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/* Expand builtin functions.
Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
1999, 2000, 2001, 2002 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#include "config.h"
#include "system.h"
#include "machmode.h"
#include "real.h"
#include "rtl.h"
#include "tree.h"
#include "flags.h"
#include "regs.h"
#include "hard-reg-set.h"
#include "except.h"
#include "function.h"
#include "insn-config.h"
#include "expr.h"
#include "optabs.h"
#include "libfuncs.h"
#include "recog.h"
#include "output.h"
#include "typeclass.h"
#include "toplev.h"
#include "predict.h"
#include "tm_p.h"
#include "target.h"
#include "langhooks.h"
#define CALLED_AS_BUILT_IN(NODE) \
(!strncmp (IDENTIFIER_POINTER (DECL_NAME (NODE)), "__builtin_", 10))
/* Register mappings for target machines without register windows. */
#ifndef INCOMING_REGNO
#define INCOMING_REGNO(OUT) (OUT)
#endif
#ifndef OUTGOING_REGNO
#define OUTGOING_REGNO(IN) (IN)
#endif
#ifndef PAD_VARARGS_DOWN
#define PAD_VARARGS_DOWN BYTES_BIG_ENDIAN
#endif
/* Define the names of the builtin function types and codes. */
const char *const built_in_class_names[4]
= {"NOT_BUILT_IN", "BUILT_IN_FRONTEND", "BUILT_IN_MD", "BUILT_IN_NORMAL"};
#define DEF_BUILTIN(X, N, C, T, LT, B, F, NA, AT) STRINGX(X),
const char *const built_in_names[(int) END_BUILTINS] =
{
#include "builtins.def"
};
#undef DEF_BUILTIN
/* Setup an array of _DECL trees, make sure each element is
initialized to NULL_TREE. */
tree built_in_decls[(int) END_BUILTINS];
static int get_pointer_alignment PARAMS ((tree, unsigned int));
static tree c_strlen PARAMS ((tree));
static const char *c_getstr PARAMS ((tree));
static rtx c_readstr PARAMS ((const char *,
enum machine_mode));
static int target_char_cast PARAMS ((tree, char *));
static rtx get_memory_rtx PARAMS ((tree));
static int apply_args_size PARAMS ((void));
static int apply_result_size PARAMS ((void));
#if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
static rtx result_vector PARAMS ((int, rtx));
#endif
static rtx expand_builtin_setjmp PARAMS ((tree, rtx));
static void expand_builtin_prefetch PARAMS ((tree));
static rtx expand_builtin_apply_args PARAMS ((void));
static rtx expand_builtin_apply_args_1 PARAMS ((void));
static rtx expand_builtin_apply PARAMS ((rtx, rtx, rtx));
static void expand_builtin_return PARAMS ((rtx));
static enum type_class type_to_class PARAMS ((tree));
static rtx expand_builtin_classify_type PARAMS ((tree));
static rtx expand_builtin_mathfn PARAMS ((tree, rtx, rtx));
static rtx expand_builtin_constant_p PARAMS ((tree));
static rtx expand_builtin_args_info PARAMS ((tree));
static rtx expand_builtin_next_arg PARAMS ((tree));
static rtx expand_builtin_va_start PARAMS ((tree));
static rtx expand_builtin_va_end PARAMS ((tree));
static rtx expand_builtin_va_copy PARAMS ((tree));
static rtx expand_builtin_memcmp PARAMS ((tree, tree, rtx,
enum machine_mode));
static rtx expand_builtin_strcmp PARAMS ((tree, rtx,
enum machine_mode));
static rtx expand_builtin_strncmp PARAMS ((tree, rtx,
enum machine_mode));
static rtx builtin_memcpy_read_str PARAMS ((PTR, HOST_WIDE_INT,
enum machine_mode));
static rtx expand_builtin_strcat PARAMS ((tree, rtx,
enum machine_mode));
static rtx expand_builtin_strncat PARAMS ((tree, rtx,
enum machine_mode));
static rtx expand_builtin_strspn PARAMS ((tree, rtx,
enum machine_mode));
static rtx expand_builtin_strcspn PARAMS ((tree, rtx,
enum machine_mode));
static rtx expand_builtin_memcpy PARAMS ((tree, rtx,
enum machine_mode));
static rtx expand_builtin_strcpy PARAMS ((tree, rtx,
enum machine_mode));
static rtx builtin_strncpy_read_str PARAMS ((PTR, HOST_WIDE_INT,
enum machine_mode));
static rtx expand_builtin_strncpy PARAMS ((tree, rtx,
enum machine_mode));
static rtx builtin_memset_read_str PARAMS ((PTR, HOST_WIDE_INT,
enum machine_mode));
static rtx builtin_memset_gen_str PARAMS ((PTR, HOST_WIDE_INT,
enum machine_mode));
static rtx expand_builtin_memset PARAMS ((tree, rtx,
enum machine_mode));
static rtx expand_builtin_bzero PARAMS ((tree));
static rtx expand_builtin_strlen PARAMS ((tree, rtx));
static rtx expand_builtin_strstr PARAMS ((tree, rtx,
enum machine_mode));
static rtx expand_builtin_strpbrk PARAMS ((tree, rtx,
enum machine_mode));
static rtx expand_builtin_strchr PARAMS ((tree, rtx,
enum machine_mode));
static rtx expand_builtin_strrchr PARAMS ((tree, rtx,
enum machine_mode));
static rtx expand_builtin_alloca PARAMS ((tree, rtx));
static rtx expand_builtin_ffs PARAMS ((tree, rtx, rtx));
static rtx expand_builtin_frame_address PARAMS ((tree));
static rtx expand_builtin_fputs PARAMS ((tree, int, int));
static tree stabilize_va_list PARAMS ((tree, int));
static rtx expand_builtin_expect PARAMS ((tree, rtx));
static tree fold_builtin_constant_p PARAMS ((tree));
static tree fold_builtin_classify_type PARAMS ((tree));
static tree fold_builtin_inf PARAMS ((tree, int));
static tree fold_builtin_nan PARAMS ((tree, tree, int));
static tree build_function_call_expr PARAMS ((tree, tree));
static int validate_arglist PARAMS ((tree, ...));
/* Return the alignment in bits of EXP, a pointer valued expression.
But don't return more than MAX_ALIGN no matter what.
The alignment returned is, by default, the alignment of the thing that
EXP points to. If it is not a POINTER_TYPE, 0 is returned.
Otherwise, look at the expression to see if we can do better, i.e., if the
expression is actually pointing at an object whose alignment is tighter. */
static int
get_pointer_alignment (exp, max_align)
tree exp;
unsigned int max_align;
{
unsigned int align, inner;
if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
return 0;
align = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
align = MIN (align, max_align);
while (1)
{
switch (TREE_CODE (exp))
{
case NOP_EXPR:
case CONVERT_EXPR:
case NON_LVALUE_EXPR:
exp = TREE_OPERAND (exp, 0);
if (TREE_CODE (TREE_TYPE (exp)) != POINTER_TYPE)
return align;
inner = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
align = MIN (inner, max_align);
break;
case PLUS_EXPR:
/* If sum of pointer + int, restrict our maximum alignment to that
imposed by the integer. If not, we can't do any better than
ALIGN. */
if (! host_integerp (TREE_OPERAND (exp, 1), 1))
return align;
while (((tree_low_cst (TREE_OPERAND (exp, 1), 1))
& (max_align / BITS_PER_UNIT - 1))
!= 0)
max_align >>= 1;
exp = TREE_OPERAND (exp, 0);
break;
case ADDR_EXPR:
/* See what we are pointing at and look at its alignment. */
exp = TREE_OPERAND (exp, 0);
if (TREE_CODE (exp) == FUNCTION_DECL)
align = FUNCTION_BOUNDARY;
else if (DECL_P (exp))
align = DECL_ALIGN (exp);
#ifdef CONSTANT_ALIGNMENT
else if (TREE_CODE_CLASS (TREE_CODE (exp)) == 'c')
align = CONSTANT_ALIGNMENT (exp, align);
#endif
return MIN (align, max_align);
default:
return align;
}
}
}
/* Compute the length of a C string. TREE_STRING_LENGTH is not the right
way, because it could contain a zero byte in the middle.
TREE_STRING_LENGTH is the size of the character array, not the string.
The value returned is of type `ssizetype'.
Unfortunately, string_constant can't access the values of const char
arrays with initializers, so neither can we do so here. */
static tree
c_strlen (src)
tree src;
{
tree offset_node;
HOST_WIDE_INT offset;
int max;
const char *ptr;
src = string_constant (src, &offset_node);
if (src == 0)
return 0;
max = TREE_STRING_LENGTH (src) - 1;
ptr = TREE_STRING_POINTER (src);
if (offset_node && TREE_CODE (offset_node) != INTEGER_CST)
{
/* If the string has an internal zero byte (e.g., "foo\0bar"), we can't
compute the offset to the following null if we don't know where to
start searching for it. */
int i;
for (i = 0; i < max; i++)
if (ptr[i] == 0)
return 0;
/* We don't know the starting offset, but we do know that the string
has no internal zero bytes. We can assume that the offset falls
within the bounds of the string; otherwise, the programmer deserves
what he gets. Subtract the offset from the length of the string,
and return that. This would perhaps not be valid if we were dealing
with named arrays in addition to literal string constants. */
return size_diffop (size_int (max), offset_node);
}
/* We have a known offset into the string. Start searching there for
a null character if we can represent it as a single HOST_WIDE_INT. */
if (offset_node == 0)
offset = 0;
else if (! host_integerp (offset_node, 0))
offset = -1;
else
offset = tree_low_cst (offset_node, 0);
/* If the offset is known to be out of bounds, warn, and call strlen at
runtime. */
if (offset < 0 || offset > max)
{
warning ("offset outside bounds of constant string");
return 0;
}
/* Use strlen to search for the first zero byte. Since any strings
constructed with build_string will have nulls appended, we win even
if we get handed something like (char[4])"abcd".
Since OFFSET is our starting index into the string, no further
calculation is needed. */
return ssize_int (strlen (ptr + offset));
}
/* Return a char pointer for a C string if it is a string constant
or sum of string constant and integer constant. */
static const char *
c_getstr (src)
tree src;
{
tree offset_node;
src = string_constant (src, &offset_node);
if (src == 0)
return 0;
if (offset_node == 0)
return TREE_STRING_POINTER (src);
else if (!host_integerp (offset_node, 1)
|| compare_tree_int (offset_node, TREE_STRING_LENGTH (src) - 1) > 0)
return 0;
return TREE_STRING_POINTER (src) + tree_low_cst (offset_node, 1);
}
/* Return a CONST_INT or CONST_DOUBLE corresponding to target reading
GET_MODE_BITSIZE (MODE) bits from string constant STR. */
static rtx
c_readstr (str, mode)
const char *str;
enum machine_mode mode;
{
HOST_WIDE_INT c[2];
HOST_WIDE_INT ch;
unsigned int i, j;
if (GET_MODE_CLASS (mode) != MODE_INT)
abort ();
c[0] = 0;
c[1] = 0;
ch = 1;
for (i = 0; i < GET_MODE_SIZE (mode); i++)
{
j = i;
if (WORDS_BIG_ENDIAN)
j = GET_MODE_SIZE (mode) - i - 1;
if (BYTES_BIG_ENDIAN != WORDS_BIG_ENDIAN
&& GET_MODE_SIZE (mode) > UNITS_PER_WORD)
j = j + UNITS_PER_WORD - 2 * (j % UNITS_PER_WORD) - 1;
j *= BITS_PER_UNIT;
if (j > 2 * HOST_BITS_PER_WIDE_INT)
abort ();
if (ch)
ch = (unsigned char) str[i];
c[j / HOST_BITS_PER_WIDE_INT] |= ch << (j % HOST_BITS_PER_WIDE_INT);
}
return immed_double_const (c[0], c[1], mode);
}
/* Cast a target constant CST to target CHAR and if that value fits into
host char type, return zero and put that value into variable pointed by
P. */
static int
target_char_cast (cst, p)
tree cst;
char *p;
{
unsigned HOST_WIDE_INT val, hostval;
if (!host_integerp (cst, 1)
|| CHAR_TYPE_SIZE > HOST_BITS_PER_WIDE_INT)
return 1;
val = tree_low_cst (cst, 1);
if (CHAR_TYPE_SIZE < HOST_BITS_PER_WIDE_INT)
val &= (((unsigned HOST_WIDE_INT) 1) << CHAR_TYPE_SIZE) - 1;
hostval = val;
if (HOST_BITS_PER_CHAR < HOST_BITS_PER_WIDE_INT)
hostval &= (((unsigned HOST_WIDE_INT) 1) << HOST_BITS_PER_CHAR) - 1;
if (val != hostval)
return 1;
*p = hostval;
return 0;
}
/* Given TEM, a pointer to a stack frame, follow the dynamic chain COUNT
times to get the address of either a higher stack frame, or a return
address located within it (depending on FNDECL_CODE). */
rtx
expand_builtin_return_addr (fndecl_code, count, tem)
enum built_in_function fndecl_code;
int count;
rtx tem;
{
int i;
/* Some machines need special handling before we can access
arbitrary frames. For example, on the sparc, we must first flush
all register windows to the stack. */
#ifdef SETUP_FRAME_ADDRESSES
if (count > 0)
SETUP_FRAME_ADDRESSES ();
#endif
/* On the sparc, the return address is not in the frame, it is in a
register. There is no way to access it off of the current frame
pointer, but it can be accessed off the previous frame pointer by
reading the value from the register window save area. */
#ifdef RETURN_ADDR_IN_PREVIOUS_FRAME
if (fndecl_code == BUILT_IN_RETURN_ADDRESS)
count--;
#endif
/* Scan back COUNT frames to the specified frame. */
for (i = 0; i < count; i++)
{
/* Assume the dynamic chain pointer is in the word that the
frame address points to, unless otherwise specified. */
#ifdef DYNAMIC_CHAIN_ADDRESS
tem = DYNAMIC_CHAIN_ADDRESS (tem);
#endif
tem = memory_address (Pmode, tem);
tem = gen_rtx_MEM (Pmode, tem);
set_mem_alias_set (tem, get_frame_alias_set ());
tem = copy_to_reg (tem);
}
/* For __builtin_frame_address, return what we've got. */
if (fndecl_code == BUILT_IN_FRAME_ADDRESS)
return tem;
/* For __builtin_return_address, Get the return address from that
frame. */
#ifdef RETURN_ADDR_RTX
tem = RETURN_ADDR_RTX (count, tem);
#else
tem = memory_address (Pmode,
plus_constant (tem, GET_MODE_SIZE (Pmode)));
tem = gen_rtx_MEM (Pmode, tem);
set_mem_alias_set (tem, get_frame_alias_set ());
#endif
return tem;
}
/* Alias set used for setjmp buffer. */
static HOST_WIDE_INT setjmp_alias_set = -1;
/* Construct the leading half of a __builtin_setjmp call. Control will
return to RECEIVER_LABEL. This is used directly by sjlj exception
handling code. */
void
expand_builtin_setjmp_setup (buf_addr, receiver_label)
rtx buf_addr;
rtx receiver_label;
{
enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
rtx stack_save;
rtx mem;
if (setjmp_alias_set == -1)
setjmp_alias_set = new_alias_set ();
#ifdef POINTERS_EXTEND_UNSIGNED
if (GET_MODE (buf_addr) != Pmode)
buf_addr = convert_memory_address (Pmode, buf_addr);
#endif
buf_addr = force_reg (Pmode, force_operand (buf_addr, NULL_RTX));
emit_queue ();
/* We store the frame pointer and the address of receiver_label in
the buffer and use the rest of it for the stack save area, which
is machine-dependent. */
#ifndef BUILTIN_SETJMP_FRAME_VALUE
#define BUILTIN_SETJMP_FRAME_VALUE virtual_stack_vars_rtx
#endif
mem = gen_rtx_MEM (Pmode, buf_addr);
set_mem_alias_set (mem, setjmp_alias_set);
emit_move_insn (mem, BUILTIN_SETJMP_FRAME_VALUE);
mem = gen_rtx_MEM (Pmode, plus_constant (buf_addr, GET_MODE_SIZE (Pmode))),
set_mem_alias_set (mem, setjmp_alias_set);
emit_move_insn (validize_mem (mem),
force_reg (Pmode, gen_rtx_LABEL_REF (Pmode, receiver_label)));
stack_save = gen_rtx_MEM (sa_mode,
plus_constant (buf_addr,
2 * GET_MODE_SIZE (Pmode)));
set_mem_alias_set (stack_save, setjmp_alias_set);
emit_stack_save (SAVE_NONLOCAL, &stack_save, NULL_RTX);
/* If there is further processing to do, do it. */
#ifdef HAVE_builtin_setjmp_setup
if (HAVE_builtin_setjmp_setup)
emit_insn (gen_builtin_setjmp_setup (buf_addr));
#endif
/* Tell optimize_save_area_alloca that extra work is going to
need to go on during alloca. */
current_function_calls_setjmp = 1;
/* Set this so all the registers get saved in our frame; we need to be
able to copy the saved values for any registers from frames we unwind. */
current_function_has_nonlocal_label = 1;
}
/* Construct the trailing part of a __builtin_setjmp call.
This is used directly by sjlj exception handling code. */
void
expand_builtin_setjmp_receiver (receiver_label)
rtx receiver_label ATTRIBUTE_UNUSED;
{
/* Clobber the FP when we get here, so we have to make sure it's
marked as used by this function. */
emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
/* Mark the static chain as clobbered here so life information
doesn't get messed up for it. */
emit_insn (gen_rtx_CLOBBER (VOIDmode, static_chain_rtx));
/* Now put in the code to restore the frame pointer, and argument
pointer, if needed. The code below is from expand_end_bindings
in stmt.c; see detailed documentation there. */
#ifdef HAVE_nonlocal_goto
if (! HAVE_nonlocal_goto)
#endif
emit_move_insn (virtual_stack_vars_rtx, hard_frame_pointer_rtx);
#if ARG_POINTER_REGNUM != HARD_FRAME_POINTER_REGNUM
if (fixed_regs[ARG_POINTER_REGNUM])
{
#ifdef ELIMINABLE_REGS
size_t i;
static const struct elims {const int from, to;} elim_regs[] = ELIMINABLE_REGS;
for (i = 0; i < ARRAY_SIZE (elim_regs); i++)
if (elim_regs[i].from == ARG_POINTER_REGNUM
&& elim_regs[i].to == HARD_FRAME_POINTER_REGNUM)
break;
if (i == ARRAY_SIZE (elim_regs))
#endif
{
/* Now restore our arg pointer from the address at which it
was saved in our stack frame. */
emit_move_insn (virtual_incoming_args_rtx,
copy_to_reg (get_arg_pointer_save_area (cfun)));
}
}
#endif
#ifdef HAVE_builtin_setjmp_receiver
if (HAVE_builtin_setjmp_receiver)
emit_insn (gen_builtin_setjmp_receiver (receiver_label));
else
#endif
#ifdef HAVE_nonlocal_goto_receiver
if (HAVE_nonlocal_goto_receiver)
emit_insn (gen_nonlocal_goto_receiver ());
else
#endif
{ /* Nothing */ }
/* @@@ This is a kludge. Not all machine descriptions define a blockage
insn, but we must not allow the code we just generated to be reordered
by scheduling. Specifically, the update of the frame pointer must
happen immediately, not later. So emit an ASM_INPUT to act as blockage
insn. */
emit_insn (gen_rtx_ASM_INPUT (VOIDmode, ""));
}
/* __builtin_setjmp is passed a pointer to an array of five words (not
all will be used on all machines). It operates similarly to the C
library function of the same name, but is more efficient. Much of
the code below (and for longjmp) is copied from the handling of
non-local gotos.
NOTE: This is intended for use by GNAT and the exception handling
scheme in the compiler and will only work in the method used by
them. */
static rtx
expand_builtin_setjmp (arglist, target)
tree arglist;
rtx target;
{
rtx buf_addr, next_lab, cont_lab;
if (!validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
return NULL_RTX;
if (target == 0 || GET_CODE (target) != REG
|| REGNO (target) < FIRST_PSEUDO_REGISTER)
target = gen_reg_rtx (TYPE_MODE (integer_type_node));
buf_addr = expand_expr (TREE_VALUE (arglist), NULL_RTX, VOIDmode, 0);
next_lab = gen_label_rtx ();
cont_lab = gen_label_rtx ();
expand_builtin_setjmp_setup (buf_addr, next_lab);
/* Set TARGET to zero and branch to the continue label. */
emit_move_insn (target, const0_rtx);
emit_jump_insn (gen_jump (cont_lab));
emit_barrier ();
emit_label (next_lab);
expand_builtin_setjmp_receiver (next_lab);
/* Set TARGET to one. */
emit_move_insn (target, const1_rtx);
emit_label (cont_lab);
/* Tell flow about the strange goings on. Putting `next_lab' on
`nonlocal_goto_handler_labels' to indicates that function
calls may traverse the arc back to this label. */
current_function_has_nonlocal_label = 1;
nonlocal_goto_handler_labels
= gen_rtx_EXPR_LIST (VOIDmode, next_lab, nonlocal_goto_handler_labels);
return target;
}
/* __builtin_longjmp is passed a pointer to an array of five words (not
all will be used on all machines). It operates similarly to the C
library function of the same name, but is more efficient. Much of
the code below is copied from the handling of non-local gotos.
NOTE: This is intended for use by GNAT and the exception handling
scheme in the compiler and will only work in the method used by
them. */
void
expand_builtin_longjmp (buf_addr, value)
rtx buf_addr, value;
{
rtx fp, lab, stack, insn, last;
enum machine_mode sa_mode = STACK_SAVEAREA_MODE (SAVE_NONLOCAL);
if (setjmp_alias_set == -1)
setjmp_alias_set = new_alias_set ();
#ifdef POINTERS_EXTEND_UNSIGNED
if (GET_MODE (buf_addr) != Pmode)
buf_addr = convert_memory_address (Pmode, buf_addr);
#endif
buf_addr = force_reg (Pmode, buf_addr);
/* We used to store value in static_chain_rtx, but that fails if pointers
are smaller than integers. We instead require that the user must pass
a second argument of 1, because that is what builtin_setjmp will
return. This also makes EH slightly more efficient, since we are no
longer copying around a value that we don't care about. */
if (value != const1_rtx)
abort ();
current_function_calls_longjmp = 1;
last = get_last_insn ();
#ifdef HAVE_builtin_longjmp
if (HAVE_builtin_longjmp)
emit_insn (gen_builtin_longjmp (buf_addr));
else
#endif
{
fp = gen_rtx_MEM (Pmode, buf_addr);
lab = gen_rtx_MEM (Pmode, plus_constant (buf_addr,
GET_MODE_SIZE (Pmode)));
stack = gen_rtx_MEM (sa_mode, plus_constant (buf_addr,
2 * GET_MODE_SIZE (Pmode)));
set_mem_alias_set (fp, setjmp_alias_set);
set_mem_alias_set (lab, setjmp_alias_set);
set_mem_alias_set (stack, setjmp_alias_set);
/* Pick up FP, label, and SP from the block and jump. This code is
from expand_goto in stmt.c; see there for detailed comments. */
#if HAVE_nonlocal_goto
if (HAVE_nonlocal_goto)
/* We have to pass a value to the nonlocal_goto pattern that will
get copied into the static_chain pointer, but it does not matter
what that value is, because builtin_setjmp does not use it. */
emit_insn (gen_nonlocal_goto (value, lab, stack, fp));
else
#endif
{
lab = copy_to_reg (lab);
emit_move_insn (hard_frame_pointer_rtx, fp);
emit_stack_restore (SAVE_NONLOCAL, stack, NULL_RTX);
emit_insn (gen_rtx_USE (VOIDmode, hard_frame_pointer_rtx));
emit_insn (gen_rtx_USE (VOIDmode, stack_pointer_rtx));
emit_indirect_jump (lab);
}
}
/* Search backwards and mark the jump insn as a non-local goto.
Note that this precludes the use of __builtin_longjmp to a
__builtin_setjmp target in the same function. However, we've
already cautioned the user that these functions are for
internal exception handling use only. */
for (insn = get_last_insn (); insn; insn = PREV_INSN (insn))
{
if (insn == last)
abort ();
if (GET_CODE (insn) == JUMP_INSN)
{
REG_NOTES (insn) = alloc_EXPR_LIST (REG_NON_LOCAL_GOTO, const0_rtx,
REG_NOTES (insn));
break;
}
else if (GET_CODE (insn) == CALL_INSN)
break;
}
}
/* Expand a call to __builtin_prefetch. For a target that does not support
data prefetch, evaluate the memory address argument in case it has side
effects. */
static void
expand_builtin_prefetch (arglist)
tree arglist;
{
tree arg0, arg1, arg2;
rtx op0, op1, op2;
if (!validate_arglist (arglist, POINTER_TYPE, 0))
return;
arg0 = TREE_VALUE (arglist);
/* Arguments 1 and 2 are optional; argument 1 (read/write) defaults to
zero (read) and argument 2 (locality) defaults to 3 (high degree of
locality). */
if (TREE_CHAIN (arglist))
{
arg1 = TREE_VALUE (TREE_CHAIN (arglist));
if (TREE_CHAIN (TREE_CHAIN (arglist)))
arg2 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
else
arg2 = build_int_2 (3, 0);
}
else
{
arg1 = integer_zero_node;
arg2 = build_int_2 (3, 0);
}
/* Argument 0 is an address. */
op0 = expand_expr (arg0, NULL_RTX, Pmode, EXPAND_NORMAL);
/* Argument 1 (read/write flag) must be a compile-time constant int. */
if (TREE_CODE (arg1) != INTEGER_CST)
{
error ("second arg to `__builtin_prefetch' must be a constant");
arg1 = integer_zero_node;
}
op1 = expand_expr (arg1, NULL_RTX, VOIDmode, 0);
/* Argument 1 must be either zero or one. */
if (INTVAL (op1) != 0 && INTVAL (op1) != 1)
{
warning ("invalid second arg to __builtin_prefetch; using zero");
op1 = const0_rtx;
}
/* Argument 2 (locality) must be a compile-time constant int. */
if (TREE_CODE (arg2) != INTEGER_CST)
{
error ("third arg to `__builtin_prefetch' must be a constant");
arg2 = integer_zero_node;
}
op2 = expand_expr (arg2, NULL_RTX, VOIDmode, 0);
/* Argument 2 must be 0, 1, 2, or 3. */
if (INTVAL (op2) < 0 || INTVAL (op2) > 3)
{
warning ("invalid third arg to __builtin_prefetch; using zero");
op2 = const0_rtx;
}
#ifdef HAVE_prefetch
if (HAVE_prefetch)
{
if ((! (*insn_data[(int) CODE_FOR_prefetch].operand[0].predicate)
(op0,
insn_data[(int) CODE_FOR_prefetch].operand[0].mode))
|| (GET_MODE(op0) != Pmode))
{
#ifdef POINTERS_EXTEND_UNSIGNED
if (GET_MODE(op0) != Pmode)
op0 = convert_memory_address (Pmode, op0);
#endif
op0 = force_reg (Pmode, op0);
}
emit_insn (gen_prefetch (op0, op1, op2));
}
else
#endif
op0 = protect_from_queue (op0, 0);
/* Don't do anything with direct references to volatile memory, but
generate code to handle other side effects. */
if (GET_CODE (op0) != MEM && side_effects_p (op0))
emit_insn (op0);
}
/* Get a MEM rtx for expression EXP which is the address of an operand
to be used to be used in a string instruction (cmpstrsi, movstrsi, ..). */
static rtx
get_memory_rtx (exp)
tree exp;
{
rtx addr = expand_expr (exp, NULL_RTX, ptr_mode, EXPAND_SUM);
rtx mem;
#ifdef POINTERS_EXTEND_UNSIGNED
if (GET_MODE (addr) != Pmode)
addr = convert_memory_address (Pmode, addr);
#endif
mem = gen_rtx_MEM (BLKmode, memory_address (BLKmode, addr));
/* Get an expression we can use to find the attributes to assign to MEM.
If it is an ADDR_EXPR, use the operand. Otherwise, dereference it if
we can. First remove any nops. */
while ((TREE_CODE (exp) == NOP_EXPR || TREE_CODE (exp) == CONVERT_EXPR
|| TREE_CODE (exp) == NON_LVALUE_EXPR)
&& POINTER_TYPE_P (TREE_TYPE (TREE_OPERAND (exp, 0))))
exp = TREE_OPERAND (exp, 0);
if (TREE_CODE (exp) == ADDR_EXPR)
{
exp = TREE_OPERAND (exp, 0);
set_mem_attributes (mem, exp, 0);
}
else if (POINTER_TYPE_P (TREE_TYPE (exp)))
{
exp = build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (exp)), exp);
/* memcpy, memset and other builtin stringops can alias with anything. */
set_mem_alias_set (mem, 0);
}
return mem;
}
/* Built-in functions to perform an untyped call and return. */
/* For each register that may be used for calling a function, this
gives a mode used to copy the register's value. VOIDmode indicates
the register is not used for calling a function. If the machine
has register windows, this gives only the outbound registers.
INCOMING_REGNO gives the corresponding inbound register. */
static enum machine_mode apply_args_mode[FIRST_PSEUDO_REGISTER];
/* For each register that may be used for returning values, this gives
a mode used to copy the register's value. VOIDmode indicates the
register is not used for returning values. If the machine has
register windows, this gives only the outbound registers.
INCOMING_REGNO gives the corresponding inbound register. */
static enum machine_mode apply_result_mode[FIRST_PSEUDO_REGISTER];
/* For each register that may be used for calling a function, this
gives the offset of that register into the block returned by
__builtin_apply_args. 0 indicates that the register is not
used for calling a function. */
static int apply_args_reg_offset[FIRST_PSEUDO_REGISTER];
/* Return the offset of register REGNO into the block returned by
__builtin_apply_args. This is not declared static, since it is
needed in objc-act.c. */
int
apply_args_register_offset (regno)
int regno;
{
apply_args_size ();
/* Arguments are always put in outgoing registers (in the argument
block) if such make sense. */
#ifdef OUTGOING_REGNO
regno = OUTGOING_REGNO (regno);
#endif
return apply_args_reg_offset[regno];
}
/* Return the size required for the block returned by __builtin_apply_args,
and initialize apply_args_mode. */
static int
apply_args_size ()
{
static int size = -1;
int align;
unsigned int regno;
enum machine_mode mode;
/* The values computed by this function never change. */
if (size < 0)
{
/* The first value is the incoming arg-pointer. */
size = GET_MODE_SIZE (Pmode);
/* The second value is the structure value address unless this is
passed as an "invisible" first argument. */
if (struct_value_rtx)
size += GET_MODE_SIZE (Pmode);
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
if (FUNCTION_ARG_REGNO_P (regno))
{
/* Search for the proper mode for copying this register's
value. I'm not sure this is right, but it works so far. */
enum machine_mode best_mode = VOIDmode;
for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
mode != VOIDmode;
mode = GET_MODE_WIDER_MODE (mode))
if (HARD_REGNO_MODE_OK (regno, mode)
&& HARD_REGNO_NREGS (regno, mode) == 1)
best_mode = mode;
if (best_mode == VOIDmode)
for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
mode != VOIDmode;
mode = GET_MODE_WIDER_MODE (mode))
if (HARD_REGNO_MODE_OK (regno, mode)
&& have_insn_for (SET, mode))
best_mode = mode;
if (best_mode == VOIDmode)
for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT);
mode != VOIDmode;
mode = GET_MODE_WIDER_MODE (mode))
if (HARD_REGNO_MODE_OK (regno, mode)
&& have_insn_for (SET, mode))
best_mode = mode;
if (best_mode == VOIDmode)
for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT);
mode != VOIDmode;
mode = GET_MODE_WIDER_MODE (mode))
if (HARD_REGNO_MODE_OK (regno, mode)
&& have_insn_for (SET, mode))
best_mode = mode;
mode = best_mode;
if (mode == VOIDmode)
abort ();
align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
if (size % align != 0)
size = CEIL (size, align) * align;
apply_args_reg_offset[regno] = size;
size += GET_MODE_SIZE (mode);
apply_args_mode[regno] = mode;
}
else
{
apply_args_mode[regno] = VOIDmode;
apply_args_reg_offset[regno] = 0;
}
}
return size;
}
/* Return the size required for the block returned by __builtin_apply,
and initialize apply_result_mode. */
static int
apply_result_size ()
{
static int size = -1;
int align, regno;
enum machine_mode mode;
/* The values computed by this function never change. */
if (size < 0)
{
size = 0;
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
if (FUNCTION_VALUE_REGNO_P (regno))
{
/* Search for the proper mode for copying this register's
value. I'm not sure this is right, but it works so far. */
enum machine_mode best_mode = VOIDmode;
for (mode = GET_CLASS_NARROWEST_MODE (MODE_INT);
mode != TImode;
mode = GET_MODE_WIDER_MODE (mode))
if (HARD_REGNO_MODE_OK (regno, mode))
best_mode = mode;
if (best_mode == VOIDmode)
for (mode = GET_CLASS_NARROWEST_MODE (MODE_FLOAT);
mode != VOIDmode;
mode = GET_MODE_WIDER_MODE (mode))
if (HARD_REGNO_MODE_OK (regno, mode)
&& have_insn_for (SET, mode))
best_mode = mode;
if (best_mode == VOIDmode)
for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_FLOAT);
mode != VOIDmode;
mode = GET_MODE_WIDER_MODE (mode))
if (HARD_REGNO_MODE_OK (regno, mode)
&& have_insn_for (SET, mode))
best_mode = mode;
if (best_mode == VOIDmode)
for (mode = GET_CLASS_NARROWEST_MODE (MODE_VECTOR_INT);
mode != VOIDmode;
mode = GET_MODE_WIDER_MODE (mode))
if (HARD_REGNO_MODE_OK (regno, mode)
&& have_insn_for (SET, mode))
best_mode = mode;
mode = best_mode;
if (mode == VOIDmode)
abort ();
align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
if (size % align != 0)
size = CEIL (size, align) * align;
size += GET_MODE_SIZE (mode);
apply_result_mode[regno] = mode;
}
else
apply_result_mode[regno] = VOIDmode;
/* Allow targets that use untyped_call and untyped_return to override
the size so that machine-specific information can be stored here. */
#ifdef APPLY_RESULT_SIZE
size = APPLY_RESULT_SIZE;
#endif
}
return size;
}
#if defined (HAVE_untyped_call) || defined (HAVE_untyped_return)
/* Create a vector describing the result block RESULT. If SAVEP is true,
the result block is used to save the values; otherwise it is used to
restore the values. */
static rtx
result_vector (savep, result)
int savep;
rtx result;
{
int regno, size, align, nelts;
enum machine_mode mode;
rtx reg, mem;
rtx *savevec = (rtx *) alloca (FIRST_PSEUDO_REGISTER * sizeof (rtx));
size = nelts = 0;
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
if ((mode = apply_result_mode[regno]) != VOIDmode)
{
align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
if (size % align != 0)
size = CEIL (size, align) * align;
reg = gen_rtx_REG (mode, savep ? regno : INCOMING_REGNO (regno));
mem = adjust_address (result, mode, size);
savevec[nelts++] = (savep
? gen_rtx_SET (VOIDmode, mem, reg)
: gen_rtx_SET (VOIDmode, reg, mem));
size += GET_MODE_SIZE (mode);
}
return gen_rtx_PARALLEL (VOIDmode, gen_rtvec_v (nelts, savevec));
}
#endif /* HAVE_untyped_call or HAVE_untyped_return */
/* Save the state required to perform an untyped call with the same
arguments as were passed to the current function. */
static rtx
expand_builtin_apply_args_1 ()
{
rtx registers;
int size, align, regno;
enum machine_mode mode;
/* Create a block where the arg-pointer, structure value address,
and argument registers can be saved. */
registers = assign_stack_local (BLKmode, apply_args_size (), -1);
/* Walk past the arg-pointer and structure value address. */
size = GET_MODE_SIZE (Pmode);
if (struct_value_rtx)
size += GET_MODE_SIZE (Pmode);
/* Save each register used in calling a function to the block. */
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
if ((mode = apply_args_mode[regno]) != VOIDmode)
{
rtx tem;
align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
if (size % align != 0)
size = CEIL (size, align) * align;
tem = gen_rtx_REG (mode, INCOMING_REGNO (regno));
emit_move_insn (adjust_address (registers, mode, size), tem);
size += GET_MODE_SIZE (mode);
}
/* Save the arg pointer to the block. */
emit_move_insn (adjust_address (registers, Pmode, 0),
copy_to_reg (virtual_incoming_args_rtx));
size = GET_MODE_SIZE (Pmode);
/* Save the structure value address unless this is passed as an
"invisible" first argument. */
if (struct_value_incoming_rtx)
{
emit_move_insn (adjust_address (registers, Pmode, size),
copy_to_reg (struct_value_incoming_rtx));
size += GET_MODE_SIZE (Pmode);
}
/* Return the address of the block. */
return copy_addr_to_reg (XEXP (registers, 0));
}
/* __builtin_apply_args returns block of memory allocated on
the stack into which is stored the arg pointer, structure
value address, static chain, and all the registers that might
possibly be used in performing a function call. The code is
moved to the start of the function so the incoming values are
saved. */
static rtx
expand_builtin_apply_args ()
{
/* Don't do __builtin_apply_args more than once in a function.
Save the result of the first call and reuse it. */
if (apply_args_value != 0)
return apply_args_value;
{
/* When this function is called, it means that registers must be
saved on entry to this function. So we migrate the
call to the first insn of this function. */
rtx temp;
rtx seq;
start_sequence ();
temp = expand_builtin_apply_args_1 ();
seq = get_insns ();
end_sequence ();
apply_args_value = temp;
/* Put the insns after the NOTE that starts the function.
If this is inside a start_sequence, make the outer-level insn
chain current, so the code is placed at the start of the
function. */
push_topmost_sequence ();
emit_insn_before (seq, NEXT_INSN (get_insns ()));
pop_topmost_sequence ();
return temp;
}
}
/* Perform an untyped call and save the state required to perform an
untyped return of whatever value was returned by the given function. */
static rtx
expand_builtin_apply (function, arguments, argsize)
rtx function, arguments, argsize;
{
int size, align, regno;
enum machine_mode mode;
rtx incoming_args, result, reg, dest, src, call_insn;
rtx old_stack_level = 0;
rtx call_fusage = 0;
#ifdef POINTERS_EXTEND_UNSIGNED
if (GET_MODE (arguments) != Pmode)
arguments = convert_memory_address (Pmode, arguments);
#endif
/* Create a block where the return registers can be saved. */
result = assign_stack_local (BLKmode, apply_result_size (), -1);
/* Fetch the arg pointer from the ARGUMENTS block. */
incoming_args = gen_reg_rtx (Pmode);
emit_move_insn (incoming_args, gen_rtx_MEM (Pmode, arguments));
#ifndef STACK_GROWS_DOWNWARD
incoming_args = expand_simple_binop (Pmode, MINUS, incoming_args, argsize,
incoming_args, 0, OPTAB_LIB_WIDEN);
#endif
/* Perform postincrements before actually calling the function. */
emit_queue ();
/* Push a new argument block and copy the arguments. Do not allow
the (potential) memcpy call below to interfere with our stack
manipulations. */
do_pending_stack_adjust ();
NO_DEFER_POP;
/* Save the stack with nonlocal if available */
#ifdef HAVE_save_stack_nonlocal
if (HAVE_save_stack_nonlocal)
emit_stack_save (SAVE_NONLOCAL, &old_stack_level, NULL_RTX);
else
#endif
emit_stack_save (SAVE_BLOCK, &old_stack_level, NULL_RTX);
/* Push a block of memory onto the stack to store the memory arguments.
Save the address in a register, and copy the memory arguments. ??? I
haven't figured out how the calling convention macros effect this,
but it's likely that the source and/or destination addresses in
the block copy will need updating in machine specific ways. */
dest = allocate_dynamic_stack_space (argsize, 0, BITS_PER_UNIT);
dest = gen_rtx_MEM (BLKmode, dest);
set_mem_align (dest, PARM_BOUNDARY);
src = gen_rtx_MEM (BLKmode, incoming_args);
set_mem_align (src, PARM_BOUNDARY);
emit_block_move (dest, src, argsize, BLOCK_OP_NORMAL);
/* Refer to the argument block. */
apply_args_size ();
arguments = gen_rtx_MEM (BLKmode, arguments);
set_mem_align (arguments, PARM_BOUNDARY);
/* Walk past the arg-pointer and structure value address. */
size = GET_MODE_SIZE (Pmode);
if (struct_value_rtx)
size += GET_MODE_SIZE (Pmode);
/* Restore each of the registers previously saved. Make USE insns
for each of these registers for use in making the call. */
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
if ((mode = apply_args_mode[regno]) != VOIDmode)
{
align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
if (size % align != 0)
size = CEIL (size, align) * align;
reg = gen_rtx_REG (mode, regno);
emit_move_insn (reg, adjust_address (arguments, mode, size));
use_reg (&call_fusage, reg);
size += GET_MODE_SIZE (mode);
}
/* Restore the structure value address unless this is passed as an
"invisible" first argument. */
size = GET_MODE_SIZE (Pmode);
if (struct_value_rtx)
{
rtx value = gen_reg_rtx (Pmode);
emit_move_insn (value, adjust_address (arguments, Pmode, size));
emit_move_insn (struct_value_rtx, value);
if (GET_CODE (struct_value_rtx) == REG)
use_reg (&call_fusage, struct_value_rtx);
size += GET_MODE_SIZE (Pmode);
}
/* All arguments and registers used for the call are set up by now! */
function = prepare_call_address (function, NULL_TREE, &call_fusage, 0, 0);
/* Ensure address is valid. SYMBOL_REF is already valid, so no need,
and we don't want to load it into a register as an optimization,
because prepare_call_address already did it if it should be done. */
if (GET_CODE (function) != SYMBOL_REF)
function = memory_address (FUNCTION_MODE, function);
/* Generate the actual call instruction and save the return value. */
#ifdef HAVE_untyped_call
if (HAVE_untyped_call)
emit_call_insn (gen_untyped_call (gen_rtx_MEM (FUNCTION_MODE, function),
result, result_vector (1, result)));
else
#endif
#ifdef HAVE_call_value
if (HAVE_call_value)
{
rtx valreg = 0;
/* Locate the unique return register. It is not possible to
express a call that sets more than one return register using
call_value; use untyped_call for that. In fact, untyped_call
only needs to save the return registers in the given block. */
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
if ((mode = apply_result_mode[regno]) != VOIDmode)
{
if (valreg)
abort (); /* HAVE_untyped_call required. */
valreg = gen_rtx_REG (mode, regno);
}
emit_call_insn (GEN_CALL_VALUE (valreg,
gen_rtx_MEM (FUNCTION_MODE, function),
const0_rtx, NULL_RTX, const0_rtx));
emit_move_insn (adjust_address (result, GET_MODE (valreg), 0), valreg);
}
else
#endif
abort ();
/* Find the CALL insn we just emitted. */
for (call_insn = get_last_insn ();
call_insn && GET_CODE (call_insn) != CALL_INSN;
call_insn = PREV_INSN (call_insn))
;
if (! call_insn)
abort ();
/* Put the register usage information on the CALL. If there is already
some usage information, put ours at the end. */
if (CALL_INSN_FUNCTION_USAGE (call_insn))
{
rtx link;
for (link = CALL_INSN_FUNCTION_USAGE (call_insn); XEXP (link, 1) != 0;
link = XEXP (link, 1))
;
XEXP (link, 1) = call_fusage;
}
else
CALL_INSN_FUNCTION_USAGE (call_insn) = call_fusage;
/* Restore the stack. */
#ifdef HAVE_save_stack_nonlocal
if (HAVE_save_stack_nonlocal)
emit_stack_restore (SAVE_NONLOCAL, old_stack_level, NULL_RTX);
else
#endif
emit_stack_restore (SAVE_BLOCK, old_stack_level, NULL_RTX);
OK_DEFER_POP;
/* Return the address of the result block. */
result = copy_addr_to_reg (XEXP (result, 0));
#ifdef POINTERS_EXTEND_UNSIGNED
if (GET_MODE (result) != ptr_mode)
result = convert_memory_address (ptr_mode, result);
#endif
return result;
}
/* Perform an untyped return. */
static void
expand_builtin_return (result)
rtx result;
{
int size, align, regno;
enum machine_mode mode;
rtx reg;
rtx call_fusage = 0;
#ifdef POINTERS_EXTEND_UNSIGNED
if (GET_MODE (result) != Pmode)
result = convert_memory_address (Pmode, result);
#endif
apply_result_size ();
result = gen_rtx_MEM (BLKmode, result);
#ifdef HAVE_untyped_return
if (HAVE_untyped_return)
{
emit_jump_insn (gen_untyped_return (result, result_vector (0, result)));
emit_barrier ();
return;
}
#endif
/* Restore the return value and note that each value is used. */
size = 0;
for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
if ((mode = apply_result_mode[regno]) != VOIDmode)
{
align = GET_MODE_ALIGNMENT (mode) / BITS_PER_UNIT;
if (size % align != 0)
size = CEIL (size, align) * align;
reg = gen_rtx_REG (mode, INCOMING_REGNO (regno));
emit_move_insn (reg, adjust_address (result, mode, size));
push_to_sequence (call_fusage);
emit_insn (gen_rtx_USE (VOIDmode, reg));
call_fusage = get_insns ();
end_sequence ();
size += GET_MODE_SIZE (mode);
}
/* Put the USE insns before the return. */
emit_insn (call_fusage);
/* Return whatever values was restored by jumping directly to the end
of the function. */
expand_null_return ();
}
/* Used by expand_builtin_classify_type and fold_builtin_classify_type. */
static enum type_class
type_to_class (type)
tree type;
{
switch (TREE_CODE (type))
{
case VOID_TYPE: return void_type_class;
case INTEGER_TYPE: return integer_type_class;
case CHAR_TYPE: return char_type_class;
case ENUMERAL_TYPE: return enumeral_type_class;
case BOOLEAN_TYPE: return boolean_type_class;
case POINTER_TYPE: return pointer_type_class;
case REFERENCE_TYPE: return reference_type_class;
case OFFSET_TYPE: return offset_type_class;
case REAL_TYPE: return real_type_class;
case COMPLEX_TYPE: return complex_type_class;
case FUNCTION_TYPE: return function_type_class;
case METHOD_TYPE: return method_type_class;
case RECORD_TYPE: return record_type_class;
case UNION_TYPE:
case QUAL_UNION_TYPE: return union_type_class;
case ARRAY_TYPE: return (TYPE_STRING_FLAG (type)
? string_type_class : array_type_class);
case SET_TYPE: return set_type_class;
case FILE_TYPE: return file_type_class;
case LANG_TYPE: return lang_type_class;
default: return no_type_class;
}
}
/* Expand a call to __builtin_classify_type with arguments found in
ARGLIST. */
static rtx
expand_builtin_classify_type (arglist)
tree arglist;
{
if (arglist != 0)
return GEN_INT (type_to_class (TREE_TYPE (TREE_VALUE (arglist))));
return GEN_INT (no_type_class);
}
/* Expand expression EXP, which is a call to __builtin_constant_p. */
static rtx
expand_builtin_constant_p (exp)
tree exp;
{
tree arglist = TREE_OPERAND (exp, 1);
enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
rtx tmp;
if (arglist == 0)
return const0_rtx;
arglist = TREE_VALUE (arglist);
/* We have taken care of the easy cases during constant folding. This
case is not obvious, so emit (constant_p_rtx (ARGLIST)) and let CSE get a
chance to see if it can deduce whether ARGLIST is constant. */
tmp = expand_expr (arglist, NULL_RTX, VOIDmode, 0);
tmp = gen_rtx_CONSTANT_P_RTX (value_mode, tmp);
return tmp;
}
/* Expand a call to one of the builtin math functions (sin, cos, or sqrt).
Return 0 if a normal call should be emitted rather than expanding the
function in-line. EXP is the expression that is a call to the builtin
function; if convenient, the result should be placed in TARGET.
SUBTARGET may be used as the target for computing one of EXP's operands. */
static rtx
expand_builtin_mathfn (exp, target, subtarget)
tree exp;
rtx target, subtarget;
{
optab builtin_optab;
rtx op0, insns;
tree fndecl = TREE_OPERAND (TREE_OPERAND (exp, 0), 0);
tree arglist = TREE_OPERAND (exp, 1);
enum machine_mode argmode;
if (!validate_arglist (arglist, REAL_TYPE, VOID_TYPE))
return 0;
/* Stabilize and compute the argument. */
if (TREE_CODE (TREE_VALUE (arglist)) != VAR_DECL
&& TREE_CODE (TREE_VALUE (arglist)) != PARM_DECL)
{
exp = copy_node (exp);
TREE_OPERAND (exp, 1) = arglist;
/* Wrap the computation of the argument in a SAVE_EXPR. That
way, if we need to expand the argument again (as in the
flag_errno_math case below where we cannot directly set
errno), we will not perform side-effects more than once.
Note that here we're mutating the original EXP as well as the
copy; that's the right thing to do in case the original EXP
is expanded later. */
TREE_VALUE (arglist) = save_expr (TREE_VALUE (arglist));
arglist = copy_node (arglist);
}
op0 = expand_expr (TREE_VALUE (arglist), subtarget, VOIDmode, 0);
/* Make a suitable register to place result in. */
target = gen_reg_rtx (TYPE_MODE (TREE_TYPE (exp)));
emit_queue ();
start_sequence ();
switch (DECL_FUNCTION_CODE (fndecl))
{
case BUILT_IN_SIN:
case BUILT_IN_SINF:
case BUILT_IN_SINL:
builtin_optab = sin_optab; break;
case BUILT_IN_COS:
case BUILT_IN_COSF:
case BUILT_IN_COSL:
builtin_optab = cos_optab; break;
case BUILT_IN_SQRT:
case BUILT_IN_SQRTF:
case BUILT_IN_SQRTL:
builtin_optab = sqrt_optab; break;
case BUILT_IN_EXP:
case BUILT_IN_EXPF:
case BUILT_IN_EXPL:
builtin_optab = exp_optab; break;
case BUILT_IN_LOG:
case BUILT_IN_LOGF:
case BUILT_IN_LOGL:
builtin_optab = log_optab; break;
default:
abort ();
}
/* Compute into TARGET.
Set TARGET to wherever the result comes back. */
argmode = TYPE_MODE (TREE_TYPE (TREE_VALUE (arglist)));
target = expand_unop (argmode, builtin_optab, op0, target, 0);
/* If we were unable to expand via the builtin, stop the
sequence (without outputting the insns) and return 0, causing
a call to the library function. */
if (target == 0)
{
end_sequence ();
return 0;
}
/* If errno must be maintained, we must set it to EDOM for NaN results. */
if (flag_errno_math && HONOR_NANS (argmode))
{
rtx lab1;
lab1 = gen_label_rtx ();
/* Test the result; if it is NaN, set errno=EDOM because
the argument was not in the domain. */
emit_cmp_and_jump_insns (target, target, EQ, 0, GET_MODE (target),
0, lab1);
#ifdef TARGET_EDOM
{
#ifdef GEN_ERRNO_RTX
rtx errno_rtx = GEN_ERRNO_RTX;
#else
rtx errno_rtx
= gen_rtx_MEM (word_mode, gen_rtx_SYMBOL_REF (Pmode, "errno"));
#endif
emit_move_insn (errno_rtx, GEN_INT (TARGET_EDOM));
}
#else
/* We can't set errno=EDOM directly; let the library call do it.
Pop the arguments right away in case the call gets deleted. */
NO_DEFER_POP;
expand_call (exp, target, 0);
OK_DEFER_POP;
#endif
emit_label (lab1);
}
/* Output the entire sequence. */
insns = get_insns ();
end_sequence ();
emit_insn (insns);
return target;
}
/* Expand expression EXP which is a call to the strlen builtin. Return 0
if we failed the caller should emit a normal call, otherwise
try to get the result in TARGET, if convenient. */
static rtx
expand_builtin_strlen (exp, target)
tree exp;
rtx target;
{
tree arglist = TREE_OPERAND (exp, 1);
enum machine_mode value_mode = TYPE_MODE (TREE_TYPE (exp));
if (!validate_arglist (arglist, POINTER_TYPE, VOID_TYPE))
return 0;
else
{
rtx pat;
tree src = TREE_VALUE (arglist);
int align
= get_pointer_alignment (src, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
rtx result, src_reg, char_rtx, before_strlen;
enum machine_mode insn_mode = value_mode, char_mode;
enum insn_code icode = CODE_FOR_nothing;
/* If SRC is not a pointer type, don't do this operation inline. */
if (align == 0)
return 0;
/* Bail out if we can't compute strlen in the right mode. */
while (insn_mode != VOIDmode)
{
icode = strlen_optab->handlers[(int) insn_mode].insn_code;
if (icode != CODE_FOR_nothing)
break;
insn_mode = GET_MODE_WIDER_MODE (insn_mode);
}
if (insn_mode == VOIDmode)
return 0;
/* Make a place to write the result of the instruction. */
result = target;
if (! (result != 0
&& GET_CODE (result) == REG
&& GET_MODE (result) == insn_mode
&& REGNO (result) >= FIRST_PSEUDO_REGISTER))
result = gen_reg_rtx (insn_mode);
/* Make a place to hold the source address. We will not expand
the actual source until we are sure that the expansion will
not fail -- there are trees that cannot be expanded twice. */
src_reg = gen_reg_rtx (Pmode);
/* Mark the beginning of the strlen sequence so we can emit the
source operand later. */
before_strlen = get_last_insn ();
char_rtx = const0_rtx;
char_mode = insn_data[(int) icode].operand[2].mode;
if (! (*insn_data[(int) icode].operand[2].predicate) (char_rtx,
char_mode))
char_rtx = copy_to_mode_reg (char_mode, char_rtx);
pat = GEN_FCN (icode) (result, gen_rtx_MEM (BLKmode, src_reg),
char_rtx, GEN_INT (align));
if (! pat)
return 0;
emit_insn (pat);
/* Now that we are assured of success, expand the source. */
start_sequence ();
pat = memory_address (BLKmode,
expand_expr (src, src_reg, ptr_mode, EXPAND_SUM));
if (pat != src_reg)
emit_move_insn (src_reg, pat);
pat = get_insns ();
end_sequence ();
if (before_strlen)
emit_insn_after (pat, before_strlen);
else
emit_insn_before (pat, get_insns ());
/* Return the value in the proper mode for this function. */
if (GET_MODE (result) == value_mode)
target = result;
else if (target != 0)
convert_move (target, result, 0);
else
target = convert_to_mode (value_mode, result, 0);
return target;
}
}
/* Expand a call to the strstr builtin. Return 0 if we failed the
caller should emit a normal call, otherwise try to get the result
in TARGET, if convenient (and in mode MODE if that's convenient). */
static rtx
expand_builtin_strstr (arglist, target, mode)
tree arglist;
rtx target;
enum machine_mode mode;
{
if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
return 0;
else
{
tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
tree fn;
const char *p1, *p2;
p2 = c_getstr (s2);
if (p2 == NULL)
return 0;
p1 = c_getstr (s1);
if (p1 != NULL)
{
const char *r = strstr (p1, p2);
if (r == NULL)
return const0_rtx;
/* Return an offset into the constant string argument. */
return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
s1, ssize_int (r - p1))),
target, mode, EXPAND_NORMAL);
}
if (p2[0] == '\0')
return expand_expr (s1, target, mode, EXPAND_NORMAL);
if (p2[1] != '\0')
return 0;
fn = built_in_decls[BUILT_IN_STRCHR];
if (!fn)
return 0;
/* New argument list transforming strstr(s1, s2) to
strchr(s1, s2[0]). */
arglist =
build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
arglist = tree_cons (NULL_TREE, s1, arglist);
return expand_expr (build_function_call_expr (fn, arglist),
target, mode, EXPAND_NORMAL);
}
}
/* Expand a call to the strchr builtin. Return 0 if we failed the
caller should emit a normal call, otherwise try to get the result
in TARGET, if convenient (and in mode MODE if that's convenient). */
static rtx
expand_builtin_strchr (arglist, target, mode)
tree arglist;
rtx target;
enum machine_mode mode;
{
if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
return 0;
else
{
tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
const char *p1;
if (TREE_CODE (s2) != INTEGER_CST)
return 0;
p1 = c_getstr (s1);
if (p1 != NULL)
{
char c;
const char *r;
if (target_char_cast (s2, &c))
return 0;
r = strchr (p1, c);
if (r == NULL)
return const0_rtx;
/* Return an offset into the constant string argument. */
return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
s1, ssize_int (r - p1))),
target, mode, EXPAND_NORMAL);
}
/* FIXME: Should use here strchrM optab so that ports can optimize
this. */
return 0;
}
}
/* Expand a call to the strrchr builtin. Return 0 if we failed the
caller should emit a normal call, otherwise try to get the result
in TARGET, if convenient (and in mode MODE if that's convenient). */
static rtx
expand_builtin_strrchr (arglist, target, mode)
tree arglist;
rtx target;
enum machine_mode mode;
{
if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
return 0;
else
{
tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
tree fn;
const char *p1;
if (TREE_CODE (s2) != INTEGER_CST)
return 0;
p1 = c_getstr (s1);
if (p1 != NULL)
{
char c;
const char *r;
if (target_char_cast (s2, &c))
return 0;
r = strrchr (p1, c);
if (r == NULL)
return const0_rtx;
/* Return an offset into the constant string argument. */
return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
s1, ssize_int (r - p1))),
target, mode, EXPAND_NORMAL);
}
if (! integer_zerop (s2))
return 0;
fn = built_in_decls[BUILT_IN_STRCHR];
if (!fn)
return 0;
/* Transform strrchr(s1, '\0') to strchr(s1, '\0'). */
return expand_expr (build_function_call_expr (fn, arglist),
target, mode, EXPAND_NORMAL);
}
}
/* Expand a call to the strpbrk builtin. Return 0 if we failed the
caller should emit a normal call, otherwise try to get the result
in TARGET, if convenient (and in mode MODE if that's convenient). */
static rtx
expand_builtin_strpbrk (arglist, target, mode)
tree arglist;
rtx target;
enum machine_mode mode;
{
if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
return 0;
else
{
tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
tree fn;
const char *p1, *p2;
p2 = c_getstr (s2);
if (p2 == NULL)
return 0;
p1 = c_getstr (s1);
if (p1 != NULL)
{
const char *r = strpbrk (p1, p2);
if (r == NULL)
return const0_rtx;
/* Return an offset into the constant string argument. */
return expand_expr (fold (build (PLUS_EXPR, TREE_TYPE (s1),
s1, ssize_int (r - p1))),
target, mode, EXPAND_NORMAL);
}
if (p2[0] == '\0')
{
/* strpbrk(x, "") == NULL.
Evaluate and ignore the arguments in case they had
side-effects. */
expand_expr (s1, const0_rtx, VOIDmode, EXPAND_NORMAL);
return const0_rtx;
}
if (p2[1] != '\0')
return 0; /* Really call strpbrk. */
fn = built_in_decls[BUILT_IN_STRCHR];
if (!fn)
return 0;
/* New argument list transforming strpbrk(s1, s2) to
strchr(s1, s2[0]). */
arglist =
build_tree_list (NULL_TREE, build_int_2 (p2[0], 0));
arglist = tree_cons (NULL_TREE, s1, arglist);
return expand_expr (build_function_call_expr (fn, arglist),
target, mode, EXPAND_NORMAL);
}
}
/* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
bytes from constant string DATA + OFFSET and return it as target
constant. */
static rtx
builtin_memcpy_read_str (data, offset, mode)
PTR data;
HOST_WIDE_INT offset;
enum machine_mode mode;
{
const char *str = (const char *) data;
if (offset < 0
|| ((unsigned HOST_WIDE_INT) offset + GET_MODE_SIZE (mode)
> strlen (str) + 1))
abort (); /* Attempt to read past the end of constant string. */
return c_readstr (str + offset, mode);
}
/* Expand a call to the memcpy builtin, with arguments in ARGLIST.
Return 0 if we failed, the caller should emit a normal call, otherwise
try to get the result in TARGET, if convenient (and in mode MODE if
that's convenient). */
static rtx
expand_builtin_memcpy (arglist, target, mode)
tree arglist;
rtx target;
enum machine_mode mode;
{
if (!validate_arglist (arglist,
POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
return 0;
else
{
tree dest = TREE_VALUE (arglist);
tree src = TREE_VALUE (TREE_CHAIN (arglist));
tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
const char *src_str;
unsigned int src_align = get_pointer_alignment (src, BIGGEST_ALIGNMENT);
unsigned int dest_align
= get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
rtx dest_mem, src_mem, dest_addr, len_rtx;
/* If DEST is not a pointer type, call the normal function. */
if (dest_align == 0)
return 0;
/* If the LEN parameter is zero, return DEST. */
if (host_integerp (len, 1) && tree_low_cst (len, 1) == 0)
{
/* Evaluate and ignore SRC in case it has side-effects. */
expand_expr (src, const0_rtx, VOIDmode, EXPAND_NORMAL);
return expand_expr (dest, target, mode, EXPAND_NORMAL);
}
/* If either SRC is not a pointer type, don't do this
operation in-line. */
if (src_align == 0)
return 0;
dest_mem = get_memory_rtx (dest);
set_mem_align (dest_mem, dest_align);
len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
src_str = c_getstr (src);
/* If SRC is a string constant and block move would be done
by pieces, we can avoid loading the string from memory
and only stored the computed constants. */
if (src_str
&& GET_CODE (len_rtx) == CONST_INT
&& (unsigned HOST_WIDE_INT) INTVAL (len_rtx) <= strlen (src_str) + 1
&& can_store_by_pieces (INTVAL (len_rtx), builtin_memcpy_read_str,
(PTR) src_str, dest_align))
{
store_by_pieces (dest_mem, INTVAL (len_rtx),
builtin_memcpy_read_str,
(PTR) src_str, dest_align);
dest_mem = force_operand (XEXP (dest_mem, 0), NULL_RTX);
#ifdef POINTERS_EXTEND_UNSIGNED
if (GET_MODE (dest_mem) != ptr_mode)
dest_mem = convert_memory_address (ptr_mode, dest_mem);
#endif
return dest_mem;
}
src_mem = get_memory_rtx (src);
set_mem_align (src_mem, src_align);
/* Copy word part most expediently. */
dest_addr = emit_block_move (dest_mem, src_mem, len_rtx,
BLOCK_OP_NORMAL);
if (dest_addr == 0)
{
dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
#ifdef POINTERS_EXTEND_UNSIGNED
if (GET_MODE (dest_addr) != ptr_mode)
dest_addr = convert_memory_address (ptr_mode, dest_addr);
#endif
}
return dest_addr;
}
}
/* Expand expression EXP, which is a call to the strcpy builtin. Return 0
if we failed the caller should emit a normal call, otherwise try to get
the result in TARGET, if convenient (and in mode MODE if that's
convenient). */
static rtx
expand_builtin_strcpy (exp, target, mode)
tree exp;
rtx target;
enum machine_mode mode;
{
tree arglist = TREE_OPERAND (exp, 1);
tree fn, len, src, dst;
if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
return 0;
fn = built_in_decls[BUILT_IN_MEMCPY];
if (!fn)
return 0;
src = TREE_VALUE (TREE_CHAIN (arglist));
len = c_strlen (src);
if (len == 0 || TREE_SIDE_EFFECTS (len))
return 0;
dst = TREE_VALUE (arglist);
len = size_binop (PLUS_EXPR, len, ssize_int (1));
arglist = build_tree_list (NULL_TREE, len);
arglist = tree_cons (NULL_TREE, src, arglist);
arglist = tree_cons (NULL_TREE, dst, arglist);
return expand_expr (build_function_call_expr (fn, arglist),
target, mode, EXPAND_NORMAL);
}
/* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
bytes from constant string DATA + OFFSET and return it as target
constant. */
static rtx
builtin_strncpy_read_str (data, offset, mode)
PTR data;
HOST_WIDE_INT offset;
enum machine_mode mode;
{
const char *str = (const char *) data;
if ((unsigned HOST_WIDE_INT) offset > strlen (str))
return const0_rtx;
return c_readstr (str + offset, mode);
}
/* Expand expression EXP, which is a call to the strncpy builtin. Return 0
if we failed the caller should emit a normal call. */
static rtx
expand_builtin_strncpy (arglist, target, mode)
tree arglist;
rtx target;
enum machine_mode mode;
{
if (!validate_arglist (arglist,
POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
return 0;
else
{
tree slen = c_strlen (TREE_VALUE (TREE_CHAIN (arglist)));
tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
tree fn;
/* We must be passed a constant len parameter. */
if (TREE_CODE (len) != INTEGER_CST)
return 0;
/* If the len parameter is zero, return the dst parameter. */
if (integer_zerop (len))
{
/* Evaluate and ignore the src argument in case it has
side-effects. */
expand_expr (TREE_VALUE (TREE_CHAIN (arglist)), const0_rtx,
VOIDmode, EXPAND_NORMAL);
/* Return the dst parameter. */
return expand_expr (TREE_VALUE (arglist), target, mode,
EXPAND_NORMAL);
}
/* Now, we must be passed a constant src ptr parameter. */
if (slen == 0 || TREE_CODE (slen) != INTEGER_CST)
return 0;
slen = size_binop (PLUS_EXPR, slen, ssize_int (1));
/* We're required to pad with trailing zeros if the requested
len is greater than strlen(s2)+1. In that case try to
use store_by_pieces, if it fails, punt. */
if (tree_int_cst_lt (slen, len))
{
tree dest = TREE_VALUE (arglist);
unsigned int dest_align
= get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
const char *p = c_getstr (TREE_VALUE (TREE_CHAIN (arglist)));
rtx dest_mem;
if (!p || dest_align == 0 || !host_integerp (len, 1)
|| !can_store_by_pieces (tree_low_cst (len, 1),
builtin_strncpy_read_str,
(PTR) p, dest_align))
return 0;
dest_mem = get_memory_rtx (dest);
store_by_pieces (dest_mem, tree_low_cst (len, 1),
builtin_strncpy_read_str,
(PTR) p, dest_align);
dest_mem = force_operand (XEXP (dest_mem, 0), NULL_RTX);
#ifdef POINTERS_EXTEND_UNSIGNED
if (GET_MODE (dest_mem) != ptr_mode)
dest_mem = convert_memory_address (ptr_mode, dest_mem);
#endif
return dest_mem;
}
/* OK transform into builtin memcpy. */
fn = built_in_decls[BUILT_IN_MEMCPY];
if (!fn)
return 0;
return expand_expr (build_function_call_expr (fn, arglist),
target, mode, EXPAND_NORMAL);
}
}
/* Callback routine for store_by_pieces. Read GET_MODE_BITSIZE (MODE)
bytes from constant string DATA + OFFSET and return it as target
constant. */
static rtx
builtin_memset_read_str (data, offset, mode)
PTR data;
HOST_WIDE_INT offset ATTRIBUTE_UNUSED;
enum machine_mode mode;
{
const char *c = (const char *) data;
char *p = alloca (GET_MODE_SIZE (mode));
memset (p, *c, GET_MODE_SIZE (mode));
return c_readstr (p, mode);
}
/* Callback routine for store_by_pieces. Return the RTL of a register
containing GET_MODE_SIZE (MODE) consecutive copies of the unsigned
char value given in the RTL register data. For example, if mode is
4 bytes wide, return the RTL for 0x01010101*data. */
static rtx
builtin_memset_gen_str (data, offset, mode)
PTR data;
HOST_WIDE_INT offset ATTRIBUTE_UNUSED;
enum machine_mode mode;
{
rtx target, coeff;
size_t size;
char *p;
size = GET_MODE_SIZE (mode);
if (size == 1)
return (rtx) data;
p = alloca (size);
memset (p, 1, size);
coeff = c_readstr (p, mode);
target = convert_to_mode (mode, (rtx) data, 1);
target = expand_mult (mode, target, coeff, NULL_RTX, 1);
return force_reg (mode, target);
}
/* Expand expression EXP, which is a call to the memset builtin. Return 0
if we failed the caller should emit a normal call, otherwise try to get
the result in TARGET, if convenient (and in mode MODE if that's
convenient). */
static rtx
expand_builtin_memset (exp, target, mode)
tree exp;
rtx target;
enum machine_mode mode;
{
tree arglist = TREE_OPERAND (exp, 1);
if (!validate_arglist (arglist,
POINTER_TYPE, INTEGER_TYPE, INTEGER_TYPE, VOID_TYPE))
return 0;
else
{
tree dest = TREE_VALUE (arglist);
tree val = TREE_VALUE (TREE_CHAIN (arglist));
tree len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
char c;
unsigned int dest_align
= get_pointer_alignment (dest, BIGGEST_ALIGNMENT);
rtx dest_mem, dest_addr, len_rtx;
/* If DEST is not a pointer type, don't do this
operation in-line. */
if (dest_align == 0)
return 0;
/* If the LEN parameter is zero, return DEST. */
if (host_integerp (len, 1) && tree_low_cst (len, 1) == 0)
{
/* Evaluate and ignore VAL in case it has side-effects. */
expand_expr (val, const0_rtx, VOIDmode, EXPAND_NORMAL);
return expand_expr (dest, target, mode, EXPAND_NORMAL);
}
if (TREE_CODE (val) != INTEGER_CST)
{
rtx val_rtx;
if (!host_integerp (len, 1))
return 0;
if (optimize_size && tree_low_cst (len, 1) > 1)
return 0;
/* Assume that we can memset by pieces if we can store the
* the coefficients by pieces (in the required modes).
* We can't pass builtin_memset_gen_str as that emits RTL. */
c = 1;
if (!can_store_by_pieces (tree_low_cst (len, 1),
builtin_memset_read_str,
(PTR) &c, dest_align))
return 0;
val = fold (build1 (CONVERT_EXPR, unsigned_char_type_node, val));
val_rtx = expand_expr (val, NULL_RTX, VOIDmode, 0);
val_rtx = force_reg (TYPE_MODE (unsigned_char_type_node),
val_rtx);
dest_mem = get_memory_rtx (dest);
store_by_pieces (dest_mem, tree_low_cst (len, 1),
builtin_memset_gen_str,
(PTR) val_rtx, dest_align);
dest_mem = force_operand (XEXP (dest_mem, 0), NULL_RTX);
#ifdef POINTERS_EXTEND_UNSIGNED
if (GET_MODE (dest_mem) != ptr_mode)
dest_mem = convert_memory_address (ptr_mode, dest_mem);
#endif
return dest_mem;
}
if (target_char_cast (val, &c))
return 0;
if (c)
{
if (!host_integerp (len, 1))
return 0;
if (!can_store_by_pieces (tree_low_cst (len, 1),
builtin_memset_read_str, (PTR) &c,
dest_align))
return 0;
dest_mem = get_memory_rtx (dest);
store_by_pieces (dest_mem, tree_low_cst (len, 1),
builtin_memset_read_str,
(PTR) &c, dest_align);
dest_mem = force_operand (XEXP (dest_mem, 0), NULL_RTX);
#ifdef POINTERS_EXTEND_UNSIGNED
if (GET_MODE (dest_mem) != ptr_mode)
dest_mem = convert_memory_address (ptr_mode, dest_mem);
#endif
return dest_mem;
}
len_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
dest_mem = get_memory_rtx (dest);
set_mem_align (dest_mem, dest_align);
dest_addr = clear_storage (dest_mem, len_rtx);
if (dest_addr == 0)
{
dest_addr = force_operand (XEXP (dest_mem, 0), NULL_RTX);
#ifdef POINTERS_EXTEND_UNSIGNED
if (GET_MODE (dest_addr) != ptr_mode)
dest_addr = convert_memory_address (ptr_mode, dest_addr);
#endif
}
return dest_addr;
}
}
/* Expand expression EXP, which is a call to the bzero builtin. Return 0
if we failed the caller should emit a normal call. */
static rtx
expand_builtin_bzero (exp)
tree exp;
{
tree arglist = TREE_OPERAND (exp, 1);
tree dest, size, newarglist;
rtx result;
if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
return NULL_RTX;
dest = TREE_VALUE (arglist);
size = TREE_VALUE (TREE_CHAIN (arglist));
/* New argument list transforming bzero(ptr x, int y) to
memset(ptr x, int 0, size_t y). This is done this way
so that if it isn't expanded inline, we fallback to
calling bzero instead of memset. */
newarglist = build_tree_list (NULL_TREE, convert (sizetype, size));
newarglist = tree_cons (NULL_TREE, integer_zero_node, newarglist);
newarglist = tree_cons (NULL_TREE, dest, newarglist);
TREE_OPERAND (exp, 1) = newarglist;
result = expand_builtin_memset (exp, const0_rtx, VOIDmode);
/* Always restore the original arguments. */
TREE_OPERAND (exp, 1) = arglist;
return result;
}
/* Expand expression EXP, which is a call to the memcmp built-in function.
ARGLIST is the argument list for this call. Return 0 if we failed and the
caller should emit a normal call, otherwise try to get the result in
TARGET, if convenient (and in mode MODE, if that's convenient). */
static rtx
expand_builtin_memcmp (exp, arglist, target, mode)
tree exp ATTRIBUTE_UNUSED;
tree arglist;
rtx target;
enum machine_mode mode;
{
tree arg1, arg2, len;
const char *p1, *p2;
if (!validate_arglist (arglist,
POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
return 0;
arg1 = TREE_VALUE (arglist);
arg2 = TREE_VALUE (TREE_CHAIN (arglist));
len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
/* If the len parameter is zero, return zero. */
if (host_integerp (len, 1) && tree_low_cst (len, 1) == 0)
{
/* Evaluate and ignore arg1 and arg2 in case they have
side-effects. */
expand_expr (arg1, const0_rtx, VOIDmode, EXPAND_NORMAL);
expand_expr (arg2, const0_rtx, VOIDmode, EXPAND_NORMAL);
return const0_rtx;
}
p1 = c_getstr (arg1);
p2 = c_getstr (arg2);
/* If all arguments are constant, and the value of len is not greater
than the lengths of arg1 and arg2, evaluate at compile-time. */
if (host_integerp (len, 1) && p1 && p2
&& compare_tree_int (len, strlen (p1) + 1) <= 0
&& compare_tree_int (len, strlen (p2) + 1) <= 0)
{
const int r = memcmp (p1, p2, tree_low_cst (len, 1));
return (r < 0 ? constm1_rtx : (r > 0 ? const1_rtx : const0_rtx));
}
/* If len parameter is one, return an expression corresponding to
(*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
if (host_integerp (len, 1) && tree_low_cst (len, 1) == 1)
{
tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
tree ind1 =
fold (build1 (CONVERT_EXPR, integer_type_node,
build1 (INDIRECT_REF, cst_uchar_node,
build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
tree ind2 =
fold (build1 (CONVERT_EXPR, integer_type_node,
build1 (INDIRECT_REF, cst_uchar_node,
build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
return expand_expr (result, target, mode, EXPAND_NORMAL);
}
#ifdef HAVE_cmpstrsi
{
rtx arg1_rtx, arg2_rtx, arg3_rtx;
rtx result;
rtx insn;
int arg1_align
= get_pointer_alignment (arg1, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
int arg2_align
= get_pointer_alignment (arg2, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
enum machine_mode insn_mode
= insn_data[(int) CODE_FOR_cmpstrsi].operand[0].mode;
/* If we don't have POINTER_TYPE, call the function. */
if (arg1_align == 0 || arg2_align == 0)
return 0;
/* Make a place to write the result of the instruction. */
result = target;
if (! (result != 0
&& GET_CODE (result) == REG && GET_MODE (result) == insn_mode
&& REGNO (result) >= FIRST_PSEUDO_REGISTER))
result = gen_reg_rtx (insn_mode);
arg1_rtx = get_memory_rtx (arg1);
arg2_rtx = get_memory_rtx (arg2);
arg3_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
if (!HAVE_cmpstrsi)
insn = NULL_RTX;
else
insn = gen_cmpstrsi (result, arg1_rtx, arg2_rtx, arg3_rtx,
GEN_INT (MIN (arg1_align, arg2_align)));
if (insn)
emit_insn (insn);
else
emit_library_call_value (memcmp_libfunc, result, LCT_PURE_MAKE_BLOCK,
TYPE_MODE (integer_type_node), 3,
XEXP (arg1_rtx, 0), Pmode,
XEXP (arg2_rtx, 0), Pmode,
convert_to_mode (TYPE_MODE (sizetype), arg3_rtx,
TREE_UNSIGNED (sizetype)),
TYPE_MODE (sizetype));
/* Return the value in the proper mode for this function. */
mode = TYPE_MODE (TREE_TYPE (exp));
if (GET_MODE (result) == mode)
return result;
else if (target != 0)
{
convert_move (target, result, 0);
return target;
}
else
return convert_to_mode (mode, result, 0);
}
#endif
return 0;
}
/* Expand expression EXP, which is a call to the strcmp builtin. Return 0
if we failed the caller should emit a normal call, otherwise try to get
the result in TARGET, if convenient. */
static rtx
expand_builtin_strcmp (exp, target, mode)
tree exp;
rtx target;
enum machine_mode mode;
{
tree arglist = TREE_OPERAND (exp, 1);
tree arg1, arg2;
const char *p1, *p2;
if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
return 0;
arg1 = TREE_VALUE (arglist);
arg2 = TREE_VALUE (TREE_CHAIN (arglist));
p1 = c_getstr (arg1);
p2 = c_getstr (arg2);
if (p1 && p2)
{
const int i = strcmp (p1, p2);
return (i < 0 ? constm1_rtx : (i > 0 ? const1_rtx : const0_rtx));
}
/* If either arg is "", return an expression corresponding to
(*(const unsigned char*)arg1 - (const unsigned char*)arg2). */
if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
{
tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
tree ind1 =
fold (build1 (CONVERT_EXPR, integer_type_node,
build1 (INDIRECT_REF, cst_uchar_node,
build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
tree ind2 =
fold (build1 (CONVERT_EXPR, integer_type_node,
build1 (INDIRECT_REF, cst_uchar_node,
build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
return expand_expr (result, target, mode, EXPAND_NORMAL);
}
#ifdef HAVE_cmpstrsi
if (HAVE_cmpstrsi)
{
tree len, len1, len2;
rtx arg1_rtx, arg2_rtx, arg3_rtx;
rtx result, insn;
int arg1_align
= get_pointer_alignment (arg1, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
int arg2_align
= get_pointer_alignment (arg2, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
enum machine_mode insn_mode
= insn_data[(int) CODE_FOR_cmpstrsi].operand[0].mode;
len1 = c_strlen (arg1);
len2 = c_strlen (arg2);
if (len1)
len1 = size_binop (PLUS_EXPR, ssize_int (1), len1);
if (len2)
len2 = size_binop (PLUS_EXPR, ssize_int (1), len2);
/* If we don't have a constant length for the first, use the length
of the second, if we know it. We don't require a constant for
this case; some cost analysis could be done if both are available
but neither is constant. For now, assume they're equally cheap
unless one has side effects. If both strings have constant lengths,
use the smaller. */
if (!len1)
len = len2;
else if (!len2)
len = len1;
else if (TREE_SIDE_EFFECTS (len1))
len = len2;
else if (TREE_SIDE_EFFECTS (len2))
len = len1;
else if (TREE_CODE (len1) != INTEGER_CST)
len = len2;
else if (TREE_CODE (len2) != INTEGER_CST)
len = len1;
else if (tree_int_cst_lt (len1, len2))
len = len1;
else
len = len2;
/* If both arguments have side effects, we cannot optimize. */
if (!len || TREE_SIDE_EFFECTS (len))
return 0;
/* If we don't have POINTER_TYPE, call the function. */
if (arg1_align == 0 || arg2_align == 0)
return 0;
/* Make a place to write the result of the instruction. */
result = target;
if (! (result != 0
&& GET_CODE (result) == REG
&& GET_MODE (result) == insn_mode
&& REGNO (result) >= FIRST_PSEUDO_REGISTER))
result = gen_reg_rtx (insn_mode);
arg1_rtx = get_memory_rtx (arg1);
arg2_rtx = get_memory_rtx (arg2);
arg3_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
insn = gen_cmpstrsi (result, arg1_rtx, arg2_rtx, arg3_rtx,
GEN_INT (MIN (arg1_align, arg2_align)));
if (!insn)
return 0;
emit_insn (insn);
/* Return the value in the proper mode for this function. */
mode = TYPE_MODE (TREE_TYPE (exp));
if (GET_MODE (result) == mode)
return result;
if (target == 0)
return convert_to_mode (mode, result, 0);
convert_move (target, result, 0);
return target;
}
#endif
return 0;
}
/* Expand expression EXP, which is a call to the strncmp builtin. Return 0
if we failed the caller should emit a normal call, otherwise try to get
the result in TARGET, if convenient. */
static rtx
expand_builtin_strncmp (exp, target, mode)
tree exp;
rtx target;
enum machine_mode mode;
{
tree arglist = TREE_OPERAND (exp, 1);
tree arg1, arg2, arg3;
const char *p1, *p2;
if (!validate_arglist (arglist,
POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
return 0;
arg1 = TREE_VALUE (arglist);
arg2 = TREE_VALUE (TREE_CHAIN (arglist));
arg3 = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
/* If the len parameter is zero, return zero. */
if (host_integerp (arg3, 1) && tree_low_cst (arg3, 1) == 0)
{
/* Evaluate and ignore arg1 and arg2 in case they have
side-effects. */
expand_expr (arg1, const0_rtx, VOIDmode, EXPAND_NORMAL);
expand_expr (arg2, const0_rtx, VOIDmode, EXPAND_NORMAL);
return const0_rtx;
}
p1 = c_getstr (arg1);
p2 = c_getstr (arg2);
/* If all arguments are constant, evaluate at compile-time. */
if (host_integerp (arg3, 1) && p1 && p2)
{
const int r = strncmp (p1, p2, tree_low_cst (arg3, 1));
return (r < 0 ? constm1_rtx : (r > 0 ? const1_rtx : const0_rtx));
}
/* If len == 1 or (either string parameter is "" and (len >= 1)),
return (*(const u_char*)arg1 - *(const u_char*)arg2). */
if (host_integerp (arg3, 1)
&& (tree_low_cst (arg3, 1) == 1
|| (tree_low_cst (arg3, 1) > 1
&& ((p1 && *p1 == '\0') || (p2 && *p2 == '\0')))))
{
tree cst_uchar_node = build_type_variant (unsigned_char_type_node, 1, 0);
tree cst_uchar_ptr_node = build_pointer_type (cst_uchar_node);
tree ind1 =
fold (build1 (CONVERT_EXPR, integer_type_node,
build1 (INDIRECT_REF, cst_uchar_node,
build1 (NOP_EXPR, cst_uchar_ptr_node, arg1))));
tree ind2 =
fold (build1 (CONVERT_EXPR, integer_type_node,
build1 (INDIRECT_REF, cst_uchar_node,
build1 (NOP_EXPR, cst_uchar_ptr_node, arg2))));
tree result = fold (build (MINUS_EXPR, integer_type_node, ind1, ind2));
return expand_expr (result, target, mode, EXPAND_NORMAL);
}
/* If c_strlen can determine an expression for one of the string
lengths, and it doesn't have side effects, then emit cmpstrsi
using length MIN(strlen(string)+1, arg3). */
#ifdef HAVE_cmpstrsi
if (HAVE_cmpstrsi)
{
tree len, len1, len2;
rtx arg1_rtx, arg2_rtx, arg3_rtx;
rtx result, insn;
int arg1_align
= get_pointer_alignment (arg1, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
int arg2_align
= get_pointer_alignment (arg2, BIGGEST_ALIGNMENT) / BITS_PER_UNIT;
enum machine_mode insn_mode
= insn_data[(int) CODE_FOR_cmpstrsi].operand[0].mode;
len1 = c_strlen (arg1);
len2 = c_strlen (arg2);
if (len1)
len1 = size_binop (PLUS_EXPR, ssize_int (1), len1);
if (len2)
len2 = size_binop (PLUS_EXPR, ssize_int (1), len2);
/* If we don't have a constant length for the first, use the length
of the second, if we know it. We don't require a constant for
this case; some cost analysis could be done if both are available
but neither is constant. For now, assume they're equally cheap,
unless one has side effects. If both strings have constant lengths,
use the smaller. */
if (!len1)
len = len2;
else if (!len2)
len = len1;
else if (TREE_SIDE_EFFECTS (len1))
len = len2;
else if (TREE_SIDE_EFFECTS (len2))
len = len1;
else if (TREE_CODE (len1) != INTEGER_CST)
len = len2;
else if (TREE_CODE (len2) != INTEGER_CST)
len = len1;
else if (tree_int_cst_lt (len1, len2))
len = len1;
else
len = len2;
/* If both arguments have side effects, we cannot optimize. */
if (!len || TREE_SIDE_EFFECTS (len))
return 0;
/* The actual new length parameter is MIN(len,arg3). */
len = fold (build (MIN_EXPR, TREE_TYPE (len), len, arg3));
/* If we don't have POINTER_TYPE, call the function. */
if (arg1_align == 0 || arg2_align == 0)
return 0;
/* Make a place to write the result of the instruction. */
result = target;
if (! (result != 0
&& GET_CODE (result) == REG
&& GET_MODE (result) == insn_mode
&& REGNO (result) >= FIRST_PSEUDO_REGISTER))
result = gen_reg_rtx (insn_mode);
arg1_rtx = get_memory_rtx (arg1);
arg2_rtx = get_memory_rtx (arg2);
arg3_rtx = expand_expr (len, NULL_RTX, VOIDmode, 0);
insn = gen_cmpstrsi (result, arg1_rtx, arg2_rtx, arg3_rtx,
GEN_INT (MIN (arg1_align, arg2_align)));
if (!insn)
return 0;
emit_insn (insn);
/* Return the value in the proper mode for this function. */
mode = TYPE_MODE (TREE_TYPE (exp));
if (GET_MODE (result) == mode)
return result;
if (target == 0)
return convert_to_mode (mode, result, 0);
convert_move (target, result, 0);
return target;
}
#endif
return 0;
}
/* Expand expression EXP, which is a call to the strcat builtin.
Return 0 if we failed the caller should emit a normal call,
otherwise try to get the result in TARGET, if convenient. */
static rtx
expand_builtin_strcat (arglist, target, mode)
tree arglist;
rtx target;
enum machine_mode mode;
{
if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
return 0;
else
{
tree dst = TREE_VALUE (arglist),
src = TREE_VALUE (TREE_CHAIN (arglist));
const char *p = c_getstr (src);
/* If the string length is zero, return the dst parameter. */
if (p && *p == '\0')
return expand_expr (dst, target, mode, EXPAND_NORMAL);
return 0;
}
}
/* Expand expression EXP, which is a call to the strncat builtin.
Return 0 if we failed the caller should emit a normal call,
otherwise try to get the result in TARGET, if convenient. */
static rtx
expand_builtin_strncat (arglist, target, mode)
tree arglist;
rtx target;
enum machine_mode mode;
{
if (!validate_arglist (arglist,
POINTER_TYPE, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
return 0;
else
{
tree dst = TREE_VALUE (arglist),
src = TREE_VALUE (TREE_CHAIN (arglist)),
len = TREE_VALUE (TREE_CHAIN (TREE_CHAIN (arglist)));
const char *p = c_getstr (src);
/* If the requested length is zero, or the src parameter string
length is zero, return the dst parameter. */
if (integer_zerop (len) || (p && *p == '\0'))
{
/* Evaluate and ignore the src and len parameters in case
they have side-effects. */
expand_expr (src, const0_rtx, VOIDmode, EXPAND_NORMAL);
expand_expr (len, const0_rtx, VOIDmode, EXPAND_NORMAL);
return expand_expr (dst, target, mode, EXPAND_NORMAL);
}
/* If the requested len is greater than or equal to the string
length, call strcat. */
if (TREE_CODE (len) == INTEGER_CST && p
&& compare_tree_int (len, strlen (p)) >= 0)
{
tree newarglist
= tree_cons (NULL_TREE, dst, build_tree_list (NULL_TREE, src));
tree fn = built_in_decls[BUILT_IN_STRCAT];
/* If the replacement _DECL isn't initialized, don't do the
transformation. */
if (!fn)
return 0;
return expand_expr (build_function_call_expr (fn, newarglist),
target, mode, EXPAND_NORMAL);
}
return 0;
}
}
/* Expand expression EXP, which is a call to the strspn builtin.
Return 0 if we failed the caller should emit a normal call,
otherwise try to get the result in TARGET, if convenient. */
static rtx
expand_builtin_strspn (arglist, target, mode)
tree arglist;
rtx target;
enum machine_mode mode;
{
if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
return 0;
else
{
tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
/* If both arguments are constants, evaluate at compile-time. */
if (p1 && p2)
{
const size_t r = strspn (p1, p2);
return expand_expr (size_int (r), target, mode, EXPAND_NORMAL);
}
/* If either argument is "", return 0. */
if ((p1 && *p1 == '\0') || (p2 && *p2 == '\0'))
{
/* Evaluate and ignore both arguments in case either one has
side-effects. */
expand_expr (s1, const0_rtx, VOIDmode, EXPAND_NORMAL);
expand_expr (s2, const0_rtx, VOIDmode, EXPAND_NORMAL);
return const0_rtx;
}
return 0;
}
}
/* Expand expression EXP, which is a call to the strcspn builtin.
Return 0 if we failed the caller should emit a normal call,
otherwise try to get the result in TARGET, if convenient. */
static rtx
expand_builtin_strcspn (arglist, target, mode)
tree arglist;
rtx target;
enum machine_mode mode;
{
if (!validate_arglist (arglist, POINTER_TYPE, POINTER_TYPE, VOID_TYPE))
return 0;
else
{
tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
const char *p1 = c_getstr (s1), *p2 = c_getstr (s2);
/* If both arguments are constants, evaluate at compile-time. */
if (p1 && p2)
{
const size_t r = strcspn (p1, p2);
return expand_expr (size_int (r), target, mode, EXPAND_NORMAL);
}
/* If the first argument is "", return 0. */
if (p1 && *p1 == '\0')
{
/* Evaluate and ignore argument s2 in case it has
side-effects. */
expand_expr (s2, const0_rtx, VOIDmode, EXPAND_NORMAL);
return const0_rtx;
}
/* If the second argument is "", return __builtin_strlen(s1). */
if (p2 && *p2 == '\0')
{
tree newarglist = build_tree_list (NULL_TREE, s1),
fn = built_in_decls[BUILT_IN_STRLEN];
/* If the replacement _DECL isn't initialized, don't do the
transformation. */
if (!fn)
return 0;
return expand_expr (build_function_call_expr (fn, newarglist),
target, mode, EXPAND_NORMAL);
}
return 0;
}
}
/* Expand a call to __builtin_saveregs, generating the result in TARGET,
if that's convenient. */
rtx
expand_builtin_saveregs ()
{
rtx val, seq;
/* Don't do __builtin_saveregs more than once in a function.
Save the result of the first call and reuse it. */
if (saveregs_value != 0)
return saveregs_value;
/* When this function is called, it means that registers must be
saved on entry to this function. So we migrate the call to the
first insn of this function. */
start_sequence ();
#ifdef EXPAND_BUILTIN_SAVEREGS
/* Do whatever the machine needs done in this case. */
val = EXPAND_BUILTIN_SAVEREGS ();
#else
/* ??? We used to try and build up a call to the out of line function,
guessing about what registers needed saving etc. This became much
harder with __builtin_va_start, since we don't have a tree for a
call to __builtin_saveregs to fall back on. There was exactly one
port (i860) that used this code, and I'm unconvinced it could actually
handle the general case. So we no longer try to handle anything
weird and make the backend absorb the evil. */
error ("__builtin_saveregs not supported by this target");
val = const0_rtx;
#endif
seq = get_insns ();
end_sequence ();
saveregs_value = val;
/* Put the insns after the NOTE that starts the function. If this
is inside a start_sequence, make the outer-level insn chain current, so
the code is placed at the start of the function. */
push_topmost_sequence ();
emit_insn_after (seq, get_insns ());
pop_topmost_sequence ();
return val;
}
/* __builtin_args_info (N) returns word N of the arg space info
for the current function. The number and meanings of words
is controlled by the definition of CUMULATIVE_ARGS. */
static rtx
expand_builtin_args_info (exp)
tree exp;
{
tree arglist = TREE_OPERAND (exp, 1);
int nwords = sizeof (CUMULATIVE_ARGS) / sizeof (int);
int *word_ptr = (int *) &current_function_args_info;
#if 0
/* These are used by the code below that is if 0'ed away */
int i;
tree type, elts, result;
#endif
if (sizeof (CUMULATIVE_ARGS) % sizeof (int) != 0)
abort ();
if (arglist != 0)
{
if (!host_integerp (TREE_VALUE (arglist), 0))
error ("argument of `__builtin_args_info' must be constant");
else
{
HOST_WIDE_INT wordnum = tree_low_cst (TREE_VALUE (arglist), 0);
if (wordnum < 0 || wordnum >= nwords)
error ("argument of `__builtin_args_info' out of range");
else
return GEN_INT (word_ptr[wordnum]);
}
}
else
error ("missing argument in `__builtin_args_info'");
return const0_rtx;
#if 0
for (i = 0; i < nwords; i++)
elts = tree_cons (NULL_TREE, build_int_2 (word_ptr[i], 0));
type = build_array_type (integer_type_node,
build_index_type (build_int_2 (nwords, 0)));
result = build (CONSTRUCTOR, type, NULL_TREE, nreverse (elts));
TREE_CONSTANT (result) = 1;
TREE_STATIC (result) = 1;
result = build1 (INDIRECT_REF, build_pointer_type (type), result);
TREE_CONSTANT (result) = 1;
return expand_expr (result, NULL_RTX, VOIDmode, 0);
#endif
}
/* Expand ARGLIST, from a call to __builtin_next_arg. */
static rtx
expand_builtin_next_arg (arglist)
tree arglist;
{
tree fntype = TREE_TYPE (current_function_decl);
if (TYPE_ARG_TYPES (fntype) == 0
|| (TREE_VALUE (tree_last (TYPE_ARG_TYPES (fntype)))
== void_type_node))
{
error ("`va_start' used in function with fixed args");
return const0_rtx;
}
if (arglist)
{
tree last_parm = tree_last (DECL_ARGUMENTS (current_function_decl));
tree arg = TREE_VALUE (arglist);
/* Strip off all nops for the sake of the comparison. This
is not quite the same as STRIP_NOPS. It does more.
We must also strip off INDIRECT_EXPR for C++ reference
parameters. */
while (TREE_CODE (arg) == NOP_EXPR
|| TREE_CODE (arg) == CONVERT_EXPR
|| TREE_CODE (arg) == NON_LVALUE_EXPR
|| TREE_CODE (arg) == INDIRECT_REF)
arg = TREE_OPERAND (arg, 0);
if (arg != last_parm)
warning ("second parameter of `va_start' not last named argument");
}
else
/* Evidently an out of date version of <stdarg.h>; can't validate
va_start's second argument, but can still work as intended. */
warning ("`__builtin_next_arg' called without an argument");
return expand_binop (Pmode, add_optab,
current_function_internal_arg_pointer,
current_function_arg_offset_rtx,
NULL_RTX, 0, OPTAB_LIB_WIDEN);
}
/* Make it easier for the backends by protecting the valist argument
from multiple evaluations. */
static tree
stabilize_va_list (valist, needs_lvalue)
tree valist;
int needs_lvalue;
{
if (TREE_CODE (va_list_type_node) == ARRAY_TYPE)
{
if (TREE_SIDE_EFFECTS (valist))
valist = save_expr (valist);
/* For this case, the backends will be expecting a pointer to
TREE_TYPE (va_list_type_node), but it's possible we've
actually been given an array (an actual va_list_type_node).
So fix it. */
if (TREE_CODE (TREE_TYPE (valist)) == ARRAY_TYPE)
{
tree p1 = build_pointer_type (TREE_TYPE (va_list_type_node));
tree p2 = build_pointer_type (va_list_type_node);
valist = build1 (ADDR_EXPR, p2, valist);
valist = fold (build1 (NOP_EXPR, p1, valist));
}
}
else
{
tree pt;
if (! needs_lvalue)
{
if (! TREE_SIDE_EFFECTS (valist))
return valist;
pt = build_pointer_type (va_list_type_node);
valist = fold (build1 (ADDR_EXPR, pt, valist));
TREE_SIDE_EFFECTS (valist) = 1;
}
if (TREE_SIDE_EFFECTS (valist))
valist = save_expr (valist);
valist = fold (build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (valist)),
valist));
}
return valist;
}
/* The "standard" implementation of va_start: just assign `nextarg' to
the variable. */
void
std_expand_builtin_va_start (valist, nextarg)
tree valist;
rtx nextarg;
{
tree t;
t = build (MODIFY_EXPR, TREE_TYPE (valist), valist,
make_tree (ptr_type_node, nextarg));
TREE_SIDE_EFFECTS (t) = 1;
expand_expr (t, const0_rtx, VOIDmode, EXPAND_NORMAL);
}
/* Expand ARGLIST, from a call to __builtin_va_start. */
static rtx
expand_builtin_va_start (arglist)
tree arglist;
{
rtx nextarg;
tree chain, valist;
chain = TREE_CHAIN (arglist);
if (TREE_CHAIN (chain))
error ("too many arguments to function `va_start'");
nextarg = expand_builtin_next_arg (chain);
valist = stabilize_va_list (TREE_VALUE (arglist), 1);
#ifdef EXPAND_BUILTIN_VA_START
EXPAND_BUILTIN_VA_START (valist, nextarg);
#else
std_expand_builtin_va_start (valist, nextarg);
#endif
return const0_rtx;
}
/* The "standard" implementation of va_arg: read the value from the
current (padded) address and increment by the (padded) size.