/* Perform arithmetic and other operations on values, for GDB.
+
Copyright 1986, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995,
- 1996, 1997, 1998, 1999, 2000, 2001, 2002
- Free Software Foundation, Inc.
+ 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 Free Software
+ Foundation, Inc.
This file is part of GDB.
#include "gdb_string.h"
#include "doublest.h"
#include <math.h>
+#include "infcall.h"
/* Define whether or not the C operator '/' truncates towards zero for
differently signed operands (truncation direction is undefined in C). */
void _initialize_valarith (void);
\f
+/* Given a pointer, return the size of its target.
+ If the pointer type is void *, then return 1.
+ If the target type is incomplete, then error out.
+ This isn't a general purpose function, but just a
+ helper for value_sub & value_add.
+*/
+
+static LONGEST
+find_size_for_pointer_math (struct type *ptr_type)
+{
+ LONGEST sz = -1;
+ struct type *ptr_target;
+
+ ptr_target = check_typedef (TYPE_TARGET_TYPE (ptr_type));
+
+ sz = TYPE_LENGTH (ptr_target);
+ if (sz == 0)
+ {
+ if (TYPE_CODE (ptr_type) == TYPE_CODE_VOID)
+ sz = 1;
+ else
+ {
+ char *name;
+
+ name = TYPE_NAME (ptr_target);
+ if (name == NULL)
+ name = TYPE_TAG_NAME (ptr_target);
+ if (name == NULL)
+ error ("Cannot perform pointer math on incomplete types, "
+ "try casting to a known type, or void *.");
+ else
+ error ("Cannot perform pointer math on incomplete type \"%s\", "
+ "try casting to a known type, or void *.", name);
+ }
+ }
+ return sz;
+}
+
struct value *
value_add (struct value *arg1, struct value *arg2)
{
struct value *valint;
struct value *valptr;
- register int len;
+ LONGEST sz;
struct type *type1, *type2, *valptrtype;
COERCE_NUMBER (arg1);
valint = arg1;
valptrtype = type2;
}
- len = TYPE_LENGTH (check_typedef (TYPE_TARGET_TYPE (valptrtype)));
- if (len == 0)
- len = 1; /* For (void *) */
+
+ sz = find_size_for_pointer_math (valptrtype);
+
retval = value_from_pointer (valptrtype,
value_as_address (valptr)
- + (len * value_as_long (valint)));
+ + (sz * value_as_long (valint)));
VALUE_BFD_SECTION (retval) = VALUE_BFD_SECTION (valptr);
return retval;
}
if (TYPE_CODE (type2) == TYPE_CODE_INT)
{
/* pointer - integer. */
- LONGEST sz = TYPE_LENGTH (check_typedef (TYPE_TARGET_TYPE (type1)));
+ LONGEST sz = find_size_for_pointer_math (type1);
+
return value_from_pointer (type1,
(value_as_address (arg1)
- (sz * value_as_long (arg2))));
else
VALUE_LVAL (v) = VALUE_LVAL (array);
VALUE_ADDRESS (v) = VALUE_ADDRESS (array);
+ VALUE_REGNO (v) = VALUE_REGNO (array);
VALUE_OFFSET (v) = VALUE_OFFSET (array) + elt_offs;
return v;
}
struct value **argvec;
char *ptr, *mangle_ptr;
char tstr[13], mangle_tstr[13];
- int static_memfuncp;
+ int static_memfuncp, nargs;
COERCE_REF (arg1);
COERCE_ENUM (arg1);
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 *) * 3);
+ 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 (ptr, "++");
break;
case UNOP_PREDECREMENT:
- strcpy (ptr, "++");
+ 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, "++");
+ strcpy (ptr, "--");
+ argvec[2] = value_from_longest (builtin_type_int, 0);
+ argvec[3] = 0;
+ nargs ++;
break;
case UNOP_LOGICAL_NOT:
strcpy (ptr, "!");
if (static_memfuncp)
{
argvec[1] = argvec[0];
+ nargs --;
argvec++;
}
if (noside == EVAL_AVOID_SIDE_EFFECTS)
= TYPE_TARGET_TYPE (check_typedef (VALUE_TYPE (argvec[0])));
return value_zero (return_type, VALUE_LVAL (arg1));
}
- return call_function_by_hand (argvec[0], 1 - static_memfuncp, argvec + 1);
+ return call_function_by_hand (argvec[0], nargs, argvec + 1);
}
error ("member function %s not found", tstr);
return 0; /* For lint -- never reached */
case BINOP_EXP:
v = pow (v1, v2);
if (errno)
- error ("Cannot perform exponentiation: %s", strerror (errno));
+ error ("Cannot perform exponentiation: %s", safe_strerror (errno));
break;
default:
/* 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 chill? */
+ What about FORTRAN and (the deleted) chill ? */
{
unsigned int promoted_len1 = TYPE_LENGTH (type1);
unsigned int promoted_len2 = TYPE_LENGTH (type2);
case BINOP_EXP:
v = pow (v1, v2);
if (errno)
- error ("Cannot perform exponentiation: %s", strerror (errno));
+ error ("Cannot perform exponentiation: %s", safe_strerror (errno));
break;
case BINOP_REM:
case BINOP_MOD:
/* Knuth 1.2.4, integer only. Note that unlike the C '%' op,
v1 mod 0 has a defined value, v1. */
- /* Chill specifies that v2 must be > 0, so check for that. */
- if (current_language->la_language == language_chill
- && value_as_long (arg2) <= 0)
- {
- error ("Second operand of MOD must be greater than zero.");
- }
if (v2 == 0)
{
v = v1;
case BINOP_EXP:
v = pow (v1, v2);
if (errno)
- error ("Cannot perform exponentiation: %s", strerror (errno));
+ error ("Cannot perform exponentiation: %s", safe_strerror (errno));
break;
case BINOP_REM:
case BINOP_MOD:
/* Knuth 1.2.4, integer only. Note that unlike the C '%' op,
X mod 0 has a defined value, X. */
- /* Chill specifies that v2 must be > 0, so check for that. */
- if (current_language->la_language == language_chill
- && v2 <= 0)
- {
- error ("Second operand of MOD must be greater than zero.");
- }
if (v2 == 0)
{
v = v1;
return value_from_double (result_type, -value_as_double (arg1));
else if (TYPE_CODE (type) == TYPE_CODE_INT || TYPE_CODE (type) == TYPE_CODE_BOOL)
{
- /* Perform integral promotion for ANSI C/C++.
- FIXME: What about FORTRAN and chill ? */
+ /* 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;