| blob | dcac49d8be1327128039b714160e39d5021158f9 |
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. */
130 memop_ret retmode);
198 /* Return true if NAME starts with __builtin_ or __sync_. */
200 static bool
202 {
210 }
212 /* Return true if NODE should be considered for inline expansion regardless
213 of the optimization level. This means whenever a function is invoked with
214 its "internal" name, which normally contains the prefix "__builtin". */
216 bool
218 {
219 /* Note that we must use DECL_NAME, not DECL_ASSEMBLER_NAME_SET_P since
220 we want the name used to call the function, not the name it
221 will have. */
224 }
226 /* Compute values M and N such that M divides (address of EXP - N) and such
227 that N < M. If these numbers can be determined, store M in alignp and N in
228 *BITPOSP and return true. Otherwise return false and store BITS_PER_UNIT to
229 *alignp and any bit-offset to *bitposp.
231 Note that the address (and thus the alignment) computed here is based
232 on the address to which a symbol resolves, whereas DECL_ALIGN is based
233 on the address at which an object is actually located. These two
234 addresses are not always the same. For example, on ARM targets,
235 the address &foo of a Thumb function foo() has the lowest bit set,
236 whereas foo() itself starts on an even address.
238 If ADDR_P is true we are taking the address of the memory reference EXP
239 and thus cannot rely on the access taking place. */
241 static bool
244 {
246 tree offset;
247 machine_mode mode;
252 /* Get the innermost object and the constant (bitpos) and possibly
253 variable (offset) offset of the access. */
257 /* Extract alignment information from the innermost object and
258 possibly adjust bitpos and offset. */
260 {
261 /* Function addresses can encode extra information besides their
262 alignment. However, if TARGET_PTRMEMFUNC_VBIT_LOCATION
263 allows the low bit to be used as a virtual bit, we know
264 that the address itself must be at least 2-byte aligned. */
267 }
269 ;
271 {
272 /* The alignment of a CONST_DECL is determined by its initializer. */
279 }
281 {
284 }
288 {
294 /* If the address is explicitely aligned, handle that. */
297 {
302 }
304 known_alignment
308 /* Re-apply explicit alignment to the bitpos. */
311 /* The alignment of the pointer operand in a TARGET_MEM_REF
312 has to take the variable offset parts into account. */
314 {
316 {
321 }
325 }
327 /* When EXP is an actual memory reference then we can use
328 TYPE_ALIGN of a pointer indirection to derive alignment.
329 Do so only if get_pointer_alignment_1 did not reveal absolute
330 alignment knowledge and if using that alignment would
331 improve the situation. */
337 else
338 {
339 /* Else adjust bitpos accordingly. */
344 }
345 }
347 {
348 /* STRING_CST are the only constant objects we allow to be not
349 wrapped inside a CONST_DECL. */
355 }
357 /* If there is a non-constant offset part extract the maximum
358 alignment that can prevail. */
360 {
363 {
367 }
368 }
370 /* Account for the alignment of runtime coefficients, so that the constant
371 bitpos is guaranteed to be accurate. */
374 {
377 }
382 }
384 /* For a memory reference expression EXP compute values M and N such that M
385 divides (&EXP - N) and such that N < M. If these numbers can be determined,
386 store M in alignp and N in *BITPOSP and return true. Otherwise return false
387 and store BITS_PER_UNIT to *alignp and any bit-offset to *bitposp. */
389 bool
392 {
394 }
396 /* Return the alignment in bits of EXP, an object. */
398 unsigned int
400 {
406 /* align and bitpos now specify known low bits of the pointer.
407 ptr & (align - 1) == bitpos. */
412 }
414 /* For a pointer valued expression EXP compute values M and N such that M
415 divides (EXP - N) and such that N < M. If these numbers can be determined,
416 store M in alignp and N in *BITPOSP and return true. Return false if
417 the results are just a conservative approximation.
419 If EXP is not a pointer, false is returned too. */
421 bool
424 {
431 {
438 else
439 {
442 {
446 }
447 }
451 }
454 {
459 {
462 /* Make sure to return a sensible alignment when the multiplication
463 by BITS_PER_UNIT overflowed. */
466 /* We cannot really tell whether this result is an approximation. */
468 }
469 else
470 {
474 }
475 }
477 {
482 }
487 }
489 /* Return the alignment in bits of EXP, a pointer valued expression.
490 The alignment returned is, by default, the alignment of the thing that
491 EXP points to. If it is not a POINTER_TYPE, 0 is returned.
493 Otherwise, look at the expression to see if we can do better, i.e., if the
494 expression is actually pointing at an object whose alignment is tighter. */
496 unsigned int
498 {
504 /* align and bitpos now specify known low bits of the pointer.
505 ptr & (align - 1) == bitpos. */
511 }
513 /* Return the number of leading non-zero elements in the sequence
514 [ PTR, PTR + MAXELTS ) where each element's size is ELTSIZE bytes.
515 ELTSIZE must be a power of 2 less than 8. Used by c_strlen. */
517 unsigned
519 {
525 {
526 /* Optimize the common case of plain char. */
528 {
532 }
533 }
534 else
535 {
537 {
541 }
542 }
544 }
546 /* For a call at LOC to a function FN that expects a string in the argument
547 ARG, issue a diagnostic due to it being a called with an argument
548 declared at NONSTR that is a character array with no terminating NUL. */
550 void
552 {
560 {
564 }
565 }
567 /* If EXP refers to an unterminated constant character array return
568 the declaration of the object of which the array is a member or
569 element and if SIZE is not null, set *SIZE to the size of
570 the unterminated array and set *EXACT if the size is exact or
571 clear it otherwise. Otherwise return null. */
573 tree
575 {
576 /* C_STRLEN will return NULL and set DECL in the info
577 structure if EXP references a unterminated array. */
578 c_strlen_data data;
582 {
584 {
587 {
588 /* Constant offsets are already accounted for in data.len, but
589 not in a SSA_NAME + CST expression. */
594 {
595 /* Subtract the offset from the size of the array. */
600 }
601 else
603 }
604 else
608 }
610 }
613 }
615 /* Compute the length of a null-terminated character string or wide
616 character string handling character sizes of 1, 2, and 4 bytes.
617 TREE_STRING_LENGTH is not the right way because it evaluates to
618 the size of the character array in bytes (as opposed to characters)
619 and because it can contain a zero byte in the middle.
621 ONLY_VALUE should be nonzero if the result is not going to be emitted
622 into the instruction stream and zero if it is going to be expanded.
623 E.g. with i++ ? "foo" : "bar", if ONLY_VALUE is nonzero, constant 3
624 is returned, otherwise NULL, since
625 len = c_strlen (src, 1); if (len) expand_expr (len, ...); would not
626 evaluate the side-effects.
628 If ONLY_VALUE is two then we do not emit warnings about out-of-bound
629 accesses. Note that this implies the result is not going to be emitted
630 into the instruction stream.
632 Additional information about the string accessed may be recorded
633 in DATA. For example, if SRC references an unterminated string,
634 then the declaration will be stored in the DECL field. If the
635 length of the unterminated string can be determined, it'll be
636 stored in the LEN field. Note this length could well be different
637 than what a C strlen call would return.
639 ELTSIZE is 1 for normal single byte character strings, and 2 or
640 4 for wide characer strings. ELTSIZE is by default 1.
642 The value returned is of type `ssizetype'. */
644 tree
646 {
647 /* If we were not passed a DATA pointer, then get one to a local
648 structure. That avoids having to check DATA for NULL before
649 each time we want to use it. */
650 c_strlen_data local_strlen_data;
659 {
666 }
674 /* Offset from the beginning of the string in bytes. */
675 tree byteoff;
676 tree memsize;
677 tree decl;
682 /* Determine the size of the string element. */
686 /* Set MAXELTS to sizeof (SRC) / sizeof (*SRC) - 1, the maximum possible
687 length of SRC. Prefer TYPE_SIZE() to TREE_STRING_LENGTH() if possible
688 in case the latter is less than the size of the array, such as when
689 SRC refers to a short string literal used to initialize a large array.
690 In that case, the elements of the array after the terminating NUL are
691 all NUL. */
700 /* PTR can point to the byte representation of any string type, including
701 char* and wchar_t*. */
705 {
706 /* The code below works only for single byte character types. */
710 /* If the string has an internal NUL character followed by any
711 non-NUL characters (e.g., "foo\0bar"), we can't compute
712 the offset to the following NUL if we don't know where to
713 start searching for it. */
716 /* Return when an embedded null character is found or none at all.
717 In the latter case, set the DECL/LEN field in the DATA structure
718 so that callers may examine them. */
722 {
727 }
729 /* For empty strings the result should be zero. */
733 /* We don't know the starting offset, but we do know that the string
734 has no internal zero bytes. If the offset falls within the bounds
735 of the string subtract the offset from the length of the string,
736 and return that. Otherwise the length is zero. Take care to
737 use SAVE_EXPR in case the OFFSET has side-effects. */
744 offsave);
748 }
750 /* Offset from the beginning of the string in elements. */
751 HOST_WIDE_INT eltoff;
753 /* We have a known offset into the string. Start searching there for
754 a null character if we can represent it as a single HOST_WIDE_INT. */
759 else
762 /* If the offset is known to be out of bounds, warn, and call strlen at
763 runtime. */
765 {
766 /* Suppress multiple warnings for propagated constant strings. */
769 {
772 eltoff);
774 }
776 }
778 /* If eltoff is larger than strelts but less than maxelts the
779 string length is zero, since the excess memory will be zero. */
783 /* Use strlen to search for the first zero byte. Since any strings
784 constructed with build_string will have nulls appended, we win even
785 if we get handed something like (char[4])"abcd".
787 Since ELTOFF is our starting index into the string, no further
788 calculation is needed. */
792 /* Don't know what to return if there was no zero termination.
793 Ideally this would turn into a gcc_checking_assert over time.
794 Set DECL/LEN so callers can examine them. */
796 {
801 }
804 }
806 /* Return a constant integer corresponding to target reading
807 GET_MODE_BITSIZE (MODE) bits from string constant STR. */
809 static rtx
811 {
812 HOST_WIDE_INT ch;
826 {
838 }
842 }
844 /* Cast a target constant CST to target CHAR and if that value fits into
845 host char type, return zero and put that value into variable pointed to by
846 P. */
848 static int
850 {
857 /* Do not care if it fits or not right here. */
872 }
874 /* Similar to save_expr, but assumes that arbitrary code is not executed
875 in between the multiple evaluations. In particular, we assume that a
876 non-addressable local variable will not be modified. */
878 static tree
880 {
888 }
890 /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
891 times to get the address of either a higher stack frame, or a return
892 address located within it (depending on FNDECL_CODE). */
894 static rtx
896 {
900 {
901 /* For a zero count with __builtin_return_address, we don't care what
902 frame address we return, because target-specific definitions will
903 override us. Therefore frame pointer elimination is OK, and using
904 the soft frame pointer is OK.
906 For a nonzero count, or a zero count with __builtin_frame_address,
907 we require a stable offset from the current frame pointer to the
908 previous one, so we must use the hard frame pointer, and
909 we must disable frame pointer elimination. */
912 else
913 {
916 /* Tell reload not to eliminate the frame pointer. */
918 }
919 }
924 /* On the SPARC, the return address is not in the frame, it is in a
925 register. There is no way to access it off of the current frame
926 pointer, but it can be accessed off the previous frame pointer by
927 reading the value from the register window save area. */
929 count--;
931 /* Scan back COUNT frames to the specified frame. */
933 {
934 /* Assume the dynamic chain pointer is in the word that the
935 frame address points to, unless otherwise specified. */
940 }
942 /* For __builtin_frame_address, return what we've got. But, on
943 the SPARC for example, we may have to add a bias. */
947 /* For __builtin_return_address, get the return address from that frame. */
948 #ifdef RETURN_ADDR_RTX
950 #else
954 #endif
956 }
958 /* Alias set used for setjmp buffer. */
961 /* Construct the leading half of a __builtin_setjmp call. Control will
962 return to RECEIVER_LABEL. This is also called directly by the SJLJ
963 exception handling code. */
965 void
967 {
969 rtx stack_save;
970 rtx mem;
979 /* We store the frame pointer and the address of receiver_label in
980 the buffer and use the rest of it for the stack save area, which
981 is machine-dependent. */
1000 /* If there is further processing to do, do it. */
1004 /* We have a nonlocal label. */
1006 }
1008 /* Construct the trailing part of a __builtin_setjmp call. This is
1009 also called directly by the SJLJ exception handling code.
1010 If RECEIVER_LABEL is NULL, instead contruct a nonlocal goto handler. */
1012 void
1014 {
1015 rtx chain;
1017 /* Mark the FP as used when we get here, so we have to make sure it's
1018 marked as used by this function. */
1021 /* Mark the static chain as clobbered here so life information
1022 doesn't get messed up for it. */
1027 /* Now put in the code to restore the frame pointer, and argument
1028 pointer, if needed. */
1030 {
1031 /* First adjust our frame pointer to its actual value. It was
1032 previously set to the start of the virtual area corresponding to
1033 the stacked variables when we branched here and now needs to be
1034 adjusted to the actual hardware fp value.
1036 Assignments to virtual registers are converted by
1037 instantiate_virtual_regs into the corresponding assignment
1038 to the underlying register (fp in this case) that makes
1039 the original assignment true.
1040 So the following insn will actually be decrementing fp by
1041 TARGET_STARTING_FRAME_OFFSET. */
1044 /* Restoring the frame pointer also modifies the hard frame pointer.
1045 Mark it used (so that the previous assignment remains live once
1046 the frame pointer is eliminated) and clobbered (to represent the
1047 implicit update from the assignment). */
1050 }
1053 {
1054 /* If the argument pointer can be eliminated in favor of the
1055 frame pointer, we don't need to restore it. We assume here
1056 that if such an elimination is present, it can always be used.
1057 This is the case on all known machines; if we don't make this
1058 assumption, we do unnecessary saving on many machines. */
1068 {
1069 /* Now restore our arg pointer from the address at which it
1070 was saved in our stack frame. */
1073 }
1074 }
1080 else
1083 /* We must not allow the code we just generated to be reordered by
1084 scheduling. Specifically, the update of the frame pointer must
1085 happen immediately, not later. */
1087 }
1089 /* __builtin_longjmp is passed a pointer to an array of five words (not
1090 all will be used on all machines). It operates similarly to the C
1091 library function of the same name, but is more efficient. Much of
1092 the code below is copied from the handling of non-local gotos. */
1094 static void
1096 {
1101 /* DRAP is needed for stack realign if longjmp is expanded to current
1102 function */
1113 /* We require that the user must pass a second argument of 1, because
1114 that is what builtin_setjmp will return. */
1120 else
1121 {
1132 /* Pick up FP, label, and SP from the block and jump. This code is
1133 from expand_goto in stmt.c; see there for detailed comments. */
1135 /* We have to pass a value to the nonlocal_goto pattern that will
1136 get copied into the static_chain pointer, but it does not matter
1137 what that value is, because builtin_setjmp does not use it. */
1139 else
1140 {
1152 }
1153 }
1155 /* Search backwards and mark the jump insn as a non-local goto.
1156 Note that this precludes the use of __builtin_longjmp to a
1157 __builtin_setjmp target in the same function. However, we've
1158 already cautioned the user that these functions are for
1159 internal exception handling use only. */
1161 {
1165 {
1168 }
1171 }
1172 }
1176 {
1178 }
1180 /* This function validates the types of a function call argument list
1181 against a specified list of tree_codes. If the last specifier is a 0,
1182 that represents an ellipsis, otherwise the last specifier must be a
1183 VOID_TYPE. */
1185 static bool
1187 {
1191 const_call_expr_arg_iterator iter;
1192 const_tree arg;
1197 /* Get a bitmap of pointer argument numbers declared attribute nonnull. */
1202 {
1206 {
1208 /* This signifies an ellipses, any further arguments are all ok. */
1212 /* This signifies an endlink, if no arguments remain, return
1213 true, otherwise return false. */
1217 /* The actual argument must be nonnull when either the whole
1218 called function has been declared nonnull, or when the formal
1219 argument corresponding to the actual argument has been. */
1222 {
1227 }
1228 /* FALLTHRU */
1230 /* If no parameters remain or the parameter's code does not
1231 match the specified code, return false. Otherwise continue
1232 checking any remaining arguments. */
1237 }
1238 }
1240 /* We need gotos here since we can only have one VA_CLOSE in a
1241 function. */
1242 end: ;
1248 }
1250 /* Expand a call to __builtin_nonlocal_goto. We're passed the target label
1251 and the address of the save area. */
1253 static rtx
1255 {
1270 /* Copy the address of the save location to a register just in case it was
1271 based on the frame pointer. */
1280 /* ??? We no longer need to pass the static chain value, afaik. */
1283 else
1284 {
1290 /* Restore frame pointer for containing function. */
1294 /* USE of hard_frame_pointer_rtx added for consistency;
1295 not clear if really needed. */
1299 /* If the architecture is using a GP register, we must
1300 conservatively assume that the target function makes use of it.
1301 The prologue of functions with nonlocal gotos must therefore
1302 initialize the GP register to the appropriate value, and we
1303 must then make sure that this value is live at the point
1304 of the jump. (Note that this doesn't necessarily apply
1305 to targets with a nonlocal_goto pattern; they are free
1306 to implement it in their own way. Note also that this is
1307 a no-op if the GP register is a global invariant.) */
1313 }
1315 /* Search backwards to the jump insn and mark it as a
1316 non-local goto. */
1318 {
1320 {
1323 }
1326 }
1329 }
1331 /* __builtin_update_setjmp_buf is passed a pointer to an array of five words
1332 (not all will be used on all machines) that was passed to __builtin_setjmp.
1333 It updates the stack pointer in that block to the current value. This is
1334 also called directly by the SJLJ exception handling code. */
1336 void
1338 {
1341 rtx stack_save
1343 memory_address
1349 }
1351 /* Expand a call to __builtin_prefetch. For a target that does not support
1352 data prefetch, evaluate the memory address argument in case it has side
1353 effects. */
1355 static void
1357 {
1367 /* Arguments 1 and 2 are optional; argument 1 (read/write) defaults to
1368 zero (read) and argument 2 (locality) defaults to 3 (high degree of
1369 locality). */
1373 else
1377 else
1380 /* Argument 0 is an address. */
1383 /* Argument 1 (read/write flag) must be a compile-time constant int. */
1385 {
1388 }
1390 /* Argument 1 must be either zero or one. */
1392 {
1396 }
1398 /* Argument 2 (locality) must be a compile-time constant int. */
1400 {
1403 }
1405 /* Argument 2 must be 0, 1, 2, or 3. */
1407 {
1410 }
1413 {
1421 }
1423 /* Don't do anything with direct references to volatile memory, but
1424 generate code to handle other side effects. */
1427 }
1429 /* Get a MEM rtx for expression EXP which is the address of an operand
1430 to be used in a string instruction (cmpstrsi, movmemsi, ..). LEN is
1431 the maximum length of the block of memory that might be accessed or
1432 NULL if unknown. */
1434 static rtx
1436 {
1440 /* When EXP is not resolved SAVE_EXPR, MEM_ATTRS can be still derived
1441 from its expression, for expr->a.b only <variable>.a.b is recorded. */
1448 /* Get an expression we can use to find the attributes to assign to MEM.
1449 First remove any nops. */
1454 /* Build a MEM_REF representing the whole accessed area as a byte blob,
1455 (as builtin stringops may alias with anything). */
1462 /* If the MEM_REF has no acceptable address, try to get the base object
1463 from the original address we got, and build an all-aliasing
1464 unknown-sized access to that one. */
1470 {
1475 size_zero_node,
1476 NULL)),
1479 }
1482 }
1483 \f
1484 /* Built-in functions to perform an untyped call and return. */
1486 #define apply_args_mode \
1487 (this_target_builtins->x_apply_args_mode)
1488 #define apply_result_mode \
1489 (this_target_builtins->x_apply_result_mode)
1491 /* Return the size required for the block returned by __builtin_apply_args,
1492 and initialize apply_args_mode. */
1494 static int
1496 {
1501 /* The values computed by this function never change. */
1503 {
1504 /* The first value is the incoming arg-pointer. */
1507 /* The second value is the structure value address unless this is
1508 passed as an "invisible" first argument. */
1514 {
1524 }
1525 else
1526 {
1528 }
1529 }
1531 }
1533 /* Return the size required for the block returned by __builtin_apply,
1534 and initialize apply_result_mode. */
1536 static int
1538 {
1542 /* The values computed by this function never change. */
1544 {
1549 {
1559 }
1560 else
1563 /* Allow targets that use untyped_call and untyped_return to override
1564 the size so that machine-specific information can be stored here. */
1565 #ifdef APPLY_RESULT_SIZE
1567 #endif
1568 }
1570 }
1572 /* Create a vector describing the result block RESULT. If SAVEP is true,
1573 the result block is used to save the values; otherwise it is used to
1574 restore the values. */
1576 static rtx
1578 {
1580 fixed_size_mode mode;
1587 {
1597 }
1599 }
1601 /* Save the state required to perform an untyped call with the same
1602 arguments as were passed to the current function. */
1604 static rtx
1606 {
1609 fixed_size_mode mode;
1610 rtx struct_incoming_value = targetm.calls.struct_value_rtx (cfun ? TREE_TYPE (cfun->decl) : 0, 1);
1612 /* Create a block where the arg-pointer, structure value address,
1613 and argument registers can be saved. */
1616 /* Walk past the arg-pointer and structure value address. */
1621 /* Save each register used in calling a function to the block. */
1624 {
1633 }
1635 /* Save the arg pointer to the block. */
1637 /* We need the pointer as the caller actually passed them to us, not
1638 as we might have pretended they were passed. Make sure it's a valid
1639 operand, as emit_move_insn isn't expected to handle a PLUS. */
1641 tem
1644 NULL_RTX);
1649 /* Save the structure value address unless this is passed as an
1650 "invisible" first argument. */
1652 {
1656 }
1658 /* Return the address of the block. */
1660 }
1662 /* __builtin_apply_args returns block of memory allocated on
1663 the stack into which is stored the arg pointer, structure
1664 value address, static chain, and all the registers that might
1665 possibly be used in performing a function call. The code is
1666 moved to the start of the function so the incoming values are
1667 saved. */
1669 static rtx
1671 {
1672 /* Don't do __builtin_apply_args more than once in a function.
1673 Save the result of the first call and reuse it. */
1676 {
1677 /* When this function is called, it means that registers must be
1678 saved on entry to this function. So we migrate the
1679 call to the first insn of this function. */
1680 rtx temp;
1689 /* Put the insns after the NOTE that starts the function.
1690 If this is inside a start_sequence, make the outer-level insn
1691 chain current, so the code is placed at the start of the
1692 function. If internal_arg_pointer is a non-virtual pseudo,
1693 it needs to be placed after the function that initializes
1694 that pseudo. */
1699 else
1703 }
1704 }
1706 /* Perform an untyped call and save the state required to perform an
1707 untyped return of whatever value was returned by the given function. */
1709 static rtx
1711 {
1713 fixed_size_mode mode;
1722 /* Create a block where the return registers can be saved. */
1725 /* Fetch the arg pointer from the ARGUMENTS block. */
1732 /* Push a new argument block and copy the arguments. Do not allow
1733 the (potential) memcpy call below to interfere with our stack
1734 manipulations. */
1736 NO_DEFER_POP;
1738 /* Save the stack with nonlocal if available. */
1741 else
1744 /* Allocate a block of memory onto the stack and copy the memory
1745 arguments to the outgoing arguments address. We can pass TRUE
1746 as the 4th argument because we just saved the stack pointer
1747 and will restore it right after the call. */
1750 /* Set DRAP flag to true, even though allocate_dynamic_stack_space
1751 may have already set current_function_calls_alloca to true.
1752 current_function_calls_alloca won't be set if argsize is zero,
1753 so we have to guarantee need_drap is true here. */
1759 {
1762 else
1764 }
1771 /* Refer to the argument block. */
1776 /* Walk past the arg-pointer and structure value address. */
1781 /* Restore each of the registers previously saved. Make USE insns
1782 for each of these registers for use in making the call. */
1785 {
1793 }
1795 /* Restore the structure value address unless this is passed as an
1796 "invisible" first argument. */
1799 {
1806 }
1808 /* All arguments and registers used for the call are set up by now! */
1811 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
1812 and we don't want to load it into a register as an optimization,
1813 because prepare_call_address already did it if it should be done. */
1817 /* Generate the actual call instruction and save the return value. */
1819 {
1823 }
1825 {
1828 /* Locate the unique return register. It is not possible to
1829 express a call that sets more than one return register using
1830 call_value; use untyped_call for that. In fact, untyped_call
1831 only needs to save the return registers in the given block. */
1834 {
1838 }
1845 }
1846 else
1849 /* Find the CALL insn we just emitted, and attach the register usage
1850 information. */
1854 /* Restore the stack. */
1857 else
1861 OK_DEFER_POP;
1863 /* Return the address of the result block. */
1866 }
1868 /* Perform an untyped return. */
1870 static void
1872 {
1874 fixed_size_mode mode;
1875 rtx reg;
1884 {
1889 }
1891 /* Restore the return value and note that each value is used. */
1895 {
1907 }
1909 /* Put the USE insns before the return. */
1912 /* Return whatever values was restored by jumping directly to the end
1913 of the function. */
1915 }
1917 /* Used by expand_builtin_classify_type and fold_builtin_classify_type. */
1919 static enum type_class
1921 {
1923 {
1942 }
1943 }
1945 /* Expand a call EXP to __builtin_classify_type. */
1947 static rtx
1949 {
1953 }
1955 /* This helper macro, meant to be used in mathfn_built_in below, determines
1956 which among a set of builtin math functions is appropriate for a given type
1957 mode. The `F' (float) and `L' (long double) are automatically generated
1958 from the 'double' case. If a function supports the _Float<N> and _Float<N>X
1959 types, there are additional types that are considered with 'F32', 'F64',
1960 'F128', etc. suffixes. */
1961 #define CASE_MATHFN(MATHFN) \
1962 CASE_CFN_##MATHFN: \
1963 fcode = BUILT_IN_##MATHFN; fcodef = BUILT_IN_##MATHFN##F ; \
1964 fcodel = BUILT_IN_##MATHFN##L ; break;
1965 /* Similar to the above, but also add support for the _Float<N> and _Float<N>X
1966 types. */
1967 #define CASE_MATHFN_FLOATN(MATHFN) \
1968 CASE_CFN_##MATHFN: \
1969 fcode = BUILT_IN_##MATHFN; fcodef = BUILT_IN_##MATHFN##F ; \
1970 fcodel = BUILT_IN_##MATHFN##L ; fcodef16 = BUILT_IN_##MATHFN##F16 ; \
1971 fcodef32 = BUILT_IN_##MATHFN##F32; fcodef64 = BUILT_IN_##MATHFN##F64 ; \
1972 fcodef128 = BUILT_IN_##MATHFN##F128 ; fcodef32x = BUILT_IN_##MATHFN##F32X ; \
1973 fcodef64x = BUILT_IN_##MATHFN##F64X ; fcodef128x = BUILT_IN_##MATHFN##F128X ;\
1974 break;
1975 /* Similar to above, but appends _R after any F/L suffix. */
1976 #define CASE_MATHFN_REENT(MATHFN) \
1977 case CFN_BUILT_IN_##MATHFN##_R: \
1978 case CFN_BUILT_IN_##MATHFN##F_R: \
1979 case CFN_BUILT_IN_##MATHFN##L_R: \
1980 fcode = BUILT_IN_##MATHFN##_R; fcodef = BUILT_IN_##MATHFN##F_R ; \
1981 fcodel = BUILT_IN_##MATHFN##L_R ; break;
1983 /* Return a function equivalent to FN but operating on floating-point
1984 values of type TYPE, or END_BUILTINS if no such function exists.
1985 This is purely an operation on function codes; it does not guarantee
1986 that the target actually has an implementation of the function. */
1988 static built_in_function
1990 {
1991 tree mtype;
2002 {
2093 }
2116 else
2118 }
2120 /* Return mathematic function equivalent to FN but operating directly on TYPE,
2121 if available. If IMPLICIT_P is true use the implicit builtin declaration,
2122 otherwise use the explicit declaration. If we can't do the conversion,
2123 return null. */
2125 static tree
2127 {
2136 }
2138 /* Like mathfn_built_in_1, but always use the implicit array. */
2140 tree
2142 {
2144 }
2146 /* Like mathfn_built_in_1, but take a built_in_function and
2147 always use the implicit array. */
2149 tree
2151 {
2153 }
2155 /* If BUILT_IN_NORMAL function FNDECL has an associated internal function,
2156 return its code, otherwise return IFN_LAST. Note that this function
2157 only tests whether the function is defined in internals.def, not whether
2158 it is actually available on the target. */
2160 internal_fn
2162 {
2166 {
2167 #define DEF_INTERNAL_FLT_FN(NAME, FLAGS, OPTAB, TYPE) \
2168 CASE_FLT_FN (BUILT_IN_##NAME): return IFN_##NAME;
2169 #define DEF_INTERNAL_FLT_FLOATN_FN(NAME, FLAGS, OPTAB, TYPE) \
2170 CASE_FLT_FN (BUILT_IN_##NAME): return IFN_##NAME; \
2171 CASE_FLT_FN_FLOATN_NX (BUILT_IN_##NAME): return IFN_##NAME;
2172 #define DEF_INTERNAL_INT_FN(NAME, FLAGS, OPTAB, TYPE) \
2173 CASE_INT_FN (BUILT_IN_##NAME): return IFN_##NAME;
2190 }
2191 }
2193 /* If CALL is a call to a BUILT_IN_NORMAL function that could be replaced
2194 on the current target by a call to an internal function, return the
2195 code of that internal function, otherwise return IFN_LAST. The caller
2196 is responsible for ensuring that any side-effects of the built-in
2197 call are dealt with correctly. E.g. if CALL sets errno, the caller
2198 must decide that the errno result isn't needed or make it available
2199 in some other way. */
2201 internal_fn
2203 {
2205 {
2208 {
2213 }
2214 }
2216 }
2218 /* Expand a call to the builtin trinary math functions (fma).
2219 Return NULL_RTX if a normal call should be emitted rather than expanding the
2220 function in-line. EXP is the expression that is a call to the builtin
2221 function; if convenient, the result should be placed in TARGET.
2222 SUBTARGET may be used as the target for computing one of EXP's
2223 operands. */
2225 static rtx
2227 {
2228 optab builtin_optab;
2233 machine_mode mode;
2243 {
2249 }
2251 /* Make a suitable register to place result in. */
2254 /* Before working hard, check whether the instruction is available. */
2260 /* Always stabilize the argument list. */
2271 /* Compute into RESULT.
2272 Set RESULT to wherever the result comes back. */
2276 /* If we were unable to expand via the builtin, stop the sequence
2277 (without outputting the insns) and call to the library function
2278 with the stabilized argument list. */
2280 {
2283 }
2285 /* Output the entire sequence. */
2291 }
2293 /* Expand a call to the builtin sin and cos math functions.
2294 Return NULL_RTX if a normal call should be emitted rather than expanding the
2295 function in-line. EXP is the expression that is a call to the builtin
2296 function; if convenient, the result should be placed in TARGET.
2297 SUBTARGET may be used as the target for computing one of EXP's
2298 operands. */
2300 static rtx
2302 {
2303 optab builtin_optab;
2304 rtx op0;
2307 machine_mode mode;
2308 tree arg;
2316 {
2322 }
2324 /* Make a suitable register to place result in. */
2327 /* Check if sincos insn is available, otherwise fallback
2328 to sin or cos insn. */
2331 {
2338 }
2340 /* Before working hard, check whether the instruction is available. */
2342 {
2345 /* Wrap the computation of the argument in a SAVE_EXPR, as we may
2346 need to expand the argument again. This way, we will not perform
2347 side-effects more the once. */
2354 /* Compute into RESULT.
2355 Set RESULT to wherever the result comes back. */
2357 {
2361 {
2370 }
2372 }
2373 else
2377 {
2378 /* Output the entire sequence. */
2383 }
2385 /* If we were unable to expand via the builtin, stop the sequence
2386 (without outputting the insns) and call to the library function
2387 with the stabilized argument list. */
2389 }
2392 }
2394 /* Given an interclass math builtin decl FNDECL and it's argument ARG
2395 return an RTL instruction code that implements the functionality.
2396 If that isn't possible or available return CODE_FOR_nothing. */
2398 static enum insn_code
2400 {
2403 machine_mode mode;
2406 {
2420 /* These builtins have no optabs (yet). */
2424 }
2426 /* There's no easy way to detect the case we need to set EDOM. */
2430 /* Optab mode depends on the mode of the input argument. */
2436 }
2438 /* Expand a call to one of the builtin math functions that operate on
2439 floating point argument and output an integer result (ilogb, isinf,
2440 isnan, etc).
2441 Return 0 if a normal call should be emitted rather than expanding the
2442 function in-line. EXP is the expression that is a call to the builtin
2443 function; if convenient, the result should be placed in TARGET. */
2445 static rtx
2447 {
2449 rtx op0;
2451 machine_mode mode;
2452 tree arg;
2462 {
2467 /* Wrap the computation of the argument in a SAVE_EXPR, as we may
2468 need to expand the argument again. This way, we will not perform
2469 side-effects more the once. */
2484 }
2487 }
2489 /* Expand a call to the builtin sincos math function.
2490 Return NULL_RTX if a normal call should be emitted rather than expanding the
2491 function in-line. EXP is the expression that is a call to the builtin
2492 function. */
2494 static rtx
2496 {
2498 machine_mode mode;
2512 /* Make a suitable register to place result in. */
2515 /* Check if sincos insn is available, otherwise emit the call. */
2530 /* Compute into target1 and target2.
2531 Set TARGET to wherever the result comes back. */
2535 /* Move target1 and target2 to the memory locations indicated
2536 by op1 and op2. */
2541 }
2543 /* Expand a call to the internal cexpi builtin to the sincos math function.
2544 EXP is the expression that is a call to the builtin function; if convenient,
2545 the result should be placed in TARGET. */
2547 static rtx
2549 {
2552 machine_mode mode;
2563 /* Try expanding via a sincos optab, fall back to emitting a libcall
2564 to sincos or cexp. We are sure we have sincos or cexp because cexpi
2565 is only generated from sincos, cexp or if we have either of them. */
2567 {
2573 /* Compute into op1 and op2. */
2575 }
2577 {
2588 else
2598 /* Make sure not to fold the sincos call again. */
2602 }
2603 else
2604 {
2614 else
2617 /* If we don't have a decl for cexp create one. This is the
2618 friendliest fallback if the user calls __builtin_cexpi
2619 without full target C99 function support. */
2621 {
2622 tree fntype;
2634 }
2639 /* Make sure not to fold the cexp call again. */
2643 }
2645 /* Now build the proper return type. */
2650 }
2652 /* Conveniently construct a function call expression. FNDECL names the
2653 function to be called, N is the number of arguments, and the "..."
2654 parameters are the argument expressions. Unlike build_call_exr
2655 this doesn't fold the call, hence it will always return a CALL_EXPR. */
2657 static tree
2659 {
2669 }
2671 /* Expand a call to one of the builtin rounding functions gcc defines
2672 as an extension (lfloor and lceil). As these are gcc extensions we
2673 do not need to worry about setting errno to EDOM.
2674 If expanding via optab fails, lower expression to (int)(floor(x)).
2675 EXP is the expression that is a call to the builtin function;
2676 if convenient, the result should be placed in TARGET. */
2678 static rtx
2680 {
2681 convert_optab builtin_optab;
2686 tree fallback_fndecl;
2687 machine_mode mode;
2688 tree arg;
2696 {
2713 }
2715 /* Make a suitable register to place result in. */
2720 /* Wrap the computation of the argument in a SAVE_EXPR, as we may
2721 need to expand the argument again. This way, we will not perform
2722 side-effects more the once. */
2729 /* Compute into TARGET. */
2731 {
2732 /* Output the entire sequence. */
2737 }
2739 /* If we were unable to expand via the builtin, stop the sequence
2740 (without outputting the insns). */
2743 /* Fall back to floating point rounding optab. */
2746 /* For non-C99 targets we may end up without a fallback fndecl here
2747 if the user called __builtin_lfloor directly. In this case emit
2748 a call to the floor/ceil variants nevertheless. This should result
2749 in the best user experience for not full C99 targets. */
2751 {
2752 tree fntype;
2756 {
2789 }
2794 }
2801 /* Truncate the result of floating point optab to integer
2802 via expand_fix (). */
2807 }
2809 /* Expand a call to one of the builtin math functions doing integer
2810 conversion (lrint).
2811 Return 0 if a normal call should be emitted rather than expanding the
2812 function in-line. EXP is the expression that is a call to the builtin
2813 function; if convenient, the result should be placed in TARGET. */
2815 static rtx
2817 {
2818 convert_optab builtin_optab;
2819 rtx op0;
2822 tree arg;
2823 machine_mode mode;
2832 {
2851 }
2853 /* There's no easy way to detect the case we need to set EDOM. */
2857 /* Make a suitable register to place result in. */
2860 /* There's no easy way to detect the case we need to set EDOM. */
2862 {
2865 /* Wrap the computation of the argument in a SAVE_EXPR, as we may
2866 need to expand the argument again. This way, we will not perform
2867 side-effects more the once. */
2875 {
2876 /* Output the entire sequence. */
2881 }
2883 /* If we were unable to expand via the builtin, stop the sequence
2884 (without outputting the insns) and call to the library function
2885 with the stabilized argument list. */
2887 }
2890 {
2891 /* Fall back to rounding to long int. Use implicit_p 0 - for non-C99
2892 targets, (int) round (x) should never be transformed into
2893 BUILT_IN_IROUND and if __builtin_iround is called directly, emit
2894 a call to lround in the hope that the target provides at least some
2895 C99 functions. This should result in the best user experience for
2896 not full C99 targets. */
2897 tree fallback_fndecl = mathfn_built_in_1
2906 }
2909 }
2911 /* Expand a call to the powi built-in mathematical function. Return NULL_RTX if
2912 a normal call should be emitted rather than expanding the function
2913 in-line. EXP is the expression that is a call to the builtin
2914 function; if convenient, the result should be placed in TARGET. */
2916 static rtx
2918 {
2921 machine_mode mode;
2922 machine_mode mode2;
2931 /* Emit a libcall to libgcc. */
2933 /* Mode of the 2nd argument must match that of an int. */
2951 }
2953 /* Expand expression EXP which is a call to the strlen builtin. Return
2954 NULL_RTX if we failed and the caller should emit a normal call, otherwise
2955 try to get the result in TARGET, if convenient. */
2957 static rtx
2959 machine_mode target_mode)
2960 {
2965 rtx pat;
2966 tree len;
2968 rtx src_reg;
2970 machine_mode insn_mode;
2974 /* If the length can be computed at compile-time, return it. */
2979 /* If the length can be computed at compile-time and is constant
2980 integer, but there are side-effects in src, evaluate
2981 src for side-effects, then return len.
2982 E.g. x = strlen (i++ ? "xfoo" + 1 : "bar");
2983 can be optimized into: i++; x = 3; */
2986 {
2989 }
2993 /* If SRC is not a pointer type, don't do this operation inline. */
2997 /* Bail out if we can't compute strlen in the right mode. */
2999 {
3003 }
3007 /* Make a place to hold the source address. We will not expand
3008 the actual source until we are sure that the expansion will
3009 not fail -- there are trees that cannot be expanded twice. */
3012 /* Mark the beginning of the strlen sequence so we can emit the
3013 source operand later. */
3023 /* Check to see if the argument was declared attribute nonstring
3024 and if so, issue a warning since at this point it's not known
3025 to be nul-terminated. */
3028 /* Now that we are assured of success, expand the source. */
3032 {
3033 #ifdef POINTERS_EXTEND_UNSIGNED
3036 POINTERS_EXTEND_UNSIGNED);
3037 #endif
3039 }
3045 else
3048 /* Return the value in the proper mode for this function. */
3053 else
3057 }
3059 /* Expand call EXP to the strnlen built-in, returning the result
3060 and setting it in TARGET. Otherwise return NULL_RTX on failure. */
3062 static rtx
3064 {
3081 /* FIXME: Change c_strlen() to return sizetype instead of ssizetype
3082 so these conversions aren't necessary. */
3083 c_strlen_data data;
3090 {
3094 "%K%qD specified bound %E "
3101 {
3102 /* Clear EXACT if LEN may be less than SRC suggests,
3103 such as in
3104 strnlen (&a[i], sizeof a)
3105 where the value of i is unknown. Unless i's value is
3106 zero, the call is unsafe because the bound is greater. */
3110 }
3116 {
3117 location_t warnloc
3121 exact
3127 {
3132 }
3133 }
3140 }
3153 "%K%qD specified bound [%wu, %wu] "
3160 {
3164 }
3170 {
3171 location_t warnloc
3175 exact
3181 {
3185 }
3186 }
3196 }
3198 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
3199 bytes from constant string DATA + OFFSET and return it as target
3200 constant. */
3202 static rtx
3204 scalar_int_mode mode)
3205 {
3213 }
3215 /* LEN specify length of the block of memcpy/memset operation.
3216 Figure out its range and put it into MIN_SIZE/MAX_SIZE.
3217 In some cases we can make very likely guess on max size, then we
3218 set it into PROBABLE_MAX_SIZE. */
3220 static void
3225 {
3227 {
3230 }
3231 else
3232 {
3236 /* Determine bounds from the type. */
3239 else
3244 else
3250 {
3255 }
3257 {
3258 /* Anti range 0...N lets us to determine minimal size to N+1. */
3260 {
3263 }
3264 /* Code like
3266 int n;
3267 if (n < 100)
3268 memcpy (a, b, n)
3270 Produce anti range allowing negative values of N. We still
3271 can use the information and make a guess that N is not negative.
3272 */
3275 }
3276 }
3280 }
3282 /* Try to verify that the sizes and lengths of the arguments to a string
3283 manipulation function given by EXP are within valid bounds and that
3284 the operation does not lead to buffer overflow or read past the end.
3285 Arguments other than EXP may be null. When non-null, the arguments
3286 have the following meaning:
3287 DST is the destination of a copy call or NULL otherwise.
3288 SRC is the source of a copy call or NULL otherwise.
3289 DSTWRITE is the number of bytes written into the destination obtained
3290 from the user-supplied size argument to the function (such as in
3291 memcpy(DST, SRCs, DSTWRITE) or strncpy(DST, DRC, DSTWRITE).
3292 MAXREAD is the user-supplied bound on the length of the source sequence
3293 (such as in strncat(d, s, N). It specifies the upper limit on the number
3294 of bytes to write. If NULL, it's taken to be the same as DSTWRITE.
3295 SRCSTR is the source string (such as in strcpy(DST, SRC)) when the
3296 expression EXP is a string function call (as opposed to a memory call
3297 like memcpy). As an exception, SRCSTR can also be an integer denoting
3298 the precomputed size of the source string or object (for functions like
3299 memcpy).
3300 DSTSIZE is the size of the destination object specified by the last
3301 argument to the _chk builtins, typically resulting from the expansion
3302 of __builtin_object_size (such as in __builtin___strcpy_chk(DST, SRC,
3303 DSTSIZE).
3305 When DSTWRITE is null LEN is checked to verify that it doesn't exceed
3306 SIZE_MAX.
3308 If the call is successfully verified as safe return true, otherwise
3309 return false. */
3311 static bool
3314 {
3317 /* The size of the largest object is half the address space, or
3318 PTRDIFF_MAX. (This is way too permissive.) */
3321 /* Either the length of the source string for string functions or
3322 the size of the source object for raw memory functions. */
3327 /* Set to true when the exact number of bytes written by a string
3328 function like strcpy is not known and the only thing that is
3329 known is that it must be at least one (for the terminating nul). */
3332 {
3333 /* SRCSTR is normally a pointer to string but as a special case
3334 it can be an integer denoting the length of a string. */
3336 {
3337 /* Try to determine the range of lengths the source string
3338 refers to. If it can be determined and is less than
3339 the upper bound given by MAXREAD add one to it for
3340 the terminating nul. Otherwise, set it to one for
3341 the same reason, or to MAXREAD as appropriate. */
3344 {
3347 else
3358 }
3359 else
3360 {
3363 }
3364 }
3365 else
3367 }
3370 {
3371 /* When the only available piece of data is the object size
3372 there is nothing to do. */
3376 /* Otherwise, when the length of the source sequence is known
3377 (as with strlen), set DSTWRITE to it. */
3380 }
3390 /* First check the number of bytes to be written against the maximum
3391 object size. */
3395 {
3405 "%K%qD specified size %E "
3408 else
3410 "%K%qD specified size between %E and %E "
3418 }
3420 /* The number of bytes to write is "exact" if DSTWRITE is non-null,
3421 constant, and in range of unsigned HOST_WIDE_INT. */
3424 /* Next check the number of bytes to be written against the destination
3425 object size. */
3427 {
3432 || (dstwrite
3435 {
3443 {
3444 /* This is a call to strcpy with a destination of 0 size
3445 and a source of unknown length. The call will write
3446 at least one byte past the end of the destination. */
3448 "%K%qD writing %E or more bytes into a region "
3451 }
3454 "%K%qD writing %E byte into a region "
3456 "%K%qD writing %E bytes into a region "
3460 {
3461 /* Avoid printing the upper bound if it's invalid. */
3463 "%K%qD writing %E or more bytes into a region "
3466 }
3467 else
3469 "%K%qD writing between %E and %E bytes into "
3472 dstsize);
3474 /* Return error when an overflow has been detected. */
3476 }
3477 }
3479 /* Check the maximum length of the source sequence against the size
3480 of the destination object if known, or against the maximum size
3481 of an object. */
3483 {
3486 /* Use the lower end for MAXREAD from now on. */
3491 {
3496 {
3500 /* Warn about crazy big sizes first since that's more
3501 likely to be meaningful than saying that the bound
3502 is greater than the object size if both are big. */
3505 "%K%qD specified bound %E "
3509 else
3511 "%K%qD specified bound between %E and %E "
3517 }
3520 {
3526 "%K%qD specified bound %E "
3530 else
3532 "%K%qD specified bound between %E and %E "
3537 }
3538 }
3539 }
3541 /* Check for reading past the end of SRC. */
3546 {
3558 {
3559 /* Avoid printing the upper bound if it's invalid. */
3561 "%K%qD reading %E or more bytes from a region "
3564 }
3565 else
3567 "%K%qD reading between %E and %E bytes from a region "
3571 }
3574 }
3576 /* Helper to compute the size of the object referenced by the DEST
3577 expression which must have pointer type, using Object Size type
3578 OSTYPE (only the least significant 2 bits are used). Return
3579 an estimate of the size of the object if successful or NULL when
3580 the size cannot be determined. When the referenced object involves
3581 a non-constant offset in some range the returned value represents
3582 the largest size given the smallest non-negative offset in the
3583 range. The function is intended for diagnostics and should not
3584 be used to influence code generation or optimization. */
3586 tree
3588 {
3591 /* Only the two least significant bits are meaningful. */
3598 {
3607 {
3608 /* compute_builtin_object_size fails for addresses with
3609 non-constant offsets. Try to determine the range of
3610 such an offset here and use it to adjust the constant
3611 size. */
3614 {
3616 {
3620 /* Ignore negative offsets for now. For others,
3621 use the lower bound as the most optimistic
3622 estimate of the (remaining) size. */
3624 ;
3628 else
3630 }
3631 }
3634 {
3639 {
3641 {
3644 /* Ignore negative offsets for now. For others,
3645 use the lower bound as the most optimistic
3646 estimate of the (remaining)size. */
3648 ;
3652 else
3654 }
3655 }
3656 }
3657 }
3660 }
3662 /* Unless computing the largest size (for memcpy and other raw memory
3663 functions), try to determine the size of the object from its type. */
3678 {
3679 /* Return the constant size unless it's zero (that's a zero-length
3680 array likely at the end of a struct). */
3685 }
3688 }
3690 /* Helper to determine and check the sizes of the source and the destination
3691 of calls to __builtin_{bzero,memcpy,mempcpy,memset} calls. EXP is the
3692 call expression, DEST is the destination argument, SRC is the source
3693 argument or null, and LEN is the number of bytes. Use Object Size type-0
3694 regardless of the OPT_Wstringop_overflow_ setting. Return true on success
3695 (no overflow or invalid sizes), false otherwise. */
3697 static bool
3699 {
3700 /* For functions like memset and memcpy that operate on raw memory
3701 try to determine the size of the largest source and destination
3702 object using type-0 Object Size regardless of the object size
3703 type specified by the option. */
3709 }
3711 /* Validate memchr arguments without performing any expansion.
3712 Return NULL_RTX. */
3714 static rtx
3716 {
3724 /* Diagnose calls where the specified length exceeds the size
3725 of the object. */
3727 {
3731 }
3734 }
3736 /* Expand a call EXP to the memcpy builtin.
3737 Return NULL_RTX if we failed, the caller should emit a normal call,
3738 otherwise try to get the result in TARGET, if convenient (and in
3739 mode MODE if that's convenient). */
3741 static rtx
3743 {
3756 }
3758 /* Check a call EXP to the memmove built-in for validity.
3759 Return NULL_RTX on both success and failure. */
3761 static rtx
3763 {
3775 }
3777 /* Expand a call EXP to the mempcpy builtin.
3778 Return NULL_RTX if we failed; the caller should emit a normal call,
3779 otherwise try to get the result in TARGET, if convenient (and in
3780 mode MODE if that's convenient). */
3782 static rtx
3784 {
3793 /* Policy does not generally allow using compute_objsize (which
3794 is used internally by check_memop_size) to change code generation
3795 or drive optimization decisions.
3797 In this instance it is safe because the code we generate has
3798 the same semantics regardless of the return value of
3799 check_memop_sizes. Exactly the same amount of data is copied
3800 and the return value is exactly the same in both cases.
3802 Furthermore, check_memop_size always uses mode 0 for the call to
3803 compute_objsize, so the imprecise nature of compute_objsize is
3804 avoided. */
3806 /* Avoid expanding mempcpy into memcpy when the call is determined
3807 to overflow the buffer. This also prevents the same overflow
3808 from being diagnosed again when expanding memcpy. */
3814 }
3816 /* Helper function to do the actual work for expand of memory copy family
3817 functions (memcpy, mempcpy, stpcpy). Expansing should assign LEN bytes
3818 of memory from SRC to DEST and assign to TARGET if convenient. Return
3819 value is based on RETMODE argument. */
3821 static rtx
3824 {
3835 /* If DEST is not a pointer type, call the normal function. */
3839 /* If either SRC is not a pointer type, don't do this
3840 operation in-line. */
3857 /* If SRC is a string constant and block move would be done
3858 by pieces, we can avoid loading the string from memory
3859 and only stored the computed constants. */
3866 {
3868 builtin_memcpy_read_str,
3874 }
3879 /* Copy word part most expediently. */
3893 {
3896 }
3899 {
3901 /* stpcpy pointer to last byte. */
3904 }
3907 }
3909 static rtx
3912 {
3914 retmode);
3915 }
3917 /* Expand into a movstr instruction, if one is available. Return NULL_RTX if
3918 we failed, the caller should emit a normal call, otherwise try to
3919 get the result in TARGET, if convenient.
3920 Return value is based on RETMODE argument. */
3922 static rtx
3924 {
3926 rtx dest_mem;
3927 rtx src_mem;
3935 {
3938 }
3947 {
3949 /* movstr is supposed to set end to the address of the NUL
3950 terminator. If the caller requested a mempcpy-like return value,
3951 adjust it. */
3953 {
3957 }
3958 }
3960 }
3962 /* Do some very basic size validation of a call to the strcpy builtin
3963 given by EXP. Return NULL_RTX to have the built-in expand to a call
3964 to the library function. */
3966 static rtx
3968 {
3976 /* There is no way here to determine the length of the string in
3977 the destination to which the SRC string is being appended so
3978 just diagnose cases when the souce string is longer than
3979 the destination object. */
3984 destsize);
3987 }
3989 /* Expand expression EXP, which is a call to the strcpy builtin. Return
3990 NULL_RTX if we failed the caller should emit a normal call, otherwise
3991 try to get the result in TARGET, if convenient (and in mode MODE if that's
3992 convenient). */
3994 static rtx
3996 {
4004 {
4008 }
4011 {
4012 /* Check to see if the argument was declared attribute nonstring
4013 and if so, issue a warning since at this point it's not known
4014 to be nul-terminated. */
4018 }
4021 }
4023 /* Helper function to do the actual work for expand_builtin_strcpy. The
4024 arguments to the builtin_strcpy call DEST and SRC are broken out
4025 so that this can also be called without constructing an actual CALL_EXPR.
4026 The other arguments and return value are the same as for
4027 expand_builtin_strcpy. */
4029 static rtx
4031 {
4032 /* Detect strcpy calls with unterminated arrays.. */
4034 {
4035 /* NONSTR refers to the non-nul terminated constant array. */
4039 }
4042 }
4044 /* Expand a call EXP to the stpcpy builtin.
4045 Return NULL_RTX if we failed the caller should emit a normal call,
4046 otherwise try to get the result in TARGET, if convenient (and in
4047 mode MODE if that's convenient). */
4049 static rtx
4051 {
4062 {
4066 }
4068 /* If return value is ignored, transform stpcpy into strcpy. */
4070 {
4074 }
4075 else
4076 {
4078 rtx ret;
4080 /* Ensure we get an actual string whose length can be evaluated at
4081 compile-time, not an expression containing a string. This is
4082 because the latter will potentially produce pessimized code
4083 when used to produce the return value. */
4084 c_strlen_data data;
4103 {
4107 {
4111 {
4113 {
4116 else
4118 }
4127 }
4128 }
4129 }
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,
4379 RETURN_BEGIN);
4383 }
4384 }
4386 }
4388 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
4389 bytes from constant string DATA + OFFSET and return it as target
4390 constant. */
4392 rtx
4394 scalar_int_mode mode)
4395 {
4402 }
4404 /* Callback routine for store_by_pieces. Return the RTL of a register
4405 containing GET_MODE_SIZE (MODE) consecutive copies of the unsigned
4406 char value given in the RTL register data. For example, if mode is
4407 4 bytes wide, return the RTL for 0x01010101*data. */
4409 static rtx
4411 scalar_int_mode mode)
4412 {
4428 }
4430 /* Expand expression EXP, which is a call to the memset builtin. Return
4431 NULL_RTX if we failed the caller should emit a normal call, otherwise
4432 try to get the result in TARGET, if convenient (and in mode MODE if that's
4433 convenient). */
4435 static rtx
4437 {
4449 }
4451 /* Helper function to do the actual work for expand_builtin_memset. The
4452 arguments to the builtin_memset call DEST, VAL, and LEN are broken out
4453 so that this can also be called without constructing an actual CALL_EXPR.
4454 The other arguments and return value are the same as for
4455 expand_builtin_memset. */
4457 static rtx
4460 {
4463 machine_mode val_mode;
4475 /* If DEST is not a pointer type, don't do this operation in-line. */
4486 /* If the LEN parameter is zero, return DEST. */
4488 {
4489 /* Evaluate and ignore VAL in case it has side-effects. */
4492 }
4494 /* Stabilize the arguments in case we fail. */
4506 {
4507 rtx val_rtx;
4512 /* Assume that we can memset by pieces if we can store
4513 * the coefficients by pieces (in the required modes).
4514 * We can't pass builtin_memset_gen_str as that emits RTL. */
4520 {
4525 }
4529 probable_max_size))
4535 }
4541 {
4548 RETURN_BEGIN);
4553 probable_max_size))
4559 }
4567 probable_max_size);
4570 {
4573 }
4577 do_libcall:
4586 else
4591 }
4593 /* Expand expression EXP, which is a call to the bzero builtin. Return
4594 NULL_RTX if we failed the caller should emit a normal call. */
4596 static rtx
4598 {
4607 /* New argument list transforming bzero(ptr x, int y) to
4608 memset(ptr x, int 0, size_t y). This is done this way
4609 so that if it isn't expanded inline, we fallback to
4610 calling bzero instead of memset. */
4618 }
4620 /* Try to expand cmpstr operation ICODE with the given operands.
4621 Return the result rtx on success, otherwise return null. */
4623 static rtx
4625 HOST_WIDE_INT align)
4626 {
4640 }
4642 /* Expand expression EXP, which is a call to the memcmp built-in function.
4643 Return NULL_RTX if we failed and the caller should emit a normal call,
4644 otherwise try to get the result in TARGET, if convenient.
4645 RESULT_EQ is true if we can relax the returned value to be either zero
4646 or nonzero, without caring about the sign. */
4648 static rtx
4650 {
4661 /* Diagnose calls where the specified length exceeds the size of either
4662 object. */
4668 {
4673 }
4675 /* If the specified length exceeds the size of either object,
4676 call the function. */
4680 /* Due to the performance benefit, always inline the calls first
4681 when result_eq is false. */
4685 {
4689 }
4697 /* If we don't have POINTER_TYPE, call the function. */
4705 /* Set MEM_SIZE as appropriate. */
4707 {
4710 }
4716 {
4720 }
4722 /* If SRC is a string constant and block move would be done
4723 by pieces, we can avoid loading the string from memory
4724 and only stored the computed constants. */
4736 {
4737 /* Return the value in the proper mode for this function. */
4742 {
4745 }
4748 }
4751 }
4753 /* Expand expression EXP, which is a call to the strcmp builtin. Return NULL_RTX
4754 if we failed the caller should emit a normal call, otherwise try to get
4755 the result in TARGET, if convenient. */
4757 static rtx
4759 {
4763 /* Due to the performance benefit, always inline the calls first. */
4780 /* If we don't have POINTER_TYPE, call the function. */
4784 /* Stabilize the arguments in case gen_cmpstr(n)si fail. */
4791 /* Try to call cmpstrsi. */
4796 /* Try to determine at least one length and call cmpstrnsi. */
4798 {
4799 tree len;
4800 rtx arg3_rtx;
4810 /* If we don't have a constant length for the first, use the length
4811 of the second, if we know it. We don't require a constant for
4812 this case; some cost analysis could be done if both are available
4813 but neither is constant. For now, assume they're equally cheap,
4814 unless one has side effects. If both strings have constant lengths,
4815 use the smaller. */
4831 else
4834 /* If both arguments have side effects, we cannot optimize. */
4836 {
4838 result = expand_cmpstrn_or_cmpmem
4841 }
4842 }
4846 {
4847 /* Check to see if the argument was declared attribute nonstring
4848 and if so, issue a warning since at this point it's not known
4849 to be nul-terminated. */
4852 /* Return the value in the proper mode for this function. */
4860 }
4862 /* Expand the library call ourselves using a stabilized argument
4863 list to avoid re-evaluating the function's arguments twice. */
4868 }
4870 /* Expand expression EXP, which is a call to the strncmp builtin. Return
4871 NULL_RTX if we failed the caller should emit a normal call, otherwise try to get
4872 the result in TARGET, if convenient. */
4874 static rtx
4876 ATTRIBUTE_UNUSED machine_mode mode)
4877 {
4882 /* Due to the performance benefit, always inline the calls first. */
4888 /* If c_strlen can determine an expression for one of the string
4889 lengths, and it doesn't have side effects, then emit cmpstrnsi
4890 using length MIN(strlen(string)+1, arg3). */
4895 tree len;
4916 /* If we don't have a constant length for the first, use the length
4917 of the second, if we know it. If neither string is constant length,
4918 use the given length argument. We don't require a constant for
4919 this case; some cost analysis could be done if both are available
4920 but neither is constant. For now, assume they're equally cheap,
4921 unless one has side effects. If both strings have constant lengths,
4922 use the smaller. */
4940 else
4943 /* If we are not using the given length, we must incorporate it here.
4944 The actual new length parameter will be MIN(len,arg3) in this case. */
4946 {
4949 }
4959 {
4960 /* Check to see if the argument was declared attribute nonstring
4961 and if so, issue a warning since at this point it's not known
4962 to be nul-terminated. */
4965 /* Return the value in the proper mode for this function. */
4973 }
4975 /* Expand the library call ourselves using a stabilized argument
4976 list to avoid re-evaluating the function's arguments twice. */
4981 }
4983 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
4984 if that's convenient. */
4986 rtx
4988 {
4989 rtx val;
4992 /* Don't do __builtin_saveregs more than once in a function.
4993 Save the result of the first call and reuse it. */
4997 /* When this function is called, it means that registers must be
4998 saved on entry to this function. So we migrate the call to the
4999 first insn of this function. */
5003 /* Do whatever the machine needs done in this case. */
5011 /* Put the insns after the NOTE that starts the function. If this
5012 is inside a start_sequence, make the outer-level insn chain current, so
5013 the code is placed at the start of the function. */
5019 }
5021 /* Expand a call to __builtin_next_arg. */
5023 static rtx
5025 {
5026 /* Checking arguments is already done in fold_builtin_next_arg
5027 that must be called before this function. */
5032 }
5034 /* Make it easier for the backends by protecting the valist argument
5035 from multiple evaluations. */
5037 static tree
5039 {
5042 /* The current way of determining the type of valist is completely
5043 bogus. We should have the information on the va builtin instead. */
5048 {
5052 /* For this case, the backends will be expecting a pointer to
5053 vatype, but it's possible we've actually been given an array
5054 (an actual TARGET_CANONICAL_VA_LIST_TYPE (valist)).
5055 So fix it. */
5057 {
5060 }
5061 }
5062 else
5063 {
5067 {
5073 }
5079 }
5082 }
5084 /* The "standard" definition of va_list is void*. */
5086 tree
5088 {
5090 }
5092 /* The "standard" abi va_list is va_list_type_node. */
5094 tree
5096 {
5098 }
5100 /* The "standard" type of va_list is va_list_type_node. */
5102 tree
5104 {
5111 {
5112 /* If va_list is an array type, the argument may have decayed
5113 to a pointer type, e.g. by being passed to another function.
5114 In that case, unwrap both types so that we can compare the
5115 underlying records. */
5118 {
5121 }
5122 }
5127 }
5129 /* The "standard" implementation of va_start: just assign `nextarg' to
5130 the variable. */
5132 void
5134 {
5137 }
5139 /* Expand EXP, a call to __builtin_va_start. */
5141 static rtx
5143 {
5144 rtx nextarg;
5145 tree valist;
5149 {
5152 }
5162 else
5166 }
5168 /* Expand EXP, a call to __builtin_va_end. */
5170 static rtx
5172 {
5175 /* Evaluate for side effects, if needed. I hate macros that don't
5176 do that. */
5181 }
5183 /* Expand EXP, a call to __builtin_va_copy. We do this as a
5184 builtin rather than just as an assignment in stdarg.h because of the
5185 nastiness of array-type va_list types. */
5187 static rtx
5189 {
5202 {
5206 }
5207 else
5208 {
5211 /* Evaluate to pointers. */
5220 /* "Dereference" to BLKmode memories. */
5228 /* Copy. */
5230 }
5233 }
5235 /* Expand a call to one of the builtin functions __builtin_frame_address or
5236 __builtin_return_address. */
5238 static rtx
5240 {
5241 /* The argument must be a nonnegative integer constant.
5242 It counts the number of frames to scan up the stack.
5243 The value is either the frame pointer value or the return
5244 address saved in that frame. */
5246 /* Warning about missing arg was already issued. */
5249 {
5252 }
5253 else
5254 {
5255 /* Number of frames to scan up the stack. */
5260 /* Some ports cannot access arbitrary stack frames. */
5262 {
5265 }
5268 {
5269 /* Warn since no effort is made to ensure that any frame
5270 beyond the current one exists or can be safely reached. */
5273 }
5275 /* For __builtin_frame_address, return what we've got. */
5283 }
5284 }
5286 /* Expand EXP, a call to the alloca builtin. Return NULL_RTX if we
5287 failed and the caller should emit a normal call. */
5289 static rtx
5291 {
5292 rtx op0;
5293 rtx result;
5296 HOST_WIDE_INT max_size;
5299 bool valid_arglist
5302 VOID_TYPE)
5313 || (!alloca_for_var
5316 ))
5317 {
5318 /* -Walloca-larger-than and -Wvla-larger-than settings of
5319 less than HOST_WIDE_INT_MAX override the more general
5320 -Walloc-size-larger-than so unless either of the former
5321 options is smaller than the last one (wchich would imply
5322 that the call was already checked), check the alloca
5323 arguments for overflow. */
5327 }
5329 /* Compute the argument. */
5332 /* Compute the alignment. */
5334 ? BIGGEST_ALIGNMENT
5337 /* Compute the maximum size. */
5342 /* Allocate the desired space. If the allocation stems from the declaration
5343 of a variable-sized object, it cannot accumulate. */
5344 result
5349 }
5351 /* Emit a call to __asan_allocas_unpoison call in EXP. Add to second argument
5352 of the call virtual_stack_dynamic_rtx - stack_pointer_rtx, which is the
5353 STACK_DYNAMIC_OFFSET value. See motivation for this in comment to
5354 handle_builtin_stack_restore function. */
5356 static rtx
5358 {
5365 OPTAB_LIB_WIDEN);
5368 OPTAB_LIB_WIDEN);
5373 }
5375 /* Expand a call to bswap builtin in EXP.
5376 Return NULL_RTX if a normal call should be emitted rather than expanding the
5377 function in-line. If convenient, the result should be placed in TARGET.
5378 SUBTARGET may be used as the target for computing one of EXP's operands. */
5380 static rtx
5382 rtx subtarget)
5383 {
5384 tree arg;
5385 rtx op0;
5403 }
5405 /* Expand a call to a unary builtin in EXP.
5406 Return NULL_RTX if a normal call should be emitted rather than expanding the
5407 function in-line. If convenient, the result should be placed in TARGET.
5408 SUBTARGET may be used as the target for computing one of EXP's operands. */
5410 static rtx
5413 {
5414 rtx op0;
5419 /* Compute the argument. */
5421 (subtarget
5425 /* Compute op, into TARGET if possible.
5426 Set TARGET to wherever the result comes back. */
5432 }
5434 /* Expand a call to __builtin_expect. We just return our argument
5435 as the builtin_expect semantic should've been already executed by
5436 tree branch prediction pass. */
5438 static rtx
5440 {
5441 tree arg;
5448 /* When guessing was done, the hints should be already stripped away. */
5452 }
5454 /* Expand a call to __builtin_expect_with_probability. We just return our
5455 argument as the builtin_expect semantic should've been already executed by
5456 tree branch prediction pass. */
5458 static rtx
5460 {
5461 tree arg;
5468 /* When guessing was done, the hints should be already stripped away. */
5472 }
5475 /* Expand a call to __builtin_assume_aligned. We just return our first
5476 argument as the builtin_assume_aligned semantic should've been already
5477 executed by CCP. */
5479 static rtx
5481 {
5485 EXPAND_NORMAL);
5490 }
5492 void
5494 {
5496 {
5498 /* For trap insns when not accumulating outgoing args force
5499 REG_ARGS_SIZE note to prevent crossjumping of calls with
5500 different args sizes. */
5503 }
5504 else
5505 {
5509 }
5512 }
5514 /* Expand a call to __builtin_unreachable. We do nothing except emit
5515 a barrier saying that control flow will not pass here.
5517 It is the responsibility of the program being compiled to ensure
5518 that control flow does never reach __builtin_unreachable. */
5519 static void
5521 {
5523 }
5525 /* Expand EXP, a call to fabs, fabsf or fabsl.
5526 Return NULL_RTX if a normal call should be emitted rather than expanding
5527 the function inline. If convenient, the result should be placed
5528 in TARGET. SUBTARGET may be used as the target for computing
5529 the operand. */
5531 static rtx
5533 {
5534 machine_mode mode;
5535 tree arg;
5536 rtx op0;
5546 }
5548 /* Expand EXP, a call to copysign, copysignf, or copysignl.
5549 Return NULL is a normal call should be emitted rather than expanding the
5550 function inline. If convenient, the result should be placed in TARGET.
5551 SUBTARGET may be used as the target for computing the operand. */
5553 static rtx
5555 {
5557 tree arg;
5569 }
5571 /* Expand a call to __builtin___clear_cache. */
5573 static rtx
5575 {
5577 {
5578 #ifdef CLEAR_INSN_CACHE
5579 /* There is no "clear_cache" insn, and __clear_cache() in libgcc
5580 does something. Just do the default expansion to a call to
5581 __clear_cache(). */
5583 #else
5584 /* There is no "clear_cache" insn, and __clear_cache() in libgcc
5585 does nothing. There is no need to call it. Do nothing. */
5588 }
5590 /* We have a "clear_cache" insn, and it will handle everything. */
5594 /* We must not expand to a library call. If we did, any
5595 fallback library function in libgcc that might contain a call to
5596 __builtin___clear_cache() would recurse infinitely. */
5598 {
5601 }
5604 {
5617 }
5619 }
5621 /* Given a trampoline address, make sure it satisfies TRAMPOLINE_ALIGNMENT. */
5623 static rtx
5625 {
5628 /* If we don't need too much alignment, we'll have been guaranteed
5629 proper alignment by get_trampoline_type. */
5633 /* Round address up to desired boundary. */
5644 }
5646 static rtx
5648 {
5664 /* If ONSTACK, the TRAMP argument should be the address of a field
5665 within the local function's FRAME decl. Either way, let's see if
5666 we can fill in the MEM_ATTRs for this memory. */
5670 /* Creator of a heap trampoline is responsible for making sure the
5671 address is aligned to at least STACK_BOUNDARY. Normally malloc
5672 will ensure this anyhow. */
5675 {
5679 }
5681 /* The FUNC argument should be the address of the nested function.
5682 Extract the actual function decl to pass to the hook. */
5689 /* Generate insns to initialize the trampoline. */
5693 {
5699 }
5702 }
5704 static rtx
5706 {
5707 rtx tramp;
5718 }
5720 /* Expand a call to the builtin descriptor initialization routine.
5721 A descriptor is made up of a couple of pointers to the static
5722 chain and the code entry in this order. */
5724 static rtx
5726 {
5731 VOID_TYPE))
5745 /* Generate insns to initialize the descriptor. */
5751 }
5753 /* Expand a call to the builtin descriptor adjustment routine. */
5755 static rtx
5757 {
5758 rtx tramp;
5765 /* Unalign the descriptor to allow runtime identification. */
5770 }
5772 /* Expand the call EXP to the built-in signbit, signbitf or signbitl
5773 function. The function first checks whether the back end provides
5774 an insn to implement signbit for the respective mode. If not, it
5775 checks whether the floating point format of the value is such that
5776 the sign bit can be extracted. If that is not the case, error out.
5777 EXP is the expression that is a call to the builtin function; if
5778 convenient, the result should be placed in TARGET. */
5779 static rtx
5781 {
5783 scalar_float_mode fmode;
5785 tree arg;
5788 rtx temp;
5801 /* Expand the argument yielding a RTX expression. */
5804 /* Check if the back end provides an insn that handles signbit for the
5805 argument's mode. */
5808 {
5814 }
5816 /* For floating point formats without a sign bit, implement signbit
5817 as "ARG < 0.0". */
5820 {
5821 /* But we can't do this if the format supports signed zero. */
5827 }
5830 {
5833 }
5834 else
5835 {
5837 /* Handle targets with different FP word orders. */
5840 else
5844 }
5846 /* Force the intermediate word_mode (or narrower) result into a
5847 register. This avoids attempting to create paradoxical SUBREGs
5848 of floating point modes below. */
5851 /* If the bitpos is within the "result mode" lowpart, the operation
5852 can be implement with a single bitwise AND. Otherwise, we need
5853 a right shift and an AND. */
5856 {
5864 }
5865 else
5866 {
5867 /* Perform a logical right shift to place the signbit in the least
5868 significant bit, then truncate the result to the desired mode
5869 and mask just this bit. */
5874 }
5877 }
5879 /* Expand fork or exec calls. TARGET is the desired target of the
5880 call. EXP is the call. FN is the
5881 identificator of the actual function. IGNORE is nonzero if the
5882 value is to be ignored. */
5884 static rtx
5886 {
5888 tree call;
5890 /* If we are not profiling, just call the function. */
5894 /* Otherwise call the wrapper. This should be equivalent for the rest of
5895 compiler, so the code does not diverge, and the wrapper may run the
5896 code necessary for keeping the profiling sane. */
5899 {
5930 }
5942 }
5945 \f
5946 /* Reconstitute a mode for a __sync intrinsic operation. Since the type of
5947 the pointer in these functions is void*, the tree optimizers may remove
5948 casts. The mode computed in expand_builtin isn't reliable either, due
5949 to __sync_bool_compare_and_swap.
5951 FCODE_DIFF should be fcode - base, where base is the FOO_1 code for the
5952 group of builtins. This gives us log2 of the mode size. */
5956 {
5957 /* The size is not negotiable, so ask not to get BLKmode in return
5958 if the target indicates that a smaller size would be better. */
5960 }
5962 /* Expand the memory expression LOC and return the appropriate memory operand
5963 for the builtin_sync operations. */
5965 static rtx
5967 {
5977 /* Note that we explicitly do not want any alias information for this
5978 memory, so that we kill all other live memories. Otherwise we don't
5979 satisfy the full barrier semantics of the intrinsic. */
5986 /* The alignment needs to be at least according to that of the mode. */
5993 }
5995 /* Make sure an argument is in the right mode.
5996 EXP is the tree argument.
5997 MODE is the mode it should be in. */
5999 static rtx
6001 {
6002 rtx val;
6003 machine_mode old_mode;
6006 /* If VAL is promoted to a wider mode, convert it back to MODE. Take care
6007 of CONST_INTs, where we know the old_mode only from the call argument. */
6014 }
6017 /* Expand the __sync_xxx_and_fetch and __sync_fetch_and_xxx intrinsics.
6018 EXP is the CALL_EXPR. CODE is the rtx code
6019 that corresponds to the arithmetic or logical operation from the name;
6020 an exception here is that NOT actually means NAND. TARGET is an optional
6021 place for us to store the results; AFTER is true if this is the
6022 fetch_and_xxx form. */
6024 static rtx
6027 rtx target)
6028 {
6033 {
6040 {
6069 }
6070 }
6072 /* Expand the operands. */
6077 after);
6078 }
6080 /* Expand the __sync_val_compare_and_swap and __sync_bool_compare_and_swap
6081 intrinsics. EXP is the CALL_EXPR. IS_BOOL is
6082 true if this is the boolean form. TARGET is a place for us to store the
6083 results; this is NOT optional if IS_BOOL is true. */
6085 static rtx
6088 {
6092 /* Expand the operands. */
6099 {
6102 else
6104 }
6107 MEMMODEL_SYNC_SEQ_CST))
6111 }
6113 /* Expand the __sync_lock_test_and_set intrinsic. Note that the most
6114 general form is actually an atomic exchange, and some targets only
6115 support a reduced form with the second argument being a constant 1.
6116 EXP is the CALL_EXPR; TARGET is an optional place for us to store
6117 the results. */
6119 static rtx
6121 rtx target)
6122 {
6125 /* Expand the operands. */
6130 }
6132 /* Expand the __sync_lock_release intrinsic. EXP is the CALL_EXPR. */
6134 static void
6136 {
6137 rtx mem;
6139 /* Expand the operands. */
6143 }
6145 /* Given an integer representing an ``enum memmodel'', verify its
6146 correctness and return the memory model enum. */
6148 static enum memmodel
6150 {
6151 rtx op;
6153 location_t loc
6156 /* If the parameter is not a constant, it's a run time value so we'll just
6157 convert it to MEMMODEL_SEQ_CST to avoid annoying runtime checking. */
6167 {
6171 }
6173 /* Should never see a user explicit SYNC memodel model, so >= LAST works. */
6175 {
6179 }
6181 /* Workaround for Bugzilla 59448. GCC doesn't track consume properly, so
6182 be conservative and promote consume to acquire. */
6187 }
6189 /* Expand the __atomic_exchange intrinsic:
6190 TYPE __atomic_exchange (TYPE *object, TYPE desired, enum memmodel)
6191 EXP is the CALL_EXPR.
6192 TARGET is an optional place for us to store the results. */
6194 static rtx
6196 {
6205 /* Expand the operands. */
6210 }
6212 /* Expand the __atomic_compare_exchange intrinsic:
6213 bool __atomic_compare_exchange (TYPE *object, TYPE *expect,
6214 TYPE desired, BOOL weak,
6215 enum memmodel success,
6216 enum memmodel failure)
6217 EXP is the CALL_EXPR.
6218 TARGET is an optional place for us to store the results. */
6220 static rtx
6222 rtx target)
6223 {
6227 tree weak;
6229 location_t loc
6236 {
6238 "failure memory model cannot be stronger than success "
6241 }
6244 {
6246 "invalid failure memory model for "
6250 }
6256 /* Expand the operands. */
6272 /* Lest the rtl backend create a race condition with an imporoper store
6273 to memory, always create a new pseudo for OLDVAL. */
6280 /* Conditionally store back to EXPECT, lest we create a race condition
6281 with an improper store to memory. */
6282 /* ??? With a rearrangement of atomics at the gimple level, we can handle
6283 the normal case where EXPECT is totally private, i.e. a register. At
6284 which point the store can be unconditional. */
6292 }
6294 /* Helper function for expand_ifn_atomic_compare_exchange - expand
6295 internal ATOMIC_COMPARE_EXCHANGE call into __atomic_compare_exchange_N
6296 call. The weak parameter must be dropped to match the expected parameter
6297 list and the expected argument changed from value to pointer to memory
6298 slot. */
6300 static void
6302 {
6318 /* Skip the boolean weak parameter. */
6321 /* At present we only have BUILT_IN_ATOMIC_COMPARE_EXCHANGE_{1,2,4,8,16}. */
6324 built_in_function fncode
6329 fndecl);
6334 {
6341 }
6342 }
6344 /* Expand IFN_ATOMIC_COMPARE_EXCHANGE internal function. */
6346 void
6348 {
6354 tree lhs;
6356 location_t loc
6363 {
6365 "failure memory model cannot be stronger than success "
6368 }
6371 {
6373 "invalid failure memory model for "
6377 }
6380 {
6383 }
6385 /* Expand the operands. */
6398 {
6401 }
6405 {
6411 }
6412 }
6414 /* Expand the __atomic_load intrinsic:
6415 TYPE __atomic_load (TYPE *object, enum memmodel)
6416 EXP is the CALL_EXPR.
6417 TARGET is an optional place for us to store the results. */
6419 static rtx
6421 {
6422 rtx mem;
6427 {
6428 location_t loc
6433 }
6438 /* Expand the operand. */
6442 }
6445 /* Expand the __atomic_store intrinsic:
6446 void __atomic_store (TYPE *object, TYPE desired, enum memmodel)
6447 EXP is the CALL_EXPR.
6448 TARGET is an optional place for us to store the results. */
6450 static rtx
6452 {
6459 {
6460 location_t loc
6465 }
6470 /* Expand the operands. */
6475 }
6477 /* Expand the __atomic_fetch_XXX intrinsic:
6478 TYPE __atomic_fetch_XXX (TYPE *object, TYPE val, enum memmodel)
6479 EXP is the CALL_EXPR.
6480 TARGET is an optional place for us to store the results.
6481 CODE is the operation, PLUS, MINUS, ADD, XOR, or IOR.
6482 FETCH_AFTER is true if returning the result of the operation.
6483 FETCH_AFTER is false if returning the value before the operation.
6484 IGNORE is true if the result is not used.
6485 EXT_CALL is the correct builtin for an external call if this cannot be
6486 resolved to an instruction sequence. */
6488 static rtx
6492 {
6495 tree fndecl;
6496 tree addr;
6500 /* Expand the operands. */
6504 /* Only try generating instructions if inlining is turned on. */
6506 {
6510 }
6512 /* Return if a different routine isn't needed for the library call. */
6516 /* Change the call to the specified function. */
6524 /* If we will emit code after the call, the call can not be a tail call.
6525 If it is emitted as a tail call, a barrier is emitted after it, and
6526 then all trailing code is removed. */
6530 /* Expand the call here so we can emit trailing code. */
6533 /* Replace the original function just in case it matters. */
6536 /* Then issue the arithmetic correction to return the right result. */
6538 {
6540 {
6542 OPTAB_LIB_WIDEN);
6544 }
6545 else
6547 OPTAB_LIB_WIDEN);
6548 }
6550 }
6552 /* Expand IFN_ATOMIC_BIT_TEST_AND_* internal function. */
6554 void
6556 {
6564 optab optab;
6576 {
6591 }
6594 {
6601 }
6623 {
6628 }
6629 else
6631 OPTAB_DIRECT);
6634 }
6636 /* Expand an atomic clear operation.
6637 void _atomic_clear (BOOL *obj, enum memmodel)
6638 EXP is the call expression. */
6640 static rtx
6642 {
6643 machine_mode mode;
6652 {
6653 location_t loc
6658 }
6660 /* Try issuing an __atomic_store, and allow fallback to __sync_lock_release.
6661 Failing that, a store is issued by __atomic_store. The only way this can
6662 fail is if the bool type is larger than a word size. Unlikely, but
6663 handle it anyway for completeness. Assume a single threaded model since
6664 there is no atomic support in this case, and no barriers are required. */
6669 }
6671 /* Expand an atomic test_and_set operation.
6672 bool _atomic_test_and_set (BOOL *obj, enum memmodel)
6673 EXP is the call expression. */
6675 static rtx
6677 {
6678 rtx mem;
6680 machine_mode mode;
6687 }
6690 /* Return true if (optional) argument ARG1 of size ARG0 is always lock free on
6691 this architecture. If ARG1 is NULL, use typical alignment for size ARG0. */
6693 static tree
6695 {
6697 machine_mode mode;
6703 /* We need a corresponding integer mode for the access to be lock-free. */
6711 {
6714 /* Either this argument is null, or it's a fake pointer encoding
6715 the alignment of the object. */
6721 else
6723 }
6724 else
6725 {
6728 /* This function is usually invoked and folded immediately by the front
6729 end before anything else has a chance to look at it. The pointer
6730 parameter at this point is usually cast to a void *, so check for that
6731 and look past the cast. */
6741 /* Get the underlying type of the object. */
6744 }
6746 /* If the object has smaller alignment, the lock free routines cannot
6747 be used. */
6751 /* Check if a compare_and_swap pattern exists for the mode which represents
6752 the required size. The pattern is not allowed to fail, so the existence
6753 of the pattern indicates support is present. Also require that an
6754 atomic load exists for the required size. */
6757 else
6759 }
6761 /* Return true if the parameters to call EXP represent an object which will
6762 always generate lock free instructions. The first argument represents the
6763 size of the object, and the second parameter is a pointer to the object
6764 itself. If NULL is passed for the object, then the result is based on
6765 typical alignment for an object of the specified size. Otherwise return
6766 false. */
6768 static rtx
6770 {
6771 tree size;
6776 {
6779 }
6785 }
6787 /* Return a one or zero if it can be determined that object ARG1 of size ARG
6788 is lock free on this architecture. */
6790 static tree
6792 {
6796 /* If it isn't always lock free, don't generate a result. */
6801 }
6803 /* Return true if the parameters to call EXP represent an object which will
6804 always generate lock free instructions. The first argument represents the
6805 size of the object, and the second parameter is a pointer to the object
6806 itself. If NULL is passed for the object, then the result is based on
6807 typical alignment for an object of the specified size. Otherwise return
6808 NULL*/
6810 static rtx
6812 {
6813 tree size;
6818 {
6821 }
6826 /* If the value is known at compile time, return the RTX for it. */
6832 }
6834 /* Expand the __atomic_thread_fence intrinsic:
6835 void __atomic_thread_fence (enum memmodel)
6836 EXP is the CALL_EXPR. */
6838 static void
6840 {
6843 }
6845 /* Expand the __atomic_signal_fence intrinsic:
6846 void __atomic_signal_fence (enum memmodel)
6847 EXP is the CALL_EXPR. */
6849 static void
6851 {
6854 }
6856 /* Expand the __sync_synchronize intrinsic. */
6858 static void
6860 {
6862 }
6864 static rtx
6866 {
6872 {
6874 /* If the target is not sutitable then create a new target. */
6882 }
6885 }
6887 static void
6889 {
6895 {
6902 }
6904 }
6906 \f
6907 /* Emit code to restore the current value of stack. */
6909 static void
6911 {
6923 }
6925 /* Emit code to save the current value of stack. */
6927 static rtx
6929 {
6934 }
6936 /* Emit code to get the openacc gang, worker or vector id or size. */
6938 static rtx
6940 {
6942 rtx fallback_retval;
6945 {
6958 }
6961 {
6964 }
6968 {
6971 }
6975 {
6983 }
6992 {
6995 }
7003 }
7005 /* Expand a string compare operation using a sequence of char comparison
7006 to get rid of the calling overhead, with result going to TARGET if
7007 that's convenient.
7009 VAR_STR is the variable string source;
7010 CONST_STR is the constant string source;
7011 LENGTH is the number of chars to compare;
7012 CONST_STR_N indicates which source string is the constant string;
7013 IS_MEMCMP indicates whether it's a memcmp or strcmp.
7015 to: (assume const_str_n is 2, i.e., arg2 is a constant string)
7017 target = (int) (unsigned char) var_str[0]
7018 - (int) (unsigned char) const_str[0];
7019 if (target != 0)
7020 goto ne_label;
7021 ...
7022 target = (int) (unsigned char) var_str[length - 2]
7023 - (int) (unsigned char) const_str[length - 2];
7024 if (target != 0)
7025 goto ne_label;
7026 target = (int) (unsigned char) var_str[length - 1]
7027 - (int) (unsigned char) const_str[length - 1];
7028 ne_label:
7029 */
7031 static rtx
7035 {
7037 rtx var_rtx_array
7044 scalar_int_mode unit_mode
7050 {
7051 var_rtx
7065 }
7073 }
7075 /* Inline expansion a call to str(n)cmp, with result going to
7076 TARGET if that's convenient.
7077 If the call is not been inlined, return NULL_RTX. */
7078 static rtx
7080 {
7086 /* Do NOT apply this inlining expansion when optimizing for size or
7087 optimization level below 2. */
7095 /* On a target where the type of the call (int) has same or narrower presicion
7096 than unsigned char, give up the inlining expansion. */
7112 /* If neither strings is constant string, the call is not qualify. */
7116 /* For strncmp, if the length is not a const, not qualify. */
7127 else
7136 /* If the length of the comparision is larger than the threshold,
7137 do nothing. */
7144 /* Now, start inline expansion the call. */
7148 }
7150 /* Expand a call to __builtin_speculation_safe_value_<N>. MODE
7151 represents the size of the first argument to that call, or VOIDmode
7152 if the argument is a pointer. IGNORE will be true if the result
7153 isn't used. */
7154 static rtx
7157 {
7164 {
7167 }
7171 /* An optional second argument can be used as a failsafe value on
7172 some machines. If it isn't present, then the failsafe value is
7173 assumed to be 0. */
7175 {
7178 }
7179 else
7182 /* If the result isn't used, the behavior is undefined. It would be
7183 nice to emit a warning here, but path splitting means this might
7184 happen with legitimate code. So simply drop the builtin
7185 expansion in that case; we've handled any side-effects above. */
7189 /* If we don't have a suitable target, create one to hold the result. */
7197 }
7199 /* Expand an expression EXP that calls a built-in function,
7200 with result going to TARGET if that's convenient
7201 (and in mode MODE if that's convenient).
7202 SUBTARGET may be used as the target for computing one of EXP's operands.
7203 IGNORE is nonzero if the value is to be ignored. */
7205 rtx
7208 {
7217 /* When ASan is enabled, we don't want to expand some memory/string
7218 builtins and rely on libsanitizer's hooks. This allows us to avoid
7219 redundant checks and be sure, that possible overflow will be detected
7220 by ASan. */
7225 /* When not optimizing, generate calls to library functions for a certain
7226 set of builtins. */
7240 /* The built-in function expanders test for target == const0_rtx
7241 to determine whether the function's result will be ignored. */
7245 /* If the result of a pure or const built-in function is ignored, and
7246 none of its arguments are volatile, we can avoid expanding the
7247 built-in call and just evaluate the arguments for side-effects. */
7251 {
7253 tree arg;
7254 call_expr_arg_iterator iter;
7258 {
7261 }
7264 {
7268 }
7269 }
7272 {
7290 /* Just do a normal library call if we were unable to fold
7291 the values. */
7368 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
7369 FUNCTION with a copy of the parameters described by
7370 ARGUMENTS, and ARGSIZE. It returns a block of memory
7371 allocated on the stack into which is stored all the registers
7372 that might possibly be used for returning the result of a
7373 function. ARGUMENTS is the value returned by
7374 __builtin_apply_args. ARGSIZE is the number of bytes of
7375 arguments that must be copied. ??? How should this value be
7376 computed? We'll also need a safe worst case value for varargs
7377 functions. */
7384 else
7385 {
7393 }
7395 /* __builtin_return (RESULT) causes the function to return the
7396 value described by RESULT. RESULT is address of the block of
7397 memory returned by __builtin_apply. */
7407 /* All valid uses of __builtin_va_arg_pack () are removed during
7408 inlining. */
7413 /* All valid uses of __builtin_va_arg_pack_len () are removed during
7414 inlining. */
7418 /* Return the address of the first anonymous stack arg. */
7440 /* Returns the address of the area where the structure is returned.
7441 0 otherwise. */
7447 else
7450 CASE_BUILT_IN_ALLOCA:
7600 /* Expand it as BUILT_IN_MEMCMP_EQ first. If not successful, change it
7601 back to a BUILT_IN_STRCMP. Remember to delete the 3rd paramater
7602 when changing it to a strcmp call. */
7608 /* Change this call back to a BUILT_IN_STRCMP. */
7612 /* Delete the last parameter. */
7619 /* FALLTHROUGH */
7627 /* Expand it as BUILT_IN_MEMCMP_EQ first. If not successful, change it
7628 back to a BUILT_IN_STRNCMP. */
7634 /* Change it back to a BUILT_IN_STRNCMP. */
7637 /* FALLTHROUGH */
7652 {
7655 }
7659 /* This should have been lowered to the builtins below. */
7663 /* __builtin_setjmp_setup is passed a pointer to an array of five words
7664 and the receiver label. */
7666 {
7672 /* This is copied from the handling of non-local gotos. */
7674 nonlocal_goto_handler_labels
7676 nonlocal_goto_handler_labels);
7677 /* ??? Do not let expand_label treat us as such since we would
7678 not want to be both on the list of non-local labels and on
7679 the list of forced labels. */
7682 }
7686 /* __builtin_setjmp_receiver is passed the receiver label. */
7688 {
7694 }
7697 /* __builtin_longjmp is passed a pointer to an array of five words.
7698 It's similar to the C library longjmp function but works with
7699 __builtin_setjmp above. */
7702 {
7708 {
7711 }
7715 }
7724 /* This updates the setjmp buffer that is its argument with the value
7725 of the current stack pointer. */
7728 {
7729 rtx buf_addr
7734 }
7754 /* Various hooks for the DWARF 2 __throw routine. */
7760 #ifdef DWARF2_UNWIND_INFO
7766 #endif
7968 mode = get_builtin_sync_mode
7980 mode = get_builtin_sync_mode
8027 {
8031 mode =
8037 /* If this is turned into an external library call, the weak parameter
8038 must be dropped to match the expected parameter list. */
8043 /* Skip the boolean weak parameter. */
8048 }
8077 {
8087 }
8093 {
8103 }
8109 {
8119 }
8125 {
8135 }
8141 {
8151 }
8157 {
8167 }
8304 /* Do library call, if we failed to expand the builtin when
8305 folding. */
8325 }
8327 /* The switch statement above can drop through to cause the function
8328 to be called normally. */
8330 }
8332 /* Determine whether a tree node represents a call to a built-in
8333 function. If the tree T is a call to a built-in function with
8334 the right number of arguments of the appropriate types, return
8335 the DECL_FUNCTION_CODE of the call, e.g. BUILT_IN_SQRT.
8336 Otherwise the return value is END_BUILTINS. */
8338 enum built_in_function
8340 {
8343 const_call_expr_arg_iterator iter;
8355 {
8356 /* If a function doesn't take a variable number of arguments,
8357 the last element in the list will have type `void'. */
8360 {
8364 }
8373 {
8376 }
8378 {
8381 }
8383 {
8386 }
8388 {
8391 }
8392 else
8394 }
8396 /* Variable-length argument list. */
8398 }
8400 /* Fold a call to __builtin_constant_p, if we know its argument ARG will
8401 evaluate to a constant. */
8403 static tree
8405 {
8406 /* We return 1 for a numeric type that's known to be a constant
8407 value at compile-time or for an aggregate type that's a
8408 literal constant. */
8411 /* If we know this is a constant, emit the constant of one. */
8417 {
8424 }
8426 /* If this expression has side effects, show we don't know it to be a
8427 constant. Likewise if it's a pointer or aggregate type since in
8428 those case we only want literals, since those are only optimized
8429 when generating RTL, not later.
8430 And finally, if we are compiling an initializer, not code, we
8431 need to return a definite result now; there's not going to be any
8432 more optimization done. */
8437 || folding_initializer
8442 }
8444 /* Create builtin_expect or builtin_expect_with_probability
8445 with PRED and EXPECTED as its arguments and return it as a truthvalue.
8446 Fortran FE can also produce builtin_expect with PREDICTOR as third argument.
8447 builtin_expect_with_probability instead uses third argument as PROBABILITY
8448 value. */
8450 static tree
8453 {
8468 else
8470 predictor);
8474 }
8476 /* Fold a call to builtin_expect with arguments ARG0, ARG1, ARG2, ARG3. Return
8477 NULL_TREE if no simplification is possible. */
8479 tree
8481 tree arg3)
8482 {
8486 /* Distribute the expected value over short-circuiting operators.
8487 See through the cast from truthvalue_type_node to long. */
8494 /* If this is a builtin_expect within a builtin_expect keep the
8495 inner one. See through a comparison against a constant. It
8496 might have been added to create a thruthvalue. */
8512 {
8522 }
8524 /* If the argument isn't invariant then there's nothing else we can do. */
8528 /* If we expect that a comparison against the argument will fold to
8529 a constant return the constant. In practice, this means a true
8530 constant or the address of a non-weak symbol. */
8534 {
8535 do
8536 {
8538 }
8543 }
8545 /* Otherwise, ARG0 already has the proper type for the return value. */
8547 }
8549 /* Fold a call to __builtin_classify_type with argument ARG. */
8551 static tree
8553 {
8558 }
8560 /* Fold a call to __builtin_strlen with argument ARG. */
8562 static tree
8564 {
8567 else
8568 {
8569 c_strlen_data data;
8580 {
8586 }
8589 }
8590 }
8592 /* Fold a call to __builtin_inf or __builtin_huge_val. */
8594 static tree
8596 {
8597 REAL_VALUE_TYPE real;
8599 /* __builtin_inff is intended to be usable to define INFINITY on all
8600 targets. If an infinity is not available, INFINITY expands "to a
8601 positive constant of type float that overflows at translation
8602 time", footnote "In this case, using INFINITY will violate the
8603 constraint in 6.4.4 and thus require a diagnostic." (C99 7.12#4).
8604 Thus we pedwarn to ensure this constraint violation is
8605 diagnosed. */
8611 }
8613 /* Fold function call to builtin sincos, sincosf, or sincosl. Return
8614 NULL_TREE if no simplification can be made. */
8616 static tree
8619 {
8620 tree type;
8630 /* Calculate the result when the argument is a constant. */
8635 /* Canonicalize sincos to cexpi. */
8637 {
8640 }
8642 {
8649 }
8661 }
8663 /* Fold function call to builtin memcmp with arguments ARG1 and ARG2.
8664 Return NULL_TREE if no simplification can be made. */
8666 static tree
8668 {
8674 /* If the LEN parameter is zero, return zero. */
8679 /* If ARG1 and ARG2 are the same (and not volatile), return zero. */
8683 /* If len parameter is one, return an expression corresponding to
8684 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
8686 {
8688 tree cst_uchar_ptr_node
8691 tree ind1
8695 cst_uchar_ptr_node,
8696 arg1)));
8697 tree ind2
8701 cst_uchar_ptr_node,
8702 arg2)));
8704 }
8707 }
8709 /* Fold a call to builtin isascii with argument ARG. */
8711 static tree
8713 {
8716 else
8717 {
8718 /* Transform isascii(c) -> ((c & ~0x7f) == 0). */
8724 }
8725 }
8727 /* Fold a call to builtin toascii with argument ARG. */
8729 static tree
8731 {
8735 /* Transform toascii(c) -> (c & 0x7f). */
8738 }
8740 /* Fold a call to builtin isdigit with argument ARG. */
8742 static tree
8744 {
8747 else
8748 {
8749 /* Transform isdigit(c) -> (unsigned)(c) - '0' <= 9. */
8750 /* According to the C standard, isdigit is unaffected by locale.
8751 However, it definitely is affected by the target character set. */
8752 unsigned HOST_WIDE_INT target_digit0
8763 }
8764 }
8766 /* Fold a call to fabs, fabsf or fabsl with argument ARG. */
8768 static tree
8770 {
8776 }
8778 /* Fold a call to abs, labs, llabs or imaxabs with argument ARG. */
8780 static tree
8782 {
8788 }
8790 /* Fold a call to builtin carg(a+bi) -> atan2(b,a). */
8792 static tree
8794 {
8797 {
8801 {
8806 }
8807 }
8810 }
8812 /* Fold a call to builtin frexp, we can assume the base is 2. */
8814 static tree
8816 {
8827 /* Proceed if a valid pointer type was passed in. */
8829 {
8834 {
8836 /* For +-0, return (*exp = 0, +-0). */
8842 /* For +-NaN or +-Inf, *exp is unspecified, return arg0. */
8845 {
8846 /* Since the frexp function always expects base 2, and in
8847 GCC normalized significands are already in the range
8848 [0.5, 1.0), we have exactly what frexp wants. */
8853 }
8857 }
8859 /* Create the COMPOUND_EXPR (*arg1 = trunc, frac). */
8863 }
8866 }
8868 /* Fold a call to builtin modf. */
8870 static tree
8872 {
8883 /* Proceed if a valid pointer type was passed in. */
8885 {
8890 {
8893 /* For +-NaN or +-0, return (*arg1 = arg0, arg0). */
8897 /* For +-Inf, return (*arg1 = arg0, +-0). */
8903 /* Return (*arg1 = trunc(arg0), arg0-trunc(arg0)). */
8906 /* If the original number was negative and already
8907 integral, then the fractional part is -0.0. */
8911 }
8913 /* Create the COMPOUND_EXPR (*arg1 = trunc, frac). */
8919 }
8922 }
8924 /* Given a location LOC, an interclass builtin function decl FNDECL
8925 and its single argument ARG, return an folded expression computing
8926 the same, or NULL_TREE if we either couldn't or didn't want to fold
8927 (the latter happen if there's an RTL instruction available). */
8929 static tree
8931 {
8932 machine_mode mode;
8944 /* If there is no optab, try generic code. */
8946 {
8947 tree result;
8950 {
8951 /* isinf(x) -> isgreater(fabs(x),DBL_MAX). */
8954 REAL_VALUE_TYPE r;
8958 {
8959 /* NaN and Inf are encoded in the high-order double value
8960 only. The low-order value is not significant. */
8964 }
8971 }
8974 {
8975 /* isfinite(x) -> islessequal(fabs(x),DBL_MAX). */
8978 REAL_VALUE_TYPE r;
8982 {
8983 /* NaN and Inf are encoded in the high-order double value
8984 only. The low-order value is not significant. */
8988 }
8994 /*result = fold_build2_loc (loc, UNGT_EXPR,
8995 TREE_TYPE (TREE_TYPE (fndecl)),
8996 fold_build1_loc (loc, ABS_EXPR, type, arg),
8997 build_real (type, r));
8998 result = fold_build1_loc (loc, TRUTH_NOT_EXPR,
8999 TREE_TYPE (TREE_TYPE (fndecl)),
9000 result);*/
9002 }
9004 {
9005 /* isnormal(x) -> isgreaterequal(fabs(x),DBL_MIN) &
9006 islessequal(fabs(x),DBL_MAX). */
9016 {
9017 /* Use double to test the normal range of IBM extended
9018 precision. Emin for IBM extended precision is
9019 different to emin for IEEE double, being 53 higher
9020 since the low double exponent is at least 53 lower
9021 than the high double exponent. */
9025 }
9037 {
9038 /* Testing the high end of the range is done just using
9039 the high double, using the same test as isfinite().
9040 For the subnormal end of the range we first test the
9041 high double, then if its magnitude is equal to the
9042 limit of 0x1p-969, we test whether the low double is
9043 non-zero and opposite sign to the high double. */
9059 integer_type_node,
9065 }
9066 else
9067 {
9068 tree const isge_fn
9071 }
9075 }
9078 }
9081 }
9083 /* Fold a call to __builtin_isnan(), __builtin_isinf, __builtin_finite.
9084 ARG is the argument for the call. */
9086 static tree
9088 {
9095 {
9103 {
9104 /* isinf_sign(x) -> isinf(x) ? (signbit(x) ? -1 : 1) : 0 */
9105 /* In a boolean context, GCC will fold the inner COND_EXPR to
9106 1. So e.g. "if (isinf_sign(x))" would be folded to just
9107 "if (isinf(x) ? 1 : 0)" which becomes "if (isinf(x))". */
9115 {
9128 integer_zero_node);
9129 }
9132 }
9145 {
9148 {
9149 /* NaN and Inf are encoded in the high-order double value
9150 only. The low-order value is not significant. */
9152 }
9153 }
9159 }
9160 }
9162 /* Fold a call to __builtin_fpclassify(int, int, int, int, int, ...).
9163 This builtin will generate code to return the appropriate floating
9164 point classification depending on the value of the floating point
9165 number passed in. The possible return values must be supplied as
9166 int arguments to the call in the following order: FP_NAN, FP_INFINITE,
9167 FP_NORMAL, FP_SUBNORMAL and FP_ZERO. The ellipses is for exactly
9168 one floating point argument which is "type generic". */
9170 static tree
9172 {
9175 machine_mode mode;
9176 REAL_VALUE_TYPE r;
9179 /* Verify the required arguments in the original call. */
9199 /* fpclassify(x) ->
9200 isnan(x) ? FP_NAN :
9201 (fabs(x) == Inf ? FP_INFINITE :
9202 (fabs(x) >= DBL_MIN ? FP_NORMAL :
9203 (x == 0 ? FP_ZERO : FP_SUBNORMAL))). */
9217 {
9223 }
9226 {
9229 }
9232 }
9234 /* Fold a call to an unordered comparison function such as
9235 __builtin_isgreater(). FNDECL is the FUNCTION_DECL for the function
9236 being called and ARG0 and ARG1 are the arguments for the call.
9237 UNORDERED_CODE and ORDERED_CODE are comparison codes that give
9238 the opposite of the desired result. UNORDERED_CODE is used
9239 for modes that can hold NaNs and ORDERED_CODE is used for
9240 the rest. */
9242 static tree
9246 {
9260 /* Choose the wider of two real types. */
9272 {
9276 }
9281 }
9283 /* Fold __builtin_{,s,u}{add,sub,mul}{,l,ll}_overflow, either into normal
9284 arithmetics if it can never overflow, or into internal functions that
9285 return both result of arithmetics and overflowed boolean flag in
9286 a complex integer result, or some other check for overflow.
9287 Similarly fold __builtin_{add,sub,mul}_overflow_p to just the overflow
9288 checking part of that. */
9290 static tree
9293 {
9295 /* The code of the expression corresponding to the type-generic
9296 built-in, or ERROR_MARK for the type-specific ones. */
9301 {
9304 /* FALLTHRU */
9307 /* FALLTHRU */
9318 /* FALLTHRU */
9321 /* FALLTHRU */
9332 /* FALLTHRU */
9335 /* FALLTHRU */
9346 }
9348 /* For the "generic" overloads, the first two arguments can have different
9349 types and the last argument determines the target type to use to check
9350 for overflow. The arguments of the other overloads all have the same
9351 type. */
9354 /* For the __builtin_{add,sub,mul}_overflow_p builtins, when the first two
9355 arguments are constant, attempt to fold the built-in call into a constant
9356 expression indicating whether or not it detected an overflow. */
9360 /* Perform the computation in the target type and check for overflow. */
9364 arg2);
9378 tree store
9381 }
9383 /* Fold a call to __builtin_FILE to a constant string. */
9387 {
9389 {
9390 /* The documentation says this builtin is equivalent to the preprocessor
9391 __FILE__ macro so it appears appropriate to use the same file prefix
9392 mappings. */
9395 }
9398 }
9400 /* Fold a call to __builtin_FUNCTION to a constant string. */
9404 {
9411 }
9413 /* Fold a call to __builtin_LINE to an integer constant. */
9417 {
9419 }
9421 /* Fold a call to built-in function FNDECL with 0 arguments.
9422 This function returns NULL_TREE if no simplification was possible. */
9424 static tree
9426 {
9430 {
9456 }
9458 }
9460 /* Fold a call to built-in function FNDECL with 1 argument, ARG0.
9461 This function returns NULL_TREE if no simplification was possible. */
9463 static tree
9465 {
9476 {
9478 {
9481 /* Gimplification will pull the CALL_EXPR for the builtin out of
9482 an if condition. When not optimizing, we'll not CSE it back.
9483 To avoid link error types of regressions, return false now. */
9488 }
9544 {
9549 }
9555 {
9560 }
9581 }
9585 }
9587 /* Fold a call to built-in function FNDECL with 2 arguments, ARG0 and ARG1.
9588 This function returns NULL_TREE if no simplification was possible. */
9590 static tree
9592 {
9604 {
9648 NOP_EXPR);
9650 /* We do the folding for va_start in the expander. */
9665 }
9667 }
9669 /* Fold a call to built-in function FNDECL with 3 arguments, ARG0, ARG1,
9670 and ARG2.
9671 This function returns NULL_TREE if no simplification was possible. */
9673 static tree
9676 {
9690 {
9739 }
9741 }
9743 /* Fold a call to built-in function FNDECL. ARGS is an array of NARGS
9744 arguments. IGNORE is true if the result of the
9745 function call is ignored. This function returns NULL_TREE if no
9746 simplification was possible. */
9748 tree
9750 {
9754 {
9770 }
9772 {
9776 }
9778 }
9780 /* Construct a new CALL_EXPR to FNDECL using the tail of the argument
9781 list ARGS along with N new arguments in NEWARGS. SKIP is the number
9782 of arguments in ARGS to be omitted. OLDNARGS is the number of
9783 elements in ARGS. */
9785 static tree
9788 {
9793 {
9801 }
9802 else
9806 }
9808 /* Return true if FNDECL shouldn't be folded right now.
9809 If a built-in function has an inline attribute always_inline
9810 wrapper, defer folding it after always_inline functions have
9811 been inlined, otherwise e.g. -D_FORTIFY_SOURCE checking
9812 might not be performed. */
9814 bool
9816 {
9819 && cfun
9822 }
9824 /* A wrapper function for builtin folding that prevents warnings for
9825 "statement without effect" and the like, caused by removing the
9826 call node earlier than the warning is generated. */
9828 tree
9830 {
9834 /* If CALL_EXPR_VA_ARG_PACK is set, the arguments aren't finalized
9835 yet. Defer folding until we see all the arguments
9836 (after inlining). */
9838 {
9841 /* Before gimplification CALL_EXPR_VA_ARG_PACK is not set, but
9842 instead last argument is __builtin_va_arg_pack (). Defer folding
9843 even in that case, until arguments are finalized. */
9845 {
9849 }
9857 else
9858 {
9863 }
9864 }
9866 }
9868 /* Fold a CALL_EXPR with type TYPE with FN as the function expression.
9869 N arguments are passed in the array ARGARRAY. Return a folded
9870 expression or NULL_TREE if no simplification was possible. */
9872 tree
9874 tree fn,
9877 {
9884 {
9885 /* If last argument is __builtin_va_arg_pack (), arguments to this
9886 function are not finalized yet. Defer folding until they are. */
9888 {
9892 }
9897 else
9899 }
9902 }
9904 /* Construct a new CALL_EXPR using the tail of the argument list of EXP
9905 along with N new arguments specified as the "..." parameters. SKIP
9906 is the number of arguments in EXP to be omitted. This function is used
9907 to do varargs-to-varargs transformations. */
9909 static tree
9911 {
9913 tree t;
9921 }
9923 /* Validate a single argument ARG against a tree code CODE representing
9924 a type. Return true when argument is valid. */
9926 static bool
9928 {
9936 }
9938 /* This function validates the types of a function call argument list
9939 against a specified list of tree_codes. If the last specifier is a 0,
9940 that represents an ellipses, otherwise the last specifier must be a
9941 VOID_TYPE.
9943 This is the GIMPLE version of validate_arglist. Eventually we want to
9944 completely convert builtins.c to work from GIMPLEs and the tree based
9945 validate_arglist will then be removed. */
9947 bool
9949 {
9953 const_tree arg;
9959 do
9960 {
9963 {
9965 /* This signifies an ellipses, any further arguments are all ok. */
9969 /* This signifies an endlink, if no arguments remain, return
9970 true, otherwise return false. */
9974 /* If no parameters remain or the parameter's code does not
9975 match the specified code, return false. Otherwise continue
9976 checking any remaining arguments. */
9981 }
9982 }
9985 /* We need gotos here since we can only have one VA_CLOSE in a
9986 function. */
9987 end: ;
9991 }
9993 /* Default target-specific builtin expander that does nothing. */
9995 rtx
9997 rtx target ATTRIBUTE_UNUSED,
9998 rtx subtarget ATTRIBUTE_UNUSED,
9999 machine_mode mode ATTRIBUTE_UNUSED,
10001 {
10003 }
10005 /* Returns true is EXP represents data that would potentially reside
10006 in a readonly section. */
10008 bool
10010 {
10020 /* Make sure we call decl_readonly_section only for trees it
10021 can handle (since it returns true for everything it doesn't
10022 understand). */
10027 else
10029 }
10031 /* Simplify a call to the strpbrk builtin. S1 and S2 are the arguments
10032 to the call, and TYPE is its return type.
10034 Return NULL_TREE if no simplification was possible, otherwise return the
10035 simplified form of the call as a tree.
10037 The simplified form may be a constant or other expression which
10038 computes the same value, but in a more efficient manner (including
10039 calls to other builtin functions).
10041 The call may contain arguments which need to be evaluated, but
10042 which are not useful to determine the result of the call. In
10043 this case we return a chain of COMPOUND_EXPRs. The LHS of each
10044 COMPOUND_EXPR will be an argument which must be evaluated.
10045 COMPOUND_EXPRs are chained through their RHS. The RHS of the last
10046 COMPOUND_EXPR in the chain will contain the tree for the simplified
10047 form of the builtin function call. */
10049 static tree
10051 {
10055 else
10056 {
10057 tree fn;
10066 {
10068 tree tem;
10073 /* Return an offset into the constant string argument. */
10076 }
10079 /* strpbrk(x, "") == NULL.
10080 Evaluate and ignore s1 in case it had side-effects. */
10090 /* New argument list transforming strpbrk(s1, s2) to
10091 strchr(s1, s2[0]). */
10094 }
10095 }
10097 /* Simplify a call to the strspn builtin. S1 and S2 are the arguments
10098 to the call.
10100 Return NULL_TREE if no simplification was possible, otherwise return the
10101 simplified form of the call as a tree.
10103 The simplified form may be a constant or other expression which
10104 computes the same value, but in a more efficient manner (including
10105 calls to other builtin functions).
10107 The call may contain arguments which need to be evaluated, but
10108 which are not useful to determine the result of the call. In
10109 this case we return a chain of COMPOUND_EXPRs. The LHS of each
10110 COMPOUND_EXPR will be an argument which must be evaluated.
10111 COMPOUND_EXPRs are chained through their RHS. The RHS of the last
10112 COMPOUND_EXPR in the chain will contain the tree for the simplified
10113 form of the builtin function call. */
10115 static tree
10117 {
10121 else
10122 {
10125 /* If either argument is "", return NULL_TREE. */
10127 /* Evaluate and ignore both arguments in case either one has
10128 side-effects. */
10132 }
10133 }
10135 /* Simplify a call to the strcspn builtin. S1 and S2 are the arguments
10136 to the call.
10138 Return NULL_TREE if no simplification was possible, otherwise return the
10139 simplified form of the call as a tree.
10141 The simplified form may be a constant or other expression which
10142 computes the same value, but in a more efficient manner (including
10143 calls to other builtin functions).
10145 The call may contain arguments which need to be evaluated, but
10146 which are not useful to determine the result of the call. In
10147 this case we return a chain of COMPOUND_EXPRs. The LHS of each
10148 COMPOUND_EXPR will be an argument which must be evaluated.
10149 COMPOUND_EXPRs are chained through their RHS. The RHS of the last
10150 COMPOUND_EXPR in the chain will contain the tree for the simplified
10151 form of the builtin function call. */
10153 static tree
10155 {
10159 else
10160 {
10161 /* If the first argument is "", return NULL_TREE. */
10164 {
10165 /* Evaluate and ignore argument s2 in case it has
10166 side-effects. */
10169 }
10171 /* If the second argument is "", return __builtin_strlen(s1). */
10174 {
10177 /* If the replacement _DECL isn't initialized, don't do the
10178 transformation. */
10183 }
10185 }
10186 }
10188 /* Fold the next_arg or va_start call EXP. Returns true if there was an error
10189 produced. False otherwise. This is done so that we don't output the error
10190 or warning twice or three times. */
10192 bool
10194 {
10197 tree arg;
10198 /* There is good chance the current input_location points inside the
10199 definition of the va_start macro (perhaps on the token for
10200 builtin) in a system header, so warnings will not be emitted.
10201 Use the location in real source code. */
10202 location_t current_location =
10204 NULL);
10207 {
10210 }
10213 {
10215 {
10218 }
10220 }
10221 /* We use __builtin_va_start (ap, 0, 0) or __builtin_next_arg (0, 0)
10222 when we checked the arguments and if needed issued a warning. */
10223 else
10224 {
10226 {
10227 /* Evidently an out of date version of <stdarg.h>; can't validate
10228 va_start's second argument, but can still work as intended. */
10230 OPT_Wvarargs,
10233 }
10235 {
10238 }
10240 }
10245 /* We destructively modify the call to be __builtin_va_start (ap, 0)
10246 or __builtin_next_arg (0) the first time we see it, after checking
10247 the arguments and if needed issuing a warning. */
10249 {
10252 /* Strip off all nops for the sake of the comparison. This
10253 is not quite the same as STRIP_NOPS. It does more.
10254 We must also strip off INDIRECT_EXPR for C++ reference
10255 parameters. */
10260 {
10261 /* FIXME: Sometimes with the tree optimizers we can get the
10262 not the last argument even though the user used the last
10263 argument. We just warn and set the arg to be the last
10264 argument so that we will get wrong-code because of
10265 it. */
10267 OPT_Wvarargs,
10269 }
10271 /* Undefined by C99 7.15.1.4p4 (va_start):
10272 "If the parameter parmN is declared with the register storage
10273 class, with a function or array type, or with a type that is
10274 not compatible with the type that results after application of
10275 the default argument promotions, the behavior is undefined."
10276 */
10278 {
10280 OPT_Wvarargs,
10281 "undefined behavior when second parameter of "
10283 }
10285 /* We want to verify the second parameter just once before the tree
10286 optimizers are run and then avoid keeping it in the tree,
10287 as otherwise we could warn even for correct code like:
10288 void foo (int i, ...)
10289 { va_list ap; i++; va_start (ap, i); va_end (ap); } */
10292 else
10294 }
10296 }
10299 /* Expand a call EXP to __builtin_object_size. */
10301 static rtx
10303 {
10304 tree ost;
10309 {
10314 }
10322 {
10327 }
10332 }
10334 /* Expand EXP, a call to the __mem{cpy,pcpy,move,set}_chk builtin.
10335 FCODE is the BUILT_IN_* to use.
10336 Return NULL_RTX if we failed; the caller should emit a normal call,
10337 otherwise try to get the result in TARGET, if convenient (and in
10338 mode MODE if that's convenient). */
10340 static rtx
10343 {
10345 POINTER_TYPE,
10346 fcode == BUILT_IN_MEMSET_CHK
10363 {
10364 /* Avoid transforming the checking call to an ordinary one when
10365 an overflow has been detected or when the call couldn't be
10366 validated because the size is not constant. */
10371 /* If __builtin_mem{cpy,pcpy,move,set}_chk is used, assume
10372 mem{cpy,pcpy,move,set} is available. */
10374 {
10389 }
10398 }
10401 else
10402 {
10405 /* If DEST is not a pointer type, call the normal function. */
10409 /* If SRC and DEST are the same (and not volatile), do nothing. */
10411 {
10412 tree expr;
10415 {
10416 /* Evaluate and ignore LEN in case it has side-effects. */
10419 }
10423 }
10425 /* __memmove_chk special case. */
10427 {
10433 /* If src is categorized for a readonly section we can use
10434 normal __memcpy_chk. */
10436 {
10445 }
10446 }
10448 }
10449 }
10451 /* Emit warning if a buffer overflow is detected at compile time. */
10453 static void
10455 {
10456 /* The source string. */
10458 /* The size of the destination object. */
10460 /* The string that is being concatenated with (as in __strcat_chk)
10461 or null if it isn't. */
10463 /* The maximum length of the source sequence in a bounded operation
10464 (such as __strncat_chk) or null if the operation isn't bounded
10465 (such as __strcat_chk). */
10467 /* The exact size of the access (such as in __strncpy_chk). */
10471 {
10479 /* For __strcat_chk the warning will be emitted only if overflowing
10480 by at least strlen (dest) + 1 bytes. */
10507 }
10510 {
10511 /* Check __strncat_chk. There is no way to determine the length
10512 of the string to which the source string is being appended so
10513 just warn when the length of the source string is not known. */
10516 }
10518 /* The destination argument is the first one for all built-ins above. */
10522 }
10524 /* Emit warning if a buffer overflow is detected at compile time
10525 in __sprintf_chk/__vsprintf_chk calls. */
10527 static void
10529 {
10534 /* Verify the required arguments in the original call. */
10544 /* Check whether the format is a literal string constant. */
10552 /* If the format doesn't contain % args or %%, we know its size. */
10555 /* If the format is "%s" and first ... argument is a string literal,
10556 we know it too. */
10559 {
10560 tree arg;
10571 }
10572 else
10575 /* Add one for the terminating nul. */
10580 }
10582 /* Emit warning if a free is called with address of a variable. */
10584 static void
10586 {
10600 else
10603 }
10605 /* Fold a call to __builtin_object_size with arguments PTR and OST,
10606 if possible. */
10608 static tree
10610 {
10627 /* __builtin_object_size doesn't evaluate side-effects in its arguments;
10628 if there are any side-effects, it returns (size_t) -1 for types 0 and 1
10629 and (size_t) 0 for types 2 and 3. */
10634 {
10638 }
10640 {
10641 /* If object size is not known yet, delay folding until
10642 later. Maybe subsequent passes will help determining
10643 it. */
10647 }
10650 }
10652 /* Builtins with folding operations that operate on "..." arguments
10653 need special handling; we need to store the arguments in a convenient
10654 data structure before attempting any folding. Fortunately there are
10655 only a few builtins that fall into this category. FNDECL is the
10656 function, EXP is the CALL_EXPR for the call. */
10658 static tree
10660 {
10665 {
10672 }
10674 {
10679 }
10681 }
10683 /* Initialize format string characters in the target charset. */
10685 bool
10687 {
10690 {
10713 }
10715 }
10717 /* Helper function for do_mpfr_arg*(). Ensure M is a normal number
10718 and no overflow/underflow occurred. INEXACT is true if M was not
10719 exactly calculated. TYPE is the tree type for the result. This
10720 function assumes that you cleared the MPFR flags and then
10721 calculated M to see if anything subsequently set a flag prior to
10722 entering this function. Return NULL_TREE if any checks fail. */
10724 static tree
10726 {
10727 /* Proceed iff we get a normal number, i.e. not NaN or Inf and no
10728 overflow/underflow occurred. If -frounding-math, proceed iff the
10729 result of calling FUNC was exact. */
10732 {
10733 REAL_VALUE_TYPE rr;
10736 /* Proceed iff GCC's REAL_VALUE_TYPE can hold the MPFR value,
10737 check for overflow/underflow. If the REAL_VALUE_TYPE is zero
10738 but the mpft_t is not, then we underflowed in the
10739 conversion. */
10742 {
10743 REAL_VALUE_TYPE rmode;
10746 /* Proceed iff the specified mode can hold the value. */
10749 }
10750 }
10752 }
10754 /* Helper function for do_mpc_arg*(). Ensure M is a normal complex
10755 number and no overflow/underflow occurred. INEXACT is true if M
10756 was not exactly calculated. TYPE is the tree type for the result.
10757 This function assumes that you cleared the MPFR flags and then
10758 calculated M to see if anything subsequently set a flag prior to
10759 entering this function. Return NULL_TREE if any checks fail, if
10760 FORCE_CONVERT is true, then bypass the checks. */
10762 static tree
10764 {
10765 /* Proceed iff we get a normal number, i.e. not NaN or Inf and no
10766 overflow/underflow occurred. If -frounding-math, proceed iff the
10767 result of calling FUNC was exact. */
10772 {
10777 /* Proceed iff GCC's REAL_VALUE_TYPE can hold the MPFR values,
10778 check for overflow/underflow. If the REAL_VALUE_TYPE is zero
10779 but the mpft_t is not, then we underflowed in the
10780 conversion. */
10785 {
10790 /* Proceed iff the specified mode can hold the value. */
10796 }
10797 }
10799 }
10801 /* If arguments ARG0 and ARG1 are REAL_CSTs, call mpfr_remquo() to set
10802 the pointer *(ARG_QUO) and return the result. The type is taken
10803 from the type of ARG0 and is used for setting the precision of the
10804 calculation and results. */
10806 static tree
10808 {
10815 /* To proceed, MPFR must exactly represent the target floating point
10816 format, which only happens when the target base equals two. */
10820 {
10825 {
10829 tree result_rem;
10838 /* Remquo is independent of the rounding mode, so pass
10839 inexact=0 to do_mpfr_ckconv(). */
10843 {
10844 /* MPFR calculates quo in the host's long so it may
10845 return more bits in quo than the target int can hold
10846 if sizeof(host long) > sizeof(target int). This can
10847 happen even for native compilers in LP64 mode. In
10848 these cases, modulo the quo value with the largest
10849 number that the target int can hold while leaving one
10850 bit for the sign. */
10854 /* Dereference the quo pointer argument. */
10856 /* Proceed iff a valid pointer type was passed in. */
10858 {
10859 /* Set the value. */
10860 tree result_quo
10863 integer_quo));
10865 /* Combine the quo assignment with the rem. */
10868 }
10869 }
10870 }
10871 }
10873 }
10875 /* If ARG is a REAL_CST, call mpfr_lgamma() on it and return the
10876 resulting value as a tree with type TYPE. The mpfr precision is
10877 set to the precision of TYPE. We assume that this mpfr function
10878 returns zero if the result could be calculated exactly within the
10879 requested precision. In addition, the integer pointer represented
10880 by ARG_SG will be dereferenced and set to the appropriate signgam
10881 (-1,1) value. */
10883 static tree
10885 {
10890 /* To proceed, MPFR must exactly represent the target floating point
10891 format, which only happens when the target base equals two. Also
10892 verify ARG is a constant and that ARG_SG is an int pointer. */
10897 {
10900 /* In addition to NaN and Inf, the argument cannot be zero or a
10901 negative integer. */
10905 {
10910 mpfr_t m;
10911 tree result_lg;
10920 {
10921 tree result_sg;
10923 /* Dereference the arg_sg pointer argument. */
10925 /* Assign the signgam value into *arg_sg. */
10930 /* Combine the signgam assignment with the lgamma result. */
10933 }
10934 }
10935 }
10938 }
10940 /* If arguments ARG0 and ARG1 are a COMPLEX_CST, call the two-argument
10941 mpc function FUNC on it and return the resulting value as a tree
10942 with type TYPE. The mpfr precision is set to the precision of
10943 TYPE. We assume that function FUNC returns zero if the result
10944 could be calculated exactly within the requested precision. If
10945 DO_NONFINITE is true, then fold expressions containing Inf or NaN
10946 in the arguments and/or results. */
10948 tree
10951 {
10957 /* To proceed, MPFR must exactly represent the target floating point
10958 format, which only happens when the target base equals two. */
10964 {
10973 {
10993 }
10994 }
10997 }
10999 /* A wrapper function for builtin folding that prevents warnings for
11000 "statement without effect" and the like, caused by removing the
11001 call node earlier than the warning is generated. */
11003 tree
11005 {
11011 {
11020 {
11022 }
11023 else
11024 {
11027 {
11028 /* Propagate location information from original call to
11029 expansion of builtin. Otherwise things like
11030 maybe_emit_chk_warning, that operate on the expansion
11031 of a builtin, will use the wrong location information. */
11033 {
11041 }
11043 }
11044 }
11045 }
11047 }
11049 /* Look up the function in builtin_decl that corresponds to DECL
11050 and set ASMSPEC as its user assembler name. DECL must be a
11051 function decl that declares a builtin. */
11053 void
11055 {
11064 {
11068 }
11069 }
11071 /* Return true if DECL is a builtin that expands to a constant or similarly
11072 simple code. */
11073 bool
11075 {
11078 {
11079 /* Builtins that expand to constants. */
11084 /* Simple register moves or loads from stack. */
11095 /* Exception state returns or moves registers around. */
11103 }
11106 }
11108 /* Return true if DECL is a builtin that is not expensive, i.e., they are
11109 most probably expanded inline into reasonably simple code. This is a
11110 superset of is_simple_builtin. */
11111 bool
11113 {
11120 {
11122 CASE_BUILT_IN_ALLOCA:
11188 }
11191 }
11193 /* Return true if T is a constant and the value cast to a target char
11194 can be represented by a host char.
11195 Store the casted char constant in *P if so. */
11197 bool
11199 {
11205 }
11207 /* Return the maximum object size. */
11209 tree
11211 {
11212 /* To do: Make this a configurable parameter. */
11214 }