| blob | 5d811f113c9071329a631aacd275d80ba6013c75 |
1 /* Expand builtin functions.
2 Copyright (C) 1988-2019 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. */
78 #if SWITCHABLE_TARGET
80 #endif
82 /* Define the names of the builtin function types and codes. */
86 #define DEF_BUILTIN(X, N, C, T, LT, B, F, NA, AT, IM, COND) #X,
88 {
90 };
92 /* Setup an array of builtin_info_type, make sure each element decl is
93 initialized to NULL_TREE. */
96 /* Non-zero if __builtin_constant_p should be folded right away. */
130 memop_ret retmode,
199 /* Return true if NAME starts with __builtin_ or __sync_. */
201 static bool
203 {
211 }
213 /* Return true if NODE should be considered for inline expansion regardless
214 of the optimization level. This means whenever a function is invoked with
215 its "internal" name, which normally contains the prefix "__builtin". */
217 bool
219 {
220 /* Note that we must use DECL_NAME, not DECL_ASSEMBLER_NAME_SET_P since
221 we want the name used to call the function, not the name it
222 will have. */
225 }
227 /* Compute values M and N such that M divides (address of EXP - N) and such
228 that N < M. If these numbers can be determined, store M in alignp and N in
229 *BITPOSP and return true. Otherwise return false and store BITS_PER_UNIT to
230 *alignp and any bit-offset to *bitposp.
232 Note that the address (and thus the alignment) computed here is based
233 on the address to which a symbol resolves, whereas DECL_ALIGN is based
234 on the address at which an object is actually located. These two
235 addresses are not always the same. For example, on ARM targets,
236 the address &foo of a Thumb function foo() has the lowest bit set,
237 whereas foo() itself starts on an even address.
239 If ADDR_P is true we are taking the address of the memory reference EXP
240 and thus cannot rely on the access taking place. */
242 static bool
245 {
247 tree offset;
248 machine_mode mode;
253 /* Get the innermost object and the constant (bitpos) and possibly
254 variable (offset) offset of the access. */
258 /* Extract alignment information from the innermost object and
259 possibly adjust bitpos and offset. */
261 {
262 /* Function addresses can encode extra information besides their
263 alignment. However, if TARGET_PTRMEMFUNC_VBIT_LOCATION
264 allows the low bit to be used as a virtual bit, we know
265 that the address itself must be at least 2-byte aligned. */
268 }
270 ;
272 {
273 /* The alignment of a CONST_DECL is determined by its initializer. */
280 }
282 {
285 }
289 {
295 /* If the address is explicitely aligned, handle that. */
298 {
303 }
305 known_alignment
309 /* Re-apply explicit alignment to the bitpos. */
312 /* The alignment of the pointer operand in a TARGET_MEM_REF
313 has to take the variable offset parts into account. */
315 {
317 {
322 }
326 }
328 /* When EXP is an actual memory reference then we can use
329 TYPE_ALIGN of a pointer indirection to derive alignment.
330 Do so only if get_pointer_alignment_1 did not reveal absolute
331 alignment knowledge and if using that alignment would
332 improve the situation. */
338 else
339 {
340 /* Else adjust bitpos accordingly. */
345 }
346 }
348 {
349 /* STRING_CST are the only constant objects we allow to be not
350 wrapped inside a CONST_DECL. */
356 }
358 /* If there is a non-constant offset part extract the maximum
359 alignment that can prevail. */
361 {
364 {
368 }
369 }
371 /* Account for the alignment of runtime coefficients, so that the constant
372 bitpos is guaranteed to be accurate. */
375 {
378 }
383 }
385 /* For a memory reference expression EXP compute values M and N such that M
386 divides (&EXP - N) and such that N < M. If these numbers can be determined,
387 store M in alignp and N in *BITPOSP and return true. Otherwise return false
388 and store BITS_PER_UNIT to *alignp and any bit-offset to *bitposp. */
390 bool
393 {
395 }
397 /* Return the alignment in bits of EXP, an object. */
399 unsigned int
401 {
407 /* align and bitpos now specify known low bits of the pointer.
408 ptr & (align - 1) == bitpos. */
413 }
415 /* For a pointer valued expression EXP compute values M and N such that M
416 divides (EXP - N) and such that N < M. If these numbers can be determined,
417 store M in alignp and N in *BITPOSP and return true. Return false if
418 the results are just a conservative approximation.
420 If EXP is not a pointer, false is returned too. */
422 bool
425 {
432 {
439 else
440 {
443 {
447 }
448 }
452 }
455 {
460 {
463 /* Make sure to return a sensible alignment when the multiplication
464 by BITS_PER_UNIT overflowed. */
467 /* We cannot really tell whether this result is an approximation. */
469 }
470 else
471 {
475 }
476 }
478 {
483 }
488 }
490 /* Return the alignment in bits of EXP, a pointer valued expression.
491 The alignment returned is, by default, the alignment of the thing that
492 EXP points to. If it is not a POINTER_TYPE, 0 is returned.
494 Otherwise, look at the expression to see if we can do better, i.e., if the
495 expression is actually pointing at an object whose alignment is tighter. */
497 unsigned int
499 {
505 /* align and bitpos now specify known low bits of the pointer.
506 ptr & (align - 1) == bitpos. */
512 }
514 /* Return the number of leading non-zero elements in the sequence
515 [ PTR, PTR + MAXELTS ) where each element's size is ELTSIZE bytes.
516 ELTSIZE must be a power of 2 less than 8. Used by c_strlen. */
518 unsigned
520 {
526 {
527 /* Optimize the common case of plain char. */
529 {
533 }
534 }
535 else
536 {
538 {
542 }
543 }
545 }
547 /* For a call at LOC to a function FN that expects a string in the argument
548 ARG, issue a diagnostic due to it being a called with an argument
549 declared at NONSTR that is a character array with no terminating NUL. */
551 void
553 {
561 {
565 }
566 }
568 /* If EXP refers to an unterminated constant character array return
569 the declaration of the object of which the array is a member or
570 element and if SIZE is not null, set *SIZE to the size of
571 the unterminated array and set *EXACT if the size is exact or
572 clear it otherwise. Otherwise return null. */
574 tree
576 {
577 /* C_STRLEN will return NULL and set DECL in the info
578 structure if EXP references a unterminated array. */
579 c_strlen_data lendata = { };
582 {
584 {
587 {
588 /* Constant offsets are already accounted for in LENDATA.MINLEN,
589 but not in a SSA_NAME + CST expression. */
594 {
595 /* Subtract the offset from the size of the array. */
600 }
601 else
603 }
604 else
608 }
610 }
613 }
615 /* Compute the length of a null-terminated character string or wide
616 character string handling character sizes of 1, 2, and 4 bytes.
617 TREE_STRING_LENGTH is not the right way because it evaluates to
618 the size of the character array in bytes (as opposed to characters)
619 and because it can contain a zero byte in the middle.
621 ONLY_VALUE should be nonzero if the result is not going to be emitted
622 into the instruction stream and zero if it is going to be expanded.
623 E.g. with i++ ? "foo" : "bar", if ONLY_VALUE is nonzero, constant 3
624 is returned, otherwise NULL, since
625 len = c_strlen (ARG, 1); if (len) expand_expr (len, ...); would not
626 evaluate the side-effects.
628 If ONLY_VALUE is two then we do not emit warnings about out-of-bound
629 accesses. Note that this implies the result is not going to be emitted
630 into the instruction stream.
632 Additional information about the string accessed may be recorded
633 in DATA. For example, if ARG references an unterminated string,
634 then the declaration will be stored in the DECL field. If the
635 length of the unterminated string can be determined, it'll be
636 stored in the LEN field. Note this length could well be different
637 than what a C strlen call would return.
639 ELTSIZE is 1 for normal single byte character strings, and 2 or
640 4 for wide characer strings. ELTSIZE is by default 1.
642 The value returned is of type `ssizetype'. */
644 tree
646 {
647 /* If we were not passed a DATA pointer, then get one to a local
648 structure. That avoids having to check DATA for NULL before
649 each time we want to use it. */
650 c_strlen_data local_strlen_data = { };
659 {
666 }
674 /* Offset from the beginning of the string in bytes. */
675 tree byteoff;
676 tree memsize;
677 tree decl;
682 /* Determine the size of the string element. */
686 /* Set MAXELTS to sizeof (SRC) / sizeof (*SRC) - 1, the maximum possible
687 length of SRC. Prefer TYPE_SIZE() to TREE_STRING_LENGTH() if possible
688 in case the latter is less than the size of the array, such as when
689 SRC refers to a short string literal used to initialize a large array.
690 In that case, the elements of the array after the terminating NUL are
691 all NUL. */
700 /* PTR can point to the byte representation of any string type, including
701 char* and wchar_t*. */
705 {
706 /* The code below works only for single byte character types. */
710 /* If the string has an internal NUL character followed by any
711 non-NUL characters (e.g., "foo\0bar"), we can't compute
712 the offset to the following NUL if we don't know where to
713 start searching for it. */
716 /* Return when an embedded null character is found or none at all.
717 In the latter case, set the DECL/LEN field in the DATA structure
718 so that callers may examine them. */
722 {
727 }
729 /* For empty strings the result should be zero. */
733 /* We don't know the starting offset, but we do know that the string
734 has no internal zero bytes. If the offset falls within the bounds
735 of the string subtract the offset from the length of the string,
736 and return that. Otherwise the length is zero. Take care to
737 use SAVE_EXPR in case the OFFSET has side-effects. */
744 offsave);
748 }
750 /* Offset from the beginning of the string in elements. */
751 HOST_WIDE_INT eltoff;
753 /* We have a known offset into the string. Start searching there for
754 a null character if we can represent it as a single HOST_WIDE_INT. */
759 else
762 /* If the offset is known to be out of bounds, warn, and call strlen at
763 runtime. */
765 {
766 /* Suppress multiple warnings for propagated constant strings. */
771 eltoff))
772 {
776 }
778 }
780 /* If eltoff is larger than strelts but less than maxelts the
781 string length is zero, since the excess memory will be zero. */
785 /* Use strlen to search for the first zero byte. Since any strings
786 constructed with build_string will have nulls appended, we win even
787 if we get handed something like (char[4])"abcd".
789 Since ELTOFF is our starting index into the string, no further
790 calculation is needed. */
794 /* Don't know what to return if there was no zero termination.
795 Ideally this would turn into a gcc_checking_assert over time.
796 Set DECL/LEN so callers can examine them. */
798 {
803 }
806 }
808 /* Return a constant integer corresponding to target reading
809 GET_MODE_BITSIZE (MODE) bits from string constant STR. If
810 NULL_TERMINATED_P, reading stops after '\0' character, all further ones
811 are assumed to be zero, otherwise it reads as many characters
812 as needed. */
814 rtx
817 {
818 HOST_WIDE_INT ch;
832 {
844 }
848 }
850 /* Cast a target constant CST to target CHAR and if that value fits into
851 host char type, return zero and put that value into variable pointed to by
852 P. */
854 static int
856 {
863 /* Do not care if it fits or not right here. */
878 }
880 /* Similar to save_expr, but assumes that arbitrary code is not executed
881 in between the multiple evaluations. In particular, we assume that a
882 non-addressable local variable will not be modified. */
884 static tree
886 {
894 }
896 /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
897 times to get the address of either a higher stack frame, or a return
898 address located within it (depending on FNDECL_CODE). */
900 static rtx
902 {
906 {
907 /* For a zero count with __builtin_return_address, we don't care what
908 frame address we return, because target-specific definitions will
909 override us. Therefore frame pointer elimination is OK, and using
910 the soft frame pointer is OK.
912 For a nonzero count, or a zero count with __builtin_frame_address,
913 we require a stable offset from the current frame pointer to the
914 previous one, so we must use the hard frame pointer, and
915 we must disable frame pointer elimination. */
918 else
919 {
922 /* Tell reload not to eliminate the frame pointer. */
924 }
925 }
930 /* On the SPARC, the return address is not in the frame, it is in a
931 register. There is no way to access it off of the current frame
932 pointer, but it can be accessed off the previous frame pointer by
933 reading the value from the register window save area. */
935 count--;
937 /* Scan back COUNT frames to the specified frame. */
939 {
940 /* Assume the dynamic chain pointer is in the word that the
941 frame address points to, unless otherwise specified. */
946 }
948 /* For __builtin_frame_address, return what we've got. But, on
949 the SPARC for example, we may have to add a bias. */
953 /* For __builtin_return_address, get the return address from that frame. */
954 #ifdef RETURN_ADDR_RTX
956 #else
960 #endif
962 }
964 /* Alias set used for setjmp buffer. */
967 /* Construct the leading half of a __builtin_setjmp call. Control will
968 return to RECEIVER_LABEL. This is also called directly by the SJLJ
969 exception handling code. */
971 void
973 {
975 rtx stack_save;
976 rtx mem;
985 /* We store the frame pointer and the address of receiver_label in
986 the buffer and use the rest of it for the stack save area, which
987 is machine-dependent. */
1006 /* If there is further processing to do, do it. */
1010 /* We have a nonlocal label. */
1012 }
1014 /* Construct the trailing part of a __builtin_setjmp call. This is
1015 also called directly by the SJLJ exception handling code.
1016 If RECEIVER_LABEL is NULL, instead contruct a nonlocal goto handler. */
1018 void
1020 {
1021 rtx chain;
1023 /* Mark the FP as used when we get here, so we have to make sure it's
1024 marked as used by this function. */
1027 /* Mark the static chain as clobbered here so life information
1028 doesn't get messed up for it. */
1034 {
1035 /* If the argument pointer can be eliminated in favor of the
1036 frame pointer, we don't need to restore it. We assume here
1037 that if such an elimination is present, it can always be used.
1038 This is the case on all known machines; if we don't make this
1039 assumption, we do unnecessary saving on many machines. */
1049 {
1050 /* Now restore our arg pointer from the address at which it
1051 was saved in our stack frame. */
1054 }
1055 }
1061 else
1064 /* We must not allow the code we just generated to be reordered by
1065 scheduling. Specifically, the update of the frame pointer must
1066 happen immediately, not later. */
1068 }
1070 /* __builtin_longjmp is passed a pointer to an array of five words (not
1071 all will be used on all machines). It operates similarly to the C
1072 library function of the same name, but is more efficient. Much of
1073 the code below is copied from the handling of non-local gotos. */
1075 static void
1077 {
1082 /* DRAP is needed for stack realign if longjmp is expanded to current
1083 function */
1094 /* We require that the user must pass a second argument of 1, because
1095 that is what builtin_setjmp will return. */
1101 else
1102 {
1113 /* Pick up FP, label, and SP from the block and jump. This code is
1114 from expand_goto in stmt.c; see there for detailed comments. */
1116 /* We have to pass a value to the nonlocal_goto pattern that will
1117 get copied into the static_chain pointer, but it does not matter
1118 what that value is, because builtin_setjmp does not use it. */
1120 else
1121 {
1127 /* Restore the frame pointer and stack pointer. We must use a
1128 temporary since the setjmp buffer may be a local. */
1132 /* Ensure the frame pointer move is not optimized. */
1141 }
1142 }
1144 /* Search backwards and mark the jump insn as a non-local goto.
1145 Note that this precludes the use of __builtin_longjmp to a
1146 __builtin_setjmp target in the same function. However, we've
1147 already cautioned the user that these functions are for
1148 internal exception handling use only. */
1150 {
1154 {
1157 }
1160 }
1161 }
1165 {
1167 }
1169 /* This function validates the types of a function call argument list
1170 against a specified list of tree_codes. If the last specifier is a 0,
1171 that represents an ellipsis, otherwise the last specifier must be a
1172 VOID_TYPE. */
1174 static bool
1176 {
1180 const_call_expr_arg_iterator iter;
1181 const_tree arg;
1186 /* Get a bitmap of pointer argument numbers declared attribute nonnull. */
1191 {
1195 {
1197 /* This signifies an ellipses, any further arguments are all ok. */
1201 /* This signifies an endlink, if no arguments remain, return
1202 true, otherwise return false. */
1206 /* The actual argument must be nonnull when either the whole
1207 called function has been declared nonnull, or when the formal
1208 argument corresponding to the actual argument has been. */
1211 {
1216 }
1217 /* FALLTHRU */
1219 /* If no parameters remain or the parameter's code does not
1220 match the specified code, return false. Otherwise continue
1221 checking any remaining arguments. */
1226 }
1227 }
1229 /* We need gotos here since we can only have one VA_CLOSE in a
1230 function. */
1231 end: ;
1237 }
1239 /* Expand a call to __builtin_nonlocal_goto. We're passed the target label
1240 and the address of the save area. */
1242 static rtx
1244 {
1259 /* Copy the address of the save location to a register just in case it was
1260 based on the frame pointer. */
1269 /* ??? We no longer need to pass the static chain value, afaik. */
1272 else
1273 {
1279 /* Restore the frame pointer and stack pointer. We must use a
1280 temporary since the setjmp buffer may be a local. */
1284 /* Ensure the frame pointer move is not optimized. */
1290 /* USE of hard_frame_pointer_rtx added for consistency;
1291 not clear if really needed. */
1295 /* If the architecture is using a GP register, we must
1296 conservatively assume that the target function makes use of it.
1297 The prologue of functions with nonlocal gotos must therefore
1298 initialize the GP register to the appropriate value, and we
1299 must then make sure that this value is live at the point
1300 of the jump. (Note that this doesn't necessarily apply
1301 to targets with a nonlocal_goto pattern; they are free
1302 to implement it in their own way. Note also that this is
1303 a no-op if the GP register is a global invariant.) */
1309 }
1311 /* Search backwards to the jump insn and mark it as a
1312 non-local goto. */
1314 {
1316 {
1319 }
1322 }
1325 }
1327 /* __builtin_update_setjmp_buf is passed a pointer to an array of five words
1328 (not all will be used on all machines) that was passed to __builtin_setjmp.
1329 It updates the stack pointer in that block to the current value. This is
1330 also called directly by the SJLJ exception handling code. */
1332 void
1334 {
1337 rtx stack_save
1339 memory_address
1345 }
1347 /* Expand a call to __builtin_prefetch. For a target that does not support
1348 data prefetch, evaluate the memory address argument in case it has side
1349 effects. */
1351 static void
1353 {
1363 /* Arguments 1 and 2 are optional; argument 1 (read/write) defaults to
1364 zero (read) and argument 2 (locality) defaults to 3 (high degree of
1365 locality). */
1369 else
1373 else
1376 /* Argument 0 is an address. */
1379 /* Argument 1 (read/write flag) must be a compile-time constant int. */
1381 {
1384 }
1386 /* Argument 1 must be either zero or one. */
1388 {
1392 }
1394 /* Argument 2 (locality) must be a compile-time constant int. */
1396 {
1399 }
1401 /* Argument 2 must be 0, 1, 2, or 3. */
1403 {
1406 }
1409 {
1417 }
1419 /* Don't do anything with direct references to volatile memory, but
1420 generate code to handle other side effects. */
1423 }
1425 /* Get a MEM rtx for expression EXP which is the address of an operand
1426 to be used in a string instruction (cmpstrsi, cpymemsi, ..). LEN is
1427 the maximum length of the block of memory that might be accessed or
1428 NULL if unknown. */
1430 static rtx
1432 {
1436 /* When EXP is not resolved SAVE_EXPR, MEM_ATTRS can be still derived
1437 from its expression, for expr->a.b only <variable>.a.b is recorded. */
1444 /* Get an expression we can use to find the attributes to assign to MEM.
1445 First remove any nops. */
1450 /* Build a MEM_REF representing the whole accessed area as a byte blob,
1451 (as builtin stringops may alias with anything). */
1458 /* If the MEM_REF has no acceptable address, try to get the base object
1459 from the original address we got, and build an all-aliasing
1460 unknown-sized access to that one. */
1466 {
1471 size_zero_node,
1472 NULL)),
1475 }
1478 }
1479 \f
1480 /* Built-in functions to perform an untyped call and return. */
1482 #define apply_args_mode \
1483 (this_target_builtins->x_apply_args_mode)
1484 #define apply_result_mode \
1485 (this_target_builtins->x_apply_result_mode)
1487 /* Return the size required for the block returned by __builtin_apply_args,
1488 and initialize apply_args_mode. */
1490 static int
1492 {
1497 /* The values computed by this function never change. */
1499 {
1500 /* The first value is the incoming arg-pointer. */
1503 /* The second value is the structure value address unless this is
1504 passed as an "invisible" first argument. */
1510 {
1520 }
1521 else
1522 {
1524 }
1525 }
1527 }
1529 /* Return the size required for the block returned by __builtin_apply,
1530 and initialize apply_result_mode. */
1532 static int
1534 {
1538 /* The values computed by this function never change. */
1540 {
1545 {
1555 }
1556 else
1559 /* Allow targets that use untyped_call and untyped_return to override
1560 the size so that machine-specific information can be stored here. */
1561 #ifdef APPLY_RESULT_SIZE
1563 #endif
1564 }
1566 }
1568 /* Create a vector describing the result block RESULT. If SAVEP is true,
1569 the result block is used to save the values; otherwise it is used to
1570 restore the values. */
1572 static rtx
1574 {
1576 fixed_size_mode mode;
1583 {
1593 }
1595 }
1597 /* Save the state required to perform an untyped call with the same
1598 arguments as were passed to the current function. */
1600 static rtx
1602 {
1605 fixed_size_mode mode;
1606 rtx struct_incoming_value = targetm.calls.struct_value_rtx (cfun ? TREE_TYPE (cfun->decl) : 0, 1);
1608 /* Create a block where the arg-pointer, structure value address,
1609 and argument registers can be saved. */
1612 /* Walk past the arg-pointer and structure value address. */
1617 /* Save each register used in calling a function to the block. */
1620 {
1629 }
1631 /* Save the arg pointer to the block. */
1633 /* We need the pointer as the caller actually passed them to us, not
1634 as we might have pretended they were passed. Make sure it's a valid
1635 operand, as emit_move_insn isn't expected to handle a PLUS. */
1637 tem
1640 NULL_RTX);
1645 /* Save the structure value address unless this is passed as an
1646 "invisible" first argument. */
1651 /* Return the address of the block. */
1653 }
1655 /* __builtin_apply_args returns block of memory allocated on
1656 the stack into which is stored the arg pointer, structure
1657 value address, static chain, and all the registers that might
1658 possibly be used in performing a function call. The code is
1659 moved to the start of the function so the incoming values are
1660 saved. */
1662 static rtx
1664 {
1665 /* Don't do __builtin_apply_args more than once in a function.
1666 Save the result of the first call and reuse it. */
1669 {
1670 /* When this function is called, it means that registers must be
1671 saved on entry to this function. So we migrate the
1672 call to the first insn of this function. */
1673 rtx temp;
1682 /* Put the insns after the NOTE that starts the function.
1683 If this is inside a start_sequence, make the outer-level insn
1684 chain current, so the code is placed at the start of the
1685 function. If internal_arg_pointer is a non-virtual pseudo,
1686 it needs to be placed after the function that initializes
1687 that pseudo. */
1692 else
1696 }
1697 }
1699 /* Perform an untyped call and save the state required to perform an
1700 untyped return of whatever value was returned by the given function. */
1702 static rtx
1704 {
1706 fixed_size_mode mode;
1715 /* Create a block where the return registers can be saved. */
1718 /* Fetch the arg pointer from the ARGUMENTS block. */
1725 /* Push a new argument block and copy the arguments. Do not allow
1726 the (potential) memcpy call below to interfere with our stack
1727 manipulations. */
1729 NO_DEFER_POP;
1731 /* Save the stack with nonlocal if available. */
1734 else
1737 /* Allocate a block of memory onto the stack and copy the memory
1738 arguments to the outgoing arguments address. We can pass TRUE
1739 as the 4th argument because we just saved the stack pointer
1740 and will restore it right after the call. */
1743 /* Set DRAP flag to true, even though allocate_dynamic_stack_space
1744 may have already set current_function_calls_alloca to true.
1745 current_function_calls_alloca won't be set if argsize is zero,
1746 so we have to guarantee need_drap is true here. */
1752 {
1755 else
1757 }
1764 /* Refer to the argument block. */
1769 /* Walk past the arg-pointer and structure value address. */
1774 /* Restore each of the registers previously saved. Make USE insns
1775 for each of these registers for use in making the call. */
1778 {
1786 }
1788 /* Restore the structure value address unless this is passed as an
1789 "invisible" first argument. */
1792 {
1798 }
1800 /* All arguments and registers used for the call are set up by now! */
1803 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
1804 and we don't want to load it into a register as an optimization,
1805 because prepare_call_address already did it if it should be done. */
1809 /* Generate the actual call instruction and save the return value. */
1811 {
1815 }
1817 {
1820 /* Locate the unique return register. It is not possible to
1821 express a call that sets more than one return register using
1822 call_value; use untyped_call for that. In fact, untyped_call
1823 only needs to save the return registers in the given block. */
1826 {
1830 }
1837 }
1838 else
1841 /* Find the CALL insn we just emitted, and attach the register usage
1842 information. */
1846 /* Restore the stack. */
1849 else
1853 OK_DEFER_POP;
1855 /* Return the address of the result block. */
1858 }
1860 /* Perform an untyped return. */
1862 static void
1864 {
1866 fixed_size_mode mode;
1867 rtx reg;
1876 {
1881 }
1883 /* Restore the return value and note that each value is used. */
1887 {
1899 }
1901 /* Put the USE insns before the return. */
1904 /* Return whatever values was restored by jumping directly to the end
1905 of the function. */
1907 }
1909 /* Used by expand_builtin_classify_type and fold_builtin_classify_type. */
1911 static enum type_class
1913 {
1915 {
1934 }
1935 }
1937 /* Expand a call EXP to __builtin_classify_type. */
1939 static rtx
1941 {
1945 }
1947 /* This helper macro, meant to be used in mathfn_built_in below, determines
1948 which among a set of builtin math functions is appropriate for a given type
1949 mode. The `F' (float) and `L' (long double) are automatically generated
1950 from the 'double' case. If a function supports the _Float<N> and _Float<N>X
1951 types, there are additional types that are considered with 'F32', 'F64',
1952 'F128', etc. suffixes. */
1953 #define CASE_MATHFN(MATHFN) \
1954 CASE_CFN_##MATHFN: \
1955 fcode = BUILT_IN_##MATHFN; fcodef = BUILT_IN_##MATHFN##F ; \
1956 fcodel = BUILT_IN_##MATHFN##L ; break;
1957 /* Similar to the above, but also add support for the _Float<N> and _Float<N>X
1958 types. */
1959 #define CASE_MATHFN_FLOATN(MATHFN) \
1960 CASE_CFN_##MATHFN: \
1961 fcode = BUILT_IN_##MATHFN; fcodef = BUILT_IN_##MATHFN##F ; \
1962 fcodel = BUILT_IN_##MATHFN##L ; fcodef16 = BUILT_IN_##MATHFN##F16 ; \
1963 fcodef32 = BUILT_IN_##MATHFN##F32; fcodef64 = BUILT_IN_##MATHFN##F64 ; \
1964 fcodef128 = BUILT_IN_##MATHFN##F128 ; fcodef32x = BUILT_IN_##MATHFN##F32X ; \
1965 fcodef64x = BUILT_IN_##MATHFN##F64X ; fcodef128x = BUILT_IN_##MATHFN##F128X ;\
1966 break;
1967 /* Similar to above, but appends _R after any F/L suffix. */
1968 #define CASE_MATHFN_REENT(MATHFN) \
1969 case CFN_BUILT_IN_##MATHFN##_R: \
1970 case CFN_BUILT_IN_##MATHFN##F_R: \
1971 case CFN_BUILT_IN_##MATHFN##L_R: \
1972 fcode = BUILT_IN_##MATHFN##_R; fcodef = BUILT_IN_##MATHFN##F_R ; \
1973 fcodel = BUILT_IN_##MATHFN##L_R ; break;
1975 /* Return a function equivalent to FN but operating on floating-point
1976 values of type TYPE, or END_BUILTINS if no such function exists.
1977 This is purely an operation on function codes; it does not guarantee
1978 that the target actually has an implementation of the function. */
1980 static built_in_function
1982 {
1983 tree mtype;
1994 {
2086 }
2109 else
2111 }
2113 /* Return mathematic function equivalent to FN but operating directly on TYPE,
2114 if available. If IMPLICIT_P is true use the implicit builtin declaration,
2115 otherwise use the explicit declaration. If we can't do the conversion,
2116 return null. */
2118 static tree
2120 {
2129 }
2131 /* Like mathfn_built_in_1, but always use the implicit array. */
2133 tree
2135 {
2137 }
2139 /* Like mathfn_built_in_1, but take a built_in_function and
2140 always use the implicit array. */
2142 tree
2144 {
2146 }
2148 /* If BUILT_IN_NORMAL function FNDECL has an associated internal function,
2149 return its code, otherwise return IFN_LAST. Note that this function
2150 only tests whether the function is defined in internals.def, not whether
2151 it is actually available on the target. */
2153 internal_fn
2155 {
2159 {
2160 #define DEF_INTERNAL_FLT_FN(NAME, FLAGS, OPTAB, TYPE) \
2161 CASE_FLT_FN (BUILT_IN_##NAME): return IFN_##NAME;
2162 #define DEF_INTERNAL_FLT_FLOATN_FN(NAME, FLAGS, OPTAB, TYPE) \
2163 CASE_FLT_FN (BUILT_IN_##NAME): return IFN_##NAME; \
2164 CASE_FLT_FN_FLOATN_NX (BUILT_IN_##NAME): return IFN_##NAME;
2165 #define DEF_INTERNAL_INT_FN(NAME, FLAGS, OPTAB, TYPE) \
2166 CASE_INT_FN (BUILT_IN_##NAME): return IFN_##NAME;
2183 }
2184 }
2186 /* If CALL is a call to a BUILT_IN_NORMAL function that could be replaced
2187 on the current target by a call to an internal function, return the
2188 code of that internal function, otherwise return IFN_LAST. The caller
2189 is responsible for ensuring that any side-effects of the built-in
2190 call are dealt with correctly. E.g. if CALL sets errno, the caller
2191 must decide that the errno result isn't needed or make it available
2192 in some other way. */
2194 internal_fn
2196 {
2198 {
2201 {
2206 }
2207 }
2209 }
2211 /* Expand a call to the builtin trinary math functions (fma).
2212 Return NULL_RTX if a normal call should be emitted rather than expanding the
2213 function in-line. EXP is the expression that is a call to the builtin
2214 function; if convenient, the result should be placed in TARGET.
2215 SUBTARGET may be used as the target for computing one of EXP's
2216 operands. */
2218 static rtx
2220 {
2221 optab builtin_optab;
2226 machine_mode mode;
2236 {
2242 }
2244 /* Make a suitable register to place result in. */
2247 /* Before working hard, check whether the instruction is available. */
2253 /* Always stabilize the argument list. */
2264 /* Compute into RESULT.
2265 Set RESULT to wherever the result comes back. */
2269 /* If we were unable to expand via the builtin, stop the sequence
2270 (without outputting the insns) and call to the library function
2271 with the stabilized argument list. */
2273 {
2276 }
2278 /* Output the entire sequence. */
2284 }
2286 /* Expand a call to the builtin sin and cos math functions.
2287 Return NULL_RTX if a normal call should be emitted rather than expanding the
2288 function in-line. EXP is the expression that is a call to the builtin
2289 function; if convenient, the result should be placed in TARGET.
2290 SUBTARGET may be used as the target for computing one of EXP's
2291 operands. */
2293 static rtx
2295 {
2296 optab builtin_optab;
2297 rtx op0;
2300 machine_mode mode;
2301 tree arg;
2309 {
2315 }
2317 /* Make a suitable register to place result in. */
2320 /* Check if sincos insn is available, otherwise fallback
2321 to sin or cos insn. */
2324 {
2331 }
2333 /* Before working hard, check whether the instruction is available. */
2335 {
2338 /* Wrap the computation of the argument in a SAVE_EXPR, as we may
2339 need to expand the argument again. This way, we will not perform
2340 side-effects more the once. */
2347 /* Compute into RESULT.
2348 Set RESULT to wherever the result comes back. */
2350 {
2354 {
2363 }
2365 }
2366 else
2370 {
2371 /* Output the entire sequence. */
2376 }
2378 /* If we were unable to expand via the builtin, stop the sequence
2379 (without outputting the insns) and call to the library function
2380 with the stabilized argument list. */
2382 }
2385 }
2387 /* Given an interclass math builtin decl FNDECL and it's argument ARG
2388 return an RTL instruction code that implements the functionality.
2389 If that isn't possible or available return CODE_FOR_nothing. */
2391 static enum insn_code
2393 {
2396 machine_mode mode;
2399 {
2413 /* These builtins have no optabs (yet). */
2417 }
2419 /* There's no easy way to detect the case we need to set EDOM. */
2423 /* Optab mode depends on the mode of the input argument. */
2429 }
2431 /* Expand a call to one of the builtin math functions that operate on
2432 floating point argument and output an integer result (ilogb, isinf,
2433 isnan, etc).
2434 Return 0 if a normal call should be emitted rather than expanding the
2435 function in-line. EXP is the expression that is a call to the builtin
2436 function; if convenient, the result should be placed in TARGET. */
2438 static rtx
2440 {
2442 rtx op0;
2444 machine_mode mode;
2445 tree arg;
2455 {
2460 /* Wrap the computation of the argument in a SAVE_EXPR, as we may
2461 need to expand the argument again. This way, we will not perform
2462 side-effects more the once. */
2477 }
2480 }
2482 /* Expand a call to the builtin sincos math function.
2483 Return NULL_RTX if a normal call should be emitted rather than expanding the
2484 function in-line. EXP is the expression that is a call to the builtin
2485 function. */
2487 static rtx
2489 {
2491 machine_mode mode;
2505 /* Make a suitable register to place result in. */
2508 /* Check if sincos insn is available, otherwise emit the call. */
2523 /* Compute into target1 and target2.
2524 Set TARGET to wherever the result comes back. */
2528 /* Move target1 and target2 to the memory locations indicated
2529 by op1 and op2. */
2534 }
2536 /* Expand a call to the internal cexpi builtin to the sincos math function.
2537 EXP is the expression that is a call to the builtin function; if convenient,
2538 the result should be placed in TARGET. */
2540 static rtx
2542 {
2545 machine_mode mode;
2556 /* Try expanding via a sincos optab, fall back to emitting a libcall
2557 to sincos or cexp. We are sure we have sincos or cexp because cexpi
2558 is only generated from sincos, cexp or if we have either of them. */
2560 {
2566 /* Compute into op1 and op2. */
2568 }
2570 {
2581 else
2591 /* Make sure not to fold the sincos call again. */
2595 }
2596 else
2597 {
2607 else
2610 /* If we don't have a decl for cexp create one. This is the
2611 friendliest fallback if the user calls __builtin_cexpi
2612 without full target C99 function support. */
2614 {
2615 tree fntype;
2627 }
2632 /* Make sure not to fold the cexp call again. */
2636 }
2638 /* Now build the proper return type. */
2643 }
2645 /* Conveniently construct a function call expression. FNDECL names the
2646 function to be called, N is the number of arguments, and the "..."
2647 parameters are the argument expressions. Unlike build_call_exr
2648 this doesn't fold the call, hence it will always return a CALL_EXPR. */
2650 static tree
2652 {
2662 }
2664 /* Expand a call to one of the builtin rounding functions gcc defines
2665 as an extension (lfloor and lceil). As these are gcc extensions we
2666 do not need to worry about setting errno to EDOM.
2667 If expanding via optab fails, lower expression to (int)(floor(x)).
2668 EXP is the expression that is a call to the builtin function;
2669 if convenient, the result should be placed in TARGET. */
2671 static rtx
2673 {
2674 convert_optab builtin_optab;
2679 tree fallback_fndecl;
2680 machine_mode mode;
2681 tree arg;
2689 {
2706 }
2708 /* Make a suitable register to place result in. */
2713 /* Wrap the computation of the argument in a SAVE_EXPR, as we may
2714 need to expand the argument again. This way, we will not perform
2715 side-effects more the once. */
2722 /* Compute into TARGET. */
2724 {
2725 /* Output the entire sequence. */
2730 }
2732 /* If we were unable to expand via the builtin, stop the sequence
2733 (without outputting the insns). */
2736 /* Fall back to floating point rounding optab. */
2739 /* For non-C99 targets we may end up without a fallback fndecl here
2740 if the user called __builtin_lfloor directly. In this case emit
2741 a call to the floor/ceil variants nevertheless. This should result
2742 in the best user experience for not full C99 targets. */
2744 {
2745 tree fntype;
2749 {
2782 }
2787 }
2794 /* Truncate the result of floating point optab to integer
2795 via expand_fix (). */
2800 }
2802 /* Expand a call to one of the builtin math functions doing integer
2803 conversion (lrint).
2804 Return 0 if a normal call should be emitted rather than expanding the
2805 function in-line. EXP is the expression that is a call to the builtin
2806 function; if convenient, the result should be placed in TARGET. */
2808 static rtx
2810 {
2811 convert_optab builtin_optab;
2812 rtx op0;
2815 tree arg;
2816 machine_mode mode;
2825 {
2844 }
2846 /* There's no easy way to detect the case we need to set EDOM. */
2850 /* Make a suitable register to place result in. */
2853 /* There's no easy way to detect the case we need to set EDOM. */
2855 {
2858 /* Wrap the computation of the argument in a SAVE_EXPR, as we may
2859 need to expand the argument again. This way, we will not perform
2860 side-effects more the once. */
2868 {
2869 /* Output the entire sequence. */
2874 }
2876 /* If we were unable to expand via the builtin, stop the sequence
2877 (without outputting the insns) and call to the library function
2878 with the stabilized argument list. */
2880 }
2883 {
2884 /* Fall back to rounding to long int. Use implicit_p 0 - for non-C99
2885 targets, (int) round (x) should never be transformed into
2886 BUILT_IN_IROUND and if __builtin_iround is called directly, emit
2887 a call to lround in the hope that the target provides at least some
2888 C99 functions. This should result in the best user experience for
2889 not full C99 targets. */
2890 tree fallback_fndecl = mathfn_built_in_1
2899 }
2902 }
2904 /* Expand a call to the powi built-in mathematical function. Return NULL_RTX if
2905 a normal call should be emitted rather than expanding the function
2906 in-line. EXP is the expression that is a call to the builtin
2907 function; if convenient, the result should be placed in TARGET. */
2909 static rtx
2911 {
2914 machine_mode mode;
2915 machine_mode mode2;
2924 /* Emit a libcall to libgcc. */
2926 /* Mode of the 2nd argument must match that of an int. */
2944 }
2946 /* Expand expression EXP which is a call to the strlen builtin. Return
2947 NULL_RTX if we failed and the caller should emit a normal call, otherwise
2948 try to get the result in TARGET, if convenient. */
2950 static rtx
2952 machine_mode target_mode)
2953 {
2958 rtx pat;
2959 tree len;
2961 rtx src_reg;
2963 machine_mode insn_mode;
2967 /* If the length can be computed at compile-time, return it. */
2972 /* If the length can be computed at compile-time and is constant
2973 integer, but there are side-effects in src, evaluate
2974 src for side-effects, then return len.
2975 E.g. x = strlen (i++ ? "xfoo" + 1 : "bar");
2976 can be optimized into: i++; x = 3; */
2979 {
2982 }
2986 /* If SRC is not a pointer type, don't do this operation inline. */
2990 /* Bail out if we can't compute strlen in the right mode. */
2992 {
2996 }
3000 /* Make a place to hold the source address. We will not expand
3001 the actual source until we are sure that the expansion will
3002 not fail -- there are trees that cannot be expanded twice. */
3005 /* Mark the beginning of the strlen sequence so we can emit the
3006 source operand later. */
3016 /* Check to see if the argument was declared attribute nonstring
3017 and if so, issue a warning since at this point it's not known
3018 to be nul-terminated. */
3021 /* Now that we are assured of success, expand the source. */
3025 {
3026 #ifdef POINTERS_EXTEND_UNSIGNED
3029 POINTERS_EXTEND_UNSIGNED);
3030 #endif
3032 }
3038 else
3041 /* Return the value in the proper mode for this function. */
3046 else
3050 }
3052 /* Expand call EXP to the strnlen built-in, returning the result
3053 and setting it in TARGET. Otherwise return NULL_RTX on failure. */
3055 static rtx
3057 {
3074 /* FIXME: Change c_strlen() to return sizetype instead of ssizetype
3075 so these conversions aren't necessary. */
3076 c_strlen_data lendata = { };
3082 {
3086 "%K%qD specified bound %E "
3093 {
3094 /* Clear EXACT if LEN may be less than SRC suggests,
3095 such as in
3096 strnlen (&a[i], sizeof a)
3097 where the value of i is unknown. Unless i's value is
3098 zero, the call is unsafe because the bound is greater. */
3102 }
3108 {
3109 location_t warnloc
3113 exact
3119 {
3124 }
3125 }
3132 }
3145 "%K%qD specified bound [%wu, %wu] "
3152 {
3156 }
3162 {
3163 location_t warnloc
3167 exact
3173 {
3177 }
3178 }
3188 }
3190 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
3191 bytes from constant string DATA + OFFSET and return it as target
3192 constant. */
3194 static rtx
3196 scalar_int_mode mode)
3197 {
3205 }
3207 /* LEN specify length of the block of memcpy/memset operation.
3208 Figure out its range and put it into MIN_SIZE/MAX_SIZE.
3209 In some cases we can make very likely guess on max size, then we
3210 set it into PROBABLE_MAX_SIZE. */
3212 static void
3217 {
3219 {
3222 }
3223 else
3224 {
3228 /* Determine bounds from the type. */
3231 else
3236 else
3242 {
3247 }
3249 {
3250 /* Anti range 0...N lets us to determine minimal size to N+1. */
3252 {
3255 }
3256 /* Code like
3258 int n;
3259 if (n < 100)
3260 memcpy (a, b, n)
3262 Produce anti range allowing negative values of N. We still
3263 can use the information and make a guess that N is not negative.
3264 */
3267 }
3268 }
3272 }
3274 /* Try to verify that the sizes and lengths of the arguments to a string
3275 manipulation function given by EXP are within valid bounds and that
3276 the operation does not lead to buffer overflow or read past the end.
3277 Arguments other than EXP may be null. When non-null, the arguments
3278 have the following meaning:
3279 DST is the destination of a copy call or NULL otherwise.
3280 SRC is the source of a copy call or NULL otherwise.
3281 DSTWRITE is the number of bytes written into the destination obtained
3282 from the user-supplied size argument to the function (such as in
3283 memcpy(DST, SRCs, DSTWRITE) or strncpy(DST, DRC, DSTWRITE).
3284 MAXREAD is the user-supplied bound on the length of the source sequence
3285 (such as in strncat(d, s, N). It specifies the upper limit on the number
3286 of bytes to write. If NULL, it's taken to be the same as DSTWRITE.
3287 SRCSTR is the source string (such as in strcpy(DST, SRC)) when the
3288 expression EXP is a string function call (as opposed to a memory call
3289 like memcpy). As an exception, SRCSTR can also be an integer denoting
3290 the precomputed size of the source string or object (for functions like
3291 memcpy).
3292 DSTSIZE is the size of the destination object specified by the last
3293 argument to the _chk builtins, typically resulting from the expansion
3294 of __builtin_object_size (such as in __builtin___strcpy_chk(DST, SRC,
3295 DSTSIZE).
3297 When DSTWRITE is null LEN is checked to verify that it doesn't exceed
3298 SIZE_MAX.
3300 If the call is successfully verified as safe return true, otherwise
3301 return false. */
3303 static bool
3306 {
3309 /* The size of the largest object is half the address space, or
3310 PTRDIFF_MAX. (This is way too permissive.) */
3313 /* Either the length of the source string for string functions or
3314 the size of the source object for raw memory functions. */
3319 /* Set to true when the exact number of bytes written by a string
3320 function like strcpy is not known and the only thing that is
3321 known is that it must be at least one (for the terminating nul). */
3324 {
3325 /* SRCSTR is normally a pointer to string but as a special case
3326 it can be an integer denoting the length of a string. */
3328 {
3329 /* Try to determine the range of lengths the source string
3330 refers to. If it can be determined and is less than
3331 the upper bound given by MAXREAD add one to it for
3332 the terminating nul. Otherwise, set it to one for
3333 the same reason, or to MAXREAD as appropriate. */
3334 c_strlen_data lendata = { };
3339 {
3342 else
3353 }
3354 else
3355 {
3358 }
3359 }
3360 else
3362 }
3365 {
3366 /* When the only available piece of data is the object size
3367 there is nothing to do. */
3371 /* Otherwise, when the length of the source sequence is known
3372 (as with strlen), set DSTWRITE to it. */
3375 }
3385 /* First check the number of bytes to be written against the maximum
3386 object size. */
3390 {
3400 "%K%qD specified size %E "
3403 else
3405 "%K%qD specified size between %E and %E "
3413 }
3415 /* The number of bytes to write is "exact" if DSTWRITE is non-null,
3416 constant, and in range of unsigned HOST_WIDE_INT. */
3419 /* Next check the number of bytes to be written against the destination
3420 object size. */
3422 {
3427 || (dstwrite
3430 {
3438 {
3439 /* This is a call to strcpy with a destination of 0 size
3440 and a source of unknown length. The call will write
3441 at least one byte past the end of the destination. */
3443 "%K%qD writing %E or more bytes into a region "
3446 }
3449 "%K%qD writing %E byte into a region "
3451 "%K%qD writing %E bytes into a region "
3455 {
3456 /* Avoid printing the upper bound if it's invalid. */
3458 "%K%qD writing %E or more bytes into a region "
3461 }
3462 else
3464 "%K%qD writing between %E and %E bytes into "
3467 dstsize);
3469 /* Return error when an overflow has been detected. */
3471 }
3472 }
3474 /* Check the maximum length of the source sequence against the size
3475 of the destination object if known, or against the maximum size
3476 of an object. */
3478 {
3481 {
3486 {
3490 /* Warn about crazy big sizes first since that's more
3491 likely to be meaningful than saying that the bound
3492 is greater than the object size if both are big. */
3495 "%K%qD specified bound %E "
3499 else
3501 "%K%qD specified bound between %E and %E "
3507 }
3510 {
3516 "%K%qD specified bound %E "
3520 else
3522 "%K%qD specified bound between %E and %E "
3527 }
3528 }
3529 }
3531 /* Check for reading past the end of SRC. */
3536 {
3548 {
3549 /* Avoid printing the upper bound if it's invalid. */
3551 "%K%qD reading %E or more bytes from a region "
3554 }
3555 else
3557 "%K%qD reading between %E and %E bytes from a region "
3561 }
3564 }
3566 /* Helper to compute the size of the object referenced by the DEST
3567 expression which must have pointer type, using Object Size type
3568 OSTYPE (only the least significant 2 bits are used). Return
3569 an estimate of the size of the object if successful or NULL when
3570 the size cannot be determined. When the referenced object involves
3571 a non-constant offset in some range the returned value represents
3572 the largest size given the smallest non-negative offset in the
3573 range. If nonnull, set *PDECL to the decl of the referenced
3574 subobject if it can be determined, or to null otherwise.
3575 The function is intended for diagnostics and should not be used
3576 to influence code generation or optimization. */
3578 tree
3580 {
3587 /* Only the two least significant bits are meaningful. */
3594 {
3603 {
3604 /* compute_builtin_object_size fails for addresses with
3605 non-constant offsets. Try to determine the range of
3606 such an offset here and use it to adjust the constant
3607 size. */
3610 {
3612 {
3616 /* Ignore negative offsets for now. For others,
3617 use the lower bound as the most optimistic
3618 estimate of the (remaining) size. */
3620 ;
3624 else
3626 }
3627 }
3630 {
3635 {
3637 {
3640 /* Ignore negative offsets for now. For others,
3641 use the lower bound as the most optimistic
3642 estimate of the (remaining)size. */
3645 ;
3649 else
3651 }
3652 }
3653 }
3654 }
3657 }
3659 /* Unless computing the largest size (for memcpy and other raw memory
3660 functions), try to determine the size of the object from its type. */
3666 {
3670 {
3671 /* If the declaration of the destination object is known
3672 to have zero size, return zero. */
3681 {
3685 else
3687 }
3692 }
3695 }
3698 {
3701 }
3708 {
3711 }
3721 {
3724 }
3727 }
3729 /* Helper to determine and check the sizes of the source and the destination
3730 of calls to __builtin_{bzero,memcpy,mempcpy,memset} calls. EXP is the
3731 call expression, DEST is the destination argument, SRC is the source
3732 argument or null, and LEN is the number of bytes. Use Object Size type-0
3733 regardless of the OPT_Wstringop_overflow_ setting. Return true on success
3734 (no overflow or invalid sizes), false otherwise. */
3736 static bool
3738 {
3739 /* For functions like memset and memcpy that operate on raw memory
3740 try to determine the size of the largest source and destination
3741 object using type-0 Object Size regardless of the object size
3742 type specified by the option. */
3748 }
3750 /* Validate memchr arguments without performing any expansion.
3751 Return NULL_RTX. */
3753 static rtx
3755 {
3763 /* Diagnose calls where the specified length exceeds the size
3764 of the object. */
3766 {
3770 }
3773 }
3775 /* Expand a call EXP to the memcpy builtin.
3776 Return NULL_RTX if we failed, the caller should emit a normal call,
3777 otherwise try to get the result in TARGET, if convenient (and in
3778 mode MODE if that's convenient). */
3780 static rtx
3782 {
3795 }
3797 /* Check a call EXP to the memmove built-in for validity.
3798 Return NULL_RTX on both success and failure. */
3800 static rtx
3802 {
3815 }
3817 /* Expand a call EXP to the mempcpy builtin.
3818 Return NULL_RTX if we failed; the caller should emit a normal call,
3819 otherwise try to get the result in TARGET, if convenient (and in
3820 mode MODE if that's convenient). */
3822 static rtx
3824 {
3833 /* Policy does not generally allow using compute_objsize (which
3834 is used internally by check_memop_size) to change code generation
3835 or drive optimization decisions.
3837 In this instance it is safe because the code we generate has
3838 the same semantics regardless of the return value of
3839 check_memop_sizes. Exactly the same amount of data is copied
3840 and the return value is exactly the same in both cases.
3842 Furthermore, check_memop_size always uses mode 0 for the call to
3843 compute_objsize, so the imprecise nature of compute_objsize is
3844 avoided. */
3846 /* Avoid expanding mempcpy into memcpy when the call is determined
3847 to overflow the buffer. This also prevents the same overflow
3848 from being diagnosed again when expanding memcpy. */
3854 }
3856 /* Helper function to do the actual work for expand of memory copy family
3857 functions (memcpy, mempcpy, stpcpy). Expansing should assign LEN bytes
3858 of memory from SRC to DEST and assign to TARGET if convenient. Return
3859 value is based on RETMODE argument. */
3861 static rtx
3865 {
3878 /* If DEST is not a pointer type, call the normal function. */
3882 /* If either SRC is not a pointer type, don't do this
3883 operation in-line. */
3900 /* If SRC is a string constant and block move would be done by
3901 pieces, we can avoid loading the string from memory and only
3902 stored the computed constants. This works in the overlap
3903 (memmove) case as well because store_by_pieces just generates a
3904 series of stores of constants from the string constant returned
3905 by c_getstr(). */
3912 {
3914 builtin_memcpy_read_str,
3920 }
3925 /* Copy word part most expediently. */
3932 && !might_overlap
3941 /* Bail out when a mempcpy call would be expanded as libcall and when
3942 we have a target that provides a fast implementation
3943 of mempcpy routine. */
3951 {
3954 }
3957 {
3959 /* stpcpy pointer to last byte. */
3962 }
3965 }
3967 static rtx
3970 {
3973 }
3975 /* Expand into a movstr instruction, if one is available. Return NULL_RTX if
3976 we failed, the caller should emit a normal call, otherwise try to
3977 get the result in TARGET, if convenient.
3978 Return value is based on RETMODE argument. */
3980 static rtx
3982 {
3984 rtx dest_mem;
3985 rtx src_mem;
3993 {
3996 }
4006 {
4008 /* movstr is supposed to set end to the address of the NUL
4009 terminator. If the caller requested a mempcpy-like return value,
4010 adjust it. */
4012 {
4016 }
4017 }
4019 }
4021 /* Do some very basic size validation of a call to the strcpy builtin
4022 given by EXP. Return NULL_RTX to have the built-in expand to a call
4023 to the library function. */
4025 static rtx
4027 {
4035 /* There is no way here to determine the length of the string in
4036 the destination to which the SRC string is being appended so
4037 just diagnose cases when the souce string is longer than
4038 the destination object. */
4043 destsize);
4046 }
4048 /* Expand expression EXP, which is a call to the strcpy builtin. Return
4049 NULL_RTX if we failed the caller should emit a normal call, otherwise
4050 try to get the result in TARGET, if convenient (and in mode MODE if that's
4051 convenient). */
4053 static rtx
4055 {
4063 {
4067 }
4070 {
4071 /* Check to see if the argument was declared attribute nonstring
4072 and if so, issue a warning since at this point it's not known
4073 to be nul-terminated. */
4077 }
4080 }
4082 /* Helper function to do the actual work for expand_builtin_strcpy. The
4083 arguments to the builtin_strcpy call DEST and SRC are broken out
4084 so that this can also be called without constructing an actual CALL_EXPR.
4085 The other arguments and return value are the same as for
4086 expand_builtin_strcpy. */
4088 static rtx
4090 {
4091 /* Detect strcpy calls with unterminated arrays.. */
4093 {
4094 /* NONSTR refers to the non-nul terminated constant array. */
4098 }
4101 }
4103 /* Expand a call EXP to the stpcpy builtin.
4104 Return NULL_RTX if we failed the caller should emit a normal call,
4105 otherwise try to get the result in TARGET, if convenient (and in
4106 mode MODE if that's convenient). */
4108 static rtx
4110 {
4121 {
4125 }
4127 /* If return value is ignored, transform stpcpy into strcpy. */
4129 {
4133 }
4134 else
4135 {
4137 rtx ret;
4139 /* Ensure we get an actual string whose length can be evaluated at
4140 compile-time, not an expression containing a string. This is
4141 because the latter will potentially produce pessimized code
4142 when used to produce the return value. */
4143 c_strlen_data lendata = { };
4161 {
4165 {
4169 {
4171 {
4174 else
4176 }
4185 }
4186 }
4187 }
4191 }
4192 }
4194 /* Expand a call EXP to the stpcpy builtin and diagnose uses of nonstring
4195 arguments while being careful to avoid duplicate warnings (which could
4196 be issued if the expander were to expand the call, resulting in it
4197 being emitted in expand_call(). */
4199 static rtx
4201 {
4203 {
4204 /* The call has been successfully expanded. Check for nonstring
4205 arguments and issue warnings as appropriate. */
4208 }
4211 }
4213 /* Check a call EXP to the stpncpy built-in for validity.
4214 Return NULL_RTX on both success and failure. */
4216 static rtx
4218 {
4224 /* The source and destination of the call. */
4228 /* The exact number of bytes to write (not the maximum). */
4231 /* The size of the destination object. */
4237 }
4239 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
4240 bytes from constant string DATA + OFFSET and return it as target
4241 constant. */
4243 rtx
4245 scalar_int_mode mode)
4246 {
4253 }
4255 /* Helper to check the sizes of sequences and the destination of calls
4256 to __builtin_strncat and __builtin___strncat_chk. Returns true on
4257 success (no overflow or invalid sizes), false otherwise. */
4259 static bool
4261 {
4266 /* Try to determine the range of lengths that the source expression
4267 refers to. */
4268 c_strlen_data lendata = { };
4271 /* Try to verify that the destination is big enough for the shortest
4272 string. */
4275 {
4276 /* If it hasn't been provided by __strncat_chk, try to determine
4277 the size of the destination object into which the source is
4278 being copied. */
4280 }
4282 /* Add one for the terminating nul. */
4285 size_one_node)
4288 /* The strncat function copies at most MAXREAD bytes and always appends
4289 the terminating nul so the specified upper bound should never be equal
4290 to (or greater than) the size of the destination. */
4293 {
4302 }
4310 /* The number of bytes to write is LEN but check_access will also
4311 check SRCLEN if LEN's value isn't known. */
4313 objsize);
4314 }
4316 /* Similar to expand_builtin_strcat, do some very basic size validation
4317 of a call to the strcpy builtin given by EXP. Return NULL_RTX to have
4318 the built-in expand to a call to the library function. */
4320 static rtx
4322 {
4330 /* The upper bound on the number of bytes to write. */
4332 /* The length of the source sequence. */
4335 /* Try to determine the range of lengths that the source expression
4336 refers to. Since the lengths are only used for warning and not
4337 for code generation disable strict mode below. */
4340 {
4341 c_strlen_data lendata = { };
4344 }
4346 /* Try to verify that the destination is big enough for the shortest
4347 string. First try to determine the size of the destination object
4348 into which the source is being copied. */
4351 /* Add one for the terminating nul. */
4352 tree srclen = (maxlen
4354 size_one_node)
4357 /* The strncat function copies at most MAXREAD bytes and always appends
4358 the terminating nul so the specified upper bound should never be equal
4359 to (or greater than) the size of the destination. */
4362 {
4371 }
4379 /* The number of bytes to write is SRCLEN. */
4383 }
4385 /* Expand expression EXP, which is a call to the strncpy builtin. Return
4386 NULL_RTX if we failed the caller should emit a normal call. */
4388 static rtx
4390 {
4395 {
4398 /* The number of bytes to write (not the maximum). */
4400 /* The length of the source sequence. */
4404 {
4408 /* The number of bytes to write is LEN but check_access will also
4409 check SLEN if LEN's value isn't known. */
4411 destsize);
4412 }
4414 /* We must be passed a constant len and src parameter. */
4420 /* We're required to pad with trailing zeros if the requested
4421 len is greater than strlen(s2)+1. In that case try to
4422 use store_by_pieces, if it fails, punt. */
4424 {
4427 rtx dest_mem;
4431 builtin_strncpy_read_str,
4438 builtin_strncpy_read_str,
4440 RETURN_BEGIN);
4444 }
4445 }
4447 }
4449 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
4450 bytes from constant string DATA + OFFSET and return it as target
4451 constant. */
4453 rtx
4455 scalar_int_mode mode)
4456 {
4463 }
4465 /* Callback routine for store_by_pieces. Return the RTL of a register
4466 containing GET_MODE_SIZE (MODE) consecutive copies of the unsigned
4467 char value given in the RTL register data. For example, if mode is
4468 4 bytes wide, return the RTL for 0x01010101*data. */
4470 static rtx
4472 scalar_int_mode mode)
4473 {
4489 }
4491 /* Expand expression EXP, which is a call to the memset builtin. Return
4492 NULL_RTX if we failed the caller should emit a normal call, otherwise
4493 try to get the result in TARGET, if convenient (and in mode MODE if that's
4494 convenient). */
4496 static rtx
4498 {
4510 }
4512 /* Helper function to do the actual work for expand_builtin_memset. The
4513 arguments to the builtin_memset call DEST, VAL, and LEN are broken out
4514 so that this can also be called without constructing an actual CALL_EXPR.
4515 The other arguments and return value are the same as for
4516 expand_builtin_memset. */
4518 static rtx
4521 {
4524 machine_mode val_mode;
4536 /* If DEST is not a pointer type, don't do this operation in-line. */
4547 /* If the LEN parameter is zero, return DEST. */
4549 {
4550 /* Evaluate and ignore VAL in case it has side-effects. */
4553 }
4555 /* Stabilize the arguments in case we fail. */
4567 {
4568 rtx val_rtx;
4573 /* Assume that we can memset by pieces if we can store
4574 * the coefficients by pieces (in the required modes).
4575 * We can't pass builtin_memset_gen_str as that emits RTL. */
4581 {
4586 }
4590 probable_max_size))
4596 }
4602 {
4609 RETURN_BEGIN);
4614 probable_max_size))
4620 }
4628 probable_max_size);
4631 {
4634 }
4638 do_libcall:
4647 else
4652 }
4654 /* Expand expression EXP, which is a call to the bzero builtin. Return
4655 NULL_RTX if we failed the caller should emit a normal call. */
4657 static rtx
4659 {
4668 /* New argument list transforming bzero(ptr x, int y) to
4669 memset(ptr x, int 0, size_t y). This is done this way
4670 so that if it isn't expanded inline, we fallback to
4671 calling bzero instead of memset. */
4679 }
4681 /* Try to expand cmpstr operation ICODE with the given operands.
4682 Return the result rtx on success, otherwise return null. */
4684 static rtx
4686 HOST_WIDE_INT align)
4687 {
4701 }
4703 /* Expand expression EXP, which is a call to the memcmp built-in function.
4704 Return NULL_RTX if we failed and the caller should emit a normal call,
4705 otherwise try to get the result in TARGET, if convenient.
4706 RESULT_EQ is true if we can relax the returned value to be either zero
4707 or nonzero, without caring about the sign. */
4709 static rtx
4711 {
4722 /* Diagnose calls where the specified length exceeds the size of either
4723 object. */
4729 {
4734 }
4736 /* If the specified length exceeds the size of either object,
4737 call the function. */
4741 /* Due to the performance benefit, always inline the calls first
4742 when result_eq is false. */
4746 {
4750 }
4758 /* If we don't have POINTER_TYPE, call the function. */
4766 /* Set MEM_SIZE as appropriate. */
4768 {
4771 }
4777 {
4781 }
4783 /* If SRC is a string constant and block move would be done
4784 by pieces, we can avoid loading the string from memory
4785 and only stored the computed constants. */
4797 {
4798 /* Return the value in the proper mode for this function. */
4803 {
4806 }
4809 }
4812 }
4814 /* Expand expression EXP, which is a call to the strcmp builtin. Return NULL_RTX
4815 if we failed the caller should emit a normal call, otherwise try to get
4816 the result in TARGET, if convenient. */
4818 static rtx
4820 {
4824 /* Due to the performance benefit, always inline the calls first. */
4841 /* If we don't have POINTER_TYPE, call the function. */
4845 /* Stabilize the arguments in case gen_cmpstr(n)si fail. */
4852 /* Try to call cmpstrsi. */
4857 /* Try to determine at least one length and call cmpstrnsi. */
4859 {
4860 tree len;
4861 rtx arg3_rtx;
4871 /* If we don't have a constant length for the first, use the length
4872 of the second, if we know it. We don't require a constant for
4873 this case; some cost analysis could be done if both are available
4874 but neither is constant. For now, assume they're equally cheap,
4875 unless one has side effects. If both strings have constant lengths,
4876 use the smaller. */
4892 else
4895 /* If both arguments have side effects, we cannot optimize. */
4897 {
4899 result = expand_cmpstrn_or_cmpmem
4902 }
4903 }
4907 {
4908 /* Check to see if the argument was declared attribute nonstring
4909 and if so, issue a warning since at this point it's not known
4910 to be nul-terminated. */
4913 /* Return the value in the proper mode for this function. */
4921 }
4923 /* Expand the library call ourselves using a stabilized argument
4924 list to avoid re-evaluating the function's arguments twice. */
4929 }
4931 /* Expand expression EXP, which is a call to the strncmp builtin. Return
4932 NULL_RTX if we failed the caller should emit a normal call, otherwise try to get
4933 the result in TARGET, if convenient. */
4935 static rtx
4937 ATTRIBUTE_UNUSED machine_mode mode)
4938 {
4943 /* Due to the performance benefit, always inline the calls first. */
4949 /* If c_strlen can determine an expression for one of the string
4950 lengths, and it doesn't have side effects, then emit cmpstrnsi
4951 using length MIN(strlen(string)+1, arg3). */
4956 tree len;
4977 /* If we don't have a constant length for the first, use the length
4978 of the second, if we know it. If neither string is constant length,
4979 use the given length argument. We don't require a constant for
4980 this case; some cost analysis could be done if both are available
4981 but neither is constant. For now, assume they're equally cheap,
4982 unless one has side effects. If both strings have constant lengths,
4983 use the smaller. */
5001 else
5004 /* If we are not using the given length, we must incorporate it here.
5005 The actual new length parameter will be MIN(len,arg3) in this case. */
5007 {
5010 }
5020 {
5021 /* Check to see if the argument was declared attribute nonstring
5022 and if so, issue a warning since at this point it's not known
5023 to be nul-terminated. */
5026 /* Return the value in the proper mode for this function. */
5034 }
5036 /* Expand the library call ourselves using a stabilized argument
5037 list to avoid re-evaluating the function's arguments twice. */
5042 }
5044 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
5045 if that's convenient. */
5047 rtx
5049 {
5050 rtx val;
5053 /* Don't do __builtin_saveregs more than once in a function.
5054 Save the result of the first call and reuse it. */
5058 /* When this function is called, it means that registers must be
5059 saved on entry to this function. So we migrate the call to the
5060 first insn of this function. */
5064 /* Do whatever the machine needs done in this case. */
5072 /* Put the insns after the NOTE that starts the function. If this
5073 is inside a start_sequence, make the outer-level insn chain current, so
5074 the code is placed at the start of the function. */
5080 }
5082 /* Expand a call to __builtin_next_arg. */
5084 static rtx
5086 {
5087 /* Checking arguments is already done in fold_builtin_next_arg
5088 that must be called before this function. */
5093 }
5095 /* Make it easier for the backends by protecting the valist argument
5096 from multiple evaluations. */
5098 static tree
5100 {
5103 /* The current way of determining the type of valist is completely
5104 bogus. We should have the information on the va builtin instead. */
5109 {
5113 /* For this case, the backends will be expecting a pointer to
5114 vatype, but it's possible we've actually been given an array
5115 (an actual TARGET_CANONICAL_VA_LIST_TYPE (valist)).
5116 So fix it. */
5118 {
5121 }
5122 }
5123 else
5124 {
5128 {
5134 }
5140 }
5143 }
5145 /* The "standard" definition of va_list is void*. */
5147 tree
5149 {
5151 }
5153 /* The "standard" abi va_list is va_list_type_node. */
5155 tree
5157 {
5159 }
5161 /* The "standard" type of va_list is va_list_type_node. */
5163 tree
5165 {
5172 {
5173 /* If va_list is an array type, the argument may have decayed
5174 to a pointer type, e.g. by being passed to another function.
5175 In that case, unwrap both types so that we can compare the
5176 underlying records. */
5179 {
5182 }
5183 }
5188 }
5190 /* The "standard" implementation of va_start: just assign `nextarg' to
5191 the variable. */
5193 void
5195 {
5198 }
5200 /* Expand EXP, a call to __builtin_va_start. */
5202 static rtx
5204 {
5205 rtx nextarg;
5206 tree valist;
5210 {
5213 }
5223 else
5227 }
5229 /* Expand EXP, a call to __builtin_va_end. */
5231 static rtx
5233 {
5236 /* Evaluate for side effects, if needed. I hate macros that don't
5237 do that. */
5242 }
5244 /* Expand EXP, a call to __builtin_va_copy. We do this as a
5245 builtin rather than just as an assignment in stdarg.h because of the
5246 nastiness of array-type va_list types. */
5248 static rtx
5250 {
5263 {
5267 }
5268 else
5269 {
5272 /* Evaluate to pointers. */
5281 /* "Dereference" to BLKmode memories. */
5289 /* Copy. */
5291 }
5294 }
5296 /* Expand a call to one of the builtin functions __builtin_frame_address or
5297 __builtin_return_address. */
5299 static rtx
5301 {
5302 /* The argument must be a nonnegative integer constant.
5303 It counts the number of frames to scan up the stack.
5304 The value is either the frame pointer value or the return
5305 address saved in that frame. */
5307 /* Warning about missing arg was already issued. */
5310 {
5313 }
5314 else
5315 {
5316 /* Number of frames to scan up the stack. */
5321 /* Some ports cannot access arbitrary stack frames. */
5323 {
5326 }
5329 {
5330 /* Warn since no effort is made to ensure that any frame
5331 beyond the current one exists or can be safely reached. */
5334 }
5336 /* For __builtin_frame_address, return what we've got. */
5344 }
5345 }
5347 /* Expand EXP, a call to the alloca builtin. Return NULL_RTX if we
5348 failed and the caller should emit a normal call. */
5350 static rtx
5352 {
5353 rtx op0;
5354 rtx result;
5357 HOST_WIDE_INT max_size;
5360 bool valid_arglist
5363 VOID_TYPE)
5374 || (!alloca_for_var
5377 ))
5378 {
5379 /* -Walloca-larger-than and -Wvla-larger-than settings of
5380 less than HOST_WIDE_INT_MAX override the more general
5381 -Walloc-size-larger-than so unless either of the former
5382 options is smaller than the last one (wchich would imply
5383 that the call was already checked), check the alloca
5384 arguments for overflow. */
5388 }
5390 /* Compute the argument. */
5393 /* Compute the alignment. */
5395 ? BIGGEST_ALIGNMENT
5398 /* Compute the maximum size. */
5403 /* Allocate the desired space. If the allocation stems from the declaration
5404 of a variable-sized object, it cannot accumulate. */
5405 result
5410 }
5412 /* Emit a call to __asan_allocas_unpoison call in EXP. Add to second argument
5413 of the call virtual_stack_dynamic_rtx - stack_pointer_rtx, which is the
5414 STACK_DYNAMIC_OFFSET value. See motivation for this in comment to
5415 handle_builtin_stack_restore function. */
5417 static rtx
5419 {
5426 OPTAB_LIB_WIDEN);
5429 OPTAB_LIB_WIDEN);
5434 }
5436 /* Expand a call to bswap builtin in EXP.
5437 Return NULL_RTX if a normal call should be emitted rather than expanding the
5438 function in-line. If convenient, the result should be placed in TARGET.
5439 SUBTARGET may be used as the target for computing one of EXP's operands. */
5441 static rtx
5443 rtx subtarget)
5444 {
5445 tree arg;
5446 rtx op0;
5464 }
5466 /* Expand a call to a unary builtin in EXP.
5467 Return NULL_RTX if a normal call should be emitted rather than expanding the
5468 function in-line. If convenient, the result should be placed in TARGET.
5469 SUBTARGET may be used as the target for computing one of EXP's operands. */
5471 static rtx
5474 {
5475 rtx op0;
5480 /* Compute the argument. */
5482 (subtarget
5486 /* Compute op, into TARGET if possible.
5487 Set TARGET to wherever the result comes back. */
5493 }
5495 /* Expand a call to __builtin_expect. We just return our argument
5496 as the builtin_expect semantic should've been already executed by
5497 tree branch prediction pass. */
5499 static rtx
5501 {
5502 tree arg;
5509 /* When guessing was done, the hints should be already stripped away. */
5513 }
5515 /* Expand a call to __builtin_expect_with_probability. We just return our
5516 argument as the builtin_expect semantic should've been already executed by
5517 tree branch prediction pass. */
5519 static rtx
5521 {
5522 tree arg;
5529 /* When guessing was done, the hints should be already stripped away. */
5533 }
5536 /* Expand a call to __builtin_assume_aligned. We just return our first
5537 argument as the builtin_assume_aligned semantic should've been already
5538 executed by CCP. */
5540 static rtx
5542 {
5546 EXPAND_NORMAL);
5551 }
5553 void
5555 {
5557 {
5559 /* For trap insns when not accumulating outgoing args force
5560 REG_ARGS_SIZE note to prevent crossjumping of calls with
5561 different args sizes. */
5564 }
5565 else
5566 {
5570 }
5573 }
5575 /* Expand a call to __builtin_unreachable. We do nothing except emit
5576 a barrier saying that control flow will not pass here.
5578 It is the responsibility of the program being compiled to ensure
5579 that control flow does never reach __builtin_unreachable. */
5580 static void
5582 {
5584 }
5586 /* Expand EXP, a call to fabs, fabsf or fabsl.
5587 Return NULL_RTX if a normal call should be emitted rather than expanding
5588 the function inline. If convenient, the result should be placed
5589 in TARGET. SUBTARGET may be used as the target for computing
5590 the operand. */
5592 static rtx
5594 {
5595 machine_mode mode;
5596 tree arg;
5597 rtx op0;
5607 }
5609 /* Expand EXP, a call to copysign, copysignf, or copysignl.
5610 Return NULL is a normal call should be emitted rather than expanding the
5611 function inline. If convenient, the result should be placed in TARGET.
5612 SUBTARGET may be used as the target for computing the operand. */
5614 static rtx
5616 {
5618 tree arg;
5630 }
5632 /* Expand a call to __builtin___clear_cache. */
5634 static rtx
5636 {
5638 {
5639 #ifdef CLEAR_INSN_CACHE
5640 /* There is no "clear_cache" insn, and __clear_cache() in libgcc
5641 does something. Just do the default expansion to a call to
5642 __clear_cache(). */
5644 #else
5645 /* There is no "clear_cache" insn, and __clear_cache() in libgcc
5646 does nothing. There is no need to call it. Do nothing. */
5649 }
5651 /* We have a "clear_cache" insn, and it will handle everything. */
5655 /* We must not expand to a library call. If we did, any
5656 fallback library function in libgcc that might contain a call to
5657 __builtin___clear_cache() would recurse infinitely. */
5659 {
5662 }
5665 {
5678 }
5680 }
5682 /* Given a trampoline address, make sure it satisfies TRAMPOLINE_ALIGNMENT. */
5684 static rtx
5686 {
5689 /* If we don't need too much alignment, we'll have been guaranteed
5690 proper alignment by get_trampoline_type. */
5694 /* Round address up to desired boundary. */
5705 }
5707 static rtx
5709 {
5725 /* If ONSTACK, the TRAMP argument should be the address of a field
5726 within the local function's FRAME decl. Either way, let's see if
5727 we can fill in the MEM_ATTRs for this memory. */
5731 /* Creator of a heap trampoline is responsible for making sure the
5732 address is aligned to at least STACK_BOUNDARY. Normally malloc
5733 will ensure this anyhow. */
5736 {
5740 }
5742 /* The FUNC argument should be the address of the nested function.
5743 Extract the actual function decl to pass to the hook. */
5750 /* Generate insns to initialize the trampoline. */
5754 {
5760 }
5763 }
5765 static rtx
5767 {
5768 rtx tramp;
5779 }
5781 /* Expand a call to the builtin descriptor initialization routine.
5782 A descriptor is made up of a couple of pointers to the static
5783 chain and the code entry in this order. */
5785 static rtx
5787 {
5792 VOID_TYPE))
5807 /* Generate insns to initialize the descriptor. */
5813 }
5815 /* Expand a call to the builtin descriptor adjustment routine. */
5817 static rtx
5819 {
5820 rtx tramp;
5827 /* Unalign the descriptor to allow runtime identification. */
5832 }
5834 /* Expand the call EXP to the built-in signbit, signbitf or signbitl
5835 function. The function first checks whether the back end provides
5836 an insn to implement signbit for the respective mode. If not, it
5837 checks whether the floating point format of the value is such that
5838 the sign bit can be extracted. If that is not the case, error out.
5839 EXP is the expression that is a call to the builtin function; if
5840 convenient, the result should be placed in TARGET. */
5841 static rtx
5843 {
5845 scalar_float_mode fmode;
5847 tree arg;
5850 rtx temp;
5863 /* Expand the argument yielding a RTX expression. */
5866 /* Check if the back end provides an insn that handles signbit for the
5867 argument's mode. */
5870 {
5876 }
5878 /* For floating point formats without a sign bit, implement signbit
5879 as "ARG < 0.0". */
5882 {
5883 /* But we can't do this if the format supports signed zero. */
5889 }
5892 {
5895 }
5896 else
5897 {
5899 /* Handle targets with different FP word orders. */
5902 else
5906 }
5908 /* Force the intermediate word_mode (or narrower) result into a
5909 register. This avoids attempting to create paradoxical SUBREGs
5910 of floating point modes below. */
5913 /* If the bitpos is within the "result mode" lowpart, the operation
5914 can be implement with a single bitwise AND. Otherwise, we need
5915 a right shift and an AND. */
5918 {
5926 }
5927 else
5928 {
5929 /* Perform a logical right shift to place the signbit in the least
5930 significant bit, then truncate the result to the desired mode
5931 and mask just this bit. */
5936 }
5939 }
5941 /* Expand fork or exec calls. TARGET is the desired target of the
5942 call. EXP is the call. FN is the
5943 identificator of the actual function. IGNORE is nonzero if the
5944 value is to be ignored. */
5946 static rtx
5948 {
5950 tree call;
5952 /* If we are not profiling, just call the function. */
5956 /* Otherwise call the wrapper. This should be equivalent for the rest of
5957 compiler, so the code does not diverge, and the wrapper may run the
5958 code necessary for keeping the profiling sane. */
5961 {
5992 }
6004 }
6007 \f
6008 /* Reconstitute a mode for a __sync intrinsic operation. Since the type of
6009 the pointer in these functions is void*, the tree optimizers may remove
6010 casts. The mode computed in expand_builtin isn't reliable either, due
6011 to __sync_bool_compare_and_swap.
6013 FCODE_DIFF should be fcode - base, where base is the FOO_1 code for the
6014 group of builtins. This gives us log2 of the mode size. */
6018 {
6019 /* The size is not negotiable, so ask not to get BLKmode in return
6020 if the target indicates that a smaller size would be better. */
6022 }
6024 /* Expand the memory expression LOC and return the appropriate memory operand
6025 for the builtin_sync operations. */
6027 static rtx
6029 {
6039 /* Note that we explicitly do not want any alias information for this
6040 memory, so that we kill all other live memories. Otherwise we don't
6041 satisfy the full barrier semantics of the intrinsic. */
6048 /* The alignment needs to be at least according to that of the mode. */
6055 }
6057 /* Make sure an argument is in the right mode.
6058 EXP is the tree argument.
6059 MODE is the mode it should be in. */
6061 static rtx
6063 {
6064 rtx val;
6065 machine_mode old_mode;
6068 /* If VAL is promoted to a wider mode, convert it back to MODE. Take care
6069 of CONST_INTs, where we know the old_mode only from the call argument. */
6076 }
6079 /* Expand the __sync_xxx_and_fetch and __sync_fetch_and_xxx intrinsics.
6080 EXP is the CALL_EXPR. CODE is the rtx code
6081 that corresponds to the arithmetic or logical operation from the name;
6082 an exception here is that NOT actually means NAND. TARGET is an optional
6083 place for us to store the results; AFTER is true if this is the
6084 fetch_and_xxx form. */
6086 static rtx
6089 rtx target)
6090 {
6095 {
6102 {
6131 }
6132 }
6134 /* Expand the operands. */
6139 after);
6140 }
6142 /* Expand the __sync_val_compare_and_swap and __sync_bool_compare_and_swap
6143 intrinsics. EXP is the CALL_EXPR. IS_BOOL is
6144 true if this is the boolean form. TARGET is a place for us to store the
6145 results; this is NOT optional if IS_BOOL is true. */
6147 static rtx
6150 {
6154 /* Expand the operands. */
6161 {
6164 else
6166 }
6169 MEMMODEL_SYNC_SEQ_CST))
6173 }
6175 /* Expand the __sync_lock_test_and_set intrinsic. Note that the most
6176 general form is actually an atomic exchange, and some targets only
6177 support a reduced form with the second argument being a constant 1.
6178 EXP is the CALL_EXPR; TARGET is an optional place for us to store
6179 the results. */
6181 static rtx
6183 rtx target)
6184 {
6187 /* Expand the operands. */
6192 }
6194 /* Expand the __sync_lock_release intrinsic. EXP is the CALL_EXPR. */
6196 static void
6198 {
6199 rtx mem;
6201 /* Expand the operands. */
6205 }
6207 /* Given an integer representing an ``enum memmodel'', verify its
6208 correctness and return the memory model enum. */
6210 static enum memmodel
6212 {
6213 rtx op;
6215 location_t loc
6218 /* If the parameter is not a constant, it's a run time value so we'll just
6219 convert it to MEMMODEL_SEQ_CST to avoid annoying runtime checking. */
6229 {
6233 }
6235 /* Should never see a user explicit SYNC memodel model, so >= LAST works. */
6237 {
6241 }
6243 /* Workaround for Bugzilla 59448. GCC doesn't track consume properly, so
6244 be conservative and promote consume to acquire. */
6249 }
6251 /* Expand the __atomic_exchange intrinsic:
6252 TYPE __atomic_exchange (TYPE *object, TYPE desired, enum memmodel)
6253 EXP is the CALL_EXPR.
6254 TARGET is an optional place for us to store the results. */
6256 static rtx
6258 {
6267 /* Expand the operands. */
6272 }
6274 /* Expand the __atomic_compare_exchange intrinsic:
6275 bool __atomic_compare_exchange (TYPE *object, TYPE *expect,
6276 TYPE desired, BOOL weak,
6277 enum memmodel success,
6278 enum memmodel failure)
6279 EXP is the CALL_EXPR.
6280 TARGET is an optional place for us to store the results. */
6282 static rtx
6284 rtx target)
6285 {
6289 tree weak;
6291 location_t loc
6298 {
6300 "failure memory model cannot be stronger than success "
6303 }
6306 {
6308 "invalid failure memory model for "
6312 }
6318 /* Expand the operands. */
6334 /* Lest the rtl backend create a race condition with an imporoper store
6335 to memory, always create a new pseudo for OLDVAL. */
6342 /* Conditionally store back to EXPECT, lest we create a race condition
6343 with an improper store to memory. */
6344 /* ??? With a rearrangement of atomics at the gimple level, we can handle
6345 the normal case where EXPECT is totally private, i.e. a register. At
6346 which point the store can be unconditional. */
6354 }
6356 /* Helper function for expand_ifn_atomic_compare_exchange - expand
6357 internal ATOMIC_COMPARE_EXCHANGE call into __atomic_compare_exchange_N
6358 call. The weak parameter must be dropped to match the expected parameter
6359 list and the expected argument changed from value to pointer to memory
6360 slot. */
6362 static void
6364 {
6380 /* Skip the boolean weak parameter. */
6383 /* At present we only have BUILT_IN_ATOMIC_COMPARE_EXCHANGE_{1,2,4,8,16}. */
6386 built_in_function fncode
6391 fndecl);
6396 {
6403 }
6404 }
6406 /* Expand IFN_ATOMIC_COMPARE_EXCHANGE internal function. */
6408 void
6410 {
6416 tree lhs;
6418 location_t loc
6425 {
6427 "failure memory model cannot be stronger than success "
6430 }
6433 {
6435 "invalid failure memory model for "
6439 }
6442 {
6445 }
6447 /* Expand the operands. */
6460 {
6463 }
6467 {
6473 }
6474 }
6476 /* Expand the __atomic_load intrinsic:
6477 TYPE __atomic_load (TYPE *object, enum memmodel)
6478 EXP is the CALL_EXPR.
6479 TARGET is an optional place for us to store the results. */
6481 static rtx
6483 {
6484 rtx mem;
6489 {
6490 location_t loc
6495 }
6500 /* Expand the operand. */
6504 }
6507 /* Expand the __atomic_store intrinsic:
6508 void __atomic_store (TYPE *object, TYPE desired, enum memmodel)
6509 EXP is the CALL_EXPR.
6510 TARGET is an optional place for us to store the results. */
6512 static rtx
6514 {
6521 {
6522 location_t loc
6527 }
6532 /* Expand the operands. */
6537 }
6539 /* Expand the __atomic_fetch_XXX intrinsic:
6540 TYPE __atomic_fetch_XXX (TYPE *object, TYPE val, enum memmodel)
6541 EXP is the CALL_EXPR.
6542 TARGET is an optional place for us to store the results.
6543 CODE is the operation, PLUS, MINUS, ADD, XOR, or IOR.
6544 FETCH_AFTER is true if returning the result of the operation.
6545 FETCH_AFTER is false if returning the value before the operation.
6546 IGNORE is true if the result is not used.
6547 EXT_CALL is the correct builtin for an external call if this cannot be
6548 resolved to an instruction sequence. */
6550 static rtx
6554 {
6557 tree fndecl;
6558 tree addr;
6562 /* Expand the operands. */
6566 /* Only try generating instructions if inlining is turned on. */
6568 {
6572 }
6574 /* Return if a different routine isn't needed for the library call. */
6578 /* Change the call to the specified function. */
6586 /* If we will emit code after the call, the call cannot be a tail call.
6587 If it is emitted as a tail call, a barrier is emitted after it, and
6588 then all trailing code is removed. */
6592 /* Expand the call here so we can emit trailing code. */
6595 /* Replace the original function just in case it matters. */
6598 /* Then issue the arithmetic correction to return the right result. */
6600 {
6602 {
6604 OPTAB_LIB_WIDEN);
6606 }
6607 else
6609 OPTAB_LIB_WIDEN);
6610 }
6612 }
6614 /* Expand IFN_ATOMIC_BIT_TEST_AND_* internal function. */
6616 void
6618 {
6626 optab optab;
6638 {
6653 }
6656 {
6663 }
6685 {
6690 }
6691 else
6693 OPTAB_DIRECT);
6696 }
6698 /* Expand an atomic clear operation.
6699 void _atomic_clear (BOOL *obj, enum memmodel)
6700 EXP is the call expression. */
6702 static rtx
6704 {
6705 machine_mode mode;
6714 {
6715 location_t loc
6720 }
6722 /* Try issuing an __atomic_store, and allow fallback to __sync_lock_release.
6723 Failing that, a store is issued by __atomic_store. The only way this can
6724 fail is if the bool type is larger than a word size. Unlikely, but
6725 handle it anyway for completeness. Assume a single threaded model since
6726 there is no atomic support in this case, and no barriers are required. */
6731 }
6733 /* Expand an atomic test_and_set operation.
6734 bool _atomic_test_and_set (BOOL *obj, enum memmodel)
6735 EXP is the call expression. */
6737 static rtx
6739 {
6740 rtx mem;
6742 machine_mode mode;
6749 }
6752 /* Return true if (optional) argument ARG1 of size ARG0 is always lock free on
6753 this architecture. If ARG1 is NULL, use typical alignment for size ARG0. */
6755 static tree
6757 {
6759 machine_mode mode;
6765 /* We need a corresponding integer mode for the access to be lock-free. */
6773 {
6776 /* Either this argument is null, or it's a fake pointer encoding
6777 the alignment of the object. */
6783 else
6785 }
6786 else
6787 {
6790 /* This function is usually invoked and folded immediately by the front
6791 end before anything else has a chance to look at it. The pointer
6792 parameter at this point is usually cast to a void *, so check for that
6793 and look past the cast. */
6803 /* Get the underlying type of the object. */
6806 }
6808 /* If the object has smaller alignment, the lock free routines cannot
6809 be used. */
6813 /* Check if a compare_and_swap pattern exists for the mode which represents
6814 the required size. The pattern is not allowed to fail, so the existence
6815 of the pattern indicates support is present. Also require that an
6816 atomic load exists for the required size. */
6819 else
6821 }
6823 /* Return true if the parameters to call EXP represent an object which will
6824 always generate lock free instructions. The first argument represents the
6825 size of the object, and the second parameter is a pointer to the object
6826 itself. If NULL is passed for the object, then the result is based on
6827 typical alignment for an object of the specified size. Otherwise return
6828 false. */
6830 static rtx
6832 {
6833 tree size;
6838 {
6841 }
6847 }
6849 /* Return a one or zero if it can be determined that object ARG1 of size ARG
6850 is lock free on this architecture. */
6852 static tree
6854 {
6858 /* If it isn't always lock free, don't generate a result. */
6863 }
6865 /* Return true if the parameters to call EXP represent an object which will
6866 always generate lock free instructions. The first argument represents the
6867 size of the object, and the second parameter is a pointer to the object
6868 itself. If NULL is passed for the object, then the result is based on
6869 typical alignment for an object of the specified size. Otherwise return
6870 NULL*/
6872 static rtx
6874 {
6875 tree size;
6880 {
6883 }
6888 /* If the value is known at compile time, return the RTX for it. */
6894 }
6896 /* Expand the __atomic_thread_fence intrinsic:
6897 void __atomic_thread_fence (enum memmodel)
6898 EXP is the CALL_EXPR. */
6900 static void
6902 {
6905 }
6907 /* Expand the __atomic_signal_fence intrinsic:
6908 void __atomic_signal_fence (enum memmodel)
6909 EXP is the CALL_EXPR. */
6911 static void
6913 {
6916 }
6918 /* Expand the __sync_synchronize intrinsic. */
6920 static void
6922 {
6924 }
6926 static rtx
6928 {
6934 {
6936 /* If the target is not sutitable then create a new target. */
6944 }
6947 }
6949 static void
6951 {
6957 {
6964 }
6966 }
6968 \f
6969 /* Emit code to restore the current value of stack. */
6971 static void
6973 {
6985 }
6987 /* Emit code to save the current value of stack. */
6989 static rtx
6991 {
6996 }
6998 /* Emit code to get the openacc gang, worker or vector id or size. */
7000 static rtx
7002 {
7004 rtx fallback_retval;
7007 {
7020 }
7023 {
7026 }
7030 {
7033 }
7037 {
7045 }
7054 {
7057 }
7065 }
7067 /* Expand a string compare operation using a sequence of char comparison
7068 to get rid of the calling overhead, with result going to TARGET if
7069 that's convenient.
7071 VAR_STR is the variable string source;
7072 CONST_STR is the constant string source;
7073 LENGTH is the number of chars to compare;
7074 CONST_STR_N indicates which source string is the constant string;
7075 IS_MEMCMP indicates whether it's a memcmp or strcmp.
7077 to: (assume const_str_n is 2, i.e., arg2 is a constant string)
7079 target = (int) (unsigned char) var_str[0]
7080 - (int) (unsigned char) const_str[0];
7081 if (target != 0)
7082 goto ne_label;
7083 ...
7084 target = (int) (unsigned char) var_str[length - 2]
7085 - (int) (unsigned char) const_str[length - 2];
7086 if (target != 0)
7087 goto ne_label;
7088 target = (int) (unsigned char) var_str[length - 1]
7089 - (int) (unsigned char) const_str[length - 1];
7090 ne_label:
7091 */
7093 static rtx
7097 {
7099 rtx var_rtx_array
7106 scalar_int_mode unit_mode
7112 {
7113 var_rtx
7127 }
7135 }
7137 /* Inline expansion a call to str(n)cmp, with result going to
7138 TARGET if that's convenient.
7139 If the call is not been inlined, return NULL_RTX. */
7140 static rtx
7142 {
7148 /* Do NOT apply this inlining expansion when optimizing for size or
7149 optimization level below 2. */
7157 /* On a target where the type of the call (int) has same or narrower presicion
7158 than unsigned char, give up the inlining expansion. */
7174 /* If neither strings is constant string, the call is not qualify. */
7178 /* For strncmp, if the length is not a const, not qualify. */
7180 {
7183 else
7185 }
7200 else
7209 /* If the length of the comparision is larger than the threshold,
7210 do nothing. */
7217 /* Now, start inline expansion the call. */
7221 }
7223 /* Expand a call to __builtin_speculation_safe_value_<N>. MODE
7224 represents the size of the first argument to that call, or VOIDmode
7225 if the argument is a pointer. IGNORE will be true if the result
7226 isn't used. */
7227 static rtx
7230 {
7237 {
7240 }
7244 /* An optional second argument can be used as a failsafe value on
7245 some machines. If it isn't present, then the failsafe value is
7246 assumed to be 0. */
7248 {
7251 }
7252 else
7255 /* If the result isn't used, the behavior is undefined. It would be
7256 nice to emit a warning here, but path splitting means this might
7257 happen with legitimate code. So simply drop the builtin
7258 expansion in that case; we've handled any side-effects above. */
7262 /* If we don't have a suitable target, create one to hold the result. */
7270 }
7272 /* Expand an expression EXP that calls a built-in function,
7273 with result going to TARGET if that's convenient
7274 (and in mode MODE if that's convenient).
7275 SUBTARGET may be used as the target for computing one of EXP's operands.
7276 IGNORE is nonzero if the value is to be ignored. */
7278 rtx
7281 {
7289 /* When ASan is enabled, we don't want to expand some memory/string
7290 builtins and rely on libsanitizer's hooks. This allows us to avoid
7291 redundant checks and be sure, that possible overflow will be detected
7292 by ASan. */
7298 /* When not optimizing, generate calls to library functions for a certain
7299 set of builtins. */
7313 /* The built-in function expanders test for target == const0_rtx
7314 to determine whether the function's result will be ignored. */
7318 /* If the result of a pure or const built-in function is ignored, and
7319 none of its arguments are volatile, we can avoid expanding the
7320 built-in call and just evaluate the arguments for side-effects. */
7324 {
7326 tree arg;
7327 call_expr_arg_iterator iter;
7331 {
7334 }
7337 {
7341 }
7342 }
7345 {
7363 /* Just do a normal library call if we were unable to fold
7364 the values. */
7441 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
7442 FUNCTION with a copy of the parameters described by
7443 ARGUMENTS, and ARGSIZE. It returns a block of memory
7444 allocated on the stack into which is stored all the registers
7445 that might possibly be used for returning the result of a
7446 function. ARGUMENTS is the value returned by
7447 __builtin_apply_args. ARGSIZE is the number of bytes of
7448 arguments that must be copied. ??? How should this value be
7449 computed? We'll also need a safe worst case value for varargs
7450 functions. */
7457 else
7458 {
7466 }
7468 /* __builtin_return (RESULT) causes the function to return the
7469 value described by RESULT. RESULT is address of the block of
7470 memory returned by __builtin_apply. */
7480 /* All valid uses of __builtin_va_arg_pack () are removed during
7481 inlining. */
7486 /* All valid uses of __builtin_va_arg_pack_len () are removed during
7487 inlining. */
7491 /* Return the address of the first anonymous stack arg. */
7513 /* Returns the address of the area where the structure is returned.
7514 0 otherwise. */
7520 else
7523 CASE_BUILT_IN_ALLOCA:
7673 /* Expand it as BUILT_IN_MEMCMP_EQ first. If not successful, change it
7674 back to a BUILT_IN_STRCMP. Remember to delete the 3rd paramater
7675 when changing it to a strcmp call. */
7681 /* Change this call back to a BUILT_IN_STRCMP. */
7685 /* Delete the last parameter. */
7692 /* FALLTHROUGH */
7700 /* Expand it as BUILT_IN_MEMCMP_EQ first. If not successful, change it
7701 back to a BUILT_IN_STRNCMP. */
7707 /* Change it back to a BUILT_IN_STRNCMP. */
7710 /* FALLTHROUGH */
7725 {
7728 }
7732 /* This should have been lowered to the builtins below. */
7736 /* __builtin_setjmp_setup is passed a pointer to an array of five words
7737 and the receiver label. */
7739 {
7745 /* This is copied from the handling of non-local gotos. */
7747 nonlocal_goto_handler_labels
7749 nonlocal_goto_handler_labels);
7750 /* ??? Do not let expand_label treat us as such since we would
7751 not want to be both on the list of non-local labels and on
7752 the list of forced labels. */
7755 }
7759 /* __builtin_setjmp_receiver is passed the receiver label. */
7761 {
7767 }
7770 /* __builtin_longjmp is passed a pointer to an array of five words.
7771 It's similar to the C library longjmp function but works with
7772 __builtin_setjmp above. */
7775 {
7781 {
7784 }
7788 }
7797 /* This updates the setjmp buffer that is its argument with the value
7798 of the current stack pointer. */
7801 {
7802 rtx buf_addr
7807 }
7827 /* Various hooks for the DWARF 2 __throw routine. */
7833 #ifdef DWARF2_UNWIND_INFO
7839 #endif
8041 mode = get_builtin_sync_mode
8053 mode = get_builtin_sync_mode
8100 {
8104 mode =
8110 /* If this is turned into an external library call, the weak parameter
8111 must be dropped to match the expected parameter list. */
8116 /* Skip the boolean weak parameter. */
8121 }
8150 {
8160 }
8166 {
8176 }
8182 {
8192 }
8198 {
8208 }
8214 {
8224 }
8230 {
8240 }
8377 /* Do library call, if we failed to expand the builtin when
8378 folding. */
8398 }
8400 /* The switch statement above can drop through to cause the function
8401 to be called normally. */
8403 }
8405 /* Determine whether a tree node represents a call to a built-in
8406 function. If the tree T is a call to a built-in function with
8407 the right number of arguments of the appropriate types, return
8408 the DECL_FUNCTION_CODE of the call, e.g. BUILT_IN_SQRT.
8409 Otherwise the return value is END_BUILTINS. */
8411 enum built_in_function
8413 {
8416 const_call_expr_arg_iterator iter;
8428 {
8429 /* If a function doesn't take a variable number of arguments,
8430 the last element in the list will have type `void'. */
8433 {
8437 }
8446 {
8449 }
8451 {
8454 }
8456 {
8459 }
8461 {
8464 }
8465 else
8467 }
8469 /* Variable-length argument list. */
8471 }
8473 /* Fold a call to __builtin_constant_p, if we know its argument ARG will
8474 evaluate to a constant. */
8476 static tree
8478 {
8479 /* We return 1 for a numeric type that's known to be a constant
8480 value at compile-time or for an aggregate type that's a
8481 literal constant. */
8484 /* If we know this is a constant, emit the constant of one. */
8490 {
8497 }
8499 /* If this expression has side effects, show we don't know it to be a
8500 constant. Likewise if it's a pointer or aggregate type since in
8501 those case we only want literals, since those are only optimized
8502 when generating RTL, not later.
8503 And finally, if we are compiling an initializer, not code, we
8504 need to return a definite result now; there's not going to be any
8505 more optimization done. */
8510 || folding_initializer
8515 }
8517 /* Create builtin_expect or builtin_expect_with_probability
8518 with PRED and EXPECTED as its arguments and return it as a truthvalue.
8519 Fortran FE can also produce builtin_expect with PREDICTOR as third argument.
8520 builtin_expect_with_probability instead uses third argument as PROBABILITY
8521 value. */
8523 static tree
8526 {
8541 else
8543 predictor);
8547 }
8549 /* Fold a call to builtin_expect with arguments ARG0, ARG1, ARG2, ARG3. Return
8550 NULL_TREE if no simplification is possible. */
8552 tree
8554 tree arg3)
8555 {
8559 /* Distribute the expected value over short-circuiting operators.
8560 See through the cast from truthvalue_type_node to long. */
8567 /* If this is a builtin_expect within a builtin_expect keep the
8568 inner one. See through a comparison against a constant. It
8569 might have been added to create a thruthvalue. */
8585 {
8595 }
8597 /* If the argument isn't invariant then there's nothing else we can do. */
8601 /* If we expect that a comparison against the argument will fold to
8602 a constant return the constant. In practice, this means a true
8603 constant or the address of a non-weak symbol. */
8607 {
8608 do
8609 {
8611 }
8616 }
8618 /* Otherwise, ARG0 already has the proper type for the return value. */
8620 }
8622 /* Fold a call to __builtin_classify_type with argument ARG. */
8624 static tree
8626 {
8631 }
8633 /* Fold a call to __builtin_strlen with argument ARG. */
8635 static tree
8637 {
8640 else
8641 {
8642 c_strlen_data lendata = { };
8652 {
8658 }
8661 }
8662 }
8664 /* Fold a call to __builtin_inf or __builtin_huge_val. */
8666 static tree
8668 {
8669 REAL_VALUE_TYPE real;
8671 /* __builtin_inff is intended to be usable to define INFINITY on all
8672 targets. If an infinity is not available, INFINITY expands "to a
8673 positive constant of type float that overflows at translation
8674 time", footnote "In this case, using INFINITY will violate the
8675 constraint in 6.4.4 and thus require a diagnostic." (C99 7.12#4).
8676 Thus we pedwarn to ensure this constraint violation is
8677 diagnosed. */
8683 }
8685 /* Fold function call to builtin sincos, sincosf, or sincosl. Return
8686 NULL_TREE if no simplification can be made. */
8688 static tree
8691 {
8692 tree type;
8702 /* Calculate the result when the argument is a constant. */
8707 /* Canonicalize sincos to cexpi. */
8709 {
8712 }
8714 {
8721 }
8733 }
8735 /* Fold function call to builtin memcmp with arguments ARG1 and ARG2.
8736 Return NULL_TREE if no simplification can be made. */
8738 static tree
8740 {
8746 /* If the LEN parameter is zero, return zero. */
8751 /* If ARG1 and ARG2 are the same (and not volatile), return zero. */
8755 /* If len parameter is one, return an expression corresponding to
8756 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
8758 {
8760 tree cst_uchar_ptr_node
8763 tree ind1
8767 cst_uchar_ptr_node,
8768 arg1)));
8769 tree ind2
8773 cst_uchar_ptr_node,
8774 arg2)));
8776 }
8779 }
8781 /* Fold a call to builtin isascii with argument ARG. */
8783 static tree
8785 {
8788 else
8789 {
8790 /* Transform isascii(c) -> ((c & ~0x7f) == 0). */
8796 }
8797 }
8799 /* Fold a call to builtin toascii with argument ARG. */
8801 static tree
8803 {
8807 /* Transform toascii(c) -> (c & 0x7f). */
8810 }
8812 /* Fold a call to builtin isdigit with argument ARG. */
8814 static tree
8816 {
8819 else
8820 {
8821 /* Transform isdigit(c) -> (unsigned)(c) - '0' <= 9. */
8822 /* According to the C standard, isdigit is unaffected by locale.
8823 However, it definitely is affected by the target character set. */
8824 unsigned HOST_WIDE_INT target_digit0
8835 }
8836 }
8838 /* Fold a call to fabs, fabsf or fabsl with argument ARG. */
8840 static tree
8842 {
8848 }
8850 /* Fold a call to abs, labs, llabs or imaxabs with argument ARG. */
8852 static tree
8854 {
8860 }
8862 /* Fold a call to builtin carg(a+bi) -> atan2(b,a). */
8864 static tree
8866 {
8869 {
8873 {
8878 }
8879 }
8882 }
8884 /* Fold a call to builtin frexp, we can assume the base is 2. */
8886 static tree
8888 {
8899 /* Proceed if a valid pointer type was passed in. */
8901 {
8906 {
8908 /* For +-0, return (*exp = 0, +-0). */
8914 /* For +-NaN or +-Inf, *exp is unspecified, return arg0. */
8917 {
8918 /* Since the frexp function always expects base 2, and in
8919 GCC normalized significands are already in the range
8920 [0.5, 1.0), we have exactly what frexp wants. */
8925 }
8929 }
8931 /* Create the COMPOUND_EXPR (*arg1 = trunc, frac). */
8935 }
8938 }
8940 /* Fold a call to builtin modf. */
8942 static tree
8944 {
8955 /* Proceed if a valid pointer type was passed in. */
8957 {
8962 {
8965 /* For +-NaN or +-0, return (*arg1 = arg0, arg0). */
8969 /* For +-Inf, return (*arg1 = arg0, +-0). */
8975 /* Return (*arg1 = trunc(arg0), arg0-trunc(arg0)). */
8978 /* If the original number was negative and already
8979 integral, then the fractional part is -0.0. */
8983 }
8985 /* Create the COMPOUND_EXPR (*arg1 = trunc, frac). */
8991 }
8994 }
8996 /* Given a location LOC, an interclass builtin function decl FNDECL
8997 and its single argument ARG, return an folded expression computing
8998 the same, or NULL_TREE if we either couldn't or didn't want to fold
8999 (the latter happen if there's an RTL instruction available). */
9001 static tree
9003 {
9004 machine_mode mode;
9016 /* If there is no optab, try generic code. */
9018 {
9019 tree result;
9022 {
9023 /* isinf(x) -> isgreater(fabs(x),DBL_MAX). */
9026 REAL_VALUE_TYPE r;
9030 {
9031 /* NaN and Inf are encoded in the high-order double value
9032 only. The low-order value is not significant. */
9036 }
9043 }
9046 {
9047 /* isfinite(x) -> islessequal(fabs(x),DBL_MAX). */
9050 REAL_VALUE_TYPE r;
9054 {
9055 /* NaN and Inf are encoded in the high-order double value
9056 only. The low-order value is not significant. */
9060 }
9066 /*result = fold_build2_loc (loc, UNGT_EXPR,
9067 TREE_TYPE (TREE_TYPE (fndecl)),
9068 fold_build1_loc (loc, ABS_EXPR, type, arg),
9069 build_real (type, r));
9070 result = fold_build1_loc (loc, TRUTH_NOT_EXPR,
9071 TREE_TYPE (TREE_TYPE (fndecl)),
9072 result);*/
9074 }
9076 {
9077 /* isnormal(x) -> isgreaterequal(fabs(x),DBL_MIN) &
9078 islessequal(fabs(x),DBL_MAX). */
9088 {
9089 /* Use double to test the normal range of IBM extended
9090 precision. Emin for IBM extended precision is
9091 different to emin for IEEE double, being 53 higher
9092 since the low double exponent is at least 53 lower
9093 than the high double exponent. */
9097 }
9109 {
9110 /* Testing the high end of the range is done just using
9111 the high double, using the same test as isfinite().
9112 For the subnormal end of the range we first test the
9113 high double, then if its magnitude is equal to the
9114 limit of 0x1p-969, we test whether the low double is
9115 non-zero and opposite sign to the high double. */
9131 integer_type_node,
9137 }
9138 else
9139 {
9140 tree const isge_fn
9143 }
9147 }
9150 }
9153 }
9155 /* Fold a call to __builtin_isnan(), __builtin_isinf, __builtin_finite.
9156 ARG is the argument for the call. */
9158 static tree
9160 {
9167 {
9175 {
9176 /* isinf_sign(x) -> isinf(x) ? (signbit(x) ? -1 : 1) : 0 */
9177 /* In a boolean context, GCC will fold the inner COND_EXPR to
9178 1. So e.g. "if (isinf_sign(x))" would be folded to just
9179 "if (isinf(x) ? 1 : 0)" which becomes "if (isinf(x))". */
9187 {
9200 integer_zero_node);
9201 }
9204 }
9217 {
9220 {
9221 /* NaN and Inf are encoded in the high-order double value
9222 only. The low-order value is not significant. */
9224 }
9225 }
9231 }
9232 }
9234 /* Fold a call to __builtin_fpclassify(int, int, int, int, int, ...).
9235 This builtin will generate code to return the appropriate floating
9236 point classification depending on the value of the floating point
9237 number passed in. The possible return values must be supplied as
9238 int arguments to the call in the following order: FP_NAN, FP_INFINITE,
9239 FP_NORMAL, FP_SUBNORMAL and FP_ZERO. The ellipses is for exactly
9240 one floating point argument which is "type generic". */
9242 static tree
9244 {
9247 machine_mode mode;
9248 REAL_VALUE_TYPE r;
9251 /* Verify the required arguments in the original call. */
9271 /* fpclassify(x) ->
9272 isnan(x) ? FP_NAN :
9273 (fabs(x) == Inf ? FP_INFINITE :
9274 (fabs(x) >= DBL_MIN ? FP_NORMAL :
9275 (x == 0 ? FP_ZERO : FP_SUBNORMAL))). */
9289 {
9295 }
9298 {
9301 }
9304 }
9306 /* Fold a call to an unordered comparison function such as
9307 __builtin_isgreater(). FNDECL is the FUNCTION_DECL for the function
9308 being called and ARG0 and ARG1 are the arguments for the call.
9309 UNORDERED_CODE and ORDERED_CODE are comparison codes that give
9310 the opposite of the desired result. UNORDERED_CODE is used
9311 for modes that can hold NaNs and ORDERED_CODE is used for
9312 the rest. */
9314 static tree
9318 {
9332 /* Choose the wider of two real types. */
9344 {
9348 }
9353 }
9355 /* Fold __builtin_{,s,u}{add,sub,mul}{,l,ll}_overflow, either into normal
9356 arithmetics if it can never overflow, or into internal functions that
9357 return both result of arithmetics and overflowed boolean flag in
9358 a complex integer result, or some other check for overflow.
9359 Similarly fold __builtin_{add,sub,mul}_overflow_p to just the overflow
9360 checking part of that. */
9362 static tree
9365 {
9367 /* The code of the expression corresponding to the built-in. */
9372 {
9375 /* FALLTHRU */
9388 /* FALLTHRU */
9401 /* FALLTHRU */
9414 }
9416 /* For the "generic" overloads, the first two arguments can have different
9417 types and the last argument determines the target type to use to check
9418 for overflow. The arguments of the other overloads all have the same
9419 type. */
9422 /* For the __builtin_{add,sub,mul}_overflow_p builtins, when the first two
9423 arguments are constant, attempt to fold the built-in call into a constant
9424 expression indicating whether or not it detected an overflow. */
9428 /* Perform the computation in the target type and check for overflow. */
9432 arg2);
9436 {
9444 }
9445 else
9446 {
9454 }
9460 tree store
9463 }
9465 /* Fold a call to __builtin_FILE to a constant string. */
9469 {
9471 {
9472 /* The documentation says this builtin is equivalent to the preprocessor
9473 __FILE__ macro so it appears appropriate to use the same file prefix
9474 mappings. */
9477 }
9480 }
9482 /* Fold a call to __builtin_FUNCTION to a constant string. */
9486 {
9493 }
9495 /* Fold a call to __builtin_LINE to an integer constant. */
9499 {
9501 }
9503 /* Fold a call to built-in function FNDECL with 0 arguments.
9504 This function returns NULL_TREE if no simplification was possible. */
9506 static tree
9508 {
9512 {
9538 }
9540 }
9542 /* Fold a call to built-in function FNDECL with 1 argument, ARG0.
9543 This function returns NULL_TREE if no simplification was possible. */
9545 static tree
9547 {
9558 {
9560 {
9563 /* Gimplification will pull the CALL_EXPR for the builtin out of
9564 an if condition. When not optimizing, we'll not CSE it back.
9565 To avoid link error types of regressions, return false now. */
9570 }
9626 {
9631 }
9637 {
9642 }
9663 }
9667 }
9669 /* Fold a call to built-in function FNDECL with 2 arguments, ARG0 and ARG1.
9670 This function returns NULL_TREE if no simplification was possible. */
9672 static tree
9674 {
9686 {
9730 NOP_EXPR);
9732 /* We do the folding for va_start in the expander. */
9747 }
9749 }
9751 /* Fold a call to built-in function FNDECL with 3 arguments, ARG0, ARG1,
9752 and ARG2.
9753 This function returns NULL_TREE if no simplification was possible. */
9755 static tree
9758 {
9772 {
9821 }
9823 }
9825 /* Fold a call to built-in function FNDECL. ARGS is an array of NARGS
9826 arguments. IGNORE is true if the result of the
9827 function call is ignored. This function returns NULL_TREE if no
9828 simplification was possible. */
9830 tree
9832 {
9836 {
9852 }
9854 {
9858 }
9860 }
9862 /* Construct a new CALL_EXPR to FNDECL using the tail of the argument
9863 list ARGS along with N new arguments in NEWARGS. SKIP is the number
9864 of arguments in ARGS to be omitted. OLDNARGS is the number of
9865 elements in ARGS. */
9867 static tree
9870 {
9875 {
9883 }
9884 else
9888 }
9890 /* Return true if FNDECL shouldn't be folded right now.
9891 If a built-in function has an inline attribute always_inline
9892 wrapper, defer folding it after always_inline functions have
9893 been inlined, otherwise e.g. -D_FORTIFY_SOURCE checking
9894 might not be performed. */
9896 bool
9898 {
9901 && cfun
9904 }
9906 /* A wrapper function for builtin folding that prevents warnings for
9907 "statement without effect" and the like, caused by removing the
9908 call node earlier than the warning is generated. */
9910 tree
9912 {
9916 /* If CALL_EXPR_VA_ARG_PACK is set, the arguments aren't finalized
9917 yet. Defer folding until we see all the arguments
9918 (after inlining). */
9920 {
9923 /* Before gimplification CALL_EXPR_VA_ARG_PACK is not set, but
9924 instead last argument is __builtin_va_arg_pack (). Defer folding
9925 even in that case, until arguments are finalized. */
9927 {
9931 }
9939 else
9940 {
9945 }
9946 }
9948 }
9950 /* Fold a CALL_EXPR with type TYPE with FN as the function expression.
9951 N arguments are passed in the array ARGARRAY. Return a folded
9952 expression or NULL_TREE if no simplification was possible. */
9954 tree
9956 tree fn,
9959 {
9966 {
9967 /* If last argument is __builtin_va_arg_pack (), arguments to this
9968 function are not finalized yet. Defer folding until they are. */
9970 {
9974 }
9979 else
9981 }
9984 }
9986 /* Construct a new CALL_EXPR using the tail of the argument list of EXP
9987 along with N new arguments specified as the "..." parameters. SKIP
9988 is the number of arguments in EXP to be omitted. This function is used
9989 to do varargs-to-varargs transformations. */
9991 static tree
9993 {
9995 tree t;
10003 }
10005 /* Validate a single argument ARG against a tree code CODE representing
10006 a type. Return true when argument is valid. */
10008 static bool
10010 {
10018 }
10020 /* This function validates the types of a function call argument list
10021 against a specified list of tree_codes. If the last specifier is a 0,
10022 that represents an ellipses, otherwise the last specifier must be a
10023 VOID_TYPE.
10025 This is the GIMPLE version of validate_arglist. Eventually we want to
10026 completely convert builtins.c to work from GIMPLEs and the tree based
10027 validate_arglist will then be removed. */
10029 bool
10031 {
10035 const_tree arg;
10041 do
10042 {
10045 {
10047 /* This signifies an ellipses, any further arguments are all ok. */
10051 /* This signifies an endlink, if no arguments remain, return
10052 true, otherwise return false. */
10056 /* If no parameters remain or the parameter's code does not
10057 match the specified code, return false. Otherwise continue
10058 checking any remaining arguments. */
10063 }
10064 }
10067 /* We need gotos here since we can only have one VA_CLOSE in a
10068 function. */
10069 end: ;
10073 }
10075 /* Default target-specific builtin expander that does nothing. */
10077 rtx
10079 rtx target ATTRIBUTE_UNUSED,
10080 rtx subtarget ATTRIBUTE_UNUSED,
10081 machine_mode mode ATTRIBUTE_UNUSED,
10083 {
10085 }
10087 /* Returns true is EXP represents data that would potentially reside
10088 in a readonly section. */
10090 bool
10092 {
10102 /* Make sure we call decl_readonly_section only for trees it
10103 can handle (since it returns true for everything it doesn't
10104 understand). */
10109 else
10111 }
10113 /* Simplify a call to the strpbrk builtin. S1 and S2 are the arguments
10114 to the call, and TYPE is its return type.
10116 Return NULL_TREE if no simplification was possible, otherwise return the
10117 simplified form of the call as a tree.
10119 The simplified form may be a constant or other expression which
10120 computes the same value, but in a more efficient manner (including
10121 calls to other builtin functions).
10123 The call may contain arguments which need to be evaluated, but
10124 which are not useful to determine the result of the call. In
10125 this case we return a chain of COMPOUND_EXPRs. The LHS of each
10126 COMPOUND_EXPR will be an argument which must be evaluated.
10127 COMPOUND_EXPRs are chained through their RHS. The RHS of the last
10128 COMPOUND_EXPR in the chain will contain the tree for the simplified
10129 form of the builtin function call. */
10131 static tree
10133 {
10137 else
10138 {
10139 tree fn;
10148 {
10150 tree tem;
10155 /* Return an offset into the constant string argument. */
10158 }
10161 /* strpbrk(x, "") == NULL.
10162 Evaluate and ignore s1 in case it had side-effects. */
10172 /* New argument list transforming strpbrk(s1, s2) to
10173 strchr(s1, s2[0]). */
10176 }
10177 }
10179 /* Simplify a call to the strspn builtin. S1 and S2 are the arguments
10180 to the call.
10182 Return NULL_TREE if no simplification was possible, otherwise return the
10183 simplified form of the call as a tree.
10185 The simplified form may be a constant or other expression which
10186 computes the same value, but in a more efficient manner (including
10187 calls to other builtin functions).
10189 The call may contain arguments which need to be evaluated, but
10190 which are not useful to determine the result of the call. In
10191 this case we return a chain of COMPOUND_EXPRs. The LHS of each
10192 COMPOUND_EXPR will be an argument which must be evaluated.
10193 COMPOUND_EXPRs are chained through their RHS. The RHS of the last
10194 COMPOUND_EXPR in the chain will contain the tree for the simplified
10195 form of the builtin function call. */
10197 static tree
10199 {
10203 else
10204 {
10207 /* If either argument is "", return NULL_TREE. */
10209 /* Evaluate and ignore both arguments in case either one has
10210 side-effects. */
10214 }
10215 }
10217 /* Simplify a call to the strcspn builtin. S1 and S2 are the arguments
10218 to the call.
10220 Return NULL_TREE if no simplification was possible, otherwise return the
10221 simplified form of the call as a tree.
10223 The simplified form may be a constant or other expression which
10224 computes the same value, but in a more efficient manner (including
10225 calls to other builtin functions).
10227 The call may contain arguments which need to be evaluated, but
10228 which are not useful to determine the result of the call. In
10229 this case we return a chain of COMPOUND_EXPRs. The LHS of each
10230 COMPOUND_EXPR will be an argument which must be evaluated.
10231 COMPOUND_EXPRs are chained through their RHS. The RHS of the last
10232 COMPOUND_EXPR in the chain will contain the tree for the simplified
10233 form of the builtin function call. */
10235 static tree
10237 {
10241 else
10242 {
10243 /* If the first argument is "", return NULL_TREE. */
10246 {
10247 /* Evaluate and ignore argument s2 in case it has
10248 side-effects. */
10251 }
10253 /* If the second argument is "", return __builtin_strlen(s1). */
10256 {
10259 /* If the replacement _DECL isn't initialized, don't do the
10260 transformation. */
10265 }
10267 }
10268 }
10270 /* Fold the next_arg or va_start call EXP. Returns true if there was an error
10271 produced. False otherwise. This is done so that we don't output the error
10272 or warning twice or three times. */
10274 bool
10276 {
10279 tree arg;
10280 /* There is good chance the current input_location points inside the
10281 definition of the va_start macro (perhaps on the token for
10282 builtin) in a system header, so warnings will not be emitted.
10283 Use the location in real source code. */
10284 location_t current_location =
10286 NULL);
10289 {
10292 }
10295 {
10297 {
10300 }
10302 }
10303 /* We use __builtin_va_start (ap, 0, 0) or __builtin_next_arg (0, 0)
10304 when we checked the arguments and if needed issued a warning. */
10305 else
10306 {
10308 {
10309 /* Evidently an out of date version of <stdarg.h>; can't validate
10310 va_start's second argument, but can still work as intended. */
10312 OPT_Wvarargs,
10315 }
10317 {
10320 }
10322 }
10327 /* We destructively modify the call to be __builtin_va_start (ap, 0)
10328 or __builtin_next_arg (0) the first time we see it, after checking
10329 the arguments and if needed issuing a warning. */
10331 {
10334 /* Strip off all nops for the sake of the comparison. This
10335 is not quite the same as STRIP_NOPS. It does more.
10336 We must also strip off INDIRECT_EXPR for C++ reference
10337 parameters. */
10342 {
10343 /* FIXME: Sometimes with the tree optimizers we can get the
10344 not the last argument even though the user used the last
10345 argument. We just warn and set the arg to be the last
10346 argument so that we will get wrong-code because of
10347 it. */
10349 OPT_Wvarargs,
10351 }
10353 /* Undefined by C99 7.15.1.4p4 (va_start):
10354 "If the parameter parmN is declared with the register storage
10355 class, with a function or array type, or with a type that is
10356 not compatible with the type that results after application of
10357 the default argument promotions, the behavior is undefined."
10358 */
10360 {
10362 OPT_Wvarargs,
10363 "undefined behavior when second parameter of "
10365 }
10367 /* We want to verify the second parameter just once before the tree
10368 optimizers are run and then avoid keeping it in the tree,
10369 as otherwise we could warn even for correct code like:
10370 void foo (int i, ...)
10371 { va_list ap; i++; va_start (ap, i); va_end (ap); } */
10374 else
10376 }
10378 }
10381 /* Expand a call EXP to __builtin_object_size. */
10383 static rtx
10385 {
10386 tree ost;
10391 {
10396 }
10404 {
10409 }
10414 }
10416 /* Expand EXP, a call to the __mem{cpy,pcpy,move,set}_chk builtin.
10417 FCODE is the BUILT_IN_* to use.
10418 Return NULL_RTX if we failed; the caller should emit a normal call,
10419 otherwise try to get the result in TARGET, if convenient (and in
10420 mode MODE if that's convenient). */
10422 static rtx
10425 {
10427 POINTER_TYPE,
10428 fcode == BUILT_IN_MEMSET_CHK
10445 {
10446 /* Avoid transforming the checking call to an ordinary one when
10447 an overflow has been detected or when the call couldn't be
10448 validated because the size is not constant. */
10453 /* If __builtin_mem{cpy,pcpy,move,set}_chk is used, assume
10454 mem{cpy,pcpy,move,set} is available. */
10456 {
10471 }
10480 }
10483 else
10484 {
10487 /* If DEST is not a pointer type, call the normal function. */
10491 /* If SRC and DEST are the same (and not volatile), do nothing. */
10493 {
10494 tree expr;
10497 {
10498 /* Evaluate and ignore LEN in case it has side-effects. */
10501 }
10505 }
10507 /* __memmove_chk special case. */
10509 {
10515 /* If src is categorized for a readonly section we can use
10516 normal __memcpy_chk. */
10518 {
10527 }
10528 }
10530 }
10531 }
10533 /* Emit warning if a buffer overflow is detected at compile time. */
10535 static void
10537 {
10538 /* The source string. */
10540 /* The size of the destination object. */
10542 /* The string that is being concatenated with (as in __strcat_chk)
10543 or null if it isn't. */
10545 /* The maximum length of the source sequence in a bounded operation
10546 (such as __strncat_chk) or null if the operation isn't bounded
10547 (such as __strcat_chk). */
10549 /* The exact size of the access (such as in __strncpy_chk). */
10553 {
10561 /* For __strcat_chk the warning will be emitted only if overflowing
10562 by at least strlen (dest) + 1 bytes. */
10589 }
10592 {
10593 /* Check __strncat_chk. There is no way to determine the length
10594 of the string to which the source string is being appended so
10595 just warn when the length of the source string is not known. */
10598 }
10600 /* The destination argument is the first one for all built-ins above. */
10604 }
10606 /* Emit warning if a buffer overflow is detected at compile time
10607 in __sprintf_chk/__vsprintf_chk calls. */
10609 static void
10611 {
10616 /* Verify the required arguments in the original call. */
10626 /* Check whether the format is a literal string constant. */
10634 /* If the format doesn't contain % args or %%, we know its size. */
10637 /* If the format is "%s" and first ... argument is a string literal,
10638 we know it too. */
10641 {
10642 tree arg;
10653 }
10654 else
10657 /* Add one for the terminating nul. */
10662 }
10664 /* Emit warning if a free is called with address of a variable. */
10666 static void
10668 {
10685 else
10688 }
10690 /* Fold a call to __builtin_object_size with arguments PTR and OST,
10691 if possible. */
10693 static tree
10695 {
10712 /* __builtin_object_size doesn't evaluate side-effects in its arguments;
10713 if there are any side-effects, it returns (size_t) -1 for types 0 and 1
10714 and (size_t) 0 for types 2 and 3. */
10719 {
10723 }
10725 {
10726 /* If object size is not known yet, delay folding until
10727 later. Maybe subsequent passes will help determining
10728 it. */
10732 }
10735 }
10737 /* Builtins with folding operations that operate on "..." arguments
10738 need special handling; we need to store the arguments in a convenient
10739 data structure before attempting any folding. Fortunately there are
10740 only a few builtins that fall into this category. FNDECL is the
10741 function, EXP is the CALL_EXPR for the call. */
10743 static tree
10745 {
10750 {
10757 }
10759 {
10764 }
10766 }
10768 /* Initialize format string characters in the target charset. */
10770 bool
10772 {
10775 {
10798 }
10800 }
10802 /* Helper function for do_mpfr_arg*(). Ensure M is a normal number
10803 and no overflow/underflow occurred. INEXACT is true if M was not
10804 exactly calculated. TYPE is the tree type for the result. This
10805 function assumes that you cleared the MPFR flags and then
10806 calculated M to see if anything subsequently set a flag prior to
10807 entering this function. Return NULL_TREE if any checks fail. */
10809 static tree
10811 {
10812 /* Proceed iff we get a normal number, i.e. not NaN or Inf and no
10813 overflow/underflow occurred. If -frounding-math, proceed iff the
10814 result of calling FUNC was exact. */
10817 {
10818 REAL_VALUE_TYPE rr;
10821 /* Proceed iff GCC's REAL_VALUE_TYPE can hold the MPFR value,
10822 check for overflow/underflow. If the REAL_VALUE_TYPE is zero
10823 but the mpft_t is not, then we underflowed in the
10824 conversion. */
10827 {
10828 REAL_VALUE_TYPE rmode;
10831 /* Proceed iff the specified mode can hold the value. */
10834 }
10835 }
10837 }
10839 /* Helper function for do_mpc_arg*(). Ensure M is a normal complex
10840 number and no overflow/underflow occurred. INEXACT is true if M
10841 was not exactly calculated. TYPE is the tree type for the result.
10842 This function assumes that you cleared the MPFR flags and then
10843 calculated M to see if anything subsequently set a flag prior to
10844 entering this function. Return NULL_TREE if any checks fail, if
10845 FORCE_CONVERT is true, then bypass the checks. */
10847 static tree
10849 {
10850 /* Proceed iff we get a normal number, i.e. not NaN or Inf and no
10851 overflow/underflow occurred. If -frounding-math, proceed iff the
10852 result of calling FUNC was exact. */
10857 {
10862 /* Proceed iff GCC's REAL_VALUE_TYPE can hold the MPFR values,
10863 check for overflow/underflow. If the REAL_VALUE_TYPE is zero
10864 but the mpft_t is not, then we underflowed in the
10865 conversion. */
10870 {
10875 /* Proceed iff the specified mode can hold the value. */
10881 }
10882 }
10884 }
10886 /* If arguments ARG0 and ARG1 are REAL_CSTs, call mpfr_remquo() to set
10887 the pointer *(ARG_QUO) and return the result. The type is taken
10888 from the type of ARG0 and is used for setting the precision of the
10889 calculation and results. */
10891 static tree
10893 {
10900 /* To proceed, MPFR must exactly represent the target floating point
10901 format, which only happens when the target base equals two. */
10905 {
10910 {
10914 tree result_rem;
10923 /* Remquo is independent of the rounding mode, so pass
10924 inexact=0 to do_mpfr_ckconv(). */
10928 {
10929 /* MPFR calculates quo in the host's long so it may
10930 return more bits in quo than the target int can hold
10931 if sizeof(host long) > sizeof(target int). This can
10932 happen even for native compilers in LP64 mode. In
10933 these cases, modulo the quo value with the largest
10934 number that the target int can hold while leaving one
10935 bit for the sign. */
10939 /* Dereference the quo pointer argument. */
10941 /* Proceed iff a valid pointer type was passed in. */
10943 {
10944 /* Set the value. */
10945 tree result_quo
10948 integer_quo));
10950 /* Combine the quo assignment with the rem. */
10953 }
10954 }
10955 }
10956 }
10958 }
10960 /* If ARG is a REAL_CST, call mpfr_lgamma() on it and return the
10961 resulting value as a tree with type TYPE. The mpfr precision is
10962 set to the precision of TYPE. We assume that this mpfr function
10963 returns zero if the result could be calculated exactly within the
10964 requested precision. In addition, the integer pointer represented
10965 by ARG_SG will be dereferenced and set to the appropriate signgam
10966 (-1,1) value. */
10968 static tree
10970 {
10975 /* To proceed, MPFR must exactly represent the target floating point
10976 format, which only happens when the target base equals two. Also
10977 verify ARG is a constant and that ARG_SG is an int pointer. */
10982 {
10985 /* In addition to NaN and Inf, the argument cannot be zero or a
10986 negative integer. */
10990 {
10995 mpfr_t m;
10996 tree result_lg;
11005 {
11006 tree result_sg;
11008 /* Dereference the arg_sg pointer argument. */
11010 /* Assign the signgam value into *arg_sg. */
11015 /* Combine the signgam assignment with the lgamma result. */
11018 }
11019 }
11020 }
11023 }
11025 /* If arguments ARG0 and ARG1 are a COMPLEX_CST, call the two-argument
11026 mpc function FUNC on it and return the resulting value as a tree
11027 with type TYPE. The mpfr precision is set to the precision of
11028 TYPE. We assume that function FUNC returns zero if the result
11029 could be calculated exactly within the requested precision. If
11030 DO_NONFINITE is true, then fold expressions containing Inf or NaN
11031 in the arguments and/or results. */
11033 tree
11036 {
11042 /* To proceed, MPFR must exactly represent the target floating point
11043 format, which only happens when the target base equals two. */
11049 {
11058 {
11078 }
11079 }
11082 }
11084 /* A wrapper function for builtin folding that prevents warnings for
11085 "statement without effect" and the like, caused by removing the
11086 call node earlier than the warning is generated. */
11088 tree
11090 {
11096 {
11105 {
11107 }
11108 else
11109 {
11112 {
11113 /* Propagate location information from original call to
11114 expansion of builtin. Otherwise things like
11115 maybe_emit_chk_warning, that operate on the expansion
11116 of a builtin, will use the wrong location information. */
11118 {
11126 }
11128 }
11129 }
11130 }
11132 }
11134 /* Look up the function in builtin_decl that corresponds to DECL
11135 and set ASMSPEC as its user assembler name. DECL must be a
11136 function decl that declares a builtin. */
11138 void
11140 {
11149 {
11153 }
11154 }
11156 /* Return true if DECL is a builtin that expands to a constant or similarly
11157 simple code. */
11158 bool
11160 {
11163 {
11164 /* Builtins that expand to constants. */
11169 /* Simple register moves or loads from stack. */
11180 /* Exception state returns or moves registers around. */
11188 }
11191 }
11193 /* Return true if DECL is a builtin that is not expensive, i.e., they are
11194 most probably expanded inline into reasonably simple code. This is a
11195 superset of is_simple_builtin. */
11196 bool
11198 {
11205 {
11207 CASE_BUILT_IN_ALLOCA:
11273 }
11276 }
11278 /* Return true if T is a constant and the value cast to a target char
11279 can be represented by a host char.
11280 Store the casted char constant in *P if so. */
11282 bool
11284 {
11290 }
11292 /* Return true if the builtin DECL is implemented in a standard library.
11293 Otherwise returns false which doesn't guarantee it is not (thus the list of
11294 handled builtins below may be incomplete). */
11296 bool
11298 {
11301 {
11375 }
11377 }