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/* Translation of constants
Copyright (C) 2002-2022 Free Software Foundation, Inc.
Contributed by Paul Brook
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 3, 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 COPYING3. If not see
<http://www.gnu.org/licenses/>. */
/* trans-const.cc -- convert constant values */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tree.h"
#include "gfortran.h"
#include "options.h"
#include "trans.h"
#include "fold-const.h"
#include "stor-layout.h"
#include "realmpfr.h"
#include "trans-const.h"
#include "trans-types.h"
#include "target-memory.h"
tree gfc_rank_cst[GFC_MAX_DIMENSIONS + 1];
/* Build a constant with given type from an int_cst. */
tree
gfc_build_const (tree type, tree intval)
{
tree val;
tree zero;
switch (TREE_CODE (type))
{
case INTEGER_TYPE:
val = convert (type, intval);
break;
case REAL_TYPE:
val = build_real_from_int_cst (type, intval);
break;
case COMPLEX_TYPE:
val = build_real_from_int_cst (TREE_TYPE (type), intval);
zero = build_real_from_int_cst (TREE_TYPE (type), integer_zero_node);
val = build_complex (type, val, zero);
break;
default:
gcc_unreachable ();
}
return val;
}
/* Build a string constant with C char type. */
tree
gfc_build_string_const (size_t length, const char *s)
{
tree str;
tree len;
str = build_string (length, s);
len = size_int (length);
TREE_TYPE (str) =
build_array_type (gfc_character1_type_node,
build_range_type (gfc_charlen_type_node,
size_one_node, len));
TYPE_STRING_FLAG (TREE_TYPE (str)) = 1;
return str;
}
/* Build a string constant with a type given by its kind; take care of
non-default character kinds. */
tree
gfc_build_wide_string_const (int kind, size_t length, const gfc_char_t *string)
{
int i;
tree str, len;
size_t size;
char *s;
i = gfc_validate_kind (BT_CHARACTER, kind, false);
size = length * gfc_character_kinds[i].bit_size / 8;
s = XCNEWVAR (char, size);
gfc_encode_character (kind, length, string, (unsigned char *) s, size);
str = build_string (size, s);
free (s);
len = size_int (length);
TREE_TYPE (str) =
build_array_type (gfc_get_char_type (kind),
build_range_type (gfc_charlen_type_node,
size_one_node, len));
TYPE_STRING_FLAG (TREE_TYPE (str)) = 1;
return str;
}
/* Build a Fortran character constant from a zero-terminated string.
There a two version of this function, one that translates the string
and one that doesn't. */
tree
gfc_build_cstring_const (const char *string)
{
return gfc_build_string_const (strlen (string) + 1, string);
}
tree
gfc_build_localized_cstring_const (const char *msgid)
{
const char *localized = _(msgid);
return gfc_build_string_const (strlen (localized) + 1, localized);
}
/* Return a string constant with the given length. Used for static
initializers. The constant will be padded or truncated to match
length. */
tree
gfc_conv_string_init (tree length, gfc_expr * expr)
{
gfc_char_t *s;
HOST_WIDE_INT len;
gfc_charlen_t slen;
tree str;
bool free_s = false;
gcc_assert (expr->expr_type == EXPR_CONSTANT);
gcc_assert (expr->ts.type == BT_CHARACTER);
gcc_assert (tree_fits_uhwi_p (length));
len = TREE_INT_CST_LOW (length);
slen = expr->value.character.length;
if (len > slen)
{
s = gfc_get_wide_string (len);
memcpy (s, expr->value.character.string, slen * sizeof (gfc_char_t));
gfc_wide_memset (&s[slen], ' ', len - slen);
free_s = true;
}
else
s = expr->value.character.string;
str = gfc_build_wide_string_const (expr->ts.kind, len, s);
if (free_s)
free (s);
return str;
}
/* Create a tree node for the string length if it is constant. */
void
gfc_conv_const_charlen (gfc_charlen * cl)
{
if (!cl || cl->backend_decl)
return;
if (cl->length && cl->length->expr_type == EXPR_CONSTANT)
{
cl->backend_decl = gfc_conv_mpz_to_tree (cl->length->value.integer,
cl->length->ts.kind);
cl->backend_decl = fold_convert (gfc_charlen_type_node,
cl->backend_decl);
}
}
void
gfc_init_constants (void)
{
int n;
for (n = 0; n <= GFC_MAX_DIMENSIONS; n++)
gfc_rank_cst[n] = build_int_cst (gfc_array_index_type, n);
}
/* Converts a GMP integer into a backend tree node. */
tree
gfc_conv_mpz_to_tree (mpz_t i, int kind)
{
wide_int val = wi::from_mpz (gfc_get_int_type (kind), i, true);
return wide_int_to_tree (gfc_get_int_type (kind), val);
}
/* Convert a GMP integer into a tree node of type given by the type
argument. */
tree
gfc_conv_mpz_to_tree_type (mpz_t i, const tree type)
{
const wide_int val = wi::from_mpz (type, i, true);
return wide_int_to_tree (type, val);
}
/* Converts a backend tree into a GMP integer. */
void
gfc_conv_tree_to_mpz (mpz_t i, tree source)
{
wi::to_mpz (wi::to_wide (source), i, TYPE_SIGN (TREE_TYPE (source)));
}
/* Converts a real constant into backend form. */
tree
gfc_conv_mpfr_to_tree (mpfr_t f, int kind, int is_snan)
{
tree type;
int n;
REAL_VALUE_TYPE real;
n = gfc_validate_kind (BT_REAL, kind, false);
gcc_assert (gfc_real_kinds[n].radix == 2);
type = gfc_get_real_type (kind);
if (mpfr_nan_p (f) && is_snan)
real_from_string (&real, "SNaN");
else
real_from_mpfr (&real, f, type, GFC_RND_MODE);
return build_real (type, real);
}
/* Returns a real constant that is +Infinity if the target
supports infinities for this floating-point mode, and
+HUGE_VAL otherwise (the largest representable number). */
tree
gfc_build_inf_or_huge (tree type, int kind)
{
if (HONOR_INFINITIES (TYPE_MODE (type)))
{
REAL_VALUE_TYPE real;
real_inf (&real);
return build_real (type, real);
}
else
{
int k = gfc_validate_kind (BT_REAL, kind, false);
return gfc_conv_mpfr_to_tree (gfc_real_kinds[k].huge, kind, 0);
}
}
/* Returns a floating-point NaN of a given type. */
tree
gfc_build_nan (tree type, const char *str)
{
REAL_VALUE_TYPE real;
real_nan (&real, str, 1, TYPE_MODE (type));
return build_real (type, real);
}
/* Converts a backend tree into a real constant. */
void
gfc_conv_tree_to_mpfr (mpfr_ptr f, tree source)
{
mpfr_from_real (f, TREE_REAL_CST_PTR (source), GFC_RND_MODE);
}
/* Translate any literal constant to a tree. Constants never have
pre or post chains. Character literal constants are special
special because they have a value and a length, so they cannot be
returned as a single tree. It is up to the caller to set the
length somewhere if necessary.
Returns the translated constant, or aborts if it gets a type it
can't handle. */
tree
gfc_conv_constant_to_tree (gfc_expr * expr)
{
tree res;
gcc_assert (expr->expr_type == EXPR_CONSTANT);
/* If it is has a prescribed memory representation, we build a string
constant and VIEW_CONVERT to its type. */
switch (expr->ts.type)
{
case BT_INTEGER:
if (expr->representation.string)
return fold_build1_loc (input_location, VIEW_CONVERT_EXPR,
gfc_get_int_type (expr->ts.kind),
gfc_build_string_const (expr->representation.length,
expr->representation.string));
else
return gfc_conv_mpz_to_tree (expr->value.integer, expr->ts.kind);
case BT_REAL:
if (expr->representation.string)
return fold_build1_loc (input_location, VIEW_CONVERT_EXPR,
gfc_get_real_type (expr->ts.kind),
gfc_build_string_const (expr->representation.length,
expr->representation.string));
else
return gfc_conv_mpfr_to_tree (expr->value.real, expr->ts.kind, expr->is_snan);
case BT_LOGICAL:
if (expr->representation.string)
{
tree tmp = fold_build1_loc (input_location, VIEW_CONVERT_EXPR,
gfc_get_int_type (expr->ts.kind),
gfc_build_string_const (expr->representation.length,
expr->representation.string));
if (!integer_zerop (tmp) && !integer_onep (tmp))
gfc_warning (flag_dec_char_conversions ? OPT_Wsurprising : 0,
"Assigning value other than 0 or 1 to LOGICAL has "
"undefined result at %L", &expr->where);
return fold_convert (gfc_get_logical_type (expr->ts.kind), tmp);
}
else
return build_int_cst (gfc_get_logical_type (expr->ts.kind),
expr->value.logical);
case BT_COMPLEX:
if (expr->representation.string)
return fold_build1_loc (input_location, VIEW_CONVERT_EXPR,
gfc_get_complex_type (expr->ts.kind),
gfc_build_string_const (expr->representation.length,
expr->representation.string));
else
{
tree real = gfc_conv_mpfr_to_tree (mpc_realref (expr->value.complex),
expr->ts.kind, expr->is_snan);
tree imag = gfc_conv_mpfr_to_tree (mpc_imagref (expr->value.complex),
expr->ts.kind, expr->is_snan);
return build_complex (gfc_typenode_for_spec (&expr->ts),
real, imag);
}
case BT_CHARACTER:
res = gfc_build_wide_string_const (expr->ts.kind,
expr->value.character.length,
expr->value.character.string);
return res;
case BT_HOLLERITH:
return gfc_build_string_const (expr->representation.length,
expr->representation.string);
default:
gcc_unreachable ();
}
}
/* Like gfc_conv_constant_to_tree, but for a simplified expression.
We can handle character literal constants here as well. */
void
gfc_conv_constant (gfc_se * se, gfc_expr * expr)
{
gfc_ss *ss;
/* We may be receiving an expression for C_NULL_PTR or C_NULL_FUNPTR. If
so, the expr_type will not yet be an EXPR_CONSTANT. We need to make
it so here. */
if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
&& expr->ts.u.derived->attr.is_iso_c)
{
if (expr->symtree->n.sym->intmod_sym_id == ISOCBINDING_NULL_PTR
|| expr->symtree->n.sym->intmod_sym_id == ISOCBINDING_NULL_FUNPTR)
{
/* Create a new EXPR_CONSTANT expression for our local uses. */
expr = gfc_get_int_expr (gfc_default_integer_kind, NULL, 0);
}
}
if (expr->expr_type != EXPR_CONSTANT)
{
gfc_expr *e = gfc_get_int_expr (gfc_default_integer_kind, NULL, 0);
gfc_error ("non-constant initialization expression at %L", &expr->where);
se->expr = gfc_conv_constant_to_tree (e);
return;
}
ss = se->ss;
if (ss != NULL)
{
gfc_ss_info *ss_info;
ss_info = ss->info;
gcc_assert (ss != gfc_ss_terminator);
gcc_assert (ss_info->type == GFC_SS_SCALAR);
gcc_assert (ss_info->expr == expr);
se->expr = ss_info->data.scalar.value;
se->string_length = ss_info->string_length;
gfc_advance_se_ss_chain (se);
return;
}
/* Translate the constant and put it in the simplifier structure. */
se->expr = gfc_conv_constant_to_tree (expr);
/* If this is a CHARACTER string, set its length in the simplifier
structure, too. */
if (expr->ts.type == BT_CHARACTER)
se->string_length = TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (se->expr)));
}