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 const char *const built_in_names[(int) END_BUILTINS] =
64 {"BUILT_IN_ALLOCA", "BUILT_IN_ABS", "BUILT_IN_FABS", "BUILT_IN_LABS",
65 "BUILT_IN_FFS", "BUILT_IN_DIV", "BUILT_IN_LDIV", "BUILT_IN_FFLOOR",
66 "BUILT_IN_FCEIL", "BUILT_IN_FMOD", "BUILT_IN_FREM", "BUILT_IN_MEMCPY",
67 "BUILT_IN_MEMCMP", "BUILT_IN_MEMSET", "BUILT_IN_STRCPY", "BUILT_IN_STRCMP",
68 "BUILT_IN_STRLEN", "BUILT_IN_FSQRT", "BUILT_IN_SIN", "BUILT_IN_COS",
69 "BUILT_IN_GETEXP", "BUILT_IN_GETMAN", "BUILT_IN_SAVEREGS",
70 "BUILT_IN_CLASSIFY_TYPE", "BUILT_IN_NEXT_ARG", "BUILT_IN_ARGS_INFO",
71 "BUILT_IN_CONSTANT_P", "BUILT_IN_FRAME_ADDRESS", "BUILT_IN_RETURN_ADDRESS",
72 "BUILT_IN_AGGREGATE_INCOMING_ADDRESS", "BUILT_IN_APPLY_ARGS",
73 "BUILT_IN_APPLY", "BUILT_IN_RETURN", "BUILT_IN_SETJMP", "BUILT_IN_LONGJMP",
74 "BUILT_IN_TRAP", "BUILT_IN_ISGREATER", "BUILT_IN_ISGREATEREQUAL",
75 "BUILT_IN_ISLESS", "BUILT_IN_ISLESSEQUAL", "BUILT_IN_ISLESSGREATER",
76 "BUILT_IN_ISUNORDERED", "BUILT_IN_UNWIND_INIT", "BUILT_IN_DWARF_CFA",
77 "BUILT_IN_DWARF_FP_REGNUM", "BUILT_IN_INIT_DWARF_REG_SIZES",
78 "BUILT_IN_FROB_RETURN_ADDR", "BUILT_IN_EXTRACT_RETURN_ADDR",
79 "BUILT_IN_EH_RETURN", "BUILT_IN_VARARGS_START", "BUILT_IN_STDARG_START",
80 "BUILT_IN_VA_END", "BUILT_IN_VA_COPY", "BUILT_IN_NEW", "BUILT_IN_VEC_NEW",
81 "BUILT_IN_DELETE", "BUILT_IN_VEC_DELETE" };
83 tree (*lang_type_promotes_to) PARAMS ((tree));
85 static int get_pointer_alignment PARAMS ((tree, unsigned));
86 static tree c_strlen PARAMS ((tree));
87 static rtx get_memory_rtx PARAMS ((tree));
88 static int apply_args_size PARAMS ((void));
89 static int apply_result_size PARAMS ((void));
90 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
91 static rtx result_vector PARAMS ((int, rtx));
93 static rtx expand_builtin_apply_args PARAMS ((void));
94 static rtx expand_builtin_apply_args_1 PARAMS ((void));
95 static rtx expand_builtin_apply PARAMS ((rtx, rtx, rtx));
96 static void expand_builtin_return PARAMS ((rtx));
97 static rtx expand_builtin_classify_type PARAMS ((tree));
98 static rtx expand_builtin_mathfn PARAMS ((tree, rtx, rtx));
99 static rtx expand_builtin_constant_p PARAMS ((tree));
100 static rtx expand_builtin_args_info PARAMS ((tree));
101 static rtx expand_builtin_next_arg PARAMS ((tree));
102 static rtx expand_builtin_va_start PARAMS ((int, tree));
103 static rtx expand_builtin_va_end PARAMS ((tree));
104 static rtx expand_builtin_va_copy PARAMS ((tree));
106 static rtx expand_builtin_memcmp PARAMS ((tree, tree, rtx));
107 static rtx expand_builtin_strcmp PARAMS ((tree, rtx));
109 static rtx expand_builtin_memcpy PARAMS ((tree));
110 static rtx expand_builtin_strcpy PARAMS ((tree));
111 static rtx expand_builtin_memset PARAMS ((tree));
112 static rtx expand_builtin_strlen PARAMS ((tree, rtx,
114 static rtx expand_builtin_alloca PARAMS ((tree, rtx));
115 static rtx expand_builtin_ffs PARAMS ((tree, rtx, rtx));
116 static rtx expand_builtin_frame_address PARAMS ((tree));
117 static tree stabilize_va_list PARAMS ((tree, int));
119 /* Return the alignment in bits of EXP, a pointer valued expression.
120 But don't return more than MAX_ALIGN no matter what.
121 The alignment returned is, by default, the alignment of the thing that
122 EXP points to (if it is not a POINTER_TYPE, 0 is returned).
124 Otherwise, look at the expression to see if we can do better, i.e., if the
125 expression is actually pointing at an object whose alignment is tighter. */
128 get_pointer_alignment (exp, max_align)
132 unsigned align, inner;
134 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
137 align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
138 align = MIN (align, max_align);
142 switch (TREE_CODE (exp))
146 case NON_LVALUE_EXPR:
147 exp = TREE_OPERAND (exp, 0);
148 if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
150 inner = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
151 align = MIN (inner, max_align);
155 /* If sum of pointer + int, restrict our maximum alignment to that
156 imposed by the integer. If not, we can't do any better than
158 if (TREE_CODE (TREE_OPERAND (exp, 1)) != INTEGER_CST)
161 while (((TREE_INT_CST_LOW (TREE_OPERAND (exp, 1)) * BITS_PER_UNIT)
166 exp = TREE_OPERAND (exp, 0);
170 /* See what we are pointing at and look at its alignment. */
171 exp = TREE_OPERAND (exp, 0);
172 if (TREE_CODE (exp) == FUNCTION_DECL)
173 align = FUNCTION_BOUNDARY;
174 else if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'd')
175 align = DECL_ALIGN (exp);
176 #ifdef CONSTANT_ALIGNMENT
177 else if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'c')
178 align = CONSTANT_ALIGNMENT (exp, align);
180 return MIN (align, max_align);
188 /* Compute the length of a C string. TREE_STRING_LENGTH is not the right
189 way, because it could contain a zero byte in the middle.
190 TREE_STRING_LENGTH is the size of the character array, not the string.
192 The value returned is of type `ssizetype'.
194 Unfortunately, string_constant can't access the values of const char
195 arrays with initializers, so neither can we do so here. */
205 src = string_constant (src, &offset_node);
209 max = TREE_STRING_LENGTH (src);
210 ptr = TREE_STRING_POINTER (src);
212 if (offset_node && TREE_CODE (offset_node) != INTEGER_CST)
214 /* If the string has an internal zero byte (e.g., "foo\0bar"), we can't
215 compute the offset to the following null if we don't know where to
216 start searching for it. */
219 for (i = 0; i < max; i++)
223 /* We don't know the starting offset, but we do know that the string
224 has no internal zero bytes. We can assume that the offset falls
225 within the bounds of the string; otherwise, the programmer deserves
226 what he gets. Subtract the offset from the length of the string,
227 and return that. This would perhaps not be valid if we were dealing
228 with named arrays in addition to literal string constants. */
230 return size_diffop (size_int (max), offset_node);
233 /* We have a known offset into the string. Start searching there for
235 if (offset_node == 0)
239 /* Did we get a long long offset? If so, punt. */
240 if (TREE_INT_CST_HIGH (offset_node) != 0)
242 offset = TREE_INT_CST_LOW (offset_node);
245 /* If the offset is known to be out of bounds, warn, and call strlen at
247 if (offset < 0 || offset > max)
249 warning ("offset outside bounds of constant string");
253 /* Use strlen to search for the first zero byte. Since any strings
254 constructed with build_string will have nulls appended, we win even
255 if we get handed something like (char[4])"abcd".
257 Since OFFSET is our starting index into the string, no further
258 calculation is needed. */
259 return ssize_int (strlen (ptr + offset));
262 /* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
263 times to get the address of either a higher stack frame, or a return
264 address located within it (depending on FNDECL_CODE). */
267 expand_builtin_return_addr (fndecl_code, count, tem)
268 enum built_in_function fndecl_code;
274 /* Some machines need special handling before we can access
275 arbitrary frames. For example, on the sparc, we must first flush
276 all register windows to the stack. */
277 #ifdef SETUP_FRAME_ADDRESSES
279 SETUP_FRAME_ADDRESSES ();
282 /* On the sparc, the return address is not in the frame, it is in a
283 register. There is no way to access it off of the current frame
284 pointer, but it can be accessed off the previous frame pointer by
285 reading the value from the register window save area. */
286 #ifdef RETURN_ADDR_IN_PREVIOUS_FRAME
287 if (fndecl_code == BUILT_IN_RETURN_ADDRESS)
291 /* Scan back COUNT frames to the specified frame. */
292 for (i = 0; i < count; i++)
294 /* Assume the dynamic chain pointer is in the word that the
295 frame address points to, unless otherwise specified. */
296 #ifdef DYNAMIC_CHAIN_ADDRESS
297 tem = DYNAMIC_CHAIN_ADDRESS (tem);
299 tem = memory_address (Pmode, tem);
300 tem = copy_to_reg (gen_rtx_MEM (Pmode, tem));
303 /* For __builtin_frame_address, return what we've got. */
304 if (fndecl_code == BUILT_IN_FRAME_ADDRESS)
307 /* For __builtin_return_address, Get the return address from that
309 #ifdef RETURN_ADDR_RTX
310 tem = RETURN_ADDR_RTX (count, tem);
312 tem = memory_address (Pmode,
313 plus_constant (tem, GET_MODE_SIZE (Pmode)));
314 tem = gen_rtx_MEM (Pmode, tem);
319 /* __builtin_setjmp is passed a pointer to an array of five words (not
320 all will be used on all machines). It operates similarly to the C
321 library function of the same name, but is more efficient. Much of
322 the code below (and for longjmp) is copied from the handling of
325 NOTE: This is intended for use by GNAT and the exception handling
326 scheme in the compiler and will only work in the method used by
330 expand_builtin_setjmp (buf_addr, target, first_label, next_label)
333 rtx first_label, next_label;
335 rtx lab1 = gen_label_rtx ();
336 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
337 enum machine_mode value_mode;
340 value_mode = TYPE_MODE (integer_type_node);
342 #ifdef POINTERS_EXTEND_UNSIGNED
343 buf_addr = convert_memory_address (Pmode, buf_addr);
346 buf_addr = force_reg (Pmode, force_operand (buf_addr, NULL_RTX));
348 if (target == 0 || GET_CODE (target) != REG
349 || REGNO (target) < FIRST_PSEUDO_REGISTER)
350 target = gen_reg_rtx (value_mode);
354 /* We store the frame pointer and the address of lab1 in the buffer
355 and use the rest of it for the stack save area, which is
356 machine-dependent. */
358 #ifndef BUILTIN_SETJMP_FRAME_VALUE
359 #define BUILTIN_SETJMP_FRAME_VALUE virtual_stack_vars_rtx
362 emit_move_insn (gen_rtx_MEM (Pmode, buf_addr),
363 BUILTIN_SETJMP_FRAME_VALUE);
364 emit_move_insn (validize_mem
366 plus_constant (buf_addr,
367 GET_MODE_SIZE (Pmode)))),
368 force_reg (Pmode, gen_rtx_LABEL_REF (Pmode, lab1)));
370 stack_save = gen_rtx_MEM (sa_mode,
371 plus_constant (buf_addr,
372 2 * GET_MODE_SIZE (Pmode)));
373 emit_stack_save (SAVE_NONLOCAL, &stack_save, NULL_RTX);
375 /* If there is further processing to do, do it. */
376 #ifdef HAVE_builtin_setjmp_setup
377 if (HAVE_builtin_setjmp_setup)
378 emit_insn (gen_builtin_setjmp_setup (buf_addr));
381 /* Set TARGET to zero and branch to the first-time-through label. */
382 emit_move_insn (target, const0_rtx);
383 emit_jump_insn (gen_jump (first_label));
387 /* Tell flow about the strange goings on. Putting `lab1' on
388 `nonlocal_goto_handler_labels' to indicates that function
389 calls may traverse the arc back to this label. */
391 current_function_has_nonlocal_label = 1;
392 nonlocal_goto_handler_labels =
393 gen_rtx_EXPR_LIST (VOIDmode, lab1, nonlocal_goto_handler_labels);
395 /* Clobber the FP when we get here, so we have to make sure it's
396 marked as used by this function. */
397 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
399 /* Mark the static chain as clobbered here so life information
400 doesn't get messed up for it. */
401 emit_insn (gen_rtx_CLOBBER (VOIDmode, static_chain_rtx));
403 /* Now put in the code to restore the frame pointer, and argument
404 pointer, if needed. The code below is from expand_end_bindings
405 in stmt.c; see detailed documentation there. */
406 #ifdef HAVE_nonlocal_goto
407 if (! HAVE_nonlocal_goto)
409 emit_move_insn (virtual_stack_vars_rtx, hard_frame_pointer_rtx);
411 #if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
412 if (fixed_regs[ARG_POINTER_REGNUM])
414 #ifdef ELIMINABLE_REGS
416 static struct elims {int from, to;} elim_regs[] = ELIMINABLE_REGS;
418 for (i = 0; i < sizeof elim_regs / sizeof elim_regs[0]; i++)
419 if (elim_regs[i].from == ARG_POINTER_REGNUM
420 && elim_regs[i].to == HARD_FRAME_POINTER_REGNUM)
423 if (i == sizeof elim_regs / sizeof elim_regs [0])
426 /* Now restore our arg pointer from the address at which it
427 was saved in our stack frame.
428 If there hasn't be space allocated for it yet, make
430 if (arg_pointer_save_area == 0)
431 arg_pointer_save_area
432 = assign_stack_local (Pmode, GET_MODE_SIZE (Pmode), 0);
433 emit_move_insn (virtual_incoming_args_rtx,
434 copy_to_reg (arg_pointer_save_area));
439 #ifdef HAVE_builtin_setjmp_receiver
440 if (HAVE_builtin_setjmp_receiver)
441 emit_insn (gen_builtin_setjmp_receiver (lab1));
444 #ifdef HAVE_nonlocal_goto_receiver
445 if (HAVE_nonlocal_goto_receiver)
446 emit_insn (gen_nonlocal_goto_receiver ());
453 /* Set TARGET, and branch to the next-time-through label. */
454 emit_move_insn (target, const1_rtx);
455 emit_jump_insn (gen_jump (next_label));
461 /* __builtin_longjmp is passed a pointer to an array of five words (not
462 all will be used on all machines). It operates similarly to the C
463 library function of the same name, but is more efficient. Much of
464 the code below is copied from the handling of non-local gotos.
466 NOTE: This is intended for use by GNAT and the exception handling
467 scheme in the compiler and will only work in the method used by
471 expand_builtin_longjmp (buf_addr, value)
475 enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
477 #ifdef POINTERS_EXTEND_UNSIGNED
478 buf_addr = convert_memory_address (Pmode, buf_addr);
480 buf_addr = force_reg (Pmode, buf_addr);
482 /* We used to store value in static_chain_rtx, but that fails if pointers
483 are smaller than integers. We instead require that the user must pass
484 a second argument of 1, because that is what builtin_setjmp will
485 return. This also makes EH slightly more efficient, since we are no
486 longer copying around a value that we don't care about. */
487 if (value != const1_rtx)
490 #ifdef HAVE_builtin_longjmp
491 if (HAVE_builtin_longjmp)
492 emit_insn (gen_builtin_longjmp (buf_addr));
496 fp = gen_rtx_MEM (Pmode, buf_addr);
497 lab = gen_rtx_MEM (Pmode, plus_constant (buf_addr,
498 GET_MODE_SIZE (Pmode)));
500 stack = gen_rtx_MEM (sa_mode, plus_constant (buf_addr,
501 2 * GET_MODE_SIZE (Pmode)));
503 /* Pick up FP, label, and SP from the block and jump. This code is
504 from expand_goto in stmt.c; see there for detailed comments. */
505 #if HAVE_nonlocal_goto
506 if (HAVE_nonlocal_goto)
507 /* We have to pass a value to the nonlocal_goto pattern that will
508 get copied into the static_chain pointer, but it does not matter
509 what that value is, because builtin_setjmp does not use it. */
510 emit_insn (gen_nonlocal_goto (value, fp, stack, lab));
514 lab = copy_to_reg (lab);
516 emit_move_insn (hard_frame_pointer_rtx, fp);
517 emit_stack_restore (SAVE_NONLOCAL, stack, NULL_RTX);
519 emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
520 emit_insn (gen_rtx_USE (VOIDmode, stack_pointer_rtx));
521 emit_indirect_jump (lab);
526 /* Get a MEM rtx for expression EXP which can be used in a string instruction
527 (cmpstrsi, movstrsi, ..). */
535 mem = gen_rtx_MEM (BLKmode,
536 memory_address (BLKmode,
537 expand_expr (exp, NULL_RTX,
538 ptr_mode, EXPAND_SUM)));
540 RTX_UNCHANGING_P (mem) = TREE_READONLY (exp);
542 /* Figure out the type of the object pointed to. Set MEM_IN_STRUCT_P
543 if the value is the address of a structure or if the expression is
544 cast to a pointer to structure type. */
547 while (TREE_CODE (exp) == NOP_EXPR)
549 tree cast_type = TREE_TYPE (exp);
550 if (TREE_CODE (cast_type) == POINTER_TYPE
551 && AGGREGATE_TYPE_P (TREE_TYPE (cast_type)))
556 exp = TREE_OPERAND (exp, 0);
559 if (is_aggregate == 0)
563 if (TREE_CODE (exp) == ADDR_EXPR)
564 /* If this is the address of an object, check whether the
565 object is an array. */
566 type = TREE_TYPE (TREE_OPERAND (exp, 0));
568 type = TREE_TYPE (TREE_TYPE (exp));
569 is_aggregate = AGGREGATE_TYPE_P (type);
572 MEM_SET_IN_STRUCT_P (mem, is_aggregate);
576 /* Built-in functions to perform an untyped call and return. */
578 /* For each register that may be used for calling a function, this
579 gives a mode used to copy the register's value. VOIDmode indicates
580 the register is not used for calling a function. If the machine
581 has register windows, this gives only the outbound registers.
582 INCOMING_REGNO gives the corresponding inbound register. */
583 static enum machine_mode apply_args_mode[FIRST_PSEUDO_REGISTER];
585 /* For each register that may be used for returning values, this gives
586 a mode used to copy the register's value. VOIDmode indicates the
587 register is not used for returning values. If the machine has
588 register windows, this gives only the outbound registers.
589 INCOMING_REGNO gives the corresponding inbound register. */
590 static enum machine_mode apply_result_mode[FIRST_PSEUDO_REGISTER];
592 /* For each register that may be used for calling a function, this
593 gives the offset of that register into the block returned by
594 __builtin_apply_args. 0 indicates that the register is not
595 used for calling a function. */
596 static int apply_args_reg_offset[FIRST_PSEUDO_REGISTER];
598 /* Return the offset of register REGNO into the block returned by
599 __builtin_apply_args. This is not declared static, since it is
600 needed in objc-act.c. */
603 apply_args_register_offset (regno)
608 /* Arguments are always put in outgoing registers (in the argument
609 block) if such make sense. */
610 #ifdef OUTGOING_REGNO
611 regno = OUTGOING_REGNO(regno);
613 return apply_args_reg_offset[regno];
616 /* Return the size required for the block returned by __builtin_apply_args,
617 and initialize apply_args_mode. */
622 static int size = -1;
624 enum machine_mode mode;
626 /* The values computed by this function never change. */
629 /* The first value is the incoming arg-pointer. */
630 size = GET_MODE_SIZE (Pmode);
632 /* The second value is the structure value address unless this is
633 passed as an "invisible" first argument. */
634 if (struct_value_rtx)
635 size += GET_MODE_SIZE (Pmode);
637 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
638 if (FUNCTION_ARG_REGNO_P (regno))
640 /* Search for the proper mode for copying this register's
641 value. I'm not sure this is right, but it works so far. */
642 enum machine_mode best_mode = VOIDmode;
644 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
646 mode = GET_MODE_WIDER_MODE (mode))
647 if (HARD_REGNO_MODE_OK (regno, mode)
648 && HARD_REGNO_NREGS (regno, mode) == 1)
651 if (best_mode == VOIDmode)
652 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
654 mode = GET_MODE_WIDER_MODE (mode))
655 if (HARD_REGNO_MODE_OK (regno, mode)
656 && (mov_optab->handlers[(int) mode].insn_code
657 != CODE_FOR_nothing))
661 if (mode == VOIDmode)
664 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
665 if (size % align != 0)
666 size = CEIL (size, align) * align;
667 apply_args_reg_offset[regno] = size;
668 size += GET_MODE_SIZE (mode);
669 apply_args_mode[regno] = mode;
673 apply_args_mode[regno] = VOIDmode;
674 apply_args_reg_offset[regno] = 0;
680 /* Return the size required for the block returned by __builtin_apply,
681 and initialize apply_result_mode. */
686 static int size = -1;
688 enum machine_mode mode;
690 /* The values computed by this function never change. */
695 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
696 if (FUNCTION_VALUE_REGNO_P (regno))
698 /* Search for the proper mode for copying this register's
699 value. I'm not sure this is right, but it works so far. */
700 enum machine_mode best_mode = VOIDmode;
702 for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
704 mode = GET_MODE_WIDER_MODE (mode))
705 if (HARD_REGNO_MODE_OK (regno, mode))
708 if (best_mode == VOIDmode)
709 for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
711 mode = GET_MODE_WIDER_MODE (mode))
712 if (HARD_REGNO_MODE_OK (regno, mode)
713 && (mov_optab->handlers[(int) mode].insn_code
714 != CODE_FOR_nothing))
718 if (mode == VOIDmode)
721 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
722 if (size % align != 0)
723 size = CEIL (size, align) * align;
724 size += GET_MODE_SIZE (mode);
725 apply_result_mode[regno] = mode;
728 apply_result_mode[regno] = VOIDmode;
730 /* Allow targets that use untyped_call and untyped_return to override
731 the size so that machine-specific information can be stored here. */
732 #ifdef APPLY_RESULT_SIZE
733 size = APPLY_RESULT_SIZE;
739 #if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
740 /* Create a vector describing the result block RESULT. If SAVEP is true,
741 the result block is used to save the values; otherwise it is used to
742 restore the values. */
745 result_vector (savep, result)
749 int regno, size, align, nelts;
750 enum machine_mode mode;
752 rtx *savevec = (rtx *) alloca (FIRST_PSEUDO_REGISTER * sizeof (rtx));
755 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
756 if ((mode = apply_result_mode[regno]) != VOIDmode)
758 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
759 if (size % align != 0)
760 size = CEIL (size, align) * align;
761 reg = gen_rtx_REG (mode, savep ? regno : INCOMING_REGNO (regno));
762 mem = change_address (result, mode,
763 plus_constant (XEXP (result, 0), size));
764 savevec[nelts++] = (savep
765 ? gen_rtx_SET (VOIDmode, mem, reg)
766 : gen_rtx_SET (VOIDmode, reg, mem));
767 size += GET_MODE_SIZE (mode);
769 return gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (nelts, savevec));
771 #endif /* HAVE_untyped_call or HAVE_untyped_return */
773 /* Save the state required to perform an untyped call with the same
774 arguments as were passed to the current function. */
777 expand_builtin_apply_args_1 ()
780 int size, align, regno;
781 enum machine_mode mode;
783 /* Create a block where the arg-pointer, structure value address,
784 and argument registers can be saved. */
785 registers = assign_stack_local (BLKmode, apply_args_size (), -1);
787 /* Walk past the arg-pointer and structure value address. */
788 size = GET_MODE_SIZE (Pmode);
789 if (struct_value_rtx)
790 size += GET_MODE_SIZE (Pmode);
792 /* Save each register used in calling a function to the block. */
793 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
794 if ((mode = apply_args_mode[regno]) != VOIDmode)
798 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
799 if (size % align != 0)
800 size = CEIL (size, align) * align;
802 tem = gen_rtx_REG (mode, INCOMING_REGNO (regno));
804 emit_move_insn (change_address (registers, mode,
805 plus_constant (XEXP (registers, 0),
808 size += GET_MODE_SIZE (mode);
811 /* Save the arg pointer to the block. */
812 emit_move_insn (change_address (registers, Pmode, XEXP (registers, 0)),
813 copy_to_reg (virtual_incoming_args_rtx));
814 size = GET_MODE_SIZE (Pmode);
816 /* Save the structure value address unless this is passed as an
817 "invisible" first argument. */
818 if (struct_value_incoming_rtx)
820 emit_move_insn (change_address (registers, Pmode,
821 plus_constant (XEXP (registers, 0),
823 copy_to_reg (struct_value_incoming_rtx));
824 size += GET_MODE_SIZE (Pmode);
827 /* Return the address of the block. */
828 return copy_addr_to_reg (XEXP (registers, 0));
831 /* __builtin_apply_args returns block of memory allocated on
832 the stack into which is stored the arg pointer, structure
833 value address, static chain, and all the registers that might
834 possibly be used in performing a function call. The code is
835 moved to the start of the function so the incoming values are
838 expand_builtin_apply_args ()
840 /* Don't do __builtin_apply_args more than once in a function.
841 Save the result of the first call and reuse it. */
842 if (apply_args_value != 0)
843 return apply_args_value;
845 /* When this function is called, it means that registers must be
846 saved on entry to this function. So we migrate the
847 call to the first insn of this function. */
852 temp = expand_builtin_apply_args_1 ();
856 apply_args_value = temp;
858 /* Put the sequence after the NOTE that starts the function.
859 If this is inside a SEQUENCE, make the outer-level insn
860 chain current, so the code is placed at the start of the
862 push_topmost_sequence ();
863 emit_insns_before (seq, NEXT_INSN (get_insns ()));
864 pop_topmost_sequence ();
869 /* Perform an untyped call and save the state required to perform an
870 untyped return of whatever value was returned by the given function. */
873 expand_builtin_apply (function, arguments, argsize)
874 rtx function, arguments, argsize;
876 int size, align, regno;
877 enum machine_mode mode;
878 rtx incoming_args, result, reg, dest, call_insn;
879 rtx old_stack_level = 0;
882 /* Create a block where the return registers can be saved. */
883 result = assign_stack_local (BLKmode, apply_result_size (), -1);
885 /* ??? The argsize value should be adjusted here. */
887 /* Fetch the arg pointer from the ARGUMENTS block. */
888 incoming_args = gen_reg_rtx (Pmode);
889 emit_move_insn (incoming_args,
890 gen_rtx_MEM (Pmode, arguments));
891 #ifndef STACK_GROWS_DOWNWARD
892 incoming_args = expand_binop (Pmode, sub_optab, incoming_args, argsize,
893 incoming_args, 0, OPTAB_LIB_WIDEN);
896 /* Perform postincrements before actually calling the function. */
899 /* Push a new argument block and copy the arguments. */
900 do_pending_stack_adjust ();
902 /* Save the stack with nonlocal if available */
903 #ifdef HAVE_save_stack_nonlocal
904 if (HAVE_save_stack_nonlocal)
905 emit_stack_save (SAVE_NONLOCAL, &old_stack_level, NULL_RTX);
908 emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
910 /* Push a block of memory onto the stack to store the memory arguments.
911 Save the address in a register, and copy the memory arguments. ??? I
912 haven't figured out how the calling convention macros effect this,
913 but it's likely that the source and/or destination addresses in
914 the block copy will need updating in machine specific ways. */
915 dest = allocate_dynamic_stack_space (argsize, 0, 0);
916 emit_block_move (gen_rtx_MEM (BLKmode, dest),
917 gen_rtx_MEM (BLKmode, incoming_args),
919 PARM_BOUNDARY / BITS_PER_UNIT);
921 /* Refer to the argument block. */
923 arguments = gen_rtx_MEM (BLKmode, arguments);
925 /* Walk past the arg-pointer and structure value address. */
926 size = GET_MODE_SIZE (Pmode);
927 if (struct_value_rtx)
928 size += GET_MODE_SIZE (Pmode);
930 /* Restore each of the registers previously saved. Make USE insns
931 for each of these registers for use in making the call. */
932 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
933 if ((mode = apply_args_mode[regno]) != VOIDmode)
935 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
936 if (size % align != 0)
937 size = CEIL (size, align) * align;
938 reg = gen_rtx_REG (mode, regno);
940 change_address (arguments, mode,
941 plus_constant (XEXP (arguments, 0),
944 use_reg (&call_fusage, reg);
945 size += GET_MODE_SIZE (mode);
948 /* Restore the structure value address unless this is passed as an
949 "invisible" first argument. */
950 size = GET_MODE_SIZE (Pmode);
951 if (struct_value_rtx)
953 rtx value = gen_reg_rtx (Pmode);
954 emit_move_insn (value,
955 change_address (arguments, Pmode,
956 plus_constant (XEXP (arguments, 0),
958 emit_move_insn (struct_value_rtx, value);
959 if (GET_CODE (struct_value_rtx) == REG)
960 use_reg (&call_fusage, struct_value_rtx);
961 size += GET_MODE_SIZE (Pmode);
964 /* All arguments and registers used for the call are set up by now! */
965 function = prepare_call_address (function, NULL_TREE, &call_fusage, 0);
967 /* Ensure address is valid. SYMBOL_REF is already valid, so no need,
968 and we don't want to load it into a register as an optimization,
969 because prepare_call_address already did it if it should be done. */
970 if (GET_CODE (function) != SYMBOL_REF)
971 function = memory_address (FUNCTION_MODE, function);
973 /* Generate the actual call instruction and save the return value. */
974 #ifdef HAVE_untyped_call
975 if (HAVE_untyped_call)
976 emit_call_insn (gen_untyped_call (gen_rtx_MEM (FUNCTION_MODE, function),
977 result, result_vector (1, result)));
980 #ifdef HAVE_call_value
985 /* Locate the unique return register. It is not possible to
986 express a call that sets more than one return register using
987 call_value; use untyped_call for that. In fact, untyped_call
988 only needs to save the return registers in the given block. */
989 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
990 if ((mode = apply_result_mode[regno]) != VOIDmode)
993 abort (); /* HAVE_untyped_call required. */
994 valreg = gen_rtx_REG (mode, regno);
997 emit_call_insn (gen_call_value (valreg,
998 gen_rtx_MEM (FUNCTION_MODE, function),
999 const0_rtx, NULL_RTX, const0_rtx));
1001 emit_move_insn (change_address (result, GET_MODE (valreg),
1009 /* Find the CALL insn we just emitted. */
1010 for (call_insn = get_last_insn ();
1011 call_insn && GET_CODE (call_insn) != CALL_INSN;
1012 call_insn = PREV_INSN (call_insn))
1018 /* Put the register usage information on the CALL. If there is already
1019 some usage information, put ours at the end. */
1020 if (CALL_INSN_FUNCTION_USAGE (call_insn))
1024 for (link = CALL_INSN_FUNCTION_USAGE (call_insn); XEXP (link, 1) != 0;
1025 link = XEXP (link, 1))
1028 XEXP (link, 1) = call_fusage;
1031 CALL_INSN_FUNCTION_USAGE (call_insn) = call_fusage;
1033 /* Restore the stack. */
1034 #ifdef HAVE_save_stack_nonlocal
1035 if (HAVE_save_stack_nonlocal)
1036 emit_stack_restore (SAVE_NONLOCAL, old_stack_level, NULL_RTX);
1039 emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX);
1041 /* Return the address of the result block. */
1042 return copy_addr_to_reg (XEXP (result, 0));
1045 /* Perform an untyped return. */
1048 expand_builtin_return (result)
1051 int size, align, regno;
1052 enum machine_mode mode;
1054 rtx call_fusage = 0;
1056 apply_result_size ();
1057 result = gen_rtx_MEM (BLKmode, result);
1059 #ifdef HAVE_untyped_return
1060 if (HAVE_untyped_return)
1062 emit_jump_insn (gen_untyped_return (result, result_vector (0, result)));
1068 /* Restore the return value and note that each value is used. */
1070 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
1071 if ((mode = apply_result_mode[regno]) != VOIDmode)
1073 align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
1074 if (size % align != 0)
1075 size = CEIL (size, align) * align;
1076 reg = gen_rtx_REG (mode, INCOMING_REGNO (regno));
1077 emit_move_insn (reg,
1078 change_address (result, mode,
1079 plus_constant (XEXP (result, 0),
1082 push_to_sequence (call_fusage);
1083 emit_insn (gen_rtx_USE (VOIDmode, reg));
1084 call_fusage = get_insns ();
1086 size += GET_MODE_SIZE (mode);
1089 /* Put the USE insns before the return. */
1090 emit_insns (call_fusage);
1092 /* Return whatever values was restored by jumping directly to the end
1094 expand_null_return ();
1097 /* Expand a call to __builtin_classify_type with arguments found in
1100 expand_builtin_classify_type (arglist)
1105 tree type = TREE_TYPE (TREE_VALUE (arglist));
1106 enum tree_code code = TREE_CODE (type);
1107 if (code == VOID_TYPE)
1108 return GEN_INT (void_type_class);
1109 if (code == INTEGER_TYPE)
1110 return GEN_INT (integer_type_class);
1111 if (code == CHAR_TYPE)
1112 return GEN_INT (char_type_class);
1113 if (code == ENUMERAL_TYPE)
1114 return GEN_INT (enumeral_type_class);
1115 if (code == BOOLEAN_TYPE)
1116 return GEN_INT (boolean_type_class);
1117 if (code == POINTER_TYPE)
1118 return GEN_INT (pointer_type_class);
1119 if (code == REFERENCE_TYPE)
1120 return GEN_INT (reference_type_class);
1121 if (code == OFFSET_TYPE)
1122 return GEN_INT (offset_type_class);
1123 if (code == REAL_TYPE)
1124 return GEN_INT (real_type_class);
1125 if (code == COMPLEX_TYPE)
1126 return GEN_INT (complex_type_class);
1127 if (code == FUNCTION_TYPE)
1128 return GEN_INT (function_type_class);
1129 if (code == METHOD_TYPE)
1130 return GEN_INT (method_type_class);
1131 if (code == RECORD_TYPE)
1132 return GEN_INT (record_type_class);
1133 if (code == UNION_TYPE || code == QUAL_UNION_TYPE)
1134 return GEN_INT (union_type_class);
1135 if (code == ARRAY_TYPE)
1137 if (TYPE_STRING_FLAG (type))
1138 return GEN_INT (string_type_class);
1140 return GEN_INT (array_type_class);
1142 if (code == SET_TYPE)
1143 return GEN_INT (set_type_class);
1144 if (code == FILE_TYPE)
1145 return GEN_INT (file_type_class);
1146 if (code == LANG_TYPE)
1147 return GEN_INT (lang_type_class);
1149 return GEN_INT (no_type_class);
1152 /* Expand expression EXP, which is a call to __builtin_constant_p. */
1154 expand_builtin_constant_p (exp)
1157 tree arglist = TREE_OPERAND (exp, 1);
1158 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1164 tree arg = TREE_VALUE (arglist);
1167 /* We return 1 for a numeric type that's known to be a constant
1168 value at compile-time or for an aggregate type that's a
1169 literal constant. */
1172 /* If we know this is a constant, emit the constant of one. */
1173 if (TREE_CODE_CLASS (TREE_CODE (arg)) == 'c'
1174 || (TREE_CODE (arg) == CONSTRUCTOR
1175 && TREE_CONSTANT (arg))
1176 || (TREE_CODE (arg) == ADDR_EXPR
1177 && TREE_CODE (TREE_OPERAND (arg, 0)) == STRING_CST))
1180 /* If we aren't going to be running CSE or this expression
1181 has side effects, show we don't know it to be a constant.
1182 Likewise if it's a pointer or aggregate type since in those
1183 case we only want literals, since those are only optimized
1184 when generating RTL, not later. */
1185 if (TREE_SIDE_EFFECTS (arg) || cse_not_expected
1186 || AGGREGATE_TYPE_P (TREE_TYPE (arg))
1187 || POINTER_TYPE_P (TREE_TYPE (arg)))
1190 /* Otherwise, emit (constant_p_rtx (ARG)) and let CSE get a
1191 chance to see if it can deduce whether ARG is constant. */
1193 tmp = expand_expr (arg, NULL_RTX, VOIDmode, 0);
1194 tmp = gen_rtx_CONSTANT_P_RTX (value_mode, tmp);
1199 /* Expand a call to one of the builtin math functions (sin, cos, or sqrt).
1200 Return 0 if a normal call should be emitted rather than expanding the
1201 function in-line. EXP is the expression that is a call to the builtin
1202 function; if convenient, the result should be placed in TARGET.
1203 SUBTARGET may be used as the target for computing one of EXP's operands. */
1205 expand_builtin_mathfn (exp, target, subtarget)
1207 rtx target, subtarget;
1209 optab builtin_optab;
1211 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
1212 tree arglist = TREE_OPERAND (exp, 1);
1215 /* Arg could be wrong type if user redeclared this fcn wrong. */
1216 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != REAL_TYPE)
1219 /* Stabilize and compute the argument. */
1220 if (TREE_CODE (TREE_VALUE (arglist)) != VAR_DECL
1221 && TREE_CODE (TREE_VALUE (arglist)) != PARM_DECL)
1223 exp = copy_node (exp);
1224 TREE_OPERAND (exp, 1) = arglist;
1225 /* Wrap the computation of the argument in a SAVE_EXPR. That
1226 way, if we need to expand the argument again (as in the
1227 flag_errno_math case below where we cannot directly set
1228 errno), we will not perform side-effects more than once.
1229 Note that here we're mutating the original EXP as well as the
1230 copy; that's the right thing to do in case the original EXP
1231 is expanded later. */
1232 TREE_VALUE (arglist) = save_expr (TREE_VALUE (arglist));
1233 arglist = copy_node (arglist);
1235 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
1237 /* Make a suitable register to place result in. */
1238 target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));
1243 switch (DECL_FUNCTION_CODE (fndecl))
1246 builtin_optab = sin_optab; break;
1248 builtin_optab = cos_optab; break;
1249 case BUILT_IN_FSQRT:
1250 builtin_optab = sqrt_optab; break;
1255 /* Compute into TARGET.
1256 Set TARGET to wherever the result comes back. */
1257 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
1258 builtin_optab, op0, target, 0);
1260 /* If we were unable to expand via the builtin, stop the
1261 sequence (without outputting the insns) and return 0, causing
1262 a call to the library function. */
1269 /* Check the results by default. But if flag_fast_math is turned on,
1270 then assume sqrt will always be called with valid arguments. */
1272 if (flag_errno_math && ! flag_fast_math)
1276 /* Don't define the builtin FP instructions
1277 if your machine is not IEEE. */
1278 if (TARGET_FLOAT_FORMAT != IEEE_FLOAT_FORMAT)
1281 lab1 = gen_label_rtx ();
1283 /* Test the result; if it is NaN, set errno=EDOM because
1284 the argument was not in the domain. */
1285 emit_cmp_and_jump_insns (target, target, EQ, 0, GET_MODE (target),
1290 #ifdef GEN_ERRNO_RTX
1291 rtx errno_rtx = GEN_ERRNO_RTX;
1294 = gen_rtx_MEM (word_mode, gen_rtx_SYMBOL_REF (Pmode, "errno"));
1297 emit_move_insn (errno_rtx, GEN_INT (TARGET_EDOM));
1300 /* We can't set errno=EDOM directly; let the library call do it.
1301 Pop the arguments right away in case the call gets deleted. */
1303 expand_call (exp, target, 0);
1310 /* Output the entire sequence. */
1311 insns = get_insns ();
1318 /* Expand expression EXP which is a call to the strlen builtin. Return 0
1319 if we failed the caller should emit a normal call, otherwise
1320 try to get the result in TARGET, if convenient (and in mode MODE if that's
1323 expand_builtin_strlen (exp, target, mode)
1326 enum machine_mode mode;
1328 tree arglist = TREE_OPERAND (exp, 1);
1329 enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
1332 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1333 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE)
1338 tree src = TREE_VALUE (arglist);
1339 tree len = c_strlen (src);
1342 = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1344 rtx result, src_reg, char_rtx, before_strlen;
1345 enum machine_mode insn_mode = value_mode, char_mode;
1346 enum insn_code icode = CODE_FOR_nothing;
1348 /* If the length is known, just return it. */
1350 return expand_expr (len, target, mode, EXPAND_MEMORY_USE_BAD);
1352 /* If SRC is not a pointer type, don't do this operation inline. */
1356 /* Bail out if we can't compute strlen in the right mode. */
1357 while (insn_mode != VOIDmode)
1359 icode = strlen_optab->handlers[(int) insn_mode].insn_code;
1360 if (icode != CODE_FOR_nothing)
1363 insn_mode = GET_MODE_WIDER_MODE (insn_mode);
1365 if (insn_mode == VOIDmode)
1368 /* Make a place to write the result of the instruction. */
1371 && GET_CODE (result) == REG
1372 && GET_MODE (result) == insn_mode
1373 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
1374 result = gen_reg_rtx (insn_mode);
1376 /* Make a place to hold the source address. We will not expand
1377 the actual source until we are sure that the expansion will
1378 not fail -- there are trees that cannot be expanded twice. */
1379 src_reg = gen_reg_rtx (Pmode);
1381 /* Mark the beginning of the strlen sequence so we can emit the
1382 source operand later. */
1383 before_strlen = get_last_insn();
1384 if (before_strlen == NULL_RTX)
1385 before_strlen = emit_note (0, NOTE_INSN_DELETED);
1387 /* Check the string is readable and has an end. */
1388 if (current_function_check_memory_usage)
1389 emit_library_call (chkr_check_str_libfunc, 1, VOIDmode, 2,
1391 GEN_INT (MEMORY_USE_RO),
1392 TYPE_MODE (integer_type_node));
1394 char_rtx = const0_rtx;
1395 char_mode = insn_data[(int)icode].operand[2].mode;
1396 if (! (*insn_data[(int)icode].operand[2].predicate) (char_rtx, char_mode))
1397 char_rtx = copy_to_mode_reg (char_mode, char_rtx);
1399 pat = GEN_FCN (icode) (result, gen_rtx_MEM (BLKmode, src_reg),
1400 char_rtx, GEN_INT (align));
1405 /* Now that we are assured of success, expand the source. */
1407 pat = expand_expr (src, src_reg, ptr_mode, EXPAND_SUM);
1409 emit_move_insn (src_reg, pat);
1410 pat = gen_sequence ();
1412 emit_insn_after (pat, before_strlen);
1414 /* Return the value in the proper mode for this function. */
1415 if (GET_MODE (result) == value_mode)
1417 else if (target != 0)
1418 convert_move (target, result, 0);
1420 target = convert_to_mode (value_mode, result, 0);
1426 /* Expand a call to the memcpy builtin, with arguments in ARGLIST. */
1428 expand_builtin_memcpy (arglist)
1432 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1433 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
1434 || TREE_CHAIN (arglist) == 0
1435 || (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist))))
1437 || TREE_CHAIN (TREE_CHAIN (arglist)) == 0
1438 || (TREE_CODE (TREE_TYPE (TREE_VALUE
1439 (TREE_CHAIN (TREE_CHAIN (arglist)))))
1444 tree dest = TREE_VALUE (arglist);
1445 tree src = TREE_VALUE (TREE_CHAIN (arglist));
1446 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1449 = get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1451 = get_pointer_alignment (dest, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1452 rtx dest_mem, src_mem, dest_addr, len_rtx;
1454 /* If either SRC or DEST is not a pointer type, don't do
1455 this operation in-line. */
1456 if (src_align == 0 || dest_align == 0)
1459 dest_mem = get_memory_rtx (dest);
1460 src_mem = get_memory_rtx (src);
1461 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
1463 /* Just copy the rights of SRC to the rights of DEST. */
1464 if (current_function_check_memory_usage)
1465 emit_library_call (chkr_copy_bitmap_libfunc, 1, VOIDmode, 3,
1466 XEXP (dest_mem, 0), Pmode,
1467 XEXP (src_mem, 0), Pmode,
1468 len_rtx, TYPE_MODE (sizetype));
1470 /* Copy word part most expediently. */
1472 = emit_block_move (dest_mem, src_mem, len_rtx,
1473 MIN (src_align, dest_align));
1476 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
1482 /* Expand expression EXP, which is a call to the strcpy builtin. Return 0
1483 if we failed the caller should emit a normal call. */
1486 expand_builtin_strcpy (exp)
1489 tree arglist = TREE_OPERAND (exp, 1);
1493 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1494 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
1495 || TREE_CHAIN (arglist) == 0
1496 || (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist))))
1501 tree len = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
1506 len = size_binop (PLUS_EXPR, len, ssize_int (1));
1507 chainon (arglist, build_tree_list (NULL_TREE, len));
1510 result = expand_builtin_memcpy (arglist);
1513 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
1517 /* Expand expression EXP, which is a call to the memset builtin. Return 0
1518 if we failed the caller should emit a normal call. */
1521 expand_builtin_memset (exp)
1524 tree arglist = TREE_OPERAND (exp, 1);
1527 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1528 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
1529 || TREE_CHAIN (arglist) == 0
1530 || (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist))))
1532 || TREE_CHAIN (TREE_CHAIN (arglist)) == 0
1534 != (TREE_CODE (TREE_TYPE
1536 (TREE_CHAIN (TREE_CHAIN (arglist))))))))
1540 tree dest = TREE_VALUE (arglist);
1541 tree val = TREE_VALUE (TREE_CHAIN (arglist));
1542 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1545 = get_pointer_alignment (dest, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1546 rtx dest_mem, dest_addr, len_rtx;
1548 /* If DEST is not a pointer type, don't do this
1549 operation in-line. */
1550 if (dest_align == 0)
1553 /* If the arguments have side-effects, then we can only evaluate
1554 them at most once. The following code evaluates them twice if
1555 they are not constants because we break out to expand_call
1556 in that case. They can't be constants if they have side-effects
1557 so we can check for that first. Alternatively, we could call
1558 save_expr to make multiple evaluation safe. */
1559 if (TREE_SIDE_EFFECTS (val) || TREE_SIDE_EFFECTS (len))
1562 /* If VAL is not 0, don't do this operation in-line. */
1563 if (expand_expr (val, NULL_RTX, VOIDmode, 0) != const0_rtx)
1566 len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
1568 dest_mem = get_memory_rtx (dest);
1570 /* Just check DST is writable and mark it as readable. */
1571 if (current_function_check_memory_usage)
1572 emit_library_call (chkr_check_addr_libfunc, 1, VOIDmode, 3,
1573 XEXP (dest_mem, 0), Pmode,
1574 len_rtx, TYPE_MODE (sizetype),
1575 GEN_INT (MEMORY_USE_WO),
1576 TYPE_MODE (integer_type_node));
1579 dest_addr = clear_storage (dest_mem, len_rtx, dest_align);
1582 dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
1588 #ifdef HAVE_cmpstrsi
1589 /* Expand expression EXP, which is a call to the memcmp or the strcmp builtin.
1590 ARGLIST is the argument list for this call. Return 0 if we failed and the
1591 caller should emit a normal call, otherwise try to get the result in
1592 TARGET, if convenient. */
1594 expand_builtin_memcmp (exp, arglist, target)
1599 /* If we need to check memory accesses, call the library function. */
1600 if (current_function_check_memory_usage)
1604 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1605 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
1606 || TREE_CHAIN (arglist) == 0
1607 || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) != POINTER_TYPE
1608 || TREE_CHAIN (TREE_CHAIN (arglist)) == 0
1609 || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))))) != INTEGER_TYPE)
1611 else if (!HAVE_cmpstrsi)
1615 enum machine_mode mode;
1616 tree arg1 = TREE_VALUE (arglist);
1617 tree arg2 = TREE_VALUE (TREE_CHAIN (arglist));
1618 tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
1622 = get_pointer_alignment (arg1, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1624 = get_pointer_alignment (arg2, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
1625 enum machine_mode insn_mode
1626 = insn_data[(int) CODE_FOR_cmpstrsi].operand[0].mode;
1628 /* If we don't have POINTER_TYPE, call the function. */
1629 if (arg1_align == 0 || arg2_align == 0)
1632 /* Make a place to write the result of the instruction. */
1635 && GET_CODE (result) == REG && GET_MODE (result) == insn_mode
1636 && REGNO (result) >= FIRST_PSEUDO_REGISTER))
1637 result = gen_reg_rtx (insn_mode);
1639 emit_insn (gen_cmpstrsi (result, get_memory_rtx (arg1),
1640 get_memory_rtx (arg2),
1641 expand_expr (len, NULL_RTX, VOIDmode, 0),
1642 GEN_INT (MIN (arg1_align, arg2_align))));
1644 /* Return the value in the proper mode for this function. */
1645 mode = TYPE_MODE (TREE_TYPE (exp));
1646 if (GET_MODE (result) == mode)
1648 else if (target != 0)
1650 convert_move (target, result, 0);
1654 return convert_to_mode (mode, result, 0);
1658 /* Expand expression EXP, which is a call to the strcmp builtin. Return 0
1659 if we failed the caller should emit a normal call, otherwise try to get
1660 the result in TARGET, if convenient. */
1663 expand_builtin_strcmp (exp, target)
1667 tree arglist = TREE_OPERAND (exp, 1);
1669 /* If we need to check memory accesses, call the library function. */
1670 if (current_function_check_memory_usage)
1674 /* Arg could be non-pointer if user redeclared this fcn wrong. */
1675 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE
1676 || TREE_CHAIN (arglist) == 0
1677 || (TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist))))
1681 else if (! HAVE_cmpstrsi)
1684 tree arg1 = TREE_VALUE (arglist);
1685 tree arg2 = TREE_VALUE (TREE_CHAIN (arglist));
1686 tree len = c_strlen (arg1);
1687 tree len2 = c_strlen (arg2);
1691 len = size_binop (PLUS_EXPR, ssize_int (1), len);
1694 len2 = size_binop (PLUS_EXPR, ssize_int (1), len2);
1696 /* If we don't have a constant length for the first, use the length
1697 of the second, if we know it. We don't require a constant for
1698 this case; some cost analysis could be done if both are available
1699 but neither is constant. For now, assume they're equally cheap.
1701 If both strings have constant lengths, use the smaller. This
1702 could arise if optimization results in strcpy being called with
1703 two fixed strings, or if the code was machine-generated. We should
1704 add some code to the `memcmp' handler below to deal with such
1705 situations, someday. */
1707 if (!len || TREE_CODE (len) != INTEGER_CST)
1714 else if (len2 && TREE_CODE (len2) == INTEGER_CST
1715 && tree_int_cst_lt (len2, len))
1718 chainon (arglist, build_tree_list (NULL_TREE, len));
1719 result = expand_builtin_memcmp (exp, arglist, target);
1721 TREE_CHAIN (TREE_CHAIN (arglist)) = 0;
1728 /* Expand a call to __builtin_saveregs, generating the result in TARGET,
1729 if that's convenient. */
1732 expand_builtin_saveregs ()
1736 /* Don't do __builtin_saveregs more than once in a function.
1737 Save the result of the first call and reuse it. */
1738 if (saveregs_value != 0)
1739 return saveregs_value;
1741 /* When this function is called, it means that registers must be
1742 saved on entry to this function. So we migrate the call to the
1743 first insn of this function. */
1747 #ifdef EXPAND_BUILTIN_SAVEREGS
1748 /* Do whatever the machine needs done in this case. */
1749 val = EXPAND_BUILTIN_SAVEREGS ();
1751 /* ??? We used to try and build up a call to the out of line function,
1752 guessing about what registers needed saving etc. This became much
1753 harder with __builtin_va_start, since we don't have a tree for a
1754 call to __builtin_saveregs to fall back on. There was exactly one
1755 port (i860) that used this code, and I'm unconvinced it could actually
1756 handle the general case. So we no longer try to handle anything
1757 weird and make the backend absorb the evil. */
1759 error ("__builtin_saveregs not supported by this target");
1766 saveregs_value = val;
1768 /* Put the sequence after the NOTE that starts the function. If this
1769 is inside a SEQUENCE, make the outer-level insn chain current, so
1770 the code is placed at the start of the function. */
1771 push_topmost_sequence ();
1772 emit_insns_after (seq, get_insns ());
1773 pop_topmost_sequence ();
1778 /* __builtin_args_info (N) returns word N of the arg space info
1779 for the current function. The number and meanings of words
1780 is controlled by the definition of CUMULATIVE_ARGS. */
1782 expand_builtin_args_info (exp)
1785 tree arglist = TREE_OPERAND (exp, 1);
1786 int nwords = sizeof (CUMULATIVE_ARGS) / sizeof (int);
1787 int *word_ptr = (int *) ¤t_function_args_info;
1789 /* These are used by the code below that is if 0'ed away */
1791 tree type, elts, result;
1794 if (sizeof (CUMULATIVE_ARGS) % sizeof (int) != 0)
1799 tree arg = TREE_VALUE (arglist);
1800 if (TREE_CODE (arg) != INTEGER_CST)
1801 error ("argument of `__builtin_args_info' must be constant");
1804 int wordnum = TREE_INT_CST_LOW (arg);
1806 if (wordnum < 0 || wordnum >= nwords || TREE_INT_CST_HIGH (arg))
1807 error ("argument of `__builtin_args_info' out of range");
1809 return GEN_INT (word_ptr[wordnum]);
1813 error ("missing argument in `__builtin_args_info'");
1818 for (i = 0; i < nwords; i++)
1819 elts = tree_cons (NULL_TREE, build_int_2 (word_ptr[i], 0));
1821 type = build_array_type (integer_type_node,
1822 build_index_type (build_int_2 (nwords, 0)));
1823 result = build (CONSTRUCTOR, type, NULL_TREE, nreverse (elts));
1824 TREE_CONSTANT (result) = 1;
1825 TREE_STATIC (result) = 1;
1826 result = build1 (INDIRECT_REF, build_pointer_type (type), result);
1827 TREE_CONSTANT (result) = 1;
1828 return expand_expr (result, NULL_RTX, VOIDmode, EXPAND_MEMORY_USE_BAD);
1832 /* Expand ARGLIST, from a call to __builtin_next_arg. */
1834 expand_builtin_next_arg (arglist)
1837 tree fntype = TREE_TYPE (current_function_decl);
1839 if ((TYPE_ARG_TYPES (fntype) == 0
1840 || (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype)))
1842 && ! current_function_varargs)
1844 error ("`va_start' used in function with fixed args");
1850 tree last_parm = tree_last (DECL_ARGUMENTS (current_function_decl));
1851 tree arg = TREE_VALUE (arglist);
1853 /* Strip off all nops for the sake of the comparison. This
1854 is not quite the same as STRIP_NOPS. It does more.
1855 We must also strip off INDIRECT_EXPR for C++ reference
1857 while (TREE_CODE (arg) == NOP_EXPR
1858 || TREE_CODE (arg) == CONVERT_EXPR
1859 || TREE_CODE (arg) == NON_LVALUE_EXPR
1860 || TREE_CODE (arg) == INDIRECT_REF)
1861 arg = TREE_OPERAND (arg, 0);
1862 if (arg != last_parm)
1863 warning ("second parameter of `va_start' not last named argument");
1865 else if (! current_function_varargs)
1866 /* Evidently an out of date version of <stdarg.h>; can't validate
1867 va_start's second argument, but can still work as intended. */
1868 warning ("`__builtin_next_arg' called without an argument");
1870 return expand_binop (Pmode, add_optab,
1871 current_function_internal_arg_pointer,
1872 current_function_arg_offset_rtx,
1873 NULL_RTX, 0, OPTAB_LIB_WIDEN);
1876 /* Make it easier for the backends by protecting the valist argument
1877 from multiple evaluations. */
1880 stabilize_va_list (valist, was_ptr)
1884 if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
1886 /* If stdarg.h took the address of an array-type valist that was passed
1887 as a parameter, we'll have taken the address of the parameter itself
1888 rather than the array as we'd intended. Undo this mistake. */
1892 STRIP_NOPS (valist);
1894 /* Two cases: either &array, which decomposed to
1895 <ptr <array <record> valist>>
1896 or &ptr, which turned into
1897 <ptr <ptr <record>>>
1898 In the first case we'll need to put the ADDR_EXPR back
1899 after frobbing the types as if &array[0]. */
1901 if (TREE_CODE (valist) != ADDR_EXPR)
1903 valist = TREE_OPERAND (valist, 0);
1906 if (TYPE_MAIN_VARIANT (TREE_TYPE (valist))
1907 == TYPE_MAIN_VARIANT (va_list_type_node))
1909 tree pt = build_pointer_type (TREE_TYPE (va_list_type_node));
1910 valist = build1 (ADDR_EXPR, pt, valist);
1911 TREE_SIDE_EFFECTS (valist)
1912 = TREE_SIDE_EFFECTS (TREE_OPERAND (valist, 0));
1916 if (! POINTER_TYPE_P (TREE_TYPE (valist))
1917 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (valist)))
1918 != TYPE_MAIN_VARIANT (TREE_TYPE (va_list_type_node))))
1922 if (TREE_SIDE_EFFECTS (valist))
1923 valist = save_expr (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;
1938 if (TREE_SIDE_EFFECTS (valist))
1939 valist = save_expr (valist);
1940 valist = fold (build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (valist)),
1947 /* The "standard" implementation of va_start: just assign `nextarg' to
1950 std_expand_builtin_va_start (stdarg_p, valist, nextarg)
1951 int stdarg_p ATTRIBUTE_UNUSED;
1958 nextarg = plus_constant (nextarg, -UNITS_PER_WORD);
1960 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
1961 make_tree (ptr_type_node, nextarg));
1962 TREE_SIDE_EFFECTS (t) = 1;
1964 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
1967 /* Expand ARGLIST, which from a call to __builtin_stdarg_va_start or
1968 __builtin_varargs_va_start, depending on STDARG_P. */
1970 expand_builtin_va_start (stdarg_p, arglist)
1975 tree chain = arglist, valist;
1978 nextarg = expand_builtin_next_arg (chain = TREE_CHAIN (arglist));
1980 nextarg = expand_builtin_next_arg (NULL_TREE);
1982 if (TREE_CHAIN (chain))
1983 error ("too many arguments to function `va_start'");
1985 valist = stabilize_va_list (TREE_VALUE (arglist), 1);
1987 #ifdef EXPAND_BUILTIN_VA_START
1988 EXPAND_BUILTIN_VA_START (stdarg_p, valist, nextarg);
1990 std_expand_builtin_va_start (stdarg_p, valist, nextarg);
1996 /* Allocate an alias set for use in storing and reading from the varargs
1999 get_varargs_alias_set ()
2001 static int set = -1;
2003 set = new_alias_set ();
2007 /* The "standard" implementation of va_arg: read the value from the
2008 current (padded) address and increment by the (padded) size. */
2010 std_expand_builtin_va_arg (valist, type)
2014 HOST_WIDE_INT align;
2015 HOST_WIDE_INT rounded_size;
2018 /* Compute the rounded size of the type. */
2019 align = PARM_BOUNDARY / BITS_PER_UNIT;
2020 rounded_size = (((int_size_in_bytes (type) + align - 1) / align) * align);
2024 if (PAD_VARARGS_DOWN)
2026 /* Small args are padded downward. */
2029 adj = TREE_INT_CST_LOW (TYPE_SIZE (type)) / BITS_PER_UNIT;
2030 if (rounded_size > align)
2033 addr_tree = build (PLUS_EXPR, TREE_TYPE (addr_tree), addr_tree,
2034 build_int_2 (rounded_size - adj, 0));
2037 addr = expand_expr (addr_tree, NULL_RTX, Pmode, EXPAND_NORMAL);
2038 addr = copy_to_reg (addr);
2040 /* Compute new value for AP. */
2041 t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
2042 build (PLUS_EXPR, TREE_TYPE (valist), valist,
2043 build_int_2 (rounded_size, 0)));
2044 TREE_SIDE_EFFECTS (t) = 1;
2045 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2050 /* Expand __builtin_va_arg, which is not really a builtin function, but
2051 a very special sort of operator. */
2053 expand_builtin_va_arg (valist, type)
2057 tree promoted_type, want_va_type, have_va_type;
2059 /* Verify that valist is of the proper type. */
2061 want_va_type = va_list_type_node;
2062 have_va_type = TREE_TYPE (valist);
2063 if (TREE_CODE (want_va_type) == ARRAY_TYPE)
2065 /* If va_list is an array type, the argument may have decayed
2066 to a pointer type, e.g. by being passed to another function.
2067 In that case, unwrap both types so that we can compare the
2068 underlying records. */
2069 if (TREE_CODE (have_va_type) == ARRAY_TYPE
2070 || TREE_CODE (have_va_type) == POINTER_TYPE)
2072 want_va_type = TREE_TYPE (want_va_type);
2073 have_va_type = TREE_TYPE (have_va_type);
2076 if (TYPE_MAIN_VARIANT (want_va_type) != TYPE_MAIN_VARIANT (have_va_type))
2078 error ("first argument to `va_arg' not of type `va_list'");
2082 /* Generate a diagnostic for requesting data of a type that cannot
2083 be passed through `...' due to type promotion at the call site. */
2084 else if ((promoted_type = (*lang_type_promotes_to) (type)) != NULL_TREE)
2086 const char *name = "<anonymous type>", *pname = 0;
2087 static int gave_help;
2089 if (TYPE_NAME (type))
2091 if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE)
2092 name = IDENTIFIER_POINTER (TYPE_NAME (type));
2093 else if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL
2094 && DECL_NAME (TYPE_NAME (type)))
2095 name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type)));
2097 if (TYPE_NAME (promoted_type))
2099 if (TREE_CODE (TYPE_NAME (promoted_type)) == IDENTIFIER_NODE)
2100 pname = IDENTIFIER_POINTER (TYPE_NAME (promoted_type));
2101 else if (TREE_CODE (TYPE_NAME (promoted_type)) == TYPE_DECL
2102 && DECL_NAME (TYPE_NAME (promoted_type)))
2103 pname = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (promoted_type)));
2106 error ("`%s' is promoted to `%s' when passed through `...'", name, pname);
2110 error ("(so you should pass `%s' not `%s' to `va_arg')", pname, name);
2117 /* Make it easier for the backends by protecting the valist argument
2118 from multiple evaluations. */
2119 valist = stabilize_va_list (valist, 0);
2121 #ifdef EXPAND_BUILTIN_VA_ARG
2122 addr = EXPAND_BUILTIN_VA_ARG (valist, type);
2124 addr = std_expand_builtin_va_arg (valist, type);
2128 result = gen_rtx_MEM (TYPE_MODE (type), addr);
2129 MEM_ALIAS_SET (result) = get_varargs_alias_set ();
2134 /* Expand ARGLIST, from a call to __builtin_va_end. */
2136 expand_builtin_va_end (arglist)
2139 tree valist = TREE_VALUE (arglist);
2141 #ifdef EXPAND_BUILTIN_VA_END
2142 valist = stabilize_va_list (valist, 0);
2143 EXPAND_BUILTIN_VA_END(arglist);
2145 /* Evaluate for side effects, if needed. I hate macros that don't
2147 if (TREE_SIDE_EFFECTS (valist))
2148 expand_expr (valist, const0_rtx, VOIDmode, EXPAND_NORMAL);
2154 /* Expand ARGLIST, from a call to __builtin_va_copy. We do this as a
2155 builtin rather than just as an assignment in stdarg.h because of the
2156 nastiness of array-type va_list types. */
2158 expand_builtin_va_copy (arglist)
2163 dst = TREE_VALUE (arglist);
2164 src = TREE_VALUE (TREE_CHAIN (arglist));
2166 dst = stabilize_va_list (dst, 1);
2167 src = stabilize_va_list (src, 0);
2169 if (TREE_CODE (va_list_type_node) != ARRAY_TYPE)
2171 t = build (MODIFY_EXPR, va_list_type_node, dst, src);
2172 TREE_SIDE_EFFECTS (t) = 1;
2173 expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
2177 rtx dstb, srcb, size;
2179 /* Evaluate to pointers. */
2180 dstb = expand_expr (dst, NULL_RTX, Pmode, EXPAND_NORMAL);
2181 srcb = expand_expr (src, NULL_RTX, Pmode, EXPAND_NORMAL);
2182 size = expand_expr (TYPE_SIZE_UNIT (va_list_type_node), NULL_RTX,
2183 VOIDmode, EXPAND_NORMAL);
2185 /* "Dereference" to BLKmode memories. */
2186 dstb = gen_rtx_MEM (BLKmode, dstb);
2187 MEM_ALIAS_SET (dstb) = get_alias_set (TREE_TYPE (TREE_TYPE (dst)));
2188 srcb = gen_rtx_MEM (BLKmode, srcb);
2189 MEM_ALIAS_SET (srcb) = get_alias_set (TREE_TYPE (TREE_TYPE (src)));
2192 emit_block_move (dstb, srcb, size,
2193 TYPE_ALIGN (va_list_type_node) / BITS_PER_UNIT);
2199 /* Expand a call to one of the builtin functions __builtin_frame_address or
2200 __builtin_return_address. */
2202 expand_builtin_frame_address (exp)
2205 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
2206 tree arglist = TREE_OPERAND (exp, 1);
2208 /* The argument must be a nonnegative integer constant.
2209 It counts the number of frames to scan up the stack.
2210 The value is the return address saved in that frame. */
2212 /* Warning about missing arg was already issued. */
2214 else if (TREE_CODE (TREE_VALUE (arglist)) != INTEGER_CST
2215 || tree_int_cst_sgn (TREE_VALUE (arglist)) < 0)
2217 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
2218 error ("invalid arg to `__builtin_frame_address'");
2220 error ("invalid arg to `__builtin_return_address'");
2225 rtx tem = expand_builtin_return_addr (DECL_FUNCTION_CODE (fndecl),
2226 TREE_INT_CST_LOW (TREE_VALUE (arglist)),
2227 hard_frame_pointer_rtx);
2229 /* Some ports cannot access arbitrary stack frames. */
2232 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
2233 warning ("unsupported arg to `__builtin_frame_address'");
2235 warning ("unsupported arg to `__builtin_return_address'");
2239 /* For __builtin_frame_address, return what we've got. */
2240 if (DECL_FUNCTION_CODE (fndecl) == BUILT_IN_FRAME_ADDRESS)
2243 if (GET_CODE (tem) != REG
2244 && ! CONSTANT_P (tem))
2245 tem = copy_to_mode_reg (Pmode, tem);
2250 /* Expand a call to the alloca builtin, with arguments ARGLIST. Return 0 if
2251 we failed and the caller should emit a normal call, otherwise try to get
2252 the result in TARGET, if convenient. */
2254 expand_builtin_alloca (arglist, target)
2261 /* Arg could be non-integer if user redeclared this fcn wrong. */
2262 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != INTEGER_TYPE)
2265 /* Compute the argument. */
2266 op0 = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
2268 /* Allocate the desired space. */
2269 return allocate_dynamic_stack_space (op0, target, BITS_PER_UNIT);
2272 /* Expand a call to the ffs builtin. The arguments are in ARGLIST.
2273 Return 0 if a normal call should be emitted rather than expanding the
2274 function in-line. If convenient, the result should be placed in TARGET.
2275 SUBTARGET may be used as the target for computing one of EXP's operands. */
2277 expand_builtin_ffs (arglist, target, subtarget)
2279 rtx target, subtarget;
2283 /* Arg could be non-integer if user redeclared this fcn wrong. */
2284 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != INTEGER_TYPE)
2287 /* Compute the argument. */
2288 op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
2289 /* Compute ffs, into TARGET if possible.
2290 Set TARGET to wherever the result comes back. */
2291 target = expand_unop (TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist))),
2292 ffs_optab, op0, target, 1);
2298 /* Expand an expression EXP that calls a built-in function,
2299 with result going to TARGET if that's convenient
2300 (and in mode MODE if that's convenient).
2301 SUBTARGET may be used as the target for computing one of EXP's operands.
2302 IGNORE is nonzero if the value is to be ignored. */
2305 expand_builtin (exp, target, subtarget, mode, ignore)
2309 enum machine_mode mode;
2312 tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
2313 tree arglist = TREE_OPERAND (exp, 1);
2314 enum built_in_function fcode = DECL_FUNCTION_CODE (fndecl);
2316 #ifdef MD_EXPAND_BUILTIN
2317 if (DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_MD)
2318 return MD_EXPAND_BUILTIN (exp, target, subtarget, mode, ignore);
2321 /* When not optimizing, generate calls to library functions for a certain
2323 if (! optimize && ! CALLED_AS_BUILT_IN (fndecl)
2324 && (fcode == BUILT_IN_SIN || fcode == BUILT_IN_COS
2325 || fcode == BUILT_IN_FSQRT || fcode == BUILT_IN_MEMSET
2326 || fcode == BUILT_IN_MEMCPY || fcode == BUILT_IN_MEMCMP
2327 || fcode == BUILT_IN_STRLEN || fcode == BUILT_IN_STRCPY
2328 || fcode == BUILT_IN_STRCMP || fcode == BUILT_IN_FFS))
2329 return expand_call (exp, target, ignore);
2336 /* build_function_call changes these into ABS_EXPR. */
2341 /* Treat these like sqrt, but only if the user asks for them. */
2342 if (! flag_fast_math)
2344 case BUILT_IN_FSQRT:
2345 target = expand_builtin_mathfn (exp, target, subtarget);
2353 case BUILT_IN_APPLY_ARGS:
2354 return expand_builtin_apply_args ();
2356 /* __builtin_apply (FUNCTION, ARGUMENTS, ARGSIZE) invokes
2357 FUNCTION with a copy of the parameters described by
2358 ARGUMENTS, and ARGSIZE. It returns a block of memory
2359 allocated on the stack into which is stored all the registers
2360 that might possibly be used for returning the result of a
2361 function. ARGUMENTS is the value returned by
2362 __builtin_apply_args. ARGSIZE is the number of bytes of
2363 arguments that must be copied. ??? How should this value be
2364 computed? We'll also need a safe worst case value for varargs
2366 case BUILT_IN_APPLY:
2368 /* Arg could be non-pointer if user redeclared this fcn wrong. */
2369 || ! POINTER_TYPE_P (TREE_TYPE (TREE_VALUE (arglist)))
2370 || TREE_CHAIN (arglist) == 0
2371 || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (arglist)))) != POINTER_TYPE
2372 || TREE_CHAIN (TREE_CHAIN (arglist)) == 0
2373 || TREE_CODE (TREE_TYPE (TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))))) != INTEGER_TYPE)
2381 for (t = arglist, i = 0; t; t = TREE_CHAIN (t), i++)
2382 ops[i] = expand_expr (TREE_VALUE (t), NULL_RTX, VOIDmode, 0);
2384 return expand_builtin_apply (ops[0], ops[1], ops[2]);
2387 /* __builtin_return (RESULT) causes the function to return the
2388 value described by RESULT. RESULT is address of the block of
2389 memory returned by __builtin_apply. */
2390 case BUILT_IN_RETURN:
2392 /* Arg could be non-pointer if user redeclared this fcn wrong. */
2393 && TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) == POINTER_TYPE)
2394 expand_builtin_return (expand_expr (TREE_VALUE (arglist),
2395 NULL_RTX, VOIDmode, 0));
2398 case BUILT_IN_SAVEREGS:
2399 return expand_builtin_saveregs ();
2401 case BUILT_IN_ARGS_INFO:
2402 return expand_builtin_args_info (exp);
2404 /* Return the address of the first anonymous stack arg. */
2405 case BUILT_IN_NEXT_ARG:
2406 return expand_builtin_next_arg (arglist);
2408 case BUILT_IN_CLASSIFY_TYPE:
2409 return expand_builtin_classify_type (arglist);
2411 case BUILT_IN_CONSTANT_P:
2412 return expand_builtin_constant_p (exp);
2414 case BUILT_IN_FRAME_ADDRESS:
2415 case BUILT_IN_RETURN_ADDRESS:
2416 return expand_builtin_frame_address (exp);
2418 /* Returns the address of the area where the structure is returned.
2420 case BUILT_IN_AGGREGATE_INCOMING_ADDRESS:
2422 || ! AGGREGATE_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl)))
2423 || GET_CODE (DECL_RTL (DECL_RESULT (current_function_decl))) != MEM)
2426 return XEXP (DECL_RTL (DECL_RESULT (current_function_decl)), 0);
2428 case BUILT_IN_ALLOCA:
2429 target = expand_builtin_alloca (arglist, target);
2435 target = expand_builtin_ffs (arglist, target, subtarget);
2440 case BUILT_IN_STRLEN:
2441 target = expand_builtin_strlen (exp, target, mode);
2446 case BUILT_IN_STRCPY:
2447 target = expand_builtin_strcpy (exp);
2452 case BUILT_IN_MEMCPY:
2453 target = expand_builtin_memcpy (arglist);
2458 case BUILT_IN_MEMSET:
2459 target = expand_builtin_memset (exp);
2464 /* These comparison functions need an instruction that returns an actual
2465 index. An ordinary compare that just sets the condition codes
2467 #ifdef HAVE_cmpstrsi
2468 case BUILT_IN_STRCMP:
2469 target = expand_builtin_strcmp (exp, target);
2474 case BUILT_IN_MEMCMP:
2475 target = expand_builtin_memcmp (exp, arglist, target);
2480 case BUILT_IN_STRCMP:
2481 case BUILT_IN_MEMCMP:
2485 case BUILT_IN_SETJMP:
2487 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE)
2491 rtx buf_addr = expand_expr (TREE_VALUE (arglist), subtarget,
2493 rtx lab = gen_label_rtx ();
2494 rtx ret = expand_builtin_setjmp (buf_addr, target, lab, lab);
2499 /* __builtin_longjmp is passed a pointer to an array of five words.
2500 It's similar to the C library longjmp function but works with
2501 __builtin_setjmp above. */
2502 case BUILT_IN_LONGJMP:
2503 if (arglist == 0 || TREE_CHAIN (arglist) == 0
2504 || TREE_CODE (TREE_TYPE (TREE_VALUE (arglist))) != POINTER_TYPE)
2508 rtx buf_addr = expand_expr (TREE_VALUE (arglist), subtarget,
2510 rtx value = expand_expr (TREE_VALUE (TREE_CHAIN (arglist)),
2511 NULL_RTX, VOIDmode, 0);
2513 if (value != const1_rtx)
2515 error ("__builtin_longjmp second argument must be 1");
2519 expand_builtin_longjmp (buf_addr, value);
2526 emit_insn (gen_trap ());
2529 error ("__builtin_trap not supported by this target");
2533 /* Various hooks for the DWARF 2 __throw routine. */
2534 case BUILT_IN_UNWIND_INIT:
2535 expand_builtin_unwind_init ();
2537 case BUILT_IN_DWARF_CFA:
2538 return virtual_cfa_rtx;
2539 #ifdef DWARF2_UNWIND_INFO
2540 case BUILT_IN_DWARF_FP_REGNUM:
2541 return expand_builtin_dwarf_fp_regnum ();
2542 case BUILT_IN_INIT_DWARF_REG_SIZES:
2543 expand_builtin_init_dwarf_reg_sizes (TREE_VALUE (arglist));
2546 case BUILT_IN_FROB_RETURN_ADDR:
2547 return expand_builtin_frob_return_addr (TREE_VALUE (arglist));
2548 case BUILT_IN_EXTRACT_RETURN_ADDR:
2549 return expand_builtin_extract_return_addr (TREE_VALUE (arglist));
2550 case BUILT_IN_EH_RETURN:
2551 expand_builtin_eh_return (TREE_VALUE (arglist),
2552 TREE_VALUE (TREE_CHAIN (arglist)),
2553 TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist))));
2555 case BUILT_IN_VARARGS_START:
2556 return expand_builtin_va_start (0, arglist);
2557 case BUILT_IN_STDARG_START:
2558 return expand_builtin_va_start (1, arglist);
2559 case BUILT_IN_VA_END:
2560 return expand_builtin_va_end (arglist);
2561 case BUILT_IN_VA_COPY:
2562 return expand_builtin_va_copy (arglist);
2564 default: /* just do library call, if unknown builtin */
2565 error ("built-in function `%s' not currently supported",
2566 IDENTIFIER_POINTER (DECL_NAME (fndecl)));
2569 /* The switch statement above can drop through to cause the function
2570 to be called normally. */
2571 return expand_call (exp, target, ignore);