1 /* Expand builtin functions.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000, 2001 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
30 #include "hard-reg-set.h"
33 #include "insn-config.h"
37 #include "typeclass.h"
41 #define CALLED_AS_BUILT_IN(NODE) \
42 (!strncmp (IDENTIFIER_POINTER (DECL_NAME (NODE)), "__builtin_", 10))
44 /* Register mappings for target machines without register windows. */
45 #ifndef INCOMING_REGNO
46 #define INCOMING_REGNO(OUT) (OUT)
48 #ifndef OUTGOING_REGNO
49 #define OUTGOING_REGNO(IN) (IN)
52 #ifndef PAD_VARARGS_DOWN
53 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
56 /* Define the names of the builtin function types and codes. */
57 const char *const built_in_class_names[4]
58 = {"NOT_BUILT_IN", "BUILT_IN_FRONTEND", "BUILT_IN_MD", "BUILT_IN_NORMAL"};
60 #define DEF_BUILTIN(X, N, C, T, LT, B, F, NA) STRINGX(X),
61 const char *const built_in_names[(int) END_BUILTINS] =
63 #include "builtins.def"
67 /* Setup an array of _DECL trees, make sure each element is
68 initialized to NULL_TREE. */
69 tree built_in_decls[(int) END_BUILTINS];
71 tree (*lang_type_promotes_to) PARAMS ((tree));
73 static int get_pointer_alignment PARAMS ((tree, unsigned));
74 static tree c_strlen PARAMS ((tree));
75 static const char *c_getstr PARAMS ((tree));
76 static rtx c_readstr PARAMS ((const char *,
78 static int target_char_cast PARAMS ((tree, char *));
79 static rtx get_memory_rtx PARAMS ((tree));
80 static int apply_args_size PARAMS ((void));
81 static int apply_result_size PARAMS ((void));
82 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
83 static rtx result_vector PARAMS ((int, rtx));
85 static rtx expand_builtin_setjmp PARAMS ((tree, rtx));
86 static rtx expand_builtin_apply_args PARAMS ((void));
87 static rtx expand_builtin_apply_args_1 PARAMS ((void));
88 static rtx expand_builtin_apply PARAMS ((rtx, rtx, rtx));
89 static void expand_builtin_return PARAMS ((rtx));
90 static rtx expand_builtin_classify_type PARAMS ((tree));
91 static rtx expand_builtin_mathfn PARAMS ((tree, rtx, rtx));
92 static rtx expand_builtin_constant_p PARAMS ((tree));
93 static rtx expand_builtin_args_info PARAMS ((tree));
94 static rtx expand_builtin_next_arg PARAMS ((tree));
95 static rtx expand_builtin_va_start PARAMS ((int, tree));
96 static rtx expand_builtin_va_end PARAMS ((tree));
97 static rtx expand_builtin_va_copy PARAMS ((tree));
99 static rtx expand_builtin_memcmp PARAMS ((tree, tree, rtx));
101 static rtx expand_builtin_strcmp PARAMS ((tree, rtx,
103 static rtx expand_builtin_strncmp PARAMS ((tree, rtx,
105 static rtx builtin_memcpy_read_str PARAMS ((PTR, HOST_WIDE_INT,
107 static rtx expand_builtin_strcat PARAMS ((tree, rtx,
109 static rtx expand_builtin_strncat PARAMS ((tree, rtx,
111 static rtx expand_builtin_strspn PARAMS ((tree, rtx,
113 static rtx expand_builtin_strcspn PARAMS ((tree, rtx,
115 static rtx expand_builtin_memcpy PARAMS ((tree));
116 static rtx expand_builtin_strcpy PARAMS ((tree));
117 static rtx builtin_strncpy_read_str PARAMS ((PTR, HOST_WIDE_INT,
119 static rtx expand_builtin_strncpy PARAMS ((tree, rtx,
121 static rtx builtin_memset_read_str PARAMS ((PTR, HOST_WIDE_INT,
123 static rtx expand_builtin_memset PARAMS ((tree));
124 static rtx expand_builtin_bzero PARAMS ((tree));
125 static rtx expand_builtin_strlen PARAMS ((tree, rtx));
126 static rtx expand_builtin_strstr PARAMS ((tree, rtx,
128 static rtx expand_builtin_strpbrk PARAMS ((tree, rtx,
130 static rtx expand_builtin_strchr PARAMS ((tree, rtx,
132 static rtx expand_builtin_strrchr PARAMS ((tree, rtx,
134 static rtx expand_builtin_alloca PARAMS ((tree, rtx));
135 static rtx expand_builtin_ffs PARAMS ((tree, rtx, rtx));
136 static rtx expand_builtin_frame_address PARAMS ((tree));
137 static rtx expand_builtin_fputs PARAMS ((tree, int));
138 static tree stabilize_va_list PARAMS ((tree, int));
139 static rtx expand_builtin_expect PARAMS ((tree, rtx));
140 static tree fold_builtin_constant_p PARAMS ((tree));
141 static tree build_function_call_expr PARAMS ((tree, tree));
142 static int validate_arglist PARAMS ((tree, ...));
144 /* Return the alignment in bits of EXP, a pointer valued expression.
145 But don't return more than MAX_ALIGN no matter what.
146 The alignment returned is, by default, the alignment of the thing that
147 EXP points to (if it is not a POINTER_TYPE, 0 is returned).
149 Otherwise, look at the expression to see if we can do better, i.e., if the
150 expression is actually pointing at an object whose alignment is tighter. */
153 get_pointer_alignment (exp, max_align)
157 unsigned align, inner;
159 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
162 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
163 align = MIN (align, max_align);
167 switch (TREE_CODE (exp))
171 case NON_LVALUE_EXPR:
172 exp = TREE_OPERAND (exp, 0);
173 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
176 inner = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
177 align = MIN (inner, max_align);
181 /* If sum of pointer + int, restrict our maximum alignment to that
182 imposed by the integer. If not, we can't do any better than
184 if (! host_integerp (TREE_OPERAND (exp, 1), 1))
187 while (((tree_low_cst (TREE_OPERAND (exp, 1), 1) * BITS_PER_UNIT)
192 exp = TREE_OPERAND (exp, 0);
196 /* See what we are pointing at and look at its alignment. */
197 exp = TREE_OPERAND (exp, 0);
198 if (TREE_CODE (exp) == FUNCTION_DECL)
199 align = FUNCTION_BOUNDARY;
200 else if (DECL_P (exp))
201 align = DECL_ALIGN (exp);
202 #ifdef CONSTANT_ALIGNMENT
203 else if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'c')
204 align = CONSTANT_ALIGNMENT (exp, align);
206 return MIN (align, max_align);
214 /* Compute the length of a C string. TREE_STRING_LENGTH is not the right
215 way, because it could contain a zero byte in the middle.
216 TREE_STRING_LENGTH is the size of the character array, not the string.
218 The value returned is of type `ssizetype'.
220 Unfortunately, string_constant can't access the values of const char
221 arrays with initializers, so neither can we do so here. */
231 src = string_constant (src, &offset_node);
235 max = TREE_STRING_LENGTH (src) - 1;
236 ptr = TREE_STRING_POINTER (src);
238 if (offset_node && TREE_CODE (offset_node) != INTEGER_CST)
240 /* If the string has an internal zero byte (e.g., "foo\0bar"), we can't
241 compute the offset to the following null if we don't know where to
242 start searching for it. */
245 for (i = 0; i < max; i++)
249 /* We don't know the starting offset, but we do know that the string
250 has no internal zero bytes. We can assume that the offset falls
251 within the bounds of the string; otherwise, the programmer deserves
252 what he gets. Subtract the offset from the length of the string,
253 and return that. This would perhaps not be valid if we were dealing
254 with named arrays in addition to literal string constants. */
256 return size_diffop (size_int (max), offset_node);
259 /* We have a known offset into the string. Start searching there for
261 if (offset_node == 0)
265 /* Did we get a long long offset? If so, punt. */
266 if (TREE_INT_CST_HIGH (offset_node) != 0)
268 offset = TREE_INT_CST_LOW (offset_node);
271 /* If the offset is known to be out of bounds, warn, and call strlen at
273 if (offset < 0 || offset > max)
275 warning ("offset outside bounds of constant string");
279 /* Use strlen to search for the first zero byte. Since any strings
280 constructed with build_string will have nulls appended, we win even
281 if we get handed something like (char[4])"abcd".
283 Since OFFSET is our starting index into the string, no further
284 calculation is needed. */
285 return ssize_int (strlen (ptr + offset));
288 /* Return a char pointer for a C string if it is a string constant
289 or sum of string constant and integer constant. */
299 src = string_constant (src, &offset_node);
303 max = TREE_STRING_LENGTH (src) - 1;
304 ptr = TREE_STRING_POINTER (src);
308 else if (TREE_CODE (offset_node) != INTEGER_CST)
312 /* Did we get a long long offset? If so, punt. */
313 if (TREE_INT_CST_HIGH (offset_node) != 0)
315 offset = TREE_INT_CST_LOW (offset_node);
316 if (offset < 0 || offset > max)
323 /* Return a CONST_INT or CONST_DOUBLE corresponding to target
324 reading GET_MODE_BITSIZE (MODE) bits from string constant
328 c_readstr (str, mode)
330 enum machine_mode mode;
336 if (GET_MODE_CLASS (mode) != MODE_INT)
341 for (i = 0; i < GET_MODE_SIZE (mode); i++)
344 if (WORDS_BIG_ENDIAN)
345 j = GET_MODE_SIZE (mode) - i - 1;
346 if (BYTES_BIG_ENDIAN != WORDS_BIG_ENDIAN
347 && GET_MODE_SIZE (mode) > UNITS_PER_WORD)
348 j = j + UNITS_PER_WORD - 2 * (j % UNITS_PER_WORD) - 1;
350 if (j > 2 * HOST_BITS_PER_WIDE_INT)
353 ch = (unsigned char) str[i];
354 c[j / HOST_BITS_PER_WIDE_INT] |= ch << (j % HOST_BITS_PER_WIDE_INT);
356 return immed_double_const (c[0], c[1], mode);
359 /* Cast a target constant CST to target CHAR and if that value fits into
360 host char type, return zero and put that value into variable pointed by
364 target_char_cast (cst, p)
368 unsigned HOST_WIDE_INT val, hostval;
370 if (TREE_CODE (cst) != INTEGER_CST
371 || CHAR_TYPE_SIZE > HOST_BITS_PER_WIDE_INT)
374 val = TREE_INT_CST_LOW (cst);
375 if (CHAR_TYPE_SIZE < HOST_BITS_PER_WIDE_INT)
376 val &= (((unsigned HOST_WIDE_INT) 1) << CHAR_TYPE_SIZE) - 1;
379 if (HOST_BITS_PER_CHAR < HOST_BITS_PER_WIDE_INT)
380 hostval &= (((unsigned HOST_WIDE_INT) 1) << HOST_BITS_PER_CHAR) - 1;
389 /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
390 times to get the address of either a higher stack frame, or a return
391 address located within it (depending on FNDECL_CODE). */
394 expand_builtin_return_addr (fndecl_code, count, tem)
395 enum built_in_function fndecl_code;
401 /* Some machines need special handling before we can access
402 arbitrary frames. For example, on the sparc, we must first flush
403 all register windows to the stack. */
404 #ifdef SETUP_FRAME_ADDRESSES
406 SETUP_FRAME_ADDRESSES ();
409 /* On the sparc, the return address is not in the frame, it is in a
410 register. There is no way to access it off of the current frame
411 pointer, but it can be accessed off the previous frame pointer by
412 reading the value from the register window save area. */
413 #ifdef RETURN_ADDR_IN_PREVIOUS_FRAME
414 if (fndecl_code == BUILT_IN_RETURN_ADDRESS)
418 /* Scan back COUNT frames to the specified frame. */
419 for (i = 0; i < count; i++)
421 /* Assume the dynamic chain pointer is in the word that the
422 frame address points to, unless otherwise specified. */
423 #ifdef DYNAMIC_CHAIN_ADDRESS
424 tem = DYNAMIC_CHAIN_ADDRESS (tem);
426 tem = memory_address (Pmode, tem);
427 tem = gen_rtx_MEM (Pmode, tem);
428 MEM_ALIAS_SET (tem) = get_frame_alias_set ();
429 tem = copy_to_reg (tem);
432 /* For __builtin_frame_address, return what we've got. */
433 if (fndecl_code == BUILT_IN_FRAME_ADDRESS)
436 /* For __builtin_return_address, Get the return address from that
438 #ifdef RETURN_ADDR_RTX
439 tem = RETURN_ADDR_RTX (count, tem);
441 tem = memory_address (Pmode,
442 plus_constant (tem, GET_MODE_SIZE (Pmode)));
443 tem = gen_rtx_MEM (Pmode, tem);
444 MEM_ALIAS_SET (tem) = get_frame_alias_set ();
449 /* Alias set used for setjmp buffer. */
450 static HOST_WIDE_INT setjmp_alias_set = -1;
452 /* Construct the leading half of a __builtin_setjmp call. Control will
453 return to RECEIVER_LABEL. This is used directly by sjlj exception
457 expand_builtin_setjmp_setup (buf_addr, receiver_label)
461 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
465 if (setjmp_alias_set == -1)
466 setjmp_alias_set = new_alias_set ();
468 #ifdef POINTERS_EXTEND_UNSIGNED
469 buf_addr = convert_memory_address (Pmode, buf_addr);
472 buf_addr = force_reg (Pmode, force_operand (buf_addr, NULL_RTX));
476 /* We store the frame pointer and the address of receiver_label in
477 the buffer and use the rest of it for the stack save area, which
478 is machine-dependent. */
480 #ifndef BUILTIN_SETJMP_FRAME_VALUE
481 #define BUILTIN_SETJMP_FRAME_VALUE virtual_stack_vars_rtx
484 mem = gen_rtx_MEM (Pmode, buf_addr);
485 MEM_ALIAS_SET (mem) = setjmp_alias_set;
486 emit_move_insn (mem, BUILTIN_SETJMP_FRAME_VALUE);
488 mem = gen_rtx_MEM (Pmode, plus_constant (buf_addr, GET_MODE_SIZE (Pmode))),
489 MEM_ALIAS_SET (mem) = setjmp_alias_set;
491 emit_move_insn (validize_mem (mem),
492 force_reg (Pmode, gen_rtx_LABEL_REF (Pmode, receiver_label)));
494 stack_save = gen_rtx_MEM (sa_mode,
495 plus_constant (buf_addr,
496 2 * GET_MODE_SIZE (Pmode)));
497 MEM_ALIAS_SET (stack_save) = setjmp_alias_set;
498 emit_stack_save (SAVE_NONLOCAL, &stack_save, NULL_RTX);
500 /* If there is further processing to do, do it. */
501 #ifdef HAVE_builtin_setjmp_setup
502 if (HAVE_builtin_setjmp_setup)
503 emit_insn (gen_builtin_setjmp_setup (buf_addr));
506 /* Tell optimize_save_area_alloca that extra work is going to
507 need to go on during alloca. */
508 current_function_calls_setjmp = 1;
510 /* Set this so all the registers get saved in our frame; we need to be
511 able to copy the saved values for any registers from frames we unwind. */
512 current_function_has_nonlocal_label = 1;
515 /* Construct the trailing part of a __builtin_setjmp call.
516 This is used directly by sjlj exception handling code. */
519 expand_builtin_setjmp_receiver (receiver_label)
520 rtx receiver_label ATTRIBUTE_UNUSED;
522 /* Clobber the FP when we get here, so we have to make sure it's
523 marked as used by this function. */
524 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
526 /* Mark the static chain as clobbered here so life information
527 doesn't get messed up for it. */
528 emit_insn (gen_rtx_CLOBBER (VOIDmode, static_chain_rtx));
530 /* Now put in the code to restore the frame pointer, and argument
531 pointer, if needed. The code below is from expand_end_bindings
532 in stmt.c; see detailed documentation there. */
533 #ifdef HAVE_nonlocal_goto
534 if (! HAVE_nonlocal_goto)
536 emit_move_insn (virtual_stack_vars_rtx, hard_frame_pointer_rtx);
538 #if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
539 if (fixed_regs[ARG_POINTER_REGNUM])
541 #ifdef ELIMINABLE_REGS
543 static struct elims {int from, to;} elim_regs[] = ELIMINABLE_REGS;
545 for (i = 0; i < ARRAY_SIZE (elim_regs); i++)
546 if (elim_regs[i].from == ARG_POINTER_REGNUM
547 && elim_regs[i].to == HARD_FRAME_POINTER_REGNUM)
550 if (i == ARRAY_SIZE (elim_regs))
553 /* Now restore our arg pointer from the address at which it
554 was saved in our stack frame.
555 If there hasn't be space allocated for it yet, make
557 if (arg_pointer_save_area == 0)
558 arg_pointer_save_area
559 = assign_stack_local (Pmode, GET_MODE_SIZE (Pmode), 0);
560 emit_move_insn (virtual_incoming_args_rtx,
561 copy_to_reg (arg_pointer_save_area));
566 #ifdef HAVE_builtin_setjmp_receiver
567 if (HAVE_builtin_setjmp_receiver)
568 emit_insn (gen_builtin_setjmp_receiver (receiver_label));
571 #ifdef HAVE_nonlocal_goto_receiver
572 if (HAVE_nonlocal_goto_receiver)
573 emit_insn (gen_nonlocal_goto_receiver ());
578 /* @@@ This is a kludge. Not all machine descriptions define a blockage
579 insn, but we must not allow the code we just generated to be reordered
580 by scheduling. Specifically, the update of the frame pointer must
581 happen immediately, not later. So emit an ASM_INPUT to act as blockage
583 emit_insn (gen_rtx_ASM_INPUT (VOIDmode, ""));
586 /* __builtin_setjmp is passed a pointer to an array of five words (not
587 all will be used on all machines). It operates similarly to the C
588 library function of the same name, but is more efficient. Much of
589 the code below (and for longjmp) is copied from the handling of
592 NOTE: This is intended for use by GNAT and the exception handling
593 scheme in the compiler and will only work in the method used by
597 expand_builtin_setjmp (arglist, target)
601 rtx buf_addr, next_lab, cont_lab;
603 if (!validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
606 if (target == 0 || GET_CODE (target) != REG
607 || REGNO (target) < FIRST_PSEUDO_REGISTER)
608 target = gen_reg_rtx (TYPE_MODE (integer_type_node));
610 buf_addr = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
612 next_lab = gen_label_rtx ();
613 cont_lab = gen_label_rtx ();
615 expand_builtin_setjmp_setup (buf_addr, next_lab);
617 /* Set TARGET to zero and branch to the continue label. */
618 emit_move_insn (target, const0_rtx);
619 emit_jump_insn (gen_jump (cont_lab));
621 emit_label (next_lab);
623 expand_builtin_setjmp_receiver (next_lab);
625 /* Set TARGET to one. */
626 emit_move_insn (target, const1_rtx);
627 emit_label (cont_lab);
629 /* Tell flow about the strange goings on. Putting `next_lab' on
630 `nonlocal_goto_handler_labels' to indicates that function
631 calls may traverse the arc back to this label. */
633 current_function_has_nonlocal_label = 1;
634 nonlocal_goto_handler_labels
635 = gen_rtx_EXPR_LIST (VOIDmode, next_lab, nonlocal_goto_handler_labels);
640 /* __builtin_longjmp is passed a pointer to an array of five words (not
641 all will be used on all machines). It operates similarly to the C
642 library function of the same name, but is more efficient. Much of
643 the code below is copied from the handling of non-local gotos.
645 NOTE: This is intended for use by GNAT and the exception handling
646 scheme in the compiler and will only work in the method used by
650 expand_builtin_longjmp (buf_addr, value)
653 rtx fp, lab, stack, insn;
654 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
656 if (setjmp_alias_set == -1)
657 setjmp_alias_set = new_alias_set ();
659 #ifdef POINTERS_EXTEND_UNSIGNED
660 buf_addr = convert_memory_address (Pmode, buf_addr);
662 buf_addr = force_reg (Pmode, buf_addr);
664 /* We used to store value in static_chain_rtx, but that fails if pointers
665 are smaller than integers. We instead require that the user must pass
666 a second argument of 1, because that is what builtin_setjmp will
667 return. This also makes EH slightly more efficient, since we are no
668 longer copying around a value that we don't care about. */
669 if (value != const1_rtx)
672 current_function_calls_longjmp = 1;
674 #ifdef HAVE_builtin_longjmp
675 if (HAVE_builtin_longjmp)
676 emit_insn (gen_builtin_longjmp (buf_addr));
680 fp = gen_rtx_MEM (Pmode, buf_addr);
681 lab = gen_rtx_MEM (Pmode, plus_constant (buf_addr,
682 GET_MODE_SIZE (Pmode)));
684 stack = gen_rtx_MEM (sa_mode, plus_constant (buf_addr,
685 2 * GET_MODE_SIZE (Pmode)));
686 MEM_ALIAS_SET (fp) = MEM_ALIAS_SET (lab) = MEM_ALIAS_SET (stack)
689 /* Pick up FP, label, and SP from the block and jump. This code is
690 from expand_goto in stmt.c; see there for detailed comments. */
691 #if HAVE_nonlocal_goto
692 if (HAVE_nonlocal_goto)
693 /* We have to pass a value to the nonlocal_goto pattern that will
694 get copied into the static_chain pointer, but it does not matter
695 what that value is, because builtin_setjmp does not use it. */
696 emit_insn (gen_nonlocal_goto (value, fp, stack, lab));
700 lab = copy_to_reg (lab);
702 emit_move_insn (hard_frame_pointer_rtx, fp);
703 emit_stack_restore (SAVE_NONLOCAL, stack, NULL_RTX);
705 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
706 emit_insn (gen_rtx_USE (VOIDmode, stack_pointer_rtx));
707 emit_indirect_jump (lab);
711 /* Search backwards and mark the jump insn as a non-local goto.
712 Note that this precludes the use of __builtin_longjmp to a
713 __builtin_setjmp target in the same function. However, we've
714 already cautioned the user that these functions are for
715 internal exception handling use only. */
716 for (insn = get_last_insn (); insn; insn = PREV_INSN (insn))
718 if (GET_CODE (insn) == JUMP_INSN)
720 REG_NOTES (insn) = alloc_EXPR_LIST (REG_NON_LOCAL_GOTO, const0_rtx,
724 else if (GET_CODE (insn) == CALL_INSN)
729 /* Get a MEM rtx for expression EXP which is the address of an operand
730 to be used to be used in a string instruction (cmpstrsi, movstrsi, ..). */
736 rtx mem = gen_rtx_MEM (BLKmode,
737 memory_address (BLKmode,
738 expand_expr (exp, NULL_RTX,
739 ptr_mode, EXPAND_SUM)));
741 /* Get an expression we can use to find the attributes to assign to MEM.
742 If it is an ADDR_EXPR, use the operand. Otherwise, dereference it if
743 we can. First remove any nops. */
744 while ((TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
745 || TREE_CODE (exp) == NON_LVALUE_EXPR)
746 && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (exp, 0))))
747 exp = TREE_OPERAND (exp, 0);
749 if (TREE_CODE (exp) == ADDR_EXPR)
750 exp = TREE_OPERAND (exp, 0);
751 else if (POINTER_TYPE_P (TREE_TYPE (exp)))
752 exp = build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (exp)), exp);
756 set_mem_attributes (mem, exp, 0);
758 /* memcpy, memset and other builtin stringops can alias with anything. */
759 MEM_ALIAS_SET (mem) = 0;
763 /* Built-in functions to perform an untyped call and return. */
765 /* For each register that may be used for calling a function, this
766 gives a mode used to copy the register's value. VOIDmode indicates
767 the register is not used for calling a function. If the machine
768 has register windows, this gives only the outbound registers.
769 INCOMING_REGNO gives the corresponding inbound register. */
770 static enum machine_mode apply_args_mode[FIRST_PSEUDO_REGISTER];
772 /* For each register that may be used for returning values, this gives
773 a mode used to copy the register's value. VOIDmode indicates the
774 register is not used for returning values. If the machine has
775 register windows, this gives only the outbound registers.
776 INCOMING_REGNO gives the corresponding inbound register. */
777 static enum machine_mode apply_result_mode[FIRST_PSEUDO_REGISTER];
779 /* For each register that may be used for calling a function, this
780 gives the offset of that register into the block returned by
781 __builtin_apply_args. 0 indicates that the register is not
782 used for calling a function. */
783 static int apply_args_reg_offset[FIRST_PSEUDO_REGISTER];
785 /* Return the offset of register REGNO into the block returned by
786 __builtin_apply_args. This is not declared static, since it is
787 needed in objc-act.c. */
790 apply_args_register_offset (regno)
795 /* Arguments are always put in outgoing registers (in the argument
796 block) if such make sense. */
797 #ifdef OUTGOING_REGNO
798 regno = OUTGOING_REGNO(regno);
800 return apply_args_reg_offset[regno];
803 /* Return the size required for the block returned by __builtin_apply_args,
804 and initialize apply_args_mode. */
809 static int size = -1;
811 enum machine_mode mode;
813 /* The values computed by this function never change. */
816 /* The first value is the incoming arg-pointer. */
817 size = GET_MODE_SIZE (Pmode);
819 /* The second value is the structure value address unless this is
820 passed as an "invisible" first argument. */
821 if (struct_value_rtx)
822 size += GET_MODE_SIZE (Pmode);
824 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
825 if (FUNCTION_ARG_REGNO_P (regno))
827 /* Search for the proper mode for copying this register's
828 value. I'm not sure this is right, but it works so far. */
829 enum machine_mode best_mode = VOIDmode;
831 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
833 mode = GET_MODE_WIDER_MODE (mode))
834 if (HARD_REGNO_MODE_OK (regno, mode)
835 && HARD_REGNO_NREGS (regno, mode) == 1)
838 if (best_mode == VOIDmode)
839 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
841 mode = GET_MODE_WIDER_MODE (mode))
842 if (HARD_REGNO_MODE_OK (regno, mode)
843 && (mov_optab->handlers[(int) mode].insn_code
844 != CODE_FOR_nothing))
848 if (mode == VOIDmode)
851 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
852 if (size % align != 0)
853 size = CEIL (size, align) * align;
854 apply_args_reg_offset[regno] = size;
855 size += GET_MODE_SIZE (mode);
856 apply_args_mode[regno] = mode;
860 apply_args_mode[regno] = VOIDmode;
861 apply_args_reg_offset[regno] = 0;
867 /* Return the size required for the block returned by __builtin_apply,
868 and initialize apply_result_mode. */
873 static int size = -1;
875 enum machine_mode mode;
877 /* The values computed by this function never change. */
882 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
883 if (FUNCTION_VALUE_REGNO_P (regno))
885 /* Search for the proper mode for copying this register's
886 value. I'm not sure this is right, but it works so far. */
887 enum machine_mode best_mode = VOIDmode;
889 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
891 mode = GET_MODE_WIDER_MODE (mode))
892 if (HARD_REGNO_MODE_OK (regno, mode))
895 if (best_mode == VOIDmode)
896 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
898 mode = GET_MODE_WIDER_MODE (mode))
899 if (HARD_REGNO_MODE_OK (regno, mode)
900 && (mov_optab->handlers[(int) mode].insn_code
901 != CODE_FOR_nothing))
905 if (mode == VOIDmode)
908 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
909 if (size % align != 0)
910 size = CEIL (size, align) * align;
911 size += GET_MODE_SIZE (mode);
912 apply_result_mode[regno] = mode;
915 apply_result_mode[regno] = VOIDmode;
917 /* Allow targets that use untyped_call and untyped_return to override
918 the size so that machine-specific information can be stored here. */
919 #ifdef APPLY_RESULT_SIZE
920 size = APPLY_RESULT_SIZE;
926 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
927 /* Create a vector describing the result block RESULT. If SAVEP is true,
928 the result block is used to save the values; otherwise it is used to
929 restore the values. */
932 result_vector (savep, result)
936 int regno, size, align, nelts;
937 enum machine_mode mode;
939 rtx *savevec = (rtx *) alloca (FIRST_PSEUDO_REGISTER * sizeof (rtx));
942 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
943 if ((mode = apply_result_mode[regno]) != VOIDmode)
945 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
946 if (size % align != 0)
947 size = CEIL (size, align) * align;
948 reg = gen_rtx_REG (mode, savep ? regno : INCOMING_REGNO (regno));
949 mem = change_address (result, mode,
950 plus_constant (XEXP (result, 0), size));
951 savevec[nelts++] = (savep
952 ? gen_rtx_SET (VOIDmode, mem, reg)
953 : gen_rtx_SET (VOIDmode, reg, mem));
954 size += GET_MODE_SIZE (mode);
956 return gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (nelts, savevec));
958 #endif /* HAVE_untyped_call or HAVE_untyped_return */
960 /* Save the state required to perform an untyped call with the same
961 arguments as were passed to the current function. */
964 expand_builtin_apply_args_1 ()
967 int size, align, regno;
968 enum machine_mode mode;
970 /* Create a block where the arg-pointer, structure value address,
971 and argument registers can be saved. */
972 registers = assign_stack_local (BLKmode, apply_args_size (), -1);
974 /* Walk past the arg-pointer and structure value address. */
975 size = GET_MODE_SIZE (Pmode);
976 if (struct_value_rtx)
977 size += GET_MODE_SIZE (Pmode);
979 /* Save each register used in calling a function to the block. */
980 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
981 if ((mode = apply_args_mode[regno]) != VOIDmode)
985 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
986 if (size % align != 0)
987 size = CEIL (size, align) * align;
989 tem = gen_rtx_REG (mode, INCOMING_REGNO (regno));
991 emit_move_insn (change_address (registers, mode,
992 plus_constant (XEXP (registers, 0),
995 size += GET_MODE_SIZE (mode);
998 /* Save the arg pointer to the block. */
999 emit_move_insn (change_address (registers, Pmode, XEXP (registers, 0)),
1000 copy_to_reg (virtual_incoming_args_rtx));
1001 size = GET_MODE_SIZE (Pmode);
1003 /* Save the structure value address unless this is passed as an
1004 "invisible" first argument. */
1005 if (struct_value_incoming_rtx)
1007 emit_move_insn (change_address (registers, Pmode,
1008 plus_constant (XEXP (registers, 0),
1010 copy_to_reg (struct_value_incoming_rtx));
1011 size += GET_MODE_SIZE (Pmode);
1014 /* Return the address of the block. */
1015 return copy_addr_to_reg (XEXP (registers, 0));
1018 /* __builtin_apply_args returns block of memory allocated on
1019 the stack into which is stored the arg pointer, structure
1020 value address, static chain, and all the registers that might
1021 possibly be used in performing a function call. The code is
1022 moved to the start of the function so the incoming values are
1025 expand_builtin_apply_args ()
1027 /* Don't do __builtin_apply_args more than once in a function.
1028 Save the result of the first call and reuse it. */
1029 if (apply_args_value != 0)
1030 return apply_args_value;
1032 /* When this function is called, it means that registers must be
1033 saved on entry to this function. So we migrate the
1034 call to the first insn of this function. */
1039 temp = expand_builtin_apply_args_1 ();
1043 apply_args_value = temp;
1045 /* Put the sequence after the NOTE that starts the function.
1046 If this is inside a SEQUENCE, make the outer-level insn
1047 chain current, so the code is placed at the start of the
1049 push_topmost_sequence ();
1050 emit_insns_before (seq, NEXT_INSN (get_insns ()));
1051 pop_topmost_sequence ();
1056 /* Perform an untyped call and save the state required to perform an
1057 untyped return of whatever value was returned by the given function. */
1060 expand_builtin_apply (function, arguments, argsize)
1061 rtx function, arguments, argsize;
1063 int size, align, regno;
1064 enum machine_mode mode;
1065 rtx incoming_args, result, reg, dest, call_insn;
1066 rtx old_stack_level = 0;
1067 rtx call_fusage = 0;
1069 /* Create a block where the return registers can be saved. */
1070 result = assign_stack_local (BLKmode, apply_result_size (), -1);
1072 /* Fetch the arg pointer from the ARGUMENTS block. */
1073 incoming_args = gen_reg_rtx (Pmode);
1074 emit_move_insn (incoming_args,
1075 gen_rtx_MEM (Pmode, arguments));
1076 #ifndef STACK_GROWS_DOWNWARD
1077 incoming_args = expand_binop (Pmode, sub_optab, incoming_args, argsize,
1078 incoming_args, 0, OPTAB_LIB_WIDEN);
1081 /* Perform postincrements before actually calling the function. */
1084 /* Push a new argument block and copy the arguments. Do not allow
1085 the (potential) memcpy call below to interfere with our stack
1087 do_pending_stack_adjust ();
1090 /* Save the stack with nonlocal if available */
1091 #ifdef HAVE_save_stack_nonlocal
1092 if (HAVE_save_stack_nonlocal)
1093 emit_stack_save (SAVE_NONLOCAL, &old_stack_level, NULL_RTX);
1096 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
1098 /* Push a block of memory onto the stack to store the memory arguments.
1099 Save the address in a register, and copy the memory arguments. ??? I
1100 haven't figured out how the calling convention macros effect this,
1101 but it's likely that the source and/or destination addresses in
1102 the block copy will need updating in machine specific ways. */
1103 dest = allocate_dynamic_stack_space (argsize, 0, BITS_PER_UNIT);
1104 emit_block_move (gen_rtx_MEM (BLKmode, dest),
1105 gen_rtx_MEM (BLKmode, incoming_args),
1106 argsize, PARM_BOUNDARY);
1108 /* Refer to the argument block. */
1110 arguments = gen_rtx_MEM (BLKmode, arguments);
1112 /* Walk past the arg-pointer and structure value address. */
1113 size = GET_MODE_SIZE (Pmode);
1114 if (struct_value_rtx)
1115 size += GET_MODE_SIZE (Pmode);
1117 /* Restore each of the registers previously saved. Make USE insns
1118 for each of these registers for use in making the call. */
1119 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1120 if ((mode = apply_args_mode[regno]) != VOIDmode)
1122 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1123 if (size % align != 0)
1124 size = CEIL (size, align) * align;
1125 reg = gen_rtx_REG (mode, regno);
1126 emit_move_insn (reg,
1127 change_address (arguments, mode,
1128 plus_constant (XEXP (arguments, 0),
1131 use_reg (&call_fusage, reg);
1132 size += GET_MODE_SIZE (mode);
1135 /* Restore the structure value address unless this is passed as an
1136 "invisible" first argument. */
1137 size = GET_MODE_SIZE (Pmode);
1138 if (struct_value_rtx)
1140 rtx value = gen_reg_rtx (Pmode);
1141 emit_move_insn (value,
1142 change_address (arguments, Pmode,
1143 plus_constant (XEXP (arguments, 0),
1145 emit_move_insn (struct_value_rtx, value);
1146 if (GET_CODE (struct_value_rtx) == REG)
1147 use_reg (&call_fusage, struct_value_rtx);
1148 size += GET_MODE_SIZE (Pmode);
1151 /* All arguments and registers used for the call are set up by now! */
1152 function = prepare_call_address (function, NULL_TREE, &call_fusage, 0);
1154 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
1155 and we don't want to load it into a register as an optimization,
1156 because prepare_call_address already did it if it should be done. */
1157 if (GET_CODE (function) != SYMBOL_REF)
1158 function = memory_address (FUNCTION_MODE, function);
1160 /* Generate the actual call instruction and save the return value. */
1161 #ifdef HAVE_untyped_call
1162 if (HAVE_untyped_call)
1163 emit_call_insn (gen_untyped_call (gen_rtx_MEM (FUNCTION_MODE, function),
1164 result, result_vector (1, result)));
1167 #ifdef HAVE_call_value
1168 if (HAVE_call_value)
1172 /* Locate the unique return register. It is not possible to
1173 express a call that sets more than one return register using
1174 call_value; use untyped_call for that. In fact, untyped_call
1175 only needs to save the return registers in the given block. */
1176 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1177 if ((mode = apply_result_mode[regno]) != VOIDmode)
1180 abort (); /* HAVE_untyped_call required. */
1181 valreg = gen_rtx_REG (mode, regno);
1184 emit_call_insn (GEN_CALL_VALUE (valreg,
1185 gen_rtx_MEM (FUNCTION_MODE, function),
1186 const0_rtx, NULL_RTX, const0_rtx));
1188 emit_move_insn (change_address (result, GET_MODE (valreg),
1196 /* Find the CALL insn we just emitted. */
1197 for (call_insn = get_last_insn ();
1198 call_insn && GET_CODE (call_insn) != CALL_INSN;
1199 call_insn = PREV_INSN (call_insn))
1205 /* Put the register usage information on the CALL. If there is already
1206 some usage information, put ours at the end. */
1207 if (CALL_INSN_FUNCTION_USAGE (call_insn))
1211 for (link = CALL_INSN_FUNCTION_USAGE (call_insn); XEXP (link, 1) != 0;
1212 link = XEXP (link, 1))
1215 XEXP (link, 1) = call_fusage;
1218 CALL_INSN_FUNCTION_USAGE (call_insn) = call_fusage;
1220 /* Restore the stack. */
1221 #ifdef HAVE_save_stack_nonlocal
1222 if (HAVE_save_stack_nonlocal)
1223 emit_stack_restore (SAVE_NONLOCAL, old_stack_level, NULL_RTX);
1226 emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX);
1230 /* Return the address of the result block. */
1231 return copy_addr_to_reg (XEXP (result, 0));
1234 /* Perform an untyped return. */
1237 expand_builtin_return (result)
1240 int size, align, regno;
1241 enum machine_mode mode;
1243 rtx call_fusage = 0;
1245 apply_result_size ();
1246 result = gen_rtx_MEM (BLKmode, result);
1248 #ifdef HAVE_untyped_return
1249 if (HAVE_untyped_return)
1251 emit_jump_insn (gen_untyped_return (result, result_vector (0, result)));
1257 /* Restore the return value and note that each value is used. */
1259 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1260 if ((mode = apply_result_mode[regno]) != VOIDmode)
1262 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1263 if (size % align != 0)
1264 size = CEIL (size, align) * align;
1265 reg = gen_rtx_REG (mode, INCOMING_REGNO (regno));
1266 emit_move_insn (reg,
1267 change_address (result, mode,
1268 plus_constant (XEXP (result, 0),
1271 push_to_sequence (call_fusage);
1272 emit_insn (gen_rtx_USE (VOIDmode, reg));
1273 call_fusage = get_insns ();
1275 size += GET_MODE_SIZE (mode);
1278 /* Put the USE insns before the return. */
1279 emit_insns (call_fusage);
1281 /* Return whatever values was restored by jumping directly to the end
1283 expand_null_return ();
1286 /* Expand a call to __builtin_classify_type with arguments found in
1289 expand_builtin_classify_type (arglist)
1294 tree type = TREE_TYPE (TREE_VALUE (arglist));
1295 enum tree_code code = TREE_CODE (type);
1296 if (code == VOID_TYPE)
1297 return GEN_INT (void_type_class);
1298 if (code == INTEGER_TYPE)
1299 return GEN_INT (integer_type_class);
1300 if (code == CHAR_TYPE)
1301 return GEN_INT (char_type_class);
1302 if (code == ENUMERAL_TYPE)
1303 return GEN_INT (enumeral_type_class);
1304 if (code == BOOLEAN_TYPE)
1305 return GEN_INT (boolean_type_class);
1306 if (code == POINTER_TYPE)
1307 return GEN_INT (pointer_type_class);
1308 if (code == REFERENCE_TYPE)
1309 return GEN_INT (reference_type_class);
1310 if (code == OFFSET_TYPE)
1311 return GEN_INT (offset_type_class);
1312 if (code == REAL_TYPE)
1313 return GEN_INT (real_type_class);
1314 if (code == COMPLEX_TYPE)
1315 return GEN_INT (complex_type_class);
1316 if (code == FUNCTION_TYPE)
1317 return GEN_INT (function_type_class);
1318 if (code == METHOD_TYPE)
1319 return GEN_INT (method_type_class);
1320 if (code == RECORD_TYPE)
1321 return GEN_INT (record_type_class);
1322 if (code == UNION_TYPE || code == QUAL_UNION_TYPE)
1323 return GEN_INT (union_type_class);
1324 if (code == ARRAY_TYPE)
1326 if (TYPE_STRING_FLAG (type))
1327 return GEN_INT (string_type_class);
1329 return GEN_INT (array_type_class);
1331 if (code == SET_TYPE)
1332 return GEN_INT (set_type_class);
1333 if (code == FILE_TYPE)
1334 return GEN_INT (file_type_class);
1335 if (code == LANG_TYPE)
1336 return GEN_INT (lang_type_class);
1338 return GEN_INT (no_type_class);
1341 /* Expand expression EXP, which is a call to __builtin_constant_p. */
1343 expand_builtin_constant_p (exp)
1346 tree arglist = TREE_OPERAND (exp, 1);
1347 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1352 arglist = TREE_VALUE (arglist);
1354 /* We have taken care of the easy cases during constant folding. This
1355 case is not obvious, so emit (constant_p_rtx (ARGLIST)) and let CSE get a
1356 chance to see if it can deduce whether ARGLIST is constant. */
1358 tmp = expand_expr (arglist, NULL_RTX, VOIDmode, 0);
1359 tmp = gen_rtx_CONSTANT_P_RTX (value_mode, tmp);
1363 /* Expand a call to one of the builtin math functions (sin, cos, or sqrt).
1364 Return 0 if a normal call should be emitted rather than expanding the
1365 function in-line. EXP is the expression that is a call to the builtin
1366 function; if convenient, the result should be placed in TARGET.
1367 SUBTARGET may be used as the target for computing one of EXP's operands. */
1369 expand_builtin_mathfn (exp, target, subtarget)
1371 rtx target, subtarget;
1373 optab builtin_optab;
1375 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
1376 tree arglist = TREE_OPERAND (exp, 1);
1378 if (!validate_arglist (arglist, REAL_TYPE, VOID_TYPE))
1381 /* Stabilize and compute the argument. */
1382 if (TREE_CODE (TREE_VALUE (arglist)) != VAR_DECL
1383 && TREE_CODE (TREE_VALUE (arglist)) != PARM_DECL)
1385 exp = copy_node (exp);
1386 TREE_OPERAND (exp, 1) = arglist;
1387 /* Wrap the computation of the argument in a SAVE_EXPR. That
1388 way, if we need to expand the argument again (as in the
1389 flag_errno_math case below where we cannot directly set
1390 errno), we will not perform side-effects more than once.
1391 Note that here we're mutating the original EXP as well as the
1392 copy; that's the right thing to do in case the original EXP
1393 is expanded later. */
1394 TREE_VALUE (arglist) = save_expr (TREE_VALUE (arglist));
1395 arglist = copy_node (arglist);
1397 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
1399 /* Make a suitable register to place result in. */
1400 target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));
1405 switch (DECL_FUNCTION_CODE (fndecl))
1410 builtin_optab = sin_optab; break;
1414 builtin_optab = cos_optab; break;
1415 case BUILT_IN_FSQRT:
1416 case BUILT_IN_SQRTF:
1417 case BUILT_IN_SQRTL:
1418 builtin_optab = sqrt_optab; break;
1423 /* Compute into TARGET.
1424 Set TARGET to wherever the result comes back. */
1425 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
1426 builtin_optab, op0, target, 0);
1428 /* If we were unable to expand via the builtin, stop the
1429 sequence (without outputting the insns) and return 0, causing
1430 a call to the library function. */
1437 /* If errno must be maintained and if we are not allowing unsafe
1438 math optimizations, check the result. */
1440 if (flag_errno_math && ! flag_unsafe_math_optimizations)
1444 /* Don't define the builtin FP instructions
1445 if your machine is not IEEE. */
1446 if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT)
1449 lab1 = gen_label_rtx ();
1451 /* Test the result; if it is NaN, set errno=EDOM because
1452 the argument was not in the domain. */
1453 emit_cmp_and_jump_insns (target, target, EQ, 0, GET_MODE (target),
1458 #ifdef GEN_ERRNO_RTX
1459 rtx errno_rtx = GEN_ERRNO_RTX;
1462 = gen_rtx_MEM (word_mode, gen_rtx_SYMBOL_REF (Pmode, "errno"));
1465 emit_move_insn (errno_rtx, GEN_INT (TARGET_EDOM));
1468 /* We can't set errno=EDOM directly; let the library call do it.
1469 Pop the arguments right away in case the call gets deleted. */
1471 expand_call (exp, target, 0);
1478 /* Output the entire sequence. */
1479 insns = get_insns ();
1486 /* Expand expression EXP which is a call to the strlen builtin. Return 0
1487 if we failed the caller should emit a normal call, otherwise
1488 try to get the result in TARGET, if convenient. */
1491 expand_builtin_strlen (exp, target)
1495 tree arglist = TREE_OPERAND (exp, 1);
1496 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1498 if (!validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
1503 tree src = TREE_VALUE (arglist);
1506 = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1508 rtx result, src_reg, char_rtx, before_strlen;
1509 enum machine_mode insn_mode = value_mode, char_mode;
1510 enum insn_code icode = CODE_FOR_nothing;
1512 /* If SRC is not a pointer type, don't do this operation inline. */
1516 /* Bail out if we can't compute strlen in the right mode. */
1517 while (insn_mode != VOIDmode)
1519 icode = strlen_optab->handlers[(int) insn_mode].insn_code;
1520 if (icode != CODE_FOR_nothing)
1523 insn_mode = GET_MODE_WIDER_MODE (insn_mode);
1525 if (insn_mode == VOIDmode)
1528 /* Make a place to write the result of the instruction. */
1531 && GET_CODE (result) == REG
1532 && GET_MODE (result) == insn_mode
1533 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
1534 result = gen_reg_rtx (insn_mode);
1536 /* Make a place to hold the source address. We will not expand
1537 the actual source until we are sure that the expansion will
1538 not fail -- there are trees that cannot be expanded twice. */
1539 src_reg = gen_reg_rtx (Pmode);
1541 /* Mark the beginning of the strlen sequence so we can emit the
1542 source operand later. */
1543 before_strlen = get_last_insn();
1545 /* Check the string is readable and has an end. */
1546 if (current_function_check_memory_usage)
1547 emit_library_call (chkr_check_str_libfunc, LCT_CONST_MAKE_BLOCK,
1548 VOIDmode, 2, src_reg, Pmode,
1549 GEN_INT (MEMORY_USE_RO),
1550 TYPE_MODE (integer_type_node));
1552 char_rtx = const0_rtx;
1553 char_mode = insn_data[(int) icode].operand[2].mode;
1554 if (! (*insn_data[(int) icode].operand[2].predicate) (char_rtx,
1556 char_rtx = copy_to_mode_reg (char_mode, char_rtx);
1558 pat = GEN_FCN (icode) (result, gen_rtx_MEM (BLKmode, src_reg),
1559 char_rtx, GEN_INT (align));
1564 /* Now that we are assured of success, expand the source. */
1566 pat = memory_address (BLKmode,
1567 expand_expr (src, src_reg, ptr_mode, EXPAND_SUM));
1569 emit_move_insn (src_reg, pat);
1570 pat = gen_sequence ();
1574 emit_insn_after (pat, before_strlen);
1576 emit_insn_before (pat, get_insns ());
1578 /* Return the value in the proper mode for this function. */
1579 if (GET_MODE (result) == value_mode)
1581 else if (target != 0)
1582 convert_move (target, result, 0);
1584 target = convert_to_mode (value_mode, result, 0);
1590 /* Expand a call to the strstr builtin. Return 0 if we failed the
1591 caller should emit a normal call, otherwise try to get the result
1592 in TARGET, if convenient (and in mode MODE if that's convenient). */
1595 expand_builtin_strstr (arglist, target, mode)
1598 enum machine_mode mode;
1600 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
1601 || current_function_check_memory_usage)
1605 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1607 const char *p1, *p2;
1616 const char *r = strstr (p1, p2);
1621 /* Return an offset into the constant string argument. */
1622 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1623 s1, ssize_int (r - p1))),
1624 target, mode, EXPAND_NORMAL);
1628 return expand_expr (s1, target, mode, EXPAND_NORMAL);
1633 fn = built_in_decls[BUILT_IN_STRCHR];
1637 /* New argument list transforming strstr(s1, s2) to
1638 strchr(s1, s2[0]). */
1640 build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
1641 arglist = tree_cons (NULL_TREE, s1, arglist);
1642 return expand_expr (build_function_call_expr (fn, arglist),
1643 target, mode, EXPAND_NORMAL);
1647 /* Expand a call to the strchr builtin. Return 0 if we failed the
1648 caller should emit a normal call, otherwise try to get the result
1649 in TARGET, if convenient (and in mode MODE if that's convenient). */
1652 expand_builtin_strchr (arglist, target, mode)
1655 enum machine_mode mode;
1657 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
1658 || current_function_check_memory_usage)
1662 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1665 if (TREE_CODE (s2) != INTEGER_CST)
1674 if (target_char_cast (s2, &c))
1682 /* Return an offset into the constant string argument. */
1683 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1684 s1, ssize_int (r - p1))),
1685 target, mode, EXPAND_NORMAL);
1688 /* FIXME: Should use here strchrM optab so that ports can optimize
1694 /* Expand a call to the strrchr builtin. Return 0 if we failed the
1695 caller should emit a normal call, otherwise try to get the result
1696 in TARGET, if convenient (and in mode MODE if that's convenient). */
1699 expand_builtin_strrchr (arglist, target, mode)
1702 enum machine_mode mode;
1704 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
1705 || current_function_check_memory_usage)
1709 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1713 if (TREE_CODE (s2) != INTEGER_CST)
1722 if (target_char_cast (s2, &c))
1725 r = strrchr (p1, c);
1730 /* Return an offset into the constant string argument. */
1731 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1732 s1, ssize_int (r - p1))),
1733 target, mode, EXPAND_NORMAL);
1736 if (! integer_zerop (s2))
1739 fn = built_in_decls[BUILT_IN_STRCHR];
1743 /* Transform strrchr(s1, '\0') to strchr(s1, '\0'). */
1744 return expand_expr (build_function_call_expr (fn, arglist),
1745 target, mode, EXPAND_NORMAL);
1749 /* Expand a call to the strpbrk builtin. Return 0 if we failed the
1750 caller should emit a normal call, otherwise try to get the result
1751 in TARGET, if convenient (and in mode MODE if that's convenient). */
1754 expand_builtin_strpbrk (arglist, target, mode)
1757 enum machine_mode mode;
1759 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
1760 || current_function_check_memory_usage)
1764 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
1766 const char *p1, *p2;
1775 const char *r = strpbrk (p1, p2);
1780 /* Return an offset into the constant string argument. */
1781 return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
1782 s1, ssize_int (r - p1))),
1783 target, mode, EXPAND_NORMAL);
1788 /* strpbrk(x, "") == NULL.
1789 Evaluate and ignore the arguments in case they had
1791 expand_expr (s1, const0_rtx, VOIDmode, EXPAND_NORMAL);
1796 return 0; /* Really call strpbrk. */
1798 fn = built_in_decls[BUILT_IN_STRCHR];
1802 /* New argument list transforming strpbrk(s1, s2) to
1803 strchr(s1, s2[0]). */
1805 build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
1806 arglist = tree_cons (NULL_TREE, s1, arglist);
1807 return expand_expr (build_function_call_expr (fn, arglist),
1808 target, mode, EXPAND_NORMAL);
1812 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1813 bytes from constant string DATA + OFFSET and return it as target
1817 builtin_memcpy_read_str (data, offset, mode)
1819 HOST_WIDE_INT offset;
1820 enum machine_mode mode;
1822 const char *str = (const char *) data;
1824 if (offset + GET_MODE_SIZE (mode) > strlen (str) + 1)
1825 abort (); /* Attempt to read past the end of constant string. */
1827 return c_readstr (str + offset, mode);
1830 /* Expand a call to the memcpy builtin, with arguments in ARGLIST. */
1832 expand_builtin_memcpy (arglist)
1835 if (!validate_arglist (arglist,
1836 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
1840 tree dest = TREE_VALUE (arglist);
1841 tree src = TREE_VALUE (TREE_CHAIN (arglist));
1842 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1843 const char *src_str;
1845 int src_align = get_pointer_alignment (src, BIGGEST_ALIGNMENT);
1846 int dest_align = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
1847 rtx dest_mem, src_mem, dest_addr, len_rtx;
1849 /* If either SRC or DEST is not a pointer type, don't do
1850 this operation in-line. */
1851 if (src_align == 0 || dest_align == 0)
1854 dest_mem = get_memory_rtx (dest);
1855 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
1856 src_str = c_getstr (src);
1858 /* If SRC is a string constant and block move would be done
1859 by pieces, we can avoid loading the string from memory
1860 and only stored the computed constants. */
1862 && !current_function_check_memory_usage
1863 && GET_CODE (len_rtx) == CONST_INT
1864 && (unsigned HOST_WIDE_INT) INTVAL (len_rtx) <= strlen (src_str) + 1
1865 && can_store_by_pieces (INTVAL (len_rtx), builtin_memcpy_read_str,
1866 (PTR) src_str, dest_align))
1868 store_by_pieces (dest_mem, INTVAL (len_rtx),
1869 builtin_memcpy_read_str,
1870 (PTR) src_str, dest_align);
1871 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
1874 src_mem = get_memory_rtx (src);
1876 /* Just copy the rights of SRC to the rights of DEST. */
1877 if (current_function_check_memory_usage)
1878 emit_library_call (chkr_copy_bitmap_libfunc, LCT_CONST_MAKE_BLOCK,
1879 VOIDmode, 3, XEXP (dest_mem, 0), Pmode,
1880 XEXP (src_mem, 0), Pmode,
1881 len_rtx, TYPE_MODE (sizetype));
1883 /* Copy word part most expediently. */
1885 = emit_block_move (dest_mem, src_mem, len_rtx,
1886 MIN (src_align, dest_align));
1889 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
1895 /* Expand expression EXP, which is a call to the strcpy builtin. Return 0
1896 if we failed the caller should emit a normal call. */
1899 expand_builtin_strcpy (exp)
1902 tree arglist = TREE_OPERAND (exp, 1);
1905 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
1909 tree len = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
1914 len = size_binop (PLUS_EXPR, len, ssize_int (1));
1915 chainon (arglist, build_tree_list (NULL_TREE, len));
1918 result = expand_builtin_memcpy (arglist);
1921 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
1925 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
1926 bytes from constant string DATA + OFFSET and return it as target
1930 builtin_strncpy_read_str (data, offset, mode)
1932 HOST_WIDE_INT offset;
1933 enum machine_mode mode;
1935 const char *str = (const char *) data;
1937 if ((unsigned HOST_WIDE_INT) offset > strlen (str))
1940 return c_readstr (str + offset, mode);
1943 /* Expand expression EXP, which is a call to the strncpy builtin. Return 0
1944 if we failed the caller should emit a normal call. */
1947 expand_builtin_strncpy (arglist, target, mode)
1950 enum machine_mode mode;
1952 if (!validate_arglist (arglist,
1953 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
1957 tree slen = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
1958 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1960 /* We must be passed a constant len parameter. */
1961 if (TREE_CODE (len) != INTEGER_CST)
1964 /* If the len parameter is zero, return the dst parameter. */
1965 if (compare_tree_int (len, 0) == 0)
1967 /* Evaluate and ignore the src argument in case it has
1969 expand_expr (TREE_VALUE (TREE_CHAIN (arglist)), const0_rtx,
1970 VOIDmode, EXPAND_NORMAL);
1971 /* Return the dst parameter. */
1972 return expand_expr (TREE_VALUE (arglist), target, mode,
1976 /* Now, we must be passed a constant src ptr parameter. */
1977 if (slen == 0 || TREE_CODE (slen) != INTEGER_CST)
1980 slen = size_binop (PLUS_EXPR, slen, ssize_int (1));
1982 /* We're required to pad with trailing zeros if the requested
1983 len is greater than strlen(s2)+1. In that case try to
1984 use store_by_pieces, if it fails, punt. */
1985 if (tree_int_cst_lt (slen, len))
1987 tree dest = TREE_VALUE (arglist);
1988 int dest_align = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
1989 const char *p = c_getstr (TREE_VALUE (TREE_CHAIN (arglist)));
1992 if (!p || !dest_align || TREE_INT_CST_HIGH (len)
1993 || !can_store_by_pieces (TREE_INT_CST_LOW (len),
1994 builtin_strncpy_read_str,
1995 (PTR) p, dest_align))
1998 dest_mem = get_memory_rtx (dest);
1999 store_by_pieces (dest_mem, TREE_INT_CST_LOW (len),
2000 builtin_strncpy_read_str,
2001 (PTR) p, dest_align);
2002 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
2005 /* OK transform into builtin memcpy. */
2006 return expand_builtin_memcpy (arglist);
2010 /* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
2011 bytes from constant string DATA + OFFSET and return it as target
2015 builtin_memset_read_str (data, offset, mode)
2017 HOST_WIDE_INT offset ATTRIBUTE_UNUSED;
2018 enum machine_mode mode;
2020 const char *c = (const char *) data;
2021 char *p = alloca (GET_MODE_SIZE (mode));
2023 memset (p, *c, GET_MODE_SIZE (mode));
2025 return c_readstr (p, mode);
2028 /* Expand expression EXP, which is a call to the memset builtin. Return 0
2029 if we failed the caller should emit a normal call. */
2032 expand_builtin_memset (exp)
2035 tree arglist = TREE_OPERAND (exp, 1);
2037 if (!validate_arglist (arglist,
2038 POINTER_TYPE, INTEGER_TYPE, INTEGER_TYPE, VOID_TYPE))
2042 tree dest = TREE_VALUE (arglist);
2043 tree val = TREE_VALUE (TREE_CHAIN (arglist));
2044 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2047 int dest_align = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
2048 rtx dest_mem, dest_addr, len_rtx;
2050 /* If DEST is not a pointer type, don't do this
2051 operation in-line. */
2052 if (dest_align == 0)
2055 if (TREE_CODE (val) != INTEGER_CST)
2058 if (target_char_cast (val, &c))
2063 if (TREE_CODE (len) != INTEGER_CST || TREE_INT_CST_HIGH (len))
2065 if (current_function_check_memory_usage
2066 || !can_store_by_pieces (TREE_INT_CST_LOW (len),
2067 builtin_memset_read_str,
2068 (PTR) &c, dest_align))
2071 dest_mem = get_memory_rtx (dest);
2072 store_by_pieces (dest_mem, TREE_INT_CST_LOW (len),
2073 builtin_memset_read_str,
2074 (PTR) &c, dest_align);
2075 return force_operand (XEXP (dest_mem, 0), NULL_RTX);
2078 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
2080 dest_mem = get_memory_rtx (dest);
2082 /* Just check DST is writable and mark it as readable. */
2083 if (current_function_check_memory_usage)
2084 emit_library_call (chkr_check_addr_libfunc, LCT_CONST_MAKE_BLOCK,
2085 VOIDmode, 3, XEXP (dest_mem, 0), Pmode,
2086 len_rtx, TYPE_MODE (sizetype),
2087 GEN_INT (MEMORY_USE_WO),
2088 TYPE_MODE (integer_type_node));
2091 dest_addr = clear_storage (dest_mem, len_rtx, dest_align);
2094 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
2100 /* Expand expression EXP, which is a call to the bzero builtin. Return 0
2101 if we failed the caller should emit a normal call. */
2103 expand_builtin_bzero (exp)
2106 tree arglist = TREE_OPERAND (exp, 1);
2107 tree dest, size, newarglist;
2110 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2113 dest = TREE_VALUE (arglist);
2114 size = TREE_VALUE (TREE_CHAIN (arglist));
2116 /* New argument list transforming bzero(ptr x, int y) to
2117 memset(ptr x, int 0, size_t y). */
2119 newarglist = build_tree_list (NULL_TREE, convert (sizetype, size));
2120 newarglist = tree_cons (NULL_TREE, integer_zero_node, newarglist);
2121 newarglist = tree_cons (NULL_TREE, dest, newarglist);
2123 TREE_OPERAND (exp, 1) = newarglist;
2124 result = expand_builtin_memset(exp);
2126 /* Always restore the original arguments. */
2127 TREE_OPERAND (exp, 1) = arglist;
2132 #ifdef HAVE_cmpstrsi
2133 /* Expand expression EXP, which is a call to the memcmp or the strcmp builtin.
2134 ARGLIST is the argument list for this call. Return 0 if we failed and the
2135 caller should emit a normal call, otherwise try to get the result in
2136 TARGET, if convenient. */
2138 expand_builtin_memcmp (exp, arglist, target)
2143 /* If we need to check memory accesses, call the library function. */
2144 if (current_function_check_memory_usage)
2147 if (!validate_arglist (arglist,
2148 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2152 enum machine_mode mode;
2153 tree arg1 = TREE_VALUE (arglist);
2154 tree arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2155 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2156 rtx arg1_rtx, arg2_rtx, arg3_rtx;
2161 = get_pointer_alignment (arg1, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
2163 = get_pointer_alignment (arg2, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
2164 enum machine_mode insn_mode
2165 = insn_data[(int) CODE_FOR_cmpstrsi].operand[0].mode;
2167 /* If we don't have POINTER_TYPE, call the function. */
2168 if (arg1_align == 0 || arg2_align == 0)
2171 /* Make a place to write the result of the instruction. */
2174 && GET_CODE (result) == REG && GET_MODE (result) == insn_mode
2175 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
2176 result = gen_reg_rtx (insn_mode);
2178 arg1_rtx = get_memory_rtx (arg1);
2179 arg2_rtx = get_memory_rtx (arg2);
2180 arg3_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
2184 insn = gen_cmpstrsi (result, arg1_rtx, arg2_rtx, arg3_rtx,
2185 GEN_INT (MIN (arg1_align, arg2_align)));
2190 emit_library_call_value (memcmp_libfunc, result, LCT_PURE_MAKE_BLOCK,
2191 TYPE_MODE (integer_type_node), 3,
2192 XEXP (arg1_rtx, 0), Pmode,
2193 XEXP (arg2_rtx, 0), Pmode,
2194 convert_to_mode (TYPE_MODE (sizetype), arg3_rtx,
2195 TREE_UNSIGNED (sizetype)),
2196 TYPE_MODE (sizetype));
2198 /* Return the value in the proper mode for this function. */
2199 mode = TYPE_MODE (TREE_TYPE (exp));
2200 if (GET_MODE (result) == mode)
2202 else if (target != 0)
2204 convert_move (target, result, 0);
2208 return convert_to_mode (mode, result, 0);
2213 /* Expand expression EXP, which is a call to the strcmp builtin. Return 0
2214 if we failed the caller should emit a normal call, otherwise try to get
2215 the result in TARGET, if convenient. */
2218 expand_builtin_strcmp (exp, target, mode)
2221 enum machine_mode mode;
2223 tree arglist = TREE_OPERAND (exp, 1);
2225 const char *p1, *p2;
2227 /* If we need to check memory accesses, call the library function. */
2228 if (current_function_check_memory_usage)
2231 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2234 arg1 = TREE_VALUE (arglist);
2235 arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2237 p1 = c_getstr (arg1);
2238 p2 = c_getstr (arg2);
2242 const int i = strcmp (p1, p2);
2243 return (i < 0 ? constm1_rtx : (i > 0 ? const1_rtx : const0_rtx));
2246 /* If either arg is "", return an expression corresponding to
2247 (*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
2248 if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
2250 tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
2251 tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
2253 fold (build1 (CONVERT_EXPR, integer_type_node,
2254 build1 (INDIRECT_REF, cst_uchar_node,
2255 build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
2257 fold (build1 (CONVERT_EXPR, integer_type_node,
2258 build1 (INDIRECT_REF, cst_uchar_node,
2259 build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
2260 tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
2261 return expand_expr (result, target, mode, EXPAND_NORMAL);
2264 #ifdef HAVE_cmpstrsi
2265 if (! HAVE_cmpstrsi)
2269 tree len = c_strlen (arg1);
2270 tree len2 = c_strlen (arg2);
2274 len = size_binop (PLUS_EXPR, ssize_int (1), len);
2277 len2 = size_binop (PLUS_EXPR, ssize_int (1), len2);
2279 /* If we don't have a constant length for the first, use the length
2280 of the second, if we know it. We don't require a constant for
2281 this case; some cost analysis could be done if both are available
2282 but neither is constant. For now, assume they're equally cheap
2283 unless one has side effects.
2285 If both strings have constant lengths, use the smaller. This
2286 could arise if optimization results in strcpy being called with
2287 two fixed strings, or if the code was machine-generated. We should
2288 add some code to the `memcmp' handler below to deal with such
2289 situations, someday. */
2291 if (!len || TREE_CODE (len) != INTEGER_CST)
2293 if (len2 && !TREE_SIDE_EFFECTS (len2))
2298 else if (len2 && TREE_CODE (len2) == INTEGER_CST
2299 && tree_int_cst_lt (len2, len))
2302 /* If both arguments have side effects, we cannot optimize. */
2303 if (TREE_SIDE_EFFECTS (len))
2306 chainon (arglist, build_tree_list (NULL_TREE, len));
2307 result = expand_builtin_memcmp (exp, arglist, target);
2309 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
2318 /* Expand expression EXP, which is a call to the strncmp builtin. Return 0
2319 if we failed the caller should emit a normal call, otherwise try to get
2320 the result in TARGET, if convenient. */
2322 expand_builtin_strncmp (exp, target, mode)
2325 enum machine_mode mode;
2327 tree arglist = TREE_OPERAND (exp, 1);
2328 tree arg1, arg2, arg3;
2329 const char *p1, *p2;
2331 /* If we need to check memory accesses, call the library function. */
2332 if (current_function_check_memory_usage)
2335 if (!validate_arglist (arglist,
2336 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2339 arg1 = TREE_VALUE (arglist);
2340 arg2 = TREE_VALUE (TREE_CHAIN (arglist));
2341 arg3 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2343 /* If the len parameter is zero, return zero. */
2344 if (host_integerp (arg3, 1) && tree_low_cst (arg3, 1) == 0)
2346 /* Evaluate and ignore arg1 and arg2 in case they have
2348 expand_expr (arg1, const0_rtx, VOIDmode, EXPAND_NORMAL);
2349 expand_expr (arg2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2353 p1 = c_getstr (arg1);
2354 p2 = c_getstr (arg2);
2356 /* If all arguments are constant, evaluate at compile-time. */
2357 if (host_integerp (arg3, 1) && p1 && p2)
2359 const int r = strncmp (p1, p2, tree_low_cst (arg3, 1));
2360 return (r < 0 ? constm1_rtx : (r > 0 ? const1_rtx : const0_rtx));
2363 /* If len == 1 or (either string parameter is "" and (len >= 1)),
2364 return (*(const u_char*)arg1 - *(const u_char*)arg2). */
2365 if (host_integerp (arg3, 1)
2366 && (tree_low_cst (arg3, 1) == 1
2367 || (tree_low_cst (arg3, 1) > 1
2368 && ((p1 && *p1 == '\0') || (p2 && *p2 == '\0')))))
2370 tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
2371 tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
2373 fold (build1 (CONVERT_EXPR, integer_type_node,
2374 build1 (INDIRECT_REF, cst_uchar_node,
2375 build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
2377 fold (build1 (CONVERT_EXPR, integer_type_node,
2378 build1 (INDIRECT_REF, cst_uchar_node,
2379 build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
2380 tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
2381 return expand_expr (result, target, mode, EXPAND_NORMAL);
2384 #ifdef HAVE_cmpstrsi
2385 /* If c_strlen can determine an expression for one of the string
2386 lengths, and it doesn't have side effects, then call
2387 expand_builtin_memcmp() using length MIN(strlen(string)+1, arg3). */
2390 tree newarglist, len = 0;
2392 /* Perhaps one of the strings is really constant, if so prefer
2393 that constant length over the other string's length. */
2395 len = c_strlen (arg1);
2397 len = c_strlen (arg2);
2399 /* If we still don't have a len, try either string arg as long
2400 as they don't have side effects. */
2401 if (!len && !TREE_SIDE_EFFECTS (arg1))
2402 len = c_strlen (arg1);
2403 if (!len && !TREE_SIDE_EFFECTS (arg2))
2404 len = c_strlen (arg2);
2405 /* If we still don't have a length, punt. */
2409 /* Add one to the string length. */
2410 len = fold (size_binop (PLUS_EXPR, len, ssize_int (1)));
2412 /* The actual new length parameter is MIN(len,arg3). */
2413 len = fold (build (MIN_EXPR, TREE_TYPE (len), len, arg3));
2415 newarglist = build_tree_list (NULL_TREE, len);
2416 newarglist = tree_cons (NULL_TREE, arg2, newarglist);
2417 newarglist = tree_cons (NULL_TREE, arg1, newarglist);
2418 return expand_builtin_memcmp (exp, newarglist, target);
2425 /* Expand expression EXP, which is a call to the strcat builtin.
2426 Return 0 if we failed the caller should emit a normal call,
2427 otherwise try to get the result in TARGET, if convenient. */
2429 expand_builtin_strcat (arglist, target, mode)
2432 enum machine_mode mode;
2434 /* If we need to check memory accesses, call the library function. */
2435 if (current_function_check_memory_usage)
2438 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2442 tree dst = TREE_VALUE (arglist),
2443 src = TREE_VALUE (TREE_CHAIN (arglist));
2444 const char *p = c_getstr (src);
2446 /* If the string length is zero, return the dst parameter. */
2447 if (p && *p == '\0')
2448 return expand_expr (dst, target, mode, EXPAND_NORMAL);
2454 /* Expand expression EXP, which is a call to the strncat builtin.
2455 Return 0 if we failed the caller should emit a normal call,
2456 otherwise try to get the result in TARGET, if convenient. */
2458 expand_builtin_strncat (arglist, target, mode)
2461 enum machine_mode mode;
2463 /* If we need to check memory accesses, call the library function. */
2464 if (current_function_check_memory_usage)
2467 if (!validate_arglist (arglist,
2468 POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
2472 tree dst = TREE_VALUE (arglist),
2473 src = TREE_VALUE (TREE_CHAIN (arglist)),
2474 len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
2475 const char *p = c_getstr (src);
2477 /* If the requested length is zero, or the src parameter string
2478 length is zero, return the dst parameter. */
2479 if ((TREE_CODE (len) == INTEGER_CST && compare_tree_int (len, 0) == 0)
2480 || (p && *p == '\0'))
2482 /* Evaluate and ignore the src and len parameters in case
2483 they have side-effects. */
2484 expand_expr (src, const0_rtx, VOIDmode, EXPAND_NORMAL);
2485 expand_expr (len, const0_rtx, VOIDmode, EXPAND_NORMAL);
2486 return expand_expr (dst, target, mode, EXPAND_NORMAL);
2489 /* If the requested len is greater than or equal to the string
2490 length, call strcat. */
2491 if (TREE_CODE (len) == INTEGER_CST && p
2492 && compare_tree_int (len, strlen (p)) >= 0)
2495 tree_cons (NULL_TREE, dst, build_tree_list (NULL_TREE, src)),
2496 fn = built_in_decls[BUILT_IN_STRCAT];
2498 /* If the replacement _DECL isn't initialized, don't do the
2503 return expand_expr (build_function_call_expr (fn, newarglist),
2504 target, mode, EXPAND_NORMAL);
2510 /* Expand expression EXP, which is a call to the strspn builtin.
2511 Return 0 if we failed the caller should emit a normal call,
2512 otherwise try to get the result in TARGET, if convenient. */
2514 expand_builtin_strspn (arglist, target, mode)
2517 enum machine_mode mode;
2519 /* If we need to check memory accesses, call the library function. */
2520 if (current_function_check_memory_usage)
2523 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2527 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
2528 const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
2530 /* If both arguments are constants, evaluate at compile-time. */
2533 const size_t r = strspn (p1, p2);
2534 return expand_expr (size_int (r), target, mode, EXPAND_NORMAL);
2537 /* If either argument is "", return 0. */
2538 if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
2540 /* Evaluate and ignore both arguments in case either one has
2542 expand_expr (s1, const0_rtx, VOIDmode, EXPAND_NORMAL);
2543 expand_expr (s2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2550 /* Expand expression EXP, which is a call to the strcspn builtin.
2551 Return 0 if we failed the caller should emit a normal call,
2552 otherwise try to get the result in TARGET, if convenient. */
2554 expand_builtin_strcspn (arglist, target, mode)
2557 enum machine_mode mode;
2559 /* If we need to check memory accesses, call the library function. */
2560 if (current_function_check_memory_usage)
2563 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
2567 tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
2568 const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
2570 /* If both arguments are constants, evaluate at compile-time. */
2573 const size_t r = strcspn (p1, p2);
2574 return expand_expr (size_int (r), target, mode, EXPAND_NORMAL);
2577 /* If the first argument is "", return 0. */
2578 if (p1 && *p1 == '\0')
2580 /* Evaluate and ignore argument s2 in case it has
2582 expand_expr (s2, const0_rtx, VOIDmode, EXPAND_NORMAL);
2586 /* If the second argument is "", return __builtin_strlen(s1). */
2587 if (p2 && *p2 == '\0')
2589 tree newarglist = build_tree_list (NULL_TREE, s1),
2590 fn = built_in_decls[BUILT_IN_STRLEN];
2592 /* If the replacement _DECL isn't initialized, don't do the
2597 return expand_expr (build_function_call_expr (fn, newarglist),
2598 target, mode, EXPAND_NORMAL);
2604 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
2605 if that's convenient. */
2608 expand_builtin_saveregs ()
2612 /* Don't do __builtin_saveregs more than once in a function.
2613 Save the result of the first call and reuse it. */
2614 if (saveregs_value != 0)
2615 return saveregs_value;
2617 /* When this function is called, it means that registers must be
2618 saved on entry to this function. So we migrate the call to the
2619 first insn of this function. */
2623 #ifdef EXPAND_BUILTIN_SAVEREGS
2624 /* Do whatever the machine needs done in this case. */
2625 val = EXPAND_BUILTIN_SAVEREGS ();
2627 /* ??? We used to try and build up a call to the out of line function,
2628 guessing about what registers needed saving etc. This became much
2629 harder with __builtin_va_start, since we don't have a tree for a
2630 call to __builtin_saveregs to fall back on. There was exactly one
2631 port (i860) that used this code, and I'm unconvinced it could actually
2632 handle the general case. So we no longer try to handle anything
2633 weird and make the backend absorb the evil. */
2635 error ("__builtin_saveregs not supported by this target");
2642 saveregs_value = val;
2644 /* Put the sequence after the NOTE that starts the function. If this
2645 is inside a SEQUENCE, make the outer-level insn chain current, so
2646 the code is placed at the start of the function. */
2647 push_topmost_sequence ();
2648 emit_insns_after (seq, get_insns ());
2649 pop_topmost_sequence ();
2654 /* __builtin_args_info (N) returns word N of the arg space info
2655 for the current function. The number and meanings of words
2656 is controlled by the definition of CUMULATIVE_ARGS. */
2659 expand_builtin_args_info (exp)
2662 tree arglist = TREE_OPERAND (exp, 1);
2663 int nwords = sizeof (CUMULATIVE_ARGS) / sizeof (int);
2664 int *word_ptr = (int *) ¤t_function_args_info;
2666 /* These are used by the code below that is if 0'ed away */
2668 tree type, elts, result;
2671 if (sizeof (CUMULATIVE_ARGS) % sizeof (int) != 0)
2676 tree arg = TREE_VALUE (arglist);
2677 if (TREE_CODE (arg) != INTEGER_CST)
2678 error ("argument of `__builtin_args_info' must be constant");
2681 int wordnum = TREE_INT_CST_LOW (arg);
2683 if (wordnum < 0 || wordnum >= nwords || TREE_INT_CST_HIGH (arg))
2684 error ("argument of `__builtin_args_info' out of range");
2686 return GEN_INT (word_ptr[wordnum]);
2690 error ("missing argument in `__builtin_args_info'");
2695 for (i = 0; i < nwords; i++)
2696 elts = tree_cons (NULL_TREE, build_int_2 (word_ptr[i], 0));
2698 type = build_array_type (integer_type_node,
2699 build_index_type (build_int_2 (nwords, 0)));
2700 result = build (CONSTRUCTOR, type, NULL_TREE, nreverse (elts));
2701 TREE_CONSTANT (result) = 1;
2702 TREE_STATIC (result) = 1;
2703 result = build1 (INDIRECT_REF, build_pointer_type (type), result);
2704 TREE_CONSTANT (result) = 1;
2705 return expand_expr (result, NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD);
2709 /* Expand ARGLIST, from a call to __builtin_next_arg. */
2711 expand_builtin_next_arg (arglist)
2714 tree fntype = TREE_TYPE (current_function_decl);
2716 if ((TYPE_ARG_TYPES (fntype) == 0
2717 || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype)))
2719 && ! current_function_varargs)
2721 error ("`va_start' used in function with fixed args");
2727 tree last_parm = tree_last (DECL_ARGUMENTS (current_function_decl));
2728 tree arg = TREE_VALUE (arglist);
2730 /* Strip off all nops for the sake of the comparison. This
2731 is not quite the same as STRIP_NOPS. It does more.
2732 We must also strip off INDIRECT_EXPR for C++ reference
2734 while (TREE_CODE (arg) == NOP_EXPR
2735 || TREE_CODE (arg) == CONVERT_EXPR
2736 || TREE_CODE (arg) == NON_LVALUE_EXPR
2737 || TREE_CODE (arg) == INDIRECT_REF)
2738 arg = TREE_OPERAND (arg, 0);
2739 if (arg != last_parm)
2740 warning ("second parameter of `va_start' not last named argument");
2742 else if (! current_function_varargs)
2743 /* Evidently an out of date version of <stdarg.h>; can't validate
2744 va_start's second argument, but can still work as intended. */
2745 warning ("`__builtin_next_arg' called without an argument");
2747 return expand_binop (Pmode, add_optab,
2748 current_function_internal_arg_pointer,
2749 current_function_arg_offset_rtx,
2750 NULL_RTX, 0, OPTAB_LIB_WIDEN);
2753 /* Make it easier for the backends by protecting the valist argument
2754 from multiple evaluations. */
2757 stabilize_va_list (valist, needs_lvalue)
2761 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
2763 if (TREE_SIDE_EFFECTS (valist))
2764 valist = save_expr (valist);
2766 /* For this case, the backends will be expecting a pointer to
2767 TREE_TYPE (va_list_type_node), but it's possible we've
2768 actually been given an array (an actual va_list_type_node).
2770 if (TREE_CODE (TREE_TYPE (valist)) == ARRAY_TYPE)
2772 tree p1 = build_pointer_type (TREE_TYPE (va_list_type_node));
2773 tree p2 = build_pointer_type (va_list_type_node);
2775 valist = build1 (ADDR_EXPR, p2, valist);
2776 valist = fold (build1 (NOP_EXPR, p1, valist));
2785 if (! TREE_SIDE_EFFECTS (valist))
2788 pt = build_pointer_type (va_list_type_node);
2789 valist = fold (build1 (ADDR_EXPR, pt, valist));
2790 TREE_SIDE_EFFECTS (valist) = 1;
2793 if (TREE_SIDE_EFFECTS (valist))
2794 valist = save_expr (valist);
2795 valist = fold (build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (valist)),
2802 /* The "standard" implementation of va_start: just assign `nextarg' to
2805 std_expand_builtin_va_start (stdarg_p, valist, nextarg)
2814 /* The dummy named parameter is declared as a 'word' sized
2815 object, but if a 'word' is smaller than an 'int', it would
2816 have been promoted to int when it was added to the arglist. */
2817 int align = PARM_BOUNDARY / BITS_PER_UNIT;
2818 int size = MAX (UNITS_PER_WORD,
2819 GET_MODE_SIZE (TYPE_MODE (integer_type_node)));
2820 int offset = ((size + align - 1) / align) * align;
2821 nextarg = plus_constant (nextarg, -offset);
2824 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
2825 make_tree (ptr_type_node, nextarg));
2826 TREE_SIDE_EFFECTS (t) = 1;
2828 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2831 /* Expand ARGLIST, which from a call to __builtin_stdarg_va_start or
2832 __builtin_varargs_va_start, depending on STDARG_P. */
2834 expand_builtin_va_start (stdarg_p, arglist)
2839 tree chain = arglist, valist;
2842 nextarg = expand_builtin_next_arg (chain = TREE_CHAIN (arglist));
2844 nextarg = expand_builtin_next_arg (NULL_TREE);
2846 if (TREE_CHAIN (chain))
2847 error ("too many arguments to function `va_start'");
2849 valist = stabilize_va_list (TREE_VALUE (arglist), 1);
2851 #ifdef EXPAND_BUILTIN_VA_START
2852 EXPAND_BUILTIN_VA_START (stdarg_p, valist, nextarg);
2854 std_expand_builtin_va_start (stdarg_p, valist, nextarg);
2860 /* The "standard" implementation of va_arg: read the value from the
2861 current (padded) address and increment by the (padded) size. */
2864 std_expand_builtin_va_arg (valist, type)
2868 HOST_WIDE_INT align;
2869 HOST_WIDE_INT rounded_size;
2872 /* Compute the rounded size of the type. */
2873 align = PARM_BOUNDARY / BITS_PER_UNIT;
2874 rounded_size = (((int_size_in_bytes (type) + align - 1) / align) * align);
2878 if (PAD_VARARGS_DOWN)
2880 /* Small args are padded downward. */
2883 adj = TREE_INT_CST_LOW (TYPE_SIZE (type)) / BITS_PER_UNIT;
2884 if (rounded_size > align)
2887 addr_tree = build (PLUS_EXPR, TREE_TYPE (addr_tree), addr_tree,
2888 build_int_2 (rounded_size - adj, 0));
2891 addr = expand_expr (addr_tree, NULL_RTX, Pmode, EXPAND_NORMAL);
2892 addr = copy_to_reg (addr);
2894 /* Compute new value for AP. */
2895 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
2896 build (PLUS_EXPR, TREE_TYPE (valist), valist,
2897 build_int_2 (rounded_size, 0)));
2898 TREE_SIDE_EFFECTS (t) = 1;
2899 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2904 /* Expand __builtin_va_arg, which is not really a builtin function, but
2905 a very special sort of operator. */
2908 expand_builtin_va_arg (valist, type)
2912 tree promoted_type, want_va_type, have_va_type;
2914 /* Verify that valist is of the proper type. */
2916 want_va_type = va_list_type_node;
2917 have_va_type = TREE_TYPE (valist);
2918 if (TREE_CODE (want_va_type) == ARRAY_TYPE)
2920 /* If va_list is an array type, the argument may have decayed
2921 to a pointer type, e.g. by being passed to another function.
2922 In that case, unwrap both types so that we can compare the
2923 underlying records. */
2924 if (TREE_CODE (have_va_type) == ARRAY_TYPE
2925 || TREE_CODE (have_va_type) == POINTER_TYPE)
2927 want_va_type = TREE_TYPE (want_va_type);
2928 have_va_type = TREE_TYPE (have_va_type);
2931 if (TYPE_MAIN_VARIANT (want_va_type) != TYPE_MAIN_VARIANT (have_va_type))
2933 error ("first argument to `va_arg' not of type `va_list'");
2937 /* Generate a diagnostic for requesting data of a type that cannot
2938 be passed through `...' due to type promotion at the call site. */
2939 else if ((promoted_type = (*lang_type_promotes_to) (type)) != NULL_TREE)
2941 const char *name = "<anonymous type>", *pname = 0;
2942 static int gave_help;
2944 if (TYPE_NAME (type))
2946 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
2947 name = IDENTIFIER_POINTER (TYPE_NAME (type));
2948 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
2949 && DECL_NAME (TYPE_NAME (type)))
2950 name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
2952 if (TYPE_NAME (promoted_type))
2954 if (TREE_CODE (TYPE_NAME (promoted_type)) == IDENTIFIER_NODE)
2955 pname = IDENTIFIER_POINTER (TYPE_NAME (promoted_type));
2956 else if (TREE_CODE (TYPE_NAME (promoted_type)) == TYPE_DECL
2957 && DECL_NAME (TYPE_NAME (promoted_type)))
2958 pname = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (promoted_type)));
2961 error ("`%s' is promoted to `%s' when passed through `...'", name, pname);
2965 error ("(so you should pass `%s' not `%s' to `va_arg')", pname, name);
2972 /* Make it easier for the backends by protecting the valist argument
2973 from multiple evaluations. */
2974 valist = stabilize_va_list (valist, 0);
2976 #ifdef EXPAND_BUILTIN_VA_ARG
2977 addr = EXPAND_BUILTIN_VA_ARG (valist, type);
2979 addr = std_expand_builtin_va_arg (valist, type);
2983 result = gen_rtx_MEM (TYPE_MODE (type), addr);
2984 MEM_ALIAS_SET (result) = get_varargs_alias_set ();
2989 /* Expand ARGLIST, from a call to __builtin_va_end. */
2992 expand_builtin_va_end (arglist)
2995 tree valist = TREE_VALUE (arglist);
2997 #ifdef EXPAND_BUILTIN_VA_END
2998 valist = stabilize_va_list (valist, 0);
2999 EXPAND_BUILTIN_VA_END(arglist);
3001 /* Evaluate for side effects, if needed. I hate macros that don't
3003 if (TREE_SIDE_EFFECTS (valist))
3004 expand_expr (valist, const0_rtx, VOIDmode, EXPAND_NORMAL);
3010 /* Expand ARGLIST, from a call to __builtin_va_copy. We do this as a
3011 builtin rather than just as an assignment in stdarg.h because of the
3012 nastiness of array-type va_list types. */
3015 expand_builtin_va_copy (arglist)
3020 dst = TREE_VALUE (arglist);
3021 src = TREE_VALUE (TREE_CHAIN (arglist));
3023 dst = stabilize_va_list (dst, 1);
3024 src = stabilize_va_list (src, 0);
3026 if (TREE_CODE (va_list_type_node) != ARRAY_TYPE)
3028 t = build (MODIFY_EXPR, va_list_type_node, dst, src);
3029 TREE_SIDE_EFFECTS (t) = 1;
3030 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
3034 rtx dstb, srcb, size;
3036 /* Evaluate to pointers. */
3037 dstb = expand_expr (dst, NULL_RTX, Pmode, EXPAND_NORMAL);
3038 srcb = expand_expr (src, NULL_RTX, Pmode, EXPAND_NORMAL);
3039 size = expand_expr (TYPE_SIZE_UNIT (va_list_type_node), NULL_RTX,
3040 VOIDmode, EXPAND_NORMAL);
3042 /* "Dereference" to BLKmode memories. */
3043 dstb = gen_rtx_MEM (BLKmode, dstb);
3044 MEM_ALIAS_SET (dstb) = get_alias_set (TREE_TYPE (TREE_TYPE (dst)));
3045 srcb = gen_rtx_MEM (BLKmode, srcb);
3046 MEM_ALIAS_SET (srcb) = get_alias_set (TREE_TYPE (TREE_TYPE (src)));
3049 emit_block_move (dstb, srcb, size, TYPE_ALIGN (va_list_type_node));
3055 /* Expand a call to one of the builtin functions __builtin_frame_address or
3056 __builtin_return_address. */
3058 expand_builtin_frame_address (exp)
3061 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3062 tree arglist = TREE_OPERAND (exp, 1);
3064 /* The argument must be a nonnegative integer constant.
3065 It counts the number of frames to scan up the stack.
3066 The value is the return address saved in that frame. */
3068 /* Warning about missing arg was already issued. */
3070 else if (TREE_CODE (TREE_VALUE (arglist)) != INTEGER_CST
3071 || tree_int_cst_sgn (TREE_VALUE (arglist)) < 0)
3073 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3074 error ("invalid arg to `__builtin_frame_address'");
3076 error ("invalid arg to `__builtin_return_address'");
3081 rtx tem = expand_builtin_return_addr (DECL_FUNCTION_CODE (fndecl),
3082 TREE_INT_CST_LOW (TREE_VALUE (arglist)),
3083 hard_frame_pointer_rtx);
3085 /* Some ports cannot access arbitrary stack frames. */
3088 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3089 warning ("unsupported arg to `__builtin_frame_address'");
3091 warning ("unsupported arg to `__builtin_return_address'");
3095 /* For __builtin_frame_address, return what we've got. */
3096 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
3099 if (GET_CODE (tem) != REG
3100 && ! CONSTANT_P (tem))
3101 tem = copy_to_mode_reg (Pmode, tem);
3106 /* Expand a call to the alloca builtin, with arguments ARGLIST. Return 0 if
3107 we failed and the caller should emit a normal call, otherwise try to get
3108 the result in TARGET, if convenient. */
3111 expand_builtin_alloca (arglist, target)
3118 if (!validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
3121 /* Compute the argument. */
3122 op0 = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
3124 /* Allocate the desired space. */
3125 result = allocate_dynamic_stack_space (op0, target, BITS_PER_UNIT);
3127 #ifdef POINTERS_EXTEND_UNSIGNED
3128 result = convert_memory_address (ptr_mode, result);
3134 /* Expand a call to the ffs builtin. The arguments are in ARGLIST.
3135 Return 0 if a normal call should be emitted rather than expanding the
3136 function in-line. If convenient, the result should be placed in TARGET.
3137 SUBTARGET may be used as the target for computing one of EXP's operands. */
3140 expand_builtin_ffs (arglist, target, subtarget)
3142 rtx target, subtarget;
3145 if (!validate_arglist (arglist, INTEGER_TYPE, VOID_TYPE))
3148 /* Compute the argument. */
3149 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
3150 /* Compute ffs, into TARGET if possible.
3151 Set TARGET to wherever the result comes back. */
3152 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
3153 ffs_optab, op0, target, 1);
3159 /* If the string passed to fputs is a constant and is one character
3160 long, we attempt to transform this call into __builtin_fputc(). */
3163 expand_builtin_fputs (arglist, ignore)
3167 tree len, fn, fn_fputc = built_in_decls[BUILT_IN_FPUTC],
3168 fn_fwrite = built_in_decls[BUILT_IN_FWRITE];
3170 /* If the return value is used, or the replacement _DECL isn't
3171 initialized, don't do the transformation. */
3172 if (!ignore || !fn_fputc || !fn_fwrite)
3175 /* Verify the arguments in the original call. */
3176 if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE)
3177 || current_function_check_memory_usage)
3180 /* Get the length of the string passed to fputs. If the length
3181 can't be determined, punt. */
3182 if (!(len = c_strlen (TREE_VALUE (arglist)))
3183 || TREE_CODE (len) != INTEGER_CST)
3186 switch (compare_tree_int (len, 1))
3188 case -1: /* length is 0, delete the call entirely . */
3190 /* Evaluate and ignore the argument in case it has
3192 expand_expr (TREE_VALUE (TREE_CHAIN (arglist)), const0_rtx,
3193 VOIDmode, EXPAND_NORMAL);
3196 case 0: /* length is 1, call fputc. */
3198 const char *p = c_getstr (TREE_VALUE (arglist));
3202 /* New argument list transforming fputs(string, stream) to
3203 fputc(string[0], stream). */
3205 build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)));
3207 tree_cons (NULL_TREE, build_int_2 (p[0], 0), arglist);
3213 case 1: /* length is greater than 1, call fwrite. */
3215 tree string_arg = TREE_VALUE (arglist);
3217 /* New argument list transforming fputs(string, stream) to
3218 fwrite(string, 1, len, stream). */
3219 arglist = build_tree_list (NULL_TREE, TREE_VALUE (TREE_CHAIN (arglist)));
3220 arglist = tree_cons (NULL_TREE, len, arglist);
3221 arglist = tree_cons (NULL_TREE, size_one_node, arglist);
3222 arglist = tree_cons (NULL_TREE, string_arg, arglist);
3230 return expand_expr (build_function_call_expr (fn, arglist),
3231 (ignore ? const0_rtx : NULL_RTX),
3232 VOIDmode, EXPAND_NORMAL);
3235 /* Expand a call to __builtin_expect. We return our argument and
3236 emit a NOTE_INSN_EXPECTED_VALUE note. */
3239 expand_builtin_expect (arglist, target)
3246 if (arglist == NULL_TREE
3247 || TREE_CHAIN (arglist) == NULL_TREE)
3249 exp = TREE_VALUE (arglist);
3250 c = TREE_VALUE (TREE_CHAIN (arglist));
3252 if (TREE_CODE (c) != INTEGER_CST)
3254 error ("second arg to `__builtin_expect' must be a constant");
3255 c = integer_zero_node;
3258 target = expand_expr (exp, target, VOIDmode, EXPAND_NORMAL);
3260 /* Don't bother with expected value notes for integral constants. */
3261 if (GET_CODE (target) != CONST_INT)
3263 /* We do need to force this into a register so that we can be
3264 moderately sure to be able to correctly interpret the branch
3266 target = force_reg (GET_MODE (target), target);
3268 rtx_c = expand_expr (c, NULL_RTX, GET_MODE (target), EXPAND_NORMAL);
3270 note = emit_note (NULL, NOTE_INSN_EXPECTED_VALUE);
3271 NOTE_EXPECTED_VALUE (note) = gen_rtx_EQ (VOIDmode, target, rtx_c);
3277 /* Expand an expression EXP that calls a built-in function,
3278 with result going to TARGET if that's convenient
3279 (and in mode MODE if that's convenient).
3280 SUBTARGET may be used as the target for computing one of EXP's operands.
3281 IGNORE is nonzero if the value is to be ignored. */
3284 expand_builtin (exp, target, subtarget, mode, ignore)
3288 enum machine_mode mode;
3291 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3292 tree arglist = TREE_OPERAND (exp, 1);
3293 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
3295 #ifdef MD_EXPAND_BUILTIN
3296 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
3297 return MD_EXPAND_BUILTIN (exp, target, subtarget, mode, ignore);
3300 /* When not optimizing, generate calls to library functions for a certain
3302 if (! optimize && ! CALLED_AS_BUILT_IN (fndecl)
3303 && (fcode == BUILT_IN_SIN || fcode == BUILT_IN_COS
3304 || fcode == BUILT_IN_FSQRT || fcode == BUILT_IN_SQRTF
3305 || fcode == BUILT_IN_SQRTL || fcode == BUILT_IN_MEMSET
3306 || fcode == BUILT_IN_MEMCPY || fcode == BUILT_IN_MEMCMP
3307 || fcode == BUILT_IN_BCMP || fcode == BUILT_IN_BZERO
3308 || fcode == BUILT_IN_INDEX || fcode == BUILT_IN_RINDEX
3309 || fcode == BUILT_IN_STRCHR || fcode == BUILT_IN_STRRCHR
3310 || fcode == BUILT_IN_STRLEN || fcode == BUILT_IN_STRCPY
3311 || fcode == BUILT_IN_STRNCPY || fcode == BUILT_IN_STRNCMP
3312 || fcode == BUILT_IN_STRSTR || fcode == BUILT_IN_STRPBRK
3313 || fcode == BUILT_IN_STRCAT || fcode == BUILT_IN_STRNCAT
3314 || fcode == BUILT_IN_STRSPN || fcode == BUILT_IN_STRCSPN
3315 || fcode == BUILT_IN_STRCMP || fcode == BUILT_IN_FFS
3316 || fcode == BUILT_IN_PUTCHAR || fcode == BUILT_IN_PUTS
3317 || fcode == BUILT_IN_PRINTF || fcode == BUILT_IN_FPUTC
3318 || fcode == BUILT_IN_FPUTS || fcode == BUILT_IN_FWRITE))
3319 return expand_call (exp, target, ignore);
3325 case BUILT_IN_LLABS:
3326 case BUILT_IN_IMAXABS:
3328 case BUILT_IN_FABSF:
3329 case BUILT_IN_FABSL:
3330 /* build_function_call changes these into ABS_EXPR. */
3334 case BUILT_IN_CONJF:
3335 case BUILT_IN_CONJL:
3336 case BUILT_IN_CREAL:
3337 case BUILT_IN_CREALF:
3338 case BUILT_IN_CREALL:
3339 case BUILT_IN_CIMAG:
3340 case BUILT_IN_CIMAGF:
3341 case BUILT_IN_CIMAGL:
3342 /* expand_tree_builtin changes these into CONJ_EXPR, REALPART_EXPR
3343 and IMAGPART_EXPR. */
3352 /* Treat these like sqrt only if unsafe math optimizations are allowed,
3353 because of possible accuracy problems. */
3354 if (! flag_unsafe_math_optimizations)
3356 case BUILT_IN_FSQRT:
3357 case BUILT_IN_SQRTF:
3358 case BUILT_IN_SQRTL:
3359 target = expand_builtin_mathfn (exp, target, subtarget);
3367 case BUILT_IN_APPLY_ARGS:
3368 return expand_builtin_apply_args ();
3370 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
3371 FUNCTION with a copy of the parameters described by
3372 ARGUMENTS, and ARGSIZE. It returns a block of memory
3373 allocated on the stack into which is stored all the registers
3374 that might possibly be used for returning the result of a
3375 function. ARGUMENTS is the value returned by
3376 __builtin_apply_args. ARGSIZE is the number of bytes of
3377 arguments that must be copied. ??? How should this value be
3378 computed? We'll also need a safe worst case value for varargs
3380 case BUILT_IN_APPLY:
3381 if (!validate_arglist (arglist, POINTER_TYPE,
3382 POINTER_TYPE, INTEGER_TYPE, VOID_TYPE)
3383 && !validate_arglist (arglist, REFERENCE_TYPE,
3384 POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
3392 for (t = arglist, i = 0; t; t = TREE_CHAIN (t), i++)
3393 ops[i] = expand_expr (TREE_VALUE (t), NULL_RTX, VOIDmode, 0);
3395 return expand_builtin_apply (ops[0], ops[1], ops[2]);
3398 /* __builtin_return (RESULT) causes the function to return the
3399 value described by RESULT. RESULT is address of the block of
3400 memory returned by __builtin_apply. */
3401 case BUILT_IN_RETURN:
3402 if (validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
3403 expand_builtin_return (expand_expr (TREE_VALUE (arglist),
3404 NULL_RTX, VOIDmode, 0));
3407 case BUILT_IN_SAVEREGS:
3408 return expand_builtin_saveregs ();
3410 case BUILT_IN_ARGS_INFO:
3411 return expand_builtin_args_info (exp);
3413 /* Return the address of the first anonymous stack arg. */
3414 case BUILT_IN_NEXT_ARG:
3415 return expand_builtin_next_arg (arglist);
3417 case BUILT_IN_CLASSIFY_TYPE:
3418 return expand_builtin_classify_type (arglist);
3420 case BUILT_IN_CONSTANT_P:
3421 return expand_builtin_constant_p (exp);
3423 case BUILT_IN_FRAME_ADDRESS:
3424 case BUILT_IN_RETURN_ADDRESS:
3425 return expand_builtin_frame_address (exp);
3427 /* Returns the address of the area where the structure is returned.
3429 case BUILT_IN_AGGREGATE_INCOMING_ADDRESS:
3431 || ! AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl)))
3432 || GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl))) != MEM)
3435 return XEXP (DECL_RTL (DECL_RESULT (current_function_decl)), 0);
3437 case BUILT_IN_ALLOCA:
3438 target = expand_builtin_alloca (arglist, target);
3444 target = expand_builtin_ffs (arglist, target, subtarget);
3449 case BUILT_IN_STRLEN:
3450 target = expand_builtin_strlen (exp, target);
3455 case BUILT_IN_STRCPY:
3456 target = expand_builtin_strcpy (exp);
3461 case BUILT_IN_STRNCPY:
3462 target = expand_builtin_strncpy (arglist, target, mode);
3467 case BUILT_IN_STRCAT:
3468 target = expand_builtin_strcat (arglist, target, mode);
3473 case BUILT_IN_STRNCAT:
3474 target = expand_builtin_strncat (arglist, target, mode);
3479 case BUILT_IN_STRSPN:
3480 target = expand_builtin_strspn (arglist, target, mode);
3485 case BUILT_IN_STRCSPN:
3486 target = expand_builtin_strcspn (arglist, target, mode);
3491 case BUILT_IN_STRSTR:
3492 target = expand_builtin_strstr (arglist, target, mode);
3497 case BUILT_IN_STRPBRK:
3498 target = expand_builtin_strpbrk (arglist, target, mode);
3503 case BUILT_IN_INDEX:
3504 case BUILT_IN_STRCHR:
3505 target = expand_builtin_strchr (arglist, target, mode);
3510 case BUILT_IN_RINDEX:
3511 case BUILT_IN_STRRCHR:
3512 target = expand_builtin_strrchr (arglist, target, mode);
3517 case BUILT_IN_MEMCPY:
3518 target = expand_builtin_memcpy (arglist);
3523 case BUILT_IN_MEMSET:
3524 target = expand_builtin_memset (exp);
3529 case BUILT_IN_BZERO:
3530 target = expand_builtin_bzero (exp);
3535 case BUILT_IN_STRCMP:
3536 target = expand_builtin_strcmp (exp, target, mode);
3541 case BUILT_IN_STRNCMP:
3542 target = expand_builtin_strncmp (exp, target, mode);
3547 /* These comparison functions need an instruction that returns an actual
3548 index. An ordinary compare that just sets the condition codes
3550 #ifdef HAVE_cmpstrsi
3552 case BUILT_IN_MEMCMP:
3553 target = expand_builtin_memcmp (exp, arglist, target);
3559 case BUILT_IN_MEMCMP:
3563 case BUILT_IN_SETJMP:
3564 target = expand_builtin_setjmp (arglist, target);
3569 /* __builtin_longjmp is passed a pointer to an array of five words.
3570 It's similar to the C library longjmp function but works with
3571 __builtin_setjmp above. */
3572 case BUILT_IN_LONGJMP:
3573 if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
3577 rtx buf_addr = expand_expr (TREE_VALUE (arglist), subtarget,
3579 rtx value = expand_expr (TREE_VALUE (TREE_CHAIN (arglist)),
3580 NULL_RTX, VOIDmode, 0);
3582 if (value != const1_rtx)
3584 error ("__builtin_longjmp second argument must be 1");
3588 expand_builtin_longjmp (buf_addr, value);
3595 emit_insn (gen_trap ());
3598 error ("__builtin_trap not supported by this target");
3602 case BUILT_IN_PUTCHAR:
3604 case BUILT_IN_FPUTC:
3605 case BUILT_IN_FWRITE:
3607 case BUILT_IN_FPUTS:
3608 target = expand_builtin_fputs (arglist, ignore);
3613 /* Various hooks for the DWARF 2 __throw routine. */
3614 case BUILT_IN_UNWIND_INIT:
3615 expand_builtin_unwind_init ();
3617 case BUILT_IN_DWARF_CFA:
3618 return virtual_cfa_rtx;
3619 #ifdef DWARF2_UNWIND_INFO
3620 case BUILT_IN_DWARF_FP_REGNUM:
3621 return expand_builtin_dwarf_fp_regnum ();
3622 case BUILT_IN_INIT_DWARF_REG_SIZES:
3623 expand_builtin_init_dwarf_reg_sizes (TREE_VALUE (arglist));
3626 case BUILT_IN_FROB_RETURN_ADDR:
3627 return expand_builtin_frob_return_addr (TREE_VALUE (arglist));
3628 case BUILT_IN_EXTRACT_RETURN_ADDR:
3629 return expand_builtin_extract_return_addr (TREE_VALUE (arglist));
3630 case BUILT_IN_EH_RETURN:
3631 expand_builtin_eh_return (TREE_VALUE (arglist),
3632 TREE_VALUE (TREE_CHAIN (arglist)));
3634 #ifdef EH_RETURN_DATA_REGNO
3635 case BUILT_IN_EH_RETURN_DATA_REGNO:
3636 return expand_builtin_eh_return_data_regno (arglist);
3638 case BUILT_IN_VARARGS_START:
3639 return expand_builtin_va_start (0, arglist);
3640 case BUILT_IN_STDARG_START:
3641 return expand_builtin_va_start (1, arglist);
3642 case BUILT_IN_VA_END:
3643 return expand_builtin_va_end (arglist);
3644 case BUILT_IN_VA_COPY:
3645 return expand_builtin_va_copy (arglist);
3646 case BUILT_IN_EXPECT:
3647 return expand_builtin_expect (arglist, target);
3649 default: /* just do library call, if unknown builtin */
3650 error ("built-in function `%s' not currently supported",
3651 IDENTIFIER_POINTER (DECL_NAME (fndecl)));
3654 /* The switch statement above can drop through to cause the function
3655 to be called normally. */
3656 return expand_call (exp, target, ignore);
3659 /* Fold a call to __builtin_constant_p, if we know it will evaluate to a
3660 constant. ARGLIST is the argument list of the call. */
3663 fold_builtin_constant_p (arglist)
3669 arglist = TREE_VALUE (arglist);
3671 /* We return 1 for a numeric type that's known to be a constant
3672 value at compile-time or for an aggregate type that's a
3673 literal constant. */
3674 STRIP_NOPS (arglist);
3676 /* If we know this is a constant, emit the constant of one. */
3677 if (TREE_CODE_CLASS (TREE_CODE (arglist)) == 'c'
3678 || (TREE_CODE (arglist) == CONSTRUCTOR
3679 && TREE_CONSTANT (arglist))
3680 || (TREE_CODE (arglist) == ADDR_EXPR
3681 && TREE_CODE (TREE_OPERAND (arglist, 0)) == STRING_CST))
3682 return integer_one_node;
3684 /* If we aren't going to be running CSE or this expression
3685 has side effects, show we don't know it to be a constant.
3686 Likewise if it's a pointer or aggregate type since in those
3687 case we only want literals, since those are only optimized
3688 when generating RTL, not later. */
3689 if (TREE_SIDE_EFFECTS (arglist) || cse_not_expected
3690 || AGGREGATE_TYPE_P (TREE_TYPE (arglist))
3691 || POINTER_TYPE_P (TREE_TYPE (arglist)))
3692 return integer_zero_node;
3697 /* Used by constant folding to eliminate some builtin calls early. EXP is
3698 the CALL_EXPR of a call to a builtin function. */
3704 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
3705 tree arglist = TREE_OPERAND (exp, 1);
3706 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
3708 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
3713 case BUILT_IN_CONSTANT_P:
3714 return fold_builtin_constant_p (arglist);
3716 case BUILT_IN_STRLEN:
3717 if (validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
3719 tree len = c_strlen (TREE_VALUE (arglist));
3733 build_function_call_expr (fn, arglist)
3738 call_expr = build1 (ADDR_EXPR, build_pointer_type (TREE_TYPE (fn)), fn);
3739 call_expr = build (CALL_EXPR, TREE_TYPE (TREE_TYPE (fn)),
3740 call_expr, arglist);
3741 TREE_SIDE_EFFECTS (call_expr) = 1;
3742 return fold (call_expr);
3745 /* This function validates the types of a function call argument list
3746 represented as a tree chain of parameters against a specified list
3747 of tree_codes. If the last specifier is a 0, that represents an
3748 ellipses, otherwise the last specifier must be a VOID_TYPE. */
3750 validate_arglist VPARAMS ((tree arglist, ...))
3752 #ifndef ANSI_PROTOTYPES
3755 enum tree_code code;
3758 VA_START (ap, arglist);
3760 #ifndef ANSI_PROTOTYPES
3761 arglist = va_arg (ap, tree);
3765 code = va_arg (ap, enum tree_code);
3769 /* This signifies an ellipses, any further arguments are all ok. */
3773 /* This signifies an endlink, if no arguments remain, return
3774 true, otherwise return false. */
3776 return arglist == 0;
3778 /* If no parameters remain or the parameter's code does not
3779 match the specified code, return false. Otherwise continue
3780 checking any remaining arguments. */
3781 if (arglist == 0 || code != TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))))
3788 arglist = TREE_CHAIN (arglist);