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));
106 static rtx expand_builtin_expect PARAMS ((tree, rtx));
108 /* Return the alignment in bits of EXP, a pointer valued expression.
109 But don't return more than MAX_ALIGN no matter what.
110 The alignment returned is, by default, the alignment of the thing that
111 EXP points to (if it is not a POINTER_TYPE, 0 is returned).
113 Otherwise, look at the expression to see if we can do better, i.e., if the
114 expression is actually pointing at an object whose alignment is tighter. */
117 get_pointer_alignment (exp, max_align)
121 unsigned align, inner;
123 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
126 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
127 align = MIN (align, max_align);
131 switch (TREE_CODE (exp))
135 case NON_LVALUE_EXPR:
136 exp = TREE_OPERAND (exp, 0);
137 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
140 inner = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
141 align = MIN (inner, max_align);
145 /* If sum of pointer + int, restrict our maximum alignment to that
146 imposed by the integer. If not, we can't do any better than
148 if (! host_integerp (TREE_OPERAND (exp, 1), 1))
151 while (((tree_low_cst (TREE_OPERAND (exp, 1), 1) * BITS_PER_UNIT)
156 exp = TREE_OPERAND (exp, 0);
160 /* See what we are pointing at and look at its alignment. */
161 exp = TREE_OPERAND (exp, 0);
162 if (TREE_CODE (exp) == FUNCTION_DECL)
163 align = FUNCTION_BOUNDARY;
164 else if (DECL_P (exp))
165 align = DECL_ALIGN (exp);
166 #ifdef CONSTANT_ALIGNMENT
167 else if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'c')
168 align = CONSTANT_ALIGNMENT (exp, align);
170 return MIN (align, max_align);
178 /* Compute the length of a C string. TREE_STRING_LENGTH is not the right
179 way, because it could contain a zero byte in the middle.
180 TREE_STRING_LENGTH is the size of the character array, not the string.
182 The value returned is of type `ssizetype'.
184 Unfortunately, string_constant can't access the values of const char
185 arrays with initializers, so neither can we do so here. */
195 src = string_constant (src, &offset_node);
199 max = TREE_STRING_LENGTH (src);
200 ptr = TREE_STRING_POINTER (src);
202 if (offset_node && TREE_CODE (offset_node) != INTEGER_CST)
204 /* If the string has an internal zero byte (e.g., "foo\0bar"), we can't
205 compute the offset to the following null if we don't know where to
206 start searching for it. */
209 for (i = 0; i < max; i++)
213 /* We don't know the starting offset, but we do know that the string
214 has no internal zero bytes. We can assume that the offset falls
215 within the bounds of the string; otherwise, the programmer deserves
216 what he gets. Subtract the offset from the length of the string,
217 and return that. This would perhaps not be valid if we were dealing
218 with named arrays in addition to literal string constants. */
220 return size_diffop (size_int (max), offset_node);
223 /* We have a known offset into the string. Start searching there for
225 if (offset_node == 0)
229 /* Did we get a long long offset? If so, punt. */
230 if (TREE_INT_CST_HIGH (offset_node) != 0)
232 offset = TREE_INT_CST_LOW (offset_node);
235 /* If the offset is known to be out of bounds, warn, and call strlen at
237 if (offset < 0 || offset > max)
239 warning ("offset outside bounds of constant string");
243 /* Use strlen to search for the first zero byte. Since any strings
244 constructed with build_string will have nulls appended, we win even
245 if we get handed something like (char[4])"abcd".
247 Since OFFSET is our starting index into the string, no further
248 calculation is needed. */
249 return ssize_int (strlen (ptr + offset));
252 /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
253 times to get the address of either a higher stack frame, or a return
254 address located within it (depending on FNDECL_CODE). */
257 expand_builtin_return_addr (fndecl_code, count, tem)
258 enum built_in_function fndecl_code;
264 /* Some machines need special handling before we can access
265 arbitrary frames. For example, on the sparc, we must first flush
266 all register windows to the stack. */
267 #ifdef SETUP_FRAME_ADDRESSES
269 SETUP_FRAME_ADDRESSES ();
272 /* On the sparc, the return address is not in the frame, it is in a
273 register. There is no way to access it off of the current frame
274 pointer, but it can be accessed off the previous frame pointer by
275 reading the value from the register window save area. */
276 #ifdef RETURN_ADDR_IN_PREVIOUS_FRAME
277 if (fndecl_code == BUILT_IN_RETURN_ADDRESS)
281 /* Scan back COUNT frames to the specified frame. */
282 for (i = 0; i < count; i++)
284 /* Assume the dynamic chain pointer is in the word that the
285 frame address points to, unless otherwise specified. */
286 #ifdef DYNAMIC_CHAIN_ADDRESS
287 tem = DYNAMIC_CHAIN_ADDRESS (tem);
289 tem = memory_address (Pmode, tem);
290 tem = copy_to_reg (gen_rtx_MEM (Pmode, tem));
291 MEM_ALIAS_SET (tem) = get_frame_alias_set ();
294 /* For __builtin_frame_address, return what we've got. */
295 if (fndecl_code == BUILT_IN_FRAME_ADDRESS)
298 /* For __builtin_return_address, Get the return address from that
300 #ifdef RETURN_ADDR_RTX
301 tem = RETURN_ADDR_RTX (count, tem);
303 tem = memory_address (Pmode,
304 plus_constant (tem, GET_MODE_SIZE (Pmode)));
305 tem = gen_rtx_MEM (Pmode, tem);
306 MEM_ALIAS_SET (tem) = get_frame_alias_set ();
311 /* Alias set used for setjmp buffer. */
312 static HOST_WIDE_INT setjmp_alias_set = -1;
314 /* __builtin_setjmp is passed a pointer to an array of five words (not
315 all will be used on all machines). It operates similarly to the C
316 library function of the same name, but is more efficient. Much of
317 the code below (and for longjmp) is copied from the handling of
320 NOTE: This is intended for use by GNAT and the exception handling
321 scheme in the compiler and will only work in the method used by
325 expand_builtin_setjmp (buf_addr, target, first_label, next_label)
328 rtx first_label, next_label;
330 rtx lab1 = gen_label_rtx ();
331 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
332 enum machine_mode value_mode;
336 value_mode = TYPE_MODE (integer_type_node);
338 if (setjmp_alias_set == -1)
339 setjmp_alias_set = new_alias_set ();
341 #ifdef POINTERS_EXTEND_UNSIGNED
342 buf_addr = convert_memory_address (Pmode, buf_addr);
345 buf_addr = force_reg (Pmode, force_operand (buf_addr, NULL_RTX));
347 if (target == 0 || GET_CODE (target) != REG
348 || REGNO (target) < FIRST_PSEUDO_REGISTER)
349 target = gen_reg_rtx (value_mode);
353 /* We store the frame pointer and the address of lab1 in the buffer
354 and use the rest of it for the stack save area, which is
355 machine-dependent. */
357 #ifndef BUILTIN_SETJMP_FRAME_VALUE
358 #define BUILTIN_SETJMP_FRAME_VALUE virtual_stack_vars_rtx
361 mem = gen_rtx_MEM (Pmode, buf_addr);
362 MEM_ALIAS_SET (mem) = setjmp_alias_set;
363 emit_move_insn (mem, BUILTIN_SETJMP_FRAME_VALUE);
365 mem = gen_rtx_MEM (Pmode, plus_constant (buf_addr, GET_MODE_SIZE (Pmode))),
366 MEM_ALIAS_SET (mem) = setjmp_alias_set;
368 emit_move_insn (validize_mem (mem),
369 force_reg (Pmode, gen_rtx_LABEL_REF (Pmode, lab1)));
371 stack_save = gen_rtx_MEM (sa_mode,
372 plus_constant (buf_addr,
373 2 * GET_MODE_SIZE (Pmode)));
374 MEM_ALIAS_SET (stack_save) = setjmp_alias_set;
375 emit_stack_save (SAVE_NONLOCAL, &stack_save, NULL_RTX);
377 /* If there is further processing to do, do it. */
378 #ifdef HAVE_builtin_setjmp_setup
379 if (HAVE_builtin_setjmp_setup)
380 emit_insn (gen_builtin_setjmp_setup (buf_addr));
383 /* Set TARGET to zero and branch to the first-time-through label. */
384 emit_move_insn (target, const0_rtx);
385 emit_jump_insn (gen_jump (first_label));
389 /* Tell flow about the strange goings on. Putting `lab1' on
390 `nonlocal_goto_handler_labels' to indicates that function
391 calls may traverse the arc back to this label. */
393 current_function_has_nonlocal_label = 1;
394 nonlocal_goto_handler_labels
395 = gen_rtx_EXPR_LIST (VOIDmode, lab1, nonlocal_goto_handler_labels);
397 /* Clobber the FP when we get here, so we have to make sure it's
398 marked as used by this function. */
399 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
401 /* Mark the static chain as clobbered here so life information
402 doesn't get messed up for it. */
403 emit_insn (gen_rtx_CLOBBER (VOIDmode, static_chain_rtx));
405 /* Now put in the code to restore the frame pointer, and argument
406 pointer, if needed. The code below is from expand_end_bindings
407 in stmt.c; see detailed documentation there. */
408 #ifdef HAVE_nonlocal_goto
409 if (! HAVE_nonlocal_goto)
411 emit_move_insn (virtual_stack_vars_rtx, hard_frame_pointer_rtx);
413 #if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
414 if (fixed_regs[ARG_POINTER_REGNUM])
416 #ifdef ELIMINABLE_REGS
418 static struct elims {int from, to;} elim_regs[] = ELIMINABLE_REGS;
420 for (i = 0; i < sizeof elim_regs / sizeof elim_regs[0]; i++)
421 if (elim_regs[i].from == ARG_POINTER_REGNUM
422 && elim_regs[i].to == HARD_FRAME_POINTER_REGNUM)
425 if (i == sizeof elim_regs / sizeof elim_regs [0])
428 /* Now restore our arg pointer from the address at which it
429 was saved in our stack frame.
430 If there hasn't be space allocated for it yet, make
432 if (arg_pointer_save_area == 0)
433 arg_pointer_save_area
434 = assign_stack_local (Pmode, GET_MODE_SIZE (Pmode), 0);
435 emit_move_insn (virtual_incoming_args_rtx,
436 copy_to_reg (arg_pointer_save_area));
441 #ifdef HAVE_builtin_setjmp_receiver
442 if (HAVE_builtin_setjmp_receiver)
443 emit_insn (gen_builtin_setjmp_receiver (lab1));
446 #ifdef HAVE_nonlocal_goto_receiver
447 if (HAVE_nonlocal_goto_receiver)
448 emit_insn (gen_nonlocal_goto_receiver ());
455 /* Set TARGET, and branch to the next-time-through label. */
456 emit_move_insn (target, const1_rtx);
457 emit_jump_insn (gen_jump (next_label));
463 /* __builtin_longjmp is passed a pointer to an array of five words (not
464 all will be used on all machines). It operates similarly to the C
465 library function of the same name, but is more efficient. Much of
466 the code below is copied from the handling of non-local gotos.
468 NOTE: This is intended for use by GNAT and the exception handling
469 scheme in the compiler and will only work in the method used by
473 expand_builtin_longjmp (buf_addr, value)
477 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
479 if (setjmp_alias_set == -1)
480 setjmp_alias_set = new_alias_set ();
482 #ifdef POINTERS_EXTEND_UNSIGNED
483 buf_addr = convert_memory_address (Pmode, buf_addr);
485 buf_addr = force_reg (Pmode, buf_addr);
487 /* We used to store value in static_chain_rtx, but that fails if pointers
488 are smaller than integers. We instead require that the user must pass
489 a second argument of 1, because that is what builtin_setjmp will
490 return. This also makes EH slightly more efficient, since we are no
491 longer copying around a value that we don't care about. */
492 if (value != const1_rtx)
495 #ifdef HAVE_builtin_longjmp
496 if (HAVE_builtin_longjmp)
497 emit_insn (gen_builtin_longjmp (buf_addr));
501 fp = gen_rtx_MEM (Pmode, buf_addr);
502 lab = gen_rtx_MEM (Pmode, plus_constant (buf_addr,
503 GET_MODE_SIZE (Pmode)));
505 stack = gen_rtx_MEM (sa_mode, plus_constant (buf_addr,
506 2 * GET_MODE_SIZE (Pmode)));
507 MEM_ALIAS_SET (fp) = MEM_ALIAS_SET (lab) = MEM_ALIAS_SET (stack)
510 /* Pick up FP, label, and SP from the block and jump. This code is
511 from expand_goto in stmt.c; see there for detailed comments. */
512 #if HAVE_nonlocal_goto
513 if (HAVE_nonlocal_goto)
514 /* We have to pass a value to the nonlocal_goto pattern that will
515 get copied into the static_chain pointer, but it does not matter
516 what that value is, because builtin_setjmp does not use it. */
517 emit_insn (gen_nonlocal_goto (value, fp, stack, lab));
521 lab = copy_to_reg (lab);
523 emit_move_insn (hard_frame_pointer_rtx, fp);
524 emit_stack_restore (SAVE_NONLOCAL, stack, NULL_RTX);
526 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
527 emit_insn (gen_rtx_USE (VOIDmode, stack_pointer_rtx));
528 emit_indirect_jump (lab);
533 /* Get a MEM rtx for expression EXP which is the address of an operand
534 to be used to be used in a string instruction (cmpstrsi, movstrsi, ..). */
540 rtx mem = gen_rtx_MEM (BLKmode,
541 memory_address (BLKmode,
542 expand_expr (exp, NULL_RTX,
543 ptr_mode, EXPAND_SUM)));
545 /* Get an expression we can use to find the attributes to assign to MEM.
546 If it is an ADDR_EXPR, use the operand. Otherwise, dereference it if
547 we can. First remove any nops. */
548 while ((TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
549 || TREE_CODE (exp) == NON_LVALUE_EXPR)
550 && POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (exp, 0))))
551 exp = TREE_OPERAND (exp, 0);
553 if (TREE_CODE (exp) == ADDR_EXPR)
554 exp = TREE_OPERAND (exp, 0);
555 else if (POINTER_TYPE_P (TREE_TYPE (exp)))
556 exp = build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (exp)), exp);
560 set_mem_attributes (mem, exp, 0);
562 /* memcpy, memset and other builtin stringops can alias with anything. */
563 MEM_ALIAS_SET (mem) = 0;
567 /* Built-in functions to perform an untyped call and return. */
569 /* For each register that may be used for calling a function, this
570 gives a mode used to copy the register's value. VOIDmode indicates
571 the register is not used for calling a function. If the machine
572 has register windows, this gives only the outbound registers.
573 INCOMING_REGNO gives the corresponding inbound register. */
574 static enum machine_mode apply_args_mode[FIRST_PSEUDO_REGISTER];
576 /* For each register that may be used for returning values, this gives
577 a mode used to copy the register's value. VOIDmode indicates the
578 register is not used for returning values. If the machine has
579 register windows, this gives only the outbound registers.
580 INCOMING_REGNO gives the corresponding inbound register. */
581 static enum machine_mode apply_result_mode[FIRST_PSEUDO_REGISTER];
583 /* For each register that may be used for calling a function, this
584 gives the offset of that register into the block returned by
585 __builtin_apply_args. 0 indicates that the register is not
586 used for calling a function. */
587 static int apply_args_reg_offset[FIRST_PSEUDO_REGISTER];
589 /* Return the offset of register REGNO into the block returned by
590 __builtin_apply_args. This is not declared static, since it is
591 needed in objc-act.c. */
594 apply_args_register_offset (regno)
599 /* Arguments are always put in outgoing registers (in the argument
600 block) if such make sense. */
601 #ifdef OUTGOING_REGNO
602 regno = OUTGOING_REGNO(regno);
604 return apply_args_reg_offset[regno];
607 /* Return the size required for the block returned by __builtin_apply_args,
608 and initialize apply_args_mode. */
613 static int size = -1;
615 enum machine_mode mode;
617 /* The values computed by this function never change. */
620 /* The first value is the incoming arg-pointer. */
621 size = GET_MODE_SIZE (Pmode);
623 /* The second value is the structure value address unless this is
624 passed as an "invisible" first argument. */
625 if (struct_value_rtx)
626 size += GET_MODE_SIZE (Pmode);
628 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
629 if (FUNCTION_ARG_REGNO_P (regno))
631 /* Search for the proper mode for copying this register's
632 value. I'm not sure this is right, but it works so far. */
633 enum machine_mode best_mode = VOIDmode;
635 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
637 mode = GET_MODE_WIDER_MODE (mode))
638 if (HARD_REGNO_MODE_OK (regno, mode)
639 && HARD_REGNO_NREGS (regno, mode) == 1)
642 if (best_mode == VOIDmode)
643 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
645 mode = GET_MODE_WIDER_MODE (mode))
646 if (HARD_REGNO_MODE_OK (regno, mode)
647 && (mov_optab->handlers[(int) mode].insn_code
648 != CODE_FOR_nothing))
652 if (mode == VOIDmode)
655 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
656 if (size % align != 0)
657 size = CEIL (size, align) * align;
658 apply_args_reg_offset[regno] = size;
659 size += GET_MODE_SIZE (mode);
660 apply_args_mode[regno] = mode;
664 apply_args_mode[regno] = VOIDmode;
665 apply_args_reg_offset[regno] = 0;
671 /* Return the size required for the block returned by __builtin_apply,
672 and initialize apply_result_mode. */
677 static int size = -1;
679 enum machine_mode mode;
681 /* The values computed by this function never change. */
686 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
687 if (FUNCTION_VALUE_REGNO_P (regno))
689 /* Search for the proper mode for copying this register's
690 value. I'm not sure this is right, but it works so far. */
691 enum machine_mode best_mode = VOIDmode;
693 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
695 mode = GET_MODE_WIDER_MODE (mode))
696 if (HARD_REGNO_MODE_OK (regno, mode))
699 if (best_mode == VOIDmode)
700 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
702 mode = GET_MODE_WIDER_MODE (mode))
703 if (HARD_REGNO_MODE_OK (regno, mode)
704 && (mov_optab->handlers[(int) mode].insn_code
705 != CODE_FOR_nothing))
709 if (mode == VOIDmode)
712 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
713 if (size % align != 0)
714 size = CEIL (size, align) * align;
715 size += GET_MODE_SIZE (mode);
716 apply_result_mode[regno] = mode;
719 apply_result_mode[regno] = VOIDmode;
721 /* Allow targets that use untyped_call and untyped_return to override
722 the size so that machine-specific information can be stored here. */
723 #ifdef APPLY_RESULT_SIZE
724 size = APPLY_RESULT_SIZE;
730 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
731 /* Create a vector describing the result block RESULT. If SAVEP is true,
732 the result block is used to save the values; otherwise it is used to
733 restore the values. */
736 result_vector (savep, result)
740 int regno, size, align, nelts;
741 enum machine_mode mode;
743 rtx *savevec = (rtx *) alloca (FIRST_PSEUDO_REGISTER * sizeof (rtx));
746 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
747 if ((mode = apply_result_mode[regno]) != VOIDmode)
749 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
750 if (size % align != 0)
751 size = CEIL (size, align) * align;
752 reg = gen_rtx_REG (mode, savep ? regno : INCOMING_REGNO (regno));
753 mem = change_address (result, mode,
754 plus_constant (XEXP (result, 0), size));
755 savevec[nelts++] = (savep
756 ? gen_rtx_SET (VOIDmode, mem, reg)
757 : gen_rtx_SET (VOIDmode, reg, mem));
758 size += GET_MODE_SIZE (mode);
760 return gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (nelts, savevec));
762 #endif /* HAVE_untyped_call or HAVE_untyped_return */
764 /* Save the state required to perform an untyped call with the same
765 arguments as were passed to the current function. */
768 expand_builtin_apply_args_1 ()
771 int size, align, regno;
772 enum machine_mode mode;
774 /* Create a block where the arg-pointer, structure value address,
775 and argument registers can be saved. */
776 registers = assign_stack_local (BLKmode, apply_args_size (), -1);
778 /* Walk past the arg-pointer and structure value address. */
779 size = GET_MODE_SIZE (Pmode);
780 if (struct_value_rtx)
781 size += GET_MODE_SIZE (Pmode);
783 /* Save each register used in calling a function to the block. */
784 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
785 if ((mode = apply_args_mode[regno]) != VOIDmode)
789 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
790 if (size % align != 0)
791 size = CEIL (size, align) * align;
793 tem = gen_rtx_REG (mode, INCOMING_REGNO (regno));
795 emit_move_insn (change_address (registers, mode,
796 plus_constant (XEXP (registers, 0),
799 size += GET_MODE_SIZE (mode);
802 /* Save the arg pointer to the block. */
803 emit_move_insn (change_address (registers, Pmode, XEXP (registers, 0)),
804 copy_to_reg (virtual_incoming_args_rtx));
805 size = GET_MODE_SIZE (Pmode);
807 /* Save the structure value address unless this is passed as an
808 "invisible" first argument. */
809 if (struct_value_incoming_rtx)
811 emit_move_insn (change_address (registers, Pmode,
812 plus_constant (XEXP (registers, 0),
814 copy_to_reg (struct_value_incoming_rtx));
815 size += GET_MODE_SIZE (Pmode);
818 /* Return the address of the block. */
819 return copy_addr_to_reg (XEXP (registers, 0));
822 /* __builtin_apply_args returns block of memory allocated on
823 the stack into which is stored the arg pointer, structure
824 value address, static chain, and all the registers that might
825 possibly be used in performing a function call. The code is
826 moved to the start of the function so the incoming values are
829 expand_builtin_apply_args ()
831 /* Don't do __builtin_apply_args more than once in a function.
832 Save the result of the first call and reuse it. */
833 if (apply_args_value != 0)
834 return apply_args_value;
836 /* When this function is called, it means that registers must be
837 saved on entry to this function. So we migrate the
838 call to the first insn of this function. */
843 temp = expand_builtin_apply_args_1 ();
847 apply_args_value = temp;
849 /* Put the sequence after the NOTE that starts the function.
850 If this is inside a SEQUENCE, make the outer-level insn
851 chain current, so the code is placed at the start of the
853 push_topmost_sequence ();
854 emit_insns_before (seq, NEXT_INSN (get_insns ()));
855 pop_topmost_sequence ();
860 /* Perform an untyped call and save the state required to perform an
861 untyped return of whatever value was returned by the given function. */
864 expand_builtin_apply (function, arguments, argsize)
865 rtx function, arguments, argsize;
867 int size, align, regno;
868 enum machine_mode mode;
869 rtx incoming_args, result, reg, dest, call_insn;
870 rtx old_stack_level = 0;
873 /* Create a block where the return registers can be saved. */
874 result = assign_stack_local (BLKmode, apply_result_size (), -1);
876 /* Fetch the arg pointer from the ARGUMENTS block. */
877 incoming_args = gen_reg_rtx (Pmode);
878 emit_move_insn (incoming_args,
879 gen_rtx_MEM (Pmode, arguments));
880 #ifndef STACK_GROWS_DOWNWARD
881 incoming_args = expand_binop (Pmode, sub_optab, incoming_args, argsize,
882 incoming_args, 0, OPTAB_LIB_WIDEN);
885 /* Perform postincrements before actually calling the function. */
888 /* Push a new argument block and copy the arguments. */
889 do_pending_stack_adjust ();
891 /* Save the stack with nonlocal if available */
892 #ifdef HAVE_save_stack_nonlocal
893 if (HAVE_save_stack_nonlocal)
894 emit_stack_save (SAVE_NONLOCAL, &old_stack_level, NULL_RTX);
897 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
899 /* Push a block of memory onto the stack to store the memory arguments.
900 Save the address in a register, and copy the memory arguments. ??? I
901 haven't figured out how the calling convention macros effect this,
902 but it's likely that the source and/or destination addresses in
903 the block copy will need updating in machine specific ways. */
904 dest = allocate_dynamic_stack_space (argsize, 0, BITS_PER_UNIT);
905 emit_block_move (gen_rtx_MEM (BLKmode, dest),
906 gen_rtx_MEM (BLKmode, incoming_args),
907 argsize, PARM_BOUNDARY);
909 /* Refer to the argument block. */
911 arguments = gen_rtx_MEM (BLKmode, arguments);
913 /* Walk past the arg-pointer and structure value address. */
914 size = GET_MODE_SIZE (Pmode);
915 if (struct_value_rtx)
916 size += GET_MODE_SIZE (Pmode);
918 /* Restore each of the registers previously saved. Make USE insns
919 for each of these registers for use in making the call. */
920 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
921 if ((mode = apply_args_mode[regno]) != VOIDmode)
923 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
924 if (size % align != 0)
925 size = CEIL (size, align) * align;
926 reg = gen_rtx_REG (mode, regno);
928 change_address (arguments, mode,
929 plus_constant (XEXP (arguments, 0),
932 use_reg (&call_fusage, reg);
933 size += GET_MODE_SIZE (mode);
936 /* Restore the structure value address unless this is passed as an
937 "invisible" first argument. */
938 size = GET_MODE_SIZE (Pmode);
939 if (struct_value_rtx)
941 rtx value = gen_reg_rtx (Pmode);
942 emit_move_insn (value,
943 change_address (arguments, Pmode,
944 plus_constant (XEXP (arguments, 0),
946 emit_move_insn (struct_value_rtx, value);
947 if (GET_CODE (struct_value_rtx) == REG)
948 use_reg (&call_fusage, struct_value_rtx);
949 size += GET_MODE_SIZE (Pmode);
952 /* All arguments and registers used for the call are set up by now! */
953 function = prepare_call_address (function, NULL_TREE, &call_fusage, 0);
955 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
956 and we don't want to load it into a register as an optimization,
957 because prepare_call_address already did it if it should be done. */
958 if (GET_CODE (function) != SYMBOL_REF)
959 function = memory_address (FUNCTION_MODE, function);
961 /* Generate the actual call instruction and save the return value. */
962 #ifdef HAVE_untyped_call
963 if (HAVE_untyped_call)
964 emit_call_insn (gen_untyped_call (gen_rtx_MEM (FUNCTION_MODE, function),
965 result, result_vector (1, result)));
968 #ifdef HAVE_call_value
973 /* Locate the unique return register. It is not possible to
974 express a call that sets more than one return register using
975 call_value; use untyped_call for that. In fact, untyped_call
976 only needs to save the return registers in the given block. */
977 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
978 if ((mode = apply_result_mode[regno]) != VOIDmode)
981 abort (); /* HAVE_untyped_call required. */
982 valreg = gen_rtx_REG (mode, regno);
985 emit_call_insn (GEN_CALL_VALUE (valreg,
986 gen_rtx_MEM (FUNCTION_MODE, function),
987 const0_rtx, NULL_RTX, const0_rtx));
989 emit_move_insn (change_address (result, GET_MODE (valreg),
997 /* Find the CALL insn we just emitted. */
998 for (call_insn = get_last_insn ();
999 call_insn && GET_CODE (call_insn) != CALL_INSN;
1000 call_insn = PREV_INSN (call_insn))
1006 /* Put the register usage information on the CALL. If there is already
1007 some usage information, put ours at the end. */
1008 if (CALL_INSN_FUNCTION_USAGE (call_insn))
1012 for (link = CALL_INSN_FUNCTION_USAGE (call_insn); XEXP (link, 1) != 0;
1013 link = XEXP (link, 1))
1016 XEXP (link, 1) = call_fusage;
1019 CALL_INSN_FUNCTION_USAGE (call_insn) = call_fusage;
1021 /* Restore the stack. */
1022 #ifdef HAVE_save_stack_nonlocal
1023 if (HAVE_save_stack_nonlocal)
1024 emit_stack_restore (SAVE_NONLOCAL, old_stack_level, NULL_RTX);
1027 emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX);
1029 /* Return the address of the result block. */
1030 return copy_addr_to_reg (XEXP (result, 0));
1033 /* Perform an untyped return. */
1036 expand_builtin_return (result)
1039 int size, align, regno;
1040 enum machine_mode mode;
1042 rtx call_fusage = 0;
1044 apply_result_size ();
1045 result = gen_rtx_MEM (BLKmode, result);
1047 #ifdef HAVE_untyped_return
1048 if (HAVE_untyped_return)
1050 emit_jump_insn (gen_untyped_return (result, result_vector (0, result)));
1056 /* Restore the return value and note that each value is used. */
1058 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1059 if ((mode = apply_result_mode[regno]) != VOIDmode)
1061 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1062 if (size % align != 0)
1063 size = CEIL (size, align) * align;
1064 reg = gen_rtx_REG (mode, INCOMING_REGNO (regno));
1065 emit_move_insn (reg,
1066 change_address (result, mode,
1067 plus_constant (XEXP (result, 0),
1070 push_to_sequence (call_fusage);
1071 emit_insn (gen_rtx_USE (VOIDmode, reg));
1072 call_fusage = get_insns ();
1074 size += GET_MODE_SIZE (mode);
1077 /* Put the USE insns before the return. */
1078 emit_insns (call_fusage);
1080 /* Return whatever values was restored by jumping directly to the end
1082 expand_null_return ();
1085 /* Expand a call to __builtin_classify_type with arguments found in
1088 expand_builtin_classify_type (arglist)
1093 tree type = TREE_TYPE (TREE_VALUE (arglist));
1094 enum tree_code code = TREE_CODE (type);
1095 if (code == VOID_TYPE)
1096 return GEN_INT (void_type_class);
1097 if (code == INTEGER_TYPE)
1098 return GEN_INT (integer_type_class);
1099 if (code == CHAR_TYPE)
1100 return GEN_INT (char_type_class);
1101 if (code == ENUMERAL_TYPE)
1102 return GEN_INT (enumeral_type_class);
1103 if (code == BOOLEAN_TYPE)
1104 return GEN_INT (boolean_type_class);
1105 if (code == POINTER_TYPE)
1106 return GEN_INT (pointer_type_class);
1107 if (code == REFERENCE_TYPE)
1108 return GEN_INT (reference_type_class);
1109 if (code == OFFSET_TYPE)
1110 return GEN_INT (offset_type_class);
1111 if (code == REAL_TYPE)
1112 return GEN_INT (real_type_class);
1113 if (code == COMPLEX_TYPE)
1114 return GEN_INT (complex_type_class);
1115 if (code == FUNCTION_TYPE)
1116 return GEN_INT (function_type_class);
1117 if (code == METHOD_TYPE)
1118 return GEN_INT (method_type_class);
1119 if (code == RECORD_TYPE)
1120 return GEN_INT (record_type_class);
1121 if (code == UNION_TYPE || code == QUAL_UNION_TYPE)
1122 return GEN_INT (union_type_class);
1123 if (code == ARRAY_TYPE)
1125 if (TYPE_STRING_FLAG (type))
1126 return GEN_INT (string_type_class);
1128 return GEN_INT (array_type_class);
1130 if (code == SET_TYPE)
1131 return GEN_INT (set_type_class);
1132 if (code == FILE_TYPE)
1133 return GEN_INT (file_type_class);
1134 if (code == LANG_TYPE)
1135 return GEN_INT (lang_type_class);
1137 return GEN_INT (no_type_class);
1140 /* Expand expression EXP, which is a call to __builtin_constant_p. */
1142 expand_builtin_constant_p (exp)
1145 tree arglist = TREE_OPERAND (exp, 1);
1146 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1152 tree arg = TREE_VALUE (arglist);
1155 /* We return 1 for a numeric type that's known to be a constant
1156 value at compile-time or for an aggregate type that's a
1157 literal constant. */
1160 /* If we know this is a constant, emit the constant of one. */
1161 if (TREE_CODE_CLASS (TREE_CODE (arg)) == 'c'
1162 || (TREE_CODE (arg) == CONSTRUCTOR
1163 && TREE_CONSTANT (arg))
1164 || (TREE_CODE (arg) == ADDR_EXPR
1165 && TREE_CODE (TREE_OPERAND (arg, 0)) == STRING_CST))
1168 /* If we aren't going to be running CSE or this expression
1169 has side effects, show we don't know it to be a constant.
1170 Likewise if it's a pointer or aggregate type since in those
1171 case we only want literals, since those are only optimized
1172 when generating RTL, not later. */
1173 if (TREE_SIDE_EFFECTS (arg) || cse_not_expected
1174 || AGGREGATE_TYPE_P (TREE_TYPE (arg))
1175 || POINTER_TYPE_P (TREE_TYPE (arg)))
1178 /* Otherwise, emit (constant_p_rtx (ARG)) and let CSE get a
1179 chance to see if it can deduce whether ARG is constant. */
1181 tmp = expand_expr (arg, NULL_RTX, VOIDmode, 0);
1182 tmp = gen_rtx_CONSTANT_P_RTX (value_mode, tmp);
1187 /* Expand a call to one of the builtin math functions (sin, cos, or sqrt).
1188 Return 0 if a normal call should be emitted rather than expanding the
1189 function in-line. EXP is the expression that is a call to the builtin
1190 function; if convenient, the result should be placed in TARGET.
1191 SUBTARGET may be used as the target for computing one of EXP's operands. */
1193 expand_builtin_mathfn (exp, target, subtarget)
1195 rtx target, subtarget;
1197 optab builtin_optab;
1199 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
1200 tree arglist = TREE_OPERAND (exp, 1);
1203 /* Arg could be wrong type if user redeclared this fcn wrong. */
1204 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != REAL_TYPE)
1207 /* Stabilize and compute the argument. */
1208 if (TREE_CODE (TREE_VALUE (arglist)) != VAR_DECL
1209 && TREE_CODE (TREE_VALUE (arglist)) != PARM_DECL)
1211 exp = copy_node (exp);
1212 TREE_OPERAND (exp, 1) = arglist;
1213 /* Wrap the computation of the argument in a SAVE_EXPR. That
1214 way, if we need to expand the argument again (as in the
1215 flag_errno_math case below where we cannot directly set
1216 errno), we will not perform side-effects more than once.
1217 Note that here we're mutating the original EXP as well as the
1218 copy; that's the right thing to do in case the original EXP
1219 is expanded later. */
1220 TREE_VALUE (arglist) = save_expr (TREE_VALUE (arglist));
1221 arglist = copy_node (arglist);
1223 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
1225 /* Make a suitable register to place result in. */
1226 target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));
1231 switch (DECL_FUNCTION_CODE (fndecl))
1234 builtin_optab = sin_optab; break;
1236 builtin_optab = cos_optab; break;
1237 case BUILT_IN_FSQRT:
1238 builtin_optab = sqrt_optab; break;
1243 /* Compute into TARGET.
1244 Set TARGET to wherever the result comes back. */
1245 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
1246 builtin_optab, op0, target, 0);
1248 /* If we were unable to expand via the builtin, stop the
1249 sequence (without outputting the insns) and return 0, causing
1250 a call to the library function. */
1257 /* Check the results by default. But if flag_fast_math is turned on,
1258 then assume sqrt will always be called with valid arguments. */
1260 if (flag_errno_math && ! flag_fast_math)
1264 /* Don't define the builtin FP instructions
1265 if your machine is not IEEE. */
1266 if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT)
1269 lab1 = gen_label_rtx ();
1271 /* Test the result; if it is NaN, set errno=EDOM because
1272 the argument was not in the domain. */
1273 emit_cmp_and_jump_insns (target, target, EQ, 0, GET_MODE (target),
1278 #ifdef GEN_ERRNO_RTX
1279 rtx errno_rtx = GEN_ERRNO_RTX;
1282 = gen_rtx_MEM (word_mode, gen_rtx_SYMBOL_REF (Pmode, "errno"));
1285 emit_move_insn (errno_rtx, GEN_INT (TARGET_EDOM));
1288 /* We can't set errno=EDOM directly; let the library call do it.
1289 Pop the arguments right away in case the call gets deleted. */
1291 expand_call (exp, target, 0);
1298 /* Output the entire sequence. */
1299 insns = get_insns ();
1306 /* Expand expression EXP which is a call to the strlen builtin. Return 0
1307 if we failed the caller should emit a normal call, otherwise
1308 try to get the result in TARGET, if convenient (and in mode MODE if that's
1312 expand_builtin_strlen (exp, target, mode)
1315 enum machine_mode mode;
1317 tree arglist = TREE_OPERAND (exp, 1);
1318 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1321 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1322 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE)
1327 tree src = TREE_VALUE (arglist);
1328 tree len = c_strlen (src);
1331 = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1333 rtx result, src_reg, char_rtx, before_strlen;
1334 enum machine_mode insn_mode = value_mode, char_mode;
1335 enum insn_code icode = CODE_FOR_nothing;
1337 /* If the length is known, just return it. */
1339 return expand_expr (len, target, mode, EXPAND_MEMORY_USE_BAD);
1341 /* If SRC is not a pointer type, don't do this operation inline. */
1345 /* Bail out if we can't compute strlen in the right mode. */
1346 while (insn_mode != VOIDmode)
1348 icode = strlen_optab->handlers[(int) insn_mode].insn_code;
1349 if (icode != CODE_FOR_nothing)
1352 insn_mode = GET_MODE_WIDER_MODE (insn_mode);
1354 if (insn_mode == VOIDmode)
1357 /* Make a place to write the result of the instruction. */
1360 && GET_CODE (result) == REG
1361 && GET_MODE (result) == insn_mode
1362 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
1363 result = gen_reg_rtx (insn_mode);
1365 /* Make a place to hold the source address. We will not expand
1366 the actual source until we are sure that the expansion will
1367 not fail -- there are trees that cannot be expanded twice. */
1368 src_reg = gen_reg_rtx (Pmode);
1370 /* Mark the beginning of the strlen sequence so we can emit the
1371 source operand later. */
1372 before_strlen = get_last_insn();
1374 /* Check the string is readable and has an end. */
1375 if (current_function_check_memory_usage)
1376 emit_library_call (chkr_check_str_libfunc, 1, VOIDmode, 2,
1378 GEN_INT (MEMORY_USE_RO),
1379 TYPE_MODE (integer_type_node));
1381 char_rtx = const0_rtx;
1382 char_mode = insn_data[(int) icode].operand[2].mode;
1383 if (! (*insn_data[(int) icode].operand[2].predicate) (char_rtx,
1385 char_rtx = copy_to_mode_reg (char_mode, char_rtx);
1387 pat = GEN_FCN (icode) (result, gen_rtx_MEM (BLKmode, src_reg),
1388 char_rtx, GEN_INT (align));
1393 /* Now that we are assured of success, expand the source. */
1395 pat = memory_address (BLKmode,
1396 expand_expr (src, src_reg, ptr_mode, EXPAND_SUM));
1398 emit_move_insn (src_reg, pat);
1399 pat = gen_sequence ();
1403 emit_insn_after (pat, before_strlen);
1405 emit_insn_before (pat, get_insns ());
1407 /* Return the value in the proper mode for this function. */
1408 if (GET_MODE (result) == value_mode)
1410 else if (target != 0)
1411 convert_move (target, result, 0);
1413 target = convert_to_mode (value_mode, result, 0);
1419 /* Expand a call to the memcpy builtin, with arguments in ARGLIST. */
1421 expand_builtin_memcpy (arglist)
1425 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1426 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
1427 || TREE_CHAIN (arglist) == 0
1428 || (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist))))
1430 || TREE_CHAIN (TREE_CHAIN (arglist)) == 0
1431 || (TREE_CODE (TREE_TYPE (TREE_VALUE
1432 (TREE_CHAIN (TREE_CHAIN (arglist)))))
1437 tree dest = TREE_VALUE (arglist);
1438 tree src = TREE_VALUE (TREE_CHAIN (arglist));
1439 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1441 int src_align = get_pointer_alignment (src, BIGGEST_ALIGNMENT);
1442 int dest_align = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
1443 rtx dest_mem, src_mem, dest_addr, len_rtx;
1445 /* If either SRC or DEST is not a pointer type, don't do
1446 this operation in-line. */
1447 if (src_align == 0 || dest_align == 0)
1450 dest_mem = get_memory_rtx (dest);
1451 src_mem = get_memory_rtx (src);
1452 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
1454 /* Just copy the rights of SRC to the rights of DEST. */
1455 if (current_function_check_memory_usage)
1456 emit_library_call (chkr_copy_bitmap_libfunc, 1, VOIDmode, 3,
1457 XEXP (dest_mem, 0), Pmode,
1458 XEXP (src_mem, 0), Pmode,
1459 len_rtx, TYPE_MODE (sizetype));
1461 /* Copy word part most expediently. */
1463 = emit_block_move (dest_mem, src_mem, len_rtx,
1464 MIN (src_align, dest_align));
1467 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
1473 /* Expand expression EXP, which is a call to the strcpy builtin. Return 0
1474 if we failed the caller should emit a normal call. */
1477 expand_builtin_strcpy (exp)
1480 tree arglist = TREE_OPERAND (exp, 1);
1484 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1485 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
1486 || TREE_CHAIN (arglist) == 0
1487 || (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist))))
1492 tree len = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
1497 len = size_binop (PLUS_EXPR, len, ssize_int (1));
1498 chainon (arglist, build_tree_list (NULL_TREE, len));
1501 result = expand_builtin_memcpy (arglist);
1504 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
1508 /* Expand expression EXP, which is a call to the memset builtin. Return 0
1509 if we failed the caller should emit a normal call. */
1512 expand_builtin_memset (exp)
1515 tree arglist = TREE_OPERAND (exp, 1);
1518 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1519 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
1520 || TREE_CHAIN (arglist) == 0
1521 || (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist))))
1523 || TREE_CHAIN (TREE_CHAIN (arglist)) == 0
1525 != (TREE_CODE (TREE_TYPE
1527 (TREE_CHAIN (TREE_CHAIN (arglist))))))))
1531 tree dest = TREE_VALUE (arglist);
1532 tree val = TREE_VALUE (TREE_CHAIN (arglist));
1533 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1535 int dest_align = get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
1536 rtx dest_mem, dest_addr, len_rtx;
1538 /* If DEST is not a pointer type, don't do this
1539 operation in-line. */
1540 if (dest_align == 0)
1543 /* If the arguments have side-effects, then we can only evaluate
1544 them at most once. The following code evaluates them twice if
1545 they are not constants because we break out to expand_call
1546 in that case. They can't be constants if they have side-effects
1547 so we can check for that first. Alternatively, we could call
1548 save_expr to make multiple evaluation safe. */
1549 if (TREE_SIDE_EFFECTS (val) || TREE_SIDE_EFFECTS (len))
1552 /* If VAL is not 0, don't do this operation in-line. */
1553 if (expand_expr (val, NULL_RTX, VOIDmode, 0) != const0_rtx)
1556 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
1558 dest_mem = get_memory_rtx (dest);
1560 /* Just check DST is writable and mark it as readable. */
1561 if (current_function_check_memory_usage)
1562 emit_library_call (chkr_check_addr_libfunc, 1, VOIDmode, 3,
1563 XEXP (dest_mem, 0), Pmode,
1564 len_rtx, TYPE_MODE (sizetype),
1565 GEN_INT (MEMORY_USE_WO),
1566 TYPE_MODE (integer_type_node));
1569 dest_addr = clear_storage (dest_mem, len_rtx, dest_align);
1572 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
1578 /* Expand expression EXP, which is a call to the bzero builtin. Return 0
1579 if we failed the caller should emit a normal call. */
1581 expand_builtin_bzero (exp)
1584 tree arglist = TREE_OPERAND (exp, 1);
1585 tree dest, size, newarglist;
1589 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1590 || TREE_CODE (TREE_TYPE (dest = TREE_VALUE (arglist))) != POINTER_TYPE
1591 || TREE_CHAIN (arglist) == 0
1592 || (TREE_CODE (TREE_TYPE (size = TREE_VALUE (TREE_CHAIN (arglist))))
1596 /* New argument list transforming bzero(ptr x, int y) to
1597 memset(ptr x, int 0, size_t y). */
1599 newarglist = build_tree_list (NULL_TREE, convert (sizetype, size));
1600 newarglist = tree_cons (NULL_TREE, integer_zero_node, newarglist);
1601 newarglist = tree_cons (NULL_TREE, dest, newarglist);
1603 TREE_OPERAND (exp, 1) = newarglist;
1604 result = expand_builtin_memset(exp);
1606 /* Always restore the original arguments. */
1607 TREE_OPERAND (exp, 1) = arglist;
1612 #ifdef HAVE_cmpstrsi
1613 /* Expand expression EXP, which is a call to the memcmp or the strcmp builtin.
1614 ARGLIST is the argument list for this call. Return 0 if we failed and the
1615 caller should emit a normal call, otherwise try to get the result in
1616 TARGET, if convenient. */
1618 expand_builtin_memcmp (exp, arglist, target)
1623 /* If we need to check memory accesses, call the library function. */
1624 if (current_function_check_memory_usage)
1628 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1629 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
1630 || TREE_CHAIN (arglist) == 0
1631 || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) != POINTER_TYPE
1632 || TREE_CHAIN (TREE_CHAIN (arglist)) == 0
1633 || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))))) != INTEGER_TYPE)
1637 enum machine_mode mode;
1638 tree arg1 = TREE_VALUE (arglist);
1639 tree arg2 = TREE_VALUE (TREE_CHAIN (arglist));
1640 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1641 rtx arg1_rtx, arg2_rtx, arg3_rtx;
1646 = get_pointer_alignment (arg1, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1648 = get_pointer_alignment (arg2, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1649 enum machine_mode insn_mode
1650 = insn_data[(int) CODE_FOR_cmpstrsi].operand[0].mode;
1652 /* If we don't have POINTER_TYPE, call the function. */
1653 if (arg1_align == 0 || arg2_align == 0)
1656 /* Make a place to write the result of the instruction. */
1659 && GET_CODE (result) == REG && GET_MODE (result) == insn_mode
1660 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
1661 result = gen_reg_rtx (insn_mode);
1663 arg1_rtx = get_memory_rtx (arg1);
1664 arg2_rtx = get_memory_rtx (arg2);
1665 arg3_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
1669 insn = gen_cmpstrsi (result, arg1_rtx, arg2_rtx, arg3_rtx,
1670 GEN_INT (MIN (arg1_align, arg2_align)));
1675 emit_library_call_value (memcmp_libfunc, result, 2,
1676 TYPE_MODE (integer_type_node), 3,
1677 XEXP (arg1_rtx, 0), Pmode,
1678 XEXP (arg2_rtx, 0), Pmode,
1679 convert_to_mode (TYPE_MODE (sizetype), arg3_rtx,
1680 TREE_UNSIGNED (sizetype)),
1681 TYPE_MODE (sizetype));
1683 /* Return the value in the proper mode for this function. */
1684 mode = TYPE_MODE (TREE_TYPE (exp));
1685 if (GET_MODE (result) == mode)
1687 else if (target != 0)
1689 convert_move (target, result, 0);
1693 return convert_to_mode (mode, result, 0);
1697 /* Expand expression EXP, which is a call to the strcmp builtin. Return 0
1698 if we failed the caller should emit a normal call, otherwise try to get
1699 the result in TARGET, if convenient. */
1702 expand_builtin_strcmp (exp, target)
1706 tree arglist = TREE_OPERAND (exp, 1);
1708 /* If we need to check memory accesses, call the library function. */
1709 if (current_function_check_memory_usage)
1713 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1714 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
1715 || TREE_CHAIN (arglist) == 0
1716 || (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist))))
1720 else if (! HAVE_cmpstrsi)
1723 tree arg1 = TREE_VALUE (arglist);
1724 tree arg2 = TREE_VALUE (TREE_CHAIN (arglist));
1725 tree len = c_strlen (arg1);
1726 tree len2 = c_strlen (arg2);
1730 len = size_binop (PLUS_EXPR, ssize_int (1), len);
1733 len2 = size_binop (PLUS_EXPR, ssize_int (1), len2);
1735 /* If we don't have a constant length for the first, use the length
1736 of the second, if we know it. We don't require a constant for
1737 this case; some cost analysis could be done if both are available
1738 but neither is constant. For now, assume they're equally cheap.
1740 If both strings have constant lengths, use the smaller. This
1741 could arise if optimization results in strcpy being called with
1742 two fixed strings, or if the code was machine-generated. We should
1743 add some code to the `memcmp' handler below to deal with such
1744 situations, someday. */
1746 if (!len || TREE_CODE (len) != INTEGER_CST)
1753 else if (len2 && TREE_CODE (len2) == INTEGER_CST
1754 && tree_int_cst_lt (len2, len))
1757 chainon (arglist, build_tree_list (NULL_TREE, len));
1758 result = expand_builtin_memcmp (exp, arglist, target);
1760 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
1767 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
1768 if that's convenient. */
1771 expand_builtin_saveregs ()
1775 /* Don't do __builtin_saveregs more than once in a function.
1776 Save the result of the first call and reuse it. */
1777 if (saveregs_value != 0)
1778 return saveregs_value;
1780 /* When this function is called, it means that registers must be
1781 saved on entry to this function. So we migrate the call to the
1782 first insn of this function. */
1786 #ifdef EXPAND_BUILTIN_SAVEREGS
1787 /* Do whatever the machine needs done in this case. */
1788 val = EXPAND_BUILTIN_SAVEREGS ();
1790 /* ??? We used to try and build up a call to the out of line function,
1791 guessing about what registers needed saving etc. This became much
1792 harder with __builtin_va_start, since we don't have a tree for a
1793 call to __builtin_saveregs to fall back on. There was exactly one
1794 port (i860) that used this code, and I'm unconvinced it could actually
1795 handle the general case. So we no longer try to handle anything
1796 weird and make the backend absorb the evil. */
1798 error ("__builtin_saveregs not supported by this target");
1805 saveregs_value = val;
1807 /* Put the sequence after the NOTE that starts the function. If this
1808 is inside a SEQUENCE, make the outer-level insn chain current, so
1809 the code is placed at the start of the function. */
1810 push_topmost_sequence ();
1811 emit_insns_after (seq, get_insns ());
1812 pop_topmost_sequence ();
1817 /* __builtin_args_info (N) returns word N of the arg space info
1818 for the current function. The number and meanings of words
1819 is controlled by the definition of CUMULATIVE_ARGS. */
1822 expand_builtin_args_info (exp)
1825 tree arglist = TREE_OPERAND (exp, 1);
1826 int nwords = sizeof (CUMULATIVE_ARGS) / sizeof (int);
1827 int *word_ptr = (int *) ¤t_function_args_info;
1829 /* These are used by the code below that is if 0'ed away */
1831 tree type, elts, result;
1834 if (sizeof (CUMULATIVE_ARGS) % sizeof (int) != 0)
1839 tree arg = TREE_VALUE (arglist);
1840 if (TREE_CODE (arg) != INTEGER_CST)
1841 error ("argument of `__builtin_args_info' must be constant");
1844 int wordnum = TREE_INT_CST_LOW (arg);
1846 if (wordnum < 0 || wordnum >= nwords || TREE_INT_CST_HIGH (arg))
1847 error ("argument of `__builtin_args_info' out of range");
1849 return GEN_INT (word_ptr[wordnum]);
1853 error ("missing argument in `__builtin_args_info'");
1858 for (i = 0; i < nwords; i++)
1859 elts = tree_cons (NULL_TREE, build_int_2 (word_ptr[i], 0));
1861 type = build_array_type (integer_type_node,
1862 build_index_type (build_int_2 (nwords, 0)));
1863 result = build (CONSTRUCTOR, type, NULL_TREE, nreverse (elts));
1864 TREE_CONSTANT (result) = 1;
1865 TREE_STATIC (result) = 1;
1866 result = build1 (INDIRECT_REF, build_pointer_type (type), result);
1867 TREE_CONSTANT (result) = 1;
1868 return expand_expr (result, NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD);
1872 /* Expand ARGLIST, from a call to __builtin_next_arg. */
1874 expand_builtin_next_arg (arglist)
1877 tree fntype = TREE_TYPE (current_function_decl);
1879 if ((TYPE_ARG_TYPES (fntype) == 0
1880 || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype)))
1882 && ! current_function_varargs)
1884 error ("`va_start' used in function with fixed args");
1890 tree last_parm = tree_last (DECL_ARGUMENTS (current_function_decl));
1891 tree arg = TREE_VALUE (arglist);
1893 /* Strip off all nops for the sake of the comparison. This
1894 is not quite the same as STRIP_NOPS. It does more.
1895 We must also strip off INDIRECT_EXPR for C++ reference
1897 while (TREE_CODE (arg) == NOP_EXPR
1898 || TREE_CODE (arg) == CONVERT_EXPR
1899 || TREE_CODE (arg) == NON_LVALUE_EXPR
1900 || TREE_CODE (arg) == INDIRECT_REF)
1901 arg = TREE_OPERAND (arg, 0);
1902 if (arg != last_parm)
1903 warning ("second parameter of `va_start' not last named argument");
1905 else if (! current_function_varargs)
1906 /* Evidently an out of date version of <stdarg.h>; can't validate
1907 va_start's second argument, but can still work as intended. */
1908 warning ("`__builtin_next_arg' called without an argument");
1910 return expand_binop (Pmode, add_optab,
1911 current_function_internal_arg_pointer,
1912 current_function_arg_offset_rtx,
1913 NULL_RTX, 0, OPTAB_LIB_WIDEN);
1916 /* Make it easier for the backends by protecting the valist argument
1917 from multiple evaluations. */
1920 stabilize_va_list (valist, needs_lvalue)
1924 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
1926 if (TREE_SIDE_EFFECTS (valist))
1927 valist = save_expr (valist);
1929 /* For this case, the backends will be expecting a pointer to
1930 TREE_TYPE (va_list_type_node), but it's possible we've
1931 actually been given an array (an actual va_list_type_node).
1933 if (TREE_CODE (TREE_TYPE (valist)) == ARRAY_TYPE)
1935 tree p1 = build_pointer_type (TREE_TYPE (va_list_type_node));
1936 tree p2 = build_pointer_type (va_list_type_node);
1938 valist = build1 (ADDR_EXPR, p2, valist);
1939 valist = fold (build1 (NOP_EXPR, p1, valist));
1948 if (! TREE_SIDE_EFFECTS (valist))
1951 pt = build_pointer_type (va_list_type_node);
1952 valist = fold (build1 (ADDR_EXPR, pt, valist));
1953 TREE_SIDE_EFFECTS (valist) = 1;
1956 if (TREE_SIDE_EFFECTS (valist))
1957 valist = save_expr (valist);
1958 valist = fold (build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (valist)),
1965 /* The "standard" implementation of va_start: just assign `nextarg' to
1968 std_expand_builtin_va_start (stdarg_p, valist, nextarg)
1969 int stdarg_p ATTRIBUTE_UNUSED;
1976 nextarg = plus_constant (nextarg, -UNITS_PER_WORD);
1978 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
1979 make_tree (ptr_type_node, nextarg));
1980 TREE_SIDE_EFFECTS (t) = 1;
1982 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
1985 /* Expand ARGLIST, which from a call to __builtin_stdarg_va_start or
1986 __builtin_varargs_va_start, depending on STDARG_P. */
1988 expand_builtin_va_start (stdarg_p, arglist)
1993 tree chain = arglist, valist;
1996 nextarg = expand_builtin_next_arg (chain = TREE_CHAIN (arglist));
1998 nextarg = expand_builtin_next_arg (NULL_TREE);
2000 if (TREE_CHAIN (chain))
2001 error ("too many arguments to function `va_start'");
2003 valist = stabilize_va_list (TREE_VALUE (arglist), 1);
2005 #ifdef EXPAND_BUILTIN_VA_START
2006 EXPAND_BUILTIN_VA_START (stdarg_p, valist, nextarg);
2008 std_expand_builtin_va_start (stdarg_p, valist, nextarg);
2014 /* The "standard" implementation of va_arg: read the value from the
2015 current (padded) address and increment by the (padded) size. */
2018 std_expand_builtin_va_arg (valist, type)
2022 HOST_WIDE_INT align;
2023 HOST_WIDE_INT rounded_size;
2026 /* Compute the rounded size of the type. */
2027 align = PARM_BOUNDARY / BITS_PER_UNIT;
2028 rounded_size = (((int_size_in_bytes (type) + align - 1) / align) * align);
2032 if (PAD_VARARGS_DOWN)
2034 /* Small args are padded downward. */
2037 adj = TREE_INT_CST_LOW (TYPE_SIZE (type)) / BITS_PER_UNIT;
2038 if (rounded_size > align)
2041 addr_tree = build (PLUS_EXPR, TREE_TYPE (addr_tree), addr_tree,
2042 build_int_2 (rounded_size - adj, 0));
2045 addr = expand_expr (addr_tree, NULL_RTX, Pmode, EXPAND_NORMAL);
2046 addr = copy_to_reg (addr);
2048 /* Compute new value for AP. */
2049 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
2050 build (PLUS_EXPR, TREE_TYPE (valist), valist,
2051 build_int_2 (rounded_size, 0)));
2052 TREE_SIDE_EFFECTS (t) = 1;
2053 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2058 /* Expand __builtin_va_arg, which is not really a builtin function, but
2059 a very special sort of operator. */
2062 expand_builtin_va_arg (valist, type)
2066 tree promoted_type, want_va_type, have_va_type;
2068 /* Verify that valist is of the proper type. */
2070 want_va_type = va_list_type_node;
2071 have_va_type = TREE_TYPE (valist);
2072 if (TREE_CODE (want_va_type) == ARRAY_TYPE)
2074 /* If va_list is an array type, the argument may have decayed
2075 to a pointer type, e.g. by being passed to another function.
2076 In that case, unwrap both types so that we can compare the
2077 underlying records. */
2078 if (TREE_CODE (have_va_type) == ARRAY_TYPE
2079 || TREE_CODE (have_va_type) == POINTER_TYPE)
2081 want_va_type = TREE_TYPE (want_va_type);
2082 have_va_type = TREE_TYPE (have_va_type);
2085 if (TYPE_MAIN_VARIANT (want_va_type) != TYPE_MAIN_VARIANT (have_va_type))
2087 error ("first argument to `va_arg' not of type `va_list'");
2091 /* Generate a diagnostic for requesting data of a type that cannot
2092 be passed through `...' due to type promotion at the call site. */
2093 else if ((promoted_type = (*lang_type_promotes_to) (type)) != NULL_TREE)
2095 const char *name = "<anonymous type>", *pname = 0;
2096 static int gave_help;
2098 if (TYPE_NAME (type))
2100 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
2101 name = IDENTIFIER_POINTER (TYPE_NAME (type));
2102 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
2103 && DECL_NAME (TYPE_NAME (type)))
2104 name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
2106 if (TYPE_NAME (promoted_type))
2108 if (TREE_CODE (TYPE_NAME (promoted_type)) == IDENTIFIER_NODE)
2109 pname = IDENTIFIER_POINTER (TYPE_NAME (promoted_type));
2110 else if (TREE_CODE (TYPE_NAME (promoted_type)) == TYPE_DECL
2111 && DECL_NAME (TYPE_NAME (promoted_type)))
2112 pname = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (promoted_type)));
2115 error ("`%s' is promoted to `%s' when passed through `...'", name, pname);
2119 error ("(so you should pass `%s' not `%s' to `va_arg')", pname, name);
2126 /* Make it easier for the backends by protecting the valist argument
2127 from multiple evaluations. */
2128 valist = stabilize_va_list (valist, 0);
2130 #ifdef EXPAND_BUILTIN_VA_ARG
2131 addr = EXPAND_BUILTIN_VA_ARG (valist, type);
2133 addr = std_expand_builtin_va_arg (valist, type);
2137 result = gen_rtx_MEM (TYPE_MODE (type), addr);
2138 MEM_ALIAS_SET (result) = get_varargs_alias_set ();
2143 /* Expand ARGLIST, from a call to __builtin_va_end. */
2146 expand_builtin_va_end (arglist)
2149 tree valist = TREE_VALUE (arglist);
2151 #ifdef EXPAND_BUILTIN_VA_END
2152 valist = stabilize_va_list (valist, 0);
2153 EXPAND_BUILTIN_VA_END(arglist);
2155 /* Evaluate for side effects, if needed. I hate macros that don't
2157 if (TREE_SIDE_EFFECTS (valist))
2158 expand_expr (valist, const0_rtx, VOIDmode, EXPAND_NORMAL);
2164 /* Expand ARGLIST, from a call to __builtin_va_copy. We do this as a
2165 builtin rather than just as an assignment in stdarg.h because of the
2166 nastiness of array-type va_list types. */
2169 expand_builtin_va_copy (arglist)
2174 dst = TREE_VALUE (arglist);
2175 src = TREE_VALUE (TREE_CHAIN (arglist));
2177 dst = stabilize_va_list (dst, 1);
2178 src = stabilize_va_list (src, 0);
2180 if (TREE_CODE (va_list_type_node) != ARRAY_TYPE)
2182 t = build (MODIFY_EXPR, va_list_type_node, dst, src);
2183 TREE_SIDE_EFFECTS (t) = 1;
2184 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2188 rtx dstb, srcb, size;
2190 /* Evaluate to pointers. */
2191 dstb = expand_expr (dst, NULL_RTX, Pmode, EXPAND_NORMAL);
2192 srcb = expand_expr (src, NULL_RTX, Pmode, EXPAND_NORMAL);
2193 size = expand_expr (TYPE_SIZE_UNIT (va_list_type_node), NULL_RTX,
2194 VOIDmode, EXPAND_NORMAL);
2196 /* "Dereference" to BLKmode memories. */
2197 dstb = gen_rtx_MEM (BLKmode, dstb);
2198 MEM_ALIAS_SET (dstb) = get_alias_set (TREE_TYPE (TREE_TYPE (dst)));
2199 srcb = gen_rtx_MEM (BLKmode, srcb);
2200 MEM_ALIAS_SET (srcb) = get_alias_set (TREE_TYPE (TREE_TYPE (src)));
2203 emit_block_move (dstb, srcb, size, TYPE_ALIGN (va_list_type_node));
2209 /* Expand a call to one of the builtin functions __builtin_frame_address or
2210 __builtin_return_address. */
2212 expand_builtin_frame_address (exp)
2215 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
2216 tree arglist = TREE_OPERAND (exp, 1);
2218 /* The argument must be a nonnegative integer constant.
2219 It counts the number of frames to scan up the stack.
2220 The value is the return address saved in that frame. */
2222 /* Warning about missing arg was already issued. */
2224 else if (TREE_CODE (TREE_VALUE (arglist)) != INTEGER_CST
2225 || tree_int_cst_sgn (TREE_VALUE (arglist)) < 0)
2227 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
2228 error ("invalid arg to `__builtin_frame_address'");
2230 error ("invalid arg to `__builtin_return_address'");
2235 rtx tem = expand_builtin_return_addr (DECL_FUNCTION_CODE (fndecl),
2236 TREE_INT_CST_LOW (TREE_VALUE (arglist)),
2237 hard_frame_pointer_rtx);
2239 /* Some ports cannot access arbitrary stack frames. */
2242 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
2243 warning ("unsupported arg to `__builtin_frame_address'");
2245 warning ("unsupported arg to `__builtin_return_address'");
2249 /* For __builtin_frame_address, return what we've got. */
2250 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
2253 if (GET_CODE (tem) != REG
2254 && ! CONSTANT_P (tem))
2255 tem = copy_to_mode_reg (Pmode, tem);
2260 /* Expand a call to the alloca builtin, with arguments ARGLIST. Return 0 if
2261 we failed and the caller should emit a normal call, otherwise try to get
2262 the result in TARGET, if convenient. */
2264 expand_builtin_alloca (arglist, target)
2271 /* Arg could be non-integer if user redeclared this fcn wrong. */
2272 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != INTEGER_TYPE)
2275 /* Compute the argument. */
2276 op0 = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
2278 /* Allocate the desired space. */
2279 return allocate_dynamic_stack_space (op0, target, BITS_PER_UNIT);
2282 /* Expand a call to the ffs builtin. The arguments are in ARGLIST.
2283 Return 0 if a normal call should be emitted rather than expanding the
2284 function in-line. If convenient, the result should be placed in TARGET.
2285 SUBTARGET may be used as the target for computing one of EXP's operands. */
2287 expand_builtin_ffs (arglist, target, subtarget)
2289 rtx target, subtarget;
2293 /* Arg could be non-integer if user redeclared this fcn wrong. */
2294 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != INTEGER_TYPE)
2297 /* Compute the argument. */
2298 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
2299 /* Compute ffs, into TARGET if possible.
2300 Set TARGET to wherever the result comes back. */
2301 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
2302 ffs_optab, op0, target, 1);
2308 /* Expand a call to __builtin_expect. We return our argument and
2309 emit a NOTE_INSN_EXPECTED_VALUE note. */
2312 expand_builtin_expect (arglist, target)
2319 if (arglist == NULL_TREE
2320 || TREE_CHAIN (arglist) == NULL_TREE)
2322 exp = TREE_VALUE (arglist);
2323 c = TREE_VALUE (TREE_CHAIN (arglist));
2325 if (TREE_CODE (c) != INTEGER_CST)
2327 error ("second arg to `__builtin_expect' must be a constant");
2328 c = integer_zero_node;
2331 target = expand_expr (exp, target, VOIDmode, EXPAND_NORMAL);
2333 /* Don't bother with expected value notes for integral constants. */
2334 if (GET_CODE (target) != CONST_INT)
2336 /* We do need to force this into a register so that we can be
2337 moderately sure to be able to correctly interpret the branch
2339 target = force_reg (GET_MODE (target), target);
2341 rtx_c = expand_expr (c, NULL_RTX, GET_MODE (target), EXPAND_NORMAL);
2343 note = emit_note (NULL, NOTE_INSN_EXPECTED_VALUE);
2344 NOTE_EXPECTED_VALUE (note) = gen_rtx_EQ (VOIDmode, target, rtx_c);
2350 /* Expand an expression EXP that calls a built-in function,
2351 with result going to TARGET if that's convenient
2352 (and in mode MODE if that's convenient).
2353 SUBTARGET may be used as the target for computing one of EXP's operands.
2354 IGNORE is nonzero if the value is to be ignored. */
2357 expand_builtin (exp, target, subtarget, mode, ignore)
2361 enum machine_mode mode;
2364 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
2365 tree arglist = TREE_OPERAND (exp, 1);
2366 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
2368 #ifdef MD_EXPAND_BUILTIN
2369 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
2370 return MD_EXPAND_BUILTIN (exp, target, subtarget, mode, ignore);
2373 /* When not optimizing, generate calls to library functions for a certain
2375 if (! optimize && ! CALLED_AS_BUILT_IN (fndecl)
2376 && (fcode == BUILT_IN_SIN || fcode == BUILT_IN_COS
2377 || fcode == BUILT_IN_FSQRT || fcode == BUILT_IN_MEMSET
2378 || fcode == BUILT_IN_MEMCPY || fcode == BUILT_IN_MEMCMP
2379 || fcode == BUILT_IN_BCMP || fcode == BUILT_IN_BZERO
2380 || fcode == BUILT_IN_STRLEN || fcode == BUILT_IN_STRCPY
2381 || fcode == BUILT_IN_STRCMP || fcode == BUILT_IN_FFS))
2382 return expand_call (exp, target, ignore);
2389 /* build_function_call changes these into ABS_EXPR. */
2394 /* Treat these like sqrt, but only if the user asks for them. */
2395 if (! flag_fast_math)
2397 case BUILT_IN_FSQRT:
2398 target = expand_builtin_mathfn (exp, target, subtarget);
2406 case BUILT_IN_APPLY_ARGS:
2407 return expand_builtin_apply_args ();
2409 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
2410 FUNCTION with a copy of the parameters described by
2411 ARGUMENTS, and ARGSIZE. It returns a block of memory
2412 allocated on the stack into which is stored all the registers
2413 that might possibly be used for returning the result of a
2414 function. ARGUMENTS is the value returned by
2415 __builtin_apply_args. ARGSIZE is the number of bytes of
2416 arguments that must be copied. ??? How should this value be
2417 computed? We'll also need a safe worst case value for varargs
2419 case BUILT_IN_APPLY:
2421 /* Arg could be non-pointer if user redeclared this fcn wrong. */
2422 || ! POINTER_TYPE_P (TREE_TYPE (TREE_VALUE (arglist)))
2423 || TREE_CHAIN (arglist) == 0
2424 || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) != POINTER_TYPE
2425 || TREE_CHAIN (TREE_CHAIN (arglist)) == 0
2426 || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))))) != INTEGER_TYPE)
2434 for (t = arglist, i = 0; t; t = TREE_CHAIN (t), i++)
2435 ops[i] = expand_expr (TREE_VALUE (t), NULL_RTX, VOIDmode, 0);
2437 return expand_builtin_apply (ops[0], ops[1], ops[2]);
2440 /* __builtin_return (RESULT) causes the function to return the
2441 value described by RESULT. RESULT is address of the block of
2442 memory returned by __builtin_apply. */
2443 case BUILT_IN_RETURN:
2445 /* Arg could be non-pointer if user redeclared this fcn wrong. */
2446 && TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) == POINTER_TYPE)
2447 expand_builtin_return (expand_expr (TREE_VALUE (arglist),
2448 NULL_RTX, VOIDmode, 0));
2451 case BUILT_IN_SAVEREGS:
2452 return expand_builtin_saveregs ();
2454 case BUILT_IN_ARGS_INFO:
2455 return expand_builtin_args_info (exp);
2457 /* Return the address of the first anonymous stack arg. */
2458 case BUILT_IN_NEXT_ARG:
2459 return expand_builtin_next_arg (arglist);
2461 case BUILT_IN_CLASSIFY_TYPE:
2462 return expand_builtin_classify_type (arglist);
2464 case BUILT_IN_CONSTANT_P:
2465 return expand_builtin_constant_p (exp);
2467 case BUILT_IN_FRAME_ADDRESS:
2468 case BUILT_IN_RETURN_ADDRESS:
2469 return expand_builtin_frame_address (exp);
2471 /* Returns the address of the area where the structure is returned.
2473 case BUILT_IN_AGGREGATE_INCOMING_ADDRESS:
2475 || ! AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl)))
2476 || GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl))) != MEM)
2479 return XEXP (DECL_RTL (DECL_RESULT (current_function_decl)), 0);
2481 case BUILT_IN_ALLOCA:
2482 target = expand_builtin_alloca (arglist, target);
2488 target = expand_builtin_ffs (arglist, target, subtarget);
2493 case BUILT_IN_STRLEN:
2494 target = expand_builtin_strlen (exp, target, mode);
2499 case BUILT_IN_STRCPY:
2500 target = expand_builtin_strcpy (exp);
2505 case BUILT_IN_MEMCPY:
2506 target = expand_builtin_memcpy (arglist);
2511 case BUILT_IN_MEMSET:
2512 target = expand_builtin_memset (exp);
2517 case BUILT_IN_BZERO:
2518 target = expand_builtin_bzero (exp);
2523 /* These comparison functions need an instruction that returns an actual
2524 index. An ordinary compare that just sets the condition codes
2526 #ifdef HAVE_cmpstrsi
2527 case BUILT_IN_STRCMP:
2528 target = expand_builtin_strcmp (exp, target);
2534 case BUILT_IN_MEMCMP:
2535 target = expand_builtin_memcmp (exp, arglist, target);
2540 case BUILT_IN_STRCMP:
2542 case BUILT_IN_MEMCMP:
2546 case BUILT_IN_SETJMP:
2548 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE)
2552 rtx buf_addr = expand_expr (TREE_VALUE (arglist), subtarget,
2554 rtx lab = gen_label_rtx ();
2555 rtx ret = expand_builtin_setjmp (buf_addr, target, lab, lab);
2560 /* __builtin_longjmp is passed a pointer to an array of five words.
2561 It's similar to the C library longjmp function but works with
2562 __builtin_setjmp above. */
2563 case BUILT_IN_LONGJMP:
2564 if (arglist == 0 || TREE_CHAIN (arglist) == 0
2565 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE)
2569 rtx buf_addr = expand_expr (TREE_VALUE (arglist), subtarget,
2571 rtx value = expand_expr (TREE_VALUE (TREE_CHAIN (arglist)),
2572 NULL_RTX, VOIDmode, 0);
2574 if (value != const1_rtx)
2576 error ("__builtin_longjmp second argument must be 1");
2580 expand_builtin_longjmp (buf_addr, value);
2587 emit_insn (gen_trap ());
2590 error ("__builtin_trap not supported by this target");
2594 /* Various hooks for the DWARF 2 __throw routine. */
2595 case BUILT_IN_UNWIND_INIT:
2596 expand_builtin_unwind_init ();
2598 case BUILT_IN_DWARF_CFA:
2599 return virtual_cfa_rtx;
2600 #ifdef DWARF2_UNWIND_INFO
2601 case BUILT_IN_DWARF_FP_REGNUM:
2602 return expand_builtin_dwarf_fp_regnum ();
2603 case BUILT_IN_INIT_DWARF_REG_SIZES:
2604 expand_builtin_init_dwarf_reg_sizes (TREE_VALUE (arglist));
2607 case BUILT_IN_FROB_RETURN_ADDR:
2608 return expand_builtin_frob_return_addr (TREE_VALUE (arglist));
2609 case BUILT_IN_EXTRACT_RETURN_ADDR:
2610 return expand_builtin_extract_return_addr (TREE_VALUE (arglist));
2611 case BUILT_IN_EH_RETURN:
2612 expand_builtin_eh_return (TREE_VALUE (arglist),
2613 TREE_VALUE (TREE_CHAIN (arglist)),
2614 TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))));
2616 case BUILT_IN_VARARGS_START:
2617 return expand_builtin_va_start (0, arglist);
2618 case BUILT_IN_STDARG_START:
2619 return expand_builtin_va_start (1, arglist);
2620 case BUILT_IN_VA_END:
2621 return expand_builtin_va_end (arglist);
2622 case BUILT_IN_VA_COPY:
2623 return expand_builtin_va_copy (arglist);
2624 case BUILT_IN_EXPECT:
2625 return expand_builtin_expect (arglist, target);
2627 default: /* just do library call, if unknown builtin */
2628 error ("built-in function `%s' not currently supported",
2629 IDENTIFIER_POINTER (DECL_NAME (fndecl)));
2632 /* The switch statement above can drop through to cause the function
2633 to be called normally. */
2634 return expand_call (exp, target, ignore);