mirror of
https://github.com/darlinghq/darling-gdb.git
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366 lines
8.2 KiB
C
366 lines
8.2 KiB
C
/* Perform arithmetic and other operations on values, for GDB.
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Copyright (C) 1986 Free Software Foundation, Inc.
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GDB is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY. No author or distributor accepts responsibility to anyone
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for the consequences of using it or for whether it serves any
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particular purpose or works at all, unless he says so in writing.
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Refer to the GDB General Public License for full details.
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Everyone is granted permission to copy, modify and redistribute GDB,
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but only under the conditions described in the GDB General Public
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License. A copy of this license is supposed to have been given to you
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along with GDB so you can know your rights and responsibilities. It
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should be in a file named COPYING. Among other things, the copyright
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notice and this notice must be preserved on all copies.
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In other words, go ahead and share GDB, but don't try to stop
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anyone else from sharing it farther. Help stamp out software hoarding!
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*/
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#include "defs.h"
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#include "initialize.h"
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#include "param.h"
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#include "symtab.h"
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#include "value.h"
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#include "expression.h"
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START_FILE
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value
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value_add (arg1, arg2)
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value arg1, arg2;
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{
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register value val, valint, valptr;
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register int len;
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COERCE_ARRAY (arg1);
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COERCE_ARRAY (arg2);
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if ((TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_PTR
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|| TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_PTR)
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&&
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(TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_INT
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|| TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_INT))
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/* Exactly one argument is a pointer, and one is an integer. */
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{
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if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_PTR)
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{
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valptr = arg1;
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valint = arg2;
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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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}
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len = TYPE_LENGTH (TYPE_TARGET_TYPE (VALUE_TYPE (valptr)));
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if (len == 0) len = 1; /* For (void *) */
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val = value_from_long (builtin_type_long,
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value_as_long (valptr)
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+ (len * value_as_long (valint)));
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VALUE_TYPE (val) = VALUE_TYPE (valptr);
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return val;
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}
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return value_binop (arg1, arg2, BINOP_ADD);
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}
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value
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value_sub (arg1, arg2)
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value arg1, arg2;
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{
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register value val;
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COERCE_ARRAY (arg1);
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COERCE_ARRAY (arg2);
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if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_PTR
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&&
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TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_INT)
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{
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val = value_from_long (builtin_type_long,
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value_as_long (arg1)
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- TYPE_LENGTH (TYPE_TARGET_TYPE (VALUE_TYPE (arg1))) * value_as_long (arg2));
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VALUE_TYPE (val) = VALUE_TYPE (arg1);
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return val;
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}
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if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_PTR
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&&
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VALUE_TYPE (arg1) == VALUE_TYPE (arg2))
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{
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val = value_from_long (builtin_type_long,
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(value_as_long (arg1) - value_as_long (arg2))
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/ TYPE_LENGTH (TYPE_TARGET_TYPE (VALUE_TYPE (arg1))));
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return val;
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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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value
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value_subscript (array, idx)
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value array, idx;
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{
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return value_ind (value_add (array, idx));
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}
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/* Perform a binary operation on two integers or two floats.
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Does not support addition and subtraction on pointers;
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use value_add or value_sub if you want to handle those possibilities. */
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value
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value_binop (arg1, arg2, op)
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value arg1, arg2;
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int op;
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{
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register value val;
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COERCE_ENUM (arg1);
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COERCE_ENUM (arg2);
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if ((TYPE_CODE (VALUE_TYPE (arg1)) != TYPE_CODE_FLT
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&&
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TYPE_CODE (VALUE_TYPE (arg1)) != TYPE_CODE_INT)
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(TYPE_CODE (VALUE_TYPE (arg2)) != TYPE_CODE_FLT
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&&
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TYPE_CODE (VALUE_TYPE (arg2)) != TYPE_CODE_INT))
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error ("Argument to arithmetic operation not a number.");
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if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_FLT
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TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_FLT)
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{
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double v1, v2, v;
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v1 = value_as_double (arg1);
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v2 = value_as_double (arg2);
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switch (op)
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{
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case BINOP_ADD:
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v = v1 + v2;
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break;
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case BINOP_SUB:
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v = v1 - v2;
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break;
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case BINOP_MUL:
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v = v1 * v2;
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break;
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case BINOP_DIV:
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v = v1 / v2;
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break;
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default:
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error ("Integer-only operation on floating point number.");
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}
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val = allocate_value (builtin_type_double);
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*(double *) VALUE_CONTENTS (val) = v;
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}
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else
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{
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long v1, v2, v;
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v1 = value_as_long (arg1);
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v2 = value_as_long (arg2);
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switch (op)
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{
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case BINOP_ADD:
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v = v1 + v2;
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break;
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case BINOP_SUB:
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v = v1 - v2;
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break;
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case BINOP_MUL:
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v = v1 * v2;
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break;
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case BINOP_DIV:
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v = v1 / v2;
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break;
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case BINOP_REM:
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v = v1 % v2;
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break;
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case BINOP_LSH:
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v = v1 << v2;
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break;
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case BINOP_RSH:
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v = v1 >> v2;
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break;
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case BINOP_LOGAND:
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v = v1 & v2;
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break;
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case BINOP_LOGIOR:
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v = v1 | v2;
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break;
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case BINOP_LOGXOR:
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v = v1 ^ v2;
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break;
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case BINOP_AND:
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v = v1 && v2;
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break;
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case BINOP_OR:
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v = v1 || v2;
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break;
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default:
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error ("Invalid binary operation on numbers.");
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}
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val = allocate_value (builtin_type_long);
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*(long *) VALUE_CONTENTS (val) = v;
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}
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return val;
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}
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/* Simulate the C operator ! -- return 1 if ARG1 contains zeros. */
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int
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value_zerop (arg1)
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value arg1;
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{
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register int len;
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register char *p;
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COERCE_ARRAY (arg1);
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len = TYPE_LENGTH (VALUE_TYPE (arg1));
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p = VALUE_CONTENTS (arg1);
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while (--len >= 0)
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{
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if (*p++)
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break;
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}
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return len < 0;
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}
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/* Simulate the C operator == by returning a 1
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iff ARG1 and ARG2 have equal contents. */
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int
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value_equal (arg1, arg2)
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register value arg1, arg2;
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{
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register int len;
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register char *p1, *p2;
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enum type_code code1;
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enum type_code code2;
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COERCE_ARRAY (arg1);
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COERCE_ARRAY (arg2);
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code1 = TYPE_CODE (VALUE_TYPE (arg1));
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code2 = TYPE_CODE (VALUE_TYPE (arg2));
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if (code1 == TYPE_CODE_INT && code2 == TYPE_CODE_INT)
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return value_as_long (arg1) == value_as_long (arg2);
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else if ((code1 == TYPE_CODE_FLT || code1 == TYPE_CODE_INT)
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&& (code2 == TYPE_CODE_FLT || code2 == TYPE_CODE_INT))
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return value_as_double (arg1) == value_as_double (arg2);
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else if ((code1 == TYPE_CODE_PTR && code2 == TYPE_CODE_INT)
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|| (code2 == TYPE_CODE_PTR && code1 == TYPE_CODE_INT))
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return value_as_long (arg1) == value_as_long (arg2);
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else if (code1 == code2
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&& ((len = TYPE_LENGTH (VALUE_TYPE (arg1)))
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== TYPE_LENGTH (VALUE_TYPE (arg2))))
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{
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p1 = VALUE_CONTENTS (arg1);
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p2 = VALUE_CONTENTS (arg2);
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while (--len >= 0)
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{
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if (*p1++ != *p2++)
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break;
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}
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return len < 0;
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}
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else
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error ("Invalid type combination in equality test.");
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}
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/* Simulate the C operator < by returning 1
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iff ARG1's contents are less than ARG2's. */
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int
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value_less (arg1, arg2)
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register value arg1, arg2;
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{
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register enum type_code code1;
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register enum type_code code2;
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COERCE_ARRAY (arg1);
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COERCE_ARRAY (arg2);
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code1 = TYPE_CODE (VALUE_TYPE (arg1));
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code2 = TYPE_CODE (VALUE_TYPE (arg2));
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if (code1 == TYPE_CODE_INT && code2 == TYPE_CODE_INT)
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return value_as_long (arg1) < value_as_long (arg2);
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else if ((code1 == TYPE_CODE_FLT || code1 == TYPE_CODE_INT)
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&& (code2 == TYPE_CODE_FLT || code2 == TYPE_CODE_INT))
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return value_as_double (arg1) < value_as_double (arg2);
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else if ((code1 == TYPE_CODE_PTR || code1 == TYPE_CODE_INT)
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&& (code2 == TYPE_CODE_PTR || code2 == TYPE_CODE_INT))
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return value_as_long (arg1) < value_as_long (arg2);
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else
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error ("Invalid type combination in ordering comparison.");
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}
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/* The unary operators - and ~. Both free the argument ARG1. */
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value
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value_neg (arg1)
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register value arg1;
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{
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register struct type *type;
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COERCE_ENUM (arg1);
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type = VALUE_TYPE (arg1);
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if (TYPE_CODE (type) == TYPE_CODE_FLT)
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return value_from_double (type, - value_as_double (arg1));
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else if (TYPE_CODE (type) == TYPE_CODE_INT)
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return value_from_long (type, - value_as_long (arg1));
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else
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error ("Argument to negate operation not a number.");
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}
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value
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value_lognot (arg1)
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register value arg1;
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{
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COERCE_ENUM (arg1);
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if (TYPE_CODE (VALUE_TYPE (arg1)) != TYPE_CODE_INT)
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error ("Argument to complement operation not an integer.");
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return value_from_long (VALUE_TYPE (arg1), ~ value_as_long (arg1));
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}
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static
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initialize ()
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{
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}
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END_FILE
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