1613 lines
43 KiB
C
1613 lines
43 KiB
C
/* Perform arithmetic and other operations on values, for GDB.
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Copyright (C) 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996,
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1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008
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Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
|
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the Free Software Foundation; either version 3 of the License, or
|
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(at your option) any later version.
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|
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License 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 this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "value.h"
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#include "symtab.h"
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#include "gdbtypes.h"
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#include "expression.h"
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#include "target.h"
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#include "language.h"
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#include "gdb_string.h"
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#include "doublest.h"
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#include "dfp.h"
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#include <math.h>
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#include "infcall.h"
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/* Define whether or not the C operator '/' truncates towards zero for
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differently signed operands (truncation direction is undefined in C). */
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#ifndef TRUNCATION_TOWARDS_ZERO
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#define TRUNCATION_TOWARDS_ZERO ((-5 / 2) == -2)
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#endif
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static struct value *value_subscripted_rvalue (struct value *, struct value *, int);
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void _initialize_valarith (void);
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/* Given a pointer, return the size of its target.
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If the pointer type is void *, then return 1.
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If the target type is incomplete, then error out.
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This isn't a general purpose function, but just a
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helper for value_sub & value_add.
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*/
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static LONGEST
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find_size_for_pointer_math (struct type *ptr_type)
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{
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LONGEST sz = -1;
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struct type *ptr_target;
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ptr_target = check_typedef (TYPE_TARGET_TYPE (ptr_type));
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sz = TYPE_LENGTH (ptr_target);
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if (sz == 0)
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{
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if (TYPE_CODE (ptr_type) == TYPE_CODE_VOID)
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sz = 1;
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else
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{
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char *name;
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name = TYPE_NAME (ptr_target);
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if (name == NULL)
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name = TYPE_TAG_NAME (ptr_target);
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if (name == NULL)
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error (_("Cannot perform pointer math on incomplete types, "
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"try casting to a known type, or void *."));
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else
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error (_("Cannot perform pointer math on incomplete type \"%s\", "
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"try casting to a known type, or void *."), name);
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}
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}
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return sz;
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}
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struct value *
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value_add (struct value *arg1, struct value *arg2)
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{
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struct value *valint;
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struct value *valptr;
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LONGEST sz;
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struct type *type1, *type2, *valptrtype;
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arg1 = coerce_array (arg1);
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arg2 = coerce_array (arg2);
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type1 = check_typedef (value_type (arg1));
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type2 = check_typedef (value_type (arg2));
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if ((TYPE_CODE (type1) == TYPE_CODE_PTR
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|| TYPE_CODE (type2) == TYPE_CODE_PTR)
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&&
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(is_integral_type (type1) || is_integral_type (type2)))
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/* Exactly one argument is a pointer, and one is an integer. */
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{
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struct value *retval;
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if (TYPE_CODE (type1) == TYPE_CODE_PTR)
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{
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valptr = arg1;
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valint = arg2;
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valptrtype = type1;
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}
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else
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{
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valptr = arg2;
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valint = arg1;
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valptrtype = type2;
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}
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sz = find_size_for_pointer_math (valptrtype);
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retval = value_from_pointer (valptrtype,
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value_as_address (valptr)
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+ (sz * value_as_long (valint)));
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return retval;
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}
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return value_binop (arg1, arg2, BINOP_ADD);
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}
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struct value *
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value_sub (struct value *arg1, struct value *arg2)
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{
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struct type *type1, *type2;
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arg1 = coerce_array (arg1);
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arg2 = coerce_array (arg2);
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type1 = check_typedef (value_type (arg1));
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type2 = check_typedef (value_type (arg2));
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if (TYPE_CODE (type1) == TYPE_CODE_PTR)
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{
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if (is_integral_type (type2))
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{
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/* pointer - integer. */
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LONGEST sz = find_size_for_pointer_math (type1);
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return value_from_pointer (type1,
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(value_as_address (arg1)
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- (sz * value_as_long (arg2))));
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}
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else if (TYPE_CODE (type2) == TYPE_CODE_PTR
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&& TYPE_LENGTH (check_typedef (TYPE_TARGET_TYPE (type1)))
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== TYPE_LENGTH (check_typedef (TYPE_TARGET_TYPE (type2))))
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{
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/* pointer to <type x> - pointer to <type x>. */
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LONGEST sz = TYPE_LENGTH (check_typedef (TYPE_TARGET_TYPE (type1)));
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return value_from_longest
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(builtin_type_long, /* FIXME -- should be ptrdiff_t */
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(value_as_long (arg1) - value_as_long (arg2)) / sz);
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}
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else
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{
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error (_("\
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First argument of `-' is a pointer and second argument is neither\n\
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an integer nor a pointer of the same type."));
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}
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}
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return value_binop (arg1, arg2, BINOP_SUB);
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}
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/* Return the value of ARRAY[IDX].
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See comments in value_coerce_array() for rationale for reason for
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doing lower bounds adjustment here rather than there.
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FIXME: Perhaps we should validate that the index is valid and if
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verbosity is set, warn about invalid indices (but still use them). */
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struct value *
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value_subscript (struct value *array, struct value *idx)
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{
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struct value *bound;
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int c_style = current_language->c_style_arrays;
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struct type *tarray;
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array = coerce_ref (array);
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tarray = check_typedef (value_type (array));
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if (TYPE_CODE (tarray) == TYPE_CODE_ARRAY
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|| TYPE_CODE (tarray) == TYPE_CODE_STRING)
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{
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struct type *range_type = TYPE_INDEX_TYPE (tarray);
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LONGEST lowerbound, upperbound;
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get_discrete_bounds (range_type, &lowerbound, &upperbound);
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if (VALUE_LVAL (array) != lval_memory)
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return value_subscripted_rvalue (array, idx, lowerbound);
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if (c_style == 0)
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{
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LONGEST index = value_as_long (idx);
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if (index >= lowerbound && index <= upperbound)
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return value_subscripted_rvalue (array, idx, lowerbound);
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/* Emit warning unless we have an array of unknown size.
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An array of unknown size has lowerbound 0 and upperbound -1. */
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if (upperbound > -1)
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warning (_("array or string index out of range"));
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/* fall doing C stuff */
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c_style = 1;
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}
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if (lowerbound != 0)
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{
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bound = value_from_longest (builtin_type_int, (LONGEST) lowerbound);
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idx = value_sub (idx, bound);
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}
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array = value_coerce_array (array);
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}
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if (TYPE_CODE (tarray) == TYPE_CODE_BITSTRING)
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{
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struct type *range_type = TYPE_INDEX_TYPE (tarray);
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LONGEST index = value_as_long (idx);
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struct value *v;
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int offset, byte, bit_index;
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LONGEST lowerbound, upperbound;
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get_discrete_bounds (range_type, &lowerbound, &upperbound);
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if (index < lowerbound || index > upperbound)
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error (_("bitstring index out of range"));
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index -= lowerbound;
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offset = index / TARGET_CHAR_BIT;
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byte = *((char *) value_contents (array) + offset);
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bit_index = index % TARGET_CHAR_BIT;
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byte >>= (gdbarch_bits_big_endian (current_gdbarch) ?
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TARGET_CHAR_BIT - 1 - bit_index : bit_index);
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v = value_from_longest (LA_BOOL_TYPE, byte & 1);
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set_value_bitpos (v, bit_index);
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set_value_bitsize (v, 1);
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VALUE_LVAL (v) = VALUE_LVAL (array);
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if (VALUE_LVAL (array) == lval_internalvar)
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VALUE_LVAL (v) = lval_internalvar_component;
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VALUE_ADDRESS (v) = VALUE_ADDRESS (array);
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VALUE_FRAME_ID (v) = VALUE_FRAME_ID (array);
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set_value_offset (v, offset + value_offset (array));
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return v;
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}
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if (c_style)
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return value_ind (value_add (array, idx));
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else
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error (_("not an array or string"));
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||
}
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/* Return the value of EXPR[IDX], expr an aggregate rvalue
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(eg, a vector register). This routine used to promote floats
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to doubles, but no longer does. */
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||
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static struct value *
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value_subscripted_rvalue (struct value *array, struct value *idx, int lowerbound)
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{
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struct type *array_type = check_typedef (value_type (array));
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struct type *elt_type = check_typedef (TYPE_TARGET_TYPE (array_type));
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unsigned int elt_size = TYPE_LENGTH (elt_type);
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LONGEST index = value_as_long (idx);
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unsigned int elt_offs = elt_size * longest_to_int (index - lowerbound);
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struct value *v;
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if (index < lowerbound || elt_offs >= TYPE_LENGTH (array_type))
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error (_("no such vector element"));
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v = allocate_value (elt_type);
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if (value_lazy (array))
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set_value_lazy (v, 1);
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else
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memcpy (value_contents_writeable (v),
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value_contents (array) + elt_offs, elt_size);
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if (VALUE_LVAL (array) == lval_internalvar)
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VALUE_LVAL (v) = lval_internalvar_component;
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else
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VALUE_LVAL (v) = VALUE_LVAL (array);
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VALUE_ADDRESS (v) = VALUE_ADDRESS (array);
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VALUE_REGNUM (v) = VALUE_REGNUM (array);
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VALUE_FRAME_ID (v) = VALUE_FRAME_ID (array);
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set_value_offset (v, value_offset (array) + elt_offs);
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return v;
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||
}
|
||
|
||
/* Check to see if either argument is a structure, or a reference to
|
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one. This is called so we know whether to go ahead with the normal
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binop or look for a user defined function instead.
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||
For now, we do not overload the `=' operator. */
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int
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binop_user_defined_p (enum exp_opcode op, struct value *arg1, struct value *arg2)
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{
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struct type *type1, *type2;
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if (op == BINOP_ASSIGN || op == BINOP_CONCAT)
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return 0;
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type1 = check_typedef (value_type (arg1));
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if (TYPE_CODE (type1) == TYPE_CODE_REF)
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type1 = check_typedef (TYPE_TARGET_TYPE (type1));
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type2 = check_typedef (value_type (arg2));
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if (TYPE_CODE (type2) == TYPE_CODE_REF)
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type2 = check_typedef (TYPE_TARGET_TYPE (type2));
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return (TYPE_CODE (type1) == TYPE_CODE_STRUCT
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|| TYPE_CODE (type2) == TYPE_CODE_STRUCT);
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||
}
|
||
|
||
/* Check to see if argument is a structure. This is called so
|
||
we know whether to go ahead with the normal unop or look for a
|
||
user defined function instead.
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||
|
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For now, we do not overload the `&' operator. */
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int
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unop_user_defined_p (enum exp_opcode op, struct value *arg1)
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{
|
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struct type *type1;
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if (op == UNOP_ADDR)
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return 0;
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type1 = check_typedef (value_type (arg1));
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for (;;)
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||
{
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if (TYPE_CODE (type1) == TYPE_CODE_STRUCT)
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return 1;
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else if (TYPE_CODE (type1) == TYPE_CODE_REF)
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type1 = TYPE_TARGET_TYPE (type1);
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else
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return 0;
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||
}
|
||
}
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||
|
||
/* We know either arg1 or arg2 is a structure, so try to find the right
|
||
user defined function. Create an argument vector that calls
|
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arg1.operator @ (arg1,arg2) and return that value (where '@' is any
|
||
binary operator which is legal for GNU C++).
|
||
|
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OP is the operatore, and if it is BINOP_ASSIGN_MODIFY, then OTHEROP
|
||
is the opcode saying how to modify it. Otherwise, OTHEROP is
|
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unused. */
|
||
|
||
struct value *
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||
value_x_binop (struct value *arg1, struct value *arg2, enum exp_opcode op,
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||
enum exp_opcode otherop, enum noside noside)
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||
{
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||
struct value **argvec;
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||
char *ptr;
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||
char tstr[13];
|
||
int static_memfuncp;
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||
|
||
arg1 = coerce_ref (arg1);
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arg2 = coerce_ref (arg2);
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||
arg1 = coerce_enum (arg1);
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arg2 = coerce_enum (arg2);
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||
|
||
/* now we know that what we have to do is construct our
|
||
arg vector and find the right function to call it with. */
|
||
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||
if (TYPE_CODE (check_typedef (value_type (arg1))) != TYPE_CODE_STRUCT)
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error (_("Can't do that binary op on that type")); /* FIXME be explicit */
|
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|
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argvec = (struct value **) alloca (sizeof (struct value *) * 4);
|
||
argvec[1] = value_addr (arg1);
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argvec[2] = arg2;
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argvec[3] = 0;
|
||
|
||
/* make the right function name up */
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strcpy (tstr, "operator__");
|
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ptr = tstr + 8;
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switch (op)
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{
|
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case BINOP_ADD:
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strcpy (ptr, "+");
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break;
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case BINOP_SUB:
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strcpy (ptr, "-");
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||
break;
|
||
case BINOP_MUL:
|
||
strcpy (ptr, "*");
|
||
break;
|
||
case BINOP_DIV:
|
||
strcpy (ptr, "/");
|
||
break;
|
||
case BINOP_REM:
|
||
strcpy (ptr, "%");
|
||
break;
|
||
case BINOP_LSH:
|
||
strcpy (ptr, "<<");
|
||
break;
|
||
case BINOP_RSH:
|
||
strcpy (ptr, ">>");
|
||
break;
|
||
case BINOP_BITWISE_AND:
|
||
strcpy (ptr, "&");
|
||
break;
|
||
case BINOP_BITWISE_IOR:
|
||
strcpy (ptr, "|");
|
||
break;
|
||
case BINOP_BITWISE_XOR:
|
||
strcpy (ptr, "^");
|
||
break;
|
||
case BINOP_LOGICAL_AND:
|
||
strcpy (ptr, "&&");
|
||
break;
|
||
case BINOP_LOGICAL_OR:
|
||
strcpy (ptr, "||");
|
||
break;
|
||
case BINOP_MIN:
|
||
strcpy (ptr, "<?");
|
||
break;
|
||
case BINOP_MAX:
|
||
strcpy (ptr, ">?");
|
||
break;
|
||
case BINOP_ASSIGN:
|
||
strcpy (ptr, "=");
|
||
break;
|
||
case BINOP_ASSIGN_MODIFY:
|
||
switch (otherop)
|
||
{
|
||
case BINOP_ADD:
|
||
strcpy (ptr, "+=");
|
||
break;
|
||
case BINOP_SUB:
|
||
strcpy (ptr, "-=");
|
||
break;
|
||
case BINOP_MUL:
|
||
strcpy (ptr, "*=");
|
||
break;
|
||
case BINOP_DIV:
|
||
strcpy (ptr, "/=");
|
||
break;
|
||
case BINOP_REM:
|
||
strcpy (ptr, "%=");
|
||
break;
|
||
case BINOP_BITWISE_AND:
|
||
strcpy (ptr, "&=");
|
||
break;
|
||
case BINOP_BITWISE_IOR:
|
||
strcpy (ptr, "|=");
|
||
break;
|
||
case BINOP_BITWISE_XOR:
|
||
strcpy (ptr, "^=");
|
||
break;
|
||
case BINOP_MOD: /* invalid */
|
||
default:
|
||
error (_("Invalid binary operation specified."));
|
||
}
|
||
break;
|
||
case BINOP_SUBSCRIPT:
|
||
strcpy (ptr, "[]");
|
||
break;
|
||
case BINOP_EQUAL:
|
||
strcpy (ptr, "==");
|
||
break;
|
||
case BINOP_NOTEQUAL:
|
||
strcpy (ptr, "!=");
|
||
break;
|
||
case BINOP_LESS:
|
||
strcpy (ptr, "<");
|
||
break;
|
||
case BINOP_GTR:
|
||
strcpy (ptr, ">");
|
||
break;
|
||
case BINOP_GEQ:
|
||
strcpy (ptr, ">=");
|
||
break;
|
||
case BINOP_LEQ:
|
||
strcpy (ptr, "<=");
|
||
break;
|
||
case BINOP_MOD: /* invalid */
|
||
default:
|
||
error (_("Invalid binary operation specified."));
|
||
}
|
||
|
||
argvec[0] = value_struct_elt (&arg1, argvec + 1, tstr, &static_memfuncp, "structure");
|
||
|
||
if (argvec[0])
|
||
{
|
||
if (static_memfuncp)
|
||
{
|
||
argvec[1] = argvec[0];
|
||
argvec++;
|
||
}
|
||
if (noside == EVAL_AVOID_SIDE_EFFECTS)
|
||
{
|
||
struct type *return_type;
|
||
return_type
|
||
= TYPE_TARGET_TYPE (check_typedef (value_type (argvec[0])));
|
||
return value_zero (return_type, VALUE_LVAL (arg1));
|
||
}
|
||
return call_function_by_hand (argvec[0], 2 - static_memfuncp, argvec + 1);
|
||
}
|
||
error (_("member function %s not found"), tstr);
|
||
#ifdef lint
|
||
return call_function_by_hand (argvec[0], 2 - static_memfuncp, argvec + 1);
|
||
#endif
|
||
}
|
||
|
||
/* We know that arg1 is a structure, so try to find a unary user
|
||
defined operator that matches the operator in question.
|
||
Create an argument vector that calls arg1.operator @ (arg1)
|
||
and return that value (where '@' is (almost) any unary operator which
|
||
is legal for GNU C++). */
|
||
|
||
struct value *
|
||
value_x_unop (struct value *arg1, enum exp_opcode op, enum noside noside)
|
||
{
|
||
struct value **argvec;
|
||
char *ptr, *mangle_ptr;
|
||
char tstr[13], mangle_tstr[13];
|
||
int static_memfuncp, nargs;
|
||
|
||
arg1 = coerce_ref (arg1);
|
||
arg1 = coerce_enum (arg1);
|
||
|
||
/* now we know that what we have to do is construct our
|
||
arg vector and find the right function to call it with. */
|
||
|
||
if (TYPE_CODE (check_typedef (value_type (arg1))) != TYPE_CODE_STRUCT)
|
||
error (_("Can't do that unary op on that type")); /* FIXME be explicit */
|
||
|
||
argvec = (struct value **) alloca (sizeof (struct value *) * 4);
|
||
argvec[1] = value_addr (arg1);
|
||
argvec[2] = 0;
|
||
|
||
nargs = 1;
|
||
|
||
/* make the right function name up */
|
||
strcpy (tstr, "operator__");
|
||
ptr = tstr + 8;
|
||
strcpy (mangle_tstr, "__");
|
||
mangle_ptr = mangle_tstr + 2;
|
||
switch (op)
|
||
{
|
||
case UNOP_PREINCREMENT:
|
||
strcpy (ptr, "++");
|
||
break;
|
||
case UNOP_PREDECREMENT:
|
||
strcpy (ptr, "--");
|
||
break;
|
||
case UNOP_POSTINCREMENT:
|
||
strcpy (ptr, "++");
|
||
argvec[2] = value_from_longest (builtin_type_int, 0);
|
||
argvec[3] = 0;
|
||
nargs ++;
|
||
break;
|
||
case UNOP_POSTDECREMENT:
|
||
strcpy (ptr, "--");
|
||
argvec[2] = value_from_longest (builtin_type_int, 0);
|
||
argvec[3] = 0;
|
||
nargs ++;
|
||
break;
|
||
case UNOP_LOGICAL_NOT:
|
||
strcpy (ptr, "!");
|
||
break;
|
||
case UNOP_COMPLEMENT:
|
||
strcpy (ptr, "~");
|
||
break;
|
||
case UNOP_NEG:
|
||
strcpy (ptr, "-");
|
||
break;
|
||
case UNOP_PLUS:
|
||
strcpy (ptr, "+");
|
||
break;
|
||
case UNOP_IND:
|
||
strcpy (ptr, "*");
|
||
break;
|
||
default:
|
||
error (_("Invalid unary operation specified."));
|
||
}
|
||
|
||
argvec[0] = value_struct_elt (&arg1, argvec + 1, tstr, &static_memfuncp, "structure");
|
||
|
||
if (argvec[0])
|
||
{
|
||
if (static_memfuncp)
|
||
{
|
||
argvec[1] = argvec[0];
|
||
nargs --;
|
||
argvec++;
|
||
}
|
||
if (noside == EVAL_AVOID_SIDE_EFFECTS)
|
||
{
|
||
struct type *return_type;
|
||
return_type
|
||
= TYPE_TARGET_TYPE (check_typedef (value_type (argvec[0])));
|
||
return value_zero (return_type, VALUE_LVAL (arg1));
|
||
}
|
||
return call_function_by_hand (argvec[0], nargs, argvec + 1);
|
||
}
|
||
error (_("member function %s not found"), tstr);
|
||
return 0; /* For lint -- never reached */
|
||
}
|
||
|
||
|
||
/* Concatenate two values with the following conditions:
|
||
|
||
(1) Both values must be either bitstring values or character string
|
||
values and the resulting value consists of the concatenation of
|
||
ARG1 followed by ARG2.
|
||
|
||
or
|
||
|
||
One value must be an integer value and the other value must be
|
||
either a bitstring value or character string value, which is
|
||
to be repeated by the number of times specified by the integer
|
||
value.
|
||
|
||
|
||
(2) Boolean values are also allowed and are treated as bit string
|
||
values of length 1.
|
||
|
||
(3) Character values are also allowed and are treated as character
|
||
string values of length 1.
|
||
*/
|
||
|
||
struct value *
|
||
value_concat (struct value *arg1, struct value *arg2)
|
||
{
|
||
struct value *inval1;
|
||
struct value *inval2;
|
||
struct value *outval = NULL;
|
||
int inval1len, inval2len;
|
||
int count, idx;
|
||
char *ptr;
|
||
char inchar;
|
||
struct type *type1 = check_typedef (value_type (arg1));
|
||
struct type *type2 = check_typedef (value_type (arg2));
|
||
|
||
/* First figure out if we are dealing with two values to be concatenated
|
||
or a repeat count and a value to be repeated. INVAL1 is set to the
|
||
first of two concatenated values, or the repeat count. INVAL2 is set
|
||
to the second of the two concatenated values or the value to be
|
||
repeated. */
|
||
|
||
if (TYPE_CODE (type2) == TYPE_CODE_INT)
|
||
{
|
||
struct type *tmp = type1;
|
||
type1 = tmp;
|
||
tmp = type2;
|
||
inval1 = arg2;
|
||
inval2 = arg1;
|
||
}
|
||
else
|
||
{
|
||
inval1 = arg1;
|
||
inval2 = arg2;
|
||
}
|
||
|
||
/* Now process the input values. */
|
||
|
||
if (TYPE_CODE (type1) == TYPE_CODE_INT)
|
||
{
|
||
/* We have a repeat count. Validate the second value and then
|
||
construct a value repeated that many times. */
|
||
if (TYPE_CODE (type2) == TYPE_CODE_STRING
|
||
|| TYPE_CODE (type2) == TYPE_CODE_CHAR)
|
||
{
|
||
count = longest_to_int (value_as_long (inval1));
|
||
inval2len = TYPE_LENGTH (type2);
|
||
ptr = (char *) alloca (count * inval2len);
|
||
if (TYPE_CODE (type2) == TYPE_CODE_CHAR)
|
||
{
|
||
inchar = (char) unpack_long (type2,
|
||
value_contents (inval2));
|
||
for (idx = 0; idx < count; idx++)
|
||
{
|
||
*(ptr + idx) = inchar;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
for (idx = 0; idx < count; idx++)
|
||
{
|
||
memcpy (ptr + (idx * inval2len), value_contents (inval2),
|
||
inval2len);
|
||
}
|
||
}
|
||
outval = value_string (ptr, count * inval2len);
|
||
}
|
||
else if (TYPE_CODE (type2) == TYPE_CODE_BITSTRING
|
||
|| TYPE_CODE (type2) == TYPE_CODE_BOOL)
|
||
{
|
||
error (_("unimplemented support for bitstring/boolean repeats"));
|
||
}
|
||
else
|
||
{
|
||
error (_("can't repeat values of that type"));
|
||
}
|
||
}
|
||
else if (TYPE_CODE (type1) == TYPE_CODE_STRING
|
||
|| TYPE_CODE (type1) == TYPE_CODE_CHAR)
|
||
{
|
||
/* We have two character strings to concatenate. */
|
||
if (TYPE_CODE (type2) != TYPE_CODE_STRING
|
||
&& TYPE_CODE (type2) != TYPE_CODE_CHAR)
|
||
{
|
||
error (_("Strings can only be concatenated with other strings."));
|
||
}
|
||
inval1len = TYPE_LENGTH (type1);
|
||
inval2len = TYPE_LENGTH (type2);
|
||
ptr = (char *) alloca (inval1len + inval2len);
|
||
if (TYPE_CODE (type1) == TYPE_CODE_CHAR)
|
||
{
|
||
*ptr = (char) unpack_long (type1, value_contents (inval1));
|
||
}
|
||
else
|
||
{
|
||
memcpy (ptr, value_contents (inval1), inval1len);
|
||
}
|
||
if (TYPE_CODE (type2) == TYPE_CODE_CHAR)
|
||
{
|
||
*(ptr + inval1len) =
|
||
(char) unpack_long (type2, value_contents (inval2));
|
||
}
|
||
else
|
||
{
|
||
memcpy (ptr + inval1len, value_contents (inval2), inval2len);
|
||
}
|
||
outval = value_string (ptr, inval1len + inval2len);
|
||
}
|
||
else if (TYPE_CODE (type1) == TYPE_CODE_BITSTRING
|
||
|| TYPE_CODE (type1) == TYPE_CODE_BOOL)
|
||
{
|
||
/* We have two bitstrings to concatenate. */
|
||
if (TYPE_CODE (type2) != TYPE_CODE_BITSTRING
|
||
&& TYPE_CODE (type2) != TYPE_CODE_BOOL)
|
||
{
|
||
error (_("Bitstrings or booleans can only be concatenated with other bitstrings or booleans."));
|
||
}
|
||
error (_("unimplemented support for bitstring/boolean concatenation."));
|
||
}
|
||
else
|
||
{
|
||
/* We don't know how to concatenate these operands. */
|
||
error (_("illegal operands for concatenation."));
|
||
}
|
||
return (outval);
|
||
}
|
||
|
||
|
||
/* Obtain decimal value of arguments for binary operation, converting from
|
||
other types if one of them is not decimal floating point. */
|
||
static void
|
||
value_args_as_decimal (struct value *arg1, struct value *arg2,
|
||
gdb_byte *x, int *len_x, gdb_byte *y, int *len_y)
|
||
{
|
||
struct type *type1, *type2;
|
||
|
||
type1 = check_typedef (value_type (arg1));
|
||
type2 = check_typedef (value_type (arg2));
|
||
|
||
/* At least one of the arguments must be of decimal float type. */
|
||
gdb_assert (TYPE_CODE (type1) == TYPE_CODE_DECFLOAT
|
||
|| TYPE_CODE (type2) == TYPE_CODE_DECFLOAT);
|
||
|
||
if (TYPE_CODE (type1) == TYPE_CODE_FLT
|
||
|| TYPE_CODE (type2) == TYPE_CODE_FLT)
|
||
/* The DFP extension to the C language does not allow mixing of
|
||
* decimal float types with other float types in expressions
|
||
* (see WDTR 24732, page 12). */
|
||
error (_("Mixing decimal floating types with other floating types is not allowed."));
|
||
|
||
/* Obtain decimal value of arg1, converting from other types
|
||
if necessary. */
|
||
|
||
if (TYPE_CODE (type1) == TYPE_CODE_DECFLOAT)
|
||
{
|
||
*len_x = TYPE_LENGTH (type1);
|
||
memcpy (x, value_contents (arg1), *len_x);
|
||
}
|
||
else if (is_integral_type (type1))
|
||
{
|
||
*len_x = TYPE_LENGTH (type2);
|
||
decimal_from_integral (arg1, x, *len_x);
|
||
}
|
||
else
|
||
error (_("Don't know how to convert from %s to %s."), TYPE_NAME (type1),
|
||
TYPE_NAME (type2));
|
||
|
||
/* Obtain decimal value of arg2, converting from other types
|
||
if necessary. */
|
||
|
||
if (TYPE_CODE (type2) == TYPE_CODE_DECFLOAT)
|
||
{
|
||
*len_y = TYPE_LENGTH (type2);
|
||
memcpy (y, value_contents (arg2), *len_y);
|
||
}
|
||
else if (is_integral_type (type2))
|
||
{
|
||
*len_y = TYPE_LENGTH (type1);
|
||
decimal_from_integral (arg2, y, *len_y);
|
||
}
|
||
else
|
||
error (_("Don't know how to convert from %s to %s."), TYPE_NAME (type1),
|
||
TYPE_NAME (type2));
|
||
}
|
||
|
||
/* Perform a binary operation on two operands which have reasonable
|
||
representations as integers or floats. This includes booleans,
|
||
characters, integers, or floats.
|
||
Does not support addition and subtraction on pointers;
|
||
use value_add or value_sub if you want to handle those possibilities. */
|
||
|
||
struct value *
|
||
value_binop (struct value *arg1, struct value *arg2, enum exp_opcode op)
|
||
{
|
||
struct value *val;
|
||
struct type *type1, *type2;
|
||
|
||
arg1 = coerce_ref (arg1);
|
||
arg2 = coerce_ref (arg2);
|
||
type1 = check_typedef (value_type (arg1));
|
||
type2 = check_typedef (value_type (arg2));
|
||
|
||
if ((TYPE_CODE (type1) != TYPE_CODE_FLT
|
||
&& TYPE_CODE (type1) != TYPE_CODE_DECFLOAT && !is_integral_type (type1))
|
||
||
|
||
(TYPE_CODE (type2) != TYPE_CODE_FLT
|
||
&& TYPE_CODE (type2) != TYPE_CODE_DECFLOAT && !is_integral_type (type2)))
|
||
error (_("Argument to arithmetic operation not a number or boolean."));
|
||
|
||
if (TYPE_CODE (type1) == TYPE_CODE_DECFLOAT
|
||
||
|
||
TYPE_CODE (type2) == TYPE_CODE_DECFLOAT)
|
||
{
|
||
struct type *v_type;
|
||
int len_v1, len_v2, len_v;
|
||
gdb_byte v1[16], v2[16];
|
||
gdb_byte v[16];
|
||
|
||
value_args_as_decimal (arg1, arg2, v1, &len_v1, v2, &len_v2);
|
||
|
||
switch (op)
|
||
{
|
||
case BINOP_ADD:
|
||
case BINOP_SUB:
|
||
case BINOP_MUL:
|
||
case BINOP_DIV:
|
||
case BINOP_EXP:
|
||
decimal_binop (op, v1, len_v1, v2, len_v2, v, &len_v);
|
||
break;
|
||
|
||
default:
|
||
error (_("Operation not valid for decimal floating point number."));
|
||
}
|
||
|
||
if (TYPE_CODE (type1) != TYPE_CODE_DECFLOAT)
|
||
/* If arg1 is not a decimal float, the type of the result is the type
|
||
of the decimal float argument, arg2. */
|
||
v_type = type2;
|
||
else if (TYPE_CODE (type2) != TYPE_CODE_DECFLOAT)
|
||
/* Same logic, for the case where arg2 is not a decimal float. */
|
||
v_type = type1;
|
||
else
|
||
/* len_v is equal either to len_v1 or to len_v2. the type of the
|
||
result is the type of the argument with the same length as v. */
|
||
v_type = (len_v == len_v1)? type1 : type2;
|
||
|
||
val = value_from_decfloat (v_type, v);
|
||
}
|
||
else if (TYPE_CODE (type1) == TYPE_CODE_FLT
|
||
||
|
||
TYPE_CODE (type2) == TYPE_CODE_FLT)
|
||
{
|
||
/* FIXME-if-picky-about-floating-accuracy: Should be doing this
|
||
in target format. real.c in GCC probably has the necessary
|
||
code. */
|
||
DOUBLEST v1, v2, v = 0;
|
||
v1 = value_as_double (arg1);
|
||
v2 = value_as_double (arg2);
|
||
switch (op)
|
||
{
|
||
case BINOP_ADD:
|
||
v = v1 + v2;
|
||
break;
|
||
|
||
case BINOP_SUB:
|
||
v = v1 - v2;
|
||
break;
|
||
|
||
case BINOP_MUL:
|
||
v = v1 * v2;
|
||
break;
|
||
|
||
case BINOP_DIV:
|
||
v = v1 / v2;
|
||
break;
|
||
|
||
case BINOP_EXP:
|
||
errno = 0;
|
||
v = pow (v1, v2);
|
||
if (errno)
|
||
error (_("Cannot perform exponentiation: %s"), safe_strerror (errno));
|
||
break;
|
||
|
||
default:
|
||
error (_("Integer-only operation on floating point number."));
|
||
}
|
||
|
||
/* If either arg was long double, make sure that value is also long
|
||
double. */
|
||
|
||
if (TYPE_LENGTH (type1) * 8 > gdbarch_double_bit (current_gdbarch)
|
||
|| TYPE_LENGTH (type2) * 8 > gdbarch_double_bit (current_gdbarch))
|
||
val = allocate_value (builtin_type_long_double);
|
||
else
|
||
val = allocate_value (builtin_type_double);
|
||
|
||
store_typed_floating (value_contents_raw (val), value_type (val), v);
|
||
}
|
||
else if (TYPE_CODE (type1) == TYPE_CODE_BOOL
|
||
&&
|
||
TYPE_CODE (type2) == TYPE_CODE_BOOL)
|
||
{
|
||
LONGEST v1, v2, v = 0;
|
||
v1 = value_as_long (arg1);
|
||
v2 = value_as_long (arg2);
|
||
|
||
switch (op)
|
||
{
|
||
case BINOP_BITWISE_AND:
|
||
v = v1 & v2;
|
||
break;
|
||
|
||
case BINOP_BITWISE_IOR:
|
||
v = v1 | v2;
|
||
break;
|
||
|
||
case BINOP_BITWISE_XOR:
|
||
v = v1 ^ v2;
|
||
break;
|
||
|
||
case BINOP_EQUAL:
|
||
v = v1 == v2;
|
||
break;
|
||
|
||
case BINOP_NOTEQUAL:
|
||
v = v1 != v2;
|
||
break;
|
||
|
||
default:
|
||
error (_("Invalid operation on booleans."));
|
||
}
|
||
|
||
val = allocate_value (type1);
|
||
store_signed_integer (value_contents_raw (val),
|
||
TYPE_LENGTH (type1),
|
||
v);
|
||
}
|
||
else
|
||
/* Integral operations here. */
|
||
/* FIXME: Also mixed integral/booleans, with result an integer. */
|
||
/* FIXME: This implements ANSI C rules (also correct for C++).
|
||
What about FORTRAN and (the deleted) chill ? */
|
||
{
|
||
unsigned int promoted_len1 = TYPE_LENGTH (type1);
|
||
unsigned int promoted_len2 = TYPE_LENGTH (type2);
|
||
int is_unsigned1 = TYPE_UNSIGNED (type1);
|
||
int is_unsigned2 = TYPE_UNSIGNED (type2);
|
||
unsigned int result_len;
|
||
int unsigned_operation;
|
||
|
||
/* Determine type length and signedness after promotion for
|
||
both operands. */
|
||
if (promoted_len1 < TYPE_LENGTH (builtin_type_int))
|
||
{
|
||
is_unsigned1 = 0;
|
||
promoted_len1 = TYPE_LENGTH (builtin_type_int);
|
||
}
|
||
if (promoted_len2 < TYPE_LENGTH (builtin_type_int))
|
||
{
|
||
is_unsigned2 = 0;
|
||
promoted_len2 = TYPE_LENGTH (builtin_type_int);
|
||
}
|
||
|
||
/* Determine type length of the result, and if the operation should
|
||
be done unsigned.
|
||
Use the signedness of the operand with the greater length.
|
||
If both operands are of equal length, use unsigned operation
|
||
if one of the operands is unsigned. */
|
||
if (op == BINOP_RSH || op == BINOP_LSH)
|
||
{
|
||
/* In case of the shift operators the type of the result only
|
||
depends on the type of the left operand. */
|
||
unsigned_operation = is_unsigned1;
|
||
result_len = promoted_len1;
|
||
}
|
||
else if (promoted_len1 > promoted_len2)
|
||
{
|
||
unsigned_operation = is_unsigned1;
|
||
result_len = promoted_len1;
|
||
}
|
||
else if (promoted_len2 > promoted_len1)
|
||
{
|
||
unsigned_operation = is_unsigned2;
|
||
result_len = promoted_len2;
|
||
}
|
||
else
|
||
{
|
||
unsigned_operation = is_unsigned1 || is_unsigned2;
|
||
result_len = promoted_len1;
|
||
}
|
||
|
||
if (unsigned_operation)
|
||
{
|
||
ULONGEST v1, v2, v = 0;
|
||
v1 = (ULONGEST) value_as_long (arg1);
|
||
v2 = (ULONGEST) value_as_long (arg2);
|
||
|
||
/* Truncate values to the type length of the result. */
|
||
if (result_len < sizeof (ULONGEST))
|
||
{
|
||
v1 &= ((LONGEST) 1 << HOST_CHAR_BIT * result_len) - 1;
|
||
v2 &= ((LONGEST) 1 << HOST_CHAR_BIT * result_len) - 1;
|
||
}
|
||
|
||
switch (op)
|
||
{
|
||
case BINOP_ADD:
|
||
v = v1 + v2;
|
||
break;
|
||
|
||
case BINOP_SUB:
|
||
v = v1 - v2;
|
||
break;
|
||
|
||
case BINOP_MUL:
|
||
v = v1 * v2;
|
||
break;
|
||
|
||
case BINOP_DIV:
|
||
case BINOP_INTDIV:
|
||
if (v2 != 0)
|
||
v = v1 / v2;
|
||
else
|
||
error (_("Division by zero"));
|
||
break;
|
||
|
||
case BINOP_EXP:
|
||
errno = 0;
|
||
v = pow (v1, v2);
|
||
if (errno)
|
||
error (_("Cannot perform exponentiation: %s"), safe_strerror (errno));
|
||
break;
|
||
|
||
case BINOP_REM:
|
||
v = v1 % v2;
|
||
break;
|
||
|
||
case BINOP_MOD:
|
||
/* Knuth 1.2.4, integer only. Note that unlike the C '%' op,
|
||
v1 mod 0 has a defined value, v1. */
|
||
if (v2 == 0)
|
||
{
|
||
v = v1;
|
||
}
|
||
else
|
||
{
|
||
v = v1 / v2;
|
||
/* Note floor(v1/v2) == v1/v2 for unsigned. */
|
||
v = v1 - (v2 * v);
|
||
}
|
||
break;
|
||
|
||
case BINOP_LSH:
|
||
v = v1 << v2;
|
||
break;
|
||
|
||
case BINOP_RSH:
|
||
v = v1 >> v2;
|
||
break;
|
||
|
||
case BINOP_BITWISE_AND:
|
||
v = v1 & v2;
|
||
break;
|
||
|
||
case BINOP_BITWISE_IOR:
|
||
v = v1 | v2;
|
||
break;
|
||
|
||
case BINOP_BITWISE_XOR:
|
||
v = v1 ^ v2;
|
||
break;
|
||
|
||
case BINOP_LOGICAL_AND:
|
||
v = v1 && v2;
|
||
break;
|
||
|
||
case BINOP_LOGICAL_OR:
|
||
v = v1 || v2;
|
||
break;
|
||
|
||
case BINOP_MIN:
|
||
v = v1 < v2 ? v1 : v2;
|
||
break;
|
||
|
||
case BINOP_MAX:
|
||
v = v1 > v2 ? v1 : v2;
|
||
break;
|
||
|
||
case BINOP_EQUAL:
|
||
v = v1 == v2;
|
||
break;
|
||
|
||
case BINOP_NOTEQUAL:
|
||
v = v1 != v2;
|
||
break;
|
||
|
||
case BINOP_LESS:
|
||
v = v1 < v2;
|
||
break;
|
||
|
||
default:
|
||
error (_("Invalid binary operation on numbers."));
|
||
}
|
||
|
||
/* This is a kludge to get around the fact that we don't
|
||
know how to determine the result type from the types of
|
||
the operands. (I'm not really sure how much we feel the
|
||
need to duplicate the exact rules of the current
|
||
language. They can get really hairy. But not to do so
|
||
makes it hard to document just what we *do* do). */
|
||
|
||
/* Can't just call init_type because we wouldn't know what
|
||
name to give the type. */
|
||
val = allocate_value
|
||
(result_len > gdbarch_long_bit (current_gdbarch) / HOST_CHAR_BIT
|
||
? builtin_type_unsigned_long_long
|
||
: builtin_type_unsigned_long);
|
||
store_unsigned_integer (value_contents_raw (val),
|
||
TYPE_LENGTH (value_type (val)),
|
||
v);
|
||
}
|
||
else
|
||
{
|
||
LONGEST v1, v2, v = 0;
|
||
v1 = value_as_long (arg1);
|
||
v2 = value_as_long (arg2);
|
||
|
||
switch (op)
|
||
{
|
||
case BINOP_ADD:
|
||
v = v1 + v2;
|
||
break;
|
||
|
||
case BINOP_SUB:
|
||
v = v1 - v2;
|
||
break;
|
||
|
||
case BINOP_MUL:
|
||
v = v1 * v2;
|
||
break;
|
||
|
||
case BINOP_DIV:
|
||
case BINOP_INTDIV:
|
||
if (v2 != 0)
|
||
v = v1 / v2;
|
||
else
|
||
error (_("Division by zero"));
|
||
break;
|
||
|
||
case BINOP_EXP:
|
||
errno = 0;
|
||
v = pow (v1, v2);
|
||
if (errno)
|
||
error (_("Cannot perform exponentiation: %s"), safe_strerror (errno));
|
||
break;
|
||
|
||
case BINOP_REM:
|
||
if (v2 != 0)
|
||
v = v1 % v2;
|
||
else
|
||
error (_("Division by zero"));
|
||
break;
|
||
|
||
case BINOP_MOD:
|
||
/* Knuth 1.2.4, integer only. Note that unlike the C '%' op,
|
||
X mod 0 has a defined value, X. */
|
||
if (v2 == 0)
|
||
{
|
||
v = v1;
|
||
}
|
||
else
|
||
{
|
||
v = v1 / v2;
|
||
/* Compute floor. */
|
||
if (TRUNCATION_TOWARDS_ZERO && (v < 0) && ((v1 % v2) != 0))
|
||
{
|
||
v--;
|
||
}
|
||
v = v1 - (v2 * v);
|
||
}
|
||
break;
|
||
|
||
case BINOP_LSH:
|
||
v = v1 << v2;
|
||
break;
|
||
|
||
case BINOP_RSH:
|
||
v = v1 >> v2;
|
||
break;
|
||
|
||
case BINOP_BITWISE_AND:
|
||
v = v1 & v2;
|
||
break;
|
||
|
||
case BINOP_BITWISE_IOR:
|
||
v = v1 | v2;
|
||
break;
|
||
|
||
case BINOP_BITWISE_XOR:
|
||
v = v1 ^ v2;
|
||
break;
|
||
|
||
case BINOP_LOGICAL_AND:
|
||
v = v1 && v2;
|
||
break;
|
||
|
||
case BINOP_LOGICAL_OR:
|
||
v = v1 || v2;
|
||
break;
|
||
|
||
case BINOP_MIN:
|
||
v = v1 < v2 ? v1 : v2;
|
||
break;
|
||
|
||
case BINOP_MAX:
|
||
v = v1 > v2 ? v1 : v2;
|
||
break;
|
||
|
||
case BINOP_EQUAL:
|
||
v = v1 == v2;
|
||
break;
|
||
|
||
case BINOP_LESS:
|
||
v = v1 < v2;
|
||
break;
|
||
|
||
default:
|
||
error (_("Invalid binary operation on numbers."));
|
||
}
|
||
|
||
/* This is a kludge to get around the fact that we don't
|
||
know how to determine the result type from the types of
|
||
the operands. (I'm not really sure how much we feel the
|
||
need to duplicate the exact rules of the current
|
||
language. They can get really hairy. But not to do so
|
||
makes it hard to document just what we *do* do). */
|
||
|
||
/* Can't just call init_type because we wouldn't know what
|
||
name to give the type. */
|
||
val = allocate_value
|
||
(result_len > gdbarch_long_bit (current_gdbarch) / HOST_CHAR_BIT
|
||
? builtin_type_long_long
|
||
: builtin_type_long);
|
||
store_signed_integer (value_contents_raw (val),
|
||
TYPE_LENGTH (value_type (val)),
|
||
v);
|
||
}
|
||
}
|
||
|
||
return val;
|
||
}
|
||
|
||
/* Simulate the C operator ! -- return 1 if ARG1 contains zero. */
|
||
|
||
int
|
||
value_logical_not (struct value *arg1)
|
||
{
|
||
int len;
|
||
const gdb_byte *p;
|
||
struct type *type1;
|
||
|
||
arg1 = coerce_number (arg1);
|
||
type1 = check_typedef (value_type (arg1));
|
||
|
||
if (TYPE_CODE (type1) == TYPE_CODE_FLT)
|
||
return 0 == value_as_double (arg1);
|
||
else if (TYPE_CODE (type1) == TYPE_CODE_DECFLOAT)
|
||
return decimal_is_zero (value_contents (arg1), TYPE_LENGTH (type1));
|
||
|
||
len = TYPE_LENGTH (type1);
|
||
p = value_contents (arg1);
|
||
|
||
while (--len >= 0)
|
||
{
|
||
if (*p++)
|
||
break;
|
||
}
|
||
|
||
return len < 0;
|
||
}
|
||
|
||
/* Perform a comparison on two string values (whose content are not
|
||
necessarily null terminated) based on their length */
|
||
|
||
static int
|
||
value_strcmp (struct value *arg1, struct value *arg2)
|
||
{
|
||
int len1 = TYPE_LENGTH (value_type (arg1));
|
||
int len2 = TYPE_LENGTH (value_type (arg2));
|
||
const gdb_byte *s1 = value_contents (arg1);
|
||
const gdb_byte *s2 = value_contents (arg2);
|
||
int i, len = len1 < len2 ? len1 : len2;
|
||
|
||
for (i = 0; i < len; i++)
|
||
{
|
||
if (s1[i] < s2[i])
|
||
return -1;
|
||
else if (s1[i] > s2[i])
|
||
return 1;
|
||
else
|
||
continue;
|
||
}
|
||
|
||
if (len1 < len2)
|
||
return -1;
|
||
else if (len1 > len2)
|
||
return 1;
|
||
else
|
||
return 0;
|
||
}
|
||
|
||
/* Simulate the C operator == by returning a 1
|
||
iff ARG1 and ARG2 have equal contents. */
|
||
|
||
int
|
||
value_equal (struct value *arg1, struct value *arg2)
|
||
{
|
||
int len;
|
||
const gdb_byte *p1;
|
||
const gdb_byte *p2;
|
||
struct type *type1, *type2;
|
||
enum type_code code1;
|
||
enum type_code code2;
|
||
int is_int1, is_int2;
|
||
|
||
arg1 = coerce_array (arg1);
|
||
arg2 = coerce_array (arg2);
|
||
|
||
type1 = check_typedef (value_type (arg1));
|
||
type2 = check_typedef (value_type (arg2));
|
||
code1 = TYPE_CODE (type1);
|
||
code2 = TYPE_CODE (type2);
|
||
is_int1 = is_integral_type (type1);
|
||
is_int2 = is_integral_type (type2);
|
||
|
||
if (is_int1 && is_int2)
|
||
return longest_to_int (value_as_long (value_binop (arg1, arg2,
|
||
BINOP_EQUAL)));
|
||
else if ((code1 == TYPE_CODE_FLT || is_int1)
|
||
&& (code2 == TYPE_CODE_FLT || is_int2))
|
||
{
|
||
/* NOTE: kettenis/20050816: Avoid compiler bug on systems where
|
||
`long double' values are returned in static storage (m68k). */
|
||
DOUBLEST d = value_as_double (arg1);
|
||
return d == value_as_double (arg2);
|
||
}
|
||
else if ((code1 == TYPE_CODE_DECFLOAT || is_int1)
|
||
&& (code2 == TYPE_CODE_DECFLOAT || is_int2))
|
||
{
|
||
gdb_byte v1[16], v2[16];
|
||
int len_v1, len_v2;
|
||
|
||
value_args_as_decimal (arg1, arg2, v1, &len_v1, v2, &len_v2);
|
||
|
||
return decimal_compare (v1, len_v1, v2, len_v2) == 0;
|
||
}
|
||
|
||
/* FIXME: Need to promote to either CORE_ADDR or LONGEST, whichever
|
||
is bigger. */
|
||
else if (code1 == TYPE_CODE_PTR && is_int2)
|
||
return value_as_address (arg1) == (CORE_ADDR) value_as_long (arg2);
|
||
else if (code2 == TYPE_CODE_PTR && is_int1)
|
||
return (CORE_ADDR) value_as_long (arg1) == value_as_address (arg2);
|
||
|
||
else if (code1 == code2
|
||
&& ((len = (int) TYPE_LENGTH (type1))
|
||
== (int) TYPE_LENGTH (type2)))
|
||
{
|
||
p1 = value_contents (arg1);
|
||
p2 = value_contents (arg2);
|
||
while (--len >= 0)
|
||
{
|
||
if (*p1++ != *p2++)
|
||
break;
|
||
}
|
||
return len < 0;
|
||
}
|
||
else if (code1 == TYPE_CODE_STRING && code2 == TYPE_CODE_STRING)
|
||
{
|
||
return value_strcmp (arg1, arg2) == 0;
|
||
}
|
||
else
|
||
{
|
||
error (_("Invalid type combination in equality test."));
|
||
return 0; /* For lint -- never reached */
|
||
}
|
||
}
|
||
|
||
/* Simulate the C operator < by returning 1
|
||
iff ARG1's contents are less than ARG2's. */
|
||
|
||
int
|
||
value_less (struct value *arg1, struct value *arg2)
|
||
{
|
||
enum type_code code1;
|
||
enum type_code code2;
|
||
struct type *type1, *type2;
|
||
int is_int1, is_int2;
|
||
|
||
arg1 = coerce_array (arg1);
|
||
arg2 = coerce_array (arg2);
|
||
|
||
type1 = check_typedef (value_type (arg1));
|
||
type2 = check_typedef (value_type (arg2));
|
||
code1 = TYPE_CODE (type1);
|
||
code2 = TYPE_CODE (type2);
|
||
is_int1 = is_integral_type (type1);
|
||
is_int2 = is_integral_type (type2);
|
||
|
||
if (is_int1 && is_int2)
|
||
return longest_to_int (value_as_long (value_binop (arg1, arg2,
|
||
BINOP_LESS)));
|
||
else if ((code1 == TYPE_CODE_FLT || is_int1)
|
||
&& (code2 == TYPE_CODE_FLT || is_int2))
|
||
{
|
||
/* NOTE: kettenis/20050816: Avoid compiler bug on systems where
|
||
`long double' values are returned in static storage (m68k). */
|
||
DOUBLEST d = value_as_double (arg1);
|
||
return d < value_as_double (arg2);
|
||
}
|
||
else if ((code1 == TYPE_CODE_DECFLOAT || is_int1)
|
||
&& (code2 == TYPE_CODE_DECFLOAT || is_int2))
|
||
{
|
||
gdb_byte v1[16], v2[16];
|
||
int len_v1, len_v2;
|
||
|
||
value_args_as_decimal (arg1, arg2, v1, &len_v1, v2, &len_v2);
|
||
|
||
return decimal_compare (v1, len_v1, v2, len_v2) == -1;
|
||
}
|
||
else if (code1 == TYPE_CODE_PTR && code2 == TYPE_CODE_PTR)
|
||
return value_as_address (arg1) < value_as_address (arg2);
|
||
|
||
/* FIXME: Need to promote to either CORE_ADDR or LONGEST, whichever
|
||
is bigger. */
|
||
else if (code1 == TYPE_CODE_PTR && is_int2)
|
||
return value_as_address (arg1) < (CORE_ADDR) value_as_long (arg2);
|
||
else if (code2 == TYPE_CODE_PTR && is_int1)
|
||
return (CORE_ADDR) value_as_long (arg1) < value_as_address (arg2);
|
||
else if (code1 == TYPE_CODE_STRING && code2 == TYPE_CODE_STRING)
|
||
return value_strcmp (arg1, arg2) < 0;
|
||
else
|
||
{
|
||
error (_("Invalid type combination in ordering comparison."));
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
/* The unary operators +, - and ~. They free the argument ARG1. */
|
||
|
||
struct value *
|
||
value_pos (struct value *arg1)
|
||
{
|
||
struct type *type;
|
||
|
||
arg1 = coerce_ref (arg1);
|
||
|
||
type = check_typedef (value_type (arg1));
|
||
|
||
if (TYPE_CODE (type) == TYPE_CODE_FLT)
|
||
return value_from_double (type, value_as_double (arg1));
|
||
else if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
|
||
return value_from_decfloat (type, value_contents (arg1));
|
||
else if (is_integral_type (type))
|
||
{
|
||
/* Perform integral promotion for ANSI C/C++. FIXME: What about
|
||
FORTRAN and (the deleted) chill ? */
|
||
if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_int))
|
||
type = builtin_type_int;
|
||
|
||
return value_from_longest (type, value_as_long (arg1));
|
||
}
|
||
else
|
||
{
|
||
error ("Argument to positive operation not a number.");
|
||
return 0; /* For lint -- never reached */
|
||
}
|
||
}
|
||
|
||
struct value *
|
||
value_neg (struct value *arg1)
|
||
{
|
||
struct type *type;
|
||
struct type *result_type = value_type (arg1);
|
||
|
||
arg1 = coerce_ref (arg1);
|
||
|
||
type = check_typedef (value_type (arg1));
|
||
|
||
if (TYPE_CODE (type) == TYPE_CODE_DECFLOAT)
|
||
{
|
||
struct value *val = allocate_value (result_type);
|
||
int len = TYPE_LENGTH (type);
|
||
gdb_byte decbytes[16]; /* a decfloat is at most 128 bits long */
|
||
|
||
memcpy (decbytes, value_contents (arg1), len);
|
||
|
||
if (gdbarch_byte_order (current_gdbarch) == BFD_ENDIAN_LITTLE)
|
||
decbytes[len-1] = decbytes[len - 1] | 0x80;
|
||
else
|
||
decbytes[0] = decbytes[0] | 0x80;
|
||
|
||
memcpy (value_contents_raw (val), decbytes, len);
|
||
return val;
|
||
}
|
||
|
||
if (TYPE_CODE (type) == TYPE_CODE_FLT)
|
||
return value_from_double (result_type, -value_as_double (arg1));
|
||
else if (is_integral_type (type))
|
||
{
|
||
/* Perform integral promotion for ANSI C/C++. FIXME: What about
|
||
FORTRAN and (the deleted) chill ? */
|
||
if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_int))
|
||
result_type = builtin_type_int;
|
||
|
||
return value_from_longest (result_type, -value_as_long (arg1));
|
||
}
|
||
else
|
||
{
|
||
error (_("Argument to negate operation not a number."));
|
||
return 0; /* For lint -- never reached */
|
||
}
|
||
}
|
||
|
||
struct value *
|
||
value_complement (struct value *arg1)
|
||
{
|
||
struct type *type;
|
||
struct type *result_type = value_type (arg1);
|
||
|
||
arg1 = coerce_ref (arg1);
|
||
|
||
type = check_typedef (value_type (arg1));
|
||
|
||
if (!is_integral_type (type))
|
||
error (_("Argument to complement operation not an integer or boolean."));
|
||
|
||
/* Perform integral promotion for ANSI C/C++.
|
||
FIXME: What about FORTRAN ? */
|
||
if (TYPE_LENGTH (type) < TYPE_LENGTH (builtin_type_int))
|
||
result_type = builtin_type_int;
|
||
|
||
return value_from_longest (result_type, ~value_as_long (arg1));
|
||
}
|
||
|
||
/* The INDEX'th bit of SET value whose value_type is TYPE,
|
||
and whose value_contents is valaddr.
|
||
Return -1 if out of range, -2 other error. */
|
||
|
||
int
|
||
value_bit_index (struct type *type, const gdb_byte *valaddr, int index)
|
||
{
|
||
LONGEST low_bound, high_bound;
|
||
LONGEST word;
|
||
unsigned rel_index;
|
||
struct type *range = TYPE_FIELD_TYPE (type, 0);
|
||
if (get_discrete_bounds (range, &low_bound, &high_bound) < 0)
|
||
return -2;
|
||
if (index < low_bound || index > high_bound)
|
||
return -1;
|
||
rel_index = index - low_bound;
|
||
word = unpack_long (builtin_type_unsigned_char,
|
||
valaddr + (rel_index / TARGET_CHAR_BIT));
|
||
rel_index %= TARGET_CHAR_BIT;
|
||
if (gdbarch_bits_big_endian (current_gdbarch))
|
||
rel_index = TARGET_CHAR_BIT - 1 - rel_index;
|
||
return (word >> rel_index) & 1;
|
||
}
|
||
|
||
struct value *
|
||
value_in (struct value *element, struct value *set)
|
||
{
|
||
int member;
|
||
struct type *settype = check_typedef (value_type (set));
|
||
struct type *eltype = check_typedef (value_type (element));
|
||
if (TYPE_CODE (eltype) == TYPE_CODE_RANGE)
|
||
eltype = TYPE_TARGET_TYPE (eltype);
|
||
if (TYPE_CODE (settype) != TYPE_CODE_SET)
|
||
error (_("Second argument of 'IN' has wrong type"));
|
||
if (TYPE_CODE (eltype) != TYPE_CODE_INT
|
||
&& TYPE_CODE (eltype) != TYPE_CODE_CHAR
|
||
&& TYPE_CODE (eltype) != TYPE_CODE_ENUM
|
||
&& TYPE_CODE (eltype) != TYPE_CODE_BOOL)
|
||
error (_("First argument of 'IN' has wrong type"));
|
||
member = value_bit_index (settype, value_contents (set),
|
||
value_as_long (element));
|
||
if (member < 0)
|
||
error (_("First argument of 'IN' not in range"));
|
||
return value_from_longest (LA_BOOL_TYPE, member);
|
||
}
|
||
|
||
void
|
||
_initialize_valarith (void)
|
||
{
|
||
}
|