| blob | 8b9a4a4d948b37a2aa438bc2a59d66b398850413 |
1 /* Expand builtin functions.
2 Copyright (C) 1988-2020 Free Software Foundation, Inc.
4 This file is part of GCC.
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
8 Software Foundation; either version 3, or (at your option) any later
9 version.
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.
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /* Legacy warning! Please add no further builtin simplifications here
21 (apart from pure constant folding) - builtin simplifications should go
22 to match.pd or gimple-fold.c instead. */
81 #if SWITCHABLE_TARGET
83 #endif
85 /* Define the names of the builtin function types and codes. */
89 #define DEF_BUILTIN(X, N, C, T, LT, B, F, NA, AT, IM, COND) #X,
91 {
93 };
95 /* Setup an array of builtin_info_type, make sure each element decl is
96 initialized to NULL_TREE. */
99 /* Non-zero if __builtin_constant_p should be folded right away. */
133 memop_ret retmode,
204 {
205 /* Set to valid. */
207 /* Invalidate. */
210 /* Set the default bounds of the access and adjust below. */
214 /* When BOUND is nonnull and a range can be extracted from it,
215 set the bounds of the access to reflect both it and MINACCESS.
216 BNDRNG[0] is the size of the minimum access. */
219 {
223 }
224 }
226 /* Return true if NAME starts with __builtin_ or __sync_. */
228 static bool
230 {
238 }
240 /* Return true if NODE should be considered for inline expansion regardless
241 of the optimization level. This means whenever a function is invoked with
242 its "internal" name, which normally contains the prefix "__builtin". */
244 bool
246 {
247 /* Note that we must use DECL_NAME, not DECL_ASSEMBLER_NAME_SET_P since
248 we want the name used to call the function, not the name it
249 will have. */
252 }
254 /* Compute values M and N such that M divides (address of EXP - N) and such
255 that N < M. If these numbers can be determined, store M in alignp and N in
256 *BITPOSP and return true. Otherwise return false and store BITS_PER_UNIT to
257 *alignp and any bit-offset to *bitposp.
259 Note that the address (and thus the alignment) computed here is based
260 on the address to which a symbol resolves, whereas DECL_ALIGN is based
261 on the address at which an object is actually located. These two
262 addresses are not always the same. For example, on ARM targets,
263 the address &foo of a Thumb function foo() has the lowest bit set,
264 whereas foo() itself starts on an even address.
266 If ADDR_P is true we are taking the address of the memory reference EXP
267 and thus cannot rely on the access taking place. */
269 static bool
272 {
274 tree offset;
275 machine_mode mode;
280 /* Get the innermost object and the constant (bitpos) and possibly
281 variable (offset) offset of the access. */
285 /* Extract alignment information from the innermost object and
286 possibly adjust bitpos and offset. */
288 {
289 /* Function addresses can encode extra information besides their
290 alignment. However, if TARGET_PTRMEMFUNC_VBIT_LOCATION
291 allows the low bit to be used as a virtual bit, we know
292 that the address itself must be at least 2-byte aligned. */
295 }
297 ;
299 {
300 /* The alignment of a CONST_DECL is determined by its initializer. */
307 }
309 {
312 }
316 {
322 /* If the address is explicitely aligned, handle that. */
325 {
330 }
332 known_alignment
336 /* Re-apply explicit alignment to the bitpos. */
339 /* The alignment of the pointer operand in a TARGET_MEM_REF
340 has to take the variable offset parts into account. */
342 {
344 {
349 }
353 }
355 /* When EXP is an actual memory reference then we can use
356 TYPE_ALIGN of a pointer indirection to derive alignment.
357 Do so only if get_pointer_alignment_1 did not reveal absolute
358 alignment knowledge and if using that alignment would
359 improve the situation. */
365 else
366 {
367 /* Else adjust bitpos accordingly. */
372 }
373 }
375 {
376 /* STRING_CST are the only constant objects we allow to be not
377 wrapped inside a CONST_DECL. */
383 }
385 /* If there is a non-constant offset part extract the maximum
386 alignment that can prevail. */
388 {
391 {
395 }
396 }
398 /* Account for the alignment of runtime coefficients, so that the constant
399 bitpos is guaranteed to be accurate. */
402 {
405 }
410 }
412 /* For a memory reference expression EXP compute values M and N such that M
413 divides (&EXP - N) and such that N < M. If these numbers can be determined,
414 store M in alignp and N in *BITPOSP and return true. Otherwise return false
415 and store BITS_PER_UNIT to *alignp and any bit-offset to *bitposp. */
417 bool
420 {
422 }
424 /* Return the alignment in bits of EXP, an object. */
426 unsigned int
428 {
434 /* align and bitpos now specify known low bits of the pointer.
435 ptr & (align - 1) == bitpos. */
440 }
442 /* For a pointer valued expression EXP compute values M and N such that M
443 divides (EXP - N) and such that N < M. If these numbers can be determined,
444 store M in alignp and N in *BITPOSP and return true. Return false if
445 the results are just a conservative approximation.
447 If EXP is not a pointer, false is returned too. */
449 bool
452 {
459 {
466 else
467 {
470 {
474 }
475 }
479 }
482 {
487 {
490 /* Make sure to return a sensible alignment when the multiplication
491 by BITS_PER_UNIT overflowed. */
494 /* We cannot really tell whether this result is an approximation. */
496 }
497 else
498 {
502 }
503 }
505 {
510 }
515 }
517 /* Return the alignment in bits of EXP, a pointer valued expression.
518 The alignment returned is, by default, the alignment of the thing that
519 EXP points to. If it is not a POINTER_TYPE, 0 is returned.
521 Otherwise, look at the expression to see if we can do better, i.e., if the
522 expression is actually pointing at an object whose alignment is tighter. */
524 unsigned int
526 {
532 /* align and bitpos now specify known low bits of the pointer.
533 ptr & (align - 1) == bitpos. */
539 }
541 /* Return the number of leading non-zero elements in the sequence
542 [ PTR, PTR + MAXELTS ) where each element's size is ELTSIZE bytes.
543 ELTSIZE must be a power of 2 less than 8. Used by c_strlen. */
545 unsigned
547 {
553 {
554 /* Optimize the common case of plain char. */
556 {
560 }
561 }
562 else
563 {
565 {
569 }
570 }
572 }
574 /* For a call EXPR at LOC to a function FNAME that expects a string
575 in the argument ARG, issue a diagnostic due to it being a called
576 with an argument that is a character array with no terminating
577 NUL. SIZE is the EXACT size of the array, and BNDRNG the number
578 of characters in which the NUL is expected. Either EXPR or FNAME
579 may be null but noth both. SIZE may be null when BNDRNG is null. */
581 void
586 {
593 /* Format the bound range as a string to keep the nuber of messages
594 from exploding. */
598 {
601 else
605 }
610 {
613 {
616 "%K%qD specified bound %s exceeds "
619 else
620 {
623 exact
626 : (maybe
628 "exceed the size of at most %E "
631 "the size of at most %E "
634 }
635 }
636 else
640 }
641 else
642 {
644 {
647 "%qs specified bound %s exceeds "
650 else
651 {
654 exact
657 : (maybe
659 "exceed the size of at most %E "
662 "the size of at most %E "
665 }
666 }
667 else
670 fname);
671 }
674 {
680 }
681 }
683 /* For a call EXPR (which may be null) that expects a string argument
684 SRC as an argument, returns false if SRC is a character array with
685 no terminating NUL. When nonnull, BOUND is the number of characters
686 in which to expect the terminating NUL. RDONLY is true for read-only
687 accesses such as strcmp, false for read-write such as strcpy. When
688 EXPR is also issues a warning. */
690 bool
693 {
694 /* The constant size of the array SRC points to. The actual size
695 may be less of EXACT is true, but not more. */
696 tree size;
697 /* True if SRC involves a non-constant offset into the array. */
699 /* The unterminated constant array SRC points to. */
704 /* NONSTR refers to the non-nul terminated constant array and SIZE
705 is the constant size of the array in bytes. EXACT is true when
706 SIZE is exact. */
710 {
713 else
714 {
718 }
721 {
724 }
727 }
734 }
736 /* If EXP refers to an unterminated constant character array return
737 the declaration of the object of which the array is a member or
738 element and if SIZE is not null, set *SIZE to the size of
739 the unterminated array and set *EXACT if the size is exact or
740 clear it otherwise. Otherwise return null. */
742 tree
744 {
745 /* C_STRLEN will return NULL and set DECL in the info
746 structure if EXP references a unterminated array. */
747 c_strlen_data lendata = { };
750 {
752 {
755 {
756 /* Constant offsets are already accounted for in LENDATA.MINLEN,
757 but not in a SSA_NAME + CST expression. */
762 {
763 /* Subtract the offset from the size of the array. */
768 }
769 else
771 }
772 else
776 }
778 }
781 }
783 /* Compute the length of a null-terminated character string or wide
784 character string handling character sizes of 1, 2, and 4 bytes.
785 TREE_STRING_LENGTH is not the right way because it evaluates to
786 the size of the character array in bytes (as opposed to characters)
787 and because it can contain a zero byte in the middle.
789 ONLY_VALUE should be nonzero if the result is not going to be emitted
790 into the instruction stream and zero if it is going to be expanded.
791 E.g. with i++ ? "foo" : "bar", if ONLY_VALUE is nonzero, constant 3
792 is returned, otherwise NULL, since
793 len = c_strlen (ARG, 1); if (len) expand_expr (len, ...); would not
794 evaluate the side-effects.
796 If ONLY_VALUE is two then we do not emit warnings about out-of-bound
797 accesses. Note that this implies the result is not going to be emitted
798 into the instruction stream.
800 Additional information about the string accessed may be recorded
801 in DATA. For example, if ARG references an unterminated string,
802 then the declaration will be stored in the DECL field. If the
803 length of the unterminated string can be determined, it'll be
804 stored in the LEN field. Note this length could well be different
805 than what a C strlen call would return.
807 ELTSIZE is 1 for normal single byte character strings, and 2 or
808 4 for wide characer strings. ELTSIZE is by default 1.
810 The value returned is of type `ssizetype'. */
812 tree
814 {
815 /* If we were not passed a DATA pointer, then get one to a local
816 structure. That avoids having to check DATA for NULL before
817 each time we want to use it. */
818 c_strlen_data local_strlen_data = { };
827 {
834 }
842 /* Offset from the beginning of the string in bytes. */
843 tree byteoff;
844 tree memsize;
845 tree decl;
850 /* Determine the size of the string element. */
854 /* Set MAXELTS to sizeof (SRC) / sizeof (*SRC) - 1, the maximum possible
855 length of SRC. Prefer TYPE_SIZE() to TREE_STRING_LENGTH() if possible
856 in case the latter is less than the size of the array, such as when
857 SRC refers to a short string literal used to initialize a large array.
858 In that case, the elements of the array after the terminating NUL are
859 all NUL. */
868 /* PTR can point to the byte representation of any string type, including
869 char* and wchar_t*. */
873 {
874 /* The code below works only for single byte character types. */
878 /* If the string has an internal NUL character followed by any
879 non-NUL characters (e.g., "foo\0bar"), we can't compute
880 the offset to the following NUL if we don't know where to
881 start searching for it. */
884 /* Return when an embedded null character is found or none at all.
885 In the latter case, set the DECL/LEN field in the DATA structure
886 so that callers may examine them. */
890 {
895 }
897 /* For empty strings the result should be zero. */
901 /* We don't know the starting offset, but we do know that the string
902 has no internal zero bytes. If the offset falls within the bounds
903 of the string subtract the offset from the length of the string,
904 and return that. Otherwise the length is zero. Take care to
905 use SAVE_EXPR in case the OFFSET has side-effects. */
912 offsave);
916 }
918 /* Offset from the beginning of the string in elements. */
919 HOST_WIDE_INT eltoff;
921 /* We have a known offset into the string. Start searching there for
922 a null character if we can represent it as a single HOST_WIDE_INT. */
927 else
930 /* If the offset is known to be out of bounds, warn, and call strlen at
931 runtime. */
933 {
934 /* Suppress multiple warnings for propagated constant strings. */
939 eltoff))
940 {
944 }
946 }
948 /* If eltoff is larger than strelts but less than maxelts the
949 string length is zero, since the excess memory will be zero. */
953 /* Use strlen to search for the first zero byte. Since any strings
954 constructed with build_string will have nulls appended, we win even
955 if we get handed something like (char[4])"abcd".
957 Since ELTOFF is our starting index into the string, no further
958 calculation is needed. */
962 /* Don't know what to return if there was no zero termination.
963 Ideally this would turn into a gcc_checking_assert over time.
964 Set DECL/LEN so callers can examine them. */
966 {
971 }
974 }
976 /* Return a constant integer corresponding to target reading
977 GET_MODE_BITSIZE (MODE) bits from string constant STR. If
978 NULL_TERMINATED_P, reading stops after '\0' character, all further ones
979 are assumed to be zero, otherwise it reads as many characters
980 as needed. */
982 rtx
985 {
986 HOST_WIDE_INT ch;
1000 {
1012 }
1016 }
1018 /* Cast a target constant CST to target CHAR and if that value fits into
1019 host char type, return zero and put that value into variable pointed to by
1020 P. */
1022 static int
1024 {
1031 /* Do not care if it fits or not right here. */
1046 }
1048 /* Similar to save_expr, but assumes that arbitrary code is not executed
1049 in between the multiple evaluations. In particular, we assume that a
1050 non-addressable local variable will not be modified. */
1052 static tree
1054 {
1062 }
1064 /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
1065 times to get the address of either a higher stack frame, or a return
1066 address located within it (depending on FNDECL_CODE). */
1068 static rtx
1070 {
1074 {
1075 /* For a zero count with __builtin_return_address, we don't care what
1076 frame address we return, because target-specific definitions will
1077 override us. Therefore frame pointer elimination is OK, and using
1078 the soft frame pointer is OK.
1080 For a nonzero count, or a zero count with __builtin_frame_address,
1081 we require a stable offset from the current frame pointer to the
1082 previous one, so we must use the hard frame pointer, and
1083 we must disable frame pointer elimination. */
1086 else
1087 {
1090 /* Tell reload not to eliminate the frame pointer. */
1092 }
1093 }
1098 /* On the SPARC, the return address is not in the frame, it is in a
1099 register. There is no way to access it off of the current frame
1100 pointer, but it can be accessed off the previous frame pointer by
1101 reading the value from the register window save area. */
1103 count--;
1105 /* Scan back COUNT frames to the specified frame. */
1107 {
1108 /* Assume the dynamic chain pointer is in the word that the
1109 frame address points to, unless otherwise specified. */
1114 }
1116 /* For __builtin_frame_address, return what we've got. But, on
1117 the SPARC for example, we may have to add a bias. */
1121 /* For __builtin_return_address, get the return address from that frame. */
1122 #ifdef RETURN_ADDR_RTX
1124 #else
1128 #endif
1130 }
1132 /* Alias set used for setjmp buffer. */
1135 /* Construct the leading half of a __builtin_setjmp call. Control will
1136 return to RECEIVER_LABEL. This is also called directly by the SJLJ
1137 exception handling code. */
1139 void
1141 {
1143 rtx stack_save;
1144 rtx mem;
1153 /* We store the frame pointer and the address of receiver_label in
1154 the buffer and use the rest of it for the stack save area, which
1155 is machine-dependent. */
1174 /* If there is further processing to do, do it. */
1178 /* We have a nonlocal label. */
1180 }
1182 /* Construct the trailing part of a __builtin_setjmp call. This is
1183 also called directly by the SJLJ exception handling code.
1184 If RECEIVER_LABEL is NULL, instead contruct a nonlocal goto handler. */
1186 void
1188 {
1189 rtx chain;
1191 /* Mark the FP as used when we get here, so we have to make sure it's
1192 marked as used by this function. */
1195 /* Mark the static chain as clobbered here so life information
1196 doesn't get messed up for it. */
1202 {
1203 /* If the argument pointer can be eliminated in favor of the
1204 frame pointer, we don't need to restore it. We assume here
1205 that if such an elimination is present, it can always be used.
1206 This is the case on all known machines; if we don't make this
1207 assumption, we do unnecessary saving on many machines. */
1217 {
1218 /* Now restore our arg pointer from the address at which it
1219 was saved in our stack frame. */
1222 }
1223 }
1229 else
1232 /* We must not allow the code we just generated to be reordered by
1233 scheduling. Specifically, the update of the frame pointer must
1234 happen immediately, not later. */
1236 }
1238 /* __builtin_longjmp is passed a pointer to an array of five words (not
1239 all will be used on all machines). It operates similarly to the C
1240 library function of the same name, but is more efficient. Much of
1241 the code below is copied from the handling of non-local gotos. */
1243 static void
1245 {
1250 /* DRAP is needed for stack realign if longjmp is expanded to current
1251 function */
1262 /* We require that the user must pass a second argument of 1, because
1263 that is what builtin_setjmp will return. */
1269 else
1270 {
1281 /* Pick up FP, label, and SP from the block and jump. This code is
1282 from expand_goto in stmt.c; see there for detailed comments. */
1284 /* We have to pass a value to the nonlocal_goto pattern that will
1285 get copied into the static_chain pointer, but it does not matter
1286 what that value is, because builtin_setjmp does not use it. */
1288 else
1289 {
1295 /* Restore the frame pointer and stack pointer. We must use a
1296 temporary since the setjmp buffer may be a local. */
1300 /* Ensure the frame pointer move is not optimized. */
1309 }
1310 }
1312 /* Search backwards and mark the jump insn as a non-local goto.
1313 Note that this precludes the use of __builtin_longjmp to a
1314 __builtin_setjmp target in the same function. However, we've
1315 already cautioned the user that these functions are for
1316 internal exception handling use only. */
1318 {
1322 {
1325 }
1328 }
1329 }
1333 {
1335 }
1337 /* This function validates the types of a function call argument list
1338 against a specified list of tree_codes. If the last specifier is a 0,
1339 that represents an ellipsis, otherwise the last specifier must be a
1340 VOID_TYPE. */
1342 static bool
1344 {
1348 const_call_expr_arg_iterator iter;
1349 const_tree arg;
1354 /* Get a bitmap of pointer argument numbers declared attribute nonnull. */
1359 {
1363 {
1365 /* This signifies an ellipses, any further arguments are all ok. */
1369 /* This signifies an endlink, if no arguments remain, return
1370 true, otherwise return false. */
1374 /* The actual argument must be nonnull when either the whole
1375 called function has been declared nonnull, or when the formal
1376 argument corresponding to the actual argument has been. */
1379 {
1384 }
1385 /* FALLTHRU */
1387 /* If no parameters remain or the parameter's code does not
1388 match the specified code, return false. Otherwise continue
1389 checking any remaining arguments. */
1394 }
1395 }
1397 /* We need gotos here since we can only have one VA_CLOSE in a
1398 function. */
1399 end: ;
1405 }
1407 /* Expand a call to __builtin_nonlocal_goto. We're passed the target label
1408 and the address of the save area. */
1410 static rtx
1412 {
1427 /* Copy the address of the save location to a register just in case it was
1428 based on the frame pointer. */
1437 /* ??? We no longer need to pass the static chain value, afaik. */
1440 else
1441 {
1447 /* Restore the frame pointer and stack pointer. We must use a
1448 temporary since the setjmp buffer may be a local. */
1452 /* Ensure the frame pointer move is not optimized. */
1458 /* USE of hard_frame_pointer_rtx added for consistency;
1459 not clear if really needed. */
1463 /* If the architecture is using a GP register, we must
1464 conservatively assume that the target function makes use of it.
1465 The prologue of functions with nonlocal gotos must therefore
1466 initialize the GP register to the appropriate value, and we
1467 must then make sure that this value is live at the point
1468 of the jump. (Note that this doesn't necessarily apply
1469 to targets with a nonlocal_goto pattern; they are free
1470 to implement it in their own way. Note also that this is
1471 a no-op if the GP register is a global invariant.) */
1477 }
1479 /* Search backwards to the jump insn and mark it as a
1480 non-local goto. */
1482 {
1484 {
1487 }
1490 }
1493 }
1495 /* __builtin_update_setjmp_buf is passed a pointer to an array of five words
1496 (not all will be used on all machines) that was passed to __builtin_setjmp.
1497 It updates the stack pointer in that block to the current value. This is
1498 also called directly by the SJLJ exception handling code. */
1500 void
1502 {
1505 rtx stack_save
1507 memory_address
1513 }
1515 /* Expand a call to __builtin_prefetch. For a target that does not support
1516 data prefetch, evaluate the memory address argument in case it has side
1517 effects. */
1519 static void
1521 {
1531 /* Arguments 1 and 2 are optional; argument 1 (read/write) defaults to
1532 zero (read) and argument 2 (locality) defaults to 3 (high degree of
1533 locality). */
1537 else
1541 else
1544 /* Argument 0 is an address. */
1547 /* Argument 1 (read/write flag) must be a compile-time constant int. */
1549 {
1552 }
1554 /* Argument 1 must be either zero or one. */
1556 {
1560 }
1562 /* Argument 2 (locality) must be a compile-time constant int. */
1564 {
1567 }
1569 /* Argument 2 must be 0, 1, 2, or 3. */
1571 {
1574 }
1577 {
1585 }
1587 /* Don't do anything with direct references to volatile memory, but
1588 generate code to handle other side effects. */
1591 }
1593 /* Get a MEM rtx for expression EXP which is the address of an operand
1594 to be used in a string instruction (cmpstrsi, cpymemsi, ..). LEN is
1595 the maximum length of the block of memory that might be accessed or
1596 NULL if unknown. */
1598 static rtx
1600 {
1604 /* When EXP is not resolved SAVE_EXPR, MEM_ATTRS can be still derived
1605 from its expression, for expr->a.b only <variable>.a.b is recorded. */
1612 /* Get an expression we can use to find the attributes to assign to MEM.
1613 First remove any nops. */
1618 /* Build a MEM_REF representing the whole accessed area as a byte blob,
1619 (as builtin stringops may alias with anything). */
1626 /* If the MEM_REF has no acceptable address, try to get the base object
1627 from the original address we got, and build an all-aliasing
1628 unknown-sized access to that one. */
1634 {
1639 size_zero_node,
1640 NULL)),
1643 }
1646 }
1647 \f
1648 /* Built-in functions to perform an untyped call and return. */
1650 #define apply_args_mode \
1651 (this_target_builtins->x_apply_args_mode)
1652 #define apply_result_mode \
1653 (this_target_builtins->x_apply_result_mode)
1655 /* Return the size required for the block returned by __builtin_apply_args,
1656 and initialize apply_args_mode. */
1658 static int
1660 {
1665 /* The values computed by this function never change. */
1667 {
1668 /* The first value is the incoming arg-pointer. */
1671 /* The second value is the structure value address unless this is
1672 passed as an "invisible" first argument. */
1678 {
1688 }
1689 else
1690 {
1692 }
1693 }
1695 }
1697 /* Return the size required for the block returned by __builtin_apply,
1698 and initialize apply_result_mode. */
1700 static int
1702 {
1706 /* The values computed by this function never change. */
1708 {
1713 {
1723 }
1724 else
1727 /* Allow targets that use untyped_call and untyped_return to override
1728 the size so that machine-specific information can be stored here. */
1729 #ifdef APPLY_RESULT_SIZE
1731 #endif
1732 }
1734 }
1736 /* Create a vector describing the result block RESULT. If SAVEP is true,
1737 the result block is used to save the values; otherwise it is used to
1738 restore the values. */
1740 static rtx
1742 {
1744 fixed_size_mode mode;
1751 {
1761 }
1763 }
1765 /* Save the state required to perform an untyped call with the same
1766 arguments as were passed to the current function. */
1768 static rtx
1770 {
1773 fixed_size_mode mode;
1774 rtx struct_incoming_value = targetm.calls.struct_value_rtx (cfun ? TREE_TYPE (cfun->decl) : 0, 1);
1776 /* Create a block where the arg-pointer, structure value address,
1777 and argument registers can be saved. */
1780 /* Walk past the arg-pointer and structure value address. */
1785 /* Save each register used in calling a function to the block. */
1788 {
1797 }
1799 /* Save the arg pointer to the block. */
1801 /* We need the pointer as the caller actually passed them to us, not
1802 as we might have pretended they were passed. Make sure it's a valid
1803 operand, as emit_move_insn isn't expected to handle a PLUS. */
1805 tem
1808 NULL_RTX);
1813 /* Save the structure value address unless this is passed as an
1814 "invisible" first argument. */
1819 /* Return the address of the block. */
1821 }
1823 /* __builtin_apply_args returns block of memory allocated on
1824 the stack into which is stored the arg pointer, structure
1825 value address, static chain, and all the registers that might
1826 possibly be used in performing a function call. The code is
1827 moved to the start of the function so the incoming values are
1828 saved. */
1830 static rtx
1832 {
1833 /* Don't do __builtin_apply_args more than once in a function.
1834 Save the result of the first call and reuse it. */
1837 {
1838 /* When this function is called, it means that registers must be
1839 saved on entry to this function. So we migrate the
1840 call to the first insn of this function. */
1841 rtx temp;
1850 /* Put the insns after the NOTE that starts the function.
1851 If this is inside a start_sequence, make the outer-level insn
1852 chain current, so the code is placed at the start of the
1853 function. If internal_arg_pointer is a non-virtual pseudo,
1854 it needs to be placed after the function that initializes
1855 that pseudo. */
1860 else
1864 }
1865 }
1867 /* Perform an untyped call and save the state required to perform an
1868 untyped return of whatever value was returned by the given function. */
1870 static rtx
1872 {
1874 fixed_size_mode mode;
1883 /* Create a block where the return registers can be saved. */
1886 /* Fetch the arg pointer from the ARGUMENTS block. */
1893 /* Push a new argument block and copy the arguments. Do not allow
1894 the (potential) memcpy call below to interfere with our stack
1895 manipulations. */
1897 NO_DEFER_POP;
1899 /* Save the stack with nonlocal if available. */
1902 else
1905 /* Allocate a block of memory onto the stack and copy the memory
1906 arguments to the outgoing arguments address. We can pass TRUE
1907 as the 4th argument because we just saved the stack pointer
1908 and will restore it right after the call. */
1911 /* Set DRAP flag to true, even though allocate_dynamic_stack_space
1912 may have already set current_function_calls_alloca to true.
1913 current_function_calls_alloca won't be set if argsize is zero,
1914 so we have to guarantee need_drap is true here. */
1920 {
1923 else
1925 }
1932 /* Refer to the argument block. */
1937 /* Walk past the arg-pointer and structure value address. */
1942 /* Restore each of the registers previously saved. Make USE insns
1943 for each of these registers for use in making the call. */
1946 {
1954 }
1956 /* Restore the structure value address unless this is passed as an
1957 "invisible" first argument. */
1960 {
1966 }
1968 /* All arguments and registers used for the call are set up by now! */
1971 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
1972 and we don't want to load it into a register as an optimization,
1973 because prepare_call_address already did it if it should be done. */
1977 /* Generate the actual call instruction and save the return value. */
1979 {
1983 }
1985 {
1988 /* Locate the unique return register. It is not possible to
1989 express a call that sets more than one return register using
1990 call_value; use untyped_call for that. In fact, untyped_call
1991 only needs to save the return registers in the given block. */
1994 {
1998 }
2005 }
2006 else
2009 /* Find the CALL insn we just emitted, and attach the register usage
2010 information. */
2014 /* Restore the stack. */
2017 else
2021 OK_DEFER_POP;
2023 /* Return the address of the result block. */
2026 }
2028 /* Perform an untyped return. */
2030 static void
2032 {
2034 fixed_size_mode mode;
2035 rtx reg;
2044 {
2049 }
2051 /* Restore the return value and note that each value is used. */
2055 {
2067 }
2069 /* Put the USE insns before the return. */
2072 /* Return whatever values was restored by jumping directly to the end
2073 of the function. */
2075 }
2077 /* Used by expand_builtin_classify_type and fold_builtin_classify_type. */
2079 static enum type_class
2081 {
2083 {
2102 }
2103 }
2105 /* Expand a call EXP to __builtin_classify_type. */
2107 static rtx
2109 {
2113 }
2115 /* This helper macro, meant to be used in mathfn_built_in below, determines
2116 which among a set of builtin math functions is appropriate for a given type
2117 mode. The `F' (float) and `L' (long double) are automatically generated
2118 from the 'double' case. If a function supports the _Float<N> and _Float<N>X
2119 types, there are additional types that are considered with 'F32', 'F64',
2120 'F128', etc. suffixes. */
2121 #define CASE_MATHFN(MATHFN) \
2122 CASE_CFN_##MATHFN: \
2123 fcode = BUILT_IN_##MATHFN; fcodef = BUILT_IN_##MATHFN##F ; \
2124 fcodel = BUILT_IN_##MATHFN##L ; break;
2125 /* Similar to the above, but also add support for the _Float<N> and _Float<N>X
2126 types. */
2127 #define CASE_MATHFN_FLOATN(MATHFN) \
2128 CASE_CFN_##MATHFN: \
2129 fcode = BUILT_IN_##MATHFN; fcodef = BUILT_IN_##MATHFN##F ; \
2130 fcodel = BUILT_IN_##MATHFN##L ; fcodef16 = BUILT_IN_##MATHFN##F16 ; \
2131 fcodef32 = BUILT_IN_##MATHFN##F32; fcodef64 = BUILT_IN_##MATHFN##F64 ; \
2132 fcodef128 = BUILT_IN_##MATHFN##F128 ; fcodef32x = BUILT_IN_##MATHFN##F32X ; \
2133 fcodef64x = BUILT_IN_##MATHFN##F64X ; fcodef128x = BUILT_IN_##MATHFN##F128X ;\
2134 break;
2135 /* Similar to above, but appends _R after any F/L suffix. */
2136 #define CASE_MATHFN_REENT(MATHFN) \
2137 case CFN_BUILT_IN_##MATHFN##_R: \
2138 case CFN_BUILT_IN_##MATHFN##F_R: \
2139 case CFN_BUILT_IN_##MATHFN##L_R: \
2140 fcode = BUILT_IN_##MATHFN##_R; fcodef = BUILT_IN_##MATHFN##F_R ; \
2141 fcodel = BUILT_IN_##MATHFN##L_R ; break;
2143 /* Return a function equivalent to FN but operating on floating-point
2144 values of type TYPE, or END_BUILTINS if no such function exists.
2145 This is purely an operation on function codes; it does not guarantee
2146 that the target actually has an implementation of the function. */
2148 static built_in_function
2150 {
2151 tree mtype;
2162 {
2254 }
2277 else
2279 }
2281 /* Return mathematic function equivalent to FN but operating directly on TYPE,
2282 if available. If IMPLICIT_P is true use the implicit builtin declaration,
2283 otherwise use the explicit declaration. If we can't do the conversion,
2284 return null. */
2286 static tree
2288 {
2297 }
2299 /* Like mathfn_built_in_1, but always use the implicit array. */
2301 tree
2303 {
2305 }
2307 /* Like mathfn_built_in_1, but take a built_in_function and
2308 always use the implicit array. */
2310 tree
2312 {
2314 }
2316 /* If BUILT_IN_NORMAL function FNDECL has an associated internal function,
2317 return its code, otherwise return IFN_LAST. Note that this function
2318 only tests whether the function is defined in internals.def, not whether
2319 it is actually available on the target. */
2321 internal_fn
2323 {
2327 {
2328 #define DEF_INTERNAL_FLT_FN(NAME, FLAGS, OPTAB, TYPE) \
2329 CASE_FLT_FN (BUILT_IN_##NAME): return IFN_##NAME;
2330 #define DEF_INTERNAL_FLT_FLOATN_FN(NAME, FLAGS, OPTAB, TYPE) \
2331 CASE_FLT_FN (BUILT_IN_##NAME): return IFN_##NAME; \
2332 CASE_FLT_FN_FLOATN_NX (BUILT_IN_##NAME): return IFN_##NAME;
2333 #define DEF_INTERNAL_INT_FN(NAME, FLAGS, OPTAB, TYPE) \
2334 CASE_INT_FN (BUILT_IN_##NAME): return IFN_##NAME;
2351 }
2352 }
2354 /* If CALL is a call to a BUILT_IN_NORMAL function that could be replaced
2355 on the current target by a call to an internal function, return the
2356 code of that internal function, otherwise return IFN_LAST. The caller
2357 is responsible for ensuring that any side-effects of the built-in
2358 call are dealt with correctly. E.g. if CALL sets errno, the caller
2359 must decide that the errno result isn't needed or make it available
2360 in some other way. */
2362 internal_fn
2364 {
2366 {
2369 {
2374 }
2375 }
2377 }
2379 /* Expand a call to the builtin trinary math functions (fma).
2380 Return NULL_RTX if a normal call should be emitted rather than expanding the
2381 function in-line. EXP is the expression that is a call to the builtin
2382 function; if convenient, the result should be placed in TARGET.
2383 SUBTARGET may be used as the target for computing one of EXP's
2384 operands. */
2386 static rtx
2388 {
2389 optab builtin_optab;
2394 machine_mode mode;
2404 {
2410 }
2412 /* Make a suitable register to place result in. */
2415 /* Before working hard, check whether the instruction is available. */
2421 /* Always stabilize the argument list. */
2432 /* Compute into RESULT.
2433 Set RESULT to wherever the result comes back. */
2437 /* If we were unable to expand via the builtin, stop the sequence
2438 (without outputting the insns) and call to the library function
2439 with the stabilized argument list. */
2441 {
2444 }
2446 /* Output the entire sequence. */
2452 }
2454 /* Expand a call to the builtin sin and cos math functions.
2455 Return NULL_RTX if a normal call should be emitted rather than expanding the
2456 function in-line. EXP is the expression that is a call to the builtin
2457 function; if convenient, the result should be placed in TARGET.
2458 SUBTARGET may be used as the target for computing one of EXP's
2459 operands. */
2461 static rtx
2463 {
2464 optab builtin_optab;
2465 rtx op0;
2468 machine_mode mode;
2469 tree arg;
2477 {
2483 }
2485 /* Make a suitable register to place result in. */
2488 /* Check if sincos insn is available, otherwise fallback
2489 to sin or cos insn. */
2492 {
2499 }
2501 /* Before working hard, check whether the instruction is available. */
2503 {
2506 /* Wrap the computation of the argument in a SAVE_EXPR, as we may
2507 need to expand the argument again. This way, we will not perform
2508 side-effects more the once. */
2515 /* Compute into RESULT.
2516 Set RESULT to wherever the result comes back. */
2518 {
2522 {
2531 }
2533 }
2534 else
2538 {
2539 /* Output the entire sequence. */
2544 }
2546 /* If we were unable to expand via the builtin, stop the sequence
2547 (without outputting the insns) and call to the library function
2548 with the stabilized argument list. */
2550 }
2553 }
2555 /* Given an interclass math builtin decl FNDECL and it's argument ARG
2556 return an RTL instruction code that implements the functionality.
2557 If that isn't possible or available return CODE_FOR_nothing. */
2559 static enum insn_code
2561 {
2564 machine_mode mode;
2567 {
2581 /* These builtins have no optabs (yet). */
2585 }
2587 /* There's no easy way to detect the case we need to set EDOM. */
2591 /* Optab mode depends on the mode of the input argument. */
2597 }
2599 /* Expand a call to one of the builtin math functions that operate on
2600 floating point argument and output an integer result (ilogb, isinf,
2601 isnan, etc).
2602 Return 0 if a normal call should be emitted rather than expanding the
2603 function in-line. EXP is the expression that is a call to the builtin
2604 function; if convenient, the result should be placed in TARGET. */
2606 static rtx
2608 {
2610 rtx op0;
2612 machine_mode mode;
2613 tree arg;
2623 {
2628 /* Wrap the computation of the argument in a SAVE_EXPR, as we may
2629 need to expand the argument again. This way, we will not perform
2630 side-effects more the once. */
2645 }
2648 }
2650 /* Expand a call to the builtin sincos math function.
2651 Return NULL_RTX if a normal call should be emitted rather than expanding the
2652 function in-line. EXP is the expression that is a call to the builtin
2653 function. */
2655 static rtx
2657 {
2659 machine_mode mode;
2673 /* Make a suitable register to place result in. */
2676 /* Check if sincos insn is available, otherwise emit the call. */
2691 /* Compute into target1 and target2.
2692 Set TARGET to wherever the result comes back. */
2696 /* Move target1 and target2 to the memory locations indicated
2697 by op1 and op2. */
2702 }
2704 /* Expand a call to the internal cexpi builtin to the sincos math function.
2705 EXP is the expression that is a call to the builtin function; if convenient,
2706 the result should be placed in TARGET. */
2708 static rtx
2710 {
2713 machine_mode mode;
2724 /* Try expanding via a sincos optab, fall back to emitting a libcall
2725 to sincos or cexp. We are sure we have sincos or cexp because cexpi
2726 is only generated from sincos, cexp or if we have either of them. */
2728 {
2734 /* Compute into op1 and op2. */
2736 }
2738 {
2749 else
2759 /* Make sure not to fold the sincos call again. */
2763 }
2764 else
2765 {
2775 else
2778 /* If we don't have a decl for cexp create one. This is the
2779 friendliest fallback if the user calls __builtin_cexpi
2780 without full target C99 function support. */
2782 {
2783 tree fntype;
2795 }
2800 /* Make sure not to fold the cexp call again. */
2804 }
2806 /* Now build the proper return type. */
2811 }
2813 /* Conveniently construct a function call expression. FNDECL names the
2814 function to be called, N is the number of arguments, and the "..."
2815 parameters are the argument expressions. Unlike build_call_exr
2816 this doesn't fold the call, hence it will always return a CALL_EXPR. */
2818 static tree
2820 {
2830 }
2832 /* Expand a call to one of the builtin rounding functions gcc defines
2833 as an extension (lfloor and lceil). As these are gcc extensions we
2834 do not need to worry about setting errno to EDOM.
2835 If expanding via optab fails, lower expression to (int)(floor(x)).
2836 EXP is the expression that is a call to the builtin function;
2837 if convenient, the result should be placed in TARGET. */
2839 static rtx
2841 {
2842 convert_optab builtin_optab;
2847 tree fallback_fndecl;
2848 machine_mode mode;
2849 tree arg;
2857 {
2874 }
2876 /* Make a suitable register to place result in. */
2881 /* Wrap the computation of the argument in a SAVE_EXPR, as we may
2882 need to expand the argument again. This way, we will not perform
2883 side-effects more the once. */
2890 /* Compute into TARGET. */
2892 {
2893 /* Output the entire sequence. */
2898 }
2900 /* If we were unable to expand via the builtin, stop the sequence
2901 (without outputting the insns). */
2904 /* Fall back to floating point rounding optab. */
2907 /* For non-C99 targets we may end up without a fallback fndecl here
2908 if the user called __builtin_lfloor directly. In this case emit
2909 a call to the floor/ceil variants nevertheless. This should result
2910 in the best user experience for not full C99 targets. */
2912 {
2913 tree fntype;
2917 {
2950 }
2955 }
2962 /* Truncate the result of floating point optab to integer
2963 via expand_fix (). */
2968 }
2970 /* Expand a call to one of the builtin math functions doing integer
2971 conversion (lrint).
2972 Return 0 if a normal call should be emitted rather than expanding the
2973 function in-line. EXP is the expression that is a call to the builtin
2974 function; if convenient, the result should be placed in TARGET. */
2976 static rtx
2978 {
2979 convert_optab builtin_optab;
2980 rtx op0;
2983 tree arg;
2984 machine_mode mode;
2993 {
3012 }
3014 /* There's no easy way to detect the case we need to set EDOM. */
3018 /* Make a suitable register to place result in. */
3021 /* There's no easy way to detect the case we need to set EDOM. */
3023 {
3026 /* Wrap the computation of the argument in a SAVE_EXPR, as we may
3027 need to expand the argument again. This way, we will not perform
3028 side-effects more the once. */
3036 {
3037 /* Output the entire sequence. */
3042 }
3044 /* If we were unable to expand via the builtin, stop the sequence
3045 (without outputting the insns) and call to the library function
3046 with the stabilized argument list. */
3048 }
3051 {
3052 /* Fall back to rounding to long int. Use implicit_p 0 - for non-C99
3053 targets, (int) round (x) should never be transformed into
3054 BUILT_IN_IROUND and if __builtin_iround is called directly, emit
3055 a call to lround in the hope that the target provides at least some
3056 C99 functions. This should result in the best user experience for
3057 not full C99 targets. */
3058 tree fallback_fndecl = mathfn_built_in_1
3067 }
3070 }
3072 /* Expand a call to the powi built-in mathematical function. Return NULL_RTX if
3073 a normal call should be emitted rather than expanding the function
3074 in-line. EXP is the expression that is a call to the builtin
3075 function; if convenient, the result should be placed in TARGET. */
3077 static rtx
3079 {
3082 machine_mode mode;
3083 machine_mode mode2;
3092 /* Emit a libcall to libgcc. */
3094 /* Mode of the 2nd argument must match that of an int. */
3112 }
3114 /* Expand expression EXP which is a call to the strlen builtin. Return
3115 NULL_RTX if we failed and the caller should emit a normal call, otherwise
3116 try to get the result in TARGET, if convenient. */
3118 static rtx
3120 machine_mode target_mode)
3121 {
3129 /* If the length can be computed at compile-time, return it. */
3133 /* If the length can be computed at compile-time and is constant
3134 integer, but there are side-effects in src, evaluate
3135 src for side-effects, then return len.
3136 E.g. x = strlen (i++ ? "xfoo" + 1 : "bar");
3137 can be optimized into: i++; x = 3; */
3140 {
3143 }
3147 /* If SRC is not a pointer type, don't do this operation inline. */
3151 /* Bail out if we can't compute strlen in the right mode. */
3152 machine_mode insn_mode;
3155 {
3159 }
3163 /* Make a place to hold the source address. We will not expand
3164 the actual source until we are sure that the expansion will
3165 not fail -- there are trees that cannot be expanded twice. */
3168 /* Mark the beginning of the strlen sequence so we can emit the
3169 source operand later. */
3180 /* Check to see if the argument was declared attribute nonstring
3181 and if so, issue a warning since at this point it's not known
3182 to be nul-terminated. */
3185 /* Now that we are assured of success, expand the source. */
3189 {
3190 #ifdef POINTERS_EXTEND_UNSIGNED
3193 POINTERS_EXTEND_UNSIGNED);
3194 #endif
3196 }
3202 else
3205 /* Return the value in the proper mode for this function. */
3210 else
3214 }
3216 /* Expand call EXP to the strnlen built-in, returning the result
3217 and setting it in TARGET. Otherwise return NULL_RTX on failure. */
3219 static rtx
3221 {
3237 /* FIXME: Change c_strlen() to return sizetype instead of ssizetype
3238 so these conversions aren't necessary. */
3239 c_strlen_data lendata = { };
3245 {
3251 }
3262 {
3267 }
3277 }
3279 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
3280 bytes from bytes at DATA + OFFSET and return it reinterpreted as
3281 a target constant. */
3283 static rtx
3285 scalar_int_mode mode)
3286 {
3287 /* The REPresentation pointed to by DATA need not be a nul-terminated
3288 string but the caller guarantees it's large enough for MODE. */
3292 }
3294 /* LEN specify length of the block of memcpy/memset operation.
3295 Figure out its range and put it into MIN_SIZE/MAX_SIZE.
3296 In some cases we can make very likely guess on max size, then we
3297 set it into PROBABLE_MAX_SIZE. */
3299 static void
3304 {
3306 {
3309 }
3310 else
3311 {
3315 /* Determine bounds from the type. */
3318 else
3323 else
3329 {
3334 }
3336 {
3337 /* Code like
3339 int n;
3340 if (n < 100)
3341 memcpy (a, b, n)
3343 Produce anti range allowing negative values of N. We still
3344 can use the information and make a guess that N is not negative.
3345 */
3348 }
3349 }
3353 }
3355 /* Issue a warning OPT for a bounded call EXP with a bound in RANGE
3356 accessing an object with SIZE. */
3358 static bool
3361 {
3370 {
3372 {
3374 warned = (func
3376 "%K%qD specified bound %E "
3380 "%Kspecified bound %E "
3383 else
3384 warned = (func
3386 "%K%qD specified bound [%E, %E] "
3391 "%Kspecified bound [%E, %E] "
3394 }
3398 warned = (func
3400 "%K%qD specified bound %E exceeds "
3404 "%Kspecified bound %E exceeds "
3407 else
3408 warned = (func
3410 "%K%qD specified bound [%E, %E] exceeds "
3414 "%Kspecified bound [%E, %E] exceeds "
3418 {
3420 {
3427 }
3429 }
3432 }
3435 {
3437 warned = (func
3439 "%K%qD specified size %E "
3443 "%Kspecified size %E "
3446 else
3447 warned = (func
3449 "%K%qD specified size between %E and %E "
3454 "%Kspecified size between %E and %E "
3457 }
3461 warned = (func
3463 "%K%qD specified bound %E exceeds "
3467 "%Kspecified bound %E exceeds "
3470 else
3471 warned = (func
3473 "%K%qD specified bound [%E, %E] exceeds "
3477 "%Kspecified bound [%E, %E] exceeds "
3482 {
3487 }
3490 }
3492 /* For an expression EXP issue an access warning controlled by option OPT
3493 with access to a region SLEN bytes in size in the RANGE of sizes. */
3495 static bool
3498 {
3502 {
3504 warned = (func
3516 {
3517 /* Avoid printing the upper bound if it's invalid. */
3518 warned = (func
3520 "%K%qD reading %E or more bytes from a region "
3524 "%Kreading %E or more bytes from a region "
3527 }
3528 else
3529 warned = (func
3531 "%K%qD reading between %E and %E bytes from "
3535 "%Kreading between %E and %E bytes from "
3543 }
3546 warned = (func
3558 {
3559 /* Avoid printing the upper bound if it's invalid. */
3560 warned = (func
3562 "%K%qD expecting %E or more bytes in a region "
3566 "%Kexpecting %E or more bytes in a region "
3569 }
3570 else
3571 warned = (func
3573 "%K%qD expecting between %E and %E bytes in "
3577 "%Kexpectting between %E and %E bytes in "
3585 }
3587 /* Issue an inform message describing the target of an access REF.
3588 WRITE is set for a write access and clear for a read access. */
3590 static void
3592 {
3596 /* Convert offset range and avoid including a zero range since it isn't
3597 necessarily meaningful. */
3601 {
3604 }
3606 /* Convert size range and always include it since all sizes are
3607 meaningful. */
3611 {
3614 }
3617 location_t loc;
3620 {
3626 /* Handle calls through pointers to functions. */
3629 /* SIZRNG doesn't necessarily have the same range as the allocation
3630 size determined by gimple_call_alloc_size (). */
3634 else
3637 }
3638 else
3642 {
3644 {
3646 {
3649 else
3652 }
3653 else
3657 }
3660 {
3664 else
3666 "at offset %lli into destination object of size %s "
3668 }
3669 else
3671 "at offset [%lli, %lli] into destination object of size %s "
3676 }
3679 {
3681 {
3684 else
3687 }
3688 else
3692 }
3695 {
3699 else
3701 "at offset %lli into source object of size %s "
3703 }
3704 else
3706 "at offset [%lli, %lli] into source object of size %s "
3709 }
3711 /* Helper to set RANGE to the range of BOUND if it's nonnull, bounded
3712 by BNDRNG if nonnull and valid. */
3714 static void
3716 {
3724 {
3725 offset_int r[] =
3731 }
3732 else
3733 {
3736 }
3737 }
3739 /* Try to verify that the sizes and lengths of the arguments to a string
3740 manipulation function given by EXP are within valid bounds and that
3741 the operation does not lead to buffer overflow or read past the end.
3742 Arguments other than EXP may be null. When non-null, the arguments
3743 have the following meaning:
3744 DST is the destination of a copy call or NULL otherwise.
3745 SRC is the source of a copy call or NULL otherwise.
3746 DSTWRITE is the number of bytes written into the destination obtained
3747 from the user-supplied size argument to the function (such as in
3748 memcpy(DST, SRCs, DSTWRITE) or strncpy(DST, DRC, DSTWRITE).
3749 MAXREAD is the user-supplied bound on the length of the source sequence
3750 (such as in strncat(d, s, N). It specifies the upper limit on the number
3751 of bytes to write. If NULL, it's taken to be the same as DSTWRITE.
3752 SRCSTR is the source string (such as in strcpy(DST, SRC)) when the
3753 expression EXP is a string function call (as opposed to a memory call
3754 like memcpy). As an exception, SRCSTR can also be an integer denoting
3755 the precomputed size of the source string or object (for functions like
3756 memcpy).
3757 DSTSIZE is the size of the destination object.
3759 When DSTWRITE is null LEN is checked to verify that it doesn't exceed
3760 SIZE_MAX.
3762 ACCESS is true for accesses, false for simple size checks in calls
3763 to functions that neither read from nor write to the region.
3765 When nonnull, PAD points to a more detailed description of the access.
3767 If the call is successfully verified as safe return true, otherwise
3768 return false. */
3770 bool
3774 {
3775 /* The size of the largest object is half the address space, or
3776 PTRDIFF_MAX. (This is way too permissive.) */
3779 /* Either an approximate/minimum the length of the source string for
3780 string functions or the size of the source object for raw memory
3781 functions. */
3784 /* The range of the access in bytes; first set to the write access
3785 for functions that write and then read for those that also (or
3786 just) read. */
3789 /* Set to true when the exact number of bytes written by a string
3790 function like strcpy is not known and the only thing that is
3791 known is that it must be at least one (for the terminating nul). */
3794 {
3795 /* SRCSTR is normally a pointer to string but as a special case
3796 it can be an integer denoting the length of a string. */
3798 {
3801 /* Try to determine the range of lengths the source string
3802 refers to. If it can be determined and is less than
3803 the upper bound given by MAXREAD add one to it for
3804 the terminating nul. Otherwise, set it to one for
3805 the same reason, or to MAXREAD as appropriate. */
3806 c_strlen_data lendata = { };
3814 {
3817 else
3828 }
3829 else
3830 {
3833 }
3834 }
3835 else
3837 }
3840 {
3841 /* When the only available piece of data is the object size
3842 there is nothing to do. */
3846 /* Otherwise, when the length of the source sequence is known
3847 (as with strlen), set DSTWRITE to it. */
3850 }
3855 /* Set RANGE to that of DSTWRITE if non-null, bounded by PAD->DST.BNDRNG
3856 if valid. */
3861 /* First check the number of bytes to be written against the maximum
3862 object size. */
3866 {
3873 }
3875 /* The number of bytes to write is "exact" if DSTWRITE is non-null,
3876 constant, and in range of unsigned HOST_WIDE_INT. */
3879 /* Next check the number of bytes to be written against the destination
3880 object size. */
3882 {
3887 || (dstwrite
3890 {
3900 {
3901 /* This is a call to strcpy with a destination of 0 size
3902 and a source of unknown length. The call will write
3903 at least one byte past the end of the destination. */
3904 warned = (func
3906 "%K%qD writing %E or more bytes into "
3907 "a region of size %E overflows "
3911 "%Kwriting %E or more bytes into "
3912 "a region of size %E overflows "
3915 }
3917 warned = (func
3920 "%K%qD writing %E byte into a region "
3922 "%K%qD writing %E bytes into a region "
3927 "%Kwriting %E byte into a region "
3929 "%Kwriting %E bytes into a region "
3933 {
3934 /* Avoid printing the upper bound if it's invalid. */
3935 warned = (func
3937 "%K%qD writing %E or more bytes into "
3938 "a region of size %E overflows "
3942 "%Kwriting %E or more bytes into "
3943 "a region of size %E overflows "
3946 }
3947 else
3948 warned = (func
3950 "%K%qD writing between %E and %E bytes "
3951 "into a region of size %E overflows "
3954 dstsize)
3956 "%Kwriting between %E and %E bytes "
3957 "into a region of size %E overflows "
3960 dstsize));
3962 {
3966 }
3968 /* Return error when an overflow has been detected. */
3970 }
3971 }
3973 /* Check the maximum length of the source sequence against the size
3974 of the destination object if known, or against the maximum size
3975 of an object. */
3977 {
3978 /* Set RANGE to that of MAXREAD, bounded by PAD->SRC.BNDRNG if
3979 PAD is nonnull and BNDRNG is valid. */
3990 {
3992 {
3996 }
3999 {
4001 ? OPT_Wstringop_overflow_
4005 }
4006 }
4009 }
4011 /* Check for reading past the end of SRC. */
4014 && dstwrite
4020 {
4021 /* Set RANGE to that of MAXREAD, bounded by PAD->SRC.BNDRNG if
4022 PAD is nonnull and BNDRNG is valid. */
4024 /* Set OVERREAD for reads starting just past the end of an object. */
4028 }
4031 {
4045 }
4048 }
4050 /* A convenience wrapper for check_access above to check access
4051 by a read-only function like puts. */
4053 static bool
4056 {
4065 }
4067 /* If STMT is a call to an allocation function, returns the constant
4068 size of the object allocated by the call represented as sizetype.
4069 If nonnull, sets RNG1[] to the range of the size. */
4071 tree
4074 {
4078 tree allocfntype;
4081 else
4090 {
4095 }
4100 {
4111 {
4115 }
4116 }
4121 /* If RNG1 is not set, use the buffer. */
4131 /* To handle ranges do the math in wide_int and return the product
4132 of the upper bounds as a constant. Ignore anti-ranges. */
4138 /* Extend to the maximum precision to avoid overflow. */
4145 /* Compute products of both bounds for the caller but return the lesser
4146 of SIZE_MAX and the product of the upper bounds as a constant. */
4151 {
4154 }
4157 }
4159 /* Wrapper around the wide_int overload of get_range. Returns the same
4160 result but accepts offset_int instead. */
4162 static bool
4165 {
4173 }
4175 /* Helper to compute the size of the object referenced by the PTR
4176 expression which must have pointer type, using Object Size type
4177 OSTYPE (only the least significant 2 bits are used).
4178 On success, sets PREF->REF to the DECL of the referenced object
4179 if it's unique, otherwise to null, PREF->OFFRNG to the range of
4180 offsets into it, and PREF->SIZRNG to the range of sizes of
4181 the object(s).
4182 VISITED is used to avoid visiting the same PHI operand multiple
4183 times, and, when nonnull, RVALS to determine range information.
4184 Returns true on success, false when the size cannot be determined.
4186 The function is intended for diagnostics and should not be used
4187 to influence code generation or optimization. */
4189 static bool
4192 {
4198 {
4199 /* Bail if the reference is to the pointer itself (as opposed
4200 to what it points to). */
4211 }
4216 {
4220 {
4221 /* For raw memory functions like memcpy bail if the size
4222 of the enclosing object cannot be determined. */
4228 /* Otherwise, use the size of the enclosing object and add
4229 the offset of the member to the offset computed so far. */
4237 }
4239 /* Bail if the reference is to the pointer itself (as opposed
4240 to what it points to). */
4245 /* Only return constant sizes for now while callers depend
4246 on it. INT0LEN is true for interior zero-length arrays. */
4250 {
4253 }
4260 }
4263 {
4268 /* Avoid arrays of pointers. FIXME: Hande pointers to arrays
4269 of known bound. */
4273 {
4274 /* Give up for MEM_REFs of vector types; those may be synthesized
4275 from multiple assignments to consecutive data members. See PR
4276 93200.
4277 FIXME: Deal with this more generally, e.g., by marking up such
4278 MEM_REFs at the time they're created. */
4282 }
4290 /* Fail unless the size of the object is zero. */
4294 {
4295 /* Convert the array index range determined above to a byte
4296 offset. */
4299 {
4300 /* Adjust the index by the low bound of the array domain
4301 (normally zero but 1 in Fortran). */
4305 }
4317 {
4318 /* Execpt for the permissive raw memory functions which
4319 use the size of the whole object determined above,
4320 use the size of the referenced array. */
4323 }
4324 }
4330 }
4333 {
4336 {
4337 /* If STMT is a call to an allocation function get the size
4338 from its argument(s). If successful, also set *PDECL to
4339 PTR for the caller to include in diagnostics. */
4342 {
4347 }
4349 }
4351 /* TODO: Handle PHI. */
4360 /* Avoid conversions from non-pointers. */
4364 {
4365 /* If the the offset in the expression can be determined use
4366 it to adjust the overall offset. Otherwise, set the overall
4367 offset to the maximum. */
4371 {
4374 }
4378 }
4383 }
4392 {
4395 }
4398 }
4400 /* A "public" wrapper around the above. Clients should use this overload
4401 instead. */
4403 static tree
4406 {
4409 bool success
4419 {
4425 }
4428 {
4433 }
4439 }
4441 /* Transitional wrapper around the above. The function should be removed
4442 once callers transition to one of the two above. */
4444 tree
4447 {
4448 /* Set the initial offsets to zero and size to negative to indicate
4449 none has been computed yet. */
4450 access_ref ref;
4462 }
4464 /* Helper to determine and check the sizes of the source and the destination
4465 of calls to __builtin_{bzero,memcpy,mempcpy,memset} calls. EXP is the
4466 call expression, DEST is the destination argument, SRC is the source
4467 argument or null, and LEN is the number of bytes. Use Object Size type-0
4468 regardless of the OPT_Wstringop_overflow_ setting. Return true on success
4469 (no overflow or invalid sizes), false otherwise. */
4471 static bool
4473 {
4474 /* For functions like memset and memcpy that operate on raw memory
4475 try to determine the size of the largest source and destination
4476 object using type-0 Object Size regardless of the object size
4477 type specified by the option. */
4484 }
4486 /* Validate memchr arguments without performing any expansion.
4487 Return NULL_RTX. */
4489 static rtx
4491 {
4502 }
4504 /* Expand a call EXP to the memcpy builtin.
4505 Return NULL_RTX if we failed, the caller should emit a normal call,
4506 otherwise try to get the result in TARGET, if convenient (and in
4507 mode MODE if that's convenient). */
4509 static rtx
4511 {
4524 }
4526 /* Check a call EXP to the memmove built-in for validity.
4527 Return NULL_RTX on both success and failure. */
4529 static rtx
4531 {
4544 }
4546 /* Expand a call EXP to the mempcpy builtin.
4547 Return NULL_RTX if we failed; the caller should emit a normal call,
4548 otherwise try to get the result in TARGET, if convenient (and in
4549 mode MODE if that's convenient). */
4551 static rtx
4553 {
4562 /* Policy does not generally allow using compute_objsize (which
4563 is used internally by check_memop_size) to change code generation
4564 or drive optimization decisions.
4566 In this instance it is safe because the code we generate has
4567 the same semantics regardless of the return value of
4568 check_memop_sizes. Exactly the same amount of data is copied
4569 and the return value is exactly the same in both cases.
4571 Furthermore, check_memop_size always uses mode 0 for the call to
4572 compute_objsize, so the imprecise nature of compute_objsize is
4573 avoided. */
4575 /* Avoid expanding mempcpy into memcpy when the call is determined
4576 to overflow the buffer. This also prevents the same overflow
4577 from being diagnosed again when expanding memcpy. */
4583 }
4585 /* Helper function to do the actual work for expand of memory copy family
4586 functions (memcpy, mempcpy, stpcpy). Expansing should assign LEN bytes
4587 of memory from SRC to DEST and assign to TARGET if convenient. Return
4588 value is based on RETMODE argument. */
4590 static rtx
4594 {
4606 /* If DEST is not a pointer type, call the normal function. */
4610 /* If either SRC is not a pointer type, don't do this
4611 operation in-line. */
4627 /* Try to get the byte representation of the constant SRC points to,
4628 with its byte size in NBYTES. */
4632 /* If the function's constant bound LEN_RTX is less than or equal
4633 to the byte size of the representation of the constant argument,
4634 and if block move would be done by pieces, we can avoid loading
4635 the bytes from memory and only store the computed constant.
4636 This works in the overlap (memmove) case as well because
4637 store_by_pieces just generates a series of stores of constants
4638 from the representation returned by getbyterep(). */
4645 {
4647 builtin_memcpy_read_str,
4653 }
4658 /* Copy word part most expediently. */
4665 && !might_overlap
4673 might_overlap);
4675 /* Bail out when a mempcpy call would be expanded as libcall and when
4676 we have a target that provides a fast implementation
4677 of mempcpy routine. */
4685 {
4688 }
4691 {
4693 /* stpcpy pointer to last byte. */
4696 }
4699 }
4701 static rtx
4704 {
4707 }
4709 /* Expand into a movstr instruction, if one is available. Return NULL_RTX if
4710 we failed, the caller should emit a normal call, otherwise try to
4711 get the result in TARGET, if convenient.
4712 Return value is based on RETMODE argument. */
4714 static rtx
4716 {
4718 rtx dest_mem;
4719 rtx src_mem;
4727 {
4730 }
4740 {
4742 /* movstr is supposed to set end to the address of the NUL
4743 terminator. If the caller requested a mempcpy-like return value,
4744 adjust it. */
4746 {
4750 }
4751 }
4753 }
4755 /* Do some very basic size validation of a call to the strcpy builtin
4756 given by EXP. Return NULL_RTX to have the built-in expand to a call
4757 to the library function. */
4759 static rtx
4761 {
4769 /* There is no way here to determine the length of the string in
4770 the destination to which the SRC string is being appended so
4771 just diagnose cases when the souce string is longer than
4772 the destination object. */
4783 }
4785 /* Expand expression EXP, which is a call to the strcpy builtin. Return
4786 NULL_RTX if we failed the caller should emit a normal call, otherwise
4787 try to get the result in TARGET, if convenient (and in mode MODE if that's
4788 convenient). */
4790 static rtx
4792 {
4800 {
4809 }
4812 {
4813 /* Check to see if the argument was declared attribute nonstring
4814 and if so, issue a warning since at this point it's not known
4815 to be nul-terminated. */
4819 }
4822 }
4824 /* Helper function to do the actual work for expand_builtin_strcpy. The
4825 arguments to the builtin_strcpy call DEST and SRC are broken out
4826 so that this can also be called without constructing an actual CALL_EXPR.
4827 The other arguments and return value are the same as for
4828 expand_builtin_strcpy. */
4830 static rtx
4832 {
4833 /* Detect strcpy calls with unterminated arrays.. */
4834 tree size;
4837 {
4838 /* NONSTR refers to the non-nul terminated constant array. */
4842 }
4845 }
4847 /* Expand a call EXP to the stpcpy builtin.
4848 Return NULL_RTX if we failed the caller should emit a normal call,
4849 otherwise try to get the result in TARGET, if convenient (and in
4850 mode MODE if that's convenient). */
4852 static rtx
4854 {
4865 {
4871 }
4873 /* If return value is ignored, transform stpcpy into strcpy. */
4875 {
4879 }
4880 else
4881 {
4883 rtx ret;
4885 /* Ensure we get an actual string whose length can be evaluated at
4886 compile-time, not an expression containing a string. This is
4887 because the latter will potentially produce pessimized code
4888 when used to produce the return value. */
4889 c_strlen_data lendata = { };
4907 {
4911 {
4915 {
4917 {
4920 else
4922 }
4931 }
4932 }
4933 }
4937 }
4938 }
4940 /* Expand a call EXP to the stpcpy builtin and diagnose uses of nonstring
4941 arguments while being careful to avoid duplicate warnings (which could
4942 be issued if the expander were to expand the call, resulting in it
4943 being emitted in expand_call(). */
4945 static rtx
4947 {
4949 {
4950 /* The call has been successfully expanded. Check for nonstring
4951 arguments and issue warnings as appropriate. */
4954 }
4957 }
4959 /* Check a call EXP to the stpncpy built-in for validity.
4960 Return NULL_RTX on both success and failure. */
4962 static rtx
4964 {
4970 /* The source and destination of the call. */
4974 /* The exact number of bytes to write (not the maximum). */
4977 /* The size of the destination object. */
4982 }
4984 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
4985 bytes from constant string DATA + OFFSET and return it as target
4986 constant. */
4988 rtx
4990 scalar_int_mode mode)
4991 {
4998 }
5000 /* Helper to check the sizes of sequences and the destination of calls
5001 to __builtin_strncat and __builtin___strncat_chk. Returns true on
5002 success (no overflow or invalid sizes), false otherwise. */
5004 static bool
5006 {
5011 /* Try to determine the range of lengths that the source expression
5012 refers to. */
5013 c_strlen_data lendata = { };
5016 /* Try to verify that the destination is big enough for the shortest
5017 string. */
5021 {
5022 /* If it hasn't been provided by __strncat_chk, try to determine
5023 the size of the destination object into which the source is
5024 being copied. */
5026 }
5028 /* Add one for the terminating nul. */
5031 size_one_node)
5034 /* The strncat function copies at most MAXREAD bytes and always appends
5035 the terminating nul so the specified upper bound should never be equal
5036 to (or greater than) the size of the destination. */
5039 {
5048 }
5056 /* The number of bytes to write is LEN but check_access will alsoa
5057 check SRCLEN if LEN's value isn't known. */
5060 }
5062 /* Similar to expand_builtin_strcat, do some very basic size validation
5063 of a call to the strcpy builtin given by EXP. Return NULL_RTX to have
5064 the built-in expand to a call to the library function. */
5066 static rtx
5068 {
5076 /* The upper bound on the number of bytes to write. */
5079 /* Detect unterminated source (only). */
5083 /* The length of the source sequence. */
5086 /* Try to determine the range of lengths that the source expression
5087 refers to. Since the lengths are only used for warning and not
5088 for code generation disable strict mode below. */
5091 {
5092 c_strlen_data lendata = { };
5095 }
5098 /* Try to verify that the destination is big enough for the shortest
5099 string. First try to determine the size of the destination object
5100 into which the source is being copied. */
5103 /* Add one for the terminating nul. */
5104 tree srclen = (maxlen
5106 size_one_node)
5109 /* The strncat function copies at most MAXREAD bytes and always appends
5110 the terminating nul so the specified upper bound should never be equal
5111 to (or greater than) the size of the destination. */
5114 {
5123 }
5135 }
5137 /* Expand expression EXP, which is a call to the strncpy builtin. Return
5138 NULL_RTX if we failed the caller should emit a normal call. */
5140 static rtx
5142 {
5150 /* The number of bytes to write (not the maximum). */
5153 /* The length of the source sequence. */
5157 {
5162 /* The number of bytes to write is LEN but check_access will also
5163 check SLEN if LEN's value isn't known. */
5166 }
5168 /* We must be passed a constant len and src parameter. */
5174 /* We're required to pad with trailing zeros if the requested
5175 len is greater than strlen(s2)+1. In that case try to
5176 use store_by_pieces, if it fails, punt. */
5178 {
5181 rtx dest_mem;
5185 builtin_strncpy_read_str,
5192 builtin_strncpy_read_str,
5194 RETURN_BEGIN);
5198 }
5201 }
5203 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
5204 bytes from constant string DATA + OFFSET and return it as target
5205 constant. */
5207 rtx
5209 scalar_int_mode mode)
5210 {
5217 }
5219 /* Callback routine for store_by_pieces. Return the RTL of a register
5220 containing GET_MODE_SIZE (MODE) consecutive copies of the unsigned
5221 char value given in the RTL register data. For example, if mode is
5222 4 bytes wide, return the RTL for 0x01010101*data. */
5224 static rtx
5226 scalar_int_mode mode)
5227 {
5243 }
5245 /* Expand expression EXP, which is a call to the memset builtin. Return
5246 NULL_RTX if we failed the caller should emit a normal call, otherwise
5247 try to get the result in TARGET, if convenient (and in mode MODE if that's
5248 convenient). */
5250 static rtx
5252 {
5264 }
5266 /* Helper function to do the actual work for expand_builtin_memset. The
5267 arguments to the builtin_memset call DEST, VAL, and LEN are broken out
5268 so that this can also be called without constructing an actual CALL_EXPR.
5269 The other arguments and return value are the same as for
5270 expand_builtin_memset. */
5272 static rtx
5275 {
5278 machine_mode val_mode;
5290 /* If DEST is not a pointer type, don't do this operation in-line. */
5301 /* If the LEN parameter is zero, return DEST. */
5303 {
5304 /* Evaluate and ignore VAL in case it has side-effects. */
5307 }
5309 /* Stabilize the arguments in case we fail. */
5321 {
5322 rtx val_rtx;
5327 /* Assume that we can memset by pieces if we can store
5328 * the coefficients by pieces (in the required modes).
5329 * We can't pass builtin_memset_gen_str as that emits RTL. */
5335 {
5340 }
5344 probable_max_size))
5350 }
5356 {
5363 RETURN_BEGIN);
5368 probable_max_size))
5374 }
5382 probable_max_size);
5385 {
5388 }
5392 do_libcall:
5401 else
5406 }
5408 /* Expand expression EXP, which is a call to the bzero builtin. Return
5409 NULL_RTX if we failed the caller should emit a normal call. */
5411 static rtx
5413 {
5422 /* New argument list transforming bzero(ptr x, int y) to
5423 memset(ptr x, int 0, size_t y). This is done this way
5424 so that if it isn't expanded inline, we fallback to
5425 calling bzero instead of memset. */
5433 }
5435 /* Try to expand cmpstr operation ICODE with the given operands.
5436 Return the result rtx on success, otherwise return null. */
5438 static rtx
5440 HOST_WIDE_INT align)
5441 {
5455 }
5457 /* Expand expression EXP, which is a call to the memcmp built-in function.
5458 Return NULL_RTX if we failed and the caller should emit a normal call,
5459 otherwise try to get the result in TARGET, if convenient.
5460 RESULT_EQ is true if we can relax the returned value to be either zero
5461 or nonzero, without caring about the sign. */
5463 static rtx
5465 {
5474 /* Diagnose calls where the specified length exceeds the size of either
5475 object. */
5480 /* Due to the performance benefit, always inline the calls first
5481 when result_eq is false. */
5485 {
5489 }
5497 /* If we don't have POINTER_TYPE, call the function. */
5505 /* Set MEM_SIZE as appropriate. */
5507 {
5510 }
5514 /* Try to get the byte representation of the constant ARG2 (or, only
5515 when the function's result is used for equality to zero, ARG1)
5516 points to, with its byte size in NBYTES. */
5520 {
5521 /* For equality to zero the arguments are interchangeable. */
5525 }
5527 /* If the function's constant bound LEN_RTX is less than or equal
5528 to the byte size of the representation of the constant argument,
5529 and if block move would be done by pieces, we can avoid loading
5530 the bytes from memory and only store the computed constant result. */
5542 {
5543 /* Return the value in the proper mode for this function. */
5548 {
5551 }
5554 }
5557 }
5559 /* Expand expression EXP, which is a call to the strcmp builtin. Return NULL_RTX
5560 if we failed the caller should emit a normal call, otherwise try to get
5561 the result in TARGET, if convenient. */
5563 static rtx
5565 {
5576 /* Due to the performance benefit, always inline the calls first. */
5590 /* If we don't have POINTER_TYPE, call the function. */
5594 /* Stabilize the arguments in case gen_cmpstr(n)si fail. */
5601 /* Try to call cmpstrsi. */
5606 /* Try to determine at least one length and call cmpstrnsi. */
5608 {
5609 tree len;
5610 rtx arg3_rtx;
5620 /* If we don't have a constant length for the first, use the length
5621 of the second, if we know it. We don't require a constant for
5622 this case; some cost analysis could be done if both are available
5623 but neither is constant. For now, assume they're equally cheap,
5624 unless one has side effects. If both strings have constant lengths,
5625 use the smaller. */
5641 else
5644 /* If both arguments have side effects, we cannot optimize. */
5646 {
5648 result = expand_cmpstrn_or_cmpmem
5651 }
5652 }
5656 {
5657 /* Check to see if the argument was declared attribute nonstring
5658 and if so, issue a warning since at this point it's not known
5659 to be nul-terminated. */
5662 /* Return the value in the proper mode for this function. */
5670 }
5672 /* Expand the library call ourselves using a stabilized argument
5673 list to avoid re-evaluating the function's arguments twice. */
5678 }
5680 /* Expand expression EXP, which is a call to the strncmp builtin. Return
5681 NULL_RTX if we failed the caller should emit a normal call, otherwise
5682 try to get the result in TARGET, if convenient. */
5684 static rtx
5686 ATTRIBUTE_UNUSED machine_mode mode)
5687 {
5707 {
5708 /* Check to see if the argument was declared attribute nonstring
5709 and if so, issue a warning since at this point it's not known
5710 to be nul-terminated. */
5713 {
5714 /* A strncmp read is constrained not just by the bound but
5715 also by the length of the shorter string. Specifying
5716 a bound that's larger than the size of either array makes
5717 no sense and is likely a bug. When the length of neither
5718 of the two strings is known but the sizes of both of
5719 the arrays they are stored in is, issue a warning if
5720 the bound is larger than than the size of the larger
5721 of the two arrays. */
5734 {
5740 }
5747 }
5748 }
5750 /* Due to the performance benefit, always inline the calls first. */
5756 /* If c_strlen can determine an expression for one of the string
5757 lengths, and it doesn't have side effects, then emit cmpstrnsi
5758 using length MIN(strlen(string)+1, arg3). */
5763 tree len;
5775 /* If we don't have a constant length for the first, use the length
5776 of the second, if we know it. If neither string is constant length,
5777 use the given length argument. We don't require a constant for
5778 this case; some cost analysis could be done if both are available
5779 but neither is constant. For now, assume they're equally cheap,
5780 unless one has side effects. If both strings have constant lengths,
5781 use the smaller. */
5799 else
5802 /* If we are not using the given length, we must incorporate it here.
5803 The actual new length parameter will be MIN(len,arg3) in this case. */
5805 {
5808 }
5818 {
5819 /* Return the value in the proper mode for this function. */
5827 }
5829 /* Expand the library call ourselves using a stabilized argument
5830 list to avoid re-evaluating the function's arguments twice. */
5837 }
5839 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
5840 if that's convenient. */
5842 rtx
5844 {
5845 rtx val;
5848 /* Don't do __builtin_saveregs more than once in a function.
5849 Save the result of the first call and reuse it. */
5853 /* When this function is called, it means that registers must be
5854 saved on entry to this function. So we migrate the call to the
5855 first insn of this function. */
5859 /* Do whatever the machine needs done in this case. */
5867 /* Put the insns after the NOTE that starts the function. If this
5868 is inside a start_sequence, make the outer-level insn chain current, so
5869 the code is placed at the start of the function. */
5875 }
5877 /* Expand a call to __builtin_next_arg. */
5879 static rtx
5881 {
5882 /* Checking arguments is already done in fold_builtin_next_arg
5883 that must be called before this function. */
5888 }
5890 /* Make it easier for the backends by protecting the valist argument
5891 from multiple evaluations. */
5893 static tree
5895 {
5898 /* The current way of determining the type of valist is completely
5899 bogus. We should have the information on the va builtin instead. */
5904 {
5908 /* For this case, the backends will be expecting a pointer to
5909 vatype, but it's possible we've actually been given an array
5910 (an actual TARGET_CANONICAL_VA_LIST_TYPE (valist)).
5911 So fix it. */
5913 {
5916 }
5917 }
5918 else
5919 {
5923 {
5929 }
5935 }
5938 }
5940 /* The "standard" definition of va_list is void*. */
5942 tree
5944 {
5946 }
5948 /* The "standard" abi va_list is va_list_type_node. */
5950 tree
5952 {
5954 }
5956 /* The "standard" type of va_list is va_list_type_node. */
5958 tree
5960 {
5967 {
5968 /* If va_list is an array type, the argument may have decayed
5969 to a pointer type, e.g. by being passed to another function.
5970 In that case, unwrap both types so that we can compare the
5971 underlying records. */
5974 {
5977 }
5978 }
5983 }
5985 /* The "standard" implementation of va_start: just assign `nextarg' to
5986 the variable. */
5988 void
5990 {
5993 }
5995 /* Expand EXP, a call to __builtin_va_start. */
5997 static rtx
5999 {
6000 rtx nextarg;
6001 tree valist;
6005 {
6008 }
6018 else
6022 }
6024 /* Expand EXP, a call to __builtin_va_end. */
6026 static rtx
6028 {
6031 /* Evaluate for side effects, if needed. I hate macros that don't
6032 do that. */
6037 }
6039 /* Expand EXP, a call to __builtin_va_copy. We do this as a
6040 builtin rather than just as an assignment in stdarg.h because of the
6041 nastiness of array-type va_list types. */
6043 static rtx
6045 {
6058 {
6062 }
6063 else
6064 {
6067 /* Evaluate to pointers. */
6076 /* "Dereference" to BLKmode memories. */
6084 /* Copy. */
6086 }
6089 }
6091 /* Expand a call to one of the builtin functions __builtin_frame_address or
6092 __builtin_return_address. */
6094 static rtx
6096 {
6097 /* The argument must be a nonnegative integer constant.
6098 It counts the number of frames to scan up the stack.
6099 The value is either the frame pointer value or the return
6100 address saved in that frame. */
6102 /* Warning about missing arg was already issued. */
6105 {
6108 }
6109 else
6110 {
6111 /* Number of frames to scan up the stack. */
6116 /* Some ports cannot access arbitrary stack frames. */
6118 {
6121 }
6124 {
6125 /* Warn since no effort is made to ensure that any frame
6126 beyond the current one exists or can be safely reached. */
6129 }
6131 /* For __builtin_frame_address, return what we've got. */
6139 }
6140 }
6142 /* Expand EXP, a call to the alloca builtin. Return NULL_RTX if we
6143 failed and the caller should emit a normal call. */
6145 static rtx
6147 {
6148 rtx op0;
6149 rtx result;
6152 HOST_WIDE_INT max_size;
6155 bool valid_arglist
6158 VOID_TYPE)
6169 || (!alloca_for_var
6172 ))
6173 {
6174 /* -Walloca-larger-than and -Wvla-larger-than settings of
6175 less than HOST_WIDE_INT_MAX override the more general
6176 -Walloc-size-larger-than so unless either of the former
6177 options is smaller than the last one (wchich would imply
6178 that the call was already checked), check the alloca
6179 arguments for overflow. */
6183 }
6185 /* Compute the argument. */
6188 /* Compute the alignment. */
6190 ? BIGGEST_ALIGNMENT
6193 /* Compute the maximum size. */
6198 /* Allocate the desired space. If the allocation stems from the declaration
6199 of a variable-sized object, it cannot accumulate. */
6200 result
6204 /* Dynamic allocations for variables are recorded during gimplification. */
6209 }
6211 /* Emit a call to __asan_allocas_unpoison call in EXP. Add to second argument
6212 of the call virtual_stack_dynamic_rtx - stack_pointer_rtx, which is the
6213 STACK_DYNAMIC_OFFSET value. See motivation for this in comment to
6214 handle_builtin_stack_restore function. */
6216 static rtx
6218 {
6225 OPTAB_LIB_WIDEN);
6228 OPTAB_LIB_WIDEN);
6233 }
6235 /* Expand a call to bswap builtin in EXP.
6236 Return NULL_RTX if a normal call should be emitted rather than expanding the
6237 function in-line. If convenient, the result should be placed in TARGET.
6238 SUBTARGET may be used as the target for computing one of EXP's operands. */
6240 static rtx
6242 rtx subtarget)
6243 {
6244 tree arg;
6245 rtx op0;
6263 }
6265 /* Expand a call to a unary builtin in EXP.
6266 Return NULL_RTX if a normal call should be emitted rather than expanding the
6267 function in-line. If convenient, the result should be placed in TARGET.
6268 SUBTARGET may be used as the target for computing one of EXP's operands. */
6270 static rtx
6273 {
6274 rtx op0;
6279 /* Compute the argument. */
6281 (subtarget
6285 /* Compute op, into TARGET if possible.
6286 Set TARGET to wherever the result comes back. */
6292 }
6294 /* Expand a call to __builtin_expect. We just return our argument
6295 as the builtin_expect semantic should've been already executed by
6296 tree branch prediction pass. */
6298 static rtx
6300 {
6301 tree arg;
6308 /* When guessing was done, the hints should be already stripped away. */
6312 }
6314 /* Expand a call to __builtin_expect_with_probability. We just return our
6315 argument as the builtin_expect semantic should've been already executed by
6316 tree branch prediction pass. */
6318 static rtx
6320 {
6321 tree arg;
6328 /* When guessing was done, the hints should be already stripped away. */
6332 }
6335 /* Expand a call to __builtin_assume_aligned. We just return our first
6336 argument as the builtin_assume_aligned semantic should've been already
6337 executed by CCP. */
6339 static rtx
6341 {
6345 EXPAND_NORMAL);
6350 }
6352 void
6354 {
6356 {
6358 /* For trap insns when not accumulating outgoing args force
6359 REG_ARGS_SIZE note to prevent crossjumping of calls with
6360 different args sizes. */
6363 }
6364 else
6365 {
6369 }
6372 }
6374 /* Expand a call to __builtin_unreachable. We do nothing except emit
6375 a barrier saying that control flow will not pass here.
6377 It is the responsibility of the program being compiled to ensure
6378 that control flow does never reach __builtin_unreachable. */
6379 static void
6381 {
6383 }
6385 /* Expand EXP, a call to fabs, fabsf or fabsl.
6386 Return NULL_RTX if a normal call should be emitted rather than expanding
6387 the function inline. If convenient, the result should be placed
6388 in TARGET. SUBTARGET may be used as the target for computing
6389 the operand. */
6391 static rtx
6393 {
6394 machine_mode mode;
6395 tree arg;
6396 rtx op0;
6406 }
6408 /* Expand EXP, a call to copysign, copysignf, or copysignl.
6409 Return NULL is a normal call should be emitted rather than expanding the
6410 function inline. If convenient, the result should be placed in TARGET.
6411 SUBTARGET may be used as the target for computing the operand. */
6413 static rtx
6415 {
6417 tree arg;
6429 }
6431 /* Expand a call to __builtin___clear_cache. */
6433 static rtx
6435 {
6437 {
6438 #ifdef CLEAR_INSN_CACHE
6439 /* There is no "clear_cache" insn, and __clear_cache() in libgcc
6440 does something. Just do the default expansion to a call to
6441 __clear_cache(). */
6443 #else
6444 /* There is no "clear_cache" insn, and __clear_cache() in libgcc
6445 does nothing. There is no need to call it. Do nothing. */
6448 }
6450 /* We have a "clear_cache" insn, and it will handle everything. */
6454 /* We must not expand to a library call. If we did, any
6455 fallback library function in libgcc that might contain a call to
6456 __builtin___clear_cache() would recurse infinitely. */
6458 {
6461 }
6464 {
6477 }
6479 }
6481 /* Given a trampoline address, make sure it satisfies TRAMPOLINE_ALIGNMENT. */
6483 static rtx
6485 {
6488 /* If we don't need too much alignment, we'll have been guaranteed
6489 proper alignment by get_trampoline_type. */
6493 /* Round address up to desired boundary. */
6504 }
6506 static rtx
6508 {
6524 /* If ONSTACK, the TRAMP argument should be the address of a field
6525 within the local function's FRAME decl. Either way, let's see if
6526 we can fill in the MEM_ATTRs for this memory. */
6530 /* Creator of a heap trampoline is responsible for making sure the
6531 address is aligned to at least STACK_BOUNDARY. Normally malloc
6532 will ensure this anyhow. */
6535 {
6539 }
6541 /* The FUNC argument should be the address of the nested function.
6542 Extract the actual function decl to pass to the hook. */
6549 /* Generate insns to initialize the trampoline. */
6553 {
6559 }
6562 }
6564 static rtx
6566 {
6567 rtx tramp;
6578 }
6580 /* Expand a call to the builtin descriptor initialization routine.
6581 A descriptor is made up of a couple of pointers to the static
6582 chain and the code entry in this order. */
6584 static rtx
6586 {
6591 VOID_TYPE))
6606 /* Generate insns to initialize the descriptor. */
6612 }
6614 /* Expand a call to the builtin descriptor adjustment routine. */
6616 static rtx
6618 {
6619 rtx tramp;
6626 /* Unalign the descriptor to allow runtime identification. */
6631 }
6633 /* Expand the call EXP to the built-in signbit, signbitf or signbitl
6634 function. The function first checks whether the back end provides
6635 an insn to implement signbit for the respective mode. If not, it
6636 checks whether the floating point format of the value is such that
6637 the sign bit can be extracted. If that is not the case, error out.
6638 EXP is the expression that is a call to the builtin function; if
6639 convenient, the result should be placed in TARGET. */
6640 static rtx
6642 {
6644 scalar_float_mode fmode;
6646 tree arg;
6649 rtx temp;
6662 /* Expand the argument yielding a RTX expression. */
6665 /* Check if the back end provides an insn that handles signbit for the
6666 argument's mode. */
6669 {
6675 }
6677 /* For floating point formats without a sign bit, implement signbit
6678 as "ARG < 0.0". */
6681 {
6682 /* But we can't do this if the format supports signed zero. */
6688 }
6691 {
6694 }
6695 else
6696 {
6698 /* Handle targets with different FP word orders. */
6701 else
6705 }
6707 /* Force the intermediate word_mode (or narrower) result into a
6708 register. This avoids attempting to create paradoxical SUBREGs
6709 of floating point modes below. */
6712 /* If the bitpos is within the "result mode" lowpart, the operation
6713 can be implement with a single bitwise AND. Otherwise, we need
6714 a right shift and an AND. */
6717 {
6725 }
6726 else
6727 {
6728 /* Perform a logical right shift to place the signbit in the least
6729 significant bit, then truncate the result to the desired mode
6730 and mask just this bit. */
6735 }
6738 }
6740 /* Expand fork or exec calls. TARGET is the desired target of the
6741 call. EXP is the call. FN is the
6742 identificator of the actual function. IGNORE is nonzero if the
6743 value is to be ignored. */
6745 static rtx
6747 {
6749 tree call;
6752 {
6754 /* Detect unterminated path. */
6758 /* Also detect unterminated first argument. */
6760 {
6768 }
6769 }
6772 /* If we are not profiling, just call the function. */
6776 /* Otherwise call the wrapper. This should be equivalent for the rest of
6777 compiler, so the code does not diverge, and the wrapper may run the
6778 code necessary for keeping the profiling sane. */
6781 {
6812 }
6824 }
6827 \f
6828 /* Reconstitute a mode for a __sync intrinsic operation. Since the type of
6829 the pointer in these functions is void*, the tree optimizers may remove
6830 casts. The mode computed in expand_builtin isn't reliable either, due
6831 to __sync_bool_compare_and_swap.
6833 FCODE_DIFF should be fcode - base, where base is the FOO_1 code for the
6834 group of builtins. This gives us log2 of the mode size. */
6838 {
6839 /* The size is not negotiable, so ask not to get BLKmode in return
6840 if the target indicates that a smaller size would be better. */
6842 }
6844 /* Expand the memory expression LOC and return the appropriate memory operand
6845 for the builtin_sync operations. */
6847 static rtx
6849 {
6859 /* Note that we explicitly do not want any alias information for this
6860 memory, so that we kill all other live memories. Otherwise we don't
6861 satisfy the full barrier semantics of the intrinsic. */
6868 /* The alignment needs to be at least according to that of the mode. */
6875 }
6877 /* Make sure an argument is in the right mode.
6878 EXP is the tree argument.
6879 MODE is the mode it should be in. */
6881 static rtx
6883 {
6884 rtx val;
6885 machine_mode old_mode;
6889 {
6890 /* Undo argument promotion if possible, as combine might not
6891 be able to do it later due to MEM_VOLATILE_P uses in the
6892 patterns. */
6895 {
6905 }
6906 }
6909 /* If VAL is promoted to a wider mode, convert it back to MODE. Take care
6910 of CONST_INTs, where we know the old_mode only from the call argument. */
6917 }
6920 /* Expand the __sync_xxx_and_fetch and __sync_fetch_and_xxx intrinsics.
6921 EXP is the CALL_EXPR. CODE is the rtx code
6922 that corresponds to the arithmetic or logical operation from the name;
6923 an exception here is that NOT actually means NAND. TARGET is an optional
6924 place for us to store the results; AFTER is true if this is the
6925 fetch_and_xxx form. */
6927 static rtx
6930 rtx target)
6931 {
6936 {
6943 {
6972 }
6973 }
6975 /* Expand the operands. */
6980 after);
6981 }
6983 /* Expand the __sync_val_compare_and_swap and __sync_bool_compare_and_swap
6984 intrinsics. EXP is the CALL_EXPR. IS_BOOL is
6985 true if this is the boolean form. TARGET is a place for us to store the
6986 results; this is NOT optional if IS_BOOL is true. */
6988 static rtx
6991 {
6995 /* Expand the operands. */
7002 {
7005 else
7007 }
7010 MEMMODEL_SYNC_SEQ_CST))
7014 }
7016 /* Expand the __sync_lock_test_and_set intrinsic. Note that the most
7017 general form is actually an atomic exchange, and some targets only
7018 support a reduced form with the second argument being a constant 1.
7019 EXP is the CALL_EXPR; TARGET is an optional place for us to store
7020 the results. */
7022 static rtx
7024 rtx target)
7025 {
7028 /* Expand the operands. */
7033 }
7035 /* Expand the __sync_lock_release intrinsic. EXP is the CALL_EXPR. */
7037 static void
7039 {
7040 rtx mem;
7042 /* Expand the operands. */
7046 }
7048 /* Given an integer representing an ``enum memmodel'', verify its
7049 correctness and return the memory model enum. */
7051 static enum memmodel
7053 {
7054 rtx op;
7056 location_t loc
7059 /* If the parameter is not a constant, it's a run time value so we'll just
7060 convert it to MEMMODEL_SEQ_CST to avoid annoying runtime checking. */
7070 {
7074 }
7076 /* Should never see a user explicit SYNC memodel model, so >= LAST works. */
7078 {
7082 }
7084 /* Workaround for Bugzilla 59448. GCC doesn't track consume properly, so
7085 be conservative and promote consume to acquire. */
7090 }
7092 /* Expand the __atomic_exchange intrinsic:
7093 TYPE __atomic_exchange (TYPE *object, TYPE desired, enum memmodel)
7094 EXP is the CALL_EXPR.
7095 TARGET is an optional place for us to store the results. */
7097 static rtx
7099 {
7108 /* Expand the operands. */
7113 }
7115 /* Expand the __atomic_compare_exchange intrinsic:
7116 bool __atomic_compare_exchange (TYPE *object, TYPE *expect,
7117 TYPE desired, BOOL weak,
7118 enum memmodel success,
7119 enum memmodel failure)
7120 EXP is the CALL_EXPR.
7121 TARGET is an optional place for us to store the results. */
7123 static rtx
7125 rtx target)
7126 {
7130 tree weak;
7132 location_t loc
7139 {
7141 "failure memory model cannot be stronger than success "
7144 }
7147 {
7149 "invalid failure memory model for "
7153 }
7159 /* Expand the operands. */
7175 /* Lest the rtl backend create a race condition with an imporoper store
7176 to memory, always create a new pseudo for OLDVAL. */
7183 /* Conditionally store back to EXPECT, lest we create a race condition
7184 with an improper store to memory. */
7185 /* ??? With a rearrangement of atomics at the gimple level, we can handle
7186 the normal case where EXPECT is totally private, i.e. a register. At
7187 which point the store can be unconditional. */
7195 }
7197 /* Helper function for expand_ifn_atomic_compare_exchange - expand
7198 internal ATOMIC_COMPARE_EXCHANGE call into __atomic_compare_exchange_N
7199 call. The weak parameter must be dropped to match the expected parameter
7200 list and the expected argument changed from value to pointer to memory
7201 slot. */
7203 static void
7205 {
7221 /* Skip the boolean weak parameter. */
7224 /* At present we only have BUILT_IN_ATOMIC_COMPARE_EXCHANGE_{1,2,4,8,16}. */
7227 built_in_function fncode
7232 fndecl);
7237 {
7244 }
7245 }
7247 /* Expand IFN_ATOMIC_COMPARE_EXCHANGE internal function. */
7249 void
7251 {
7257 tree lhs;
7259 location_t loc
7266 {
7268 "failure memory model cannot be stronger than success "
7271 }
7274 {
7276 "invalid failure memory model for "
7280 }
7283 {
7286 }
7288 /* Expand the operands. */
7301 {
7304 }
7308 {
7314 }
7315 }
7317 /* Expand the __atomic_load intrinsic:
7318 TYPE __atomic_load (TYPE *object, enum memmodel)
7319 EXP is the CALL_EXPR.
7320 TARGET is an optional place for us to store the results. */
7322 static rtx
7324 {
7325 rtx mem;
7330 {
7331 location_t loc
7336 }
7341 /* Expand the operand. */
7345 }
7348 /* Expand the __atomic_store intrinsic:
7349 void __atomic_store (TYPE *object, TYPE desired, enum memmodel)
7350 EXP is the CALL_EXPR.
7351 TARGET is an optional place for us to store the results. */
7353 static rtx
7355 {
7362 {
7363 location_t loc
7368 }
7373 /* Expand the operands. */
7378 }
7380 /* Expand the __atomic_fetch_XXX intrinsic:
7381 TYPE __atomic_fetch_XXX (TYPE *object, TYPE val, enum memmodel)
7382 EXP is the CALL_EXPR.
7383 TARGET is an optional place for us to store the results.
7384 CODE is the operation, PLUS, MINUS, ADD, XOR, or IOR.
7385 FETCH_AFTER is true if returning the result of the operation.
7386 FETCH_AFTER is false if returning the value before the operation.
7387 IGNORE is true if the result is not used.
7388 EXT_CALL is the correct builtin for an external call if this cannot be
7389 resolved to an instruction sequence. */
7391 static rtx
7395 {
7398 tree fndecl;
7399 tree addr;
7403 /* Expand the operands. */
7407 /* Only try generating instructions if inlining is turned on. */
7409 {
7413 }
7415 /* Return if a different routine isn't needed for the library call. */
7419 /* Change the call to the specified function. */
7427 /* If we will emit code after the call, the call cannot be a tail call.
7428 If it is emitted as a tail call, a barrier is emitted after it, and
7429 then all trailing code is removed. */
7433 /* Expand the call here so we can emit trailing code. */
7436 /* Replace the original function just in case it matters. */
7439 /* Then issue the arithmetic correction to return the right result. */
7441 {
7443 {
7445 OPTAB_LIB_WIDEN);
7447 }
7448 else
7450 OPTAB_LIB_WIDEN);
7451 }
7453 }
7455 /* Expand IFN_ATOMIC_BIT_TEST_AND_* internal function. */
7457 void
7459 {
7467 optab optab;
7479 {
7494 }
7497 {
7504 }
7526 {
7531 }
7532 else
7534 OPTAB_DIRECT);
7537 }
7539 /* Expand an atomic clear operation.
7540 void _atomic_clear (BOOL *obj, enum memmodel)
7541 EXP is the call expression. */
7543 static rtx
7545 {
7546 machine_mode mode;
7555 {
7556 location_t loc
7561 }
7563 /* Try issuing an __atomic_store, and allow fallback to __sync_lock_release.
7564 Failing that, a store is issued by __atomic_store. The only way this can
7565 fail is if the bool type is larger than a word size. Unlikely, but
7566 handle it anyway for completeness. Assume a single threaded model since
7567 there is no atomic support in this case, and no barriers are required. */
7572 }
7574 /* Expand an atomic test_and_set operation.
7575 bool _atomic_test_and_set (BOOL *obj, enum memmodel)
7576 EXP is the call expression. */
7578 static rtx
7580 {
7581 rtx mem;
7583 machine_mode mode;
7590 }
7593 /* Return true if (optional) argument ARG1 of size ARG0 is always lock free on
7594 this architecture. If ARG1 is NULL, use typical alignment for size ARG0. */
7596 static tree
7598 {
7600 machine_mode mode;
7606 /* We need a corresponding integer mode for the access to be lock-free. */
7614 {
7617 /* Either this argument is null, or it's a fake pointer encoding
7618 the alignment of the object. */
7624 else
7626 }
7627 else
7628 {
7631 /* This function is usually invoked and folded immediately by the front
7632 end before anything else has a chance to look at it. The pointer
7633 parameter at this point is usually cast to a void *, so check for that
7634 and look past the cast. */
7644 /* Get the underlying type of the object. */
7647 }
7649 /* If the object has smaller alignment, the lock free routines cannot
7650 be used. */
7654 /* Check if a compare_and_swap pattern exists for the mode which represents
7655 the required size. The pattern is not allowed to fail, so the existence
7656 of the pattern indicates support is present. Also require that an
7657 atomic load exists for the required size. */
7660 else
7662 }
7664 /* Return true if the parameters to call EXP represent an object which will
7665 always generate lock free instructions. The first argument represents the
7666 size of the object, and the second parameter is a pointer to the object
7667 itself. If NULL is passed for the object, then the result is based on
7668 typical alignment for an object of the specified size. Otherwise return
7669 false. */
7671 static rtx
7673 {
7674 tree size;
7679 {
7682 }
7688 }
7690 /* Return a one or zero if it can be determined that object ARG1 of size ARG
7691 is lock free on this architecture. */
7693 static tree
7695 {
7699 /* If it isn't always lock free, don't generate a result. */
7704 }
7706 /* Return true if the parameters to call EXP represent an object which will
7707 always generate lock free instructions. The first argument represents the
7708 size of the object, and the second parameter is a pointer to the object
7709 itself. If NULL is passed for the object, then the result is based on
7710 typical alignment for an object of the specified size. Otherwise return
7711 NULL*/
7713 static rtx
7715 {
7716 tree size;
7721 {
7724 }
7729 /* If the value is known at compile time, return the RTX for it. */
7735 }
7737 /* Expand the __atomic_thread_fence intrinsic:
7738 void __atomic_thread_fence (enum memmodel)
7739 EXP is the CALL_EXPR. */
7741 static void
7743 {
7746 }
7748 /* Expand the __atomic_signal_fence intrinsic:
7749 void __atomic_signal_fence (enum memmodel)
7750 EXP is the CALL_EXPR. */
7752 static void
7754 {
7757 }
7759 /* Expand the __sync_synchronize intrinsic. */
7761 static void
7763 {
7765 }
7767 static rtx
7769 {
7775 {
7777 /* If the target is not sutitable then create a new target. */
7785 }
7788 }
7790 static void
7792 {
7798 {
7805 }
7807 }
7809 \f
7810 /* Emit code to restore the current value of stack. */
7812 static void
7814 {
7826 }
7828 /* Emit code to save the current value of stack. */
7830 static rtx
7832 {
7837 }
7839 /* Emit code to get the openacc gang, worker or vector id or size. */
7841 static rtx
7843 {
7845 rtx fallback_retval;
7848 {
7861 }
7864 {
7867 }
7871 {
7874 }
7878 {
7886 }
7895 {
7898 }
7906 }
7908 /* Expand a string compare operation using a sequence of char comparison
7909 to get rid of the calling overhead, with result going to TARGET if
7910 that's convenient.
7912 VAR_STR is the variable string source;
7913 CONST_STR is the constant string source;
7914 LENGTH is the number of chars to compare;
7915 CONST_STR_N indicates which source string is the constant string;
7916 IS_MEMCMP indicates whether it's a memcmp or strcmp.
7918 to: (assume const_str_n is 2, i.e., arg2 is a constant string)
7920 target = (int) (unsigned char) var_str[0]
7921 - (int) (unsigned char) const_str[0];
7922 if (target != 0)
7923 goto ne_label;
7924 ...
7925 target = (int) (unsigned char) var_str[length - 2]
7926 - (int) (unsigned char) const_str[length - 2];
7927 if (target != 0)
7928 goto ne_label;
7929 target = (int) (unsigned char) var_str[length - 1]
7930 - (int) (unsigned char) const_str[length - 1];
7931 ne_label:
7932 */
7934 static rtx
7938 {
7940 rtx var_rtx_array
7947 scalar_int_mode unit_mode
7953 {
7954 var_rtx
7968 }
7976 }
7978 /* Inline expansion of a call to str(n)cmp and memcmp, with result going
7979 to TARGET if that's convenient.
7980 If the call is not been inlined, return NULL_RTX. */
7982 static rtx
7984 {
7989 /* Do NOT apply this inlining expansion when optimizing for size or
7990 optimization level below 2. */
7998 /* On a target where the type of the call (int) has same or narrower presicion
7999 than unsigned char, give up the inlining expansion. */
8012 /* Get the object representation of the initializers of ARG1 and ARG2
8013 as strings, provided they refer to constant objects, with their byte
8014 sizes in LEN1 and LEN2, respectively. */
8018 /* Fail if neither argument refers to an initialized constant. */
8023 {
8024 /* Fail if the memcmp/strncmp bound is not a constant. */
8031 {
8032 /* Fail if the memcmp bound is greater than the size of either
8033 of the two constant objects. */
8037 }
8038 }
8041 {
8042 /* For string functions (i.e., strcmp and strncmp) reduce LEN1
8043 and LEN2 to the length of the nul-terminated string stored
8044 in each. */
8049 }
8051 /* See inline_string_cmp. */
8059 else
8062 /* For strncmp only, compute the new bound as the smallest of
8063 the lengths of the two strings (plus 1) and the bound provided
8064 to the function. */
8069 /* If the bound of the comparison is larger than the threshold,
8070 do nothing. */
8076 /* Now, start inline expansion the call. */
8080 }
8082 /* Expand a call to __builtin_speculation_safe_value_<N>. MODE
8083 represents the size of the first argument to that call, or VOIDmode
8084 if the argument is a pointer. IGNORE will be true if the result
8085 isn't used. */
8086 static rtx
8089 {
8096 {
8099 }
8103 /* An optional second argument can be used as a failsafe value on
8104 some machines. If it isn't present, then the failsafe value is
8105 assumed to be 0. */
8107 {
8110 }
8111 else
8114 /* If the result isn't used, the behavior is undefined. It would be
8115 nice to emit a warning here, but path splitting means this might
8116 happen with legitimate code. So simply drop the builtin
8117 expansion in that case; we've handled any side-effects above. */
8121 /* If we don't have a suitable target, create one to hold the result. */
8129 }
8131 /* Expand an expression EXP that calls a built-in function,
8132 with result going to TARGET if that's convenient
8133 (and in mode MODE if that's convenient).
8134 SUBTARGET may be used as the target for computing one of EXP's operands.
8135 IGNORE is nonzero if the value is to be ignored. */
8137 rtx
8140 {
8148 /* When ASan is enabled, we don't want to expand some memory/string
8149 builtins and rely on libsanitizer's hooks. This allows us to avoid
8150 redundant checks and be sure, that possible overflow will be detected
8151 by ASan. */
8157 /* When not optimizing, generate calls to library functions for a certain
8158 set of builtins. */
8172 /* The built-in function expanders test for target == const0_rtx
8173 to determine whether the function's result will be ignored. */
8177 /* If the result of a pure or const built-in function is ignored, and
8178 none of its arguments are volatile, we can avoid expanding the
8179 built-in call and just evaluate the arguments for side-effects. */
8183 {
8185 tree arg;
8186 call_expr_arg_iterator iter;
8190 {
8193 }
8196 {
8200 }
8201 }
8204 {
8222 /* Just do a normal library call if we were unable to fold
8223 the values. */
8300 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
8301 FUNCTION with a copy of the parameters described by
8302 ARGUMENTS, and ARGSIZE. It returns a block of memory
8303 allocated on the stack into which is stored all the registers
8304 that might possibly be used for returning the result of a
8305 function. ARGUMENTS is the value returned by
8306 __builtin_apply_args. ARGSIZE is the number of bytes of
8307 arguments that must be copied. ??? How should this value be
8308 computed? We'll also need a safe worst case value for varargs
8309 functions. */
8316 else
8317 {
8325 }
8327 /* __builtin_return (RESULT) causes the function to return the
8328 value described by RESULT. RESULT is address of the block of
8329 memory returned by __builtin_apply. */
8339 /* All valid uses of __builtin_va_arg_pack () are removed during
8340 inlining. */
8345 /* All valid uses of __builtin_va_arg_pack_len () are removed during
8346 inlining. */
8350 /* Return the address of the first anonymous stack arg. */
8372 /* Returns the address of the area where the structure is returned.
8373 0 otherwise. */
8379 else
8382 CASE_BUILT_IN_ALLOCA:
8500 {
8503 }
8572 /* Expand it as BUILT_IN_MEMCMP_EQ first. If not successful, change it
8573 back to a BUILT_IN_STRCMP. Remember to delete the 3rd paramater
8574 when changing it to a strcmp call. */
8580 /* Change this call back to a BUILT_IN_STRCMP. */
8584 /* Delete the last parameter. */
8591 /* FALLTHROUGH */
8599 /* Expand it as BUILT_IN_MEMCMP_EQ first. If not successful, change it
8600 back to a BUILT_IN_STRNCMP. */
8606 /* Change it back to a BUILT_IN_STRNCMP. */
8609 /* FALLTHROUGH */
8624 {
8627 }
8631 /* This should have been lowered to the builtins below. */
8635 /* __builtin_setjmp_setup is passed a pointer to an array of five words
8636 and the receiver label. */
8638 {
8644 /* This is copied from the handling of non-local gotos. */
8646 nonlocal_goto_handler_labels
8648 nonlocal_goto_handler_labels);
8649 /* ??? Do not let expand_label treat us as such since we would
8650 not want to be both on the list of non-local labels and on
8651 the list of forced labels. */
8654 }
8658 /* __builtin_setjmp_receiver is passed the receiver label. */
8660 {
8666 }
8669 /* __builtin_longjmp is passed a pointer to an array of five words.
8670 It's similar to the C library longjmp function but works with
8671 __builtin_setjmp above. */
8674 {
8680 {
8683 }
8687 }
8696 /* This updates the setjmp buffer that is its argument with the value
8697 of the current stack pointer. */
8700 {
8701 rtx buf_addr
8706 }
8726 /* Various hooks for the DWARF 2 __throw routine. */
8732 #ifdef DWARF2_UNWIND_INFO
8738 #endif
8940 mode = get_builtin_sync_mode
8952 mode = get_builtin_sync_mode
8999 {
9003 mode =
9009 /* If this is turned into an external library call, the weak parameter
9010 must be dropped to match the expected parameter list. */
9015 /* Skip the boolean weak parameter. */
9020 }
9049 {
9059 }
9065 {
9075 }
9081 {
9091 }
9097 {
9107 }
9113 {
9123 }
9129 {
9139 }
9276 /* Do library call, if we failed to expand the builtin when
9277 folding. */
9297 }
9299 /* The switch statement above can drop through to cause the function
9300 to be called normally. */
9302 }
9304 /* Determine whether a tree node represents a call to a built-in
9305 function. If the tree T is a call to a built-in function with
9306 the right number of arguments of the appropriate types, return
9307 the DECL_FUNCTION_CODE of the call, e.g. BUILT_IN_SQRT.
9308 Otherwise the return value is END_BUILTINS. */
9310 enum built_in_function
9312 {
9315 const_call_expr_arg_iterator iter;
9327 {
9328 /* If a function doesn't take a variable number of arguments,
9329 the last element in the list will have type `void'. */
9332 {
9336 }
9345 {
9348 }
9350 {
9353 }
9355 {
9358 }
9360 {
9363 }
9364 else
9366 }
9368 /* Variable-length argument list. */
9370 }
9372 /* Fold a call to __builtin_constant_p, if we know its argument ARG will
9373 evaluate to a constant. */
9375 static tree
9377 {
9378 /* We return 1 for a numeric type that's known to be a constant
9379 value at compile-time or for an aggregate type that's a
9380 literal constant. */
9383 /* If we know this is a constant, emit the constant of one. */
9389 {
9396 }
9398 /* If this expression has side effects, show we don't know it to be a
9399 constant. Likewise if it's a pointer or aggregate type since in
9400 those case we only want literals, since those are only optimized
9401 when generating RTL, not later.
9402 And finally, if we are compiling an initializer, not code, we
9403 need to return a definite result now; there's not going to be any
9404 more optimization done. */
9409 || folding_initializer
9414 }
9416 /* Create builtin_expect or builtin_expect_with_probability
9417 with PRED and EXPECTED as its arguments and return it as a truthvalue.
9418 Fortran FE can also produce builtin_expect with PREDICTOR as third argument.
9419 builtin_expect_with_probability instead uses third argument as PROBABILITY
9420 value. */
9422 static tree
9425 {
9440 else
9442 predictor);
9446 }
9448 /* Fold a call to builtin_expect with arguments ARG0, ARG1, ARG2, ARG3. Return
9449 NULL_TREE if no simplification is possible. */
9451 tree
9453 tree arg3)
9454 {
9458 /* Distribute the expected value over short-circuiting operators.
9459 See through the cast from truthvalue_type_node to long. */
9466 /* If this is a builtin_expect within a builtin_expect keep the
9467 inner one. See through a comparison against a constant. It
9468 might have been added to create a thruthvalue. */
9484 {
9494 }
9496 /* If the argument isn't invariant then there's nothing else we can do. */
9500 /* If we expect that a comparison against the argument will fold to
9501 a constant return the constant. In practice, this means a true
9502 constant or the address of a non-weak symbol. */
9506 {
9507 do
9508 {
9510 }
9515 }
9517 /* Otherwise, ARG0 already has the proper type for the return value. */
9519 }
9521 /* Fold a call to __builtin_classify_type with argument ARG. */
9523 static tree
9525 {
9530 }
9532 /* Fold a call EXPR (which may be null) to __builtin_strlen with argument
9533 ARG. */
9535 static tree
9537 {
9540 else
9541 {
9542 c_strlen_data lendata = { };
9552 {
9558 }
9561 }
9562 }
9564 /* Fold a call to __builtin_inf or __builtin_huge_val. */
9566 static tree
9568 {
9569 REAL_VALUE_TYPE real;
9571 /* __builtin_inff is intended to be usable to define INFINITY on all
9572 targets. If an infinity is not available, INFINITY expands "to a
9573 positive constant of type float that overflows at translation
9574 time", footnote "In this case, using INFINITY will violate the
9575 constraint in 6.4.4 and thus require a diagnostic." (C99 7.12#4).
9576 Thus we pedwarn to ensure this constraint violation is
9577 diagnosed. */
9583 }
9585 /* Fold function call to builtin sincos, sincosf, or sincosl. Return
9586 NULL_TREE if no simplification can be made. */
9588 static tree
9591 {
9592 tree type;
9602 /* Calculate the result when the argument is a constant. */
9607 /* Canonicalize sincos to cexpi. */
9609 {
9612 }
9614 {
9621 }
9633 }
9635 /* Fold function call to builtin memcmp with arguments ARG1 and ARG2.
9636 Return NULL_TREE if no simplification can be made. */
9638 static tree
9640 {
9646 /* If the LEN parameter is zero, return zero. */
9651 /* If ARG1 and ARG2 are the same (and not volatile), return zero. */
9655 /* If len parameter is one, return an expression corresponding to
9656 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
9658 {
9660 tree cst_uchar_ptr_node
9663 tree ind1
9667 cst_uchar_ptr_node,
9668 arg1)));
9669 tree ind2
9673 cst_uchar_ptr_node,
9674 arg2)));
9676 }
9679 }
9681 /* Fold a call to builtin isascii with argument ARG. */
9683 static tree
9685 {
9688 else
9689 {
9690 /* Transform isascii(c) -> ((c & ~0x7f) == 0). */
9696 }
9697 }
9699 /* Fold a call to builtin toascii with argument ARG. */
9701 static tree
9703 {
9707 /* Transform toascii(c) -> (c & 0x7f). */
9710 }
9712 /* Fold a call to builtin isdigit with argument ARG. */
9714 static tree
9716 {
9719 else
9720 {
9721 /* Transform isdigit(c) -> (unsigned)(c) - '0' <= 9. */
9722 /* According to the C standard, isdigit is unaffected by locale.
9723 However, it definitely is affected by the target character set. */
9724 unsigned HOST_WIDE_INT target_digit0
9735 }
9736 }
9738 /* Fold a call to fabs, fabsf or fabsl with argument ARG. */
9740 static tree
9742 {
9748 }
9750 /* Fold a call to abs, labs, llabs or imaxabs with argument ARG. */
9752 static tree
9754 {
9760 }
9762 /* Fold a call to builtin carg(a+bi) -> atan2(b,a). */
9764 static tree
9766 {
9769 {
9773 {
9778 }
9779 }
9782 }
9784 /* Fold a call to builtin frexp, we can assume the base is 2. */
9786 static tree
9788 {
9799 /* Proceed if a valid pointer type was passed in. */
9801 {
9806 {
9808 /* For +-0, return (*exp = 0, +-0). */
9814 /* For +-NaN or +-Inf, *exp is unspecified, return arg0. */
9817 {
9818 /* Since the frexp function always expects base 2, and in
9819 GCC normalized significands are already in the range
9820 [0.5, 1.0), we have exactly what frexp wants. */
9825 }
9829 }
9831 /* Create the COMPOUND_EXPR (*arg1 = trunc, frac). */
9835 }
9838 }
9840 /* Fold a call to builtin modf. */
9842 static tree
9844 {
9855 /* Proceed if a valid pointer type was passed in. */
9857 {
9862 {
9865 /* For +-NaN or +-0, return (*arg1 = arg0, arg0). */
9869 /* For +-Inf, return (*arg1 = arg0, +-0). */
9875 /* Return (*arg1 = trunc(arg0), arg0-trunc(arg0)). */
9878 /* If the original number was negative and already
9879 integral, then the fractional part is -0.0. */
9883 }
9885 /* Create the COMPOUND_EXPR (*arg1 = trunc, frac). */
9891 }
9894 }
9896 /* Given a location LOC, an interclass builtin function decl FNDECL
9897 and its single argument ARG, return an folded expression computing
9898 the same, or NULL_TREE if we either couldn't or didn't want to fold
9899 (the latter happen if there's an RTL instruction available). */
9901 static tree
9903 {
9904 machine_mode mode;
9916 /* If there is no optab, try generic code. */
9918 {
9919 tree result;
9922 {
9923 /* isinf(x) -> isgreater(fabs(x),DBL_MAX). */
9926 REAL_VALUE_TYPE r;
9930 {
9931 /* NaN and Inf are encoded in the high-order double value
9932 only. The low-order value is not significant. */
9936 }
9943 }
9946 {
9947 /* isfinite(x) -> islessequal(fabs(x),DBL_MAX). */
9950 REAL_VALUE_TYPE r;
9954 {
9955 /* NaN and Inf are encoded in the high-order double value
9956 only. The low-order value is not significant. */
9960 }
9966 /*result = fold_build2_loc (loc, UNGT_EXPR,
9967 TREE_TYPE (TREE_TYPE (fndecl)),
9968 fold_build1_loc (loc, ABS_EXPR, type, arg),
9969 build_real (type, r));
9970 result = fold_build1_loc (loc, TRUTH_NOT_EXPR,
9971 TREE_TYPE (TREE_TYPE (fndecl)),
9972 result);*/
9974 }
9976 {
9977 /* isnormal(x) -> isgreaterequal(fabs(x),DBL_MIN) &
9978 islessequal(fabs(x),DBL_MAX). */
9988 {
9989 /* Use double to test the normal range of IBM extended
9990 precision. Emin for IBM extended precision is
9991 different to emin for IEEE double, being 53 higher
9992 since the low double exponent is at least 53 lower
9993 than the high double exponent. */
9997 }
10009 {
10010 /* Testing the high end of the range is done just using
10011 the high double, using the same test as isfinite().
10012 For the subnormal end of the range we first test the
10013 high double, then if its magnitude is equal to the
10014 limit of 0x1p-969, we test whether the low double is
10015 non-zero and opposite sign to the high double. */
10031 integer_type_node,
10037 }
10038 else
10039 {
10040 tree const isge_fn
10043 }
10047 }
10050 }
10053 }
10055 /* Fold a call to __builtin_isnan(), __builtin_isinf, __builtin_finite.
10056 ARG is the argument for the call. */
10058 static tree
10060 {
10067 {
10075 {
10076 /* isinf_sign(x) -> isinf(x) ? (signbit(x) ? -1 : 1) : 0 */
10077 /* In a boolean context, GCC will fold the inner COND_EXPR to
10078 1. So e.g. "if (isinf_sign(x))" would be folded to just
10079 "if (isinf(x) ? 1 : 0)" which becomes "if (isinf(x))". */
10087 {
10100 integer_zero_node);
10101 }
10104 }
10117 {
10120 {
10121 /* NaN and Inf are encoded in the high-order double value
10122 only. The low-order value is not significant. */
10124 }
10125 }
10131 }
10132 }
10134 /* Fold a call to __builtin_fpclassify(int, int, int, int, int, ...).
10135 This builtin will generate code to return the appropriate floating
10136 point classification depending on the value of the floating point
10137 number passed in. The possible return values must be supplied as
10138 int arguments to the call in the following order: FP_NAN, FP_INFINITE,
10139 FP_NORMAL, FP_SUBNORMAL and FP_ZERO. The ellipses is for exactly
10140 one floating point argument which is "type generic". */
10142 static tree
10144 {
10147 machine_mode mode;
10148 REAL_VALUE_TYPE r;
10151 /* Verify the required arguments in the original call. */
10171 /* fpclassify(x) ->
10172 isnan(x) ? FP_NAN :
10173 (fabs(x) == Inf ? FP_INFINITE :
10174 (fabs(x) >= DBL_MIN ? FP_NORMAL :
10175 (x == 0 ? FP_ZERO : FP_SUBNORMAL))). */
10189 {
10195 }
10198 {
10201 }
10204 }
10206 /* Fold a call to an unordered comparison function such as
10207 __builtin_isgreater(). FNDECL is the FUNCTION_DECL for the function
10208 being called and ARG0 and ARG1 are the arguments for the call.
10209 UNORDERED_CODE and ORDERED_CODE are comparison codes that give
10210 the opposite of the desired result. UNORDERED_CODE is used
10211 for modes that can hold NaNs and ORDERED_CODE is used for
10212 the rest. */
10214 static tree
10218 {
10232 /* Choose the wider of two real types. */
10244 {
10248 }
10253 }
10255 /* Fold __builtin_{,s,u}{add,sub,mul}{,l,ll}_overflow, either into normal
10256 arithmetics if it can never overflow, or into internal functions that
10257 return both result of arithmetics and overflowed boolean flag in
10258 a complex integer result, or some other check for overflow.
10259 Similarly fold __builtin_{add,sub,mul}_overflow_p to just the overflow
10260 checking part of that. */
10262 static tree
10265 {
10267 /* The code of the expression corresponding to the built-in. */
10272 {
10275 /* FALLTHRU */
10288 /* FALLTHRU */
10301 /* FALLTHRU */
10314 }
10316 /* For the "generic" overloads, the first two arguments can have different
10317 types and the last argument determines the target type to use to check
10318 for overflow. The arguments of the other overloads all have the same
10319 type. */
10322 /* For the __builtin_{add,sub,mul}_overflow_p builtins, when the first two
10323 arguments are constant, attempt to fold the built-in call into a constant
10324 expression indicating whether or not it detected an overflow. */
10328 /* Perform the computation in the target type and check for overflow. */
10332 arg2);
10336 {
10344 }
10345 else
10346 {
10354 }
10360 tree store
10363 }
10365 /* Fold a call to __builtin_FILE to a constant string. */
10369 {
10371 {
10372 /* The documentation says this builtin is equivalent to the preprocessor
10373 __FILE__ macro so it appears appropriate to use the same file prefix
10374 mappings. */
10377 }
10380 }
10382 /* Fold a call to __builtin_FUNCTION to a constant string. */
10386 {
10393 }
10395 /* Fold a call to __builtin_LINE to an integer constant. */
10399 {
10401 }
10403 /* Fold a call to built-in function FNDECL with 0 arguments.
10404 This function returns NULL_TREE if no simplification was possible. */
10406 static tree
10408 {
10412 {
10438 }
10440 }
10442 /* Fold a call to built-in function FNDECL with 1 argument, ARG0.
10443 This function returns NULL_TREE if no simplification was possible. */
10445 static tree
10447 {
10458 {
10460 {
10463 /* Gimplification will pull the CALL_EXPR for the builtin out of
10464 an if condition. When not optimizing, we'll not CSE it back.
10465 To avoid link error types of regressions, return false now. */
10470 }
10526 {
10531 }
10537 {
10542 }
10563 }
10567 }
10569 /* Folds a call EXPR (which may be null) to built-in function FNDECL
10570 with 2 arguments, ARG0 and ARG1. This function returns NULL_TREE
10571 if no simplification was possible. */
10573 static tree
10575 {
10587 {
10631 NOP_EXPR);
10633 /* We do the folding for va_start in the expander. */
10648 }
10650 }
10652 /* Fold a call to built-in function FNDECL with 3 arguments, ARG0, ARG1,
10653 and ARG2.
10654 This function returns NULL_TREE if no simplification was possible. */
10656 static tree
10659 {
10673 {
10722 }
10724 }
10726 /* Folds a call EXPR (which may be null) to built-in function FNDECL.
10727 ARGS is an array of NARGS arguments. IGNORE is true if the result
10728 of the function call is ignored. This function returns NULL_TREE
10729 if no simplification was possible. */
10731 static tree
10734 {
10738 {
10754 }
10756 {
10760 }
10762 }
10764 /* Construct a new CALL_EXPR to FNDECL using the tail of the argument
10765 list ARGS along with N new arguments in NEWARGS. SKIP is the number
10766 of arguments in ARGS to be omitted. OLDNARGS is the number of
10767 elements in ARGS. */
10769 static tree
10772 {
10777 {
10785 }
10786 else
10790 }
10792 /* Return true if FNDECL shouldn't be folded right now.
10793 If a built-in function has an inline attribute always_inline
10794 wrapper, defer folding it after always_inline functions have
10795 been inlined, otherwise e.g. -D_FORTIFY_SOURCE checking
10796 might not be performed. */
10798 bool
10800 {
10803 && cfun
10806 }
10808 /* A wrapper function for builtin folding that prevents warnings for
10809 "statement without effect" and the like, caused by removing the
10810 call node earlier than the warning is generated. */
10812 tree
10814 {
10818 /* If CALL_EXPR_VA_ARG_PACK is set, the arguments aren't finalized
10819 yet. Defer folding until we see all the arguments
10820 (after inlining). */
10822 {
10825 /* Before gimplification CALL_EXPR_VA_ARG_PACK is not set, but
10826 instead last argument is __builtin_va_arg_pack (). Defer folding
10827 even in that case, until arguments are finalized. */
10829 {
10833 }
10841 else
10842 {
10847 }
10848 }
10850 }
10852 /* Fold a CALL_EXPR with type TYPE with FN as the function expression.
10853 N arguments are passed in the array ARGARRAY. Return a folded
10854 expression or NULL_TREE if no simplification was possible. */
10856 tree
10858 tree fn,
10861 {
10868 {
10869 /* If last argument is __builtin_va_arg_pack (), arguments to this
10870 function are not finalized yet. Defer folding until they are. */
10872 {
10876 }
10881 else
10883 }
10886 }
10888 /* Construct a new CALL_EXPR using the tail of the argument list of EXP
10889 along with N new arguments specified as the "..." parameters. SKIP
10890 is the number of arguments in EXP to be omitted. This function is used
10891 to do varargs-to-varargs transformations. */
10893 static tree
10895 {
10897 tree t;
10905 }
10907 /* Validate a single argument ARG against a tree code CODE representing
10908 a type. Return true when argument is valid. */
10910 static bool
10912 {
10920 }
10922 /* This function validates the types of a function call argument list
10923 against a specified list of tree_codes. If the last specifier is a 0,
10924 that represents an ellipses, otherwise the last specifier must be a
10925 VOID_TYPE.
10927 This is the GIMPLE version of validate_arglist. Eventually we want to
10928 completely convert builtins.c to work from GIMPLEs and the tree based
10929 validate_arglist will then be removed. */
10931 bool
10933 {
10937 const_tree arg;
10943 do
10944 {
10947 {
10949 /* This signifies an ellipses, any further arguments are all ok. */
10953 /* This signifies an endlink, if no arguments remain, return
10954 true, otherwise return false. */
10958 /* If no parameters remain or the parameter's code does not
10959 match the specified code, return false. Otherwise continue
10960 checking any remaining arguments. */
10965 }
10966 }
10969 /* We need gotos here since we can only have one VA_CLOSE in a
10970 function. */
10971 end: ;
10975 }
10977 /* Default target-specific builtin expander that does nothing. */
10979 rtx
10981 rtx target ATTRIBUTE_UNUSED,
10982 rtx subtarget ATTRIBUTE_UNUSED,
10983 machine_mode mode ATTRIBUTE_UNUSED,
10985 {
10987 }
10989 /* Returns true is EXP represents data that would potentially reside
10990 in a readonly section. */
10992 bool
10994 {
11004 /* Make sure we call decl_readonly_section only for trees it
11005 can handle (since it returns true for everything it doesn't
11006 understand). */
11011 else
11013 }
11015 /* Simplify a call to the strpbrk builtin. S1 and S2 are the arguments
11016 to the call, and TYPE is its return type.
11018 Return NULL_TREE if no simplification was possible, otherwise return the
11019 simplified form of the call as a tree.
11021 The simplified form may be a constant or other expression which
11022 computes the same value, but in a more efficient manner (including
11023 calls to other builtin functions).
11025 The call may contain arguments which need to be evaluated, but
11026 which are not useful to determine the result of the call. In
11027 this case we return a chain of COMPOUND_EXPRs. The LHS of each
11028 COMPOUND_EXPR will be an argument which must be evaluated.
11029 COMPOUND_EXPRs are chained through their RHS. The RHS of the last
11030 COMPOUND_EXPR in the chain will contain the tree for the simplified
11031 form of the builtin function call. */
11033 static tree
11035 {
11040 tree fn;
11049 {
11051 tree tem;
11056 /* Return an offset into the constant string argument. */
11059 }
11062 /* strpbrk(x, "") == NULL.
11063 Evaluate and ignore s1 in case it had side-effects. */
11073 /* New argument list transforming strpbrk(s1, s2) to
11074 strchr(s1, s2[0]). */
11077 }
11079 /* Simplify a call to the strspn builtin. S1 and S2 are the arguments
11080 to the call.
11082 Return NULL_TREE if no simplification was possible, otherwise return the
11083 simplified form of the call as a tree.
11085 The simplified form may be a constant or other expression which
11086 computes the same value, but in a more efficient manner (including
11087 calls to other builtin functions).
11089 The call may contain arguments which need to be evaluated, but
11090 which are not useful to determine the result of the call. In
11091 this case we return a chain of COMPOUND_EXPRs. The LHS of each
11092 COMPOUND_EXPR will be an argument which must be evaluated.
11093 COMPOUND_EXPRs are chained through their RHS. The RHS of the last
11094 COMPOUND_EXPR in the chain will contain the tree for the simplified
11095 form of the builtin function call. */
11097 static tree
11099 {
11110 /* If either argument is "", return NULL_TREE. */
11112 /* Evaluate and ignore both arguments in case either one has
11113 side-effects. */
11117 }
11119 /* Simplify a call to the strcspn builtin. S1 and S2 are the arguments
11120 to the call.
11122 Return NULL_TREE if no simplification was possible, otherwise return the
11123 simplified form of the call as a tree.
11125 The simplified form may be a constant or other expression which
11126 computes the same value, but in a more efficient manner (including
11127 calls to other builtin functions).
11129 The call may contain arguments which need to be evaluated, but
11130 which are not useful to determine the result of the call. In
11131 this case we return a chain of COMPOUND_EXPRs. The LHS of each
11132 COMPOUND_EXPR will be an argument which must be evaluated.
11133 COMPOUND_EXPRs are chained through their RHS. The RHS of the last
11134 COMPOUND_EXPR in the chain will contain the tree for the simplified
11135 form of the builtin function call. */
11137 static tree
11139 {
11148 /* If the first argument is "", return NULL_TREE. */
11151 {
11152 /* Evaluate and ignore argument s2 in case it has
11153 side-effects. */
11156 }
11158 /* If the second argument is "", return __builtin_strlen(s1). */
11161 {
11164 /* If the replacement _DECL isn't initialized, don't do the
11165 transformation. */
11170 }
11172 }
11174 /* Fold the next_arg or va_start call EXP. Returns true if there was an error
11175 produced. False otherwise. This is done so that we don't output the error
11176 or warning twice or three times. */
11178 bool
11180 {
11183 tree arg;
11184 /* There is good chance the current input_location points inside the
11185 definition of the va_start macro (perhaps on the token for
11186 builtin) in a system header, so warnings will not be emitted.
11187 Use the location in real source code. */
11188 location_t current_location =
11190 NULL);
11193 {
11196 }
11199 {
11201 {
11204 }
11206 }
11207 /* We use __builtin_va_start (ap, 0, 0) or __builtin_next_arg (0, 0)
11208 when we checked the arguments and if needed issued a warning. */
11209 else
11210 {
11212 {
11213 /* Evidently an out of date version of <stdarg.h>; can't validate
11214 va_start's second argument, but can still work as intended. */
11216 OPT_Wvarargs,
11219 }
11221 {
11224 }
11226 }
11231 /* We destructively modify the call to be __builtin_va_start (ap, 0)
11232 or __builtin_next_arg (0) the first time we see it, after checking
11233 the arguments and if needed issuing a warning. */
11235 {
11238 /* Strip off all nops for the sake of the comparison. This
11239 is not quite the same as STRIP_NOPS. It does more.
11240 We must also strip off INDIRECT_EXPR for C++ reference
11241 parameters. */
11246 {
11247 /* FIXME: Sometimes with the tree optimizers we can get the
11248 not the last argument even though the user used the last
11249 argument. We just warn and set the arg to be the last
11250 argument so that we will get wrong-code because of
11251 it. */
11253 OPT_Wvarargs,
11255 }
11257 /* Undefined by C99 7.15.1.4p4 (va_start):
11258 "If the parameter parmN is declared with the register storage
11259 class, with a function or array type, or with a type that is
11260 not compatible with the type that results after application of
11261 the default argument promotions, the behavior is undefined."
11262 */
11264 {
11266 OPT_Wvarargs,
11267 "undefined behavior when second parameter of "
11269 }
11271 /* We want to verify the second parameter just once before the tree
11272 optimizers are run and then avoid keeping it in the tree,
11273 as otherwise we could warn even for correct code like:
11274 void foo (int i, ...)
11275 { va_list ap; i++; va_start (ap, i); va_end (ap); } */
11278 else
11280 }
11282 }
11285 /* Expand a call EXP to __builtin_object_size. */
11287 static rtx
11289 {
11290 tree ost;
11295 {
11300 }
11308 {
11313 }
11318 }
11320 /* Expand EXP, a call to the __mem{cpy,pcpy,move,set}_chk builtin.
11321 FCODE is the BUILT_IN_* to use.
11322 Return NULL_RTX if we failed; the caller should emit a normal call,
11323 otherwise try to get the result in TARGET, if convenient (and in
11324 mode MODE if that's convenient). */
11326 static rtx
11329 {
11331 POINTER_TYPE,
11332 fcode == BUILT_IN_MEMSET_CHK
11342 /* FIXME: Set access mode to write only for memset et al. */
11350 {
11351 /* Avoid transforming the checking call to an ordinary one when
11352 an overflow has been detected or when the call couldn't be
11353 validated because the size is not constant. */
11358 /* If __builtin_mem{cpy,pcpy,move,set}_chk is used, assume
11359 mem{cpy,pcpy,move,set} is available. */
11361 {
11376 }
11385 }
11388 else
11389 {
11392 /* If DEST is not a pointer type, call the normal function. */
11396 /* If SRC and DEST are the same (and not volatile), do nothing. */
11398 {
11399 tree expr;
11402 {
11403 /* Evaluate and ignore LEN in case it has side-effects. */
11406 }
11410 }
11412 /* __memmove_chk special case. */
11414 {
11420 /* If src is categorized for a readonly section we can use
11421 normal __memcpy_chk. */
11423 {
11432 }
11433 }
11435 }
11436 }
11438 /* Emit warning if a buffer overflow is detected at compile time. */
11440 static void
11442 {
11443 /* The source string. */
11445 /* The size of the destination object returned by __builtin_object_size. */
11447 /* The string that is being concatenated with (as in __strcat_chk)
11448 or null if it isn't. */
11450 /* The maximum length of the source sequence in a bounded operation
11451 (such as __strncat_chk) or null if the operation isn't bounded
11452 (such as __strcat_chk). */
11454 /* The exact size of the access (such as in __strncpy_chk). */
11456 /* The access by the function that's checked. Except for snprintf
11457 both writing and reading is checked. */
11461 {
11469 /* For __strcat_chk the warning will be emitted only if overflowing
11470 by at least strlen (dest) + 1 bytes. */
11494 /* The only checked access the write to the destination. */
11499 }
11502 {
11503 /* Check __strncat_chk. There is no way to determine the length
11504 of the string to which the source string is being appended so
11505 just warn when the length of the source string is not known. */
11508 }
11511 }
11513 /* Emit warning if a buffer overflow is detected at compile time
11514 in __sprintf_chk/__vsprintf_chk calls. */
11516 static void
11518 {
11523 /* Verify the required arguments in the original call. */
11533 /* Check whether the format is a literal string constant. */
11541 /* If the format doesn't contain % args or %%, we know its size. */
11544 /* If the format is "%s" and first ... argument is a string literal,
11545 we know it too. */
11548 {
11549 tree arg;
11560 }
11561 else
11564 /* Add one for the terminating nul. */
11568 access_write_only);
11569 }
11571 /* Emit warning if a free is called with address of a variable. */
11573 static void
11575 {
11592 else
11595 }
11597 /* Fold a call to __builtin_object_size with arguments PTR and OST,
11598 if possible. */
11600 static tree
11602 {
11619 /* __builtin_object_size doesn't evaluate side-effects in its arguments;
11620 if there are any side-effects, it returns (size_t) -1 for types 0 and 1
11621 and (size_t) 0 for types 2 and 3. */
11626 {
11630 }
11632 {
11633 /* If object size is not known yet, delay folding until
11634 later. Maybe subsequent passes will help determining
11635 it. */
11639 }
11642 }
11644 /* Builtins with folding operations that operate on "..." arguments
11645 need special handling; we need to store the arguments in a convenient
11646 data structure before attempting any folding. Fortunately there are
11647 only a few builtins that fall into this category. FNDECL is the
11648 function, EXP is the CALL_EXPR for the call. */
11650 static tree
11652 {
11657 {
11664 }
11666 {
11671 }
11673 }
11675 /* Initialize format string characters in the target charset. */
11677 bool
11679 {
11682 {
11705 }
11707 }
11709 /* Helper function for do_mpfr_arg*(). Ensure M is a normal number
11710 and no overflow/underflow occurred. INEXACT is true if M was not
11711 exactly calculated. TYPE is the tree type for the result. This
11712 function assumes that you cleared the MPFR flags and then
11713 calculated M to see if anything subsequently set a flag prior to
11714 entering this function. Return NULL_TREE if any checks fail. */
11716 static tree
11718 {
11719 /* Proceed iff we get a normal number, i.e. not NaN or Inf and no
11720 overflow/underflow occurred. If -frounding-math, proceed iff the
11721 result of calling FUNC was exact. */
11724 {
11725 REAL_VALUE_TYPE rr;
11728 /* Proceed iff GCC's REAL_VALUE_TYPE can hold the MPFR value,
11729 check for overflow/underflow. If the REAL_VALUE_TYPE is zero
11730 but the mpft_t is not, then we underflowed in the
11731 conversion. */
11734 {
11735 REAL_VALUE_TYPE rmode;
11738 /* Proceed iff the specified mode can hold the value. */
11741 }
11742 }
11744 }
11746 /* Helper function for do_mpc_arg*(). Ensure M is a normal complex
11747 number and no overflow/underflow occurred. INEXACT is true if M
11748 was not exactly calculated. TYPE is the tree type for the result.
11749 This function assumes that you cleared the MPFR flags and then
11750 calculated M to see if anything subsequently set a flag prior to
11751 entering this function. Return NULL_TREE if any checks fail, if
11752 FORCE_CONVERT is true, then bypass the checks. */
11754 static tree
11756 {
11757 /* Proceed iff we get a normal number, i.e. not NaN or Inf and no
11758 overflow/underflow occurred. If -frounding-math, proceed iff the
11759 result of calling FUNC was exact. */
11764 {
11769 /* Proceed iff GCC's REAL_VALUE_TYPE can hold the MPFR values,
11770 check for overflow/underflow. If the REAL_VALUE_TYPE is zero
11771 but the mpft_t is not, then we underflowed in the
11772 conversion. */
11777 {
11782 /* Proceed iff the specified mode can hold the value. */
11788 }
11789 }
11791 }
11793 /* If arguments ARG0 and ARG1 are REAL_CSTs, call mpfr_remquo() to set
11794 the pointer *(ARG_QUO) and return the result. The type is taken
11795 from the type of ARG0 and is used for setting the precision of the
11796 calculation and results. */
11798 static tree
11800 {
11807 /* To proceed, MPFR must exactly represent the target floating point
11808 format, which only happens when the target base equals two. */
11812 {
11817 {
11821 tree result_rem;
11830 /* Remquo is independent of the rounding mode, so pass
11831 inexact=0 to do_mpfr_ckconv(). */
11835 {
11836 /* MPFR calculates quo in the host's long so it may
11837 return more bits in quo than the target int can hold
11838 if sizeof(host long) > sizeof(target int). This can
11839 happen even for native compilers in LP64 mode. In
11840 these cases, modulo the quo value with the largest
11841 number that the target int can hold while leaving one
11842 bit for the sign. */
11846 /* Dereference the quo pointer argument. */
11848 /* Proceed iff a valid pointer type was passed in. */
11850 {
11851 /* Set the value. */
11852 tree result_quo
11855 integer_quo));
11857 /* Combine the quo assignment with the rem. */
11860 }
11861 }
11862 }
11863 }
11865 }
11867 /* If ARG is a REAL_CST, call mpfr_lgamma() on it and return the
11868 resulting value as a tree with type TYPE. The mpfr precision is
11869 set to the precision of TYPE. We assume that this mpfr function
11870 returns zero if the result could be calculated exactly within the
11871 requested precision. In addition, the integer pointer represented
11872 by ARG_SG will be dereferenced and set to the appropriate signgam
11873 (-1,1) value. */
11875 static tree
11877 {
11882 /* To proceed, MPFR must exactly represent the target floating point
11883 format, which only happens when the target base equals two. Also
11884 verify ARG is a constant and that ARG_SG is an int pointer. */
11889 {
11892 /* In addition to NaN and Inf, the argument cannot be zero or a
11893 negative integer. */
11897 {
11902 mpfr_t m;
11903 tree result_lg;
11912 {
11913 tree result_sg;
11915 /* Dereference the arg_sg pointer argument. */
11917 /* Assign the signgam value into *arg_sg. */
11922 /* Combine the signgam assignment with the lgamma result. */
11925 }
11926 }
11927 }
11930 }
11932 /* If arguments ARG0 and ARG1 are a COMPLEX_CST, call the two-argument
11933 mpc function FUNC on it and return the resulting value as a tree
11934 with type TYPE. The mpfr precision is set to the precision of
11935 TYPE. We assume that function FUNC returns zero if the result
11936 could be calculated exactly within the requested precision. If
11937 DO_NONFINITE is true, then fold expressions containing Inf or NaN
11938 in the arguments and/or results. */
11940 tree
11943 {
11949 /* To proceed, MPFR must exactly represent the target floating point
11950 format, which only happens when the target base equals two. */
11956 {
11965 {
11986 }
11987 }
11990 }
11992 /* A wrapper function for builtin folding that prevents warnings for
11993 "statement without effect" and the like, caused by removing the
11994 call node earlier than the warning is generated. */
11996 tree
11998 {
12004 {
12013 {
12015 }
12016 else
12017 {
12020 {
12021 /* Propagate location information from original call to
12022 expansion of builtin. Otherwise things like
12023 maybe_emit_chk_warning, that operate on the expansion
12024 of a builtin, will use the wrong location information. */
12026 {
12034 }
12036 }
12037 }
12038 }
12040 }
12042 /* Look up the function in builtin_decl that corresponds to DECL
12043 and set ASMSPEC as its user assembler name. DECL must be a
12044 function decl that declares a builtin. */
12046 void
12048 {
12057 {
12061 }
12062 }
12064 /* Return true if DECL is a builtin that expands to a constant or similarly
12065 simple code. */
12066 bool
12068 {
12071 {
12072 /* Builtins that expand to constants. */
12077 /* Simple register moves or loads from stack. */
12088 /* Exception state returns or moves registers around. */
12096 }
12099 }
12101 /* Return true if DECL is a builtin that is not expensive, i.e., they are
12102 most probably expanded inline into reasonably simple code. This is a
12103 superset of is_simple_builtin. */
12104 bool
12106 {
12113 {
12115 CASE_BUILT_IN_ALLOCA:
12182 }
12185 }
12187 /* Return true if T is a constant and the value cast to a target char
12188 can be represented by a host char.
12189 Store the casted char constant in *P if so. */
12191 bool
12193 {
12199 }
12201 /* Return true if the builtin DECL is implemented in a standard library.
12202 Otherwise returns false which doesn't guarantee it is not (thus the list of
12203 handled builtins below may be incomplete). */
12205 bool
12207 {
12210 {
12284 }
12286 }