1 /* Expand builtin functions.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
3 1999, 2000 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
30 #include "hard-reg-set.h"
33 #include "insn-flags.h"
34 #include "insn-codes.h"
35 #include "insn-config.h"
39 #include "typeclass.h"
44 #define CALLED_AS_BUILT_IN(NODE) \
45 (!strncmp (IDENTIFIER_POINTER (DECL_NAME (NODE)), "__builtin_", 10))
47 /* Register mappings for target machines without register windows. */
48 #ifndef INCOMING_REGNO
49 #define INCOMING_REGNO(OUT) (OUT)
51 #ifndef OUTGOING_REGNO
52 #define OUTGOING_REGNO(IN) (IN)
55 #ifndef PAD_VARARGS_DOWN
56 #define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
59 /* Define the names of the builtin function types and codes. */
60 const char *const built_in_class_names[4]
61 = {"NOT_BUILT_IN", "BUILT_IN_FRONTEND", "BUILT_IN_MD", "BUILT_IN_NORMAL"};
63 #define DEF_BUILTIN(x) STRINGIFY(x),
64 const char *const built_in_names[(int) END_BUILTINS] =
66 #include "builtins.def"
70 tree (*lang_type_promotes_to) PARAMS ((tree));
72 static int get_pointer_alignment PARAMS ((tree, unsigned));
73 static tree c_strlen PARAMS ((tree));
74 static rtx get_memory_rtx PARAMS ((tree));
75 static int apply_args_size PARAMS ((void));
76 static int apply_result_size PARAMS ((void));
77 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
78 static rtx result_vector PARAMS ((int, rtx));
80 static rtx expand_builtin_apply_args PARAMS ((void));
81 static rtx expand_builtin_apply_args_1 PARAMS ((void));
82 static rtx expand_builtin_apply PARAMS ((rtx, rtx, rtx));
83 static void expand_builtin_return PARAMS ((rtx));
84 static rtx expand_builtin_classify_type PARAMS ((tree));
85 static rtx expand_builtin_mathfn PARAMS ((tree, rtx, rtx));
86 static rtx expand_builtin_constant_p PARAMS ((tree));
87 static rtx expand_builtin_args_info PARAMS ((tree));
88 static rtx expand_builtin_next_arg PARAMS ((tree));
89 static rtx expand_builtin_va_start PARAMS ((int, tree));
90 static rtx expand_builtin_va_end PARAMS ((tree));
91 static rtx expand_builtin_va_copy PARAMS ((tree));
93 static rtx expand_builtin_memcmp PARAMS ((tree, tree, rtx));
94 static rtx expand_builtin_strcmp PARAMS ((tree, rtx));
96 static rtx expand_builtin_memcpy PARAMS ((tree));
97 static rtx expand_builtin_strcpy PARAMS ((tree));
98 static rtx expand_builtin_memset PARAMS ((tree));
99 static rtx expand_builtin_bzero PARAMS ((tree));
100 static rtx expand_builtin_strlen PARAMS ((tree, rtx,
102 static rtx expand_builtin_alloca PARAMS ((tree, rtx));
103 static rtx expand_builtin_ffs PARAMS ((tree, rtx, rtx));
104 static rtx expand_builtin_frame_address PARAMS ((tree));
105 static tree stabilize_va_list PARAMS ((tree, int));
107 /* Return the alignment in bits of EXP, a pointer valued expression.
108 But don't return more than MAX_ALIGN no matter what.
109 The alignment returned is, by default, the alignment of the thing that
110 EXP points to (if it is not a POINTER_TYPE, 0 is returned).
112 Otherwise, look at the expression to see if we can do better, i.e., if the
113 expression is actually pointing at an object whose alignment is tighter. */
116 get_pointer_alignment (exp, max_align)
120 unsigned align, inner;
122 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
125 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
126 align = MIN (align, max_align);
130 switch (TREE_CODE (exp))
134 case NON_LVALUE_EXPR:
135 exp = TREE_OPERAND (exp, 0);
136 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
139 inner = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
140 align = MIN (inner, max_align);
144 /* If sum of pointer + int, restrict our maximum alignment to that
145 imposed by the integer. If not, we can't do any better than
147 if (! host_integerp (TREE_OPERAND (exp, 1), 1))
150 while (((tree_low_cst (TREE_OPERAND (exp, 1), 1) * BITS_PER_UNIT)
155 exp = TREE_OPERAND (exp, 0);
159 /* See what we are pointing at and look at its alignment. */
160 exp = TREE_OPERAND (exp, 0);
161 if (TREE_CODE (exp) == FUNCTION_DECL)
162 align = FUNCTION_BOUNDARY;
163 else if (DECL_P (exp))
164 align = DECL_ALIGN (exp);
165 #ifdef CONSTANT_ALIGNMENT
166 else if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'c')
167 align = CONSTANT_ALIGNMENT (exp, align);
169 return MIN (align, max_align);
177 /* Compute the length of a C string. TREE_STRING_LENGTH is not the right
178 way, because it could contain a zero byte in the middle.
179 TREE_STRING_LENGTH is the size of the character array, not the string.
181 The value returned is of type `ssizetype'.
183 Unfortunately, string_constant can't access the values of const char
184 arrays with initializers, so neither can we do so here. */
194 src = string_constant (src, &offset_node);
198 max = TREE_STRING_LENGTH (src);
199 ptr = TREE_STRING_POINTER (src);
201 if (offset_node && TREE_CODE (offset_node) != INTEGER_CST)
203 /* If the string has an internal zero byte (e.g., "foo\0bar"), we can't
204 compute the offset to the following null if we don't know where to
205 start searching for it. */
208 for (i = 0; i < max; i++)
212 /* We don't know the starting offset, but we do know that the string
213 has no internal zero bytes. We can assume that the offset falls
214 within the bounds of the string; otherwise, the programmer deserves
215 what he gets. Subtract the offset from the length of the string,
216 and return that. This would perhaps not be valid if we were dealing
217 with named arrays in addition to literal string constants. */
219 return size_diffop (size_int (max), offset_node);
222 /* We have a known offset into the string. Start searching there for
224 if (offset_node == 0)
228 /* Did we get a long long offset? If so, punt. */
229 if (TREE_INT_CST_HIGH (offset_node) != 0)
231 offset = TREE_INT_CST_LOW (offset_node);
234 /* If the offset is known to be out of bounds, warn, and call strlen at
236 if (offset < 0 || offset > max)
238 warning ("offset outside bounds of constant string");
242 /* Use strlen to search for the first zero byte. Since any strings
243 constructed with build_string will have nulls appended, we win even
244 if we get handed something like (char[4])"abcd".
246 Since OFFSET is our starting index into the string, no further
247 calculation is needed. */
248 return ssize_int (strlen (ptr + offset));
251 /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
252 times to get the address of either a higher stack frame, or a return
253 address located within it (depending on FNDECL_CODE). */
256 expand_builtin_return_addr (fndecl_code, count, tem)
257 enum built_in_function fndecl_code;
263 /* Some machines need special handling before we can access
264 arbitrary frames. For example, on the sparc, we must first flush
265 all register windows to the stack. */
266 #ifdef SETUP_FRAME_ADDRESSES
268 SETUP_FRAME_ADDRESSES ();
271 /* On the sparc, the return address is not in the frame, it is in a
272 register. There is no way to access it off of the current frame
273 pointer, but it can be accessed off the previous frame pointer by
274 reading the value from the register window save area. */
275 #ifdef RETURN_ADDR_IN_PREVIOUS_FRAME
276 if (fndecl_code == BUILT_IN_RETURN_ADDRESS)
280 /* Scan back COUNT frames to the specified frame. */
281 for (i = 0; i < count; i++)
283 /* Assume the dynamic chain pointer is in the word that the
284 frame address points to, unless otherwise specified. */
285 #ifdef DYNAMIC_CHAIN_ADDRESS
286 tem = DYNAMIC_CHAIN_ADDRESS (tem);
288 tem = memory_address (Pmode, tem);
289 tem = copy_to_reg (gen_rtx_MEM (Pmode, tem));
292 /* For __builtin_frame_address, return what we've got. */
293 if (fndecl_code == BUILT_IN_FRAME_ADDRESS)
296 /* For __builtin_return_address, Get the return address from that
298 #ifdef RETURN_ADDR_RTX
299 tem = RETURN_ADDR_RTX (count, tem);
301 tem = memory_address (Pmode,
302 plus_constant (tem, GET_MODE_SIZE (Pmode)));
303 tem = gen_rtx_MEM (Pmode, tem);
308 /* __builtin_setjmp is passed a pointer to an array of five words (not
309 all will be used on all machines). It operates similarly to the C
310 library function of the same name, but is more efficient. Much of
311 the code below (and for longjmp) is copied from the handling of
314 NOTE: This is intended for use by GNAT and the exception handling
315 scheme in the compiler and will only work in the method used by
319 expand_builtin_setjmp (buf_addr, target, first_label, next_label)
322 rtx first_label, next_label;
324 rtx lab1 = gen_label_rtx ();
325 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
326 enum machine_mode value_mode;
329 value_mode = TYPE_MODE (integer_type_node);
331 #ifdef POINTERS_EXTEND_UNSIGNED
332 buf_addr = convert_memory_address (Pmode, buf_addr);
335 buf_addr = force_reg (Pmode, force_operand (buf_addr, NULL_RTX));
337 if (target == 0 || GET_CODE (target) != REG
338 || REGNO (target) < FIRST_PSEUDO_REGISTER)
339 target = gen_reg_rtx (value_mode);
343 /* We store the frame pointer and the address of lab1 in the buffer
344 and use the rest of it for the stack save area, which is
345 machine-dependent. */
347 #ifndef BUILTIN_SETJMP_FRAME_VALUE
348 #define BUILTIN_SETJMP_FRAME_VALUE virtual_stack_vars_rtx
351 emit_move_insn (gen_rtx_MEM (Pmode, buf_addr),
352 BUILTIN_SETJMP_FRAME_VALUE);
353 emit_move_insn (validize_mem
355 plus_constant (buf_addr,
356 GET_MODE_SIZE (Pmode)))),
357 force_reg (Pmode, gen_rtx_LABEL_REF (Pmode, lab1)));
359 stack_save = gen_rtx_MEM (sa_mode,
360 plus_constant (buf_addr,
361 2 * GET_MODE_SIZE (Pmode)));
362 emit_stack_save (SAVE_NONLOCAL, &stack_save, NULL_RTX);
364 /* If there is further processing to do, do it. */
365 #ifdef HAVE_builtin_setjmp_setup
366 if (HAVE_builtin_setjmp_setup)
367 emit_insn (gen_builtin_setjmp_setup (buf_addr));
370 /* Set TARGET to zero and branch to the first-time-through label. */
371 emit_move_insn (target, const0_rtx);
372 emit_jump_insn (gen_jump (first_label));
376 /* Tell flow about the strange goings on. Putting `lab1' on
377 `nonlocal_goto_handler_labels' to indicates that function
378 calls may traverse the arc back to this label. */
380 current_function_has_nonlocal_label = 1;
381 nonlocal_goto_handler_labels =
382 gen_rtx_EXPR_LIST (VOIDmode, lab1, nonlocal_goto_handler_labels);
384 /* Clobber the FP when we get here, so we have to make sure it's
385 marked as used by this function. */
386 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
388 /* Mark the static chain as clobbered here so life information
389 doesn't get messed up for it. */
390 emit_insn (gen_rtx_CLOBBER (VOIDmode, static_chain_rtx));
392 /* Now put in the code to restore the frame pointer, and argument
393 pointer, if needed. The code below is from expand_end_bindings
394 in stmt.c; see detailed documentation there. */
395 #ifdef HAVE_nonlocal_goto
396 if (! HAVE_nonlocal_goto)
398 emit_move_insn (virtual_stack_vars_rtx, hard_frame_pointer_rtx);
400 #if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
401 if (fixed_regs[ARG_POINTER_REGNUM])
403 #ifdef ELIMINABLE_REGS
405 static struct elims {int from, to;} elim_regs[] = ELIMINABLE_REGS;
407 for (i = 0; i < sizeof elim_regs / sizeof elim_regs[0]; i++)
408 if (elim_regs[i].from == ARG_POINTER_REGNUM
409 && elim_regs[i].to == HARD_FRAME_POINTER_REGNUM)
412 if (i == sizeof elim_regs / sizeof elim_regs [0])
415 /* Now restore our arg pointer from the address at which it
416 was saved in our stack frame.
417 If there hasn't be space allocated for it yet, make
419 if (arg_pointer_save_area == 0)
420 arg_pointer_save_area
421 = assign_stack_local (Pmode, GET_MODE_SIZE (Pmode), 0);
422 emit_move_insn (virtual_incoming_args_rtx,
423 copy_to_reg (arg_pointer_save_area));
428 #ifdef HAVE_builtin_setjmp_receiver
429 if (HAVE_builtin_setjmp_receiver)
430 emit_insn (gen_builtin_setjmp_receiver (lab1));
433 #ifdef HAVE_nonlocal_goto_receiver
434 if (HAVE_nonlocal_goto_receiver)
435 emit_insn (gen_nonlocal_goto_receiver ());
442 /* Set TARGET, and branch to the next-time-through label. */
443 emit_move_insn (target, const1_rtx);
444 emit_jump_insn (gen_jump (next_label));
450 /* __builtin_longjmp is passed a pointer to an array of five words (not
451 all will be used on all machines). It operates similarly to the C
452 library function of the same name, but is more efficient. Much of
453 the code below is copied from the handling of non-local gotos.
455 NOTE: This is intended for use by GNAT and the exception handling
456 scheme in the compiler and will only work in the method used by
460 expand_builtin_longjmp (buf_addr, value)
464 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
466 #ifdef POINTERS_EXTEND_UNSIGNED
467 buf_addr = convert_memory_address (Pmode, buf_addr);
469 buf_addr = force_reg (Pmode, buf_addr);
471 /* We used to store value in static_chain_rtx, but that fails if pointers
472 are smaller than integers. We instead require that the user must pass
473 a second argument of 1, because that is what builtin_setjmp will
474 return. This also makes EH slightly more efficient, since we are no
475 longer copying around a value that we don't care about. */
476 if (value != const1_rtx)
479 #ifdef HAVE_builtin_longjmp
480 if (HAVE_builtin_longjmp)
481 emit_insn (gen_builtin_longjmp (buf_addr));
485 fp = gen_rtx_MEM (Pmode, buf_addr);
486 lab = gen_rtx_MEM (Pmode, plus_constant (buf_addr,
487 GET_MODE_SIZE (Pmode)));
489 stack = gen_rtx_MEM (sa_mode, plus_constant (buf_addr,
490 2 * GET_MODE_SIZE (Pmode)));
492 /* Pick up FP, label, and SP from the block and jump. This code is
493 from expand_goto in stmt.c; see there for detailed comments. */
494 #if HAVE_nonlocal_goto
495 if (HAVE_nonlocal_goto)
496 /* We have to pass a value to the nonlocal_goto pattern that will
497 get copied into the static_chain pointer, but it does not matter
498 what that value is, because builtin_setjmp does not use it. */
499 emit_insn (gen_nonlocal_goto (value, fp, stack, lab));
503 lab = copy_to_reg (lab);
505 emit_move_insn (hard_frame_pointer_rtx, fp);
506 emit_stack_restore (SAVE_NONLOCAL, stack, NULL_RTX);
508 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
509 emit_insn (gen_rtx_USE (VOIDmode, stack_pointer_rtx));
510 emit_indirect_jump (lab);
515 /* Get a MEM rtx for expression EXP which can be used in a string instruction
516 (cmpstrsi, movstrsi, ..). */
524 mem = gen_rtx_MEM (BLKmode,
525 memory_address (BLKmode,
526 expand_expr (exp, NULL_RTX,
527 ptr_mode, EXPAND_SUM)));
529 RTX_UNCHANGING_P (mem) = TREE_READONLY (exp);
531 /* Figure out the type of the object pointed to. Set MEM_IN_STRUCT_P
532 if the value is the address of a structure or if the expression is
533 cast to a pointer to structure type. */
536 while (TREE_CODE (exp) == NOP_EXPR)
538 tree cast_type = TREE_TYPE (exp);
539 if (TREE_CODE (cast_type) == POINTER_TYPE
540 && AGGREGATE_TYPE_P (TREE_TYPE (cast_type)))
545 exp = TREE_OPERAND (exp, 0);
548 if (is_aggregate == 0)
552 if (TREE_CODE (exp) == ADDR_EXPR)
553 /* If this is the address of an object, check whether the
554 object is an array. */
555 type = TREE_TYPE (TREE_OPERAND (exp, 0));
557 type = TREE_TYPE (TREE_TYPE (exp));
558 is_aggregate = AGGREGATE_TYPE_P (type);
561 MEM_SET_IN_STRUCT_P (mem, is_aggregate);
565 /* Built-in functions to perform an untyped call and return. */
567 /* For each register that may be used for calling a function, this
568 gives a mode used to copy the register's value. VOIDmode indicates
569 the register is not used for calling a function. If the machine
570 has register windows, this gives only the outbound registers.
571 INCOMING_REGNO gives the corresponding inbound register. */
572 static enum machine_mode apply_args_mode[FIRST_PSEUDO_REGISTER];
574 /* For each register that may be used for returning values, this gives
575 a mode used to copy the register's value. VOIDmode indicates the
576 register is not used for returning values. If the machine has
577 register windows, this gives only the outbound registers.
578 INCOMING_REGNO gives the corresponding inbound register. */
579 static enum machine_mode apply_result_mode[FIRST_PSEUDO_REGISTER];
581 /* For each register that may be used for calling a function, this
582 gives the offset of that register into the block returned by
583 __builtin_apply_args. 0 indicates that the register is not
584 used for calling a function. */
585 static int apply_args_reg_offset[FIRST_PSEUDO_REGISTER];
587 /* Return the offset of register REGNO into the block returned by
588 __builtin_apply_args. This is not declared static, since it is
589 needed in objc-act.c. */
592 apply_args_register_offset (regno)
597 /* Arguments are always put in outgoing registers (in the argument
598 block) if such make sense. */
599 #ifdef OUTGOING_REGNO
600 regno = OUTGOING_REGNO(regno);
602 return apply_args_reg_offset[regno];
605 /* Return the size required for the block returned by __builtin_apply_args,
606 and initialize apply_args_mode. */
611 static int size = -1;
613 enum machine_mode mode;
615 /* The values computed by this function never change. */
618 /* The first value is the incoming arg-pointer. */
619 size = GET_MODE_SIZE (Pmode);
621 /* The second value is the structure value address unless this is
622 passed as an "invisible" first argument. */
623 if (struct_value_rtx)
624 size += GET_MODE_SIZE (Pmode);
626 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
627 if (FUNCTION_ARG_REGNO_P (regno))
629 /* Search for the proper mode for copying this register's
630 value. I'm not sure this is right, but it works so far. */
631 enum machine_mode best_mode = VOIDmode;
633 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
635 mode = GET_MODE_WIDER_MODE (mode))
636 if (HARD_REGNO_MODE_OK (regno, mode)
637 && HARD_REGNO_NREGS (regno, mode) == 1)
640 if (best_mode == VOIDmode)
641 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
643 mode = GET_MODE_WIDER_MODE (mode))
644 if (HARD_REGNO_MODE_OK (regno, mode)
645 && (mov_optab->handlers[(int) mode].insn_code
646 != CODE_FOR_nothing))
650 if (mode == VOIDmode)
653 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
654 if (size % align != 0)
655 size = CEIL (size, align) * align;
656 apply_args_reg_offset[regno] = size;
657 size += GET_MODE_SIZE (mode);
658 apply_args_mode[regno] = mode;
662 apply_args_mode[regno] = VOIDmode;
663 apply_args_reg_offset[regno] = 0;
669 /* Return the size required for the block returned by __builtin_apply,
670 and initialize apply_result_mode. */
675 static int size = -1;
677 enum machine_mode mode;
679 /* The values computed by this function never change. */
684 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
685 if (FUNCTION_VALUE_REGNO_P (regno))
687 /* Search for the proper mode for copying this register's
688 value. I'm not sure this is right, but it works so far. */
689 enum machine_mode best_mode = VOIDmode;
691 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
693 mode = GET_MODE_WIDER_MODE (mode))
694 if (HARD_REGNO_MODE_OK (regno, mode))
697 if (best_mode == VOIDmode)
698 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
700 mode = GET_MODE_WIDER_MODE (mode))
701 if (HARD_REGNO_MODE_OK (regno, mode)
702 && (mov_optab->handlers[(int) mode].insn_code
703 != CODE_FOR_nothing))
707 if (mode == VOIDmode)
710 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
711 if (size % align != 0)
712 size = CEIL (size, align) * align;
713 size += GET_MODE_SIZE (mode);
714 apply_result_mode[regno] = mode;
717 apply_result_mode[regno] = VOIDmode;
719 /* Allow targets that use untyped_call and untyped_return to override
720 the size so that machine-specific information can be stored here. */
721 #ifdef APPLY_RESULT_SIZE
722 size = APPLY_RESULT_SIZE;
728 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
729 /* Create a vector describing the result block RESULT. If SAVEP is true,
730 the result block is used to save the values; otherwise it is used to
731 restore the values. */
734 result_vector (savep, result)
738 int regno, size, align, nelts;
739 enum machine_mode mode;
741 rtx *savevec = (rtx *) alloca (FIRST_PSEUDO_REGISTER * sizeof (rtx));
744 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
745 if ((mode = apply_result_mode[regno]) != VOIDmode)
747 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
748 if (size % align != 0)
749 size = CEIL (size, align) * align;
750 reg = gen_rtx_REG (mode, savep ? regno : INCOMING_REGNO (regno));
751 mem = change_address (result, mode,
752 plus_constant (XEXP (result, 0), size));
753 savevec[nelts++] = (savep
754 ? gen_rtx_SET (VOIDmode, mem, reg)
755 : gen_rtx_SET (VOIDmode, reg, mem));
756 size += GET_MODE_SIZE (mode);
758 return gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (nelts, savevec));
760 #endif /* HAVE_untyped_call or HAVE_untyped_return */
762 /* Save the state required to perform an untyped call with the same
763 arguments as were passed to the current function. */
766 expand_builtin_apply_args_1 ()
769 int size, align, regno;
770 enum machine_mode mode;
772 /* Create a block where the arg-pointer, structure value address,
773 and argument registers can be saved. */
774 registers = assign_stack_local (BLKmode, apply_args_size (), -1);
776 /* Walk past the arg-pointer and structure value address. */
777 size = GET_MODE_SIZE (Pmode);
778 if (struct_value_rtx)
779 size += GET_MODE_SIZE (Pmode);
781 /* Save each register used in calling a function to the block. */
782 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
783 if ((mode = apply_args_mode[regno]) != VOIDmode)
787 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
788 if (size % align != 0)
789 size = CEIL (size, align) * align;
791 tem = gen_rtx_REG (mode, INCOMING_REGNO (regno));
793 emit_move_insn (change_address (registers, mode,
794 plus_constant (XEXP (registers, 0),
797 size += GET_MODE_SIZE (mode);
800 /* Save the arg pointer to the block. */
801 emit_move_insn (change_address (registers, Pmode, XEXP (registers, 0)),
802 copy_to_reg (virtual_incoming_args_rtx));
803 size = GET_MODE_SIZE (Pmode);
805 /* Save the structure value address unless this is passed as an
806 "invisible" first argument. */
807 if (struct_value_incoming_rtx)
809 emit_move_insn (change_address (registers, Pmode,
810 plus_constant (XEXP (registers, 0),
812 copy_to_reg (struct_value_incoming_rtx));
813 size += GET_MODE_SIZE (Pmode);
816 /* Return the address of the block. */
817 return copy_addr_to_reg (XEXP (registers, 0));
820 /* __builtin_apply_args returns block of memory allocated on
821 the stack into which is stored the arg pointer, structure
822 value address, static chain, and all the registers that might
823 possibly be used in performing a function call. The code is
824 moved to the start of the function so the incoming values are
827 expand_builtin_apply_args ()
829 /* Don't do __builtin_apply_args more than once in a function.
830 Save the result of the first call and reuse it. */
831 if (apply_args_value != 0)
832 return apply_args_value;
834 /* When this function is called, it means that registers must be
835 saved on entry to this function. So we migrate the
836 call to the first insn of this function. */
841 temp = expand_builtin_apply_args_1 ();
845 apply_args_value = temp;
847 /* Put the sequence after the NOTE that starts the function.
848 If this is inside a SEQUENCE, make the outer-level insn
849 chain current, so the code is placed at the start of the
851 push_topmost_sequence ();
852 emit_insns_before (seq, NEXT_INSN (get_insns ()));
853 pop_topmost_sequence ();
858 /* Perform an untyped call and save the state required to perform an
859 untyped return of whatever value was returned by the given function. */
862 expand_builtin_apply (function, arguments, argsize)
863 rtx function, arguments, argsize;
865 int size, align, regno;
866 enum machine_mode mode;
867 rtx incoming_args, result, reg, dest, call_insn;
868 rtx old_stack_level = 0;
871 /* Create a block where the return registers can be saved. */
872 result = assign_stack_local (BLKmode, apply_result_size (), -1);
874 /* Fetch the arg pointer from the ARGUMENTS block. */
875 incoming_args = gen_reg_rtx (Pmode);
876 emit_move_insn (incoming_args,
877 gen_rtx_MEM (Pmode, arguments));
878 #ifndef STACK_GROWS_DOWNWARD
879 incoming_args = expand_binop (Pmode, sub_optab, incoming_args, argsize,
880 incoming_args, 0, OPTAB_LIB_WIDEN);
883 /* Perform postincrements before actually calling the function. */
886 /* Push a new argument block and copy the arguments. */
887 do_pending_stack_adjust ();
889 /* Save the stack with nonlocal if available */
890 #ifdef HAVE_save_stack_nonlocal
891 if (HAVE_save_stack_nonlocal)
892 emit_stack_save (SAVE_NONLOCAL, &old_stack_level, NULL_RTX);
895 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
897 /* Push a block of memory onto the stack to store the memory arguments.
898 Save the address in a register, and copy the memory arguments. ??? I
899 haven't figured out how the calling convention macros effect this,
900 but it's likely that the source and/or destination addresses in
901 the block copy will need updating in machine specific ways. */
902 dest = allocate_dynamic_stack_space (argsize, 0, BITS_PER_UNIT);
903 emit_block_move (gen_rtx_MEM (BLKmode, dest),
904 gen_rtx_MEM (BLKmode, incoming_args),
905 argsize, PARM_BOUNDARY);
907 /* Refer to the argument block. */
909 arguments = gen_rtx_MEM (BLKmode, arguments);
911 /* Walk past the arg-pointer and structure value address. */
912 size = GET_MODE_SIZE (Pmode);
913 if (struct_value_rtx)
914 size += GET_MODE_SIZE (Pmode);
916 /* Restore each of the registers previously saved. Make USE insns
917 for each of these registers for use in making the call. */
918 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
919 if ((mode = apply_args_mode[regno]) != VOIDmode)
921 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
922 if (size % align != 0)
923 size = CEIL (size, align) * align;
924 reg = gen_rtx_REG (mode, regno);
926 change_address (arguments, mode,
927 plus_constant (XEXP (arguments, 0),
930 use_reg (&call_fusage, reg);
931 size += GET_MODE_SIZE (mode);
934 /* Restore the structure value address unless this is passed as an
935 "invisible" first argument. */
936 size = GET_MODE_SIZE (Pmode);
937 if (struct_value_rtx)
939 rtx value = gen_reg_rtx (Pmode);
940 emit_move_insn (value,
941 change_address (arguments, Pmode,
942 plus_constant (XEXP (arguments, 0),
944 emit_move_insn (struct_value_rtx, value);
945 if (GET_CODE (struct_value_rtx) == REG)
946 use_reg (&call_fusage, struct_value_rtx);
947 size += GET_MODE_SIZE (Pmode);
950 /* All arguments and registers used for the call are set up by now! */
951 function = prepare_call_address (function, NULL_TREE, &call_fusage, 0);
953 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
954 and we don't want to load it into a register as an optimization,
955 because prepare_call_address already did it if it should be done. */
956 if (GET_CODE (function) != SYMBOL_REF)
957 function = memory_address (FUNCTION_MODE, function);
959 /* Generate the actual call instruction and save the return value. */
960 #ifdef HAVE_untyped_call
961 if (HAVE_untyped_call)
962 emit_call_insn (gen_untyped_call (gen_rtx_MEM (FUNCTION_MODE, function),
963 result, result_vector (1, result)));
966 #ifdef HAVE_call_value
971 /* Locate the unique return register. It is not possible to
972 express a call that sets more than one return register using
973 call_value; use untyped_call for that. In fact, untyped_call
974 only needs to save the return registers in the given block. */
975 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
976 if ((mode = apply_result_mode[regno]) != VOIDmode)
979 abort (); /* HAVE_untyped_call required. */
980 valreg = gen_rtx_REG (mode, regno);
983 emit_call_insn (gen_call_value (valreg,
984 gen_rtx_MEM (FUNCTION_MODE, function),
985 const0_rtx, NULL_RTX, const0_rtx));
987 emit_move_insn (change_address (result, GET_MODE (valreg),
995 /* Find the CALL insn we just emitted. */
996 for (call_insn = get_last_insn ();
997 call_insn && GET_CODE (call_insn) != CALL_INSN;
998 call_insn = PREV_INSN (call_insn))
1004 /* Put the register usage information on the CALL. If there is already
1005 some usage information, put ours at the end. */
1006 if (CALL_INSN_FUNCTION_USAGE (call_insn))
1010 for (link = CALL_INSN_FUNCTION_USAGE (call_insn); XEXP (link, 1) != 0;
1011 link = XEXP (link, 1))
1014 XEXP (link, 1) = call_fusage;
1017 CALL_INSN_FUNCTION_USAGE (call_insn) = call_fusage;
1019 /* Restore the stack. */
1020 #ifdef HAVE_save_stack_nonlocal
1021 if (HAVE_save_stack_nonlocal)
1022 emit_stack_restore (SAVE_NONLOCAL, old_stack_level, NULL_RTX);
1025 emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX);
1027 /* Return the address of the result block. */
1028 return copy_addr_to_reg (XEXP (result, 0));
1031 /* Perform an untyped return. */
1034 expand_builtin_return (result)
1037 int size, align, regno;
1038 enum machine_mode mode;
1040 rtx call_fusage = 0;
1042 apply_result_size ();
1043 result = gen_rtx_MEM (BLKmode, result);
1045 #ifdef HAVE_untyped_return
1046 if (HAVE_untyped_return)
1048 emit_jump_insn (gen_untyped_return (result, result_vector (0, result)));
1054 /* Restore the return value and note that each value is used. */
1056 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1057 if ((mode = apply_result_mode[regno]) != VOIDmode)
1059 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1060 if (size % align != 0)
1061 size = CEIL (size, align) * align;
1062 reg = gen_rtx_REG (mode, INCOMING_REGNO (regno));
1063 emit_move_insn (reg,
1064 change_address (result, mode,
1065 plus_constant (XEXP (result, 0),
1068 push_to_sequence (call_fusage);
1069 emit_insn (gen_rtx_USE (VOIDmode, reg));
1070 call_fusage = get_insns ();
1072 size += GET_MODE_SIZE (mode);
1075 /* Put the USE insns before the return. */
1076 emit_insns (call_fusage);
1078 /* Return whatever values was restored by jumping directly to the end
1080 expand_null_return ();
1083 /* Expand a call to __builtin_classify_type with arguments found in
1086 expand_builtin_classify_type (arglist)
1091 tree type = TREE_TYPE (TREE_VALUE (arglist));
1092 enum tree_code code = TREE_CODE (type);
1093 if (code == VOID_TYPE)
1094 return GEN_INT (void_type_class);
1095 if (code == INTEGER_TYPE)
1096 return GEN_INT (integer_type_class);
1097 if (code == CHAR_TYPE)
1098 return GEN_INT (char_type_class);
1099 if (code == ENUMERAL_TYPE)
1100 return GEN_INT (enumeral_type_class);
1101 if (code == BOOLEAN_TYPE)
1102 return GEN_INT (boolean_type_class);
1103 if (code == POINTER_TYPE)
1104 return GEN_INT (pointer_type_class);
1105 if (code == REFERENCE_TYPE)
1106 return GEN_INT (reference_type_class);
1107 if (code == OFFSET_TYPE)
1108 return GEN_INT (offset_type_class);
1109 if (code == REAL_TYPE)
1110 return GEN_INT (real_type_class);
1111 if (code == COMPLEX_TYPE)
1112 return GEN_INT (complex_type_class);
1113 if (code == FUNCTION_TYPE)
1114 return GEN_INT (function_type_class);
1115 if (code == METHOD_TYPE)
1116 return GEN_INT (method_type_class);
1117 if (code == RECORD_TYPE)
1118 return GEN_INT (record_type_class);
1119 if (code == UNION_TYPE || code == QUAL_UNION_TYPE)
1120 return GEN_INT (union_type_class);
1121 if (code == ARRAY_TYPE)
1123 if (TYPE_STRING_FLAG (type))
1124 return GEN_INT (string_type_class);
1126 return GEN_INT (array_type_class);
1128 if (code == SET_TYPE)
1129 return GEN_INT (set_type_class);
1130 if (code == FILE_TYPE)
1131 return GEN_INT (file_type_class);
1132 if (code == LANG_TYPE)
1133 return GEN_INT (lang_type_class);
1135 return GEN_INT (no_type_class);
1138 /* Expand expression EXP, which is a call to __builtin_constant_p. */
1140 expand_builtin_constant_p (exp)
1143 tree arglist = TREE_OPERAND (exp, 1);
1144 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1150 tree arg = TREE_VALUE (arglist);
1153 /* We return 1 for a numeric type that's known to be a constant
1154 value at compile-time or for an aggregate type that's a
1155 literal constant. */
1158 /* If we know this is a constant, emit the constant of one. */
1159 if (TREE_CODE_CLASS (TREE_CODE (arg)) == 'c'
1160 || (TREE_CODE (arg) == CONSTRUCTOR
1161 && TREE_CONSTANT (arg))
1162 || (TREE_CODE (arg) == ADDR_EXPR
1163 && TREE_CODE (TREE_OPERAND (arg, 0)) == STRING_CST))
1166 /* If we aren't going to be running CSE or this expression
1167 has side effects, show we don't know it to be a constant.
1168 Likewise if it's a pointer or aggregate type since in those
1169 case we only want literals, since those are only optimized
1170 when generating RTL, not later. */
1171 if (TREE_SIDE_EFFECTS (arg) || cse_not_expected
1172 || AGGREGATE_TYPE_P (TREE_TYPE (arg))
1173 || POINTER_TYPE_P (TREE_TYPE (arg)))
1176 /* Otherwise, emit (constant_p_rtx (ARG)) and let CSE get a
1177 chance to see if it can deduce whether ARG is constant. */
1179 tmp = expand_expr (arg, NULL_RTX, VOIDmode, 0);
1180 tmp = gen_rtx_CONSTANT_P_RTX (value_mode, tmp);
1185 /* Expand a call to one of the builtin math functions (sin, cos, or sqrt).
1186 Return 0 if a normal call should be emitted rather than expanding the
1187 function in-line. EXP is the expression that is a call to the builtin
1188 function; if convenient, the result should be placed in TARGET.
1189 SUBTARGET may be used as the target for computing one of EXP's operands. */
1191 expand_builtin_mathfn (exp, target, subtarget)
1193 rtx target, subtarget;
1195 optab builtin_optab;
1197 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
1198 tree arglist = TREE_OPERAND (exp, 1);
1201 /* Arg could be wrong type if user redeclared this fcn wrong. */
1202 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != REAL_TYPE)
1205 /* Stabilize and compute the argument. */
1206 if (TREE_CODE (TREE_VALUE (arglist)) != VAR_DECL
1207 && TREE_CODE (TREE_VALUE (arglist)) != PARM_DECL)
1209 exp = copy_node (exp);
1210 TREE_OPERAND (exp, 1) = arglist;
1211 /* Wrap the computation of the argument in a SAVE_EXPR. That
1212 way, if we need to expand the argument again (as in the
1213 flag_errno_math case below where we cannot directly set
1214 errno), we will not perform side-effects more than once.
1215 Note that here we're mutating the original EXP as well as the
1216 copy; that's the right thing to do in case the original EXP
1217 is expanded later. */
1218 TREE_VALUE (arglist) = save_expr (TREE_VALUE (arglist));
1219 arglist = copy_node (arglist);
1221 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
1223 /* Make a suitable register to place result in. */
1224 target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));
1229 switch (DECL_FUNCTION_CODE (fndecl))
1232 builtin_optab = sin_optab; break;
1234 builtin_optab = cos_optab; break;
1235 case BUILT_IN_FSQRT:
1236 builtin_optab = sqrt_optab; break;
1241 /* Compute into TARGET.
1242 Set TARGET to wherever the result comes back. */
1243 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
1244 builtin_optab, op0, target, 0);
1246 /* If we were unable to expand via the builtin, stop the
1247 sequence (without outputting the insns) and return 0, causing
1248 a call to the library function. */
1255 /* Check the results by default. But if flag_fast_math is turned on,
1256 then assume sqrt will always be called with valid arguments. */
1258 if (flag_errno_math && ! flag_fast_math)
1262 /* Don't define the builtin FP instructions
1263 if your machine is not IEEE. */
1264 if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT)
1267 lab1 = gen_label_rtx ();
1269 /* Test the result; if it is NaN, set errno=EDOM because
1270 the argument was not in the domain. */
1271 emit_cmp_and_jump_insns (target, target, EQ, 0, GET_MODE (target),
1276 #ifdef GEN_ERRNO_RTX
1277 rtx errno_rtx = GEN_ERRNO_RTX;
1280 = gen_rtx_MEM (word_mode, gen_rtx_SYMBOL_REF (Pmode, "errno"));
1283 emit_move_insn (errno_rtx, GEN_INT (TARGET_EDOM));
1286 /* We can't set errno=EDOM directly; let the library call do it.
1287 Pop the arguments right away in case the call gets deleted. */
1289 expand_call (exp, target, 0);
1296 /* Output the entire sequence. */
1297 insns = get_insns ();
1304 /* Expand expression EXP which is a call to the strlen builtin. Return 0
1305 if we failed the caller should emit a normal call, otherwise
1306 try to get the result in TARGET, if convenient (and in mode MODE if that's
1309 expand_builtin_strlen (exp, target, mode)
1312 enum machine_mode mode;
1314 tree arglist = TREE_OPERAND (exp, 1);
1315 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1318 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1319 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE)
1324 tree src = TREE_VALUE (arglist);
1325 tree len = c_strlen (src);
1328 = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1330 rtx result, src_reg, char_rtx, before_strlen;
1331 enum machine_mode insn_mode = value_mode, char_mode;
1332 enum insn_code icode = CODE_FOR_nothing;
1334 /* If the length is known, just return it. */
1336 return expand_expr (len, target, mode, EXPAND_MEMORY_USE_BAD);
1338 /* If SRC is not a pointer type, don't do this operation inline. */
1342 /* Bail out if we can't compute strlen in the right mode. */
1343 while (insn_mode != VOIDmode)
1345 icode = strlen_optab->handlers[(int) insn_mode].insn_code;
1346 if (icode != CODE_FOR_nothing)
1349 insn_mode = GET_MODE_WIDER_MODE (insn_mode);
1351 if (insn_mode == VOIDmode)
1354 /* Make a place to write the result of the instruction. */
1357 && GET_CODE (result) == REG
1358 && GET_MODE (result) == insn_mode
1359 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
1360 result = gen_reg_rtx (insn_mode);
1362 /* Make a place to hold the source address. We will not expand
1363 the actual source until we are sure that the expansion will
1364 not fail -- there are trees that cannot be expanded twice. */
1365 src_reg = gen_reg_rtx (Pmode);
1367 /* Mark the beginning of the strlen sequence so we can emit the
1368 source operand later. */
1369 before_strlen = get_last_insn();
1371 /* Check the string is readable and has an end. */
1372 if (current_function_check_memory_usage)
1373 emit_library_call (chkr_check_str_libfunc, 1, VOIDmode, 2,
1375 GEN_INT (MEMORY_USE_RO),
1376 TYPE_MODE (integer_type_node));
1378 char_rtx = const0_rtx;
1379 char_mode = insn_data[(int)icode].operand[2].mode;
1380 if (! (*insn_data[(int)icode].operand[2].predicate) (char_rtx, char_mode))
1381 char_rtx = copy_to_mode_reg (char_mode, char_rtx);
1383 pat = GEN_FCN (icode) (result, gen_rtx_MEM (BLKmode, src_reg),
1384 char_rtx, GEN_INT (align));
1389 /* Now that we are assured of success, expand the source. */
1391 pat = memory_address (BLKmode,
1392 expand_expr (src, src_reg, ptr_mode, EXPAND_SUM));
1394 emit_move_insn (src_reg, pat);
1395 pat = gen_sequence ();
1399 emit_insn_after (pat, before_strlen);
1401 emit_insn_before (pat, get_insns ());
1403 /* Return the value in the proper mode for this function. */
1404 if (GET_MODE (result) == value_mode)
1406 else if (target != 0)
1407 convert_move (target, result, 0);
1409 target = convert_to_mode (value_mode, result, 0);
1415 /* Expand a call to the memcpy builtin, with arguments in ARGLIST. */
1417 expand_builtin_memcpy (arglist)
1421 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1422 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
1423 || TREE_CHAIN (arglist) == 0
1424 || (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist))))
1426 || TREE_CHAIN (TREE_CHAIN (arglist)) == 0
1427 || (TREE_CODE (TREE_TYPE (TREE_VALUE
1428 (TREE_CHAIN (TREE_CHAIN (arglist)))))
1433 tree dest = TREE_VALUE (arglist);
1434 tree src = TREE_VALUE (TREE_CHAIN (arglist));
1435 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1437 int src_align = get_pointer_alignment (src, BIGGEST_ALIGNMENT);
1438 int dest_align = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
1439 rtx dest_mem, src_mem, dest_addr, len_rtx;
1441 /* If either SRC or DEST is not a pointer type, don't do
1442 this operation in-line. */
1443 if (src_align == 0 || dest_align == 0)
1446 dest_mem = get_memory_rtx (dest);
1447 src_mem = get_memory_rtx (src);
1448 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
1450 /* Just copy the rights of SRC to the rights of DEST. */
1451 if (current_function_check_memory_usage)
1452 emit_library_call (chkr_copy_bitmap_libfunc, 1, VOIDmode, 3,
1453 XEXP (dest_mem, 0), Pmode,
1454 XEXP (src_mem, 0), Pmode,
1455 len_rtx, TYPE_MODE (sizetype));
1457 /* Copy word part most expediently. */
1459 = emit_block_move (dest_mem, src_mem, len_rtx,
1460 MIN (src_align, dest_align));
1463 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
1469 /* Expand expression EXP, which is a call to the strcpy builtin. Return 0
1470 if we failed the caller should emit a normal call. */
1473 expand_builtin_strcpy (exp)
1476 tree arglist = TREE_OPERAND (exp, 1);
1480 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1481 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
1482 || TREE_CHAIN (arglist) == 0
1483 || (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist))))
1488 tree len = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
1493 len = size_binop (PLUS_EXPR, len, ssize_int (1));
1494 chainon (arglist, build_tree_list (NULL_TREE, len));
1497 result = expand_builtin_memcpy (arglist);
1500 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
1504 /* Expand expression EXP, which is a call to the memset builtin. Return 0
1505 if we failed the caller should emit a normal call. */
1508 expand_builtin_memset (exp)
1511 tree arglist = TREE_OPERAND (exp, 1);
1514 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1515 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
1516 || TREE_CHAIN (arglist) == 0
1517 || (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist))))
1519 || TREE_CHAIN (TREE_CHAIN (arglist)) == 0
1521 != (TREE_CODE (TREE_TYPE
1523 (TREE_CHAIN (TREE_CHAIN (arglist))))))))
1527 tree dest = TREE_VALUE (arglist);
1528 tree val = TREE_VALUE (TREE_CHAIN (arglist));
1529 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1531 int dest_align = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
1532 rtx dest_mem, dest_addr, len_rtx;
1534 /* If DEST is not a pointer type, don't do this
1535 operation in-line. */
1536 if (dest_align == 0)
1539 /* If the arguments have side-effects, then we can only evaluate
1540 them at most once. The following code evaluates them twice if
1541 they are not constants because we break out to expand_call
1542 in that case. They can't be constants if they have side-effects
1543 so we can check for that first. Alternatively, we could call
1544 save_expr to make multiple evaluation safe. */
1545 if (TREE_SIDE_EFFECTS (val) || TREE_SIDE_EFFECTS (len))
1548 /* If VAL is not 0, don't do this operation in-line. */
1549 if (expand_expr (val, NULL_RTX, VOIDmode, 0) != const0_rtx)
1552 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
1554 dest_mem = get_memory_rtx (dest);
1556 /* Just check DST is writable and mark it as readable. */
1557 if (current_function_check_memory_usage)
1558 emit_library_call (chkr_check_addr_libfunc, 1, VOIDmode, 3,
1559 XEXP (dest_mem, 0), Pmode,
1560 len_rtx, TYPE_MODE (sizetype),
1561 GEN_INT (MEMORY_USE_WO),
1562 TYPE_MODE (integer_type_node));
1565 dest_addr = clear_storage (dest_mem, len_rtx, dest_align);
1568 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
1574 /* Expand expression EXP, which is a call to the bzero builtin. Return 0
1575 if we failed the caller should emit a normal call. */
1577 expand_builtin_bzero (exp)
1580 tree arglist = TREE_OPERAND (exp, 1);
1581 tree dest, size, newarglist;
1585 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1586 || TREE_CODE (TREE_TYPE (dest = TREE_VALUE (arglist))) != POINTER_TYPE
1587 || TREE_CHAIN (arglist) == 0
1588 || (TREE_CODE (TREE_TYPE (size = TREE_VALUE (TREE_CHAIN (arglist))))
1592 /* New argument list transforming bzero(ptr x, int y) to
1593 memset(ptr x, int 0, size_t y). */
1595 newarglist = build_tree_list (NULL_TREE, convert (sizetype, size));
1596 newarglist = tree_cons (NULL_TREE, integer_zero_node, newarglist);
1597 newarglist = tree_cons (NULL_TREE, dest, newarglist);
1599 TREE_OPERAND (exp, 1) = newarglist;
1600 result = expand_builtin_memset(exp);
1602 /* Always restore the original arguments. */
1603 TREE_OPERAND (exp, 1) = arglist;
1608 #ifdef HAVE_cmpstrsi
1609 /* Expand expression EXP, which is a call to the memcmp or the strcmp builtin.
1610 ARGLIST is the argument list for this call. Return 0 if we failed and the
1611 caller should emit a normal call, otherwise try to get the result in
1612 TARGET, if convenient. */
1614 expand_builtin_memcmp (exp, arglist, target)
1619 /* If we need to check memory accesses, call the library function. */
1620 if (current_function_check_memory_usage)
1624 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1625 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
1626 || TREE_CHAIN (arglist) == 0
1627 || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) != POINTER_TYPE
1628 || TREE_CHAIN (TREE_CHAIN (arglist)) == 0
1629 || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))))) != INTEGER_TYPE)
1631 else if (!HAVE_cmpstrsi)
1635 enum machine_mode mode;
1636 tree arg1 = TREE_VALUE (arglist);
1637 tree arg2 = TREE_VALUE (TREE_CHAIN (arglist));
1638 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1642 = get_pointer_alignment (arg1, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1644 = get_pointer_alignment (arg2, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1645 enum machine_mode insn_mode
1646 = insn_data[(int) CODE_FOR_cmpstrsi].operand[0].mode;
1648 /* If we don't have POINTER_TYPE, call the function. */
1649 if (arg1_align == 0 || arg2_align == 0)
1652 /* Make a place to write the result of the instruction. */
1655 && GET_CODE (result) == REG && GET_MODE (result) == insn_mode
1656 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
1657 result = gen_reg_rtx (insn_mode);
1659 emit_insn (gen_cmpstrsi (result, get_memory_rtx (arg1),
1660 get_memory_rtx (arg2),
1661 expand_expr (len, NULL_RTX, VOIDmode, 0),
1662 GEN_INT (MIN (arg1_align, arg2_align))));
1664 /* Return the value in the proper mode for this function. */
1665 mode = TYPE_MODE (TREE_TYPE (exp));
1666 if (GET_MODE (result) == mode)
1668 else if (target != 0)
1670 convert_move (target, result, 0);
1674 return convert_to_mode (mode, result, 0);
1678 /* Expand expression EXP, which is a call to the strcmp builtin. Return 0
1679 if we failed the caller should emit a normal call, otherwise try to get
1680 the result in TARGET, if convenient. */
1683 expand_builtin_strcmp (exp, target)
1687 tree arglist = TREE_OPERAND (exp, 1);
1689 /* If we need to check memory accesses, call the library function. */
1690 if (current_function_check_memory_usage)
1694 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1695 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
1696 || TREE_CHAIN (arglist) == 0
1697 || (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist))))
1701 else if (! HAVE_cmpstrsi)
1704 tree arg1 = TREE_VALUE (arglist);
1705 tree arg2 = TREE_VALUE (TREE_CHAIN (arglist));
1706 tree len = c_strlen (arg1);
1707 tree len2 = c_strlen (arg2);
1711 len = size_binop (PLUS_EXPR, ssize_int (1), len);
1714 len2 = size_binop (PLUS_EXPR, ssize_int (1), len2);
1716 /* If we don't have a constant length for the first, use the length
1717 of the second, if we know it. We don't require a constant for
1718 this case; some cost analysis could be done if both are available
1719 but neither is constant. For now, assume they're equally cheap.
1721 If both strings have constant lengths, use the smaller. This
1722 could arise if optimization results in strcpy being called with
1723 two fixed strings, or if the code was machine-generated. We should
1724 add some code to the `memcmp' handler below to deal with such
1725 situations, someday. */
1727 if (!len || TREE_CODE (len) != INTEGER_CST)
1734 else if (len2 && TREE_CODE (len2) == INTEGER_CST
1735 && tree_int_cst_lt (len2, len))
1738 chainon (arglist, build_tree_list (NULL_TREE, len));
1739 result = expand_builtin_memcmp (exp, arglist, target);
1741 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
1748 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
1749 if that's convenient. */
1752 expand_builtin_saveregs ()
1756 /* Don't do __builtin_saveregs more than once in a function.
1757 Save the result of the first call and reuse it. */
1758 if (saveregs_value != 0)
1759 return saveregs_value;
1761 /* When this function is called, it means that registers must be
1762 saved on entry to this function. So we migrate the call to the
1763 first insn of this function. */
1767 #ifdef EXPAND_BUILTIN_SAVEREGS
1768 /* Do whatever the machine needs done in this case. */
1769 val = EXPAND_BUILTIN_SAVEREGS ();
1771 /* ??? We used to try and build up a call to the out of line function,
1772 guessing about what registers needed saving etc. This became much
1773 harder with __builtin_va_start, since we don't have a tree for a
1774 call to __builtin_saveregs to fall back on. There was exactly one
1775 port (i860) that used this code, and I'm unconvinced it could actually
1776 handle the general case. So we no longer try to handle anything
1777 weird and make the backend absorb the evil. */
1779 error ("__builtin_saveregs not supported by this target");
1786 saveregs_value = val;
1788 /* Put the sequence after the NOTE that starts the function. If this
1789 is inside a SEQUENCE, make the outer-level insn chain current, so
1790 the code is placed at the start of the function. */
1791 push_topmost_sequence ();
1792 emit_insns_after (seq, get_insns ());
1793 pop_topmost_sequence ();
1798 /* __builtin_args_info (N) returns word N of the arg space info
1799 for the current function. The number and meanings of words
1800 is controlled by the definition of CUMULATIVE_ARGS. */
1802 expand_builtin_args_info (exp)
1805 tree arglist = TREE_OPERAND (exp, 1);
1806 int nwords = sizeof (CUMULATIVE_ARGS) / sizeof (int);
1807 int *word_ptr = (int *) ¤t_function_args_info;
1809 /* These are used by the code below that is if 0'ed away */
1811 tree type, elts, result;
1814 if (sizeof (CUMULATIVE_ARGS) % sizeof (int) != 0)
1819 tree arg = TREE_VALUE (arglist);
1820 if (TREE_CODE (arg) != INTEGER_CST)
1821 error ("argument of `__builtin_args_info' must be constant");
1824 int wordnum = TREE_INT_CST_LOW (arg);
1826 if (wordnum < 0 || wordnum >= nwords || TREE_INT_CST_HIGH (arg))
1827 error ("argument of `__builtin_args_info' out of range");
1829 return GEN_INT (word_ptr[wordnum]);
1833 error ("missing argument in `__builtin_args_info'");
1838 for (i = 0; i < nwords; i++)
1839 elts = tree_cons (NULL_TREE, build_int_2 (word_ptr[i], 0));
1841 type = build_array_type (integer_type_node,
1842 build_index_type (build_int_2 (nwords, 0)));
1843 result = build (CONSTRUCTOR, type, NULL_TREE, nreverse (elts));
1844 TREE_CONSTANT (result) = 1;
1845 TREE_STATIC (result) = 1;
1846 result = build1 (INDIRECT_REF, build_pointer_type (type), result);
1847 TREE_CONSTANT (result) = 1;
1848 return expand_expr (result, NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD);
1852 /* Expand ARGLIST, from a call to __builtin_next_arg. */
1854 expand_builtin_next_arg (arglist)
1857 tree fntype = TREE_TYPE (current_function_decl);
1859 if ((TYPE_ARG_TYPES (fntype) == 0
1860 || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype)))
1862 && ! current_function_varargs)
1864 error ("`va_start' used in function with fixed args");
1870 tree last_parm = tree_last (DECL_ARGUMENTS (current_function_decl));
1871 tree arg = TREE_VALUE (arglist);
1873 /* Strip off all nops for the sake of the comparison. This
1874 is not quite the same as STRIP_NOPS. It does more.
1875 We must also strip off INDIRECT_EXPR for C++ reference
1877 while (TREE_CODE (arg) == NOP_EXPR
1878 || TREE_CODE (arg) == CONVERT_EXPR
1879 || TREE_CODE (arg) == NON_LVALUE_EXPR
1880 || TREE_CODE (arg) == INDIRECT_REF)
1881 arg = TREE_OPERAND (arg, 0);
1882 if (arg != last_parm)
1883 warning ("second parameter of `va_start' not last named argument");
1885 else if (! current_function_varargs)
1886 /* Evidently an out of date version of <stdarg.h>; can't validate
1887 va_start's second argument, but can still work as intended. */
1888 warning ("`__builtin_next_arg' called without an argument");
1890 return expand_binop (Pmode, add_optab,
1891 current_function_internal_arg_pointer,
1892 current_function_arg_offset_rtx,
1893 NULL_RTX, 0, OPTAB_LIB_WIDEN);
1896 /* Make it easier for the backends by protecting the valist argument
1897 from multiple evaluations. */
1900 stabilize_va_list (valist, needs_lvalue)
1904 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
1906 if (TREE_SIDE_EFFECTS (valist))
1907 valist = save_expr (valist);
1909 /* For this case, the backends will be expecting a pointer to
1910 TREE_TYPE (va_list_type_node), but it's possible we've
1911 actually been given an array (an actual va_list_type_node).
1913 if (TREE_CODE (TREE_TYPE (valist)) == ARRAY_TYPE)
1915 tree p1 = build_pointer_type (TREE_TYPE (va_list_type_node));
1916 tree p2 = build_pointer_type (va_list_type_node);
1918 valist = build1 (ADDR_EXPR, p2, valist);
1919 valist = fold (build1 (NOP_EXPR, p1, valist));
1928 if (! TREE_SIDE_EFFECTS (valist))
1931 pt = build_pointer_type (va_list_type_node);
1932 valist = fold (build1 (ADDR_EXPR, pt, valist));
1933 TREE_SIDE_EFFECTS (valist) = 1;
1936 if (TREE_SIDE_EFFECTS (valist))
1937 valist = save_expr (valist);
1938 valist = fold (build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (valist)),
1945 /* The "standard" implementation of va_start: just assign `nextarg' to
1948 std_expand_builtin_va_start (stdarg_p, valist, nextarg)
1949 int stdarg_p ATTRIBUTE_UNUSED;
1956 nextarg = plus_constant (nextarg, -UNITS_PER_WORD);
1958 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
1959 make_tree (ptr_type_node, nextarg));
1960 TREE_SIDE_EFFECTS (t) = 1;
1962 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
1965 /* Expand ARGLIST, which from a call to __builtin_stdarg_va_start or
1966 __builtin_varargs_va_start, depending on STDARG_P. */
1968 expand_builtin_va_start (stdarg_p, arglist)
1973 tree chain = arglist, valist;
1976 nextarg = expand_builtin_next_arg (chain = TREE_CHAIN (arglist));
1978 nextarg = expand_builtin_next_arg (NULL_TREE);
1980 if (TREE_CHAIN (chain))
1981 error ("too many arguments to function `va_start'");
1983 valist = stabilize_va_list (TREE_VALUE (arglist), 1);
1985 #ifdef EXPAND_BUILTIN_VA_START
1986 EXPAND_BUILTIN_VA_START (stdarg_p, valist, nextarg);
1988 std_expand_builtin_va_start (stdarg_p, valist, nextarg);
1994 /* Allocate an alias set for use in storing and reading from the varargs
1997 get_varargs_alias_set ()
1999 static int set = -1;
2001 set = new_alias_set ();
2005 /* The "standard" implementation of va_arg: read the value from the
2006 current (padded) address and increment by the (padded) size. */
2008 std_expand_builtin_va_arg (valist, type)
2012 HOST_WIDE_INT align;
2013 HOST_WIDE_INT rounded_size;
2016 /* Compute the rounded size of the type. */
2017 align = PARM_BOUNDARY / BITS_PER_UNIT;
2018 rounded_size = (((int_size_in_bytes (type) + align - 1) / align) * align);
2022 if (PAD_VARARGS_DOWN)
2024 /* Small args are padded downward. */
2027 adj = TREE_INT_CST_LOW (TYPE_SIZE (type)) / BITS_PER_UNIT;
2028 if (rounded_size > align)
2031 addr_tree = build (PLUS_EXPR, TREE_TYPE (addr_tree), addr_tree,
2032 build_int_2 (rounded_size - adj, 0));
2035 addr = expand_expr (addr_tree, NULL_RTX, Pmode, EXPAND_NORMAL);
2036 addr = copy_to_reg (addr);
2038 /* Compute new value for AP. */
2039 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
2040 build (PLUS_EXPR, TREE_TYPE (valist), valist,
2041 build_int_2 (rounded_size, 0)));
2042 TREE_SIDE_EFFECTS (t) = 1;
2043 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2048 /* Expand __builtin_va_arg, which is not really a builtin function, but
2049 a very special sort of operator. */
2051 expand_builtin_va_arg (valist, type)
2055 tree promoted_type, want_va_type, have_va_type;
2057 /* Verify that valist is of the proper type. */
2059 want_va_type = va_list_type_node;
2060 have_va_type = TREE_TYPE (valist);
2061 if (TREE_CODE (want_va_type) == ARRAY_TYPE)
2063 /* If va_list is an array type, the argument may have decayed
2064 to a pointer type, e.g. by being passed to another function.
2065 In that case, unwrap both types so that we can compare the
2066 underlying records. */
2067 if (TREE_CODE (have_va_type) == ARRAY_TYPE
2068 || TREE_CODE (have_va_type) == POINTER_TYPE)
2070 want_va_type = TREE_TYPE (want_va_type);
2071 have_va_type = TREE_TYPE (have_va_type);
2074 if (TYPE_MAIN_VARIANT (want_va_type) != TYPE_MAIN_VARIANT (have_va_type))
2076 error ("first argument to `va_arg' not of type `va_list'");
2080 /* Generate a diagnostic for requesting data of a type that cannot
2081 be passed through `...' due to type promotion at the call site. */
2082 else if ((promoted_type = (*lang_type_promotes_to) (type)) != NULL_TREE)
2084 const char *name = "<anonymous type>", *pname = 0;
2085 static int gave_help;
2087 if (TYPE_NAME (type))
2089 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
2090 name = IDENTIFIER_POINTER (TYPE_NAME (type));
2091 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
2092 && DECL_NAME (TYPE_NAME (type)))
2093 name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
2095 if (TYPE_NAME (promoted_type))
2097 if (TREE_CODE (TYPE_NAME (promoted_type)) == IDENTIFIER_NODE)
2098 pname = IDENTIFIER_POINTER (TYPE_NAME (promoted_type));
2099 else if (TREE_CODE (TYPE_NAME (promoted_type)) == TYPE_DECL
2100 && DECL_NAME (TYPE_NAME (promoted_type)))
2101 pname = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (promoted_type)));
2104 error ("`%s' is promoted to `%s' when passed through `...'", name, pname);
2108 error ("(so you should pass `%s' not `%s' to `va_arg')", pname, name);
2115 /* Make it easier for the backends by protecting the valist argument
2116 from multiple evaluations. */
2117 valist = stabilize_va_list (valist, 0);
2119 #ifdef EXPAND_BUILTIN_VA_ARG
2120 addr = EXPAND_BUILTIN_VA_ARG (valist, type);
2122 addr = std_expand_builtin_va_arg (valist, type);
2126 result = gen_rtx_MEM (TYPE_MODE (type), addr);
2127 MEM_ALIAS_SET (result) = get_varargs_alias_set ();
2132 /* Expand ARGLIST, from a call to __builtin_va_end. */
2134 expand_builtin_va_end (arglist)
2137 tree valist = TREE_VALUE (arglist);
2139 #ifdef EXPAND_BUILTIN_VA_END
2140 valist = stabilize_va_list (valist, 0);
2141 EXPAND_BUILTIN_VA_END(arglist);
2143 /* Evaluate for side effects, if needed. I hate macros that don't
2145 if (TREE_SIDE_EFFECTS (valist))
2146 expand_expr (valist, const0_rtx, VOIDmode, EXPAND_NORMAL);
2152 /* Expand ARGLIST, from a call to __builtin_va_copy. We do this as a
2153 builtin rather than just as an assignment in stdarg.h because of the
2154 nastiness of array-type va_list types. */
2156 expand_builtin_va_copy (arglist)
2161 dst = TREE_VALUE (arglist);
2162 src = TREE_VALUE (TREE_CHAIN (arglist));
2164 dst = stabilize_va_list (dst, 1);
2165 src = stabilize_va_list (src, 0);
2167 if (TREE_CODE (va_list_type_node) != ARRAY_TYPE)
2169 t = build (MODIFY_EXPR, va_list_type_node, dst, src);
2170 TREE_SIDE_EFFECTS (t) = 1;
2171 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2175 rtx dstb, srcb, size;
2177 /* Evaluate to pointers. */
2178 dstb = expand_expr (dst, NULL_RTX, Pmode, EXPAND_NORMAL);
2179 srcb = expand_expr (src, NULL_RTX, Pmode, EXPAND_NORMAL);
2180 size = expand_expr (TYPE_SIZE_UNIT (va_list_type_node), NULL_RTX,
2181 VOIDmode, EXPAND_NORMAL);
2183 /* "Dereference" to BLKmode memories. */
2184 dstb = gen_rtx_MEM (BLKmode, dstb);
2185 MEM_ALIAS_SET (dstb) = get_alias_set (TREE_TYPE (TREE_TYPE (dst)));
2186 srcb = gen_rtx_MEM (BLKmode, srcb);
2187 MEM_ALIAS_SET (srcb) = get_alias_set (TREE_TYPE (TREE_TYPE (src)));
2190 emit_block_move (dstb, srcb, size, TYPE_ALIGN (va_list_type_node));
2196 /* Expand a call to one of the builtin functions __builtin_frame_address or
2197 __builtin_return_address. */
2199 expand_builtin_frame_address (exp)
2202 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
2203 tree arglist = TREE_OPERAND (exp, 1);
2205 /* The argument must be a nonnegative integer constant.
2206 It counts the number of frames to scan up the stack.
2207 The value is the return address saved in that frame. */
2209 /* Warning about missing arg was already issued. */
2211 else if (TREE_CODE (TREE_VALUE (arglist)) != INTEGER_CST
2212 || tree_int_cst_sgn (TREE_VALUE (arglist)) < 0)
2214 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
2215 error ("invalid arg to `__builtin_frame_address'");
2217 error ("invalid arg to `__builtin_return_address'");
2222 rtx tem = expand_builtin_return_addr (DECL_FUNCTION_CODE (fndecl),
2223 TREE_INT_CST_LOW (TREE_VALUE (arglist)),
2224 hard_frame_pointer_rtx);
2226 /* Some ports cannot access arbitrary stack frames. */
2229 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
2230 warning ("unsupported arg to `__builtin_frame_address'");
2232 warning ("unsupported arg to `__builtin_return_address'");
2236 /* For __builtin_frame_address, return what we've got. */
2237 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
2240 if (GET_CODE (tem) != REG
2241 && ! CONSTANT_P (tem))
2242 tem = copy_to_mode_reg (Pmode, tem);
2247 /* Expand a call to the alloca builtin, with arguments ARGLIST. Return 0 if
2248 we failed and the caller should emit a normal call, otherwise try to get
2249 the result in TARGET, if convenient. */
2251 expand_builtin_alloca (arglist, target)
2258 /* Arg could be non-integer if user redeclared this fcn wrong. */
2259 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != INTEGER_TYPE)
2262 /* Compute the argument. */
2263 op0 = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
2265 /* Allocate the desired space. */
2266 return allocate_dynamic_stack_space (op0, target, BITS_PER_UNIT);
2269 /* Expand a call to the ffs builtin. The arguments are in ARGLIST.
2270 Return 0 if a normal call should be emitted rather than expanding the
2271 function in-line. If convenient, the result should be placed in TARGET.
2272 SUBTARGET may be used as the target for computing one of EXP's operands. */
2274 expand_builtin_ffs (arglist, target, subtarget)
2276 rtx target, subtarget;
2280 /* Arg could be non-integer if user redeclared this fcn wrong. */
2281 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != INTEGER_TYPE)
2284 /* Compute the argument. */
2285 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
2286 /* Compute ffs, into TARGET if possible.
2287 Set TARGET to wherever the result comes back. */
2288 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
2289 ffs_optab, op0, target, 1);
2295 /* Expand an expression EXP that calls a built-in function,
2296 with result going to TARGET if that's convenient
2297 (and in mode MODE if that's convenient).
2298 SUBTARGET may be used as the target for computing one of EXP's operands.
2299 IGNORE is nonzero if the value is to be ignored. */
2302 expand_builtin (exp, target, subtarget, mode, ignore)
2306 enum machine_mode mode;
2309 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
2310 tree arglist = TREE_OPERAND (exp, 1);
2311 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
2313 #ifdef MD_EXPAND_BUILTIN
2314 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
2315 return MD_EXPAND_BUILTIN (exp, target, subtarget, mode, ignore);
2318 /* When not optimizing, generate calls to library functions for a certain
2320 if (! optimize && ! CALLED_AS_BUILT_IN (fndecl)
2321 && (fcode == BUILT_IN_SIN || fcode == BUILT_IN_COS
2322 || fcode == BUILT_IN_FSQRT || fcode == BUILT_IN_MEMSET
2323 || fcode == BUILT_IN_MEMCPY || fcode == BUILT_IN_MEMCMP
2324 || fcode == BUILT_IN_BCMP || fcode == BUILT_IN_BZERO
2325 || fcode == BUILT_IN_STRLEN || fcode == BUILT_IN_STRCPY
2326 || fcode == BUILT_IN_STRCMP || fcode == BUILT_IN_FFS))
2327 return expand_call (exp, target, ignore);
2334 /* build_function_call changes these into ABS_EXPR. */
2339 /* Treat these like sqrt, but only if the user asks for them. */
2340 if (! flag_fast_math)
2342 case BUILT_IN_FSQRT:
2343 target = expand_builtin_mathfn (exp, target, subtarget);
2351 case BUILT_IN_APPLY_ARGS:
2352 return expand_builtin_apply_args ();
2354 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
2355 FUNCTION with a copy of the parameters described by
2356 ARGUMENTS, and ARGSIZE. It returns a block of memory
2357 allocated on the stack into which is stored all the registers
2358 that might possibly be used for returning the result of a
2359 function. ARGUMENTS is the value returned by
2360 __builtin_apply_args. ARGSIZE is the number of bytes of
2361 arguments that must be copied. ??? How should this value be
2362 computed? We'll also need a safe worst case value for varargs
2364 case BUILT_IN_APPLY:
2366 /* Arg could be non-pointer if user redeclared this fcn wrong. */
2367 || ! POINTER_TYPE_P (TREE_TYPE (TREE_VALUE (arglist)))
2368 || TREE_CHAIN (arglist) == 0
2369 || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) != POINTER_TYPE
2370 || TREE_CHAIN (TREE_CHAIN (arglist)) == 0
2371 || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))))) != INTEGER_TYPE)
2379 for (t = arglist, i = 0; t; t = TREE_CHAIN (t), i++)
2380 ops[i] = expand_expr (TREE_VALUE (t), NULL_RTX, VOIDmode, 0);
2382 return expand_builtin_apply (ops[0], ops[1], ops[2]);
2385 /* __builtin_return (RESULT) causes the function to return the
2386 value described by RESULT. RESULT is address of the block of
2387 memory returned by __builtin_apply. */
2388 case BUILT_IN_RETURN:
2390 /* Arg could be non-pointer if user redeclared this fcn wrong. */
2391 && TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) == POINTER_TYPE)
2392 expand_builtin_return (expand_expr (TREE_VALUE (arglist),
2393 NULL_RTX, VOIDmode, 0));
2396 case BUILT_IN_SAVEREGS:
2397 return expand_builtin_saveregs ();
2399 case BUILT_IN_ARGS_INFO:
2400 return expand_builtin_args_info (exp);
2402 /* Return the address of the first anonymous stack arg. */
2403 case BUILT_IN_NEXT_ARG:
2404 return expand_builtin_next_arg (arglist);
2406 case BUILT_IN_CLASSIFY_TYPE:
2407 return expand_builtin_classify_type (arglist);
2409 case BUILT_IN_CONSTANT_P:
2410 return expand_builtin_constant_p (exp);
2412 case BUILT_IN_FRAME_ADDRESS:
2413 case BUILT_IN_RETURN_ADDRESS:
2414 return expand_builtin_frame_address (exp);
2416 /* Returns the address of the area where the structure is returned.
2418 case BUILT_IN_AGGREGATE_INCOMING_ADDRESS:
2420 || ! AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl)))
2421 || GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl))) != MEM)
2424 return XEXP (DECL_RTL (DECL_RESULT (current_function_decl)), 0);
2426 case BUILT_IN_ALLOCA:
2427 target = expand_builtin_alloca (arglist, target);
2433 target = expand_builtin_ffs (arglist, target, subtarget);
2438 case BUILT_IN_STRLEN:
2439 target = expand_builtin_strlen (exp, target, mode);
2444 case BUILT_IN_STRCPY:
2445 target = expand_builtin_strcpy (exp);
2450 case BUILT_IN_MEMCPY:
2451 target = expand_builtin_memcpy (arglist);
2456 case BUILT_IN_MEMSET:
2457 target = expand_builtin_memset (exp);
2462 case BUILT_IN_BZERO:
2463 target = expand_builtin_bzero (exp);
2468 /* These comparison functions need an instruction that returns an actual
2469 index. An ordinary compare that just sets the condition codes
2471 #ifdef HAVE_cmpstrsi
2472 case BUILT_IN_STRCMP:
2473 target = expand_builtin_strcmp (exp, target);
2479 case BUILT_IN_MEMCMP:
2480 target = expand_builtin_memcmp (exp, arglist, target);
2485 case BUILT_IN_STRCMP:
2487 case BUILT_IN_MEMCMP:
2491 case BUILT_IN_SETJMP:
2493 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE)
2497 rtx buf_addr = expand_expr (TREE_VALUE (arglist), subtarget,
2499 rtx lab = gen_label_rtx ();
2500 rtx ret = expand_builtin_setjmp (buf_addr, target, lab, lab);
2505 /* __builtin_longjmp is passed a pointer to an array of five words.
2506 It's similar to the C library longjmp function but works with
2507 __builtin_setjmp above. */
2508 case BUILT_IN_LONGJMP:
2509 if (arglist == 0 || TREE_CHAIN (arglist) == 0
2510 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE)
2514 rtx buf_addr = expand_expr (TREE_VALUE (arglist), subtarget,
2516 rtx value = expand_expr (TREE_VALUE (TREE_CHAIN (arglist)),
2517 NULL_RTX, VOIDmode, 0);
2519 if (value != const1_rtx)
2521 error ("__builtin_longjmp second argument must be 1");
2525 expand_builtin_longjmp (buf_addr, value);
2532 emit_insn (gen_trap ());
2535 error ("__builtin_trap not supported by this target");
2539 /* Various hooks for the DWARF 2 __throw routine. */
2540 case BUILT_IN_UNWIND_INIT:
2541 expand_builtin_unwind_init ();
2543 case BUILT_IN_DWARF_CFA:
2544 return virtual_cfa_rtx;
2545 #ifdef DWARF2_UNWIND_INFO
2546 case BUILT_IN_DWARF_FP_REGNUM:
2547 return expand_builtin_dwarf_fp_regnum ();
2548 case BUILT_IN_INIT_DWARF_REG_SIZES:
2549 expand_builtin_init_dwarf_reg_sizes (TREE_VALUE (arglist));
2552 case BUILT_IN_FROB_RETURN_ADDR:
2553 return expand_builtin_frob_return_addr (TREE_VALUE (arglist));
2554 case BUILT_IN_EXTRACT_RETURN_ADDR:
2555 return expand_builtin_extract_return_addr (TREE_VALUE (arglist));
2556 case BUILT_IN_EH_RETURN:
2557 expand_builtin_eh_return (TREE_VALUE (arglist),
2558 TREE_VALUE (TREE_CHAIN (arglist)),
2559 TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))));
2561 case BUILT_IN_VARARGS_START:
2562 return expand_builtin_va_start (0, arglist);
2563 case BUILT_IN_STDARG_START:
2564 return expand_builtin_va_start (1, arglist);
2565 case BUILT_IN_VA_END:
2566 return expand_builtin_va_end (arglist);
2567 case BUILT_IN_VA_COPY:
2568 return expand_builtin_va_copy (arglist);
2570 default: /* just do library call, if unknown builtin */
2571 error ("built-in function `%s' not currently supported",
2572 IDENTIFIER_POINTER (DECL_NAME (fndecl)));
2575 /* The switch statement above can drop through to cause the function
2576 to be called normally. */
2577 return expand_call (exp, target, ignore);