122 lines
3.5 KiB
C
122 lines
3.5 KiB
C
/* Data type conversion
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Copyright (C) 1987-2021 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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/* This file contains the functions for converting expressions to
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different data types for the translation of the gfortran internal
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representation to GIMPLE. The only entry point is `convert'. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tree.h"
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#include "fold-const.h"
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#include "convert.h"
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#include "gfortran.h"
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#include "trans.h"
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#include "trans-types.h"
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/* Prepare expr to be an argument of a TRUTH_NOT_EXPR,
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or validate its data type for a GIMPLE `if' or `while' statement.
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The resulting type should always be `logical_type_node'. */
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static tree
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truthvalue_conversion (tree expr)
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{
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switch (TREE_CODE (TREE_TYPE (expr)))
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{
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case BOOLEAN_TYPE:
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if (TREE_TYPE (expr) == logical_type_node)
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return expr;
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else if (COMPARISON_CLASS_P (expr))
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{
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TREE_TYPE (expr) = logical_type_node;
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return expr;
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}
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else if (TREE_CODE (expr) == NOP_EXPR)
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return fold_build1_loc (input_location, NOP_EXPR,
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logical_type_node,
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TREE_OPERAND (expr, 0));
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else
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return fold_build1_loc (input_location, NOP_EXPR,
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logical_type_node,
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expr);
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case INTEGER_TYPE:
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if (TREE_CODE (expr) == INTEGER_CST)
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return integer_zerop (expr) ? logical_false_node
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: logical_true_node;
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else
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return fold_build2_loc (input_location, NE_EXPR,
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logical_type_node,
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expr, build_int_cst (TREE_TYPE (expr), 0));
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default:
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gcc_unreachable ();
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}
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}
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/* Create an expression whose value is that of EXPR,
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converted to type TYPE. The TREE_TYPE of the value
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is always TYPE. This function implements all reasonable
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conversions; callers should filter out those that are
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not permitted by the language being compiled. */
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tree
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convert (tree type, tree expr)
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{
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tree e = expr;
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enum tree_code code;
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if (type == TREE_TYPE (expr))
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return expr;
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if (TREE_CODE (type) == ERROR_MARK
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|| TREE_CODE (expr) == ERROR_MARK
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|| TREE_CODE (TREE_TYPE (expr)) == ERROR_MARK)
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return expr;
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gcc_checking_assert (TREE_CODE (TREE_TYPE (expr)) != VOID_TYPE);
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if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr)))
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return fold_build1_loc (input_location, NOP_EXPR, type, expr);
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code = TREE_CODE (type);
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if (code == VOID_TYPE)
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return fold_build1_loc (input_location, CONVERT_EXPR, type, e);
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if (code == BOOLEAN_TYPE)
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return fold_build1_loc (input_location, NOP_EXPR, type,
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truthvalue_conversion (e));
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if (code == INTEGER_TYPE)
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return fold (convert_to_integer (type, e));
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if (code == POINTER_TYPE || code == REFERENCE_TYPE)
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return fold (convert_to_pointer (type, e));
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if (code == REAL_TYPE)
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return fold (convert_to_real (type, e));
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if (code == COMPLEX_TYPE)
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return fold (convert_to_complex (type, e));
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if (code == VECTOR_TYPE)
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return fold (convert_to_vector (type, e));
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gcc_unreachable ();
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}
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