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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [fortran/] [trans-const.c] - Rev 414
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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" #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 (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 string constant with a type given by its kind; take care of non-default character kinds. */ tree gfc_build_wide_string_const (int kind, int 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); gfc_free (s); len = build_int_cst (NULL_TREE, length); TREE_TYPE (str) = build_array_type (gfc_get_char_type (kind), 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; HOST_WIDE_INT len; int slen; tree str; bool free_s = false; gcc_assert (expr->expr_type == EXPR_CONSTANT); gcc_assert (expr->ts.type == BT_CHARACTER); 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); free_s = true; } else s = expr->value.character.string; str = gfc_build_wide_string_const (expr->ts.kind, len, s); if (free_s) gfc_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) { 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, 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); } /* 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 (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, expr->is_snan); case BT_LOGICAL: if (expr->representation.string) { tree tmp = fold_build1 (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 ("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 (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: 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, 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_int_expr (0); } } if (expr->expr_type != EXPR_CONSTANT) { gfc_error ("non-constant initialization expression at %L", &expr->where); se->expr = gfc_conv_constant_to_tree (gfc_int_expr (0)); return; } 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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