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 = change_address (result, mode,
951 plus_constant (XEXP (result, 0), size));
952 savevec[nelts++] = (savep
953 ? gen_rtx_SET (VOIDmode, mem, reg)
954 : gen_rtx_SET (VOIDmode, reg, mem));
955 size += GET_MODE_SIZE (mode);
957 return gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (nelts, savevec));
959 #endif /* HAVE_untyped_call or HAVE_untyped_return */
961 /* Save the state required to perform an untyped call with the same
962 arguments as were passed to the current function. */
965 expand_builtin_apply_args_1 ()
968 int size, align, regno;
969 enum machine_mode mode;
971 /* Create a block where the arg-pointer, structure value address,
972 and argument registers can be saved. */
973 registers = assign_stack_local (BLKmode, apply_args_size (), -1);
975 /* Walk past the arg-pointer and structure value address. */
976 size = GET_MODE_SIZE (Pmode);
977 if (struct_value_rtx)
978 size += GET_MODE_SIZE (Pmode);
980 /* Save each register used in calling a function to the block. */
981 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
982 if ((mode = apply_args_mode[regno]) != VOIDmode)
986 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
987 if (size % align != 0)
988 size = CEIL (size, align) * align;
990 tem = gen_rtx_REG (mode, INCOMING_REGNO (regno));
992 emit_move_insn (change_address (registers, mode,
993 plus_constant (XEXP (registers, 0),
996 size += GET_MODE_SIZE (mode);
999 /* Save the arg pointer to the block. */
1000 emit_move_insn (change_address (registers, Pmode, XEXP (registers, 0)),
1001 copy_to_reg (virtual_incoming_args_rtx));
1002 size = GET_MODE_SIZE (Pmode);
1004 /* Save the structure value address unless this is passed as an
1005 "invisible" first argument. */
1006 if (struct_value_incoming_rtx)
1008 emit_move_insn (change_address (registers, Pmode,
1009 plus_constant (XEXP (registers, 0),
1011 copy_to_reg (struct_value_incoming_rtx));
1012 size += GET_MODE_SIZE (Pmode);
1015 /* Return the address of the block. */
1016 return copy_addr_to_reg (XEXP (registers, 0));
1019 /* __builtin_apply_args returns block of memory allocated on
1020 the stack into which is stored the arg pointer, structure
1021 value address, static chain, and all the registers that might
1022 possibly be used in performing a function call. The code is
1023 moved to the start of the function so the incoming values are
1026 expand_builtin_apply_args ()
1028 /* Don't do __builtin_apply_args more than once in a function.
1029 Save the result of the first call and reuse it. */
1030 if (apply_args_value != 0)
1031 return apply_args_value;
1033 /* When this function is called, it means that registers must be
1034 saved on entry to this function. So we migrate the
1035 call to the first insn of this function. */
1040 temp = expand_builtin_apply_args_1 ();
1044 apply_args_value = temp;
1046 /* Put the sequence after the NOTE that starts the function.
1047 If this is inside a SEQUENCE, make the outer-level insn
1048 chain current, so the code is placed at the start of the
1050 push_topmost_sequence ();
1051 emit_insns_before (seq, NEXT_INSN (get_insns ()));
1052 pop_topmost_sequence ();
1057 /* Perform an untyped call and save the state required to perform an
1058 untyped return of whatever value was returned by the given function. */
1061 expand_builtin_apply (function, arguments, argsize)
1062 rtx function, arguments, argsize;
1064 int size, align, regno;
1065 enum machine_mode mode;
1066 rtx incoming_args, result, reg, dest, call_insn;
1067 rtx old_stack_level = 0;
1068 rtx call_fusage = 0;
1070 /* Create a block where the return registers can be saved. */
1071 result = assign_stack_local (BLKmode, apply_result_size (), -1);
1073 /* Fetch the arg pointer from the ARGUMENTS block. */
1074 incoming_args = gen_reg_rtx (Pmode);
1075 emit_move_insn (incoming_args,
1076 gen_rtx_MEM (Pmode, arguments));
1077 #ifndef STACK_GROWS_DOWNWARD
1078 incoming_args = expand_binop (Pmode, sub_optab, incoming_args, argsize,
1079 incoming_args, 0, OPTAB_LIB_WIDEN);
1082 /* Perform postincrements before actually calling the function. */
1085 /* Push a new argument block and copy the arguments. Do not allow
1086 the (potential) memcpy call below to interfere with our stack
1088 do_pending_stack_adjust ();
1091 /* Save the stack with nonlocal if available */
1092 #ifdef HAVE_save_stack_nonlocal
1093 if (HAVE_save_stack_nonlocal)
1094 emit_stack_save (SAVE_NONLOCAL, &old_stack_level, NULL_RTX);
1097 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
1099 /* Push a block of memory onto the stack to store the memory arguments.
1100 Save the address in a register, and copy the memory arguments. ??? I
1101 haven't figured out how the calling convention macros effect this,
1102 but it's likely that the source and/or destination addresses in
1103 the block copy will need updating in machine specific ways. */
1104 dest = allocate_dynamic_stack_space (argsize, 0, BITS_PER_UNIT);
1105 emit_block_move (gen_rtx_MEM (BLKmode, dest),
1106 gen_rtx_MEM (BLKmode, incoming_args),
1107 argsize, PARM_BOUNDARY);
1109 /* Refer to the argument block. */
1111 arguments = gen_rtx_MEM (BLKmode, arguments);
1113 /* Walk past the arg-pointer and structure value address. */
1114 size = GET_MODE_SIZE (Pmode);
1115 if (struct_value_rtx)
1116 size += GET_MODE_SIZE (Pmode);
1118 /* Restore each of the registers previously saved. Make USE insns
1119 for each of these registers for use in making the call. */
1120 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1121 if ((mode = apply_args_mode[regno]) != VOIDmode)
1123 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1124 if (size % align != 0)
1125 size = CEIL (size, align) * align;
1126 reg = gen_rtx_REG (mode, regno);
1127 emit_move_insn (reg,
1128 change_address (arguments, mode,
1129 plus_constant (XEXP (arguments, 0),
1132 use_reg (&call_fusage, reg);
1133 size += GET_MODE_SIZE (mode);
1136 /* Restore the structure value address unless this is passed as an
1137 "invisible" first argument. */
1138 size = GET_MODE_SIZE (Pmode);
1139 if (struct_value_rtx)
1141 rtx value = gen_reg_rtx (Pmode);
1142 emit_move_insn (value,
1143 change_address (arguments, Pmode,
1144 plus_constant (XEXP (arguments, 0),
1146 emit_move_insn (struct_value_rtx, value);
1147 if (GET_CODE (struct_value_rtx) == REG)
1148 use_reg (&call_fusage, struct_value_rtx);
1149 size += GET_MODE_SIZE (Pmode);
1152 /* All arguments and registers used for the call are set up by now! */
1153 function = prepare_call_address (function, NULL_TREE, &call_fusage, 0);
1155 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
1156 and we don't want to load it into a register as an optimization,
1157 because prepare_call_address already did it if it should be done. */
1158 if (GET_CODE (function) != SYMBOL_REF)
1159 function = memory_address (FUNCTION_MODE, function);
1161 /* Generate the actual call instruction and save the return value. */
1162 #ifdef HAVE_untyped_call
1163 if (HAVE_untyped_call)
1164 emit_call_insn (gen_untyped_call (gen_rtx_MEM (FUNCTION_MODE, function),
1165 result, result_vector (1, result)));
1168 #ifdef HAVE_call_value
1169 if (HAVE_call_value)
1173 /* Locate the unique return register. It is not possible to
1174 express a call that sets more than one return register using
1175 call_value; use untyped_call for that. In fact, untyped_call
1176 only needs to save the return registers in the given block. */
1177 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1178 if ((mode = apply_result_mode[regno]) != VOIDmode)
1181 abort (); /* HAVE_untyped_call required. */
1182 valreg = gen_rtx_REG (mode, regno);
1185 emit_call_insn (GEN_CALL_VALUE (valreg,
1186 gen_rtx_MEM (FUNCTION_MODE, function),
1187 const0_rtx, NULL_RTX, const0_rtx));
1189 emit_move_insn (change_address (result, GET_MODE (valreg),
1197 /* Find the CALL insn we just emitted. */
1198 for (call_insn = get_last_insn ();
1199 call_insn && GET_CODE (call_insn) != CALL_INSN;
1200 call_insn = PREV_INSN (call_insn))
1206 /* Put the register usage information on the CALL. If there is already
1207 some usage information, put ours at the end. */
1208 if (CALL_INSN_FUNCTION_USAGE (call_insn))
1212 for (link = CALL_INSN_FUNCTION_USAGE (call_insn); XEXP (link, 1) != 0;
1213 link = XEXP (link, 1))
1216 XEXP (link, 1) = call_fusage;
1219 CALL_INSN_FUNCTION_USAGE (call_insn) = call_fusage;
1221 /* Restore the stack. */
1222 #ifdef HAVE_save_stack_nonlocal
1223 if (HAVE_save_stack_nonlocal)
1224 emit_stack_restore (SAVE_NONLOCAL, old_stack_level, NULL_RTX);
1227 emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX);
1231 /* Return the address of the result block. */
1232 return copy_addr_to_reg (XEXP (result, 0));
1235 /* Perform an untyped return. */
1238 expand_builtin_return (result)
1241 int size, align, regno;
1242 enum machine_mode mode;
1244 rtx call_fusage = 0;
1246 apply_result_size ();
1247 result = gen_rtx_MEM (BLKmode, result);
1249 #ifdef HAVE_untyped_return
1250 if (HAVE_untyped_return)
1252 emit_jump_insn (gen_untyped_return (result, result_vector (0, result)));
1258 /* Restore the return value and note that each value is used. */
1260 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1261 if ((mode = apply_result_mode[regno]) != VOIDmode)
1263 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1264 if (size % align != 0)
1265 size = CEIL (size, align) * align;
1266 reg = gen_rtx_REG (mode, INCOMING_REGNO (regno));
1267 emit_move_insn (reg,
1268 change_address (result, mode,
1269 plus_constant (XEXP (result, 0),
1272 push_to_sequence (call_fusage);
1273 emit_insn (gen_rtx_USE (VOIDmode, reg));
1274 call_fusage = get_insns ();
1276 size += GET_MODE_SIZE (mode);
1279 /* Put the USE insns before the return. */
1280 emit_insns (call_fusage);
1282 /* Return whatever values was restored by jumping directly to the end
1284 expand_null_return ();
1287 /* Expand a call to __builtin_classify_type with arguments found in
1290 expand_builtin_classify_type (arglist)
1295 tree type = TREE_TYPE (TREE_VALUE (arglist));
1296 enum tree_code code = TREE_CODE (type);
1297 if (code == VOID_TYPE)
1298 return GEN_INT (void_type_class);
1299 if (code == INTEGER_TYPE)
1300 return GEN_INT (integer_type_class);
1301 if (code == CHAR_TYPE)
1302 return GEN_INT (char_type_class);
1303 if (code == ENUMERAL_TYPE)
1304 return GEN_INT (enumeral_type_class);
1305 if (code == BOOLEAN_TYPE)
1306 return GEN_INT (boolean_type_class);
1307 if (code == POINTER_TYPE)
1308 return GEN_INT (pointer_type_class);
1309 if (code == REFERENCE_TYPE)
1310 return GEN_INT (reference_type_class);
1311 if (code == OFFSET_TYPE)
1312 return GEN_INT (offset_type_class);
1313 if (code == REAL_TYPE)
1314 return GEN_INT (real_type_class);
1315 if (code == COMPLEX_TYPE)
1316 return GEN_INT (complex_type_class);
1317 if (code == FUNCTION_TYPE)
1318 return GEN_INT (function_type_class);
1319 if (code == METHOD_TYPE)
1320 return GEN_INT (method_type_class);
1321 if (code == RECORD_TYPE)
1322 return GEN_INT (record_type_class);
1323 if (code == UNION_TYPE || code == QUAL_UNION_TYPE)
1324 return GEN_INT (union_type_class);
1325 if (code == ARRAY_TYPE)
1327 if (TYPE_STRING_FLAG (type))
1328 return GEN_INT (string_type_class);
1330 return GEN_INT (array_type_class);
1332 if (code == SET_TYPE)
1333 return GEN_INT (set_type_class);
1334 if (code == FILE_TYPE)
1335 return GEN_INT (file_type_class);
1336 if (code == LANG_TYPE)
1337 return GEN_INT (lang_type_class);
1339 return GEN_INT (no_type_class);
1342 /* Expand expression EXP, which is a call to __builtin_constant_p. */
1344 expand_builtin_constant_p (exp)
1347 tree arglist = TREE_OPERAND (exp, 1);
1348 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1353 arglist = TREE_VALUE (arglist);
1355 /* We have taken care of the easy cases during constant folding. This
1356 case is not obvious, so emit (constant_p_rtx (ARGLIST)) and let CSE get a
1357 chance to see if it can deduce whether ARGLIST is constant. */
1359 tmp = expand_expr (arglist, NULL_RTX, VOIDmode, 0);
1360 tmp = gen_rtx_CONSTANT_P_RTX (value_mode, tmp);
1364 /* Expand a call to one of the builtin math functions (sin, cos, or sqrt).
1365 Return 0 if a normal call should be emitted rather than expanding the
1366 function in-line. EXP is the expression that is a call to the builtin
1367 function; if convenient, the result should be placed in TARGET.
1368 SUBTARGET may be used as the target for computing one of EXP's operands. */
1370 expand_builtin_mathfn (exp, target, subtarget)
1372 rtx target, subtarget;
1374 optab builtin_optab;
1376 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
1377 tree arglist = TREE_OPERAND (exp, 1);
1379 if (!validate_arglist (arglist, REAL_TYPE, VOID_TYPE))
1382 /* Stabilize and compute the argument. */
1383 if (TREE_CODE (TREE_VALUE (arglist)) != VAR_DECL
1384 && TREE_CODE (TREE_VALUE (arglist)) != PARM_DECL)
1386 exp = copy_node (exp);
1387 TREE_OPERAND (exp, 1) = arglist;
1388 /* Wrap the computation of the argument in a SAVE_EXPR. That
1389 way, if we need to expand the argument again (as in the
1390 flag_errno_math case below where we cannot directly set
1391 errno), we will not perform side-effects more than once.
1392 Note that here we're mutating the original EXP as well as the
1393 copy; that's the right thing to do in case the original EXP
1394 is expanded later. */
1395 TREE_VALUE (arglist) = save_expr (TREE_VALUE (arglist));
1396 arglist = copy_node (arglist);
1398 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
1400 /* Make a suitable register to place result in. */
1401 target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));
1406 switch (DECL_FUNCTION_CODE (fndecl))
1411 builtin_optab = sin_optab; break;
1415 builtin_optab = cos_optab; break;
1416 case BUILT_IN_FSQRT:
1417 case BUILT_IN_SQRTF:
1418 case BUILT_IN_SQRTL:
1419 builtin_optab = sqrt_optab; break;
1424 /* Compute into TARGET.
1425 Set TARGET to wherever the result comes back. */
1426 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
1427 builtin_optab, op0, target, 0);
1429 /* If we were unable to expand via the builtin, stop the
1430 sequence (without outputting the insns) and return 0, causing
1431 a call to the library function. */
1438 /* If errno must be maintained and if we are not allowing unsafe
1439 math optimizations, check the result. */
1441 if (flag_errno_math && ! flag_unsafe_math_optimizations)
1445 /* Don't define the builtin FP instructions
1446 if your machine is not IEEE. */
1447 if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT)
1450 lab1 = gen_label_rtx ();
1452 /* Test the result; if it is NaN, set errno=EDOM because
1453 the argument was not in the domain. */
1454 emit_cmp_and_jump_insns (target, target, EQ, 0, GET_MODE (target),
1459 #ifdef GEN_ERRNO_RTX
1460 rtx errno_rtx = GEN_ERRNO_RTX;
1463 = gen_rtx_MEM (word_mode, gen_rtx_SYMBOL_REF (Pmode, "errno"));
1466 emit_move_insn (errno_rtx, GEN_INT (TARGET_EDOM));
1469 /* We can't set errno=EDOM directly; let the library call do it.
1470 Pop the arguments right away in case the call gets deleted. */
1472 expand_call (exp, target, 0);
1479 /* Output the entire sequence. */
1480 insns = get_insns ();
1487 /* Expand expression EXP which is a call to the strlen builtin. Return 0
1488 if we failed the caller should emit a normal call, otherwise
1489 try to get the result in TARGET, if convenient. */
1492 expand_builtin_strlen (exp, target)
1496 tree arglist = TREE_OPERAND (exp, 1);
1497 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1499 if (!validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
1504 tree src = TREE_VALUE (arglist);
1507 = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1509 rtx result, src_reg, char_rtx, before_strlen;
1510 enum machine_mode insn_mode = value_mode, char_mode;
1511 enum insn_code icode = CODE_FOR_nothing;
1513 /* If SRC is not a pointer type, don't do this operation inline. */
1517 /* Bail out if we can't compute strlen in the right mode. */
1518 while (insn_mode != VOIDmode)
1520 icode = strlen_optab->handlers[(int) insn_mode].insn_code;
1521 if (icode != CODE_FOR_nothing)
1524 insn_mode = GET_MODE_WIDER_MODE (insn_mode);
1526 if (insn_mode == VOIDmode)
1529 /* Make a place to write the result of the instruction. */
1532 && GET_CODE (result) == REG
1533 && GET_MODE (result) == insn_mode
1534 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
1535 result = gen_reg_rtx (insn_mode);
1537 /* Make a place to hold the source address. We will not expand
1538 the actual source until we are sure that the expansion will
1539 not fail -- there are trees that cannot be expanded twice. */
1540 src_reg = gen_reg_rtx (Pmode);
1542 /* Mark the beginning of the strlen sequence so we can emit the
1543 source operand later. */
1544 before_strlen = get_last_insn();
1546 /* Check the string is readable and has an end. */
1547 if (current_function_check_memory_usage)
1548 emit_library_call (chkr_check_str_libfunc, LCT_CONST_MAKE_BLOCK,
1549 VOIDmode, 2, src_reg, Pmode,
1550 GEN_INT (MEMORY_USE_RO),
1551 TYPE_MODE (integer_type_node));
1553 char_rtx = const0_rtx;
1554 char_mode = insn_data[(int) icode].operand[2].mode;
1555 if (! (*insn_data[(int) icode].operand[2].predicate) (char_rtx,
1557 char_rtx = copy_to_mode_reg (char_mode, char_rtx);
1559 pat = GEN_FCN (icode) (result, gen_rtx_MEM (BLKmode, src_reg),
1560 char_rtx, GEN_INT (align));
1565 /* Now that we are assured of success, expand the source. */
1567 pat = memory_address (BLKmode,
1568 expand_expr (src, src_reg, ptr_mode, EXPAND_SUM));
1570 emit_move_insn (src_reg, pat);
1571 pat = gen_sequence ();
1575 emit_insn_after (pat, before_strlen);
1577 emit_insn_before (pat, get_insns ());
1579 /* Return the value in the proper mode for this function. */
1580 if (GET_MODE (result) == value_mode)
1582 else if (target != 0)
1583 convert_move (target, result, 0);
1585 target = convert_to_mode (value_mode, result, 0);
1591 /* Expand a call to the strstr builtin. Return 0 if we failed the
1592 caller should emit a normal call, otherwise try to get the result
1593 in TARGET, if convenient (and in mode MODE if that's convenient). */
1596 expand_builtin_strstr (arglist, target, mode)
1599 enum machine_mode mode;
1601 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
1602 || current_function_check_memory_usage)
1606 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1608 const char *p1, *p2;
1617 const char *r = strstr (p1, p2);
1622 /* Return an offset into the constant string argument. */
1623 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1624 s1, ssize_int (r - p1))),
1625 target, mode, EXPAND_NORMAL);
1629 return expand_expr (s1, target, mode, EXPAND_NORMAL);
1634 fn = built_in_decls[BUILT_IN_STRCHR];
1638 /* New argument list transforming strstr(s1, s2) to
1639 strchr(s1, s2[0]). */
1641 build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
1642 arglist = tree_cons (NULL_TREE, s1, arglist);
1643 return expand_expr (build_function_call_expr (fn, arglist),
1644 target, mode, EXPAND_NORMAL);
1648 /* Expand a call to the strchr builtin. Return 0 if we failed the
1649 caller should emit a normal call, otherwise try to get the result
1650 in TARGET, if convenient (and in mode MODE if that's convenient). */
1653 expand_builtin_strchr (arglist, target, mode)
1656 enum machine_mode mode;
1658 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
1659 || current_function_check_memory_usage)
1663 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1666 if (TREE_CODE (s2) != INTEGER_CST)
1675 if (target_char_cast (s2, &c))
1683 /* Return an offset into the constant string argument. */
1684 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1685 s1, ssize_int (r - p1))),
1686 target, mode, EXPAND_NORMAL);
1689 /* FIXME: Should use here strchrM optab so that ports can optimize
1695 /* Expand a call to the strrchr builtin. Return 0 if we failed the
1696 caller should emit a normal call, otherwise try to get the result
1697 in TARGET, if convenient (and in mode MODE if that's convenient). */
1700 expand_builtin_strrchr (arglist, target, mode)
1703 enum machine_mode mode;
1705 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
1706 || current_function_check_memory_usage)
1710 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1714 if (TREE_CODE (s2) != INTEGER_CST)
1723 if (target_char_cast (s2, &c))
1726 r = strrchr (p1, c);
1731 /* Return an offset into the constant string argument. */
1732 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1733 s1, ssize_int (r - p1))),
1734 target, mode, EXPAND_NORMAL);
1737 if (! integer_zerop (s2))
1740 fn = built_in_decls[BUILT_IN_STRCHR];
1744 /* Transform strrchr(s1, '\0') to strchr(s1, '\0'). */
1745 return expand_expr (build_function_call_expr (fn, arglist),
1746 target, mode, EXPAND_NORMAL);
1750 /* Expand a call to the strpbrk builtin. Return 0 if we failed the
1751 caller should emit a normal call, otherwise try to get the result
1752 in TARGET, if convenient (and in mode MODE if that's convenient). */
1755 expand_builtin_strpbrk (arglist, target, mode)
1758 enum machine_mode mode;
1760 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
1761 || current_function_check_memory_usage)
1765 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1767 const char *p1, *p2;
1776 const char *r = strpbrk (p1, p2);
1781 /* Return an offset into the constant string argument. */
1782 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1783 s1, ssize_int (r - p1))),
1784 target, mode, EXPAND_NORMAL);
1789 /* strpbrk(x, "") == NULL.
1790 Evaluate and ignore the arguments in case they had
1792 expand_expr (s1, const0_rtx, VOIDmode, EXPAND_NORMAL);
1797 return 0; /* Really call strpbrk. */
1799 fn = built_in_decls[BUILT_IN_STRCHR];
1803 /* New argument list transforming strpbrk(s1, s2) to
1804 strchr(s1, s2[0]). */
1806 build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
1807 arglist = tree_cons (NULL_TREE, s1, arglist);
1808 return expand_expr (build_function_call_expr (fn, arglist),
1809 target, mode, EXPAND_NORMAL);
1813 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1814 bytes from constant string DATA + OFFSET and return it as target
1818 builtin_memcpy_read_str (data, offset, mode)
1820 HOST_WIDE_INT offset;
1821 enum machine_mode mode;
1823 const char *str = (const char *) data;
1825 if (offset + GET_MODE_SIZE (mode) > strlen (str) + 1)
1826 abort (); /* Attempt to read past the end of constant string. */
1828 return c_readstr (str + offset, mode);
1831 /* Expand a call to the memcpy builtin, with arguments in ARGLIST. */
1833 expand_builtin_memcpy (arglist)
1836 if (!validate_arglist (arglist,
1837 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
1841 tree dest = TREE_VALUE (arglist);
1842 tree src = TREE_VALUE (TREE_CHAIN (arglist));
1843 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1844 const char *src_str;
1846 int src_align = get_pointer_alignment (src, BIGGEST_ALIGNMENT);
1847 int dest_align = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
1848 rtx dest_mem, src_mem, dest_addr, len_rtx;
1850 /* If either SRC or DEST is not a pointer type, don't do
1851 this operation in-line. */
1852 if (src_align == 0 || dest_align == 0)
1855 dest_mem = get_memory_rtx (dest);
1856 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
1857 src_str = c_getstr (src);
1859 /* If SRC is a string constant and block move would be done
1860 by pieces, we can avoid loading the string from memory
1861 and only stored the computed constants. */
1863 && !current_function_check_memory_usage
1864 && GET_CODE (len_rtx) == CONST_INT
1865 && (unsigned HOST_WIDE_INT) INTVAL (len_rtx) <= strlen (src_str) + 1
1866 && can_store_by_pieces (INTVAL (len_rtx), builtin_memcpy_read_str,
1867 (PTR) src_str, dest_align))
1869 store_by_pieces (dest_mem, INTVAL (len_rtx),
1870 builtin_memcpy_read_str,
1871 (PTR) src_str, dest_align);
1872 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
1875 src_mem = get_memory_rtx (src);
1877 /* Just copy the rights of SRC to the rights of DEST. */
1878 if (current_function_check_memory_usage)
1879 emit_library_call (chkr_copy_bitmap_libfunc, LCT_CONST_MAKE_BLOCK,
1880 VOIDmode, 3, XEXP (dest_mem, 0), Pmode,
1881 XEXP (src_mem, 0), Pmode,
1882 len_rtx, TYPE_MODE (sizetype));
1884 /* Copy word part most expediently. */
1886 = emit_block_move (dest_mem, src_mem, len_rtx,
1887 MIN (src_align, dest_align));
1890 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
1896 /* Expand expression EXP, which is a call to the strcpy builtin. Return 0
1897 if we failed the caller should emit a normal call. */
1900 expand_builtin_strcpy (exp)
1903 tree arglist = TREE_OPERAND (exp, 1);
1906 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
1910 tree len = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
1915 len = size_binop (PLUS_EXPR, len, ssize_int (1));
1916 chainon (arglist, build_tree_list (NULL_TREE, len));
1919 result = expand_builtin_memcpy (arglist);
1922 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
1926 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1927 bytes from constant string DATA + OFFSET and return it as target
1931 builtin_strncpy_read_str (data, offset, mode)
1933 HOST_WIDE_INT offset;
1934 enum machine_mode mode;
1936 const char *str = (const char *) data;
1938 if ((unsigned HOST_WIDE_INT) offset > strlen (str))
1941 return c_readstr (str + offset, mode);
1944 /* Expand expression EXP, which is a call to the strncpy builtin. Return 0
1945 if we failed the caller should emit a normal call. */
1948 expand_builtin_strncpy (arglist, target, mode)
1951 enum machine_mode mode;
1953 if (!validate_arglist (arglist,
1954 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
1958 tree slen = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
1959 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1961 /* We must be passed a constant len parameter. */
1962 if (TREE_CODE (len) != INTEGER_CST)
1965 /* If the len parameter is zero, return the dst parameter. */
1966 if (compare_tree_int (len, 0) == 0)
1968 /* Evaluate and ignore the src argument in case it has
1970 expand_expr (TREE_VALUE (TREE_CHAIN (arglist)), const0_rtx,
1971 VOIDmode, EXPAND_NORMAL);
1972 /* Return the dst parameter. */
1973 return expand_expr (TREE_VALUE (arglist), target, mode,
1977 /* Now, we must be passed a constant src ptr parameter. */
1978 if (slen == 0 || TREE_CODE (slen) != INTEGER_CST)
1981 slen = size_binop (PLUS_EXPR, slen, ssize_int (1));
1983 /* We're required to pad with trailing zeros if the requested
1984 len is greater than strlen(s2)+1. In that case try to
1985 use store_by_pieces, if it fails, punt. */
1986 if (tree_int_cst_lt (slen, len))
1988 tree dest = TREE_VALUE (arglist);
1989 int dest_align = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
1990 const char *p = c_getstr (TREE_VALUE (TREE_CHAIN (arglist)));
1993 if (!p || !dest_align || TREE_INT_CST_HIGH (len)
1994 || !can_store_by_pieces (TREE_INT_CST_LOW (len),
1995 builtin_strncpy_read_str,
1996 (PTR) p, dest_align))
1999 dest_mem = get_memory_rtx (dest);
2000 store_by_pieces (dest_mem, TREE_INT_CST_LOW (len),
2001 builtin_strncpy_read_str,
2002 (PTR) p, dest_align);
2003 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
2006 /* OK transform into builtin memcpy. */
2007 return expand_builtin_memcpy (arglist);
2011 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
2012 bytes from constant string DATA + OFFSET and return it as target
2016 builtin_memset_read_str (data, offset, mode)
2018 HOST_WIDE_INT offset ATTRIBUTE_UNUSED;
2019 enum machine_mode mode;
2021 const char *c = (const char *) data;
2022 char *p = alloca (GET_MODE_SIZE (mode));
2024 memset (p, *c, GET_MODE_SIZE (mode));
2026 return c_readstr (p, mode);
2029 /* Expand expression EXP, which is a call to the memset builtin. Return 0
2030 if we failed the caller should emit a normal call. */
2033 expand_builtin_memset (exp)
2036 tree arglist = TREE_OPERAND (exp, 1);
2038 if (!validate_arglist (arglist,
2039 POINTER_TYPE, INTEGER_TYPE, INTEGER_TYPE, VOID_TYPE))
2043 tree dest = TREE_VALUE (arglist);
2044 tree val = TREE_VALUE (TREE_CHAIN (arglist));
2045 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2048 int dest_align = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
2049 rtx dest_mem, dest_addr, len_rtx;
2051 /* If DEST is not a pointer type, don't do this
2052 operation in-line. */
2053 if (dest_align == 0)
2056 if (TREE_CODE (val) != INTEGER_CST)
2059 if (target_char_cast (val, &c))
2064 if (TREE_CODE (len) != INTEGER_CST || TREE_INT_CST_HIGH (len))
2066 if (current_function_check_memory_usage
2067 || !can_store_by_pieces (TREE_INT_CST_LOW (len),
2068 builtin_memset_read_str,
2069 (PTR) &c, dest_align))
2072 dest_mem = get_memory_rtx (dest);
2073 store_by_pieces (dest_mem, TREE_INT_CST_LOW (len),
2074 builtin_memset_read_str,
2075 (PTR) &c, dest_align);
2076 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
2079 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
2081 dest_mem = get_memory_rtx (dest);
2083 /* Just check DST is writable and mark it as readable. */
2084 if (current_function_check_memory_usage)
2085 emit_library_call (chkr_check_addr_libfunc, LCT_CONST_MAKE_BLOCK,
2086 VOIDmode, 3, XEXP (dest_mem, 0), Pmode,
2087 len_rtx, TYPE_MODE (sizetype),
2088 GEN_INT (MEMORY_USE_WO),
2089 TYPE_MODE (integer_type_node));
2092 dest_addr = clear_storage (dest_mem, len_rtx, dest_align);
2095 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
2101 /* Expand expression EXP, which is a call to the bzero builtin. Return 0
2102 if we failed the caller should emit a normal call. */
2104 expand_builtin_bzero (exp)
2107 tree arglist = TREE_OPERAND (exp, 1);
2108 tree dest, size, newarglist;
2111 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2114 dest = TREE_VALUE (arglist);
2115 size = TREE_VALUE (TREE_CHAIN (arglist));
2117 /* New argument list transforming bzero(ptr x, int y) to
2118 memset(ptr x, int 0, size_t y). */
2120 newarglist = build_tree_list (NULL_TREE, convert (sizetype, size));
2121 newarglist = tree_cons (NULL_TREE, integer_zero_node, newarglist);
2122 newarglist = tree_cons (NULL_TREE, dest, newarglist);
2124 TREE_OPERAND (exp, 1) = newarglist;
2125 result = expand_builtin_memset(exp);
2127 /* Always restore the original arguments. */
2128 TREE_OPERAND (exp, 1) = arglist;
2133 #ifdef HAVE_cmpstrsi
2134 /* Expand expression EXP, which is a call to the memcmp or the strcmp builtin.
2135 ARGLIST is the argument list for this call. Return 0 if we failed and the
2136 caller should emit a normal call, otherwise try to get the result in
2137 TARGET, if convenient. */
2139 expand_builtin_memcmp (exp, arglist, target)
2144 /* If we need to check memory accesses, call the library function. */
2145 if (current_function_check_memory_usage)
2148 if (!validate_arglist (arglist,
2149 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2153 enum machine_mode mode;
2154 tree arg1 = TREE_VALUE (arglist);
2155 tree arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2156 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2157 rtx arg1_rtx, arg2_rtx, arg3_rtx;
2162 = get_pointer_alignment (arg1, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
2164 = get_pointer_alignment (arg2, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
2165 enum machine_mode insn_mode
2166 = insn_data[(int) CODE_FOR_cmpstrsi].operand[0].mode;
2168 /* If we don't have POINTER_TYPE, call the function. */
2169 if (arg1_align == 0 || arg2_align == 0)
2172 /* Make a place to write the result of the instruction. */
2175 && GET_CODE (result) == REG && GET_MODE (result) == insn_mode
2176 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
2177 result = gen_reg_rtx (insn_mode);
2179 arg1_rtx = get_memory_rtx (arg1);
2180 arg2_rtx = get_memory_rtx (arg2);
2181 arg3_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
2185 insn = gen_cmpstrsi (result, arg1_rtx, arg2_rtx, arg3_rtx,
2186 GEN_INT (MIN (arg1_align, arg2_align)));
2191 emit_library_call_value (memcmp_libfunc, result, LCT_PURE_MAKE_BLOCK,
2192 TYPE_MODE (integer_type_node), 3,
2193 XEXP (arg1_rtx, 0), Pmode,
2194 XEXP (arg2_rtx, 0), Pmode,
2195 convert_to_mode (TYPE_MODE (sizetype), arg3_rtx,
2196 TREE_UNSIGNED (sizetype)),
2197 TYPE_MODE (sizetype));
2199 /* Return the value in the proper mode for this function. */
2200 mode = TYPE_MODE (TREE_TYPE (exp));
2201 if (GET_MODE (result) == mode)
2203 else if (target != 0)
2205 convert_move (target, result, 0);
2209 return convert_to_mode (mode, result, 0);
2214 /* Expand expression EXP, which is a call to the strcmp builtin. Return 0
2215 if we failed the caller should emit a normal call, otherwise try to get
2216 the result in TARGET, if convenient. */
2219 expand_builtin_strcmp (exp, target, mode)
2222 enum machine_mode mode;
2224 tree arglist = TREE_OPERAND (exp, 1);
2226 const char *p1, *p2;
2228 /* If we need to check memory accesses, call the library function. */
2229 if (current_function_check_memory_usage)
2232 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2235 arg1 = TREE_VALUE (arglist);
2236 arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2238 p1 = c_getstr (arg1);
2239 p2 = c_getstr (arg2);
2243 const int i = strcmp (p1, p2);
2244 return (i < 0 ? constm1_rtx : (i > 0 ? const1_rtx : const0_rtx));
2247 /* If either arg is "", return an expression corresponding to
2248 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
2249 if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
2251 tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
2252 tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
2254 fold (build1 (CONVERT_EXPR, integer_type_node,
2255 build1 (INDIRECT_REF, cst_uchar_node,
2256 build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
2258 fold (build1 (CONVERT_EXPR, integer_type_node,
2259 build1 (INDIRECT_REF, cst_uchar_node,
2260 build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
2261 tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
2262 return expand_expr (result, target, mode, EXPAND_NORMAL);
2265 #ifdef HAVE_cmpstrsi
2266 if (! HAVE_cmpstrsi)
2270 tree len = c_strlen (arg1);
2271 tree len2 = c_strlen (arg2);
2275 len = size_binop (PLUS_EXPR, ssize_int (1), len);
2278 len2 = size_binop (PLUS_EXPR, ssize_int (1), len2);
2280 /* If we don't have a constant length for the first, use the length
2281 of the second, if we know it. We don't require a constant for
2282 this case; some cost analysis could be done if both are available
2283 but neither is constant. For now, assume they're equally cheap
2284 unless one has side effects.
2286 If both strings have constant lengths, use the smaller. This
2287 could arise if optimization results in strcpy being called with
2288 two fixed strings, or if the code was machine-generated. We should
2289 add some code to the `memcmp' handler below to deal with such
2290 situations, someday. */
2292 if (!len || TREE_CODE (len) != INTEGER_CST)
2294 if (len2 && !TREE_SIDE_EFFECTS (len2))
2299 else if (len2 && TREE_CODE (len2) == INTEGER_CST
2300 && tree_int_cst_lt (len2, len))
2303 /* If both arguments have side effects, we cannot optimize. */
2304 if (TREE_SIDE_EFFECTS (len))
2307 chainon (arglist, build_tree_list (NULL_TREE, len));
2308 result = expand_builtin_memcmp (exp, arglist, target);
2310 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
2319 /* Expand expression EXP, which is a call to the strncmp builtin. Return 0
2320 if we failed the caller should emit a normal call, otherwise try to get
2321 the result in TARGET, if convenient. */
2323 expand_builtin_strncmp (exp, target, mode)
2326 enum machine_mode mode;
2328 tree arglist = TREE_OPERAND (exp, 1);
2329 tree arg1, arg2, arg3;
2330 const char *p1, *p2;
2332 /* If we need to check memory accesses, call the library function. */
2333 if (current_function_check_memory_usage)
2336 if (!validate_arglist (arglist,
2337 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2340 arg1 = TREE_VALUE (arglist);
2341 arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2342 arg3 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2344 /* If the len parameter is zero, return zero. */
2345 if (host_integerp (arg3, 1) && tree_low_cst (arg3, 1) == 0)
2347 /* Evaluate and ignore arg1 and arg2 in case they have
2349 expand_expr (arg1, const0_rtx, VOIDmode, EXPAND_NORMAL);
2350 expand_expr (arg2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2354 p1 = c_getstr (arg1);
2355 p2 = c_getstr (arg2);
2357 /* If all arguments are constant, evaluate at compile-time. */
2358 if (host_integerp (arg3, 1) && p1 && p2)
2360 const int r = strncmp (p1, p2, tree_low_cst (arg3, 1));
2361 return (r < 0 ? constm1_rtx : (r > 0 ? const1_rtx : const0_rtx));
2364 /* If len == 1 or (either string parameter is "" and (len >= 1)),
2365 return (*(const u_char*)arg1 - *(const u_char*)arg2). */
2366 if (host_integerp (arg3, 1)
2367 && (tree_low_cst (arg3, 1) == 1
2368 || (tree_low_cst (arg3, 1) > 1
2369 && ((p1 && *p1 == '\0') || (p2 && *p2 == '\0')))))
2371 tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
2372 tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
2374 fold (build1 (CONVERT_EXPR, integer_type_node,
2375 build1 (INDIRECT_REF, cst_uchar_node,
2376 build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
2378 fold (build1 (CONVERT_EXPR, integer_type_node,
2379 build1 (INDIRECT_REF, cst_uchar_node,
2380 build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
2381 tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
2382 return expand_expr (result, target, mode, EXPAND_NORMAL);
2385 #ifdef HAVE_cmpstrsi
2386 /* If c_strlen can determine an expression for one of the string
2387 lengths, and it doesn't have side effects, then call
2388 expand_builtin_memcmp() using length MIN(strlen(string)+1, arg3). */
2391 tree newarglist, len = 0;
2393 /* Perhaps one of the strings is really constant, if so prefer
2394 that constant length over the other string's length. */
2396 len = c_strlen (arg1);
2398 len = c_strlen (arg2);
2400 /* If we still don't have a len, try either string arg as long
2401 as they don't have side effects. */
2402 if (!len && !TREE_SIDE_EFFECTS (arg1))
2403 len = c_strlen (arg1);
2404 if (!len && !TREE_SIDE_EFFECTS (arg2))
2405 len = c_strlen (arg2);
2406 /* If we still don't have a length, punt. */
2410 /* Add one to the string length. */
2411 len = fold (size_binop (PLUS_EXPR, len, ssize_int (1)));
2413 /* The actual new length parameter is MIN(len,arg3). */
2414 len = fold (build (MIN_EXPR, TREE_TYPE (len), len, arg3));
2416 newarglist = build_tree_list (NULL_TREE, len);
2417 newarglist = tree_cons (NULL_TREE, arg2, newarglist);
2418 newarglist = tree_cons (NULL_TREE, arg1, newarglist);
2419 return expand_builtin_memcmp (exp, newarglist, target);
2426 /* Expand expression EXP, which is a call to the strcat builtin.
2427 Return 0 if we failed the caller should emit a normal call,
2428 otherwise try to get the result in TARGET, if convenient. */
2430 expand_builtin_strcat (arglist, target, mode)
2433 enum machine_mode mode;
2435 /* If we need to check memory accesses, call the library function. */
2436 if (current_function_check_memory_usage)
2439 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2443 tree dst = TREE_VALUE (arglist),
2444 src = TREE_VALUE (TREE_CHAIN (arglist));
2445 const char *p = c_getstr (src);
2447 /* If the string length is zero, return the dst parameter. */
2448 if (p && *p == '\0')
2449 return expand_expr (dst, target, mode, EXPAND_NORMAL);
2455 /* Expand expression EXP, which is a call to the strncat builtin.
2456 Return 0 if we failed the caller should emit a normal call,
2457 otherwise try to get the result in TARGET, if convenient. */
2459 expand_builtin_strncat (arglist, target, mode)
2462 enum machine_mode mode;
2464 /* If we need to check memory accesses, call the library function. */
2465 if (current_function_check_memory_usage)
2468 if (!validate_arglist (arglist,
2469 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2473 tree dst = TREE_VALUE (arglist),
2474 src = TREE_VALUE (TREE_CHAIN (arglist)),
2475 len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2476 const char *p = c_getstr (src);
2478 /* If the requested length is zero, or the src parameter string
2479 length is zero, return the dst parameter. */
2480 if ((TREE_CODE (len) == INTEGER_CST && compare_tree_int (len, 0) == 0)
2481 || (p && *p == '\0'))
2483 /* Evaluate and ignore the src and len parameters in case
2484 they have side-effects. */
2485 expand_expr (src, const0_rtx, VOIDmode, EXPAND_NORMAL);
2486 expand_expr (len, const0_rtx, VOIDmode, EXPAND_NORMAL);
2487 return expand_expr (dst, target, mode, EXPAND_NORMAL);
2490 /* If the requested len is greater than or equal to the string
2491 length, call strcat. */
2492 if (TREE_CODE (len) == INTEGER_CST && p
2493 && compare_tree_int (len, strlen (p)) >= 0)
2496 tree_cons (NULL_TREE, dst, build_tree_list (NULL_TREE, src)),
2497 fn = built_in_decls[BUILT_IN_STRCAT];
2499 /* If the replacement _DECL isn't initialized, don't do the
2504 return expand_expr (build_function_call_expr (fn, newarglist),
2505 target, mode, EXPAND_NORMAL);
2511 /* Expand expression EXP, which is a call to the strspn builtin.
2512 Return 0 if we failed the caller should emit a normal call,
2513 otherwise try to get the result in TARGET, if convenient. */
2515 expand_builtin_strspn (arglist, target, mode)
2518 enum machine_mode mode;
2520 /* If we need to check memory accesses, call the library function. */
2521 if (current_function_check_memory_usage)
2524 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2528 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
2529 const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
2531 /* If both arguments are constants, evaluate at compile-time. */
2534 const size_t r = strspn (p1, p2);
2535 return expand_expr (size_int (r), target, mode, EXPAND_NORMAL);
2538 /* If either argument is "", return 0. */
2539 if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
2541 /* Evaluate and ignore both arguments in case either one has
2543 expand_expr (s1, const0_rtx, VOIDmode, EXPAND_NORMAL);
2544 expand_expr (s2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2551 /* Expand expression EXP, which is a call to the strcspn builtin.
2552 Return 0 if we failed the caller should emit a normal call,
2553 otherwise try to get the result in TARGET, if convenient. */
2555 expand_builtin_strcspn (arglist, target, mode)
2558 enum machine_mode mode;
2560 /* If we need to check memory accesses, call the library function. */
2561 if (current_function_check_memory_usage)
2564 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2568 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
2569 const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
2571 /* If both arguments are constants, evaluate at compile-time. */
2574 const size_t r = strcspn (p1, p2);
2575 return expand_expr (size_int (r), target, mode, EXPAND_NORMAL);
2578 /* If the first argument is "", return 0. */
2579 if (p1 && *p1 == '\0')
2581 /* Evaluate and ignore argument s2 in case it has
2583 expand_expr (s2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2587 /* If the second argument is "", return __builtin_strlen(s1). */
2588 if (p2 && *p2 == '\0')
2590 tree newarglist = build_tree_list (NULL_TREE, s1),
2591 fn = built_in_decls[BUILT_IN_STRLEN];
2593 /* If the replacement _DECL isn't initialized, don't do the
2598 return expand_expr (build_function_call_expr (fn, newarglist),
2599 target, mode, EXPAND_NORMAL);
2605 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
2606 if that's convenient. */
2609 expand_builtin_saveregs ()
2613 /* Don't do __builtin_saveregs more than once in a function.
2614 Save the result of the first call and reuse it. */
2615 if (saveregs_value != 0)
2616 return saveregs_value;
2618 /* When this function is called, it means that registers must be
2619 saved on entry to this function. So we migrate the call to the
2620 first insn of this function. */
2624 #ifdef EXPAND_BUILTIN_SAVEREGS
2625 /* Do whatever the machine needs done in this case. */
2626 val = EXPAND_BUILTIN_SAVEREGS ();
2628 /* ??? We used to try and build up a call to the out of line function,
2629 guessing about what registers needed saving etc. This became much
2630 harder with __builtin_va_start, since we don't have a tree for a
2631 call to __builtin_saveregs to fall back on. There was exactly one
2632 port (i860) that used this code, and I'm unconvinced it could actually
2633 handle the general case. So we no longer try to handle anything
2634 weird and make the backend absorb the evil. */
2636 error ("__builtin_saveregs not supported by this target");
2643 saveregs_value = val;
2645 /* Put the sequence after the NOTE that starts the function. If this
2646 is inside a SEQUENCE, make the outer-level insn chain current, so
2647 the code is placed at the start of the function. */
2648 push_topmost_sequence ();
2649 emit_insns_after (seq, get_insns ());
2650 pop_topmost_sequence ();
2655 /* __builtin_args_info (N) returns word N of the arg space info
2656 for the current function. The number and meanings of words
2657 is controlled by the definition of CUMULATIVE_ARGS. */
2660 expand_builtin_args_info (exp)
2663 tree arglist = TREE_OPERAND (exp, 1);
2664 int nwords = sizeof (CUMULATIVE_ARGS) / sizeof (int);
2665 int *word_ptr = (int *) ¤t_function_args_info;
2667 /* These are used by the code below that is if 0'ed away */
2669 tree type, elts, result;
2672 if (sizeof (CUMULATIVE_ARGS) % sizeof (int) != 0)
2677 tree arg = TREE_VALUE (arglist);
2678 if (TREE_CODE (arg) != INTEGER_CST)
2679 error ("argument of `__builtin_args_info' must be constant");
2682 int wordnum = TREE_INT_CST_LOW (arg);
2684 if (wordnum < 0 || wordnum >= nwords || TREE_INT_CST_HIGH (arg))
2685 error ("argument of `__builtin_args_info' out of range");
2687 return GEN_INT (word_ptr[wordnum]);
2691 error ("missing argument in `__builtin_args_info'");
2696 for (i = 0; i < nwords; i++)
2697 elts = tree_cons (NULL_TREE, build_int_2 (word_ptr[i], 0));
2699 type = build_array_type (integer_type_node,
2700 build_index_type (build_int_2 (nwords, 0)));
2701 result = build (CONSTRUCTOR, type, NULL_TREE, nreverse (elts));
2702 TREE_CONSTANT (result) = 1;
2703 TREE_STATIC (result) = 1;
2704 result = build1 (INDIRECT_REF, build_pointer_type (type), result);
2705 TREE_CONSTANT (result) = 1;
2706 return expand_expr (result, NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD);
2710 /* Expand ARGLIST, from a call to __builtin_next_arg. */
2712 expand_builtin_next_arg (arglist)
2715 tree fntype = TREE_TYPE (current_function_decl);
2717 if ((TYPE_ARG_TYPES (fntype) == 0
2718 || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype)))
2720 && ! current_function_varargs)
2722 error ("`va_start' used in function with fixed args");
2728 tree last_parm = tree_last (DECL_ARGUMENTS (current_function_decl));
2729 tree arg = TREE_VALUE (arglist);
2731 /* Strip off all nops for the sake of the comparison. This
2732 is not quite the same as STRIP_NOPS. It does more.
2733 We must also strip off INDIRECT_EXPR for C++ reference
2735 while (TREE_CODE (arg) == NOP_EXPR
2736 || TREE_CODE (arg) == CONVERT_EXPR
2737 || TREE_CODE (arg) == NON_LVALUE_EXPR
2738 || TREE_CODE (arg) == INDIRECT_REF)
2739 arg = TREE_OPERAND (arg, 0);
2740 if (arg != last_parm)
2741 warning ("second parameter of `va_start' not last named argument");
2743 else if (! current_function_varargs)
2744 /* Evidently an out of date version of <stdarg.h>; can't validate
2745 va_start's second argument, but can still work as intended. */
2746 warning ("`__builtin_next_arg' called without an argument");
2748 return expand_binop (Pmode, add_optab,
2749 current_function_internal_arg_pointer,
2750 current_function_arg_offset_rtx,
2751 NULL_RTX, 0, OPTAB_LIB_WIDEN);
2754 /* Make it easier for the backends by protecting the valist argument
2755 from multiple evaluations. */
2758 stabilize_va_list (valist, needs_lvalue)
2762 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
2764 if (TREE_SIDE_EFFECTS (valist))
2765 valist = save_expr (valist);
2767 /* For this case, the backends will be expecting a pointer to
2768 TREE_TYPE (va_list_type_node), but it's possible we've
2769 actually been given an array (an actual va_list_type_node).
2771 if (TREE_CODE (TREE_TYPE (valist)) == ARRAY_TYPE)
2773 tree p1 = build_pointer_type (TREE_TYPE (va_list_type_node));
2774 tree p2 = build_pointer_type (va_list_type_node);
2776 valist = build1 (ADDR_EXPR, p2, valist);
2777 valist = fold (build1 (NOP_EXPR, p1, valist));
2786 if (! TREE_SIDE_EFFECTS (valist))
2789 pt = build_pointer_type (va_list_type_node);
2790 valist = fold (build1 (ADDR_EXPR, pt, valist));
2791 TREE_SIDE_EFFECTS (valist) = 1;
2794 if (TREE_SIDE_EFFECTS (valist))
2795 valist = save_expr (valist);
2796 valist = fold (build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (valist)),
2803 /* The "standard" implementation of va_start: just assign `nextarg' to
2806 std_expand_builtin_va_start (stdarg_p, valist, nextarg)
2815 /* The dummy named parameter is declared as a 'word' sized
2816 object, but if a 'word' is smaller than an 'int', it would
2817 have been promoted to int when it was added to the arglist. */
2818 int align = PARM_BOUNDARY / BITS_PER_UNIT;
2819 int size = MAX (UNITS_PER_WORD,
2820 GET_MODE_SIZE (TYPE_MODE (integer_type_node)));
2821 int offset = ((size + align - 1) / align) * align;
2822 nextarg = plus_constant (nextarg, -offset);
2825 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
2826 make_tree (ptr_type_node, nextarg));
2827 TREE_SIDE_EFFECTS (t) = 1;
2829 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2832 /* Expand ARGLIST, which from a call to __builtin_stdarg_va_start or
2833 __builtin_varargs_va_start, depending on STDARG_P. */
2835 expand_builtin_va_start (stdarg_p, arglist)
2840 tree chain = arglist, valist;
2843 nextarg = expand_builtin_next_arg (chain = TREE_CHAIN (arglist));
2845 nextarg = expand_builtin_next_arg (NULL_TREE);
2847 if (TREE_CHAIN (chain))
2848 error ("too many arguments to function `va_start'");
2850 valist = stabilize_va_list (TREE_VALUE (arglist), 1);
2852 #ifdef EXPAND_BUILTIN_VA_START
2853 EXPAND_BUILTIN_VA_START (stdarg_p, valist, nextarg);
2855 std_expand_builtin_va_start (stdarg_p, valist, nextarg);
2861 /* The "standard" implementation of va_arg: read the value from the
2862 current (padded) address and increment by the (padded) size. */
2865 std_expand_builtin_va_arg (valist, type)
2869 HOST_WIDE_INT align;
2870 HOST_WIDE_INT rounded_size;
2873 /* Compute the rounded size of the type. */
2874 align = PARM_BOUNDARY / BITS_PER_UNIT;
2875 rounded_size = (((int_size_in_bytes (type) + align - 1) / align) * align);
2879 if (PAD_VARARGS_DOWN)
2881 /* Small args are padded downward. */
2884 adj = TREE_INT_CST_LOW (TYPE_SIZE (type)) / BITS_PER_UNIT;
2885 if (rounded_size > align)
2888 addr_tree = build (PLUS_EXPR, TREE_TYPE (addr_tree), addr_tree,
2889 build_int_2 (rounded_size - adj, 0));
2892 addr = expand_expr (addr_tree, NULL_RTX, Pmode, EXPAND_NORMAL);
2893 addr = copy_to_reg (addr);
2895 /* Compute new value for AP. */
2896 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
2897 build (PLUS_EXPR, TREE_TYPE (valist), valist,
2898 build_int_2 (rounded_size, 0)));
2899 TREE_SIDE_EFFECTS (t) = 1;
2900 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2905 /* Expand __builtin_va_arg, which is not really a builtin function, but
2906 a very special sort of operator. */
2909 expand_builtin_va_arg (valist, type)
2913 tree promoted_type, want_va_type, have_va_type;
2915 /* Verify that valist is of the proper type. */
2917 want_va_type = va_list_type_node;
2918 have_va_type = TREE_TYPE (valist);
2919 if (TREE_CODE (want_va_type) == ARRAY_TYPE)
2921 /* If va_list is an array type, the argument may have decayed
2922 to a pointer type, e.g. by being passed to another function.
2923 In that case, unwrap both types so that we can compare the
2924 underlying records. */
2925 if (TREE_CODE (have_va_type) == ARRAY_TYPE
2926 || TREE_CODE (have_va_type) == POINTER_TYPE)
2928 want_va_type = TREE_TYPE (want_va_type);
2929 have_va_type = TREE_TYPE (have_va_type);
2932 if (TYPE_MAIN_VARIANT (want_va_type) != TYPE_MAIN_VARIANT (have_va_type))
2934 error ("first argument to `va_arg' not of type `va_list'");
2938 /* Generate a diagnostic for requesting data of a type that cannot
2939 be passed through `...' due to type promotion at the call site. */
2940 else if ((promoted_type = (*lang_type_promotes_to) (type)) != NULL_TREE)
2942 const char *name = "<anonymous type>", *pname = 0;
2943 static int gave_help;
2945 if (TYPE_NAME (type))
2947 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
2948 name = IDENTIFIER_POINTER (TYPE_NAME (type));
2949 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
2950 && DECL_NAME (TYPE_NAME (type)))
2951 name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
2953 if (TYPE_NAME (promoted_type))
2955 if (TREE_CODE (TYPE_NAME (promoted_type)) == IDENTIFIER_NODE)
2956 pname = IDENTIFIER_POINTER (TYPE_NAME (promoted_type));
2957 else if (TREE_CODE (TYPE_NAME (promoted_type)) == TYPE_DECL
2958 && DECL_NAME (TYPE_NAME (promoted_type)))
2959 pname = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (promoted_type)));
2962 error ("`%s' is promoted to `%s' when passed through `...'", name, pname);
2966 error ("(so you should pass `%s' not `%s' to `va_arg')", pname, name);
2973 /* Make it easier for the backends by protecting the valist argument
2974 from multiple evaluations. */
2975 valist = stabilize_va_list (valist, 0);
2977 #ifdef EXPAND_BUILTIN_VA_ARG
2978 addr = EXPAND_BUILTIN_VA_ARG (valist, type);
2980 addr = std_expand_builtin_va_arg (valist, type);
2984 result = gen_rtx_MEM (TYPE_MODE (type), addr);
2985 MEM_ALIAS_SET (result) = get_varargs_alias_set ();
2990 /* Expand ARGLIST, from a call to __builtin_va_end. */
2993 expand_builtin_va_end (arglist)
2996 tree valist = TREE_VALUE (arglist);
2998 #ifdef EXPAND_BUILTIN_VA_END
2999 valist = stabilize_va_list (valist, 0);
3000 EXPAND_BUILTIN_VA_END(arglist);
3002 /* Evaluate for side effects, if needed. I hate macros that don't
3004 if (TREE_SIDE_EFFECTS (valist))
3005 expand_expr (valist, const0_rtx, VOIDmode, EXPAND_NORMAL);
3011 /* Expand ARGLIST, from a call to __builtin_va_copy. We do this as a
3012 builtin rather than just as an assignment in stdarg.h because of the
3013 nastiness of array-type va_list types. */
3016 expand_builtin_va_copy (arglist)
3021 dst = TREE_VALUE (arglist);
3022 src = TREE_VALUE (TREE_CHAIN (arglist));
3024 dst = stabilize_va_list (dst, 1);
3025 src = stabilize_va_list (src, 0);
3027 if (TREE_CODE (va_list_type_node) != ARRAY_TYPE)
3029 t = build (MODIFY_EXPR, va_list_type_node, dst, src);
3030 TREE_SIDE_EFFECTS (t) = 1;
3031 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
3035 rtx dstb, srcb, size;
3037 /* Evaluate to pointers. */
3038 dstb = expand_expr (dst, NULL_RTX, Pmode, EXPAND_NORMAL);
3039 srcb = expand_expr (src, NULL_RTX, Pmode, EXPAND_NORMAL);
3040 size = expand_expr (TYPE_SIZE_UNIT (va_list_type_node), NULL_RTX,
3041 VOIDmode, EXPAND_NORMAL);
3043 /* "Dereference" to BLKmode memories. */
3044 dstb = gen_rtx_MEM (BLKmode, dstb);
3045 MEM_ALIAS_SET (dstb) = get_alias_set (TREE_TYPE (TREE_TYPE (dst)));
3046 srcb = gen_rtx_MEM (BLKmode, srcb);
3047 MEM_ALIAS_SET (srcb) = get_alias_set (TREE_TYPE (TREE_TYPE (src)));
3050 emit_block_move (dstb, srcb, size, TYPE_ALIGN (va_list_type_node));
3056 /* Expand a call to one of the builtin functions __builtin_frame_address or
3057 __builtin_return_address. */
3059 expand_builtin_frame_address (exp)
3062 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3063 tree arglist = TREE_OPERAND (exp, 1);
3065 /* The argument must be a nonnegative integer constant.
3066 It counts the number of frames to scan up the stack.
3067 The value is the return address saved in that frame. */
3069 /* Warning about missing arg was already issued. */
3071 else if (TREE_CODE (TREE_VALUE (arglist)) != INTEGER_CST
3072 || tree_int_cst_sgn (TREE_VALUE (arglist)) < 0)
3074 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3075 error ("invalid arg to `__builtin_frame_address'");
3077 error ("invalid arg to `__builtin_return_address'");
3082 rtx tem = expand_builtin_return_addr (DECL_FUNCTION_CODE (fndecl),
3083 TREE_INT_CST_LOW (TREE_VALUE (arglist)),
3084 hard_frame_pointer_rtx);
3086 /* Some ports cannot access arbitrary stack frames. */
3089 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3090 warning ("unsupported arg to `__builtin_frame_address'");
3092 warning ("unsupported arg to `__builtin_return_address'");
3096 /* For __builtin_frame_address, return what we've got. */
3097 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3100 if (GET_CODE (tem) != REG
3101 && ! CONSTANT_P (tem))
3102 tem = copy_to_mode_reg (Pmode, tem);
3107 /* Expand a call to the alloca builtin, with arguments ARGLIST. Return 0 if
3108 we failed and the caller should emit a normal call, otherwise try to get
3109 the result in TARGET, if convenient. */
3112 expand_builtin_alloca (arglist, target)
3119 if (!validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
3122 /* Compute the argument. */
3123 op0 = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
3125 /* Allocate the desired space. */
3126 result = allocate_dynamic_stack_space (op0, target, BITS_PER_UNIT);
3128 #ifdef POINTERS_EXTEND_UNSIGNED
3129 result = convert_memory_address (ptr_mode, result);
3135 /* Expand a call to the ffs builtin. The arguments are in ARGLIST.
3136 Return 0 if a normal call should be emitted rather than expanding the
3137 function in-line. If convenient, the result should be placed in TARGET.
3138 SUBTARGET may be used as the target for computing one of EXP's operands. */
3141 expand_builtin_ffs (arglist, target, subtarget)
3143 rtx target, subtarget;
3146 if (!validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
3149 /* Compute the argument. */
3150 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
3151 /* Compute ffs, into TARGET if possible.
3152 Set TARGET to wherever the result comes back. */
3153 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
3154 ffs_optab, op0, target, 1);
3160 /* If the string passed to fputs is a constant and is one character
3161 long, we attempt to transform this call into __builtin_fputc(). */
3164 expand_builtin_fputs (arglist, ignore)
3168 tree len, fn, fn_fputc = built_in_decls[BUILT_IN_FPUTC],
3169 fn_fwrite = built_in_decls[BUILT_IN_FWRITE];
3171 /* If the return value is used, or the replacement _DECL isn't
3172 initialized, don't do the transformation. */
3173 if (!ignore || !fn_fputc || !fn_fwrite)
3176 /* Verify the arguments in the original call. */
3177 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
3178 || current_function_check_memory_usage)
3181 /* Get the length of the string passed to fputs. If the length
3182 can't be determined, punt. */
3183 if (!(len = c_strlen (TREE_VALUE (arglist)))
3184 || TREE_CODE (len) != INTEGER_CST)
3187 switch (compare_tree_int (len, 1))
3189 case -1: /* length is 0, delete the call entirely . */
3191 /* Evaluate and ignore the argument in case it has
3193 expand_expr (TREE_VALUE (TREE_CHAIN (arglist)), const0_rtx,
3194 VOIDmode, EXPAND_NORMAL);
3197 case 0: /* length is 1, call fputc. */
3199 const char *p = c_getstr (TREE_VALUE (arglist));
3203 /* New argument list transforming fputs(string, stream) to
3204 fputc(string[0], stream). */
3206 build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)));
3208 tree_cons (NULL_TREE, build_int_2 (p[0], 0), arglist);
3214 case 1: /* length is greater than 1, call fwrite. */
3216 tree string_arg = TREE_VALUE (arglist);
3218 /* New argument list transforming fputs(string, stream) to
3219 fwrite(string, 1, len, stream). */
3220 arglist = build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)));
3221 arglist = tree_cons (NULL_TREE, len, arglist);
3222 arglist = tree_cons (NULL_TREE, size_one_node, arglist);
3223 arglist = tree_cons (NULL_TREE, string_arg, arglist);
3231 return expand_expr (build_function_call_expr (fn, arglist),
3232 (ignore ? const0_rtx : NULL_RTX),
3233 VOIDmode, EXPAND_NORMAL);
3236 /* Expand a call to __builtin_expect. We return our argument and emit a
3237 NOTE_INSN_EXPECTED_VALUE note. This is the expansion of __builtin_expect in
3238 a non-jump context. */
3241 expand_builtin_expect (arglist, target)
3248 if (arglist == NULL_TREE
3249 || TREE_CHAIN (arglist) == NULL_TREE)
3251 exp = TREE_VALUE (arglist);
3252 c = TREE_VALUE (TREE_CHAIN (arglist));
3254 if (TREE_CODE (c) != INTEGER_CST)
3256 error ("second arg to `__builtin_expect' must be a constant");
3257 c = integer_zero_node;
3260 target = expand_expr (exp, target, VOIDmode, EXPAND_NORMAL);
3262 /* Don't bother with expected value notes for integral constants. */
3263 if (GET_CODE (target) != CONST_INT)
3265 /* We do need to force this into a register so that we can be
3266 moderately sure to be able to correctly interpret the branch
3268 target = force_reg (GET_MODE (target), target);
3270 rtx_c = expand_expr (c, NULL_RTX, GET_MODE (target), EXPAND_NORMAL);
3272 note = emit_note (NULL, NOTE_INSN_EXPECTED_VALUE);
3273 NOTE_EXPECTED_VALUE (note) = gen_rtx_EQ (VOIDmode, target, rtx_c);
3279 /* Like expand_builtin_expect, except do this in a jump context. This is
3280 called from do_jump if the conditional is a __builtin_expect. Return either
3281 a SEQUENCE of insns to emit the jump or NULL if we cannot optimize
3282 __builtin_expect. We need to optimize this at jump time so that machines
3283 like the PowerPC don't turn the test into a SCC operation, and then jump
3284 based on the test being 0/1. */
3287 expand_builtin_expect_jump (exp, if_false_label, if_true_label)
3292 tree arglist = TREE_OPERAND (exp, 1);
3293 tree arg0 = TREE_VALUE (arglist);
3294 tree arg1 = TREE_VALUE (TREE_CHAIN (arglist));
3297 /* Only handle __builtin_expect (test, 0) and
3298 __builtin_expect (test, 1). */
3299 if (TREE_CODE (TREE_TYPE (arg1)) == INTEGER_TYPE
3300 && TREE_CODE (arg1) == INTEGER_CST
3301 && (TREE_INT_CST_LOW (arg1) == 0 || TREE_INT_CST_LOW (arg1) == 1)
3302 && TREE_INT_CST_HIGH (arg1) == 0)
3307 /* Expand the jump insns. */
3309 do_jump (arg0, if_false_label, if_true_label);
3310 ret = gen_sequence ();
3313 /* Now that the __builtin_expect has been validated, go through and add
3314 the expect's to each of the conditional jumps. If we run into an
3315 error, just give up and generate the 'safe' code of doing a SCC
3316 operation and then doing a branch on that. */
3317 for (j = 0; j < XVECLEN (ret, 0); j++)
3319 rtx insn = XVECEXP (ret, 0, j);
3322 if (GET_CODE (insn) == JUMP_INSN && any_condjump_p (insn)
3323 && (pattern = pc_set (insn)) != NULL_RTX)
3325 rtx ifelse = SET_SRC (pattern);
3329 if (GET_CODE (ifelse) != IF_THEN_ELSE)
3332 if (GET_CODE (XEXP (ifelse, 1)) == LABEL_REF)
3335 label = XEXP (XEXP (ifelse, 1), 0);
3337 /* An inverted jump reverses the probabilities. */
3338 else if (GET_CODE (XEXP (ifelse, 2)) == LABEL_REF)
3341 label = XEXP (XEXP (ifelse, 2), 0);
3343 /* We shouldn't have to worry about conditional returns during
3344 the expansion stage, but handle it gracefully anyway. */
3345 else if (GET_CODE (XEXP (ifelse, 1)) == RETURN)
3350 /* An inverted return reverses the probabilities. */
3351 else if (GET_CODE (XEXP (ifelse, 2)) == RETURN)
3359 /* If the test is expected to fail, reverse the
3361 if (TREE_INT_CST_LOW (arg1) == 0)
3364 /* If we are jumping to the false label, reverse the
3366 if (label == NULL_RTX)
3367 ; /* conditional return */
3368 else if (label == if_false_label)
3370 else if (label != if_true_label)
3374 predict_insn_def (insn, PRED_BUILTIN_EXPECT, taken);
3378 /* If no jumps were modified, fail and do __builtin_expect the normal
3388 /* Expand an expression EXP that calls a built-in function,
3389 with result going to TARGET if that's convenient
3390 (and in mode MODE if that's convenient).
3391 SUBTARGET may be used as the target for computing one of EXP's operands.
3392 IGNORE is nonzero if the value is to be ignored. */
3395 expand_builtin (exp, target, subtarget, mode, ignore)
3399 enum machine_mode mode;
3402 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3403 tree arglist = TREE_OPERAND (exp, 1);
3404 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
3406 #ifdef MD_EXPAND_BUILTIN
3407 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
3408 return MD_EXPAND_BUILTIN (exp, target, subtarget, mode, ignore);
3411 /* When not optimizing, generate calls to library functions for a certain
3413 if (! optimize && ! CALLED_AS_BUILT_IN (fndecl)
3414 && (fcode == BUILT_IN_SIN || fcode == BUILT_IN_COS
3415 || fcode == BUILT_IN_FSQRT || fcode == BUILT_IN_SQRTF
3416 || fcode == BUILT_IN_SQRTL || fcode == BUILT_IN_MEMSET
3417 || fcode == BUILT_IN_MEMCPY || fcode == BUILT_IN_MEMCMP
3418 || fcode == BUILT_IN_BCMP || fcode == BUILT_IN_BZERO
3419 || fcode == BUILT_IN_INDEX || fcode == BUILT_IN_RINDEX
3420 || fcode == BUILT_IN_STRCHR || fcode == BUILT_IN_STRRCHR
3421 || fcode == BUILT_IN_STRLEN || fcode == BUILT_IN_STRCPY
3422 || fcode == BUILT_IN_STRNCPY || fcode == BUILT_IN_STRNCMP
3423 || fcode == BUILT_IN_STRSTR || fcode == BUILT_IN_STRPBRK
3424 || fcode == BUILT_IN_STRCAT || fcode == BUILT_IN_STRNCAT
3425 || fcode == BUILT_IN_STRSPN || fcode == BUILT_IN_STRCSPN
3426 || fcode == BUILT_IN_STRCMP || fcode == BUILT_IN_FFS
3427 || fcode == BUILT_IN_PUTCHAR || fcode == BUILT_IN_PUTS
3428 || fcode == BUILT_IN_PRINTF || fcode == BUILT_IN_FPUTC
3429 || fcode == BUILT_IN_FPUTS || fcode == BUILT_IN_FWRITE))
3430 return expand_call (exp, target, ignore);
3436 case BUILT_IN_LLABS:
3437 case BUILT_IN_IMAXABS:
3439 case BUILT_IN_FABSF:
3440 case BUILT_IN_FABSL:
3441 /* build_function_call changes these into ABS_EXPR. */
3445 case BUILT_IN_CONJF:
3446 case BUILT_IN_CONJL:
3447 case BUILT_IN_CREAL:
3448 case BUILT_IN_CREALF:
3449 case BUILT_IN_CREALL:
3450 case BUILT_IN_CIMAG:
3451 case BUILT_IN_CIMAGF:
3452 case BUILT_IN_CIMAGL:
3453 /* expand_tree_builtin changes these into CONJ_EXPR, REALPART_EXPR
3454 and IMAGPART_EXPR. */
3463 /* Treat these like sqrt only if unsafe math optimizations are allowed,
3464 because of possible accuracy problems. */
3465 if (! flag_unsafe_math_optimizations)
3467 case BUILT_IN_FSQRT:
3468 case BUILT_IN_SQRTF:
3469 case BUILT_IN_SQRTL:
3470 target = expand_builtin_mathfn (exp, target, subtarget);
3478 case BUILT_IN_APPLY_ARGS:
3479 return expand_builtin_apply_args ();
3481 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
3482 FUNCTION with a copy of the parameters described by
3483 ARGUMENTS, and ARGSIZE. It returns a block of memory
3484 allocated on the stack into which is stored all the registers
3485 that might possibly be used for returning the result of a
3486 function. ARGUMENTS is the value returned by
3487 __builtin_apply_args. ARGSIZE is the number of bytes of
3488 arguments that must be copied. ??? How should this value be
3489 computed? We'll also need a safe worst case value for varargs
3491 case BUILT_IN_APPLY:
3492 if (!validate_arglist (arglist, POINTER_TYPE,
3493 POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
3494 && !validate_arglist (arglist, REFERENCE_TYPE,
3495 POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
3503 for (t = arglist, i = 0; t; t = TREE_CHAIN (t), i++)
3504 ops[i] = expand_expr (TREE_VALUE (t), NULL_RTX, VOIDmode, 0);
3506 return expand_builtin_apply (ops[0], ops[1], ops[2]);
3509 /* __builtin_return (RESULT) causes the function to return the
3510 value described by RESULT. RESULT is address of the block of
3511 memory returned by __builtin_apply. */
3512 case BUILT_IN_RETURN:
3513 if (validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
3514 expand_builtin_return (expand_expr (TREE_VALUE (arglist),
3515 NULL_RTX, VOIDmode, 0));
3518 case BUILT_IN_SAVEREGS:
3519 return expand_builtin_saveregs ();
3521 case BUILT_IN_ARGS_INFO:
3522 return expand_builtin_args_info (exp);
3524 /* Return the address of the first anonymous stack arg. */
3525 case BUILT_IN_NEXT_ARG:
3526 return expand_builtin_next_arg (arglist);
3528 case BUILT_IN_CLASSIFY_TYPE:
3529 return expand_builtin_classify_type (arglist);
3531 case BUILT_IN_CONSTANT_P:
3532 return expand_builtin_constant_p (exp);
3534 case BUILT_IN_FRAME_ADDRESS:
3535 case BUILT_IN_RETURN_ADDRESS:
3536 return expand_builtin_frame_address (exp);
3538 /* Returns the address of the area where the structure is returned.
3540 case BUILT_IN_AGGREGATE_INCOMING_ADDRESS:
3542 || ! AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl)))
3543 || GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl))) != MEM)
3546 return XEXP (DECL_RTL (DECL_RESULT (current_function_decl)), 0);
3548 case BUILT_IN_ALLOCA:
3549 target = expand_builtin_alloca (arglist, target);
3555 target = expand_builtin_ffs (arglist, target, subtarget);
3560 case BUILT_IN_STRLEN:
3561 target = expand_builtin_strlen (exp, target);
3566 case BUILT_IN_STRCPY:
3567 target = expand_builtin_strcpy (exp);
3572 case BUILT_IN_STRNCPY:
3573 target = expand_builtin_strncpy (arglist, target, mode);
3578 case BUILT_IN_STRCAT:
3579 target = expand_builtin_strcat (arglist, target, mode);
3584 case BUILT_IN_STRNCAT:
3585 target = expand_builtin_strncat (arglist, target, mode);
3590 case BUILT_IN_STRSPN:
3591 target = expand_builtin_strspn (arglist, target, mode);
3596 case BUILT_IN_STRCSPN:
3597 target = expand_builtin_strcspn (arglist, target, mode);
3602 case BUILT_IN_STRSTR:
3603 target = expand_builtin_strstr (arglist, target, mode);
3608 case BUILT_IN_STRPBRK:
3609 target = expand_builtin_strpbrk (arglist, target, mode);
3614 case BUILT_IN_INDEX:
3615 case BUILT_IN_STRCHR:
3616 target = expand_builtin_strchr (arglist, target, mode);
3621 case BUILT_IN_RINDEX:
3622 case BUILT_IN_STRRCHR:
3623 target = expand_builtin_strrchr (arglist, target, mode);
3628 case BUILT_IN_MEMCPY:
3629 target = expand_builtin_memcpy (arglist);
3634 case BUILT_IN_MEMSET:
3635 target = expand_builtin_memset (exp);
3640 case BUILT_IN_BZERO:
3641 target = expand_builtin_bzero (exp);
3646 case BUILT_IN_STRCMP:
3647 target = expand_builtin_strcmp (exp, target, mode);
3652 case BUILT_IN_STRNCMP:
3653 target = expand_builtin_strncmp (exp, target, mode);
3658 /* These comparison functions need an instruction that returns an actual
3659 index. An ordinary compare that just sets the condition codes
3661 #ifdef HAVE_cmpstrsi
3663 case BUILT_IN_MEMCMP:
3664 target = expand_builtin_memcmp (exp, arglist, target);
3670 case BUILT_IN_MEMCMP:
3674 case BUILT_IN_SETJMP:
3675 target = expand_builtin_setjmp (arglist, target);
3680 /* __builtin_longjmp is passed a pointer to an array of five words.
3681 It's similar to the C library longjmp function but works with
3682 __builtin_setjmp above. */
3683 case BUILT_IN_LONGJMP:
3684 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
3688 rtx buf_addr = expand_expr (TREE_VALUE (arglist), subtarget,
3690 rtx value = expand_expr (TREE_VALUE (TREE_CHAIN (arglist)),
3691 NULL_RTX, VOIDmode, 0);
3693 if (value != const1_rtx)
3695 error ("__builtin_longjmp second argument must be 1");
3699 expand_builtin_longjmp (buf_addr, value);
3706 emit_insn (gen_trap ());
3709 error ("__builtin_trap not supported by this target");
3713 case BUILT_IN_PUTCHAR:
3715 case BUILT_IN_FPUTC:
3716 case BUILT_IN_FWRITE:
3718 case BUILT_IN_FPUTS:
3719 target = expand_builtin_fputs (arglist, ignore);
3724 /* Various hooks for the DWARF 2 __throw routine. */
3725 case BUILT_IN_UNWIND_INIT:
3726 expand_builtin_unwind_init ();
3728 case BUILT_IN_DWARF_CFA:
3729 return virtual_cfa_rtx;
3730 #ifdef DWARF2_UNWIND_INFO
3731 case BUILT_IN_DWARF_FP_REGNUM:
3732 return expand_builtin_dwarf_fp_regnum ();
3733 case BUILT_IN_INIT_DWARF_REG_SIZES:
3734 expand_builtin_init_dwarf_reg_sizes (TREE_VALUE (arglist));
3737 case BUILT_IN_FROB_RETURN_ADDR:
3738 return expand_builtin_frob_return_addr (TREE_VALUE (arglist));
3739 case BUILT_IN_EXTRACT_RETURN_ADDR:
3740 return expand_builtin_extract_return_addr (TREE_VALUE (arglist));
3741 case BUILT_IN_EH_RETURN:
3742 expand_builtin_eh_return (TREE_VALUE (arglist),
3743 TREE_VALUE (TREE_CHAIN (arglist)));
3745 #ifdef EH_RETURN_DATA_REGNO
3746 case BUILT_IN_EH_RETURN_DATA_REGNO:
3747 return expand_builtin_eh_return_data_regno (arglist);
3749 case BUILT_IN_VARARGS_START:
3750 return expand_builtin_va_start (0, arglist);
3751 case BUILT_IN_STDARG_START:
3752 return expand_builtin_va_start (1, arglist);
3753 case BUILT_IN_VA_END:
3754 return expand_builtin_va_end (arglist);
3755 case BUILT_IN_VA_COPY:
3756 return expand_builtin_va_copy (arglist);
3757 case BUILT_IN_EXPECT:
3758 return expand_builtin_expect (arglist, target);
3760 default: /* just do library call, if unknown builtin */
3761 error ("built-in function `%s' not currently supported",
3762 IDENTIFIER_POINTER (DECL_NAME (fndecl)));
3765 /* The switch statement above can drop through to cause the function
3766 to be called normally. */
3767 return expand_call (exp, target, ignore);
3770 /* Fold a call to __builtin_constant_p, if we know it will evaluate to a
3771 constant. ARGLIST is the argument list of the call. */
3774 fold_builtin_constant_p (arglist)
3780 arglist = TREE_VALUE (arglist);
3782 /* We return 1 for a numeric type that's known to be a constant
3783 value at compile-time or for an aggregate type that's a
3784 literal constant. */
3785 STRIP_NOPS (arglist);
3787 /* If we know this is a constant, emit the constant of one. */
3788 if (TREE_CODE_CLASS (TREE_CODE (arglist)) == 'c'
3789 || (TREE_CODE (arglist) == CONSTRUCTOR
3790 && TREE_CONSTANT (arglist))
3791 || (TREE_CODE (arglist) == ADDR_EXPR
3792 && TREE_CODE (TREE_OPERAND (arglist, 0)) == STRING_CST))
3793 return integer_one_node;
3795 /* If we aren't going to be running CSE or this expression
3796 has side effects, show we don't know it to be a constant.
3797 Likewise if it's a pointer or aggregate type since in those
3798 case we only want literals, since those are only optimized
3799 when generating RTL, not later. */
3800 if (TREE_SIDE_EFFECTS (arglist) || cse_not_expected
3801 || AGGREGATE_TYPE_P (TREE_TYPE (arglist))
3802 || POINTER_TYPE_P (TREE_TYPE (arglist)))
3803 return integer_zero_node;
3808 /* Used by constant folding to eliminate some builtin calls early. EXP is
3809 the CALL_EXPR of a call to a builtin function. */
3815 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3816 tree arglist = TREE_OPERAND (exp, 1);
3817 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
3819 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
3824 case BUILT_IN_CONSTANT_P:
3825 return fold_builtin_constant_p (arglist);
3827 case BUILT_IN_STRLEN:
3828 if (validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
3830 tree len = c_strlen (TREE_VALUE (arglist));
3844 build_function_call_expr (fn, arglist)
3849 call_expr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), fn);
3850 call_expr = build (CALL_EXPR, TREE_TYPE (TREE_TYPE (fn)),
3851 call_expr, arglist);
3852 TREE_SIDE_EFFECTS (call_expr) = 1;
3853 return fold (call_expr);
3856 /* This function validates the types of a function call argument list
3857 represented as a tree chain of parameters against a specified list
3858 of tree_codes. If the last specifier is a 0, that represents an
3859 ellipses, otherwise the last specifier must be a VOID_TYPE. */
3861 validate_arglist VPARAMS ((tree arglist, ...))
3863 #ifndef ANSI_PROTOTYPES
3866 enum tree_code code;
3869 VA_START (ap, arglist);
3871 #ifndef ANSI_PROTOTYPES
3872 arglist = va_arg (ap, tree);
3876 code = va_arg (ap, enum tree_code);
3880 /* This signifies an ellipses, any further arguments are all ok. */
3884 /* This signifies an endlink, if no arguments remain, return
3885 true, otherwise return false. */
3887 return arglist == 0;
3889 /* If no parameters remain or the parameter's code does not
3890 match the specified code, return false. Otherwise continue
3891 checking any remaining arguments. */
3892 if (arglist == 0 || code != TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))))
3899 arglist = TREE_CHAIN (arglist);