mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-11-29 04:53:56 +08:00
541 lines
14 KiB
C
541 lines
14 KiB
C
/* Perform arithmetic and other operations on values, for GDB.
|
||
Copyright (C) 1986 Free Software Foundation, Inc.
|
||
|
||
GDB is distributed in the hope that it will be useful, but WITHOUT ANY
|
||
WARRANTY. No author or distributor accepts responsibility to anyone
|
||
for the consequences of using it or for whether it serves any
|
||
particular purpose or works at all, unless he says so in writing.
|
||
Refer to the GDB General Public License for full details.
|
||
|
||
Everyone is granted permission to copy, modify and redistribute GDB,
|
||
but only under the conditions described in the GDB General Public
|
||
License. A copy of this license is supposed to have been given to you
|
||
along with GDB so you can know your rights and responsibilities. It
|
||
should be in a file named COPYING. Among other things, the copyright
|
||
notice and this notice must be preserved on all copies.
|
||
|
||
In other words, go ahead and share GDB, but don't try to stop
|
||
anyone else from sharing it farther. Help stamp out software hoarding!
|
||
*/
|
||
|
||
#include "defs.h"
|
||
#include "initialize.h"
|
||
#include "param.h"
|
||
#include "symtab.h"
|
||
#include "value.h"
|
||
#include "expression.h"
|
||
|
||
START_FILE
|
||
|
||
value value_x_binop ();
|
||
|
||
value
|
||
value_add (arg1, arg2)
|
||
value arg1, arg2;
|
||
{
|
||
register value val, valint, valptr;
|
||
register int len;
|
||
|
||
COERCE_ARRAY (arg1);
|
||
COERCE_ARRAY (arg2);
|
||
|
||
if ((TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_PTR
|
||
|| TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_PTR)
|
||
&&
|
||
(TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_INT
|
||
|| TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_INT))
|
||
/* Exactly one argument is a pointer, and one is an integer. */
|
||
{
|
||
if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_PTR)
|
||
{
|
||
valptr = arg1;
|
||
valint = arg2;
|
||
}
|
||
else
|
||
{
|
||
valptr = arg2;
|
||
valint = arg1;
|
||
}
|
||
len = TYPE_LENGTH (TYPE_TARGET_TYPE (VALUE_TYPE (valptr)));
|
||
if (len == 0) len = 1; /* For (void *) */
|
||
val = value_from_long (builtin_type_long,
|
||
value_as_long (valptr)
|
||
+ (len * value_as_long (valint)));
|
||
VALUE_TYPE (val) = VALUE_TYPE (valptr);
|
||
return val;
|
||
}
|
||
|
||
return value_binop (arg1, arg2, BINOP_ADD);
|
||
}
|
||
|
||
value
|
||
value_sub (arg1, arg2)
|
||
value arg1, arg2;
|
||
{
|
||
register value val;
|
||
|
||
COERCE_ARRAY (arg1);
|
||
COERCE_ARRAY (arg2);
|
||
|
||
if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_PTR
|
||
&&
|
||
TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_INT)
|
||
{
|
||
val = value_from_long (builtin_type_long,
|
||
value_as_long (arg1)
|
||
- TYPE_LENGTH (TYPE_TARGET_TYPE (VALUE_TYPE (arg1))) * value_as_long (arg2));
|
||
VALUE_TYPE (val) = VALUE_TYPE (arg1);
|
||
return val;
|
||
}
|
||
|
||
if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_PTR
|
||
&&
|
||
VALUE_TYPE (arg1) == VALUE_TYPE (arg2))
|
||
{
|
||
val = value_from_long (builtin_type_long,
|
||
(value_as_long (arg1) - value_as_long (arg2))
|
||
/ TYPE_LENGTH (TYPE_TARGET_TYPE (VALUE_TYPE (arg1))));
|
||
return val;
|
||
}
|
||
|
||
return value_binop (arg1, arg2, BINOP_SUB);
|
||
}
|
||
|
||
/* Return the value of ARRAY[IDX]. */
|
||
|
||
value
|
||
value_subscript (array, idx)
|
||
value array, idx;
|
||
{
|
||
return value_ind (value_add (array, idx));
|
||
}
|
||
|
||
/* Check to see if either argument is a structure. This is called so
|
||
we know whether to go ahead with the normal binop or look for a
|
||
user defined function instead.
|
||
|
||
For now, we do not overload the `=' operator. */
|
||
|
||
int
|
||
binop_user_defined_p (op, arg1, arg2)
|
||
enum exp_opcode op;
|
||
value arg1, arg2;
|
||
{
|
||
if (op == BINOP_ASSIGN)
|
||
return 0;
|
||
return (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_STRUCT
|
||
|| TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_STRUCT
|
||
|| (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_REF
|
||
&& TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (arg1))) == TYPE_CODE_STRUCT)
|
||
|| (TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_REF
|
||
&& TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (arg2))) == TYPE_CODE_STRUCT));
|
||
}
|
||
|
||
/* 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.
|
||
|
||
For now, we do not overload the `&' operator. */
|
||
|
||
int unop_user_defined_p (op, arg1)
|
||
enum exp_opcode op;
|
||
value arg1;
|
||
{
|
||
if (op == UNOP_ADDR)
|
||
return 0;
|
||
return (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_STRUCT
|
||
|| (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_REF
|
||
&& TYPE_CODE (TYPE_TARGET_TYPE (VALUE_TYPE (arg1))) == TYPE_CODE_STRUCT));
|
||
}
|
||
|
||
/* We know either arg1 or arg2 is a structure, so try to find the right
|
||
user defined function. Create an argument vector that calls
|
||
arg1.operator @ (arg1,arg2) and return that value (where '@' is any
|
||
binary operator which is legal for GNU C++). */
|
||
|
||
value
|
||
value_x_binop (arg1, arg2, op, otherop)
|
||
value arg1, arg2;
|
||
int op, otherop;
|
||
{
|
||
value * argvec;
|
||
char *ptr;
|
||
char tstr[13];
|
||
|
||
COERCE_ENUM (arg1);
|
||
COERCE_ENUM (arg2);
|
||
|
||
/* 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 (VALUE_TYPE (arg1)) != TYPE_CODE_STRUCT)
|
||
error ("friend functions not implemented yet");
|
||
|
||
argvec = (value *) alloca (sizeof (value) * 4);
|
||
argvec[1] = value_addr (arg1);
|
||
argvec[2] = arg2;
|
||
argvec[3] = 0;
|
||
|
||
/* make the right function name up */
|
||
strcpy(tstr, "operator __");
|
||
ptr = tstr+9;
|
||
switch (op)
|
||
{
|
||
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_LSH: strcpy(ptr,"<<"); break;
|
||
case BINOP_RSH: strcpy(ptr,">>"); break;
|
||
case BINOP_LOGAND: strcpy(ptr,"&"); break;
|
||
case BINOP_LOGIOR: strcpy(ptr,"|"); break;
|
||
case BINOP_LOGXOR: strcpy(ptr,"^"); break;
|
||
case BINOP_AND: strcpy(ptr,"&&"); break;
|
||
case BINOP_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_LOGAND: strcpy(ptr,"&="); break;
|
||
case BINOP_LOGIOR: strcpy(ptr,"|="); break;
|
||
case BINOP_LOGXOR: strcpy(ptr,"^="); break;
|
||
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;
|
||
default:
|
||
error ("Invalid binary operation specified.");
|
||
}
|
||
argvec[0] = value_struct_elt (arg1, argvec+1, tstr, "structure");
|
||
if (argvec[0])
|
||
return call_function (argvec[0], 2, argvec + 1);
|
||
else error ("member function %s not found", tstr);
|
||
}
|
||
|
||
/* 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++). */
|
||
|
||
value
|
||
value_x_unop (arg1, op)
|
||
value arg1;
|
||
int op;
|
||
{
|
||
value * argvec;
|
||
char *ptr;
|
||
char tstr[13];
|
||
|
||
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 (VALUE_TYPE (arg1)) != TYPE_CODE_STRUCT)
|
||
error ("friend functions not implemented yet");
|
||
|
||
argvec = (value *) alloca (sizeof (value) * 3);
|
||
argvec[1] = value_addr (arg1);
|
||
argvec[2] = 0;
|
||
|
||
/* make the right function name up */
|
||
strcpy(tstr,"operator __");
|
||
ptr = tstr+9;
|
||
switch (op)
|
||
{
|
||
case UNOP_PREINCREMENT: strcpy(ptr,"++"); break;
|
||
case UNOP_PREDECREMENT: strcpy(ptr,"++"); break;
|
||
case UNOP_POSTINCREMENT: strcpy(ptr,"++"); break;
|
||
case UNOP_POSTDECREMENT: strcpy(ptr,"++"); break;
|
||
case UNOP_ZEROP: strcpy(ptr,"!"); break;
|
||
case UNOP_LOGNOT: strcpy(ptr,"~"); break;
|
||
case UNOP_NEG: strcpy(ptr,"-"); break;
|
||
default:
|
||
error ("Invalid binary operation specified.");
|
||
}
|
||
argvec[0] = value_struct_elt (arg1, argvec+1, tstr, "structure");
|
||
if (argvec[0])
|
||
return call_function (argvec[0], 1, argvec + 1);
|
||
else error ("member function %s not found", tstr);
|
||
}
|
||
|
||
/* Perform a binary operation on two integers or two floats.
|
||
Does not support addition and subtraction on pointers;
|
||
use value_add or value_sub if you want to handle those possibilities. */
|
||
|
||
value
|
||
value_binop (arg1, arg2, op)
|
||
value arg1, arg2;
|
||
int op;
|
||
{
|
||
register value val;
|
||
|
||
COERCE_ENUM (arg1);
|
||
COERCE_ENUM (arg2);
|
||
|
||
if ((TYPE_CODE (VALUE_TYPE (arg1)) != TYPE_CODE_FLT
|
||
&&
|
||
TYPE_CODE (VALUE_TYPE (arg1)) != TYPE_CODE_INT)
|
||
||
|
||
(TYPE_CODE (VALUE_TYPE (arg2)) != TYPE_CODE_FLT
|
||
&&
|
||
TYPE_CODE (VALUE_TYPE (arg2)) != TYPE_CODE_INT))
|
||
error ("Argument to arithmetic operation not a number.");
|
||
|
||
if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_FLT
|
||
||
|
||
TYPE_CODE (VALUE_TYPE (arg2)) == TYPE_CODE_FLT)
|
||
{
|
||
double v1, v2, v;
|
||
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;
|
||
|
||
default:
|
||
error ("Integer-only operation on floating point number.");
|
||
}
|
||
|
||
val = allocate_value (builtin_type_double);
|
||
*(double *) VALUE_CONTENTS (val) = v;
|
||
}
|
||
else
|
||
{
|
||
long v1, v2, v;
|
||
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:
|
||
v = v1 / v2;
|
||
break;
|
||
|
||
case BINOP_REM:
|
||
v = v1 % v2;
|
||
break;
|
||
|
||
case BINOP_LSH:
|
||
v = v1 << v2;
|
||
break;
|
||
|
||
case BINOP_RSH:
|
||
v = v1 >> v2;
|
||
break;
|
||
|
||
case BINOP_LOGAND:
|
||
v = v1 & v2;
|
||
break;
|
||
|
||
case BINOP_LOGIOR:
|
||
v = v1 | v2;
|
||
break;
|
||
|
||
case BINOP_LOGXOR:
|
||
v = v1 ^ v2;
|
||
break;
|
||
|
||
case BINOP_AND:
|
||
v = v1 && v2;
|
||
break;
|
||
|
||
case BINOP_OR:
|
||
v = v1 || v2;
|
||
break;
|
||
|
||
case BINOP_MIN:
|
||
v = v1 < v2 ? v1 : v2;
|
||
break;
|
||
|
||
case BINOP_MAX:
|
||
v = v1 > v2 ? v1 : v2;
|
||
break;
|
||
|
||
default:
|
||
error ("Invalid binary operation on numbers.");
|
||
}
|
||
|
||
val = allocate_value (builtin_type_long);
|
||
*(long *) VALUE_CONTENTS (val) = v;
|
||
}
|
||
|
||
return val;
|
||
}
|
||
|
||
/* Simulate the C operator ! -- return 1 if ARG1 contains zeros. */
|
||
|
||
int
|
||
value_zerop (arg1)
|
||
value arg1;
|
||
{
|
||
register int len;
|
||
register char *p;
|
||
|
||
COERCE_ARRAY (arg1);
|
||
|
||
len = TYPE_LENGTH (VALUE_TYPE (arg1));
|
||
p = VALUE_CONTENTS (arg1);
|
||
|
||
while (--len >= 0)
|
||
{
|
||
if (*p++)
|
||
break;
|
||
}
|
||
|
||
return len < 0;
|
||
}
|
||
|
||
/* Simulate the C operator == by returning a 1
|
||
iff ARG1 and ARG2 have equal contents. */
|
||
|
||
int
|
||
value_equal (arg1, arg2)
|
||
register value arg1, arg2;
|
||
|
||
{
|
||
register int len;
|
||
register char *p1, *p2;
|
||
enum type_code code1;
|
||
enum type_code code2;
|
||
|
||
COERCE_ARRAY (arg1);
|
||
COERCE_ARRAY (arg2);
|
||
|
||
code1 = TYPE_CODE (VALUE_TYPE (arg1));
|
||
code2 = TYPE_CODE (VALUE_TYPE (arg2));
|
||
|
||
if (code1 == TYPE_CODE_INT && code2 == TYPE_CODE_INT)
|
||
return value_as_long (arg1) == value_as_long (arg2);
|
||
else if ((code1 == TYPE_CODE_FLT || code1 == TYPE_CODE_INT)
|
||
&& (code2 == TYPE_CODE_FLT || code2 == TYPE_CODE_INT))
|
||
return value_as_double (arg1) == value_as_double (arg2);
|
||
else if ((code1 == TYPE_CODE_PTR && code2 == TYPE_CODE_INT)
|
||
|| (code2 == TYPE_CODE_PTR && code1 == TYPE_CODE_INT))
|
||
return value_as_long (arg1) == value_as_long (arg2);
|
||
else if (code1 == code2
|
||
&& ((len = TYPE_LENGTH (VALUE_TYPE (arg1)))
|
||
== TYPE_LENGTH (VALUE_TYPE (arg2))))
|
||
{
|
||
p1 = VALUE_CONTENTS (arg1);
|
||
p2 = VALUE_CONTENTS (arg2);
|
||
while (--len >= 0)
|
||
{
|
||
if (*p1++ != *p2++)
|
||
break;
|
||
}
|
||
return len < 0;
|
||
}
|
||
else
|
||
error ("Invalid type combination in equality test.");
|
||
}
|
||
|
||
/* Simulate the C operator < by returning 1
|
||
iff ARG1's contents are less than ARG2's. */
|
||
|
||
int
|
||
value_less (arg1, arg2)
|
||
register value arg1, arg2;
|
||
{
|
||
register enum type_code code1;
|
||
register enum type_code code2;
|
||
|
||
COERCE_ARRAY (arg1);
|
||
COERCE_ARRAY (arg2);
|
||
|
||
code1 = TYPE_CODE (VALUE_TYPE (arg1));
|
||
code2 = TYPE_CODE (VALUE_TYPE (arg2));
|
||
|
||
if (code1 == TYPE_CODE_INT && code2 == TYPE_CODE_INT)
|
||
return value_as_long (arg1) < value_as_long (arg2);
|
||
else if ((code1 == TYPE_CODE_FLT || code1 == TYPE_CODE_INT)
|
||
&& (code2 == TYPE_CODE_FLT || code2 == TYPE_CODE_INT))
|
||
return value_as_double (arg1) < value_as_double (arg2);
|
||
else if ((code1 == TYPE_CODE_PTR || code1 == TYPE_CODE_INT)
|
||
&& (code2 == TYPE_CODE_PTR || code2 == TYPE_CODE_INT))
|
||
return value_as_long (arg1) < value_as_long (arg2);
|
||
else
|
||
error ("Invalid type combination in ordering comparison.");
|
||
}
|
||
|
||
/* The unary operators - and ~. Both free the argument ARG1. */
|
||
|
||
value
|
||
value_neg (arg1)
|
||
register value arg1;
|
||
{
|
||
register struct type *type;
|
||
|
||
COERCE_ENUM (arg1);
|
||
|
||
type = 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_INT)
|
||
return value_from_long (type, - value_as_long (arg1));
|
||
else
|
||
error ("Argument to negate operation not a number.");
|
||
}
|
||
|
||
value
|
||
value_lognot (arg1)
|
||
register value arg1;
|
||
{
|
||
COERCE_ENUM (arg1);
|
||
|
||
if (TYPE_CODE (VALUE_TYPE (arg1)) != TYPE_CODE_INT)
|
||
error ("Argument to complement operation not an integer.");
|
||
|
||
return value_from_long (VALUE_TYPE (arg1), ~ value_as_long (arg1));
|
||
}
|
||
|
||
static
|
||
initialize ()
|
||
{
|
||
}
|
||
|
||
END_FILE
|