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1 /* Expand builtin functions.
2 Copyright (C) 1988-2018 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. */
77 #if SWITCHABLE_TARGET
79 #endif
81 /* Define the names of the builtin function types and codes. */
85 #define DEF_BUILTIN(X, N, C, T, LT, B, F, NA, AT, IM, COND) #X,
87 {
89 };
91 /* Setup an array of builtin_info_type, make sure each element decl is
92 initialized to NULL_TREE. */
95 /* Non-zero if __builtin_constant_p should be folded right away. */
197 /* Return true if NAME starts with __builtin_ or __sync_. */
199 static bool
201 {
209 }
211 /* Return true if NODE should be considered for inline expansion regardless
212 of the optimization level. This means whenever a function is invoked with
213 its "internal" name, which normally contains the prefix "__builtin". */
215 bool
217 {
218 /* Note that we must use DECL_NAME, not DECL_ASSEMBLER_NAME_SET_P since
219 we want the name used to call the function, not the name it
220 will have. */
223 }
225 /* Compute values M and N such that M divides (address of EXP - N) and such
226 that N < M. If these numbers can be determined, store M in alignp and N in
227 *BITPOSP and return true. Otherwise return false and store BITS_PER_UNIT to
228 *alignp and any bit-offset to *bitposp.
230 Note that the address (and thus the alignment) computed here is based
231 on the address to which a symbol resolves, whereas DECL_ALIGN is based
232 on the address at which an object is actually located. These two
233 addresses are not always the same. For example, on ARM targets,
234 the address &foo of a Thumb function foo() has the lowest bit set,
235 whereas foo() itself starts on an even address.
237 If ADDR_P is true we are taking the address of the memory reference EXP
238 and thus cannot rely on the access taking place. */
240 static bool
243 {
245 tree offset;
246 machine_mode mode;
251 /* Get the innermost object and the constant (bitpos) and possibly
252 variable (offset) offset of the access. */
256 /* Extract alignment information from the innermost object and
257 possibly adjust bitpos and offset. */
259 {
260 /* Function addresses can encode extra information besides their
261 alignment. However, if TARGET_PTRMEMFUNC_VBIT_LOCATION
262 allows the low bit to be used as a virtual bit, we know
263 that the address itself must be at least 2-byte aligned. */
266 }
268 ;
270 {
271 /* The alignment of a CONST_DECL is determined by its initializer. */
278 }
280 {
283 }
287 {
293 /* If the address is explicitely aligned, handle that. */
296 {
301 }
303 known_alignment
307 /* Re-apply explicit alignment to the bitpos. */
310 /* The alignment of the pointer operand in a TARGET_MEM_REF
311 has to take the variable offset parts into account. */
313 {
315 {
320 }
324 }
326 /* When EXP is an actual memory reference then we can use
327 TYPE_ALIGN of a pointer indirection to derive alignment.
328 Do so only if get_pointer_alignment_1 did not reveal absolute
329 alignment knowledge and if using that alignment would
330 improve the situation. */
336 else
337 {
338 /* Else adjust bitpos accordingly. */
343 }
344 }
346 {
347 /* STRING_CST are the only constant objects we allow to be not
348 wrapped inside a CONST_DECL. */
354 }
356 /* If there is a non-constant offset part extract the maximum
357 alignment that can prevail. */
359 {
362 {
366 }
367 }
369 /* Account for the alignment of runtime coefficients, so that the constant
370 bitpos is guaranteed to be accurate. */
373 {
376 }
381 }
383 /* For a memory reference expression EXP compute values M and N such that M
384 divides (&EXP - N) and such that N < M. If these numbers can be determined,
385 store M in alignp and N in *BITPOSP and return true. Otherwise return false
386 and store BITS_PER_UNIT to *alignp and any bit-offset to *bitposp. */
388 bool
391 {
393 }
395 /* Return the alignment in bits of EXP, an object. */
397 unsigned int
399 {
405 /* align and bitpos now specify known low bits of the pointer.
406 ptr & (align - 1) == bitpos. */
411 }
413 /* For a pointer valued expression EXP compute values M and N such that M
414 divides (EXP - N) and such that N < M. If these numbers can be determined,
415 store M in alignp and N in *BITPOSP and return true. Return false if
416 the results are just a conservative approximation.
418 If EXP is not a pointer, false is returned too. */
420 bool
423 {
430 {
437 else
438 {
441 {
445 }
446 }
450 }
453 {
458 {
461 /* Make sure to return a sensible alignment when the multiplication
462 by BITS_PER_UNIT overflowed. */
465 /* We cannot really tell whether this result is an approximation. */
467 }
468 else
469 {
473 }
474 }
476 {
481 }
486 }
488 /* Return the alignment in bits of EXP, a pointer valued expression.
489 The alignment returned is, by default, the alignment of the thing that
490 EXP points to. If it is not a POINTER_TYPE, 0 is returned.
492 Otherwise, look at the expression to see if we can do better, i.e., if the
493 expression is actually pointing at an object whose alignment is tighter. */
495 unsigned int
497 {
503 /* align and bitpos now specify known low bits of the pointer.
504 ptr & (align - 1) == bitpos. */
510 }
512 /* Return the number of leading non-zero elements in the sequence
513 [ PTR, PTR + MAXELTS ) where each element's size is ELTSIZE bytes.
514 ELTSIZE must be a power of 2 less than 8. Used by c_strlen. */
516 unsigned
518 {
524 {
525 /* Optimize the common case of plain char. */
527 {
531 }
532 }
533 else
534 {
536 {
540 }
541 }
543 }
545 /* For a call at LOC to a function FN that expects a string in the argument
546 ARG, issue a diagnostic due to it being a called with an argument
547 declared at NONSTR that is a character array with no terminating NUL. */
549 void
551 {
559 {
563 }
564 }
566 /* If EXP refers to an unterminated constant character array return
567 the declaration of the object of which the array is a member or
568 element and if SIZE is not null, set *SIZE to the size of
569 the unterminated array and set *EXACT if the size is exact or
570 clear it otherwise. Otherwise return null. */
572 tree
574 {
575 /* C_STRLEN will return NULL and set DECL in the info
576 structure if EXP references a unterminated array. */
577 c_strlen_data data;
581 {
583 {
586 {
587 /* Constant offsets are already accounted for in data.len, but
588 not in a SSA_NAME + CST expression. */
593 {
594 /* Subtract the offset from the size of the array. */
599 }
600 else
602 }
603 else
607 }
609 }
612 }
614 /* Compute the length of a null-terminated character string or wide
615 character string handling character sizes of 1, 2, and 4 bytes.
616 TREE_STRING_LENGTH is not the right way because it evaluates to
617 the size of the character array in bytes (as opposed to characters)
618 and because it can contain a zero byte in the middle.
620 ONLY_VALUE should be nonzero if the result is not going to be emitted
621 into the instruction stream and zero if it is going to be expanded.
622 E.g. with i++ ? "foo" : "bar", if ONLY_VALUE is nonzero, constant 3
623 is returned, otherwise NULL, since
624 len = c_strlen (src, 1); if (len) expand_expr (len, ...); would not
625 evaluate the side-effects.
627 If ONLY_VALUE is two then we do not emit warnings about out-of-bound
628 accesses. Note that this implies the result is not going to be emitted
629 into the instruction stream.
631 Additional information about the string accessed may be recorded
632 in DATA. For example, if SRC references an unterminated string,
633 then the declaration will be stored in the DECL field. If the
634 length of the unterminated string can be determined, it'll be
635 stored in the LEN field. Note this length could well be different
636 than what a C strlen call would return.
638 ELTSIZE is 1 for normal single byte character strings, and 2 or
639 4 for wide characer strings. ELTSIZE is by default 1.
641 The value returned is of type `ssizetype'. */
643 tree
645 {
646 /* If we were not passed a DATA pointer, then get one to a local
647 structure. That avoids having to check DATA for NULL before
648 each time we want to use it. */
649 c_strlen_data local_strlen_data;
658 {
665 }
673 /* Offset from the beginning of the string in bytes. */
674 tree byteoff;
675 tree memsize;
676 tree decl;
681 /* Determine the size of the string element. */
685 /* Set MAXELTS to sizeof (SRC) / sizeof (*SRC) - 1, the maximum possible
686 length of SRC. Prefer TYPE_SIZE() to TREE_STRING_LENGTH() if possible
687 in case the latter is less than the size of the array, such as when
688 SRC refers to a short string literal used to initialize a large array.
689 In that case, the elements of the array after the terminating NUL are
690 all NUL. */
699 /* PTR can point to the byte representation of any string type, including
700 char* and wchar_t*. */
704 {
705 /* The code below works only for single byte character types. */
709 /* If the string has an internal NUL character followed by any
710 non-NUL characters (e.g., "foo\0bar"), we can't compute
711 the offset to the following NUL if we don't know where to
712 start searching for it. */
715 /* Return when an embedded null character is found or none at all.
716 In the latter case, set the DECL/LEN field in the DATA structure
717 so that callers may examine them. */
721 {
726 }
728 /* For empty strings the result should be zero. */
732 /* We don't know the starting offset, but we do know that the string
733 has no internal zero bytes. If the offset falls within the bounds
734 of the string subtract the offset from the length of the string,
735 and return that. Otherwise the length is zero. Take care to
736 use SAVE_EXPR in case the OFFSET has side-effects. */
744 }
746 /* Offset from the beginning of the string in elements. */
747 HOST_WIDE_INT eltoff;
749 /* We have a known offset into the string. Start searching there for
750 a null character if we can represent it as a single HOST_WIDE_INT. */
755 else
758 /* If the offset is known to be out of bounds, warn, and call strlen at
759 runtime. */
761 {
762 /* Suppress multiple warnings for propagated constant strings. */
765 {
768 eltoff);
770 }
772 }
774 /* If eltoff is larger than strelts but less than maxelts the
775 string length is zero, since the excess memory will be zero. */
779 /* Use strlen to search for the first zero byte. Since any strings
780 constructed with build_string will have nulls appended, we win even
781 if we get handed something like (char[4])"abcd".
783 Since ELTOFF is our starting index into the string, no further
784 calculation is needed. */
788 /* Don't know what to return if there was no zero termination.
789 Ideally this would turn into a gcc_checking_assert over time.
790 Set DECL/LEN so callers can examine them. */
792 {
797 }
800 }
802 /* Return a constant integer corresponding to target reading
803 GET_MODE_BITSIZE (MODE) bits from string constant STR. */
805 static rtx
807 {
808 HOST_WIDE_INT ch;
822 {
834 }
838 }
840 /* Cast a target constant CST to target CHAR and if that value fits into
841 host char type, return zero and put that value into variable pointed to by
842 P. */
844 static int
846 {
853 /* Do not care if it fits or not right here. */
868 }
870 /* Similar to save_expr, but assumes that arbitrary code is not executed
871 in between the multiple evaluations. In particular, we assume that a
872 non-addressable local variable will not be modified. */
874 static tree
876 {
884 }
886 /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
887 times to get the address of either a higher stack frame, or a return
888 address located within it (depending on FNDECL_CODE). */
890 static rtx
892 {
896 {
897 /* For a zero count with __builtin_return_address, we don't care what
898 frame address we return, because target-specific definitions will
899 override us. Therefore frame pointer elimination is OK, and using
900 the soft frame pointer is OK.
902 For a nonzero count, or a zero count with __builtin_frame_address,
903 we require a stable offset from the current frame pointer to the
904 previous one, so we must use the hard frame pointer, and
905 we must disable frame pointer elimination. */
908 else
909 {
912 /* Tell reload not to eliminate the frame pointer. */
914 }
915 }
920 /* On the SPARC, the return address is not in the frame, it is in a
921 register. There is no way to access it off of the current frame
922 pointer, but it can be accessed off the previous frame pointer by
923 reading the value from the register window save area. */
925 count--;
927 /* Scan back COUNT frames to the specified frame. */
929 {
930 /* Assume the dynamic chain pointer is in the word that the
931 frame address points to, unless otherwise specified. */
936 }
938 /* For __builtin_frame_address, return what we've got. But, on
939 the SPARC for example, we may have to add a bias. */
943 /* For __builtin_return_address, get the return address from that frame. */
944 #ifdef RETURN_ADDR_RTX
946 #else
950 #endif
952 }
954 /* Alias set used for setjmp buffer. */
957 /* Construct the leading half of a __builtin_setjmp call. Control will
958 return to RECEIVER_LABEL. This is also called directly by the SJLJ
959 exception handling code. */
961 void
963 {
965 rtx stack_save;
966 rtx mem;
975 /* We store the frame pointer and the address of receiver_label in
976 the buffer and use the rest of it for the stack save area, which
977 is machine-dependent. */
996 /* If there is further processing to do, do it. */
1000 /* We have a nonlocal label. */
1002 }
1004 /* Construct the trailing part of a __builtin_setjmp call. This is
1005 also called directly by the SJLJ exception handling code.
1006 If RECEIVER_LABEL is NULL, instead contruct a nonlocal goto handler. */
1008 void
1010 {
1011 rtx chain;
1013 /* Mark the FP as used when we get here, so we have to make sure it's
1014 marked as used by this function. */
1017 /* Mark the static chain as clobbered here so life information
1018 doesn't get messed up for it. */
1023 /* Now put in the code to restore the frame pointer, and argument
1024 pointer, if needed. */
1026 {
1027 /* First adjust our frame pointer to its actual value. It was
1028 previously set to the start of the virtual area corresponding to
1029 the stacked variables when we branched here and now needs to be
1030 adjusted to the actual hardware fp value.
1032 Assignments to virtual registers are converted by
1033 instantiate_virtual_regs into the corresponding assignment
1034 to the underlying register (fp in this case) that makes
1035 the original assignment true.
1036 So the following insn will actually be decrementing fp by
1037 TARGET_STARTING_FRAME_OFFSET. */
1040 /* Restoring the frame pointer also modifies the hard frame pointer.
1041 Mark it used (so that the previous assignment remains live once
1042 the frame pointer is eliminated) and clobbered (to represent the
1043 implicit update from the assignment). */
1046 }
1049 {
1050 /* If the argument pointer can be eliminated in favor of the
1051 frame pointer, we don't need to restore it. We assume here
1052 that if such an elimination is present, it can always be used.
1053 This is the case on all known machines; if we don't make this
1054 assumption, we do unnecessary saving on many machines. */
1064 {
1065 /* Now restore our arg pointer from the address at which it
1066 was saved in our stack frame. */
1069 }
1070 }
1076 else
1079 /* We must not allow the code we just generated to be reordered by
1080 scheduling. Specifically, the update of the frame pointer must
1081 happen immediately, not later. */
1083 }
1085 /* __builtin_longjmp is passed a pointer to an array of five words (not
1086 all will be used on all machines). It operates similarly to the C
1087 library function of the same name, but is more efficient. Much of
1088 the code below is copied from the handling of non-local gotos. */
1090 static void
1092 {
1097 /* DRAP is needed for stack realign if longjmp is expanded to current
1098 function */
1109 /* We require that the user must pass a second argument of 1, because
1110 that is what builtin_setjmp will return. */
1116 else
1117 {
1128 /* Pick up FP, label, and SP from the block and jump. This code is
1129 from expand_goto in stmt.c; see there for detailed comments. */
1131 /* We have to pass a value to the nonlocal_goto pattern that will
1132 get copied into the static_chain pointer, but it does not matter
1133 what that value is, because builtin_setjmp does not use it. */
1135 else
1136 {
1148 }
1149 }
1151 /* Search backwards and mark the jump insn as a non-local goto.
1152 Note that this precludes the use of __builtin_longjmp to a
1153 __builtin_setjmp target in the same function. However, we've
1154 already cautioned the user that these functions are for
1155 internal exception handling use only. */
1157 {
1161 {
1164 }
1167 }
1168 }
1172 {
1174 }
1176 /* This function validates the types of a function call argument list
1177 against a specified list of tree_codes. If the last specifier is a 0,
1178 that represents an ellipsis, otherwise the last specifier must be a
1179 VOID_TYPE. */
1181 static bool
1183 {
1187 const_call_expr_arg_iterator iter;
1188 const_tree arg;
1193 /* Get a bitmap of pointer argument numbers declared attribute nonnull. */
1198 {
1202 {
1204 /* This signifies an ellipses, any further arguments are all ok. */
1208 /* This signifies an endlink, if no arguments remain, return
1209 true, otherwise return false. */
1213 /* The actual argument must be nonnull when either the whole
1214 called function has been declared nonnull, or when the formal
1215 argument corresponding to the actual argument has been. */
1218 {
1223 }
1224 /* FALLTHRU */
1226 /* If no parameters remain or the parameter's code does not
1227 match the specified code, return false. Otherwise continue
1228 checking any remaining arguments. */
1233 }
1234 }
1236 /* We need gotos here since we can only have one VA_CLOSE in a
1237 function. */
1238 end: ;
1244 }
1246 /* Expand a call to __builtin_nonlocal_goto. We're passed the target label
1247 and the address of the save area. */
1249 static rtx
1251 {
1266 /* Copy the address of the save location to a register just in case it was
1267 based on the frame pointer. */
1276 /* ??? We no longer need to pass the static chain value, afaik. */
1279 else
1280 {
1286 /* Restore frame pointer for containing function. */
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, movmemsi, ..). 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. */
1648 {
1652 }
1654 /* Return the address of the block. */
1656 }
1658 /* __builtin_apply_args returns block of memory allocated on
1659 the stack into which is stored the arg pointer, structure
1660 value address, static chain, and all the registers that might
1661 possibly be used in performing a function call. The code is
1662 moved to the start of the function so the incoming values are
1663 saved. */
1665 static rtx
1667 {
1668 /* Don't do __builtin_apply_args more than once in a function.
1669 Save the result of the first call and reuse it. */
1672 {
1673 /* When this function is called, it means that registers must be
1674 saved on entry to this function. So we migrate the
1675 call to the first insn of this function. */
1676 rtx temp;
1685 /* Put the insns after the NOTE that starts the function.
1686 If this is inside a start_sequence, make the outer-level insn
1687 chain current, so the code is placed at the start of the
1688 function. If internal_arg_pointer is a non-virtual pseudo,
1689 it needs to be placed after the function that initializes
1690 that pseudo. */
1695 else
1699 }
1700 }
1702 /* Perform an untyped call and save the state required to perform an
1703 untyped return of whatever value was returned by the given function. */
1705 static rtx
1707 {
1709 fixed_size_mode mode;
1718 /* Create a block where the return registers can be saved. */
1721 /* Fetch the arg pointer from the ARGUMENTS block. */
1728 /* Push a new argument block and copy the arguments. Do not allow
1729 the (potential) memcpy call below to interfere with our stack
1730 manipulations. */
1732 NO_DEFER_POP;
1734 /* Save the stack with nonlocal if available. */
1737 else
1740 /* Allocate a block of memory onto the stack and copy the memory
1741 arguments to the outgoing arguments address. We can pass TRUE
1742 as the 4th argument because we just saved the stack pointer
1743 and will restore it right after the call. */
1746 /* Set DRAP flag to true, even though allocate_dynamic_stack_space
1747 may have already set current_function_calls_alloca to true.
1748 current_function_calls_alloca won't be set if argsize is zero,
1749 so we have to guarantee need_drap is true here. */
1755 {
1758 else
1760 }
1767 /* Refer to the argument block. */
1772 /* Walk past the arg-pointer and structure value address. */
1777 /* Restore each of the registers previously saved. Make USE insns
1778 for each of these registers for use in making the call. */
1781 {
1789 }
1791 /* Restore the structure value address unless this is passed as an
1792 "invisible" first argument. */
1795 {
1802 }
1804 /* All arguments and registers used for the call are set up by now! */
1807 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
1808 and we don't want to load it into a register as an optimization,
1809 because prepare_call_address already did it if it should be done. */
1813 /* Generate the actual call instruction and save the return value. */
1815 {
1819 }
1821 {
1824 /* Locate the unique return register. It is not possible to
1825 express a call that sets more than one return register using
1826 call_value; use untyped_call for that. In fact, untyped_call
1827 only needs to save the return registers in the given block. */
1830 {
1834 }
1841 }
1842 else
1845 /* Find the CALL insn we just emitted, and attach the register usage
1846 information. */
1850 /* Restore the stack. */
1853 else
1857 OK_DEFER_POP;
1859 /* Return the address of the result block. */
1862 }
1864 /* Perform an untyped return. */
1866 static void
1868 {
1870 fixed_size_mode mode;
1871 rtx reg;
1880 {
1885 }
1887 /* Restore the return value and note that each value is used. */
1891 {
1903 }
1905 /* Put the USE insns before the return. */
1908 /* Return whatever values was restored by jumping directly to the end
1909 of the function. */
1911 }
1913 /* Used by expand_builtin_classify_type and fold_builtin_classify_type. */
1915 static enum type_class
1917 {
1919 {
1938 }
1939 }
1941 /* Expand a call EXP to __builtin_classify_type. */
1943 static rtx
1945 {
1949 }
1951 /* This helper macro, meant to be used in mathfn_built_in below, determines
1952 which among a set of builtin math functions is appropriate for a given type
1953 mode. The `F' (float) and `L' (long double) are automatically generated
1954 from the 'double' case. If a function supports the _Float<N> and _Float<N>X
1955 types, there are additional types that are considered with 'F32', 'F64',
1956 'F128', etc. suffixes. */
1957 #define CASE_MATHFN(MATHFN) \
1958 CASE_CFN_##MATHFN: \
1959 fcode = BUILT_IN_##MATHFN; fcodef = BUILT_IN_##MATHFN##F ; \
1960 fcodel = BUILT_IN_##MATHFN##L ; break;
1961 /* Similar to the above, but also add support for the _Float<N> and _Float<N>X
1962 types. */
1963 #define CASE_MATHFN_FLOATN(MATHFN) \
1964 CASE_CFN_##MATHFN: \
1965 fcode = BUILT_IN_##MATHFN; fcodef = BUILT_IN_##MATHFN##F ; \
1966 fcodel = BUILT_IN_##MATHFN##L ; fcodef16 = BUILT_IN_##MATHFN##F16 ; \
1967 fcodef32 = BUILT_IN_##MATHFN##F32; fcodef64 = BUILT_IN_##MATHFN##F64 ; \
1968 fcodef128 = BUILT_IN_##MATHFN##F128 ; fcodef32x = BUILT_IN_##MATHFN##F32X ; \
1969 fcodef64x = BUILT_IN_##MATHFN##F64X ; fcodef128x = BUILT_IN_##MATHFN##F128X ;\
1970 break;
1971 /* Similar to above, but appends _R after any F/L suffix. */
1972 #define CASE_MATHFN_REENT(MATHFN) \
1973 case CFN_BUILT_IN_##MATHFN##_R: \
1974 case CFN_BUILT_IN_##MATHFN##F_R: \
1975 case CFN_BUILT_IN_##MATHFN##L_R: \
1976 fcode = BUILT_IN_##MATHFN##_R; fcodef = BUILT_IN_##MATHFN##F_R ; \
1977 fcodel = BUILT_IN_##MATHFN##L_R ; break;
1979 /* Return a function equivalent to FN but operating on floating-point
1980 values of type TYPE, or END_BUILTINS if no such function exists.
1981 This is purely an operation on function codes; it does not guarantee
1982 that the target actually has an implementation of the function. */
1984 static built_in_function
1986 {
1987 tree mtype;
1998 {
2089 }
2112 else
2114 }
2116 /* Return mathematic function equivalent to FN but operating directly on TYPE,
2117 if available. If IMPLICIT_P is true use the implicit builtin declaration,
2118 otherwise use the explicit declaration. If we can't do the conversion,
2119 return null. */
2121 static tree
2123 {
2132 }
2134 /* Like mathfn_built_in_1, but always use the implicit array. */
2136 tree
2138 {
2140 }
2142 /* Like mathfn_built_in_1, but take a built_in_function and
2143 always use the implicit array. */
2145 tree
2147 {
2149 }
2151 /* If BUILT_IN_NORMAL function FNDECL has an associated internal function,
2152 return its code, otherwise return IFN_LAST. Note that this function
2153 only tests whether the function is defined in internals.def, not whether
2154 it is actually available on the target. */
2156 internal_fn
2158 {
2162 {
2163 #define DEF_INTERNAL_FLT_FN(NAME, FLAGS, OPTAB, TYPE) \
2164 CASE_FLT_FN (BUILT_IN_##NAME): return IFN_##NAME;
2165 #define DEF_INTERNAL_FLT_FLOATN_FN(NAME, FLAGS, OPTAB, TYPE) \
2166 CASE_FLT_FN (BUILT_IN_##NAME): return IFN_##NAME; \
2167 CASE_FLT_FN_FLOATN_NX (BUILT_IN_##NAME): return IFN_##NAME;
2168 #define DEF_INTERNAL_INT_FN(NAME, FLAGS, OPTAB, TYPE) \
2169 CASE_INT_FN (BUILT_IN_##NAME): return IFN_##NAME;
2186 }
2187 }
2189 /* If CALL is a call to a BUILT_IN_NORMAL function that could be replaced
2190 on the current target by a call to an internal function, return the
2191 code of that internal function, otherwise return IFN_LAST. The caller
2192 is responsible for ensuring that any side-effects of the built-in
2193 call are dealt with correctly. E.g. if CALL sets errno, the caller
2194 must decide that the errno result isn't needed or make it available
2195 in some other way. */
2197 internal_fn
2199 {
2201 {
2204 {
2209 }
2210 }
2212 }
2214 /* Expand a call to the builtin trinary math functions (fma).
2215 Return NULL_RTX if a normal call should be emitted rather than expanding the
2216 function in-line. EXP is the expression that is a call to the builtin
2217 function; if convenient, the result should be placed in TARGET.
2218 SUBTARGET may be used as the target for computing one of EXP's
2219 operands. */
2221 static rtx
2223 {
2224 optab builtin_optab;
2229 machine_mode mode;
2239 {
2245 }
2247 /* Make a suitable register to place result in. */
2250 /* Before working hard, check whether the instruction is available. */
2256 /* Always stabilize the argument list. */
2267 /* Compute into RESULT.
2268 Set RESULT to wherever the result comes back. */
2272 /* If we were unable to expand via the builtin, stop the sequence
2273 (without outputting the insns) and call to the library function
2274 with the stabilized argument list. */
2276 {
2279 }
2281 /* Output the entire sequence. */
2287 }
2289 /* Expand a call to the builtin sin and cos math functions.
2290 Return NULL_RTX if a normal call should be emitted rather than expanding the
2291 function in-line. EXP is the expression that is a call to the builtin
2292 function; if convenient, the result should be placed in TARGET.
2293 SUBTARGET may be used as the target for computing one of EXP's
2294 operands. */
2296 static rtx
2298 {
2299 optab builtin_optab;
2300 rtx op0;
2303 machine_mode mode;
2304 tree arg;
2312 {
2318 }
2320 /* Make a suitable register to place result in. */
2323 /* Check if sincos insn is available, otherwise fallback
2324 to sin or cos insn. */
2327 {
2334 }
2336 /* Before working hard, check whether the instruction is available. */
2338 {
2341 /* Wrap the computation of the argument in a SAVE_EXPR, as we may
2342 need to expand the argument again. This way, we will not perform
2343 side-effects more the once. */
2350 /* Compute into RESULT.
2351 Set RESULT to wherever the result comes back. */
2353 {
2357 {
2366 }
2368 }
2369 else
2373 {
2374 /* Output the entire sequence. */
2379 }
2381 /* If we were unable to expand via the builtin, stop the sequence
2382 (without outputting the insns) and call to the library function
2383 with the stabilized argument list. */
2385 }
2388 }
2390 /* Given an interclass math builtin decl FNDECL and it's argument ARG
2391 return an RTL instruction code that implements the functionality.
2392 If that isn't possible or available return CODE_FOR_nothing. */
2394 static enum insn_code
2396 {
2399 machine_mode mode;
2402 {
2416 /* These builtins have no optabs (yet). */
2420 }
2422 /* There's no easy way to detect the case we need to set EDOM. */
2426 /* Optab mode depends on the mode of the input argument. */
2432 }
2434 /* Expand a call to one of the builtin math functions that operate on
2435 floating point argument and output an integer result (ilogb, isinf,
2436 isnan, etc).
2437 Return 0 if a normal call should be emitted rather than expanding the
2438 function in-line. EXP is the expression that is a call to the builtin
2439 function; if convenient, the result should be placed in TARGET. */
2441 static rtx
2443 {
2445 rtx op0;
2447 machine_mode mode;
2448 tree arg;
2458 {
2463 /* Wrap the computation of the argument in a SAVE_EXPR, as we may
2464 need to expand the argument again. This way, we will not perform
2465 side-effects more the once. */
2480 }
2483 }
2485 /* Expand a call to the builtin sincos math function.
2486 Return NULL_RTX if a normal call should be emitted rather than expanding the
2487 function in-line. EXP is the expression that is a call to the builtin
2488 function. */
2490 static rtx
2492 {
2494 machine_mode mode;
2508 /* Make a suitable register to place result in. */
2511 /* Check if sincos insn is available, otherwise emit the call. */
2526 /* Compute into target1 and target2.
2527 Set TARGET to wherever the result comes back. */
2531 /* Move target1 and target2 to the memory locations indicated
2532 by op1 and op2. */
2537 }
2539 /* Expand a call to the internal cexpi builtin to the sincos math function.
2540 EXP is the expression that is a call to the builtin function; if convenient,
2541 the result should be placed in TARGET. */
2543 static rtx
2545 {
2548 machine_mode mode;
2559 /* Try expanding via a sincos optab, fall back to emitting a libcall
2560 to sincos or cexp. We are sure we have sincos or cexp because cexpi
2561 is only generated from sincos, cexp or if we have either of them. */
2563 {
2569 /* Compute into op1 and op2. */
2571 }
2573 {
2584 else
2594 /* Make sure not to fold the sincos call again. */
2598 }
2599 else
2600 {
2610 else
2613 /* If we don't have a decl for cexp create one. This is the
2614 friendliest fallback if the user calls __builtin_cexpi
2615 without full target C99 function support. */
2617 {
2618 tree fntype;
2630 }
2635 /* Make sure not to fold the cexp call again. */
2639 }
2641 /* Now build the proper return type. */
2646 }
2648 /* Conveniently construct a function call expression. FNDECL names the
2649 function to be called, N is the number of arguments, and the "..."
2650 parameters are the argument expressions. Unlike build_call_exr
2651 this doesn't fold the call, hence it will always return a CALL_EXPR. */
2653 static tree
2655 {
2665 }
2667 /* Expand a call to one of the builtin rounding functions gcc defines
2668 as an extension (lfloor and lceil). As these are gcc extensions we
2669 do not need to worry about setting errno to EDOM.
2670 If expanding via optab fails, lower expression to (int)(floor(x)).
2671 EXP is the expression that is a call to the builtin function;
2672 if convenient, the result should be placed in TARGET. */
2674 static rtx
2676 {
2677 convert_optab builtin_optab;
2682 tree fallback_fndecl;
2683 machine_mode mode;
2684 tree arg;
2692 {
2709 }
2711 /* Make a suitable register to place result in. */
2716 /* Wrap the computation of the argument in a SAVE_EXPR, as we may
2717 need to expand the argument again. This way, we will not perform
2718 side-effects more the once. */
2725 /* Compute into TARGET. */
2727 {
2728 /* Output the entire sequence. */
2733 }
2735 /* If we were unable to expand via the builtin, stop the sequence
2736 (without outputting the insns). */
2739 /* Fall back to floating point rounding optab. */
2742 /* For non-C99 targets we may end up without a fallback fndecl here
2743 if the user called __builtin_lfloor directly. In this case emit
2744 a call to the floor/ceil variants nevertheless. This should result
2745 in the best user experience for not full C99 targets. */
2747 {
2748 tree fntype;
2752 {
2785 }
2790 }
2797 /* Truncate the result of floating point optab to integer
2798 via expand_fix (). */
2803 }
2805 /* Expand a call to one of the builtin math functions doing integer
2806 conversion (lrint).
2807 Return 0 if a normal call should be emitted rather than expanding the
2808 function in-line. EXP is the expression that is a call to the builtin
2809 function; if convenient, the result should be placed in TARGET. */
2811 static rtx
2813 {
2814 convert_optab builtin_optab;
2815 rtx op0;
2818 tree arg;
2819 machine_mode mode;
2828 {
2847 }
2849 /* There's no easy way to detect the case we need to set EDOM. */
2853 /* Make a suitable register to place result in. */
2856 /* There's no easy way to detect the case we need to set EDOM. */
2858 {
2861 /* Wrap the computation of the argument in a SAVE_EXPR, as we may
2862 need to expand the argument again. This way, we will not perform
2863 side-effects more the once. */
2871 {
2872 /* Output the entire sequence. */
2877 }
2879 /* If we were unable to expand via the builtin, stop the sequence
2880 (without outputting the insns) and call to the library function
2881 with the stabilized argument list. */
2883 }
2886 {
2887 /* Fall back to rounding to long int. Use implicit_p 0 - for non-C99
2888 targets, (int) round (x) should never be transformed into
2889 BUILT_IN_IROUND and if __builtin_iround is called directly, emit
2890 a call to lround in the hope that the target provides at least some
2891 C99 functions. This should result in the best user experience for
2892 not full C99 targets. */
2893 tree fallback_fndecl = mathfn_built_in_1
2902 }
2905 }
2907 /* Expand a call to the powi built-in mathematical function. Return NULL_RTX if
2908 a normal call should be emitted rather than expanding the function
2909 in-line. EXP is the expression that is a call to the builtin
2910 function; if convenient, the result should be placed in TARGET. */
2912 static rtx
2914 {
2917 machine_mode mode;
2918 machine_mode mode2;
2927 /* Emit a libcall to libgcc. */
2929 /* Mode of the 2nd argument must match that of an int. */
2947 }
2949 /* Expand expression EXP which is a call to the strlen builtin. Return
2950 NULL_RTX if we failed and the caller should emit a normal call, otherwise
2951 try to get the result in TARGET, if convenient. */
2953 static rtx
2955 machine_mode target_mode)
2956 {
2961 rtx pat;
2962 tree len;
2964 rtx src_reg;
2966 machine_mode insn_mode;
2970 /* If the length can be computed at compile-time, return it. */
2975 /* If the length can be computed at compile-time and is constant
2976 integer, but there are side-effects in src, evaluate
2977 src for side-effects, then return len.
2978 E.g. x = strlen (i++ ? "xfoo" + 1 : "bar");
2979 can be optimized into: i++; x = 3; */
2982 {
2985 }
2989 /* If SRC is not a pointer type, don't do this operation inline. */
2993 /* Bail out if we can't compute strlen in the right mode. */
2995 {
2999 }
3003 /* Make a place to hold the source address. We will not expand
3004 the actual source until we are sure that the expansion will
3005 not fail -- there are trees that cannot be expanded twice. */
3008 /* Mark the beginning of the strlen sequence so we can emit the
3009 source operand later. */
3019 /* Check to see if the argument was declared attribute nonstring
3020 and if so, issue a warning since at this point it's not known
3021 to be nul-terminated. */
3024 /* Now that we are assured of success, expand the source. */
3028 {
3029 #ifdef POINTERS_EXTEND_UNSIGNED
3032 POINTERS_EXTEND_UNSIGNED);
3033 #endif
3035 }
3041 else
3044 /* Return the value in the proper mode for this function. */
3049 else
3053 }
3055 /* Expand call EXP to the strnlen built-in, returning the result
3056 and setting it in TARGET. Otherwise return NULL_RTX on failure. */
3058 static rtx
3060 {
3077 /* FIXME: Change c_strlen() to return sizetype instead of ssizetype
3078 so these conversions aren't necessary. */
3079 c_strlen_data data;
3086 {
3090 "%K%qD specified bound %E "
3097 {
3098 /* Clear EXACT if LEN may be less than SRC suggests,
3099 such as in
3100 strnlen (&a[i], sizeof a)
3101 where the value of i is unknown. Unless i's value is
3102 zero, the call is unsafe because the bound is greater. */
3106 }
3112 {
3113 location_t warnloc
3117 exact
3123 {
3128 }
3129 }
3136 }
3149 "%K%qD specified bound [%wu, %wu] "
3156 {
3160 }
3166 {
3167 location_t warnloc
3171 exact
3177 {
3181 }
3182 }
3192 }
3194 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
3195 bytes from constant string DATA + OFFSET and return it as target
3196 constant. */
3198 static rtx
3200 scalar_int_mode mode)
3201 {
3209 }
3211 /* LEN specify length of the block of memcpy/memset operation.
3212 Figure out its range and put it into MIN_SIZE/MAX_SIZE.
3213 In some cases we can make very likely guess on max size, then we
3214 set it into PROBABLE_MAX_SIZE. */
3216 static void
3221 {
3223 {
3226 }
3227 else
3228 {
3232 /* Determine bounds from the type. */
3235 else
3240 else
3246 {
3251 }
3253 {
3254 /* Anti range 0...N lets us to determine minimal size to N+1. */
3256 {
3259 }
3260 /* Code like
3262 int n;
3263 if (n < 100)
3264 memcpy (a, b, n)
3266 Produce anti range allowing negative values of N. We still
3267 can use the information and make a guess that N is not negative.
3268 */
3271 }
3272 }
3276 }
3278 /* Try to verify that the sizes and lengths of the arguments to a string
3279 manipulation function given by EXP are within valid bounds and that
3280 the operation does not lead to buffer overflow or read past the end.
3281 Arguments other than EXP may be null. When non-null, the arguments
3282 have the following meaning:
3283 DST is the destination of a copy call or NULL otherwise.
3284 SRC is the source of a copy call or NULL otherwise.
3285 DSTWRITE is the number of bytes written into the destination obtained
3286 from the user-supplied size argument to the function (such as in
3287 memcpy(DST, SRCs, DSTWRITE) or strncpy(DST, DRC, DSTWRITE).
3288 MAXREAD is the user-supplied bound on the length of the source sequence
3289 (such as in strncat(d, s, N). It specifies the upper limit on the number
3290 of bytes to write. If NULL, it's taken to be the same as DSTWRITE.
3291 SRCSTR is the source string (such as in strcpy(DST, SRC)) when the
3292 expression EXP is a string function call (as opposed to a memory call
3293 like memcpy). As an exception, SRCSTR can also be an integer denoting
3294 the precomputed size of the source string or object (for functions like
3295 memcpy).
3296 DSTSIZE is the size of the destination object specified by the last
3297 argument to the _chk builtins, typically resulting from the expansion
3298 of __builtin_object_size (such as in __builtin___strcpy_chk(DST, SRC,
3299 DSTSIZE).
3301 When DSTWRITE is null LEN is checked to verify that it doesn't exceed
3302 SIZE_MAX.
3304 If the call is successfully verified as safe return true, otherwise
3305 return false. */
3307 static bool
3310 {
3313 /* The size of the largest object is half the address space, or
3314 PTRDIFF_MAX. (This is way too permissive.) */
3317 /* Either the length of the source string for string functions or
3318 the size of the source object for raw memory functions. */
3323 /* Set to true when the exact number of bytes written by a string
3324 function like strcpy is not known and the only thing that is
3325 known is that it must be at least one (for the terminating nul). */
3328 {
3329 /* SRCSTR is normally a pointer to string but as a special case
3330 it can be an integer denoting the length of a string. */
3332 {
3333 /* Try to determine the range of lengths the source string
3334 refers to. If it can be determined and is less than
3335 the upper bound given by MAXREAD add one to it for
3336 the terminating nul. Otherwise, set it to one for
3337 the same reason, or to MAXREAD as appropriate. */
3340 {
3343 else
3354 }
3355 else
3356 {
3359 }
3360 }
3361 else
3363 }
3366 {
3367 /* When the only available piece of data is the object size
3368 there is nothing to do. */
3372 /* Otherwise, when the length of the source sequence is known
3373 (as with strlen), set DSTWRITE to it. */
3376 }
3386 /* First check the number of bytes to be written against the maximum
3387 object size. */
3391 {
3401 "%K%qD specified size %E "
3404 else
3406 "%K%qD specified size between %E and %E "
3414 }
3416 /* The number of bytes to write is "exact" if DSTWRITE is non-null,
3417 constant, and in range of unsigned HOST_WIDE_INT. */
3420 /* Next check the number of bytes to be written against the destination
3421 object size. */
3423 {
3428 || (dstwrite
3431 {
3439 {
3440 /* This is a call to strcpy with a destination of 0 size
3441 and a source of unknown length. The call will write
3442 at least one byte past the end of the destination. */
3444 "%K%qD writing %E or more bytes into a region "
3447 }
3450 "%K%qD writing %E byte into a region "
3452 "%K%qD writing %E bytes into a region "
3456 {
3457 /* Avoid printing the upper bound if it's invalid. */
3459 "%K%qD writing %E or more bytes into a region "
3462 }
3463 else
3465 "%K%qD writing between %E and %E bytes into "
3468 dstsize);
3470 /* Return error when an overflow has been detected. */
3472 }
3473 }
3475 /* Check the maximum length of the source sequence against the size
3476 of the destination object if known, or against the maximum size
3477 of an object. */
3479 {
3482 /* Use the lower end for MAXREAD from now on. */
3487 {
3492 {
3496 /* Warn about crazy big sizes first since that's more
3497 likely to be meaningful than saying that the bound
3498 is greater than the object size if both are big. */
3501 "%K%qD specified bound %E "
3505 else
3507 "%K%qD specified bound between %E and %E "
3513 }
3516 {
3522 "%K%qD specified bound %E "
3526 else
3528 "%K%qD specified bound between %E and %E "
3533 }
3534 }
3535 }
3537 /* Check for reading past the end of SRC. */
3542 {
3554 {
3555 /* Avoid printing the upper bound if it's invalid. */
3557 "%K%qD reading %E or more bytes from a region "
3560 }
3561 else
3563 "%K%qD reading between %E and %E bytes from a region "
3567 }
3570 }
3572 /* Helper to compute the size of the object referenced by the DEST
3573 expression which must have pointer type, using Object Size type
3574 OSTYPE (only the least significant 2 bits are used). Return
3575 an estimate of the size of the object if successful or NULL when
3576 the size cannot be determined. When the referenced object involves
3577 a non-constant offset in some range the returned value represents
3578 the largest size given the smallest non-negative offset in the
3579 range. The function is intended for diagnostics and should not
3580 be used to influence code generation or optimization. */
3582 tree
3584 {
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. */
3644 ;
3648 else
3650 }
3651 }
3652 }
3653 }
3656 }
3658 /* Unless computing the largest size (for memcpy and other raw memory
3659 functions), try to determine the size of the object from its type. */
3674 {
3675 /* Return the constant size unless it's zero (that's a zero-length
3676 array likely at the end of a struct). */
3681 }
3684 }
3686 /* Helper to determine and check the sizes of the source and the destination
3687 of calls to __builtin_{bzero,memcpy,mempcpy,memset} calls. EXP is the
3688 call expression, DEST is the destination argument, SRC is the source
3689 argument or null, and LEN is the number of bytes. Use Object Size type-0
3690 regardless of the OPT_Wstringop_overflow_ setting. Return true on success
3691 (no overflow or invalid sizes), false otherwise. */
3693 static bool
3695 {
3696 /* For functions like memset and memcpy that operate on raw memory
3697 try to determine the size of the largest source and destination
3698 object using type-0 Object Size regardless of the object size
3699 type specified by the option. */
3705 }
3707 /* Validate memchr arguments without performing any expansion.
3708 Return NULL_RTX. */
3710 static rtx
3712 {
3720 /* Diagnose calls where the specified length exceeds the size
3721 of the object. */
3723 {
3727 }
3730 }
3732 /* Expand a call EXP to the memcpy builtin.
3733 Return NULL_RTX if we failed, the caller should emit a normal call,
3734 otherwise try to get the result in TARGET, if convenient (and in
3735 mode MODE if that's convenient). */
3737 static rtx
3739 {
3752 }
3754 /* Check a call EXP to the memmove built-in for validity.
3755 Return NULL_RTX on both success and failure. */
3757 static rtx
3759 {
3771 }
3773 /* Expand a call EXP to the mempcpy builtin.
3774 Return NULL_RTX if we failed; the caller should emit a normal call,
3775 otherwise try to get the result in TARGET, if convenient (and in
3776 mode MODE if that's convenient). If ENDP is 0 return the
3777 destination pointer, if ENDP is 1 return the end pointer ala
3778 mempcpy, and if ENDP is 2 return the end pointer minus one ala
3779 stpcpy. */
3781 static rtx
3783 {
3792 /* Policy does not generally allow using compute_objsize (which
3793 is used internally by check_memop_size) to change code generation
3794 or drive optimization decisions.
3796 In this instance it is safe because the code we generate has
3797 the same semantics regardless of the return value of
3798 check_memop_sizes. Exactly the same amount of data is copied
3799 and the return value is exactly the same in both cases.
3801 Furthermore, check_memop_size always uses mode 0 for the call to
3802 compute_objsize, so the imprecise nature of compute_objsize is
3803 avoided. */
3805 /* Avoid expanding mempcpy into memcpy when the call is determined
3806 to overflow the buffer. This also prevents the same overflow
3807 from being diagnosed again when expanding memcpy. */
3813 }
3815 /* Helper function to do the actual work for expand of memory copy family
3816 functions (memcpy, mempcpy, stpcpy). Expansing should assign LEN bytes
3817 of memory from SRC to DEST and assign to TARGET if convenient.
3818 If ENDP is 0 return the
3819 destination pointer, if ENDP is 1 return the end pointer ala
3820 mempcpy, and if ENDP is 2 return the end pointer minus one ala
3821 stpcpy. */
3823 static rtx
3826 {
3837 /* If DEST is not a pointer type, call the normal function. */
3841 /* If either SRC is not a pointer type, don't do this
3842 operation in-line. */
3859 /* If SRC is a string constant and block move would be done
3860 by pieces, we can avoid loading the string from memory
3861 and only stored the computed constants. */
3868 {
3870 builtin_memcpy_read_str,
3876 }
3881 /* Copy word part most expediently. */
3894 {
3897 }
3900 {
3902 /* stpcpy pointer to last byte. */
3905 }
3908 }
3910 static rtx
3913 {
3915 endp);
3916 }
3918 /* Expand into a movstr instruction, if one is available. Return NULL_RTX if
3919 we failed, the caller should emit a normal call, otherwise try to
3920 get the result in TARGET, if convenient. If ENDP is 0 return the
3921 destination pointer, if ENDP is 1 return the end pointer ala
3922 mempcpy, and if ENDP is 2 return the end pointer minus one ala
3923 stpcpy. */
3925 static rtx
3927 {
3929 rtx dest_mem;
3930 rtx src_mem;
3938 {
3941 }
3950 {
3952 /* movstr is supposed to set end to the address of the NUL
3953 terminator. If the caller requested a mempcpy-like return value,
3954 adjust it. */
3956 {
3960 }
3961 }
3963 }
3965 /* Do some very basic size validation of a call to the strcpy builtin
3966 given by EXP. Return NULL_RTX to have the built-in expand to a call
3967 to the library function. */
3969 static rtx
3971 {
3979 /* There is no way here to determine the length of the string in
3980 the destination to which the SRC string is being appended so
3981 just diagnose cases when the souce string is longer than
3982 the destination object. */
3987 destsize);
3990 }
3992 /* Expand expression EXP, which is a call to the strcpy builtin. Return
3993 NULL_RTX if we failed the caller should emit a normal call, otherwise
3994 try to get the result in TARGET, if convenient (and in mode MODE if that's
3995 convenient). */
3997 static rtx
3999 {
4007 {
4011 }
4014 {
4015 /* Check to see if the argument was declared attribute nonstring
4016 and if so, issue a warning since at this point it's not known
4017 to be nul-terminated. */
4021 }
4024 }
4026 /* Helper function to do the actual work for expand_builtin_strcpy. The
4027 arguments to the builtin_strcpy call DEST and SRC are broken out
4028 so that this can also be called without constructing an actual CALL_EXPR.
4029 The other arguments and return value are the same as for
4030 expand_builtin_strcpy. */
4032 static rtx
4034 {
4035 /* Detect strcpy calls with unterminated arrays.. */
4037 {
4038 /* NONSTR refers to the non-nul terminated constant array. */
4042 }
4045 }
4047 /* Expand a call EXP to the stpcpy builtin.
4048 Return NULL_RTX if we failed the caller should emit a normal call,
4049 otherwise try to get the result in TARGET, if convenient (and in
4050 mode MODE if that's convenient). */
4052 static rtx
4054 {
4065 {
4069 }
4071 /* If return value is ignored, transform stpcpy into strcpy. */
4073 {
4077 }
4078 else
4079 {
4081 rtx ret;
4083 /* Ensure we get an actual string whose length can be evaluated at
4084 compile-time, not an expression containing a string. This is
4085 because the latter will potentially produce pessimized code
4086 when used to produce the return value. */
4087 c_strlen_data data;
4104 {
4108 {
4112 {
4114 {
4117 else
4119 }
4128 }
4129 }
4130 }
4133 }
4134 }
4136 /* Expand a call EXP to the stpcpy builtin and diagnose uses of nonstring
4137 arguments while being careful to avoid duplicate warnings (which could
4138 be issued if the expander were to expand the call, resulting in it
4139 being emitted in expand_call(). */
4141 static rtx
4143 {
4145 {
4146 /* The call has been successfully expanded. Check for nonstring
4147 arguments and issue warnings as appropriate. */
4150 }
4153 }
4155 /* Check a call EXP to the stpncpy built-in for validity.
4156 Return NULL_RTX on both success and failure. */
4158 static rtx
4160 {
4166 /* The source and destination of the call. */
4170 /* The exact number of bytes to write (not the maximum). */
4173 /* The size of the destination object. */
4179 }
4181 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
4182 bytes from constant string DATA + OFFSET and return it as target
4183 constant. */
4185 rtx
4187 scalar_int_mode mode)
4188 {
4195 }
4197 /* Helper to check the sizes of sequences and the destination of calls
4198 to __builtin_strncat and __builtin___strncat_chk. Returns true on
4199 success (no overflow or invalid sizes), false otherwise. */
4201 static bool
4203 {
4208 /* Try to determine the range of lengths that the source expression
4209 refers to. */
4213 /* Try to verify that the destination is big enough for the shortest
4214 string. */
4217 {
4218 /* If it hasn't been provided by __strncat_chk, try to determine
4219 the size of the destination object into which the source is
4220 being copied. */
4222 }
4224 /* Add one for the terminating nul. */
4227 size_one_node)
4230 /* The strncat function copies at most MAXREAD bytes and always appends
4231 the terminating nul so the specified upper bound should never be equal
4232 to (or greater than) the size of the destination. */
4235 {
4244 }
4252 /* The number of bytes to write is LEN but check_access will also
4253 check SRCLEN if LEN's value isn't known. */
4255 objsize);
4256 }
4258 /* Similar to expand_builtin_strcat, do some very basic size validation
4259 of a call to the strcpy builtin given by EXP. Return NULL_RTX to have
4260 the built-in expand to a call to the library function. */
4262 static rtx
4264 {
4272 /* The upper bound on the number of bytes to write. */
4274 /* The length of the source sequence. */
4277 /* Try to determine the range of lengths that the source expression
4278 refers to. */
4282 else
4285 /* Try to verify that the destination is big enough for the shortest
4286 string. First try to determine the size of the destination object
4287 into which the source is being copied. */
4290 /* Add one for the terminating nul. */
4293 size_one_node)
4296 /* The strncat function copies at most MAXREAD bytes and always appends
4297 the terminating nul so the specified upper bound should never be equal
4298 to (or greater than) the size of the destination. */
4301 {
4310 }
4318 /* The number of bytes to write is SRCLEN. */
4322 }
4324 /* Expand expression EXP, which is a call to the strncpy builtin. Return
4325 NULL_RTX if we failed the caller should emit a normal call. */
4327 static rtx
4329 {
4334 {
4337 /* The number of bytes to write (not the maximum). */
4339 /* The length of the source sequence. */
4343 {
4347 /* The number of bytes to write is LEN but check_access will also
4348 check SLEN if LEN's value isn't known. */
4350 destsize);
4351 }
4353 /* We must be passed a constant len and src parameter. */
4359 /* We're required to pad with trailing zeros if the requested
4360 len is greater than strlen(s2)+1. In that case try to
4361 use store_by_pieces, if it fails, punt. */
4363 {
4366 rtx dest_mem;
4370 builtin_strncpy_read_str,
4377 builtin_strncpy_read_str,
4382 }
4383 }
4385 }
4387 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
4388 bytes from constant string DATA + OFFSET and return it as target
4389 constant. */
4391 rtx
4393 scalar_int_mode mode)
4394 {
4401 }
4403 /* Callback routine for store_by_pieces. Return the RTL of a register
4404 containing GET_MODE_SIZE (MODE) consecutive copies of the unsigned
4405 char value given in the RTL register data. For example, if mode is
4406 4 bytes wide, return the RTL for 0x01010101*data. */
4408 static rtx
4410 scalar_int_mode mode)
4411 {
4427 }
4429 /* Expand expression EXP, which is a call to the memset builtin. Return
4430 NULL_RTX if we failed the caller should emit a normal call, otherwise
4431 try to get the result in TARGET, if convenient (and in mode MODE if that's
4432 convenient). */
4434 static rtx
4436 {
4448 }
4450 /* Helper function to do the actual work for expand_builtin_memset. The
4451 arguments to the builtin_memset call DEST, VAL, and LEN are broken out
4452 so that this can also be called without constructing an actual CALL_EXPR.
4453 The other arguments and return value are the same as for
4454 expand_builtin_memset. */
4456 static rtx
4459 {
4462 machine_mode val_mode;
4474 /* If DEST is not a pointer type, don't do this operation in-line. */
4485 /* If the LEN parameter is zero, return DEST. */
4487 {
4488 /* Evaluate and ignore VAL in case it has side-effects. */
4491 }
4493 /* Stabilize the arguments in case we fail. */
4505 {
4506 rtx val_rtx;
4511 /* Assume that we can memset by pieces if we can store
4512 * the coefficients by pieces (in the required modes).
4513 * We can't pass builtin_memset_gen_str as that emits RTL. */
4519 {
4524 }
4528 probable_max_size))
4534 }
4540 {
4551 probable_max_size))
4557 }
4565 probable_max_size);
4568 {
4571 }
4575 do_libcall:
4584 else
4589 }
4591 /* Expand expression EXP, which is a call to the bzero builtin. Return
4592 NULL_RTX if we failed the caller should emit a normal call. */
4594 static rtx
4596 {
4605 /* New argument list transforming bzero(ptr x, int y) to
4606 memset(ptr x, int 0, size_t y). This is done this way
4607 so that if it isn't expanded inline, we fallback to
4608 calling bzero instead of memset. */
4616 }
4618 /* Try to expand cmpstr operation ICODE with the given operands.
4619 Return the result rtx on success, otherwise return null. */
4621 static rtx
4623 HOST_WIDE_INT align)
4624 {
4638 }
4640 /* Expand expression EXP, which is a call to the memcmp built-in function.
4641 Return NULL_RTX if we failed and the caller should emit a normal call,
4642 otherwise try to get the result in TARGET, if convenient.
4643 RESULT_EQ is true if we can relax the returned value to be either zero
4644 or nonzero, without caring about the sign. */
4646 static rtx
4648 {
4659 /* Diagnose calls where the specified length exceeds the size of either
4660 object. */
4666 {
4671 }
4673 /* If the specified length exceeds the size of either object,
4674 call the function. */
4678 /* Due to the performance benefit, always inline the calls first
4679 when result_eq is false. */
4683 {
4687 }
4695 /* If we don't have POINTER_TYPE, call the function. */
4703 /* Set MEM_SIZE as appropriate. */
4705 {
4708 }
4714 {
4718 }
4720 /* If SRC is a string constant and block move would be done
4721 by pieces, we can avoid loading the string from memory
4722 and only stored the computed constants. */
4734 {
4735 /* Return the value in the proper mode for this function. */
4740 {
4743 }
4746 }
4749 }
4751 /* Expand expression EXP, which is a call to the strcmp builtin. Return NULL_RTX
4752 if we failed the caller should emit a normal call, otherwise try to get
4753 the result in TARGET, if convenient. */
4755 static rtx
4757 {
4761 /* Due to the performance benefit, always inline the calls first. */
4778 /* If we don't have POINTER_TYPE, call the function. */
4782 /* Stabilize the arguments in case gen_cmpstr(n)si fail. */
4789 /* Try to call cmpstrsi. */
4794 /* Try to determine at least one length and call cmpstrnsi. */
4796 {
4797 tree len;
4798 rtx arg3_rtx;
4808 /* If we don't have a constant length for the first, use the length
4809 of the second, if we know it. We don't require a constant for
4810 this case; some cost analysis could be done if both are available
4811 but neither is constant. For now, assume they're equally cheap,
4812 unless one has side effects. If both strings have constant lengths,
4813 use the smaller. */
4829 else
4832 /* If both arguments have side effects, we cannot optimize. */
4834 {
4836 result = expand_cmpstrn_or_cmpmem
4839 }
4840 }
4844 {
4845 /* Check to see if the argument was declared attribute nonstring
4846 and if so, issue a warning since at this point it's not known
4847 to be nul-terminated. */
4850 /* Return the value in the proper mode for this function. */
4858 }
4860 /* Expand the library call ourselves using a stabilized argument
4861 list to avoid re-evaluating the function's arguments twice. */
4866 }
4868 /* Expand expression EXP, which is a call to the strncmp builtin. Return
4869 NULL_RTX if we failed the caller should emit a normal call, otherwise try to get
4870 the result in TARGET, if convenient. */
4872 static rtx
4874 ATTRIBUTE_UNUSED machine_mode mode)
4875 {
4880 /* Due to the performance benefit, always inline the calls first. */
4886 /* If c_strlen can determine an expression for one of the string
4887 lengths, and it doesn't have side effects, then emit cmpstrnsi
4888 using length MIN(strlen(string)+1, arg3). */
4893 tree len;
4914 /* If we don't have a constant length for the first, use the length
4915 of the second, if we know it. If neither string is constant length,
4916 use the given length argument. We don't require a constant for
4917 this case; some cost analysis could be done if both are available
4918 but neither is constant. For now, assume they're equally cheap,
4919 unless one has side effects. If both strings have constant lengths,
4920 use the smaller. */
4938 else
4941 /* If we are not using the given length, we must incorporate it here.
4942 The actual new length parameter will be MIN(len,arg3) in this case. */
4944 {
4947 }
4957 {
4958 /* Check to see if the argument was declared attribute nonstring
4959 and if so, issue a warning since at this point it's not known
4960 to be nul-terminated. */
4963 /* Return the value in the proper mode for this function. */
4971 }
4973 /* Expand the library call ourselves using a stabilized argument
4974 list to avoid re-evaluating the function's arguments twice. */
4979 }
4981 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
4982 if that's convenient. */
4984 rtx
4986 {
4987 rtx val;
4990 /* Don't do __builtin_saveregs more than once in a function.
4991 Save the result of the first call and reuse it. */
4995 /* When this function is called, it means that registers must be
4996 saved on entry to this function. So we migrate the call to the
4997 first insn of this function. */
5001 /* Do whatever the machine needs done in this case. */
5009 /* Put the insns after the NOTE that starts the function. If this
5010 is inside a start_sequence, make the outer-level insn chain current, so
5011 the code is placed at the start of the function. */
5017 }
5019 /* Expand a call to __builtin_next_arg. */
5021 static rtx
5023 {
5024 /* Checking arguments is already done in fold_builtin_next_arg
5025 that must be called before this function. */
5030 }
5032 /* Make it easier for the backends by protecting the valist argument
5033 from multiple evaluations. */
5035 static tree
5037 {
5040 /* The current way of determining the type of valist is completely
5041 bogus. We should have the information on the va builtin instead. */
5046 {
5050 /* For this case, the backends will be expecting a pointer to
5051 vatype, but it's possible we've actually been given an array
5052 (an actual TARGET_CANONICAL_VA_LIST_TYPE (valist)).
5053 So fix it. */
5055 {
5058 }
5059 }
5060 else
5061 {
5065 {
5071 }
5077 }
5080 }
5082 /* The "standard" definition of va_list is void*. */
5084 tree
5086 {
5088 }
5090 /* The "standard" abi va_list is va_list_type_node. */
5092 tree
5094 {
5096 }
5098 /* The "standard" type of va_list is va_list_type_node. */
5100 tree
5102 {
5109 {
5110 /* If va_list is an array type, the argument may have decayed
5111 to a pointer type, e.g. by being passed to another function.
5112 In that case, unwrap both types so that we can compare the
5113 underlying records. */
5116 {
5119 }
5120 }
5125 }
5127 /* The "standard" implementation of va_start: just assign `nextarg' to
5128 the variable. */
5130 void
5132 {
5135 }
5137 /* Expand EXP, a call to __builtin_va_start. */
5139 static rtx
5141 {
5142 rtx nextarg;
5143 tree valist;
5147 {
5150 }
5160 else
5164 }
5166 /* Expand EXP, a call to __builtin_va_end. */
5168 static rtx
5170 {
5173 /* Evaluate for side effects, if needed. I hate macros that don't
5174 do that. */
5179 }
5181 /* Expand EXP, a call to __builtin_va_copy. We do this as a
5182 builtin rather than just as an assignment in stdarg.h because of the
5183 nastiness of array-type va_list types. */
5185 static rtx
5187 {
5200 {
5204 }
5205 else
5206 {
5209 /* Evaluate to pointers. */
5218 /* "Dereference" to BLKmode memories. */
5226 /* Copy. */
5228 }
5231 }
5233 /* Expand a call to one of the builtin functions __builtin_frame_address or
5234 __builtin_return_address. */
5236 static rtx
5238 {
5239 /* The argument must be a nonnegative integer constant.
5240 It counts the number of frames to scan up the stack.
5241 The value is either the frame pointer value or the return
5242 address saved in that frame. */
5244 /* Warning about missing arg was already issued. */
5247 {
5250 }
5251 else
5252 {
5253 /* Number of frames to scan up the stack. */
5258 /* Some ports cannot access arbitrary stack frames. */
5260 {
5263 }
5266 {
5267 /* Warn since no effort is made to ensure that any frame
5268 beyond the current one exists or can be safely reached. */
5271 }
5273 /* For __builtin_frame_address, return what we've got. */
5281 }
5282 }
5284 /* Expand EXP, a call to the alloca builtin. Return NULL_RTX if we
5285 failed and the caller should emit a normal call. */
5287 static rtx
5289 {
5290 rtx op0;
5291 rtx result;
5294 HOST_WIDE_INT max_size;
5297 bool valid_arglist
5300 VOID_TYPE)
5311 || (!alloca_for_var
5314 ))
5315 {
5316 /* -Walloca-larger-than and -Wvla-larger-than settings of
5317 less than HOST_WIDE_INT_MAX override the more general
5318 -Walloc-size-larger-than so unless either of the former
5319 options is smaller than the last one (wchich would imply
5320 that the call was already checked), check the alloca
5321 arguments for overflow. */
5325 }
5327 /* Compute the argument. */
5330 /* Compute the alignment. */
5332 ? BIGGEST_ALIGNMENT
5335 /* Compute the maximum size. */
5340 /* Allocate the desired space. If the allocation stems from the declaration
5341 of a variable-sized object, it cannot accumulate. */
5342 result
5347 }
5349 /* Emit a call to __asan_allocas_unpoison call in EXP. Add to second argument
5350 of the call virtual_stack_dynamic_rtx - stack_pointer_rtx, which is the
5351 STACK_DYNAMIC_OFFSET value. See motivation for this in comment to
5352 handle_builtin_stack_restore function. */
5354 static rtx
5356 {
5363 OPTAB_LIB_WIDEN);
5366 OPTAB_LIB_WIDEN);
5371 }
5373 /* Expand a call to bswap builtin in EXP.
5374 Return NULL_RTX if a normal call should be emitted rather than expanding the
5375 function in-line. If convenient, the result should be placed in TARGET.
5376 SUBTARGET may be used as the target for computing one of EXP's operands. */
5378 static rtx
5380 rtx subtarget)
5381 {
5382 tree arg;
5383 rtx op0;
5401 }
5403 /* Expand a call to a unary builtin in EXP.
5404 Return NULL_RTX if a normal call should be emitted rather than expanding the
5405 function in-line. If convenient, the result should be placed in TARGET.
5406 SUBTARGET may be used as the target for computing one of EXP's operands. */
5408 static rtx
5411 {
5412 rtx op0;
5417 /* Compute the argument. */
5419 (subtarget
5423 /* Compute op, into TARGET if possible.
5424 Set TARGET to wherever the result comes back. */
5430 }
5432 /* Expand a call to __builtin_expect. We just return our argument
5433 as the builtin_expect semantic should've been already executed by
5434 tree branch prediction pass. */
5436 static rtx
5438 {
5439 tree arg;
5446 /* When guessing was done, the hints should be already stripped away. */
5450 }
5452 /* Expand a call to __builtin_expect_with_probability. We just return our
5453 argument as the builtin_expect semantic should've been already executed by
5454 tree branch prediction pass. */
5456 static rtx
5458 {
5459 tree arg;
5466 /* When guessing was done, the hints should be already stripped away. */
5470 }
5473 /* Expand a call to __builtin_assume_aligned. We just return our first
5474 argument as the builtin_assume_aligned semantic should've been already
5475 executed by CCP. */
5477 static rtx
5479 {
5483 EXPAND_NORMAL);
5488 }
5490 void
5492 {
5494 {
5496 /* For trap insns when not accumulating outgoing args force
5497 REG_ARGS_SIZE note to prevent crossjumping of calls with
5498 different args sizes. */
5501 }
5502 else
5503 {
5507 }
5510 }
5512 /* Expand a call to __builtin_unreachable. We do nothing except emit
5513 a barrier saying that control flow will not pass here.
5515 It is the responsibility of the program being compiled to ensure
5516 that control flow does never reach __builtin_unreachable. */
5517 static void
5519 {
5521 }
5523 /* Expand EXP, a call to fabs, fabsf or fabsl.
5524 Return NULL_RTX if a normal call should be emitted rather than expanding
5525 the function inline. If convenient, the result should be placed
5526 in TARGET. SUBTARGET may be used as the target for computing
5527 the operand. */
5529 static rtx
5531 {
5532 machine_mode mode;
5533 tree arg;
5534 rtx op0;
5544 }
5546 /* Expand EXP, a call to copysign, copysignf, or copysignl.
5547 Return NULL is a normal call should be emitted rather than expanding the
5548 function inline. If convenient, the result should be placed in TARGET.
5549 SUBTARGET may be used as the target for computing the operand. */
5551 static rtx
5553 {
5555 tree arg;
5567 }
5569 /* Expand a call to __builtin___clear_cache. */
5571 static rtx
5573 {
5575 {
5576 #ifdef CLEAR_INSN_CACHE
5577 /* There is no "clear_cache" insn, and __clear_cache() in libgcc
5578 does something. Just do the default expansion to a call to
5579 __clear_cache(). */
5581 #else
5582 /* There is no "clear_cache" insn, and __clear_cache() in libgcc
5583 does nothing. There is no need to call it. Do nothing. */
5586 }
5588 /* We have a "clear_cache" insn, and it will handle everything. */
5592 /* We must not expand to a library call. If we did, any
5593 fallback library function in libgcc that might contain a call to
5594 __builtin___clear_cache() would recurse infinitely. */
5596 {
5599 }
5602 {
5615 }
5617 }
5619 /* Given a trampoline address, make sure it satisfies TRAMPOLINE_ALIGNMENT. */
5621 static rtx
5623 {
5626 /* If we don't need too much alignment, we'll have been guaranteed
5627 proper alignment by get_trampoline_type. */
5631 /* Round address up to desired boundary. */
5642 }
5644 static rtx
5646 {
5662 /* If ONSTACK, the TRAMP argument should be the address of a field
5663 within the local function's FRAME decl. Either way, let's see if
5664 we can fill in the MEM_ATTRs for this memory. */
5668 /* Creator of a heap trampoline is responsible for making sure the
5669 address is aligned to at least STACK_BOUNDARY. Normally malloc
5670 will ensure this anyhow. */
5673 {
5677 }
5679 /* The FUNC argument should be the address of the nested function.
5680 Extract the actual function decl to pass to the hook. */
5687 /* Generate insns to initialize the trampoline. */
5691 {
5697 }
5700 }
5702 static rtx
5704 {
5705 rtx tramp;
5716 }
5718 /* Expand a call to the builtin descriptor initialization routine.
5719 A descriptor is made up of a couple of pointers to the static
5720 chain and the code entry in this order. */
5722 static rtx
5724 {
5729 VOID_TYPE))
5743 /* Generate insns to initialize the descriptor. */
5749 }
5751 /* Expand a call to the builtin descriptor adjustment routine. */
5753 static rtx
5755 {
5756 rtx tramp;
5763 /* Unalign the descriptor to allow runtime identification. */
5768 }
5770 /* Expand the call EXP to the built-in signbit, signbitf or signbitl
5771 function. The function first checks whether the back end provides
5772 an insn to implement signbit for the respective mode. If not, it
5773 checks whether the floating point format of the value is such that
5774 the sign bit can be extracted. If that is not the case, error out.
5775 EXP is the expression that is a call to the builtin function; if
5776 convenient, the result should be placed in TARGET. */
5777 static rtx
5779 {
5781 scalar_float_mode fmode;
5783 tree arg;
5786 rtx temp;
5799 /* Expand the argument yielding a RTX expression. */
5802 /* Check if the back end provides an insn that handles signbit for the
5803 argument's mode. */
5806 {
5812 }
5814 /* For floating point formats without a sign bit, implement signbit
5815 as "ARG < 0.0". */
5818 {
5819 /* But we can't do this if the format supports signed zero. */
5825 }
5828 {
5831 }
5832 else
5833 {
5835 /* Handle targets with different FP word orders. */
5838 else
5842 }
5844 /* Force the intermediate word_mode (or narrower) result into a
5845 register. This avoids attempting to create paradoxical SUBREGs
5846 of floating point modes below. */
5849 /* If the bitpos is within the "result mode" lowpart, the operation
5850 can be implement with a single bitwise AND. Otherwise, we need
5851 a right shift and an AND. */
5854 {
5862 }
5863 else
5864 {
5865 /* Perform a logical right shift to place the signbit in the least
5866 significant bit, then truncate the result to the desired mode
5867 and mask just this bit. */
5872 }
5875 }
5877 /* Expand fork or exec calls. TARGET is the desired target of the
5878 call. EXP is the call. FN is the
5879 identificator of the actual function. IGNORE is nonzero if the
5880 value is to be ignored. */
5882 static rtx
5884 {
5886 tree call;
5888 /* If we are not profiling, just call the function. */
5892 /* Otherwise call the wrapper. This should be equivalent for the rest of
5893 compiler, so the code does not diverge, and the wrapper may run the
5894 code necessary for keeping the profiling sane. */
5897 {
5928 }
5940 }
5943 \f
5944 /* Reconstitute a mode for a __sync intrinsic operation. Since the type of
5945 the pointer in these functions is void*, the tree optimizers may remove
5946 casts. The mode computed in expand_builtin isn't reliable either, due
5947 to __sync_bool_compare_and_swap.
5949 FCODE_DIFF should be fcode - base, where base is the FOO_1 code for the
5950 group of builtins. This gives us log2 of the mode size. */
5954 {
5955 /* The size is not negotiable, so ask not to get BLKmode in return
5956 if the target indicates that a smaller size would be better. */
5958 }
5960 /* Expand the memory expression LOC and return the appropriate memory operand
5961 for the builtin_sync operations. */
5963 static rtx
5965 {
5975 /* Note that we explicitly do not want any alias information for this
5976 memory, so that we kill all other live memories. Otherwise we don't
5977 satisfy the full barrier semantics of the intrinsic. */
5984 /* The alignment needs to be at least according to that of the mode. */
5991 }
5993 /* Make sure an argument is in the right mode.
5994 EXP is the tree argument.
5995 MODE is the mode it should be in. */
5997 static rtx
5999 {
6000 rtx val;
6001 machine_mode old_mode;
6004 /* If VAL is promoted to a wider mode, convert it back to MODE. Take care
6005 of CONST_INTs, where we know the old_mode only from the call argument. */
6012 }
6015 /* Expand the __sync_xxx_and_fetch and __sync_fetch_and_xxx intrinsics.
6016 EXP is the CALL_EXPR. CODE is the rtx code
6017 that corresponds to the arithmetic or logical operation from the name;
6018 an exception here is that NOT actually means NAND. TARGET is an optional
6019 place for us to store the results; AFTER is true if this is the
6020 fetch_and_xxx form. */
6022 static rtx
6025 rtx target)
6026 {
6031 {
6038 {
6067 }
6068 }
6070 /* Expand the operands. */
6075 after);
6076 }
6078 /* Expand the __sync_val_compare_and_swap and __sync_bool_compare_and_swap
6079 intrinsics. EXP is the CALL_EXPR. IS_BOOL is
6080 true if this is the boolean form. TARGET is a place for us to store the
6081 results; this is NOT optional if IS_BOOL is true. */
6083 static rtx
6086 {
6090 /* Expand the operands. */
6097 {
6100 else
6102 }
6105 MEMMODEL_SYNC_SEQ_CST))
6109 }
6111 /* Expand the __sync_lock_test_and_set intrinsic. Note that the most
6112 general form is actually an atomic exchange, and some targets only
6113 support a reduced form with the second argument being a constant 1.
6114 EXP is the CALL_EXPR; TARGET is an optional place for us to store
6115 the results. */
6117 static rtx
6119 rtx target)
6120 {
6123 /* Expand the operands. */
6128 }
6130 /* Expand the __sync_lock_release intrinsic. EXP is the CALL_EXPR. */
6132 static void
6134 {
6135 rtx mem;
6137 /* Expand the operands. */
6141 }
6143 /* Given an integer representing an ``enum memmodel'', verify its
6144 correctness and return the memory model enum. */
6146 static enum memmodel
6148 {
6149 rtx op;
6151 source_location loc
6154 /* If the parameter is not a constant, it's a run time value so we'll just
6155 convert it to MEMMODEL_SEQ_CST to avoid annoying runtime checking. */
6165 {
6169 }
6171 /* Should never see a user explicit SYNC memodel model, so >= LAST works. */
6173 {
6177 }
6179 /* Workaround for Bugzilla 59448. GCC doesn't track consume properly, so
6180 be conservative and promote consume to acquire. */
6185 }
6187 /* Expand the __atomic_exchange intrinsic:
6188 TYPE __atomic_exchange (TYPE *object, TYPE desired, enum memmodel)
6189 EXP is the CALL_EXPR.
6190 TARGET is an optional place for us to store the results. */
6192 static rtx
6194 {
6203 /* Expand the operands. */
6208 }
6210 /* Expand the __atomic_compare_exchange intrinsic:
6211 bool __atomic_compare_exchange (TYPE *object, TYPE *expect,
6212 TYPE desired, BOOL weak,
6213 enum memmodel success,
6214 enum memmodel failure)
6215 EXP is the CALL_EXPR.
6216 TARGET is an optional place for us to store the results. */
6218 static rtx
6220 rtx target)
6221 {
6225 tree weak;
6227 source_location loc
6234 {
6236 "failure memory model cannot be stronger than success "
6239 }
6242 {
6244 "invalid failure memory model for "
6248 }
6254 /* Expand the operands. */
6270 /* Lest the rtl backend create a race condition with an imporoper store
6271 to memory, always create a new pseudo for OLDVAL. */
6278 /* Conditionally store back to EXPECT, lest we create a race condition
6279 with an improper store to memory. */
6280 /* ??? With a rearrangement of atomics at the gimple level, we can handle
6281 the normal case where EXPECT is totally private, i.e. a register. At
6282 which point the store can be unconditional. */
6290 }
6292 /* Helper function for expand_ifn_atomic_compare_exchange - expand
6293 internal ATOMIC_COMPARE_EXCHANGE call into __atomic_compare_exchange_N
6294 call. The weak parameter must be dropped to match the expected parameter
6295 list and the expected argument changed from value to pointer to memory
6296 slot. */
6298 static void
6300 {
6316 /* Skip the boolean weak parameter. */
6319 /* At present we only have BUILT_IN_ATOMIC_COMPARE_EXCHANGE_{1,2,4,8,16}. */
6322 built_in_function fncode
6327 fndecl);
6332 {
6339 }
6340 }
6342 /* Expand IFN_ATOMIC_COMPARE_EXCHANGE internal function. */
6344 void
6346 {
6352 tree lhs;
6354 source_location loc
6361 {
6363 "failure memory model cannot be stronger than success "
6366 }
6369 {
6371 "invalid failure memory model for "
6375 }
6378 {
6381 }
6383 /* Expand the operands. */
6396 {
6399 }
6403 {
6409 }
6410 }
6412 /* Expand the __atomic_load intrinsic:
6413 TYPE __atomic_load (TYPE *object, enum memmodel)
6414 EXP is the CALL_EXPR.
6415 TARGET is an optional place for us to store the results. */
6417 static rtx
6419 {
6420 rtx mem;
6425 {
6426 source_location loc
6431 }
6436 /* Expand the operand. */
6440 }
6443 /* Expand the __atomic_store intrinsic:
6444 void __atomic_store (TYPE *object, TYPE desired, enum memmodel)
6445 EXP is the CALL_EXPR.
6446 TARGET is an optional place for us to store the results. */
6448 static rtx
6450 {
6457 {
6458 source_location loc
6463 }
6468 /* Expand the operands. */
6473 }
6475 /* Expand the __atomic_fetch_XXX intrinsic:
6476 TYPE __atomic_fetch_XXX (TYPE *object, TYPE val, enum memmodel)
6477 EXP is the CALL_EXPR.
6478 TARGET is an optional place for us to store the results.
6479 CODE is the operation, PLUS, MINUS, ADD, XOR, or IOR.
6480 FETCH_AFTER is true if returning the result of the operation.
6481 FETCH_AFTER is false if returning the value before the operation.
6482 IGNORE is true if the result is not used.
6483 EXT_CALL is the correct builtin for an external call if this cannot be
6484 resolved to an instruction sequence. */
6486 static rtx
6490 {
6493 tree fndecl;
6494 tree addr;
6498 /* Expand the operands. */
6502 /* Only try generating instructions if inlining is turned on. */
6504 {
6508 }
6510 /* Return if a different routine isn't needed for the library call. */
6514 /* Change the call to the specified function. */
6522 /* If we will emit code after the call, the call can not be a tail call.
6523 If it is emitted as a tail call, a barrier is emitted after it, and
6524 then all trailing code is removed. */
6528 /* Expand the call here so we can emit trailing code. */
6531 /* Replace the original function just in case it matters. */
6534 /* Then issue the arithmetic correction to return the right result. */
6536 {
6538 {
6540 OPTAB_LIB_WIDEN);
6542 }
6543 else
6545 OPTAB_LIB_WIDEN);
6546 }
6548 }
6550 /* Expand IFN_ATOMIC_BIT_TEST_AND_* internal function. */
6552 void
6554 {
6562 optab optab;
6574 {
6589 }
6592 {
6599 }
6621 {
6626 }
6627 else
6629 OPTAB_DIRECT);
6632 }
6634 /* Expand an atomic clear operation.
6635 void _atomic_clear (BOOL *obj, enum memmodel)
6636 EXP is the call expression. */
6638 static rtx
6640 {
6641 machine_mode mode;
6650 {
6651 source_location loc
6656 }
6658 /* Try issuing an __atomic_store, and allow fallback to __sync_lock_release.
6659 Failing that, a store is issued by __atomic_store. The only way this can
6660 fail is if the bool type is larger than a word size. Unlikely, but
6661 handle it anyway for completeness. Assume a single threaded model since
6662 there is no atomic support in this case, and no barriers are required. */
6667 }
6669 /* Expand an atomic test_and_set operation.
6670 bool _atomic_test_and_set (BOOL *obj, enum memmodel)
6671 EXP is the call expression. */
6673 static rtx
6675 {
6676 rtx mem;
6678 machine_mode mode;
6685 }
6688 /* Return true if (optional) argument ARG1 of size ARG0 is always lock free on
6689 this architecture. If ARG1 is NULL, use typical alignment for size ARG0. */
6691 static tree
6693 {
6695 machine_mode mode;
6701 /* We need a corresponding integer mode for the access to be lock-free. */
6709 {
6712 /* Either this argument is null, or it's a fake pointer encoding
6713 the alignment of the object. */
6719 else
6721 }
6722 else
6723 {
6726 /* This function is usually invoked and folded immediately by the front
6727 end before anything else has a chance to look at it. The pointer
6728 parameter at this point is usually cast to a void *, so check for that
6729 and look past the cast. */
6739 /* Get the underlying type of the object. */
6742 }
6744 /* If the object has smaller alignment, the lock free routines cannot
6745 be used. */
6749 /* Check if a compare_and_swap pattern exists for the mode which represents
6750 the required size. The pattern is not allowed to fail, so the existence
6751 of the pattern indicates support is present. Also require that an
6752 atomic load exists for the required size. */
6755 else
6757 }
6759 /* Return true if the parameters to call EXP represent an object which will
6760 always generate lock free instructions. The first argument represents the
6761 size of the object, and the second parameter is a pointer to the object
6762 itself. If NULL is passed for the object, then the result is based on
6763 typical alignment for an object of the specified size. Otherwise return
6764 false. */
6766 static rtx
6768 {
6769 tree size;
6774 {
6777 }
6783 }
6785 /* Return a one or zero if it can be determined that object ARG1 of size ARG
6786 is lock free on this architecture. */
6788 static tree
6790 {
6794 /* If it isn't always lock free, don't generate a result. */
6799 }
6801 /* Return true if the parameters to call EXP represent an object which will
6802 always generate lock free instructions. The first argument represents the
6803 size of the object, and the second parameter is a pointer to the object
6804 itself. If NULL is passed for the object, then the result is based on
6805 typical alignment for an object of the specified size. Otherwise return
6806 NULL*/
6808 static rtx
6810 {
6811 tree size;
6816 {
6819 }
6824 /* If the value is known at compile time, return the RTX for it. */
6830 }
6832 /* Expand the __atomic_thread_fence intrinsic:
6833 void __atomic_thread_fence (enum memmodel)
6834 EXP is the CALL_EXPR. */
6836 static void
6838 {
6841 }
6843 /* Expand the __atomic_signal_fence intrinsic:
6844 void __atomic_signal_fence (enum memmodel)
6845 EXP is the CALL_EXPR. */
6847 static void
6849 {
6852 }
6854 /* Expand the __sync_synchronize intrinsic. */
6856 static void
6858 {
6860 }
6862 static rtx
6864 {
6870 {
6872 /* If the target is not sutitable then create a new target. */
6880 }
6883 }
6885 static void
6887 {
6893 {
6900 }
6902 }
6904 \f
6905 /* Emit code to restore the current value of stack. */
6907 static void
6909 {
6921 }
6923 /* Emit code to save the current value of stack. */
6925 static rtx
6927 {
6932 }
6934 /* Emit code to get the openacc gang, worker or vector id or size. */
6936 static rtx
6938 {
6940 rtx fallback_retval;
6943 {
6956 }
6959 {
6962 }
6966 {
6969 }
6973 {
6981 }
6990 {
6993 }
7001 }
7003 /* Expand a string compare operation using a sequence of char comparison
7004 to get rid of the calling overhead, with result going to TARGET if
7005 that's convenient.
7007 VAR_STR is the variable string source;
7008 CONST_STR is the constant string source;
7009 LENGTH is the number of chars to compare;
7010 CONST_STR_N indicates which source string is the constant string;
7011 IS_MEMCMP indicates whether it's a memcmp or strcmp.
7013 to: (assume const_str_n is 2, i.e., arg2 is a constant string)
7015 target = (int) (unsigned char) var_str[0]
7016 - (int) (unsigned char) const_str[0];
7017 if (target != 0)
7018 goto ne_label;
7019 ...
7020 target = (int) (unsigned char) var_str[length - 2]
7021 - (int) (unsigned char) const_str[length - 2];
7022 if (target != 0)
7023 goto ne_label;
7024 target = (int) (unsigned char) var_str[length - 1]
7025 - (int) (unsigned char) const_str[length - 1];
7026 ne_label:
7027 */
7029 static rtx
7033 {
7035 rtx var_rtx_array
7042 scalar_int_mode unit_mode
7048 {
7049 var_rtx
7063 }
7071 }
7073 /* Inline expansion a call to str(n)cmp, with result going to
7074 TARGET if that's convenient.
7075 If the call is not been inlined, return NULL_RTX. */
7076 static rtx
7078 {
7084 /* Do NOT apply this inlining expansion when optimizing for size or
7085 optimization level below 2. */
7093 /* On a target where the type of the call (int) has same or narrower presicion
7094 than unsigned char, give up the inlining expansion. */
7110 /* If neither strings is constant string, the call is not qualify. */
7114 /* For strncmp, if the length is not a const, not qualify. */
7125 else
7134 /* If the length of the comparision is larger than the threshold,
7135 do nothing. */
7142 /* Now, start inline expansion the call. */
7146 }
7148 /* Expand a call to __builtin_speculation_safe_value_<N>. MODE
7149 represents the size of the first argument to that call, or VOIDmode
7150 if the argument is a pointer. IGNORE will be true if the result
7151 isn't used. */
7152 static rtx
7155 {
7162 {
7165 }
7169 /* An optional second argument can be used as a failsafe value on
7170 some machines. If it isn't present, then the failsafe value is
7171 assumed to be 0. */
7173 {
7176 }
7177 else
7180 /* If the result isn't used, the behavior is undefined. It would be
7181 nice to emit a warning here, but path splitting means this might
7182 happen with legitimate code. So simply drop the builtin
7183 expansion in that case; we've handled any side-effects above. */
7187 /* If we don't have a suitable target, create one to hold the result. */
7195 }
7197 /* Expand an expression EXP that calls a built-in function,
7198 with result going to TARGET if that's convenient
7199 (and in mode MODE if that's convenient).
7200 SUBTARGET may be used as the target for computing one of EXP's operands.
7201 IGNORE is nonzero if the value is to be ignored. */
7203 rtx
7206 {
7215 /* When ASan is enabled, we don't want to expand some memory/string
7216 builtins and rely on libsanitizer's hooks. This allows us to avoid
7217 redundant checks and be sure, that possible overflow will be detected
7218 by ASan. */
7223 /* When not optimizing, generate calls to library functions for a certain
7224 set of builtins. */
7238 /* The built-in function expanders test for target == const0_rtx
7239 to determine whether the function's result will be ignored. */
7243 /* If the result of a pure or const built-in function is ignored, and
7244 none of its arguments are volatile, we can avoid expanding the
7245 built-in call and just evaluate the arguments for side-effects. */
7249 {
7251 tree arg;
7252 call_expr_arg_iterator iter;
7256 {
7259 }
7262 {
7266 }
7267 }
7270 {
7288 /* Just do a normal library call if we were unable to fold
7289 the values. */
7366 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
7367 FUNCTION with a copy of the parameters described by
7368 ARGUMENTS, and ARGSIZE. It returns a block of memory
7369 allocated on the stack into which is stored all the registers
7370 that might possibly be used for returning the result of a
7371 function. ARGUMENTS is the value returned by
7372 __builtin_apply_args. ARGSIZE is the number of bytes of
7373 arguments that must be copied. ??? How should this value be
7374 computed? We'll also need a safe worst case value for varargs
7375 functions. */
7382 else
7383 {
7391 }
7393 /* __builtin_return (RESULT) causes the function to return the
7394 value described by RESULT. RESULT is address of the block of
7395 memory returned by __builtin_apply. */
7405 /* All valid uses of __builtin_va_arg_pack () are removed during
7406 inlining. */
7411 /* All valid uses of __builtin_va_arg_pack_len () are removed during
7412 inlining. */
7416 /* Return the address of the first anonymous stack arg. */
7438 /* Returns the address of the area where the structure is returned.
7439 0 otherwise. */
7445 else
7448 CASE_BUILT_IN_ALLOCA:
7598 /* Expand it as BUILT_IN_MEMCMP_EQ first. If not successful, change it
7599 back to a BUILT_IN_STRCMP. Remember to delete the 3rd paramater
7600 when changing it to a strcmp call. */
7606 /* Change this call back to a BUILT_IN_STRCMP. */
7610 /* Delete the last parameter. */
7617 /* FALLTHROUGH */
7625 /* Expand it as BUILT_IN_MEMCMP_EQ first. If not successful, change it
7626 back to a BUILT_IN_STRNCMP. */
7632 /* Change it back to a BUILT_IN_STRNCMP. */
7635 /* FALLTHROUGH */
7650 {
7653 }
7657 /* This should have been lowered to the builtins below. */
7661 /* __builtin_setjmp_setup is passed a pointer to an array of five words
7662 and the receiver label. */
7664 {
7670 /* This is copied from the handling of non-local gotos. */
7672 nonlocal_goto_handler_labels
7674 nonlocal_goto_handler_labels);
7675 /* ??? Do not let expand_label treat us as such since we would
7676 not want to be both on the list of non-local labels and on
7677 the list of forced labels. */
7680 }
7684 /* __builtin_setjmp_receiver is passed the receiver label. */
7686 {
7692 }
7695 /* __builtin_longjmp is passed a pointer to an array of five words.
7696 It's similar to the C library longjmp function but works with
7697 __builtin_setjmp above. */
7700 {
7706 {
7709 }
7713 }
7722 /* This updates the setjmp buffer that is its argument with the value
7723 of the current stack pointer. */
7726 {
7727 rtx buf_addr
7732 }
7752 /* Various hooks for the DWARF 2 __throw routine. */
7758 #ifdef DWARF2_UNWIND_INFO
7764 #endif
7966 mode = get_builtin_sync_mode
7978 mode = get_builtin_sync_mode
8025 {
8029 mode =
8035 /* If this is turned into an external library call, the weak parameter
8036 must be dropped to match the expected parameter list. */
8041 /* Skip the boolean weak parameter. */
8046 }
8075 {
8085 }
8091 {
8101 }
8107 {
8117 }
8123 {
8133 }
8139 {
8149 }
8155 {
8165 }
8302 /* Do library call, if we failed to expand the builtin when
8303 folding. */
8323 }
8325 /* The switch statement above can drop through to cause the function
8326 to be called normally. */
8328 }
8330 /* Determine whether a tree node represents a call to a built-in
8331 function. If the tree T is a call to a built-in function with
8332 the right number of arguments of the appropriate types, return
8333 the DECL_FUNCTION_CODE of the call, e.g. BUILT_IN_SQRT.
8334 Otherwise the return value is END_BUILTINS. */
8336 enum built_in_function
8338 {
8341 const_call_expr_arg_iterator iter;
8353 {
8354 /* If a function doesn't take a variable number of arguments,
8355 the last element in the list will have type `void'. */
8358 {
8362 }
8371 {
8374 }
8376 {
8379 }
8381 {
8384 }
8386 {
8389 }
8390 else
8392 }
8394 /* Variable-length argument list. */
8396 }
8398 /* Fold a call to __builtin_constant_p, if we know its argument ARG will
8399 evaluate to a constant. */
8401 static tree
8403 {
8404 /* We return 1 for a numeric type that's known to be a constant
8405 value at compile-time or for an aggregate type that's a
8406 literal constant. */
8409 /* If we know this is a constant, emit the constant of one. */
8415 {
8422 }
8424 /* If this expression has side effects, show we don't know it to be a
8425 constant. Likewise if it's a pointer or aggregate type since in
8426 those case we only want literals, since those are only optimized
8427 when generating RTL, not later.
8428 And finally, if we are compiling an initializer, not code, we
8429 need to return a definite result now; there's not going to be any
8430 more optimization done. */
8435 || folding_initializer
8440 }
8442 /* Create builtin_expect or builtin_expect_with_probability
8443 with PRED and EXPECTED as its arguments and return it as a truthvalue.
8444 Fortran FE can also produce builtin_expect with PREDICTOR as third argument.
8445 builtin_expect_with_probability instead uses third argument as PROBABILITY
8446 value. */
8448 static tree
8451 {
8466 else
8468 predictor);
8472 }
8474 /* Fold a call to builtin_expect with arguments ARG0, ARG1, ARG2, ARG3. Return
8475 NULL_TREE if no simplification is possible. */
8477 tree
8479 tree arg3)
8480 {
8484 /* Distribute the expected value over short-circuiting operators.
8485 See through the cast from truthvalue_type_node to long. */
8492 /* If this is a builtin_expect within a builtin_expect keep the
8493 inner one. See through a comparison against a constant. It
8494 might have been added to create a thruthvalue. */
8510 {
8520 }
8522 /* If the argument isn't invariant then there's nothing else we can do. */
8526 /* If we expect that a comparison against the argument will fold to
8527 a constant return the constant. In practice, this means a true
8528 constant or the address of a non-weak symbol. */
8532 {
8533 do
8534 {
8536 }
8541 }
8543 /* Otherwise, ARG0 already has the proper type for the return value. */
8545 }
8547 /* Fold a call to __builtin_classify_type with argument ARG. */
8549 static tree
8551 {
8556 }
8558 /* Fold a call to __builtin_strlen with argument ARG. */
8560 static tree
8562 {
8565 else
8566 {
8567 c_strlen_data data;
8578 {
8584 }
8587 }
8588 }
8590 /* Fold a call to __builtin_inf or __builtin_huge_val. */
8592 static tree
8594 {
8595 REAL_VALUE_TYPE real;
8597 /* __builtin_inff is intended to be usable to define INFINITY on all
8598 targets. If an infinity is not available, INFINITY expands "to a
8599 positive constant of type float that overflows at translation
8600 time", footnote "In this case, using INFINITY will violate the
8601 constraint in 6.4.4 and thus require a diagnostic." (C99 7.12#4).
8602 Thus we pedwarn to ensure this constraint violation is
8603 diagnosed. */
8609 }
8611 /* Fold function call to builtin sincos, sincosf, or sincosl. Return
8612 NULL_TREE if no simplification can be made. */
8614 static tree
8617 {
8618 tree type;
8628 /* Calculate the result when the argument is a constant. */
8633 /* Canonicalize sincos to cexpi. */
8635 {
8638 }
8640 {
8647 }
8659 }
8661 /* Fold function call to builtin memcmp with arguments ARG1 and ARG2.
8662 Return NULL_TREE if no simplification can be made. */
8664 static tree
8666 {
8672 /* If the LEN parameter is zero, return zero. */
8677 /* If ARG1 and ARG2 are the same (and not volatile), return zero. */
8681 /* If len parameter is one, return an expression corresponding to
8682 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
8684 {
8686 tree cst_uchar_ptr_node
8689 tree ind1
8693 cst_uchar_ptr_node,
8694 arg1)));
8695 tree ind2
8699 cst_uchar_ptr_node,
8700 arg2)));
8702 }
8705 }
8707 /* Fold a call to builtin isascii with argument ARG. */
8709 static tree
8711 {
8714 else
8715 {
8716 /* Transform isascii(c) -> ((c & ~0x7f) == 0). */
8722 }
8723 }
8725 /* Fold a call to builtin toascii with argument ARG. */
8727 static tree
8729 {
8733 /* Transform toascii(c) -> (c & 0x7f). */
8736 }
8738 /* Fold a call to builtin isdigit with argument ARG. */
8740 static tree
8742 {
8745 else
8746 {
8747 /* Transform isdigit(c) -> (unsigned)(c) - '0' <= 9. */
8748 /* According to the C standard, isdigit is unaffected by locale.
8749 However, it definitely is affected by the target character set. */
8750 unsigned HOST_WIDE_INT target_digit0
8761 }
8762 }
8764 /* Fold a call to fabs, fabsf or fabsl with argument ARG. */
8766 static tree
8768 {
8774 }
8776 /* Fold a call to abs, labs, llabs or imaxabs with argument ARG. */
8778 static tree
8780 {
8786 }
8788 /* Fold a call to builtin carg(a+bi) -> atan2(b,a). */
8790 static tree
8792 {
8795 {
8799 {
8804 }
8805 }
8808 }
8810 /* Fold a call to builtin frexp, we can assume the base is 2. */
8812 static tree
8814 {
8825 /* Proceed if a valid pointer type was passed in. */
8827 {
8832 {
8834 /* For +-0, return (*exp = 0, +-0). */
8840 /* For +-NaN or +-Inf, *exp is unspecified, return arg0. */
8843 {
8844 /* Since the frexp function always expects base 2, and in
8845 GCC normalized significands are already in the range
8846 [0.5, 1.0), we have exactly what frexp wants. */
8851 }
8855 }
8857 /* Create the COMPOUND_EXPR (*arg1 = trunc, frac). */
8861 }
8864 }
8866 /* Fold a call to builtin modf. */
8868 static tree
8870 {
8881 /* Proceed if a valid pointer type was passed in. */
8883 {
8888 {
8891 /* For +-NaN or +-0, return (*arg1 = arg0, arg0). */
8895 /* For +-Inf, return (*arg1 = arg0, +-0). */
8901 /* Return (*arg1 = trunc(arg0), arg0-trunc(arg0)). */
8904 /* If the original number was negative and already
8905 integral, then the fractional part is -0.0. */
8909 }
8911 /* Create the COMPOUND_EXPR (*arg1 = trunc, frac). */
8917 }
8920 }
8922 /* Given a location LOC, an interclass builtin function decl FNDECL
8923 and its single argument ARG, return an folded expression computing
8924 the same, or NULL_TREE if we either couldn't or didn't want to fold
8925 (the latter happen if there's an RTL instruction available). */
8927 static tree
8929 {
8930 machine_mode mode;
8942 /* If there is no optab, try generic code. */
8944 {
8945 tree result;
8948 {
8949 /* isinf(x) -> isgreater(fabs(x),DBL_MAX). */
8952 REAL_VALUE_TYPE r;
8956 {
8957 /* NaN and Inf are encoded in the high-order double value
8958 only. The low-order value is not significant. */
8962 }
8969 }
8972 {
8973 /* isfinite(x) -> islessequal(fabs(x),DBL_MAX). */
8976 REAL_VALUE_TYPE r;
8980 {
8981 /* NaN and Inf are encoded in the high-order double value
8982 only. The low-order value is not significant. */
8986 }
8992 /*result = fold_build2_loc (loc, UNGT_EXPR,
8993 TREE_TYPE (TREE_TYPE (fndecl)),
8994 fold_build1_loc (loc, ABS_EXPR, type, arg),
8995 build_real (type, r));
8996 result = fold_build1_loc (loc, TRUTH_NOT_EXPR,
8997 TREE_TYPE (TREE_TYPE (fndecl)),
8998 result);*/
9000 }
9002 {
9003 /* isnormal(x) -> isgreaterequal(fabs(x),DBL_MIN) &
9004 islessequal(fabs(x),DBL_MAX). */
9014 {
9015 /* Use double to test the normal range of IBM extended
9016 precision. Emin for IBM extended precision is
9017 different to emin for IEEE double, being 53 higher
9018 since the low double exponent is at least 53 lower
9019 than the high double exponent. */
9023 }
9035 {
9036 /* Testing the high end of the range is done just using
9037 the high double, using the same test as isfinite().
9038 For the subnormal end of the range we first test the
9039 high double, then if its magnitude is equal to the
9040 limit of 0x1p-969, we test whether the low double is
9041 non-zero and opposite sign to the high double. */
9057 integer_type_node,
9063 }
9064 else
9065 {
9066 tree const isge_fn
9069 }
9073 }
9076 }
9079 }
9081 /* Fold a call to __builtin_isnan(), __builtin_isinf, __builtin_finite.
9082 ARG is the argument for the call. */
9084 static tree
9086 {
9093 {
9101 {
9102 /* isinf_sign(x) -> isinf(x) ? (signbit(x) ? -1 : 1) : 0 */
9103 /* In a boolean context, GCC will fold the inner COND_EXPR to
9104 1. So e.g. "if (isinf_sign(x))" would be folded to just
9105 "if (isinf(x) ? 1 : 0)" which becomes "if (isinf(x))". */
9113 {
9126 integer_zero_node);
9127 }
9130 }
9143 {
9146 {
9147 /* NaN and Inf are encoded in the high-order double value
9148 only. The low-order value is not significant. */
9150 }
9151 }
9157 }
9158 }
9160 /* Fold a call to __builtin_fpclassify(int, int, int, int, int, ...).
9161 This builtin will generate code to return the appropriate floating
9162 point classification depending on the value of the floating point
9163 number passed in. The possible return values must be supplied as
9164 int arguments to the call in the following order: FP_NAN, FP_INFINITE,
9165 FP_NORMAL, FP_SUBNORMAL and FP_ZERO. The ellipses is for exactly
9166 one floating point argument which is "type generic". */
9168 static tree
9170 {
9173 machine_mode mode;
9174 REAL_VALUE_TYPE r;
9177 /* Verify the required arguments in the original call. */
9197 /* fpclassify(x) ->
9198 isnan(x) ? FP_NAN :
9199 (fabs(x) == Inf ? FP_INFINITE :
9200 (fabs(x) >= DBL_MIN ? FP_NORMAL :
9201 (x == 0 ? FP_ZERO : FP_SUBNORMAL))). */
9215 {
9221 }
9224 {
9227 }
9230 }
9232 /* Fold a call to an unordered comparison function such as
9233 __builtin_isgreater(). FNDECL is the FUNCTION_DECL for the function
9234 being called and ARG0 and ARG1 are the arguments for the call.
9235 UNORDERED_CODE and ORDERED_CODE are comparison codes that give
9236 the opposite of the desired result. UNORDERED_CODE is used
9237 for modes that can hold NaNs and ORDERED_CODE is used for
9238 the rest. */
9240 static tree
9244 {
9258 /* Choose the wider of two real types. */
9270 {
9274 }
9279 }
9281 /* Fold __builtin_{,s,u}{add,sub,mul}{,l,ll}_overflow, either into normal
9282 arithmetics if it can never overflow, or into internal functions that
9283 return both result of arithmetics and overflowed boolean flag in
9284 a complex integer result, or some other check for overflow.
9285 Similarly fold __builtin_{add,sub,mul}_overflow_p to just the overflow
9286 checking part of that. */
9288 static tree
9291 {
9293 /* The code of the expression corresponding to the type-generic
9294 built-in, or ERROR_MARK for the type-specific ones. */
9299 {
9302 /* FALLTHRU */
9305 /* FALLTHRU */
9316 /* FALLTHRU */
9319 /* FALLTHRU */
9330 /* FALLTHRU */
9333 /* FALLTHRU */
9344 }
9346 /* For the "generic" overloads, the first two arguments can have different
9347 types and the last argument determines the target type to use to check
9348 for overflow. The arguments of the other overloads all have the same
9349 type. */
9352 /* For the __builtin_{add,sub,mul}_overflow_p builtins, when the first two
9353 arguments are constant, attempt to fold the built-in call into a constant
9354 expression indicating whether or not it detected an overflow. */
9358 /* Perform the computation in the target type and check for overflow. */
9362 arg2);
9376 tree store
9379 }
9381 /* Fold a call to __builtin_FILE to a constant string. */
9385 {
9387 {
9388 /* The documentation says this builtin is equivalent to the preprocessor
9389 __FILE__ macro so it appears appropriate to use the same file prefix
9390 mappings. */
9393 }
9396 }
9398 /* Fold a call to __builtin_FUNCTION to a constant string. */
9402 {
9409 }
9411 /* Fold a call to __builtin_LINE to an integer constant. */
9415 {
9417 }
9419 /* Fold a call to built-in function FNDECL with 0 arguments.
9420 This function returns NULL_TREE if no simplification was possible. */
9422 static tree
9424 {
9428 {
9454 }
9456 }
9458 /* Fold a call to built-in function FNDECL with 1 argument, ARG0.
9459 This function returns NULL_TREE if no simplification was possible. */
9461 static tree
9463 {
9474 {
9476 {
9479 /* Gimplification will pull the CALL_EXPR for the builtin out of
9480 an if condition. When not optimizing, we'll not CSE it back.
9481 To avoid link error types of regressions, return false now. */
9486 }
9542 {
9547 }
9553 {
9558 }
9579 }
9583 }
9585 /* Fold a call to built-in function FNDECL with 2 arguments, ARG0 and ARG1.
9586 This function returns NULL_TREE if no simplification was possible. */
9588 static tree
9590 {
9602 {
9646 NOP_EXPR);
9648 /* We do the folding for va_start in the expander. */
9663 }
9665 }
9667 /* Fold a call to built-in function FNDECL with 3 arguments, ARG0, ARG1,
9668 and ARG2.
9669 This function returns NULL_TREE if no simplification was possible. */
9671 static tree
9674 {
9688 {
9737 }
9739 }
9741 /* Fold a call to built-in function FNDECL. ARGS is an array of NARGS
9742 arguments. IGNORE is true if the result of the
9743 function call is ignored. This function returns NULL_TREE if no
9744 simplification was possible. */
9746 tree
9748 {
9752 {
9768 }
9770 {
9774 }
9776 }
9778 /* Construct a new CALL_EXPR to FNDECL using the tail of the argument
9779 list ARGS along with N new arguments in NEWARGS. SKIP is the number
9780 of arguments in ARGS to be omitted. OLDNARGS is the number of
9781 elements in ARGS. */
9783 static tree
9786 {
9791 {
9799 }
9800 else
9804 }
9806 /* Return true if FNDECL shouldn't be folded right now.
9807 If a built-in function has an inline attribute always_inline
9808 wrapper, defer folding it after always_inline functions have
9809 been inlined, otherwise e.g. -D_FORTIFY_SOURCE checking
9810 might not be performed. */
9812 bool
9814 {
9817 && cfun
9820 }
9822 /* A wrapper function for builtin folding that prevents warnings for
9823 "statement without effect" and the like, caused by removing the
9824 call node earlier than the warning is generated. */
9826 tree
9828 {
9832 /* If CALL_EXPR_VA_ARG_PACK is set, the arguments aren't finalized
9833 yet. Defer folding until we see all the arguments
9834 (after inlining). */
9836 {
9839 /* Before gimplification CALL_EXPR_VA_ARG_PACK is not set, but
9840 instead last argument is __builtin_va_arg_pack (). Defer folding
9841 even in that case, until arguments are finalized. */
9843 {
9847 }
9855 else
9856 {
9861 }
9862 }
9864 }
9866 /* Fold a CALL_EXPR with type TYPE with FN as the function expression.
9867 N arguments are passed in the array ARGARRAY. Return a folded
9868 expression or NULL_TREE if no simplification was possible. */
9870 tree
9872 tree fn,
9875 {
9882 {
9883 /* If last argument is __builtin_va_arg_pack (), arguments to this
9884 function are not finalized yet. Defer folding until they are. */
9886 {
9890 }
9895 else
9897 }
9900 }
9902 /* Construct a new CALL_EXPR using the tail of the argument list of EXP
9903 along with N new arguments specified as the "..." parameters. SKIP
9904 is the number of arguments in EXP to be omitted. This function is used
9905 to do varargs-to-varargs transformations. */
9907 static tree
9909 {
9911 tree t;
9919 }
9921 /* Validate a single argument ARG against a tree code CODE representing
9922 a type. Return true when argument is valid. */
9924 static bool
9926 {
9934 }
9936 /* This function validates the types of a function call argument list
9937 against a specified list of tree_codes. If the last specifier is a 0,
9938 that represents an ellipses, otherwise the last specifier must be a
9939 VOID_TYPE.
9941 This is the GIMPLE version of validate_arglist. Eventually we want to
9942 completely convert builtins.c to work from GIMPLEs and the tree based
9943 validate_arglist will then be removed. */
9945 bool
9947 {
9951 const_tree arg;
9957 do
9958 {
9961 {
9963 /* This signifies an ellipses, any further arguments are all ok. */
9967 /* This signifies an endlink, if no arguments remain, return
9968 true, otherwise return false. */
9972 /* If no parameters remain or the parameter's code does not
9973 match the specified code, return false. Otherwise continue
9974 checking any remaining arguments. */
9979 }
9980 }
9983 /* We need gotos here since we can only have one VA_CLOSE in a
9984 function. */
9985 end: ;
9989 }
9991 /* Default target-specific builtin expander that does nothing. */
9993 rtx
9995 rtx target ATTRIBUTE_UNUSED,
9996 rtx subtarget ATTRIBUTE_UNUSED,
9997 machine_mode mode ATTRIBUTE_UNUSED,
9999 {
10001 }
10003 /* Returns true is EXP represents data that would potentially reside
10004 in a readonly section. */
10006 bool
10008 {
10018 /* Make sure we call decl_readonly_section only for trees it
10019 can handle (since it returns true for everything it doesn't
10020 understand). */
10025 else
10027 }
10029 /* Simplify a call to the strpbrk builtin. S1 and S2 are the arguments
10030 to the call, and TYPE is its return type.
10032 Return NULL_TREE if no simplification was possible, otherwise return the
10033 simplified form of the call as a tree.
10035 The simplified form may be a constant or other expression which
10036 computes the same value, but in a more efficient manner (including
10037 calls to other builtin functions).
10039 The call may contain arguments which need to be evaluated, but
10040 which are not useful to determine the result of the call. In
10041 this case we return a chain of COMPOUND_EXPRs. The LHS of each
10042 COMPOUND_EXPR will be an argument which must be evaluated.
10043 COMPOUND_EXPRs are chained through their RHS. The RHS of the last
10044 COMPOUND_EXPR in the chain will contain the tree for the simplified
10045 form of the builtin function call. */
10047 static tree
10049 {
10053 else
10054 {
10055 tree fn;
10064 {
10066 tree tem;
10071 /* Return an offset into the constant string argument. */
10074 }
10077 /* strpbrk(x, "") == NULL.
10078 Evaluate and ignore s1 in case it had side-effects. */
10088 /* New argument list transforming strpbrk(s1, s2) to
10089 strchr(s1, s2[0]). */
10092 }
10093 }
10095 /* Simplify a call to the strspn builtin. S1 and S2 are the arguments
10096 to the call.
10098 Return NULL_TREE if no simplification was possible, otherwise return the
10099 simplified form of the call as a tree.
10101 The simplified form may be a constant or other expression which
10102 computes the same value, but in a more efficient manner (including
10103 calls to other builtin functions).
10105 The call may contain arguments which need to be evaluated, but
10106 which are not useful to determine the result of the call. In
10107 this case we return a chain of COMPOUND_EXPRs. The LHS of each
10108 COMPOUND_EXPR will be an argument which must be evaluated.
10109 COMPOUND_EXPRs are chained through their RHS. The RHS of the last
10110 COMPOUND_EXPR in the chain will contain the tree for the simplified
10111 form of the builtin function call. */
10113 static tree
10115 {
10119 else
10120 {
10123 /* If either argument is "", return NULL_TREE. */
10125 /* Evaluate and ignore both arguments in case either one has
10126 side-effects. */
10130 }
10131 }
10133 /* Simplify a call to the strcspn builtin. S1 and S2 are the arguments
10134 to the call.
10136 Return NULL_TREE if no simplification was possible, otherwise return the
10137 simplified form of the call as a tree.
10139 The simplified form may be a constant or other expression which
10140 computes the same value, but in a more efficient manner (including
10141 calls to other builtin functions).
10143 The call may contain arguments which need to be evaluated, but
10144 which are not useful to determine the result of the call. In
10145 this case we return a chain of COMPOUND_EXPRs. The LHS of each
10146 COMPOUND_EXPR will be an argument which must be evaluated.
10147 COMPOUND_EXPRs are chained through their RHS. The RHS of the last
10148 COMPOUND_EXPR in the chain will contain the tree for the simplified
10149 form of the builtin function call. */
10151 static tree
10153 {
10157 else
10158 {
10159 /* If the first argument is "", return NULL_TREE. */
10162 {
10163 /* Evaluate and ignore argument s2 in case it has
10164 side-effects. */
10167 }
10169 /* If the second argument is "", return __builtin_strlen(s1). */
10172 {
10175 /* If the replacement _DECL isn't initialized, don't do the
10176 transformation. */
10181 }
10183 }
10184 }
10186 /* Fold the next_arg or va_start call EXP. Returns true if there was an error
10187 produced. False otherwise. This is done so that we don't output the error
10188 or warning twice or three times. */
10190 bool
10192 {
10195 tree arg;
10196 /* There is good chance the current input_location points inside the
10197 definition of the va_start macro (perhaps on the token for
10198 builtin) in a system header, so warnings will not be emitted.
10199 Use the location in real source code. */
10200 source_location current_location =
10202 NULL);
10205 {
10208 }
10211 {
10213 {
10216 }
10218 }
10219 /* We use __builtin_va_start (ap, 0, 0) or __builtin_next_arg (0, 0)
10220 when we checked the arguments and if needed issued a warning. */
10221 else
10222 {
10224 {
10225 /* Evidently an out of date version of <stdarg.h>; can't validate
10226 va_start's second argument, but can still work as intended. */
10228 OPT_Wvarargs,
10231 }
10233 {
10236 }
10238 }
10243 /* We destructively modify the call to be __builtin_va_start (ap, 0)
10244 or __builtin_next_arg (0) the first time we see it, after checking
10245 the arguments and if needed issuing a warning. */
10247 {
10250 /* Strip off all nops for the sake of the comparison. This
10251 is not quite the same as STRIP_NOPS. It does more.
10252 We must also strip off INDIRECT_EXPR for C++ reference
10253 parameters. */
10258 {
10259 /* FIXME: Sometimes with the tree optimizers we can get the
10260 not the last argument even though the user used the last
10261 argument. We just warn and set the arg to be the last
10262 argument so that we will get wrong-code because of
10263 it. */
10265 OPT_Wvarargs,
10267 }
10269 /* Undefined by C99 7.15.1.4p4 (va_start):
10270 "If the parameter parmN is declared with the register storage
10271 class, with a function or array type, or with a type that is
10272 not compatible with the type that results after application of
10273 the default argument promotions, the behavior is undefined."
10274 */
10276 {
10278 OPT_Wvarargs,
10279 "undefined behavior when second parameter of "
10281 }
10283 /* We want to verify the second parameter just once before the tree
10284 optimizers are run and then avoid keeping it in the tree,
10285 as otherwise we could warn even for correct code like:
10286 void foo (int i, ...)
10287 { va_list ap; i++; va_start (ap, i); va_end (ap); } */
10290 else
10292 }
10294 }
10297 /* Expand a call EXP to __builtin_object_size. */
10299 static rtx
10301 {
10302 tree ost;
10307 {
10312 }
10320 {
10325 }
10330 }
10332 /* Expand EXP, a call to the __mem{cpy,pcpy,move,set}_chk builtin.
10333 FCODE is the BUILT_IN_* to use.
10334 Return NULL_RTX if we failed; the caller should emit a normal call,
10335 otherwise try to get the result in TARGET, if convenient (and in
10336 mode MODE if that's convenient). */
10338 static rtx
10341 {
10343 POINTER_TYPE,
10344 fcode == BUILT_IN_MEMSET_CHK
10361 {
10362 /* Avoid transforming the checking call to an ordinary one when
10363 an overflow has been detected or when the call couldn't be
10364 validated because the size is not constant. */
10369 /* If __builtin_mem{cpy,pcpy,move,set}_chk is used, assume
10370 mem{cpy,pcpy,move,set} is available. */
10372 {
10387 }
10396 }
10399 else
10400 {
10403 /* If DEST is not a pointer type, call the normal function. */
10407 /* If SRC and DEST are the same (and not volatile), do nothing. */
10409 {
10410 tree expr;
10413 {
10414 /* Evaluate and ignore LEN in case it has side-effects. */
10417 }
10421 }
10423 /* __memmove_chk special case. */
10425 {
10431 /* If src is categorized for a readonly section we can use
10432 normal __memcpy_chk. */
10434 {
10443 }
10444 }
10446 }
10447 }
10449 /* Emit warning if a buffer overflow is detected at compile time. */
10451 static void
10453 {
10454 /* The source string. */
10456 /* The size of the destination object. */
10458 /* The string that is being concatenated with (as in __strcat_chk)
10459 or null if it isn't. */
10461 /* The maximum length of the source sequence in a bounded operation
10462 (such as __strncat_chk) or null if the operation isn't bounded
10463 (such as __strcat_chk). */
10465 /* The exact size of the access (such as in __strncpy_chk). */
10469 {
10477 /* For __strcat_chk the warning will be emitted only if overflowing
10478 by at least strlen (dest) + 1 bytes. */
10505 }
10508 {
10509 /* Check __strncat_chk. There is no way to determine the length
10510 of the string to which the source string is being appended so
10511 just warn when the length of the source string is not known. */
10514 }
10516 /* The destination argument is the first one for all built-ins above. */
10520 }
10522 /* Emit warning if a buffer overflow is detected at compile time
10523 in __sprintf_chk/__vsprintf_chk calls. */
10525 static void
10527 {
10532 /* Verify the required arguments in the original call. */
10542 /* Check whether the format is a literal string constant. */
10550 /* If the format doesn't contain % args or %%, we know its size. */
10553 /* If the format is "%s" and first ... argument is a string literal,
10554 we know it too. */
10557 {
10558 tree arg;
10569 }
10570 else
10573 /* Add one for the terminating nul. */
10578 }
10580 /* Emit warning if a free is called with address of a variable. */
10582 static void
10584 {
10598 else
10601 }
10603 /* Fold a call to __builtin_object_size with arguments PTR and OST,
10604 if possible. */
10606 static tree
10608 {
10625 /* __builtin_object_size doesn't evaluate side-effects in its arguments;
10626 if there are any side-effects, it returns (size_t) -1 for types 0 and 1
10627 and (size_t) 0 for types 2 and 3. */
10632 {
10636 }
10638 {
10639 /* If object size is not known yet, delay folding until
10640 later. Maybe subsequent passes will help determining
10641 it. */
10645 }
10648 }
10650 /* Builtins with folding operations that operate on "..." arguments
10651 need special handling; we need to store the arguments in a convenient
10652 data structure before attempting any folding. Fortunately there are
10653 only a few builtins that fall into this category. FNDECL is the
10654 function, EXP is the CALL_EXPR for the call. */
10656 static tree
10658 {
10663 {
10670 }
10672 {
10677 }
10679 }
10681 /* Initialize format string characters in the target charset. */
10683 bool
10685 {
10688 {
10711 }
10713 }
10715 /* Helper function for do_mpfr_arg*(). Ensure M is a normal number
10716 and no overflow/underflow occurred. INEXACT is true if M was not
10717 exactly calculated. TYPE is the tree type for the result. This
10718 function assumes that you cleared the MPFR flags and then
10719 calculated M to see if anything subsequently set a flag prior to
10720 entering this function. Return NULL_TREE if any checks fail. */
10722 static tree
10724 {
10725 /* Proceed iff we get a normal number, i.e. not NaN or Inf and no
10726 overflow/underflow occurred. If -frounding-math, proceed iff the
10727 result of calling FUNC was exact. */
10730 {
10731 REAL_VALUE_TYPE rr;
10734 /* Proceed iff GCC's REAL_VALUE_TYPE can hold the MPFR value,
10735 check for overflow/underflow. If the REAL_VALUE_TYPE is zero
10736 but the mpft_t is not, then we underflowed in the
10737 conversion. */
10740 {
10741 REAL_VALUE_TYPE rmode;
10744 /* Proceed iff the specified mode can hold the value. */
10747 }
10748 }
10750 }
10752 /* Helper function for do_mpc_arg*(). Ensure M is a normal complex
10753 number and no overflow/underflow occurred. INEXACT is true if M
10754 was not exactly calculated. TYPE is the tree type for the result.
10755 This function assumes that you cleared the MPFR flags and then
10756 calculated M to see if anything subsequently set a flag prior to
10757 entering this function. Return NULL_TREE if any checks fail, if
10758 FORCE_CONVERT is true, then bypass the checks. */
10760 static tree
10762 {
10763 /* Proceed iff we get a normal number, i.e. not NaN or Inf and no
10764 overflow/underflow occurred. If -frounding-math, proceed iff the
10765 result of calling FUNC was exact. */
10770 {
10775 /* Proceed iff GCC's REAL_VALUE_TYPE can hold the MPFR values,
10776 check for overflow/underflow. If the REAL_VALUE_TYPE is zero
10777 but the mpft_t is not, then we underflowed in the
10778 conversion. */
10783 {
10788 /* Proceed iff the specified mode can hold the value. */
10794 }
10795 }
10797 }
10799 /* If arguments ARG0 and ARG1 are REAL_CSTs, call mpfr_remquo() to set
10800 the pointer *(ARG_QUO) and return the result. The type is taken
10801 from the type of ARG0 and is used for setting the precision of the
10802 calculation and results. */
10804 static tree
10806 {
10813 /* To proceed, MPFR must exactly represent the target floating point
10814 format, which only happens when the target base equals two. */
10818 {
10823 {
10827 tree result_rem;
10836 /* Remquo is independent of the rounding mode, so pass
10837 inexact=0 to do_mpfr_ckconv(). */
10841 {
10842 /* MPFR calculates quo in the host's long so it may
10843 return more bits in quo than the target int can hold
10844 if sizeof(host long) > sizeof(target int). This can
10845 happen even for native compilers in LP64 mode. In
10846 these cases, modulo the quo value with the largest
10847 number that the target int can hold while leaving one
10848 bit for the sign. */
10852 /* Dereference the quo pointer argument. */
10854 /* Proceed iff a valid pointer type was passed in. */
10856 {
10857 /* Set the value. */
10858 tree result_quo
10861 integer_quo));
10863 /* Combine the quo assignment with the rem. */
10866 }
10867 }
10868 }
10869 }
10871 }
10873 /* If ARG is a REAL_CST, call mpfr_lgamma() on it and return the
10874 resulting value as a tree with type TYPE. The mpfr precision is
10875 set to the precision of TYPE. We assume that this mpfr function
10876 returns zero if the result could be calculated exactly within the
10877 requested precision. In addition, the integer pointer represented
10878 by ARG_SG will be dereferenced and set to the appropriate signgam
10879 (-1,1) value. */
10881 static tree
10883 {
10888 /* To proceed, MPFR must exactly represent the target floating point
10889 format, which only happens when the target base equals two. Also
10890 verify ARG is a constant and that ARG_SG is an int pointer. */
10895 {
10898 /* In addition to NaN and Inf, the argument cannot be zero or a
10899 negative integer. */
10903 {
10908 mpfr_t m;
10909 tree result_lg;
10918 {
10919 tree result_sg;
10921 /* Dereference the arg_sg pointer argument. */
10923 /* Assign the signgam value into *arg_sg. */
10928 /* Combine the signgam assignment with the lgamma result. */
10931 }
10932 }
10933 }
10936 }
10938 /* If arguments ARG0 and ARG1 are a COMPLEX_CST, call the two-argument
10939 mpc function FUNC on it and return the resulting value as a tree
10940 with type TYPE. The mpfr precision is set to the precision of
10941 TYPE. We assume that function FUNC returns zero if the result
10942 could be calculated exactly within the requested precision. If
10943 DO_NONFINITE is true, then fold expressions containing Inf or NaN
10944 in the arguments and/or results. */
10946 tree
10949 {
10955 /* To proceed, MPFR must exactly represent the target floating point
10956 format, which only happens when the target base equals two. */
10962 {
10971 {
10991 }
10992 }
10995 }
10997 /* A wrapper function for builtin folding that prevents warnings for
10998 "statement without effect" and the like, caused by removing the
10999 call node earlier than the warning is generated. */
11001 tree
11003 {
11009 {
11018 {
11020 }
11021 else
11022 {
11025 {
11026 /* Propagate location information from original call to
11027 expansion of builtin. Otherwise things like
11028 maybe_emit_chk_warning, that operate on the expansion
11029 of a builtin, will use the wrong location information. */
11031 {
11039 }
11041 }
11042 }
11043 }
11045 }
11047 /* Look up the function in builtin_decl that corresponds to DECL
11048 and set ASMSPEC as its user assembler name. DECL must be a
11049 function decl that declares a builtin. */
11051 void
11053 {
11062 {
11066 }
11067 }
11069 /* Return true if DECL is a builtin that expands to a constant or similarly
11070 simple code. */
11071 bool
11073 {
11076 {
11077 /* Builtins that expand to constants. */
11082 /* Simple register moves or loads from stack. */
11093 /* Exception state returns or moves registers around. */
11101 }
11104 }
11106 /* Return true if DECL is a builtin that is not expensive, i.e., they are
11107 most probably expanded inline into reasonably simple code. This is a
11108 superset of is_simple_builtin. */
11109 bool
11111 {
11118 {
11120 CASE_BUILT_IN_ALLOCA:
11186 }
11189 }
11191 /* Return true if T is a constant and the value cast to a target char
11192 can be represented by a host char.
11193 Store the casted char constant in *P if so. */
11195 bool
11197 {
11203 }
11205 /* Return the maximum object size. */
11207 tree
11209 {
11210 /* To do: Make this a configurable parameter. */
11212 }