1 /* Expand builtin functions.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
30 #include "hard-reg-set.h"
33 #include "insn-config.h"
39 #include "typeclass.h"
45 #define CALLED_AS_BUILT_IN(NODE) \
46 (!strncmp (IDENTIFIER_POINTER (DECL_NAME (NODE)), "__builtin_", 10))
48 /* Register mappings for target machines without register windows. */
49 #ifndef INCOMING_REGNO
50 #define INCOMING_REGNO(OUT) (OUT)
52 #ifndef OUTGOING_REGNO
53 #define OUTGOING_REGNO(IN) (IN)
56 #ifndef PAD_VARARGS_DOWN
57 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
60 /* Define the names of the builtin function types and codes. */
61 const char *const built_in_class_names[4]
62 = {"NOT_BUILT_IN", "BUILT_IN_FRONTEND", "BUILT_IN_MD", "BUILT_IN_NORMAL"};
64 #define DEF_BUILTIN(X, N, C, T, LT, B, F, NA) STRINGX(X),
65 const char *const built_in_names[(int) END_BUILTINS] =
67 #include "builtins.def"
71 /* Setup an array of _DECL trees, make sure each element is
72 initialized to NULL_TREE. */
73 tree built_in_decls[(int) END_BUILTINS];
75 tree (*lang_type_promotes_to) PARAMS ((tree));
77 static int get_pointer_alignment PARAMS ((tree, unsigned));
78 static tree c_strlen PARAMS ((tree));
79 static const char *c_getstr PARAMS ((tree));
80 static rtx c_readstr PARAMS ((const char *,
82 static int target_char_cast PARAMS ((tree, char *));
83 static rtx get_memory_rtx PARAMS ((tree));
84 static int apply_args_size PARAMS ((void));
85 static int apply_result_size PARAMS ((void));
86 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
87 static rtx result_vector PARAMS ((int, rtx));
89 static rtx expand_builtin_setjmp PARAMS ((tree, rtx));
90 static rtx expand_builtin_apply_args PARAMS ((void));
91 static rtx expand_builtin_apply_args_1 PARAMS ((void));
92 static rtx expand_builtin_apply PARAMS ((rtx, rtx, rtx));
93 static void expand_builtin_return PARAMS ((rtx));
94 static int type_to_class PARAMS ((tree));
95 static rtx expand_builtin_classify_type PARAMS ((tree));
96 static rtx expand_builtin_mathfn PARAMS ((tree, rtx, rtx));
97 static rtx expand_builtin_constant_p PARAMS ((tree));
98 static rtx expand_builtin_args_info PARAMS ((tree));
99 static rtx expand_builtin_next_arg PARAMS ((tree));
100 static rtx expand_builtin_va_start PARAMS ((int, tree));
101 static rtx expand_builtin_va_end PARAMS ((tree));
102 static rtx expand_builtin_va_copy PARAMS ((tree));
104 static rtx expand_builtin_memcmp PARAMS ((tree, tree, rtx));
106 static rtx expand_builtin_strcmp PARAMS ((tree, rtx,
108 static rtx expand_builtin_strncmp PARAMS ((tree, rtx,
110 static rtx builtin_memcpy_read_str PARAMS ((PTR, HOST_WIDE_INT,
112 static rtx expand_builtin_strcat PARAMS ((tree, rtx,
114 static rtx expand_builtin_strncat PARAMS ((tree, rtx,
116 static rtx expand_builtin_strspn PARAMS ((tree, rtx,
118 static rtx expand_builtin_strcspn PARAMS ((tree, rtx,
120 static rtx expand_builtin_memcpy PARAMS ((tree));
121 static rtx expand_builtin_strcpy PARAMS ((tree));
122 static rtx builtin_strncpy_read_str PARAMS ((PTR, HOST_WIDE_INT,
124 static rtx expand_builtin_strncpy PARAMS ((tree, rtx,
126 static rtx builtin_memset_read_str PARAMS ((PTR, HOST_WIDE_INT,
128 static rtx expand_builtin_memset PARAMS ((tree));
129 static rtx expand_builtin_bzero PARAMS ((tree));
130 static rtx expand_builtin_strlen PARAMS ((tree, rtx));
131 static rtx expand_builtin_strstr PARAMS ((tree, rtx,
133 static rtx expand_builtin_strpbrk PARAMS ((tree, rtx,
135 static rtx expand_builtin_strchr PARAMS ((tree, rtx,
137 static rtx expand_builtin_strrchr PARAMS ((tree, rtx,
139 static rtx expand_builtin_alloca PARAMS ((tree, rtx));
140 static rtx expand_builtin_ffs PARAMS ((tree, rtx, rtx));
141 static rtx expand_builtin_frame_address PARAMS ((tree));
142 static rtx expand_builtin_fputs PARAMS ((tree, int));
143 static tree stabilize_va_list PARAMS ((tree, int));
144 static rtx expand_builtin_expect PARAMS ((tree, rtx));
145 static tree fold_builtin_constant_p PARAMS ((tree));
146 static tree fold_builtin_classify_type PARAMS ((tree));
147 static tree build_function_call_expr PARAMS ((tree, tree));
148 static int validate_arglist PARAMS ((tree, ...));
150 /* Return the alignment in bits of EXP, a pointer valued expression.
151 But don't return more than MAX_ALIGN no matter what.
152 The alignment returned is, by default, the alignment of the thing that
153 EXP points to (if it is not a POINTER_TYPE, 0 is returned).
155 Otherwise, look at the expression to see if we can do better, i.e., if the
156 expression is actually pointing at an object whose alignment is tighter. */
159 get_pointer_alignment (exp, max_align)
163 unsigned align, inner;
165 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
168 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
169 align = MIN (align, max_align);
173 switch (TREE_CODE (exp))
177 case NON_LVALUE_EXPR:
178 exp = TREE_OPERAND (exp, 0);
179 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
182 inner = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
183 align = MIN (inner, max_align);
187 /* If sum of pointer + int, restrict our maximum alignment to that
188 imposed by the integer. If not, we can't do any better than
190 if (! host_integerp (TREE_OPERAND (exp, 1), 1))
193 while (((tree_low_cst (TREE_OPERAND (exp, 1), 1))
194 & (max_align / BITS_PER_UNIT - 1))
198 exp = TREE_OPERAND (exp, 0);
202 /* See what we are pointing at and look at its alignment. */
203 exp = TREE_OPERAND (exp, 0);
204 if (TREE_CODE (exp) == FUNCTION_DECL)
205 align = FUNCTION_BOUNDARY;
206 else if (DECL_P (exp))
207 align = DECL_ALIGN (exp);
208 #ifdef CONSTANT_ALIGNMENT
209 else if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'c')
210 align = CONSTANT_ALIGNMENT (exp, align);
212 return MIN (align, max_align);
220 /* Compute the length of a C string. TREE_STRING_LENGTH is not the right
221 way, because it could contain a zero byte in the middle.
222 TREE_STRING_LENGTH is the size of the character array, not the string.
224 The value returned is of type `ssizetype'.
226 Unfortunately, string_constant can't access the values of const char
227 arrays with initializers, so neither can we do so here. */
237 src = string_constant (src, &offset_node);
241 max = TREE_STRING_LENGTH (src) - 1;
242 ptr = TREE_STRING_POINTER (src);
244 if (offset_node && TREE_CODE (offset_node) != INTEGER_CST)
246 /* If the string has an internal zero byte (e.g., "foo\0bar"), we can't
247 compute the offset to the following null if we don't know where to
248 start searching for it. */
251 for (i = 0; i < max; i++)
255 /* We don't know the starting offset, but we do know that the string
256 has no internal zero bytes. We can assume that the offset falls
257 within the bounds of the string; otherwise, the programmer deserves
258 what he gets. Subtract the offset from the length of the string,
259 and return that. This would perhaps not be valid if we were dealing
260 with named arrays in addition to literal string constants. */
262 return size_diffop (size_int (max), offset_node);
265 /* We have a known offset into the string. Start searching there for
267 if (offset_node == 0)
271 /* Did we get a long long offset? If so, punt. */
272 if (TREE_INT_CST_HIGH (offset_node) != 0)
274 offset = TREE_INT_CST_LOW (offset_node);
277 /* If the offset is known to be out of bounds, warn, and call strlen at
279 if (offset < 0 || offset > max)
281 warning ("offset outside bounds of constant string");
285 /* Use strlen to search for the first zero byte. Since any strings
286 constructed with build_string will have nulls appended, we win even
287 if we get handed something like (char[4])"abcd".
289 Since OFFSET is our starting index into the string, no further
290 calculation is needed. */
291 return ssize_int (strlen (ptr + offset));
294 /* Return a char pointer for a C string if it is a string constant
295 or sum of string constant and integer constant. */
305 src = string_constant (src, &offset_node);
309 max = TREE_STRING_LENGTH (src) - 1;
310 ptr = TREE_STRING_POINTER (src);
314 else if (TREE_CODE (offset_node) != INTEGER_CST)
318 /* Did we get a long long offset? If so, punt. */
319 if (TREE_INT_CST_HIGH (offset_node) != 0)
321 offset = TREE_INT_CST_LOW (offset_node);
322 if (offset < 0 || offset > max)
329 /* Return a CONST_INT or CONST_DOUBLE corresponding to target
330 reading GET_MODE_BITSIZE (MODE) bits from string constant
334 c_readstr (str, mode)
336 enum machine_mode mode;
342 if (GET_MODE_CLASS (mode) != MODE_INT)
347 for (i = 0; i < GET_MODE_SIZE (mode); i++)
350 if (WORDS_BIG_ENDIAN)
351 j = GET_MODE_SIZE (mode) - i - 1;
352 if (BYTES_BIG_ENDIAN != WORDS_BIG_ENDIAN
353 && GET_MODE_SIZE (mode) > UNITS_PER_WORD)
354 j = j + UNITS_PER_WORD - 2 * (j % UNITS_PER_WORD) - 1;
356 if (j > 2 * HOST_BITS_PER_WIDE_INT)
359 ch = (unsigned char) str[i];
360 c[j / HOST_BITS_PER_WIDE_INT] |= ch << (j % HOST_BITS_PER_WIDE_INT);
362 return immed_double_const (c[0], c[1], mode);
365 /* Cast a target constant CST to target CHAR and if that value fits into
366 host char type, return zero and put that value into variable pointed by
370 target_char_cast (cst, p)
374 unsigned HOST_WIDE_INT val, hostval;
376 if (TREE_CODE (cst) != INTEGER_CST
377 || CHAR_TYPE_SIZE > HOST_BITS_PER_WIDE_INT)
380 val = TREE_INT_CST_LOW (cst);
381 if (CHAR_TYPE_SIZE < HOST_BITS_PER_WIDE_INT)
382 val &= (((unsigned HOST_WIDE_INT) 1) << CHAR_TYPE_SIZE) - 1;
385 if (HOST_BITS_PER_CHAR < HOST_BITS_PER_WIDE_INT)
386 hostval &= (((unsigned HOST_WIDE_INT) 1) << HOST_BITS_PER_CHAR) - 1;
395 /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
396 times to get the address of either a higher stack frame, or a return
397 address located within it (depending on FNDECL_CODE). */
400 expand_builtin_return_addr (fndecl_code, count, tem)
401 enum built_in_function fndecl_code;
407 /* Some machines need special handling before we can access
408 arbitrary frames. For example, on the sparc, we must first flush
409 all register windows to the stack. */
410 #ifdef SETUP_FRAME_ADDRESSES
412 SETUP_FRAME_ADDRESSES ();
415 /* On the sparc, the return address is not in the frame, it is in a
416 register. There is no way to access it off of the current frame
417 pointer, but it can be accessed off the previous frame pointer by
418 reading the value from the register window save area. */
419 #ifdef RETURN_ADDR_IN_PREVIOUS_FRAME
420 if (fndecl_code == BUILT_IN_RETURN_ADDRESS)
424 /* Scan back COUNT frames to the specified frame. */
425 for (i = 0; i < count; i++)
427 /* Assume the dynamic chain pointer is in the word that the
428 frame address points to, unless otherwise specified. */
429 #ifdef DYNAMIC_CHAIN_ADDRESS
430 tem = DYNAMIC_CHAIN_ADDRESS (tem);
432 tem = memory_address (Pmode, tem);
433 tem = gen_rtx_MEM (Pmode, tem);
434 set_mem_alias_set (tem, get_frame_alias_set ());
435 tem = copy_to_reg (tem);
438 /* For __builtin_frame_address, return what we've got. */
439 if (fndecl_code == BUILT_IN_FRAME_ADDRESS)
442 /* For __builtin_return_address, Get the return address from that
444 #ifdef RETURN_ADDR_RTX
445 tem = RETURN_ADDR_RTX (count, tem);
447 tem = memory_address (Pmode,
448 plus_constant (tem, GET_MODE_SIZE (Pmode)));
449 tem = gen_rtx_MEM (Pmode, tem);
450 set_mem_alias_set (tem, get_frame_alias_set ());
455 /* Alias set used for setjmp buffer. */
456 static HOST_WIDE_INT setjmp_alias_set = -1;
458 /* Construct the leading half of a __builtin_setjmp call. Control will
459 return to RECEIVER_LABEL. This is used directly by sjlj exception
463 expand_builtin_setjmp_setup (buf_addr, receiver_label)
467 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
471 if (setjmp_alias_set == -1)
472 setjmp_alias_set = new_alias_set ();
474 #ifdef POINTERS_EXTEND_UNSIGNED
475 buf_addr = convert_memory_address (Pmode, buf_addr);
478 buf_addr = force_reg (Pmode, force_operand (buf_addr, NULL_RTX));
482 /* We store the frame pointer and the address of receiver_label in
483 the buffer and use the rest of it for the stack save area, which
484 is machine-dependent. */
486 #ifndef BUILTIN_SETJMP_FRAME_VALUE
487 #define BUILTIN_SETJMP_FRAME_VALUE virtual_stack_vars_rtx
490 mem = gen_rtx_MEM (Pmode, buf_addr);
491 set_mem_alias_set (mem, setjmp_alias_set);
492 emit_move_insn (mem, BUILTIN_SETJMP_FRAME_VALUE);
494 mem = gen_rtx_MEM (Pmode, plus_constant (buf_addr, GET_MODE_SIZE (Pmode))),
495 set_mem_alias_set (mem, setjmp_alias_set);
497 emit_move_insn (validize_mem (mem),
498 force_reg (Pmode, gen_rtx_LABEL_REF (Pmode, receiver_label)));
500 stack_save = gen_rtx_MEM (sa_mode,
501 plus_constant (buf_addr,
502 2 * GET_MODE_SIZE (Pmode)));
503 set_mem_alias_set (stack_save, setjmp_alias_set);
504 emit_stack_save (SAVE_NONLOCAL, &stack_save, NULL_RTX);
506 /* If there is further processing to do, do it. */
507 #ifdef HAVE_builtin_setjmp_setup
508 if (HAVE_builtin_setjmp_setup)
509 emit_insn (gen_builtin_setjmp_setup (buf_addr));
512 /* Tell optimize_save_area_alloca that extra work is going to
513 need to go on during alloca. */
514 current_function_calls_setjmp = 1;
516 /* Set this so all the registers get saved in our frame; we need to be
517 able to copy the saved values for any registers from frames we unwind. */
518 current_function_has_nonlocal_label = 1;
521 /* Construct the trailing part of a __builtin_setjmp call.
522 This is used directly by sjlj exception handling code. */
525 expand_builtin_setjmp_receiver (receiver_label)
526 rtx receiver_label ATTRIBUTE_UNUSED;
528 /* Clobber the FP when we get here, so we have to make sure it's
529 marked as used by this function. */
530 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
532 /* Mark the static chain as clobbered here so life information
533 doesn't get messed up for it. */
534 emit_insn (gen_rtx_CLOBBER (VOIDmode, static_chain_rtx));
536 /* Now put in the code to restore the frame pointer, and argument
537 pointer, if needed. The code below is from expand_end_bindings
538 in stmt.c; see detailed documentation there. */
539 #ifdef HAVE_nonlocal_goto
540 if (! HAVE_nonlocal_goto)
542 emit_move_insn (virtual_stack_vars_rtx, hard_frame_pointer_rtx);
544 #if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
545 if (fixed_regs[ARG_POINTER_REGNUM])
547 #ifdef ELIMINABLE_REGS
549 static struct elims {int from, to;} elim_regs[] = ELIMINABLE_REGS;
551 for (i = 0; i < ARRAY_SIZE (elim_regs); i++)
552 if (elim_regs[i].from == ARG_POINTER_REGNUM
553 && elim_regs[i].to == HARD_FRAME_POINTER_REGNUM)
556 if (i == ARRAY_SIZE (elim_regs))
559 /* Now restore our arg pointer from the address at which it
560 was saved in our stack frame.
561 If there hasn't be space allocated for it yet, make
563 if (arg_pointer_save_area == 0)
564 arg_pointer_save_area
565 = assign_stack_local (Pmode, GET_MODE_SIZE (Pmode), 0);
566 emit_move_insn (virtual_incoming_args_rtx,
567 copy_to_reg (arg_pointer_save_area));
572 #ifdef HAVE_builtin_setjmp_receiver
573 if (HAVE_builtin_setjmp_receiver)
574 emit_insn (gen_builtin_setjmp_receiver (receiver_label));
577 #ifdef HAVE_nonlocal_goto_receiver
578 if (HAVE_nonlocal_goto_receiver)
579 emit_insn (gen_nonlocal_goto_receiver ());
584 /* @@@ This is a kludge. Not all machine descriptions define a blockage
585 insn, but we must not allow the code we just generated to be reordered
586 by scheduling. Specifically, the update of the frame pointer must
587 happen immediately, not later. So emit an ASM_INPUT to act as blockage
589 emit_insn (gen_rtx_ASM_INPUT (VOIDmode, ""));
592 /* __builtin_setjmp is passed a pointer to an array of five words (not
593 all will be used on all machines). It operates similarly to the C
594 library function of the same name, but is more efficient. Much of
595 the code below (and for longjmp) is copied from the handling of
598 NOTE: This is intended for use by GNAT and the exception handling
599 scheme in the compiler and will only work in the method used by
603 expand_builtin_setjmp (arglist, target)
607 rtx buf_addr, next_lab, cont_lab;
609 if (!validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
612 if (target == 0 || GET_CODE (target) != REG
613 || REGNO (target) < FIRST_PSEUDO_REGISTER)
614 target = gen_reg_rtx (TYPE_MODE (integer_type_node));
616 buf_addr = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
618 next_lab = gen_label_rtx ();
619 cont_lab = gen_label_rtx ();
621 expand_builtin_setjmp_setup (buf_addr, next_lab);
623 /* Set TARGET to zero and branch to the continue label. */
624 emit_move_insn (target, const0_rtx);
625 emit_jump_insn (gen_jump (cont_lab));
627 emit_label (next_lab);
629 expand_builtin_setjmp_receiver (next_lab);
631 /* Set TARGET to one. */
632 emit_move_insn (target, const1_rtx);
633 emit_label (cont_lab);
635 /* Tell flow about the strange goings on. Putting `next_lab' on
636 `nonlocal_goto_handler_labels' to indicates that function
637 calls may traverse the arc back to this label. */
639 current_function_has_nonlocal_label = 1;
640 nonlocal_goto_handler_labels
641 = gen_rtx_EXPR_LIST (VOIDmode, next_lab, nonlocal_goto_handler_labels);
646 /* __builtin_longjmp is passed a pointer to an array of five words (not
647 all will be used on all machines). It operates similarly to the C
648 library function of the same name, but is more efficient. Much of
649 the code below is copied from the handling of non-local gotos.
651 NOTE: This is intended for use by GNAT and the exception handling
652 scheme in the compiler and will only work in the method used by
656 expand_builtin_longjmp (buf_addr, value)
659 rtx fp, lab, stack, insn;
660 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
662 if (setjmp_alias_set == -1)
663 setjmp_alias_set = new_alias_set ();
665 #ifdef POINTERS_EXTEND_UNSIGNED
666 buf_addr = convert_memory_address (Pmode, buf_addr);
668 buf_addr = force_reg (Pmode, buf_addr);
670 /* We used to store value in static_chain_rtx, but that fails if pointers
671 are smaller than integers. We instead require that the user must pass
672 a second argument of 1, because that is what builtin_setjmp will
673 return. This also makes EH slightly more efficient, since we are no
674 longer copying around a value that we don't care about. */
675 if (value != const1_rtx)
678 current_function_calls_longjmp = 1;
680 #ifdef HAVE_builtin_longjmp
681 if (HAVE_builtin_longjmp)
682 emit_insn (gen_builtin_longjmp (buf_addr));
686 fp = gen_rtx_MEM (Pmode, buf_addr);
687 lab = gen_rtx_MEM (Pmode, plus_constant (buf_addr,
688 GET_MODE_SIZE (Pmode)));
690 stack = gen_rtx_MEM (sa_mode, plus_constant (buf_addr,
691 2 * GET_MODE_SIZE (Pmode)));
692 set_mem_alias_set (fp, setjmp_alias_set);
693 set_mem_alias_set (lab, setjmp_alias_set);
694 set_mem_alias_set (stack, setjmp_alias_set);
696 /* Pick up FP, label, and SP from the block and jump. This code is
697 from expand_goto in stmt.c; see there for detailed comments. */
698 #if HAVE_nonlocal_goto
699 if (HAVE_nonlocal_goto)
700 /* We have to pass a value to the nonlocal_goto pattern that will
701 get copied into the static_chain pointer, but it does not matter
702 what that value is, because builtin_setjmp does not use it. */
703 emit_insn (gen_nonlocal_goto (value, lab, stack, fp));
707 lab = copy_to_reg (lab);
709 emit_move_insn (hard_frame_pointer_rtx, fp);
710 emit_stack_restore (SAVE_NONLOCAL, stack, NULL_RTX);
712 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
713 emit_insn (gen_rtx_USE (VOIDmode, stack_pointer_rtx));
714 emit_indirect_jump (lab);
718 /* Search backwards and mark the jump insn as a non-local goto.
719 Note that this precludes the use of __builtin_longjmp to a
720 __builtin_setjmp target in the same function. However, we've
721 already cautioned the user that these functions are for
722 internal exception handling use only. */
723 for (insn = get_last_insn (); insn; insn = PREV_INSN (insn))
725 if (GET_CODE (insn) == JUMP_INSN)
727 REG_NOTES (insn) = alloc_EXPR_LIST (REG_NON_LOCAL_GOTO, const0_rtx,
731 else if (GET_CODE (insn) == CALL_INSN)
736 /* Get a MEM rtx for expression EXP which is the address of an operand
737 to be used to be used in a string instruction (cmpstrsi, movstrsi, ..). */
743 rtx mem = gen_rtx_MEM (BLKmode,
744 memory_address (BLKmode,
745 expand_expr (exp, NULL_RTX,
746 ptr_mode, EXPAND_SUM)));
748 /* Get an expression we can use to find the attributes to assign to MEM.
749 If it is an ADDR_EXPR, use the operand. Otherwise, dereference it if
750 we can. First remove any nops. */
751 while ((TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
752 || TREE_CODE (exp) == NON_LVALUE_EXPR)
753 && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (exp, 0))))
754 exp = TREE_OPERAND (exp, 0);
756 if (TREE_CODE (exp) == ADDR_EXPR)
757 exp = TREE_OPERAND (exp, 0);
758 else if (POINTER_TYPE_P (TREE_TYPE (exp)))
759 exp = build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (exp)), exp);
763 set_mem_attributes (mem, exp, 0);
764 /* memcpy, memset and other builtin stringops can alias with anything. */
765 set_mem_alias_set (mem, 0);
769 /* Built-in functions to perform an untyped call and return. */
771 /* For each register that may be used for calling a function, this
772 gives a mode used to copy the register's value. VOIDmode indicates
773 the register is not used for calling a function. If the machine
774 has register windows, this gives only the outbound registers.
775 INCOMING_REGNO gives the corresponding inbound register. */
776 static enum machine_mode apply_args_mode[FIRST_PSEUDO_REGISTER];
778 /* For each register that may be used for returning values, this gives
779 a mode used to copy the register's value. VOIDmode indicates the
780 register is not used for returning values. If the machine has
781 register windows, this gives only the outbound registers.
782 INCOMING_REGNO gives the corresponding inbound register. */
783 static enum machine_mode apply_result_mode[FIRST_PSEUDO_REGISTER];
785 /* For each register that may be used for calling a function, this
786 gives the offset of that register into the block returned by
787 __builtin_apply_args. 0 indicates that the register is not
788 used for calling a function. */
789 static int apply_args_reg_offset[FIRST_PSEUDO_REGISTER];
791 /* Return the offset of register REGNO into the block returned by
792 __builtin_apply_args. This is not declared static, since it is
793 needed in objc-act.c. */
796 apply_args_register_offset (regno)
801 /* Arguments are always put in outgoing registers (in the argument
802 block) if such make sense. */
803 #ifdef OUTGOING_REGNO
804 regno = OUTGOING_REGNO(regno);
806 return apply_args_reg_offset[regno];
809 /* Return the size required for the block returned by __builtin_apply_args,
810 and initialize apply_args_mode. */
815 static int size = -1;
817 enum machine_mode mode;
819 /* The values computed by this function never change. */
822 /* The first value is the incoming arg-pointer. */
823 size = GET_MODE_SIZE (Pmode);
825 /* The second value is the structure value address unless this is
826 passed as an "invisible" first argument. */
827 if (struct_value_rtx)
828 size += GET_MODE_SIZE (Pmode);
830 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
831 if (FUNCTION_ARG_REGNO_P (regno))
833 /* Search for the proper mode for copying this register's
834 value. I'm not sure this is right, but it works so far. */
835 enum machine_mode best_mode = VOIDmode;
837 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
839 mode = GET_MODE_WIDER_MODE (mode))
840 if (HARD_REGNO_MODE_OK (regno, mode)
841 && HARD_REGNO_NREGS (regno, mode) == 1)
844 if (best_mode == VOIDmode)
845 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
847 mode = GET_MODE_WIDER_MODE (mode))
848 if (HARD_REGNO_MODE_OK (regno, mode)
849 && have_insn_for (SET, mode))
853 if (mode == VOIDmode)
856 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
857 if (size % align != 0)
858 size = CEIL (size, align) * align;
859 apply_args_reg_offset[regno] = size;
860 size += GET_MODE_SIZE (mode);
861 apply_args_mode[regno] = mode;
865 apply_args_mode[regno] = VOIDmode;
866 apply_args_reg_offset[regno] = 0;
872 /* Return the size required for the block returned by __builtin_apply,
873 and initialize apply_result_mode. */
878 static int size = -1;
880 enum machine_mode mode;
882 /* The values computed by this function never change. */
887 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
888 if (FUNCTION_VALUE_REGNO_P (regno))
890 /* Search for the proper mode for copying this register's
891 value. I'm not sure this is right, but it works so far. */
892 enum machine_mode best_mode = VOIDmode;
894 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
896 mode = GET_MODE_WIDER_MODE (mode))
897 if (HARD_REGNO_MODE_OK (regno, mode))
900 if (best_mode == VOIDmode)
901 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
903 mode = GET_MODE_WIDER_MODE (mode))
904 if (HARD_REGNO_MODE_OK (regno, mode)
905 && have_insn_for (SET, mode))
909 if (mode == VOIDmode)
912 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
913 if (size % align != 0)
914 size = CEIL (size, align) * align;
915 size += GET_MODE_SIZE (mode);
916 apply_result_mode[regno] = mode;
919 apply_result_mode[regno] = VOIDmode;
921 /* Allow targets that use untyped_call and untyped_return to override
922 the size so that machine-specific information can be stored here. */
923 #ifdef APPLY_RESULT_SIZE
924 size = APPLY_RESULT_SIZE;
930 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
931 /* Create a vector describing the result block RESULT. If SAVEP is true,
932 the result block is used to save the values; otherwise it is used to
933 restore the values. */
936 result_vector (savep, result)
940 int regno, size, align, nelts;
941 enum machine_mode mode;
943 rtx *savevec = (rtx *) alloca (FIRST_PSEUDO_REGISTER * sizeof (rtx));
946 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
947 if ((mode = apply_result_mode[regno]) != VOIDmode)
949 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
950 if (size % align != 0)
951 size = CEIL (size, align) * align;
952 reg = gen_rtx_REG (mode, savep ? regno : INCOMING_REGNO (regno));
953 mem = adjust_address (result, mode, size);
954 savevec[nelts++] = (savep
955 ? gen_rtx_SET (VOIDmode, mem, reg)
956 : gen_rtx_SET (VOIDmode, reg, mem));
957 size += GET_MODE_SIZE (mode);
959 return gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (nelts, savevec));
961 #endif /* HAVE_untyped_call or HAVE_untyped_return */
963 /* Save the state required to perform an untyped call with the same
964 arguments as were passed to the current function. */
967 expand_builtin_apply_args_1 ()
970 int size, align, regno;
971 enum machine_mode mode;
973 /* Create a block where the arg-pointer, structure value address,
974 and argument registers can be saved. */
975 registers = assign_stack_local (BLKmode, apply_args_size (), -1);
977 /* Walk past the arg-pointer and structure value address. */
978 size = GET_MODE_SIZE (Pmode);
979 if (struct_value_rtx)
980 size += GET_MODE_SIZE (Pmode);
982 /* Save each register used in calling a function to the block. */
983 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
984 if ((mode = apply_args_mode[regno]) != VOIDmode)
988 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
989 if (size % align != 0)
990 size = CEIL (size, align) * align;
992 tem = gen_rtx_REG (mode, INCOMING_REGNO (regno));
994 emit_move_insn (adjust_address (registers, mode, size), tem);
995 size += GET_MODE_SIZE (mode);
998 /* Save the arg pointer to the block. */
999 emit_move_insn (adjust_address (registers, Pmode, 0),
1000 copy_to_reg (virtual_incoming_args_rtx));
1001 size = GET_MODE_SIZE (Pmode);
1003 /* Save the structure value address unless this is passed as an
1004 "invisible" first argument. */
1005 if (struct_value_incoming_rtx)
1007 emit_move_insn (adjust_address (registers, Pmode, size),
1008 copy_to_reg (struct_value_incoming_rtx));
1009 size += GET_MODE_SIZE (Pmode);
1012 /* Return the address of the block. */
1013 return copy_addr_to_reg (XEXP (registers, 0));
1016 /* __builtin_apply_args returns block of memory allocated on
1017 the stack into which is stored the arg pointer, structure
1018 value address, static chain, and all the registers that might
1019 possibly be used in performing a function call. The code is
1020 moved to the start of the function so the incoming values are
1023 expand_builtin_apply_args ()
1025 /* Don't do __builtin_apply_args more than once in a function.
1026 Save the result of the first call and reuse it. */
1027 if (apply_args_value != 0)
1028 return apply_args_value;
1030 /* When this function is called, it means that registers must be
1031 saved on entry to this function. So we migrate the
1032 call to the first insn of this function. */
1037 temp = expand_builtin_apply_args_1 ();
1041 apply_args_value = temp;
1043 /* Put the sequence after the NOTE that starts the function.
1044 If this is inside a SEQUENCE, make the outer-level insn
1045 chain current, so the code is placed at the start of the
1047 push_topmost_sequence ();
1048 emit_insns_before (seq, NEXT_INSN (get_insns ()));
1049 pop_topmost_sequence ();
1054 /* Perform an untyped call and save the state required to perform an
1055 untyped return of whatever value was returned by the given function. */
1058 expand_builtin_apply (function, arguments, argsize)
1059 rtx function, arguments, argsize;
1061 int size, align, regno;
1062 enum machine_mode mode;
1063 rtx incoming_args, result, reg, dest, call_insn;
1064 rtx old_stack_level = 0;
1065 rtx call_fusage = 0;
1067 /* Create a block where the return registers can be saved. */
1068 result = assign_stack_local (BLKmode, apply_result_size (), -1);
1070 /* Fetch the arg pointer from the ARGUMENTS block. */
1071 incoming_args = gen_reg_rtx (Pmode);
1072 emit_move_insn (incoming_args,
1073 gen_rtx_MEM (Pmode, arguments));
1074 #ifndef STACK_GROWS_DOWNWARD
1075 incoming_args = expand_simple_binop (Pmode, MINUS, incoming_args, argsize,
1076 incoming_args, 0, OPTAB_LIB_WIDEN);
1079 /* Perform postincrements before actually calling the function. */
1082 /* Push a new argument block and copy the arguments. Do not allow
1083 the (potential) memcpy call below to interfere with our stack
1085 do_pending_stack_adjust ();
1088 /* Save the stack with nonlocal if available */
1089 #ifdef HAVE_save_stack_nonlocal
1090 if (HAVE_save_stack_nonlocal)
1091 emit_stack_save (SAVE_NONLOCAL, &old_stack_level, NULL_RTX);
1094 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
1096 /* Push a block of memory onto the stack to store the memory arguments.
1097 Save the address in a register, and copy the memory arguments. ??? I
1098 haven't figured out how the calling convention macros effect this,
1099 but it's likely that the source and/or destination addresses in
1100 the block copy will need updating in machine specific ways. */
1101 dest = allocate_dynamic_stack_space (argsize, 0, BITS_PER_UNIT);
1102 emit_block_move (gen_rtx_MEM (BLKmode, dest),
1103 gen_rtx_MEM (BLKmode, incoming_args),
1104 argsize, PARM_BOUNDARY);
1106 /* Refer to the argument block. */
1108 arguments = gen_rtx_MEM (BLKmode, arguments);
1110 /* Walk past the arg-pointer and structure value address. */
1111 size = GET_MODE_SIZE (Pmode);
1112 if (struct_value_rtx)
1113 size += GET_MODE_SIZE (Pmode);
1115 /* Restore each of the registers previously saved. Make USE insns
1116 for each of these registers for use in making the call. */
1117 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1118 if ((mode = apply_args_mode[regno]) != VOIDmode)
1120 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1121 if (size % align != 0)
1122 size = CEIL (size, align) * align;
1123 reg = gen_rtx_REG (mode, regno);
1124 emit_move_insn (reg, adjust_address (arguments, mode, size));
1125 use_reg (&call_fusage, reg);
1126 size += GET_MODE_SIZE (mode);
1129 /* Restore the structure value address unless this is passed as an
1130 "invisible" first argument. */
1131 size = GET_MODE_SIZE (Pmode);
1132 if (struct_value_rtx)
1134 rtx value = gen_reg_rtx (Pmode);
1135 emit_move_insn (value, adjust_address (arguments, Pmode, size));
1136 emit_move_insn (struct_value_rtx, value);
1137 if (GET_CODE (struct_value_rtx) == REG)
1138 use_reg (&call_fusage, struct_value_rtx);
1139 size += GET_MODE_SIZE (Pmode);
1142 /* All arguments and registers used for the call are set up by now! */
1143 function = prepare_call_address (function, NULL_TREE, &call_fusage, 0, 0);
1145 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
1146 and we don't want to load it into a register as an optimization,
1147 because prepare_call_address already did it if it should be done. */
1148 if (GET_CODE (function) != SYMBOL_REF)
1149 function = memory_address (FUNCTION_MODE, function);
1151 /* Generate the actual call instruction and save the return value. */
1152 #ifdef HAVE_untyped_call
1153 if (HAVE_untyped_call)
1154 emit_call_insn (gen_untyped_call (gen_rtx_MEM (FUNCTION_MODE, function),
1155 result, result_vector (1, result)));
1158 #ifdef HAVE_call_value
1159 if (HAVE_call_value)
1163 /* Locate the unique return register. It is not possible to
1164 express a call that sets more than one return register using
1165 call_value; use untyped_call for that. In fact, untyped_call
1166 only needs to save the return registers in the given block. */
1167 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1168 if ((mode = apply_result_mode[regno]) != VOIDmode)
1171 abort (); /* HAVE_untyped_call required. */
1172 valreg = gen_rtx_REG (mode, regno);
1175 emit_call_insn (GEN_CALL_VALUE (valreg,
1176 gen_rtx_MEM (FUNCTION_MODE, function),
1177 const0_rtx, NULL_RTX, const0_rtx));
1179 emit_move_insn (adjust_address (result, GET_MODE (valreg), 0), valreg);
1185 /* Find the CALL insn we just emitted. */
1186 for (call_insn = get_last_insn ();
1187 call_insn && GET_CODE (call_insn) != CALL_INSN;
1188 call_insn = PREV_INSN (call_insn))
1194 /* Put the register usage information on the CALL. If there is already
1195 some usage information, put ours at the end. */
1196 if (CALL_INSN_FUNCTION_USAGE (call_insn))
1200 for (link = CALL_INSN_FUNCTION_USAGE (call_insn); XEXP (link, 1) != 0;
1201 link = XEXP (link, 1))
1204 XEXP (link, 1) = call_fusage;
1207 CALL_INSN_FUNCTION_USAGE (call_insn) = call_fusage;
1209 /* Restore the stack. */
1210 #ifdef HAVE_save_stack_nonlocal
1211 if (HAVE_save_stack_nonlocal)
1212 emit_stack_restore (SAVE_NONLOCAL, old_stack_level, NULL_RTX);
1215 emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX);
1219 /* Return the address of the result block. */
1220 return copy_addr_to_reg (XEXP (result, 0));
1223 /* Perform an untyped return. */
1226 expand_builtin_return (result)
1229 int size, align, regno;
1230 enum machine_mode mode;
1232 rtx call_fusage = 0;
1234 apply_result_size ();
1235 result = gen_rtx_MEM (BLKmode, result);
1237 #ifdef HAVE_untyped_return
1238 if (HAVE_untyped_return)
1240 emit_jump_insn (gen_untyped_return (result, result_vector (0, result)));
1246 /* Restore the return value and note that each value is used. */
1248 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1249 if ((mode = apply_result_mode[regno]) != VOIDmode)
1251 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1252 if (size % align != 0)
1253 size = CEIL (size, align) * align;
1254 reg = gen_rtx_REG (mode, INCOMING_REGNO (regno));
1255 emit_move_insn (reg, adjust_address (result, mode, size));
1257 push_to_sequence (call_fusage);
1258 emit_insn (gen_rtx_USE (VOIDmode, reg));
1259 call_fusage = get_insns ();
1261 size += GET_MODE_SIZE (mode);
1264 /* Put the USE insns before the return. */
1265 emit_insns (call_fusage);
1267 /* Return whatever values was restored by jumping directly to the end
1269 expand_null_return ();
1272 /* Used by expand_builtin_classify_type and fold_builtin_classify_type. */
1273 static enum type_class
1274 type_to_class (type)
1277 switch (TREE_CODE (type))
1279 case VOID_TYPE: return void_type_class;
1280 case INTEGER_TYPE: return integer_type_class;
1281 case CHAR_TYPE: return char_type_class;
1282 case ENUMERAL_TYPE: return enumeral_type_class;
1283 case BOOLEAN_TYPE: return boolean_type_class;
1284 case POINTER_TYPE: return pointer_type_class;
1285 case REFERENCE_TYPE: return reference_type_class;
1286 case OFFSET_TYPE: return offset_type_class;
1287 case REAL_TYPE: return real_type_class;
1288 case COMPLEX_TYPE: return complex_type_class;
1289 case FUNCTION_TYPE: return function_type_class;
1290 case METHOD_TYPE: return method_type_class;
1291 case RECORD_TYPE: return record_type_class;
1293 case QUAL_UNION_TYPE: return union_type_class;
1294 case ARRAY_TYPE: return (TYPE_STRING_FLAG (type)
1295 ? string_type_class : array_type_class);
1296 case SET_TYPE: return set_type_class;
1297 case FILE_TYPE: return file_type_class;
1298 case LANG_TYPE: return lang_type_class;
1299 default: return no_type_class;
1303 /* Expand a call to __builtin_classify_type with arguments found in
1306 expand_builtin_classify_type (arglist)
1310 return GEN_INT (type_to_class (TREE_TYPE (TREE_VALUE (arglist))));
1311 return GEN_INT (no_type_class);
1314 /* Expand expression EXP, which is a call to __builtin_constant_p. */
1316 expand_builtin_constant_p (exp)
1319 tree arglist = TREE_OPERAND (exp, 1);
1320 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1325 arglist = TREE_VALUE (arglist);
1327 /* We have taken care of the easy cases during constant folding. This
1328 case is not obvious, so emit (constant_p_rtx (ARGLIST)) and let CSE get a
1329 chance to see if it can deduce whether ARGLIST is constant. */
1331 tmp = expand_expr (arglist, NULL_RTX, VOIDmode, 0);
1332 tmp = gen_rtx_CONSTANT_P_RTX (value_mode, tmp);
1336 /* Expand a call to one of the builtin math functions (sin, cos, or sqrt).
1337 Return 0 if a normal call should be emitted rather than expanding the
1338 function in-line. EXP is the expression that is a call to the builtin
1339 function; if convenient, the result should be placed in TARGET.
1340 SUBTARGET may be used as the target for computing one of EXP's operands. */
1342 expand_builtin_mathfn (exp, target, subtarget)
1344 rtx target, subtarget;
1346 optab builtin_optab;
1348 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
1349 tree arglist = TREE_OPERAND (exp, 1);
1351 if (!validate_arglist (arglist, REAL_TYPE, VOID_TYPE))
1354 /* Stabilize and compute the argument. */
1355 if (TREE_CODE (TREE_VALUE (arglist)) != VAR_DECL
1356 && TREE_CODE (TREE_VALUE (arglist)) != PARM_DECL)
1358 exp = copy_node (exp);
1359 TREE_OPERAND (exp, 1) = arglist;
1360 /* Wrap the computation of the argument in a SAVE_EXPR. That
1361 way, if we need to expand the argument again (as in the
1362 flag_errno_math case below where we cannot directly set
1363 errno), we will not perform side-effects more than once.
1364 Note that here we're mutating the original EXP as well as the
1365 copy; that's the right thing to do in case the original EXP
1366 is expanded later. */
1367 TREE_VALUE (arglist) = save_expr (TREE_VALUE (arglist));
1368 arglist = copy_node (arglist);
1370 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
1372 /* Make a suitable register to place result in. */
1373 target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));
1378 switch (DECL_FUNCTION_CODE (fndecl))
1383 builtin_optab = sin_optab; break;
1387 builtin_optab = cos_optab; break;
1388 case BUILT_IN_FSQRT:
1389 case BUILT_IN_SQRTF:
1390 case BUILT_IN_SQRTL:
1391 builtin_optab = sqrt_optab; break;
1396 /* Compute into TARGET.
1397 Set TARGET to wherever the result comes back. */
1398 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
1399 builtin_optab, op0, target, 0);
1401 /* If we were unable to expand via the builtin, stop the
1402 sequence (without outputting the insns) and return 0, causing
1403 a call to the library function. */
1410 /* If errno must be maintained and if we are not allowing unsafe
1411 math optimizations, check the result. */
1413 if (flag_errno_math && ! flag_unsafe_math_optimizations)
1417 /* Don't define the builtin FP instructions
1418 if your machine is not IEEE. */
1419 if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT)
1422 lab1 = gen_label_rtx ();
1424 /* Test the result; if it is NaN, set errno=EDOM because
1425 the argument was not in the domain. */
1426 emit_cmp_and_jump_insns (target, target, EQ, 0, GET_MODE (target),
1431 #ifdef GEN_ERRNO_RTX
1432 rtx errno_rtx = GEN_ERRNO_RTX;
1435 = gen_rtx_MEM (word_mode, gen_rtx_SYMBOL_REF (Pmode, "errno"));
1438 emit_move_insn (errno_rtx, GEN_INT (TARGET_EDOM));
1441 /* We can't set errno=EDOM directly; let the library call do it.
1442 Pop the arguments right away in case the call gets deleted. */
1444 expand_call (exp, target, 0);
1451 /* Output the entire sequence. */
1452 insns = get_insns ();
1459 /* Expand expression EXP which is a call to the strlen builtin. Return 0
1460 if we failed the caller should emit a normal call, otherwise
1461 try to get the result in TARGET, if convenient. */
1464 expand_builtin_strlen (exp, target)
1468 tree arglist = TREE_OPERAND (exp, 1);
1469 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1471 if (!validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
1476 tree src = TREE_VALUE (arglist);
1479 = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1481 rtx result, src_reg, char_rtx, before_strlen;
1482 enum machine_mode insn_mode = value_mode, char_mode;
1483 enum insn_code icode = CODE_FOR_nothing;
1485 /* If SRC is not a pointer type, don't do this operation inline. */
1489 /* Bail out if we can't compute strlen in the right mode. */
1490 while (insn_mode != VOIDmode)
1492 icode = strlen_optab->handlers[(int) insn_mode].insn_code;
1493 if (icode != CODE_FOR_nothing)
1496 insn_mode = GET_MODE_WIDER_MODE (insn_mode);
1498 if (insn_mode == VOIDmode)
1501 /* Make a place to write the result of the instruction. */
1504 && GET_CODE (result) == REG
1505 && GET_MODE (result) == insn_mode
1506 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
1507 result = gen_reg_rtx (insn_mode);
1509 /* Make a place to hold the source address. We will not expand
1510 the actual source until we are sure that the expansion will
1511 not fail -- there are trees that cannot be expanded twice. */
1512 src_reg = gen_reg_rtx (Pmode);
1514 /* Mark the beginning of the strlen sequence so we can emit the
1515 source operand later. */
1516 before_strlen = get_last_insn();
1518 /* Check the string is readable and has an end. */
1519 if (current_function_check_memory_usage)
1520 emit_library_call (chkr_check_str_libfunc, LCT_CONST_MAKE_BLOCK,
1521 VOIDmode, 2, src_reg, Pmode,
1522 GEN_INT (MEMORY_USE_RO),
1523 TYPE_MODE (integer_type_node));
1525 char_rtx = const0_rtx;
1526 char_mode = insn_data[(int) icode].operand[2].mode;
1527 if (! (*insn_data[(int) icode].operand[2].predicate) (char_rtx,
1529 char_rtx = copy_to_mode_reg (char_mode, char_rtx);
1531 pat = GEN_FCN (icode) (result, gen_rtx_MEM (BLKmode, src_reg),
1532 char_rtx, GEN_INT (align));
1537 /* Now that we are assured of success, expand the source. */
1539 pat = memory_address (BLKmode,
1540 expand_expr (src, src_reg, ptr_mode, EXPAND_SUM));
1542 emit_move_insn (src_reg, pat);
1543 pat = gen_sequence ();
1547 emit_insn_after (pat, before_strlen);
1549 emit_insn_before (pat, get_insns ());
1551 /* Return the value in the proper mode for this function. */
1552 if (GET_MODE (result) == value_mode)
1554 else if (target != 0)
1555 convert_move (target, result, 0);
1557 target = convert_to_mode (value_mode, result, 0);
1563 /* Expand a call to the strstr builtin. Return 0 if we failed the
1564 caller should emit a normal call, otherwise try to get the result
1565 in TARGET, if convenient (and in mode MODE if that's convenient). */
1568 expand_builtin_strstr (arglist, target, mode)
1571 enum machine_mode mode;
1573 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
1574 || current_function_check_memory_usage)
1578 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1580 const char *p1, *p2;
1589 const char *r = strstr (p1, p2);
1594 /* Return an offset into the constant string argument. */
1595 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1596 s1, ssize_int (r - p1))),
1597 target, mode, EXPAND_NORMAL);
1601 return expand_expr (s1, target, mode, EXPAND_NORMAL);
1606 fn = built_in_decls[BUILT_IN_STRCHR];
1610 /* New argument list transforming strstr(s1, s2) to
1611 strchr(s1, s2[0]). */
1613 build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
1614 arglist = tree_cons (NULL_TREE, s1, arglist);
1615 return expand_expr (build_function_call_expr (fn, arglist),
1616 target, mode, EXPAND_NORMAL);
1620 /* Expand a call to the strchr builtin. Return 0 if we failed the
1621 caller should emit a normal call, otherwise try to get the result
1622 in TARGET, if convenient (and in mode MODE if that's convenient). */
1625 expand_builtin_strchr (arglist, target, mode)
1628 enum machine_mode mode;
1630 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
1631 || current_function_check_memory_usage)
1635 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1638 if (TREE_CODE (s2) != INTEGER_CST)
1647 if (target_char_cast (s2, &c))
1655 /* Return an offset into the constant string argument. */
1656 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1657 s1, ssize_int (r - p1))),
1658 target, mode, EXPAND_NORMAL);
1661 /* FIXME: Should use here strchrM optab so that ports can optimize
1667 /* Expand a call to the strrchr builtin. Return 0 if we failed the
1668 caller should emit a normal call, otherwise try to get the result
1669 in TARGET, if convenient (and in mode MODE if that's convenient). */
1672 expand_builtin_strrchr (arglist, target, mode)
1675 enum machine_mode mode;
1677 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
1678 || current_function_check_memory_usage)
1682 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1686 if (TREE_CODE (s2) != INTEGER_CST)
1695 if (target_char_cast (s2, &c))
1698 r = strrchr (p1, c);
1703 /* Return an offset into the constant string argument. */
1704 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1705 s1, ssize_int (r - p1))),
1706 target, mode, EXPAND_NORMAL);
1709 if (! integer_zerop (s2))
1712 fn = built_in_decls[BUILT_IN_STRCHR];
1716 /* Transform strrchr(s1, '\0') to strchr(s1, '\0'). */
1717 return expand_expr (build_function_call_expr (fn, arglist),
1718 target, mode, EXPAND_NORMAL);
1722 /* Expand a call to the strpbrk builtin. Return 0 if we failed the
1723 caller should emit a normal call, otherwise try to get the result
1724 in TARGET, if convenient (and in mode MODE if that's convenient). */
1727 expand_builtin_strpbrk (arglist, target, mode)
1730 enum machine_mode mode;
1732 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
1733 || current_function_check_memory_usage)
1737 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1739 const char *p1, *p2;
1748 const char *r = strpbrk (p1, p2);
1753 /* Return an offset into the constant string argument. */
1754 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1755 s1, ssize_int (r - p1))),
1756 target, mode, EXPAND_NORMAL);
1761 /* strpbrk(x, "") == NULL.
1762 Evaluate and ignore the arguments in case they had
1764 expand_expr (s1, const0_rtx, VOIDmode, EXPAND_NORMAL);
1769 return 0; /* Really call strpbrk. */
1771 fn = built_in_decls[BUILT_IN_STRCHR];
1775 /* New argument list transforming strpbrk(s1, s2) to
1776 strchr(s1, s2[0]). */
1778 build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
1779 arglist = tree_cons (NULL_TREE, s1, arglist);
1780 return expand_expr (build_function_call_expr (fn, arglist),
1781 target, mode, EXPAND_NORMAL);
1785 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1786 bytes from constant string DATA + OFFSET and return it as target
1790 builtin_memcpy_read_str (data, offset, mode)
1792 HOST_WIDE_INT offset;
1793 enum machine_mode mode;
1795 const char *str = (const char *) data;
1797 if (offset + GET_MODE_SIZE (mode) > strlen (str) + 1)
1798 abort (); /* Attempt to read past the end of constant string. */
1800 return c_readstr (str + offset, mode);
1803 /* Expand a call to the memcpy builtin, with arguments in ARGLIST. */
1805 expand_builtin_memcpy (arglist)
1808 if (!validate_arglist (arglist,
1809 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
1813 tree dest = TREE_VALUE (arglist);
1814 tree src = TREE_VALUE (TREE_CHAIN (arglist));
1815 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1816 const char *src_str;
1818 int src_align = get_pointer_alignment (src, BIGGEST_ALIGNMENT);
1819 int dest_align = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
1820 rtx dest_mem, src_mem, dest_addr, len_rtx;
1822 /* If either SRC or DEST is not a pointer type, don't do
1823 this operation in-line. */
1824 if (src_align == 0 || dest_align == 0)
1827 dest_mem = get_memory_rtx (dest);
1828 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
1829 src_str = c_getstr (src);
1831 /* If SRC is a string constant and block move would be done
1832 by pieces, we can avoid loading the string from memory
1833 and only stored the computed constants. */
1835 && !current_function_check_memory_usage
1836 && GET_CODE (len_rtx) == CONST_INT
1837 && (unsigned HOST_WIDE_INT) INTVAL (len_rtx) <= strlen (src_str) + 1
1838 && can_store_by_pieces (INTVAL (len_rtx), builtin_memcpy_read_str,
1839 (PTR) src_str, dest_align))
1841 store_by_pieces (dest_mem, INTVAL (len_rtx),
1842 builtin_memcpy_read_str,
1843 (PTR) src_str, dest_align);
1844 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
1847 src_mem = get_memory_rtx (src);
1849 /* Just copy the rights of SRC to the rights of DEST. */
1850 if (current_function_check_memory_usage)
1851 emit_library_call (chkr_copy_bitmap_libfunc, LCT_CONST_MAKE_BLOCK,
1852 VOIDmode, 3, XEXP (dest_mem, 0), Pmode,
1853 XEXP (src_mem, 0), Pmode,
1854 len_rtx, TYPE_MODE (sizetype));
1856 /* Copy word part most expediently. */
1858 = emit_block_move (dest_mem, src_mem, len_rtx,
1859 MIN (src_align, dest_align));
1862 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
1868 /* Expand expression EXP, which is a call to the strcpy builtin. Return 0
1869 if we failed the caller should emit a normal call. */
1872 expand_builtin_strcpy (exp)
1875 tree arglist = TREE_OPERAND (exp, 1);
1878 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
1882 tree len = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
1887 len = size_binop (PLUS_EXPR, len, ssize_int (1));
1888 chainon (arglist, build_tree_list (NULL_TREE, len));
1891 result = expand_builtin_memcpy (arglist);
1894 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
1898 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1899 bytes from constant string DATA + OFFSET and return it as target
1903 builtin_strncpy_read_str (data, offset, mode)
1905 HOST_WIDE_INT offset;
1906 enum machine_mode mode;
1908 const char *str = (const char *) data;
1910 if ((unsigned HOST_WIDE_INT) offset > strlen (str))
1913 return c_readstr (str + offset, mode);
1916 /* Expand expression EXP, which is a call to the strncpy builtin. Return 0
1917 if we failed the caller should emit a normal call. */
1920 expand_builtin_strncpy (arglist, target, mode)
1923 enum machine_mode mode;
1925 if (!validate_arglist (arglist,
1926 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
1930 tree slen = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
1931 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1933 /* We must be passed a constant len parameter. */
1934 if (TREE_CODE (len) != INTEGER_CST)
1937 /* If the len parameter is zero, return the dst parameter. */
1938 if (compare_tree_int (len, 0) == 0)
1940 /* Evaluate and ignore the src argument in case it has
1942 expand_expr (TREE_VALUE (TREE_CHAIN (arglist)), const0_rtx,
1943 VOIDmode, EXPAND_NORMAL);
1944 /* Return the dst parameter. */
1945 return expand_expr (TREE_VALUE (arglist), target, mode,
1949 /* Now, we must be passed a constant src ptr parameter. */
1950 if (slen == 0 || TREE_CODE (slen) != INTEGER_CST)
1953 slen = size_binop (PLUS_EXPR, slen, ssize_int (1));
1955 /* We're required to pad with trailing zeros if the requested
1956 len is greater than strlen(s2)+1. In that case try to
1957 use store_by_pieces, if it fails, punt. */
1958 if (tree_int_cst_lt (slen, len))
1960 tree dest = TREE_VALUE (arglist);
1961 int dest_align = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
1962 const char *p = c_getstr (TREE_VALUE (TREE_CHAIN (arglist)));
1965 if (!p || !dest_align || TREE_INT_CST_HIGH (len)
1966 || !can_store_by_pieces (TREE_INT_CST_LOW (len),
1967 builtin_strncpy_read_str,
1968 (PTR) p, dest_align))
1971 dest_mem = get_memory_rtx (dest);
1972 store_by_pieces (dest_mem, TREE_INT_CST_LOW (len),
1973 builtin_strncpy_read_str,
1974 (PTR) p, dest_align);
1975 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
1978 /* OK transform into builtin memcpy. */
1979 return expand_builtin_memcpy (arglist);
1983 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1984 bytes from constant string DATA + OFFSET and return it as target
1988 builtin_memset_read_str (data, offset, mode)
1990 HOST_WIDE_INT offset ATTRIBUTE_UNUSED;
1991 enum machine_mode mode;
1993 const char *c = (const char *) data;
1994 char *p = alloca (GET_MODE_SIZE (mode));
1996 memset (p, *c, GET_MODE_SIZE (mode));
1998 return c_readstr (p, mode);
2001 /* Expand expression EXP, which is a call to the memset builtin. Return 0
2002 if we failed the caller should emit a normal call. */
2005 expand_builtin_memset (exp)
2008 tree arglist = TREE_OPERAND (exp, 1);
2010 if (!validate_arglist (arglist,
2011 POINTER_TYPE, INTEGER_TYPE, INTEGER_TYPE, VOID_TYPE))
2015 tree dest = TREE_VALUE (arglist);
2016 tree val = TREE_VALUE (TREE_CHAIN (arglist));
2017 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2020 int dest_align = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
2021 rtx dest_mem, dest_addr, len_rtx;
2023 /* If DEST is not a pointer type, don't do this
2024 operation in-line. */
2025 if (dest_align == 0)
2028 if (TREE_CODE (val) != INTEGER_CST)
2031 if (target_char_cast (val, &c))
2036 if (TREE_CODE (len) != INTEGER_CST || TREE_INT_CST_HIGH (len))
2038 if (current_function_check_memory_usage
2039 || !can_store_by_pieces (TREE_INT_CST_LOW (len),
2040 builtin_memset_read_str,
2041 (PTR) &c, dest_align))
2044 dest_mem = get_memory_rtx (dest);
2045 store_by_pieces (dest_mem, TREE_INT_CST_LOW (len),
2046 builtin_memset_read_str,
2047 (PTR) &c, dest_align);
2048 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
2051 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
2053 dest_mem = get_memory_rtx (dest);
2055 /* Just check DST is writable and mark it as readable. */
2056 if (current_function_check_memory_usage)
2057 emit_library_call (chkr_check_addr_libfunc, LCT_CONST_MAKE_BLOCK,
2058 VOIDmode, 3, XEXP (dest_mem, 0), Pmode,
2059 len_rtx, TYPE_MODE (sizetype),
2060 GEN_INT (MEMORY_USE_WO),
2061 TYPE_MODE (integer_type_node));
2064 dest_addr = clear_storage (dest_mem, len_rtx, dest_align);
2067 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
2073 /* Expand expression EXP, which is a call to the bzero builtin. Return 0
2074 if we failed the caller should emit a normal call. */
2076 expand_builtin_bzero (exp)
2079 tree arglist = TREE_OPERAND (exp, 1);
2080 tree dest, size, newarglist;
2083 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2086 dest = TREE_VALUE (arglist);
2087 size = TREE_VALUE (TREE_CHAIN (arglist));
2089 /* New argument list transforming bzero(ptr x, int y) to
2090 memset(ptr x, int 0, size_t y). */
2092 newarglist = build_tree_list (NULL_TREE, convert (sizetype, size));
2093 newarglist = tree_cons (NULL_TREE, integer_zero_node, newarglist);
2094 newarglist = tree_cons (NULL_TREE, dest, newarglist);
2096 TREE_OPERAND (exp, 1) = newarglist;
2097 result = expand_builtin_memset(exp);
2099 /* Always restore the original arguments. */
2100 TREE_OPERAND (exp, 1) = arglist;
2105 #ifdef HAVE_cmpstrsi
2106 /* Expand expression EXP, which is a call to the memcmp or the strcmp builtin.
2107 ARGLIST is the argument list for this call. Return 0 if we failed and the
2108 caller should emit a normal call, otherwise try to get the result in
2109 TARGET, if convenient. */
2111 expand_builtin_memcmp (exp, arglist, target)
2116 /* If we need to check memory accesses, call the library function. */
2117 if (current_function_check_memory_usage)
2120 if (!validate_arglist (arglist,
2121 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2125 enum machine_mode mode;
2126 tree arg1 = TREE_VALUE (arglist);
2127 tree arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2128 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2129 rtx arg1_rtx, arg2_rtx, arg3_rtx;
2134 = get_pointer_alignment (arg1, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
2136 = get_pointer_alignment (arg2, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
2137 enum machine_mode insn_mode
2138 = insn_data[(int) CODE_FOR_cmpstrsi].operand[0].mode;
2140 /* If we don't have POINTER_TYPE, call the function. */
2141 if (arg1_align == 0 || arg2_align == 0)
2144 /* Make a place to write the result of the instruction. */
2147 && GET_CODE (result) == REG && GET_MODE (result) == insn_mode
2148 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
2149 result = gen_reg_rtx (insn_mode);
2151 arg1_rtx = get_memory_rtx (arg1);
2152 arg2_rtx = get_memory_rtx (arg2);
2153 arg3_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
2157 insn = gen_cmpstrsi (result, arg1_rtx, arg2_rtx, arg3_rtx,
2158 GEN_INT (MIN (arg1_align, arg2_align)));
2163 emit_library_call_value (memcmp_libfunc, result, LCT_PURE_MAKE_BLOCK,
2164 TYPE_MODE (integer_type_node), 3,
2165 XEXP (arg1_rtx, 0), Pmode,
2166 XEXP (arg2_rtx, 0), Pmode,
2167 convert_to_mode (TYPE_MODE (sizetype), arg3_rtx,
2168 TREE_UNSIGNED (sizetype)),
2169 TYPE_MODE (sizetype));
2171 /* Return the value in the proper mode for this function. */
2172 mode = TYPE_MODE (TREE_TYPE (exp));
2173 if (GET_MODE (result) == mode)
2175 else if (target != 0)
2177 convert_move (target, result, 0);
2181 return convert_to_mode (mode, result, 0);
2186 /* Expand expression EXP, which is a call to the strcmp builtin. Return 0
2187 if we failed the caller should emit a normal call, otherwise try to get
2188 the result in TARGET, if convenient. */
2191 expand_builtin_strcmp (exp, target, mode)
2194 enum machine_mode mode;
2196 tree arglist = TREE_OPERAND (exp, 1);
2198 const char *p1, *p2;
2200 /* If we need to check memory accesses, call the library function. */
2201 if (current_function_check_memory_usage)
2204 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2207 arg1 = TREE_VALUE (arglist);
2208 arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2210 p1 = c_getstr (arg1);
2211 p2 = c_getstr (arg2);
2215 const int i = strcmp (p1, p2);
2216 return (i < 0 ? constm1_rtx : (i > 0 ? const1_rtx : const0_rtx));
2219 /* If either arg is "", return an expression corresponding to
2220 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
2221 if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
2223 tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
2224 tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
2226 fold (build1 (CONVERT_EXPR, integer_type_node,
2227 build1 (INDIRECT_REF, cst_uchar_node,
2228 build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
2230 fold (build1 (CONVERT_EXPR, integer_type_node,
2231 build1 (INDIRECT_REF, cst_uchar_node,
2232 build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
2233 tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
2234 return expand_expr (result, target, mode, EXPAND_NORMAL);
2237 #ifdef HAVE_cmpstrsi
2238 if (! HAVE_cmpstrsi)
2242 tree len = c_strlen (arg1);
2243 tree len2 = c_strlen (arg2);
2247 len = size_binop (PLUS_EXPR, ssize_int (1), len);
2250 len2 = size_binop (PLUS_EXPR, ssize_int (1), len2);
2252 /* If we don't have a constant length for the first, use the length
2253 of the second, if we know it. We don't require a constant for
2254 this case; some cost analysis could be done if both are available
2255 but neither is constant. For now, assume they're equally cheap
2256 unless one has side effects.
2258 If both strings have constant lengths, use the smaller. This
2259 could arise if optimization results in strcpy being called with
2260 two fixed strings, or if the code was machine-generated. We should
2261 add some code to the `memcmp' handler below to deal with such
2262 situations, someday. */
2264 if (!len || TREE_CODE (len) != INTEGER_CST)
2266 if (len2 && !TREE_SIDE_EFFECTS (len2))
2271 else if (len2 && TREE_CODE (len2) == INTEGER_CST
2272 && tree_int_cst_lt (len2, len))
2275 /* If both arguments have side effects, we cannot optimize. */
2276 if (TREE_SIDE_EFFECTS (len))
2279 chainon (arglist, build_tree_list (NULL_TREE, len));
2280 result = expand_builtin_memcmp (exp, arglist, target);
2282 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
2291 /* Expand expression EXP, which is a call to the strncmp builtin. Return 0
2292 if we failed the caller should emit a normal call, otherwise try to get
2293 the result in TARGET, if convenient. */
2295 expand_builtin_strncmp (exp, target, mode)
2298 enum machine_mode mode;
2300 tree arglist = TREE_OPERAND (exp, 1);
2301 tree arg1, arg2, arg3;
2302 const char *p1, *p2;
2304 /* If we need to check memory accesses, call the library function. */
2305 if (current_function_check_memory_usage)
2308 if (!validate_arglist (arglist,
2309 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2312 arg1 = TREE_VALUE (arglist);
2313 arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2314 arg3 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2316 /* If the len parameter is zero, return zero. */
2317 if (host_integerp (arg3, 1) && tree_low_cst (arg3, 1) == 0)
2319 /* Evaluate and ignore arg1 and arg2 in case they have
2321 expand_expr (arg1, const0_rtx, VOIDmode, EXPAND_NORMAL);
2322 expand_expr (arg2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2326 p1 = c_getstr (arg1);
2327 p2 = c_getstr (arg2);
2329 /* If all arguments are constant, evaluate at compile-time. */
2330 if (host_integerp (arg3, 1) && p1 && p2)
2332 const int r = strncmp (p1, p2, tree_low_cst (arg3, 1));
2333 return (r < 0 ? constm1_rtx : (r > 0 ? const1_rtx : const0_rtx));
2336 /* If len == 1 or (either string parameter is "" and (len >= 1)),
2337 return (*(const u_char*)arg1 - *(const u_char*)arg2). */
2338 if (host_integerp (arg3, 1)
2339 && (tree_low_cst (arg3, 1) == 1
2340 || (tree_low_cst (arg3, 1) > 1
2341 && ((p1 && *p1 == '\0') || (p2 && *p2 == '\0')))))
2343 tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
2344 tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
2346 fold (build1 (CONVERT_EXPR, integer_type_node,
2347 build1 (INDIRECT_REF, cst_uchar_node,
2348 build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
2350 fold (build1 (CONVERT_EXPR, integer_type_node,
2351 build1 (INDIRECT_REF, cst_uchar_node,
2352 build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
2353 tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
2354 return expand_expr (result, target, mode, EXPAND_NORMAL);
2357 #ifdef HAVE_cmpstrsi
2358 /* If c_strlen can determine an expression for one of the string
2359 lengths, and it doesn't have side effects, then call
2360 expand_builtin_memcmp() using length MIN(strlen(string)+1, arg3). */
2363 tree newarglist, len = 0;
2365 /* Perhaps one of the strings is really constant, if so prefer
2366 that constant length over the other string's length. */
2368 len = c_strlen (arg1);
2370 len = c_strlen (arg2);
2372 /* If we still don't have a len, try either string arg as long
2373 as they don't have side effects. */
2374 if (!len && !TREE_SIDE_EFFECTS (arg1))
2375 len = c_strlen (arg1);
2376 if (!len && !TREE_SIDE_EFFECTS (arg2))
2377 len = c_strlen (arg2);
2378 /* If we still don't have a length, punt. */
2382 /* Add one to the string length. */
2383 len = fold (size_binop (PLUS_EXPR, len, ssize_int (1)));
2385 /* The actual new length parameter is MIN(len,arg3). */
2386 len = fold (build (MIN_EXPR, TREE_TYPE (len), len, arg3));
2388 newarglist = build_tree_list (NULL_TREE, len);
2389 newarglist = tree_cons (NULL_TREE, arg2, newarglist);
2390 newarglist = tree_cons (NULL_TREE, arg1, newarglist);
2391 return expand_builtin_memcmp (exp, newarglist, target);
2398 /* Expand expression EXP, which is a call to the strcat builtin.
2399 Return 0 if we failed the caller should emit a normal call,
2400 otherwise try to get the result in TARGET, if convenient. */
2402 expand_builtin_strcat (arglist, target, mode)
2405 enum machine_mode mode;
2407 /* If we need to check memory accesses, call the library function. */
2408 if (current_function_check_memory_usage)
2411 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2415 tree dst = TREE_VALUE (arglist),
2416 src = TREE_VALUE (TREE_CHAIN (arglist));
2417 const char *p = c_getstr (src);
2419 /* If the string length is zero, return the dst parameter. */
2420 if (p && *p == '\0')
2421 return expand_expr (dst, target, mode, EXPAND_NORMAL);
2427 /* Expand expression EXP, which is a call to the strncat builtin.
2428 Return 0 if we failed the caller should emit a normal call,
2429 otherwise try to get the result in TARGET, if convenient. */
2431 expand_builtin_strncat (arglist, target, mode)
2434 enum machine_mode mode;
2436 /* If we need to check memory accesses, call the library function. */
2437 if (current_function_check_memory_usage)
2440 if (!validate_arglist (arglist,
2441 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2445 tree dst = TREE_VALUE (arglist),
2446 src = TREE_VALUE (TREE_CHAIN (arglist)),
2447 len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2448 const char *p = c_getstr (src);
2450 /* If the requested length is zero, or the src parameter string
2451 length is zero, return the dst parameter. */
2452 if ((TREE_CODE (len) == INTEGER_CST && compare_tree_int (len, 0) == 0)
2453 || (p && *p == '\0'))
2455 /* Evaluate and ignore the src and len parameters in case
2456 they have side-effects. */
2457 expand_expr (src, const0_rtx, VOIDmode, EXPAND_NORMAL);
2458 expand_expr (len, const0_rtx, VOIDmode, EXPAND_NORMAL);
2459 return expand_expr (dst, target, mode, EXPAND_NORMAL);
2462 /* If the requested len is greater than or equal to the string
2463 length, call strcat. */
2464 if (TREE_CODE (len) == INTEGER_CST && p
2465 && compare_tree_int (len, strlen (p)) >= 0)
2468 tree_cons (NULL_TREE, dst, build_tree_list (NULL_TREE, src)),
2469 fn = built_in_decls[BUILT_IN_STRCAT];
2471 /* If the replacement _DECL isn't initialized, don't do the
2476 return expand_expr (build_function_call_expr (fn, newarglist),
2477 target, mode, EXPAND_NORMAL);
2483 /* Expand expression EXP, which is a call to the strspn builtin.
2484 Return 0 if we failed the caller should emit a normal call,
2485 otherwise try to get the result in TARGET, if convenient. */
2487 expand_builtin_strspn (arglist, target, mode)
2490 enum machine_mode mode;
2492 /* If we need to check memory accesses, call the library function. */
2493 if (current_function_check_memory_usage)
2496 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2500 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
2501 const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
2503 /* If both arguments are constants, evaluate at compile-time. */
2506 const size_t r = strspn (p1, p2);
2507 return expand_expr (size_int (r), target, mode, EXPAND_NORMAL);
2510 /* If either argument is "", return 0. */
2511 if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
2513 /* Evaluate and ignore both arguments in case either one has
2515 expand_expr (s1, const0_rtx, VOIDmode, EXPAND_NORMAL);
2516 expand_expr (s2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2523 /* Expand expression EXP, which is a call to the strcspn builtin.
2524 Return 0 if we failed the caller should emit a normal call,
2525 otherwise try to get the result in TARGET, if convenient. */
2527 expand_builtin_strcspn (arglist, target, mode)
2530 enum machine_mode mode;
2532 /* If we need to check memory accesses, call the library function. */
2533 if (current_function_check_memory_usage)
2536 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2540 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
2541 const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
2543 /* If both arguments are constants, evaluate at compile-time. */
2546 const size_t r = strcspn (p1, p2);
2547 return expand_expr (size_int (r), target, mode, EXPAND_NORMAL);
2550 /* If the first argument is "", return 0. */
2551 if (p1 && *p1 == '\0')
2553 /* Evaluate and ignore argument s2 in case it has
2555 expand_expr (s2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2559 /* If the second argument is "", return __builtin_strlen(s1). */
2560 if (p2 && *p2 == '\0')
2562 tree newarglist = build_tree_list (NULL_TREE, s1),
2563 fn = built_in_decls[BUILT_IN_STRLEN];
2565 /* If the replacement _DECL isn't initialized, don't do the
2570 return expand_expr (build_function_call_expr (fn, newarglist),
2571 target, mode, EXPAND_NORMAL);
2577 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
2578 if that's convenient. */
2581 expand_builtin_saveregs ()
2585 /* Don't do __builtin_saveregs more than once in a function.
2586 Save the result of the first call and reuse it. */
2587 if (saveregs_value != 0)
2588 return saveregs_value;
2590 /* When this function is called, it means that registers must be
2591 saved on entry to this function. So we migrate the call to the
2592 first insn of this function. */
2596 #ifdef EXPAND_BUILTIN_SAVEREGS
2597 /* Do whatever the machine needs done in this case. */
2598 val = EXPAND_BUILTIN_SAVEREGS ();
2600 /* ??? We used to try and build up a call to the out of line function,
2601 guessing about what registers needed saving etc. This became much
2602 harder with __builtin_va_start, since we don't have a tree for a
2603 call to __builtin_saveregs to fall back on. There was exactly one
2604 port (i860) that used this code, and I'm unconvinced it could actually
2605 handle the general case. So we no longer try to handle anything
2606 weird and make the backend absorb the evil. */
2608 error ("__builtin_saveregs not supported by this target");
2615 saveregs_value = val;
2617 /* Put the sequence after the NOTE that starts the function. If this
2618 is inside a SEQUENCE, make the outer-level insn chain current, so
2619 the code is placed at the start of the function. */
2620 push_topmost_sequence ();
2621 emit_insns_after (seq, get_insns ());
2622 pop_topmost_sequence ();
2627 /* __builtin_args_info (N) returns word N of the arg space info
2628 for the current function. The number and meanings of words
2629 is controlled by the definition of CUMULATIVE_ARGS. */
2632 expand_builtin_args_info (exp)
2635 tree arglist = TREE_OPERAND (exp, 1);
2636 int nwords = sizeof (CUMULATIVE_ARGS) / sizeof (int);
2637 int *word_ptr = (int *) ¤t_function_args_info;
2639 /* These are used by the code below that is if 0'ed away */
2641 tree type, elts, result;
2644 if (sizeof (CUMULATIVE_ARGS) % sizeof (int) != 0)
2649 tree arg = TREE_VALUE (arglist);
2650 if (TREE_CODE (arg) != INTEGER_CST)
2651 error ("argument of `__builtin_args_info' must be constant");
2654 int wordnum = TREE_INT_CST_LOW (arg);
2656 if (wordnum < 0 || wordnum >= nwords || TREE_INT_CST_HIGH (arg))
2657 error ("argument of `__builtin_args_info' out of range");
2659 return GEN_INT (word_ptr[wordnum]);
2663 error ("missing argument in `__builtin_args_info'");
2668 for (i = 0; i < nwords; i++)
2669 elts = tree_cons (NULL_TREE, build_int_2 (word_ptr[i], 0));
2671 type = build_array_type (integer_type_node,
2672 build_index_type (build_int_2 (nwords, 0)));
2673 result = build (CONSTRUCTOR, type, NULL_TREE, nreverse (elts));
2674 TREE_CONSTANT (result) = 1;
2675 TREE_STATIC (result) = 1;
2676 result = build1 (INDIRECT_REF, build_pointer_type (type), result);
2677 TREE_CONSTANT (result) = 1;
2678 return expand_expr (result, NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD);
2682 /* Expand ARGLIST, from a call to __builtin_next_arg. */
2684 expand_builtin_next_arg (arglist)
2687 tree fntype = TREE_TYPE (current_function_decl);
2689 if ((TYPE_ARG_TYPES (fntype) == 0
2690 || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype)))
2692 && ! current_function_varargs)
2694 error ("`va_start' used in function with fixed args");
2700 tree last_parm = tree_last (DECL_ARGUMENTS (current_function_decl));
2701 tree arg = TREE_VALUE (arglist);
2703 /* Strip off all nops for the sake of the comparison. This
2704 is not quite the same as STRIP_NOPS. It does more.
2705 We must also strip off INDIRECT_EXPR for C++ reference
2707 while (TREE_CODE (arg) == NOP_EXPR
2708 || TREE_CODE (arg) == CONVERT_EXPR
2709 || TREE_CODE (arg) == NON_LVALUE_EXPR
2710 || TREE_CODE (arg) == INDIRECT_REF)
2711 arg = TREE_OPERAND (arg, 0);
2712 if (arg != last_parm)
2713 warning ("second parameter of `va_start' not last named argument");
2715 else if (! current_function_varargs)
2716 /* Evidently an out of date version of <stdarg.h>; can't validate
2717 va_start's second argument, but can still work as intended. */
2718 warning ("`__builtin_next_arg' called without an argument");
2720 return expand_binop (Pmode, add_optab,
2721 current_function_internal_arg_pointer,
2722 current_function_arg_offset_rtx,
2723 NULL_RTX, 0, OPTAB_LIB_WIDEN);
2726 /* Make it easier for the backends by protecting the valist argument
2727 from multiple evaluations. */
2730 stabilize_va_list (valist, needs_lvalue)
2734 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
2736 if (TREE_SIDE_EFFECTS (valist))
2737 valist = save_expr (valist);
2739 /* For this case, the backends will be expecting a pointer to
2740 TREE_TYPE (va_list_type_node), but it's possible we've
2741 actually been given an array (an actual va_list_type_node).
2743 if (TREE_CODE (TREE_TYPE (valist)) == ARRAY_TYPE)
2745 tree p1 = build_pointer_type (TREE_TYPE (va_list_type_node));
2746 tree p2 = build_pointer_type (va_list_type_node);
2748 valist = build1 (ADDR_EXPR, p2, valist);
2749 valist = fold (build1 (NOP_EXPR, p1, valist));
2758 if (! TREE_SIDE_EFFECTS (valist))
2761 pt = build_pointer_type (va_list_type_node);
2762 valist = fold (build1 (ADDR_EXPR, pt, valist));
2763 TREE_SIDE_EFFECTS (valist) = 1;
2766 if (TREE_SIDE_EFFECTS (valist))
2767 valist = save_expr (valist);
2768 valist = fold (build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (valist)),
2775 /* The "standard" implementation of va_start: just assign `nextarg' to
2778 std_expand_builtin_va_start (stdarg_p, valist, nextarg)
2787 /* The dummy named parameter is declared as a 'word' sized
2788 object, but if a 'word' is smaller than an 'int', it would
2789 have been promoted to int when it was added to the arglist. */
2790 int align = PARM_BOUNDARY / BITS_PER_UNIT;
2791 int size = MAX (UNITS_PER_WORD,
2792 GET_MODE_SIZE (TYPE_MODE (integer_type_node)));
2793 int offset = ((size + align - 1) / align) * align;
2794 nextarg = plus_constant (nextarg, -offset);
2797 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
2798 make_tree (ptr_type_node, nextarg));
2799 TREE_SIDE_EFFECTS (t) = 1;
2801 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2804 /* Expand ARGLIST, which from a call to __builtin_stdarg_va_start or
2805 __builtin_varargs_va_start, depending on STDARG_P. */
2807 expand_builtin_va_start (stdarg_p, arglist)
2812 tree chain = arglist, valist;
2815 nextarg = expand_builtin_next_arg (chain = TREE_CHAIN (arglist));
2817 nextarg = expand_builtin_next_arg (NULL_TREE);
2819 if (TREE_CHAIN (chain))
2820 error ("too many arguments to function `va_start'");
2822 valist = stabilize_va_list (TREE_VALUE (arglist), 1);
2824 #ifdef EXPAND_BUILTIN_VA_START
2825 EXPAND_BUILTIN_VA_START (stdarg_p, valist, nextarg);
2827 std_expand_builtin_va_start (stdarg_p, valist, nextarg);
2833 /* The "standard" implementation of va_arg: read the value from the
2834 current (padded) address and increment by the (padded) size. */
2837 std_expand_builtin_va_arg (valist, type)
2841 HOST_WIDE_INT align;
2842 HOST_WIDE_INT rounded_size;
2845 /* Compute the rounded size of the type. */
2846 align = PARM_BOUNDARY / BITS_PER_UNIT;
2847 rounded_size = (((int_size_in_bytes (type) + align - 1) / align) * align);
2851 if (PAD_VARARGS_DOWN)
2853 /* Small args are padded downward. */
2856 adj = TREE_INT_CST_LOW (TYPE_SIZE (type)) / BITS_PER_UNIT;
2857 if (rounded_size > align)
2860 addr_tree = build (PLUS_EXPR, TREE_TYPE (addr_tree), addr_tree,
2861 build_int_2 (rounded_size - adj, 0));
2864 addr = expand_expr (addr_tree, NULL_RTX, Pmode, EXPAND_NORMAL);
2865 addr = copy_to_reg (addr);
2867 /* Compute new value for AP. */
2868 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
2869 build (PLUS_EXPR, TREE_TYPE (valist), valist,
2870 build_int_2 (rounded_size, 0)));
2871 TREE_SIDE_EFFECTS (t) = 1;
2872 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2877 /* Expand __builtin_va_arg, which is not really a builtin function, but
2878 a very special sort of operator. */
2881 expand_builtin_va_arg (valist, type)
2885 tree promoted_type, want_va_type, have_va_type;
2887 /* Verify that valist is of the proper type. */
2889 want_va_type = va_list_type_node;
2890 have_va_type = TREE_TYPE (valist);
2891 if (TREE_CODE (want_va_type) == ARRAY_TYPE)
2893 /* If va_list is an array type, the argument may have decayed
2894 to a pointer type, e.g. by being passed to another function.
2895 In that case, unwrap both types so that we can compare the
2896 underlying records. */
2897 if (TREE_CODE (have_va_type) == ARRAY_TYPE
2898 || TREE_CODE (have_va_type) == POINTER_TYPE)
2900 want_va_type = TREE_TYPE (want_va_type);
2901 have_va_type = TREE_TYPE (have_va_type);
2904 if (TYPE_MAIN_VARIANT (want_va_type) != TYPE_MAIN_VARIANT (have_va_type))
2906 error ("first argument to `va_arg' not of type `va_list'");
2910 /* Generate a diagnostic for requesting data of a type that cannot
2911 be passed through `...' due to type promotion at the call site. */
2912 else if ((promoted_type = (*lang_type_promotes_to) (type)) != NULL_TREE)
2914 const char *name = "<anonymous type>", *pname = 0;
2915 static int gave_help;
2917 if (TYPE_NAME (type))
2919 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
2920 name = IDENTIFIER_POINTER (TYPE_NAME (type));
2921 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
2922 && DECL_NAME (TYPE_NAME (type)))
2923 name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
2925 if (TYPE_NAME (promoted_type))
2927 if (TREE_CODE (TYPE_NAME (promoted_type)) == IDENTIFIER_NODE)
2928 pname = IDENTIFIER_POINTER (TYPE_NAME (promoted_type));
2929 else if (TREE_CODE (TYPE_NAME (promoted_type)) == TYPE_DECL
2930 && DECL_NAME (TYPE_NAME (promoted_type)))
2931 pname = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (promoted_type)));
2934 error ("`%s' is promoted to `%s' when passed through `...'", name, pname);
2938 error ("(so you should pass `%s' not `%s' to `va_arg')", pname, name);
2945 /* Make it easier for the backends by protecting the valist argument
2946 from multiple evaluations. */
2947 valist = stabilize_va_list (valist, 0);
2949 #ifdef EXPAND_BUILTIN_VA_ARG
2950 addr = EXPAND_BUILTIN_VA_ARG (valist, type);
2952 addr = std_expand_builtin_va_arg (valist, type);
2956 result = gen_rtx_MEM (TYPE_MODE (type), addr);
2957 set_mem_alias_set (result, get_varargs_alias_set ());
2962 /* Expand ARGLIST, from a call to __builtin_va_end. */
2965 expand_builtin_va_end (arglist)
2968 tree valist = TREE_VALUE (arglist);
2970 #ifdef EXPAND_BUILTIN_VA_END
2971 valist = stabilize_va_list (valist, 0);
2972 EXPAND_BUILTIN_VA_END(arglist);
2974 /* Evaluate for side effects, if needed. I hate macros that don't
2976 if (TREE_SIDE_EFFECTS (valist))
2977 expand_expr (valist, const0_rtx, VOIDmode, EXPAND_NORMAL);
2983 /* Expand ARGLIST, from a call to __builtin_va_copy. We do this as a
2984 builtin rather than just as an assignment in stdarg.h because of the
2985 nastiness of array-type va_list types. */
2988 expand_builtin_va_copy (arglist)
2993 dst = TREE_VALUE (arglist);
2994 src = TREE_VALUE (TREE_CHAIN (arglist));
2996 dst = stabilize_va_list (dst, 1);
2997 src = stabilize_va_list (src, 0);
2999 if (TREE_CODE (va_list_type_node) != ARRAY_TYPE)
3001 t = build (MODIFY_EXPR, va_list_type_node, dst, src);
3002 TREE_SIDE_EFFECTS (t) = 1;
3003 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
3007 rtx dstb, srcb, size;
3009 /* Evaluate to pointers. */
3010 dstb = expand_expr (dst, NULL_RTX, Pmode, EXPAND_NORMAL);
3011 srcb = expand_expr (src, NULL_RTX, Pmode, EXPAND_NORMAL);
3012 size = expand_expr (TYPE_SIZE_UNIT (va_list_type_node), NULL_RTX,
3013 VOIDmode, EXPAND_NORMAL);
3015 /* "Dereference" to BLKmode memories. */
3016 dstb = gen_rtx_MEM (BLKmode, dstb);
3017 set_mem_alias_set (dstb, get_alias_set (TREE_TYPE (TREE_TYPE (dst))));
3018 srcb = gen_rtx_MEM (BLKmode, srcb);
3019 set_mem_alias_set (srcb, get_alias_set (TREE_TYPE (TREE_TYPE (src))));
3022 emit_block_move (dstb, srcb, size, TYPE_ALIGN (va_list_type_node));
3028 /* Expand a call to one of the builtin functions __builtin_frame_address or
3029 __builtin_return_address. */
3031 expand_builtin_frame_address (exp)
3034 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3035 tree arglist = TREE_OPERAND (exp, 1);
3037 /* The argument must be a nonnegative integer constant.
3038 It counts the number of frames to scan up the stack.
3039 The value is the return address saved in that frame. */
3041 /* Warning about missing arg was already issued. */
3043 else if (TREE_CODE (TREE_VALUE (arglist)) != INTEGER_CST
3044 || tree_int_cst_sgn (TREE_VALUE (arglist)) < 0)
3046 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3047 error ("invalid arg to `__builtin_frame_address'");
3049 error ("invalid arg to `__builtin_return_address'");
3054 rtx tem = expand_builtin_return_addr (DECL_FUNCTION_CODE (fndecl),
3055 TREE_INT_CST_LOW (TREE_VALUE (arglist)),
3056 hard_frame_pointer_rtx);
3058 /* Some ports cannot access arbitrary stack frames. */
3061 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3062 warning ("unsupported arg to `__builtin_frame_address'");
3064 warning ("unsupported arg to `__builtin_return_address'");
3068 /* For __builtin_frame_address, return what we've got. */
3069 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3072 if (GET_CODE (tem) != REG
3073 && ! CONSTANT_P (tem))
3074 tem = copy_to_mode_reg (Pmode, tem);
3079 /* Expand a call to the alloca builtin, with arguments ARGLIST. Return 0 if
3080 we failed and the caller should emit a normal call, otherwise try to get
3081 the result in TARGET, if convenient. */
3084 expand_builtin_alloca (arglist, target)
3091 if (!validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
3094 /* Compute the argument. */
3095 op0 = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
3097 /* Allocate the desired space. */
3098 result = allocate_dynamic_stack_space (op0, target, BITS_PER_UNIT);
3100 #ifdef POINTERS_EXTEND_UNSIGNED
3101 result = convert_memory_address (ptr_mode, result);
3107 /* Expand a call to the ffs builtin. The arguments are in ARGLIST.
3108 Return 0 if a normal call should be emitted rather than expanding the
3109 function in-line. If convenient, the result should be placed in TARGET.
3110 SUBTARGET may be used as the target for computing one of EXP's operands. */
3113 expand_builtin_ffs (arglist, target, subtarget)
3115 rtx target, subtarget;
3118 if (!validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
3121 /* Compute the argument. */
3122 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
3123 /* Compute ffs, into TARGET if possible.
3124 Set TARGET to wherever the result comes back. */
3125 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
3126 ffs_optab, op0, target, 1);
3132 /* If the string passed to fputs is a constant and is one character
3133 long, we attempt to transform this call into __builtin_fputc(). */
3136 expand_builtin_fputs (arglist, ignore)
3140 tree len, fn, fn_fputc = built_in_decls[BUILT_IN_FPUTC],
3141 fn_fwrite = built_in_decls[BUILT_IN_FWRITE];
3143 /* If the return value is used, or the replacement _DECL isn't
3144 initialized, don't do the transformation. */
3145 if (!ignore || !fn_fputc || !fn_fwrite)
3148 /* Verify the arguments in the original call. */
3149 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
3150 || current_function_check_memory_usage)
3153 /* Get the length of the string passed to fputs. If the length
3154 can't be determined, punt. */
3155 if (!(len = c_strlen (TREE_VALUE (arglist)))
3156 || TREE_CODE (len) != INTEGER_CST)
3159 switch (compare_tree_int (len, 1))
3161 case -1: /* length is 0, delete the call entirely . */
3163 /* Evaluate and ignore the argument in case it has
3165 expand_expr (TREE_VALUE (TREE_CHAIN (arglist)), const0_rtx,
3166 VOIDmode, EXPAND_NORMAL);
3169 case 0: /* length is 1, call fputc. */
3171 const char *p = c_getstr (TREE_VALUE (arglist));
3175 /* New argument list transforming fputs(string, stream) to
3176 fputc(string[0], stream). */
3178 build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)));
3180 tree_cons (NULL_TREE, build_int_2 (p[0], 0), arglist);
3186 case 1: /* length is greater than 1, call fwrite. */
3188 tree string_arg = TREE_VALUE (arglist);
3190 /* New argument list transforming fputs(string, stream) to
3191 fwrite(string, 1, len, stream). */
3192 arglist = build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)));
3193 arglist = tree_cons (NULL_TREE, len, arglist);
3194 arglist = tree_cons (NULL_TREE, size_one_node, arglist);
3195 arglist = tree_cons (NULL_TREE, string_arg, arglist);
3203 return expand_expr (build_function_call_expr (fn, arglist),
3204 (ignore ? const0_rtx : NULL_RTX),
3205 VOIDmode, EXPAND_NORMAL);
3208 /* Expand a call to __builtin_expect. We return our argument and emit a
3209 NOTE_INSN_EXPECTED_VALUE note. This is the expansion of __builtin_expect in
3210 a non-jump context. */
3213 expand_builtin_expect (arglist, target)
3220 if (arglist == NULL_TREE
3221 || TREE_CHAIN (arglist) == NULL_TREE)
3223 exp = TREE_VALUE (arglist);
3224 c = TREE_VALUE (TREE_CHAIN (arglist));
3226 if (TREE_CODE (c) != INTEGER_CST)
3228 error ("second arg to `__builtin_expect' must be a constant");
3229 c = integer_zero_node;
3232 target = expand_expr (exp, target, VOIDmode, EXPAND_NORMAL);
3234 /* Don't bother with expected value notes for integral constants. */
3235 if (GET_CODE (target) != CONST_INT)
3237 /* We do need to force this into a register so that we can be
3238 moderately sure to be able to correctly interpret the branch
3240 target = force_reg (GET_MODE (target), target);
3242 rtx_c = expand_expr (c, NULL_RTX, GET_MODE (target), EXPAND_NORMAL);
3244 note = emit_note (NULL, NOTE_INSN_EXPECTED_VALUE);
3245 NOTE_EXPECTED_VALUE (note) = gen_rtx_EQ (VOIDmode, target, rtx_c);
3251 /* Like expand_builtin_expect, except do this in a jump context. This is
3252 called from do_jump if the conditional is a __builtin_expect. Return either
3253 a SEQUENCE of insns to emit the jump or NULL if we cannot optimize
3254 __builtin_expect. We need to optimize this at jump time so that machines
3255 like the PowerPC don't turn the test into a SCC operation, and then jump
3256 based on the test being 0/1. */
3259 expand_builtin_expect_jump (exp, if_false_label, if_true_label)
3264 tree arglist = TREE_OPERAND (exp, 1);
3265 tree arg0 = TREE_VALUE (arglist);
3266 tree arg1 = TREE_VALUE (TREE_CHAIN (arglist));
3269 /* Only handle __builtin_expect (test, 0) and
3270 __builtin_expect (test, 1). */
3271 if (TREE_CODE (TREE_TYPE (arg1)) == INTEGER_TYPE
3272 && TREE_CODE (arg1) == INTEGER_CST
3273 && (TREE_INT_CST_LOW (arg1) == 0 || TREE_INT_CST_LOW (arg1) == 1)
3274 && TREE_INT_CST_HIGH (arg1) == 0)
3279 /* If we fail to locate an appropriate conditional jump, we'll
3280 fall back to normal evaluation. Ensure that the expression
3281 can be re-evaluated. */
3282 switch (unsafe_for_reeval (arg0))
3287 case 1: /* Mildly unsafe. */
3288 arg0 = unsave_expr (arg0);
3291 case 2: /* Wildly unsafe. */
3295 /* Expand the jump insns. */
3297 do_jump (arg0, if_false_label, if_true_label);
3298 ret = gen_sequence ();
3301 /* Now that the __builtin_expect has been validated, go through and add
3302 the expect's to each of the conditional jumps. If we run into an
3303 error, just give up and generate the 'safe' code of doing a SCC
3304 operation and then doing a branch on that. */
3305 for (j = 0; j < XVECLEN (ret, 0); j++)
3307 rtx insn = XVECEXP (ret, 0, j);
3310 if (GET_CODE (insn) == JUMP_INSN && any_condjump_p (insn)
3311 && (pattern = pc_set (insn)) != NULL_RTX)
3313 rtx ifelse = SET_SRC (pattern);
3317 if (GET_CODE (ifelse) != IF_THEN_ELSE)
3320 if (GET_CODE (XEXP (ifelse, 1)) == LABEL_REF)
3323 label = XEXP (XEXP (ifelse, 1), 0);
3325 /* An inverted jump reverses the probabilities. */
3326 else if (GET_CODE (XEXP (ifelse, 2)) == LABEL_REF)
3329 label = XEXP (XEXP (ifelse, 2), 0);
3331 /* We shouldn't have to worry about conditional returns during
3332 the expansion stage, but handle it gracefully anyway. */
3333 else if (GET_CODE (XEXP (ifelse, 1)) == RETURN)
3338 /* An inverted return reverses the probabilities. */
3339 else if (GET_CODE (XEXP (ifelse, 2)) == RETURN)
3347 /* If the test is expected to fail, reverse the
3349 if (TREE_INT_CST_LOW (arg1) == 0)
3352 /* If we are jumping to the false label, reverse the
3354 if (label == NULL_RTX)
3355 ; /* conditional return */
3356 else if (label == if_false_label)
3358 else if (label != if_true_label)
3362 predict_insn_def (insn, PRED_BUILTIN_EXPECT, taken);
3366 /* If no jumps were modified, fail and do __builtin_expect the normal
3376 /* Expand an expression EXP that calls a built-in function,
3377 with result going to TARGET if that's convenient
3378 (and in mode MODE if that's convenient).
3379 SUBTARGET may be used as the target for computing one of EXP's operands.
3380 IGNORE is nonzero if the value is to be ignored. */
3383 expand_builtin (exp, target, subtarget, mode, ignore)
3387 enum machine_mode mode;
3390 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3391 tree arglist = TREE_OPERAND (exp, 1);
3392 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
3394 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
3395 return (*targetm.expand_builtin) (exp, target, subtarget, mode, ignore);
3397 /* When not optimizing, generate calls to library functions for a certain
3399 if (! optimize && ! CALLED_AS_BUILT_IN (fndecl)
3400 && (fcode == BUILT_IN_SIN || fcode == BUILT_IN_COS
3401 || fcode == BUILT_IN_FSQRT || fcode == BUILT_IN_SQRTF
3402 || fcode == BUILT_IN_SQRTL || fcode == BUILT_IN_MEMSET
3403 || fcode == BUILT_IN_MEMCPY || fcode == BUILT_IN_MEMCMP
3404 || fcode == BUILT_IN_BCMP || fcode == BUILT_IN_BZERO
3405 || fcode == BUILT_IN_INDEX || fcode == BUILT_IN_RINDEX
3406 || fcode == BUILT_IN_STRCHR || fcode == BUILT_IN_STRRCHR
3407 || fcode == BUILT_IN_STRLEN || fcode == BUILT_IN_STRCPY
3408 || fcode == BUILT_IN_STRNCPY || fcode == BUILT_IN_STRNCMP
3409 || fcode == BUILT_IN_STRSTR || fcode == BUILT_IN_STRPBRK
3410 || fcode == BUILT_IN_STRCAT || fcode == BUILT_IN_STRNCAT
3411 || fcode == BUILT_IN_STRSPN || fcode == BUILT_IN_STRCSPN
3412 || fcode == BUILT_IN_STRCMP || fcode == BUILT_IN_FFS
3413 || fcode == BUILT_IN_PUTCHAR || fcode == BUILT_IN_PUTS
3414 || fcode == BUILT_IN_PRINTF || fcode == BUILT_IN_FPUTC
3415 || fcode == BUILT_IN_FPUTS || fcode == BUILT_IN_FWRITE))
3416 return expand_call (exp, target, ignore);
3422 case BUILT_IN_LLABS:
3423 case BUILT_IN_IMAXABS:
3425 case BUILT_IN_FABSF:
3426 case BUILT_IN_FABSL:
3427 /* build_function_call changes these into ABS_EXPR. */
3431 case BUILT_IN_CONJF:
3432 case BUILT_IN_CONJL:
3433 case BUILT_IN_CREAL:
3434 case BUILT_IN_CREALF:
3435 case BUILT_IN_CREALL:
3436 case BUILT_IN_CIMAG:
3437 case BUILT_IN_CIMAGF:
3438 case BUILT_IN_CIMAGL:
3439 /* expand_tree_builtin changes these into CONJ_EXPR, REALPART_EXPR
3440 and IMAGPART_EXPR. */
3449 /* Treat these like sqrt only if unsafe math optimizations are allowed,
3450 because of possible accuracy problems. */
3451 if (! flag_unsafe_math_optimizations)
3453 case BUILT_IN_FSQRT:
3454 case BUILT_IN_SQRTF:
3455 case BUILT_IN_SQRTL:
3456 target = expand_builtin_mathfn (exp, target, subtarget);
3464 case BUILT_IN_APPLY_ARGS:
3465 return expand_builtin_apply_args ();
3467 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
3468 FUNCTION with a copy of the parameters described by
3469 ARGUMENTS, and ARGSIZE. It returns a block of memory
3470 allocated on the stack into which is stored all the registers
3471 that might possibly be used for returning the result of a
3472 function. ARGUMENTS is the value returned by
3473 __builtin_apply_args. ARGSIZE is the number of bytes of
3474 arguments that must be copied. ??? How should this value be
3475 computed? We'll also need a safe worst case value for varargs
3477 case BUILT_IN_APPLY:
3478 if (!validate_arglist (arglist, POINTER_TYPE,
3479 POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
3480 && !validate_arglist (arglist, REFERENCE_TYPE,
3481 POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
3489 for (t = arglist, i = 0; t; t = TREE_CHAIN (t), i++)
3490 ops[i] = expand_expr (TREE_VALUE (t), NULL_RTX, VOIDmode, 0);
3492 return expand_builtin_apply (ops[0], ops[1], ops[2]);
3495 /* __builtin_return (RESULT) causes the function to return the
3496 value described by RESULT. RESULT is address of the block of
3497 memory returned by __builtin_apply. */
3498 case BUILT_IN_RETURN:
3499 if (validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
3500 expand_builtin_return (expand_expr (TREE_VALUE (arglist),
3501 NULL_RTX, VOIDmode, 0));
3504 case BUILT_IN_SAVEREGS:
3505 return expand_builtin_saveregs ();
3507 case BUILT_IN_ARGS_INFO:
3508 return expand_builtin_args_info (exp);
3510 /* Return the address of the first anonymous stack arg. */
3511 case BUILT_IN_NEXT_ARG:
3512 return expand_builtin_next_arg (arglist);
3514 case BUILT_IN_CLASSIFY_TYPE:
3515 return expand_builtin_classify_type (arglist);
3517 case BUILT_IN_CONSTANT_P:
3518 return expand_builtin_constant_p (exp);
3520 case BUILT_IN_FRAME_ADDRESS:
3521 case BUILT_IN_RETURN_ADDRESS:
3522 return expand_builtin_frame_address (exp);
3524 /* Returns the address of the area where the structure is returned.
3526 case BUILT_IN_AGGREGATE_INCOMING_ADDRESS:
3528 || ! AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl)))
3529 || GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl))) != MEM)
3532 return XEXP (DECL_RTL (DECL_RESULT (current_function_decl)), 0);
3534 case BUILT_IN_ALLOCA:
3535 target = expand_builtin_alloca (arglist, target);
3541 target = expand_builtin_ffs (arglist, target, subtarget);
3546 case BUILT_IN_STRLEN:
3547 target = expand_builtin_strlen (exp, target);
3552 case BUILT_IN_STRCPY:
3553 target = expand_builtin_strcpy (exp);
3558 case BUILT_IN_STRNCPY:
3559 target = expand_builtin_strncpy (arglist, target, mode);
3564 case BUILT_IN_STRCAT:
3565 target = expand_builtin_strcat (arglist, target, mode);
3570 case BUILT_IN_STRNCAT:
3571 target = expand_builtin_strncat (arglist, target, mode);
3576 case BUILT_IN_STRSPN:
3577 target = expand_builtin_strspn (arglist, target, mode);
3582 case BUILT_IN_STRCSPN:
3583 target = expand_builtin_strcspn (arglist, target, mode);
3588 case BUILT_IN_STRSTR:
3589 target = expand_builtin_strstr (arglist, target, mode);
3594 case BUILT_IN_STRPBRK:
3595 target = expand_builtin_strpbrk (arglist, target, mode);
3600 case BUILT_IN_INDEX:
3601 case BUILT_IN_STRCHR:
3602 target = expand_builtin_strchr (arglist, target, mode);
3607 case BUILT_IN_RINDEX:
3608 case BUILT_IN_STRRCHR:
3609 target = expand_builtin_strrchr (arglist, target, mode);
3614 case BUILT_IN_MEMCPY:
3615 target = expand_builtin_memcpy (arglist);
3620 case BUILT_IN_MEMSET:
3621 target = expand_builtin_memset (exp);
3626 case BUILT_IN_BZERO:
3627 target = expand_builtin_bzero (exp);
3632 case BUILT_IN_STRCMP:
3633 target = expand_builtin_strcmp (exp, target, mode);
3638 case BUILT_IN_STRNCMP:
3639 target = expand_builtin_strncmp (exp, target, mode);
3644 /* These comparison functions need an instruction that returns an actual
3645 index. An ordinary compare that just sets the condition codes
3647 #ifdef HAVE_cmpstrsi
3649 case BUILT_IN_MEMCMP:
3650 target = expand_builtin_memcmp (exp, arglist, target);
3656 case BUILT_IN_MEMCMP:
3660 case BUILT_IN_SETJMP:
3661 target = expand_builtin_setjmp (arglist, target);
3666 /* __builtin_longjmp is passed a pointer to an array of five words.
3667 It's similar to the C library longjmp function but works with
3668 __builtin_setjmp above. */
3669 case BUILT_IN_LONGJMP:
3670 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
3674 rtx buf_addr = expand_expr (TREE_VALUE (arglist), subtarget,
3676 rtx value = expand_expr (TREE_VALUE (TREE_CHAIN (arglist)),
3677 NULL_RTX, VOIDmode, 0);
3679 if (value != const1_rtx)
3681 error ("__builtin_longjmp second argument must be 1");
3685 expand_builtin_longjmp (buf_addr, value);
3692 emit_insn (gen_trap ());
3695 error ("__builtin_trap not supported by this target");
3699 case BUILT_IN_PUTCHAR:
3701 case BUILT_IN_FPUTC:
3702 case BUILT_IN_FWRITE:
3704 case BUILT_IN_FPUTS:
3705 target = expand_builtin_fputs (arglist, ignore);
3710 /* Various hooks for the DWARF 2 __throw routine. */
3711 case BUILT_IN_UNWIND_INIT:
3712 expand_builtin_unwind_init ();
3714 case BUILT_IN_DWARF_CFA:
3715 return virtual_cfa_rtx;
3716 #ifdef DWARF2_UNWIND_INFO
3717 case BUILT_IN_DWARF_FP_REGNUM:
3718 return expand_builtin_dwarf_fp_regnum ();
3719 case BUILT_IN_INIT_DWARF_REG_SIZES:
3720 expand_builtin_init_dwarf_reg_sizes (TREE_VALUE (arglist));
3723 case BUILT_IN_FROB_RETURN_ADDR:
3724 return expand_builtin_frob_return_addr (TREE_VALUE (arglist));
3725 case BUILT_IN_EXTRACT_RETURN_ADDR:
3726 return expand_builtin_extract_return_addr (TREE_VALUE (arglist));
3727 case BUILT_IN_EH_RETURN:
3728 expand_builtin_eh_return (TREE_VALUE (arglist),
3729 TREE_VALUE (TREE_CHAIN (arglist)));
3731 #ifdef EH_RETURN_DATA_REGNO
3732 case BUILT_IN_EH_RETURN_DATA_REGNO:
3733 return expand_builtin_eh_return_data_regno (arglist);
3735 case BUILT_IN_VARARGS_START:
3736 return expand_builtin_va_start (0, arglist);
3737 case BUILT_IN_STDARG_START:
3738 return expand_builtin_va_start (1, arglist);
3739 case BUILT_IN_VA_END:
3740 return expand_builtin_va_end (arglist);
3741 case BUILT_IN_VA_COPY:
3742 return expand_builtin_va_copy (arglist);
3743 case BUILT_IN_EXPECT:
3744 return expand_builtin_expect (arglist, target);
3746 default: /* just do library call, if unknown builtin */
3747 error ("built-in function `%s' not currently supported",
3748 IDENTIFIER_POINTER (DECL_NAME (fndecl)));
3751 /* The switch statement above can drop through to cause the function
3752 to be called normally. */
3753 return expand_call (exp, target, ignore);
3756 /* Fold a call to __builtin_constant_p, if we know it will evaluate to a
3757 constant. ARGLIST is the argument list of the call. */
3760 fold_builtin_constant_p (arglist)
3766 arglist = TREE_VALUE (arglist);
3768 /* We return 1 for a numeric type that's known to be a constant
3769 value at compile-time or for an aggregate type that's a
3770 literal constant. */
3771 STRIP_NOPS (arglist);
3773 /* If we know this is a constant, emit the constant of one. */
3774 if (TREE_CODE_CLASS (TREE_CODE (arglist)) == 'c'
3775 || (TREE_CODE (arglist) == CONSTRUCTOR
3776 && TREE_CONSTANT (arglist))
3777 || (TREE_CODE (arglist) == ADDR_EXPR
3778 && TREE_CODE (TREE_OPERAND (arglist, 0)) == STRING_CST))
3779 return integer_one_node;
3781 /* If we aren't going to be running CSE or this expression
3782 has side effects, show we don't know it to be a constant.
3783 Likewise if it's a pointer or aggregate type since in those
3784 case we only want literals, since those are only optimized
3785 when generating RTL, not later.
3786 And finally, if we are compiling an initializer, not code, we
3787 need to return a definite result now; there's not going to be any
3788 more optimization done. */
3789 if (TREE_SIDE_EFFECTS (arglist) || cse_not_expected
3790 || AGGREGATE_TYPE_P (TREE_TYPE (arglist))
3791 || POINTER_TYPE_P (TREE_TYPE (arglist))
3793 return integer_zero_node;
3798 /* Fold a call to __builtin_classify_type. */
3800 fold_builtin_classify_type (arglist)
3804 return build_int_2 (no_type_class, 0);
3806 return build_int_2 (type_to_class (TREE_TYPE (TREE_VALUE (arglist))), 0);
3809 /* Used by constant folding to eliminate some builtin calls early. EXP is
3810 the CALL_EXPR of a call to a builtin function. */
3816 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3817 tree arglist = TREE_OPERAND (exp, 1);
3818 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
3820 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
3825 case BUILT_IN_CONSTANT_P:
3826 return fold_builtin_constant_p (arglist);
3828 case BUILT_IN_CLASSIFY_TYPE:
3829 return fold_builtin_classify_type (arglist);
3831 case BUILT_IN_STRLEN:
3832 if (validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
3834 tree len = c_strlen (TREE_VALUE (arglist));
3848 build_function_call_expr (fn, arglist)
3853 call_expr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), fn);
3854 call_expr = build (CALL_EXPR, TREE_TYPE (TREE_TYPE (fn)),
3855 call_expr, arglist);
3856 TREE_SIDE_EFFECTS (call_expr) = 1;
3857 return fold (call_expr);
3860 /* This function validates the types of a function call argument list
3861 represented as a tree chain of parameters against a specified list
3862 of tree_codes. If the last specifier is a 0, that represents an
3863 ellipses, otherwise the last specifier must be a VOID_TYPE. */
3865 validate_arglist VPARAMS ((tree arglist, ...))
3867 #ifndef ANSI_PROTOTYPES
3870 enum tree_code code;
3873 VA_START (ap, arglist);
3875 #ifndef ANSI_PROTOTYPES
3876 arglist = va_arg (ap, tree);
3880 code = va_arg (ap, enum tree_code);
3884 /* This signifies an ellipses, any further arguments are all ok. */
3888 /* This signifies an endlink, if no arguments remain, return
3889 true, otherwise return false. */
3891 return arglist == 0;
3893 /* If no parameters remain or the parameter's code does not
3894 match the specified code, return false. Otherwise continue
3895 checking any remaining arguments. */
3896 if (arglist == 0 || code != TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))))
3903 arglist = TREE_CHAIN (arglist);
3907 /* Default version of target-specific builtin setup that does nothing. */
3910 default_init_builtins ()
3914 /* Default target-specific builtin expander that does nothing. */
3917 default_expand_builtin (exp, target, subtarget, mode, ignore)
3918 tree exp ATTRIBUTE_UNUSED;
3919 rtx target ATTRIBUTE_UNUSED;
3920 rtx subtarget ATTRIBUTE_UNUSED;
3921 enum machine_mode mode ATTRIBUTE_UNUSED;
3922 int ignore ATTRIBUTE_UNUSED;