| blob | e2ba356c0d396ce2f6f10237fc5e98b699c8972c |
1 /* Expand builtin functions.
2 Copyright (C) 1988-2019 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
9 version.
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 for more details.
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /* Legacy warning! Please add no further builtin simplifications here
21 (apart from pure constant folding) - builtin simplifications should go
22 to match.pd or gimple-fold.c instead. */
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. */
129 memop_ret retmode);
197 /* Return true if NAME starts with __builtin_ or __sync_. */
199 static bool
201 {
209 }
211 /* Return true if NODE should be considered for inline expansion regardless
212 of the optimization level. This means whenever a function is invoked with
213 its "internal" name, which normally contains the prefix "__builtin". */
215 bool
217 {
218 /* Note that we must use DECL_NAME, not DECL_ASSEMBLER_NAME_SET_P since
219 we want the name used to call the function, not the name it
220 will have. */
223 }
225 /* Compute values M and N such that M divides (address of EXP - N) and such
226 that N < M. If these numbers can be determined, store M in alignp and N in
227 *BITPOSP and return true. Otherwise return false and store BITS_PER_UNIT to
228 *alignp and any bit-offset to *bitposp.
230 Note that the address (and thus the alignment) computed here is based
231 on the address to which a symbol resolves, whereas DECL_ALIGN is based
232 on the address at which an object is actually located. These two
233 addresses are not always the same. For example, on ARM targets,
234 the address &foo of a Thumb function foo() has the lowest bit set,
235 whereas foo() itself starts on an even address.
237 If ADDR_P is true we are taking the address of the memory reference EXP
238 and thus cannot rely on the access taking place. */
240 static bool
243 {
245 tree offset;
246 machine_mode mode;
251 /* Get the innermost object and the constant (bitpos) and possibly
252 variable (offset) offset of the access. */
256 /* Extract alignment information from the innermost object and
257 possibly adjust bitpos and offset. */
259 {
260 /* Function addresses can encode extra information besides their
261 alignment. However, if TARGET_PTRMEMFUNC_VBIT_LOCATION
262 allows the low bit to be used as a virtual bit, we know
263 that the address itself must be at least 2-byte aligned. */
266 }
268 ;
270 {
271 /* The alignment of a CONST_DECL is determined by its initializer. */
278 }
280 {
283 }
287 {
293 /* If the address is explicitely aligned, handle that. */
296 {
301 }
303 known_alignment
307 /* Re-apply explicit alignment to the bitpos. */
310 /* The alignment of the pointer operand in a TARGET_MEM_REF
311 has to take the variable offset parts into account. */
313 {
315 {
320 }
324 }
326 /* When EXP is an actual memory reference then we can use
327 TYPE_ALIGN of a pointer indirection to derive alignment.
328 Do so only if get_pointer_alignment_1 did not reveal absolute
329 alignment knowledge and if using that alignment would
330 improve the situation. */
336 else
337 {
338 /* Else adjust bitpos accordingly. */
343 }
344 }
346 {
347 /* STRING_CST are the only constant objects we allow to be not
348 wrapped inside a CONST_DECL. */
354 }
356 /* If there is a non-constant offset part extract the maximum
357 alignment that can prevail. */
359 {
362 {
366 }
367 }
369 /* Account for the alignment of runtime coefficients, so that the constant
370 bitpos is guaranteed to be accurate. */
373 {
376 }
381 }
383 /* For a memory reference expression EXP compute values M and N such that M
384 divides (&EXP - N) and such that N < M. If these numbers can be determined,
385 store M in alignp and N in *BITPOSP and return true. Otherwise return false
386 and store BITS_PER_UNIT to *alignp and any bit-offset to *bitposp. */
388 bool
391 {
393 }
395 /* Return the alignment in bits of EXP, an object. */
397 unsigned int
399 {
405 /* align and bitpos now specify known low bits of the pointer.
406 ptr & (align - 1) == bitpos. */
411 }
413 /* For a pointer valued expression EXP compute values M and N such that M
414 divides (EXP - N) and such that N < M. If these numbers can be determined,
415 store M in alignp and N in *BITPOSP and return true. Return false if
416 the results are just a conservative approximation.
418 If EXP is not a pointer, false is returned too. */
420 bool
423 {
430 {
437 else
438 {
441 {
445 }
446 }
450 }
453 {
458 {
461 /* Make sure to return a sensible alignment when the multiplication
462 by BITS_PER_UNIT overflowed. */
465 /* We cannot really tell whether this result is an approximation. */
467 }
468 else
469 {
473 }
474 }
476 {
481 }
486 }
488 /* Return the alignment in bits of EXP, a pointer valued expression.
489 The alignment returned is, by default, the alignment of the thing that
490 EXP points to. If it is not a POINTER_TYPE, 0 is returned.
492 Otherwise, look at the expression to see if we can do better, i.e., if the
493 expression is actually pointing at an object whose alignment is tighter. */
495 unsigned int
497 {
503 /* align and bitpos now specify known low bits of the pointer.
504 ptr & (align - 1) == bitpos. */
510 }
512 /* Return the number of leading non-zero elements in the sequence
513 [ PTR, PTR + MAXELTS ) where each element's size is ELTSIZE bytes.
514 ELTSIZE must be a power of 2 less than 8. Used by c_strlen. */
516 unsigned
518 {
524 {
525 /* Optimize the common case of plain char. */
527 {
531 }
532 }
533 else
534 {
536 {
540 }
541 }
543 }
545 /* For a call at LOC to a function FN that expects a string in the argument
546 ARG, issue a diagnostic due to it being a called with an argument
547 declared at NONSTR that is a character array with no terminating NUL. */
549 void
551 {
559 {
563 }
564 }
566 /* If EXP refers to an unterminated constant character array return
567 the declaration of the object of which the array is a member or
568 element and if SIZE is not null, set *SIZE to the size of
569 the unterminated array and set *EXACT if the size is exact or
570 clear it otherwise. Otherwise return null. */
572 tree
574 {
575 /* C_STRLEN will return NULL and set DECL in the info
576 structure if EXP references a unterminated array. */
577 c_strlen_data lendata = { };
580 {
582 {
585 {
586 /* Constant offsets are already accounted for in LENDATA.MINLEN,
587 but not in a SSA_NAME + CST expression. */
592 {
593 /* Subtract the offset from the size of the array. */
598 }
599 else
601 }
602 else
606 }
608 }
611 }
613 /* Compute the length of a null-terminated character string or wide
614 character string handling character sizes of 1, 2, and 4 bytes.
615 TREE_STRING_LENGTH is not the right way because it evaluates to
616 the size of the character array in bytes (as opposed to characters)
617 and because it can contain a zero byte in the middle.
619 ONLY_VALUE should be nonzero if the result is not going to be emitted
620 into the instruction stream and zero if it is going to be expanded.
621 E.g. with i++ ? "foo" : "bar", if ONLY_VALUE is nonzero, constant 3
622 is returned, otherwise NULL, since
623 len = c_strlen (src, 1); if (len) expand_expr (len, ...); would not
624 evaluate the side-effects.
626 If ONLY_VALUE is two then we do not emit warnings about out-of-bound
627 accesses. Note that this implies the result is not going to be emitted
628 into the instruction stream.
630 Additional information about the string accessed may be recorded
631 in DATA. For example, if SRC references an unterminated string,
632 then the declaration will be stored in the DECL field. If the
633 length of the unterminated string can be determined, it'll be
634 stored in the LEN field. Note this length could well be different
635 than what a C strlen call would return.
637 ELTSIZE is 1 for normal single byte character strings, and 2 or
638 4 for wide characer strings. ELTSIZE is by default 1.
640 The value returned is of type `ssizetype'. */
642 tree
644 {
645 /* If we were not passed a DATA pointer, then get one to a local
646 structure. That avoids having to check DATA for NULL before
647 each time we want to use it. */
648 c_strlen_data local_strlen_data = { };
656 {
663 }
671 /* Offset from the beginning of the string in bytes. */
672 tree byteoff;
673 tree memsize;
674 tree decl;
679 /* Determine the size of the string element. */
683 /* Set MAXELTS to sizeof (SRC) / sizeof (*SRC) - 1, the maximum possible
684 length of SRC. Prefer TYPE_SIZE() to TREE_STRING_LENGTH() if possible
685 in case the latter is less than the size of the array, such as when
686 SRC refers to a short string literal used to initialize a large array.
687 In that case, the elements of the array after the terminating NUL are
688 all NUL. */
697 /* PTR can point to the byte representation of any string type, including
698 char* and wchar_t*. */
702 {
703 /* The code below works only for single byte character types. */
707 /* If the string has an internal NUL character followed by any
708 non-NUL characters (e.g., "foo\0bar"), we can't compute
709 the offset to the following NUL if we don't know where to
710 start searching for it. */
713 /* Return when an embedded null character is found or none at all.
714 In the latter case, set the DECL/LEN field in the DATA structure
715 so that callers may examine them. */
719 {
724 }
726 /* For empty strings the result should be zero. */
730 /* We don't know the starting offset, but we do know that the string
731 has no internal zero bytes. If the offset falls within the bounds
732 of the string subtract the offset from the length of the string,
733 and return that. Otherwise the length is zero. Take care to
734 use SAVE_EXPR in case the OFFSET has side-effects. */
741 offsave);
745 }
747 /* Offset from the beginning of the string in elements. */
748 HOST_WIDE_INT eltoff;
750 /* We have a known offset into the string. Start searching there for
751 a null character if we can represent it as a single HOST_WIDE_INT. */
756 else
759 /* If the offset is known to be out of bounds, warn, and call strlen at
760 runtime. */
762 {
763 /* Suppress multiple warnings for propagated constant strings. */
768 eltoff))
771 }
773 /* If eltoff is larger than strelts but less than maxelts the
774 string length is zero, since the excess memory will be zero. */
778 /* Use strlen to search for the first zero byte. Since any strings
779 constructed with build_string will have nulls appended, we win even
780 if we get handed something like (char[4])"abcd".
782 Since ELTOFF is our starting index into the string, no further
783 calculation is needed. */
787 /* Don't know what to return if there was no zero termination.
788 Ideally this would turn into a gcc_checking_assert over time.
789 Set DECL/LEN so callers can examine them. */
791 {
796 }
799 }
801 /* Return a constant integer corresponding to target reading
802 GET_MODE_BITSIZE (MODE) bits from string constant STR. If
803 NULL_TERMINATED_P, reading stops after '\0' character, all further ones
804 are assumed to be zero, otherwise it reads as many characters
805 as needed. */
807 rtx
810 {
811 HOST_WIDE_INT ch;
825 {
837 }
841 }
843 /* Cast a target constant CST to target CHAR and if that value fits into
844 host char type, return zero and put that value into variable pointed to by
845 P. */
847 static int
849 {
856 /* Do not care if it fits or not right here. */
871 }
873 /* Similar to save_expr, but assumes that arbitrary code is not executed
874 in between the multiple evaluations. In particular, we assume that a
875 non-addressable local variable will not be modified. */
877 static tree
879 {
887 }
889 /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
890 times to get the address of either a higher stack frame, or a return
891 address located within it (depending on FNDECL_CODE). */
893 static rtx
895 {
899 {
900 /* For a zero count with __builtin_return_address, we don't care what
901 frame address we return, because target-specific definitions will
902 override us. Therefore frame pointer elimination is OK, and using
903 the soft frame pointer is OK.
905 For a nonzero count, or a zero count with __builtin_frame_address,
906 we require a stable offset from the current frame pointer to the
907 previous one, so we must use the hard frame pointer, and
908 we must disable frame pointer elimination. */
911 else
912 {
915 /* Tell reload not to eliminate the frame pointer. */
917 }
918 }
923 /* On the SPARC, the return address is not in the frame, it is in a
924 register. There is no way to access it off of the current frame
925 pointer, but it can be accessed off the previous frame pointer by
926 reading the value from the register window save area. */
928 count--;
930 /* Scan back COUNT frames to the specified frame. */
932 {
933 /* Assume the dynamic chain pointer is in the word that the
934 frame address points to, unless otherwise specified. */
939 }
941 /* For __builtin_frame_address, return what we've got. But, on
942 the SPARC for example, we may have to add a bias. */
946 /* For __builtin_return_address, get the return address from that frame. */
947 #ifdef RETURN_ADDR_RTX
949 #else
953 #endif
955 }
957 /* Alias set used for setjmp buffer. */
960 /* Construct the leading half of a __builtin_setjmp call. Control will
961 return to RECEIVER_LABEL. This is also called directly by the SJLJ
962 exception handling code. */
964 void
966 {
968 rtx stack_save;
969 rtx mem;
978 /* We store the frame pointer and the address of receiver_label in
979 the buffer and use the rest of it for the stack save area, which
980 is machine-dependent. */
999 /* If there is further processing to do, do it. */
1003 /* We have a nonlocal label. */
1005 }
1007 /* Construct the trailing part of a __builtin_setjmp call. This is
1008 also called directly by the SJLJ exception handling code.
1009 If RECEIVER_LABEL is NULL, instead contruct a nonlocal goto handler. */
1011 void
1013 {
1014 rtx chain;
1016 /* Mark the FP as used when we get here, so we have to make sure it's
1017 marked as used by this function. */
1020 /* Mark the static chain as clobbered here so life information
1021 doesn't get messed up for it. */
1027 {
1028 /* If the argument pointer can be eliminated in favor of the
1029 frame pointer, we don't need to restore it. We assume here
1030 that if such an elimination is present, it can always be used.
1031 This is the case on all known machines; if we don't make this
1032 assumption, we do unnecessary saving on many machines. */
1042 {
1043 /* Now restore our arg pointer from the address at which it
1044 was saved in our stack frame. */
1047 }
1048 }
1054 else
1057 /* We must not allow the code we just generated to be reordered by
1058 scheduling. Specifically, the update of the frame pointer must
1059 happen immediately, not later. */
1061 }
1063 /* __builtin_longjmp is passed a pointer to an array of five words (not
1064 all will be used on all machines). It operates similarly to the C
1065 library function of the same name, but is more efficient. Much of
1066 the code below is copied from the handling of non-local gotos. */
1068 static void
1070 {
1075 /* DRAP is needed for stack realign if longjmp is expanded to current
1076 function */
1087 /* We require that the user must pass a second argument of 1, because
1088 that is what builtin_setjmp will return. */
1094 else
1095 {
1106 /* Pick up FP, label, and SP from the block and jump. This code is
1107 from expand_goto in stmt.c; see there for detailed comments. */
1109 /* We have to pass a value to the nonlocal_goto pattern that will
1110 get copied into the static_chain pointer, but it does not matter
1111 what that value is, because builtin_setjmp does not use it. */
1113 else
1114 {
1120 /* Restore the frame pointer and stack pointer. We must use a
1121 temporary since the setjmp buffer may be a local. */
1125 /* Ensure the frame pointer move is not optimized. */
1134 }
1135 }
1137 /* Search backwards and mark the jump insn as a non-local goto.
1138 Note that this precludes the use of __builtin_longjmp to a
1139 __builtin_setjmp target in the same function. However, we've
1140 already cautioned the user that these functions are for
1141 internal exception handling use only. */
1143 {
1147 {
1150 }
1153 }
1154 }
1158 {
1160 }
1162 /* This function validates the types of a function call argument list
1163 against a specified list of tree_codes. If the last specifier is a 0,
1164 that represents an ellipsis, otherwise the last specifier must be a
1165 VOID_TYPE. */
1167 static bool
1169 {
1173 const_call_expr_arg_iterator iter;
1174 const_tree arg;
1179 /* Get a bitmap of pointer argument numbers declared attribute nonnull. */
1184 {
1188 {
1190 /* This signifies an ellipses, any further arguments are all ok. */
1194 /* This signifies an endlink, if no arguments remain, return
1195 true, otherwise return false. */
1199 /* The actual argument must be nonnull when either the whole
1200 called function has been declared nonnull, or when the formal
1201 argument corresponding to the actual argument has been. */
1204 {
1209 }
1210 /* FALLTHRU */
1212 /* If no parameters remain or the parameter's code does not
1213 match the specified code, return false. Otherwise continue
1214 checking any remaining arguments. */
1219 }
1220 }
1222 /* We need gotos here since we can only have one VA_CLOSE in a
1223 function. */
1224 end: ;
1230 }
1232 /* Expand a call to __builtin_nonlocal_goto. We're passed the target label
1233 and the address of the save area. */
1235 static rtx
1237 {
1252 /* Copy the address of the save location to a register just in case it was
1253 based on the frame pointer. */
1262 /* ??? We no longer need to pass the static chain value, afaik. */
1265 else
1266 {
1272 /* Restore the frame pointer and stack pointer. We must use a
1273 temporary since the setjmp buffer may be a local. */
1277 /* Ensure the frame pointer move is not optimized. */
1283 /* USE of hard_frame_pointer_rtx added for consistency;
1284 not clear if really needed. */
1288 /* If the architecture is using a GP register, we must
1289 conservatively assume that the target function makes use of it.
1290 The prologue of functions with nonlocal gotos must therefore
1291 initialize the GP register to the appropriate value, and we
1292 must then make sure that this value is live at the point
1293 of the jump. (Note that this doesn't necessarily apply
1294 to targets with a nonlocal_goto pattern; they are free
1295 to implement it in their own way. Note also that this is
1296 a no-op if the GP register is a global invariant.) */
1302 }
1304 /* Search backwards to the jump insn and mark it as a
1305 non-local goto. */
1307 {
1309 {
1312 }
1315 }
1318 }
1320 /* __builtin_update_setjmp_buf is passed a pointer to an array of five words
1321 (not all will be used on all machines) that was passed to __builtin_setjmp.
1322 It updates the stack pointer in that block to the current value. This is
1323 also called directly by the SJLJ exception handling code. */
1325 void
1327 {
1330 rtx stack_save
1332 memory_address
1338 }
1340 /* Expand a call to __builtin_prefetch. For a target that does not support
1341 data prefetch, evaluate the memory address argument in case it has side
1342 effects. */
1344 static void
1346 {
1356 /* Arguments 1 and 2 are optional; argument 1 (read/write) defaults to
1357 zero (read) and argument 2 (locality) defaults to 3 (high degree of
1358 locality). */
1362 else
1366 else
1369 /* Argument 0 is an address. */
1372 /* Argument 1 (read/write flag) must be a compile-time constant int. */
1374 {
1377 }
1379 /* Argument 1 must be either zero or one. */
1381 {
1385 }
1387 /* Argument 2 (locality) must be a compile-time constant int. */
1389 {
1392 }
1394 /* Argument 2 must be 0, 1, 2, or 3. */
1396 {
1399 }
1402 {
1410 }
1412 /* Don't do anything with direct references to volatile memory, but
1413 generate code to handle other side effects. */
1416 }
1418 /* Get a MEM rtx for expression EXP which is the address of an operand
1419 to be used in a string instruction (cmpstrsi, cpymemsi, ..). LEN is
1420 the maximum length of the block of memory that might be accessed or
1421 NULL if unknown. */
1423 static rtx
1425 {
1429 /* When EXP is not resolved SAVE_EXPR, MEM_ATTRS can be still derived
1430 from its expression, for expr->a.b only <variable>.a.b is recorded. */
1437 /* Get an expression we can use to find the attributes to assign to MEM.
1438 First remove any nops. */
1443 /* Build a MEM_REF representing the whole accessed area as a byte blob,
1444 (as builtin stringops may alias with anything). */
1451 /* If the MEM_REF has no acceptable address, try to get the base object
1452 from the original address we got, and build an all-aliasing
1453 unknown-sized access to that one. */
1459 {
1464 size_zero_node,
1465 NULL)),
1468 }
1471 }
1472 \f
1473 /* Built-in functions to perform an untyped call and return. */
1475 #define apply_args_mode \
1476 (this_target_builtins->x_apply_args_mode)
1477 #define apply_result_mode \
1478 (this_target_builtins->x_apply_result_mode)
1480 /* Return the size required for the block returned by __builtin_apply_args,
1481 and initialize apply_args_mode. */
1483 static int
1485 {
1490 /* The values computed by this function never change. */
1492 {
1493 /* The first value is the incoming arg-pointer. */
1496 /* The second value is the structure value address unless this is
1497 passed as an "invisible" first argument. */
1503 {
1513 }
1514 else
1515 {
1517 }
1518 }
1520 }
1522 /* Return the size required for the block returned by __builtin_apply,
1523 and initialize apply_result_mode. */
1525 static int
1527 {
1531 /* The values computed by this function never change. */
1533 {
1538 {
1548 }
1549 else
1552 /* Allow targets that use untyped_call and untyped_return to override
1553 the size so that machine-specific information can be stored here. */
1554 #ifdef APPLY_RESULT_SIZE
1556 #endif
1557 }
1559 }
1561 /* Create a vector describing the result block RESULT. If SAVEP is true,
1562 the result block is used to save the values; otherwise it is used to
1563 restore the values. */
1565 static rtx
1567 {
1569 fixed_size_mode mode;
1576 {
1586 }
1588 }
1590 /* Save the state required to perform an untyped call with the same
1591 arguments as were passed to the current function. */
1593 static rtx
1595 {
1598 fixed_size_mode mode;
1599 rtx struct_incoming_value = targetm.calls.struct_value_rtx (cfun ? TREE_TYPE (cfun->decl) : 0, 1);
1601 /* Create a block where the arg-pointer, structure value address,
1602 and argument registers can be saved. */
1605 /* Walk past the arg-pointer and structure value address. */
1610 /* Save each register used in calling a function to the block. */
1613 {
1622 }
1624 /* Save the arg pointer to the block. */
1626 /* We need the pointer as the caller actually passed them to us, not
1627 as we might have pretended they were passed. Make sure it's a valid
1628 operand, as emit_move_insn isn't expected to handle a PLUS. */
1630 tem
1633 NULL_RTX);
1638 /* Save the structure value address unless this is passed as an
1639 "invisible" first argument. */
1644 /* Return the address of the block. */
1646 }
1648 /* __builtin_apply_args returns block of memory allocated on
1649 the stack into which is stored the arg pointer, structure
1650 value address, static chain, and all the registers that might
1651 possibly be used in performing a function call. The code is
1652 moved to the start of the function so the incoming values are
1653 saved. */
1655 static rtx
1657 {
1658 /* Don't do __builtin_apply_args more than once in a function.
1659 Save the result of the first call and reuse it. */
1662 {
1663 /* When this function is called, it means that registers must be
1664 saved on entry to this function. So we migrate the
1665 call to the first insn of this function. */
1666 rtx temp;
1675 /* Put the insns after the NOTE that starts the function.
1676 If this is inside a start_sequence, make the outer-level insn
1677 chain current, so the code is placed at the start of the
1678 function. If internal_arg_pointer is a non-virtual pseudo,
1679 it needs to be placed after the function that initializes
1680 that pseudo. */
1685 else
1689 }
1690 }
1692 /* Perform an untyped call and save the state required to perform an
1693 untyped return of whatever value was returned by the given function. */
1695 static rtx
1697 {
1699 fixed_size_mode mode;
1708 /* Create a block where the return registers can be saved. */
1711 /* Fetch the arg pointer from the ARGUMENTS block. */
1718 /* Push a new argument block and copy the arguments. Do not allow
1719 the (potential) memcpy call below to interfere with our stack
1720 manipulations. */
1722 NO_DEFER_POP;
1724 /* Save the stack with nonlocal if available. */
1727 else
1730 /* Allocate a block of memory onto the stack and copy the memory
1731 arguments to the outgoing arguments address. We can pass TRUE
1732 as the 4th argument because we just saved the stack pointer
1733 and will restore it right after the call. */
1736 /* Set DRAP flag to true, even though allocate_dynamic_stack_space
1737 may have already set current_function_calls_alloca to true.
1738 current_function_calls_alloca won't be set if argsize is zero,
1739 so we have to guarantee need_drap is true here. */
1745 {
1748 else
1750 }
1757 /* Refer to the argument block. */
1762 /* Walk past the arg-pointer and structure value address. */
1767 /* Restore each of the registers previously saved. Make USE insns
1768 for each of these registers for use in making the call. */
1771 {
1779 }
1781 /* Restore the structure value address unless this is passed as an
1782 "invisible" first argument. */
1785 {
1791 }
1793 /* All arguments and registers used for the call are set up by now! */
1796 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
1797 and we don't want to load it into a register as an optimization,
1798 because prepare_call_address already did it if it should be done. */
1802 /* Generate the actual call instruction and save the return value. */
1804 {
1808 }
1810 {
1813 /* Locate the unique return register. It is not possible to
1814 express a call that sets more than one return register using
1815 call_value; use untyped_call for that. In fact, untyped_call
1816 only needs to save the return registers in the given block. */
1819 {
1823 }
1830 }
1831 else
1834 /* Find the CALL insn we just emitted, and attach the register usage
1835 information. */
1839 /* Restore the stack. */
1842 else
1846 OK_DEFER_POP;
1848 /* Return the address of the result block. */
1851 }
1853 /* Perform an untyped return. */
1855 static void
1857 {
1859 fixed_size_mode mode;
1860 rtx reg;
1869 {
1874 }
1876 /* Restore the return value and note that each value is used. */
1880 {
1892 }
1894 /* Put the USE insns before the return. */
1897 /* Return whatever values was restored by jumping directly to the end
1898 of the function. */
1900 }
1902 /* Used by expand_builtin_classify_type and fold_builtin_classify_type. */
1904 static enum type_class
1906 {
1908 {
1927 }
1928 }
1930 /* Expand a call EXP to __builtin_classify_type. */
1932 static rtx
1934 {
1938 }
1940 /* This helper macro, meant to be used in mathfn_built_in below, determines
1941 which among a set of builtin math functions is appropriate for a given type
1942 mode. The `F' (float) and `L' (long double) are automatically generated
1943 from the 'double' case. If a function supports the _Float<N> and _Float<N>X
1944 types, there are additional types that are considered with 'F32', 'F64',
1945 'F128', etc. suffixes. */
1946 #define CASE_MATHFN(MATHFN) \
1947 CASE_CFN_##MATHFN: \
1948 fcode = BUILT_IN_##MATHFN; fcodef = BUILT_IN_##MATHFN##F ; \
1949 fcodel = BUILT_IN_##MATHFN##L ; break;
1950 /* Similar to the above, but also add support for the _Float<N> and _Float<N>X
1951 types. */
1952 #define CASE_MATHFN_FLOATN(MATHFN) \
1953 CASE_CFN_##MATHFN: \
1954 fcode = BUILT_IN_##MATHFN; fcodef = BUILT_IN_##MATHFN##F ; \
1955 fcodel = BUILT_IN_##MATHFN##L ; fcodef16 = BUILT_IN_##MATHFN##F16 ; \
1956 fcodef32 = BUILT_IN_##MATHFN##F32; fcodef64 = BUILT_IN_##MATHFN##F64 ; \
1957 fcodef128 = BUILT_IN_##MATHFN##F128 ; fcodef32x = BUILT_IN_##MATHFN##F32X ; \
1958 fcodef64x = BUILT_IN_##MATHFN##F64X ; fcodef128x = BUILT_IN_##MATHFN##F128X ;\
1959 break;
1960 /* Similar to above, but appends _R after any F/L suffix. */
1961 #define CASE_MATHFN_REENT(MATHFN) \
1962 case CFN_BUILT_IN_##MATHFN##_R: \
1963 case CFN_BUILT_IN_##MATHFN##F_R: \
1964 case CFN_BUILT_IN_##MATHFN##L_R: \
1965 fcode = BUILT_IN_##MATHFN##_R; fcodef = BUILT_IN_##MATHFN##F_R ; \
1966 fcodel = BUILT_IN_##MATHFN##L_R ; break;
1968 /* Return a function equivalent to FN but operating on floating-point
1969 values of type TYPE, or END_BUILTINS if no such function exists.
1970 This is purely an operation on function codes; it does not guarantee
1971 that the target actually has an implementation of the function. */
1973 static built_in_function
1975 {
1976 tree mtype;
1987 {
2078 }
2101 else
2103 }
2105 /* Return mathematic function equivalent to FN but operating directly on TYPE,
2106 if available. If IMPLICIT_P is true use the implicit builtin declaration,
2107 otherwise use the explicit declaration. If we can't do the conversion,
2108 return null. */
2110 static tree
2112 {
2121 }
2123 /* Like mathfn_built_in_1, but always use the implicit array. */
2125 tree
2127 {
2129 }
2131 /* Like mathfn_built_in_1, but take a built_in_function and
2132 always use the implicit array. */
2134 tree
2136 {
2138 }
2140 /* If BUILT_IN_NORMAL function FNDECL has an associated internal function,
2141 return its code, otherwise return IFN_LAST. Note that this function
2142 only tests whether the function is defined in internals.def, not whether
2143 it is actually available on the target. */
2145 internal_fn
2147 {
2151 {
2152 #define DEF_INTERNAL_FLT_FN(NAME, FLAGS, OPTAB, TYPE) \
2153 CASE_FLT_FN (BUILT_IN_##NAME): return IFN_##NAME;
2154 #define DEF_INTERNAL_FLT_FLOATN_FN(NAME, FLAGS, OPTAB, TYPE) \
2155 CASE_FLT_FN (BUILT_IN_##NAME): return IFN_##NAME; \
2156 CASE_FLT_FN_FLOATN_NX (BUILT_IN_##NAME): return IFN_##NAME;
2157 #define DEF_INTERNAL_INT_FN(NAME, FLAGS, OPTAB, TYPE) \
2158 CASE_INT_FN (BUILT_IN_##NAME): return IFN_##NAME;
2175 }
2176 }
2178 /* If CALL is a call to a BUILT_IN_NORMAL function that could be replaced
2179 on the current target by a call to an internal function, return the
2180 code of that internal function, otherwise return IFN_LAST. The caller
2181 is responsible for ensuring that any side-effects of the built-in
2182 call are dealt with correctly. E.g. if CALL sets errno, the caller
2183 must decide that the errno result isn't needed or make it available
2184 in some other way. */
2186 internal_fn
2188 {
2190 {
2193 {
2198 }
2199 }
2201 }
2203 /* Expand a call to the builtin trinary math functions (fma).
2204 Return NULL_RTX if a normal call should be emitted rather than expanding the
2205 function in-line. EXP is the expression that is a call to the builtin
2206 function; if convenient, the result should be placed in TARGET.
2207 SUBTARGET may be used as the target for computing one of EXP's
2208 operands. */
2210 static rtx
2212 {
2213 optab builtin_optab;
2218 machine_mode mode;
2228 {
2234 }
2236 /* Make a suitable register to place result in. */
2239 /* Before working hard, check whether the instruction is available. */
2245 /* Always stabilize the argument list. */
2256 /* Compute into RESULT.
2257 Set RESULT to wherever the result comes back. */
2261 /* If we were unable to expand via the builtin, stop the sequence
2262 (without outputting the insns) and call to the library function
2263 with the stabilized argument list. */
2265 {
2268 }
2270 /* Output the entire sequence. */
2276 }
2278 /* Expand a call to the builtin sin and cos math functions.
2279 Return NULL_RTX if a normal call should be emitted rather than expanding the
2280 function in-line. EXP is the expression that is a call to the builtin
2281 function; if convenient, the result should be placed in TARGET.
2282 SUBTARGET may be used as the target for computing one of EXP's
2283 operands. */
2285 static rtx
2287 {
2288 optab builtin_optab;
2289 rtx op0;
2292 machine_mode mode;
2293 tree arg;
2301 {
2307 }
2309 /* Make a suitable register to place result in. */
2312 /* Check if sincos insn is available, otherwise fallback
2313 to sin or cos insn. */
2316 {
2323 }
2325 /* Before working hard, check whether the instruction is available. */
2327 {
2330 /* Wrap the computation of the argument in a SAVE_EXPR, as we may
2331 need to expand the argument again. This way, we will not perform
2332 side-effects more the once. */
2339 /* Compute into RESULT.
2340 Set RESULT to wherever the result comes back. */
2342 {
2346 {
2355 }
2357 }
2358 else
2362 {
2363 /* Output the entire sequence. */
2368 }
2370 /* If we were unable to expand via the builtin, stop the sequence
2371 (without outputting the insns) and call to the library function
2372 with the stabilized argument list. */
2374 }
2377 }
2379 /* Given an interclass math builtin decl FNDECL and it's argument ARG
2380 return an RTL instruction code that implements the functionality.
2381 If that isn't possible or available return CODE_FOR_nothing. */
2383 static enum insn_code
2385 {
2388 machine_mode mode;
2391 {
2405 /* These builtins have no optabs (yet). */
2409 }
2411 /* There's no easy way to detect the case we need to set EDOM. */
2415 /* Optab mode depends on the mode of the input argument. */
2421 }
2423 /* Expand a call to one of the builtin math functions that operate on
2424 floating point argument and output an integer result (ilogb, isinf,
2425 isnan, etc).
2426 Return 0 if a normal call should be emitted rather than expanding the
2427 function in-line. EXP is the expression that is a call to the builtin
2428 function; if convenient, the result should be placed in TARGET. */
2430 static rtx
2432 {
2434 rtx op0;
2436 machine_mode mode;
2437 tree arg;
2447 {
2452 /* Wrap the computation of the argument in a SAVE_EXPR, as we may
2453 need to expand the argument again. This way, we will not perform
2454 side-effects more the once. */
2469 }
2472 }
2474 /* Expand a call to the builtin sincos math function.
2475 Return NULL_RTX if a normal call should be emitted rather than expanding the
2476 function in-line. EXP is the expression that is a call to the builtin
2477 function. */
2479 static rtx
2481 {
2483 machine_mode mode;
2497 /* Make a suitable register to place result in. */
2500 /* Check if sincos insn is available, otherwise emit the call. */
2515 /* Compute into target1 and target2.
2516 Set TARGET to wherever the result comes back. */
2520 /* Move target1 and target2 to the memory locations indicated
2521 by op1 and op2. */
2526 }
2528 /* Expand a call to the internal cexpi builtin to the sincos math function.
2529 EXP is the expression that is a call to the builtin function; if convenient,
2530 the result should be placed in TARGET. */
2532 static rtx
2534 {
2537 machine_mode mode;
2548 /* Try expanding via a sincos optab, fall back to emitting a libcall
2549 to sincos or cexp. We are sure we have sincos or cexp because cexpi
2550 is only generated from sincos, cexp or if we have either of them. */
2552 {
2558 /* Compute into op1 and op2. */
2560 }
2562 {
2573 else
2583 /* Make sure not to fold the sincos call again. */
2587 }
2588 else
2589 {
2599 else
2602 /* If we don't have a decl for cexp create one. This is the
2603 friendliest fallback if the user calls __builtin_cexpi
2604 without full target C99 function support. */
2606 {
2607 tree fntype;
2619 }
2624 /* Make sure not to fold the cexp call again. */
2628 }
2630 /* Now build the proper return type. */
2635 }
2637 /* Conveniently construct a function call expression. FNDECL names the
2638 function to be called, N is the number of arguments, and the "..."
2639 parameters are the argument expressions. Unlike build_call_exr
2640 this doesn't fold the call, hence it will always return a CALL_EXPR. */
2642 static tree
2644 {
2654 }
2656 /* Expand a call to one of the builtin rounding functions gcc defines
2657 as an extension (lfloor and lceil). As these are gcc extensions we
2658 do not need to worry about setting errno to EDOM.
2659 If expanding via optab fails, lower expression to (int)(floor(x)).
2660 EXP is the expression that is a call to the builtin function;
2661 if convenient, the result should be placed in TARGET. */
2663 static rtx
2665 {
2666 convert_optab builtin_optab;
2671 tree fallback_fndecl;
2672 machine_mode mode;
2673 tree arg;
2681 {
2698 }
2700 /* Make a suitable register to place result in. */
2705 /* Wrap the computation of the argument in a SAVE_EXPR, as we may
2706 need to expand the argument again. This way, we will not perform
2707 side-effects more the once. */
2714 /* Compute into TARGET. */
2716 {
2717 /* Output the entire sequence. */
2722 }
2724 /* If we were unable to expand via the builtin, stop the sequence
2725 (without outputting the insns). */
2728 /* Fall back to floating point rounding optab. */
2731 /* For non-C99 targets we may end up without a fallback fndecl here
2732 if the user called __builtin_lfloor directly. In this case emit
2733 a call to the floor/ceil variants nevertheless. This should result
2734 in the best user experience for not full C99 targets. */
2736 {
2737 tree fntype;
2741 {
2774 }
2779 }
2786 /* Truncate the result of floating point optab to integer
2787 via expand_fix (). */
2792 }
2794 /* Expand a call to one of the builtin math functions doing integer
2795 conversion (lrint).
2796 Return 0 if a normal call should be emitted rather than expanding the
2797 function in-line. EXP is the expression that is a call to the builtin
2798 function; if convenient, the result should be placed in TARGET. */
2800 static rtx
2802 {
2803 convert_optab builtin_optab;
2804 rtx op0;
2807 tree arg;
2808 machine_mode mode;
2817 {
2836 }
2838 /* There's no easy way to detect the case we need to set EDOM. */
2842 /* Make a suitable register to place result in. */
2845 /* There's no easy way to detect the case we need to set EDOM. */
2847 {
2850 /* Wrap the computation of the argument in a SAVE_EXPR, as we may
2851 need to expand the argument again. This way, we will not perform
2852 side-effects more the once. */
2860 {
2861 /* Output the entire sequence. */
2866 }
2868 /* If we were unable to expand via the builtin, stop the sequence
2869 (without outputting the insns) and call to the library function
2870 with the stabilized argument list. */
2872 }
2875 {
2876 /* Fall back to rounding to long int. Use implicit_p 0 - for non-C99
2877 targets, (int) round (x) should never be transformed into
2878 BUILT_IN_IROUND and if __builtin_iround is called directly, emit
2879 a call to lround in the hope that the target provides at least some
2880 C99 functions. This should result in the best user experience for
2881 not full C99 targets. */
2882 tree fallback_fndecl = mathfn_built_in_1
2891 }
2894 }
2896 /* Expand a call to the powi built-in mathematical function. Return NULL_RTX if
2897 a normal call should be emitted rather than expanding the function
2898 in-line. EXP is the expression that is a call to the builtin
2899 function; if convenient, the result should be placed in TARGET. */
2901 static rtx
2903 {
2906 machine_mode mode;
2907 machine_mode mode2;
2916 /* Emit a libcall to libgcc. */
2918 /* Mode of the 2nd argument must match that of an int. */
2936 }
2938 /* Expand expression EXP which is a call to the strlen builtin. Return
2939 NULL_RTX if we failed and the caller should emit a normal call, otherwise
2940 try to get the result in TARGET, if convenient. */
2942 static rtx
2944 machine_mode target_mode)
2945 {
2950 rtx pat;
2951 tree len;
2953 rtx src_reg;
2955 machine_mode insn_mode;
2959 /* If the length can be computed at compile-time, return it. */
2964 /* If the length can be computed at compile-time and is constant
2965 integer, but there are side-effects in src, evaluate
2966 src for side-effects, then return len.
2967 E.g. x = strlen (i++ ? "xfoo" + 1 : "bar");
2968 can be optimized into: i++; x = 3; */
2971 {
2974 }
2978 /* If SRC is not a pointer type, don't do this operation inline. */
2982 /* Bail out if we can't compute strlen in the right mode. */
2984 {
2988 }
2992 /* Make a place to hold the source address. We will not expand
2993 the actual source until we are sure that the expansion will
2994 not fail -- there are trees that cannot be expanded twice. */
2997 /* Mark the beginning of the strlen sequence so we can emit the
2998 source operand later. */
3008 /* Check to see if the argument was declared attribute nonstring
3009 and if so, issue a warning since at this point it's not known
3010 to be nul-terminated. */
3013 /* Now that we are assured of success, expand the source. */
3017 {
3018 #ifdef POINTERS_EXTEND_UNSIGNED
3021 POINTERS_EXTEND_UNSIGNED);
3022 #endif
3024 }
3030 else
3033 /* Return the value in the proper mode for this function. */
3038 else
3042 }
3044 /* Expand call EXP to the strnlen built-in, returning the result
3045 and setting it in TARGET. Otherwise return NULL_RTX on failure. */
3047 static rtx
3049 {
3066 /* FIXME: Change c_strlen() to return sizetype instead of ssizetype
3067 so these conversions aren't necessary. */
3068 c_strlen_data lendata = { };
3074 {
3078 "%K%qD specified bound %E "
3085 {
3086 /* Clear EXACT if LEN may be less than SRC suggests,
3087 such as in
3088 strnlen (&a[i], sizeof a)
3089 where the value of i is unknown. Unless i's value is
3090 zero, the call is unsafe because the bound is greater. */
3094 }
3100 {
3101 location_t warnloc
3105 exact
3111 {
3116 }
3117 }
3124 }
3137 "%K%qD specified bound [%wu, %wu] "
3144 {
3148 }
3154 {
3155 location_t warnloc
3159 exact
3165 {
3169 }
3170 }
3180 }
3182 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
3183 bytes from constant string DATA + OFFSET and return it as target
3184 constant. */
3186 static rtx
3188 scalar_int_mode mode)
3189 {
3197 }
3199 /* LEN specify length of the block of memcpy/memset operation.
3200 Figure out its range and put it into MIN_SIZE/MAX_SIZE.
3201 In some cases we can make very likely guess on max size, then we
3202 set it into PROBABLE_MAX_SIZE. */
3204 static void
3209 {
3211 {
3214 }
3215 else
3216 {
3220 /* Determine bounds from the type. */
3223 else
3228 else
3234 {
3239 }
3241 {
3242 /* Anti range 0...N lets us to determine minimal size to N+1. */
3244 {
3247 }
3248 /* Code like
3250 int n;
3251 if (n < 100)
3252 memcpy (a, b, n)
3254 Produce anti range allowing negative values of N. We still
3255 can use the information and make a guess that N is not negative.
3256 */
3259 }
3260 }
3264 }
3266 /* Try to verify that the sizes and lengths of the arguments to a string
3267 manipulation function given by EXP are within valid bounds and that
3268 the operation does not lead to buffer overflow or read past the end.
3269 Arguments other than EXP may be null. When non-null, the arguments
3270 have the following meaning:
3271 DST is the destination of a copy call or NULL otherwise.
3272 SRC is the source of a copy call or NULL otherwise.
3273 DSTWRITE is the number of bytes written into the destination obtained
3274 from the user-supplied size argument to the function (such as in
3275 memcpy(DST, SRCs, DSTWRITE) or strncpy(DST, DRC, DSTWRITE).
3276 MAXREAD is the user-supplied bound on the length of the source sequence
3277 (such as in strncat(d, s, N). It specifies the upper limit on the number
3278 of bytes to write. If NULL, it's taken to be the same as DSTWRITE.
3279 SRCSTR is the source string (such as in strcpy(DST, SRC)) when the
3280 expression EXP is a string function call (as opposed to a memory call
3281 like memcpy). As an exception, SRCSTR can also be an integer denoting
3282 the precomputed size of the source string or object (for functions like
3283 memcpy).
3284 DSTSIZE is the size of the destination object specified by the last
3285 argument to the _chk builtins, typically resulting from the expansion
3286 of __builtin_object_size (such as in __builtin___strcpy_chk(DST, SRC,
3287 DSTSIZE).
3289 When DSTWRITE is null LEN is checked to verify that it doesn't exceed
3290 SIZE_MAX.
3292 If the call is successfully verified as safe return true, otherwise
3293 return false. */
3295 static bool
3298 {
3301 /* The size of the largest object is half the address space, or
3302 PTRDIFF_MAX. (This is way too permissive.) */
3305 /* Either the length of the source string for string functions or
3306 the size of the source object for raw memory functions. */
3311 /* Set to true when the exact number of bytes written by a string
3312 function like strcpy is not known and the only thing that is
3313 known is that it must be at least one (for the terminating nul). */
3316 {
3317 /* SRCSTR is normally a pointer to string but as a special case
3318 it can be an integer denoting the length of a string. */
3320 {
3321 /* Try to determine the range of lengths the source string
3322 refers to. If it can be determined and is less than
3323 the upper bound given by MAXREAD add one to it for
3324 the terminating nul. Otherwise, set it to one for
3325 the same reason, or to MAXREAD as appropriate. */
3326 c_strlen_data lendata = { };
3331 {
3334 else
3345 }
3346 else
3347 {
3350 }
3351 }
3352 else
3354 }
3357 {
3358 /* When the only available piece of data is the object size
3359 there is nothing to do. */
3363 /* Otherwise, when the length of the source sequence is known
3364 (as with strlen), set DSTWRITE to it. */
3367 }
3377 /* First check the number of bytes to be written against the maximum
3378 object size. */
3382 {
3392 "%K%qD specified size %E "
3395 else
3397 "%K%qD specified size between %E and %E "
3405 }
3407 /* The number of bytes to write is "exact" if DSTWRITE is non-null,
3408 constant, and in range of unsigned HOST_WIDE_INT. */
3411 /* Next check the number of bytes to be written against the destination
3412 object size. */
3414 {
3419 || (dstwrite
3422 {
3430 {
3431 /* This is a call to strcpy with a destination of 0 size
3432 and a source of unknown length. The call will write
3433 at least one byte past the end of the destination. */
3435 "%K%qD writing %E or more bytes into a region "
3438 }
3441 "%K%qD writing %E byte into a region "
3443 "%K%qD writing %E bytes into a region "
3447 {
3448 /* Avoid printing the upper bound if it's invalid. */
3450 "%K%qD writing %E or more bytes into a region "
3453 }
3454 else
3456 "%K%qD writing between %E and %E bytes into "
3459 dstsize);
3461 /* Return error when an overflow has been detected. */
3463 }
3464 }
3466 /* Check the maximum length of the source sequence against the size
3467 of the destination object if known, or against the maximum size
3468 of an object. */
3470 {
3473 /* Use the lower end for MAXREAD from now on. */
3478 {
3483 {
3487 /* Warn about crazy big sizes first since that's more
3488 likely to be meaningful than saying that the bound
3489 is greater than the object size if both are big. */
3492 "%K%qD specified bound %E "
3496 else
3498 "%K%qD specified bound between %E and %E "
3504 }
3507 {
3513 "%K%qD specified bound %E "
3517 else
3519 "%K%qD specified bound between %E and %E "
3524 }
3525 }
3526 }
3528 /* Check for reading past the end of SRC. */
3533 {
3545 {
3546 /* Avoid printing the upper bound if it's invalid. */
3548 "%K%qD reading %E or more bytes from a region "
3551 }
3552 else
3554 "%K%qD reading between %E and %E bytes from a region "
3558 }
3561 }
3563 /* Helper to compute the size of the object referenced by the DEST
3564 expression which must have pointer type, using Object Size type
3565 OSTYPE (only the least significant 2 bits are used). Return
3566 an estimate of the size of the object if successful or NULL when
3567 the size cannot be determined. When the referenced object involves
3568 a non-constant offset in some range the returned value represents
3569 the largest size given the smallest non-negative offset in the
3570 range. The function is intended for diagnostics and should not
3571 be used to influence code generation or optimization. */
3573 tree
3575 {
3578 /* Only the two least significant bits are meaningful. */
3585 {
3594 {
3595 /* compute_builtin_object_size fails for addresses with
3596 non-constant offsets. Try to determine the range of
3597 such an offset here and use it to adjust the constant
3598 size. */
3601 {
3603 {
3607 /* Ignore negative offsets for now. For others,
3608 use the lower bound as the most optimistic
3609 estimate of the (remaining) size. */
3611 ;
3615 else
3617 }
3618 }
3621 {
3626 {
3628 {
3631 /* Ignore negative offsets for now. For others,
3632 use the lower bound as the most optimistic
3633 estimate of the (remaining)size. */
3636 ;
3640 else
3642 }
3643 }
3644 }
3645 }
3648 }
3650 /* Unless computing the largest size (for memcpy and other raw memory
3651 functions), try to determine the size of the object from its type. */
3666 {
3667 /* Return the constant size unless it's zero (that's a zero-length
3668 array likely at the end of a struct). */
3673 }
3676 }
3678 /* Helper to determine and check the sizes of the source and the destination
3679 of calls to __builtin_{bzero,memcpy,mempcpy,memset} calls. EXP is the
3680 call expression, DEST is the destination argument, SRC is the source
3681 argument or null, and LEN is the number of bytes. Use Object Size type-0
3682 regardless of the OPT_Wstringop_overflow_ setting. Return true on success
3683 (no overflow or invalid sizes), false otherwise. */
3685 static bool
3687 {
3688 /* For functions like memset and memcpy that operate on raw memory
3689 try to determine the size of the largest source and destination
3690 object using type-0 Object Size regardless of the object size
3691 type specified by the option. */
3697 }
3699 /* Validate memchr arguments without performing any expansion.
3700 Return NULL_RTX. */
3702 static rtx
3704 {
3712 /* Diagnose calls where the specified length exceeds the size
3713 of the object. */
3715 {
3719 }
3722 }
3724 /* Expand a call EXP to the memcpy builtin.
3725 Return NULL_RTX if we failed, the caller should emit a normal call,
3726 otherwise try to get the result in TARGET, if convenient (and in
3727 mode MODE if that's convenient). */
3729 static rtx
3731 {
3744 }
3746 /* Check a call EXP to the memmove built-in for validity.
3747 Return NULL_RTX on both success and failure. */
3749 static rtx
3751 {
3763 }
3765 /* Expand a call EXP to the mempcpy builtin.
3766 Return NULL_RTX if we failed; the caller should emit a normal call,
3767 otherwise try to get the result in TARGET, if convenient (and in
3768 mode MODE if that's convenient). */
3770 static rtx
3772 {
3781 /* Policy does not generally allow using compute_objsize (which
3782 is used internally by check_memop_size) to change code generation
3783 or drive optimization decisions.
3785 In this instance it is safe because the code we generate has
3786 the same semantics regardless of the return value of
3787 check_memop_sizes. Exactly the same amount of data is copied
3788 and the return value is exactly the same in both cases.
3790 Furthermore, check_memop_size always uses mode 0 for the call to
3791 compute_objsize, so the imprecise nature of compute_objsize is
3792 avoided. */
3794 /* Avoid expanding mempcpy into memcpy when the call is determined
3795 to overflow the buffer. This also prevents the same overflow
3796 from being diagnosed again when expanding memcpy. */
3802 }
3804 /* Helper function to do the actual work for expand of memory copy family
3805 functions (memcpy, mempcpy, stpcpy). Expansing should assign LEN bytes
3806 of memory from SRC to DEST and assign to TARGET if convenient. Return
3807 value is based on RETMODE argument. */
3809 static rtx
3812 {
3825 /* If DEST is not a pointer type, call the normal function. */
3829 /* If either SRC is not a pointer type, don't do this
3830 operation in-line. */
3847 /* If SRC is a string constant and block move would be done
3848 by pieces, we can avoid loading the string from memory
3849 and only stored the computed constants. */
3856 {
3858 builtin_memcpy_read_str,
3864 }
3869 /* Copy word part most expediently. */
3884 /* Bail out when a mempcpy call would be expanded as libcall and when
3885 we have a target that provides a fast implementation
3886 of mempcpy routine. */
3894 {
3897 }
3900 {
3902 /* stpcpy pointer to last byte. */
3905 }
3908 }
3910 static rtx
3913 {
3915 retmode);
3916 }
3918 /* Expand into a movstr instruction, if one is available. Return NULL_RTX if
3919 we failed, the caller should emit a normal call, otherwise try to
3920 get the result in TARGET, if convenient.
3921 Return value is based on RETMODE argument. */
3923 static rtx
3925 {
3927 rtx dest_mem;
3928 rtx src_mem;
3936 {
3939 }
3949 {
3951 /* movstr is supposed to set end to the address of the NUL
3952 terminator. If the caller requested a mempcpy-like return value,
3953 adjust it. */
3955 {
3959 }
3960 }
3962 }
3964 /* Do some very basic size validation of a call to the strcpy builtin
3965 given by EXP. Return NULL_RTX to have the built-in expand to a call
3966 to the library function. */
3968 static rtx
3970 {
3978 /* There is no way here to determine the length of the string in
3979 the destination to which the SRC string is being appended so
3980 just diagnose cases when the souce string is longer than
3981 the destination object. */
3986 destsize);
3989 }
3991 /* Expand expression EXP, which is a call to the strcpy builtin. Return
3992 NULL_RTX if we failed the caller should emit a normal call, otherwise
3993 try to get the result in TARGET, if convenient (and in mode MODE if that's
3994 convenient). */
3996 static rtx
3998 {
4006 {
4010 }
4013 {
4014 /* Check to see if the argument was declared attribute nonstring
4015 and if so, issue a warning since at this point it's not known
4016 to be nul-terminated. */
4020 }
4023 }
4025 /* Helper function to do the actual work for expand_builtin_strcpy. The
4026 arguments to the builtin_strcpy call DEST and SRC are broken out
4027 so that this can also be called without constructing an actual CALL_EXPR.
4028 The other arguments and return value are the same as for
4029 expand_builtin_strcpy. */
4031 static rtx
4033 {
4034 /* Detect strcpy calls with unterminated arrays.. */
4036 {
4037 /* NONSTR refers to the non-nul terminated constant array. */
4041 }
4044 }
4046 /* Expand a call EXP to the stpcpy builtin.
4047 Return NULL_RTX if we failed the caller should emit a normal call,
4048 otherwise try to get the result in TARGET, if convenient (and in
4049 mode MODE if that's convenient). */
4051 static rtx
4053 {
4064 {
4068 }
4070 /* If return value is ignored, transform stpcpy into strcpy. */
4072 {
4076 }
4077 else
4078 {
4080 rtx ret;
4082 /* Ensure we get an actual string whose length can be evaluated at
4083 compile-time, not an expression containing a string. This is
4084 because the latter will potentially produce pessimized code
4085 when used to produce the return value. */
4086 c_strlen_data lendata = { };
4104 {
4108 {
4112 {
4114 {
4117 else
4119 }
4128 }
4129 }
4130 }
4134 }
4135 }
4137 /* Expand a call EXP to the stpcpy builtin and diagnose uses of nonstring
4138 arguments while being careful to avoid duplicate warnings (which could
4139 be issued if the expander were to expand the call, resulting in it
4140 being emitted in expand_call(). */
4142 static rtx
4144 {
4146 {
4147 /* The call has been successfully expanded. Check for nonstring
4148 arguments and issue warnings as appropriate. */
4151 }
4154 }
4156 /* Check a call EXP to the stpncpy built-in for validity.
4157 Return NULL_RTX on both success and failure. */
4159 static rtx
4161 {
4167 /* The source and destination of the call. */
4171 /* The exact number of bytes to write (not the maximum). */
4174 /* The size of the destination object. */
4180 }
4182 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
4183 bytes from constant string DATA + OFFSET and return it as target
4184 constant. */
4186 rtx
4188 scalar_int_mode mode)
4189 {
4196 }
4198 /* Helper to check the sizes of sequences and the destination of calls
4199 to __builtin_strncat and __builtin___strncat_chk. Returns true on
4200 success (no overflow or invalid sizes), false otherwise. */
4202 static bool
4204 {
4209 /* Try to determine the range of lengths that the source expression
4210 refers to. */
4211 c_strlen_data lendata = { };
4214 /* Try to verify that the destination is big enough for the shortest
4215 string. */
4218 {
4219 /* If it hasn't been provided by __strncat_chk, try to determine
4220 the size of the destination object into which the source is
4221 being copied. */
4223 }
4225 /* Add one for the terminating nul. */
4228 size_one_node)
4231 /* The strncat function copies at most MAXREAD bytes and always appends
4232 the terminating nul so the specified upper bound should never be equal
4233 to (or greater than) the size of the destination. */
4236 {
4245 }
4253 /* The number of bytes to write is LEN but check_access will also
4254 check SRCLEN if LEN's value isn't known. */
4256 objsize);
4257 }
4259 /* Similar to expand_builtin_strcat, do some very basic size validation
4260 of a call to the strcpy builtin given by EXP. Return NULL_RTX to have
4261 the built-in expand to a call to the library function. */
4263 static rtx
4265 {
4273 /* The upper bound on the number of bytes to write. */
4275 /* The length of the source sequence. */
4278 /* Try to determine the range of lengths that the source expression
4279 refers to. Since the lengths are only used for warning and not
4280 for code generation disable strict mode below. */
4283 {
4284 c_strlen_data lendata = { };
4287 }
4289 /* Try to verify that the destination is big enough for the shortest
4290 string. First try to determine the size of the destination object
4291 into which the source is being copied. */
4294 /* Add one for the terminating nul. */
4295 tree srclen = (maxlen
4297 size_one_node)
4300 /* The strncat function copies at most MAXREAD bytes and always appends
4301 the terminating nul so the specified upper bound should never be equal
4302 to (or greater than) the size of the destination. */
4305 {
4314 }
4322 /* The number of bytes to write is SRCLEN. */
4326 }
4328 /* Expand expression EXP, which is a call to the strncpy builtin. Return
4329 NULL_RTX if we failed the caller should emit a normal call. */
4331 static rtx
4333 {
4338 {
4341 /* The number of bytes to write (not the maximum). */
4343 /* The length of the source sequence. */
4347 {
4351 /* The number of bytes to write is LEN but check_access will also
4352 check SLEN if LEN's value isn't known. */
4354 destsize);
4355 }
4357 /* We must be passed a constant len and src parameter. */
4363 /* We're required to pad with trailing zeros if the requested
4364 len is greater than strlen(s2)+1. In that case try to
4365 use store_by_pieces, if it fails, punt. */
4367 {
4370 rtx dest_mem;
4374 builtin_strncpy_read_str,
4381 builtin_strncpy_read_str,
4383 RETURN_BEGIN);
4387 }
4388 }
4390 }
4392 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
4393 bytes from constant string DATA + OFFSET and return it as target
4394 constant. */
4396 rtx
4398 scalar_int_mode mode)
4399 {
4406 }
4408 /* Callback routine for store_by_pieces. Return the RTL of a register
4409 containing GET_MODE_SIZE (MODE) consecutive copies of the unsigned
4410 char value given in the RTL register data. For example, if mode is
4411 4 bytes wide, return the RTL for 0x01010101*data. */
4413 static rtx
4415 scalar_int_mode mode)
4416 {
4432 }
4434 /* Expand expression EXP, which is a call to the memset builtin. Return
4435 NULL_RTX if we failed the caller should emit a normal call, otherwise
4436 try to get the result in TARGET, if convenient (and in mode MODE if that's
4437 convenient). */
4439 static rtx
4441 {
4453 }
4455 /* Helper function to do the actual work for expand_builtin_memset. The
4456 arguments to the builtin_memset call DEST, VAL, and LEN are broken out
4457 so that this can also be called without constructing an actual CALL_EXPR.
4458 The other arguments and return value are the same as for
4459 expand_builtin_memset. */
4461 static rtx
4464 {
4467 machine_mode val_mode;
4479 /* If DEST is not a pointer type, don't do this operation in-line. */
4490 /* If the LEN parameter is zero, return DEST. */
4492 {
4493 /* Evaluate and ignore VAL in case it has side-effects. */
4496 }
4498 /* Stabilize the arguments in case we fail. */
4510 {
4511 rtx val_rtx;
4516 /* Assume that we can memset by pieces if we can store
4517 * the coefficients by pieces (in the required modes).
4518 * We can't pass builtin_memset_gen_str as that emits RTL. */
4524 {
4529 }
4533 probable_max_size))
4539 }
4545 {
4552 RETURN_BEGIN);
4557 probable_max_size))
4563 }
4571 probable_max_size);
4574 {
4577 }
4581 do_libcall:
4590 else
4595 }
4597 /* Expand expression EXP, which is a call to the bzero builtin. Return
4598 NULL_RTX if we failed the caller should emit a normal call. */
4600 static rtx
4602 {
4611 /* New argument list transforming bzero(ptr x, int y) to
4612 memset(ptr x, int 0, size_t y). This is done this way
4613 so that if it isn't expanded inline, we fallback to
4614 calling bzero instead of memset. */
4622 }
4624 /* Try to expand cmpstr operation ICODE with the given operands.
4625 Return the result rtx on success, otherwise return null. */
4627 static rtx
4629 HOST_WIDE_INT align)
4630 {
4644 }
4646 /* Expand expression EXP, which is a call to the memcmp built-in function.
4647 Return NULL_RTX if we failed and the caller should emit a normal call,
4648 otherwise try to get the result in TARGET, if convenient.
4649 RESULT_EQ is true if we can relax the returned value to be either zero
4650 or nonzero, without caring about the sign. */
4652 static rtx
4654 {
4665 /* Diagnose calls where the specified length exceeds the size of either
4666 object. */
4672 {
4677 }
4679 /* If the specified length exceeds the size of either object,
4680 call the function. */
4684 /* Due to the performance benefit, always inline the calls first
4685 when result_eq is false. */
4689 {
4693 }
4701 /* If we don't have POINTER_TYPE, call the function. */
4709 /* Set MEM_SIZE as appropriate. */
4711 {
4714 }
4720 {
4724 }
4726 /* If SRC is a string constant and block move would be done
4727 by pieces, we can avoid loading the string from memory
4728 and only stored the computed constants. */
4740 {
4741 /* Return the value in the proper mode for this function. */
4746 {
4749 }
4752 }
4755 }
4757 /* Expand expression EXP, which is a call to the strcmp builtin. Return NULL_RTX
4758 if we failed the caller should emit a normal call, otherwise try to get
4759 the result in TARGET, if convenient. */
4761 static rtx
4763 {
4767 /* Due to the performance benefit, always inline the calls first. */
4784 /* If we don't have POINTER_TYPE, call the function. */
4788 /* Stabilize the arguments in case gen_cmpstr(n)si fail. */
4795 /* Try to call cmpstrsi. */
4800 /* Try to determine at least one length and call cmpstrnsi. */
4802 {
4803 tree len;
4804 rtx arg3_rtx;
4814 /* If we don't have a constant length for the first, use the length
4815 of the second, if we know it. We don't require a constant for
4816 this case; some cost analysis could be done if both are available
4817 but neither is constant. For now, assume they're equally cheap,
4818 unless one has side effects. If both strings have constant lengths,
4819 use the smaller. */
4835 else
4838 /* If both arguments have side effects, we cannot optimize. */
4840 {
4842 result = expand_cmpstrn_or_cmpmem
4845 }
4846 }
4850 {
4851 /* Check to see if the argument was declared attribute nonstring
4852 and if so, issue a warning since at this point it's not known
4853 to be nul-terminated. */
4856 /* Return the value in the proper mode for this function. */
4864 }
4866 /* Expand the library call ourselves using a stabilized argument
4867 list to avoid re-evaluating the function's arguments twice. */
4872 }
4874 /* Expand expression EXP, which is a call to the strncmp builtin. Return
4875 NULL_RTX if we failed the caller should emit a normal call, otherwise try to get
4876 the result in TARGET, if convenient. */
4878 static rtx
4880 ATTRIBUTE_UNUSED machine_mode mode)
4881 {
4886 /* Due to the performance benefit, always inline the calls first. */
4892 /* If c_strlen can determine an expression for one of the string
4893 lengths, and it doesn't have side effects, then emit cmpstrnsi
4894 using length MIN(strlen(string)+1, arg3). */
4899 tree len;
4920 /* If we don't have a constant length for the first, use the length
4921 of the second, if we know it. If neither string is constant length,
4922 use the given length argument. We don't require a constant for
4923 this case; some cost analysis could be done if both are available
4924 but neither is constant. For now, assume they're equally cheap,
4925 unless one has side effects. If both strings have constant lengths,
4926 use the smaller. */
4944 else
4947 /* If we are not using the given length, we must incorporate it here.
4948 The actual new length parameter will be MIN(len,arg3) in this case. */
4950 {
4953 }
4963 {
4964 /* Check to see if the argument was declared attribute nonstring
4965 and if so, issue a warning since at this point it's not known
4966 to be nul-terminated. */
4969 /* Return the value in the proper mode for this function. */
4977 }
4979 /* Expand the library call ourselves using a stabilized argument
4980 list to avoid re-evaluating the function's arguments twice. */
4985 }
4987 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
4988 if that's convenient. */
4990 rtx
4992 {
4993 rtx val;
4996 /* Don't do __builtin_saveregs more than once in a function.
4997 Save the result of the first call and reuse it. */
5001 /* When this function is called, it means that registers must be
5002 saved on entry to this function. So we migrate the call to the
5003 first insn of this function. */
5007 /* Do whatever the machine needs done in this case. */
5015 /* Put the insns after the NOTE that starts the function. If this
5016 is inside a start_sequence, make the outer-level insn chain current, so
5017 the code is placed at the start of the function. */
5023 }
5025 /* Expand a call to __builtin_next_arg. */
5027 static rtx
5029 {
5030 /* Checking arguments is already done in fold_builtin_next_arg
5031 that must be called before this function. */
5036 }
5038 /* Make it easier for the backends by protecting the valist argument
5039 from multiple evaluations. */
5041 static tree
5043 {
5046 /* The current way of determining the type of valist is completely
5047 bogus. We should have the information on the va builtin instead. */
5052 {
5056 /* For this case, the backends will be expecting a pointer to
5057 vatype, but it's possible we've actually been given an array
5058 (an actual TARGET_CANONICAL_VA_LIST_TYPE (valist)).
5059 So fix it. */
5061 {
5064 }
5065 }
5066 else
5067 {
5071 {
5077 }
5083 }
5086 }
5088 /* The "standard" definition of va_list is void*. */
5090 tree
5092 {
5094 }
5096 /* The "standard" abi va_list is va_list_type_node. */
5098 tree
5100 {
5102 }
5104 /* The "standard" type of va_list is va_list_type_node. */
5106 tree
5108 {
5115 {
5116 /* If va_list is an array type, the argument may have decayed
5117 to a pointer type, e.g. by being passed to another function.
5118 In that case, unwrap both types so that we can compare the
5119 underlying records. */
5122 {
5125 }
5126 }
5131 }
5133 /* The "standard" implementation of va_start: just assign `nextarg' to
5134 the variable. */
5136 void
5138 {
5141 }
5143 /* Expand EXP, a call to __builtin_va_start. */
5145 static rtx
5147 {
5148 rtx nextarg;
5149 tree valist;
5153 {
5156 }
5166 else
5170 }
5172 /* Expand EXP, a call to __builtin_va_end. */
5174 static rtx
5176 {
5179 /* Evaluate for side effects, if needed. I hate macros that don't
5180 do that. */
5185 }
5187 /* Expand EXP, a call to __builtin_va_copy. We do this as a
5188 builtin rather than just as an assignment in stdarg.h because of the
5189 nastiness of array-type va_list types. */
5191 static rtx
5193 {
5206 {
5210 }
5211 else
5212 {
5215 /* Evaluate to pointers. */
5224 /* "Dereference" to BLKmode memories. */
5232 /* Copy. */
5234 }
5237 }
5239 /* Expand a call to one of the builtin functions __builtin_frame_address or
5240 __builtin_return_address. */
5242 static rtx
5244 {
5245 /* The argument must be a nonnegative integer constant.
5246 It counts the number of frames to scan up the stack.
5247 The value is either the frame pointer value or the return
5248 address saved in that frame. */
5250 /* Warning about missing arg was already issued. */
5253 {
5256 }
5257 else
5258 {
5259 /* Number of frames to scan up the stack. */
5264 /* Some ports cannot access arbitrary stack frames. */
5266 {
5269 }
5272 {
5273 /* Warn since no effort is made to ensure that any frame
5274 beyond the current one exists or can be safely reached. */
5277 }
5279 /* For __builtin_frame_address, return what we've got. */
5287 }
5288 }
5290 /* Expand EXP, a call to the alloca builtin. Return NULL_RTX if we
5291 failed and the caller should emit a normal call. */
5293 static rtx
5295 {
5296 rtx op0;
5297 rtx result;
5300 HOST_WIDE_INT max_size;
5303 bool valid_arglist
5306 VOID_TYPE)
5317 || (!alloca_for_var
5320 ))
5321 {
5322 /* -Walloca-larger-than and -Wvla-larger-than settings of
5323 less than HOST_WIDE_INT_MAX override the more general
5324 -Walloc-size-larger-than so unless either of the former
5325 options is smaller than the last one (wchich would imply
5326 that the call was already checked), check the alloca
5327 arguments for overflow. */
5331 }
5333 /* Compute the argument. */
5336 /* Compute the alignment. */
5338 ? BIGGEST_ALIGNMENT
5341 /* Compute the maximum size. */
5346 /* Allocate the desired space. If the allocation stems from the declaration
5347 of a variable-sized object, it cannot accumulate. */
5348 result
5353 }
5355 /* Emit a call to __asan_allocas_unpoison call in EXP. Add to second argument
5356 of the call virtual_stack_dynamic_rtx - stack_pointer_rtx, which is the
5357 STACK_DYNAMIC_OFFSET value. See motivation for this in comment to
5358 handle_builtin_stack_restore function. */
5360 static rtx
5362 {
5369 OPTAB_LIB_WIDEN);
5372 OPTAB_LIB_WIDEN);
5377 }
5379 /* Expand a call to bswap builtin in EXP.
5380 Return NULL_RTX if a normal call should be emitted rather than expanding the
5381 function in-line. If convenient, the result should be placed in TARGET.
5382 SUBTARGET may be used as the target for computing one of EXP's operands. */
5384 static rtx
5386 rtx subtarget)
5387 {
5388 tree arg;
5389 rtx op0;
5407 }
5409 /* Expand a call to a unary builtin in EXP.
5410 Return NULL_RTX if a normal call should be emitted rather than expanding the
5411 function in-line. If convenient, the result should be placed in TARGET.
5412 SUBTARGET may be used as the target for computing one of EXP's operands. */
5414 static rtx
5417 {
5418 rtx op0;
5423 /* Compute the argument. */
5425 (subtarget
5429 /* Compute op, into TARGET if possible.
5430 Set TARGET to wherever the result comes back. */
5436 }
5438 /* Expand a call to __builtin_expect. We just return our argument
5439 as the builtin_expect semantic should've been already executed by
5440 tree branch prediction pass. */
5442 static rtx
5444 {
5445 tree arg;
5452 /* When guessing was done, the hints should be already stripped away. */
5456 }
5458 /* Expand a call to __builtin_expect_with_probability. We just return our
5459 argument as the builtin_expect semantic should've been already executed by
5460 tree branch prediction pass. */
5462 static rtx
5464 {
5465 tree arg;
5472 /* When guessing was done, the hints should be already stripped away. */
5476 }
5479 /* Expand a call to __builtin_assume_aligned. We just return our first
5480 argument as the builtin_assume_aligned semantic should've been already
5481 executed by CCP. */
5483 static rtx
5485 {
5489 EXPAND_NORMAL);
5494 }
5496 void
5498 {
5500 {
5502 /* For trap insns when not accumulating outgoing args force
5503 REG_ARGS_SIZE note to prevent crossjumping of calls with
5504 different args sizes. */
5507 }
5508 else
5509 {
5513 }
5516 }
5518 /* Expand a call to __builtin_unreachable. We do nothing except emit
5519 a barrier saying that control flow will not pass here.
5521 It is the responsibility of the program being compiled to ensure
5522 that control flow does never reach __builtin_unreachable. */
5523 static void
5525 {
5527 }
5529 /* Expand EXP, a call to fabs, fabsf or fabsl.
5530 Return NULL_RTX if a normal call should be emitted rather than expanding
5531 the function inline. If convenient, the result should be placed
5532 in TARGET. SUBTARGET may be used as the target for computing
5533 the operand. */
5535 static rtx
5537 {
5538 machine_mode mode;
5539 tree arg;
5540 rtx op0;
5550 }
5552 /* Expand EXP, a call to copysign, copysignf, or copysignl.
5553 Return NULL is a normal call should be emitted rather than expanding the
5554 function inline. If convenient, the result should be placed in TARGET.
5555 SUBTARGET may be used as the target for computing the operand. */
5557 static rtx
5559 {
5561 tree arg;
5573 }
5575 /* Expand a call to __builtin___clear_cache. */
5577 static rtx
5579 {
5581 {
5582 #ifdef CLEAR_INSN_CACHE
5583 /* There is no "clear_cache" insn, and __clear_cache() in libgcc
5584 does something. Just do the default expansion to a call to
5585 __clear_cache(). */
5587 #else
5588 /* There is no "clear_cache" insn, and __clear_cache() in libgcc
5589 does nothing. There is no need to call it. Do nothing. */
5592 }
5594 /* We have a "clear_cache" insn, and it will handle everything. */
5598 /* We must not expand to a library call. If we did, any
5599 fallback library function in libgcc that might contain a call to
5600 __builtin___clear_cache() would recurse infinitely. */
5602 {
5605 }
5608 {
5621 }
5623 }
5625 /* Given a trampoline address, make sure it satisfies TRAMPOLINE_ALIGNMENT. */
5627 static rtx
5629 {
5632 /* If we don't need too much alignment, we'll have been guaranteed
5633 proper alignment by get_trampoline_type. */
5637 /* Round address up to desired boundary. */
5648 }
5650 static rtx
5652 {
5668 /* If ONSTACK, the TRAMP argument should be the address of a field
5669 within the local function's FRAME decl. Either way, let's see if
5670 we can fill in the MEM_ATTRs for this memory. */
5674 /* Creator of a heap trampoline is responsible for making sure the
5675 address is aligned to at least STACK_BOUNDARY. Normally malloc
5676 will ensure this anyhow. */
5679 {
5683 }
5685 /* The FUNC argument should be the address of the nested function.
5686 Extract the actual function decl to pass to the hook. */
5693 /* Generate insns to initialize the trampoline. */
5697 {
5703 }
5706 }
5708 static rtx
5710 {
5711 rtx tramp;
5722 }
5724 /* Expand a call to the builtin descriptor initialization routine.
5725 A descriptor is made up of a couple of pointers to the static
5726 chain and the code entry in this order. */
5728 static rtx
5730 {
5735 VOID_TYPE))
5749 /* Generate insns to initialize the descriptor. */
5755 }
5757 /* Expand a call to the builtin descriptor adjustment routine. */
5759 static rtx
5761 {
5762 rtx tramp;
5769 /* Unalign the descriptor to allow runtime identification. */
5774 }
5776 /* Expand the call EXP to the built-in signbit, signbitf or signbitl
5777 function. The function first checks whether the back end provides
5778 an insn to implement signbit for the respective mode. If not, it
5779 checks whether the floating point format of the value is such that
5780 the sign bit can be extracted. If that is not the case, error out.
5781 EXP is the expression that is a call to the builtin function; if
5782 convenient, the result should be placed in TARGET. */
5783 static rtx
5785 {
5787 scalar_float_mode fmode;
5789 tree arg;
5792 rtx temp;
5805 /* Expand the argument yielding a RTX expression. */
5808 /* Check if the back end provides an insn that handles signbit for the
5809 argument's mode. */
5812 {
5818 }
5820 /* For floating point formats without a sign bit, implement signbit
5821 as "ARG < 0.0". */
5824 {
5825 /* But we can't do this if the format supports signed zero. */
5831 }
5834 {
5837 }
5838 else
5839 {
5841 /* Handle targets with different FP word orders. */
5844 else
5848 }
5850 /* Force the intermediate word_mode (or narrower) result into a
5851 register. This avoids attempting to create paradoxical SUBREGs
5852 of floating point modes below. */
5855 /* If the bitpos is within the "result mode" lowpart, the operation
5856 can be implement with a single bitwise AND. Otherwise, we need
5857 a right shift and an AND. */
5860 {
5868 }
5869 else
5870 {
5871 /* Perform a logical right shift to place the signbit in the least
5872 significant bit, then truncate the result to the desired mode
5873 and mask just this bit. */
5878 }
5881 }
5883 /* Expand fork or exec calls. TARGET is the desired target of the
5884 call. EXP is the call. FN is the
5885 identificator of the actual function. IGNORE is nonzero if the
5886 value is to be ignored. */
5888 static rtx
5890 {
5892 tree call;
5894 /* If we are not profiling, just call the function. */
5898 /* Otherwise call the wrapper. This should be equivalent for the rest of
5899 compiler, so the code does not diverge, and the wrapper may run the
5900 code necessary for keeping the profiling sane. */
5903 {
5934 }
5946 }
5949 \f
5950 /* Reconstitute a mode for a __sync intrinsic operation. Since the type of
5951 the pointer in these functions is void*, the tree optimizers may remove
5952 casts. The mode computed in expand_builtin isn't reliable either, due
5953 to __sync_bool_compare_and_swap.
5955 FCODE_DIFF should be fcode - base, where base is the FOO_1 code for the
5956 group of builtins. This gives us log2 of the mode size. */
5960 {
5961 /* The size is not negotiable, so ask not to get BLKmode in return
5962 if the target indicates that a smaller size would be better. */
5964 }
5966 /* Expand the memory expression LOC and return the appropriate memory operand
5967 for the builtin_sync operations. */
5969 static rtx
5971 {
5981 /* Note that we explicitly do not want any alias information for this
5982 memory, so that we kill all other live memories. Otherwise we don't
5983 satisfy the full barrier semantics of the intrinsic. */
5990 /* The alignment needs to be at least according to that of the mode. */
5997 }
5999 /* Make sure an argument is in the right mode.
6000 EXP is the tree argument.
6001 MODE is the mode it should be in. */
6003 static rtx
6005 {
6006 rtx val;
6007 machine_mode old_mode;
6010 /* If VAL is promoted to a wider mode, convert it back to MODE. Take care
6011 of CONST_INTs, where we know the old_mode only from the call argument. */
6018 }
6021 /* Expand the __sync_xxx_and_fetch and __sync_fetch_and_xxx intrinsics.
6022 EXP is the CALL_EXPR. CODE is the rtx code
6023 that corresponds to the arithmetic or logical operation from the name;
6024 an exception here is that NOT actually means NAND. TARGET is an optional
6025 place for us to store the results; AFTER is true if this is the
6026 fetch_and_xxx form. */
6028 static rtx
6031 rtx target)
6032 {
6037 {
6044 {
6073 }
6074 }
6076 /* Expand the operands. */
6081 after);
6082 }
6084 /* Expand the __sync_val_compare_and_swap and __sync_bool_compare_and_swap
6085 intrinsics. EXP is the CALL_EXPR. IS_BOOL is
6086 true if this is the boolean form. TARGET is a place for us to store the
6087 results; this is NOT optional if IS_BOOL is true. */
6089 static rtx
6092 {
6096 /* Expand the operands. */
6103 {
6106 else
6108 }
6111 MEMMODEL_SYNC_SEQ_CST))
6115 }
6117 /* Expand the __sync_lock_test_and_set intrinsic. Note that the most
6118 general form is actually an atomic exchange, and some targets only
6119 support a reduced form with the second argument being a constant 1.
6120 EXP is the CALL_EXPR; TARGET is an optional place for us to store
6121 the results. */
6123 static rtx
6125 rtx target)
6126 {
6129 /* Expand the operands. */
6134 }
6136 /* Expand the __sync_lock_release intrinsic. EXP is the CALL_EXPR. */
6138 static void
6140 {
6141 rtx mem;
6143 /* Expand the operands. */
6147 }
6149 /* Given an integer representing an ``enum memmodel'', verify its
6150 correctness and return the memory model enum. */
6152 static enum memmodel
6154 {
6155 rtx op;
6157 location_t loc
6160 /* If the parameter is not a constant, it's a run time value so we'll just
6161 convert it to MEMMODEL_SEQ_CST to avoid annoying runtime checking. */
6171 {
6175 }
6177 /* Should never see a user explicit SYNC memodel model, so >= LAST works. */
6179 {
6183 }
6185 /* Workaround for Bugzilla 59448. GCC doesn't track consume properly, so
6186 be conservative and promote consume to acquire. */
6191 }
6193 /* Expand the __atomic_exchange intrinsic:
6194 TYPE __atomic_exchange (TYPE *object, TYPE desired, enum memmodel)
6195 EXP is the CALL_EXPR.
6196 TARGET is an optional place for us to store the results. */
6198 static rtx
6200 {
6209 /* Expand the operands. */
6214 }
6216 /* Expand the __atomic_compare_exchange intrinsic:
6217 bool __atomic_compare_exchange (TYPE *object, TYPE *expect,
6218 TYPE desired, BOOL weak,
6219 enum memmodel success,
6220 enum memmodel failure)
6221 EXP is the CALL_EXPR.
6222 TARGET is an optional place for us to store the results. */
6224 static rtx
6226 rtx target)
6227 {
6231 tree weak;
6233 location_t loc
6240 {
6242 "failure memory model cannot be stronger than success "
6245 }
6248 {
6250 "invalid failure memory model for "
6254 }
6260 /* Expand the operands. */
6276 /* Lest the rtl backend create a race condition with an imporoper store
6277 to memory, always create a new pseudo for OLDVAL. */
6284 /* Conditionally store back to EXPECT, lest we create a race condition
6285 with an improper store to memory. */
6286 /* ??? With a rearrangement of atomics at the gimple level, we can handle
6287 the normal case where EXPECT is totally private, i.e. a register. At
6288 which point the store can be unconditional. */
6296 }
6298 /* Helper function for expand_ifn_atomic_compare_exchange - expand
6299 internal ATOMIC_COMPARE_EXCHANGE call into __atomic_compare_exchange_N
6300 call. The weak parameter must be dropped to match the expected parameter
6301 list and the expected argument changed from value to pointer to memory
6302 slot. */
6304 static void
6306 {
6322 /* Skip the boolean weak parameter. */
6325 /* At present we only have BUILT_IN_ATOMIC_COMPARE_EXCHANGE_{1,2,4,8,16}. */
6328 built_in_function fncode
6333 fndecl);
6338 {
6345 }
6346 }
6348 /* Expand IFN_ATOMIC_COMPARE_EXCHANGE internal function. */
6350 void
6352 {
6358 tree lhs;
6360 location_t loc
6367 {
6369 "failure memory model cannot be stronger than success "
6372 }
6375 {
6377 "invalid failure memory model for "
6381 }
6384 {
6387 }
6389 /* Expand the operands. */
6402 {
6405 }
6409 {
6415 }
6416 }
6418 /* Expand the __atomic_load intrinsic:
6419 TYPE __atomic_load (TYPE *object, enum memmodel)
6420 EXP is the CALL_EXPR.
6421 TARGET is an optional place for us to store the results. */
6423 static rtx
6425 {
6426 rtx mem;
6431 {
6432 location_t loc
6437 }
6442 /* Expand the operand. */
6446 }
6449 /* Expand the __atomic_store intrinsic:
6450 void __atomic_store (TYPE *object, TYPE desired, enum memmodel)
6451 EXP is the CALL_EXPR.
6452 TARGET is an optional place for us to store the results. */
6454 static rtx
6456 {
6463 {
6464 location_t loc
6469 }
6474 /* Expand the operands. */
6479 }
6481 /* Expand the __atomic_fetch_XXX intrinsic:
6482 TYPE __atomic_fetch_XXX (TYPE *object, TYPE val, enum memmodel)
6483 EXP is the CALL_EXPR.
6484 TARGET is an optional place for us to store the results.
6485 CODE is the operation, PLUS, MINUS, ADD, XOR, or IOR.
6486 FETCH_AFTER is true if returning the result of the operation.
6487 FETCH_AFTER is false if returning the value before the operation.
6488 IGNORE is true if the result is not used.
6489 EXT_CALL is the correct builtin for an external call if this cannot be
6490 resolved to an instruction sequence. */
6492 static rtx
6496 {
6499 tree fndecl;
6500 tree addr;
6504 /* Expand the operands. */
6508 /* Only try generating instructions if inlining is turned on. */
6510 {
6514 }
6516 /* Return if a different routine isn't needed for the library call. */
6520 /* Change the call to the specified function. */
6528 /* If we will emit code after the call, the call cannot be a tail call.
6529 If it is emitted as a tail call, a barrier is emitted after it, and
6530 then all trailing code is removed. */
6534 /* Expand the call here so we can emit trailing code. */
6537 /* Replace the original function just in case it matters. */
6540 /* Then issue the arithmetic correction to return the right result. */
6542 {
6544 {
6546 OPTAB_LIB_WIDEN);
6548 }
6549 else
6551 OPTAB_LIB_WIDEN);
6552 }
6554 }
6556 /* Expand IFN_ATOMIC_BIT_TEST_AND_* internal function. */
6558 void
6560 {
6568 optab optab;
6580 {
6595 }
6598 {
6605 }
6627 {
6632 }
6633 else
6635 OPTAB_DIRECT);
6638 }
6640 /* Expand an atomic clear operation.
6641 void _atomic_clear (BOOL *obj, enum memmodel)
6642 EXP is the call expression. */
6644 static rtx
6646 {
6647 machine_mode mode;
6656 {
6657 location_t loc
6662 }
6664 /* Try issuing an __atomic_store, and allow fallback to __sync_lock_release.
6665 Failing that, a store is issued by __atomic_store. The only way this can
6666 fail is if the bool type is larger than a word size. Unlikely, but
6667 handle it anyway for completeness. Assume a single threaded model since
6668 there is no atomic support in this case, and no barriers are required. */
6673 }
6675 /* Expand an atomic test_and_set operation.
6676 bool _atomic_test_and_set (BOOL *obj, enum memmodel)
6677 EXP is the call expression. */
6679 static rtx
6681 {
6682 rtx mem;
6684 machine_mode mode;
6691 }
6694 /* Return true if (optional) argument ARG1 of size ARG0 is always lock free on
6695 this architecture. If ARG1 is NULL, use typical alignment for size ARG0. */
6697 static tree
6699 {
6701 machine_mode mode;
6707 /* We need a corresponding integer mode for the access to be lock-free. */
6715 {
6718 /* Either this argument is null, or it's a fake pointer encoding
6719 the alignment of the object. */
6725 else
6727 }
6728 else
6729 {
6732 /* This function is usually invoked and folded immediately by the front
6733 end before anything else has a chance to look at it. The pointer
6734 parameter at this point is usually cast to a void *, so check for that
6735 and look past the cast. */
6745 /* Get the underlying type of the object. */
6748 }
6750 /* If the object has smaller alignment, the lock free routines cannot
6751 be used. */
6755 /* Check if a compare_and_swap pattern exists for the mode which represents
6756 the required size. The pattern is not allowed to fail, so the existence
6757 of the pattern indicates support is present. Also require that an
6758 atomic load exists for the required size. */
6761 else
6763 }
6765 /* Return true if the parameters to call EXP represent an object which will
6766 always generate lock free instructions. The first argument represents the
6767 size of the object, and the second parameter is a pointer to the object
6768 itself. If NULL is passed for the object, then the result is based on
6769 typical alignment for an object of the specified size. Otherwise return
6770 false. */
6772 static rtx
6774 {
6775 tree size;
6780 {
6783 }
6789 }
6791 /* Return a one or zero if it can be determined that object ARG1 of size ARG
6792 is lock free on this architecture. */
6794 static tree
6796 {
6800 /* If it isn't always lock free, don't generate a result. */
6805 }
6807 /* Return true if the parameters to call EXP represent an object which will
6808 always generate lock free instructions. The first argument represents the
6809 size of the object, and the second parameter is a pointer to the object
6810 itself. If NULL is passed for the object, then the result is based on
6811 typical alignment for an object of the specified size. Otherwise return
6812 NULL*/
6814 static rtx
6816 {
6817 tree size;
6822 {
6825 }
6830 /* If the value is known at compile time, return the RTX for it. */
6836 }
6838 /* Expand the __atomic_thread_fence intrinsic:
6839 void __atomic_thread_fence (enum memmodel)
6840 EXP is the CALL_EXPR. */
6842 static void
6844 {
6847 }
6849 /* Expand the __atomic_signal_fence intrinsic:
6850 void __atomic_signal_fence (enum memmodel)
6851 EXP is the CALL_EXPR. */
6853 static void
6855 {
6858 }
6860 /* Expand the __sync_synchronize intrinsic. */
6862 static void
6864 {
6866 }
6868 static rtx
6870 {
6876 {
6878 /* If the target is not sutitable then create a new target. */
6886 }
6889 }
6891 static void
6893 {
6899 {
6906 }
6908 }
6910 \f
6911 /* Emit code to restore the current value of stack. */
6913 static void
6915 {
6927 }
6929 /* Emit code to save the current value of stack. */
6931 static rtx
6933 {
6938 }
6940 /* Emit code to get the openacc gang, worker or vector id or size. */
6942 static rtx
6944 {
6946 rtx fallback_retval;
6949 {
6962 }
6965 {
6968 }
6972 {
6975 }
6979 {
6987 }
6996 {
6999 }
7007 }
7009 /* Expand a string compare operation using a sequence of char comparison
7010 to get rid of the calling overhead, with result going to TARGET if
7011 that's convenient.
7013 VAR_STR is the variable string source;
7014 CONST_STR is the constant string source;
7015 LENGTH is the number of chars to compare;
7016 CONST_STR_N indicates which source string is the constant string;
7017 IS_MEMCMP indicates whether it's a memcmp or strcmp.
7019 to: (assume const_str_n is 2, i.e., arg2 is a constant string)
7021 target = (int) (unsigned char) var_str[0]
7022 - (int) (unsigned char) const_str[0];
7023 if (target != 0)
7024 goto ne_label;
7025 ...
7026 target = (int) (unsigned char) var_str[length - 2]
7027 - (int) (unsigned char) const_str[length - 2];
7028 if (target != 0)
7029 goto ne_label;
7030 target = (int) (unsigned char) var_str[length - 1]
7031 - (int) (unsigned char) const_str[length - 1];
7032 ne_label:
7033 */
7035 static rtx
7039 {
7041 rtx var_rtx_array
7048 scalar_int_mode unit_mode
7054 {
7055 var_rtx
7069 }
7077 }
7079 /* Inline expansion a call to str(n)cmp, with result going to
7080 TARGET if that's convenient.
7081 If the call is not been inlined, return NULL_RTX. */
7082 static rtx
7084 {
7090 /* Do NOT apply this inlining expansion when optimizing for size or
7091 optimization level below 2. */
7099 /* On a target where the type of the call (int) has same or narrower presicion
7100 than unsigned char, give up the inlining expansion. */
7116 /* If neither strings is constant string, the call is not qualify. */
7120 /* For strncmp, if the length is not a const, not qualify. */
7122 {
7125 else
7127 }
7142 else
7151 /* If the length of the comparision is larger than the threshold,
7152 do nothing. */
7159 /* Now, start inline expansion the call. */
7163 }
7165 /* Expand a call to __builtin_speculation_safe_value_<N>. MODE
7166 represents the size of the first argument to that call, or VOIDmode
7167 if the argument is a pointer. IGNORE will be true if the result
7168 isn't used. */
7169 static rtx
7172 {
7179 {
7182 }
7186 /* An optional second argument can be used as a failsafe value on
7187 some machines. If it isn't present, then the failsafe value is
7188 assumed to be 0. */
7190 {
7193 }
7194 else
7197 /* If the result isn't used, the behavior is undefined. It would be
7198 nice to emit a warning here, but path splitting means this might
7199 happen with legitimate code. So simply drop the builtin
7200 expansion in that case; we've handled any side-effects above. */
7204 /* If we don't have a suitable target, create one to hold the result. */
7212 }
7214 /* Expand an expression EXP that calls a built-in function,
7215 with result going to TARGET if that's convenient
7216 (and in mode MODE if that's convenient).
7217 SUBTARGET may be used as the target for computing one of EXP's operands.
7218 IGNORE is nonzero if the value is to be ignored. */
7220 rtx
7223 {
7232 /* When ASan is enabled, we don't want to expand some memory/string
7233 builtins and rely on libsanitizer's hooks. This allows us to avoid
7234 redundant checks and be sure, that possible overflow will be detected
7235 by ASan. */
7240 /* When not optimizing, generate calls to library functions for a certain
7241 set of builtins. */
7255 /* The built-in function expanders test for target == const0_rtx
7256 to determine whether the function's result will be ignored. */
7260 /* If the result of a pure or const built-in function is ignored, and
7261 none of its arguments are volatile, we can avoid expanding the
7262 built-in call and just evaluate the arguments for side-effects. */
7266 {
7268 tree arg;
7269 call_expr_arg_iterator iter;
7273 {
7276 }
7279 {
7283 }
7284 }
7287 {
7305 /* Just do a normal library call if we were unable to fold
7306 the values. */
7383 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
7384 FUNCTION with a copy of the parameters described by
7385 ARGUMENTS, and ARGSIZE. It returns a block of memory
7386 allocated on the stack into which is stored all the registers
7387 that might possibly be used for returning the result of a
7388 function. ARGUMENTS is the value returned by
7389 __builtin_apply_args. ARGSIZE is the number of bytes of
7390 arguments that must be copied. ??? How should this value be
7391 computed? We'll also need a safe worst case value for varargs
7392 functions. */
7399 else
7400 {
7408 }
7410 /* __builtin_return (RESULT) causes the function to return the
7411 value described by RESULT. RESULT is address of the block of
7412 memory returned by __builtin_apply. */
7422 /* All valid uses of __builtin_va_arg_pack () are removed during
7423 inlining. */
7428 /* All valid uses of __builtin_va_arg_pack_len () are removed during
7429 inlining. */
7433 /* Return the address of the first anonymous stack arg. */
7455 /* Returns the address of the area where the structure is returned.
7456 0 otherwise. */
7462 else
7465 CASE_BUILT_IN_ALLOCA:
7615 /* Expand it as BUILT_IN_MEMCMP_EQ first. If not successful, change it
7616 back to a BUILT_IN_STRCMP. Remember to delete the 3rd paramater
7617 when changing it to a strcmp call. */
7623 /* Change this call back to a BUILT_IN_STRCMP. */
7627 /* Delete the last parameter. */
7634 /* FALLTHROUGH */
7642 /* Expand it as BUILT_IN_MEMCMP_EQ first. If not successful, change it
7643 back to a BUILT_IN_STRNCMP. */
7649 /* Change it back to a BUILT_IN_STRNCMP. */
7652 /* FALLTHROUGH */
7667 {
7670 }
7674 /* This should have been lowered to the builtins below. */
7678 /* __builtin_setjmp_setup is passed a pointer to an array of five words
7679 and the receiver label. */
7681 {
7687 /* This is copied from the handling of non-local gotos. */
7689 nonlocal_goto_handler_labels
7691 nonlocal_goto_handler_labels);
7692 /* ??? Do not let expand_label treat us as such since we would
7693 not want to be both on the list of non-local labels and on
7694 the list of forced labels. */
7697 }
7701 /* __builtin_setjmp_receiver is passed the receiver label. */
7703 {
7709 }
7712 /* __builtin_longjmp is passed a pointer to an array of five words.
7713 It's similar to the C library longjmp function but works with
7714 __builtin_setjmp above. */
7717 {
7723 {
7726 }
7730 }
7739 /* This updates the setjmp buffer that is its argument with the value
7740 of the current stack pointer. */
7743 {
7744 rtx buf_addr
7749 }
7769 /* Various hooks for the DWARF 2 __throw routine. */
7775 #ifdef DWARF2_UNWIND_INFO
7781 #endif
7983 mode = get_builtin_sync_mode
7995 mode = get_builtin_sync_mode
8042 {
8046 mode =
8052 /* If this is turned into an external library call, the weak parameter
8053 must be dropped to match the expected parameter list. */
8058 /* Skip the boolean weak parameter. */
8063 }
8092 {
8102 }
8108 {
8118 }
8124 {
8134 }
8140 {
8150 }
8156 {
8166 }
8172 {
8182 }
8319 /* Do library call, if we failed to expand the builtin when
8320 folding. */
8340 }
8342 /* The switch statement above can drop through to cause the function
8343 to be called normally. */
8345 }
8347 /* Determine whether a tree node represents a call to a built-in
8348 function. If the tree T is a call to a built-in function with
8349 the right number of arguments of the appropriate types, return
8350 the DECL_FUNCTION_CODE of the call, e.g. BUILT_IN_SQRT.
8351 Otherwise the return value is END_BUILTINS. */
8353 enum built_in_function
8355 {
8358 const_call_expr_arg_iterator iter;
8370 {
8371 /* If a function doesn't take a variable number of arguments,
8372 the last element in the list will have type `void'. */
8375 {
8379 }
8388 {
8391 }
8393 {
8396 }
8398 {
8401 }
8403 {
8406 }
8407 else
8409 }
8411 /* Variable-length argument list. */
8413 }
8415 /* Fold a call to __builtin_constant_p, if we know its argument ARG will
8416 evaluate to a constant. */
8418 static tree
8420 {
8421 /* We return 1 for a numeric type that's known to be a constant
8422 value at compile-time or for an aggregate type that's a
8423 literal constant. */
8426 /* If we know this is a constant, emit the constant of one. */
8432 {
8439 }
8441 /* If this expression has side effects, show we don't know it to be a
8442 constant. Likewise if it's a pointer or aggregate type since in
8443 those case we only want literals, since those are only optimized
8444 when generating RTL, not later.
8445 And finally, if we are compiling an initializer, not code, we
8446 need to return a definite result now; there's not going to be any
8447 more optimization done. */
8452 || folding_initializer
8457 }
8459 /* Create builtin_expect or builtin_expect_with_probability
8460 with PRED and EXPECTED as its arguments and return it as a truthvalue.
8461 Fortran FE can also produce builtin_expect with PREDICTOR as third argument.
8462 builtin_expect_with_probability instead uses third argument as PROBABILITY
8463 value. */
8465 static tree
8468 {
8483 else
8485 predictor);
8489 }
8491 /* Fold a call to builtin_expect with arguments ARG0, ARG1, ARG2, ARG3. Return
8492 NULL_TREE if no simplification is possible. */
8494 tree
8496 tree arg3)
8497 {
8501 /* Distribute the expected value over short-circuiting operators.
8502 See through the cast from truthvalue_type_node to long. */
8509 /* If this is a builtin_expect within a builtin_expect keep the
8510 inner one. See through a comparison against a constant. It
8511 might have been added to create a thruthvalue. */
8527 {
8537 }
8539 /* If the argument isn't invariant then there's nothing else we can do. */
8543 /* If we expect that a comparison against the argument will fold to
8544 a constant return the constant. In practice, this means a true
8545 constant or the address of a non-weak symbol. */
8549 {
8550 do
8551 {
8553 }
8558 }
8560 /* Otherwise, ARG0 already has the proper type for the return value. */
8562 }
8564 /* Fold a call to __builtin_classify_type with argument ARG. */
8566 static tree
8568 {
8573 }
8575 /* Fold a call to __builtin_strlen with argument ARG. */
8577 static tree
8579 {
8582 else
8583 {
8584 c_strlen_data lendata = { };
8594 {
8600 }
8603 }
8604 }
8606 /* Fold a call to __builtin_inf or __builtin_huge_val. */
8608 static tree
8610 {
8611 REAL_VALUE_TYPE real;
8613 /* __builtin_inff is intended to be usable to define INFINITY on all
8614 targets. If an infinity is not available, INFINITY expands "to a
8615 positive constant of type float that overflows at translation
8616 time", footnote "In this case, using INFINITY will violate the
8617 constraint in 6.4.4 and thus require a diagnostic." (C99 7.12#4).
8618 Thus we pedwarn to ensure this constraint violation is
8619 diagnosed. */
8625 }
8627 /* Fold function call to builtin sincos, sincosf, or sincosl. Return
8628 NULL_TREE if no simplification can be made. */
8630 static tree
8633 {
8634 tree type;
8644 /* Calculate the result when the argument is a constant. */
8649 /* Canonicalize sincos to cexpi. */
8651 {
8654 }
8656 {
8663 }
8675 }
8677 /* Fold function call to builtin memcmp with arguments ARG1 and ARG2.
8678 Return NULL_TREE if no simplification can be made. */
8680 static tree
8682 {
8688 /* If the LEN parameter is zero, return zero. */
8693 /* If ARG1 and ARG2 are the same (and not volatile), return zero. */
8697 /* If len parameter is one, return an expression corresponding to
8698 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
8700 {
8702 tree cst_uchar_ptr_node
8705 tree ind1
8709 cst_uchar_ptr_node,
8710 arg1)));
8711 tree ind2
8715 cst_uchar_ptr_node,
8716 arg2)));
8718 }
8721 }
8723 /* Fold a call to builtin isascii with argument ARG. */
8725 static tree
8727 {
8730 else
8731 {
8732 /* Transform isascii(c) -> ((c & ~0x7f) == 0). */
8738 }
8739 }
8741 /* Fold a call to builtin toascii with argument ARG. */
8743 static tree
8745 {
8749 /* Transform toascii(c) -> (c & 0x7f). */
8752 }
8754 /* Fold a call to builtin isdigit with argument ARG. */
8756 static tree
8758 {
8761 else
8762 {
8763 /* Transform isdigit(c) -> (unsigned)(c) - '0' <= 9. */
8764 /* According to the C standard, isdigit is unaffected by locale.
8765 However, it definitely is affected by the target character set. */
8766 unsigned HOST_WIDE_INT target_digit0
8777 }
8778 }
8780 /* Fold a call to fabs, fabsf or fabsl with argument ARG. */
8782 static tree
8784 {
8790 }
8792 /* Fold a call to abs, labs, llabs or imaxabs with argument ARG. */
8794 static tree
8796 {
8802 }
8804 /* Fold a call to builtin carg(a+bi) -> atan2(b,a). */
8806 static tree
8808 {
8811 {
8815 {
8820 }
8821 }
8824 }
8826 /* Fold a call to builtin frexp, we can assume the base is 2. */
8828 static tree
8830 {
8841 /* Proceed if a valid pointer type was passed in. */
8843 {
8848 {
8850 /* For +-0, return (*exp = 0, +-0). */
8856 /* For +-NaN or +-Inf, *exp is unspecified, return arg0. */
8859 {
8860 /* Since the frexp function always expects base 2, and in
8861 GCC normalized significands are already in the range
8862 [0.5, 1.0), we have exactly what frexp wants. */
8867 }
8871 }
8873 /* Create the COMPOUND_EXPR (*arg1 = trunc, frac). */
8877 }
8880 }
8882 /* Fold a call to builtin modf. */
8884 static tree
8886 {
8897 /* Proceed if a valid pointer type was passed in. */
8899 {
8904 {
8907 /* For +-NaN or +-0, return (*arg1 = arg0, arg0). */
8911 /* For +-Inf, return (*arg1 = arg0, +-0). */
8917 /* Return (*arg1 = trunc(arg0), arg0-trunc(arg0)). */
8920 /* If the original number was negative and already
8921 integral, then the fractional part is -0.0. */
8925 }
8927 /* Create the COMPOUND_EXPR (*arg1 = trunc, frac). */
8933 }
8936 }
8938 /* Given a location LOC, an interclass builtin function decl FNDECL
8939 and its single argument ARG, return an folded expression computing
8940 the same, or NULL_TREE if we either couldn't or didn't want to fold
8941 (the latter happen if there's an RTL instruction available). */
8943 static tree
8945 {
8946 machine_mode mode;
8958 /* If there is no optab, try generic code. */
8960 {
8961 tree result;
8964 {
8965 /* isinf(x) -> isgreater(fabs(x),DBL_MAX). */
8968 REAL_VALUE_TYPE r;
8972 {
8973 /* NaN and Inf are encoded in the high-order double value
8974 only. The low-order value is not significant. */
8978 }
8985 }
8988 {
8989 /* isfinite(x) -> islessequal(fabs(x),DBL_MAX). */
8992 REAL_VALUE_TYPE r;
8996 {
8997 /* NaN and Inf are encoded in the high-order double value
8998 only. The low-order value is not significant. */
9002 }
9008 /*result = fold_build2_loc (loc, UNGT_EXPR,
9009 TREE_TYPE (TREE_TYPE (fndecl)),
9010 fold_build1_loc (loc, ABS_EXPR, type, arg),
9011 build_real (type, r));
9012 result = fold_build1_loc (loc, TRUTH_NOT_EXPR,
9013 TREE_TYPE (TREE_TYPE (fndecl)),
9014 result);*/
9016 }
9018 {
9019 /* isnormal(x) -> isgreaterequal(fabs(x),DBL_MIN) &
9020 islessequal(fabs(x),DBL_MAX). */
9030 {
9031 /* Use double to test the normal range of IBM extended
9032 precision. Emin for IBM extended precision is
9033 different to emin for IEEE double, being 53 higher
9034 since the low double exponent is at least 53 lower
9035 than the high double exponent. */
9039 }
9051 {
9052 /* Testing the high end of the range is done just using
9053 the high double, using the same test as isfinite().
9054 For the subnormal end of the range we first test the
9055 high double, then if its magnitude is equal to the
9056 limit of 0x1p-969, we test whether the low double is
9057 non-zero and opposite sign to the high double. */
9073 integer_type_node,
9079 }
9080 else
9081 {
9082 tree const isge_fn
9085 }
9089 }
9092 }
9095 }
9097 /* Fold a call to __builtin_isnan(), __builtin_isinf, __builtin_finite.
9098 ARG is the argument for the call. */
9100 static tree
9102 {
9109 {
9117 {
9118 /* isinf_sign(x) -> isinf(x) ? (signbit(x) ? -1 : 1) : 0 */
9119 /* In a boolean context, GCC will fold the inner COND_EXPR to
9120 1. So e.g. "if (isinf_sign(x))" would be folded to just
9121 "if (isinf(x) ? 1 : 0)" which becomes "if (isinf(x))". */
9129 {
9142 integer_zero_node);
9143 }
9146 }
9159 {
9162 {
9163 /* NaN and Inf are encoded in the high-order double value
9164 only. The low-order value is not significant. */
9166 }
9167 }
9173 }
9174 }
9176 /* Fold a call to __builtin_fpclassify(int, int, int, int, int, ...).
9177 This builtin will generate code to return the appropriate floating
9178 point classification depending on the value of the floating point
9179 number passed in. The possible return values must be supplied as
9180 int arguments to the call in the following order: FP_NAN, FP_INFINITE,
9181 FP_NORMAL, FP_SUBNORMAL and FP_ZERO. The ellipses is for exactly
9182 one floating point argument which is "type generic". */
9184 static tree
9186 {
9189 machine_mode mode;
9190 REAL_VALUE_TYPE r;
9193 /* Verify the required arguments in the original call. */
9213 /* fpclassify(x) ->
9214 isnan(x) ? FP_NAN :
9215 (fabs(x) == Inf ? FP_INFINITE :
9216 (fabs(x) >= DBL_MIN ? FP_NORMAL :
9217 (x == 0 ? FP_ZERO : FP_SUBNORMAL))). */
9231 {
9237 }
9240 {
9243 }
9246 }
9248 /* Fold a call to an unordered comparison function such as
9249 __builtin_isgreater(). FNDECL is the FUNCTION_DECL for the function
9250 being called and ARG0 and ARG1 are the arguments for the call.
9251 UNORDERED_CODE and ORDERED_CODE are comparison codes that give
9252 the opposite of the desired result. UNORDERED_CODE is used
9253 for modes that can hold NaNs and ORDERED_CODE is used for
9254 the rest. */
9256 static tree
9260 {
9274 /* Choose the wider of two real types. */
9286 {
9290 }
9295 }
9297 /* Fold __builtin_{,s,u}{add,sub,mul}{,l,ll}_overflow, either into normal
9298 arithmetics if it can never overflow, or into internal functions that
9299 return both result of arithmetics and overflowed boolean flag in
9300 a complex integer result, or some other check for overflow.
9301 Similarly fold __builtin_{add,sub,mul}_overflow_p to just the overflow
9302 checking part of that. */
9304 static tree
9307 {
9309 /* The code of the expression corresponding to the built-in. */
9314 {
9317 /* FALLTHRU */
9330 /* FALLTHRU */
9343 /* FALLTHRU */
9356 }
9358 /* For the "generic" overloads, the first two arguments can have different
9359 types and the last argument determines the target type to use to check
9360 for overflow. The arguments of the other overloads all have the same
9361 type. */
9364 /* For the __builtin_{add,sub,mul}_overflow_p builtins, when the first two
9365 arguments are constant, attempt to fold the built-in call into a constant
9366 expression indicating whether or not it detected an overflow. */
9370 /* Perform the computation in the target type and check for overflow. */
9374 arg2);
9378 {
9386 }
9387 else
9388 {
9396 }
9402 tree store
9405 }
9407 /* Fold a call to __builtin_FILE to a constant string. */
9411 {
9413 {
9414 /* The documentation says this builtin is equivalent to the preprocessor
9415 __FILE__ macro so it appears appropriate to use the same file prefix
9416 mappings. */
9419 }
9422 }
9424 /* Fold a call to __builtin_FUNCTION to a constant string. */
9428 {
9435 }
9437 /* Fold a call to __builtin_LINE to an integer constant. */
9441 {
9443 }
9445 /* Fold a call to built-in function FNDECL with 0 arguments.
9446 This function returns NULL_TREE if no simplification was possible. */
9448 static tree
9450 {
9454 {
9480 }
9482 }
9484 /* Fold a call to built-in function FNDECL with 1 argument, ARG0.
9485 This function returns NULL_TREE if no simplification was possible. */
9487 static tree
9489 {
9500 {
9502 {
9505 /* Gimplification will pull the CALL_EXPR for the builtin out of
9506 an if condition. When not optimizing, we'll not CSE it back.
9507 To avoid link error types of regressions, return false now. */
9512 }
9568 {
9573 }
9579 {
9584 }
9605 }
9609 }
9611 /* Fold a call to built-in function FNDECL with 2 arguments, ARG0 and ARG1.
9612 This function returns NULL_TREE if no simplification was possible. */
9614 static tree
9616 {
9628 {
9672 NOP_EXPR);
9674 /* We do the folding for va_start in the expander. */
9689 }
9691 }
9693 /* Fold a call to built-in function FNDECL with 3 arguments, ARG0, ARG1,
9694 and ARG2.
9695 This function returns NULL_TREE if no simplification was possible. */
9697 static tree
9700 {
9714 {
9763 }
9765 }
9767 /* Fold a call to built-in function FNDECL. ARGS is an array of NARGS
9768 arguments. IGNORE is true if the result of the
9769 function call is ignored. This function returns NULL_TREE if no
9770 simplification was possible. */
9772 tree
9774 {
9778 {
9794 }
9796 {
9800 }
9802 }
9804 /* Construct a new CALL_EXPR to FNDECL using the tail of the argument
9805 list ARGS along with N new arguments in NEWARGS. SKIP is the number
9806 of arguments in ARGS to be omitted. OLDNARGS is the number of
9807 elements in ARGS. */
9809 static tree
9812 {
9817 {
9825 }
9826 else
9830 }
9832 /* Return true if FNDECL shouldn't be folded right now.
9833 If a built-in function has an inline attribute always_inline
9834 wrapper, defer folding it after always_inline functions have
9835 been inlined, otherwise e.g. -D_FORTIFY_SOURCE checking
9836 might not be performed. */
9838 bool
9840 {
9843 && cfun
9846 }
9848 /* A wrapper function for builtin folding that prevents warnings for
9849 "statement without effect" and the like, caused by removing the
9850 call node earlier than the warning is generated. */
9852 tree
9854 {
9858 /* If CALL_EXPR_VA_ARG_PACK is set, the arguments aren't finalized
9859 yet. Defer folding until we see all the arguments
9860 (after inlining). */
9862 {
9865 /* Before gimplification CALL_EXPR_VA_ARG_PACK is not set, but
9866 instead last argument is __builtin_va_arg_pack (). Defer folding
9867 even in that case, until arguments are finalized. */
9869 {
9873 }
9881 else
9882 {
9887 }
9888 }
9890 }
9892 /* Fold a CALL_EXPR with type TYPE with FN as the function expression.
9893 N arguments are passed in the array ARGARRAY. Return a folded
9894 expression or NULL_TREE if no simplification was possible. */
9896 tree
9898 tree fn,
9901 {
9908 {
9909 /* If last argument is __builtin_va_arg_pack (), arguments to this
9910 function are not finalized yet. Defer folding until they are. */
9912 {
9916 }
9921 else
9923 }
9926 }
9928 /* Construct a new CALL_EXPR using the tail of the argument list of EXP
9929 along with N new arguments specified as the "..." parameters. SKIP
9930 is the number of arguments in EXP to be omitted. This function is used
9931 to do varargs-to-varargs transformations. */
9933 static tree
9935 {
9937 tree t;
9945 }
9947 /* Validate a single argument ARG against a tree code CODE representing
9948 a type. Return true when argument is valid. */
9950 static bool
9952 {
9960 }
9962 /* This function validates the types of a function call argument list
9963 against a specified list of tree_codes. If the last specifier is a 0,
9964 that represents an ellipses, otherwise the last specifier must be a
9965 VOID_TYPE.
9967 This is the GIMPLE version of validate_arglist. Eventually we want to
9968 completely convert builtins.c to work from GIMPLEs and the tree based
9969 validate_arglist will then be removed. */
9971 bool
9973 {
9977 const_tree arg;
9983 do
9984 {
9987 {
9989 /* This signifies an ellipses, any further arguments are all ok. */
9993 /* This signifies an endlink, if no arguments remain, return
9994 true, otherwise return false. */
9998 /* If no parameters remain or the parameter's code does not
9999 match the specified code, return false. Otherwise continue
10000 checking any remaining arguments. */
10005 }
10006 }
10009 /* We need gotos here since we can only have one VA_CLOSE in a
10010 function. */
10011 end: ;
10015 }
10017 /* Default target-specific builtin expander that does nothing. */
10019 rtx
10021 rtx target ATTRIBUTE_UNUSED,
10022 rtx subtarget ATTRIBUTE_UNUSED,
10023 machine_mode mode ATTRIBUTE_UNUSED,
10025 {
10027 }
10029 /* Returns true is EXP represents data that would potentially reside
10030 in a readonly section. */
10032 bool
10034 {
10044 /* Make sure we call decl_readonly_section only for trees it
10045 can handle (since it returns true for everything it doesn't
10046 understand). */
10051 else
10053 }
10055 /* Simplify a call to the strpbrk builtin. S1 and S2 are the arguments
10056 to the call, and TYPE is its return type.
10058 Return NULL_TREE if no simplification was possible, otherwise return the
10059 simplified form of the call as a tree.
10061 The simplified form may be a constant or other expression which
10062 computes the same value, but in a more efficient manner (including
10063 calls to other builtin functions).
10065 The call may contain arguments which need to be evaluated, but
10066 which are not useful to determine the result of the call. In
10067 this case we return a chain of COMPOUND_EXPRs. The LHS of each
10068 COMPOUND_EXPR will be an argument which must be evaluated.
10069 COMPOUND_EXPRs are chained through their RHS. The RHS of the last
10070 COMPOUND_EXPR in the chain will contain the tree for the simplified
10071 form of the builtin function call. */
10073 static tree
10075 {
10079 else
10080 {
10081 tree fn;
10090 {
10092 tree tem;
10097 /* Return an offset into the constant string argument. */
10100 }
10103 /* strpbrk(x, "") == NULL.
10104 Evaluate and ignore s1 in case it had side-effects. */
10114 /* New argument list transforming strpbrk(s1, s2) to
10115 strchr(s1, s2[0]). */
10118 }
10119 }
10121 /* Simplify a call to the strspn builtin. S1 and S2 are the arguments
10122 to the call.
10124 Return NULL_TREE if no simplification was possible, otherwise return the
10125 simplified form of the call as a tree.
10127 The simplified form may be a constant or other expression which
10128 computes the same value, but in a more efficient manner (including
10129 calls to other builtin functions).
10131 The call may contain arguments which need to be evaluated, but
10132 which are not useful to determine the result of the call. In
10133 this case we return a chain of COMPOUND_EXPRs. The LHS of each
10134 COMPOUND_EXPR will be an argument which must be evaluated.
10135 COMPOUND_EXPRs are chained through their RHS. The RHS of the last
10136 COMPOUND_EXPR in the chain will contain the tree for the simplified
10137 form of the builtin function call. */
10139 static tree
10141 {
10145 else
10146 {
10149 /* If either argument is "", return NULL_TREE. */
10151 /* Evaluate and ignore both arguments in case either one has
10152 side-effects. */
10156 }
10157 }
10159 /* Simplify a call to the strcspn builtin. S1 and S2 are the arguments
10160 to the call.
10162 Return NULL_TREE if no simplification was possible, otherwise return the
10163 simplified form of the call as a tree.
10165 The simplified form may be a constant or other expression which
10166 computes the same value, but in a more efficient manner (including
10167 calls to other builtin functions).
10169 The call may contain arguments which need to be evaluated, but
10170 which are not useful to determine the result of the call. In
10171 this case we return a chain of COMPOUND_EXPRs. The LHS of each
10172 COMPOUND_EXPR will be an argument which must be evaluated.
10173 COMPOUND_EXPRs are chained through their RHS. The RHS of the last
10174 COMPOUND_EXPR in the chain will contain the tree for the simplified
10175 form of the builtin function call. */
10177 static tree
10179 {
10183 else
10184 {
10185 /* If the first argument is "", return NULL_TREE. */
10188 {
10189 /* Evaluate and ignore argument s2 in case it has
10190 side-effects. */
10193 }
10195 /* If the second argument is "", return __builtin_strlen(s1). */
10198 {
10201 /* If the replacement _DECL isn't initialized, don't do the
10202 transformation. */
10207 }
10209 }
10210 }
10212 /* Fold the next_arg or va_start call EXP. Returns true if there was an error
10213 produced. False otherwise. This is done so that we don't output the error
10214 or warning twice or three times. */
10216 bool
10218 {
10221 tree arg;
10222 /* There is good chance the current input_location points inside the
10223 definition of the va_start macro (perhaps on the token for
10224 builtin) in a system header, so warnings will not be emitted.
10225 Use the location in real source code. */
10226 location_t current_location =
10228 NULL);
10231 {
10234 }
10237 {
10239 {
10242 }
10244 }
10245 /* We use __builtin_va_start (ap, 0, 0) or __builtin_next_arg (0, 0)
10246 when we checked the arguments and if needed issued a warning. */
10247 else
10248 {
10250 {
10251 /* Evidently an out of date version of <stdarg.h>; can't validate
10252 va_start's second argument, but can still work as intended. */
10254 OPT_Wvarargs,
10257 }
10259 {
10262 }
10264 }
10269 /* We destructively modify the call to be __builtin_va_start (ap, 0)
10270 or __builtin_next_arg (0) the first time we see it, after checking
10271 the arguments and if needed issuing a warning. */
10273 {
10276 /* Strip off all nops for the sake of the comparison. This
10277 is not quite the same as STRIP_NOPS. It does more.
10278 We must also strip off INDIRECT_EXPR for C++ reference
10279 parameters. */
10284 {
10285 /* FIXME: Sometimes with the tree optimizers we can get the
10286 not the last argument even though the user used the last
10287 argument. We just warn and set the arg to be the last
10288 argument so that we will get wrong-code because of
10289 it. */
10291 OPT_Wvarargs,
10293 }
10295 /* Undefined by C99 7.15.1.4p4 (va_start):
10296 "If the parameter parmN is declared with the register storage
10297 class, with a function or array type, or with a type that is
10298 not compatible with the type that results after application of
10299 the default argument promotions, the behavior is undefined."
10300 */
10302 {
10304 OPT_Wvarargs,
10305 "undefined behavior when second parameter of "
10307 }
10309 /* We want to verify the second parameter just once before the tree
10310 optimizers are run and then avoid keeping it in the tree,
10311 as otherwise we could warn even for correct code like:
10312 void foo (int i, ...)
10313 { va_list ap; i++; va_start (ap, i); va_end (ap); } */
10316 else
10318 }
10320 }
10323 /* Expand a call EXP to __builtin_object_size. */
10325 static rtx
10327 {
10328 tree ost;
10333 {
10338 }
10346 {
10351 }
10356 }
10358 /* Expand EXP, a call to the __mem{cpy,pcpy,move,set}_chk builtin.
10359 FCODE is the BUILT_IN_* to use.
10360 Return NULL_RTX if we failed; the caller should emit a normal call,
10361 otherwise try to get the result in TARGET, if convenient (and in
10362 mode MODE if that's convenient). */
10364 static rtx
10367 {
10369 POINTER_TYPE,
10370 fcode == BUILT_IN_MEMSET_CHK
10387 {
10388 /* Avoid transforming the checking call to an ordinary one when
10389 an overflow has been detected or when the call couldn't be
10390 validated because the size is not constant. */
10395 /* If __builtin_mem{cpy,pcpy,move,set}_chk is used, assume
10396 mem{cpy,pcpy,move,set} is available. */
10398 {
10413 }
10422 }
10425 else
10426 {
10429 /* If DEST is not a pointer type, call the normal function. */
10433 /* If SRC and DEST are the same (and not volatile), do nothing. */
10435 {
10436 tree expr;
10439 {
10440 /* Evaluate and ignore LEN in case it has side-effects. */
10443 }
10447 }
10449 /* __memmove_chk special case. */
10451 {
10457 /* If src is categorized for a readonly section we can use
10458 normal __memcpy_chk. */
10460 {
10469 }
10470 }
10472 }
10473 }
10475 /* Emit warning if a buffer overflow is detected at compile time. */
10477 static void
10479 {
10480 /* The source string. */
10482 /* The size of the destination object. */
10484 /* The string that is being concatenated with (as in __strcat_chk)
10485 or null if it isn't. */
10487 /* The maximum length of the source sequence in a bounded operation
10488 (such as __strncat_chk) or null if the operation isn't bounded
10489 (such as __strcat_chk). */
10491 /* The exact size of the access (such as in __strncpy_chk). */
10495 {
10503 /* For __strcat_chk the warning will be emitted only if overflowing
10504 by at least strlen (dest) + 1 bytes. */
10531 }
10534 {
10535 /* Check __strncat_chk. There is no way to determine the length
10536 of the string to which the source string is being appended so
10537 just warn when the length of the source string is not known. */
10540 }
10542 /* The destination argument is the first one for all built-ins above. */
10546 }
10548 /* Emit warning if a buffer overflow is detected at compile time
10549 in __sprintf_chk/__vsprintf_chk calls. */
10551 static void
10553 {
10558 /* Verify the required arguments in the original call. */
10568 /* Check whether the format is a literal string constant. */
10576 /* If the format doesn't contain % args or %%, we know its size. */
10579 /* If the format is "%s" and first ... argument is a string literal,
10580 we know it too. */
10583 {
10584 tree arg;
10595 }
10596 else
10599 /* Add one for the terminating nul. */
10604 }
10606 /* Emit warning if a free is called with address of a variable. */
10608 static void
10610 {
10627 else
10630 }
10632 /* Fold a call to __builtin_object_size with arguments PTR and OST,
10633 if possible. */
10635 static tree
10637 {
10654 /* __builtin_object_size doesn't evaluate side-effects in its arguments;
10655 if there are any side-effects, it returns (size_t) -1 for types 0 and 1
10656 and (size_t) 0 for types 2 and 3. */
10661 {
10665 }
10667 {
10668 /* If object size is not known yet, delay folding until
10669 later. Maybe subsequent passes will help determining
10670 it. */
10674 }
10677 }
10679 /* Builtins with folding operations that operate on "..." arguments
10680 need special handling; we need to store the arguments in a convenient
10681 data structure before attempting any folding. Fortunately there are
10682 only a few builtins that fall into this category. FNDECL is the
10683 function, EXP is the CALL_EXPR for the call. */
10685 static tree
10687 {
10692 {
10699 }
10701 {
10706 }
10708 }
10710 /* Initialize format string characters in the target charset. */
10712 bool
10714 {
10717 {
10740 }
10742 }
10744 /* Helper function for do_mpfr_arg*(). Ensure M is a normal number
10745 and no overflow/underflow occurred. INEXACT is true if M was not
10746 exactly calculated. TYPE is the tree type for the result. This
10747 function assumes that you cleared the MPFR flags and then
10748 calculated M to see if anything subsequently set a flag prior to
10749 entering this function. Return NULL_TREE if any checks fail. */
10751 static tree
10753 {
10754 /* Proceed iff we get a normal number, i.e. not NaN or Inf and no
10755 overflow/underflow occurred. If -frounding-math, proceed iff the
10756 result of calling FUNC was exact. */
10759 {
10760 REAL_VALUE_TYPE rr;
10763 /* Proceed iff GCC's REAL_VALUE_TYPE can hold the MPFR value,
10764 check for overflow/underflow. If the REAL_VALUE_TYPE is zero
10765 but the mpft_t is not, then we underflowed in the
10766 conversion. */
10769 {
10770 REAL_VALUE_TYPE rmode;
10773 /* Proceed iff the specified mode can hold the value. */
10776 }
10777 }
10779 }
10781 /* Helper function for do_mpc_arg*(). Ensure M is a normal complex
10782 number and no overflow/underflow occurred. INEXACT is true if M
10783 was not exactly calculated. TYPE is the tree type for the result.
10784 This function assumes that you cleared the MPFR flags and then
10785 calculated M to see if anything subsequently set a flag prior to
10786 entering this function. Return NULL_TREE if any checks fail, if
10787 FORCE_CONVERT is true, then bypass the checks. */
10789 static tree
10791 {
10792 /* Proceed iff we get a normal number, i.e. not NaN or Inf and no
10793 overflow/underflow occurred. If -frounding-math, proceed iff the
10794 result of calling FUNC was exact. */
10799 {
10804 /* Proceed iff GCC's REAL_VALUE_TYPE can hold the MPFR values,
10805 check for overflow/underflow. If the REAL_VALUE_TYPE is zero
10806 but the mpft_t is not, then we underflowed in the
10807 conversion. */
10812 {
10817 /* Proceed iff the specified mode can hold the value. */
10823 }
10824 }
10826 }
10828 /* If arguments ARG0 and ARG1 are REAL_CSTs, call mpfr_remquo() to set
10829 the pointer *(ARG_QUO) and return the result. The type is taken
10830 from the type of ARG0 and is used for setting the precision of the
10831 calculation and results. */
10833 static tree
10835 {
10842 /* To proceed, MPFR must exactly represent the target floating point
10843 format, which only happens when the target base equals two. */
10847 {
10852 {
10856 tree result_rem;
10865 /* Remquo is independent of the rounding mode, so pass
10866 inexact=0 to do_mpfr_ckconv(). */
10870 {
10871 /* MPFR calculates quo in the host's long so it may
10872 return more bits in quo than the target int can hold
10873 if sizeof(host long) > sizeof(target int). This can
10874 happen even for native compilers in LP64 mode. In
10875 these cases, modulo the quo value with the largest
10876 number that the target int can hold while leaving one
10877 bit for the sign. */
10881 /* Dereference the quo pointer argument. */
10883 /* Proceed iff a valid pointer type was passed in. */
10885 {
10886 /* Set the value. */
10887 tree result_quo
10890 integer_quo));
10892 /* Combine the quo assignment with the rem. */
10895 }
10896 }
10897 }
10898 }
10900 }
10902 /* If ARG is a REAL_CST, call mpfr_lgamma() on it and return the
10903 resulting value as a tree with type TYPE. The mpfr precision is
10904 set to the precision of TYPE. We assume that this mpfr function
10905 returns zero if the result could be calculated exactly within the
10906 requested precision. In addition, the integer pointer represented
10907 by ARG_SG will be dereferenced and set to the appropriate signgam
10908 (-1,1) value. */
10910 static tree
10912 {
10917 /* To proceed, MPFR must exactly represent the target floating point
10918 format, which only happens when the target base equals two. Also
10919 verify ARG is a constant and that ARG_SG is an int pointer. */
10924 {
10927 /* In addition to NaN and Inf, the argument cannot be zero or a
10928 negative integer. */
10932 {
10937 mpfr_t m;
10938 tree result_lg;
10947 {
10948 tree result_sg;
10950 /* Dereference the arg_sg pointer argument. */
10952 /* Assign the signgam value into *arg_sg. */
10957 /* Combine the signgam assignment with the lgamma result. */
10960 }
10961 }
10962 }
10965 }
10967 /* If arguments ARG0 and ARG1 are a COMPLEX_CST, call the two-argument
10968 mpc function FUNC on it and return the resulting value as a tree
10969 with type TYPE. The mpfr precision is set to the precision of
10970 TYPE. We assume that function FUNC returns zero if the result
10971 could be calculated exactly within the requested precision. If
10972 DO_NONFINITE is true, then fold expressions containing Inf or NaN
10973 in the arguments and/or results. */
10975 tree
10978 {
10984 /* To proceed, MPFR must exactly represent the target floating point
10985 format, which only happens when the target base equals two. */
10991 {
11000 {
11020 }
11021 }
11024 }
11026 /* A wrapper function for builtin folding that prevents warnings for
11027 "statement without effect" and the like, caused by removing the
11028 call node earlier than the warning is generated. */
11030 tree
11032 {
11038 {
11047 {
11049 }
11050 else
11051 {
11054 {
11055 /* Propagate location information from original call to
11056 expansion of builtin. Otherwise things like
11057 maybe_emit_chk_warning, that operate on the expansion
11058 of a builtin, will use the wrong location information. */
11060 {
11068 }
11070 }
11071 }
11072 }
11074 }
11076 /* Look up the function in builtin_decl that corresponds to DECL
11077 and set ASMSPEC as its user assembler name. DECL must be a
11078 function decl that declares a builtin. */
11080 void
11082 {
11091 {
11095 }
11096 }
11098 /* Return true if DECL is a builtin that expands to a constant or similarly
11099 simple code. */
11100 bool
11102 {
11105 {
11106 /* Builtins that expand to constants. */
11111 /* Simple register moves or loads from stack. */
11122 /* Exception state returns or moves registers around. */
11130 }
11133 }
11135 /* Return true if DECL is a builtin that is not expensive, i.e., they are
11136 most probably expanded inline into reasonably simple code. This is a
11137 superset of is_simple_builtin. */
11138 bool
11140 {
11147 {
11149 CASE_BUILT_IN_ALLOCA:
11215 }
11218 }
11220 /* Return true if T is a constant and the value cast to a target char
11221 can be represented by a host char.
11222 Store the casted char constant in *P if so. */
11224 bool
11226 {
11232 }