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)
138 inner = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
139 align = MIN (inner, max_align);
143 /* If sum of pointer + int, restrict our maximum alignment to that
144 imposed by the integer. If not, we can't do any better than
146 if (TREE_CODE (TREE_OPERAND (exp, 1)) != INTEGER_CST)
149 while (((TREE_INT_CST_LOW (TREE_OPERAND (exp, 1)) * BITS_PER_UNIT)
154 exp = TREE_OPERAND (exp, 0);
158 /* See what we are pointing at and look at its alignment. */
159 exp = TREE_OPERAND (exp, 0);
160 if (TREE_CODE (exp) == FUNCTION_DECL)
161 align = FUNCTION_BOUNDARY;
162 else if (DECL_P (exp))
163 align = DECL_ALIGN (exp);
164 #ifdef CONSTANT_ALIGNMENT
165 else if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'c')
166 align = CONSTANT_ALIGNMENT (exp, align);
168 return MIN (align, max_align);
176 /* Compute the length of a C string. TREE_STRING_LENGTH is not the right
177 way, because it could contain a zero byte in the middle.
178 TREE_STRING_LENGTH is the size of the character array, not the string.
180 The value returned is of type `ssizetype'.
182 Unfortunately, string_constant can't access the values of const char
183 arrays with initializers, so neither can we do so here. */
193 src = string_constant (src, &offset_node);
197 max = TREE_STRING_LENGTH (src);
198 ptr = TREE_STRING_POINTER (src);
200 if (offset_node && TREE_CODE (offset_node) != INTEGER_CST)
202 /* If the string has an internal zero byte (e.g., "foo\0bar"), we can't
203 compute the offset to the following null if we don't know where to
204 start searching for it. */
207 for (i = 0; i < max; i++)
211 /* We don't know the starting offset, but we do know that the string
212 has no internal zero bytes. We can assume that the offset falls
213 within the bounds of the string; otherwise, the programmer deserves
214 what he gets. Subtract the offset from the length of the string,
215 and return that. This would perhaps not be valid if we were dealing
216 with named arrays in addition to literal string constants. */
218 return size_diffop (size_int (max), offset_node);
221 /* We have a known offset into the string. Start searching there for
223 if (offset_node == 0)
227 /* Did we get a long long offset? If so, punt. */
228 if (TREE_INT_CST_HIGH (offset_node) != 0)
230 offset = TREE_INT_CST_LOW (offset_node);
233 /* If the offset is known to be out of bounds, warn, and call strlen at
235 if (offset < 0 || offset > max)
237 warning ("offset outside bounds of constant string");
241 /* Use strlen to search for the first zero byte. Since any strings
242 constructed with build_string will have nulls appended, we win even
243 if we get handed something like (char[4])"abcd".
245 Since OFFSET is our starting index into the string, no further
246 calculation is needed. */
247 return ssize_int (strlen (ptr + offset));
250 /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
251 times to get the address of either a higher stack frame, or a return
252 address located within it (depending on FNDECL_CODE). */
255 expand_builtin_return_addr (fndecl_code, count, tem)
256 enum built_in_function fndecl_code;
262 /* Some machines need special handling before we can access
263 arbitrary frames. For example, on the sparc, we must first flush
264 all register windows to the stack. */
265 #ifdef SETUP_FRAME_ADDRESSES
267 SETUP_FRAME_ADDRESSES ();
270 /* On the sparc, the return address is not in the frame, it is in a
271 register. There is no way to access it off of the current frame
272 pointer, but it can be accessed off the previous frame pointer by
273 reading the value from the register window save area. */
274 #ifdef RETURN_ADDR_IN_PREVIOUS_FRAME
275 if (fndecl_code == BUILT_IN_RETURN_ADDRESS)
279 /* Scan back COUNT frames to the specified frame. */
280 for (i = 0; i < count; i++)
282 /* Assume the dynamic chain pointer is in the word that the
283 frame address points to, unless otherwise specified. */
284 #ifdef DYNAMIC_CHAIN_ADDRESS
285 tem = DYNAMIC_CHAIN_ADDRESS (tem);
287 tem = memory_address (Pmode, tem);
288 tem = copy_to_reg (gen_rtx_MEM (Pmode, tem));
291 /* For __builtin_frame_address, return what we've got. */
292 if (fndecl_code == BUILT_IN_FRAME_ADDRESS)
295 /* For __builtin_return_address, Get the return address from that
297 #ifdef RETURN_ADDR_RTX
298 tem = RETURN_ADDR_RTX (count, tem);
300 tem = memory_address (Pmode,
301 plus_constant (tem, GET_MODE_SIZE (Pmode)));
302 tem = gen_rtx_MEM (Pmode, tem);
307 /* __builtin_setjmp is passed a pointer to an array of five words (not
308 all will be used on all machines). It operates similarly to the C
309 library function of the same name, but is more efficient. Much of
310 the code below (and for longjmp) is copied from the handling of
313 NOTE: This is intended for use by GNAT and the exception handling
314 scheme in the compiler and will only work in the method used by
318 expand_builtin_setjmp (buf_addr, target, first_label, next_label)
321 rtx first_label, next_label;
323 rtx lab1 = gen_label_rtx ();
324 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
325 enum machine_mode value_mode;
328 value_mode = TYPE_MODE (integer_type_node);
330 #ifdef POINTERS_EXTEND_UNSIGNED
331 buf_addr = convert_memory_address (Pmode, buf_addr);
334 buf_addr = force_reg (Pmode, force_operand (buf_addr, NULL_RTX));
336 if (target == 0 || GET_CODE (target) != REG
337 || REGNO (target) < FIRST_PSEUDO_REGISTER)
338 target = gen_reg_rtx (value_mode);
342 /* We store the frame pointer and the address of lab1 in the buffer
343 and use the rest of it for the stack save area, which is
344 machine-dependent. */
346 #ifndef BUILTIN_SETJMP_FRAME_VALUE
347 #define BUILTIN_SETJMP_FRAME_VALUE virtual_stack_vars_rtx
350 emit_move_insn (gen_rtx_MEM (Pmode, buf_addr),
351 BUILTIN_SETJMP_FRAME_VALUE);
352 emit_move_insn (validize_mem
354 plus_constant (buf_addr,
355 GET_MODE_SIZE (Pmode)))),
356 force_reg (Pmode, gen_rtx_LABEL_REF (Pmode, lab1)));
358 stack_save = gen_rtx_MEM (sa_mode,
359 plus_constant (buf_addr,
360 2 * GET_MODE_SIZE (Pmode)));
361 emit_stack_save (SAVE_NONLOCAL, &stack_save, NULL_RTX);
363 /* If there is further processing to do, do it. */
364 #ifdef HAVE_builtin_setjmp_setup
365 if (HAVE_builtin_setjmp_setup)
366 emit_insn (gen_builtin_setjmp_setup (buf_addr));
369 /* Set TARGET to zero and branch to the first-time-through label. */
370 emit_move_insn (target, const0_rtx);
371 emit_jump_insn (gen_jump (first_label));
375 /* Tell flow about the strange goings on. Putting `lab1' on
376 `nonlocal_goto_handler_labels' to indicates that function
377 calls may traverse the arc back to this label. */
379 current_function_has_nonlocal_label = 1;
380 nonlocal_goto_handler_labels =
381 gen_rtx_EXPR_LIST (VOIDmode, lab1, nonlocal_goto_handler_labels);
383 /* Clobber the FP when we get here, so we have to make sure it's
384 marked as used by this function. */
385 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
387 /* Mark the static chain as clobbered here so life information
388 doesn't get messed up for it. */
389 emit_insn (gen_rtx_CLOBBER (VOIDmode, static_chain_rtx));
391 /* Now put in the code to restore the frame pointer, and argument
392 pointer, if needed. The code below is from expand_end_bindings
393 in stmt.c; see detailed documentation there. */
394 #ifdef HAVE_nonlocal_goto
395 if (! HAVE_nonlocal_goto)
397 emit_move_insn (virtual_stack_vars_rtx, hard_frame_pointer_rtx);
399 #if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
400 if (fixed_regs[ARG_POINTER_REGNUM])
402 #ifdef ELIMINABLE_REGS
404 static struct elims {int from, to;} elim_regs[] = ELIMINABLE_REGS;
406 for (i = 0; i < sizeof elim_regs / sizeof elim_regs[0]; i++)
407 if (elim_regs[i].from == ARG_POINTER_REGNUM
408 && elim_regs[i].to == HARD_FRAME_POINTER_REGNUM)
411 if (i == sizeof elim_regs / sizeof elim_regs [0])
414 /* Now restore our arg pointer from the address at which it
415 was saved in our stack frame.
416 If there hasn't be space allocated for it yet, make
418 if (arg_pointer_save_area == 0)
419 arg_pointer_save_area
420 = assign_stack_local (Pmode, GET_MODE_SIZE (Pmode), 0);
421 emit_move_insn (virtual_incoming_args_rtx,
422 copy_to_reg (arg_pointer_save_area));
427 #ifdef HAVE_builtin_setjmp_receiver
428 if (HAVE_builtin_setjmp_receiver)
429 emit_insn (gen_builtin_setjmp_receiver (lab1));
432 #ifdef HAVE_nonlocal_goto_receiver
433 if (HAVE_nonlocal_goto_receiver)
434 emit_insn (gen_nonlocal_goto_receiver ());
441 /* Set TARGET, and branch to the next-time-through label. */
442 emit_move_insn (target, const1_rtx);
443 emit_jump_insn (gen_jump (next_label));
449 /* __builtin_longjmp is passed a pointer to an array of five words (not
450 all will be used on all machines). It operates similarly to the C
451 library function of the same name, but is more efficient. Much of
452 the code below is copied from the handling of non-local gotos.
454 NOTE: This is intended for use by GNAT and the exception handling
455 scheme in the compiler and will only work in the method used by
459 expand_builtin_longjmp (buf_addr, value)
463 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
465 #ifdef POINTERS_EXTEND_UNSIGNED
466 buf_addr = convert_memory_address (Pmode, buf_addr);
468 buf_addr = force_reg (Pmode, buf_addr);
470 /* We used to store value in static_chain_rtx, but that fails if pointers
471 are smaller than integers. We instead require that the user must pass
472 a second argument of 1, because that is what builtin_setjmp will
473 return. This also makes EH slightly more efficient, since we are no
474 longer copying around a value that we don't care about. */
475 if (value != const1_rtx)
478 #ifdef HAVE_builtin_longjmp
479 if (HAVE_builtin_longjmp)
480 emit_insn (gen_builtin_longjmp (buf_addr));
484 fp = gen_rtx_MEM (Pmode, buf_addr);
485 lab = gen_rtx_MEM (Pmode, plus_constant (buf_addr,
486 GET_MODE_SIZE (Pmode)));
488 stack = gen_rtx_MEM (sa_mode, plus_constant (buf_addr,
489 2 * GET_MODE_SIZE (Pmode)));
491 /* Pick up FP, label, and SP from the block and jump. This code is
492 from expand_goto in stmt.c; see there for detailed comments. */
493 #if HAVE_nonlocal_goto
494 if (HAVE_nonlocal_goto)
495 /* We have to pass a value to the nonlocal_goto pattern that will
496 get copied into the static_chain pointer, but it does not matter
497 what that value is, because builtin_setjmp does not use it. */
498 emit_insn (gen_nonlocal_goto (value, fp, stack, lab));
502 lab = copy_to_reg (lab);
504 emit_move_insn (hard_frame_pointer_rtx, fp);
505 emit_stack_restore (SAVE_NONLOCAL, stack, NULL_RTX);
507 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
508 emit_insn (gen_rtx_USE (VOIDmode, stack_pointer_rtx));
509 emit_indirect_jump (lab);
514 /* Get a MEM rtx for expression EXP which can be used in a string instruction
515 (cmpstrsi, movstrsi, ..). */
523 mem = gen_rtx_MEM (BLKmode,
524 memory_address (BLKmode,
525 expand_expr (exp, NULL_RTX,
526 ptr_mode, EXPAND_SUM)));
528 RTX_UNCHANGING_P (mem) = TREE_READONLY (exp);
530 /* Figure out the type of the object pointed to. Set MEM_IN_STRUCT_P
531 if the value is the address of a structure or if the expression is
532 cast to a pointer to structure type. */
535 while (TREE_CODE (exp) == NOP_EXPR)
537 tree cast_type = TREE_TYPE (exp);
538 if (TREE_CODE (cast_type) == POINTER_TYPE
539 && AGGREGATE_TYPE_P (TREE_TYPE (cast_type)))
544 exp = TREE_OPERAND (exp, 0);
547 if (is_aggregate == 0)
551 if (TREE_CODE (exp) == ADDR_EXPR)
552 /* If this is the address of an object, check whether the
553 object is an array. */
554 type = TREE_TYPE (TREE_OPERAND (exp, 0));
556 type = TREE_TYPE (TREE_TYPE (exp));
557 is_aggregate = AGGREGATE_TYPE_P (type);
560 MEM_SET_IN_STRUCT_P (mem, is_aggregate);
564 /* Built-in functions to perform an untyped call and return. */
566 /* For each register that may be used for calling a function, this
567 gives a mode used to copy the register's value. VOIDmode indicates
568 the register is not used for calling a function. If the machine
569 has register windows, this gives only the outbound registers.
570 INCOMING_REGNO gives the corresponding inbound register. */
571 static enum machine_mode apply_args_mode[FIRST_PSEUDO_REGISTER];
573 /* For each register that may be used for returning values, this gives
574 a mode used to copy the register's value. VOIDmode indicates the
575 register is not used for returning values. If the machine has
576 register windows, this gives only the outbound registers.
577 INCOMING_REGNO gives the corresponding inbound register. */
578 static enum machine_mode apply_result_mode[FIRST_PSEUDO_REGISTER];
580 /* For each register that may be used for calling a function, this
581 gives the offset of that register into the block returned by
582 __builtin_apply_args. 0 indicates that the register is not
583 used for calling a function. */
584 static int apply_args_reg_offset[FIRST_PSEUDO_REGISTER];
586 /* Return the offset of register REGNO into the block returned by
587 __builtin_apply_args. This is not declared static, since it is
588 needed in objc-act.c. */
591 apply_args_register_offset (regno)
596 /* Arguments are always put in outgoing registers (in the argument
597 block) if such make sense. */
598 #ifdef OUTGOING_REGNO
599 regno = OUTGOING_REGNO(regno);
601 return apply_args_reg_offset[regno];
604 /* Return the size required for the block returned by __builtin_apply_args,
605 and initialize apply_args_mode. */
610 static int size = -1;
612 enum machine_mode mode;
614 /* The values computed by this function never change. */
617 /* The first value is the incoming arg-pointer. */
618 size = GET_MODE_SIZE (Pmode);
620 /* The second value is the structure value address unless this is
621 passed as an "invisible" first argument. */
622 if (struct_value_rtx)
623 size += GET_MODE_SIZE (Pmode);
625 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
626 if (FUNCTION_ARG_REGNO_P (regno))
628 /* Search for the proper mode for copying this register's
629 value. I'm not sure this is right, but it works so far. */
630 enum machine_mode best_mode = VOIDmode;
632 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
634 mode = GET_MODE_WIDER_MODE (mode))
635 if (HARD_REGNO_MODE_OK (regno, mode)
636 && HARD_REGNO_NREGS (regno, mode) == 1)
639 if (best_mode == VOIDmode)
640 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
642 mode = GET_MODE_WIDER_MODE (mode))
643 if (HARD_REGNO_MODE_OK (regno, mode)
644 && (mov_optab->handlers[(int) mode].insn_code
645 != CODE_FOR_nothing))
649 if (mode == VOIDmode)
652 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
653 if (size % align != 0)
654 size = CEIL (size, align) * align;
655 apply_args_reg_offset[regno] = size;
656 size += GET_MODE_SIZE (mode);
657 apply_args_mode[regno] = mode;
661 apply_args_mode[regno] = VOIDmode;
662 apply_args_reg_offset[regno] = 0;
668 /* Return the size required for the block returned by __builtin_apply,
669 and initialize apply_result_mode. */
674 static int size = -1;
676 enum machine_mode mode;
678 /* The values computed by this function never change. */
683 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
684 if (FUNCTION_VALUE_REGNO_P (regno))
686 /* Search for the proper mode for copying this register's
687 value. I'm not sure this is right, but it works so far. */
688 enum machine_mode best_mode = VOIDmode;
690 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
692 mode = GET_MODE_WIDER_MODE (mode))
693 if (HARD_REGNO_MODE_OK (regno, mode))
696 if (best_mode == VOIDmode)
697 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
699 mode = GET_MODE_WIDER_MODE (mode))
700 if (HARD_REGNO_MODE_OK (regno, mode)
701 && (mov_optab->handlers[(int) mode].insn_code
702 != CODE_FOR_nothing))
706 if (mode == VOIDmode)
709 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
710 if (size % align != 0)
711 size = CEIL (size, align) * align;
712 size += GET_MODE_SIZE (mode);
713 apply_result_mode[regno] = mode;
716 apply_result_mode[regno] = VOIDmode;
718 /* Allow targets that use untyped_call and untyped_return to override
719 the size so that machine-specific information can be stored here. */
720 #ifdef APPLY_RESULT_SIZE
721 size = APPLY_RESULT_SIZE;
727 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
728 /* Create a vector describing the result block RESULT. If SAVEP is true,
729 the result block is used to save the values; otherwise it is used to
730 restore the values. */
733 result_vector (savep, result)
737 int regno, size, align, nelts;
738 enum machine_mode mode;
740 rtx *savevec = (rtx *) alloca (FIRST_PSEUDO_REGISTER * sizeof (rtx));
743 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
744 if ((mode = apply_result_mode[regno]) != VOIDmode)
746 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
747 if (size % align != 0)
748 size = CEIL (size, align) * align;
749 reg = gen_rtx_REG (mode, savep ? regno : INCOMING_REGNO (regno));
750 mem = change_address (result, mode,
751 plus_constant (XEXP (result, 0), size));
752 savevec[nelts++] = (savep
753 ? gen_rtx_SET (VOIDmode, mem, reg)
754 : gen_rtx_SET (VOIDmode, reg, mem));
755 size += GET_MODE_SIZE (mode);
757 return gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (nelts, savevec));
759 #endif /* HAVE_untyped_call or HAVE_untyped_return */
761 /* Save the state required to perform an untyped call with the same
762 arguments as were passed to the current function. */
765 expand_builtin_apply_args_1 ()
768 int size, align, regno;
769 enum machine_mode mode;
771 /* Create a block where the arg-pointer, structure value address,
772 and argument registers can be saved. */
773 registers = assign_stack_local (BLKmode, apply_args_size (), -1);
775 /* Walk past the arg-pointer and structure value address. */
776 size = GET_MODE_SIZE (Pmode);
777 if (struct_value_rtx)
778 size += GET_MODE_SIZE (Pmode);
780 /* Save each register used in calling a function to the block. */
781 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
782 if ((mode = apply_args_mode[regno]) != VOIDmode)
786 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
787 if (size % align != 0)
788 size = CEIL (size, align) * align;
790 tem = gen_rtx_REG (mode, INCOMING_REGNO (regno));
792 emit_move_insn (change_address (registers, mode,
793 plus_constant (XEXP (registers, 0),
796 size += GET_MODE_SIZE (mode);
799 /* Save the arg pointer to the block. */
800 emit_move_insn (change_address (registers, Pmode, XEXP (registers, 0)),
801 copy_to_reg (virtual_incoming_args_rtx));
802 size = GET_MODE_SIZE (Pmode);
804 /* Save the structure value address unless this is passed as an
805 "invisible" first argument. */
806 if (struct_value_incoming_rtx)
808 emit_move_insn (change_address (registers, Pmode,
809 plus_constant (XEXP (registers, 0),
811 copy_to_reg (struct_value_incoming_rtx));
812 size += GET_MODE_SIZE (Pmode);
815 /* Return the address of the block. */
816 return copy_addr_to_reg (XEXP (registers, 0));
819 /* __builtin_apply_args returns block of memory allocated on
820 the stack into which is stored the arg pointer, structure
821 value address, static chain, and all the registers that might
822 possibly be used in performing a function call. The code is
823 moved to the start of the function so the incoming values are
826 expand_builtin_apply_args ()
828 /* Don't do __builtin_apply_args more than once in a function.
829 Save the result of the first call and reuse it. */
830 if (apply_args_value != 0)
831 return apply_args_value;
833 /* When this function is called, it means that registers must be
834 saved on entry to this function. So we migrate the
835 call to the first insn of this function. */
840 temp = expand_builtin_apply_args_1 ();
844 apply_args_value = temp;
846 /* Put the sequence after the NOTE that starts the function.
847 If this is inside a SEQUENCE, make the outer-level insn
848 chain current, so the code is placed at the start of the
850 push_topmost_sequence ();
851 emit_insns_before (seq, NEXT_INSN (get_insns ()));
852 pop_topmost_sequence ();
857 /* Perform an untyped call and save the state required to perform an
858 untyped return of whatever value was returned by the given function. */
861 expand_builtin_apply (function, arguments, argsize)
862 rtx function, arguments, argsize;
864 int size, align, regno;
865 enum machine_mode mode;
866 rtx incoming_args, result, reg, dest, call_insn;
867 rtx old_stack_level = 0;
870 /* Create a block where the return registers can be saved. */
871 result = assign_stack_local (BLKmode, apply_result_size (), -1);
873 /* ??? The argsize value should be adjusted here. */
875 /* Fetch the arg pointer from the ARGUMENTS block. */
876 incoming_args = gen_reg_rtx (Pmode);
877 emit_move_insn (incoming_args,
878 gen_rtx_MEM (Pmode, arguments));
879 #ifndef STACK_GROWS_DOWNWARD
880 incoming_args = expand_binop (Pmode, sub_optab, incoming_args, argsize,
881 incoming_args, 0, OPTAB_LIB_WIDEN);
884 /* Perform postincrements before actually calling the function. */
887 /* Push a new argument block and copy the arguments. */
888 do_pending_stack_adjust ();
890 /* Save the stack with nonlocal if available */
891 #ifdef HAVE_save_stack_nonlocal
892 if (HAVE_save_stack_nonlocal)
893 emit_stack_save (SAVE_NONLOCAL, &old_stack_level, NULL_RTX);
896 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
898 /* Push a block of memory onto the stack to store the memory arguments.
899 Save the address in a register, and copy the memory arguments. ??? I
900 haven't figured out how the calling convention macros effect this,
901 but it's likely that the source and/or destination addresses in
902 the block copy will need updating in machine specific ways. */
903 dest = allocate_dynamic_stack_space (argsize, 0, 0);
904 emit_block_move (gen_rtx_MEM (BLKmode, dest),
905 gen_rtx_MEM (BLKmode, incoming_args),
907 PARM_BOUNDARY / BITS_PER_UNIT);
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
1311 expand_builtin_strlen (exp, target, mode)
1314 enum machine_mode mode;
1316 tree arglist = TREE_OPERAND (exp, 1);
1317 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1320 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1321 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE)
1326 tree src = TREE_VALUE (arglist);
1327 tree len = c_strlen (src);
1330 = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1332 rtx result, src_reg, char_rtx, before_strlen;
1333 enum machine_mode insn_mode = value_mode, char_mode;
1334 enum insn_code icode = CODE_FOR_nothing;
1336 /* If the length is known, just return it. */
1338 return expand_expr (len, target, mode, EXPAND_MEMORY_USE_BAD);
1340 /* If SRC is not a pointer type, don't do this operation inline. */
1344 /* Bail out if we can't compute strlen in the right mode. */
1345 while (insn_mode != VOIDmode)
1347 icode = strlen_optab->handlers[(int) insn_mode].insn_code;
1348 if (icode != CODE_FOR_nothing)
1351 insn_mode = GET_MODE_WIDER_MODE (insn_mode);
1353 if (insn_mode == VOIDmode)
1356 /* Make a place to write the result of the instruction. */
1359 && GET_CODE (result) == REG
1360 && GET_MODE (result) == insn_mode
1361 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
1362 result = gen_reg_rtx (insn_mode);
1364 /* Make a place to hold the source address. We will not expand
1365 the actual source until we are sure that the expansion will
1366 not fail -- there are trees that cannot be expanded twice. */
1367 src_reg = gen_reg_rtx (Pmode);
1369 /* Mark the beginning of the strlen sequence so we can emit the
1370 source operand later. */
1371 before_strlen = get_last_insn();
1373 /* Check the string is readable and has an end. */
1374 if (current_function_check_memory_usage)
1375 emit_library_call (chkr_check_str_libfunc, 1, VOIDmode, 2,
1377 GEN_INT (MEMORY_USE_RO),
1378 TYPE_MODE (integer_type_node));
1380 char_rtx = const0_rtx;
1381 char_mode = insn_data[(int)icode].operand[2].mode;
1382 if (! (*insn_data[(int)icode].operand[2].predicate) (char_rtx, char_mode))
1383 char_rtx = copy_to_mode_reg (char_mode, char_rtx);
1385 pat = GEN_FCN (icode) (result, gen_rtx_MEM (BLKmode, src_reg),
1386 char_rtx, GEN_INT (align));
1391 /* Now that we are assured of success, expand the source. */
1393 pat = expand_expr (src, src_reg, ptr_mode, EXPAND_SUM);
1395 emit_move_insn (src_reg, pat);
1396 pat = gen_sequence ();
1400 emit_insn_after (pat, before_strlen);
1402 emit_insn_before (pat, get_insns ());
1404 /* Return the value in the proper mode for this function. */
1405 if (GET_MODE (result) == value_mode)
1407 else if (target != 0)
1408 convert_move (target, result, 0);
1410 target = convert_to_mode (value_mode, result, 0);
1416 /* Expand a call to the memcpy builtin, with arguments in ARGLIST. */
1418 expand_builtin_memcpy (arglist)
1422 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1423 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
1424 || TREE_CHAIN (arglist) == 0
1425 || (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist))))
1427 || TREE_CHAIN (TREE_CHAIN (arglist)) == 0
1428 || (TREE_CODE (TREE_TYPE (TREE_VALUE
1429 (TREE_CHAIN (TREE_CHAIN (arglist)))))
1434 tree dest = TREE_VALUE (arglist);
1435 tree src = TREE_VALUE (TREE_CHAIN (arglist));
1436 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1439 = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1441 = get_pointer_alignment (dest, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1442 rtx dest_mem, src_mem, dest_addr, len_rtx;
1444 /* If either SRC or DEST is not a pointer type, don't do
1445 this operation in-line. */
1446 if (src_align == 0 || dest_align == 0)
1449 dest_mem = get_memory_rtx (dest);
1450 src_mem = get_memory_rtx (src);
1451 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
1453 /* Just copy the rights of SRC to the rights of DEST. */
1454 if (current_function_check_memory_usage)
1455 emit_library_call (chkr_copy_bitmap_libfunc, 1, VOIDmode, 3,
1456 XEXP (dest_mem, 0), Pmode,
1457 XEXP (src_mem, 0), Pmode,
1458 len_rtx, TYPE_MODE (sizetype));
1460 /* Copy word part most expediently. */
1462 = emit_block_move (dest_mem, src_mem, len_rtx,
1463 MIN (src_align, dest_align));
1466 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
1472 /* Expand expression EXP, which is a call to the strcpy builtin. Return 0
1473 if we failed the caller should emit a normal call. */
1476 expand_builtin_strcpy (exp)
1479 tree arglist = TREE_OPERAND (exp, 1);
1483 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1484 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
1485 || TREE_CHAIN (arglist) == 0
1486 || (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist))))
1491 tree len = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
1496 len = size_binop (PLUS_EXPR, len, ssize_int (1));
1497 chainon (arglist, build_tree_list (NULL_TREE, len));
1500 result = expand_builtin_memcpy (arglist);
1503 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
1507 /* Expand expression EXP, which is a call to the memset builtin. Return 0
1508 if we failed the caller should emit a normal call. */
1511 expand_builtin_memset (exp)
1514 tree arglist = TREE_OPERAND (exp, 1);
1517 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1518 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
1519 || TREE_CHAIN (arglist) == 0
1520 || (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist))))
1522 || TREE_CHAIN (TREE_CHAIN (arglist)) == 0
1524 != (TREE_CODE (TREE_TYPE
1526 (TREE_CHAIN (TREE_CHAIN (arglist))))))))
1530 tree dest = TREE_VALUE (arglist);
1531 tree val = TREE_VALUE (TREE_CHAIN (arglist));
1532 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1535 = get_pointer_alignment (dest, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
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)
1635 else if (!HAVE_cmpstrsi)
1639 enum machine_mode mode;
1640 tree arg1 = TREE_VALUE (arglist);
1641 tree arg2 = TREE_VALUE (TREE_CHAIN (arglist));
1642 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
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 emit_insn (gen_cmpstrsi (result, get_memory_rtx (arg1),
1664 get_memory_rtx (arg2),
1665 expand_expr (len, NULL_RTX, VOIDmode, 0),
1666 GEN_INT (MIN (arg1_align, arg2_align))));
1668 /* Return the value in the proper mode for this function. */
1669 mode = TYPE_MODE (TREE_TYPE (exp));
1670 if (GET_MODE (result) == mode)
1672 else if (target != 0)
1674 convert_move (target, result, 0);
1678 return convert_to_mode (mode, result, 0);
1682 /* Expand expression EXP, which is a call to the strcmp builtin. Return 0
1683 if we failed the caller should emit a normal call, otherwise try to get
1684 the result in TARGET, if convenient. */
1687 expand_builtin_strcmp (exp, target)
1691 tree arglist = TREE_OPERAND (exp, 1);
1693 /* If we need to check memory accesses, call the library function. */
1694 if (current_function_check_memory_usage)
1698 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1699 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
1700 || TREE_CHAIN (arglist) == 0
1701 || (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist))))
1705 else if (! HAVE_cmpstrsi)
1708 tree arg1 = TREE_VALUE (arglist);
1709 tree arg2 = TREE_VALUE (TREE_CHAIN (arglist));
1710 tree len = c_strlen (arg1);
1711 tree len2 = c_strlen (arg2);
1715 len = size_binop (PLUS_EXPR, ssize_int (1), len);
1718 len2 = size_binop (PLUS_EXPR, ssize_int (1), len2);
1720 /* If we don't have a constant length for the first, use the length
1721 of the second, if we know it. We don't require a constant for
1722 this case; some cost analysis could be done if both are available
1723 but neither is constant. For now, assume they're equally cheap.
1725 If both strings have constant lengths, use the smaller. This
1726 could arise if optimization results in strcpy being called with
1727 two fixed strings, or if the code was machine-generated. We should
1728 add some code to the `memcmp' handler below to deal with such
1729 situations, someday. */
1731 if (!len || TREE_CODE (len) != INTEGER_CST)
1738 else if (len2 && TREE_CODE (len2) == INTEGER_CST
1739 && tree_int_cst_lt (len2, len))
1742 chainon (arglist, build_tree_list (NULL_TREE, len));
1743 result = expand_builtin_memcmp (exp, arglist, target);
1745 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
1752 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
1753 if that's convenient. */
1756 expand_builtin_saveregs ()
1760 /* Don't do __builtin_saveregs more than once in a function.
1761 Save the result of the first call and reuse it. */
1762 if (saveregs_value != 0)
1763 return saveregs_value;
1765 /* When this function is called, it means that registers must be
1766 saved on entry to this function. So we migrate the call to the
1767 first insn of this function. */
1771 #ifdef EXPAND_BUILTIN_SAVEREGS
1772 /* Do whatever the machine needs done in this case. */
1773 val = EXPAND_BUILTIN_SAVEREGS ();
1775 /* ??? We used to try and build up a call to the out of line function,
1776 guessing about what registers needed saving etc. This became much
1777 harder with __builtin_va_start, since we don't have a tree for a
1778 call to __builtin_saveregs to fall back on. There was exactly one
1779 port (i860) that used this code, and I'm unconvinced it could actually
1780 handle the general case. So we no longer try to handle anything
1781 weird and make the backend absorb the evil. */
1783 error ("__builtin_saveregs not supported by this target");
1790 saveregs_value = val;
1792 /* Put the sequence after the NOTE that starts the function. If this
1793 is inside a SEQUENCE, make the outer-level insn chain current, so
1794 the code is placed at the start of the function. */
1795 push_topmost_sequence ();
1796 emit_insns_after (seq, get_insns ());
1797 pop_topmost_sequence ();
1802 /* __builtin_args_info (N) returns word N of the arg space info
1803 for the current function. The number and meanings of words
1804 is controlled by the definition of CUMULATIVE_ARGS. */
1806 expand_builtin_args_info (exp)
1809 tree arglist = TREE_OPERAND (exp, 1);
1810 int nwords = sizeof (CUMULATIVE_ARGS) / sizeof (int);
1811 int *word_ptr = (int *) ¤t_function_args_info;
1813 /* These are used by the code below that is if 0'ed away */
1815 tree type, elts, result;
1818 if (sizeof (CUMULATIVE_ARGS) % sizeof (int) != 0)
1823 tree arg = TREE_VALUE (arglist);
1824 if (TREE_CODE (arg) != INTEGER_CST)
1825 error ("argument of `__builtin_args_info' must be constant");
1828 int wordnum = TREE_INT_CST_LOW (arg);
1830 if (wordnum < 0 || wordnum >= nwords || TREE_INT_CST_HIGH (arg))
1831 error ("argument of `__builtin_args_info' out of range");
1833 return GEN_INT (word_ptr[wordnum]);
1837 error ("missing argument in `__builtin_args_info'");
1842 for (i = 0; i < nwords; i++)
1843 elts = tree_cons (NULL_TREE, build_int_2 (word_ptr[i], 0));
1845 type = build_array_type (integer_type_node,
1846 build_index_type (build_int_2 (nwords, 0)));
1847 result = build (CONSTRUCTOR, type, NULL_TREE, nreverse (elts));
1848 TREE_CONSTANT (result) = 1;
1849 TREE_STATIC (result) = 1;
1850 result = build1 (INDIRECT_REF, build_pointer_type (type), result);
1851 TREE_CONSTANT (result) = 1;
1852 return expand_expr (result, NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD);
1856 /* Expand ARGLIST, from a call to __builtin_next_arg. */
1858 expand_builtin_next_arg (arglist)
1861 tree fntype = TREE_TYPE (current_function_decl);
1863 if ((TYPE_ARG_TYPES (fntype) == 0
1864 || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype)))
1866 && ! current_function_varargs)
1868 error ("`va_start' used in function with fixed args");
1874 tree last_parm = tree_last (DECL_ARGUMENTS (current_function_decl));
1875 tree arg = TREE_VALUE (arglist);
1877 /* Strip off all nops for the sake of the comparison. This
1878 is not quite the same as STRIP_NOPS. It does more.
1879 We must also strip off INDIRECT_EXPR for C++ reference
1881 while (TREE_CODE (arg) == NOP_EXPR
1882 || TREE_CODE (arg) == CONVERT_EXPR
1883 || TREE_CODE (arg) == NON_LVALUE_EXPR
1884 || TREE_CODE (arg) == INDIRECT_REF)
1885 arg = TREE_OPERAND (arg, 0);
1886 if (arg != last_parm)
1887 warning ("second parameter of `va_start' not last named argument");
1889 else if (! current_function_varargs)
1890 /* Evidently an out of date version of <stdarg.h>; can't validate
1891 va_start's second argument, but can still work as intended. */
1892 warning ("`__builtin_next_arg' called without an argument");
1894 return expand_binop (Pmode, add_optab,
1895 current_function_internal_arg_pointer,
1896 current_function_arg_offset_rtx,
1897 NULL_RTX, 0, OPTAB_LIB_WIDEN);
1900 /* Make it easier for the backends by protecting the valist argument
1901 from multiple evaluations. */
1904 stabilize_va_list (valist, needs_lvalue)
1908 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
1910 if (TREE_SIDE_EFFECTS (valist))
1911 valist = save_expr (valist);
1913 /* For this case, the backends will be expecting a pointer to
1914 TREE_TYPE (va_list_type_node), but it's possible we've
1915 actually been given an array (an actual va_list_type_node).
1917 if (TREE_CODE (TREE_TYPE (valist)) == ARRAY_TYPE)
1919 tree p1 = build_pointer_type (TREE_TYPE (va_list_type_node));
1920 tree p2 = build_pointer_type (va_list_type_node);
1921 valist = build1 (ADDR_EXPR, p2, valist);
1922 valist = fold (build1 (NOP_EXPR, p1, valist));
1931 if (! TREE_SIDE_EFFECTS (valist))
1934 pt = build_pointer_type (va_list_type_node);
1935 valist = fold (build1 (ADDR_EXPR, pt, valist));
1936 TREE_SIDE_EFFECTS (valist) = 1;
1939 if (TREE_SIDE_EFFECTS (valist))
1940 valist = save_expr (valist);
1941 valist = fold (build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (valist)),
1948 /* The "standard" implementation of va_start: just assign `nextarg' to
1951 std_expand_builtin_va_start (stdarg_p, valist, nextarg)
1952 int stdarg_p ATTRIBUTE_UNUSED;
1959 nextarg = plus_constant (nextarg, -UNITS_PER_WORD);
1961 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
1962 make_tree (ptr_type_node, nextarg));
1963 TREE_SIDE_EFFECTS (t) = 1;
1965 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
1968 /* Expand ARGLIST, which from a call to __builtin_stdarg_va_start or
1969 __builtin_varargs_va_start, depending on STDARG_P. */
1971 expand_builtin_va_start (stdarg_p, arglist)
1976 tree chain = arglist, valist;
1979 nextarg = expand_builtin_next_arg (chain = TREE_CHAIN (arglist));
1981 nextarg = expand_builtin_next_arg (NULL_TREE);
1983 if (TREE_CHAIN (chain))
1984 error ("too many arguments to function `va_start'");
1986 valist = stabilize_va_list (TREE_VALUE (arglist), 1);
1988 #ifdef EXPAND_BUILTIN_VA_START
1989 EXPAND_BUILTIN_VA_START (stdarg_p, valist, nextarg);
1991 std_expand_builtin_va_start (stdarg_p, valist, nextarg);
1997 /* Allocate an alias set for use in storing and reading from the varargs
2000 get_varargs_alias_set ()
2002 static int set = -1;
2004 set = new_alias_set ();
2008 /* The "standard" implementation of va_arg: read the value from the
2009 current (padded) address and increment by the (padded) size. */
2011 std_expand_builtin_va_arg (valist, type)
2015 HOST_WIDE_INT align;
2016 HOST_WIDE_INT rounded_size;
2019 /* Compute the rounded size of the type. */
2020 align = PARM_BOUNDARY / BITS_PER_UNIT;
2021 rounded_size = (((int_size_in_bytes (type) + align - 1) / align) * align);
2025 if (PAD_VARARGS_DOWN)
2027 /* Small args are padded downward. */
2030 adj = TREE_INT_CST_LOW (TYPE_SIZE (type)) / BITS_PER_UNIT;
2031 if (rounded_size > align)
2034 addr_tree = build (PLUS_EXPR, TREE_TYPE (addr_tree), addr_tree,
2035 build_int_2 (rounded_size - adj, 0));
2038 addr = expand_expr (addr_tree, NULL_RTX, Pmode, EXPAND_NORMAL);
2039 addr = copy_to_reg (addr);
2041 /* Compute new value for AP. */
2042 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
2043 build (PLUS_EXPR, TREE_TYPE (valist), valist,
2044 build_int_2 (rounded_size, 0)));
2045 TREE_SIDE_EFFECTS (t) = 1;
2046 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2051 /* Expand __builtin_va_arg, which is not really a builtin function, but
2052 a very special sort of operator. */
2054 expand_builtin_va_arg (valist, type)
2058 tree promoted_type, want_va_type, have_va_type;
2060 /* Verify that valist is of the proper type. */
2062 want_va_type = va_list_type_node;
2063 have_va_type = TREE_TYPE (valist);
2064 if (TREE_CODE (want_va_type) == ARRAY_TYPE)
2066 /* If va_list is an array type, the argument may have decayed
2067 to a pointer type, e.g. by being passed to another function.
2068 In that case, unwrap both types so that we can compare the
2069 underlying records. */
2070 if (TREE_CODE (have_va_type) == ARRAY_TYPE
2071 || TREE_CODE (have_va_type) == POINTER_TYPE)
2073 want_va_type = TREE_TYPE (want_va_type);
2074 have_va_type = TREE_TYPE (have_va_type);
2077 if (TYPE_MAIN_VARIANT (want_va_type) != TYPE_MAIN_VARIANT (have_va_type))
2079 error ("first argument to `va_arg' not of type `va_list'");
2083 /* Generate a diagnostic for requesting data of a type that cannot
2084 be passed through `...' due to type promotion at the call site. */
2085 else if ((promoted_type = (*lang_type_promotes_to) (type)) != NULL_TREE)
2087 const char *name = "<anonymous type>", *pname = 0;
2088 static int gave_help;
2090 if (TYPE_NAME (type))
2092 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
2093 name = IDENTIFIER_POINTER (TYPE_NAME (type));
2094 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
2095 && DECL_NAME (TYPE_NAME (type)))
2096 name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
2098 if (TYPE_NAME (promoted_type))
2100 if (TREE_CODE (TYPE_NAME (promoted_type)) == IDENTIFIER_NODE)
2101 pname = IDENTIFIER_POINTER (TYPE_NAME (promoted_type));
2102 else if (TREE_CODE (TYPE_NAME (promoted_type)) == TYPE_DECL
2103 && DECL_NAME (TYPE_NAME (promoted_type)))
2104 pname = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (promoted_type)));
2107 error ("`%s' is promoted to `%s' when passed through `...'", name, pname);
2111 error ("(so you should pass `%s' not `%s' to `va_arg')", pname, name);
2118 /* Make it easier for the backends by protecting the valist argument
2119 from multiple evaluations. */
2120 valist = stabilize_va_list (valist, 0);
2122 #ifdef EXPAND_BUILTIN_VA_ARG
2123 addr = EXPAND_BUILTIN_VA_ARG (valist, type);
2125 addr = std_expand_builtin_va_arg (valist, type);
2129 result = gen_rtx_MEM (TYPE_MODE (type), addr);
2130 MEM_ALIAS_SET (result) = get_varargs_alias_set ();
2135 /* Expand ARGLIST, from a call to __builtin_va_end. */
2137 expand_builtin_va_end (arglist)
2140 tree valist = TREE_VALUE (arglist);
2142 #ifdef EXPAND_BUILTIN_VA_END
2143 valist = stabilize_va_list (valist, 0);
2144 EXPAND_BUILTIN_VA_END(arglist);
2146 /* Evaluate for side effects, if needed. I hate macros that don't
2148 if (TREE_SIDE_EFFECTS (valist))
2149 expand_expr (valist, const0_rtx, VOIDmode, EXPAND_NORMAL);
2155 /* Expand ARGLIST, from a call to __builtin_va_copy. We do this as a
2156 builtin rather than just as an assignment in stdarg.h because of the
2157 nastiness of array-type va_list types. */
2159 expand_builtin_va_copy (arglist)
2164 dst = TREE_VALUE (arglist);
2165 src = TREE_VALUE (TREE_CHAIN (arglist));
2167 dst = stabilize_va_list (dst, 1);
2168 src = stabilize_va_list (src, 0);
2170 if (TREE_CODE (va_list_type_node) != ARRAY_TYPE)
2172 t = build (MODIFY_EXPR, va_list_type_node, dst, src);
2173 TREE_SIDE_EFFECTS (t) = 1;
2174 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2178 rtx dstb, srcb, size;
2180 /* Evaluate to pointers. */
2181 dstb = expand_expr (dst, NULL_RTX, Pmode, EXPAND_NORMAL);
2182 srcb = expand_expr (src, NULL_RTX, Pmode, EXPAND_NORMAL);
2183 size = expand_expr (TYPE_SIZE_UNIT (va_list_type_node), NULL_RTX,
2184 VOIDmode, EXPAND_NORMAL);
2186 /* "Dereference" to BLKmode memories. */
2187 dstb = gen_rtx_MEM (BLKmode, dstb);
2188 MEM_ALIAS_SET (dstb) = get_alias_set (TREE_TYPE (TREE_TYPE (dst)));
2189 srcb = gen_rtx_MEM (BLKmode, srcb);
2190 MEM_ALIAS_SET (srcb) = get_alias_set (TREE_TYPE (TREE_TYPE (src)));
2193 emit_block_move (dstb, srcb, size,
2194 TYPE_ALIGN (va_list_type_node) / BITS_PER_UNIT);
2200 /* Expand a call to one of the builtin functions __builtin_frame_address or
2201 __builtin_return_address. */
2203 expand_builtin_frame_address (exp)
2206 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
2207 tree arglist = TREE_OPERAND (exp, 1);
2209 /* The argument must be a nonnegative integer constant.
2210 It counts the number of frames to scan up the stack.
2211 The value is the return address saved in that frame. */
2213 /* Warning about missing arg was already issued. */
2215 else if (TREE_CODE (TREE_VALUE (arglist)) != INTEGER_CST
2216 || tree_int_cst_sgn (TREE_VALUE (arglist)) < 0)
2218 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
2219 error ("invalid arg to `__builtin_frame_address'");
2221 error ("invalid arg to `__builtin_return_address'");
2226 rtx tem = expand_builtin_return_addr (DECL_FUNCTION_CODE (fndecl),
2227 TREE_INT_CST_LOW (TREE_VALUE (arglist)),
2228 hard_frame_pointer_rtx);
2230 /* Some ports cannot access arbitrary stack frames. */
2233 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
2234 warning ("unsupported arg to `__builtin_frame_address'");
2236 warning ("unsupported arg to `__builtin_return_address'");
2240 /* For __builtin_frame_address, return what we've got. */
2241 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
2244 if (GET_CODE (tem) != REG
2245 && ! CONSTANT_P (tem))
2246 tem = copy_to_mode_reg (Pmode, tem);
2251 /* Expand a call to the alloca builtin, with arguments ARGLIST. Return 0 if
2252 we failed and the caller should emit a normal call, otherwise try to get
2253 the result in TARGET, if convenient. */
2255 expand_builtin_alloca (arglist, target)
2262 /* Arg could be non-integer if user redeclared this fcn wrong. */
2263 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != INTEGER_TYPE)
2266 /* Compute the argument. */
2267 op0 = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
2269 /* Allocate the desired space. */
2270 return allocate_dynamic_stack_space (op0, target, BITS_PER_UNIT);
2273 /* Expand a call to the ffs builtin. The arguments are in ARGLIST.
2274 Return 0 if a normal call should be emitted rather than expanding the
2275 function in-line. If convenient, the result should be placed in TARGET.
2276 SUBTARGET may be used as the target for computing one of EXP's operands. */
2278 expand_builtin_ffs (arglist, target, subtarget)
2280 rtx target, subtarget;
2284 /* Arg could be non-integer if user redeclared this fcn wrong. */
2285 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != INTEGER_TYPE)
2288 /* Compute the argument. */
2289 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
2290 /* Compute ffs, into TARGET if possible.
2291 Set TARGET to wherever the result comes back. */
2292 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
2293 ffs_optab, op0, target, 1);
2299 /* Expand an expression EXP that calls a built-in function,
2300 with result going to TARGET if that's convenient
2301 (and in mode MODE if that's convenient).
2302 SUBTARGET may be used as the target for computing one of EXP's operands.
2303 IGNORE is nonzero if the value is to be ignored. */
2306 expand_builtin (exp, target, subtarget, mode, ignore)
2310 enum machine_mode mode;
2313 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
2314 tree arglist = TREE_OPERAND (exp, 1);
2315 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
2317 #ifdef MD_EXPAND_BUILTIN
2318 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
2319 return MD_EXPAND_BUILTIN (exp, target, subtarget, mode, ignore);
2322 /* When not optimizing, generate calls to library functions for a certain
2324 if (! optimize && ! CALLED_AS_BUILT_IN (fndecl)
2325 && (fcode == BUILT_IN_SIN || fcode == BUILT_IN_COS
2326 || fcode == BUILT_IN_FSQRT || fcode == BUILT_IN_MEMSET
2327 || fcode == BUILT_IN_MEMCPY || fcode == BUILT_IN_MEMCMP
2328 || fcode == BUILT_IN_BCMP || fcode == BUILT_IN_BZERO
2329 || fcode == BUILT_IN_STRLEN || fcode == BUILT_IN_STRCPY
2330 || fcode == BUILT_IN_STRCMP || fcode == BUILT_IN_FFS))
2331 return expand_call (exp, target, ignore);
2338 /* build_function_call changes these into ABS_EXPR. */
2343 /* Treat these like sqrt, but only if the user asks for them. */
2344 if (! flag_fast_math)
2346 case BUILT_IN_FSQRT:
2347 target = expand_builtin_mathfn (exp, target, subtarget);
2355 case BUILT_IN_APPLY_ARGS:
2356 return expand_builtin_apply_args ();
2358 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
2359 FUNCTION with a copy of the parameters described by
2360 ARGUMENTS, and ARGSIZE. It returns a block of memory
2361 allocated on the stack into which is stored all the registers
2362 that might possibly be used for returning the result of a
2363 function. ARGUMENTS is the value returned by
2364 __builtin_apply_args. ARGSIZE is the number of bytes of
2365 arguments that must be copied. ??? How should this value be
2366 computed? We'll also need a safe worst case value for varargs
2368 case BUILT_IN_APPLY:
2370 /* Arg could be non-pointer if user redeclared this fcn wrong. */
2371 || ! POINTER_TYPE_P (TREE_TYPE (TREE_VALUE (arglist)))
2372 || TREE_CHAIN (arglist) == 0
2373 || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) != POINTER_TYPE
2374 || TREE_CHAIN (TREE_CHAIN (arglist)) == 0
2375 || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))))) != INTEGER_TYPE)
2383 for (t = arglist, i = 0; t; t = TREE_CHAIN (t), i++)
2384 ops[i] = expand_expr (TREE_VALUE (t), NULL_RTX, VOIDmode, 0);
2386 return expand_builtin_apply (ops[0], ops[1], ops[2]);
2389 /* __builtin_return (RESULT) causes the function to return the
2390 value described by RESULT. RESULT is address of the block of
2391 memory returned by __builtin_apply. */
2392 case BUILT_IN_RETURN:
2394 /* Arg could be non-pointer if user redeclared this fcn wrong. */
2395 && TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) == POINTER_TYPE)
2396 expand_builtin_return (expand_expr (TREE_VALUE (arglist),
2397 NULL_RTX, VOIDmode, 0));
2400 case BUILT_IN_SAVEREGS:
2401 return expand_builtin_saveregs ();
2403 case BUILT_IN_ARGS_INFO:
2404 return expand_builtin_args_info (exp);
2406 /* Return the address of the first anonymous stack arg. */
2407 case BUILT_IN_NEXT_ARG:
2408 return expand_builtin_next_arg (arglist);
2410 case BUILT_IN_CLASSIFY_TYPE:
2411 return expand_builtin_classify_type (arglist);
2413 case BUILT_IN_CONSTANT_P:
2414 return expand_builtin_constant_p (exp);
2416 case BUILT_IN_FRAME_ADDRESS:
2417 case BUILT_IN_RETURN_ADDRESS:
2418 return expand_builtin_frame_address (exp);
2420 /* Returns the address of the area where the structure is returned.
2422 case BUILT_IN_AGGREGATE_INCOMING_ADDRESS:
2424 || ! AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl)))
2425 || GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl))) != MEM)
2428 return XEXP (DECL_RTL (DECL_RESULT (current_function_decl)), 0);
2430 case BUILT_IN_ALLOCA:
2431 target = expand_builtin_alloca (arglist, target);
2437 target = expand_builtin_ffs (arglist, target, subtarget);
2442 case BUILT_IN_STRLEN:
2443 target = expand_builtin_strlen (exp, target, mode);
2448 case BUILT_IN_STRCPY:
2449 target = expand_builtin_strcpy (exp);
2454 case BUILT_IN_MEMCPY:
2455 target = expand_builtin_memcpy (arglist);
2460 case BUILT_IN_MEMSET:
2461 target = expand_builtin_memset (exp);
2466 case BUILT_IN_BZERO:
2467 target = expand_builtin_bzero (exp);
2472 /* These comparison functions need an instruction that returns an actual
2473 index. An ordinary compare that just sets the condition codes
2475 #ifdef HAVE_cmpstrsi
2476 case BUILT_IN_STRCMP:
2477 target = expand_builtin_strcmp (exp, target);
2483 case BUILT_IN_MEMCMP:
2484 target = expand_builtin_memcmp (exp, arglist, target);
2489 case BUILT_IN_STRCMP:
2491 case BUILT_IN_MEMCMP:
2495 case BUILT_IN_SETJMP:
2497 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE)
2501 rtx buf_addr = expand_expr (TREE_VALUE (arglist), subtarget,
2503 rtx lab = gen_label_rtx ();
2504 rtx ret = expand_builtin_setjmp (buf_addr, target, lab, lab);
2509 /* __builtin_longjmp is passed a pointer to an array of five words.
2510 It's similar to the C library longjmp function but works with
2511 __builtin_setjmp above. */
2512 case BUILT_IN_LONGJMP:
2513 if (arglist == 0 || TREE_CHAIN (arglist) == 0
2514 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE)
2518 rtx buf_addr = expand_expr (TREE_VALUE (arglist), subtarget,
2520 rtx value = expand_expr (TREE_VALUE (TREE_CHAIN (arglist)),
2521 NULL_RTX, VOIDmode, 0);
2523 if (value != const1_rtx)
2525 error ("__builtin_longjmp second argument must be 1");
2529 expand_builtin_longjmp (buf_addr, value);
2536 emit_insn (gen_trap ());
2539 error ("__builtin_trap not supported by this target");
2543 /* Various hooks for the DWARF 2 __throw routine. */
2544 case BUILT_IN_UNWIND_INIT:
2545 expand_builtin_unwind_init ();
2547 case BUILT_IN_DWARF_CFA:
2548 return virtual_cfa_rtx;
2549 #ifdef DWARF2_UNWIND_INFO
2550 case BUILT_IN_DWARF_FP_REGNUM:
2551 return expand_builtin_dwarf_fp_regnum ();
2552 case BUILT_IN_INIT_DWARF_REG_SIZES:
2553 expand_builtin_init_dwarf_reg_sizes (TREE_VALUE (arglist));
2556 case BUILT_IN_FROB_RETURN_ADDR:
2557 return expand_builtin_frob_return_addr (TREE_VALUE (arglist));
2558 case BUILT_IN_EXTRACT_RETURN_ADDR:
2559 return expand_builtin_extract_return_addr (TREE_VALUE (arglist));
2560 case BUILT_IN_EH_RETURN:
2561 expand_builtin_eh_return (TREE_VALUE (arglist),
2562 TREE_VALUE (TREE_CHAIN (arglist)),
2563 TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))));
2565 case BUILT_IN_VARARGS_START:
2566 return expand_builtin_va_start (0, arglist);
2567 case BUILT_IN_STDARG_START:
2568 return expand_builtin_va_start (1, arglist);
2569 case BUILT_IN_VA_END:
2570 return expand_builtin_va_end (arglist);
2571 case BUILT_IN_VA_COPY:
2572 return expand_builtin_va_copy (arglist);
2574 default: /* just do library call, if unknown builtin */
2575 error ("built-in function `%s' not currently supported",
2576 IDENTIFIER_POINTER (DECL_NAME (fndecl)));
2579 /* The switch statement above can drop through to cause the function
2580 to be called normally. */
2581 return expand_call (exp, target, ignore);