1 /* Expand builtin functions.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000 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-flags.h"
34 #include "insn-codes.h"
35 #include "insn-config.h"
39 #include "typeclass.h"
44 #define CALLED_AS_BUILT_IN(NODE) \
45 (!strncmp (IDENTIFIER_POINTER (DECL_NAME (NODE)), "__builtin_", 10))
47 /* Register mappings for target machines without register windows. */
48 #ifndef INCOMING_REGNO
49 #define INCOMING_REGNO(OUT) (OUT)
51 #ifndef OUTGOING_REGNO
52 #define OUTGOING_REGNO(IN) (IN)
55 #ifndef PAD_VARARGS_DOWN
56 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
59 /* Define the names of the builtin function types and codes. */
60 const char *const built_in_class_names[4]
61 = {"NOT_BUILT_IN", "BUILT_IN_FRONTEND", "BUILT_IN_MD", "BUILT_IN_NORMAL"};
63 #define DEF_BUILTIN(x) STRINGIFY(x),
64 const char *const built_in_names[(int) END_BUILTINS] =
66 #include "builtins.def"
70 /* Setup an array of _DECL trees, make sure each element is
71 initialized to NULL_TREE. */
72 #define DEF_BUILTIN(x) NULL_TREE,
73 tree built_in_decls[(int) END_BUILTINS] =
75 #include "builtins.def"
79 tree (*lang_type_promotes_to) PARAMS ((tree));
81 static int get_pointer_alignment PARAMS ((tree, unsigned));
82 static tree c_strlen PARAMS ((tree));
83 static const char *c_getstr PARAMS ((tree));
84 static rtx c_readstr PARAMS ((const char *,
86 static int target_char_cast PARAMS ((tree, char *));
87 static rtx get_memory_rtx PARAMS ((tree));
88 static int apply_args_size PARAMS ((void));
89 static int apply_result_size PARAMS ((void));
90 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
91 static rtx result_vector PARAMS ((int, rtx));
93 static rtx expand_builtin_setjmp PARAMS ((tree, rtx));
94 static rtx expand_builtin_apply_args PARAMS ((void));
95 static rtx expand_builtin_apply_args_1 PARAMS ((void));
96 static rtx expand_builtin_apply PARAMS ((rtx, rtx, rtx));
97 static void expand_builtin_return PARAMS ((rtx));
98 static rtx expand_builtin_classify_type PARAMS ((tree));
99 static rtx expand_builtin_mathfn PARAMS ((tree, rtx, rtx));
100 static rtx expand_builtin_constant_p PARAMS ((tree));
101 static rtx expand_builtin_args_info PARAMS ((tree));
102 static rtx expand_builtin_next_arg PARAMS ((tree));
103 static rtx expand_builtin_va_start PARAMS ((int, tree));
104 static rtx expand_builtin_va_end PARAMS ((tree));
105 static rtx expand_builtin_va_copy PARAMS ((tree));
107 static rtx expand_builtin_memcmp PARAMS ((tree, tree, rtx));
109 static rtx expand_builtin_strcmp PARAMS ((tree, rtx,
111 static rtx expand_builtin_strncmp PARAMS ((tree, rtx,
113 static rtx builtin_memcpy_read_str PARAMS ((PTR, HOST_WIDE_INT,
115 static rtx expand_builtin_strcat PARAMS ((tree, rtx,
117 static rtx expand_builtin_strncat PARAMS ((tree, rtx,
119 static rtx expand_builtin_strspn PARAMS ((tree, rtx,
121 static rtx expand_builtin_strcspn PARAMS ((tree, rtx,
123 static rtx expand_builtin_memcpy PARAMS ((tree));
124 static rtx expand_builtin_strcpy PARAMS ((tree));
125 static rtx builtin_strncpy_read_str PARAMS ((PTR, HOST_WIDE_INT,
127 static rtx expand_builtin_strncpy PARAMS ((tree, rtx,
129 static rtx builtin_memset_read_str PARAMS ((PTR, HOST_WIDE_INT,
131 static rtx expand_builtin_memset PARAMS ((tree));
132 static rtx expand_builtin_bzero PARAMS ((tree));
133 static rtx expand_builtin_strlen PARAMS ((tree, rtx));
134 static rtx expand_builtin_strstr PARAMS ((tree, rtx,
136 static rtx expand_builtin_strpbrk PARAMS ((tree, rtx,
138 static rtx expand_builtin_strchr PARAMS ((tree, rtx,
140 static rtx expand_builtin_strrchr PARAMS ((tree, rtx,
142 static rtx expand_builtin_alloca PARAMS ((tree, rtx));
143 static rtx expand_builtin_ffs PARAMS ((tree, rtx, rtx));
144 static rtx expand_builtin_frame_address PARAMS ((tree));
145 static rtx expand_builtin_fputs PARAMS ((tree, int));
146 static tree stabilize_va_list PARAMS ((tree, int));
147 static rtx expand_builtin_expect PARAMS ((tree, rtx));
148 static tree fold_builtin_constant_p PARAMS ((tree));
149 static tree build_function_call_expr PARAMS ((tree, tree));
150 static int validate_arglist PARAMS ((tree, ...));
152 /* Return the alignment in bits of EXP, a pointer valued expression.
153 But don't return more than MAX_ALIGN no matter what.
154 The alignment returned is, by default, the alignment of the thing that
155 EXP points to (if it is not a POINTER_TYPE, 0 is returned).
157 Otherwise, look at the expression to see if we can do better, i.e., if the
158 expression is actually pointing at an object whose alignment is tighter. */
161 get_pointer_alignment (exp, max_align)
165 unsigned align, inner;
167 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
170 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
171 align = MIN (align, max_align);
175 switch (TREE_CODE (exp))
179 case NON_LVALUE_EXPR:
180 exp = TREE_OPERAND (exp, 0);
181 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
184 inner = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
185 align = MIN (inner, max_align);
189 /* If sum of pointer + int, restrict our maximum alignment to that
190 imposed by the integer. If not, we can't do any better than
192 if (! host_integerp (TREE_OPERAND (exp, 1), 1))
195 while (((tree_low_cst (TREE_OPERAND (exp, 1), 1) * BITS_PER_UNIT)
200 exp = TREE_OPERAND (exp, 0);
204 /* See what we are pointing at and look at its alignment. */
205 exp = TREE_OPERAND (exp, 0);
206 if (TREE_CODE (exp) == FUNCTION_DECL)
207 align = FUNCTION_BOUNDARY;
208 else if (DECL_P (exp))
209 align = DECL_ALIGN (exp);
210 #ifdef CONSTANT_ALIGNMENT
211 else if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'c')
212 align = CONSTANT_ALIGNMENT (exp, align);
214 return MIN (align, max_align);
222 /* Compute the length of a C string. TREE_STRING_LENGTH is not the right
223 way, because it could contain a zero byte in the middle.
224 TREE_STRING_LENGTH is the size of the character array, not the string.
226 The value returned is of type `ssizetype'.
228 Unfortunately, string_constant can't access the values of const char
229 arrays with initializers, so neither can we do so here. */
239 src = string_constant (src, &offset_node);
243 max = TREE_STRING_LENGTH (src) - 1;
244 ptr = TREE_STRING_POINTER (src);
246 if (offset_node && TREE_CODE (offset_node) != INTEGER_CST)
248 /* If the string has an internal zero byte (e.g., "foo\0bar"), we can't
249 compute the offset to the following null if we don't know where to
250 start searching for it. */
253 for (i = 0; i < max; i++)
257 /* We don't know the starting offset, but we do know that the string
258 has no internal zero bytes. We can assume that the offset falls
259 within the bounds of the string; otherwise, the programmer deserves
260 what he gets. Subtract the offset from the length of the string,
261 and return that. This would perhaps not be valid if we were dealing
262 with named arrays in addition to literal string constants. */
264 return size_diffop (size_int (max), offset_node);
267 /* We have a known offset into the string. Start searching there for
269 if (offset_node == 0)
273 /* Did we get a long long offset? If so, punt. */
274 if (TREE_INT_CST_HIGH (offset_node) != 0)
276 offset = TREE_INT_CST_LOW (offset_node);
279 /* If the offset is known to be out of bounds, warn, and call strlen at
281 if (offset < 0 || offset > max)
283 warning ("offset outside bounds of constant string");
287 /* Use strlen to search for the first zero byte. Since any strings
288 constructed with build_string will have nulls appended, we win even
289 if we get handed something like (char[4])"abcd".
291 Since OFFSET is our starting index into the string, no further
292 calculation is needed. */
293 return ssize_int (strlen (ptr + offset));
296 /* Return a char pointer for a C string if it is a string constant
297 or sum of string constant and integer constant. */
307 src = string_constant (src, &offset_node);
311 max = TREE_STRING_LENGTH (src) - 1;
312 ptr = TREE_STRING_POINTER (src);
316 else if (TREE_CODE (offset_node) != INTEGER_CST)
320 /* Did we get a long long offset? If so, punt. */
321 if (TREE_INT_CST_HIGH (offset_node) != 0)
323 offset = TREE_INT_CST_LOW (offset_node);
324 if (offset < 0 || offset > max)
331 /* Return a CONST_INT or CONST_DOUBLE corresponding to target
332 reading GET_MODE_BITSIZE (MODE) bits from string constant
336 c_readstr (str, mode)
338 enum machine_mode mode;
344 if (GET_MODE_CLASS (mode) != MODE_INT)
349 for (i = 0; i < GET_MODE_SIZE (mode); i++)
352 if (WORDS_BIG_ENDIAN)
353 j = GET_MODE_SIZE (mode) - i - 1;
354 if (BYTES_BIG_ENDIAN != WORDS_BIG_ENDIAN
355 && GET_MODE_SIZE (mode) > UNITS_PER_WORD)
356 j = j + UNITS_PER_WORD - 2 * (j % UNITS_PER_WORD) - 1;
358 if (j > 2 * HOST_BITS_PER_WIDE_INT)
361 ch = (unsigned char) str[i];
362 c[j / HOST_BITS_PER_WIDE_INT] |= ch << (j % HOST_BITS_PER_WIDE_INT);
364 return immed_double_const (c[0], c[1], mode);
367 /* Cast a target constant CST to target CHAR and if that value fits into
368 host char type, return zero and put that value into variable pointed by
372 target_char_cast (cst, p)
376 unsigned HOST_WIDE_INT val, hostval;
378 if (TREE_CODE (cst) != INTEGER_CST
379 || CHAR_TYPE_SIZE > HOST_BITS_PER_WIDE_INT)
382 val = TREE_INT_CST_LOW (cst);
383 if (CHAR_TYPE_SIZE < HOST_BITS_PER_WIDE_INT)
384 val &= (((unsigned HOST_WIDE_INT) 1) << CHAR_TYPE_SIZE) - 1;
387 if (HOST_BITS_PER_CHAR < HOST_BITS_PER_WIDE_INT)
388 hostval &= (((unsigned HOST_WIDE_INT) 1) << HOST_BITS_PER_CHAR) - 1;
397 /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
398 times to get the address of either a higher stack frame, or a return
399 address located within it (depending on FNDECL_CODE). */
402 expand_builtin_return_addr (fndecl_code, count, tem)
403 enum built_in_function fndecl_code;
409 /* Some machines need special handling before we can access
410 arbitrary frames. For example, on the sparc, we must first flush
411 all register windows to the stack. */
412 #ifdef SETUP_FRAME_ADDRESSES
414 SETUP_FRAME_ADDRESSES ();
417 /* On the sparc, the return address is not in the frame, it is in a
418 register. There is no way to access it off of the current frame
419 pointer, but it can be accessed off the previous frame pointer by
420 reading the value from the register window save area. */
421 #ifdef RETURN_ADDR_IN_PREVIOUS_FRAME
422 if (fndecl_code == BUILT_IN_RETURN_ADDRESS)
426 /* Scan back COUNT frames to the specified frame. */
427 for (i = 0; i < count; i++)
429 /* Assume the dynamic chain pointer is in the word that the
430 frame address points to, unless otherwise specified. */
431 #ifdef DYNAMIC_CHAIN_ADDRESS
432 tem = DYNAMIC_CHAIN_ADDRESS (tem);
434 tem = memory_address (Pmode, tem);
435 tem = gen_rtx_MEM (Pmode, tem);
436 MEM_ALIAS_SET (tem) = get_frame_alias_set ();
437 tem = copy_to_reg (tem);
440 /* For __builtin_frame_address, return what we've got. */
441 if (fndecl_code == BUILT_IN_FRAME_ADDRESS)
444 /* For __builtin_return_address, Get the return address from that
446 #ifdef RETURN_ADDR_RTX
447 tem = RETURN_ADDR_RTX (count, tem);
449 tem = memory_address (Pmode,
450 plus_constant (tem, GET_MODE_SIZE (Pmode)));
451 tem = gen_rtx_MEM (Pmode, tem);
452 MEM_ALIAS_SET (tem) = get_frame_alias_set ();
457 /* Alias set used for setjmp buffer. */
458 static HOST_WIDE_INT setjmp_alias_set = -1;
460 /* Construct the leading half of a __builtin_setjmp call. Control will
461 return to RECEIVER_LABEL. This is used directly by sjlj exception
465 expand_builtin_setjmp_setup (buf_addr, receiver_label)
469 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
473 if (setjmp_alias_set == -1)
474 setjmp_alias_set = new_alias_set ();
476 #ifdef POINTERS_EXTEND_UNSIGNED
477 buf_addr = convert_memory_address (Pmode, buf_addr);
480 buf_addr = force_reg (Pmode, force_operand (buf_addr, NULL_RTX));
484 /* We store the frame pointer and the address of receiver_label in
485 the buffer and use the rest of it for the stack save area, which
486 is machine-dependent. */
488 #ifndef BUILTIN_SETJMP_FRAME_VALUE
489 #define BUILTIN_SETJMP_FRAME_VALUE virtual_stack_vars_rtx
492 mem = gen_rtx_MEM (Pmode, buf_addr);
493 MEM_ALIAS_SET (mem) = setjmp_alias_set;
494 emit_move_insn (mem, BUILTIN_SETJMP_FRAME_VALUE);
496 mem = gen_rtx_MEM (Pmode, plus_constant (buf_addr, GET_MODE_SIZE (Pmode))),
497 MEM_ALIAS_SET (mem) = setjmp_alias_set;
499 emit_move_insn (validize_mem (mem),
500 force_reg (Pmode, gen_rtx_LABEL_REF (Pmode, receiver_label)));
502 stack_save = gen_rtx_MEM (sa_mode,
503 plus_constant (buf_addr,
504 2 * GET_MODE_SIZE (Pmode)));
505 MEM_ALIAS_SET (stack_save) = setjmp_alias_set;
506 emit_stack_save (SAVE_NONLOCAL, &stack_save, NULL_RTX);
508 /* If there is further processing to do, do it. */
509 #ifdef HAVE_builtin_setjmp_setup
510 if (HAVE_builtin_setjmp_setup)
511 emit_insn (gen_builtin_setjmp_setup (buf_addr));
514 /* Tell optimize_save_area_alloca that extra work is going to
515 need to go on during alloca. */
516 current_function_calls_setjmp = 1;
518 /* Set this so all the registers get saved in our frame; we need to be
519 able to copy the saved values for any registers from frames we unwind. */
520 current_function_has_nonlocal_label = 1;
523 /* Construct the trailing part of a __builtin_setjmp call.
524 This is used directly by sjlj exception handling code. */
527 expand_builtin_setjmp_receiver (receiver_label)
528 rtx receiver_label ATTRIBUTE_UNUSED;
530 /* Clobber the FP when we get here, so we have to make sure it's
531 marked as used by this function. */
532 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
534 /* Mark the static chain as clobbered here so life information
535 doesn't get messed up for it. */
536 emit_insn (gen_rtx_CLOBBER (VOIDmode, static_chain_rtx));
538 /* Now put in the code to restore the frame pointer, and argument
539 pointer, if needed. The code below is from expand_end_bindings
540 in stmt.c; see detailed documentation there. */
541 #ifdef HAVE_nonlocal_goto
542 if (! HAVE_nonlocal_goto)
544 emit_move_insn (virtual_stack_vars_rtx, hard_frame_pointer_rtx);
546 #if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
547 if (fixed_regs[ARG_POINTER_REGNUM])
549 #ifdef ELIMINABLE_REGS
551 static struct elims {int from, to;} elim_regs[] = ELIMINABLE_REGS;
553 for (i = 0; i < ARRAY_SIZE (elim_regs); i++)
554 if (elim_regs[i].from == ARG_POINTER_REGNUM
555 && elim_regs[i].to == HARD_FRAME_POINTER_REGNUM)
558 if (i == ARRAY_SIZE (elim_regs))
561 /* Now restore our arg pointer from the address at which it
562 was saved in our stack frame.
563 If there hasn't be space allocated for it yet, make
565 if (arg_pointer_save_area == 0)
566 arg_pointer_save_area
567 = assign_stack_local (Pmode, GET_MODE_SIZE (Pmode), 0);
568 emit_move_insn (virtual_incoming_args_rtx,
569 copy_to_reg (arg_pointer_save_area));
574 #ifdef HAVE_builtin_setjmp_receiver
575 if (HAVE_builtin_setjmp_receiver)
576 emit_insn (gen_builtin_setjmp_receiver (receiver_label));
579 #ifdef HAVE_nonlocal_goto_receiver
580 if (HAVE_nonlocal_goto_receiver)
581 emit_insn (gen_nonlocal_goto_receiver ());
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 ();
718 GET_CODE (insn) != JUMP_INSN;
719 insn = PREV_INSN (insn))
721 REG_NOTES (insn) = alloc_EXPR_LIST (REG_NON_LOCAL_GOTO, const0_rtx,
725 /* Get a MEM rtx for expression EXP which is the address of an operand
726 to be used to be used in a string instruction (cmpstrsi, movstrsi, ..). */
732 rtx mem = gen_rtx_MEM (BLKmode,
733 memory_address (BLKmode,
734 expand_expr (exp, NULL_RTX,
735 ptr_mode, EXPAND_SUM)));
737 /* Get an expression we can use to find the attributes to assign to MEM.
738 If it is an ADDR_EXPR, use the operand. Otherwise, dereference it if
739 we can. First remove any nops. */
740 while ((TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
741 || TREE_CODE (exp) == NON_LVALUE_EXPR)
742 && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (exp, 0))))
743 exp = TREE_OPERAND (exp, 0);
745 if (TREE_CODE (exp) == ADDR_EXPR)
746 exp = TREE_OPERAND (exp, 0);
747 else if (POINTER_TYPE_P (TREE_TYPE (exp)))
748 exp = build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (exp)), exp);
752 set_mem_attributes (mem, exp, 0);
754 /* memcpy, memset and other builtin stringops can alias with anything. */
755 MEM_ALIAS_SET (mem) = 0;
759 /* Built-in functions to perform an untyped call and return. */
761 /* For each register that may be used for calling a function, this
762 gives a mode used to copy the register's value. VOIDmode indicates
763 the register is not used for calling a function. If the machine
764 has register windows, this gives only the outbound registers.
765 INCOMING_REGNO gives the corresponding inbound register. */
766 static enum machine_mode apply_args_mode[FIRST_PSEUDO_REGISTER];
768 /* For each register that may be used for returning values, this gives
769 a mode used to copy the register's value. VOIDmode indicates the
770 register is not used for returning values. If the machine has
771 register windows, this gives only the outbound registers.
772 INCOMING_REGNO gives the corresponding inbound register. */
773 static enum machine_mode apply_result_mode[FIRST_PSEUDO_REGISTER];
775 /* For each register that may be used for calling a function, this
776 gives the offset of that register into the block returned by
777 __builtin_apply_args. 0 indicates that the register is not
778 used for calling a function. */
779 static int apply_args_reg_offset[FIRST_PSEUDO_REGISTER];
781 /* Return the offset of register REGNO into the block returned by
782 __builtin_apply_args. This is not declared static, since it is
783 needed in objc-act.c. */
786 apply_args_register_offset (regno)
791 /* Arguments are always put in outgoing registers (in the argument
792 block) if such make sense. */
793 #ifdef OUTGOING_REGNO
794 regno = OUTGOING_REGNO(regno);
796 return apply_args_reg_offset[regno];
799 /* Return the size required for the block returned by __builtin_apply_args,
800 and initialize apply_args_mode. */
805 static int size = -1;
807 enum machine_mode mode;
809 /* The values computed by this function never change. */
812 /* The first value is the incoming arg-pointer. */
813 size = GET_MODE_SIZE (Pmode);
815 /* The second value is the structure value address unless this is
816 passed as an "invisible" first argument. */
817 if (struct_value_rtx)
818 size += GET_MODE_SIZE (Pmode);
820 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
821 if (FUNCTION_ARG_REGNO_P (regno))
823 /* Search for the proper mode for copying this register's
824 value. I'm not sure this is right, but it works so far. */
825 enum machine_mode best_mode = VOIDmode;
827 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
829 mode = GET_MODE_WIDER_MODE (mode))
830 if (HARD_REGNO_MODE_OK (regno, mode)
831 && HARD_REGNO_NREGS (regno, mode) == 1)
834 if (best_mode == VOIDmode)
835 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
837 mode = GET_MODE_WIDER_MODE (mode))
838 if (HARD_REGNO_MODE_OK (regno, mode)
839 && (mov_optab->handlers[(int) mode].insn_code
840 != CODE_FOR_nothing))
844 if (mode == VOIDmode)
847 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
848 if (size % align != 0)
849 size = CEIL (size, align) * align;
850 apply_args_reg_offset[regno] = size;
851 size += GET_MODE_SIZE (mode);
852 apply_args_mode[regno] = mode;
856 apply_args_mode[regno] = VOIDmode;
857 apply_args_reg_offset[regno] = 0;
863 /* Return the size required for the block returned by __builtin_apply,
864 and initialize apply_result_mode. */
869 static int size = -1;
871 enum machine_mode mode;
873 /* The values computed by this function never change. */
878 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
879 if (FUNCTION_VALUE_REGNO_P (regno))
881 /* Search for the proper mode for copying this register's
882 value. I'm not sure this is right, but it works so far. */
883 enum machine_mode best_mode = VOIDmode;
885 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
887 mode = GET_MODE_WIDER_MODE (mode))
888 if (HARD_REGNO_MODE_OK (regno, mode))
891 if (best_mode == VOIDmode)
892 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
894 mode = GET_MODE_WIDER_MODE (mode))
895 if (HARD_REGNO_MODE_OK (regno, mode)
896 && (mov_optab->handlers[(int) mode].insn_code
897 != CODE_FOR_nothing))
901 if (mode == VOIDmode)
904 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
905 if (size % align != 0)
906 size = CEIL (size, align) * align;
907 size += GET_MODE_SIZE (mode);
908 apply_result_mode[regno] = mode;
911 apply_result_mode[regno] = VOIDmode;
913 /* Allow targets that use untyped_call and untyped_return to override
914 the size so that machine-specific information can be stored here. */
915 #ifdef APPLY_RESULT_SIZE
916 size = APPLY_RESULT_SIZE;
922 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
923 /* Create a vector describing the result block RESULT. If SAVEP is true,
924 the result block is used to save the values; otherwise it is used to
925 restore the values. */
928 result_vector (savep, result)
932 int regno, size, align, nelts;
933 enum machine_mode mode;
935 rtx *savevec = (rtx *) alloca (FIRST_PSEUDO_REGISTER * sizeof (rtx));
938 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
939 if ((mode = apply_result_mode[regno]) != VOIDmode)
941 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
942 if (size % align != 0)
943 size = CEIL (size, align) * align;
944 reg = gen_rtx_REG (mode, savep ? regno : INCOMING_REGNO (regno));
945 mem = change_address (result, mode,
946 plus_constant (XEXP (result, 0), size));
947 savevec[nelts++] = (savep
948 ? gen_rtx_SET (VOIDmode, mem, reg)
949 : gen_rtx_SET (VOIDmode, reg, mem));
950 size += GET_MODE_SIZE (mode);
952 return gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (nelts, savevec));
954 #endif /* HAVE_untyped_call or HAVE_untyped_return */
956 /* Save the state required to perform an untyped call with the same
957 arguments as were passed to the current function. */
960 expand_builtin_apply_args_1 ()
963 int size, align, regno;
964 enum machine_mode mode;
966 /* Create a block where the arg-pointer, structure value address,
967 and argument registers can be saved. */
968 registers = assign_stack_local (BLKmode, apply_args_size (), -1);
970 /* Walk past the arg-pointer and structure value address. */
971 size = GET_MODE_SIZE (Pmode);
972 if (struct_value_rtx)
973 size += GET_MODE_SIZE (Pmode);
975 /* Save each register used in calling a function to the block. */
976 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
977 if ((mode = apply_args_mode[regno]) != VOIDmode)
981 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
982 if (size % align != 0)
983 size = CEIL (size, align) * align;
985 tem = gen_rtx_REG (mode, INCOMING_REGNO (regno));
987 emit_move_insn (change_address (registers, mode,
988 plus_constant (XEXP (registers, 0),
991 size += GET_MODE_SIZE (mode);
994 /* Save the arg pointer to the block. */
995 emit_move_insn (change_address (registers, Pmode, XEXP (registers, 0)),
996 copy_to_reg (virtual_incoming_args_rtx));
997 size = GET_MODE_SIZE (Pmode);
999 /* Save the structure value address unless this is passed as an
1000 "invisible" first argument. */
1001 if (struct_value_incoming_rtx)
1003 emit_move_insn (change_address (registers, Pmode,
1004 plus_constant (XEXP (registers, 0),
1006 copy_to_reg (struct_value_incoming_rtx));
1007 size += GET_MODE_SIZE (Pmode);
1010 /* Return the address of the block. */
1011 return copy_addr_to_reg (XEXP (registers, 0));
1014 /* __builtin_apply_args returns block of memory allocated on
1015 the stack into which is stored the arg pointer, structure
1016 value address, static chain, and all the registers that might
1017 possibly be used in performing a function call. The code is
1018 moved to the start of the function so the incoming values are
1021 expand_builtin_apply_args ()
1023 /* Don't do __builtin_apply_args more than once in a function.
1024 Save the result of the first call and reuse it. */
1025 if (apply_args_value != 0)
1026 return apply_args_value;
1028 /* When this function is called, it means that registers must be
1029 saved on entry to this function. So we migrate the
1030 call to the first insn of this function. */
1035 temp = expand_builtin_apply_args_1 ();
1039 apply_args_value = temp;
1041 /* Put the sequence after the NOTE that starts the function.
1042 If this is inside a SEQUENCE, make the outer-level insn
1043 chain current, so the code is placed at the start of the
1045 push_topmost_sequence ();
1046 emit_insns_before (seq, NEXT_INSN (get_insns ()));
1047 pop_topmost_sequence ();
1052 /* Perform an untyped call and save the state required to perform an
1053 untyped return of whatever value was returned by the given function. */
1056 expand_builtin_apply (function, arguments, argsize)
1057 rtx function, arguments, argsize;
1059 int size, align, regno;
1060 enum machine_mode mode;
1061 rtx incoming_args, result, reg, dest, call_insn;
1062 rtx old_stack_level = 0;
1063 rtx call_fusage = 0;
1065 /* Create a block where the return registers can be saved. */
1066 result = assign_stack_local (BLKmode, apply_result_size (), -1);
1068 /* Fetch the arg pointer from the ARGUMENTS block. */
1069 incoming_args = gen_reg_rtx (Pmode);
1070 emit_move_insn (incoming_args,
1071 gen_rtx_MEM (Pmode, arguments));
1072 #ifndef STACK_GROWS_DOWNWARD
1073 incoming_args = expand_binop (Pmode, sub_optab, incoming_args, argsize,
1074 incoming_args, 0, OPTAB_LIB_WIDEN);
1077 /* Perform postincrements before actually calling the function. */
1080 /* Push a new argument block and copy the arguments. Do not allow
1081 the (potential) memcpy call below to interfere with our stack
1083 do_pending_stack_adjust ();
1086 /* Save the stack with nonlocal if available */
1087 #ifdef HAVE_save_stack_nonlocal
1088 if (HAVE_save_stack_nonlocal)
1089 emit_stack_save (SAVE_NONLOCAL, &old_stack_level, NULL_RTX);
1092 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
1094 /* Push a block of memory onto the stack to store the memory arguments.
1095 Save the address in a register, and copy the memory arguments. ??? I
1096 haven't figured out how the calling convention macros effect this,
1097 but it's likely that the source and/or destination addresses in
1098 the block copy will need updating in machine specific ways. */
1099 dest = allocate_dynamic_stack_space (argsize, 0, BITS_PER_UNIT);
1100 emit_block_move (gen_rtx_MEM (BLKmode, dest),
1101 gen_rtx_MEM (BLKmode, incoming_args),
1102 argsize, PARM_BOUNDARY);
1104 /* Refer to the argument block. */
1106 arguments = gen_rtx_MEM (BLKmode, arguments);
1108 /* Walk past the arg-pointer and structure value address. */
1109 size = GET_MODE_SIZE (Pmode);
1110 if (struct_value_rtx)
1111 size += GET_MODE_SIZE (Pmode);
1113 /* Restore each of the registers previously saved. Make USE insns
1114 for each of these registers for use in making the call. */
1115 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1116 if ((mode = apply_args_mode[regno]) != VOIDmode)
1118 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1119 if (size % align != 0)
1120 size = CEIL (size, align) * align;
1121 reg = gen_rtx_REG (mode, regno);
1122 emit_move_insn (reg,
1123 change_address (arguments, mode,
1124 plus_constant (XEXP (arguments, 0),
1127 use_reg (&call_fusage, reg);
1128 size += GET_MODE_SIZE (mode);
1131 /* Restore the structure value address unless this is passed as an
1132 "invisible" first argument. */
1133 size = GET_MODE_SIZE (Pmode);
1134 if (struct_value_rtx)
1136 rtx value = gen_reg_rtx (Pmode);
1137 emit_move_insn (value,
1138 change_address (arguments, Pmode,
1139 plus_constant (XEXP (arguments, 0),
1141 emit_move_insn (struct_value_rtx, value);
1142 if (GET_CODE (struct_value_rtx) == REG)
1143 use_reg (&call_fusage, struct_value_rtx);
1144 size += GET_MODE_SIZE (Pmode);
1147 /* All arguments and registers used for the call are set up by now! */
1148 function = prepare_call_address (function, NULL_TREE, &call_fusage, 0);
1150 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
1151 and we don't want to load it into a register as an optimization,
1152 because prepare_call_address already did it if it should be done. */
1153 if (GET_CODE (function) != SYMBOL_REF)
1154 function = memory_address (FUNCTION_MODE, function);
1156 /* Generate the actual call instruction and save the return value. */
1157 #ifdef HAVE_untyped_call
1158 if (HAVE_untyped_call)
1159 emit_call_insn (gen_untyped_call (gen_rtx_MEM (FUNCTION_MODE, function),
1160 result, result_vector (1, result)));
1163 #ifdef HAVE_call_value
1164 if (HAVE_call_value)
1168 /* Locate the unique return register. It is not possible to
1169 express a call that sets more than one return register using
1170 call_value; use untyped_call for that. In fact, untyped_call
1171 only needs to save the return registers in the given block. */
1172 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1173 if ((mode = apply_result_mode[regno]) != VOIDmode)
1176 abort (); /* HAVE_untyped_call required. */
1177 valreg = gen_rtx_REG (mode, regno);
1180 emit_call_insn (GEN_CALL_VALUE (valreg,
1181 gen_rtx_MEM (FUNCTION_MODE, function),
1182 const0_rtx, NULL_RTX, const0_rtx));
1184 emit_move_insn (change_address (result, GET_MODE (valreg),
1192 /* Find the CALL insn we just emitted. */
1193 for (call_insn = get_last_insn ();
1194 call_insn && GET_CODE (call_insn) != CALL_INSN;
1195 call_insn = PREV_INSN (call_insn))
1201 /* Put the register usage information on the CALL. If there is already
1202 some usage information, put ours at the end. */
1203 if (CALL_INSN_FUNCTION_USAGE (call_insn))
1207 for (link = CALL_INSN_FUNCTION_USAGE (call_insn); XEXP (link, 1) != 0;
1208 link = XEXP (link, 1))
1211 XEXP (link, 1) = call_fusage;
1214 CALL_INSN_FUNCTION_USAGE (call_insn) = call_fusage;
1216 /* Restore the stack. */
1217 #ifdef HAVE_save_stack_nonlocal
1218 if (HAVE_save_stack_nonlocal)
1219 emit_stack_restore (SAVE_NONLOCAL, old_stack_level, NULL_RTX);
1222 emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX);
1226 /* Return the address of the result block. */
1227 return copy_addr_to_reg (XEXP (result, 0));
1230 /* Perform an untyped return. */
1233 expand_builtin_return (result)
1236 int size, align, regno;
1237 enum machine_mode mode;
1239 rtx call_fusage = 0;
1241 apply_result_size ();
1242 result = gen_rtx_MEM (BLKmode, result);
1244 #ifdef HAVE_untyped_return
1245 if (HAVE_untyped_return)
1247 emit_jump_insn (gen_untyped_return (result, result_vector (0, result)));
1253 /* Restore the return value and note that each value is used. */
1255 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1256 if ((mode = apply_result_mode[regno]) != VOIDmode)
1258 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1259 if (size % align != 0)
1260 size = CEIL (size, align) * align;
1261 reg = gen_rtx_REG (mode, INCOMING_REGNO (regno));
1262 emit_move_insn (reg,
1263 change_address (result, mode,
1264 plus_constant (XEXP (result, 0),
1267 push_to_sequence (call_fusage);
1268 emit_insn (gen_rtx_USE (VOIDmode, reg));
1269 call_fusage = get_insns ();
1271 size += GET_MODE_SIZE (mode);
1274 /* Put the USE insns before the return. */
1275 emit_insns (call_fusage);
1277 /* Return whatever values was restored by jumping directly to the end
1279 expand_null_return ();
1282 /* Expand a call to __builtin_classify_type with arguments found in
1285 expand_builtin_classify_type (arglist)
1290 tree type = TREE_TYPE (TREE_VALUE (arglist));
1291 enum tree_code code = TREE_CODE (type);
1292 if (code == VOID_TYPE)
1293 return GEN_INT (void_type_class);
1294 if (code == INTEGER_TYPE)
1295 return GEN_INT (integer_type_class);
1296 if (code == CHAR_TYPE)
1297 return GEN_INT (char_type_class);
1298 if (code == ENUMERAL_TYPE)
1299 return GEN_INT (enumeral_type_class);
1300 if (code == BOOLEAN_TYPE)
1301 return GEN_INT (boolean_type_class);
1302 if (code == POINTER_TYPE)
1303 return GEN_INT (pointer_type_class);
1304 if (code == REFERENCE_TYPE)
1305 return GEN_INT (reference_type_class);
1306 if (code == OFFSET_TYPE)
1307 return GEN_INT (offset_type_class);
1308 if (code == REAL_TYPE)
1309 return GEN_INT (real_type_class);
1310 if (code == COMPLEX_TYPE)
1311 return GEN_INT (complex_type_class);
1312 if (code == FUNCTION_TYPE)
1313 return GEN_INT (function_type_class);
1314 if (code == METHOD_TYPE)
1315 return GEN_INT (method_type_class);
1316 if (code == RECORD_TYPE)
1317 return GEN_INT (record_type_class);
1318 if (code == UNION_TYPE || code == QUAL_UNION_TYPE)
1319 return GEN_INT (union_type_class);
1320 if (code == ARRAY_TYPE)
1322 if (TYPE_STRING_FLAG (type))
1323 return GEN_INT (string_type_class);
1325 return GEN_INT (array_type_class);
1327 if (code == SET_TYPE)
1328 return GEN_INT (set_type_class);
1329 if (code == FILE_TYPE)
1330 return GEN_INT (file_type_class);
1331 if (code == LANG_TYPE)
1332 return GEN_INT (lang_type_class);
1334 return GEN_INT (no_type_class);
1337 /* Expand expression EXP, which is a call to __builtin_constant_p. */
1339 expand_builtin_constant_p (exp)
1342 tree arglist = TREE_OPERAND (exp, 1);
1343 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1348 arglist = TREE_VALUE (arglist);
1350 /* We have taken care of the easy cases during constant folding. This
1351 case is not obvious, so emit (constant_p_rtx (ARGLIST)) and let CSE get a
1352 chance to see if it can deduce whether ARGLIST is constant. */
1354 tmp = expand_expr (arglist, NULL_RTX, VOIDmode, 0);
1355 tmp = gen_rtx_CONSTANT_P_RTX (value_mode, tmp);
1359 /* Expand a call to one of the builtin math functions (sin, cos, or sqrt).
1360 Return 0 if a normal call should be emitted rather than expanding the
1361 function in-line. EXP is the expression that is a call to the builtin
1362 function; if convenient, the result should be placed in TARGET.
1363 SUBTARGET may be used as the target for computing one of EXP's operands. */
1365 expand_builtin_mathfn (exp, target, subtarget)
1367 rtx target, subtarget;
1369 optab builtin_optab;
1371 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
1372 tree arglist = TREE_OPERAND (exp, 1);
1374 if (!validate_arglist (arglist, REAL_TYPE, VOID_TYPE))
1377 /* Stabilize and compute the argument. */
1378 if (TREE_CODE (TREE_VALUE (arglist)) != VAR_DECL
1379 && TREE_CODE (TREE_VALUE (arglist)) != PARM_DECL)
1381 exp = copy_node (exp);
1382 TREE_OPERAND (exp, 1) = arglist;
1383 /* Wrap the computation of the argument in a SAVE_EXPR. That
1384 way, if we need to expand the argument again (as in the
1385 flag_errno_math case below where we cannot directly set
1386 errno), we will not perform side-effects more than once.
1387 Note that here we're mutating the original EXP as well as the
1388 copy; that's the right thing to do in case the original EXP
1389 is expanded later. */
1390 TREE_VALUE (arglist) = save_expr (TREE_VALUE (arglist));
1391 arglist = copy_node (arglist);
1393 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
1395 /* Make a suitable register to place result in. */
1396 target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));
1401 switch (DECL_FUNCTION_CODE (fndecl))
1404 builtin_optab = sin_optab; break;
1406 builtin_optab = cos_optab; break;
1407 case BUILT_IN_FSQRT:
1408 builtin_optab = sqrt_optab; break;
1413 /* Compute into TARGET.
1414 Set TARGET to wherever the result comes back. */
1415 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
1416 builtin_optab, op0, target, 0);
1418 /* If we were unable to expand via the builtin, stop the
1419 sequence (without outputting the insns) and return 0, causing
1420 a call to the library function. */
1427 /* Check the results by default. But if flag_fast_math is turned on,
1428 then assume sqrt will always be called with valid arguments. */
1430 if (flag_errno_math && ! flag_fast_math)
1434 /* Don't define the builtin FP instructions
1435 if your machine is not IEEE. */
1436 if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT)
1439 lab1 = gen_label_rtx ();
1441 /* Test the result; if it is NaN, set errno=EDOM because
1442 the argument was not in the domain. */
1443 emit_cmp_and_jump_insns (target, target, EQ, 0, GET_MODE (target),
1448 #ifdef GEN_ERRNO_RTX
1449 rtx errno_rtx = GEN_ERRNO_RTX;
1452 = gen_rtx_MEM (word_mode, gen_rtx_SYMBOL_REF (Pmode, "errno"));
1455 emit_move_insn (errno_rtx, GEN_INT (TARGET_EDOM));
1458 /* We can't set errno=EDOM directly; let the library call do it.
1459 Pop the arguments right away in case the call gets deleted. */
1461 expand_call (exp, target, 0);
1468 /* Output the entire sequence. */
1469 insns = get_insns ();
1476 /* Expand expression EXP which is a call to the strlen builtin. Return 0
1477 if we failed the caller should emit a normal call, otherwise
1478 try to get the result in TARGET, if convenient. */
1481 expand_builtin_strlen (exp, target)
1485 tree arglist = TREE_OPERAND (exp, 1);
1486 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1488 if (!validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
1493 tree src = TREE_VALUE (arglist);
1496 = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1498 rtx result, src_reg, char_rtx, before_strlen;
1499 enum machine_mode insn_mode = value_mode, char_mode;
1500 enum insn_code icode = CODE_FOR_nothing;
1502 /* If SRC is not a pointer type, don't do this operation inline. */
1506 /* Bail out if we can't compute strlen in the right mode. */
1507 while (insn_mode != VOIDmode)
1509 icode = strlen_optab->handlers[(int) insn_mode].insn_code;
1510 if (icode != CODE_FOR_nothing)
1513 insn_mode = GET_MODE_WIDER_MODE (insn_mode);
1515 if (insn_mode == VOIDmode)
1518 /* Make a place to write the result of the instruction. */
1521 && GET_CODE (result) == REG
1522 && GET_MODE (result) == insn_mode
1523 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
1524 result = gen_reg_rtx (insn_mode);
1526 /* Make a place to hold the source address. We will not expand
1527 the actual source until we are sure that the expansion will
1528 not fail -- there are trees that cannot be expanded twice. */
1529 src_reg = gen_reg_rtx (Pmode);
1531 /* Mark the beginning of the strlen sequence so we can emit the
1532 source operand later. */
1533 before_strlen = get_last_insn();
1535 /* Check the string is readable and has an end. */
1536 if (current_function_check_memory_usage)
1537 emit_library_call (chkr_check_str_libfunc, LCT_CONST_MAKE_BLOCK,
1538 VOIDmode, 2, src_reg, Pmode,
1539 GEN_INT (MEMORY_USE_RO),
1540 TYPE_MODE (integer_type_node));
1542 char_rtx = const0_rtx;
1543 char_mode = insn_data[(int) icode].operand[2].mode;
1544 if (! (*insn_data[(int) icode].operand[2].predicate) (char_rtx,
1546 char_rtx = copy_to_mode_reg (char_mode, char_rtx);
1548 pat = GEN_FCN (icode) (result, gen_rtx_MEM (BLKmode, src_reg),
1549 char_rtx, GEN_INT (align));
1554 /* Now that we are assured of success, expand the source. */
1556 pat = memory_address (BLKmode,
1557 expand_expr (src, src_reg, ptr_mode, EXPAND_SUM));
1559 emit_move_insn (src_reg, pat);
1560 pat = gen_sequence ();
1564 emit_insn_after (pat, before_strlen);
1566 emit_insn_before (pat, get_insns ());
1568 /* Return the value in the proper mode for this function. */
1569 if (GET_MODE (result) == value_mode)
1571 else if (target != 0)
1572 convert_move (target, result, 0);
1574 target = convert_to_mode (value_mode, result, 0);
1580 /* Expand a call to the strstr builtin. Return 0 if we failed the
1581 caller should emit a normal call, otherwise try to get the result
1582 in TARGET, if convenient (and in mode MODE if that's convenient). */
1585 expand_builtin_strstr (arglist, target, mode)
1588 enum machine_mode mode;
1590 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
1591 || current_function_check_memory_usage)
1595 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1597 const char *p1, *p2;
1606 const char *r = strstr (p1, p2);
1611 /* Return an offset into the constant string argument. */
1612 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1613 s1, ssize_int (r - p1))),
1614 target, mode, EXPAND_NORMAL);
1618 return expand_expr (s1, target, mode, EXPAND_NORMAL);
1623 fn = built_in_decls[BUILT_IN_STRCHR];
1627 /* New argument list transforming strstr(s1, s2) to
1628 strchr(s1, s2[0]). */
1630 build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
1631 arglist = tree_cons (NULL_TREE, s1, arglist);
1632 return expand_expr (build_function_call_expr (fn, arglist),
1633 target, mode, EXPAND_NORMAL);
1637 /* Expand a call to the strchr builtin. Return 0 if we failed the
1638 caller should emit a normal call, otherwise try to get the result
1639 in TARGET, if convenient (and in mode MODE if that's convenient). */
1642 expand_builtin_strchr (arglist, target, mode)
1645 enum machine_mode mode;
1647 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
1648 || current_function_check_memory_usage)
1652 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1655 if (TREE_CODE (s2) != INTEGER_CST)
1664 if (target_char_cast (s2, &c))
1672 /* Return an offset into the constant string argument. */
1673 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1674 s1, ssize_int (r - p1))),
1675 target, mode, EXPAND_NORMAL);
1678 /* FIXME: Should use here strchrM optab so that ports can optimize
1684 /* Expand a call to the strrchr builtin. Return 0 if we failed the
1685 caller should emit a normal call, otherwise try to get the result
1686 in TARGET, if convenient (and in mode MODE if that's convenient). */
1689 expand_builtin_strrchr (arglist, target, mode)
1692 enum machine_mode mode;
1694 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
1695 || current_function_check_memory_usage)
1699 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1703 if (TREE_CODE (s2) != INTEGER_CST)
1712 if (target_char_cast (s2, &c))
1715 r = strrchr (p1, c);
1720 /* Return an offset into the constant string argument. */
1721 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1722 s1, ssize_int (r - p1))),
1723 target, mode, EXPAND_NORMAL);
1726 if (! integer_zerop (s2))
1729 fn = built_in_decls[BUILT_IN_STRCHR];
1733 /* Transform strrchr(s1, '\0') to strchr(s1, '\0'). */
1734 return expand_expr (build_function_call_expr (fn, arglist),
1735 target, mode, EXPAND_NORMAL);
1739 /* Expand a call to the strpbrk builtin. Return 0 if we failed the
1740 caller should emit a normal call, otherwise try to get the result
1741 in TARGET, if convenient (and in mode MODE if that's convenient). */
1744 expand_builtin_strpbrk (arglist, target, mode)
1747 enum machine_mode mode;
1749 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
1750 || current_function_check_memory_usage)
1754 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1756 const char *p1, *p2;
1765 const char *r = strpbrk (p1, p2);
1770 /* Return an offset into the constant string argument. */
1771 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1772 s1, ssize_int (r - p1))),
1773 target, mode, EXPAND_NORMAL);
1778 /* strpbrk(x, "") == NULL.
1779 Evaluate and ignore the arguments in case they had
1781 expand_expr (s1, const0_rtx, VOIDmode, EXPAND_NORMAL);
1786 return 0; /* Really call strpbrk. */
1788 fn = built_in_decls[BUILT_IN_STRCHR];
1792 /* New argument list transforming strpbrk(s1, s2) to
1793 strchr(s1, s2[0]). */
1795 build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
1796 arglist = tree_cons (NULL_TREE, s1, arglist);
1797 return expand_expr (build_function_call_expr (fn, arglist),
1798 target, mode, EXPAND_NORMAL);
1802 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1803 bytes from constant string DATA + OFFSET and return it as target
1807 builtin_memcpy_read_str (data, offset, mode)
1809 HOST_WIDE_INT offset;
1810 enum machine_mode mode;
1812 const char *str = (const char *) data;
1814 if (offset + GET_MODE_SIZE (mode) > strlen (str) + 1)
1815 abort (); /* Attempt to read past the end of constant string. */
1817 return c_readstr (str + offset, mode);
1820 /* Expand a call to the memcpy builtin, with arguments in ARGLIST. */
1822 expand_builtin_memcpy (arglist)
1825 if (!validate_arglist (arglist,
1826 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
1830 tree dest = TREE_VALUE (arglist);
1831 tree src = TREE_VALUE (TREE_CHAIN (arglist));
1832 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1833 const char *src_str;
1835 int src_align = get_pointer_alignment (src, BIGGEST_ALIGNMENT);
1836 int dest_align = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
1837 rtx dest_mem, src_mem, dest_addr, len_rtx;
1839 /* If either SRC or DEST is not a pointer type, don't do
1840 this operation in-line. */
1841 if (src_align == 0 || dest_align == 0)
1844 dest_mem = get_memory_rtx (dest);
1845 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
1846 src_str = c_getstr (src);
1848 /* If SRC is a string constant and block move would be done
1849 by pieces, we can avoid loading the string from memory
1850 and only stored the computed constants. */
1852 && !current_function_check_memory_usage
1853 && GET_CODE (len_rtx) == CONST_INT
1854 && (unsigned HOST_WIDE_INT) INTVAL (len_rtx) <= strlen (src_str) + 1
1855 && can_store_by_pieces (INTVAL (len_rtx), builtin_memcpy_read_str,
1856 (PTR) src_str, dest_align))
1858 store_by_pieces (dest_mem, INTVAL (len_rtx),
1859 builtin_memcpy_read_str,
1860 (PTR) src_str, dest_align);
1861 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
1864 src_mem = get_memory_rtx (src);
1866 /* Just copy the rights of SRC to the rights of DEST. */
1867 if (current_function_check_memory_usage)
1868 emit_library_call (chkr_copy_bitmap_libfunc, LCT_CONST_MAKE_BLOCK,
1869 VOIDmode, 3, XEXP (dest_mem, 0), Pmode,
1870 XEXP (src_mem, 0), Pmode,
1871 len_rtx, TYPE_MODE (sizetype));
1873 /* Copy word part most expediently. */
1875 = emit_block_move (dest_mem, src_mem, len_rtx,
1876 MIN (src_align, dest_align));
1879 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
1885 /* Expand expression EXP, which is a call to the strcpy builtin. Return 0
1886 if we failed the caller should emit a normal call. */
1889 expand_builtin_strcpy (exp)
1892 tree arglist = TREE_OPERAND (exp, 1);
1895 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
1899 tree len = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
1904 len = size_binop (PLUS_EXPR, len, ssize_int (1));
1905 chainon (arglist, build_tree_list (NULL_TREE, len));
1908 result = expand_builtin_memcpy (arglist);
1911 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
1915 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1916 bytes from constant string DATA + OFFSET and return it as target
1920 builtin_strncpy_read_str (data, offset, mode)
1922 HOST_WIDE_INT offset;
1923 enum machine_mode mode;
1925 const char *str = (const char *) data;
1927 if ((unsigned HOST_WIDE_INT) offset > strlen (str))
1930 return c_readstr (str + offset, mode);
1933 /* Expand expression EXP, which is a call to the strncpy builtin. Return 0
1934 if we failed the caller should emit a normal call. */
1937 expand_builtin_strncpy (arglist, target, mode)
1940 enum machine_mode mode;
1942 if (!validate_arglist (arglist,
1943 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
1947 tree slen = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
1948 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1950 /* We must be passed a constant len parameter. */
1951 if (TREE_CODE (len) != INTEGER_CST)
1954 /* If the len parameter is zero, return the dst parameter. */
1955 if (compare_tree_int (len, 0) == 0)
1957 /* Evaluate and ignore the src argument in case it has
1959 expand_expr (TREE_VALUE (TREE_CHAIN (arglist)), const0_rtx,
1960 VOIDmode, EXPAND_NORMAL);
1961 /* Return the dst parameter. */
1962 return expand_expr (TREE_VALUE (arglist), target, mode,
1966 /* Now, we must be passed a constant src ptr parameter. */
1967 if (slen == 0 || TREE_CODE (slen) != INTEGER_CST)
1970 slen = size_binop (PLUS_EXPR, slen, ssize_int (1));
1972 /* We're required to pad with trailing zeros if the requested
1973 len is greater than strlen(s2)+1. In that case try to
1974 use store_by_pieces, if it fails, punt. */
1975 if (tree_int_cst_lt (slen, len))
1977 tree dest = TREE_VALUE (arglist);
1978 int dest_align = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
1979 const char *p = c_getstr (TREE_VALUE (TREE_CHAIN (arglist)));
1982 if (!p || !dest_align || TREE_INT_CST_HIGH (len)
1983 || !can_store_by_pieces (TREE_INT_CST_LOW (len),
1984 builtin_strncpy_read_str,
1985 (PTR) p, dest_align))
1988 dest_mem = get_memory_rtx (dest);
1989 store_by_pieces (dest_mem, TREE_INT_CST_LOW (len),
1990 builtin_strncpy_read_str,
1991 (PTR) p, dest_align);
1992 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
1995 /* OK transform into builtin memcpy. */
1996 return expand_builtin_memcpy (arglist);
2000 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
2001 bytes from constant string DATA + OFFSET and return it as target
2005 builtin_memset_read_str (data, offset, mode)
2007 HOST_WIDE_INT offset ATTRIBUTE_UNUSED;
2008 enum machine_mode mode;
2010 const char *c = (const char *) data;
2011 char *p = alloca (GET_MODE_SIZE (mode));
2013 memset (p, *c, GET_MODE_SIZE (mode));
2015 return c_readstr (p, mode);
2018 /* Expand expression EXP, which is a call to the memset builtin. Return 0
2019 if we failed the caller should emit a normal call. */
2022 expand_builtin_memset (exp)
2025 tree arglist = TREE_OPERAND (exp, 1);
2027 if (!validate_arglist (arglist,
2028 POINTER_TYPE, INTEGER_TYPE, INTEGER_TYPE, VOID_TYPE))
2032 tree dest = TREE_VALUE (arglist);
2033 tree val = TREE_VALUE (TREE_CHAIN (arglist));
2034 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2037 int dest_align = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
2038 rtx dest_mem, dest_addr, len_rtx;
2040 /* If DEST is not a pointer type, don't do this
2041 operation in-line. */
2042 if (dest_align == 0)
2045 if (TREE_CODE (val) != INTEGER_CST)
2048 if (target_char_cast (val, &c))
2053 if (TREE_CODE (len) != INTEGER_CST || TREE_INT_CST_HIGH (len))
2055 if (current_function_check_memory_usage
2056 || !can_store_by_pieces (TREE_INT_CST_LOW (len),
2057 builtin_memset_read_str,
2058 (PTR) &c, dest_align))
2061 dest_mem = get_memory_rtx (dest);
2062 store_by_pieces (dest_mem, TREE_INT_CST_LOW (len),
2063 builtin_memset_read_str,
2064 (PTR) &c, dest_align);
2065 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
2068 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
2070 dest_mem = get_memory_rtx (dest);
2072 /* Just check DST is writable and mark it as readable. */
2073 if (current_function_check_memory_usage)
2074 emit_library_call (chkr_check_addr_libfunc, LCT_CONST_MAKE_BLOCK,
2075 VOIDmode, 3, XEXP (dest_mem, 0), Pmode,
2076 len_rtx, TYPE_MODE (sizetype),
2077 GEN_INT (MEMORY_USE_WO),
2078 TYPE_MODE (integer_type_node));
2081 dest_addr = clear_storage (dest_mem, len_rtx, dest_align);
2084 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
2090 /* Expand expression EXP, which is a call to the bzero builtin. Return 0
2091 if we failed the caller should emit a normal call. */
2093 expand_builtin_bzero (exp)
2096 tree arglist = TREE_OPERAND (exp, 1);
2097 tree dest, size, newarglist;
2100 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2103 dest = TREE_VALUE (arglist);
2104 size = TREE_VALUE (TREE_CHAIN (arglist));
2106 /* New argument list transforming bzero(ptr x, int y) to
2107 memset(ptr x, int 0, size_t y). */
2109 newarglist = build_tree_list (NULL_TREE, convert (sizetype, size));
2110 newarglist = tree_cons (NULL_TREE, integer_zero_node, newarglist);
2111 newarglist = tree_cons (NULL_TREE, dest, newarglist);
2113 TREE_OPERAND (exp, 1) = newarglist;
2114 result = expand_builtin_memset(exp);
2116 /* Always restore the original arguments. */
2117 TREE_OPERAND (exp, 1) = arglist;
2122 #ifdef HAVE_cmpstrsi
2123 /* Expand expression EXP, which is a call to the memcmp or the strcmp builtin.
2124 ARGLIST is the argument list for this call. Return 0 if we failed and the
2125 caller should emit a normal call, otherwise try to get the result in
2126 TARGET, if convenient. */
2128 expand_builtin_memcmp (exp, arglist, target)
2133 /* If we need to check memory accesses, call the library function. */
2134 if (current_function_check_memory_usage)
2137 if (!validate_arglist (arglist,
2138 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2142 enum machine_mode mode;
2143 tree arg1 = TREE_VALUE (arglist);
2144 tree arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2145 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2146 rtx arg1_rtx, arg2_rtx, arg3_rtx;
2151 = get_pointer_alignment (arg1, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
2153 = get_pointer_alignment (arg2, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
2154 enum machine_mode insn_mode
2155 = insn_data[(int) CODE_FOR_cmpstrsi].operand[0].mode;
2157 /* If we don't have POINTER_TYPE, call the function. */
2158 if (arg1_align == 0 || arg2_align == 0)
2161 /* Make a place to write the result of the instruction. */
2164 && GET_CODE (result) == REG && GET_MODE (result) == insn_mode
2165 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
2166 result = gen_reg_rtx (insn_mode);
2168 arg1_rtx = get_memory_rtx (arg1);
2169 arg2_rtx = get_memory_rtx (arg2);
2170 arg3_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
2174 insn = gen_cmpstrsi (result, arg1_rtx, arg2_rtx, arg3_rtx,
2175 GEN_INT (MIN (arg1_align, arg2_align)));
2180 emit_library_call_value (memcmp_libfunc, result, LCT_PURE_MAKE_BLOCK,
2181 TYPE_MODE (integer_type_node), 3,
2182 XEXP (arg1_rtx, 0), Pmode,
2183 XEXP (arg2_rtx, 0), Pmode,
2184 convert_to_mode (TYPE_MODE (sizetype), arg3_rtx,
2185 TREE_UNSIGNED (sizetype)),
2186 TYPE_MODE (sizetype));
2188 /* Return the value in the proper mode for this function. */
2189 mode = TYPE_MODE (TREE_TYPE (exp));
2190 if (GET_MODE (result) == mode)
2192 else if (target != 0)
2194 convert_move (target, result, 0);
2198 return convert_to_mode (mode, result, 0);
2203 /* Expand expression EXP, which is a call to the strcmp builtin. Return 0
2204 if we failed the caller should emit a normal call, otherwise try to get
2205 the result in TARGET, if convenient. */
2208 expand_builtin_strcmp (exp, target, mode)
2211 enum machine_mode mode;
2213 tree arglist = TREE_OPERAND (exp, 1);
2215 const char *p1, *p2;
2217 /* If we need to check memory accesses, call the library function. */
2218 if (current_function_check_memory_usage)
2221 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2224 arg1 = TREE_VALUE (arglist);
2225 arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2227 p1 = c_getstr (arg1);
2228 p2 = c_getstr (arg2);
2232 const int i = strcmp (p1, p2);
2233 return (i < 0 ? constm1_rtx : (i > 0 ? const1_rtx : const0_rtx));
2236 /* If either arg is "", return an expression corresponding to
2237 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
2238 if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
2240 tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
2241 tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
2243 fold (build1 (CONVERT_EXPR, integer_type_node,
2244 build1 (INDIRECT_REF, cst_uchar_node,
2245 build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
2247 fold (build1 (CONVERT_EXPR, integer_type_node,
2248 build1 (INDIRECT_REF, cst_uchar_node,
2249 build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
2250 tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
2251 return expand_expr (result, target, mode, EXPAND_NORMAL);
2254 #ifdef HAVE_cmpstrsi
2255 if (! HAVE_cmpstrsi)
2259 tree len = c_strlen (arg1);
2260 tree len2 = c_strlen (arg2);
2264 len = size_binop (PLUS_EXPR, ssize_int (1), len);
2267 len2 = size_binop (PLUS_EXPR, ssize_int (1), len2);
2269 /* If we don't have a constant length for the first, use the length
2270 of the second, if we know it. We don't require a constant for
2271 this case; some cost analysis could be done if both are available
2272 but neither is constant. For now, assume they're equally cheap
2273 unless one has side effects.
2275 If both strings have constant lengths, use the smaller. This
2276 could arise if optimization results in strcpy being called with
2277 two fixed strings, or if the code was machine-generated. We should
2278 add some code to the `memcmp' handler below to deal with such
2279 situations, someday. */
2281 if (!len || TREE_CODE (len) != INTEGER_CST)
2283 if (len2 && !TREE_SIDE_EFFECTS (len2))
2288 else if (len2 && TREE_CODE (len2) == INTEGER_CST
2289 && tree_int_cst_lt (len2, len))
2292 /* If both arguments have side effects, we cannot optimize. */
2293 if (TREE_SIDE_EFFECTS (len))
2296 chainon (arglist, build_tree_list (NULL_TREE, len));
2297 result = expand_builtin_memcmp (exp, arglist, target);
2299 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
2308 /* Expand expression EXP, which is a call to the strncmp builtin. Return 0
2309 if we failed the caller should emit a normal call, otherwise try to get
2310 the result in TARGET, if convenient. */
2312 expand_builtin_strncmp (exp, target, mode)
2315 enum machine_mode mode;
2317 tree arglist = TREE_OPERAND (exp, 1);
2318 tree arg1, arg2, arg3;
2319 const char *p1, *p2;
2321 /* If we need to check memory accesses, call the library function. */
2322 if (current_function_check_memory_usage)
2325 if (!validate_arglist (arglist,
2326 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2329 arg1 = TREE_VALUE (arglist);
2330 arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2331 arg3 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2333 /* We must be passed a constant len parameter. */
2334 if (TREE_CODE (arg3) != INTEGER_CST)
2337 /* If the len parameter is zero, return zero. */
2338 if (compare_tree_int (arg3, 0) == 0)
2340 /* Evaluate and ignore arg1 and arg2 in case they have
2342 expand_expr (arg1, const0_rtx, VOIDmode, EXPAND_NORMAL);
2343 expand_expr (arg2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2347 p1 = c_getstr (arg1);
2348 p2 = c_getstr (arg2);
2350 /* If all arguments are constant, evaluate at compile-time. */
2353 const int r = strncmp (p1, p2, TREE_INT_CST_LOW (arg3));
2354 return (r < 0 ? constm1_rtx : (r > 0 ? const1_rtx : const0_rtx));
2357 /* If len == 1 or (either string parameter is "" and (len >= 1)),
2358 return (*(u_char*)arg1 - *(u_char*)arg2). */
2359 if (compare_tree_int (arg3, 1) == 0
2360 || (compare_tree_int (arg3, 1) > 0
2361 && ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))))
2363 tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
2364 tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
2366 fold (build1 (CONVERT_EXPR, integer_type_node,
2367 build1 (INDIRECT_REF, cst_uchar_node,
2368 build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
2370 fold (build1 (CONVERT_EXPR, integer_type_node,
2371 build1 (INDIRECT_REF, cst_uchar_node,
2372 build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
2373 tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
2374 return expand_expr (result, target, mode, EXPAND_NORMAL);
2377 #ifdef HAVE_cmpstrsi
2378 /* If the length parameter is constant (checked above) and either
2379 string parameter is constant, call expand_builtin_memcmp() using
2380 a length parameter equal to the lesser of the given length and
2381 the strlen+1 of the constant string. */
2382 if (HAVE_cmpstrsi && (p1 || p2))
2384 /* Exactly one of the strings is constant at this point, because
2385 if both were then we'd have expanded this at compile-time. */
2386 tree string_len = p1 ? c_strlen (arg1) : c_strlen (arg2);
2388 string_len = size_binop (PLUS_EXPR, string_len, ssize_int (1));
2390 if (tree_int_cst_lt (string_len, arg3))
2392 /* The strlen+1 is strictly shorter, use it. */
2393 tree newarglist = build_tree_list (NULL_TREE, string_len);
2394 newarglist = tree_cons (NULL_TREE, arg2, newarglist);
2395 newarglist = tree_cons (NULL_TREE, arg1, newarglist);
2396 return expand_builtin_memcmp (exp, newarglist, target);
2399 return expand_builtin_memcmp (exp, arglist, target);
2406 /* Expand expression EXP, which is a call to the strcat builtin.
2407 Return 0 if we failed the caller should emit a normal call,
2408 otherwise try to get the result in TARGET, if convenient. */
2410 expand_builtin_strcat (arglist, target, mode)
2413 enum machine_mode mode;
2415 /* If we need to check memory accesses, call the library function. */
2416 if (current_function_check_memory_usage)
2419 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2423 tree dst = TREE_VALUE (arglist),
2424 src = TREE_VALUE (TREE_CHAIN (arglist));
2425 const char *p = c_getstr (src);
2427 /* If the string length is zero, return the dst parameter. */
2428 if (p && *p == '\0')
2429 return expand_expr (dst, target, mode, EXPAND_NORMAL);
2435 /* Expand expression EXP, which is a call to the strncat builtin.
2436 Return 0 if we failed the caller should emit a normal call,
2437 otherwise try to get the result in TARGET, if convenient. */
2439 expand_builtin_strncat (arglist, target, mode)
2442 enum machine_mode mode;
2444 /* If we need to check memory accesses, call the library function. */
2445 if (current_function_check_memory_usage)
2448 if (!validate_arglist (arglist,
2449 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2453 tree dst = TREE_VALUE (arglist),
2454 src = TREE_VALUE (TREE_CHAIN (arglist)),
2455 len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2456 const char *p = c_getstr (src);
2458 /* If the requested length is zero, or the src parameter string
2459 length is zero, return the dst parameter. */
2460 if ((TREE_CODE (len) == INTEGER_CST && compare_tree_int (len, 0) == 0)
2461 || (p && *p == '\0'))
2463 /* Evaluate and ignore the src and len parameters in case
2464 they have side-effects. */
2465 expand_expr (src, const0_rtx, VOIDmode, EXPAND_NORMAL);
2466 expand_expr (len, const0_rtx, VOIDmode, EXPAND_NORMAL);
2467 return expand_expr (dst, target, mode, EXPAND_NORMAL);
2470 /* If the requested len is greater than or equal to the string
2471 length, call strcat. */
2472 if (TREE_CODE (len) == INTEGER_CST && p
2473 && compare_tree_int (len, strlen (p)) >= 0)
2476 tree_cons (NULL_TREE, dst, build_tree_list (NULL_TREE, src)),
2477 fn = built_in_decls[BUILT_IN_STRCAT];
2479 /* If the replacement _DECL isn't initialized, don't do the
2484 return expand_expr (build_function_call_expr (fn, newarglist),
2485 target, mode, EXPAND_NORMAL);
2491 /* Expand expression EXP, which is a call to the strspn builtin.
2492 Return 0 if we failed the caller should emit a normal call,
2493 otherwise try to get the result in TARGET, if convenient. */
2495 expand_builtin_strspn (arglist, target, mode)
2498 enum machine_mode mode;
2500 /* If we need to check memory accesses, call the library function. */
2501 if (current_function_check_memory_usage)
2504 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2508 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
2509 const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
2511 /* If both arguments are constants, evaluate at compile-time. */
2514 const size_t r = strspn (p1, p2);
2515 return expand_expr (size_int (r), target, mode, EXPAND_NORMAL);
2518 /* If either argument is "", return 0. */
2519 if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
2521 /* Evaluate and ignore both arguments in case either one has
2523 expand_expr (s1, const0_rtx, VOIDmode, EXPAND_NORMAL);
2524 expand_expr (s2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2531 /* Expand expression EXP, which is a call to the strcspn builtin.
2532 Return 0 if we failed the caller should emit a normal call,
2533 otherwise try to get the result in TARGET, if convenient. */
2535 expand_builtin_strcspn (arglist, target, mode)
2538 enum machine_mode mode;
2540 /* If we need to check memory accesses, call the library function. */
2541 if (current_function_check_memory_usage)
2544 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2548 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
2549 const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
2551 /* If both arguments are constants, evaluate at compile-time. */
2554 const size_t r = strcspn (p1, p2);
2555 return expand_expr (size_int (r), target, mode, EXPAND_NORMAL);
2558 /* If the first argument is "", return 0. */
2559 if (p1 && *p1 == '\0')
2561 /* Evaluate and ignore argument s2 in case it has
2563 expand_expr (s2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2567 /* If the second argument is "", return __builtin_strlen(s1). */
2568 if (p2 && *p2 == '\0')
2570 tree newarglist = build_tree_list (NULL_TREE, s1),
2571 fn = built_in_decls[BUILT_IN_STRLEN];
2573 /* If the replacement _DECL isn't initialized, don't do the
2578 return expand_expr (build_function_call_expr (fn, newarglist),
2579 target, mode, EXPAND_NORMAL);
2585 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
2586 if that's convenient. */
2589 expand_builtin_saveregs ()
2593 /* Don't do __builtin_saveregs more than once in a function.
2594 Save the result of the first call and reuse it. */
2595 if (saveregs_value != 0)
2596 return saveregs_value;
2598 /* When this function is called, it means that registers must be
2599 saved on entry to this function. So we migrate the call to the
2600 first insn of this function. */
2604 #ifdef EXPAND_BUILTIN_SAVEREGS
2605 /* Do whatever the machine needs done in this case. */
2606 val = EXPAND_BUILTIN_SAVEREGS ();
2608 /* ??? We used to try and build up a call to the out of line function,
2609 guessing about what registers needed saving etc. This became much
2610 harder with __builtin_va_start, since we don't have a tree for a
2611 call to __builtin_saveregs to fall back on. There was exactly one
2612 port (i860) that used this code, and I'm unconvinced it could actually
2613 handle the general case. So we no longer try to handle anything
2614 weird and make the backend absorb the evil. */
2616 error ("__builtin_saveregs not supported by this target");
2623 saveregs_value = val;
2625 /* Put the sequence after the NOTE that starts the function. If this
2626 is inside a SEQUENCE, make the outer-level insn chain current, so
2627 the code is placed at the start of the function. */
2628 push_topmost_sequence ();
2629 emit_insns_after (seq, get_insns ());
2630 pop_topmost_sequence ();
2635 /* __builtin_args_info (N) returns word N of the arg space info
2636 for the current function. The number and meanings of words
2637 is controlled by the definition of CUMULATIVE_ARGS. */
2640 expand_builtin_args_info (exp)
2643 tree arglist = TREE_OPERAND (exp, 1);
2644 int nwords = sizeof (CUMULATIVE_ARGS) / sizeof (int);
2645 int *word_ptr = (int *) ¤t_function_args_info;
2647 /* These are used by the code below that is if 0'ed away */
2649 tree type, elts, result;
2652 if (sizeof (CUMULATIVE_ARGS) % sizeof (int) != 0)
2657 tree arg = TREE_VALUE (arglist);
2658 if (TREE_CODE (arg) != INTEGER_CST)
2659 error ("argument of `__builtin_args_info' must be constant");
2662 int wordnum = TREE_INT_CST_LOW (arg);
2664 if (wordnum < 0 || wordnum >= nwords || TREE_INT_CST_HIGH (arg))
2665 error ("argument of `__builtin_args_info' out of range");
2667 return GEN_INT (word_ptr[wordnum]);
2671 error ("missing argument in `__builtin_args_info'");
2676 for (i = 0; i < nwords; i++)
2677 elts = tree_cons (NULL_TREE, build_int_2 (word_ptr[i], 0));
2679 type = build_array_type (integer_type_node,
2680 build_index_type (build_int_2 (nwords, 0)));
2681 result = build (CONSTRUCTOR, type, NULL_TREE, nreverse (elts));
2682 TREE_CONSTANT (result) = 1;
2683 TREE_STATIC (result) = 1;
2684 result = build1 (INDIRECT_REF, build_pointer_type (type), result);
2685 TREE_CONSTANT (result) = 1;
2686 return expand_expr (result, NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD);
2690 /* Expand ARGLIST, from a call to __builtin_next_arg. */
2692 expand_builtin_next_arg (arglist)
2695 tree fntype = TREE_TYPE (current_function_decl);
2697 if ((TYPE_ARG_TYPES (fntype) == 0
2698 || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype)))
2700 && ! current_function_varargs)
2702 error ("`va_start' used in function with fixed args");
2708 tree last_parm = tree_last (DECL_ARGUMENTS (current_function_decl));
2709 tree arg = TREE_VALUE (arglist);
2711 /* Strip off all nops for the sake of the comparison. This
2712 is not quite the same as STRIP_NOPS. It does more.
2713 We must also strip off INDIRECT_EXPR for C++ reference
2715 while (TREE_CODE (arg) == NOP_EXPR
2716 || TREE_CODE (arg) == CONVERT_EXPR
2717 || TREE_CODE (arg) == NON_LVALUE_EXPR
2718 || TREE_CODE (arg) == INDIRECT_REF)
2719 arg = TREE_OPERAND (arg, 0);
2720 if (arg != last_parm)
2721 warning ("second parameter of `va_start' not last named argument");
2723 else if (! current_function_varargs)
2724 /* Evidently an out of date version of <stdarg.h>; can't validate
2725 va_start's second argument, but can still work as intended. */
2726 warning ("`__builtin_next_arg' called without an argument");
2728 return expand_binop (Pmode, add_optab,
2729 current_function_internal_arg_pointer,
2730 current_function_arg_offset_rtx,
2731 NULL_RTX, 0, OPTAB_LIB_WIDEN);
2734 /* Make it easier for the backends by protecting the valist argument
2735 from multiple evaluations. */
2738 stabilize_va_list (valist, needs_lvalue)
2742 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
2744 if (TREE_SIDE_EFFECTS (valist))
2745 valist = save_expr (valist);
2747 /* For this case, the backends will be expecting a pointer to
2748 TREE_TYPE (va_list_type_node), but it's possible we've
2749 actually been given an array (an actual va_list_type_node).
2751 if (TREE_CODE (TREE_TYPE (valist)) == ARRAY_TYPE)
2753 tree p1 = build_pointer_type (TREE_TYPE (va_list_type_node));
2754 tree p2 = build_pointer_type (va_list_type_node);
2756 valist = build1 (ADDR_EXPR, p2, valist);
2757 valist = fold (build1 (NOP_EXPR, p1, valist));
2766 if (! TREE_SIDE_EFFECTS (valist))
2769 pt = build_pointer_type (va_list_type_node);
2770 valist = fold (build1 (ADDR_EXPR, pt, valist));
2771 TREE_SIDE_EFFECTS (valist) = 1;
2774 if (TREE_SIDE_EFFECTS (valist))
2775 valist = save_expr (valist);
2776 valist = fold (build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (valist)),
2783 /* The "standard" implementation of va_start: just assign `nextarg' to
2786 std_expand_builtin_va_start (stdarg_p, valist, nextarg)
2795 int align = PARM_BOUNDARY / BITS_PER_UNIT;
2796 int offset = (((UNITS_PER_WORD + align - 1) / align) * align);
2797 nextarg = plus_constant (nextarg, -offset);
2800 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
2801 make_tree (ptr_type_node, nextarg));
2802 TREE_SIDE_EFFECTS (t) = 1;
2804 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2807 /* Expand ARGLIST, which from a call to __builtin_stdarg_va_start or
2808 __builtin_varargs_va_start, depending on STDARG_P. */
2810 expand_builtin_va_start (stdarg_p, arglist)
2815 tree chain = arglist, valist;
2818 nextarg = expand_builtin_next_arg (chain = TREE_CHAIN (arglist));
2820 nextarg = expand_builtin_next_arg (NULL_TREE);
2822 if (TREE_CHAIN (chain))
2823 error ("too many arguments to function `va_start'");
2825 valist = stabilize_va_list (TREE_VALUE (arglist), 1);
2827 #ifdef EXPAND_BUILTIN_VA_START
2828 EXPAND_BUILTIN_VA_START (stdarg_p, valist, nextarg);
2830 std_expand_builtin_va_start (stdarg_p, valist, nextarg);
2836 /* The "standard" implementation of va_arg: read the value from the
2837 current (padded) address and increment by the (padded) size. */
2840 std_expand_builtin_va_arg (valist, type)
2844 HOST_WIDE_INT align;
2845 HOST_WIDE_INT rounded_size;
2848 /* Compute the rounded size of the type. */
2849 align = PARM_BOUNDARY / BITS_PER_UNIT;
2850 rounded_size = (((int_size_in_bytes (type) + align - 1) / align) * align);
2854 if (PAD_VARARGS_DOWN)
2856 /* Small args are padded downward. */
2859 adj = TREE_INT_CST_LOW (TYPE_SIZE (type)) / BITS_PER_UNIT;
2860 if (rounded_size > align)
2863 addr_tree = build (PLUS_EXPR, TREE_TYPE (addr_tree), addr_tree,
2864 build_int_2 (rounded_size - adj, 0));
2867 addr = expand_expr (addr_tree, NULL_RTX, Pmode, EXPAND_NORMAL);
2868 addr = copy_to_reg (addr);
2870 /* Compute new value for AP. */
2871 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
2872 build (PLUS_EXPR, TREE_TYPE (valist), valist,
2873 build_int_2 (rounded_size, 0)));
2874 TREE_SIDE_EFFECTS (t) = 1;
2875 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2880 /* Expand __builtin_va_arg, which is not really a builtin function, but
2881 a very special sort of operator. */
2884 expand_builtin_va_arg (valist, type)
2888 tree promoted_type, want_va_type, have_va_type;
2890 /* Verify that valist is of the proper type. */
2892 want_va_type = va_list_type_node;
2893 have_va_type = TREE_TYPE (valist);
2894 if (TREE_CODE (want_va_type) == ARRAY_TYPE)
2896 /* If va_list is an array type, the argument may have decayed
2897 to a pointer type, e.g. by being passed to another function.
2898 In that case, unwrap both types so that we can compare the
2899 underlying records. */
2900 if (TREE_CODE (have_va_type) == ARRAY_TYPE
2901 || TREE_CODE (have_va_type) == POINTER_TYPE)
2903 want_va_type = TREE_TYPE (want_va_type);
2904 have_va_type = TREE_TYPE (have_va_type);
2907 if (TYPE_MAIN_VARIANT (want_va_type) != TYPE_MAIN_VARIANT (have_va_type))
2909 error ("first argument to `va_arg' not of type `va_list'");
2913 /* Generate a diagnostic for requesting data of a type that cannot
2914 be passed through `...' due to type promotion at the call site. */
2915 else if ((promoted_type = (*lang_type_promotes_to) (type)) != NULL_TREE)
2917 const char *name = "<anonymous type>", *pname = 0;
2918 static int gave_help;
2920 if (TYPE_NAME (type))
2922 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
2923 name = IDENTIFIER_POINTER (TYPE_NAME (type));
2924 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
2925 && DECL_NAME (TYPE_NAME (type)))
2926 name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
2928 if (TYPE_NAME (promoted_type))
2930 if (TREE_CODE (TYPE_NAME (promoted_type)) == IDENTIFIER_NODE)
2931 pname = IDENTIFIER_POINTER (TYPE_NAME (promoted_type));
2932 else if (TREE_CODE (TYPE_NAME (promoted_type)) == TYPE_DECL
2933 && DECL_NAME (TYPE_NAME (promoted_type)))
2934 pname = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (promoted_type)));
2937 error ("`%s' is promoted to `%s' when passed through `...'", name, pname);
2941 error ("(so you should pass `%s' not `%s' to `va_arg')", pname, name);
2948 /* Make it easier for the backends by protecting the valist argument
2949 from multiple evaluations. */
2950 valist = stabilize_va_list (valist, 0);
2952 #ifdef EXPAND_BUILTIN_VA_ARG
2953 addr = EXPAND_BUILTIN_VA_ARG (valist, type);
2955 addr = std_expand_builtin_va_arg (valist, type);
2959 result = gen_rtx_MEM (TYPE_MODE (type), addr);
2960 MEM_ALIAS_SET (result) = get_varargs_alias_set ();
2965 /* Expand ARGLIST, from a call to __builtin_va_end. */
2968 expand_builtin_va_end (arglist)
2971 tree valist = TREE_VALUE (arglist);
2973 #ifdef EXPAND_BUILTIN_VA_END
2974 valist = stabilize_va_list (valist, 0);
2975 EXPAND_BUILTIN_VA_END(arglist);
2977 /* Evaluate for side effects, if needed. I hate macros that don't
2979 if (TREE_SIDE_EFFECTS (valist))
2980 expand_expr (valist, const0_rtx, VOIDmode, EXPAND_NORMAL);
2986 /* Expand ARGLIST, from a call to __builtin_va_copy. We do this as a
2987 builtin rather than just as an assignment in stdarg.h because of the
2988 nastiness of array-type va_list types. */
2991 expand_builtin_va_copy (arglist)
2996 dst = TREE_VALUE (arglist);
2997 src = TREE_VALUE (TREE_CHAIN (arglist));
2999 dst = stabilize_va_list (dst, 1);
3000 src = stabilize_va_list (src, 0);
3002 if (TREE_CODE (va_list_type_node) != ARRAY_TYPE)
3004 t = build (MODIFY_EXPR, va_list_type_node, dst, src);
3005 TREE_SIDE_EFFECTS (t) = 1;
3006 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
3010 rtx dstb, srcb, size;
3012 /* Evaluate to pointers. */
3013 dstb = expand_expr (dst, NULL_RTX, Pmode, EXPAND_NORMAL);
3014 srcb = expand_expr (src, NULL_RTX, Pmode, EXPAND_NORMAL);
3015 size = expand_expr (TYPE_SIZE_UNIT (va_list_type_node), NULL_RTX,
3016 VOIDmode, EXPAND_NORMAL);
3018 /* "Dereference" to BLKmode memories. */
3019 dstb = gen_rtx_MEM (BLKmode, dstb);
3020 MEM_ALIAS_SET (dstb) = get_alias_set (TREE_TYPE (TREE_TYPE (dst)));
3021 srcb = gen_rtx_MEM (BLKmode, srcb);
3022 MEM_ALIAS_SET (srcb) = get_alias_set (TREE_TYPE (TREE_TYPE (src)));
3025 emit_block_move (dstb, srcb, size, TYPE_ALIGN (va_list_type_node));
3031 /* Expand a call to one of the builtin functions __builtin_frame_address or
3032 __builtin_return_address. */
3034 expand_builtin_frame_address (exp)
3037 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3038 tree arglist = TREE_OPERAND (exp, 1);
3040 /* The argument must be a nonnegative integer constant.
3041 It counts the number of frames to scan up the stack.
3042 The value is the return address saved in that frame. */
3044 /* Warning about missing arg was already issued. */
3046 else if (TREE_CODE (TREE_VALUE (arglist)) != INTEGER_CST
3047 || tree_int_cst_sgn (TREE_VALUE (arglist)) < 0)
3049 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3050 error ("invalid arg to `__builtin_frame_address'");
3052 error ("invalid arg to `__builtin_return_address'");
3057 rtx tem = expand_builtin_return_addr (DECL_FUNCTION_CODE (fndecl),
3058 TREE_INT_CST_LOW (TREE_VALUE (arglist)),
3059 hard_frame_pointer_rtx);
3061 /* Some ports cannot access arbitrary stack frames. */
3064 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3065 warning ("unsupported arg to `__builtin_frame_address'");
3067 warning ("unsupported arg to `__builtin_return_address'");
3071 /* For __builtin_frame_address, return what we've got. */
3072 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3075 if (GET_CODE (tem) != REG
3076 && ! CONSTANT_P (tem))
3077 tem = copy_to_mode_reg (Pmode, tem);
3082 /* Expand a call to the alloca builtin, with arguments ARGLIST. Return 0 if
3083 we failed and the caller should emit a normal call, otherwise try to get
3084 the result in TARGET, if convenient. */
3086 expand_builtin_alloca (arglist, target)
3092 if (!validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
3095 /* Compute the argument. */
3096 op0 = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
3098 /* Allocate the desired space. */
3099 return allocate_dynamic_stack_space (op0, target, BITS_PER_UNIT);
3102 /* Expand a call to the ffs builtin. The arguments are in ARGLIST.
3103 Return 0 if a normal call should be emitted rather than expanding the
3104 function in-line. If convenient, the result should be placed in TARGET.
3105 SUBTARGET may be used as the target for computing one of EXP's operands. */
3107 expand_builtin_ffs (arglist, target, subtarget)
3109 rtx target, subtarget;
3112 if (!validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
3115 /* Compute the argument. */
3116 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
3117 /* Compute ffs, into TARGET if possible.
3118 Set TARGET to wherever the result comes back. */
3119 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
3120 ffs_optab, op0, target, 1);
3126 /* If the string passed to fputs is a constant and is one character
3127 long, we attempt to transform this call into __builtin_fputc(). */
3129 expand_builtin_fputs (arglist, ignore)
3133 tree len, fn, fn_fputc = built_in_decls[BUILT_IN_FPUTC],
3134 fn_fwrite = built_in_decls[BUILT_IN_FWRITE];
3136 /* If the return value is used, or the replacement _DECL isn't
3137 initialized, don't do the transformation. */
3138 if (!ignore || !fn_fputc || !fn_fwrite)
3141 /* Verify the arguments in the original call. */
3142 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
3143 || current_function_check_memory_usage)
3146 /* Get the length of the string passed to fputs. If the length
3147 can't be determined, punt. */
3148 if (!(len = c_strlen (TREE_VALUE (arglist)))
3149 || TREE_CODE (len) != INTEGER_CST)
3152 switch (compare_tree_int (len, 1))
3154 case -1: /* length is 0, delete the call entirely . */
3156 /* Evaluate and ignore the argument in case it has
3158 expand_expr (TREE_VALUE (TREE_CHAIN (arglist)), const0_rtx,
3159 VOIDmode, EXPAND_NORMAL);
3162 case 0: /* length is 1, call fputc. */
3164 const char *p = c_getstr (TREE_VALUE (arglist));
3168 /* New argument list transforming fputs(string, stream) to
3169 fputc(string[0], stream). */
3171 build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)));
3173 tree_cons (NULL_TREE, build_int_2 (p[0], 0), arglist);
3179 case 1: /* length is greater than 1, call fwrite. */
3181 tree string_arg = TREE_VALUE (arglist);
3183 /* New argument list transforming fputs(string, stream) to
3184 fwrite(string, 1, len, stream). */
3185 arglist = build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)));
3186 arglist = tree_cons (NULL_TREE, len, arglist);
3187 arglist = tree_cons (NULL_TREE, integer_one_node, arglist);
3188 arglist = tree_cons (NULL_TREE, string_arg, arglist);
3196 return expand_expr (build_function_call_expr (fn, arglist),
3197 (ignore ? const0_rtx : NULL_RTX),
3198 VOIDmode, EXPAND_NORMAL);
3201 /* Expand a call to __builtin_expect. We return our argument and
3202 emit a NOTE_INSN_EXPECTED_VALUE note. */
3205 expand_builtin_expect (arglist, target)
3212 if (arglist == NULL_TREE
3213 || TREE_CHAIN (arglist) == NULL_TREE)
3215 exp = TREE_VALUE (arglist);
3216 c = TREE_VALUE (TREE_CHAIN (arglist));
3218 if (TREE_CODE (c) != INTEGER_CST)
3220 error ("second arg to `__builtin_expect' must be a constant");
3221 c = integer_zero_node;
3224 target = expand_expr (exp, target, VOIDmode, EXPAND_NORMAL);
3226 /* Don't bother with expected value notes for integral constants. */
3227 if (GET_CODE (target) != CONST_INT)
3229 /* We do need to force this into a register so that we can be
3230 moderately sure to be able to correctly interpret the branch
3232 target = force_reg (GET_MODE (target), target);
3234 rtx_c = expand_expr (c, NULL_RTX, GET_MODE (target), EXPAND_NORMAL);
3236 note = emit_note (NULL, NOTE_INSN_EXPECTED_VALUE);
3237 NOTE_EXPECTED_VALUE (note) = gen_rtx_EQ (VOIDmode, target, rtx_c);
3243 /* Expand an expression EXP that calls a built-in function,
3244 with result going to TARGET if that's convenient
3245 (and in mode MODE if that's convenient).
3246 SUBTARGET may be used as the target for computing one of EXP's operands.
3247 IGNORE is nonzero if the value is to be ignored. */
3250 expand_builtin (exp, target, subtarget, mode, ignore)
3254 enum machine_mode mode;
3257 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3258 tree arglist = TREE_OPERAND (exp, 1);
3259 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
3261 #ifdef MD_EXPAND_BUILTIN
3262 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
3263 return MD_EXPAND_BUILTIN (exp, target, subtarget, mode, ignore);
3266 /* When not optimizing, generate calls to library functions for a certain
3268 if (! optimize && ! CALLED_AS_BUILT_IN (fndecl)
3269 && (fcode == BUILT_IN_SIN || fcode == BUILT_IN_COS
3270 || fcode == BUILT_IN_FSQRT || fcode == BUILT_IN_MEMSET
3271 || fcode == BUILT_IN_MEMCPY || fcode == BUILT_IN_MEMCMP
3272 || fcode == BUILT_IN_BCMP || fcode == BUILT_IN_BZERO
3273 || fcode == BUILT_IN_INDEX || fcode == BUILT_IN_RINDEX
3274 || fcode == BUILT_IN_STRCHR || fcode == BUILT_IN_STRRCHR
3275 || fcode == BUILT_IN_STRLEN || fcode == BUILT_IN_STRCPY
3276 || fcode == BUILT_IN_STRNCPY || fcode == BUILT_IN_STRNCMP
3277 || fcode == BUILT_IN_STRSTR || fcode == BUILT_IN_STRPBRK
3278 || fcode == BUILT_IN_STRCAT || fcode == BUILT_IN_STRNCAT
3279 || fcode == BUILT_IN_STRSPN || fcode == BUILT_IN_STRCSPN
3280 || fcode == BUILT_IN_STRCMP || fcode == BUILT_IN_FFS
3281 || fcode == BUILT_IN_PUTCHAR || fcode == BUILT_IN_PUTS
3282 || fcode == BUILT_IN_PRINTF || fcode == BUILT_IN_FPUTC
3283 || fcode == BUILT_IN_FPUTS || fcode == BUILT_IN_FWRITE))
3284 return expand_call (exp, target, ignore);
3290 /* build_function_call changes these into ABS_EXPR. */
3295 /* Treat these like sqrt, but only if the user asks for them. */
3296 if (! flag_fast_math)
3298 case BUILT_IN_FSQRT:
3299 target = expand_builtin_mathfn (exp, target, subtarget);
3307 case BUILT_IN_APPLY_ARGS:
3308 return expand_builtin_apply_args ();
3310 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
3311 FUNCTION with a copy of the parameters described by
3312 ARGUMENTS, and ARGSIZE. It returns a block of memory
3313 allocated on the stack into which is stored all the registers
3314 that might possibly be used for returning the result of a
3315 function. ARGUMENTS is the value returned by
3316 __builtin_apply_args. ARGSIZE is the number of bytes of
3317 arguments that must be copied. ??? How should this value be
3318 computed? We'll also need a safe worst case value for varargs
3320 case BUILT_IN_APPLY:
3321 if (!validate_arglist (arglist, POINTER_TYPE,
3322 POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
3323 && !validate_arglist (arglist, REFERENCE_TYPE,
3324 POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
3332 for (t = arglist, i = 0; t; t = TREE_CHAIN (t), i++)
3333 ops[i] = expand_expr (TREE_VALUE (t), NULL_RTX, VOIDmode, 0);
3335 return expand_builtin_apply (ops[0], ops[1], ops[2]);
3338 /* __builtin_return (RESULT) causes the function to return the
3339 value described by RESULT. RESULT is address of the block of
3340 memory returned by __builtin_apply. */
3341 case BUILT_IN_RETURN:
3342 if (validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
3343 expand_builtin_return (expand_expr (TREE_VALUE (arglist),
3344 NULL_RTX, VOIDmode, 0));
3347 case BUILT_IN_SAVEREGS:
3348 return expand_builtin_saveregs ();
3350 case BUILT_IN_ARGS_INFO:
3351 return expand_builtin_args_info (exp);
3353 /* Return the address of the first anonymous stack arg. */
3354 case BUILT_IN_NEXT_ARG:
3355 return expand_builtin_next_arg (arglist);
3357 case BUILT_IN_CLASSIFY_TYPE:
3358 return expand_builtin_classify_type (arglist);
3360 case BUILT_IN_CONSTANT_P:
3361 return expand_builtin_constant_p (exp);
3363 case BUILT_IN_FRAME_ADDRESS:
3364 case BUILT_IN_RETURN_ADDRESS:
3365 return expand_builtin_frame_address (exp);
3367 /* Returns the address of the area where the structure is returned.
3369 case BUILT_IN_AGGREGATE_INCOMING_ADDRESS:
3371 || ! AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl)))
3372 || GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl))) != MEM)
3375 return XEXP (DECL_RTL (DECL_RESULT (current_function_decl)), 0);
3377 case BUILT_IN_ALLOCA:
3378 target = expand_builtin_alloca (arglist, target);
3384 target = expand_builtin_ffs (arglist, target, subtarget);
3389 case BUILT_IN_STRLEN:
3390 target = expand_builtin_strlen (exp, target);
3395 case BUILT_IN_STRCPY:
3396 target = expand_builtin_strcpy (exp);
3401 case BUILT_IN_STRNCPY:
3402 target = expand_builtin_strncpy (arglist, target, mode);
3407 case BUILT_IN_STRCAT:
3408 target = expand_builtin_strcat (arglist, target, mode);
3413 case BUILT_IN_STRNCAT:
3414 target = expand_builtin_strncat (arglist, target, mode);
3419 case BUILT_IN_STRSPN:
3420 target = expand_builtin_strspn (arglist, target, mode);
3425 case BUILT_IN_STRCSPN:
3426 target = expand_builtin_strcspn (arglist, target, mode);
3431 case BUILT_IN_STRSTR:
3432 target = expand_builtin_strstr (arglist, target, mode);
3437 case BUILT_IN_STRPBRK:
3438 target = expand_builtin_strpbrk (arglist, target, mode);
3443 case BUILT_IN_INDEX:
3444 case BUILT_IN_STRCHR:
3445 target = expand_builtin_strchr (arglist, target, mode);
3450 case BUILT_IN_RINDEX:
3451 case BUILT_IN_STRRCHR:
3452 target = expand_builtin_strrchr (arglist, target, mode);
3457 case BUILT_IN_MEMCPY:
3458 target = expand_builtin_memcpy (arglist);
3463 case BUILT_IN_MEMSET:
3464 target = expand_builtin_memset (exp);
3469 case BUILT_IN_BZERO:
3470 target = expand_builtin_bzero (exp);
3475 case BUILT_IN_STRCMP:
3476 target = expand_builtin_strcmp (exp, target, mode);
3481 case BUILT_IN_STRNCMP:
3482 target = expand_builtin_strncmp (exp, target, mode);
3487 /* These comparison functions need an instruction that returns an actual
3488 index. An ordinary compare that just sets the condition codes
3490 #ifdef HAVE_cmpstrsi
3492 case BUILT_IN_MEMCMP:
3493 target = expand_builtin_memcmp (exp, arglist, target);
3499 case BUILT_IN_MEMCMP:
3503 case BUILT_IN_SETJMP:
3504 target = expand_builtin_setjmp (arglist, target);
3509 /* __builtin_longjmp is passed a pointer to an array of five words.
3510 It's similar to the C library longjmp function but works with
3511 __builtin_setjmp above. */
3512 case BUILT_IN_LONGJMP:
3513 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
3517 rtx buf_addr = expand_expr (TREE_VALUE (arglist), subtarget,
3519 rtx value = expand_expr (TREE_VALUE (TREE_CHAIN (arglist)),
3520 NULL_RTX, VOIDmode, 0);
3522 if (value != const1_rtx)
3524 error ("__builtin_longjmp second argument must be 1");
3528 expand_builtin_longjmp (buf_addr, value);
3535 emit_insn (gen_trap ());
3538 error ("__builtin_trap not supported by this target");
3542 case BUILT_IN_PUTCHAR:
3544 case BUILT_IN_FPUTC:
3545 case BUILT_IN_FWRITE:
3547 case BUILT_IN_FPUTS:
3548 target = expand_builtin_fputs (arglist, ignore);
3553 /* Various hooks for the DWARF 2 __throw routine. */
3554 case BUILT_IN_UNWIND_INIT:
3555 expand_builtin_unwind_init ();
3557 case BUILT_IN_DWARF_CFA:
3558 return virtual_cfa_rtx;
3559 #ifdef DWARF2_UNWIND_INFO
3560 case BUILT_IN_DWARF_FP_REGNUM:
3561 return expand_builtin_dwarf_fp_regnum ();
3562 case BUILT_IN_INIT_DWARF_REG_SIZES:
3563 expand_builtin_init_dwarf_reg_sizes (TREE_VALUE (arglist));
3566 case BUILT_IN_FROB_RETURN_ADDR:
3567 return expand_builtin_frob_return_addr (TREE_VALUE (arglist));
3568 case BUILT_IN_EXTRACT_RETURN_ADDR:
3569 return expand_builtin_extract_return_addr (TREE_VALUE (arglist));
3570 case BUILT_IN_EH_RETURN:
3571 expand_builtin_eh_return (TREE_VALUE (arglist),
3572 TREE_VALUE (TREE_CHAIN (arglist)),
3573 TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))));
3575 case BUILT_IN_VARARGS_START:
3576 return expand_builtin_va_start (0, arglist);
3577 case BUILT_IN_STDARG_START:
3578 return expand_builtin_va_start (1, arglist);
3579 case BUILT_IN_VA_END:
3580 return expand_builtin_va_end (arglist);
3581 case BUILT_IN_VA_COPY:
3582 return expand_builtin_va_copy (arglist);
3583 case BUILT_IN_EXPECT:
3584 return expand_builtin_expect (arglist, target);
3586 default: /* just do library call, if unknown builtin */
3587 error ("built-in function `%s' not currently supported",
3588 IDENTIFIER_POINTER (DECL_NAME (fndecl)));
3591 /* The switch statement above can drop through to cause the function
3592 to be called normally. */
3593 return expand_call (exp, target, ignore);
3596 /* Fold a call to __builtin_constant_p, if we know it will evaluate to a
3597 constant. ARGLIST is the argument list of the call. */
3600 fold_builtin_constant_p (arglist)
3606 arglist = TREE_VALUE (arglist);
3608 /* We return 1 for a numeric type that's known to be a constant
3609 value at compile-time or for an aggregate type that's a
3610 literal constant. */
3611 STRIP_NOPS (arglist);
3613 /* If we know this is a constant, emit the constant of one. */
3614 if (TREE_CODE_CLASS (TREE_CODE (arglist)) == 'c'
3615 || (TREE_CODE (arglist) == CONSTRUCTOR
3616 && TREE_CONSTANT (arglist))
3617 || (TREE_CODE (arglist) == ADDR_EXPR
3618 && TREE_CODE (TREE_OPERAND (arglist, 0)) == STRING_CST))
3619 return integer_one_node;
3621 /* If we aren't going to be running CSE or this expression
3622 has side effects, show we don't know it to be a constant.
3623 Likewise if it's a pointer or aggregate type since in those
3624 case we only want literals, since those are only optimized
3625 when generating RTL, not later. */
3626 if (TREE_SIDE_EFFECTS (arglist) || cse_not_expected
3627 || AGGREGATE_TYPE_P (TREE_TYPE (arglist))
3628 || POINTER_TYPE_P (TREE_TYPE (arglist)))
3629 return integer_zero_node;
3634 /* Used by constant folding to eliminate some builtin calls early. EXP is
3635 the CALL_EXPR of a call to a builtin function. */
3641 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3642 tree arglist = TREE_OPERAND (exp, 1);
3643 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
3645 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
3650 case BUILT_IN_CONSTANT_P:
3651 return fold_builtin_constant_p (arglist);
3653 case BUILT_IN_STRLEN:
3654 if (validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
3656 tree len = c_strlen (TREE_VALUE (arglist));
3670 build_function_call_expr (fn, arglist)
3675 call_expr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), fn);
3676 call_expr = build (CALL_EXPR, TREE_TYPE (TREE_TYPE (fn)),
3677 call_expr, arglist);
3678 TREE_SIDE_EFFECTS (call_expr) = 1;
3679 return fold (call_expr);
3682 /* This function validates the types of a function call argument list
3683 represented as a tree chain of parameters against a specified list
3684 of tree_codes. If the last specifier is a 0, that represents an
3685 ellipses, otherwise the last specifier must be a VOID_TYPE. */
3687 validate_arglist VPARAMS ((tree arglist, ...))
3689 #ifndef ANSI_PROTOTYPES
3692 enum tree_code code;
3695 VA_START (ap, arglist);
3697 #ifndef ANSI_PROTOTYPES
3698 arglist = va_arg (ap, tree);
3702 code = va_arg (ap, enum tree_code);
3706 /* This signifies an ellipses, any further arguments are all ok. */
3710 /* This signifies an endlink, if no arguments remain, return
3711 true, otherwise return false. */
3713 return arglist == 0;
3715 /* If no parameters remain or the parameter's code does not
3716 match the specified code, return false. Otherwise continue
3717 checking any remaining arguments. */
3718 if (arglist == 0 || code != TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))))
3725 arglist = TREE_CHAIN (arglist);