack_parm); |
3304 | } | |
3412b298 | 3305 | |
6071dc7f RH |
3306 | /* A subroutine of assign_parms. If the ABI splits complex arguments, then |
3307 | undo the frobbing that we did in assign_parms_augmented_arg_list. */ | |
86f8eff3 | 3308 | |
6071dc7f | 3309 | static void |
3b3f318a | 3310 | assign_parms_unsplit_complex (struct assign_parm_data_all *all, |
9771b263 | 3311 | vec<tree> fnargs) |
6071dc7f RH |
3312 | { |
3313 | tree parm; | |
6ccd356e | 3314 | tree orig_fnargs = all->orig_fnargs; |
3b3f318a | 3315 | unsigned i = 0; |
f4ef873c | 3316 | |
3b3f318a | 3317 | for (parm = orig_fnargs; parm; parm = TREE_CHAIN (parm), ++i) |
6071dc7f RH |
3318 | { |
3319 | if (TREE_CODE (TREE_TYPE (parm)) == COMPLEX_TYPE | |
3320 | && targetm.calls.split_complex_arg (TREE_TYPE (parm))) | |
3321 | { | |
3322 | rtx tmp, real, imag; | |
ef4bddc2 | 3323 | machine_mode inner = GET_MODE_INNER (DECL_MODE (parm)); |
6f086dfc | 3324 | |
9771b263 DN |
3325 | real = DECL_RTL (fnargs[i]); |
3326 | imag = DECL_RTL (fnargs[i + 1]); | |
6071dc7f | 3327 | if (inner != GET_MODE (real)) |
6f086dfc | 3328 | { |
6071dc7f RH |
3329 | real = gen_lowpart_SUBREG (inner, real); |
3330 | imag = gen_lowpart_SUBREG (inner, imag); | |
3331 | } | |
6ccd356e AM |
3332 | |
3333 | if (TREE_ADDRESSABLE (parm)) | |
3334 | { | |
3335 | rtx rmem, imem; | |
3336 | HOST_WIDE_INT size = int_size_in_bytes (TREE_TYPE (parm)); | |
3a695389 UW |
3337 | int align = STACK_SLOT_ALIGNMENT (TREE_TYPE (parm), |
3338 | DECL_MODE (parm), | |
3339 | TYPE_ALIGN (TREE_TYPE (parm))); | |
6ccd356e AM |
3340 | |
3341 | /* split_complex_arg put the real and imag parts in | |
3342 | pseudos. Move them to memory. */ | |
3a695389 | 3343 | tmp = assign_stack_local (DECL_MODE (parm), size, align); |
6ccd356e AM |
3344 | set_mem_attributes (tmp, parm, 1); |
3345 | rmem = adjust_address_nv (tmp, inner, 0); | |
3346 | imem = adjust_address_nv (tmp, inner, GET_MODE_SIZE (inner)); | |
bb27eeda SE |
3347 | push_to_sequence2 (all->first_conversion_insn, |
3348 | all->last_conversion_insn); | |
6ccd356e AM |
3349 | emit_move_insn (rmem, real); |
3350 | emit_move_insn (imem, imag); | |
bb27eeda SE |
3351 | all->first_conversion_insn = get_insns (); |
3352 | all->last_conversion_insn = get_last_insn (); | |
6ccd356e AM |
3353 | end_sequence (); |
3354 | } | |
3355 | else | |
3356 | tmp = gen_rtx_CONCAT (DECL_MODE (parm), real, imag); | |
6071dc7f | 3357 | SET_DECL_RTL (parm, tmp); |
7e41ffa2 | 3358 | |
9771b263 DN |
3359 | real = DECL_INCOMING_RTL (fnargs[i]); |
3360 | imag = DECL_INCOMING_RTL (fnargs[i + 1]); | |
6071dc7f RH |
3361 | if (inner != GET_MODE (real)) |
3362 | { | |
3363 | real = gen_lowpart_SUBREG (inner, real); | |
3364 | imag = gen_lowpart_SUBREG (inner, imag); | |
6f086dfc | 3365 | } |
6071dc7f | 3366 | tmp = gen_rtx_CONCAT (DECL_MODE (parm), real, imag); |
5141868d | 3367 | set_decl_incoming_rtl (parm, tmp, false); |
3b3f318a | 3368 | i++; |
6f086dfc | 3369 | } |
6f086dfc | 3370 | } |
6071dc7f RH |
3371 | } |
3372 | ||
3373 | /* Assign RTL expressions to the function's parameters. This may involve | |
3374 | copying them into registers and using those registers as the DECL_RTL. */ | |
3375 | ||
6fe79279 | 3376 | static void |
6071dc7f RH |
3377 | assign_parms (tree fndecl) |
3378 | { | |
3379 | struct assign_parm_data_all all; | |
3b3f318a | 3380 | tree parm; |
9771b263 | 3381 | vec<tree> fnargs; |
3b3f318a | 3382 | unsigned i; |
6f086dfc | 3383 | |
38173d38 | 3384 | crtl->args.internal_arg_pointer |
150cdc9e | 3385 | = targetm.calls.internal_arg_pointer (); |
6071dc7f RH |
3386 | |
3387 | assign_parms_initialize_all (&all); | |
3388 | fnargs = assign_parms_augmented_arg_list (&all); | |
3389 | ||
9771b263 | 3390 | FOR_EACH_VEC_ELT (fnargs, i, parm) |
ded9bf77 | 3391 | { |
6071dc7f RH |
3392 | struct assign_parm_data_one data; |
3393 | ||
3394 | /* Extract the type of PARM; adjust it according to ABI. */ | |
3395 | assign_parm_find_data_types (&all, parm, &data); | |
3396 | ||
3397 | /* Early out for errors and void parameters. */ | |
3398 | if (data.passed_mode == VOIDmode) | |
ded9bf77 | 3399 | { |
6071dc7f RH |
3400 | SET_DECL_RTL (parm, const0_rtx); |
3401 | DECL_INCOMING_RTL (parm) = DECL_RTL (parm); | |
3402 | continue; | |
3403 | } | |
196c42cd | 3404 | |
2e3f842f L |
3405 | /* Estimate stack alignment from parameter alignment. */ |
3406 | if (SUPPORTS_STACK_ALIGNMENT) | |
3407 | { | |
c2ed6cf8 NF |
3408 | unsigned int align |
3409 | = targetm.calls.function_arg_boundary (data.promoted_mode, | |
3410 | data.passed_type); | |
ae58e548 JJ |
3411 | align = MINIMUM_ALIGNMENT (data.passed_type, data.promoted_mode, |
3412 | align); | |
2e3f842f | 3413 | if (TYPE_ALIGN (data.nominal_type) > align) |
ae58e548 JJ |
3414 | align = MINIMUM_ALIGNMENT (data.nominal_type, |
3415 | TYPE_MODE (data.nominal_type), | |
3416 | TYPE_ALIGN (data.nominal_type)); | |
2e3f842f L |
3417 | if (crtl->stack_alignment_estimated < align) |
3418 | { | |
3419 | gcc_assert (!crtl->stack_realign_processed); | |
3420 | crtl->stack_alignment_estimated = align; | |
3421 | } | |
3422 | } | |
b8698a0f | 3423 | |
910ad8de | 3424 | if (cfun->stdarg && !DECL_CHAIN (parm)) |
8117c488 | 3425 | assign_parms_setup_varargs (&all, &data, false); |
196c42cd | 3426 | |
6071dc7f RH |
3427 | /* Find out where the parameter arrives in this function. */ |
3428 | assign_parm_find_entry_rtl (&all, &data); | |
3429 | ||
3430 | /* Find out where stack space for this parameter might be. */ | |
3431 | if (assign_parm_is_stack_parm (&all, &data)) | |
3432 | { | |
3433 | assign_parm_find_stack_rtl (parm, &data); | |
3434 | assign_parm_adjust_entry_rtl (&data); | |
ded9bf77 | 3435 | } |
6071dc7f RH |
3436 | |
3437 | /* Record permanently how this parm was passed. */ | |
a82ff31f JJ |
3438 | if (data.passed_pointer) |
3439 | { | |
3440 | rtx incoming_rtl | |
3441 | = gen_rtx_MEM (TYPE_MODE (TREE_TYPE (data.passed_type)), | |
3442 | data.entry_parm); | |
3443 | set_decl_incoming_rtl (parm, incoming_rtl, true); | |
3444 | } | |
3445 | else | |
3446 | set_decl_incoming_rtl (parm, data.entry_parm, false); | |
6071dc7f RH |
3447 | |
3448 | /* Update info on where next arg arrives in registers. */ | |
d5cc9181 | 3449 | targetm.calls.function_arg_advance (all.args_so_far, data.promoted_mode, |
3c07301f | 3450 | data.passed_type, data.named_arg); |
6071dc7f RH |
3451 | |
3452 | assign_parm_adjust_stack_rtl (&data); | |
3453 | ||
3454 | if (assign_parm_setup_block_p (&data)) | |
27e29549 | 3455 | assign_parm_setup_block (&all, parm, &data); |
6071dc7f RH |
3456 | else if (data.passed_pointer || use_register_for_decl (parm)) |
3457 | assign_parm_setup_reg (&all, parm, &data); | |
3458 | else | |
3459 | assign_parm_setup_stack (&all, parm, &data); | |
ded9bf77 AH |
3460 | } |
3461 | ||
3b3f318a | 3462 | if (targetm.calls.split_complex_arg) |
6ccd356e | 3463 | assign_parms_unsplit_complex (&all, fnargs); |
6071dc7f | 3464 | |
9771b263 | 3465 | fnargs.release (); |
3b3f318a | 3466 | |
bcb21886 KY |
3467 | /* Initialize pic_offset_table_rtx with a pseudo register |
3468 | if required. */ | |
3469 | if (targetm.use_pseudo_pic_reg ()) | |
3470 | pic_offset_table_rtx = gen_reg_rtx (Pmode); | |
3471 | ||
3412b298 JW |
3472 | /* Output all parameter conversion instructions (possibly including calls) |
3473 | now that all parameters have been copied out of hard registers. */ | |
bb27eeda | 3474 | emit_insn (all.first_conversion_insn); |
3412b298 | 3475 | |
2e3f842f L |
3476 | /* Estimate reload stack alignment from scalar return mode. */ |
3477 | if (SUPPORTS_STACK_ALIGNMENT) | |
3478 | { | |
3479 | if (DECL_RESULT (fndecl)) | |
3480 | { | |
3481 | tree type = TREE_TYPE (DECL_RESULT (fndecl)); | |
ef4bddc2 | 3482 | machine_mode mode = TYPE_MODE (type); |
2e3f842f L |
3483 | |
3484 | if (mode != BLKmode | |
3485 | && mode != VOIDmode | |
3486 | && !AGGREGATE_TYPE_P (type)) | |
3487 | { | |
3488 | unsigned int align = GET_MODE_ALIGNMENT (mode); | |
3489 | if (crtl->stack_alignment_estimated < align) | |
3490 | { | |
3491 | gcc_assert (!crtl->stack_realign_processed); | |
3492 | crtl->stack_alignment_estimated = align; | |
3493 | } | |
3494 | } | |
b8698a0f | 3495 | } |
2e3f842f L |
3496 | } |
3497 | ||
b36a8cc2 OH |
3498 | /* If we are receiving a struct value address as the first argument, set up |
3499 | the RTL for the function result. As this might require code to convert | |
3500 | the transmitted address to Pmode, we do this here to ensure that possible | |
3501 | preliminary conversions of the address have been emitted already. */ | |
6071dc7f | 3502 | if (all.function_result_decl) |
b36a8cc2 | 3503 | { |
6071dc7f RH |
3504 | tree result = DECL_RESULT (current_function_decl); |
3505 | rtx addr = DECL_RTL (all.function_result_decl); | |
b36a8cc2 | 3506 | rtx x; |
fa8db1f7 | 3507 | |
cc77ae10 | 3508 | if (DECL_BY_REFERENCE (result)) |
8dcfef8f AO |
3509 | { |
3510 | SET_DECL_VALUE_EXPR (result, all.function_result_decl); | |
3511 | x = addr; | |
3512 | } | |
cc77ae10 JM |
3513 | else |
3514 | { | |
8dcfef8f AO |
3515 | SET_DECL_VALUE_EXPR (result, |
3516 | build1 (INDIRECT_REF, TREE_TYPE (result), | |
3517 | all.function_result_decl)); | |
cc77ae10 JM |
3518 | addr = convert_memory_address (Pmode, addr); |
3519 | x = gen_rtx_MEM (DECL_MODE (result), addr); | |
3520 | set_mem_attributes (x, result, 1); | |
3521 | } | |
8dcfef8f AO |
3522 | |
3523 | DECL_HAS_VALUE_EXPR_P (result) = 1; | |
3524 | ||
b36a8cc2 OH |
3525 | SET_DECL_RTL (result, x); |
3526 | } | |
3527 | ||
53c428d0 | 3528 | /* We have aligned all the args, so add space for the pretend args. */ |
38173d38 | 3529 | crtl->args.pretend_args_size = all.pretend_args_size; |
6071dc7f | 3530 | all.stack_args_size.constant += all.extra_pretend_bytes; |
38173d38 | 3531 | crtl->args.size = all.stack_args_size.constant; |
6f086dfc RS |
3532 | |
3533 | /* Adjust function incoming argument size for alignment and | |
3534 | minimum length. */ | |
3535 | ||
2e4ceca5 | 3536 | crtl->args.size = MAX (crtl->args.size, all.reg_parm_stack_space); |
38173d38 | 3537 | crtl->args.size = CEIL_ROUND (crtl->args.size, |
53366450 | 3538 | PARM_BOUNDARY / BITS_PER_UNIT); |
4433e339 | 3539 | |
6f086dfc | 3540 | #ifdef ARGS_GROW_DOWNWARD |
38173d38 | 3541 | crtl->args.arg_offset_rtx |
477eff96 | 3542 | = (all.stack_args_size.var == 0 ? GEN_INT (-all.stack_args_size.constant) |
6071dc7f RH |
3543 | : expand_expr (size_diffop (all.stack_args_size.var, |
3544 | size_int (-all.stack_args_size.constant)), | |
bbbbb16a | 3545 | NULL_RTX, VOIDmode, EXPAND_NORMAL)); |
6f086dfc | 3546 | #else |
38173d38 | 3547 | crtl->args.arg_offset_rtx = ARGS_SIZE_RTX (all.stack_args_size); |
6f086dfc RS |
3548 | #endif |
3549 | ||
3550 | /* See how many bytes, if any, of its args a function should try to pop | |
3551 | on return. */ | |
3552 | ||
079e7538 NF |
3553 | crtl->args.pops_args = targetm.calls.return_pops_args (fndecl, |
3554 | TREE_TYPE (fndecl), | |
3555 | crtl->args.size); | |
6f086dfc | 3556 | |
3b69d50e RK |
3557 | /* For stdarg.h function, save info about |
3558 | regs and stack space used by the named args. */ | |
6f086dfc | 3559 | |
d5cc9181 | 3560 | crtl->args.info = all.args_so_far_v; |
6f086dfc RS |
3561 | |
3562 | /* Set the rtx used for the function return value. Put this in its | |
3563 | own variable so any optimizers that need this information don't have | |
3564 | to include tree.h. Do this here so it gets done when an inlined | |
3565 | function gets output. */ | |
3566 | ||
38173d38 | 3567 | crtl->return_rtx |
19e7881c MM |
3568 | = (DECL_RTL_SET_P (DECL_RESULT (fndecl)) |
3569 | ? DECL_RTL (DECL_RESULT (fndecl)) : NULL_RTX); | |
ce5e43d0 JJ |
3570 | |
3571 | /* If scalar return value was computed in a pseudo-reg, or was a named | |
3572 | return value that got dumped to the stack, copy that to the hard | |
3573 | return register. */ | |
3574 | if (DECL_RTL_SET_P (DECL_RESULT (fndecl))) | |
3575 | { | |
3576 | tree decl_result = DECL_RESULT (fndecl); | |
3577 | rtx decl_rtl = DECL_RTL (decl_result); | |
3578 | ||
3579 | if (REG_P (decl_rtl) | |
3580 | ? REGNO (decl_rtl) >= FIRST_PSEUDO_REGISTER | |
3581 | : DECL_REGISTER (decl_result)) | |
3582 | { | |
3583 | rtx real_decl_rtl; | |
3584 | ||
1d636cc6 RG |
3585 | real_decl_rtl = targetm.calls.function_value (TREE_TYPE (decl_result), |
3586 | fndecl, true); | |
ce5e43d0 | 3587 | REG_FUNCTION_VALUE_P (real_decl_rtl) = 1; |
38173d38 | 3588 | /* The delay slot scheduler assumes that crtl->return_rtx |
ce5e43d0 JJ |
3589 | holds the hard register containing the return value, not a |
3590 | temporary pseudo. */ | |
38173d38 | 3591 | crtl->return_rtx = real_decl_rtl; |
ce5e43d0 JJ |
3592 | } |
3593 | } | |
6f086dfc | 3594 | } |
4744afba RH |
3595 | |
3596 | /* A subroutine of gimplify_parameters, invoked via walk_tree. | |
3597 | For all seen types, gimplify their sizes. */ | |
3598 | ||
3599 | static tree | |
3600 | gimplify_parm_type (tree *tp, int *walk_subtrees, void *data) | |
3601 | { | |
3602 | tree t = *tp; | |
3603 | ||
3604 | *walk_subtrees = 0; | |
3605 | if (TYPE_P (t)) | |
3606 | { | |
3607 | if (POINTER_TYPE_P (t)) | |
3608 | *walk_subtrees = 1; | |
ad50bc8d RH |
3609 | else if (TYPE_SIZE (t) && !TREE_CONSTANT (TYPE_SIZE (t)) |
3610 | && !TYPE_SIZES_GIMPLIFIED (t)) | |
4744afba | 3611 | { |
726a989a | 3612 | gimplify_type_sizes (t, (gimple_seq *) data); |
4744afba RH |
3613 | *walk_subtrees = 1; |
3614 | } | |
3615 | } | |
3616 | ||
3617 | return NULL; | |
3618 | } | |
3619 | ||
3620 | /* Gimplify the parameter list for current_function_decl. This involves | |
3621 | evaluating SAVE_EXPRs of variable sized parameters and generating code | |
726a989a RB |
3622 | to implement callee-copies reference parameters. Returns a sequence of |
3623 | statements to add to the beginning of the function. */ | |
4744afba | 3624 | |
726a989a | 3625 | gimple_seq |
4744afba RH |
3626 | gimplify_parameters (void) |
3627 | { | |
3628 | struct assign_parm_data_all all; | |
3b3f318a | 3629 | tree parm; |
726a989a | 3630 | gimple_seq stmts = NULL; |
9771b263 | 3631 | vec<tree> fnargs; |
3b3f318a | 3632 | unsigned i; |
4744afba RH |
3633 | |
3634 | assign_parms_initialize_all (&all); | |
3635 | fnargs = assign_parms_augmented_arg_list (&all); | |
3636 | ||
9771b263 | 3637 | FOR_EACH_VEC_ELT (fnargs, i, parm) |
4744afba RH |
3638 | { |
3639 | struct assign_parm_data_one data; | |
3640 | ||
3641 | /* Extract the type of PARM; adjust it according to ABI. */ | |
3642 | assign_parm_find_data_types (&all, parm, &data); | |
3643 | ||
3644 | /* Early out for errors and void parameters. */ | |
3645 | if (data.passed_mode == VOIDmode || DECL_SIZE (parm) == NULL) | |
3646 | continue; | |
3647 | ||
3648 | /* Update info on where next arg arrives in registers. */ | |
d5cc9181 | 3649 | targetm.calls.function_arg_advance (all.args_so_far, data.promoted_mode, |
3c07301f | 3650 | data.passed_type, data.named_arg); |
4744afba RH |
3651 | |
3652 | /* ??? Once upon a time variable_size stuffed parameter list | |
3653 | SAVE_EXPRs (amongst others) onto a pending sizes list. This | |
3654 | turned out to be less than manageable in the gimple world. | |
3655 | Now we have to hunt them down ourselves. */ | |
3656 | walk_tree_without_duplicates (&data.passed_type, | |
3657 | gimplify_parm_type, &stmts); | |
3658 | ||
b38f3813 | 3659 | if (TREE_CODE (DECL_SIZE_UNIT (parm)) != INTEGER_CST) |
4744afba RH |
3660 | { |
3661 | gimplify_one_sizepos (&DECL_SIZE (parm), &stmts); | |
3662 | gimplify_one_sizepos (&DECL_SIZE_UNIT (parm), &stmts); | |
3663 | } | |
3664 | ||
3665 | if (data.passed_pointer) | |
3666 | { | |
3667 | tree type = TREE_TYPE (data.passed_type); | |
d5cc9181 | 3668 | if (reference_callee_copied (&all.args_so_far_v, TYPE_MODE (type), |
4744afba RH |
3669 | type, data.named_arg)) |
3670 | { | |
3671 | tree local, t; | |
3672 | ||
b38f3813 | 3673 | /* For constant-sized objects, this is trivial; for |
4744afba | 3674 | variable-sized objects, we have to play games. */ |
b38f3813 EB |
3675 | if (TREE_CODE (DECL_SIZE_UNIT (parm)) == INTEGER_CST |
3676 | && !(flag_stack_check == GENERIC_STACK_CHECK | |
3677 | && compare_tree_int (DECL_SIZE_UNIT (parm), | |
3678 | STACK_CHECK_MAX_VAR_SIZE) > 0)) | |
4744afba | 3679 | { |
5dac1dae | 3680 | local = create_tmp_var (type, get_name (parm)); |
4744afba | 3681 | DECL_IGNORED_P (local) = 0; |
04487a2f JJ |
3682 | /* If PARM was addressable, move that flag over |
3683 | to the local copy, as its address will be taken, | |
37609bf0 RG |
3684 | not the PARMs. Keep the parms address taken |
3685 | as we'll query that flag during gimplification. */ | |
04487a2f | 3686 | if (TREE_ADDRESSABLE (parm)) |
37609bf0 | 3687 | TREE_ADDRESSABLE (local) = 1; |
5dac1dae JJ |
3688 | else if (TREE_CODE (type) == COMPLEX_TYPE |
3689 | || TREE_CODE (type) == VECTOR_TYPE) | |
3690 | DECL_GIMPLE_REG_P (local) = 1; | |
4744afba RH |
3691 | } |
3692 | else | |
3693 | { | |
5039610b | 3694 | tree ptr_type, addr; |
4744afba RH |
3695 | |
3696 | ptr_type = build_pointer_type (type); | |
c98b08ff | 3697 | addr = create_tmp_reg (ptr_type, get_name (parm)); |
4744afba RH |
3698 | DECL_IGNORED_P (addr) = 0; |
3699 | local = build_fold_indirect_ref (addr); | |
3700 | ||
e79983f4 | 3701 | t = builtin_decl_explicit (BUILT_IN_ALLOCA_WITH_ALIGN); |
c28f4b5c | 3702 | t = build_call_expr (t, 2, DECL_SIZE_UNIT (parm), |
13e49da9 TV |
3703 | size_int (DECL_ALIGN (parm))); |
3704 | ||
d3c12306 | 3705 | /* The call has been built for a variable-sized object. */ |
63d2a353 | 3706 | CALL_ALLOCA_FOR_VAR_P (t) = 1; |
4744afba | 3707 | t = fold_convert (ptr_type, t); |
726a989a | 3708 | t = build2 (MODIFY_EXPR, TREE_TYPE (addr), addr, t); |
4744afba RH |
3709 | gimplify_and_add (t, &stmts); |
3710 | } | |
3711 | ||
726a989a | 3712 | gimplify_assign (local, parm, &stmts); |
4744afba | 3713 | |
833b3afe DB |
3714 | SET_DECL_VALUE_EXPR (parm, local); |
3715 | DECL_HAS_VALUE_EXPR_P (parm) = 1; | |
4744afba RH |
3716 | } |
3717 | } | |
3718 | } | |
3719 | ||
9771b263 | 3720 | fnargs.release (); |
3b3f318a | 3721 | |
4744afba RH |
3722 | return stmts; |
3723 | } | |
75dc3319 | 3724 | \f |
6f086dfc RS |
3725 | /* Compute the size and offset from the start of the stacked arguments for a |
3726 | parm passed in mode PASSED_MODE and with type TYPE. | |
3727 | ||
3728 | INITIAL_OFFSET_PTR points to the current offset into the stacked | |
3729 | arguments. | |
3730 | ||
e7949876 AM |
3731 | The starting offset and size for this parm are returned in |
3732 | LOCATE->OFFSET and LOCATE->SIZE, respectively. When IN_REGS is | |
3733 | nonzero, the offset is that of stack slot, which is returned in | |
3734 | LOCATE->SLOT_OFFSET. LOCATE->ALIGNMENT_PAD is the amount of | |
3735 | padding required from the initial offset ptr to the stack slot. | |
6f086dfc | 3736 | |
cc2902df | 3737 | IN_REGS is nonzero if the argument will be passed in registers. It will |
6f086dfc RS |
3738 | never be set if REG_PARM_STACK_SPACE is not defined. |
3739 | ||
2e4ceca5 UW |
3740 | REG_PARM_STACK_SPACE is the number of bytes of stack space reserved |
3741 | for arguments which are passed in registers. | |
3742 | ||
6f086dfc RS |
3743 | FNDECL is the function in which the argument was defined. |
3744 | ||
3745 | There are two types of rounding that are done. The first, controlled by | |
c2ed6cf8 NF |
3746 | TARGET_FUNCTION_ARG_BOUNDARY, forces the offset from the start of the |
3747 | argument list to be aligned to the specific boundary (in bits). This | |
3748 | rounding affects the initial and starting offsets, but not the argument | |
3749 | size. | |
6f086dfc RS |
3750 | |
3751 | The second, controlled by FUNCTION_ARG_PADDING and PARM_BOUNDARY, | |
3752 | optionally rounds the size of the parm to PARM_BOUNDARY. The | |
3753 | initial offset is not affected by this rounding, while the size always | |
3754 | is and the starting offset may be. */ | |
3755 | ||
e7949876 AM |
3756 | /* LOCATE->OFFSET will be negative for ARGS_GROW_DOWNWARD case; |
3757 | INITIAL_OFFSET_PTR is positive because locate_and_pad_parm's | |
6f086dfc | 3758 | callers pass in the total size of args so far as |
e7949876 | 3759 | INITIAL_OFFSET_PTR. LOCATE->SIZE is always positive. */ |
6f086dfc | 3760 | |
6f086dfc | 3761 | void |
ef4bddc2 | 3762 | locate_and_pad_parm (machine_mode passed_mode, tree type, int in_regs, |
2e4ceca5 UW |
3763 | int reg_parm_stack_space, int partial, |
3764 | tree fndecl ATTRIBUTE_UNUSED, | |
fa8db1f7 AJ |
3765 | struct args_size *initial_offset_ptr, |
3766 | struct locate_and_pad_arg_data *locate) | |
6f086dfc | 3767 | { |
e7949876 AM |
3768 | tree sizetree; |
3769 | enum direction where_pad; | |
123148b5 | 3770 | unsigned int boundary, round_boundary; |
e7949876 | 3771 | int part_size_in_regs; |
6f086dfc | 3772 | |
6f086dfc RS |
3773 | /* If we have found a stack parm before we reach the end of the |
3774 | area reserved for registers, skip that area. */ | |
3775 | if (! in_regs) | |
3776 | { | |
6f086dfc RS |
3777 | if (reg_parm_stack_space > 0) |
3778 | { | |
3779 | if (initial_offset_ptr->var) | |
3780 | { | |
3781 | initial_offset_ptr->var | |
3782 | = size_binop (MAX_EXPR, ARGS_SIZE_TREE (*initial_offset_ptr), | |
fed3cef0 | 3783 | ssize_int (reg_parm_stack_space)); |
6f086dfc RS |
3784 | initial_offset_ptr->constant = 0; |
3785 | } | |
3786 | else if (initial_offset_ptr->constant < reg_parm_stack_space) | |
3787 | initial_offset_ptr->constant = reg_parm_stack_space; | |
3788 | } | |
3789 | } | |
6f086dfc | 3790 | |
78a52f11 | 3791 | part_size_in_regs = (reg_parm_stack_space == 0 ? partial : 0); |
e7949876 AM |
3792 | |
3793 | sizetree | |
3794 | = type ? size_in_bytes (type) : size_int (GET_MODE_SIZE (passed_mode)); | |
3795 | where_pad = FUNCTION_ARG_PADDING (passed_mode, type); | |
c2ed6cf8 | 3796 | boundary = targetm.calls.function_arg_boundary (passed_mode, type); |
123148b5 BS |
3797 | round_boundary = targetm.calls.function_arg_round_boundary (passed_mode, |
3798 | type); | |
6e985040 | 3799 | locate->where_pad = where_pad; |
2e3f842f L |
3800 | |
3801 | /* Alignment can't exceed MAX_SUPPORTED_STACK_ALIGNMENT. */ | |
3802 | if (boundary > MAX_SUPPORTED_STACK_ALIGNMENT) | |
3803 | boundary = MAX_SUPPORTED_STACK_ALIGNMENT; | |
3804 | ||
bfc45551 | 3805 | locate->boundary = boundary; |
6f086dfc | 3806 | |
2e3f842f L |
3807 | if (SUPPORTS_STACK_ALIGNMENT) |
3808 | { | |
3809 | /* stack_alignment_estimated can't change after stack has been | |
3810 | realigned. */ | |
3811 | if (crtl->stack_alignment_estimated < boundary) | |
3812 | { | |
3813 | if (!crtl->stack_realign_processed) | |
3814 | crtl->stack_alignment_estimated = boundary; | |
3815 | else | |
3816 | { | |
3817 | /* If stack is realigned and stack alignment value | |
3818 | hasn't been finalized, it is OK not to increase | |
3819 | stack_alignment_estimated. The bigger alignment | |
3820 | requirement is recorded in stack_alignment_needed | |
3821 | below. */ | |
3822 | gcc_assert (!crtl->stack_realign_finalized | |
3823 | && crtl->stack_realign_needed); | |
3824 | } | |
3825 | } | |
3826 | } | |
3827 | ||
c7e777b5 RH |
3828 | /* Remember if the outgoing parameter requires extra alignment on the |
3829 | calling function side. */ | |
cb91fab0 JH |
3830 | if (crtl->stack_alignment_needed < boundary) |
3831 | crtl->stack_alignment_needed = boundary; | |
2e3f842f L |
3832 | if (crtl->preferred_stack_boundary < boundary) |
3833 | crtl->preferred_stack_boundary = boundary; | |
c7e777b5 | 3834 | |
6f086dfc | 3835 | #ifdef ARGS_GROW_DOWNWARD |
e7949876 | 3836 | locate->slot_offset.constant = -initial_offset_ptr->constant; |
6f086dfc | 3837 | if (initial_offset_ptr->var) |
e7949876 AM |
3838 | locate->slot_offset.var = size_binop (MINUS_EXPR, ssize_int (0), |
3839 | initial_offset_ptr->var); | |
9dff28ab | 3840 | |
e7949876 AM |
3841 | { |
3842 | tree s2 = sizetree; | |
3843 | if (where_pad != none | |
cc269bb6 | 3844 | && (!tree_fits_uhwi_p (sizetree) |
ae7e9ddd | 3845 | || (tree_to_uhwi (sizetree) * BITS_PER_UNIT) % round_boundary)) |
123148b5 | 3846 | s2 = round_up (s2, round_boundary / BITS_PER_UNIT); |
e7949876 AM |
3847 | SUB_PARM_SIZE (locate->slot_offset, s2); |
3848 | } | |
3849 | ||
3850 | locate->slot_offset.constant += part_size_in_regs; | |
9dff28ab | 3851 | |
2e4ceca5 | 3852 | if (!in_regs || reg_parm_stack_space > 0) |
e7949876 AM |
3853 | pad_to_arg_alignment (&locate->slot_offset, boundary, |
3854 | &locate->alignment_pad); | |
9dff28ab | 3855 | |
e7949876 AM |
3856 | locate->size.constant = (-initial_offset_ptr->constant |
3857 | - locate->slot_offset.constant); | |
6f086dfc | 3858 | if (initial_offset_ptr->var) |
e7949876 AM |
3859 | locate->size.var = size_binop (MINUS_EXPR, |
3860 | size_binop (MINUS_EXPR, | |
3861 | ssize_int (0), | |
3862 | initial_offset_ptr->var), | |
3863 | locate->slot_offset.var); | |
3864 | ||
3865 | /* Pad_below needs the pre-rounded size to know how much to pad | |
3866 | below. */ | |
3867 | locate->offset = locate->slot_offset; | |
3868 | if (where_pad == downward) | |
3869 | pad_below (&locate->offset, passed_mode, sizetree); | |
9dff28ab | 3870 | |
6f086dfc | 3871 | #else /* !ARGS_GROW_DOWNWARD */ |
2e4ceca5 | 3872 | if (!in_regs || reg_parm_stack_space > 0) |
e7949876 AM |
3873 | pad_to_arg_alignment (initial_offset_ptr, boundary, |
3874 | &locate->alignment_pad); | |
3875 | locate->slot_offset = *initial_offset_ptr; | |
6f086dfc RS |
3876 | |
3877 | #ifdef PUSH_ROUNDING | |
3878 | if (passed_mode != BLKmode) | |
3879 | sizetree = size_int (PUSH_ROUNDING (TREE_INT_CST_LOW (sizetree))); | |
3880 | #endif | |
3881 | ||
d4b0a7a0 DE |
3882 | /* Pad_below needs the pre-rounded size to know how much to pad below |
3883 | so this must be done before rounding up. */ | |
e7949876 AM |
3884 | locate->offset = locate->slot_offset; |
3885 | if (where_pad == downward) | |
3886 | pad_below (&locate->offset, passed_mode, sizetree); | |
d4b0a7a0 | 3887 | |
6f086dfc | 3888 | if (where_pad != none |
cc269bb6 | 3889 | && (!tree_fits_uhwi_p (sizetree) |
ae7e9ddd | 3890 | || (tree_to_uhwi (sizetree) * BITS_PER_UNIT) % round_boundary)) |
123148b5 | 3891 | sizetree = round_up (sizetree, round_boundary / BITS_PER_UNIT); |
6f086dfc | 3892 | |
e7949876 AM |
3893 | ADD_PARM_SIZE (locate->size, sizetree); |
3894 | ||
3895 | locate->size.constant -= part_size_in_regs; | |
6f086dfc | 3896 | #endif /* ARGS_GROW_DOWNWARD */ |
099590dc MM |
3897 | |
3898 | #ifdef FUNCTION_ARG_OFFSET | |
3899 | locate->offset.constant += FUNCTION_ARG_OFFSET (passed_mode, type); | |
3900 | #endif | |
6f086dfc RS |
3901 | } |
3902 | ||
e16c591a RS |
3903 | /* Round the stack offset in *OFFSET_PTR up to a multiple of BOUNDARY. |
3904 | BOUNDARY is measured in bits, but must be a multiple of a storage unit. */ | |
3905 | ||
6f086dfc | 3906 | static void |
fa8db1f7 AJ |
3907 | pad_to_arg_alignment (struct args_size *offset_ptr, int boundary, |
3908 | struct args_size *alignment_pad) | |
6f086dfc | 3909 | { |
a544cfd2 KG |
3910 | tree save_var = NULL_TREE; |
3911 | HOST_WIDE_INT save_constant = 0; | |
a751cd5b | 3912 | int boundary_in_bytes = boundary / BITS_PER_UNIT; |
a594a19c GK |
3913 | HOST_WIDE_INT sp_offset = STACK_POINTER_OFFSET; |
3914 | ||
3915 | #ifdef SPARC_STACK_BOUNDARY_HACK | |
2358ff91 EB |
3916 | /* ??? The SPARC port may claim a STACK_BOUNDARY higher than |
3917 | the real alignment of %sp. However, when it does this, the | |
3918 | alignment of %sp+STACK_POINTER_OFFSET is STACK_BOUNDARY. */ | |
a594a19c GK |
3919 | if (SPARC_STACK_BOUNDARY_HACK) |
3920 | sp_offset = 0; | |
3921 | #endif | |
4fc026cd | 3922 | |
6f6b8f81 | 3923 | if (boundary > PARM_BOUNDARY) |
4fc026cd CM |
3924 | { |
3925 | save_var = offset_ptr->var; | |
3926 | save_constant = offset_ptr->constant; | |
3927 | } | |
3928 | ||
3929 | alignment_pad->var = NULL_TREE; | |
3930 | alignment_pad->constant = 0; | |
4fc026cd | 3931 | |
6f086dfc RS |
3932 | if (boundary > BITS_PER_UNIT) |
3933 | { | |
3934 | if (offset_ptr->var) | |
3935 | { | |
a594a19c GK |
3936 | tree sp_offset_tree = ssize_int (sp_offset); |
3937 | tree offset = size_binop (PLUS_EXPR, | |
3938 | ARGS_SIZE_TREE (*offset_ptr), | |
3939 | sp_offset_tree); | |
6f086dfc | 3940 | #ifdef ARGS_GROW_DOWNWARD |
a594a19c | 3941 | tree rounded = round_down (offset, boundary / BITS_PER_UNIT); |
6f086dfc | 3942 | #else |
a594a19c | 3943 | tree rounded = round_up (offset, boundary / BITS_PER_UNIT); |
6f086dfc | 3944 | #endif |
a594a19c GK |
3945 | |
3946 | offset_ptr->var = size_binop (MINUS_EXPR, rounded, sp_offset_tree); | |
e7949876 AM |
3947 | /* ARGS_SIZE_TREE includes constant term. */ |
3948 | offset_ptr->constant = 0; | |
6f6b8f81 | 3949 | if (boundary > PARM_BOUNDARY) |
dd3f0101 | 3950 | alignment_pad->var = size_binop (MINUS_EXPR, offset_ptr->var, |
fed3cef0 | 3951 | save_var); |
6f086dfc RS |
3952 | } |
3953 | else | |
718fe406 | 3954 | { |
a594a19c | 3955 | offset_ptr->constant = -sp_offset + |
6f086dfc | 3956 | #ifdef ARGS_GROW_DOWNWARD |
a594a19c | 3957 | FLOOR_ROUND (offset_ptr->constant + sp_offset, boundary_in_bytes); |
6f086dfc | 3958 | #else |
a594a19c | 3959 | CEIL_ROUND (offset_ptr->constant + sp_offset, boundary_in_bytes); |
6f086dfc | 3960 | #endif |
6f6b8f81 | 3961 | if (boundary > PARM_BOUNDARY) |
718fe406 KH |
3962 | alignment_pad->constant = offset_ptr->constant - save_constant; |
3963 | } | |
6f086dfc RS |
3964 | } |
3965 | } | |
3966 | ||
3967 | static void | |
ef4bddc2 | 3968 | pad_below (struct args_size *offset_ptr, machine_mode passed_mode, tree sizetree) |
6f086dfc RS |
3969 | { |
3970 | if (passed_mode != BLKmode) | |
3971 | { | |
3972 | if (GET_MODE_BITSIZE (passed_mode) % PARM_BOUNDARY) | |
3973 | offset_ptr->constant | |
3974 | += (((GET_MODE_BITSIZE (passed_mode) + PARM_BOUNDARY - 1) | |
3975 | / PARM_BOUNDARY * PARM_BOUNDARY / BITS_PER_UNIT) | |
3976 | - GET_MODE_SIZE (passed_mode)); | |
3977 | } | |
3978 | else | |
3979 | { | |
3980 | if (TREE_CODE (sizetree) != INTEGER_CST | |
3981 | || (TREE_INT_CST_LOW (sizetree) * BITS_PER_UNIT) % PARM_BOUNDARY) | |
3982 | { | |
3983 | /* Round the size up to multiple of PARM_BOUNDARY bits. */ | |
3984 | tree s2 = round_up (sizetree, PARM_BOUNDARY / BITS_PER_UNIT); | |
3985 | /* Add it in. */ | |
3986 | ADD_PARM_SIZE (*offset_ptr, s2); | |
3987 | SUB_PARM_SIZE (*offset_ptr, sizetree); | |
3988 | } | |
3989 | } | |
3990 | } | |
6f086dfc | 3991 | \f |
6f086dfc | 3992 | |
6fb5fa3c DB |
3993 | /* True if register REGNO was alive at a place where `setjmp' was |
3994 | called and was set more than once or is an argument. Such regs may | |
3995 | be clobbered by `longjmp'. */ | |
3996 | ||
3997 | static bool | |
3998 | regno_clobbered_at_setjmp (bitmap setjmp_crosses, int regno) | |
3999 | { | |
4000 | /* There appear to be cases where some local vars never reach the | |
4001 | backend but have bogus regnos. */ | |
4002 | if (regno >= max_reg_num ()) | |
4003 | return false; | |
4004 | ||
4005 | return ((REG_N_SETS (regno) > 1 | |
fefa31b5 DM |
4006 | || REGNO_REG_SET_P (df_get_live_out (ENTRY_BLOCK_PTR_FOR_FN (cfun)), |
4007 | regno)) | |
6fb5fa3c DB |
4008 | && REGNO_REG_SET_P (setjmp_crosses, regno)); |
4009 | } | |
4010 | ||
4011 | /* Walk the tree of blocks describing the binding levels within a | |
4012 | function and warn about variables the might be killed by setjmp or | |
4013 | vfork. This is done after calling flow_analysis before register | |
4014 | allocation since that will clobber the pseudo-regs to hard | |
4015 | regs. */ | |
4016 | ||
4017 | static void | |
4018 | setjmp_vars_warning (bitmap setjmp_crosses, tree block) | |
6f086dfc | 4019 | { |
b3694847 | 4020 | tree decl, sub; |
6de9cd9a | 4021 | |
910ad8de | 4022 | for (decl = BLOCK_VARS (block); decl; decl = DECL_CHAIN (decl)) |
6f086dfc | 4023 | { |
6de9cd9a | 4024 | if (TREE_CODE (decl) == VAR_DECL |
bc41842b | 4025 | && DECL_RTL_SET_P (decl) |
f8cfc6aa | 4026 | && REG_P (DECL_RTL (decl)) |
6fb5fa3c | 4027 | && regno_clobbered_at_setjmp (setjmp_crosses, REGNO (DECL_RTL (decl)))) |
b8698a0f | 4028 | warning (OPT_Wclobbered, "variable %q+D might be clobbered by" |
2b001724 | 4029 | " %<longjmp%> or %<vfork%>", decl); |
6f086dfc | 4030 | } |
6de9cd9a | 4031 | |
87caf699 | 4032 | for (sub = BLOCK_SUBBLOCKS (block); sub; sub = BLOCK_CHAIN (sub)) |
6fb5fa3c | 4033 | setjmp_vars_warning (setjmp_crosses, sub); |
6f086dfc RS |
4034 | } |
4035 | ||
6de9cd9a | 4036 | /* Do the appropriate part of setjmp_vars_warning |
6f086dfc RS |
4037 | but for arguments instead of local variables. */ |
4038 | ||
6fb5fa3c DB |
4039 | static void |
4040 | setjmp_args_warning (bitmap setjmp_crosses) | |
6f086dfc | 4041 | { |
b3694847 | 4042 | tree decl; |
6f086dfc | 4043 | for (decl = DECL_ARGUMENTS (current_function_decl); |
910ad8de | 4044 | decl; decl = DECL_CHAIN (decl)) |
6f086dfc | 4045 | if (DECL_RTL (decl) != 0 |
f8cfc6aa | 4046 | && REG_P (DECL_RTL (decl)) |
6fb5fa3c | 4047 | && regno_clobbered_at_setjmp (setjmp_crosses, REGNO (DECL_RTL (decl)))) |
b8698a0f | 4048 | warning (OPT_Wclobbered, |
2b001724 | 4049 | "argument %q+D might be clobbered by %<longjmp%> or %<vfork%>", |
dee15844 | 4050 | decl); |
6f086dfc RS |
4051 | } |
4052 | ||
6fb5fa3c DB |
4053 | /* Generate warning messages for variables live across setjmp. */ |
4054 | ||
b8698a0f | 4055 | void |
6fb5fa3c DB |
4056 | generate_setjmp_warnings (void) |
4057 | { | |
4058 | bitmap setjmp_crosses = regstat_get_setjmp_crosses (); | |
4059 | ||
0cae8d31 | 4060 | if (n_basic_blocks_for_fn (cfun) == NUM_FIXED_BLOCKS |
6fb5fa3c DB |
4061 | || bitmap_empty_p (setjmp_crosses)) |
4062 | return; | |
4063 | ||
4064 | setjmp_vars_warning (setjmp_crosses, DECL_INITIAL (current_function_decl)); | |
4065 | setjmp_args_warning (setjmp_crosses); | |
4066 | } | |
4067 | ||
6f086dfc | 4068 | \f |
3373692b | 4069 | /* Reverse the order of elements in the fragment chain T of blocks, |
1e3c1d95 JJ |
4070 | and return the new head of the chain (old last element). |
4071 | In addition to that clear BLOCK_SAME_RANGE flags when needed | |
4072 | and adjust BLOCK_SUPERCONTEXT from the super fragment to | |
4073 | its super fragment origin. */ | |
3373692b JJ |
4074 | |
4075 | static tree | |
4076 | block_fragments_nreverse (tree t) | |
4077 | { | |
1e3c1d95 JJ |
4078 | tree prev = 0, block, next, prev_super = 0; |
4079 | tree super = BLOCK_SUPERCONTEXT (t); | |
4080 | if (BLOCK_FRAGMENT_ORIGIN (super)) | |
4081 | super = BLOCK_FRAGMENT_ORIGIN (super); | |
3373692b JJ |
4082 | for (block = t; block; block = next) |
4083 | { | |
4084 | next = BLOCK_FRAGMENT_CHAIN (block); | |
4085 | BLOCK_FRAGMENT_CHAIN (block) = prev; | |
1e3c1d95 JJ |
4086 | if ((prev && !BLOCK_SAME_RANGE (prev)) |
4087 | || (BLOCK_FRAGMENT_CHAIN (BLOCK_SUPERCONTEXT (block)) | |
4088 | != prev_super)) | |
4089 | BLOCK_SAME_RANGE (block) = 0; | |
4090 | prev_super = BLOCK_SUPERCONTEXT (block); | |
4091 | BLOCK_SUPERCONTEXT (block) = super; | |
3373692b JJ |
4092 | prev = block; |
4093 | } | |
1e3c1d95 JJ |
4094 | t = BLOCK_FRAGMENT_ORIGIN (t); |
4095 | if (BLOCK_FRAGMENT_CHAIN (BLOCK_SUPERCONTEXT (t)) | |
4096 | != prev_super) | |
4097 | BLOCK_SAME_RANGE (t) = 0; | |
4098 | BLOCK_SUPERCONTEXT (t) = super; | |
3373692b JJ |
4099 | return prev; |
4100 | } | |
4101 | ||
4102 | /* Reverse the order of elements in the chain T of blocks, | |
4103 | and return the new head of the chain (old last element). | |
4104 | Also do the same on subblocks and reverse the order of elements | |
4105 | in BLOCK_FRAGMENT_CHAIN as well. */ | |
4106 | ||
4107 | static tree | |
4108 | blocks_nreverse_all (tree t) | |
4109 | { | |
4110 | tree prev = 0, block, next; | |
4111 | for (block = t; block; block = next) | |
4112 | { | |
4113 | next = BLOCK_CHAIN (block); | |
4114 | BLOCK_CHAIN (block) = prev; | |
3373692b JJ |
4115 | if (BLOCK_FRAGMENT_CHAIN (block) |
4116 | && BLOCK_FRAGMENT_ORIGIN (block) == NULL_TREE) | |
1e3c1d95 JJ |
4117 | { |
4118 | BLOCK_FRAGMENT_CHAIN (block) | |
4119 | = block_fragments_nreverse (BLOCK_FRAGMENT_CHAIN (block)); | |
4120 | if (!BLOCK_SAME_RANGE (BLOCK_FRAGMENT_CHAIN (block))) | |
4121 | BLOCK_SAME_RANGE (block) = 0; | |
4122 | } | |
4123 | BLOCK_SUBBLOCKS (block) = blocks_nreverse_all (BLOCK_SUBBLOCKS (block)); | |
3373692b JJ |
4124 | prev = block; |
4125 | } | |
4126 | return prev; | |
4127 | } | |
4128 | ||
4129 | ||
a20612aa RH |
4130 | /* Identify BLOCKs referenced by more than one NOTE_INSN_BLOCK_{BEG,END}, |
4131 | and create duplicate blocks. */ | |
4132 | /* ??? Need an option to either create block fragments or to create | |
4133 | abstract origin duplicates of a source block. It really depends | |
4134 | on what optimization has been performed. */ | |
467456d0 | 4135 | |
116eebd6 | 4136 | void |
fa8db1f7 | 4137 | reorder_blocks (void) |
467456d0 | 4138 | { |
116eebd6 | 4139 | tree block = DECL_INITIAL (current_function_decl); |
467456d0 | 4140 | |
1a4450c7 | 4141 | if (block == NULL_TREE) |
116eebd6 | 4142 | return; |
fc289cd1 | 4143 | |
00f96dc9 | 4144 | auto_vec<tree, 10> block_stack; |
18c038b9 | 4145 | |
a20612aa | 4146 | /* Reset the TREE_ASM_WRITTEN bit for all blocks. */ |
6de9cd9a | 4147 | clear_block_marks (block); |
a20612aa | 4148 | |
116eebd6 MM |
4149 | /* Prune the old trees away, so that they don't get in the way. */ |
4150 | BLOCK_SUBBLOCKS (block) = NULL_TREE; | |
4151 | BLOCK_CHAIN (block) = NULL_TREE; | |
fc289cd1 | 4152 | |
a20612aa | 4153 | /* Recreate the block tree from the note nesting. */ |
116eebd6 | 4154 | reorder_blocks_1 (get_insns (), block, &block_stack); |
3373692b | 4155 | BLOCK_SUBBLOCKS (block) = blocks_nreverse_all (BLOCK_SUBBLOCKS (block)); |
467456d0 RS |
4156 | } |
4157 | ||
a20612aa | 4158 | /* Helper function for reorder_blocks. Reset TREE_ASM_WRITTEN. */ |
0a1c58a2 | 4159 | |
6de9cd9a DN |
4160 | void |
4161 | clear_block_marks (tree block) | |
cc1fe44f | 4162 | { |
a20612aa | 4163 | while (block) |
cc1fe44f | 4164 | { |
a20612aa | 4165 | TREE_ASM_WRITTEN (block) = 0; |
6de9cd9a | 4166 | clear_block_marks (BLOCK_SUBBLOCKS (block)); |
a20612aa | 4167 | block = BLOCK_CHAIN (block); |
cc1fe44f DD |
4168 | } |
4169 | } | |
4170 | ||
0a1c58a2 | 4171 | static void |
691fe203 DM |
4172 | reorder_blocks_1 (rtx_insn *insns, tree current_block, |
4173 | vec<tree> *p_block_stack) | |
0a1c58a2 | 4174 | { |
691fe203 | 4175 | rtx_insn *insn; |
1e3c1d95 | 4176 | tree prev_beg = NULL_TREE, prev_end = NULL_TREE; |
0a1c58a2 JL |
4177 | |
4178 | for (insn = insns; insn; insn = NEXT_INSN (insn)) | |
4179 | { | |
4b4bf941 | 4180 | if (NOTE_P (insn)) |
0a1c58a2 | 4181 | { |
a38e7aa5 | 4182 | if (NOTE_KIND (insn) == NOTE_INSN_BLOCK_BEG) |
0a1c58a2 JL |
4183 | { |
4184 | tree block = NOTE_BLOCK (insn); | |
51b7d006 DJ |
4185 | tree origin; |
4186 | ||
3373692b JJ |
4187 | gcc_assert (BLOCK_FRAGMENT_ORIGIN (block) == NULL_TREE); |
4188 | origin = block; | |
a20612aa | 4189 | |
1e3c1d95 JJ |
4190 | if (prev_end) |
4191 | BLOCK_SAME_RANGE (prev_end) = 0; | |
4192 | prev_end = NULL_TREE; | |
4193 | ||
a20612aa RH |
4194 | /* If we have seen this block before, that means it now |
4195 | spans multiple address regions. Create a new fragment. */ | |
0a1c58a2 JL |
4196 | if (TREE_ASM_WRITTEN (block)) |
4197 | { | |
a20612aa | 4198 | tree new_block = copy_node (block); |
a20612aa | 4199 | |
1e3c1d95 | 4200 | BLOCK_SAME_RANGE (new_block) = 0; |
a20612aa RH |
4201 | BLOCK_FRAGMENT_ORIGIN (new_block) = origin; |
4202 | BLOCK_FRAGMENT_CHAIN (new_block) | |
4203 | = BLOCK_FRAGMENT_CHAIN (origin); | |
4204 | BLOCK_FRAGMENT_CHAIN (origin) = new_block; | |
4205 | ||
4206 | NOTE_BLOCK (insn) = new_block; | |
4207 | block = new_block; | |
0a1c58a2 | 4208 | } |
a20612aa | 4209 | |
1e3c1d95 JJ |
4210 | if (prev_beg == current_block && prev_beg) |
4211 | BLOCK_SAME_RANGE (block) = 1; | |
4212 | ||
4213 | prev_beg = origin; | |
4214 | ||
0a1c58a2 JL |
4215 | BLOCK_SUBBLOCKS (block) = 0; |
4216 | TREE_ASM_WRITTEN (block) = 1; | |
339a28b9 ZW |
4217 | /* When there's only one block for the entire function, |
4218 | current_block == block and we mustn't do this, it | |
4219 | will cause infinite recursion. */ | |
4220 | if (block != current_block) | |
4221 | { | |
1e3c1d95 | 4222 | tree super; |
51b7d006 | 4223 | if (block != origin) |
1e3c1d95 JJ |
4224 | gcc_assert (BLOCK_SUPERCONTEXT (origin) == current_block |
4225 | || BLOCK_FRAGMENT_ORIGIN (BLOCK_SUPERCONTEXT | |
4226 | (origin)) | |
4227 | == current_block); | |
9771b263 | 4228 | if (p_block_stack->is_empty ()) |
1e3c1d95 JJ |
4229 | super = current_block; |
4230 | else | |
4231 | { | |
9771b263 | 4232 | super = p_block_stack->last (); |
1e3c1d95 JJ |
4233 | gcc_assert (super == current_block |
4234 | || BLOCK_FRAGMENT_ORIGIN (super) | |
4235 | == current_block); | |
4236 | } | |
4237 | BLOCK_SUPERCONTEXT (block) = super; | |
339a28b9 ZW |
4238 | BLOCK_CHAIN (block) = BLOCK_SUBBLOCKS (current_block); |
4239 | BLOCK_SUBBLOCKS (current_block) = block; | |
51b7d006 | 4240 | current_block = origin; |
339a28b9 | 4241 | } |
9771b263 | 4242 | p_block_stack->safe_push (block); |
0a1c58a2 | 4243 | } |
a38e7aa5 | 4244 | else if (NOTE_KIND (insn) == NOTE_INSN_BLOCK_END) |
0a1c58a2 | 4245 | { |
9771b263 | 4246 | NOTE_BLOCK (insn) = p_block_stack->pop (); |
0a1c58a2 | 4247 | current_block = BLOCK_SUPERCONTEXT (current_block); |
1e3c1d95 JJ |
4248 | if (BLOCK_FRAGMENT_ORIGIN (current_block)) |
4249 | current_block = BLOCK_FRAGMENT_ORIGIN (current_block); | |
4250 | prev_beg = NULL_TREE; | |
4251 | prev_end = BLOCK_SAME_RANGE (NOTE_BLOCK (insn)) | |
4252 | ? NOTE_BLOCK (insn) : NULL_TREE; | |
0a1c58a2 JL |
4253 | } |
4254 | } | |
1e3c1d95 JJ |
4255 | else |
4256 | { | |
4257 | prev_beg = NULL_TREE; | |
4258 | if (prev_end) | |
4259 | BLOCK_SAME_RANGE (prev_end) = 0; | |
4260 | prev_end = NULL_TREE; | |
4261 | } | |
0a1c58a2 JL |
4262 | } |
4263 | } | |
4264 | ||
467456d0 RS |
4265 | /* Reverse the order of elements in the chain T of blocks, |
4266 | and return the new head of the chain (old last element). */ | |
4267 | ||
6de9cd9a | 4268 | tree |
fa8db1f7 | 4269 | blocks_nreverse (tree t) |
467456d0 | 4270 | { |
3373692b JJ |
4271 | tree prev = 0, block, next; |
4272 | for (block = t; block; block = next) | |
467456d0 | 4273 | { |
3373692b JJ |
4274 | next = BLOCK_CHAIN (block); |
4275 | BLOCK_CHAIN (block) = prev; | |
4276 | prev = block; | |
467456d0 RS |
4277 | } |
4278 | return prev; | |
4279 | } | |
4280 | ||
61e46a7d NF |
4281 | /* Concatenate two chains of blocks (chained through BLOCK_CHAIN) |
4282 | by modifying the last node in chain 1 to point to chain 2. */ | |
4283 | ||
4284 | tree | |
4285 | block_chainon (tree op1, tree op2) | |
4286 | { | |
4287 | tree t1; | |
4288 | ||
4289 | if (!op1) | |
4290 | return op2; | |
4291 | if (!op2) | |
4292 | return op1; | |
4293 | ||
4294 | for (t1 = op1; BLOCK_CHAIN (t1); t1 = BLOCK_CHAIN (t1)) | |
4295 | continue; | |
4296 | BLOCK_CHAIN (t1) = op2; | |
4297 | ||
4298 | #ifdef ENABLE_TREE_CHECKING | |
4299 | { | |
4300 | tree t2; | |
4301 | for (t2 = op2; t2; t2 = BLOCK_CHAIN (t2)) | |
4302 | gcc_assert (t2 != t1); | |
4303 | } | |
4304 | #endif | |
4305 | ||
4306 | return op1; | |
4307 | } | |
4308 | ||
18c038b9 MM |
4309 | /* Count the subblocks of the list starting with BLOCK. If VECTOR is |
4310 | non-NULL, list them all into VECTOR, in a depth-first preorder | |
4311 | traversal of the block tree. Also clear TREE_ASM_WRITTEN in all | |
b2a59b15 | 4312 | blocks. */ |
467456d0 RS |
4313 | |
4314 | static int | |
fa8db1f7 | 4315 | all_blocks (tree block, tree *vector) |
467456d0 | 4316 | { |
b2a59b15 MS |
4317 | int n_blocks = 0; |
4318 | ||
a84efb51 JO |
4319 | while (block) |
4320 | { | |
4321 | TREE_ASM_WRITTEN (block) = 0; | |
b2a59b15 | 4322 | |
a84efb51 JO |
4323 | /* Record this block. */ |
4324 | if (vector) | |
4325 | vector[n_blocks] = block; | |
b2a59b15 | 4326 | |
a84efb51 | 4327 | ++n_blocks; |
718fe406 | 4328 | |
a84efb51 JO |
4329 | /* Record the subblocks, and their subblocks... */ |
4330 | n_blocks += all_blocks (BLOCK_SUBBLOCKS (block), | |
4331 | vector ? vector + n_blocks : 0); | |
4332 | block = BLOCK_CHAIN (block); | |
4333 | } | |
467456d0 RS |
4334 | |
4335 | return n_blocks; | |
4336 | } | |
18c038b9 MM |
4337 | |
4338 | /* Return a vector containing all the blocks rooted at BLOCK. The | |
4339 | number of elements in the vector is stored in N_BLOCKS_P. The | |
4340 | vector is dynamically allocated; it is the caller's responsibility | |
4341 | to call `free' on the pointer returned. */ | |
718fe406 | 4342 | |
18c038b9 | 4343 | static tree * |
fa8db1f7 | 4344 | get_block_vector (tree block, int *n_blocks_p) |
18c038b9 MM |
4345 | { |
4346 | tree *block_vector; | |
4347 | ||
4348 | *n_blocks_p = all_blocks (block, NULL); | |
5ed6ace5 | 4349 | block_vector = XNEWVEC (tree, *n_blocks_p); |
18c038b9 MM |
4350 | all_blocks (block, block_vector); |
4351 | ||
4352 | return block_vector; | |
4353 | } | |
4354 | ||
f83b236e | 4355 | static GTY(()) int next_block_index = 2; |
18c038b9 MM |
4356 | |
4357 | /* Set BLOCK_NUMBER for all the blocks in FN. */ | |
4358 | ||
4359 | void | |
fa8db1f7 | 4360 | number_blocks (tree fn) |
18c038b9 MM |
4361 | { |
4362 | int i; | |
4363 | int n_blocks; | |
4364 | tree *block_vector; | |
4365 | ||
4366 | /* For SDB and XCOFF debugging output, we start numbering the blocks | |
4367 | from 1 within each function, rather than keeping a running | |
4368 | count. */ | |
4369 | #if defined (SDB_DEBUGGING_INFO) || defined (XCOFF_DEBUGGING_INFO) | |
b0e3a658 RK |
4370 | if (write_symbols == SDB_DEBUG || write_symbols == XCOFF_DEBUG) |
4371 | next_block_index = 1; | |
18c038b9 MM |
4372 | #endif |
4373 | ||
4374 | block_vector = get_block_vector (DECL_INITIAL (fn), &n_blocks); | |
4375 | ||
4376 | /* The top-level BLOCK isn't numbered at all. */ | |
4377 | for (i = 1; i < n_blocks; ++i) | |
4378 | /* We number the blocks from two. */ | |
4379 | BLOCK_NUMBER (block_vector[i]) = next_block_index++; | |
4380 | ||
4381 | free (block_vector); | |
4382 | ||
4383 | return; | |
4384 | } | |
df8992f8 RH |
4385 | |
4386 | /* If VAR is present in a subblock of BLOCK, return the subblock. */ | |
4387 | ||
24e47c76 | 4388 | DEBUG_FUNCTION tree |
fa8db1f7 | 4389 | debug_find_var_in_block_tree (tree var, tree block) |
df8992f8 RH |
4390 | { |
4391 | tree t; | |
4392 | ||
4393 | for (t = BLOCK_VARS (block); t; t = TREE_CHAIN (t)) | |
4394 | if (t == var) | |
4395 | return block; | |
4396 | ||
4397 | for (t = BLOCK_SUBBLOCKS (block); t; t = TREE_CHAIN (t)) | |
4398 | { | |
4399 | tree ret = debug_find_var_in_block_tree (var, t); | |
4400 | if (ret) | |
4401 | return ret; | |
4402 | } | |
4403 | ||
4404 | return NULL_TREE; | |
4405 | } | |
467456d0 | 4406 | \f |
db2960f4 SL |
4407 | /* Keep track of whether we're in a dummy function context. If we are, |
4408 | we don't want to invoke the set_current_function hook, because we'll | |
4409 | get into trouble if the hook calls target_reinit () recursively or | |
4410 | when the initial initialization is not yet complete. */ | |
4411 | ||
4412 | static bool in_dummy_function; | |
4413 | ||
ab442df7 MM |
4414 | /* Invoke the target hook when setting cfun. Update the optimization options |
4415 | if the function uses different options than the default. */ | |
db2960f4 SL |
4416 | |
4417 | static void | |
4418 | invoke_set_current_function_hook (tree fndecl) | |
4419 | { | |
4420 | if (!in_dummy_function) | |
ab442df7 MM |
4421 | { |
4422 | tree opts = ((fndecl) | |
4423 | ? DECL_FUNCTION_SPECIFIC_OPTIMIZATION (fndecl) | |
4424 | : optimization_default_node); | |
4425 | ||
4426 | if (!opts) | |
4427 | opts = optimization_default_node; | |
4428 | ||
4429 | /* Change optimization options if needed. */ | |
4430 | if (optimization_current_node != opts) | |
4431 | { | |
4432 | optimization_current_node = opts; | |
46625112 | 4433 | cl_optimization_restore (&global_options, TREE_OPTIMIZATION (opts)); |
ab442df7 MM |
4434 | } |
4435 | ||
892c4745 | 4436 | targetm.set_current_function (fndecl); |
4b1baac8 | 4437 | this_fn_optabs = this_target_optabs; |
135204dd | 4438 | |
4b1baac8 | 4439 | if (opts != optimization_default_node) |
135204dd | 4440 | { |
4b1baac8 RS |
4441 | init_tree_optimization_optabs (opts); |
4442 | if (TREE_OPTIMIZATION_OPTABS (opts)) | |
4443 | this_fn_optabs = (struct target_optabs *) | |
4444 | TREE_OPTIMIZATION_OPTABS (opts); | |
135204dd | 4445 | } |
ab442df7 | 4446 | } |
db2960f4 SL |
4447 | } |
4448 | ||
4449 | /* cfun should never be set directly; use this function. */ | |
4450 | ||
4451 | void | |
4452 | set_cfun (struct function *new_cfun) | |
4453 | { | |
4454 | if (cfun != new_cfun) | |
4455 | { | |
4456 | cfun = new_cfun; | |
4457 | invoke_set_current_function_hook (new_cfun ? new_cfun->decl : NULL_TREE); | |
4458 | } | |
4459 | } | |
4460 | ||
db2960f4 SL |
4461 | /* Initialized with NOGC, making this poisonous to the garbage collector. */ |
4462 | ||
9771b263 | 4463 | static vec<function_p> cfun_stack; |
db2960f4 | 4464 | |
af16bc76 MJ |
4465 | /* Push the current cfun onto the stack, and set cfun to new_cfun. Also set |
4466 | current_function_decl accordingly. */ | |
db2960f4 SL |
4467 | |
4468 | void | |
4469 | push_cfun (struct function *new_cfun) | |
4470 | { | |
af16bc76 MJ |
4471 | gcc_assert ((!cfun && !current_function_decl) |
4472 | || (cfun && current_function_decl == cfun->decl)); | |
9771b263 | 4473 | cfun_stack.safe_push (cfun); |
af16bc76 | 4474 | current_function_decl = new_cfun ? new_cfun->decl : NULL_TREE; |
db2960f4 SL |
4475 | set_cfun (new_cfun); |
4476 | } | |
4477 | ||
af16bc76 | 4478 | /* Pop cfun from the stack. Also set current_function_decl accordingly. */ |
db2960f4 SL |
4479 | |
4480 | void | |
4481 | pop_cfun (void) | |
4482 | { | |
9771b263 | 4483 | struct function *new_cfun = cfun_stack.pop (); |
af16bc76 MJ |
4484 | /* When in_dummy_function, we do have a cfun but current_function_decl is |
4485 | NULL. We also allow pushing NULL cfun and subsequently changing | |
4486 | current_function_decl to something else and have both restored by | |
4487 | pop_cfun. */ | |
4488 | gcc_checking_assert (in_dummy_function | |
4489 | || !cfun | |
4490 | || current_function_decl == cfun->decl); | |
38d34676 | 4491 | set_cfun (new_cfun); |
af16bc76 | 4492 | current_function_decl = new_cfun ? new_cfun->decl : NULL_TREE; |
db2960f4 | 4493 | } |
3e87758a RL |
4494 | |
4495 | /* Return value of funcdef and increase it. */ | |
4496 | int | |
b8698a0f | 4497 | get_next_funcdef_no (void) |
3e87758a RL |
4498 | { |
4499 | return funcdef_no++; | |
4500 | } | |
4501 | ||
903d1e67 XDL |
4502 | /* Return value of funcdef. */ |
4503 | int | |
4504 | get_last_funcdef_no (void) | |
4505 | { | |
4506 | return funcdef_no; | |
4507 | } | |
4508 | ||
3a70d621 | 4509 | /* Allocate a function structure for FNDECL and set its contents |
db2960f4 SL |
4510 | to the defaults. Set cfun to the newly-allocated object. |
4511 | Some of the helper functions invoked during initialization assume | |
4512 | that cfun has already been set. Therefore, assign the new object | |
4513 | directly into cfun and invoke the back end hook explicitly at the | |
4514 | very end, rather than initializing a temporary and calling set_cfun | |
4515 | on it. | |
182e0d71 AK |
4516 | |
4517 | ABSTRACT_P is true if this is a function that will never be seen by | |
4518 | the middle-end. Such functions are front-end concepts (like C++ | |
4519 | function templates) that do not correspond directly to functions | |
4520 | placed in object files. */ | |
7a80cf9a | 4521 | |
3a70d621 | 4522 | void |
182e0d71 | 4523 | allocate_struct_function (tree fndecl, bool abstract_p) |
6f086dfc | 4524 | { |
6de9cd9a | 4525 | tree fntype = fndecl ? TREE_TYPE (fndecl) : NULL_TREE; |
6f086dfc | 4526 | |
766090c2 | 4527 | cfun = ggc_cleared_alloc<function> (); |
b384405b | 4528 | |
3a70d621 | 4529 | init_eh_for_function (); |
6f086dfc | 4530 | |
3a70d621 RH |
4531 | if (init_machine_status) |
4532 | cfun->machine = (*init_machine_status) (); | |
e2ecd91c | 4533 | |
7c800926 KT |
4534 | #ifdef OVERRIDE_ABI_FORMAT |
4535 | OVERRIDE_ABI_FORMAT (fndecl); | |
4536 | #endif | |
4537 | ||
81464b2c | 4538 | if (fndecl != NULL_TREE) |
3a70d621 | 4539 | { |
db2960f4 SL |
4540 | DECL_STRUCT_FUNCTION (fndecl) = cfun; |
4541 | cfun->decl = fndecl; | |
70cf5bc1 | 4542 | current_function_funcdef_no = get_next_funcdef_no (); |
5b9db1bc MJ |
4543 | } |
4544 | ||
4545 | invoke_set_current_function_hook (fndecl); | |
db2960f4 | 4546 | |
5b9db1bc MJ |
4547 | if (fndecl != NULL_TREE) |
4548 | { | |
4549 | tree result = DECL_RESULT (fndecl); | |
182e0d71 | 4550 | if (!abstract_p && aggregate_value_p (result, fndecl)) |
db2960f4 | 4551 | { |
3a70d621 | 4552 | #ifdef PCC_STATIC_STRUCT_RETURN |
e3b5732b | 4553 | cfun->returns_pcc_struct = 1; |
3a70d621 | 4554 | #endif |
e3b5732b | 4555 | cfun->returns_struct = 1; |
db2960f4 SL |
4556 | } |
4557 | ||
f38958e8 | 4558 | cfun->stdarg = stdarg_p (fntype); |
b8698a0f | 4559 | |
db2960f4 SL |
4560 | /* Assume all registers in stdarg functions need to be saved. */ |
4561 | cfun->va_list_gpr_size = VA_LIST_MAX_GPR_SIZE; | |
4562 | cfun->va_list_fpr_size = VA_LIST_MAX_FPR_SIZE; | |
8f4f502f EB |
4563 | |
4564 | /* ??? This could be set on a per-function basis by the front-end | |
4565 | but is this worth the hassle? */ | |
4566 | cfun->can_throw_non_call_exceptions = flag_non_call_exceptions; | |
d764963b | 4567 | cfun->can_delete_dead_exceptions = flag_delete_dead_exceptions; |
0b37ba8a AK |
4568 | |
4569 | if (!profile_flag && !flag_instrument_function_entry_exit) | |
4570 | DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (fndecl) = 1; | |
3a70d621 | 4571 | } |
db2960f4 SL |
4572 | } |
4573 | ||
4574 | /* This is like allocate_struct_function, but pushes a new cfun for FNDECL | |
4575 | instead of just setting it. */ | |
9d30f3c1 | 4576 | |
db2960f4 SL |
4577 | void |
4578 | push_struct_function (tree fndecl) | |
4579 | { | |
af16bc76 MJ |
4580 | /* When in_dummy_function we might be in the middle of a pop_cfun and |
4581 | current_function_decl and cfun may not match. */ | |
4582 | gcc_assert (in_dummy_function | |
4583 | || (!cfun && !current_function_decl) | |
4584 | || (cfun && current_function_decl == cfun->decl)); | |
9771b263 | 4585 | cfun_stack.safe_push (cfun); |
af16bc76 | 4586 | current_function_decl = fndecl; |
182e0d71 | 4587 | allocate_struct_function (fndecl, false); |
3a70d621 | 4588 | } |
6f086dfc | 4589 | |
8f4f502f | 4590 | /* Reset crtl and other non-struct-function variables to defaults as |
2067c116 | 4591 | appropriate for emitting rtl at the start of a function. */ |
6f086dfc | 4592 | |
3a70d621 | 4593 | static void |
db2960f4 | 4594 | prepare_function_start (void) |
3a70d621 | 4595 | { |
3e029763 | 4596 | gcc_assert (!crtl->emit.x_last_insn); |
fb0703f7 | 4597 | init_temp_slots (); |
0de456a5 | 4598 | init_emit (); |
bd60bab2 | 4599 | init_varasm_status (); |
0de456a5 | 4600 | init_expr (); |
bf08ebeb | 4601 | default_rtl_profile (); |
6f086dfc | 4602 | |
a11e0df4 | 4603 | if (flag_stack_usage_info) |
d3c12306 | 4604 | { |
766090c2 | 4605 | cfun->su = ggc_cleared_alloc<stack_usage> (); |
d3c12306 EB |
4606 | cfun->su->static_stack_size = -1; |
4607 | } | |
4608 | ||
3a70d621 | 4609 | cse_not_expected = ! optimize; |
6f086dfc | 4610 | |
3a70d621 RH |
4611 | /* Caller save not needed yet. */ |
4612 | caller_save_needed = 0; | |
6f086dfc | 4613 | |
3a70d621 RH |
4614 | /* We haven't done register allocation yet. */ |
4615 | reg_renumber = 0; | |
6f086dfc | 4616 | |
b384405b BS |
4617 | /* Indicate that we have not instantiated virtual registers yet. */ |
4618 | virtuals_instantiated = 0; | |
4619 | ||
1b3d8f8a GK |
4620 | /* Indicate that we want CONCATs now. */ |
4621 | generating_concat_p = 1; | |
4622 | ||
b384405b BS |
4623 | /* Indicate we have no need of a frame pointer yet. */ |
4624 | frame_pointer_needed = 0; | |
b384405b BS |
4625 | } |
4626 | ||
4627 | /* Initialize the rtl expansion mechanism so that we can do simple things | |
4628 | like generate sequences. This is used to provide a context during global | |
db2960f4 SL |
4629 | initialization of some passes. You must call expand_dummy_function_end |
4630 | to exit this context. */ | |
4631 | ||
b384405b | 4632 | void |
fa8db1f7 | 4633 | init_dummy_function_start (void) |
b384405b | 4634 | { |
db2960f4 SL |
4635 | gcc_assert (!in_dummy_function); |
4636 | in_dummy_function = true; | |
4637 | push_struct_function (NULL_TREE); | |
4638 | prepare_function_start (); | |
b384405b BS |
4639 | } |
4640 | ||
4641 | /* Generate RTL for the start of the function SUBR (a FUNCTION_DECL tree node) | |
4642 | and initialize static variables for generating RTL for the statements | |
4643 | of the function. */ | |
4644 | ||
4645 | void | |
fa8db1f7 | 4646 | init_function_start (tree subr) |
b384405b | 4647 | { |
db2960f4 SL |
4648 | if (subr && DECL_STRUCT_FUNCTION (subr)) |
4649 | set_cfun (DECL_STRUCT_FUNCTION (subr)); | |
4650 | else | |
182e0d71 | 4651 | allocate_struct_function (subr, false); |
b9b5f433 JH |
4652 | |
4653 | /* Initialize backend, if needed. */ | |
4654 | initialize_rtl (); | |
4655 | ||
db2960f4 | 4656 | prepare_function_start (); |
2c7eebae | 4657 | decide_function_section (subr); |
b384405b | 4658 | |
6f086dfc RS |
4659 | /* Warn if this value is an aggregate type, |
4660 | regardless of which calling convention we are using for it. */ | |
ccf08a6e DD |
4661 | if (AGGREGATE_TYPE_P (TREE_TYPE (DECL_RESULT (subr)))) |
4662 | warning (OPT_Waggregate_return, "function returns an aggregate"); | |
49ad7cfa | 4663 | } |
5c7675e9 | 4664 | |
7d69de61 RH |
4665 | /* Expand code to verify the stack_protect_guard. This is invoked at |
4666 | the end of a function to be protected. */ | |
4667 | ||
4668 | #ifndef HAVE_stack_protect_test | |
b76be05e JJ |
4669 | # define HAVE_stack_protect_test 0 |
4670 | # define gen_stack_protect_test(x, y, z) (gcc_unreachable (), NULL_RTX) | |
7d69de61 RH |
4671 | #endif |
4672 | ||
b755446c | 4673 | void |
7d69de61 RH |
4674 | stack_protect_epilogue (void) |
4675 | { | |
4676 | tree guard_decl = targetm.stack_protect_guard (); | |
19f8b229 | 4677 | rtx_code_label *label = gen_label_rtx (); |
7d69de61 RH |
4678 | rtx x, y, tmp; |
4679 | ||
08d4cc33 RH |
4680 | x = expand_normal (crtl->stack_protect_guard); |
4681 | y = expand_normal (guard_decl); | |
7d69de61 RH |
4682 | |
4683 | /* Allow the target to compare Y with X without leaking either into | |
4684 | a register. */ | |
fedfecef | 4685 | switch ((int) (HAVE_stack_protect_test != 0)) |
7d69de61 RH |
4686 | { |
4687 | case 1: | |
3aebbe5f | 4688 | tmp = gen_stack_protect_test (x, y, label); |
7d69de61 RH |
4689 | if (tmp) |
4690 | { | |
4691 | emit_insn (tmp); | |
7d69de61 RH |
4692 | break; |
4693 | } | |
4694 | /* FALLTHRU */ | |
4695 | ||
4696 | default: | |
4697 | emit_cmp_and_jump_insns (x, y, EQ, NULL_RTX, ptr_mode, 1, label); | |
4698 | break; | |
4699 | } | |
4700 | ||
4701 | /* The noreturn predictor has been moved to the tree level. The rtl-level | |
4702 | predictors estimate this branch about 20%, which isn't enough to get | |
4703 | things moved out of line. Since this is the only extant case of adding | |
4704 | a noreturn function at the rtl level, it doesn't seem worth doing ought | |
4705 | except adding the prediction by hand. */ | |
4706 | tmp = get_last_insn (); | |
4707 | if (JUMP_P (tmp)) | |
9f215bf5 | 4708 | predict_insn_def (as_a <rtx_insn *> (tmp), PRED_NORETURN, TAKEN); |
7d69de61 | 4709 | |
b3c144a3 SB |
4710 | expand_call (targetm.stack_protect_fail (), NULL_RTX, /*ignore=*/true); |
4711 | free_temp_slots (); | |
7d69de61 RH |
4712 | emit_label (label); |
4713 | } | |
4714 | \f | |
6f086dfc RS |
4715 | /* Start the RTL for a new function, and set variables used for |
4716 | emitting RTL. | |
4717 | SUBR is the FUNCTION_DECL node. | |
4718 | PARMS_HAVE_CLEANUPS is nonzero if there are cleanups associated with | |
4719 | the function's parameters, which must be run at any return statement. */ | |
4720 | ||
4721 | void | |
b79c5284 | 4722 | expand_function_start (tree subr) |
6f086dfc | 4723 | { |
6f086dfc RS |
4724 | /* Make sure volatile mem refs aren't considered |
4725 | valid operands of arithmetic insns. */ | |
4726 | init_recog_no_volatile (); | |
4727 | ||
e3b5732b | 4728 | crtl->profile |
70f4f91c WC |
4729 | = (profile_flag |
4730 | && ! DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (subr)); | |
4731 | ||
e3b5732b | 4732 | crtl->limit_stack |
a157febd GK |
4733 | = (stack_limit_rtx != NULL_RTX && ! DECL_NO_LIMIT_STACK (subr)); |
4734 | ||
52a11cbf RH |
4735 | /* Make the label for return statements to jump to. Do not special |
4736 | case machines with special return instructions -- they will be | |
4737 | handled later during jump, ifcvt, or epilogue creation. */ | |
6f086dfc | 4738 | return_label = gen_label_rtx (); |
6f086dfc RS |
4739 | |
4740 | /* Initialize rtx used to return the value. */ | |
4741 | /* Do this before assign_parms so that we copy the struct value address | |
4742 | before any library calls that assign parms might generate. */ | |
4743 | ||
4744 | /* Decide whether to return the value in memory or in a register. */ | |
61f71b34 | 4745 | if (aggregate_value_p (DECL_RESULT (subr), subr)) |
6f086dfc RS |
4746 | { |
4747 | /* Returning something that won't go in a register. */ | |
b3694847 | 4748 | rtx value_address = 0; |
6f086dfc RS |
4749 | |
4750 | #ifdef PCC_STATIC_STRUCT_RETURN | |
e3b5732b | 4751 | if (cfun->returns_pcc_struct) |
6f086dfc RS |
4752 | { |
4753 | int size = int_size_in_bytes (TREE_TYPE (DECL_RESULT (subr))); | |
4754 | value_address = assemble_static_space (size); | |
4755 | } | |
4756 | else | |
4757 | #endif | |
4758 | { | |
2225b57c | 4759 | rtx sv = targetm.calls.struct_value_rtx (TREE_TYPE (subr), 2); |
6f086dfc RS |
4760 | /* Expect to be passed the address of a place to store the value. |
4761 | If it is passed as an argument, assign_parms will take care of | |
4762 | it. */ | |
61f71b34 | 4763 | if (sv) |
6f086dfc RS |
4764 | { |
4765 | value_address = gen_reg_rtx (Pmode); | |
61f71b34 | 4766 | emit_move_insn (value_address, sv); |
6f086dfc RS |
4767 | } |
4768 | } | |
4769 | if (value_address) | |
ccdecf58 | 4770 | { |
01c98570 JM |
4771 | rtx x = value_address; |
4772 | if (!DECL_BY_REFERENCE (DECL_RESULT (subr))) | |
4773 | { | |
4774 | x = gen_rtx_MEM (DECL_MODE (DECL_RESULT (subr)), x); | |
4775 | set_mem_attributes (x, DECL_RESULT (subr), 1); | |
4776 | } | |
abde42f7 | 4777 | SET_DECL_RTL (DECL_RESULT (subr), x); |
ccdecf58 | 4778 | } |
6f086dfc RS |
4779 | } |
4780 | else if (DECL_MODE (DECL_RESULT (subr)) == VOIDmode) | |
4781 | /* If return mode is void, this decl rtl should not be used. */ | |
19e7881c | 4782 | SET_DECL_RTL (DECL_RESULT (subr), NULL_RTX); |
d5bf1143 | 4783 | else |
a53e14c0 | 4784 | { |
d5bf1143 RH |
4785 | /* Compute the return values into a pseudo reg, which we will copy |
4786 | into the true return register after the cleanups are done. */ | |
bef5d8b6 RS |
4787 | tree return_type = TREE_TYPE (DECL_RESULT (subr)); |
4788 | if (TYPE_MODE (return_type) != BLKmode | |
4789 | && targetm.calls.return_in_msb (return_type)) | |
4790 | /* expand_function_end will insert the appropriate padding in | |
4791 | this case. Use the return value's natural (unpadded) mode | |
4792 | within the function proper. */ | |
4793 | SET_DECL_RTL (DECL_RESULT (subr), | |
4794 | gen_reg_rtx (TYPE_MODE (return_type))); | |
80a480ca | 4795 | else |
0bccc606 | 4796 | { |
bef5d8b6 RS |
4797 | /* In order to figure out what mode to use for the pseudo, we |
4798 | figure out what the mode of the eventual return register will | |
4799 | actually be, and use that. */ | |
1d636cc6 | 4800 | rtx hard_reg = hard_function_value (return_type, subr, 0, 1); |
bef5d8b6 RS |
4801 | |
4802 | /* Structures that are returned in registers are not | |
4803 | aggregate_value_p, so we may see a PARALLEL or a REG. */ | |
4804 | if (REG_P (hard_reg)) | |
4805 | SET_DECL_RTL (DECL_RESULT (subr), | |
4806 | gen_reg_rtx (GET_MODE (hard_reg))); | |
4807 | else | |
4808 | { | |
4809 | gcc_assert (GET_CODE (hard_reg) == PARALLEL); | |
4810 | SET_DECL_RTL (DECL_RESULT (subr), gen_group_rtx (hard_reg)); | |
4811 | } | |
0bccc606 | 4812 | } |
a53e14c0 | 4813 | |
084a1106 JDA |
4814 | /* Set DECL_REGISTER flag so that expand_function_end will copy the |
4815 | result to the real return register(s). */ | |
4816 | DECL_REGISTER (DECL_RESULT (subr)) = 1; | |
a53e14c0 | 4817 | } |
6f086dfc RS |
4818 | |
4819 | /* Initialize rtx for parameters and local variables. | |
4820 | In some cases this requires emitting insns. */ | |
0d1416c6 | 4821 | assign_parms (subr); |
6f086dfc | 4822 | |
6de9cd9a DN |
4823 | /* If function gets a static chain arg, store it. */ |
4824 | if (cfun->static_chain_decl) | |
4825 | { | |
7e140280 | 4826 | tree parm = cfun->static_chain_decl; |
531ca746 | 4827 | rtx local, chain, insn; |
7e140280 | 4828 | |
531ca746 RH |
4829 | local = gen_reg_rtx (Pmode); |
4830 | chain = targetm.calls.static_chain (current_function_decl, true); | |
4831 | ||
4832 | set_decl_incoming_rtl (parm, chain, false); | |
7e140280 | 4833 | SET_DECL_RTL (parm, local); |
7e140280 | 4834 | mark_reg_pointer (local, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (parm)))); |
6de9cd9a | 4835 | |
531ca746 RH |
4836 | insn = emit_move_insn (local, chain); |
4837 | ||
4838 | /* Mark the register as eliminable, similar to parameters. */ | |
4839 | if (MEM_P (chain) | |
4840 | && reg_mentioned_p (arg_pointer_rtx, XEXP (chain, 0))) | |
7543f918 | 4841 | set_dst_reg_note (insn, REG_EQUIV, chain, local); |
3fd48b12 EB |
4842 | |
4843 | /* If we aren't optimizing, save the static chain onto the stack. */ | |
4844 | if (!optimize) | |
4845 | { | |
4846 | tree saved_static_chain_decl | |
4847 | = build_decl (DECL_SOURCE_LOCATION (parm), VAR_DECL, | |
4848 | DECL_NAME (parm), TREE_TYPE (parm)); | |
4849 | rtx saved_static_chain_rtx | |
4850 | = assign_stack_local (Pmode, GET_MODE_SIZE (Pmode), 0); | |
4851 | SET_DECL_RTL (saved_static_chain_decl, saved_static_chain_rtx); | |
4852 | emit_move_insn (saved_static_chain_rtx, chain); | |
4853 | SET_DECL_VALUE_EXPR (parm, saved_static_chain_decl); | |
4854 | DECL_HAS_VALUE_EXPR_P (parm) = 1; | |
4855 | } | |
6de9cd9a DN |
4856 | } |
4857 | ||
4858 | /* If the function receives a non-local goto, then store the | |
4859 | bits we need to restore the frame pointer. */ | |
4860 | if (cfun->nonlocal_goto_save_area) | |
4861 | { | |
4862 | tree t_save; | |
4863 | rtx r_save; | |
4864 | ||
4846b435 | 4865 | tree var = TREE_OPERAND (cfun->nonlocal_goto_save_area, 0); |
ca5f4331 | 4866 | gcc_assert (DECL_RTL_SET_P (var)); |
6de9cd9a | 4867 | |
6bbec3e1 L |
4868 | t_save = build4 (ARRAY_REF, |
4869 | TREE_TYPE (TREE_TYPE (cfun->nonlocal_goto_save_area)), | |
3244e67d RS |
4870 | cfun->nonlocal_goto_save_area, |
4871 | integer_zero_node, NULL_TREE, NULL_TREE); | |
6de9cd9a | 4872 | r_save = expand_expr (t_save, NULL_RTX, VOIDmode, EXPAND_WRITE); |
6bbec3e1 | 4873 | gcc_assert (GET_MODE (r_save) == Pmode); |
f0c51a1e | 4874 | |
88280cf9 | 4875 | emit_move_insn (r_save, targetm.builtin_setjmp_frame_value ()); |
6de9cd9a DN |
4876 | update_nonlocal_goto_save_area (); |
4877 | } | |
f0c51a1e | 4878 | |
6f086dfc RS |
4879 | /* The following was moved from init_function_start. |
4880 | The move is supposed to make sdb output more accurate. */ | |
4881 | /* Indicate the beginning of the function body, | |
4882 | as opposed to parm setup. */ | |
2e040219 | 4883 | emit_note (NOTE_INSN_FUNCTION_BEG); |
6f086dfc | 4884 | |
ede497cf SB |
4885 | gcc_assert (NOTE_P (get_last_insn ())); |
4886 | ||
6f086dfc RS |
4887 | parm_birth_insn = get_last_insn (); |
4888 | ||
e3b5732b | 4889 | if (crtl->profile) |
f6f315fe | 4890 | { |
f6f315fe | 4891 | #ifdef PROFILE_HOOK |
df696a75 | 4892 | PROFILE_HOOK (current_function_funcdef_no); |
411707f4 | 4893 | #endif |
f6f315fe | 4894 | } |
411707f4 | 4895 | |
6d3cc8f0 EB |
4896 | /* If we are doing generic stack checking, the probe should go here. */ |
4897 | if (flag_stack_check == GENERIC_STACK_CHECK) | |
ede497cf | 4898 | stack_check_probe_note = emit_note (NOTE_INSN_DELETED); |
6f086dfc RS |
4899 | } |
4900 | \f | |
49ad7cfa BS |
4901 | /* Undo the effects of init_dummy_function_start. */ |
4902 | void | |
fa8db1f7 | 4903 | expand_dummy_function_end (void) |
49ad7cfa | 4904 | { |
db2960f4 SL |
4905 | gcc_assert (in_dummy_function); |
4906 | ||
49ad7cfa BS |
4907 | /* End any sequences that failed to be closed due to syntax errors. */ |
4908 | while (in_sequence_p ()) | |
4909 | end_sequence (); | |
4910 | ||
4911 | /* Outside function body, can't compute type's actual size | |
4912 | until next function's body starts. */ | |
fa51b01b | 4913 | |
01d939e8 BS |
4914 | free_after_parsing (cfun); |
4915 | free_after_compilation (cfun); | |
db2960f4 SL |
4916 | pop_cfun (); |
4917 | in_dummy_function = false; | |
49ad7cfa BS |
4918 | } |
4919 | ||
c13fde05 RH |
4920 | /* Call DOIT for each hard register used as a return value from |
4921 | the current function. */ | |
bd695e1e RH |
4922 | |
4923 | void | |
fa8db1f7 | 4924 | diddle_return_value (void (*doit) (rtx, void *), void *arg) |
bd695e1e | 4925 | { |
38173d38 | 4926 | rtx outgoing = crtl->return_rtx; |
c13fde05 RH |
4927 | |
4928 | if (! outgoing) | |
4929 | return; | |
bd695e1e | 4930 | |
f8cfc6aa | 4931 | if (REG_P (outgoing)) |
c13fde05 RH |
4932 | (*doit) (outgoing, arg); |
4933 | else if (GET_CODE (outgoing) == PARALLEL) | |
4934 | { | |
4935 | int i; | |
bd695e1e | 4936 | |
c13fde05 RH |
4937 | for (i = 0; i < XVECLEN (outgoing, 0); i++) |
4938 | { | |
4939 | rtx x = XEXP (XVECEXP (outgoing, 0, i), 0); | |
4940 | ||
f8cfc6aa | 4941 | if (REG_P (x) && REGNO (x) < FIRST_PSEUDO_REGISTER) |
c13fde05 | 4942 | (*doit) (x, arg); |
bd695e1e RH |
4943 | } |
4944 | } | |
4945 | } | |
4946 | ||
c13fde05 | 4947 | static void |
fa8db1f7 | 4948 | do_clobber_return_reg (rtx reg, void *arg ATTRIBUTE_UNUSED) |
c13fde05 | 4949 | { |
c41c1387 | 4950 | emit_clobber (reg); |
c13fde05 RH |
4951 | } |
4952 | ||
4953 | void | |
fa8db1f7 | 4954 | clobber_return_register (void) |
c13fde05 RH |
4955 | { |
4956 | diddle_return_value (do_clobber_return_reg, NULL); | |
9c65bbf4 JH |
4957 | |
4958 | /* In case we do use pseudo to return value, clobber it too. */ | |
4959 | if (DECL_RTL_SET_P (DECL_RESULT (current_function_decl))) | |
4960 | { | |
4961 | tree decl_result = DECL_RESULT (current_function_decl); | |
4962 | rtx decl_rtl = DECL_RTL (decl_result); | |
4963 | if (REG_P (decl_rtl) && REGNO (decl_rtl) >= FIRST_PSEUDO_REGISTER) | |
4964 | { | |
4965 | do_clobber_return_reg (decl_rtl, NULL); | |
4966 | } | |
4967 | } | |
c13fde05 RH |
4968 | } |
4969 | ||
4970 | static void | |
fa8db1f7 | 4971 | do_use_return_reg (rtx reg, void *arg ATTRIBUTE_UNUSED) |
c13fde05 | 4972 | { |
c41c1387 | 4973 | emit_use (reg); |
c13fde05 RH |
4974 | } |
4975 | ||
0bf8477d | 4976 | static void |
fa8db1f7 | 4977 | use_return_register (void) |
c13fde05 RH |
4978 | { |
4979 | diddle_return_value (do_use_return_reg, NULL); | |
4980 | } | |
4981 | ||
902edd36 JH |
4982 | /* Possibly warn about unused parameters. */ |
4983 | void | |
4984 | do_warn_unused_parameter (tree fn) | |
4985 | { | |
4986 | tree decl; | |
4987 | ||
4988 | for (decl = DECL_ARGUMENTS (fn); | |
910ad8de | 4989 | decl; decl = DECL_CHAIN (decl)) |
902edd36 | 4990 | if (!TREE_USED (decl) && TREE_CODE (decl) == PARM_DECL |
534fd534 DF |
4991 | && DECL_NAME (decl) && !DECL_ARTIFICIAL (decl) |
4992 | && !TREE_NO_WARNING (decl)) | |
b9b8dde3 | 4993 | warning (OPT_Wunused_parameter, "unused parameter %q+D", decl); |
902edd36 JH |
4994 | } |
4995 | ||
862d0b35 DN |
4996 | /* Set the location of the insn chain starting at INSN to LOC. */ |
4997 | ||
4998 | static void | |
dc01c3d1 | 4999 | set_insn_locations (rtx_insn *insn, int loc) |
862d0b35 | 5000 | { |
dc01c3d1 | 5001 | while (insn != NULL) |
862d0b35 DN |
5002 | { |
5003 | if (INSN_P (insn)) | |
5004 | INSN_LOCATION (insn) = loc; | |
5005 | insn = NEXT_INSN (insn); | |
5006 | } | |
5007 | } | |
5008 | ||
71c0e7fc | 5009 | /* Generate RTL for the end of the current function. */ |
6f086dfc RS |
5010 | |
5011 | void | |
fa8db1f7 | 5012 | expand_function_end (void) |
6f086dfc | 5013 | { |
932f0847 | 5014 | rtx clobber_after; |
6f086dfc | 5015 | |
964be02f RH |
5016 | /* If arg_pointer_save_area was referenced only from a nested |
5017 | function, we will not have initialized it yet. Do that now. */ | |
e3b5732b | 5018 | if (arg_pointer_save_area && ! crtl->arg_pointer_save_area_init) |
bd60bab2 | 5019 | get_arg_pointer_save_area (); |
964be02f | 5020 | |
b38f3813 | 5021 | /* If we are doing generic stack checking and this function makes calls, |
11044f66 RK |
5022 | do a stack probe at the start of the function to ensure we have enough |
5023 | space for another stack frame. */ | |
b38f3813 | 5024 | if (flag_stack_check == GENERIC_STACK_CHECK) |
11044f66 | 5025 | { |
691fe203 | 5026 | rtx_insn *insn, *seq; |
11044f66 RK |
5027 | |
5028 | for (insn = get_insns (); insn; insn = NEXT_INSN (insn)) | |
4b4bf941 | 5029 | if (CALL_P (insn)) |
11044f66 | 5030 | { |
c35af30f | 5031 | rtx max_frame_size = GEN_INT (STACK_CHECK_MAX_FRAME_SIZE); |
11044f66 | 5032 | start_sequence (); |
c35af30f EB |
5033 | if (STACK_CHECK_MOVING_SP) |
5034 | anti_adjust_stack_and_probe (max_frame_size, true); | |
5035 | else | |
5036 | probe_stack_range (STACK_OLD_CHECK_PROTECT, max_frame_size); | |
11044f66 RK |
5037 | seq = get_insns (); |
5038 | end_sequence (); | |
5368224f | 5039 | set_insn_locations (seq, prologue_location); |
ede497cf | 5040 | emit_insn_before (seq, stack_check_probe_note); |
11044f66 RK |
5041 | break; |
5042 | } | |
5043 | } | |
5044 | ||
6f086dfc RS |
5045 | /* End any sequences that failed to be closed due to syntax errors. */ |
5046 | while (in_sequence_p ()) | |
5f4f0e22 | 5047 | end_sequence (); |
6f086dfc | 5048 | |
6f086dfc RS |
5049 | clear_pending_stack_adjust (); |
5050 | do_pending_stack_adjust (); | |
5051 | ||
6f086dfc RS |
5052 | /* Output a linenumber for the end of the function. |
5053 | SDB depends on this. */ | |
5368224f | 5054 | set_curr_insn_location (input_location); |
6f086dfc | 5055 | |
fbffc70a | 5056 | /* Before the return label (if any), clobber the return |
a1f300c0 | 5057 | registers so that they are not propagated live to the rest of |
fbffc70a GK |
5058 | the function. This can only happen with functions that drop |
5059 | through; if there had been a return statement, there would | |
932f0847 JH |
5060 | have either been a return rtx, or a jump to the return label. |
5061 | ||
5062 | We delay actual code generation after the current_function_value_rtx | |
5063 | is computed. */ | |
5064 | clobber_after = get_last_insn (); | |
fbffc70a | 5065 | |
526c334b KH |
5066 | /* Output the label for the actual return from the function. */ |
5067 | emit_label (return_label); | |
6f086dfc | 5068 | |
677f3fa8 | 5069 | if (targetm_common.except_unwind_info (&global_options) == UI_SJLJ) |
815eb8f0 AM |
5070 | { |
5071 | /* Let except.c know where it should emit the call to unregister | |
5072 | the function context for sjlj exceptions. */ | |
5073 | if (flag_exceptions) | |
5074 | sjlj_emit_function_exit_after (get_last_insn ()); | |
5075 | } | |
6fb5fa3c DB |
5076 | else |
5077 | { | |
5078 | /* We want to ensure that instructions that may trap are not | |
5079 | moved into the epilogue by scheduling, because we don't | |
5080 | always emit unwind information for the epilogue. */ | |
8f4f502f | 5081 | if (cfun->can_throw_non_call_exceptions) |
6fb5fa3c DB |
5082 | emit_insn (gen_blockage ()); |
5083 | } | |
0b59e81e | 5084 | |
652b0932 RH |
5085 | /* If this is an implementation of throw, do what's necessary to |
5086 | communicate between __builtin_eh_return and the epilogue. */ | |
5087 | expand_eh_return (); | |
5088 | ||
3e4eac3f RH |
5089 | /* If scalar return value was computed in a pseudo-reg, or was a named |
5090 | return value that got dumped to the stack, copy that to the hard | |
5091 | return register. */ | |
19e7881c | 5092 | if (DECL_RTL_SET_P (DECL_RESULT (current_function_decl))) |
6f086dfc | 5093 | { |
3e4eac3f RH |
5094 | tree decl_result = DECL_RESULT (current_function_decl); |
5095 | rtx decl_rtl = DECL_RTL (decl_result); | |
5096 | ||
5097 | if (REG_P (decl_rtl) | |
5098 | ? REGNO (decl_rtl) >= FIRST_PSEUDO_REGISTER | |
5099 | : DECL_REGISTER (decl_result)) | |
5100 | { | |
38173d38 | 5101 | rtx real_decl_rtl = crtl->return_rtx; |
6f086dfc | 5102 | |
ce5e43d0 | 5103 | /* This should be set in assign_parms. */ |
0bccc606 | 5104 | gcc_assert (REG_FUNCTION_VALUE_P (real_decl_rtl)); |
3e4eac3f RH |
5105 | |
5106 | /* If this is a BLKmode structure being returned in registers, | |
5107 | then use the mode computed in expand_return. Note that if | |
797a6ac1 | 5108 | decl_rtl is memory, then its mode may have been changed, |
38173d38 | 5109 | but that crtl->return_rtx has not. */ |
3e4eac3f | 5110 | if (GET_MODE (real_decl_rtl) == BLKmode) |
ce5e43d0 | 5111 | PUT_MODE (real_decl_rtl, GET_MODE (decl_rtl)); |
3e4eac3f | 5112 | |
bef5d8b6 RS |
5113 | /* If a non-BLKmode return value should be padded at the least |
5114 | significant end of the register, shift it left by the appropriate | |
5115 | amount. BLKmode results are handled using the group load/store | |
5116 | machinery. */ | |
5117 | if (TYPE_MODE (TREE_TYPE (decl_result)) != BLKmode | |
66de4d7c | 5118 | && REG_P (real_decl_rtl) |
bef5d8b6 RS |
5119 | && targetm.calls.return_in_msb (TREE_TYPE (decl_result))) |
5120 | { | |
5121 | emit_move_insn (gen_rtx_REG (GET_MODE (decl_rtl), | |
5122 | REGNO (real_decl_rtl)), | |
5123 | decl_rtl); | |
5124 | shift_return_value (GET_MODE (decl_rtl), true, real_decl_rtl); | |
5125 | } | |
3e4eac3f | 5126 | /* If a named return value dumped decl_return to memory, then |
797a6ac1 | 5127 | we may need to re-do the PROMOTE_MODE signed/unsigned |
3e4eac3f | 5128 | extension. */ |
bef5d8b6 | 5129 | else if (GET_MODE (real_decl_rtl) != GET_MODE (decl_rtl)) |
3e4eac3f | 5130 | { |
8df83eae | 5131 | int unsignedp = TYPE_UNSIGNED (TREE_TYPE (decl_result)); |
cde0f3fd PB |
5132 | promote_function_mode (TREE_TYPE (decl_result), |
5133 | GET_MODE (decl_rtl), &unsignedp, | |
5134 | TREE_TYPE (current_function_decl), 1); | |
3e4eac3f RH |
5135 | |
5136 | convert_move (real_decl_rtl, decl_rtl, unsignedp); | |
5137 | } | |
aa570f54 | 5138 | else if (GET_CODE (real_decl_rtl) == PARALLEL) |
084a1106 JDA |
5139 | { |
5140 | /* If expand_function_start has created a PARALLEL for decl_rtl, | |
5141 | move the result to the real return registers. Otherwise, do | |
5142 | a group load from decl_rtl for a named return. */ | |
5143 | if (GET_CODE (decl_rtl) == PARALLEL) | |
5144 | emit_group_move (real_decl_rtl, decl_rtl); | |
5145 | else | |
5146 | emit_group_load (real_decl_rtl, decl_rtl, | |
6e985040 | 5147 | TREE_TYPE (decl_result), |
084a1106 JDA |
5148 | int_size_in_bytes (TREE_TYPE (decl_result))); |
5149 | } | |
652b0932 RH |
5150 | /* In the case of complex integer modes smaller than a word, we'll |
5151 | need to generate some non-trivial bitfield insertions. Do that | |
5152 | on a pseudo and not the hard register. */ | |
5153 | else if (GET_CODE (decl_rtl) == CONCAT | |
5154 | && GET_MODE_CLASS (GET_MODE (decl_rtl)) == MODE_COMPLEX_INT | |
5155 | && GET_MODE_BITSIZE (GET_MODE (decl_rtl)) <= BITS_PER_WORD) | |
5156 | { | |
5157 | int old_generating_concat_p; | |
5158 | rtx tmp; | |
5159 | ||
5160 | old_generating_concat_p = generating_concat_p; | |
5161 | generating_concat_p = 0; | |
5162 | tmp = gen_reg_rtx (GET_MODE (decl_rtl)); | |
5163 | generating_concat_p = old_generating_concat_p; | |
5164 | ||
5165 | emit_move_insn (tmp, decl_rtl); | |
5166 | emit_move_insn (real_decl_rtl, tmp); | |
5167 | } | |
3e4eac3f RH |
5168 | else |
5169 | emit_move_insn (real_decl_rtl, decl_rtl); | |
3e4eac3f | 5170 | } |
6f086dfc RS |
5171 | } |
5172 | ||
5173 | /* If returning a structure, arrange to return the address of the value | |
5174 | in a place where debuggers expect to find it. | |
5175 | ||
5176 | If returning a structure PCC style, | |
5177 | the caller also depends on this value. | |
e3b5732b JH |
5178 | And cfun->returns_pcc_struct is not necessarily set. */ |
5179 | if (cfun->returns_struct | |
5180 | || cfun->returns_pcc_struct) | |
6f086dfc | 5181 | { |
cc77ae10 | 5182 | rtx value_address = DECL_RTL (DECL_RESULT (current_function_decl)); |
6f086dfc | 5183 | tree type = TREE_TYPE (DECL_RESULT (current_function_decl)); |
cc77ae10 JM |
5184 | rtx outgoing; |
5185 | ||
5186 | if (DECL_BY_REFERENCE (DECL_RESULT (current_function_decl))) | |
5187 | type = TREE_TYPE (type); | |
5188 | else | |
5189 | value_address = XEXP (value_address, 0); | |
5190 | ||
1d636cc6 RG |
5191 | outgoing = targetm.calls.function_value (build_pointer_type (type), |
5192 | current_function_decl, true); | |
6f086dfc RS |
5193 | |
5194 | /* Mark this as a function return value so integrate will delete the | |
5195 | assignment and USE below when inlining this function. */ | |
5196 | REG_FUNCTION_VALUE_P (outgoing) = 1; | |
5197 | ||
d1608933 | 5198 | /* The address may be ptr_mode and OUTGOING may be Pmode. */ |
5ae6cd0d MM |
5199 | value_address = convert_memory_address (GET_MODE (outgoing), |
5200 | value_address); | |
d1608933 | 5201 | |
6f086dfc | 5202 | emit_move_insn (outgoing, value_address); |
d1608933 RK |
5203 | |
5204 | /* Show return register used to hold result (in this case the address | |
5205 | of the result. */ | |
38173d38 | 5206 | crtl->return_rtx = outgoing; |
6f086dfc RS |
5207 | } |
5208 | ||
79c7fda6 JJ |
5209 | /* Emit the actual code to clobber return register. Don't emit |
5210 | it if clobber_after is a barrier, then the previous basic block | |
5211 | certainly doesn't fall thru into the exit block. */ | |
5212 | if (!BARRIER_P (clobber_after)) | |
5213 | { | |
5214 | rtx seq; | |
797a6ac1 | 5215 | |
79c7fda6 JJ |
5216 | start_sequence (); |
5217 | clobber_return_register (); | |
5218 | seq = get_insns (); | |
5219 | end_sequence (); | |
932f0847 | 5220 | |
79c7fda6 JJ |
5221 | emit_insn_after (seq, clobber_after); |
5222 | } | |
932f0847 | 5223 | |
609c3937 | 5224 | /* Output the label for the naked return from the function. */ |
4c33221c UW |
5225 | if (naked_return_label) |
5226 | emit_label (naked_return_label); | |
6e3077c6 | 5227 | |
25108646 AH |
5228 | /* @@@ This is a kludge. We want to ensure that instructions that |
5229 | may trap are not moved into the epilogue by scheduling, because | |
56d17681 | 5230 | we don't always emit unwind information for the epilogue. */ |
f0a0390e | 5231 | if (cfun->can_throw_non_call_exceptions |
677f3fa8 | 5232 | && targetm_common.except_unwind_info (&global_options) != UI_SJLJ) |
56d17681 | 5233 | emit_insn (gen_blockage ()); |
25108646 | 5234 | |
7d69de61 | 5235 | /* If stack protection is enabled for this function, check the guard. */ |
cb91fab0 | 5236 | if (crtl->stack_protect_guard) |
7d69de61 RH |
5237 | stack_protect_epilogue (); |
5238 | ||
40184445 BS |
5239 | /* If we had calls to alloca, and this machine needs |
5240 | an accurate stack pointer to exit the function, | |
5241 | insert some code to save and restore the stack pointer. */ | |
5242 | if (! EXIT_IGNORE_STACK | |
e3b5732b | 5243 | && cfun->calls_alloca) |
40184445 | 5244 | { |
9eac0f2a | 5245 | rtx tem = 0, seq; |
40184445 | 5246 | |
9eac0f2a RH |
5247 | start_sequence (); |
5248 | emit_stack_save (SAVE_FUNCTION, &tem); | |
5249 | seq = get_insns (); | |
5250 | end_sequence (); | |
5251 | emit_insn_before (seq, parm_birth_insn); | |
5252 | ||
5253 | emit_stack_restore (SAVE_FUNCTION, tem); | |
40184445 BS |
5254 | } |
5255 | ||
c13fde05 RH |
5256 | /* ??? This should no longer be necessary since stupid is no longer with |
5257 | us, but there are some parts of the compiler (eg reload_combine, and | |
5258 | sh mach_dep_reorg) that still try and compute their own lifetime info | |
5259 | instead of using the general framework. */ | |
5260 | use_return_register (); | |
6f086dfc | 5261 | } |
278ed218 RH |
5262 | |
5263 | rtx | |
bd60bab2 | 5264 | get_arg_pointer_save_area (void) |
278ed218 | 5265 | { |
bd60bab2 | 5266 | rtx ret = arg_pointer_save_area; |
278ed218 RH |
5267 | |
5268 | if (! ret) | |
5269 | { | |
bd60bab2 JH |
5270 | ret = assign_stack_local (Pmode, GET_MODE_SIZE (Pmode), 0); |
5271 | arg_pointer_save_area = ret; | |
964be02f RH |
5272 | } |
5273 | ||
e3b5732b | 5274 | if (! crtl->arg_pointer_save_area_init) |
964be02f RH |
5275 | { |
5276 | rtx seq; | |
278ed218 | 5277 | |
797a6ac1 | 5278 | /* Save the arg pointer at the beginning of the function. The |
964be02f | 5279 | generated stack slot may not be a valid memory address, so we |
278ed218 RH |
5280 | have to check it and fix it if necessary. */ |
5281 | start_sequence (); | |
1a8cb155 | 5282 | emit_move_insn (validize_mem (copy_rtx (ret)), |
2e3f842f | 5283 | crtl->args.internal_arg_pointer); |
2f937369 | 5284 | seq = get_insns (); |
278ed218 RH |
5285 | end_sequence (); |
5286 | ||
964be02f | 5287 | push_topmost_sequence (); |
1cb2fc7b | 5288 | emit_insn_after (seq, entry_of_function ()); |
964be02f | 5289 | pop_topmost_sequence (); |
c1d9a70a ILT |
5290 | |
5291 | crtl->arg_pointer_save_area_init = true; | |
278ed218 RH |
5292 | } |
5293 | ||
5294 | return ret; | |
5295 | } | |
bdac5f58 | 5296 | \f |
cd9c1ca8 RH |
5297 | /* Add a list of INSNS to the hash HASHP, possibly allocating HASHP |
5298 | for the first time. */ | |
bdac5f58 | 5299 | |
0a1c58a2 | 5300 | static void |
dc01c3d1 | 5301 | record_insns (rtx_insn *insns, rtx end, htab_t *hashp) |
bdac5f58 | 5302 | { |
dc01c3d1 | 5303 | rtx_insn *tmp; |
cd9c1ca8 | 5304 | htab_t hash = *hashp; |
0a1c58a2 | 5305 | |
cd9c1ca8 RH |
5306 | if (hash == NULL) |
5307 | *hashp = hash | |
5308 | = htab_create_ggc (17, htab_hash_pointer, htab_eq_pointer, NULL); | |
5309 | ||
5310 | for (tmp = insns; tmp != end; tmp = NEXT_INSN (tmp)) | |
5311 | { | |
5312 | void **slot = htab_find_slot (hash, tmp, INSERT); | |
5313 | gcc_assert (*slot == NULL); | |
5314 | *slot = tmp; | |
5315 | } | |
5316 | } | |
5317 | ||
cd400280 RH |
5318 | /* INSN has been duplicated or replaced by as COPY, perhaps by duplicating a |
5319 | basic block, splitting or peepholes. If INSN is a prologue or epilogue | |
5320 | insn, then record COPY as well. */ | |
cd9c1ca8 RH |
5321 | |
5322 | void | |
cd400280 | 5323 | maybe_copy_prologue_epilogue_insn (rtx insn, rtx copy) |
cd9c1ca8 | 5324 | { |
cd400280 | 5325 | htab_t hash; |
cd9c1ca8 RH |
5326 | void **slot; |
5327 | ||
cd400280 RH |
5328 | hash = epilogue_insn_hash; |
5329 | if (!hash || !htab_find (hash, insn)) | |
5330 | { | |
5331 | hash = prologue_insn_hash; | |
5332 | if (!hash || !htab_find (hash, insn)) | |
5333 | return; | |
5334 | } | |
cd9c1ca8 | 5335 | |
cd400280 | 5336 | slot = htab_find_slot (hash, copy, INSERT); |
cd9c1ca8 RH |
5337 | gcc_assert (*slot == NULL); |
5338 | *slot = copy; | |
bdac5f58 TW |
5339 | } |
5340 | ||
cd9c1ca8 RH |
5341 | /* Determine if any INSNs in HASH are, or are part of, INSN. Because |
5342 | we can be running after reorg, SEQUENCE rtl is possible. */ | |
bdac5f58 | 5343 | |
cd9c1ca8 RH |
5344 | static bool |
5345 | contains (const_rtx insn, htab_t hash) | |
bdac5f58 | 5346 | { |
cd9c1ca8 RH |
5347 | if (hash == NULL) |
5348 | return false; | |
bdac5f58 | 5349 | |
cd9c1ca8 | 5350 | if (NONJUMP_INSN_P (insn) && GET_CODE (PATTERN (insn)) == SEQUENCE) |
bdac5f58 | 5351 | { |
e0944870 | 5352 | rtx_sequence *seq = as_a <rtx_sequence *> (PATTERN (insn)); |
cd9c1ca8 | 5353 | int i; |
e0944870 DM |
5354 | for (i = seq->len () - 1; i >= 0; i--) |
5355 | if (htab_find (hash, seq->element (i))) | |
cd9c1ca8 RH |
5356 | return true; |
5357 | return false; | |
bdac5f58 | 5358 | } |
cd9c1ca8 RH |
5359 | |
5360 | return htab_find (hash, insn) != NULL; | |
bdac5f58 | 5361 | } |
5c7675e9 RH |
5362 | |
5363 | int | |
4f588890 | 5364 | prologue_epilogue_contains (const_rtx insn) |
5c7675e9 | 5365 | { |
cd9c1ca8 | 5366 | if (contains (insn, prologue_insn_hash)) |
5c7675e9 | 5367 | return 1; |
cd9c1ca8 | 5368 | if (contains (insn, epilogue_insn_hash)) |
5c7675e9 RH |
5369 | return 1; |
5370 | return 0; | |
5371 | } | |
bdac5f58 | 5372 | |
170d8157 | 5373 | #ifdef HAVE_return |
4c029f40 TV |
5374 | /* Insert use of return register before the end of BB. */ |
5375 | ||
5376 | static void | |
5377 | emit_use_return_register_into_block (basic_block bb) | |
5378 | { | |
1e1b18c1 | 5379 | rtx seq, insn; |
4c029f40 TV |
5380 | start_sequence (); |
5381 | use_return_register (); | |
5382 | seq = get_insns (); | |
5383 | end_sequence (); | |
1e1b18c1 EB |
5384 | insn = BB_END (bb); |
5385 | #ifdef HAVE_cc0 | |
5386 | if (reg_mentioned_p (cc0_rtx, PATTERN (insn))) | |
5387 | insn = prev_cc0_setter (insn); | |
5388 | #endif | |
5389 | emit_insn_before (seq, insn); | |
4c029f40 TV |
5390 | } |
5391 | ||
484db665 BS |
5392 | |
5393 | /* Create a return pattern, either simple_return or return, depending on | |
5394 | simple_p. */ | |
5395 | ||
5396 | static rtx | |
5397 | gen_return_pattern (bool simple_p) | |
5398 | { | |
5399 | #ifdef HAVE_simple_return | |
5400 | return simple_p ? gen_simple_return () : gen_return (); | |
5401 | #else | |
5402 | gcc_assert (!simple_p); | |
5403 | return gen_return (); | |
5404 | #endif | |
5405 | } | |
5406 | ||
5407 | /* Insert an appropriate return pattern at the end of block BB. This | |
5408 | also means updating block_for_insn appropriately. SIMPLE_P is | |
5409 | the same as in gen_return_pattern and passed to it. */ | |
69732dcb | 5410 | |
f30e25a3 | 5411 | void |
484db665 | 5412 | emit_return_into_block (bool simple_p, basic_block bb) |
69732dcb | 5413 | { |
484db665 BS |
5414 | rtx jump, pat; |
5415 | jump = emit_jump_insn_after (gen_return_pattern (simple_p), BB_END (bb)); | |
5416 | pat = PATTERN (jump); | |
26898771 BS |
5417 | if (GET_CODE (pat) == PARALLEL) |
5418 | pat = XVECEXP (pat, 0, 0); | |
5419 | gcc_assert (ANY_RETURN_P (pat)); | |
5420 | JUMP_LABEL (jump) = pat; | |
69732dcb | 5421 | } |
484db665 | 5422 | #endif |
69732dcb | 5423 | |
387748de AM |
5424 | /* Set JUMP_LABEL for a return insn. */ |
5425 | ||
5426 | void | |
5427 | set_return_jump_label (rtx returnjump) | |
5428 | { | |
5429 | rtx pat = PATTERN (returnjump); | |
5430 | if (GET_CODE (pat) == PARALLEL) | |
5431 | pat = XVECEXP (pat, 0, 0); | |
5432 | if (ANY_RETURN_P (pat)) | |
5433 | JUMP_LABEL (returnjump) = pat; | |
5434 | else | |
5435 | JUMP_LABEL (returnjump) = ret_rtx; | |
5436 | } | |
5437 | ||
ffe14686 AM |
5438 | #if defined (HAVE_return) || defined (HAVE_simple_return) |
5439 | /* Return true if there are any active insns between HEAD and TAIL. */ | |
f30e25a3 | 5440 | bool |
ffd80b43 | 5441 | active_insn_between (rtx_insn *head, rtx_insn *tail) |
39d52ae5 | 5442 | { |
ffe14686 AM |
5443 | while (tail) |
5444 | { | |
5445 | if (active_insn_p (tail)) | |
5446 | return true; | |
5447 | if (tail == head) | |
5448 | return false; | |
5449 | tail = PREV_INSN (tail); | |
5450 | } | |
5451 | return false; | |
5452 | } | |
5453 | ||
5454 | /* LAST_BB is a block that exits, and empty of active instructions. | |
5455 | Examine its predecessors for jumps that can be converted to | |
5456 | (conditional) returns. */ | |
f30e25a3 | 5457 | vec<edge> |
ffe14686 | 5458 | convert_jumps_to_returns (basic_block last_bb, bool simple_p, |
9771b263 | 5459 | vec<edge> unconverted ATTRIBUTE_UNUSED) |
ffe14686 AM |
5460 | { |
5461 | int i; | |
5462 | basic_block bb; | |
39d52ae5 | 5463 | rtx label; |
ffe14686 AM |
5464 | edge_iterator ei; |
5465 | edge e; | |
ef062b13 | 5466 | auto_vec<basic_block> src_bbs (EDGE_COUNT (last_bb->preds)); |
39d52ae5 | 5467 | |
ffe14686 | 5468 | FOR_EACH_EDGE (e, ei, last_bb->preds) |
fefa31b5 | 5469 | if (e->src != ENTRY_BLOCK_PTR_FOR_FN (cfun)) |
9771b263 | 5470 | src_bbs.quick_push (e->src); |
ffe14686 AM |
5471 | |
5472 | label = BB_HEAD (last_bb); | |
5473 | ||
9771b263 | 5474 | FOR_EACH_VEC_ELT (src_bbs, i, bb) |
39d52ae5 | 5475 | { |
68a1a6c0 | 5476 | rtx_insn *jump = BB_END (bb); |
ffe14686 AM |
5477 | |
5478 | if (!JUMP_P (jump) || JUMP_LABEL (jump) != label) | |
5479 | continue; | |
5480 | ||
5481 | e = find_edge (bb, last_bb); | |
5482 | ||
5483 | /* If we have an unconditional jump, we can replace that | |
5484 | with a simple return instruction. */ | |
5485 | if (simplejump_p (jump)) | |
5486 | { | |
5487 | /* The use of the return register might be present in the exit | |
5488 | fallthru block. Either: | |
5489 | - removing the use is safe, and we should remove the use in | |
5490 | the exit fallthru block, or | |
5491 | - removing the use is not safe, and we should add it here. | |
5492 | For now, we conservatively choose the latter. Either of the | |
5493 | 2 helps in crossjumping. */ | |
5494 | emit_use_return_register_into_block (bb); | |
5495 | ||
5496 | emit_return_into_block (simple_p, bb); | |
5497 | delete_insn (jump); | |
5498 | } | |
5499 | ||
5500 | /* If we have a conditional jump branching to the last | |
5501 | block, we can try to replace that with a conditional | |
5502 | return instruction. */ | |
5503 | else if (condjump_p (jump)) | |
5504 | { | |
5505 | rtx dest; | |
5506 | ||
5507 | if (simple_p) | |
5508 | dest = simple_return_rtx; | |
5509 | else | |
5510 | dest = ret_rtx; | |
5511 | if (!redirect_jump (jump, dest, 0)) | |
5512 | { | |
5513 | #ifdef HAVE_simple_return | |
5514 | if (simple_p) | |
5515 | { | |
5516 | if (dump_file) | |
5517 | fprintf (dump_file, | |
5518 | "Failed to redirect bb %d branch.\n", bb->index); | |
9771b263 | 5519 | unconverted.safe_push (e); |
ffe14686 AM |
5520 | } |
5521 | #endif | |
5522 | continue; | |
5523 | } | |
5524 | ||
5525 | /* See comment in simplejump_p case above. */ | |
5526 | emit_use_return_register_into_block (bb); | |
5527 | ||
5528 | /* If this block has only one successor, it both jumps | |
5529 | and falls through to the fallthru block, so we can't | |
5530 | delete the edge. */ | |
5531 | if (single_succ_p (bb)) | |
5532 | continue; | |
5533 | } | |
5534 | else | |
5535 | { | |
5536 | #ifdef HAVE_simple_return | |
5537 | if (simple_p) | |
5538 | { | |
5539 | if (dump_file) | |
5540 | fprintf (dump_file, | |
5541 | "Failed to redirect bb %d branch.\n", bb->index); | |
9771b263 | 5542 | unconverted.safe_push (e); |
ffe14686 AM |
5543 | } |
5544 | #endif | |
5545 | continue; | |
5546 | } | |
5547 | ||
5548 | /* Fix up the CFG for the successful change we just made. */ | |
fefa31b5 | 5549 | redirect_edge_succ (e, EXIT_BLOCK_PTR_FOR_FN (cfun)); |
d3b623c7 | 5550 | e->flags &= ~EDGE_CROSSING; |
39d52ae5 | 5551 | } |
9771b263 | 5552 | src_bbs.release (); |
ffe14686 | 5553 | return unconverted; |
39d52ae5 BS |
5554 | } |
5555 | ||
ffe14686 | 5556 | /* Emit a return insn for the exit fallthru block. */ |
f30e25a3 | 5557 | basic_block |
ffe14686 AM |
5558 | emit_return_for_exit (edge exit_fallthru_edge, bool simple_p) |
5559 | { | |
5560 | basic_block last_bb = exit_fallthru_edge->src; | |
5561 | ||
5562 | if (JUMP_P (BB_END (last_bb))) | |
5563 | { | |
5564 | last_bb = split_edge (exit_fallthru_edge); | |
5565 | exit_fallthru_edge = single_succ_edge (last_bb); | |
5566 | } | |
5567 | emit_barrier_after (BB_END (last_bb)); | |
5568 | emit_return_into_block (simple_p, last_bb); | |
5569 | exit_fallthru_edge->flags &= ~EDGE_FALLTHRU; | |
5570 | return last_bb; | |
5571 | } | |
5572 | #endif | |
5573 | ||
5574 | ||
9faa82d8 | 5575 | /* Generate the prologue and epilogue RTL if the machine supports it. Thread |
bdac5f58 | 5576 | this into place with notes indicating where the prologue ends and where |
484db665 BS |
5577 | the epilogue begins. Update the basic block information when possible. |
5578 | ||
5579 | Notes on epilogue placement: | |
5580 | There are several kinds of edges to the exit block: | |
5581 | * a single fallthru edge from LAST_BB | |
5582 | * possibly, edges from blocks containing sibcalls | |
5583 | * possibly, fake edges from infinite loops | |
5584 | ||
5585 | The epilogue is always emitted on the fallthru edge from the last basic | |
5586 | block in the function, LAST_BB, into the exit block. | |
5587 | ||
5588 | If LAST_BB is empty except for a label, it is the target of every | |
5589 | other basic block in the function that ends in a return. If a | |
5590 | target has a return or simple_return pattern (possibly with | |
5591 | conditional variants), these basic blocks can be changed so that a | |
5592 | return insn is emitted into them, and their target is adjusted to | |
5593 | the real exit block. | |
5594 | ||
5595 | Notes on shrink wrapping: We implement a fairly conservative | |
5596 | version of shrink-wrapping rather than the textbook one. We only | |
5597 | generate a single prologue and a single epilogue. This is | |
5598 | sufficient to catch a number of interesting cases involving early | |
5599 | exits. | |
5600 | ||
5601 | First, we identify the blocks that require the prologue to occur before | |
5602 | them. These are the ones that modify a call-saved register, or reference | |
5603 | any of the stack or frame pointer registers. To simplify things, we then | |
5604 | mark everything reachable from these blocks as also requiring a prologue. | |
5605 | This takes care of loops automatically, and avoids the need to examine | |
5606 | whether MEMs reference the frame, since it is sufficient to check for | |
5607 | occurrences of the stack or frame pointer. | |
5608 | ||
5609 | We then compute the set of blocks for which the need for a prologue | |
5610 | is anticipatable (borrowing terminology from the shrink-wrapping | |
5611 | description in Muchnick's book). These are the blocks which either | |
5612 | require a prologue themselves, or those that have only successors | |
5613 | where the prologue is anticipatable. The prologue needs to be | |
5614 | inserted on all edges from BB1->BB2 where BB2 is in ANTIC and BB1 | |
5615 | is not. For the moment, we ensure that only one such edge exists. | |
5616 | ||
5617 | The epilogue is placed as described above, but we make a | |
5618 | distinction between inserting return and simple_return patterns | |
5619 | when modifying other blocks that end in a return. Blocks that end | |
5620 | in a sibcall omit the sibcall_epilogue if the block is not in | |
5621 | ANTIC. */ | |
bdac5f58 | 5622 | |
6fb5fa3c DB |
5623 | static void |
5624 | thread_prologue_and_epilogue_insns (void) | |
bdac5f58 | 5625 | { |
7458026b | 5626 | bool inserted; |
484db665 | 5627 | #ifdef HAVE_simple_return |
6e1aa848 | 5628 | vec<edge> unconverted_simple_returns = vNULL; |
ffe14686 | 5629 | bitmap_head bb_flags; |
484db665 | 5630 | #endif |
9c8348cf | 5631 | rtx_insn *returnjump; |
9c8348cf | 5632 | rtx_insn *epilogue_end ATTRIBUTE_UNUSED; |
dc01c3d1 | 5633 | rtx_insn *prologue_seq ATTRIBUTE_UNUSED, *split_prologue_seq ATTRIBUTE_UNUSED; |
484db665 | 5634 | edge e, entry_edge, orig_entry_edge, exit_fallthru_edge; |
628f6a4e | 5635 | edge_iterator ei; |
484db665 BS |
5636 | |
5637 | df_analyze (); | |
e881bb1b | 5638 | |
fefa31b5 | 5639 | rtl_profile_for_bb (ENTRY_BLOCK_PTR_FOR_FN (cfun)); |
7458026b ILT |
5640 | |
5641 | inserted = false; | |
9c8348cf DM |
5642 | epilogue_end = NULL; |
5643 | returnjump = NULL; | |
7458026b ILT |
5644 | |
5645 | /* Can't deal with multiple successors of the entry block at the | |
5646 | moment. Function should always have at least one entry | |
5647 | point. */ | |
fefa31b5 DM |
5648 | gcc_assert (single_succ_p (ENTRY_BLOCK_PTR_FOR_FN (cfun))); |
5649 | entry_edge = single_succ_edge (ENTRY_BLOCK_PTR_FOR_FN (cfun)); | |
484db665 BS |
5650 | orig_entry_edge = entry_edge; |
5651 | ||
dc01c3d1 | 5652 | split_prologue_seq = NULL; |
7458026b ILT |
5653 | if (flag_split_stack |
5654 | && (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (cfun->decl)) | |
5655 | == NULL)) | |
5656 | { | |
5657 | #ifndef HAVE_split_stack_prologue | |
5658 | gcc_unreachable (); | |
5659 | #else | |
5660 | gcc_assert (HAVE_split_stack_prologue); | |
5661 | ||
5662 | start_sequence (); | |
5663 | emit_insn (gen_split_stack_prologue ()); | |
484db665 | 5664 | split_prologue_seq = get_insns (); |
7458026b ILT |
5665 | end_sequence (); |
5666 | ||
484db665 | 5667 | record_insns (split_prologue_seq, NULL, &prologue_insn_hash); |
5368224f | 5668 | set_insn_locations (split_prologue_seq, prologue_location); |
7458026b ILT |
5669 | #endif |
5670 | } | |
5671 | ||
dc01c3d1 | 5672 | prologue_seq = NULL; |
bdac5f58 TW |
5673 | #ifdef HAVE_prologue |
5674 | if (HAVE_prologue) | |
5675 | { | |
e881bb1b | 5676 | start_sequence (); |
dc01c3d1 | 5677 | rtx_insn *seq = safe_as_a <rtx_insn *> (gen_prologue ()); |
e881bb1b | 5678 | emit_insn (seq); |
bdac5f58 | 5679 | |
b8698a0f | 5680 | /* Insert an explicit USE for the frame pointer |
6fb5fa3c | 5681 | if the profiling is on and the frame pointer is required. */ |
e3b5732b | 5682 | if (crtl->profile && frame_pointer_needed) |
c41c1387 | 5683 | emit_use (hard_frame_pointer_rtx); |
6fb5fa3c | 5684 | |
bdac5f58 | 5685 | /* Retain a map of the prologue insns. */ |
cd9c1ca8 | 5686 | record_insns (seq, NULL, &prologue_insn_hash); |
56d17681 | 5687 | emit_note (NOTE_INSN_PROLOGUE_END); |
b8698a0f | 5688 | |
56d17681 UB |
5689 | /* Ensure that instructions are not moved into the prologue when |
5690 | profiling is on. The call to the profiling routine can be | |
5691 | emitted within the live range of a call-clobbered register. */ | |
3c5273a9 | 5692 | if (!targetm.profile_before_prologue () && crtl->profile) |
56d17681 | 5693 | emit_insn (gen_blockage ()); |
9185a8d5 | 5694 | |
484db665 | 5695 | prologue_seq = get_insns (); |
e881bb1b | 5696 | end_sequence (); |
5368224f | 5697 | set_insn_locations (prologue_seq, prologue_location); |
484db665 BS |
5698 | } |
5699 | #endif | |
e881bb1b | 5700 | |
ffe14686 | 5701 | #ifdef HAVE_simple_return |
484db665 BS |
5702 | bitmap_initialize (&bb_flags, &bitmap_default_obstack); |
5703 | ||
484db665 BS |
5704 | /* Try to perform a kind of shrink-wrapping, making sure the |
5705 | prologue/epilogue is emitted only around those parts of the | |
5706 | function that require it. */ | |
5707 | ||
f30e25a3 | 5708 | try_shrink_wrapping (&entry_edge, orig_entry_edge, &bb_flags, prologue_seq); |
bdac5f58 | 5709 | #endif |
bdac5f58 | 5710 | |
484db665 BS |
5711 | if (split_prologue_seq != NULL_RTX) |
5712 | { | |
f4b31a33 | 5713 | insert_insn_on_edge (split_prologue_seq, orig_entry_edge); |
484db665 BS |
5714 | inserted = true; |
5715 | } | |
5716 | if (prologue_seq != NULL_RTX) | |
5717 | { | |
5718 | insert_insn_on_edge (prologue_seq, entry_edge); | |
5719 | inserted = true; | |
5720 | } | |
5721 | ||
19d3c25c RH |
5722 | /* If the exit block has no non-fake predecessors, we don't need |
5723 | an epilogue. */ | |
fefa31b5 | 5724 | FOR_EACH_EDGE (e, ei, EXIT_BLOCK_PTR_FOR_FN (cfun)->preds) |
19d3c25c RH |
5725 | if ((e->flags & EDGE_FAKE) == 0) |
5726 | break; | |
5727 | if (e == NULL) | |
5728 | goto epilogue_done; | |
5729 | ||
fefa31b5 | 5730 | rtl_profile_for_bb (EXIT_BLOCK_PTR_FOR_FN (cfun)); |
484db665 | 5731 | |
fefa31b5 | 5732 | exit_fallthru_edge = find_fallthru_edge (EXIT_BLOCK_PTR_FOR_FN (cfun)->preds); |
ffe14686 | 5733 | |
ffe14686 AM |
5734 | #ifdef HAVE_simple_return |
5735 | if (entry_edge != orig_entry_edge) | |
f30e25a3 ZC |
5736 | exit_fallthru_edge |
5737 | = get_unconverted_simple_return (exit_fallthru_edge, bb_flags, | |
5738 | &unconverted_simple_returns, | |
5739 | &returnjump); | |
484db665 | 5740 | #endif |
ffe14686 AM |
5741 | #ifdef HAVE_return |
5742 | if (HAVE_return) | |
5743 | { | |
5744 | if (exit_fallthru_edge == NULL) | |
5745 | goto epilogue_done; | |
69732dcb | 5746 | |
ffe14686 AM |
5747 | if (optimize) |
5748 | { | |
5749 | basic_block last_bb = exit_fallthru_edge->src; | |
484db665 | 5750 | |
ffe14686 AM |
5751 | if (LABEL_P (BB_HEAD (last_bb)) |
5752 | && !active_insn_between (BB_HEAD (last_bb), BB_END (last_bb))) | |
6e1aa848 | 5753 | convert_jumps_to_returns (last_bb, false, vNULL); |
ffe14686 | 5754 | |
1ff2fd21 AM |
5755 | if (EDGE_COUNT (last_bb->preds) != 0 |
5756 | && single_succ_p (last_bb)) | |
484db665 | 5757 | { |
ffe14686 AM |
5758 | last_bb = emit_return_for_exit (exit_fallthru_edge, false); |
5759 | epilogue_end = returnjump = BB_END (last_bb); | |
484db665 | 5760 | #ifdef HAVE_simple_return |
ffe14686 AM |
5761 | /* Emitting the return may add a basic block. |
5762 | Fix bb_flags for the added block. */ | |
5763 | if (last_bb != exit_fallthru_edge->src) | |
5764 | bitmap_set_bit (&bb_flags, last_bb->index); | |
484db665 | 5765 | #endif |
ffe14686 | 5766 | goto epilogue_done; |
69732dcb | 5767 | } |
2dd8bc01 | 5768 | } |
69732dcb RH |
5769 | } |
5770 | #endif | |
cd9c1ca8 RH |
5771 | |
5772 | /* A small fib -- epilogue is not yet completed, but we wish to re-use | |
5773 | this marker for the splits of EH_RETURN patterns, and nothing else | |
5774 | uses the flag in the meantime. */ | |
5775 | epilogue_completed = 1; | |
5776 | ||
5777 | #ifdef HAVE_eh_return | |
5778 | /* Find non-fallthru edges that end with EH_RETURN instructions. On | |
5779 | some targets, these get split to a special version of the epilogue | |
5780 | code. In order to be able to properly annotate these with unwind | |
5781 | info, try to split them now. If we get a valid split, drop an | |
5782 | EPILOGUE_BEG note and mark the insns as epilogue insns. */ | |
fefa31b5 | 5783 | FOR_EACH_EDGE (e, ei, EXIT_BLOCK_PTR_FOR_FN (cfun)->preds) |
cd9c1ca8 | 5784 | { |
691fe203 | 5785 | rtx_insn *prev, *last, *trial; |
cd9c1ca8 RH |
5786 | |
5787 | if (e->flags & EDGE_FALLTHRU) | |
5788 | continue; | |
5789 | last = BB_END (e->src); | |
5790 | if (!eh_returnjump_p (last)) | |
5791 | continue; | |
5792 | ||
5793 | prev = PREV_INSN (last); | |
5794 | trial = try_split (PATTERN (last), last, 1); | |
5795 | if (trial == last) | |
5796 | continue; | |
5797 | ||
5798 | record_insns (NEXT_INSN (prev), NEXT_INSN (trial), &epilogue_insn_hash); | |
5799 | emit_note_after (NOTE_INSN_EPILOGUE_BEG, prev); | |
5800 | } | |
5801 | #endif | |
5802 | ||
484db665 BS |
5803 | /* If nothing falls through into the exit block, we don't need an |
5804 | epilogue. */ | |
623a66fa | 5805 | |
484db665 | 5806 | if (exit_fallthru_edge == NULL) |
623a66fa R |
5807 | goto epilogue_done; |
5808 | ||
bdac5f58 TW |
5809 | #ifdef HAVE_epilogue |
5810 | if (HAVE_epilogue) | |
5811 | { | |
19d3c25c | 5812 | start_sequence (); |
2e040219 | 5813 | epilogue_end = emit_note (NOTE_INSN_EPILOGUE_BEG); |
dc01c3d1 | 5814 | rtx_insn *seq = as_a <rtx_insn *> (gen_epilogue ()); |
55c623b5 UW |
5815 | if (seq) |
5816 | emit_jump_insn (seq); | |
bdac5f58 | 5817 | |
19d3c25c | 5818 | /* Retain a map of the epilogue insns. */ |
cd9c1ca8 | 5819 | record_insns (seq, NULL, &epilogue_insn_hash); |
5368224f | 5820 | set_insn_locations (seq, epilogue_location); |
bdac5f58 | 5821 | |
2f937369 | 5822 | seq = get_insns (); |
484db665 | 5823 | returnjump = get_last_insn (); |
718fe406 | 5824 | end_sequence (); |
e881bb1b | 5825 | |
484db665 | 5826 | insert_insn_on_edge (seq, exit_fallthru_edge); |
7458026b | 5827 | inserted = true; |
dc0ff1c8 BS |
5828 | |
5829 | if (JUMP_P (returnjump)) | |
387748de | 5830 | set_return_jump_label (returnjump); |
bdac5f58 | 5831 | } |
623a66fa | 5832 | else |
bdac5f58 | 5833 | #endif |
623a66fa R |
5834 | { |
5835 | basic_block cur_bb; | |
5836 | ||
484db665 | 5837 | if (! next_active_insn (BB_END (exit_fallthru_edge->src))) |
623a66fa R |
5838 | goto epilogue_done; |
5839 | /* We have a fall-through edge to the exit block, the source is not | |
5840 | at the end of the function, and there will be an assembler epilogue | |
5841 | at the end of the function. | |
5842 | We can't use force_nonfallthru here, because that would try to | |
484db665 | 5843 | use return. Inserting a jump 'by hand' is extremely messy, so |
623a66fa | 5844 | we take advantage of cfg_layout_finalize using |
484db665 | 5845 | fixup_fallthru_exit_predecessor. */ |
35b6b437 | 5846 | cfg_layout_initialize (0); |
11cd3bed | 5847 | FOR_EACH_BB_FN (cur_bb, cfun) |
24bd1a0b DB |
5848 | if (cur_bb->index >= NUM_FIXED_BLOCKS |
5849 | && cur_bb->next_bb->index >= NUM_FIXED_BLOCKS) | |
370369e1 | 5850 | cur_bb->aux = cur_bb->next_bb; |
623a66fa R |
5851 | cfg_layout_finalize (); |
5852 | } | |
cf103ca4 | 5853 | |
19d3c25c | 5854 | epilogue_done: |
484db665 | 5855 | |
a8ba47cb | 5856 | default_rtl_profile (); |
e881bb1b | 5857 | |
ca1117cc | 5858 | if (inserted) |
30a873c3 | 5859 | { |
cf103ca4 EB |
5860 | sbitmap blocks; |
5861 | ||
30a873c3 ZD |
5862 | commit_edge_insertions (); |
5863 | ||
cf103ca4 | 5864 | /* Look for basic blocks within the prologue insns. */ |
8b1c6fd7 | 5865 | blocks = sbitmap_alloc (last_basic_block_for_fn (cfun)); |
f61e445a | 5866 | bitmap_clear (blocks); |
d7c028c0 LC |
5867 | bitmap_set_bit (blocks, entry_edge->dest->index); |
5868 | bitmap_set_bit (blocks, orig_entry_edge->dest->index); | |
cf103ca4 EB |
5869 | find_many_sub_basic_blocks (blocks); |
5870 | sbitmap_free (blocks); | |
5871 | ||
30a873c3 ZD |
5872 | /* The epilogue insns we inserted may cause the exit edge to no longer |
5873 | be fallthru. */ | |
fefa31b5 | 5874 | FOR_EACH_EDGE (e, ei, EXIT_BLOCK_PTR_FOR_FN (cfun)->preds) |
30a873c3 ZD |
5875 | { |
5876 | if (((e->flags & EDGE_FALLTHRU) != 0) | |
5877 | && returnjump_p (BB_END (e->src))) | |
5878 | e->flags &= ~EDGE_FALLTHRU; | |
5879 | } | |
5880 | } | |
0a1c58a2 | 5881 | |
484db665 | 5882 | #ifdef HAVE_simple_return |
f30e25a3 ZC |
5883 | convert_to_simple_return (entry_edge, orig_entry_edge, bb_flags, returnjump, |
5884 | unconverted_simple_returns); | |
484db665 BS |
5885 | #endif |
5886 | ||
0a1c58a2 JL |
5887 | #ifdef HAVE_sibcall_epilogue |
5888 | /* Emit sibling epilogues before any sibling call sites. */ | |
fefa31b5 DM |
5889 | for (ei = ei_start (EXIT_BLOCK_PTR_FOR_FN (cfun)->preds); (e = |
5890 | ei_safe_edge (ei)); | |
5891 | ) | |
0a1c58a2 JL |
5892 | { |
5893 | basic_block bb = e->src; | |
691fe203 | 5894 | rtx_insn *insn = BB_END (bb); |
484db665 | 5895 | rtx ep_seq; |
0a1c58a2 | 5896 | |
4b4bf941 | 5897 | if (!CALL_P (insn) |
484db665 | 5898 | || ! SIBLING_CALL_P (insn) |
ffe14686 | 5899 | #ifdef HAVE_simple_return |
484db665 | 5900 | || (entry_edge != orig_entry_edge |
ffe14686 AM |
5901 | && !bitmap_bit_p (&bb_flags, bb->index)) |
5902 | #endif | |
5903 | ) | |
628f6a4e BE |
5904 | { |
5905 | ei_next (&ei); | |
5906 | continue; | |
5907 | } | |
0a1c58a2 | 5908 | |
484db665 BS |
5909 | ep_seq = gen_sibcall_epilogue (); |
5910 | if (ep_seq) | |
5911 | { | |
5912 | start_sequence (); | |
5913 | emit_note (NOTE_INSN_EPILOGUE_BEG); | |
5914 | emit_insn (ep_seq); | |
dc01c3d1 | 5915 | rtx_insn *seq = get_insns (); |
484db665 | 5916 | end_sequence (); |
0a1c58a2 | 5917 | |
484db665 BS |
5918 | /* Retain a map of the epilogue insns. Used in life analysis to |
5919 | avoid getting rid of sibcall epilogue insns. Do this before we | |
5920 | actually emit the sequence. */ | |
5921 | record_insns (seq, NULL, &epilogue_insn_hash); | |
5368224f | 5922 | set_insn_locations (seq, epilogue_location); |
2f937369 | 5923 | |
484db665 BS |
5924 | emit_insn_before (seq, insn); |
5925 | } | |
628f6a4e | 5926 | ei_next (&ei); |
0a1c58a2 JL |
5927 | } |
5928 | #endif | |
ca1117cc | 5929 | |
86c82654 RH |
5930 | #ifdef HAVE_epilogue |
5931 | if (epilogue_end) | |
5932 | { | |
9c8348cf | 5933 | rtx_insn *insn, *next; |
86c82654 RH |
5934 | |
5935 | /* Similarly, move any line notes that appear after the epilogue. | |
ff7cc307 | 5936 | There is no need, however, to be quite so anal about the existence |
071a42f9 | 5937 | of such a note. Also possibly move |
84c1fa24 UW |
5938 | NOTE_INSN_FUNCTION_BEG notes, as those can be relevant for debug |
5939 | info generation. */ | |
718fe406 | 5940 | for (insn = epilogue_end; insn; insn = next) |
86c82654 RH |
5941 | { |
5942 | next = NEXT_INSN (insn); | |
b8698a0f | 5943 | if (NOTE_P (insn) |
a38e7aa5 | 5944 | && (NOTE_KIND (insn) == NOTE_INSN_FUNCTION_BEG)) |
86c82654 RH |
5945 | reorder_insns (insn, insn, PREV_INSN (epilogue_end)); |
5946 | } | |
5947 | } | |
5948 | #endif | |
6fb5fa3c | 5949 | |
ffe14686 | 5950 | #ifdef HAVE_simple_return |
484db665 | 5951 | bitmap_clear (&bb_flags); |
ffe14686 | 5952 | #endif |
484db665 | 5953 | |
6fb5fa3c DB |
5954 | /* Threading the prologue and epilogue changes the artificial refs |
5955 | in the entry and exit blocks. */ | |
5956 | epilogue_completed = 1; | |
5957 | df_update_entry_exit_and_calls (); | |
bdac5f58 TW |
5958 | } |
5959 | ||
cd9c1ca8 RH |
5960 | /* Reposition the prologue-end and epilogue-begin notes after |
5961 | instruction scheduling. */ | |
bdac5f58 TW |
5962 | |
5963 | void | |
6fb5fa3c | 5964 | reposition_prologue_and_epilogue_notes (void) |
bdac5f58 | 5965 | { |
cd9c1ca8 RH |
5966 | #if defined (HAVE_prologue) || defined (HAVE_epilogue) \ |
5967 | || defined (HAVE_sibcall_epilogue) | |
cd9c1ca8 RH |
5968 | /* Since the hash table is created on demand, the fact that it is |
5969 | non-null is a signal that it is non-empty. */ | |
5970 | if (prologue_insn_hash != NULL) | |
bdac5f58 | 5971 | { |
cd9c1ca8 | 5972 | size_t len = htab_elements (prologue_insn_hash); |
691fe203 | 5973 | rtx_insn *insn, *last = NULL, *note = NULL; |
bdac5f58 | 5974 | |
cd9c1ca8 RH |
5975 | /* Scan from the beginning until we reach the last prologue insn. */ |
5976 | /* ??? While we do have the CFG intact, there are two problems: | |
5977 | (1) The prologue can contain loops (typically probing the stack), | |
5978 | which means that the end of the prologue isn't in the first bb. | |
5979 | (2) Sometimes the PROLOGUE_END note gets pushed into the next bb. */ | |
6fb5fa3c | 5980 | for (insn = get_insns (); insn; insn = NEXT_INSN (insn)) |
bdac5f58 | 5981 | { |
4b4bf941 | 5982 | if (NOTE_P (insn)) |
9392c110 | 5983 | { |
a38e7aa5 | 5984 | if (NOTE_KIND (insn) == NOTE_INSN_PROLOGUE_END) |
0a1c58a2 JL |
5985 | note = insn; |
5986 | } | |
cd9c1ca8 | 5987 | else if (contains (insn, prologue_insn_hash)) |
0a1c58a2 | 5988 | { |
9f53e965 RH |
5989 | last = insn; |
5990 | if (--len == 0) | |
5991 | break; | |
5992 | } | |
5993 | } | |
797a6ac1 | 5994 | |
9f53e965 RH |
5995 | if (last) |
5996 | { | |
cd9c1ca8 | 5997 | if (note == NULL) |
9f53e965 | 5998 | { |
cd9c1ca8 RH |
5999 | /* Scan forward looking for the PROLOGUE_END note. It should |
6000 | be right at the beginning of the block, possibly with other | |
6001 | insn notes that got moved there. */ | |
6002 | for (note = NEXT_INSN (last); ; note = NEXT_INSN (note)) | |
6003 | { | |
6004 | if (NOTE_P (note) | |
6005 | && NOTE_KIND (note) == NOTE_INSN_PROLOGUE_END) | |
6006 | break; | |
6007 | } | |
9f53e965 | 6008 | } |
c93b03c2 | 6009 | |
9f53e965 | 6010 | /* Avoid placing note between CODE_LABEL and BASIC_BLOCK note. */ |
4b4bf941 | 6011 | if (LABEL_P (last)) |
9f53e965 RH |
6012 | last = NEXT_INSN (last); |
6013 | reorder_insns (note, note, last); | |
bdac5f58 | 6014 | } |
0a1c58a2 JL |
6015 | } |
6016 | ||
cd9c1ca8 | 6017 | if (epilogue_insn_hash != NULL) |
0a1c58a2 | 6018 | { |
cd9c1ca8 RH |
6019 | edge_iterator ei; |
6020 | edge e; | |
bdac5f58 | 6021 | |
fefa31b5 | 6022 | FOR_EACH_EDGE (e, ei, EXIT_BLOCK_PTR_FOR_FN (cfun)->preds) |
bdac5f58 | 6023 | { |
691fe203 | 6024 | rtx_insn *insn, *first = NULL, *note = NULL; |
997704f1 | 6025 | basic_block bb = e->src; |
c93b03c2 | 6026 | |
997704f1 | 6027 | /* Scan from the beginning until we reach the first epilogue insn. */ |
cd9c1ca8 | 6028 | FOR_BB_INSNS (bb, insn) |
9f53e965 | 6029 | { |
cd9c1ca8 RH |
6030 | if (NOTE_P (insn)) |
6031 | { | |
6032 | if (NOTE_KIND (insn) == NOTE_INSN_EPILOGUE_BEG) | |
6033 | { | |
6034 | note = insn; | |
997704f1 | 6035 | if (first != NULL) |
cd9c1ca8 RH |
6036 | break; |
6037 | } | |
6038 | } | |
997704f1 | 6039 | else if (first == NULL && contains (insn, epilogue_insn_hash)) |
cd9c1ca8 | 6040 | { |
997704f1 | 6041 | first = insn; |
cd9c1ca8 RH |
6042 | if (note != NULL) |
6043 | break; | |
6044 | } | |
9392c110 | 6045 | } |
997704f1 RH |
6046 | |
6047 | if (note) | |
6048 | { | |
6049 | /* If the function has a single basic block, and no real | |
b8698a0f | 6050 | epilogue insns (e.g. sibcall with no cleanup), the |
997704f1 RH |
6051 | epilogue note can get scheduled before the prologue |
6052 | note. If we have frame related prologue insns, having | |
6053 | them scanned during the epilogue will result in a crash. | |
6054 | In this case re-order the epilogue note to just before | |
6055 | the last insn in the block. */ | |
6056 | if (first == NULL) | |
6057 | first = BB_END (bb); | |
6058 | ||
6059 | if (PREV_INSN (first) != note) | |
6060 | reorder_insns (note, note, PREV_INSN (first)); | |
6061 | } | |
bdac5f58 TW |
6062 | } |
6063 | } | |
6064 | #endif /* HAVE_prologue or HAVE_epilogue */ | |
6065 | } | |
87ff9c8e | 6066 | |
df92c640 SB |
6067 | /* Returns the name of function declared by FNDECL. */ |
6068 | const char * | |
6069 | fndecl_name (tree fndecl) | |
6070 | { | |
6071 | if (fndecl == NULL) | |
6072 | return "(nofn)"; | |
6073 | return lang_hooks.decl_printable_name (fndecl, 2); | |
6074 | } | |
6075 | ||
532aafad SB |
6076 | /* Returns the name of function FN. */ |
6077 | const char * | |
6078 | function_name (struct function *fn) | |
6079 | { | |
df92c640 SB |
6080 | tree fndecl = (fn == NULL) ? NULL : fn->decl; |
6081 | return fndecl_name (fndecl); | |
532aafad SB |
6082 | } |
6083 | ||
faed5cc3 SB |
6084 | /* Returns the name of the current function. */ |
6085 | const char * | |
6086 | current_function_name (void) | |
6087 | { | |
532aafad | 6088 | return function_name (cfun); |
faed5cc3 | 6089 | } |
ef330312 PB |
6090 | \f |
6091 | ||
c2924966 | 6092 | static unsigned int |
ef330312 PB |
6093 | rest_of_handle_check_leaf_regs (void) |
6094 | { | |
6095 | #ifdef LEAF_REGISTERS | |
416ff32e | 6096 | crtl->uses_only_leaf_regs |
ef330312 PB |
6097 | = optimize > 0 && only_leaf_regs_used () && leaf_function_p (); |
6098 | #endif | |
c2924966 | 6099 | return 0; |
ef330312 PB |
6100 | } |
6101 | ||
8d8d1a28 | 6102 | /* Insert a TYPE into the used types hash table of CFUN. */ |
b646ba3f | 6103 | |
8d8d1a28 AH |
6104 | static void |
6105 | used_types_insert_helper (tree type, struct function *func) | |
33c9159e | 6106 | { |
8d8d1a28 | 6107 | if (type != NULL && func != NULL) |
33c9159e | 6108 | { |
33c9159e | 6109 | if (func->used_types_hash == NULL) |
b086d530 TS |
6110 | func->used_types_hash = hash_set<tree>::create_ggc (37); |
6111 | ||
6112 | func->used_types_hash->add (type); | |
33c9159e AH |
6113 | } |
6114 | } | |
6115 | ||
8d8d1a28 AH |
6116 | /* Given a type, insert it into the used hash table in cfun. */ |
6117 | void | |
6118 | used_types_insert (tree t) | |
6119 | { | |
6120 | while (POINTER_TYPE_P (t) || TREE_CODE (t) == ARRAY_TYPE) | |
095c7b3c JJ |
6121 | if (TYPE_NAME (t)) |
6122 | break; | |
6123 | else | |
6124 | t = TREE_TYPE (t); | |
29ce73cb PB |
6125 | if (TREE_CODE (t) == ERROR_MARK) |
6126 | return; | |
095c7b3c JJ |
6127 | if (TYPE_NAME (t) == NULL_TREE |
6128 | || TYPE_NAME (t) == TYPE_NAME (TYPE_MAIN_VARIANT (t))) | |
6129 | t = TYPE_MAIN_VARIANT (t); | |
8d8d1a28 | 6130 | if (debug_info_level > DINFO_LEVEL_NONE) |
b646ba3f DS |
6131 | { |
6132 | if (cfun) | |
6133 | used_types_insert_helper (t, cfun); | |
6134 | else | |
9771b263 DN |
6135 | { |
6136 | /* So this might be a type referenced by a global variable. | |
6137 | Record that type so that we can later decide to emit its | |
6138 | debug information. */ | |
6139 | vec_safe_push (types_used_by_cur_var_decl, t); | |
6140 | } | |
b646ba3f DS |
6141 | } |
6142 | } | |
6143 | ||
6144 | /* Helper to Hash a struct types_used_by_vars_entry. */ | |
6145 | ||
6146 | static hashval_t | |
6147 | hash_types_used_by_vars_entry (const struct types_used_by_vars_entry *entry) | |
6148 | { | |
6149 | gcc_assert (entry && entry->var_decl && entry->type); | |
6150 | ||
6151 | return iterative_hash_object (entry->type, | |
6152 | iterative_hash_object (entry->var_decl, 0)); | |
6153 | } | |
6154 | ||
6155 | /* Hash function of the types_used_by_vars_entry hash table. */ | |
6156 | ||
6157 | hashval_t | |
2a22f99c | 6158 | used_type_hasher::hash (types_used_by_vars_entry *entry) |
b646ba3f | 6159 | { |
b646ba3f DS |
6160 | return hash_types_used_by_vars_entry (entry); |
6161 | } | |
6162 | ||
6163 | /*Equality function of the types_used_by_vars_entry hash table. */ | |
6164 | ||
2a22f99c TS |
6165 | bool |
6166 | used_type_hasher::equal (types_used_by_vars_entry *e1, | |
6167 | types_used_by_vars_entry *e2) | |
b646ba3f | 6168 | { |
b646ba3f DS |
6169 | return (e1->var_decl == e2->var_decl && e1->type == e2->type); |
6170 | } | |
6171 | ||
6172 | /* Inserts an entry into the types_used_by_vars_hash hash table. */ | |
6173 | ||
6174 | void | |
6175 | types_used_by_var_decl_insert (tree type, tree var_decl) | |
6176 | { | |
6177 | if (type != NULL && var_decl != NULL) | |
6178 | { | |
2a22f99c | 6179 | types_used_by_vars_entry **slot; |
b646ba3f DS |
6180 | struct types_used_by_vars_entry e; |
6181 | e.var_decl = var_decl; | |
6182 | e.type = type; | |
6183 | if (types_used_by_vars_hash == NULL) | |
2a22f99c TS |
6184 | types_used_by_vars_hash |
6185 | = hash_table<used_type_hasher>::create_ggc (37); | |
6186 | ||
6187 | slot = types_used_by_vars_hash->find_slot (&e, INSERT); | |
b646ba3f DS |
6188 | if (*slot == NULL) |
6189 | { | |
6190 | struct types_used_by_vars_entry *entry; | |
766090c2 | 6191 | entry = ggc_alloc<types_used_by_vars_entry> (); |
b646ba3f DS |
6192 | entry->type = type; |
6193 | entry->var_decl = var_decl; | |
6194 | *slot = entry; | |
6195 | } | |
6196 | } | |
8d8d1a28 AH |
6197 | } |
6198 | ||
27a4cd48 DM |
6199 | namespace { |
6200 | ||
6201 | const pass_data pass_data_leaf_regs = | |
6202 | { | |
6203 | RTL_PASS, /* type */ | |
6204 | "*leaf_regs", /* name */ | |
6205 | OPTGROUP_NONE, /* optinfo_flags */ | |
27a4cd48 DM |
6206 | TV_NONE, /* tv_id */ |
6207 | 0, /* properties_required */ | |
6208 | 0, /* properties_provided */ | |
6209 | 0, /* properties_destroyed */ | |
6210 | 0, /* todo_flags_start */ | |
6211 | 0, /* todo_flags_finish */ | |
ef330312 PB |
6212 | }; |
6213 | ||
27a4cd48 DM |
6214 | class pass_leaf_regs : public rtl_opt_pass |
6215 | { | |
6216 | public: | |
c3284718 RS |
6217 | pass_leaf_regs (gcc::context *ctxt) |
6218 | : rtl_opt_pass (pass_data_leaf_regs, ctxt) | |
27a4cd48 DM |
6219 | {} |
6220 | ||
6221 | /* opt_pass methods: */ | |
be55bfe6 TS |
6222 | virtual unsigned int execute (function *) |
6223 | { | |
6224 | return rest_of_handle_check_leaf_regs (); | |
6225 | } | |
27a4cd48 DM |
6226 | |
6227 | }; // class pass_leaf_regs | |
6228 | ||
6229 | } // anon namespace | |
6230 | ||
6231 | rtl_opt_pass * | |
6232 | make_pass_leaf_regs (gcc::context *ctxt) | |
6233 | { | |
6234 | return new pass_leaf_regs (ctxt); | |
6235 | } | |
6236 | ||
6fb5fa3c DB |
6237 | static unsigned int |
6238 | rest_of_handle_thread_prologue_and_epilogue (void) | |
6239 | { | |
6240 | if (optimize) | |
6241 | cleanup_cfg (CLEANUP_EXPENSIVE); | |
d3c12306 | 6242 | |
6fb5fa3c DB |
6243 | /* On some machines, the prologue and epilogue code, or parts thereof, |
6244 | can be represented as RTL. Doing so lets us schedule insns between | |
6245 | it and the rest of the code and also allows delayed branch | |
6246 | scheduling to operate in the epilogue. */ | |
6fb5fa3c | 6247 | thread_prologue_and_epilogue_insns (); |
d3c12306 | 6248 | |
bdc6e1ae SB |
6249 | /* Shrink-wrapping can result in unreachable edges in the epilogue, |
6250 | see PR57320. */ | |
6251 | cleanup_cfg (0); | |
6252 | ||
d3c12306 | 6253 | /* The stack usage info is finalized during prologue expansion. */ |
a11e0df4 | 6254 | if (flag_stack_usage_info) |
d3c12306 EB |
6255 | output_stack_usage (); |
6256 | ||
6fb5fa3c DB |
6257 | return 0; |
6258 | } | |
6259 | ||
27a4cd48 DM |
6260 | namespace { |
6261 | ||
6262 | const pass_data pass_data_thread_prologue_and_epilogue = | |
6263 | { | |
6264 | RTL_PASS, /* type */ | |
6265 | "pro_and_epilogue", /* name */ | |
6266 | OPTGROUP_NONE, /* optinfo_flags */ | |
27a4cd48 DM |
6267 | TV_THREAD_PROLOGUE_AND_EPILOGUE, /* tv_id */ |
6268 | 0, /* properties_required */ | |
6269 | 0, /* properties_provided */ | |
6270 | 0, /* properties_destroyed */ | |
3bea341f RB |
6271 | 0, /* todo_flags_start */ |
6272 | ( TODO_df_verify | TODO_df_finish ), /* todo_flags_finish */ | |
6fb5fa3c | 6273 | }; |
27a4cd48 DM |
6274 | |
6275 | class pass_thread_prologue_and_epilogue : public rtl_opt_pass | |
6276 | { | |
6277 | public: | |
c3284718 RS |
6278 | pass_thread_prologue_and_epilogue (gcc::context *ctxt) |
6279 | : rtl_opt_pass (pass_data_thread_prologue_and_epilogue, ctxt) | |
27a4cd48 DM |
6280 | {} |
6281 | ||
6282 | /* opt_pass methods: */ | |
be55bfe6 TS |
6283 | virtual unsigned int execute (function *) |
6284 | { | |
6285 | return rest_of_handle_thread_prologue_and_epilogue (); | |
6286 | } | |
27a4cd48 DM |
6287 | |
6288 | }; // class pass_thread_prologue_and_epilogue | |
6289 | ||
6290 | } // anon namespace | |
6291 | ||
6292 | rtl_opt_pass * | |
6293 | make_pass_thread_prologue_and_epilogue (gcc::context *ctxt) | |
6294 | { | |
6295 | return new pass_thread_prologue_and_epilogue (ctxt); | |
6296 | } | |
d8d72314 PB |
6297 | \f |
6298 | ||
6299 | /* This mini-pass fixes fall-out from SSA in asm statements that have | |
b8698a0f | 6300 | in-out constraints. Say you start with |
d8d72314 PB |
6301 | |
6302 | orig = inout; | |
6303 | asm ("": "+mr" (inout)); | |
6304 | use (orig); | |
6305 | ||
6306 | which is transformed very early to use explicit output and match operands: | |
6307 | ||
6308 | orig = inout; | |
6309 | asm ("": "=mr" (inout) : "0" (inout)); | |
6310 | use (orig); | |
6311 | ||
6312 | Or, after SSA and copyprop, | |
6313 | ||
6314 | asm ("": "=mr" (inout_2) : "0" (inout_1)); | |
6315 | use (inout_1); | |
6316 | ||
6317 | Clearly inout_2 and inout_1 can't be coalesced easily anymore, as | |
6318 | they represent two separate values, so they will get different pseudo | |
6319 | registers during expansion. Then, since the two operands need to match | |
6320 | per the constraints, but use different pseudo registers, reload can | |
6321 | only register a reload for these operands. But reloads can only be | |
6322 | satisfied by hardregs, not by memory, so we need a register for this | |
6323 | reload, just because we are presented with non-matching operands. | |
6324 | So, even though we allow memory for this operand, no memory can be | |
6325 | used for it, just because the two operands don't match. This can | |
6326 | cause reload failures on register-starved targets. | |
6327 | ||
6328 | So it's a symptom of reload not being able to use memory for reloads | |
6329 | or, alternatively it's also a symptom of both operands not coming into | |
6330 | reload as matching (in which case the pseudo could go to memory just | |
6331 | fine, as the alternative allows it, and no reload would be necessary). | |
6332 | We fix the latter problem here, by transforming | |
6333 | ||
6334 | asm ("": "=mr" (inout_2) : "0" (inout_1)); | |
6335 | ||
6336 | back to | |
6337 | ||
6338 | inout_2 = inout_1; | |
6339 | asm ("": "=mr" (inout_2) : "0" (inout_2)); */ | |
6340 | ||
6341 | static void | |
691fe203 | 6342 | match_asm_constraints_1 (rtx_insn *insn, rtx *p_sets, int noutputs) |
d8d72314 PB |
6343 | { |
6344 | int i; | |
6345 | bool changed = false; | |
6346 | rtx op = SET_SRC (p_sets[0]); | |
6347 | int ninputs = ASM_OPERANDS_INPUT_LENGTH (op); | |
6348 | rtvec inputs = ASM_OPERANDS_INPUT_VEC (op); | |
1b4572a8 | 6349 | bool *output_matched = XALLOCAVEC (bool, noutputs); |
d8d72314 | 6350 | |
d7b8033f | 6351 | memset (output_matched, 0, noutputs * sizeof (bool)); |
d8d72314 PB |
6352 | for (i = 0; i < ninputs; i++) |
6353 | { | |
691fe203 DM |
6354 | rtx input, output; |
6355 | rtx_insn *insns; | |
d8d72314 PB |
6356 | const char *constraint = ASM_OPERANDS_INPUT_CONSTRAINT (op, i); |
6357 | char *end; | |
53220215 | 6358 | int match, j; |
d8d72314 | 6359 | |
70f16287 JJ |
6360 | if (*constraint == '%') |
6361 | constraint++; | |
6362 | ||
d8d72314 PB |
6363 | match = strtoul (constraint, &end, 10); |
6364 | if (end == constraint) | |
6365 | continue; | |
6366 | ||
6367 | gcc_assert (match < noutputs); | |
6368 | output = SET_DEST (p_sets[match]); | |
6369 | input = RTVEC_ELT (inputs, i); | |
53220215 MM |
6370 | /* Only do the transformation for pseudos. */ |
6371 | if (! REG_P (output) | |
6372 | || rtx_equal_p (output, input) | |
d8d72314 PB |
6373 | || (GET_MODE (input) != VOIDmode |
6374 | && GET_MODE (input) != GET_MODE (output))) | |
6375 | continue; | |
6376 | ||
53220215 MM |
6377 | /* We can't do anything if the output is also used as input, |
6378 | as we're going to overwrite it. */ | |
6379 | for (j = 0; j < ninputs; j++) | |
6380 | if (reg_overlap_mentioned_p (output, RTVEC_ELT (inputs, j))) | |
6381 | break; | |
6382 | if (j != ninputs) | |
6383 | continue; | |
6384 | ||
d7b8033f JJ |
6385 | /* Avoid changing the same input several times. For |
6386 | asm ("" : "=mr" (out1), "=mr" (out2) : "0" (in), "1" (in)); | |
6387 | only change in once (to out1), rather than changing it | |
6388 | first to out1 and afterwards to out2. */ | |
6389 | if (i > 0) | |
6390 | { | |
6391 | for (j = 0; j < noutputs; j++) | |
6392 | if (output_matched[j] && input == SET_DEST (p_sets[j])) | |
6393 | break; | |
6394 | if (j != noutputs) | |
6395 | continue; | |
6396 | } | |
6397 | output_matched[match] = true; | |
6398 | ||
d8d72314 | 6399 | start_sequence (); |
53220215 | 6400 | emit_move_insn (output, input); |
d8d72314 PB |
6401 | insns = get_insns (); |
6402 | end_sequence (); | |
d8d72314 | 6403 | emit_insn_before (insns, insn); |
53220215 MM |
6404 | |
6405 | /* Now replace all mentions of the input with output. We can't | |
fa10beec | 6406 | just replace the occurrence in inputs[i], as the register might |
53220215 MM |
6407 | also be used in some other input (or even in an address of an |
6408 | output), which would mean possibly increasing the number of | |
6409 | inputs by one (namely 'output' in addition), which might pose | |
6410 | a too complicated problem for reload to solve. E.g. this situation: | |
6411 | ||
6412 | asm ("" : "=r" (output), "=m" (input) : "0" (input)) | |
6413 | ||
84fbffb2 | 6414 | Here 'input' is used in two occurrences as input (once for the |
53220215 | 6415 | input operand, once for the address in the second output operand). |
fa10beec | 6416 | If we would replace only the occurrence of the input operand (to |
53220215 MM |
6417 | make the matching) we would be left with this: |
6418 | ||
6419 | output = input | |
6420 | asm ("" : "=r" (output), "=m" (input) : "0" (output)) | |
6421 | ||
6422 | Now we suddenly have two different input values (containing the same | |
6423 | value, but different pseudos) where we formerly had only one. | |
6424 | With more complicated asms this might lead to reload failures | |
6425 | which wouldn't have happen without this pass. So, iterate over | |
84fbffb2 | 6426 | all operands and replace all occurrences of the register used. */ |
53220215 | 6427 | for (j = 0; j < noutputs; j++) |
1596d61e | 6428 | if (!rtx_equal_p (SET_DEST (p_sets[j]), input) |
53220215 MM |
6429 | && reg_overlap_mentioned_p (input, SET_DEST (p_sets[j]))) |
6430 | SET_DEST (p_sets[j]) = replace_rtx (SET_DEST (p_sets[j]), | |
6431 | input, output); | |
6432 | for (j = 0; j < ninputs; j++) | |
6433 | if (reg_overlap_mentioned_p (input, RTVEC_ELT (inputs, j))) | |
6434 | RTVEC_ELT (inputs, j) = replace_rtx (RTVEC_ELT (inputs, j), | |
6435 | input, output); | |
6436 | ||
d8d72314 PB |
6437 | changed = true; |
6438 | } | |
6439 | ||
6440 | if (changed) | |
6441 | df_insn_rescan (insn); | |
6442 | } | |
6443 | ||
be55bfe6 TS |
6444 | namespace { |
6445 | ||
6446 | const pass_data pass_data_match_asm_constraints = | |
6447 | { | |
6448 | RTL_PASS, /* type */ | |
6449 | "asmcons", /* name */ | |
6450 | OPTGROUP_NONE, /* optinfo_flags */ | |
be55bfe6 TS |
6451 | TV_NONE, /* tv_id */ |
6452 | 0, /* properties_required */ | |
6453 | 0, /* properties_provided */ | |
6454 | 0, /* properties_destroyed */ | |
6455 | 0, /* todo_flags_start */ | |
6456 | 0, /* todo_flags_finish */ | |
6457 | }; | |
6458 | ||
6459 | class pass_match_asm_constraints : public rtl_opt_pass | |
6460 | { | |
6461 | public: | |
6462 | pass_match_asm_constraints (gcc::context *ctxt) | |
6463 | : rtl_opt_pass (pass_data_match_asm_constraints, ctxt) | |
6464 | {} | |
6465 | ||
6466 | /* opt_pass methods: */ | |
6467 | virtual unsigned int execute (function *); | |
6468 | ||
6469 | }; // class pass_match_asm_constraints | |
6470 | ||
6471 | unsigned | |
6472 | pass_match_asm_constraints::execute (function *fun) | |
d8d72314 PB |
6473 | { |
6474 | basic_block bb; | |
691fe203 DM |
6475 | rtx_insn *insn; |
6476 | rtx pat, *p_sets; | |
d8d72314 PB |
6477 | int noutputs; |
6478 | ||
e3b5732b | 6479 | if (!crtl->has_asm_statement) |
d8d72314 PB |
6480 | return 0; |
6481 | ||
6482 | df_set_flags (DF_DEFER_INSN_RESCAN); | |
be55bfe6 | 6483 | FOR_EACH_BB_FN (bb, fun) |
d8d72314 PB |
6484 | { |
6485 | FOR_BB_INSNS (bb, insn) | |
6486 | { | |
6487 | if (!INSN_P (insn)) | |
6488 | continue; | |
6489 | ||
6490 | pat = PATTERN (insn); | |
6491 | if (GET_CODE (pat) == PARALLEL) | |
6492 | p_sets = &XVECEXP (pat, 0, 0), noutputs = XVECLEN (pat, 0); | |
6493 | else if (GET_CODE (pat) == SET) | |
6494 | p_sets = &PATTERN (insn), noutputs = 1; | |
6495 | else | |
6496 | continue; | |
6497 | ||
6498 | if (GET_CODE (*p_sets) == SET | |
6499 | && GET_CODE (SET_SRC (*p_sets)) == ASM_OPERANDS) | |
6500 | match_asm_constraints_1 (insn, p_sets, noutputs); | |
6501 | } | |
6502 | } | |
6503 | ||
6504 | return TODO_df_finish; | |
6505 | } | |
6506 | ||
27a4cd48 DM |
6507 | } // anon namespace |
6508 | ||
6509 | rtl_opt_pass * | |
6510 | make_pass_match_asm_constraints (gcc::context *ctxt) | |
6511 | { | |
6512 | return new pass_match_asm_constraints (ctxt); | |
6513 | } | |
6514 | ||
faed5cc3 | 6515 | |
e2500fed | 6516 | #include "gt-function.h" |