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"
37 #include "typeclass.h"
42 #define CALLED_AS_BUILT_IN(NODE) \
43 (!strncmp (IDENTIFIER_POINTER (DECL_NAME (NODE)), "__builtin_", 10))
45 /* Register mappings for target machines without register windows. */
46 #ifndef INCOMING_REGNO
47 #define INCOMING_REGNO(OUT) (OUT)
49 #ifndef OUTGOING_REGNO
50 #define OUTGOING_REGNO(IN) (IN)
53 #ifndef PAD_VARARGS_DOWN
54 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
57 /* Define the names of the builtin function types and codes. */
58 const char *const built_in_class_names[4]
59 = {"NOT_BUILT_IN", "BUILT_IN_FRONTEND", "BUILT_IN_MD", "BUILT_IN_NORMAL"};
61 #define DEF_BUILTIN(X, N, C, T, LT, B, F, NA) STRINGX(X),
62 const char *const built_in_names[(int) END_BUILTINS] =
64 #include "builtins.def"
68 /* Setup an array of _DECL trees, make sure each element is
69 initialized to NULL_TREE. */
70 tree built_in_decls[(int) END_BUILTINS];
72 tree (*lang_type_promotes_to) PARAMS ((tree));
74 static int get_pointer_alignment PARAMS ((tree, unsigned));
75 static tree c_strlen PARAMS ((tree));
76 static const char *c_getstr PARAMS ((tree));
77 static rtx c_readstr PARAMS ((const char *,
79 static int target_char_cast PARAMS ((tree, char *));
80 static rtx get_memory_rtx PARAMS ((tree));
81 static int apply_args_size PARAMS ((void));
82 static int apply_result_size PARAMS ((void));
83 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
84 static rtx result_vector PARAMS ((int, rtx));
86 static rtx expand_builtin_setjmp PARAMS ((tree, rtx));
87 static rtx expand_builtin_apply_args PARAMS ((void));
88 static rtx expand_builtin_apply_args_1 PARAMS ((void));
89 static rtx expand_builtin_apply PARAMS ((rtx, rtx, rtx));
90 static void expand_builtin_return PARAMS ((rtx));
91 static rtx expand_builtin_classify_type PARAMS ((tree));
92 static rtx expand_builtin_mathfn PARAMS ((tree, rtx, rtx));
93 static rtx expand_builtin_constant_p PARAMS ((tree));
94 static rtx expand_builtin_args_info PARAMS ((tree));
95 static rtx expand_builtin_next_arg PARAMS ((tree));
96 static rtx expand_builtin_va_start PARAMS ((int, tree));
97 static rtx expand_builtin_va_end PARAMS ((tree));
98 static rtx expand_builtin_va_copy PARAMS ((tree));
100 static rtx expand_builtin_memcmp PARAMS ((tree, tree, rtx));
102 static rtx expand_builtin_strcmp PARAMS ((tree, rtx,
104 static rtx expand_builtin_strncmp PARAMS ((tree, rtx,
106 static rtx builtin_memcpy_read_str PARAMS ((PTR, HOST_WIDE_INT,
108 static rtx expand_builtin_strcat PARAMS ((tree, rtx,
110 static rtx expand_builtin_strncat PARAMS ((tree, rtx,
112 static rtx expand_builtin_strspn PARAMS ((tree, rtx,
114 static rtx expand_builtin_strcspn PARAMS ((tree, rtx,
116 static rtx expand_builtin_memcpy PARAMS ((tree));
117 static rtx expand_builtin_strcpy PARAMS ((tree));
118 static rtx builtin_strncpy_read_str PARAMS ((PTR, HOST_WIDE_INT,
120 static rtx expand_builtin_strncpy PARAMS ((tree, rtx,
122 static rtx builtin_memset_read_str PARAMS ((PTR, HOST_WIDE_INT,
124 static rtx expand_builtin_memset PARAMS ((tree));
125 static rtx expand_builtin_bzero PARAMS ((tree));
126 static rtx expand_builtin_strlen PARAMS ((tree, rtx));
127 static rtx expand_builtin_strstr PARAMS ((tree, rtx,
129 static rtx expand_builtin_strpbrk PARAMS ((tree, rtx,
131 static rtx expand_builtin_strchr PARAMS ((tree, rtx,
133 static rtx expand_builtin_strrchr PARAMS ((tree, rtx,
135 static rtx expand_builtin_alloca PARAMS ((tree, rtx));
136 static rtx expand_builtin_ffs PARAMS ((tree, rtx, rtx));
137 static rtx expand_builtin_frame_address PARAMS ((tree));
138 static rtx expand_builtin_fputs PARAMS ((tree, int));
139 static tree stabilize_va_list PARAMS ((tree, int));
140 static rtx expand_builtin_expect PARAMS ((tree, rtx));
141 static tree fold_builtin_constant_p PARAMS ((tree));
142 static tree build_function_call_expr PARAMS ((tree, tree));
143 static int validate_arglist PARAMS ((tree, ...));
145 /* Return the alignment in bits of EXP, a pointer valued expression.
146 But don't return more than MAX_ALIGN no matter what.
147 The alignment returned is, by default, the alignment of the thing that
148 EXP points to (if it is not a POINTER_TYPE, 0 is returned).
150 Otherwise, look at the expression to see if we can do better, i.e., if the
151 expression is actually pointing at an object whose alignment is tighter. */
154 get_pointer_alignment (exp, max_align)
158 unsigned align, inner;
160 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
163 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
164 align = MIN (align, max_align);
168 switch (TREE_CODE (exp))
172 case NON_LVALUE_EXPR:
173 exp = TREE_OPERAND (exp, 0);
174 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
177 inner = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
178 align = MIN (inner, max_align);
182 /* If sum of pointer + int, restrict our maximum alignment to that
183 imposed by the integer. If not, we can't do any better than
185 if (! host_integerp (TREE_OPERAND (exp, 1), 1))
188 while (((tree_low_cst (TREE_OPERAND (exp, 1), 1) * BITS_PER_UNIT)
193 exp = TREE_OPERAND (exp, 0);
197 /* See what we are pointing at and look at its alignment. */
198 exp = TREE_OPERAND (exp, 0);
199 if (TREE_CODE (exp) == FUNCTION_DECL)
200 align = FUNCTION_BOUNDARY;
201 else if (DECL_P (exp))
202 align = DECL_ALIGN (exp);
203 #ifdef CONSTANT_ALIGNMENT
204 else if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'c')
205 align = CONSTANT_ALIGNMENT (exp, align);
207 return MIN (align, max_align);
215 /* Compute the length of a C string. TREE_STRING_LENGTH is not the right
216 way, because it could contain a zero byte in the middle.
217 TREE_STRING_LENGTH is the size of the character array, not the string.
219 The value returned is of type `ssizetype'.
221 Unfortunately, string_constant can't access the values of const char
222 arrays with initializers, so neither can we do so here. */
232 src = string_constant (src, &offset_node);
236 max = TREE_STRING_LENGTH (src) - 1;
237 ptr = TREE_STRING_POINTER (src);
239 if (offset_node && TREE_CODE (offset_node) != INTEGER_CST)
241 /* If the string has an internal zero byte (e.g., "foo\0bar"), we can't
242 compute the offset to the following null if we don't know where to
243 start searching for it. */
246 for (i = 0; i < max; i++)
250 /* We don't know the starting offset, but we do know that the string
251 has no internal zero bytes. We can assume that the offset falls
252 within the bounds of the string; otherwise, the programmer deserves
253 what he gets. Subtract the offset from the length of the string,
254 and return that. This would perhaps not be valid if we were dealing
255 with named arrays in addition to literal string constants. */
257 return size_diffop (size_int (max), offset_node);
260 /* We have a known offset into the string. Start searching there for
262 if (offset_node == 0)
266 /* Did we get a long long offset? If so, punt. */
267 if (TREE_INT_CST_HIGH (offset_node) != 0)
269 offset = TREE_INT_CST_LOW (offset_node);
272 /* If the offset is known to be out of bounds, warn, and call strlen at
274 if (offset < 0 || offset > max)
276 warning ("offset outside bounds of constant string");
280 /* Use strlen to search for the first zero byte. Since any strings
281 constructed with build_string will have nulls appended, we win even
282 if we get handed something like (char[4])"abcd".
284 Since OFFSET is our starting index into the string, no further
285 calculation is needed. */
286 return ssize_int (strlen (ptr + offset));
289 /* Return a char pointer for a C string if it is a string constant
290 or sum of string constant and integer constant. */
300 src = string_constant (src, &offset_node);
304 max = TREE_STRING_LENGTH (src) - 1;
305 ptr = TREE_STRING_POINTER (src);
309 else if (TREE_CODE (offset_node) != INTEGER_CST)
313 /* Did we get a long long offset? If so, punt. */
314 if (TREE_INT_CST_HIGH (offset_node) != 0)
316 offset = TREE_INT_CST_LOW (offset_node);
317 if (offset < 0 || offset > max)
324 /* Return a CONST_INT or CONST_DOUBLE corresponding to target
325 reading GET_MODE_BITSIZE (MODE) bits from string constant
329 c_readstr (str, mode)
331 enum machine_mode mode;
337 if (GET_MODE_CLASS (mode) != MODE_INT)
342 for (i = 0; i < GET_MODE_SIZE (mode); i++)
345 if (WORDS_BIG_ENDIAN)
346 j = GET_MODE_SIZE (mode) - i - 1;
347 if (BYTES_BIG_ENDIAN != WORDS_BIG_ENDIAN
348 && GET_MODE_SIZE (mode) > UNITS_PER_WORD)
349 j = j + UNITS_PER_WORD - 2 * (j % UNITS_PER_WORD) - 1;
351 if (j > 2 * HOST_BITS_PER_WIDE_INT)
354 ch = (unsigned char) str[i];
355 c[j / HOST_BITS_PER_WIDE_INT] |= ch << (j % HOST_BITS_PER_WIDE_INT);
357 return immed_double_const (c[0], c[1], mode);
360 /* Cast a target constant CST to target CHAR and if that value fits into
361 host char type, return zero and put that value into variable pointed by
365 target_char_cast (cst, p)
369 unsigned HOST_WIDE_INT val, hostval;
371 if (TREE_CODE (cst) != INTEGER_CST
372 || CHAR_TYPE_SIZE > HOST_BITS_PER_WIDE_INT)
375 val = TREE_INT_CST_LOW (cst);
376 if (CHAR_TYPE_SIZE < HOST_BITS_PER_WIDE_INT)
377 val &= (((unsigned HOST_WIDE_INT) 1) << CHAR_TYPE_SIZE) - 1;
380 if (HOST_BITS_PER_CHAR < HOST_BITS_PER_WIDE_INT)
381 hostval &= (((unsigned HOST_WIDE_INT) 1) << HOST_BITS_PER_CHAR) - 1;
390 /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
391 times to get the address of either a higher stack frame, or a return
392 address located within it (depending on FNDECL_CODE). */
395 expand_builtin_return_addr (fndecl_code, count, tem)
396 enum built_in_function fndecl_code;
402 /* Some machines need special handling before we can access
403 arbitrary frames. For example, on the sparc, we must first flush
404 all register windows to the stack. */
405 #ifdef SETUP_FRAME_ADDRESSES
407 SETUP_FRAME_ADDRESSES ();
410 /* On the sparc, the return address is not in the frame, it is in a
411 register. There is no way to access it off of the current frame
412 pointer, but it can be accessed off the previous frame pointer by
413 reading the value from the register window save area. */
414 #ifdef RETURN_ADDR_IN_PREVIOUS_FRAME
415 if (fndecl_code == BUILT_IN_RETURN_ADDRESS)
419 /* Scan back COUNT frames to the specified frame. */
420 for (i = 0; i < count; i++)
422 /* Assume the dynamic chain pointer is in the word that the
423 frame address points to, unless otherwise specified. */
424 #ifdef DYNAMIC_CHAIN_ADDRESS
425 tem = DYNAMIC_CHAIN_ADDRESS (tem);
427 tem = memory_address (Pmode, tem);
428 tem = gen_rtx_MEM (Pmode, tem);
429 MEM_ALIAS_SET (tem) = get_frame_alias_set ();
430 tem = copy_to_reg (tem);
433 /* For __builtin_frame_address, return what we've got. */
434 if (fndecl_code == BUILT_IN_FRAME_ADDRESS)
437 /* For __builtin_return_address, Get the return address from that
439 #ifdef RETURN_ADDR_RTX
440 tem = RETURN_ADDR_RTX (count, tem);
442 tem = memory_address (Pmode,
443 plus_constant (tem, GET_MODE_SIZE (Pmode)));
444 tem = gen_rtx_MEM (Pmode, tem);
445 MEM_ALIAS_SET (tem) = get_frame_alias_set ();
450 /* Alias set used for setjmp buffer. */
451 static HOST_WIDE_INT setjmp_alias_set = -1;
453 /* Construct the leading half of a __builtin_setjmp call. Control will
454 return to RECEIVER_LABEL. This is used directly by sjlj exception
458 expand_builtin_setjmp_setup (buf_addr, receiver_label)
462 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
466 if (setjmp_alias_set == -1)
467 setjmp_alias_set = new_alias_set ();
469 #ifdef POINTERS_EXTEND_UNSIGNED
470 buf_addr = convert_memory_address (Pmode, buf_addr);
473 buf_addr = force_reg (Pmode, force_operand (buf_addr, NULL_RTX));
477 /* We store the frame pointer and the address of receiver_label in
478 the buffer and use the rest of it for the stack save area, which
479 is machine-dependent. */
481 #ifndef BUILTIN_SETJMP_FRAME_VALUE
482 #define BUILTIN_SETJMP_FRAME_VALUE virtual_stack_vars_rtx
485 mem = gen_rtx_MEM (Pmode, buf_addr);
486 MEM_ALIAS_SET (mem) = setjmp_alias_set;
487 emit_move_insn (mem, BUILTIN_SETJMP_FRAME_VALUE);
489 mem = gen_rtx_MEM (Pmode, plus_constant (buf_addr, GET_MODE_SIZE (Pmode))),
490 MEM_ALIAS_SET (mem) = setjmp_alias_set;
492 emit_move_insn (validize_mem (mem),
493 force_reg (Pmode, gen_rtx_LABEL_REF (Pmode, receiver_label)));
495 stack_save = gen_rtx_MEM (sa_mode,
496 plus_constant (buf_addr,
497 2 * GET_MODE_SIZE (Pmode)));
498 MEM_ALIAS_SET (stack_save) = setjmp_alias_set;
499 emit_stack_save (SAVE_NONLOCAL, &stack_save, NULL_RTX);
501 /* If there is further processing to do, do it. */
502 #ifdef HAVE_builtin_setjmp_setup
503 if (HAVE_builtin_setjmp_setup)
504 emit_insn (gen_builtin_setjmp_setup (buf_addr));
507 /* Tell optimize_save_area_alloca that extra work is going to
508 need to go on during alloca. */
509 current_function_calls_setjmp = 1;
511 /* Set this so all the registers get saved in our frame; we need to be
512 able to copy the saved values for any registers from frames we unwind. */
513 current_function_has_nonlocal_label = 1;
516 /* Construct the trailing part of a __builtin_setjmp call.
517 This is used directly by sjlj exception handling code. */
520 expand_builtin_setjmp_receiver (receiver_label)
521 rtx receiver_label ATTRIBUTE_UNUSED;
523 /* Clobber the FP when we get here, so we have to make sure it's
524 marked as used by this function. */
525 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
527 /* Mark the static chain as clobbered here so life information
528 doesn't get messed up for it. */
529 emit_insn (gen_rtx_CLOBBER (VOIDmode, static_chain_rtx));
531 /* Now put in the code to restore the frame pointer, and argument
532 pointer, if needed. The code below is from expand_end_bindings
533 in stmt.c; see detailed documentation there. */
534 #ifdef HAVE_nonlocal_goto
535 if (! HAVE_nonlocal_goto)
537 emit_move_insn (virtual_stack_vars_rtx, hard_frame_pointer_rtx);
539 #if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
540 if (fixed_regs[ARG_POINTER_REGNUM])
542 #ifdef ELIMINABLE_REGS
544 static struct elims {int from, to;} elim_regs[] = ELIMINABLE_REGS;
546 for (i = 0; i < ARRAY_SIZE (elim_regs); i++)
547 if (elim_regs[i].from == ARG_POINTER_REGNUM
548 && elim_regs[i].to == HARD_FRAME_POINTER_REGNUM)
551 if (i == ARRAY_SIZE (elim_regs))
554 /* Now restore our arg pointer from the address at which it
555 was saved in our stack frame.
556 If there hasn't be space allocated for it yet, make
558 if (arg_pointer_save_area == 0)
559 arg_pointer_save_area
560 = assign_stack_local (Pmode, GET_MODE_SIZE (Pmode), 0);
561 emit_move_insn (virtual_incoming_args_rtx,
562 copy_to_reg (arg_pointer_save_area));
567 #ifdef HAVE_builtin_setjmp_receiver
568 if (HAVE_builtin_setjmp_receiver)
569 emit_insn (gen_builtin_setjmp_receiver (receiver_label));
572 #ifdef HAVE_nonlocal_goto_receiver
573 if (HAVE_nonlocal_goto_receiver)
574 emit_insn (gen_nonlocal_goto_receiver ());
579 /* @@@ This is a kludge. Not all machine descriptions define a blockage
580 insn, but we must not allow the code we just generated to be reordered
581 by scheduling. Specifically, the update of the frame pointer must
582 happen immediately, not later. So emit an ASM_INPUT to act as blockage
584 emit_insn (gen_rtx_ASM_INPUT (VOIDmode, ""));
587 /* __builtin_setjmp is passed a pointer to an array of five words (not
588 all will be used on all machines). It operates similarly to the C
589 library function of the same name, but is more efficient. Much of
590 the code below (and for longjmp) is copied from the handling of
593 NOTE: This is intended for use by GNAT and the exception handling
594 scheme in the compiler and will only work in the method used by
598 expand_builtin_setjmp (arglist, target)
602 rtx buf_addr, next_lab, cont_lab;
604 if (!validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
607 if (target == 0 || GET_CODE (target) != REG
608 || REGNO (target) < FIRST_PSEUDO_REGISTER)
609 target = gen_reg_rtx (TYPE_MODE (integer_type_node));
611 buf_addr = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
613 next_lab = gen_label_rtx ();
614 cont_lab = gen_label_rtx ();
616 expand_builtin_setjmp_setup (buf_addr, next_lab);
618 /* Set TARGET to zero and branch to the continue label. */
619 emit_move_insn (target, const0_rtx);
620 emit_jump_insn (gen_jump (cont_lab));
622 emit_label (next_lab);
624 expand_builtin_setjmp_receiver (next_lab);
626 /* Set TARGET to one. */
627 emit_move_insn (target, const1_rtx);
628 emit_label (cont_lab);
630 /* Tell flow about the strange goings on. Putting `next_lab' on
631 `nonlocal_goto_handler_labels' to indicates that function
632 calls may traverse the arc back to this label. */
634 current_function_has_nonlocal_label = 1;
635 nonlocal_goto_handler_labels
636 = gen_rtx_EXPR_LIST (VOIDmode, next_lab, nonlocal_goto_handler_labels);
641 /* __builtin_longjmp is passed a pointer to an array of five words (not
642 all will be used on all machines). It operates similarly to the C
643 library function of the same name, but is more efficient. Much of
644 the code below is copied from the handling of non-local gotos.
646 NOTE: This is intended for use by GNAT and the exception handling
647 scheme in the compiler and will only work in the method used by
651 expand_builtin_longjmp (buf_addr, value)
654 rtx fp, lab, stack, insn;
655 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
657 if (setjmp_alias_set == -1)
658 setjmp_alias_set = new_alias_set ();
660 #ifdef POINTERS_EXTEND_UNSIGNED
661 buf_addr = convert_memory_address (Pmode, buf_addr);
663 buf_addr = force_reg (Pmode, buf_addr);
665 /* We used to store value in static_chain_rtx, but that fails if pointers
666 are smaller than integers. We instead require that the user must pass
667 a second argument of 1, because that is what builtin_setjmp will
668 return. This also makes EH slightly more efficient, since we are no
669 longer copying around a value that we don't care about. */
670 if (value != const1_rtx)
673 current_function_calls_longjmp = 1;
675 #ifdef HAVE_builtin_longjmp
676 if (HAVE_builtin_longjmp)
677 emit_insn (gen_builtin_longjmp (buf_addr));
681 fp = gen_rtx_MEM (Pmode, buf_addr);
682 lab = gen_rtx_MEM (Pmode, plus_constant (buf_addr,
683 GET_MODE_SIZE (Pmode)));
685 stack = gen_rtx_MEM (sa_mode, plus_constant (buf_addr,
686 2 * GET_MODE_SIZE (Pmode)));
687 MEM_ALIAS_SET (fp) = MEM_ALIAS_SET (lab) = MEM_ALIAS_SET (stack)
690 /* Pick up FP, label, and SP from the block and jump. This code is
691 from expand_goto in stmt.c; see there for detailed comments. */
692 #if HAVE_nonlocal_goto
693 if (HAVE_nonlocal_goto)
694 /* We have to pass a value to the nonlocal_goto pattern that will
695 get copied into the static_chain pointer, but it does not matter
696 what that value is, because builtin_setjmp does not use it. */
697 emit_insn (gen_nonlocal_goto (value, fp, stack, lab));
701 lab = copy_to_reg (lab);
703 emit_move_insn (hard_frame_pointer_rtx, fp);
704 emit_stack_restore (SAVE_NONLOCAL, stack, NULL_RTX);
706 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
707 emit_insn (gen_rtx_USE (VOIDmode, stack_pointer_rtx));
708 emit_indirect_jump (lab);
712 /* Search backwards and mark the jump insn as a non-local goto.
713 Note that this precludes the use of __builtin_longjmp to a
714 __builtin_setjmp target in the same function. However, we've
715 already cautioned the user that these functions are for
716 internal exception handling use only. */
717 for (insn = get_last_insn (); insn; insn = PREV_INSN (insn))
719 if (GET_CODE (insn) == JUMP_INSN)
721 REG_NOTES (insn) = alloc_EXPR_LIST (REG_NON_LOCAL_GOTO, const0_rtx,
725 else if (GET_CODE (insn) == CALL_INSN)
730 /* Get a MEM rtx for expression EXP which is the address of an operand
731 to be used to be used in a string instruction (cmpstrsi, movstrsi, ..). */
737 rtx mem = gen_rtx_MEM (BLKmode,
738 memory_address (BLKmode,
739 expand_expr (exp, NULL_RTX,
740 ptr_mode, EXPAND_SUM)));
742 /* Get an expression we can use to find the attributes to assign to MEM.
743 If it is an ADDR_EXPR, use the operand. Otherwise, dereference it if
744 we can. First remove any nops. */
745 while ((TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
746 || TREE_CODE (exp) == NON_LVALUE_EXPR)
747 && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (exp, 0))))
748 exp = TREE_OPERAND (exp, 0);
750 if (TREE_CODE (exp) == ADDR_EXPR)
751 exp = TREE_OPERAND (exp, 0);
752 else if (POINTER_TYPE_P (TREE_TYPE (exp)))
753 exp = build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (exp)), exp);
757 set_mem_attributes (mem, exp, 0);
759 /* memcpy, memset and other builtin stringops can alias with anything. */
760 MEM_ALIAS_SET (mem) = 0;
764 /* Built-in functions to perform an untyped call and return. */
766 /* For each register that may be used for calling a function, this
767 gives a mode used to copy the register's value. VOIDmode indicates
768 the register is not used for calling a function. If the machine
769 has register windows, this gives only the outbound registers.
770 INCOMING_REGNO gives the corresponding inbound register. */
771 static enum machine_mode apply_args_mode[FIRST_PSEUDO_REGISTER];
773 /* For each register that may be used for returning values, this gives
774 a mode used to copy the register's value. VOIDmode indicates the
775 register is not used for returning values. If the machine has
776 register windows, this gives only the outbound registers.
777 INCOMING_REGNO gives the corresponding inbound register. */
778 static enum machine_mode apply_result_mode[FIRST_PSEUDO_REGISTER];
780 /* For each register that may be used for calling a function, this
781 gives the offset of that register into the block returned by
782 __builtin_apply_args. 0 indicates that the register is not
783 used for calling a function. */
784 static int apply_args_reg_offset[FIRST_PSEUDO_REGISTER];
786 /* Return the offset of register REGNO into the block returned by
787 __builtin_apply_args. This is not declared static, since it is
788 needed in objc-act.c. */
791 apply_args_register_offset (regno)
796 /* Arguments are always put in outgoing registers (in the argument
797 block) if such make sense. */
798 #ifdef OUTGOING_REGNO
799 regno = OUTGOING_REGNO(regno);
801 return apply_args_reg_offset[regno];
804 /* Return the size required for the block returned by __builtin_apply_args,
805 and initialize apply_args_mode. */
810 static int size = -1;
812 enum machine_mode mode;
814 /* The values computed by this function never change. */
817 /* The first value is the incoming arg-pointer. */
818 size = GET_MODE_SIZE (Pmode);
820 /* The second value is the structure value address unless this is
821 passed as an "invisible" first argument. */
822 if (struct_value_rtx)
823 size += GET_MODE_SIZE (Pmode);
825 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
826 if (FUNCTION_ARG_REGNO_P (regno))
828 /* Search for the proper mode for copying this register's
829 value. I'm not sure this is right, but it works so far. */
830 enum machine_mode best_mode = VOIDmode;
832 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
834 mode = GET_MODE_WIDER_MODE (mode))
835 if (HARD_REGNO_MODE_OK (regno, mode)
836 && HARD_REGNO_NREGS (regno, mode) == 1)
839 if (best_mode == VOIDmode)
840 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
842 mode = GET_MODE_WIDER_MODE (mode))
843 if (HARD_REGNO_MODE_OK (regno, mode)
844 && (mov_optab->handlers[(int) mode].insn_code
845 != CODE_FOR_nothing))
849 if (mode == VOIDmode)
852 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
853 if (size % align != 0)
854 size = CEIL (size, align) * align;
855 apply_args_reg_offset[regno] = size;
856 size += GET_MODE_SIZE (mode);
857 apply_args_mode[regno] = mode;
861 apply_args_mode[regno] = VOIDmode;
862 apply_args_reg_offset[regno] = 0;
868 /* Return the size required for the block returned by __builtin_apply,
869 and initialize apply_result_mode. */
874 static int size = -1;
876 enum machine_mode mode;
878 /* The values computed by this function never change. */
883 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
884 if (FUNCTION_VALUE_REGNO_P (regno))
886 /* Search for the proper mode for copying this register's
887 value. I'm not sure this is right, but it works so far. */
888 enum machine_mode best_mode = VOIDmode;
890 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
892 mode = GET_MODE_WIDER_MODE (mode))
893 if (HARD_REGNO_MODE_OK (regno, mode))
896 if (best_mode == VOIDmode)
897 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
899 mode = GET_MODE_WIDER_MODE (mode))
900 if (HARD_REGNO_MODE_OK (regno, mode)
901 && (mov_optab->handlers[(int) mode].insn_code
902 != CODE_FOR_nothing))
906 if (mode == VOIDmode)
909 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
910 if (size % align != 0)
911 size = CEIL (size, align) * align;
912 size += GET_MODE_SIZE (mode);
913 apply_result_mode[regno] = mode;
916 apply_result_mode[regno] = VOIDmode;
918 /* Allow targets that use untyped_call and untyped_return to override
919 the size so that machine-specific information can be stored here. */
920 #ifdef APPLY_RESULT_SIZE
921 size = APPLY_RESULT_SIZE;
927 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
928 /* Create a vector describing the result block RESULT. If SAVEP is true,
929 the result block is used to save the values; otherwise it is used to
930 restore the values. */
933 result_vector (savep, result)
937 int regno, size, align, nelts;
938 enum machine_mode mode;
940 rtx *savevec = (rtx *) alloca (FIRST_PSEUDO_REGISTER * sizeof (rtx));
943 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
944 if ((mode = apply_result_mode[regno]) != VOIDmode)
946 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
947 if (size % align != 0)
948 size = CEIL (size, align) * align;
949 reg = gen_rtx_REG (mode, savep ? regno : INCOMING_REGNO (regno));
950 mem = adjust_address (result, mode, size);
951 savevec[nelts++] = (savep
952 ? gen_rtx_SET (VOIDmode, mem, reg)
953 : gen_rtx_SET (VOIDmode, reg, mem));
954 size += GET_MODE_SIZE (mode);
956 return gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (nelts, savevec));
958 #endif /* HAVE_untyped_call or HAVE_untyped_return */
960 /* Save the state required to perform an untyped call with the same
961 arguments as were passed to the current function. */
964 expand_builtin_apply_args_1 ()
967 int size, align, regno;
968 enum machine_mode mode;
970 /* Create a block where the arg-pointer, structure value address,
971 and argument registers can be saved. */
972 registers = assign_stack_local (BLKmode, apply_args_size (), -1);
974 /* Walk past the arg-pointer and structure value address. */
975 size = GET_MODE_SIZE (Pmode);
976 if (struct_value_rtx)
977 size += GET_MODE_SIZE (Pmode);
979 /* Save each register used in calling a function to the block. */
980 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
981 if ((mode = apply_args_mode[regno]) != VOIDmode)
985 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
986 if (size % align != 0)
987 size = CEIL (size, align) * align;
989 tem = gen_rtx_REG (mode, INCOMING_REGNO (regno));
991 emit_move_insn (adjust_address (registers, mode, size), tem);
992 size += GET_MODE_SIZE (mode);
995 /* Save the arg pointer to the block. */
996 emit_move_insn (adjust_address (registers, Pmode, 0),
997 copy_to_reg (virtual_incoming_args_rtx));
998 size = GET_MODE_SIZE (Pmode);
1000 /* Save the structure value address unless this is passed as an
1001 "invisible" first argument. */
1002 if (struct_value_incoming_rtx)
1004 emit_move_insn (adjust_address (registers, Pmode, size),
1005 copy_to_reg (struct_value_incoming_rtx));
1006 size += GET_MODE_SIZE (Pmode);
1009 /* Return the address of the block. */
1010 return copy_addr_to_reg (XEXP (registers, 0));
1013 /* __builtin_apply_args returns block of memory allocated on
1014 the stack into which is stored the arg pointer, structure
1015 value address, static chain, and all the registers that might
1016 possibly be used in performing a function call. The code is
1017 moved to the start of the function so the incoming values are
1020 expand_builtin_apply_args ()
1022 /* Don't do __builtin_apply_args more than once in a function.
1023 Save the result of the first call and reuse it. */
1024 if (apply_args_value != 0)
1025 return apply_args_value;
1027 /* When this function is called, it means that registers must be
1028 saved on entry to this function. So we migrate the
1029 call to the first insn of this function. */
1034 temp = expand_builtin_apply_args_1 ();
1038 apply_args_value = temp;
1040 /* Put the sequence after the NOTE that starts the function.
1041 If this is inside a SEQUENCE, make the outer-level insn
1042 chain current, so the code is placed at the start of the
1044 push_topmost_sequence ();
1045 emit_insns_before (seq, NEXT_INSN (get_insns ()));
1046 pop_topmost_sequence ();
1051 /* Perform an untyped call and save the state required to perform an
1052 untyped return of whatever value was returned by the given function. */
1055 expand_builtin_apply (function, arguments, argsize)
1056 rtx function, arguments, argsize;
1058 int size, align, regno;
1059 enum machine_mode mode;
1060 rtx incoming_args, result, reg, dest, call_insn;
1061 rtx old_stack_level = 0;
1062 rtx call_fusage = 0;
1064 /* Create a block where the return registers can be saved. */
1065 result = assign_stack_local (BLKmode, apply_result_size (), -1);
1067 /* Fetch the arg pointer from the ARGUMENTS block. */
1068 incoming_args = gen_reg_rtx (Pmode);
1069 emit_move_insn (incoming_args,
1070 gen_rtx_MEM (Pmode, arguments));
1071 #ifndef STACK_GROWS_DOWNWARD
1072 incoming_args = expand_binop (Pmode, sub_optab, incoming_args, argsize,
1073 incoming_args, 0, OPTAB_LIB_WIDEN);
1076 /* Perform postincrements before actually calling the function. */
1079 /* Push a new argument block and copy the arguments. Do not allow
1080 the (potential) memcpy call below to interfere with our stack
1082 do_pending_stack_adjust ();
1085 /* Save the stack with nonlocal if available */
1086 #ifdef HAVE_save_stack_nonlocal
1087 if (HAVE_save_stack_nonlocal)
1088 emit_stack_save (SAVE_NONLOCAL, &old_stack_level, NULL_RTX);
1091 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
1093 /* Push a block of memory onto the stack to store the memory arguments.
1094 Save the address in a register, and copy the memory arguments. ??? I
1095 haven't figured out how the calling convention macros effect this,
1096 but it's likely that the source and/or destination addresses in
1097 the block copy will need updating in machine specific ways. */
1098 dest = allocate_dynamic_stack_space (argsize, 0, BITS_PER_UNIT);
1099 emit_block_move (gen_rtx_MEM (BLKmode, dest),
1100 gen_rtx_MEM (BLKmode, incoming_args),
1101 argsize, PARM_BOUNDARY);
1103 /* Refer to the argument block. */
1105 arguments = gen_rtx_MEM (BLKmode, arguments);
1107 /* Walk past the arg-pointer and structure value address. */
1108 size = GET_MODE_SIZE (Pmode);
1109 if (struct_value_rtx)
1110 size += GET_MODE_SIZE (Pmode);
1112 /* Restore each of the registers previously saved. Make USE insns
1113 for each of these registers for use in making the call. */
1114 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1115 if ((mode = apply_args_mode[regno]) != VOIDmode)
1117 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1118 if (size % align != 0)
1119 size = CEIL (size, align) * align;
1120 reg = gen_rtx_REG (mode, regno);
1121 emit_move_insn (reg, adjust_address (arguments, mode, size));
1122 use_reg (&call_fusage, reg);
1123 size += GET_MODE_SIZE (mode);
1126 /* Restore the structure value address unless this is passed as an
1127 "invisible" first argument. */
1128 size = GET_MODE_SIZE (Pmode);
1129 if (struct_value_rtx)
1131 rtx value = gen_reg_rtx (Pmode);
1132 emit_move_insn (value, adjust_address (arguments, Pmode, size));
1133 emit_move_insn (struct_value_rtx, value);
1134 if (GET_CODE (struct_value_rtx) == REG)
1135 use_reg (&call_fusage, struct_value_rtx);
1136 size += GET_MODE_SIZE (Pmode);
1139 /* All arguments and registers used for the call are set up by now! */
1140 function = prepare_call_address (function, NULL_TREE, &call_fusage, 0);
1142 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
1143 and we don't want to load it into a register as an optimization,
1144 because prepare_call_address already did it if it should be done. */
1145 if (GET_CODE (function) != SYMBOL_REF)
1146 function = memory_address (FUNCTION_MODE, function);
1148 /* Generate the actual call instruction and save the return value. */
1149 #ifdef HAVE_untyped_call
1150 if (HAVE_untyped_call)
1151 emit_call_insn (gen_untyped_call (gen_rtx_MEM (FUNCTION_MODE, function),
1152 result, result_vector (1, result)));
1155 #ifdef HAVE_call_value
1156 if (HAVE_call_value)
1160 /* Locate the unique return register. It is not possible to
1161 express a call that sets more than one return register using
1162 call_value; use untyped_call for that. In fact, untyped_call
1163 only needs to save the return registers in the given block. */
1164 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1165 if ((mode = apply_result_mode[regno]) != VOIDmode)
1168 abort (); /* HAVE_untyped_call required. */
1169 valreg = gen_rtx_REG (mode, regno);
1172 emit_call_insn (GEN_CALL_VALUE (valreg,
1173 gen_rtx_MEM (FUNCTION_MODE, function),
1174 const0_rtx, NULL_RTX, const0_rtx));
1176 emit_move_insn (adjust_address (result, GET_MODE (valreg), 0), valreg);
1182 /* Find the CALL insn we just emitted. */
1183 for (call_insn = get_last_insn ();
1184 call_insn && GET_CODE (call_insn) != CALL_INSN;
1185 call_insn = PREV_INSN (call_insn))
1191 /* Put the register usage information on the CALL. If there is already
1192 some usage information, put ours at the end. */
1193 if (CALL_INSN_FUNCTION_USAGE (call_insn))
1197 for (link = CALL_INSN_FUNCTION_USAGE (call_insn); XEXP (link, 1) != 0;
1198 link = XEXP (link, 1))
1201 XEXP (link, 1) = call_fusage;
1204 CALL_INSN_FUNCTION_USAGE (call_insn) = call_fusage;
1206 /* Restore the stack. */
1207 #ifdef HAVE_save_stack_nonlocal
1208 if (HAVE_save_stack_nonlocal)
1209 emit_stack_restore (SAVE_NONLOCAL, old_stack_level, NULL_RTX);
1212 emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX);
1216 /* Return the address of the result block. */
1217 return copy_addr_to_reg (XEXP (result, 0));
1220 /* Perform an untyped return. */
1223 expand_builtin_return (result)
1226 int size, align, regno;
1227 enum machine_mode mode;
1229 rtx call_fusage = 0;
1231 apply_result_size ();
1232 result = gen_rtx_MEM (BLKmode, result);
1234 #ifdef HAVE_untyped_return
1235 if (HAVE_untyped_return)
1237 emit_jump_insn (gen_untyped_return (result, result_vector (0, result)));
1243 /* Restore the return value and note that each value is used. */
1245 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1246 if ((mode = apply_result_mode[regno]) != VOIDmode)
1248 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1249 if (size % align != 0)
1250 size = CEIL (size, align) * align;
1251 reg = gen_rtx_REG (mode, INCOMING_REGNO (regno));
1252 emit_move_insn (reg, adjust_address (result, mode, size));
1254 push_to_sequence (call_fusage);
1255 emit_insn (gen_rtx_USE (VOIDmode, reg));
1256 call_fusage = get_insns ();
1258 size += GET_MODE_SIZE (mode);
1261 /* Put the USE insns before the return. */
1262 emit_insns (call_fusage);
1264 /* Return whatever values was restored by jumping directly to the end
1266 expand_null_return ();
1269 /* Expand a call to __builtin_classify_type with arguments found in
1272 expand_builtin_classify_type (arglist)
1277 tree type = TREE_TYPE (TREE_VALUE (arglist));
1278 enum tree_code code = TREE_CODE (type);
1279 if (code == VOID_TYPE)
1280 return GEN_INT (void_type_class);
1281 if (code == INTEGER_TYPE)
1282 return GEN_INT (integer_type_class);
1283 if (code == CHAR_TYPE)
1284 return GEN_INT (char_type_class);
1285 if (code == ENUMERAL_TYPE)
1286 return GEN_INT (enumeral_type_class);
1287 if (code == BOOLEAN_TYPE)
1288 return GEN_INT (boolean_type_class);
1289 if (code == POINTER_TYPE)
1290 return GEN_INT (pointer_type_class);
1291 if (code == REFERENCE_TYPE)
1292 return GEN_INT (reference_type_class);
1293 if (code == OFFSET_TYPE)
1294 return GEN_INT (offset_type_class);
1295 if (code == REAL_TYPE)
1296 return GEN_INT (real_type_class);
1297 if (code == COMPLEX_TYPE)
1298 return GEN_INT (complex_type_class);
1299 if (code == FUNCTION_TYPE)
1300 return GEN_INT (function_type_class);
1301 if (code == METHOD_TYPE)
1302 return GEN_INT (method_type_class);
1303 if (code == RECORD_TYPE)
1304 return GEN_INT (record_type_class);
1305 if (code == UNION_TYPE || code == QUAL_UNION_TYPE)
1306 return GEN_INT (union_type_class);
1307 if (code == ARRAY_TYPE)
1309 if (TYPE_STRING_FLAG (type))
1310 return GEN_INT (string_type_class);
1312 return GEN_INT (array_type_class);
1314 if (code == SET_TYPE)
1315 return GEN_INT (set_type_class);
1316 if (code == FILE_TYPE)
1317 return GEN_INT (file_type_class);
1318 if (code == LANG_TYPE)
1319 return GEN_INT (lang_type_class);
1321 return GEN_INT (no_type_class);
1324 /* Expand expression EXP, which is a call to __builtin_constant_p. */
1326 expand_builtin_constant_p (exp)
1329 tree arglist = TREE_OPERAND (exp, 1);
1330 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1335 arglist = TREE_VALUE (arglist);
1337 /* We have taken care of the easy cases during constant folding. This
1338 case is not obvious, so emit (constant_p_rtx (ARGLIST)) and let CSE get a
1339 chance to see if it can deduce whether ARGLIST is constant. */
1341 tmp = expand_expr (arglist, NULL_RTX, VOIDmode, 0);
1342 tmp = gen_rtx_CONSTANT_P_RTX (value_mode, tmp);
1346 /* Expand a call to one of the builtin math functions (sin, cos, or sqrt).
1347 Return 0 if a normal call should be emitted rather than expanding the
1348 function in-line. EXP is the expression that is a call to the builtin
1349 function; if convenient, the result should be placed in TARGET.
1350 SUBTARGET may be used as the target for computing one of EXP's operands. */
1352 expand_builtin_mathfn (exp, target, subtarget)
1354 rtx target, subtarget;
1356 optab builtin_optab;
1358 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
1359 tree arglist = TREE_OPERAND (exp, 1);
1361 if (!validate_arglist (arglist, REAL_TYPE, VOID_TYPE))
1364 /* Stabilize and compute the argument. */
1365 if (TREE_CODE (TREE_VALUE (arglist)) != VAR_DECL
1366 && TREE_CODE (TREE_VALUE (arglist)) != PARM_DECL)
1368 exp = copy_node (exp);
1369 TREE_OPERAND (exp, 1) = arglist;
1370 /* Wrap the computation of the argument in a SAVE_EXPR. That
1371 way, if we need to expand the argument again (as in the
1372 flag_errno_math case below where we cannot directly set
1373 errno), we will not perform side-effects more than once.
1374 Note that here we're mutating the original EXP as well as the
1375 copy; that's the right thing to do in case the original EXP
1376 is expanded later. */
1377 TREE_VALUE (arglist) = save_expr (TREE_VALUE (arglist));
1378 arglist = copy_node (arglist);
1380 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
1382 /* Make a suitable register to place result in. */
1383 target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));
1388 switch (DECL_FUNCTION_CODE (fndecl))
1393 builtin_optab = sin_optab; break;
1397 builtin_optab = cos_optab; break;
1398 case BUILT_IN_FSQRT:
1399 case BUILT_IN_SQRTF:
1400 case BUILT_IN_SQRTL:
1401 builtin_optab = sqrt_optab; break;
1406 /* Compute into TARGET.
1407 Set TARGET to wherever the result comes back. */
1408 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
1409 builtin_optab, op0, target, 0);
1411 /* If we were unable to expand via the builtin, stop the
1412 sequence (without outputting the insns) and return 0, causing
1413 a call to the library function. */
1420 /* If errno must be maintained and if we are not allowing unsafe
1421 math optimizations, check the result. */
1423 if (flag_errno_math && ! flag_unsafe_math_optimizations)
1427 /* Don't define the builtin FP instructions
1428 if your machine is not IEEE. */
1429 if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT)
1432 lab1 = gen_label_rtx ();
1434 /* Test the result; if it is NaN, set errno=EDOM because
1435 the argument was not in the domain. */
1436 emit_cmp_and_jump_insns (target, target, EQ, 0, GET_MODE (target),
1441 #ifdef GEN_ERRNO_RTX
1442 rtx errno_rtx = GEN_ERRNO_RTX;
1445 = gen_rtx_MEM (word_mode, gen_rtx_SYMBOL_REF (Pmode, "errno"));
1448 emit_move_insn (errno_rtx, GEN_INT (TARGET_EDOM));
1451 /* We can't set errno=EDOM directly; let the library call do it.
1452 Pop the arguments right away in case the call gets deleted. */
1454 expand_call (exp, target, 0);
1461 /* Output the entire sequence. */
1462 insns = get_insns ();
1469 /* Expand expression EXP which is a call to the strlen builtin. Return 0
1470 if we failed the caller should emit a normal call, otherwise
1471 try to get the result in TARGET, if convenient. */
1474 expand_builtin_strlen (exp, target)
1478 tree arglist = TREE_OPERAND (exp, 1);
1479 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1481 if (!validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
1486 tree src = TREE_VALUE (arglist);
1489 = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1491 rtx result, src_reg, char_rtx, before_strlen;
1492 enum machine_mode insn_mode = value_mode, char_mode;
1493 enum insn_code icode = CODE_FOR_nothing;
1495 /* If SRC is not a pointer type, don't do this operation inline. */
1499 /* Bail out if we can't compute strlen in the right mode. */
1500 while (insn_mode != VOIDmode)
1502 icode = strlen_optab->handlers[(int) insn_mode].insn_code;
1503 if (icode != CODE_FOR_nothing)
1506 insn_mode = GET_MODE_WIDER_MODE (insn_mode);
1508 if (insn_mode == VOIDmode)
1511 /* Make a place to write the result of the instruction. */
1514 && GET_CODE (result) == REG
1515 && GET_MODE (result) == insn_mode
1516 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
1517 result = gen_reg_rtx (insn_mode);
1519 /* Make a place to hold the source address. We will not expand
1520 the actual source until we are sure that the expansion will
1521 not fail -- there are trees that cannot be expanded twice. */
1522 src_reg = gen_reg_rtx (Pmode);
1524 /* Mark the beginning of the strlen sequence so we can emit the
1525 source operand later. */
1526 before_strlen = get_last_insn();
1528 /* Check the string is readable and has an end. */
1529 if (current_function_check_memory_usage)
1530 emit_library_call (chkr_check_str_libfunc, LCT_CONST_MAKE_BLOCK,
1531 VOIDmode, 2, src_reg, Pmode,
1532 GEN_INT (MEMORY_USE_RO),
1533 TYPE_MODE (integer_type_node));
1535 char_rtx = const0_rtx;
1536 char_mode = insn_data[(int) icode].operand[2].mode;
1537 if (! (*insn_data[(int) icode].operand[2].predicate) (char_rtx,
1539 char_rtx = copy_to_mode_reg (char_mode, char_rtx);
1541 pat = GEN_FCN (icode) (result, gen_rtx_MEM (BLKmode, src_reg),
1542 char_rtx, GEN_INT (align));
1547 /* Now that we are assured of success, expand the source. */
1549 pat = memory_address (BLKmode,
1550 expand_expr (src, src_reg, ptr_mode, EXPAND_SUM));
1552 emit_move_insn (src_reg, pat);
1553 pat = gen_sequence ();
1557 emit_insn_after (pat, before_strlen);
1559 emit_insn_before (pat, get_insns ());
1561 /* Return the value in the proper mode for this function. */
1562 if (GET_MODE (result) == value_mode)
1564 else if (target != 0)
1565 convert_move (target, result, 0);
1567 target = convert_to_mode (value_mode, result, 0);
1573 /* Expand a call to the strstr builtin. Return 0 if we failed the
1574 caller should emit a normal call, otherwise try to get the result
1575 in TARGET, if convenient (and in mode MODE if that's convenient). */
1578 expand_builtin_strstr (arglist, target, mode)
1581 enum machine_mode mode;
1583 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
1584 || current_function_check_memory_usage)
1588 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1590 const char *p1, *p2;
1599 const char *r = strstr (p1, p2);
1604 /* Return an offset into the constant string argument. */
1605 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1606 s1, ssize_int (r - p1))),
1607 target, mode, EXPAND_NORMAL);
1611 return expand_expr (s1, target, mode, EXPAND_NORMAL);
1616 fn = built_in_decls[BUILT_IN_STRCHR];
1620 /* New argument list transforming strstr(s1, s2) to
1621 strchr(s1, s2[0]). */
1623 build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
1624 arglist = tree_cons (NULL_TREE, s1, arglist);
1625 return expand_expr (build_function_call_expr (fn, arglist),
1626 target, mode, EXPAND_NORMAL);
1630 /* Expand a call to the strchr builtin. Return 0 if we failed the
1631 caller should emit a normal call, otherwise try to get the result
1632 in TARGET, if convenient (and in mode MODE if that's convenient). */
1635 expand_builtin_strchr (arglist, target, mode)
1638 enum machine_mode mode;
1640 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
1641 || current_function_check_memory_usage)
1645 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1648 if (TREE_CODE (s2) != INTEGER_CST)
1657 if (target_char_cast (s2, &c))
1665 /* Return an offset into the constant string argument. */
1666 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1667 s1, ssize_int (r - p1))),
1668 target, mode, EXPAND_NORMAL);
1671 /* FIXME: Should use here strchrM optab so that ports can optimize
1677 /* Expand a call to the strrchr builtin. Return 0 if we failed the
1678 caller should emit a normal call, otherwise try to get the result
1679 in TARGET, if convenient (and in mode MODE if that's convenient). */
1682 expand_builtin_strrchr (arglist, target, mode)
1685 enum machine_mode mode;
1687 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
1688 || current_function_check_memory_usage)
1692 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1696 if (TREE_CODE (s2) != INTEGER_CST)
1705 if (target_char_cast (s2, &c))
1708 r = strrchr (p1, c);
1713 /* Return an offset into the constant string argument. */
1714 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1715 s1, ssize_int (r - p1))),
1716 target, mode, EXPAND_NORMAL);
1719 if (! integer_zerop (s2))
1722 fn = built_in_decls[BUILT_IN_STRCHR];
1726 /* Transform strrchr(s1, '\0') to strchr(s1, '\0'). */
1727 return expand_expr (build_function_call_expr (fn, arglist),
1728 target, mode, EXPAND_NORMAL);
1732 /* Expand a call to the strpbrk builtin. Return 0 if we failed the
1733 caller should emit a normal call, otherwise try to get the result
1734 in TARGET, if convenient (and in mode MODE if that's convenient). */
1737 expand_builtin_strpbrk (arglist, target, mode)
1740 enum machine_mode mode;
1742 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
1743 || current_function_check_memory_usage)
1747 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1749 const char *p1, *p2;
1758 const char *r = strpbrk (p1, p2);
1763 /* Return an offset into the constant string argument. */
1764 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1765 s1, ssize_int (r - p1))),
1766 target, mode, EXPAND_NORMAL);
1771 /* strpbrk(x, "") == NULL.
1772 Evaluate and ignore the arguments in case they had
1774 expand_expr (s1, const0_rtx, VOIDmode, EXPAND_NORMAL);
1779 return 0; /* Really call strpbrk. */
1781 fn = built_in_decls[BUILT_IN_STRCHR];
1785 /* New argument list transforming strpbrk(s1, s2) to
1786 strchr(s1, s2[0]). */
1788 build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
1789 arglist = tree_cons (NULL_TREE, s1, arglist);
1790 return expand_expr (build_function_call_expr (fn, arglist),
1791 target, mode, EXPAND_NORMAL);
1795 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1796 bytes from constant string DATA + OFFSET and return it as target
1800 builtin_memcpy_read_str (data, offset, mode)
1802 HOST_WIDE_INT offset;
1803 enum machine_mode mode;
1805 const char *str = (const char *) data;
1807 if (offset + GET_MODE_SIZE (mode) > strlen (str) + 1)
1808 abort (); /* Attempt to read past the end of constant string. */
1810 return c_readstr (str + offset, mode);
1813 /* Expand a call to the memcpy builtin, with arguments in ARGLIST. */
1815 expand_builtin_memcpy (arglist)
1818 if (!validate_arglist (arglist,
1819 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
1823 tree dest = TREE_VALUE (arglist);
1824 tree src = TREE_VALUE (TREE_CHAIN (arglist));
1825 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1826 const char *src_str;
1828 int src_align = get_pointer_alignment (src, BIGGEST_ALIGNMENT);
1829 int dest_align = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
1830 rtx dest_mem, src_mem, dest_addr, len_rtx;
1832 /* If either SRC or DEST is not a pointer type, don't do
1833 this operation in-line. */
1834 if (src_align == 0 || dest_align == 0)
1837 dest_mem = get_memory_rtx (dest);
1838 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
1839 src_str = c_getstr (src);
1841 /* If SRC is a string constant and block move would be done
1842 by pieces, we can avoid loading the string from memory
1843 and only stored the computed constants. */
1845 && !current_function_check_memory_usage
1846 && GET_CODE (len_rtx) == CONST_INT
1847 && (unsigned HOST_WIDE_INT) INTVAL (len_rtx) <= strlen (src_str) + 1
1848 && can_store_by_pieces (INTVAL (len_rtx), builtin_memcpy_read_str,
1849 (PTR) src_str, dest_align))
1851 store_by_pieces (dest_mem, INTVAL (len_rtx),
1852 builtin_memcpy_read_str,
1853 (PTR) src_str, dest_align);
1854 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
1857 src_mem = get_memory_rtx (src);
1859 /* Just copy the rights of SRC to the rights of DEST. */
1860 if (current_function_check_memory_usage)
1861 emit_library_call (chkr_copy_bitmap_libfunc, LCT_CONST_MAKE_BLOCK,
1862 VOIDmode, 3, XEXP (dest_mem, 0), Pmode,
1863 XEXP (src_mem, 0), Pmode,
1864 len_rtx, TYPE_MODE (sizetype));
1866 /* Copy word part most expediently. */
1868 = emit_block_move (dest_mem, src_mem, len_rtx,
1869 MIN (src_align, dest_align));
1872 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
1878 /* Expand expression EXP, which is a call to the strcpy builtin. Return 0
1879 if we failed the caller should emit a normal call. */
1882 expand_builtin_strcpy (exp)
1885 tree arglist = TREE_OPERAND (exp, 1);
1888 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
1892 tree len = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
1897 len = size_binop (PLUS_EXPR, len, ssize_int (1));
1898 chainon (arglist, build_tree_list (NULL_TREE, len));
1901 result = expand_builtin_memcpy (arglist);
1904 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
1908 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1909 bytes from constant string DATA + OFFSET and return it as target
1913 builtin_strncpy_read_str (data, offset, mode)
1915 HOST_WIDE_INT offset;
1916 enum machine_mode mode;
1918 const char *str = (const char *) data;
1920 if ((unsigned HOST_WIDE_INT) offset > strlen (str))
1923 return c_readstr (str + offset, mode);
1926 /* Expand expression EXP, which is a call to the strncpy builtin. Return 0
1927 if we failed the caller should emit a normal call. */
1930 expand_builtin_strncpy (arglist, target, mode)
1933 enum machine_mode mode;
1935 if (!validate_arglist (arglist,
1936 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
1940 tree slen = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
1941 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1943 /* We must be passed a constant len parameter. */
1944 if (TREE_CODE (len) != INTEGER_CST)
1947 /* If the len parameter is zero, return the dst parameter. */
1948 if (compare_tree_int (len, 0) == 0)
1950 /* Evaluate and ignore the src argument in case it has
1952 expand_expr (TREE_VALUE (TREE_CHAIN (arglist)), const0_rtx,
1953 VOIDmode, EXPAND_NORMAL);
1954 /* Return the dst parameter. */
1955 return expand_expr (TREE_VALUE (arglist), target, mode,
1959 /* Now, we must be passed a constant src ptr parameter. */
1960 if (slen == 0 || TREE_CODE (slen) != INTEGER_CST)
1963 slen = size_binop (PLUS_EXPR, slen, ssize_int (1));
1965 /* We're required to pad with trailing zeros if the requested
1966 len is greater than strlen(s2)+1. In that case try to
1967 use store_by_pieces, if it fails, punt. */
1968 if (tree_int_cst_lt (slen, len))
1970 tree dest = TREE_VALUE (arglist);
1971 int dest_align = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
1972 const char *p = c_getstr (TREE_VALUE (TREE_CHAIN (arglist)));
1975 if (!p || !dest_align || TREE_INT_CST_HIGH (len)
1976 || !can_store_by_pieces (TREE_INT_CST_LOW (len),
1977 builtin_strncpy_read_str,
1978 (PTR) p, dest_align))
1981 dest_mem = get_memory_rtx (dest);
1982 store_by_pieces (dest_mem, TREE_INT_CST_LOW (len),
1983 builtin_strncpy_read_str,
1984 (PTR) p, dest_align);
1985 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
1988 /* OK transform into builtin memcpy. */
1989 return expand_builtin_memcpy (arglist);
1993 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1994 bytes from constant string DATA + OFFSET and return it as target
1998 builtin_memset_read_str (data, offset, mode)
2000 HOST_WIDE_INT offset ATTRIBUTE_UNUSED;
2001 enum machine_mode mode;
2003 const char *c = (const char *) data;
2004 char *p = alloca (GET_MODE_SIZE (mode));
2006 memset (p, *c, GET_MODE_SIZE (mode));
2008 return c_readstr (p, mode);
2011 /* Expand expression EXP, which is a call to the memset builtin. Return 0
2012 if we failed the caller should emit a normal call. */
2015 expand_builtin_memset (exp)
2018 tree arglist = TREE_OPERAND (exp, 1);
2020 if (!validate_arglist (arglist,
2021 POINTER_TYPE, INTEGER_TYPE, INTEGER_TYPE, VOID_TYPE))
2025 tree dest = TREE_VALUE (arglist);
2026 tree val = TREE_VALUE (TREE_CHAIN (arglist));
2027 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2030 int dest_align = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
2031 rtx dest_mem, dest_addr, len_rtx;
2033 /* If DEST is not a pointer type, don't do this
2034 operation in-line. */
2035 if (dest_align == 0)
2038 if (TREE_CODE (val) != INTEGER_CST)
2041 if (target_char_cast (val, &c))
2046 if (TREE_CODE (len) != INTEGER_CST || TREE_INT_CST_HIGH (len))
2048 if (current_function_check_memory_usage
2049 || !can_store_by_pieces (TREE_INT_CST_LOW (len),
2050 builtin_memset_read_str,
2051 (PTR) &c, dest_align))
2054 dest_mem = get_memory_rtx (dest);
2055 store_by_pieces (dest_mem, TREE_INT_CST_LOW (len),
2056 builtin_memset_read_str,
2057 (PTR) &c, dest_align);
2058 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
2061 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
2063 dest_mem = get_memory_rtx (dest);
2065 /* Just check DST is writable and mark it as readable. */
2066 if (current_function_check_memory_usage)
2067 emit_library_call (chkr_check_addr_libfunc, LCT_CONST_MAKE_BLOCK,
2068 VOIDmode, 3, XEXP (dest_mem, 0), Pmode,
2069 len_rtx, TYPE_MODE (sizetype),
2070 GEN_INT (MEMORY_USE_WO),
2071 TYPE_MODE (integer_type_node));
2074 dest_addr = clear_storage (dest_mem, len_rtx, dest_align);
2077 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
2083 /* Expand expression EXP, which is a call to the bzero builtin. Return 0
2084 if we failed the caller should emit a normal call. */
2086 expand_builtin_bzero (exp)
2089 tree arglist = TREE_OPERAND (exp, 1);
2090 tree dest, size, newarglist;
2093 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2096 dest = TREE_VALUE (arglist);
2097 size = TREE_VALUE (TREE_CHAIN (arglist));
2099 /* New argument list transforming bzero(ptr x, int y) to
2100 memset(ptr x, int 0, size_t y). */
2102 newarglist = build_tree_list (NULL_TREE, convert (sizetype, size));
2103 newarglist = tree_cons (NULL_TREE, integer_zero_node, newarglist);
2104 newarglist = tree_cons (NULL_TREE, dest, newarglist);
2106 TREE_OPERAND (exp, 1) = newarglist;
2107 result = expand_builtin_memset(exp);
2109 /* Always restore the original arguments. */
2110 TREE_OPERAND (exp, 1) = arglist;
2115 #ifdef HAVE_cmpstrsi
2116 /* Expand expression EXP, which is a call to the memcmp or the strcmp builtin.
2117 ARGLIST is the argument list for this call. Return 0 if we failed and the
2118 caller should emit a normal call, otherwise try to get the result in
2119 TARGET, if convenient. */
2121 expand_builtin_memcmp (exp, arglist, target)
2126 /* If we need to check memory accesses, call the library function. */
2127 if (current_function_check_memory_usage)
2130 if (!validate_arglist (arglist,
2131 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2135 enum machine_mode mode;
2136 tree arg1 = TREE_VALUE (arglist);
2137 tree arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2138 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2139 rtx arg1_rtx, arg2_rtx, arg3_rtx;
2144 = get_pointer_alignment (arg1, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
2146 = get_pointer_alignment (arg2, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
2147 enum machine_mode insn_mode
2148 = insn_data[(int) CODE_FOR_cmpstrsi].operand[0].mode;
2150 /* If we don't have POINTER_TYPE, call the function. */
2151 if (arg1_align == 0 || arg2_align == 0)
2154 /* Make a place to write the result of the instruction. */
2157 && GET_CODE (result) == REG && GET_MODE (result) == insn_mode
2158 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
2159 result = gen_reg_rtx (insn_mode);
2161 arg1_rtx = get_memory_rtx (arg1);
2162 arg2_rtx = get_memory_rtx (arg2);
2163 arg3_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
2167 insn = gen_cmpstrsi (result, arg1_rtx, arg2_rtx, arg3_rtx,
2168 GEN_INT (MIN (arg1_align, arg2_align)));
2173 emit_library_call_value (memcmp_libfunc, result, LCT_PURE_MAKE_BLOCK,
2174 TYPE_MODE (integer_type_node), 3,
2175 XEXP (arg1_rtx, 0), Pmode,
2176 XEXP (arg2_rtx, 0), Pmode,
2177 convert_to_mode (TYPE_MODE (sizetype), arg3_rtx,
2178 TREE_UNSIGNED (sizetype)),
2179 TYPE_MODE (sizetype));
2181 /* Return the value in the proper mode for this function. */
2182 mode = TYPE_MODE (TREE_TYPE (exp));
2183 if (GET_MODE (result) == mode)
2185 else if (target != 0)
2187 convert_move (target, result, 0);
2191 return convert_to_mode (mode, result, 0);
2196 /* Expand expression EXP, which is a call to the strcmp builtin. Return 0
2197 if we failed the caller should emit a normal call, otherwise try to get
2198 the result in TARGET, if convenient. */
2201 expand_builtin_strcmp (exp, target, mode)
2204 enum machine_mode mode;
2206 tree arglist = TREE_OPERAND (exp, 1);
2208 const char *p1, *p2;
2210 /* If we need to check memory accesses, call the library function. */
2211 if (current_function_check_memory_usage)
2214 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2217 arg1 = TREE_VALUE (arglist);
2218 arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2220 p1 = c_getstr (arg1);
2221 p2 = c_getstr (arg2);
2225 const int i = strcmp (p1, p2);
2226 return (i < 0 ? constm1_rtx : (i > 0 ? const1_rtx : const0_rtx));
2229 /* If either arg is "", return an expression corresponding to
2230 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
2231 if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
2233 tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
2234 tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
2236 fold (build1 (CONVERT_EXPR, integer_type_node,
2237 build1 (INDIRECT_REF, cst_uchar_node,
2238 build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
2240 fold (build1 (CONVERT_EXPR, integer_type_node,
2241 build1 (INDIRECT_REF, cst_uchar_node,
2242 build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
2243 tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
2244 return expand_expr (result, target, mode, EXPAND_NORMAL);
2247 #ifdef HAVE_cmpstrsi
2248 if (! HAVE_cmpstrsi)
2252 tree len = c_strlen (arg1);
2253 tree len2 = c_strlen (arg2);
2257 len = size_binop (PLUS_EXPR, ssize_int (1), len);
2260 len2 = size_binop (PLUS_EXPR, ssize_int (1), len2);
2262 /* If we don't have a constant length for the first, use the length
2263 of the second, if we know it. We don't require a constant for
2264 this case; some cost analysis could be done if both are available
2265 but neither is constant. For now, assume they're equally cheap
2266 unless one has side effects.
2268 If both strings have constant lengths, use the smaller. This
2269 could arise if optimization results in strcpy being called with
2270 two fixed strings, or if the code was machine-generated. We should
2271 add some code to the `memcmp' handler below to deal with such
2272 situations, someday. */
2274 if (!len || TREE_CODE (len) != INTEGER_CST)
2276 if (len2 && !TREE_SIDE_EFFECTS (len2))
2281 else if (len2 && TREE_CODE (len2) == INTEGER_CST
2282 && tree_int_cst_lt (len2, len))
2285 /* If both arguments have side effects, we cannot optimize. */
2286 if (TREE_SIDE_EFFECTS (len))
2289 chainon (arglist, build_tree_list (NULL_TREE, len));
2290 result = expand_builtin_memcmp (exp, arglist, target);
2292 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
2301 /* Expand expression EXP, which is a call to the strncmp builtin. Return 0
2302 if we failed the caller should emit a normal call, otherwise try to get
2303 the result in TARGET, if convenient. */
2305 expand_builtin_strncmp (exp, target, mode)
2308 enum machine_mode mode;
2310 tree arglist = TREE_OPERAND (exp, 1);
2311 tree arg1, arg2, arg3;
2312 const char *p1, *p2;
2314 /* If we need to check memory accesses, call the library function. */
2315 if (current_function_check_memory_usage)
2318 if (!validate_arglist (arglist,
2319 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2322 arg1 = TREE_VALUE (arglist);
2323 arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2324 arg3 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2326 /* If the len parameter is zero, return zero. */
2327 if (host_integerp (arg3, 1) && tree_low_cst (arg3, 1) == 0)
2329 /* Evaluate and ignore arg1 and arg2 in case they have
2331 expand_expr (arg1, const0_rtx, VOIDmode, EXPAND_NORMAL);
2332 expand_expr (arg2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2336 p1 = c_getstr (arg1);
2337 p2 = c_getstr (arg2);
2339 /* If all arguments are constant, evaluate at compile-time. */
2340 if (host_integerp (arg3, 1) && p1 && p2)
2342 const int r = strncmp (p1, p2, tree_low_cst (arg3, 1));
2343 return (r < 0 ? constm1_rtx : (r > 0 ? const1_rtx : const0_rtx));
2346 /* If len == 1 or (either string parameter is "" and (len >= 1)),
2347 return (*(const u_char*)arg1 - *(const u_char*)arg2). */
2348 if (host_integerp (arg3, 1)
2349 && (tree_low_cst (arg3, 1) == 1
2350 || (tree_low_cst (arg3, 1) > 1
2351 && ((p1 && *p1 == '\0') || (p2 && *p2 == '\0')))))
2353 tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
2354 tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
2356 fold (build1 (CONVERT_EXPR, integer_type_node,
2357 build1 (INDIRECT_REF, cst_uchar_node,
2358 build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
2360 fold (build1 (CONVERT_EXPR, integer_type_node,
2361 build1 (INDIRECT_REF, cst_uchar_node,
2362 build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
2363 tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
2364 return expand_expr (result, target, mode, EXPAND_NORMAL);
2367 #ifdef HAVE_cmpstrsi
2368 /* If c_strlen can determine an expression for one of the string
2369 lengths, and it doesn't have side effects, then call
2370 expand_builtin_memcmp() using length MIN(strlen(string)+1, arg3). */
2373 tree newarglist, len = 0;
2375 /* Perhaps one of the strings is really constant, if so prefer
2376 that constant length over the other string's length. */
2378 len = c_strlen (arg1);
2380 len = c_strlen (arg2);
2382 /* If we still don't have a len, try either string arg as long
2383 as they don't have side effects. */
2384 if (!len && !TREE_SIDE_EFFECTS (arg1))
2385 len = c_strlen (arg1);
2386 if (!len && !TREE_SIDE_EFFECTS (arg2))
2387 len = c_strlen (arg2);
2388 /* If we still don't have a length, punt. */
2392 /* Add one to the string length. */
2393 len = fold (size_binop (PLUS_EXPR, len, ssize_int (1)));
2395 /* The actual new length parameter is MIN(len,arg3). */
2396 len = fold (build (MIN_EXPR, TREE_TYPE (len), len, arg3));
2398 newarglist = build_tree_list (NULL_TREE, len);
2399 newarglist = tree_cons (NULL_TREE, arg2, newarglist);
2400 newarglist = tree_cons (NULL_TREE, arg1, newarglist);
2401 return expand_builtin_memcmp (exp, newarglist, target);
2408 /* Expand expression EXP, which is a call to the strcat builtin.
2409 Return 0 if we failed the caller should emit a normal call,
2410 otherwise try to get the result in TARGET, if convenient. */
2412 expand_builtin_strcat (arglist, target, mode)
2415 enum machine_mode mode;
2417 /* If we need to check memory accesses, call the library function. */
2418 if (current_function_check_memory_usage)
2421 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2425 tree dst = TREE_VALUE (arglist),
2426 src = TREE_VALUE (TREE_CHAIN (arglist));
2427 const char *p = c_getstr (src);
2429 /* If the string length is zero, return the dst parameter. */
2430 if (p && *p == '\0')
2431 return expand_expr (dst, target, mode, EXPAND_NORMAL);
2437 /* Expand expression EXP, which is a call to the strncat builtin.
2438 Return 0 if we failed the caller should emit a normal call,
2439 otherwise try to get the result in TARGET, if convenient. */
2441 expand_builtin_strncat (arglist, target, mode)
2444 enum machine_mode mode;
2446 /* If we need to check memory accesses, call the library function. */
2447 if (current_function_check_memory_usage)
2450 if (!validate_arglist (arglist,
2451 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2455 tree dst = TREE_VALUE (arglist),
2456 src = TREE_VALUE (TREE_CHAIN (arglist)),
2457 len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2458 const char *p = c_getstr (src);
2460 /* If the requested length is zero, or the src parameter string
2461 length is zero, return the dst parameter. */
2462 if ((TREE_CODE (len) == INTEGER_CST && compare_tree_int (len, 0) == 0)
2463 || (p && *p == '\0'))
2465 /* Evaluate and ignore the src and len parameters in case
2466 they have side-effects. */
2467 expand_expr (src, const0_rtx, VOIDmode, EXPAND_NORMAL);
2468 expand_expr (len, const0_rtx, VOIDmode, EXPAND_NORMAL);
2469 return expand_expr (dst, target, mode, EXPAND_NORMAL);
2472 /* If the requested len is greater than or equal to the string
2473 length, call strcat. */
2474 if (TREE_CODE (len) == INTEGER_CST && p
2475 && compare_tree_int (len, strlen (p)) >= 0)
2478 tree_cons (NULL_TREE, dst, build_tree_list (NULL_TREE, src)),
2479 fn = built_in_decls[BUILT_IN_STRCAT];
2481 /* If the replacement _DECL isn't initialized, don't do the
2486 return expand_expr (build_function_call_expr (fn, newarglist),
2487 target, mode, EXPAND_NORMAL);
2493 /* Expand expression EXP, which is a call to the strspn builtin.
2494 Return 0 if we failed the caller should emit a normal call,
2495 otherwise try to get the result in TARGET, if convenient. */
2497 expand_builtin_strspn (arglist, target, mode)
2500 enum machine_mode mode;
2502 /* If we need to check memory accesses, call the library function. */
2503 if (current_function_check_memory_usage)
2506 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2510 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
2511 const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
2513 /* If both arguments are constants, evaluate at compile-time. */
2516 const size_t r = strspn (p1, p2);
2517 return expand_expr (size_int (r), target, mode, EXPAND_NORMAL);
2520 /* If either argument is "", return 0. */
2521 if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
2523 /* Evaluate and ignore both arguments in case either one has
2525 expand_expr (s1, const0_rtx, VOIDmode, EXPAND_NORMAL);
2526 expand_expr (s2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2533 /* Expand expression EXP, which is a call to the strcspn builtin.
2534 Return 0 if we failed the caller should emit a normal call,
2535 otherwise try to get the result in TARGET, if convenient. */
2537 expand_builtin_strcspn (arglist, target, mode)
2540 enum machine_mode mode;
2542 /* If we need to check memory accesses, call the library function. */
2543 if (current_function_check_memory_usage)
2546 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2550 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
2551 const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
2553 /* If both arguments are constants, evaluate at compile-time. */
2556 const size_t r = strcspn (p1, p2);
2557 return expand_expr (size_int (r), target, mode, EXPAND_NORMAL);
2560 /* If the first argument is "", return 0. */
2561 if (p1 && *p1 == '\0')
2563 /* Evaluate and ignore argument s2 in case it has
2565 expand_expr (s2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2569 /* If the second argument is "", return __builtin_strlen(s1). */
2570 if (p2 && *p2 == '\0')
2572 tree newarglist = build_tree_list (NULL_TREE, s1),
2573 fn = built_in_decls[BUILT_IN_STRLEN];
2575 /* If the replacement _DECL isn't initialized, don't do the
2580 return expand_expr (build_function_call_expr (fn, newarglist),
2581 target, mode, EXPAND_NORMAL);
2587 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
2588 if that's convenient. */
2591 expand_builtin_saveregs ()
2595 /* Don't do __builtin_saveregs more than once in a function.
2596 Save the result of the first call and reuse it. */
2597 if (saveregs_value != 0)
2598 return saveregs_value;
2600 /* When this function is called, it means that registers must be
2601 saved on entry to this function. So we migrate the call to the
2602 first insn of this function. */
2606 #ifdef EXPAND_BUILTIN_SAVEREGS
2607 /* Do whatever the machine needs done in this case. */
2608 val = EXPAND_BUILTIN_SAVEREGS ();
2610 /* ??? We used to try and build up a call to the out of line function,
2611 guessing about what registers needed saving etc. This became much
2612 harder with __builtin_va_start, since we don't have a tree for a
2613 call to __builtin_saveregs to fall back on. There was exactly one
2614 port (i860) that used this code, and I'm unconvinced it could actually
2615 handle the general case. So we no longer try to handle anything
2616 weird and make the backend absorb the evil. */
2618 error ("__builtin_saveregs not supported by this target");
2625 saveregs_value = val;
2627 /* Put the sequence after the NOTE that starts the function. If this
2628 is inside a SEQUENCE, make the outer-level insn chain current, so
2629 the code is placed at the start of the function. */
2630 push_topmost_sequence ();
2631 emit_insns_after (seq, get_insns ());
2632 pop_topmost_sequence ();
2637 /* __builtin_args_info (N) returns word N of the arg space info
2638 for the current function. The number and meanings of words
2639 is controlled by the definition of CUMULATIVE_ARGS. */
2642 expand_builtin_args_info (exp)
2645 tree arglist = TREE_OPERAND (exp, 1);
2646 int nwords = sizeof (CUMULATIVE_ARGS) / sizeof (int);
2647 int *word_ptr = (int *) ¤t_function_args_info;
2649 /* These are used by the code below that is if 0'ed away */
2651 tree type, elts, result;
2654 if (sizeof (CUMULATIVE_ARGS) % sizeof (int) != 0)
2659 tree arg = TREE_VALUE (arglist);
2660 if (TREE_CODE (arg) != INTEGER_CST)
2661 error ("argument of `__builtin_args_info' must be constant");
2664 int wordnum = TREE_INT_CST_LOW (arg);
2666 if (wordnum < 0 || wordnum >= nwords || TREE_INT_CST_HIGH (arg))
2667 error ("argument of `__builtin_args_info' out of range");
2669 return GEN_INT (word_ptr[wordnum]);
2673 error ("missing argument in `__builtin_args_info'");
2678 for (i = 0; i < nwords; i++)
2679 elts = tree_cons (NULL_TREE, build_int_2 (word_ptr[i], 0));
2681 type = build_array_type (integer_type_node,
2682 build_index_type (build_int_2 (nwords, 0)));
2683 result = build (CONSTRUCTOR, type, NULL_TREE, nreverse (elts));
2684 TREE_CONSTANT (result) = 1;
2685 TREE_STATIC (result) = 1;
2686 result = build1 (INDIRECT_REF, build_pointer_type (type), result);
2687 TREE_CONSTANT (result) = 1;
2688 return expand_expr (result, NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD);
2692 /* Expand ARGLIST, from a call to __builtin_next_arg. */
2694 expand_builtin_next_arg (arglist)
2697 tree fntype = TREE_TYPE (current_function_decl);
2699 if ((TYPE_ARG_TYPES (fntype) == 0
2700 || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype)))
2702 && ! current_function_varargs)
2704 error ("`va_start' used in function with fixed args");
2710 tree last_parm = tree_last (DECL_ARGUMENTS (current_function_decl));
2711 tree arg = TREE_VALUE (arglist);
2713 /* Strip off all nops for the sake of the comparison. This
2714 is not quite the same as STRIP_NOPS. It does more.
2715 We must also strip off INDIRECT_EXPR for C++ reference
2717 while (TREE_CODE (arg) == NOP_EXPR
2718 || TREE_CODE (arg) == CONVERT_EXPR
2719 || TREE_CODE (arg) == NON_LVALUE_EXPR
2720 || TREE_CODE (arg) == INDIRECT_REF)
2721 arg = TREE_OPERAND (arg, 0);
2722 if (arg != last_parm)
2723 warning ("second parameter of `va_start' not last named argument");
2725 else if (! current_function_varargs)
2726 /* Evidently an out of date version of <stdarg.h>; can't validate
2727 va_start's second argument, but can still work as intended. */
2728 warning ("`__builtin_next_arg' called without an argument");
2730 return expand_binop (Pmode, add_optab,
2731 current_function_internal_arg_pointer,
2732 current_function_arg_offset_rtx,
2733 NULL_RTX, 0, OPTAB_LIB_WIDEN);
2736 /* Make it easier for the backends by protecting the valist argument
2737 from multiple evaluations. */
2740 stabilize_va_list (valist, needs_lvalue)
2744 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
2746 if (TREE_SIDE_EFFECTS (valist))
2747 valist = save_expr (valist);
2749 /* For this case, the backends will be expecting a pointer to
2750 TREE_TYPE (va_list_type_node), but it's possible we've
2751 actually been given an array (an actual va_list_type_node).
2753 if (TREE_CODE (TREE_TYPE (valist)) == ARRAY_TYPE)
2755 tree p1 = build_pointer_type (TREE_TYPE (va_list_type_node));
2756 tree p2 = build_pointer_type (va_list_type_node);
2758 valist = build1 (ADDR_EXPR, p2, valist);
2759 valist = fold (build1 (NOP_EXPR, p1, valist));
2768 if (! TREE_SIDE_EFFECTS (valist))
2771 pt = build_pointer_type (va_list_type_node);
2772 valist = fold (build1 (ADDR_EXPR, pt, valist));
2773 TREE_SIDE_EFFECTS (valist) = 1;
2776 if (TREE_SIDE_EFFECTS (valist))
2777 valist = save_expr (valist);
2778 valist = fold (build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (valist)),
2785 /* The "standard" implementation of va_start: just assign `nextarg' to
2788 std_expand_builtin_va_start (stdarg_p, valist, nextarg)
2797 /* The dummy named parameter is declared as a 'word' sized
2798 object, but if a 'word' is smaller than an 'int', it would
2799 have been promoted to int when it was added to the arglist. */
2800 int align = PARM_BOUNDARY / BITS_PER_UNIT;
2801 int size = MAX (UNITS_PER_WORD,
2802 GET_MODE_SIZE (TYPE_MODE (integer_type_node)));
2803 int offset = ((size + align - 1) / align) * align;
2804 nextarg = plus_constant (nextarg, -offset);
2807 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
2808 make_tree (ptr_type_node, nextarg));
2809 TREE_SIDE_EFFECTS (t) = 1;
2811 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2814 /* Expand ARGLIST, which from a call to __builtin_stdarg_va_start or
2815 __builtin_varargs_va_start, depending on STDARG_P. */
2817 expand_builtin_va_start (stdarg_p, arglist)
2822 tree chain = arglist, valist;
2825 nextarg = expand_builtin_next_arg (chain = TREE_CHAIN (arglist));
2827 nextarg = expand_builtin_next_arg (NULL_TREE);
2829 if (TREE_CHAIN (chain))
2830 error ("too many arguments to function `va_start'");
2832 valist = stabilize_va_list (TREE_VALUE (arglist), 1);
2834 #ifdef EXPAND_BUILTIN_VA_START
2835 EXPAND_BUILTIN_VA_START (stdarg_p, valist, nextarg);
2837 std_expand_builtin_va_start (stdarg_p, valist, nextarg);
2843 /* The "standard" implementation of va_arg: read the value from the
2844 current (padded) address and increment by the (padded) size. */
2847 std_expand_builtin_va_arg (valist, type)
2851 HOST_WIDE_INT align;
2852 HOST_WIDE_INT rounded_size;
2855 /* Compute the rounded size of the type. */
2856 align = PARM_BOUNDARY / BITS_PER_UNIT;
2857 rounded_size = (((int_size_in_bytes (type) + align - 1) / align) * align);
2861 if (PAD_VARARGS_DOWN)
2863 /* Small args are padded downward. */
2866 adj = TREE_INT_CST_LOW (TYPE_SIZE (type)) / BITS_PER_UNIT;
2867 if (rounded_size > align)
2870 addr_tree = build (PLUS_EXPR, TREE_TYPE (addr_tree), addr_tree,
2871 build_int_2 (rounded_size - adj, 0));
2874 addr = expand_expr (addr_tree, NULL_RTX, Pmode, EXPAND_NORMAL);
2875 addr = copy_to_reg (addr);
2877 /* Compute new value for AP. */
2878 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
2879 build (PLUS_EXPR, TREE_TYPE (valist), valist,
2880 build_int_2 (rounded_size, 0)));
2881 TREE_SIDE_EFFECTS (t) = 1;
2882 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2887 /* Expand __builtin_va_arg, which is not really a builtin function, but
2888 a very special sort of operator. */
2891 expand_builtin_va_arg (valist, type)
2895 tree promoted_type, want_va_type, have_va_type;
2897 /* Verify that valist is of the proper type. */
2899 want_va_type = va_list_type_node;
2900 have_va_type = TREE_TYPE (valist);
2901 if (TREE_CODE (want_va_type) == ARRAY_TYPE)
2903 /* If va_list is an array type, the argument may have decayed
2904 to a pointer type, e.g. by being passed to another function.
2905 In that case, unwrap both types so that we can compare the
2906 underlying records. */
2907 if (TREE_CODE (have_va_type) == ARRAY_TYPE
2908 || TREE_CODE (have_va_type) == POINTER_TYPE)
2910 want_va_type = TREE_TYPE (want_va_type);
2911 have_va_type = TREE_TYPE (have_va_type);
2914 if (TYPE_MAIN_VARIANT (want_va_type) != TYPE_MAIN_VARIANT (have_va_type))
2916 error ("first argument to `va_arg' not of type `va_list'");
2920 /* Generate a diagnostic for requesting data of a type that cannot
2921 be passed through `...' due to type promotion at the call site. */
2922 else if ((promoted_type = (*lang_type_promotes_to) (type)) != NULL_TREE)
2924 const char *name = "<anonymous type>", *pname = 0;
2925 static int gave_help;
2927 if (TYPE_NAME (type))
2929 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
2930 name = IDENTIFIER_POINTER (TYPE_NAME (type));
2931 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
2932 && DECL_NAME (TYPE_NAME (type)))
2933 name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
2935 if (TYPE_NAME (promoted_type))
2937 if (TREE_CODE (TYPE_NAME (promoted_type)) == IDENTIFIER_NODE)
2938 pname = IDENTIFIER_POINTER (TYPE_NAME (promoted_type));
2939 else if (TREE_CODE (TYPE_NAME (promoted_type)) == TYPE_DECL
2940 && DECL_NAME (TYPE_NAME (promoted_type)))
2941 pname = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (promoted_type)));
2944 error ("`%s' is promoted to `%s' when passed through `...'", name, pname);
2948 error ("(so you should pass `%s' not `%s' to `va_arg')", pname, name);
2955 /* Make it easier for the backends by protecting the valist argument
2956 from multiple evaluations. */
2957 valist = stabilize_va_list (valist, 0);
2959 #ifdef EXPAND_BUILTIN_VA_ARG
2960 addr = EXPAND_BUILTIN_VA_ARG (valist, type);
2962 addr = std_expand_builtin_va_arg (valist, type);
2966 result = gen_rtx_MEM (TYPE_MODE (type), addr);
2967 MEM_ALIAS_SET (result) = get_varargs_alias_set ();
2972 /* Expand ARGLIST, from a call to __builtin_va_end. */
2975 expand_builtin_va_end (arglist)
2978 tree valist = TREE_VALUE (arglist);
2980 #ifdef EXPAND_BUILTIN_VA_END
2981 valist = stabilize_va_list (valist, 0);
2982 EXPAND_BUILTIN_VA_END(arglist);
2984 /* Evaluate for side effects, if needed. I hate macros that don't
2986 if (TREE_SIDE_EFFECTS (valist))
2987 expand_expr (valist, const0_rtx, VOIDmode, EXPAND_NORMAL);
2993 /* Expand ARGLIST, from a call to __builtin_va_copy. We do this as a
2994 builtin rather than just as an assignment in stdarg.h because of the
2995 nastiness of array-type va_list types. */
2998 expand_builtin_va_copy (arglist)
3003 dst = TREE_VALUE (arglist);
3004 src = TREE_VALUE (TREE_CHAIN (arglist));
3006 dst = stabilize_va_list (dst, 1);
3007 src = stabilize_va_list (src, 0);
3009 if (TREE_CODE (va_list_type_node) != ARRAY_TYPE)
3011 t = build (MODIFY_EXPR, va_list_type_node, dst, src);
3012 TREE_SIDE_EFFECTS (t) = 1;
3013 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
3017 rtx dstb, srcb, size;
3019 /* Evaluate to pointers. */
3020 dstb = expand_expr (dst, NULL_RTX, Pmode, EXPAND_NORMAL);
3021 srcb = expand_expr (src, NULL_RTX, Pmode, EXPAND_NORMAL);
3022 size = expand_expr (TYPE_SIZE_UNIT (va_list_type_node), NULL_RTX,
3023 VOIDmode, EXPAND_NORMAL);
3025 /* "Dereference" to BLKmode memories. */
3026 dstb = gen_rtx_MEM (BLKmode, dstb);
3027 MEM_ALIAS_SET (dstb) = get_alias_set (TREE_TYPE (TREE_TYPE (dst)));
3028 srcb = gen_rtx_MEM (BLKmode, srcb);
3029 MEM_ALIAS_SET (srcb) = get_alias_set (TREE_TYPE (TREE_TYPE (src)));
3032 emit_block_move (dstb, srcb, size, TYPE_ALIGN (va_list_type_node));
3038 /* Expand a call to one of the builtin functions __builtin_frame_address or
3039 __builtin_return_address. */
3041 expand_builtin_frame_address (exp)
3044 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3045 tree arglist = TREE_OPERAND (exp, 1);
3047 /* The argument must be a nonnegative integer constant.
3048 It counts the number of frames to scan up the stack.
3049 The value is the return address saved in that frame. */
3051 /* Warning about missing arg was already issued. */
3053 else if (TREE_CODE (TREE_VALUE (arglist)) != INTEGER_CST
3054 || tree_int_cst_sgn (TREE_VALUE (arglist)) < 0)
3056 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3057 error ("invalid arg to `__builtin_frame_address'");
3059 error ("invalid arg to `__builtin_return_address'");
3064 rtx tem = expand_builtin_return_addr (DECL_FUNCTION_CODE (fndecl),
3065 TREE_INT_CST_LOW (TREE_VALUE (arglist)),
3066 hard_frame_pointer_rtx);
3068 /* Some ports cannot access arbitrary stack frames. */
3071 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3072 warning ("unsupported arg to `__builtin_frame_address'");
3074 warning ("unsupported arg to `__builtin_return_address'");
3078 /* For __builtin_frame_address, return what we've got. */
3079 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3082 if (GET_CODE (tem) != REG
3083 && ! CONSTANT_P (tem))
3084 tem = copy_to_mode_reg (Pmode, tem);
3089 /* Expand a call to the alloca builtin, with arguments ARGLIST. Return 0 if
3090 we failed and the caller should emit a normal call, otherwise try to get
3091 the result in TARGET, if convenient. */
3094 expand_builtin_alloca (arglist, target)
3101 if (!validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
3104 /* Compute the argument. */
3105 op0 = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
3107 /* Allocate the desired space. */
3108 result = allocate_dynamic_stack_space (op0, target, BITS_PER_UNIT);
3110 #ifdef POINTERS_EXTEND_UNSIGNED
3111 result = convert_memory_address (ptr_mode, result);
3117 /* Expand a call to the ffs builtin. The arguments are in ARGLIST.
3118 Return 0 if a normal call should be emitted rather than expanding the
3119 function in-line. If convenient, the result should be placed in TARGET.
3120 SUBTARGET may be used as the target for computing one of EXP's operands. */
3123 expand_builtin_ffs (arglist, target, subtarget)
3125 rtx target, subtarget;
3128 if (!validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
3131 /* Compute the argument. */
3132 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
3133 /* Compute ffs, into TARGET if possible.
3134 Set TARGET to wherever the result comes back. */
3135 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
3136 ffs_optab, op0, target, 1);
3142 /* If the string passed to fputs is a constant and is one character
3143 long, we attempt to transform this call into __builtin_fputc(). */
3146 expand_builtin_fputs (arglist, ignore)
3150 tree len, fn, fn_fputc = built_in_decls[BUILT_IN_FPUTC],
3151 fn_fwrite = built_in_decls[BUILT_IN_FWRITE];
3153 /* If the return value is used, or the replacement _DECL isn't
3154 initialized, don't do the transformation. */
3155 if (!ignore || !fn_fputc || !fn_fwrite)
3158 /* Verify the arguments in the original call. */
3159 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
3160 || current_function_check_memory_usage)
3163 /* Get the length of the string passed to fputs. If the length
3164 can't be determined, punt. */
3165 if (!(len = c_strlen (TREE_VALUE (arglist)))
3166 || TREE_CODE (len) != INTEGER_CST)
3169 switch (compare_tree_int (len, 1))
3171 case -1: /* length is 0, delete the call entirely . */
3173 /* Evaluate and ignore the argument in case it has
3175 expand_expr (TREE_VALUE (TREE_CHAIN (arglist)), const0_rtx,
3176 VOIDmode, EXPAND_NORMAL);
3179 case 0: /* length is 1, call fputc. */
3181 const char *p = c_getstr (TREE_VALUE (arglist));
3185 /* New argument list transforming fputs(string, stream) to
3186 fputc(string[0], stream). */
3188 build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)));
3190 tree_cons (NULL_TREE, build_int_2 (p[0], 0), arglist);
3196 case 1: /* length is greater than 1, call fwrite. */
3198 tree string_arg = TREE_VALUE (arglist);
3200 /* New argument list transforming fputs(string, stream) to
3201 fwrite(string, 1, len, stream). */
3202 arglist = build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)));
3203 arglist = tree_cons (NULL_TREE, len, arglist);
3204 arglist = tree_cons (NULL_TREE, size_one_node, arglist);
3205 arglist = tree_cons (NULL_TREE, string_arg, arglist);
3213 return expand_expr (build_function_call_expr (fn, arglist),
3214 (ignore ? const0_rtx : NULL_RTX),
3215 VOIDmode, EXPAND_NORMAL);
3218 /* Expand a call to __builtin_expect. We return our argument and emit a
3219 NOTE_INSN_EXPECTED_VALUE note. This is the expansion of __builtin_expect in
3220 a non-jump context. */
3223 expand_builtin_expect (arglist, target)
3230 if (arglist == NULL_TREE
3231 || TREE_CHAIN (arglist) == NULL_TREE)
3233 exp = TREE_VALUE (arglist);
3234 c = TREE_VALUE (TREE_CHAIN (arglist));
3236 if (TREE_CODE (c) != INTEGER_CST)
3238 error ("second arg to `__builtin_expect' must be a constant");
3239 c = integer_zero_node;
3242 target = expand_expr (exp, target, VOIDmode, EXPAND_NORMAL);
3244 /* Don't bother with expected value notes for integral constants. */
3245 if (GET_CODE (target) != CONST_INT)
3247 /* We do need to force this into a register so that we can be
3248 moderately sure to be able to correctly interpret the branch
3250 target = force_reg (GET_MODE (target), target);
3252 rtx_c = expand_expr (c, NULL_RTX, GET_MODE (target), EXPAND_NORMAL);
3254 note = emit_note (NULL, NOTE_INSN_EXPECTED_VALUE);
3255 NOTE_EXPECTED_VALUE (note) = gen_rtx_EQ (VOIDmode, target, rtx_c);
3261 /* Like expand_builtin_expect, except do this in a jump context. This is
3262 called from do_jump if the conditional is a __builtin_expect. Return either
3263 a SEQUENCE of insns to emit the jump or NULL if we cannot optimize
3264 __builtin_expect. We need to optimize this at jump time so that machines
3265 like the PowerPC don't turn the test into a SCC operation, and then jump
3266 based on the test being 0/1. */
3269 expand_builtin_expect_jump (exp, if_false_label, if_true_label)
3274 tree arglist = TREE_OPERAND (exp, 1);
3275 tree arg0 = TREE_VALUE (arglist);
3276 tree arg1 = TREE_VALUE (TREE_CHAIN (arglist));
3279 /* Only handle __builtin_expect (test, 0) and
3280 __builtin_expect (test, 1). */
3281 if (TREE_CODE (TREE_TYPE (arg1)) == INTEGER_TYPE
3282 && TREE_CODE (arg1) == INTEGER_CST
3283 && (TREE_INT_CST_LOW (arg1) == 0 || TREE_INT_CST_LOW (arg1) == 1)
3284 && TREE_INT_CST_HIGH (arg1) == 0)
3289 /* If we fail to locate an appropriate conditional jump, we'll
3290 fall back to normal evaluation. Ensure that the expression
3291 can be re-evaluated. */
3292 switch (unsafe_for_reeval (arg0))
3297 case 1: /* Mildly unsafe. */
3298 arg0 = unsave_expr (arg0);
3301 case 2: /* Wildly unsafe. */
3305 /* Expand the jump insns. */
3307 do_jump (arg0, if_false_label, if_true_label);
3308 ret = gen_sequence ();
3311 /* Now that the __builtin_expect has been validated, go through and add
3312 the expect's to each of the conditional jumps. If we run into an
3313 error, just give up and generate the 'safe' code of doing a SCC
3314 operation and then doing a branch on that. */
3315 for (j = 0; j < XVECLEN (ret, 0); j++)
3317 rtx insn = XVECEXP (ret, 0, j);
3320 if (GET_CODE (insn) == JUMP_INSN && any_condjump_p (insn)
3321 && (pattern = pc_set (insn)) != NULL_RTX)
3323 rtx ifelse = SET_SRC (pattern);
3327 if (GET_CODE (ifelse) != IF_THEN_ELSE)
3330 if (GET_CODE (XEXP (ifelse, 1)) == LABEL_REF)
3333 label = XEXP (XEXP (ifelse, 1), 0);
3335 /* An inverted jump reverses the probabilities. */
3336 else if (GET_CODE (XEXP (ifelse, 2)) == LABEL_REF)
3339 label = XEXP (XEXP (ifelse, 2), 0);
3341 /* We shouldn't have to worry about conditional returns during
3342 the expansion stage, but handle it gracefully anyway. */
3343 else if (GET_CODE (XEXP (ifelse, 1)) == RETURN)
3348 /* An inverted return reverses the probabilities. */
3349 else if (GET_CODE (XEXP (ifelse, 2)) == RETURN)
3357 /* If the test is expected to fail, reverse the
3359 if (TREE_INT_CST_LOW (arg1) == 0)
3362 /* If we are jumping to the false label, reverse the
3364 if (label == NULL_RTX)
3365 ; /* conditional return */
3366 else if (label == if_false_label)
3368 else if (label != if_true_label)
3372 predict_insn_def (insn, PRED_BUILTIN_EXPECT, taken);
3376 /* If no jumps were modified, fail and do __builtin_expect the normal
3386 /* Expand an expression EXP that calls a built-in function,
3387 with result going to TARGET if that's convenient
3388 (and in mode MODE if that's convenient).
3389 SUBTARGET may be used as the target for computing one of EXP's operands.
3390 IGNORE is nonzero if the value is to be ignored. */
3393 expand_builtin (exp, target, subtarget, mode, ignore)
3397 enum machine_mode mode;
3400 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3401 tree arglist = TREE_OPERAND (exp, 1);
3402 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
3404 #ifdef MD_EXPAND_BUILTIN
3405 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
3406 return MD_EXPAND_BUILTIN (exp, target, subtarget, mode, ignore);
3409 /* When not optimizing, generate calls to library functions for a certain
3411 if (! optimize && ! CALLED_AS_BUILT_IN (fndecl)
3412 && (fcode == BUILT_IN_SIN || fcode == BUILT_IN_COS
3413 || fcode == BUILT_IN_FSQRT || fcode == BUILT_IN_SQRTF
3414 || fcode == BUILT_IN_SQRTL || fcode == BUILT_IN_MEMSET
3415 || fcode == BUILT_IN_MEMCPY || fcode == BUILT_IN_MEMCMP
3416 || fcode == BUILT_IN_BCMP || fcode == BUILT_IN_BZERO
3417 || fcode == BUILT_IN_INDEX || fcode == BUILT_IN_RINDEX
3418 || fcode == BUILT_IN_STRCHR || fcode == BUILT_IN_STRRCHR
3419 || fcode == BUILT_IN_STRLEN || fcode == BUILT_IN_STRCPY
3420 || fcode == BUILT_IN_STRNCPY || fcode == BUILT_IN_STRNCMP
3421 || fcode == BUILT_IN_STRSTR || fcode == BUILT_IN_STRPBRK
3422 || fcode == BUILT_IN_STRCAT || fcode == BUILT_IN_STRNCAT
3423 || fcode == BUILT_IN_STRSPN || fcode == BUILT_IN_STRCSPN
3424 || fcode == BUILT_IN_STRCMP || fcode == BUILT_IN_FFS
3425 || fcode == BUILT_IN_PUTCHAR || fcode == BUILT_IN_PUTS
3426 || fcode == BUILT_IN_PRINTF || fcode == BUILT_IN_FPUTC
3427 || fcode == BUILT_IN_FPUTS || fcode == BUILT_IN_FWRITE))
3428 return expand_call (exp, target, ignore);
3434 case BUILT_IN_LLABS:
3435 case BUILT_IN_IMAXABS:
3437 case BUILT_IN_FABSF:
3438 case BUILT_IN_FABSL:
3439 /* build_function_call changes these into ABS_EXPR. */
3443 case BUILT_IN_CONJF:
3444 case BUILT_IN_CONJL:
3445 case BUILT_IN_CREAL:
3446 case BUILT_IN_CREALF:
3447 case BUILT_IN_CREALL:
3448 case BUILT_IN_CIMAG:
3449 case BUILT_IN_CIMAGF:
3450 case BUILT_IN_CIMAGL:
3451 /* expand_tree_builtin changes these into CONJ_EXPR, REALPART_EXPR
3452 and IMAGPART_EXPR. */
3461 /* Treat these like sqrt only if unsafe math optimizations are allowed,
3462 because of possible accuracy problems. */
3463 if (! flag_unsafe_math_optimizations)
3465 case BUILT_IN_FSQRT:
3466 case BUILT_IN_SQRTF:
3467 case BUILT_IN_SQRTL:
3468 target = expand_builtin_mathfn (exp, target, subtarget);
3476 case BUILT_IN_APPLY_ARGS:
3477 return expand_builtin_apply_args ();
3479 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
3480 FUNCTION with a copy of the parameters described by
3481 ARGUMENTS, and ARGSIZE. It returns a block of memory
3482 allocated on the stack into which is stored all the registers
3483 that might possibly be used for returning the result of a
3484 function. ARGUMENTS is the value returned by
3485 __builtin_apply_args. ARGSIZE is the number of bytes of
3486 arguments that must be copied. ??? How should this value be
3487 computed? We'll also need a safe worst case value for varargs
3489 case BUILT_IN_APPLY:
3490 if (!validate_arglist (arglist, POINTER_TYPE,
3491 POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
3492 && !validate_arglist (arglist, REFERENCE_TYPE,
3493 POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
3501 for (t = arglist, i = 0; t; t = TREE_CHAIN (t), i++)
3502 ops[i] = expand_expr (TREE_VALUE (t), NULL_RTX, VOIDmode, 0);
3504 return expand_builtin_apply (ops[0], ops[1], ops[2]);
3507 /* __builtin_return (RESULT) causes the function to return the
3508 value described by RESULT. RESULT is address of the block of
3509 memory returned by __builtin_apply. */
3510 case BUILT_IN_RETURN:
3511 if (validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
3512 expand_builtin_return (expand_expr (TREE_VALUE (arglist),
3513 NULL_RTX, VOIDmode, 0));
3516 case BUILT_IN_SAVEREGS:
3517 return expand_builtin_saveregs ();
3519 case BUILT_IN_ARGS_INFO:
3520 return expand_builtin_args_info (exp);
3522 /* Return the address of the first anonymous stack arg. */
3523 case BUILT_IN_NEXT_ARG:
3524 return expand_builtin_next_arg (arglist);
3526 case BUILT_IN_CLASSIFY_TYPE:
3527 return expand_builtin_classify_type (arglist);
3529 case BUILT_IN_CONSTANT_P:
3530 return expand_builtin_constant_p (exp);
3532 case BUILT_IN_FRAME_ADDRESS:
3533 case BUILT_IN_RETURN_ADDRESS:
3534 return expand_builtin_frame_address (exp);
3536 /* Returns the address of the area where the structure is returned.
3538 case BUILT_IN_AGGREGATE_INCOMING_ADDRESS:
3540 || ! AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl)))
3541 || GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl))) != MEM)
3544 return XEXP (DECL_RTL (DECL_RESULT (current_function_decl)), 0);
3546 case BUILT_IN_ALLOCA:
3547 target = expand_builtin_alloca (arglist, target);
3553 target = expand_builtin_ffs (arglist, target, subtarget);
3558 case BUILT_IN_STRLEN:
3559 target = expand_builtin_strlen (exp, target);
3564 case BUILT_IN_STRCPY:
3565 target = expand_builtin_strcpy (exp);
3570 case BUILT_IN_STRNCPY:
3571 target = expand_builtin_strncpy (arglist, target, mode);
3576 case BUILT_IN_STRCAT:
3577 target = expand_builtin_strcat (arglist, target, mode);
3582 case BUILT_IN_STRNCAT:
3583 target = expand_builtin_strncat (arglist, target, mode);
3588 case BUILT_IN_STRSPN:
3589 target = expand_builtin_strspn (arglist, target, mode);
3594 case BUILT_IN_STRCSPN:
3595 target = expand_builtin_strcspn (arglist, target, mode);
3600 case BUILT_IN_STRSTR:
3601 target = expand_builtin_strstr (arglist, target, mode);
3606 case BUILT_IN_STRPBRK:
3607 target = expand_builtin_strpbrk (arglist, target, mode);
3612 case BUILT_IN_INDEX:
3613 case BUILT_IN_STRCHR:
3614 target = expand_builtin_strchr (arglist, target, mode);
3619 case BUILT_IN_RINDEX:
3620 case BUILT_IN_STRRCHR:
3621 target = expand_builtin_strrchr (arglist, target, mode);
3626 case BUILT_IN_MEMCPY:
3627 target = expand_builtin_memcpy (arglist);
3632 case BUILT_IN_MEMSET:
3633 target = expand_builtin_memset (exp);
3638 case BUILT_IN_BZERO:
3639 target = expand_builtin_bzero (exp);
3644 case BUILT_IN_STRCMP:
3645 target = expand_builtin_strcmp (exp, target, mode);
3650 case BUILT_IN_STRNCMP:
3651 target = expand_builtin_strncmp (exp, target, mode);
3656 /* These comparison functions need an instruction that returns an actual
3657 index. An ordinary compare that just sets the condition codes
3659 #ifdef HAVE_cmpstrsi
3661 case BUILT_IN_MEMCMP:
3662 target = expand_builtin_memcmp (exp, arglist, target);
3668 case BUILT_IN_MEMCMP:
3672 case BUILT_IN_SETJMP:
3673 target = expand_builtin_setjmp (arglist, target);
3678 /* __builtin_longjmp is passed a pointer to an array of five words.
3679 It's similar to the C library longjmp function but works with
3680 __builtin_setjmp above. */
3681 case BUILT_IN_LONGJMP:
3682 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
3686 rtx buf_addr = expand_expr (TREE_VALUE (arglist), subtarget,
3688 rtx value = expand_expr (TREE_VALUE (TREE_CHAIN (arglist)),
3689 NULL_RTX, VOIDmode, 0);
3691 if (value != const1_rtx)
3693 error ("__builtin_longjmp second argument must be 1");
3697 expand_builtin_longjmp (buf_addr, value);
3704 emit_insn (gen_trap ());
3707 error ("__builtin_trap not supported by this target");
3711 case BUILT_IN_PUTCHAR:
3713 case BUILT_IN_FPUTC:
3714 case BUILT_IN_FWRITE:
3716 case BUILT_IN_FPUTS:
3717 target = expand_builtin_fputs (arglist, ignore);
3722 /* Various hooks for the DWARF 2 __throw routine. */
3723 case BUILT_IN_UNWIND_INIT:
3724 expand_builtin_unwind_init ();
3726 case BUILT_IN_DWARF_CFA:
3727 return virtual_cfa_rtx;
3728 #ifdef DWARF2_UNWIND_INFO
3729 case BUILT_IN_DWARF_FP_REGNUM:
3730 return expand_builtin_dwarf_fp_regnum ();
3731 case BUILT_IN_INIT_DWARF_REG_SIZES:
3732 expand_builtin_init_dwarf_reg_sizes (TREE_VALUE (arglist));
3735 case BUILT_IN_FROB_RETURN_ADDR:
3736 return expand_builtin_frob_return_addr (TREE_VALUE (arglist));
3737 case BUILT_IN_EXTRACT_RETURN_ADDR:
3738 return expand_builtin_extract_return_addr (TREE_VALUE (arglist));
3739 case BUILT_IN_EH_RETURN:
3740 expand_builtin_eh_return (TREE_VALUE (arglist),
3741 TREE_VALUE (TREE_CHAIN (arglist)));
3743 #ifdef EH_RETURN_DATA_REGNO
3744 case BUILT_IN_EH_RETURN_DATA_REGNO:
3745 return expand_builtin_eh_return_data_regno (arglist);
3747 case BUILT_IN_VARARGS_START:
3748 return expand_builtin_va_start (0, arglist);
3749 case BUILT_IN_STDARG_START:
3750 return expand_builtin_va_start (1, arglist);
3751 case BUILT_IN_VA_END:
3752 return expand_builtin_va_end (arglist);
3753 case BUILT_IN_VA_COPY:
3754 return expand_builtin_va_copy (arglist);
3755 case BUILT_IN_EXPECT:
3756 return expand_builtin_expect (arglist, target);
3758 default: /* just do library call, if unknown builtin */
3759 error ("built-in function `%s' not currently supported",
3760 IDENTIFIER_POINTER (DECL_NAME (fndecl)));
3763 /* The switch statement above can drop through to cause the function
3764 to be called normally. */
3765 return expand_call (exp, target, ignore);
3768 /* Fold a call to __builtin_constant_p, if we know it will evaluate to a
3769 constant. ARGLIST is the argument list of the call. */
3772 fold_builtin_constant_p (arglist)
3778 arglist = TREE_VALUE (arglist);
3780 /* We return 1 for a numeric type that's known to be a constant
3781 value at compile-time or for an aggregate type that's a
3782 literal constant. */
3783 STRIP_NOPS (arglist);
3785 /* If we know this is a constant, emit the constant of one. */
3786 if (TREE_CODE_CLASS (TREE_CODE (arglist)) == 'c'
3787 || (TREE_CODE (arglist) == CONSTRUCTOR
3788 && TREE_CONSTANT (arglist))
3789 || (TREE_CODE (arglist) == ADDR_EXPR
3790 && TREE_CODE (TREE_OPERAND (arglist, 0)) == STRING_CST))
3791 return integer_one_node;
3793 /* If we aren't going to be running CSE or this expression
3794 has side effects, show we don't know it to be a constant.
3795 Likewise if it's a pointer or aggregate type since in those
3796 case we only want literals, since those are only optimized
3797 when generating RTL, not later. */
3798 if (TREE_SIDE_EFFECTS (arglist) || cse_not_expected
3799 || AGGREGATE_TYPE_P (TREE_TYPE (arglist))
3800 || POINTER_TYPE_P (TREE_TYPE (arglist)))
3801 return integer_zero_node;
3806 /* Used by constant folding to eliminate some builtin calls early. EXP is
3807 the CALL_EXPR of a call to a builtin function. */
3813 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3814 tree arglist = TREE_OPERAND (exp, 1);
3815 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
3817 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
3822 case BUILT_IN_CONSTANT_P:
3823 return fold_builtin_constant_p (arglist);
3825 case BUILT_IN_STRLEN:
3826 if (validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
3828 tree len = c_strlen (TREE_VALUE (arglist));
3842 build_function_call_expr (fn, arglist)
3847 call_expr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), fn);
3848 call_expr = build (CALL_EXPR, TREE_TYPE (TREE_TYPE (fn)),
3849 call_expr, arglist);
3850 TREE_SIDE_EFFECTS (call_expr) = 1;
3851 return fold (call_expr);
3854 /* This function validates the types of a function call argument list
3855 represented as a tree chain of parameters against a specified list
3856 of tree_codes. If the last specifier is a 0, that represents an
3857 ellipses, otherwise the last specifier must be a VOID_TYPE. */
3859 validate_arglist VPARAMS ((tree arglist, ...))
3861 #ifndef ANSI_PROTOTYPES
3864 enum tree_code code;
3867 VA_START (ap, arglist);
3869 #ifndef ANSI_PROTOTYPES
3870 arglist = va_arg (ap, tree);
3874 code = va_arg (ap, enum tree_code);
3878 /* This signifies an ellipses, any further arguments are all ok. */
3882 /* This signifies an endlink, if no arguments remain, return
3883 true, otherwise return false. */
3885 return arglist == 0;
3887 /* If no parameters remain or the parameter's code does not
3888 match the specified code, return false. Otherwise continue
3889 checking any remaining arguments. */
3890 if (arglist == 0 || code != TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))))
3897 arglist = TREE_CHAIN (arglist);