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28f4ec01 BS |
1 | /* Expand builtin functions. |
2 | Copyright (C) 1988, 92-98, 1999 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of GNU CC. | |
5 | ||
6 | GNU CC is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GNU CC is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU CC; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 59 Temple Place - Suite 330, | |
19 | Boston, MA 02111-1307, USA. */ | |
20 | ||
21 | #include "config.h" | |
22 | #include "system.h" | |
23 | #include "machmode.h" | |
24 | #include "rtl.h" | |
25 | #include "tree.h" | |
26 | #include "obstack.h" | |
27 | #include "flags.h" | |
28 | #include "regs.h" | |
29 | #include "hard-reg-set.h" | |
30 | #include "except.h" | |
31 | #include "function.h" | |
32 | #include "insn-flags.h" | |
33 | #include "insn-codes.h" | |
34 | #include "insn-config.h" | |
35 | #include "expr.h" | |
36 | #include "recog.h" | |
37 | #include "output.h" | |
38 | #include "typeclass.h" | |
39 | #include "defaults.h" | |
40 | #include "toplev.h" | |
41 | ||
42 | #define CALLED_AS_BUILT_IN(NODE) \ | |
43 | (!strncmp (IDENTIFIER_POINTER (DECL_NAME (NODE)), "__builtin_", 10)) | |
44 | ||
45 | #define CEIL(x,y) (((x) + (y) - 1) / (y)) | |
46 | ||
47 | /* Register mappings for target machines without register windows. */ | |
48 | #ifndef INCOMING_REGNO | |
49 | #define INCOMING_REGNO(OUT) (OUT) | |
50 | #endif | |
51 | #ifndef OUTGOING_REGNO | |
52 | #define OUTGOING_REGNO(IN) (IN) | |
53 | #endif | |
54 | ||
55 | /* Nonzero means __builtin_saveregs has already been done in this function. | |
56 | The value is the pseudoreg containing the value __builtin_saveregs | |
57 | returned. */ | |
58 | rtx saveregs_value; | |
59 | ||
60 | /* Similarly for __builtin_apply_args. */ | |
61 | rtx apply_args_value; | |
62 | ||
63 | static int get_pointer_alignment PROTO((tree, unsigned)); | |
64 | static tree c_strlen PROTO((tree)); | |
65 | static rtx get_memory_rtx PROTO((tree)); | |
66 | static int apply_args_size PROTO((void)); | |
67 | static int apply_result_size PROTO((void)); | |
68 | static rtx result_vector PROTO((int, rtx)); | |
69 | static rtx expand_builtin_apply_args PROTO((void)); | |
70 | static rtx expand_builtin_apply_args_1 PROTO((void)); | |
71 | static rtx expand_builtin_apply PROTO((rtx, rtx, rtx)); | |
72 | static void expand_builtin_return PROTO((rtx)); | |
73 | static rtx expand_builtin_classify_type PROTO((tree)); | |
74 | static rtx expand_builtin_mathfn PROTO((tree, rtx, rtx)); | |
75 | static rtx expand_builtin_constant_p PROTO((tree)); | |
76 | static rtx expand_builtin_saveregs PROTO((tree, rtx, int)); | |
77 | static rtx expand_builtin_args_info PROTO((tree)); | |
78 | static rtx expand_builtin_next_arg PROTO((tree)); | |
79 | static rtx expand_builtin_memcmp PROTO((tree, tree, rtx)); | |
80 | static rtx expand_builtin_strcmp PROTO((tree, rtx)); | |
81 | static rtx expand_builtin_memcpy PROTO((tree)); | |
82 | static rtx expand_builtin_strcpy PROTO((tree)); | |
83 | static rtx expand_builtin_memset PROTO((tree)); | |
84 | static rtx expand_builtin_strlen PROTO((tree, rtx, enum machine_mode)); | |
85 | static rtx expand_builtin_alloca PROTO((tree, rtx)); | |
86 | static rtx expand_builtin_ffs PROTO((tree, rtx, rtx)); | |
87 | static rtx expand_builtin_frame_address PROTO((tree)); | |
88 | ||
89 | /* Return the alignment in bits of EXP, a pointer valued expression. | |
90 | But don't return more than MAX_ALIGN no matter what. | |
91 | The alignment returned is, by default, the alignment of the thing that | |
92 | EXP points to (if it is not a POINTER_TYPE, 0 is returned). | |
93 | ||
94 | Otherwise, look at the expression to see if we can do better, i.e., if the | |
95 | expression is actually pointing at an object whose alignment is tighter. */ | |
96 | ||
97 | static int | |
98 | get_pointer_alignment (exp, max_align) | |
99 | tree exp; | |
100 | unsigned max_align; | |
101 | { | |
102 | unsigned align, inner; | |
103 | ||
104 | if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE) | |
105 | return 0; | |
106 | ||
107 | align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp))); | |
108 | align = MIN (align, max_align); | |
109 | ||
110 | while (1) | |
111 | { | |
112 | switch (TREE_CODE (exp)) | |
113 | { | |
114 | case NOP_EXPR: | |
115 | case CONVERT_EXPR: | |
116 | case NON_LVALUE_EXPR: | |
117 | exp = TREE_OPERAND (exp, 0); | |
118 | if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE) | |
119 | return align; | |
120 | inner = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp))); | |
121 | align = MIN (inner, max_align); | |
122 | break; | |
123 | ||
124 | case PLUS_EXPR: | |
125 | /* If sum of pointer + int, restrict our maximum alignment to that | |
126 | imposed by the integer. If not, we can't do any better than | |
127 | ALIGN. */ | |
128 | if (TREE_CODE (TREE_OPERAND (exp, 1)) != INTEGER_CST) | |
129 | return align; | |
130 | ||
131 | while (((TREE_INT_CST_LOW (TREE_OPERAND (exp, 1)) * BITS_PER_UNIT) | |
132 | & (max_align - 1)) | |
133 | != 0) | |
134 | max_align >>= 1; | |
135 | ||
136 | exp = TREE_OPERAND (exp, 0); | |
137 | break; | |
138 | ||
139 | case ADDR_EXPR: | |
140 | /* See what we are pointing at and look at its alignment. */ | |
141 | exp = TREE_OPERAND (exp, 0); | |
142 | if (TREE_CODE (exp) == FUNCTION_DECL) | |
143 | align = FUNCTION_BOUNDARY; | |
144 | else if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'd') | |
145 | align = DECL_ALIGN (exp); | |
146 | #ifdef CONSTANT_ALIGNMENT | |
147 | else if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'c') | |
148 | align = CONSTANT_ALIGNMENT (exp, align); | |
149 | #endif | |
150 | return MIN (align, max_align); | |
151 | ||
152 | default: | |
153 | return align; | |
154 | } | |
155 | } | |
156 | } | |
157 | ||
158 | /* Compute the length of a C string. TREE_STRING_LENGTH is not the right | |
159 | way, because it could contain a zero byte in the middle. | |
160 | TREE_STRING_LENGTH is the size of the character array, not the string. | |
161 | ||
162 | Unfortunately, string_constant can't access the values of const char | |
163 | arrays with initializers, so neither can we do so here. */ | |
164 | ||
165 | static tree | |
166 | c_strlen (src) | |
167 | tree src; | |
168 | { | |
169 | tree offset_node; | |
170 | int offset, max; | |
171 | char *ptr; | |
172 | ||
173 | src = string_constant (src, &offset_node); | |
174 | if (src == 0) | |
175 | return 0; | |
176 | max = TREE_STRING_LENGTH (src); | |
177 | ptr = TREE_STRING_POINTER (src); | |
178 | if (offset_node && TREE_CODE (offset_node) != INTEGER_CST) | |
179 | { | |
180 | /* If the string has an internal zero byte (e.g., "foo\0bar"), we can't | |
181 | compute the offset to the following null if we don't know where to | |
182 | start searching for it. */ | |
183 | int i; | |
184 | for (i = 0; i < max; i++) | |
185 | if (ptr[i] == 0) | |
186 | return 0; | |
187 | /* We don't know the starting offset, but we do know that the string | |
188 | has no internal zero bytes. We can assume that the offset falls | |
189 | within the bounds of the string; otherwise, the programmer deserves | |
190 | what he gets. Subtract the offset from the length of the string, | |
191 | and return that. */ | |
192 | /* This would perhaps not be valid if we were dealing with named | |
193 | arrays in addition to literal string constants. */ | |
194 | return size_binop (MINUS_EXPR, size_int (max), offset_node); | |
195 | } | |
196 | ||
197 | /* We have a known offset into the string. Start searching there for | |
198 | a null character. */ | |
199 | if (offset_node == 0) | |
200 | offset = 0; | |
201 | else | |
202 | { | |
203 | /* Did we get a long long offset? If so, punt. */ | |
204 | if (TREE_INT_CST_HIGH (offset_node) != 0) | |
205 | return 0; | |
206 | offset = TREE_INT_CST_LOW (offset_node); | |
207 | } | |
208 | /* If the offset is known to be out of bounds, warn, and call strlen at | |
209 | runtime. */ | |
210 | if (offset < 0 || offset > max) | |
211 | { | |
212 | warning ("offset outside bounds of constant string"); | |
213 | return 0; | |
214 | } | |
215 | /* Use strlen to search for the first zero byte. Since any strings | |
216 | constructed with build_string will have nulls appended, we win even | |
217 | if we get handed something like (char[4])"abcd". | |
218 | ||
219 | Since OFFSET is our starting index into the string, no further | |
220 | calculation is needed. */ | |
221 | return size_int (strlen (ptr + offset)); | |
222 | } | |
223 | ||
224 | /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT | |
225 | times to get the address of either a higher stack frame, or a return | |
226 | address located within it (depending on FNDECL_CODE). */ | |
227 | rtx | |
228 | expand_builtin_return_addr (fndecl_code, count, tem) | |
229 | enum built_in_function fndecl_code; | |
230 | int count; | |
231 | rtx tem; | |
232 | { | |
233 | int i; | |
234 | ||
235 | /* Some machines need special handling before we can access | |
236 | arbitrary frames. For example, on the sparc, we must first flush | |
237 | all register windows to the stack. */ | |
238 | #ifdef SETUP_FRAME_ADDRESSES | |
239 | if (count > 0) | |
240 | SETUP_FRAME_ADDRESSES (); | |
241 | #endif | |
242 | ||
243 | /* On the sparc, the return address is not in the frame, it is in a | |
244 | register. There is no way to access it off of the current frame | |
245 | pointer, but it can be accessed off the previous frame pointer by | |
246 | reading the value from the register window save area. */ | |
247 | #ifdef RETURN_ADDR_IN_PREVIOUS_FRAME | |
248 | if (fndecl_code == BUILT_IN_RETURN_ADDRESS) | |
249 | count--; | |
250 | #endif | |
251 | ||
252 | /* Scan back COUNT frames to the specified frame. */ | |
253 | for (i = 0; i < count; i++) | |
254 | { | |
255 | /* Assume the dynamic chain pointer is in the word that the | |
256 | frame address points to, unless otherwise specified. */ | |
257 | #ifdef DYNAMIC_CHAIN_ADDRESS | |
258 | tem = DYNAMIC_CHAIN_ADDRESS (tem); | |
259 | #endif | |
260 | tem = memory_address (Pmode, tem); | |
261 | tem = copy_to_reg (gen_rtx_MEM (Pmode, tem)); | |
262 | } | |
263 | ||
264 | /* For __builtin_frame_address, return what we've got. */ | |
265 | if (fndecl_code == BUILT_IN_FRAME_ADDRESS) | |
266 | return tem; | |
267 | ||
268 | /* For __builtin_return_address, Get the return address from that | |
269 | frame. */ | |
270 | #ifdef RETURN_ADDR_RTX | |
271 | tem = RETURN_ADDR_RTX (count, tem); | |
272 | #else | |
273 | tem = memory_address (Pmode, | |
274 | plus_constant (tem, GET_MODE_SIZE (Pmode))); | |
275 | tem = gen_rtx_MEM (Pmode, tem); | |
276 | #endif | |
277 | return tem; | |
278 | } | |
279 | ||
280 | /* __builtin_setjmp is passed a pointer to an array of five words (not | |
281 | all will be used on all machines). It operates similarly to the C | |
282 | library function of the same name, but is more efficient. Much of | |
283 | the code below (and for longjmp) is copied from the handling of | |
284 | non-local gotos. | |
285 | ||
286 | NOTE: This is intended for use by GNAT and the exception handling | |
287 | scheme in the compiler and will only work in the method used by | |
288 | them. */ | |
289 | ||
290 | rtx | |
291 | expand_builtin_setjmp (buf_addr, target, first_label, next_label) | |
292 | rtx buf_addr; | |
293 | rtx target; | |
294 | rtx first_label, next_label; | |
295 | { | |
296 | rtx lab1 = gen_label_rtx (); | |
297 | enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL); | |
298 | enum machine_mode value_mode; | |
299 | rtx stack_save; | |
300 | ||
301 | value_mode = TYPE_MODE (integer_type_node); | |
302 | ||
303 | #ifdef POINTERS_EXTEND_UNSIGNED | |
304 | buf_addr = convert_memory_address (Pmode, buf_addr); | |
305 | #endif | |
306 | ||
307 | buf_addr = force_reg (Pmode, buf_addr); | |
308 | ||
309 | if (target == 0 || GET_CODE (target) != REG | |
310 | || REGNO (target) < FIRST_PSEUDO_REGISTER) | |
311 | target = gen_reg_rtx (value_mode); | |
312 | ||
313 | emit_queue (); | |
314 | ||
315 | /* We store the frame pointer and the address of lab1 in the buffer | |
316 | and use the rest of it for the stack save area, which is | |
317 | machine-dependent. */ | |
318 | ||
319 | #ifndef BUILTIN_SETJMP_FRAME_VALUE | |
320 | #define BUILTIN_SETJMP_FRAME_VALUE virtual_stack_vars_rtx | |
321 | #endif | |
322 | ||
323 | emit_move_insn (gen_rtx_MEM (Pmode, buf_addr), | |
324 | BUILTIN_SETJMP_FRAME_VALUE); | |
325 | emit_move_insn (validize_mem | |
326 | (gen_rtx_MEM (Pmode, | |
327 | plus_constant (buf_addr, | |
328 | GET_MODE_SIZE (Pmode)))), | |
329 | force_reg (Pmode, gen_rtx_LABEL_REF (Pmode, lab1))); | |
330 | ||
331 | stack_save = gen_rtx_MEM (sa_mode, | |
332 | plus_constant (buf_addr, | |
333 | 2 * GET_MODE_SIZE (Pmode))); | |
334 | emit_stack_save (SAVE_NONLOCAL, &stack_save, NULL_RTX); | |
335 | ||
336 | /* If there is further processing to do, do it. */ | |
337 | #ifdef HAVE_builtin_setjmp_setup | |
338 | if (HAVE_builtin_setjmp_setup) | |
339 | emit_insn (gen_builtin_setjmp_setup (buf_addr)); | |
340 | #endif | |
341 | ||
342 | /* Set TARGET to zero and branch to the first-time-through label. */ | |
343 | emit_move_insn (target, const0_rtx); | |
344 | emit_jump_insn (gen_jump (first_label)); | |
345 | emit_barrier (); | |
346 | emit_label (lab1); | |
347 | ||
348 | /* Tell flow about the strange goings on. Putting `lab1' on | |
349 | `nonlocal_goto_handler_labels' to indicates that function | |
350 | calls may traverse the arc back to this label. */ | |
351 | ||
352 | current_function_has_nonlocal_label = 1; | |
353 | nonlocal_goto_handler_labels = | |
354 | gen_rtx_EXPR_LIST (VOIDmode, lab1, nonlocal_goto_handler_labels); | |
355 | ||
356 | /* Clobber the FP when we get here, so we have to make sure it's | |
357 | marked as used by this function. */ | |
358 | emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx)); | |
359 | ||
360 | /* Mark the static chain as clobbered here so life information | |
361 | doesn't get messed up for it. */ | |
362 | emit_insn (gen_rtx_CLOBBER (VOIDmode, static_chain_rtx)); | |
363 | ||
364 | /* Now put in the code to restore the frame pointer, and argument | |
365 | pointer, if needed. The code below is from expand_end_bindings | |
366 | in stmt.c; see detailed documentation there. */ | |
367 | #ifdef HAVE_nonlocal_goto | |
368 | if (! HAVE_nonlocal_goto) | |
369 | #endif | |
370 | emit_move_insn (virtual_stack_vars_rtx, hard_frame_pointer_rtx); | |
371 | ||
372 | #if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM | |
373 | if (fixed_regs[ARG_POINTER_REGNUM]) | |
374 | { | |
375 | #ifdef ELIMINABLE_REGS | |
376 | size_t i; | |
377 | static struct elims {int from, to;} elim_regs[] = ELIMINABLE_REGS; | |
378 | ||
379 | for (i = 0; i < sizeof elim_regs / sizeof elim_regs[0]; i++) | |
380 | if (elim_regs[i].from == ARG_POINTER_REGNUM | |
381 | && elim_regs[i].to == HARD_FRAME_POINTER_REGNUM) | |
382 | break; | |
383 | ||
384 | if (i == sizeof elim_regs / sizeof elim_regs [0]) | |
385 | #endif | |
386 | { | |
387 | /* Now restore our arg pointer from the address at which it | |
388 | was saved in our stack frame. | |
389 | If there hasn't be space allocated for it yet, make | |
390 | some now. */ | |
391 | if (arg_pointer_save_area == 0) | |
392 | arg_pointer_save_area | |
393 | = assign_stack_local (Pmode, GET_MODE_SIZE (Pmode), 0); | |
394 | emit_move_insn (virtual_incoming_args_rtx, | |
395 | copy_to_reg (arg_pointer_save_area)); | |
396 | } | |
397 | } | |
398 | #endif | |
399 | ||
400 | #ifdef HAVE_builtin_setjmp_receiver | |
401 | if (HAVE_builtin_setjmp_receiver) | |
402 | emit_insn (gen_builtin_setjmp_receiver (lab1)); | |
403 | else | |
404 | #endif | |
405 | #ifdef HAVE_nonlocal_goto_receiver | |
406 | if (HAVE_nonlocal_goto_receiver) | |
407 | emit_insn (gen_nonlocal_goto_receiver ()); | |
408 | else | |
409 | #endif | |
410 | { | |
411 | ; /* Nothing */ | |
412 | } | |
413 | ||
414 | /* Set TARGET, and branch to the next-time-through label. */ | |
415 | emit_move_insn (target, const1_rtx); | |
416 | emit_jump_insn (gen_jump (next_label)); | |
417 | emit_barrier (); | |
418 | ||
419 | return target; | |
420 | } | |
421 | ||
422 | /* __builtin_longjmp is passed a pointer to an array of five words (not | |
423 | all will be used on all machines). It operates similarly to the C | |
424 | library function of the same name, but is more efficient. Much of | |
425 | the code below is copied from the handling of non-local gotos. | |
426 | ||
427 | NOTE: This is intended for use by GNAT and the exception handling | |
428 | scheme in the compiler and will only work in the method used by | |
429 | them. */ | |
430 | ||
431 | void | |
432 | expand_builtin_longjmp (buf_addr, value) | |
433 | rtx buf_addr, value; | |
434 | { | |
435 | rtx fp, lab, stack; | |
436 | enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL); | |
437 | ||
438 | #ifdef POINTERS_EXTEND_UNSIGNED | |
439 | buf_addr = convert_memory_address (Pmode, buf_addr); | |
440 | #endif | |
441 | buf_addr = force_reg (Pmode, buf_addr); | |
442 | ||
443 | /* We used to store value in static_chain_rtx, but that fails if pointers | |
444 | are smaller than integers. We instead require that the user must pass | |
445 | a second argument of 1, because that is what builtin_setjmp will | |
446 | return. This also makes EH slightly more efficient, since we are no | |
447 | longer copying around a value that we don't care about. */ | |
448 | if (value != const1_rtx) | |
449 | abort (); | |
450 | ||
451 | #ifdef HAVE_builtin_longjmp | |
452 | if (HAVE_builtin_longjmp) | |
453 | emit_insn (gen_builtin_longjmp (buf_addr)); | |
454 | else | |
455 | #endif | |
456 | { | |
457 | fp = gen_rtx_MEM (Pmode, buf_addr); | |
458 | lab = gen_rtx_MEM (Pmode, plus_constant (buf_addr, | |
459 | GET_MODE_SIZE (Pmode))); | |
460 | ||
461 | stack = gen_rtx_MEM (sa_mode, plus_constant (buf_addr, | |
462 | 2 * GET_MODE_SIZE (Pmode))); | |
463 | ||
464 | /* Pick up FP, label, and SP from the block and jump. This code is | |
465 | from expand_goto in stmt.c; see there for detailed comments. */ | |
466 | #if HAVE_nonlocal_goto | |
467 | if (HAVE_nonlocal_goto) | |
468 | /* We have to pass a value to the nonlocal_goto pattern that will | |
469 | get copied into the static_chain pointer, but it does not matter | |
470 | what that value is, because builtin_setjmp does not use it. */ | |
471 | emit_insn (gen_nonlocal_goto (value, fp, stack, lab)); | |
472 | else | |
473 | #endif | |
474 | { | |
475 | lab = copy_to_reg (lab); | |
476 | ||
477 | emit_move_insn (hard_frame_pointer_rtx, fp); | |
478 | emit_stack_restore (SAVE_NONLOCAL, stack, NULL_RTX); | |
479 | ||
480 | emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx)); | |
481 | emit_insn (gen_rtx_USE (VOIDmode, stack_pointer_rtx)); | |
482 | emit_indirect_jump (lab); | |
483 | } | |
484 | } | |
485 | } | |
486 | ||
487 | /* Get a MEM rtx for expression EXP which can be used in a string instruction | |
488 | (cmpstrsi, movstrsi, ..). */ | |
489 | static rtx | |
490 | get_memory_rtx (exp) | |
491 | tree exp; | |
492 | { | |
493 | rtx mem; | |
494 | int is_aggregate; | |
495 | ||
496 | mem = gen_rtx_MEM (BLKmode, | |
497 | memory_address (BLKmode, | |
498 | expand_expr (exp, NULL_RTX, | |
499 | ptr_mode, EXPAND_SUM))); | |
500 | ||
501 | RTX_UNCHANGING_P (mem) = TREE_READONLY (exp); | |
502 | ||
503 | /* Figure out the type of the object pointed to. Set MEM_IN_STRUCT_P | |
504 | if the value is the address of a structure or if the expression is | |
505 | cast to a pointer to structure type. */ | |
506 | is_aggregate = 0; | |
507 | ||
508 | while (TREE_CODE (exp) == NOP_EXPR) | |
509 | { | |
510 | tree cast_type = TREE_TYPE (exp); | |
511 | if (TREE_CODE (cast_type) == POINTER_TYPE | |
512 | && AGGREGATE_TYPE_P (TREE_TYPE (cast_type))) | |
513 | { | |
514 | is_aggregate = 1; | |
515 | break; | |
516 | } | |
517 | exp = TREE_OPERAND (exp, 0); | |
518 | } | |
519 | ||
520 | if (is_aggregate == 0) | |
521 | { | |
522 | tree type; | |
523 | ||
524 | if (TREE_CODE (exp) == ADDR_EXPR) | |
525 | /* If this is the address of an object, check whether the | |
526 | object is an array. */ | |
527 | type = TREE_TYPE (TREE_OPERAND (exp, 0)); | |
528 | else | |
529 | type = TREE_TYPE (TREE_TYPE (exp)); | |
530 | is_aggregate = AGGREGATE_TYPE_P (type); | |
531 | } | |
532 | ||
533 | MEM_SET_IN_STRUCT_P (mem, is_aggregate); | |
534 | return mem; | |
535 | } | |
536 | \f | |
537 | /* Built-in functions to perform an untyped call and return. */ | |
538 | ||
539 | /* For each register that may be used for calling a function, this | |
540 | gives a mode used to copy the register's value. VOIDmode indicates | |
541 | the register is not used for calling a function. If the machine | |
542 | has register windows, this gives only the outbound registers. | |
543 | INCOMING_REGNO gives the corresponding inbound register. */ | |
544 | static enum machine_mode apply_args_mode[FIRST_PSEUDO_REGISTER]; | |
545 | ||
546 | /* For each register that may be used for returning values, this gives | |
547 | a mode used to copy the register's value. VOIDmode indicates the | |
548 | register is not used for returning values. If the machine has | |
549 | register windows, this gives only the outbound registers. | |
550 | INCOMING_REGNO gives the corresponding inbound register. */ | |
551 | static enum machine_mode apply_result_mode[FIRST_PSEUDO_REGISTER]; | |
552 | ||
553 | /* For each register that may be used for calling a function, this | |
554 | gives the offset of that register into the block returned by | |
555 | __builtin_apply_args. 0 indicates that the register is not | |
556 | used for calling a function. */ | |
557 | static int apply_args_reg_offset[FIRST_PSEUDO_REGISTER]; | |
558 | ||
559 | /* Return the offset of register REGNO into the block returned by | |
560 | __builtin_apply_args. This is not declared static, since it is | |
561 | needed in objc-act.c. */ | |
562 | ||
563 | int | |
564 | apply_args_register_offset (regno) | |
565 | int regno; | |
566 | { | |
567 | apply_args_size (); | |
568 | ||
569 | /* Arguments are always put in outgoing registers (in the argument | |
570 | block) if such make sense. */ | |
571 | #ifdef OUTGOING_REGNO | |
572 | regno = OUTGOING_REGNO(regno); | |
573 | #endif | |
574 | return apply_args_reg_offset[regno]; | |
575 | } | |
576 | ||
577 | /* Return the size required for the block returned by __builtin_apply_args, | |
578 | and initialize apply_args_mode. */ | |
579 | ||
580 | static int | |
581 | apply_args_size () | |
582 | { | |
583 | static int size = -1; | |
584 | int align, regno; | |
585 | enum machine_mode mode; | |
586 | ||
587 | /* The values computed by this function never change. */ | |
588 | if (size < 0) | |
589 | { | |
590 | /* The first value is the incoming arg-pointer. */ | |
591 | size = GET_MODE_SIZE (Pmode); | |
592 | ||
593 | /* The second value is the structure value address unless this is | |
594 | passed as an "invisible" first argument. */ | |
595 | if (struct_value_rtx) | |
596 | size += GET_MODE_SIZE (Pmode); | |
597 | ||
598 | for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) | |
599 | if (FUNCTION_ARG_REGNO_P (regno)) | |
600 | { | |
601 | /* Search for the proper mode for copying this register's | |
602 | value. I'm not sure this is right, but it works so far. */ | |
603 | enum machine_mode best_mode = VOIDmode; | |
604 | ||
605 | for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); | |
606 | mode != VOIDmode; | |
607 | mode = GET_MODE_WIDER_MODE (mode)) | |
608 | if (HARD_REGNO_MODE_OK (regno, mode) | |
609 | && HARD_REGNO_NREGS (regno, mode) == 1) | |
610 | best_mode = mode; | |
611 | ||
612 | if (best_mode == VOIDmode) | |
613 | for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); | |
614 | mode != VOIDmode; | |
615 | mode = GET_MODE_WIDER_MODE (mode)) | |
616 | if (HARD_REGNO_MODE_OK (regno, mode) | |
617 | && (mov_optab->handlers[(int) mode].insn_code | |
618 | != CODE_FOR_nothing)) | |
619 | best_mode = mode; | |
620 | ||
621 | mode = best_mode; | |
622 | if (mode == VOIDmode) | |
623 | abort (); | |
624 | ||
625 | align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT; | |
626 | if (size % align != 0) | |
627 | size = CEIL (size, align) * align; | |
628 | apply_args_reg_offset[regno] = size; | |
629 | size += GET_MODE_SIZE (mode); | |
630 | apply_args_mode[regno] = mode; | |
631 | } | |
632 | else | |
633 | { | |
634 | apply_args_mode[regno] = VOIDmode; | |
635 | apply_args_reg_offset[regno] = 0; | |
636 | } | |
637 | } | |
638 | return size; | |
639 | } | |
640 | ||
641 | /* Return the size required for the block returned by __builtin_apply, | |
642 | and initialize apply_result_mode. */ | |
643 | ||
644 | static int | |
645 | apply_result_size () | |
646 | { | |
647 | static int size = -1; | |
648 | int align, regno; | |
649 | enum machine_mode mode; | |
650 | ||
651 | /* The values computed by this function never change. */ | |
652 | if (size < 0) | |
653 | { | |
654 | size = 0; | |
655 | ||
656 | for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) | |
657 | if (FUNCTION_VALUE_REGNO_P (regno)) | |
658 | { | |
659 | /* Search for the proper mode for copying this register's | |
660 | value. I'm not sure this is right, but it works so far. */ | |
661 | enum machine_mode best_mode = VOIDmode; | |
662 | ||
663 | for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT); | |
664 | mode != TImode; | |
665 | mode = GET_MODE_WIDER_MODE (mode)) | |
666 | if (HARD_REGNO_MODE_OK (regno, mode)) | |
667 | best_mode = mode; | |
668 | ||
669 | if (best_mode == VOIDmode) | |
670 | for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT); | |
671 | mode != VOIDmode; | |
672 | mode = GET_MODE_WIDER_MODE (mode)) | |
673 | if (HARD_REGNO_MODE_OK (regno, mode) | |
674 | && (mov_optab->handlers[(int) mode].insn_code | |
675 | != CODE_FOR_nothing)) | |
676 | best_mode = mode; | |
677 | ||
678 | mode = best_mode; | |
679 | if (mode == VOIDmode) | |
680 | abort (); | |
681 | ||
682 | align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT; | |
683 | if (size % align != 0) | |
684 | size = CEIL (size, align) * align; | |
685 | size += GET_MODE_SIZE (mode); | |
686 | apply_result_mode[regno] = mode; | |
687 | } | |
688 | else | |
689 | apply_result_mode[regno] = VOIDmode; | |
690 | ||
691 | /* Allow targets that use untyped_call and untyped_return to override | |
692 | the size so that machine-specific information can be stored here. */ | |
693 | #ifdef APPLY_RESULT_SIZE | |
694 | size = APPLY_RESULT_SIZE; | |
695 | #endif | |
696 | } | |
697 | return size; | |
698 | } | |
699 | ||
700 | #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return) | |
701 | /* Create a vector describing the result block RESULT. If SAVEP is true, | |
702 | the result block is used to save the values; otherwise it is used to | |
703 | restore the values. */ | |
704 | ||
705 | static rtx | |
706 | result_vector (savep, result) | |
707 | int savep; | |
708 | rtx result; | |
709 | { | |
710 | int regno, size, align, nelts; | |
711 | enum machine_mode mode; | |
712 | rtx reg, mem; | |
713 | rtx *savevec = (rtx *) alloca (FIRST_PSEUDO_REGISTER * sizeof (rtx)); | |
714 | ||
715 | size = nelts = 0; | |
716 | for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) | |
717 | if ((mode = apply_result_mode[regno]) != VOIDmode) | |
718 | { | |
719 | align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT; | |
720 | if (size % align != 0) | |
721 | size = CEIL (size, align) * align; | |
722 | reg = gen_rtx_REG (mode, savep ? regno : INCOMING_REGNO (regno)); | |
723 | mem = change_address (result, mode, | |
724 | plus_constant (XEXP (result, 0), size)); | |
725 | savevec[nelts++] = (savep | |
726 | ? gen_rtx_SET (VOIDmode, mem, reg) | |
727 | : gen_rtx_SET (VOIDmode, reg, mem)); | |
728 | size += GET_MODE_SIZE (mode); | |
729 | } | |
730 | return gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (nelts, savevec)); | |
731 | } | |
732 | #endif /* HAVE_untyped_call or HAVE_untyped_return */ | |
733 | ||
734 | /* Save the state required to perform an untyped call with the same | |
735 | arguments as were passed to the current function. */ | |
736 | ||
737 | static rtx | |
738 | expand_builtin_apply_args_1 () | |
739 | { | |
740 | rtx registers; | |
741 | int size, align, regno; | |
742 | enum machine_mode mode; | |
743 | ||
744 | /* Create a block where the arg-pointer, structure value address, | |
745 | and argument registers can be saved. */ | |
746 | registers = assign_stack_local (BLKmode, apply_args_size (), -1); | |
747 | ||
748 | /* Walk past the arg-pointer and structure value address. */ | |
749 | size = GET_MODE_SIZE (Pmode); | |
750 | if (struct_value_rtx) | |
751 | size += GET_MODE_SIZE (Pmode); | |
752 | ||
753 | /* Save each register used in calling a function to the block. */ | |
754 | for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) | |
755 | if ((mode = apply_args_mode[regno]) != VOIDmode) | |
756 | { | |
757 | rtx tem; | |
758 | ||
759 | align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT; | |
760 | if (size % align != 0) | |
761 | size = CEIL (size, align) * align; | |
762 | ||
763 | tem = gen_rtx_REG (mode, INCOMING_REGNO (regno)); | |
764 | ||
765 | #ifdef STACK_REGS | |
766 | /* For reg-stack.c's stack register household. | |
767 | Compare with a similar piece of code in function.c. */ | |
768 | ||
769 | emit_insn (gen_rtx_USE (mode, tem)); | |
770 | #endif | |
771 | ||
772 | emit_move_insn (change_address (registers, mode, | |
773 | plus_constant (XEXP (registers, 0), | |
774 | size)), | |
775 | tem); | |
776 | size += GET_MODE_SIZE (mode); | |
777 | } | |
778 | ||
779 | /* Save the arg pointer to the block. */ | |
780 | emit_move_insn (change_address (registers, Pmode, XEXP (registers, 0)), | |
781 | copy_to_reg (virtual_incoming_args_rtx)); | |
782 | size = GET_MODE_SIZE (Pmode); | |
783 | ||
784 | /* Save the structure value address unless this is passed as an | |
785 | "invisible" first argument. */ | |
786 | if (struct_value_incoming_rtx) | |
787 | { | |
788 | emit_move_insn (change_address (registers, Pmode, | |
789 | plus_constant (XEXP (registers, 0), | |
790 | size)), | |
791 | copy_to_reg (struct_value_incoming_rtx)); | |
792 | size += GET_MODE_SIZE (Pmode); | |
793 | } | |
794 | ||
795 | /* Return the address of the block. */ | |
796 | return copy_addr_to_reg (XEXP (registers, 0)); | |
797 | } | |
798 | ||
799 | /* __builtin_apply_args returns block of memory allocated on | |
800 | the stack into which is stored the arg pointer, structure | |
801 | value address, static chain, and all the registers that might | |
802 | possibly be used in performing a function call. The code is | |
803 | moved to the start of the function so the incoming values are | |
804 | saved. */ | |
805 | static rtx | |
806 | expand_builtin_apply_args () | |
807 | { | |
808 | /* Don't do __builtin_apply_args more than once in a function. | |
809 | Save the result of the first call and reuse it. */ | |
810 | if (apply_args_value != 0) | |
811 | return apply_args_value; | |
812 | { | |
813 | /* When this function is called, it means that registers must be | |
814 | saved on entry to this function. So we migrate the | |
815 | call to the first insn of this function. */ | |
816 | rtx temp; | |
817 | rtx seq; | |
818 | ||
819 | start_sequence (); | |
820 | temp = expand_builtin_apply_args_1 (); | |
821 | seq = get_insns (); | |
822 | end_sequence (); | |
823 | ||
824 | apply_args_value = temp; | |
825 | ||
826 | /* Put the sequence after the NOTE that starts the function. | |
827 | If this is inside a SEQUENCE, make the outer-level insn | |
828 | chain current, so the code is placed at the start of the | |
829 | function. */ | |
830 | push_topmost_sequence (); | |
831 | emit_insns_before (seq, NEXT_INSN (get_insns ())); | |
832 | pop_topmost_sequence (); | |
833 | return temp; | |
834 | } | |
835 | } | |
836 | ||
837 | /* Perform an untyped call and save the state required to perform an | |
838 | untyped return of whatever value was returned by the given function. */ | |
839 | ||
840 | static rtx | |
841 | expand_builtin_apply (function, arguments, argsize) | |
842 | rtx function, arguments, argsize; | |
843 | { | |
844 | int size, align, regno; | |
845 | enum machine_mode mode; | |
846 | rtx incoming_args, result, reg, dest, call_insn; | |
847 | rtx old_stack_level = 0; | |
848 | rtx call_fusage = 0; | |
849 | ||
850 | /* Create a block where the return registers can be saved. */ | |
851 | result = assign_stack_local (BLKmode, apply_result_size (), -1); | |
852 | ||
853 | /* ??? The argsize value should be adjusted here. */ | |
854 | ||
855 | /* Fetch the arg pointer from the ARGUMENTS block. */ | |
856 | incoming_args = gen_reg_rtx (Pmode); | |
857 | emit_move_insn (incoming_args, | |
858 | gen_rtx_MEM (Pmode, arguments)); | |
859 | #ifndef STACK_GROWS_DOWNWARD | |
860 | incoming_args = expand_binop (Pmode, sub_optab, incoming_args, argsize, | |
861 | incoming_args, 0, OPTAB_LIB_WIDEN); | |
862 | #endif | |
863 | ||
864 | /* Perform postincrements before actually calling the function. */ | |
865 | emit_queue (); | |
866 | ||
867 | /* Push a new argument block and copy the arguments. */ | |
868 | do_pending_stack_adjust (); | |
869 | ||
870 | /* Save the stack with nonlocal if available */ | |
871 | #ifdef HAVE_save_stack_nonlocal | |
872 | if (HAVE_save_stack_nonlocal) | |
873 | emit_stack_save (SAVE_NONLOCAL, &old_stack_level, NULL_RTX); | |
874 | else | |
875 | #endif | |
876 | emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX); | |
877 | ||
878 | /* Push a block of memory onto the stack to store the memory arguments. | |
879 | Save the address in a register, and copy the memory arguments. ??? I | |
880 | haven't figured out how the calling convention macros effect this, | |
881 | but it's likely that the source and/or destination addresses in | |
882 | the block copy will need updating in machine specific ways. */ | |
883 | dest = allocate_dynamic_stack_space (argsize, 0, 0); | |
884 | emit_block_move (gen_rtx_MEM (BLKmode, dest), | |
885 | gen_rtx_MEM (BLKmode, incoming_args), | |
886 | argsize, | |
887 | PARM_BOUNDARY / BITS_PER_UNIT); | |
888 | ||
889 | /* Refer to the argument block. */ | |
890 | apply_args_size (); | |
891 | arguments = gen_rtx_MEM (BLKmode, arguments); | |
892 | ||
893 | /* Walk past the arg-pointer and structure value address. */ | |
894 | size = GET_MODE_SIZE (Pmode); | |
895 | if (struct_value_rtx) | |
896 | size += GET_MODE_SIZE (Pmode); | |
897 | ||
898 | /* Restore each of the registers previously saved. Make USE insns | |
899 | for each of these registers for use in making the call. */ | |
900 | for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) | |
901 | if ((mode = apply_args_mode[regno]) != VOIDmode) | |
902 | { | |
903 | align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT; | |
904 | if (size % align != 0) | |
905 | size = CEIL (size, align) * align; | |
906 | reg = gen_rtx_REG (mode, regno); | |
907 | emit_move_insn (reg, | |
908 | change_address (arguments, mode, | |
909 | plus_constant (XEXP (arguments, 0), | |
910 | size))); | |
911 | ||
912 | use_reg (&call_fusage, reg); | |
913 | size += GET_MODE_SIZE (mode); | |
914 | } | |
915 | ||
916 | /* Restore the structure value address unless this is passed as an | |
917 | "invisible" first argument. */ | |
918 | size = GET_MODE_SIZE (Pmode); | |
919 | if (struct_value_rtx) | |
920 | { | |
921 | rtx value = gen_reg_rtx (Pmode); | |
922 | emit_move_insn (value, | |
923 | change_address (arguments, Pmode, | |
924 | plus_constant (XEXP (arguments, 0), | |
925 | size))); | |
926 | emit_move_insn (struct_value_rtx, value); | |
927 | if (GET_CODE (struct_value_rtx) == REG) | |
928 | use_reg (&call_fusage, struct_value_rtx); | |
929 | size += GET_MODE_SIZE (Pmode); | |
930 | } | |
931 | ||
932 | /* All arguments and registers used for the call are set up by now! */ | |
933 | function = prepare_call_address (function, NULL_TREE, &call_fusage, 0); | |
934 | ||
935 | /* Ensure address is valid. SYMBOL_REF is already valid, so no need, | |
936 | and we don't want to load it into a register as an optimization, | |
937 | because prepare_call_address already did it if it should be done. */ | |
938 | if (GET_CODE (function) != SYMBOL_REF) | |
939 | function = memory_address (FUNCTION_MODE, function); | |
940 | ||
941 | /* Generate the actual call instruction and save the return value. */ | |
942 | #ifdef HAVE_untyped_call | |
943 | if (HAVE_untyped_call) | |
944 | emit_call_insn (gen_untyped_call (gen_rtx_MEM (FUNCTION_MODE, function), | |
945 | result, result_vector (1, result))); | |
946 | else | |
947 | #endif | |
948 | #ifdef HAVE_call_value | |
949 | if (HAVE_call_value) | |
950 | { | |
951 | rtx valreg = 0; | |
952 | ||
953 | /* Locate the unique return register. It is not possible to | |
954 | express a call that sets more than one return register using | |
955 | call_value; use untyped_call for that. In fact, untyped_call | |
956 | only needs to save the return registers in the given block. */ | |
957 | for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) | |
958 | if ((mode = apply_result_mode[regno]) != VOIDmode) | |
959 | { | |
960 | if (valreg) | |
961 | abort (); /* HAVE_untyped_call required. */ | |
962 | valreg = gen_rtx_REG (mode, regno); | |
963 | } | |
964 | ||
965 | emit_call_insn (gen_call_value (valreg, | |
966 | gen_rtx_MEM (FUNCTION_MODE, function), | |
967 | const0_rtx, NULL_RTX, const0_rtx)); | |
968 | ||
969 | emit_move_insn (change_address (result, GET_MODE (valreg), | |
970 | XEXP (result, 0)), | |
971 | valreg); | |
972 | } | |
973 | else | |
974 | #endif | |
975 | abort (); | |
976 | ||
977 | /* Find the CALL insn we just emitted. */ | |
978 | for (call_insn = get_last_insn (); | |
979 | call_insn && GET_CODE (call_insn) != CALL_INSN; | |
980 | call_insn = PREV_INSN (call_insn)) | |
981 | ; | |
982 | ||
983 | if (! call_insn) | |
984 | abort (); | |
985 | ||
986 | /* Put the register usage information on the CALL. If there is already | |
987 | some usage information, put ours at the end. */ | |
988 | if (CALL_INSN_FUNCTION_USAGE (call_insn)) | |
989 | { | |
990 | rtx link; | |
991 | ||
992 | for (link = CALL_INSN_FUNCTION_USAGE (call_insn); XEXP (link, 1) != 0; | |
993 | link = XEXP (link, 1)) | |
994 | ; | |
995 | ||
996 | XEXP (link, 1) = call_fusage; | |
997 | } | |
998 | else | |
999 | CALL_INSN_FUNCTION_USAGE (call_insn) = call_fusage; | |
1000 | ||
1001 | /* Restore the stack. */ | |
1002 | #ifdef HAVE_save_stack_nonlocal | |
1003 | if (HAVE_save_stack_nonlocal) | |
1004 | emit_stack_restore (SAVE_NONLOCAL, old_stack_level, NULL_RTX); | |
1005 | else | |
1006 | #endif | |
1007 | emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX); | |
1008 | ||
1009 | /* Return the address of the result block. */ | |
1010 | return copy_addr_to_reg (XEXP (result, 0)); | |
1011 | } | |
1012 | ||
1013 | /* Perform an untyped return. */ | |
1014 | ||
1015 | static void | |
1016 | expand_builtin_return (result) | |
1017 | rtx result; | |
1018 | { | |
1019 | int size, align, regno; | |
1020 | enum machine_mode mode; | |
1021 | rtx reg; | |
1022 | rtx call_fusage = 0; | |
1023 | ||
1024 | apply_result_size (); | |
1025 | result = gen_rtx_MEM (BLKmode, result); | |
1026 | ||
1027 | #ifdef HAVE_untyped_return | |
1028 | if (HAVE_untyped_return) | |
1029 | { | |
1030 | emit_jump_insn (gen_untyped_return (result, result_vector (0, result))); | |
1031 | emit_barrier (); | |
1032 | return; | |
1033 | } | |
1034 | #endif | |
1035 | ||
1036 | /* Restore the return value and note that each value is used. */ | |
1037 | size = 0; | |
1038 | for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++) | |
1039 | if ((mode = apply_result_mode[regno]) != VOIDmode) | |
1040 | { | |
1041 | align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT; | |
1042 | if (size % align != 0) | |
1043 | size = CEIL (size, align) * align; | |
1044 | reg = gen_rtx_REG (mode, INCOMING_REGNO (regno)); | |
1045 | emit_move_insn (reg, | |
1046 | change_address (result, mode, | |
1047 | plus_constant (XEXP (result, 0), | |
1048 | size))); | |
1049 | ||
1050 | push_to_sequence (call_fusage); | |
1051 | emit_insn (gen_rtx_USE (VOIDmode, reg)); | |
1052 | call_fusage = get_insns (); | |
1053 | end_sequence (); | |
1054 | size += GET_MODE_SIZE (mode); | |
1055 | } | |
1056 | ||
1057 | /* Put the USE insns before the return. */ | |
1058 | emit_insns (call_fusage); | |
1059 | ||
1060 | /* Return whatever values was restored by jumping directly to the end | |
1061 | of the function. */ | |
1062 | expand_null_return (); | |
1063 | } | |
1064 | ||
1065 | /* Expand a call to __builtin_classify_type with arguments found in | |
1066 | ARGLIST. */ | |
1067 | static rtx | |
1068 | expand_builtin_classify_type (arglist) | |
1069 | tree arglist; | |
1070 | { | |
1071 | if (arglist != 0) | |
1072 | { | |
1073 | tree type = TREE_TYPE (TREE_VALUE (arglist)); | |
1074 | enum tree_code code = TREE_CODE (type); | |
1075 | if (code == VOID_TYPE) | |
1076 | return GEN_INT (void_type_class); | |
1077 | if (code == INTEGER_TYPE) | |
1078 | return GEN_INT (integer_type_class); | |
1079 | if (code == CHAR_TYPE) | |
1080 | return GEN_INT (char_type_class); | |
1081 | if (code == ENUMERAL_TYPE) | |
1082 | return GEN_INT (enumeral_type_class); | |
1083 | if (code == BOOLEAN_TYPE) | |
1084 | return GEN_INT (boolean_type_class); | |
1085 | if (code == POINTER_TYPE) | |
1086 | return GEN_INT (pointer_type_class); | |
1087 | if (code == REFERENCE_TYPE) | |
1088 | return GEN_INT (reference_type_class); | |
1089 | if (code == OFFSET_TYPE) | |
1090 | return GEN_INT (offset_type_class); | |
1091 | if (code == REAL_TYPE) | |
1092 | return GEN_INT (real_type_class); | |
1093 | if (code == COMPLEX_TYPE) | |
1094 | return GEN_INT (complex_type_class); | |
1095 | if (code == FUNCTION_TYPE) | |
1096 | return GEN_INT (function_type_class); | |
1097 | if (code == METHOD_TYPE) | |
1098 | return GEN_INT (method_type_class); | |
1099 | if (code == RECORD_TYPE) | |
1100 | return GEN_INT (record_type_class); | |
1101 | if (code == UNION_TYPE || code == QUAL_UNION_TYPE) | |
1102 | return GEN_INT (union_type_class); | |
1103 | if (code == ARRAY_TYPE) | |
1104 | { | |
1105 | if (TYPE_STRING_FLAG (type)) | |
1106 | return GEN_INT (string_type_class); | |
1107 | else | |
1108 | return GEN_INT (array_type_class); | |
1109 | } | |
1110 | if (code == SET_TYPE) | |
1111 | return GEN_INT (set_type_class); | |
1112 | if (code == FILE_TYPE) | |
1113 | return GEN_INT (file_type_class); | |
1114 | if (code == LANG_TYPE) | |
1115 | return GEN_INT (lang_type_class); | |
1116 | } | |
1117 | return GEN_INT (no_type_class); | |
1118 | } | |
1119 | ||
1120 | /* Expand expression EXP, which is a call to __builtin_constant_p. */ | |
1121 | static rtx | |
1122 | expand_builtin_constant_p (exp) | |
1123 | tree exp; | |
1124 | { | |
1125 | tree arglist = TREE_OPERAND (exp, 1); | |
1126 | enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp)); | |
1127 | ||
1128 | if (arglist == 0) | |
1129 | return const0_rtx; | |
1130 | else | |
1131 | { | |
1132 | tree arg = TREE_VALUE (arglist); | |
1133 | rtx tmp; | |
1134 | ||
1135 | /* We return 1 for a numeric type that's known to be a constant | |
1136 | value at compile-time or for an aggregate type that's a | |
1137 | literal constant. */ | |
1138 | STRIP_NOPS (arg); | |
1139 | ||
1140 | /* If we know this is a constant, emit the constant of one. */ | |
1141 | if (TREE_CODE_CLASS (TREE_CODE (arg)) == 'c' | |
1142 | || (TREE_CODE (arg) == CONSTRUCTOR | |
1143 | && TREE_CONSTANT (arg)) | |
1144 | || (TREE_CODE (arg) == ADDR_EXPR | |
1145 | && TREE_CODE (TREE_OPERAND (arg, 0)) == STRING_CST)) | |
1146 | return const1_rtx; | |
1147 | ||
1148 | /* If we aren't going to be running CSE or this expression | |
1149 | has side effects, show we don't know it to be a constant. | |
1150 | Likewise if it's a pointer or aggregate type since in those | |
1151 | case we only want literals, since those are only optimized | |
1152 | when generating RTL, not later. */ | |
1153 | if (TREE_SIDE_EFFECTS (arg) || cse_not_expected | |
1154 | || AGGREGATE_TYPE_P (TREE_TYPE (arg)) | |
1155 | || POINTER_TYPE_P (TREE_TYPE (arg))) | |
1156 | return const0_rtx; | |
1157 | ||
1158 | /* Otherwise, emit (constant_p_rtx (ARG)) and let CSE get a | |
1159 | chance to see if it can deduce whether ARG is constant. */ | |
1160 | ||
1161 | tmp = expand_expr (arg, NULL_RTX, VOIDmode, 0); | |
1162 | tmp = gen_rtx_CONSTANT_P_RTX (value_mode, tmp); | |
1163 | return tmp; | |
1164 | } | |
1165 | } | |
1166 | ||
1167 | /* Expand a call to one of the builtin math functions (sin, cos, or sqrt). | |
1168 | Return 0 if a normal call should be emitted rather than expanding the | |
1169 | function in-line. EXP is the expression that is a call to the builtin | |
1170 | function; if convenient, the result should be placed in TARGET. | |
1171 | SUBTARGET may be used as the target for computing one of EXP's operands. */ | |
1172 | static rtx | |
1173 | expand_builtin_mathfn (exp, target, subtarget) | |
1174 | tree exp; | |
1175 | rtx target, subtarget; | |
1176 | { | |
1177 | optab builtin_optab; | |
1178 | rtx op0, insns; | |
1179 | tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0); | |
1180 | tree arglist = TREE_OPERAND (exp, 1); | |
1181 | ||
1182 | if (arglist == 0 | |
1183 | /* Arg could be wrong type if user redeclared this fcn wrong. */ | |
1184 | || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != REAL_TYPE) | |
1185 | return 0; | |
1186 | ||
1187 | /* Stabilize and compute the argument. */ | |
1188 | if (TREE_CODE (TREE_VALUE (arglist)) != VAR_DECL | |
1189 | && TREE_CODE (TREE_VALUE (arglist)) != PARM_DECL) | |
1190 | { | |
1191 | exp = copy_node (exp); | |
1192 | arglist = copy_node (arglist); | |
1193 | TREE_OPERAND (exp, 1) = arglist; | |
1194 | TREE_VALUE (arglist) = save_expr (TREE_VALUE (arglist)); | |
1195 | } | |
1196 | op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0); | |
1197 | ||
1198 | /* Make a suitable register to place result in. */ | |
1199 | target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp))); | |
1200 | ||
1201 | emit_queue (); | |
1202 | start_sequence (); | |
1203 | ||
1204 | switch (DECL_FUNCTION_CODE (fndecl)) | |
1205 | { | |
1206 | case BUILT_IN_SIN: | |
1207 | builtin_optab = sin_optab; break; | |
1208 | case BUILT_IN_COS: | |
1209 | builtin_optab = cos_optab; break; | |
1210 | case BUILT_IN_FSQRT: | |
1211 | builtin_optab = sqrt_optab; break; | |
1212 | default: | |
1213 | abort (); | |
1214 | } | |
1215 | ||
1216 | /* Compute into TARGET. | |
1217 | Set TARGET to wherever the result comes back. */ | |
1218 | target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))), | |
1219 | builtin_optab, op0, target, 0); | |
1220 | ||
1221 | /* If we were unable to expand via the builtin, stop the | |
1222 | sequence (without outputting the insns) and return 0, causing | |
1223 | a call to the library function. */ | |
1224 | if (target == 0) | |
1225 | { | |
1226 | end_sequence (); | |
1227 | return 0; | |
1228 | } | |
1229 | ||
1230 | /* Check the results by default. But if flag_fast_math is turned on, | |
1231 | then assume sqrt will always be called with valid arguments. */ | |
1232 | ||
1233 | if (flag_errno_math && ! flag_fast_math) | |
1234 | { | |
1235 | rtx lab1; | |
1236 | ||
1237 | /* Don't define the builtin FP instructions | |
1238 | if your machine is not IEEE. */ | |
1239 | if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT) | |
1240 | abort (); | |
1241 | ||
1242 | lab1 = gen_label_rtx (); | |
1243 | ||
1244 | /* Test the result; if it is NaN, set errno=EDOM because | |
1245 | the argument was not in the domain. */ | |
1246 | emit_cmp_and_jump_insns (target, target, EQ, 0, GET_MODE (target), | |
1247 | 0, 0, lab1); | |
1248 | ||
1249 | #ifdef TARGET_EDOM | |
1250 | { | |
1251 | #ifdef GEN_ERRNO_RTX | |
1252 | rtx errno_rtx = GEN_ERRNO_RTX; | |
1253 | #else | |
1254 | rtx errno_rtx | |
1255 | = gen_rtx_MEM (word_mode, gen_rtx_SYMBOL_REF (Pmode, "errno")); | |
1256 | #endif | |
1257 | ||
1258 | emit_move_insn (errno_rtx, GEN_INT (TARGET_EDOM)); | |
1259 | } | |
1260 | #else | |
1261 | /* We can't set errno=EDOM directly; let the library call do it. | |
1262 | Pop the arguments right away in case the call gets deleted. */ | |
1263 | NO_DEFER_POP; | |
1264 | expand_call (exp, target, 0); | |
1265 | OK_DEFER_POP; | |
1266 | #endif | |
1267 | ||
1268 | emit_label (lab1); | |
1269 | } | |
1270 | ||
1271 | /* Output the entire sequence. */ | |
1272 | insns = get_insns (); | |
1273 | end_sequence (); | |
1274 | emit_insns (insns); | |
1275 | ||
1276 | return target; | |
1277 | } | |
1278 | ||
1279 | /* Expand expression EXP which is a call to the strlen builtin. Return 0 | |
1280 | if we failed the caller should emit a normal call, otherwise | |
1281 | try to get the result in TARGET, if convenient (and in mode MODE if that's | |
1282 | convenient). */ | |
1283 | static rtx | |
1284 | expand_builtin_strlen (exp, target, mode) | |
1285 | tree exp; | |
1286 | rtx target; | |
1287 | enum machine_mode mode; | |
1288 | { | |
1289 | tree arglist = TREE_OPERAND (exp, 1); | |
1290 | enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp)); | |
1291 | ||
1292 | if (arglist == 0 | |
1293 | /* Arg could be non-pointer if user redeclared this fcn wrong. */ | |
1294 | || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE) | |
1295 | return 0; | |
1296 | else | |
1297 | { | |
1298 | tree src = TREE_VALUE (arglist); | |
1299 | tree len = c_strlen (src); | |
1300 | ||
1301 | int align | |
1302 | = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT; | |
1303 | ||
1304 | rtx result, src_rtx, char_rtx; | |
1305 | enum machine_mode insn_mode = value_mode, char_mode; | |
1306 | enum insn_code icode; | |
1307 | ||
1308 | /* If the length is known, just return it. */ | |
1309 | if (len != 0) | |
1310 | return expand_expr (len, target, mode, EXPAND_MEMORY_USE_BAD); | |
1311 | ||
1312 | /* If SRC is not a pointer type, don't do this operation inline. */ | |
1313 | if (align == 0) | |
1314 | return 0; | |
1315 | ||
1316 | /* Call a function if we can't compute strlen in the right mode. */ | |
1317 | ||
1318 | while (insn_mode != VOIDmode) | |
1319 | { | |
1320 | icode = strlen_optab->handlers[(int) insn_mode].insn_code; | |
1321 | if (icode != CODE_FOR_nothing) | |
1322 | return 0; | |
1323 | ||
1324 | insn_mode = GET_MODE_WIDER_MODE (insn_mode); | |
1325 | } | |
1326 | if (insn_mode == VOIDmode) | |
1327 | return 0; | |
1328 | ||
1329 | /* Make a place to write the result of the instruction. */ | |
1330 | result = target; | |
1331 | if (! (result != 0 | |
1332 | && GET_CODE (result) == REG | |
1333 | && GET_MODE (result) == insn_mode | |
1334 | && REGNO (result) >= FIRST_PSEUDO_REGISTER)) | |
1335 | result = gen_reg_rtx (insn_mode); | |
1336 | ||
1337 | /* Make sure the operands are acceptable to the predicates. */ | |
1338 | ||
1339 | if (! (*insn_operand_predicate[(int)icode][0]) (result, insn_mode)) | |
1340 | result = gen_reg_rtx (insn_mode); | |
1341 | src_rtx = memory_address (BLKmode, | |
1342 | expand_expr (src, NULL_RTX, ptr_mode, | |
1343 | EXPAND_NORMAL)); | |
1344 | ||
1345 | if (! (*insn_operand_predicate[(int)icode][1]) (src_rtx, Pmode)) | |
1346 | src_rtx = copy_to_mode_reg (Pmode, src_rtx); | |
1347 | ||
1348 | /* Check the string is readable and has an end. */ | |
1349 | if (current_function_check_memory_usage) | |
1350 | emit_library_call (chkr_check_str_libfunc, 1, VOIDmode, 2, | |
1351 | src_rtx, Pmode, | |
1352 | GEN_INT (MEMORY_USE_RO), | |
1353 | TYPE_MODE (integer_type_node)); | |
1354 | ||
1355 | char_rtx = const0_rtx; | |
1356 | char_mode = insn_operand_mode[(int)icode][2]; | |
1357 | if (! (*insn_operand_predicate[(int)icode][2]) (char_rtx, char_mode)) | |
1358 | char_rtx = copy_to_mode_reg (char_mode, char_rtx); | |
1359 | ||
1360 | emit_insn (GEN_FCN (icode) (result, | |
1361 | gen_rtx_MEM (BLKmode, src_rtx), | |
1362 | char_rtx, GEN_INT (align))); | |
1363 | ||
1364 | /* Return the value in the proper mode for this function. */ | |
1365 | if (GET_MODE (result) == value_mode) | |
1366 | return result; | |
1367 | else if (target != 0) | |
1368 | { | |
1369 | convert_move (target, result, 0); | |
1370 | return target; | |
1371 | } | |
1372 | else | |
1373 | return convert_to_mode (value_mode, result, 0); | |
1374 | } | |
1375 | } | |
1376 | ||
1377 | /* Expand a call to the memcpy builtin, with arguments in ARGLIST. */ | |
1378 | static rtx | |
1379 | expand_builtin_memcpy (arglist) | |
1380 | tree arglist; | |
1381 | { | |
1382 | if (arglist == 0 | |
1383 | /* Arg could be non-pointer if user redeclared this fcn wrong. */ | |
1384 | || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE | |
1385 | || TREE_CHAIN (arglist) == 0 | |
1386 | || (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) | |
1387 | != POINTER_TYPE) | |
1388 | || TREE_CHAIN (TREE_CHAIN (arglist)) == 0 | |
1389 | || (TREE_CODE (TREE_TYPE (TREE_VALUE | |
1390 | (TREE_CHAIN (TREE_CHAIN (arglist))))) | |
1391 | != INTEGER_TYPE)) | |
1392 | return 0; | |
1393 | else | |
1394 | { | |
1395 | tree dest = TREE_VALUE (arglist); | |
1396 | tree src = TREE_VALUE (TREE_CHAIN (arglist)); | |
1397 | tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))); | |
1398 | ||
1399 | int src_align | |
1400 | = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT; | |
1401 | int dest_align | |
1402 | = get_pointer_alignment (dest, BIGGEST_ALIGNMENT) / BITS_PER_UNIT; | |
1403 | rtx dest_mem, src_mem, dest_addr, len_rtx; | |
1404 | ||
1405 | /* If either SRC or DEST is not a pointer type, don't do | |
1406 | this operation in-line. */ | |
1407 | if (src_align == 0 || dest_align == 0) | |
1408 | return 0; | |
1409 | ||
1410 | dest_mem = get_memory_rtx (dest); | |
1411 | src_mem = get_memory_rtx (src); | |
1412 | len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0); | |
1413 | ||
1414 | /* Just copy the rights of SRC to the rights of DEST. */ | |
1415 | if (current_function_check_memory_usage) | |
1416 | emit_library_call (chkr_copy_bitmap_libfunc, 1, VOIDmode, 3, | |
1417 | XEXP (dest_mem, 0), Pmode, | |
1418 | XEXP (src_mem, 0), Pmode, | |
1419 | len_rtx, TYPE_MODE (sizetype)); | |
1420 | ||
1421 | /* Copy word part most expediently. */ | |
1422 | dest_addr | |
1423 | = emit_block_move (dest_mem, src_mem, len_rtx, | |
1424 | MIN (src_align, dest_align)); | |
1425 | ||
1426 | if (dest_addr == 0) | |
1427 | dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX); | |
1428 | ||
1429 | return dest_addr; | |
1430 | } | |
1431 | } | |
1432 | ||
1433 | /* Expand expression EXP, which is a call to the strcpy builtin. Return 0 | |
1434 | if we failed the caller should emit a normal call. */ | |
1435 | static rtx | |
1436 | expand_builtin_strcpy (exp) | |
1437 | tree exp; | |
1438 | { | |
1439 | tree arglist = TREE_OPERAND (exp, 1); | |
1440 | rtx result; | |
1441 | ||
1442 | if (arglist == 0 | |
1443 | /* Arg could be non-pointer if user redeclared this fcn wrong. */ | |
1444 | || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE | |
1445 | || TREE_CHAIN (arglist) == 0 | |
1446 | || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) != POINTER_TYPE) | |
1447 | return 0; | |
1448 | else | |
1449 | { | |
1450 | tree len = c_strlen (TREE_VALUE (TREE_CHAIN (arglist))); | |
1451 | ||
1452 | if (len == 0) | |
1453 | return 0; | |
1454 | ||
1455 | len = size_binop (PLUS_EXPR, len, integer_one_node); | |
1456 | ||
1457 | chainon (arglist, build_tree_list (NULL_TREE, len)); | |
1458 | } | |
1459 | result = expand_builtin_memcpy (arglist); | |
1460 | if (! result) | |
1461 | TREE_CHAIN (TREE_CHAIN (arglist)) = 0; | |
1462 | return result; | |
1463 | } | |
1464 | ||
1465 | /* Expand expression EXP, which is a call to the memset builtin. Return 0 | |
1466 | if we failed the caller should emit a normal call. */ | |
1467 | static rtx | |
1468 | expand_builtin_memset (exp) | |
1469 | tree exp; | |
1470 | { | |
1471 | tree arglist = TREE_OPERAND (exp, 1); | |
1472 | ||
1473 | if (arglist == 0 | |
1474 | /* Arg could be non-pointer if user redeclared this fcn wrong. */ | |
1475 | || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE | |
1476 | || TREE_CHAIN (arglist) == 0 | |
1477 | || (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) | |
1478 | != INTEGER_TYPE) | |
1479 | || TREE_CHAIN (TREE_CHAIN (arglist)) == 0 | |
1480 | || (INTEGER_TYPE | |
1481 | != (TREE_CODE (TREE_TYPE | |
1482 | (TREE_VALUE | |
1483 | (TREE_CHAIN (TREE_CHAIN (arglist)))))))) | |
1484 | return 0; | |
1485 | else | |
1486 | { | |
1487 | tree dest = TREE_VALUE (arglist); | |
1488 | tree val = TREE_VALUE (TREE_CHAIN (arglist)); | |
1489 | tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))); | |
1490 | ||
1491 | int dest_align | |
1492 | = get_pointer_alignment (dest, BIGGEST_ALIGNMENT) / BITS_PER_UNIT; | |
1493 | rtx dest_mem, dest_addr, len_rtx; | |
1494 | ||
1495 | /* If DEST is not a pointer type, don't do this | |
1496 | operation in-line. */ | |
1497 | if (dest_align == 0) | |
1498 | return 0; | |
1499 | ||
1500 | /* If the arguments have side-effects, then we can only evaluate | |
1501 | them at most once. The following code evaluates them twice if | |
1502 | they are not constants because we break out to expand_call | |
1503 | in that case. They can't be constants if they have side-effects | |
1504 | so we can check for that first. Alternatively, we could call | |
1505 | save_expr to make multiple evaluation safe. */ | |
1506 | if (TREE_SIDE_EFFECTS (val) || TREE_SIDE_EFFECTS (len)) | |
1507 | return 0; | |
1508 | ||
1509 | /* If VAL is not 0, don't do this operation in-line. */ | |
1510 | if (expand_expr (val, NULL_RTX, VOIDmode, 0) != const0_rtx) | |
1511 | return 0; | |
1512 | ||
1513 | /* If LEN does not expand to a constant, don't do this | |
1514 | operation in-line. */ | |
1515 | len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0); | |
1516 | if (GET_CODE (len_rtx) != CONST_INT) | |
1517 | return 0; | |
1518 | ||
1519 | dest_mem = get_memory_rtx (dest); | |
1520 | ||
1521 | /* Just check DST is writable and mark it as readable. */ | |
1522 | if (current_function_check_memory_usage) | |
1523 | emit_library_call (chkr_check_addr_libfunc, 1, VOIDmode, 3, | |
1524 | XEXP (dest_mem, 0), Pmode, | |
1525 | len_rtx, TYPE_MODE (sizetype), | |
1526 | GEN_INT (MEMORY_USE_WO), | |
1527 | TYPE_MODE (integer_type_node)); | |
1528 | ||
1529 | ||
1530 | dest_addr = clear_storage (dest_mem, len_rtx, dest_align); | |
1531 | ||
1532 | if (dest_addr == 0) | |
1533 | dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX); | |
1534 | ||
1535 | return dest_addr; | |
1536 | } | |
1537 | } | |
1538 | ||
1539 | #ifdef HAVE_cmpstrsi | |
1540 | /* Expand expression EXP, which is a call to the memcmp or the strcmp builtin. | |
1541 | ARGLIST is the argument list for this call. Return 0 if we failed and the | |
1542 | caller should emit a normal call, otherwise try to get the result in | |
1543 | TARGET, if convenient. */ | |
1544 | static rtx | |
1545 | expand_builtin_memcmp (exp, arglist, target) | |
1546 | tree exp; | |
1547 | tree arglist; | |
1548 | rtx target; | |
1549 | { | |
1550 | /* If we need to check memory accesses, call the library function. */ | |
1551 | if (current_function_check_memory_usage) | |
1552 | return 0; | |
1553 | ||
1554 | if (arglist == 0 | |
1555 | /* Arg could be non-pointer if user redeclared this fcn wrong. */ | |
1556 | || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE | |
1557 | || TREE_CHAIN (arglist) == 0 | |
1558 | || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) != POINTER_TYPE | |
1559 | || TREE_CHAIN (TREE_CHAIN (arglist)) == 0 | |
1560 | || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))))) != INTEGER_TYPE) | |
1561 | return 0; | |
1562 | else if (!HAVE_cmpstrsi) | |
1563 | return 0; | |
1564 | ||
1565 | { | |
1566 | enum machine_mode mode; | |
1567 | tree arg1 = TREE_VALUE (arglist); | |
1568 | tree arg2 = TREE_VALUE (TREE_CHAIN (arglist)); | |
1569 | tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))); | |
1570 | rtx result; | |
1571 | ||
1572 | int arg1_align | |
1573 | = get_pointer_alignment (arg1, BIGGEST_ALIGNMENT) / BITS_PER_UNIT; | |
1574 | int arg2_align | |
1575 | = get_pointer_alignment (arg2, BIGGEST_ALIGNMENT) / BITS_PER_UNIT; | |
1576 | enum machine_mode insn_mode | |
1577 | = insn_operand_mode[(int) CODE_FOR_cmpstrsi][0]; | |
1578 | ||
1579 | /* If we don't have POINTER_TYPE, call the function. */ | |
1580 | if (arg1_align == 0 || arg2_align == 0) | |
1581 | return 0; | |
1582 | ||
1583 | /* Make a place to write the result of the instruction. */ | |
1584 | result = target; | |
1585 | if (! (result != 0 | |
1586 | && GET_CODE (result) == REG && GET_MODE (result) == insn_mode | |
1587 | && REGNO (result) >= FIRST_PSEUDO_REGISTER)) | |
1588 | result = gen_reg_rtx (insn_mode); | |
1589 | ||
1590 | emit_insn (gen_cmpstrsi (result, get_memory_rtx (arg1), | |
1591 | get_memory_rtx (arg2), | |
1592 | expand_expr (len, NULL_RTX, VOIDmode, 0), | |
1593 | GEN_INT (MIN (arg1_align, arg2_align)))); | |
1594 | ||
1595 | /* Return the value in the proper mode for this function. */ | |
1596 | mode = TYPE_MODE (TREE_TYPE (exp)); | |
1597 | if (GET_MODE (result) == mode) | |
1598 | return result; | |
1599 | else if (target != 0) | |
1600 | { | |
1601 | convert_move (target, result, 0); | |
1602 | return target; | |
1603 | } | |
1604 | else | |
1605 | return convert_to_mode (mode, result, 0); | |
1606 | } | |
1607 | } | |
1608 | ||
1609 | /* Expand expression EXP, which is a call to the strcmp builtin. Return 0 | |
1610 | if we failed the caller should emit a normal call, otherwise try to get | |
1611 | the result in TARGET, if convenient. */ | |
1612 | static rtx | |
1613 | expand_builtin_strcmp (exp, target) | |
1614 | tree exp; | |
1615 | rtx target; | |
1616 | { | |
1617 | tree arglist = TREE_OPERAND (exp, 1); | |
1618 | ||
1619 | /* If we need to check memory accesses, call the library function. */ | |
1620 | if (current_function_check_memory_usage) | |
1621 | return 0; | |
1622 | ||
1623 | if (arglist == 0 | |
1624 | /* Arg could be non-pointer if user redeclared this fcn wrong. */ | |
1625 | || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE | |
1626 | || TREE_CHAIN (arglist) == 0 | |
1627 | || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) != POINTER_TYPE) | |
1628 | return 0; | |
1629 | else if (!HAVE_cmpstrsi) | |
1630 | return 0; | |
1631 | { | |
1632 | tree arg1 = TREE_VALUE (arglist); | |
1633 | tree arg2 = TREE_VALUE (TREE_CHAIN (arglist)); | |
1634 | tree len, len2; | |
1635 | rtx result; | |
1636 | len = c_strlen (arg1); | |
1637 | if (len) | |
1638 | len = size_binop (PLUS_EXPR, integer_one_node, len); | |
1639 | len2 = c_strlen (arg2); | |
1640 | if (len2) | |
1641 | len2 = size_binop (PLUS_EXPR, integer_one_node, len2); | |
1642 | ||
1643 | /* If we don't have a constant length for the first, use the length | |
1644 | of the second, if we know it. We don't require a constant for | |
1645 | this case; some cost analysis could be done if both are available | |
1646 | but neither is constant. For now, assume they're equally cheap. | |
1647 | ||
1648 | If both strings have constant lengths, use the smaller. This | |
1649 | could arise if optimization results in strcpy being called with | |
1650 | two fixed strings, or if the code was machine-generated. We should | |
1651 | add some code to the `memcmp' handler below to deal with such | |
1652 | situations, someday. */ | |
1653 | if (!len || TREE_CODE (len) != INTEGER_CST) | |
1654 | { | |
1655 | if (len2) | |
1656 | len = len2; | |
1657 | else if (len == 0) | |
1658 | return 0; | |
1659 | } | |
1660 | else if (len2 && TREE_CODE (len2) == INTEGER_CST) | |
1661 | { | |
1662 | if (tree_int_cst_lt (len2, len)) | |
1663 | len = len2; | |
1664 | } | |
1665 | ||
1666 | chainon (arglist, build_tree_list (NULL_TREE, len)); | |
1667 | result = expand_builtin_memcmp (exp, arglist, target); | |
1668 | if (! result) | |
1669 | TREE_CHAIN (TREE_CHAIN (arglist)) = 0; | |
1670 | return result; | |
1671 | } | |
1672 | } | |
1673 | #endif | |
1674 | ||
1675 | /* Expand expression EXP, which is a call to __builtin_saveregs, | |
1676 | generating the result in TARGET, if that's convenient. | |
1677 | IGNORE is nonzero if the value is to be ignored. */ | |
1678 | static rtx | |
1679 | expand_builtin_saveregs (exp, target, ignore) | |
1680 | tree exp; | |
1681 | rtx target; | |
1682 | int ignore; | |
1683 | { | |
1684 | enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp)); | |
1685 | ||
1686 | /* Don't do __builtin_saveregs more than once in a function. | |
1687 | Save the result of the first call and reuse it. */ | |
1688 | if (saveregs_value != 0) | |
1689 | return saveregs_value; | |
1690 | { | |
1691 | /* When this function is called, it means that registers must be | |
1692 | saved on entry to this function. So we migrate the | |
1693 | call to the first insn of this function. */ | |
1694 | rtx temp; | |
1695 | rtx seq; | |
1696 | ||
1697 | /* Now really call the function. `expand_call' does not call | |
1698 | expand_builtin, so there is no danger of infinite recursion here. */ | |
1699 | start_sequence (); | |
1700 | ||
1701 | #ifdef EXPAND_BUILTIN_SAVEREGS | |
1702 | /* Do whatever the machine needs done in this case. */ | |
1703 | temp = EXPAND_BUILTIN_SAVEREGS (arglist); | |
1704 | #else | |
1705 | /* The register where the function returns its value | |
1706 | is likely to have something else in it, such as an argument. | |
1707 | So preserve that register around the call. */ | |
1708 | ||
1709 | if (value_mode != VOIDmode) | |
1710 | { | |
1711 | rtx valreg = hard_libcall_value (value_mode); | |
1712 | rtx saved_valreg = gen_reg_rtx (value_mode); | |
1713 | ||
1714 | emit_move_insn (saved_valreg, valreg); | |
1715 | temp = expand_call (exp, target, ignore); | |
1716 | emit_move_insn (valreg, saved_valreg); | |
1717 | } | |
1718 | else | |
1719 | /* Generate the call, putting the value in a pseudo. */ | |
1720 | temp = expand_call (exp, target, ignore); | |
1721 | #endif | |
1722 | ||
1723 | seq = get_insns (); | |
1724 | end_sequence (); | |
1725 | ||
1726 | saveregs_value = temp; | |
1727 | ||
1728 | /* Put the sequence after the NOTE that starts the function. | |
1729 | If this is inside a SEQUENCE, make the outer-level insn | |
1730 | chain current, so the code is placed at the start of the | |
1731 | function. */ | |
1732 | push_topmost_sequence (); | |
1733 | emit_insns_before (seq, NEXT_INSN (get_insns ())); | |
1734 | pop_topmost_sequence (); | |
1735 | return temp; | |
1736 | } | |
1737 | } | |
1738 | ||
1739 | /* __builtin_args_info (N) returns word N of the arg space info | |
1740 | for the current function. The number and meanings of words | |
1741 | is controlled by the definition of CUMULATIVE_ARGS. */ | |
1742 | static rtx | |
1743 | expand_builtin_args_info (exp) | |
1744 | tree exp; | |
1745 | { | |
1746 | tree arglist = TREE_OPERAND (exp, 1); | |
1747 | int nwords = sizeof (CUMULATIVE_ARGS) / sizeof (int); | |
1748 | int *word_ptr = (int *) ¤t_function_args_info; | |
1749 | #if 0 | |
1750 | /* These are used by the code below that is if 0'ed away */ | |
1751 | int i; | |
1752 | tree type, elts, result; | |
1753 | #endif | |
1754 | ||
1755 | if (sizeof (CUMULATIVE_ARGS) % sizeof (int) != 0) | |
1756 | fatal ("CUMULATIVE_ARGS type defined badly; see %s, line %d", | |
1757 | __FILE__, __LINE__); | |
1758 | ||
1759 | if (arglist != 0) | |
1760 | { | |
1761 | tree arg = TREE_VALUE (arglist); | |
1762 | if (TREE_CODE (arg) != INTEGER_CST) | |
1763 | error ("argument of `__builtin_args_info' must be constant"); | |
1764 | else | |
1765 | { | |
1766 | int wordnum = TREE_INT_CST_LOW (arg); | |
1767 | ||
1768 | if (wordnum < 0 || wordnum >= nwords || TREE_INT_CST_HIGH (arg)) | |
1769 | error ("argument of `__builtin_args_info' out of range"); | |
1770 | else | |
1771 | return GEN_INT (word_ptr[wordnum]); | |
1772 | } | |
1773 | } | |
1774 | else | |
1775 | error ("missing argument in `__builtin_args_info'"); | |
1776 | ||
1777 | return const0_rtx; | |
1778 | ||
1779 | #if 0 | |
1780 | for (i = 0; i < nwords; i++) | |
1781 | elts = tree_cons (NULL_TREE, build_int_2 (word_ptr[i], 0)); | |
1782 | ||
1783 | type = build_array_type (integer_type_node, | |
1784 | build_index_type (build_int_2 (nwords, 0))); | |
1785 | result = build (CONSTRUCTOR, type, NULL_TREE, nreverse (elts)); | |
1786 | TREE_CONSTANT (result) = 1; | |
1787 | TREE_STATIC (result) = 1; | |
1788 | result = build (INDIRECT_REF, build_pointer_type (type), result); | |
1789 | TREE_CONSTANT (result) = 1; | |
1790 | return expand_expr (result, NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD); | |
1791 | #endif | |
1792 | } | |
1793 | ||
1794 | /* Expand expression EXP, which is a call to __builtin_next_arg. */ | |
1795 | static rtx | |
1796 | expand_builtin_next_arg (exp) | |
1797 | tree exp; | |
1798 | { | |
1799 | tree arglist = TREE_OPERAND (exp, 1); | |
1800 | tree fntype = TREE_TYPE (current_function_decl); | |
1801 | ||
1802 | if ((TYPE_ARG_TYPES (fntype) == 0 | |
1803 | || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype))) | |
1804 | == void_type_node)) | |
1805 | && ! current_function_varargs) | |
1806 | { | |
1807 | error ("`va_start' used in function with fixed args"); | |
1808 | return const0_rtx; | |
1809 | } | |
1810 | ||
1811 | if (arglist) | |
1812 | { | |
1813 | tree last_parm = tree_last (DECL_ARGUMENTS (current_function_decl)); | |
1814 | tree arg = TREE_VALUE (arglist); | |
1815 | ||
1816 | /* Strip off all nops for the sake of the comparison. This | |
1817 | is not quite the same as STRIP_NOPS. It does more. | |
1818 | We must also strip off INDIRECT_EXPR for C++ reference | |
1819 | parameters. */ | |
1820 | while (TREE_CODE (arg) == NOP_EXPR | |
1821 | || TREE_CODE (arg) == CONVERT_EXPR | |
1822 | || TREE_CODE (arg) == NON_LVALUE_EXPR | |
1823 | || TREE_CODE (arg) == INDIRECT_REF) | |
1824 | arg = TREE_OPERAND (arg, 0); | |
1825 | if (arg != last_parm) | |
1826 | warning ("second parameter of `va_start' not last named argument"); | |
1827 | } | |
1828 | else if (! current_function_varargs) | |
1829 | /* Evidently an out of date version of <stdarg.h>; can't validate | |
1830 | va_start's second argument, but can still work as intended. */ | |
1831 | warning ("`__builtin_next_arg' called without an argument"); | |
1832 | ||
1833 | return expand_binop (Pmode, add_optab, | |
1834 | current_function_internal_arg_pointer, | |
1835 | current_function_arg_offset_rtx, | |
1836 | NULL_RTX, 0, OPTAB_LIB_WIDEN); | |
1837 | } | |
1838 | ||
1839 | /* Expand a call to one of the builtin functions __builtin_frame_address or | |
1840 | __builtin_return_address. */ | |
1841 | static rtx | |
1842 | expand_builtin_frame_address (exp) | |
1843 | tree exp; | |
1844 | { | |
1845 | tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0); | |
1846 | tree arglist = TREE_OPERAND (exp, 1); | |
1847 | ||
1848 | /* The argument must be a nonnegative integer constant. | |
1849 | It counts the number of frames to scan up the stack. | |
1850 | The value is the return address saved in that frame. */ | |
1851 | if (arglist == 0) | |
1852 | /* Warning about missing arg was already issued. */ | |
1853 | return const0_rtx; | |
1854 | else if (TREE_CODE (TREE_VALUE (arglist)) != INTEGER_CST | |
1855 | || tree_int_cst_sgn (TREE_VALUE (arglist)) < 0) | |
1856 | { | |
1857 | if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS) | |
1858 | error ("invalid arg to `__builtin_frame_address'"); | |
1859 | else | |
1860 | error ("invalid arg to `__builtin_return_address'"); | |
1861 | return const0_rtx; | |
1862 | } | |
1863 | else | |
1864 | { | |
1865 | rtx tem = expand_builtin_return_addr (DECL_FUNCTION_CODE (fndecl), | |
1866 | TREE_INT_CST_LOW (TREE_VALUE (arglist)), | |
1867 | hard_frame_pointer_rtx); | |
1868 | ||
1869 | /* Some ports cannot access arbitrary stack frames. */ | |
1870 | if (tem == NULL) | |
1871 | { | |
1872 | if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS) | |
1873 | warning ("unsupported arg to `__builtin_frame_address'"); | |
1874 | else | |
1875 | warning ("unsupported arg to `__builtin_return_address'"); | |
1876 | return const0_rtx; | |
1877 | } | |
1878 | ||
1879 | /* For __builtin_frame_address, return what we've got. */ | |
1880 | if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS) | |
1881 | return tem; | |
1882 | ||
1883 | if (GET_CODE (tem) != REG | |
1884 | && ! CONSTANT_P (tem)) | |
1885 | tem = copy_to_mode_reg (Pmode, tem); | |
1886 | return tem; | |
1887 | } | |
1888 | } | |
1889 | ||
1890 | /* Expand a call to the alloca builtin, with arguments ARGLIST. Return 0 if | |
1891 | we failed and the caller should emit a normal call, otherwise try to get | |
1892 | the result in TARGET, if convenient. */ | |
1893 | static rtx | |
1894 | expand_builtin_alloca (arglist, target) | |
1895 | tree arglist; | |
1896 | rtx target; | |
1897 | { | |
1898 | rtx op0; | |
1899 | ||
1900 | if (arglist == 0 | |
1901 | /* Arg could be non-integer if user redeclared this fcn wrong. */ | |
1902 | || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != INTEGER_TYPE) | |
1903 | return 0; | |
1904 | ||
1905 | /* Compute the argument. */ | |
1906 | op0 = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0); | |
1907 | ||
1908 | /* Allocate the desired space. */ | |
1909 | return allocate_dynamic_stack_space (op0, target, BITS_PER_UNIT); | |
1910 | } | |
1911 | ||
1912 | /* Expand a call to the ffs builtin. The arguments are in ARGLIST. | |
1913 | Return 0 if a normal call should be emitted rather than expanding the | |
1914 | function in-line. If convenient, the result should be placed in TARGET. | |
1915 | SUBTARGET may be used as the target for computing one of EXP's operands. */ | |
1916 | static rtx | |
1917 | expand_builtin_ffs (arglist, target, subtarget) | |
1918 | tree arglist; | |
1919 | rtx target, subtarget; | |
1920 | { | |
1921 | rtx op0; | |
1922 | if (arglist == 0 | |
1923 | /* Arg could be non-integer if user redeclared this fcn wrong. */ | |
1924 | || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != INTEGER_TYPE) | |
1925 | return 0; | |
1926 | ||
1927 | /* Compute the argument. */ | |
1928 | op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0); | |
1929 | /* Compute ffs, into TARGET if possible. | |
1930 | Set TARGET to wherever the result comes back. */ | |
1931 | target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))), | |
1932 | ffs_optab, op0, target, 1); | |
1933 | if (target == 0) | |
1934 | abort (); | |
1935 | return target; | |
1936 | } | |
1937 | \f | |
1938 | /* Expand an expression EXP that calls a built-in function, | |
1939 | with result going to TARGET if that's convenient | |
1940 | (and in mode MODE if that's convenient). | |
1941 | SUBTARGET may be used as the target for computing one of EXP's operands. | |
1942 | IGNORE is nonzero if the value is to be ignored. */ | |
1943 | ||
1944 | rtx | |
1945 | expand_builtin (exp, target, subtarget, mode, ignore) | |
1946 | tree exp; | |
1947 | rtx target; | |
1948 | rtx subtarget; | |
1949 | enum machine_mode mode; | |
1950 | int ignore; | |
1951 | { | |
1952 | tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0); | |
1953 | tree arglist = TREE_OPERAND (exp, 1); | |
1954 | enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl); | |
1955 | ||
1956 | /* When not optimizing, generate calls to library functions for a certain | |
1957 | set of builtins. */ | |
1958 | if (! optimize && ! CALLED_AS_BUILT_IN (fndecl) | |
1959 | && (fcode == BUILT_IN_SIN || fcode == BUILT_IN_COS | |
1960 | || fcode == BUILT_IN_FSQRT || fcode == BUILT_IN_MEMSET | |
1961 | || fcode == BUILT_IN_MEMCPY || fcode == BUILT_IN_MEMCMP | |
1962 | || fcode == BUILT_IN_STRLEN || fcode == BUILT_IN_STRCPY | |
1963 | || fcode == BUILT_IN_STRCMP || fcode == BUILT_IN_FFS)) | |
1964 | return expand_call (exp, target, ignore); | |
1965 | ||
1966 | switch (fcode) | |
1967 | { | |
1968 | case BUILT_IN_ABS: | |
1969 | case BUILT_IN_LABS: | |
1970 | case BUILT_IN_FABS: | |
1971 | /* build_function_call changes these into ABS_EXPR. */ | |
1972 | abort (); | |
1973 | ||
1974 | case BUILT_IN_SIN: | |
1975 | case BUILT_IN_COS: | |
1976 | /* Treat these like sqrt, but only if the user asks for them. */ | |
1977 | if (! flag_fast_math) | |
1978 | break; | |
1979 | case BUILT_IN_FSQRT: | |
1980 | target = expand_builtin_mathfn (exp, target, subtarget); | |
1981 | if (target) | |
1982 | return target; | |
1983 | break; | |
1984 | ||
1985 | case BUILT_IN_FMOD: | |
1986 | break; | |
1987 | ||
1988 | case BUILT_IN_APPLY_ARGS: | |
1989 | return expand_builtin_apply_args (); | |
1990 | ||
1991 | /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes | |
1992 | FUNCTION with a copy of the parameters described by | |
1993 | ARGUMENTS, and ARGSIZE. It returns a block of memory | |
1994 | allocated on the stack into which is stored all the registers | |
1995 | that might possibly be used for returning the result of a | |
1996 | function. ARGUMENTS is the value returned by | |
1997 | __builtin_apply_args. ARGSIZE is the number of bytes of | |
1998 | arguments that must be copied. ??? How should this value be | |
1999 | computed? We'll also need a safe worst case value for varargs | |
2000 | functions. */ | |
2001 | case BUILT_IN_APPLY: | |
2002 | if (arglist == 0 | |
2003 | /* Arg could be non-pointer if user redeclared this fcn wrong. */ | |
2004 | || ! POINTER_TYPE_P (TREE_TYPE (TREE_VALUE (arglist))) | |
2005 | || TREE_CHAIN (arglist) == 0 | |
2006 | || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) != POINTER_TYPE | |
2007 | || TREE_CHAIN (TREE_CHAIN (arglist)) == 0 | |
2008 | || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))))) != INTEGER_TYPE) | |
2009 | return const0_rtx; | |
2010 | else | |
2011 | { | |
2012 | int i; | |
2013 | tree t; | |
2014 | rtx ops[3]; | |
2015 | ||
2016 | for (t = arglist, i = 0; t; t = TREE_CHAIN (t), i++) | |
2017 | ops[i] = expand_expr (TREE_VALUE (t), NULL_RTX, VOIDmode, 0); | |
2018 | ||
2019 | return expand_builtin_apply (ops[0], ops[1], ops[2]); | |
2020 | } | |
2021 | ||
2022 | /* __builtin_return (RESULT) causes the function to return the | |
2023 | value described by RESULT. RESULT is address of the block of | |
2024 | memory returned by __builtin_apply. */ | |
2025 | case BUILT_IN_RETURN: | |
2026 | if (arglist | |
2027 | /* Arg could be non-pointer if user redeclared this fcn wrong. */ | |
2028 | && TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) == POINTER_TYPE) | |
2029 | expand_builtin_return (expand_expr (TREE_VALUE (arglist), | |
2030 | NULL_RTX, VOIDmode, 0)); | |
2031 | return const0_rtx; | |
2032 | ||
2033 | case BUILT_IN_SAVEREGS: | |
2034 | return expand_builtin_saveregs (exp, target, ignore); | |
2035 | ||
2036 | case BUILT_IN_ARGS_INFO: | |
2037 | return expand_builtin_args_info (exp); | |
2038 | ||
2039 | /* Return the address of the first anonymous stack arg. */ | |
2040 | case BUILT_IN_NEXT_ARG: | |
2041 | return expand_builtin_next_arg (exp); | |
2042 | ||
2043 | case BUILT_IN_CLASSIFY_TYPE: | |
2044 | return expand_builtin_classify_type (arglist); | |
2045 | ||
2046 | case BUILT_IN_CONSTANT_P: | |
2047 | return expand_builtin_constant_p (exp); | |
2048 | ||
2049 | case BUILT_IN_FRAME_ADDRESS: | |
2050 | case BUILT_IN_RETURN_ADDRESS: | |
2051 | return expand_builtin_frame_address (exp); | |
2052 | ||
2053 | /* Returns the address of the area where the structure is returned. | |
2054 | 0 otherwise. */ | |
2055 | case BUILT_IN_AGGREGATE_INCOMING_ADDRESS: | |
2056 | if (arglist != 0 | |
2057 | || ! AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl))) | |
2058 | || GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl))) != MEM) | |
2059 | return const0_rtx; | |
2060 | else | |
2061 | return XEXP (DECL_RTL (DECL_RESULT (current_function_decl)), 0); | |
2062 | ||
2063 | case BUILT_IN_ALLOCA: | |
2064 | target = expand_builtin_alloca (arglist, target); | |
2065 | if (target) | |
2066 | return target; | |
2067 | break; | |
2068 | ||
2069 | case BUILT_IN_FFS: | |
2070 | target = expand_builtin_ffs (exp, target, subtarget); | |
2071 | if (target) | |
2072 | return target; | |
2073 | break; | |
2074 | ||
2075 | case BUILT_IN_STRLEN: | |
2076 | target = expand_builtin_strlen (exp, target, mode); | |
2077 | if (target) | |
2078 | return target; | |
2079 | break; | |
2080 | ||
2081 | case BUILT_IN_STRCPY: | |
2082 | target = expand_builtin_strcpy (exp); | |
2083 | if (target) | |
2084 | return target; | |
2085 | break; | |
2086 | ||
2087 | case BUILT_IN_MEMCPY: | |
2088 | target = expand_builtin_memcpy (arglist); | |
2089 | if (target) | |
2090 | return target; | |
2091 | break; | |
2092 | ||
2093 | case BUILT_IN_MEMSET: | |
2094 | target = expand_builtin_memset (exp); | |
2095 | if (target) | |
2096 | return target; | |
2097 | break; | |
2098 | ||
2099 | /* These comparison functions need an instruction that returns an actual | |
2100 | index. An ordinary compare that just sets the condition codes | |
2101 | is not enough. */ | |
2102 | #ifdef HAVE_cmpstrsi | |
2103 | case BUILT_IN_STRCMP: | |
2104 | target = expand_builtin_strcmp (exp, target); | |
2105 | if (target) | |
2106 | return target; | |
2107 | break; | |
2108 | ||
2109 | case BUILT_IN_MEMCMP: | |
2110 | target = expand_builtin_memcmp (exp, arglist, target); | |
2111 | if (target) | |
2112 | return target; | |
2113 | break; | |
2114 | #else | |
2115 | case BUILT_IN_STRCMP: | |
2116 | case BUILT_IN_MEMCMP: | |
2117 | break; | |
2118 | #endif | |
2119 | ||
2120 | case BUILT_IN_SETJMP: | |
2121 | if (arglist == 0 | |
2122 | || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE) | |
2123 | break; | |
2124 | else | |
2125 | { | |
2126 | rtx buf_addr = expand_expr (TREE_VALUE (arglist), subtarget, | |
2127 | VOIDmode, 0); | |
2128 | rtx lab = gen_label_rtx (); | |
2129 | rtx ret = expand_builtin_setjmp (buf_addr, target, lab, lab); | |
2130 | emit_label (lab); | |
2131 | return ret; | |
2132 | } | |
2133 | ||
2134 | /* __builtin_longjmp is passed a pointer to an array of five words. | |
2135 | It's similar to the C library longjmp function but works with | |
2136 | __builtin_setjmp above. */ | |
2137 | case BUILT_IN_LONGJMP: | |
2138 | if (arglist == 0 || TREE_CHAIN (arglist) == 0 | |
2139 | || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE) | |
2140 | break; | |
2141 | else | |
2142 | { | |
2143 | rtx buf_addr = expand_expr (TREE_VALUE (arglist), subtarget, | |
2144 | VOIDmode, 0); | |
2145 | rtx value = expand_expr (TREE_VALUE (TREE_CHAIN (arglist)), | |
2146 | NULL_RTX, VOIDmode, 0); | |
2147 | ||
2148 | if (value != const1_rtx) | |
2149 | { | |
2150 | error ("__builtin_longjmp second argument must be 1"); | |
2151 | return const0_rtx; | |
2152 | } | |
2153 | ||
2154 | expand_builtin_longjmp (buf_addr, value); | |
2155 | return const0_rtx; | |
2156 | } | |
2157 | ||
2158 | case BUILT_IN_TRAP: | |
2159 | #ifdef HAVE_trap | |
2160 | if (HAVE_trap) | |
2161 | emit_insn (gen_trap ()); | |
2162 | else | |
2163 | #endif | |
2164 | error ("__builtin_trap not supported by this target"); | |
2165 | emit_barrier (); | |
2166 | return const0_rtx; | |
2167 | ||
2168 | /* Various hooks for the DWARF 2 __throw routine. */ | |
2169 | case BUILT_IN_UNWIND_INIT: | |
2170 | expand_builtin_unwind_init (); | |
2171 | return const0_rtx; | |
2172 | case BUILT_IN_DWARF_CFA: | |
2173 | return virtual_cfa_rtx; | |
2174 | #ifdef DWARF2_UNWIND_INFO | |
2175 | case BUILT_IN_DWARF_FP_REGNUM: | |
2176 | return expand_builtin_dwarf_fp_regnum (); | |
2177 | case BUILT_IN_DWARF_REG_SIZE: | |
2178 | return expand_builtin_dwarf_reg_size (TREE_VALUE (arglist), target); | |
2179 | #endif | |
2180 | case BUILT_IN_FROB_RETURN_ADDR: | |
2181 | return expand_builtin_frob_return_addr (TREE_VALUE (arglist)); | |
2182 | case BUILT_IN_EXTRACT_RETURN_ADDR: | |
2183 | return expand_builtin_extract_return_addr (TREE_VALUE (arglist)); | |
2184 | case BUILT_IN_EH_RETURN: | |
2185 | expand_builtin_eh_return (TREE_VALUE (arglist), | |
2186 | TREE_VALUE (TREE_CHAIN (arglist)), | |
2187 | TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)))); | |
2188 | return const0_rtx; | |
2189 | ||
2190 | default: /* just do library call, if unknown builtin */ | |
2191 | error ("built-in function `%s' not currently supported", | |
2192 | IDENTIFIER_POINTER (DECL_NAME (fndecl))); | |
2193 | } | |
2194 | ||
2195 | /* The switch statement above can drop through to cause the function | |
2196 | to be called normally. */ | |
2197 | return expand_call (exp, target, ignore); | |
2198 | } |