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/* Translation of constants
Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 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.c -- convert constant values */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tree.h"
#include "ggc.h"
#include "toplev.h"
#include "real.h"
#include "double-int.h"
#include "gfortran.h"
#include "trans.h"
#include "trans-const.h"
#include "trans-types.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;
}
tree
gfc_build_string_const (int length, const char *s)
{
tree str;
tree len;
str = build_string (length, s);
len = build_int_cst (NULL_TREE, length);
TREE_TYPE (str) =
build_array_type (gfc_character1_type_node,
build_range_type (gfc_charlen_type_node,
integer_one_node, len));
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;
char *c;
HOST_WIDE_INT len;
int slen;
tree str;
gcc_assert (expr->expr_type == EXPR_CONSTANT);
gcc_assert (expr->ts.type == BT_CHARACTER && expr->ts.kind == 1);
gcc_assert (INTEGER_CST_P (length));
gcc_assert (TREE_INT_CST_HIGH (length) == 0);
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);
/* FIXME -- currently ignore wide character strings; see assert
above. */
c = gfc_widechar_to_char (s, len);
gfc_free (s);
}
else
c = gfc_widechar_to_char (expr->value.character.string,
expr->value.character.length);
str = gfc_build_string_const (len, c);
gfc_free (c);
return str;
}
/* Create a tree node for the string length if it is constant. */
void
gfc_conv_const_charlen (gfc_charlen * cl)
{
if (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)
{
double_int val = mpz_get_double_int (gfc_get_int_type (kind), i, true);
return double_int_to_tree (gfc_get_int_type (kind), val);
}
/* Converts a backend tree into a GMP integer. */
void
gfc_conv_tree_to_mpz (mpz_t i, tree source)
{
double_int val = tree_to_double_int (source);
mpz_set_double_int (i, val, TYPE_UNSIGNED (TREE_TYPE (source)));
}
/* Converts a real constant into backend form. */
tree
gfc_conv_mpfr_to_tree (mpfr_t f, int kind)
{
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);
real_from_mpfr (&real, f, type, GFC_RND_MODE);
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;
char *s;
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 (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 (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);
case BT_LOGICAL:
if (expr->representation.string)
return fold_build1 (VIEW_CONVERT_EXPR,
gfc_get_logical_type (expr->ts.kind),
gfc_build_string_const (expr->representation.length,
expr->representation.string));
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 (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 (expr->value.complex.r,
expr->ts.kind);
tree imag = gfc_conv_mpfr_to_tree (expr->value.complex.i,
expr->ts.kind);
return build_complex (gfc_typenode_for_spec (&expr->ts),
real, imag);
}
case BT_CHARACTER:
gcc_assert (expr->ts.kind == 1);
s = gfc_widechar_to_char (expr->value.character.string,
expr->value.character.length);
res = gfc_build_string_const (expr->value.character.length, s);
gfc_free (s);
return res;
case BT_HOLLERITH:
return gfc_build_string_const (expr->representation.length,
expr->representation.string);
default:
fatal_error ("gfc_conv_constant_to_tree(): invalid type: %s",
gfc_typename (&expr->ts));
}
}
/* 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)
{
/* We may be receiving an expression for C_NULL_PTR or C_NULL_FUNPTR. If
so, they expr_type will not yet be an EXPR_CONSTANT. We need to make
it so here. */
if (expr->ts.type == BT_DERIVED && expr->ts.derived
&& expr->ts.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_int_expr (0);
}
}
gcc_assert (expr->expr_type == EXPR_CONSTANT);
if (se->ss != NULL)
{
gcc_assert (se->ss != gfc_ss_terminator);
gcc_assert (se->ss->type == GFC_SS_SCALAR);
gcc_assert (se->ss->expr == expr);
se->expr = se->ss->data.scalar.expr;
se->string_length = se->ss->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)));
}
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