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Diffstat (limited to 'gcc/fortran/trans-const.cc')
| -rw-r--r-- | gcc/fortran/trans-const.cc | 430 |
1 files changed, 430 insertions, 0 deletions
diff --git a/gcc/fortran/trans-const.cc b/gcc/fortran/trans-const.cc new file mode 100644 index 0000000..35167b4 --- /dev/null +++ b/gcc/fortran/trans-const.cc @@ -0,0 +1,430 @@ +/* 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.c -- 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))); +} |